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/* 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,
};
typedef struct Ip4hdr Ip4hdr;
struct Ip4hdr
{
uchar vihl; /* Version and header length */
uchar tos; /* Type of service */
uchar length[2]; /* packet length */
uchar id[2]; /* Identification */
uchar frag[2]; /* Fragment information */
uchar ttl; /* Time to live */
uchar proto; /* Protocol */
uchar ipcksum[2]; /* Header checksum */
uchar src[4]; /* Ipv4 source */
uchar dst[4]; /* Ipv4 destination */
uchar data[];
};
// #define IP4HDRSZ offsetof(Ip4hdr, data[0])
/* the icmp payload has the same format in v4 and v6 */
typedef struct Icmphdr Icmphdr;
struct Icmphdr {
uchar type;
uchar code;
uchar cksum[2];
uchar icmpid[2];
uchar seq[2];
uchar data[];
};
// #define ICMPHDRSZ offsetof(Icmphdr, data[0])
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