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