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<div class="title">tcp.h</div> </div>
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<div class="contents">
<a href="prot_2tcp_8h.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="l00006"></a><span class="lineno"> 6</span> <span class="comment">/*</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * Copyright (c) 2001-2004 Swedish Institute of Computer Science.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * All rights reserved.</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"> * Redistribution and use in source and binary forms, with or without modification,</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * are permitted provided that the following conditions are met:</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"> * 1. Redistributions of source code must retain the above copyright notice,</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * this list of conditions and the following disclaimer.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright notice,</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * this list of conditions and the following disclaimer in the documentation</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * and/or other materials provided with the distribution.</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</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="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * derived from this software without specific prior written permission.</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</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="l00022"></a><span class="lineno"> 22</span> <span class="comment"> * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment"> * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment"> * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment"> * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment"> * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</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="l00030"></a><span class="lineno"> 30</span> <span class="comment"> * OF SUCH DAMAGE.</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="comment"> * This file is part of the lwIP TCP/IP stack.</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="comment"> *</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment"> * Author: Adam Dunkels <adam@sics.se></span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment"> *</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="preprocessor">#ifndef LWIP_HDR_PROT_TCP_H</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#define LWIP_HDR_PROT_TCP_H</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  </div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#include "<a class="code" href="arch_8h.html">net/arch.h</a>"</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  </div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="keyword">extern</span> <span class="stringliteral">"C"</span> {</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  </div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment">/* Length of the TCP header, excluding options. */</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#a5758db371d6daa394d178429b7c94c2a"> 47</a></span> <span class="preprocessor">#define TCP_HLEN 20</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  </div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="comment">/* Fields are (of course) in network byte order.</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span> <span class="comment"> * Some fields are converted to host byte order in tcp_input().</span></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment"> */</span></div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="preprocessor">#ifdef PACK_STRUCT_USE_INCLUDES</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="preprocessor"># include "arch/bpstruct.h"</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <a class="code" href="cc_8h.html#a73199061891adf1b912d20835c7d5e96">PACK_STRUCT_BEGIN</a></div>
<div class="line"><a name="l00056"></a><span class="lineno"><a class="line" href="structtcp__hdr.html"> 56</a></span> <span class="keyword">struct </span><a class="code" href="structtcp__hdr.html">tcp_hdr</a> {</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <a class="code" href="structtcp__hdr.html#ac2319bd25c4548055230b4a00052d715">PACK_STRUCT_FIELD</a>(<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> src);</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <a class="code" href="structtcp__hdr.html#ac2319bd25c4548055230b4a00052d715">PACK_STRUCT_FIELD</a>(<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> dest);</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <a class="code" href="structtcp__hdr.html#ac2319bd25c4548055230b4a00052d715">PACK_STRUCT_FIELD</a>(<a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> seqno);</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  <a class="code" href="structtcp__hdr.html#ac2319bd25c4548055230b4a00052d715">PACK_STRUCT_FIELD</a>(<a class="code" href="group__compiler__abstraction.html#ga4c14294869aceba3ef9d4c0c302d0f33">u32_t</a> ackno);</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <a class="code" href="structtcp__hdr.html#ac2319bd25c4548055230b4a00052d715">PACK_STRUCT_FIELD</a>(<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> _hdrlen_rsvd_flags);</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <a class="code" href="structtcp__hdr.html#ac2319bd25c4548055230b4a00052d715">PACK_STRUCT_FIELD</a>(<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> wnd);</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <a class="code" href="structtcp__hdr.html#ac2319bd25c4548055230b4a00052d715">PACK_STRUCT_FIELD</a>(<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> chksum);</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <a class="code" href="structtcp__hdr.html#ac2319bd25c4548055230b4a00052d715">PACK_STRUCT_FIELD</a>(<a class="code" href="group__compiler__abstraction.html#ga77570ac4fcab86864fa1916e55676da2">u16_t</a> urgp);</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> } <a class="code" href="prot_2tcp_8h.html#a29212dd70e32fb34e4db4ea46fe8cfdb">PACK_STRUCT_STRUCT</a>;</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <a class="code" href="cc_8h.html#a465fef70f294e21cbf4ea51fc342f20e">PACK_STRUCT_END</a></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="preprocessor">#ifdef PACK_STRUCT_USE_INCLUDES</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="preprocessor"># include "arch/epstruct.h"</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  </div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> <span class="comment">/* TCP header flags bits */</span></div>
<div class="line"><a name="l00072"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#a88e60aa2cf23e1c65d630701db08c743"> 72</a></span> <span class="preprocessor">#define TCP_FIN 0x01U</span></div>
<div class="line"><a name="l00073"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#a6020613f5062417d9811cfa837215c83"> 73</a></span> <span class="preprocessor">#define TCP_SYN 0x02U</span></div>
<div class="line"><a name="l00074"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#a5ca559def464ef20d8b1f7d32f2f160d"> 74</a></span> <span class="preprocessor">#define TCP_RST 0x04U</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#a1320fd0006a2f70138bc2d0018dda829"> 75</a></span> <span class="preprocessor">#define TCP_PSH 0x08U</span></div>
<div class="line"><a name="l00076"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#a44b3b1ab31a403ba28ec135adfcbefef"> 76</a></span> <span class="preprocessor">#define TCP_ACK 0x10U</span></div>
<div class="line"><a name="l00077"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#ac84f499cba8a02fc0e306c10b2acabf0"> 77</a></span> <span class="preprocessor">#define TCP_URG 0x20U</span></div>
<div class="line"><a name="l00078"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#ae6ba06711820fc4365ad0d78f70171dd"> 78</a></span> <span class="preprocessor">#define TCP_ECE 0x40U</span></div>
<div class="line"><a name="l00079"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#a6f441228e74f83c026c48360667beb48"> 79</a></span> <span class="preprocessor">#define TCP_CWR 0x80U</span></div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment">/* Valid TCP header flags */</span></div>
<div class="line"><a name="l00081"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#a75dbc3ac2d65c23a60dbe2f96a874501"> 81</a></span> <span class="preprocessor">#define TCP_FLAGS 0x3fU</span></div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  </div>
<div class="line"><a name="l00083"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#a5b97d3b7e68c20eb3eab87a61d779223"> 83</a></span> <span class="preprocessor">#define TCPH_HDRLEN(phdr) ((u16_t)(lwip_ntohs((phdr)->_hdrlen_rsvd_flags) >> 12))</span></div>
<div class="line"><a name="l00084"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#ad5de3cf876b2c7f6835f44132fe0e9d5"> 84</a></span> <span class="preprocessor">#define TCPH_FLAGS(phdr) ((u16_t)(lwip_ntohs((phdr)->_hdrlen_rsvd_flags) & TCP_FLAGS))</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  </div>
<div class="line"><a name="l00086"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#a8c29d17957680854699ac2e5dab9aca4"> 86</a></span> <span class="preprocessor">#define TCPH_HDRLEN_SET(phdr, len) (phdr)->_hdrlen_rsvd_flags = lwip_htons(((len) << 12) | TCPH_FLAGS(phdr))</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#afe7c917080459557c65071c4b13c8e12"> 87</a></span> <span class="preprocessor">#define TCPH_FLAGS_SET(phdr, flags) (phdr)->_hdrlen_rsvd_flags = (((phdr)->_hdrlen_rsvd_flags & PP_HTONS(~TCP_FLAGS)) | lwip_htons(flags))</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#a57fb29aed8df21ccff4481612ee40407"> 88</a></span> <span class="preprocessor">#define TCPH_HDRLEN_FLAGS_SET(phdr, len, flags) (phdr)->_hdrlen_rsvd_flags = (u16_t)(lwip_htons((u16_t)((len) << 12) | (flags)))</span></div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  </div>
<div class="line"><a name="l00090"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#a42432f2dde6716ecb0087ccbc47cc75b"> 90</a></span> <span class="preprocessor">#define TCPH_SET_FLAG(phdr, flags ) (phdr)->_hdrlen_rsvd_flags = ((phdr)->_hdrlen_rsvd_flags | lwip_htons(flags))</span></div>
<div class="line"><a name="l00091"></a><span class="lineno"><a class="line" href="prot_2tcp_8h.html#adc07c9186474e45d2fc40e9efc76d2ba"> 91</a></span> <span class="preprocessor">#define TCPH_UNSET_FLAG(phdr, flags) (phdr)->_hdrlen_rsvd_flags = ((phdr)->_hdrlen_rsvd_flags & ~lwip_htons(flags))</span></div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  </div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span> <span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> }</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span> <span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  </div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="preprocessor">#endif </span><span class="comment">/* LWIP_HDR_PROT_TCP_H */</span><span class="preprocessor"></span></div>
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<div class="ttc" id="agroup__compiler__abstraction_html_ga77570ac4fcab86864fa1916e55676da2"><div class="ttname"><a href="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="arch_8h_source.html#l00124">arch.h:124</a></div></div>
<div class="ttc" id="agroup__compiler__abstraction_html_ga4c14294869aceba3ef9d4c0c302d0f33"><div class="ttname"><a href="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="arch_8h_source.html#l00126">arch.h:126</a></div></div>
<div class="ttc" id="aprot_2tcp_8h_html_a29212dd70e32fb34e4db4ea46fe8cfdb"><div class="ttname"><a href="prot_2tcp_8h.html#a29212dd70e32fb34e4db4ea46fe8cfdb">PACK_STRUCT_STRUCT</a></div><div class="ttdeci">PACK_STRUCT_BEGIN struct tcp_hdr PACK_STRUCT_STRUCT</div></div>
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<div class="ttc" id="acc_8h_html_a73199061891adf1b912d20835c7d5e96"><div class="ttname"><a href="cc_8h.html#a73199061891adf1b912d20835c7d5e96">PACK_STRUCT_BEGIN</a></div><div class="ttdeci">#define PACK_STRUCT_BEGIN</div><div class="ttdef"><b>Definition:</b> <a href="cc_8h_source.html#l00008">cc.h:8</a></div></div>
<div class="ttc" id="astructtcp__hdr_html"><div class="ttname"><a href="structtcp__hdr.html">tcp_hdr</a></div><div class="ttdef"><b>Definition:</b> <a href="prot_2tcp_8h_source.html#l00056">tcp.h:56</a></div></div>
<div class="ttc" id="astructtcp__hdr_html_ac2319bd25c4548055230b4a00052d715"><div class="ttname"><a href="structtcp__hdr.html#ac2319bd25c4548055230b4a00052d715">tcp_hdr::PACK_STRUCT_FIELD</a></div><div class="ttdeci">PACK_STRUCT_FIELD(u16_t src)</div></div>
<div class="ttc" id="acc_8h_html_a465fef70f294e21cbf4ea51fc342f20e"><div class="ttname"><a href="cc_8h.html#a465fef70f294e21cbf4ea51fc342f20e">PACK_STRUCT_END</a></div><div class="ttdeci">#define PACK_STRUCT_END</div><div class="ttdef"><b>Definition:</b> <a href="cc_8h_source.html#l00009">cc.h:9</a></div></div>
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