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21 <h1>uip/uip-split.c</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <spa…
22 <a name="l00002"></a>00002 <span class="comment"> * Copyright (c) 2004, Swedish Institute of Comput…
23 <a name="l00003"></a>00003 <span class="comment"> * All rights reserved.</span>
24 <a name="l00004"></a>00004 <span class="comment"> *</span>
25 <a name="l00005"></a>00005 <span class="comment"> * Redistribution and use in source and binary for…
26 <a name="l00006"></a>00006 <span class="comment"> * modification, are permitted provided that the f…
27 <a name="l00007"></a>00007 <span class="comment"> * are met:</span>
28 <a name="l00008"></a>00008 <span class="comment"> * 1. Redistributions of source code must retain t…
29 <a name="l00009"></a>00009 <span class="comment"> * notice, this list of conditions and the foll…
30 <a name="l00010"></a>00010 <span class="comment"> * 2. Redistributions in binary form must reproduc…
31 <a name="l00011"></a>00011 <span class="comment"> * notice, this list of conditions and the foll…
32 <a name="l00012"></a>00012 <span class="comment"> * documentation and/or other materials provide…
33 <a name="l00013"></a>00013 <span class="comment"> * 3. Neither the name of the Institute nor the na…
34 <a name="l00014"></a>00014 <span class="comment"> * may be used to endorse or promote products d…
35 <a name="l00015"></a>00015 <span class="comment"> * without specific prior written permission.</…
36 <a name="l00016"></a>00016 <span class="comment"> *</span>
37 <a name="l00017"></a>00017 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND …
38 <a name="l00018"></a>00018 <span class="comment"> * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, B…
39 <a name="l00019"></a>00019 <span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNE…
40 <a name="l00020"></a>00020 <span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUT…
41 <a name="l00021"></a>00021 <span class="comment"> * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, …
42 <a name="l00022"></a>00022 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCURE…
43 <a name="l00023"></a>00023 <span class="comment"> * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR …
44 <a name="l00024"></a>00024 <span class="comment"> * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, …
45 <a name="l00025"></a>00025 <span class="comment"> * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH…
46 <a name="l00026"></a>00026 <span class="comment"> * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISE…
47 <a name="l00027"></a>00027 <span class="comment"> * SUCH DAMAGE.</span>
48 <a name="l00028"></a>00028 <span class="comment"> *</span>
49 <a name="l00029"></a>00029 <span class="comment"> * This file is part of the uIP TCP/IP stack</span>
50 <a name="l00030"></a>00030 <span class="comment"> *</span>
51 <a name="l00031"></a>00031 <span class="comment"> * Author: Adam Dunkels <[email protected]></span>
52 <a name="l00032"></a>00032 <span class="comment"> *</span>
53 <a name="l00033"></a>00033 <span class="comment"> * $Id: uip-split.c,v 1.2 2006/06/12 08:00:30 adam…
54 <a name="l00034"></a>00034 <span class="comment"> */</span>
55 <a name="l00035"></a>00035
56 <a name="l00036"></a>00036 <span class="preprocessor">#include <string.h></span>
57 <a name="l00037"></a>00037
58 <a name="l00038"></a>00038 <span class="preprocessor">#include "<a class="code" href="a00134.html">…
59 <a name="l00039"></a>00039 <span class="preprocessor">#include "<a class="code" href="a00136.html">…
60 <a name="l00040"></a>00040 <span class="preprocessor">#include "uip-fw.h"</span>
61 <a name="l00041"></a>00041 <span class="preprocessor">#include "<a class="code" href="a00137.html">…
62 <a name="l00042"></a>00042
63 <a name="l00043"></a>00043
64 <a name="l00044"></a>00044
65 <a name="l00045"></a>00045 <span class="preprocessor">#define BUF ((struct uip_tcpip_hdr *)&uip…
66 <a name="l00046"></a>00046 <span class="preprocessor"></span>
67 <a name="l00047"></a>00047 <span class="comment">/*------------------------------------------------…
68 <a name="l00048"></a>00048 <span class="keywordtype">void</span>
69 …a name="l00049"></a><a class="code" href="a00154.html#gb4b17aaf20d630f30919b19937b966a3">00049</a>…
70 <a name="l00050"></a>00050 {
71 <a name="l00051"></a>00051 <a class="code" href="a00153.html#g77570ac4fcab86864fa1916e55676da2">u…
72 <a name="l00052"></a>00052
73 <a name="l00053"></a>00053 <span class="comment">/* We only try to split maximum sized TCP segmen…
74 …a name="l00054"></a>00054 <span class="keywordflow">if</span>(<a class="code" href="a00150.html#…
75 …a name="l00055"></a>00055 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1…
76 <a name="l00056"></a>00056
77 …a name="l00057"></a>00057 tcplen = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d…
78 <a name="l00058"></a>00058 <span class="comment">/* Split the segment in two. If the original p…
79 <a name="l00059"></a>00059 <span class="comment"> odd, we make the second packet one byte lar…
80 <a name="l00060"></a>00060 len1 = len2 = tcplen / 2;
81 <a name="l00061"></a>00061 <span class="keywordflow">if</span>(len1 + len2 < tcplen) {
82 <a name="l00062"></a>00062 ++len2;
83 <a name="l00063"></a>00063 }
84 <a name="l00064"></a>00064
85 <a name="l00065"></a>00065 <span class="comment">/* Create the first packet. This is done by al…
86 <a name="l00066"></a>00066 <span class="comment"> field of the IP header and updating the che…
87 <a name="l00067"></a>00067 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1"…
88 <a name="l00068"></a>00068 <span class="preprocessor">#if UIP_CONF_IPV6</span>
89 <a name="l00069"></a>00069 <span class="preprocessor"></span> <span class="comment">/* For IPv6,…
90 <a name="l00070"></a>00070 <span class="comment"> length. */</span>
91 …a name="l00071"></a>00071 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
92 …a name="l00072"></a>00072 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
93 <a name="l00073"></a>00073 <span class="preprocessor">#else </span><span class="comment">/* UIP_CON…
94 …a name="l00074"></a>00074 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
95 …a name="l00075"></a>00075 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
96 <a name="l00076"></a>00076 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CO…
97 <a name="l00077"></a>00077
98 <a name="l00078"></a>00078 <span class="comment">/* Recalculate the TCP checksum. */</span>
99 <a name="l00079"></a>00079 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
100 …a name="l00080"></a>00080 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
101 <a name="l00081"></a>00081
102 <a name="l00082"></a>00082 <span class="preprocessor">#if !UIP_CONF_IPV6</span>
103 <a name="l00083"></a>00083 <span class="preprocessor"></span> <span class="comment">/* Recalcula…
104 <a name="l00084"></a>00084 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
105 …a name="l00085"></a>00085 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
106 <a name="l00086"></a>00086 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CO…
107 <a name="l00087"></a>00087
108 <a name="l00088"></a>00088 <span class="comment">/* Transmit the first packet. */</span>
109 <a name="l00089"></a>00089 <span class="comment">/* uip_fw_output();*/</span>
110 <a name="l00090"></a>00090 tcpip_output();
111 <a name="l00091"></a>00091
112 <a name="l00092"></a>00092 <span class="comment">/* Now, create the second packet. To do this, …
113 <a name="l00093"></a>00093 <span class="comment"> just alter the length field, but we must al…
114 <a name="l00094"></a>00094 <span class="comment"> sequence number and point the uip_appdata t…
115 <a name="l00095"></a>00095 <span class="comment"> memory. This place is detemined by the leng…
116 <a name="l00096"></a>00096 <span class="comment"> packet (len1). */</span>
117 <a name="l00097"></a>00097 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1"…
118 <a name="l00098"></a>00098 <span class="preprocessor">#if UIP_CONF_IPV6</span>
119 <a name="l00099"></a>00099 <span class="preprocessor"></span> <span class="comment">/* For IPv6,…
120 <a name="l00100"></a>00100 <span class="comment"> length. */</span>
121 …a name="l00101"></a>00101 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
122 …a name="l00102"></a>00102 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
123 <a name="l00103"></a>00103 <span class="preprocessor">#else </span><span class="comment">/* UIP_CON…
124 …a name="l00104"></a>00104 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
125 …a name="l00105"></a>00105 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
126 <a name="l00106"></a>00106 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CO…
127 <a name="l00107"></a>00107
128 <a name="l00108"></a>00108 <span class="comment">/* uip_appdata += len1;*/</span>
129 …a name="l00109"></a>00109 memcpy(<a class="code" href="a00150.html#g561b8eda32e059d4e7397f7762…
130 <a name="l00110"></a>00110
131 …a name="l00111"></a>00111 <a class="code" href="a00150.html#g6832e4d2d046536b6472f7ac92340f68"…
132 …a name="l00112"></a>00112 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
133 …a name="l00113"></a>00113 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
134 …a name="l00114"></a>00114 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
135 …a name="l00115"></a>00115 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
136 <a name="l00116"></a>00116
137 <a name="l00117"></a>00117 <span class="comment">/* Recalculate the TCP checksum. */</span>
138 <a name="l00118"></a>00118 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
139 …a name="l00119"></a>00119 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
140 <a name="l00120"></a>00120
141 <a name="l00121"></a>00121 <span class="preprocessor">#if !UIP_CONF_IPV6</span>
142 <a name="l00122"></a>00122 <span class="preprocessor"></span> <span class="comment">/* Recalcula…
143 <a name="l00123"></a>00123 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
144 …a name="l00124"></a>00124 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0"…
145 <a name="l00125"></a>00125 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CO…
146 <a name="l00126"></a>00126
147 <a name="l00127"></a>00127 <span class="comment">/* Transmit the second packet. */</span>
148 <a name="l00128"></a>00128 <span class="comment">/* uip_fw_output();*/</span>
149 <a name="l00129"></a>00129 tcpip_output();
150 <a name="l00130"></a>00130 } <span class="keywordflow">else</span> {
151 <a name="l00131"></a>00131 <span class="comment">/* uip_fw_output();*/</span>
152 <a name="l00132"></a>00132 tcpip_output();
153 <a name="l00133"></a>00133 }
154 <a name="l00134"></a>00134
155 <a name="l00135"></a>00135 }
156 <a name="l00136"></a>00136 <span class="comment">/*------------------------------------------------…
158 <a href="http://www.doxygen.org/index.html">
159 <img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address>