]> The Tcpdump Group git mirrors - tcpdump/blob - print-pim.c
projects / tcpdump / blob
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
Address various E_STATEMENT_NOT_REACHED from Sun C.
[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 #include "af.h"
38
39 #define PIMV1_TYPE_QUERY 0
40 #define PIMV1_TYPE_REGISTER 1
41 #define PIMV1_TYPE_REGISTER_STOP 2
42 #define PIMV1_TYPE_JOIN_PRUNE 3
43 #define PIMV1_TYPE_RP_REACHABILITY 4
44 #define PIMV1_TYPE_ASSERT 5
45 #define PIMV1_TYPE_GRAFT 6
46 #define PIMV1_TYPE_GRAFT_ACK 7
47
48 static const struct tok pimv1_type_str[] = {
49 { PIMV1_TYPE_QUERY, "Query" },
50 { PIMV1_TYPE_REGISTER, "Register" },
51 { PIMV1_TYPE_REGISTER_STOP, "Register-Stop" },
52 { PIMV1_TYPE_JOIN_PRUNE, "Join/Prune" },
53 { PIMV1_TYPE_RP_REACHABILITY, "RP-reachable" },
54 { PIMV1_TYPE_ASSERT, "Assert" },
55 { PIMV1_TYPE_GRAFT, "Graft" },
56 { PIMV1_TYPE_GRAFT_ACK, "Graft-ACK" },
57 { 0, NULL }
58 };
59
60 #define PIMV2_TYPE_HELLO 0
61 #define PIMV2_TYPE_REGISTER 1
62 #define PIMV2_TYPE_REGISTER_STOP 2
63 #define PIMV2_TYPE_JOIN_PRUNE 3
64 #define PIMV2_TYPE_BOOTSTRAP 4
65 #define PIMV2_TYPE_ASSERT 5
66 #define PIMV2_TYPE_GRAFT 6
67 #define PIMV2_TYPE_GRAFT_ACK 7
68 #define PIMV2_TYPE_CANDIDATE_RP 8
69 #define PIMV2_TYPE_PRUNE_REFRESH 9
70 #define PIMV2_TYPE_DF_ELECTION 10
71 #define PIMV2_TYPE_ECMP_REDIRECT 11
72
73 static const struct tok pimv2_type_values[] = {
74 { PIMV2_TYPE_HELLO, "Hello" },
75 { PIMV2_TYPE_REGISTER, "Register" },
76 { PIMV2_TYPE_REGISTER_STOP, "Register Stop" },
77 { PIMV2_TYPE_JOIN_PRUNE, "Join / Prune" },
78 { PIMV2_TYPE_BOOTSTRAP, "Bootstrap" },
79 { PIMV2_TYPE_ASSERT, "Assert" },
80 { PIMV2_TYPE_GRAFT, "Graft" },
81 { PIMV2_TYPE_GRAFT_ACK, "Graft Acknowledgement" },
82 { PIMV2_TYPE_CANDIDATE_RP, "Candidate RP Advertisement" },
83 { PIMV2_TYPE_PRUNE_REFRESH, "Prune Refresh" },
84 { PIMV2_TYPE_DF_ELECTION, "DF Election" },
85 { PIMV2_TYPE_ECMP_REDIRECT, "ECMP Redirect" },
86 { 0, NULL}
87 };
88
89 #define PIMV2_HELLO_OPTION_HOLDTIME 1
90 #define PIMV2_HELLO_OPTION_LANPRUNEDELAY 2
91 #define PIMV2_HELLO_OPTION_DR_PRIORITY_OLD 18
92 #define PIMV2_HELLO_OPTION_DR_PRIORITY 19
93 #define PIMV2_HELLO_OPTION_GENID 20
94 #define PIMV2_HELLO_OPTION_REFRESH_CAP 21
95 #define PIMV2_HELLO_OPTION_BIDIR_CAP 22
96 #define PIMV2_HELLO_OPTION_ADDRESS_LIST 24
97 #define PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD 65001
98
99 static const struct tok pimv2_hello_option_values[] = {
100 { PIMV2_HELLO_OPTION_HOLDTIME, "Hold Time" },
101 { PIMV2_HELLO_OPTION_LANPRUNEDELAY, "LAN Prune Delay" },
102 { PIMV2_HELLO_OPTION_DR_PRIORITY_OLD, "DR Priority (Old)" },
103 { PIMV2_HELLO_OPTION_DR_PRIORITY, "DR Priority" },
104 { PIMV2_HELLO_OPTION_GENID, "Generation ID" },
105 { PIMV2_HELLO_OPTION_REFRESH_CAP, "State Refresh Capability" },
106 { PIMV2_HELLO_OPTION_BIDIR_CAP, "Bi-Directional Capability" },
107 { PIMV2_HELLO_OPTION_ADDRESS_LIST, "Address List" },
108 { PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD, "Address List (Old)" },
109 { 0, NULL}
110 };
111
112 #define PIMV2_REGISTER_FLAG_LEN 4
113 #define PIMV2_REGISTER_FLAG_BORDER 0x80000000
114 #define PIMV2_REGISTER_FLAG_NULL 0x40000000
115
116 static const struct tok pimv2_register_flag_values[] = {
117 { PIMV2_REGISTER_FLAG_BORDER, "Border" },
118 { PIMV2_REGISTER_FLAG_NULL, "Null" },
119 { 0, NULL}
120 };
121
122 #define PIMV2_DF_ELECTION_OFFER 1
123 #define PIMV2_DF_ELECTION_WINNER 2
124 #define PIMV2_DF_ELECTION_BACKOFF 3
125 #define PIMV2_DF_ELECTION_PASS 4
126
127 static const struct tok pimv2_df_election_flag_values[] = {
128 { PIMV2_DF_ELECTION_OFFER, "Offer" },
129 { PIMV2_DF_ELECTION_WINNER, "Winner" },
130 { PIMV2_DF_ELECTION_BACKOFF, "Backoff" },
131 { PIMV2_DF_ELECTION_PASS, "Pass" },
132 { 0, NULL}
133 };
134
135 #define PIMV2_DF_ELECTION_PASS_BACKOFF_STR(x) ( \
136 x == PIMV2_DF_ELECTION_BACKOFF ? "offer" : "new winner" )
137
138
139 /*
140 * XXX: We consider a case where IPv6 is not ready yet for portability,
141 * but PIM dependent definitions should be independent of IPv6...
142 */
143
144 struct pim {
145 nd_uint8_t pim_typever;
146 /* upper 4bit: PIM version number; 2 for PIMv2 */
147 /* lower 4bit: the PIM message type, currently they are:
148 * Hello, Register, Register-Stop, Join/Prune,
149 * Bootstrap, Assert, Graft (PIM-DM only),
150 * Graft-Ack (PIM-DM only), C-RP-Adv
151 */
152 #define PIM_VER(x) (((x) & 0xf0) >> 4)
153 #define PIM_TYPE(x) ((x) & 0x0f)
154 nd_uint8_t pim_rsv; /* Reserved in v1, subtype+address length in v2 */
155 #define PIM_SUBTYPE(x) (((x) & 0xf0) >> 4)
156 nd_uint16_t pim_cksum; /* IP style check sum */
157 };
158
159 static void pimv2_print(netdissect_options *, const u_char *bp, u_int len, const u_char *);
160
161 static void
162 pimv1_join_prune_print(netdissect_options *ndo,
163 const u_char *bp, u_int len)
164 {
165 u_int ngroups, njoin, nprune;
166 u_int njp;
167
168 /* If it's a single group and a single source, use 1-line output. */
169 if (ND_TTEST_LEN(bp, 30) && GET_U_1(bp + 11) == 1 &&
170 ((njoin = GET_BE_U_2(bp + 20)) + GET_BE_U_2(bp + 22)) == 1) {
171 u_int hold;
172
173 ND_PRINT(" RPF %s ", GET_IPADDR_STRING(bp));
174 hold = GET_BE_U_2(bp + 6);
175 if (hold != 180) {
176 ND_PRINT("Hold ");
177 unsigned_relts_print(ndo, hold);
178 }
179 ND_PRINT("%s (%s/%u, %s", njoin ? "Join" : "Prune",
180 GET_IPADDR_STRING(bp + 26), GET_U_1(bp + 25) & 0x3f,
181 GET_IPADDR_STRING(bp + 12));
182 if (GET_BE_U_4(bp + 16) != 0xffffffff)
183 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 16));
184 ND_PRINT(") %s%s %s",
185 (GET_U_1(bp + 24) & 0x01) ? "Sparse" : "Dense",
186 (GET_U_1(bp + 25) & 0x80) ? " WC" : "",
187 (GET_U_1(bp + 25) & 0x40) ? "RP" : "SPT");
188 return;
189 }
190
191 if (len < sizeof(nd_ipv4))
192 goto trunc;
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_PRINT("\n\tGroup: %s", GET_IPADDR_STRING(bp));
222 bp += 4;
223 len -= 4;
224 if (len < 4)
225 goto trunc;
226 if (GET_BE_U_4(bp) != 0xffffffff)
227 ND_PRINT("/%s", GET_IPADDR_STRING(bp));
228 bp += 4;
229 len -= 4;
230 if (len < 4)
231 goto trunc;
232 njoin = GET_BE_U_2(bp);
233 nprune = GET_BE_U_2(bp + 2);
234 ND_PRINT(" joined: %u pruned: %u", njoin, nprune);
235 bp += 4;
236 len -= 4;
237 for (njp = 0; njp < (njoin + nprune); njp++) {
238 const char *type;
239
240 if (njp < njoin)
241 type = "Join ";
242 else
243 type = "Prune";
244 if (len < 6)
245 goto trunc;
246 ND_PRINT("\n\t%s %s%s%s%s/%u", type,
247 (GET_U_1(bp) & 0x01) ? "Sparse " : "Dense ",
248 (GET_U_1(bp + 1) & 0x80) ? "WC " : "",
249 (GET_U_1(bp + 1) & 0x40) ? "RP " : "SPT ",
250 GET_IPADDR_STRING(bp + 2),
251 GET_U_1(bp + 1) & 0x3f);
252 bp += 6;
253 len -= 6;
254 }
255 ngroups--;
256 }
257 return;
258 trunc:
259 nd_print_trunc(ndo);
260 }
261
262 void
263 pimv1_print(netdissect_options *ndo,
264 const u_char *bp, u_int len)
265 {
266 u_char type;
267
268 ndo->ndo_protocol = "pimv1";
269 type = GET_U_1(bp + 1);
270
271 ND_PRINT(" %s", tok2str(pimv1_type_str, "[type %u]", type));
272 switch (type) {
273 case PIMV1_TYPE_QUERY:
274 if (ND_TTEST_1(bp + 8)) {
275 switch (GET_U_1(bp + 8) >> 4) {
276 case 0:
277 ND_PRINT(" Dense-mode");
278 break;
279 case 1:
280 ND_PRINT(" Sparse-mode");
281 break;
282 case 2:
283 ND_PRINT(" Sparse-Dense-mode");
284 break;
285 default:
286 ND_PRINT(" mode-%u", GET_U_1(bp + 8) >> 4);
287 break;
288 }
289 }
290 if (ndo->ndo_vflag) {
291 ND_PRINT(" (Hold-time ");
292 unsigned_relts_print(ndo, GET_BE_U_2(bp + 10));
293 ND_PRINT(")");
294 }
295 break;
296
297 case PIMV1_TYPE_REGISTER:
298 ND_TCHECK_LEN(bp + 8, 20); /* ip header */
299 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 20),
300 GET_IPADDR_STRING(bp + 24));
301 break;
302 case PIMV1_TYPE_REGISTER_STOP:
303 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 8),
304 GET_IPADDR_STRING(bp + 12));
305 break;
306 case PIMV1_TYPE_RP_REACHABILITY:
307 if (ndo->ndo_vflag) {
308 ND_PRINT(" group %s", GET_IPADDR_STRING(bp + 8));
309 if (GET_BE_U_4(bp + 12) != 0xffffffff)
310 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
311 ND_PRINT(" RP %s hold ", GET_IPADDR_STRING(bp + 16));
312 unsigned_relts_print(ndo, GET_BE_U_2(bp + 22));
313 }
314 break;
315 case PIMV1_TYPE_ASSERT:
316 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 16),
317 GET_IPADDR_STRING(bp + 8));
318 if (GET_BE_U_4(bp + 12) != 0xffffffff)
319 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
320 ND_PRINT(" %s pref %u metric %u",
321 (GET_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT",
322 GET_BE_U_4(bp + 20) & 0x7fffffff,
323 GET_BE_U_4(bp + 24));
324 break;
325 case PIMV1_TYPE_JOIN_PRUNE:
326 case PIMV1_TYPE_GRAFT:
327 case PIMV1_TYPE_GRAFT_ACK:
328 if (ndo->ndo_vflag) {
329 if (len < 8)
330 goto trunc;
331 pimv1_join_prune_print(ndo, bp + 8, len - 8);
332 }
333 break;
334 }
335 if ((GET_U_1(bp + 4) >> 4) != 1)
336 ND_PRINT(" [v%u]", GET_U_1(bp + 4) >> 4);
337 return;
338
339 trunc:
340 nd_print_trunc(ndo);
341 }
342
343 /*
344 * auto-RP is a cisco protocol, documented at
345 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
346 *
347 * This implements version 1+, dated Sept 9, 1998.
348 */
349 void
350 cisco_autorp_print(netdissect_options *ndo,
351 const u_char *bp, u_int len)
352 {
353 u_int type;
354 u_int numrps;
355 u_int hold;
356
357 ndo->ndo_protocol = "cisco_autorp";
358 if (len < 8)
359 goto trunc;
360 ND_PRINT(" auto-rp ");
361 type = GET_U_1(bp);
362 switch (type) {
363 case 0x11:
364 ND_PRINT("candidate-advert");
365 break;
366 case 0x12:
367 ND_PRINT("mapping");
368 break;
369 default:
370 ND_PRINT("type-0x%02x", type);
371 break;
372 }
373
374 numrps = GET_U_1(bp + 1);
375
376 ND_PRINT(" Hold ");
377 hold = GET_BE_U_2(bp + 2);
378 if (hold)
379 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
380 else
381 ND_PRINT("FOREVER");
382
383 /* Next 4 bytes are reserved. */
384
385 bp += 8; len -= 8;
386
387 /*XXX skip unless -v? */
388
389 /*
390 * Rest of packet:
391 * numrps entries of the form:
392 * 32 bits: RP
393 * 6 bits: reserved
394 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
395 * 8 bits: # of entries for this RP
396 * each entry: 7 bits: reserved, 1 bit: negative,
397 * 8 bits: mask 32 bits: source
398 * lather, rinse, repeat.
399 */
400 while (numrps != 0) {
401 u_int nentries;
402 char s;
403
404 if (len < 4)
405 goto trunc;
406 ND_PRINT(" RP %s", GET_IPADDR_STRING(bp));
407 bp += 4;
408 len -= 4;
409 if (len < 1)
410 goto trunc;
411 switch (GET_U_1(bp) & 0x3) {
412 case 0: ND_PRINT(" PIMv?");
413 break;
414 case 1: ND_PRINT(" PIMv1");
415 break;
416 case 2: ND_PRINT(" PIMv2");
417 break;
418 case 3: ND_PRINT(" PIMv1+2");
419 break;
420 }
421 if (GET_U_1(bp) & 0xfc)
422 ND_PRINT(" [rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
423 bp += 1;
424 len -= 1;
425 if (len < 1)
426 goto trunc;
427 nentries = GET_U_1(bp);
428 bp += 1;
429 len -= 1;
430 s = ' ';
431 while (nentries != 0) {
432 if (len < 6)
433 goto trunc;
434 ND_PRINT("%c%s%s/%u", s, GET_U_1(bp) & 1 ? "!" : "",
435 GET_IPADDR_STRING(bp + 2), GET_U_1(bp + 1));
436 if (GET_U_1(bp) & 0x02) {
437 ND_PRINT(" bidir");
438 }
439 if (GET_U_1(bp) & 0xfc) {
440 ND_PRINT("[rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
441 }
442 s = ',';
443 bp += 6; len -= 6;
444 nentries--;
445 }
446 numrps--;
447 }
448 return;
449
450 trunc:
451 nd_print_trunc(ndo);
452 }
453
454 void
455 pim_print(netdissect_options *ndo,
456 const u_char *bp, u_int len, const u_char *bp2)
457 {
458 const struct pim *pim = (const struct pim *)bp;
459 uint8_t pim_typever;
460
461 ndo->ndo_protocol = "pim";
462
463 pim_typever = GET_U_1(pim->pim_typever);
464 switch (PIM_VER(pim_typever)) {
465 case 2:
466 if (!ndo->ndo_vflag) {
467 ND_PRINT("PIMv%u, %s, length %u",
468 PIM_VER(pim_typever),
469 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)),
470 len);
471 return;
472 } else {
473 ND_PRINT("PIMv%u, length %u\n\t%s",
474 PIM_VER(pim_typever),
475 len,
476 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)));
477 pimv2_print(ndo, bp, len, bp2);
478 }
479 break;
480 default:
481 ND_PRINT("PIMv%u, length %u",
482 PIM_VER(pim_typever),
483 len);
484 break;
485 }
486 }
487
488 /*
489 * PIMv2 uses encoded address representations.
490 *
491 * The last PIM-SM I-D before RFC2117 was published specified the
492 * following representation for unicast addresses. However, RFC2117
493 * specified no encoding for unicast addresses with the unicast
494 * address length specified in the header. Therefore, we have to
495 * guess which encoding is being used (Cisco's PIMv2 implementation
496 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
497 * field into a 'unicast-address-length-in-bytes' field. We guess
498 * that it's the draft encoding if this reserved field is zero.
499 *
500 * RFC2362 goes back to the encoded format, and calls the addr length
501 * field "reserved" again.
502 *
503 * The first byte is the address family, from:
504 *
505 * 0 Reserved
506 * 1 IP (IP version 4)
507 * 2 IP6 (IP version 6)
508 * 3 NSAP
509 * 4 HDLC (8-bit multidrop)
510 * 5 BBN 1822
511 * 6 802 (includes all 802 media plus Ethernet "canonical format")
512 * 7 E.163
513 * 8 E.164 (SMDS, Frame Relay, ATM)
514 * 9 F.69 (Telex)
515 * 10 X.121 (X.25, Frame Relay)
516 * 11 IPX
517 * 12 Appletalk
518 * 13 Decnet IV
519 * 14 Banyan Vines
520 * 15 E.164 with NSAP format subaddress
521 *
522 * In addition, the second byte is an "Encoding". 0 is the default
523 * encoding for the address family, and no other encodings are currently
524 * specified.
525 *
526 */
527
528 enum pimv2_addrtype {
529 pimv2_unicast, pimv2_group, pimv2_source
530 };
531
532 /* 0 1 2 3
533 * 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
534 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
535 * | Addr Family | Encoding Type | Unicast Address |
536 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
537 * 0 1 2 3
538 * 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
539 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
540 * | Addr Family | Encoding Type | Reserved | Mask Len |
541 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
542 * | Group multicast Address |
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 | Rsrvd |S|W|R| Mask Len |
548 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
549 * | Source Address |
550 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
551 */
552 static int
553 pimv2_addr_print(netdissect_options *ndo,
554 const u_char *bp, u_int len, enum pimv2_addrtype at,
555 u_int addr_len, int silent)
556 {
557 u_int af;
558 int hdrlen;
559
560 if (addr_len == 0) {
561 if (len < 2)
562 goto trunc;
563 af = GET_U_1(bp);
564 switch (af) {
565 case AFNUM_IP:
566 addr_len = (u_int)sizeof(nd_ipv4);
567 break;
568 case AFNUM_IP6:
569 addr_len = (u_int)sizeof(nd_ipv6);
570 break;
571 default:
572 return -1;
573 }
574 if (GET_U_1(bp + 1) != 0)
575 return -1;
576 hdrlen = 2;
577 } else {
578 switch (addr_len) {
579 case sizeof(nd_ipv4):
580 af = AFNUM_IP;
581 break;
582 case sizeof(nd_ipv6):
583 af = AFNUM_IP6;
584 break;
585 default:
586 return -1;
587 }
588 hdrlen = 0;
589 }
590
591 bp += hdrlen;
592 len -= hdrlen;
593 switch (at) {
594 case pimv2_unicast:
595 if (len < addr_len)
596 goto trunc;
597 ND_TCHECK_LEN(bp, addr_len);
598 if (af == AFNUM_IP) {
599 if (!silent)
600 ND_PRINT("%s", GET_IPADDR_STRING(bp));
601 } else if (af == AFNUM_IP6) {
602 if (!silent)
603 ND_PRINT("%s", GET_IP6ADDR_STRING(bp));
604 }
605 return hdrlen + addr_len;
606 case pimv2_group:
607 case pimv2_source:
608 if (len < addr_len + 2)
609 goto trunc;
610 ND_TCHECK_LEN(bp, addr_len + 2);
611 if (af == AFNUM_IP) {
612 if (!silent) {
613 ND_PRINT("%s", GET_IPADDR_STRING(bp + 2));
614 if (GET_U_1(bp + 1) != 32)
615 ND_PRINT("/%u", GET_U_1(bp + 1));
616 }
617 } else if (af == AFNUM_IP6) {
618 if (!silent) {
619 ND_PRINT("%s", GET_IP6ADDR_STRING(bp + 2));
620 if (GET_U_1(bp + 1) != 128)
621 ND_PRINT("/%u", GET_U_1(bp + 1));
622 }
623 }
624 if (GET_U_1(bp) && !silent) {
625 if (at == pimv2_group) {
626 ND_PRINT("(0x%02x)", GET_U_1(bp));
627 } else {
628 ND_PRINT("(%s%s%s",
629 GET_U_1(bp) & 0x04 ? "S" : "",
630 GET_U_1(bp) & 0x02 ? "W" : "",
631 GET_U_1(bp) & 0x01 ? "R" : "");
632 if (GET_U_1(bp) & 0xf8) {
633 ND_PRINT("+0x%02x",
634 GET_U_1(bp) & 0xf8);
635 }
636 ND_PRINT(")");
637 }
638 }
639 return hdrlen + 2 + addr_len;
640 default:
641 return -1;
642 }
643 trunc:
644 return -1;
645 }
646
647 enum checksum_status {
648 CORRECT,
649 INCORRECT,
650 UNVERIFIED
651 };
652
653 static enum checksum_status
654 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
655 const u_char *bp2, u_int len)
656 {
657 const struct ip *ip;
658 u_int cksum;
659
660 if (!ND_TTEST_LEN(bp, len)) {
661 /* We don't have all the data. */
662 return (UNVERIFIED);
663 }
664 ip = (const struct ip *)bp2;
665 if (IP_V(ip) == 4) {
666 struct cksum_vec vec[1];
667
668 vec[0].ptr = bp;
669 vec[0].len = len;
670 cksum = in_cksum(vec, 1);
671 return (cksum ? INCORRECT : CORRECT);
672 } else if (IP_V(ip) == 6) {
673 const struct ip6_hdr *ip6;
674
675 ip6 = (const struct ip6_hdr *)bp2;
676 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
677 return (cksum ? INCORRECT : CORRECT);
678 } else {
679 return (UNVERIFIED);
680 }
681 }
682
683 static void
684 pimv2_print(netdissect_options *ndo,
685 const u_char *bp, u_int len, const u_char *bp2)
686 {
687 const struct pim *pim = (const struct pim *)bp;
688 int advance;
689 int subtype;
690 enum checksum_status cksum_status;
691 u_int pim_typever;
692 u_int pimv2_addr_len;
693
694 ndo->ndo_protocol = "pimv2";
695 if (len < 2) {
696 ND_PRINT("[length %u < 2]", len);
697 nd_print_invalid(ndo);
698 return;
699 }
700 pim_typever = GET_U_1(pim->pim_typever);
701 /* RFC5015 allocates the high 4 bits of pim_rsv for "subtype". */
702 pimv2_addr_len = GET_U_1(pim->pim_rsv) & 0x0f;
703 if (pimv2_addr_len != 0)
704 ND_PRINT(", RFC2117-encoding");
705
706 if (len < 4) {
707 ND_PRINT("[length %u < 4]", len);
708 nd_print_invalid(ndo);
709 return;
710 }
711 ND_PRINT(", cksum 0x%04x ", GET_BE_U_2(pim->pim_cksum));
712 if (GET_BE_U_2(pim->pim_cksum) == 0) {
713 ND_PRINT("(unverified)");
714 } else {
715 if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) {
716 /*
717 * The checksum only covers the packet header,
718 * not the encapsulated packet.
719 */
720 cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
721 if (cksum_status == INCORRECT) {
722 /*
723 * To quote RFC 4601, "For interoperability
724 * reasons, a message carrying a checksum
725 * calculated over the entire PIM Register
726 * message should also be accepted."
727 */
728 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
729 }
730 } else {
731 /*
732 * The checksum covers the entire packet.
733 */
734 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
735 }
736 switch (cksum_status) {
737
738 case CORRECT:
739 ND_PRINT("(correct)");
740 break;
741
742 case INCORRECT:
743 ND_PRINT("(incorrect)");
744 break;
745
746 case UNVERIFIED:
747 ND_PRINT("(unverified)");
748 break;
749 }
750 }
751 bp += 4;
752 len -= 4;
753
754 switch (PIM_TYPE(pim_typever)) {
755 case PIMV2_TYPE_HELLO:
756 {
757 uint16_t otype, olen;
758 while (len != 0) {
759 if (len < 4)
760 goto trunc;
761 otype = GET_BE_U_2(bp);
762 olen = GET_BE_U_2(bp + 2);
763 ND_PRINT("\n\t %s Option (%u), length %u, Value: ",
764 tok2str(pimv2_hello_option_values, "Unknown", otype),
765 otype,
766 olen);
767 bp += 4;
768 len -= 4;
769
770 if (len < olen)
771 goto trunc;
772 ND_TCHECK_LEN(bp, olen);
773 switch (otype) {
774 case PIMV2_HELLO_OPTION_HOLDTIME:
775 if (olen != 2) {
776 ND_PRINT("[option length %u != 2]", olen);
777 nd_print_invalid(ndo);
778 return;
779 } else {
780 unsigned_relts_print(ndo,
781 GET_BE_U_2(bp));
782 }
783 break;
784
785 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
786 if (olen != 4) {
787 ND_PRINT("[option length %u != 4]", olen);
788 nd_print_invalid(ndo);
789 return;
790 } else {
791 char t_bit;
792 uint16_t lan_delay, override_interval;
793 lan_delay = GET_BE_U_2(bp);
794 override_interval = GET_BE_U_2(bp + 2);
795 t_bit = (lan_delay & 0x8000)? 1 : 0;
796 lan_delay &= ~0x8000;
797 ND_PRINT("\n\t T-bit=%u, LAN delay %ums, Override interval %ums",
798 t_bit, lan_delay, override_interval);
799 }
800 break;
801
802 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
803 case PIMV2_HELLO_OPTION_DR_PRIORITY:
804 switch (olen) {
805 case 0:
806 ND_PRINT("Bi-Directional Capability (Old)");
807 break;
808 case 4:
809 ND_PRINT("%u", GET_BE_U_4(bp));
810 break;
811 default:
812 ND_PRINT("[option length %u != 4]", olen);
813 nd_print_invalid(ndo);
814 return;
815 }
816 break;
817
818 case PIMV2_HELLO_OPTION_GENID:
819 if (olen != 4) {
820 ND_PRINT("[option length %u != 4]", olen);
821 nd_print_invalid(ndo);
822 return;
823 } else {
824 ND_PRINT("0x%08x", GET_BE_U_4(bp));
825 }
826 break;
827
828 case PIMV2_HELLO_OPTION_REFRESH_CAP:
829 if (olen != 4) {
830 ND_PRINT("[option length %u != 4]", olen);
831 nd_print_invalid(ndo);
832 return;
833 } else {
834 ND_PRINT("v%u", GET_U_1(bp));
835 if (GET_U_1(bp + 1) != 0) {
836 ND_PRINT(", interval ");
837 unsigned_relts_print(ndo,
838 GET_U_1(bp + 1));
839 }
840 if (GET_BE_U_2(bp + 2) != 0) {
841 ND_PRINT(" ?0x%04x?",
842 GET_BE_U_2(bp + 2));
843 }
844 }
845 break;
846
847 case PIMV2_HELLO_OPTION_BIDIR_CAP:
848 break;
849
850 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
851 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
852 if (ndo->ndo_vflag > 1) {
853 const u_char *ptr = bp;
854 u_int plen = len;
855 while (ptr < (bp+olen)) {
856 ND_PRINT("\n\t ");
857 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
858 if (advance < 0)
859 goto trunc;
860 ptr += advance;
861 plen -= advance;
862 }
863 }
864 break;
865 default:
866 if (ndo->ndo_vflag <= 1)
867 print_unknown_data(ndo, bp, "\n\t ", olen);
868 break;
869 }
870 /* do we want to see an additionally hexdump ? */
871 if (ndo->ndo_vflag> 1)
872 print_unknown_data(ndo, bp, "\n\t ", olen);
873 bp += olen;
874 len -= olen;
875 }
876 break;
877 }
878
879 case PIMV2_TYPE_REGISTER:
880 {
881 const struct ip *ip;
882
883 if (len < 4)
884 goto trunc;
885 ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN);
886
887 ND_PRINT(", Flags [ %s ]\n\t",
888 tok2str(pimv2_register_flag_values,
889 "none",
890 GET_BE_U_4(bp)));
891
892 bp += 4; len -= 4;
893 /* encapsulated multicast packet */
894 if (len == 0)
895 goto trunc;
896 ip = (const struct ip *)bp;
897 switch (IP_V(ip)) {
898 case 0: /* Null header */
899 ND_PRINT("IP-Null-header %s > %s",
900 GET_IPADDR_STRING(ip->ip_src),
901 GET_IPADDR_STRING(ip->ip_dst));
902 break;
903
904 case 4: /* IPv4 */
905 ip_print(ndo, bp, len);
906 break;
907
908 case 6: /* IPv6 */
909 ip6_print(ndo, bp, len);
910 break;
911
912 default:
913 ND_PRINT("IP ver %u", IP_V(ip));
914 break;
915 }
916 break;
917 }
918
919 case PIMV2_TYPE_REGISTER_STOP:
920 ND_PRINT(" group=");
921 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
922 goto trunc;
923 bp += advance; len -= advance;
924 ND_PRINT(" source=");
925 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
926 goto trunc;
927 bp += advance; len -= advance;
928 break;
929
930 case PIMV2_TYPE_JOIN_PRUNE:
931 case PIMV2_TYPE_GRAFT:
932 case PIMV2_TYPE_GRAFT_ACK:
933
934
935 /*
936 * 0 1 2 3
937 * 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
938 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
939 * |PIM Ver| Type | Addr length | Checksum |
940 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
941 * | Unicast-Upstream Neighbor Address |
942 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
943 * | Reserved | Num groups | Holdtime |
944 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
945 * | Encoded-Multicast Group Address-1 |
946 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
947 * | Number of Joined Sources | Number of Pruned Sources |
948 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
949 * | Encoded-Joined Source Address-1 |
950 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
951 * | . |
952 * | . |
953 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
954 * | Encoded-Joined Source Address-n |
955 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
956 * | Encoded-Pruned Source Address-1 |
957 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
958 * | . |
959 * | . |
960 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
961 * | Encoded-Pruned Source Address-n |
962 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
963 * | . |
964 * | . |
965 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
966 * | Encoded-Multicast Group Address-n |
967 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
968 */
969
970 {
971 uint8_t ngroup;
972 uint16_t holdtime;
973 uint16_t njoin;
974 uint16_t nprune;
975 u_int i, j;
976
977 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
978 ND_PRINT(", upstream-neighbor: ");
979 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
980 goto trunc;
981 bp += advance; len -= advance;
982 }
983 if (len < 4)
984 goto trunc;
985 ND_TCHECK_4(bp);
986 ngroup = GET_U_1(bp + 1);
987 holdtime = GET_BE_U_2(bp + 2);
988 ND_PRINT("\n\t %u group(s)", ngroup);
989 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
990 ND_PRINT(", holdtime: ");
991 if (holdtime == 0xffff)
992 ND_PRINT("infinite");
993 else
994 unsigned_relts_print(ndo, holdtime);
995 }
996 bp += 4; len -= 4;
997 for (i = 0; i < ngroup; i++) {
998 ND_PRINT("\n\t group #%u: ", i+1);
999 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1000 goto trunc;
1001 bp += advance; len -= advance;
1002 if (len < 4)
1003 goto trunc;
1004 ND_TCHECK_4(bp);
1005 njoin = GET_BE_U_2(bp);
1006 nprune = GET_BE_U_2(bp + 2);
1007 ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune);
1008 bp += 4; len -= 4;
1009 for (j = 0; j < njoin; j++) {
1010 ND_PRINT("\n\t joined source #%u: ", j+1);
1011 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1012 goto trunc;
1013 bp += advance; len -= advance;
1014 }
1015 for (j = 0; j < nprune; j++) {
1016 ND_PRINT("\n\t pruned source #%u: ", j+1);
1017 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1018 goto trunc;
1019 bp += advance; len -= advance;
1020 }
1021 }
1022 break;
1023 }
1024
1025 case PIMV2_TYPE_BOOTSTRAP:
1026 {
1027 u_int i, j, frpcnt;
1028
1029 /* Fragment Tag, Hash Mask len, and BSR-priority */
1030 if (len < 2)
1031 goto trunc;
1032 ND_PRINT(" tag=%x", GET_BE_U_2(bp));
1033 bp += 2;
1034 len -= 2;
1035 if (len < 1)
1036 goto trunc;
1037 ND_PRINT(" hashmlen=%u", GET_U_1(bp));
1038 if (len < 2)
1039 goto trunc;
1040 ND_TCHECK_1(bp + 2);
1041 ND_PRINT(" BSRprio=%u", GET_U_1(bp + 1));
1042 bp += 2;
1043 len -= 2;
1044
1045 /* Encoded-Unicast-BSR-Address */
1046 ND_PRINT(" BSR=");
1047 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1048 goto trunc;
1049 bp += advance;
1050 len -= advance;
1051
1052 for (i = 0; len > 0; i++) {
1053 /* Encoded-Group Address */
1054 ND_PRINT(" (group%u: ", i);
1055 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1056 goto trunc;
1057 bp += advance;
1058 len -= advance;
1059
1060 /* RP-Count, Frag RP-Cnt, and rsvd */
1061 if (len < 1)
1062 goto trunc;
1063 ND_PRINT(" RPcnt=%u", GET_U_1(bp));
1064 if (len < 2)
1065 goto trunc;
1066 frpcnt = GET_U_1(bp + 1);
1067 ND_PRINT(" FRPcnt=%u", frpcnt);
1068 if (len < 4)
1069 goto trunc;
1070 bp += 4;
1071 len -= 4;
1072
1073 for (j = 0; j < frpcnt && len > 0; j++) {
1074 /* each RP info */
1075 ND_PRINT(" RP%u=", j);
1076 if ((advance = pimv2_addr_print(ndo, bp, len,
1077 pimv2_unicast,
1078 pimv2_addr_len,
1079 0)) < 0)
1080 goto trunc;
1081 bp += advance;
1082 len -= advance;
1083
1084 if (len < 2)
1085 goto trunc;
1086 ND_PRINT(",holdtime=");
1087 unsigned_relts_print(ndo,
1088 GET_BE_U_2(bp));
1089 if (len < 3)
1090 goto trunc;
1091 ND_PRINT(",prio=%u", GET_U_1(bp + 2));
1092 if (len < 4)
1093 goto trunc;
1094 bp += 4;
1095 len -= 4;
1096 }
1097 ND_PRINT(")");
1098 }
1099 break;
1100 }
1101 case PIMV2_TYPE_ASSERT:
1102 ND_PRINT(" group=");
1103 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1104 goto trunc;
1105 bp += advance; len -= advance;
1106 ND_PRINT(" src=");
1107 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1108 goto trunc;
1109 bp += advance; len -= advance;
1110 if (len < 8)
1111 goto trunc;
1112 ND_TCHECK_8(bp);
1113 if (GET_U_1(bp) & 0x80)
1114 ND_PRINT(" RPT");
1115 ND_PRINT(" pref=%u", GET_BE_U_4(bp) & 0x7fffffff);
1116 ND_PRINT(" metric=%u", GET_BE_U_4(bp + 4));
1117 break;
1118
1119 case PIMV2_TYPE_CANDIDATE_RP:
1120 {
1121 u_int i, pfxcnt;
1122
1123 /* Prefix-Cnt, Priority, and Holdtime */
1124 if (len < 1)
1125 goto trunc;
1126 ND_PRINT(" prefix-cnt=%u", GET_U_1(bp));
1127 pfxcnt = GET_U_1(bp);
1128 if (len < 2)
1129 goto trunc;
1130 ND_PRINT(" prio=%u", GET_U_1(bp + 1));
1131 if (len < 4)
1132 goto trunc;
1133 ND_PRINT(" holdtime=");
1134 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
1135 bp += 4;
1136 len -= 4;
1137
1138 /* Encoded-Unicast-RP-Address */
1139 ND_PRINT(" RP=");
1140 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1141 goto trunc;
1142 bp += advance;
1143 len -= advance;
1144
1145 /* Encoded-Group Addresses */
1146 for (i = 0; i < pfxcnt && len > 0; i++) {
1147 ND_PRINT(" Group%u=", i);
1148 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1149 goto trunc;
1150 bp += advance;
1151 len -= advance;
1152 }
1153 break;
1154 }
1155
1156 case PIMV2_TYPE_PRUNE_REFRESH:
1157 ND_PRINT(" src=");
1158 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1159 goto trunc;
1160 bp += advance;
1161 len -= advance;
1162 ND_PRINT(" grp=");
1163 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1164 goto trunc;
1165 bp += advance;
1166 len -= advance;
1167 ND_PRINT(" forwarder=");
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 if (len < 2)
1173 goto trunc;
1174 ND_PRINT(" TUNR ");
1175 unsigned_relts_print(ndo, GET_BE_U_2(bp));
1176 break;
1177
1178 case PIMV2_TYPE_DF_ELECTION:
1179 subtype = PIM_SUBTYPE(GET_U_1(pim->pim_rsv));
1180 ND_PRINT("\n\t %s,", tok2str( pimv2_df_election_flag_values,
1181 "Unknown", subtype) );
1182
1183 ND_PRINT(" rpa=");
1184 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1185 goto trunc;
1186 }
1187 bp += advance;
1188 len -= advance;
1189 ND_PRINT(" sender pref=%u", GET_BE_U_4(bp) );
1190 ND_PRINT(" sender metric=%u", GET_BE_U_4(bp + 4));
1191
1192 bp += 8;
1193 len -= 8;
1194
1195 switch (subtype) {
1196 case PIMV2_DF_ELECTION_BACKOFF:
1197 case PIMV2_DF_ELECTION_PASS:
1198 ND_PRINT("\n\t %s addr=", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype));
1199 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1200 goto trunc;
1201 }
1202 bp += advance;
1203 len -= advance;
1204
1205 ND_PRINT(" %s pref=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp) );
1206 ND_PRINT(" %s metric=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp + 4));
1207
1208 bp += 8;
1209 len -= 8;
1210
1211 if (subtype == PIMV2_DF_ELECTION_BACKOFF) {
1212 ND_PRINT(" interval %dms", GET_BE_U_2(bp));
1213 }
1214
1215 break;
1216 default:
1217 break;
1218 }
1219 break;
1220
1221 default:
1222 ND_PRINT(" [type %u]", PIM_TYPE(pim_typever));
1223 break;
1224 }
1225
1226 return;
1227
1228 trunc:
1229 nd_print_trunc(ndo);
1230 }
[mirror] the TCPdump network dissector