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