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Fix a non-reentrant code in a function
[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 #define NETDISSECT_REWORKED
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26
27 #include <tcpdump-stdinc.h>
28
29 #include "interface.h"
30 #include "addrtoname.h"
31 #include "extract.h"
32
33 #include "ip.h"
34 #include "ip6.h"
35
36 #define PIMV1_TYPE_QUERY 0
37 #define PIMV1_TYPE_REGISTER 1
38 #define PIMV1_TYPE_REGISTER_STOP 2
39 #define PIMV1_TYPE_JOIN_PRUNE 3
40 #define PIMV1_TYPE_RP_REACHABILITY 4
41 #define PIMV1_TYPE_ASSERT 5
42 #define PIMV1_TYPE_GRAFT 6
43 #define PIMV1_TYPE_GRAFT_ACK 7
44
45 static const struct tok pimv1_type_str[] = {
46 { PIMV1_TYPE_QUERY, "Query" },
47 { PIMV1_TYPE_REGISTER, "Register" },
48 { PIMV1_TYPE_REGISTER_STOP, "Register-Stop" },
49 { PIMV1_TYPE_JOIN_PRUNE, "Join/Prune" },
50 { PIMV1_TYPE_RP_REACHABILITY, "RP-reachable" },
51 { PIMV1_TYPE_ASSERT, "Assert" },
52 { PIMV1_TYPE_GRAFT, "Graft" },
53 { PIMV1_TYPE_GRAFT_ACK, "Graft-ACK" },
54 { 0, NULL }
55 };
56
57 #define PIMV2_TYPE_HELLO 0
58 #define PIMV2_TYPE_REGISTER 1
59 #define PIMV2_TYPE_REGISTER_STOP 2
60 #define PIMV2_TYPE_JOIN_PRUNE 3
61 #define PIMV2_TYPE_BOOTSTRAP 4
62 #define PIMV2_TYPE_ASSERT 5
63 #define PIMV2_TYPE_GRAFT 6
64 #define PIMV2_TYPE_GRAFT_ACK 7
65 #define PIMV2_TYPE_CANDIDATE_RP 8
66 #define PIMV2_TYPE_PRUNE_REFRESH 9
67 #define PIMV2_TYPE_DF_ELECTION 10
68 #define PIMV2_TYPE_ECMP_REDIRECT 11
69
70 static const struct tok pimv2_type_values[] = {
71 { PIMV2_TYPE_HELLO, "Hello" },
72 { PIMV2_TYPE_REGISTER, "Register" },
73 { PIMV2_TYPE_REGISTER_STOP, "Register Stop" },
74 { PIMV2_TYPE_JOIN_PRUNE, "Join / Prune" },
75 { PIMV2_TYPE_BOOTSTRAP, "Bootstrap" },
76 { PIMV2_TYPE_ASSERT, "Assert" },
77 { PIMV2_TYPE_GRAFT, "Graft" },
78 { PIMV2_TYPE_GRAFT_ACK, "Graft Acknowledgement" },
79 { PIMV2_TYPE_CANDIDATE_RP, "Candidate RP Advertisement" },
80 { PIMV2_TYPE_PRUNE_REFRESH, "Prune Refresh" },
81 { PIMV2_TYPE_DF_ELECTION, "DF Election" },
82 { PIMV2_TYPE_ECMP_REDIRECT, "ECMP Redirect" },
83 { 0, NULL}
84 };
85
86 #define PIMV2_HELLO_OPTION_HOLDTIME 1
87 #define PIMV2_HELLO_OPTION_LANPRUNEDELAY 2
88 #define PIMV2_HELLO_OPTION_DR_PRIORITY_OLD 18
89 #define PIMV2_HELLO_OPTION_DR_PRIORITY 19
90 #define PIMV2_HELLO_OPTION_GENID 20
91 #define PIMV2_HELLO_OPTION_REFRESH_CAP 21
92 #define PIMV2_HELLO_OPTION_BIDIR_CAP 22
93 #define PIMV2_HELLO_OPTION_ADDRESS_LIST 24
94 #define PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD 65001
95
96 static const struct tok pimv2_hello_option_values[] = {
97 { PIMV2_HELLO_OPTION_HOLDTIME, "Hold Time" },
98 { PIMV2_HELLO_OPTION_LANPRUNEDELAY, "LAN Prune Delay" },
99 { PIMV2_HELLO_OPTION_DR_PRIORITY_OLD, "DR Priority (Old)" },
100 { PIMV2_HELLO_OPTION_DR_PRIORITY, "DR Priority" },
101 { PIMV2_HELLO_OPTION_GENID, "Generation ID" },
102 { PIMV2_HELLO_OPTION_REFRESH_CAP, "State Refresh Capability" },
103 { PIMV2_HELLO_OPTION_BIDIR_CAP, "Bi-Directional Capability" },
104 { PIMV2_HELLO_OPTION_ADDRESS_LIST, "Address List" },
105 { PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD, "Address List (Old)" },
106 { 0, NULL}
107 };
108
109 #define PIMV2_REGISTER_FLAG_LEN 4
110 #define PIMV2_REGISTER_FLAG_BORDER 0x80000000
111 #define PIMV2_REGISTER_FLAG_NULL 0x40000000
112
113 static const struct tok pimv2_register_flag_values[] = {
114 { PIMV2_REGISTER_FLAG_BORDER, "Border" },
115 { PIMV2_REGISTER_FLAG_NULL, "Null" },
116 { 0, NULL}
117 };
118
119 /*
120 * XXX: We consider a case where IPv6 is not ready yet for portability,
121 * but PIM dependent defintions should be independent of IPv6...
122 */
123
124 struct pim {
125 uint8_t pim_typever;
126 /* upper 4bit: PIM version number; 2 for PIMv2 */
127 /* lower 4bit: the PIM message type, currently they are:
128 * Hello, Register, Register-Stop, Join/Prune,
129 * Bootstrap, Assert, Graft (PIM-DM only),
130 * Graft-Ack (PIM-DM only), C-RP-Adv
131 */
132 #define PIM_VER(x) (((x) & 0xf0) >> 4)
133 #define PIM_TYPE(x) ((x) & 0x0f)
134 u_char pim_rsv; /* Reserved */
135 u_short pim_cksum; /* IP style check sum */
136 };
137
138 static void pimv2_print(netdissect_options *, register const u_char *bp, register u_int len, const u_char *);
139
140 static void
141 pimv1_join_prune_print(netdissect_options *ndo,
142 register const u_char *bp, register u_int len)
143 {
144 int ngroups, njoin, nprune;
145 int njp;
146
147 /* If it's a single group and a single source, use 1-line output. */
148 if (ND_TTEST2(bp[0], 30) && bp[11] == 1 &&
149 ((njoin = EXTRACT_16BITS(&bp[20])) + EXTRACT_16BITS(&bp[22])) == 1) {
150 int hold;
151
152 ND_PRINT((ndo, " RPF %s ", ipaddr_string(ndo, bp)));
153 hold = EXTRACT_16BITS(&bp[6]);
154 if (hold != 180) {
155 ND_PRINT((ndo, "Hold "));
156 relts_print(ndo, hold);
157 }
158 ND_PRINT((ndo, "%s (%s/%d, %s", njoin ? "Join" : "Prune",
159 ipaddr_string(ndo, &bp[26]), bp[25] & 0x3f,
160 ipaddr_string(ndo, &bp[12])));
161 if (EXTRACT_32BITS(&bp[16]) != 0xffffffff)
162 ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[16])));
163 ND_PRINT((ndo, ") %s%s %s",
164 (bp[24] & 0x01) ? "Sparse" : "Dense",
165 (bp[25] & 0x80) ? " WC" : "",
166 (bp[25] & 0x40) ? "RP" : "SPT"));
167 return;
168 }
169
170 ND_TCHECK2(bp[0], sizeof(struct in_addr));
171 if (ndo->ndo_vflag > 1)
172 ND_PRINT((ndo, "\n"));
173 ND_PRINT((ndo, " Upstream Nbr: %s", ipaddr_string(ndo, bp)));
174 ND_TCHECK2(bp[6], 2);
175 if (ndo->ndo_vflag > 1)
176 ND_PRINT((ndo, "\n"));
177 ND_PRINT((ndo, " Hold time: "));
178 relts_print(ndo, EXTRACT_16BITS(&bp[6]));
179 if (ndo->ndo_vflag < 2)
180 return;
181 bp += 8;
182 len -= 8;
183
184 ND_TCHECK2(bp[0], 4);
185 ngroups = bp[3];
186 bp += 4;
187 len -= 4;
188 while (ngroups--) {
189 /*
190 * XXX - does the address have length "addrlen" and the
191 * mask length "maddrlen"?
192 */
193 ND_TCHECK2(bp[0], sizeof(struct in_addr));
194 ND_PRINT((ndo, "\n\tGroup: %s", ipaddr_string(ndo, bp)));
195 ND_TCHECK2(bp[4], sizeof(struct in_addr));
196 if (EXTRACT_32BITS(&bp[4]) != 0xffffffff)
197 ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[4])));
198 ND_TCHECK2(bp[8], 4);
199 njoin = EXTRACT_16BITS(&bp[8]);
200 nprune = EXTRACT_16BITS(&bp[10]);
201 ND_PRINT((ndo, " joined: %d pruned: %d", njoin, nprune));
202 bp += 12;
203 len -= 12;
204 for (njp = 0; njp < (njoin + nprune); njp++) {
205 const char *type;
206
207 if (njp < njoin)
208 type = "Join ";
209 else
210 type = "Prune";
211 ND_TCHECK2(bp[0], 6);
212 ND_PRINT((ndo, "\n\t%s %s%s%s%s/%d", type,
213 (bp[0] & 0x01) ? "Sparse " : "Dense ",
214 (bp[1] & 0x80) ? "WC " : "",
215 (bp[1] & 0x40) ? "RP " : "SPT ",
216 ipaddr_string(ndo, &bp[2]), bp[1] & 0x3f));
217 bp += 6;
218 len -= 6;
219 }
220 }
221 return;
222 trunc:
223 ND_PRINT((ndo, "[|pim]"));
224 return;
225 }
226
227 void
228 pimv1_print(netdissect_options *ndo,
229 register const u_char *bp, register u_int len)
230 {
231 register const u_char *ep;
232 register u_char type;
233
234 ep = (const u_char *)ndo->ndo_snapend;
235 if (bp >= ep)
236 return;
237
238 ND_TCHECK(bp[1]);
239 type = bp[1];
240
241 ND_PRINT((ndo, " %s", tok2str(pimv1_type_str, "[type %u]", type)));
242 switch (type) {
243 case PIMV1_TYPE_QUERY:
244 if (ND_TTEST(bp[8])) {
245 switch (bp[8] >> 4) {
246 case 0:
247 ND_PRINT((ndo, " Dense-mode"));
248 break;
249 case 1:
250 ND_PRINT((ndo, " Sparse-mode"));
251 break;
252 case 2:
253 ND_PRINT((ndo, " Sparse-Dense-mode"));
254 break;
255 default:
256 ND_PRINT((ndo, " mode-%d", bp[8] >> 4));
257 break;
258 }
259 }
260 if (ndo->ndo_vflag) {
261 ND_TCHECK2(bp[10],2);
262 ND_PRINT((ndo, " (Hold-time "));
263 relts_print(ndo, EXTRACT_16BITS(&bp[10]));
264 ND_PRINT((ndo, ")"));
265 }
266 break;
267
268 case PIMV1_TYPE_REGISTER:
269 ND_TCHECK2(bp[8], 20); /* ip header */
270 ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[20]),
271 ipaddr_string(ndo, &bp[24])));
272 break;
273 case PIMV1_TYPE_REGISTER_STOP:
274 ND_TCHECK2(bp[12], sizeof(struct in_addr));
275 ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[8]),
276 ipaddr_string(ndo, &bp[12])));
277 break;
278 case PIMV1_TYPE_RP_REACHABILITY:
279 if (ndo->ndo_vflag) {
280 ND_TCHECK2(bp[22], 2);
281 ND_PRINT((ndo, " group %s", ipaddr_string(ndo, &bp[8])));
282 if (EXTRACT_32BITS(&bp[12]) != 0xffffffff)
283 ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[12])));
284 ND_PRINT((ndo, " RP %s hold ", ipaddr_string(ndo, &bp[16])));
285 relts_print(ndo, EXTRACT_16BITS(&bp[22]));
286 }
287 break;
288 case PIMV1_TYPE_ASSERT:
289 ND_TCHECK2(bp[16], sizeof(struct in_addr));
290 ND_PRINT((ndo, " for %s > %s", ipaddr_string(ndo, &bp[16]),
291 ipaddr_string(ndo, &bp[8])));
292 if (EXTRACT_32BITS(&bp[12]) != 0xffffffff)
293 ND_PRINT((ndo, "/%s", ipaddr_string(ndo, &bp[12])));
294 ND_TCHECK2(bp[24], 4);
295 ND_PRINT((ndo, " %s pref %d metric %d",
296 (bp[20] & 0x80) ? "RP-tree" : "SPT",
297 EXTRACT_32BITS(&bp[20]) & 0x7fffffff,
298 EXTRACT_32BITS(&bp[24])));
299 break;
300 case PIMV1_TYPE_JOIN_PRUNE:
301 case PIMV1_TYPE_GRAFT:
302 case PIMV1_TYPE_GRAFT_ACK:
303 if (ndo->ndo_vflag)
304 pimv1_join_prune_print(ndo, &bp[8], len - 8);
305 break;
306 }
307 if ((bp[4] >> 4) != 1)
308 ND_PRINT((ndo, " [v%d]", bp[4] >> 4));
309 return;
310
311 trunc:
312 ND_PRINT((ndo, "[|pim]"));
313 return;
314 }
315
316 /*
317 * auto-RP is a cisco protocol, documented at
318 * ftp://ftpeng.cisco.com/ipmulticast/specs/pim-autorp-spec01.txt
319 *
320 * This implements version 1+, dated Sept 9, 1998.
321 */
322 void
323 cisco_autorp_print(netdissect_options *ndo,
324 register const u_char *bp, register u_int len)
325 {
326 int type;
327 int numrps;
328 int hold;
329
330 ND_TCHECK(bp[0]);
331 ND_PRINT((ndo, " auto-rp "));
332 type = bp[0];
333 switch (type) {
334 case 0x11:
335 ND_PRINT((ndo, "candidate-advert"));
336 break;
337 case 0x12:
338 ND_PRINT((ndo, "mapping"));
339 break;
340 default:
341 ND_PRINT((ndo, "type-0x%02x", type));
342 break;
343 }
344
345 ND_TCHECK(bp[1]);
346 numrps = bp[1];
347
348 ND_TCHECK2(bp[2], 2);
349 ND_PRINT((ndo, " Hold "));
350 hold = EXTRACT_16BITS(&bp[2]);
351 if (hold)
352 relts_print(ndo, EXTRACT_16BITS(&bp[2]));
353 else
354 ND_PRINT((ndo, "FOREVER"));
355
356 /* Next 4 bytes are reserved. */
357
358 bp += 8; len -= 8;
359
360 /*XXX skip unless -v? */
361
362 /*
363 * Rest of packet:
364 * numrps entries of the form:
365 * 32 bits: RP
366 * 6 bits: reserved
367 * 2 bits: PIM version supported, bit 0 is "supports v1", 1 is "v2".
368 * 8 bits: # of entries for this RP
369 * each entry: 7 bits: reserved, 1 bit: negative,
370 * 8 bits: mask 32 bits: source
371 * lather, rinse, repeat.
372 */
373 while (numrps--) {
374 int nentries;
375 char s;
376
377 ND_TCHECK2(bp[0], 4);
378 ND_PRINT((ndo, " RP %s", ipaddr_string(ndo, bp)));
379 ND_TCHECK(bp[4]);
380 switch (bp[4] & 0x3) {
381 case 0: ND_PRINT((ndo, " PIMv?"));
382 break;
383 case 1: ND_PRINT((ndo, " PIMv1"));
384 break;
385 case 2: ND_PRINT((ndo, " PIMv2"));
386 break;
387 case 3: ND_PRINT((ndo, " PIMv1+2"));
388 break;
389 }
390 if (bp[4] & 0xfc)
391 ND_PRINT((ndo, " [rsvd=0x%02x]", bp[4] & 0xfc));
392 ND_TCHECK(bp[5]);
393 nentries = bp[5];
394 bp += 6; len -= 6;
395 s = ' ';
396 for (; nentries; nentries--) {
397 ND_TCHECK2(bp[0], 6);
398 ND_PRINT((ndo, "%c%s%s/%d", s, bp[0] & 1 ? "!" : "",
399 ipaddr_string(ndo, &bp[2]), bp[1]));
400 if (bp[0] & 0x02) {
401 ND_PRINT((ndo, " bidir"));
402 }
403 if (bp[0] & 0xfc) {
404 ND_PRINT((ndo, "[rsvd=0x%02x]", bp[0] & 0xfc));
405 }
406 s = ',';
407 bp += 6; len -= 6;
408 }
409 }
410 return;
411
412 trunc:
413 ND_PRINT((ndo, "[|autorp]"));
414 return;
415 }
416
417 void
418 pim_print(netdissect_options *ndo,
419 register const u_char *bp, register u_int len, const u_char *bp2)
420 {
421 register const u_char *ep;
422 register struct pim *pim = (struct pim *)bp;
423
424 ep = (const u_char *)ndo->ndo_snapend;
425 if (bp >= ep)
426 return;
427 #ifdef notyet /* currently we see only version and type */
428 ND_TCHECK(pim->pim_rsv);
429 #endif
430
431 switch (PIM_VER(pim->pim_typever)) {
432 case 2:
433 if (!ndo->ndo_vflag) {
434 ND_PRINT((ndo, "PIMv%u, %s, length %u",
435 PIM_VER(pim->pim_typever),
436 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim->pim_typever)),
437 len));
438 return;
439 } else {
440 ND_PRINT((ndo, "PIMv%u, length %u\n\t%s",
441 PIM_VER(pim->pim_typever),
442 len,
443 tok2str(pimv2_type_values,"Unknown Type",PIM_TYPE(pim->pim_typever))));
444 pimv2_print(ndo, bp, len, bp2);
445 }
446 break;
447 default:
448 ND_PRINT((ndo, "PIMv%u, length %u",
449 PIM_VER(pim->pim_typever),
450 len));
451 break;
452 }
453 return;
454 }
455
456 /*
457 * PIMv2 uses encoded address representations.
458 *
459 * The last PIM-SM I-D before RFC2117 was published specified the
460 * following representation for unicast addresses. However, RFC2117
461 * specified no encoding for unicast addresses with the unicast
462 * address length specified in the header. Therefore, we have to
463 * guess which encoding is being used (Cisco's PIMv2 implementation
464 * uses the non-RFC encoding). RFC2117 turns a previously "Reserved"
465 * field into a 'unicast-address-length-in-bytes' field. We guess
466 * that it's the draft encoding if this reserved field is zero.
467 *
468 * RFC2362 goes back to the encoded format, and calls the addr length
469 * field "reserved" again.
470 *
471 * The first byte is the address family, from:
472 *
473 * 0 Reserved
474 * 1 IP (IP version 4)
475 * 2 IP6 (IP version 6)
476 * 3 NSAP
477 * 4 HDLC (8-bit multidrop)
478 * 5 BBN 1822
479 * 6 802 (includes all 802 media plus Ethernet "canonical format")
480 * 7 E.163
481 * 8 E.164 (SMDS, Frame Relay, ATM)
482 * 9 F.69 (Telex)
483 * 10 X.121 (X.25, Frame Relay)
484 * 11 IPX
485 * 12 Appletalk
486 * 13 Decnet IV
487 * 14 Banyan Vines
488 * 15 E.164 with NSAP format subaddress
489 *
490 * In addition, the second byte is an "Encoding". 0 is the default
491 * encoding for the address family, and no other encodings are currently
492 * specified.
493 *
494 */
495
496 static int pimv2_addr_len;
497
498 enum pimv2_addrtype {
499 pimv2_unicast, pimv2_group, pimv2_source
500 };
501
502 /* 0 1 2 3
503 * 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
504 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
505 * | Addr Family | Encoding Type | Unicast Address |
506 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+++++++
507 * 0 1 2 3
508 * 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
509 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
510 * | Addr Family | Encoding Type | Reserved | Mask Len |
511 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
512 * | Group multicast Address |
513 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
514 * 0 1 2 3
515 * 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
516 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
517 * | Addr Family | Encoding Type | Rsrvd |S|W|R| Mask Len |
518 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
519 * | Source Address |
520 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
521 */
522 static int
523 pimv2_addr_print(netdissect_options *ndo,
524 const u_char *bp, enum pimv2_addrtype at, int silent)
525 {
526 int af;
527 int len, hdrlen;
528
529 ND_TCHECK(bp[0]);
530
531 if (pimv2_addr_len == 0) {
532 ND_TCHECK(bp[1]);
533 switch (bp[0]) {
534 case 1:
535 af = AF_INET;
536 len = sizeof(struct in_addr);
537 break;
538 #ifdef INET6
539 case 2:
540 af = AF_INET6;
541 len = sizeof(struct in6_addr);
542 break;
543 #endif
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 #ifdef INET6
556 case sizeof(struct in6_addr):
557 af = AF_INET6;
558 break;
559 #endif
560 default:
561 return -1;
562 break;
563 }
564 len = pimv2_addr_len;
565 hdrlen = 0;
566 }
567
568 bp += hdrlen;
569 switch (at) {
570 case pimv2_unicast:
571 ND_TCHECK2(bp[0], len);
572 if (af == AF_INET) {
573 if (!silent)
574 ND_PRINT((ndo, "%s", ipaddr_string(ndo, bp)));
575 }
576 #ifdef INET6
577 else if (af == AF_INET6) {
578 if (!silent)
579 ND_PRINT((ndo, "%s", ip6addr_string(ndo, bp)));
580 }
581 #endif
582 return hdrlen + len;
583 case pimv2_group:
584 case pimv2_source:
585 ND_TCHECK2(bp[0], len + 2);
586 if (af == AF_INET) {
587 if (!silent) {
588 ND_PRINT((ndo, "%s", ipaddr_string(ndo, bp + 2)));
589 if (bp[1] != 32)
590 ND_PRINT((ndo, "/%u", bp[1]));
591 }
592 }
593 #ifdef INET6
594 else if (af == AF_INET6) {
595 if (!silent) {
596 ND_PRINT((ndo, "%s", ip6addr_string(ndo, bp + 2)));
597 if (bp[1] != 128)
598 ND_PRINT((ndo, "/%u", bp[1]));
599 }
600 }
601 #endif
602 if (bp[0] && !silent) {
603 if (at == pimv2_group) {
604 ND_PRINT((ndo, "(0x%02x)", bp[0]));
605 } else {
606 ND_PRINT((ndo, "(%s%s%s",
607 bp[0] & 0x04 ? "S" : "",
608 bp[0] & 0x02 ? "W" : "",
609 bp[0] & 0x01 ? "R" : ""));
610 if (bp[0] & 0xf8) {
611 ND_PRINT((ndo, "+0x%02x", bp[0] & 0xf8));
612 }
613 ND_PRINT((ndo, ")"));
614 }
615 }
616 return hdrlen + 2 + len;
617 default:
618 return -1;
619 }
620 trunc:
621 return -1;
622 }
623
624 enum checksum_status {
625 CORRECT,
626 INCORRECT,
627 UNVERIFIED
628 };
629
630 static enum checksum_status
631 pimv2_check_checksum(const u_char *bp, const u_char *bp2, u_int len)
632 {
633 const struct ip *ip;
634 u_int cksum;
635
636 ip = (const struct ip *)bp2;
637 if (IP_V(ip) == 4) {
638 struct cksum_vec vec[1];
639
640 vec[0].ptr = bp;
641 vec[0].len = len;
642 cksum = in_cksum(vec, 1);
643 return (cksum ? INCORRECT : CORRECT);
644 #ifdef INET6
645 } else if (IP_V(ip) == 6) {
646 const struct ip6_hdr *ip6;
647
648 ip6 = (const struct ip6_hdr *)bp2;
649 cksum = nextproto6_cksum(ip6, bp, len, len, IPPROTO_PIM);
650 return (cksum ? INCORRECT : CORRECT);
651 #endif
652 } else {
653 return (UNVERIFIED);
654 }
655 }
656
657 static void
658 pimv2_print(netdissect_options *ndo,
659 register const u_char *bp, register u_int len, const u_char *bp2)
660 {
661 register const u_char *ep;
662 register struct pim *pim = (struct pim *)bp;
663 int advance;
664 enum checksum_status cksum_status;
665
666 ep = (const u_char *)ndo->ndo_snapend;
667 if (bp >= ep)
668 return;
669 if (ep > bp + len)
670 ep = bp + len;
671 ND_TCHECK(pim->pim_rsv);
672 pimv2_addr_len = pim->pim_rsv;
673 if (pimv2_addr_len != 0)
674 ND_PRINT((ndo, ", RFC2117-encoding"));
675
676 ND_PRINT((ndo, ", cksum 0x%04x ", EXTRACT_16BITS(&pim->pim_cksum)));
677 if (EXTRACT_16BITS(&pim->pim_cksum) == 0) {
678 ND_PRINT((ndo, "(unverified)"));
679 } else {
680 if (PIM_TYPE(pim->pim_typever) == PIMV2_TYPE_REGISTER) {
681 /*
682 * The checksum only covers the packet header,
683 * not the encapsulated packet.
684 */
685 cksum_status = pimv2_check_checksum(bp, bp2, 8);
686 if (cksum_status == INCORRECT) {
687 /*
688 * To quote RFC 4601, "For interoperability
689 * reasons, a message carrying a checksum
690 * calculated over the entire PIM Register
691 * message should also be accepted."
692 */
693 cksum_status = pimv2_check_checksum(bp, bp2, len);
694 }
695 } else {
696 /*
697 * The checksum covers the entire packet.
698 */
699 cksum_status = pimv2_check_checksum(bp, bp2, len);
700 }
701 switch (cksum_status) {
702
703 case CORRECT:
704 ND_PRINT((ndo, "(correct)"));
705 break;
706
707 case INCORRECT:
708 ND_PRINT((ndo, "(incorrect)"));
709 break;
710
711 case UNVERIFIED:
712 ND_PRINT((ndo, "(unverified)"));
713 break;
714 }
715 }
716
717 switch (PIM_TYPE(pim->pim_typever)) {
718 case PIMV2_TYPE_HELLO:
719 {
720 uint16_t otype, olen;
721 bp += 4;
722 while (bp < ep) {
723 ND_TCHECK2(bp[0], 4);
724 otype = EXTRACT_16BITS(&bp[0]);
725 olen = EXTRACT_16BITS(&bp[2]);
726 ND_TCHECK2(bp[0], 4 + olen);
727 ND_PRINT((ndo, "\n\t %s Option (%u), length %u, Value: ",
728 tok2str(pimv2_hello_option_values, "Unknown", otype),
729 otype,
730 olen));
731 bp += 4;
732
733 switch (otype) {
734 case PIMV2_HELLO_OPTION_HOLDTIME:
735 relts_print(ndo, EXTRACT_16BITS(bp));
736 break;
737
738 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
739 if (olen != 4) {
740 ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
741 } else {
742 char t_bit;
743 uint16_t lan_delay, override_interval;
744 lan_delay = EXTRACT_16BITS(bp);
745 override_interval = EXTRACT_16BITS(bp+2);
746 t_bit = (lan_delay & 0x8000)? 1 : 0;
747 lan_delay &= ~0x8000;
748 ND_PRINT((ndo, "\n\t T-bit=%d, LAN delay %dms, Override interval %dms",
749 t_bit, lan_delay, override_interval));
750 }
751 break;
752
753 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
754 case PIMV2_HELLO_OPTION_DR_PRIORITY:
755 switch (olen) {
756 case 0:
757 ND_PRINT((ndo, "Bi-Directional Capability (Old)"));
758 break;
759 case 4:
760 ND_PRINT((ndo, "%u", EXTRACT_32BITS(bp)));
761 break;
762 default:
763 ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
764 break;
765 }
766 break;
767
768 case PIMV2_HELLO_OPTION_GENID:
769 ND_PRINT((ndo, "0x%08x", EXTRACT_32BITS(bp)));
770 break;
771
772 case PIMV2_HELLO_OPTION_REFRESH_CAP:
773 ND_PRINT((ndo, "v%d", *bp));
774 if (*(bp+1) != 0) {
775 ND_PRINT((ndo, ", interval "));
776 relts_print(ndo, *(bp+1));
777 }
778 if (EXTRACT_16BITS(bp+2) != 0) {
779 ND_PRINT((ndo, " ?0x%04x?", EXTRACT_16BITS(bp+2)));
780 }
781 break;
782
783 case PIMV2_HELLO_OPTION_BIDIR_CAP:
784 break;
785
786 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
787 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
788 if (ndo->ndo_vflag > 1) {
789 const u_char *ptr = bp;
790 while (ptr < (bp+olen)) {
791 int advance;
792
793 ND_PRINT((ndo, "\n\t "));
794 advance = pimv2_addr_print(ndo, ptr, pimv2_unicast, 0);
795 if (advance < 0) {
796 ND_PRINT((ndo, "..."));
797 break;
798 }
799 ptr += advance;
800 }
801 }
802 break;
803 default:
804 if (ndo->ndo_vflag <= 1)
805 print_unknown_data(ndo, bp, "\n\t ", olen);
806 break;
807 }
808 /* do we want to see an additionally hexdump ? */
809 if (ndo->ndo_vflag> 1)
810 print_unknown_data(ndo, bp, "\n\t ", olen);
811 bp += olen;
812 }
813 break;
814 }
815
816 case PIMV2_TYPE_REGISTER:
817 {
818 struct ip *ip;
819
820 ND_TCHECK2(*(bp + 4), PIMV2_REGISTER_FLAG_LEN);
821
822 ND_PRINT((ndo, ", Flags [ %s ]\n\t",
823 tok2str(pimv2_register_flag_values,
824 "none",
825 EXTRACT_32BITS(bp+4))));
826
827 bp += 8; len -= 8;
828 /* encapsulated multicast packet */
829 ip = (struct ip *)bp;
830 switch (IP_V(ip)) {
831 case 0: /* Null header */
832 ND_PRINT((ndo, "IP-Null-header %s > %s",
833 ipaddr_string(ndo, &ip->ip_src),
834 ipaddr_string(ndo, &ip->ip_dst)));
835 break;
836
837 case 4: /* IPv4 */
838 ip_print(ndo, bp, len);
839 break;
840
841 case 6: /* IPv6 */
842 ip6_print(ndo, bp, len);
843 break;
844
845 default:
846 ND_PRINT((ndo, "IP ver %d", IP_V(ip)));
847 break;
848 }
849 break;
850 }
851
852 case PIMV2_TYPE_REGISTER_STOP:
853 bp += 4; len -= 4;
854 if (bp >= ep)
855 break;
856 ND_PRINT((ndo, " group="));
857 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0)) < 0) {
858 ND_PRINT((ndo, "..."));
859 break;
860 }
861 bp += advance; len -= advance;
862 if (bp >= ep)
863 break;
864 ND_PRINT((ndo, " source="));
865 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
866 ND_PRINT((ndo, "..."));
867 break;
868 }
869 bp += advance; len -= advance;
870 break;
871
872 case PIMV2_TYPE_JOIN_PRUNE:
873 case PIMV2_TYPE_GRAFT:
874 case PIMV2_TYPE_GRAFT_ACK:
875
876
877 /*
878 * 0 1 2 3
879 * 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
880 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
881 * |PIM Ver| Type | Addr length | Checksum |
882 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
883 * | Unicast-Upstream Neighbor Address |
884 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
885 * | Reserved | Num groups | Holdtime |
886 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
887 * | Encoded-Multicast Group Address-1 |
888 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
889 * | Number of Joined Sources | Number of Pruned Sources |
890 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
891 * | Encoded-Joined Source Address-1 |
892 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
893 * | . |
894 * | . |
895 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
896 * | Encoded-Joined Source Address-n |
897 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
898 * | Encoded-Pruned Source Address-1 |
899 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
900 * | . |
901 * | . |
902 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
903 * | Encoded-Pruned Source Address-n |
904 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
905 * | . |
906 * | . |
907 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
908 * | Encoded-Multicast Group Address-n |
909 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
910 */
911
912 {
913 uint8_t ngroup;
914 uint16_t holdtime;
915 uint16_t njoin;
916 uint16_t nprune;
917 int i, j;
918
919 bp += 4; len -= 4;
920 if (PIM_TYPE(pim->pim_typever) != 7) { /*not for Graft-ACK*/
921 if (bp >= ep)
922 break;
923 ND_PRINT((ndo, ", upstream-neighbor: "));
924 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
925 ND_PRINT((ndo, "..."));
926 break;
927 }
928 bp += advance; len -= advance;
929 }
930 if (bp + 4 > ep)
931 break;
932 ngroup = bp[1];
933 holdtime = EXTRACT_16BITS(&bp[2]);
934 ND_PRINT((ndo, "\n\t %u group(s)", ngroup));
935 if (PIM_TYPE(pim->pim_typever) != 7) { /*not for Graft-ACK*/
936 ND_PRINT((ndo, ", holdtime: "));
937 if (holdtime == 0xffff)
938 ND_PRINT((ndo, "infinite"));
939 else
940 relts_print(ndo, holdtime);
941 }
942 bp += 4; len -= 4;
943 for (i = 0; i < ngroup; i++) {
944 if (bp >= ep)
945 goto jp_done;
946 ND_PRINT((ndo, "\n\t group #%u: ", i+1));
947 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0)) < 0) {
948 ND_PRINT((ndo, "...)"));
949 goto jp_done;
950 }
951 bp += advance; len -= advance;
952 if (bp + 4 > ep) {
953 ND_PRINT((ndo, "...)"));
954 goto jp_done;
955 }
956 njoin = EXTRACT_16BITS(&bp[0]);
957 nprune = EXTRACT_16BITS(&bp[2]);
958 ND_PRINT((ndo, ", joined sources: %u, pruned sources: %u", njoin, nprune));
959 bp += 4; len -= 4;
960 for (j = 0; j < njoin; j++) {
961 ND_PRINT((ndo, "\n\t joined source #%u: ", j+1));
962 if ((advance = pimv2_addr_print(ndo, bp, pimv2_source, 0)) < 0) {
963 ND_PRINT((ndo, "...)"));
964 goto jp_done;
965 }
966 bp += advance; len -= advance;
967 }
968 for (j = 0; j < nprune; j++) {
969 ND_PRINT((ndo, "\n\t pruned source #%u: ", j+1));
970 if ((advance = pimv2_addr_print(ndo, bp, pimv2_source, 0)) < 0) {
971 ND_PRINT((ndo, "...)"));
972 goto jp_done;
973 }
974 bp += advance; len -= advance;
975 }
976 }
977 jp_done:
978 break;
979 }
980
981 case PIMV2_TYPE_BOOTSTRAP:
982 {
983 int i, j, frpcnt;
984 bp += 4;
985
986 /* Fragment Tag, Hash Mask len, and BSR-priority */
987 if (bp + sizeof(uint16_t) >= ep) break;
988 ND_PRINT((ndo, " tag=%x", EXTRACT_16BITS(bp)));
989 bp += sizeof(uint16_t);
990 if (bp >= ep) break;
991 ND_PRINT((ndo, " hashmlen=%d", bp[0]));
992 if (bp + 1 >= ep) break;
993 ND_PRINT((ndo, " BSRprio=%d", bp[1]));
994 bp += 2;
995
996 /* Encoded-Unicast-BSR-Address */
997 if (bp >= ep) break;
998 ND_PRINT((ndo, " BSR="));
999 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
1000 ND_PRINT((ndo, "..."));
1001 break;
1002 }
1003 bp += advance;
1004
1005 for (i = 0; bp < ep; i++) {
1006 /* Encoded-Group Address */
1007 ND_PRINT((ndo, " (group%d: ", i));
1008 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0))
1009 < 0) {
1010 ND_PRINT((ndo, "...)"));
1011 goto bs_done;
1012 }
1013 bp += advance;
1014
1015 /* RP-Count, Frag RP-Cnt, and rsvd */
1016 if (bp >= ep) {
1017 ND_PRINT((ndo, "...)"));
1018 goto bs_done;
1019 }
1020 ND_PRINT((ndo, " RPcnt=%d", bp[0]));
1021 if (bp + 1 >= ep) {
1022 ND_PRINT((ndo, "...)"));
1023 goto bs_done;
1024 }
1025 ND_PRINT((ndo, " FRPcnt=%d", frpcnt = bp[1]));
1026 bp += 4;
1027
1028 for (j = 0; j < frpcnt && bp < ep; j++) {
1029 /* each RP info */
1030 ND_PRINT((ndo, " RP%d=", j));
1031 if ((advance = pimv2_addr_print(ndo, bp,
1032 pimv2_unicast,
1033 0)) < 0) {
1034 ND_PRINT((ndo, "...)"));
1035 goto bs_done;
1036 }
1037 bp += advance;
1038
1039 if (bp + 1 >= ep) {
1040 ND_PRINT((ndo, "...)"));
1041 goto bs_done;
1042 }
1043 ND_PRINT((ndo, ",holdtime="));
1044 relts_print(ndo, EXTRACT_16BITS(bp));
1045 if (bp + 2 >= ep) {
1046 ND_PRINT((ndo, "...)"));
1047 goto bs_done;
1048 }
1049 ND_PRINT((ndo, ",prio=%d", bp[2]));
1050 bp += 4;
1051 }
1052 ND_PRINT((ndo, ")"));
1053 }
1054 bs_done:
1055 break;
1056 }
1057 case PIMV2_TYPE_ASSERT:
1058 bp += 4; len -= 4;
1059 if (bp >= ep)
1060 break;
1061 ND_PRINT((ndo, " group="));
1062 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0)) < 0) {
1063 ND_PRINT((ndo, "..."));
1064 break;
1065 }
1066 bp += advance; len -= advance;
1067 if (bp >= ep)
1068 break;
1069 ND_PRINT((ndo, " src="));
1070 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
1071 ND_PRINT((ndo, "..."));
1072 break;
1073 }
1074 bp += advance; len -= advance;
1075 if (bp + 8 > ep)
1076 break;
1077 if (bp[0] & 0x80)
1078 ND_PRINT((ndo, " RPT"));
1079 ND_PRINT((ndo, " pref=%u", EXTRACT_32BITS(&bp[0]) & 0x7fffffff));
1080 ND_PRINT((ndo, " metric=%u", EXTRACT_32BITS(&bp[4])));
1081 break;
1082
1083 case PIMV2_TYPE_CANDIDATE_RP:
1084 {
1085 int i, pfxcnt;
1086 bp += 4;
1087
1088 /* Prefix-Cnt, Priority, and Holdtime */
1089 if (bp >= ep) break;
1090 ND_PRINT((ndo, " prefix-cnt=%d", bp[0]));
1091 pfxcnt = bp[0];
1092 if (bp + 1 >= ep) break;
1093 ND_PRINT((ndo, " prio=%d", bp[1]));
1094 if (bp + 3 >= ep) break;
1095 ND_PRINT((ndo, " holdtime="));
1096 relts_print(ndo, EXTRACT_16BITS(&bp[2]));
1097 bp += 4;
1098
1099 /* Encoded-Unicast-RP-Address */
1100 if (bp >= ep) break;
1101 ND_PRINT((ndo, " RP="));
1102 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
1103 ND_PRINT((ndo, "..."));
1104 break;
1105 }
1106 bp += advance;
1107
1108 /* Encoded-Group Addresses */
1109 for (i = 0; i < pfxcnt && bp < ep; i++) {
1110 ND_PRINT((ndo, " Group%d=", i));
1111 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0))
1112 < 0) {
1113 ND_PRINT((ndo, "..."));
1114 break;
1115 }
1116 bp += advance;
1117 }
1118 break;
1119 }
1120
1121 case PIMV2_TYPE_PRUNE_REFRESH:
1122 ND_PRINT((ndo, " src="));
1123 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
1124 ND_PRINT((ndo, "..."));
1125 break;
1126 }
1127 bp += advance;
1128 ND_PRINT((ndo, " grp="));
1129 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0)) < 0) {
1130 ND_PRINT((ndo, "..."));
1131 break;
1132 }
1133 bp += advance;
1134 ND_PRINT((ndo, " forwarder="));
1135 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
1136 ND_PRINT((ndo, "..."));
1137 break;
1138 }
1139 bp += advance;
1140 ND_TCHECK2(bp[0], 2);
1141 ND_PRINT((ndo, " TUNR "));
1142 relts_print(ndo, EXTRACT_16BITS(bp));
1143 break;
1144
1145
1146 default:
1147 ND_PRINT((ndo, " [type %d]", PIM_TYPE(pim->pim_typever)));
1148 break;
1149 }
1150
1151 return;
1152
1153 trunc:
1154 ND_PRINT((ndo, "[|pim]"));
1155 }
1156
1157 /*
1158 * Local Variables:
1159 * c-style: whitesmith
1160 * c-basic-offset: 8
1161 * End:
1162 */
[mirror] the TCPdump network dissector