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remove redundant ND_TCHECK, let GET_ routines handle checks
[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_PRINT(" group %s", GET_IPADDR_STRING(bp + 8));
309 if (GET_BE_U_4(bp + 12) != 0xffffffff)
310 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
311 ND_PRINT(" RP %s hold ", GET_IPADDR_STRING(bp + 16));
312 unsigned_relts_print(ndo, GET_BE_U_2(bp + 22));
313 }
314 break;
315 case PIMV1_TYPE_ASSERT:
316 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 16),
317 GET_IPADDR_STRING(bp + 8));
318 if (GET_BE_U_4(bp + 12) != 0xffffffff)
319 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
320 ND_PRINT(" %s pref %u metric %u",
321 (GET_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT",
322 GET_BE_U_4(bp + 20) & 0x7fffffff,
323 GET_BE_U_4(bp + 24));
324 break;
325 case PIMV1_TYPE_JOIN_PRUNE:
326 case PIMV1_TYPE_GRAFT:
327 case PIMV1_TYPE_GRAFT_ACK:
328 if (ndo->ndo_vflag) {
329 if (len < 8)
330 goto trunc;
331 pimv1_join_prune_print(ndo, bp + 8, len - 8);
332 }
333 break;
334 }
335 if ((GET_U_1(bp + 4) >> 4) != 1)
336 ND_PRINT(" [v%u]", GET_U_1(bp + 4) >> 4);
337 return;
338
339 trunc:
340 nd_print_trunc(ndo);
341 return;
342 }
343
344 /*
345 * auto-RP is a cisco protocol, documented at
346 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
347 *
348 * This implements version 1+, dated Sept 9, 1998.
349 */
350 void
351 cisco_autorp_print(netdissect_options *ndo,
352 const u_char *bp, u_int len)
353 {
354 u_int type;
355 u_int numrps;
356 u_int hold;
357
358 ndo->ndo_protocol = "cisco_autorp";
359 if (len < 8)
360 goto trunc;
361 ND_PRINT(" auto-rp ");
362 type = GET_U_1(bp);
363 switch (type) {
364 case 0x11:
365 ND_PRINT("candidate-advert");
366 break;
367 case 0x12:
368 ND_PRINT("mapping");
369 break;
370 default:
371 ND_PRINT("type-0x%02x", type);
372 break;
373 }
374
375 numrps = GET_U_1(bp + 1);
376
377 ND_PRINT(" Hold ");
378 hold = GET_BE_U_2(bp + 2);
379 if (hold)
380 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
381 else
382 ND_PRINT("FOREVER");
383
384 /* Next 4 bytes are reserved. */
385
386 bp += 8; len -= 8;
387
388 /*XXX skip unless -v? */
389
390 /*
391 * Rest of packet:
392 * numrps entries of the form:
393 * 32 bits: RP
394 * 6 bits: reserved
395 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
396 * 8 bits: # of entries for this RP
397 * each entry: 7 bits: reserved, 1 bit: negative,
398 * 8 bits: mask 32 bits: source
399 * lather, rinse, repeat.
400 */
401 while (numrps != 0) {
402 u_int nentries;
403 char s;
404
405 if (len < 4)
406 goto trunc;
407 ND_PRINT(" RP %s", GET_IPADDR_STRING(bp));
408 bp += 4;
409 len -= 4;
410 if (len < 1)
411 goto trunc;
412 switch (GET_U_1(bp) & 0x3) {
413 case 0: ND_PRINT(" PIMv?");
414 break;
415 case 1: ND_PRINT(" PIMv1");
416 break;
417 case 2: ND_PRINT(" PIMv2");
418 break;
419 case 3: ND_PRINT(" PIMv1+2");
420 break;
421 }
422 if (GET_U_1(bp) & 0xfc)
423 ND_PRINT(" [rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
424 bp += 1;
425 len -= 1;
426 if (len < 1)
427 goto trunc;
428 nentries = GET_U_1(bp);
429 bp += 1;
430 len -= 1;
431 s = ' ';
432 while (nentries != 0) {
433 if (len < 6)
434 goto trunc;
435 ND_PRINT("%c%s%s/%u", s, GET_U_1(bp) & 1 ? "!" : "",
436 GET_IPADDR_STRING(bp + 2), GET_U_1(bp + 1));
437 if (GET_U_1(bp) & 0x02) {
438 ND_PRINT(" bidir");
439 }
440 if (GET_U_1(bp) & 0xfc) {
441 ND_PRINT("[rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
442 }
443 s = ',';
444 bp += 6; len -= 6;
445 nentries--;
446 }
447 numrps--;
448 }
449 return;
450
451 trunc:
452 nd_print_trunc(ndo);
453 return;
454 }
455
456 void
457 pim_print(netdissect_options *ndo,
458 const u_char *bp, u_int len, const u_char *bp2)
459 {
460 const struct pim *pim = (const struct pim *)bp;
461 uint8_t pim_typever;
462
463 ndo->ndo_protocol = "pim";
464
465 pim_typever = GET_U_1(pim->pim_typever);
466 switch (PIM_VER(pim_typever)) {
467 case 2:
468 if (!ndo->ndo_vflag) {
469 ND_PRINT("PIMv%u, %s, length %u",
470 PIM_VER(pim_typever),
471 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)),
472 len);
473 return;
474 } else {
475 ND_PRINT("PIMv%u, length %u\n\t%s",
476 PIM_VER(pim_typever),
477 len,
478 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)));
479 pimv2_print(ndo, bp, len, bp2);
480 }
481 break;
482 default:
483 ND_PRINT("PIMv%u, length %u",
484 PIM_VER(pim_typever),
485 len);
486 break;
487 }
488 }
489
490 /*
491 * PIMv2 uses encoded address representations.
492 *
493 * The last PIM-SM I-D before RFC2117 was published specified the
494 * following representation for unicast addresses. However, RFC2117
495 * specified no encoding for unicast addresses with the unicast
496 * address length specified in the header. Therefore, we have to
497 * guess which encoding is being used (Cisco's PIMv2 implementation
498 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
499 * field into a 'unicast-address-length-in-bytes' field. We guess
500 * that it's the draft encoding if this reserved field is zero.
501 *
502 * RFC2362 goes back to the encoded format, and calls the addr length
503 * field "reserved" again.
504 *
505 * The first byte is the address family, from:
506 *
507 * 0 Reserved
508 * 1 IP (IP version 4)
509 * 2 IP6 (IP version 6)
510 * 3 NSAP
511 * 4 HDLC (8-bit multidrop)
512 * 5 BBN 1822
513 * 6 802 (includes all 802 media plus Ethernet "canonical format")
514 * 7 E.163
515 * 8 E.164 (SMDS, Frame Relay, ATM)
516 * 9 F.69 (Telex)
517 * 10 X.121 (X.25, Frame Relay)
518 * 11 IPX
519 * 12 Appletalk
520 * 13 Decnet IV
521 * 14 Banyan Vines
522 * 15 E.164 with NSAP format subaddress
523 *
524 * In addition, the second byte is an "Encoding". 0 is the default
525 * encoding for the address family, and no other encodings are currently
526 * specified.
527 *
528 */
529
530 enum pimv2_addrtype {
531 pimv2_unicast, pimv2_group, pimv2_source
532 };
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 | Unicast Address |
538 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
539 * 0 1 2 3
540 * 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
541 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
542 * | Addr Family | Encoding Type | Reserved | Mask Len |
543 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
544 * | Group multicast Address |
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
546 * 0 1 2 3
547 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
548 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
549 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
550 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
551 * | Source Address |
552 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
553 */
554 static int
555 pimv2_addr_print(netdissect_options *ndo,
556 const u_char *bp, u_int len, enum pimv2_addrtype at,
557 u_int addr_len, int silent)
558 {
559 u_int af;
560 int hdrlen;
561
562 if (addr_len == 0) {
563 if (len < 2)
564 goto trunc;
565 switch (GET_U_1(bp)) {
566 case 1:
567 af = AF_INET;
568 addr_len = (u_int)sizeof(nd_ipv4);
569 break;
570 case 2:
571 af = AF_INET6;
572 addr_len = (u_int)sizeof(nd_ipv6);
573 break;
574 default:
575 return -1;
576 }
577 if (GET_U_1(bp + 1) != 0)
578 return -1;
579 hdrlen = 2;
580 } else {
581 switch (addr_len) {
582 case sizeof(nd_ipv4):
583 af = AF_INET;
584 break;
585 case sizeof(nd_ipv6):
586 af = AF_INET6;
587 break;
588 default:
589 return -1;
590 break;
591 }
592 hdrlen = 0;
593 }
594
595 bp += hdrlen;
596 len -= hdrlen;
597 switch (at) {
598 case pimv2_unicast:
599 if (len < addr_len)
600 goto trunc;
601 ND_TCHECK_LEN(bp, addr_len);
602 if (af == AF_INET) {
603 if (!silent)
604 ND_PRINT("%s", GET_IPADDR_STRING(bp));
605 }
606 else if (af == AF_INET6) {
607 if (!silent)
608 ND_PRINT("%s", GET_IP6ADDR_STRING(bp));
609 }
610 return hdrlen + addr_len;
611 case pimv2_group:
612 case pimv2_source:
613 if (len < addr_len + 2)
614 goto trunc;
615 ND_TCHECK_LEN(bp, addr_len + 2);
616 if (af == AF_INET) {
617 if (!silent) {
618 ND_PRINT("%s", GET_IPADDR_STRING(bp + 2));
619 if (GET_U_1(bp + 1) != 32)
620 ND_PRINT("/%u", GET_U_1(bp + 1));
621 }
622 }
623 else if (af == AF_INET6) {
624 if (!silent) {
625 ND_PRINT("%s", GET_IP6ADDR_STRING(bp + 2));
626 if (GET_U_1(bp + 1) != 128)
627 ND_PRINT("/%u", GET_U_1(bp + 1));
628 }
629 }
630 if (GET_U_1(bp) && !silent) {
631 if (at == pimv2_group) {
632 ND_PRINT("(0x%02x)", GET_U_1(bp));
633 } else {
634 ND_PRINT("(%s%s%s",
635 GET_U_1(bp) & 0x04 ? "S" : "",
636 GET_U_1(bp) & 0x02 ? "W" : "",
637 GET_U_1(bp) & 0x01 ? "R" : "");
638 if (GET_U_1(bp) & 0xf8) {
639 ND_PRINT("+0x%02x",
640 GET_U_1(bp) & 0xf8);
641 }
642 ND_PRINT(")");
643 }
644 }
645 return hdrlen + 2 + addr_len;
646 default:
647 return -1;
648 }
649 trunc:
650 return -1;
651 }
652
653 enum checksum_status {
654 CORRECT,
655 INCORRECT,
656 UNVERIFIED
657 };
658
659 static enum checksum_status
660 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
661 const u_char *bp2, u_int len)
662 {
663 const struct ip *ip;
664 u_int cksum;
665
666 if (!ND_TTEST_LEN(bp, len)) {
667 /* We don't have all the data. */
668 return (UNVERIFIED);
669 }
670 ip = (const struct ip *)bp2;
671 if (IP_V(ip) == 4) {
672 struct cksum_vec vec[1];
673
674 vec[0].ptr = bp;
675 vec[0].len = len;
676 cksum = in_cksum(vec, 1);
677 return (cksum ? INCORRECT : CORRECT);
678 } else if (IP_V(ip) == 6) {
679 const struct ip6_hdr *ip6;
680
681 ip6 = (const struct ip6_hdr *)bp2;
682 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
683 return (cksum ? INCORRECT : CORRECT);
684 } else {
685 return (UNVERIFIED);
686 }
687 }
688
689 static void
690 pimv2_print(netdissect_options *ndo,
691 const u_char *bp, u_int len, const u_char *bp2)
692 {
693 const struct pim *pim = (const struct pim *)bp;
694 int advance;
695 int subtype;
696 enum checksum_status cksum_status;
697 u_int pim_typever;
698 u_int pimv2_addr_len;
699
700 ndo->ndo_protocol = "pimv2";
701 if (len < 2) {
702 ND_PRINT("[length %u < 2]", len);
703 nd_print_invalid(ndo);
704 return;
705 }
706 pim_typever = GET_U_1(pim->pim_typever);
707 /* RFC5015 allocates the high 4 bits of pim_rsv for "subtype". */
708 pimv2_addr_len = GET_U_1(pim->pim_rsv) & 0x0f;
709 if (pimv2_addr_len != 0)
710 ND_PRINT(", RFC2117-encoding");
711
712 if (len < 4) {
713 ND_PRINT("[length %u < 4]", len);
714 nd_print_invalid(ndo);
715 return;
716 }
717 ND_PRINT(", cksum 0x%04x ", GET_BE_U_2(pim->pim_cksum));
718 if (GET_BE_U_2(pim->pim_cksum) == 0) {
719 ND_PRINT("(unverified)");
720 } else {
721 if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) {
722 /*
723 * The checksum only covers the packet header,
724 * not the encapsulated packet.
725 */
726 cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
727 if (cksum_status == INCORRECT) {
728 /*
729 * To quote RFC 4601, "For interoperability
730 * reasons, a message carrying a checksum
731 * calculated over the entire PIM Register
732 * message should also be accepted."
733 */
734 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
735 }
736 } else {
737 /*
738 * The checksum covers the entire packet.
739 */
740 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
741 }
742 switch (cksum_status) {
743
744 case CORRECT:
745 ND_PRINT("(correct)");
746 break;
747
748 case INCORRECT:
749 ND_PRINT("(incorrect)");
750 break;
751
752 case UNVERIFIED:
753 ND_PRINT("(unverified)");
754 break;
755 }
756 }
757 bp += 4;
758 len -= 4;
759
760 switch (PIM_TYPE(pim_typever)) {
761 case PIMV2_TYPE_HELLO:
762 {
763 uint16_t otype, olen;
764 while (len > 0) {
765 if (len < 4)
766 goto trunc;
767 otype = GET_BE_U_2(bp);
768 olen = GET_BE_U_2(bp + 2);
769 ND_PRINT("\n\t %s Option (%u), length %u, Value: ",
770 tok2str(pimv2_hello_option_values, "Unknown", otype),
771 otype,
772 olen);
773 bp += 4;
774 len -= 4;
775
776 if (len < olen)
777 goto trunc;
778 ND_TCHECK_LEN(bp, olen);
779 switch (otype) {
780 case PIMV2_HELLO_OPTION_HOLDTIME:
781 if (olen != 2) {
782 ND_PRINT("[option length %u != 2]", olen);
783 nd_print_invalid(ndo);
784 return;
785 } else {
786 unsigned_relts_print(ndo,
787 GET_BE_U_2(bp));
788 }
789 break;
790
791 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
792 if (olen != 4) {
793 ND_PRINT("[option length %u != 4]", olen);
794 nd_print_invalid(ndo);
795 return;
796 } else {
797 char t_bit;
798 uint16_t lan_delay, override_interval;
799 lan_delay = GET_BE_U_2(bp);
800 override_interval = GET_BE_U_2(bp + 2);
801 t_bit = (lan_delay & 0x8000)? 1 : 0;
802 lan_delay &= ~0x8000;
803 ND_PRINT("\n\t T-bit=%u, LAN delay %ums, Override interval %ums",
804 t_bit, lan_delay, override_interval);
805 }
806 break;
807
808 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
809 case PIMV2_HELLO_OPTION_DR_PRIORITY:
810 switch (olen) {
811 case 0:
812 ND_PRINT("Bi-Directional Capability (Old)");
813 break;
814 case 4:
815 ND_PRINT("%u", GET_BE_U_4(bp));
816 break;
817 default:
818 ND_PRINT("[option length %u != 4]", olen);
819 nd_print_invalid(ndo);
820 return;
821 break;
822 }
823 break;
824
825 case PIMV2_HELLO_OPTION_GENID:
826 if (olen != 4) {
827 ND_PRINT("[option length %u != 4]", olen);
828 nd_print_invalid(ndo);
829 return;
830 } else {
831 ND_PRINT("0x%08x", GET_BE_U_4(bp));
832 }
833 break;
834
835 case PIMV2_HELLO_OPTION_REFRESH_CAP:
836 if (olen != 4) {
837 ND_PRINT("[option length %u != 4]", olen);
838 nd_print_invalid(ndo);
839 return;
840 } else {
841 ND_PRINT("v%u", GET_U_1(bp));
842 if (GET_U_1(bp + 1) != 0) {
843 ND_PRINT(", interval ");
844 unsigned_relts_print(ndo,
845 GET_U_1(bp + 1));
846 }
847 if (GET_BE_U_2(bp + 2) != 0) {
848 ND_PRINT(" ?0x%04x?",
849 GET_BE_U_2(bp + 2));
850 }
851 }
852 break;
853
854 case PIMV2_HELLO_OPTION_BIDIR_CAP:
855 break;
856
857 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
858 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
859 if (ndo->ndo_vflag > 1) {
860 const u_char *ptr = bp;
861 u_int plen = len;
862 while (ptr < (bp+olen)) {
863 ND_PRINT("\n\t ");
864 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
865 if (advance < 0)
866 goto trunc;
867 ptr += advance;
868 plen -= advance;
869 }
870 }
871 break;
872 default:
873 if (ndo->ndo_vflag <= 1)
874 print_unknown_data(ndo, bp, "\n\t ", olen);
875 break;
876 }
877 /* do we want to see an additionally hexdump ? */
878 if (ndo->ndo_vflag> 1)
879 print_unknown_data(ndo, bp, "\n\t ", olen);
880 bp += olen;
881 len -= olen;
882 }
883 break;
884 }
885
886 case PIMV2_TYPE_REGISTER:
887 {
888 const struct ip *ip;
889
890 if (len < 4)
891 goto trunc;
892 ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN);
893
894 ND_PRINT(", Flags [ %s ]\n\t",
895 tok2str(pimv2_register_flag_values,
896 "none",
897 GET_BE_U_4(bp)));
898
899 bp += 4; len -= 4;
900 /* encapsulated multicast packet */
901 if (len == 0)
902 goto trunc;
903 ip = (const struct ip *)bp;
904 switch (IP_V(ip)) {
905 case 0: /* Null header */
906 ND_PRINT("IP-Null-header %s > %s",
907 GET_IPADDR_STRING(ip->ip_src),
908 GET_IPADDR_STRING(ip->ip_dst));
909 break;
910
911 case 4: /* IPv4 */
912 ip_print(ndo, bp, len);
913 break;
914
915 case 6: /* IPv6 */
916 ip6_print(ndo, bp, len);
917 break;
918
919 default:
920 ND_PRINT("IP ver %u", IP_V(ip));
921 break;
922 }
923 break;
924 }
925
926 case PIMV2_TYPE_REGISTER_STOP:
927 ND_PRINT(" group=");
928 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
929 goto trunc;
930 bp += advance; len -= advance;
931 ND_PRINT(" source=");
932 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
933 goto trunc;
934 bp += advance; len -= advance;
935 break;
936
937 case PIMV2_TYPE_JOIN_PRUNE:
938 case PIMV2_TYPE_GRAFT:
939 case PIMV2_TYPE_GRAFT_ACK:
940
941
942 /*
943 * 0 1 2 3
944 * 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
945 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
946 * |PIM Ver| Type | Addr length | Checksum |
947 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
948 * | Unicast-Upstream Neighbor Address |
949 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
950 * | Reserved | Num groups | Holdtime |
951 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
952 * | Encoded-Multicast Group Address-1 |
953 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
954 * | Number of Joined Sources | Number of Pruned Sources |
955 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
956 * | Encoded-Joined Source Address-1 |
957 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
958 * | . |
959 * | . |
960 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
961 * | Encoded-Joined Source Address-n |
962 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
963 * | Encoded-Pruned Source Address-1 |
964 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
965 * | . |
966 * | . |
967 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
968 * | Encoded-Pruned Source Address-n |
969 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
970 * | . |
971 * | . |
972 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
973 * | Encoded-Multicast Group Address-n |
974 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
975 */
976
977 {
978 uint8_t ngroup;
979 uint16_t holdtime;
980 uint16_t njoin;
981 uint16_t nprune;
982 u_int i, j;
983
984 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
985 ND_PRINT(", upstream-neighbor: ");
986 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
987 goto trunc;
988 bp += advance; len -= advance;
989 }
990 if (len < 4)
991 goto trunc;
992 ND_TCHECK_4(bp);
993 ngroup = GET_U_1(bp + 1);
994 holdtime = GET_BE_U_2(bp + 2);
995 ND_PRINT("\n\t %u group(s)", ngroup);
996 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
997 ND_PRINT(", holdtime: ");
998 if (holdtime == 0xffff)
999 ND_PRINT("infinite");
1000 else
1001 unsigned_relts_print(ndo, holdtime);
1002 }
1003 bp += 4; len -= 4;
1004 for (i = 0; i < ngroup; i++) {
1005 ND_PRINT("\n\t group #%u: ", i+1);
1006 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1007 goto trunc;
1008 bp += advance; len -= advance;
1009 if (len < 4)
1010 goto trunc;
1011 ND_TCHECK_4(bp);
1012 njoin = GET_BE_U_2(bp);
1013 nprune = GET_BE_U_2(bp + 2);
1014 ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune);
1015 bp += 4; len -= 4;
1016 for (j = 0; j < njoin; j++) {
1017 ND_PRINT("\n\t joined source #%u: ", j+1);
1018 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1019 goto trunc;
1020 bp += advance; len -= advance;
1021 }
1022 for (j = 0; j < nprune; j++) {
1023 ND_PRINT("\n\t pruned source #%u: ", j+1);
1024 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1025 goto trunc;
1026 bp += advance; len -= advance;
1027 }
1028 }
1029 break;
1030 }
1031
1032 case PIMV2_TYPE_BOOTSTRAP:
1033 {
1034 u_int i, j, frpcnt;
1035
1036 /* Fragment Tag, Hash Mask len, and BSR-priority */
1037 if (len < 2)
1038 goto trunc;
1039 ND_PRINT(" tag=%x", GET_BE_U_2(bp));
1040 bp += 2;
1041 len -= 2;
1042 if (len < 1)
1043 goto trunc;
1044 ND_PRINT(" hashmlen=%u", GET_U_1(bp));
1045 if (len < 2)
1046 goto trunc;
1047 ND_TCHECK_1(bp + 2);
1048 ND_PRINT(" BSRprio=%u", GET_U_1(bp + 1));
1049 bp += 2;
1050 len -= 2;
1051
1052 /* Encoded-Unicast-BSR-Address */
1053 ND_PRINT(" BSR=");
1054 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1055 goto trunc;
1056 bp += advance;
1057 len -= advance;
1058
1059 for (i = 0; len > 0; i++) {
1060 /* Encoded-Group Address */
1061 ND_PRINT(" (group%u: ", i);
1062 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1063 goto trunc;
1064 bp += advance;
1065 len -= advance;
1066
1067 /* RP-Count, Frag RP-Cnt, and rsvd */
1068 if (len < 1)
1069 goto trunc;
1070 ND_PRINT(" RPcnt=%u", GET_U_1(bp));
1071 if (len < 2)
1072 goto trunc;
1073 frpcnt = GET_U_1(bp + 1);
1074 ND_PRINT(" FRPcnt=%u", frpcnt);
1075 if (len < 4)
1076 goto trunc;
1077 bp += 4;
1078 len -= 4;
1079
1080 for (j = 0; j < frpcnt && len > 0; j++) {
1081 /* each RP info */
1082 ND_PRINT(" RP%u=", j);
1083 if ((advance = pimv2_addr_print(ndo, bp, len,
1084 pimv2_unicast,
1085 pimv2_addr_len,
1086 0)) < 0)
1087 goto trunc;
1088 bp += advance;
1089 len -= advance;
1090
1091 if (len < 2)
1092 goto trunc;
1093 ND_PRINT(",holdtime=");
1094 unsigned_relts_print(ndo,
1095 GET_BE_U_2(bp));
1096 if (len < 3)
1097 goto trunc;
1098 ND_PRINT(",prio=%u", GET_U_1(bp + 2));
1099 if (len < 4)
1100 goto trunc;
1101 bp += 4;
1102 len -= 4;
1103 }
1104 ND_PRINT(")");
1105 }
1106 break;
1107 }
1108 case PIMV2_TYPE_ASSERT:
1109 ND_PRINT(" group=");
1110 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1111 goto trunc;
1112 bp += advance; len -= advance;
1113 ND_PRINT(" src=");
1114 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1115 goto trunc;
1116 bp += advance; len -= advance;
1117 if (len < 8)
1118 goto trunc;
1119 ND_TCHECK_8(bp);
1120 if (GET_U_1(bp) & 0x80)
1121 ND_PRINT(" RPT");
1122 ND_PRINT(" pref=%u", GET_BE_U_4(bp) & 0x7fffffff);
1123 ND_PRINT(" metric=%u", GET_BE_U_4(bp + 4));
1124 break;
1125
1126 case PIMV2_TYPE_CANDIDATE_RP:
1127 {
1128 u_int i, pfxcnt;
1129
1130 /* Prefix-Cnt, Priority, and Holdtime */
1131 if (len < 1)
1132 goto trunc;
1133 ND_PRINT(" prefix-cnt=%u", GET_U_1(bp));
1134 pfxcnt = GET_U_1(bp);
1135 if (len < 2)
1136 goto trunc;
1137 ND_PRINT(" prio=%u", GET_U_1(bp + 1));
1138 if (len < 4)
1139 goto trunc;
1140 ND_PRINT(" holdtime=");
1141 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
1142 bp += 4;
1143 len -= 4;
1144
1145 /* Encoded-Unicast-RP-Address */
1146 ND_PRINT(" RP=");
1147 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1148 goto trunc;
1149 bp += advance;
1150 len -= advance;
1151
1152 /* Encoded-Group Addresses */
1153 for (i = 0; i < pfxcnt && len > 0; i++) {
1154 ND_PRINT(" Group%u=", i);
1155 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1156 goto trunc;
1157 bp += advance;
1158 len -= advance;
1159 }
1160 break;
1161 }
1162
1163 case PIMV2_TYPE_PRUNE_REFRESH:
1164 ND_PRINT(" src=");
1165 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1166 goto trunc;
1167 bp += advance;
1168 len -= advance;
1169 ND_PRINT(" grp=");
1170 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1171 goto trunc;
1172 bp += advance;
1173 len -= advance;
1174 ND_PRINT(" forwarder=");
1175 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1176 goto trunc;
1177 bp += advance;
1178 len -= advance;
1179 if (len < 2)
1180 goto trunc;
1181 ND_PRINT(" TUNR ");
1182 unsigned_relts_print(ndo, GET_BE_U_2(bp));
1183 break;
1184
1185 case PIMV2_TYPE_DF_ELECTION:
1186 subtype = PIM_SUBTYPE(GET_U_1(pim->pim_rsv));
1187 ND_PRINT("\n\t %s,", tok2str( pimv2_df_election_flag_values,
1188 "Unknown", subtype) );
1189
1190 ND_PRINT(" rpa=");
1191 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1192 goto trunc;
1193 }
1194 bp += advance;
1195 len -= advance;
1196 ND_PRINT(" sender pref=%u", GET_BE_U_4(bp) );
1197 ND_PRINT(" sender metric=%u", GET_BE_U_4(bp + 4));
1198
1199 bp += 8;
1200 len -= 8;
1201
1202 switch (subtype) {
1203 case PIMV2_DF_ELECTION_BACKOFF:
1204 case PIMV2_DF_ELECTION_PASS:
1205 ND_PRINT("\n\t %s addr=", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype));
1206 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1207 goto trunc;
1208 }
1209 bp += advance;
1210 len -= advance;
1211
1212 ND_PRINT(" %s pref=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp) );
1213 ND_PRINT(" %s metric=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp + 4));
1214
1215 bp += 8;
1216 len -= 8;
1217
1218 if (subtype == PIMV2_DF_ELECTION_BACKOFF) {
1219 ND_PRINT(" interval %dms", GET_BE_U_2(bp));
1220 }
1221
1222 break;
1223 default:
1224 break;
1225 }
1226 break;
1227
1228 default:
1229 ND_PRINT(" [type %u]", PIM_TYPE(pim_typever));
1230 break;
1231 }
1232
1233 return;
1234
1235 trunc:
1236 nd_print_trunc(ndo);
1237 }
[mirror] the TCPdump network dissector