linux/include/linux/icmp.h
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   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
  68struct 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
  88static 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
 100struct icmp_filter {
 101        __u32           data;
 102};
 103
 104
 105#endif  /* _LINUX_ICMP_H */
 106
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