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Merge branch 'master' into macsec
[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 ND_TCHECK_LEN(bp, sizeof(nd_ipv4));
193 if (ndo->ndo_vflag > 1)
194 ND_PRINT("\n");
195 ND_PRINT(" Upstream Nbr: %s", GET_IPADDR_STRING(bp));
196 bp += 4;
197 len -= 4;
198 if (len < 4)
199 goto trunc;
200 ND_TCHECK_2(bp + 2);
201 if (ndo->ndo_vflag > 1)
202 ND_PRINT("\n");
203 ND_PRINT(" Hold time: ");
204 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
205 if (ndo->ndo_vflag < 2)
206 return;
207 bp += 4;
208 len -= 4;
209
210 if (len < 4)
211 goto trunc;
212 ND_TCHECK_4(bp);
213 ngroups = GET_U_1(bp + 3);
214 bp += 4;
215 len -= 4;
216 while (ngroups != 0) {
217 /*
218 * XXX - does the address have length "addrlen" and the
219 * mask length "maddrlen"?
220 */
221 if (len < 4)
222 goto trunc;
223 ND_TCHECK_LEN(bp, sizeof(nd_ipv4));
224 ND_PRINT("\n\tGroup: %s", GET_IPADDR_STRING(bp));
225 bp += 4;
226 len -= 4;
227 if (len < 4)
228 goto trunc;
229 ND_TCHECK_LEN(bp, sizeof(nd_ipv4));
230 if (GET_BE_U_4(bp) != 0xffffffff)
231 ND_PRINT("/%s", GET_IPADDR_STRING(bp));
232 bp += 4;
233 len -= 4;
234 if (len < 4)
235 goto trunc;
236 ND_TCHECK_4(bp);
237 njoin = GET_BE_U_2(bp);
238 nprune = GET_BE_U_2(bp + 2);
239 ND_PRINT(" joined: %u pruned: %u", njoin, nprune);
240 bp += 4;
241 len -= 4;
242 for (njp = 0; njp < (njoin + nprune); njp++) {
243 const char *type;
244
245 if (njp < njoin)
246 type = "Join ";
247 else
248 type = "Prune";
249 if (len < 6)
250 goto trunc;
251 ND_TCHECK_6(bp);
252 ND_PRINT("\n\t%s %s%s%s%s/%u", type,
253 (GET_U_1(bp) & 0x01) ? "Sparse " : "Dense ",
254 (GET_U_1(bp + 1) & 0x80) ? "WC " : "",
255 (GET_U_1(bp + 1) & 0x40) ? "RP " : "SPT ",
256 GET_IPADDR_STRING(bp + 2),
257 GET_U_1(bp + 1) & 0x3f);
258 bp += 6;
259 len -= 6;
260 }
261 ngroups--;
262 }
263 return;
264 trunc:
265 nd_print_trunc(ndo);
266 return;
267 }
268
269 void
270 pimv1_print(netdissect_options *ndo,
271 const u_char *bp, u_int len)
272 {
273 u_char type;
274
275 ndo->ndo_protocol = "pimv1";
276 ND_TCHECK_1(bp + 1);
277 type = GET_U_1(bp + 1);
278
279 ND_PRINT(" %s", tok2str(pimv1_type_str, "[type %u]", type));
280 switch (type) {
281 case PIMV1_TYPE_QUERY:
282 if (ND_TTEST_1(bp + 8)) {
283 switch (GET_U_1(bp + 8) >> 4) {
284 case 0:
285 ND_PRINT(" Dense-mode");
286 break;
287 case 1:
288 ND_PRINT(" Sparse-mode");
289 break;
290 case 2:
291 ND_PRINT(" Sparse-Dense-mode");
292 break;
293 default:
294 ND_PRINT(" mode-%u", GET_U_1(bp + 8) >> 4);
295 break;
296 }
297 }
298 if (ndo->ndo_vflag) {
299 ND_TCHECK_2(bp + 10);
300 ND_PRINT(" (Hold-time ");
301 unsigned_relts_print(ndo, GET_BE_U_2(bp + 10));
302 ND_PRINT(")");
303 }
304 break;
305
306 case PIMV1_TYPE_REGISTER:
307 ND_TCHECK_LEN(bp + 8, 20); /* ip header */
308 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 20),
309 GET_IPADDR_STRING(bp + 24));
310 break;
311 case PIMV1_TYPE_REGISTER_STOP:
312 ND_TCHECK_LEN(bp + 12, sizeof(nd_ipv4));
313 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 8),
314 GET_IPADDR_STRING(bp + 12));
315 break;
316 case PIMV1_TYPE_RP_REACHABILITY:
317 if (ndo->ndo_vflag) {
318 ND_TCHECK_2(bp + 22);
319 ND_PRINT(" group %s", GET_IPADDR_STRING(bp + 8));
320 if (GET_BE_U_4(bp + 12) != 0xffffffff)
321 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
322 ND_PRINT(" RP %s hold ", GET_IPADDR_STRING(bp + 16));
323 unsigned_relts_print(ndo, GET_BE_U_2(bp + 22));
324 }
325 break;
326 case PIMV1_TYPE_ASSERT:
327 ND_TCHECK_LEN(bp + 16, sizeof(nd_ipv4));
328 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 16),
329 GET_IPADDR_STRING(bp + 8));
330 if (GET_BE_U_4(bp + 12) != 0xffffffff)
331 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
332 ND_TCHECK_4(bp + 24);
333 ND_PRINT(" %s pref %u metric %u",
334 (GET_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT",
335 GET_BE_U_4(bp + 20) & 0x7fffffff,
336 GET_BE_U_4(bp + 24));
337 break;
338 case PIMV1_TYPE_JOIN_PRUNE:
339 case PIMV1_TYPE_GRAFT:
340 case PIMV1_TYPE_GRAFT_ACK:
341 if (ndo->ndo_vflag) {
342 if (len < 8)
343 goto trunc;
344 pimv1_join_prune_print(ndo, bp + 8, len - 8);
345 }
346 break;
347 }
348 ND_TCHECK_1(bp + 4);
349 if ((GET_U_1(bp + 4) >> 4) != 1)
350 ND_PRINT(" [v%u]", GET_U_1(bp + 4) >> 4);
351 return;
352
353 trunc:
354 nd_print_trunc(ndo);
355 return;
356 }
357
358 /*
359 * auto-RP is a cisco protocol, documented at
360 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
361 *
362 * This implements version 1+, dated Sept 9, 1998.
363 */
364 void
365 cisco_autorp_print(netdissect_options *ndo,
366 const u_char *bp, u_int len)
367 {
368 u_int type;
369 u_int numrps;
370 u_int hold;
371
372 ndo->ndo_protocol = "cisco_autorp";
373 if (len < 8)
374 goto trunc;
375 ND_TCHECK_1(bp);
376 ND_PRINT(" auto-rp ");
377 type = GET_U_1(bp);
378 switch (type) {
379 case 0x11:
380 ND_PRINT("candidate-advert");
381 break;
382 case 0x12:
383 ND_PRINT("mapping");
384 break;
385 default:
386 ND_PRINT("type-0x%02x", type);
387 break;
388 }
389
390 ND_TCHECK_1(bp + 1);
391 numrps = GET_U_1(bp + 1);
392
393 ND_TCHECK_2(bp + 2);
394 ND_PRINT(" Hold ");
395 hold = GET_BE_U_2(bp + 2);
396 if (hold)
397 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
398 else
399 ND_PRINT("FOREVER");
400
401 /* Next 4 bytes are reserved. */
402
403 bp += 8; len -= 8;
404
405 /*XXX skip unless -v? */
406
407 /*
408 * Rest of packet:
409 * numrps entries of the form:
410 * 32 bits: RP
411 * 6 bits: reserved
412 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
413 * 8 bits: # of entries for this RP
414 * each entry: 7 bits: reserved, 1 bit: negative,
415 * 8 bits: mask 32 bits: source
416 * lather, rinse, repeat.
417 */
418 while (numrps != 0) {
419 u_int nentries;
420 char s;
421
422 if (len < 4)
423 goto trunc;
424 ND_TCHECK_4(bp);
425 ND_PRINT(" RP %s", GET_IPADDR_STRING(bp));
426 bp += 4;
427 len -= 4;
428 if (len < 1)
429 goto trunc;
430 ND_TCHECK_1(bp);
431 switch (GET_U_1(bp) & 0x3) {
432 case 0: ND_PRINT(" PIMv?");
433 break;
434 case 1: ND_PRINT(" PIMv1");
435 break;
436 case 2: ND_PRINT(" PIMv2");
437 break;
438 case 3: ND_PRINT(" PIMv1+2");
439 break;
440 }
441 if (GET_U_1(bp) & 0xfc)
442 ND_PRINT(" [rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
443 bp += 1;
444 len -= 1;
445 if (len < 1)
446 goto trunc;
447 ND_TCHECK_1(bp);
448 nentries = GET_U_1(bp);
449 bp += 1;
450 len -= 1;
451 s = ' ';
452 while (nentries != 0) {
453 if (len < 6)
454 goto trunc;
455 ND_TCHECK_6(bp);
456 ND_PRINT("%c%s%s/%u", s, GET_U_1(bp) & 1 ? "!" : "",
457 GET_IPADDR_STRING(bp + 2), GET_U_1(bp + 1));
458 if (GET_U_1(bp) & 0x02) {
459 ND_PRINT(" bidir");
460 }
461 if (GET_U_1(bp) & 0xfc) {
462 ND_PRINT("[rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
463 }
464 s = ',';
465 bp += 6; len -= 6;
466 nentries--;
467 }
468 numrps--;
469 }
470 return;
471
472 trunc:
473 nd_print_trunc(ndo);
474 return;
475 }
476
477 void
478 pim_print(netdissect_options *ndo,
479 const u_char *bp, u_int len, const u_char *bp2)
480 {
481 const struct pim *pim = (const struct pim *)bp;
482 uint8_t pim_typever;
483
484 ndo->ndo_protocol = "pim";
485 #ifdef notyet /* currently we see only version and type */
486 ND_TCHECK_1(pim->pim_rsv);
487 #endif
488
489 ND_TCHECK_1(pim->pim_typever);
490 pim_typever = GET_U_1(pim->pim_typever);
491 switch (PIM_VER(pim_typever)) {
492 case 2:
493 if (!ndo->ndo_vflag) {
494 ND_PRINT("PIMv%u, %s, length %u",
495 PIM_VER(pim_typever),
496 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)),
497 len);
498 return;
499 } else {
500 ND_PRINT("PIMv%u, length %u\n\t%s",
501 PIM_VER(pim_typever),
502 len,
503 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)));
504 pimv2_print(ndo, bp, len, bp2);
505 }
506 break;
507 default:
508 ND_PRINT("PIMv%u, length %u",
509 PIM_VER(pim_typever),
510 len);
511 break;
512 }
513 return;
514
515 trunc:
516 nd_print_trunc(ndo);
517 return;
518 }
519
520 /*
521 * PIMv2 uses encoded address representations.
522 *
523 * The last PIM-SM I-D before RFC2117 was published specified the
524 * following representation for unicast addresses. However, RFC2117
525 * specified no encoding for unicast addresses with the unicast
526 * address length specified in the header. Therefore, we have to
527 * guess which encoding is being used (Cisco's PIMv2 implementation
528 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
529 * field into a 'unicast-address-length-in-bytes' field. We guess
530 * that it's the draft encoding if this reserved field is zero.
531 *
532 * RFC2362 goes back to the encoded format, and calls the addr length
533 * field "reserved" again.
534 *
535 * The first byte is the address family, from:
536 *
537 * 0 Reserved
538 * 1 IP (IP version 4)
539 * 2 IP6 (IP version 6)
540 * 3 NSAP
541 * 4 HDLC (8-bit multidrop)
542 * 5 BBN 1822
543 * 6 802 (includes all 802 media plus Ethernet "canonical format")
544 * 7 E.163
545 * 8 E.164 (SMDS, Frame Relay, ATM)
546 * 9 F.69 (Telex)
547 * 10 X.121 (X.25, Frame Relay)
548 * 11 IPX
549 * 12 Appletalk
550 * 13 Decnet IV
551 * 14 Banyan Vines
552 * 15 E.164 with NSAP format subaddress
553 *
554 * In addition, the second byte is an "Encoding". 0 is the default
555 * encoding for the address family, and no other encodings are currently
556 * specified.
557 *
558 */
559
560 enum pimv2_addrtype {
561 pimv2_unicast, pimv2_group, pimv2_source
562 };
563
564 /* 0 1 2 3
565 * 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
566 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
567 * | Addr Family | Encoding Type | Unicast Address |
568 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
569 * 0 1 2 3
570 * 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
571 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
572 * | Addr Family | Encoding Type | Reserved | Mask Len |
573 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
574 * | Group multicast Address |
575 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
576 * 0 1 2 3
577 * 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
578 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
579 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
580 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
581 * | Source Address |
582 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
583 */
584 static int
585 pimv2_addr_print(netdissect_options *ndo,
586 const u_char *bp, u_int len, enum pimv2_addrtype at,
587 u_int addr_len, int silent)
588 {
589 u_int af;
590 int hdrlen;
591
592 if (addr_len == 0) {
593 if (len < 2)
594 goto trunc;
595 ND_TCHECK_1(bp + 1);
596 switch (GET_U_1(bp)) {
597 case 1:
598 af = AF_INET;
599 addr_len = (u_int)sizeof(nd_ipv4);
600 break;
601 case 2:
602 af = AF_INET6;
603 addr_len = (u_int)sizeof(nd_ipv6);
604 break;
605 default:
606 return -1;
607 }
608 if (GET_U_1(bp + 1) != 0)
609 return -1;
610 hdrlen = 2;
611 } else {
612 switch (addr_len) {
613 case sizeof(nd_ipv4):
614 af = AF_INET;
615 break;
616 case sizeof(nd_ipv6):
617 af = AF_INET6;
618 break;
619 default:
620 return -1;
621 break;
622 }
623 hdrlen = 0;
624 }
625
626 bp += hdrlen;
627 len -= hdrlen;
628 switch (at) {
629 case pimv2_unicast:
630 if (len < addr_len)
631 goto trunc;
632 ND_TCHECK_LEN(bp, addr_len);
633 if (af == AF_INET) {
634 if (!silent)
635 ND_PRINT("%s", GET_IPADDR_STRING(bp));
636 }
637 else if (af == AF_INET6) {
638 if (!silent)
639 ND_PRINT("%s", GET_IP6ADDR_STRING(bp));
640 }
641 return hdrlen + addr_len;
642 case pimv2_group:
643 case pimv2_source:
644 if (len < addr_len + 2)
645 goto trunc;
646 ND_TCHECK_LEN(bp, addr_len + 2);
647 if (af == AF_INET) {
648 if (!silent) {
649 ND_PRINT("%s", GET_IPADDR_STRING(bp + 2));
650 if (GET_U_1(bp + 1) != 32)
651 ND_PRINT("/%u", GET_U_1(bp + 1));
652 }
653 }
654 else if (af == AF_INET6) {
655 if (!silent) {
656 ND_PRINT("%s", GET_IP6ADDR_STRING(bp + 2));
657 if (GET_U_1(bp + 1) != 128)
658 ND_PRINT("/%u", GET_U_1(bp + 1));
659 }
660 }
661 if (GET_U_1(bp) && !silent) {
662 if (at == pimv2_group) {
663 ND_PRINT("(0x%02x)", GET_U_1(bp));
664 } else {
665 ND_PRINT("(%s%s%s",
666 GET_U_1(bp) & 0x04 ? "S" : "",
667 GET_U_1(bp) & 0x02 ? "W" : "",
668 GET_U_1(bp) & 0x01 ? "R" : "");
669 if (GET_U_1(bp) & 0xf8) {
670 ND_PRINT("+0x%02x",
671 GET_U_1(bp) & 0xf8);
672 }
673 ND_PRINT(")");
674 }
675 }
676 return hdrlen + 2 + addr_len;
677 default:
678 return -1;
679 }
680 trunc:
681 return -1;
682 }
683
684 enum checksum_status {
685 CORRECT,
686 INCORRECT,
687 UNVERIFIED
688 };
689
690 static enum checksum_status
691 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
692 const u_char *bp2, u_int len)
693 {
694 const struct ip *ip;
695 u_int cksum;
696
697 if (!ND_TTEST_LEN(bp, len)) {
698 /* We don't have all the data. */
699 return (UNVERIFIED);
700 }
701 ip = (const struct ip *)bp2;
702 if (IP_V(ip) == 4) {
703 struct cksum_vec vec[1];
704
705 vec[0].ptr = bp;
706 vec[0].len = len;
707 cksum = in_cksum(vec, 1);
708 return (cksum ? INCORRECT : CORRECT);
709 } else if (IP_V(ip) == 6) {
710 const struct ip6_hdr *ip6;
711
712 ip6 = (const struct ip6_hdr *)bp2;
713 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
714 return (cksum ? INCORRECT : CORRECT);
715 } else {
716 return (UNVERIFIED);
717 }
718 }
719
720 static void
721 pimv2_print(netdissect_options *ndo,
722 const u_char *bp, u_int len, const u_char *bp2)
723 {
724 const struct pim *pim = (const struct pim *)bp;
725 int advance;
726 int subtype;
727 enum checksum_status cksum_status;
728 u_int pim_typever;
729 u_int pimv2_addr_len;
730
731 ndo->ndo_protocol = "pimv2";
732 if (len < 2) {
733 ND_PRINT("[length %u < 2]", len);
734 nd_print_invalid(ndo);
735 return;
736 }
737 ND_TCHECK_1(pim->pim_rsv);
738 pim_typever = GET_U_1(pim->pim_typever);
739 /* RFC5015 allocates the high 4 bits of pim_rsv for "subtype". */
740 pimv2_addr_len = GET_U_1(pim->pim_rsv) & 0x0f;
741 if (pimv2_addr_len != 0)
742 ND_PRINT(", RFC2117-encoding");
743
744 if (len < 4) {
745 ND_PRINT("[length %u < 4]", len);
746 nd_print_invalid(ndo);
747 return;
748 }
749 ND_TCHECK_2(pim->pim_cksum);
750 ND_PRINT(", cksum 0x%04x ", GET_BE_U_2(pim->pim_cksum));
751 if (GET_BE_U_2(pim->pim_cksum) == 0) {
752 ND_PRINT("(unverified)");
753 } else {
754 if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) {
755 /*
756 * The checksum only covers the packet header,
757 * not the encapsulated packet.
758 */
759 cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
760 if (cksum_status == INCORRECT) {
761 /*
762 * To quote RFC 4601, "For interoperability
763 * reasons, a message carrying a checksum
764 * calculated over the entire PIM Register
765 * message should also be accepted."
766 */
767 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
768 }
769 } else {
770 /*
771 * The checksum covers the entire packet.
772 */
773 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
774 }
775 switch (cksum_status) {
776
777 case CORRECT:
778 ND_PRINT("(correct)");
779 break;
780
781 case INCORRECT:
782 ND_PRINT("(incorrect)");
783 break;
784
785 case UNVERIFIED:
786 ND_PRINT("(unverified)");
787 break;
788 }
789 }
790 bp += 4;
791 len -= 4;
792
793 switch (PIM_TYPE(pim_typever)) {
794 case PIMV2_TYPE_HELLO:
795 {
796 uint16_t otype, olen;
797 while (len > 0) {
798 if (len < 4)
799 goto trunc;
800 ND_TCHECK_4(bp);
801 otype = GET_BE_U_2(bp);
802 olen = GET_BE_U_2(bp + 2);
803 ND_PRINT("\n\t %s Option (%u), length %u, Value: ",
804 tok2str(pimv2_hello_option_values, "Unknown", otype),
805 otype,
806 olen);
807 bp += 4;
808 len -= 4;
809
810 if (len < olen)
811 goto trunc;
812 ND_TCHECK_LEN(bp, olen);
813 switch (otype) {
814 case PIMV2_HELLO_OPTION_HOLDTIME:
815 if (olen != 2) {
816 ND_PRINT("[option length %u != 2]", olen);
817 nd_print_invalid(ndo);
818 return;
819 } else {
820 unsigned_relts_print(ndo,
821 GET_BE_U_2(bp));
822 }
823 break;
824
825 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
826 if (olen != 4) {
827 ND_PRINT("[option length %u != 4]", olen);
828 nd_print_invalid(ndo);
829 return;
830 } else {
831 char t_bit;
832 uint16_t lan_delay, override_interval;
833 lan_delay = GET_BE_U_2(bp);
834 override_interval = GET_BE_U_2(bp + 2);
835 t_bit = (lan_delay & 0x8000)? 1 : 0;
836 lan_delay &= ~0x8000;
837 ND_PRINT("\n\t T-bit=%u, LAN delay %ums, Override interval %ums",
838 t_bit, lan_delay, override_interval);
839 }
840 break;
841
842 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
843 case PIMV2_HELLO_OPTION_DR_PRIORITY:
844 switch (olen) {
845 case 0:
846 ND_PRINT("Bi-Directional Capability (Old)");
847 break;
848 case 4:
849 ND_PRINT("%u", GET_BE_U_4(bp));
850 break;
851 default:
852 ND_PRINT("[option length %u != 4]", olen);
853 nd_print_invalid(ndo);
854 return;
855 break;
856 }
857 break;
858
859 case PIMV2_HELLO_OPTION_GENID:
860 if (olen != 4) {
861 ND_PRINT("[option length %u != 4]", olen);
862 nd_print_invalid(ndo);
863 return;
864 } else {
865 ND_PRINT("0x%08x", GET_BE_U_4(bp));
866 }
867 break;
868
869 case PIMV2_HELLO_OPTION_REFRESH_CAP:
870 if (olen != 4) {
871 ND_PRINT("[option length %u != 4]", olen);
872 nd_print_invalid(ndo);
873 return;
874 } else {
875 ND_PRINT("v%u", GET_U_1(bp));
876 if (GET_U_1(bp + 1) != 0) {
877 ND_PRINT(", interval ");
878 unsigned_relts_print(ndo,
879 GET_U_1(bp + 1));
880 }
881 if (GET_BE_U_2(bp + 2) != 0) {
882 ND_PRINT(" ?0x%04x?",
883 GET_BE_U_2(bp + 2));
884 }
885 }
886 break;
887
888 case PIMV2_HELLO_OPTION_BIDIR_CAP:
889 break;
890
891 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
892 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
893 if (ndo->ndo_vflag > 1) {
894 const u_char *ptr = bp;
895 u_int plen = len;
896 while (ptr < (bp+olen)) {
897 ND_PRINT("\n\t ");
898 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
899 if (advance < 0)
900 goto trunc;
901 ptr += advance;
902 plen -= advance;
903 }
904 }
905 break;
906 default:
907 if (ndo->ndo_vflag <= 1)
908 print_unknown_data(ndo, bp, "\n\t ", olen);
909 break;
910 }
911 /* do we want to see an additionally hexdump ? */
912 if (ndo->ndo_vflag> 1)
913 print_unknown_data(ndo, bp, "\n\t ", olen);
914 bp += olen;
915 len -= olen;
916 }
917 break;
918 }
919
920 case PIMV2_TYPE_REGISTER:
921 {
922 const struct ip *ip;
923
924 if (len < 4)
925 goto trunc;
926 ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN);
927
928 ND_PRINT(", Flags [ %s ]\n\t",
929 tok2str(pimv2_register_flag_values,
930 "none",
931 GET_BE_U_4(bp)));
932
933 bp += 4; len -= 4;
934 /* encapsulated multicast packet */
935 if (len == 0)
936 goto trunc;
937 ip = (const struct ip *)bp;
938 ND_TCHECK_1(ip->ip_vhl);
939 switch (IP_V(ip)) {
940 case 0: /* Null header */
941 ND_TCHECK_4(ip->ip_dst);
942 ND_PRINT("IP-Null-header %s > %s",
943 GET_IPADDR_STRING(ip->ip_src),
944 GET_IPADDR_STRING(ip->ip_dst));
945 break;
946
947 case 4: /* IPv4 */
948 ip_print(ndo, bp, len);
949 break;
950
951 case 6: /* IPv6 */
952 ip6_print(ndo, bp, len);
953 break;
954
955 default:
956 ND_PRINT("IP ver %u", IP_V(ip));
957 break;
958 }
959 break;
960 }
961
962 case PIMV2_TYPE_REGISTER_STOP:
963 ND_PRINT(" group=");
964 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
965 goto trunc;
966 bp += advance; len -= advance;
967 ND_PRINT(" source=");
968 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
969 goto trunc;
970 bp += advance; len -= advance;
971 break;
972
973 case PIMV2_TYPE_JOIN_PRUNE:
974 case PIMV2_TYPE_GRAFT:
975 case PIMV2_TYPE_GRAFT_ACK:
976
977
978 /*
979 * 0 1 2 3
980 * 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
981 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
982 * |PIM Ver| Type | Addr length | Checksum |
983 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
984 * | Unicast-Upstream Neighbor Address |
985 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
986 * | Reserved | Num groups | Holdtime |
987 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
988 * | Encoded-Multicast Group Address-1 |
989 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
990 * | Number of Joined Sources | Number of Pruned Sources |
991 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
992 * | Encoded-Joined Source Address-1 |
993 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
994 * | . |
995 * | . |
996 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
997 * | Encoded-Joined Source Address-n |
998 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
999 * | Encoded-Pruned Source Address-1 |
1000 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1001 * | . |
1002 * | . |
1003 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1004 * | Encoded-Pruned Source Address-n |
1005 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1006 * | . |
1007 * | . |
1008 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1009 * | Encoded-Multicast Group Address-n |
1010 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
1011 */
1012
1013 {
1014 uint8_t ngroup;
1015 uint16_t holdtime;
1016 uint16_t njoin;
1017 uint16_t nprune;
1018 u_int i, j;
1019
1020 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
1021 ND_PRINT(", upstream-neighbor: ");
1022 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1023 goto trunc;
1024 bp += advance; len -= advance;
1025 }
1026 if (len < 4)
1027 goto trunc;
1028 ND_TCHECK_4(bp);
1029 ngroup = GET_U_1(bp + 1);
1030 holdtime = GET_BE_U_2(bp + 2);
1031 ND_PRINT("\n\t %u group(s)", ngroup);
1032 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
1033 ND_PRINT(", holdtime: ");
1034 if (holdtime == 0xffff)
1035 ND_PRINT("infinite");
1036 else
1037 unsigned_relts_print(ndo, holdtime);
1038 }
1039 bp += 4; len -= 4;
1040 for (i = 0; i < ngroup; i++) {
1041 ND_PRINT("\n\t group #%u: ", i+1);
1042 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1043 goto trunc;
1044 bp += advance; len -= advance;
1045 if (len < 4)
1046 goto trunc;
1047 ND_TCHECK_4(bp);
1048 njoin = GET_BE_U_2(bp);
1049 nprune = GET_BE_U_2(bp + 2);
1050 ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune);
1051 bp += 4; len -= 4;
1052 for (j = 0; j < njoin; j++) {
1053 ND_PRINT("\n\t joined source #%u: ", j+1);
1054 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1055 goto trunc;
1056 bp += advance; len -= advance;
1057 }
1058 for (j = 0; j < nprune; j++) {
1059 ND_PRINT("\n\t pruned source #%u: ", j+1);
1060 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1061 goto trunc;
1062 bp += advance; len -= advance;
1063 }
1064 }
1065 break;
1066 }
1067
1068 case PIMV2_TYPE_BOOTSTRAP:
1069 {
1070 u_int i, j, frpcnt;
1071
1072 /* Fragment Tag, Hash Mask len, and BSR-priority */
1073 if (len < 2)
1074 goto trunc;
1075 ND_TCHECK_2(bp);
1076 ND_PRINT(" tag=%x", GET_BE_U_2(bp));
1077 bp += 2;
1078 len -= 2;
1079 if (len < 1)
1080 goto trunc;
1081 ND_TCHECK_1(bp);
1082 ND_PRINT(" hashmlen=%u", GET_U_1(bp));
1083 if (len < 2)
1084 goto trunc;
1085 ND_TCHECK_1(bp + 2);
1086 ND_PRINT(" BSRprio=%u", GET_U_1(bp + 1));
1087 bp += 2;
1088 len -= 2;
1089
1090 /* Encoded-Unicast-BSR-Address */
1091 ND_PRINT(" BSR=");
1092 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1093 goto trunc;
1094 bp += advance;
1095 len -= advance;
1096
1097 for (i = 0; len > 0; i++) {
1098 /* Encoded-Group Address */
1099 ND_PRINT(" (group%u: ", i);
1100 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1101 goto trunc;
1102 bp += advance;
1103 len -= advance;
1104
1105 /* RP-Count, Frag RP-Cnt, and rsvd */
1106 if (len < 1)
1107 goto trunc;
1108 ND_TCHECK_1(bp);
1109 ND_PRINT(" RPcnt=%u", GET_U_1(bp));
1110 if (len < 2)
1111 goto trunc;
1112 ND_TCHECK_1(bp + 1);
1113 frpcnt = GET_U_1(bp + 1);
1114 ND_PRINT(" FRPcnt=%u", frpcnt);
1115 if (len < 4)
1116 goto trunc;
1117 bp += 4;
1118 len -= 4;
1119
1120 for (j = 0; j < frpcnt && len > 0; j++) {
1121 /* each RP info */
1122 ND_PRINT(" RP%u=", j);
1123 if ((advance = pimv2_addr_print(ndo, bp, len,
1124 pimv2_unicast,
1125 pimv2_addr_len,
1126 0)) < 0)
1127 goto trunc;
1128 bp += advance;
1129 len -= advance;
1130
1131 if (len < 2)
1132 goto trunc;
1133 ND_TCHECK_2(bp);
1134 ND_PRINT(",holdtime=");
1135 unsigned_relts_print(ndo,
1136 GET_BE_U_2(bp));
1137 if (len < 3)
1138 goto trunc;
1139 ND_TCHECK_1(bp + 2);
1140 ND_PRINT(",prio=%u", GET_U_1(bp + 2));
1141 if (len < 4)
1142 goto trunc;
1143 bp += 4;
1144 len -= 4;
1145 }
1146 ND_PRINT(")");
1147 }
1148 break;
1149 }
1150 case PIMV2_TYPE_ASSERT:
1151 ND_PRINT(" group=");
1152 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1153 goto trunc;
1154 bp += advance; len -= advance;
1155 ND_PRINT(" src=");
1156 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1157 goto trunc;
1158 bp += advance; len -= advance;
1159 if (len < 8)
1160 goto trunc;
1161 ND_TCHECK_8(bp);
1162 if (GET_U_1(bp) & 0x80)
1163 ND_PRINT(" RPT");
1164 ND_PRINT(" pref=%u", GET_BE_U_4(bp) & 0x7fffffff);
1165 ND_PRINT(" metric=%u", GET_BE_U_4(bp + 4));
1166 break;
1167
1168 case PIMV2_TYPE_CANDIDATE_RP:
1169 {
1170 u_int i, pfxcnt;
1171
1172 /* Prefix-Cnt, Priority, and Holdtime */
1173 if (len < 1)
1174 goto trunc;
1175 ND_TCHECK_1(bp);
1176 ND_PRINT(" prefix-cnt=%u", GET_U_1(bp));
1177 pfxcnt = GET_U_1(bp);
1178 if (len < 2)
1179 goto trunc;
1180 ND_TCHECK_1(bp + 1);
1181 ND_PRINT(" prio=%u", GET_U_1(bp + 1));
1182 if (len < 4)
1183 goto trunc;
1184 ND_TCHECK_2(bp + 2);
1185 ND_PRINT(" holdtime=");
1186 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
1187 bp += 4;
1188 len -= 4;
1189
1190 /* Encoded-Unicast-RP-Address */
1191 ND_PRINT(" RP=");
1192 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1193 goto trunc;
1194 bp += advance;
1195 len -= advance;
1196
1197 /* Encoded-Group Addresses */
1198 for (i = 0; i < pfxcnt && len > 0; i++) {
1199 ND_PRINT(" Group%u=", i);
1200 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1201 goto trunc;
1202 bp += advance;
1203 len -= advance;
1204 }
1205 break;
1206 }
1207
1208 case PIMV2_TYPE_PRUNE_REFRESH:
1209 ND_PRINT(" src=");
1210 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1211 goto trunc;
1212 bp += advance;
1213 len -= advance;
1214 ND_PRINT(" grp=");
1215 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1216 goto trunc;
1217 bp += advance;
1218 len -= advance;
1219 ND_PRINT(" forwarder=");
1220 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1221 goto trunc;
1222 bp += advance;
1223 len -= advance;
1224 if (len < 2)
1225 goto trunc;
1226 ND_TCHECK_2(bp);
1227 ND_PRINT(" TUNR ");
1228 unsigned_relts_print(ndo, GET_BE_U_2(bp));
1229 break;
1230
1231 case PIMV2_TYPE_DF_ELECTION:
1232 subtype = PIM_SUBTYPE(GET_U_1(pim->pim_rsv));
1233 ND_PRINT("\n\t %s,", tok2str( pimv2_df_election_flag_values,
1234 "Unknown", subtype) );
1235
1236 ND_PRINT(" rpa=");
1237 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1238 goto trunc;
1239 }
1240 bp += advance;
1241 len -= advance;
1242 ND_PRINT(" sender pref=%u", GET_BE_U_4(bp) );
1243 ND_PRINT(" sender metric=%u", GET_BE_U_4(bp + 4));
1244
1245 bp += 8;
1246 len -= 8;
1247
1248 switch (subtype) {
1249 case PIMV2_DF_ELECTION_BACKOFF:
1250 case PIMV2_DF_ELECTION_PASS:
1251 ND_PRINT("\n\t %s addr=", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype));
1252 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1253 goto trunc;
1254 }
1255 bp += advance;
1256 len -= advance;
1257
1258 ND_PRINT(" %s pref=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp) );
1259 ND_PRINT(" %s metric=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp + 4));
1260
1261 bp += 8;
1262 len -= 8;
1263
1264 if (subtype == PIMV2_DF_ELECTION_BACKOFF) {
1265 ND_PRINT(" interval %dms", GET_BE_U_2(bp));
1266 }
1267
1268 break;
1269 default:
1270 break;
1271 }
1272 break;
1273
1274 default:
1275 ND_PRINT(" [type %u]", PIM_TYPE(pim_typever));
1276 break;
1277 }
1278
1279 return;
1280
1281 trunc:
1282 nd_print_trunc(ndo);
1283 }
[mirror] the TCPdump network dissector