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 #define ICMP_ECHOREPLY          0       /* Echo Reply                   */
  21 #define ICMP_DEST_UNREACH       3       /* Destination Unreachable      */
  22 #define ICMP_SOURCE_QUENCH      4       /* Source Quench                */
  23 #define ICMP_REDIRECT           5       /* Redirect (change route)      */
  24 #define ICMP_ECHO               8       /* Echo Request                 */
  25 #define ICMP_TIME_EXCEEDED      11      /* Time Exceeded                */
  26 #define ICMP_PARAMETERPROB      12      /* Parameter Problem            */
  27 #define ICMP_TIMESTAMP          13      /* Timestamp Request            */
  28 #define ICMP_TIMESTAMPREPLY     14      /* Timestamp Reply              */
  29 #define ICMP_INFO_REQUEST       15      /* Information Request          */
  30 #define ICMP_INFO_REPLY         16      /* Information Reply            */
  31 #define ICMP_ADDRESS            17      /* Address Mask Request         */
  32 #define ICMP_ADDRESSREPLY       18      /* Address Mask Reply           */
  33 #define NR_ICMP_TYPES           18
  34
  35
  36 /* Codes for UNREACH. */
  37 #define ICMP_NET_UNREACH        0       /* Network Unreachable          */
  38 #define ICMP_HOST_UNREACH       1       /* Host Unreachable             */
  39 #define ICMP_PROT_UNREACH       2       /* Protocol Unreachable         */
  40 #define ICMP_PORT_UNREACH       3       /* Port Unreachable             */
  41 #define ICMP_FRAG_NEEDED        4       /* Fragmentation Needed/DF set  */
  42 #define ICMP_SR_FAILED          5       /* Source Route failed          */
  43 #define ICMP_NET_UNKNOWN        6
  44 #define ICMP_HOST_UNKNOWN       7
  45 #define ICMP_HOST_ISOLATED      8
  46 #define ICMP_NET_ANO            9
  47 #define ICMP_HOST_ANO           10
  48 #define ICMP_NET_UNR_TOS        11
  49 #define ICMP_HOST_UNR_TOS       12
  50 #define ICMP_PKT_FILTERED       13      /* Packet filtered */
  51 #define ICMP_PREC_VIOLATION     14      /* Precedence violation */
  52 #define ICMP_PREC_CUTOFF        15      /* Precedence cut off */
  53 #define NR_ICMP_UNREACH         15      /* instead of hardcoding immediate value */
  54
  55 /* Codes for REDIRECT. */
  56 #define ICMP_REDIR_NET          0       /* Redirect Net                 */
  57 #define ICMP_REDIR_HOST         1       /* Redirect Host                */
  58 #define ICMP_REDIR_NETTOS       2       /* Redirect Net for TOS         */
  59 #define ICMP_REDIR_HOSTTOS      3       /* Redirect Host for TOS        */
  60
  61 /* Codes for TIME_EXCEEDED. */
  62 #define ICMP_EXC_TTL            0       /* TTL count exceeded           */
  63 #define ICMP_EXC_FRAGTIME       1       /* Fragment Reass time exceeded */
  64
  65
  66 struct icmphdr {
  67   __u8          type;
  68   __u8          code;
  69   __u16         checksum;
  70   union {
  71         struct {
  72                 __u16   id;
  73                 __u16   sequence;
  74         } echo;
  75         __u32   gateway;
  76         struct {
  77                 __u16   __unused;
  78                 __u16   mtu;
  79         } frag;
  80   } un;
  81 };
  82
  83 #ifdef __KERNEL__
  84
  85 #include <linux/ip.h>
  86
  87 /*
  88  *      Build xmit assembly blocks
  89  */
  90
  91 struct icmp_bxm
  92 {
  93         void *data_ptr;
  94         int data_len;
  95         struct icmphdr icmph;
  96         unsigned long csum;
  97         struct ip_options replyopts;
  98         unsigned char  optbuf[40];
  99 };
 100
 101 struct sk_buff;
 102
 103 extern void icmp_reply(struct icmp_bxm *, struct sk_buff *);
 104
 105 #endif
 106
 107 /*
 108  *      constants for (set|get)sockopt
 109  */
 110
 111 #define ICMP_FILTER                     1
 112
 113 struct icmp_filter {
 114         __u32           data;
 115 };
 116
 117
 118 #endif  /* _LINUX_ICMP_H */