src/slirp/ip_icmp.h

/*
 * Copyright (c) 1982, 1986, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)ip_icmp.h   8.1 (Berkeley) 6/10/93
 * ip_icmp.h,v 1.4 1995/05/30 08:09:43 rgrimes Exp
 */

#ifndef _NETINET_IP_ICMP_H_
#define _NETINET_IP_ICMP_H_

/*
 * Interface Control Message Protocol Definitions.
 * Per RFC 792, September 1981.
 */

typedef u_int32_t n_time;

/*
 * Structure of an icmp header.
 */
#ifdef PRAGMA_PACK_SUPPORTED
#pragma pack(1)
#endif

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 {
                        u_short icd_id;
                        u_short icd_seq;
                } ih_idseq;
                int ih_void;

                /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
                struct ih_pmtu {
                        u_short ipm_void;
                        u_short ipm_nextmtu;
                } ih_pmtu;
        } 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
#define icmp_pmvoid     icmp_hun.ih_pmtu.ipm_void
#define icmp_nextmtu    icmp_hun.ih_pmtu.ipm_nextmtu
        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;
                uint32_t        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
} PACKED__;

#ifdef PRAGMA_PACK_SUPPORTED
#pragma pack(0)
#endif

/*
 * 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_UNREACH_NET_UNKNOWN 6              /* unknown net */
#define         ICMP_UNREACH_HOST_UNKNOWN 7             /* unknown host */
#define         ICMP_UNREACH_ISOLATED   8               /* src host isolated */
#define         ICMP_UNREACH_NET_PROHIB 9               /* prohibited access */
#define         ICMP_UNREACH_HOST_PROHIB 10             /* ditto */
#define         ICMP_UNREACH_TOSNET     11              /* bad tos for net */
#define         ICMP_UNREACH_TOSHOST    12              /* bad tos for host */
#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_ROUTERADVERT       9               /* router advertisement */
#define ICMP_ROUTERSOLICIT      10              /* router solicitation */
#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_PARAMPROB_OPTABSENT 1              /* req. opt. absent */
#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_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
        (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
        (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
        (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)

void icmp_input _P((struct mbuf *, int));
void icmp_error _P((struct mbuf *, u_char, u_char, int, char *));
void icmp_reflect _P((struct mbuf *));

#endif
Revision:	1.3
Committed:	2006-01-17T21:19:12Z (18 years, 5 months ago) by gbeauche
Content type:	text/plain
Branch:	MAIN
CVS Tags:	nigel-build-19
Changes since 1.2:	+9 -1 lines
Log Message:	Packet headers can be examined through unaligned addresses. This patch fixes this, especially for MIPS & SPARC platforms. [Initial patch from Brian J. Johnson]
#	Content
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. All advertising materials mentioning features or use of this software
14	* must display the following acknowledgement:
15	* This product includes software developed by the University of
16	* California, Berkeley and its contributors.
17	* 4. Neither the name of the University nor the names of its contributors
18	* may be used to endorse or promote products derived from this software
19	* without specific prior written permission.
20	*
21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31	* SUCH DAMAGE.
32	*
33	* @(#)ip_icmp.h 8.1 (Berkeley) 6/10/93
34	* ip_icmp.h,v 1.4 1995/05/30 08:09:43 rgrimes Exp
35	*/
36
37	#ifndef _NETINET_IP_ICMP_H_
38	#define _NETINET_IP_ICMP_H_
39
40	/*
41	* Interface Control Message Protocol Definitions.
42	* Per RFC 792, September 1981.
43	*/
44
45	typedef u_int32_t n_time;
46
47	/*
48	* Structure of an icmp header.
49	*/
50	#ifdef PRAGMA_PACK_SUPPORTED
51	#pragma pack(1)
52	#endif
53
54	struct icmp {
55	u_char icmp_type; /* type of message, see below */
56	u_char icmp_code; /* type sub code */
57	u_short icmp_cksum; /* ones complement cksum of struct */
58	union {
59	u_char ih_pptr; /* ICMP_PARAMPROB */
60	struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
61	struct ih_idseq {
62	u_short icd_id;
63	u_short icd_seq;
64	} ih_idseq;
65	int ih_void;
66
67	/* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
68	struct ih_pmtu {
69	u_short ipm_void;
70	u_short ipm_nextmtu;
71	} ih_pmtu;
72	} icmp_hun;
73	#define icmp_pptr icmp_hun.ih_pptr
74	#define icmp_gwaddr icmp_hun.ih_gwaddr
75	#define icmp_id icmp_hun.ih_idseq.icd_id
76	#define icmp_seq icmp_hun.ih_idseq.icd_seq
77	#define icmp_void icmp_hun.ih_void
78	#define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
79	#define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
80	union {
81	struct id_ts {
82	n_time its_otime;
83	n_time its_rtime;
84	n_time its_ttime;
85	} id_ts;
86	struct id_ip {
87	struct ip idi_ip;
88	/* options and then 64 bits of data */
89	} id_ip;
90	uint32_t id_mask;
91	char id_data[1];
92	} icmp_dun;
93	#define icmp_otime icmp_dun.id_ts.its_otime
94	#define icmp_rtime icmp_dun.id_ts.its_rtime
95	#define icmp_ttime icmp_dun.id_ts.its_ttime
96	#define icmp_ip icmp_dun.id_ip.idi_ip
97	#define icmp_mask icmp_dun.id_mask
98	#define icmp_data icmp_dun.id_data
99	} PACKED__;
100
101	#ifdef PRAGMA_PACK_SUPPORTED
102	#pragma pack(0)
103	#endif
104
105	/*
106	* Lower bounds on packet lengths for various types.
107	* For the error advice packets must first insure that the
108	* packet is large enought to contain the returned ip header.
109	* Only then can we do the check to see if 64 bits of packet
110	* data have been returned, since we need to check the returned
111	* ip header length.
112	*/
113	#define ICMP_MINLEN 8 /* abs minimum */
114	#define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
115	#define ICMP_MASKLEN 12 /* address mask */
116	#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
117	#define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
118	/* N.B.: must separately check that ip_hl >= 5 */
119
120	/*
121	* Definition of type and code field values.
122	*/
123	#define ICMP_ECHOREPLY 0 /* echo reply */
124	#define ICMP_UNREACH 3 /* dest unreachable, codes: */
125	#define ICMP_UNREACH_NET 0 /* bad net */
126	#define ICMP_UNREACH_HOST 1 /* bad host */
127	#define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
128	#define ICMP_UNREACH_PORT 3 /* bad port */
129	#define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
130	#define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
131	#define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
132	#define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
133	#define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
134	#define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
135	#define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
136	#define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
137	#define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
138	#define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
139	#define ICMP_REDIRECT 5 /* shorter route, codes: */
140	#define ICMP_REDIRECT_NET 0 /* for network */
141	#define ICMP_REDIRECT_HOST 1 /* for host */
142	#define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
143	#define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
144	#define ICMP_ECHO 8 /* echo service */
145	#define ICMP_ROUTERADVERT 9 /* router advertisement */
146	#define ICMP_ROUTERSOLICIT 10 /* router solicitation */
147	#define ICMP_TIMXCEED 11 /* time exceeded, code: */
148	#define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
149	#define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
150	#define ICMP_PARAMPROB 12 /* ip header bad */
151	#define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
152	#define ICMP_TSTAMP 13 /* timestamp request */
153	#define ICMP_TSTAMPREPLY 14 /* timestamp reply */
154	#define ICMP_IREQ 15 /* information request */
155	#define ICMP_IREQREPLY 16 /* information reply */
156	#define ICMP_MASKREQ 17 /* address mask request */
157	#define ICMP_MASKREPLY 18 /* address mask reply */
158
159	#define ICMP_MAXTYPE 18
160
161	#define ICMP_INFOTYPE(type) \
162	((type) == ICMP_ECHOREPLY \|\| (type) == ICMP_ECHO \|\| \
163	(type) == ICMP_ROUTERADVERT \|\| (type) == ICMP_ROUTERSOLICIT \|\| \
164	(type) == ICMP_TSTAMP \|\| (type) == ICMP_TSTAMPREPLY \|\| \
165	(type) == ICMP_IREQ \|\| (type) == ICMP_IREQREPLY \|\| \
166	(type) == ICMP_MASKREQ \|\| (type) == ICMP_MASKREPLY)
167
168	void icmp_input _P((struct mbuf *, int));
169	void icmp_error _P((struct mbuf , u_char, u_char, int, char ));
170	void icmp_reflect _P((struct mbuf *));
171
172	#endif