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[tcpdump] / print-pim.c
1 /*
2 * Copyright (c) 1995, 1996
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22 #ifdef HAVE_CONFIG_H
23 #include "config.h"
24 #endif
25
26 #include <tcpdump-stdinc.h>
27
28 #include "netdissect.h"
29 #include "addrtoname.h"
30 #include "extract.h"
31
32 #include "ip.h"
33 #include "ip6.h"
34
35 #define PIMV1_TYPE_QUERY 0
36 #define PIMV1_TYPE_REGISTER 1
37 #define PIMV1_TYPE_REGISTER_STOP 2
38 #define PIMV1_TYPE_JOIN_PRUNE 3
39 #define PIMV1_TYPE_RP_REACHABILITY 4
40 #define PIMV1_TYPE_ASSERT 5
41 #define PIMV1_TYPE_GRAFT 6
42 #define PIMV1_TYPE_GRAFT_ACK 7
43
44 static const struct tok pimv1_type_str[] = {
45 { PIMV1_TYPE_QUERY, "Query" },
46 { PIMV1_TYPE_REGISTER, "Register" },
47 { PIMV1_TYPE_REGISTER_STOP, "Register-Stop" },
48 { PIMV1_TYPE_JOIN_PRUNE, "Join/Prune" },
49 { PIMV1_TYPE_RP_REACHABILITY, "RP-reachable" },
50 { PIMV1_TYPE_ASSERT, "Assert" },
51 { PIMV1_TYPE_GRAFT, "Graft" },
52 { PIMV1_TYPE_GRAFT_ACK, "Graft-ACK" },
53 { 0, NULL }
54 };
55
56 #define PIMV2_TYPE_HELLO 0
57 #define PIMV2_TYPE_REGISTER 1
58 #define PIMV2_TYPE_REGISTER_STOP 2
59 #define PIMV2_TYPE_JOIN_PRUNE 3
60 #define PIMV2_TYPE_BOOTSTRAP 4
61 #define PIMV2_TYPE_ASSERT 5
62 #define PIMV2_TYPE_GRAFT 6
63 #define PIMV2_TYPE_GRAFT_ACK 7
64 #define PIMV2_TYPE_CANDIDATE_RP 8
65 #define PIMV2_TYPE_PRUNE_REFRESH 9
66 #define PIMV2_TYPE_DF_ELECTION 10
67 #define PIMV2_TYPE_ECMP_REDIRECT 11
68
69 static const struct tok pimv2_type_values[] = {
70 { PIMV2_TYPE_HELLO, "Hello" },
71 { PIMV2_TYPE_REGISTER, "Register" },
72 { PIMV2_TYPE_REGISTER_STOP, "Register Stop" },
73 { PIMV2_TYPE_JOIN_PRUNE, "Join / Prune" },
74 { PIMV2_TYPE_BOOTSTRAP, "Bootstrap" },
75 { PIMV2_TYPE_ASSERT, "Assert" },
76 { PIMV2_TYPE_GRAFT, "Graft" },
77 { PIMV2_TYPE_GRAFT_ACK, "Graft Acknowledgement" },
78 { PIMV2_TYPE_CANDIDATE_RP, "Candidate RP Advertisement" },
79 { PIMV2_TYPE_PRUNE_REFRESH, "Prune Refresh" },
80 { PIMV2_TYPE_DF_ELECTION, "DF Election" },
81 { PIMV2_TYPE_ECMP_REDIRECT, "ECMP Redirect" },
82 { 0, NULL}
83 };
84
85 #define PIMV2_HELLO_OPTION_HOLDTIME 1
86 #define PIMV2_HELLO_OPTION_LANPRUNEDELAY 2
87 #define PIMV2_HELLO_OPTION_DR_PRIORITY_OLD 18
88 #define PIMV2_HELLO_OPTION_DR_PRIORITY 19
89 #define PIMV2_HELLO_OPTION_GENID 20
90 #define PIMV2_HELLO_OPTION_REFRESH_CAP 21
91 #define PIMV2_HELLO_OPTION_BIDIR_CAP 22
92 #define PIMV2_HELLO_OPTION_ADDRESS_LIST 24
93 #define PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD 65001
94
95 static const struct tok pimv2_hello_option_values[] = {
96 { PIMV2_HELLO_OPTION_HOLDTIME, "Hold Time" },
97 { PIMV2_HELLO_OPTION_LANPRUNEDELAY, "LAN Prune Delay" },
98 { PIMV2_HELLO_OPTION_DR_PRIORITY_OLD, "DR Priority (Old)" },
99 { PIMV2_HELLO_OPTION_DR_PRIORITY, "DR Priority" },
100 { PIMV2_HELLO_OPTION_GENID, "Generation ID" },
101 { PIMV2_HELLO_OPTION_REFRESH_CAP, "State Refresh Capability" },
102 { PIMV2_HELLO_OPTION_BIDIR_CAP, "Bi-Directional Capability" },
103 { PIMV2_HELLO_OPTION_ADDRESS_LIST, "Address List" },
104 { PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD, "Address List (Old)" },
105 { 0, NULL}
106 };
107
108 #define PIMV2_REGISTER_FLAG_LEN 4
109 #define PIMV2_REGISTER_FLAG_BORDER 0x80000000
110 #define PIMV2_REGISTER_FLAG_NULL 0x40000000
111
112 static const struct tok pimv2_register_flag_values[] = {
113 { PIMV2_REGISTER_FLAG_BORDER, "Border" },
114 { PIMV2_REGISTER_FLAG_NULL, "Null" },
115 { 0, NULL}
116 };
117
118 /*
119 * XXX: We consider a case where IPv6 is not ready yet for portability,
120 * but PIM dependent defintions should be independent of IPv6...
121 */
122
123 struct pim {
124 uint8_t pim_typever;
125 /* upper 4bit: PIM version number; 2 for PIMv2 */
126 /* lower 4bit: the PIM message type, currently they are:
127 * Hello, Register, Register-Stop, Join/Prune,
128 * Bootstrap, Assert, Graft (PIM-DM only),
129 * Graft-Ack (PIM-DM only), C-RP-Adv
130 */
131 #define PIM_VER(x) (((x) & 0xf0) >> 4)
132 #define PIM_TYPE(x) ((x) & 0x0f)
133 u_char pim_rsv; /* Reserved */
134 u_short pim_cksum; /* IP style check sum */
135 };
136
137 static void pimv2_print(netdissect_options *, register const u_char *bp, register u_int len, const u_char *);
138
139 static void
140 pimv1_join_prune_print(netdissect_options *ndo,
141 register const u_char *bp, register u_int len)
142 {
143 int ngroups, njoin, nprune;
144 int njp;
145
146 /* If it's a single group and a single source, use 1-line output. */
147 if (ND_TTEST2(bp[0], 30) && bp[11] == 1 &&
148 ((njoin = EXTRACT_16BITS(&bp[20])) + EXTRACT_16BITS(&bp[22])) == 1) {
149 int hold;
150
151 ND_PRINT((ndo, " RPF %s ", ipaddr_string(ndo, bp)));
152 hold = EXTRACT_16BITS(&bp[6]);
153 if (hold != 180) {
154 ND_PRINT((ndo, "Hold "));
155 relts_print(ndo, hold);
156 }
157 ND_PRINT((ndo, "%s (%s/%d, %s", njoin ? "Join" : "Prune",
158 ipaddr_string(ndo, &bp[26]), bp[25] & 0x3f,
159 ipaddr_string(ndo, &bp[12])));
160 if (EXTRACT_32BITS(&bp[16]) != 0xffffffff)
161 ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[16])));
162 ND_PRINT((ndo, ") %s%s %s",
163 (bp[24] & 0x01) ? "Sparse" : "Dense",
164 (bp[25] & 0x80) ? " WC" : "",
165 (bp[25] & 0x40) ? "RP" : "SPT"));
166 return;
167 }
168
169 ND_TCHECK2(bp[0], sizeof(struct in_addr));
170 if (ndo->ndo_vflag > 1)
171 ND_PRINT((ndo, "\n"));
172 ND_PRINT((ndo, " Upstream Nbr: %s", ipaddr_string(ndo, bp)));
173 ND_TCHECK2(bp[6], 2);
174 if (ndo->ndo_vflag > 1)
175 ND_PRINT((ndo, "\n"));
176 ND_PRINT((ndo, " Hold time: "));
177 relts_print(ndo, EXTRACT_16BITS(&bp[6]));
178 if (ndo->ndo_vflag < 2)
179 return;
180 bp += 8;
181 len -= 8;
182
183 ND_TCHECK2(bp[0], 4);
184 ngroups = bp[3];
185 bp += 4;
186 len -= 4;
187 while (ngroups--) {
188 /*
189 * XXX - does the address have length "addrlen" and the
190 * mask length "maddrlen"?
191 */
192 ND_TCHECK2(bp[0], sizeof(struct in_addr));
193 ND_PRINT((ndo, "\n\tGroup: %s", ipaddr_string(ndo, bp)));
194 ND_TCHECK2(bp[4], sizeof(struct in_addr));
195 if (EXTRACT_32BITS(&bp[4]) != 0xffffffff)
196 ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[4])));
197 ND_TCHECK2(bp[8], 4);
198 njoin = EXTRACT_16BITS(&bp[8]);
199 nprune = EXTRACT_16BITS(&bp[10]);
200 ND_PRINT((ndo, " joined: %d pruned: %d", njoin, nprune));
201 bp += 12;
202 len -= 12;
203 for (njp = 0; njp < (njoin + nprune); njp++) {
204 const char *type;
205
206 if (njp < njoin)
207 type = "Join ";
208 else
209 type = "Prune";
210 ND_TCHECK2(bp[0], 6);
211 ND_PRINT((ndo, "\n\t%s %s%s%s%s/%d", type,
212 (bp[0] & 0x01) ? "Sparse " : "Dense ",
213 (bp[1] & 0x80) ? "WC " : "",
214 (bp[1] & 0x40) ? "RP " : "SPT ",
215 ipaddr_string(ndo, &bp[2]), bp[1] & 0x3f));
216 bp += 6;
217 len -= 6;
218 }
219 }
220 return;
221 trunc:
222 ND_PRINT((ndo, "[|pim]"));
223 return;
224 }
225
226 void
227 pimv1_print(netdissect_options *ndo,
228 register const u_char *bp, register u_int len)
229 {
230 register const u_char *ep;
231 register u_char type;
232
233 ep = (const u_char *)ndo->ndo_snapend;
234 if (bp >= ep)
235 return;
236
237 ND_TCHECK(bp[1]);
238 type = bp[1];
239
240 ND_PRINT((ndo, " %s", tok2str(pimv1_type_str, "[type %u]", type)));
241 switch (type) {
242 case PIMV1_TYPE_QUERY:
243 if (ND_TTEST(bp[8])) {
244 switch (bp[8] >> 4) {
245 case 0:
246 ND_PRINT((ndo, " Dense-mode"));
247 break;
248 case 1:
249 ND_PRINT((ndo, " Sparse-mode"));
250 break;
251 case 2:
252 ND_PRINT((ndo, " Sparse-Dense-mode"));
253 break;
254 default:
255 ND_PRINT((ndo, " mode-%d", bp[8] >> 4));
256 break;
257 }
258 }
259 if (ndo->ndo_vflag) {
260 ND_TCHECK2(bp[10],2);
261 ND_PRINT((ndo, " (Hold-time "));
262 relts_print(ndo, EXTRACT_16BITS(&bp[10]));
263 ND_PRINT((ndo, ")"));
264 }
265 break;
266
267 case PIMV1_TYPE_REGISTER:
268 ND_TCHECK2(bp[8], 20); /* ip header */
269 ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[20]),
270 ipaddr_string(ndo, &bp[24])));
271 break;
272 case PIMV1_TYPE_REGISTER_STOP:
273 ND_TCHECK2(bp[12], sizeof(struct in_addr));
274 ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[8]),
275 ipaddr_string(ndo, &bp[12])));
276 break;
277 case PIMV1_TYPE_RP_REACHABILITY:
278 if (ndo->ndo_vflag) {
279 ND_TCHECK2(bp[22], 2);
280 ND_PRINT((ndo, " group %s", ipaddr_string(ndo, &bp[8])));
281 if (EXTRACT_32BITS(&bp[12]) != 0xffffffff)
282 ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[12])));
283 ND_PRINT((ndo, " RP %s hold ", ipaddr_string(ndo, &bp[16])));
284 relts_print(ndo, EXTRACT_16BITS(&bp[22]));
285 }
286 break;
287 case PIMV1_TYPE_ASSERT:
288 ND_TCHECK2(bp[16], sizeof(struct in_addr));
289 ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[16]),
290 ipaddr_string(ndo, &bp[8])));
291 if (EXTRACT_32BITS(&bp[12]) != 0xffffffff)
292 ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[12])));
293 ND_TCHECK2(bp[24], 4);
294 ND_PRINT((ndo, " %s pref %d metric %d",
295 (bp[20] & 0x80) ? "RP-tree" : "SPT",
296 EXTRACT_32BITS(&bp[20]) & 0x7fffffff,
297 EXTRACT_32BITS(&bp[24])));
298 break;
299 case PIMV1_TYPE_JOIN_PRUNE:
300 case PIMV1_TYPE_GRAFT:
301 case PIMV1_TYPE_GRAFT_ACK:
302 if (ndo->ndo_vflag)
303 pimv1_join_prune_print(ndo, &bp[8], len - 8);
304 break;
305 }
306 if ((bp[4] >> 4) != 1)
307 ND_PRINT((ndo, " [v%d]", bp[4] >> 4));
308 return;
309
310 trunc:
311 ND_PRINT((ndo, "[|pim]"));
312 return;
313 }
314
315 /*
316 * auto-RP is a cisco protocol, documented at
317 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
318 *
319 * This implements version 1+, dated Sept 9, 1998.
320 */
321 void
322 cisco_autorp_print(netdissect_options *ndo,
323 register const u_char *bp, register u_int len)
324 {
325 int type;
326 int numrps;
327 int hold;
328
329 ND_TCHECK(bp[0]);
330 ND_PRINT((ndo, " auto-rp "));
331 type = bp[0];
332 switch (type) {
333 case 0x11:
334 ND_PRINT((ndo, "candidate-advert"));
335 break;
336 case 0x12:
337 ND_PRINT((ndo, "mapping"));
338 break;
339 default:
340 ND_PRINT((ndo, "type-0x%02x", type));
341 break;
342 }
343
344 ND_TCHECK(bp[1]);
345 numrps = bp[1];
346
347 ND_TCHECK2(bp[2], 2);
348 ND_PRINT((ndo, " Hold "));
349 hold = EXTRACT_16BITS(&bp[2]);
350 if (hold)
351 relts_print(ndo, EXTRACT_16BITS(&bp[2]));
352 else
353 ND_PRINT((ndo, "FOREVER"));
354
355 /* Next 4 bytes are reserved. */
356
357 bp += 8; len -= 8;
358
359 /*XXX skip unless -v? */
360
361 /*
362 * Rest of packet:
363 * numrps entries of the form:
364 * 32 bits: RP
365 * 6 bits: reserved
366 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
367 * 8 bits: # of entries for this RP
368 * each entry: 7 bits: reserved, 1 bit: negative,
369 * 8 bits: mask 32 bits: source
370 * lather, rinse, repeat.
371 */
372 while (numrps--) {
373 int nentries;
374 char s;
375
376 ND_TCHECK2(bp[0], 4);
377 ND_PRINT((ndo, " RP %s", ipaddr_string(ndo, bp)));
378 ND_TCHECK(bp[4]);
379 switch (bp[4] & 0x3) {
380 case 0: ND_PRINT((ndo, " PIMv?"));
381 break;
382 case 1: ND_PRINT((ndo, " PIMv1"));
383 break;
384 case 2: ND_PRINT((ndo, " PIMv2"));
385 break;
386 case 3: ND_PRINT((ndo, " PIMv1+2"));
387 break;
388 }
389 if (bp[4] & 0xfc)
390 ND_PRINT((ndo, " [rsvd=0x%02x]", bp[4] & 0xfc));
391 ND_TCHECK(bp[5]);
392 nentries = bp[5];
393 bp += 6; len -= 6;
394 s = ' ';
395 for (; nentries; nentries--) {
396 ND_TCHECK2(bp[0], 6);
397 ND_PRINT((ndo, "%c%s%s/%d", s, bp[0] & 1 ? "!" : "",
398 ipaddr_string(ndo, &bp[2]), bp[1]));
399 if (bp[0] & 0x02) {
400 ND_PRINT((ndo, " bidir"));
401 }
402 if (bp[0] & 0xfc) {
403 ND_PRINT((ndo, "[rsvd=0x%02x]", bp[0] & 0xfc));
404 }
405 s = ',';
406 bp += 6; len -= 6;
407 }
408 }
409 return;
410
411 trunc:
412 ND_PRINT((ndo, "[|autorp]"));
413 return;
414 }
415
416 void
417 pim_print(netdissect_options *ndo,
418 register const u_char *bp, register u_int len, const u_char *bp2)
419 {
420 register const u_char *ep;
421 register const struct pim *pim = (const struct pim *)bp;
422
423 ep = (const u_char *)ndo->ndo_snapend;
424 if (bp >= ep)
425 return;
426 #ifdef notyet /* currently we see only version and type */
427 ND_TCHECK(pim->pim_rsv);
428 #endif
429
430 switch (PIM_VER(pim->pim_typever)) {
431 case 2:
432 if (!ndo->ndo_vflag) {
433 ND_PRINT((ndo, "PIMv%u, %s, length %u",
434 PIM_VER(pim->pim_typever),
435 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim->pim_typever)),
436 len));
437 return;
438 } else {
439 ND_PRINT((ndo, "PIMv%u, length %u\n\t%s",
440 PIM_VER(pim->pim_typever),
441 len,
442 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim->pim_typever))));
443 pimv2_print(ndo, bp, len, bp2);
444 }
445 break;
446 default:
447 ND_PRINT((ndo, "PIMv%u, length %u",
448 PIM_VER(pim->pim_typever),
449 len));
450 break;
451 }
452 return;
453 }
454
455 /*
456 * PIMv2 uses encoded address representations.
457 *
458 * The last PIM-SM I-D before RFC2117 was published specified the
459 * following representation for unicast addresses. However, RFC2117
460 * specified no encoding for unicast addresses with the unicast
461 * address length specified in the header. Therefore, we have to
462 * guess which encoding is being used (Cisco's PIMv2 implementation
463 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
464 * field into a 'unicast-address-length-in-bytes' field. We guess
465 * that it's the draft encoding if this reserved field is zero.
466 *
467 * RFC2362 goes back to the encoded format, and calls the addr length
468 * field "reserved" again.
469 *
470 * The first byte is the address family, from:
471 *
472 * 0 Reserved
473 * 1 IP (IP version 4)
474 * 2 IP6 (IP version 6)
475 * 3 NSAP
476 * 4 HDLC (8-bit multidrop)
477 * 5 BBN 1822
478 * 6 802 (includes all 802 media plus Ethernet "canonical format")
479 * 7 E.163
480 * 8 E.164 (SMDS, Frame Relay, ATM)
481 * 9 F.69 (Telex)
482 * 10 X.121 (X.25, Frame Relay)
483 * 11 IPX
484 * 12 Appletalk
485 * 13 Decnet IV
486 * 14 Banyan Vines
487 * 15 E.164 with NSAP format subaddress
488 *
489 * In addition, the second byte is an "Encoding". 0 is the default
490 * encoding for the address family, and no other encodings are currently
491 * specified.
492 *
493 */
494
495 static int pimv2_addr_len;
496
497 enum pimv2_addrtype {
498 pimv2_unicast, pimv2_group, pimv2_source
499 };
500
501 /* 0 1 2 3
502 * 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
503 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
504 * | Addr Family | Encoding Type | Unicast Address |
505 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
506 * 0 1 2 3
507 * 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
508 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
509 * | Addr Family | Encoding Type | Reserved | Mask Len |
510 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
511 * | Group multicast Address |
512 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
513 * 0 1 2 3
514 * 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
515 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
516 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
517 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
518 * | Source Address |
519 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
520 */
521 static int
522 pimv2_addr_print(netdissect_options *ndo,
523 const u_char *bp, enum pimv2_addrtype at, int silent)
524 {
525 int af;
526 int len, hdrlen;
527
528 ND_TCHECK(bp[0]);
529
530 if (pimv2_addr_len == 0) {
531 ND_TCHECK(bp[1]);
532 switch (bp[0]) {
533 case 1:
534 af = AF_INET;
535 len = sizeof(struct in_addr);
536 break;
537 #ifdef INET6
538 case 2:
539 af = AF_INET6;
540 len = sizeof(struct in6_addr);
541 break;
542 #endif
543 default:
544 return -1;
545 }
546 if (bp[1] != 0)
547 return -1;
548 hdrlen = 2;
549 } else {
550 switch (pimv2_addr_len) {
551 case sizeof(struct in_addr):
552 af = AF_INET;
553 break;
554 #ifdef INET6
555 case sizeof(struct in6_addr):
556 af = AF_INET6;
557 break;
558 #endif
559 default:
560 return -1;
561 break;
562 }
563 len = pimv2_addr_len;
564 hdrlen = 0;
565 }
566
567 bp += hdrlen;
568 switch (at) {
569 case pimv2_unicast:
570 ND_TCHECK2(bp[0], len);
571 if (af == AF_INET) {
572 if (!silent)
573 ND_PRINT((ndo, "%s", ipaddr_string(ndo, bp)));
574 }
575 #ifdef INET6
576 else if (af == AF_INET6) {
577 if (!silent)
578 ND_PRINT((ndo, "%s", ip6addr_string(ndo, bp)));
579 }
580 #endif
581 return hdrlen + len;
582 case pimv2_group:
583 case pimv2_source:
584 ND_TCHECK2(bp[0], len + 2);
585 if (af == AF_INET) {
586 if (!silent) {
587 ND_PRINT((ndo, "%s", ipaddr_string(ndo, bp + 2)));
588 if (bp[1] != 32)
589 ND_PRINT((ndo, "/%u", bp[1]));
590 }
591 }
592 #ifdef INET6
593 else if (af == AF_INET6) {
594 if (!silent) {
595 ND_PRINT((ndo, "%s", ip6addr_string(ndo, bp + 2)));
596 if (bp[1] != 128)
597 ND_PRINT((ndo, "/%u", bp[1]));
598 }
599 }
600 #endif
601 if (bp[0] && !silent) {
602 if (at == pimv2_group) {
603 ND_PRINT((ndo, "(0x%02x)", bp[0]));
604 } else {
605 ND_PRINT((ndo, "(%s%s%s",
606 bp[0] & 0x04 ? "S" : "",
607 bp[0] & 0x02 ? "W" : "",
608 bp[0] & 0x01 ? "R" : ""));
609 if (bp[0] & 0xf8) {
610 ND_PRINT((ndo, "+0x%02x", bp[0] & 0xf8));
611 }
612 ND_PRINT((ndo, ")"));
613 }
614 }
615 return hdrlen + 2 + len;
616 default:
617 return -1;
618 }
619 trunc:
620 return -1;
621 }
622
623 enum checksum_status {
624 CORRECT,
625 INCORRECT,
626 UNVERIFIED
627 };
628
629 static enum checksum_status
630 pimv2_check_checksum(const u_char *bp, const u_char *bp2, u_int len)
631 {
632 const struct ip *ip;
633 u_int cksum;
634
635 ip = (const struct ip *)bp2;
636 if (IP_V(ip) == 4) {
637 struct cksum_vec vec[1];
638
639 vec[0].ptr = bp;
640 vec[0].len = len;
641 cksum = in_cksum(vec, 1);
642 return (cksum ? INCORRECT : CORRECT);
643 #ifdef INET6
644 } else if (IP_V(ip) == 6) {
645 const struct ip6_hdr *ip6;
646
647 ip6 = (const struct ip6_hdr *)bp2;
648 cksum = nextproto6_cksum(ip6, bp, len, len, IPPROTO_PIM);
649 return (cksum ? INCORRECT : CORRECT);
650 #endif
651 } else {
652 return (UNVERIFIED);
653 }
654 }
655
656 static void
657 pimv2_print(netdissect_options *ndo,
658 register const u_char *bp, register u_int len, const u_char *bp2)
659 {
660 register const u_char *ep;
661 register const struct pim *pim = (const struct pim *)bp;
662 int advance;
663 enum checksum_status cksum_status;
664
665 ep = (const u_char *)ndo->ndo_snapend;
666 if (bp >= ep)
667 return;
668 if (ep > bp + len)
669 ep = bp + len;
670 ND_TCHECK(pim->pim_rsv);
671 pimv2_addr_len = pim->pim_rsv;
672 if (pimv2_addr_len != 0)
673 ND_PRINT((ndo, ", RFC2117-encoding"));
674
675 ND_PRINT((ndo, ", cksum 0x%04x ", EXTRACT_16BITS(&pim->pim_cksum)));
676 if (EXTRACT_16BITS(&pim->pim_cksum) == 0) {
677 ND_PRINT((ndo, "(unverified)"));
678 } else {
679 if (PIM_TYPE(pim->pim_typever) == PIMV2_TYPE_REGISTER) {
680 /*
681 * The checksum only covers the packet header,
682 * not the encapsulated packet.
683 */
684 cksum_status = pimv2_check_checksum(bp, bp2, 8);
685 if (cksum_status == INCORRECT) {
686 /*
687 * To quote RFC 4601, "For interoperability
688 * reasons, a message carrying a checksum
689 * calculated over the entire PIM Register
690 * message should also be accepted."
691 */
692 cksum_status = pimv2_check_checksum(bp, bp2, len);
693 }
694 } else {
695 /*
696 * The checksum covers the entire packet.
697 */
698 cksum_status = pimv2_check_checksum(bp, bp2, len);
699 }
700 switch (cksum_status) {
701
702 case CORRECT:
703 ND_PRINT((ndo, "(correct)"));
704 break;
705
706 case INCORRECT:
707 ND_PRINT((ndo, "(incorrect)"));
708 break;
709
710 case UNVERIFIED:
711 ND_PRINT((ndo, "(unverified)"));
712 break;
713 }
714 }
715
716 switch (PIM_TYPE(pim->pim_typever)) {
717 case PIMV2_TYPE_HELLO:
718 {
719 uint16_t otype, olen;
720 bp += 4;
721 while (bp < ep) {
722 ND_TCHECK2(bp[0], 4);
723 otype = EXTRACT_16BITS(&bp[0]);
724 olen = EXTRACT_16BITS(&bp[2]);
725 ND_TCHECK2(bp[0], 4 + olen);
726 ND_PRINT((ndo, "\n\t %s Option (%u), length %u, Value: ",
727 tok2str(pimv2_hello_option_values, "Unknown", otype),
728 otype,
729 olen));
730 bp += 4;
731
732 switch (otype) {
733 case PIMV2_HELLO_OPTION_HOLDTIME:
734 relts_print(ndo, EXTRACT_16BITS(bp));
735 break;
736
737 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
738 if (olen != 4) {
739 ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
740 } else {
741 char t_bit;
742 uint16_t lan_delay, override_interval;
743 lan_delay = EXTRACT_16BITS(bp);
744 override_interval = EXTRACT_16BITS(bp+2);
745 t_bit = (lan_delay & 0x8000)? 1 : 0;
746 lan_delay &= ~0x8000;
747 ND_PRINT((ndo, "\n\t T-bit=%d, LAN delay %dms, Override interval %dms",
748 t_bit, lan_delay, override_interval));
749 }
750 break;
751
752 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
753 case PIMV2_HELLO_OPTION_DR_PRIORITY:
754 switch (olen) {
755 case 0:
756 ND_PRINT((ndo, "Bi-Directional Capability (Old)"));
757 break;
758 case 4:
759 ND_PRINT((ndo, "%u", EXTRACT_32BITS(bp)));
760 break;
761 default:
762 ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
763 break;
764 }
765 break;
766
767 case PIMV2_HELLO_OPTION_GENID:
768 ND_PRINT((ndo, "0x%08x", EXTRACT_32BITS(bp)));
769 break;
770
771 case PIMV2_HELLO_OPTION_REFRESH_CAP:
772 ND_PRINT((ndo, "v%d", *bp));
773 if (*(bp+1) != 0) {
774 ND_PRINT((ndo, ", interval "));
775 relts_print(ndo, *(bp+1));
776 }
777 if (EXTRACT_16BITS(bp+2) != 0) {
778 ND_PRINT((ndo, " ?0x%04x?", EXTRACT_16BITS(bp+2)));
779 }
780 break;
781
782 case PIMV2_HELLO_OPTION_BIDIR_CAP:
783 break;
784
785 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
786 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
787 if (ndo->ndo_vflag > 1) {
788 const u_char *ptr = bp;
789 while (ptr < (bp+olen)) {
790 ND_PRINT((ndo, "\n\t "));
791 advance = pimv2_addr_print(ndo, ptr, pimv2_unicast, 0);
792 if (advance < 0) {
793 ND_PRINT((ndo, "..."));
794 break;
795 }
796 ptr += advance;
797 }
798 }
799 break;
800 default:
801 if (ndo->ndo_vflag <= 1)
802 print_unknown_data(ndo, bp, "\n\t ", olen);
803 break;
804 }
805 /* do we want to see an additionally hexdump ? */
806 if (ndo->ndo_vflag> 1)
807 print_unknown_data(ndo, bp, "\n\t ", olen);
808 bp += olen;
809 }
810 break;
811 }
812
813 case PIMV2_TYPE_REGISTER:
814 {
815 const struct ip *ip;
816
817 ND_TCHECK2(*(bp + 4), PIMV2_REGISTER_FLAG_LEN);
818
819 ND_PRINT((ndo, ", Flags [ %s ]\n\t",
820 tok2str(pimv2_register_flag_values,
821 "none",
822 EXTRACT_32BITS(bp+4))));
823
824 bp += 8; len -= 8;
825 /* encapsulated multicast packet */
826 ip = (const struct ip *)bp;
827 switch (IP_V(ip)) {
828 case 0: /* Null header */
829 ND_PRINT((ndo, "IP-Null-header %s > %s",
830 ipaddr_string(ndo, &ip->ip_src),
831 ipaddr_string(ndo, &ip->ip_dst)));
832 break;
833
834 case 4: /* IPv4 */
835 ip_print(ndo, bp, len);
836 break;
837
838 case 6: /* IPv6 */
839 ip6_print(ndo, bp, len);
840 break;
841
842 default:
843 ND_PRINT((ndo, "IP ver %d", IP_V(ip)));
844 break;
845 }
846 break;
847 }
848
849 case PIMV2_TYPE_REGISTER_STOP:
850 bp += 4; len -= 4;
851 if (bp >= ep)
852 break;
853 ND_PRINT((ndo, " group="));
854 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0)) < 0) {
855 ND_PRINT((ndo, "..."));
856 break;
857 }
858 bp += advance; len -= advance;
859 if (bp >= ep)
860 break;
861 ND_PRINT((ndo, " source="));
862 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
863 ND_PRINT((ndo, "..."));
864 break;
865 }
866 bp += advance; len -= advance;
867 break;
868
869 case PIMV2_TYPE_JOIN_PRUNE:
870 case PIMV2_TYPE_GRAFT:
871 case PIMV2_TYPE_GRAFT_ACK:
872
873
874 /*
875 * 0 1 2 3
876 * 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
877 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
878 * |PIM Ver| Type | Addr length | Checksum |
879 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
880 * | Unicast-Upstream Neighbor Address |
881 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
882 * | Reserved | Num groups | Holdtime |
883 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
884 * | Encoded-Multicast Group Address-1 |
885 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
886 * | Number of Joined Sources | Number of Pruned Sources |
887 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
888 * | Encoded-Joined Source Address-1 |
889 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
890 * | . |
891 * | . |
892 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
893 * | Encoded-Joined Source Address-n |
894 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
895 * | Encoded-Pruned Source Address-1 |
896 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
897 * | . |
898 * | . |
899 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
900 * | Encoded-Pruned Source Address-n |
901 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
902 * | . |
903 * | . |
904 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
905 * | Encoded-Multicast Group Address-n |
906 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
907 */
908
909 {
910 uint8_t ngroup;
911 uint16_t holdtime;
912 uint16_t njoin;
913 uint16_t nprune;
914 int i, j;
915
916 bp += 4; len -= 4;
917 if (PIM_TYPE(pim->pim_typever) != 7) { /*not for Graft-ACK*/
918 if (bp >= ep)
919 break;
920 ND_PRINT((ndo, ", upstream-neighbor: "));
921 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
922 ND_PRINT((ndo, "..."));
923 break;
924 }
925 bp += advance; len -= advance;
926 }
927 if (bp + 4 > ep)
928 break;
929 ngroup = bp[1];
930 holdtime = EXTRACT_16BITS(&bp[2]);
931 ND_PRINT((ndo, "\n\t %u group(s)", ngroup));
932 if (PIM_TYPE(pim->pim_typever) != 7) { /*not for Graft-ACK*/
933 ND_PRINT((ndo, ", holdtime: "));
934 if (holdtime == 0xffff)
935 ND_PRINT((ndo, "infinite"));
936 else
937 relts_print(ndo, holdtime);
938 }
939 bp += 4; len -= 4;
940 for (i = 0; i < ngroup; i++) {
941 if (bp >= ep)
942 goto jp_done;
943 ND_PRINT((ndo, "\n\t group #%u: ", i+1));
944 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0)) < 0) {
945 ND_PRINT((ndo, "...)"));
946 goto jp_done;
947 }
948 bp += advance; len -= advance;
949 if (bp + 4 > ep) {
950 ND_PRINT((ndo, "...)"));
951 goto jp_done;
952 }
953 njoin = EXTRACT_16BITS(&bp[0]);
954 nprune = EXTRACT_16BITS(&bp[2]);
955 ND_PRINT((ndo, ", joined sources: %u, pruned sources: %u", njoin, nprune));
956 bp += 4; len -= 4;
957 for (j = 0; j < njoin; j++) {
958 ND_PRINT((ndo, "\n\t joined source #%u: ", j+1));
959 if ((advance = pimv2_addr_print(ndo, bp, pimv2_source, 0)) < 0) {
960 ND_PRINT((ndo, "...)"));
961 goto jp_done;
962 }
963 bp += advance; len -= advance;
964 }
965 for (j = 0; j < nprune; j++) {
966 ND_PRINT((ndo, "\n\t pruned source #%u: ", j+1));
967 if ((advance = pimv2_addr_print(ndo, bp, pimv2_source, 0)) < 0) {
968 ND_PRINT((ndo, "...)"));
969 goto jp_done;
970 }
971 bp += advance; len -= advance;
972 }
973 }
974 jp_done:
975 break;
976 }
977
978 case PIMV2_TYPE_BOOTSTRAP:
979 {
980 int i, j, frpcnt;
981 bp += 4;
982
983 /* Fragment Tag, Hash Mask len, and BSR-priority */
984 if (bp + sizeof(uint16_t) >= ep) break;
985 ND_PRINT((ndo, " tag=%x", EXTRACT_16BITS(bp)));
986 bp += sizeof(uint16_t);
987 if (bp >= ep) break;
988 ND_PRINT((ndo, " hashmlen=%d", bp[0]));
989 if (bp + 1 >= ep) break;
990 ND_PRINT((ndo, " BSRprio=%d", bp[1]));
991 bp += 2;
992
993 /* Encoded-Unicast-BSR-Address */
994 if (bp >= ep) break;
995 ND_PRINT((ndo, " BSR="));
996 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
997 ND_PRINT((ndo, "..."));
998 break;
999 }
1000 bp += advance;
1001
1002 for (i = 0; bp < ep; i++) {
1003 /* Encoded-Group Address */
1004 ND_PRINT((ndo, " (group%d: ", i));
1005 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0))
1006 < 0) {
1007 ND_PRINT((ndo, "...)"));
1008 goto bs_done;
1009 }
1010 bp += advance;
1011
1012 /* RP-Count, Frag RP-Cnt, and rsvd */
1013 if (bp >= ep) {
1014 ND_PRINT((ndo, "...)"));
1015 goto bs_done;
1016 }
1017 ND_PRINT((ndo, " RPcnt=%d", bp[0]));
1018 if (bp + 1 >= ep) {
1019 ND_PRINT((ndo, "...)"));
1020 goto bs_done;
1021 }
1022 ND_PRINT((ndo, " FRPcnt=%d", frpcnt = bp[1]));
1023 bp += 4;
1024
1025 for (j = 0; j < frpcnt && bp < ep; j++) {
1026 /* each RP info */
1027 ND_PRINT((ndo, " RP%d=", j));
1028 if ((advance = pimv2_addr_print(ndo, bp,
1029 pimv2_unicast,
1030 0)) < 0) {
1031 ND_PRINT((ndo, "...)"));
1032 goto bs_done;
1033 }
1034 bp += advance;
1035
1036 if (bp + 1 >= ep) {
1037 ND_PRINT((ndo, "...)"));
1038 goto bs_done;
1039 }
1040 ND_PRINT((ndo, ",holdtime="));
1041 relts_print(ndo, EXTRACT_16BITS(bp));
1042 if (bp + 2 >= ep) {
1043 ND_PRINT((ndo, "...)"));
1044 goto bs_done;
1045 }
1046 ND_PRINT((ndo, ",prio=%d", bp[2]));
1047 bp += 4;
1048 }
1049 ND_PRINT((ndo, ")"));
1050 }
1051 bs_done:
1052 break;
1053 }
1054 case PIMV2_TYPE_ASSERT:
1055 bp += 4; len -= 4;
1056 if (bp >= ep)
1057 break;
1058 ND_PRINT((ndo, " group="));
1059 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0)) < 0) {
1060 ND_PRINT((ndo, "..."));
1061 break;
1062 }
1063 bp += advance; len -= advance;
1064 if (bp >= ep)
1065 break;
1066 ND_PRINT((ndo, " src="));
1067 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
1068 ND_PRINT((ndo, "..."));
1069 break;
1070 }
1071 bp += advance; len -= advance;
1072 if (bp + 8 > ep)
1073 break;
1074 if (bp[0] & 0x80)
1075 ND_PRINT((ndo, " RPT"));
1076 ND_PRINT((ndo, " pref=%u", EXTRACT_32BITS(&bp[0]) & 0x7fffffff));
1077 ND_PRINT((ndo, " metric=%u", EXTRACT_32BITS(&bp[4])));
1078 break;
1079
1080 case PIMV2_TYPE_CANDIDATE_RP:
1081 {
1082 int i, pfxcnt;
1083 bp += 4;
1084
1085 /* Prefix-Cnt, Priority, and Holdtime */
1086 if (bp >= ep) break;
1087 ND_PRINT((ndo, " prefix-cnt=%d", bp[0]));
1088 pfxcnt = bp[0];
1089 if (bp + 1 >= ep) break;
1090 ND_PRINT((ndo, " prio=%d", bp[1]));
1091 if (bp + 3 >= ep) break;
1092 ND_PRINT((ndo, " holdtime="));
1093 relts_print(ndo, EXTRACT_16BITS(&bp[2]));
1094 bp += 4;
1095
1096 /* Encoded-Unicast-RP-Address */
1097 if (bp >= ep) break;
1098 ND_PRINT((ndo, " RP="));
1099 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
1100 ND_PRINT((ndo, "..."));
1101 break;
1102 }
1103 bp += advance;
1104
1105 /* Encoded-Group Addresses */
1106 for (i = 0; i < pfxcnt && bp < ep; i++) {
1107 ND_PRINT((ndo, " Group%d=", i));
1108 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0))
1109 < 0) {
1110 ND_PRINT((ndo, "..."));
1111 break;
1112 }
1113 bp += advance;
1114 }
1115 break;
1116 }
1117
1118 case PIMV2_TYPE_PRUNE_REFRESH:
1119 ND_PRINT((ndo, " src="));
1120 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
1121 ND_PRINT((ndo, "..."));
1122 break;
1123 }
1124 bp += advance;
1125 ND_PRINT((ndo, " grp="));
1126 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0)) < 0) {
1127 ND_PRINT((ndo, "..."));
1128 break;
1129 }
1130 bp += advance;
1131 ND_PRINT((ndo, " forwarder="));
1132 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
1133 ND_PRINT((ndo, "..."));
1134 break;
1135 }
1136 bp += advance;
1137 ND_TCHECK2(bp[0], 2);
1138 ND_PRINT((ndo, " TUNR "));
1139 relts_print(ndo, EXTRACT_16BITS(bp));
1140 break;
1141
1142
1143 default:
1144 ND_PRINT((ndo, " [type %d]", PIM_TYPE(pim->pim_typever)));
1145 break;
1146 }
1147
1148 return;
1149
1150 trunc:
1151 ND_PRINT((ndo, "[|pim]"));
1152 }
1153
1154 /*
1155 * Local Variables:
1156 * c-style: whitesmith
1157 * c-basic-offset: 8
1158 * End:
1159 */
[mirror] the TCPdump network dissector