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 1.8 2020/02/24 18:39:47 kamil Exp $");
25 #endif
26
27 /* \summary: IPv6 Routing Information Protocol (RIPng) printer */
28
29 #ifdef HAVE_CONFIG_H
30 #include "config.h"
31 #endif
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 struct in6_addr rip6_dest;
74 uint16_t rip6_tag;
75 uint8_t rip6_plen;
76 uint8_t rip6_metric;
77 };
78
79 struct rip6 {
80 uint8_t rip6_cmd;
81 uint8_t rip6_vers;
82 uint8_t rip6_res1[2];
83 union {
84 struct netinfo6 ru6_nets[1];
85 char ru6_tracefile[1];
86 } rip6un;
87 #define rip6_nets rip6un.ru6_nets
88 #define rip6_tracefile rip6un.ru6_tracefile
89 };
90
91 #define HOPCNT_INFINITY6 16
92
93 #if !defined(IN6_IS_ADDR_UNSPECIFIED) && !defined(_MSC_VER) /* MSVC inline */
IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr * addr)94 static int IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr *addr)
95 {
96 static const struct in6_addr in6addr_any; /* :: */
97 return (memcmp(addr, &in6addr_any, sizeof(*addr)) == 0);
98 }
99 #endif
100
101 static int
rip6_entry_print(netdissect_options * ndo,register const struct netinfo6 * ni,int metric)102 rip6_entry_print(netdissect_options *ndo, register const struct netinfo6 *ni, int metric)
103 {
104 int l;
105 l = ND_PRINT((ndo, "%s/%d", ip6addr_string(ndo, &ni->rip6_dest), ni->rip6_plen));
106 if (ni->rip6_tag)
107 l += ND_PRINT((ndo, " [%d]", EXTRACT_16BITS(&ni->rip6_tag)));
108 if (metric)
109 l += ND_PRINT((ndo, " (%d)", ni->rip6_metric));
110 return l;
111 }
112
113 UNALIGNED_OK
114 void
ripng_print(netdissect_options * ndo,const u_char * dat,unsigned int length)115 ripng_print(netdissect_options *ndo, const u_char *dat, unsigned int length)
116 {
117 register const struct rip6 *rp = (const struct rip6 *)dat;
118 register const struct netinfo6 *ni;
119 unsigned int length_left;
120 u_int j;
121
122 ND_TCHECK(rp->rip6_cmd);
123 switch (rp->rip6_cmd) {
124
125 case RIP6_REQUEST:
126 length_left = length;
127 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
128 goto trunc;
129 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
130 j = length_left / sizeof(*ni);
131 if (j == 1) {
132 ND_TCHECK(rp->rip6_nets);
133 if (rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6
134 && IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
135 ND_PRINT((ndo, " ripng-req dump"));
136 break;
137 }
138 }
139 if (j * sizeof(*ni) != length_left)
140 ND_PRINT((ndo, " ripng-req %u[%u]:", j, length));
141 else
142 ND_PRINT((ndo, " ripng-req %u:", j));
143 for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
144 length_left -= sizeof(*ni), ++ni) {
145 ND_TCHECK(*ni);
146 if (ndo->ndo_vflag > 1)
147 ND_PRINT((ndo, "\n\t"));
148 else
149 ND_PRINT((ndo, " "));
150 rip6_entry_print(ndo, ni, 0);
151 }
152 if (length_left != 0)
153 goto trunc;
154 break;
155 case RIP6_RESPONSE:
156 length_left = length;
157 if (length_left < (sizeof(struct rip6) - sizeof(struct netinfo6)))
158 goto trunc;
159 length_left -= (sizeof(struct rip6) - sizeof(struct netinfo6));
160 j = length_left / sizeof(*ni);
161 if (j * sizeof(*ni) != length_left)
162 ND_PRINT((ndo, " ripng-resp %d[%u]:", j, length));
163 else
164 ND_PRINT((ndo, " ripng-resp %d:", j));
165 for (ni = rp->rip6_nets; length_left >= sizeof(*ni);
166 length_left -= sizeof(*ni), ++ni) {
167 ND_TCHECK(*ni);
168 if (ndo->ndo_vflag > 1)
169 ND_PRINT((ndo, "\n\t"));
170 else
171 ND_PRINT((ndo, " "));
172 rip6_entry_print(ndo, ni, ni->rip6_metric);
173 }
174 if (length_left != 0)
175 goto trunc;
176 break;
177 default:
178 ND_PRINT((ndo, " ripng-%d ?? %u", rp->rip6_cmd, length));
179 break;
180 }
181 ND_TCHECK(rp->rip6_vers);
182 if (rp->rip6_vers != RIP6_VERSION)
183 ND_PRINT((ndo, " [vers %d]", rp->rip6_vers));
184 return;
185
186 trunc:
187 ND_PRINT((ndo, "[|ripng]"));
188 return;
189 }
190