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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 #include "af.h"
38
39 #define PIMV1_TYPE_QUERY 0
40 #define PIMV1_TYPE_REGISTER 1
41 #define PIMV1_TYPE_REGISTER_STOP 2
42 #define PIMV1_TYPE_JOIN_PRUNE 3
43 #define PIMV1_TYPE_RP_REACHABILITY 4
44 #define PIMV1_TYPE_ASSERT 5
45 #define PIMV1_TYPE_GRAFT 6
46 #define PIMV1_TYPE_GRAFT_ACK 7
47
48 static const struct tok pimv1_type_str[] = {
49 { PIMV1_TYPE_QUERY, "Query" },
50 { PIMV1_TYPE_REGISTER, "Register" },
51 { PIMV1_TYPE_REGISTER_STOP, "Register-Stop" },
52 { PIMV1_TYPE_JOIN_PRUNE, "Join/Prune" },
53 { PIMV1_TYPE_RP_REACHABILITY, "RP-reachable" },
54 { PIMV1_TYPE_ASSERT, "Assert" },
55 { PIMV1_TYPE_GRAFT, "Graft" },
56 { PIMV1_TYPE_GRAFT_ACK, "Graft-ACK" },
57 { 0, NULL }
58 };
59
60 #define PIMV2_TYPE_HELLO 0
61 #define PIMV2_TYPE_REGISTER 1
62 #define PIMV2_TYPE_REGISTER_STOP 2
63 #define PIMV2_TYPE_JOIN_PRUNE 3
64 #define PIMV2_TYPE_BOOTSTRAP 4
65 #define PIMV2_TYPE_ASSERT 5
66 #define PIMV2_TYPE_GRAFT 6
67 #define PIMV2_TYPE_GRAFT_ACK 7
68 #define PIMV2_TYPE_CANDIDATE_RP 8
69 #define PIMV2_TYPE_PRUNE_REFRESH 9
70 #define PIMV2_TYPE_DF_ELECTION 10
71 #define PIMV2_TYPE_ECMP_REDIRECT 11
72
73 static const struct tok pimv2_type_values[] = {
74 { PIMV2_TYPE_HELLO, "Hello" },
75 { PIMV2_TYPE_REGISTER, "Register" },
76 { PIMV2_TYPE_REGISTER_STOP, "Register Stop" },
77 { PIMV2_TYPE_JOIN_PRUNE, "Join / Prune" },
78 { PIMV2_TYPE_BOOTSTRAP, "Bootstrap" },
79 { PIMV2_TYPE_ASSERT, "Assert" },
80 { PIMV2_TYPE_GRAFT, "Graft" },
81 { PIMV2_TYPE_GRAFT_ACK, "Graft Acknowledgement" },
82 { PIMV2_TYPE_CANDIDATE_RP, "Candidate RP Advertisement" },
83 { PIMV2_TYPE_PRUNE_REFRESH, "Prune Refresh" },
84 { PIMV2_TYPE_DF_ELECTION, "DF Election" },
85 { PIMV2_TYPE_ECMP_REDIRECT, "ECMP Redirect" },
86 { 0, NULL}
87 };
88
89 #define PIMV2_HELLO_OPTION_HOLDTIME 1
90 #define PIMV2_HELLO_OPTION_LANPRUNEDELAY 2
91 #define PIMV2_HELLO_OPTION_DR_PRIORITY_OLD 18
92 #define PIMV2_HELLO_OPTION_DR_PRIORITY 19
93 #define PIMV2_HELLO_OPTION_GENID 20
94 #define PIMV2_HELLO_OPTION_REFRESH_CAP 21
95 #define PIMV2_HELLO_OPTION_BIDIR_CAP 22
96 #define PIMV2_HELLO_OPTION_ADDRESS_LIST 24
97 #define PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD 65001
98
99 static const struct tok pimv2_hello_option_values[] = {
100 { PIMV2_HELLO_OPTION_HOLDTIME, "Hold Time" },
101 { PIMV2_HELLO_OPTION_LANPRUNEDELAY, "LAN Prune Delay" },
102 { PIMV2_HELLO_OPTION_DR_PRIORITY_OLD, "DR Priority (Old)" },
103 { PIMV2_HELLO_OPTION_DR_PRIORITY, "DR Priority" },
104 { PIMV2_HELLO_OPTION_GENID, "Generation ID" },
105 { PIMV2_HELLO_OPTION_REFRESH_CAP, "State Refresh Capability" },
106 { PIMV2_HELLO_OPTION_BIDIR_CAP, "Bi-Directional Capability" },
107 { PIMV2_HELLO_OPTION_ADDRESS_LIST, "Address List" },
108 { PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD, "Address List (Old)" },
109 { 0, NULL}
110 };
111
112 #define PIMV2_REGISTER_FLAG_LEN 4
113 #define PIMV2_REGISTER_FLAG_BORDER 0x80000000
114 #define PIMV2_REGISTER_FLAG_NULL 0x40000000
115
116 static const struct tok pimv2_register_flag_values[] = {
117 { PIMV2_REGISTER_FLAG_BORDER, "Border" },
118 { PIMV2_REGISTER_FLAG_NULL, "Null" },
119 { 0, NULL}
120 };
121
122 #define PIMV2_DF_ELECTION_OFFER 1
123 #define PIMV2_DF_ELECTION_WINNER 2
124 #define PIMV2_DF_ELECTION_BACKOFF 3
125 #define PIMV2_DF_ELECTION_PASS 4
126
127 static const struct tok pimv2_df_election_flag_values[] = {
128 { PIMV2_DF_ELECTION_OFFER, "Offer" },
129 { PIMV2_DF_ELECTION_WINNER, "Winner" },
130 { PIMV2_DF_ELECTION_BACKOFF, "Backoff" },
131 { PIMV2_DF_ELECTION_PASS, "Pass" },
132 { 0, NULL}
133 };
134
135 #define PIMV2_DF_ELECTION_PASS_BACKOFF_STR(x) ( \
136 x == PIMV2_DF_ELECTION_BACKOFF ? "offer" : "new winner" )
137
138
139 /*
140 * XXX: We consider a case where IPv6 is not ready yet for portability,
141 * but PIM dependent definitions should be independent of IPv6...
142 */
143
144 struct pim {
145 nd_uint8_t pim_typever;
146 /* upper 4bit: PIM version number; 2 for PIMv2 */
147 /* lower 4bit: the PIM message type, currently they are:
148 * Hello, Register, Register-Stop, Join/Prune,
149 * Bootstrap, Assert, Graft (PIM-DM only),
150 * Graft-Ack (PIM-DM only), C-RP-Adv
151 */
152 #define PIM_VER(x) (((x) & 0xf0) >> 4)
153 #define PIM_TYPE(x) ((x) & 0x0f)
154 nd_uint8_t pim_rsv; /* Reserved in v1, subtype+address length in v2 */
155 #define PIM_SUBTYPE(x) (((x) & 0xf0) >> 4)
156 nd_uint16_t pim_cksum; /* IP style check sum */
157 };
158
159 static void pimv2_print(netdissect_options *, const u_char *bp, u_int len, const u_char *);
160
161 static void
162 pimv1_join_prune_print(netdissect_options *ndo,
163 const u_char *bp, u_int len)
164 {
165 u_int ngroups, njoin, nprune;
166 u_int njp;
167
168 /* If it's a single group and a single source, use 1-line output. */
169 if (ND_TTEST_LEN(bp, 30) && GET_U_1(bp + 11) == 1 &&
170 ((njoin = GET_BE_U_2(bp + 20)) + GET_BE_U_2(bp + 22)) == 1) {
171 u_int hold;
172
173 ND_PRINT(" RPF %s ", GET_IPADDR_STRING(bp));
174 hold = GET_BE_U_2(bp + 6);
175 if (hold != 180) {
176 ND_PRINT("Hold ");
177 unsigned_relts_print(ndo, hold);
178 }
179 ND_PRINT("%s (%s/%u, %s", njoin ? "Join" : "Prune",
180 GET_IPADDR_STRING(bp + 26), GET_U_1(bp + 25) & 0x3f,
181 GET_IPADDR_STRING(bp + 12));
182 if (GET_BE_U_4(bp + 16) != 0xffffffff)
183 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 16));
184 ND_PRINT(") %s%s %s",
185 (GET_U_1(bp + 24) & 0x01) ? "Sparse" : "Dense",
186 (GET_U_1(bp + 25) & 0x80) ? " WC" : "",
187 (GET_U_1(bp + 25) & 0x40) ? "RP" : "SPT");
188 return;
189 }
190
191 if (len < sizeof(nd_ipv4))
192 goto trunc;
193 if (ndo->ndo_vflag > 1)
194 ND_PRINT("\n");
195 ND_PRINT(" Upstream Nbr: %s", GET_IPADDR_STRING(bp));
196 bp += 4;
197 len -= 4;
198 if (len < 4)
199 goto trunc;
200 if (ndo->ndo_vflag > 1)
201 ND_PRINT("\n");
202 ND_PRINT(" Hold time: ");
203 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
204 if (ndo->ndo_vflag < 2)
205 return;
206 bp += 4;
207 len -= 4;
208
209 if (len < 4)
210 goto trunc;
211 ngroups = GET_U_1(bp + 3);
212 bp += 4;
213 len -= 4;
214 while (ngroups != 0) {
215 /*
216 * XXX - does the address have length "addrlen" and the
217 * mask length "maddrlen"?
218 */
219 if (len < 4)
220 goto trunc;
221 ND_PRINT("\n\tGroup: %s", GET_IPADDR_STRING(bp));
222 bp += 4;
223 len -= 4;
224 if (len < 4)
225 goto trunc;
226 if (GET_BE_U_4(bp) != 0xffffffff)
227 ND_PRINT("/%s", GET_IPADDR_STRING(bp));
228 bp += 4;
229 len -= 4;
230 if (len < 4)
231 goto trunc;
232 njoin = GET_BE_U_2(bp);
233 nprune = GET_BE_U_2(bp + 2);
234 ND_PRINT(" joined: %u pruned: %u", njoin, nprune);
235 bp += 4;
236 len -= 4;
237 for (njp = 0; njp < (njoin + nprune); njp++) {
238 const char *type;
239
240 if (njp < njoin)
241 type = "Join ";
242 else
243 type = "Prune";
244 if (len < 6)
245 goto trunc;
246 ND_PRINT("\n\t%s %s%s%s%s/%u", type,
247 (GET_U_1(bp) & 0x01) ? "Sparse " : "Dense ",
248 (GET_U_1(bp + 1) & 0x80) ? "WC " : "",
249 (GET_U_1(bp + 1) & 0x40) ? "RP " : "SPT ",
250 GET_IPADDR_STRING(bp + 2),
251 GET_U_1(bp + 1) & 0x3f);
252 bp += 6;
253 len -= 6;
254 }
255 ngroups--;
256 }
257 return;
258 trunc:
259 nd_print_trunc(ndo);
260 }
261
262 void
263 pimv1_print(netdissect_options *ndo,
264 const u_char *bp, u_int len)
265 {
266 u_char type;
267
268 ndo->ndo_protocol = "pimv1";
269 type = GET_U_1(bp + 1);
270
271 ND_PRINT(" %s", tok2str(pimv1_type_str, "[type %u]", type));
272 switch (type) {
273 case PIMV1_TYPE_QUERY:
274 if (ND_TTEST_1(bp + 8)) {
275 switch (GET_U_1(bp + 8) >> 4) {
276 case 0:
277 ND_PRINT(" Dense-mode");
278 break;
279 case 1:
280 ND_PRINT(" Sparse-mode");
281 break;
282 case 2:
283 ND_PRINT(" Sparse-Dense-mode");
284 break;
285 default:
286 ND_PRINT(" mode-%u", GET_U_1(bp + 8) >> 4);
287 break;
288 }
289 }
290 if (ndo->ndo_vflag) {
291 ND_PRINT(" (Hold-time ");
292 unsigned_relts_print(ndo, GET_BE_U_2(bp + 10));
293 ND_PRINT(")");
294 }
295 break;
296
297 case PIMV1_TYPE_REGISTER:
298 ND_TCHECK_LEN(bp + 8, 20); /* ip header */
299 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 20),
300 GET_IPADDR_STRING(bp + 24));
301 break;
302 case PIMV1_TYPE_REGISTER_STOP:
303 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 8),
304 GET_IPADDR_STRING(bp + 12));
305 break;
306 case PIMV1_TYPE_RP_REACHABILITY:
307 if (ndo->ndo_vflag) {
308 ND_PRINT(" group %s", GET_IPADDR_STRING(bp + 8));
309 if (GET_BE_U_4(bp + 12) != 0xffffffff)
310 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
311 ND_PRINT(" RP %s hold ", GET_IPADDR_STRING(bp + 16));
312 unsigned_relts_print(ndo, GET_BE_U_2(bp + 22));
313 }
314 break;
315 case PIMV1_TYPE_ASSERT:
316 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 16),
317 GET_IPADDR_STRING(bp + 8));
318 if (GET_BE_U_4(bp + 12) != 0xffffffff)
319 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
320 ND_PRINT(" %s pref %u metric %u",
321 (GET_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT",
322 GET_BE_U_4(bp + 20) & 0x7fffffff,
323 GET_BE_U_4(bp + 24));
324 break;
325 case PIMV1_TYPE_JOIN_PRUNE:
326 case PIMV1_TYPE_GRAFT:
327 case PIMV1_TYPE_GRAFT_ACK:
328 if (ndo->ndo_vflag) {
329 if (len < 8)
330 goto trunc;
331 pimv1_join_prune_print(ndo, bp + 8, len - 8);
332 }
333 break;
334 }
335 if ((GET_U_1(bp + 4) >> 4) != 1)
336 ND_PRINT(" [v%u]", GET_U_1(bp + 4) >> 4);
337 return;
338
339 trunc:
340 nd_print_trunc(ndo);
341 }
342
343 /*
344 * auto-RP is a cisco protocol, documented at
345 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
346 *
347 * This implements version 1+, dated Sept 9, 1998.
348 */
349 void
350 cisco_autorp_print(netdissect_options *ndo,
351 const u_char *bp, u_int len)
352 {
353 u_int type;
354 u_int numrps;
355 u_int hold;
356
357 ndo->ndo_protocol = "cisco_autorp";
358 if (len < 8)
359 goto trunc;
360 ND_PRINT(" auto-rp ");
361 type = GET_U_1(bp);
362 switch (type) {
363 case 0x11:
364 ND_PRINT("candidate-advert");
365 break;
366 case 0x12:
367 ND_PRINT("mapping");
368 break;
369 default:
370 ND_PRINT("type-0x%02x", type);
371 break;
372 }
373
374 numrps = GET_U_1(bp + 1);
375
376 ND_PRINT(" Hold ");
377 hold = GET_BE_U_2(bp + 2);
378 if (hold)
379 unsigned_relts_print(ndo, GET_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_PRINT(" RP %s", GET_IPADDR_STRING(bp));
407 bp += 4;
408 len -= 4;
409 if (len < 1)
410 goto trunc;
411 switch (GET_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 (GET_U_1(bp) & 0xfc)
422 ND_PRINT(" [rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
423 bp += 1;
424 len -= 1;
425 if (len < 1)
426 goto trunc;
427 nentries = GET_U_1(bp);
428 bp += 1;
429 len -= 1;
430 s = ' ';
431 while (nentries != 0) {
432 if (len < 6)
433 goto trunc;
434 ND_PRINT("%c%s%s/%u", s, GET_U_1(bp) & 1 ? "!" : "",
435 GET_IPADDR_STRING(bp + 2), GET_U_1(bp + 1));
436 if (GET_U_1(bp) & 0x02) {
437 ND_PRINT(" bidir");
438 }
439 if (GET_U_1(bp) & 0xfc) {
440 ND_PRINT("[rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
441 }
442 s = ',';
443 bp += 6; len -= 6;
444 nentries--;
445 }
446 numrps--;
447 }
448 return;
449
450 trunc:
451 nd_print_trunc(ndo);
452 }
453
454 void
455 pim_print(netdissect_options *ndo,
456 const u_char *bp, u_int len, const u_char *bp2)
457 {
458 const struct pim *pim = (const struct pim *)bp;
459 uint8_t pim_typever;
460
461 ndo->ndo_protocol = "pim";
462
463 pim_typever = GET_U_1(pim->pim_typever);
464 switch (PIM_VER(pim_typever)) {
465 case 2:
466 if (!ndo->ndo_vflag) {
467 ND_PRINT("PIMv%u, %s, length %u",
468 PIM_VER(pim_typever),
469 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)),
470 len);
471 return;
472 } else {
473 ND_PRINT("PIMv%u, length %u\n\t%s",
474 PIM_VER(pim_typever),
475 len,
476 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)));
477 pimv2_print(ndo, bp, len, bp2);
478 }
479 break;
480 default:
481 ND_PRINT("PIMv%u, length %u",
482 PIM_VER(pim_typever),
483 len);
484 break;
485 }
486 }
487
488 /*
489 * PIMv2 uses encoded address representations.
490 *
491 * The last PIM-SM I-D before RFC2117 was published specified the
492 * following representation for unicast addresses. However, RFC2117
493 * specified no encoding for unicast addresses with the unicast
494 * address length specified in the header. Therefore, we have to
495 * guess which encoding is being used (Cisco's PIMv2 implementation
496 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
497 * field into a 'unicast-address-length-in-bytes' field. We guess
498 * that it's the draft encoding if this reserved field is zero.
499 *
500 * RFC2362 goes back to the encoded format, and calls the addr length
501 * field "reserved" again.
502 *
503 * The first byte is the address family, from:
504 *
505 * 0 Reserved
506 * 1 IP (IP version 4)
507 * 2 IP6 (IP version 6)
508 * 3 NSAP
509 * 4 HDLC (8-bit multidrop)
510 * 5 BBN 1822
511 * 6 802 (includes all 802 media plus Ethernet "canonical format")
512 * 7 E.163
513 * 8 E.164 (SMDS, Frame Relay, ATM)
514 * 9 F.69 (Telex)
515 * 10 X.121 (X.25, Frame Relay)
516 * 11 IPX
517 * 12 Appletalk
518 * 13 Decnet IV
519 * 14 Banyan Vines
520 * 15 E.164 with NSAP format subaddress
521 *
522 * In addition, the second byte is an "Encoding". 0 is the default
523 * encoding for the address family, and no other encodings are currently
524 * specified.
525 *
526 */
527
528 enum pimv2_addrtype {
529 pimv2_unicast, pimv2_group, pimv2_source
530 };
531
532 /* 0 1 2 3
533 * 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
534 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
535 * | Addr Family | Encoding Type | Unicast Address |
536 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
537 * 0 1 2 3
538 * 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
539 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
540 * | Addr Family | Encoding Type | Reserved | Mask Len |
541 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
542 * | Group multicast Address |
543 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
544 * 0 1 2 3
545 * 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
546 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
547 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
548 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
549 * | Source Address |
550 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
551 */
552 static int
553 pimv2_addr_print(netdissect_options *ndo,
554 const u_char *bp, u_int len, enum pimv2_addrtype at,
555 u_int addr_len, int silent)
556 {
557 u_int af;
558 int hdrlen;
559
560 if (addr_len == 0) {
561 if (len < 2)
562 goto trunc;
563 af = GET_U_1(bp);
564 switch (af) {
565 case AFNUM_IP:
566 addr_len = (u_int)sizeof(nd_ipv4);
567 break;
568 case AFNUM_IP6:
569 addr_len = (u_int)sizeof(nd_ipv6);
570 break;
571 default:
572 return -1;
573 }
574 if (GET_U_1(bp + 1) != 0)
575 return -1;
576 hdrlen = 2;
577 } else {
578 switch (addr_len) {
579 case sizeof(nd_ipv4):
580 af = AFNUM_IP;
581 break;
582 case sizeof(nd_ipv6):
583 af = AFNUM_IP6;
584 break;
585 default:
586 return -1;
587 break;
588 }
589 hdrlen = 0;
590 }
591
592 bp += hdrlen;
593 len -= hdrlen;
594 switch (at) {
595 case pimv2_unicast:
596 if (len < addr_len)
597 goto trunc;
598 ND_TCHECK_LEN(bp, addr_len);
599 if (af == AFNUM_IP) {
600 if (!silent)
601 ND_PRINT("%s", GET_IPADDR_STRING(bp));
602 }
603 else if (af == AFNUM_IP6) {
604 if (!silent)
605 ND_PRINT("%s", GET_IP6ADDR_STRING(bp));
606 }
607 return hdrlen + addr_len;
608 case pimv2_group:
609 case pimv2_source:
610 if (len < addr_len + 2)
611 goto trunc;
612 ND_TCHECK_LEN(bp, addr_len + 2);
613 if (af == AFNUM_IP) {
614 if (!silent) {
615 ND_PRINT("%s", GET_IPADDR_STRING(bp + 2));
616 if (GET_U_1(bp + 1) != 32)
617 ND_PRINT("/%u", GET_U_1(bp + 1));
618 }
619 }
620 else if (af == AFNUM_IP6) {
621 if (!silent) {
622 ND_PRINT("%s", GET_IP6ADDR_STRING(bp + 2));
623 if (GET_U_1(bp + 1) != 128)
624 ND_PRINT("/%u", GET_U_1(bp + 1));
625 }
626 }
627 if (GET_U_1(bp) && !silent) {
628 if (at == pimv2_group) {
629 ND_PRINT("(0x%02x)", GET_U_1(bp));
630 } else {
631 ND_PRINT("(%s%s%s",
632 GET_U_1(bp) & 0x04 ? "S" : "",
633 GET_U_1(bp) & 0x02 ? "W" : "",
634 GET_U_1(bp) & 0x01 ? "R" : "");
635 if (GET_U_1(bp) & 0xf8) {
636 ND_PRINT("+0x%02x",
637 GET_U_1(bp) & 0xf8);
638 }
639 ND_PRINT(")");
640 }
641 }
642 return hdrlen + 2 + addr_len;
643 default:
644 return -1;
645 }
646 trunc:
647 return -1;
648 }
649
650 enum checksum_status {
651 CORRECT,
652 INCORRECT,
653 UNVERIFIED
654 };
655
656 static enum checksum_status
657 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
658 const u_char *bp2, u_int len)
659 {
660 const struct ip *ip;
661 u_int cksum;
662
663 if (!ND_TTEST_LEN(bp, len)) {
664 /* We don't have all the data. */
665 return (UNVERIFIED);
666 }
667 ip = (const struct ip *)bp2;
668 if (IP_V(ip) == 4) {
669 struct cksum_vec vec[1];
670
671 vec[0].ptr = bp;
672 vec[0].len = len;
673 cksum = in_cksum(vec, 1);
674 return (cksum ? INCORRECT : CORRECT);
675 } else if (IP_V(ip) == 6) {
676 const struct ip6_hdr *ip6;
677
678 ip6 = (const struct ip6_hdr *)bp2;
679 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
680 return (cksum ? INCORRECT : CORRECT);
681 } else {
682 return (UNVERIFIED);
683 }
684 }
685
686 static void
687 pimv2_print(netdissect_options *ndo,
688 const u_char *bp, u_int len, const u_char *bp2)
689 {
690 const struct pim *pim = (const struct pim *)bp;
691 int advance;
692 int subtype;
693 enum checksum_status cksum_status;
694 u_int pim_typever;
695 u_int pimv2_addr_len;
696
697 ndo->ndo_protocol = "pimv2";
698 if (len < 2) {
699 ND_PRINT("[length %u < 2]", len);
700 nd_print_invalid(ndo);
701 return;
702 }
703 pim_typever = GET_U_1(pim->pim_typever);
704 /* RFC5015 allocates the high 4 bits of pim_rsv for "subtype". */
705 pimv2_addr_len = GET_U_1(pim->pim_rsv) & 0x0f;
706 if (pimv2_addr_len != 0)
707 ND_PRINT(", RFC2117-encoding");
708
709 if (len < 4) {
710 ND_PRINT("[length %u < 4]", len);
711 nd_print_invalid(ndo);
712 return;
713 }
714 ND_PRINT(", cksum 0x%04x ", GET_BE_U_2(pim->pim_cksum));
715 if (GET_BE_U_2(pim->pim_cksum) == 0) {
716 ND_PRINT("(unverified)");
717 } else {
718 if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) {
719 /*
720 * The checksum only covers the packet header,
721 * not the encapsulated packet.
722 */
723 cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
724 if (cksum_status == INCORRECT) {
725 /*
726 * To quote RFC 4601, "For interoperability
727 * reasons, a message carrying a checksum
728 * calculated over the entire PIM Register
729 * message should also be accepted."
730 */
731 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
732 }
733 } else {
734 /*
735 * The checksum covers the entire packet.
736 */
737 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
738 }
739 switch (cksum_status) {
740
741 case CORRECT:
742 ND_PRINT("(correct)");
743 break;
744
745 case INCORRECT:
746 ND_PRINT("(incorrect)");
747 break;
748
749 case UNVERIFIED:
750 ND_PRINT("(unverified)");
751 break;
752 }
753 }
754 bp += 4;
755 len -= 4;
756
757 switch (PIM_TYPE(pim_typever)) {
758 case PIMV2_TYPE_HELLO:
759 {
760 uint16_t otype, olen;
761 while (len > 0) {
762 if (len < 4)
763 goto trunc;
764 otype = GET_BE_U_2(bp);
765 olen = GET_BE_U_2(bp + 2);
766 ND_PRINT("\n\t %s Option (%u), length %u, Value: ",
767 tok2str(pimv2_hello_option_values, "Unknown", otype),
768 otype,
769 olen);
770 bp += 4;
771 len -= 4;
772
773 if (len < olen)
774 goto trunc;
775 ND_TCHECK_LEN(bp, olen);
776 switch (otype) {
777 case PIMV2_HELLO_OPTION_HOLDTIME:
778 if (olen != 2) {
779 ND_PRINT("[option length %u != 2]", olen);
780 nd_print_invalid(ndo);
781 return;
782 } else {
783 unsigned_relts_print(ndo,
784 GET_BE_U_2(bp));
785 }
786 break;
787
788 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
789 if (olen != 4) {
790 ND_PRINT("[option length %u != 4]", olen);
791 nd_print_invalid(ndo);
792 return;
793 } else {
794 char t_bit;
795 uint16_t lan_delay, override_interval;
796 lan_delay = GET_BE_U_2(bp);
797 override_interval = GET_BE_U_2(bp + 2);
798 t_bit = (lan_delay & 0x8000)? 1 : 0;
799 lan_delay &= ~0x8000;
800 ND_PRINT("\n\t T-bit=%u, LAN delay %ums, Override interval %ums",
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("Bi-Directional Capability (Old)");
810 break;
811 case 4:
812 ND_PRINT("%u", GET_BE_U_4(bp));
813 break;
814 default:
815 ND_PRINT("[option length %u != 4]", olen);
816 nd_print_invalid(ndo);
817 return;
818 break;
819 }
820 break;
821
822 case PIMV2_HELLO_OPTION_GENID:
823 if (olen != 4) {
824 ND_PRINT("[option length %u != 4]", olen);
825 nd_print_invalid(ndo);
826 return;
827 } else {
828 ND_PRINT("0x%08x", GET_BE_U_4(bp));
829 }
830 break;
831
832 case PIMV2_HELLO_OPTION_REFRESH_CAP:
833 if (olen != 4) {
834 ND_PRINT("[option length %u != 4]", olen);
835 nd_print_invalid(ndo);
836 return;
837 } else {
838 ND_PRINT("v%u", GET_U_1(bp));
839 if (GET_U_1(bp + 1) != 0) {
840 ND_PRINT(", interval ");
841 unsigned_relts_print(ndo,
842 GET_U_1(bp + 1));
843 }
844 if (GET_BE_U_2(bp + 2) != 0) {
845 ND_PRINT(" ?0x%04x?",
846 GET_BE_U_2(bp + 2));
847 }
848 }
849 break;
850
851 case PIMV2_HELLO_OPTION_BIDIR_CAP:
852 break;
853
854 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
855 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
856 if (ndo->ndo_vflag > 1) {
857 const u_char *ptr = bp;
858 u_int plen = len;
859 while (ptr < (bp+olen)) {
860 ND_PRINT("\n\t ");
861 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
862 if (advance < 0)
863 goto trunc;
864 ptr += advance;
865 plen -= advance;
866 }
867 }
868 break;
869 default:
870 if (ndo->ndo_vflag <= 1)
871 print_unknown_data(ndo, bp, "\n\t ", olen);
872 break;
873 }
874 /* do we want to see an additionally hexdump ? */
875 if (ndo->ndo_vflag> 1)
876 print_unknown_data(ndo, bp, "\n\t ", olen);
877 bp += olen;
878 len -= olen;
879 }
880 break;
881 }
882
883 case PIMV2_TYPE_REGISTER:
884 {
885 const struct ip *ip;
886
887 if (len < 4)
888 goto trunc;
889 ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN);
890
891 ND_PRINT(", Flags [ %s ]\n\t",
892 tok2str(pimv2_register_flag_values,
893 "none",
894 GET_BE_U_4(bp)));
895
896 bp += 4; len -= 4;
897 /* encapsulated multicast packet */
898 if (len == 0)
899 goto trunc;
900 ip = (const struct ip *)bp;
901 switch (IP_V(ip)) {
902 case 0: /* Null header */
903 ND_PRINT("IP-Null-header %s > %s",
904 GET_IPADDR_STRING(ip->ip_src),
905 GET_IPADDR_STRING(ip->ip_dst));
906 break;
907
908 case 4: /* IPv4 */
909 ip_print(ndo, bp, len);
910 break;
911
912 case 6: /* IPv6 */
913 ip6_print(ndo, bp, len);
914 break;
915
916 default:
917 ND_PRINT("IP ver %u", IP_V(ip));
918 break;
919 }
920 break;
921 }
922
923 case PIMV2_TYPE_REGISTER_STOP:
924 ND_PRINT(" group=");
925 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
926 goto trunc;
927 bp += advance; len -= advance;
928 ND_PRINT(" source=");
929 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
930 goto trunc;
931 bp += advance; len -= advance;
932 break;
933
934 case PIMV2_TYPE_JOIN_PRUNE:
935 case PIMV2_TYPE_GRAFT:
936 case PIMV2_TYPE_GRAFT_ACK:
937
938
939 /*
940 * 0 1 2 3
941 * 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
942 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
943 * |PIM Ver| Type | Addr length | Checksum |
944 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
945 * | Unicast-Upstream Neighbor Address |
946 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
947 * | Reserved | Num groups | Holdtime |
948 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
949 * | Encoded-Multicast Group Address-1 |
950 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
951 * | Number of Joined Sources | Number of Pruned Sources |
952 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
953 * | Encoded-Joined Source Address-1 |
954 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
955 * | . |
956 * | . |
957 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
958 * | Encoded-Joined Source Address-n |
959 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
960 * | Encoded-Pruned Source Address-1 |
961 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
962 * | . |
963 * | . |
964 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
965 * | Encoded-Pruned Source Address-n |
966 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
967 * | . |
968 * | . |
969 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
970 * | Encoded-Multicast Group Address-n |
971 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
972 */
973
974 {
975 uint8_t ngroup;
976 uint16_t holdtime;
977 uint16_t njoin;
978 uint16_t nprune;
979 u_int i, j;
980
981 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
982 ND_PRINT(", upstream-neighbor: ");
983 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
984 goto trunc;
985 bp += advance; len -= advance;
986 }
987 if (len < 4)
988 goto trunc;
989 ND_TCHECK_4(bp);
990 ngroup = GET_U_1(bp + 1);
991 holdtime = GET_BE_U_2(bp + 2);
992 ND_PRINT("\n\t %u group(s)", ngroup);
993 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
994 ND_PRINT(", holdtime: ");
995 if (holdtime == 0xffff)
996 ND_PRINT("infinite");
997 else
998 unsigned_relts_print(ndo, holdtime);
999 }
1000 bp += 4; len -= 4;
1001 for (i = 0; i < ngroup; i++) {
1002 ND_PRINT("\n\t group #%u: ", i+1);
1003 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1004 goto trunc;
1005 bp += advance; len -= advance;
1006 if (len < 4)
1007 goto trunc;
1008 ND_TCHECK_4(bp);
1009 njoin = GET_BE_U_2(bp);
1010 nprune = GET_BE_U_2(bp + 2);
1011 ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune);
1012 bp += 4; len -= 4;
1013 for (j = 0; j < njoin; j++) {
1014 ND_PRINT("\n\t joined 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 for (j = 0; j < nprune; j++) {
1020 ND_PRINT("\n\t pruned source #%u: ", j+1);
1021 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1022 goto trunc;
1023 bp += advance; len -= advance;
1024 }
1025 }
1026 break;
1027 }
1028
1029 case PIMV2_TYPE_BOOTSTRAP:
1030 {
1031 u_int i, j, frpcnt;
1032
1033 /* Fragment Tag, Hash Mask len, and BSR-priority */
1034 if (len < 2)
1035 goto trunc;
1036 ND_PRINT(" tag=%x", GET_BE_U_2(bp));
1037 bp += 2;
1038 len -= 2;
1039 if (len < 1)
1040 goto trunc;
1041 ND_PRINT(" hashmlen=%u", GET_U_1(bp));
1042 if (len < 2)
1043 goto trunc;
1044 ND_TCHECK_1(bp + 2);
1045 ND_PRINT(" BSRprio=%u", GET_U_1(bp + 1));
1046 bp += 2;
1047 len -= 2;
1048
1049 /* Encoded-Unicast-BSR-Address */
1050 ND_PRINT(" BSR=");
1051 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1052 goto trunc;
1053 bp += advance;
1054 len -= advance;
1055
1056 for (i = 0; len > 0; i++) {
1057 /* Encoded-Group Address */
1058 ND_PRINT(" (group%u: ", i);
1059 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1060 goto trunc;
1061 bp += advance;
1062 len -= advance;
1063
1064 /* RP-Count, Frag RP-Cnt, and rsvd */
1065 if (len < 1)
1066 goto trunc;
1067 ND_PRINT(" RPcnt=%u", GET_U_1(bp));
1068 if (len < 2)
1069 goto trunc;
1070 frpcnt = GET_U_1(bp + 1);
1071 ND_PRINT(" FRPcnt=%u", frpcnt);
1072 if (len < 4)
1073 goto trunc;
1074 bp += 4;
1075 len -= 4;
1076
1077 for (j = 0; j < frpcnt && len > 0; j++) {
1078 /* each RP info */
1079 ND_PRINT(" RP%u=", j);
1080 if ((advance = pimv2_addr_print(ndo, bp, len,
1081 pimv2_unicast,
1082 pimv2_addr_len,
1083 0)) < 0)
1084 goto trunc;
1085 bp += advance;
1086 len -= advance;
1087
1088 if (len < 2)
1089 goto trunc;
1090 ND_PRINT(",holdtime=");
1091 unsigned_relts_print(ndo,
1092 GET_BE_U_2(bp));
1093 if (len < 3)
1094 goto trunc;
1095 ND_PRINT(",prio=%u", GET_U_1(bp + 2));
1096 if (len < 4)
1097 goto trunc;
1098 bp += 4;
1099 len -= 4;
1100 }
1101 ND_PRINT(")");
1102 }
1103 break;
1104 }
1105 case PIMV2_TYPE_ASSERT:
1106 ND_PRINT(" group=");
1107 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1108 goto trunc;
1109 bp += advance; len -= advance;
1110 ND_PRINT(" src=");
1111 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1112 goto trunc;
1113 bp += advance; len -= advance;
1114 if (len < 8)
1115 goto trunc;
1116 ND_TCHECK_8(bp);
1117 if (GET_U_1(bp) & 0x80)
1118 ND_PRINT(" RPT");
1119 ND_PRINT(" pref=%u", GET_BE_U_4(bp) & 0x7fffffff);
1120 ND_PRINT(" metric=%u", GET_BE_U_4(bp + 4));
1121 break;
1122
1123 case PIMV2_TYPE_CANDIDATE_RP:
1124 {
1125 u_int i, pfxcnt;
1126
1127 /* Prefix-Cnt, Priority, and Holdtime */
1128 if (len < 1)
1129 goto trunc;
1130 ND_PRINT(" prefix-cnt=%u", GET_U_1(bp));
1131 pfxcnt = GET_U_1(bp);
1132 if (len < 2)
1133 goto trunc;
1134 ND_PRINT(" prio=%u", GET_U_1(bp + 1));
1135 if (len < 4)
1136 goto trunc;
1137 ND_PRINT(" holdtime=");
1138 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
1139 bp += 4;
1140 len -= 4;
1141
1142 /* Encoded-Unicast-RP-Address */
1143 ND_PRINT(" RP=");
1144 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1145 goto trunc;
1146 bp += advance;
1147 len -= advance;
1148
1149 /* Encoded-Group Addresses */
1150 for (i = 0; i < pfxcnt && len > 0; i++) {
1151 ND_PRINT(" Group%u=", i);
1152 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1153 goto trunc;
1154 bp += advance;
1155 len -= advance;
1156 }
1157 break;
1158 }
1159
1160 case PIMV2_TYPE_PRUNE_REFRESH:
1161 ND_PRINT(" src=");
1162 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1163 goto trunc;
1164 bp += advance;
1165 len -= advance;
1166 ND_PRINT(" grp=");
1167 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1168 goto trunc;
1169 bp += advance;
1170 len -= advance;
1171 ND_PRINT(" forwarder=");
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 if (len < 2)
1177 goto trunc;
1178 ND_PRINT(" TUNR ");
1179 unsigned_relts_print(ndo, GET_BE_U_2(bp));
1180 break;
1181
1182 case PIMV2_TYPE_DF_ELECTION:
1183 subtype = PIM_SUBTYPE(GET_U_1(pim->pim_rsv));
1184 ND_PRINT("\n\t %s,", tok2str( pimv2_df_election_flag_values,
1185 "Unknown", subtype) );
1186
1187 ND_PRINT(" rpa=");
1188 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1189 goto trunc;
1190 }
1191 bp += advance;
1192 len -= advance;
1193 ND_PRINT(" sender pref=%u", GET_BE_U_4(bp) );
1194 ND_PRINT(" sender metric=%u", GET_BE_U_4(bp + 4));
1195
1196 bp += 8;
1197 len -= 8;
1198
1199 switch (subtype) {
1200 case PIMV2_DF_ELECTION_BACKOFF:
1201 case PIMV2_DF_ELECTION_PASS:
1202 ND_PRINT("\n\t %s addr=", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype));
1203 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1204 goto trunc;
1205 }
1206 bp += advance;
1207 len -= advance;
1208
1209 ND_PRINT(" %s pref=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp) );
1210 ND_PRINT(" %s metric=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp + 4));
1211
1212 bp += 8;
1213 len -= 8;
1214
1215 if (subtype == PIMV2_DF_ELECTION_BACKOFF) {
1216 ND_PRINT(" interval %dms", GET_BE_U_2(bp));
1217 }
1218
1219 break;
1220 default:
1221 break;
1222 }
1223 break;
1224
1225 default:
1226 ND_PRINT(" [type %u]", PIM_TYPE(pim_typever));
1227 break;
1228 }
1229
1230 return;
1231
1232 trunc:
1233 nd_print_trunc(ndo);
1234 }
[mirror] the TCPdump network dissector