icmp.h

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/*
 * INET     An implementation of the TCP/IP protocol suite for the LINUX
 *      operating system.  INET is implemented using the  BSD Socket
 *      interface as the means of communication with the user level.
 *
 *      Definitions for the ICMP protocol.
 *
 * Version: @(#)icmp.h  1.0.3   04/28/93
 *
 * Author:  Fred N. van Kempen, <[email protected]>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */
#ifndef _UAPI_LINUX_ICMP_H
#define _UAPI_LINUX_ICMP_H

#include <linux/types.h>

#define ICMP_ECHOREPLY      0   /* Echo Reply           */
#define ICMP_DEST_UNREACH   3   /* Destination Unreachable  */
#define ICMP_SOURCE_QUENCH  4   /* Source Quench        */
#define ICMP_REDIRECT       5   /* Redirect (change route)  */
#define ICMP_ECHO       8   /* Echo Request         */
#define ICMP_TIME_EXCEEDED  11  /* Time Exceeded        */
#define ICMP_PARAMETERPROB  12  /* Parameter Problem        */
#define ICMP_TIMESTAMP      13  /* Timestamp Request        */
#define ICMP_TIMESTAMPREPLY 14  /* Timestamp Reply      */
#define ICMP_INFO_REQUEST   15  /* Information Request      */
#define ICMP_INFO_REPLY     16  /* Information Reply        */
#define ICMP_ADDRESS        17  /* Address Mask Request     */
#define ICMP_ADDRESSREPLY   18  /* Address Mask Reply       */
#define NR_ICMP_TYPES       18


/* Codes for UNREACH. */
#define ICMP_NET_UNREACH    0   /* Network Unreachable      */
#define ICMP_HOST_UNREACH   1   /* Host Unreachable     */
#define ICMP_PROT_UNREACH   2   /* Protocol Unreachable     */
#define ICMP_PORT_UNREACH   3   /* Port Unreachable     */
#define ICMP_FRAG_NEEDED    4   /* Fragmentation Needed/DF set  */
#define ICMP_SR_FAILED      5   /* Source Route failed      */
#define ICMP_NET_UNKNOWN    6
#define ICMP_HOST_UNKNOWN   7
#define ICMP_HOST_ISOLATED  8
#define ICMP_NET_ANO        9
#define ICMP_HOST_ANO       10
#define ICMP_NET_UNR_TOS    11
#define ICMP_HOST_UNR_TOS   12
#define ICMP_PKT_FILTERED   13  /* Packet filtered */
#define ICMP_PREC_VIOLATION 14  /* Precedence violation */
#define ICMP_PREC_CUTOFF    15  /* Precedence cut off */
#define NR_ICMP_UNREACH     15  /* instead of hardcoding immediate value */

/* Codes for REDIRECT. */
#define ICMP_REDIR_NET      0   /* Redirect Net         */
#define ICMP_REDIR_HOST     1   /* Redirect Host        */
#define ICMP_REDIR_NETTOS   2   /* Redirect Net for TOS     */
#define ICMP_REDIR_HOSTTOS  3   /* Redirect Host for TOS    */

/* Codes for TIME_EXCEEDED. */
#define ICMP_EXC_TTL        0   /* TTL count exceeded       */
#define ICMP_EXC_FRAGTIME   1   /* Fragment Reass time exceeded */


struct icmphdr {
  __u8      type;
  __u8      code;
  __sum16   checksum;
  union {
    struct {
        __be16  id;
        __be16  sequence;
    } echo;
    __be32  gateway;
    struct {
        __be16  __unused;
        __be16  mtu;
    } frag;
  } un;
};


/*
 *  constants for (set|get)sockopt
 */

#define ICMP_FILTER         1

struct icmp_filter {
    __u32       data;
};


#endif /* _UAPI_LINUX_ICMP_H */