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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(nd_ipv4))
173 goto trunc;
174 ND_TCHECK_LEN(bp, sizeof(nd_ipv4));
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(nd_ipv4));
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(nd_ipv4));
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_trunc(ndo);
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 ndo->ndo_protocol = "pimv1";
258 ND_TCHECK_1(bp + 1);
259 type = EXTRACT_U_1(bp + 1);
260
261 ND_PRINT(" %s", tok2str(pimv1_type_str, "[type %u]", type));
262 switch (type) {
263 case PIMV1_TYPE_QUERY:
264 if (ND_TTEST_1(bp + 8)) {
265 switch (EXTRACT_U_1(bp + 8) >> 4) {
266 case 0:
267 ND_PRINT(" Dense-mode");
268 break;
269 case 1:
270 ND_PRINT(" Sparse-mode");
271 break;
272 case 2:
273 ND_PRINT(" Sparse-Dense-mode");
274 break;
275 default:
276 ND_PRINT(" mode-%u", EXTRACT_U_1(bp + 8) >> 4);
277 break;
278 }
279 }
280 if (ndo->ndo_vflag) {
281 ND_TCHECK_2(bp + 10);
282 ND_PRINT(" (Hold-time ");
283 unsigned_relts_print(ndo, EXTRACT_BE_U_2(bp + 10));
284 ND_PRINT(")");
285 }
286 break;
287
288 case PIMV1_TYPE_REGISTER:
289 ND_TCHECK_LEN(bp + 8, 20); /* ip header */
290 ND_PRINT(" for %s > %s", ipaddr_string(ndo, bp + 20),
291 ipaddr_string(ndo, bp + 24));
292 break;
293 case PIMV1_TYPE_REGISTER_STOP:
294 ND_TCHECK_LEN(bp + 12, sizeof(nd_ipv4));
295 ND_PRINT(" for %s > %s", ipaddr_string(ndo, bp + 8),
296 ipaddr_string(ndo, bp + 12));
297 break;
298 case PIMV1_TYPE_RP_REACHABILITY:
299 if (ndo->ndo_vflag) {
300 ND_TCHECK_2(bp + 22);
301 ND_PRINT(" group %s", ipaddr_string(ndo, bp + 8));
302 if (EXTRACT_BE_U_4(bp + 12) != 0xffffffff)
303 ND_PRINT("/%s", ipaddr_string(ndo, bp + 12));
304 ND_PRINT(" RP %s hold ", ipaddr_string(ndo, bp + 16));
305 unsigned_relts_print(ndo, EXTRACT_BE_U_2(bp + 22));
306 }
307 break;
308 case PIMV1_TYPE_ASSERT:
309 ND_TCHECK_LEN(bp + 16, sizeof(nd_ipv4));
310 ND_PRINT(" for %s > %s", ipaddr_string(ndo, bp + 16),
311 ipaddr_string(ndo, bp + 8));
312 if (EXTRACT_BE_U_4(bp + 12) != 0xffffffff)
313 ND_PRINT("/%s", ipaddr_string(ndo, bp + 12));
314 ND_TCHECK_4(bp + 24);
315 ND_PRINT(" %s pref %u metric %u",
316 (EXTRACT_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT",
317 EXTRACT_BE_U_4(bp + 20) & 0x7fffffff,
318 EXTRACT_BE_U_4(bp + 24));
319 break;
320 case PIMV1_TYPE_JOIN_PRUNE:
321 case PIMV1_TYPE_GRAFT:
322 case PIMV1_TYPE_GRAFT_ACK:
323 if (ndo->ndo_vflag) {
324 if (len < 8)
325 goto trunc;
326 pimv1_join_prune_print(ndo, bp + 8, len - 8);
327 }
328 break;
329 }
330 ND_TCHECK_1(bp + 4);
331 if ((EXTRACT_U_1(bp + 4) >> 4) != 1)
332 ND_PRINT(" [v%u]", EXTRACT_U_1(bp + 4) >> 4);
333 return;
334
335 trunc:
336 nd_print_trunc(ndo);
337 return;
338 }
339
340 /*
341 * auto-RP is a cisco protocol, documented at
342 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
343 *
344 * This implements version 1+, dated Sept 9, 1998.
345 */
346 void
347 cisco_autorp_print(netdissect_options *ndo,
348 const u_char *bp, u_int len)
349 {
350 u_int type;
351 u_int numrps;
352 u_int hold;
353
354 ndo->ndo_protocol = "cisco_autorp";
355 if (len < 8)
356 goto trunc;
357 ND_TCHECK_1(bp);
358 ND_PRINT(" auto-rp ");
359 type = EXTRACT_U_1(bp);
360 switch (type) {
361 case 0x11:
362 ND_PRINT("candidate-advert");
363 break;
364 case 0x12:
365 ND_PRINT("mapping");
366 break;
367 default:
368 ND_PRINT("type-0x%02x", type);
369 break;
370 }
371
372 ND_TCHECK_1(bp + 1);
373 numrps = EXTRACT_U_1(bp + 1);
374
375 ND_TCHECK_2(bp + 2);
376 ND_PRINT(" Hold ");
377 hold = EXTRACT_BE_U_2(bp + 2);
378 if (hold)
379 unsigned_relts_print(ndo, EXTRACT_BE_U_2(bp + 2));
380 else
381 ND_PRINT("FOREVER");
382
383 /* Next 4 bytes are reserved. */
384
385 bp += 8; len -= 8;
386
387 /*XXX skip unless -v? */
388
389 /*
390 * Rest of packet:
391 * numrps entries of the form:
392 * 32 bits: RP
393 * 6 bits: reserved
394 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
395 * 8 bits: # of entries for this RP
396 * each entry: 7 bits: reserved, 1 bit: negative,
397 * 8 bits: mask 32 bits: source
398 * lather, rinse, repeat.
399 */
400 while (numrps != 0) {
401 u_int nentries;
402 char s;
403
404 if (len < 4)
405 goto trunc;
406 ND_TCHECK_4(bp);
407 ND_PRINT(" RP %s", ipaddr_string(ndo, bp));
408 bp += 4;
409 len -= 4;
410 if (len < 1)
411 goto trunc;
412 ND_TCHECK_1(bp);
413 switch (EXTRACT_U_1(bp) & 0x3) {
414 case 0: ND_PRINT(" PIMv?");
415 break;
416 case 1: ND_PRINT(" PIMv1");
417 break;
418 case 2: ND_PRINT(" PIMv2");
419 break;
420 case 3: ND_PRINT(" PIMv1+2");
421 break;
422 }
423 if (EXTRACT_U_1(bp) & 0xfc)
424 ND_PRINT(" [rsvd=0x%02x]", EXTRACT_U_1(bp) & 0xfc);
425 bp += 1;
426 len -= 1;
427 if (len < 1)
428 goto trunc;
429 ND_TCHECK_1(bp);
430 nentries = EXTRACT_U_1(bp);
431 bp += 1;
432 len -= 1;
433 s = ' ';
434 while (nentries != 0) {
435 if (len < 6)
436 goto trunc;
437 ND_TCHECK_6(bp);
438 ND_PRINT("%c%s%s/%u", s, EXTRACT_U_1(bp) & 1 ? "!" : "",
439 ipaddr_string(ndo, bp + 2), EXTRACT_U_1(bp + 1));
440 if (EXTRACT_U_1(bp) & 0x02) {
441 ND_PRINT(" bidir");
442 }
443 if (EXTRACT_U_1(bp) & 0xfc) {
444 ND_PRINT("[rsvd=0x%02x]", EXTRACT_U_1(bp) & 0xfc);
445 }
446 s = ',';
447 bp += 6; len -= 6;
448 nentries--;
449 }
450 numrps--;
451 }
452 return;
453
454 trunc:
455 nd_print_trunc(ndo);
456 return;
457 }
458
459 void
460 pim_print(netdissect_options *ndo,
461 const u_char *bp, u_int len, const u_char *bp2)
462 {
463 const struct pim *pim = (const struct pim *)bp;
464 uint8_t pim_typever;
465
466 ndo->ndo_protocol = "pim";
467 #ifdef notyet /* currently we see only version and type */
468 ND_TCHECK_1(pim->pim_rsv);
469 #endif
470
471 ND_TCHECK_1(pim->pim_typever);
472 pim_typever = EXTRACT_U_1(pim->pim_typever);
473 switch (PIM_VER(pim_typever)) {
474 case 2:
475 if (!ndo->ndo_vflag) {
476 ND_PRINT("PIMv%u, %s, length %u",
477 PIM_VER(pim_typever),
478 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)),
479 len);
480 return;
481 } else {
482 ND_PRINT("PIMv%u, length %u\n\t%s",
483 PIM_VER(pim_typever),
484 len,
485 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)));
486 pimv2_print(ndo, bp, len, bp2);
487 }
488 break;
489 default:
490 ND_PRINT("PIMv%u, length %u",
491 PIM_VER(pim_typever),
492 len);
493 break;
494 }
495 return;
496
497 trunc:
498 nd_print_trunc(ndo);
499 return;
500 }
501
502 /*
503 * PIMv2 uses encoded address representations.
504 *
505 * The last PIM-SM I-D before RFC2117 was published specified the
506 * following representation for unicast addresses. However, RFC2117
507 * specified no encoding for unicast addresses with the unicast
508 * address length specified in the header. Therefore, we have to
509 * guess which encoding is being used (Cisco's PIMv2 implementation
510 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
511 * field into a 'unicast-address-length-in-bytes' field. We guess
512 * that it's the draft encoding if this reserved field is zero.
513 *
514 * RFC2362 goes back to the encoded format, and calls the addr length
515 * field "reserved" again.
516 *
517 * The first byte is the address family, from:
518 *
519 * 0 Reserved
520 * 1 IP (IP version 4)
521 * 2 IP6 (IP version 6)
522 * 3 NSAP
523 * 4 HDLC (8-bit multidrop)
524 * 5 BBN 1822
525 * 6 802 (includes all 802 media plus Ethernet "canonical format")
526 * 7 E.163
527 * 8 E.164 (SMDS, Frame Relay, ATM)
528 * 9 F.69 (Telex)
529 * 10 X.121 (X.25, Frame Relay)
530 * 11 IPX
531 * 12 Appletalk
532 * 13 Decnet IV
533 * 14 Banyan Vines
534 * 15 E.164 with NSAP format subaddress
535 *
536 * In addition, the second byte is an "Encoding". 0 is the default
537 * encoding for the address family, and no other encodings are currently
538 * specified.
539 *
540 */
541
542 enum pimv2_addrtype {
543 pimv2_unicast, pimv2_group, pimv2_source
544 };
545
546 /* 0 1 2 3
547 * 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
548 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
549 * | Addr Family | Encoding Type | Unicast Address |
550 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
551 * 0 1 2 3
552 * 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
553 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
554 * | Addr Family | Encoding Type | Reserved | Mask Len |
555 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
556 * | Group multicast Address |
557 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
558 * 0 1 2 3
559 * 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
560 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
561 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
562 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
563 * | Source Address |
564 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
565 */
566 static int
567 pimv2_addr_print(netdissect_options *ndo,
568 const u_char *bp, u_int len, enum pimv2_addrtype at,
569 u_int addr_len, int silent)
570 {
571 u_int af;
572 int hdrlen;
573
574 if (addr_len == 0) {
575 if (len < 2)
576 goto trunc;
577 ND_TCHECK_1(bp + 1);
578 switch (EXTRACT_U_1(bp)) {
579 case 1:
580 af = AF_INET;
581 addr_len = (u_int)sizeof(nd_ipv4);
582 break;
583 case 2:
584 af = AF_INET6;
585 addr_len = (u_int)sizeof(nd_ipv6);
586 break;
587 default:
588 return -1;
589 }
590 if (EXTRACT_U_1(bp + 1) != 0)
591 return -1;
592 hdrlen = 2;
593 } else {
594 switch (addr_len) {
595 case sizeof(nd_ipv4):
596 af = AF_INET;
597 break;
598 case sizeof(nd_ipv6):
599 af = AF_INET6;
600 break;
601 default:
602 return -1;
603 break;
604 }
605 hdrlen = 0;
606 }
607
608 bp += hdrlen;
609 len -= hdrlen;
610 switch (at) {
611 case pimv2_unicast:
612 if (len < addr_len)
613 goto trunc;
614 ND_TCHECK_LEN(bp, addr_len);
615 if (af == AF_INET) {
616 if (!silent)
617 ND_PRINT("%s", ipaddr_string(ndo, bp));
618 }
619 else if (af == AF_INET6) {
620 if (!silent)
621 ND_PRINT("%s", ip6addr_string(ndo, bp));
622 }
623 return hdrlen + addr_len;
624 case pimv2_group:
625 case pimv2_source:
626 if (len < addr_len + 2)
627 goto trunc;
628 ND_TCHECK_LEN(bp, addr_len + 2);
629 if (af == AF_INET) {
630 if (!silent) {
631 ND_PRINT("%s", ipaddr_string(ndo, bp + 2));
632 if (EXTRACT_U_1(bp + 1) != 32)
633 ND_PRINT("/%u", EXTRACT_U_1(bp + 1));
634 }
635 }
636 else if (af == AF_INET6) {
637 if (!silent) {
638 ND_PRINT("%s", ip6addr_string(ndo, bp + 2));
639 if (EXTRACT_U_1(bp + 1) != 128)
640 ND_PRINT("/%u", EXTRACT_U_1(bp + 1));
641 }
642 }
643 if (EXTRACT_U_1(bp) && !silent) {
644 if (at == pimv2_group) {
645 ND_PRINT("(0x%02x)", EXTRACT_U_1(bp));
646 } else {
647 ND_PRINT("(%s%s%s",
648 EXTRACT_U_1(bp) & 0x04 ? "S" : "",
649 EXTRACT_U_1(bp) & 0x02 ? "W" : "",
650 EXTRACT_U_1(bp) & 0x01 ? "R" : "");
651 if (EXTRACT_U_1(bp) & 0xf8) {
652 ND_PRINT("+0x%02x", EXTRACT_U_1(bp) & 0xf8);
653 }
654 ND_PRINT(")");
655 }
656 }
657 return hdrlen + 2 + addr_len;
658 default:
659 return -1;
660 }
661 trunc:
662 return -1;
663 }
664
665 enum checksum_status {
666 CORRECT,
667 INCORRECT,
668 UNVERIFIED
669 };
670
671 static enum checksum_status
672 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
673 const u_char *bp2, u_int len)
674 {
675 const struct ip *ip;
676 u_int cksum;
677
678 if (!ND_TTEST_LEN(bp, len)) {
679 /* We don't have all the data. */
680 return (UNVERIFIED);
681 }
682 ip = (const struct ip *)bp2;
683 if (IP_V(ip) == 4) {
684 struct cksum_vec vec[1];
685
686 vec[0].ptr = bp;
687 vec[0].len = len;
688 cksum = in_cksum(vec, 1);
689 return (cksum ? INCORRECT : CORRECT);
690 } else if (IP_V(ip) == 6) {
691 const struct ip6_hdr *ip6;
692
693 ip6 = (const struct ip6_hdr *)bp2;
694 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
695 return (cksum ? INCORRECT : CORRECT);
696 } else {
697 return (UNVERIFIED);
698 }
699 }
700
701 static void
702 pimv2_print(netdissect_options *ndo,
703 const u_char *bp, u_int len, const u_char *bp2)
704 {
705 const struct pim *pim = (const struct pim *)bp;
706 int advance;
707 enum checksum_status cksum_status;
708 u_int pim_typever;
709 u_int pimv2_addr_len;
710
711 ndo->ndo_protocol = "pimv2";
712 if (len < 2)
713 goto trunc;
714 ND_TCHECK_1(pim->pim_rsv);
715 pim_typever = EXTRACT_U_1(pim->pim_typever);
716 pimv2_addr_len = EXTRACT_U_1(pim->pim_rsv);
717 if (pimv2_addr_len != 0)
718 ND_PRINT(", RFC2117-encoding");
719
720 if (len < 4)
721 goto trunc;
722 ND_TCHECK_2(pim->pim_cksum);
723 ND_PRINT(", cksum 0x%04x ", EXTRACT_BE_U_2(pim->pim_cksum));
724 if (EXTRACT_BE_U_2(pim->pim_cksum) == 0) {
725 ND_PRINT("(unverified)");
726 } else {
727 if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) {
728 /*
729 * The checksum only covers the packet header,
730 * not the encapsulated packet.
731 */
732 cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
733 if (cksum_status == INCORRECT) {
734 /*
735 * To quote RFC 4601, "For interoperability
736 * reasons, a message carrying a checksum
737 * calculated over the entire PIM Register
738 * message should also be accepted."
739 */
740 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
741 }
742 } else {
743 /*
744 * The checksum covers the entire packet.
745 */
746 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
747 }
748 switch (cksum_status) {
749
750 case CORRECT:
751 ND_PRINT("(correct)");
752 break;
753
754 case INCORRECT:
755 ND_PRINT("(incorrect)");
756 break;
757
758 case UNVERIFIED:
759 ND_PRINT("(unverified)");
760 break;
761 }
762 }
763 bp += 4;
764 len -= 4;
765
766 switch (PIM_TYPE(pim_typever)) {
767 case PIMV2_TYPE_HELLO:
768 {
769 uint16_t otype, olen;
770 while (len > 0) {
771 if (len < 4)
772 goto trunc;
773 ND_TCHECK_4(bp);
774 otype = EXTRACT_BE_U_2(bp);
775 olen = EXTRACT_BE_U_2(bp + 2);
776 ND_PRINT("\n\t %s Option (%u), length %u, Value: ",
777 tok2str(pimv2_hello_option_values, "Unknown", otype),
778 otype,
779 olen);
780 bp += 4;
781 len -= 4;
782
783 if (len < olen)
784 goto trunc;
785 ND_TCHECK_LEN(bp, olen);
786 switch (otype) {
787 case PIMV2_HELLO_OPTION_HOLDTIME:
788 if (olen != 2) {
789 ND_PRINT("ERROR: Option Length != 2 Bytes (%u)", olen);
790 } else {
791 unsigned_relts_print(ndo,
792 EXTRACT_BE_U_2(bp));
793 }
794 break;
795
796 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
797 if (olen != 4) {
798 ND_PRINT("ERROR: Option Length != 4 Bytes (%u)", olen);
799 } else {
800 char t_bit;
801 uint16_t lan_delay, override_interval;
802 lan_delay = EXTRACT_BE_U_2(bp);
803 override_interval = EXTRACT_BE_U_2(bp + 2);
804 t_bit = (lan_delay & 0x8000)? 1 : 0;
805 lan_delay &= ~0x8000;
806 ND_PRINT("\n\t T-bit=%u, LAN delay %ums, Override interval %ums",
807 t_bit, lan_delay, override_interval);
808 }
809 break;
810
811 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
812 case PIMV2_HELLO_OPTION_DR_PRIORITY:
813 switch (olen) {
814 case 0:
815 ND_PRINT("Bi-Directional Capability (Old)");
816 break;
817 case 4:
818 ND_PRINT("%u", EXTRACT_BE_U_4(bp));
819 break;
820 default:
821 ND_PRINT("ERROR: Option Length != 4 Bytes (%u)", olen);
822 break;
823 }
824 break;
825
826 case PIMV2_HELLO_OPTION_GENID:
827 if (olen != 4) {
828 ND_PRINT("ERROR: Option Length != 4 Bytes (%u)", olen);
829 } else {
830 ND_PRINT("0x%08x", EXTRACT_BE_U_4(bp));
831 }
832 break;
833
834 case PIMV2_HELLO_OPTION_REFRESH_CAP:
835 if (olen != 4) {
836 ND_PRINT("ERROR: Option Length != 4 Bytes (%u)", olen);
837 } else {
838 ND_PRINT("v%u", EXTRACT_U_1(bp));
839 if (EXTRACT_U_1(bp + 1) != 0) {
840 ND_PRINT(", interval ");
841 unsigned_relts_print(ndo,
842 EXTRACT_U_1(bp + 1));
843 }
844 if (EXTRACT_BE_U_2(bp + 2) != 0) {
845 ND_PRINT(" ?0x%04x?", EXTRACT_BE_U_2(bp + 2));
846 }
847 }
848 break;
849
850 case PIMV2_HELLO_OPTION_BIDIR_CAP:
851 break;
852
853 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
854 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
855 if (ndo->ndo_vflag > 1) {
856 const u_char *ptr = bp;
857 u_int plen = len;
858 while (ptr < (bp+olen)) {
859 ND_PRINT("\n\t ");
860 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
861 if (advance < 0)
862 goto trunc;
863 ptr += advance;
864 plen -= advance;
865 }
866 }
867 break;
868 default:
869 if (ndo->ndo_vflag <= 1)
870 print_unknown_data(ndo, bp, "\n\t ", olen);
871 break;
872 }
873 /* do we want to see an additionally hexdump ? */
874 if (ndo->ndo_vflag> 1)
875 print_unknown_data(ndo, bp, "\n\t ", olen);
876 bp += olen;
877 len -= olen;
878 }
879 break;
880 }
881
882 case PIMV2_TYPE_REGISTER:
883 {
884 const struct ip *ip;
885
886 if (len < 4)
887 goto trunc;
888 ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN);
889
890 ND_PRINT(", Flags [ %s ]\n\t",
891 tok2str(pimv2_register_flag_values,
892 "none",
893 EXTRACT_BE_U_4(bp)));
894
895 bp += 4; len -= 4;
896 /* encapsulated multicast packet */
897 if (len == 0)
898 goto trunc;
899 ip = (const struct ip *)bp;
900 ND_TCHECK_1(ip->ip_vhl);
901 switch (IP_V(ip)) {
902 case 0: /* Null header */
903 ND_TCHECK_4(ip->ip_dst);
904 ND_PRINT("IP-Null-header %s > %s",
905 ipaddr_string(ndo, ip->ip_src),
906 ipaddr_string(ndo, ip->ip_dst));
907 break;
908
909 case 4: /* IPv4 */
910 ip_print(ndo, bp, len);
911 break;
912
913 case 6: /* IPv6 */
914 ip6_print(ndo, bp, len);
915 break;
916
917 default:
918 ND_PRINT("IP ver %u", IP_V(ip));
919 break;
920 }
921 break;
922 }
923
924 case PIMV2_TYPE_REGISTER_STOP:
925 ND_PRINT(" group=");
926 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
927 goto trunc;
928 bp += advance; len -= advance;
929 ND_PRINT(" source=");
930 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
931 goto trunc;
932 bp += advance; len -= advance;
933 break;
934
935 case PIMV2_TYPE_JOIN_PRUNE:
936 case PIMV2_TYPE_GRAFT:
937 case PIMV2_TYPE_GRAFT_ACK:
938
939
940 /*
941 * 0 1 2 3
942 * 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
943 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
944 * |PIM Ver| Type | Addr length | Checksum |
945 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
946 * | Unicast-Upstream Neighbor Address |
947 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
948 * | Reserved | Num groups | Holdtime |
949 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
950 * | Encoded-Multicast Group Address-1 |
951 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
952 * | Number of Joined Sources | Number of Pruned Sources |
953 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
954 * | Encoded-Joined Source Address-1 |
955 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
956 * | . |
957 * | . |
958 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
959 * | Encoded-Joined Source Address-n |
960 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
961 * | Encoded-Pruned Source Address-1 |
962 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
963 * | . |
964 * | . |
965 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
966 * | Encoded-Pruned Source Address-n |
967 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
968 * | . |
969 * | . |
970 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
971 * | Encoded-Multicast Group Address-n |
972 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
973 */
974
975 {
976 uint8_t ngroup;
977 uint16_t holdtime;
978 uint16_t njoin;
979 uint16_t nprune;
980 u_int i, j;
981
982 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
983 ND_PRINT(", upstream-neighbor: ");
984 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
985 goto trunc;
986 bp += advance; len -= advance;
987 }
988 if (len < 4)
989 goto trunc;
990 ND_TCHECK_4(bp);
991 ngroup = EXTRACT_U_1(bp + 1);
992 holdtime = EXTRACT_BE_U_2(bp + 2);
993 ND_PRINT("\n\t %u group(s)", ngroup);
994 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
995 ND_PRINT(", holdtime: ");
996 if (holdtime == 0xffff)
997 ND_PRINT("infinite");
998 else
999 unsigned_relts_print(ndo, holdtime);
1000 }
1001 bp += 4; len -= 4;
1002 for (i = 0; i < ngroup; i++) {
1003 ND_PRINT("\n\t group #%u: ", i+1);
1004 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1005 goto trunc;
1006 bp += advance; len -= advance;
1007 if (len < 4)
1008 goto trunc;
1009 ND_TCHECK_4(bp);
1010 njoin = EXTRACT_BE_U_2(bp);
1011 nprune = EXTRACT_BE_U_2(bp + 2);
1012 ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune);
1013 bp += 4; len -= 4;
1014 for (j = 0; j < njoin; j++) {
1015 ND_PRINT("\n\t joined source #%u: ", j+1);
1016 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1017 goto trunc;
1018 bp += advance; len -= advance;
1019 }
1020 for (j = 0; j < nprune; j++) {
1021 ND_PRINT("\n\t pruned source #%u: ", j+1);
1022 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1023 goto trunc;
1024 bp += advance; len -= advance;
1025 }
1026 }
1027 break;
1028 }
1029
1030 case PIMV2_TYPE_BOOTSTRAP:
1031 {
1032 u_int i, j, frpcnt;
1033
1034 /* Fragment Tag, Hash Mask len, and BSR-priority */
1035 if (len < 2)
1036 goto trunc;
1037 ND_TCHECK_2(bp);
1038 ND_PRINT(" tag=%x", EXTRACT_BE_U_2(bp));
1039 bp += 2;
1040 len -= 2;
1041 if (len < 1)
1042 goto trunc;
1043 ND_TCHECK_1(bp);
1044 ND_PRINT(" hashmlen=%u", EXTRACT_U_1(bp));
1045 if (len < 2)
1046 goto trunc;
1047 ND_TCHECK_1(bp + 2);
1048 ND_PRINT(" BSRprio=%u", EXTRACT_U_1(bp + 1));
1049 bp += 2;
1050 len -= 2;
1051
1052 /* Encoded-Unicast-BSR-Address */
1053 ND_PRINT(" BSR=");
1054 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1055 goto trunc;
1056 bp += advance;
1057 len -= advance;
1058
1059 for (i = 0; len > 0; i++) {
1060 /* Encoded-Group Address */
1061 ND_PRINT(" (group%u: ", i);
1062 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1063 goto trunc;
1064 bp += advance;
1065 len -= advance;
1066
1067 /* RP-Count, Frag RP-Cnt, and rsvd */
1068 if (len < 1)
1069 goto trunc;
1070 ND_TCHECK_1(bp);
1071 ND_PRINT(" RPcnt=%u", EXTRACT_U_1(bp));
1072 if (len < 2)
1073 goto trunc;
1074 ND_TCHECK_1(bp + 1);
1075 frpcnt = EXTRACT_U_1(bp + 1);
1076 ND_PRINT(" FRPcnt=%u", frpcnt);
1077 if (len < 4)
1078 goto trunc;
1079 bp += 4;
1080 len -= 4;
1081
1082 for (j = 0; j < frpcnt && len > 0; j++) {
1083 /* each RP info */
1084 ND_PRINT(" RP%u=", j);
1085 if ((advance = pimv2_addr_print(ndo, bp, len,
1086 pimv2_unicast,
1087 pimv2_addr_len,
1088 0)) < 0)
1089 goto trunc;
1090 bp += advance;
1091 len -= advance;
1092
1093 if (len < 2)
1094 goto trunc;
1095 ND_TCHECK_2(bp);
1096 ND_PRINT(",holdtime=");
1097 unsigned_relts_print(ndo,
1098 EXTRACT_BE_U_2(bp));
1099 if (len < 3)
1100 goto trunc;
1101 ND_TCHECK_1(bp + 2);
1102 ND_PRINT(",prio=%u", EXTRACT_U_1(bp + 2));
1103 if (len < 4)
1104 goto trunc;
1105 bp += 4;
1106 len -= 4;
1107 }
1108 ND_PRINT(")");
1109 }
1110 break;
1111 }
1112 case PIMV2_TYPE_ASSERT:
1113 ND_PRINT(" group=");
1114 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1115 goto trunc;
1116 bp += advance; len -= advance;
1117 ND_PRINT(" src=");
1118 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1119 goto trunc;
1120 bp += advance; len -= advance;
1121 if (len < 8)
1122 goto trunc;
1123 ND_TCHECK_8(bp);
1124 if (EXTRACT_U_1(bp) & 0x80)
1125 ND_PRINT(" RPT");
1126 ND_PRINT(" pref=%u", EXTRACT_BE_U_4(bp) & 0x7fffffff);
1127 ND_PRINT(" metric=%u", EXTRACT_BE_U_4(bp + 4));
1128 break;
1129
1130 case PIMV2_TYPE_CANDIDATE_RP:
1131 {
1132 u_int i, pfxcnt;
1133
1134 /* Prefix-Cnt, Priority, and Holdtime */
1135 if (len < 1)
1136 goto trunc;
1137 ND_TCHECK_1(bp);
1138 ND_PRINT(" prefix-cnt=%u", EXTRACT_U_1(bp));
1139 pfxcnt = EXTRACT_U_1(bp);
1140 if (len < 2)
1141 goto trunc;
1142 ND_TCHECK_1(bp + 1);
1143 ND_PRINT(" prio=%u", EXTRACT_U_1(bp + 1));
1144 if (len < 4)
1145 goto trunc;
1146 ND_TCHECK_2(bp + 2);
1147 ND_PRINT(" holdtime=");
1148 unsigned_relts_print(ndo, EXTRACT_BE_U_2(bp + 2));
1149 bp += 4;
1150 len -= 4;
1151
1152 /* Encoded-Unicast-RP-Address */
1153 ND_PRINT(" RP=");
1154 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1155 goto trunc;
1156 bp += advance;
1157 len -= advance;
1158
1159 /* Encoded-Group Addresses */
1160 for (i = 0; i < pfxcnt && len > 0; i++) {
1161 ND_PRINT(" Group%u=", i);
1162 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1163 goto trunc;
1164 bp += advance;
1165 len -= advance;
1166 }
1167 break;
1168 }
1169
1170 case PIMV2_TYPE_PRUNE_REFRESH:
1171 ND_PRINT(" src=");
1172 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1173 goto trunc;
1174 bp += advance;
1175 len -= advance;
1176 ND_PRINT(" grp=");
1177 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1178 goto trunc;
1179 bp += advance;
1180 len -= advance;
1181 ND_PRINT(" forwarder=");
1182 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1183 goto trunc;
1184 bp += advance;
1185 len -= advance;
1186 if (len < 2)
1187 goto trunc;
1188 ND_TCHECK_2(bp);
1189 ND_PRINT(" TUNR ");
1190 unsigned_relts_print(ndo, EXTRACT_BE_U_2(bp));
1191 break;
1192
1193
1194 default:
1195 ND_PRINT(" [type %u]", PIM_TYPE(pim_typever));
1196 break;
1197 }
1198
1199 return;
1200
1201 trunc:
1202 nd_print_trunc(ndo);
1203 }
[mirror] the TCPdump network dissector