2 * Copyright (c) 1995, 1996
3 * The Regents of the University of California. All rights reserved.
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
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.
22 /* \summary: Distance Vector Multicast Routing Protocol printer */
28 #include <netdissect-stdinc.h>
30 #include "netdissect.h"
32 #include "addrtoname.h"
35 * DVMRP message types and flag values shamelessly stolen from
38 #define DVMRP_PROBE 1 /* for finding neighbors */
39 #define DVMRP_REPORT 2 /* for reporting some or all routes */
40 #define DVMRP_ASK_NEIGHBORS 3 /* sent by mapper, asking for a list */
41 /* of this router's neighbors */
42 #define DVMRP_NEIGHBORS 4 /* response to such a request */
43 #define DVMRP_ASK_NEIGHBORS2 5 /* as above, want new format reply */
44 #define DVMRP_NEIGHBORS2 6
45 #define DVMRP_PRUNE 7 /* prune message */
46 #define DVMRP_GRAFT 8 /* graft message */
47 #define DVMRP_GRAFT_ACK 9 /* graft acknowledgement */
50 * 'flags' byte values in DVMRP_NEIGHBORS2 reply.
52 #define DVMRP_NF_TUNNEL 0x01 /* neighbors reached via tunnel */
53 #define DVMRP_NF_SRCRT 0x02 /* tunnel uses IP source routing */
54 #define DVMRP_NF_DOWN 0x10 /* kernel state of interface */
55 #define DVMRP_NF_DISABLED 0x20 /* administratively disabled */
56 #define DVMRP_NF_QUERIER 0x40 /* I am the subnet's querier */
58 static int print_probe(netdissect_options *, const u_char *, const u_char *, u_int);
59 static int print_report(netdissect_options *, const u_char *, const u_char *, u_int);
60 static int print_neighbors(netdissect_options *, const u_char *, const u_char *, u_int);
61 static int print_neighbors2(netdissect_options *, const u_char *, const u_char *, u_int);
62 static int print_prune(netdissect_options *, const u_char *);
63 static int print_graft(netdissect_options *, const u_char *);
64 static int print_graft_ack(netdissect_options *, const u_char *);
66 static uint32_t target_level;
69 dvmrp_print(netdissect_options *ndo,
70 register const u_char *bp, register u_int len)
72 register const u_char *ep;
75 ep = (const u_char *)ndo->ndo_snapend;
82 /* Skip IGMP header */
89 ND_PRINT((ndo, " Probe"));
91 if (print_probe(ndo, bp, ep, len) < 0)
97 ND_PRINT((ndo, " Report"));
98 if (ndo->ndo_vflag > 1) {
99 if (print_report(ndo, bp, ep, len) < 0)
104 case DVMRP_ASK_NEIGHBORS:
105 ND_PRINT((ndo, " Ask-neighbors(old)"));
108 case DVMRP_NEIGHBORS:
109 ND_PRINT((ndo, " Neighbors(old)"));
110 if (print_neighbors(ndo, bp, ep, len) < 0)
114 case DVMRP_ASK_NEIGHBORS2:
115 ND_PRINT((ndo, " Ask-neighbors2"));
118 case DVMRP_NEIGHBORS2:
119 ND_PRINT((ndo, " Neighbors2"));
121 * extract version and capabilities from IGMP group
125 ND_TCHECK2(bp[0], 4);
126 target_level = (bp[0] << 24) | (bp[1] << 16) |
127 (bp[2] << 8) | bp[3];
129 if (print_neighbors2(ndo, bp, ep, len) < 0)
134 ND_PRINT((ndo, " Prune"));
135 if (print_prune(ndo, bp) < 0)
140 ND_PRINT((ndo, " Graft"));
141 if (print_graft(ndo, bp) < 0)
145 case DVMRP_GRAFT_ACK:
146 ND_PRINT((ndo, " Graft-ACK"));
147 if (print_graft_ack(ndo, bp) < 0)
152 ND_PRINT((ndo, " [type %d]", type));
158 ND_PRINT((ndo, "[|dvmrp]"));
163 print_report(netdissect_options *ndo,
164 register const u_char *bp, register const u_char *ep,
167 register uint32_t mask, origin;
168 register int metric, done;
169 register u_int i, width;
173 ND_PRINT((ndo, " [|]"));
176 ND_TCHECK2(bp[0], 3);
177 mask = (uint32_t)0xff << 24 | bp[0] << 16 | bp[1] << 8 | bp[2];
186 ND_PRINT((ndo, "\n\tMask %s", intoa(htonl(mask))));
190 if (bp + width + 1 > ep) {
191 ND_PRINT((ndo, " [|]"));
194 if (len < width + 1) {
195 ND_PRINT((ndo, "\n\t [Truncated Report]"));
199 for (i = 0; i < width; ++i) {
201 origin = origin << 8 | *bp++;
208 done = metric & 0x80;
210 ND_PRINT((ndo, "\n\t %s metric %d", intoa(htonl(origin)),
221 print_probe(netdissect_options *ndo,
222 register const u_char *bp, register const u_char *ep,
225 register uint32_t genid;
227 ND_TCHECK2(bp[0], 4);
228 if ((len < 4) || ((bp + 4) > ep)) {
230 ND_PRINT((ndo, " [|}"));
233 genid = (bp[0] << 24) | (bp[1] << 16) | (bp[2] << 8) | bp[3];
236 ND_PRINT((ndo, ndo->ndo_vflag > 1 ? "\n\t" : " "));
237 ND_PRINT((ndo, "genid %u", genid));
238 if (ndo->ndo_vflag < 2)
241 while ((len > 0) && (bp < ep)) {
242 ND_TCHECK2(bp[0], 4);
243 ND_PRINT((ndo, "\n\tneighbor %s", ipaddr_string(ndo, bp)));
252 print_neighbors(netdissect_options *ndo,
253 register const u_char *bp, register const u_char *ep,
257 register u_char metric;
258 register u_char thresh;
261 while (len > 0 && bp < ep) {
262 ND_TCHECK2(bp[0], 7);
269 while (--ncount >= 0) {
270 ND_TCHECK2(bp[0], 4);
271 ND_PRINT((ndo, " [%s ->", ipaddr_string(ndo, laddr)));
272 ND_PRINT((ndo, " %s, (%d/%d)]",
273 ipaddr_string(ndo, bp), metric, thresh));
284 print_neighbors2(netdissect_options *ndo,
285 register const u_char *bp, register const u_char *ep,
289 register u_char metric, thresh, flags;
292 ND_PRINT((ndo, " (v %d.%d):",
293 (int)target_level & 0xff,
294 (int)(target_level >> 8) & 0xff));
296 while (len > 0 && bp < ep) {
297 ND_TCHECK2(bp[0], 8);
305 while (--ncount >= 0 && (len >= 4) && (bp + 4) <= ep) {
306 ND_PRINT((ndo, " [%s -> ", ipaddr_string(ndo, laddr)));
307 ND_PRINT((ndo, "%s (%d/%d", ipaddr_string(ndo, bp),
309 if (flags & DVMRP_NF_TUNNEL)
310 ND_PRINT((ndo, "/tunnel"));
311 if (flags & DVMRP_NF_SRCRT)
312 ND_PRINT((ndo, "/srcrt"));
313 if (flags & DVMRP_NF_QUERIER)
314 ND_PRINT((ndo, "/querier"));
315 if (flags & DVMRP_NF_DISABLED)
316 ND_PRINT((ndo, "/disabled"));
317 if (flags & DVMRP_NF_DOWN)
318 ND_PRINT((ndo, "/down"));
319 ND_PRINT((ndo, ")]"));
324 ND_PRINT((ndo, " [|]"));
334 print_prune(netdissect_options *ndo,
335 register const u_char *bp)
337 ND_TCHECK2(bp[0], 12);
338 ND_PRINT((ndo, " src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4)));
340 ND_PRINT((ndo, " timer "));
341 unsigned_relts_print(ndo, EXTRACT_32BITS(bp));
348 print_graft(netdissect_options *ndo,
349 register const u_char *bp)
351 ND_TCHECK2(bp[0], 8);
352 ND_PRINT((ndo, " src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4)));
359 print_graft_ack(netdissect_options *ndo,
360 register const u_char *bp)
362 ND_TCHECK2(bp[0], 8);
363 ND_PRINT((ndo, " src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4)));