root/include/linux/icmp.h

INCLUDED FROM

DEFINITIONS

1. icmp_hdr

/*
 * 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, <waltje@uWalt.NL.Mugnet.ORG>
 *
 *              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 _LINUX_ICMP_H
#define _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;
};

#ifdef __KERNEL__
#include <linux/skbuff.h>

static inline struct icmphdr *icmp_hdr(const struct sk_buff *skb)
{
        return (struct icmphdr *)skb_transport_header(skb);
}
#endif

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

#define ICMP_FILTER                     1

struct icmp_filter {
        __u32           data;
};


#endif  /* _LINUX_ICMP_H */