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<p>
<dl compact><dt><b>Author: </b></dt><dd>
 <ul>
<li> Jari Lahti </ul>
</dl><dl compact><dt><b>Date: </b></dt><dd>
11.06.2002 </dl><dl compact><dt><b>Parameters: </b></dt><dd>
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<tr><td valign=top><em>frame</em>&nbsp;</td><td>
pointer to IP frame to be checked </td></tr>
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</dl><dl compact><dt><b>Returns: </b></dt><dd>
 <ul>
<li> 0 - checksum corrupted <li> 1 - checksum OK</ul>
</dl>Checksum of an IP packet is calculated and compared with the received checksum. Error is signaled if there is discrepancy between them. 
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Definition at line <a class="el" href="ip_8c-source.html#l00474">474</a> of file <a class="el" href="ip_8c-source.html">ip.c</a>.
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References <a class="el" href="ip_8h-source.html#l00122">ip_frame::checksum</a>, <a class="el" href="ip_8h-source.html#l00124">ip_frame::dip</a>, <a class="el" href="ip_8h-source.html#l00119">ip_frame::frags</a>, <a class="el" href="ip_8h-source.html#l00118">ip_frame::id</a>, <a class="el" href="ip_8c-source.html#l00539">ip_checksum()</a>, <a class="el" href="ip_8h-source.html#l00125">ip_frame::opt</a>, <a class="el" href="ip_8h-source.html#l00121">ip_frame::protocol</a>, <a class="el" href="ip_8h-source.html#l00123">ip_frame::sip</a>, <a class="el" href="ip_8h-source.html#l00117">ip_frame::tlen</a>, <a class="el" href="ip_8h-source.html#l00116">ip_frame::tos</a>, <a class="el" href="ip_8h-source.html#l00120">ip_frame::ttl</a>, and <a class="el" href="ip_8h-source.html#l00115">ip_frame::vihl</a>.
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Referenced by <a class="el" href="ip_8c-source.html#l00115">process_ip_in()</a>.    </td>
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<a name="a7" doxytag="ip.c::ip_checksum"></a><p>
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          <td class="md" nowrap valign="top"> UINT16 ip_checksum </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">UINT16&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>cs</em>, </td>
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          <td class="md" nowrap>UINT8&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>dat</em>, </td>
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          <td class="md" nowrap>UINT8&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>count</em></td>
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          <td class="md">)&nbsp;</td>
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<dl compact><dt><b>Author: </b></dt><dd>
 <ul>
<li> Jari Lahti </ul>
</dl><dl compact><dt><b>Date: </b></dt><dd>
24.02.2002 </dl><dl compact><dt><b>Parameters: </b></dt><dd>
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<tr><td valign=top><em>cs</em>&nbsp;</td><td>
last checksum value </td></tr>
<tr><td valign=top><em>dat</em>&nbsp;</td><td>
byte to be added to checksum </td></tr>
<tr><td valign=top><em>count</em>&nbsp;</td><td>
byte indicating whether dat is MSB or LSB byte </td></tr>
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</dl><dl compact><dt><b>Returns: </b></dt><dd>
new checksum value</dl>Based on count value, dat byte is added to checksum either as a MSB or a LSB byte and the new checksum value is then returned. 
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Definition at line <a class="el" href="ip_8c-source.html#l00539">539</a> of file <a class="el" href="ip_8c-source.html">ip.c</a>.
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Referenced by <a class="el" href="ip_8c-source.html#l00474">ip_check_cs()</a>, <a class="el" href="ip_8c-source.html#l00582">ip_checksum_buf()</a>, <a class="el" href="ip_8c-source.html#l00417">ip_construct_cs()</a>, <a class="el" href="icmp_8c-source.html#l00097">process_icmp_in()</a>, <a class="el" href="tcp_8c-source.html#l02119">process_tcp_out()</a>, <a class="el" href="udp_8c-source.html#l00550">process_udp_in()</a>, <a class="el" href="tcp_8c-source.html#l02567">tcp_check_cs()</a>, and <a class="el" href="udp_8c-source.html#l00395">udp_send()</a>.    </td>
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<a name="a8" doxytag="ip.c::ip_checksum_buf"></a><p>
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          <td class="md" nowrap valign="top"> UINT32 ip_checksum_buf </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">UINT16&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>cs</em>, </td>
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          <td class="md" nowrap>UINT8 *&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>buf</em>, </td>
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          <td class="md" nowrap>UINT16&nbsp;</td>
          <td class="mdname" nowrap>&nbsp; <em>len</em></td>
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          <td class="md">)&nbsp;</td>
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<p>
<dl compact><dt><b>Author: </b></dt><dd>
 <ul>
<li> Jari Lahti </ul>
</dl><dl compact><dt><b>Date: </b></dt><dd>
03.08.2003 </dl><dl compact><dt><b>Parameters: </b></dt><dd>
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<tr><td valign=top><em>cs</em>&nbsp;</td><td>
last checksum value </td></tr>
<tr><td valign=top><em>buf</em>&nbsp;</td><td>
buffer who's checksum we're calculating </td></tr>
<tr><td valign=top><em>len</em>&nbsp;</td><td>
length of data in buffer </td></tr>
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</dl><dl compact><dt><b>Returns: </b></dt><dd>
new checksum value</dl>Calculates checksum of the data in buffer and returns new checksum value. 
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Definition at line <a class="el" href="ip_8c-source.html#l00582">582</a> of file <a class="el" href="ip_8c-source.html">ip.c</a>.
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References <a class="el" href="ip_8c-source.html#l00539">ip_checksum()</a>.
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Referenced by <a class="el" href="icmp_8c-source.html#l00097">process_icmp_in()</a>, <a class="el" href="tcp_8c-source.html#l02119">process_tcp_out()</a>, <a class="el" href="tcp_8c-source.html#l02567">tcp_check_cs()</a>, and <a class="el" href="udp_8c-source.html#l00395">udp_send()</a>.    </td>
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<hr><h2>Variable Documentation</h2>
<a name="a0" doxytag="ip.c::received_ip_packet"></a><p>
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          <td class="md" nowrap valign="top"> struct <a class="el" href="structip__frame.html">ip_frame</a> received_ip_packet
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Various fields from the IP packet are stored in this structure. These values are later used from other upper layer protocols (ICMP, UDP, TCP and possibly others) to extract needed information about the received packet. See <a class="el" href="structip__frame.html">ip_frame</a> definition for struct information. 
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Definition at line <a class="el" href="ip_8c-source.html#l00085">85</a> of file <a class="el" href="ip_8c-source.html">ip.c</a>.    </td>
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<a name="a1" doxytag="ip.c::send_ip_packet"></a><p>
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          <td class="md" nowrap valign="top"> struct <a class="el" href="structip__frame.html">ip_frame</a> send_ip_packet
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Various fields from the IP packet are stored in this structure. These values are filled based on the information supplied by the upper  layer protocols (ICMP, UDP, TCP and possibly others) and used to form a correct IP packet (correct filed values, checksum,..). See <a class="el" href="structip__frame.html">ip_frame</a> definition for struct information. 
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Definition at line <a class="el" href="ip_8c-source.html#l00095">95</a> of file <a class="el" href="ip_8c-source.html">ip.c</a>.    </td>
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<a name="a2" doxytag="ip.c::ip_id"></a><p>
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          <td class="md" nowrap valign="top"> UINT16 ip_id
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ID field in the next IP packet that will be sent 
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Definition at line <a class="el" href="ip_8c-source.html#l00097">97</a> of file <a class="el" href="ip_8c-source.html">ip.c</a>.
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Referenced by <a class="el" href="ip_8c-source.html#l00300">process_ip_out()</a>.    </td>
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