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Remove 96 assorted ND_TCHECK calls.
[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 if (ndo->ndo_vflag > 1)
201 ND_PRINT("\n");
202 ND_PRINT(" Hold time: ");
203 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
204 if (ndo->ndo_vflag < 2)
205 return;
206 bp += 4;
207 len -= 4;
208
209 if (len < 4)
210 goto trunc;
211 ngroups = GET_U_1(bp + 3);
212 bp += 4;
213 len -= 4;
214 while (ngroups != 0) {
215 /*
216 * XXX - does the address have length "addrlen" and the
217 * mask length "maddrlen"?
218 */
219 if (len < 4)
220 goto trunc;
221 ND_TCHECK_LEN(bp, sizeof(nd_ipv4));
222 ND_PRINT("\n\tGroup: %s", GET_IPADDR_STRING(bp));
223 bp += 4;
224 len -= 4;
225 if (len < 4)
226 goto trunc;
227 ND_TCHECK_LEN(bp, sizeof(nd_ipv4));
228 if (GET_BE_U_4(bp) != 0xffffffff)
229 ND_PRINT("/%s", GET_IPADDR_STRING(bp));
230 bp += 4;
231 len -= 4;
232 if (len < 4)
233 goto trunc;
234 njoin = GET_BE_U_2(bp);
235 nprune = GET_BE_U_2(bp + 2);
236 ND_PRINT(" joined: %u pruned: %u", njoin, nprune);
237 bp += 4;
238 len -= 4;
239 for (njp = 0; njp < (njoin + nprune); njp++) {
240 const char *type;
241
242 if (njp < njoin)
243 type = "Join ";
244 else
245 type = "Prune";
246 if (len < 6)
247 goto trunc;
248 ND_PRINT("\n\t%s %s%s%s%s/%u", type,
249 (GET_U_1(bp) & 0x01) ? "Sparse " : "Dense ",
250 (GET_U_1(bp + 1) & 0x80) ? "WC " : "",
251 (GET_U_1(bp + 1) & 0x40) ? "RP " : "SPT ",
252 GET_IPADDR_STRING(bp + 2),
253 GET_U_1(bp + 1) & 0x3f);
254 bp += 6;
255 len -= 6;
256 }
257 ngroups--;
258 }
259 return;
260 trunc:
261 nd_print_trunc(ndo);
262 return;
263 }
264
265 void
266 pimv1_print(netdissect_options *ndo,
267 const u_char *bp, u_int len)
268 {
269 u_char type;
270
271 ndo->ndo_protocol = "pimv1";
272 type = GET_U_1(bp + 1);
273
274 ND_PRINT(" %s", tok2str(pimv1_type_str, "[type %u]", type));
275 switch (type) {
276 case PIMV1_TYPE_QUERY:
277 if (ND_TTEST_1(bp + 8)) {
278 switch (GET_U_1(bp + 8) >> 4) {
279 case 0:
280 ND_PRINT(" Dense-mode");
281 break;
282 case 1:
283 ND_PRINT(" Sparse-mode");
284 break;
285 case 2:
286 ND_PRINT(" Sparse-Dense-mode");
287 break;
288 default:
289 ND_PRINT(" mode-%u", GET_U_1(bp + 8) >> 4);
290 break;
291 }
292 }
293 if (ndo->ndo_vflag) {
294 ND_PRINT(" (Hold-time ");
295 unsigned_relts_print(ndo, GET_BE_U_2(bp + 10));
296 ND_PRINT(")");
297 }
298 break;
299
300 case PIMV1_TYPE_REGISTER:
301 ND_TCHECK_LEN(bp + 8, 20); /* ip header */
302 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 20),
303 GET_IPADDR_STRING(bp + 24));
304 break;
305 case PIMV1_TYPE_REGISTER_STOP:
306 ND_TCHECK_LEN(bp + 12, sizeof(nd_ipv4));
307 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 8),
308 GET_IPADDR_STRING(bp + 12));
309 break;
310 case PIMV1_TYPE_RP_REACHABILITY:
311 if (ndo->ndo_vflag) {
312 ND_TCHECK_2(bp + 22);
313 ND_PRINT(" group %s", GET_IPADDR_STRING(bp + 8));
314 if (GET_BE_U_4(bp + 12) != 0xffffffff)
315 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
316 ND_PRINT(" RP %s hold ", GET_IPADDR_STRING(bp + 16));
317 unsigned_relts_print(ndo, GET_BE_U_2(bp + 22));
318 }
319 break;
320 case PIMV1_TYPE_ASSERT:
321 ND_TCHECK_LEN(bp + 16, sizeof(nd_ipv4));
322 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 16),
323 GET_IPADDR_STRING(bp + 8));
324 if (GET_BE_U_4(bp + 12) != 0xffffffff)
325 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
326 ND_PRINT(" %s pref %u metric %u",
327 (GET_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT",
328 GET_BE_U_4(bp + 20) & 0x7fffffff,
329 GET_BE_U_4(bp + 24));
330 break;
331 case PIMV1_TYPE_JOIN_PRUNE:
332 case PIMV1_TYPE_GRAFT:
333 case PIMV1_TYPE_GRAFT_ACK:
334 if (ndo->ndo_vflag) {
335 if (len < 8)
336 goto trunc;
337 pimv1_join_prune_print(ndo, bp + 8, len - 8);
338 }
339 break;
340 }
341 if ((GET_U_1(bp + 4) >> 4) != 1)
342 ND_PRINT(" [v%u]", GET_U_1(bp + 4) >> 4);
343 return;
344
345 trunc:
346 nd_print_trunc(ndo);
347 return;
348 }
349
350 /*
351 * auto-RP is a cisco protocol, documented at
352 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
353 *
354 * This implements version 1+, dated Sept 9, 1998.
355 */
356 void
357 cisco_autorp_print(netdissect_options *ndo,
358 const u_char *bp, u_int len)
359 {
360 u_int type;
361 u_int numrps;
362 u_int hold;
363
364 ndo->ndo_protocol = "cisco_autorp";
365 if (len < 8)
366 goto trunc;
367 ND_PRINT(" auto-rp ");
368 type = GET_U_1(bp);
369 switch (type) {
370 case 0x11:
371 ND_PRINT("candidate-advert");
372 break;
373 case 0x12:
374 ND_PRINT("mapping");
375 break;
376 default:
377 ND_PRINT("type-0x%02x", type);
378 break;
379 }
380
381 numrps = GET_U_1(bp + 1);
382
383 ND_PRINT(" Hold ");
384 hold = GET_BE_U_2(bp + 2);
385 if (hold)
386 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
387 else
388 ND_PRINT("FOREVER");
389
390 /* Next 4 bytes are reserved. */
391
392 bp += 8; len -= 8;
393
394 /*XXX skip unless -v? */
395
396 /*
397 * Rest of packet:
398 * numrps entries of the form:
399 * 32 bits: RP
400 * 6 bits: reserved
401 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
402 * 8 bits: # of entries for this RP
403 * each entry: 7 bits: reserved, 1 bit: negative,
404 * 8 bits: mask 32 bits: source
405 * lather, rinse, repeat.
406 */
407 while (numrps != 0) {
408 u_int nentries;
409 char s;
410
411 if (len < 4)
412 goto trunc;
413 ND_TCHECK_4(bp);
414 ND_PRINT(" RP %s", GET_IPADDR_STRING(bp));
415 bp += 4;
416 len -= 4;
417 if (len < 1)
418 goto trunc;
419 switch (GET_U_1(bp) & 0x3) {
420 case 0: ND_PRINT(" PIMv?");
421 break;
422 case 1: ND_PRINT(" PIMv1");
423 break;
424 case 2: ND_PRINT(" PIMv2");
425 break;
426 case 3: ND_PRINT(" PIMv1+2");
427 break;
428 }
429 if (GET_U_1(bp) & 0xfc)
430 ND_PRINT(" [rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
431 bp += 1;
432 len -= 1;
433 if (len < 1)
434 goto trunc;
435 nentries = GET_U_1(bp);
436 bp += 1;
437 len -= 1;
438 s = ' ';
439 while (nentries != 0) {
440 if (len < 6)
441 goto trunc;
442 ND_PRINT("%c%s%s/%u", s, GET_U_1(bp) & 1 ? "!" : "",
443 GET_IPADDR_STRING(bp + 2), GET_U_1(bp + 1));
444 if (GET_U_1(bp) & 0x02) {
445 ND_PRINT(" bidir");
446 }
447 if (GET_U_1(bp) & 0xfc) {
448 ND_PRINT("[rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
449 }
450 s = ',';
451 bp += 6; len -= 6;
452 nentries--;
453 }
454 numrps--;
455 }
456 return;
457
458 trunc:
459 nd_print_trunc(ndo);
460 return;
461 }
462
463 void
464 pim_print(netdissect_options *ndo,
465 const u_char *bp, u_int len, const u_char *bp2)
466 {
467 const struct pim *pim = (const struct pim *)bp;
468 uint8_t pim_typever;
469
470 ndo->ndo_protocol = "pim";
471 #ifdef notyet /* currently we see only version and type */
472 ND_TCHECK_1(pim->pim_rsv);
473 #endif
474
475 pim_typever = GET_U_1(pim->pim_typever);
476 switch (PIM_VER(pim_typever)) {
477 case 2:
478 if (!ndo->ndo_vflag) {
479 ND_PRINT("PIMv%u, %s, length %u",
480 PIM_VER(pim_typever),
481 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)),
482 len);
483 return;
484 } else {
485 ND_PRINT("PIMv%u, length %u\n\t%s",
486 PIM_VER(pim_typever),
487 len,
488 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)));
489 pimv2_print(ndo, bp, len, bp2);
490 }
491 break;
492 default:
493 ND_PRINT("PIMv%u, length %u",
494 PIM_VER(pim_typever),
495 len);
496 break;
497 }
498 }
499
500 /*
501 * PIMv2 uses encoded address representations.
502 *
503 * The last PIM-SM I-D before RFC2117 was published specified the
504 * following representation for unicast addresses. However, RFC2117
505 * specified no encoding for unicast addresses with the unicast
506 * address length specified in the header. Therefore, we have to
507 * guess which encoding is being used (Cisco's PIMv2 implementation
508 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
509 * field into a 'unicast-address-length-in-bytes' field. We guess
510 * that it's the draft encoding if this reserved field is zero.
511 *
512 * RFC2362 goes back to the encoded format, and calls the addr length
513 * field "reserved" again.
514 *
515 * The first byte is the address family, from:
516 *
517 * 0 Reserved
518 * 1 IP (IP version 4)
519 * 2 IP6 (IP version 6)
520 * 3 NSAP
521 * 4 HDLC (8-bit multidrop)
522 * 5 BBN 1822
523 * 6 802 (includes all 802 media plus Ethernet "canonical format")
524 * 7 E.163
525 * 8 E.164 (SMDS, Frame Relay, ATM)
526 * 9 F.69 (Telex)
527 * 10 X.121 (X.25, Frame Relay)
528 * 11 IPX
529 * 12 Appletalk
530 * 13 Decnet IV
531 * 14 Banyan Vines
532 * 15 E.164 with NSAP format subaddress
533 *
534 * In addition, the second byte is an "Encoding". 0 is the default
535 * encoding for the address family, and no other encodings are currently
536 * specified.
537 *
538 */
539
540 enum pimv2_addrtype {
541 pimv2_unicast, pimv2_group, pimv2_source
542 };
543
544 /* 0 1 2 3
545 * 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
546 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
547 * | Addr Family | Encoding Type | Unicast Address |
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 | Reserved | Mask Len |
553 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
554 * | Group multicast Address |
555 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
556 * 0 1 2 3
557 * 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
558 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
559 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
560 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
561 * | Source Address |
562 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
563 */
564 static int
565 pimv2_addr_print(netdissect_options *ndo,
566 const u_char *bp, u_int len, enum pimv2_addrtype at,
567 u_int addr_len, int silent)
568 {
569 u_int af;
570 int hdrlen;
571
572 if (addr_len == 0) {
573 if (len < 2)
574 goto trunc;
575 switch (GET_U_1(bp)) {
576 case 1:
577 af = AF_INET;
578 addr_len = (u_int)sizeof(nd_ipv4);
579 break;
580 case 2:
581 af = AF_INET6;
582 addr_len = (u_int)sizeof(nd_ipv6);
583 break;
584 default:
585 return -1;
586 }
587 if (GET_U_1(bp + 1) != 0)
588 return -1;
589 hdrlen = 2;
590 } else {
591 switch (addr_len) {
592 case sizeof(nd_ipv4):
593 af = AF_INET;
594 break;
595 case sizeof(nd_ipv6):
596 af = AF_INET6;
597 break;
598 default:
599 return -1;
600 break;
601 }
602 hdrlen = 0;
603 }
604
605 bp += hdrlen;
606 len -= hdrlen;
607 switch (at) {
608 case pimv2_unicast:
609 if (len < addr_len)
610 goto trunc;
611 ND_TCHECK_LEN(bp, addr_len);
612 if (af == AF_INET) {
613 if (!silent)
614 ND_PRINT("%s", GET_IPADDR_STRING(bp));
615 }
616 else if (af == AF_INET6) {
617 if (!silent)
618 ND_PRINT("%s", GET_IP6ADDR_STRING(bp));
619 }
620 return hdrlen + addr_len;
621 case pimv2_group:
622 case pimv2_source:
623 if (len < addr_len + 2)
624 goto trunc;
625 ND_TCHECK_LEN(bp, addr_len + 2);
626 if (af == AF_INET) {
627 if (!silent) {
628 ND_PRINT("%s", GET_IPADDR_STRING(bp + 2));
629 if (GET_U_1(bp + 1) != 32)
630 ND_PRINT("/%u", GET_U_1(bp + 1));
631 }
632 }
633 else if (af == AF_INET6) {
634 if (!silent) {
635 ND_PRINT("%s", GET_IP6ADDR_STRING(bp + 2));
636 if (GET_U_1(bp + 1) != 128)
637 ND_PRINT("/%u", GET_U_1(bp + 1));
638 }
639 }
640 if (GET_U_1(bp) && !silent) {
641 if (at == pimv2_group) {
642 ND_PRINT("(0x%02x)", GET_U_1(bp));
643 } else {
644 ND_PRINT("(%s%s%s",
645 GET_U_1(bp) & 0x04 ? "S" : "",
646 GET_U_1(bp) & 0x02 ? "W" : "",
647 GET_U_1(bp) & 0x01 ? "R" : "");
648 if (GET_U_1(bp) & 0xf8) {
649 ND_PRINT("+0x%02x",
650 GET_U_1(bp) & 0xf8);
651 }
652 ND_PRINT(")");
653 }
654 }
655 return hdrlen + 2 + addr_len;
656 default:
657 return -1;
658 }
659 trunc:
660 return -1;
661 }
662
663 enum checksum_status {
664 CORRECT,
665 INCORRECT,
666 UNVERIFIED
667 };
668
669 static enum checksum_status
670 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
671 const u_char *bp2, u_int len)
672 {
673 const struct ip *ip;
674 u_int cksum;
675
676 if (!ND_TTEST_LEN(bp, len)) {
677 /* We don't have all the data. */
678 return (UNVERIFIED);
679 }
680 ip = (const struct ip *)bp2;
681 if (IP_V(ip) == 4) {
682 struct cksum_vec vec[1];
683
684 vec[0].ptr = bp;
685 vec[0].len = len;
686 cksum = in_cksum(vec, 1);
687 return (cksum ? INCORRECT : CORRECT);
688 } else if (IP_V(ip) == 6) {
689 const struct ip6_hdr *ip6;
690
691 ip6 = (const struct ip6_hdr *)bp2;
692 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
693 return (cksum ? INCORRECT : CORRECT);
694 } else {
695 return (UNVERIFIED);
696 }
697 }
698
699 static void
700 pimv2_print(netdissect_options *ndo,
701 const u_char *bp, u_int len, const u_char *bp2)
702 {
703 const struct pim *pim = (const struct pim *)bp;
704 int advance;
705 int subtype;
706 enum checksum_status cksum_status;
707 u_int pim_typever;
708 u_int pimv2_addr_len;
709
710 ndo->ndo_protocol = "pimv2";
711 if (len < 2) {
712 ND_PRINT("[length %u < 2]", len);
713 nd_print_invalid(ndo);
714 return;
715 }
716 pim_typever = GET_U_1(pim->pim_typever);
717 /* RFC5015 allocates the high 4 bits of pim_rsv for "subtype". */
718 pimv2_addr_len = GET_U_1(pim->pim_rsv) & 0x0f;
719 if (pimv2_addr_len != 0)
720 ND_PRINT(", RFC2117-encoding");
721
722 if (len < 4) {
723 ND_PRINT("[length %u < 4]", len);
724 nd_print_invalid(ndo);
725 return;
726 }
727 ND_PRINT(", cksum 0x%04x ", GET_BE_U_2(pim->pim_cksum));
728 if (GET_BE_U_2(pim->pim_cksum) == 0) {
729 ND_PRINT("(unverified)");
730 } else {
731 if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) {
732 /*
733 * The checksum only covers the packet header,
734 * not the encapsulated packet.
735 */
736 cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
737 if (cksum_status == INCORRECT) {
738 /*
739 * To quote RFC 4601, "For interoperability
740 * reasons, a message carrying a checksum
741 * calculated over the entire PIM Register
742 * message should also be accepted."
743 */
744 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
745 }
746 } else {
747 /*
748 * The checksum covers the entire packet.
749 */
750 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
751 }
752 switch (cksum_status) {
753
754 case CORRECT:
755 ND_PRINT("(correct)");
756 break;
757
758 case INCORRECT:
759 ND_PRINT("(incorrect)");
760 break;
761
762 case UNVERIFIED:
763 ND_PRINT("(unverified)");
764 break;
765 }
766 }
767 bp += 4;
768 len -= 4;
769
770 switch (PIM_TYPE(pim_typever)) {
771 case PIMV2_TYPE_HELLO:
772 {
773 uint16_t otype, olen;
774 while (len > 0) {
775 if (len < 4)
776 goto trunc;
777 otype = GET_BE_U_2(bp);
778 olen = GET_BE_U_2(bp + 2);
779 ND_PRINT("\n\t %s Option (%u), length %u, Value: ",
780 tok2str(pimv2_hello_option_values, "Unknown", otype),
781 otype,
782 olen);
783 bp += 4;
784 len -= 4;
785
786 if (len < olen)
787 goto trunc;
788 ND_TCHECK_LEN(bp, olen);
789 switch (otype) {
790 case PIMV2_HELLO_OPTION_HOLDTIME:
791 if (olen != 2) {
792 ND_PRINT("[option length %u != 2]", olen);
793 nd_print_invalid(ndo);
794 return;
795 } else {
796 unsigned_relts_print(ndo,
797 GET_BE_U_2(bp));
798 }
799 break;
800
801 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
802 if (olen != 4) {
803 ND_PRINT("[option length %u != 4]", olen);
804 nd_print_invalid(ndo);
805 return;
806 } else {
807 char t_bit;
808 uint16_t lan_delay, override_interval;
809 lan_delay = GET_BE_U_2(bp);
810 override_interval = GET_BE_U_2(bp + 2);
811 t_bit = (lan_delay & 0x8000)? 1 : 0;
812 lan_delay &= ~0x8000;
813 ND_PRINT("\n\t T-bit=%u, LAN delay %ums, Override interval %ums",
814 t_bit, lan_delay, override_interval);
815 }
816 break;
817
818 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
819 case PIMV2_HELLO_OPTION_DR_PRIORITY:
820 switch (olen) {
821 case 0:
822 ND_PRINT("Bi-Directional Capability (Old)");
823 break;
824 case 4:
825 ND_PRINT("%u", GET_BE_U_4(bp));
826 break;
827 default:
828 ND_PRINT("[option length %u != 4]", olen);
829 nd_print_invalid(ndo);
830 return;
831 break;
832 }
833 break;
834
835 case PIMV2_HELLO_OPTION_GENID:
836 if (olen != 4) {
837 ND_PRINT("[option length %u != 4]", olen);
838 nd_print_invalid(ndo);
839 return;
840 } else {
841 ND_PRINT("0x%08x", GET_BE_U_4(bp));
842 }
843 break;
844
845 case PIMV2_HELLO_OPTION_REFRESH_CAP:
846 if (olen != 4) {
847 ND_PRINT("[option length %u != 4]", olen);
848 nd_print_invalid(ndo);
849 return;
850 } else {
851 ND_PRINT("v%u", GET_U_1(bp));
852 if (GET_U_1(bp + 1) != 0) {
853 ND_PRINT(", interval ");
854 unsigned_relts_print(ndo,
855 GET_U_1(bp + 1));
856 }
857 if (GET_BE_U_2(bp + 2) != 0) {
858 ND_PRINT(" ?0x%04x?",
859 GET_BE_U_2(bp + 2));
860 }
861 }
862 break;
863
864 case PIMV2_HELLO_OPTION_BIDIR_CAP:
865 break;
866
867 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
868 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
869 if (ndo->ndo_vflag > 1) {
870 const u_char *ptr = bp;
871 u_int plen = len;
872 while (ptr < (bp+olen)) {
873 ND_PRINT("\n\t ");
874 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
875 if (advance < 0)
876 goto trunc;
877 ptr += advance;
878 plen -= advance;
879 }
880 }
881 break;
882 default:
883 if (ndo->ndo_vflag <= 1)
884 print_unknown_data(ndo, bp, "\n\t ", olen);
885 break;
886 }
887 /* do we want to see an additionally hexdump ? */
888 if (ndo->ndo_vflag> 1)
889 print_unknown_data(ndo, bp, "\n\t ", olen);
890 bp += olen;
891 len -= olen;
892 }
893 break;
894 }
895
896 case PIMV2_TYPE_REGISTER:
897 {
898 const struct ip *ip;
899
900 if (len < 4)
901 goto trunc;
902 ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN);
903
904 ND_PRINT(", Flags [ %s ]\n\t",
905 tok2str(pimv2_register_flag_values,
906 "none",
907 GET_BE_U_4(bp)));
908
909 bp += 4; len -= 4;
910 /* encapsulated multicast packet */
911 if (len == 0)
912 goto trunc;
913 ip = (const struct ip *)bp;
914 switch (IP_V(ip)) {
915 case 0: /* Null header */
916 ND_TCHECK_4(ip->ip_dst);
917 ND_PRINT("IP-Null-header %s > %s",
918 GET_IPADDR_STRING(ip->ip_src),
919 GET_IPADDR_STRING(ip->ip_dst));
920 break;
921
922 case 4: /* IPv4 */
923 ip_print(ndo, bp, len);
924 break;
925
926 case 6: /* IPv6 */
927 ip6_print(ndo, bp, len);
928 break;
929
930 default:
931 ND_PRINT("IP ver %u", IP_V(ip));
932 break;
933 }
934 break;
935 }
936
937 case PIMV2_TYPE_REGISTER_STOP:
938 ND_PRINT(" group=");
939 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
940 goto trunc;
941 bp += advance; len -= advance;
942 ND_PRINT(" source=");
943 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
944 goto trunc;
945 bp += advance; len -= advance;
946 break;
947
948 case PIMV2_TYPE_JOIN_PRUNE:
949 case PIMV2_TYPE_GRAFT:
950 case PIMV2_TYPE_GRAFT_ACK:
951
952
953 /*
954 * 0 1 2 3
955 * 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
956 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
957 * |PIM Ver| Type | Addr length | Checksum |
958 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
959 * | Unicast-Upstream Neighbor Address |
960 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
961 * | Reserved | Num groups | Holdtime |
962 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
963 * | Encoded-Multicast Group Address-1 |
964 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
965 * | Number of Joined Sources | Number of Pruned Sources |
966 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
967 * | Encoded-Joined Source Address-1 |
968 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
969 * | . |
970 * | . |
971 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
972 * | Encoded-Joined Source Address-n |
973 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
974 * | Encoded-Pruned Source Address-1 |
975 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
976 * | . |
977 * | . |
978 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
979 * | Encoded-Pruned Source Address-n |
980 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
981 * | . |
982 * | . |
983 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
984 * | Encoded-Multicast Group Address-n |
985 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
986 */
987
988 {
989 uint8_t ngroup;
990 uint16_t holdtime;
991 uint16_t njoin;
992 uint16_t nprune;
993 u_int i, j;
994
995 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
996 ND_PRINT(", upstream-neighbor: ");
997 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
998 goto trunc;
999 bp += advance; len -= advance;
1000 }
1001 if (len < 4)
1002 goto trunc;
1003 ND_TCHECK_4(bp);
1004 ngroup = GET_U_1(bp + 1);
1005 holdtime = GET_BE_U_2(bp + 2);
1006 ND_PRINT("\n\t %u group(s)", ngroup);
1007 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
1008 ND_PRINT(", holdtime: ");
1009 if (holdtime == 0xffff)
1010 ND_PRINT("infinite");
1011 else
1012 unsigned_relts_print(ndo, holdtime);
1013 }
1014 bp += 4; len -= 4;
1015 for (i = 0; i < ngroup; i++) {
1016 ND_PRINT("\n\t group #%u: ", i+1);
1017 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1018 goto trunc;
1019 bp += advance; len -= advance;
1020 if (len < 4)
1021 goto trunc;
1022 ND_TCHECK_4(bp);
1023 njoin = GET_BE_U_2(bp);
1024 nprune = GET_BE_U_2(bp + 2);
1025 ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune);
1026 bp += 4; len -= 4;
1027 for (j = 0; j < njoin; j++) {
1028 ND_PRINT("\n\t joined source #%u: ", j+1);
1029 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1030 goto trunc;
1031 bp += advance; len -= advance;
1032 }
1033 for (j = 0; j < nprune; j++) {
1034 ND_PRINT("\n\t pruned source #%u: ", j+1);
1035 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1036 goto trunc;
1037 bp += advance; len -= advance;
1038 }
1039 }
1040 break;
1041 }
1042
1043 case PIMV2_TYPE_BOOTSTRAP:
1044 {
1045 u_int i, j, frpcnt;
1046
1047 /* Fragment Tag, Hash Mask len, and BSR-priority */
1048 if (len < 2)
1049 goto trunc;
1050 ND_PRINT(" tag=%x", GET_BE_U_2(bp));
1051 bp += 2;
1052 len -= 2;
1053 if (len < 1)
1054 goto trunc;
1055 ND_PRINT(" hashmlen=%u", GET_U_1(bp));
1056 if (len < 2)
1057 goto trunc;
1058 ND_TCHECK_1(bp + 2);
1059 ND_PRINT(" BSRprio=%u", GET_U_1(bp + 1));
1060 bp += 2;
1061 len -= 2;
1062
1063 /* Encoded-Unicast-BSR-Address */
1064 ND_PRINT(" BSR=");
1065 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1066 goto trunc;
1067 bp += advance;
1068 len -= advance;
1069
1070 for (i = 0; len > 0; i++) {
1071 /* Encoded-Group Address */
1072 ND_PRINT(" (group%u: ", i);
1073 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1074 goto trunc;
1075 bp += advance;
1076 len -= advance;
1077
1078 /* RP-Count, Frag RP-Cnt, and rsvd */
1079 if (len < 1)
1080 goto trunc;
1081 ND_PRINT(" RPcnt=%u", GET_U_1(bp));
1082 if (len < 2)
1083 goto trunc;
1084 frpcnt = GET_U_1(bp + 1);
1085 ND_PRINT(" FRPcnt=%u", frpcnt);
1086 if (len < 4)
1087 goto trunc;
1088 bp += 4;
1089 len -= 4;
1090
1091 for (j = 0; j < frpcnt && len > 0; j++) {
1092 /* each RP info */
1093 ND_PRINT(" RP%u=", j);
1094 if ((advance = pimv2_addr_print(ndo, bp, len,
1095 pimv2_unicast,
1096 pimv2_addr_len,
1097 0)) < 0)
1098 goto trunc;
1099 bp += advance;
1100 len -= advance;
1101
1102 if (len < 2)
1103 goto trunc;
1104 ND_TCHECK_2(bp);
1105 ND_PRINT(",holdtime=");
1106 unsigned_relts_print(ndo,
1107 GET_BE_U_2(bp));
1108 if (len < 3)
1109 goto trunc;
1110 ND_PRINT(",prio=%u", GET_U_1(bp + 2));
1111 if (len < 4)
1112 goto trunc;
1113 bp += 4;
1114 len -= 4;
1115 }
1116 ND_PRINT(")");
1117 }
1118 break;
1119 }
1120 case PIMV2_TYPE_ASSERT:
1121 ND_PRINT(" group=");
1122 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1123 goto trunc;
1124 bp += advance; len -= advance;
1125 ND_PRINT(" src=");
1126 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1127 goto trunc;
1128 bp += advance; len -= advance;
1129 if (len < 8)
1130 goto trunc;
1131 ND_TCHECK_8(bp);
1132 if (GET_U_1(bp) & 0x80)
1133 ND_PRINT(" RPT");
1134 ND_PRINT(" pref=%u", GET_BE_U_4(bp) & 0x7fffffff);
1135 ND_PRINT(" metric=%u", GET_BE_U_4(bp + 4));
1136 break;
1137
1138 case PIMV2_TYPE_CANDIDATE_RP:
1139 {
1140 u_int i, pfxcnt;
1141
1142 /* Prefix-Cnt, Priority, and Holdtime */
1143 if (len < 1)
1144 goto trunc;
1145 ND_PRINT(" prefix-cnt=%u", GET_U_1(bp));
1146 pfxcnt = GET_U_1(bp);
1147 if (len < 2)
1148 goto trunc;
1149 ND_PRINT(" prio=%u", GET_U_1(bp + 1));
1150 if (len < 4)
1151 goto trunc;
1152 ND_PRINT(" holdtime=");
1153 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
1154 bp += 4;
1155 len -= 4;
1156
1157 /* Encoded-Unicast-RP-Address */
1158 ND_PRINT(" RP=");
1159 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1160 goto trunc;
1161 bp += advance;
1162 len -= advance;
1163
1164 /* Encoded-Group Addresses */
1165 for (i = 0; i < pfxcnt && len > 0; i++) {
1166 ND_PRINT(" Group%u=", i);
1167 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1168 goto trunc;
1169 bp += advance;
1170 len -= advance;
1171 }
1172 break;
1173 }
1174
1175 case PIMV2_TYPE_PRUNE_REFRESH:
1176 ND_PRINT(" src=");
1177 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1178 goto trunc;
1179 bp += advance;
1180 len -= advance;
1181 ND_PRINT(" grp=");
1182 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1183 goto trunc;
1184 bp += advance;
1185 len -= advance;
1186 ND_PRINT(" forwarder=");
1187 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1188 goto trunc;
1189 bp += advance;
1190 len -= advance;
1191 if (len < 2)
1192 goto trunc;
1193 ND_PRINT(" TUNR ");
1194 unsigned_relts_print(ndo, GET_BE_U_2(bp));
1195 break;
1196
1197 case PIMV2_TYPE_DF_ELECTION:
1198 subtype = PIM_SUBTYPE(GET_U_1(pim->pim_rsv));
1199 ND_PRINT("\n\t %s,", tok2str( pimv2_df_election_flag_values,
1200 "Unknown", subtype) );
1201
1202 ND_PRINT(" rpa=");
1203 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1204 goto trunc;
1205 }
1206 bp += advance;
1207 len -= advance;
1208 ND_PRINT(" sender pref=%u", GET_BE_U_4(bp) );
1209 ND_PRINT(" sender metric=%u", GET_BE_U_4(bp + 4));
1210
1211 bp += 8;
1212 len -= 8;
1213
1214 switch (subtype) {
1215 case PIMV2_DF_ELECTION_BACKOFF:
1216 case PIMV2_DF_ELECTION_PASS:
1217 ND_PRINT("\n\t %s addr=", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype));
1218 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1219 goto trunc;
1220 }
1221 bp += advance;
1222 len -= advance;
1223
1224 ND_PRINT(" %s pref=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp) );
1225 ND_PRINT(" %s metric=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp + 4));
1226
1227 bp += 8;
1228 len -= 8;
1229
1230 if (subtype == PIMV2_DF_ELECTION_BACKOFF) {
1231 ND_PRINT(" interval %dms", GET_BE_U_2(bp));
1232 }
1233
1234 break;
1235 default:
1236 break;
1237 }
1238 break;
1239
1240 default:
1241 ND_PRINT(" [type %u]", PIM_TYPE(pim_typever));
1242 break;
1243 }
1244
1245 return;
1246
1247 trunc:
1248 nd_print_trunc(ndo);
1249 }
[mirror] the TCPdump network dissector