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 #include <sys/cdefs.h>
23 #ifndef lint
24 __RCSID("$NetBSD: print-pim.c,v 1.12 2024/09/02 16:15:32 christos Exp $");
25 #endif
26
27 /* \summary: Protocol Independent Multicast (PIM) printer */
28
29 #include <config.h>
30
31 #include "netdissect-stdinc.h"
32
33 #include "netdissect.h"
34 #include "addrtoname.h"
35 #include "extract.h"
36
37 #include "ip.h"
38 #include "ip6.h"
39 #include "ipproto.h"
40
41 #define PIMV1_TYPE_QUERY 0
42 #define PIMV1_TYPE_REGISTER 1
43 #define PIMV1_TYPE_REGISTER_STOP 2
44 #define PIMV1_TYPE_JOIN_PRUNE 3
45 #define PIMV1_TYPE_RP_REACHABILITY 4
46 #define PIMV1_TYPE_ASSERT 5
47 #define PIMV1_TYPE_GRAFT 6
48 #define PIMV1_TYPE_GRAFT_ACK 7
49
50 static const struct tok pimv1_type_str[] = {
51 { PIMV1_TYPE_QUERY, "Query" },
52 { PIMV1_TYPE_REGISTER, "Register" },
53 { PIMV1_TYPE_REGISTER_STOP, "Register-Stop" },
54 { PIMV1_TYPE_JOIN_PRUNE, "Join/Prune" },
55 { PIMV1_TYPE_RP_REACHABILITY, "RP-reachable" },
56 { PIMV1_TYPE_ASSERT, "Assert" },
57 { PIMV1_TYPE_GRAFT, "Graft" },
58 { PIMV1_TYPE_GRAFT_ACK, "Graft-ACK" },
59 { 0, NULL }
60 };
61
62 #define PIMV2_TYPE_HELLO 0
63 #define PIMV2_TYPE_REGISTER 1
64 #define PIMV2_TYPE_REGISTER_STOP 2
65 #define PIMV2_TYPE_JOIN_PRUNE 3
66 #define PIMV2_TYPE_BOOTSTRAP 4
67 #define PIMV2_TYPE_ASSERT 5
68 #define PIMV2_TYPE_GRAFT 6
69 #define PIMV2_TYPE_GRAFT_ACK 7
70 #define PIMV2_TYPE_CANDIDATE_RP 8
71 #define PIMV2_TYPE_PRUNE_REFRESH 9
72 #define PIMV2_TYPE_DF_ELECTION 10
73 #define PIMV2_TYPE_ECMP_REDIRECT 11
74
75 static const struct tok pimv2_type_values[] = {
76 { PIMV2_TYPE_HELLO, "Hello" },
77 { PIMV2_TYPE_REGISTER, "Register" },
78 { PIMV2_TYPE_REGISTER_STOP, "Register Stop" },
79 { PIMV2_TYPE_JOIN_PRUNE, "Join / Prune" },
80 { PIMV2_TYPE_BOOTSTRAP, "Bootstrap" },
81 { PIMV2_TYPE_ASSERT, "Assert" },
82 { PIMV2_TYPE_GRAFT, "Graft" },
83 { PIMV2_TYPE_GRAFT_ACK, "Graft Acknowledgement" },
84 { PIMV2_TYPE_CANDIDATE_RP, "Candidate RP Advertisement" },
85 { PIMV2_TYPE_PRUNE_REFRESH, "Prune Refresh" },
86 { PIMV2_TYPE_DF_ELECTION, "DF Election" },
87 { PIMV2_TYPE_ECMP_REDIRECT, "ECMP Redirect" },
88 { 0, NULL}
89 };
90
91 #define PIMV2_HELLO_OPTION_HOLDTIME 1
92 #define PIMV2_HELLO_OPTION_LANPRUNEDELAY 2
93 #define PIMV2_HELLO_OPTION_DR_PRIORITY_OLD 18
94 #define PIMV2_HELLO_OPTION_DR_PRIORITY 19
95 #define PIMV2_HELLO_OPTION_GENID 20
96 #define PIMV2_HELLO_OPTION_REFRESH_CAP 21
97 #define PIMV2_HELLO_OPTION_BIDIR_CAP 22
98 #define PIMV2_HELLO_OPTION_ADDRESS_LIST 24
99 #define PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD 65001
100
101 static const struct tok pimv2_hello_option_values[] = {
102 { PIMV2_HELLO_OPTION_HOLDTIME, "Hold Time" },
103 { PIMV2_HELLO_OPTION_LANPRUNEDELAY, "LAN Prune Delay" },
104 { PIMV2_HELLO_OPTION_DR_PRIORITY_OLD, "DR Priority (Old)" },
105 { PIMV2_HELLO_OPTION_DR_PRIORITY, "DR Priority" },
106 { PIMV2_HELLO_OPTION_GENID, "Generation ID" },
107 { PIMV2_HELLO_OPTION_REFRESH_CAP, "State Refresh Capability" },
108 { PIMV2_HELLO_OPTION_BIDIR_CAP, "Bi-Directional Capability" },
109 { PIMV2_HELLO_OPTION_ADDRESS_LIST, "Address List" },
110 { PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD, "Address List (Old)" },
111 { 0, NULL}
112 };
113
114 #define PIMV2_REGISTER_FLAG_LEN 4
115 #define PIMV2_REGISTER_FLAG_BORDER 0x80000000
116 #define PIMV2_REGISTER_FLAG_NULL 0x40000000
117
118 static const struct tok pimv2_register_flag_values[] = {
119 { PIMV2_REGISTER_FLAG_BORDER, "Border" },
120 { PIMV2_REGISTER_FLAG_NULL, "Null" },
121 { 0, NULL}
122 };
123
124 #define PIMV2_DF_ELECTION_OFFER 1
125 #define PIMV2_DF_ELECTION_WINNER 2
126 #define PIMV2_DF_ELECTION_BACKOFF 3
127 #define PIMV2_DF_ELECTION_PASS 4
128
129 static const struct tok pimv2_df_election_flag_values[] = {
130 { PIMV2_DF_ELECTION_OFFER, "Offer" },
131 { PIMV2_DF_ELECTION_WINNER, "Winner" },
132 { PIMV2_DF_ELECTION_BACKOFF, "Backoff" },
133 { PIMV2_DF_ELECTION_PASS, "Pass" },
134 { 0, NULL}
135 };
136
137 #define PIMV2_DF_ELECTION_PASS_BACKOFF_STR(x) ( \
138 x == PIMV2_DF_ELECTION_BACKOFF ? "offer" : "new winner" )
139
140
141 /*
142 * XXX: We consider a case where IPv6 is not ready yet for portability,
143 * but PIM dependent definitions should be independent of IPv6...
144 */
145
146 struct pim {
147 nd_uint8_t pim_typever;
148 /* upper 4bit: PIM version number; 2 for PIMv2 */
149 /* lower 4bit: the PIM message type, currently they are:
150 * Hello, Register, Register-Stop, Join/Prune,
151 * Bootstrap, Assert, Graft (PIM-DM only),
152 * Graft-Ack (PIM-DM only), C-RP-Adv
153 */
154 #define PIM_VER(x) (((x) & 0xf0) >> 4)
155 #define PIM_TYPE(x) ((x) & 0x0f)
156 nd_uint8_t pim_rsv; /* Reserved in v1, subtype+address length in v2 */
157 #define PIM_SUBTYPE(x) (((x) & 0xf0) >> 4)
158 nd_uint16_t pim_cksum; /* IP style check sum */
159 };
160
161 static void pimv2_print(netdissect_options *, const u_char *bp, u_int len, const u_char *);
162
163 static void
pimv1_join_prune_print(netdissect_options * ndo,const u_char * bp,u_int len)164 pimv1_join_prune_print(netdissect_options *ndo,
165 const u_char *bp, u_int len)
166 {
167 u_int ngroups, njoin, nprune;
168 u_int njp;
169
170 /* If it's a single group and a single source, use 1-line output. */
171 if (ND_TTEST_LEN(bp, 30) && GET_U_1(bp + 11) == 1 &&
172 ((njoin = GET_BE_U_2(bp + 20)) + GET_BE_U_2(bp + 22)) == 1) {
173 u_int hold;
174
175 ND_PRINT(" RPF %s ", GET_IPADDR_STRING(bp));
176 hold = GET_BE_U_2(bp + 6);
177 if (hold != 180) {
178 ND_PRINT("Hold ");
179 unsigned_relts_print(ndo, hold);
180 }
181 ND_PRINT("%s (%s/%u, %s", njoin ? "Join" : "Prune",
182 GET_IPADDR_STRING(bp + 26), GET_U_1(bp + 25) & 0x3f,
183 GET_IPADDR_STRING(bp + 12));
184 if (GET_BE_U_4(bp + 16) != 0xffffffff)
185 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 16));
186 ND_PRINT(") %s%s %s",
187 (GET_U_1(bp + 24) & 0x01) ? "Sparse" : "Dense",
188 (GET_U_1(bp + 25) & 0x80) ? " WC" : "",
189 (GET_U_1(bp + 25) & 0x40) ? "RP" : "SPT");
190 return;
191 }
192
193 if (len < sizeof(nd_ipv4))
194 goto trunc;
195 if (ndo->ndo_vflag > 1)
196 ND_PRINT("\n");
197 ND_PRINT(" Upstream Nbr: %s", GET_IPADDR_STRING(bp));
198 bp += 4;
199 len -= 4;
200 if (len < 4)
201 goto trunc;
202 if (ndo->ndo_vflag > 1)
203 ND_PRINT("\n");
204 ND_PRINT(" Hold time: ");
205 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
206 if (ndo->ndo_vflag < 2)
207 return;
208 bp += 4;
209 len -= 4;
210
211 if (len < 4)
212 goto trunc;
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_PRINT("\n\tGroup: %s", GET_IPADDR_STRING(bp));
224 bp += 4;
225 len -= 4;
226 if (len < 4)
227 goto trunc;
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 }
263
264 void
pimv1_print(netdissect_options * ndo,const u_char * bp,u_int len)265 pimv1_print(netdissect_options *ndo,
266 const u_char *bp, u_int len)
267 {
268 u_char type;
269
270 ndo->ndo_protocol = "pimv1";
271 type = GET_U_1(bp + 1);
272
273 ND_PRINT(" %s", tok2str(pimv1_type_str, "[type %u]", type));
274 switch (type) {
275 case PIMV1_TYPE_QUERY:
276 if (ND_TTEST_1(bp + 8)) {
277 switch (GET_U_1(bp + 8) >> 4) {
278 case 0:
279 ND_PRINT(" Dense-mode");
280 break;
281 case 1:
282 ND_PRINT(" Sparse-mode");
283 break;
284 case 2:
285 ND_PRINT(" Sparse-Dense-mode");
286 break;
287 default:
288 ND_PRINT(" mode-%u", GET_U_1(bp + 8) >> 4);
289 break;
290 }
291 }
292 if (ndo->ndo_vflag) {
293 ND_PRINT(" (Hold-time ");
294 unsigned_relts_print(ndo, GET_BE_U_2(bp + 10));
295 ND_PRINT(")");
296 }
297 break;
298
299 case PIMV1_TYPE_REGISTER:
300 ND_TCHECK_LEN(bp + 8, 20); /* ip header */
301 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 20),
302 GET_IPADDR_STRING(bp + 24));
303 break;
304 case PIMV1_TYPE_REGISTER_STOP:
305 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 8),
306 GET_IPADDR_STRING(bp + 12));
307 break;
308 case PIMV1_TYPE_RP_REACHABILITY:
309 if (ndo->ndo_vflag) {
310 ND_PRINT(" group %s", GET_IPADDR_STRING(bp + 8));
311 if (GET_BE_U_4(bp + 12) != 0xffffffff)
312 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
313 ND_PRINT(" RP %s hold ", GET_IPADDR_STRING(bp + 16));
314 unsigned_relts_print(ndo, GET_BE_U_2(bp + 22));
315 }
316 break;
317 case PIMV1_TYPE_ASSERT:
318 ND_PRINT(" for %s > %s", GET_IPADDR_STRING(bp + 16),
319 GET_IPADDR_STRING(bp + 8));
320 if (GET_BE_U_4(bp + 12) != 0xffffffff)
321 ND_PRINT("/%s", GET_IPADDR_STRING(bp + 12));
322 ND_PRINT(" %s pref %u metric %u",
323 (GET_U_1(bp + 20) & 0x80) ? "RP-tree" : "SPT",
324 GET_BE_U_4(bp + 20) & 0x7fffffff,
325 GET_BE_U_4(bp + 24));
326 break;
327 case PIMV1_TYPE_JOIN_PRUNE:
328 case PIMV1_TYPE_GRAFT:
329 case PIMV1_TYPE_GRAFT_ACK:
330 if (ndo->ndo_vflag) {
331 if (len < 8)
332 goto trunc;
333 pimv1_join_prune_print(ndo, bp + 8, len - 8);
334 }
335 break;
336 }
337 if ((GET_U_1(bp + 4) >> 4) != 1)
338 ND_PRINT(" [v%u]", GET_U_1(bp + 4) >> 4);
339 return;
340
341 trunc:
342 nd_print_trunc(ndo);
343 }
344
345 /*
346 * auto-RP is a cisco protocol, documented at
347 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
348 *
349 * This implements version 1+, dated Sept 9, 1998.
350 */
351 void
cisco_autorp_print(netdissect_options * ndo,const u_char * bp,u_int len)352 cisco_autorp_print(netdissect_options *ndo,
353 const u_char *bp, u_int len)
354 {
355 u_int type;
356 u_int numrps;
357 u_int hold;
358
359 ndo->ndo_protocol = "cisco_autorp";
360 if (len < 8)
361 goto trunc;
362 ND_PRINT(" auto-rp ");
363 type = GET_U_1(bp);
364 switch (type) {
365 case 0x11:
366 ND_PRINT("candidate-advert");
367 break;
368 case 0x12:
369 ND_PRINT("mapping");
370 break;
371 default:
372 ND_PRINT("type-0x%02x", type);
373 break;
374 }
375
376 numrps = GET_U_1(bp + 1);
377
378 ND_PRINT(" Hold ");
379 hold = GET_BE_U_2(bp + 2);
380 if (hold)
381 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
382 else
383 ND_PRINT("FOREVER");
384
385 /* Next 4 bytes are reserved. */
386
387 bp += 8; len -= 8;
388
389 /*XXX skip unless -v? */
390
391 /*
392 * Rest of packet:
393 * numrps entries of the form:
394 * 32 bits: RP
395 * 6 bits: reserved
396 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
397 * 8 bits: # of entries for this RP
398 * each entry: 7 bits: reserved, 1 bit: negative,
399 * 8 bits: mask 32 bits: source
400 * lather, rinse, repeat.
401 */
402 while (numrps != 0) {
403 u_int nentries;
404 char s;
405
406 if (len < 4)
407 goto trunc;
408 ND_PRINT(" RP %s", GET_IPADDR_STRING(bp));
409 bp += 4;
410 len -= 4;
411 if (len < 1)
412 goto trunc;
413 switch (GET_U_1(bp) & 0x3) {
414 case 0: ND_PRINT(" PIMv?");
415 break;
416 case 1: ND_PRINT(" PIMv1");
417 break;
418 case 2: ND_PRINT(" PIMv2");
419 break;
420 case 3: ND_PRINT(" PIMv1+2");
421 break;
422 }
423 if (GET_U_1(bp) & 0xfc)
424 ND_PRINT(" [rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
425 bp += 1;
426 len -= 1;
427 if (len < 1)
428 goto trunc;
429 nentries = GET_U_1(bp);
430 bp += 1;
431 len -= 1;
432 s = ' ';
433 while (nentries != 0) {
434 if (len < 6)
435 goto trunc;
436 ND_PRINT("%c%s%s/%u", s, GET_U_1(bp) & 1 ? "!" : "",
437 GET_IPADDR_STRING(bp + 2), GET_U_1(bp + 1));
438 if (GET_U_1(bp) & 0x02) {
439 ND_PRINT(" bidir");
440 }
441 if (GET_U_1(bp) & 0xfc) {
442 ND_PRINT("[rsvd=0x%02x]", GET_U_1(bp) & 0xfc);
443 }
444 s = ',';
445 bp += 6; len -= 6;
446 nentries--;
447 }
448 numrps--;
449 }
450 return;
451
452 trunc:
453 nd_print_trunc(ndo);
454 }
455
456 void
pim_print(netdissect_options * ndo,const u_char * bp,u_int len,const u_char * bp2)457 pim_print(netdissect_options *ndo,
458 const u_char *bp, u_int len, const u_char *bp2)
459 {
460 const struct pim *pim = (const struct pim *)bp;
461 uint8_t pim_typever;
462
463 ndo->ndo_protocol = "pim";
464
465 pim_typever = GET_U_1(pim->pim_typever);
466 switch (PIM_VER(pim_typever)) {
467 case 2:
468 if (!ndo->ndo_vflag) {
469 ND_PRINT("PIMv%u, %s, length %u",
470 PIM_VER(pim_typever),
471 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)),
472 len);
473 return;
474 } else {
475 ND_PRINT("PIMv%u, length %u\n\t%s",
476 PIM_VER(pim_typever),
477 len,
478 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim_typever)));
479 pimv2_print(ndo, bp, len, bp2);
480 }
481 break;
482 default:
483 ND_PRINT("PIMv%u, length %u",
484 PIM_VER(pim_typever),
485 len);
486 break;
487 }
488 }
489
490 /*
491 * PIMv2 uses encoded address representations.
492 *
493 * The last PIM-SM I-D before RFC2117 was published specified the
494 * following representation for unicast addresses. However, RFC2117
495 * specified no encoding for unicast addresses with the unicast
496 * address length specified in the header. Therefore, we have to
497 * guess which encoding is being used (Cisco's PIMv2 implementation
498 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
499 * field into a 'unicast-address-length-in-bytes' field. We guess
500 * that it's the draft encoding if this reserved field is zero.
501 *
502 * RFC2362 goes back to the encoded format, and calls the addr length
503 * field "reserved" again.
504 *
505 * The first byte is the address family, from:
506 *
507 * 0 Reserved
508 * 1 IP (IP version 4)
509 * 2 IP6 (IP version 6)
510 * 3 NSAP
511 * 4 HDLC (8-bit multidrop)
512 * 5 BBN 1822
513 * 6 802 (includes all 802 media plus Ethernet "canonical format")
514 * 7 E.163
515 * 8 E.164 (SMDS, Frame Relay, ATM)
516 * 9 F.69 (Telex)
517 * 10 X.121 (X.25, Frame Relay)
518 * 11 IPX
519 * 12 Appletalk
520 * 13 Decnet IV
521 * 14 Banyan Vines
522 * 15 E.164 with NSAP format subaddress
523 *
524 * In addition, the second byte is an "Encoding". 0 is the default
525 * encoding for the address family, and no other encodings are currently
526 * specified.
527 *
528 */
529
530 enum pimv2_addrtype {
531 pimv2_unicast, pimv2_group, pimv2_source
532 };
533
534 /* 0 1 2 3
535 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
536 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
537 * | Addr Family | Encoding Type | Unicast Address |
538 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
539 * 0 1 2 3
540 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
541 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
542 * | Addr Family | Encoding Type | Reserved | Mask Len |
543 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
544 * | Group multicast Address |
545 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
546 * 0 1 2 3
547 * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
548 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
549 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
550 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
551 * | Source Address |
552 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
553 */
554 static int
pimv2_addr_print(netdissect_options * ndo,const u_char * bp,u_int len,enum pimv2_addrtype at,u_int addr_len,int silent)555 pimv2_addr_print(netdissect_options *ndo,
556 const u_char *bp, u_int len, enum pimv2_addrtype at,
557 u_int addr_len, int silent)
558 {
559 u_int af;
560 int hdrlen;
561
562 if (addr_len == 0) {
563 if (len < 2)
564 goto trunc;
565 switch (GET_U_1(bp)) {
566 case 1:
567 af = AF_INET;
568 addr_len = (u_int)sizeof(nd_ipv4);
569 break;
570 case 2:
571 af = AF_INET6;
572 addr_len = (u_int)sizeof(nd_ipv6);
573 break;
574 default:
575 return -1;
576 }
577 if (GET_U_1(bp + 1) != 0)
578 return -1;
579 hdrlen = 2;
580 } else {
581 switch (addr_len) {
582 case sizeof(nd_ipv4):
583 af = AF_INET;
584 break;
585 case sizeof(nd_ipv6):
586 af = AF_INET6;
587 break;
588 default:
589 return -1;
590 break;
591 }
592 hdrlen = 0;
593 }
594
595 bp += hdrlen;
596 len -= hdrlen;
597 switch (at) {
598 case pimv2_unicast:
599 if (len < addr_len)
600 goto trunc;
601 ND_TCHECK_LEN(bp, addr_len);
602 if (af == AF_INET) {
603 if (!silent)
604 ND_PRINT("%s", GET_IPADDR_STRING(bp));
605 } else if (af == AF_INET6) {
606 if (!silent)
607 ND_PRINT("%s", GET_IP6ADDR_STRING(bp));
608 }
609 return hdrlen + addr_len;
610 case pimv2_group:
611 case pimv2_source:
612 if (len < addr_len + 2)
613 goto trunc;
614 ND_TCHECK_LEN(bp, addr_len + 2);
615 if (af == AF_INET) {
616 if (!silent) {
617 ND_PRINT("%s", GET_IPADDR_STRING(bp + 2));
618 if (GET_U_1(bp + 1) != 32)
619 ND_PRINT("/%u", GET_U_1(bp + 1));
620 }
621 } else if (af == AF_INET6) {
622 if (!silent) {
623 ND_PRINT("%s", GET_IP6ADDR_STRING(bp + 2));
624 if (GET_U_1(bp + 1) != 128)
625 ND_PRINT("/%u", GET_U_1(bp + 1));
626 }
627 }
628 if (GET_U_1(bp) && !silent) {
629 if (at == pimv2_group) {
630 ND_PRINT("(0x%02x)", GET_U_1(bp));
631 } else {
632 ND_PRINT("(%s%s%s",
633 GET_U_1(bp) & 0x04 ? "S" : "",
634 GET_U_1(bp) & 0x02 ? "W" : "",
635 GET_U_1(bp) & 0x01 ? "R" : "");
636 if (GET_U_1(bp) & 0xf8) {
637 ND_PRINT("+0x%02x",
638 GET_U_1(bp) & 0xf8);
639 }
640 ND_PRINT(")");
641 }
642 }
643 return hdrlen + 2 + addr_len;
644 default:
645 return -1;
646 }
647 trunc:
648 return -1;
649 }
650
651 enum checksum_status {
652 CORRECT,
653 INCORRECT,
654 UNVERIFIED
655 };
656
657 static enum checksum_status
pimv2_check_checksum(netdissect_options * ndo,const u_char * bp,const u_char * bp2,u_int len)658 pimv2_check_checksum(netdissect_options *ndo, const u_char *bp,
659 const u_char *bp2, u_int len)
660 {
661 const struct ip *ip;
662 u_int cksum;
663
664 if (!ND_TTEST_LEN(bp, len)) {
665 /* We don't have all the data. */
666 return (UNVERIFIED);
667 }
668 ip = (const struct ip *)bp2;
669 if (IP_V(ip) == 4) {
670 struct cksum_vec vec[1];
671
672 vec[0].ptr = bp;
673 vec[0].len = len;
674 cksum = in_cksum(vec, 1);
675 return (cksum ? INCORRECT : CORRECT);
676 } else if (IP_V(ip) == 6) {
677 const struct ip6_hdr *ip6;
678
679 ip6 = (const struct ip6_hdr *)bp2;
680 cksum = nextproto6_cksum(ndo, ip6, bp, len, len, IPPROTO_PIM);
681 return (cksum ? INCORRECT : CORRECT);
682 } else {
683 return (UNVERIFIED);
684 }
685 }
686
687 static void
pimv2_print(netdissect_options * ndo,const u_char * bp,u_int len,const u_char * bp2)688 pimv2_print(netdissect_options *ndo,
689 const u_char *bp, u_int len, const u_char *bp2)
690 {
691 const struct pim *pim = (const struct pim *)bp;
692 int advance;
693 int subtype;
694 enum checksum_status cksum_status;
695 u_int pim_typever;
696 u_int pimv2_addr_len;
697
698 ndo->ndo_protocol = "pimv2";
699 if (len < 2) {
700 ND_PRINT("[length %u < 2]", len);
701 nd_print_invalid(ndo);
702 return;
703 }
704 pim_typever = GET_U_1(pim->pim_typever);
705 /* RFC5015 allocates the high 4 bits of pim_rsv for "subtype". */
706 pimv2_addr_len = GET_U_1(pim->pim_rsv) & 0x0f;
707 if (pimv2_addr_len != 0)
708 ND_PRINT(", RFC2117-encoding");
709
710 if (len < 4) {
711 ND_PRINT("[length %u < 4]", len);
712 nd_print_invalid(ndo);
713 return;
714 }
715 ND_PRINT(", cksum 0x%04x ", GET_BE_U_2(pim->pim_cksum));
716 if (GET_BE_U_2(pim->pim_cksum) == 0) {
717 ND_PRINT("(unverified)");
718 } else {
719 if (PIM_TYPE(pim_typever) == PIMV2_TYPE_REGISTER) {
720 /*
721 * The checksum only covers the packet header,
722 * not the encapsulated packet.
723 */
724 cksum_status = pimv2_check_checksum(ndo, bp, bp2, 8);
725 if (cksum_status == INCORRECT) {
726 /*
727 * To quote RFC 4601, "For interoperability
728 * reasons, a message carrying a checksum
729 * calculated over the entire PIM Register
730 * message should also be accepted."
731 */
732 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
733 }
734 } else {
735 /*
736 * The checksum covers the entire packet.
737 */
738 cksum_status = pimv2_check_checksum(ndo, bp, bp2, len);
739 }
740 switch (cksum_status) {
741
742 case CORRECT:
743 ND_PRINT("(correct)");
744 break;
745
746 case INCORRECT:
747 ND_PRINT("(incorrect)");
748 break;
749
750 case UNVERIFIED:
751 ND_PRINT("(unverified)");
752 break;
753 }
754 }
755 bp += 4;
756 len -= 4;
757
758 switch (PIM_TYPE(pim_typever)) {
759 case PIMV2_TYPE_HELLO:
760 {
761 uint16_t otype, olen;
762 while (len > 0) {
763 if (len < 4)
764 goto trunc;
765 otype = GET_BE_U_2(bp);
766 olen = GET_BE_U_2(bp + 2);
767 ND_PRINT("\n\t %s Option (%u), length %u, Value: ",
768 tok2str(pimv2_hello_option_values, "Unknown", otype),
769 otype,
770 olen);
771 bp += 4;
772 len -= 4;
773
774 if (len < olen)
775 goto trunc;
776 ND_TCHECK_LEN(bp, olen);
777 switch (otype) {
778 case PIMV2_HELLO_OPTION_HOLDTIME:
779 if (olen != 2) {
780 ND_PRINT("[option length %u != 2]", olen);
781 nd_print_invalid(ndo);
782 return;
783 } else {
784 unsigned_relts_print(ndo,
785 GET_BE_U_2(bp));
786 }
787 break;
788
789 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
790 if (olen != 4) {
791 ND_PRINT("[option length %u != 4]", olen);
792 nd_print_invalid(ndo);
793 return;
794 } else {
795 char t_bit;
796 uint16_t lan_delay, override_interval;
797 lan_delay = GET_BE_U_2(bp);
798 override_interval = GET_BE_U_2(bp + 2);
799 t_bit = (lan_delay & 0x8000)? 1 : 0;
800 lan_delay &= ~0x8000;
801 ND_PRINT("\n\t T-bit=%u, LAN delay %ums, Override interval %ums",
802 t_bit, lan_delay, override_interval);
803 }
804 break;
805
806 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
807 case PIMV2_HELLO_OPTION_DR_PRIORITY:
808 switch (olen) {
809 case 0:
810 ND_PRINT("Bi-Directional Capability (Old)");
811 break;
812 case 4:
813 ND_PRINT("%u", GET_BE_U_4(bp));
814 break;
815 default:
816 ND_PRINT("[option length %u != 4]", olen);
817 nd_print_invalid(ndo);
818 return;
819 break;
820 }
821 break;
822
823 case PIMV2_HELLO_OPTION_GENID:
824 if (olen != 4) {
825 ND_PRINT("[option length %u != 4]", olen);
826 nd_print_invalid(ndo);
827 return;
828 } else {
829 ND_PRINT("0x%08x", GET_BE_U_4(bp));
830 }
831 break;
832
833 case PIMV2_HELLO_OPTION_REFRESH_CAP:
834 if (olen != 4) {
835 ND_PRINT("[option length %u != 4]", olen);
836 nd_print_invalid(ndo);
837 return;
838 } else {
839 ND_PRINT("v%u", GET_U_1(bp));
840 if (GET_U_1(bp + 1) != 0) {
841 ND_PRINT(", interval ");
842 unsigned_relts_print(ndo,
843 GET_U_1(bp + 1));
844 }
845 if (GET_BE_U_2(bp + 2) != 0) {
846 ND_PRINT(" ?0x%04x?",
847 GET_BE_U_2(bp + 2));
848 }
849 }
850 break;
851
852 case PIMV2_HELLO_OPTION_BIDIR_CAP:
853 break;
854
855 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
856 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
857 if (ndo->ndo_vflag > 1) {
858 const u_char *ptr = bp;
859 u_int plen = len;
860 while (ptr < (bp+olen)) {
861 ND_PRINT("\n\t ");
862 advance = pimv2_addr_print(ndo, ptr, plen, pimv2_unicast, pimv2_addr_len, 0);
863 if (advance < 0)
864 goto trunc;
865 ptr += advance;
866 plen -= advance;
867 }
868 }
869 break;
870 default:
871 if (ndo->ndo_vflag <= 1)
872 print_unknown_data(ndo, bp, "\n\t ", olen);
873 break;
874 }
875 /* do we want to see an additionally hexdump ? */
876 if (ndo->ndo_vflag> 1)
877 print_unknown_data(ndo, bp, "\n\t ", olen);
878 bp += olen;
879 len -= olen;
880 }
881 break;
882 }
883
884 case PIMV2_TYPE_REGISTER:
885 {
886 const struct ip *ip;
887
888 if (len < 4)
889 goto trunc;
890 ND_TCHECK_LEN(bp, PIMV2_REGISTER_FLAG_LEN);
891
892 ND_PRINT(", Flags [ %s ]\n\t",
893 tok2str(pimv2_register_flag_values,
894 "none",
895 GET_BE_U_4(bp)));
896
897 bp += 4; len -= 4;
898 /* encapsulated multicast packet */
899 if (len == 0)
900 goto trunc;
901 ip = (const struct ip *)bp;
902 switch (IP_V(ip)) {
903 case 0: /* Null header */
904 ND_PRINT("IP-Null-header %s > %s",
905 GET_IPADDR_STRING(ip->ip_src),
906 GET_IPADDR_STRING(ip->ip_dst));
907 break;
908
909 case 4: /* IPv4 */
910 ip_print(ndo, bp, len);
911 break;
912
913 case 6: /* IPv6 */
914 ip6_print(ndo, bp, len);
915 break;
916
917 default:
918 ND_PRINT("IP ver %u", IP_V(ip));
919 break;
920 }
921 break;
922 }
923
924 case PIMV2_TYPE_REGISTER_STOP:
925 ND_PRINT(" group=");
926 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
927 goto trunc;
928 bp += advance; len -= advance;
929 ND_PRINT(" source=");
930 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
931 goto trunc;
932 bp += advance; len -= advance;
933 break;
934
935 case PIMV2_TYPE_JOIN_PRUNE:
936 case PIMV2_TYPE_GRAFT:
937 case PIMV2_TYPE_GRAFT_ACK:
938
939
940 /*
941 * 0 1 2 3
942 * 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
943 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
944 * |PIM Ver| Type | Addr length | Checksum |
945 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
946 * | Unicast-Upstream Neighbor Address |
947 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
948 * | Reserved | Num groups | Holdtime |
949 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
950 * | Encoded-Multicast Group Address-1 |
951 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
952 * | Number of Joined Sources | Number of Pruned Sources |
953 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
954 * | Encoded-Joined Source Address-1 |
955 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
956 * | . |
957 * | . |
958 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
959 * | Encoded-Joined Source Address-n |
960 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
961 * | Encoded-Pruned Source Address-1 |
962 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
963 * | . |
964 * | . |
965 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
966 * | Encoded-Pruned Source Address-n |
967 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
968 * | . |
969 * | . |
970 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
971 * | Encoded-Multicast Group Address-n |
972 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
973 */
974
975 {
976 uint8_t ngroup;
977 uint16_t holdtime;
978 uint16_t njoin;
979 uint16_t nprune;
980 u_int i, j;
981
982 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
983 ND_PRINT(", upstream-neighbor: ");
984 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
985 goto trunc;
986 bp += advance; len -= advance;
987 }
988 if (len < 4)
989 goto trunc;
990 ND_TCHECK_4(bp);
991 ngroup = GET_U_1(bp + 1);
992 holdtime = GET_BE_U_2(bp + 2);
993 ND_PRINT("\n\t %u group(s)", ngroup);
994 if (PIM_TYPE(pim_typever) != 7) { /*not for Graft-ACK*/
995 ND_PRINT(", holdtime: ");
996 if (holdtime == 0xffff)
997 ND_PRINT("infinite");
998 else
999 unsigned_relts_print(ndo, holdtime);
1000 }
1001 bp += 4; len -= 4;
1002 for (i = 0; i < ngroup; i++) {
1003 ND_PRINT("\n\t group #%u: ", i+1);
1004 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1005 goto trunc;
1006 bp += advance; len -= advance;
1007 if (len < 4)
1008 goto trunc;
1009 ND_TCHECK_4(bp);
1010 njoin = GET_BE_U_2(bp);
1011 nprune = GET_BE_U_2(bp + 2);
1012 ND_PRINT(", joined sources: %u, pruned sources: %u", njoin, nprune);
1013 bp += 4; len -= 4;
1014 for (j = 0; j < njoin; j++) {
1015 ND_PRINT("\n\t joined source #%u: ", j+1);
1016 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1017 goto trunc;
1018 bp += advance; len -= advance;
1019 }
1020 for (j = 0; j < nprune; j++) {
1021 ND_PRINT("\n\t pruned source #%u: ", j+1);
1022 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_source, pimv2_addr_len, 0)) < 0)
1023 goto trunc;
1024 bp += advance; len -= advance;
1025 }
1026 }
1027 break;
1028 }
1029
1030 case PIMV2_TYPE_BOOTSTRAP:
1031 {
1032 u_int i, j, frpcnt;
1033
1034 /* Fragment Tag, Hash Mask len, and BSR-priority */
1035 if (len < 2)
1036 goto trunc;
1037 ND_PRINT(" tag=%x", GET_BE_U_2(bp));
1038 bp += 2;
1039 len -= 2;
1040 if (len < 1)
1041 goto trunc;
1042 ND_PRINT(" hashmlen=%u", GET_U_1(bp));
1043 if (len < 2)
1044 goto trunc;
1045 ND_TCHECK_1(bp + 2);
1046 ND_PRINT(" BSRprio=%u", GET_U_1(bp + 1));
1047 bp += 2;
1048 len -= 2;
1049
1050 /* Encoded-Unicast-BSR-Address */
1051 ND_PRINT(" BSR=");
1052 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1053 goto trunc;
1054 bp += advance;
1055 len -= advance;
1056
1057 for (i = 0; len > 0; i++) {
1058 /* Encoded-Group Address */
1059 ND_PRINT(" (group%u: ", i);
1060 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1061 goto trunc;
1062 bp += advance;
1063 len -= advance;
1064
1065 /* RP-Count, Frag RP-Cnt, and rsvd */
1066 if (len < 1)
1067 goto trunc;
1068 ND_PRINT(" RPcnt=%u", GET_U_1(bp));
1069 if (len < 2)
1070 goto trunc;
1071 frpcnt = GET_U_1(bp + 1);
1072 ND_PRINT(" FRPcnt=%u", frpcnt);
1073 if (len < 4)
1074 goto trunc;
1075 bp += 4;
1076 len -= 4;
1077
1078 for (j = 0; j < frpcnt && len > 0; j++) {
1079 /* each RP info */
1080 ND_PRINT(" RP%u=", j);
1081 if ((advance = pimv2_addr_print(ndo, bp, len,
1082 pimv2_unicast,
1083 pimv2_addr_len,
1084 0)) < 0)
1085 goto trunc;
1086 bp += advance;
1087 len -= advance;
1088
1089 if (len < 2)
1090 goto trunc;
1091 ND_PRINT(",holdtime=");
1092 unsigned_relts_print(ndo,
1093 GET_BE_U_2(bp));
1094 if (len < 3)
1095 goto trunc;
1096 ND_PRINT(",prio=%u", GET_U_1(bp + 2));
1097 if (len < 4)
1098 goto trunc;
1099 bp += 4;
1100 len -= 4;
1101 }
1102 ND_PRINT(")");
1103 }
1104 break;
1105 }
1106 case PIMV2_TYPE_ASSERT:
1107 ND_PRINT(" group=");
1108 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1109 goto trunc;
1110 bp += advance; len -= advance;
1111 ND_PRINT(" src=");
1112 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1113 goto trunc;
1114 bp += advance; len -= advance;
1115 if (len < 8)
1116 goto trunc;
1117 ND_TCHECK_8(bp);
1118 if (GET_U_1(bp) & 0x80)
1119 ND_PRINT(" RPT");
1120 ND_PRINT(" pref=%u", GET_BE_U_4(bp) & 0x7fffffff);
1121 ND_PRINT(" metric=%u", GET_BE_U_4(bp + 4));
1122 break;
1123
1124 case PIMV2_TYPE_CANDIDATE_RP:
1125 {
1126 u_int i, pfxcnt;
1127
1128 /* Prefix-Cnt, Priority, and Holdtime */
1129 if (len < 1)
1130 goto trunc;
1131 ND_PRINT(" prefix-cnt=%u", GET_U_1(bp));
1132 pfxcnt = GET_U_1(bp);
1133 if (len < 2)
1134 goto trunc;
1135 ND_PRINT(" prio=%u", GET_U_1(bp + 1));
1136 if (len < 4)
1137 goto trunc;
1138 ND_PRINT(" holdtime=");
1139 unsigned_relts_print(ndo, GET_BE_U_2(bp + 2));
1140 bp += 4;
1141 len -= 4;
1142
1143 /* Encoded-Unicast-RP-Address */
1144 ND_PRINT(" RP=");
1145 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1146 goto trunc;
1147 bp += advance;
1148 len -= advance;
1149
1150 /* Encoded-Group Addresses */
1151 for (i = 0; i < pfxcnt && len > 0; i++) {
1152 ND_PRINT(" Group%u=", i);
1153 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1154 goto trunc;
1155 bp += advance;
1156 len -= advance;
1157 }
1158 break;
1159 }
1160
1161 case PIMV2_TYPE_PRUNE_REFRESH:
1162 ND_PRINT(" src=");
1163 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1164 goto trunc;
1165 bp += advance;
1166 len -= advance;
1167 ND_PRINT(" grp=");
1168 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_group, pimv2_addr_len, 0)) < 0)
1169 goto trunc;
1170 bp += advance;
1171 len -= advance;
1172 ND_PRINT(" forwarder=");
1173 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0)
1174 goto trunc;
1175 bp += advance;
1176 len -= advance;
1177 if (len < 2)
1178 goto trunc;
1179 ND_PRINT(" TUNR ");
1180 unsigned_relts_print(ndo, GET_BE_U_2(bp));
1181 break;
1182
1183 case PIMV2_TYPE_DF_ELECTION:
1184 subtype = PIM_SUBTYPE(GET_U_1(pim->pim_rsv));
1185 ND_PRINT("\n\t %s,", tok2str( pimv2_df_election_flag_values,
1186 "Unknown", subtype) );
1187
1188 ND_PRINT(" rpa=");
1189 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1190 goto trunc;
1191 }
1192 bp += advance;
1193 len -= advance;
1194 ND_PRINT(" sender pref=%u", GET_BE_U_4(bp) );
1195 ND_PRINT(" sender metric=%u", GET_BE_U_4(bp + 4));
1196
1197 bp += 8;
1198 len -= 8;
1199
1200 switch (subtype) {
1201 case PIMV2_DF_ELECTION_BACKOFF:
1202 case PIMV2_DF_ELECTION_PASS:
1203 ND_PRINT("\n\t %s addr=", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype));
1204 if ((advance = pimv2_addr_print(ndo, bp, len, pimv2_unicast, pimv2_addr_len, 0)) < 0) {
1205 goto trunc;
1206 }
1207 bp += advance;
1208 len -= advance;
1209
1210 ND_PRINT(" %s pref=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp) );
1211 ND_PRINT(" %s metric=%u", PIMV2_DF_ELECTION_PASS_BACKOFF_STR(subtype), GET_BE_U_4(bp + 4));
1212
1213 bp += 8;
1214 len -= 8;
1215
1216 if (subtype == PIMV2_DF_ELECTION_BACKOFF) {
1217 ND_PRINT(" interval %dms", GET_BE_U_2(bp));
1218 }
1219
1220 break;
1221 default:
1222 break;
1223 }
1224 break;
1225
1226 default:
1227 ND_PRINT(" [type %u]", PIM_TYPE(pim_typever));
1228 break;
1229 }
1230
1231 return;
1232
1233 trunc:
1234 nd_print_trunc(ndo);
1235 }
1236