sys/src/cmd/ip/icmp.h

   1 /* ICMP for IP v4 and v6 */
   2 enum
   3 {
   4         /* Packet Types, icmp v4 (rfc 792) */
   5         EchoReply       = 0,
   6         Unreachable     = 3,
   7         SrcQuench       = 4,
   8         Redirect        = 5,
   9         EchoRequest     = 8,
  10         TimeExceed      = 11,
  11         InParmProblem   = 12,
  12         Timestamp       = 13,
  13         TimestampReply  = 14,
  14         InfoRequest     = 15,
  15         InfoReply       = 16,
  16         AddrMaskRequest = 17,
  17         AddrMaskReply   = 18,
  18         Traceroute      = 30,
  19         IPv6WhereAreYou = 33,
  20         IPv6IAmHere     = 34,
  21
  22         /* packet types, icmp v6 (rfc 2463) */
  23
  24         /* error messages */
  25         UnreachableV6   = 1,
  26         PacketTooBigV6  = 2,
  27         TimeExceedV6    = 3,
  28         ParamProblemV6  = 4,
  29
  30         /* informational messages (rfc 2461 also) */
  31         EchoRequestV6   = 128,
  32         EchoReplyV6     = 129,
  33         RouterSolicit   = 133,
  34         RouterAdvert    = 134,
  35         NbrSolicit      = 135,
  36         NbrAdvert       = 136,
  37         RedirectV6      = 137,
  38
  39         Maxtype6        = 137,
  40
  41         ICMP_HDRSIZE    = 8,
  42 };
  43
  44 typedef struct Ip4hdr Ip4hdr;
  45 struct Ip4hdr
  46 {
  47         uchar   vihl;           /* Version and header length */
  48         uchar   tos;            /* Type of service */
  49         uchar   length[2];      /* packet length */
  50         uchar   id[2];          /* Identification */
  51         uchar   frag[2];        /* Fragment information */
  52         uchar   ttl;            /* Time to live */
  53         uchar   proto;          /* Protocol */
  54         uchar   ipcksum[2];     /* Header checksum */
  55         uchar   src[4];         /* Ipv4 source */
  56         uchar   dst[4];         /* Ipv4 destination */
  57
  58         uchar   data[];
  59 };
  60
  61 // #define IP4HDRSZ offsetof(Ip4hdr, data[0])
  62
  63 /* the icmp payload has the same format in v4 and v6 */
  64 typedef struct Icmphdr Icmphdr;
  65 struct Icmphdr {
  66         uchar   type;
  67         uchar   code;
  68         uchar   cksum[2];
  69         uchar   icmpid[2];
  70         uchar   seq[2];
  71         uchar   data[];
  72 };
  73
  74 // #define ICMPHDRSZ offsetof(Icmphdr, data[0])