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[tcpdump] / print-pim.c
1 /*
2 * Copyright (c) 1995, 1996
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: Protocol Independent Multicast (PIM) 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 #include "ip.h"
35 #include "ip6.h"
36 #include "ipproto.h"
37
38 #define PIMV1_TYPE_QUERY 0
39 #define PIMV1_TYPE_REGISTER 1
40 #define PIMV1_TYPE_REGISTER_STOP 2
41 #define PIMV1_TYPE_JOIN_PRUNE 3
42 #define PIMV1_TYPE_RP_REACHABILITY 4
43 #define PIMV1_TYPE_ASSERT 5
44 #define PIMV1_TYPE_GRAFT 6
45 #define PIMV1_TYPE_GRAFT_ACK 7
46
47 static const struct tok pimv1_type_str[] = {
48 { PIMV1_TYPE_QUERY, "Query" },
49 { PIMV1_TYPE_REGISTER, "Register" },
50 { PIMV1_TYPE_REGISTER_STOP, "Register-Stop" },
51 { PIMV1_TYPE_JOIN_PRUNE, "Join/Prune" },
52 { PIMV1_TYPE_RP_REACHABILITY, "RP-reachable" },
53 { PIMV1_TYPE_ASSERT, "Assert" },
54 { PIMV1_TYPE_GRAFT, "Graft" },
55 { PIMV1_TYPE_GRAFT_ACK, "Graft-ACK" },
56 { 0, NULL }
57 };
58
59 #define PIMV2_TYPE_HELLO 0
60 #define PIMV2_TYPE_REGISTER 1
61 #define PIMV2_TYPE_REGISTER_STOP 2
62 #define PIMV2_TYPE_JOIN_PRUNE 3
63 #define PIMV2_TYPE_BOOTSTRAP 4
64 #define PIMV2_TYPE_ASSERT 5
65 #define PIMV2_TYPE_GRAFT 6
66 #define PIMV2_TYPE_GRAFT_ACK 7
67 #define PIMV2_TYPE_CANDIDATE_RP 8
68 #define PIMV2_TYPE_PRUNE_REFRESH 9
69 #define PIMV2_TYPE_DF_ELECTION 10
70 #define PIMV2_TYPE_ECMP_REDIRECT 11
71
72 static const struct tok pimv2_type_values[] = {
73 { PIMV2_TYPE_HELLO, "Hello" },
74 { PIMV2_TYPE_REGISTER, "Register" },
75 { PIMV2_TYPE_REGISTER_STOP, "Register Stop" },
76 { PIMV2_TYPE_JOIN_PRUNE, "Join / Prune" },
77 { PIMV2_TYPE_BOOTSTRAP, "Bootstrap" },
78 { PIMV2_TYPE_ASSERT, "Assert" },
79 { PIMV2_TYPE_GRAFT, "Graft" },
80 { PIMV2_TYPE_GRAFT_ACK, "Graft Acknowledgement" },
81 { PIMV2_TYPE_CANDIDATE_RP, "Candidate RP Advertisement" },
82 { PIMV2_TYPE_PRUNE_REFRESH, "Prune Refresh" },
83 { PIMV2_TYPE_DF_ELECTION, "DF Election" },
84 { PIMV2_TYPE_ECMP_REDIRECT, "ECMP Redirect" },
85 { 0, NULL}
86 };
87
88 #define PIMV2_HELLO_OPTION_HOLDTIME 1
89 #define PIMV2_HELLO_OPTION_LANPRUNEDELAY 2
90 #define PIMV2_HELLO_OPTION_DR_PRIORITY_OLD 18
91 #define PIMV2_HELLO_OPTION_DR_PRIORITY 19
92 #define PIMV2_HELLO_OPTION_GENID 20
93 #define PIMV2_HELLO_OPTION_REFRESH_CAP 21
94 #define PIMV2_HELLO_OPTION_BIDIR_CAP 22
95 #define PIMV2_HELLO_OPTION_ADDRESS_LIST 24
96 #define PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD 65001
97
98 static const struct tok pimv2_hello_option_values[] = {
99 { PIMV2_HELLO_OPTION_HOLDTIME, "Hold Time" },
100 { PIMV2_HELLO_OPTION_LANPRUNEDELAY, "LAN Prune Delay" },
101 { PIMV2_HELLO_OPTION_DR_PRIORITY_OLD, "DR Priority (Old)" },
102 { PIMV2_HELLO_OPTION_DR_PRIORITY, "DR Priority" },
103 { PIMV2_HELLO_OPTION_GENID, "Generation ID" },
104 { PIMV2_HELLO_OPTION_REFRESH_CAP, "State Refresh Capability" },
105 { PIMV2_HELLO_OPTION_BIDIR_CAP, "Bi-Directional Capability" },
106 { PIMV2_HELLO_OPTION_ADDRESS_LIST, "Address List" },
107 { PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD, "Address List (Old)" },
108 { 0, NULL}
109 };
110
111 #define PIMV2_REGISTER_FLAG_LEN 4
112 #define PIMV2_REGISTER_FLAG_BORDER 0x80000000
113 #define PIMV2_REGISTER_FLAG_NULL 0x40000000
114
115 static const struct tok pimv2_register_flag_values[] = {
116 { PIMV2_REGISTER_FLAG_BORDER, "Border" },
117 { PIMV2_REGISTER_FLAG_NULL, "Null" },
118 { 0, NULL}
119 };
120
121 /*
122 * XXX: We consider a case where IPv6 is not ready yet for portability,
123 * but PIM dependent defintions should be independent of IPv6...
124 */
125
126 struct pim {
127 uint8_t pim_typever;
128 /* upper 4bit: PIM version number; 2 for PIMv2 */
129 /* lower 4bit: the PIM message type, currently they are:
130 * Hello, Register, Register-Stop, Join/Prune,
131 * Bootstrap, Assert, Graft (PIM-DM only),
132 * Graft-Ack (PIM-DM only), C-RP-Adv
133 */
134 #define PIM_VER(x) (((x) & 0xf0) >> 4)
135 #define PIM_TYPE(x) ((x) & 0x0f)
136 u_char pim_rsv; /* Reserved */
137 u_short pim_cksum; /* IP style check sum */
138 };
139
140 static void pimv2_print(netdissect_options *, register const u_char *bp, register u_int len, const u_char *);
141
142 static void
143 pimv1_join_prune_print(netdissect_options *ndo,
144 register const u_char *bp, register u_int len)
145 {
146 int ngroups, njoin, nprune;
147 int njp;
148
149 /* If it's a single group and a single source, use 1-line output. */
150 if (ND_TTEST2(bp[0], 30) && bp[11] == 1 &&
151 ((njoin = EXTRACT_16BITS(&bp[20])) + EXTRACT_16BITS(&bp[22])) == 1) {
152 int hold;
153
154 ND_PRINT((ndo, " RPF %s ", ipaddr_string(ndo, bp)));
155 hold = EXTRACT_16BITS(&bp[6]);
156 if (hold != 180) {
157 ND_PRINT((ndo, "Hold "));
158 unsigned_relts_print(ndo, hold);
159 }
160 ND_PRINT((ndo, "%s (%s/%d, %s", njoin ? "Join" : "Prune",
161 ipaddr_string(ndo, &bp[26]), bp[25] & 0x3f,
162 ipaddr_string(ndo, &bp[12])));
163 if (EXTRACT_32BITS(&bp[16]) != 0xffffffff)
164 ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[16])));
165 ND_PRINT((ndo, ") %s%s %s",
166 (bp[24] & 0x01) ? "Sparse" : "Dense",
167 (bp[25] & 0x80) ? " WC" : "",
168 (bp[25] & 0x40) ? "RP" : "SPT"));
169 return;
170 }
171
172 if (len < sizeof(struct in_addr))
173 goto trunc;
174 ND_TCHECK2(bp[0], sizeof(struct in_addr));
175 if (ndo->ndo_vflag > 1)
176 ND_PRINT((ndo, "\n"));
177 ND_PRINT((ndo, " Upstream Nbr: %s", ipaddr_string(ndo, bp)));
178 bp += 4;
179 len -= 4;
180 if (len < 4)
181 goto trunc;
182 ND_TCHECK2(bp[2], 2);
183 if (ndo->ndo_vflag > 1)
184 ND_PRINT((ndo, "\n"));
185 ND_PRINT((ndo, " Hold time: "));
186 unsigned_relts_print(ndo, EXTRACT_16BITS(&bp[2]));
187 if (ndo->ndo_vflag < 2)
188 return;
189 bp += 4;
190 len -= 4;
191
192 if (len < 4)
193 goto trunc;
194 ND_TCHECK2(bp[0], 4);
195 ngroups = bp[3];
196 bp += 4;
197 len -= 4;
198 while (ngroups--) {
199 /*
200 * XXX - does the address have length "addrlen" and the
201 * mask length "maddrlen"?
202 */
203 if (len < 4)
204 goto trunc;
205 ND_TCHECK2(bp[0], sizeof(struct in_addr));
206 ND_PRINT((ndo, "\n\tGroup: %s", ipaddr_string(ndo, bp)));
207 bp += 4;
208 len -= 4;
209 if (len < 4)
210 goto trunc;
211 ND_TCHECK2(bp[0], sizeof(struct in_addr));
212 if (EXTRACT_32BITS(&bp[0]) != 0xffffffff)
213 ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[0])));
214 bp += 4;
215 len -= 4;
216 if (len < 4)
217 goto trunc;
218 ND_TCHECK2(bp[0], 4);
219 njoin = EXTRACT_16BITS(&bp[0]);
220 nprune = EXTRACT_16BITS(&bp[2]);
221 ND_PRINT((ndo, " joined: %d pruned: %d", njoin, nprune));
222 bp += 4;
223 len -= 4;
224 for (njp = 0; njp < (njoin + nprune); njp++) {
225 const char *type;
226
227 if (njp < njoin)
228 type = "Join ";
229 else
230 type = "Prune";
231 if (len < 6)
232 goto trunc;
233 ND_TCHECK2(bp[0], 6);
234 ND_PRINT((ndo, "\n\t%s %s%s%s%s/%d", type,
235 (bp[0] & 0x01) ? "Sparse " : "Dense ",
236 (bp[1] & 0x80) ? "WC " : "",
237 (bp[1] & 0x40) ? "RP " : "SPT ",
238 ipaddr_string(ndo, &bp[2]),
239 bp[1] & 0x3f));
240 bp += 6;
241 len -= 6;
242 }
243 }
244 return;
245 trunc:
246 ND_PRINT((ndo, "[|pim]"));
247 return;
248 }
249
250 void
251 pimv1_print(netdissect_options *ndo,
252 register const u_char *bp, register u_int len)
253 {
254 register u_char type;
255
256 ND_TCHECK(bp[1]);
257 type = bp[1];
258
259 ND_PRINT((ndo, " %s", tok2str(pimv1_type_str, "[type %u]", type)));
260 switch (type) {
261 case PIMV1_TYPE_QUERY:
262 if (ND_TTEST(bp[8])) {
263 switch (bp[8] >> 4) {
264 case 0:
265 ND_PRINT((ndo, " Dense-mode"));
266 break;
267 case 1:
268 ND_PRINT((ndo, " Sparse-mode"));
269 break;
270 case 2:
271 ND_PRINT((ndo, " Sparse-Dense-mode"));
272 break;
273 default:
274 ND_PRINT((ndo, " mode-%d", bp[8] >> 4));
275 break;
276 }
277 }
278 if (ndo->ndo_vflag) {
279 ND_TCHECK2(bp[10],2);
280 ND_PRINT((ndo, " (Hold-time "));
281 unsigned_relts_print(ndo, EXTRACT_16BITS(&bp[10]));
282 ND_PRINT((ndo, ")"));
283 }
284 break;
285
286 case PIMV1_TYPE_REGISTER:
287 ND_TCHECK2(bp[8], 20); /* ip header */
288 ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[20]),
289 ipaddr_string(ndo, &bp[24])));
290 break;
291 case PIMV1_TYPE_REGISTER_STOP:
292 ND_TCHECK2(bp[12], sizeof(struct in_addr));
293 ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[8]),
294 ipaddr_string(ndo, &bp[12])));
295 break;
296 case PIMV1_TYPE_RP_REACHABILITY:
297 if (ndo->ndo_vflag) {
298 ND_TCHECK2(bp[22], 2);
299 ND_PRINT((ndo, " group %s", ipaddr_string(ndo, &bp[8])));
300 if (EXTRACT_32BITS(&bp[12]) != 0xffffffff)
301 ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[12])));
302 ND_PRINT((ndo, " RP %s hold ", ipaddr_string(ndo, &bp[16])));
303 unsigned_relts_print(ndo, EXTRACT_16BITS(&bp[22]));
304 }
305 break;
306 case PIMV1_TYPE_ASSERT:
307 ND_TCHECK2(bp[16], sizeof(struct in_addr));
308 ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[16]),
309 ipaddr_string(ndo, &bp[8])));
310 if (EXTRACT_32BITS(&bp[12]) != 0xffffffff)
311 ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[12])));
312 ND_TCHECK2(bp[24], 4);
313 ND_PRINT((ndo, " %s pref %d metric %d",
314 (bp[20] & 0x80) ? "RP-tree" : "SPT",
315 EXTRACT_32BITS(&bp[20]) & 0x7fffffff,
316 EXTRACT_32BITS(&bp[24])));
317 break;
318 case PIMV1_TYPE_JOIN_PRUNE:
319 case PIMV1_TYPE_GRAFT:
320 case PIMV1_TYPE_GRAFT_ACK:
321 if (ndo->ndo_vflag) {
322 if (len < 8)
323 goto trunc;
324 pimv1_join_prune_print(ndo, &bp[8], len - 8);
325 }
326 break;
327 }
328 ND_TCHECK(bp[4]);
329 if ((bp[4] >> 4) != 1)
330 ND_PRINT((ndo, " [v%d]", bp[4] >> 4));
331 return;
332
333 trunc:
334 ND_PRINT((ndo, "[|pim]"));
335 return;
336 }
337
338 /*
339 * auto-RP is a cisco protocol, documented at
340 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
341 *
342 * This implements version 1+, dated Sept 9, 1998.
343 */
344 void
345 cisco_autorp_print(netdissect_options *ndo,
346 register const u_char *bp, register u_int len)
347 {
348 int type;
349 int numrps;
350 int hold;
351
352 if (len < 8)
353 goto trunc;
354 ND_TCHECK(bp[0]);
355 ND_PRINT((ndo, " auto-rp "));
356 type = bp[0];
357 switch (type) {
358 case 0x11:
359 ND_PRINT((ndo, "candidate-advert"));
360 break;
361 case 0x12:
362 ND_PRINT((ndo, "mapping"));
363 break;
364 default:
365 ND_PRINT((ndo, "type-0x%02x", type));
366 break;
367 }
368
369 ND_TCHECK(bp[1]);
370 numrps = bp[1];
371
372 ND_TCHECK2(bp[2], 2);
373 ND_PRINT((ndo, " Hold "));
374 hold = EXTRACT_16BITS(&bp[2]);
375 if (hold)
376 unsigned_relts_print(ndo, EXTRACT_16BITS(&bp[2]));
377 else
378 ND_PRINT((ndo, "FOREVER"));
379
380 /* Next 4 bytes are reserved. */
381
382 bp += 8; len -= 8;
383
384 /*XXX skip unless -v? */
385
386 /*
387 * Rest of packet:
388 * numrps entries of the form:
389 * 32 bits: RP
390 * 6 bits: reserved
391 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
392 * 8 bits: # of entries for this RP
393 * each entry: 7 bits: reserved, 1 bit: negative,
394 * 8 bits: mask 32 bits: source
395 * lather, rinse, repeat.
396 */
397 while (numrps--) {
398 int nentries;
399 char s;
400
401 if (len < 4)
402 goto trunc;
403 ND_TCHECK2(bp[0], 4);
404 ND_PRINT((ndo, " RP %s", ipaddr_string(ndo, bp)));
405 bp += 4;
406 len -= 4;
407 if (len < 1)
408 goto trunc;
409 ND_TCHECK(bp[0]);
410 switch (bp[0] & 0x3) {
411 case 0: ND_PRINT((ndo, " PIMv?"));
412 break;
413 case 1: ND_PRINT((ndo, " PIMv1"));
414 break;
415 case 2: ND_PRINT((ndo, " PIMv2"));
416 break;
417 case 3: ND_PRINT((ndo, " PIMv1+2"));
418 break;
419 }
420 if (bp[0] & 0xfc)
421 ND_PRINT((ndo, " [rsvd=0x%02x]", bp[0] & 0xfc));
422 bp += 1;
423 len -= 1;
424 if (len < 1)
425 goto trunc;
426 ND_TCHECK(bp[0]);
427 nentries = bp[0];
428 bp += 1;
429 len -= 1;
430 s = ' ';
431 for (; nentries; nentries--) {
432 if (len < 6)
433 goto trunc;
434 ND_TCHECK2(bp[0], 6);
435 ND_PRINT((ndo, "%c%s%s/%d", s, bp[0] & 1 ? "!" : "",
436 ipaddr_string(ndo, &bp[2]), bp[1]));
437 if (bp[0] & 0x02) {
438 ND_PRINT((ndo, " bidir"));
439 }
440 if (bp[0] & 0xfc) {
441 ND_PRINT((ndo, "[rsvd=0x%02x]", bp[0] & 0xfc));
442 }
443 s = ',';
444 bp += 6; len -= 6;
445 }
446 }
447 return;
448
449 trunc:
450 ND_PRINT((ndo, "[|autorp]"));
451 return;
452 }
453
454 void
455 pim_print(netdissect_options *ndo,
456 register const u_char *bp, register u_int len, const u_char *bp2)
457 {
458 register const struct pim *pim = (const struct pim *)bp;
459
460 #ifdef notyet /* currently we see only version and type */
461 ND_TCHECK(pim->pim_rsv);
462 #endif
463
464 ND_TCHECK(pim->pim_typever);
465 switch (PIM_VER(pim->pim_typever)) {
466 case 2:
467 if (!ndo->ndo_vflag) {
468 ND_PRINT((ndo, "PIMv%u, %s, length %u",
469 PIM_VER(pim->pim_typever),
470 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim->pim_typever)),
471 len));
472 return;
473 } else {
474 ND_PRINT((ndo, "PIMv%u, length %u\n\t%s",
475 PIM_VER(pim->pim_typever),
476 len,
477 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim->pim_typever))));
478 pimv2_print(ndo, bp, len, bp2);
479 }
480 break;
481 default:
482 ND_PRINT((ndo, "PIMv%u, length %u",
483 PIM_VER(pim->pim_typever),
484 len));
485 break;
486 }
487 return;
488
489 trunc:
490 ND_PRINT((ndo, "[|pim]"));
491 return;
492 }
493
494 /*
495 * PIMv2 uses encoded address representations.
496 *
497 * The last PIM-SM I-D before RFC2117 was published specified the
498 * following representation for unicast addresses. However, RFC2117
499 * specified no encoding for unicast addresses with the unicast
500 * address length specified in the header. Therefore, we have to
501 * guess which encoding is being used (Cisco's PIMv2 implementation
502 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
503 * field into a 'unicast-address-length-in-bytes' field. We guess
504 * that it's the draft encoding if this reserved field is zero.
505 *
506 * RFC2362 goes back to the encoded format, and calls the addr length
507 * field "reserved" again.
508 *
509 * The first byte is the address family, from:
510 *
511 * 0 Reserved
512 * 1 IP (IP version 4)
513 * 2 IP6 (IP version 6)
514 * 3 NSAP
515 * 4 HDLC (8-bit multidrop)
516 * 5 BBN 1822
517 * 6 802 (includes all 802 media plus Ethernet "canonical format")
518 * 7 E.163
519 * 8 E.164 (SMDS, Frame Relay, ATM)
520 * 9 F.69 (Telex)
521 * 10 X.121 (X.25, Frame Relay)
522 * 11 IPX
523 * 12 Appletalk
524 * 13 Decnet IV
525 * 14 Banyan Vines
526 * 15 E.164 with NSAP format subaddress
527 *
528 * In addition, the second byte is an "Encoding". 0 is the default
529 * encoding for the address family, and no other encodings are currently
530 * specified.
531 *
532 */
533
534 enum pimv2_addrtype {
535 pimv2_unicast, pimv2_group, pimv2_source
536 };
537
538 /* 0 1 2 3
539 * 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
540 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
541 * | Addr Family | Encoding Type | Unicast Address |
542 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
543 * 0 1 2 3
544 * 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
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
546 * | Addr Family | Encoding Type | Reserved | Mask Len |
547 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
548 * | Group multicast Address |
549 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
550 * 0 1 2 3
551 * 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
552 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
553 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
554 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
555 * | Source Address |
556 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
557 */
558 static int
559 pimv2_addr_print(netdissect_options *ndo,
560 const u_char *bp, u_int len, enum pimv2_addrtype at,
561 u_int addr_len, int silent)
562 {
563 int af;
564 int hdrlen;
565
566 if (addr_len == 0) {
567 if (len < 2)
568 goto trunc;
569 ND_TCHECK(bp[1]);
570 switch (bp[0]) {
571 case 1:
572 af = AF_INET;
573 addr_len = (u_int)sizeof(struct in_addr);
574 break;
575 case 2:
576 af = AF_INET6;
577 addr_len = (u_int)sizeof(struct in6_addr);
578 break;
579 default:
580 return -1;
581 }
582 if (bp[1] != 0)
583 return -1;
584 hdrlen = 2;
585 } else {
586 switch (addr_len) {
587 case sizeof(struct in_addr):
588 af = AF_INET;
589 break;
590 case sizeof(struct in6_addr):
591 af = AF_INET6;
592 break;
593 default:
594 return -1;
595 break;
596 }
597 hdrlen = 0;
598 }
599
600 bp += hdrlen;
601 len -= hdrlen;
602 switch (at) {
603 case pimv2_unicast:
604 if (len < addr_len)
605 goto trunc;
606 ND_TCHECK2(bp[0], addr_len);
607 if (af == AF_INET) {
608 if (!silent)
609 ND_PRINT((ndo, "%s", ipaddr_string(ndo, bp)));
610 }
611 else if (af == AF_INET6) {
612 if (!silent)
613 ND_PRINT((ndo, "%s", ip6addr_string(ndo, bp)));
614 }
615 return hdrlen + addr_len;
616 case pimv2_group:
617 case pimv2_source:
618 if (len < addr_len + 2)
619 goto trunc;
620 ND_TCHECK2(bp[0], addr_len + 2);
621 if (af == AF_INET) {
622 if (!silent) {
623 ND_PRINT((ndo, "%s", ipaddr_string(ndo, bp + 2)));
624 if (bp[1] != 32)
625 ND_PRINT((ndo, "/%u", bp[1]));
626 }
627 }
628 else if (af == AF_INET6) {
629 if (!silent) {
630 ND_PRINT((ndo, "%s", ip6addr_string(ndo, bp + 2)));
631 if (bp[1] != 128)
632 ND_PRINT((ndo, "/%u", bp[1]));
633 }
634 }
635 if (bp[0] && !silent) {
636 if (at == pimv2_group) {
637 ND_PRINT((ndo, "(0x%02x)", bp[0]));
638 } else {
639 ND_PRINT((ndo, "(%s%s%s",
640 bp[0] & 0x04 ? "S" : "",
641 bp[0] & 0x02 ? "W" : "",
642 bp[0] & 0x01 ? "R" : ""));
643 if (bp[0] & 0xf8) {
644 ND_PRINT((ndo, "+0x%02x", bp[0] & 0xf8));
645 }
646 ND_PRINT((ndo, ")"));
647 }
648 }
649 return hdrlen + 2 + addr_len;
650 default:
651 return -1;
652 }
653 trunc:
654 return -1;
655 }
656
657 enum checksum_status {
658 CORRECT,
659 INCORRECT,
660 UNVERIFIED
661 };
662
663 static enum checksum_status
664 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
665 const u_char *bp2, u_int len)
666 {
667 const struct ip *ip;
668 u_int cksum;
669
670 if (!ND_TTEST2(bp[0], len)) {
671 /* We don't have all the data. */
672 return (UNVERIFIED);
673 }
674 ip = (const struct ip *)bp2;
675 if (IP_V(ip) == 4) {
676 struct cksum_vec vec[1];
677
678 vec[0].ptr = bp;
679 vec[0].len = len;
680 cksum = in_cksum(vec, 1);
681 return (cksum ? INCORRECT : CORRECT);
682 } else if (IP_V(ip) == 6) {
683 const struct ip6_hdr *ip6;
684
685 ip6 = (const struct ip6_hdr *)bp2;
686 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
687 return (cksum ? INCORRECT : CORRECT);
688 } else {
689 return (UNVERIFIED);
690 }
691 }
692
693 static void
694 pimv2_print(netdissect_options *ndo,
695 register const u_char *bp, register u_int len, const u_char *bp2)
696 {
697 register const u_char *ep;
698 register const struct pim *pim = (const struct pim *)bp;
699 int advance;
700 enum checksum_status cksum_status;
701 int pimv2_addr_len;
702
703 ep = (const u_char *)ndo->ndo_snapend;
704 if (bp >= ep)
705 return;
706 if (ep > bp + len)
707 ep = bp + len;
708 if (len < 2)
709 goto trunc;
710 ND_TCHECK(pim->pim_rsv);
711 pimv2_addr_len = pim->pim_rsv;
712 if (pimv2_addr_len != 0)
713 ND_PRINT((ndo, ", RFC2117-encoding"));
714
715 if (len < 4)
716 goto trunc;
717 ND_TCHECK(pim->pim_cksum);
718 ND_PRINT((ndo, ", cksum 0x%04x ", EXTRACT_16BITS(&pim->pim_cksum)));
719 if (EXTRACT_16BITS(&pim->pim_cksum) == 0) {
720 ND_PRINT((ndo, "(unverified)"));
721 } else {
722 if (PIM_TYPE(pim->pim_typever) == PIMV2_TYPE_REGISTER) {
723 /*
724 * The checksum only covers the packet header,
725 * not the encapsulated packet.
726 */
727 cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
728 if (cksum_status == INCORRECT) {
729 /*
730 * To quote RFC 4601, "For interoperability
731 * reasons, a message carrying a checksum
732 * calculated over the entire PIM Register
733 * message should also be accepted."
734 */
735 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
736 }
737 } else {
738 /*
739 * The checksum covers the entire packet.
740 */
741 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
742 }
743 switch (cksum_status) {
744
745 case CORRECT:
746 ND_PRINT((ndo, "(correct)"));
747 break;
748
749 case INCORRECT:
750 ND_PRINT((ndo, "(incorrect)"));
751 break;
752
753 case UNVERIFIED:
754 ND_PRINT((ndo, "(unverified)"));
755 break;
756 }
757 }
758 bp += 4;
759 len -= 4;
760
761 switch (PIM_TYPE(pim->pim_typever)) {
762 case PIMV2_TYPE_HELLO:
763 {
764 uint16_t otype, olen;
765 while (len > 0) {
766 if (len < 4)
767 goto trunc;
768 ND_TCHECK2(bp[0], 4);
769 otype = EXTRACT_16BITS(&bp[0]);
770 olen = EXTRACT_16BITS(&bp[2]);
771 ND_PRINT((ndo, "\n\t %s Option (%u), length %u, Value: ",
772 tok2str(pimv2_hello_option_values, "Unknown", otype),
773 otype,
774 olen));
775 bp += 4;
776 len -= 4;
777
778 if (len < olen)
779 goto trunc;
780 ND_TCHECK2(bp[0], olen);
781 switch (otype) {
782 case PIMV2_HELLO_OPTION_HOLDTIME:
783 if (olen != 2) {
784 ND_PRINT((ndo, "ERROR: Option Length != 2 Bytes (%u)", olen));
785 } else {
786 unsigned_relts_print(ndo, EXTRACT_16BITS(bp));
787 }
788 break;
789
790 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
791 if (olen != 4) {
792 ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
793 } else {
794 char t_bit;
795 uint16_t lan_delay, override_interval;
796 lan_delay = EXTRACT_16BITS(bp);
797 override_interval = EXTRACT_16BITS(bp+2);
798 t_bit = (lan_delay & 0x8000)? 1 : 0;
799 lan_delay &= ~0x8000;
800 ND_PRINT((ndo, "\n\t T-bit=%d, LAN delay %dms, Override interval %dms",
801 t_bit, lan_delay, override_interval));
802 }
803 break;
804
805 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
806 case PIMV2_HELLO_OPTION_DR_PRIORITY:
807 switch (olen) {
808 case 0:
809 ND_PRINT((ndo, "Bi-Directional Capability (Old)"));
810 break;
811 case 4:
812 ND_PRINT((ndo, "%u", EXTRACT_32BITS(bp)));
813 break;
814 default:
815 ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
816 break;
817 }
818 break;
819
820 case PIMV2_HELLO_OPTION_GENID:
821 if (olen != 4) {
822 ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
823 } else {
824 ND_PRINT((ndo, "0x%08x", EXTRACT_32BITS(bp)));
825 }
826 break;
827
828 case PIMV2_HELLO_OPTION_REFRESH_CAP:
829 if (olen != 4) {
830 ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
831 } else {
832 ND_PRINT((ndo, "v%d", *bp));
833 if (*(bp+1) != 0) {
834 ND_PRINT((ndo, ", interval "));
835 unsigned_relts_print(ndo, *(bp+1));
836 }
837 if (EXTRACT_16BITS(bp+2) != 0) {
838 ND_PRINT((ndo, " ?0x%04x?", EXTRACT_16BITS(bp+2)));
839 }
840 }
841 break;
842
843 case PIMV2_HELLO_OPTION_BIDIR_CAP:
844 break;
845
846 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
847 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
848 if (ndo->ndo_vflag > 1) {
849 const u_char *ptr = bp;
850 u_int plen = len;
851 while (ptr < (bp+olen)) {
852 ND_PRINT((ndo, "\n\t "));
853 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
854 if (advance < 0)
855 goto trunc;
856 ptr += advance;
857 plen -= advance;
858 }
859 }
860 break;
861 default:
862 if (ndo->ndo_vflag <= 1)
863 print_unknown_data(ndo, bp, "\n\t ", olen);
864 break;
865 }
866 /* do we want to see an additionally hexdump ? */
867 if (ndo->ndo_vflag> 1)
868 print_unknown_data(ndo, bp, "\n\t ", olen);
869 bp += olen;
870 len -= olen;
871 }
872 break;
873 }
874
875 case PIMV2_TYPE_REGISTER:
876 {
877 const struct ip *ip;
878
879 if (len < 4)
880 goto trunc;
881 ND_TCHECK2(*bp, PIMV2_REGISTER_FLAG_LEN);
882
883 ND_PRINT((ndo, ", Flags [ %s ]\n\t",
884 tok2str(pimv2_register_flag_values,
885 "none",
886 EXTRACT_32BITS(bp))));
887
888 bp += 4; len -= 4;
889 /* encapsulated multicast packet */
890 if (len == 0)
891 goto trunc;
892 ip = (const struct ip *)bp;
893 ND_TCHECK(ip->ip_vhl);
894 switch (IP_V(ip)) {
895 case 0: /* Null header */
896 ND_TCHECK(ip->ip_dst);
897 ND_PRINT((ndo, "IP-Null-header %s > %s",
898 ipaddr_string(ndo, &ip->ip_src),
899 ipaddr_string(ndo, &ip->ip_dst)));
900 break;
901
902 case 4: /* IPv4 */
903 ip_print(ndo, bp, len);
904 break;
905
906 case 6: /* IPv6 */
907 ip6_print(ndo, bp, len);
908 break;
909
910 default:
911 ND_PRINT((ndo, "IP ver %d", IP_V(ip)));
912 break;
913 }
914 break;
915 }
916
917 case PIMV2_TYPE_REGISTER_STOP:
918 ND_PRINT((ndo, " group="));
919 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
920 goto trunc;
921 bp += advance; len -= advance;
922 ND_PRINT((ndo, " source="));
923 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
924 goto trunc;
925 bp += advance; len -= advance;
926 break;
927
928 case PIMV2_TYPE_JOIN_PRUNE:
929 case PIMV2_TYPE_GRAFT:
930 case PIMV2_TYPE_GRAFT_ACK:
931
932
933 /*
934 * 0 1 2 3
935 * 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
936 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
937 * |PIM Ver| Type | Addr length | Checksum |
938 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
939 * | Unicast-Upstream Neighbor Address |
940 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
941 * | Reserved | Num groups | Holdtime |
942 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
943 * | Encoded-Multicast Group Address-1 |
944 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
945 * | Number of Joined Sources | Number of Pruned Sources |
946 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
947 * | Encoded-Joined Source Address-1 |
948 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
949 * | . |
950 * | . |
951 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
952 * | Encoded-Joined Source Address-n |
953 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
954 * | Encoded-Pruned Source Address-1 |
955 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
956 * | . |
957 * | . |
958 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
959 * | Encoded-Pruned Source Address-n |
960 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
961 * | . |
962 * | . |
963 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
964 * | Encoded-Multicast Group Address-n |
965 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
966 */
967
968 {
969 uint8_t ngroup;
970 uint16_t holdtime;
971 uint16_t njoin;
972 uint16_t nprune;
973 int i, j;
974
975 if (PIM_TYPE(pim->pim_typever) != 7) { /*not for Graft-ACK*/
976 ND_PRINT((ndo, ", upstream-neighbor: "));
977 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
978 goto trunc;
979 bp += advance; len -= advance;
980 }
981 if (len < 4)
982 goto trunc;
983 ND_TCHECK2(*bp, 4);
984 ngroup = bp[1];
985 holdtime = EXTRACT_16BITS(&bp[2]);
986 ND_PRINT((ndo, "\n\t %u group(s)", ngroup));
987 if (PIM_TYPE(pim->pim_typever) != 7) { /*not for Graft-ACK*/
988 ND_PRINT((ndo, ", holdtime: "));
989 if (holdtime == 0xffff)
990 ND_PRINT((ndo, "infinite"));
991 else
992 unsigned_relts_print(ndo, holdtime);
993 }
994 bp += 4; len -= 4;
995 for (i = 0; i < ngroup; i++) {
996 ND_PRINT((ndo, "\n\t group #%u: ", i+1));
997 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
998 goto trunc;
999 bp += advance; len -= advance;
1000 if (len < 4)
1001 goto trunc;
1002 ND_TCHECK2(*bp, 4);
1003 njoin = EXTRACT_16BITS(&bp[0]);
1004 nprune = EXTRACT_16BITS(&bp[2]);
1005 ND_PRINT((ndo, ", joined sources: %u, pruned sources: %u", njoin, nprune));
1006 bp += 4; len -= 4;
1007 for (j = 0; j < njoin; j++) {
1008 ND_PRINT((ndo, "\n\t joined source #%u: ", j+1));
1009 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1010 goto trunc;
1011 bp += advance; len -= advance;
1012 }
1013 for (j = 0; j < nprune; j++) {
1014 ND_PRINT((ndo, "\n\t pruned source #%u: ", j+1));
1015 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1016 goto trunc;
1017 bp += advance; len -= advance;
1018 }
1019 }
1020 break;
1021 }
1022
1023 case PIMV2_TYPE_BOOTSTRAP:
1024 {
1025 int i, j, frpcnt;
1026
1027 /* Fragment Tag, Hash Mask len, and BSR-priority */
1028 if (len < 2)
1029 goto trunc;
1030 ND_TCHECK_16BITS(bp);
1031 ND_PRINT((ndo, " tag=%x", EXTRACT_16BITS(bp)));
1032 bp += 2;
1033 len -= 2;
1034 if (len < 1)
1035 goto trunc;
1036 ND_TCHECK(bp[0]);
1037 ND_PRINT((ndo, " hashmlen=%d", bp[0]));
1038 if (len < 2)
1039 goto trunc;
1040 ND_TCHECK(bp[2]);
1041 ND_PRINT((ndo, " BSRprio=%d", bp[1]));
1042 bp += 2;
1043 len -= 2;
1044
1045 /* Encoded-Unicast-BSR-Address */
1046 ND_PRINT((ndo, " BSR="));
1047 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1048 goto trunc;
1049 bp += advance;
1050 len -= advance;
1051
1052 for (i = 0; bp < ep; i++) {
1053 /* Encoded-Group Address */
1054 ND_PRINT((ndo, " (group%d: ", i));
1055 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1056 goto trunc;
1057 bp += advance;
1058 len -= advance;
1059
1060 /* RP-Count, Frag RP-Cnt, and rsvd */
1061 if (len < 1)
1062 goto trunc;
1063 ND_TCHECK(bp[0]);
1064 ND_PRINT((ndo, " RPcnt=%d", bp[0]));
1065 if (len < 2)
1066 goto trunc;
1067 ND_TCHECK(bp[1]);
1068 ND_PRINT((ndo, " FRPcnt=%d", frpcnt = bp[1]));
1069 if (len < 4)
1070 goto trunc;
1071 bp += 4;
1072 len -= 4;
1073
1074 for (j = 0; j < frpcnt && bp < ep; j++) {
1075 /* each RP info */
1076 ND_PRINT((ndo, " RP%d=", j));
1077 if ((advance = pimv2_addr_print(ndo, bp, len,
1078 pimv2_unicast,
1079 pimv2_addr_len,
1080 0)) < 0)
1081 goto trunc;
1082 bp += advance;
1083 len -= advance;
1084
1085 if (len < 2)
1086 goto trunc;
1087 ND_TCHECK_16BITS(bp);
1088 ND_PRINT((ndo, ",holdtime="));
1089 unsigned_relts_print(ndo, EXTRACT_16BITS(bp));
1090 if (len < 3)
1091 goto trunc;
1092 ND_TCHECK(bp[2]);
1093 ND_PRINT((ndo, ",prio=%d", bp[2]));
1094 if (len < 4)
1095 goto trunc;
1096 bp += 4;
1097 len -= 4;
1098 }
1099 ND_PRINT((ndo, ")"));
1100 }
1101 break;
1102 }
1103 case PIMV2_TYPE_ASSERT:
1104 ND_PRINT((ndo, " group="));
1105 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1106 goto trunc;
1107 bp += advance; len -= advance;
1108 ND_PRINT((ndo, " src="));
1109 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1110 goto trunc;
1111 bp += advance; len -= advance;
1112 if (len < 8)
1113 goto trunc;
1114 ND_TCHECK2(*bp, 8);
1115 if (bp[0] & 0x80)
1116 ND_PRINT((ndo, " RPT"));
1117 ND_PRINT((ndo, " pref=%u", EXTRACT_32BITS(&bp[0]) & 0x7fffffff));
1118 ND_PRINT((ndo, " metric=%u", EXTRACT_32BITS(&bp[4])));
1119 break;
1120
1121 case PIMV2_TYPE_CANDIDATE_RP:
1122 {
1123 int i, pfxcnt;
1124
1125 /* Prefix-Cnt, Priority, and Holdtime */
1126 if (len < 1)
1127 goto trunc;
1128 ND_TCHECK(bp[0]);
1129 ND_PRINT((ndo, " prefix-cnt=%d", bp[0]));
1130 pfxcnt = bp[0];
1131 if (len < 2)
1132 goto trunc;
1133 ND_TCHECK(bp[1]);
1134 ND_PRINT((ndo, " prio=%d", bp[1]));
1135 if (len < 4)
1136 goto trunc;
1137 ND_TCHECK_16BITS(&bp[2]);
1138 ND_PRINT((ndo, " holdtime="));
1139 unsigned_relts_print(ndo, EXTRACT_16BITS(&bp[2]));
1140 bp += 4;
1141 len -= 4;
1142
1143 /* Encoded-Unicast-RP-Address */
1144 ND_PRINT((ndo, " RP="));
1145 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1146 goto trunc;
1147 bp += advance;
1148 len -= advance;
1149
1150 /* Encoded-Group Addresses */
1151 for (i = 0; i < pfxcnt && bp < ep; i++) {
1152 ND_PRINT((ndo, " Group%d=", i));
1153 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1154 goto trunc;
1155 bp += advance;
1156 len -= advance;
1157 }
1158 break;
1159 }
1160
1161 case PIMV2_TYPE_PRUNE_REFRESH:
1162 ND_PRINT((ndo, " src="));
1163 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1164 goto trunc;
1165 bp += advance;
1166 len -= advance;
1167 ND_PRINT((ndo, " grp="));
1168 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1169 goto trunc;
1170 bp += advance;
1171 len -= advance;
1172 ND_PRINT((ndo, " forwarder="));
1173 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1174 goto trunc;
1175 bp += advance;
1176 len -= advance;
1177 if (len < 2)
1178 goto trunc;
1179 ND_TCHECK_16BITS(bp);
1180 ND_PRINT((ndo, " TUNR "));
1181 unsigned_relts_print(ndo, EXTRACT_16BITS(bp));
1182 break;
1183
1184
1185 default:
1186 ND_PRINT((ndo, " [type %d]", PIM_TYPE(pim->pim_typever)));
1187 break;
1188 }
1189
1190 return;
1191
1192 trunc:
1193 ND_PRINT((ndo, "[|pim]"));
1194 }
1195
1196 /*
1197 * Local Variables:
1198 * c-style: whitesmith
1199 * c-basic-offset: 8
1200 * End:
1201 */
[mirror] the TCPdump network dissector