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[tcpdump] / print-dhcp6.c
1 /*
2 * Copyright (C) 1998 and 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 /* \summary: IPv6 DHCP printer */
31
32 /*
33 * RFC3315: DHCPv6
34 * supported DHCPv6 options:
35 * RFC3319: Session Initiation Protocol (SIP) Servers options,
36 * RFC3633: IPv6 Prefix options,
37 * RFC3646: DNS Configuration options,
38 * RFC3898: Network Information Service (NIS) Configuration options,
39 * RFC4075: Simple Network Time Protocol (SNTP) Configuration option,
40 * RFC4242: Information Refresh Time option,
41 * RFC4280: Broadcast and Multicast Control Servers options,
42 * RFC5908: Network Time Protocol (NTP) Server Option for DHCPv6
43 * RFC6334: Dual-Stack Lite option,
44 */
45
46 #ifdef HAVE_CONFIG_H
47 #include "config.h"
48 #endif
49
50 #include <netdissect-stdinc.h>
51
52 #include <stdio.h>
53 #include <string.h>
54
55 #include "netdissect.h"
56 #include "addrtoname.h"
57 #include "extract.h"
58
59 /* lease duration */
60 #define DHCP6_DURATION_INFINITE 0xffffffff
61
62 /* Error Values */
63 #define DH6ERR_FAILURE 16
64 #define DH6ERR_AUTHFAIL 17
65 #define DH6ERR_POORLYFORMED 18
66 #define DH6ERR_UNAVAIL 19
67 #define DH6ERR_OPTUNAVAIL 20
68
69 /* Message type */
70 #define DH6_SOLICIT 1
71 #define DH6_ADVERTISE 2
72 #define DH6_REQUEST 3
73 #define DH6_CONFIRM 4
74 #define DH6_RENEW 5
75 #define DH6_REBIND 6
76 #define DH6_REPLY 7
77 #define DH6_RELEASE 8
78 #define DH6_DECLINE 9
79 #define DH6_RECONFIGURE 10
80 #define DH6_INFORM_REQ 11
81 #define DH6_RELAY_FORW 12
82 #define DH6_RELAY_REPLY 13
83 #define DH6_LEASEQUERY 14
84 #define DH6_LQ_REPLY 15
85
86 static const struct tok dh6_msgtype_str[] = {
87 { DH6_SOLICIT, "solicit" },
88 { DH6_ADVERTISE, "advertise" },
89 { DH6_REQUEST, "request" },
90 { DH6_CONFIRM, "confirm" },
91 { DH6_RENEW, "renew" },
92 { DH6_REBIND, "rebind" },
93 { DH6_REPLY, "reply" },
94 { DH6_RELEASE, "release" },
95 { DH6_DECLINE, "decline" },
96 { DH6_RECONFIGURE, "reconfigure" },
97 { DH6_INFORM_REQ, "inf-req" },
98 { DH6_RELAY_FORW, "relay-fwd" },
99 { DH6_RELAY_REPLY, "relay-reply" },
100 { DH6_LEASEQUERY, "leasequery" },
101 { DH6_LQ_REPLY, "leasequery-reply" },
102 { 0, NULL }
103 };
104
105 /* DHCP6 base packet format */
106 struct dhcp6 {
107 union {
108 uint8_t m;
109 uint32_t x;
110 } dh6_msgtypexid;
111 /* options follow */
112 };
113 #define dh6_msgtype dh6_msgtypexid.m
114 #define dh6_xid dh6_msgtypexid.x
115 #define DH6_XIDMASK 0x00ffffff
116
117 /* DHCPv6 relay messages */
118 struct dhcp6_relay {
119 uint8_t dh6relay_msgtype;
120 uint8_t dh6relay_hcnt;
121 uint8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */
122 uint8_t dh6relay_peeraddr[16];
123 /* options follow */
124 };
125
126 /* options */
127 #define DH6OPT_CLIENTID 1
128 #define DH6OPT_SERVERID 2
129 #define DH6OPT_IA_NA 3
130 #define DH6OPT_IA_TA 4
131 #define DH6OPT_IA_ADDR 5
132 #define DH6OPT_ORO 6
133 #define DH6OPT_PREFERENCE 7
134 # define DH6OPT_PREF_MAX 255
135 #define DH6OPT_ELAPSED_TIME 8
136 #define DH6OPT_RELAY_MSG 9
137 /*#define DH6OPT_SERVER_MSG 10 deprecated */
138 #define DH6OPT_AUTH 11
139 # define DH6OPT_AUTHPROTO_DELAYED 2
140 # define DH6OPT_AUTHPROTO_RECONFIG 3
141 # define DH6OPT_AUTHALG_HMACMD5 1
142 # define DH6OPT_AUTHRDM_MONOCOUNTER 0
143 # define DH6OPT_AUTHRECONFIG_KEY 1
144 # define DH6OPT_AUTHRECONFIG_HMACMD5 2
145 #define DH6OPT_UNICAST 12
146 #define DH6OPT_STATUS_CODE 13
147 # define DH6OPT_STCODE_SUCCESS 0
148 # define DH6OPT_STCODE_UNSPECFAIL 1
149 # define DH6OPT_STCODE_NOADDRAVAIL 2
150 # define DH6OPT_STCODE_NOBINDING 3
151 # define DH6OPT_STCODE_NOTONLINK 4
152 # define DH6OPT_STCODE_USEMULTICAST 5
153 # define DH6OPT_STCODE_NOPREFIXAVAIL 6
154 # define DH6OPT_STCODE_UNKNOWNQUERYTYPE 7
155 # define DH6OPT_STCODE_MALFORMEDQUERY 8
156 # define DH6OPT_STCODE_NOTCONFIGURED 9
157 # define DH6OPT_STCODE_NOTALLOWED 10
158 #define DH6OPT_RAPID_COMMIT 14
159 #define DH6OPT_USER_CLASS 15
160 #define DH6OPT_VENDOR_CLASS 16
161 #define DH6OPT_VENDOR_OPTS 17
162 #define DH6OPT_INTERFACE_ID 18
163 #define DH6OPT_RECONF_MSG 19
164 #define DH6OPT_RECONF_ACCEPT 20
165 #define DH6OPT_SIP_SERVER_D 21
166 #define DH6OPT_SIP_SERVER_A 22
167 #define DH6OPT_DNS_SERVERS 23
168 #define DH6OPT_DOMAIN_LIST 24
169 #define DH6OPT_IA_PD 25
170 #define DH6OPT_IA_PD_PREFIX 26
171 #define DH6OPT_NIS_SERVERS 27
172 #define DH6OPT_NISP_SERVERS 28
173 #define DH6OPT_NIS_NAME 29
174 #define DH6OPT_NISP_NAME 30
175 #define DH6OPT_SNTP_SERVERS 31
176 #define DH6OPT_LIFETIME 32
177 #define DH6OPT_BCMCS_SERVER_D 33
178 #define DH6OPT_BCMCS_SERVER_A 34
179 #define DH6OPT_GEOCONF_CIVIC 36
180 #define DH6OPT_REMOTE_ID 37
181 #define DH6OPT_SUBSCRIBER_ID 38
182 #define DH6OPT_CLIENT_FQDN 39
183 #define DH6OPT_PANA_AGENT 40
184 #define DH6OPT_NEW_POSIX_TIMEZONE 41
185 #define DH6OPT_NEW_TZDB_TIMEZONE 42
186 #define DH6OPT_ERO 43
187 #define DH6OPT_LQ_QUERY 44
188 #define DH6OPT_CLIENT_DATA 45
189 #define DH6OPT_CLT_TIME 46
190 #define DH6OPT_LQ_RELAY_DATA 47
191 #define DH6OPT_LQ_CLIENT_LINK 48
192 #define DH6OPT_NTP_SERVER 56
193 # define DH6OPT_NTP_SUBOPTION_SRV_ADDR 1
194 # define DH6OPT_NTP_SUBOPTION_MC_ADDR 2
195 # define DH6OPT_NTP_SUBOPTION_SRV_FQDN 3
196 #define DH6OPT_AFTR_NAME 64
197
198 static const struct tok dh6opt_str[] = {
199 { DH6OPT_CLIENTID, "client-ID" },
200 { DH6OPT_SERVERID, "server-ID" },
201 { DH6OPT_IA_NA, "IA_NA" },
202 { DH6OPT_IA_TA, "IA_TA" },
203 { DH6OPT_IA_ADDR, "IA_ADDR" },
204 { DH6OPT_ORO, "option-request" },
205 { DH6OPT_PREFERENCE, "preference" },
206 { DH6OPT_ELAPSED_TIME, "elapsed-time" },
207 { DH6OPT_RELAY_MSG, "relay-message" },
208 { DH6OPT_AUTH, "authentication" },
209 { DH6OPT_UNICAST, "server-unicast" },
210 { DH6OPT_STATUS_CODE, "status-code" },
211 { DH6OPT_RAPID_COMMIT, "rapid-commit" },
212 { DH6OPT_USER_CLASS, "user-class" },
213 { DH6OPT_VENDOR_CLASS, "vendor-class" },
214 { DH6OPT_VENDOR_OPTS, "vendor-specific-info" },
215 { DH6OPT_INTERFACE_ID, "interface-ID" },
216 { DH6OPT_RECONF_MSG, "reconfigure-message" },
217 { DH6OPT_RECONF_ACCEPT, "reconfigure-accept" },
218 { DH6OPT_SIP_SERVER_D, "SIP-servers-domain" },
219 { DH6OPT_SIP_SERVER_A, "SIP-servers-address" },
220 { DH6OPT_DNS_SERVERS, "DNS-server" },
221 { DH6OPT_DOMAIN_LIST, "DNS-search-list" },
222 { DH6OPT_IA_PD, "IA_PD" },
223 { DH6OPT_IA_PD_PREFIX, "IA_PD-prefix" },
224 { DH6OPT_SNTP_SERVERS, "SNTP-servers" },
225 { DH6OPT_LIFETIME, "lifetime" },
226 { DH6OPT_NIS_SERVERS, "NIS-server" },
227 { DH6OPT_NISP_SERVERS, "NIS+-server" },
228 { DH6OPT_NIS_NAME, "NIS-domain-name" },
229 { DH6OPT_NISP_NAME, "NIS+-domain-name" },
230 { DH6OPT_BCMCS_SERVER_D, "BCMCS-domain-name" },
231 { DH6OPT_BCMCS_SERVER_A, "BCMCS-server" },
232 { DH6OPT_GEOCONF_CIVIC, "Geoconf-Civic" },
233 { DH6OPT_REMOTE_ID, "Remote-ID" },
234 { DH6OPT_SUBSCRIBER_ID, "Subscriber-ID" },
235 { DH6OPT_CLIENT_FQDN, "Client-FQDN" },
236 { DH6OPT_PANA_AGENT, "PANA-agent" },
237 { DH6OPT_NEW_POSIX_TIMEZONE, "POSIX-timezone" },
238 { DH6OPT_NEW_TZDB_TIMEZONE, "POSIX-tz-database" },
239 { DH6OPT_ERO, "Echo-request-option" },
240 { DH6OPT_LQ_QUERY, "Lease-query" },
241 { DH6OPT_CLIENT_DATA, "LQ-client-data" },
242 { DH6OPT_CLT_TIME, "Clt-time" },
243 { DH6OPT_LQ_RELAY_DATA, "LQ-relay-data" },
244 { DH6OPT_LQ_CLIENT_LINK, "LQ-client-link" },
245 { DH6OPT_NTP_SERVER, "NTP-server" },
246 { DH6OPT_AFTR_NAME, "AFTR-Name" },
247 { 0, NULL }
248 };
249
250 static const struct tok dh6opt_stcode_str[] = {
251 { DH6OPT_STCODE_SUCCESS, "Success" }, /* RFC3315 */
252 { DH6OPT_STCODE_UNSPECFAIL, "UnspecFail" }, /* RFC3315 */
253 { DH6OPT_STCODE_NOADDRAVAIL, "NoAddrsAvail" }, /* RFC3315 */
254 { DH6OPT_STCODE_NOBINDING, "NoBinding" }, /* RFC3315 */
255 { DH6OPT_STCODE_NOTONLINK, "NotOnLink" }, /* RFC3315 */
256 { DH6OPT_STCODE_USEMULTICAST, "UseMulticast" }, /* RFC3315 */
257 { DH6OPT_STCODE_NOPREFIXAVAIL, "NoPrefixAvail" }, /* RFC3633 */
258 { DH6OPT_STCODE_UNKNOWNQUERYTYPE, "UnknownQueryType" }, /* RFC5007 */
259 { DH6OPT_STCODE_MALFORMEDQUERY, "MalformedQuery" }, /* RFC5007 */
260 { DH6OPT_STCODE_NOTCONFIGURED, "NotConfigured" }, /* RFC5007 */
261 { DH6OPT_STCODE_NOTALLOWED, "NotAllowed" }, /* RFC5007 */
262 { 0, NULL }
263 };
264
265 struct dhcp6opt {
266 uint16_t dh6opt_type;
267 uint16_t dh6opt_len;
268 /* type-dependent data follows */
269 };
270
271 static const char *
272 dhcp6stcode(const uint16_t code)
273 {
274 return code > 255 ? "INVALID code" : tok2str(dh6opt_stcode_str, "code%u", code);
275 }
276
277 static void
278 dhcp6opt_print(netdissect_options *ndo,
279 const u_char *cp, const u_char *ep)
280 {
281 const struct dhcp6opt *dh6o;
282 const u_char *tp;
283 size_t i;
284 uint16_t opttype;
285 size_t optlen;
286 uint8_t auth_proto;
287 u_int authinfolen, authrealmlen;
288 int remain_len; /* Length of remaining options */
289 int label_len; /* Label length */
290 uint16_t subopt_code;
291 uint16_t subopt_len;
292
293 if (cp == ep)
294 return;
295 while (cp < ep) {
296 if (ep < cp + sizeof(*dh6o))
297 goto trunc;
298 dh6o = (const struct dhcp6opt *)cp;
299 ND_TCHECK(*dh6o);
300 optlen = EXTRACT_16BITS(&dh6o->dh6opt_len);
301 if (ep < cp + sizeof(*dh6o) + optlen)
302 goto trunc;
303 opttype = EXTRACT_16BITS(&dh6o->dh6opt_type);
304 ND_PRINT((ndo, " (%s", tok2str(dh6opt_str, "opt_%u", opttype)));
305 switch (opttype) {
306 case DH6OPT_CLIENTID:
307 case DH6OPT_SERVERID:
308 if (optlen < 2) {
309 /*(*/
310 ND_PRINT((ndo, " ?)"));
311 break;
312 }
313 tp = (const u_char *)(dh6o + 1);
314 switch (EXTRACT_16BITS(tp)) {
315 case 1:
316 if (optlen >= 2 + 6) {
317 ND_PRINT((ndo, " hwaddr/time type %u time %u ",
318 EXTRACT_16BITS(&tp[2]),
319 EXTRACT_32BITS(&tp[4])));
320 for (i = 8; i < optlen; i++)
321 ND_PRINT((ndo, "%02x", tp[i]));
322 /*(*/
323 ND_PRINT((ndo, ")"));
324 } else {
325 /*(*/
326 ND_PRINT((ndo, " ?)"));
327 }
328 break;
329 case 2:
330 if (optlen >= 2 + 8) {
331 ND_PRINT((ndo, " vid "));
332 for (i = 2; i < 2 + 8; i++)
333 ND_PRINT((ndo, "%02x", tp[i]));
334 /*(*/
335 ND_PRINT((ndo, ")"));
336 } else {
337 /*(*/
338 ND_PRINT((ndo, " ?)"));
339 }
340 break;
341 case 3:
342 if (optlen >= 2 + 2) {
343 ND_PRINT((ndo, " hwaddr type %u ",
344 EXTRACT_16BITS(&tp[2])));
345 for (i = 4; i < optlen; i++)
346 ND_PRINT((ndo, "%02x", tp[i]));
347 /*(*/
348 ND_PRINT((ndo, ")"));
349 } else {
350 /*(*/
351 ND_PRINT((ndo, " ?)"));
352 }
353 break;
354 default:
355 ND_PRINT((ndo, " type %d)", EXTRACT_16BITS(tp)));
356 break;
357 }
358 break;
359 case DH6OPT_IA_ADDR:
360 if (optlen < 24) {
361 /*(*/
362 ND_PRINT((ndo, " ?)"));
363 break;
364 }
365 tp = (const u_char *)(dh6o + 1);
366 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0])));
367 ND_PRINT((ndo, " pltime:%u vltime:%u",
368 EXTRACT_32BITS(&tp[16]),
369 EXTRACT_32BITS(&tp[20])));
370 if (optlen > 24) {
371 /* there are sub-options */
372 dhcp6opt_print(ndo, tp + 24, tp + optlen);
373 }
374 ND_PRINT((ndo, ")"));
375 break;
376 case DH6OPT_ORO:
377 case DH6OPT_ERO:
378 if (optlen % 2) {
379 ND_PRINT((ndo, " ?)"));
380 break;
381 }
382 tp = (const u_char *)(dh6o + 1);
383 for (i = 0; i < optlen; i += 2) {
384 ND_PRINT((ndo, " %s",
385 tok2str(dh6opt_str, "opt_%u", EXTRACT_16BITS(&tp[i]))));
386 }
387 ND_PRINT((ndo, ")"));
388 break;
389 case DH6OPT_PREFERENCE:
390 if (optlen != 1) {
391 ND_PRINT((ndo, " ?)"));
392 break;
393 }
394 tp = (const u_char *)(dh6o + 1);
395 ND_PRINT((ndo, " %d)", *tp));
396 break;
397 case DH6OPT_ELAPSED_TIME:
398 if (optlen != 2) {
399 ND_PRINT((ndo, " ?)"));
400 break;
401 }
402 tp = (const u_char *)(dh6o + 1);
403 ND_PRINT((ndo, " %d)", EXTRACT_16BITS(tp)));
404 break;
405 case DH6OPT_RELAY_MSG:
406 ND_PRINT((ndo, " ("));
407 tp = (const u_char *)(dh6o + 1);
408 dhcp6_print(ndo, tp, optlen);
409 ND_PRINT((ndo, ")"));
410 break;
411 case DH6OPT_AUTH:
412 if (optlen < 11) {
413 ND_PRINT((ndo, " ?)"));
414 break;
415 }
416 tp = (const u_char *)(dh6o + 1);
417 auth_proto = *tp;
418 switch (auth_proto) {
419 case DH6OPT_AUTHPROTO_DELAYED:
420 ND_PRINT((ndo, " proto: delayed"));
421 break;
422 case DH6OPT_AUTHPROTO_RECONFIG:
423 ND_PRINT((ndo, " proto: reconfigure"));
424 break;
425 default:
426 ND_PRINT((ndo, " proto: %d", auth_proto));
427 break;
428 }
429 tp++;
430 switch (*tp) {
431 case DH6OPT_AUTHALG_HMACMD5:
432 /* XXX: may depend on the protocol */
433 ND_PRINT((ndo, ", alg: HMAC-MD5"));
434 break;
435 default:
436 ND_PRINT((ndo, ", alg: %d", *tp));
437 break;
438 }
439 tp++;
440 switch (*tp) {
441 case DH6OPT_AUTHRDM_MONOCOUNTER:
442 ND_PRINT((ndo, ", RDM: mono"));
443 break;
444 default:
445 ND_PRINT((ndo, ", RDM: %d", *tp));
446 break;
447 }
448 tp++;
449 ND_PRINT((ndo, ", RD:"));
450 for (i = 0; i < 4; i++, tp += 2)
451 ND_PRINT((ndo, " %04x", EXTRACT_16BITS(tp)));
452
453 /* protocol dependent part */
454 authinfolen = optlen - 11;
455 switch (auth_proto) {
456 case DH6OPT_AUTHPROTO_DELAYED:
457 if (authinfolen == 0)
458 break;
459 if (authinfolen < 20) {
460 ND_PRINT((ndo, " ??"));
461 break;
462 }
463 authrealmlen = authinfolen - 20;
464 if (authrealmlen > 0) {
465 ND_PRINT((ndo, ", realm: "));
466 }
467 for (i = 0; i < authrealmlen; i++, tp++)
468 ND_PRINT((ndo, "%02x", *tp));
469 ND_PRINT((ndo, ", key ID: %08x", EXTRACT_32BITS(tp)));
470 tp += 4;
471 ND_PRINT((ndo, ", HMAC-MD5:"));
472 for (i = 0; i < 4; i++, tp+= 4)
473 ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tp)));
474 break;
475 case DH6OPT_AUTHPROTO_RECONFIG:
476 if (authinfolen != 17) {
477 ND_PRINT((ndo, " ??"));
478 break;
479 }
480 switch (*tp++) {
481 case DH6OPT_AUTHRECONFIG_KEY:
482 ND_PRINT((ndo, " reconfig-key"));
483 break;
484 case DH6OPT_AUTHRECONFIG_HMACMD5:
485 ND_PRINT((ndo, " type: HMAC-MD5"));
486 break;
487 default:
488 ND_PRINT((ndo, " type: ??"));
489 break;
490 }
491 ND_PRINT((ndo, " value:"));
492 for (i = 0; i < 4; i++, tp+= 4)
493 ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tp)));
494 break;
495 default:
496 ND_PRINT((ndo, " ??"));
497 break;
498 }
499
500 ND_PRINT((ndo, ")"));
501 break;
502 case DH6OPT_RAPID_COMMIT: /* nothing todo */
503 ND_PRINT((ndo, ")"));
504 break;
505 case DH6OPT_INTERFACE_ID:
506 case DH6OPT_SUBSCRIBER_ID:
507 /*
508 * Since we cannot predict the encoding, print hex dump
509 * at most 10 characters.
510 */
511 tp = (const u_char *)(dh6o + 1);
512 ND_PRINT((ndo, " "));
513 for (i = 0; i < optlen && i < 10; i++)
514 ND_PRINT((ndo, "%02x", tp[i]));
515 ND_PRINT((ndo, "...)"));
516 break;
517 case DH6OPT_RECONF_MSG:
518 tp = (const u_char *)(dh6o + 1);
519 switch (*tp) {
520 case DH6_RENEW:
521 ND_PRINT((ndo, " for renew)"));
522 break;
523 case DH6_INFORM_REQ:
524 ND_PRINT((ndo, " for inf-req)"));
525 break;
526 default:
527 ND_PRINT((ndo, " for ?\?\?(%02x))", *tp));
528 break;
529 }
530 break;
531 case DH6OPT_RECONF_ACCEPT: /* nothing todo */
532 ND_PRINT((ndo, ")"));
533 break;
534 case DH6OPT_SIP_SERVER_A:
535 case DH6OPT_DNS_SERVERS:
536 case DH6OPT_SNTP_SERVERS:
537 case DH6OPT_NIS_SERVERS:
538 case DH6OPT_NISP_SERVERS:
539 case DH6OPT_BCMCS_SERVER_A:
540 case DH6OPT_PANA_AGENT:
541 case DH6OPT_LQ_CLIENT_LINK:
542 if (optlen % 16) {
543 ND_PRINT((ndo, " ?)"));
544 break;
545 }
546 tp = (const u_char *)(dh6o + 1);
547 for (i = 0; i < optlen; i += 16)
548 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[i])));
549 ND_PRINT((ndo, ")"));
550 break;
551 case DH6OPT_SIP_SERVER_D:
552 case DH6OPT_DOMAIN_LIST:
553 tp = (const u_char *)(dh6o + 1);
554 while (tp < cp + sizeof(*dh6o) + optlen) {
555 ND_PRINT((ndo, " "));
556 if ((tp = ns_nprint(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL)
557 goto trunc;
558 }
559 ND_PRINT((ndo, ")"));
560 break;
561 case DH6OPT_STATUS_CODE:
562 if (optlen < 2) {
563 ND_PRINT((ndo, " ?)"));
564 break;
565 }
566 tp = (const u_char *)(dh6o + 1);
567 ND_PRINT((ndo, " %s)", dhcp6stcode(EXTRACT_16BITS(&tp[0]))));
568 break;
569 case DH6OPT_IA_NA:
570 case DH6OPT_IA_PD:
571 if (optlen < 12) {
572 ND_PRINT((ndo, " ?)"));
573 break;
574 }
575 tp = (const u_char *)(dh6o + 1);
576 ND_PRINT((ndo, " IAID:%u T1:%u T2:%u",
577 EXTRACT_32BITS(&tp[0]),
578 EXTRACT_32BITS(&tp[4]),
579 EXTRACT_32BITS(&tp[8])));
580 if (optlen > 12) {
581 /* there are sub-options */
582 dhcp6opt_print(ndo, tp + 12, tp + optlen);
583 }
584 ND_PRINT((ndo, ")"));
585 break;
586 case DH6OPT_IA_TA:
587 if (optlen < 4) {
588 ND_PRINT((ndo, " ?)"));
589 break;
590 }
591 tp = (const u_char *)(dh6o + 1);
592 ND_PRINT((ndo, " IAID:%u", EXTRACT_32BITS(tp)));
593 if (optlen > 4) {
594 /* there are sub-options */
595 dhcp6opt_print(ndo, tp + 4, tp + optlen);
596 }
597 ND_PRINT((ndo, ")"));
598 break;
599 case DH6OPT_IA_PD_PREFIX:
600 if (optlen < 25) {
601 ND_PRINT((ndo, " ?)"));
602 break;
603 }
604 tp = (const u_char *)(dh6o + 1);
605 ND_PRINT((ndo, " %s/%d", ip6addr_string(ndo, &tp[9]), tp[8]));
606 ND_PRINT((ndo, " pltime:%u vltime:%u",
607 EXTRACT_32BITS(&tp[0]),
608 EXTRACT_32BITS(&tp[4])));
609 if (optlen > 25) {
610 /* there are sub-options */
611 dhcp6opt_print(ndo, tp + 25, tp + optlen);
612 }
613 ND_PRINT((ndo, ")"));
614 break;
615 case DH6OPT_LIFETIME:
616 case DH6OPT_CLT_TIME:
617 if (optlen != 4) {
618 ND_PRINT((ndo, " ?)"));
619 break;
620 }
621 tp = (const u_char *)(dh6o + 1);
622 ND_PRINT((ndo, " %d)", EXTRACT_32BITS(tp)));
623 break;
624 case DH6OPT_REMOTE_ID:
625 if (optlen < 4) {
626 ND_PRINT((ndo, " ?)"));
627 break;
628 }
629 tp = (const u_char *)(dh6o + 1);
630 ND_PRINT((ndo, " %d ", EXTRACT_32BITS(tp)));
631 /*
632 * Print hex dump first 10 characters.
633 */
634 for (i = 4; i < optlen && i < 14; i++)
635 ND_PRINT((ndo, "%02x", tp[i]));
636 ND_PRINT((ndo, "...)"));
637 break;
638 case DH6OPT_LQ_QUERY:
639 if (optlen < 17) {
640 ND_PRINT((ndo, " ?)"));
641 break;
642 }
643 tp = (const u_char *)(dh6o + 1);
644 switch (*tp) {
645 case 1:
646 ND_PRINT((ndo, " by-address"));
647 break;
648 case 2:
649 ND_PRINT((ndo, " by-clientID"));
650 break;
651 default:
652 ND_PRINT((ndo, " type_%d", (int)*tp));
653 break;
654 }
655 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[1])));
656 if (optlen > 17) {
657 /* there are query-options */
658 dhcp6opt_print(ndo, tp + 17, tp + optlen);
659 }
660 ND_PRINT((ndo, ")"));
661 break;
662 case DH6OPT_CLIENT_DATA:
663 tp = (const u_char *)(dh6o + 1);
664 if (optlen > 0) {
665 /* there are encapsulated options */
666 dhcp6opt_print(ndo, tp, tp + optlen);
667 }
668 ND_PRINT((ndo, ")"));
669 break;
670 case DH6OPT_LQ_RELAY_DATA:
671 if (optlen < 16) {
672 ND_PRINT((ndo, " ?)"));
673 break;
674 }
675 tp = (const u_char *)(dh6o + 1);
676 ND_PRINT((ndo, " %s ", ip6addr_string(ndo, &tp[0])));
677 /*
678 * Print hex dump first 10 characters.
679 */
680 for (i = 16; i < optlen && i < 26; i++)
681 ND_PRINT((ndo, "%02x", tp[i]));
682 ND_PRINT((ndo, "...)"));
683 break;
684 case DH6OPT_NTP_SERVER:
685 if (optlen < 4) {
686 ND_PRINT((ndo, " ?)"));
687 break;
688 }
689 tp = (const u_char *)(dh6o + 1);
690 while (tp < cp + sizeof(*dh6o) + optlen - 4) {
691 subopt_code = EXTRACT_16BITS(tp);
692 tp += 2;
693 subopt_len = EXTRACT_16BITS(tp);
694 tp += 2;
695 if (tp + subopt_len > cp + sizeof(*dh6o) + optlen)
696 goto trunc;
697 ND_PRINT((ndo, " subopt:%d", subopt_code));
698 switch (subopt_code) {
699 case DH6OPT_NTP_SUBOPTION_SRV_ADDR:
700 case DH6OPT_NTP_SUBOPTION_MC_ADDR:
701 if (subopt_len != 16) {
702 ND_PRINT((ndo, " ?"));
703 break;
704 }
705 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0])));
706 break;
707 case DH6OPT_NTP_SUBOPTION_SRV_FQDN:
708 ND_PRINT((ndo, " "));
709 if (ns_nprint(ndo, tp, tp + subopt_len) == NULL)
710 goto trunc;
711 break;
712 default:
713 ND_PRINT((ndo, " ?"));
714 break;
715 }
716 tp += subopt_len;
717 }
718 ND_PRINT((ndo, ")"));
719 break;
720 case DH6OPT_AFTR_NAME:
721 if (optlen < 3) {
722 ND_PRINT((ndo, " ?)"));
723 break;
724 }
725 tp = (const u_char *)(dh6o + 1);
726 remain_len = optlen;
727 ND_PRINT((ndo, " "));
728 /* Encoding is described in section 3.1 of RFC 1035 */
729 while (remain_len && *tp) {
730 label_len = *tp++;
731 if (label_len < remain_len - 1) {
732 ND_PRINT((ndo, "%.*s", label_len, tp));
733 tp += label_len;
734 remain_len -= (label_len + 1);
735 if(*tp) ND_PRINT((ndo, "."));
736 } else {
737 ND_PRINT((ndo, " ?"));
738 break;
739 }
740 }
741 ND_PRINT((ndo, ")"));
742 break;
743 default:
744 ND_PRINT((ndo, ")"));
745 break;
746 }
747
748 cp += sizeof(*dh6o) + optlen;
749 }
750 return;
751
752 trunc:
753 ND_PRINT((ndo, "[|dhcp6ext]"));
754 }
755
756 /*
757 * Print dhcp6 packets
758 */
759 void
760 dhcp6_print(netdissect_options *ndo,
761 const u_char *cp, u_int length)
762 {
763 const struct dhcp6 *dh6;
764 const struct dhcp6_relay *dh6relay;
765 const u_char *ep;
766 const u_char *extp;
767 const char *name;
768
769 ND_PRINT((ndo, "dhcp6"));
770
771 ep = (const u_char *)ndo->ndo_snapend;
772 if (cp + length < ep)
773 ep = cp + length;
774
775 dh6 = (const struct dhcp6 *)cp;
776 dh6relay = (const struct dhcp6_relay *)cp;
777 ND_TCHECK(dh6->dh6_xid);
778 name = tok2str(dh6_msgtype_str, "msgtype-%u", dh6->dh6_msgtype);
779
780 if (!ndo->ndo_vflag) {
781 ND_PRINT((ndo, " %s", name));
782 return;
783 }
784
785 /* XXX relay agent messages have to be handled differently */
786
787 ND_PRINT((ndo, " %s (", name)); /*)*/
788 if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
789 dh6->dh6_msgtype != DH6_RELAY_REPLY) {
790 ND_PRINT((ndo, "xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK));
791 extp = (const u_char *)(dh6 + 1);
792 dhcp6opt_print(ndo, extp, ep);
793 } else { /* relay messages */
794 struct in6_addr addr6;
795
796 ND_TCHECK(dh6relay->dh6relay_peeraddr);
797
798 memcpy(&addr6, dh6relay->dh6relay_linkaddr, sizeof (addr6));
799 ND_PRINT((ndo, "linkaddr=%s", ip6addr_string(ndo, &addr6)));
800
801 memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6));
802 ND_PRINT((ndo, " peeraddr=%s", ip6addr_string(ndo, &addr6)));
803
804 dhcp6opt_print(ndo, (const u_char *)(dh6relay + 1), ep);
805 }
806 /*(*/
807 ND_PRINT((ndo, ")"));
808 return;
809
810 trunc:
811 ND_PRINT((ndo, "[|dhcp6]"));
812 }
[mirror] the TCPdump network dissector