1/*
2 * Copyright (c) 1989, 1990, 1991, 1993, 1994
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: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22/* \summary: IPv6 Routing Information Protocol (RIPng) printer */
23
24#ifdef HAVE_CONFIG_H
25#include "config.h"
26#endif
27
28#include <netdissect-stdinc.h>
29
30#include "netdissect.h"
31#include "addrtoname.h"
32#include "extract.h"
33
34/*
35 * Copyright (C) 1995, 1996, 1997 and 1998 WIDE Project.
36 * All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 *    notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 *    notice, this list of conditions and the following disclaimer in the
45 *    documentation and/or other materials provided with the distribution.
46 * 3. Neither the name of the project nor the names of its contributors
47 *    may be used to endorse or promote products derived from this software
48 *    without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 */
62#define	RIP6_VERSION	1
63
64#define	RIP6_REQUEST	1
65#define	RIP6_RESPONSE	2
66
67struct netinfo6 {
68	struct in6_addr	rip6_dest;
69	uint16_t	rip6_tag;
70	uint8_t		rip6_plen;
71	uint8_t		rip6_metric;
72};
73
74struct	rip6 {
75	uint8_t		rip6_cmd;
76	uint8_t		rip6_vers;
77	uint8_t		rip6_res1[2];
78	union {
79		struct	netinfo6	ru6_nets[1];
80		char	ru6_tracefile[1];
81	} rip6un;
82#define	rip6_nets	rip6un.ru6_nets
83#define	rip6_tracefile	rip6un.ru6_tracefile
84};
85
86#define	HOPCNT_INFINITY6	16
87
88#if !defined(IN6_IS_ADDR_UNSPECIFIED) && !defined(_MSC_VER) /* MSVC inline */
89static int IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr *addr)
90{
91    static const struct in6_addr in6addr_any;        /* :: */
92    return (memcmp(addr, &in6addr_any, sizeof(*addr)) == 0);
93}
94#endif
95
96static int
97rip6_entry_print(netdissect_options *ndo, register const struct netinfo6 *ni, int metric)
98{
99	int l;
100	l = ND_PRINT((ndo, "%s/%d", ip6addr_string(ndo, &ni->rip6_dest), ni->rip6_plen));
101	if (ni->rip6_tag)
102		l += ND_PRINT((ndo, " [%d]", EXTRACT_16BITS(&ni->rip6_tag)));
103	if (metric)
104		l += ND_PRINT((ndo, " (%d)", ni->rip6_metric));
105	return l;
106}
107
108void
109ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length)
110{
111	register const struct rip6 *rp = (const struct rip6 *)dat;
112	register const struct netinfo6 *ni;
113	unsigned int length_left;
114	u_int j;
115
116	ND_TCHECK(rp->rip6_cmd);
117	switch (rp->rip6_cmd) {
118
119	case RIP6_REQUEST:
120		length_left = length;
121		if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
122			goto trunc;
123		length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
124 		j = length_left / sizeof(*ni);
125		if (j == 1) {
126			ND_TCHECK(rp->rip6_nets);
127			if (rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6
128			    &&  IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
129				ND_PRINT((ndo, " ripng-req dump"));
130				break;
131			}
132		}
133		if (j * sizeof(*ni) != length_left)
134			ND_PRINT((ndo, " ripng-req %u[%u]:", j, length));
135		else
136			ND_PRINT((ndo, " ripng-req %u:", j));
137		for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
138		    length_left -= sizeof(*ni), ++ni) {
139			ND_TCHECK(*ni);
140			if (ndo->ndo_vflag > 1)
141				ND_PRINT((ndo, "\n\t"));
142			else
143				ND_PRINT((ndo, " "));
144			rip6_entry_print(ndo, ni, 0);
145		}
146		if (length_left != 0)
147			goto trunc;
148		break;
149	case RIP6_RESPONSE:
150		length_left = length;
151		if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
152			goto trunc;
153		length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
154		j = length_left / sizeof(*ni);
155		if (j * sizeof(*ni) != length_left)
156			ND_PRINT((ndo, " ripng-resp %d[%u]:", j, length));
157		else
158			ND_PRINT((ndo, " ripng-resp %d:", j));
159		for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
160		    length_left -= sizeof(*ni), ++ni) {
161			ND_TCHECK(*ni);
162			if (ndo->ndo_vflag > 1)
163				ND_PRINT((ndo, "\n\t"));
164			else
165				ND_PRINT((ndo, " "));
166			rip6_entry_print(ndo, ni, ni->rip6_metric);
167		}
168		if (length_left != 0)
169			goto trunc;
170		break;
171	default:
172		ND_PRINT((ndo, " ripng-%d ?? %u", rp->rip6_cmd, length));
173		break;
174	}
175	ND_TCHECK(rp->rip6_vers);
176	if (rp->rip6_vers != RIP6_VERSION)
177		ND_PRINT((ndo, " [vers %d]", rp->rip6_vers));
178	return;
179
180trunc:
181	ND_PRINT((ndo, "[|ripng]"));
182	return;
183}
184