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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 nd_uint8_t m;
109 nd_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 nd_uint8_t dh6relay_msgtype;
120 nd_uint8_t dh6relay_hcnt;
121 nd_uint8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */
122 nd_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 #define DH6OPT_MUDURL 112
198
199 static const struct tok dh6opt_str[] = {
200 { DH6OPT_CLIENTID, "client-ID" },
201 { DH6OPT_SERVERID, "server-ID" },
202 { DH6OPT_IA_NA, "IA_NA" },
203 { DH6OPT_IA_TA, "IA_TA" },
204 { DH6OPT_IA_ADDR, "IA_ADDR" },
205 { DH6OPT_ORO, "option-request" },
206 { DH6OPT_PREFERENCE, "preference" },
207 { DH6OPT_ELAPSED_TIME, "elapsed-time" },
208 { DH6OPT_RELAY_MSG, "relay-message" },
209 { DH6OPT_AUTH, "authentication" },
210 { DH6OPT_UNICAST, "server-unicast" },
211 { DH6OPT_STATUS_CODE, "status-code" },
212 { DH6OPT_RAPID_COMMIT, "rapid-commit" },
213 { DH6OPT_USER_CLASS, "user-class" },
214 { DH6OPT_VENDOR_CLASS, "vendor-class" },
215 { DH6OPT_VENDOR_OPTS, "vendor-specific-info" },
216 { DH6OPT_INTERFACE_ID, "interface-ID" },
217 { DH6OPT_RECONF_MSG, "reconfigure-message" },
218 { DH6OPT_RECONF_ACCEPT, "reconfigure-accept" },
219 { DH6OPT_SIP_SERVER_D, "SIP-servers-domain" },
220 { DH6OPT_SIP_SERVER_A, "SIP-servers-address" },
221 { DH6OPT_DNS_SERVERS, "DNS-server" },
222 { DH6OPT_DOMAIN_LIST, "DNS-search-list" },
223 { DH6OPT_IA_PD, "IA_PD" },
224 { DH6OPT_IA_PD_PREFIX, "IA_PD-prefix" },
225 { DH6OPT_SNTP_SERVERS, "SNTP-servers" },
226 { DH6OPT_LIFETIME, "lifetime" },
227 { DH6OPT_NIS_SERVERS, "NIS-server" },
228 { DH6OPT_NISP_SERVERS, "NIS+-server" },
229 { DH6OPT_NIS_NAME, "NIS-domain-name" },
230 { DH6OPT_NISP_NAME, "NIS+-domain-name" },
231 { DH6OPT_BCMCS_SERVER_D, "BCMCS-domain-name" },
232 { DH6OPT_BCMCS_SERVER_A, "BCMCS-server" },
233 { DH6OPT_GEOCONF_CIVIC, "Geoconf-Civic" },
234 { DH6OPT_REMOTE_ID, "Remote-ID" },
235 { DH6OPT_SUBSCRIBER_ID, "Subscriber-ID" },
236 { DH6OPT_CLIENT_FQDN, "Client-FQDN" },
237 { DH6OPT_PANA_AGENT, "PANA-agent" },
238 { DH6OPT_NEW_POSIX_TIMEZONE, "POSIX-timezone" },
239 { DH6OPT_NEW_TZDB_TIMEZONE, "POSIX-tz-database" },
240 { DH6OPT_ERO, "Echo-request-option" },
241 { DH6OPT_LQ_QUERY, "Lease-query" },
242 { DH6OPT_CLIENT_DATA, "LQ-client-data" },
243 { DH6OPT_CLT_TIME, "Clt-time" },
244 { DH6OPT_LQ_RELAY_DATA, "LQ-relay-data" },
245 { DH6OPT_LQ_CLIENT_LINK, "LQ-client-link" },
246 { DH6OPT_NTP_SERVER, "NTP-server" },
247 { DH6OPT_AFTR_NAME, "AFTR-Name" },
248 { DH6OPT_MUDURL, "MUD-URL" },
249 { 0, NULL }
250 };
251
252 static const struct tok dh6opt_stcode_str[] = {
253 { DH6OPT_STCODE_SUCCESS, "Success" }, /* RFC3315 */
254 { DH6OPT_STCODE_UNSPECFAIL, "UnspecFail" }, /* RFC3315 */
255 { DH6OPT_STCODE_NOADDRAVAIL, "NoAddrsAvail" }, /* RFC3315 */
256 { DH6OPT_STCODE_NOBINDING, "NoBinding" }, /* RFC3315 */
257 { DH6OPT_STCODE_NOTONLINK, "NotOnLink" }, /* RFC3315 */
258 { DH6OPT_STCODE_USEMULTICAST, "UseMulticast" }, /* RFC3315 */
259 { DH6OPT_STCODE_NOPREFIXAVAIL, "NoPrefixAvail" }, /* RFC3633 */
260 { DH6OPT_STCODE_UNKNOWNQUERYTYPE, "UnknownQueryType" }, /* RFC5007 */
261 { DH6OPT_STCODE_MALFORMEDQUERY, "MalformedQuery" }, /* RFC5007 */
262 { DH6OPT_STCODE_NOTCONFIGURED, "NotConfigured" }, /* RFC5007 */
263 { DH6OPT_STCODE_NOTALLOWED, "NotAllowed" }, /* RFC5007 */
264 { 0, NULL }
265 };
266
267 struct dhcp6opt {
268 nd_uint16_t dh6opt_type;
269 nd_uint16_t dh6opt_len;
270 /* type-dependent data follows */
271 };
272
273 static const char *
274 dhcp6stcode(const uint16_t code)
275 {
276 return code > 255 ? "INVALID code" : tok2str(dh6opt_stcode_str, "code%u", code);
277 }
278
279 static void
280 dhcp6opt_print(netdissect_options *ndo,
281 const u_char *cp, const u_char *ep)
282 {
283 const struct dhcp6opt *dh6o;
284 const u_char *tp;
285 size_t i;
286 uint16_t opttype;
287 size_t optlen;
288 uint8_t auth_proto;
289 u_int authinfolen, authrealmlen;
290 int remain_len; /* Length of remaining options */
291 int label_len; /* Label length */
292 uint16_t subopt_code;
293 uint16_t subopt_len;
294
295 if (cp == ep)
296 return;
297 while (cp < ep) {
298 if (ep < cp + sizeof(*dh6o))
299 goto trunc;
300 dh6o = (const struct dhcp6opt *)cp;
301 ND_TCHECK(*dh6o);
302 optlen = EXTRACT_16BITS(&dh6o->dh6opt_len);
303 if (ep < cp + sizeof(*dh6o) + optlen)
304 goto trunc;
305 opttype = EXTRACT_16BITS(&dh6o->dh6opt_type);
306 ND_PRINT((ndo, " (%s", tok2str(dh6opt_str, "opt_%u", opttype)));
307 ND_TCHECK2(*(cp + sizeof(*dh6o)), optlen);
308 switch (opttype) {
309 case DH6OPT_CLIENTID:
310 case DH6OPT_SERVERID:
311 if (optlen < 2) {
312 /*(*/
313 ND_PRINT((ndo, " ?)"));
314 break;
315 }
316 tp = (const u_char *)(dh6o + 1);
317 switch (EXTRACT_16BITS(tp)) {
318 case 1:
319 if (optlen >= 2 + 6) {
320 ND_PRINT((ndo, " hwaddr/time type %u time %u ",
321 EXTRACT_16BITS(&tp[2]),
322 EXTRACT_32BITS(&tp[4])));
323 for (i = 8; i < optlen; i++)
324 ND_PRINT((ndo, "%02x", tp[i]));
325 /*(*/
326 ND_PRINT((ndo, ")"));
327 } else {
328 /*(*/
329 ND_PRINT((ndo, " ?)"));
330 }
331 break;
332 case 2:
333 if (optlen >= 2 + 8) {
334 ND_PRINT((ndo, " vid "));
335 for (i = 2; i < 2 + 8; i++)
336 ND_PRINT((ndo, "%02x", tp[i]));
337 /*(*/
338 ND_PRINT((ndo, ")"));
339 } else {
340 /*(*/
341 ND_PRINT((ndo, " ?)"));
342 }
343 break;
344 case 3:
345 if (optlen >= 2 + 2) {
346 ND_PRINT((ndo, " hwaddr type %u ",
347 EXTRACT_16BITS(&tp[2])));
348 for (i = 4; i < optlen; i++)
349 ND_PRINT((ndo, "%02x", tp[i]));
350 /*(*/
351 ND_PRINT((ndo, ")"));
352 } else {
353 /*(*/
354 ND_PRINT((ndo, " ?)"));
355 }
356 break;
357 default:
358 ND_PRINT((ndo, " type %d)", EXTRACT_16BITS(tp)));
359 break;
360 }
361 break;
362 case DH6OPT_IA_ADDR:
363 if (optlen < 24) {
364 /*(*/
365 ND_PRINT((ndo, " ?)"));
366 break;
367 }
368 tp = (const u_char *)(dh6o + 1);
369 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0])));
370 ND_PRINT((ndo, " pltime:%u vltime:%u",
371 EXTRACT_32BITS(&tp[16]),
372 EXTRACT_32BITS(&tp[20])));
373 if (optlen > 24) {
374 /* there are sub-options */
375 dhcp6opt_print(ndo, tp + 24, tp + optlen);
376 }
377 ND_PRINT((ndo, ")"));
378 break;
379 case DH6OPT_ORO:
380 case DH6OPT_ERO:
381 if (optlen % 2) {
382 ND_PRINT((ndo, " ?)"));
383 break;
384 }
385 tp = (const u_char *)(dh6o + 1);
386 for (i = 0; i < optlen; i += 2) {
387 ND_PRINT((ndo, " %s",
388 tok2str(dh6opt_str, "opt_%u", EXTRACT_16BITS(&tp[i]))));
389 }
390 ND_PRINT((ndo, ")"));
391 break;
392 case DH6OPT_PREFERENCE:
393 if (optlen != 1) {
394 ND_PRINT((ndo, " ?)"));
395 break;
396 }
397 tp = (const u_char *)(dh6o + 1);
398 ND_PRINT((ndo, " %d)", *tp));
399 break;
400 case DH6OPT_ELAPSED_TIME:
401 if (optlen != 2) {
402 ND_PRINT((ndo, " ?)"));
403 break;
404 }
405 tp = (const u_char *)(dh6o + 1);
406 ND_PRINT((ndo, " %d)", EXTRACT_16BITS(tp)));
407 break;
408 case DH6OPT_RELAY_MSG:
409 ND_PRINT((ndo, " ("));
410 tp = (const u_char *)(dh6o + 1);
411 dhcp6_print(ndo, tp, optlen);
412 ND_PRINT((ndo, ")"));
413 break;
414 case DH6OPT_AUTH:
415 if (optlen < 11) {
416 ND_PRINT((ndo, " ?)"));
417 break;
418 }
419 tp = (const u_char *)(dh6o + 1);
420 auth_proto = *tp;
421 switch (auth_proto) {
422 case DH6OPT_AUTHPROTO_DELAYED:
423 ND_PRINT((ndo, " proto: delayed"));
424 break;
425 case DH6OPT_AUTHPROTO_RECONFIG:
426 ND_PRINT((ndo, " proto: reconfigure"));
427 break;
428 default:
429 ND_PRINT((ndo, " proto: %d", auth_proto));
430 break;
431 }
432 tp++;
433 switch (*tp) {
434 case DH6OPT_AUTHALG_HMACMD5:
435 /* XXX: may depend on the protocol */
436 ND_PRINT((ndo, ", alg: HMAC-MD5"));
437 break;
438 default:
439 ND_PRINT((ndo, ", alg: %d", *tp));
440 break;
441 }
442 tp++;
443 switch (*tp) {
444 case DH6OPT_AUTHRDM_MONOCOUNTER:
445 ND_PRINT((ndo, ", RDM: mono"));
446 break;
447 default:
448 ND_PRINT((ndo, ", RDM: %d", *tp));
449 break;
450 }
451 tp++;
452 ND_PRINT((ndo, ", RD:"));
453 for (i = 0; i < 4; i++, tp += 2)
454 ND_PRINT((ndo, " %04x", EXTRACT_16BITS(tp)));
455
456 /* protocol dependent part */
457 authinfolen = optlen - 11;
458 switch (auth_proto) {
459 case DH6OPT_AUTHPROTO_DELAYED:
460 if (authinfolen == 0)
461 break;
462 if (authinfolen < 20) {
463 ND_PRINT((ndo, " ??"));
464 break;
465 }
466 authrealmlen = authinfolen - 20;
467 if (authrealmlen > 0) {
468 ND_PRINT((ndo, ", realm: "));
469 }
470 for (i = 0; i < authrealmlen; i++, tp++)
471 ND_PRINT((ndo, "%02x", *tp));
472 ND_PRINT((ndo, ", key ID: %08x", EXTRACT_32BITS(tp)));
473 tp += 4;
474 ND_PRINT((ndo, ", HMAC-MD5:"));
475 for (i = 0; i < 4; i++, tp+= 4)
476 ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tp)));
477 break;
478 case DH6OPT_AUTHPROTO_RECONFIG:
479 if (authinfolen != 17) {
480 ND_PRINT((ndo, " ??"));
481 break;
482 }
483 switch (*tp++) {
484 case DH6OPT_AUTHRECONFIG_KEY:
485 ND_PRINT((ndo, " reconfig-key"));
486 break;
487 case DH6OPT_AUTHRECONFIG_HMACMD5:
488 ND_PRINT((ndo, " type: HMAC-MD5"));
489 break;
490 default:
491 ND_PRINT((ndo, " type: ??"));
492 break;
493 }
494 ND_PRINT((ndo, " value:"));
495 for (i = 0; i < 4; i++, tp+= 4)
496 ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tp)));
497 break;
498 default:
499 ND_PRINT((ndo, " ??"));
500 break;
501 }
502
503 ND_PRINT((ndo, ")"));
504 break;
505 case DH6OPT_RAPID_COMMIT: /* nothing todo */
506 ND_PRINT((ndo, ")"));
507 break;
508 case DH6OPT_INTERFACE_ID:
509 case DH6OPT_SUBSCRIBER_ID:
510 /*
511 * Since we cannot predict the encoding, print hex dump
512 * at most 10 characters.
513 */
514 tp = (const u_char *)(dh6o + 1);
515 ND_PRINT((ndo, " "));
516 for (i = 0; i < optlen && i < 10; i++)
517 ND_PRINT((ndo, "%02x", tp[i]));
518 ND_PRINT((ndo, "...)"));
519 break;
520 case DH6OPT_RECONF_MSG:
521 tp = (const u_char *)(dh6o + 1);
522 switch (*tp) {
523 case DH6_RENEW:
524 ND_PRINT((ndo, " for renew)"));
525 break;
526 case DH6_INFORM_REQ:
527 ND_PRINT((ndo, " for inf-req)"));
528 break;
529 default:
530 ND_PRINT((ndo, " for ?\?\?(%02x))", *tp));
531 break;
532 }
533 break;
534 case DH6OPT_RECONF_ACCEPT: /* nothing todo */
535 ND_PRINT((ndo, ")"));
536 break;
537 case DH6OPT_SIP_SERVER_A:
538 case DH6OPT_DNS_SERVERS:
539 case DH6OPT_SNTP_SERVERS:
540 case DH6OPT_NIS_SERVERS:
541 case DH6OPT_NISP_SERVERS:
542 case DH6OPT_BCMCS_SERVER_A:
543 case DH6OPT_PANA_AGENT:
544 case DH6OPT_LQ_CLIENT_LINK:
545 if (optlen % 16) {
546 ND_PRINT((ndo, " ?)"));
547 break;
548 }
549 tp = (const u_char *)(dh6o + 1);
550 for (i = 0; i < optlen; i += 16)
551 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[i])));
552 ND_PRINT((ndo, ")"));
553 break;
554 case DH6OPT_SIP_SERVER_D:
555 case DH6OPT_DOMAIN_LIST:
556 tp = (const u_char *)(dh6o + 1);
557 while (tp < cp + sizeof(*dh6o) + optlen) {
558 ND_PRINT((ndo, " "));
559 if ((tp = ns_nprint(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL)
560 goto trunc;
561 }
562 ND_PRINT((ndo, ")"));
563 break;
564 case DH6OPT_STATUS_CODE:
565 if (optlen < 2) {
566 ND_PRINT((ndo, " ?)"));
567 break;
568 }
569 tp = (const u_char *)(dh6o + 1);
570 ND_PRINT((ndo, " %s)", dhcp6stcode(EXTRACT_16BITS(&tp[0]))));
571 break;
572 case DH6OPT_IA_NA:
573 case DH6OPT_IA_PD:
574 if (optlen < 12) {
575 ND_PRINT((ndo, " ?)"));
576 break;
577 }
578 tp = (const u_char *)(dh6o + 1);
579 ND_PRINT((ndo, " IAID:%u T1:%u T2:%u",
580 EXTRACT_32BITS(&tp[0]),
581 EXTRACT_32BITS(&tp[4]),
582 EXTRACT_32BITS(&tp[8])));
583 if (optlen > 12) {
584 /* there are sub-options */
585 dhcp6opt_print(ndo, tp + 12, tp + optlen);
586 }
587 ND_PRINT((ndo, ")"));
588 break;
589 case DH6OPT_IA_TA:
590 if (optlen < 4) {
591 ND_PRINT((ndo, " ?)"));
592 break;
593 }
594 tp = (const u_char *)(dh6o + 1);
595 ND_PRINT((ndo, " IAID:%u", EXTRACT_32BITS(tp)));
596 if (optlen > 4) {
597 /* there are sub-options */
598 dhcp6opt_print(ndo, tp + 4, tp + optlen);
599 }
600 ND_PRINT((ndo, ")"));
601 break;
602 case DH6OPT_IA_PD_PREFIX:
603 if (optlen < 25) {
604 ND_PRINT((ndo, " ?)"));
605 break;
606 }
607 tp = (const u_char *)(dh6o + 1);
608 ND_PRINT((ndo, " %s/%d", ip6addr_string(ndo, &tp[9]), tp[8]));
609 ND_PRINT((ndo, " pltime:%u vltime:%u",
610 EXTRACT_32BITS(&tp[0]),
611 EXTRACT_32BITS(&tp[4])));
612 if (optlen > 25) {
613 /* there are sub-options */
614 dhcp6opt_print(ndo, tp + 25, tp + optlen);
615 }
616 ND_PRINT((ndo, ")"));
617 break;
618 case DH6OPT_LIFETIME:
619 case DH6OPT_CLT_TIME:
620 if (optlen != 4) {
621 ND_PRINT((ndo, " ?)"));
622 break;
623 }
624 tp = (const u_char *)(dh6o + 1);
625 ND_PRINT((ndo, " %d)", EXTRACT_32BITS(tp)));
626 break;
627 case DH6OPT_REMOTE_ID:
628 if (optlen < 4) {
629 ND_PRINT((ndo, " ?)"));
630 break;
631 }
632 tp = (const u_char *)(dh6o + 1);
633 ND_PRINT((ndo, " %d ", EXTRACT_32BITS(tp)));
634 /*
635 * Print hex dump first 10 characters.
636 */
637 for (i = 4; i < optlen && i < 14; i++)
638 ND_PRINT((ndo, "%02x", tp[i]));
639 ND_PRINT((ndo, "...)"));
640 break;
641 case DH6OPT_LQ_QUERY:
642 if (optlen < 17) {
643 ND_PRINT((ndo, " ?)"));
644 break;
645 }
646 tp = (const u_char *)(dh6o + 1);
647 switch (*tp) {
648 case 1:
649 ND_PRINT((ndo, " by-address"));
650 break;
651 case 2:
652 ND_PRINT((ndo, " by-clientID"));
653 break;
654 default:
655 ND_PRINT((ndo, " type_%d", (int)*tp));
656 break;
657 }
658 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[1])));
659 if (optlen > 17) {
660 /* there are query-options */
661 dhcp6opt_print(ndo, tp + 17, tp + optlen);
662 }
663 ND_PRINT((ndo, ")"));
664 break;
665 case DH6OPT_CLIENT_DATA:
666 tp = (const u_char *)(dh6o + 1);
667 if (optlen > 0) {
668 /* there are encapsulated options */
669 dhcp6opt_print(ndo, tp, tp + optlen);
670 }
671 ND_PRINT((ndo, ")"));
672 break;
673 case DH6OPT_LQ_RELAY_DATA:
674 if (optlen < 16) {
675 ND_PRINT((ndo, " ?)"));
676 break;
677 }
678 tp = (const u_char *)(dh6o + 1);
679 ND_PRINT((ndo, " %s ", ip6addr_string(ndo, &tp[0])));
680 /*
681 * Print hex dump first 10 characters.
682 */
683 for (i = 16; i < optlen && i < 26; i++)
684 ND_PRINT((ndo, "%02x", tp[i]));
685 ND_PRINT((ndo, "...)"));
686 break;
687 case DH6OPT_NTP_SERVER:
688 if (optlen < 4) {
689 ND_PRINT((ndo, " ?)"));
690 break;
691 }
692 tp = (const u_char *)(dh6o + 1);
693 while (tp < cp + sizeof(*dh6o) + optlen - 4) {
694 subopt_code = EXTRACT_16BITS(tp);
695 tp += 2;
696 subopt_len = EXTRACT_16BITS(tp);
697 tp += 2;
698 if (tp + subopt_len > cp + sizeof(*dh6o) + optlen)
699 goto trunc;
700 ND_PRINT((ndo, " subopt:%d", subopt_code));
701 switch (subopt_code) {
702 case DH6OPT_NTP_SUBOPTION_SRV_ADDR:
703 case DH6OPT_NTP_SUBOPTION_MC_ADDR:
704 if (subopt_len != 16) {
705 ND_PRINT((ndo, " ?"));
706 break;
707 }
708 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0])));
709 break;
710 case DH6OPT_NTP_SUBOPTION_SRV_FQDN:
711 ND_PRINT((ndo, " "));
712 if (ns_nprint(ndo, tp, tp + subopt_len) == NULL)
713 goto trunc;
714 break;
715 default:
716 ND_PRINT((ndo, " ?"));
717 break;
718 }
719 tp += subopt_len;
720 }
721 ND_PRINT((ndo, ")"));
722 break;
723 case DH6OPT_AFTR_NAME:
724 if (optlen < 3) {
725 ND_PRINT((ndo, " ?)"));
726 break;
727 }
728 tp = (const u_char *)(dh6o + 1);
729 remain_len = optlen;
730 ND_PRINT((ndo, " "));
731 /* Encoding is described in section 3.1 of RFC 1035 */
732 while (remain_len && *tp) {
733 label_len = *tp++;
734 if (label_len < remain_len - 1) {
735 (void)fn_printn(ndo, tp, label_len, NULL);
736 tp += label_len;
737 remain_len -= (label_len + 1);
738 if(*tp) ND_PRINT((ndo, "."));
739 } else {
740 ND_PRINT((ndo, " ?"));
741 break;
742 }
743 }
744 ND_PRINT((ndo, ")"));
745 break;
746 case DH6OPT_NEW_POSIX_TIMEZONE: /* all three of these options */
747 case DH6OPT_NEW_TZDB_TIMEZONE: /* are encoded similarly */
748 case DH6OPT_MUDURL: /* although GMT might not work */
749 if (optlen < 5) {
750 ND_PRINT((ndo, " ?)"));
751 break;
752 }
753 tp = (const u_char *)(dh6o + 1);
754 ND_PRINT((ndo, "="));
755 (void)fn_printn(ndo, tp, (u_int)optlen, NULL);
756 ND_PRINT((ndo, ")"));
757 break;
758
759 default:
760 ND_PRINT((ndo, ")"));
761 break;
762 }
763
764 cp += sizeof(*dh6o) + optlen;
765 }
766 return;
767
768 trunc:
769 ND_PRINT((ndo, "[|dhcp6ext]"));
770 }
771
772 /*
773 * Print dhcp6 packets
774 */
775 void
776 dhcp6_print(netdissect_options *ndo,
777 const u_char *cp, u_int length)
778 {
779 const struct dhcp6 *dh6;
780 const struct dhcp6_relay *dh6relay;
781 const u_char *ep;
782 const u_char *extp;
783 const char *name;
784
785 ND_PRINT((ndo, "dhcp6"));
786
787 ep = (const u_char *)ndo->ndo_snapend;
788 if (cp + length < ep)
789 ep = cp + length;
790
791 dh6 = (const struct dhcp6 *)cp;
792 dh6relay = (const struct dhcp6_relay *)cp;
793 ND_TCHECK(dh6->dh6_xid);
794 name = tok2str(dh6_msgtype_str, "msgtype-%u", dh6->dh6_msgtype);
795
796 if (!ndo->ndo_vflag) {
797 ND_PRINT((ndo, " %s", name));
798 return;
799 }
800
801 /* XXX relay agent messages have to be handled differently */
802
803 ND_PRINT((ndo, " %s (", name)); /*)*/
804 if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
805 dh6->dh6_msgtype != DH6_RELAY_REPLY) {
806 ND_PRINT((ndo, "xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK));
807 extp = (const u_char *)(dh6 + 1);
808 dhcp6opt_print(ndo, extp, ep);
809 } else { /* relay messages */
810 struct in6_addr addr6;
811
812 ND_TCHECK(dh6relay->dh6relay_peeraddr);
813
814 memcpy(&addr6, dh6relay->dh6relay_linkaddr, sizeof (addr6));
815 ND_PRINT((ndo, "linkaddr=%s", ip6addr_string(ndo, &addr6)));
816
817 memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6));
818 ND_PRINT((ndo, " peeraddr=%s", ip6addr_string(ndo, &addr6)));
819
820 dhcp6opt_print(ndo, (const u_char *)(dh6relay + 1), ep);
821 }
822 /*(*/
823 ND_PRINT((ndo, ")"));
824 return;
825
826 trunc:
827 ND_PRINT((ndo, "[|dhcp6]"));
828 }
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