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CMake: Fix the comment about versions. [skip ci]
[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 #include <config.h>
25
26 #include "netdissect-stdinc.h"
27
28 #include "netdissect.h"
29 #include "addrtoname.h"
30 #include "extract.h"
31
32 #include "ip.h"
33 #include "ip6.h"
34 #include "ipproto.h"
35
36 #define PIMV1_TYPE_QUERY 0
37 #define PIMV1_TYPE_REGISTER 1
38 #define PIMV1_TYPE_REGISTER_STOP 2
39 #define PIMV1_TYPE_JOIN_PRUNE 3
40 #define PIMV1_TYPE_RP_REACHABILITY 4
41 #define PIMV1_TYPE_ASSERT 5
42 #define PIMV1_TYPE_GRAFT 6
43 #define PIMV1_TYPE_GRAFT_ACK 7
44
45 static const struct tok pimv1_type_str[] = {
46 { PIMV1_TYPE_QUERY, "Query" },
47 { PIMV1_TYPE_REGISTER, "Register" },
48 { PIMV1_TYPE_REGISTER_STOP, "Register-Stop" },
49 { PIMV1_TYPE_JOIN_PRUNE, "Join/Prune" },
50 { PIMV1_TYPE_RP_REACHABILITY, "RP-reachable" },
51 { PIMV1_TYPE_ASSERT, "Assert" },
52 { PIMV1_TYPE_GRAFT, "Graft" },
53 { PIMV1_TYPE_GRAFT_ACK, "Graft-ACK" },
54 { 0, NULL }
55 };
56
57 #define PIMV2_TYPE_HELLO 0
58 #define PIMV2_TYPE_REGISTER 1
59 #define PIMV2_TYPE_REGISTER_STOP 2
60 #define PIMV2_TYPE_JOIN_PRUNE 3
61 #define PIMV2_TYPE_BOOTSTRAP 4
62 #define PIMV2_TYPE_ASSERT 5
63 #define PIMV2_TYPE_GRAFT 6
64 #define PIMV2_TYPE_GRAFT_ACK 7
65 #define PIMV2_TYPE_CANDIDATE_RP 8
66 #define PIMV2_TYPE_PRUNE_REFRESH 9
67 #define PIMV2_TYPE_DF_ELECTION 10
68 #define PIMV2_TYPE_ECMP_REDIRECT 11
69
70 static const struct tok pimv2_type_values[] = {
71 { PIMV2_TYPE_HELLO, "Hello" },
72 { PIMV2_TYPE_REGISTER, "Register" },
73 { PIMV2_TYPE_REGISTER_STOP, "Register Stop" },
74 { PIMV2_TYPE_JOIN_PRUNE, "Join / Prune" },
75 { PIMV2_TYPE_BOOTSTRAP, "Bootstrap" },
76 { PIMV2_TYPE_ASSERT, "Assert" },
77 { PIMV2_TYPE_GRAFT, "Graft" },
78 { PIMV2_TYPE_GRAFT_ACK, "Graft Acknowledgement" },
79 { PIMV2_TYPE_CANDIDATE_RP, "Candidate RP Advertisement" },
80 { PIMV2_TYPE_PRUNE_REFRESH, "Prune Refresh" },
81 { PIMV2_TYPE_DF_ELECTION, "DF Election" },
82 { PIMV2_TYPE_ECMP_REDIRECT, "ECMP Redirect" },
83 { 0, NULL}
84 };
85
86 #define PIMV2_HELLO_OPTION_HOLDTIME 1
87 #define PIMV2_HELLO_OPTION_LANPRUNEDELAY 2
88 #define PIMV2_HELLO_OPTION_DR_PRIORITY_OLD 18
89 #define PIMV2_HELLO_OPTION_DR_PRIORITY 19
90 #define PIMV2_HELLO_OPTION_GENID 20
91 #define PIMV2_HELLO_OPTION_REFRESH_CAP 21
92 #define PIMV2_HELLO_OPTION_BIDIR_CAP 22
93 #define PIMV2_HELLO_OPTION_ADDRESS_LIST 24
94 #define PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD 65001
95
96 static const struct tok pimv2_hello_option_values[] = {
97 { PIMV2_HELLO_OPTION_HOLDTIME, "Hold Time" },
98 { PIMV2_HELLO_OPTION_LANPRUNEDELAY, "LAN Prune Delay" },
99 { PIMV2_HELLO_OPTION_DR_PRIORITY_OLD, "DR Priority (Old)" },
100 { PIMV2_HELLO_OPTION_DR_PRIORITY, "DR Priority" },
101 { PIMV2_HELLO_OPTION_GENID, "Generation ID" },
102 { PIMV2_HELLO_OPTION_REFRESH_CAP, "State Refresh Capability" },
103 { PIMV2_HELLO_OPTION_BIDIR_CAP, "Bi-Directional Capability" },
104 { PIMV2_HELLO_OPTION_ADDRESS_LIST, "Address List" },
105 { PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD, "Address List (Old)" },
106 { 0, NULL}
107 };
108
109 #define PIMV2_REGISTER_FLAG_LEN 4
110 #define PIMV2_REGISTER_FLAG_BORDER 0x80000000
111 #define PIMV2_REGISTER_FLAG_NULL 0x40000000
112
113 static const struct tok pimv2_register_flag_values[] = {
114 { PIMV2_REGISTER_FLAG_BORDER, "Border" },
115 { PIMV2_REGISTER_FLAG_NULL, "Null" },
116 { 0, NULL}
117 };
118
119 #define PIMV2_DF_ELECTION_OFFER 1
120 #define PIMV2_DF_ELECTION_WINNER 2
121 #define PIMV2_DF_ELECTION_BACKOFF 3
122 #define PIMV2_DF_ELECTION_PASS 4
123
124 static const struct tok pimv2_df_election_flag_values[] = {
125 { PIMV2_DF_ELECTION_OFFER, "Offer" },
126 { PIMV2_DF_ELECTION_WINNER, "Winner" },
127 { PIMV2_DF_ELECTION_BACKOFF, "Backoff" },
128 { PIMV2_DF_ELECTION_PASS, "Pass" },
129 { 0, NULL}
130 };
131
132 #define PIMV2_DF_ELECTION_PASS_BACKOFF_STR(x) ( \
133 x == PIMV2_DF_ELECTION_BACKOFF ? "offer" : "new winner" )
134
135
136 /*
137 * XXX: We consider a case where IPv6 is not ready yet for portability,
138 * but PIM dependent definitions should be independent of IPv6...
139 */
140
141 struct pim {
142 nd_uint8_t pim_typever;
143 /* upper 4bit: PIM version number; 2 for PIMv2 */
144 /* lower 4bit: the PIM message type, currently they are:
145 * Hello, Register, Register-Stop, Join/Prune,
146 * Bootstrap, Assert, Graft (PIM-DM only),
147 * Graft-Ack (PIM-DM only), C-RP-Adv
148 */
149 #define PIM_VER(x) (((x) & 0xf0) >> 4)
150 #define PIM_TYPE(x) ((x) & 0x0f)
151 nd_uint8_t pim_rsv; /* Reserved in v1, subtype+address length in v2 */
152 #define PIM_SUBTYPE(x) (((x) & 0xf0) >> 4)
153 nd_uint16_t pim_cksum; /* IP style check sum */
154 };
155
156 static void pimv2_print(netdissect_options *, const u_char *bp, u_int len, const u_char *);
157
158 static void
159 pimv1_join_prune_print(netdissect_options *ndo,
160 const u_char *bp, u_int len)
161 {
162 u_int ngroups, njoin, nprune;
163 u_int njp;
164
165 /* If it's a single group and a single source, use 1-line output. */
166 if (ND_TTEST_LEN(bp, 30) && GET_U_1(bp + 11) == 1 &&
167 ((njoin = GET_BE_U_2(bp + 20)) + GET_BE_U_2(bp + 22)) == 1) {
168 u_int hold;
169
170 ND_PRINT(" RPF %s ", GET_IPADDR_STRING(bp));
171 hold = GET_BE_U_2(bp + 6);
172 if (hold != 180) {
173 ND_PRINT("Hold ");
174 unsigned_relts_print(ndo, hold);
175 }
176 ND_PRINT("%s (%s/%u, %s", njoin ? "Join" : "Prune",
177 GET_IPADDR_STRING(bp + 26), GET_U_1(bp + 25) & 0x3f,
178 GET_IPADDR_STRING(bp + 12));
179 if (GET_BE_U_4(bp + 16) != 0xffffffff)
180 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 16));
181 ND_PRINT(") %s%s %s",
182 (GET_U_1(bp + 24) & 0x01) ? "Sparse" : "Dense",
183 (GET_U_1(bp + 25) & 0x80) ? " WC" : "",
184 (GET_U_1(bp + 25) & 0x40) ? "RP" : "SPT");
185 return;
186 }
187
188 if (len < sizeof(nd_ipv4))
189 goto trunc;
190 if (ndo->ndo_vflag > 1)
191 ND_PRINT("\n");
192 ND_PRINT(" Upstream Nbr: %s", GET_IPADDR_STRING(bp));
193 bp += 4;
194 len -= 4;
195 if (len < 4)
196 goto trunc;
197 if (ndo->ndo_vflag > 1)
198 ND_PRINT("\n");
199 ND_PRINT(" Hold time: ");
200 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
201 if (ndo->ndo_vflag < 2)
202 return;
203 bp += 4;
204 len -= 4;
205
206 if (len < 4)
207 goto trunc;
208 ngroups = GET_U_1(bp + 3);
209 bp += 4;
210 len -= 4;
211 while (ngroups != 0) {
212 /*
213 * XXX - does the address have length "addrlen" and the
214 * mask length "maddrlen"?
215 */
216 if (len < 4)
217 goto trunc;
218 ND_PRINT("\n\tGroup: %s", GET_IPADDR_STRING(bp));
219 bp += 4;
220 len -= 4;
221 if (len < 4)
222 goto trunc;
223 if (GET_BE_U_4(bp) != 0xffffffff)
224 ND_PRINT("/%s", GET_IPADDR_STRING(bp));
225 bp += 4;
226 len -= 4;
227 if (len < 4)
228 goto trunc;
229 njoin = GET_BE_U_2(bp);
230 nprune = GET_BE_U_2(bp + 2);
231 ND_PRINT(" joined: %u pruned: %u", njoin, nprune);
232 bp += 4;
233 len -= 4;
234 for (njp = 0; njp < (njoin + nprune); njp++) {
235 const char *type;
236
237 if (njp < njoin)
238 type = "Join ";
239 else
240 type = "Prune";
241 if (len < 6)
242 goto trunc;
243 ND_PRINT("\n\t%s %s%s%s%s/%u", type,
244 (GET_U_1(bp) & 0x01) ? "Sparse " : "Dense ",
245 (GET_U_1(bp + 1) & 0x80) ? "WC " : "",
246 (GET_U_1(bp + 1) & 0x40) ? "RP " : "SPT ",
247 GET_IPADDR_STRING(bp + 2),
248 GET_U_1(bp + 1) & 0x3f);
249 bp += 6;
250 len -= 6;
251 }
252 ngroups--;
253 }
254 return;
255 trunc:
256 nd_print_trunc(ndo);
257 }
258
259 void
260 pimv1_print(netdissect_options *ndo,
261 const u_char *bp, u_int len)
262 {
263 u_char type;
264
265 ndo->ndo_protocol = "pimv1";
266 type = GET_U_1(bp + 1);
267
268 ND_PRINT(" %s", tok2str(pimv1_type_str, "[type %u]", type));
269 switch (type) {
270 case PIMV1_TYPE_QUERY:
271 if (ND_TTEST_1(bp + 8)) {
272 switch (GET_U_1(bp + 8) >> 4) {
273 case 0:
274 ND_PRINT(" Dense-mode");
275 break;
276 case 1:
277 ND_PRINT(" Sparse-mode");
278 break;
279 case 2:
280 ND_PRINT(" Sparse-Dense-mode");
281 break;
282 default:
283 ND_PRINT(" mode-%u", GET_U_1(bp + 8) >> 4);
284 break;
285 }
286 }
287 if (ndo->ndo_vflag) {
288 ND_PRINT(" (Hold-time ");
289 unsigned_relts_print(ndo, GET_BE_U_2(bp + 10));
290 ND_PRINT(")");
291 }
292 break;
293
294 case PIMV1_TYPE_REGISTER:
295 ND_TCHECK_LEN(bp + 8, 20); /* ip header */
296 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 20),
297 GET_IPADDR_STRING(bp + 24));
298 break;
299 case PIMV1_TYPE_REGISTER_STOP:
300 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 8),
301 GET_IPADDR_STRING(bp + 12));
302 break;
303 case PIMV1_TYPE_RP_REACHABILITY:
304 if (ndo->ndo_vflag) {
305 ND_PRINT(" group %s", GET_IPADDR_STRING(bp + 8));
306 if (GET_BE_U_4(bp + 12) != 0xffffffff)
307 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
308 ND_PRINT(" RP %s hold ", GET_IPADDR_STRING(bp + 16));
309 unsigned_relts_print(ndo, GET_BE_U_2(bp + 22));
310 }
311 break;
312 case PIMV1_TYPE_ASSERT:
313 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 16),
314 GET_IPADDR_STRING(bp + 8));
315 if (GET_BE_U_4(bp + 12) != 0xffffffff)
316 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
317 ND_PRINT(" %s pref %u metric %u",
318 (GET_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT",
319 GET_BE_U_4(bp + 20) & 0x7fffffff,
320 GET_BE_U_4(bp + 24));
321 break;
322 case PIMV1_TYPE_JOIN_PRUNE:
323 case PIMV1_TYPE_GRAFT:
324 case PIMV1_TYPE_GRAFT_ACK:
325 if (ndo->ndo_vflag) {
326 if (len < 8)
327 goto trunc;
328 pimv1_join_prune_print(ndo, bp + 8, len - 8);
329 }
330 break;
331 }
332 if ((GET_U_1(bp + 4) >> 4) != 1)
333 ND_PRINT(" [v%u]", GET_U_1(bp + 4) >> 4);
334 return;
335
336 trunc:
337 nd_print_trunc(ndo);
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_PRINT(" auto-rp ");
358 type = GET_U_1(bp);
359 switch (type) {
360 case 0x11:
361 ND_PRINT("candidate-advert");
362 break;
363 case 0x12:
364 ND_PRINT("mapping");
365 break;
366 default:
367 ND_PRINT("type-0x%02x", type);
368 break;
369 }
370
371 numrps = GET_U_1(bp + 1);
372
373 ND_PRINT(" Hold ");
374 hold = GET_BE_U_2(bp + 2);
375 if (hold)
376 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
377 else
378 ND_PRINT("FOREVER");
379
380 /* Next 4 bytes are reserved. */
381
382 bp += 8; len -= 8;
383
384 /*XXX skip unless -v? */
385
386 /*
387 * Rest of packet:
388 * numrps entries of the form:
389 * 32 bits: RP
390 * 6 bits: reserved
391 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
392 * 8 bits: # of entries for this RP
393 * each entry: 7 bits: reserved, 1 bit: negative,
394 * 8 bits: mask 32 bits: source
395 * lather, rinse, repeat.
396 */
397 while (numrps != 0) {
398 u_int nentries;
399 char s;
400
401 if (len < 4)
402 goto trunc;
403 ND_PRINT(" RP %s", GET_IPADDR_STRING(bp));
404 bp += 4;
405 len -= 4;
406 if (len < 1)
407 goto trunc;
408 switch (GET_U_1(bp) & 0x3) {
409 case 0: ND_PRINT(" PIMv?");
410 break;
411 case 1: ND_PRINT(" PIMv1");
412 break;
413 case 2: ND_PRINT(" PIMv2");
414 break;
415 case 3: ND_PRINT(" PIMv1+2");
416 break;
417 }
418 if (GET_U_1(bp) & 0xfc)
419 ND_PRINT(" [rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
420 bp += 1;
421 len -= 1;
422 if (len < 1)
423 goto trunc;
424 nentries = GET_U_1(bp);
425 bp += 1;
426 len -= 1;
427 s = ' ';
428 while (nentries != 0) {
429 if (len < 6)
430 goto trunc;
431 ND_PRINT("%c%s%s/%u", s, GET_U_1(bp) & 1 ? "!" : "",
432 GET_IPADDR_STRING(bp + 2), GET_U_1(bp + 1));
433 if (GET_U_1(bp) & 0x02) {
434 ND_PRINT(" bidir");
435 }
436 if (GET_U_1(bp) & 0xfc) {
437 ND_PRINT("[rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
438 }
439 s = ',';
440 bp += 6; len -= 6;
441 nentries--;
442 }
443 numrps--;
444 }
445 return;
446
447 trunc:
448 nd_print_trunc(ndo);
449 }
450
451 void
452 pim_print(netdissect_options *ndo,
453 const u_char *bp, u_int len, const u_char *bp2)
454 {
455 const struct pim *pim = (const struct pim *)bp;
456 uint8_t pim_typever;
457
458 ndo->ndo_protocol = "pim";
459
460 pim_typever = GET_U_1(pim->pim_typever);
461 switch (PIM_VER(pim_typever)) {
462 case 2:
463 if (!ndo->ndo_vflag) {
464 ND_PRINT("PIMv%u, %s, length %u",
465 PIM_VER(pim_typever),
466 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)),
467 len);
468 return;
469 } else {
470 ND_PRINT("PIMv%u, length %u\n\t%s",
471 PIM_VER(pim_typever),
472 len,
473 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)));
474 pimv2_print(ndo, bp, len, bp2);
475 }
476 break;
477 default:
478 ND_PRINT("PIMv%u, length %u",
479 PIM_VER(pim_typever),
480 len);
481 break;
482 }
483 }
484
485 /*
486 * PIMv2 uses encoded address representations.
487 *
488 * The last PIM-SM I-D before RFC2117 was published specified the
489 * following representation for unicast addresses. However, RFC2117
490 * specified no encoding for unicast addresses with the unicast
491 * address length specified in the header. Therefore, we have to
492 * guess which encoding is being used (Cisco's PIMv2 implementation
493 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
494 * field into a 'unicast-address-length-in-bytes' field. We guess
495 * that it's the draft encoding if this reserved field is zero.
496 *
497 * RFC2362 goes back to the encoded format, and calls the addr length
498 * field "reserved" again.
499 *
500 * The first byte is the address family, from:
501 *
502 * 0 Reserved
503 * 1 IP (IP version 4)
504 * 2 IP6 (IP version 6)
505 * 3 NSAP
506 * 4 HDLC (8-bit multidrop)
507 * 5 BBN 1822
508 * 6 802 (includes all 802 media plus Ethernet "canonical format")
509 * 7 E.163
510 * 8 E.164 (SMDS, Frame Relay, ATM)
511 * 9 F.69 (Telex)
512 * 10 X.121 (X.25, Frame Relay)
513 * 11 IPX
514 * 12 Appletalk
515 * 13 Decnet IV
516 * 14 Banyan Vines
517 * 15 E.164 with NSAP format subaddress
518 *
519 * In addition, the second byte is an "Encoding". 0 is the default
520 * encoding for the address family, and no other encodings are currently
521 * specified.
522 *
523 */
524
525 enum pimv2_addrtype {
526 pimv2_unicast, pimv2_group, pimv2_source
527 };
528
529 /* 0 1 2 3
530 * 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
531 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
532 * | Addr Family | Encoding Type | Unicast Address |
533 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
534 * 0 1 2 3
535 * 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
536 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
537 * | Addr Family | Encoding Type | Reserved | Mask Len |
538 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
539 * | Group multicast Address |
540 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
541 * 0 1 2 3
542 * 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
543 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
544 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
546 * | Source Address |
547 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
548 */
549 static int
550 pimv2_addr_print(netdissect_options *ndo,
551 const u_char *bp, u_int len, enum pimv2_addrtype at,
552 u_int addr_len, int silent)
553 {
554 u_int af;
555 int hdrlen;
556
557 if (addr_len == 0) {
558 if (len < 2)
559 goto trunc;
560 switch (GET_U_1(bp)) {
561 case 1:
562 af = AF_INET;
563 addr_len = (u_int)sizeof(nd_ipv4);
564 break;
565 case 2:
566 af = AF_INET6;
567 addr_len = (u_int)sizeof(nd_ipv6);
568 break;
569 default:
570 return -1;
571 }
572 if (GET_U_1(bp + 1) != 0)
573 return -1;
574 hdrlen = 2;
575 } else {
576 switch (addr_len) {
577 case sizeof(nd_ipv4):
578 af = AF_INET;
579 break;
580 case sizeof(nd_ipv6):
581 af = AF_INET6;
582 break;
583 default:
584 return -1;
585 break;
586 }
587 hdrlen = 0;
588 }
589
590 bp += hdrlen;
591 len -= hdrlen;
592 switch (at) {
593 case pimv2_unicast:
594 if (len < addr_len)
595 goto trunc;
596 ND_TCHECK_LEN(bp, addr_len);
597 if (af == AF_INET) {
598 if (!silent)
599 ND_PRINT("%s", GET_IPADDR_STRING(bp));
600 } else if (af == AF_INET6) {
601 if (!silent)
602 ND_PRINT("%s", GET_IP6ADDR_STRING(bp));
603 }
604 return hdrlen + addr_len;
605 case pimv2_group:
606 case pimv2_source:
607 if (len < addr_len + 2)
608 goto trunc;
609 ND_TCHECK_LEN(bp, addr_len + 2);
610 if (af == AF_INET) {
611 if (!silent) {
612 ND_PRINT("%s", GET_IPADDR_STRING(bp + 2));
613 if (GET_U_1(bp + 1) != 32)
614 ND_PRINT("/%u", GET_U_1(bp + 1));
615 }
616 } else if (af == AF_INET6) {
617 if (!silent) {
618 ND_PRINT("%s", GET_IP6ADDR_STRING(bp + 2));
619 if (GET_U_1(bp + 1) != 128)
620 ND_PRINT("/%u", GET_U_1(bp + 1));
621 }
622 }
623 if (GET_U_1(bp) && !silent) {
624 if (at == pimv2_group) {
625 ND_PRINT("(0x%02x)", GET_U_1(bp));
626 } else {
627 ND_PRINT("(%s%s%s",
628 GET_U_1(bp) & 0x04 ? "S" : "",
629 GET_U_1(bp) & 0x02 ? "W" : "",
630 GET_U_1(bp) & 0x01 ? "R" : "");
631 if (GET_U_1(bp) & 0xf8) {
632 ND_PRINT("+0x%02x",
633 GET_U_1(bp) & 0xf8);
634 }
635 ND_PRINT(")");
636 }
637 }
638 return hdrlen + 2 + addr_len;
639 default:
640 return -1;
641 }
642 trunc:
643 return -1;
644 }
645
646 enum checksum_status {
647 CORRECT,
648 INCORRECT,
649 UNVERIFIED
650 };
651
652 static enum checksum_status
653 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
654 const u_char *bp2, u_int len)
655 {
656 const struct ip *ip;
657 u_int cksum;
658
659 if (!ND_TTEST_LEN(bp, len)) {
660 /* We don't have all the data. */
661 return (UNVERIFIED);
662 }
663 ip = (const struct ip *)bp2;
664 if (IP_V(ip) == 4) {
665 struct cksum_vec vec[1];
666
667 vec[0].ptr = bp;
668 vec[0].len = len;
669 cksum = in_cksum(vec, 1);
670 return (cksum ? INCORRECT : CORRECT);
671 } else if (IP_V(ip) == 6) {
672 const struct ip6_hdr *ip6;
673
674 ip6 = (const struct ip6_hdr *)bp2;
675 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
676 return (cksum ? INCORRECT : CORRECT);
677 } else {
678 return (UNVERIFIED);
679 }
680 }
681
682 static void
683 pimv2_print(netdissect_options *ndo,
684 const u_char *bp, u_int len, const u_char *bp2)
685 {
686 const struct pim *pim = (const struct pim *)bp;
687 int advance;
688 int subtype;
689 enum checksum_status cksum_status;
690 u_int pim_typever;
691 u_int pimv2_addr_len;
692
693 ndo->ndo_protocol = "pimv2";
694 if (len < 2) {
695 ND_PRINT("[length %u < 2]", len);
696 nd_print_invalid(ndo);
697 return;
698 }
699 pim_typever = GET_U_1(pim->pim_typever);
700 /* RFC5015 allocates the high 4 bits of pim_rsv for "subtype". */
701 pimv2_addr_len = GET_U_1(pim->pim_rsv) & 0x0f;
702 if (pimv2_addr_len != 0)
703 ND_PRINT(", RFC2117-encoding");
704
705 if (len < 4) {
706 ND_PRINT("[length %u < 4]", len);
707 nd_print_invalid(ndo);
708 return;
709 }
710 ND_PRINT(", cksum 0x%04x ", GET_BE_U_2(pim->pim_cksum));
711 if (GET_BE_U_2(pim->pim_cksum) == 0) {
712 ND_PRINT("(unverified)");
713 } else {
714 if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) {
715 /*
716 * The checksum only covers the packet header,
717 * not the encapsulated packet.
718 */
719 cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
720 if (cksum_status == INCORRECT) {
721 /*
722 * To quote RFC 4601, "For interoperability
723 * reasons, a message carrying a checksum
724 * calculated over the entire PIM Register
725 * message should also be accepted."
726 */
727 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
728 }
729 } else {
730 /*
731 * The checksum covers the entire packet.
732 */
733 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
734 }
735 switch (cksum_status) {
736
737 case CORRECT:
738 ND_PRINT("(correct)");
739 break;
740
741 case INCORRECT:
742 ND_PRINT("(incorrect)");
743 break;
744
745 case UNVERIFIED:
746 ND_PRINT("(unverified)");
747 break;
748 }
749 }
750 bp += 4;
751 len -= 4;
752
753 switch (PIM_TYPE(pim_typever)) {
754 case PIMV2_TYPE_HELLO:
755 {
756 uint16_t otype, olen;
757 while (len > 0) {
758 if (len < 4)
759 goto trunc;
760 otype = GET_BE_U_2(bp);
761 olen = GET_BE_U_2(bp + 2);
762 ND_PRINT("\n\t %s Option (%u), length %u, Value: ",
763 tok2str(pimv2_hello_option_values, "Unknown", otype),
764 otype,
765 olen);
766 bp += 4;
767 len -= 4;
768
769 if (len < olen)
770 goto trunc;
771 ND_TCHECK_LEN(bp, olen);
772 switch (otype) {
773 case PIMV2_HELLO_OPTION_HOLDTIME:
774 if (olen != 2) {
775 ND_PRINT("[option length %u != 2]", olen);
776 nd_print_invalid(ndo);
777 return;
778 } else {
779 unsigned_relts_print(ndo,
780 GET_BE_U_2(bp));
781 }
782 break;
783
784 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
785 if (olen != 4) {
786 ND_PRINT("[option length %u != 4]", olen);
787 nd_print_invalid(ndo);
788 return;
789 } else {
790 char t_bit;
791 uint16_t lan_delay, override_interval;
792 lan_delay = GET_BE_U_2(bp);
793 override_interval = GET_BE_U_2(bp + 2);
794 t_bit = (lan_delay & 0x8000)? 1 : 0;
795 lan_delay &= ~0x8000;
796 ND_PRINT("\n\t T-bit=%u, LAN delay %ums, Override interval %ums",
797 t_bit, lan_delay, override_interval);
798 }
799 break;
800
801 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
802 case PIMV2_HELLO_OPTION_DR_PRIORITY:
803 switch (olen) {
804 case 0:
805 ND_PRINT("Bi-Directional Capability (Old)");
806 break;
807 case 4:
808 ND_PRINT("%u", GET_BE_U_4(bp));
809 break;
810 default:
811 ND_PRINT("[option length %u != 4]", olen);
812 nd_print_invalid(ndo);
813 return;
814 break;
815 }
816 break;
817
818 case PIMV2_HELLO_OPTION_GENID:
819 if (olen != 4) {
820 ND_PRINT("[option length %u != 4]", olen);
821 nd_print_invalid(ndo);
822 return;
823 } else {
824 ND_PRINT("0x%08x", GET_BE_U_4(bp));
825 }
826 break;
827
828 case PIMV2_HELLO_OPTION_REFRESH_CAP:
829 if (olen != 4) {
830 ND_PRINT("[option length %u != 4]", olen);
831 nd_print_invalid(ndo);
832 return;
833 } else {
834 ND_PRINT("v%u", GET_U_1(bp));
835 if (GET_U_1(bp + 1) != 0) {
836 ND_PRINT(", interval ");
837 unsigned_relts_print(ndo,
838 GET_U_1(bp + 1));
839 }
840 if (GET_BE_U_2(bp + 2) != 0) {
841 ND_PRINT(" ?0x%04x?",
842 GET_BE_U_2(bp + 2));
843 }
844 }
845 break;
846
847 case PIMV2_HELLO_OPTION_BIDIR_CAP:
848 break;
849
850 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
851 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
852 if (ndo->ndo_vflag > 1) {
853 const u_char *ptr = bp;
854 u_int plen = len;
855 while (ptr < (bp+olen)) {
856 ND_PRINT("\n\t ");
857 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
858 if (advance < 0)
859 goto trunc;
860 ptr += advance;
861 plen -= advance;
862 }
863 }
864 break;
865 default:
866 if (ndo->ndo_vflag <= 1)
867 print_unknown_data(ndo, bp, "\n\t ", olen);
868 break;
869 }
870 /* do we want to see an additionally hexdump ? */
871 if (ndo->ndo_vflag> 1)
872 print_unknown_data(ndo, bp, "\n\t ", olen);
873 bp += olen;
874 len -= olen;
875 }
876 break;
877 }
878
879 case PIMV2_TYPE_REGISTER:
880 {
881 const struct ip *ip;
882
883 if (len < 4)
884 goto trunc;
885 ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN);
886
887 ND_PRINT(", Flags [ %s ]\n\t",
888 tok2str(pimv2_register_flag_values,
889 "none",
890 GET_BE_U_4(bp)));
891
892 bp += 4; len -= 4;
893 /* encapsulated multicast packet */
894 if (len == 0)
895 goto trunc;
896 ip = (const struct ip *)bp;
897 switch (IP_V(ip)) {
898 case 0: /* Null header */
899 ND_PRINT("IP-Null-header %s > %s",
900 GET_IPADDR_STRING(ip->ip_src),
901 GET_IPADDR_STRING(ip->ip_dst));
902 break;
903
904 case 4: /* IPv4 */
905 ip_print(ndo, bp, len);
906 break;
907
908 case 6: /* IPv6 */
909 ip6_print(ndo, bp, len);
910 break;
911
912 default:
913 ND_PRINT("IP ver %u", IP_V(ip));
914 break;
915 }
916 break;
917 }
918
919 case PIMV2_TYPE_REGISTER_STOP:
920 ND_PRINT(" group=");
921 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
922 goto trunc;
923 bp += advance; len -= advance;
924 ND_PRINT(" source=");
925 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
926 goto trunc;
927 bp += advance; len -= advance;
928 break;
929
930 case PIMV2_TYPE_JOIN_PRUNE:
931 case PIMV2_TYPE_GRAFT:
932 case PIMV2_TYPE_GRAFT_ACK:
933
934
935 /*
936 * 0 1 2 3
937 * 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
938 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
939 * |PIM Ver| Type | Addr length | Checksum |
940 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
941 * | Unicast-Upstream Neighbor Address |
942 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
943 * | Reserved | Num groups | Holdtime |
944 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
945 * | Encoded-Multicast Group Address-1 |
946 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
947 * | Number of Joined Sources | Number of Pruned Sources |
948 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
949 * | Encoded-Joined Source Address-1 |
950 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
951 * | . |
952 * | . |
953 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
954 * | Encoded-Joined Source Address-n |
955 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
956 * | Encoded-Pruned Source Address-1 |
957 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
958 * | . |
959 * | . |
960 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
961 * | Encoded-Pruned Source Address-n |
962 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
963 * | . |
964 * | . |
965 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
966 * | Encoded-Multicast Group Address-n |
967 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
968 */
969
970 {
971 uint8_t ngroup;
972 uint16_t holdtime;
973 uint16_t njoin;
974 uint16_t nprune;
975 u_int i, j;
976
977 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
978 ND_PRINT(", upstream-neighbor: ");
979 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
980 goto trunc;
981 bp += advance; len -= advance;
982 }
983 if (len < 4)
984 goto trunc;
985 ND_TCHECK_4(bp);
986 ngroup = GET_U_1(bp + 1);
987 holdtime = GET_BE_U_2(bp + 2);
988 ND_PRINT("\n\t %u group(s)", ngroup);
989 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
990 ND_PRINT(", holdtime: ");
991 if (holdtime == 0xffff)
992 ND_PRINT("infinite");
993 else
994 unsigned_relts_print(ndo, holdtime);
995 }
996 bp += 4; len -= 4;
997 for (i = 0; i < ngroup; i++) {
998 ND_PRINT("\n\t group #%u: ", i+1);
999 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1000 goto trunc;
1001 bp += advance; len -= advance;
1002 if (len < 4)
1003 goto trunc;
1004 ND_TCHECK_4(bp);
1005 njoin = GET_BE_U_2(bp);
1006 nprune = GET_BE_U_2(bp + 2);
1007 ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune);
1008 bp += 4; len -= 4;
1009 for (j = 0; j < njoin; j++) {
1010 ND_PRINT("\n\t joined source #%u: ", j+1);
1011 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1012 goto trunc;
1013 bp += advance; len -= advance;
1014 }
1015 for (j = 0; j < nprune; j++) {
1016 ND_PRINT("\n\t pruned source #%u: ", j+1);
1017 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1018 goto trunc;
1019 bp += advance; len -= advance;
1020 }
1021 }
1022 break;
1023 }
1024
1025 case PIMV2_TYPE_BOOTSTRAP:
1026 {
1027 u_int i, j, frpcnt;
1028
1029 /* Fragment Tag, Hash Mask len, and BSR-priority */
1030 if (len < 2)
1031 goto trunc;
1032 ND_PRINT(" tag=%x", GET_BE_U_2(bp));
1033 bp += 2;
1034 len -= 2;
1035 if (len < 1)
1036 goto trunc;
1037 ND_PRINT(" hashmlen=%u", GET_U_1(bp));
1038 if (len < 2)
1039 goto trunc;
1040 ND_TCHECK_1(bp + 2);
1041 ND_PRINT(" BSRprio=%u", GET_U_1(bp + 1));
1042 bp += 2;
1043 len -= 2;
1044
1045 /* Encoded-Unicast-BSR-Address */
1046 ND_PRINT(" BSR=");
1047 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1048 goto trunc;
1049 bp += advance;
1050 len -= advance;
1051
1052 for (i = 0; len > 0; i++) {
1053 /* Encoded-Group Address */
1054 ND_PRINT(" (group%u: ", i);
1055 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1056 goto trunc;
1057 bp += advance;
1058 len -= advance;
1059
1060 /* RP-Count, Frag RP-Cnt, and rsvd */
1061 if (len < 1)
1062 goto trunc;
1063 ND_PRINT(" RPcnt=%u", GET_U_1(bp));
1064 if (len < 2)
1065 goto trunc;
1066 frpcnt = GET_U_1(bp + 1);
1067 ND_PRINT(" FRPcnt=%u", frpcnt);
1068 if (len < 4)
1069 goto trunc;
1070 bp += 4;
1071 len -= 4;
1072
1073 for (j = 0; j < frpcnt && len > 0; j++) {
1074 /* each RP info */
1075 ND_PRINT(" RP%u=", j);
1076 if ((advance = pimv2_addr_print(ndo, bp, len,
1077 pimv2_unicast,
1078 pimv2_addr_len,
1079 0)) < 0)
1080 goto trunc;
1081 bp += advance;
1082 len -= advance;
1083
1084 if (len < 2)
1085 goto trunc;
1086 ND_PRINT(",holdtime=");
1087 unsigned_relts_print(ndo,
1088 GET_BE_U_2(bp));
1089 if (len < 3)
1090 goto trunc;
1091 ND_PRINT(",prio=%u", GET_U_1(bp + 2));
1092 if (len < 4)
1093 goto trunc;
1094 bp += 4;
1095 len -= 4;
1096 }
1097 ND_PRINT(")");
1098 }
1099 break;
1100 }
1101 case PIMV2_TYPE_ASSERT:
1102 ND_PRINT(" group=");
1103 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1104 goto trunc;
1105 bp += advance; len -= advance;
1106 ND_PRINT(" src=");
1107 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1108 goto trunc;
1109 bp += advance; len -= advance;
1110 if (len < 8)
1111 goto trunc;
1112 ND_TCHECK_8(bp);
1113 if (GET_U_1(bp) & 0x80)
1114 ND_PRINT(" RPT");
1115 ND_PRINT(" pref=%u", GET_BE_U_4(bp) & 0x7fffffff);
1116 ND_PRINT(" metric=%u", GET_BE_U_4(bp + 4));
1117 break;
1118
1119 case PIMV2_TYPE_CANDIDATE_RP:
1120 {
1121 u_int i, pfxcnt;
1122
1123 /* Prefix-Cnt, Priority, and Holdtime */
1124 if (len < 1)
1125 goto trunc;
1126 ND_PRINT(" prefix-cnt=%u", GET_U_1(bp));
1127 pfxcnt = GET_U_1(bp);
1128 if (len < 2)
1129 goto trunc;
1130 ND_PRINT(" prio=%u", GET_U_1(bp + 1));
1131 if (len < 4)
1132 goto trunc;
1133 ND_PRINT(" holdtime=");
1134 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
1135 bp += 4;
1136 len -= 4;
1137
1138 /* Encoded-Unicast-RP-Address */
1139 ND_PRINT(" RP=");
1140 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1141 goto trunc;
1142 bp += advance;
1143 len -= advance;
1144
1145 /* Encoded-Group Addresses */
1146 for (i = 0; i < pfxcnt && len > 0; i++) {
1147 ND_PRINT(" Group%u=", i);
1148 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1149 goto trunc;
1150 bp += advance;
1151 len -= advance;
1152 }
1153 break;
1154 }
1155
1156 case PIMV2_TYPE_PRUNE_REFRESH:
1157 ND_PRINT(" src=");
1158 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1159 goto trunc;
1160 bp += advance;
1161 len -= advance;
1162 ND_PRINT(" grp=");
1163 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1164 goto trunc;
1165 bp += advance;
1166 len -= advance;
1167 ND_PRINT(" forwarder=");
1168 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1169 goto trunc;
1170 bp += advance;
1171 len -= advance;
1172 if (len < 2)
1173 goto trunc;
1174 ND_PRINT(" TUNR ");
1175 unsigned_relts_print(ndo, GET_BE_U_2(bp));
1176 break;
1177
1178 case PIMV2_TYPE_DF_ELECTION:
1179 subtype = PIM_SUBTYPE(GET_U_1(pim->pim_rsv));
1180 ND_PRINT("\n\t %s,", tok2str( pimv2_df_election_flag_values,
1181 "Unknown", subtype) );
1182
1183 ND_PRINT(" rpa=");
1184 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1185 goto trunc;
1186 }
1187 bp += advance;
1188 len -= advance;
1189 ND_PRINT(" sender pref=%u", GET_BE_U_4(bp) );
1190 ND_PRINT(" sender metric=%u", GET_BE_U_4(bp + 4));
1191
1192 bp += 8;
1193 len -= 8;
1194
1195 switch (subtype) {
1196 case PIMV2_DF_ELECTION_BACKOFF:
1197 case PIMV2_DF_ELECTION_PASS:
1198 ND_PRINT("\n\t %s addr=", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype));
1199 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1200 goto trunc;
1201 }
1202 bp += advance;
1203 len -= advance;
1204
1205 ND_PRINT(" %s pref=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp) );
1206 ND_PRINT(" %s metric=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp + 4));
1207
1208 bp += 8;
1209 len -= 8;
1210
1211 if (subtype == PIMV2_DF_ELECTION_BACKOFF) {
1212 ND_PRINT(" interval %dms", GET_BE_U_2(bp));
1213 }
1214
1215 break;
1216 default:
1217 break;
1218 }
1219 break;
1220
1221 default:
1222 ND_PRINT(" [type %u]", PIM_TYPE(pim_typever));
1223 break;
1224 }
1225
1226 return;
1227
1228 trunc:
1229 nd_print_trunc(ndo);
1230 }
[mirror] the TCPdump network dissector