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[tcpdump] / print-pim.c
1 /*
2 * Copyright (c) 1995, 1996
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22 /* \summary: Protocol Independent Multicast (PIM) printer */
23
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27
28 #include "netdissect-stdinc.h"
29
30 #include "netdissect.h"
31 #include "addrtoname.h"
32 #include "extract.h"
33
34 #include "ip.h"
35 #include "ip6.h"
36 #include "ipproto.h"
37
38 #define PIMV1_TYPE_QUERY 0
39 #define PIMV1_TYPE_REGISTER 1
40 #define PIMV1_TYPE_REGISTER_STOP 2
41 #define PIMV1_TYPE_JOIN_PRUNE 3
42 #define PIMV1_TYPE_RP_REACHABILITY 4
43 #define PIMV1_TYPE_ASSERT 5
44 #define PIMV1_TYPE_GRAFT 6
45 #define PIMV1_TYPE_GRAFT_ACK 7
46
47 static const struct tok pimv1_type_str[] = {
48 { PIMV1_TYPE_QUERY, "Query" },
49 { PIMV1_TYPE_REGISTER, "Register" },
50 { PIMV1_TYPE_REGISTER_STOP, "Register-Stop" },
51 { PIMV1_TYPE_JOIN_PRUNE, "Join/Prune" },
52 { PIMV1_TYPE_RP_REACHABILITY, "RP-reachable" },
53 { PIMV1_TYPE_ASSERT, "Assert" },
54 { PIMV1_TYPE_GRAFT, "Graft" },
55 { PIMV1_TYPE_GRAFT_ACK, "Graft-ACK" },
56 { 0, NULL }
57 };
58
59 #define PIMV2_TYPE_HELLO 0
60 #define PIMV2_TYPE_REGISTER 1
61 #define PIMV2_TYPE_REGISTER_STOP 2
62 #define PIMV2_TYPE_JOIN_PRUNE 3
63 #define PIMV2_TYPE_BOOTSTRAP 4
64 #define PIMV2_TYPE_ASSERT 5
65 #define PIMV2_TYPE_GRAFT 6
66 #define PIMV2_TYPE_GRAFT_ACK 7
67 #define PIMV2_TYPE_CANDIDATE_RP 8
68 #define PIMV2_TYPE_PRUNE_REFRESH 9
69 #define PIMV2_TYPE_DF_ELECTION 10
70 #define PIMV2_TYPE_ECMP_REDIRECT 11
71
72 static const struct tok pimv2_type_values[] = {
73 { PIMV2_TYPE_HELLO, "Hello" },
74 { PIMV2_TYPE_REGISTER, "Register" },
75 { PIMV2_TYPE_REGISTER_STOP, "Register Stop" },
76 { PIMV2_TYPE_JOIN_PRUNE, "Join / Prune" },
77 { PIMV2_TYPE_BOOTSTRAP, "Bootstrap" },
78 { PIMV2_TYPE_ASSERT, "Assert" },
79 { PIMV2_TYPE_GRAFT, "Graft" },
80 { PIMV2_TYPE_GRAFT_ACK, "Graft Acknowledgement" },
81 { PIMV2_TYPE_CANDIDATE_RP, "Candidate RP Advertisement" },
82 { PIMV2_TYPE_PRUNE_REFRESH, "Prune Refresh" },
83 { PIMV2_TYPE_DF_ELECTION, "DF Election" },
84 { PIMV2_TYPE_ECMP_REDIRECT, "ECMP Redirect" },
85 { 0, NULL}
86 };
87
88 #define PIMV2_HELLO_OPTION_HOLDTIME 1
89 #define PIMV2_HELLO_OPTION_LANPRUNEDELAY 2
90 #define PIMV2_HELLO_OPTION_DR_PRIORITY_OLD 18
91 #define PIMV2_HELLO_OPTION_DR_PRIORITY 19
92 #define PIMV2_HELLO_OPTION_GENID 20
93 #define PIMV2_HELLO_OPTION_REFRESH_CAP 21
94 #define PIMV2_HELLO_OPTION_BIDIR_CAP 22
95 #define PIMV2_HELLO_OPTION_ADDRESS_LIST 24
96 #define PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD 65001
97
98 static const struct tok pimv2_hello_option_values[] = {
99 { PIMV2_HELLO_OPTION_HOLDTIME, "Hold Time" },
100 { PIMV2_HELLO_OPTION_LANPRUNEDELAY, "LAN Prune Delay" },
101 { PIMV2_HELLO_OPTION_DR_PRIORITY_OLD, "DR Priority (Old)" },
102 { PIMV2_HELLO_OPTION_DR_PRIORITY, "DR Priority" },
103 { PIMV2_HELLO_OPTION_GENID, "Generation ID" },
104 { PIMV2_HELLO_OPTION_REFRESH_CAP, "State Refresh Capability" },
105 { PIMV2_HELLO_OPTION_BIDIR_CAP, "Bi-Directional Capability" },
106 { PIMV2_HELLO_OPTION_ADDRESS_LIST, "Address List" },
107 { PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD, "Address List (Old)" },
108 { 0, NULL}
109 };
110
111 #define PIMV2_REGISTER_FLAG_LEN 4
112 #define PIMV2_REGISTER_FLAG_BORDER 0x80000000
113 #define PIMV2_REGISTER_FLAG_NULL 0x40000000
114
115 static const struct tok pimv2_register_flag_values[] = {
116 { PIMV2_REGISTER_FLAG_BORDER, "Border" },
117 { PIMV2_REGISTER_FLAG_NULL, "Null" },
118 { 0, NULL}
119 };
120
121 #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 defintions 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 return;
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_TCHECK_2(bp + 22);
309 ND_PRINT(" group %s", GET_IPADDR_STRING(bp + 8));
310 if (GET_BE_U_4(bp + 12) != 0xffffffff)
311 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
312 ND_PRINT(" RP %s hold ", GET_IPADDR_STRING(bp + 16));
313 unsigned_relts_print(ndo, GET_BE_U_2(bp + 22));
314 }
315 break;
316 case PIMV1_TYPE_ASSERT:
317 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 16),
318 GET_IPADDR_STRING(bp + 8));
319 if (GET_BE_U_4(bp + 12) != 0xffffffff)
320 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
321 ND_PRINT(" %s pref %u metric %u",
322 (GET_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT",
323 GET_BE_U_4(bp + 20) & 0x7fffffff,
324 GET_BE_U_4(bp + 24));
325 break;
326 case PIMV1_TYPE_JOIN_PRUNE:
327 case PIMV1_TYPE_GRAFT:
328 case PIMV1_TYPE_GRAFT_ACK:
329 if (ndo->ndo_vflag) {
330 if (len < 8)
331 goto trunc;
332 pimv1_join_prune_print(ndo, bp + 8, len - 8);
333 }
334 break;
335 }
336 if ((GET_U_1(bp + 4) >> 4) != 1)
337 ND_PRINT(" [v%u]", GET_U_1(bp + 4) >> 4);
338 return;
339
340 trunc:
341 nd_print_trunc(ndo);
342 return;
343 }
344
345 /*
346 * auto-RP is a cisco protocol, documented at
347 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
348 *
349 * This implements version 1+, dated Sept 9, 1998.
350 */
351 void
352 cisco_autorp_print(netdissect_options *ndo,
353 const u_char *bp, u_int len)
354 {
355 u_int type;
356 u_int numrps;
357 u_int hold;
358
359 ndo->ndo_protocol = "cisco_autorp";
360 if (len < 8)
361 goto trunc;
362 ND_PRINT(" auto-rp ");
363 type = GET_U_1(bp);
364 switch (type) {
365 case 0x11:
366 ND_PRINT("candidate-advert");
367 break;
368 case 0x12:
369 ND_PRINT("mapping");
370 break;
371 default:
372 ND_PRINT("type-0x%02x", type);
373 break;
374 }
375
376 numrps = GET_U_1(bp + 1);
377
378 ND_PRINT(" Hold ");
379 hold = GET_BE_U_2(bp + 2);
380 if (hold)
381 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
382 else
383 ND_PRINT("FOREVER");
384
385 /* Next 4 bytes are reserved. */
386
387 bp += 8; len -= 8;
388
389 /*XXX skip unless -v? */
390
391 /*
392 * Rest of packet:
393 * numrps entries of the form:
394 * 32 bits: RP
395 * 6 bits: reserved
396 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
397 * 8 bits: # of entries for this RP
398 * each entry: 7 bits: reserved, 1 bit: negative,
399 * 8 bits: mask 32 bits: source
400 * lather, rinse, repeat.
401 */
402 while (numrps != 0) {
403 u_int nentries;
404 char s;
405
406 if (len < 4)
407 goto trunc;
408 ND_PRINT(" RP %s", GET_IPADDR_STRING(bp));
409 bp += 4;
410 len -= 4;
411 if (len < 1)
412 goto trunc;
413 switch (GET_U_1(bp) & 0x3) {
414 case 0: ND_PRINT(" PIMv?");
415 break;
416 case 1: ND_PRINT(" PIMv1");
417 break;
418 case 2: ND_PRINT(" PIMv2");
419 break;
420 case 3: ND_PRINT(" PIMv1+2");
421 break;
422 }
423 if (GET_U_1(bp) & 0xfc)
424 ND_PRINT(" [rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
425 bp += 1;
426 len -= 1;
427 if (len < 1)
428 goto trunc;
429 nentries = GET_U_1(bp);
430 bp += 1;
431 len -= 1;
432 s = ' ';
433 while (nentries != 0) {
434 if (len < 6)
435 goto trunc;
436 ND_PRINT("%c%s%s/%u", s, GET_U_1(bp) & 1 ? "!" : "",
437 GET_IPADDR_STRING(bp + 2), GET_U_1(bp + 1));
438 if (GET_U_1(bp) & 0x02) {
439 ND_PRINT(" bidir");
440 }
441 if (GET_U_1(bp) & 0xfc) {
442 ND_PRINT("[rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
443 }
444 s = ',';
445 bp += 6; len -= 6;
446 nentries--;
447 }
448 numrps--;
449 }
450 return;
451
452 trunc:
453 nd_print_trunc(ndo);
454 return;
455 }
456
457 void
458 pim_print(netdissect_options *ndo,
459 const u_char *bp, u_int len, const u_char *bp2)
460 {
461 const struct pim *pim = (const struct pim *)bp;
462 uint8_t pim_typever;
463
464 ndo->ndo_protocol = "pim";
465
466 pim_typever = GET_U_1(pim->pim_typever);
467 switch (PIM_VER(pim_typever)) {
468 case 2:
469 if (!ndo->ndo_vflag) {
470 ND_PRINT("PIMv%u, %s, length %u",
471 PIM_VER(pim_typever),
472 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)),
473 len);
474 return;
475 } else {
476 ND_PRINT("PIMv%u, length %u\n\t%s",
477 PIM_VER(pim_typever),
478 len,
479 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)));
480 pimv2_print(ndo, bp, len, bp2);
481 }
482 break;
483 default:
484 ND_PRINT("PIMv%u, length %u",
485 PIM_VER(pim_typever),
486 len);
487 break;
488 }
489 }
490
491 /*
492 * PIMv2 uses encoded address representations.
493 *
494 * The last PIM-SM I-D before RFC2117 was published specified the
495 * following representation for unicast addresses. However, RFC2117
496 * specified no encoding for unicast addresses with the unicast
497 * address length specified in the header. Therefore, we have to
498 * guess which encoding is being used (Cisco's PIMv2 implementation
499 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
500 * field into a 'unicast-address-length-in-bytes' field. We guess
501 * that it's the draft encoding if this reserved field is zero.
502 *
503 * RFC2362 goes back to the encoded format, and calls the addr length
504 * field "reserved" again.
505 *
506 * The first byte is the address family, from:
507 *
508 * 0 Reserved
509 * 1 IP (IP version 4)
510 * 2 IP6 (IP version 6)
511 * 3 NSAP
512 * 4 HDLC (8-bit multidrop)
513 * 5 BBN 1822
514 * 6 802 (includes all 802 media plus Ethernet "canonical format")
515 * 7 E.163
516 * 8 E.164 (SMDS, Frame Relay, ATM)
517 * 9 F.69 (Telex)
518 * 10 X.121 (X.25, Frame Relay)
519 * 11 IPX
520 * 12 Appletalk
521 * 13 Decnet IV
522 * 14 Banyan Vines
523 * 15 E.164 with NSAP format subaddress
524 *
525 * In addition, the second byte is an "Encoding". 0 is the default
526 * encoding for the address family, and no other encodings are currently
527 * specified.
528 *
529 */
530
531 enum pimv2_addrtype {
532 pimv2_unicast, pimv2_group, pimv2_source
533 };
534
535 /* 0 1 2 3
536 * 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
537 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
538 * | Addr Family | Encoding Type | Unicast Address |
539 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
540 * 0 1 2 3
541 * 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
542 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
543 * | Addr Family | Encoding Type | Reserved | Mask Len |
544 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
545 * | Group multicast Address |
546 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
547 * 0 1 2 3
548 * 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
549 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
550 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
551 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
552 * | Source Address |
553 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
554 */
555 static int
556 pimv2_addr_print(netdissect_options *ndo,
557 const u_char *bp, u_int len, enum pimv2_addrtype at,
558 u_int addr_len, int silent)
559 {
560 u_int af;
561 int hdrlen;
562
563 if (addr_len == 0) {
564 if (len < 2)
565 goto trunc;
566 switch (GET_U_1(bp)) {
567 case 1:
568 af = AF_INET;
569 addr_len = (u_int)sizeof(nd_ipv4);
570 break;
571 case 2:
572 af = AF_INET6;
573 addr_len = (u_int)sizeof(nd_ipv6);
574 break;
575 default:
576 return -1;
577 }
578 if (GET_U_1(bp + 1) != 0)
579 return -1;
580 hdrlen = 2;
581 } else {
582 switch (addr_len) {
583 case sizeof(nd_ipv4):
584 af = AF_INET;
585 break;
586 case sizeof(nd_ipv6):
587 af = AF_INET6;
588 break;
589 default:
590 return -1;
591 break;
592 }
593 hdrlen = 0;
594 }
595
596 bp += hdrlen;
597 len -= hdrlen;
598 switch (at) {
599 case pimv2_unicast:
600 if (len < addr_len)
601 goto trunc;
602 ND_TCHECK_LEN(bp, addr_len);
603 if (af == AF_INET) {
604 if (!silent)
605 ND_PRINT("%s", GET_IPADDR_STRING(bp));
606 }
607 else if (af == AF_INET6) {
608 if (!silent)
609 ND_PRINT("%s", GET_IP6ADDR_STRING(bp));
610 }
611 return hdrlen + addr_len;
612 case pimv2_group:
613 case pimv2_source:
614 if (len < addr_len + 2)
615 goto trunc;
616 ND_TCHECK_LEN(bp, addr_len + 2);
617 if (af == AF_INET) {
618 if (!silent) {
619 ND_PRINT("%s", GET_IPADDR_STRING(bp + 2));
620 if (GET_U_1(bp + 1) != 32)
621 ND_PRINT("/%u", GET_U_1(bp + 1));
622 }
623 }
624 else if (af == AF_INET6) {
625 if (!silent) {
626 ND_PRINT("%s", GET_IP6ADDR_STRING(bp + 2));
627 if (GET_U_1(bp + 1) != 128)
628 ND_PRINT("/%u", GET_U_1(bp + 1));
629 }
630 }
631 if (GET_U_1(bp) && !silent) {
632 if (at == pimv2_group) {
633 ND_PRINT("(0x%02x)", GET_U_1(bp));
634 } else {
635 ND_PRINT("(%s%s%s",
636 GET_U_1(bp) & 0x04 ? "S" : "",
637 GET_U_1(bp) & 0x02 ? "W" : "",
638 GET_U_1(bp) & 0x01 ? "R" : "");
639 if (GET_U_1(bp) & 0xf8) {
640 ND_PRINT("+0x%02x",
641 GET_U_1(bp) & 0xf8);
642 }
643 ND_PRINT(")");
644 }
645 }
646 return hdrlen + 2 + addr_len;
647 default:
648 return -1;
649 }
650 trunc:
651 return -1;
652 }
653
654 enum checksum_status {
655 CORRECT,
656 INCORRECT,
657 UNVERIFIED
658 };
659
660 static enum checksum_status
661 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
662 const u_char *bp2, u_int len)
663 {
664 const struct ip *ip;
665 u_int cksum;
666
667 if (!ND_TTEST_LEN(bp, len)) {
668 /* We don't have all the data. */
669 return (UNVERIFIED);
670 }
671 ip = (const struct ip *)bp2;
672 if (IP_V(ip) == 4) {
673 struct cksum_vec vec[1];
674
675 vec[0].ptr = bp;
676 vec[0].len = len;
677 cksum = in_cksum(vec, 1);
678 return (cksum ? INCORRECT : CORRECT);
679 } else if (IP_V(ip) == 6) {
680 const struct ip6_hdr *ip6;
681
682 ip6 = (const struct ip6_hdr *)bp2;
683 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
684 return (cksum ? INCORRECT : CORRECT);
685 } else {
686 return (UNVERIFIED);
687 }
688 }
689
690 static void
691 pimv2_print(netdissect_options *ndo,
692 const u_char *bp, u_int len, const u_char *bp2)
693 {
694 const struct pim *pim = (const struct pim *)bp;
695 int advance;
696 int subtype;
697 enum checksum_status cksum_status;
698 u_int pim_typever;
699 u_int pimv2_addr_len;
700
701 ndo->ndo_protocol = "pimv2";
702 if (len < 2) {
703 ND_PRINT("[length %u < 2]", len);
704 nd_print_invalid(ndo);
705 return;
706 }
707 pim_typever = GET_U_1(pim->pim_typever);
708 /* RFC5015 allocates the high 4 bits of pim_rsv for "subtype". */
709 pimv2_addr_len = GET_U_1(pim->pim_rsv) & 0x0f;
710 if (pimv2_addr_len != 0)
711 ND_PRINT(", RFC2117-encoding");
712
713 if (len < 4) {
714 ND_PRINT("[length %u < 4]", len);
715 nd_print_invalid(ndo);
716 return;
717 }
718 ND_PRINT(", cksum 0x%04x ", GET_BE_U_2(pim->pim_cksum));
719 if (GET_BE_U_2(pim->pim_cksum) == 0) {
720 ND_PRINT("(unverified)");
721 } else {
722 if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) {
723 /*
724 * The checksum only covers the packet header,
725 * not the encapsulated packet.
726 */
727 cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
728 if (cksum_status == INCORRECT) {
729 /*
730 * To quote RFC 4601, "For interoperability
731 * reasons, a message carrying a checksum
732 * calculated over the entire PIM Register
733 * message should also be accepted."
734 */
735 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
736 }
737 } else {
738 /*
739 * The checksum covers the entire packet.
740 */
741 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
742 }
743 switch (cksum_status) {
744
745 case CORRECT:
746 ND_PRINT("(correct)");
747 break;
748
749 case INCORRECT:
750 ND_PRINT("(incorrect)");
751 break;
752
753 case UNVERIFIED:
754 ND_PRINT("(unverified)");
755 break;
756 }
757 }
758 bp += 4;
759 len -= 4;
760
761 switch (PIM_TYPE(pim_typever)) {
762 case PIMV2_TYPE_HELLO:
763 {
764 uint16_t otype, olen;
765 while (len > 0) {
766 if (len < 4)
767 goto trunc;
768 otype = GET_BE_U_2(bp);
769 olen = GET_BE_U_2(bp + 2);
770 ND_PRINT("\n\t %s Option (%u), length %u, Value: ",
771 tok2str(pimv2_hello_option_values, "Unknown", otype),
772 otype,
773 olen);
774 bp += 4;
775 len -= 4;
776
777 if (len < olen)
778 goto trunc;
779 ND_TCHECK_LEN(bp, olen);
780 switch (otype) {
781 case PIMV2_HELLO_OPTION_HOLDTIME:
782 if (olen != 2) {
783 ND_PRINT("[option length %u != 2]", olen);
784 nd_print_invalid(ndo);
785 return;
786 } else {
787 unsigned_relts_print(ndo,
788 GET_BE_U_2(bp));
789 }
790 break;
791
792 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
793 if (olen != 4) {
794 ND_PRINT("[option length %u != 4]", olen);
795 nd_print_invalid(ndo);
796 return;
797 } else {
798 char t_bit;
799 uint16_t lan_delay, override_interval;
800 lan_delay = GET_BE_U_2(bp);
801 override_interval = GET_BE_U_2(bp + 2);
802 t_bit = (lan_delay & 0x8000)? 1 : 0;
803 lan_delay &= ~0x8000;
804 ND_PRINT("\n\t T-bit=%u, LAN delay %ums, Override interval %ums",
805 t_bit, lan_delay, override_interval);
806 }
807 break;
808
809 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
810 case PIMV2_HELLO_OPTION_DR_PRIORITY:
811 switch (olen) {
812 case 0:
813 ND_PRINT("Bi-Directional Capability (Old)");
814 break;
815 case 4:
816 ND_PRINT("%u", GET_BE_U_4(bp));
817 break;
818 default:
819 ND_PRINT("[option length %u != 4]", olen);
820 nd_print_invalid(ndo);
821 return;
822 break;
823 }
824 break;
825
826 case PIMV2_HELLO_OPTION_GENID:
827 if (olen != 4) {
828 ND_PRINT("[option length %u != 4]", olen);
829 nd_print_invalid(ndo);
830 return;
831 } else {
832 ND_PRINT("0x%08x", GET_BE_U_4(bp));
833 }
834 break;
835
836 case PIMV2_HELLO_OPTION_REFRESH_CAP:
837 if (olen != 4) {
838 ND_PRINT("[option length %u != 4]", olen);
839 nd_print_invalid(ndo);
840 return;
841 } else {
842 ND_PRINT("v%u", GET_U_1(bp));
843 if (GET_U_1(bp + 1) != 0) {
844 ND_PRINT(", interval ");
845 unsigned_relts_print(ndo,
846 GET_U_1(bp + 1));
847 }
848 if (GET_BE_U_2(bp + 2) != 0) {
849 ND_PRINT(" ?0x%04x?",
850 GET_BE_U_2(bp + 2));
851 }
852 }
853 break;
854
855 case PIMV2_HELLO_OPTION_BIDIR_CAP:
856 break;
857
858 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
859 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
860 if (ndo->ndo_vflag > 1) {
861 const u_char *ptr = bp;
862 u_int plen = len;
863 while (ptr < (bp+olen)) {
864 ND_PRINT("\n\t ");
865 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
866 if (advance < 0)
867 goto trunc;
868 ptr += advance;
869 plen -= advance;
870 }
871 }
872 break;
873 default:
874 if (ndo->ndo_vflag <= 1)
875 print_unknown_data(ndo, bp, "\n\t ", olen);
876 break;
877 }
878 /* do we want to see an additionally hexdump ? */
879 if (ndo->ndo_vflag> 1)
880 print_unknown_data(ndo, bp, "\n\t ", olen);
881 bp += olen;
882 len -= olen;
883 }
884 break;
885 }
886
887 case PIMV2_TYPE_REGISTER:
888 {
889 const struct ip *ip;
890
891 if (len < 4)
892 goto trunc;
893 ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN);
894
895 ND_PRINT(", Flags [ %s ]\n\t",
896 tok2str(pimv2_register_flag_values,
897 "none",
898 GET_BE_U_4(bp)));
899
900 bp += 4; len -= 4;
901 /* encapsulated multicast packet */
902 if (len == 0)
903 goto trunc;
904 ip = (const struct ip *)bp;
905 switch (IP_V(ip)) {
906 case 0: /* Null header */
907 ND_PRINT("IP-Null-header %s > %s",
908 GET_IPADDR_STRING(ip->ip_src),
909 GET_IPADDR_STRING(ip->ip_dst));
910 break;
911
912 case 4: /* IPv4 */
913 ip_print(ndo, bp, len);
914 break;
915
916 case 6: /* IPv6 */
917 ip6_print(ndo, bp, len);
918 break;
919
920 default:
921 ND_PRINT("IP ver %u", IP_V(ip));
922 break;
923 }
924 break;
925 }
926
927 case PIMV2_TYPE_REGISTER_STOP:
928 ND_PRINT(" group=");
929 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
930 goto trunc;
931 bp += advance; len -= advance;
932 ND_PRINT(" source=");
933 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
934 goto trunc;
935 bp += advance; len -= advance;
936 break;
937
938 case PIMV2_TYPE_JOIN_PRUNE:
939 case PIMV2_TYPE_GRAFT:
940 case PIMV2_TYPE_GRAFT_ACK:
941
942
943 /*
944 * 0 1 2 3
945 * 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
946 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
947 * |PIM Ver| Type | Addr length | Checksum |
948 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
949 * | Unicast-Upstream Neighbor Address |
950 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
951 * | Reserved | Num groups | Holdtime |
952 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
953 * | Encoded-Multicast Group Address-1 |
954 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
955 * | Number of Joined Sources | Number of Pruned Sources |
956 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
957 * | Encoded-Joined Source Address-1 |
958 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
959 * | . |
960 * | . |
961 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
962 * | Encoded-Joined Source Address-n |
963 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
964 * | Encoded-Pruned Source Address-1 |
965 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
966 * | . |
967 * | . |
968 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
969 * | Encoded-Pruned Source Address-n |
970 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
971 * | . |
972 * | . |
973 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
974 * | Encoded-Multicast Group Address-n |
975 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
976 */
977
978 {
979 uint8_t ngroup;
980 uint16_t holdtime;
981 uint16_t njoin;
982 uint16_t nprune;
983 u_int i, j;
984
985 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
986 ND_PRINT(", upstream-neighbor: ");
987 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
988 goto trunc;
989 bp += advance; len -= advance;
990 }
991 if (len < 4)
992 goto trunc;
993 ND_TCHECK_4(bp);
994 ngroup = GET_U_1(bp + 1);
995 holdtime = GET_BE_U_2(bp + 2);
996 ND_PRINT("\n\t %u group(s)", ngroup);
997 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
998 ND_PRINT(", holdtime: ");
999 if (holdtime == 0xffff)
1000 ND_PRINT("infinite");
1001 else
1002 unsigned_relts_print(ndo, holdtime);
1003 }
1004 bp += 4; len -= 4;
1005 for (i = 0; i < ngroup; i++) {
1006 ND_PRINT("\n\t group #%u: ", i+1);
1007 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1008 goto trunc;
1009 bp += advance; len -= advance;
1010 if (len < 4)
1011 goto trunc;
1012 ND_TCHECK_4(bp);
1013 njoin = GET_BE_U_2(bp);
1014 nprune = GET_BE_U_2(bp + 2);
1015 ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune);
1016 bp += 4; len -= 4;
1017 for (j = 0; j < njoin; j++) {
1018 ND_PRINT("\n\t joined 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 for (j = 0; j < nprune; j++) {
1024 ND_PRINT("\n\t pruned source #%u: ", j+1);
1025 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1026 goto trunc;
1027 bp += advance; len -= advance;
1028 }
1029 }
1030 break;
1031 }
1032
1033 case PIMV2_TYPE_BOOTSTRAP:
1034 {
1035 u_int i, j, frpcnt;
1036
1037 /* Fragment Tag, Hash Mask len, and BSR-priority */
1038 if (len < 2)
1039 goto trunc;
1040 ND_PRINT(" tag=%x", GET_BE_U_2(bp));
1041 bp += 2;
1042 len -= 2;
1043 if (len < 1)
1044 goto trunc;
1045 ND_PRINT(" hashmlen=%u", GET_U_1(bp));
1046 if (len < 2)
1047 goto trunc;
1048 ND_TCHECK_1(bp + 2);
1049 ND_PRINT(" BSRprio=%u", GET_U_1(bp + 1));
1050 bp += 2;
1051 len -= 2;
1052
1053 /* Encoded-Unicast-BSR-Address */
1054 ND_PRINT(" BSR=");
1055 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1056 goto trunc;
1057 bp += advance;
1058 len -= advance;
1059
1060 for (i = 0; len > 0; i++) {
1061 /* Encoded-Group Address */
1062 ND_PRINT(" (group%u: ", i);
1063 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1064 goto trunc;
1065 bp += advance;
1066 len -= advance;
1067
1068 /* RP-Count, Frag RP-Cnt, and rsvd */
1069 if (len < 1)
1070 goto trunc;
1071 ND_PRINT(" RPcnt=%u", GET_U_1(bp));
1072 if (len < 2)
1073 goto trunc;
1074 frpcnt = GET_U_1(bp + 1);
1075 ND_PRINT(" FRPcnt=%u", frpcnt);
1076 if (len < 4)
1077 goto trunc;
1078 bp += 4;
1079 len -= 4;
1080
1081 for (j = 0; j < frpcnt && len > 0; j++) {
1082 /* each RP info */
1083 ND_PRINT(" RP%u=", j);
1084 if ((advance = pimv2_addr_print(ndo, bp, len,
1085 pimv2_unicast,
1086 pimv2_addr_len,
1087 0)) < 0)
1088 goto trunc;
1089 bp += advance;
1090 len -= advance;
1091
1092 if (len < 2)
1093 goto trunc;
1094 ND_TCHECK_2(bp);
1095 ND_PRINT(",holdtime=");
1096 unsigned_relts_print(ndo,
1097 GET_BE_U_2(bp));
1098 if (len < 3)
1099 goto trunc;
1100 ND_PRINT(",prio=%u", GET_U_1(bp + 2));
1101 if (len < 4)
1102 goto trunc;
1103 bp += 4;
1104 len -= 4;
1105 }
1106 ND_PRINT(")");
1107 }
1108 break;
1109 }
1110 case PIMV2_TYPE_ASSERT:
1111 ND_PRINT(" group=");
1112 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1113 goto trunc;
1114 bp += advance; len -= advance;
1115 ND_PRINT(" src=");
1116 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1117 goto trunc;
1118 bp += advance; len -= advance;
1119 if (len < 8)
1120 goto trunc;
1121 ND_TCHECK_8(bp);
1122 if (GET_U_1(bp) & 0x80)
1123 ND_PRINT(" RPT");
1124 ND_PRINT(" pref=%u", GET_BE_U_4(bp) & 0x7fffffff);
1125 ND_PRINT(" metric=%u", GET_BE_U_4(bp + 4));
1126 break;
1127
1128 case PIMV2_TYPE_CANDIDATE_RP:
1129 {
1130 u_int i, pfxcnt;
1131
1132 /* Prefix-Cnt, Priority, and Holdtime */
1133 if (len < 1)
1134 goto trunc;
1135 ND_PRINT(" prefix-cnt=%u", GET_U_1(bp));
1136 pfxcnt = GET_U_1(bp);
1137 if (len < 2)
1138 goto trunc;
1139 ND_PRINT(" prio=%u", GET_U_1(bp + 1));
1140 if (len < 4)
1141 goto trunc;
1142 ND_PRINT(" holdtime=");
1143 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
1144 bp += 4;
1145 len -= 4;
1146
1147 /* Encoded-Unicast-RP-Address */
1148 ND_PRINT(" RP=");
1149 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1150 goto trunc;
1151 bp += advance;
1152 len -= advance;
1153
1154 /* Encoded-Group Addresses */
1155 for (i = 0; i < pfxcnt && len > 0; i++) {
1156 ND_PRINT(" Group%u=", i);
1157 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1158 goto trunc;
1159 bp += advance;
1160 len -= advance;
1161 }
1162 break;
1163 }
1164
1165 case PIMV2_TYPE_PRUNE_REFRESH:
1166 ND_PRINT(" src=");
1167 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1168 goto trunc;
1169 bp += advance;
1170 len -= advance;
1171 ND_PRINT(" grp=");
1172 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1173 goto trunc;
1174 bp += advance;
1175 len -= advance;
1176 ND_PRINT(" forwarder=");
1177 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1178 goto trunc;
1179 bp += advance;
1180 len -= advance;
1181 if (len < 2)
1182 goto trunc;
1183 ND_PRINT(" TUNR ");
1184 unsigned_relts_print(ndo, GET_BE_U_2(bp));
1185 break;
1186
1187 case PIMV2_TYPE_DF_ELECTION:
1188 subtype = PIM_SUBTYPE(GET_U_1(pim->pim_rsv));
1189 ND_PRINT("\n\t %s,", tok2str( pimv2_df_election_flag_values,
1190 "Unknown", subtype) );
1191
1192 ND_PRINT(" rpa=");
1193 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1194 goto trunc;
1195 }
1196 bp += advance;
1197 len -= advance;
1198 ND_PRINT(" sender pref=%u", GET_BE_U_4(bp) );
1199 ND_PRINT(" sender metric=%u", GET_BE_U_4(bp + 4));
1200
1201 bp += 8;
1202 len -= 8;
1203
1204 switch (subtype) {
1205 case PIMV2_DF_ELECTION_BACKOFF:
1206 case PIMV2_DF_ELECTION_PASS:
1207 ND_PRINT("\n\t %s addr=", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype));
1208 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1209 goto trunc;
1210 }
1211 bp += advance;
1212 len -= advance;
1213
1214 ND_PRINT(" %s pref=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp) );
1215 ND_PRINT(" %s metric=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp + 4));
1216
1217 bp += 8;
1218 len -= 8;
1219
1220 if (subtype == PIMV2_DF_ELECTION_BACKOFF) {
1221 ND_PRINT(" interval %dms", GET_BE_U_2(bp));
1222 }
1223
1224 break;
1225 default:
1226 break;
1227 }
1228 break;
1229
1230 default:
1231 ND_PRINT(" [type %u]", PIM_TYPE(pim_typever));
1232 break;
1233 }
1234
1235 return;
1236
1237 trunc:
1238 nd_print_trunc(ndo);
1239 }
[mirror] the TCPdump network dissector