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ptp: Add test for v2.1 packets
[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 #define PIMV2_DF_ELECTION_OFFER 1
122 #define PIMV2_DF_ELECTION_WINNER 2
123 #define PIMV2_DF_ELECTION_BACKOFF 3
124 #define PIMV2_DF_ELECTION_PASS 4
125
126 static const struct tok pimv2_df_election_flag_values[] = {
127 { PIMV2_DF_ELECTION_OFFER, "Offer" },
128 { PIMV2_DF_ELECTION_WINNER, "Winner" },
129 { PIMV2_DF_ELECTION_BACKOFF, "Backoff" },
130 { PIMV2_DF_ELECTION_PASS, "Pass" },
131 { 0, NULL}
132 };
133
134 #define PIMV2_DF_ELECTION_PASS_BACKOFF_STR(x) ( \
135 x == PIMV2_DF_ELECTION_BACKOFF ? "offer" : "new winner" )
136
137
138 /*
139 * XXX: We consider a case where IPv6 is not ready yet for portability,
140 * but PIM dependent definitions should be independent of IPv6...
141 */
142
143 struct pim {
144 nd_uint8_t pim_typever;
145 /* upper 4bit: PIM version number; 2 for PIMv2 */
146 /* lower 4bit: the PIM message type, currently they are:
147 * Hello, Register, Register-Stop, Join/Prune,
148 * Bootstrap, Assert, Graft (PIM-DM only),
149 * Graft-Ack (PIM-DM only), C-RP-Adv
150 */
151 #define PIM_VER(x) (((x) & 0xf0) >> 4)
152 #define PIM_TYPE(x) ((x) & 0x0f)
153 nd_uint8_t pim_rsv; /* Reserved in v1, subtype+address length in v2 */
154 #define PIM_SUBTYPE(x) (((x) & 0xf0) >> 4)
155 nd_uint16_t pim_cksum; /* IP style check sum */
156 };
157
158 static void pimv2_print(netdissect_options *, const u_char *bp, u_int len, const u_char *);
159
160 static void
161 pimv1_join_prune_print(netdissect_options *ndo,
162 const u_char *bp, u_int len)
163 {
164 u_int ngroups, njoin, nprune;
165 u_int njp;
166
167 /* If it's a single group and a single source, use 1-line output. */
168 if (ND_TTEST_LEN(bp, 30) && GET_U_1(bp + 11) == 1 &&
169 ((njoin = GET_BE_U_2(bp + 20)) + GET_BE_U_2(bp + 22)) == 1) {
170 u_int hold;
171
172 ND_PRINT(" RPF %s ", GET_IPADDR_STRING(bp));
173 hold = GET_BE_U_2(bp + 6);
174 if (hold != 180) {
175 ND_PRINT("Hold ");
176 unsigned_relts_print(ndo, hold);
177 }
178 ND_PRINT("%s (%s/%u, %s", njoin ? "Join" : "Prune",
179 GET_IPADDR_STRING(bp + 26), GET_U_1(bp + 25) & 0x3f,
180 GET_IPADDR_STRING(bp + 12));
181 if (GET_BE_U_4(bp + 16) != 0xffffffff)
182 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 16));
183 ND_PRINT(") %s%s %s",
184 (GET_U_1(bp + 24) & 0x01) ? "Sparse" : "Dense",
185 (GET_U_1(bp + 25) & 0x80) ? " WC" : "",
186 (GET_U_1(bp + 25) & 0x40) ? "RP" : "SPT");
187 return;
188 }
189
190 if (len < sizeof(nd_ipv4))
191 goto trunc;
192 if (ndo->ndo_vflag > 1)
193 ND_PRINT("\n");
194 ND_PRINT(" Upstream Nbr: %s", GET_IPADDR_STRING(bp));
195 bp += 4;
196 len -= 4;
197 if (len < 4)
198 goto trunc;
199 if (ndo->ndo_vflag > 1)
200 ND_PRINT("\n");
201 ND_PRINT(" Hold time: ");
202 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
203 if (ndo->ndo_vflag < 2)
204 return;
205 bp += 4;
206 len -= 4;
207
208 if (len < 4)
209 goto trunc;
210 ngroups = GET_U_1(bp + 3);
211 bp += 4;
212 len -= 4;
213 while (ngroups != 0) {
214 /*
215 * XXX - does the address have length "addrlen" and the
216 * mask length "maddrlen"?
217 */
218 if (len < 4)
219 goto trunc;
220 ND_PRINT("\n\tGroup: %s", GET_IPADDR_STRING(bp));
221 bp += 4;
222 len -= 4;
223 if (len < 4)
224 goto trunc;
225 if (GET_BE_U_4(bp) != 0xffffffff)
226 ND_PRINT("/%s", GET_IPADDR_STRING(bp));
227 bp += 4;
228 len -= 4;
229 if (len < 4)
230 goto trunc;
231 njoin = GET_BE_U_2(bp);
232 nprune = GET_BE_U_2(bp + 2);
233 ND_PRINT(" joined: %u pruned: %u", njoin, nprune);
234 bp += 4;
235 len -= 4;
236 for (njp = 0; njp < (njoin + nprune); njp++) {
237 const char *type;
238
239 if (njp < njoin)
240 type = "Join ";
241 else
242 type = "Prune";
243 if (len < 6)
244 goto trunc;
245 ND_PRINT("\n\t%s %s%s%s%s/%u", type,
246 (GET_U_1(bp) & 0x01) ? "Sparse " : "Dense ",
247 (GET_U_1(bp + 1) & 0x80) ? "WC " : "",
248 (GET_U_1(bp + 1) & 0x40) ? "RP " : "SPT ",
249 GET_IPADDR_STRING(bp + 2),
250 GET_U_1(bp + 1) & 0x3f);
251 bp += 6;
252 len -= 6;
253 }
254 ngroups--;
255 }
256 return;
257 trunc:
258 nd_print_trunc(ndo);
259 }
260
261 void
262 pimv1_print(netdissect_options *ndo,
263 const u_char *bp, u_int len)
264 {
265 u_char type;
266
267 ndo->ndo_protocol = "pimv1";
268 type = GET_U_1(bp + 1);
269
270 ND_PRINT(" %s", tok2str(pimv1_type_str, "[type %u]", type));
271 switch (type) {
272 case PIMV1_TYPE_QUERY:
273 if (ND_TTEST_1(bp + 8)) {
274 switch (GET_U_1(bp + 8) >> 4) {
275 case 0:
276 ND_PRINT(" Dense-mode");
277 break;
278 case 1:
279 ND_PRINT(" Sparse-mode");
280 break;
281 case 2:
282 ND_PRINT(" Sparse-Dense-mode");
283 break;
284 default:
285 ND_PRINT(" mode-%u", GET_U_1(bp + 8) >> 4);
286 break;
287 }
288 }
289 if (ndo->ndo_vflag) {
290 ND_PRINT(" (Hold-time ");
291 unsigned_relts_print(ndo, GET_BE_U_2(bp + 10));
292 ND_PRINT(")");
293 }
294 break;
295
296 case PIMV1_TYPE_REGISTER:
297 ND_TCHECK_LEN(bp + 8, 20); /* ip header */
298 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 20),
299 GET_IPADDR_STRING(bp + 24));
300 break;
301 case PIMV1_TYPE_REGISTER_STOP:
302 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 8),
303 GET_IPADDR_STRING(bp + 12));
304 break;
305 case PIMV1_TYPE_RP_REACHABILITY:
306 if (ndo->ndo_vflag) {
307 ND_PRINT(" group %s", GET_IPADDR_STRING(bp + 8));
308 if (GET_BE_U_4(bp + 12) != 0xffffffff)
309 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
310 ND_PRINT(" RP %s hold ", GET_IPADDR_STRING(bp + 16));
311 unsigned_relts_print(ndo, GET_BE_U_2(bp + 22));
312 }
313 break;
314 case PIMV1_TYPE_ASSERT:
315 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 16),
316 GET_IPADDR_STRING(bp + 8));
317 if (GET_BE_U_4(bp + 12) != 0xffffffff)
318 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
319 ND_PRINT(" %s pref %u metric %u",
320 (GET_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT",
321 GET_BE_U_4(bp + 20) & 0x7fffffff,
322 GET_BE_U_4(bp + 24));
323 break;
324 case PIMV1_TYPE_JOIN_PRUNE:
325 case PIMV1_TYPE_GRAFT:
326 case PIMV1_TYPE_GRAFT_ACK:
327 if (ndo->ndo_vflag) {
328 if (len < 8)
329 goto trunc;
330 pimv1_join_prune_print(ndo, bp + 8, len - 8);
331 }
332 break;
333 }
334 if ((GET_U_1(bp + 4) >> 4) != 1)
335 ND_PRINT(" [v%u]", GET_U_1(bp + 4) >> 4);
336 return;
337
338 trunc:
339 nd_print_trunc(ndo);
340 }
341
342 /*
343 * auto-RP is a cisco protocol, documented at
344 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
345 *
346 * This implements version 1+, dated Sept 9, 1998.
347 */
348 void
349 cisco_autorp_print(netdissect_options *ndo,
350 const u_char *bp, u_int len)
351 {
352 u_int type;
353 u_int numrps;
354 u_int hold;
355
356 ndo->ndo_protocol = "cisco_autorp";
357 if (len < 8)
358 goto trunc;
359 ND_PRINT(" auto-rp ");
360 type = GET_U_1(bp);
361 switch (type) {
362 case 0x11:
363 ND_PRINT("candidate-advert");
364 break;
365 case 0x12:
366 ND_PRINT("mapping");
367 break;
368 default:
369 ND_PRINT("type-0x%02x", type);
370 break;
371 }
372
373 numrps = GET_U_1(bp + 1);
374
375 ND_PRINT(" Hold ");
376 hold = GET_BE_U_2(bp + 2);
377 if (hold)
378 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
379 else
380 ND_PRINT("FOREVER");
381
382 /* Next 4 bytes are reserved. */
383
384 bp += 8; len -= 8;
385
386 /*XXX skip unless -v? */
387
388 /*
389 * Rest of packet:
390 * numrps entries of the form:
391 * 32 bits: RP
392 * 6 bits: reserved
393 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
394 * 8 bits: # of entries for this RP
395 * each entry: 7 bits: reserved, 1 bit: negative,
396 * 8 bits: mask 32 bits: source
397 * lather, rinse, repeat.
398 */
399 while (numrps != 0) {
400 u_int nentries;
401 char s;
402
403 if (len < 4)
404 goto trunc;
405 ND_PRINT(" RP %s", GET_IPADDR_STRING(bp));
406 bp += 4;
407 len -= 4;
408 if (len < 1)
409 goto trunc;
410 switch (GET_U_1(bp) & 0x3) {
411 case 0: ND_PRINT(" PIMv?");
412 break;
413 case 1: ND_PRINT(" PIMv1");
414 break;
415 case 2: ND_PRINT(" PIMv2");
416 break;
417 case 3: ND_PRINT(" PIMv1+2");
418 break;
419 }
420 if (GET_U_1(bp) & 0xfc)
421 ND_PRINT(" [rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
422 bp += 1;
423 len -= 1;
424 if (len < 1)
425 goto trunc;
426 nentries = GET_U_1(bp);
427 bp += 1;
428 len -= 1;
429 s = ' ';
430 while (nentries != 0) {
431 if (len < 6)
432 goto trunc;
433 ND_PRINT("%c%s%s/%u", s, GET_U_1(bp) & 1 ? "!" : "",
434 GET_IPADDR_STRING(bp + 2), GET_U_1(bp + 1));
435 if (GET_U_1(bp) & 0x02) {
436 ND_PRINT(" bidir");
437 }
438 if (GET_U_1(bp) & 0xfc) {
439 ND_PRINT("[rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
440 }
441 s = ',';
442 bp += 6; len -= 6;
443 nentries--;
444 }
445 numrps--;
446 }
447 return;
448
449 trunc:
450 nd_print_trunc(ndo);
451 }
452
453 void
454 pim_print(netdissect_options *ndo,
455 const u_char *bp, u_int len, const u_char *bp2)
456 {
457 const struct pim *pim = (const struct pim *)bp;
458 uint8_t pim_typever;
459
460 ndo->ndo_protocol = "pim";
461
462 pim_typever = GET_U_1(pim->pim_typever);
463 switch (PIM_VER(pim_typever)) {
464 case 2:
465 if (!ndo->ndo_vflag) {
466 ND_PRINT("PIMv%u, %s, length %u",
467 PIM_VER(pim_typever),
468 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)),
469 len);
470 return;
471 } else {
472 ND_PRINT("PIMv%u, length %u\n\t%s",
473 PIM_VER(pim_typever),
474 len,
475 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)));
476 pimv2_print(ndo, bp, len, bp2);
477 }
478 break;
479 default:
480 ND_PRINT("PIMv%u, length %u",
481 PIM_VER(pim_typever),
482 len);
483 break;
484 }
485 }
486
487 /*
488 * PIMv2 uses encoded address representations.
489 *
490 * The last PIM-SM I-D before RFC2117 was published specified the
491 * following representation for unicast addresses. However, RFC2117
492 * specified no encoding for unicast addresses with the unicast
493 * address length specified in the header. Therefore, we have to
494 * guess which encoding is being used (Cisco's PIMv2 implementation
495 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
496 * field into a 'unicast-address-length-in-bytes' field. We guess
497 * that it's the draft encoding if this reserved field is zero.
498 *
499 * RFC2362 goes back to the encoded format, and calls the addr length
500 * field "reserved" again.
501 *
502 * The first byte is the address family, from:
503 *
504 * 0 Reserved
505 * 1 IP (IP version 4)
506 * 2 IP6 (IP version 6)
507 * 3 NSAP
508 * 4 HDLC (8-bit multidrop)
509 * 5 BBN 1822
510 * 6 802 (includes all 802 media plus Ethernet "canonical format")
511 * 7 E.163
512 * 8 E.164 (SMDS, Frame Relay, ATM)
513 * 9 F.69 (Telex)
514 * 10 X.121 (X.25, Frame Relay)
515 * 11 IPX
516 * 12 Appletalk
517 * 13 Decnet IV
518 * 14 Banyan Vines
519 * 15 E.164 with NSAP format subaddress
520 *
521 * In addition, the second byte is an "Encoding". 0 is the default
522 * encoding for the address family, and no other encodings are currently
523 * specified.
524 *
525 */
526
527 enum pimv2_addrtype {
528 pimv2_unicast, pimv2_group, pimv2_source
529 };
530
531 /* 0 1 2 3
532 * 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
533 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
534 * | Addr Family | Encoding Type | Unicast Address |
535 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
536 * 0 1 2 3
537 * 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
538 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
539 * | Addr Family | Encoding Type | Reserved | Mask Len |
540 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
541 * | Group multicast Address |
542 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
543 * 0 1 2 3
544 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
546 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
547 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
548 * | Source Address |
549 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
550 */
551 static int
552 pimv2_addr_print(netdissect_options *ndo,
553 const u_char *bp, u_int len, enum pimv2_addrtype at,
554 u_int addr_len, int silent)
555 {
556 u_int af;
557 int hdrlen;
558
559 if (addr_len == 0) {
560 if (len < 2)
561 goto trunc;
562 switch (GET_U_1(bp)) {
563 case 1:
564 af = AF_INET;
565 addr_len = (u_int)sizeof(nd_ipv4);
566 break;
567 case 2:
568 af = AF_INET6;
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 = AF_INET;
581 break;
582 case sizeof(nd_ipv6):
583 af = AF_INET6;
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 == AF_INET) {
600 if (!silent)
601 ND_PRINT("%s", GET_IPADDR_STRING(bp));
602 } else if (af == AF_INET6) {
603 if (!silent)
604 ND_PRINT("%s", GET_IP6ADDR_STRING(bp));
605 }
606 return hdrlen + addr_len;
607 case pimv2_group:
608 case pimv2_source:
609 if (len < addr_len + 2)
610 goto trunc;
611 ND_TCHECK_LEN(bp, addr_len + 2);
612 if (af == AF_INET) {
613 if (!silent) {
614 ND_PRINT("%s", GET_IPADDR_STRING(bp + 2));
615 if (GET_U_1(bp + 1) != 32)
616 ND_PRINT("/%u", GET_U_1(bp + 1));
617 }
618 } else if (af == AF_INET6) {
619 if (!silent) {
620 ND_PRINT("%s", GET_IP6ADDR_STRING(bp + 2));
621 if (GET_U_1(bp + 1) != 128)
622 ND_PRINT("/%u", GET_U_1(bp + 1));
623 }
624 }
625 if (GET_U_1(bp) && !silent) {
626 if (at == pimv2_group) {
627 ND_PRINT("(0x%02x)", GET_U_1(bp));
628 } else {
629 ND_PRINT("(%s%s%s",
630 GET_U_1(bp) & 0x04 ? "S" : "",
631 GET_U_1(bp) & 0x02 ? "W" : "",
632 GET_U_1(bp) & 0x01 ? "R" : "");
633 if (GET_U_1(bp) & 0xf8) {
634 ND_PRINT("+0x%02x",
635 GET_U_1(bp) & 0xf8);
636 }
637 ND_PRINT(")");
638 }
639 }
640 return hdrlen + 2 + addr_len;
641 default:
642 return -1;
643 }
644 trunc:
645 return -1;
646 }
647
648 enum checksum_status {
649 CORRECT,
650 INCORRECT,
651 UNVERIFIED
652 };
653
654 static enum checksum_status
655 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
656 const u_char *bp2, u_int len)
657 {
658 const struct ip *ip;
659 u_int cksum;
660
661 if (!ND_TTEST_LEN(bp, len)) {
662 /* We don't have all the data. */
663 return (UNVERIFIED);
664 }
665 ip = (const struct ip *)bp2;
666 if (IP_V(ip) == 4) {
667 struct cksum_vec vec[1];
668
669 vec[0].ptr = bp;
670 vec[0].len = len;
671 cksum = in_cksum(vec, 1);
672 return (cksum ? INCORRECT : CORRECT);
673 } else if (IP_V(ip) == 6) {
674 const struct ip6_hdr *ip6;
675
676 ip6 = (const struct ip6_hdr *)bp2;
677 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
678 return (cksum ? INCORRECT : CORRECT);
679 } else {
680 return (UNVERIFIED);
681 }
682 }
683
684 static void
685 pimv2_print(netdissect_options *ndo,
686 const u_char *bp, u_int len, const u_char *bp2)
687 {
688 const struct pim *pim = (const struct pim *)bp;
689 int advance;
690 int subtype;
691 enum checksum_status cksum_status;
692 u_int pim_typever;
693 u_int pimv2_addr_len;
694
695 ndo->ndo_protocol = "pimv2";
696 if (len < 2) {
697 ND_PRINT("[length %u < 2]", len);
698 nd_print_invalid(ndo);
699 return;
700 }
701 pim_typever = GET_U_1(pim->pim_typever);
702 /* RFC5015 allocates the high 4 bits of pim_rsv for "subtype". */
703 pimv2_addr_len = GET_U_1(pim->pim_rsv) & 0x0f;
704 if (pimv2_addr_len != 0)
705 ND_PRINT(", RFC2117-encoding");
706
707 if (len < 4) {
708 ND_PRINT("[length %u < 4]", len);
709 nd_print_invalid(ndo);
710 return;
711 }
712 ND_PRINT(", cksum 0x%04x ", GET_BE_U_2(pim->pim_cksum));
713 if (GET_BE_U_2(pim->pim_cksum) == 0) {
714 ND_PRINT("(unverified)");
715 } else {
716 if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) {
717 /*
718 * The checksum only covers the packet header,
719 * not the encapsulated packet.
720 */
721 cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
722 if (cksum_status == INCORRECT) {
723 /*
724 * To quote RFC 4601, "For interoperability
725 * reasons, a message carrying a checksum
726 * calculated over the entire PIM Register
727 * message should also be accepted."
728 */
729 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
730 }
731 } else {
732 /*
733 * The checksum covers the entire packet.
734 */
735 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
736 }
737 switch (cksum_status) {
738
739 case CORRECT:
740 ND_PRINT("(correct)");
741 break;
742
743 case INCORRECT:
744 ND_PRINT("(incorrect)");
745 break;
746
747 case UNVERIFIED:
748 ND_PRINT("(unverified)");
749 break;
750 }
751 }
752 bp += 4;
753 len -= 4;
754
755 switch (PIM_TYPE(pim_typever)) {
756 case PIMV2_TYPE_HELLO:
757 {
758 uint16_t otype, olen;
759 while (len > 0) {
760 if (len < 4)
761 goto trunc;
762 otype = GET_BE_U_2(bp);
763 olen = GET_BE_U_2(bp + 2);
764 ND_PRINT("\n\t %s Option (%u), length %u, Value: ",
765 tok2str(pimv2_hello_option_values, "Unknown", otype),
766 otype,
767 olen);
768 bp += 4;
769 len -= 4;
770
771 if (len < olen)
772 goto trunc;
773 ND_TCHECK_LEN(bp, olen);
774 switch (otype) {
775 case PIMV2_HELLO_OPTION_HOLDTIME:
776 if (olen != 2) {
777 ND_PRINT("[option length %u != 2]", olen);
778 nd_print_invalid(ndo);
779 return;
780 } else {
781 unsigned_relts_print(ndo,
782 GET_BE_U_2(bp));
783 }
784 break;
785
786 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
787 if (olen != 4) {
788 ND_PRINT("[option length %u != 4]", olen);
789 nd_print_invalid(ndo);
790 return;
791 } else {
792 char t_bit;
793 uint16_t lan_delay, override_interval;
794 lan_delay = GET_BE_U_2(bp);
795 override_interval = GET_BE_U_2(bp + 2);
796 t_bit = (lan_delay & 0x8000)? 1 : 0;
797 lan_delay &= ~0x8000;
798 ND_PRINT("\n\t T-bit=%u, LAN delay %ums, Override interval %ums",
799 t_bit, lan_delay, override_interval);
800 }
801 break;
802
803 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
804 case PIMV2_HELLO_OPTION_DR_PRIORITY:
805 switch (olen) {
806 case 0:
807 ND_PRINT("Bi-Directional Capability (Old)");
808 break;
809 case 4:
810 ND_PRINT("%u", GET_BE_U_4(bp));
811 break;
812 default:
813 ND_PRINT("[option length %u != 4]", olen);
814 nd_print_invalid(ndo);
815 return;
816 break;
817 }
818 break;
819
820 case PIMV2_HELLO_OPTION_GENID:
821 if (olen != 4) {
822 ND_PRINT("[option length %u != 4]", olen);
823 nd_print_invalid(ndo);
824 return;
825 } else {
826 ND_PRINT("0x%08x", GET_BE_U_4(bp));
827 }
828 break;
829
830 case PIMV2_HELLO_OPTION_REFRESH_CAP:
831 if (olen != 4) {
832 ND_PRINT("[option length %u != 4]", olen);
833 nd_print_invalid(ndo);
834 return;
835 } else {
836 ND_PRINT("v%u", GET_U_1(bp));
837 if (GET_U_1(bp + 1) != 0) {
838 ND_PRINT(", interval ");
839 unsigned_relts_print(ndo,
840 GET_U_1(bp + 1));
841 }
842 if (GET_BE_U_2(bp + 2) != 0) {
843 ND_PRINT(" ?0x%04x?",
844 GET_BE_U_2(bp + 2));
845 }
846 }
847 break;
848
849 case PIMV2_HELLO_OPTION_BIDIR_CAP:
850 break;
851
852 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
853 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
854 if (ndo->ndo_vflag > 1) {
855 const u_char *ptr = bp;
856 u_int plen = len;
857 while (ptr < (bp+olen)) {
858 ND_PRINT("\n\t ");
859 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
860 if (advance < 0)
861 goto trunc;
862 ptr += advance;
863 plen -= advance;
864 }
865 }
866 break;
867 default:
868 if (ndo->ndo_vflag <= 1)
869 print_unknown_data(ndo, bp, "\n\t ", olen);
870 break;
871 }
872 /* do we want to see an additionally hexdump ? */
873 if (ndo->ndo_vflag> 1)
874 print_unknown_data(ndo, bp, "\n\t ", olen);
875 bp += olen;
876 len -= olen;
877 }
878 break;
879 }
880
881 case PIMV2_TYPE_REGISTER:
882 {
883 const struct ip *ip;
884
885 if (len < 4)
886 goto trunc;
887 ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN);
888
889 ND_PRINT(", Flags [ %s ]\n\t",
890 tok2str(pimv2_register_flag_values,
891 "none",
892 GET_BE_U_4(bp)));
893
894 bp += 4; len -= 4;
895 /* encapsulated multicast packet */
896 if (len == 0)
897 goto trunc;
898 ip = (const struct ip *)bp;
899 switch (IP_V(ip)) {
900 case 0: /* Null header */
901 ND_PRINT("IP-Null-header %s > %s",
902 GET_IPADDR_STRING(ip->ip_src),
903 GET_IPADDR_STRING(ip->ip_dst));
904 break;
905
906 case 4: /* IPv4 */
907 ip_print(ndo, bp, len);
908 break;
909
910 case 6: /* IPv6 */
911 ip6_print(ndo, bp, len);
912 break;
913
914 default:
915 ND_PRINT("IP ver %u", IP_V(ip));
916 break;
917 }
918 break;
919 }
920
921 case PIMV2_TYPE_REGISTER_STOP:
922 ND_PRINT(" group=");
923 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
924 goto trunc;
925 bp += advance; len -= advance;
926 ND_PRINT(" source=");
927 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
928 goto trunc;
929 bp += advance; len -= advance;
930 break;
931
932 case PIMV2_TYPE_JOIN_PRUNE:
933 case PIMV2_TYPE_GRAFT:
934 case PIMV2_TYPE_GRAFT_ACK:
935
936
937 /*
938 * 0 1 2 3
939 * 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
940 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
941 * |PIM Ver| Type | Addr length | Checksum |
942 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
943 * | Unicast-Upstream Neighbor Address |
944 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
945 * | Reserved | Num groups | Holdtime |
946 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
947 * | Encoded-Multicast Group Address-1 |
948 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
949 * | Number of Joined Sources | Number of Pruned Sources |
950 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
951 * | Encoded-Joined Source Address-1 |
952 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
953 * | . |
954 * | . |
955 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
956 * | Encoded-Joined Source Address-n |
957 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
958 * | Encoded-Pruned Source Address-1 |
959 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
960 * | . |
961 * | . |
962 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
963 * | Encoded-Pruned Source Address-n |
964 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
965 * | . |
966 * | . |
967 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
968 * | Encoded-Multicast Group Address-n |
969 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
970 */
971
972 {
973 uint8_t ngroup;
974 uint16_t holdtime;
975 uint16_t njoin;
976 uint16_t nprune;
977 u_int i, j;
978
979 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
980 ND_PRINT(", upstream-neighbor: ");
981 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
982 goto trunc;
983 bp += advance; len -= advance;
984 }
985 if (len < 4)
986 goto trunc;
987 ND_TCHECK_4(bp);
988 ngroup = GET_U_1(bp + 1);
989 holdtime = GET_BE_U_2(bp + 2);
990 ND_PRINT("\n\t %u group(s)", ngroup);
991 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
992 ND_PRINT(", holdtime: ");
993 if (holdtime == 0xffff)
994 ND_PRINT("infinite");
995 else
996 unsigned_relts_print(ndo, holdtime);
997 }
998 bp += 4; len -= 4;
999 for (i = 0; i < ngroup; i++) {
1000 ND_PRINT("\n\t group #%u: ", i+1);
1001 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1002 goto trunc;
1003 bp += advance; len -= advance;
1004 if (len < 4)
1005 goto trunc;
1006 ND_TCHECK_4(bp);
1007 njoin = GET_BE_U_2(bp);
1008 nprune = GET_BE_U_2(bp + 2);
1009 ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune);
1010 bp += 4; len -= 4;
1011 for (j = 0; j < njoin; j++) {
1012 ND_PRINT("\n\t joined source #%u: ", j+1);
1013 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1014 goto trunc;
1015 bp += advance; len -= advance;
1016 }
1017 for (j = 0; j < nprune; j++) {
1018 ND_PRINT("\n\t pruned source #%u: ", j+1);
1019 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1020 goto trunc;
1021 bp += advance; len -= advance;
1022 }
1023 }
1024 break;
1025 }
1026
1027 case PIMV2_TYPE_BOOTSTRAP:
1028 {
1029 u_int i, j, frpcnt;
1030
1031 /* Fragment Tag, Hash Mask len, and BSR-priority */
1032 if (len < 2)
1033 goto trunc;
1034 ND_PRINT(" tag=%x", GET_BE_U_2(bp));
1035 bp += 2;
1036 len -= 2;
1037 if (len < 1)
1038 goto trunc;
1039 ND_PRINT(" hashmlen=%u", GET_U_1(bp));
1040 if (len < 2)
1041 goto trunc;
1042 ND_TCHECK_1(bp + 2);
1043 ND_PRINT(" BSRprio=%u", GET_U_1(bp + 1));
1044 bp += 2;
1045 len -= 2;
1046
1047 /* Encoded-Unicast-BSR-Address */
1048 ND_PRINT(" BSR=");
1049 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1050 goto trunc;
1051 bp += advance;
1052 len -= advance;
1053
1054 for (i = 0; len > 0; i++) {
1055 /* Encoded-Group Address */
1056 ND_PRINT(" (group%u: ", i);
1057 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1058 goto trunc;
1059 bp += advance;
1060 len -= advance;
1061
1062 /* RP-Count, Frag RP-Cnt, and rsvd */
1063 if (len < 1)
1064 goto trunc;
1065 ND_PRINT(" RPcnt=%u", GET_U_1(bp));
1066 if (len < 2)
1067 goto trunc;
1068 frpcnt = GET_U_1(bp + 1);
1069 ND_PRINT(" FRPcnt=%u", frpcnt);
1070 if (len < 4)
1071 goto trunc;
1072 bp += 4;
1073 len -= 4;
1074
1075 for (j = 0; j < frpcnt && len > 0; j++) {
1076 /* each RP info */
1077 ND_PRINT(" RP%u=", j);
1078 if ((advance = pimv2_addr_print(ndo, bp, len,
1079 pimv2_unicast,
1080 pimv2_addr_len,
1081 0)) < 0)
1082 goto trunc;
1083 bp += advance;
1084 len -= advance;
1085
1086 if (len < 2)
1087 goto trunc;
1088 ND_PRINT(",holdtime=");
1089 unsigned_relts_print(ndo,
1090 GET_BE_U_2(bp));
1091 if (len < 3)
1092 goto trunc;
1093 ND_PRINT(",prio=%u", GET_U_1(bp + 2));
1094 if (len < 4)
1095 goto trunc;
1096 bp += 4;
1097 len -= 4;
1098 }
1099 ND_PRINT(")");
1100 }
1101 break;
1102 }
1103 case PIMV2_TYPE_ASSERT:
1104 ND_PRINT(" group=");
1105 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1106 goto trunc;
1107 bp += advance; len -= advance;
1108 ND_PRINT(" src=");
1109 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1110 goto trunc;
1111 bp += advance; len -= advance;
1112 if (len < 8)
1113 goto trunc;
1114 ND_TCHECK_8(bp);
1115 if (GET_U_1(bp) & 0x80)
1116 ND_PRINT(" RPT");
1117 ND_PRINT(" pref=%u", GET_BE_U_4(bp) & 0x7fffffff);
1118 ND_PRINT(" metric=%u", GET_BE_U_4(bp + 4));
1119 break;
1120
1121 case PIMV2_TYPE_CANDIDATE_RP:
1122 {
1123 u_int i, pfxcnt;
1124
1125 /* Prefix-Cnt, Priority, and Holdtime */
1126 if (len < 1)
1127 goto trunc;
1128 ND_PRINT(" prefix-cnt=%u", GET_U_1(bp));
1129 pfxcnt = GET_U_1(bp);
1130 if (len < 2)
1131 goto trunc;
1132 ND_PRINT(" prio=%u", GET_U_1(bp + 1));
1133 if (len < 4)
1134 goto trunc;
1135 ND_PRINT(" holdtime=");
1136 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
1137 bp += 4;
1138 len -= 4;
1139
1140 /* Encoded-Unicast-RP-Address */
1141 ND_PRINT(" RP=");
1142 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1143 goto trunc;
1144 bp += advance;
1145 len -= advance;
1146
1147 /* Encoded-Group Addresses */
1148 for (i = 0; i < pfxcnt && len > 0; i++) {
1149 ND_PRINT(" Group%u=", i);
1150 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1151 goto trunc;
1152 bp += advance;
1153 len -= advance;
1154 }
1155 break;
1156 }
1157
1158 case PIMV2_TYPE_PRUNE_REFRESH:
1159 ND_PRINT(" src=");
1160 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1161 goto trunc;
1162 bp += advance;
1163 len -= advance;
1164 ND_PRINT(" grp=");
1165 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1166 goto trunc;
1167 bp += advance;
1168 len -= advance;
1169 ND_PRINT(" forwarder=");
1170 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1171 goto trunc;
1172 bp += advance;
1173 len -= advance;
1174 if (len < 2)
1175 goto trunc;
1176 ND_PRINT(" TUNR ");
1177 unsigned_relts_print(ndo, GET_BE_U_2(bp));
1178 break;
1179
1180 case PIMV2_TYPE_DF_ELECTION:
1181 subtype = PIM_SUBTYPE(GET_U_1(pim->pim_rsv));
1182 ND_PRINT("\n\t %s,", tok2str( pimv2_df_election_flag_values,
1183 "Unknown", subtype) );
1184
1185 ND_PRINT(" rpa=");
1186 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1187 goto trunc;
1188 }
1189 bp += advance;
1190 len -= advance;
1191 ND_PRINT(" sender pref=%u", GET_BE_U_4(bp) );
1192 ND_PRINT(" sender metric=%u", GET_BE_U_4(bp + 4));
1193
1194 bp += 8;
1195 len -= 8;
1196
1197 switch (subtype) {
1198 case PIMV2_DF_ELECTION_BACKOFF:
1199 case PIMV2_DF_ELECTION_PASS:
1200 ND_PRINT("\n\t %s addr=", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype));
1201 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1202 goto trunc;
1203 }
1204 bp += advance;
1205 len -= advance;
1206
1207 ND_PRINT(" %s pref=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp) );
1208 ND_PRINT(" %s metric=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp + 4));
1209
1210 bp += 8;
1211 len -= 8;
1212
1213 if (subtype == PIMV2_DF_ELECTION_BACKOFF) {
1214 ND_PRINT(" interval %dms", GET_BE_U_2(bp));
1215 }
1216
1217 break;
1218 default:
1219 break;
1220 }
1221 break;
1222
1223 default:
1224 ND_PRINT(" [type %u]", PIM_TYPE(pim_typever));
1225 break;
1226 }
1227
1228 return;
1229
1230 trunc:
1231 nd_print_trunc(ndo);
1232 }
[mirror] the TCPdump network dissector