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
67 struct netinfo6 {
68 struct in6_addr rip6_dest;
69 uint16_t rip6_tag;
70 uint8_t rip6_plen;
71 uint8_t rip6_metric;
72 };
73
74 struct 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 */
IN6_IS_ADDR_UNSPECIFIED(const struct in6_addr * addr)89 static 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
96 static int
rip6_entry_print(netdissect_options * ndo,register const struct netinfo6 * ni,int metric)97 rip6_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
108 void
ripng_print(netdissect_options * ndo,const u_char * dat,unsigned int length)109 ripng_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 register u_int amt;
114 register u_int i;
115 int j;
116 int trunc;
117
118 if (ndo->ndo_snapend < dat)
119 return;
120 amt = ndo->ndo_snapend - dat;
121 i = min(length, amt);
122 if (i < (sizeof(struct rip6) - sizeof(struct netinfo6)))
123 return;
124 i -= (sizeof(struct rip6) - sizeof(struct netinfo6));
125
126 switch (rp->rip6_cmd) {
127
128 case RIP6_REQUEST:
129 j = length / sizeof(*ni);
130 if (j == 1
131 && rp->rip6_nets->rip6_metric == HOPCNT_INFINITY6
132 && IN6_IS_ADDR_UNSPECIFIED(&rp->rip6_nets->rip6_dest)) {
133 ND_PRINT((ndo, " ripng-req dump"));
134 break;
135 }
136 if (j * sizeof(*ni) != length - 4)
137 ND_PRINT((ndo, " ripng-req %d[%u]:", j, length));
138 else
139 ND_PRINT((ndo, " ripng-req %d:", j));
140 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
141 for (ni = rp->rip6_nets; i >= sizeof(*ni);
142 i -= sizeof(*ni), ++ni) {
143 if (ndo->ndo_vflag > 1)
144 ND_PRINT((ndo, "\n\t"));
145 else
146 ND_PRINT((ndo, " "));
147 rip6_entry_print(ndo, ni, 0);
148 }
149 break;
150 case RIP6_RESPONSE:
151 j = length / sizeof(*ni);
152 if (j * sizeof(*ni) != length - 4)
153 ND_PRINT((ndo, " ripng-resp %d[%u]:", j, length));
154 else
155 ND_PRINT((ndo, " ripng-resp %d:", j));
156 trunc = ((i / sizeof(*ni)) * sizeof(*ni) != i);
157 for (ni = rp->rip6_nets; i >= sizeof(*ni);
158 i -= sizeof(*ni), ++ni) {
159 if (ndo->ndo_vflag > 1)
160 ND_PRINT((ndo, "\n\t"));
161 else
162 ND_PRINT((ndo, " "));
163 rip6_entry_print(ndo, ni, ni->rip6_metric);
164 }
165 if (trunc)
166 ND_PRINT((ndo, "[|ripng]"));
167 break;
168 default:
169 ND_PRINT((ndo, " ripng-%d ?? %u", rp->rip6_cmd, length));
170 break;
171 }
172 if (rp->rip6_vers != RIP6_VERSION)
173 ND_PRINT((ndo, " [vers %d]", rp->rip6_vers));
174 }
175