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