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 #include <sys/cdefs.h>
23 #ifndef lint
24 __RCSID("$NetBSD: print-ripng.c,v 1.10 2024/09/02 16:15:32 christos Exp $");
25 #endif
26
27 /* \summary: IPv6 Routing Information Protocol (RIPng) printer */
28
29 /* specification: RFC 2080 */
30
31 #include <config.h>
32
33 #include "netdissect-stdinc.h"
34
35 #include "netdissect.h"
36 #include "addrtoname.h"
37 #include "extract.h"
38
39 /*
40 * Copyright (C) 1995, 1996, 1997 and 1998 WIDE Project.
41 * All rights reserved.
42 *
43 * Redistribution and use in source and binary forms, with or without
44 * modification, are permitted provided that the following conditions
45 * are met:
46 * 1. Redistributions of source code must retain the above copyright
47 * notice, this list of conditions and the following disclaimer.
48 * 2. Redistributions in binary form must reproduce the above copyright
49 * notice, this list of conditions and the following disclaimer in the
50 * documentation and/or other materials provided with the distribution.
51 * 3. Neither the name of the project nor the names of its contributors
52 * may be used to endorse or promote products derived from this software
53 * without specific prior written permission.
54 *
55 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
58 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * SUCH DAMAGE.
66 */
67 #define RIP6_VERSION 1
68
69 #define RIP6_REQUEST 1
70 #define RIP6_RESPONSE 2
71
72 struct netinfo6 {
73 nd_ipv6 rip6_dest;
74 nd_uint16_t rip6_tag;
75 nd_uint8_t rip6_plen;
76 nd_uint8_t rip6_metric;
77 };
78
79 struct rip6 {
80 nd_uint8_t rip6_cmd;
81 nd_uint8_t rip6_vers;
82 nd_byte rip6_res1[2];
83 struct netinfo6 rip6_nets[1];
84 };
85
86 #define HOPCNT_INFINITY6 16
87
ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 * addr)88 static int ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 *addr)
89 {
90 static const nd_ipv6 in6addr_any_val = { 0 }; /* :: */
91 return (memcmp(addr, &in6addr_any_val, sizeof(*addr)) == 0);
92 }
93
94 static void
rip6_entry_print(netdissect_options * ndo,const struct netinfo6 * ni,const u_int print_metric)95 rip6_entry_print(netdissect_options *ndo,
96 const struct netinfo6 *ni, const u_int print_metric)
97 {
98 uint16_t tag;
99 uint8_t metric;
100
101 ND_PRINT("%s/%u", GET_IP6ADDR_STRING(ni->rip6_dest),
102 GET_U_1(ni->rip6_plen));
103 tag = GET_BE_U_2(ni->rip6_tag);
104 if (tag)
105 ND_PRINT(" [%u]", tag);
106 metric = GET_U_1(ni->rip6_metric);
107 if (metric && print_metric)
108 ND_PRINT(" (%u)", metric);
109 }
110
111 UNALIGNED_OK
112 void
ripng_print(netdissect_options * ndo,const u_char * dat,unsigned int length)113 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length)
114 {
115 const struct rip6 *rp = (const struct rip6 *)dat;
116 uint8_t cmd, vers;
117 const struct netinfo6 *ni;
118 unsigned int length_left;
119 u_int j;
120
121 ndo->ndo_protocol = "ripng";
122 vers = GET_U_1(rp->rip6_vers);
123 if (vers != RIP6_VERSION) {
124 nd_print_protocol(ndo);
125 ND_PRINT(" [version %u, must be %u]", vers, RIP6_VERSION);
126 goto invalid;
127 }
128 cmd = GET_U_1(rp->rip6_cmd);
129 switch (cmd) {
130
131 case RIP6_REQUEST:
132 length_left = length;
133 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
134 goto invalid;
135 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
136 j = length_left / sizeof(*ni);
137 if (j == 1) {
138 if (GET_U_1(rp->rip6_nets->rip6_metric) == HOPCNT_INFINITY6
139 && ND_IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
140 ND_PRINT(" ripng-req dump");
141 break;
142 }
143 }
144 if (j * sizeof(*ni) != length_left)
145 ND_PRINT(" ripng-req %u[%u]:", j, length);
146 else
147 ND_PRINT(" ripng-req %u:", j);
148 for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
149 length_left -= sizeof(*ni), ++ni) {
150 if (ndo->ndo_vflag > 1)
151 ND_PRINT("\n\t");
152 else
153 ND_PRINT(" ");
154 rip6_entry_print(ndo, ni, FALSE);
155 }
156 if (length_left != 0)
157 goto invalid;
158 break;
159 case RIP6_RESPONSE:
160 length_left = length;
161 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
162 goto invalid;
163 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
164 j = length_left / sizeof(*ni);
165 if (j * sizeof(*ni) != length_left)
166 ND_PRINT(" ripng-resp %u[%u]:", j, length);
167 else
168 ND_PRINT(" ripng-resp %u:", j);
169 for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
170 length_left -= sizeof(*ni), ++ni) {
171 if (ndo->ndo_vflag > 1)
172 ND_PRINT("\n\t");
173 else
174 ND_PRINT(" ");
175 rip6_entry_print(ndo, ni, TRUE);
176 }
177 if (length_left != 0)
178 goto invalid;
179 break;
180 default:
181 ND_PRINT(" ripng-%u ?? %u", cmd, length);
182 goto invalid;
183 }
184 return;
185
186 invalid:
187 nd_print_invalid(ndo);
188 }
189