nexmon – Blame information for rev 1

Subversion Repositories:
Rev:
Rev Author Line No. Line
1 office 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  
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, u_int cksum);
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, u_int cksum)
419 {
420 register const u_char *ep;
421 register struct pim *pim = (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, cksum);
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 static void
624 pimv2_print(netdissect_options *ndo,
625 register const u_char *bp, register u_int len, u_int cksum)
626 {
627 register const u_char *ep;
628 register struct pim *pim = (struct pim *)bp;
629 int advance;
630  
631 ep = (const u_char *)ndo->ndo_snapend;
632 if (bp >= ep)
633 return;
634 if (ep > bp + len)
635 ep = bp + len;
636 ND_TCHECK(pim->pim_rsv);
637 pimv2_addr_len = pim->pim_rsv;
638 if (pimv2_addr_len != 0)
639 ND_PRINT((ndo, ", RFC2117-encoding"));
640  
641 ND_PRINT((ndo, ", cksum 0x%04x ", EXTRACT_16BITS(&pim->pim_cksum)));
642 if (EXTRACT_16BITS(&pim->pim_cksum) == 0) {
643 ND_PRINT((ndo, "(unverified)"));
644 } else {
645 ND_PRINT((ndo, "(%scorrect)", ND_TTEST2(bp[0], len) && cksum ? "in" : "" ));
646 }
647  
648 switch (PIM_TYPE(pim->pim_typever)) {
649 case PIMV2_TYPE_HELLO:
650 {
651 uint16_t otype, olen;
652 bp += 4;
653 while (bp < ep) {
654 ND_TCHECK2(bp[0], 4);
655 otype = EXTRACT_16BITS(&bp[0]);
656 olen = EXTRACT_16BITS(&bp[2]);
657 ND_TCHECK2(bp[0], 4 + olen);
658 ND_PRINT((ndo, "\n\t %s Option (%u), length %u, Value: ",
659 tok2str(pimv2_hello_option_values, "Unknown", otype),
660 otype,
661 olen));
662 bp += 4;
663  
664 switch (otype) {
665 case PIMV2_HELLO_OPTION_HOLDTIME:
666 relts_print(ndo, EXTRACT_16BITS(bp));
667 break;
668  
669 case PIMV2_HELLO_OPTION_LANPRUNEDELAY:
670 if (olen != 4) {
671 ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
672 } else {
673 char t_bit;
674 uint16_t lan_delay, override_interval;
675 lan_delay = EXTRACT_16BITS(bp);
676 override_interval = EXTRACT_16BITS(bp+2);
677 t_bit = (lan_delay & 0x8000)? 1 : 0;
678 lan_delay &= ~0x8000;
679 ND_PRINT((ndo, "\n\t T-bit=%d, LAN delay %dms, Override interval %dms",
680 t_bit, lan_delay, override_interval));
681 }
682 break;
683  
684 case PIMV2_HELLO_OPTION_DR_PRIORITY_OLD:
685 case PIMV2_HELLO_OPTION_DR_PRIORITY:
686 switch (olen) {
687 case 0:
688 ND_PRINT((ndo, "Bi-Directional Capability (Old)"));
689 break;
690 case 4:
691 ND_PRINT((ndo, "%u", EXTRACT_32BITS(bp)));
692 break;
693 default:
694 ND_PRINT((ndo, "ERROR: Option Length != 4 Bytes (%u)", olen));
695 break;
696 }
697 break;
698  
699 case PIMV2_HELLO_OPTION_GENID:
700 ND_PRINT((ndo, "0x%08x", EXTRACT_32BITS(bp)));
701 break;
702  
703 case PIMV2_HELLO_OPTION_REFRESH_CAP:
704 ND_PRINT((ndo, "v%d", *bp));
705 if (*(bp+1) != 0) {
706 ND_PRINT((ndo, ", interval "));
707 relts_print(ndo, *(bp+1));
708 }
709 if (EXTRACT_16BITS(bp+2) != 0) {
710 ND_PRINT((ndo, " ?0x%04x?", EXTRACT_16BITS(bp+2)));
711 }
712 break;
713  
714 case PIMV2_HELLO_OPTION_BIDIR_CAP:
715 break;
716  
717 case PIMV2_HELLO_OPTION_ADDRESS_LIST_OLD:
718 case PIMV2_HELLO_OPTION_ADDRESS_LIST:
719 if (ndo->ndo_vflag > 1) {
720 const u_char *ptr = bp;
721 while (ptr < (bp+olen)) {
722 int advance;
723  
724 ND_PRINT((ndo, "\n\t "));
725 advance = pimv2_addr_print(ndo, ptr, pimv2_unicast, 0);
726 if (advance < 0) {
727 ND_PRINT((ndo, "..."));
728 break;
729 }
730 ptr += advance;
731 }
732 }
733 break;
734 default:
735 if (ndo->ndo_vflag <= 1)
736 print_unknown_data(ndo, bp, "\n\t ", olen);
737 break;
738 }
739 /* do we want to see an additionally hexdump ? */
740 if (ndo->ndo_vflag> 1)
741 print_unknown_data(ndo, bp, "\n\t ", olen);
742 bp += olen;
743 }
744 break;
745 }
746  
747 case PIMV2_TYPE_REGISTER:
748 {
749 struct ip *ip;
750  
751 ND_TCHECK2(*(bp + 4), PIMV2_REGISTER_FLAG_LEN);
752  
753 ND_PRINT((ndo, ", Flags [ %s ]\n\t",
754 tok2str(pimv2_register_flag_values,
755 "none",
756 EXTRACT_32BITS(bp+4))));
757  
758 bp += 8; len -= 8;
759 /* encapsulated multicast packet */
760 ip = (struct ip *)bp;
761 switch (IP_V(ip)) {
762 case 0: /* Null header */
763 ND_PRINT((ndo, "IP-Null-header %s > %s",
764 ipaddr_string(ndo, &ip->ip_src),
765 ipaddr_string(ndo, &ip->ip_dst)));
766 break;
767  
768 case 4: /* IPv4 */
769 ip_print(ndo, bp, len);
770 break;
771  
772 case 6: /* IPv6 */
773 ip6_print(ndo, bp, len);
774 break;
775  
776 default:
777 ND_PRINT((ndo, "IP ver %d", IP_V(ip)));
778 break;
779 }
780 break;
781 }
782  
783 case PIMV2_TYPE_REGISTER_STOP:
784 bp += 4; len -= 4;
785 if (bp >= ep)
786 break;
787 ND_PRINT((ndo, " group="));
788 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0)) < 0) {
789 ND_PRINT((ndo, "..."));
790 break;
791 }
792 bp += advance; len -= advance;
793 if (bp >= ep)
794 break;
795 ND_PRINT((ndo, " source="));
796 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
797 ND_PRINT((ndo, "..."));
798 break;
799 }
800 bp += advance; len -= advance;
801 break;
802  
803 case PIMV2_TYPE_JOIN_PRUNE:
804 case PIMV2_TYPE_GRAFT:
805 case PIMV2_TYPE_GRAFT_ACK:
806  
807  
808 /*
809 * 0 1 2 3
810 * 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
811 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
812 * |PIM Ver| Type | Addr length | Checksum |
813 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
814 * | Unicast-Upstream Neighbor Address |
815 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
816 * | Reserved | Num groups | Holdtime |
817 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
818 * | Encoded-Multicast Group Address-1 |
819 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
820 * | Number of Joined Sources | Number of Pruned Sources |
821 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
822 * | Encoded-Joined Source Address-1 |
823 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
824 * | . |
825 * | . |
826 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
827 * | Encoded-Joined Source Address-n |
828 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
829 * | Encoded-Pruned Source Address-1 |
830 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
831 * | . |
832 * | . |
833 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
834 * | Encoded-Pruned Source Address-n |
835 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
836 * | . |
837 * | . |
838 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
839 * | Encoded-Multicast Group Address-n |
840 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
841 */
842  
843 {
844 uint8_t ngroup;
845 uint16_t holdtime;
846 uint16_t njoin;
847 uint16_t nprune;
848 int i, j;
849  
850 bp += 4; len -= 4;
851 if (PIM_TYPE(pim->pim_typever) != 7) { /*not for Graft-ACK*/
852 if (bp >= ep)
853 break;
854 ND_PRINT((ndo, ", upstream-neighbor: "));
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 }
861 if (bp + 4 > ep)
862 break;
863 ngroup = bp[1];
864 holdtime = EXTRACT_16BITS(&bp[2]);
865 ND_PRINT((ndo, "\n\t %u group(s)", ngroup));
866 if (PIM_TYPE(pim->pim_typever) != 7) { /*not for Graft-ACK*/
867 ND_PRINT((ndo, ", holdtime: "));
868 if (holdtime == 0xffff)
869 ND_PRINT((ndo, "infinite"));
870 else
871 relts_print(ndo, holdtime);
872 }
873 bp += 4; len -= 4;
874 for (i = 0; i < ngroup; i++) {
875 if (bp >= ep)
876 goto jp_done;
877 ND_PRINT((ndo, "\n\t group #%u: ", i+1));
878 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0)) < 0) {
879 ND_PRINT((ndo, "...)"));
880 goto jp_done;
881 }
882 bp += advance; len -= advance;
883 if (bp + 4 > ep) {
884 ND_PRINT((ndo, "...)"));
885 goto jp_done;
886 }
887 njoin = EXTRACT_16BITS(&bp[0]);
888 nprune = EXTRACT_16BITS(&bp[2]);
889 ND_PRINT((ndo, ", joined sources: %u, pruned sources: %u", njoin, nprune));
890 bp += 4; len -= 4;
891 for (j = 0; j < njoin; j++) {
892 ND_PRINT((ndo, "\n\t joined source #%u: ", j+1));
893 if ((advance = pimv2_addr_print(ndo, bp, pimv2_source, 0)) < 0) {
894 ND_PRINT((ndo, "...)"));
895 goto jp_done;
896 }
897 bp += advance; len -= advance;
898 }
899 for (j = 0; j < nprune; j++) {
900 ND_PRINT((ndo, "\n\t pruned source #%u: ", j+1));
901 if ((advance = pimv2_addr_print(ndo, bp, pimv2_source, 0)) < 0) {
902 ND_PRINT((ndo, "...)"));
903 goto jp_done;
904 }
905 bp += advance; len -= advance;
906 }
907 }
908 jp_done:
909 break;
910 }
911  
912 case PIMV2_TYPE_BOOTSTRAP:
913 {
914 int i, j, frpcnt;
915 bp += 4;
916  
917 /* Fragment Tag, Hash Mask len, and BSR-priority */
918 if (bp + sizeof(uint16_t) >= ep) break;
919 ND_PRINT((ndo, " tag=%x", EXTRACT_16BITS(bp)));
920 bp += sizeof(uint16_t);
921 if (bp >= ep) break;
922 ND_PRINT((ndo, " hashmlen=%d", bp[0]));
923 if (bp + 1 >= ep) break;
924 ND_PRINT((ndo, " BSRprio=%d", bp[1]));
925 bp += 2;
926  
927 /* Encoded-Unicast-BSR-Address */
928 if (bp >= ep) break;
929 ND_PRINT((ndo, " BSR="));
930 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
931 ND_PRINT((ndo, "..."));
932 break;
933 }
934 bp += advance;
935  
936 for (i = 0; bp < ep; i++) {
937 /* Encoded-Group Address */
938 ND_PRINT((ndo, " (group%d: ", i));
939 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0))
940 < 0) {
941 ND_PRINT((ndo, "...)"));
942 goto bs_done;
943 }
944 bp += advance;
945  
946 /* RP-Count, Frag RP-Cnt, and rsvd */
947 if (bp >= ep) {
948 ND_PRINT((ndo, "...)"));
949 goto bs_done;
950 }
951 ND_PRINT((ndo, " RPcnt=%d", bp[0]));
952 if (bp + 1 >= ep) {
953 ND_PRINT((ndo, "...)"));
954 goto bs_done;
955 }
956 ND_PRINT((ndo, " FRPcnt=%d", frpcnt = bp[1]));
957 bp += 4;
958  
959 for (j = 0; j < frpcnt && bp < ep; j++) {
960 /* each RP info */
961 ND_PRINT((ndo, " RP%d=", j));
962 if ((advance = pimv2_addr_print(ndo, bp,
963 pimv2_unicast,
964 0)) < 0) {
965 ND_PRINT((ndo, "...)"));
966 goto bs_done;
967 }
968 bp += advance;
969  
970 if (bp + 1 >= ep) {
971 ND_PRINT((ndo, "...)"));
972 goto bs_done;
973 }
974 ND_PRINT((ndo, ",holdtime="));
975 relts_print(ndo, EXTRACT_16BITS(bp));
976 if (bp + 2 >= ep) {
977 ND_PRINT((ndo, "...)"));
978 goto bs_done;
979 }
980 ND_PRINT((ndo, ",prio=%d", bp[2]));
981 bp += 4;
982 }
983 ND_PRINT((ndo, ")"));
984 }
985 bs_done:
986 break;
987 }
988 case PIMV2_TYPE_ASSERT:
989 bp += 4; len -= 4;
990 if (bp >= ep)
991 break;
992 ND_PRINT((ndo, " group="));
993 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0)) < 0) {
994 ND_PRINT((ndo, "..."));
995 break;
996 }
997 bp += advance; len -= advance;
998 if (bp >= ep)
999 break;
1000 ND_PRINT((ndo, " src="));
1001 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
1002 ND_PRINT((ndo, "..."));
1003 break;
1004 }
1005 bp += advance; len -= advance;
1006 if (bp + 8 > ep)
1007 break;
1008 if (bp[0] & 0x80)
1009 ND_PRINT((ndo, " RPT"));
1010 ND_PRINT((ndo, " pref=%u", EXTRACT_32BITS(&bp[0]) & 0x7fffffff));
1011 ND_PRINT((ndo, " metric=%u", EXTRACT_32BITS(&bp[4])));
1012 break;
1013  
1014 case PIMV2_TYPE_CANDIDATE_RP:
1015 {
1016 int i, pfxcnt;
1017 bp += 4;
1018  
1019 /* Prefix-Cnt, Priority, and Holdtime */
1020 if (bp >= ep) break;
1021 ND_PRINT((ndo, " prefix-cnt=%d", bp[0]));
1022 pfxcnt = bp[0];
1023 if (bp + 1 >= ep) break;
1024 ND_PRINT((ndo, " prio=%d", bp[1]));
1025 if (bp + 3 >= ep) break;
1026 ND_PRINT((ndo, " holdtime="));
1027 relts_print(ndo, EXTRACT_16BITS(&bp[2]));
1028 bp += 4;
1029  
1030 /* Encoded-Unicast-RP-Address */
1031 if (bp >= ep) break;
1032 ND_PRINT((ndo, " RP="));
1033 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
1034 ND_PRINT((ndo, "..."));
1035 break;
1036 }
1037 bp += advance;
1038  
1039 /* Encoded-Group Addresses */
1040 for (i = 0; i < pfxcnt && bp < ep; i++) {
1041 ND_PRINT((ndo, " Group%d=", i));
1042 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0))
1043 < 0) {
1044 ND_PRINT((ndo, "..."));
1045 break;
1046 }
1047 bp += advance;
1048 }
1049 break;
1050 }
1051  
1052 case PIMV2_TYPE_PRUNE_REFRESH:
1053 ND_PRINT((ndo, " src="));
1054 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
1055 ND_PRINT((ndo, "..."));
1056 break;
1057 }
1058 bp += advance;
1059 ND_PRINT((ndo, " grp="));
1060 if ((advance = pimv2_addr_print(ndo, bp, pimv2_group, 0)) < 0) {
1061 ND_PRINT((ndo, "..."));
1062 break;
1063 }
1064 bp += advance;
1065 ND_PRINT((ndo, " forwarder="));
1066 if ((advance = pimv2_addr_print(ndo, bp, pimv2_unicast, 0)) < 0) {
1067 ND_PRINT((ndo, "..."));
1068 break;
1069 }
1070 bp += advance;
1071 ND_TCHECK2(bp[0], 2);
1072 ND_PRINT((ndo, " TUNR "));
1073 relts_print(ndo, EXTRACT_16BITS(bp));
1074 break;
1075  
1076  
1077 default:
1078 ND_PRINT((ndo, " [type %d]", PIM_TYPE(pim->pim_typever)));
1079 break;
1080 }
1081  
1082 return;
1083  
1084 trunc:
1085 ND_PRINT((ndo, "[|pim]"));
1086 }
1087  
1088 /*
1089 * Local Variables:
1090 * c-style: whitesmith
1091 * c-basic-offset: 8
1092 * End:
1093 */