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