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<div class="title">tcp_in.c</div> </div>
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<a href="../../de/d6d/tcp__in_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>  </div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * Copyright (c) 2001-2004 Swedish Institute of Computer Science.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * All rights reserved.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * Redistribution and use in source and binary forms, with or without modification,</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * are permitted provided that the following conditions are met:</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * 1. Redistributions of source code must retain the above copyright notice,</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright notice,</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * this list of conditions and the following disclaimer in the documentation</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * and/or other materials provided with the distribution.</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * 3. The name of the author may not be used to endorse or promote products</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * derived from this software without specific prior written permission.</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> * OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> * This file is part of the lwIP TCP/IP stack.</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment"> * Author: Adam Dunkels <adam@sics.se></span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  </div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#include "<a class="code" href="../../dc/dba/opt_8h.html">net/opt.h</a>"</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  </div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="preprocessor">#if LWIP_TCP </span><span class="comment">/* don't build if not configured for use in lwipopts.h */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  </div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#include "<a class="code" href="../../da/d54/tcp__priv_8h.html">net/priv/tcp_priv.h</a>"</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor">#include "<a class="code" href="../../d4/da4/def_8h.html">net/def.h</a>"</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="preprocessor">#include "<a class="code" href="../../de/df7/ip__addr_8h.html">net/ip_addr.h</a>"</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="preprocessor">#include "<a class="code" href="../../d9/d69/netif_8h.html">net/netif.h</a>"</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor">#include "<a class="code" href="../../d9/d9a/mem_8h.html">net/mem.h</a>"</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor">#include "<a class="code" href="../../df/dff/memp_8h.html">net/memp.h</a>"</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="preprocessor">#include "<a class="code" href="../../d2/d45/inet__chksum_8h.html">net/inet_chksum.h</a>"</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="preprocessor">#include "<a class="code" href="../../d9/d9b/stats_8h.html">net/stats.h</a>"</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor">#include "<a class="code" href="../../d0/dca/ip6_8h.html">net/ip6.h</a>"</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor">#include "<a class="code" href="../../d3/d7d/ip6__addr_8h.html">net/ip6_addr.h</a>"</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="preprocessor">#if LWIP_ND6_TCP_REACHABILITY_HINTS</span></div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor">#include "<a class="code" href="../../d9/d56/nd6_8h.html">net/nd6.h</a>"</span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_ND6_TCP_REACHABILITY_HINTS */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  </div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="preprocessor">#define LWIP_TCP_CALC_INITIAL_CWND(mss) LWIP_MIN((4U * (mss)), LWIP_MAX((2U * (mss)), 4380U));</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  </div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment">/* These variables are global to all functions involved in the input</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> processing of TCP segments. They are set by the tcp_input()</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> function. */</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="keyword">static</span> <span class="keyword">struct </span>tcp_seg inseg;</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="../../db/df4/structtcp__hdr.html">tcp_hdr</a> *tcphdr;</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="keyword">static</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> tcphdr_optlen;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="keyword">static</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> tcphdr_opt1len;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="keyword">static</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>* tcphdr_opt2;</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="keyword">static</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> tcp_optidx;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span> <span class="keyword">static</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> seqno, ackno;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span> <span class="keyword">static</span> tcpwnd_size_t recv_acked;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span> <span class="keyword">static</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> tcplen;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="keyword">static</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> flags;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  </div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="keyword">static</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> recv_flags;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *recv_data;</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  </div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="keyword">struct </span>tcp_pcb *tcp_input_pcb;</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  </div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="comment">/* Forward declarations. */</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="keyword">static</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> tcp_process(<span class="keyword">struct</span> tcp_pcb *pcb);</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> <span class="keyword">static</span> <span class="keywordtype">void</span> tcp_receive(<span class="keyword">struct</span> tcp_pcb *pcb);</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="keyword">static</span> <span class="keywordtype">void</span> tcp_parseopt(<span class="keyword">struct</span> tcp_pcb *pcb);</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  </div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span> <span class="keyword">static</span> <span class="keywordtype">void</span> tcp_listen_input(<span class="keyword">struct</span> tcp_pcb_listen *pcb);</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="keyword">static</span> <span class="keywordtype">void</span> tcp_timewait_input(<span class="keyword">struct</span> tcp_pcb *pcb);</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  </div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="keyword">static</span> <span class="keywordtype">int</span> tcp_input_delayed_close(<span class="keyword">struct</span> tcp_pcb *pcb);</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  </div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span> tcp_input(<span class="keyword">struct</span> <a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p, <span class="keyword">struct</span> <a class="code" href="../../d2/dd6/structnetif.html">netif</a> *inp)</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> {</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keyword">struct </span>tcp_pcb *pcb, *prev;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keyword">struct </span>tcp_pcb_listen *lpcb;</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> <span class="preprocessor">#if SO_REUSE</span></div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keyword">struct </span>tcp_pcb *lpcb_prev = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keyword">struct </span>tcp_pcb_listen *lpcb_any = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span> <span class="preprocessor">#endif </span><span class="comment">/* SO_REUSE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> hdrlen_bytes;</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err;</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  </div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga70624a5deb8b9199406372a7f3603ecf">LWIP_UNUSED_ARG</a>(inp);</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  </div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <a class="code" href="../../d1/d3b/perf_8h.html#aa1d6977095e51331f65dcfb2b076da52">PERF_START</a>;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  </div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.recv);</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a237a8f1e47af42fb612e936e928a9ced">MIB2_STATS_INC</a>(mib2.tcpinsegs);</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  </div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  tcphdr = (<span class="keyword">struct </span><a class="code" href="../../db/df4/structtcp__hdr.html">tcp_hdr</a> *)p-><a class="code" href="../../d9/db8/structpbuf.html#a8d32dc3e964369d4eec638fc37fbc460">payload</a>;</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  </div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span> #<span class="keywordflow">if</span> <a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a></div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  tcp_debug_print(tcphdr);</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  </div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="comment">/* Check that TCP header fits in payload */</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordflow">if</span> (p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> < <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5758db371d6daa394d178429b7c94c2a">TCP_HLEN</a>) {</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="comment">/* drop short packets */</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_input: short packet (%"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" bytes) discarded\n"</span>, p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a>));</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.lenerr);</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keywordflow">goto</span> dropped;</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  }</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  </div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="comment">/* Don't even process incoming broadcasts/multicasts. */</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordflow">if</span> (<a class="code" href="../../de/df7/ip__addr_8h.html#a11275b39f9b8e876e8124a16410e8840">ip_addr_isbroadcast</a>(<a class="code" href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a>(), <a class="code" href="../../da/d2f/ip_8h.html#aabecef3c7653a9767c79245c44fcab9f">ip_current_netif</a>()) ||</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <a class="code" href="../../de/df7/ip__addr_8h.html#a2170d3ee13dd22722222228e7b1c5752">ip_addr_ismulticast</a>(<a class="code" href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a>())) {</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.proterr);</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="keywordflow">goto</span> dropped;</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  }</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  </div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span> <span class="preprocessor">#if CHECKSUM_CHECK_TCP</span></div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <a class="code" href="../../d9/d69/netif_8h.html#ad968df1b35c2fae368e087966e3bc677">IF__NETIF_CHECKSUM_ENABLED</a>(inp, NETIF_CHECKSUM_CHECK_TCP) {</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="comment">/* Verify TCP checksum. */</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> chksum = <a class="code" href="../../d2/d45/inet__chksum_8h.html#aa13cda42e7c262f5dee243ff6c28422f">ip_chksum_pseudo</a>(p, <a class="code" href="../../d4/d19/prot_2ip_8h.html#a634284ee3a136d6ad61bc5d917ebb82f">IP_PROTO_TCP</a>, p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a>,</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <a class="code" href="../../da/d2f/ip_8h.html#a4e35b7692c228c98e738892f0a215647">ip_current_src_addr</a>(), <a class="code" href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a>());</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="keywordflow">if</span> (chksum != 0) {</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_input: packet discarded due to failing checksum 0x%04"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga1418f92673e54a36b6e376109e526382">X16_F</a><span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  chksum));</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  tcp_debug_print(tcphdr);</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.chkerr);</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  <span class="keywordflow">goto</span> dropped;</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  }</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  }</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> <span class="preprocessor">#endif </span><span class="comment">/* CHECKSUM_CHECK_TCP */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  </div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>  <span class="comment">/* sanity-check header length */</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  hdrlen_bytes = <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5b97d3b7e68c20eb3eab87a61d779223">TCPH_HDRLEN</a>(tcphdr) * 4;</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>  <span class="keywordflow">if</span> ((hdrlen_bytes < <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5758db371d6daa394d178429b7c94c2a">TCP_HLEN</a>) || (hdrlen_bytes > p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a>)) {</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_input: invalid header length (%"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">")\n"</span>, (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)hdrlen_bytes));</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.lenerr);</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">goto</span> dropped;</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  }</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  </div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="comment">/* Move the payload pointer in the pbuf so that it points to the</span></div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span> <span class="comment"> TCP data instead of the TCP header. */</span></div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  tcphdr_optlen = hdrlen_bytes - <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5758db371d6daa394d178429b7c94c2a">TCP_HLEN</a>;</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  tcphdr_opt2 = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="keywordflow">if</span> (p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> >= hdrlen_bytes) {</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  <span class="comment">/* all options are in the first pbuf */</span></div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  tcphdr_opt1len = tcphdr_optlen;</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <a class="code" href="../../d0/d35/pbuf_8h.html#aaa17c1951cf2d207b6adfd3947d91f00">pbuf_header</a>(p, -(<a class="code" href="../../de/d8c/group__compiler__abstraction.html#gacf46f4df0ebab84edebcb69967fdf86b">s16_t</a>)hdrlen_bytes); <span class="comment">/* cannot fail */</span></div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> opt2len;</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <span class="comment">/* TCP header fits into first pbuf, options don't - data is in the next pbuf */</span></div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  <span class="comment">/* there must be a next pbuf, due to hdrlen_bytes sanity check above */</span></div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"p->next != NULL"</span>, p-><a class="code" href="../../d9/db8/structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a> != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  </div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <span class="comment">/* advance over the TCP header (cannot fail) */</span></div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <a class="code" href="../../d0/d35/pbuf_8h.html#aaa17c1951cf2d207b6adfd3947d91f00">pbuf_header</a>(p, -<a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5758db371d6daa394d178429b7c94c2a">TCP_HLEN</a>);</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  </div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="comment">/* determine how long the first and second parts of the options are */</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  tcphdr_opt1len = p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>;</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  opt2len = tcphdr_optlen - tcphdr_opt1len;</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  </div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  <span class="comment">/* options continue in the next pbuf: set p to zero length and hide the</span></div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="comment"> options in the next pbuf (adjusting p->tot_len) */</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <a class="code" href="../../d0/d35/pbuf_8h.html#aaa17c1951cf2d207b6adfd3947d91f00">pbuf_header</a>(p, -(<a class="code" href="../../de/d8c/group__compiler__abstraction.html#gacf46f4df0ebab84edebcb69967fdf86b">s16_t</a>)tcphdr_opt1len);</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  </div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  <span class="comment">/* check that the options fit in the second pbuf */</span></div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  <span class="keywordflow">if</span> (opt2len > p-><a class="code" href="../../d9/db8/structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>) {</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="comment">/* drop short packets */</span></div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_input: options overflow second pbuf (%"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" bytes)\n"</span>, p-><a class="code" href="../../d9/db8/structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>));</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.lenerr);</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="keywordflow">goto</span> dropped;</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  }</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  </div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  <span class="comment">/* remember the pointer to the second part of the options */</span></div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  tcphdr_opt2 = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>*)p-><a class="code" href="../../d9/db8/structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>-><a class="code" href="../../d9/db8/structpbuf.html#a8d32dc3e964369d4eec638fc37fbc460">payload</a>;</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  </div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="comment">/* advance p->next to point after the options, and manually</span></div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span> <span class="comment"> adjust p->tot_len to keep it consistent with the changed p->next */</span></div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <a class="code" href="../../d0/d35/pbuf_8h.html#aaa17c1951cf2d207b6adfd3947d91f00">pbuf_header</a>(p-><a class="code" href="../../d9/db8/structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>, -(<a class="code" href="../../de/d8c/group__compiler__abstraction.html#gacf46f4df0ebab84edebcb69967fdf86b">s16_t</a>)opt2len);</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a> -= opt2len;</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  </div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"p->len == 0"</span>, p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> == 0);</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"p->tot_len == p->next->tot_len"</span>, p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a> == p-><a class="code" href="../../d9/db8/structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a>);</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  }</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  </div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <span class="comment">/* Convert fields in TCP header to host byte order. */</span></div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  tcphdr->src = <a class="code" href="../../d4/da4/def_8h.html#ac642bf6057869696d7807564d8309ffc">lwip_ntohs</a>(tcphdr->src);</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  tcphdr->dest = <a class="code" href="../../d4/da4/def_8h.html#ac642bf6057869696d7807564d8309ffc">lwip_ntohs</a>(tcphdr->dest);</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  seqno = tcphdr->seqno = <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(tcphdr->seqno);</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  ackno = tcphdr->ackno = <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(tcphdr->ackno);</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  tcphdr->wnd = <a class="code" href="../../d4/da4/def_8h.html#ac642bf6057869696d7807564d8309ffc">lwip_ntohs</a>(tcphdr->wnd);</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>  </div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>  flags = <a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(tcphdr);</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  tcplen = p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a> + ((flags & (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a> | <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a>)) ? 1 : 0);</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  </div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="comment">/* Demultiplex an incoming segment. First, we check if it is destined</span></div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span> <span class="comment"> for an active connection. */</span></div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>  prev = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>  </div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>  <span class="keywordflow">for</span> (pcb = tcp_active_pcbs; pcb != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>; pcb = pcb->next) {</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_input: active pcb->state != CLOSED"</span>, pcb->state != CLOSED);</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_input: active pcb->state != TIME-WAIT"</span>, pcb->state != TIME_WAIT);</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_input: active pcb->state != LISTEN"</span>, pcb->state != LISTEN);</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>  <span class="keywordflow">if</span> (pcb->remote_port == tcphdr->src &&</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>  pcb->local_port == tcphdr->dest &&</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>  <a class="code" href="../../de/df7/ip__addr_8h.html#a008c9c92d770cc030ea054e6b259835a">ip_addr_cmp</a>(&pcb->remote_ip, <a class="code" href="../../da/d2f/ip_8h.html#a4e35b7692c228c98e738892f0a215647">ip_current_src_addr</a>()) &&</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>  <a class="code" href="../../de/df7/ip__addr_8h.html#a008c9c92d770cc030ea054e6b259835a">ip_addr_cmp</a>(&pcb->local_ip, <a class="code" href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a>())) {</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>  <span class="comment">/* Move this PCB to the front of the list so that subsequent</span></div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span> <span class="comment"> lookups will be faster (we exploit locality in TCP segment</span></div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span> <span class="comment"> arrivals). */</span></div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_input: pcb->next != pcb (before cache)"</span>, pcb->next != pcb);</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keywordflow">if</span> (prev != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  prev->next = pcb->next;</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  pcb->next = tcp_active_pcbs;</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>  tcp_active_pcbs = pcb;</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.cachehit);</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  }</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_input: pcb->next != pcb (after cache)"</span>, pcb->next != pcb);</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>  }</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  prev = pcb;</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  }</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>  </div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span>  <span class="keywordflow">if</span> (pcb == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span>  <span class="comment">/* If it did not go to an active connection, we check the connections</span></div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> <span class="comment"> in the TIME-WAIT state. */</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordflow">for</span> (pcb = tcp_tw_pcbs; pcb != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>; pcb = pcb->next) {</div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_input: TIME-WAIT pcb->state == TIME-WAIT"</span>, pcb->state == TIME_WAIT);</div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span>  <span class="keywordflow">if</span> (pcb->remote_port == tcphdr->src &&</div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  pcb->local_port == tcphdr->dest &&</div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  <a class="code" href="../../de/df7/ip__addr_8h.html#a008c9c92d770cc030ea054e6b259835a">ip_addr_cmp</a>(&pcb->remote_ip, <a class="code" href="../../da/d2f/ip_8h.html#a4e35b7692c228c98e738892f0a215647">ip_current_src_addr</a>()) &&</div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  <a class="code" href="../../de/df7/ip__addr_8h.html#a008c9c92d770cc030ea054e6b259835a">ip_addr_cmp</a>(&pcb->local_ip, <a class="code" href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a>())) {</div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="comment">/* We don't really care enough to move this PCB to the front</span></div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span> <span class="comment"> of the list since we are not very likely to receive that</span></div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span> <span class="comment"> many segments for connections in TIME-WAIT. */</span></div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_input: packed for TIME_WAITing connection.\n"</span>));</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  tcp_timewait_input(pcb);</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(p);</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00266"></a><span class="lineno"> 266</span>  }</div>
<div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  }</div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  </div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="comment">/* Finally, if we still did not get a match, we check all PCBs that</span></div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span> <span class="comment"> are LISTENing for incoming connections. */</span></div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  prev = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <span class="keywordflow">for</span> (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>; lpcb = lpcb->next) {</div>
<div class="line"><a name="l00273"></a><span class="lineno"> 273</span>  <span class="keywordflow">if</span> (lpcb->local_port == tcphdr->dest) {</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keywordflow">if</span> (<a class="code" href="../../de/df7/ip__addr_8h.html#a83b17dbf7d1faf5c8f8c20b039db8bb8">IP_IS_ANY_TYPE_VAL</a>(lpcb->local_ip)) {</div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  <span class="comment">/* found an ANY TYPE (IPv4/IPv6) match */</span></div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span> <span class="preprocessor">#if SO_REUSE</span></div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  lpcb_any = lpcb;</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  lpcb_prev = prev;</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span> <span class="preprocessor">#else </span><span class="comment">/* SO_REUSE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span> <span class="preprocessor">#endif </span><span class="comment">/* SO_REUSE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="../../de/df7/ip__addr_8h.html#a81ed1fbe375d867d6e77c83976c07671">IP_ADDR_PCB_VERSION_MATCH_EXACT</a>(lpcb, <a class="code" href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a>())) {</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  <span class="keywordflow">if</span> (<a class="code" href="../../de/df7/ip__addr_8h.html#a008c9c92d770cc030ea054e6b259835a">ip_addr_cmp</a>(&lpcb->local_ip, <a class="code" href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a>())) {</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="comment">/* found an exact match */</span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="../../de/df7/ip__addr_8h.html#a279118890e6a90aa740051fb8b0cc5f4">ip_addr_isany</a>(&lpcb->local_ip)) {</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  <span class="comment">/* found an ANY-match */</span></div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span> <span class="preprocessor">#if SO_REUSE</span></div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  lpcb_any = lpcb;</div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  lpcb_prev = prev;</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span> <span class="preprocessor">#else </span><span class="comment">/* SO_REUSE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span> <span class="preprocessor"> #endif </span><span class="comment">/* SO_REUSE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  }</div>
<div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  }</div>
<div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  }</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  prev = (<span class="keyword">struct </span>tcp_pcb *)lpcb;</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  }</div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span> <span class="preprocessor">#if SO_REUSE</span></div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="comment">/* first try specific local IP */</span></div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  <span class="keywordflow">if</span> (lpcb == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  <span class="comment">/* only pass to ANY if no specific local IP has been found */</span></div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  lpcb = lpcb_any;</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  prev = lpcb_prev;</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  }</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span> <span class="preprocessor">#endif </span><span class="comment">/* SO_REUSE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="keywordflow">if</span> (lpcb != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <span class="comment">/* Move this PCB to the front of the list so that subsequent</span></div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span> <span class="comment"> lookups will be faster (we exploit locality in TCP segment</span></div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span> <span class="comment"> arrivals). */</span></div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  <span class="keywordflow">if</span> (prev != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  ((<span class="keyword">struct </span>tcp_pcb_listen *)prev)->next = lpcb->next;</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  <span class="comment">/* our successor is the remainder of the listening list */</span></div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  lpcb->next = tcp_listen_pcbs.listen_pcbs;</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="comment">/* put this listening pcb at the head of the listening list */</span></div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  tcp_listen_pcbs.listen_pcbs = lpcb;</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.cachehit);</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  }</div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  </div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_input: packed for LISTENing connection.\n"</span>));</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  tcp_listen_input(lpcb);</div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(p);</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  }</div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  }</div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  </div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span> <span class="preprocessor">#if TCP_INPUT_DEBUG</span></div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"+-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags "</span>));</div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  tcp_debug_print_flags(<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(tcphdr));</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"-+-+-+-+-+-+-+-+-+-+-+-+-+-+\n"</span>));</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_INPUT_DEBUG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  </div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  </div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  <span class="keywordflow">if</span> (pcb != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <span class="comment">/* The incoming segment belongs to a connection. */</span></div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span> <span class="preprocessor">#if TCP_INPUT_DEBUG</span></div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  tcp_debug_print_state(pcb->state);</div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_INPUT_DEBUG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  </div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  <span class="comment">/* Set up a tcp_seg structure. */</span></div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  inseg.next = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  inseg.len = p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a>;</div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  inseg.p = p;</div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  inseg.tcphdr = tcphdr;</div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  </div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  recv_data = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  recv_flags = 0;</div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  recv_acked = 0;</div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>  </div>
<div class="line"><a name="l00351"></a><span class="lineno"> 351</span>  <span class="keywordflow">if</span> (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a1320fd0006a2f70138bc2d0018dda829">TCP_PSH</a>) {</div>
<div class="line"><a name="l00352"></a><span class="lineno"> 352</span>  p-><a class="code" href="../../d9/db8/structpbuf.html#aa4d1af2cab3d9280d29212095b5b872a">flags</a> |= <a class="code" href="../../d0/d35/pbuf_8h.html#a018a6499e357f8a1373321f802a82930">PBUF_FLAG_PUSH</a>;</div>
<div class="line"><a name="l00353"></a><span class="lineno"> 353</span>  }</div>
<div class="line"><a name="l00354"></a><span class="lineno"> 354</span>  </div>
<div class="line"><a name="l00355"></a><span class="lineno"> 355</span>  <span class="comment">/* If there is data which was previously "refused" by upper layer */</span></div>
<div class="line"><a name="l00356"></a><span class="lineno"> 356</span>  <span class="keywordflow">if</span> (pcb->refused_data != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00357"></a><span class="lineno"> 357</span>  <span class="keywordflow">if</span> ((tcp_process_refused_data(pcb) == <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaf316b2c5eee4079820f7100849115142">ERR_ABRT</a>) ||</div>
<div class="line"><a name="l00358"></a><span class="lineno"> 358</span>  ((pcb->refused_data != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) && (tcplen > 0))) {</div>
<div class="line"><a name="l00359"></a><span class="lineno"> 359</span>  <span class="comment">/* pcb has been aborted or refused data is still refused and the new</span></div>
<div class="line"><a name="l00360"></a><span class="lineno"> 360</span> <span class="comment"> segment contains data */</span></div>
<div class="line"><a name="l00361"></a><span class="lineno"> 361</span>  <span class="keywordflow">if</span> (pcb->rcv_ann_wnd == 0) {</div>
<div class="line"><a name="l00362"></a><span class="lineno"> 362</span>  <span class="comment">/* this is a zero-window probe, we respond to it with current RCV.NXT</span></div>
<div class="line"><a name="l00363"></a><span class="lineno"> 363</span> <span class="comment"> and drop the data segment */</span></div>
<div class="line"><a name="l00364"></a><span class="lineno"> 364</span>  tcp_send_empty_ack(pcb);</div>
<div class="line"><a name="l00365"></a><span class="lineno"> 365</span>  }</div>
<div class="line"><a name="l00366"></a><span class="lineno"> 366</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.drop);</div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a237a8f1e47af42fb612e936e928a9ced">MIB2_STATS_INC</a>(mib2.tcpinerrs);</div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span>  <span class="keywordflow">goto</span> aborted;</div>
<div class="line"><a name="l00369"></a><span class="lineno"> 369</span>  }</div>
<div class="line"><a name="l00370"></a><span class="lineno"> 370</span>  }</div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  tcp_input_pcb = pcb;</div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  err = tcp_process(pcb);</div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  <span class="comment">/* A return value of ERR_ABRT means that tcp_abort() was called</span></div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span> <span class="comment"> and that the pcb has been freed. If so, we don't do anything. */</span></div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  <span class="keywordflow">if</span> (err != <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaf316b2c5eee4079820f7100849115142">ERR_ABRT</a>) {</div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span>  <span class="keywordflow">if</span> (recv_flags & TF_RESET) {</div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  <span class="comment">/* TF_RESET means that the connection was reset by the other</span></div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span> <span class="comment"> end. We then call the error callback to inform the</span></div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span> <span class="comment"> application that the connection is dead before we</span></div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span> <span class="comment"> deallocate the PCB. */</span></div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span>  TCP_EVENT_ERR(pcb->state, pcb->errf, pcb->callback_arg, <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadca759030525f1768a23dc086a5fd45b4e5">ERR_RST</a>);</div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span>  tcp_pcb_remove(&tcp_active_pcbs, pcb);</div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  <a class="code" href="../../df/dff/memp_8h.html#aecd94926b7c2a0e23ae195f4ae97581f">memp_free</a>(MEMP_TCP_PCB, pcb);</div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  err = <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa26c163b80b1f6786ca81dadc14b00fb">ERR_OK</a>;</div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  <span class="comment">/* If the application has registered a "sent" function to be</span></div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span> <span class="comment"> called when new send buffer space is available, we call it</span></div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span> <span class="comment"> now. */</span></div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  <span class="keywordflow">if</span> (recv_acked > 0) {</div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> acked16;</div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span> <span class="preprocessor">#if LWIP_WND_SCALE</span></div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  <span class="comment">/* recv_acked is u32_t but the sent callback only takes a u16_t,</span></div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span> <span class="comment"> so we might have to call it multiple times. */</span></div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> acked = recv_acked;</div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  <span class="keywordflow">while</span> (acked > 0) {</div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  acked16 = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)<a class="code" href="../../d4/da4/def_8h.html#a748f5df614a3fc989e8900fd229d6e4e">LWIP_MIN</a>(acked, 0xffffu);</div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span>  acked -= acked16;</div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  {</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  acked16 = recv_acked;</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  TCP_EVENT_SENT(pcb, (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)acked16, err);</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  <span class="keywordflow">if</span> (err == <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaf316b2c5eee4079820f7100849115142">ERR_ABRT</a>) {</div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  <span class="keywordflow">goto</span> aborted;</div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</span>  }</div>
<div class="line"><a name="l00406"></a><span class="lineno"> 406</span>  }</div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  recv_acked = 0;</div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  }</div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  <span class="keywordflow">if</span> (tcp_input_delayed_close(pcb)) {</div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span>  <span class="keywordflow">goto</span> aborted;</div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  }</div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span> <span class="preprocessor">#if TCP_QUEUE_OOSEQ && LWIP_WND_SCALE</span></div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span>  <span class="keywordflow">while</span> (recv_data != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *rest = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  pbuf_split_64k(recv_data, &rest);</div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span> <span class="preprocessor">#else </span><span class="comment">/* TCP_QUEUE_OOSEQ && LWIP_WND_SCALE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  <span class="keywordflow">if</span> (recv_data != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_QUEUE_OOSEQ && LWIP_WND_SCALE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span>  </div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"pcb->refused_data == NULL"</span>, pcb->refused_data == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);</div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  <span class="keywordflow">if</span> (pcb->flags & TF_RXCLOSED) {</div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  <span class="comment">/* received data although already closed -> abort (send RST) to</span></div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span> <span class="comment"> notify the remote host that not all data has been processed */</span></div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(recv_data);</div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span> <span class="preprocessor">#if TCP_QUEUE_OOSEQ && LWIP_WND_SCALE</span></div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span>  <span class="keywordflow">if</span> (rest != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(rest);</div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span>  }</div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_QUEUE_OOSEQ && LWIP_WND_SCALE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span>  tcp_abort(pcb);</div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span>  <span class="keywordflow">goto</span> aborted;</div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span>  }</div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span>  </div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span>  <span class="comment">/* Notify application that data has been received. */</span></div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span>  TCP_EVENT_RECV(pcb, recv_data, <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa26c163b80b1f6786ca81dadc14b00fb">ERR_OK</a>, err);</div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span>  <span class="keywordflow">if</span> (err == <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaf316b2c5eee4079820f7100849115142">ERR_ABRT</a>) {</div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span> <span class="preprocessor">#if TCP_QUEUE_OOSEQ && LWIP_WND_SCALE</span></div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span>  <span class="keywordflow">if</span> (rest != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(rest);</div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span>  }</div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_QUEUE_OOSEQ && LWIP_WND_SCALE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span>  <span class="keywordflow">goto</span> aborted;</div>
<div class="line"><a name="l00443"></a><span class="lineno"> 443</span>  }</div>
<div class="line"><a name="l00444"></a><span class="lineno"> 444</span>  </div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</span>  <span class="comment">/* If the upper layer can't receive this data, store it */</span></div>
<div class="line"><a name="l00446"></a><span class="lineno"> 446</span>  <span class="keywordflow">if</span> (err != <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa26c163b80b1f6786ca81dadc14b00fb">ERR_OK</a>) {</div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span> <span class="preprocessor">#if TCP_QUEUE_OOSEQ && LWIP_WND_SCALE</span></div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  <span class="keywordflow">if</span> (rest != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  <a class="code" href="../../d7/d05/group__pbuf.html#ga82429084fe29015509c9b4a072707cd4">pbuf_cat</a>(recv_data, rest);</div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  }</div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_QUEUE_OOSEQ && LWIP_WND_SCALE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span>  pcb->refused_data = recv_data;</div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_input: keep incoming packet, because pcb is \"full\"\n"</span>));</div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span> <span class="preprocessor">#if TCP_QUEUE_OOSEQ && LWIP_WND_SCALE</span></div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  <span class="comment">/* Upper layer received the data, go on with the rest if > 64K */</span></div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  recv_data = rest;</div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_QUEUE_OOSEQ && LWIP_WND_SCALE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span>  }</div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span>  }</div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span>  </div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span>  <span class="comment">/* If a FIN segment was received, we call the callback</span></div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span> <span class="comment"> function with a NULL buffer to indicate EOF. */</span></div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span>  <span class="keywordflow">if</span> (recv_flags & TF_GOT_FIN) {</div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span>  <span class="keywordflow">if</span> (pcb->refused_data != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  <span class="comment">/* Delay this if we have refused data. */</span></div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  pcb->refused_data-><a class="code" href="../../d9/db8/structpbuf.html#aa4d1af2cab3d9280d29212095b5b872a">flags</a> |= <a class="code" href="../../d0/d35/pbuf_8h.html#a36a915aa2f6a188baa2862881407971e">PBUF_FLAG_TCP_FIN</a>;</div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span>  <span class="comment">/* correct rcv_wnd as the application won't call tcp_recved()</span></div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span> <span class="comment"> for the FIN's seqno */</span></div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  <span class="keywordflow">if</span> (pcb->rcv_wnd != TCP_WND_MAX(pcb)) {</div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  pcb->rcv_wnd++;</div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  }</div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  TCP_EVENT_CLOSED(pcb, err);</div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  <span class="keywordflow">if</span> (err == <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaf316b2c5eee4079820f7100849115142">ERR_ABRT</a>) {</div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  <span class="keywordflow">goto</span> aborted;</div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  }</div>
<div class="line"><a name="l00479"></a><span class="lineno"> 479</span>  }</div>
<div class="line"><a name="l00480"></a><span class="lineno"> 480</span>  }</div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span>  </div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span>  tcp_input_pcb = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  <span class="keywordflow">if</span> (tcp_input_delayed_close(pcb)) {</div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  <span class="keywordflow">goto</span> aborted;</div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span>  }</div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span>  <span class="comment">/* Try to send something out. */</span></div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span>  tcp_output(pcb);</div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span> <span class="preprocessor">#if TCP_INPUT_DEBUG</span></div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span> <span class="preprocessor">#if TCP_DEBUG</span></div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span>  tcp_debug_print_state(pcb->state);</div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_DEBUG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_INPUT_DEBUG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span>  }</div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span>  }</div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  <span class="comment">/* Jump target if pcb has been aborted in a callback (by calling tcp_abort()).</span></div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span> <span class="comment"> Below this line, 'pcb' may not be dereferenced! */</span></div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span> aborted:</div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  tcp_input_pcb = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  recv_data = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span>  </div>
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span>  <span class="comment">/* give up our reference to inseg.p */</span></div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  <span class="keywordflow">if</span> (inseg.p != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>)</div>
<div class="line"><a name="l00503"></a><span class="lineno"> 503</span>  {</div>
<div class="line"><a name="l00504"></a><span class="lineno"> 504</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(inseg.p);</div>
<div class="line"><a name="l00505"></a><span class="lineno"> 505</span>  inseg.p = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00506"></a><span class="lineno"> 506</span>  }</div>
<div class="line"><a name="l00507"></a><span class="lineno"> 507</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00508"></a><span class="lineno"> 508</span>  </div>
<div class="line"><a name="l00509"></a><span class="lineno"> 509</span>  <span class="comment">/* If no matching PCB was found, send a TCP RST (reset) to the</span></div>
<div class="line"><a name="l00510"></a><span class="lineno"> 510</span> <span class="comment"> sender. */</span></div>
<div class="line"><a name="l00511"></a><span class="lineno"> 511</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a37596f7bbb9b7663826244ba54486679">TCP_RST_DEBUG</a>, (<span class="stringliteral">"tcp_input: no PCB match found, resetting.\n"</span>));</div>
<div class="line"><a name="l00512"></a><span class="lineno"> 512</span>  <span class="keywordflow">if</span> (!(<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5ca559def464ef20d8b1f7d32f2f160d">TCP_RST</a>)) {</div>
<div class="line"><a name="l00513"></a><span class="lineno"> 513</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.proterr);</div>
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.drop);</div>
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  tcp_rst(ackno, seqno + tcplen, <a class="code" href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a>(),</div>
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span>  <a class="code" href="../../da/d2f/ip_8h.html#a4e35b7692c228c98e738892f0a215647">ip_current_src_addr</a>(), tcphdr->dest, tcphdr->src);</div>
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span>  }</div>
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(p);</div>
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span>  }</div>
<div class="line"><a name="l00520"></a><span class="lineno"> 520</span>  </div>
<div class="line"><a name="l00521"></a><span class="lineno"> 521</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_input: tcp_pcbs_sane()"</span>, tcp_pcbs_sane());</div>
<div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  <a class="code" href="../../d1/d3b/perf_8h.html#a8ac3afe5d720793a229fbf70a78eb82f">PERF_STOP</a>(<span class="stringliteral">"tcp_input"</span>);</div>
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span> dropped:</div>
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.drop);</div>
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a237a8f1e47af42fb612e936e928a9ced">MIB2_STATS_INC</a>(mib2.tcpinerrs);</div>
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(p);</div>
<div class="line"><a name="l00528"></a><span class="lineno"> 528</span> }</div>
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  </div>
<div class="line"><a name="l00535"></a><span class="lineno"> 535</span> <span class="keyword">static</span> <span class="keywordtype">int</span></div>
<div class="line"><a name="l00536"></a><span class="lineno"> 536</span> tcp_input_delayed_close(<span class="keyword">struct</span> tcp_pcb *pcb)</div>
<div class="line"><a name="l00537"></a><span class="lineno"> 537</span> {</div>
<div class="line"><a name="l00538"></a><span class="lineno"> 538</span>  <span class="keywordflow">if</span> (recv_flags & TF_CLOSED) {</div>
<div class="line"><a name="l00539"></a><span class="lineno"> 539</span>  <span class="comment">/* The connection has been closed and we will deallocate the</span></div>
<div class="line"><a name="l00540"></a><span class="lineno"> 540</span> <span class="comment"> PCB. */</span></div>
<div class="line"><a name="l00541"></a><span class="lineno"> 541</span>  <span class="keywordflow">if</span> (!(pcb->flags & TF_RXCLOSED)) {</div>
<div class="line"><a name="l00542"></a><span class="lineno"> 542</span>  <span class="comment">/* Connection closed although the application has only shut down the</span></div>
<div class="line"><a name="l00543"></a><span class="lineno"> 543</span> <span class="comment"> tx side: call the PCB's err callback and indicate the closure to</span></div>
<div class="line"><a name="l00544"></a><span class="lineno"> 544</span> <span class="comment"> ensure the application doesn't continue using the PCB. */</span></div>
<div class="line"><a name="l00545"></a><span class="lineno"> 545</span>  TCP_EVENT_ERR(pcb->state, pcb->errf, pcb->callback_arg, <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa5176d9fecf8ec43d3bc49f4e6c3f7f5">ERR_CLSD</a>);</div>
<div class="line"><a name="l00546"></a><span class="lineno"> 546</span>  }</div>
<div class="line"><a name="l00547"></a><span class="lineno"> 547</span>  tcp_pcb_remove(&tcp_active_pcbs, pcb);</div>
<div class="line"><a name="l00548"></a><span class="lineno"> 548</span>  <a class="code" href="../../df/dff/memp_8h.html#aecd94926b7c2a0e23ae195f4ae97581f">memp_free</a>(MEMP_TCP_PCB, pcb);</div>
<div class="line"><a name="l00549"></a><span class="lineno"> 549</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00550"></a><span class="lineno"> 550</span>  }</div>
<div class="line"><a name="l00551"></a><span class="lineno"> 551</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00552"></a><span class="lineno"> 552</span> }</div>
<div class="line"><a name="l00553"></a><span class="lineno"> 553</span>  </div>
<div class="line"><a name="l00563"></a><span class="lineno"> 563</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00564"></a><span class="lineno"> 564</span> tcp_listen_input(<span class="keyword">struct</span> tcp_pcb_listen *pcb)</div>
<div class="line"><a name="l00565"></a><span class="lineno"> 565</span> {</div>
<div class="line"><a name="l00566"></a><span class="lineno"> 566</span>  <span class="keyword">struct </span>tcp_pcb *npcb;</div>
<div class="line"><a name="l00567"></a><span class="lineno"> 567</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> iss;</div>
<div class="line"><a name="l00568"></a><span class="lineno"> 568</span>  <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> rc;</div>
<div class="line"><a name="l00569"></a><span class="lineno"> 569</span>  </div>
<div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  <span class="keywordflow">if</span> (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5ca559def464ef20d8b1f7d32f2f160d">TCP_RST</a>) {</div>
<div class="line"><a name="l00571"></a><span class="lineno"> 571</span>  <span class="comment">/* An incoming RST should be ignored. Return. */</span></div>
<div class="line"><a name="l00572"></a><span class="lineno"> 572</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00573"></a><span class="lineno"> 573</span>  }</div>
<div class="line"><a name="l00574"></a><span class="lineno"> 574</span>  </div>
<div class="line"><a name="l00575"></a><span class="lineno"> 575</span>  <span class="comment">/* In the LISTEN state, we check for incoming SYN segments,</span></div>
<div class="line"><a name="l00576"></a><span class="lineno"> 576</span> <span class="comment"> creates a new PCB, and responds with a SYN|ACK. */</span></div>
<div class="line"><a name="l00577"></a><span class="lineno"> 577</span>  <span class="keywordflow">if</span> (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>) {</div>
<div class="line"><a name="l00578"></a><span class="lineno"> 578</span>  <span class="comment">/* For incoming segments with the ACK flag set, respond with a</span></div>
<div class="line"><a name="l00579"></a><span class="lineno"> 579</span> <span class="comment"> RST. */</span></div>
<div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a37596f7bbb9b7663826244ba54486679">TCP_RST_DEBUG</a>, (<span class="stringliteral">"tcp_listen_input: ACK in LISTEN, sending reset\n"</span>));</div>
<div class="line"><a name="l00581"></a><span class="lineno"> 581</span>  tcp_rst(ackno, seqno + tcplen, <a class="code" href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a>(),</div>
<div class="line"><a name="l00582"></a><span class="lineno"> 582</span>  <a class="code" href="../../da/d2f/ip_8h.html#a4e35b7692c228c98e738892f0a215647">ip_current_src_addr</a>(), tcphdr->dest, tcphdr->src);</div>
<div class="line"><a name="l00583"></a><span class="lineno"> 583</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a>) {</div>
<div class="line"><a name="l00584"></a><span class="lineno"> 584</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a4f43bb8a430c7a52a1ad5086d3f2803c">TCP_DEBUG</a>, (<span class="stringliteral">"TCP connection request %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" -> %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">".\n"</span>, tcphdr->src, tcphdr->dest));</div>
<div class="line"><a name="l00585"></a><span class="lineno"> 585</span> <span class="preprocessor">#if TCP_LISTEN_BACKLOG</span></div>
<div class="line"><a name="l00586"></a><span class="lineno"> 586</span>  <span class="keywordflow">if</span> (pcb->accepts_pending >= pcb->backlog) {</div>
<div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a4f43bb8a430c7a52a1ad5086d3f2803c">TCP_DEBUG</a>, (<span class="stringliteral">"tcp_listen_input: listen backlog exceeded for port %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">"\n"</span>, tcphdr->dest));</div>
<div class="line"><a name="l00588"></a><span class="lineno"> 588</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00589"></a><span class="lineno"> 589</span>  }</div>
<div class="line"><a name="l00590"></a><span class="lineno"> 590</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_LISTEN_BACKLOG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00591"></a><span class="lineno"> 591</span>  npcb = tcp_alloc(pcb->prio);</div>
<div class="line"><a name="l00592"></a><span class="lineno"> 592</span>  <span class="comment">/* If a new PCB could not be created (probably due to lack of memory),</span></div>
<div class="line"><a name="l00593"></a><span class="lineno"> 593</span> <span class="comment"> we don't do anything, but rely on the sender will retransmit the</span></div>
<div class="line"><a name="l00594"></a><span class="lineno"> 594</span> <span class="comment"> SYN at a time when we have more memory available. */</span></div>
<div class="line"><a name="l00595"></a><span class="lineno"> 595</span>  <span class="keywordflow">if</span> (npcb == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00596"></a><span class="lineno"> 596</span>  <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err;</div>
<div class="line"><a name="l00597"></a><span class="lineno"> 597</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a4f43bb8a430c7a52a1ad5086d3f2803c">TCP_DEBUG</a>, (<span class="stringliteral">"tcp_listen_input: could not allocate PCB\n"</span>));</div>
<div class="line"><a name="l00598"></a><span class="lineno"> 598</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.memerr);</div>
<div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  TCP_EVENT_ACCEPT(pcb, <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, pcb->callback_arg, <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaaaeafdbf3aecc46864daa3cd829c7e05">ERR_MEM</a>, err);</div>
<div class="line"><a name="l00600"></a><span class="lineno"> 600</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga70624a5deb8b9199406372a7f3603ecf">LWIP_UNUSED_ARG</a>(err); <span class="comment">/* err not useful here */</span></div>
<div class="line"><a name="l00601"></a><span class="lineno"> 601</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00602"></a><span class="lineno"> 602</span>  }</div>
<div class="line"><a name="l00603"></a><span class="lineno"> 603</span> <span class="preprocessor">#if TCP_LISTEN_BACKLOG</span></div>
<div class="line"><a name="l00604"></a><span class="lineno"> 604</span>  pcb->accepts_pending++;</div>
<div class="line"><a name="l00605"></a><span class="lineno"> 605</span>  npcb->flags |= TF_BACKLOGPEND;</div>
<div class="line"><a name="l00606"></a><span class="lineno"> 606</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_LISTEN_BACKLOG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00607"></a><span class="lineno"> 607</span>  <span class="comment">/* Set up the new PCB. */</span></div>
<div class="line"><a name="l00608"></a><span class="lineno"> 608</span>  <a class="code" href="../../de/df7/ip__addr_8h.html#a77a933975db287f6aa5c2e70249ba18f">ip_addr_copy</a>(npcb->local_ip, *<a class="code" href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a>());</div>
<div class="line"><a name="l00609"></a><span class="lineno"> 609</span>  <a class="code" href="../../de/df7/ip__addr_8h.html#a77a933975db287f6aa5c2e70249ba18f">ip_addr_copy</a>(npcb->remote_ip, *<a class="code" href="../../da/d2f/ip_8h.html#a4e35b7692c228c98e738892f0a215647">ip_current_src_addr</a>());</div>
<div class="line"><a name="l00610"></a><span class="lineno"> 610</span>  npcb->local_port = pcb->local_port;</div>
<div class="line"><a name="l00611"></a><span class="lineno"> 611</span>  npcb->remote_port = tcphdr->src;</div>
<div class="line"><a name="l00612"></a><span class="lineno"> 612</span>  npcb->state = SYN_RCVD;</div>
<div class="line"><a name="l00613"></a><span class="lineno"> 613</span>  npcb->rcv_nxt = seqno + 1;</div>
<div class="line"><a name="l00614"></a><span class="lineno"> 614</span>  npcb->rcv_ann_right_edge = npcb->rcv_nxt;</div>
<div class="line"><a name="l00615"></a><span class="lineno"> 615</span>  iss = tcp_next_iss(npcb);</div>
<div class="line"><a name="l00616"></a><span class="lineno"> 616</span>  npcb->snd_wl2 = iss;</div>
<div class="line"><a name="l00617"></a><span class="lineno"> 617</span>  npcb->snd_nxt = iss;</div>
<div class="line"><a name="l00618"></a><span class="lineno"> 618</span>  npcb->lastack = iss;</div>
<div class="line"><a name="l00619"></a><span class="lineno"> 619</span>  npcb->snd_lbb = iss;</div>
<div class="line"><a name="l00620"></a><span class="lineno"> 620</span>  npcb->snd_wl1 = seqno - 1;<span class="comment">/* initialise to seqno-1 to force window update */</span></div>
<div class="line"><a name="l00621"></a><span class="lineno"> 621</span>  npcb->callback_arg = pcb->callback_arg;</div>
<div class="line"><a name="l00622"></a><span class="lineno"> 622</span> <span class="preprocessor">#if LWIP_CALLBACK_API || TCP_LISTEN_BACKLOG</span></div>
<div class="line"><a name="l00623"></a><span class="lineno"> 623</span>  npcb->listener = pcb;</div>
<div class="line"><a name="l00624"></a><span class="lineno"> 624</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_CALLBACK_API || TCP_LISTEN_BACKLOG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00625"></a><span class="lineno"> 625</span>  <span class="comment">/* inherit socket options */</span></div>
<div class="line"><a name="l00626"></a><span class="lineno"> 626</span>  npcb->so_options = pcb->so_options & <a class="code" href="../../da/d2f/ip_8h.html#ae4bbdf8a2e757d758ec0e1c91b58893f">SOF_INHERITED</a>;</div>
<div class="line"><a name="l00627"></a><span class="lineno"> 627</span>  <span class="comment">/* Register the new PCB so that we can begin receiving segments</span></div>
<div class="line"><a name="l00628"></a><span class="lineno"> 628</span> <span class="comment"> for it. */</span></div>
<div class="line"><a name="l00629"></a><span class="lineno"> 629</span>  TCP_REG_ACTIVE(npcb);</div>
<div class="line"><a name="l00630"></a><span class="lineno"> 630</span>  </div>
<div class="line"><a name="l00631"></a><span class="lineno"> 631</span>  <span class="comment">/* Parse any options in the SYN. */</span></div>
<div class="line"><a name="l00632"></a><span class="lineno"> 632</span>  tcp_parseopt(npcb);</div>
<div class="line"><a name="l00633"></a><span class="lineno"> 633</span>  npcb->snd_wnd = tcphdr->wnd;</div>
<div class="line"><a name="l00634"></a><span class="lineno"> 634</span>  npcb->snd_wnd_max = npcb->snd_wnd;</div>
<div class="line"><a name="l00635"></a><span class="lineno"> 635</span>  </div>
<div class="line"><a name="l00636"></a><span class="lineno"> 636</span> <span class="preprocessor">#if TCP_CALCULATE_EFF_SEND_MSS</span></div>
<div class="line"><a name="l00637"></a><span class="lineno"> 637</span>  npcb->mss = tcp_eff_send_mss(npcb->mss, &npcb->local_ip, &npcb->remote_ip);</div>
<div class="line"><a name="l00638"></a><span class="lineno"> 638</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CALCULATE_EFF_SEND_MSS */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00639"></a><span class="lineno"> 639</span>  </div>
<div class="line"><a name="l00640"></a><span class="lineno"> 640</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a237a8f1e47af42fb612e936e928a9ced">MIB2_STATS_INC</a>(mib2.tcppassiveopens);</div>
<div class="line"><a name="l00641"></a><span class="lineno"> 641</span>  </div>
<div class="line"><a name="l00642"></a><span class="lineno"> 642</span>  <span class="comment">/* Send a SYN|ACK together with the MSS option. */</span></div>
<div class="line"><a name="l00643"></a><span class="lineno"> 643</span>  rc = tcp_enqueue_flags(npcb, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a> | <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>);</div>
<div class="line"><a name="l00644"></a><span class="lineno"> 644</span>  <span class="keywordflow">if</span> (rc != <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa26c163b80b1f6786ca81dadc14b00fb">ERR_OK</a>) {</div>
<div class="line"><a name="l00645"></a><span class="lineno"> 645</span>  tcp_abandon(npcb, 0);</div>
<div class="line"><a name="l00646"></a><span class="lineno"> 646</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00647"></a><span class="lineno"> 647</span>  }</div>
<div class="line"><a name="l00648"></a><span class="lineno"> 648</span>  tcp_output(npcb);</div>
<div class="line"><a name="l00649"></a><span class="lineno"> 649</span>  }</div>
<div class="line"><a name="l00650"></a><span class="lineno"> 650</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00651"></a><span class="lineno"> 651</span> }</div>
<div class="line"><a name="l00652"></a><span class="lineno"> 652</span>  </div>
<div class="line"><a name="l00662"></a><span class="lineno"> 662</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00663"></a><span class="lineno"> 663</span> tcp_timewait_input(<span class="keyword">struct</span> tcp_pcb *pcb)</div>
<div class="line"><a name="l00664"></a><span class="lineno"> 664</span> {</div>
<div class="line"><a name="l00665"></a><span class="lineno"> 665</span>  <span class="comment">/* RFC 1337: in TIME_WAIT, ignore RST and ACK FINs + any 'acceptable' segments */</span></div>
<div class="line"><a name="l00666"></a><span class="lineno"> 666</span>  <span class="comment">/* RFC 793 3.9 Event Processing - Segment Arrives:</span></div>
<div class="line"><a name="l00667"></a><span class="lineno"> 667</span> <span class="comment"> * - first check sequence number - we skip that one in TIME_WAIT (always</span></div>
<div class="line"><a name="l00668"></a><span class="lineno"> 668</span> <span class="comment"> * acceptable since we only send ACKs)</span></div>
<div class="line"><a name="l00669"></a><span class="lineno"> 669</span> <span class="comment"> * - second check the RST bit (... return) */</span></div>
<div class="line"><a name="l00670"></a><span class="lineno"> 670</span>  <span class="keywordflow">if</span> (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5ca559def464ef20d8b1f7d32f2f160d">TCP_RST</a>) {</div>
<div class="line"><a name="l00671"></a><span class="lineno"> 671</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00672"></a><span class="lineno"> 672</span>  }</div>
<div class="line"><a name="l00673"></a><span class="lineno"> 673</span>  <span class="comment">/* - fourth, check the SYN bit, */</span></div>
<div class="line"><a name="l00674"></a><span class="lineno"> 674</span>  <span class="keywordflow">if</span> (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a>) {</div>
<div class="line"><a name="l00675"></a><span class="lineno"> 675</span>  <span class="comment">/* If an incoming segment is not acceptable, an acknowledgment</span></div>
<div class="line"><a name="l00676"></a><span class="lineno"> 676</span> <span class="comment"> should be sent in reply */</span></div>
<div class="line"><a name="l00677"></a><span class="lineno"> 677</span>  <span class="keywordflow">if</span> (TCP_SEQ_BETWEEN(seqno, pcb->rcv_nxt, pcb->rcv_nxt + pcb->rcv_wnd)) {</div>
<div class="line"><a name="l00678"></a><span class="lineno"> 678</span>  <span class="comment">/* If the SYN is in the window it is an error, send a reset */</span></div>
<div class="line"><a name="l00679"></a><span class="lineno"> 679</span>  tcp_rst(ackno, seqno + tcplen, <a class="code" href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a>(),</div>
<div class="line"><a name="l00680"></a><span class="lineno"> 680</span>  <a class="code" href="../../da/d2f/ip_8h.html#a4e35b7692c228c98e738892f0a215647">ip_current_src_addr</a>(), tcphdr->dest, tcphdr->src);</div>
<div class="line"><a name="l00681"></a><span class="lineno"> 681</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00682"></a><span class="lineno"> 682</span>  }</div>
<div class="line"><a name="l00683"></a><span class="lineno"> 683</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) {</div>
<div class="line"><a name="l00684"></a><span class="lineno"> 684</span>  <span class="comment">/* - eighth, check the FIN bit: Remain in the TIME-WAIT state.</span></div>
<div class="line"><a name="l00685"></a><span class="lineno"> 685</span> <span class="comment"> Restart the 2 MSL time-wait timeout.*/</span></div>
<div class="line"><a name="l00686"></a><span class="lineno"> 686</span>  pcb->tmr = tcp_ticks;</div>
<div class="line"><a name="l00687"></a><span class="lineno"> 687</span>  }</div>
<div class="line"><a name="l00688"></a><span class="lineno"> 688</span>  </div>
<div class="line"><a name="l00689"></a><span class="lineno"> 689</span>  <span class="keywordflow">if</span> ((tcplen > 0)) {</div>
<div class="line"><a name="l00690"></a><span class="lineno"> 690</span>  <span class="comment">/* Acknowledge data, FIN or out-of-window SYN */</span></div>
<div class="line"><a name="l00691"></a><span class="lineno"> 691</span>  pcb->flags |= TF_ACK_NOW;</div>
<div class="line"><a name="l00692"></a><span class="lineno"> 692</span>  tcp_output(pcb);</div>
<div class="line"><a name="l00693"></a><span class="lineno"> 693</span>  }</div>
<div class="line"><a name="l00694"></a><span class="lineno"> 694</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00695"></a><span class="lineno"> 695</span> }</div>
<div class="line"><a name="l00696"></a><span class="lineno"> 696</span>  </div>
<div class="line"><a name="l00708"></a><span class="lineno"> 708</span> <span class="keyword">static</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a></div>
<div class="line"><a name="l00709"></a><span class="lineno"> 709</span> tcp_process(<span class="keyword">struct</span> tcp_pcb *pcb)</div>
<div class="line"><a name="l00710"></a><span class="lineno"> 710</span> {</div>
<div class="line"><a name="l00711"></a><span class="lineno"> 711</span>  <span class="keyword">struct </span>tcp_seg *rseg;</div>
<div class="line"><a name="l00712"></a><span class="lineno"> 712</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> acceptable = 0;</div>
<div class="line"><a name="l00713"></a><span class="lineno"> 713</span>  <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err;</div>
<div class="line"><a name="l00714"></a><span class="lineno"> 714</span>  </div>
<div class="line"><a name="l00715"></a><span class="lineno"> 715</span>  err = <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa26c163b80b1f6786ca81dadc14b00fb">ERR_OK</a>;</div>
<div class="line"><a name="l00716"></a><span class="lineno"> 716</span>  </div>
<div class="line"><a name="l00717"></a><span class="lineno"> 717</span>  <span class="comment">/* Process incoming RST segments. */</span></div>
<div class="line"><a name="l00718"></a><span class="lineno"> 718</span>  <span class="keywordflow">if</span> (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5ca559def464ef20d8b1f7d32f2f160d">TCP_RST</a>) {</div>
<div class="line"><a name="l00719"></a><span class="lineno"> 719</span>  <span class="comment">/* First, determine if the reset is acceptable. */</span></div>
<div class="line"><a name="l00720"></a><span class="lineno"> 720</span>  <span class="keywordflow">if</span> (pcb->state == SYN_SENT) {</div>
<div class="line"><a name="l00721"></a><span class="lineno"> 721</span>  <span class="comment">/* "In the SYN-SENT state (a RST received in response to an initial SYN),</span></div>
<div class="line"><a name="l00722"></a><span class="lineno"> 722</span> <span class="comment"> the RST is acceptable if the ACK field acknowledges the SYN." */</span></div>
<div class="line"><a name="l00723"></a><span class="lineno"> 723</span>  <span class="keywordflow">if</span> (ackno == pcb->snd_nxt) {</div>
<div class="line"><a name="l00724"></a><span class="lineno"> 724</span>  acceptable = 1;</div>
<div class="line"><a name="l00725"></a><span class="lineno"> 725</span>  }</div>
<div class="line"><a name="l00726"></a><span class="lineno"> 726</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00727"></a><span class="lineno"> 727</span>  <span class="comment">/* "In all states except SYN-SENT, all reset (RST) segments are validated</span></div>
<div class="line"><a name="l00728"></a><span class="lineno"> 728</span> <span class="comment"> by checking their SEQ-fields." */</span></div>
<div class="line"><a name="l00729"></a><span class="lineno"> 729</span>  <span class="keywordflow">if</span> (seqno == pcb->rcv_nxt) {</div>
<div class="line"><a name="l00730"></a><span class="lineno"> 730</span>  acceptable = 1;</div>
<div class="line"><a name="l00731"></a><span class="lineno"> 731</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (TCP_SEQ_BETWEEN(seqno, pcb->rcv_nxt,</div>
<div class="line"><a name="l00732"></a><span class="lineno"> 732</span>  pcb->rcv_nxt + pcb->rcv_wnd)) {</div>
<div class="line"><a name="l00733"></a><span class="lineno"> 733</span>  <span class="comment">/* If the sequence number is inside the window, we only send an ACK</span></div>
<div class="line"><a name="l00734"></a><span class="lineno"> 734</span> <span class="comment"> and wait for a re-send with matching sequence number.</span></div>
<div class="line"><a name="l00735"></a><span class="lineno"> 735</span> <span class="comment"> This violates RFC 793, but is required to protection against</span></div>
<div class="line"><a name="l00736"></a><span class="lineno"> 736</span> <span class="comment"> CVE-2004-0230 (RST spoofing attack). */</span></div>
<div class="line"><a name="l00737"></a><span class="lineno"> 737</span>  tcp_ack_now(pcb);</div>
<div class="line"><a name="l00738"></a><span class="lineno"> 738</span>  }</div>
<div class="line"><a name="l00739"></a><span class="lineno"> 739</span>  }</div>
<div class="line"><a name="l00740"></a><span class="lineno"> 740</span>  </div>
<div class="line"><a name="l00741"></a><span class="lineno"> 741</span>  <span class="keywordflow">if</span> (acceptable) {</div>
<div class="line"><a name="l00742"></a><span class="lineno"> 742</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_process: Connection RESET\n"</span>));</div>
<div class="line"><a name="l00743"></a><span class="lineno"> 743</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_input: pcb->state != CLOSED"</span>, pcb->state != CLOSED);</div>
<div class="line"><a name="l00744"></a><span class="lineno"> 744</span>  recv_flags |= TF_RESET;</div>
<div class="line"><a name="l00745"></a><span class="lineno"> 745</span>  pcb->flags &= ~TF_ACK_DELAY;</div>
<div class="line"><a name="l00746"></a><span class="lineno"> 746</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadca759030525f1768a23dc086a5fd45b4e5">ERR_RST</a>;</div>
<div class="line"><a name="l00747"></a><span class="lineno"> 747</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00748"></a><span class="lineno"> 748</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_process: unacceptable reset seqno %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" rcv_nxt %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l00749"></a><span class="lineno"> 749</span>  seqno, pcb->rcv_nxt));</div>
<div class="line"><a name="l00750"></a><span class="lineno"> 750</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a4f43bb8a430c7a52a1ad5086d3f2803c">TCP_DEBUG</a>, (<span class="stringliteral">"tcp_process: unacceptable reset seqno %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" rcv_nxt %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l00751"></a><span class="lineno"> 751</span>  seqno, pcb->rcv_nxt));</div>
<div class="line"><a name="l00752"></a><span class="lineno"> 752</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa26c163b80b1f6786ca81dadc14b00fb">ERR_OK</a>;</div>
<div class="line"><a name="l00753"></a><span class="lineno"> 753</span>  }</div>
<div class="line"><a name="l00754"></a><span class="lineno"> 754</span>  }</div>
<div class="line"><a name="l00755"></a><span class="lineno"> 755</span>  </div>
<div class="line"><a name="l00756"></a><span class="lineno"> 756</span>  <span class="keywordflow">if</span> ((flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a>) && (pcb->state != SYN_SENT && pcb->state != SYN_RCVD)) {</div>
<div class="line"><a name="l00757"></a><span class="lineno"> 757</span>  <span class="comment">/* Cope with new connection attempt after remote end crashed */</span></div>
<div class="line"><a name="l00758"></a><span class="lineno"> 758</span>  tcp_ack_now(pcb);</div>
<div class="line"><a name="l00759"></a><span class="lineno"> 759</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa26c163b80b1f6786ca81dadc14b00fb">ERR_OK</a>;</div>
<div class="line"><a name="l00760"></a><span class="lineno"> 760</span>  }</div>
<div class="line"><a name="l00761"></a><span class="lineno"> 761</span>  </div>
<div class="line"><a name="l00762"></a><span class="lineno"> 762</span>  <span class="keywordflow">if</span> ((pcb->flags & TF_RXCLOSED) == 0) {</div>
<div class="line"><a name="l00763"></a><span class="lineno"> 763</span>  <span class="comment">/* Update the PCB (in)activity timer unless rx is closed (see tcp_shutdown) */</span></div>
<div class="line"><a name="l00764"></a><span class="lineno"> 764</span>  pcb->tmr = tcp_ticks;</div>
<div class="line"><a name="l00765"></a><span class="lineno"> 765</span>  }</div>
<div class="line"><a name="l00766"></a><span class="lineno"> 766</span>  pcb->keep_cnt_sent = 0;</div>
<div class="line"><a name="l00767"></a><span class="lineno"> 767</span>  </div>
<div class="line"><a name="l00768"></a><span class="lineno"> 768</span>  tcp_parseopt(pcb);</div>
<div class="line"><a name="l00769"></a><span class="lineno"> 769</span>  </div>
<div class="line"><a name="l00770"></a><span class="lineno"> 770</span>  <span class="comment">/* Do different things depending on the TCP state. */</span></div>
<div class="line"><a name="l00771"></a><span class="lineno"> 771</span>  <span class="keywordflow">switch</span> (pcb->state) {</div>
<div class="line"><a name="l00772"></a><span class="lineno"> 772</span>  <span class="keywordflow">case</span> SYN_SENT:</div>
<div class="line"><a name="l00773"></a><span class="lineno"> 773</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"SYN-SENT: ackno %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" pcb->snd_nxt %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" unacked %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">"\n"</span>, ackno,</div>
<div class="line"><a name="l00774"></a><span class="lineno"> 774</span>  pcb->snd_nxt, <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(pcb->unacked->tcphdr->seqno)));</div>
<div class="line"><a name="l00775"></a><span class="lineno"> 775</span>  <span class="comment">/* received SYN ACK with expected sequence number? */</span></div>
<div class="line"><a name="l00776"></a><span class="lineno"> 776</span>  <span class="keywordflow">if</span> ((flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>) && (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a>)</div>
<div class="line"><a name="l00777"></a><span class="lineno"> 777</span>  && (ackno == pcb->lastack + 1)) {</div>
<div class="line"><a name="l00778"></a><span class="lineno"> 778</span>  pcb->rcv_nxt = seqno + 1;</div>
<div class="line"><a name="l00779"></a><span class="lineno"> 779</span>  pcb->rcv_ann_right_edge = pcb->rcv_nxt;</div>
<div class="line"><a name="l00780"></a><span class="lineno"> 780</span>  pcb->lastack = ackno;</div>
<div class="line"><a name="l00781"></a><span class="lineno"> 781</span>  pcb->snd_wnd = tcphdr->wnd;</div>
<div class="line"><a name="l00782"></a><span class="lineno"> 782</span>  pcb->snd_wnd_max = pcb->snd_wnd;</div>
<div class="line"><a name="l00783"></a><span class="lineno"> 783</span>  pcb->snd_wl1 = seqno - 1; <span class="comment">/* initialise to seqno - 1 to force window update */</span></div>
<div class="line"><a name="l00784"></a><span class="lineno"> 784</span>  pcb->state = ESTABLISHED;</div>
<div class="line"><a name="l00785"></a><span class="lineno"> 785</span>  </div>
<div class="line"><a name="l00786"></a><span class="lineno"> 786</span> <span class="preprocessor">#if TCP_CALCULATE_EFF_SEND_MSS</span></div>
<div class="line"><a name="l00787"></a><span class="lineno"> 787</span>  pcb->mss = tcp_eff_send_mss(pcb->mss, &pcb->local_ip, &pcb->remote_ip);</div>
<div class="line"><a name="l00788"></a><span class="lineno"> 788</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CALCULATE_EFF_SEND_MSS */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00789"></a><span class="lineno"> 789</span>  </div>
<div class="line"><a name="l00790"></a><span class="lineno"> 790</span>  pcb->cwnd = LWIP_TCP_CALC_INITIAL_CWND(pcb->mss);</div>
<div class="line"><a name="l00791"></a><span class="lineno"> 791</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a66df03d8192cd978d3321a9d68bf5411">TCP_CWND_DEBUG</a>, (<span class="stringliteral">"tcp_process (SENT): cwnd %"</span>TCPWNDSIZE_F</div>
<div class="line"><a name="l00792"></a><span class="lineno"> 792</span>  <span class="stringliteral">" ssthresh %"</span>TCPWNDSIZE_F<span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l00793"></a><span class="lineno"> 793</span>  pcb->cwnd, pcb->ssthresh));</div>
<div class="line"><a name="l00794"></a><span class="lineno"> 794</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"pcb->snd_queuelen > 0"</span>, (pcb->snd_queuelen > 0));</div>
<div class="line"><a name="l00795"></a><span class="lineno"> 795</span>  --pcb->snd_queuelen;</div>
<div class="line"><a name="l00796"></a><span class="lineno"> 796</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#ae7980c7f8eb45cd411bf410ff0a3fc55">TCP_QLEN_DEBUG</a>, (<span class="stringliteral">"tcp_process: SYN-SENT --queuelen %"</span>TCPWNDSIZE_F<span class="stringliteral">"\n"</span>, (tcpwnd_size_t)pcb->snd_queuelen));</div>
<div class="line"><a name="l00797"></a><span class="lineno"> 797</span>  rseg = pcb->unacked;</div>
<div class="line"><a name="l00798"></a><span class="lineno"> 798</span>  <span class="keywordflow">if</span> (rseg == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00799"></a><span class="lineno"> 799</span>  <span class="comment">/* might happen if tcp_output fails in tcp_rexmit_rto()</span></div>
<div class="line"><a name="l00800"></a><span class="lineno"> 800</span> <span class="comment"> in which case the segment is on the unsent list */</span></div>
<div class="line"><a name="l00801"></a><span class="lineno"> 801</span>  rseg = pcb->unsent;</div>
<div class="line"><a name="l00802"></a><span class="lineno"> 802</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"no segment to free"</span>, rseg != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);</div>
<div class="line"><a name="l00803"></a><span class="lineno"> 803</span>  pcb->unsent = rseg->next;</div>
<div class="line"><a name="l00804"></a><span class="lineno"> 804</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00805"></a><span class="lineno"> 805</span>  pcb->unacked = rseg->next;</div>
<div class="line"><a name="l00806"></a><span class="lineno"> 806</span>  }</div>
<div class="line"><a name="l00807"></a><span class="lineno"> 807</span>  tcp_seg_free(rseg);</div>
<div class="line"><a name="l00808"></a><span class="lineno"> 808</span>  </div>
<div class="line"><a name="l00809"></a><span class="lineno"> 809</span>  <span class="comment">/* If there's nothing left to acknowledge, stop the retransmit</span></div>
<div class="line"><a name="l00810"></a><span class="lineno"> 810</span> <span class="comment"> timer, otherwise reset it to start again */</span></div>
<div class="line"><a name="l00811"></a><span class="lineno"> 811</span>  <span class="keywordflow">if</span> (pcb->unacked == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00812"></a><span class="lineno"> 812</span>  pcb->rtime = -1;</div>
<div class="line"><a name="l00813"></a><span class="lineno"> 813</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00814"></a><span class="lineno"> 814</span>  pcb->rtime = 0;</div>
<div class="line"><a name="l00815"></a><span class="lineno"> 815</span>  pcb->nrtx = 0;</div>
<div class="line"><a name="l00816"></a><span class="lineno"> 816</span>  }</div>
<div class="line"><a name="l00817"></a><span class="lineno"> 817</span>  </div>
<div class="line"><a name="l00818"></a><span class="lineno"> 818</span>  <span class="comment">/* Call the user specified function to call when successfully</span></div>
<div class="line"><a name="l00819"></a><span class="lineno"> 819</span> <span class="comment"> * connected. */</span></div>
<div class="line"><a name="l00820"></a><span class="lineno"> 820</span>  TCP_EVENT_CONNECTED(pcb, <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa26c163b80b1f6786ca81dadc14b00fb">ERR_OK</a>, err);</div>
<div class="line"><a name="l00821"></a><span class="lineno"> 821</span>  <span class="keywordflow">if</span> (err == <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaf316b2c5eee4079820f7100849115142">ERR_ABRT</a>) {</div>
<div class="line"><a name="l00822"></a><span class="lineno"> 822</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaf316b2c5eee4079820f7100849115142">ERR_ABRT</a>;</div>
<div class="line"><a name="l00823"></a><span class="lineno"> 823</span>  }</div>
<div class="line"><a name="l00824"></a><span class="lineno"> 824</span>  tcp_ack_now(pcb);</div>
<div class="line"><a name="l00825"></a><span class="lineno"> 825</span>  }</div>
<div class="line"><a name="l00826"></a><span class="lineno"> 826</span>  <span class="comment">/* received ACK? possibly a half-open connection */</span></div>
<div class="line"><a name="l00827"></a><span class="lineno"> 827</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>) {</div>
<div class="line"><a name="l00828"></a><span class="lineno"> 828</span>  <span class="comment">/* send a RST to bring the other side in a non-synchronized state. */</span></div>
<div class="line"><a name="l00829"></a><span class="lineno"> 829</span>  tcp_rst(ackno, seqno + tcplen, <a class="code" href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a>(),</div>
<div class="line"><a name="l00830"></a><span class="lineno"> 830</span>  <a class="code" href="../../da/d2f/ip_8h.html#a4e35b7692c228c98e738892f0a215647">ip_current_src_addr</a>(), tcphdr->dest, tcphdr->src);</div>
<div class="line"><a name="l00831"></a><span class="lineno"> 831</span>  <span class="comment">/* Resend SYN immediately (don't wait for rto timeout) to establish</span></div>
<div class="line"><a name="l00832"></a><span class="lineno"> 832</span> <span class="comment"> connection faster, but do not send more SYNs than we otherwise would</span></div>
<div class="line"><a name="l00833"></a><span class="lineno"> 833</span> <span class="comment"> have, or we might get caught in a loop on loopback interfaces. */</span></div>
<div class="line"><a name="l00834"></a><span class="lineno"> 834</span>  <span class="keywordflow">if</span> (pcb->nrtx < <a class="code" href="../../d2/d78/lwipopts_8h.html#a50b434a8541a4813f7b27f576c05d1b6">TCP_SYNMAXRTX</a>) {</div>
<div class="line"><a name="l00835"></a><span class="lineno"> 835</span>  pcb->rtime = 0;</div>
<div class="line"><a name="l00836"></a><span class="lineno"> 836</span>  tcp_rexmit_rto(pcb);</div>
<div class="line"><a name="l00837"></a><span class="lineno"> 837</span>  }</div>
<div class="line"><a name="l00838"></a><span class="lineno"> 838</span>  }</div>
<div class="line"><a name="l00839"></a><span class="lineno"> 839</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00840"></a><span class="lineno"> 840</span>  <span class="keywordflow">case</span> SYN_RCVD:</div>
<div class="line"><a name="l00841"></a><span class="lineno"> 841</span>  <span class="keywordflow">if</span> (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>) {</div>
<div class="line"><a name="l00842"></a><span class="lineno"> 842</span>  <span class="comment">/* expected ACK number? */</span></div>
<div class="line"><a name="l00843"></a><span class="lineno"> 843</span>  <span class="keywordflow">if</span> (TCP_SEQ_BETWEEN(ackno, pcb->lastack+1, pcb->snd_nxt)) {</div>
<div class="line"><a name="l00844"></a><span class="lineno"> 844</span>  pcb->state = ESTABLISHED;</div>
<div class="line"><a name="l00845"></a><span class="lineno"> 845</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a4f43bb8a430c7a52a1ad5086d3f2803c">TCP_DEBUG</a>, (<span class="stringliteral">"TCP connection established %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" -> %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">".\n"</span>, inseg.tcphdr->src, inseg.tcphdr->dest));</div>
<div class="line"><a name="l00846"></a><span class="lineno"> 846</span> <span class="preprocessor">#if LWIP_CALLBACK_API || TCP_LISTEN_BACKLOG</span></div>
<div class="line"><a name="l00847"></a><span class="lineno"> 847</span> <span class="preprocessor">#if LWIP_CALLBACK_API</span></div>
<div class="line"><a name="l00848"></a><span class="lineno"> 848</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"pcb->listener->accept != NULL"</span>,</div>
<div class="line"><a name="l00849"></a><span class="lineno"> 849</span>  (pcb->listener == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) || (pcb->listener->accept != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>));</div>
<div class="line"><a name="l00850"></a><span class="lineno"> 850</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00851"></a><span class="lineno"> 851</span>  <span class="keywordflow">if</span> (pcb->listener == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00852"></a><span class="lineno"> 852</span>  <span class="comment">/* listen pcb might be closed by now */</span></div>
<div class="line"><a name="l00853"></a><span class="lineno"> 853</span>  err = <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa9a1c5a6fdeed0aad7fe41d538482bbd">ERR_VAL</a>;</div>
<div class="line"><a name="l00854"></a><span class="lineno"> 854</span>  } <span class="keywordflow">else</span></div>
<div class="line"><a name="l00855"></a><span class="lineno"> 855</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_CALLBACK_API || TCP_LISTEN_BACKLOG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00856"></a><span class="lineno"> 856</span>  {</div>
<div class="line"><a name="l00857"></a><span class="lineno"> 857</span>  tcp_backlog_accepted(pcb);</div>
<div class="line"><a name="l00858"></a><span class="lineno"> 858</span>  <span class="comment">/* Call the accept function. */</span></div>
<div class="line"><a name="l00859"></a><span class="lineno"> 859</span>  TCP_EVENT_ACCEPT(pcb->listener, pcb, pcb->callback_arg, <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa26c163b80b1f6786ca81dadc14b00fb">ERR_OK</a>, err);</div>
<div class="line"><a name="l00860"></a><span class="lineno"> 860</span>  }</div>
<div class="line"><a name="l00861"></a><span class="lineno"> 861</span>  <span class="keywordflow">if</span> (err != <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa26c163b80b1f6786ca81dadc14b00fb">ERR_OK</a>) {</div>
<div class="line"><a name="l00862"></a><span class="lineno"> 862</span>  <span class="comment">/* If the accept function returns with an error, we abort</span></div>
<div class="line"><a name="l00863"></a><span class="lineno"> 863</span> <span class="comment"> * the connection. */</span></div>
<div class="line"><a name="l00864"></a><span class="lineno"> 864</span>  <span class="comment">/* Already aborted? */</span></div>
<div class="line"><a name="l00865"></a><span class="lineno"> 865</span>  <span class="keywordflow">if</span> (err != <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaf316b2c5eee4079820f7100849115142">ERR_ABRT</a>) {</div>
<div class="line"><a name="l00866"></a><span class="lineno"> 866</span>  tcp_abort(pcb);</div>
<div class="line"><a name="l00867"></a><span class="lineno"> 867</span>  }</div>
<div class="line"><a name="l00868"></a><span class="lineno"> 868</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaf316b2c5eee4079820f7100849115142">ERR_ABRT</a>;</div>
<div class="line"><a name="l00869"></a><span class="lineno"> 869</span>  }</div>
<div class="line"><a name="l00870"></a><span class="lineno"> 870</span>  <span class="comment">/* If there was any data contained within this ACK,</span></div>
<div class="line"><a name="l00871"></a><span class="lineno"> 871</span> <span class="comment"> * we'd better pass it on to the application as well. */</span></div>
<div class="line"><a name="l00872"></a><span class="lineno"> 872</span>  tcp_receive(pcb);</div>
<div class="line"><a name="l00873"></a><span class="lineno"> 873</span>  </div>
<div class="line"><a name="l00874"></a><span class="lineno"> 874</span>  <span class="comment">/* Prevent ACK for SYN to generate a sent event */</span></div>
<div class="line"><a name="l00875"></a><span class="lineno"> 875</span>  <span class="keywordflow">if</span> (recv_acked != 0) {</div>
<div class="line"><a name="l00876"></a><span class="lineno"> 876</span>  recv_acked--;</div>
<div class="line"><a name="l00877"></a><span class="lineno"> 877</span>  }</div>
<div class="line"><a name="l00878"></a><span class="lineno"> 878</span>  </div>
<div class="line"><a name="l00879"></a><span class="lineno"> 879</span>  pcb->cwnd = LWIP_TCP_CALC_INITIAL_CWND(pcb->mss);</div>
<div class="line"><a name="l00880"></a><span class="lineno"> 880</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a66df03d8192cd978d3321a9d68bf5411">TCP_CWND_DEBUG</a>, (<span class="stringliteral">"tcp_process (SYN_RCVD): cwnd %"</span>TCPWNDSIZE_F</div>
<div class="line"><a name="l00881"></a><span class="lineno"> 881</span>  <span class="stringliteral">" ssthresh %"</span>TCPWNDSIZE_F<span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l00882"></a><span class="lineno"> 882</span>  pcb->cwnd, pcb->ssthresh));</div>
<div class="line"><a name="l00883"></a><span class="lineno"> 883</span>  </div>
<div class="line"><a name="l00884"></a><span class="lineno"> 884</span>  <span class="keywordflow">if</span> (recv_flags & TF_GOT_FIN) {</div>
<div class="line"><a name="l00885"></a><span class="lineno"> 885</span>  tcp_ack_now(pcb);</div>
<div class="line"><a name="l00886"></a><span class="lineno"> 886</span>  pcb->state = CLOSE_WAIT;</div>
<div class="line"><a name="l00887"></a><span class="lineno"> 887</span>  }</div>
<div class="line"><a name="l00888"></a><span class="lineno"> 888</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00889"></a><span class="lineno"> 889</span>  <span class="comment">/* incorrect ACK number, send RST */</span></div>
<div class="line"><a name="l00890"></a><span class="lineno"> 890</span>  tcp_rst(ackno, seqno + tcplen, <a class="code" href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a>(),</div>
<div class="line"><a name="l00891"></a><span class="lineno"> 891</span>  <a class="code" href="../../da/d2f/ip_8h.html#a4e35b7692c228c98e738892f0a215647">ip_current_src_addr</a>(), tcphdr->dest, tcphdr->src);</div>
<div class="line"><a name="l00892"></a><span class="lineno"> 892</span>  }</div>
<div class="line"><a name="l00893"></a><span class="lineno"> 893</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a>) && (seqno == pcb->rcv_nxt - 1)) {</div>
<div class="line"><a name="l00894"></a><span class="lineno"> 894</span>  <span class="comment">/* Looks like another copy of the SYN - retransmit our SYN-ACK */</span></div>
<div class="line"><a name="l00895"></a><span class="lineno"> 895</span>  tcp_rexmit(pcb);</div>
<div class="line"><a name="l00896"></a><span class="lineno"> 896</span>  }</div>
<div class="line"><a name="l00897"></a><span class="lineno"> 897</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00898"></a><span class="lineno"> 898</span>  <span class="keywordflow">case</span> CLOSE_WAIT:</div>
<div class="line"><a name="l00899"></a><span class="lineno"> 899</span>  <span class="comment">/* FALLTHROUGH */</span></div>
<div class="line"><a name="l00900"></a><span class="lineno"> 900</span>  <span class="keywordflow">case</span> ESTABLISHED:</div>
<div class="line"><a name="l00901"></a><span class="lineno"> 901</span>  tcp_receive(pcb);</div>
<div class="line"><a name="l00902"></a><span class="lineno"> 902</span>  <span class="keywordflow">if</span> (recv_flags & TF_GOT_FIN) { <span class="comment">/* passive close */</span></div>
<div class="line"><a name="l00903"></a><span class="lineno"> 903</span>  tcp_ack_now(pcb);</div>
<div class="line"><a name="l00904"></a><span class="lineno"> 904</span>  pcb->state = CLOSE_WAIT;</div>
<div class="line"><a name="l00905"></a><span class="lineno"> 905</span>  }</div>
<div class="line"><a name="l00906"></a><span class="lineno"> 906</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00907"></a><span class="lineno"> 907</span>  <span class="keywordflow">case</span> FIN_WAIT_1:</div>
<div class="line"><a name="l00908"></a><span class="lineno"> 908</span>  tcp_receive(pcb);</div>
<div class="line"><a name="l00909"></a><span class="lineno"> 909</span>  <span class="keywordflow">if</span> (recv_flags & TF_GOT_FIN) {</div>
<div class="line"><a name="l00910"></a><span class="lineno"> 910</span>  <span class="keywordflow">if</span> ((flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>) && (ackno == pcb->snd_nxt) &&</div>
<div class="line"><a name="l00911"></a><span class="lineno"> 911</span>  pcb->unsent == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00912"></a><span class="lineno"> 912</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a4f43bb8a430c7a52a1ad5086d3f2803c">TCP_DEBUG</a>,</div>
<div class="line"><a name="l00913"></a><span class="lineno"> 913</span>  (<span class="stringliteral">"TCP connection closed: FIN_WAIT_1 %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" -> %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">".\n"</span>, inseg.tcphdr->src, inseg.tcphdr->dest));</div>
<div class="line"><a name="l00914"></a><span class="lineno"> 914</span>  tcp_ack_now(pcb);</div>
<div class="line"><a name="l00915"></a><span class="lineno"> 915</span>  tcp_pcb_purge(pcb);</div>
<div class="line"><a name="l00916"></a><span class="lineno"> 916</span>  TCP_RMV_ACTIVE(pcb);</div>
<div class="line"><a name="l00917"></a><span class="lineno"> 917</span>  pcb->state = TIME_WAIT;</div>
<div class="line"><a name="l00918"></a><span class="lineno"> 918</span>  TCP_REG(&tcp_tw_pcbs, pcb);</div>
<div class="line"><a name="l00919"></a><span class="lineno"> 919</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00920"></a><span class="lineno"> 920</span>  tcp_ack_now(pcb);</div>
<div class="line"><a name="l00921"></a><span class="lineno"> 921</span>  pcb->state = CLOSING;</div>
<div class="line"><a name="l00922"></a><span class="lineno"> 922</span>  }</div>
<div class="line"><a name="l00923"></a><span class="lineno"> 923</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>) && (ackno == pcb->snd_nxt) &&</div>
<div class="line"><a name="l00924"></a><span class="lineno"> 924</span>  pcb->unsent == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00925"></a><span class="lineno"> 925</span>  pcb->state = FIN_WAIT_2;</div>
<div class="line"><a name="l00926"></a><span class="lineno"> 926</span>  }</div>
<div class="line"><a name="l00927"></a><span class="lineno"> 927</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00928"></a><span class="lineno"> 928</span>  <span class="keywordflow">case</span> FIN_WAIT_2:</div>
<div class="line"><a name="l00929"></a><span class="lineno"> 929</span>  tcp_receive(pcb);</div>
<div class="line"><a name="l00930"></a><span class="lineno"> 930</span>  <span class="keywordflow">if</span> (recv_flags & TF_GOT_FIN) {</div>
<div class="line"><a name="l00931"></a><span class="lineno"> 931</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a4f43bb8a430c7a52a1ad5086d3f2803c">TCP_DEBUG</a>, (<span class="stringliteral">"TCP connection closed: FIN_WAIT_2 %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" -> %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">".\n"</span>, inseg.tcphdr->src, inseg.tcphdr->dest));</div>
<div class="line"><a name="l00932"></a><span class="lineno"> 932</span>  tcp_ack_now(pcb);</div>
<div class="line"><a name="l00933"></a><span class="lineno"> 933</span>  tcp_pcb_purge(pcb);</div>
<div class="line"><a name="l00934"></a><span class="lineno"> 934</span>  TCP_RMV_ACTIVE(pcb);</div>
<div class="line"><a name="l00935"></a><span class="lineno"> 935</span>  pcb->state = TIME_WAIT;</div>
<div class="line"><a name="l00936"></a><span class="lineno"> 936</span>  TCP_REG(&tcp_tw_pcbs, pcb);</div>
<div class="line"><a name="l00937"></a><span class="lineno"> 937</span>  }</div>
<div class="line"><a name="l00938"></a><span class="lineno"> 938</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00939"></a><span class="lineno"> 939</span>  <span class="keywordflow">case</span> CLOSING:</div>
<div class="line"><a name="l00940"></a><span class="lineno"> 940</span>  tcp_receive(pcb);</div>
<div class="line"><a name="l00941"></a><span class="lineno"> 941</span>  <span class="keywordflow">if</span> ((flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>) && ackno == pcb->snd_nxt && pcb->unsent == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00942"></a><span class="lineno"> 942</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a4f43bb8a430c7a52a1ad5086d3f2803c">TCP_DEBUG</a>, (<span class="stringliteral">"TCP connection closed: CLOSING %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" -> %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">".\n"</span>, inseg.tcphdr->src, inseg.tcphdr->dest));</div>
<div class="line"><a name="l00943"></a><span class="lineno"> 943</span>  tcp_pcb_purge(pcb);</div>
<div class="line"><a name="l00944"></a><span class="lineno"> 944</span>  TCP_RMV_ACTIVE(pcb);</div>
<div class="line"><a name="l00945"></a><span class="lineno"> 945</span>  pcb->state = TIME_WAIT;</div>
<div class="line"><a name="l00946"></a><span class="lineno"> 946</span>  TCP_REG(&tcp_tw_pcbs, pcb);</div>
<div class="line"><a name="l00947"></a><span class="lineno"> 947</span>  }</div>
<div class="line"><a name="l00948"></a><span class="lineno"> 948</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00949"></a><span class="lineno"> 949</span>  <span class="keywordflow">case</span> LAST_ACK:</div>
<div class="line"><a name="l00950"></a><span class="lineno"> 950</span>  tcp_receive(pcb);</div>
<div class="line"><a name="l00951"></a><span class="lineno"> 951</span>  <span class="keywordflow">if</span> ((flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>) && ackno == pcb->snd_nxt && pcb->unsent == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00952"></a><span class="lineno"> 952</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a4f43bb8a430c7a52a1ad5086d3f2803c">TCP_DEBUG</a>, (<span class="stringliteral">"TCP connection closed: LAST_ACK %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" -> %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">".\n"</span>, inseg.tcphdr->src, inseg.tcphdr->dest));</div>
<div class="line"><a name="l00953"></a><span class="lineno"> 953</span>  <span class="comment">/* bugfix #21699: don't set pcb->state to CLOSED here or we risk leaking segments */</span></div>
<div class="line"><a name="l00954"></a><span class="lineno"> 954</span>  recv_flags |= TF_CLOSED;</div>
<div class="line"><a name="l00955"></a><span class="lineno"> 955</span>  }</div>
<div class="line"><a name="l00956"></a><span class="lineno"> 956</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00957"></a><span class="lineno"> 957</span>  <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l00958"></a><span class="lineno"> 958</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00959"></a><span class="lineno"> 959</span>  }</div>
<div class="line"><a name="l00960"></a><span class="lineno"> 960</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa26c163b80b1f6786ca81dadc14b00fb">ERR_OK</a>;</div>
<div class="line"><a name="l00961"></a><span class="lineno"> 961</span> }</div>
<div class="line"><a name="l00962"></a><span class="lineno"> 962</span>  </div>
<div class="line"><a name="l00963"></a><span class="lineno"> 963</span> <span class="preprocessor">#if TCP_QUEUE_OOSEQ</span></div>
<div class="line"><a name="l00964"></a><span class="lineno"> 964</span>  </div>
<div class="line"><a name="l00969"></a><span class="lineno"> 969</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00970"></a><span class="lineno"> 970</span> tcp_oos_insert_segment(<span class="keyword">struct</span> tcp_seg *cseg, <span class="keyword">struct</span> tcp_seg *next)</div>
<div class="line"><a name="l00971"></a><span class="lineno"> 971</span> {</div>
<div class="line"><a name="l00972"></a><span class="lineno"> 972</span>  <span class="keyword">struct </span>tcp_seg *old_seg;</div>
<div class="line"><a name="l00973"></a><span class="lineno"> 973</span>  </div>
<div class="line"><a name="l00974"></a><span class="lineno"> 974</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(cseg->tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) {</div>
<div class="line"><a name="l00975"></a><span class="lineno"> 975</span>  <span class="comment">/* received segment overlaps all following segments */</span></div>
<div class="line"><a name="l00976"></a><span class="lineno"> 976</span>  tcp_segs_free(next);</div>
<div class="line"><a name="l00977"></a><span class="lineno"> 977</span>  next = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00978"></a><span class="lineno"> 978</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00979"></a><span class="lineno"> 979</span>  <span class="comment">/* delete some following segments</span></div>
<div class="line"><a name="l00980"></a><span class="lineno"> 980</span> <span class="comment"> oos queue may have segments with FIN flag */</span></div>
<div class="line"><a name="l00981"></a><span class="lineno"> 981</span>  <span class="keywordflow">while</span> (next &&</div>
<div class="line"><a name="l00982"></a><span class="lineno"> 982</span>  TCP_SEQ_GEQ((seqno + cseg->len),</div>
<div class="line"><a name="l00983"></a><span class="lineno"> 983</span>  (next->tcphdr->seqno + next->len))) {</div>
<div class="line"><a name="l00984"></a><span class="lineno"> 984</span>  <span class="comment">/* cseg with FIN already processed */</span></div>
<div class="line"><a name="l00985"></a><span class="lineno"> 985</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(next->tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) {</div>
<div class="line"><a name="l00986"></a><span class="lineno"> 986</span>  <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a42432f2dde6716ecb0087ccbc47cc75b">TCPH_SET_FLAG</a>(cseg->tcphdr, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>);</div>
<div class="line"><a name="l00987"></a><span class="lineno"> 987</span>  }</div>
<div class="line"><a name="l00988"></a><span class="lineno"> 988</span>  old_seg = next;</div>
<div class="line"><a name="l00989"></a><span class="lineno"> 989</span>  next = next->next;</div>
<div class="line"><a name="l00990"></a><span class="lineno"> 990</span>  tcp_seg_free(old_seg);</div>
<div class="line"><a name="l00991"></a><span class="lineno"> 991</span>  }</div>
<div class="line"><a name="l00992"></a><span class="lineno"> 992</span>  <span class="keywordflow">if</span> (next &&</div>
<div class="line"><a name="l00993"></a><span class="lineno"> 993</span>  TCP_SEQ_GT(seqno + cseg->len, next->tcphdr->seqno)) {</div>
<div class="line"><a name="l00994"></a><span class="lineno"> 994</span>  <span class="comment">/* We need to trim the incoming segment. */</span></div>
<div class="line"><a name="l00995"></a><span class="lineno"> 995</span>  cseg->len = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)(next->tcphdr->seqno - seqno);</div>
<div class="line"><a name="l00996"></a><span class="lineno"> 996</span>  <a class="code" href="../../d7/d05/group__pbuf.html#ga50abfe830a33a1a47a562febee66015d">pbuf_realloc</a>(cseg->p, cseg->len);</div>
<div class="line"><a name="l00997"></a><span class="lineno"> 997</span>  }</div>
<div class="line"><a name="l00998"></a><span class="lineno"> 998</span>  }</div>
<div class="line"><a name="l00999"></a><span class="lineno"> 999</span>  cseg->next = next;</div>
<div class="line"><a name="l01000"></a><span class="lineno"> 1000</span> }</div>
<div class="line"><a name="l01001"></a><span class="lineno"> 1001</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_QUEUE_OOSEQ */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01002"></a><span class="lineno"> 1002</span>  </div>
<div class="line"><a name="l01015"></a><span class="lineno"> 1015</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l01016"></a><span class="lineno"> 1016</span> tcp_receive(<span class="keyword">struct</span> tcp_pcb *pcb)</div>
<div class="line"><a name="l01017"></a><span class="lineno"> 1017</span> {</div>
<div class="line"><a name="l01018"></a><span class="lineno"> 1018</span>  <span class="keyword">struct </span>tcp_seg *next;</div>
<div class="line"><a name="l01019"></a><span class="lineno"> 1019</span> <span class="preprocessor">#if TCP_QUEUE_OOSEQ</span></div>
<div class="line"><a name="l01020"></a><span class="lineno"> 1020</span>  <span class="keyword">struct </span>tcp_seg *prev, *cseg;</div>
<div class="line"><a name="l01021"></a><span class="lineno"> 1021</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_QUEUE_OOSEQ */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01022"></a><span class="lineno"> 1022</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga10f9a3d7baef58ccc23228c3bd29c1fb">s32_t</a> off;</div>
<div class="line"><a name="l01023"></a><span class="lineno"> 1023</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#gacf46f4df0ebab84edebcb69967fdf86b">s16_t</a> m;</div>
<div class="line"><a name="l01024"></a><span class="lineno"> 1024</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> right_wnd_edge;</div>
<div class="line"><a name="l01025"></a><span class="lineno"> 1025</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> new_tot_len;</div>
<div class="line"><a name="l01026"></a><span class="lineno"> 1026</span>  <span class="keywordtype">int</span> found_dupack = 0;</div>
<div class="line"><a name="l01027"></a><span class="lineno"> 1027</span> <span class="preprocessor">#if TCP_OOSEQ_MAX_BYTES || TCP_OOSEQ_MAX_PBUFS</span></div>
<div class="line"><a name="l01028"></a><span class="lineno"> 1028</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> ooseq_blen;</div>
<div class="line"><a name="l01029"></a><span class="lineno"> 1029</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> ooseq_qlen;</div>
<div class="line"><a name="l01030"></a><span class="lineno"> 1030</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OOSEQ_MAX_BYTES || TCP_OOSEQ_MAX_PBUFS */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01031"></a><span class="lineno"> 1031</span>  </div>
<div class="line"><a name="l01032"></a><span class="lineno"> 1032</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_receive: wrong state"</span>, pcb->state >= ESTABLISHED);</div>
<div class="line"><a name="l01033"></a><span class="lineno"> 1033</span>  </div>
<div class="line"><a name="l01034"></a><span class="lineno"> 1034</span>  <span class="keywordflow">if</span> (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>) {</div>
<div class="line"><a name="l01035"></a><span class="lineno"> 1035</span>  right_wnd_edge = pcb->snd_wnd + pcb->snd_wl2;</div>
<div class="line"><a name="l01036"></a><span class="lineno"> 1036</span>  </div>
<div class="line"><a name="l01037"></a><span class="lineno"> 1037</span>  <span class="comment">/* Update window. */</span></div>
<div class="line"><a name="l01038"></a><span class="lineno"> 1038</span>  <span class="keywordflow">if</span> (TCP_SEQ_LT(pcb->snd_wl1, seqno) ||</div>
<div class="line"><a name="l01039"></a><span class="lineno"> 1039</span>  (pcb->snd_wl1 == seqno && TCP_SEQ_LT(pcb->snd_wl2, ackno)) ||</div>
<div class="line"><a name="l01040"></a><span class="lineno"> 1040</span>  (pcb->snd_wl2 == ackno && (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a>)SND_WND_SCALE(pcb, tcphdr->wnd) > pcb->snd_wnd)) {</div>
<div class="line"><a name="l01041"></a><span class="lineno"> 1041</span>  pcb->snd_wnd = SND_WND_SCALE(pcb, tcphdr->wnd);</div>
<div class="line"><a name="l01042"></a><span class="lineno"> 1042</span>  <span class="comment">/* keep track of the biggest window announced by the remote host to calculate</span></div>
<div class="line"><a name="l01043"></a><span class="lineno"> 1043</span> <span class="comment"> the maximum segment size */</span></div>
<div class="line"><a name="l01044"></a><span class="lineno"> 1044</span>  <span class="keywordflow">if</span> (pcb->snd_wnd_max < pcb->snd_wnd) {</div>
<div class="line"><a name="l01045"></a><span class="lineno"> 1045</span>  pcb->snd_wnd_max = pcb->snd_wnd;</div>
<div class="line"><a name="l01046"></a><span class="lineno"> 1046</span>  }</div>
<div class="line"><a name="l01047"></a><span class="lineno"> 1047</span>  pcb->snd_wl1 = seqno;</div>
<div class="line"><a name="l01048"></a><span class="lineno"> 1048</span>  pcb->snd_wl2 = ackno;</div>
<div class="line"><a name="l01049"></a><span class="lineno"> 1049</span>  <span class="keywordflow">if</span> (pcb->snd_wnd == 0) {</div>
<div class="line"><a name="l01050"></a><span class="lineno"> 1050</span>  <span class="keywordflow">if</span> (pcb->persist_backoff == 0) {</div>
<div class="line"><a name="l01051"></a><span class="lineno"> 1051</span>  <span class="comment">/* start persist timer */</span></div>
<div class="line"><a name="l01052"></a><span class="lineno"> 1052</span>  pcb->persist_cnt = 0;</div>
<div class="line"><a name="l01053"></a><span class="lineno"> 1053</span>  pcb->persist_backoff = 1;</div>
<div class="line"><a name="l01054"></a><span class="lineno"> 1054</span>  }</div>
<div class="line"><a name="l01055"></a><span class="lineno"> 1055</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (pcb->persist_backoff > 0) {</div>
<div class="line"><a name="l01056"></a><span class="lineno"> 1056</span>  <span class="comment">/* stop persist timer */</span></div>
<div class="line"><a name="l01057"></a><span class="lineno"> 1057</span>  pcb->persist_backoff = 0;</div>
<div class="line"><a name="l01058"></a><span class="lineno"> 1058</span>  }</div>
<div class="line"><a name="l01059"></a><span class="lineno"> 1059</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a3704f433e947d6342da77c74e33627e1">TCP_WND_DEBUG</a>, (<span class="stringliteral">"tcp_receive: window update %"</span>TCPWNDSIZE_F<span class="stringliteral">"\n"</span>, pcb->snd_wnd));</div>
<div class="line"><a name="l01060"></a><span class="lineno"> 1060</span> <span class="preprocessor">#if TCP_WND_DEBUG</span></div>
<div class="line"><a name="l01061"></a><span class="lineno"> 1061</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01062"></a><span class="lineno"> 1062</span>  <span class="keywordflow">if</span> (pcb->snd_wnd != (tcpwnd_size_t)SND_WND_SCALE(pcb, tcphdr->wnd)) {</div>
<div class="line"><a name="l01063"></a><span class="lineno"> 1063</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a3704f433e947d6342da77c74e33627e1">TCP_WND_DEBUG</a>,</div>
<div class="line"><a name="l01064"></a><span class="lineno"> 1064</span>  (<span class="stringliteral">"tcp_receive: no window update lastack %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" ackno %"</span></div>
<div class="line"><a name="l01065"></a><span class="lineno"> 1065</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" wl1 %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" seqno %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" wl2 %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l01066"></a><span class="lineno"> 1066</span>  pcb->lastack, ackno, pcb->snd_wl1, seqno, pcb->snd_wl2));</div>
<div class="line"><a name="l01067"></a><span class="lineno"> 1067</span>  }</div>
<div class="line"><a name="l01068"></a><span class="lineno"> 1068</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_WND_DEBUG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01069"></a><span class="lineno"> 1069</span>  }</div>
<div class="line"><a name="l01070"></a><span class="lineno"> 1070</span>  </div>
<div class="line"><a name="l01071"></a><span class="lineno"> 1071</span>  <span class="comment">/* (From Stevens TCP/IP Illustrated Vol II, p970.) Its only a</span></div>
<div class="line"><a name="l01072"></a><span class="lineno"> 1072</span> <span class="comment"> * duplicate ack if:</span></div>
<div class="line"><a name="l01073"></a><span class="lineno"> 1073</span> <span class="comment"> * 1) It doesn't ACK new data</span></div>
<div class="line"><a name="l01074"></a><span class="lineno"> 1074</span> <span class="comment"> * 2) length of received packet is zero (i.e. no payload)</span></div>
<div class="line"><a name="l01075"></a><span class="lineno"> 1075</span> <span class="comment"> * 3) the advertised window hasn't changed</span></div>
<div class="line"><a name="l01076"></a><span class="lineno"> 1076</span> <span class="comment"> * 4) There is outstanding unacknowledged data (retransmission timer running)</span></div>
<div class="line"><a name="l01077"></a><span class="lineno"> 1077</span> <span class="comment"> * 5) The ACK is == biggest ACK sequence number so far seen (snd_una)</span></div>
<div class="line"><a name="l01078"></a><span class="lineno"> 1078</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01079"></a><span class="lineno"> 1079</span> <span class="comment"> * If it passes all five, should process as a dupack:</span></div>
<div class="line"><a name="l01080"></a><span class="lineno"> 1080</span> <span class="comment"> * a) dupacks < 3: do nothing</span></div>
<div class="line"><a name="l01081"></a><span class="lineno"> 1081</span> <span class="comment"> * b) dupacks == 3: fast retransmit</span></div>
<div class="line"><a name="l01082"></a><span class="lineno"> 1082</span> <span class="comment"> * c) dupacks > 3: increase cwnd</span></div>
<div class="line"><a name="l01083"></a><span class="lineno"> 1083</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01084"></a><span class="lineno"> 1084</span> <span class="comment"> * If it only passes 1-3, should reset dupack counter (and add to</span></div>
<div class="line"><a name="l01085"></a><span class="lineno"> 1085</span> <span class="comment"> * stats, which we don't do in lwIP)</span></div>
<div class="line"><a name="l01086"></a><span class="lineno"> 1086</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01087"></a><span class="lineno"> 1087</span> <span class="comment"> * If it only passes 1, should reset dupack counter</span></div>
<div class="line"><a name="l01088"></a><span class="lineno"> 1088</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01089"></a><span class="lineno"> 1089</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01090"></a><span class="lineno"> 1090</span>  </div>
<div class="line"><a name="l01091"></a><span class="lineno"> 1091</span>  <span class="comment">/* Clause 1 */</span></div>
<div class="line"><a name="l01092"></a><span class="lineno"> 1092</span>  <span class="keywordflow">if</span> (TCP_SEQ_LEQ(ackno, pcb->lastack)) {</div>
<div class="line"><a name="l01093"></a><span class="lineno"> 1093</span>  <span class="comment">/* Clause 2 */</span></div>
<div class="line"><a name="l01094"></a><span class="lineno"> 1094</span>  <span class="keywordflow">if</span> (tcplen == 0) {</div>
<div class="line"><a name="l01095"></a><span class="lineno"> 1095</span>  <span class="comment">/* Clause 3 */</span></div>
<div class="line"><a name="l01096"></a><span class="lineno"> 1096</span>  <span class="keywordflow">if</span> (pcb->snd_wl2 + pcb->snd_wnd == right_wnd_edge) {</div>
<div class="line"><a name="l01097"></a><span class="lineno"> 1097</span>  <span class="comment">/* Clause 4 */</span></div>
<div class="line"><a name="l01098"></a><span class="lineno"> 1098</span>  <span class="keywordflow">if</span> (pcb->rtime >= 0) {</div>
<div class="line"><a name="l01099"></a><span class="lineno"> 1099</span>  <span class="comment">/* Clause 5 */</span></div>
<div class="line"><a name="l01100"></a><span class="lineno"> 1100</span>  <span class="keywordflow">if</span> (pcb->lastack == ackno) {</div>
<div class="line"><a name="l01101"></a><span class="lineno"> 1101</span>  found_dupack = 1;</div>
<div class="line"><a name="l01102"></a><span class="lineno"> 1102</span>  <span class="keywordflow">if</span> ((<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>)(pcb->dupacks + 1) > pcb->dupacks) {</div>
<div class="line"><a name="l01103"></a><span class="lineno"> 1103</span>  ++pcb->dupacks;</div>
<div class="line"><a name="l01104"></a><span class="lineno"> 1104</span>  }</div>
<div class="line"><a name="l01105"></a><span class="lineno"> 1105</span>  <span class="keywordflow">if</span> (pcb->dupacks > 3) {</div>
<div class="line"><a name="l01106"></a><span class="lineno"> 1106</span>  <span class="comment">/* Inflate the congestion window, but not if it means that</span></div>
<div class="line"><a name="l01107"></a><span class="lineno"> 1107</span> <span class="comment"> the value overflows. */</span></div>
<div class="line"><a name="l01108"></a><span class="lineno"> 1108</span>  <span class="keywordflow">if</span> ((tcpwnd_size_t)(pcb->cwnd + pcb->mss) > pcb->cwnd) {</div>
<div class="line"><a name="l01109"></a><span class="lineno"> 1109</span>  pcb->cwnd += pcb->mss;</div>
<div class="line"><a name="l01110"></a><span class="lineno"> 1110</span>  }</div>
<div class="line"><a name="l01111"></a><span class="lineno"> 1111</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (pcb->dupacks == 3) {</div>
<div class="line"><a name="l01112"></a><span class="lineno"> 1112</span>  <span class="comment">/* Do fast retransmit */</span></div>
<div class="line"><a name="l01113"></a><span class="lineno"> 1113</span>  tcp_rexmit_fast(pcb);</div>
<div class="line"><a name="l01114"></a><span class="lineno"> 1114</span>  }</div>
<div class="line"><a name="l01115"></a><span class="lineno"> 1115</span>  }</div>
<div class="line"><a name="l01116"></a><span class="lineno"> 1116</span>  }</div>
<div class="line"><a name="l01117"></a><span class="lineno"> 1117</span>  }</div>
<div class="line"><a name="l01118"></a><span class="lineno"> 1118</span>  }</div>
<div class="line"><a name="l01119"></a><span class="lineno"> 1119</span>  <span class="comment">/* If Clause (1) or more is true, but not a duplicate ack, reset</span></div>
<div class="line"><a name="l01120"></a><span class="lineno"> 1120</span> <span class="comment"> * count of consecutive duplicate acks */</span></div>
<div class="line"><a name="l01121"></a><span class="lineno"> 1121</span>  <span class="keywordflow">if</span> (!found_dupack) {</div>
<div class="line"><a name="l01122"></a><span class="lineno"> 1122</span>  pcb->dupacks = 0;</div>
<div class="line"><a name="l01123"></a><span class="lineno"> 1123</span>  }</div>
<div class="line"><a name="l01124"></a><span class="lineno"> 1124</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (TCP_SEQ_BETWEEN(ackno, pcb->lastack+1, pcb->snd_nxt)) {</div>
<div class="line"><a name="l01125"></a><span class="lineno"> 1125</span>  <span class="comment">/* We come here when the ACK acknowledges new data. */</span></div>
<div class="line"><a name="l01126"></a><span class="lineno"> 1126</span>  </div>
<div class="line"><a name="l01127"></a><span class="lineno"> 1127</span>  <span class="comment">/* Reset the "IN Fast Retransmit" flag, since we are no longer</span></div>
<div class="line"><a name="l01128"></a><span class="lineno"> 1128</span> <span class="comment"> in fast retransmit. Also reset the congestion window to the</span></div>
<div class="line"><a name="l01129"></a><span class="lineno"> 1129</span> <span class="comment"> slow start threshold. */</span></div>
<div class="line"><a name="l01130"></a><span class="lineno"> 1130</span>  <span class="keywordflow">if</span> (pcb->flags & TF_INFR) {</div>
<div class="line"><a name="l01131"></a><span class="lineno"> 1131</span>  pcb->flags &= ~TF_INFR;</div>
<div class="line"><a name="l01132"></a><span class="lineno"> 1132</span>  pcb->cwnd = pcb->ssthresh;</div>
<div class="line"><a name="l01133"></a><span class="lineno"> 1133</span>  }</div>
<div class="line"><a name="l01134"></a><span class="lineno"> 1134</span>  </div>
<div class="line"><a name="l01135"></a><span class="lineno"> 1135</span>  <span class="comment">/* Reset the number of retransmissions. */</span></div>
<div class="line"><a name="l01136"></a><span class="lineno"> 1136</span>  pcb->nrtx = 0;</div>
<div class="line"><a name="l01137"></a><span class="lineno"> 1137</span>  </div>
<div class="line"><a name="l01138"></a><span class="lineno"> 1138</span>  <span class="comment">/* Reset the retransmission time-out. */</span></div>
<div class="line"><a name="l01139"></a><span class="lineno"> 1139</span>  pcb->rto = (pcb->sa >> 3) + pcb->sv;</div>
<div class="line"><a name="l01140"></a><span class="lineno"> 1140</span>  </div>
<div class="line"><a name="l01141"></a><span class="lineno"> 1141</span>  <span class="comment">/* Reset the fast retransmit variables. */</span></div>
<div class="line"><a name="l01142"></a><span class="lineno"> 1142</span>  pcb->dupacks = 0;</div>
<div class="line"><a name="l01143"></a><span class="lineno"> 1143</span>  pcb->lastack = ackno;</div>
<div class="line"><a name="l01144"></a><span class="lineno"> 1144</span>  </div>
<div class="line"><a name="l01145"></a><span class="lineno"> 1145</span>  <span class="comment">/* Update the congestion control variables (cwnd and</span></div>
<div class="line"><a name="l01146"></a><span class="lineno"> 1146</span> <span class="comment"> ssthresh). */</span></div>
<div class="line"><a name="l01147"></a><span class="lineno"> 1147</span>  if (pcb->state >= ESTABLISHED) {</div>
<div class="line"><a name="l01148"></a><span class="lineno"> 1148</span>  <span class="keywordflow">if</span> (pcb->cwnd < pcb->ssthresh) {</div>
<div class="line"><a name="l01149"></a><span class="lineno"> 1149</span>  <span class="keywordflow">if</span> ((tcpwnd_size_t)(pcb->cwnd + pcb->mss) > pcb->cwnd) {</div>
<div class="line"><a name="l01150"></a><span class="lineno"> 1150</span>  pcb->cwnd += pcb->mss;</div>
<div class="line"><a name="l01151"></a><span class="lineno"> 1151</span>  }</div>
<div class="line"><a name="l01152"></a><span class="lineno"> 1152</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a66df03d8192cd978d3321a9d68bf5411">TCP_CWND_DEBUG</a>, (<span class="stringliteral">"tcp_receive: slow start cwnd %"</span>TCPWNDSIZE_F<span class="stringliteral">"\n"</span>, pcb->cwnd));</div>
<div class="line"><a name="l01153"></a><span class="lineno"> 1153</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01154"></a><span class="lineno"> 1154</span>  tcpwnd_size_t new_cwnd = (pcb->cwnd + pcb->mss * pcb->mss / pcb->cwnd);</div>
<div class="line"><a name="l01155"></a><span class="lineno"> 1155</span>  <span class="keywordflow">if</span> (new_cwnd > pcb->cwnd) {</div>
<div class="line"><a name="l01156"></a><span class="lineno"> 1156</span>  pcb->cwnd = new_cwnd;</div>
<div class="line"><a name="l01157"></a><span class="lineno"> 1157</span>  }</div>
<div class="line"><a name="l01158"></a><span class="lineno"> 1158</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a66df03d8192cd978d3321a9d68bf5411">TCP_CWND_DEBUG</a>, (<span class="stringliteral">"tcp_receive: congestion avoidance cwnd %"</span>TCPWNDSIZE_F<span class="stringliteral">"\n"</span>, pcb->cwnd));</div>
<div class="line"><a name="l01159"></a><span class="lineno"> 1159</span>  }</div>
<div class="line"><a name="l01160"></a><span class="lineno"> 1160</span>  }</div>
<div class="line"><a name="l01161"></a><span class="lineno"> 1161</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_receive: ACK for %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">", unacked->seqno %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">":%"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l01162"></a><span class="lineno"> 1162</span>  ackno,</div>
<div class="line"><a name="l01163"></a><span class="lineno"> 1163</span>  pcb->unacked != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>?</div>
<div class="line"><a name="l01164"></a><span class="lineno"> 1164</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(pcb->unacked->tcphdr->seqno): 0,</div>
<div class="line"><a name="l01165"></a><span class="lineno"> 1165</span>  pcb->unacked != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>?</div>
<div class="line"><a name="l01166"></a><span class="lineno"> 1166</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(pcb->unacked->tcphdr->seqno) + TCP_TCPLEN(pcb->unacked): 0));</div>
<div class="line"><a name="l01167"></a><span class="lineno"> 1167</span>  </div>
<div class="line"><a name="l01168"></a><span class="lineno"> 1168</span>  <span class="comment">/* Remove segment from the unacknowledged list if the incoming</span></div>
<div class="line"><a name="l01169"></a><span class="lineno"> 1169</span> <span class="comment"> ACK acknowledges them. */</span></div>
<div class="line"><a name="l01170"></a><span class="lineno"> 1170</span>  <span class="keywordflow">while</span> (pcb->unacked != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> &&</div>
<div class="line"><a name="l01171"></a><span class="lineno"> 1171</span>  TCP_SEQ_LEQ(<a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(pcb->unacked->tcphdr->seqno) +</div>
<div class="line"><a name="l01172"></a><span class="lineno"> 1172</span>  TCP_TCPLEN(pcb->unacked), ackno)) {</div>
<div class="line"><a name="l01173"></a><span class="lineno"> 1173</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_receive: removing %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">":%"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" from pcb->unacked\n"</span>,</div>
<div class="line"><a name="l01174"></a><span class="lineno"> 1174</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(pcb->unacked->tcphdr->seqno),</div>
<div class="line"><a name="l01175"></a><span class="lineno"> 1175</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(pcb->unacked->tcphdr->seqno) +</div>
<div class="line"><a name="l01176"></a><span class="lineno"> 1176</span>  TCP_TCPLEN(pcb->unacked)));</div>
<div class="line"><a name="l01177"></a><span class="lineno"> 1177</span>  </div>
<div class="line"><a name="l01178"></a><span class="lineno"> 1178</span>  next = pcb->unacked;</div>
<div class="line"><a name="l01179"></a><span class="lineno"> 1179</span>  pcb->unacked = pcb->unacked->next;</div>
<div class="line"><a name="l01180"></a><span class="lineno"> 1180</span>  </div>
<div class="line"><a name="l01181"></a><span class="lineno"> 1181</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#ae7980c7f8eb45cd411bf410ff0a3fc55">TCP_QLEN_DEBUG</a>, (<span class="stringliteral">"tcp_receive: queuelen %"</span>TCPWNDSIZE_F<span class="stringliteral">" ... "</span>, (tcpwnd_size_t)pcb->snd_queuelen));</div>
<div class="line"><a name="l01182"></a><span class="lineno"> 1182</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"pcb->snd_queuelen >= pbuf_clen(next->p)"</span>, (pcb->snd_queuelen >= <a class="code" href="../../d0/d35/pbuf_8h.html#a5df7ac5ae59012fe9aeddba375a72190">pbuf_clen</a>(next->p)));</div>
<div class="line"><a name="l01183"></a><span class="lineno"> 1183</span>  </div>
<div class="line"><a name="l01184"></a><span class="lineno"> 1184</span>  pcb->snd_queuelen -= <a class="code" href="../../d0/d35/pbuf_8h.html#a5df7ac5ae59012fe9aeddba375a72190">pbuf_clen</a>(next->p);</div>
<div class="line"><a name="l01185"></a><span class="lineno"> 1185</span>  recv_acked += next->len;</div>
<div class="line"><a name="l01186"></a><span class="lineno"> 1186</span>  tcp_seg_free(next);</div>
<div class="line"><a name="l01187"></a><span class="lineno"> 1187</span>  </div>
<div class="line"><a name="l01188"></a><span class="lineno"> 1188</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#ae7980c7f8eb45cd411bf410ff0a3fc55">TCP_QLEN_DEBUG</a>, (<span class="stringliteral">"%"</span>TCPWNDSIZE_F<span class="stringliteral">" (after freeing unacked)\n"</span>, (tcpwnd_size_t)pcb->snd_queuelen));</div>
<div class="line"><a name="l01189"></a><span class="lineno"> 1189</span>  <span class="keywordflow">if</span> (pcb->snd_queuelen != 0) {</div>
<div class="line"><a name="l01190"></a><span class="lineno"> 1190</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_receive: valid queue length"</span>, pcb->unacked != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> ||</div>
<div class="line"><a name="l01191"></a><span class="lineno"> 1191</span>  pcb->unsent != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);</div>
<div class="line"><a name="l01192"></a><span class="lineno"> 1192</span>  }</div>
<div class="line"><a name="l01193"></a><span class="lineno"> 1193</span>  }</div>
<div class="line"><a name="l01194"></a><span class="lineno"> 1194</span>  </div>
<div class="line"><a name="l01195"></a><span class="lineno"> 1195</span>  <span class="comment">/* If there's nothing left to acknowledge, stop the retransmit</span></div>
<div class="line"><a name="l01196"></a><span class="lineno"> 1196</span> <span class="comment"> timer, otherwise reset it to start again */</span></div>
<div class="line"><a name="l01197"></a><span class="lineno"> 1197</span>  <span class="keywordflow">if</span> (pcb->unacked == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01198"></a><span class="lineno"> 1198</span>  pcb->rtime = -1;</div>
<div class="line"><a name="l01199"></a><span class="lineno"> 1199</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01200"></a><span class="lineno"> 1200</span>  pcb->rtime = 0;</div>
<div class="line"><a name="l01201"></a><span class="lineno"> 1201</span>  }</div>
<div class="line"><a name="l01202"></a><span class="lineno"> 1202</span>  </div>
<div class="line"><a name="l01203"></a><span class="lineno"> 1203</span>  pcb->polltmr = 0;</div>
<div class="line"><a name="l01204"></a><span class="lineno"> 1204</span>  </div>
<div class="line"><a name="l01205"></a><span class="lineno"> 1205</span> <span class="preprocessor">#if LWIP_IPV6 && LWIP_ND6_TCP_REACHABILITY_HINTS</span></div>
<div class="line"><a name="l01206"></a><span class="lineno"> 1206</span>  <span class="keywordflow">if</span> (ip_current_is_v6()) {</div>
<div class="line"><a name="l01207"></a><span class="lineno"> 1207</span>  <span class="comment">/* Inform neighbor reachability of forward progress. */</span></div>
<div class="line"><a name="l01208"></a><span class="lineno"> 1208</span>  nd6_reachability_hint(ip6_current_src_addr());</div>
<div class="line"><a name="l01209"></a><span class="lineno"> 1209</span>  }</div>
<div class="line"><a name="l01210"></a><span class="lineno"> 1210</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_IPV6 && LWIP_ND6_TCP_REACHABILITY_HINTS*/</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01211"></a><span class="lineno"> 1211</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01212"></a><span class="lineno"> 1212</span>  <span class="comment">/* Out of sequence ACK, didn't really ack anything */</span></div>
<div class="line"><a name="l01213"></a><span class="lineno"> 1213</span>  tcp_send_empty_ack(pcb);</div>
<div class="line"><a name="l01214"></a><span class="lineno"> 1214</span>  }</div>
<div class="line"><a name="l01215"></a><span class="lineno"> 1215</span>  </div>
<div class="line"><a name="l01216"></a><span class="lineno"> 1216</span>  <span class="comment">/* We go through the ->unsent list to see if any of the segments</span></div>
<div class="line"><a name="l01217"></a><span class="lineno"> 1217</span> <span class="comment"> on the list are acknowledged by the ACK. This may seem</span></div>
<div class="line"><a name="l01218"></a><span class="lineno"> 1218</span> <span class="comment"> strange since an "unsent" segment shouldn't be acked. The</span></div>
<div class="line"><a name="l01219"></a><span class="lineno"> 1219</span> <span class="comment"> rationale is that lwIP puts all outstanding segments on the</span></div>
<div class="line"><a name="l01220"></a><span class="lineno"> 1220</span> <span class="comment"> ->unsent list after a retransmission, so these segments may</span></div>
<div class="line"><a name="l01221"></a><span class="lineno"> 1221</span> <span class="comment"> in fact have been sent once. */</span></div>
<div class="line"><a name="l01222"></a><span class="lineno"> 1222</span>  <span class="keywordflow">while</span> (pcb->unsent != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> &&</div>
<div class="line"><a name="l01223"></a><span class="lineno"> 1223</span>  TCP_SEQ_BETWEEN(ackno, <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(pcb->unsent->tcphdr->seqno) +</div>
<div class="line"><a name="l01224"></a><span class="lineno"> 1224</span>  TCP_TCPLEN(pcb->unsent), pcb->snd_nxt)) {</div>
<div class="line"><a name="l01225"></a><span class="lineno"> 1225</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_receive: removing %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">":%"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" from pcb->unsent\n"</span>,</div>
<div class="line"><a name="l01226"></a><span class="lineno"> 1226</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(pcb->unsent->tcphdr->seqno), <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(pcb->unsent->tcphdr->seqno) +</div>
<div class="line"><a name="l01227"></a><span class="lineno"> 1227</span>  TCP_TCPLEN(pcb->unsent)));</div>
<div class="line"><a name="l01228"></a><span class="lineno"> 1228</span>  </div>
<div class="line"><a name="l01229"></a><span class="lineno"> 1229</span>  next = pcb->unsent;</div>
<div class="line"><a name="l01230"></a><span class="lineno"> 1230</span>  pcb->unsent = pcb->unsent->next;</div>
<div class="line"><a name="l01231"></a><span class="lineno"> 1231</span> <span class="preprocessor">#if TCP_OVERSIZE</span></div>
<div class="line"><a name="l01232"></a><span class="lineno"> 1232</span>  <span class="keywordflow">if</span> (pcb->unsent == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01233"></a><span class="lineno"> 1233</span>  pcb->unsent_oversize = 0;</div>
<div class="line"><a name="l01234"></a><span class="lineno"> 1234</span>  }</div>
<div class="line"><a name="l01235"></a><span class="lineno"> 1235</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01236"></a><span class="lineno"> 1236</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#ae7980c7f8eb45cd411bf410ff0a3fc55">TCP_QLEN_DEBUG</a>, (<span class="stringliteral">"tcp_receive: queuelen %"</span>TCPWNDSIZE_F<span class="stringliteral">" ... "</span>, (tcpwnd_size_t)pcb->snd_queuelen));</div>
<div class="line"><a name="l01237"></a><span class="lineno"> 1237</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"pcb->snd_queuelen >= pbuf_clen(next->p)"</span>, (pcb->snd_queuelen >= <a class="code" href="../../d0/d35/pbuf_8h.html#a5df7ac5ae59012fe9aeddba375a72190">pbuf_clen</a>(next->p)));</div>
<div class="line"><a name="l01238"></a><span class="lineno"> 1238</span>  <span class="comment">/* Prevent ACK for FIN to generate a sent event */</span></div>
<div class="line"><a name="l01239"></a><span class="lineno"> 1239</span>  pcb->snd_queuelen -= <a class="code" href="../../d0/d35/pbuf_8h.html#a5df7ac5ae59012fe9aeddba375a72190">pbuf_clen</a>(next->p);</div>
<div class="line"><a name="l01240"></a><span class="lineno"> 1240</span>  recv_acked += next->len;</div>
<div class="line"><a name="l01241"></a><span class="lineno"> 1241</span>  tcp_seg_free(next);</div>
<div class="line"><a name="l01242"></a><span class="lineno"> 1242</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#ae7980c7f8eb45cd411bf410ff0a3fc55">TCP_QLEN_DEBUG</a>, (<span class="stringliteral">"%"</span>TCPWNDSIZE_F<span class="stringliteral">" (after freeing unsent)\n"</span>, (tcpwnd_size_t)pcb->snd_queuelen));</div>
<div class="line"><a name="l01243"></a><span class="lineno"> 1243</span>  <span class="keywordflow">if</span> (pcb->snd_queuelen != 0) {</div>
<div class="line"><a name="l01244"></a><span class="lineno"> 1244</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_receive: valid queue length"</span>,</div>
<div class="line"><a name="l01245"></a><span class="lineno"> 1245</span>  pcb->unacked != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> || pcb->unsent != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);</div>
<div class="line"><a name="l01246"></a><span class="lineno"> 1246</span>  }</div>
<div class="line"><a name="l01247"></a><span class="lineno"> 1247</span>  }</div>
<div class="line"><a name="l01248"></a><span class="lineno"> 1248</span>  pcb->snd_buf += recv_acked;</div>
<div class="line"><a name="l01249"></a><span class="lineno"> 1249</span>  <span class="comment">/* End of ACK for new data processing. */</span></div>
<div class="line"><a name="l01250"></a><span class="lineno"> 1250</span>  </div>
<div class="line"><a name="l01251"></a><span class="lineno"> 1251</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#ad6e52e37415d0d0cbe4931a28f5a9662">TCP_RTO_DEBUG</a>, (<span class="stringliteral">"tcp_receive: pcb->rttest %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" rtseq %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" ackno %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l01252"></a><span class="lineno"> 1252</span>  pcb->rttest, pcb->rtseq, ackno));</div>
<div class="line"><a name="l01253"></a><span class="lineno"> 1253</span>  </div>
<div class="line"><a name="l01254"></a><span class="lineno"> 1254</span>  <span class="comment">/* RTT estimation calculations. This is done by checking if the</span></div>
<div class="line"><a name="l01255"></a><span class="lineno"> 1255</span> <span class="comment"> incoming segment acknowledges the segment we use to take a</span></div>
<div class="line"><a name="l01256"></a><span class="lineno"> 1256</span> <span class="comment"> round-trip time measurement. */</span></div>
<div class="line"><a name="l01257"></a><span class="lineno"> 1257</span>  <span class="keywordflow">if</span> (pcb->rttest && TCP_SEQ_LT(pcb->rtseq, ackno)) {</div>
<div class="line"><a name="l01258"></a><span class="lineno"> 1258</span>  <span class="comment">/* diff between this shouldn't exceed 32K since this are tcp timer ticks</span></div>
<div class="line"><a name="l01259"></a><span class="lineno"> 1259</span> <span class="comment"> and a round-trip shouldn't be that long... */</span></div>
<div class="line"><a name="l01260"></a><span class="lineno"> 1260</span>  m = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#gacf46f4df0ebab84edebcb69967fdf86b">s16_t</a>)(tcp_ticks - pcb->rttest);</div>
<div class="line"><a name="l01261"></a><span class="lineno"> 1261</span>  </div>
<div class="line"><a name="l01262"></a><span class="lineno"> 1262</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#ad6e52e37415d0d0cbe4931a28f5a9662">TCP_RTO_DEBUG</a>, (<span class="stringliteral">"tcp_receive: experienced rtt %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" ticks (%"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" msec).\n"</span>,</div>
<div class="line"><a name="l01263"></a><span class="lineno"> 1263</span>  m, (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)(m * TCP_SLOW_INTERVAL)));</div>
<div class="line"><a name="l01264"></a><span class="lineno"> 1264</span>  </div>
<div class="line"><a name="l01265"></a><span class="lineno"> 1265</span>  <span class="comment">/* This is taken directly from VJs original code in his paper */</span></div>
<div class="line"><a name="l01266"></a><span class="lineno"> 1266</span>  m = m - (pcb->sa >> 3);</div>
<div class="line"><a name="l01267"></a><span class="lineno"> 1267</span>  pcb->sa += m;</div>
<div class="line"><a name="l01268"></a><span class="lineno"> 1268</span>  <span class="keywordflow">if</span> (m < 0) {</div>
<div class="line"><a name="l01269"></a><span class="lineno"> 1269</span>  m = -m;</div>
<div class="line"><a name="l01270"></a><span class="lineno"> 1270</span>  }</div>
<div class="line"><a name="l01271"></a><span class="lineno"> 1271</span>  m = m - (pcb->sv >> 2);</div>
<div class="line"><a name="l01272"></a><span class="lineno"> 1272</span>  pcb->sv += m;</div>
<div class="line"><a name="l01273"></a><span class="lineno"> 1273</span>  pcb->rto = (pcb->sa >> 3) + pcb->sv;</div>
<div class="line"><a name="l01274"></a><span class="lineno"> 1274</span>  </div>
<div class="line"><a name="l01275"></a><span class="lineno"> 1275</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#ad6e52e37415d0d0cbe4931a28f5a9662">TCP_RTO_DEBUG</a>, (<span class="stringliteral">"tcp_receive: RTO %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" (%"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" milliseconds)\n"</span>,</div>
<div class="line"><a name="l01276"></a><span class="lineno"> 1276</span>  pcb->rto, (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)(pcb->rto * TCP_SLOW_INTERVAL)));</div>
<div class="line"><a name="l01277"></a><span class="lineno"> 1277</span>  </div>
<div class="line"><a name="l01278"></a><span class="lineno"> 1278</span>  pcb->rttest = 0;</div>
<div class="line"><a name="l01279"></a><span class="lineno"> 1279</span>  }</div>
<div class="line"><a name="l01280"></a><span class="lineno"> 1280</span>  }</div>
<div class="line"><a name="l01281"></a><span class="lineno"> 1281</span>  </div>
<div class="line"><a name="l01282"></a><span class="lineno"> 1282</span>  <span class="comment">/* If the incoming segment contains data, we must process it</span></div>
<div class="line"><a name="l01283"></a><span class="lineno"> 1283</span> <span class="comment"> further unless the pcb already received a FIN.</span></div>
<div class="line"><a name="l01284"></a><span class="lineno"> 1284</span> <span class="comment"> (RFC 793, chapter 3.9, "SEGMENT ARRIVES" in states CLOSE-WAIT, CLOSING,</span></div>
<div class="line"><a name="l01285"></a><span class="lineno"> 1285</span> <span class="comment"> LAST-ACK and TIME-WAIT: "Ignore the segment text.") */</span></div>
<div class="line"><a name="l01286"></a><span class="lineno"> 1286</span>  <span class="keywordflow">if</span> ((tcplen > 0) && (pcb->state < CLOSE_WAIT)) {</div>
<div class="line"><a name="l01287"></a><span class="lineno"> 1287</span>  <span class="comment">/* This code basically does three things:</span></div>
<div class="line"><a name="l01288"></a><span class="lineno"> 1288</span> <span class="comment"></span> </div>
<div class="line"><a name="l01289"></a><span class="lineno"> 1289</span> <span class="comment"> +) If the incoming segment contains data that is the next</span></div>
<div class="line"><a name="l01290"></a><span class="lineno"> 1290</span> <span class="comment"> in-sequence data, this data is passed to the application. This</span></div>
<div class="line"><a name="l01291"></a><span class="lineno"> 1291</span> <span class="comment"> might involve trimming the first edge of the data. The rcv_nxt</span></div>
<div class="line"><a name="l01292"></a><span class="lineno"> 1292</span> <span class="comment"> variable and the advertised window are adjusted.</span></div>
<div class="line"><a name="l01293"></a><span class="lineno"> 1293</span> <span class="comment"></span> </div>
<div class="line"><a name="l01294"></a><span class="lineno"> 1294</span> <span class="comment"> +) If the incoming segment has data that is above the next</span></div>
<div class="line"><a name="l01295"></a><span class="lineno"> 1295</span> <span class="comment"> sequence number expected (->rcv_nxt), the segment is placed on</span></div>
<div class="line"><a name="l01296"></a><span class="lineno"> 1296</span> <span class="comment"> the ->ooseq queue. This is done by finding the appropriate</span></div>
<div class="line"><a name="l01297"></a><span class="lineno"> 1297</span> <span class="comment"> place in the ->ooseq queue (which is ordered by sequence</span></div>
<div class="line"><a name="l01298"></a><span class="lineno"> 1298</span> <span class="comment"> number) and trim the segment in both ends if needed. An</span></div>
<div class="line"><a name="l01299"></a><span class="lineno"> 1299</span> <span class="comment"> immediate ACK is sent to indicate that we received an</span></div>
<div class="line"><a name="l01300"></a><span class="lineno"> 1300</span> <span class="comment"> out-of-sequence segment.</span></div>
<div class="line"><a name="l01301"></a><span class="lineno"> 1301</span> <span class="comment"></span> </div>
<div class="line"><a name="l01302"></a><span class="lineno"> 1302</span> <span class="comment"> +) Finally, we check if the first segment on the ->ooseq queue</span></div>
<div class="line"><a name="l01303"></a><span class="lineno"> 1303</span> <span class="comment"> now is in sequence (i.e., if rcv_nxt >= ooseq->seqno). If</span></div>
<div class="line"><a name="l01304"></a><span class="lineno"> 1304</span> <span class="comment"> rcv_nxt > ooseq->seqno, we must trim the first edge of the</span></div>
<div class="line"><a name="l01305"></a><span class="lineno"> 1305</span> <span class="comment"> segment on ->ooseq before we adjust rcv_nxt. The data in the</span></div>
<div class="line"><a name="l01306"></a><span class="lineno"> 1306</span> <span class="comment"> segments that are now on sequence are chained onto the</span></div>
<div class="line"><a name="l01307"></a><span class="lineno"> 1307</span> <span class="comment"> incoming segment so that we only need to call the application</span></div>
<div class="line"><a name="l01308"></a><span class="lineno"> 1308</span> <span class="comment"> once.</span></div>
<div class="line"><a name="l01309"></a><span class="lineno"> 1309</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01310"></a><span class="lineno"> 1310</span>  </div>
<div class="line"><a name="l01311"></a><span class="lineno"> 1311</span>  <span class="comment">/* First, we check if we must trim the first edge. We have to do</span></div>
<div class="line"><a name="l01312"></a><span class="lineno"> 1312</span> <span class="comment"> this if the sequence number of the incoming segment is less</span></div>
<div class="line"><a name="l01313"></a><span class="lineno"> 1313</span> <span class="comment"> than rcv_nxt, and the sequence number plus the length of the</span></div>
<div class="line"><a name="l01314"></a><span class="lineno"> 1314</span> <span class="comment"> segment is larger than rcv_nxt. */</span></div>
<div class="line"><a name="l01315"></a><span class="lineno"> 1315</span>  <span class="comment">/* if (TCP_SEQ_LT(seqno, pcb->rcv_nxt)) {</span></div>
<div class="line"><a name="l01316"></a><span class="lineno"> 1316</span> <span class="comment"> if (TCP_SEQ_LT(pcb->rcv_nxt, seqno + tcplen)) {*/</span></div>
<div class="line"><a name="l01317"></a><span class="lineno"> 1317</span>  <span class="keywordflow">if</span> (TCP_SEQ_BETWEEN(pcb->rcv_nxt, seqno + 1, seqno + tcplen - 1)) {</div>
<div class="line"><a name="l01318"></a><span class="lineno"> 1318</span>  <span class="comment">/* Trimming the first edge is done by pushing the payload</span></div>
<div class="line"><a name="l01319"></a><span class="lineno"> 1319</span> <span class="comment"> pointer in the pbuf downwards. This is somewhat tricky since</span></div>
<div class="line"><a name="l01320"></a><span class="lineno"> 1320</span> <span class="comment"> we do not want to discard the full contents of the pbuf up to</span></div>
<div class="line"><a name="l01321"></a><span class="lineno"> 1321</span> <span class="comment"> the new starting point of the data since we have to keep the</span></div>
<div class="line"><a name="l01322"></a><span class="lineno"> 1322</span> <span class="comment"> TCP header which is present in the first pbuf in the chain.</span></div>
<div class="line"><a name="l01323"></a><span class="lineno"> 1323</span> <span class="comment"></span> </div>
<div class="line"><a name="l01324"></a><span class="lineno"> 1324</span> <span class="comment"> What is done is really quite a nasty hack: the first pbuf in</span></div>
<div class="line"><a name="l01325"></a><span class="lineno"> 1325</span> <span class="comment"> the pbuf chain is pointed to by inseg.p. Since we need to be</span></div>
<div class="line"><a name="l01326"></a><span class="lineno"> 1326</span> <span class="comment"> able to deallocate the whole pbuf, we cannot change this</span></div>
<div class="line"><a name="l01327"></a><span class="lineno"> 1327</span> <span class="comment"> inseg.p pointer to point to any of the later pbufs in the</span></div>
<div class="line"><a name="l01328"></a><span class="lineno"> 1328</span> <span class="comment"> chain. Instead, we point the ->payload pointer in the first</span></div>
<div class="line"><a name="l01329"></a><span class="lineno"> 1329</span> <span class="comment"> pbuf to data in one of the later pbufs. We also set the</span></div>
<div class="line"><a name="l01330"></a><span class="lineno"> 1330</span> <span class="comment"> inseg.data pointer to point to the right place. This way, the</span></div>
<div class="line"><a name="l01331"></a><span class="lineno"> 1331</span> <span class="comment"> ->p pointer will still point to the first pbuf, but the</span></div>
<div class="line"><a name="l01332"></a><span class="lineno"> 1332</span> <span class="comment"> ->p->payload pointer will point to data in another pbuf.</span></div>
<div class="line"><a name="l01333"></a><span class="lineno"> 1333</span> <span class="comment"></span> </div>
<div class="line"><a name="l01334"></a><span class="lineno"> 1334</span> <span class="comment"> After we are done with adjusting the pbuf pointers we must</span></div>
<div class="line"><a name="l01335"></a><span class="lineno"> 1335</span> <span class="comment"> adjust the ->data pointer in the seg and the segment</span></div>
<div class="line"><a name="l01336"></a><span class="lineno"> 1336</span> <span class="comment"> length.*/</span></div>
<div class="line"><a name="l01337"></a><span class="lineno"> 1337</span>  </div>
<div class="line"><a name="l01338"></a><span class="lineno"> 1338</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p = inseg.p;</div>
<div class="line"><a name="l01339"></a><span class="lineno"> 1339</span>  off = pcb->rcv_nxt - seqno;</div>
<div class="line"><a name="l01340"></a><span class="lineno"> 1340</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"inseg.p != NULL"</span>, inseg.p);</div>
<div class="line"><a name="l01341"></a><span class="lineno"> 1341</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"insane offset!"</span>, (off < 0x7fff));</div>
<div class="line"><a name="l01342"></a><span class="lineno"> 1342</span>  <span class="keywordflow">if</span> (inseg.p->len < off) {</div>
<div class="line"><a name="l01343"></a><span class="lineno"> 1343</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"pbuf too short!"</span>, (((<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga10f9a3d7baef58ccc23228c3bd29c1fb">s32_t</a>)inseg.p->tot_len) >= off));</div>
<div class="line"><a name="l01344"></a><span class="lineno"> 1344</span>  new_tot_len = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)(inseg.p->tot_len - off);</div>
<div class="line"><a name="l01345"></a><span class="lineno"> 1345</span>  <span class="keywordflow">while</span> (p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> < off) {</div>
<div class="line"><a name="l01346"></a><span class="lineno"> 1346</span>  off -= p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>;</div>
<div class="line"><a name="l01347"></a><span class="lineno"> 1347</span>  <span class="comment">/* KJM following line changed (with addition of new_tot_len var)</span></div>
<div class="line"><a name="l01348"></a><span class="lineno"> 1348</span> <span class="comment"> to fix bug #9076</span></div>
<div class="line"><a name="l01349"></a><span class="lineno"> 1349</span> <span class="comment"> inseg.p->tot_len -= p->len; */</span></div>
<div class="line"><a name="l01350"></a><span class="lineno"> 1350</span>  p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a> = new_tot_len;</div>
<div class="line"><a name="l01351"></a><span class="lineno"> 1351</span>  p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> = 0;</div>
<div class="line"><a name="l01352"></a><span class="lineno"> 1352</span>  p = p-><a class="code" href="../../d9/db8/structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>;</div>
<div class="line"><a name="l01353"></a><span class="lineno"> 1353</span>  }</div>
<div class="line"><a name="l01354"></a><span class="lineno"> 1354</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d0/d35/pbuf_8h.html#aaa17c1951cf2d207b6adfd3947d91f00">pbuf_header</a>(p, (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#gacf46f4df0ebab84edebcb69967fdf86b">s16_t</a>)-off)) {</div>
<div class="line"><a name="l01355"></a><span class="lineno"> 1355</span>  <span class="comment">/* Do we need to cope with this failing? Assert for now */</span></div>
<div class="line"><a name="l01356"></a><span class="lineno"> 1356</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"pbuf_header failed"</span>, 0);</div>
<div class="line"><a name="l01357"></a><span class="lineno"> 1357</span>  }</div>
<div class="line"><a name="l01358"></a><span class="lineno"> 1358</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01359"></a><span class="lineno"> 1359</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d0/d35/pbuf_8h.html#aaa17c1951cf2d207b6adfd3947d91f00">pbuf_header</a>(inseg.p, (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#gacf46f4df0ebab84edebcb69967fdf86b">s16_t</a>)-off)) {</div>
<div class="line"><a name="l01360"></a><span class="lineno"> 1360</span>  <span class="comment">/* Do we need to cope with this failing? Assert for now */</span></div>
<div class="line"><a name="l01361"></a><span class="lineno"> 1361</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"pbuf_header failed"</span>, 0);</div>
<div class="line"><a name="l01362"></a><span class="lineno"> 1362</span>  }</div>
<div class="line"><a name="l01363"></a><span class="lineno"> 1363</span>  }</div>
<div class="line"><a name="l01364"></a><span class="lineno"> 1364</span>  inseg.len -= (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)(pcb->rcv_nxt - seqno);</div>
<div class="line"><a name="l01365"></a><span class="lineno"> 1365</span>  inseg.tcphdr->seqno = seqno = pcb->rcv_nxt;</div>
<div class="line"><a name="l01366"></a><span class="lineno"> 1366</span>  }</div>
<div class="line"><a name="l01367"></a><span class="lineno"> 1367</span>  <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01368"></a><span class="lineno"> 1368</span>  <span class="keywordflow">if</span> (TCP_SEQ_LT(seqno, pcb->rcv_nxt)) {</div>
<div class="line"><a name="l01369"></a><span class="lineno"> 1369</span>  <span class="comment">/* the whole segment is < rcv_nxt */</span></div>
<div class="line"><a name="l01370"></a><span class="lineno"> 1370</span>  <span class="comment">/* must be a duplicate of a packet that has already been correctly handled */</span></div>
<div class="line"><a name="l01371"></a><span class="lineno"> 1371</span>  </div>
<div class="line"><a name="l01372"></a><span class="lineno"> 1372</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_receive: duplicate seqno %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">"\n"</span>, seqno));</div>
<div class="line"><a name="l01373"></a><span class="lineno"> 1373</span>  tcp_ack_now(pcb);</div>
<div class="line"><a name="l01374"></a><span class="lineno"> 1374</span>  }</div>
<div class="line"><a name="l01375"></a><span class="lineno"> 1375</span>  }</div>
<div class="line"><a name="l01376"></a><span class="lineno"> 1376</span>  </div>
<div class="line"><a name="l01377"></a><span class="lineno"> 1377</span>  <span class="comment">/* The sequence number must be within the window (above rcv_nxt</span></div>
<div class="line"><a name="l01378"></a><span class="lineno"> 1378</span> <span class="comment"> and below rcv_nxt + rcv_wnd) in order to be further</span></div>
<div class="line"><a name="l01379"></a><span class="lineno"> 1379</span> <span class="comment"> processed. */</span></div>
<div class="line"><a name="l01380"></a><span class="lineno"> 1380</span>  <span class="keywordflow">if</span> (TCP_SEQ_BETWEEN(seqno, pcb->rcv_nxt,</div>
<div class="line"><a name="l01381"></a><span class="lineno"> 1381</span>  pcb->rcv_nxt + pcb->rcv_wnd - 1)) {</div>
<div class="line"><a name="l01382"></a><span class="lineno"> 1382</span>  <span class="keywordflow">if</span> (pcb->rcv_nxt == seqno) {</div>
<div class="line"><a name="l01383"></a><span class="lineno"> 1383</span>  <span class="comment">/* The incoming segment is the next in sequence. We check if</span></div>
<div class="line"><a name="l01384"></a><span class="lineno"> 1384</span> <span class="comment"> we have to trim the end of the segment and update rcv_nxt</span></div>
<div class="line"><a name="l01385"></a><span class="lineno"> 1385</span> <span class="comment"> and pass the data to the application. */</span></div>
<div class="line"><a name="l01386"></a><span class="lineno"> 1386</span>  tcplen = TCP_TCPLEN(&inseg);</div>
<div class="line"><a name="l01387"></a><span class="lineno"> 1387</span>  </div>
<div class="line"><a name="l01388"></a><span class="lineno"> 1388</span>  <span class="keywordflow">if</span> (tcplen > pcb->rcv_wnd) {</div>
<div class="line"><a name="l01389"></a><span class="lineno"> 1389</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>,</div>
<div class="line"><a name="l01390"></a><span class="lineno"> 1390</span>  (<span class="stringliteral">"tcp_receive: other end overran receive window"</span></div>
<div class="line"><a name="l01391"></a><span class="lineno"> 1391</span>  <span class="stringliteral">"seqno %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" len %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" right edge %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l01392"></a><span class="lineno"> 1392</span>  seqno, tcplen, pcb->rcv_nxt + pcb->rcv_wnd));</div>
<div class="line"><a name="l01393"></a><span class="lineno"> 1393</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(inseg.tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) {</div>
<div class="line"><a name="l01394"></a><span class="lineno"> 1394</span>  <span class="comment">/* Must remove the FIN from the header as we're trimming</span></div>
<div class="line"><a name="l01395"></a><span class="lineno"> 1395</span> <span class="comment"> * that byte of sequence-space from the packet */</span></div>
<div class="line"><a name="l01396"></a><span class="lineno"> 1396</span>  <a class="code" href="../../d9/d67/prot_2tcp_8h.html#afe7c917080459557c65071c4b13c8e12">TCPH_FLAGS_SET</a>(inseg.tcphdr, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(inseg.tcphdr) & ~(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)<a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>);</div>
<div class="line"><a name="l01397"></a><span class="lineno"> 1397</span>  }</div>
<div class="line"><a name="l01398"></a><span class="lineno"> 1398</span>  <span class="comment">/* Adjust length of segment to fit in the window. */</span></div>
<div class="line"><a name="l01399"></a><span class="lineno"> 1399</span>  TCPWND_CHECK16(pcb->rcv_wnd);</div>
<div class="line"><a name="l01400"></a><span class="lineno"> 1400</span>  inseg.len = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)pcb->rcv_wnd;</div>
<div class="line"><a name="l01401"></a><span class="lineno"> 1401</span>  if (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(inseg.tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a>) {</div>
<div class="line"><a name="l01402"></a><span class="lineno"> 1402</span>  inseg.len -= 1;</div>
<div class="line"><a name="l01403"></a><span class="lineno"> 1403</span>  }</div>
<div class="line"><a name="l01404"></a><span class="lineno"> 1404</span>  <a class="code" href="../../d7/d05/group__pbuf.html#ga50abfe830a33a1a47a562febee66015d">pbuf_realloc</a>(inseg.p, inseg.len);</div>
<div class="line"><a name="l01405"></a><span class="lineno"> 1405</span>  tcplen = TCP_TCPLEN(&inseg);</div>
<div class="line"><a name="l01406"></a><span class="lineno"> 1406</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_receive: segment not trimmed correctly to rcv_wnd\n"</span>,</div>
<div class="line"><a name="l01407"></a><span class="lineno"> 1407</span>  (seqno + tcplen) == (pcb->rcv_nxt + pcb->rcv_wnd));</div>
<div class="line"><a name="l01408"></a><span class="lineno"> 1408</span>  }</div>
<div class="line"><a name="l01409"></a><span class="lineno"> 1409</span> <span class="preprocessor">#if TCP_QUEUE_OOSEQ</span></div>
<div class="line"><a name="l01410"></a><span class="lineno"> 1410</span>  <span class="comment">/* Received in-sequence data, adjust ooseq data if:</span></div>
<div class="line"><a name="l01411"></a><span class="lineno"> 1411</span> <span class="comment"> - FIN has been received or</span></div>
<div class="line"><a name="l01412"></a><span class="lineno"> 1412</span> <span class="comment"> - inseq overlaps with ooseq */</span></div>
<div class="line"><a name="l01413"></a><span class="lineno"> 1413</span>  <span class="keywordflow">if</span> (pcb->ooseq != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01414"></a><span class="lineno"> 1414</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(inseg.tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) {</div>
<div class="line"><a name="l01415"></a><span class="lineno"> 1415</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>,</div>
<div class="line"><a name="l01416"></a><span class="lineno"> 1416</span>  (<span class="stringliteral">"tcp_receive: received in-order FIN, binning ooseq queue\n"</span>));</div>
<div class="line"><a name="l01417"></a><span class="lineno"> 1417</span>  <span class="comment">/* Received in-order FIN means anything that was received</span></div>
<div class="line"><a name="l01418"></a><span class="lineno"> 1418</span> <span class="comment"> * out of order must now have been received in-order, so</span></div>
<div class="line"><a name="l01419"></a><span class="lineno"> 1419</span> <span class="comment"> * bin the ooseq queue */</span></div>
<div class="line"><a name="l01420"></a><span class="lineno"> 1420</span>  <span class="keywordflow">while</span> (pcb->ooseq != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01421"></a><span class="lineno"> 1421</span>  <span class="keyword">struct </span>tcp_seg *old_ooseq = pcb->ooseq;</div>
<div class="line"><a name="l01422"></a><span class="lineno"> 1422</span>  pcb->ooseq = pcb->ooseq->next;</div>
<div class="line"><a name="l01423"></a><span class="lineno"> 1423</span>  tcp_seg_free(old_ooseq);</div>
<div class="line"><a name="l01424"></a><span class="lineno"> 1424</span>  }</div>
<div class="line"><a name="l01425"></a><span class="lineno"> 1425</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01426"></a><span class="lineno"> 1426</span>  next = pcb->ooseq;</div>
<div class="line"><a name="l01427"></a><span class="lineno"> 1427</span>  <span class="comment">/* Remove all segments on ooseq that are covered by inseg already.</span></div>
<div class="line"><a name="l01428"></a><span class="lineno"> 1428</span> <span class="comment"> * FIN is copied from ooseq to inseg if present. */</span></div>
<div class="line"><a name="l01429"></a><span class="lineno"> 1429</span>  <span class="keywordflow">while</span> (next &&</div>
<div class="line"><a name="l01430"></a><span class="lineno"> 1430</span>  TCP_SEQ_GEQ(seqno + tcplen,</div>
<div class="line"><a name="l01431"></a><span class="lineno"> 1431</span>  next->tcphdr->seqno + next->len)) {</div>
<div class="line"><a name="l01432"></a><span class="lineno"> 1432</span>  <span class="comment">/* inseg cannot have FIN here (already processed above) */</span></div>
<div class="line"><a name="l01433"></a><span class="lineno"> 1433</span>  <span class="keywordflow">if</span> ((<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(next->tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) != 0 &&</div>
<div class="line"><a name="l01434"></a><span class="lineno"> 1434</span>  (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(inseg.tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a>) == 0) {</div>
<div class="line"><a name="l01435"></a><span class="lineno"> 1435</span>  <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a42432f2dde6716ecb0087ccbc47cc75b">TCPH_SET_FLAG</a>(inseg.tcphdr, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>);</div>
<div class="line"><a name="l01436"></a><span class="lineno"> 1436</span>  tcplen = TCP_TCPLEN(&inseg);</div>
<div class="line"><a name="l01437"></a><span class="lineno"> 1437</span>  }</div>
<div class="line"><a name="l01438"></a><span class="lineno"> 1438</span>  prev = next;</div>
<div class="line"><a name="l01439"></a><span class="lineno"> 1439</span>  next = next->next;</div>
<div class="line"><a name="l01440"></a><span class="lineno"> 1440</span>  tcp_seg_free(prev);</div>
<div class="line"><a name="l01441"></a><span class="lineno"> 1441</span>  }</div>
<div class="line"><a name="l01442"></a><span class="lineno"> 1442</span>  <span class="comment">/* Now trim right side of inseg if it overlaps with the first</span></div>
<div class="line"><a name="l01443"></a><span class="lineno"> 1443</span> <span class="comment"> * segment on ooseq */</span></div>
<div class="line"><a name="l01444"></a><span class="lineno"> 1444</span>  <span class="keywordflow">if</span> (next &&</div>
<div class="line"><a name="l01445"></a><span class="lineno"> 1445</span>  TCP_SEQ_GT(seqno + tcplen,</div>
<div class="line"><a name="l01446"></a><span class="lineno"> 1446</span>  next->tcphdr->seqno)) {</div>
<div class="line"><a name="l01447"></a><span class="lineno"> 1447</span>  <span class="comment">/* inseg cannot have FIN here (already processed above) */</span></div>
<div class="line"><a name="l01448"></a><span class="lineno"> 1448</span>  inseg.len = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)(next->tcphdr->seqno - seqno);</div>
<div class="line"><a name="l01449"></a><span class="lineno"> 1449</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(inseg.tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a>) {</div>
<div class="line"><a name="l01450"></a><span class="lineno"> 1450</span>  inseg.len -= 1;</div>
<div class="line"><a name="l01451"></a><span class="lineno"> 1451</span>  }</div>
<div class="line"><a name="l01452"></a><span class="lineno"> 1452</span>  <a class="code" href="../../d7/d05/group__pbuf.html#ga50abfe830a33a1a47a562febee66015d">pbuf_realloc</a>(inseg.p, inseg.len);</div>
<div class="line"><a name="l01453"></a><span class="lineno"> 1453</span>  tcplen = TCP_TCPLEN(&inseg);</div>
<div class="line"><a name="l01454"></a><span class="lineno"> 1454</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_receive: segment not trimmed correctly to ooseq queue\n"</span>,</div>
<div class="line"><a name="l01455"></a><span class="lineno"> 1455</span>  (seqno + tcplen) == next->tcphdr->seqno);</div>
<div class="line"><a name="l01456"></a><span class="lineno"> 1456</span>  }</div>
<div class="line"><a name="l01457"></a><span class="lineno"> 1457</span>  pcb->ooseq = next;</div>
<div class="line"><a name="l01458"></a><span class="lineno"> 1458</span>  }</div>
<div class="line"><a name="l01459"></a><span class="lineno"> 1459</span>  }</div>
<div class="line"><a name="l01460"></a><span class="lineno"> 1460</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_QUEUE_OOSEQ */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01461"></a><span class="lineno"> 1461</span>  </div>
<div class="line"><a name="l01462"></a><span class="lineno"> 1462</span>  pcb->rcv_nxt = seqno + tcplen;</div>
<div class="line"><a name="l01463"></a><span class="lineno"> 1463</span>  </div>
<div class="line"><a name="l01464"></a><span class="lineno"> 1464</span>  <span class="comment">/* Update the receiver's (our) window. */</span></div>
<div class="line"><a name="l01465"></a><span class="lineno"> 1465</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_receive: tcplen > rcv_wnd\n"</span>, pcb->rcv_wnd >= tcplen);</div>
<div class="line"><a name="l01466"></a><span class="lineno"> 1466</span>  pcb->rcv_wnd -= tcplen;</div>
<div class="line"><a name="l01467"></a><span class="lineno"> 1467</span>  </div>
<div class="line"><a name="l01468"></a><span class="lineno"> 1468</span>  tcp_update_rcv_ann_wnd(pcb);</div>
<div class="line"><a name="l01469"></a><span class="lineno"> 1469</span>  </div>
<div class="line"><a name="l01470"></a><span class="lineno"> 1470</span>  <span class="comment">/* If there is data in the segment, we make preparations to</span></div>
<div class="line"><a name="l01471"></a><span class="lineno"> 1471</span> <span class="comment"> pass this up to the application. The ->recv_data variable</span></div>
<div class="line"><a name="l01472"></a><span class="lineno"> 1472</span> <span class="comment"> is used for holding the pbuf that goes to the</span></div>
<div class="line"><a name="l01473"></a><span class="lineno"> 1473</span> <span class="comment"> application. The code for reassembling out-of-sequence data</span></div>
<div class="line"><a name="l01474"></a><span class="lineno"> 1474</span> <span class="comment"> chains its data on this pbuf as well.</span></div>
<div class="line"><a name="l01475"></a><span class="lineno"> 1475</span> <span class="comment"></span> </div>
<div class="line"><a name="l01476"></a><span class="lineno"> 1476</span> <span class="comment"> If the segment was a FIN, we set the TF_GOT_FIN flag that will</span></div>
<div class="line"><a name="l01477"></a><span class="lineno"> 1477</span> <span class="comment"> be used to indicate to the application that the remote side has</span></div>
<div class="line"><a name="l01478"></a><span class="lineno"> 1478</span> <span class="comment"> closed its end of the connection. */</span></div>
<div class="line"><a name="l01479"></a><span class="lineno"> 1479</span>  <span class="keywordflow">if</span> (inseg.p->tot_len > 0) {</div>
<div class="line"><a name="l01480"></a><span class="lineno"> 1480</span>  recv_data = inseg.p;</div>
<div class="line"><a name="l01481"></a><span class="lineno"> 1481</span>  <span class="comment">/* Since this pbuf now is the responsibility of the</span></div>
<div class="line"><a name="l01482"></a><span class="lineno"> 1482</span> <span class="comment"> application, we delete our reference to it so that we won't</span></div>
<div class="line"><a name="l01483"></a><span class="lineno"> 1483</span> <span class="comment"> (mistakingly) deallocate it. */</span></div>
<div class="line"><a name="l01484"></a><span class="lineno"> 1484</span>  inseg.p = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l01485"></a><span class="lineno"> 1485</span>  }</div>
<div class="line"><a name="l01486"></a><span class="lineno"> 1486</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(inseg.tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) {</div>
<div class="line"><a name="l01487"></a><span class="lineno"> 1487</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_receive: received FIN.\n"</span>));</div>
<div class="line"><a name="l01488"></a><span class="lineno"> 1488</span>  recv_flags |= TF_GOT_FIN;</div>
<div class="line"><a name="l01489"></a><span class="lineno"> 1489</span>  }</div>
<div class="line"><a name="l01490"></a><span class="lineno"> 1490</span>  </div>
<div class="line"><a name="l01491"></a><span class="lineno"> 1491</span> <span class="preprocessor">#if TCP_QUEUE_OOSEQ</span></div>
<div class="line"><a name="l01492"></a><span class="lineno"> 1492</span>  <span class="comment">/* We now check if we have segments on the ->ooseq queue that</span></div>
<div class="line"><a name="l01493"></a><span class="lineno"> 1493</span> <span class="comment"> are now in sequence. */</span></div>
<div class="line"><a name="l01494"></a><span class="lineno"> 1494</span>  <span class="keywordflow">while</span> (pcb->ooseq != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> &&</div>
<div class="line"><a name="l01495"></a><span class="lineno"> 1495</span>  pcb->ooseq->tcphdr->seqno == pcb->rcv_nxt) {</div>
<div class="line"><a name="l01496"></a><span class="lineno"> 1496</span>  </div>
<div class="line"><a name="l01497"></a><span class="lineno"> 1497</span>  cseg = pcb->ooseq;</div>
<div class="line"><a name="l01498"></a><span class="lineno"> 1498</span>  seqno = pcb->ooseq->tcphdr->seqno;</div>
<div class="line"><a name="l01499"></a><span class="lineno"> 1499</span>  </div>
<div class="line"><a name="l01500"></a><span class="lineno"> 1500</span>  pcb->rcv_nxt += TCP_TCPLEN(cseg);</div>
<div class="line"><a name="l01501"></a><span class="lineno"> 1501</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_receive: ooseq tcplen > rcv_wnd\n"</span>,</div>
<div class="line"><a name="l01502"></a><span class="lineno"> 1502</span>  pcb->rcv_wnd >= TCP_TCPLEN(cseg));</div>
<div class="line"><a name="l01503"></a><span class="lineno"> 1503</span>  pcb->rcv_wnd -= TCP_TCPLEN(cseg);</div>
<div class="line"><a name="l01504"></a><span class="lineno"> 1504</span>  </div>
<div class="line"><a name="l01505"></a><span class="lineno"> 1505</span>  tcp_update_rcv_ann_wnd(pcb);</div>
<div class="line"><a name="l01506"></a><span class="lineno"> 1506</span>  </div>
<div class="line"><a name="l01507"></a><span class="lineno"> 1507</span>  <span class="keywordflow">if</span> (cseg->p->tot_len > 0) {</div>
<div class="line"><a name="l01508"></a><span class="lineno"> 1508</span>  <span class="comment">/* Chain this pbuf onto the pbuf that we will pass to</span></div>
<div class="line"><a name="l01509"></a><span class="lineno"> 1509</span> <span class="comment"> the application. */</span></div>
<div class="line"><a name="l01510"></a><span class="lineno"> 1510</span>  <span class="comment">/* With window scaling, this can overflow recv_data->tot_len, but</span></div>
<div class="line"><a name="l01511"></a><span class="lineno"> 1511</span> <span class="comment"> that's not a problem since we explicitly fix that before passing</span></div>
<div class="line"><a name="l01512"></a><span class="lineno"> 1512</span> <span class="comment"> recv_data to the application. */</span></div>
<div class="line"><a name="l01513"></a><span class="lineno"> 1513</span>  <span class="keywordflow">if</span> (recv_data) {</div>
<div class="line"><a name="l01514"></a><span class="lineno"> 1514</span>  <a class="code" href="../../d7/d05/group__pbuf.html#ga82429084fe29015509c9b4a072707cd4">pbuf_cat</a>(recv_data, cseg->p);</div>
<div class="line"><a name="l01515"></a><span class="lineno"> 1515</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01516"></a><span class="lineno"> 1516</span>  recv_data = cseg->p;</div>
<div class="line"><a name="l01517"></a><span class="lineno"> 1517</span>  }</div>
<div class="line"><a name="l01518"></a><span class="lineno"> 1518</span>  cseg->p = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l01519"></a><span class="lineno"> 1519</span>  }</div>
<div class="line"><a name="l01520"></a><span class="lineno"> 1520</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(cseg->tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) {</div>
<div class="line"><a name="l01521"></a><span class="lineno"> 1521</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_receive: dequeued FIN.\n"</span>));</div>
<div class="line"><a name="l01522"></a><span class="lineno"> 1522</span>  recv_flags |= TF_GOT_FIN;</div>
<div class="line"><a name="l01523"></a><span class="lineno"> 1523</span>  <span class="keywordflow">if</span> (pcb->state == ESTABLISHED) { <span class="comment">/* force passive close or we can move to active close */</span></div>
<div class="line"><a name="l01524"></a><span class="lineno"> 1524</span>  pcb->state = CLOSE_WAIT;</div>
<div class="line"><a name="l01525"></a><span class="lineno"> 1525</span>  }</div>
<div class="line"><a name="l01526"></a><span class="lineno"> 1526</span>  }</div>
<div class="line"><a name="l01527"></a><span class="lineno"> 1527</span>  </div>
<div class="line"><a name="l01528"></a><span class="lineno"> 1528</span>  pcb->ooseq = cseg->next;</div>
<div class="line"><a name="l01529"></a><span class="lineno"> 1529</span>  tcp_seg_free(cseg);</div>
<div class="line"><a name="l01530"></a><span class="lineno"> 1530</span>  }</div>
<div class="line"><a name="l01531"></a><span class="lineno"> 1531</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_QUEUE_OOSEQ */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01532"></a><span class="lineno"> 1532</span>  </div>
<div class="line"><a name="l01533"></a><span class="lineno"> 1533</span>  </div>
<div class="line"><a name="l01534"></a><span class="lineno"> 1534</span>  <span class="comment">/* Acknowledge the segment(s). */</span></div>
<div class="line"><a name="l01535"></a><span class="lineno"> 1535</span>  tcp_ack(pcb);</div>
<div class="line"><a name="l01536"></a><span class="lineno"> 1536</span>  </div>
<div class="line"><a name="l01537"></a><span class="lineno"> 1537</span> <span class="preprocessor">#if LWIP_IPV6 && LWIP_ND6_TCP_REACHABILITY_HINTS</span></div>
<div class="line"><a name="l01538"></a><span class="lineno"> 1538</span>  <span class="keywordflow">if</span> (ip_current_is_v6()) {</div>
<div class="line"><a name="l01539"></a><span class="lineno"> 1539</span>  <span class="comment">/* Inform neighbor reachability of forward progress. */</span></div>
<div class="line"><a name="l01540"></a><span class="lineno"> 1540</span>  nd6_reachability_hint(ip6_current_src_addr());</div>
<div class="line"><a name="l01541"></a><span class="lineno"> 1541</span>  }</div>
<div class="line"><a name="l01542"></a><span class="lineno"> 1542</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_IPV6 && LWIP_ND6_TCP_REACHABILITY_HINTS*/</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01543"></a><span class="lineno"> 1543</span>  </div>
<div class="line"><a name="l01544"></a><span class="lineno"> 1544</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01545"></a><span class="lineno"> 1545</span>  <span class="comment">/* We get here if the incoming segment is out-of-sequence. */</span></div>
<div class="line"><a name="l01546"></a><span class="lineno"> 1546</span>  tcp_send_empty_ack(pcb);</div>
<div class="line"><a name="l01547"></a><span class="lineno"> 1547</span> <span class="preprocessor">#if TCP_QUEUE_OOSEQ</span></div>
<div class="line"><a name="l01548"></a><span class="lineno"> 1548</span>  <span class="comment">/* We queue the segment on the ->ooseq queue. */</span></div>
<div class="line"><a name="l01549"></a><span class="lineno"> 1549</span>  <span class="keywordflow">if</span> (pcb->ooseq == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01550"></a><span class="lineno"> 1550</span>  pcb->ooseq = tcp_seg_copy(&inseg);</div>
<div class="line"><a name="l01551"></a><span class="lineno"> 1551</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01552"></a><span class="lineno"> 1552</span>  <span class="comment">/* If the queue is not empty, we walk through the queue and</span></div>
<div class="line"><a name="l01553"></a><span class="lineno"> 1553</span> <span class="comment"> try to find a place where the sequence number of the</span></div>
<div class="line"><a name="l01554"></a><span class="lineno"> 1554</span> <span class="comment"> incoming segment is between the sequence numbers of the</span></div>
<div class="line"><a name="l01555"></a><span class="lineno"> 1555</span> <span class="comment"> previous and the next segment on the ->ooseq queue. That is</span></div>
<div class="line"><a name="l01556"></a><span class="lineno"> 1556</span> <span class="comment"> the place where we put the incoming segment. If needed, we</span></div>
<div class="line"><a name="l01557"></a><span class="lineno"> 1557</span> <span class="comment"> trim the second edges of the previous and the incoming</span></div>
<div class="line"><a name="l01558"></a><span class="lineno"> 1558</span> <span class="comment"> segment so that it will fit into the sequence.</span></div>
<div class="line"><a name="l01559"></a><span class="lineno"> 1559</span> <span class="comment"></span> </div>
<div class="line"><a name="l01560"></a><span class="lineno"> 1560</span> <span class="comment"> If the incoming segment has the same sequence number as a</span></div>
<div class="line"><a name="l01561"></a><span class="lineno"> 1561</span> <span class="comment"> segment on the ->ooseq queue, we discard the segment that</span></div>
<div class="line"><a name="l01562"></a><span class="lineno"> 1562</span> <span class="comment"> contains less data. */</span></div>
<div class="line"><a name="l01563"></a><span class="lineno"> 1563</span>  </div>
<div class="line"><a name="l01564"></a><span class="lineno"> 1564</span>  prev = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l01565"></a><span class="lineno"> 1565</span>  <span class="keywordflow">for</span> (next = pcb->ooseq; next != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>; next = next->next) {</div>
<div class="line"><a name="l01566"></a><span class="lineno"> 1566</span>  <span class="keywordflow">if</span> (seqno == next->tcphdr->seqno) {</div>
<div class="line"><a name="l01567"></a><span class="lineno"> 1567</span>  <span class="comment">/* The sequence number of the incoming segment is the</span></div>
<div class="line"><a name="l01568"></a><span class="lineno"> 1568</span> <span class="comment"> same as the sequence number of the segment on</span></div>
<div class="line"><a name="l01569"></a><span class="lineno"> 1569</span> <span class="comment"> ->ooseq. We check the lengths to see which one to</span></div>
<div class="line"><a name="l01570"></a><span class="lineno"> 1570</span> <span class="comment"> discard. */</span></div>
<div class="line"><a name="l01571"></a><span class="lineno"> 1571</span>  <span class="keywordflow">if</span> (inseg.len > next->len) {</div>
<div class="line"><a name="l01572"></a><span class="lineno"> 1572</span>  <span class="comment">/* The incoming segment is larger than the old</span></div>
<div class="line"><a name="l01573"></a><span class="lineno"> 1573</span> <span class="comment"> segment. We replace some segments with the new</span></div>
<div class="line"><a name="l01574"></a><span class="lineno"> 1574</span> <span class="comment"> one. */</span></div>
<div class="line"><a name="l01575"></a><span class="lineno"> 1575</span>  cseg = tcp_seg_copy(&inseg);</div>
<div class="line"><a name="l01576"></a><span class="lineno"> 1576</span>  <span class="keywordflow">if</span> (cseg != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01577"></a><span class="lineno"> 1577</span>  <span class="keywordflow">if</span> (prev != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01578"></a><span class="lineno"> 1578</span>  prev->next = cseg;</div>
<div class="line"><a name="l01579"></a><span class="lineno"> 1579</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01580"></a><span class="lineno"> 1580</span>  pcb->ooseq = cseg;</div>
<div class="line"><a name="l01581"></a><span class="lineno"> 1581</span>  }</div>
<div class="line"><a name="l01582"></a><span class="lineno"> 1582</span>  tcp_oos_insert_segment(cseg, next);</div>
<div class="line"><a name="l01583"></a><span class="lineno"> 1583</span>  }</div>
<div class="line"><a name="l01584"></a><span class="lineno"> 1584</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l01585"></a><span class="lineno"> 1585</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01586"></a><span class="lineno"> 1586</span>  <span class="comment">/* Either the lengths are the same or the incoming</span></div>
<div class="line"><a name="l01587"></a><span class="lineno"> 1587</span> <span class="comment"> segment was smaller than the old one; in either</span></div>
<div class="line"><a name="l01588"></a><span class="lineno"> 1588</span> <span class="comment"> case, we ditch the incoming segment. */</span></div>
<div class="line"><a name="l01589"></a><span class="lineno"> 1589</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l01590"></a><span class="lineno"> 1590</span>  }</div>
<div class="line"><a name="l01591"></a><span class="lineno"> 1591</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01592"></a><span class="lineno"> 1592</span>  <span class="keywordflow">if</span> (prev == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01593"></a><span class="lineno"> 1593</span>  <span class="keywordflow">if</span> (TCP_SEQ_LT(seqno, next->tcphdr->seqno)) {</div>
<div class="line"><a name="l01594"></a><span class="lineno"> 1594</span>  <span class="comment">/* The sequence number of the incoming segment is lower</span></div>
<div class="line"><a name="l01595"></a><span class="lineno"> 1595</span> <span class="comment"> than the sequence number of the first segment on the</span></div>
<div class="line"><a name="l01596"></a><span class="lineno"> 1596</span> <span class="comment"> queue. We put the incoming segment first on the</span></div>
<div class="line"><a name="l01597"></a><span class="lineno"> 1597</span> <span class="comment"> queue. */</span></div>
<div class="line"><a name="l01598"></a><span class="lineno"> 1598</span>  cseg = tcp_seg_copy(&inseg);</div>
<div class="line"><a name="l01599"></a><span class="lineno"> 1599</span>  <span class="keywordflow">if</span> (cseg != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01600"></a><span class="lineno"> 1600</span>  pcb->ooseq = cseg;</div>
<div class="line"><a name="l01601"></a><span class="lineno"> 1601</span>  tcp_oos_insert_segment(cseg, next);</div>
<div class="line"><a name="l01602"></a><span class="lineno"> 1602</span>  }</div>
<div class="line"><a name="l01603"></a><span class="lineno"> 1603</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l01604"></a><span class="lineno"> 1604</span>  }</div>
<div class="line"><a name="l01605"></a><span class="lineno"> 1605</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01606"></a><span class="lineno"> 1606</span>  <span class="comment">/*if (TCP_SEQ_LT(prev->tcphdr->seqno, seqno) &&</span></div>
<div class="line"><a name="l01607"></a><span class="lineno"> 1607</span> <span class="comment"> TCP_SEQ_LT(seqno, next->tcphdr->seqno)) {*/</span></div>
<div class="line"><a name="l01608"></a><span class="lineno"> 1608</span>  <span class="keywordflow">if</span> (TCP_SEQ_BETWEEN(seqno, prev->tcphdr->seqno+1, next->tcphdr->seqno-1)) {</div>
<div class="line"><a name="l01609"></a><span class="lineno"> 1609</span>  <span class="comment">/* The sequence number of the incoming segment is in</span></div>
<div class="line"><a name="l01610"></a><span class="lineno"> 1610</span> <span class="comment"> between the sequence numbers of the previous and</span></div>
<div class="line"><a name="l01611"></a><span class="lineno"> 1611</span> <span class="comment"> the next segment on ->ooseq. We trim trim the previous</span></div>
<div class="line"><a name="l01612"></a><span class="lineno"> 1612</span> <span class="comment"> segment, delete next segments that included in received segment</span></div>
<div class="line"><a name="l01613"></a><span class="lineno"> 1613</span> <span class="comment"> and trim received, if needed. */</span></div>
<div class="line"><a name="l01614"></a><span class="lineno"> 1614</span>  cseg = tcp_seg_copy(&inseg);</div>
<div class="line"><a name="l01615"></a><span class="lineno"> 1615</span>  <span class="keywordflow">if</span> (cseg != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01616"></a><span class="lineno"> 1616</span>  <span class="keywordflow">if</span> (TCP_SEQ_GT(prev->tcphdr->seqno + prev->len, seqno)) {</div>
<div class="line"><a name="l01617"></a><span class="lineno"> 1617</span>  <span class="comment">/* We need to trim the prev segment. */</span></div>
<div class="line"><a name="l01618"></a><span class="lineno"> 1618</span>  prev->len = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)(seqno - prev->tcphdr->seqno);</div>
<div class="line"><a name="l01619"></a><span class="lineno"> 1619</span>  <a class="code" href="../../d7/d05/group__pbuf.html#ga50abfe830a33a1a47a562febee66015d">pbuf_realloc</a>(prev->p, prev->len);</div>
<div class="line"><a name="l01620"></a><span class="lineno"> 1620</span>  }</div>
<div class="line"><a name="l01621"></a><span class="lineno"> 1621</span>  prev->next = cseg;</div>
<div class="line"><a name="l01622"></a><span class="lineno"> 1622</span>  tcp_oos_insert_segment(cseg, next);</div>
<div class="line"><a name="l01623"></a><span class="lineno"> 1623</span>  }</div>
<div class="line"><a name="l01624"></a><span class="lineno"> 1624</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l01625"></a><span class="lineno"> 1625</span>  }</div>
<div class="line"><a name="l01626"></a><span class="lineno"> 1626</span>  }</div>
<div class="line"><a name="l01627"></a><span class="lineno"> 1627</span>  <span class="comment">/* If the "next" segment is the last segment on the</span></div>
<div class="line"><a name="l01628"></a><span class="lineno"> 1628</span> <span class="comment"> ooseq queue, we add the incoming segment to the end</span></div>
<div class="line"><a name="l01629"></a><span class="lineno"> 1629</span> <span class="comment"> of the list. */</span></div>
<div class="line"><a name="l01630"></a><span class="lineno"> 1630</span>  <span class="keywordflow">if</span> (next->next == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> &&</div>
<div class="line"><a name="l01631"></a><span class="lineno"> 1631</span>  TCP_SEQ_GT(seqno, next->tcphdr->seqno)) {</div>
<div class="line"><a name="l01632"></a><span class="lineno"> 1632</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(next->tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) {</div>
<div class="line"><a name="l01633"></a><span class="lineno"> 1633</span>  <span class="comment">/* segment "next" already contains all data */</span></div>
<div class="line"><a name="l01634"></a><span class="lineno"> 1634</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l01635"></a><span class="lineno"> 1635</span>  }</div>
<div class="line"><a name="l01636"></a><span class="lineno"> 1636</span>  next->next = tcp_seg_copy(&inseg);</div>
<div class="line"><a name="l01637"></a><span class="lineno"> 1637</span>  <span class="keywordflow">if</span> (next->next != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01638"></a><span class="lineno"> 1638</span>  <span class="keywordflow">if</span> (TCP_SEQ_GT(next->tcphdr->seqno + next->len, seqno)) {</div>
<div class="line"><a name="l01639"></a><span class="lineno"> 1639</span>  <span class="comment">/* We need to trim the last segment. */</span></div>
<div class="line"><a name="l01640"></a><span class="lineno"> 1640</span>  next->len = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)(seqno - next->tcphdr->seqno);</div>
<div class="line"><a name="l01641"></a><span class="lineno"> 1641</span>  <a class="code" href="../../d7/d05/group__pbuf.html#ga50abfe830a33a1a47a562febee66015d">pbuf_realloc</a>(next->p, next->len);</div>
<div class="line"><a name="l01642"></a><span class="lineno"> 1642</span>  }</div>
<div class="line"><a name="l01643"></a><span class="lineno"> 1643</span>  <span class="comment">/* check if the remote side overruns our receive window */</span></div>
<div class="line"><a name="l01644"></a><span class="lineno"> 1644</span>  <span class="keywordflow">if</span> (TCP_SEQ_GT((<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a>)tcplen + seqno, pcb->rcv_nxt + (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a>)pcb->rcv_wnd)) {</div>
<div class="line"><a name="l01645"></a><span class="lineno"> 1645</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>,</div>
<div class="line"><a name="l01646"></a><span class="lineno"> 1646</span>  (<span class="stringliteral">"tcp_receive: other end overran receive window"</span></div>
<div class="line"><a name="l01647"></a><span class="lineno"> 1647</span>  <span class="stringliteral">"seqno %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" len %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" right edge %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l01648"></a><span class="lineno"> 1648</span>  seqno, tcplen, pcb->rcv_nxt + pcb->rcv_wnd));</div>
<div class="line"><a name="l01649"></a><span class="lineno"> 1649</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(next->next->tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) {</div>
<div class="line"><a name="l01650"></a><span class="lineno"> 1650</span>  <span class="comment">/* Must remove the FIN from the header as we're trimming</span></div>
<div class="line"><a name="l01651"></a><span class="lineno"> 1651</span> <span class="comment"> * that byte of sequence-space from the packet */</span></div>
<div class="line"><a name="l01652"></a><span class="lineno"> 1652</span>  <a class="code" href="../../d9/d67/prot_2tcp_8h.html#afe7c917080459557c65071c4b13c8e12">TCPH_FLAGS_SET</a>(next->next->tcphdr, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(next->next->tcphdr) & ~<a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>);</div>
<div class="line"><a name="l01653"></a><span class="lineno"> 1653</span>  }</div>
<div class="line"><a name="l01654"></a><span class="lineno"> 1654</span>  <span class="comment">/* Adjust length of segment to fit in the window. */</span></div>
<div class="line"><a name="l01655"></a><span class="lineno"> 1655</span>  next->next->len = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)(pcb->rcv_nxt + pcb->rcv_wnd - seqno);</div>
<div class="line"><a name="l01656"></a><span class="lineno"> 1656</span>  <a class="code" href="../../d7/d05/group__pbuf.html#ga50abfe830a33a1a47a562febee66015d">pbuf_realloc</a>(next->next->p, next->next->len);</div>
<div class="line"><a name="l01657"></a><span class="lineno"> 1657</span>  tcplen = TCP_TCPLEN(next->next);</div>
<div class="line"><a name="l01658"></a><span class="lineno"> 1658</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_receive: segment not trimmed correctly to rcv_wnd\n"</span>,</div>
<div class="line"><a name="l01659"></a><span class="lineno"> 1659</span>  (seqno + tcplen) == (pcb->rcv_nxt + pcb->rcv_wnd));</div>
<div class="line"><a name="l01660"></a><span class="lineno"> 1660</span>  }</div>
<div class="line"><a name="l01661"></a><span class="lineno"> 1661</span>  }</div>
<div class="line"><a name="l01662"></a><span class="lineno"> 1662</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l01663"></a><span class="lineno"> 1663</span>  }</div>
<div class="line"><a name="l01664"></a><span class="lineno"> 1664</span>  }</div>
<div class="line"><a name="l01665"></a><span class="lineno"> 1665</span>  prev = next;</div>
<div class="line"><a name="l01666"></a><span class="lineno"> 1666</span>  }</div>
<div class="line"><a name="l01667"></a><span class="lineno"> 1667</span>  }</div>
<div class="line"><a name="l01668"></a><span class="lineno"> 1668</span> <span class="preprocessor">#if TCP_OOSEQ_MAX_BYTES || TCP_OOSEQ_MAX_PBUFS</span></div>
<div class="line"><a name="l01669"></a><span class="lineno"> 1669</span>  <span class="comment">/* Check that the data on ooseq doesn't exceed one of the limits</span></div>
<div class="line"><a name="l01670"></a><span class="lineno"> 1670</span> <span class="comment"> and throw away everything above that limit. */</span></div>
<div class="line"><a name="l01671"></a><span class="lineno"> 1671</span>  ooseq_blen = 0;</div>
<div class="line"><a name="l01672"></a><span class="lineno"> 1672</span>  ooseq_qlen = 0;</div>
<div class="line"><a name="l01673"></a><span class="lineno"> 1673</span>  prev = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l01674"></a><span class="lineno"> 1674</span>  <span class="keywordflow">for</span> (next = pcb->ooseq; next != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>; prev = next, next = next->next) {</div>
<div class="line"><a name="l01675"></a><span class="lineno"> 1675</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p = <a class="code" href="../../d9/db8/structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>->p;</div>
<div class="line"><a name="l01676"></a><span class="lineno"> 1676</span>  ooseq_blen += p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a>;</div>
<div class="line"><a name="l01677"></a><span class="lineno"> 1677</span>  ooseq_qlen += <a class="code" href="../../d0/d35/pbuf_8h.html#a5df7ac5ae59012fe9aeddba375a72190">pbuf_clen</a>(p);</div>
<div class="line"><a name="l01678"></a><span class="lineno"> 1678</span>  <span class="keywordflow">if</span> ((ooseq_blen > <a class="code" href="../../d2/d78/lwipopts_8h.html#a9d6d3219bb5fc0bc760a64114de13c25">TCP_OOSEQ_MAX_BYTES</a>) ||</div>
<div class="line"><a name="l01679"></a><span class="lineno"> 1679</span>  (ooseq_qlen > <a class="code" href="../../d2/d78/lwipopts_8h.html#a1f57d3859c4556f785708e5dc440617e">TCP_OOSEQ_MAX_PBUFS</a>)) {</div>
<div class="line"><a name="l01680"></a><span class="lineno"> 1680</span>  <span class="comment">/* too much ooseq data, dump this and everything after it */</span></div>
<div class="line"><a name="l01681"></a><span class="lineno"> 1681</span>  tcp_segs_free(<a class="code" href="../../d9/db8/structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>);</div>
<div class="line"><a name="l01682"></a><span class="lineno"> 1682</span>  <span class="keywordflow">if</span> (prev == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01683"></a><span class="lineno"> 1683</span>  <span class="comment">/* first ooseq segment is too much, dump the whole queue */</span></div>
<div class="line"><a name="l01684"></a><span class="lineno"> 1684</span>  pcb->ooseq = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l01685"></a><span class="lineno"> 1685</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01686"></a><span class="lineno"> 1686</span>  <span class="comment">/* just dump 'next' and everything after it */</span></div>
<div class="line"><a name="l01687"></a><span class="lineno"> 1687</span>  prev->next = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l01688"></a><span class="lineno"> 1688</span>  }</div>
<div class="line"><a name="l01689"></a><span class="lineno"> 1689</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l01690"></a><span class="lineno"> 1690</span>  }</div>
<div class="line"><a name="l01691"></a><span class="lineno"> 1691</span>  }</div>
<div class="line"><a name="l01692"></a><span class="lineno"> 1692</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OOSEQ_MAX_BYTES || TCP_OOSEQ_MAX_PBUFS */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01693"></a><span class="lineno"> 1693</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_QUEUE_OOSEQ */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01694"></a><span class="lineno"> 1694</span>  }</div>
<div class="line"><a name="l01695"></a><span class="lineno"> 1695</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01696"></a><span class="lineno"> 1696</span>  <span class="comment">/* The incoming segment is not within the window. */</span></div>
<div class="line"><a name="l01697"></a><span class="lineno"> 1697</span>  tcp_send_empty_ack(pcb);</div>
<div class="line"><a name="l01698"></a><span class="lineno"> 1698</span>  }</div>
<div class="line"><a name="l01699"></a><span class="lineno"> 1699</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01700"></a><span class="lineno"> 1700</span>  <span class="comment">/* Segments with length 0 is taken care of here. Segments that</span></div>
<div class="line"><a name="l01701"></a><span class="lineno"> 1701</span> <span class="comment"> fall out of the window are ACKed. */</span></div>
<div class="line"><a name="l01702"></a><span class="lineno"> 1702</span>  <span class="keywordflow">if</span> (!TCP_SEQ_BETWEEN(seqno, pcb->rcv_nxt, pcb->rcv_nxt + pcb->rcv_wnd - 1)) {</div>
<div class="line"><a name="l01703"></a><span class="lineno"> 1703</span>  tcp_ack_now(pcb);</div>
<div class="line"><a name="l01704"></a><span class="lineno"> 1704</span>  }</div>
<div class="line"><a name="l01705"></a><span class="lineno"> 1705</span>  }</div>
<div class="line"><a name="l01706"></a><span class="lineno"> 1706</span> }</div>
<div class="line"><a name="l01707"></a><span class="lineno"> 1707</span>  </div>
<div class="line"><a name="l01708"></a><span class="lineno"> 1708</span> <span class="keyword">static</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a></div>
<div class="line"><a name="l01709"></a><span class="lineno"> 1709</span> tcp_getoptbyte(<span class="keywordtype">void</span>)</div>
<div class="line"><a name="l01710"></a><span class="lineno"> 1710</span> {</div>
<div class="line"><a name="l01711"></a><span class="lineno"> 1711</span>  <span class="keywordflow">if</span> ((tcphdr_opt2 == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) || (tcp_optidx < tcphdr_opt1len)) {</div>
<div class="line"><a name="l01712"></a><span class="lineno"> 1712</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>* opts = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)tcphdr + <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5758db371d6daa394d178429b7c94c2a">TCP_HLEN</a>;</div>
<div class="line"><a name="l01713"></a><span class="lineno"> 1713</span>  <span class="keywordflow">return</span> opts[tcp_optidx++];</div>
<div class="line"><a name="l01714"></a><span class="lineno"> 1714</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01715"></a><span class="lineno"> 1715</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> idx = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>)(tcp_optidx++ - tcphdr_opt1len);</div>
<div class="line"><a name="l01716"></a><span class="lineno"> 1716</span>  <span class="keywordflow">return</span> tcphdr_opt2[idx];</div>
<div class="line"><a name="l01717"></a><span class="lineno"> 1717</span>  }</div>
<div class="line"><a name="l01718"></a><span class="lineno"> 1718</span> }</div>
<div class="line"><a name="l01719"></a><span class="lineno"> 1719</span>  </div>
<div class="line"><a name="l01728"></a><span class="lineno"> 1728</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l01729"></a><span class="lineno"> 1729</span> tcp_parseopt(<span class="keyword">struct</span> tcp_pcb *pcb)</div>
<div class="line"><a name="l01730"></a><span class="lineno"> 1730</span> {</div>
<div class="line"><a name="l01731"></a><span class="lineno"> 1731</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> data;</div>
<div class="line"><a name="l01732"></a><span class="lineno"> 1732</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> mss;</div>
<div class="line"><a name="l01733"></a><span class="lineno"> 1733</span> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS</span></div>
<div class="line"><a name="l01734"></a><span class="lineno"> 1734</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> tsval;</div>
<div class="line"><a name="l01735"></a><span class="lineno"> 1735</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l01736"></a><span class="lineno"> 1736</span>  </div>
<div class="line"><a name="l01737"></a><span class="lineno"> 1737</span>  <span class="comment">/* Parse the TCP MSS option, if present. */</span></div>
<div class="line"><a name="l01738"></a><span class="lineno"> 1738</span>  <span class="keywordflow">if</span> (tcphdr_optlen != 0) {</div>
<div class="line"><a name="l01739"></a><span class="lineno"> 1739</span>  <span class="keywordflow">for</span> (tcp_optidx = 0; tcp_optidx < tcphdr_optlen; ) {</div>
<div class="line"><a name="l01740"></a><span class="lineno"> 1740</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> opt = tcp_getoptbyte();</div>
<div class="line"><a name="l01741"></a><span class="lineno"> 1741</span>  <span class="keywordflow">switch</span> (opt) {</div>
<div class="line"><a name="l01742"></a><span class="lineno"> 1742</span>  <span class="keywordflow">case</span> LWIP_TCP_OPT_EOL:</div>
<div class="line"><a name="l01743"></a><span class="lineno"> 1743</span>  <span class="comment">/* End of options. */</span></div>
<div class="line"><a name="l01744"></a><span class="lineno"> 1744</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_parseopt: EOL\n"</span>));</div>
<div class="line"><a name="l01745"></a><span class="lineno"> 1745</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l01746"></a><span class="lineno"> 1746</span>  <span class="keywordflow">case</span> LWIP_TCP_OPT_NOP:</div>
<div class="line"><a name="l01747"></a><span class="lineno"> 1747</span>  <span class="comment">/* NOP option. */</span></div>
<div class="line"><a name="l01748"></a><span class="lineno"> 1748</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_parseopt: NOP\n"</span>));</div>
<div class="line"><a name="l01749"></a><span class="lineno"> 1749</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l01750"></a><span class="lineno"> 1750</span>  <span class="keywordflow">case</span> LWIP_TCP_OPT_MSS:</div>
<div class="line"><a name="l01751"></a><span class="lineno"> 1751</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_parseopt: MSS\n"</span>));</div>
<div class="line"><a name="l01752"></a><span class="lineno"> 1752</span>  <span class="keywordflow">if</span> (tcp_getoptbyte() != LWIP_TCP_OPT_LEN_MSS || (tcp_optidx - 2 + LWIP_TCP_OPT_LEN_MSS) > tcphdr_optlen) {</div>
<div class="line"><a name="l01753"></a><span class="lineno"> 1753</span>  <span class="comment">/* Bad length */</span></div>
<div class="line"><a name="l01754"></a><span class="lineno"> 1754</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_parseopt: bad length\n"</span>));</div>
<div class="line"><a name="l01755"></a><span class="lineno"> 1755</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l01756"></a><span class="lineno"> 1756</span>  }</div>
<div class="line"><a name="l01757"></a><span class="lineno"> 1757</span>  <span class="comment">/* An MSS option with the right option length. */</span></div>
<div class="line"><a name="l01758"></a><span class="lineno"> 1758</span>  mss = (tcp_getoptbyte() << 8);</div>
<div class="line"><a name="l01759"></a><span class="lineno"> 1759</span>  mss |= tcp_getoptbyte();</div>
<div class="line"><a name="l01760"></a><span class="lineno"> 1760</span>  <span class="comment">/* Limit the mss to the configured TCP_MSS and prevent division by zero */</span></div>
<div class="line"><a name="l01761"></a><span class="lineno"> 1761</span>  pcb->mss = ((mss > <a class="code" href="../../d2/d78/lwipopts_8h.html#af1ab7bb27860aa3677c387a2f3ba317b">TCP_MSS</a>) || (mss == 0)) ? <a class="code" href="../../d2/d78/lwipopts_8h.html#af1ab7bb27860aa3677c387a2f3ba317b">TCP_MSS</a> : mss;</div>
<div class="line"><a name="l01762"></a><span class="lineno"> 1762</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l01763"></a><span class="lineno"> 1763</span> <span class="preprocessor">#if LWIP_WND_SCALE</span></div>
<div class="line"><a name="l01764"></a><span class="lineno"> 1764</span>  <span class="keywordflow">case</span> LWIP_TCP_OPT_WS:</div>
<div class="line"><a name="l01765"></a><span class="lineno"> 1765</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_parseopt: WND_SCALE\n"</span>));</div>
<div class="line"><a name="l01766"></a><span class="lineno"> 1766</span>  <span class="keywordflow">if</span> (tcp_getoptbyte() != LWIP_TCP_OPT_LEN_WS || (tcp_optidx - 2 + LWIP_TCP_OPT_LEN_WS) > tcphdr_optlen) {</div>
<div class="line"><a name="l01767"></a><span class="lineno"> 1767</span>  <span class="comment">/* Bad length */</span></div>
<div class="line"><a name="l01768"></a><span class="lineno"> 1768</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_parseopt: bad length\n"</span>));</div>
<div class="line"><a name="l01769"></a><span class="lineno"> 1769</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l01770"></a><span class="lineno"> 1770</span>  }</div>
<div class="line"><a name="l01771"></a><span class="lineno"> 1771</span>  <span class="comment">/* An WND_SCALE option with the right option length. */</span></div>
<div class="line"><a name="l01772"></a><span class="lineno"> 1772</span>  data = tcp_getoptbyte();</div>
<div class="line"><a name="l01773"></a><span class="lineno"> 1773</span>  <span class="comment">/* If syn was received with wnd scale option,</span></div>
<div class="line"><a name="l01774"></a><span class="lineno"> 1774</span> <span class="comment"> activate wnd scale opt, but only if this is not a retransmission */</span></div>
<div class="line"><a name="l01775"></a><span class="lineno"> 1775</span>  <span class="keywordflow">if</span> ((<a class="code" href="../../d9/db8/structpbuf.html#aa4d1af2cab3d9280d29212095b5b872a">flags</a> & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a>) && !(pcb->flags & TF_WND_SCALE)) {</div>
<div class="line"><a name="l01776"></a><span class="lineno"> 1776</span>  pcb->snd_scale = data;</div>
<div class="line"><a name="l01777"></a><span class="lineno"> 1777</span>  <span class="keywordflow">if</span> (pcb->snd_scale > 14U) {</div>
<div class="line"><a name="l01778"></a><span class="lineno"> 1778</span>  pcb->snd_scale = 14U;</div>
<div class="line"><a name="l01779"></a><span class="lineno"> 1779</span>  }</div>
<div class="line"><a name="l01780"></a><span class="lineno"> 1780</span>  pcb->rcv_scale = <a class="code" href="../../dd/da6/group__lwip__opts__tcp.html#ga768765a2c678fefeca6c89aae0cf629f">TCP_RCV_SCALE</a>;</div>
<div class="line"><a name="l01781"></a><span class="lineno"> 1781</span>  pcb->flags |= TF_WND_SCALE;</div>
<div class="line"><a name="l01782"></a><span class="lineno"> 1782</span>  <span class="comment">/* window scaling is enabled, we can use the full receive window */</span></div>
<div class="line"><a name="l01783"></a><span class="lineno"> 1783</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"window not at default value"</span>, pcb->rcv_wnd == TCPWND_MIN16(<a class="code" href="../../d2/d78/lwipopts_8h.html#a7f535a6efb5cdf86c3210e35ece1d6a7">TCP_WND</a>));</div>
<div class="line"><a name="l01784"></a><span class="lineno"> 1784</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"window not at default value"</span>, pcb->rcv_ann_wnd == TCPWND_MIN16(<a class="code" href="../../d2/d78/lwipopts_8h.html#a7f535a6efb5cdf86c3210e35ece1d6a7">TCP_WND</a>));</div>
<div class="line"><a name="l01785"></a><span class="lineno"> 1785</span>  pcb->rcv_wnd = pcb->rcv_ann_wnd = <a class="code" href="../../d2/d78/lwipopts_8h.html#a7f535a6efb5cdf86c3210e35ece1d6a7">TCP_WND</a>;</div>
<div class="line"><a name="l01786"></a><span class="lineno"> 1786</span>  }</div>
<div class="line"><a name="l01787"></a><span class="lineno"> 1787</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l01788"></a><span class="lineno"> 1788</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l01789"></a><span class="lineno"> 1789</span> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS</span></div>
<div class="line"><a name="l01790"></a><span class="lineno"> 1790</span>  <span class="keywordflow">case</span> LWIP_TCP_OPT_TS:</div>
<div class="line"><a name="l01791"></a><span class="lineno"> 1791</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_parseopt: TS\n"</span>));</div>
<div class="line"><a name="l01792"></a><span class="lineno"> 1792</span>  <span class="keywordflow">if</span> (tcp_getoptbyte() != LWIP_TCP_OPT_LEN_TS || (tcp_optidx - 2 + LWIP_TCP_OPT_LEN_TS) > tcphdr_optlen) {</div>
<div class="line"><a name="l01793"></a><span class="lineno"> 1793</span>  <span class="comment">/* Bad length */</span></div>
<div class="line"><a name="l01794"></a><span class="lineno"> 1794</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_parseopt: bad length\n"</span>));</div>
<div class="line"><a name="l01795"></a><span class="lineno"> 1795</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l01796"></a><span class="lineno"> 1796</span>  }</div>
<div class="line"><a name="l01797"></a><span class="lineno"> 1797</span>  <span class="comment">/* TCP timestamp option with valid length */</span></div>
<div class="line"><a name="l01798"></a><span class="lineno"> 1798</span>  tsval = tcp_getoptbyte();</div>
<div class="line"><a name="l01799"></a><span class="lineno"> 1799</span>  tsval |= (tcp_getoptbyte() << 8);</div>
<div class="line"><a name="l01800"></a><span class="lineno"> 1800</span>  tsval |= (tcp_getoptbyte() << 16);</div>
<div class="line"><a name="l01801"></a><span class="lineno"> 1801</span>  tsval |= (tcp_getoptbyte() << 24);</div>
<div class="line"><a name="l01802"></a><span class="lineno"> 1802</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d9/db8/structpbuf.html#aa4d1af2cab3d9280d29212095b5b872a">flags</a> & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a>) {</div>
<div class="line"><a name="l01803"></a><span class="lineno"> 1803</span>  pcb->ts_recent = <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(tsval);</div>
<div class="line"><a name="l01804"></a><span class="lineno"> 1804</span>  <span class="comment">/* Enable sending timestamps in every segment now that we know</span></div>
<div class="line"><a name="l01805"></a><span class="lineno"> 1805</span> <span class="comment"> the remote host supports it. */</span></div>
<div class="line"><a name="l01806"></a><span class="lineno"> 1806</span>  pcb->flags |= TF_TIMESTAMP;</div>
<div class="line"><a name="l01807"></a><span class="lineno"> 1807</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (TCP_SEQ_BETWEEN(pcb->ts_lastacksent, seqno, seqno+tcplen)) {</div>
<div class="line"><a name="l01808"></a><span class="lineno"> 1808</span>  pcb->ts_recent = <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(tsval);</div>
<div class="line"><a name="l01809"></a><span class="lineno"> 1809</span>  }</div>
<div class="line"><a name="l01810"></a><span class="lineno"> 1810</span>  <span class="comment">/* Advance to next option (6 bytes already read) */</span></div>
<div class="line"><a name="l01811"></a><span class="lineno"> 1811</span>  tcp_optidx += LWIP_TCP_OPT_LEN_TS - 6;</div>
<div class="line"><a name="l01812"></a><span class="lineno"> 1812</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l01813"></a><span class="lineno"> 1813</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l01814"></a><span class="lineno"> 1814</span>  <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l01815"></a><span class="lineno"> 1815</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_parseopt: other\n"</span>));</div>
<div class="line"><a name="l01816"></a><span class="lineno"> 1816</span>  data = tcp_getoptbyte();</div>
<div class="line"><a name="l01817"></a><span class="lineno"> 1817</span>  <span class="keywordflow">if</span> (data < 2) {</div>
<div class="line"><a name="l01818"></a><span class="lineno"> 1818</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a>, (<span class="stringliteral">"tcp_parseopt: bad length\n"</span>));</div>
<div class="line"><a name="l01819"></a><span class="lineno"> 1819</span>  <span class="comment">/* If the length field is zero, the options are malformed</span></div>
<div class="line"><a name="l01820"></a><span class="lineno"> 1820</span> <span class="comment"> and we don't process them further. */</span></div>
<div class="line"><a name="l01821"></a><span class="lineno"> 1821</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l01822"></a><span class="lineno"> 1822</span>  }</div>
<div class="line"><a name="l01823"></a><span class="lineno"> 1823</span>  <span class="comment">/* All other options have a length field, so that we easily</span></div>
<div class="line"><a name="l01824"></a><span class="lineno"> 1824</span> <span class="comment"> can skip past them. */</span></div>
<div class="line"><a name="l01825"></a><span class="lineno"> 1825</span>  tcp_optidx += data - 2;</div>
<div class="line"><a name="l01826"></a><span class="lineno"> 1826</span>  }</div>
<div class="line"><a name="l01827"></a><span class="lineno"> 1827</span>  }</div>
<div class="line"><a name="l01828"></a><span class="lineno"> 1828</span>  }</div>
<div class="line"><a name="l01829"></a><span class="lineno"> 1829</span> }</div>
<div class="line"><a name="l01830"></a><span class="lineno"> 1830</span>  </div>
<div class="line"><a name="l01831"></a><span class="lineno"> 1831</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l01832"></a><span class="lineno"> 1832</span> tcp_trigger_input_pcb_close(<span class="keywordtype">void</span>)</div>
<div class="line"><a name="l01833"></a><span class="lineno"> 1833</span> {</div>
<div class="line"><a name="l01834"></a><span class="lineno"> 1834</span>  recv_flags |= TF_CLOSED;</div>
<div class="line"><a name="l01835"></a><span class="lineno"> 1835</span> }</div>
<div class="line"><a name="l01836"></a><span class="lineno"> 1836</span>  </div>
<div class="line"><a name="l01837"></a><span class="lineno"> 1837</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_TCP */</span><span class="preprocessor"></span></div>
</div><!-- fragment --></div><!-- contents -->
</div><!-- doc-content -->
<div class="ttc" id="aprot_2tcp_8h_html_a6020613f5062417d9811cfa837215c83"><div class="ttname"><a href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a></div><div class="ttdeci">#define TCP_SYN</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d67/prot_2tcp_8h_source.html#l00073">tcp.h:73</a></div></div>
<div class="ttc" id="aprot_2tcp_8h_html_a44b3b1ab31a403ba28ec135adfcbefef"><div class="ttname"><a href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a></div><div class="ttdeci">#define TCP_ACK</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d67/prot_2tcp_8h_source.html#l00076">tcp.h:76</a></div></div>
<div class="ttc" id="adef_8h_html_ac642bf6057869696d7807564d8309ffc"><div class="ttname"><a href="../../d4/da4/def_8h.html#ac642bf6057869696d7807564d8309ffc">lwip_ntohs</a></div><div class="ttdeci">#define lwip_ntohs(x)</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/da4/def_8h_source.html#l00076">def.h:76</a></div></div>
<div class="ttc" id="aopt_8h_html"><div class="ttname"><a href="../../dc/dba/opt_8h.html">opt.h</a></div></div>
<div class="ttc" id="aip__addr_8h_html_a008c9c92d770cc030ea054e6b259835a"><div class="ttname"><a href="../../de/df7/ip__addr_8h.html#a008c9c92d770cc030ea054e6b259835a">ip_addr_cmp</a></div><div class="ttdeci">#define ip_addr_cmp(addr1, addr2)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/df7/ip__addr_8h_source.html#l00316">ip_addr.h:316</a></div></div>
<div class="ttc" id="astructpbuf_html_a6f82449625e36e294f5d210268c0703f"><div class="ttname"><a href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">pbuf::len</a></div><div class="ttdeci">u16_t len</div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00159">pbuf.h:159</a></div></div>
<div class="ttc" id="agroup__compiler__abstraction_html_gacf46f4df0ebab84edebcb69967fdf86b"><div class="ttname"><a href="../../de/d8c/group__compiler__abstraction.html#gacf46f4df0ebab84edebcb69967fdf86b">s16_t</a></div><div class="ttdeci">int16_t s16_t</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d2d/arch_8h_source.html#l00125">arch.h:125</a></div></div>
<div class="ttc" id="adef_8h_html"><div class="ttname"><a href="../../d4/da4/def_8h.html">def.h</a></div></div>
<div class="ttc" id="aperf_8h_html_a8ac3afe5d720793a229fbf70a78eb82f"><div class="ttname"><a href="../../d1/d3b/perf_8h.html#a8ac3afe5d720793a229fbf70a78eb82f">PERF_STOP</a></div><div class="ttdeci">#define PERF_STOP(x)</div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d3b/perf_8h_source.html#l00021">perf.h:21</a></div></div>
<div class="ttc" id="and6_8h_html"><div class="ttname"><a href="../../d9/d56/nd6_8h.html">nd6.h</a></div></div>
<div class="ttc" id="adebug_8h_html_a94ad086267808462beae2b38f91996ed"><div class="ttname"><a href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a></div><div class="ttdeci">#define LWIP_ASSERT(message, assertion)</div><div class="ttdef"><b>Definition:</b> <a href="../../db/d16/debug_8h_source.html#l00116">debug.h:116</a></div></div>
<div class="ttc" id="aprot_2tcp_8h_html_afe7c917080459557c65071c4b13c8e12"><div class="ttname"><a href="../../d9/d67/prot_2tcp_8h.html#afe7c917080459557c65071c4b13c8e12">TCPH_FLAGS_SET</a></div><div class="ttdeci">#define TCPH_FLAGS_SET(phdr, flags)</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d67/prot_2tcp_8h_source.html#l00087">tcp.h:87</a></div></div>
<div class="ttc" id="agroup__infrastructure__errors_html_ggae2e66c7d13afc90ffecd6151680fbadcaf316b2c5eee4079820f7100849115142"><div class="ttname"><a href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaf316b2c5eee4079820f7100849115142">ERR_ABRT</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d40/err_8h_source.html#l00090">err.h:90</a></div></div>
<div class="ttc" id="aip_8h_html_a9135977868017c3deeec86b525e13997"><div class="ttname"><a href="../../da/d2f/ip_8h.html#a9135977868017c3deeec86b525e13997">ip_current_dest_addr</a></div><div class="ttdeci">#define ip_current_dest_addr()</div><div class="ttdef"><b>Definition:</b> <a href="../../da/d2f/ip_8h_source.html#l00212">ip.h:212</a></div></div>
<div class="ttc" id="agroup__compiler__abstraction_html_ga77570ac4fcab86864fa1916e55676da2"><div class="ttname"><a href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a></div><div class="ttdeci">uint16_t u16_t</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d2d/arch_8h_source.html#l00124">arch.h:124</a></div></div>
<div class="ttc" id="aperf_8h_html_aa1d6977095e51331f65dcfb2b076da52"><div class="ttname"><a href="../../d1/d3b/perf_8h.html#aa1d6977095e51331f65dcfb2b076da52">PERF_START</a></div><div class="ttdeci">#define PERF_START</div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d3b/perf_8h_source.html#l00020">perf.h:20</a></div></div>
<div class="ttc" id="alwipopts_8h_html_a66df03d8192cd978d3321a9d68bf5411"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#a66df03d8192cd978d3321a9d68bf5411">TCP_CWND_DEBUG</a></div><div class="ttdeci">#define TCP_CWND_DEBUG</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00471">lwipopts.h:471</a></div></div>
<div class="ttc" id="aip__addr_8h_html_a2170d3ee13dd22722222228e7b1c5752"><div class="ttname"><a href="../../de/df7/ip__addr_8h.html#a2170d3ee13dd22722222228e7b1c5752">ip_addr_ismulticast</a></div><div class="ttdeci">#define ip_addr_ismulticast(ipaddr)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/df7/ip__addr_8h_source.html#l00322">ip_addr.h:322</a></div></div>
<div class="ttc" id="aip__addr_8h_html_a83b17dbf7d1faf5c8f8c20b039db8bb8"><div class="ttname"><a href="../../de/df7/ip__addr_8h.html#a83b17dbf7d1faf5c8f8c20b039db8bb8">IP_IS_ANY_TYPE_VAL</a></div><div class="ttdeci">#define IP_IS_ANY_TYPE_VAL(ipaddr)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/df7/ip__addr_8h_source.html#l00297">ip_addr.h:297</a></div></div>
<div class="ttc" id="aip__addr_8h_html_a279118890e6a90aa740051fb8b0cc5f4"><div class="ttname"><a href="../../de/df7/ip__addr_8h.html#a279118890e6a90aa740051fb8b0cc5f4">ip_addr_isany</a></div><div class="ttdeci">#define ip_addr_isany(ipaddr)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/df7/ip__addr_8h_source.html#l00317">ip_addr.h:317</a></div></div>
<div class="ttc" id="astructpbuf_html_a5259e7ec29bab9c0999b64f2e86b411f"><div class="ttname"><a href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">pbuf::tot_len</a></div><div class="ttdeci">u16_t tot_len</div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00156">pbuf.h:156</a></div></div>
<div class="ttc" id="aip_8h_html_ae4bbdf8a2e757d758ec0e1c91b58893f"><div class="ttname"><a href="../../da/d2f/ip_8h.html#ae4bbdf8a2e757d758ec0e1c91b58893f">SOF_INHERITED</a></div><div class="ttdeci">#define SOF_INHERITED</div><div class="ttdef"><b>Definition:</b> <a href="../../da/d2f/ip_8h_source.html#l00102">ip.h:102</a></div></div>
<div class="ttc" id="agroup__compiler__abstraction_html_ga4c14294869aceba3ef9d4c0c302d0f33"><div class="ttname"><a href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a></div><div class="ttdeci">uint32_t u32_t</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d2d/arch_8h_source.html#l00126">arch.h:126</a></div></div>
<div class="ttc" id="apbuf_8h_html_a5df7ac5ae59012fe9aeddba375a72190"><div class="ttname"><a href="../../d0/d35/pbuf_8h.html#a5df7ac5ae59012fe9aeddba375a72190">pbuf_clen</a></div><div class="ttdeci">u16_t pbuf_clen(const struct pbuf *p)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/df0/pbuf_8c_source.html#l00801">pbuf.c:801</a></div></div>
<div class="ttc" id="astructpbuf_html_a5e5763c94fd18d78937b0b58ce7df341"><div class="ttname"><a href="../../d9/db8/structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">pbuf::next</a></div><div class="ttdeci">struct pbuf * next</div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00144">pbuf.h:144</a></div></div>
<div class="ttc" id="agroup__pbuf_html_gab0dd696fb4b6bc65e548944584f1738b"><div class="ttname"><a href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a></div><div class="ttdeci">u8_t pbuf_free(struct pbuf *p)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/df0/pbuf_8c_source.html#l00715">pbuf.c:715</a></div></div>
<div class="ttc" id="aip__addr_8h_html_a11275b39f9b8e876e8124a16410e8840"><div class="ttname"><a href="../../de/df7/ip__addr_8h.html#a11275b39f9b8e876e8124a16410e8840">ip_addr_isbroadcast</a></div><div class="ttdeci">#define ip_addr_isbroadcast(addr, netif)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/df7/ip__addr_8h_source.html#l00321">ip_addr.h:321</a></div></div>
<div class="ttc" id="alwipopts_8h_html_ae7980c7f8eb45cd411bf410ff0a3fc55"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#ae7980c7f8eb45cd411bf410ff0a3fc55">TCP_QLEN_DEBUG</a></div><div class="ttdeci">#define TCP_QLEN_DEBUG</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00479">lwipopts.h:479</a></div></div>
<div class="ttc" id="aip__addr_8h_html_a81ed1fbe375d867d6e77c83976c07671"><div class="ttname"><a href="../../de/df7/ip__addr_8h.html#a81ed1fbe375d867d6e77c83976c07671">IP_ADDR_PCB_VERSION_MATCH_EXACT</a></div><div class="ttdeci">#define IP_ADDR_PCB_VERSION_MATCH_EXACT(pcb, ipaddr)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/df7/ip__addr_8h_source.html#l00240">ip_addr.h:240</a></div></div>
<div class="ttc" id="ainet__chksum_8h_html_aa13cda42e7c262f5dee243ff6c28422f"><div class="ttname"><a href="../../d2/d45/inet__chksum_8h.html#aa13cda42e7c262f5dee243ff6c28422f">ip_chksum_pseudo</a></div><div class="ttdeci">u16_t ip_chksum_pseudo(struct pbuf *p, u8_t proto, u16_t proto_len, const ip_addr_t *src, const ip_addr_t *dest)</div><div class="ttdef"><b>Definition:</b> <a href="../../da/d81/inet__chksum_8c_source.html#l00379">inet_chksum.c:379</a></div></div>
<div class="ttc" id="apbuf_8h_html_a36a915aa2f6a188baa2862881407971e"><div class="ttname"><a href="../../d0/d35/pbuf_8h.html#a36a915aa2f6a188baa2862881407971e">PBUF_FLAG_TCP_FIN</a></div><div class="ttdeci">#define PBUF_FLAG_TCP_FIN</div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00139">pbuf.h:139</a></div></div>
<div class="ttc" id="adef_8h_html_a748f5df614a3fc989e8900fd229d6e4e"><div class="ttname"><a href="../../d4/da4/def_8h.html#a748f5df614a3fc989e8900fd229d6e4e">LWIP_MIN</a></div><div class="ttdeci">#define LWIP_MIN(x, y)</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/da4/def_8h_source.html#l00055">def.h:55</a></div></div>
<div class="ttc" id="agroup__compiler__abstraction_html_ga1418f92673e54a36b6e376109e526382"><div class="ttname"><a href="../../de/d8c/group__compiler__abstraction.html#ga1418f92673e54a36b6e376109e526382">X16_F</a></div><div class="ttdeci">#define X16_F</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d2d/arch_8h_source.html#l00154">arch.h:154</a></div></div>
<div class="ttc" id="amemp_8h_html_aecd94926b7c2a0e23ae195f4ae97581f"><div class="ttname"><a href="../../df/dff/memp_8h.html#aecd94926b7c2a0e23ae195f4ae97581f">memp_free</a></div><div class="ttdeci">void memp_free(memp_t type, void *mem)</div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d70/memp_8c_source.html#l00469">memp.c:469</a></div></div>
<div class="ttc" id="anetif_8h_html_ad968df1b35c2fae368e087966e3bc677"><div class="ttname"><a href="../../d9/d69/netif_8h.html#ad968df1b35c2fae368e087966e3bc677">IF__NETIF_CHECKSUM_ENABLED</a></div><div class="ttdeci">#define IF__NETIF_CHECKSUM_ENABLED(netif, chksumflag)</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d69/netif_8h_source.html#l00357">netif.h:357</a></div></div>
<div class="ttc" id="alwipopts_8h_html_a1f57d3859c4556f785708e5dc440617e"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#a1f57d3859c4556f785708e5dc440617e">TCP_OOSEQ_MAX_PBUFS</a></div><div class="ttdeci">#define TCP_OOSEQ_MAX_PBUFS</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00194">lwipopts.h:194</a></div></div>
<div class="ttc" id="astructpbuf_html_aa4d1af2cab3d9280d29212095b5b872a"><div class="ttname"><a href="../../d9/db8/structpbuf.html#aa4d1af2cab3d9280d29212095b5b872a">pbuf::flags</a></div><div class="ttdeci">u8_t flags</div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00165">pbuf.h:165</a></div></div>
<div class="ttc" id="alwipopts_8h_html_a37596f7bbb9b7663826244ba54486679"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#a37596f7bbb9b7663826244ba54486679">TCP_RST_DEBUG</a></div><div class="ttdeci">#define TCP_RST_DEBUG</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00477">lwipopts.h:477</a></div></div>
<div class="ttc" id="astats_8h_html"><div class="ttname"><a href="../../d9/d9b/stats_8h.html">stats.h</a></div></div>
<div class="ttc" id="agroup__infrastructure__errors_html_ggae2e66c7d13afc90ffecd6151680fbadcaaaeafdbf3aecc46864daa3cd829c7e05"><div class="ttname"><a href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaaaeafdbf3aecc46864daa3cd829c7e05">ERR_MEM</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d40/err_8h_source.html#l00065">err.h:65</a></div></div>
<div class="ttc" id="alwipopts_8h_html_a3704f433e947d6342da77c74e33627e1"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#a3704f433e947d6342da77c74e33627e1">TCP_WND_DEBUG</a></div><div class="ttdeci">#define TCP_WND_DEBUG</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00473">lwipopts.h:473</a></div></div>
<div class="ttc" id="anetif_8h_html"><div class="ttname"><a href="../../d9/d69/netif_8h.html">netif.h</a></div></div>
<div class="ttc" id="agroup__infrastructure__errors_html_ggae2e66c7d13afc90ffecd6151680fbadcaa5176d9fecf8ec43d3bc49f4e6c3f7f5"><div class="ttname"><a href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa5176d9fecf8ec43d3bc49f4e6c3f7f5">ERR_CLSD</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d40/err_8h_source.html#l00094">err.h:94</a></div></div>
<div class="ttc" id="aprot_2ip_8h_html_a634284ee3a136d6ad61bc5d917ebb82f"><div class="ttname"><a href="../../d4/d19/prot_2ip_8h.html#a634284ee3a136d6ad61bc5d917ebb82f">IP_PROTO_TCP</a></div><div class="ttdeci">#define IP_PROTO_TCP</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/d19/prot_2ip_8h_source.html#l00046">ip.h:46</a></div></div>
<div class="ttc" id="aip_8h_html_aabecef3c7653a9767c79245c44fcab9f"><div class="ttname"><a href="../../da/d2f/ip_8h.html#aabecef3c7653a9767c79245c44fcab9f">ip_current_netif</a></div><div class="ttdeci">#define ip_current_netif()</div><div class="ttdef"><b>Definition:</b> <a href="../../da/d2f/ip_8h_source.html#l00133">ip.h:133</a></div></div>
<div class="ttc" id="adef_8h_html_a56098407d66feb75806f655bafbee81d"><div class="ttname"><a href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a></div><div class="ttdeci">#define lwip_ntohl(x)</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/da4/def_8h_source.html#l00078">def.h:78</a></div></div>
<div class="ttc" id="alwipopts_8h_html_af1ab7bb27860aa3677c387a2f3ba317b"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#af1ab7bb27860aa3677c387a2f3ba317b">TCP_MSS</a></div><div class="ttdeci">#define TCP_MSS</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00180">lwipopts.h:180</a></div></div>
<div class="ttc" id="agroup__compiler__abstraction_html_ga10f9a3d7baef58ccc23228c3bd29c1fb"><div class="ttname"><a href="../../de/d8c/group__compiler__abstraction.html#ga10f9a3d7baef58ccc23228c3bd29c1fb">s32_t</a></div><div class="ttdeci">int32_t s32_t</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d2d/arch_8h_source.html#l00127">arch.h:127</a></div></div>
<div class="ttc" id="aprot_2tcp_8h_html_a42432f2dde6716ecb0087ccbc47cc75b"><div class="ttname"><a href="../../d9/d67/prot_2tcp_8h.html#a42432f2dde6716ecb0087ccbc47cc75b">TCPH_SET_FLAG</a></div><div class="ttdeci">#define TCPH_SET_FLAG(phdr, flags)</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d67/prot_2tcp_8h_source.html#l00090">tcp.h:90</a></div></div>
<div class="ttc" id="agroup__compiler__abstraction_html_ga4caecabca98b43919dd11be1c0d4cd8e"><div class="ttname"><a href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a></div><div class="ttdeci">uint8_t u8_t</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d2d/arch_8h_source.html#l00122">arch.h:122</a></div></div>
<div class="ttc" id="aprot_2tcp_8h_html_a5ca559def464ef20d8b1f7d32f2f160d"><div class="ttname"><a href="../../d9/d67/prot_2tcp_8h.html#a5ca559def464ef20d8b1f7d32f2f160d">TCP_RST</a></div><div class="ttdeci">#define TCP_RST</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d67/prot_2tcp_8h_source.html#l00074">tcp.h:74</a></div></div>
<div class="ttc" id="alwipopts_8h_html_a4f43bb8a430c7a52a1ad5086d3f2803c"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#a4f43bb8a430c7a52a1ad5086d3f2803c">TCP_DEBUG</a></div><div class="ttdeci">#define TCP_DEBUG</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00463">lwipopts.h:463</a></div></div>
<div class="ttc" id="atcp__priv_8h_html"><div class="ttname"><a href="../../da/d54/tcp__priv_8h.html">tcp_priv.h</a></div></div>
<div class="ttc" id="apbuf_8h_html_a018a6499e357f8a1373321f802a82930"><div class="ttname"><a href="../../d0/d35/pbuf_8h.html#a018a6499e357f8a1373321f802a82930">PBUF_FLAG_PUSH</a></div><div class="ttdeci">#define PBUF_FLAG_PUSH</div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00128">pbuf.h:128</a></div></div>
<div class="ttc" id="aip_8h_html_a4e35b7692c228c98e738892f0a215647"><div class="ttname"><a href="../../da/d2f/ip_8h.html#a4e35b7692c228c98e738892f0a215647">ip_current_src_addr</a></div><div class="ttdeci">#define ip_current_src_addr()</div><div class="ttdef"><b>Definition:</b> <a href="../../da/d2f/ip_8h_source.html#l00210">ip.h:210</a></div></div>
<div class="ttc" id="astructnetif_html"><div class="ttname"><a href="../../d2/dd6/structnetif.html">netif</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d69/netif_8h_source.html#l00233">netif.h:233</a></div></div>
<div class="ttc" id="agroup__pbuf_html_ga50abfe830a33a1a47a562febee66015d"><div class="ttname"><a href="../../d7/d05/group__pbuf.html#ga50abfe830a33a1a47a562febee66015d">pbuf_realloc</a></div><div class="ttdeci">void pbuf_realloc(struct pbuf *p, u16_t size)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/df0/pbuf_8c_source.html#l00493">pbuf.c:493</a></div></div>
<div class="ttc" id="astats_8h_html_a237a8f1e47af42fb612e936e928a9ced"><div class="ttname"><a href="../../d9/d9b/stats_8h.html#a237a8f1e47af42fb612e936e928a9ced">MIB2_STATS_INC</a></div><div class="ttdeci">#define MIB2_STATS_INC(x)</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d9b/stats_8h_source.html#l00467">stats.h:467</a></div></div>
<div class="ttc" id="agroup__compiler__abstraction_html_ga70624a5deb8b9199406372a7f3603ecf"><div class="ttname"><a href="../../de/d8c/group__compiler__abstraction.html#ga70624a5deb8b9199406372a7f3603ecf">LWIP_UNUSED_ARG</a></div><div class="ttdeci">#define LWIP_UNUSED_ARG(x)</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d2d/arch_8h_source.html#l00315">arch.h:315</a></div></div>
<div class="ttc" id="aprot_2tcp_8h_html_a88e60aa2cf23e1c65d630701db08c743"><div class="ttname"><a href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a></div><div class="ttdeci">#define TCP_FIN</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d67/prot_2tcp_8h_source.html#l00072">tcp.h:72</a></div></div>
<div class="ttc" id="agroup__pbuf_html_ga82429084fe29015509c9b4a072707cd4"><div class="ttname"><a href="../../d7/d05/group__pbuf.html#ga82429084fe29015509c9b4a072707cd4">pbuf_cat</a></div><div class="ttdeci">void pbuf_cat(struct pbuf *head, struct pbuf *tail)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/df0/pbuf_8c_source.html#l00841">pbuf.c:841</a></div></div>
<div class="ttc" id="astats_8h_html_a33fdaa705af04fb9a82f1cf0ba21091d"><div class="ttname"><a href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a></div><div class="ttdeci">#define TCP_STATS_INC(x)</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d9b/stats_8h_source.html#l00328">stats.h:328</a></div></div>
<div class="ttc" id="agroup__compiler__abstraction_html_gaa9d7f6eb2ee9fcc5eda3545dbb1886e0"><div class="ttname"><a href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a></div><div class="ttdeci">#define U16_F</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d2d/arch_8h_source.html#l00148">arch.h:148</a></div></div>
<div class="ttc" id="alwipopts_8h_html_a7f535a6efb5cdf86c3210e35ece1d6a7"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#a7f535a6efb5cdf86c3210e35ece1d6a7">TCP_WND</a></div><div class="ttdeci">#define TCP_WND</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00172">lwipopts.h:172</a></div></div>
<div class="ttc" id="agroup__infrastructure__errors_html_ggae2e66c7d13afc90ffecd6151680fbadcaa26c163b80b1f6786ca81dadc14b00fb"><div class="ttname"><a href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa26c163b80b1f6786ca81dadc14b00fb">ERR_OK</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d40/err_8h_source.html#l00063">err.h:63</a></div></div>
<div class="ttc" id="agroup__infrastructure__errors_html_gaf02d9da80fd66b4f986d2c53d7231ddb"><div class="ttname"><a href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a></div><div class="ttdeci">s8_t err_t</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d40/err_8h_source.html#l00057">err.h:57</a></div></div>
<div class="ttc" id="aip__addr_8h_html_a77a933975db287f6aa5c2e70249ba18f"><div class="ttname"><a href="../../de/df7/ip__addr_8h.html#a77a933975db287f6aa5c2e70249ba18f">ip_addr_copy</a></div><div class="ttdeci">#define ip_addr_copy(dest, src)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/df7/ip__addr_8h_source.html#l00305">ip_addr.h:305</a></div></div>
<div class="ttc" id="agroup__infrastructure__errors_html_ggae2e66c7d13afc90ffecd6151680fbadca759030525f1768a23dc086a5fd45b4e5"><div class="ttname"><a href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadca759030525f1768a23dc086a5fd45b4e5">ERR_RST</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d40/err_8h_source.html#l00092">err.h:92</a></div></div>
<div class="ttc" id="aip6__addr_8h_html"><div class="ttname"><a href="../../d3/d7d/ip6__addr_8h.html">ip6_addr.h</a></div></div>
<div class="ttc" id="alwipopts_8h_html_af51dc2563536de56470146749f715ba8"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#af51dc2563536de56470146749f715ba8">TCP_INPUT_DEBUG</a></div><div class="ttdeci">#define TCP_INPUT_DEBUG</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00465">lwipopts.h:465</a></div></div>
<div class="ttc" id="agroup__lwip__opts__tcp_html_ga768765a2c678fefeca6c89aae0cf629f"><div class="ttname"><a href="../../dd/da6/group__lwip__opts__tcp.html#ga768765a2c678fefeca6c89aae0cf629f">TCP_RCV_SCALE</a></div><div class="ttdeci">#define TCP_RCV_SCALE</div><div class="ttdef"><b>Definition:</b> <a href="../../dc/dba/opt_8h_source.html#l01289">opt.h:1289</a></div></div>
<div class="ttc" id="aprot_2tcp_8h_html_a1320fd0006a2f70138bc2d0018dda829"><div class="ttname"><a href="../../d9/d67/prot_2tcp_8h.html#a1320fd0006a2f70138bc2d0018dda829">TCP_PSH</a></div><div class="ttdeci">#define TCP_PSH</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d67/prot_2tcp_8h_source.html#l00075">tcp.h:75</a></div></div>
<div class="ttc" id="aprot_2tcp_8h_html_a5758db371d6daa394d178429b7c94c2a"><div class="ttname"><a href="../../d9/d67/prot_2tcp_8h.html#a5758db371d6daa394d178429b7c94c2a">TCP_HLEN</a></div><div class="ttdeci">#define TCP_HLEN</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d67/prot_2tcp_8h_source.html#l00047">tcp.h:47</a></div></div>
<div class="ttc" id="aprot_2tcp_8h_html_a5b97d3b7e68c20eb3eab87a61d779223"><div class="ttname"><a href="../../d9/d67/prot_2tcp_8h.html#a5b97d3b7e68c20eb3eab87a61d779223">TCPH_HDRLEN</a></div><div class="ttdeci">#define TCPH_HDRLEN(phdr)</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d67/prot_2tcp_8h_source.html#l00083">tcp.h:83</a></div></div>
<div class="ttc" id="astructtcp__hdr_html"><div class="ttname"><a href="../../db/df4/structtcp__hdr.html">tcp_hdr</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d67/prot_2tcp_8h_source.html#l00056">tcp.h:56</a></div></div>
<div class="ttc" id="agroup__compiler__abstraction_html_gad8b0a364e95b07cb0c47709fdc6037d6"><div class="ttname"><a href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a></div><div class="ttdeci">#define U32_F</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d2d/arch_8h_source.html#l00157">arch.h:157</a></div></div>
<div class="ttc" id="amemp_8h_html"><div class="ttname"><a href="../../df/dff/memp_8h.html">memp.h</a></div></div>
<div class="ttc" id="alwipopts_8h_html_a9d6d3219bb5fc0bc760a64114de13c25"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#a9d6d3219bb5fc0bc760a64114de13c25">TCP_OOSEQ_MAX_BYTES</a></div><div class="ttdeci">#define TCP_OOSEQ_MAX_BYTES</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00192">lwipopts.h:192</a></div></div>
<div class="ttc" id="alwipopts_8h_html_ad6e52e37415d0d0cbe4931a28f5a9662"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#ad6e52e37415d0d0cbe4931a28f5a9662">TCP_RTO_DEBUG</a></div><div class="ttdeci">#define TCP_RTO_DEBUG</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00469">lwipopts.h:469</a></div></div>
<div class="ttc" id="amem_8h_html"><div class="ttname"><a href="../../d9/d9a/mem_8h.html">mem.h</a></div></div>
<div class="ttc" id="agroup__infrastructure__errors_html_ggae2e66c7d13afc90ffecd6151680fbadcaa9a1c5a6fdeed0aad7fe41d538482bbd"><div class="ttname"><a href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaa9a1c5a6fdeed0aad7fe41d538482bbd">ERR_VAL</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d40/err_8h_source.html#l00075">err.h:75</a></div></div>
<div class="ttc" id="astructpbuf_html"><div class="ttname"><a href="../../d9/db8/structpbuf.html">pbuf</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00142">pbuf.h:142</a></div></div>
<div class="ttc" id="adebug_8h_html_a63a04edf7ff63c951bd8706711956cdb"><div class="ttname"><a href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a></div><div class="ttdeci">#define LWIP_DEBUGF(debug, message)</div><div class="ttdef"><b>Definition:</b> <a href="../../db/d16/debug_8h_source.html#l00164">debug.h:164</a></div></div>
<div class="ttc" id="aip6_8h_html"><div class="ttname"><a href="../../d0/dca/ip6_8h.html">ip6.h</a></div></div>
<div class="ttc" id="aprot_2tcp_8h_html_ad5de3cf876b2c7f6835f44132fe0e9d5"><div class="ttname"><a href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a></div><div class="ttdeci">#define TCPH_FLAGS(phdr)</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d67/prot_2tcp_8h_source.html#l00084">tcp.h:84</a></div></div>
<div class="ttc" id="aip__addr_8h_html"><div class="ttname"><a href="../../de/df7/ip__addr_8h.html">ip_addr.h</a></div></div>
<div class="ttc" id="alwipopts_8h_html_a50b434a8541a4813f7b27f576c05d1b6"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#a50b434a8541a4813f7b27f576c05d1b6">TCP_SYNMAXRTX</a></div><div class="ttdeci">#define TCP_SYNMAXRTX</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00176">lwipopts.h:176</a></div></div>
<div class="ttc" id="ainet__chksum_8h_html"><div class="ttname"><a href="../../d2/d45/inet__chksum_8h.html">inet_chksum.h</a></div></div>
<div class="ttc" id="apbuf_8h_html_aaa17c1951cf2d207b6adfd3947d91f00"><div class="ttname"><a href="../../d0/d35/pbuf_8h.html#aaa17c1951cf2d207b6adfd3947d91f00">pbuf_header</a></div><div class="ttdeci">u8_t pbuf_header(struct pbuf *p, s16_t header_size)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/df0/pbuf_8c_source.html#l00665">pbuf.c:665</a></div></div>
<div class="ttc" id="astructpbuf_html_a8d32dc3e964369d4eec638fc37fbc460"><div class="ttname"><a href="../../d9/db8/structpbuf.html#a8d32dc3e964369d4eec638fc37fbc460">pbuf::payload</a></div><div class="ttdeci">void * payload</div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00147">pbuf.h:147</a></div></div>
<div class="ttc" id="afat__string_8h_html_a070d2ce7b6bb7e5c05602aa8c308d0c4"><div class="ttname"><a href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a></div><div class="ttdeci">#define NULL</div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d8a/fat__string_8h_source.html#l00017">fat_string.h:17</a></div></div>
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