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< pre style = "font-family:monospace;font-size:12pt" >
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< 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 >
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< 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: " Echo or Echo Reply Message" . 0 is the only code explicitly defined for Echo.< / span > < span class = cF0 >
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< a name = "l4" > < / a >
< a name = "l5" > < / a > < / span > < span class = cF1 > class< / span > < span class = cF0 > CICMPHeader
< a name = "l6" > < / a > {
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< 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;
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< a name = "l10" > < / a >
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< 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;
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< 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,
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< 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)
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< a name = "l22" > < / a > {
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< 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;
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< a name = "l26" > < / a >
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< a name = "l27" > < / a > de_index = IPV4PacketAllocate(& 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 < < / 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 > " ICMP SEND REPLY: Failed to allocate IPV4 packet." < / 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 >
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< a name = "l37" > < / a >
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< a name = "l38" > < / a > header = icmp_frame;
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< a name = "l39" > < / a >
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< a name = "l40" > < / a > header-> type = ICMP_TYPE_ECHO_REPLY;
< a name = "l41" > < / a > header-> 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-> 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-> identifier = identifier;
< a name = "l44" > < / a > header-> 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 >
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< a name = "l46" > < / a >
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< 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);
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< a name = "l48" > < / a >
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< a name = "l49" > < / a > IPV4PacketFinish(de_index);
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< 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 > {
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< a name = "l54" > < / a > CICMPHeader *header;
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< a name = "l55" > < / a >
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< a name = "l56" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (packet-> length < < / 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 > " ICMP HANDLER: Caught wrong IPV4 length." < / 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 >
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< a name = "l61" > < / a >
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< a name = "l62" > < / a > header = packet-> data;
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< a name = "l63" > < / a >
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< a name = "l64" > < / a > < / span > < span class = cF1 > if< / span > < span class = cF0 > (header-> type == ICMP_TYPE_ECHO_REQUEST & & header-> code == ICMP_CODE_ECHO)
< a name = "l65" > < / a > < / span > < span class = cF7 > {< / span > < span class = cF0 >
< a name = "l66" > < / a > ARPCachePut(packet-> source_ip_address, packet-> ethernet_frame-> source_address);
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< a name = "l67" > < / a >
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< a name = "l68" > < / a > ICMPReplySend(packet-> source_ip_address,
< a name = "l69" > < / a > header-> identifier,
< a name = "l70" > < / a > header-> sequence_number,
< a name = "l71" > < / a > header-> checksum,
< a name = "l72" > < / a > packet-> 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-> 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 > " ICMP HANDLER: Unhandled ICMP packet. type, code: 0x%X, 0x%X" < / span > < span class = cF0 > , header-> type, header-> code);
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< a name = "l77" > < / a >
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< a name = "l78" > < / a > NetLog(< / span > < span class = cF6 > " ICMP HANDLER: Exiting." < / span > < span class = cF0 > );
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< a name = "l79" > < / a >
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< a name = "l80" > < / a > < / span > < span class = cF1 > return< / span > < span class = cF0 > < / span > < span class = cFE > 0< / span > < span class = cF0 > ;
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< a name = "l81" > < / a > }< / span > < / pre > < / body >
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