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ZealOS/docs/Home/Net/Protocols/ICMP.CC.html
TomAwezome 1b75d91002 Fix Mount AHCI Port selection. 
Add arg to SATARep to specify drive types to show.
Add checks in AHCIPortInit to verify port signatures, add helper method to get signatures from port.
2021-08-02 16:40:05 -04:00

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<pre style="font-family:monospace;font-size:12pt">
<a name="l1"></a><span class=cF0>#</span><span class=cF1>define</span><span class=cF0> ICMP_TYPE_ECHO_REPLY </span><span class=cFE>0</span><span class=cF0>
<a name="l2"></a>#</span><span class=cF1>define</span><span class=cF0> ICMP_TYPE_ECHO_REQUEST </span><span class=cFE>8</span><span class=cF0>
<a name="l3"></a>#</span><span class=cF1>define</span><span class=cF0> ICMP_CODE_ECHO </span><span class=cFE>0</span><span class=cF0> </span><span class=cF2>// RFC 792: &quot;Echo or Echo Reply Message&quot;. 0 is the only code explicitly defined for Echo.</span><span class=cF0>
<a name="l4"></a>
<a name="l5"></a></span><span class=cF1>class</span><span class=cF0> CICMPHeader
<a name="l6"></a>{
<a name="l7"></a> </span><span class=cF1>U8</span><span class=cF0> type;
<a name="l8"></a> </span><span class=cF1>U8</span><span class=cF0> code;
<a name="l9"></a> </span><span class=cF9>U16</span><span class=cF0> checksum;
<a name="l10"></a>
<a name="l11"></a> </span><span class=cF9>U16</span><span class=cF0> identifier;
<a name="l12"></a> </span><span class=cF9>U16</span><span class=cF0> sequence_number;
<a name="l13"></a>};
<a name="l14"></a>
<a name="l15"></a>
<a name="l16"></a></span><span class=cF1>U0</span><span class=cF0> ICMPReplySend(</span><span class=cF9>U32</span><span class=cF0> destination_ip_address,
<a name="l17"></a> </span><span class=cF9>U16</span><span class=cF0> identifier,
<a name="l18"></a> </span><span class=cF9>U16</span><span class=cF0> sequence_number,
<a name="l19"></a> </span><span class=cF9>U16</span><span class=cF0> request_checksum,
<a name="l20"></a> </span><span class=cF1>U8</span><span class=cF0> *payload,
<a name="l21"></a> </span><span class=cF9>I64</span><span class=cF0> length)
<a name="l22"></a>{
<a name="l23"></a> </span><span class=cF1>U8</span><span class=cF0> *icmp_frame;
<a name="l24"></a> </span><span class=cF9>I64</span><span class=cF0> de_index;
<a name="l25"></a> CICMPHeader *header;
<a name="l26"></a>
<a name="l27"></a> de_index = IPV4PacketAllocate(&amp;icmp_frame,
<a name="l28"></a> IP_PROTOCOL_ICMP,
<a name="l29"></a> IPV4AddressGet,
<a name="l30"></a> destination_ip_address,
<a name="l31"></a> </span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CICMPHeader</span><span class=cF7>)</span><span class=cF0> + length);
<a name="l32"></a> </span><span class=cF1>if</span><span class=cF0> (de_index &lt; </span><span class=cFE>0</span><span class=cF0>)
<a name="l33"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l34"></a> NetErr(</span><span class=cF6>&quot;ICMP SEND REPLY: Failed to allocate IPV4 packet.&quot;</span><span class=cF0>);
<a name="l35"></a> </span><span class=cF1>return</span><span class=cF0>;
<a name="l36"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l37"></a>
<a name="l38"></a> header = icmp_frame;
<a name="l39"></a>
<a name="l40"></a> header-&gt;type = ICMP_TYPE_ECHO_REPLY;
<a name="l41"></a> header-&gt;code = </span><span class=cFE>0</span><span class=cF0>; </span><span class=cF2>// why is 0 okay?</span><span class=cF0>
<a name="l42"></a> header-&gt;checksum = </span><span class=cF5>EndianU16</span><span class=cF0>(</span><span class=cF5>EndianU16</span><span class=cF7>(</span><span class=cF0>request_checksum</span><span class=cF7>)</span><span class=cF0> + </span><span class=cFE>0x0800</span><span class=cF0>);
<a name="l43"></a> header-&gt;identifier = identifier;
<a name="l44"></a> header-&gt;sequence_number = sequence_number;
<a name="l45"></a> </span><span class=cF2>// TODO: header checksum is awful. Shrine says hack alert.</span><span class=cF0>
<a name="l46"></a>
<a name="l47"></a> </span><span class=cF5>MemCopy</span><span class=cF0>(icmp_frame + </span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CICMPHeader</span><span class=cF7>)</span><span class=cF0>, payload, length);
<a name="l48"></a>
<a name="l49"></a> IPV4PacketFinish(de_index);
<a name="l50"></a>}
<a name="l51"></a>
<a name="l52"></a></span><span class=cF9>I64</span><span class=cF0> ICMPHandler(CIPV4Packet *packet)
<a name="l53"></a>{
<a name="l54"></a> CICMPHeader *header;
<a name="l55"></a>
<a name="l56"></a> </span><span class=cF1>if</span><span class=cF0> (packet-&gt;length &lt; </span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CICMPHeader</span><span class=cF7>)</span><span class=cF0>)
<a name="l57"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l58"></a> NetErr(</span><span class=cF6>&quot;ICMP HANDLER: Caught wrong IPV4 length.&quot;</span><span class=cF0>);
<a name="l59"></a> </span><span class=cF1>return</span><span class=cF0> -</span><span class=cFE>1</span><span class=cF0>;
<a name="l60"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l61"></a>
<a name="l62"></a> header = packet-&gt;data;
<a name="l63"></a>
<a name="l64"></a> </span><span class=cF1>if</span><span class=cF0> (header-&gt;type == ICMP_TYPE_ECHO_REQUEST &amp;&amp; header-&gt;code == ICMP_CODE_ECHO)
<a name="l65"></a> </span><span class=cF7>{</span><span class=cF0>
<a name="l66"></a> ARPCachePut(packet-&gt;source_ip_address, packet-&gt;ethernet_frame-&gt;source_address);
<a name="l67"></a>
<a name="l68"></a> ICMPReplySend(packet-&gt;source_ip_address,
<a name="l69"></a> header-&gt;identifier,
<a name="l70"></a> header-&gt;sequence_number,
<a name="l71"></a> header-&gt;checksum,
<a name="l72"></a> packet-&gt;data + </span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CICMPHeader</span><span class=cF7>)</span><span class=cF0>, </span><span class=cF2>// Data payload at IPV4Packet data location after the ICMP header</span><span class=cF0>
<a name="l73"></a> packet-&gt;length - </span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>CICMPHeader</span><span class=cF7>)</span><span class=cF0>);</span><span class=cF2>// Payload length is size of packet after dropping header.</span><span class=cF0>
<a name="l74"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l75"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l76"></a> NetWarn(</span><span class=cF6>&quot;ICMP HANDLER: Unhandled ICMP packet. type, code: 0x%X, 0x%X&quot;</span><span class=cF0>, header-&gt;type, header-&gt;code);
<a name="l77"></a>
<a name="l78"></a> NetLog(</span><span class=cF6>&quot;ICMP HANDLER: Exiting.&quot;</span><span class=cF0>);
<a name="l79"></a>
<a name="l80"></a> </span><span class=cF1>return</span><span class=cF0> </span><span class=cFE>0</span><span class=cF0>;
<a name="l81"></a>}</span></pre></body>
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