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 #define NETDISSECT_REWORKED
27 #include <tcpdump-stdinc.h>
29 #include "interface.h"
31 #include "addrtoname.h"
34 * DVMRP message types and flag values shamelessly stolen from
37 #define DVMRP_PROBE 1 /* for finding neighbors */
38 #define DVMRP_REPORT 2 /* for reporting some or all routes */
39 #define DVMRP_ASK_NEIGHBORS 3 /* sent by mapper, asking for a list */
40 /* of this router's neighbors */
41 #define DVMRP_NEIGHBORS 4 /* response to such a request */
42 #define DVMRP_ASK_NEIGHBORS2 5 /* as above, want new format reply */
43 #define DVMRP_NEIGHBORS2 6
44 #define DVMRP_PRUNE 7 /* prune message */
45 #define DVMRP_GRAFT 8 /* graft message */
46 #define DVMRP_GRAFT_ACK 9 /* graft acknowledgement */
49 * 'flags' byte values in DVMRP_NEIGHBORS2 reply.
51 #define DVMRP_NF_TUNNEL 0x01 /* neighbors reached via tunnel */
52 #define DVMRP_NF_SRCRT 0x02 /* tunnel uses IP source routing */
53 #define DVMRP_NF_DOWN 0x10 /* kernel state of interface */
54 #define DVMRP_NF_DISABLED 0x20 /* administratively disabled */
55 #define DVMRP_NF_QUERIER 0x40 /* I am the subnet's querier */
57 static int print_probe(netdissect_options *, const u_char *, const u_char *, u_int);
58 static int print_report(netdissect_options *, const u_char *, const u_char *, u_int);
59 static int print_neighbors(netdissect_options *, const u_char *, const u_char *, u_int);
60 static int print_neighbors2(netdissect_options *, const u_char *, const u_char *, u_int);
61 static int print_prune(netdissect_options *, const u_char *);
62 static int print_graft(netdissect_options *, const u_char *);
63 static int print_graft_ack(netdissect_options *, const u_char *);
65 static uint32_t target_level;
68 dvmrp_print(netdissect_options *ndo,
69 register const u_char *bp, register u_int len)
71 register const u_char *ep;
74 ep = (const u_char *)ndo->ndo_snapend;
81 /* Skip IGMP header */
88 ND_PRINT((ndo, " Probe"));
90 if (print_probe(ndo, bp, ep, len) < 0)
96 ND_PRINT((ndo, " Report"));
97 if (ndo->ndo_vflag > 1) {
98 if (print_report(ndo, bp, ep, len) < 0)
103 case DVMRP_ASK_NEIGHBORS:
104 ND_PRINT((ndo, " Ask-neighbors(old)"));
107 case DVMRP_NEIGHBORS:
108 ND_PRINT((ndo, " Neighbors(old)"));
109 if (print_neighbors(ndo, bp, ep, len) < 0)
113 case DVMRP_ASK_NEIGHBORS2:
114 ND_PRINT((ndo, " Ask-neighbors2"));
117 case DVMRP_NEIGHBORS2:
118 ND_PRINT((ndo, " Neighbors2"));
120 * extract version and capabilities from IGMP group
124 ND_TCHECK2(bp[0], 4);
125 target_level = (bp[0] << 24) | (bp[1] << 16) |
126 (bp[2] << 8) | bp[3];
128 if (print_neighbors2(ndo, bp, ep, len) < 0)
133 ND_PRINT((ndo, " Prune"));
134 if (print_prune(ndo, bp) < 0)
139 ND_PRINT((ndo, " Graft"));
140 if (print_graft(ndo, bp) < 0)
144 case DVMRP_GRAFT_ACK:
145 ND_PRINT((ndo, " Graft-ACK"));
146 if (print_graft_ack(ndo, bp) < 0)
151 ND_PRINT((ndo, " [type %d]", type));
157 ND_PRINT((ndo, "[|dvmrp]"));
162 print_report(netdissect_options *ndo,
163 register const u_char *bp, register const u_char *ep,
166 register uint32_t mask, origin;
167 register int metric, done;
168 register u_int i, width;
172 ND_PRINT((ndo, " [|]"));
175 ND_TCHECK2(bp[0], 3);
176 mask = (uint32_t)0xff << 24 | bp[0] << 16 | bp[1] << 8 | bp[2];
185 ND_PRINT((ndo, "\n\tMask %s", intoa(htonl(mask))));
189 if (bp + width + 1 > ep) {
190 ND_PRINT((ndo, " [|]"));
193 if (len < width + 1) {
194 ND_PRINT((ndo, "\n\t [Truncated Report]"));
198 for (i = 0; i < width; ++i) {
200 origin = origin << 8 | *bp++;
207 done = metric & 0x80;
209 ND_PRINT((ndo, "\n\t %s metric %d", intoa(htonl(origin)),
220 print_probe(netdissect_options *ndo,
221 register const u_char *bp, register const u_char *ep,
224 register uint32_t genid;
226 ND_TCHECK2(bp[0], 4);
227 if ((len < 4) || ((bp + 4) > ep)) {
229 ND_PRINT((ndo, " [|}"));
232 genid = (bp[0] << 24) | (bp[1] << 16) | (bp[2] << 8) | bp[3];
235 ND_PRINT((ndo, ndo->ndo_vflag > 1 ? "\n\t" : " "));
236 ND_PRINT((ndo, "genid %u", genid));
237 if (ndo->ndo_vflag < 2)
240 while ((len > 0) && (bp < ep)) {
241 ND_TCHECK2(bp[0], 4);
242 ND_PRINT((ndo, "\n\tneighbor %s", ipaddr_string(ndo, bp)));
251 print_neighbors(netdissect_options *ndo,
252 register const u_char *bp, register const u_char *ep,
256 register u_char metric;
257 register u_char thresh;
260 while (len > 0 && bp < ep) {
261 ND_TCHECK2(bp[0], 7);
268 while (--ncount >= 0) {
269 ND_TCHECK2(bp[0], 4);
270 ND_PRINT((ndo, " [%s ->", ipaddr_string(ndo, laddr)));
271 ND_PRINT((ndo, " %s, (%d/%d)]",
272 ipaddr_string(ndo, bp), metric, thresh));
283 print_neighbors2(netdissect_options *ndo,
284 register const u_char *bp, register const u_char *ep,
288 register u_char metric, thresh, flags;
291 ND_PRINT((ndo, " (v %d.%d):",
292 (int)target_level & 0xff,
293 (int)(target_level >> 8) & 0xff));
295 while (len > 0 && bp < ep) {
296 ND_TCHECK2(bp[0], 8);
304 while (--ncount >= 0 && (len >= 4) && (bp + 4) <= ep) {
305 ND_PRINT((ndo, " [%s -> ", ipaddr_string(ndo, laddr)));
306 ND_PRINT((ndo, "%s (%d/%d", ipaddr_string(ndo, bp),
308 if (flags & DVMRP_NF_TUNNEL)
309 ND_PRINT((ndo, "/tunnel"));
310 if (flags & DVMRP_NF_SRCRT)
311 ND_PRINT((ndo, "/srcrt"));
312 if (flags & DVMRP_NF_QUERIER)
313 ND_PRINT((ndo, "/querier"));
314 if (flags & DVMRP_NF_DISABLED)
315 ND_PRINT((ndo, "/disabled"));
316 if (flags & DVMRP_NF_DOWN)
317 ND_PRINT((ndo, "/down"));
318 ND_PRINT((ndo, ")]"));
323 ND_PRINT((ndo, " [|]"));
333 print_prune(netdissect_options *ndo,
334 register const u_char *bp)
336 ND_TCHECK2(bp[0], 12);
337 ND_PRINT((ndo, " src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4)));
339 ND_PRINT((ndo, " timer "));
340 relts_print(ndo, EXTRACT_32BITS(bp));
347 print_graft(netdissect_options *ndo,
348 register const u_char *bp)
350 ND_TCHECK2(bp[0], 8);
351 ND_PRINT((ndo, " src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4)));
358 print_graft_ack(netdissect_options *ndo,
359 register const u_char *bp)
361 ND_TCHECK2(bp[0], 8);
362 ND_PRINT((ndo, " src %s grp %s", ipaddr_string(ndo, bp), ipaddr_string(ndo, bp + 4)));