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21*10465441SEvalZero<h1>uip/uip-split.c</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
22*10465441SEvalZero<a name="l00002"></a>00002 <span class="comment"> * Copyright (c) 2004, Swedish Institute of Computer Science.</span>
23*10465441SEvalZero<a name="l00003"></a>00003 <span class="comment"> * All rights reserved.</span>
24*10465441SEvalZero<a name="l00004"></a>00004 <span class="comment"> *</span>
25*10465441SEvalZero<a name="l00005"></a>00005 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
26*10465441SEvalZero<a name="l00006"></a>00006 <span class="comment"> * modification, are permitted provided that the following conditions</span>
27*10465441SEvalZero<a name="l00007"></a>00007 <span class="comment"> * are met:</span>
28*10465441SEvalZero<a name="l00008"></a>00008 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
29*10465441SEvalZero<a name="l00009"></a>00009 <span class="comment"> *    notice, this list of conditions and the following disclaimer.</span>
30*10465441SEvalZero<a name="l00010"></a>00010 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
31*10465441SEvalZero<a name="l00011"></a>00011 <span class="comment"> *    notice, this list of conditions and the following disclaimer in the</span>
32*10465441SEvalZero<a name="l00012"></a>00012 <span class="comment"> *    documentation and/or other materials provided with the distribution.</span>
33*10465441SEvalZero<a name="l00013"></a>00013 <span class="comment"> * 3. Neither the name of the Institute nor the names of its contributors</span>
34*10465441SEvalZero<a name="l00014"></a>00014 <span class="comment"> *    may be used to endorse or promote products derived from this software</span>
35*10465441SEvalZero<a name="l00015"></a>00015 <span class="comment"> *    without specific prior written permission.</span>
36*10465441SEvalZero<a name="l00016"></a>00016 <span class="comment"> *</span>
37*10465441SEvalZero<a name="l00017"></a>00017 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND</span>
38*10465441SEvalZero<a name="l00018"></a>00018 <span class="comment"> * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
39*10465441SEvalZero<a name="l00019"></a>00019 <span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
40*10465441SEvalZero<a name="l00020"></a>00020 <span class="comment"> * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE</span>
41*10465441SEvalZero<a name="l00021"></a>00021 <span class="comment"> * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</span>
42*10465441SEvalZero<a name="l00022"></a>00022 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS</span>
43*10465441SEvalZero<a name="l00023"></a>00023 <span class="comment"> * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)</span>
44*10465441SEvalZero<a name="l00024"></a>00024 <span class="comment"> * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT</span>
45*10465441SEvalZero<a name="l00025"></a>00025 <span class="comment"> * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY</span>
46*10465441SEvalZero<a name="l00026"></a>00026 <span class="comment"> * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF</span>
47*10465441SEvalZero<a name="l00027"></a>00027 <span class="comment"> * SUCH DAMAGE.</span>
48*10465441SEvalZero<a name="l00028"></a>00028 <span class="comment"> *</span>
49*10465441SEvalZero<a name="l00029"></a>00029 <span class="comment"> * This file is part of the uIP TCP/IP stack</span>
50*10465441SEvalZero<a name="l00030"></a>00030 <span class="comment"> *</span>
51*10465441SEvalZero<a name="l00031"></a>00031 <span class="comment"> * Author: Adam Dunkels &lt;[email protected]&gt;</span>
52*10465441SEvalZero<a name="l00032"></a>00032 <span class="comment"> *</span>
53*10465441SEvalZero<a name="l00033"></a>00033 <span class="comment"> * $Id: uip-split.c,v 1.2 2006/06/12 08:00:30 adam Exp $</span>
54*10465441SEvalZero<a name="l00034"></a>00034 <span class="comment"> */</span>
55*10465441SEvalZero<a name="l00035"></a>00035
56*10465441SEvalZero<a name="l00036"></a>00036 <span class="preprocessor">#include &lt;string.h&gt;</span>
57*10465441SEvalZero<a name="l00037"></a>00037
58*10465441SEvalZero<a name="l00038"></a>00038 <span class="preprocessor">#include "<a class="code" href="a00134.html">uip-split.h</a>"</span>
59*10465441SEvalZero<a name="l00039"></a>00039 <span class="preprocessor">#include "<a class="code" href="a00136.html">uip.h</a>"</span>
60*10465441SEvalZero<a name="l00040"></a>00040 <span class="preprocessor">#include "uip-fw.h"</span>
61*10465441SEvalZero<a name="l00041"></a>00041 <span class="preprocessor">#include "<a class="code" href="a00137.html">uip_arch.h</a>"</span>
62*10465441SEvalZero<a name="l00042"></a>00042
63*10465441SEvalZero<a name="l00043"></a>00043
64*10465441SEvalZero<a name="l00044"></a>00044
65*10465441SEvalZero<a name="l00045"></a>00045 <span class="preprocessor">#define BUF ((struct uip_tcpip_hdr *)&amp;uip_buf[UIP_LLH_LEN])</span>
66*10465441SEvalZero<a name="l00046"></a>00046 <span class="preprocessor"></span>
67*10465441SEvalZero<a name="l00047"></a>00047 <span class="comment">/*-----------------------------------------------------------------------------*/</span>
68*10465441SEvalZero<a name="l00048"></a>00048 <span class="keywordtype">void</span>
69*10465441SEvalZero<a name="l00049"></a><a class="code" href="a00154.html#gb4b17aaf20d630f30919b19937b966a3">00049</a> <a class="code" href="a00154.html#gb4b17aaf20d630f30919b19937b966a3">uip_split_output</a>(<span class="keywordtype">void</span>)
70*10465441SEvalZero<a name="l00050"></a>00050 {
71*10465441SEvalZero<a name="l00051"></a>00051   <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u16_t</a> tcplen, len1, len2;
72*10465441SEvalZero<a name="l00052"></a>00052
73*10465441SEvalZero<a name="l00053"></a>00053   <span class="comment">/* We only try to split maximum sized TCP segments. */</span>
74*10465441SEvalZero<a name="l00054"></a>00054   <span class="keywordflow">if</span>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;proto == <a class="code" href="a00150.html#g517c770991459cc62dc009c0d3875c6a">UIP_PROTO_TCP</a> &amp;&amp;
75*10465441SEvalZero<a name="l00055"></a>00055      <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> == <a class="code" href="a00153.html#g3589822ecb9d9c4145209756396b8a6b">UIP_BUFSIZE</a> - <a class="code" href="a00153.html#ge6f4a2453dbd8bc60e6a82774552366a">UIP_LLH_LEN</a>) {
76*10465441SEvalZero<a name="l00056"></a>00056
77*10465441SEvalZero<a name="l00057"></a>00057     tcplen = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - <a class="code" href="a00150.html#gee37386b2ab828787c05227eb109def7">UIP_TCPIP_HLEN</a>;
78*10465441SEvalZero<a name="l00058"></a>00058     <span class="comment">/* Split the segment in two. If the original packet length was</span>
79*10465441SEvalZero<a name="l00059"></a>00059 <span class="comment">       odd, we make the second packet one byte larger. */</span>
80*10465441SEvalZero<a name="l00060"></a>00060     len1 = len2 = tcplen / 2;
81*10465441SEvalZero<a name="l00061"></a>00061     <span class="keywordflow">if</span>(len1 + len2 &lt; tcplen) {
82*10465441SEvalZero<a name="l00062"></a>00062       ++len2;
83*10465441SEvalZero<a name="l00063"></a>00063     }
84*10465441SEvalZero<a name="l00064"></a>00064
85*10465441SEvalZero<a name="l00065"></a>00065     <span class="comment">/* Create the first packet. This is done by altering the length</span>
86*10465441SEvalZero<a name="l00066"></a>00066 <span class="comment">       field of the IP header and updating the checksums. */</span>
87*10465441SEvalZero<a name="l00067"></a>00067     <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = len1 + UIP_TCPIP_HLEN;
88*10465441SEvalZero<a name="l00068"></a>00068 <span class="preprocessor">#if UIP_CONF_IPV6</span>
89*10465441SEvalZero<a name="l00069"></a>00069 <span class="preprocessor"></span>    <span class="comment">/* For IPv6, the IP length field does not include the IPv6 IP header</span>
90*10465441SEvalZero<a name="l00070"></a>00070 <span class="comment">       length. */</span>
91*10465441SEvalZero<a name="l00071"></a>00071     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0] = ((<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>) &gt;&gt; 8);
92*10465441SEvalZero<a name="l00072"></a>00072     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1] = ((<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>) &amp; 0xff);
93*10465441SEvalZero<a name="l00073"></a>00073 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
94*10465441SEvalZero<a name="l00074"></a>00074     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0] = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &gt;&gt; 8;
95*10465441SEvalZero<a name="l00075"></a>00075     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1] = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &amp; 0xff;
96*10465441SEvalZero<a name="l00076"></a>00076 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
97*10465441SEvalZero<a name="l00077"></a>00077
98*10465441SEvalZero<a name="l00078"></a>00078     <span class="comment">/* Recalculate the TCP checksum. */</span>
99*10465441SEvalZero<a name="l00079"></a>00079     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpchksum = 0;
100*10465441SEvalZero<a name="l00080"></a>00080     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpchksum = ~(<a class="code" href="a00150.html#g85b65e38aa74eba18979156f97a94a87">uip_tcpchksum</a>());
101*10465441SEvalZero<a name="l00081"></a>00081
102*10465441SEvalZero<a name="l00082"></a>00082 <span class="preprocessor">#if !UIP_CONF_IPV6</span>
103*10465441SEvalZero<a name="l00083"></a>00083 <span class="preprocessor"></span>    <span class="comment">/* Recalculate the IP checksum. */</span>
104*10465441SEvalZero<a name="l00084"></a>00084     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipchksum = 0;
105*10465441SEvalZero<a name="l00085"></a>00085     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipchksum = ~(<a class="code" href="a00150.html#g2addf34c7d457c1a7899a7e2171ef1e9">uip_ipchksum</a>());
106*10465441SEvalZero<a name="l00086"></a>00086 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
107*10465441SEvalZero<a name="l00087"></a>00087
108*10465441SEvalZero<a name="l00088"></a>00088     <span class="comment">/* Transmit the first packet. */</span>
109*10465441SEvalZero<a name="l00089"></a>00089     <span class="comment">/*    uip_fw_output();*/</span>
110*10465441SEvalZero<a name="l00090"></a>00090     tcpip_output();
111*10465441SEvalZero<a name="l00091"></a>00091
112*10465441SEvalZero<a name="l00092"></a>00092     <span class="comment">/* Now, create the second packet. To do this, it is not enough to</span>
113*10465441SEvalZero<a name="l00093"></a>00093 <span class="comment">       just alter the length field, but we must also update the TCP</span>
114*10465441SEvalZero<a name="l00094"></a>00094 <span class="comment">       sequence number and point the uip_appdata to a new place in</span>
115*10465441SEvalZero<a name="l00095"></a>00095 <span class="comment">       memory. This place is detemined by the length of the first</span>
116*10465441SEvalZero<a name="l00096"></a>00096 <span class="comment">       packet (len1). */</span>
117*10465441SEvalZero<a name="l00097"></a>00097     <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = len2 + UIP_TCPIP_HLEN;
118*10465441SEvalZero<a name="l00098"></a>00098 <span class="preprocessor">#if UIP_CONF_IPV6</span>
119*10465441SEvalZero<a name="l00099"></a>00099 <span class="preprocessor"></span>    <span class="comment">/* For IPv6, the IP length field does not include the IPv6 IP header</span>
120*10465441SEvalZero<a name="l00100"></a>00100 <span class="comment">       length. */</span>
121*10465441SEvalZero<a name="l00101"></a>00101     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0] = ((<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>) &gt;&gt; 8);
122*10465441SEvalZero<a name="l00102"></a>00102     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1] = ((<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>) &amp; 0xff);
123*10465441SEvalZero<a name="l00103"></a>00103 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span>
124*10465441SEvalZero<a name="l00104"></a>00104     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[0] = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &gt;&gt; 8;
125*10465441SEvalZero<a name="l00105"></a>00105     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;len[1] = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> &amp; 0xff;
126*10465441SEvalZero<a name="l00106"></a>00106 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
127*10465441SEvalZero<a name="l00107"></a>00107
128*10465441SEvalZero<a name="l00108"></a>00108     <span class="comment">/*    uip_appdata += len1;*/</span>
129*10465441SEvalZero<a name="l00109"></a>00109     memcpy(<a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a>, (<a class="code" href="a00153.html#g4caecabca98b43919dd11be1c0d4cd8e">u8_t</a> *)<a class="code" href="a00150.html#g561b8eda32e059d4e7397f776268cc63">uip_appdata</a> + len1, len2);
130*10465441SEvalZero<a name="l00110"></a>00110
131*10465441SEvalZero<a name="l00111"></a>00111     <a class="code" href="a00150.html#g6832e4d2d046536b6472f7ac92340f68">uip_add32</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno, len1);
132*10465441SEvalZero<a name="l00112"></a>00112     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[0] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[0];
133*10465441SEvalZero<a name="l00113"></a>00113     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[1] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[1];
134*10465441SEvalZero<a name="l00114"></a>00114     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[2] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[2];
135*10465441SEvalZero<a name="l00115"></a>00115     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;seqno[3] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[3];
136*10465441SEvalZero<a name="l00116"></a>00116
137*10465441SEvalZero<a name="l00117"></a>00117     <span class="comment">/* Recalculate the TCP checksum. */</span>
138*10465441SEvalZero<a name="l00118"></a>00118     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpchksum = 0;
139*10465441SEvalZero<a name="l00119"></a>00119     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;tcpchksum = ~(<a class="code" href="a00150.html#g85b65e38aa74eba18979156f97a94a87">uip_tcpchksum</a>());
140*10465441SEvalZero<a name="l00120"></a>00120
141*10465441SEvalZero<a name="l00121"></a>00121 <span class="preprocessor">#if !UIP_CONF_IPV6</span>
142*10465441SEvalZero<a name="l00122"></a>00122 <span class="preprocessor"></span>    <span class="comment">/* Recalculate the IP checksum. */</span>
143*10465441SEvalZero<a name="l00123"></a>00123     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipchksum = 0;
144*10465441SEvalZero<a name="l00124"></a>00124     <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>-&gt;ipchksum = ~(<a class="code" href="a00150.html#g2addf34c7d457c1a7899a7e2171ef1e9">uip_ipchksum</a>());
145*10465441SEvalZero<a name="l00125"></a>00125 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span>
146*10465441SEvalZero<a name="l00126"></a>00126
147*10465441SEvalZero<a name="l00127"></a>00127     <span class="comment">/* Transmit the second packet. */</span>
148*10465441SEvalZero<a name="l00128"></a>00128     <span class="comment">/*    uip_fw_output();*/</span>
149*10465441SEvalZero<a name="l00129"></a>00129     tcpip_output();
150*10465441SEvalZero<a name="l00130"></a>00130   } <span class="keywordflow">else</span> {
151*10465441SEvalZero<a name="l00131"></a>00131     <span class="comment">/*    uip_fw_output();*/</span>
152*10465441SEvalZero<a name="l00132"></a>00132     tcpip_output();
153*10465441SEvalZero<a name="l00133"></a>00133   }
154*10465441SEvalZero<a name="l00134"></a>00134
155*10465441SEvalZero<a name="l00135"></a>00135 }
156*10465441SEvalZero<a name="l00136"></a>00136 <span class="comment">/*-----------------------------------------------------------------------------*/</span>
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