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 /* specification: RFC 2080 */
25
26 #include <config.h>
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
67 struct netinfo6 {
68 nd_ipv6 rip6_dest;
69 nd_uint16_t rip6_tag;
70 nd_uint8_t rip6_plen;
71 nd_uint8_t rip6_metric;
72 };
73
74 struct rip6 {
75 nd_uint8_t rip6_cmd;
76 nd_uint8_t rip6_vers;
77 nd_byte rip6_res1[2];
78 struct netinfo6 rip6_nets[1];
79 };
80
81 #define HOPCNT_INFINITY6 16
82
ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 * addr)83 static int ND_IN6_IS_ADDR_UNSPECIFIED(const nd_ipv6 *addr)
84 {
85 static const nd_ipv6 in6addr_any_val = { 0 }; /* :: */
86 return (memcmp(addr, &in6addr_any_val, sizeof(*addr)) == 0);
87 }
88
89 static void
rip6_entry_print(netdissect_options * ndo,const struct netinfo6 * ni,const u_int print_metric)90 rip6_entry_print(netdissect_options *ndo,
91 const struct netinfo6 *ni, const u_int print_metric)
92 {
93 uint16_t tag;
94 uint8_t metric;
95
96 ND_PRINT("%s/%u", GET_IP6ADDR_STRING(ni->rip6_dest),
97 GET_U_1(ni->rip6_plen));
98 tag = GET_BE_U_2(ni->rip6_tag);
99 if (tag)
100 ND_PRINT(" [%u]", tag);
101 metric = GET_U_1(ni->rip6_metric);
102 if (metric && print_metric)
103 ND_PRINT(" (%u)", metric);
104 }
105
106 void
ripng_print(netdissect_options * ndo,const u_char * dat,unsigned int length)107 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length)
108 {
109 const struct rip6 *rp = (const struct rip6 *)dat;
110 uint8_t cmd, vers;
111 const struct netinfo6 *ni;
112 unsigned int length_left;
113 u_int j;
114
115 ndo->ndo_protocol = "ripng";
116 vers = GET_U_1(rp->rip6_vers);
117 if (vers != RIP6_VERSION) {
118 nd_print_protocol(ndo);
119 ND_PRINT(" [version %u, must be %u]", vers, RIP6_VERSION);
120 goto invalid;
121 }
122 cmd = GET_U_1(rp->rip6_cmd);
123 switch (cmd) {
124
125 case RIP6_REQUEST:
126 length_left = length;
127 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
128 goto invalid;
129 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
130 j = length_left / sizeof(*ni);
131 if (j == 1) {
132 if (GET_U_1(rp->rip6_nets->rip6_metric) == HOPCNT_INFINITY6
133 && ND_IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
134 ND_PRINT(" ripng-req dump");
135 break;
136 }
137 }
138 if (j * sizeof(*ni) != length_left)
139 ND_PRINT(" ripng-req %u[%u]:", j, length);
140 else
141 ND_PRINT(" ripng-req %u:", j);
142 for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
143 length_left -= sizeof(*ni), ++ni) {
144 if (ndo->ndo_vflag > 1)
145 ND_PRINT("\n\t");
146 else
147 ND_PRINT(" ");
148 rip6_entry_print(ndo, ni, FALSE);
149 }
150 if (length_left != 0)
151 goto invalid;
152 break;
153 case RIP6_RESPONSE:
154 length_left = length;
155 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
156 goto invalid;
157 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
158 j = length_left / sizeof(*ni);
159 if (j * sizeof(*ni) != length_left)
160 ND_PRINT(" ripng-resp %u[%u]:", j, length);
161 else
162 ND_PRINT(" ripng-resp %u:", j);
163 for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
164 length_left -= sizeof(*ni), ++ni) {
165 if (ndo->ndo_vflag > 1)
166 ND_PRINT("\n\t");
167 else
168 ND_PRINT(" ");
169 rip6_entry_print(ndo, ni, TRUE);
170 }
171 if (length_left != 0)
172 goto invalid;
173 break;
174 default:
175 ND_PRINT(" ripng-%u ?? %u", cmd, length);
176 goto invalid;
177 }
178 return;
179
180 invalid:
181 nd_print_invalid(ndo);
182 }
183