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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_ipv6 dh6relay_linkaddr; /* XXX: badly aligned */
122 nd_ipv6 dh6relay_peeraddr;
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 uint8_t auth_alg;
290 uint8_t auth_rdm;
291 u_int authinfolen, authrealmlen;
292 int remain_len; /* Length of remaining options */
293 int label_len; /* Label length */
294 uint16_t subopt_code;
295 uint16_t subopt_len;
296 uint8_t dh6_reconf_type;
297 uint8_t dh6_lq_query_type;
298
299 if (cp == ep)
300 return;
301 while (cp < ep) {
302 if (ep < cp + sizeof(*dh6o))
303 goto trunc;
304 dh6o = (const struct dhcp6opt *)cp;
305 ND_TCHECK(*dh6o);
306 optlen = EXTRACT_BE_U_2(&dh6o->dh6opt_len);
307 if (ep < cp + sizeof(*dh6o) + optlen)
308 goto trunc;
309 opttype = EXTRACT_BE_U_2(&dh6o->dh6opt_type);
310 ND_PRINT((ndo, " (%s", tok2str(dh6opt_str, "opt_%u", opttype)));
311 ND_TCHECK_LEN(cp + sizeof(*dh6o), optlen);
312 switch (opttype) {
313 case DH6OPT_CLIENTID:
314 case DH6OPT_SERVERID:
315 if (optlen < 2) {
316 /*(*/
317 ND_PRINT((ndo, " ?)"));
318 break;
319 }
320 tp = (const u_char *)(dh6o + 1);
321 switch (EXTRACT_BE_U_2(tp)) {
322 case 1:
323 if (optlen >= 2 + 6) {
324 ND_PRINT((ndo, " hwaddr/time type %u time %u ",
325 EXTRACT_BE_U_2(tp + 2),
326 EXTRACT_BE_U_4(tp + 4)));
327 for (i = 8; i < optlen; i++)
328 ND_PRINT((ndo, "%02x", EXTRACT_U_1(tp + i)));
329 /*(*/
330 ND_PRINT((ndo, ")"));
331 } else {
332 /*(*/
333 ND_PRINT((ndo, " ?)"));
334 }
335 break;
336 case 2:
337 if (optlen >= 2 + 8) {
338 ND_PRINT((ndo, " vid "));
339 for (i = 2; i < 2 + 8; i++)
340 ND_PRINT((ndo, "%02x", EXTRACT_U_1(tp + i)));
341 /*(*/
342 ND_PRINT((ndo, ")"));
343 } else {
344 /*(*/
345 ND_PRINT((ndo, " ?)"));
346 }
347 break;
348 case 3:
349 if (optlen >= 2 + 2) {
350 ND_PRINT((ndo, " hwaddr type %u ",
351 EXTRACT_BE_U_2(tp + 2)));
352 for (i = 4; i < optlen; i++)
353 ND_PRINT((ndo, "%02x", EXTRACT_U_1(tp + i)));
354 /*(*/
355 ND_PRINT((ndo, ")"));
356 } else {
357 /*(*/
358 ND_PRINT((ndo, " ?)"));
359 }
360 break;
361 default:
362 ND_PRINT((ndo, " type %d)", EXTRACT_BE_U_2(tp)));
363 break;
364 }
365 break;
366 case DH6OPT_IA_ADDR:
367 if (optlen < 24) {
368 /*(*/
369 ND_PRINT((ndo, " ?)"));
370 break;
371 }
372 tp = (const u_char *)(dh6o + 1);
373 ND_PRINT((ndo, " %s", ip6addr_string(ndo, tp)));
374 ND_PRINT((ndo, " pltime:%u vltime:%u",
375 EXTRACT_BE_U_4(tp + 16),
376 EXTRACT_BE_U_4(tp + 20)));
377 if (optlen > 24) {
378 /* there are sub-options */
379 dhcp6opt_print(ndo, tp + 24, tp + optlen);
380 }
381 ND_PRINT((ndo, ")"));
382 break;
383 case DH6OPT_ORO:
384 case DH6OPT_ERO:
385 if (optlen % 2) {
386 ND_PRINT((ndo, " ?)"));
387 break;
388 }
389 tp = (const u_char *)(dh6o + 1);
390 for (i = 0; i < optlen; i += 2) {
391 ND_PRINT((ndo, " %s",
392 tok2str(dh6opt_str, "opt_%u", EXTRACT_BE_U_2(tp + i))));
393 }
394 ND_PRINT((ndo, ")"));
395 break;
396 case DH6OPT_PREFERENCE:
397 if (optlen != 1) {
398 ND_PRINT((ndo, " ?)"));
399 break;
400 }
401 tp = (const u_char *)(dh6o + 1);
402 ND_PRINT((ndo, " %d)", EXTRACT_U_1(tp)));
403 break;
404 case DH6OPT_ELAPSED_TIME:
405 if (optlen != 2) {
406 ND_PRINT((ndo, " ?)"));
407 break;
408 }
409 tp = (const u_char *)(dh6o + 1);
410 ND_PRINT((ndo, " %d)", EXTRACT_BE_U_2(tp)));
411 break;
412 case DH6OPT_RELAY_MSG:
413 ND_PRINT((ndo, " ("));
414 tp = (const u_char *)(dh6o + 1);
415 dhcp6_print(ndo, tp, optlen);
416 ND_PRINT((ndo, ")"));
417 break;
418 case DH6OPT_AUTH:
419 if (optlen < 11) {
420 ND_PRINT((ndo, " ?)"));
421 break;
422 }
423 tp = (const u_char *)(dh6o + 1);
424 auth_proto = EXTRACT_U_1(tp);
425 switch (auth_proto) {
426 case DH6OPT_AUTHPROTO_DELAYED:
427 ND_PRINT((ndo, " proto: delayed"));
428 break;
429 case DH6OPT_AUTHPROTO_RECONFIG:
430 ND_PRINT((ndo, " proto: reconfigure"));
431 break;
432 default:
433 ND_PRINT((ndo, " proto: %d", auth_proto));
434 break;
435 }
436 tp++;
437 auth_alg = EXTRACT_U_1(tp);
438 switch (auth_alg) {
439 case DH6OPT_AUTHALG_HMACMD5:
440 /* XXX: may depend on the protocol */
441 ND_PRINT((ndo, ", alg: HMAC-MD5"));
442 break;
443 default:
444 ND_PRINT((ndo, ", alg: %d", auth_alg));
445 break;
446 }
447 tp++;
448 auth_rdm = EXTRACT_U_1(tp);
449 switch (auth_rdm) {
450 case DH6OPT_AUTHRDM_MONOCOUNTER:
451 ND_PRINT((ndo, ", RDM: mono"));
452 break;
453 default:
454 ND_PRINT((ndo, ", RDM: %d", auth_rdm));
455 break;
456 }
457 tp++;
458 ND_PRINT((ndo, ", RD:"));
459 for (i = 0; i < 4; i++, tp += 2)
460 ND_PRINT((ndo, " %04x", EXTRACT_BE_U_2(tp)));
461
462 /* protocol dependent part */
463 authinfolen = optlen - 11;
464 switch (auth_proto) {
465 case DH6OPT_AUTHPROTO_DELAYED:
466 if (authinfolen == 0)
467 break;
468 if (authinfolen < 20) {
469 ND_PRINT((ndo, " ??"));
470 break;
471 }
472 authrealmlen = authinfolen - 20;
473 if (authrealmlen > 0) {
474 ND_PRINT((ndo, ", realm: "));
475 }
476 for (i = 0; i < authrealmlen; i++, tp++)
477 ND_PRINT((ndo, "%02x", EXTRACT_U_1(tp)));
478 ND_PRINT((ndo, ", key ID: %08x", EXTRACT_BE_U_4(tp)));
479 tp += 4;
480 ND_PRINT((ndo, ", HMAC-MD5:"));
481 for (i = 0; i < 4; i++, tp+= 4)
482 ND_PRINT((ndo, " %08x", EXTRACT_BE_U_4(tp)));
483 break;
484 case DH6OPT_AUTHPROTO_RECONFIG:
485 if (authinfolen != 17) {
486 ND_PRINT((ndo, " ??"));
487 break;
488 }
489 switch (EXTRACT_U_1(tp)) {
490 case DH6OPT_AUTHRECONFIG_KEY:
491 ND_PRINT((ndo, " reconfig-key"));
492 break;
493 case DH6OPT_AUTHRECONFIG_HMACMD5:
494 ND_PRINT((ndo, " type: HMAC-MD5"));
495 break;
496 default:
497 ND_PRINT((ndo, " type: ??"));
498 break;
499 }
500 tp++;
501 ND_PRINT((ndo, " value:"));
502 for (i = 0; i < 4; i++, tp+= 4)
503 ND_PRINT((ndo, " %08x", EXTRACT_BE_U_4(tp)));
504 break;
505 default:
506 ND_PRINT((ndo, " ??"));
507 break;
508 }
509
510 ND_PRINT((ndo, ")"));
511 break;
512 case DH6OPT_RAPID_COMMIT: /* nothing todo */
513 ND_PRINT((ndo, ")"));
514 break;
515 case DH6OPT_INTERFACE_ID:
516 case DH6OPT_SUBSCRIBER_ID:
517 /*
518 * Since we cannot predict the encoding, print hex dump
519 * at most 10 characters.
520 */
521 tp = (const u_char *)(dh6o + 1);
522 ND_PRINT((ndo, " "));
523 for (i = 0; i < optlen && i < 10; i++)
524 ND_PRINT((ndo, "%02x", EXTRACT_U_1(tp + i)));
525 ND_PRINT((ndo, "...)"));
526 break;
527 case DH6OPT_RECONF_MSG:
528 if (optlen != 1) {
529 ND_PRINT((ndo, " ?)"));
530 break;
531 }
532 tp = (const u_char *)(dh6o + 1);
533 dh6_reconf_type = EXTRACT_U_1(tp);
534 switch (dh6_reconf_type) {
535 case DH6_RENEW:
536 ND_PRINT((ndo, " for renew)"));
537 break;
538 case DH6_INFORM_REQ:
539 ND_PRINT((ndo, " for inf-req)"));
540 break;
541 default:
542 ND_PRINT((ndo, " for ?\?\?(%02x))", dh6_reconf_type));
543 break;
544 }
545 break;
546 case DH6OPT_RECONF_ACCEPT: /* nothing todo */
547 ND_PRINT((ndo, ")"));
548 break;
549 case DH6OPT_SIP_SERVER_A:
550 case DH6OPT_DNS_SERVERS:
551 case DH6OPT_SNTP_SERVERS:
552 case DH6OPT_NIS_SERVERS:
553 case DH6OPT_NISP_SERVERS:
554 case DH6OPT_BCMCS_SERVER_A:
555 case DH6OPT_PANA_AGENT:
556 case DH6OPT_LQ_CLIENT_LINK:
557 if (optlen % 16) {
558 ND_PRINT((ndo, " ?)"));
559 break;
560 }
561 tp = (const u_char *)(dh6o + 1);
562 for (i = 0; i < optlen; i += 16)
563 ND_PRINT((ndo, " %s", ip6addr_string(ndo, tp + i)));
564 ND_PRINT((ndo, ")"));
565 break;
566 case DH6OPT_SIP_SERVER_D:
567 case DH6OPT_DOMAIN_LIST:
568 tp = (const u_char *)(dh6o + 1);
569 while (tp < cp + sizeof(*dh6o) + optlen) {
570 ND_PRINT((ndo, " "));
571 if ((tp = ns_nprint(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL)
572 goto trunc;
573 }
574 ND_PRINT((ndo, ")"));
575 break;
576 case DH6OPT_STATUS_CODE:
577 if (optlen < 2) {
578 ND_PRINT((ndo, " ?)"));
579 break;
580 }
581 tp = (const u_char *)(dh6o + 1);
582 ND_PRINT((ndo, " %s)", dhcp6stcode(EXTRACT_BE_U_2(tp))));
583 break;
584 case DH6OPT_IA_NA:
585 case DH6OPT_IA_PD:
586 if (optlen < 12) {
587 ND_PRINT((ndo, " ?)"));
588 break;
589 }
590 tp = (const u_char *)(dh6o + 1);
591 ND_PRINT((ndo, " IAID:%u T1:%u T2:%u",
592 EXTRACT_BE_U_4(tp),
593 EXTRACT_BE_U_4(tp + 4),
594 EXTRACT_BE_U_4(tp + 8)));
595 if (optlen > 12) {
596 /* there are sub-options */
597 dhcp6opt_print(ndo, tp + 12, tp + optlen);
598 }
599 ND_PRINT((ndo, ")"));
600 break;
601 case DH6OPT_IA_TA:
602 if (optlen < 4) {
603 ND_PRINT((ndo, " ?)"));
604 break;
605 }
606 tp = (const u_char *)(dh6o + 1);
607 ND_PRINT((ndo, " IAID:%u", EXTRACT_BE_U_4(tp)));
608 if (optlen > 4) {
609 /* there are sub-options */
610 dhcp6opt_print(ndo, tp + 4, tp + optlen);
611 }
612 ND_PRINT((ndo, ")"));
613 break;
614 case DH6OPT_IA_PD_PREFIX:
615 if (optlen < 25) {
616 ND_PRINT((ndo, " ?)"));
617 break;
618 }
619 tp = (const u_char *)(dh6o + 1);
620 ND_PRINT((ndo, " %s/%d", ip6addr_string(ndo, tp + 9), EXTRACT_U_1(tp + 8)));
621 ND_PRINT((ndo, " pltime:%u vltime:%u",
622 EXTRACT_BE_U_4(tp),
623 EXTRACT_BE_U_4(tp + 4)));
624 if (optlen > 25) {
625 /* there are sub-options */
626 dhcp6opt_print(ndo, tp + 25, tp + optlen);
627 }
628 ND_PRINT((ndo, ")"));
629 break;
630 case DH6OPT_LIFETIME:
631 case DH6OPT_CLT_TIME:
632 if (optlen != 4) {
633 ND_PRINT((ndo, " ?)"));
634 break;
635 }
636 tp = (const u_char *)(dh6o + 1);
637 ND_PRINT((ndo, " %d)", EXTRACT_BE_U_4(tp)));
638 break;
639 case DH6OPT_REMOTE_ID:
640 if (optlen < 4) {
641 ND_PRINT((ndo, " ?)"));
642 break;
643 }
644 tp = (const u_char *)(dh6o + 1);
645 ND_PRINT((ndo, " %d ", EXTRACT_BE_U_4(tp)));
646 /*
647 * Print hex dump first 10 characters.
648 */
649 for (i = 4; i < optlen && i < 14; i++)
650 ND_PRINT((ndo, "%02x", EXTRACT_U_1(tp + i)));
651 ND_PRINT((ndo, "...)"));
652 break;
653 case DH6OPT_LQ_QUERY:
654 if (optlen < 17) {
655 ND_PRINT((ndo, " ?)"));
656 break;
657 }
658 tp = (const u_char *)(dh6o + 1);
659 dh6_lq_query_type = EXTRACT_U_1(tp);
660 switch (dh6_lq_query_type) {
661 case 1:
662 ND_PRINT((ndo, " by-address"));
663 break;
664 case 2:
665 ND_PRINT((ndo, " by-clientID"));
666 break;
667 default:
668 ND_PRINT((ndo, " type_%u", dh6_lq_query_type));
669 break;
670 }
671 ND_PRINT((ndo, " %s", ip6addr_string(ndo, tp + 1)));
672 if (optlen > 17) {
673 /* there are query-options */
674 dhcp6opt_print(ndo, tp + 17, tp + optlen);
675 }
676 ND_PRINT((ndo, ")"));
677 break;
678 case DH6OPT_CLIENT_DATA:
679 tp = (const u_char *)(dh6o + 1);
680 if (optlen > 0) {
681 /* there are encapsulated options */
682 dhcp6opt_print(ndo, tp, tp + optlen);
683 }
684 ND_PRINT((ndo, ")"));
685 break;
686 case DH6OPT_LQ_RELAY_DATA:
687 if (optlen < 16) {
688 ND_PRINT((ndo, " ?)"));
689 break;
690 }
691 tp = (const u_char *)(dh6o + 1);
692 ND_PRINT((ndo, " %s ", ip6addr_string(ndo, tp)));
693 /*
694 * Print hex dump first 10 characters.
695 */
696 for (i = 16; i < optlen && i < 26; i++)
697 ND_PRINT((ndo, "%02x", EXTRACT_U_1(tp + i)));
698 ND_PRINT((ndo, "...)"));
699 break;
700 case DH6OPT_NTP_SERVER:
701 if (optlen < 4) {
702 ND_PRINT((ndo, " ?)"));
703 break;
704 }
705 tp = (const u_char *)(dh6o + 1);
706 while (tp < cp + sizeof(*dh6o) + optlen - 4) {
707 subopt_code = EXTRACT_BE_U_2(tp);
708 tp += 2;
709 subopt_len = EXTRACT_BE_U_2(tp);
710 tp += 2;
711 if (tp + subopt_len > cp + sizeof(*dh6o) + optlen)
712 goto trunc;
713 ND_PRINT((ndo, " subopt:%d", subopt_code));
714 switch (subopt_code) {
715 case DH6OPT_NTP_SUBOPTION_SRV_ADDR:
716 case DH6OPT_NTP_SUBOPTION_MC_ADDR:
717 if (subopt_len != 16) {
718 ND_PRINT((ndo, " ?"));
719 break;
720 }
721 ND_PRINT((ndo, " %s", ip6addr_string(ndo, tp)));
722 break;
723 case DH6OPT_NTP_SUBOPTION_SRV_FQDN:
724 ND_PRINT((ndo, " "));
725 if (ns_nprint(ndo, tp, tp + subopt_len) == NULL)
726 goto trunc;
727 break;
728 default:
729 ND_PRINT((ndo, " ?"));
730 break;
731 }
732 tp += subopt_len;
733 }
734 ND_PRINT((ndo, ")"));
735 break;
736 case DH6OPT_AFTR_NAME:
737 if (optlen < 3) {
738 ND_PRINT((ndo, " ?)"));
739 break;
740 }
741 tp = (const u_char *)(dh6o + 1);
742 remain_len = optlen;
743 ND_PRINT((ndo, " "));
744 /* Encoding is described in section 3.1 of RFC 1035 */
745 while (remain_len && EXTRACT_U_1(tp)) {
746 label_len = EXTRACT_U_1(tp);
747 tp++;
748 if (label_len < remain_len - 1) {
749 (void)fn_printn(ndo, tp, label_len, NULL);
750 tp += label_len;
751 remain_len -= (label_len + 1);
752 if(EXTRACT_U_1(tp)) ND_PRINT((ndo, "."));
753 } else {
754 ND_PRINT((ndo, " ?"));
755 break;
756 }
757 }
758 ND_PRINT((ndo, ")"));
759 break;
760 case DH6OPT_NEW_POSIX_TIMEZONE: /* all three of these options */
761 case DH6OPT_NEW_TZDB_TIMEZONE: /* are encoded similarly */
762 case DH6OPT_MUDURL: /* although GMT might not work */
763 if (optlen < 5) {
764 ND_PRINT((ndo, " ?)"));
765 break;
766 }
767 tp = (const u_char *)(dh6o + 1);
768 ND_PRINT((ndo, "="));
769 (void)fn_printn(ndo, tp, (u_int)optlen, NULL);
770 ND_PRINT((ndo, ")"));
771 break;
772
773 default:
774 ND_PRINT((ndo, ")"));
775 break;
776 }
777
778 cp += sizeof(*dh6o) + optlen;
779 }
780 return;
781
782 trunc:
783 ND_PRINT((ndo, "[|dhcp6ext]"));
784 }
785
786 /*
787 * Print dhcp6 packets
788 */
789 void
790 dhcp6_print(netdissect_options *ndo,
791 const u_char *cp, u_int length)
792 {
793 const struct dhcp6 *dh6;
794 const struct dhcp6_relay *dh6relay;
795 uint8_t msgtype;
796 const u_char *ep;
797 const u_char *extp;
798 const char *name;
799
800 ND_PRINT((ndo, "dhcp6"));
801
802 ep = (const u_char *)ndo->ndo_snapend;
803 if (cp + length < ep)
804 ep = cp + length;
805
806 dh6 = (const struct dhcp6 *)cp;
807 dh6relay = (const struct dhcp6_relay *)cp;
808 ND_TCHECK(dh6->dh6_xid);
809 msgtype = EXTRACT_U_1(dh6->dh6_msgtype);
810 name = tok2str(dh6_msgtype_str, "msgtype-%u", msgtype);
811
812 if (!ndo->ndo_vflag) {
813 ND_PRINT((ndo, " %s", name));
814 return;
815 }
816
817 /* XXX relay agent messages have to be handled differently */
818
819 ND_PRINT((ndo, " %s (", name)); /*)*/
820 if (msgtype != DH6_RELAY_FORW && msgtype != DH6_RELAY_REPLY) {
821 ND_PRINT((ndo, "xid=%x", EXTRACT_BE_U_4(dh6->dh6_xid) & DH6_XIDMASK));
822 extp = (const u_char *)(dh6 + 1);
823 dhcp6opt_print(ndo, extp, ep);
824 } else { /* relay messages */
825 struct in6_addr addr6;
826
827 ND_TCHECK(dh6relay->dh6relay_peeraddr);
828
829 memcpy(&addr6, &dh6relay->dh6relay_linkaddr, sizeof (addr6));
830 ND_PRINT((ndo, "linkaddr=%s", ip6addr_string(ndo, &addr6)));
831
832 memcpy(&addr6, &dh6relay->dh6relay_peeraddr, sizeof (addr6));
833 ND_PRINT((ndo, " peeraddr=%s", ip6addr_string(ndo, &addr6)));
834
835 dhcp6opt_print(ndo, (const u_char *)(dh6relay + 1), ep);
836 }
837 /*(*/
838 ND_PRINT((ndo, ")"));
839 return;
840
841 trunc:
842 ND_PRINT((ndo, "[|dhcp6]"));
843 }
[mirror] the TCPdump network dissector