include/linux/icmp.h

   1 /*
   2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
   3  *              operating system.  INET is implemented using the  BSD Socket
   4  *              interface as the means of communication with the user level.
   5  *
   6  *              Definitions for the ICMP protocol.
   7  *
   8  * Version:     @(#)icmp.h      1.0.3   04/28/93
   9  *
  10  * Author:      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
  11  *
  12  *              This program is free software; you can redistribute it and/or
  13  *              modify it under the terms of the GNU General Public License
  14  *              as published by the Free Software Foundation; either version
  15  *              2 of the License, or (at your option) any later version.
  16  */
  17 #ifndef _LINUX_ICMP_H
  18 #define _LINUX_ICMP_H
  19
  20 #include <linux/types.h>
  21
  22 #define ICMP_ECHOREPLY          0       /* Echo Reply                   */
  23 #define ICMP_DEST_UNREACH       3       /* Destination Unreachable      */
  24 #define ICMP_SOURCE_QUENCH      4       /* Source Quench                */
  25 #define ICMP_REDIRECT           5       /* Redirect (change route)      */
  26 #define ICMP_ECHO               8       /* Echo Request                 */
  27 #define ICMP_TIME_EXCEEDED      11      /* Time Exceeded                */
  28 #define ICMP_PARAMETERPROB      12      /* Parameter Problem            */
  29 #define ICMP_TIMESTAMP          13      /* Timestamp Request            */
  30 #define ICMP_TIMESTAMPREPLY     14      /* Timestamp Reply              */
  31 #define ICMP_INFO_REQUEST       15      /* Information Request          */
  32 #define ICMP_INFO_REPLY         16      /* Information Reply            */
  33 #define ICMP_ADDRESS            17      /* Address Mask Request         */
  34 #define ICMP_ADDRESSREPLY       18      /* Address Mask Reply           */
  35 #define NR_ICMP_TYPES           18
  36
  37
  38 /* Codes for UNREACH. */
  39 #define ICMP_NET_UNREACH        0       /* Network Unreachable          */
  40 #define ICMP_HOST_UNREACH       1       /* Host Unreachable             */
  41 #define ICMP_PROT_UNREACH       2       /* Protocol Unreachable         */
  42 #define ICMP_PORT_UNREACH       3       /* Port Unreachable             */
  43 #define ICMP_FRAG_NEEDED        4       /* Fragmentation Needed/DF set  */
  44 #define ICMP_SR_FAILED          5       /* Source Route failed          */
  45 #define ICMP_NET_UNKNOWN        6
  46 #define ICMP_HOST_UNKNOWN       7
  47 #define ICMP_HOST_ISOLATED      8
  48 #define ICMP_NET_ANO            9
  49 #define ICMP_HOST_ANO           10
  50 #define ICMP_NET_UNR_TOS        11
  51 #define ICMP_HOST_UNR_TOS       12
  52 #define ICMP_PKT_FILTERED       13      /* Packet filtered */
  53 #define ICMP_PREC_VIOLATION     14      /* Precedence violation */
  54 #define ICMP_PREC_CUTOFF        15      /* Precedence cut off */
  55 #define NR_ICMP_UNREACH         15      /* instead of hardcoding immediate value */
  56
  57 /* Codes for REDIRECT. */
  58 #define ICMP_REDIR_NET          0       /* Redirect Net                 */
  59 #define ICMP_REDIR_HOST         1       /* Redirect Host                */
  60 #define ICMP_REDIR_NETTOS       2       /* Redirect Net for TOS         */
  61 #define ICMP_REDIR_HOSTTOS      3       /* Redirect Host for TOS        */
  62
  63 /* Codes for TIME_EXCEEDED. */
  64 #define ICMP_EXC_TTL            0       /* TTL count exceeded           */
  65 #define ICMP_EXC_FRAGTIME       1       /* Fragment Reass time exceeded */
  66
  67
  68 struct icmphdr {
  69   __u8          type;
  70   __u8          code;
  71   __sum16       checksum;
  72   union {
  73         struct {
  74                 __be16  id;
  75                 __be16  sequence;
  76         } echo;
  77         __be32  gateway;
  78         struct {
  79                 __be16  __unused;
  80                 __be16  mtu;
  81         } frag;
  82   } un;
  83 };
  84
  85 #ifdef __KERNEL__
  86 #include <linux/skbuff.h>
  87
  88 static inline struct icmphdr *icmp_hdr(const struct sk_buff *skb)
  89 {
  90         return (struct icmphdr *)skb_transport_header(skb);
  91 }
  92 #endif
  93
  94 /*
  95  *      constants for (set|get)sockopt
  96  */
  97
  98 #define ICMP_FILTER                     1
  99
 100 struct icmp_filter {
 101         __u32           data;
 102 };
 103
 104
 105 #endif  /* _LINUX_ICMP_H */