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<a name="l00062"></a>00062 ++len2;<a name="l00063"></a>00063 }<a name="l00064"></a>00064 <a name="l00065"></a>00065 <span class="comment">/* Create the first packet. This is done by altering the length</span><a name="l00066"></a>00066 <span class="comment"> field of the IP header and updating the checksums. */</span><a name="l00067"></a>00067 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = len1 + UIP_TCPIP_HLEN;<a name="l00068"></a>00068 <span class="preprocessor">#if UIP_CONF_IPV6</span><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><a name="l00070"></a>00070 <span class="comment"> length. */</span><a name="l00071"></a>00071 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->len[0] = ((<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>) >> 8);<a name="l00072"></a>00072 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->len[1] = ((<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>) & 0xff);<a name="l00073"></a>00073 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span><a name="l00074"></a>00074 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->len[0] = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> >> 8;<a name="l00075"></a>00075 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->len[1] = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> & 0xff;<a name="l00076"></a>00076 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span><a name="l00077"></a>00077 <a name="l00078"></a>00078 <span class="comment">/* Recalculate the TCP checksum. */</span><a name="l00079"></a>00079 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->tcpchksum = 0;<a name="l00080"></a>00080 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->tcpchksum = ~(<a class="code" href="a00150.html#g85b65e38aa74eba18979156f97a94a87">uip_tcpchksum</a>());<a name="l00081"></a>00081 <a name="l00082"></a>00082 <span class="preprocessor">#if !UIP_CONF_IPV6</span><a name="l00083"></a>00083 <span class="preprocessor"></span> <span class="comment">/* Recalculate the IP checksum. */</span><a name="l00084"></a>00084 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->ipchksum = 0;<a name="l00085"></a>00085 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->ipchksum = ~(<a class="code" href="a00150.html#g2addf34c7d457c1a7899a7e2171ef1e9">uip_ipchksum</a>());<a name="l00086"></a>00086 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span><a name="l00087"></a>00087 <a name="l00088"></a>00088 <span class="comment">/* Transmit the first packet. */</span><a name="l00089"></a>00089 <span class="comment">/* uip_fw_output();*/</span><a name="l00090"></a>00090 tcpip_output();<a name="l00091"></a>00091 <a name="l00092"></a>00092 <span class="comment">/* Now, create the second packet. To do this, it is not enough to</span><a name="l00093"></a>00093 <span class="comment"> just alter the length field, but we must also update the TCP</span><a name="l00094"></a>00094 <span class="comment"> sequence number and point the uip_appdata to a new place in</span><a name="l00095"></a>00095 <span class="comment"> memory. This place is detemined by the length of the first</span><a name="l00096"></a>00096 <span class="comment"> packet (len1). */</span><a name="l00097"></a>00097 <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> = len2 + UIP_TCPIP_HLEN;<a name="l00098"></a>00098 <span class="preprocessor">#if UIP_CONF_IPV6</span><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><a name="l00100"></a>00100 <span class="comment"> length. */</span><a name="l00101"></a>00101 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->len[0] = ((<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>) >> 8);<a name="l00102"></a>00102 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->len[1] = ((<a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> - <a class="code" href="a00150.html#g6bc12c6c7b56f73ce5d57abfdcdc6eb5">UIP_IPH_LEN</a>) & 0xff);<a name="l00103"></a>00103 <span class="preprocessor">#else </span><span class="comment">/* UIP_CONF_IPV6 */</span><a name="l00104"></a>00104 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->len[0] = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> >> 8;<a name="l00105"></a>00105 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->len[1] = <a class="code" href="a00149.html#g12a33f0c09711167bdf3dd7d7cf8c5a1">uip_len</a> & 0xff;<a name="l00106"></a>00106 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span><a name="l00107"></a>00107 <a name="l00108"></a>00108 <span class="comment">/* uip_appdata += len1;*/</span><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);<a name="l00110"></a>00110 <a name="l00111"></a>00111 <a class="code" href="a00150.html#g6832e4d2d046536b6472f7ac92340f68">uip_add32</a>(<a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->seqno, len1);<a name="l00112"></a>00112 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->seqno[0] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[0];<a name="l00113"></a>00113 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->seqno[1] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[1];<a name="l00114"></a>00114 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->seqno[2] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[2];<a name="l00115"></a>00115 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->seqno[3] = <a class="code" href="a00151.html#g2a0cf5d86c58fab216414ce59bf1fea1">uip_acc32</a>[3];<a name="l00116"></a>00116 <a name="l00117"></a>00117 <span class="comment">/* Recalculate the TCP checksum. */</span><a name="l00118"></a>00118 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->tcpchksum = 0;<a name="l00119"></a>00119 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->tcpchksum = ~(<a class="code" href="a00150.html#g85b65e38aa74eba18979156f97a94a87">uip_tcpchksum</a>());<a name="l00120"></a>00120 <a name="l00121"></a>00121 <span class="preprocessor">#if !UIP_CONF_IPV6</span><a name="l00122"></a>00122 <span class="preprocessor"></span> <span class="comment">/* Recalculate the IP checksum. */</span><a name="l00123"></a>00123 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->ipchksum = 0;<a name="l00124"></a>00124 <a class="code" href="a00150.html#g24f52ac52d6e714cb04a5aa01be3bdd0">BUF</a>->ipchksum = ~(<a class="code" href="a00150.html#g2addf34c7d457c1a7899a7e2171ef1e9">uip_ipchksum</a>());<a name="l00125"></a>00125 <span class="preprocessor">#endif </span><span class="comment">/* UIP_CONF_IPV6 */</span><a name="l00126"></a>00126 <a name="l00127"></a>00127 <span class="comment">/* Transmit the second packet. */</span><a name="l00128"></a>00128 <span class="comment">/* uip_fw_output();*/</span><a name="l00129"></a>00129 tcpip_output();<a name="l00130"></a>00130 } <span class="keywordflow">else</span> {<a name="l00131"></a>00131 <span class="comment">/* uip_fw_output();*/</span><a name="l00132"></a>00132 tcpip_output();<a name="l00133"></a>00133 }<a name="l00134"></a>00134 <a name="l00135"></a>00135 }<a name="l00136"></a>00136 <span class="comment">/*-----------------------------------------------------------------------------*/</span></pre></div><hr size="1"><address style="align: right;"><small>Generated on Mon Jun 12 10:23:01 2006 for uIP 1.0 by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.6 </small></address></body></html>⌨️ 快捷键说明
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