| /* ICMP for IP v4 and v6 */ |
| enum |
| { |
| /* Packet Types, icmp v4 (rfc 792) */ |
| EchoReply = 0, |
| Unreachable = 3, |
| SrcQuench = 4, |
| Redirect = 5, |
| EchoRequest = 8, |
| TimeExceed = 11, |
| InParmProblem = 12, |
| Timestamp = 13, |
| TimestampReply = 14, |
| InfoRequest = 15, |
| InfoReply = 16, |
| AddrMaskRequest = 17, |
| AddrMaskReply = 18, |
| Traceroute = 30, |
| IPv6WhereAreYou = 33, |
| IPv6IAmHere = 34, |
| |
| /* packet types, icmp v6 (rfc 2463) */ |
| |
| /* error messages */ |
| UnreachableV6 = 1, |
| PacketTooBigV6 = 2, |
| TimeExceedV6 = 3, |
| ParamProblemV6 = 4, |
| |
| /* informational messages (rfc 2461 also) */ |
| EchoRequestV6 = 128, |
| EchoReplyV6 = 129, |
| RouterSolicit = 133, |
| RouterAdvert = 134, |
| NbrSolicit = 135, |
| NbrAdvert = 136, |
| RedirectV6 = 137, |
| |
| Maxtype6 = 137, |
| |
| ICMP_HDRSIZE = 8, |
| }; |
| |
| struct ip4hdr |
| { |
| uint8_t vihl; /* Version and header length */ |
| uint8_t tos; /* Type of service */ |
| uint8_t length[2]; /* packet length */ |
| uint8_t id[2]; /* Identification */ |
| uint8_t frag[2]; /* Fragment information */ |
| uint8_t ttl; /* Time to live */ |
| uint8_t proto; /* Protocol */ |
| uint8_t ipcksum[2]; /* Header checksum */ |
| uint8_t src[4]; /* Ipv4 source */ |
| uint8_t dst[4]; /* Ipv4 destination */ |
| |
| uint8_t data[]; |
| }; |
| |
| // #define IP4HDRSZ offsetof(Ip4hdr, data[0]) |
| |
| /* the icmp payload has the same format in v4 and v6 */ |
| |
| struct icmphdr { |
| uint8_t type; |
| uint8_t code; |
| uint8_t cksum[2]; |
| uint8_t icmpid[2]; |
| uint8_t seq[2]; |
| uint8_t data[]; |
| }; |
| |
| // #define ICMPHDRSZ offsetof(Icmphdr, data[0]) |
