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<div class="title">tcp_out.c</div> </div>
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<div class="contents">
<a href="../../d4/dbd/tcp__out_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="l00009"></a><span class="lineno"> 9</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * Copyright (c) 2001-2004 Swedish Institute of Computer Science.</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * All rights reserved.</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"> * Redistribution and use in source and binary forms, with or without modification,</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * are permitted provided that the following conditions are met:</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"> * 1. Redistributions of source code must retain the above copyright notice,</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright notice,</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * this list of conditions and the following disclaimer in the documentation</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * and/or other materials provided with the distribution.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</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="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * derived from this software without specific prior written permission.</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</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="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment"> * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</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="l00033"></a><span class="lineno"> 33</span> <span class="comment"> * OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> * This file is part of the lwIP TCP/IP stack.</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment"> * Author: Adam Dunkels <adam@sics.se></span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment"> *</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>  </div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</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="l00042"></a><span class="lineno"> 42</span>  </div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</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="l00044"></a><span class="lineno"> 44</span>  </div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</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="l00046"></a><span class="lineno"> 46</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="l00047"></a><span class="lineno"> 47</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="l00048"></a><span class="lineno"> 48</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="l00049"></a><span class="lineno"> 49</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="l00050"></a><span class="lineno"> 50</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="l00051"></a><span class="lineno"> 51</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="l00052"></a><span class="lineno"> 52</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="l00053"></a><span class="lineno"> 53</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="l00054"></a><span class="lineno"> 54</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="l00055"></a><span class="lineno"> 55</span> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="preprocessor">#include "<a class="code" href="../../d9/d87/sys_8h.html">net/sys.h</a>"</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  </div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor">#include <<a class="code" href="../../da/d66/string_8h.html">string.h</a>></span></div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  </div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span> <span class="comment">/* Define some copy-macros for checksum-on-copy so that the code looks</span></div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="comment"> nicer by preventing too many ifdef's. */</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> <span class="preprocessor">#define TCP_DATA_COPY(dst, src, len, seg) do { \</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="preprocessor"> tcp_seg_add_chksum(LWIP_CHKSUM_COPY(dst, src, len), \</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="preprocessor"> len, &seg->chksum, &seg->chksum_swapped); \</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="preprocessor"> seg->flags |= TF_SEG_DATA_CHECKSUMMED; } while(0)</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="preprocessor">#define TCP_DATA_COPY2(dst, src, len, chksum, chksum_swapped) \</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="preprocessor"> tcp_seg_add_chksum(LWIP_CHKSUM_COPY(dst, src, len), len, chksum, chksum_swapped);</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="preprocessor">#else </span><span class="comment">/* TCP_CHECKSUM_ON_COPY*/</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="preprocessor">#define TCP_DATA_COPY(dst, src, len, seg) MEMCPY(dst, src, len)</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="preprocessor">#define TCP_DATA_COPY2(dst, src, len, chksum, chksum_swapped) MEMCPY(dst, src, len)</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CHECKSUM_ON_COPY*/</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  </div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="preprocessor">#ifndef TCP_CHECKSUM_ON_COPY_SANITY_CHECK</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span> <span class="preprocessor">#define TCP_CHECKSUM_ON_COPY_SANITY_CHECK 0</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">/* Allow to override the failure of sanity check from warning to e.g. hard failure */</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY_SANITY_CHECK</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span> <span class="preprocessor">#ifndef TCP_CHECKSUM_ON_COPY_SANITY_CHECK_FAIL</span></div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span> <span class="preprocessor">#define TCP_CHECKSUM_ON_COPY_SANITY_CHECK_FAIL(msg) LWIP_DEBUGF(TCP_DEBUG | LWIP_DBG_LEVEL_WARNING, msg)</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  </div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="preprocessor">#if TCP_OVERSIZE</span></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="preprocessor">#ifndef TCP_OVERSIZE_CALC_LENGTH</span></div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span> <span class="preprocessor">#define TCP_OVERSIZE_CALC_LENGTH(length) ((length) + TCP_OVERSIZE)</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  </div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="comment">/* Forward declarations.*/</span></div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="keyword">static</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> tcp_output_segment(<span class="keyword">struct</span> tcp_seg *seg, <span class="keyword">struct</span> tcp_pcb *pcb, <span class="keyword">struct</span> <a class="code" href="../../d2/dd6/structnetif.html">netif</a> *<a class="code" href="../../d2/dd6/structnetif.html">netif</a>);</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  </div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span> tcp_output_alloc_header(<span class="keyword">struct</span> tcp_pcb *pcb, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> optlen, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> datalen,</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> seqno_be <span class="comment">/* already in network byte order */</span>)</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span> {</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</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="l00112"></a><span class="lineno"> 112</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p = <a class="code" href="../../d7/d05/group__pbuf.html#gacfcb0a2af918658ba0afe36499c65f47">pbuf_alloc</a>(<a class="code" href="../../d7/d05/group__pbuf.html#ggaee1baa59bb2f85ba575b5a8619ac1ebfafcc1e506061ba69dfa142eb6b3da5f13">PBUF_IP</a>, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5758db371d6daa394d178429b7c94c2a">TCP_HLEN</a> + optlen + datalen, <a class="code" href="../../d7/d05/group__pbuf.html#ggab7e0e32fcc292c0d7107721766ed92fbac5e9f28455bca98944a030d4b84ecfab">PBUF_RAM</a>);</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">if</span> (p != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"check that first pbuf can hold struct tcp_hdr"</span>,</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</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> + optlen));</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</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="l00117"></a><span class="lineno"> 117</span>  tcphdr->src = <a class="code" href="../../d2/d6e/def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>(pcb->local_port);</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  tcphdr->dest = <a class="code" href="../../d2/d6e/def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>(pcb->remote_port);</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  tcphdr->seqno = seqno_be;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  tcphdr->ackno = <a class="code" href="../../d2/d6e/def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(pcb->rcv_nxt);</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a57fb29aed8df21ccff4481612ee40407">TCPH_HDRLEN_FLAGS_SET</a>(tcphdr, (5 + optlen / 4), <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>);</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  tcphdr->wnd = <a class="code" href="../../d2/d6e/def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>(TCPWND_MIN16(RCV_WND_SCALE(pcb, pcb->rcv_ann_wnd)));</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  tcphdr->chksum = 0;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  tcphdr->urgp = 0;</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  </div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="comment">/* If we're sending a packet, update the announced right window edge */</span></div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  pcb->rcv_ann_right_edge = pcb->rcv_nxt + pcb->rcv_ann_wnd;</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordflow">return</span> p;</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> }</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  </div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a></div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span> tcp_send_fin(<span class="keyword">struct</span> tcp_pcb *pcb)</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span> {</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="comment">/* first, try to add the fin to the last unsent segment */</span></div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</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="l00143"></a><span class="lineno"> 143</span>  <span class="keyword">struct </span>tcp_seg *last_unsent;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <span class="keywordflow">for</span> (last_unsent = pcb->unsent; last_unsent->next != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  last_unsent = last_unsent->next);</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  </div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">if</span> ((<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(last_unsent->tcphdr) & (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a> | <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a> | <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5ca559def464ef20d8b1f7d32f2f160d">TCP_RST</a>)) == 0) {</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  <span class="comment">/* no SYN/FIN/RST flag in the header, we can add the FIN flag */</span></div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a42432f2dde6716ecb0087ccbc47cc75b">TCPH_SET_FLAG</a>(last_unsent->tcphdr, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>);</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  pcb->flags |= TF_FIN;</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</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="l00152"></a><span class="lineno"> 152</span>  }</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  }</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>  <span class="comment">/* no data, no length, flags, copy=1, no optdata */</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  <span class="keywordflow">return</span> tcp_enqueue_flags(pcb, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>);</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> }</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  </div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span> <span class="keyword">static</span> <span class="keyword">struct </span>tcp_seg *</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span> tcp_create_segment(<span class="keyword">struct</span> tcp_pcb *pcb, <span class="keyword">struct</span> <a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> flags, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> seqno, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> optflags)</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span> {</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keyword">struct </span>tcp_seg *seg;</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> optlen = LWIP_TCP_OPT_LENGTH(optflags);</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  </div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keywordflow">if</span> ((seg = (<span class="keyword">struct</span> tcp_seg *)<a class="code" href="../../df/dff/memp_8h.html#a2b00593d086313c267b54a976bf67aa5">memp_malloc</a>(MEMP_TCP_SEG)) == <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>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#ga0269bdc51f1e8a5ecf9af72c6e1c996c">LWIP_DBG_LEVEL_SERIOUS</a>, (<span class="stringliteral">"tcp_create_segment: no memory.\n"</span>));</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(p);</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordflow">return</span> <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</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>  seg->flags = optflags;</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  seg->next = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  seg->p = p;</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"p->tot_len >= optlen"</span>, p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a> >= optlen);</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  seg->len = p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a> - optlen;</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span> <span class="preprocessor">#if TCP_OVERSIZE_DBGCHECK</span></div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  seg->oversize_left = 0;</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE_DBGCHECK */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY</span></div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>  seg->chksum = 0;</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  seg->chksum_swapped = 0;</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  <span class="comment">/* check optflags */</span></div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"invalid optflags passed: TF_SEG_DATA_CHECKSUMMED"</span>,</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  (optflags & TF_SEG_DATA_CHECKSUMMED) == 0);</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CHECKSUM_ON_COPY */</span><span class="preprocessor"></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">/* build TCP header */</span></div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  <span class="keywordflow">if</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="l00201"></a><span class="lineno"> 201</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#ga0269bdc51f1e8a5ecf9af72c6e1c996c">LWIP_DBG_LEVEL_SERIOUS</a>, (<span class="stringliteral">"tcp_create_segment: no room for TCP header in pbuf.\n"</span>));</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.err);</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  tcp_seg_free(seg);</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  <span class="keywordflow">return</span> <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  }</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  seg->tcphdr = (<span class="keyword">struct </span><a class="code" href="../../db/df4/structtcp__hdr.html">tcp_hdr</a> *)seg->p->payload;</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  seg->tcphdr->src = <a class="code" href="../../d2/d6e/def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>(pcb->local_port);</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  seg->tcphdr->dest = <a class="code" href="../../d2/d6e/def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>(pcb->remote_port);</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  seg->tcphdr->seqno = <a class="code" href="../../d2/d6e/def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(seqno);</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  <span class="comment">/* ackno is set in tcp_output */</span></div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a57fb29aed8df21ccff4481612ee40407">TCPH_HDRLEN_FLAGS_SET</a>(seg->tcphdr, (5 + optlen / 4), flags);</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>  <span class="comment">/* wnd and chksum are set in tcp_output */</span></div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  seg->tcphdr->urgp = 0;</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keywordflow">return</span> seg;</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span> }</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  </div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span> <span class="preprocessor">#if TCP_OVERSIZE</span></div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span> <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span> tcp_pbuf_prealloc(<a class="code" href="../../d7/d05/group__pbuf.html#gaee1baa59bb2f85ba575b5a8619ac1ebf">pbuf_layer</a> layer, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> length, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> max_length,</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> *oversize, <span class="keyword">struct</span> tcp_pcb *pcb, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> apiflags,</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> first_seg)</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span> {</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p;</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> alloc = length;</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  </div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span> <span class="preprocessor">#if LWIP_NETIF_TX_SINGLE_PBUF</span></div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga70624a5deb8b9199406372a7f3603ecf">LWIP_UNUSED_ARG</a>(max_length);</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga70624a5deb8b9199406372a7f3603ecf">LWIP_UNUSED_ARG</a>(pcb);</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga70624a5deb8b9199406372a7f3603ecf">LWIP_UNUSED_ARG</a>(apiflags);</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga70624a5deb8b9199406372a7f3603ecf">LWIP_UNUSED_ARG</a>(first_seg);</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>  alloc = max_length;</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span> <span class="preprocessor">#else </span><span class="comment">/* LWIP_NETIF_TX_SINGLE_PBUF */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>  <span class="keywordflow">if</span> (length < max_length) {</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>  <span class="comment">/* Should we allocate an oversized pbuf, or just the minimum</span></div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span> <span class="comment"> * length required? If tcp_write is going to be called again</span></div>
<div class="line"><a name="l00250"></a><span class="lineno"> 250</span> <span class="comment"> * before this segment is transmitted, we want the oversized</span></div>
<div class="line"><a name="l00251"></a><span class="lineno"> 251</span> <span class="comment"> * buffer. If the segment will be transmitted immediately, we can</span></div>
<div class="line"><a name="l00252"></a><span class="lineno"> 252</span> <span class="comment"> * save memory by allocating only length. We use a simple</span></div>
<div class="line"><a name="l00253"></a><span class="lineno"> 253</span> <span class="comment"> * heuristic based on the following information:</span></div>
<div class="line"><a name="l00254"></a><span class="lineno"> 254</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00255"></a><span class="lineno"> 255</span> <span class="comment"> * Did the user set TCP_WRITE_FLAG_MORE?</span></div>
<div class="line"><a name="l00256"></a><span class="lineno"> 256</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00257"></a><span class="lineno"> 257</span> <span class="comment"> * Will the Nagle algorithm defer transmission of this segment?</span></div>
<div class="line"><a name="l00258"></a><span class="lineno"> 258</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00259"></a><span class="lineno"> 259</span>  <span class="keywordflow">if</span> ((apiflags & TCP_WRITE_FLAG_MORE) ||</div>
<div class="line"><a name="l00260"></a><span class="lineno"> 260</span>  (!(pcb->flags & TF_NODELAY) &&</div>
<div class="line"><a name="l00261"></a><span class="lineno"> 261</span>  (!first_seg ||</div>
<div class="line"><a name="l00262"></a><span class="lineno"> 262</span>  pcb->unsent != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> ||</div>
<div class="line"><a name="l00263"></a><span class="lineno"> 263</span>  pcb->unacked != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>))) {</div>
<div class="line"><a name="l00264"></a><span class="lineno"> 264</span>  alloc = <a class="code" href="../../d4/da4/def_8h.html#a748f5df614a3fc989e8900fd229d6e4e">LWIP_MIN</a>(max_length, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaef204be511fd32f681b55abc08e9ae18">LWIP_MEM_ALIGN_SIZE</a>(TCP_OVERSIZE_CALC_LENGTH(length)));</div>
<div class="line"><a name="l00265"></a><span class="lineno"> 265</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> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_NETIF_TX_SINGLE_PBUF */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  p = <a class="code" href="../../d7/d05/group__pbuf.html#gacfcb0a2af918658ba0afe36499c65f47">pbuf_alloc</a>(layer, alloc, <a class="code" href="../../d7/d05/group__pbuf.html#ggab7e0e32fcc292c0d7107721766ed92fbac5e9f28455bca98944a030d4b84ecfab">PBUF_RAM</a>);</div>
<div class="line"><a name="l00269"></a><span class="lineno"> 269</span>  <span class="keywordflow">if</span> (p == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="keywordflow">return</span> <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  }</div>
<div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"need unchained pbuf"</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="l00273"></a><span class="lineno"> 273</span>  *oversize = p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> - length;</div>
<div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="comment">/* trim p->len to the currently used size */</span></div>
<div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> = p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a> = length;</div>
<div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keywordflow">return</span> p;</div>
<div class="line"><a name="l00277"></a><span class="lineno"> 277</span> }</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span> <span class="preprocessor">#else </span><span class="comment">/* TCP_OVERSIZE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span> <span class="preprocessor">#define tcp_pbuf_prealloc(layer, length, mx, os, pcb, api, fst) pbuf_alloc((layer), (length), PBUF_RAM)</span></div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  </div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY</span></div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  </div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span> tcp_seg_add_chksum(<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> chksum, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> *seg_chksum,</div>
<div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *seg_chksum_swapped)</div>
<div class="line"><a name="l00287"></a><span class="lineno"> 287</span> {</div>
<div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> helper;</div>
<div class="line"><a name="l00289"></a><span class="lineno"> 289</span>  <span class="comment">/* add chksum to old chksum and fold to u16_t */</span></div>
<div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  helper = chksum + *seg_chksum;</div>
<div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  chksum = <a class="code" href="../../d2/d45/inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(helper);</div>
<div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  <span class="keywordflow">if</span> ((<a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> & 1) != 0) {</div>
<div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  *seg_chksum_swapped = 1 - *seg_chksum_swapped;</div>
<div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  chksum = <a class="code" href="../../d2/d45/inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a>(chksum);</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>  *seg_chksum = chksum;</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span> }</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CHECKSUM_ON_COPY */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  </div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</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="l00307"></a><span class="lineno"> 307</span> tcp_write_checks(<span class="keyword">struct</span> tcp_pcb *pcb, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>)</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span> {</div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  <span class="comment">/* connection is in invalid state for data transmission? */</span></div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  <span class="keywordflow">if</span> ((pcb->state != ESTABLISHED) &&</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  (pcb->state != CLOSE_WAIT) &&</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  (pcb->state != SYN_SENT) &&</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  (pcb->state != SYN_RCVD)) {</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#ga511ee3deb3240635f5ec6a1709c6d741">LWIP_DBG_STATE</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#gaab41143277cd38047b6660d90e9cec3b">LWIP_DBG_LEVEL_SEVERE</a>, (<span class="stringliteral">"tcp_write() called in invalid state\n"</span>));</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcab0036c51817b5200bfe8157cc4115b27">ERR_CONN</a>;</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (<a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> == 0) {</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</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="l00318"></a><span class="lineno"> 318</span>  }</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>  <span class="comment">/* fail on too much data */</span></div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> > pcb->snd_buf) {</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#gaab41143277cd38047b6660d90e9cec3b">LWIP_DBG_LEVEL_SEVERE</a>, (<span class="stringliteral">"tcp_write: too much data (len=%"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" > snd_buf=%"</span>TCPWNDSIZE_F<span class="stringliteral">")\n"</span>,</div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  <a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>, pcb->snd_buf));</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  pcb->flags |= TF_NAGLEMEMERR;</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaaaeafdbf3aecc46864daa3cd829c7e05">ERR_MEM</a>;</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>  <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_write: queuelen: %"</span>TCPWNDSIZE_F<span class="stringliteral">"\n"</span>, (tcpwnd_size_t)pcb->snd_queuelen));</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  </div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  <span class="comment">/* If total number of pbufs on the unsent/unacked queues exceeds the</span></div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span> <span class="comment"> * configured maximum, return an error */</span></div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>  <span class="comment">/* check for configured max queuelen and possible overflow */</span></div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  <span class="keywordflow">if</span> ((pcb->snd_queuelen >= <a class="code" href="../../d2/d78/lwipopts_8h.html#a9beaa47832ead4180981bfbf71074904">TCP_SND_QUEUELEN</a>) || (pcb->snd_queuelen > TCP_SNDQUEUELEN_OVERFLOW)) {</div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#gaab41143277cd38047b6660d90e9cec3b">LWIP_DBG_LEVEL_SEVERE</a>, (<span class="stringliteral">"tcp_write: too long queue %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" (max %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">")\n"</span>,</div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  pcb->snd_queuelen, (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)<a class="code" href="../../d2/d78/lwipopts_8h.html#a9beaa47832ead4180981bfbf71074904">TCP_SND_QUEUELEN</a>));</div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.memerr);</div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  pcb->flags |= TF_NAGLEMEMERR;</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaaaeafdbf3aecc46864daa3cd829c7e05">ERR_MEM</a>;</div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  }</div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  <span class="keywordflow">if</span> (pcb->snd_queuelen != 0) {</div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_write: pbufs on queue => at least one queue non-empty"</span>,</div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</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="l00343"></a><span class="lineno"> 343</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_write: no pbufs on queue => both queues empty"</span>,</div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</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="l00346"></a><span class="lineno"> 346</span>  }</div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</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="l00348"></a><span class="lineno"> 348</span> }</div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  </div>
<div class="line"><a name="l00367"></a><span class="lineno"> 367</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a></div>
<div class="line"><a name="l00368"></a><span class="lineno"> 368</span> tcp_write(<span class="keyword">struct</span> tcp_pcb *pcb, <span class="keyword">const</span> <span class="keywordtype">void</span> *arg, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> <a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> apiflags)</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>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *concat_p = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00371"></a><span class="lineno"> 371</span>  <span class="keyword">struct </span>tcp_seg *last_unsent = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, *seg = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, *prev_seg = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, *queue = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00372"></a><span class="lineno"> 372</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> pos = 0; <span class="comment">/* position in 'arg' data */</span></div>
<div class="line"><a name="l00373"></a><span class="lineno"> 373</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> queuelen;</div>
<div class="line"><a name="l00374"></a><span class="lineno"> 374</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> optlen = 0;</div>
<div class="line"><a name="l00375"></a><span class="lineno"> 375</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> optflags = 0;</div>
<div class="line"><a name="l00376"></a><span class="lineno"> 376</span> <span class="preprocessor">#if TCP_OVERSIZE</span></div>
<div class="line"><a name="l00377"></a><span class="lineno"> 377</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> oversize = 0;</div>
<div class="line"><a name="l00378"></a><span class="lineno"> 378</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> oversize_used = 0;</div>
<div class="line"><a name="l00379"></a><span class="lineno"> 379</span> <span class="preprocessor">#if TCP_OVERSIZE_DBGCHECK</span></div>
<div class="line"><a name="l00380"></a><span class="lineno"> 380</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> oversize_add = 0;</div>
<div class="line"><a name="l00381"></a><span class="lineno"> 381</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE_DBGCHECK*/</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00382"></a><span class="lineno"> 382</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00383"></a><span class="lineno"> 383</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> extendlen = 0;</div>
<div class="line"><a name="l00384"></a><span class="lineno"> 384</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY</span></div>
<div class="line"><a name="l00385"></a><span class="lineno"> 385</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> concat_chksum = 0;</div>
<div class="line"><a name="l00386"></a><span class="lineno"> 386</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> concat_chksum_swapped = 0;</div>
<div class="line"><a name="l00387"></a><span class="lineno"> 387</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> concat_chksummed = 0;</div>
<div class="line"><a name="l00388"></a><span class="lineno"> 388</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CHECKSUM_ON_COPY */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00389"></a><span class="lineno"> 389</span>  <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err;</div>
<div class="line"><a name="l00390"></a><span class="lineno"> 390</span>  <span class="comment">/* don't allocate segments bigger than half the maximum window we ever received */</span></div>
<div class="line"><a name="l00391"></a><span class="lineno"> 391</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> mss_local = <a class="code" href="../../d4/da4/def_8h.html#a748f5df614a3fc989e8900fd229d6e4e">LWIP_MIN</a>(pcb->mss, TCPWND_MIN16(pcb->snd_wnd_max/2));</div>
<div class="line"><a name="l00392"></a><span class="lineno"> 392</span>  mss_local = mss_local ? mss_local : pcb->mss;</div>
<div class="line"><a name="l00393"></a><span class="lineno"> 393</span>  </div>
<div class="line"><a name="l00394"></a><span class="lineno"> 394</span> <span class="preprocessor">#if LWIP_NETIF_TX_SINGLE_PBUF</span></div>
<div class="line"><a name="l00395"></a><span class="lineno"> 395</span>  <span class="comment">/* Always copy to try to create single pbufs for TX */</span></div>
<div class="line"><a name="l00396"></a><span class="lineno"> 396</span>  apiflags |= TCP_WRITE_FLAG_COPY;</div>
<div class="line"><a name="l00397"></a><span class="lineno"> 397</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_NETIF_TX_SINGLE_PBUF */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00398"></a><span class="lineno"> 398</span>  </div>
<div class="line"><a name="l00399"></a><span class="lineno"> 399</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a>, (<span class="stringliteral">"tcp_write(pcb=%p, data=%p, len=%"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">", apiflags=%"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">")\n"</span>,</div>
<div class="line"><a name="l00400"></a><span class="lineno"> 400</span>  (<span class="keywordtype">void</span> *)pcb, arg, len, (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)apiflags));</div>
<div class="line"><a name="l00401"></a><span class="lineno"> 401</span>  <a class="code" href="../../db/d16/debug_8h.html#a827bc03cd7889e7c007df39d33b33d18">LWIP_ERROR</a>(<span class="stringliteral">"tcp_write: arg == NULL (programmer violates API)"</span>,</div>
<div class="line"><a name="l00402"></a><span class="lineno"> 402</span>  arg != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>, <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcab508ce0ebdf3ca735208b00a80a45c91">ERR_ARG</a>;);</div>
<div class="line"><a name="l00403"></a><span class="lineno"> 403</span>  </div>
<div class="line"><a name="l00404"></a><span class="lineno"> 404</span>  err = tcp_write_checks(pcb, len);</div>
<div class="line"><a name="l00405"></a><span class="lineno"> 405</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="l00406"></a><span class="lineno"> 406</span>  <span class="keywordflow">return</span> err;</div>
<div class="line"><a name="l00407"></a><span class="lineno"> 407</span>  }</div>
<div class="line"><a name="l00408"></a><span class="lineno"> 408</span>  queuelen = pcb->snd_queuelen;</div>
<div class="line"><a name="l00409"></a><span class="lineno"> 409</span>  </div>
<div class="line"><a name="l00410"></a><span class="lineno"> 410</span> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS</span></div>
<div class="line"><a name="l00411"></a><span class="lineno"> 411</span>  <span class="keywordflow">if</span> ((pcb->flags & TF_TIMESTAMP)) {</div>
<div class="line"><a name="l00412"></a><span class="lineno"> 412</span>  <span class="comment">/* Make sure the timestamp option is only included in data segments if we</span></div>
<div class="line"><a name="l00413"></a><span class="lineno"> 413</span> <span class="comment"> agreed about it with the remote host. */</span></div>
<div class="line"><a name="l00414"></a><span class="lineno"> 414</span>  optflags = TF_SEG_OPTS_TS;</div>
<div class="line"><a name="l00415"></a><span class="lineno"> 415</span>  optlen = LWIP_TCP_OPT_LENGTH(TF_SEG_OPTS_TS);</div>
<div class="line"><a name="l00416"></a><span class="lineno"> 416</span>  <span class="comment">/* ensure that segments can hold at least one data byte... */</span></div>
<div class="line"><a name="l00417"></a><span class="lineno"> 417</span>  mss_local = <a class="code" href="../../d4/da4/def_8h.html#a21ea174d374106caeafb4aa3a24fbd2b">LWIP_MAX</a>(mss_local, LWIP_TCP_OPT_LEN_TS + 1);</div>
<div class="line"><a name="l00418"></a><span class="lineno"> 418</span>  }</div>
<div class="line"><a name="l00419"></a><span class="lineno"> 419</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_TCP_TIMESTAMPS */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00420"></a><span class="lineno"> 420</span>  </div>
<div class="line"><a name="l00421"></a><span class="lineno"> 421</span>  </div>
<div class="line"><a name="l00422"></a><span class="lineno"> 422</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00423"></a><span class="lineno"> 423</span> <span class="comment"> * TCP segmentation is done in three phases with increasing complexity:</span></div>
<div class="line"><a name="l00424"></a><span class="lineno"> 424</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00425"></a><span class="lineno"> 425</span> <span class="comment"> * 1. Copy data directly into an oversized pbuf.</span></div>
<div class="line"><a name="l00426"></a><span class="lineno"> 426</span> <span class="comment"> * 2. Chain a new pbuf to the end of pcb->unsent.</span></div>
<div class="line"><a name="l00427"></a><span class="lineno"> 427</span> <span class="comment"> * 3. Create new segments.</span></div>
<div class="line"><a name="l00428"></a><span class="lineno"> 428</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00429"></a><span class="lineno"> 429</span> <span class="comment"> * We may run out of memory at any point. In that case we must</span></div>
<div class="line"><a name="l00430"></a><span class="lineno"> 430</span> <span class="comment"> * return ERR_MEM and not change anything in pcb. Therefore, all</span></div>
<div class="line"><a name="l00431"></a><span class="lineno"> 431</span> <span class="comment"> * changes are recorded in local variables and committed at the end</span></div>
<div class="line"><a name="l00432"></a><span class="lineno"> 432</span> <span class="comment"> * of the function. Some pcb fields are maintained in local copies:</span></div>
<div class="line"><a name="l00433"></a><span class="lineno"> 433</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00434"></a><span class="lineno"> 434</span> <span class="comment"> * queuelen = pcb->snd_queuelen</span></div>
<div class="line"><a name="l00435"></a><span class="lineno"> 435</span> <span class="comment"> * oversize = pcb->unsent_oversize</span></div>
<div class="line"><a name="l00436"></a><span class="lineno"> 436</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00437"></a><span class="lineno"> 437</span> <span class="comment"> * These variables are set consistently by the phases:</span></div>
<div class="line"><a name="l00438"></a><span class="lineno"> 438</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00439"></a><span class="lineno"> 439</span> <span class="comment"> * seg points to the last segment tampered with.</span></div>
<div class="line"><a name="l00440"></a><span class="lineno"> 440</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00441"></a><span class="lineno"> 441</span> <span class="comment"> * pos records progress as data is segmented.</span></div>
<div class="line"><a name="l00442"></a><span class="lineno"> 442</span> <span class="comment"> */</span></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>  <span class="comment">/* Find the tail of the unsent queue. */</span></div>
<div class="line"><a name="l00445"></a><span class="lineno"> 445</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="l00446"></a><span class="lineno"> 446</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> space;</div>
<div class="line"><a name="l00447"></a><span class="lineno"> 447</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> unsent_optlen;</div>
<div class="line"><a name="l00448"></a><span class="lineno"> 448</span>  </div>
<div class="line"><a name="l00449"></a><span class="lineno"> 449</span>  <span class="comment">/* @todo: this could be sped up by keeping last_unsent in the pcb */</span></div>
<div class="line"><a name="l00450"></a><span class="lineno"> 450</span>  <span class="keywordflow">for</span> (last_unsent = pcb->unsent; last_unsent->next != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l00451"></a><span class="lineno"> 451</span>  last_unsent = last_unsent->next);</div>
<div class="line"><a name="l00452"></a><span class="lineno"> 452</span>  </div>
<div class="line"><a name="l00453"></a><span class="lineno"> 453</span>  <span class="comment">/* Usable space at the end of the last unsent segment */</span></div>
<div class="line"><a name="l00454"></a><span class="lineno"> 454</span>  unsent_optlen = LWIP_TCP_OPT_LENGTH(last_unsent->flags);</div>
<div class="line"><a name="l00455"></a><span class="lineno"> 455</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"mss_local is too small"</span>, mss_local >= last_unsent->len + unsent_optlen);</div>
<div class="line"><a name="l00456"></a><span class="lineno"> 456</span>  space = mss_local - (last_unsent->len + unsent_optlen);</div>
<div class="line"><a name="l00457"></a><span class="lineno"> 457</span>  </div>
<div class="line"><a name="l00458"></a><span class="lineno"> 458</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00459"></a><span class="lineno"> 459</span> <span class="comment"> * Phase 1: Copy data directly into an oversized pbuf.</span></div>
<div class="line"><a name="l00460"></a><span class="lineno"> 460</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00461"></a><span class="lineno"> 461</span> <span class="comment"> * The number of bytes copied is recorded in the oversize_used</span></div>
<div class="line"><a name="l00462"></a><span class="lineno"> 462</span> <span class="comment"> * variable. The actual copying is done at the bottom of the</span></div>
<div class="line"><a name="l00463"></a><span class="lineno"> 463</span> <span class="comment"> * function.</span></div>
<div class="line"><a name="l00464"></a><span class="lineno"> 464</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00465"></a><span class="lineno"> 465</span> <span class="preprocessor">#if TCP_OVERSIZE</span></div>
<div class="line"><a name="l00466"></a><span class="lineno"> 466</span> <span class="preprocessor">#if TCP_OVERSIZE_DBGCHECK</span></div>
<div class="line"><a name="l00467"></a><span class="lineno"> 467</span>  <span class="comment">/* check that pcb->unsent_oversize matches last_unsent->oversize_left */</span></div>
<div class="line"><a name="l00468"></a><span class="lineno"> 468</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"unsent_oversize mismatch (pcb vs. last_unsent)"</span>,</div>
<div class="line"><a name="l00469"></a><span class="lineno"> 469</span>  pcb->unsent_oversize == last_unsent->oversize_left);</div>
<div class="line"><a name="l00470"></a><span class="lineno"> 470</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE_DBGCHECK */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00471"></a><span class="lineno"> 471</span>  oversize = pcb->unsent_oversize;</div>
<div class="line"><a name="l00472"></a><span class="lineno"> 472</span>  <span class="keywordflow">if</span> (oversize > 0) {</div>
<div class="line"><a name="l00473"></a><span class="lineno"> 473</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"inconsistent oversize vs. space"</span>, oversize <= space);</div>
<div class="line"><a name="l00474"></a><span class="lineno"> 474</span>  seg = last_unsent;</div>
<div class="line"><a name="l00475"></a><span class="lineno"> 475</span>  oversize_used = <a class="code" href="../../d4/da4/def_8h.html#a748f5df614a3fc989e8900fd229d6e4e">LWIP_MIN</a>(space, <a class="code" href="../../d4/da4/def_8h.html#a748f5df614a3fc989e8900fd229d6e4e">LWIP_MIN</a>(oversize, len));</div>
<div class="line"><a name="l00476"></a><span class="lineno"> 476</span>  pos += oversize_used;</div>
<div class="line"><a name="l00477"></a><span class="lineno"> 477</span>  oversize -= oversize_used;</div>
<div class="line"><a name="l00478"></a><span class="lineno"> 478</span>  space -= oversize_used;</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>  <span class="comment">/* now we are either finished or oversize is zero */</span></div>
<div class="line"><a name="l00481"></a><span class="lineno"> 481</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"inconsistent oversize vs. len"</span>, (oversize == 0) || (pos == len));</div>
<div class="line"><a name="l00482"></a><span class="lineno"> 482</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00483"></a><span class="lineno"> 483</span>  </div>
<div class="line"><a name="l00484"></a><span class="lineno"> 484</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00485"></a><span class="lineno"> 485</span> <span class="comment"> * Phase 2: Chain a new pbuf to the end of pcb->unsent.</span></div>
<div class="line"><a name="l00486"></a><span class="lineno"> 486</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00487"></a><span class="lineno"> 487</span> <span class="comment"> * As an exception when NOT copying the data, if the given data buffer</span></div>
<div class="line"><a name="l00488"></a><span class="lineno"> 488</span> <span class="comment"> * directly follows the last unsent data buffer in memory, extend the last</span></div>
<div class="line"><a name="l00489"></a><span class="lineno"> 489</span> <span class="comment"> * ROM pbuf reference to the buffer, thus saving a ROM pbuf allocation.</span></div>
<div class="line"><a name="l00490"></a><span class="lineno"> 490</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00491"></a><span class="lineno"> 491</span> <span class="comment"> * We don't extend segments containing SYN/FIN flags or options</span></div>
<div class="line"><a name="l00492"></a><span class="lineno"> 492</span> <span class="comment"> * (len==0). The new pbuf is kept in concat_p and pbuf_cat'ed at</span></div>
<div class="line"><a name="l00493"></a><span class="lineno"> 493</span> <span class="comment"> * the end.</span></div>
<div class="line"><a name="l00494"></a><span class="lineno"> 494</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00495"></a><span class="lineno"> 495</span>  <span class="keywordflow">if</span> ((pos < len) && (space > 0) && (last_unsent->len > 0)) {</div>
<div class="line"><a name="l00496"></a><span class="lineno"> 496</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> seglen = <a class="code" href="../../d4/da4/def_8h.html#a748f5df614a3fc989e8900fd229d6e4e">LWIP_MIN</a>(space, len - pos);</div>
<div class="line"><a name="l00497"></a><span class="lineno"> 497</span>  seg = last_unsent;</div>
<div class="line"><a name="l00498"></a><span class="lineno"> 498</span>  </div>
<div class="line"><a name="l00499"></a><span class="lineno"> 499</span>  <span class="comment">/* Create a pbuf with a copy or reference to seglen bytes. We</span></div>
<div class="line"><a name="l00500"></a><span class="lineno"> 500</span> <span class="comment"> * can use PBUF_RAW here since the data appears in the middle of</span></div>
<div class="line"><a name="l00501"></a><span class="lineno"> 501</span> <span class="comment"> * a segment. A header will never be prepended. */</span></div>
<div class="line"><a name="l00502"></a><span class="lineno"> 502</span>  <span class="keywordflow">if</span> (apiflags & TCP_WRITE_FLAG_COPY) {</div>
<div class="line"><a name="l00503"></a><span class="lineno"> 503</span>  <span class="comment">/* Data is copied */</span></div>
<div class="line"><a name="l00504"></a><span class="lineno"> 504</span>  <span class="keywordflow">if</span> ((concat_p = tcp_pbuf_prealloc(<a class="code" href="../../d7/d05/group__pbuf.html#ggaee1baa59bb2f85ba575b5a8619ac1ebfa21116654fbab6d5a4dfeb87a1bb8f0ba">PBUF_RAW</a>, seglen, space, &oversize, pcb, apiflags, 1)) == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00505"></a><span class="lineno"> 505</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#ga0269bdc51f1e8a5ecf9af72c6e1c996c">LWIP_DBG_LEVEL_SERIOUS</a>,</div>
<div class="line"><a name="l00506"></a><span class="lineno"> 506</span>  (<span class="stringliteral">"tcp_write : could not allocate memory for pbuf copy size %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l00507"></a><span class="lineno"> 507</span>  seglen));</div>
<div class="line"><a name="l00508"></a><span class="lineno"> 508</span>  <span class="keywordflow">goto</span> memerr;</div>
<div class="line"><a name="l00509"></a><span class="lineno"> 509</span>  }</div>
<div class="line"><a name="l00510"></a><span class="lineno"> 510</span> <span class="preprocessor">#if TCP_OVERSIZE_DBGCHECK</span></div>
<div class="line"><a name="l00511"></a><span class="lineno"> 511</span>  oversize_add = oversize;</div>
<div class="line"><a name="l00512"></a><span class="lineno"> 512</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE_DBGCHECK */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00513"></a><span class="lineno"> 513</span>  TCP_DATA_COPY2(concat_p-><a class="code" href="../../d9/db8/structpbuf.html#a8d32dc3e964369d4eec638fc37fbc460">payload</a>, (<span class="keyword">const</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>*)arg + pos, seglen, &concat_chksum, &concat_chksum_swapped);</div>
<div class="line"><a name="l00514"></a><span class="lineno"> 514</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY</span></div>
<div class="line"><a name="l00515"></a><span class="lineno"> 515</span>  concat_chksummed += seglen;</div>
<div class="line"><a name="l00516"></a><span class="lineno"> 516</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CHECKSUM_ON_COPY */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00517"></a><span class="lineno"> 517</span>  queuelen += <a class="code" href="../../d0/d35/pbuf_8h.html#a5df7ac5ae59012fe9aeddba375a72190">pbuf_clen</a>(concat_p);</div>
<div class="line"><a name="l00518"></a><span class="lineno"> 518</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00519"></a><span class="lineno"> 519</span>  <span class="comment">/* Data is not copied */</span></div>
<div class="line"><a name="l00520"></a><span class="lineno"> 520</span>  <span class="comment">/* If the last unsent pbuf is of type PBUF_ROM, try to extend it. */</span></div>
<div class="line"><a name="l00521"></a><span class="lineno"> 521</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p;</div>
<div class="line"><a name="l00522"></a><span class="lineno"> 522</span>  <span class="keywordflow">for</span> (p = last_unsent->p; 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>; p = p-><a class="code" href="../../d9/db8/structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>);</div>
<div class="line"><a name="l00523"></a><span class="lineno"> 523</span>  <span class="keywordflow">if</span> (p-><a class="code" href="../../d9/db8/structpbuf.html#afd7bff5210a022424caa97d2f25fe8e6">type</a> == <a class="code" href="../../d7/d05/group__pbuf.html#ggab7e0e32fcc292c0d7107721766ed92fbac120b0fe39efe35bb682e4aa3b82e2c9">PBUF_ROM</a> && (<span class="keyword">const</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)p-><a class="code" href="../../d9/db8/structpbuf.html#a8d32dc3e964369d4eec638fc37fbc460">payload</a> + p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> == (<span class="keyword">const</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)arg) {</div>
<div class="line"><a name="l00524"></a><span class="lineno"> 524</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_write: ROM pbufs cannot be oversized"</span>, pos == 0);</div>
<div class="line"><a name="l00525"></a><span class="lineno"> 525</span>  extendlen = seglen;</div>
<div class="line"><a name="l00526"></a><span class="lineno"> 526</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00527"></a><span class="lineno"> 527</span>  <span class="keywordflow">if</span> ((concat_p = <a class="code" href="../../d7/d05/group__pbuf.html#gacfcb0a2af918658ba0afe36499c65f47">pbuf_alloc</a>(<a class="code" href="../../d7/d05/group__pbuf.html#ggaee1baa59bb2f85ba575b5a8619ac1ebfa21116654fbab6d5a4dfeb87a1bb8f0ba">PBUF_RAW</a>, seglen, <a class="code" href="../../d7/d05/group__pbuf.html#ggab7e0e32fcc292c0d7107721766ed92fbac120b0fe39efe35bb682e4aa3b82e2c9">PBUF_ROM</a>)) == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00528"></a><span class="lineno"> 528</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#ga0269bdc51f1e8a5ecf9af72c6e1c996c">LWIP_DBG_LEVEL_SERIOUS</a>,</div>
<div class="line"><a name="l00529"></a><span class="lineno"> 529</span>  (<span class="stringliteral">"tcp_write: could not allocate memory for zero-copy pbuf\n"</span>));</div>
<div class="line"><a name="l00530"></a><span class="lineno"> 530</span>  <span class="keywordflow">goto</span> memerr;</div>
<div class="line"><a name="l00531"></a><span class="lineno"> 531</span>  }</div>
<div class="line"><a name="l00532"></a><span class="lineno"> 532</span>  <span class="comment">/* reference the non-volatile payload data */</span></div>
<div class="line"><a name="l00533"></a><span class="lineno"> 533</span>  ((<span class="keyword">struct </span><a class="code" href="../../df/d33/structpbuf__rom.html">pbuf_rom</a>*)concat_p)->payload = (<span class="keyword">const</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>*)arg + pos;</div>
<div class="line"><a name="l00534"></a><span class="lineno"> 534</span>  queuelen += <a class="code" href="../../d0/d35/pbuf_8h.html#a5df7ac5ae59012fe9aeddba375a72190">pbuf_clen</a>(concat_p);</div>
<div class="line"><a name="l00535"></a><span class="lineno"> 535</span>  }</div>
<div class="line"><a name="l00536"></a><span class="lineno"> 536</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY</span></div>
<div class="line"><a name="l00537"></a><span class="lineno"> 537</span>  <span class="comment">/* calculate the checksum of nocopy-data */</span></div>
<div class="line"><a name="l00538"></a><span class="lineno"> 538</span>  tcp_seg_add_chksum(~<a class="code" href="../../d2/d45/inet__chksum_8h.html#a34f1aa1587562a09e11b704b51bab043">inet_chksum</a>((<span class="keyword">const</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>*)arg + pos, seglen), seglen,</div>
<div class="line"><a name="l00539"></a><span class="lineno"> 539</span>  &concat_chksum, &concat_chksum_swapped);</div>
<div class="line"><a name="l00540"></a><span class="lineno"> 540</span>  concat_chksummed += seglen;</div>
<div class="line"><a name="l00541"></a><span class="lineno"> 541</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CHECKSUM_ON_COPY */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00542"></a><span class="lineno"> 542</span>  }</div>
<div class="line"><a name="l00543"></a><span class="lineno"> 543</span>  </div>
<div class="line"><a name="l00544"></a><span class="lineno"> 544</span>  pos += seglen;</div>
<div class="line"><a name="l00545"></a><span class="lineno"> 545</span>  }</div>
<div class="line"><a name="l00546"></a><span class="lineno"> 546</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00547"></a><span class="lineno"> 547</span> <span class="preprocessor">#if TCP_OVERSIZE</span></div>
<div class="line"><a name="l00548"></a><span class="lineno"> 548</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"unsent_oversize mismatch (pcb->unsent is NULL)"</span>,</div>
<div class="line"><a name="l00549"></a><span class="lineno"> 549</span>  pcb->unsent_oversize == 0);</div>
<div class="line"><a name="l00550"></a><span class="lineno"> 550</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00551"></a><span class="lineno"> 551</span>  }</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>  <span class="comment">/*</span></div>
<div class="line"><a name="l00554"></a><span class="lineno"> 554</span> <span class="comment"> * Phase 3: Create new segments.</span></div>
<div class="line"><a name="l00555"></a><span class="lineno"> 555</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00556"></a><span class="lineno"> 556</span> <span class="comment"> * The new segments are chained together in the local 'queue'</span></div>
<div class="line"><a name="l00557"></a><span class="lineno"> 557</span> <span class="comment"> * variable, ready to be appended to pcb->unsent.</span></div>
<div class="line"><a name="l00558"></a><span class="lineno"> 558</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00559"></a><span class="lineno"> 559</span>  <span class="keywordflow">while</span> (pos < len) {</div>
<div class="line"><a name="l00560"></a><span class="lineno"> 560</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p;</div>
<div class="line"><a name="l00561"></a><span class="lineno"> 561</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> left = <a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> - pos;</div>
<div class="line"><a name="l00562"></a><span class="lineno"> 562</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> max_len = mss_local - optlen;</div>
<div class="line"><a name="l00563"></a><span class="lineno"> 563</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> seglen = <a class="code" href="../../d4/da4/def_8h.html#a748f5df614a3fc989e8900fd229d6e4e">LWIP_MIN</a>(left, max_len);</div>
<div class="line"><a name="l00564"></a><span class="lineno"> 564</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY</span></div>
<div class="line"><a name="l00565"></a><span class="lineno"> 565</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> chksum = 0;</div>
<div class="line"><a name="l00566"></a><span class="lineno"> 566</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> chksum_swapped = 0;</div>
<div class="line"><a name="l00567"></a><span class="lineno"> 567</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CHECKSUM_ON_COPY */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00568"></a><span class="lineno"> 568</span>  </div>
<div class="line"><a name="l00569"></a><span class="lineno"> 569</span>  <span class="keywordflow">if</span> (apiflags & TCP_WRITE_FLAG_COPY) {</div>
<div class="line"><a name="l00570"></a><span class="lineno"> 570</span>  <span class="comment">/* If copy is set, memory should be allocated and data copied</span></div>
<div class="line"><a name="l00571"></a><span class="lineno"> 571</span> <span class="comment"> * into pbuf */</span></div>
<div class="line"><a name="l00572"></a><span class="lineno"> 572</span>  <span class="keywordflow">if</span> ((p = tcp_pbuf_prealloc(<a class="code" href="../../d7/d05/group__pbuf.html#ggaee1baa59bb2f85ba575b5a8619ac1ebfa2ded3594a3977f8bf9cf09552be327b5">PBUF_TRANSPORT</a>, seglen + optlen, mss_local, &oversize, pcb, apiflags, queue == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>)) == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00573"></a><span class="lineno"> 573</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#ga0269bdc51f1e8a5ecf9af72c6e1c996c">LWIP_DBG_LEVEL_SERIOUS</a>, (<span class="stringliteral">"tcp_write : could not allocate memory for pbuf copy size %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">"\n"</span>, seglen));</div>
<div class="line"><a name="l00574"></a><span class="lineno"> 574</span>  <span class="keywordflow">goto</span> memerr;</div>
<div class="line"><a name="l00575"></a><span class="lineno"> 575</span>  }</div>
<div class="line"><a name="l00576"></a><span class="lineno"> 576</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_write: check that first pbuf can hold the complete seglen"</span>,</div>
<div class="line"><a name="l00577"></a><span class="lineno"> 577</span>  (p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> >= seglen));</div>
<div class="line"><a name="l00578"></a><span class="lineno"> 578</span>  TCP_DATA_COPY2((<span class="keywordtype">char</span> *)p-><a class="code" href="../../d9/db8/structpbuf.html#a8d32dc3e964369d4eec638fc37fbc460">payload</a> + optlen, (<span class="keyword">const</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>*)arg + pos, seglen, &chksum, &chksum_swapped);</div>
<div class="line"><a name="l00579"></a><span class="lineno"> 579</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00580"></a><span class="lineno"> 580</span>  <span class="comment">/* Copy is not set: First allocate a pbuf for holding the data.</span></div>
<div class="line"><a name="l00581"></a><span class="lineno"> 581</span> <span class="comment"> * Since the referenced data is available at least until it is</span></div>
<div class="line"><a name="l00582"></a><span class="lineno"> 582</span> <span class="comment"> * sent out on the link (as it has to be ACKed by the remote</span></div>
<div class="line"><a name="l00583"></a><span class="lineno"> 583</span> <span class="comment"> * party) we can safely use PBUF_ROM instead of PBUF_REF here.</span></div>
<div class="line"><a name="l00584"></a><span class="lineno"> 584</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00585"></a><span class="lineno"> 585</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p2;</div>
<div class="line"><a name="l00586"></a><span class="lineno"> 586</span> <span class="preprocessor">#if TCP_OVERSIZE</span></div>
<div class="line"><a name="l00587"></a><span class="lineno"> 587</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"oversize == 0"</span>, oversize == 0);</div>
<div class="line"><a name="l00588"></a><span class="lineno"> 588</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00589"></a><span class="lineno"> 589</span>  <span class="keywordflow">if</span> ((p2 = <a class="code" href="../../d7/d05/group__pbuf.html#gacfcb0a2af918658ba0afe36499c65f47">pbuf_alloc</a>(<a class="code" href="../../d7/d05/group__pbuf.html#ggaee1baa59bb2f85ba575b5a8619ac1ebfa2ded3594a3977f8bf9cf09552be327b5">PBUF_TRANSPORT</a>, seglen, <a class="code" href="../../d7/d05/group__pbuf.html#ggab7e0e32fcc292c0d7107721766ed92fbac120b0fe39efe35bb682e4aa3b82e2c9">PBUF_ROM</a>)) == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00590"></a><span class="lineno"> 590</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#ga0269bdc51f1e8a5ecf9af72c6e1c996c">LWIP_DBG_LEVEL_SERIOUS</a>, (<span class="stringliteral">"tcp_write: could not allocate memory for zero-copy pbuf\n"</span>));</div>
<div class="line"><a name="l00591"></a><span class="lineno"> 591</span>  <span class="keywordflow">goto</span> memerr;</div>
<div class="line"><a name="l00592"></a><span class="lineno"> 592</span>  }</div>
<div class="line"><a name="l00593"></a><span class="lineno"> 593</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY</span></div>
<div class="line"><a name="l00594"></a><span class="lineno"> 594</span>  <span class="comment">/* calculate the checksum of nocopy-data */</span></div>
<div class="line"><a name="l00595"></a><span class="lineno"> 595</span>  chksum = ~<a class="code" href="../../d2/d45/inet__chksum_8h.html#a34f1aa1587562a09e11b704b51bab043">inet_chksum</a>((<span class="keyword">const</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>*)arg + pos, seglen);</div>
<div class="line"><a name="l00596"></a><span class="lineno"> 596</span>  <span class="keywordflow">if</span> (seglen & 1) {</div>
<div class="line"><a name="l00597"></a><span class="lineno"> 597</span>  chksum_swapped = 1;</div>
<div class="line"><a name="l00598"></a><span class="lineno"> 598</span>  chksum = <a class="code" href="../../d2/d45/inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a>(chksum);</div>
<div class="line"><a name="l00599"></a><span class="lineno"> 599</span>  }</div>
<div class="line"><a name="l00600"></a><span class="lineno"> 600</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CHECKSUM_ON_COPY */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00601"></a><span class="lineno"> 601</span>  <span class="comment">/* reference the non-volatile payload data */</span></div>
<div class="line"><a name="l00602"></a><span class="lineno"> 602</span>  ((<span class="keyword">struct </span><a class="code" href="../../df/d33/structpbuf__rom.html">pbuf_rom</a>*)p2)->payload = (<span class="keyword">const</span> <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a>*)arg + pos;</div>
<div class="line"><a name="l00603"></a><span class="lineno"> 603</span>  </div>
<div class="line"><a name="l00604"></a><span class="lineno"> 604</span>  <span class="comment">/* Second, allocate a pbuf for the headers. */</span></div>
<div class="line"><a name="l00605"></a><span class="lineno"> 605</span>  <span class="keywordflow">if</span> ((p = <a class="code" href="../../d7/d05/group__pbuf.html#gacfcb0a2af918658ba0afe36499c65f47">pbuf_alloc</a>(<a class="code" href="../../d7/d05/group__pbuf.html#ggaee1baa59bb2f85ba575b5a8619ac1ebfa2ded3594a3977f8bf9cf09552be327b5">PBUF_TRANSPORT</a>, optlen, <a class="code" href="../../d7/d05/group__pbuf.html#ggab7e0e32fcc292c0d7107721766ed92fbac5e9f28455bca98944a030d4b84ecfab">PBUF_RAM</a>)) == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00606"></a><span class="lineno"> 606</span>  <span class="comment">/* If allocation fails, we have to deallocate the data pbuf as</span></div>
<div class="line"><a name="l00607"></a><span class="lineno"> 607</span> <span class="comment"> * well. */</span></div>
<div class="line"><a name="l00608"></a><span class="lineno"> 608</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(p2);</div>
<div class="line"><a name="l00609"></a><span class="lineno"> 609</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#ga0269bdc51f1e8a5ecf9af72c6e1c996c">LWIP_DBG_LEVEL_SERIOUS</a>, (<span class="stringliteral">"tcp_write: could not allocate memory for header pbuf\n"</span>));</div>
<div class="line"><a name="l00610"></a><span class="lineno"> 610</span>  <span class="keywordflow">goto</span> memerr;</div>
<div class="line"><a name="l00611"></a><span class="lineno"> 611</span>  }</div>
<div class="line"><a name="l00612"></a><span class="lineno"> 612</span>  <span class="comment">/* Concatenate the headers and data pbufs together. */</span></div>
<div class="line"><a name="l00613"></a><span class="lineno"> 613</span>  <a class="code" href="../../d7/d05/group__pbuf.html#ga82429084fe29015509c9b4a072707cd4">pbuf_cat</a>(p<span class="comment">/*header*/</span>, p2<span class="comment">/*data*/</span>);</div>
<div class="line"><a name="l00614"></a><span class="lineno"> 614</span>  }</div>
<div class="line"><a name="l00615"></a><span class="lineno"> 615</span>  </div>
<div class="line"><a name="l00616"></a><span class="lineno"> 616</span>  queuelen += <a class="code" href="../../d0/d35/pbuf_8h.html#a5df7ac5ae59012fe9aeddba375a72190">pbuf_clen</a>(p);</div>
<div class="line"><a name="l00617"></a><span class="lineno"> 617</span>  </div>
<div class="line"><a name="l00618"></a><span class="lineno"> 618</span>  <span class="comment">/* Now that there are more segments queued, we check again if the</span></div>
<div class="line"><a name="l00619"></a><span class="lineno"> 619</span> <span class="comment"> * length of the queue exceeds the configured maximum or</span></div>
<div class="line"><a name="l00620"></a><span class="lineno"> 620</span> <span class="comment"> * overflows. */</span></div>
<div class="line"><a name="l00621"></a><span class="lineno"> 621</span>  <span class="keywordflow">if</span> ((queuelen > <a class="code" href="../../d2/d78/lwipopts_8h.html#a9beaa47832ead4180981bfbf71074904">TCP_SND_QUEUELEN</a>) || (queuelen > TCP_SNDQUEUELEN_OVERFLOW)) {</div>
<div class="line"><a name="l00622"></a><span class="lineno"> 622</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#ga0269bdc51f1e8a5ecf9af72c6e1c996c">LWIP_DBG_LEVEL_SERIOUS</a>, (<span class="stringliteral">"tcp_write: queue too long %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" (%d)\n"</span>,</div>
<div class="line"><a name="l00623"></a><span class="lineno"> 623</span>  queuelen, (<span class="keywordtype">int</span>)<a class="code" href="../../d2/d78/lwipopts_8h.html#a9beaa47832ead4180981bfbf71074904">TCP_SND_QUEUELEN</a>));</div>
<div class="line"><a name="l00624"></a><span class="lineno"> 624</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(p);</div>
<div class="line"><a name="l00625"></a><span class="lineno"> 625</span>  <span class="keywordflow">goto</span> memerr;</div>
<div class="line"><a name="l00626"></a><span class="lineno"> 626</span>  }</div>
<div class="line"><a name="l00627"></a><span class="lineno"> 627</span>  </div>
<div class="line"><a name="l00628"></a><span class="lineno"> 628</span>  <span class="keywordflow">if</span> ((seg = tcp_create_segment(pcb, p, 0, pcb->snd_lbb + pos, optflags)) == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00629"></a><span class="lineno"> 629</span>  <span class="keywordflow">goto</span> memerr;</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="preprocessor">#if TCP_OVERSIZE_DBGCHECK</span></div>
<div class="line"><a name="l00632"></a><span class="lineno"> 632</span>  seg->oversize_left = oversize;</div>
<div class="line"><a name="l00633"></a><span class="lineno"> 633</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE_DBGCHECK */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00634"></a><span class="lineno"> 634</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY</span></div>
<div class="line"><a name="l00635"></a><span class="lineno"> 635</span>  seg->chksum = chksum;</div>
<div class="line"><a name="l00636"></a><span class="lineno"> 636</span>  seg->chksum_swapped = chksum_swapped;</div>
<div class="line"><a name="l00637"></a><span class="lineno"> 637</span>  seg->flags |= TF_SEG_DATA_CHECKSUMMED;</div>
<div class="line"><a name="l00638"></a><span class="lineno"> 638</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CHECKSUM_ON_COPY */</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>  <span class="comment">/* first segment of to-be-queued data? */</span></div>
<div class="line"><a name="l00641"></a><span class="lineno"> 641</span>  <span class="keywordflow">if</span> (queue == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00642"></a><span class="lineno"> 642</span>  queue = seg;</div>
<div class="line"><a name="l00643"></a><span class="lineno"> 643</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00644"></a><span class="lineno"> 644</span>  <span class="comment">/* Attach the segment to the end of the queued segments */</span></div>
<div class="line"><a name="l00645"></a><span class="lineno"> 645</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"prev_seg != NULL"</span>, prev_seg != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);</div>
<div class="line"><a name="l00646"></a><span class="lineno"> 646</span>  prev_seg->next = seg;</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>  <span class="comment">/* remember last segment of to-be-queued data for next iteration */</span></div>
<div class="line"><a name="l00649"></a><span class="lineno"> 649</span>  prev_seg = seg;</div>
<div class="line"><a name="l00650"></a><span class="lineno"> 650</span>  </div>
<div class="line"><a name="l00651"></a><span class="lineno"> 651</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#ga988147559b78642ac881815b66023646">LWIP_DBG_TRACE</a>, (<span class="stringliteral">"tcp_write: queueing %"</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="l00652"></a><span class="lineno"> 652</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno),</div>
<div class="line"><a name="l00653"></a><span class="lineno"> 653</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno) + TCP_TCPLEN(seg)));</div>
<div class="line"><a name="l00654"></a><span class="lineno"> 654</span>  </div>
<div class="line"><a name="l00655"></a><span class="lineno"> 655</span>  pos += seglen;</div>
<div class="line"><a name="l00656"></a><span class="lineno"> 656</span>  }</div>
<div class="line"><a name="l00657"></a><span class="lineno"> 657</span>  </div>
<div class="line"><a name="l00658"></a><span class="lineno"> 658</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00659"></a><span class="lineno"> 659</span> <span class="comment"> * All three segmentation phases were successful. We can commit the</span></div>
<div class="line"><a name="l00660"></a><span class="lineno"> 660</span> <span class="comment"> * transaction.</span></div>
<div class="line"><a name="l00661"></a><span class="lineno"> 661</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00662"></a><span class="lineno"> 662</span> <span class="preprocessor">#if TCP_OVERSIZE_DBGCHECK</span></div>
<div class="line"><a name="l00663"></a><span class="lineno"> 663</span>  <span class="keywordflow">if</span> ((last_unsent != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) && (oversize_add != 0)) {</div>
<div class="line"><a name="l00664"></a><span class="lineno"> 664</span>  last_unsent->oversize_left += oversize_add;</div>
<div class="line"><a name="l00665"></a><span class="lineno"> 665</span>  }</div>
<div class="line"><a name="l00666"></a><span class="lineno"> 666</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE_DBGCHECK */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00667"></a><span class="lineno"> 667</span>  </div>
<div class="line"><a name="l00668"></a><span class="lineno"> 668</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00669"></a><span class="lineno"> 669</span> <span class="comment"> * Phase 1: If data has been added to the preallocated tail of</span></div>
<div class="line"><a name="l00670"></a><span class="lineno"> 670</span> <span class="comment"> * last_unsent, we update the length fields of the pbuf chain.</span></div>
<div class="line"><a name="l00671"></a><span class="lineno"> 671</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00672"></a><span class="lineno"> 672</span> <span class="preprocessor">#if TCP_OVERSIZE</span></div>
<div class="line"><a name="l00673"></a><span class="lineno"> 673</span>  <span class="keywordflow">if</span> (oversize_used > 0) {</div>
<div class="line"><a name="l00674"></a><span class="lineno"> 674</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p;</div>
<div class="line"><a name="l00675"></a><span class="lineno"> 675</span>  <span class="comment">/* Bump tot_len of whole chain, len of tail */</span></div>
<div class="line"><a name="l00676"></a><span class="lineno"> 676</span>  <span class="keywordflow">for</span> (p = last_unsent->p; p; p = p-><a class="code" href="../../d9/db8/structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>) {</div>
<div class="line"><a name="l00677"></a><span class="lineno"> 677</span>  p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a> += oversize_used;</div>
<div class="line"><a name="l00678"></a><span class="lineno"> 678</span>  <span class="keywordflow">if</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="l00679"></a><span class="lineno"> 679</span>  TCP_DATA_COPY((<span class="keywordtype">char</span> *)p-><a class="code" href="../../d9/db8/structpbuf.html#a8d32dc3e964369d4eec638fc37fbc460">payload</a> + p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>, arg, oversize_used, last_unsent);</div>
<div class="line"><a name="l00680"></a><span class="lineno"> 680</span>  p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> += oversize_used;</div>
<div class="line"><a name="l00681"></a><span class="lineno"> 681</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>  last_unsent->len += oversize_used;</div>
<div class="line"><a name="l00684"></a><span class="lineno"> 684</span> <span class="preprocessor">#if TCP_OVERSIZE_DBGCHECK</span></div>
<div class="line"><a name="l00685"></a><span class="lineno"> 685</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"last_unsent->oversize_left >= oversize_used"</span>,</div>
<div class="line"><a name="l00686"></a><span class="lineno"> 686</span>  last_unsent->oversize_left >= oversize_used);</div>
<div class="line"><a name="l00687"></a><span class="lineno"> 687</span>  last_unsent->oversize_left -= oversize_used;</div>
<div class="line"><a name="l00688"></a><span class="lineno"> 688</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE_DBGCHECK */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00689"></a><span class="lineno"> 689</span>  }</div>
<div class="line"><a name="l00690"></a><span class="lineno"> 690</span>  pcb->unsent_oversize = oversize;</div>
<div class="line"><a name="l00691"></a><span class="lineno"> 691</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00692"></a><span class="lineno"> 692</span>  </div>
<div class="line"><a name="l00693"></a><span class="lineno"> 693</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00694"></a><span class="lineno"> 694</span> <span class="comment"> * Phase 2: concat_p can be concatenated onto last_unsent->p, unless we</span></div>
<div class="line"><a name="l00695"></a><span class="lineno"> 695</span> <span class="comment"> * determined that the last ROM pbuf can be extended to include the new data.</span></div>
<div class="line"><a name="l00696"></a><span class="lineno"> 696</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00697"></a><span class="lineno"> 697</span>  <span class="keywordflow">if</span> (concat_p != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00698"></a><span class="lineno"> 698</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_write: cannot concatenate when pcb->unsent is empty"</span>,</div>
<div class="line"><a name="l00699"></a><span class="lineno"> 699</span>  (last_unsent != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>));</div>
<div class="line"><a name="l00700"></a><span class="lineno"> 700</span>  <a class="code" href="../../d7/d05/group__pbuf.html#ga82429084fe29015509c9b4a072707cd4">pbuf_cat</a>(last_unsent->p, concat_p);</div>
<div class="line"><a name="l00701"></a><span class="lineno"> 701</span>  last_unsent->len += concat_p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a>;</div>
<div class="line"><a name="l00702"></a><span class="lineno"> 702</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (extendlen > 0) {</div>
<div class="line"><a name="l00703"></a><span class="lineno"> 703</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p;</div>
<div class="line"><a name="l00704"></a><span class="lineno"> 704</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_write: extension of reference requires reference"</span>,</div>
<div class="line"><a name="l00705"></a><span class="lineno"> 705</span>  last_unsent != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> && last_unsent->p != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);</div>
<div class="line"><a name="l00706"></a><span class="lineno"> 706</span>  <span class="keywordflow">for</span> (p = last_unsent->p; 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>; p = p-><a class="code" href="../../d9/db8/structpbuf.html#a5e5763c94fd18d78937b0b58ce7df341">next</a>) {</div>
<div class="line"><a name="l00707"></a><span class="lineno"> 707</span>  p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a> += extendlen;</div>
<div class="line"><a name="l00708"></a><span class="lineno"> 708</span>  }</div>
<div class="line"><a name="l00709"></a><span class="lineno"> 709</span>  p-><a class="code" href="../../d9/db8/structpbuf.html#a5259e7ec29bab9c0999b64f2e86b411f">tot_len</a> += extendlen;</div>
<div class="line"><a name="l00710"></a><span class="lineno"> 710</span>  p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> += extendlen;</div>
<div class="line"><a name="l00711"></a><span class="lineno"> 711</span>  last_unsent->len += extendlen;</div>
<div class="line"><a name="l00712"></a><span class="lineno"> 712</span>  }</div>
<div class="line"><a name="l00713"></a><span class="lineno"> 713</span>  </div>
<div class="line"><a name="l00714"></a><span class="lineno"> 714</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY</span></div>
<div class="line"><a name="l00715"></a><span class="lineno"> 715</span>  <span class="keywordflow">if</span> (concat_chksummed) {</div>
<div class="line"><a name="l00716"></a><span class="lineno"> 716</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_write: concat checksum needs concatenated data"</span>,</div>
<div class="line"><a name="l00717"></a><span class="lineno"> 717</span>  concat_p != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> || extendlen > 0);</div>
<div class="line"><a name="l00718"></a><span class="lineno"> 718</span>  <span class="comment">/*if concat checksumm swapped - swap it back */</span></div>
<div class="line"><a name="l00719"></a><span class="lineno"> 719</span>  <span class="keywordflow">if</span> (concat_chksum_swapped) {</div>
<div class="line"><a name="l00720"></a><span class="lineno"> 720</span>  concat_chksum = <a class="code" href="../../d2/d45/inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a>(concat_chksum);</div>
<div class="line"><a name="l00721"></a><span class="lineno"> 721</span>  }</div>
<div class="line"><a name="l00722"></a><span class="lineno"> 722</span>  tcp_seg_add_chksum(concat_chksum, concat_chksummed, &last_unsent->chksum,</div>
<div class="line"><a name="l00723"></a><span class="lineno"> 723</span>  &last_unsent->chksum_swapped);</div>
<div class="line"><a name="l00724"></a><span class="lineno"> 724</span>  last_unsent->flags |= TF_SEG_DATA_CHECKSUMMED;</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="preprocessor">#endif </span><span class="comment">/* TCP_CHECKSUM_ON_COPY */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00727"></a><span class="lineno"> 727</span>  </div>
<div class="line"><a name="l00728"></a><span class="lineno"> 728</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00729"></a><span class="lineno"> 729</span> <span class="comment"> * Phase 3: Append queue to pcb->unsent. Queue may be NULL, but that</span></div>
<div class="line"><a name="l00730"></a><span class="lineno"> 730</span> <span class="comment"> * is harmless</span></div>
<div class="line"><a name="l00731"></a><span class="lineno"> 731</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00732"></a><span class="lineno"> 732</span>  <span class="keywordflow">if</span> (last_unsent == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00733"></a><span class="lineno"> 733</span>  pcb->unsent = queue;</div>
<div class="line"><a name="l00734"></a><span class="lineno"> 734</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00735"></a><span class="lineno"> 735</span>  last_unsent->next = queue;</div>
<div class="line"><a name="l00736"></a><span class="lineno"> 736</span>  }</div>
<div class="line"><a name="l00737"></a><span class="lineno"> 737</span>  </div>
<div class="line"><a name="l00738"></a><span class="lineno"> 738</span>  <span class="comment">/*</span></div>
<div class="line"><a name="l00739"></a><span class="lineno"> 739</span> <span class="comment"> * Finally update the pcb state.</span></div>
<div class="line"><a name="l00740"></a><span class="lineno"> 740</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00741"></a><span class="lineno"> 741</span>  pcb->snd_lbb += <a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>;</div>
<div class="line"><a name="l00742"></a><span class="lineno"> 742</span>  pcb->snd_buf -= <a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a>;</div>
<div class="line"><a name="l00743"></a><span class="lineno"> 743</span>  pcb->snd_queuelen = queuelen;</div>
<div class="line"><a name="l00744"></a><span class="lineno"> 744</span>  </div>
<div class="line"><a name="l00745"></a><span class="lineno"> 745</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_write: %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gac05a82d37afb251470f5e17ca15ab6e9">S16_F</a><span class="stringliteral">" (after enqueued)\n"</span>,</div>
<div class="line"><a name="l00746"></a><span class="lineno"> 746</span>  pcb->snd_queuelen));</div>
<div class="line"><a name="l00747"></a><span class="lineno"> 747</span>  <span class="keywordflow">if</span> (pcb->snd_queuelen != 0) {</div>
<div class="line"><a name="l00748"></a><span class="lineno"> 748</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_write: valid queue length"</span>,</div>
<div class="line"><a name="l00749"></a><span class="lineno"> 749</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="l00750"></a><span class="lineno"> 750</span>  }</div>
<div class="line"><a name="l00751"></a><span class="lineno"> 751</span>  </div>
<div class="line"><a name="l00752"></a><span class="lineno"> 752</span>  <span class="comment">/* Set the PSH flag in the last segment that we enqueued. */</span></div>
<div class="line"><a name="l00753"></a><span class="lineno"> 753</span>  <span class="keywordflow">if</span> (seg != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> && seg->tcphdr != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> && ((apiflags & TCP_WRITE_FLAG_MORE)==0)) {</div>
<div class="line"><a name="l00754"></a><span class="lineno"> 754</span>  <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a42432f2dde6716ecb0087ccbc47cc75b">TCPH_SET_FLAG</a>(seg->tcphdr, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a1320fd0006a2f70138bc2d0018dda829">TCP_PSH</a>);</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>  </div>
<div class="line"><a name="l00757"></a><span class="lineno"> 757</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="l00758"></a><span class="lineno"> 758</span> memerr:</div>
<div class="line"><a name="l00759"></a><span class="lineno"> 759</span>  pcb->flags |= TF_NAGLEMEMERR;</div>
<div class="line"><a name="l00760"></a><span class="lineno"> 760</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.memerr);</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> (concat_p != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00763"></a><span class="lineno"> 763</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(concat_p);</div>
<div class="line"><a name="l00764"></a><span class="lineno"> 764</span>  }</div>
<div class="line"><a name="l00765"></a><span class="lineno"> 765</span>  <span class="keywordflow">if</span> (queue != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00766"></a><span class="lineno"> 766</span>  tcp_segs_free(queue);</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>  <span class="keywordflow">if</span> (pcb->snd_queuelen != 0) {</div>
<div class="line"><a name="l00769"></a><span class="lineno"> 769</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_write: 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="l00770"></a><span class="lineno"> 770</span>  pcb->unsent != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);</div>
<div class="line"><a name="l00771"></a><span class="lineno"> 771</span>  }</div>
<div class="line"><a name="l00772"></a><span class="lineno"> 772</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> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#ga511ee3deb3240635f5ec6a1709c6d741">LWIP_DBG_STATE</a>, (<span class="stringliteral">"tcp_write: %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gac05a82d37afb251470f5e17ca15ab6e9">S16_F</a><span class="stringliteral">" (with mem err)\n"</span>, pcb->snd_queuelen));</div>
<div class="line"><a name="l00773"></a><span class="lineno"> 773</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaaaeafdbf3aecc46864daa3cd829c7e05">ERR_MEM</a>;</div>
<div class="line"><a name="l00774"></a><span class="lineno"> 774</span> }</div>
<div class="line"><a name="l00775"></a><span class="lineno"> 775</span>  </div>
<div class="line"><a name="l00784"></a><span class="lineno"> 784</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a></div>
<div class="line"><a name="l00785"></a><span class="lineno"> 785</span> tcp_enqueue_flags(<span class="keyword">struct</span> tcp_pcb *pcb, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> <a class="code" href="../../d9/db8/structpbuf.html#aa4d1af2cab3d9280d29212095b5b872a">flags</a>)</div>
<div class="line"><a name="l00786"></a><span class="lineno"> 786</span> {</div>
<div class="line"><a name="l00787"></a><span class="lineno"> 787</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p;</div>
<div class="line"><a name="l00788"></a><span class="lineno"> 788</span>  <span class="keyword">struct </span>tcp_seg *seg;</div>
<div class="line"><a name="l00789"></a><span class="lineno"> 789</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> optflags = 0;</div>
<div class="line"><a name="l00790"></a><span class="lineno"> 790</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> optlen = 0;</div>
<div class="line"><a name="l00791"></a><span class="lineno"> 791</span>  </div>
<div class="line"><a name="l00792"></a><span class="lineno"> 792</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_enqueue_flags: queuelen: %"</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>)pcb->snd_queuelen));</div>
<div class="line"><a name="l00793"></a><span class="lineno"> 793</span>  </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">"tcp_enqueue_flags: need either TCP_SYN or TCP_FIN in flags (programmer violates API)"</span>,</div>
<div class="line"><a name="l00795"></a><span class="lineno"> 795</span>  (flags & (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a> | <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>)) != 0);</div>
<div class="line"><a name="l00796"></a><span class="lineno"> 796</span>  </div>
<div class="line"><a name="l00797"></a><span class="lineno"> 797</span>  <span class="comment">/* check for configured max queuelen and possible overflow (FIN flag should always come through!) */</span></div>
<div class="line"><a name="l00798"></a><span class="lineno"> 798</span>  <span class="keywordflow">if</span> (((pcb->snd_queuelen >= <a class="code" href="../../d2/d78/lwipopts_8h.html#a9beaa47832ead4180981bfbf71074904">TCP_SND_QUEUELEN</a>) || (pcb->snd_queuelen > TCP_SNDQUEUELEN_OVERFLOW)) &&</div>
<div class="line"><a name="l00799"></a><span class="lineno"> 799</span>  ((flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) == 0)) {</div>
<div class="line"><a name="l00800"></a><span class="lineno"> 800</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#gaab41143277cd38047b6660d90e9cec3b">LWIP_DBG_LEVEL_SEVERE</a>, (<span class="stringliteral">"tcp_enqueue_flags: too long queue %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">" (max %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">")\n"</span>,</div>
<div class="line"><a name="l00801"></a><span class="lineno"> 801</span>  pcb->snd_queuelen, (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)<a class="code" href="../../d2/d78/lwipopts_8h.html#a9beaa47832ead4180981bfbf71074904">TCP_SND_QUEUELEN</a>));</div>
<div class="line"><a name="l00802"></a><span class="lineno"> 802</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.memerr);</div>
<div class="line"><a name="l00803"></a><span class="lineno"> 803</span>  pcb->flags |= TF_NAGLEMEMERR;</div>
<div class="line"><a name="l00804"></a><span class="lineno"> 804</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaaaeafdbf3aecc46864daa3cd829c7e05">ERR_MEM</a>;</div>
<div class="line"><a name="l00805"></a><span class="lineno"> 805</span>  }</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>  <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="l00808"></a><span class="lineno"> 808</span>  optflags = TF_SEG_OPTS_MSS;</div>
<div class="line"><a name="l00809"></a><span class="lineno"> 809</span> <span class="preprocessor">#if LWIP_WND_SCALE</span></div>
<div class="line"><a name="l00810"></a><span class="lineno"> 810</span>  <span class="keywordflow">if</span> ((pcb->state != SYN_RCVD) || (pcb->flags & TF_WND_SCALE)) {</div>
<div class="line"><a name="l00811"></a><span class="lineno"> 811</span>  <span class="comment">/* In a <SYN,ACK> (sent in state SYN_RCVD), the window scale option may only</span></div>
<div class="line"><a name="l00812"></a><span class="lineno"> 812</span> <span class="comment"> be sent if we received a window scale option from the remote host. */</span></div>
<div class="line"><a name="l00813"></a><span class="lineno"> 813</span>  optflags |= TF_SEG_OPTS_WND_SCALE;</div>
<div class="line"><a name="l00814"></a><span class="lineno"> 814</span>  }</div>
<div class="line"><a name="l00815"></a><span class="lineno"> 815</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_WND_SCALE */</span><span class="preprocessor"></span></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> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS</span></div>
<div class="line"><a name="l00818"></a><span class="lineno"> 818</span>  <span class="keywordflow">if</span> ((pcb->flags & TF_TIMESTAMP)) {</div>
<div class="line"><a name="l00819"></a><span class="lineno"> 819</span>  <span class="comment">/* Make sure the timestamp option is only included in data segments if we</span></div>
<div class="line"><a name="l00820"></a><span class="lineno"> 820</span> <span class="comment"> agreed about it with the remote host. */</span></div>
<div class="line"><a name="l00821"></a><span class="lineno"> 821</span>  optflags |= TF_SEG_OPTS_TS;</div>
<div class="line"><a name="l00822"></a><span class="lineno"> 822</span>  }</div>
<div class="line"><a name="l00823"></a><span class="lineno"> 823</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_TCP_TIMESTAMPS */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00824"></a><span class="lineno"> 824</span>  optlen = LWIP_TCP_OPT_LENGTH(optflags);</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">/* Allocate pbuf with room for TCP header + options */</span></div>
<div class="line"><a name="l00827"></a><span class="lineno"> 827</span>  <span class="keywordflow">if</span> ((p = <a class="code" href="../../d7/d05/group__pbuf.html#gacfcb0a2af918658ba0afe36499c65f47">pbuf_alloc</a>(<a class="code" href="../../d7/d05/group__pbuf.html#ggaee1baa59bb2f85ba575b5a8619ac1ebfa2ded3594a3977f8bf9cf09552be327b5">PBUF_TRANSPORT</a>, optlen, <a class="code" href="../../d7/d05/group__pbuf.html#ggab7e0e32fcc292c0d7107721766ed92fbac5e9f28455bca98944a030d4b84ecfab">PBUF_RAM</a>)) == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00828"></a><span class="lineno"> 828</span>  pcb->flags |= TF_NAGLEMEMERR;</div>
<div class="line"><a name="l00829"></a><span class="lineno"> 829</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.memerr);</div>
<div class="line"><a name="l00830"></a><span class="lineno"> 830</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaaaeafdbf3aecc46864daa3cd829c7e05">ERR_MEM</a>;</div>
<div class="line"><a name="l00831"></a><span class="lineno"> 831</span>  }</div>
<div class="line"><a name="l00832"></a><span class="lineno"> 832</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_enqueue_flags: check that first pbuf can hold optlen"</span>,</div>
<div class="line"><a name="l00833"></a><span class="lineno"> 833</span>  (p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> >= optlen));</div>
<div class="line"><a name="l00834"></a><span class="lineno"> 834</span>  </div>
<div class="line"><a name="l00835"></a><span class="lineno"> 835</span>  <span class="comment">/* Allocate memory for tcp_seg, and fill in fields. */</span></div>
<div class="line"><a name="l00836"></a><span class="lineno"> 836</span>  <span class="keywordflow">if</span> ((seg = tcp_create_segment(pcb, p, flags, pcb->snd_lbb, optflags)) == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00837"></a><span class="lineno"> 837</span>  pcb->flags |= TF_NAGLEMEMERR;</div>
<div class="line"><a name="l00838"></a><span class="lineno"> 838</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.memerr);</div>
<div class="line"><a name="l00839"></a><span class="lineno"> 839</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaaaeafdbf3aecc46864daa3cd829c7e05">ERR_MEM</a>;</div>
<div class="line"><a name="l00840"></a><span class="lineno"> 840</span>  }</div>
<div class="line"><a name="l00841"></a><span class="lineno"> 841</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"seg->tcphdr not aligned"</span>, ((<a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaf019cbb71af10dcfda7758b21e655307">mem_ptr_t</a>)seg->tcphdr % <a class="code" href="../../d4/da4/def_8h.html#a748f5df614a3fc989e8900fd229d6e4e">LWIP_MIN</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a97343214666ee6dcb18c0bd77b441ea7">MEM_ALIGNMENT</a>, 4)) == 0);</div>
<div class="line"><a name="l00842"></a><span class="lineno"> 842</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_enqueue_flags: invalid segment length"</span>, seg->len == 0);</div>
<div class="line"><a name="l00843"></a><span class="lineno"> 843</span>  </div>
<div class="line"><a name="l00844"></a><span class="lineno"> 844</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a> | <a class="code" href="../../d6/d7a/group__debugging__levels.html#ga988147559b78642ac881815b66023646">LWIP_DBG_TRACE</a>,</div>
<div class="line"><a name="l00845"></a><span class="lineno"> 845</span>  (<span class="stringliteral">"tcp_enqueue_flags: queueing %"</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">" (0x%"</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="l00846"></a><span class="lineno"> 846</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno),</div>
<div class="line"><a name="l00847"></a><span class="lineno"> 847</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno) + TCP_TCPLEN(seg),</div>
<div class="line"><a name="l00848"></a><span class="lineno"> 848</span>  (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)flags));</div>
<div class="line"><a name="l00849"></a><span class="lineno"> 849</span>  </div>
<div class="line"><a name="l00850"></a><span class="lineno"> 850</span>  <span class="comment">/* Now append seg to pcb->unsent queue */</span></div>
<div class="line"><a name="l00851"></a><span class="lineno"> 851</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="l00852"></a><span class="lineno"> 852</span>  pcb->unsent = seg;</div>
<div class="line"><a name="l00853"></a><span class="lineno"> 853</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00854"></a><span class="lineno"> 854</span>  <span class="keyword">struct </span>tcp_seg *useg;</div>
<div class="line"><a name="l00855"></a><span class="lineno"> 855</span>  <span class="keywordflow">for</span> (useg = pcb->unsent; useg->next != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>; useg = useg->next);</div>
<div class="line"><a name="l00856"></a><span class="lineno"> 856</span>  useg->next = seg;</div>
<div class="line"><a name="l00857"></a><span class="lineno"> 857</span>  }</div>
<div class="line"><a name="l00858"></a><span class="lineno"> 858</span> <span class="preprocessor">#if TCP_OVERSIZE</span></div>
<div class="line"><a name="l00859"></a><span class="lineno"> 859</span>  <span class="comment">/* The new unsent tail has no space */</span></div>
<div class="line"><a name="l00860"></a><span class="lineno"> 860</span>  pcb->unsent_oversize = 0;</div>
<div class="line"><a name="l00861"></a><span class="lineno"> 861</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00862"></a><span class="lineno"> 862</span>  </div>
<div class="line"><a name="l00863"></a><span class="lineno"> 863</span>  <span class="comment">/* SYN and FIN bump the sequence number */</span></div>
<div class="line"><a name="l00864"></a><span class="lineno"> 864</span>  <span class="keywordflow">if</span> ((flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83">TCP_SYN</a>) || (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>)) {</div>
<div class="line"><a name="l00865"></a><span class="lineno"> 865</span>  pcb->snd_lbb++;</div>
<div class="line"><a name="l00866"></a><span class="lineno"> 866</span>  <span class="comment">/* optlen does not influence snd_buf */</span></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">if</span> (flags & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) {</div>
<div class="line"><a name="l00869"></a><span class="lineno"> 869</span>  pcb->flags |= TF_FIN;</div>
<div class="line"><a name="l00870"></a><span class="lineno"> 870</span>  }</div>
<div class="line"><a name="l00871"></a><span class="lineno"> 871</span>  </div>
<div class="line"><a name="l00872"></a><span class="lineno"> 872</span>  <span class="comment">/* update number of segments on the queues */</span></div>
<div class="line"><a name="l00873"></a><span class="lineno"> 873</span>  pcb->snd_queuelen += <a class="code" href="../../d0/d35/pbuf_8h.html#a5df7ac5ae59012fe9aeddba375a72190">pbuf_clen</a>(seg->p);</div>
<div class="line"><a name="l00874"></a><span class="lineno"> 874</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_enqueue_flags: %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gac05a82d37afb251470f5e17ca15ab6e9">S16_F</a><span class="stringliteral">" (after enqueued)\n"</span>, pcb->snd_queuelen));</div>
<div class="line"><a name="l00875"></a><span class="lineno"> 875</span>  <span class="keywordflow">if</span> (pcb->snd_queuelen != 0) {</div>
<div class="line"><a name="l00876"></a><span class="lineno"> 876</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"tcp_enqueue_flags: invalid queue length"</span>,</div>
<div class="line"><a name="l00877"></a><span class="lineno"> 877</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="l00878"></a><span class="lineno"> 878</span>  }</div>
<div class="line"><a name="l00879"></a><span class="lineno"> 879</span>  </div>
<div class="line"><a name="l00880"></a><span class="lineno"> 880</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="l00881"></a><span class="lineno"> 881</span> }</div>
<div class="line"><a name="l00882"></a><span class="lineno"> 882</span>  </div>
<div class="line"><a name="l00883"></a><span class="lineno"> 883</span> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS</span></div>
<div class="line"><a name="l00884"></a><span class="lineno"> 884</span> <span class="comment">/* Build a timestamp option (12 bytes long) at the specified options pointer)</span></div>
<div class="line"><a name="l00885"></a><span class="lineno"> 885</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00886"></a><span class="lineno"> 886</span> <span class="comment"> * @param pcb tcp_pcb</span></div>
<div class="line"><a name="l00887"></a><span class="lineno"> 887</span> <span class="comment"> * @param opts option pointer where to store the timestamp option</span></div>
<div class="line"><a name="l00888"></a><span class="lineno"> 888</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00889"></a><span class="lineno"> 889</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00890"></a><span class="lineno"> 890</span> tcp_build_timestamp_option(<span class="keyword">struct</span> tcp_pcb *pcb, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> *opts)</div>
<div class="line"><a name="l00891"></a><span class="lineno"> 891</span> {</div>
<div class="line"><a name="l00892"></a><span class="lineno"> 892</span>  <span class="comment">/* Pad with two NOP options to make everything nicely aligned */</span></div>
<div class="line"><a name="l00893"></a><span class="lineno"> 893</span>  opts[0] = <a class="code" href="../../d4/da4/def_8h.html#afea9c21aa1f56180cdf6fb42ef14a294">PP_HTONL</a>(0x0101080A);</div>
<div class="line"><a name="l00894"></a><span class="lineno"> 894</span>  opts[1] = <a class="code" href="../../d2/d6e/def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(<a class="code" href="../../d3/dc4/group__sys__time.html#ga11316ac1e77418c6fa4ab8869e3fa199">sys_now</a>());</div>
<div class="line"><a name="l00895"></a><span class="lineno"> 895</span>  opts[2] = <a class="code" href="../../d2/d6e/def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(pcb->ts_recent);</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="preprocessor">#endif</span></div>
<div class="line"><a name="l00898"></a><span class="lineno"> 898</span>  </div>
<div class="line"><a name="l00899"></a><span class="lineno"> 899</span> <span class="preprocessor">#if LWIP_WND_SCALE</span></div>
<div class="line"><a name="l00900"></a><span class="lineno"> 900</span>  </div>
<div class="line"><a name="l00904"></a><span class="lineno"> 904</span> <span class="keyword">static</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l00905"></a><span class="lineno"> 905</span> tcp_build_wnd_scale_option(<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> *opts)</div>
<div class="line"><a name="l00906"></a><span class="lineno"> 906</span> {</div>
<div class="line"><a name="l00907"></a><span class="lineno"> 907</span>  <span class="comment">/* Pad with one NOP option to make everything nicely aligned */</span></div>
<div class="line"><a name="l00908"></a><span class="lineno"> 908</span>  opts[0] = <a class="code" href="../../d4/da4/def_8h.html#afea9c21aa1f56180cdf6fb42ef14a294">PP_HTONL</a>(0x01030300 | <a class="code" href="../../dd/da6/group__lwip__opts__tcp.html#ga768765a2c678fefeca6c89aae0cf629f">TCP_RCV_SCALE</a>);</div>
<div class="line"><a name="l00909"></a><span class="lineno"> 909</span> }</div>
<div class="line"><a name="l00910"></a><span class="lineno"> 910</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00911"></a><span class="lineno"> 911</span>  </div>
<div class="line"><a name="l00917"></a><span class="lineno"> 917</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a></div>
<div class="line"><a name="l00918"></a><span class="lineno"> 918</span> tcp_send_empty_ack(<span class="keyword">struct</span> tcp_pcb *pcb)</div>
<div class="line"><a name="l00919"></a><span class="lineno"> 919</span> {</div>
<div class="line"><a name="l00920"></a><span class="lineno"> 920</span>  <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err;</div>
<div class="line"><a name="l00921"></a><span class="lineno"> 921</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p;</div>
<div class="line"><a name="l00922"></a><span class="lineno"> 922</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> optlen = 0;</div>
<div class="line"><a name="l00923"></a><span class="lineno"> 923</span>  <span class="keyword">struct </span><a class="code" href="../../d2/dd6/structnetif.html">netif</a> *<a class="code" href="../../d2/dd6/structnetif.html">netif</a>;</div>
<div class="line"><a name="l00924"></a><span class="lineno"> 924</span> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS || CHECKSUM_GEN_TCP</span></div>
<div class="line"><a name="l00925"></a><span class="lineno"> 925</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="l00926"></a><span class="lineno"> 926</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_TCP_TIMESTAMPS || CHECKSUM_GEN_TCP */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00927"></a><span class="lineno"> 927</span>  </div>
<div class="line"><a name="l00928"></a><span class="lineno"> 928</span> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS</span></div>
<div class="line"><a name="l00929"></a><span class="lineno"> 929</span>  <span class="keywordflow">if</span> (pcb->flags & TF_TIMESTAMP) {</div>
<div class="line"><a name="l00930"></a><span class="lineno"> 930</span>  optlen = LWIP_TCP_OPT_LENGTH(TF_SEG_OPTS_TS);</div>
<div class="line"><a name="l00931"></a><span class="lineno"> 931</span>  }</div>
<div class="line"><a name="l00932"></a><span class="lineno"> 932</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00933"></a><span class="lineno"> 933</span>  </div>
<div class="line"><a name="l00934"></a><span class="lineno"> 934</span>  p = tcp_output_alloc_header(pcb, optlen, 0, <a class="code" href="../../d2/d6e/def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(pcb->snd_nxt));</div>
<div class="line"><a name="l00935"></a><span class="lineno"> 935</span>  <span class="keywordflow">if</span> (p == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00936"></a><span class="lineno"> 936</span>  <span class="comment">/* let tcp_fasttmr retry sending this ACK */</span></div>
<div class="line"><a name="l00937"></a><span class="lineno"> 937</span>  pcb->flags |= (TF_ACK_DELAY | TF_ACK_NOW);</div>
<div class="line"><a name="l00938"></a><span class="lineno"> 938</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a>, (<span class="stringliteral">"tcp_output: (ACK) could not allocate pbuf\n"</span>));</div>
<div class="line"><a name="l00939"></a><span class="lineno"> 939</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadca05c91366f1b5203a5db9a241b415cd63">ERR_BUF</a>;</div>
<div class="line"><a name="l00940"></a><span class="lineno"> 940</span>  }</div>
<div class="line"><a name="l00941"></a><span class="lineno"> 941</span> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS || CHECKSUM_GEN_TCP</span></div>
<div class="line"><a name="l00942"></a><span class="lineno"> 942</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="l00943"></a><span class="lineno"> 943</span> #endif <span class="comment">/* LWIP_TCP_TIMESTAMPS || CHECKSUM_GEN_TCP */</span></div>
<div class="line"><a name="l00944"></a><span class="lineno"> 944</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a>,</div>
<div class="line"><a name="l00945"></a><span class="lineno"> 945</span>  (<span class="stringliteral">"tcp_output: sending ACK for %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">"\n"</span>, pcb->rcv_nxt));</div>
<div class="line"><a name="l00946"></a><span class="lineno"> 946</span>  </div>
<div class="line"><a name="l00947"></a><span class="lineno"> 947</span>  <span class="comment">/* NB. MSS and window scale options are only sent on SYNs, so ignore them here */</span></div>
<div class="line"><a name="l00948"></a><span class="lineno"> 948</span> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS</span></div>
<div class="line"><a name="l00949"></a><span class="lineno"> 949</span>  pcb->ts_lastacksent = pcb->rcv_nxt;</div>
<div class="line"><a name="l00950"></a><span class="lineno"> 950</span>  </div>
<div class="line"><a name="l00951"></a><span class="lineno"> 951</span>  <span class="keywordflow">if</span> (pcb->flags & TF_TIMESTAMP) {</div>
<div class="line"><a name="l00952"></a><span class="lineno"> 952</span>  tcp_build_timestamp_option(pcb, (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> *)(tcphdr + 1));</div>
<div class="line"><a name="l00953"></a><span class="lineno"> 953</span>  }</div>
<div class="line"><a name="l00954"></a><span class="lineno"> 954</span> <span class="preprocessor">#endif</span></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>  <a class="code" href="../../d2/dd6/structnetif.html">netif</a> = ip_route(&pcb->local_ip, &pcb->remote_ip);</div>
<div class="line"><a name="l00957"></a><span class="lineno"> 957</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d2/dd6/structnetif.html">netif</a> == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l00958"></a><span class="lineno"> 958</span>  err = <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadca9448893187313c0c5a502ca9a9ad1c2a">ERR_RTE</a>;</div>
<div class="line"><a name="l00959"></a><span class="lineno"> 959</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00960"></a><span class="lineno"> 960</span> <span class="preprocessor">#if CHECKSUM_GEN_TCP</span></div>
<div class="line"><a name="l00961"></a><span class="lineno"> 961</span>  <a class="code" href="../../d9/d69/netif_8h.html#ad968df1b35c2fae368e087966e3bc677">IF__NETIF_CHECKSUM_ENABLED</a>(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, NETIF_CHECKSUM_GEN_TCP) {</div>
<div class="line"><a name="l00962"></a><span class="lineno"> 962</span>  tcphdr->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="l00963"></a><span class="lineno"> 963</span>  &pcb->local_ip, &pcb->remote_ip);</div>
<div class="line"><a name="l00964"></a><span class="lineno"> 964</span>  }</div>
<div class="line"><a name="l00965"></a><span class="lineno"> 965</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00966"></a><span class="lineno"> 966</span>  <a class="code" href="../../d9/d69/netif_8h.html#ae1c22f1dab74a84d9e31316fd5fdfa11">NETIF_SET_HWADDRHINT</a>(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, &(pcb->addr_hint));</div>
<div class="line"><a name="l00967"></a><span class="lineno"> 967</span>  err = ip_output_if(p, &pcb->local_ip, &pcb->remote_ip,</div>
<div class="line"><a name="l00968"></a><span class="lineno"> 968</span>  pcb->ttl, pcb->tos, <a class="code" href="../../d4/d19/prot_2ip_8h.html#a634284ee3a136d6ad61bc5d917ebb82f">IP_PROTO_TCP</a>, <a class="code" href="../../d2/dd6/structnetif.html">netif</a>);</div>
<div class="line"><a name="l00969"></a><span class="lineno"> 969</span>  <a class="code" href="../../d9/d69/netif_8h.html#ae1c22f1dab74a84d9e31316fd5fdfa11">NETIF_SET_HWADDRHINT</a>(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);</div>
<div class="line"><a name="l00970"></a><span class="lineno"> 970</span>  }</div>
<div class="line"><a name="l00971"></a><span class="lineno"> 971</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(p);</div>
<div class="line"><a name="l00972"></a><span class="lineno"> 972</span>  </div>
<div class="line"><a name="l00973"></a><span class="lineno"> 973</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="l00974"></a><span class="lineno"> 974</span>  <span class="comment">/* let tcp_fasttmr retry sending this ACK */</span></div>
<div class="line"><a name="l00975"></a><span class="lineno"> 975</span>  pcb->flags |= (TF_ACK_DELAY | TF_ACK_NOW);</div>
<div class="line"><a name="l00976"></a><span class="lineno"> 976</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00977"></a><span class="lineno"> 977</span>  <span class="comment">/* remove ACK flags from the PCB, as we sent an empty ACK now */</span></div>
<div class="line"><a name="l00978"></a><span class="lineno"> 978</span>  pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);</div>
<div class="line"><a name="l00979"></a><span class="lineno"> 979</span>  }</div>
<div class="line"><a name="l00980"></a><span class="lineno"> 980</span>  </div>
<div class="line"><a name="l00981"></a><span class="lineno"> 981</span>  <span class="keywordflow">return</span> err;</div>
<div class="line"><a name="l00982"></a><span class="lineno"> 982</span> }</div>
<div class="line"><a name="l00983"></a><span class="lineno"> 983</span>  </div>
<div class="line"><a name="l00992"></a><span class="lineno"> 992</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a></div>
<div class="line"><a name="l00993"></a><span class="lineno"> 993</span> tcp_output(<span class="keyword">struct</span> tcp_pcb *pcb)</div>
<div class="line"><a name="l00994"></a><span class="lineno"> 994</span> {</div>
<div class="line"><a name="l00995"></a><span class="lineno"> 995</span>  <span class="keyword">struct </span>tcp_seg *seg, *useg;</div>
<div class="line"><a name="l00996"></a><span class="lineno"> 996</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> wnd, snd_nxt;</div>
<div class="line"><a name="l00997"></a><span class="lineno"> 997</span>  <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err;</div>
<div class="line"><a name="l00998"></a><span class="lineno"> 998</span>  <span class="keyword">struct </span><a class="code" href="../../d2/dd6/structnetif.html">netif</a> *<a class="code" href="../../d2/dd6/structnetif.html">netif</a>;</div>
<div class="line"><a name="l00999"></a><span class="lineno"> 999</span> <span class="preprocessor">#if TCP_CWND_DEBUG</span></div>
<div class="line"><a name="l01000"></a><span class="lineno"> 1000</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#gacf46f4df0ebab84edebcb69967fdf86b">s16_t</a> i = 0;</div>
<div class="line"><a name="l01001"></a><span class="lineno"> 1001</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CWND_DEBUG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01002"></a><span class="lineno"> 1002</span>  </div>
<div class="line"><a name="l01003"></a><span class="lineno"> 1003</span>  <span class="comment">/* pcb->state LISTEN not allowed here */</span></div>
<div class="line"><a name="l01004"></a><span class="lineno"> 1004</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"don't call tcp_output for listen-pcbs"</span>,</div>
<div class="line"><a name="l01005"></a><span class="lineno"> 1005</span>  pcb->state != LISTEN);</div>
<div class="line"><a name="l01006"></a><span class="lineno"> 1006</span>  </div>
<div class="line"><a name="l01007"></a><span class="lineno"> 1007</span>  <span class="comment">/* First, check if we are invoked by the TCP input processing</span></div>
<div class="line"><a name="l01008"></a><span class="lineno"> 1008</span> <span class="comment"> code. If so, we do not output anything. Instead, we rely on the</span></div>
<div class="line"><a name="l01009"></a><span class="lineno"> 1009</span> <span class="comment"> input processing code to call us when input processing is done</span></div>
<div class="line"><a name="l01010"></a><span class="lineno"> 1010</span> <span class="comment"> with. */</span></div>
<div class="line"><a name="l01011"></a><span class="lineno"> 1011</span>  <span class="keywordflow">if</span> (tcp_input_pcb == pcb) {</div>
<div class="line"><a name="l01012"></a><span class="lineno"> 1012</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="l01013"></a><span class="lineno"> 1013</span>  }</div>
<div class="line"><a name="l01014"></a><span class="lineno"> 1014</span>  </div>
<div class="line"><a name="l01015"></a><span class="lineno"> 1015</span>  wnd = <a class="code" href="../../d4/da4/def_8h.html#a748f5df614a3fc989e8900fd229d6e4e">LWIP_MIN</a>(pcb->snd_wnd, pcb->cwnd);</div>
<div class="line"><a name="l01016"></a><span class="lineno"> 1016</span>  </div>
<div class="line"><a name="l01017"></a><span class="lineno"> 1017</span>  seg = pcb->unsent;</div>
<div class="line"><a name="l01018"></a><span class="lineno"> 1018</span>  </div>
<div class="line"><a name="l01019"></a><span class="lineno"> 1019</span>  <span class="comment">/* If the TF_ACK_NOW flag is set and no data will be sent (either</span></div>
<div class="line"><a name="l01020"></a><span class="lineno"> 1020</span> <span class="comment"> * because the ->unsent queue is empty or because the window does</span></div>
<div class="line"><a name="l01021"></a><span class="lineno"> 1021</span> <span class="comment"> * not allow it), construct an empty ACK segment and send it.</span></div>
<div class="line"><a name="l01022"></a><span class="lineno"> 1022</span> <span class="comment"> *</span></div>
<div class="line"><a name="l01023"></a><span class="lineno"> 1023</span> <span class="comment"> * If data is to be sent, we will just piggyback the ACK (see below).</span></div>
<div class="line"><a name="l01024"></a><span class="lineno"> 1024</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01025"></a><span class="lineno"> 1025</span>  <span class="keywordflow">if</span> (pcb->flags & TF_ACK_NOW &&</div>
<div class="line"><a name="l01026"></a><span class="lineno"> 1026</span>  (seg == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> ||</div>
<div class="line"><a name="l01027"></a><span class="lineno"> 1027</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno) - pcb->lastack + seg->len > wnd)) {</div>
<div class="line"><a name="l01028"></a><span class="lineno"> 1028</span>  <span class="keywordflow">return</span> tcp_send_empty_ack(pcb);</div>
<div class="line"><a name="l01029"></a><span class="lineno"> 1029</span>  }</div>
<div class="line"><a name="l01030"></a><span class="lineno"> 1030</span>  </div>
<div class="line"><a name="l01031"></a><span class="lineno"> 1031</span>  <span class="comment">/* useg should point to last segment on unacked queue */</span></div>
<div class="line"><a name="l01032"></a><span class="lineno"> 1032</span>  useg = pcb->unacked;</div>
<div class="line"><a name="l01033"></a><span class="lineno"> 1033</span>  <span class="keywordflow">if</span> (useg != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01034"></a><span class="lineno"> 1034</span>  <span class="keywordflow">for</span> (; useg->next != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>; useg = useg->next);</div>
<div class="line"><a name="l01035"></a><span class="lineno"> 1035</span>  }</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>  <a class="code" href="../../d2/dd6/structnetif.html">netif</a> = ip_route(&pcb->local_ip, &pcb->remote_ip);</div>
<div class="line"><a name="l01038"></a><span class="lineno"> 1038</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d2/dd6/structnetif.html">netif</a> == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01039"></a><span class="lineno"> 1039</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadca9448893187313c0c5a502ca9a9ad1c2a">ERR_RTE</a>;</div>
<div class="line"><a name="l01040"></a><span class="lineno"> 1040</span>  }</div>
<div class="line"><a name="l01041"></a><span class="lineno"> 1041</span>  </div>
<div class="line"><a name="l01042"></a><span class="lineno"> 1042</span>  <span class="comment">/* If we don't have a local IP address, we get one from netif */</span></div>
<div class="line"><a name="l01043"></a><span class="lineno"> 1043</span>  <span class="keywordflow">if</span> (<a class="code" href="../../de/df7/ip__addr_8h.html#a279118890e6a90aa740051fb8b0cc5f4">ip_addr_isany</a>(&pcb->local_ip)) {</div>
<div class="line"><a name="l01044"></a><span class="lineno"> 1044</span>  <span class="keyword">const</span> <a class="code" href="../../de/df7/ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *local_ip = ip_netif_get_local_ip(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, &pcb->remote_ip);</div>
<div class="line"><a name="l01045"></a><span class="lineno"> 1045</span>  <span class="keywordflow">if</span> (local_ip == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01046"></a><span class="lineno"> 1046</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadca9448893187313c0c5a502ca9a9ad1c2a">ERR_RTE</a>;</div>
<div class="line"><a name="l01047"></a><span class="lineno"> 1047</span>  }</div>
<div class="line"><a name="l01048"></a><span class="lineno"> 1048</span>  <a class="code" href="../../de/df7/ip__addr_8h.html#a77a933975db287f6aa5c2e70249ba18f">ip_addr_copy</a>(pcb->local_ip, *local_ip);</div>
<div class="line"><a name="l01049"></a><span class="lineno"> 1049</span>  }</div>
<div class="line"><a name="l01050"></a><span class="lineno"> 1050</span>  </div>
<div class="line"><a name="l01051"></a><span class="lineno"> 1051</span> <span class="preprocessor">#if TCP_OUTPUT_DEBUG</span></div>
<div class="line"><a name="l01052"></a><span class="lineno"> 1052</span>  <span class="keywordflow">if</span> (seg == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01053"></a><span class="lineno"> 1053</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a>, (<span class="stringliteral">"tcp_output: nothing to send (%p)\n"</span>,</div>
<div class="line"><a name="l01054"></a><span class="lineno"> 1054</span>  (<span class="keywordtype">void</span>*)pcb->unsent));</div>
<div class="line"><a name="l01055"></a><span class="lineno"> 1055</span>  }</div>
<div class="line"><a name="l01056"></a><span class="lineno"> 1056</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OUTPUT_DEBUG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01057"></a><span class="lineno"> 1057</span> <span class="preprocessor">#if TCP_CWND_DEBUG</span></div>
<div class="line"><a name="l01058"></a><span class="lineno"> 1058</span>  <span class="keywordflow">if</span> (seg == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</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#a66df03d8192cd978d3321a9d68bf5411">TCP_CWND_DEBUG</a>, (<span class="stringliteral">"tcp_output: snd_wnd %"</span>TCPWNDSIZE_F</div>
<div class="line"><a name="l01060"></a><span class="lineno"> 1060</span>  <span class="stringliteral">", cwnd %"</span>TCPWNDSIZE_F<span class="stringliteral">", wnd %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a></div>
<div class="line"><a name="l01061"></a><span class="lineno"> 1061</span>  <span class="stringliteral">", seg == NULL, ack %"</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="l01062"></a><span class="lineno"> 1062</span>  pcb->snd_wnd, pcb->cwnd, wnd, pcb->lastack));</div>
<div class="line"><a name="l01063"></a><span class="lineno"> 1063</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01064"></a><span class="lineno"> 1064</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>,</div>
<div class="line"><a name="l01065"></a><span class="lineno"> 1065</span>  (<span class="stringliteral">"tcp_output: snd_wnd %"</span>TCPWNDSIZE_F<span class="stringliteral">", cwnd %"</span>TCPWNDSIZE_F<span class="stringliteral">", wnd %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a></div>
<div class="line"><a name="l01066"></a><span class="lineno"> 1066</span>  <span class="stringliteral">", effwnd %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">", seq %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">", ack %"</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="l01067"></a><span class="lineno"> 1067</span>  pcb->snd_wnd, pcb->cwnd, wnd,</div>
<div class="line"><a name="l01068"></a><span class="lineno"> 1068</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno) - pcb->lastack + seg->len,</div>
<div class="line"><a name="l01069"></a><span class="lineno"> 1069</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno), pcb->lastack));</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="preprocessor">#endif </span><span class="comment">/* TCP_CWND_DEBUG */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01072"></a><span class="lineno"> 1072</span>  <span class="comment">/* Check if we need to start the persistent timer when the next unsent segment</span></div>
<div class="line"><a name="l01073"></a><span class="lineno"> 1073</span> <span class="comment"> * does not fit within the remaining send window and RTO timer is not running (we</span></div>
<div class="line"><a name="l01074"></a><span class="lineno"> 1074</span> <span class="comment"> * have no in-flight data). A traditional approach would fill the remaining window</span></div>
<div class="line"><a name="l01075"></a><span class="lineno"> 1075</span> <span class="comment"> * with part of the unsent segment (which will engage zero-window probing upon</span></div>
<div class="line"><a name="l01076"></a><span class="lineno"> 1076</span> <span class="comment"> * reception of the zero window update from the receiver). This ensures the</span></div>
<div class="line"><a name="l01077"></a><span class="lineno"> 1077</span> <span class="comment"> * subsequent window update is reliably received. With the goal of being lightweight,</span></div>
<div class="line"><a name="l01078"></a><span class="lineno"> 1078</span> <span class="comment"> * we avoid splitting the unsent segment and treat the window as already zero.</span></div>
<div class="line"><a name="l01079"></a><span class="lineno"> 1079</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01080"></a><span class="lineno"> 1080</span>  <span class="keywordflow">if</span> (seg != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> &&</div>
<div class="line"><a name="l01081"></a><span class="lineno"> 1081</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno) - pcb->lastack + seg->len > wnd &&</div>
<div class="line"><a name="l01082"></a><span class="lineno"> 1082</span>  wnd > 0 && wnd == pcb->snd_wnd && pcb->unacked == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01083"></a><span class="lineno"> 1083</span>  <span class="comment">/* Start the persist timer */</span></div>
<div class="line"><a name="l01084"></a><span class="lineno"> 1084</span>  <span class="keywordflow">if</span> (pcb->persist_backoff == 0) {</div>
<div class="line"><a name="l01085"></a><span class="lineno"> 1085</span>  pcb->persist_cnt = 0;</div>
<div class="line"><a name="l01086"></a><span class="lineno"> 1086</span>  pcb->persist_backoff = 1;</div>
<div class="line"><a name="l01087"></a><span class="lineno"> 1087</span>  }</div>
<div class="line"><a name="l01088"></a><span class="lineno"> 1088</span>  <span class="keywordflow">goto</span> output_done;</div>
<div class="line"><a name="l01089"></a><span class="lineno"> 1089</span>  }</div>
<div class="line"><a name="l01090"></a><span class="lineno"> 1090</span>  <span class="comment">/* data available and window allows it to be sent? */</span></div>
<div class="line"><a name="l01091"></a><span class="lineno"> 1091</span>  <span class="keywordflow">while</span> (seg != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> &&</div>
<div class="line"><a name="l01092"></a><span class="lineno"> 1092</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno) - pcb->lastack + seg->len <= wnd) {</div>
<div class="line"><a name="l01093"></a><span class="lineno"> 1093</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"RST not expected here!"</span>,</div>
<div class="line"><a name="l01094"></a><span class="lineno"> 1094</span>  (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(seg->tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5ca559def464ef20d8b1f7d32f2f160d">TCP_RST</a>) == 0);</div>
<div class="line"><a name="l01095"></a><span class="lineno"> 1095</span>  <span class="comment">/* Stop sending if the nagle algorithm would prevent it</span></div>
<div class="line"><a name="l01096"></a><span class="lineno"> 1096</span> <span class="comment"> * Don't stop:</span></div>
<div class="line"><a name="l01097"></a><span class="lineno"> 1097</span> <span class="comment"> * - if tcp_write had a memory error before (prevent delayed ACK timeout) or</span></div>
<div class="line"><a name="l01098"></a><span class="lineno"> 1098</span> <span class="comment"> * - if FIN was already enqueued for this PCB (SYN is always alone in a segment -</span></div>
<div class="line"><a name="l01099"></a><span class="lineno"> 1099</span> <span class="comment"> * either seg->next != NULL or pcb->unacked == NULL;</span></div>
<div class="line"><a name="l01100"></a><span class="lineno"> 1100</span> <span class="comment"> * RST is no sent using tcp_write/tcp_output.</span></div>
<div class="line"><a name="l01101"></a><span class="lineno"> 1101</span> <span class="comment"> */</span></div>
<div class="line"><a name="l01102"></a><span class="lineno"> 1102</span>  <span class="keywordflow">if</span> ((tcp_do_output_nagle(pcb) == 0) &&</div>
<div class="line"><a name="l01103"></a><span class="lineno"> 1103</span>  ((pcb->flags & (TF_NAGLEMEMERR | TF_FIN)) == 0)) {</div>
<div class="line"><a name="l01104"></a><span class="lineno"> 1104</span>  <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l01105"></a><span class="lineno"> 1105</span>  }</div>
<div class="line"><a name="l01106"></a><span class="lineno"> 1106</span> <span class="preprocessor">#if TCP_CWND_DEBUG</span></div>
<div class="line"><a name="l01107"></a><span class="lineno"> 1107</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_output: snd_wnd %"</span>TCPWNDSIZE_F<span class="stringliteral">", cwnd %"</span>TCPWNDSIZE_F<span class="stringliteral">", wnd %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">", effwnd %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">", seq %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">", ack %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">", i %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gac05a82d37afb251470f5e17ca15ab6e9">S16_F</a><span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l01108"></a><span class="lineno"> 1108</span>  pcb->snd_wnd, pcb->cwnd, wnd,</div>
<div class="line"><a name="l01109"></a><span class="lineno"> 1109</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno) + seg->len -</div>
<div class="line"><a name="l01110"></a><span class="lineno"> 1110</span>  pcb->lastack,</div>
<div class="line"><a name="l01111"></a><span class="lineno"> 1111</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno), pcb->lastack, i));</div>
<div class="line"><a name="l01112"></a><span class="lineno"> 1112</span>  ++i;</div>
<div class="line"><a name="l01113"></a><span class="lineno"> 1113</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CWND_DEBUG */</span><span class="preprocessor"></span></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>  <span class="keywordflow">if</span> (pcb->state != SYN_SENT) {</div>
<div class="line"><a name="l01116"></a><span class="lineno"> 1116</span>  <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a42432f2dde6716ecb0087ccbc47cc75b">TCPH_SET_FLAG</a>(seg->tcphdr, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>);</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="preprocessor">#if TCP_OVERSIZE_DBGCHECK</span></div>
<div class="line"><a name="l01120"></a><span class="lineno"> 1120</span>  seg->oversize_left = 0;</div>
<div class="line"><a name="l01121"></a><span class="lineno"> 1121</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE_DBGCHECK */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01122"></a><span class="lineno"> 1122</span>  err = tcp_output_segment(seg, pcb, <a class="code" href="../../d2/dd6/structnetif.html">netif</a>);</div>
<div class="line"><a name="l01123"></a><span class="lineno"> 1123</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="l01124"></a><span class="lineno"> 1124</span>  <span class="comment">/* segment could not be sent, for whatever reason */</span></div>
<div class="line"><a name="l01125"></a><span class="lineno"> 1125</span>  pcb->flags |= TF_NAGLEMEMERR;</div>
<div class="line"><a name="l01126"></a><span class="lineno"> 1126</span>  <span class="keywordflow">return</span> err;</div>
<div class="line"><a name="l01127"></a><span class="lineno"> 1127</span>  }</div>
<div class="line"><a name="l01128"></a><span class="lineno"> 1128</span>  pcb->unsent = seg->next;</div>
<div class="line"><a name="l01129"></a><span class="lineno"> 1129</span>  <span class="keywordflow">if</span> (pcb->state != SYN_SENT) {</div>
<div class="line"><a name="l01130"></a><span class="lineno"> 1130</span>  pcb->flags &= ~(TF_ACK_DELAY | TF_ACK_NOW);</div>
<div class="line"><a name="l01131"></a><span class="lineno"> 1131</span>  }</div>
<div class="line"><a name="l01132"></a><span class="lineno"> 1132</span>  snd_nxt = <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno) + TCP_TCPLEN(seg);</div>
<div class="line"><a name="l01133"></a><span class="lineno"> 1133</span>  <span class="keywordflow">if</span> (TCP_SEQ_LT(pcb->snd_nxt, snd_nxt)) {</div>
<div class="line"><a name="l01134"></a><span class="lineno"> 1134</span>  pcb->snd_nxt = snd_nxt;</div>
<div class="line"><a name="l01135"></a><span class="lineno"> 1135</span>  }</div>
<div class="line"><a name="l01136"></a><span class="lineno"> 1136</span>  <span class="comment">/* put segment on unacknowledged list if length > 0 */</span></div>
<div class="line"><a name="l01137"></a><span class="lineno"> 1137</span>  <span class="keywordflow">if</span> (TCP_TCPLEN(seg) > 0) {</div>
<div class="line"><a name="l01138"></a><span class="lineno"> 1138</span>  seg->next = <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>;</div>
<div class="line"><a name="l01139"></a><span class="lineno"> 1139</span>  <span class="comment">/* unacked list is empty? */</span></div>
<div class="line"><a name="l01140"></a><span class="lineno"> 1140</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="l01141"></a><span class="lineno"> 1141</span>  pcb->unacked = seg;</div>
<div class="line"><a name="l01142"></a><span class="lineno"> 1142</span>  useg = seg;</div>
<div class="line"><a name="l01143"></a><span class="lineno"> 1143</span>  <span class="comment">/* unacked list is not empty? */</span></div>
<div class="line"><a name="l01144"></a><span class="lineno"> 1144</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01145"></a><span class="lineno"> 1145</span>  <span class="comment">/* In the case of fast retransmit, the packet should not go to the tail</span></div>
<div class="line"><a name="l01146"></a><span class="lineno"> 1146</span> <span class="comment"> * of the unacked queue, but rather somewhere before it. We need to check for</span></div>
<div class="line"><a name="l01147"></a><span class="lineno"> 1147</span> <span class="comment"> * this case. -STJ Jul 27, 2004 */</span></div>
<div class="line"><a name="l01148"></a><span class="lineno"> 1148</span>  <span class="keywordflow">if</span> (TCP_SEQ_LT(<a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno), <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(useg->tcphdr->seqno))) {</div>
<div class="line"><a name="l01149"></a><span class="lineno"> 1149</span>  <span class="comment">/* add segment to before tail of unacked list, keeping the list sorted */</span></div>
<div class="line"><a name="l01150"></a><span class="lineno"> 1150</span>  <span class="keyword">struct </span>tcp_seg **cur_seg = &(pcb->unacked);</div>
<div class="line"><a name="l01151"></a><span class="lineno"> 1151</span>  <span class="keywordflow">while</span> (*cur_seg &&</div>
<div class="line"><a name="l01152"></a><span class="lineno"> 1152</span>  TCP_SEQ_LT(<a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>((*cur_seg)->tcphdr->seqno), <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno))) {</div>
<div class="line"><a name="l01153"></a><span class="lineno"> 1153</span>  cur_seg = &((*cur_seg)->next );</div>
<div class="line"><a name="l01154"></a><span class="lineno"> 1154</span>  }</div>
<div class="line"><a name="l01155"></a><span class="lineno"> 1155</span>  seg->next = (*cur_seg);</div>
<div class="line"><a name="l01156"></a><span class="lineno"> 1156</span>  (*cur_seg) = seg;</div>
<div class="line"><a name="l01157"></a><span class="lineno"> 1157</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01158"></a><span class="lineno"> 1158</span>  <span class="comment">/* add segment to tail of unacked list */</span></div>
<div class="line"><a name="l01159"></a><span class="lineno"> 1159</span>  useg->next = seg;</div>
<div class="line"><a name="l01160"></a><span class="lineno"> 1160</span>  useg = useg->next;</div>
<div class="line"><a name="l01161"></a><span class="lineno"> 1161</span>  }</div>
<div class="line"><a name="l01162"></a><span class="lineno"> 1162</span>  }</div>
<div class="line"><a name="l01163"></a><span class="lineno"> 1163</span>  <span class="comment">/* do not queue empty segments on the unacked list */</span></div>
<div class="line"><a name="l01164"></a><span class="lineno"> 1164</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01165"></a><span class="lineno"> 1165</span>  tcp_seg_free(seg);</div>
<div class="line"><a name="l01166"></a><span class="lineno"> 1166</span>  }</div>
<div class="line"><a name="l01167"></a><span class="lineno"> 1167</span>  seg = pcb->unsent;</div>
<div class="line"><a name="l01168"></a><span class="lineno"> 1168</span>  }</div>
<div class="line"><a name="l01169"></a><span class="lineno"> 1169</span> output_done:</div>
<div class="line"><a name="l01170"></a><span class="lineno"> 1170</span> <span class="preprocessor">#if TCP_OVERSIZE</span></div>
<div class="line"><a name="l01171"></a><span class="lineno"> 1171</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="l01172"></a><span class="lineno"> 1172</span>  <span class="comment">/* last unsent has been removed, reset unsent_oversize */</span></div>
<div class="line"><a name="l01173"></a><span class="lineno"> 1173</span>  pcb->unsent_oversize = 0;</div>
<div class="line"><a name="l01174"></a><span class="lineno"> 1174</span>  }</div>
<div class="line"><a name="l01175"></a><span class="lineno"> 1175</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01176"></a><span class="lineno"> 1176</span>  </div>
<div class="line"><a name="l01177"></a><span class="lineno"> 1177</span>  pcb->flags &= ~TF_NAGLEMEMERR;</div>
<div class="line"><a name="l01178"></a><span class="lineno"> 1178</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="l01179"></a><span class="lineno"> 1179</span> }</div>
<div class="line"><a name="l01180"></a><span class="lineno"> 1180</span>  </div>
<div class="line"><a name="l01188"></a><span class="lineno"> 1188</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="l01189"></a><span class="lineno"> 1189</span> tcp_output_segment(<span class="keyword">struct</span> tcp_seg *seg, <span class="keyword">struct</span> tcp_pcb *pcb, <span class="keyword">struct</span> <a class="code" href="../../d2/dd6/structnetif.html">netif</a> *<a class="code" href="../../d2/dd6/structnetif.html">netif</a>)</div>
<div class="line"><a name="l01190"></a><span class="lineno"> 1190</span> {</div>
<div class="line"><a name="l01191"></a><span class="lineno"> 1191</span>  <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err;</div>
<div class="line"><a name="l01192"></a><span class="lineno"> 1192</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> len;</div>
<div class="line"><a name="l01193"></a><span class="lineno"> 1193</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> *opts;</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="keywordflow">if</span> (seg->p->ref != 1) {</div>
<div class="line"><a name="l01196"></a><span class="lineno"> 1196</span>  <span class="comment">/* This can happen if the pbuf of this segment is still referenced by the</span></div>
<div class="line"><a name="l01197"></a><span class="lineno"> 1197</span> <span class="comment"> netif driver due to deferred transmission. Since this function modifies</span></div>
<div class="line"><a name="l01198"></a><span class="lineno"> 1198</span> <span class="comment"> p->len, we must not continue in this case. */</span></div>
<div class="line"><a name="l01199"></a><span class="lineno"> 1199</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="l01200"></a><span class="lineno"> 1200</span>  }</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>  <span class="comment">/* The TCP header has already been constructed, but the ackno and</span></div>
<div class="line"><a name="l01203"></a><span class="lineno"> 1203</span> <span class="comment"> wnd fields remain. */</span></div>
<div class="line"><a name="l01204"></a><span class="lineno"> 1204</span>  seg->tcphdr->ackno = <a class="code" href="../../d2/d6e/def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(pcb->rcv_nxt);</div>
<div class="line"><a name="l01205"></a><span class="lineno"> 1205</span>  </div>
<div class="line"><a name="l01206"></a><span class="lineno"> 1206</span>  <span class="comment">/* advertise our receive window size in this TCP segment */</span></div>
<div class="line"><a name="l01207"></a><span class="lineno"> 1207</span> <span class="preprocessor">#if LWIP_WND_SCALE</span></div>
<div class="line"><a name="l01208"></a><span class="lineno"> 1208</span>  <span class="keywordflow">if</span> (seg->flags & TF_SEG_OPTS_WND_SCALE) {</div>
<div class="line"><a name="l01209"></a><span class="lineno"> 1209</span>  <span class="comment">/* The Window field in a SYN segment itself (the only type where we send</span></div>
<div class="line"><a name="l01210"></a><span class="lineno"> 1210</span> <span class="comment"> the window scale option) is never scaled. */</span></div>
<div class="line"><a name="l01211"></a><span class="lineno"> 1211</span>  seg->tcphdr->wnd = <a class="code" href="../../d2/d6e/def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>(TCPWND_MIN16(pcb->rcv_ann_wnd));</div>
<div class="line"><a name="l01212"></a><span class="lineno"> 1212</span>  } <span class="keywordflow">else</span></div>
<div class="line"><a name="l01213"></a><span class="lineno"> 1213</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_WND_SCALE */</span><span class="preprocessor"></span></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>  seg->tcphdr->wnd = <a class="code" href="../../d2/d6e/def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>(TCPWND_MIN16(RCV_WND_SCALE(pcb, pcb->rcv_ann_wnd)));</div>
<div class="line"><a name="l01216"></a><span class="lineno"> 1216</span>  }</div>
<div class="line"><a name="l01217"></a><span class="lineno"> 1217</span>  </div>
<div class="line"><a name="l01218"></a><span class="lineno"> 1218</span>  pcb->rcv_ann_right_edge = pcb->rcv_nxt + pcb->rcv_ann_wnd;</div>
<div class="line"><a name="l01219"></a><span class="lineno"> 1219</span>  </div>
<div class="line"><a name="l01220"></a><span class="lineno"> 1220</span>  <span class="comment">/* Add any requested options. NB MSS option is only set on SYN</span></div>
<div class="line"><a name="l01221"></a><span class="lineno"> 1221</span> <span class="comment"> packets, so ignore it here */</span></div>
<div class="line"><a name="l01222"></a><span class="lineno"> 1222</span>  <span class="comment">/* cast through void* to get rid of alignment warnings */</span></div>
<div class="line"><a name="l01223"></a><span class="lineno"> 1223</span>  opts = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> *)(<span class="keywordtype">void</span> *)(seg->tcphdr + 1);</div>
<div class="line"><a name="l01224"></a><span class="lineno"> 1224</span>  <span class="keywordflow">if</span> (seg->flags & TF_SEG_OPTS_MSS) {</div>
<div class="line"><a name="l01225"></a><span class="lineno"> 1225</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> mss;</div>
<div class="line"><a name="l01226"></a><span class="lineno"> 1226</span> <span class="preprocessor">#if TCP_CALCULATE_EFF_SEND_MSS</span></div>
<div class="line"><a name="l01227"></a><span class="lineno"> 1227</span>  mss = tcp_eff_send_mss(<a class="code" href="../../d2/d78/lwipopts_8h.html#af1ab7bb27860aa3677c387a2f3ba317b">TCP_MSS</a>, &pcb->local_ip, &pcb->remote_ip);</div>
<div class="line"><a name="l01228"></a><span class="lineno"> 1228</span> <span class="preprocessor">#else </span><span class="comment">/* TCP_CALCULATE_EFF_SEND_MSS */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01229"></a><span class="lineno"> 1229</span>  mss = <a class="code" href="../../d2/d78/lwipopts_8h.html#af1ab7bb27860aa3677c387a2f3ba317b">TCP_MSS</a>;</div>
<div class="line"><a name="l01230"></a><span class="lineno"> 1230</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="l01231"></a><span class="lineno"> 1231</span>  *opts = TCP_BUILD_MSS_OPTION(mss);</div>
<div class="line"><a name="l01232"></a><span class="lineno"> 1232</span>  opts += 1;</div>
<div class="line"><a name="l01233"></a><span class="lineno"> 1233</span>  }</div>
<div class="line"><a name="l01234"></a><span class="lineno"> 1234</span> <span class="preprocessor">#if LWIP_TCP_TIMESTAMPS</span></div>
<div class="line"><a name="l01235"></a><span class="lineno"> 1235</span>  pcb->ts_lastacksent = pcb->rcv_nxt;</div>
<div class="line"><a name="l01236"></a><span class="lineno"> 1236</span>  </div>
<div class="line"><a name="l01237"></a><span class="lineno"> 1237</span>  <span class="keywordflow">if</span> (seg->flags & TF_SEG_OPTS_TS) {</div>
<div class="line"><a name="l01238"></a><span class="lineno"> 1238</span>  tcp_build_timestamp_option(pcb, opts);</div>
<div class="line"><a name="l01239"></a><span class="lineno"> 1239</span>  opts += 3;</div>
<div class="line"><a name="l01240"></a><span class="lineno"> 1240</span>  }</div>
<div class="line"><a name="l01241"></a><span class="lineno"> 1241</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l01242"></a><span class="lineno"> 1242</span> <span class="preprocessor">#if LWIP_WND_SCALE</span></div>
<div class="line"><a name="l01243"></a><span class="lineno"> 1243</span>  <span class="keywordflow">if</span> (seg->flags & TF_SEG_OPTS_WND_SCALE) {</div>
<div class="line"><a name="l01244"></a><span class="lineno"> 1244</span>  tcp_build_wnd_scale_option(opts);</div>
<div class="line"><a name="l01245"></a><span class="lineno"> 1245</span>  opts += 1;</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> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l01248"></a><span class="lineno"> 1248</span>  </div>
<div class="line"><a name="l01249"></a><span class="lineno"> 1249</span>  <span class="comment">/* Set retransmission timer running if it is not currently enabled</span></div>
<div class="line"><a name="l01250"></a><span class="lineno"> 1250</span> <span class="comment"> This must be set before checking the route. */</span></div>
<div class="line"><a name="l01251"></a><span class="lineno"> 1251</span>  <span class="keywordflow">if</span> (pcb->rtime < 0) {</div>
<div class="line"><a name="l01252"></a><span class="lineno"> 1252</span>  pcb->rtime = 0;</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>  </div>
<div class="line"><a name="l01255"></a><span class="lineno"> 1255</span>  <span class="keywordflow">if</span> (pcb->rttest == 0) {</div>
<div class="line"><a name="l01256"></a><span class="lineno"> 1256</span>  pcb->rttest = tcp_ticks;</div>
<div class="line"><a name="l01257"></a><span class="lineno"> 1257</span>  pcb->rtseq = <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno);</div>
<div class="line"><a name="l01258"></a><span class="lineno"> 1258</span>  </div>
<div class="line"><a name="l01259"></a><span class="lineno"> 1259</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_output_segment: rtseq %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">"\n"</span>, pcb->rtseq));</div>
<div class="line"><a name="l01260"></a><span class="lineno"> 1260</span>  }</div>
<div class="line"><a name="l01261"></a><span class="lineno"> 1261</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a>, (<span class="stringliteral">"tcp_output_segment: %"</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="l01262"></a><span class="lineno"> 1262</span>  <a class="code" href="../../d2/d6e/def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(seg->tcphdr->seqno), <a class="code" href="../../d2/d6e/def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(seg->tcphdr->seqno) +</div>
<div class="line"><a name="l01263"></a><span class="lineno"> 1263</span>  seg->len));</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>  len = (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)((<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)seg->tcphdr - (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)seg->p->payload);</div>
<div class="line"><a name="l01266"></a><span class="lineno"> 1266</span>  <span class="keywordflow">if</span> (len == 0) {</div>
<div class="line"><a name="l01268"></a><span class="lineno"> 1268</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a237a8f1e47af42fb612e936e928a9ced">MIB2_STATS_INC</a>(mib2.tcpoutsegs);</div>
<div class="line"><a name="l01269"></a><span class="lineno"> 1269</span>  }</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>  seg->p->len -= len;</div>
<div class="line"><a name="l01272"></a><span class="lineno"> 1272</span>  seg->p->tot_len -= len;</div>
<div class="line"><a name="l01273"></a><span class="lineno"> 1273</span>  </div>
<div class="line"><a name="l01274"></a><span class="lineno"> 1274</span>  seg->p->payload = seg->tcphdr;</div>
<div class="line"><a name="l01275"></a><span class="lineno"> 1275</span>  </div>
<div class="line"><a name="l01276"></a><span class="lineno"> 1276</span>  seg->tcphdr->chksum = 0;</div>
<div class="line"><a name="l01277"></a><span class="lineno"> 1277</span> <span class="preprocessor">#if CHECKSUM_GEN_TCP</span></div>
<div class="line"><a name="l01278"></a><span class="lineno"> 1278</span>  <a class="code" href="../../d9/d69/netif_8h.html#ad968df1b35c2fae368e087966e3bc677">IF__NETIF_CHECKSUM_ENABLED</a>(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, NETIF_CHECKSUM_GEN_TCP) {</div>
<div class="line"><a name="l01279"></a><span class="lineno"> 1279</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY</span></div>
<div class="line"><a name="l01280"></a><span class="lineno"> 1280</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> acc;</div>
<div class="line"><a name="l01281"></a><span class="lineno"> 1281</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY_SANITY_CHECK</span></div>
<div class="line"><a name="l01282"></a><span class="lineno"> 1282</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> chksum_slow = <a class="code" href="../../d2/d45/inet__chksum_8h.html#aa13cda42e7c262f5dee243ff6c28422f">ip_chksum_pseudo</a>(seg->p, <a class="code" href="../../d4/d19/prot_2ip_8h.html#a634284ee3a136d6ad61bc5d917ebb82f">IP_PROTO_TCP</a>,</div>
<div class="line"><a name="l01283"></a><span class="lineno"> 1283</span>  seg->p->tot_len, &pcb->local_ip, &pcb->remote_ip);</div>
<div class="line"><a name="l01284"></a><span class="lineno"> 1284</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CHECKSUM_ON_COPY_SANITY_CHECK */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01285"></a><span class="lineno"> 1285</span>  <span class="keywordflow">if</span> ((seg->flags & TF_SEG_DATA_CHECKSUMMED) == 0) {</div>
<div class="line"><a name="l01286"></a><span class="lineno"> 1286</span>  <a class="code" href="../../db/d16/debug_8h.html#a94ad086267808462beae2b38f91996ed">LWIP_ASSERT</a>(<span class="stringliteral">"data included but not checksummed"</span>,</div>
<div class="line"><a name="l01287"></a><span class="lineno"> 1287</span>  seg->p->tot_len == (<a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5b97d3b7e68c20eb3eab87a61d779223">TCPH_HDRLEN</a>(seg->tcphdr) * 4));</div>
<div class="line"><a name="l01288"></a><span class="lineno"> 1288</span>  }</div>
<div class="line"><a name="l01289"></a><span class="lineno"> 1289</span>  </div>
<div class="line"><a name="l01290"></a><span class="lineno"> 1290</span>  <span class="comment">/* rebuild TCP header checksum (TCP header changes for retransmissions!) */</span></div>
<div class="line"><a name="l01291"></a><span class="lineno"> 1291</span>  acc = <a class="code" href="../../d2/d45/inet__chksum_8h.html#acfe7ab6c63ef998210c66bb4822b03b2">ip_chksum_pseudo_partial</a>(seg->p, <a class="code" href="../../d4/d19/prot_2ip_8h.html#a634284ee3a136d6ad61bc5d917ebb82f">IP_PROTO_TCP</a>,</div>
<div class="line"><a name="l01292"></a><span class="lineno"> 1292</span>  seg->p->tot_len, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5b97d3b7e68c20eb3eab87a61d779223">TCPH_HDRLEN</a>(seg->tcphdr) * 4, &pcb->local_ip, &pcb->remote_ip);</div>
<div class="line"><a name="l01293"></a><span class="lineno"> 1293</span>  <span class="comment">/* add payload checksum */</span></div>
<div class="line"><a name="l01294"></a><span class="lineno"> 1294</span>  <span class="keywordflow">if</span> (seg->chksum_swapped) {</div>
<div class="line"><a name="l01295"></a><span class="lineno"> 1295</span>  seg->chksum = <a class="code" href="../../d2/d45/inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a>(seg->chksum);</div>
<div class="line"><a name="l01296"></a><span class="lineno"> 1296</span>  seg->chksum_swapped = 0;</div>
<div class="line"><a name="l01297"></a><span class="lineno"> 1297</span>  }</div>
<div class="line"><a name="l01298"></a><span class="lineno"> 1298</span>  acc += (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)~(seg->chksum);</div>
<div class="line"><a name="l01299"></a><span class="lineno"> 1299</span>  seg->tcphdr->chksum = <a class="code" href="../../d2/d45/inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a>(acc);</div>
<div class="line"><a name="l01300"></a><span class="lineno"> 1300</span> <span class="preprocessor">#if TCP_CHECKSUM_ON_COPY_SANITY_CHECK</span></div>
<div class="line"><a name="l01301"></a><span class="lineno"> 1301</span>  <span class="keywordflow">if</span> (chksum_slow != seg->tcphdr->chksum) {</div>
<div class="line"><a name="l01302"></a><span class="lineno"> 1302</span>  TCP_CHECKSUM_ON_COPY_SANITY_CHECK_FAIL(</div>
<div class="line"><a name="l01303"></a><span class="lineno"> 1303</span>  (<span class="stringliteral">"tcp_output_segment: calculated checksum is %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga1418f92673e54a36b6e376109e526382">X16_F</a><span class="stringliteral">" instead of %"</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="l01304"></a><span class="lineno"> 1304</span>  seg->tcphdr->chksum, chksum_slow));</div>
<div class="line"><a name="l01305"></a><span class="lineno"> 1305</span>  seg->tcphdr->chksum = chksum_slow;</div>
<div class="line"><a name="l01306"></a><span class="lineno"> 1306</span>  }</div>
<div class="line"><a name="l01307"></a><span class="lineno"> 1307</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CHECKSUM_ON_COPY_SANITY_CHECK */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01308"></a><span class="lineno"> 1308</span> <span class="preprocessor">#else </span><span class="comment">/* TCP_CHECKSUM_ON_COPY */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01309"></a><span class="lineno"> 1309</span>  seg->tcphdr->chksum = <a class="code" href="../../d2/d45/inet__chksum_8h.html#aa13cda42e7c262f5dee243ff6c28422f">ip_chksum_pseudo</a>(seg->p, <a class="code" href="../../d4/d19/prot_2ip_8h.html#a634284ee3a136d6ad61bc5d917ebb82f">IP_PROTO_TCP</a>,</div>
<div class="line"><a name="l01310"></a><span class="lineno"> 1310</span>  seg->p->tot_len, &pcb->local_ip, &pcb->remote_ip);</div>
<div class="line"><a name="l01311"></a><span class="lineno"> 1311</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_CHECKSUM_ON_COPY */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01312"></a><span class="lineno"> 1312</span>  }</div>
<div class="line"><a name="l01313"></a><span class="lineno"> 1313</span> <span class="preprocessor">#endif </span><span class="comment">/* CHECKSUM_GEN_TCP */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01314"></a><span class="lineno"> 1314</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.xmit);</div>
<div class="line"><a name="l01315"></a><span class="lineno"> 1315</span>  </div>
<div class="line"><a name="l01316"></a><span class="lineno"> 1316</span>  <a class="code" href="../../d9/d69/netif_8h.html#ae1c22f1dab74a84d9e31316fd5fdfa11">NETIF_SET_HWADDRHINT</a>(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, &(pcb->addr_hint));</div>
<div class="line"><a name="l01317"></a><span class="lineno"> 1317</span>  err = ip_output_if(seg->p, &pcb->local_ip, &pcb->remote_ip, pcb->ttl,</div>
<div class="line"><a name="l01318"></a><span class="lineno"> 1318</span>  pcb->tos, <a class="code" href="../../d4/d19/prot_2ip_8h.html#a634284ee3a136d6ad61bc5d917ebb82f">IP_PROTO_TCP</a>, <a class="code" href="../../d2/dd6/structnetif.html">netif</a>);</div>
<div class="line"><a name="l01319"></a><span class="lineno"> 1319</span>  <a class="code" href="../../d9/d69/netif_8h.html#ae1c22f1dab74a84d9e31316fd5fdfa11">NETIF_SET_HWADDRHINT</a>(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);</div>
<div class="line"><a name="l01320"></a><span class="lineno"> 1320</span>  <span class="keywordflow">return</span> err;</div>
<div class="line"><a name="l01321"></a><span class="lineno"> 1321</span> }</div>
<div class="line"><a name="l01322"></a><span class="lineno"> 1322</span>  </div>
<div class="line"><a name="l01343"></a><span class="lineno"> 1343</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l01344"></a><span class="lineno"> 1344</span> tcp_rst(<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> seqno, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> ackno,</div>
<div class="line"><a name="l01345"></a><span class="lineno"> 1345</span>  <span class="keyword">const</span> <a class="code" href="../../de/df7/ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *local_ip, <span class="keyword">const</span> <a class="code" href="../../de/df7/ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a> *remote_ip,</div>
<div class="line"><a name="l01346"></a><span class="lineno"> 1346</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> local_port, <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> remote_port)</div>
<div class="line"><a name="l01347"></a><span class="lineno"> 1347</span> {</div>
<div class="line"><a name="l01348"></a><span class="lineno"> 1348</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p;</div>
<div class="line"><a name="l01349"></a><span class="lineno"> 1349</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="l01350"></a><span class="lineno"> 1350</span>  <span class="keyword">struct </span><a class="code" href="../../d2/dd6/structnetif.html">netif</a> *<a class="code" href="../../d2/dd6/structnetif.html">netif</a>;</div>
<div class="line"><a name="l01351"></a><span class="lineno"> 1351</span>  p = <a class="code" href="../../d7/d05/group__pbuf.html#gacfcb0a2af918658ba0afe36499c65f47">pbuf_alloc</a>(<a class="code" href="../../d7/d05/group__pbuf.html#ggaee1baa59bb2f85ba575b5a8619ac1ebfafcc1e506061ba69dfa142eb6b3da5f13">PBUF_IP</a>, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5758db371d6daa394d178429b7c94c2a">TCP_HLEN</a>, <a class="code" href="../../d7/d05/group__pbuf.html#ggab7e0e32fcc292c0d7107721766ed92fbac5e9f28455bca98944a030d4b84ecfab">PBUF_RAM</a>);</div>
<div class="line"><a name="l01352"></a><span class="lineno"> 1352</span>  <span class="keywordflow">if</span> (p == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01353"></a><span class="lineno"> 1353</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_rst: could not allocate memory for pbuf\n"</span>));</div>
<div class="line"><a name="l01354"></a><span class="lineno"> 1354</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l01355"></a><span class="lineno"> 1355</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">"check that first pbuf can hold struct tcp_hdr"</span>,</div>
<div class="line"><a name="l01357"></a><span class="lineno"> 1357</span>  (p-><a class="code" href="../../d9/db8/structpbuf.html#a6f82449625e36e294f5d210268c0703f">len</a> >= <span class="keyword">sizeof</span>(<span class="keyword">struct</span> <a class="code" href="../../db/df4/structtcp__hdr.html">tcp_hdr</a>)));</div>
<div class="line"><a name="l01358"></a><span class="lineno"> 1358</span>  </div>
<div class="line"><a name="l01359"></a><span class="lineno"> 1359</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="l01360"></a><span class="lineno"> 1360</span>  tcphdr->src = <a class="code" href="../../d2/d6e/def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>(local_port);</div>
<div class="line"><a name="l01361"></a><span class="lineno"> 1361</span>  tcphdr->dest = <a class="code" href="../../d2/d6e/def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a>(remote_port);</div>
<div class="line"><a name="l01362"></a><span class="lineno"> 1362</span>  tcphdr->seqno = <a class="code" href="../../d2/d6e/def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(seqno);</div>
<div class="line"><a name="l01363"></a><span class="lineno"> 1363</span>  tcphdr->ackno = <a class="code" href="../../d2/d6e/def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(ackno);</div>
<div class="line"><a name="l01364"></a><span class="lineno"> 1364</span>  <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a57fb29aed8df21ccff4481612ee40407">TCPH_HDRLEN_FLAGS_SET</a>(tcphdr, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5758db371d6daa394d178429b7c94c2a">TCP_HLEN</a>/4, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5ca559def464ef20d8b1f7d32f2f160d">TCP_RST</a> | <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a>);</div>
<div class="line"><a name="l01365"></a><span class="lineno"> 1365</span> <span class="preprocessor">#if LWIP_WND_SCALE</span></div>
<div class="line"><a name="l01366"></a><span class="lineno"> 1366</span>  tcphdr->wnd = <a class="code" href="../../d4/da4/def_8h.html#a0dfd02d7c09f9c698a5a7ecc0b7287ad">PP_HTONS</a>(((<a class="code" href="../../d2/d78/lwipopts_8h.html#a7f535a6efb5cdf86c3210e35ece1d6a7">TCP_WND</a> >> <a class="code" href="../../dd/da6/group__lwip__opts__tcp.html#ga768765a2c678fefeca6c89aae0cf629f">TCP_RCV_SCALE</a>) & 0xFFFF));</div>
<div class="line"><a name="l01367"></a><span class="lineno"> 1367</span> <span class="preprocessor">#else</span></div>
<div class="line"><a name="l01368"></a><span class="lineno"> 1368</span>  tcphdr->wnd = <a class="code" href="../../d4/da4/def_8h.html#a0dfd02d7c09f9c698a5a7ecc0b7287ad">PP_HTONS</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a7f535a6efb5cdf86c3210e35ece1d6a7">TCP_WND</a>);</div>
<div class="line"><a name="l01369"></a><span class="lineno"> 1369</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l01370"></a><span class="lineno"> 1370</span>  tcphdr->chksum = 0;</div>
<div class="line"><a name="l01371"></a><span class="lineno"> 1371</span>  tcphdr->urgp = 0;</div>
<div class="line"><a name="l01372"></a><span class="lineno"> 1372</span>  </div>
<div class="line"><a name="l01373"></a><span class="lineno"> 1373</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.xmit);</div>
<div class="line"><a name="l01374"></a><span class="lineno"> 1374</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a237a8f1e47af42fb612e936e928a9ced">MIB2_STATS_INC</a>(mib2.tcpoutrsts);</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>  <a class="code" href="../../d2/dd6/structnetif.html">netif</a> = ip_route(local_ip, remote_ip);</div>
<div class="line"><a name="l01377"></a><span class="lineno"> 1377</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d2/dd6/structnetif.html">netif</a> != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01378"></a><span class="lineno"> 1378</span> <span class="preprocessor">#if CHECKSUM_GEN_TCP</span></div>
<div class="line"><a name="l01379"></a><span class="lineno"> 1379</span>  <a class="code" href="../../d9/d69/netif_8h.html#ad968df1b35c2fae368e087966e3bc677">IF__NETIF_CHECKSUM_ENABLED</a>(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, NETIF_CHECKSUM_GEN_TCP) {</div>
<div class="line"><a name="l01380"></a><span class="lineno"> 1380</span>  tcphdr->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="l01381"></a><span class="lineno"> 1381</span>  local_ip, remote_ip);</div>
<div class="line"><a name="l01382"></a><span class="lineno"> 1382</span>  }</div>
<div class="line"><a name="l01383"></a><span class="lineno"> 1383</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l01384"></a><span class="lineno"> 1384</span>  <span class="comment">/* Send output with hardcoded TTL/HL since we have no access to the pcb */</span></div>
<div class="line"><a name="l01385"></a><span class="lineno"> 1385</span>  ip_output_if(p, local_ip, remote_ip, <a class="code" href="../../d2/d78/lwipopts_8h.html#acd5b25ea81d2894790d25da5393cdab4">TCP_TTL</a>, 0, <a class="code" href="../../d4/d19/prot_2ip_8h.html#a634284ee3a136d6ad61bc5d917ebb82f">IP_PROTO_TCP</a>, <a class="code" href="../../d2/dd6/structnetif.html">netif</a>);</div>
<div class="line"><a name="l01386"></a><span class="lineno"> 1386</span>  }</div>
<div class="line"><a name="l01387"></a><span class="lineno"> 1387</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(p);</div>
<div class="line"><a name="l01388"></a><span class="lineno"> 1388</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_rst: seqno %"</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>, seqno, ackno));</div>
<div class="line"><a name="l01389"></a><span class="lineno"> 1389</span> }</div>
<div class="line"><a name="l01390"></a><span class="lineno"> 1390</span>  </div>
<div class="line"><a name="l01398"></a><span class="lineno"> 1398</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l01399"></a><span class="lineno"> 1399</span> tcp_rexmit_rto(<span class="keyword">struct</span> tcp_pcb *pcb)</div>
<div class="line"><a name="l01400"></a><span class="lineno"> 1400</span> {</div>
<div class="line"><a name="l01401"></a><span class="lineno"> 1401</span>  <span class="keyword">struct </span>tcp_seg *seg;</div>
<div class="line"><a name="l01402"></a><span class="lineno"> 1402</span>  </div>
<div class="line"><a name="l01403"></a><span class="lineno"> 1403</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="l01404"></a><span class="lineno"> 1404</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l01405"></a><span class="lineno"> 1405</span>  }</div>
<div class="line"><a name="l01406"></a><span class="lineno"> 1406</span>  </div>
<div class="line"><a name="l01407"></a><span class="lineno"> 1407</span>  <span class="comment">/* Move all unacked segments to the head of the unsent queue */</span></div>
<div class="line"><a name="l01408"></a><span class="lineno"> 1408</span>  <span class="keywordflow">for</span> (seg = pcb->unacked; seg->next != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>; seg = seg->next);</div>
<div class="line"><a name="l01409"></a><span class="lineno"> 1409</span>  <span class="comment">/* concatenate unsent queue after unacked queue */</span></div>
<div class="line"><a name="l01410"></a><span class="lineno"> 1410</span>  seg->next = pcb->unsent;</div>
<div class="line"><a name="l01411"></a><span class="lineno"> 1411</span> <span class="preprocessor">#if TCP_OVERSIZE_DBGCHECK</span></div>
<div class="line"><a name="l01412"></a><span class="lineno"> 1412</span>  <span class="comment">/* if last unsent changed, we need to update unsent_oversize */</span></div>
<div class="line"><a name="l01413"></a><span class="lineno"> 1413</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="l01414"></a><span class="lineno"> 1414</span>  pcb->unsent_oversize = seg->oversize_left;</div>
<div class="line"><a name="l01415"></a><span class="lineno"> 1415</span>  }</div>
<div class="line"><a name="l01416"></a><span class="lineno"> 1416</span> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE_DBGCHECK */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01417"></a><span class="lineno"> 1417</span>  <span class="comment">/* unsent queue is the concatenated queue (of unacked, unsent) */</span></div>
<div class="line"><a name="l01418"></a><span class="lineno"> 1418</span>  pcb->unsent = pcb->unacked;</div>
<div class="line"><a name="l01419"></a><span class="lineno"> 1419</span>  <span class="comment">/* unacked queue is now empty */</span></div>
<div class="line"><a name="l01420"></a><span class="lineno"> 1420</span>  pcb->unacked = <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>  </div>
<div class="line"><a name="l01422"></a><span class="lineno"> 1422</span>  <span class="comment">/* increment number of retransmissions */</span></div>
<div class="line"><a name="l01423"></a><span class="lineno"> 1423</span>  <span class="keywordflow">if</span> (pcb->nrtx < 0xFF) {</div>
<div class="line"><a name="l01424"></a><span class="lineno"> 1424</span>  ++pcb->nrtx;</div>
<div class="line"><a name="l01425"></a><span class="lineno"> 1425</span>  }</div>
<div class="line"><a name="l01426"></a><span class="lineno"> 1426</span>  </div>
<div class="line"><a name="l01427"></a><span class="lineno"> 1427</span>  <span class="comment">/* Don't take any RTT measurements after retransmitting. */</span></div>
<div class="line"><a name="l01428"></a><span class="lineno"> 1428</span>  pcb->rttest = 0;</div>
<div class="line"><a name="l01429"></a><span class="lineno"> 1429</span>  </div>
<div class="line"><a name="l01430"></a><span class="lineno"> 1430</span>  <span class="comment">/* Do the actual retransmission */</span></div>
<div class="line"><a name="l01431"></a><span class="lineno"> 1431</span>  tcp_output(pcb);</div>
<div class="line"><a name="l01432"></a><span class="lineno"> 1432</span> }</div>
<div class="line"><a name="l01433"></a><span class="lineno"> 1433</span>  </div>
<div class="line"><a name="l01441"></a><span class="lineno"> 1441</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l01442"></a><span class="lineno"> 1442</span> tcp_rexmit(<span class="keyword">struct</span> tcp_pcb *pcb)</div>
<div class="line"><a name="l01443"></a><span class="lineno"> 1443</span> {</div>
<div class="line"><a name="l01444"></a><span class="lineno"> 1444</span>  <span class="keyword">struct </span>tcp_seg *seg;</div>
<div class="line"><a name="l01445"></a><span class="lineno"> 1445</span>  <span class="keyword">struct </span>tcp_seg **cur_seg;</div>
<div class="line"><a name="l01446"></a><span class="lineno"> 1446</span>  </div>
<div class="line"><a name="l01447"></a><span class="lineno"> 1447</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="l01448"></a><span class="lineno"> 1448</span>  <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l01449"></a><span class="lineno"> 1449</span>  }</div>
<div class="line"><a name="l01450"></a><span class="lineno"> 1450</span>  </div>
<div class="line"><a name="l01451"></a><span class="lineno"> 1451</span>  <span class="comment">/* Move the first unacked segment to the unsent queue */</span></div>
<div class="line"><a name="l01452"></a><span class="lineno"> 1452</span>  <span class="comment">/* Keep the unsent queue sorted. */</span></div>
<div class="line"><a name="l01453"></a><span class="lineno"> 1453</span>  seg = pcb->unacked;</div>
<div class="line"><a name="l01454"></a><span class="lineno"> 1454</span>  pcb->unacked = seg->next;</div>
<div class="line"><a name="l01455"></a><span class="lineno"> 1455</span>  </div>
<div class="line"><a name="l01456"></a><span class="lineno"> 1456</span>  cur_seg = &(pcb->unsent);</div>
<div class="line"><a name="l01457"></a><span class="lineno"> 1457</span>  <span class="keywordflow">while</span> (*cur_seg &&</div>
<div class="line"><a name="l01458"></a><span class="lineno"> 1458</span>  TCP_SEQ_LT(<a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>((*cur_seg)->tcphdr->seqno), <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno))) {</div>
<div class="line"><a name="l01459"></a><span class="lineno"> 1459</span>  cur_seg = &((*cur_seg)->next );</div>
<div class="line"><a name="l01460"></a><span class="lineno"> 1460</span>  }</div>
<div class="line"><a name="l01461"></a><span class="lineno"> 1461</span>  seg->next = *cur_seg;</div>
<div class="line"><a name="l01462"></a><span class="lineno"> 1462</span>  *cur_seg = seg;</div>
<div class="line"><a name="l01463"></a><span class="lineno"> 1463</span> <span class="preprocessor">#if TCP_OVERSIZE</span></div>
<div class="line"><a name="l01464"></a><span class="lineno"> 1464</span>  <span class="keywordflow">if</span> (seg->next == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01465"></a><span class="lineno"> 1465</span>  <span class="comment">/* the retransmitted segment is last in unsent, so reset unsent_oversize */</span></div>
<div class="line"><a name="l01466"></a><span class="lineno"> 1466</span>  pcb->unsent_oversize = 0;</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> <span class="preprocessor">#endif </span><span class="comment">/* TCP_OVERSIZE */</span><span class="preprocessor"></span></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="keywordflow">if</span> (pcb->nrtx < 0xFF) {</div>
<div class="line"><a name="l01471"></a><span class="lineno"> 1471</span>  ++pcb->nrtx;</div>
<div class="line"><a name="l01472"></a><span class="lineno"> 1472</span>  }</div>
<div class="line"><a name="l01473"></a><span class="lineno"> 1473</span>  </div>
<div class="line"><a name="l01474"></a><span class="lineno"> 1474</span>  <span class="comment">/* Don't take any rtt measurements after retransmitting. */</span></div>
<div class="line"><a name="l01475"></a><span class="lineno"> 1475</span>  pcb->rttest = 0;</div>
<div class="line"><a name="l01476"></a><span class="lineno"> 1476</span>  </div>
<div class="line"><a name="l01477"></a><span class="lineno"> 1477</span>  <span class="comment">/* Do the actual retransmission. */</span></div>
<div class="line"><a name="l01478"></a><span class="lineno"> 1478</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a237a8f1e47af42fb612e936e928a9ced">MIB2_STATS_INC</a>(mib2.tcpretranssegs);</div>
<div class="line"><a name="l01479"></a><span class="lineno"> 1479</span>  <span class="comment">/* No need to call tcp_output: we are always called from tcp_input()</span></div>
<div class="line"><a name="l01480"></a><span class="lineno"> 1480</span> <span class="comment"> and thus tcp_output directly returns. */</span></div>
<div class="line"><a name="l01481"></a><span class="lineno"> 1481</span> }</div>
<div class="line"><a name="l01482"></a><span class="lineno"> 1482</span>  </div>
<div class="line"><a name="l01483"></a><span class="lineno"> 1483</span>  </div>
<div class="line"><a name="l01489"></a><span class="lineno"> 1489</span> <span class="keywordtype">void</span></div>
<div class="line"><a name="l01490"></a><span class="lineno"> 1490</span> tcp_rexmit_fast(<span class="keyword">struct</span> tcp_pcb *pcb)</div>
<div class="line"><a name="l01491"></a><span class="lineno"> 1491</span> {</div>
<div class="line"><a name="l01492"></a><span class="lineno"> 1492</span>  <span class="keywordflow">if</span> (pcb->unacked != <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a> && !(pcb->flags & TF_INFR)) {</div>
<div class="line"><a name="l01493"></a><span class="lineno"> 1493</span>  <span class="comment">/* This is fast retransmit. Retransmit the first unacked segment. */</span></div>
<div class="line"><a name="l01494"></a><span class="lineno"> 1494</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a5895bee26e8e1a0b89d597e0f2580b23">TCP_FR_DEBUG</a>,</div>
<div class="line"><a name="l01495"></a><span class="lineno"> 1495</span>  (<span class="stringliteral">"tcp_receive: dupacks %"</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#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a></div>
<div class="line"><a name="l01496"></a><span class="lineno"> 1496</span>  <span class="stringliteral">"), fast retransmit %"</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="l01497"></a><span class="lineno"> 1497</span>  (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)pcb->dupacks, pcb->lastack,</div>
<div class="line"><a name="l01498"></a><span class="lineno"> 1498</span>  <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(pcb->unacked->tcphdr->seqno)));</div>
<div class="line"><a name="l01499"></a><span class="lineno"> 1499</span>  tcp_rexmit(pcb);</div>
<div class="line"><a name="l01500"></a><span class="lineno"> 1500</span>  </div>
<div class="line"><a name="l01501"></a><span class="lineno"> 1501</span>  <span class="comment">/* Set ssthresh to half of the minimum of the current</span></div>
<div class="line"><a name="l01502"></a><span class="lineno"> 1502</span> <span class="comment"> * cwnd and the advertised window */</span></div>
<div class="line"><a name="l01503"></a><span class="lineno"> 1503</span>  pcb->ssthresh = <a class="code" href="../../d4/da4/def_8h.html#a748f5df614a3fc989e8900fd229d6e4e">LWIP_MIN</a>(pcb->cwnd, pcb->snd_wnd) / 2;</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>  <span class="comment">/* The minimum value for ssthresh should be 2 MSS */</span></div>
<div class="line"><a name="l01506"></a><span class="lineno"> 1506</span>  <span class="keywordflow">if</span> (pcb->ssthresh < (2U * pcb->mss)) {</div>
<div class="line"><a name="l01507"></a><span class="lineno"> 1507</span>  <a class="code" href="../../db/d16/debug_8h.html#a63a04edf7ff63c951bd8706711956cdb">LWIP_DEBUGF</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a5895bee26e8e1a0b89d597e0f2580b23">TCP_FR_DEBUG</a>,</div>
<div class="line"><a name="l01508"></a><span class="lineno"> 1508</span>  (<span class="stringliteral">"tcp_receive: The minimum value for ssthresh %"</span>TCPWNDSIZE_F</div>
<div class="line"><a name="l01509"></a><span class="lineno"> 1509</span>  <span class="stringliteral">" should be min 2 mss %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">"...\n"</span>,</div>
<div class="line"><a name="l01510"></a><span class="lineno"> 1510</span>  pcb->ssthresh, (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)(2*pcb->mss)));</div>
<div class="line"><a name="l01511"></a><span class="lineno"> 1511</span>  pcb->ssthresh = 2*pcb->mss;</div>
<div class="line"><a name="l01512"></a><span class="lineno"> 1512</span>  }</div>
<div class="line"><a name="l01513"></a><span class="lineno"> 1513</span>  </div>
<div class="line"><a name="l01514"></a><span class="lineno"> 1514</span>  pcb->cwnd = pcb->ssthresh + 3 * pcb->mss;</div>
<div class="line"><a name="l01515"></a><span class="lineno"> 1515</span>  pcb->flags |= TF_INFR;</div>
<div class="line"><a name="l01516"></a><span class="lineno"> 1516</span>  </div>
<div class="line"><a name="l01517"></a><span class="lineno"> 1517</span>  <span class="comment">/* Reset the retransmission timer to prevent immediate rto retransmissions */</span></div>
<div class="line"><a name="l01518"></a><span class="lineno"> 1518</span>  pcb->rtime = 0;</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> }</div>
<div class="line"><a name="l01521"></a><span class="lineno"> 1521</span>  </div>
<div class="line"><a name="l01522"></a><span class="lineno"> 1522</span>  </div>
<div class="line"><a name="l01531"></a><span class="lineno"> 1531</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a></div>
<div class="line"><a name="l01532"></a><span class="lineno"> 1532</span> tcp_keepalive(<span class="keyword">struct</span> tcp_pcb *pcb)</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>  <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err;</div>
<div class="line"><a name="l01535"></a><span class="lineno"> 1535</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p;</div>
<div class="line"><a name="l01536"></a><span class="lineno"> 1536</span>  <span class="keyword">struct </span><a class="code" href="../../d2/dd6/structnetif.html">netif</a> *<a class="code" href="../../d2/dd6/structnetif.html">netif</a>;</div>
<div class="line"><a name="l01537"></a><span class="lineno"> 1537</span>  </div>
<div class="line"><a name="l01538"></a><span class="lineno"> 1538</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_keepalive: sending KEEPALIVE probe to "</span>));</div>
<div class="line"><a name="l01539"></a><span class="lineno"> 1539</span>  <a class="code" href="../../de/df7/ip__addr_8h.html#af7d84bce2fb861a97f3047ecd69ab018">ip_addr_debug_print</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a4f43bb8a430c7a52a1ad5086d3f2803c">TCP_DEBUG</a>, &pcb->remote_ip);</div>
<div class="line"><a name="l01540"></a><span class="lineno"> 1540</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">"\n"</span>));</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>  <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_keepalive: tcp_ticks %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" pcb->tmr %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" pcb->keep_cnt_sent %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l01543"></a><span class="lineno"> 1543</span>  tcp_ticks, pcb->tmr, (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)pcb->keep_cnt_sent));</div>
<div class="line"><a name="l01544"></a><span class="lineno"> 1544</span>  </div>
<div class="line"><a name="l01545"></a><span class="lineno"> 1545</span>  p = tcp_output_alloc_header(pcb, 0, 0, <a class="code" href="../../d2/d6e/def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a>(pcb->snd_nxt - 1));</div>
<div class="line"><a name="l01546"></a><span class="lineno"> 1546</span>  <span class="keywordflow">if</span> (p == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01547"></a><span class="lineno"> 1547</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="l01548"></a><span class="lineno"> 1548</span>  (<span class="stringliteral">"tcp_keepalive: could not allocate memory for pbuf\n"</span>));</div>
<div class="line"><a name="l01549"></a><span class="lineno"> 1549</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaaaeafdbf3aecc46864daa3cd829c7e05">ERR_MEM</a>;</div>
<div class="line"><a name="l01550"></a><span class="lineno"> 1550</span>  }</div>
<div class="line"><a name="l01551"></a><span class="lineno"> 1551</span>  <a class="code" href="../../d2/dd6/structnetif.html">netif</a> = ip_route(&pcb->local_ip, &pcb->remote_ip);</div>
<div class="line"><a name="l01552"></a><span class="lineno"> 1552</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d2/dd6/structnetif.html">netif</a> == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01553"></a><span class="lineno"> 1553</span>  err = <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadca9448893187313c0c5a502ca9a9ad1c2a">ERR_RTE</a>;</div>
<div class="line"><a name="l01554"></a><span class="lineno"> 1554</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01555"></a><span class="lineno"> 1555</span> <span class="preprocessor">#if CHECKSUM_GEN_TCP</span></div>
<div class="line"><a name="l01556"></a><span class="lineno"> 1556</span>  <a class="code" href="../../d9/d69/netif_8h.html#ad968df1b35c2fae368e087966e3bc677">IF__NETIF_CHECKSUM_ENABLED</a>(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, NETIF_CHECKSUM_GEN_TCP) {</div>
<div class="line"><a name="l01557"></a><span class="lineno"> 1557</span>  <span class="keyword">struct </span><a class="code" href="../../db/df4/structtcp__hdr.html">tcp_hdr</a> *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="l01558"></a><span class="lineno"> 1558</span>  tcphdr->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="l01559"></a><span class="lineno"> 1559</span>  &pcb->local_ip, &pcb->remote_ip);</div>
<div class="line"><a name="l01560"></a><span class="lineno"> 1560</span>  }</div>
<div class="line"><a name="l01561"></a><span class="lineno"> 1561</span> <span class="preprocessor">#endif </span><span class="comment">/* CHECKSUM_GEN_TCP */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l01562"></a><span class="lineno"> 1562</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.xmit);</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>  <span class="comment">/* Send output to IP */</span></div>
<div class="line"><a name="l01565"></a><span class="lineno"> 1565</span>  <a class="code" href="../../d9/d69/netif_8h.html#ae1c22f1dab74a84d9e31316fd5fdfa11">NETIF_SET_HWADDRHINT</a>(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, &(pcb->addr_hint));</div>
<div class="line"><a name="l01566"></a><span class="lineno"> 1566</span>  err = ip_output_if(p, &pcb->local_ip, &pcb->remote_ip, pcb->ttl, 0, <a class="code" href="../../d4/d19/prot_2ip_8h.html#a634284ee3a136d6ad61bc5d917ebb82f">IP_PROTO_TCP</a>, <a class="code" href="../../d2/dd6/structnetif.html">netif</a>);</div>
<div class="line"><a name="l01567"></a><span class="lineno"> 1567</span>  <a class="code" href="../../d9/d69/netif_8h.html#ae1c22f1dab74a84d9e31316fd5fdfa11">NETIF_SET_HWADDRHINT</a>(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);</div>
<div class="line"><a name="l01568"></a><span class="lineno"> 1568</span>  }</div>
<div class="line"><a name="l01569"></a><span class="lineno"> 1569</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(p);</div>
<div class="line"><a name="l01570"></a><span class="lineno"> 1570</span>  </div>
<div class="line"><a name="l01571"></a><span class="lineno"> 1571</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_keepalive: seqno %"</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">" err %d.\n"</span>,</div>
<div class="line"><a name="l01572"></a><span class="lineno"> 1572</span>  pcb->snd_nxt - 1, pcb->rcv_nxt, (<span class="keywordtype">int</span>)err));</div>
<div class="line"><a name="l01573"></a><span class="lineno"> 1573</span>  <span class="keywordflow">return</span> err;</div>
<div class="line"><a name="l01574"></a><span class="lineno"> 1574</span> }</div>
<div class="line"><a name="l01575"></a><span class="lineno"> 1575</span>  </div>
<div class="line"><a name="l01576"></a><span class="lineno"> 1576</span>  </div>
<div class="line"><a name="l01585"></a><span class="lineno"> 1585</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a></div>
<div class="line"><a name="l01586"></a><span class="lineno"> 1586</span> tcp_zero_window_probe(<span class="keyword">struct</span> tcp_pcb *pcb)</div>
<div class="line"><a name="l01587"></a><span class="lineno"> 1587</span> {</div>
<div class="line"><a name="l01588"></a><span class="lineno"> 1588</span>  <a class="code" href="../../d2/de7/group__infrastructure__errors.html#gaf02d9da80fd66b4f986d2c53d7231ddb">err_t</a> err;</div>
<div class="line"><a name="l01589"></a><span class="lineno"> 1589</span>  <span class="keyword">struct </span><a class="code" href="../../d9/db8/structpbuf.html">pbuf</a> *p;</div>
<div class="line"><a name="l01590"></a><span class="lineno"> 1590</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="l01591"></a><span class="lineno"> 1591</span>  <span class="keyword">struct </span>tcp_seg *seg;</div>
<div class="line"><a name="l01592"></a><span class="lineno"> 1592</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> len;</div>
<div class="line"><a name="l01593"></a><span class="lineno"> 1593</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> is_fin;</div>
<div class="line"><a name="l01594"></a><span class="lineno"> 1594</span>  <a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> snd_nxt;</div>
<div class="line"><a name="l01595"></a><span class="lineno"> 1595</span>  <span class="keyword">struct </span><a class="code" href="../../d2/dd6/structnetif.html">netif</a> *<a class="code" href="../../d2/dd6/structnetif.html">netif</a>;</div>
<div class="line"><a name="l01596"></a><span class="lineno"> 1596</span>  </div>
<div class="line"><a name="l01597"></a><span class="lineno"> 1597</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_zero_window_probe: sending ZERO WINDOW probe to "</span>));</div>
<div class="line"><a name="l01598"></a><span class="lineno"> 1598</span>  <a class="code" href="../../de/df7/ip__addr_8h.html#af7d84bce2fb861a97f3047ecd69ab018">ip_addr_debug_print</a>(<a class="code" href="../../d2/d78/lwipopts_8h.html#a4f43bb8a430c7a52a1ad5086d3f2803c">TCP_DEBUG</a>, &pcb->remote_ip);</div>
<div class="line"><a name="l01599"></a><span class="lineno"> 1599</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">"\n"</span>));</div>
<div class="line"><a name="l01600"></a><span class="lineno"> 1600</span>  </div>
<div class="line"><a name="l01601"></a><span class="lineno"> 1601</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="l01602"></a><span class="lineno"> 1602</span>  (<span class="stringliteral">"tcp_zero_window_probe: tcp_ticks %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a></div>
<div class="line"><a name="l01603"></a><span class="lineno"> 1603</span>  <span class="stringliteral">" pcb->tmr %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" pcb->keep_cnt_sent %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gaa9d7f6eb2ee9fcc5eda3545dbb1886e0">U16_F</a><span class="stringliteral">"\n"</span>,</div>
<div class="line"><a name="l01604"></a><span class="lineno"> 1604</span>  tcp_ticks, pcb->tmr, (<a class="code" href="../../de/d8c/group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a>)pcb->keep_cnt_sent));</div>
<div class="line"><a name="l01605"></a><span class="lineno"> 1605</span>  </div>
<div class="line"><a name="l01606"></a><span class="lineno"> 1606</span>  seg = pcb->unacked;</div>
<div class="line"><a name="l01607"></a><span class="lineno"> 1607</span>  </div>
<div class="line"><a name="l01608"></a><span class="lineno"> 1608</span>  <span class="keywordflow">if</span> (seg == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01609"></a><span class="lineno"> 1609</span>  seg = pcb->unsent;</div>
<div class="line"><a name="l01610"></a><span class="lineno"> 1610</span>  }</div>
<div class="line"><a name="l01611"></a><span class="lineno"> 1611</span>  <span class="keywordflow">if</span> (seg == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01612"></a><span class="lineno"> 1612</span>  <span class="comment">/* nothing to send, zero window probe not needed */</span></div>
<div class="line"><a name="l01613"></a><span class="lineno"> 1613</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="l01614"></a><span class="lineno"> 1614</span>  }</div>
<div class="line"><a name="l01615"></a><span class="lineno"> 1615</span>  </div>
<div class="line"><a name="l01616"></a><span class="lineno"> 1616</span>  is_fin = ((<a class="code" href="../../d9/d67/prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5">TCPH_FLAGS</a>(seg->tcphdr) & <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>) != 0) && (seg->len == 0);</div>
<div class="line"><a name="l01617"></a><span class="lineno"> 1617</span>  <span class="comment">/* we want to send one seqno: either FIN or data (no options) */</span></div>
<div class="line"><a name="l01618"></a><span class="lineno"> 1618</span>  len = is_fin ? 0 : 1;</div>
<div class="line"><a name="l01619"></a><span class="lineno"> 1619</span>  </div>
<div class="line"><a name="l01620"></a><span class="lineno"> 1620</span>  p = tcp_output_alloc_header(pcb, 0, len, seg->tcphdr->seqno);</div>
<div class="line"><a name="l01621"></a><span class="lineno"> 1621</span>  <span class="keywordflow">if</span> (p == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01622"></a><span class="lineno"> 1622</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_zero_window_probe: no memory for pbuf\n"</span>));</div>
<div class="line"><a name="l01623"></a><span class="lineno"> 1623</span>  <span class="keywordflow">return</span> <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcaaaeafdbf3aecc46864daa3cd829c7e05">ERR_MEM</a>;</div>
<div class="line"><a name="l01624"></a><span class="lineno"> 1624</span>  }</div>
<div class="line"><a name="l01625"></a><span class="lineno"> 1625</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="l01626"></a><span class="lineno"> 1626</span>  </div>
<div class="line"><a name="l01627"></a><span class="lineno"> 1627</span>  if (is_fin) {</div>
<div class="line"><a name="l01628"></a><span class="lineno"> 1628</span>  <span class="comment">/* FIN segment, no data */</span></div>
<div class="line"><a name="l01629"></a><span class="lineno"> 1629</span>  <a class="code" href="../../d9/d67/prot_2tcp_8h.html#afe7c917080459557c65071c4b13c8e12">TCPH_FLAGS_SET</a>(tcphdr, <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef">TCP_ACK</a> | <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743">TCP_FIN</a>);</div>
<div class="line"><a name="l01630"></a><span class="lineno"> 1630</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01631"></a><span class="lineno"> 1631</span>  <span class="comment">/* Data segment, copy in one byte from the head of the unacked queue */</span></div>
<div class="line"><a name="l01632"></a><span class="lineno"> 1632</span>  <span class="keywordtype">char</span> *d = ((<span class="keywordtype">char</span> *)p-><a class="code" href="../../d9/db8/structpbuf.html#a8d32dc3e964369d4eec638fc37fbc460">payload</a> + <a class="code" href="../../d9/d67/prot_2tcp_8h.html#a5758db371d6daa394d178429b7c94c2a">TCP_HLEN</a>);</div>
<div class="line"><a name="l01633"></a><span class="lineno"> 1633</span>  <span class="comment">/* Depending on whether the segment has already been sent (unacked) or not</span></div>
<div class="line"><a name="l01634"></a><span class="lineno"> 1634</span> <span class="comment"> (unsent), seg->p->payload points to the IP header or TCP header.</span></div>
<div class="line"><a name="l01635"></a><span class="lineno"> 1635</span> <span class="comment"> Ensure we copy the first TCP data byte: */</span></div>
<div class="line"><a name="l01636"></a><span class="lineno"> 1636</span>  <a class="code" href="../../d7/d05/group__pbuf.html#gac2f1f58fd36042e82af46f5015720899">pbuf_copy_partial</a>(seg->p, d, 1, seg->p->tot_len - seg->len);</div>
<div class="line"><a name="l01637"></a><span class="lineno"> 1637</span>  }</div>
<div class="line"><a name="l01638"></a><span class="lineno"> 1638</span>  </div>
<div class="line"><a name="l01639"></a><span class="lineno"> 1639</span>  <span class="comment">/* The byte may be acknowledged without the window being opened. */</span></div>
<div class="line"><a name="l01640"></a><span class="lineno"> 1640</span>  snd_nxt = <a class="code" href="../../d4/da4/def_8h.html#a56098407d66feb75806f655bafbee81d">lwip_ntohl</a>(seg->tcphdr->seqno) + 1;</div>
<div class="line"><a name="l01641"></a><span class="lineno"> 1641</span>  <span class="keywordflow">if</span> (TCP_SEQ_LT(pcb->snd_nxt, snd_nxt)) {</div>
<div class="line"><a name="l01642"></a><span class="lineno"> 1642</span>  pcb->snd_nxt = snd_nxt;</div>
<div class="line"><a name="l01643"></a><span class="lineno"> 1643</span>  }</div>
<div class="line"><a name="l01644"></a><span class="lineno"> 1644</span>  </div>
<div class="line"><a name="l01645"></a><span class="lineno"> 1645</span>  <a class="code" href="../../d2/dd6/structnetif.html">netif</a> = ip_route(&pcb->local_ip, &pcb->remote_ip);</div>
<div class="line"><a name="l01646"></a><span class="lineno"> 1646</span>  <span class="keywordflow">if</span> (<a class="code" href="../../d2/dd6/structnetif.html">netif</a> == <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>) {</div>
<div class="line"><a name="l01647"></a><span class="lineno"> 1647</span>  err = <a class="code" href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadca9448893187313c0c5a502ca9a9ad1c2a">ERR_RTE</a>;</div>
<div class="line"><a name="l01648"></a><span class="lineno"> 1648</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l01649"></a><span class="lineno"> 1649</span> <span class="preprocessor">#if CHECKSUM_GEN_TCP</span></div>
<div class="line"><a name="l01650"></a><span class="lineno"> 1650</span>  <a class="code" href="../../d9/d69/netif_8h.html#ad968df1b35c2fae368e087966e3bc677">IF__NETIF_CHECKSUM_ENABLED</a>(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, NETIF_CHECKSUM_GEN_TCP) {</div>
<div class="line"><a name="l01651"></a><span class="lineno"> 1651</span>  tcphdr->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="l01652"></a><span class="lineno"> 1652</span>  &pcb->local_ip, &pcb->remote_ip);</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="preprocessor">#endif</span></div>
<div class="line"><a name="l01655"></a><span class="lineno"> 1655</span>  <a class="code" href="../../d9/d9b/stats_8h.html#a33fdaa705af04fb9a82f1cf0ba21091d">TCP_STATS_INC</a>(tcp.xmit);</div>
<div class="line"><a name="l01656"></a><span class="lineno"> 1656</span>  </div>
<div class="line"><a name="l01657"></a><span class="lineno"> 1657</span>  <span class="comment">/* Send output to IP */</span></div>
<div class="line"><a name="l01658"></a><span class="lineno"> 1658</span>  <a class="code" href="../../d9/d69/netif_8h.html#ae1c22f1dab74a84d9e31316fd5fdfa11">NETIF_SET_HWADDRHINT</a>(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, &(pcb->addr_hint));</div>
<div class="line"><a name="l01659"></a><span class="lineno"> 1659</span>  err = ip_output_if(p, &pcb->local_ip, &pcb->remote_ip, pcb->ttl,</div>
<div class="line"><a name="l01660"></a><span class="lineno"> 1660</span>  0, <a class="code" href="../../d4/d19/prot_2ip_8h.html#a634284ee3a136d6ad61bc5d917ebb82f">IP_PROTO_TCP</a>, <a class="code" href="../../d2/dd6/structnetif.html">netif</a>);</div>
<div class="line"><a name="l01661"></a><span class="lineno"> 1661</span>  <a class="code" href="../../d9/d69/netif_8h.html#ae1c22f1dab74a84d9e31316fd5fdfa11">NETIF_SET_HWADDRHINT</a>(<a class="code" href="../../d2/dd6/structnetif.html">netif</a>, <a class="code" href="../../d6/d8a/fat__string_8h.html#a070d2ce7b6bb7e5c05602aa8c308d0c4">NULL</a>);</div>
<div class="line"><a name="l01662"></a><span class="lineno"> 1662</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>  <a class="code" href="../../d7/d05/group__pbuf.html#gab0dd696fb4b6bc65e548944584f1738b">pbuf_free</a>(p);</div>
<div class="line"><a name="l01665"></a><span class="lineno"> 1665</span>  </div>
<div class="line"><a name="l01666"></a><span class="lineno"> 1666</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_zero_window_probe: seqno %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a></div>
<div class="line"><a name="l01667"></a><span class="lineno"> 1667</span>  <span class="stringliteral">" ackno %"</span><a class="code" href="../../de/d8c/group__compiler__abstraction.html#gad8b0a364e95b07cb0c47709fdc6037d6">U32_F</a><span class="stringliteral">" err %d.\n"</span>,</div>
<div class="line"><a name="l01668"></a><span class="lineno"> 1668</span>  pcb->snd_nxt - 1, pcb->rcv_nxt, (<span class="keywordtype">int</span>)err));</div>
<div class="line"><a name="l01669"></a><span class="lineno"> 1669</span>  <span class="keywordflow">return</span> err;</div>
<div class="line"><a name="l01670"></a><span class="lineno"> 1670</span> }</div>
<div class="line"><a name="l01671"></a><span class="lineno"> 1671</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="asys_8h_html"><div class="ttname"><a href="../../d9/d87/sys_8h.html">sys.h</a></div></div>
<div class="ttc" id="agroup__compiler__abstraction_html_gac05a82d37afb251470f5e17ca15ab6e9"><div class="ttname"><a href="../../de/d8c/group__compiler__abstraction.html#gac05a82d37afb251470f5e17ca15ab6e9">S16_F</a></div><div class="ttdeci">#define S16_F</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d2d/arch_8h_source.html#l00151">arch.h:151</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="aopt_8h_html"><div class="ttname"><a href="../../dc/dba/opt_8h.html">opt.h</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="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__pbuf_html_ggab7e0e32fcc292c0d7107721766ed92fbac120b0fe39efe35bb682e4aa3b82e2c9"><div class="ttname"><a href="../../d7/d05/group__pbuf.html#ggab7e0e32fcc292c0d7107721766ed92fbac120b0fe39efe35bb682e4aa3b82e2c9">PBUF_ROM</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00112">pbuf.h:112</a></div></div>
<div class="ttc" id="agroup__pbuf_html_ggaee1baa59bb2f85ba575b5a8619ac1ebfa21116654fbab6d5a4dfeb87a1bb8f0ba"><div class="ttname"><a href="../../d7/d05/group__pbuf.html#ggaee1baa59bb2f85ba575b5a8619ac1ebfa21116654fbab6d5a4dfeb87a1bb8f0ba">PBUF_RAW</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00094">pbuf.h:94</a></div></div>
<div class="ttc" id="agroup__debugging__levels_html_gaab41143277cd38047b6660d90e9cec3b"><div class="ttname"><a href="../../d6/d7a/group__debugging__levels.html#gaab41143277cd38047b6660d90e9cec3b">LWIP_DBG_LEVEL_SEVERE</a></div><div class="ttdeci">#define LWIP_DBG_LEVEL_SEVERE</div><div class="ttdef"><b>Definition:</b> <a href="../../db/d16/debug_8h_source.html#l00059">debug.h:59</a></div></div>
<div class="ttc" id="agroup__infrastructure__errors_html_ggae2e66c7d13afc90ffecd6151680fbadca05c91366f1b5203a5db9a241b415cd63"><div class="ttname"><a href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadca05c91366f1b5203a5db9a241b415cd63">ERR_BUF</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d40/err_8h_source.html#l00067">err.h:67</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="astring_8h_html"><div class="ttname"><a href="../../da/d66/string_8h.html">string.h</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="agroup__pbuf_html_ggaee1baa59bb2f85ba575b5a8619ac1ebfafcc1e506061ba69dfa142eb6b3da5f13"><div class="ttname"><a href="../../d7/d05/group__pbuf.html#ggaee1baa59bb2f85ba575b5a8619ac1ebfafcc1e506061ba69dfa142eb6b3da5f13">PBUF_IP</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00080">pbuf.h:80</a></div></div>
<div class="ttc" id="alwipopts_8h_html_a5895bee26e8e1a0b89d597e0f2580b23"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#a5895bee26e8e1a0b89d597e0f2580b23">TCP_FR_DEBUG</a></div><div class="ttdeci">#define TCP_FR_DEBUG</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00467">lwipopts.h:467</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="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="astructpbuf__rom_html"><div class="ttname"><a href="../../df/d33/structpbuf__rom.html">pbuf_rom</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00180">pbuf.h:180</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_ggaee1baa59bb2f85ba575b5a8619ac1ebfa2ded3594a3977f8bf9cf09552be327b5"><div class="ttname"><a href="../../d7/d05/group__pbuf.html#ggaee1baa59bb2f85ba575b5a8619ac1ebfa2ded3594a3977f8bf9cf09552be327b5">PBUF_TRANSPORT</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00076">pbuf.h:76</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="ainet__chksum_8h_html_acfe7ab6c63ef998210c66bb4822b03b2"><div class="ttname"><a href="../../d2/d45/inet__chksum_8h.html#acfe7ab6c63ef998210c66bb4822b03b2">ip_chksum_pseudo_partial</a></div><div class="ttdeci">u16_t ip_chksum_pseudo_partial(struct pbuf *p, u8_t proto, u16_t proto_len, u16_t chksum_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#l00526">inet_chksum.c:526</a></div></div>
<div class="ttc" id="amemp_8h_html_a2b00593d086313c267b54a976bf67aa5"><div class="ttname"><a href="../../df/dff/memp_8h.html#a2b00593d086313c267b54a976bf67aa5">memp_malloc</a></div><div class="ttdeci">void * memp_malloc(memp_t type)</div><div class="ttdef"><b>Definition:</b> <a href="../../d1/d70/memp_8c_source.html#l00385">memp.c:385</a></div></div>
<div class="ttc" id="agroup__debugging__levels_html_ga988147559b78642ac881815b66023646"><div class="ttname"><a href="../../d6/d7a/group__debugging__levels.html#ga988147559b78642ac881815b66023646">LWIP_DBG_TRACE</a></div><div class="ttdeci">#define LWIP_DBG_TRACE</div><div class="ttdef"><b>Definition:</b> <a href="../../db/d16/debug_8h_source.html#l00083">debug.h:83</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="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="anetif_8h_html_ae1c22f1dab74a84d9e31316fd5fdfa11"><div class="ttname"><a href="../../d9/d69/netif_8h.html#ae1c22f1dab74a84d9e31316fd5fdfa11">NETIF_SET_HWADDRHINT</a></div><div class="ttdeci">#define NETIF_SET_HWADDRHINT(netif, hint)</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d69/netif_8h_source.html#l00475">netif.h:475</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="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="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="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="ainet__chksum_8h_html_a0196bd603262882d16b5264b52eafe18"><div class="ttname"><a href="../../d2/d45/inet__chksum_8h.html#a0196bd603262882d16b5264b52eafe18">SWAP_BYTES_IN_WORD</a></div><div class="ttdeci">#define SWAP_BYTES_IN_WORD(w)</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d45/inet__chksum_8h_source.html#l00047">inet_chksum.h:47</a></div></div>
<div class="ttc" id="aip__addr_8h_html_af7d84bce2fb861a97f3047ecd69ab018"><div class="ttname"><a href="../../de/df7/ip__addr_8h.html#af7d84bce2fb861a97f3047ecd69ab018">ip_addr_debug_print</a></div><div class="ttdeci">#define ip_addr_debug_print(debug, ipaddr)</div><div class="ttdef"><b>Definition:</b> <a href="../../de/df7/ip__addr_8h_source.html#l00323">ip_addr.h:323</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="agroup__pbuf_html_gac2f1f58fd36042e82af46f5015720899"><div class="ttname"><a href="../../d7/d05/group__pbuf.html#gac2f1f58fd36042e82af46f5015720899">pbuf_copy_partial</a></div><div class="ttdeci">u16_t pbuf_copy_partial(const struct pbuf *p, void *dataptr, u16_t len, u16_t offset)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/df0/pbuf_8c_source.html#l01016">pbuf.c:1016</a></div></div>
<div class="ttc" id="agroup__debugging__levels_html_ga0269bdc51f1e8a5ecf9af72c6e1c996c"><div class="ttname"><a href="../../d6/d7a/group__debugging__levels.html#ga0269bdc51f1e8a5ecf9af72c6e1c996c">LWIP_DBG_LEVEL_SERIOUS</a></div><div class="ttdeci">#define LWIP_DBG_LEVEL_SERIOUS</div><div class="ttdef"><b>Definition:</b> <a href="../../db/d16/debug_8h_source.html#l00057">debug.h:57</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__sys__time_html_ga11316ac1e77418c6fa4ab8869e3fa199"><div class="ttname"><a href="../../d3/dc4/group__sys__time.html#ga11316ac1e77418c6fa4ab8869e3fa199">sys_now</a></div><div class="ttdeci">u32_t sys_now(void)</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d56/sys__arch_8c_source.html#l00496">sys_arch.c:496</a></div></div>
<div class="ttc" id="adebug_8h_html_a827bc03cd7889e7c007df39d33b33d18"><div class="ttname"><a href="../../db/d16/debug_8h.html#a827bc03cd7889e7c007df39d33b33d18">LWIP_ERROR</a></div><div class="ttdeci">#define LWIP_ERROR(message, expression, handler)</div><div class="ttdef"><b>Definition:</b> <a href="../../db/d16/debug_8h_source.html#l00135">debug.h:135</a></div></div>
<div class="ttc" id="alwipopts_8h_html_a9beaa47832ead4180981bfbf71074904"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#a9beaa47832ead4180981bfbf71074904">TCP_SND_QUEUELEN</a></div><div class="ttdeci">#define TCP_SND_QUEUELEN</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00186">lwipopts.h:186</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="alwipopts_8h_html_a9f70601fdc1feee490772bf7fcdb74fb"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#a9f70601fdc1feee490772bf7fcdb74fb">TCP_OUTPUT_DEBUG</a></div><div class="ttdeci">#define TCP_OUTPUT_DEBUG</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00475">lwipopts.h:475</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__pbuf_html_gacfcb0a2af918658ba0afe36499c65f47"><div class="ttname"><a href="../../d7/d05/group__pbuf.html#gacfcb0a2af918658ba0afe36499c65f47">pbuf_alloc</a></div><div class="ttdeci">struct pbuf * pbuf_alloc(pbuf_layer l, u16_t length, pbuf_type type)</div><div class="ttdef"><b>Definition:</b> <a href="../../d8/df0/pbuf_8c_source.html#l00248">pbuf.c:248</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="aip__addr_8h_html_a88b43639738c4de2d3cd22e3a1fd7696"><div class="ttname"><a href="../../de/df7/ip__addr_8h.html#a88b43639738c4de2d3cd22e3a1fd7696">ip_addr_t</a></div><div class="ttdeci">ip6_addr_t ip_addr_t</div><div class="ttdef"><b>Definition:</b> <a href="../../de/df7/ip__addr_8h_source.html#l00290">ip_addr.h:290</a></div></div>
<div class="ttc" id="agroup__infrastructure__errors_html_ggae2e66c7d13afc90ffecd6151680fbadcab0036c51817b5200bfe8157cc4115b27"><div class="ttname"><a href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcab0036c51817b5200bfe8157cc4115b27">ERR_CONN</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d40/err_8h_source.html#l00085">err.h:85</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="agroup__pbuf_html_gaee1baa59bb2f85ba575b5a8619ac1ebf"><div class="ttname"><a href="../../d7/d05/group__pbuf.html#gaee1baa59bb2f85ba575b5a8619ac1ebf">pbuf_layer</a></div><div class="ttdeci">pbuf_layer</div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00072">pbuf.h:72</a></div></div>
<div class="ttc" id="agroup__compiler__abstraction_html_gaef204be511fd32f681b55abc08e9ae18"><div class="ttname"><a href="../../de/d8c/group__compiler__abstraction.html#gaef204be511fd32f681b55abc08e9ae18">LWIP_MEM_ALIGN_SIZE</a></div><div class="ttdeci">#define LWIP_MEM_ALIGN_SIZE(size)</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d2d/arch_8h_source.html#l00221">arch.h:221</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="adef_8h_html_a21ea174d374106caeafb4aa3a24fbd2b"><div class="ttname"><a href="../../d4/da4/def_8h.html#a21ea174d374106caeafb4aa3a24fbd2b">LWIP_MAX</a></div><div class="ttdeci">#define LWIP_MAX(x, y)</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/da4/def_8h_source.html#l00054">def.h:54</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__infrastructure__errors_html_ggae2e66c7d13afc90ffecd6151680fbadcab508ce0ebdf3ca735208b00a80a45c91"><div class="ttname"><a href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadcab508ce0ebdf3ca735208b00a80a45c91">ERR_ARG</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d40/err_8h_source.html#l00096">err.h:96</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="adef_8c_html_a14f94347a5b9b9e3602705b75b7ae524"><div class="ttname"><a href="../../d2/d6e/def_8c.html#a14f94347a5b9b9e3602705b75b7ae524">lwip_htonl</a></div><div class="ttdeci">u32_t lwip_htonl(u32_t n)</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d6e/def_8c_source.html#l00088">def.c:88</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="adef_8c_html_ad637280639de4066392e6b5614fa3e56"><div class="ttname"><a href="../../d2/d6e/def_8c.html#ad637280639de4066392e6b5614fa3e56">lwip_htons</a></div><div class="ttdeci">u16_t lwip_htons(u16_t n)</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d6e/def_8c_source.html#l00075">def.c:75</a></div></div>
<div class="ttc" id="alwipopts_8h_html_a97343214666ee6dcb18c0bd77b441ea7"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#a97343214666ee6dcb18c0bd77b441ea7">MEM_ALIGNMENT</a></div><div class="ttdeci">#define MEM_ALIGNMENT</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00054">lwipopts.h:54</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="agroup__pbuf_html_ggab7e0e32fcc292c0d7107721766ed92fbac5e9f28455bca98944a030d4b84ecfab"><div class="ttname"><a href="../../d7/d05/group__pbuf.html#ggab7e0e32fcc292c0d7107721766ed92fbac5e9f28455bca98944a030d4b84ecfab">PBUF_RAM</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00108">pbuf.h:108</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="agroup__compiler__abstraction_html_gaf019cbb71af10dcfda7758b21e655307"><div class="ttname"><a href="../../de/d8c/group__compiler__abstraction.html#gaf019cbb71af10dcfda7758b21e655307">mem_ptr_t</a></div><div class="ttdeci">uintptr_t mem_ptr_t</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d2d/arch_8h_source.html#l00128">arch.h:128</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="alwipopts_8h_html_acd5b25ea81d2894790d25da5393cdab4"><div class="ttname"><a href="../../d2/d78/lwipopts_8h.html#acd5b25ea81d2894790d25da5393cdab4">TCP_TTL</a></div><div class="ttdeci">#define TCP_TTL</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d78/lwipopts_8h_source.html#l00171">lwipopts.h:171</a></div></div>
<div class="ttc" id="ainet__chksum_8h_html_a34f1aa1587562a09e11b704b51bab043"><div class="ttname"><a href="../../d2/d45/inet__chksum_8h.html#a34f1aa1587562a09e11b704b51bab043">inet_chksum</a></div><div class="ttdeci">u16_t inet_chksum(const void *dataptr, u16_t len)</div><div class="ttdef"><b>Definition:</b> <a href="../../da/d81/inet__chksum_8c_source.html#l00555">inet_chksum.c:555</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="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="astructpbuf_html_afd7bff5210a022424caa97d2f25fe8e6"><div class="ttname"><a href="../../d9/db8/structpbuf.html#afd7bff5210a022424caa97d2f25fe8e6">pbuf::type</a></div><div class="ttdeci">u8_t type</div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d35/pbuf_8h_source.html#l00162">pbuf.h:162</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="aprot_2tcp_8h_html_a57fb29aed8df21ccff4481612ee40407"><div class="ttname"><a href="../../d9/d67/prot_2tcp_8h.html#a57fb29aed8df21ccff4481612ee40407">TCPH_HDRLEN_FLAGS_SET</a></div><div class="ttdeci">#define TCPH_HDRLEN_FLAGS_SET(phdr, len, flags)</div><div class="ttdef"><b>Definition:</b> <a href="../../d9/d67/prot_2tcp_8h_source.html#l00088">tcp.h:88</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="adef_8h_html_afea9c21aa1f56180cdf6fb42ef14a294"><div class="ttname"><a href="../../d4/da4/def_8h.html#afea9c21aa1f56180cdf6fb42ef14a294">PP_HTONL</a></div><div class="ttdeci">#define PP_HTONL(x)</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/da4/def_8h_source.html#l00081">def.h:81</a></div></div>
<div class="ttc" id="agroup__infrastructure__errors_html_ggae2e66c7d13afc90ffecd6151680fbadca9448893187313c0c5a502ca9a9ad1c2a"><div class="ttname"><a href="../../d2/de7/group__infrastructure__errors.html#ggae2e66c7d13afc90ffecd6151680fbadca9448893187313c0c5a502ca9a9ad1c2a">ERR_RTE</a></div><div class="ttdef"><b>Definition:</b> <a href="../../d6/d40/err_8h_source.html#l00071">err.h:71</a></div></div>
<div class="ttc" id="ainet__chksum_8h_html_a6ffe83b4bdd1784a0671ee4778966a01"><div class="ttname"><a href="../../d2/d45/inet__chksum_8h.html#a6ffe83b4bdd1784a0671ee4778966a01">FOLD_U32T</a></div><div class="ttdeci">#define FOLD_U32T(u)</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d45/inet__chksum_8h_source.html#l00052">inet_chksum.h:52</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="agroup__debugging__levels_html_ga511ee3deb3240635f5ec6a1709c6d741"><div class="ttname"><a href="../../d6/d7a/group__debugging__levels.html#ga511ee3deb3240635f5ec6a1709c6d741">LWIP_DBG_STATE</a></div><div class="ttdeci">#define LWIP_DBG_STATE</div><div class="ttdef"><b>Definition:</b> <a href="../../db/d16/debug_8h_source.html#l00085">debug.h:85</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="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="adef_8h_html_a0dfd02d7c09f9c698a5a7ecc0b7287ad"><div class="ttname"><a href="../../d4/da4/def_8h.html#a0dfd02d7c09f9c698a5a7ecc0b7287ad">PP_HTONS</a></div><div class="ttdeci">#define PP_HTONS(x)</div><div class="ttdef"><b>Definition:</b> <a href="../../d4/da4/def_8h_source.html#l00079">def.h:79</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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