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    1: /*
    2:  * Copyright (c) 1982, 1986, 1993
    3:  *	The Regents of the University of California.  All rights reserved.
    4:  *
    5:  * Redistribution and use in source and binary forms, with or without
    6:  * modification, are permitted provided that the following conditions
    7:  * are met:
    8:  * 1. Redistributions of source code must retain the above copyright
    9:  *    notice, this list of conditions and the following disclaimer.
   10:  * 2. Redistributions in binary form must reproduce the above copyright
   11:  *    notice, this list of conditions and the following disclaimer in the
   12:  *    documentation and/or other materials provided with the distribution.
   13:  * 3. Neither the name of the University nor the names of its contributors
   14:  *    may be used to endorse or promote products derived from this software
   15:  *    without specific prior written permission.
   16:  *
   17:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27:  * SUCH DAMAGE.
   28:  *
   29:  *	@(#)ip_icmp.h	8.1 (Berkeley) 6/10/93
   30:  * ip_icmp.h,v 1.4 1995/05/30 08:09:43 rgrimes Exp
   31:  */
   32: 
   33: #ifndef _NETINET_IP_ICMP_H_
   34: #define _NETINET_IP_ICMP_H_
   35: 
   36: /*
   37:  * Interface Control Message Protocol Definitions.
   38:  * Per RFC 792, September 1981.
   39:  */
   40: 
   41: typedef u_int32_t n_time;
   42: 
   43: /*
   44:  * Structure of an icmp header.
   45:  */
   46: struct icmp {
   47: 	u_char	icmp_type;		/* type of message, see below */
   48: 	u_char	icmp_code;		/* type sub code */
   49: 	u_short	icmp_cksum;		/* ones complement cksum of struct */
   50: 	union {
   51: 		u_char ih_pptr;			/* ICMP_PARAMPROB */
   52: 		struct in_addr ih_gwaddr;	/* ICMP_REDIRECT */
   53: 		struct ih_idseq {
   54: 			u_short	icd_id;
   55: 			u_short	icd_seq;
   56: 		} ih_idseq;
   57: 		int ih_void;
   58: 
   59: 		/* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
   60: 		struct ih_pmtu {
   61: 			u_short ipm_void;
   62: 			u_short ipm_nextmtu;
   63: 		} ih_pmtu;
   64: 	} icmp_hun;
   65: #define	icmp_pptr	icmp_hun.ih_pptr
   66: #define	icmp_gwaddr	icmp_hun.ih_gwaddr
   67: #define	icmp_id		icmp_hun.ih_idseq.icd_id
   68: #define	icmp_seq	icmp_hun.ih_idseq.icd_seq
   69: #define	icmp_void	icmp_hun.ih_void
   70: #define	icmp_pmvoid	icmp_hun.ih_pmtu.ipm_void
   71: #define	icmp_nextmtu	icmp_hun.ih_pmtu.ipm_nextmtu
   72: 	union {
   73: 		struct id_ts {
   74: 			n_time its_otime;
   75: 			n_time its_rtime;
   76: 			n_time its_ttime;
   77: 		} id_ts;
   78: 		struct id_ip  {
   79: 			struct ip idi_ip;
   80: 			/* options and then 64 bits of data */
   81: 		} id_ip;
   82: 		uint32_t	id_mask;
   83: 		char		id_data[1];
   84: 	} icmp_dun;
   85: #define	icmp_otime	icmp_dun.id_ts.its_otime
   86: #define	icmp_rtime	icmp_dun.id_ts.its_rtime
   87: #define	icmp_ttime	icmp_dun.id_ts.its_ttime
   88: #define	icmp_ip		icmp_dun.id_ip.idi_ip
   89: #define	icmp_mask	icmp_dun.id_mask
   90: #define	icmp_data	icmp_dun.id_data
   91: };
   92: 
   93: /*
   94:  * Lower bounds on packet lengths for various types.
   95:  * For the error advice packets must first insure that the
   96:  * packet is large enought to contain the returned ip header.
   97:  * Only then can we do the check to see if 64 bits of packet
   98:  * data have been returned, since we need to check the returned
   99:  * ip header length.
  100:  */
  101: #define	ICMP_MINLEN	8				/* abs minimum */
  102: #define	ICMP_TSLEN	(8 + 3 * sizeof (n_time))	/* timestamp */
  103: #define	ICMP_MASKLEN	12				/* address mask */
  104: #define	ICMP_ADVLENMIN	(8 + sizeof (struct ip) + 8)	/* min */
  105: #define	ICMP_ADVLEN(p)	(8 + ((p)->icmp_ip.ip_hl << 2) + 8)
  106: 	/* N.B.: must separately check that ip_hl >= 5 */
  107: 
  108: /*
  109:  * Definition of type and code field values.
  110:  */
  111: #define	ICMP_ECHOREPLY		0		/* echo reply */
  112: #define	ICMP_UNREACH		3		/* dest unreachable, codes: */
  113: #define		ICMP_UNREACH_NET	0		/* bad net */
  114: #define		ICMP_UNREACH_HOST	1		/* bad host */
  115: #define		ICMP_UNREACH_PROTOCOL	2		/* bad protocol */
  116: #define		ICMP_UNREACH_PORT	3		/* bad port */
  117: #define		ICMP_UNREACH_NEEDFRAG	4		/* IP_DF caused drop */
  118: #define		ICMP_UNREACH_SRCFAIL	5		/* src route failed */
  119: #define		ICMP_UNREACH_NET_UNKNOWN 6		/* unknown net */
  120: #define		ICMP_UNREACH_HOST_UNKNOWN 7		/* unknown host */
  121: #define		ICMP_UNREACH_ISOLATED	8		/* src host isolated */
  122: #define		ICMP_UNREACH_NET_PROHIB	9		/* prohibited access */
  123: #define		ICMP_UNREACH_HOST_PROHIB 10		/* ditto */
  124: #define		ICMP_UNREACH_TOSNET	11		/* bad tos for net */
  125: #define		ICMP_UNREACH_TOSHOST	12		/* bad tos for host */
  126: #define	ICMP_SOURCEQUENCH	4		/* packet lost, slow down */
  127: #define	ICMP_REDIRECT		5		/* shorter route, codes: */
  128: #define		ICMP_REDIRECT_NET	0		/* for network */
  129: #define		ICMP_REDIRECT_HOST	1		/* for host */
  130: #define		ICMP_REDIRECT_TOSNET	2		/* for tos and net */
  131: #define		ICMP_REDIRECT_TOSHOST	3		/* for tos and host */
  132: #define	ICMP_ECHO		8		/* echo service */
  133: #define	ICMP_ROUTERADVERT	9		/* router advertisement */
  134: #define	ICMP_ROUTERSOLICIT	10		/* router solicitation */
  135: #define	ICMP_TIMXCEED		11		/* time exceeded, code: */
  136: #define		ICMP_TIMXCEED_INTRANS	0		/* ttl==0 in transit */
  137: #define		ICMP_TIMXCEED_REASS	1		/* ttl==0 in reass */
  138: #define	ICMP_PARAMPROB		12		/* ip header bad */
  139: #define		ICMP_PARAMPROB_OPTABSENT 1		/* req. opt. absent */
  140: #define	ICMP_TSTAMP		13		/* timestamp request */
  141: #define	ICMP_TSTAMPREPLY	14		/* timestamp reply */
  142: #define	ICMP_IREQ		15		/* information request */
  143: #define	ICMP_IREQREPLY		16		/* information reply */
  144: #define	ICMP_MASKREQ		17		/* address mask request */
  145: #define	ICMP_MASKREPLY		18		/* address mask reply */
  146: 
  147: #define	ICMP_MAXTYPE		18
  148: 
  149: #define	ICMP_INFOTYPE(type) \
  150: 	((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
  151: 	(type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
  152: 	(type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
  153: 	(type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
  154: 	(type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
  155: 
  156: void icmp_input(struct mbuf *, int);
  157: void icmp_error(struct mbuf *msrc, u_char type, u_char code, int minsize,
  158:                 const char *message);
  159: void icmp_reflect(struct mbuf *);
  160: 
  161: #endif