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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 nd_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 nd_uint8_t pim_rsv; /* Reserved in v1, address length in v2 */
137 nd_uint16_t pim_cksum; /* IP style check sum */
138 };
139
140 static void pimv2_print(netdissect_options *, const u_char *bp, u_int len, const u_char *);
141
142 static void
143 pimv1_join_prune_print(netdissect_options *ndo,
144 const u_char *bp, u_int len)
145 {
146 u_int ngroups, njoin, nprune;
147 u_int njp;
148
149 /* If it's a single group and a single source, use 1-line output. */
150 if (ND_TTEST_LEN(bp, 30) && EXTRACT_U_1(bp + 11) == 1 &&
151 ((njoin = EXTRACT_BE_U_2(bp + 20)) + EXTRACT_BE_U_2(bp + 22)) == 1) {
152 u_int hold;
153
154 ND_PRINT(" RPF %s ", ipaddr_string(ndo, bp));
155 hold = EXTRACT_BE_U_2(bp + 6);
156 if (hold != 180) {
157 ND_PRINT("Hold ");
158 unsigned_relts_print(ndo, hold);
159 }
160 ND_PRINT("%s (%s/%u, %s", njoin ? "Join" : "Prune",
161 ipaddr_string(ndo, bp + 26), EXTRACT_U_1(bp + 25) & 0x3f,
162 ipaddr_string(ndo, bp + 12));
163 if (EXTRACT_BE_U_4(bp + 16) != 0xffffffff)
164 ND_PRINT("/%s", ipaddr_string(ndo, bp + 16));
165 ND_PRINT(") %s%s %s",
166 (EXTRACT_U_1(bp + 24) & 0x01) ? "Sparse" : "Dense",
167 (EXTRACT_U_1(bp + 25) & 0x80) ? " WC" : "",
168 (EXTRACT_U_1(bp + 25) & 0x40) ? "RP" : "SPT");
169 return;
170 }
171
172 if (len < sizeof(struct in_addr))
173 goto trunc;
174 ND_TCHECK_LEN(bp, sizeof(struct in_addr));
175 if (ndo->ndo_vflag > 1)
176 ND_PRINT("\n");
177 ND_PRINT(" Upstream Nbr: %s", ipaddr_string(ndo, bp));
178 bp += 4;
179 len -= 4;
180 if (len < 4)
181 goto trunc;
182 ND_TCHECK_2(bp + 2);
183 if (ndo->ndo_vflag > 1)
184 ND_PRINT("\n");
185 ND_PRINT(" Hold time: ");
186 unsigned_relts_print(ndo, EXTRACT_BE_U_2(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_TCHECK_4(bp);
195 ngroups = EXTRACT_U_1(bp + 3);
196 bp += 4;
197 len -= 4;
198 while (ngroups != 0) {
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_TCHECK_LEN(bp, sizeof(struct in_addr));
206 ND_PRINT("\n\tGroup: %s", ipaddr_string(ndo, bp));
207 bp += 4;
208 len -= 4;
209 if (len < 4)
210 goto trunc;
211 ND_TCHECK_LEN(bp, sizeof(struct in_addr));
212 if (EXTRACT_BE_U_4(bp) != 0xffffffff)
213 ND_PRINT("/%s", ipaddr_string(ndo, bp));
214 bp += 4;
215 len -= 4;
216 if (len < 4)
217 goto trunc;
218 ND_TCHECK_4(bp);
219 njoin = EXTRACT_BE_U_2(bp);
220 nprune = EXTRACT_BE_U_2(bp + 2);
221 ND_PRINT(" joined: %u pruned: %u", 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_TCHECK_6(bp);
234 ND_PRINT("\n\t%s %s%s%s%s/%u", type,
235 (EXTRACT_U_1(bp) & 0x01) ? "Sparse " : "Dense ",
236 (EXTRACT_U_1(bp + 1) & 0x80) ? "WC " : "",
237 (EXTRACT_U_1(bp + 1) & 0x40) ? "RP " : "SPT ",
238 ipaddr_string(ndo, bp + 2),
239 EXTRACT_U_1(bp + 1) & 0x3f);
240 bp += 6;
241 len -= 6;
242 }
243 ngroups--;
244 }
245 return;
246 trunc:
247 ND_PRINT("[|pim]");
248 return;
249 }
250
251 void
252 pimv1_print(netdissect_options *ndo,
253 const u_char *bp, u_int len)
254 {
255 u_char type;
256
257 ND_TCHECK_1(bp + 1);
258 type = EXTRACT_U_1(bp + 1);
259
260 ND_PRINT(" %s", tok2str(pimv1_type_str, "[type %u]", type));
261 switch (type) {
262 case PIMV1_TYPE_QUERY:
263 if (ND_TTEST_1(bp + 8)) {
264 switch (EXTRACT_U_1(bp + 8) >> 4) {
265 case 0:
266 ND_PRINT(" Dense-mode");
267 break;
268 case 1:
269 ND_PRINT(" Sparse-mode");
270 break;
271 case 2:
272 ND_PRINT(" Sparse-Dense-mode");
273 break;
274 default:
275 ND_PRINT(" mode-%u", EXTRACT_U_1(bp + 8) >> 4);
276 break;
277 }
278 }
279 if (ndo->ndo_vflag) {
280 ND_TCHECK_2(bp + 10);
281 ND_PRINT(" (Hold-time ");
282 unsigned_relts_print(ndo, EXTRACT_BE_U_2(bp + 10));
283 ND_PRINT(")");
284 }
285 break;
286
287 case PIMV1_TYPE_REGISTER:
288 ND_TCHECK_LEN(bp + 8, 20); /* ip header */
289 ND_PRINT(" for %s > %s", ipaddr_string(ndo, bp + 20),
290 ipaddr_string(ndo, bp + 24));
291 break;
292 case PIMV1_TYPE_REGISTER_STOP:
293 ND_TCHECK_LEN(bp + 12, sizeof(struct in_addr));
294 ND_PRINT(" for %s > %s", ipaddr_string(ndo, bp + 8),
295 ipaddr_string(ndo, bp + 12));
296 break;
297 case PIMV1_TYPE_RP_REACHABILITY:
298 if (ndo->ndo_vflag) {
299 ND_TCHECK_2(bp + 22);
300 ND_PRINT(" group %s", ipaddr_string(ndo, bp + 8));
301 if (EXTRACT_BE_U_4(bp + 12) != 0xffffffff)
302 ND_PRINT("/%s", ipaddr_string(ndo, bp + 12));
303 ND_PRINT(" RP %s hold ", ipaddr_string(ndo, bp + 16));
304 unsigned_relts_print(ndo, EXTRACT_BE_U_2(bp + 22));
305 }
306 break;
307 case PIMV1_TYPE_ASSERT:
308 ND_TCHECK_LEN(bp + 16, sizeof(struct in_addr));
309 ND_PRINT(" for %s > %s", ipaddr_string(ndo, bp + 16),
310 ipaddr_string(ndo, bp + 8));
311 if (EXTRACT_BE_U_4(bp + 12) != 0xffffffff)
312 ND_PRINT("/%s", ipaddr_string(ndo, bp + 12));
313 ND_TCHECK_4(bp + 24);
314 ND_PRINT(" %s pref %u metric %u",
315 (EXTRACT_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT",
316 EXTRACT_BE_U_4(bp + 20) & 0x7fffffff,
317 EXTRACT_BE_U_4(bp + 24));
318 break;
319 case PIMV1_TYPE_JOIN_PRUNE:
320 case PIMV1_TYPE_GRAFT:
321 case PIMV1_TYPE_GRAFT_ACK:
322 if (ndo->ndo_vflag) {
323 if (len < 8)
324 goto trunc;
325 pimv1_join_prune_print(ndo, bp + 8, len - 8);
326 }
327 break;
328 }
329 ND_TCHECK_1(bp + 4);
330 if ((EXTRACT_U_1(bp + 4) >> 4) != 1)
331 ND_PRINT(" [v%u]", EXTRACT_U_1(bp + 4) >> 4);
332 return;
333
334 trunc:
335 ND_PRINT("[|pim]");
336 return;
337 }
338
339 /*
340 * auto-RP is a cisco protocol, documented at
341 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
342 *
343 * This implements version 1+, dated Sept 9, 1998.
344 */
345 void
346 cisco_autorp_print(netdissect_options *ndo,
347 const u_char *bp, u_int len)
348 {
349 u_int type;
350 u_int numrps;
351 u_int hold;
352
353 if (len < 8)
354 goto trunc;
355 ND_TCHECK_1(bp);
356 ND_PRINT(" auto-rp ");
357 type = EXTRACT_U_1(bp);
358 switch (type) {
359 case 0x11:
360 ND_PRINT("candidate-advert");
361 break;
362 case 0x12:
363 ND_PRINT("mapping");
364 break;
365 default:
366 ND_PRINT("type-0x%02x", type);
367 break;
368 }
369
370 ND_TCHECK_1(bp + 1);
371 numrps = EXTRACT_U_1(bp + 1);
372
373 ND_TCHECK_2(bp + 2);
374 ND_PRINT(" Hold ");
375 hold = EXTRACT_BE_U_2(bp + 2);
376 if (hold)
377 unsigned_relts_print(ndo, EXTRACT_BE_U_2(bp + 2));
378 else
379 ND_PRINT("FOREVER");
380
381 /* Next 4 bytes are reserved. */
382
383 bp += 8; len -= 8;
384
385 /*XXX skip unless -v? */
386
387 /*
388 * Rest of packet:
389 * numrps entries of the form:
390 * 32 bits: RP
391 * 6 bits: reserved
392 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
393 * 8 bits: # of entries for this RP
394 * each entry: 7 bits: reserved, 1 bit: negative,
395 * 8 bits: mask 32 bits: source
396 * lather, rinse, repeat.
397 */
398 while (numrps != 0) {
399 u_int nentries;
400 char s;
401
402 if (len < 4)
403 goto trunc;
404 ND_TCHECK_4(bp);
405 ND_PRINT(" RP %s", ipaddr_string(ndo, bp));
406 bp += 4;
407 len -= 4;
408 if (len < 1)
409 goto trunc;
410 ND_TCHECK_1(bp);
411 switch (EXTRACT_U_1(bp) & 0x3) {
412 case 0: ND_PRINT(" PIMv?");
413 break;
414 case 1: ND_PRINT(" PIMv1");
415 break;
416 case 2: ND_PRINT(" PIMv2");
417 break;
418 case 3: ND_PRINT(" PIMv1+2");
419 break;
420 }
421 if (EXTRACT_U_1(bp) & 0xfc)
422 ND_PRINT(" [rsvd=0x%02x]", EXTRACT_U_1(bp) & 0xfc);
423 bp += 1;
424 len -= 1;
425 if (len < 1)
426 goto trunc;
427 ND_TCHECK_1(bp);
428 nentries = EXTRACT_U_1(bp);
429 bp += 1;
430 len -= 1;
431 s = ' ';
432 while (nentries != 0) {
433 if (len < 6)
434 goto trunc;
435 ND_TCHECK_6(bp);
436 ND_PRINT("%c%s%s/%u", s, EXTRACT_U_1(bp) & 1 ? "!" : "",
437 ipaddr_string(ndo, bp + 2), EXTRACT_U_1(bp + 1));
438 if (EXTRACT_U_1(bp) & 0x02) {
439 ND_PRINT(" bidir");
440 }
441 if (EXTRACT_U_1(bp) & 0xfc) {
442 ND_PRINT("[rsvd=0x%02x]", EXTRACT_U_1(bp) & 0xfc);
443 }
444 s = ',';
445 bp += 6; len -= 6;
446 nentries--;
447 }
448 numrps--;
449 }
450 return;
451
452 trunc:
453 ND_PRINT("[|autorp]");
454 return;
455 }
456
457 void
458 pim_print(netdissect_options *ndo,
459 const u_char *bp, u_int len, const u_char *bp2)
460 {
461 const struct pim *pim = (const struct pim *)bp;
462 uint8_t pim_typever;
463
464 #ifdef notyet /* currently we see only version and type */
465 ND_TCHECK_1(pim->pim_rsv);
466 #endif
467
468 ND_TCHECK_1(pim->pim_typever);
469 pim_typever = EXTRACT_U_1(pim->pim_typever);
470 switch (PIM_VER(pim_typever)) {
471 case 2:
472 if (!ndo->ndo_vflag) {
473 ND_PRINT("PIMv%u, %s, length %u",
474 PIM_VER(pim_typever),
475 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)),
476 len);
477 return;
478 } else {
479 ND_PRINT("PIMv%u, length %u\n\t%s",
480 PIM_VER(pim_typever),
481 len,
482 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)));
483 pimv2_print(ndo, bp, len, bp2);
484 }
485 break;
486 default:
487 ND_PRINT("PIMv%u, length %u",
488 PIM_VER(pim_typever),
489 len);
490 break;
491 }
492 return;
493
494 trunc:
495 ND_PRINT("[|pim]");
496 return;
497 }
498
499 /*
500 * PIMv2 uses encoded address representations.
501 *
502 * The last PIM-SM I-D before RFC2117 was published specified the
503 * following representation for unicast addresses. However, RFC2117
504 * specified no encoding for unicast addresses with the unicast
505 * address length specified in the header. Therefore, we have to
506 * guess which encoding is being used (Cisco's PIMv2 implementation
507 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
508 * field into a 'unicast-address-length-in-bytes' field. We guess
509 * that it's the draft encoding if this reserved field is zero.
510 *
511 * RFC2362 goes back to the encoded format, and calls the addr length
512 * field "reserved" again.
513 *
514 * The first byte is the address family, from:
515 *
516 * 0 Reserved
517 * 1 IP (IP version 4)
518 * 2 IP6 (IP version 6)
519 * 3 NSAP
520 * 4 HDLC (8-bit multidrop)
521 * 5 BBN 1822
522 * 6 802 (includes all 802 media plus Ethernet "canonical format")
523 * 7 E.163
524 * 8 E.164 (SMDS, Frame Relay, ATM)
525 * 9 F.69 (Telex)
526 * 10 X.121 (X.25, Frame Relay)
527 * 11 IPX
528 * 12 Appletalk
529 * 13 Decnet IV
530 * 14 Banyan Vines
531 * 15 E.164 with NSAP format subaddress
532 *
533 * In addition, the second byte is an "Encoding". 0 is the default
534 * encoding for the address family, and no other encodings are currently
535 * specified.
536 *
537 */
538
539 enum pimv2_addrtype {
540 pimv2_unicast, pimv2_group, pimv2_source
541 };
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 | Unicast Address |
547 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
548 * 0 1 2 3
549 * 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
550 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
551 * | Addr Family | Encoding Type | Reserved | Mask Len |
552 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
553 * | Group multicast Address |
554 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
555 * 0 1 2 3
556 * 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
557 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
558 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
559 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
560 * | Source Address |
561 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
562 */
563 static int
564 pimv2_addr_print(netdissect_options *ndo,
565 const u_char *bp, u_int len, enum pimv2_addrtype at,
566 u_int addr_len, int silent)
567 {
568 u_int af;
569 int hdrlen;
570
571 if (addr_len == 0) {
572 if (len < 2)
573 goto trunc;
574 ND_TCHECK_1(bp + 1);
575 switch (EXTRACT_U_1(bp)) {
576 case 1:
577 af = AF_INET;
578 addr_len = (u_int)sizeof(struct in_addr);
579 break;
580 case 2:
581 af = AF_INET6;
582 addr_len = (u_int)sizeof(struct in6_addr);
583 break;
584 default:
585 return -1;
586 }
587 if (EXTRACT_U_1(bp + 1) != 0)
588 return -1;
589 hdrlen = 2;
590 } else {
591 switch (addr_len) {
592 case sizeof(struct in_addr):
593 af = AF_INET;
594 break;
595 case sizeof(struct in6_addr):
596 af = AF_INET6;
597 break;
598 default:
599 return -1;
600 break;
601 }
602 hdrlen = 0;
603 }
604
605 bp += hdrlen;
606 len -= hdrlen;
607 switch (at) {
608 case pimv2_unicast:
609 if (len < addr_len)
610 goto trunc;
611 ND_TCHECK_LEN(bp, addr_len);
612 if (af == AF_INET) {
613 if (!silent)
614 ND_PRINT("%s", ipaddr_string(ndo, bp));
615 }
616 else if (af == AF_INET6) {
617 if (!silent)
618 ND_PRINT("%s", ip6addr_string(ndo, bp));
619 }
620 return hdrlen + addr_len;
621 case pimv2_group:
622 case pimv2_source:
623 if (len < addr_len + 2)
624 goto trunc;
625 ND_TCHECK_LEN(bp, addr_len + 2);
626 if (af == AF_INET) {
627 if (!silent) {
628 ND_PRINT("%s", ipaddr_string(ndo, bp + 2));
629 if (EXTRACT_U_1(bp + 1) != 32)
630 ND_PRINT("/%u", EXTRACT_U_1(bp + 1));
631 }
632 }
633 else if (af == AF_INET6) {
634 if (!silent) {
635 ND_PRINT("%s", ip6addr_string(ndo, bp + 2));
636 if (EXTRACT_U_1(bp + 1) != 128)
637 ND_PRINT("/%u", EXTRACT_U_1(bp + 1));
638 }
639 }
640 if (EXTRACT_U_1(bp) && !silent) {
641 if (at == pimv2_group) {
642 ND_PRINT("(0x%02x)", EXTRACT_U_1(bp));
643 } else {
644 ND_PRINT("(%s%s%s",
645 EXTRACT_U_1(bp) & 0x04 ? "S" : "",
646 EXTRACT_U_1(bp) & 0x02 ? "W" : "",
647 EXTRACT_U_1(bp) & 0x01 ? "R" : "");
648 if (EXTRACT_U_1(bp) & 0xf8) {
649 ND_PRINT("+0x%02x", EXTRACT_U_1(bp) & 0xf8);
650 }
651 ND_PRINT(")");
652 }
653 }
654 return hdrlen + 2 + addr_len;
655 default:
656 return -1;
657 }
658 trunc:
659 return -1;
660 }
661
662 enum checksum_status {
663 CORRECT,
664 INCORRECT,
665 UNVERIFIED
666 };
667
668 static enum checksum_status
669 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
670 const u_char *bp2, u_int len)
671 {
672 const struct ip *ip;
673 u_int cksum;
674
675 if (!ND_TTEST_LEN(bp, len)) {
676 /* We don't have all the data. */
677 return (UNVERIFIED);
678 }
679 ip = (const struct ip *)bp2;
680 if (IP_V(ip) == 4) {
681 struct cksum_vec vec[1];
682
683 vec[0].ptr = bp;
684 vec[0].len = len;
685 cksum = in_cksum(vec, 1);
686 return (cksum ? INCORRECT : CORRECT);
687 } else if (IP_V(ip) == 6) {
688 const struct ip6_hdr *ip6;
689
690 ip6 = (const struct ip6_hdr *)bp2;
691 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
692 return (cksum ? INCORRECT : CORRECT);
693 } else {
694 return (UNVERIFIED);
695 }
696 }
697
698 static void
699 pimv2_print(netdissect_options *ndo,
700 const u_char *bp, u_int len, const u_char *bp2)
701 {
702 const struct pim *pim = (const struct pim *)bp;
703 int advance;
704 enum checksum_status cksum_status;
705 u_int pim_typever;
706 u_int pimv2_addr_len;
707
708 if (len < 2)
709 goto trunc;
710 ND_TCHECK_1(pim->pim_rsv);
711 pim_typever = EXTRACT_U_1(pim->pim_typever);
712 pimv2_addr_len = EXTRACT_U_1(pim->pim_rsv);
713 if (pimv2_addr_len != 0)
714 ND_PRINT(", RFC2117-encoding");
715
716 if (len < 4)
717 goto trunc;
718 ND_TCHECK_2(pim->pim_cksum);
719 ND_PRINT(", cksum 0x%04x ", EXTRACT_BE_U_2(pim->pim_cksum));
720 if (EXTRACT_BE_U_2(pim->pim_cksum) == 0) {
721 ND_PRINT("(unverified)");
722 } else {
723 if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) {
724 /*
725 * The checksum only covers the packet header,
726 * not the encapsulated packet.
727 */
728 cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
729 if (cksum_status == INCORRECT) {
730 /*
731 * To quote RFC 4601, "For interoperability
732 * reasons, a message carrying a checksum
733 * calculated over the entire PIM Register
734 * message should also be accepted."
735 */
736 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
737 }
738 } else {
739 /*
740 * The checksum covers the entire packet.
741 */
742 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
743 }
744 switch (cksum_status) {
745
746 case CORRECT:
747 ND_PRINT("(correct)");
748 break;
749
750 case INCORRECT:
751 ND_PRINT("(incorrect)");
752 break;
753
754 case UNVERIFIED:
755 ND_PRINT("(unverified)");
756 break;
757 }
758 }
759 bp += 4;
760 len -= 4;
761
762 switch (PIM_TYPE(pim_typever)) {
763 case PIMV2_TYPE_HELLO:
764 {
765 uint16_t otype, olen;
766 while (len > 0) {
767 if (len < 4)
768 goto trunc;
769 ND_TCHECK_4(bp);
770 otype = EXTRACT_BE_U_2(bp);
771 olen = EXTRACT_BE_U_2(bp + 2);
772 ND_PRINT("\n\t %s Option (%u), length %u, Value: ",
773 tok2str(pimv2_hello_option_values, "Unknown", otype),
774 otype,
775 olen);
776 bp += 4;
777 len -= 4;
778
779 if (len < olen)
780 goto trunc;
781 ND_TCHECK_LEN(bp, olen);
782 switch (otype) {
783 case PIMV2_HELLO_OPTION_HOLDTIME:
784 if (olen != 2) {
785 ND_PRINT("ERROR: Option Length != 2 Bytes (%u)", olen);
786 } else {
787 unsigned_relts_print(ndo,
788 EXTRACT_BE_U_2(bp));
789 }
790 break;
791
792 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
793 if (olen != 4) {
794 ND_PRINT("ERROR: Option Length != 4 Bytes (%u)", olen);
795 } else {
796 char t_bit;
797 uint16_t lan_delay, override_interval;
798 lan_delay = EXTRACT_BE_U_2(bp);
799 override_interval = EXTRACT_BE_U_2(bp + 2);
800 t_bit = (lan_delay & 0x8000)? 1 : 0;
801 lan_delay &= ~0x8000;
802 ND_PRINT("\n\t T-bit=%u, LAN delay %ums, Override interval %ums",
803 t_bit, lan_delay, override_interval);
804 }
805 break;
806
807 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
808 case PIMV2_HELLO_OPTION_DR_PRIORITY:
809 switch (olen) {
810 case 0:
811 ND_PRINT("Bi-Directional Capability (Old)");
812 break;
813 case 4:
814 ND_PRINT("%u", EXTRACT_BE_U_4(bp));
815 break;
816 default:
817 ND_PRINT("ERROR: Option Length != 4 Bytes (%u)", olen);
818 break;
819 }
820 break;
821
822 case PIMV2_HELLO_OPTION_GENID:
823 if (olen != 4) {
824 ND_PRINT("ERROR: Option Length != 4 Bytes (%u)", olen);
825 } else {
826 ND_PRINT("0x%08x", EXTRACT_BE_U_4(bp));
827 }
828 break;
829
830 case PIMV2_HELLO_OPTION_REFRESH_CAP:
831 if (olen != 4) {
832 ND_PRINT("ERROR: Option Length != 4 Bytes (%u)", olen);
833 } else {
834 ND_PRINT("v%u", EXTRACT_U_1(bp));
835 if (EXTRACT_U_1(bp + 1) != 0) {
836 ND_PRINT(", interval ");
837 unsigned_relts_print(ndo,
838 EXTRACT_U_1(bp + 1));
839 }
840 if (EXTRACT_BE_U_2(bp + 2) != 0) {
841 ND_PRINT(" ?0x%04x?", EXTRACT_BE_U_2(bp + 2));
842 }
843 }
844 break;
845
846 case PIMV2_HELLO_OPTION_BIDIR_CAP:
847 break;
848
849 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
850 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
851 if (ndo->ndo_vflag > 1) {
852 const u_char *ptr = bp;
853 u_int plen = len;
854 while (ptr < (bp+olen)) {
855 ND_PRINT("\n\t ");
856 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
857 if (advance < 0)
858 goto trunc;
859 ptr += advance;
860 plen -= advance;
861 }
862 }
863 break;
864 default:
865 if (ndo->ndo_vflag <= 1)
866 print_unknown_data(ndo, bp, "\n\t ", olen);
867 break;
868 }
869 /* do we want to see an additionally hexdump ? */
870 if (ndo->ndo_vflag> 1)
871 print_unknown_data(ndo, bp, "\n\t ", olen);
872 bp += olen;
873 len -= olen;
874 }
875 break;
876 }
877
878 case PIMV2_TYPE_REGISTER:
879 {
880 const struct ip *ip;
881
882 if (len < 4)
883 goto trunc;
884 ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN);
885
886 ND_PRINT(", Flags [ %s ]\n\t",
887 tok2str(pimv2_register_flag_values,
888 "none",
889 EXTRACT_BE_U_4(bp)));
890
891 bp += 4; len -= 4;
892 /* encapsulated multicast packet */
893 if (len == 0)
894 goto trunc;
895 ip = (const struct ip *)bp;
896 ND_TCHECK_1(ip->ip_vhl);
897 switch (IP_V(ip)) {
898 case 0: /* Null header */
899 ND_TCHECK(ip->ip_dst);
900 ND_PRINT("IP-Null-header %s > %s",
901 ipaddr_string(ndo, &ip->ip_src),
902 ipaddr_string(ndo, &ip->ip_dst));
903 break;
904
905 case 4: /* IPv4 */
906 ip_print(ndo, bp, len);
907 break;
908
909 case 6: /* IPv6 */
910 ip6_print(ndo, bp, len);
911 break;
912
913 default:
914 ND_PRINT("IP ver %u", IP_V(ip));
915 break;
916 }
917 break;
918 }
919
920 case PIMV2_TYPE_REGISTER_STOP:
921 ND_PRINT(" group=");
922 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
923 goto trunc;
924 bp += advance; len -= advance;
925 ND_PRINT(" source=");
926 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
927 goto trunc;
928 bp += advance; len -= advance;
929 break;
930
931 case PIMV2_TYPE_JOIN_PRUNE:
932 case PIMV2_TYPE_GRAFT:
933 case PIMV2_TYPE_GRAFT_ACK:
934
935
936 /*
937 * 0 1 2 3
938 * 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
939 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
940 * |PIM Ver| Type | Addr length | Checksum |
941 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
942 * | Unicast-Upstream Neighbor Address |
943 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
944 * | Reserved | Num groups | Holdtime |
945 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
946 * | Encoded-Multicast Group Address-1 |
947 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
948 * | Number of Joined Sources | Number of Pruned Sources |
949 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
950 * | Encoded-Joined Source Address-1 |
951 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
952 * | . |
953 * | . |
954 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
955 * | Encoded-Joined Source Address-n |
956 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
957 * | Encoded-Pruned Source Address-1 |
958 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
959 * | . |
960 * | . |
961 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
962 * | Encoded-Pruned Source Address-n |
963 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
964 * | . |
965 * | . |
966 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
967 * | Encoded-Multicast Group Address-n |
968 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
969 */
970
971 {
972 uint8_t ngroup;
973 uint16_t holdtime;
974 uint16_t njoin;
975 uint16_t nprune;
976 u_int i, j;
977
978 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
979 ND_PRINT(", upstream-neighbor: ");
980 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
981 goto trunc;
982 bp += advance; len -= advance;
983 }
984 if (len < 4)
985 goto trunc;
986 ND_TCHECK_4(bp);
987 ngroup = EXTRACT_U_1(bp + 1);
988 holdtime = EXTRACT_BE_U_2(bp + 2);
989 ND_PRINT("\n\t %u group(s)", ngroup);
990 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
991 ND_PRINT(", holdtime: ");
992 if (holdtime == 0xffff)
993 ND_PRINT("infinite");
994 else
995 unsigned_relts_print(ndo, holdtime);
996 }
997 bp += 4; len -= 4;
998 for (i = 0; i < ngroup; i++) {
999 ND_PRINT("\n\t group #%u: ", i+1);
1000 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1001 goto trunc;
1002 bp += advance; len -= advance;
1003 if (len < 4)
1004 goto trunc;
1005 ND_TCHECK_4(bp);
1006 njoin = EXTRACT_BE_U_2(bp);
1007 nprune = EXTRACT_BE_U_2(bp + 2);
1008 ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune);
1009 bp += 4; len -= 4;
1010 for (j = 0; j < njoin; j++) {
1011 ND_PRINT("\n\t joined source #%u: ", j+1);
1012 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1013 goto trunc;
1014 bp += advance; len -= advance;
1015 }
1016 for (j = 0; j < nprune; j++) {
1017 ND_PRINT("\n\t pruned source #%u: ", j+1);
1018 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1019 goto trunc;
1020 bp += advance; len -= advance;
1021 }
1022 }
1023 break;
1024 }
1025
1026 case PIMV2_TYPE_BOOTSTRAP:
1027 {
1028 u_int i, j, frpcnt;
1029
1030 /* Fragment Tag, Hash Mask len, and BSR-priority */
1031 if (len < 2)
1032 goto trunc;
1033 ND_TCHECK_2(bp);
1034 ND_PRINT(" tag=%x", EXTRACT_BE_U_2(bp));
1035 bp += 2;
1036 len -= 2;
1037 if (len < 1)
1038 goto trunc;
1039 ND_TCHECK_1(bp);
1040 ND_PRINT(" hashmlen=%u", EXTRACT_U_1(bp));
1041 if (len < 2)
1042 goto trunc;
1043 ND_TCHECK_1(bp + 2);
1044 ND_PRINT(" BSRprio=%u", EXTRACT_U_1(bp + 1));
1045 bp += 2;
1046 len -= 2;
1047
1048 /* Encoded-Unicast-BSR-Address */
1049 ND_PRINT(" BSR=");
1050 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1051 goto trunc;
1052 bp += advance;
1053 len -= advance;
1054
1055 for (i = 0; len > 0; i++) {
1056 /* Encoded-Group Address */
1057 ND_PRINT(" (group%u: ", i);
1058 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1059 goto trunc;
1060 bp += advance;
1061 len -= advance;
1062
1063 /* RP-Count, Frag RP-Cnt, and rsvd */
1064 if (len < 1)
1065 goto trunc;
1066 ND_TCHECK_1(bp);
1067 ND_PRINT(" RPcnt=%u", EXTRACT_U_1(bp));
1068 if (len < 2)
1069 goto trunc;
1070 ND_TCHECK_1(bp + 1);
1071 frpcnt = EXTRACT_U_1(bp + 1);
1072 ND_PRINT(" FRPcnt=%u", frpcnt);
1073 if (len < 4)
1074 goto trunc;
1075 bp += 4;
1076 len -= 4;
1077
1078 for (j = 0; j < frpcnt && len > 0; j++) {
1079 /* each RP info */
1080 ND_PRINT(" RP%u=", j);
1081 if ((advance = pimv2_addr_print(ndo, bp, len,
1082 pimv2_unicast,
1083 pimv2_addr_len,
1084 0)) < 0)
1085 goto trunc;
1086 bp += advance;
1087 len -= advance;
1088
1089 if (len < 2)
1090 goto trunc;
1091 ND_TCHECK_2(bp);
1092 ND_PRINT(",holdtime=");
1093 unsigned_relts_print(ndo,
1094 EXTRACT_BE_U_2(bp));
1095 if (len < 3)
1096 goto trunc;
1097 ND_TCHECK_1(bp + 2);
1098 ND_PRINT(",prio=%u", EXTRACT_U_1(bp + 2));
1099 if (len < 4)
1100 goto trunc;
1101 bp += 4;
1102 len -= 4;
1103 }
1104 ND_PRINT(")");
1105 }
1106 break;
1107 }
1108 case PIMV2_TYPE_ASSERT:
1109 ND_PRINT(" group=");
1110 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1111 goto trunc;
1112 bp += advance; len -= advance;
1113 ND_PRINT(" src=");
1114 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1115 goto trunc;
1116 bp += advance; len -= advance;
1117 if (len < 8)
1118 goto trunc;
1119 ND_TCHECK_8(bp);
1120 if (EXTRACT_U_1(bp) & 0x80)
1121 ND_PRINT(" RPT");
1122 ND_PRINT(" pref=%u", EXTRACT_BE_U_4(bp) & 0x7fffffff);
1123 ND_PRINT(" metric=%u", EXTRACT_BE_U_4(bp + 4));
1124 break;
1125
1126 case PIMV2_TYPE_CANDIDATE_RP:
1127 {
1128 u_int i, pfxcnt;
1129
1130 /* Prefix-Cnt, Priority, and Holdtime */
1131 if (len < 1)
1132 goto trunc;
1133 ND_TCHECK_1(bp);
1134 ND_PRINT(" prefix-cnt=%u", EXTRACT_U_1(bp));
1135 pfxcnt = EXTRACT_U_1(bp);
1136 if (len < 2)
1137 goto trunc;
1138 ND_TCHECK_1(bp + 1);
1139 ND_PRINT(" prio=%u", EXTRACT_U_1(bp + 1));
1140 if (len < 4)
1141 goto trunc;
1142 ND_TCHECK_2(bp + 2);
1143 ND_PRINT(" holdtime=");
1144 unsigned_relts_print(ndo, EXTRACT_BE_U_2(bp + 2));
1145 bp += 4;
1146 len -= 4;
1147
1148 /* Encoded-Unicast-RP-Address */
1149 ND_PRINT(" RP=");
1150 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1151 goto trunc;
1152 bp += advance;
1153 len -= advance;
1154
1155 /* Encoded-Group Addresses */
1156 for (i = 0; i < pfxcnt && len > 0; i++) {
1157 ND_PRINT(" Group%u=", i);
1158 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1159 goto trunc;
1160 bp += advance;
1161 len -= advance;
1162 }
1163 break;
1164 }
1165
1166 case PIMV2_TYPE_PRUNE_REFRESH:
1167 ND_PRINT(" src=");
1168 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1169 goto trunc;
1170 bp += advance;
1171 len -= advance;
1172 ND_PRINT(" grp=");
1173 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1174 goto trunc;
1175 bp += advance;
1176 len -= advance;
1177 ND_PRINT(" forwarder=");
1178 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1179 goto trunc;
1180 bp += advance;
1181 len -= advance;
1182 if (len < 2)
1183 goto trunc;
1184 ND_TCHECK_2(bp);
1185 ND_PRINT(" TUNR ");
1186 unsigned_relts_print(ndo, EXTRACT_BE_U_2(bp));
1187 break;
1188
1189
1190 default:
1191 ND_PRINT(" [type %u]", PIM_TYPE(pim_typever));
1192 break;
1193 }
1194
1195 return;
1196
1197 trunc:
1198 ND_PRINT("[|pim]");
1199 }
1200
1201 /*
1202 * Local Variables:
1203 * c-style: whitesmith
1204 * c-basic-offset: 8
1205 * End:
1206 */
[mirror] the TCPdump network dissector