2 * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1996
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
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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
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17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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22 /* \summary: Routing Information Protocol (RIP) printer */
24 /* specification: RFC 1058, RFC 2453, RFC 4822 */
30 #include "netdissect-stdinc.h"
32 #include "netdissect.h"
33 #include "addrtoname.h"
40 * RFC 1058 and RFC 2453 header of packet.
43 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
45 * | Command (1) | Version (1) | unused |
46 * +---------------+---------------+-------------------------------+
49 nd_uint8_t rip_cmd; /* request/response */
50 nd_uint8_t rip_vers; /* protocol version # */
51 nd_byte unused[2]; /* unused */
54 #define RIPCMD_REQUEST 1 /* want info */
55 #define RIPCMD_RESPONSE 2 /* responding to request */
56 #define RIPCMD_TRACEON 3 /* turn tracing on */
57 #define RIPCMD_TRACEOFF 4 /* turn it off */
58 #define RIPCMD_POLL 5 /* want info from everybody */
59 #define RIPCMD_POLLENTRY 6 /* poll for entry */
61 static const struct tok rip_cmd_values[] = {
62 { RIPCMD_REQUEST, "Request" },
63 { RIPCMD_RESPONSE, "Response" },
64 { RIPCMD_TRACEON, "Trace on" },
65 { RIPCMD_TRACEOFF, "Trace off" },
66 { RIPCMD_POLL, "Poll" },
67 { RIPCMD_POLLENTRY, "Poll Entry" },
71 #define RIP_AUTHLEN 16
72 #define RIP_ROUTELEN 20
75 * First 4 bytes of all RIPv1/RIPv2 entries.
77 struct rip_entry_header {
78 nd_uint16_t rip_family;
86 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
87 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
88 * | Address Family Identifier (2) | must be zero (2) |
89 * +-------------------------------+-------------------------------+
91 * +---------------------------------------------------------------+
92 * | must be zero (4) |
93 * +---------------------------------------------------------------+
94 * | must be zero (4) |
95 * +---------------------------------------------------------------+
97 * +---------------------------------------------------------------+
99 struct rip_netinfo_v1 {
100 nd_uint16_t rip_family;
105 nd_uint32_t rip_metric; /* cost of route */
110 * RFC 2453 route entry
113 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
114 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
115 * | Address Family Identifier (2) | Route Tag (2) |
116 * +-------------------------------+-------------------------------+
118 * +---------------------------------------------------------------+
119 * | Subnet Mask (4) |
120 * +---------------------------------------------------------------+
122 * +---------------------------------------------------------------+
124 * +---------------------------------------------------------------+
128 struct rip_netinfo_v2 {
129 nd_uint16_t rip_family;
132 nd_uint32_t rip_dest_mask;
134 nd_uint32_t rip_metric; /* cost of route */
138 * RFC 2453 authentication entry
141 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
142 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
143 * | 0xFFFF | Authentication Type (2) |
144 * +-------------------------------+-------------------------------+
145 * - Authentication (16) -
146 * +---------------------------------------------------------------+
150 nd_uint16_t rip_family;
152 nd_byte rip_auth[16];
156 * RFC 4822 Cryptographic Authentication entry.
159 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
160 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
161 * | RIPv2 Packet Length | Key ID | Auth Data Len |
162 * +---------------+---------------+---------------+---------------+
163 * | Sequence Number (non-decreasing) |
164 * +---------------+---------------+---------------+---------------+
165 * | reserved must be zero |
166 * +---------------+---------------+---------------+---------------+
167 * | reserved must be zero |
168 * +---------------+---------------+---------------+---------------+
170 struct rip_auth_crypto_v2 {
171 nd_uint16_t rip_packet_len;
172 nd_uint8_t rip_key_id;
173 nd_uint8_t rip_auth_data_len;
174 nd_uint32_t rip_seq_num;
180 rip_entry_print_v1(netdissect_options *ndo, const u_char *p,
183 const struct rip_entry_header *eh = (const struct rip_entry_header *)p;
185 const struct rip_netinfo_v1 *ni = (const struct rip_netinfo_v1 *)p;
188 if (remaining < RIP_ROUTELEN)
191 family = GET_BE_U_2(ni->rip_family);
192 if (family != BSD_AFNUM_INET && family != 0) {
193 ND_PRINT("\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family));
194 print_unknown_data(ndo, p + sizeof(*eh), "\n\t ", RIP_ROUTELEN - sizeof(*eh));
195 return (RIP_ROUTELEN);
197 if (GET_BE_U_2(ni->rip_mbz1) ||
198 GET_BE_U_4(ni->rip_mbz2) ||
199 GET_BE_U_4(ni->rip_mbz3)) {
200 /* MBZ fields not zero */
201 print_unknown_data(ndo, p, "\n\t ", RIP_ROUTELEN);
202 return (RIP_ROUTELEN);
205 ND_PRINT("\n\t AFI 0, %s, metric: %u",
206 GET_IPADDR_STRING(ni->rip_dest),
207 GET_BE_U_4(ni->rip_metric));
208 return (RIP_ROUTELEN);
209 } /* BSD_AFNUM_INET */
210 ND_PRINT("\n\t %s, metric: %u",
211 GET_IPADDR_STRING(ni->rip_dest),
212 GET_BE_U_4(ni->rip_metric));
213 return (RIP_ROUTELEN);
219 rip_entry_print_v2(netdissect_options *ndo, const u_char *p,
222 const struct rip_entry_header *eh = (const struct rip_entry_header *)p;
224 const struct rip_netinfo_v2 *ni;
226 if (remaining < sizeof(*eh))
229 family = GET_BE_U_2(eh->rip_family);
230 if (family == 0xFFFF) { /* variable-sized authentication structures */
231 uint16_t auth_type = GET_BE_U_2(eh->rip_tag);
234 remaining -= sizeof(*eh);
235 if (auth_type == 2) {
236 ND_PRINT("\n\t Simple Text Authentication data: ");
237 nd_printjnp(ndo, p, RIP_AUTHLEN);
238 } else if (auth_type == 3) {
239 const struct rip_auth_crypto_v2 *ch;
241 ch = (const struct rip_auth_crypto_v2 *)p;
243 if (remaining < sizeof(*ch))
245 ND_PRINT("\n\t Auth header:");
246 ND_PRINT(" Packet Len %u,",
247 GET_BE_U_2(ch->rip_packet_len));
248 ND_PRINT(" Key-ID %u,", GET_U_1(ch->rip_key_id));
249 ND_PRINT(" Auth Data Len %u,",
250 GET_U_1(ch->rip_auth_data_len));
251 ND_PRINT(" SeqNo %u,", GET_BE_U_4(ch->rip_seq_num));
252 ND_PRINT(" MBZ %u,", GET_BE_U_4(ch->rip_mbz1));
253 ND_PRINT(" MBZ %u", GET_BE_U_4(ch->rip_mbz2));
254 } else if (auth_type == 1) {
255 ND_PRINT("\n\t Auth trailer:");
256 print_unknown_data(ndo, p, "\n\t ", remaining);
257 return (sizeof(*eh) + remaining); /* AT spans till the packet end */
259 ND_PRINT("\n\t Unknown (%u) Authentication data:",
261 print_unknown_data(ndo, p, "\n\t ", remaining);
262 return (sizeof(*eh) + remaining); /* we don't know how long this is, so we go to the packet end */
264 } else if (family != BSD_AFNUM_INET && family != 0) {
265 ND_PRINT("\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family));
266 print_unknown_data(ndo, p + sizeof(*eh), "\n\t ", RIP_ROUTELEN - sizeof(*eh));
267 } else { /* BSD_AFNUM_INET or AFI 0 */
268 ni = (const struct rip_netinfo_v2 *)p;
270 if (remaining < sizeof(*ni))
272 ND_PRINT("\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
273 tok2str(bsd_af_values, "%u", family),
274 GET_IPADDR_STRING(ni->rip_dest),
275 mask2plen(GET_BE_U_4(ni->rip_dest_mask)),
276 GET_BE_U_2(ni->rip_tag),
277 GET_BE_U_4(ni->rip_metric));
278 if (GET_BE_U_4(ni->rip_router))
279 ND_PRINT("%s", GET_IPADDR_STRING(ni->rip_router));
283 return (RIP_ROUTELEN);
289 rip_print(netdissect_options *ndo,
290 const u_char *dat, u_int length)
292 const struct rip *rp;
295 u_int len, routecount;
298 ndo->ndo_protocol = "rip";
299 if (ndo->ndo_snapend < dat) {
303 len = ND_BYTES_AVAILABLE_AFTER(dat);
306 if (len < sizeof(*rp)) {
312 rp = (const struct rip *)dat;
315 vers = GET_U_1(rp->rip_vers);
317 (ndo->ndo_vflag >= 1) ? "\n\t" : "",
324 * XXX - RFC 1058 says
326 * 0 Datagrams whose version number is zero are to be ignored.
327 * These are from a previous version of the protocol, whose
328 * packet format was machine-specific.
330 * so perhaps we should just dump the packet, in hex.
332 print_unknown_data(ndo, (const uint8_t *)&rp->rip_cmd, "\n\t", length);
336 /* dump version and lets see if we know the commands name*/
337 cmd = GET_U_1(rp->rip_cmd);
338 ND_PRINT(", %s, length: %u",
339 tok2str(rip_cmd_values, "unknown command (%u)", cmd),
342 if (ndo->ndo_vflag < 1)
348 case RIPCMD_RESPONSE:
352 routecount = length / RIP_ROUTELEN;
353 ND_PRINT(", routes: %u", routecount);
354 p = (const u_char *)(rp + 1);
356 entry_size = rip_entry_print_v1(ndo, p, len);
357 if (entry_size == 0) {
362 if (len < entry_size) {
363 ND_PRINT(" [remaining entries length %u < %u]",
365 nd_print_invalid(ndo);
374 routecount = length / RIP_ROUTELEN;
375 ND_PRINT(", routes: %u or less", routecount);
376 p = (const u_char *)(rp + 1);
378 entry_size = rip_entry_print_v2(ndo, p, len);
379 if (entry_size == 0) {
384 if (len < entry_size) {
385 ND_PRINT(" [remaining entries length %u < %u]",
387 nd_print_invalid(ndo);
396 ND_PRINT(", unknown version");
401 case RIPCMD_TRACEOFF:
403 case RIPCMD_POLLENTRY:
409 if (ndo->ndo_vflag <= 1) {
410 if (!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length))
415 /* do we want to see an additionally hexdump ? */
416 if (ndo->ndo_vflag> 1) {
417 if (!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length))