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- /*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that this notice is preserved and that due credit is given
- * to the University of California at Berkeley. The name of the University
- * may not be used to endorse or promote products derived from this
- * software without specific prior written permission. This software
- * is provided ``as is'' without express or implied warranty.
- *
- * @(#)ip_icmp.h 7.3 (Berkeley) 12/7/87
- */
-
- /*
- * Interface Control Message Protocol Definitions.
- * Per RFC 792, September 1981.
- */
-
- /*
- * Structure of an icmp header.
- */
- struct icmp {
- u_char icmp_type; /* type of message, see below */
- u_char icmp_code; /* type sub code */
- u_short icmp_cksum; /* ones complement cksum of struct */
- union {
- u_char ih_pptr; /* ICMP_PARAMPROB */
- struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
- struct ih_idseq {
- n_short icd_id;
- n_short icd_seq;
- } ih_idseq;
- int ih_void;
- } icmp_hun;
- #define icmp_pptr icmp_hun.ih_pptr
- #define icmp_gwaddr icmp_hun.ih_gwaddr
- #define icmp_id icmp_hun.ih_idseq.icd_id
- #define icmp_seq icmp_hun.ih_idseq.icd_seq
- #define icmp_void icmp_hun.ih_void
- union {
- struct id_ts {
- n_time its_otime;
- n_time its_rtime;
- n_time its_ttime;
- } id_ts;
- struct id_ip {
- struct ip idi_ip;
- /* options and then 64 bits of data */
- } id_ip;
- u_long id_mask;
- char id_data[1];
- } icmp_dun;
- #define icmp_otime icmp_dun.id_ts.its_otime
- #define icmp_rtime icmp_dun.id_ts.its_rtime
- #define icmp_ttime icmp_dun.id_ts.its_ttime
- #define icmp_ip icmp_dun.id_ip.idi_ip
- #define icmp_mask icmp_dun.id_mask
- #define icmp_data icmp_dun.id_data
- };
-
- /*
- * Lower bounds on packet lengths for various types.
- * For the error advice packets must first insure that the
- * packet is large enought to contain the returned ip header.
- * Only then can we do the check to see if 64 bits of packet
- * data have been returned, since we need to check the returned
- * ip header length.
- */
- #define ICMP_MINLEN 8 /* abs minimum */
- #define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
- #define ICMP_MASKLEN 12 /* address mask */
- #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
- #define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
- /* N.B.: must separately check that ip_hl >= 5 */
-
- /*
- * Definition of type and code field values.
- */
- #define ICMP_ECHOREPLY 0 /* echo reply */
- #define ICMP_UNREACH 3 /* dest unreachable, codes: */
- #define ICMP_UNREACH_NET 0 /* bad net */
- #define ICMP_UNREACH_HOST 1 /* bad host */
- #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
- #define ICMP_UNREACH_PORT 3 /* bad port */
- #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
- #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
- #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
- #define ICMP_REDIRECT 5 /* shorter route, codes: */
- #define ICMP_REDIRECT_NET 0 /* for network */
- #define ICMP_REDIRECT_HOST 1 /* for host */
- #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
- #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
- #define ICMP_ECHO 8 /* echo service */
- #define ICMP_TIMXCEED 11 /* time exceeded, code: */
- #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
- #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
- #define ICMP_PARAMPROB 12 /* ip header bad */
- #define ICMP_TSTAMP 13 /* timestamp request */
- #define ICMP_TSTAMPREPLY 14 /* timestamp reply */
- #define ICMP_IREQ 15 /* information request */
- #define ICMP_IREQREPLY 16 /* information reply */
- #define ICMP_MASKREQ 17 /* address mask request */
- #define ICMP_MASKREPLY 18 /* address mask reply */
-
- #define ICMP_MAXTYPE 18
-
- #define ICMP_INFOTYPE(type) \
- ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
- (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
- (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
- (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
-
- #define ICMP_MASK_RETRY_MAX 5 /* Max. retries for getting netmask */
-