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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 "netdissect.h"
53 #include "addrtoname.h"
54 #include "extract.h"
55
56 /* lease duration */
57 #define DHCP6_DURATION_INFINITE 0xffffffff
58
59 /* Error Values */
60 #define DH6ERR_FAILURE 16
61 #define DH6ERR_AUTHFAIL 17
62 #define DH6ERR_POORLYFORMED 18
63 #define DH6ERR_UNAVAIL 19
64 #define DH6ERR_OPTUNAVAIL 20
65
66 /* Message type */
67 #define DH6_SOLICIT 1
68 #define DH6_ADVERTISE 2
69 #define DH6_REQUEST 3
70 #define DH6_CONFIRM 4
71 #define DH6_RENEW 5
72 #define DH6_REBIND 6
73 #define DH6_REPLY 7
74 #define DH6_RELEASE 8
75 #define DH6_DECLINE 9
76 #define DH6_RECONFIGURE 10
77 #define DH6_INFORM_REQ 11
78 #define DH6_RELAY_FORW 12
79 #define DH6_RELAY_REPLY 13
80 #define DH6_LEASEQUERY 14
81 #define DH6_LQ_REPLY 15
82
83 static const struct tok dh6_msgtype_str[] = {
84 { DH6_SOLICIT, "solicit" },
85 { DH6_ADVERTISE, "advertise" },
86 { DH6_REQUEST, "request" },
87 { DH6_CONFIRM, "confirm" },
88 { DH6_RENEW, "renew" },
89 { DH6_REBIND, "rebind" },
90 { DH6_REPLY, "reply" },
91 { DH6_RELEASE, "release" },
92 { DH6_DECLINE, "decline" },
93 { DH6_RECONFIGURE, "reconfigure" },
94 { DH6_INFORM_REQ, "inf-req" },
95 { DH6_RELAY_FORW, "relay-fwd" },
96 { DH6_RELAY_REPLY, "relay-reply" },
97 { DH6_LEASEQUERY, "leasequery" },
98 { DH6_LQ_REPLY, "leasequery-reply" },
99 { 0, NULL }
100 };
101
102 /* DHCP6 base packet format */
103 struct dhcp6 {
104 union {
105 nd_uint8_t msgtype;
106 nd_uint32_t xid;
107 } dh6_msgtypexid;
108 /* options follow */
109 };
110 #define DH6_XIDMASK 0x00ffffff
111
112 /* DHCPv6 relay messages */
113 struct dhcp6_relay {
114 nd_uint8_t dh6relay_msgtype;
115 nd_uint8_t dh6relay_hcnt;
116 nd_ipv6 dh6relay_linkaddr; /* XXX: badly aligned */
117 nd_ipv6 dh6relay_peeraddr;
118 /* options follow */
119 };
120
121 /* options */
122 #define DH6OPT_CLIENTID 1
123 #define DH6OPT_SERVERID 2
124 #define DH6OPT_IA_NA 3
125 #define DH6OPT_IA_TA 4
126 #define DH6OPT_IA_ADDR 5
127 #define DH6OPT_ORO 6
128 #define DH6OPT_PREFERENCE 7
129 # define DH6OPT_PREF_MAX 255
130 #define DH6OPT_ELAPSED_TIME 8
131 #define DH6OPT_RELAY_MSG 9
132 /*#define DH6OPT_SERVER_MSG 10 deprecated */
133 #define DH6OPT_AUTH 11
134 # define DH6OPT_AUTHPROTO_DELAYED 2
135 # define DH6OPT_AUTHPROTO_RECONFIG 3
136 # define DH6OPT_AUTHALG_HMACMD5 1
137 # define DH6OPT_AUTHRDM_MONOCOUNTER 0
138 # define DH6OPT_AUTHRECONFIG_KEY 1
139 # define DH6OPT_AUTHRECONFIG_HMACMD5 2
140 #define DH6OPT_UNICAST 12
141 #define DH6OPT_STATUS_CODE 13
142 # define DH6OPT_STCODE_SUCCESS 0
143 # define DH6OPT_STCODE_UNSPECFAIL 1
144 # define DH6OPT_STCODE_NOADDRAVAIL 2
145 # define DH6OPT_STCODE_NOBINDING 3
146 # define DH6OPT_STCODE_NOTONLINK 4
147 # define DH6OPT_STCODE_USEMULTICAST 5
148 # define DH6OPT_STCODE_NOPREFIXAVAIL 6
149 # define DH6OPT_STCODE_UNKNOWNQUERYTYPE 7
150 # define DH6OPT_STCODE_MALFORMEDQUERY 8
151 # define DH6OPT_STCODE_NOTCONFIGURED 9
152 # define DH6OPT_STCODE_NOTALLOWED 10
153 #define DH6OPT_RAPID_COMMIT 14
154 #define DH6OPT_USER_CLASS 15
155 #define DH6OPT_VENDOR_CLASS 16
156 #define DH6OPT_VENDOR_OPTS 17
157 #define DH6OPT_INTERFACE_ID 18
158 #define DH6OPT_RECONF_MSG 19
159 #define DH6OPT_RECONF_ACCEPT 20
160 #define DH6OPT_SIP_SERVER_D 21
161 #define DH6OPT_SIP_SERVER_A 22
162 #define DH6OPT_DNS_SERVERS 23
163 #define DH6OPT_DOMAIN_LIST 24
164 #define DH6OPT_IA_PD 25
165 #define DH6OPT_IA_PD_PREFIX 26
166 #define DH6OPT_NIS_SERVERS 27
167 #define DH6OPT_NISP_SERVERS 28
168 #define DH6OPT_NIS_NAME 29
169 #define DH6OPT_NISP_NAME 30
170 #define DH6OPT_SNTP_SERVERS 31
171 #define DH6OPT_LIFETIME 32
172 #define DH6OPT_BCMCS_SERVER_D 33
173 #define DH6OPT_BCMCS_SERVER_A 34
174 #define DH6OPT_GEOCONF_CIVIC 36
175 #define DH6OPT_REMOTE_ID 37
176 #define DH6OPT_SUBSCRIBER_ID 38
177 #define DH6OPT_CLIENT_FQDN 39
178 #define DH6OPT_PANA_AGENT 40
179 #define DH6OPT_NEW_POSIX_TIMEZONE 41
180 #define DH6OPT_NEW_TZDB_TIMEZONE 42
181 #define DH6OPT_ERO 43
182 #define DH6OPT_LQ_QUERY 44
183 #define DH6OPT_CLIENT_DATA 45
184 #define DH6OPT_CLT_TIME 46
185 #define DH6OPT_LQ_RELAY_DATA 47
186 #define DH6OPT_LQ_CLIENT_LINK 48
187 #define DH6OPT_NTP_SERVER 56
188 # define DH6OPT_NTP_SUBOPTION_SRV_ADDR 1
189 # define DH6OPT_NTP_SUBOPTION_MC_ADDR 2
190 # define DH6OPT_NTP_SUBOPTION_SRV_FQDN 3
191 #define DH6OPT_AFTR_NAME 64
192 #define DH6OPT_MUDURL 112
193
194 static const struct tok dh6opt_str[] = {
195 { DH6OPT_CLIENTID, "client-ID" },
196 { DH6OPT_SERVERID, "server-ID" },
197 { DH6OPT_IA_NA, "IA_NA" },
198 { DH6OPT_IA_TA, "IA_TA" },
199 { DH6OPT_IA_ADDR, "IA_ADDR" },
200 { DH6OPT_ORO, "option-request" },
201 { DH6OPT_PREFERENCE, "preference" },
202 { DH6OPT_ELAPSED_TIME, "elapsed-time" },
203 { DH6OPT_RELAY_MSG, "relay-message" },
204 { DH6OPT_AUTH, "authentication" },
205 { DH6OPT_UNICAST, "server-unicast" },
206 { DH6OPT_STATUS_CODE, "status-code" },
207 { DH6OPT_RAPID_COMMIT, "rapid-commit" },
208 { DH6OPT_USER_CLASS, "user-class" },
209 { DH6OPT_VENDOR_CLASS, "vendor-class" },
210 { DH6OPT_VENDOR_OPTS, "vendor-specific-info" },
211 { DH6OPT_INTERFACE_ID, "interface-ID" },
212 { DH6OPT_RECONF_MSG, "reconfigure-message" },
213 { DH6OPT_RECONF_ACCEPT, "reconfigure-accept" },
214 { DH6OPT_SIP_SERVER_D, "SIP-servers-domain" },
215 { DH6OPT_SIP_SERVER_A, "SIP-servers-address" },
216 { DH6OPT_DNS_SERVERS, "DNS-server" },
217 { DH6OPT_DOMAIN_LIST, "DNS-search-list" },
218 { DH6OPT_IA_PD, "IA_PD" },
219 { DH6OPT_IA_PD_PREFIX, "IA_PD-prefix" },
220 { DH6OPT_SNTP_SERVERS, "SNTP-servers" },
221 { DH6OPT_LIFETIME, "lifetime" },
222 { DH6OPT_NIS_SERVERS, "NIS-server" },
223 { DH6OPT_NISP_SERVERS, "NIS+-server" },
224 { DH6OPT_NIS_NAME, "NIS-domain-name" },
225 { DH6OPT_NISP_NAME, "NIS+-domain-name" },
226 { DH6OPT_BCMCS_SERVER_D, "BCMCS-domain-name" },
227 { DH6OPT_BCMCS_SERVER_A, "BCMCS-server" },
228 { DH6OPT_GEOCONF_CIVIC, "Geoconf-Civic" },
229 { DH6OPT_REMOTE_ID, "Remote-ID" },
230 { DH6OPT_SUBSCRIBER_ID, "Subscriber-ID" },
231 { DH6OPT_CLIENT_FQDN, "Client-FQDN" },
232 { DH6OPT_PANA_AGENT, "PANA-agent" },
233 { DH6OPT_NEW_POSIX_TIMEZONE, "POSIX-timezone" },
234 { DH6OPT_NEW_TZDB_TIMEZONE, "POSIX-tz-database" },
235 { DH6OPT_ERO, "Echo-request-option" },
236 { DH6OPT_LQ_QUERY, "Lease-query" },
237 { DH6OPT_CLIENT_DATA, "LQ-client-data" },
238 { DH6OPT_CLT_TIME, "Clt-time" },
239 { DH6OPT_LQ_RELAY_DATA, "LQ-relay-data" },
240 { DH6OPT_LQ_CLIENT_LINK, "LQ-client-link" },
241 { DH6OPT_NTP_SERVER, "NTP-server" },
242 { DH6OPT_AFTR_NAME, "AFTR-Name" },
243 { DH6OPT_MUDURL, "MUD-URL" },
244 { 0, NULL }
245 };
246
247 static const struct tok dh6opt_stcode_str[] = {
248 { DH6OPT_STCODE_SUCCESS, "Success" }, /* RFC3315 */
249 { DH6OPT_STCODE_UNSPECFAIL, "UnspecFail" }, /* RFC3315 */
250 { DH6OPT_STCODE_NOADDRAVAIL, "NoAddrsAvail" }, /* RFC3315 */
251 { DH6OPT_STCODE_NOBINDING, "NoBinding" }, /* RFC3315 */
252 { DH6OPT_STCODE_NOTONLINK, "NotOnLink" }, /* RFC3315 */
253 { DH6OPT_STCODE_USEMULTICAST, "UseMulticast" }, /* RFC3315 */
254 { DH6OPT_STCODE_NOPREFIXAVAIL, "NoPrefixAvail" }, /* RFC3633 */
255 { DH6OPT_STCODE_UNKNOWNQUERYTYPE, "UnknownQueryType" }, /* RFC5007 */
256 { DH6OPT_STCODE_MALFORMEDQUERY, "MalformedQuery" }, /* RFC5007 */
257 { DH6OPT_STCODE_NOTCONFIGURED, "NotConfigured" }, /* RFC5007 */
258 { DH6OPT_STCODE_NOTALLOWED, "NotAllowed" }, /* RFC5007 */
259 { 0, NULL }
260 };
261
262 struct dhcp6opt {
263 nd_uint16_t dh6opt_type;
264 nd_uint16_t dh6opt_len;
265 /* type-dependent data follows */
266 };
267
268 static const char *
269 dhcp6stcode(const uint16_t code)
270 {
271 return code > 255 ? "INVALID code" : tok2str(dh6opt_stcode_str, "code%u", code);
272 }
273
274 static void
275 dhcp6opt_print(netdissect_options *ndo,
276 const u_char *cp, const u_char *ep)
277 {
278 const struct dhcp6opt *dh6o;
279 const u_char *tp;
280 u_int i;
281 uint16_t opttype;
282 uint16_t optlen;
283 uint8_t auth_proto;
284 uint8_t auth_alg;
285 uint8_t auth_rdm;
286 u_int authinfolen, authrealmlen;
287 u_int remain_len; /* Length of remaining options */
288 u_int label_len; /* Label length */
289 uint16_t subopt_code;
290 uint16_t subopt_len;
291 uint8_t dh6_reconf_type;
292 uint8_t dh6_lq_query_type;
293
294 if (cp == ep)
295 return;
296 while (cp < ep) {
297 if (ep < cp + sizeof(*dh6o))
298 goto trunc;
299 dh6o = (const struct dhcp6opt *)cp;
300 ND_TCHECK_SIZE(dh6o);
301 optlen = GET_BE_U_2(dh6o->dh6opt_len);
302 if (ep < cp + sizeof(*dh6o) + optlen)
303 goto trunc;
304 opttype = GET_BE_U_2(dh6o->dh6opt_type);
305 ND_PRINT(" (%s", tok2str(dh6opt_str, "opt_%u", opttype));
306 ND_TCHECK_LEN(cp + sizeof(*dh6o), optlen);
307 switch (opttype) {
308 case DH6OPT_CLIENTID:
309 case DH6OPT_SERVERID:
310 if (optlen < 2) {
311 /*(*/
312 ND_PRINT(" ?)");
313 break;
314 }
315 tp = (const u_char *)(dh6o + 1);
316 switch (GET_BE_U_2(tp)) {
317 case 1:
318 if (optlen >= 2 + 6) {
319 ND_PRINT(" hwaddr/time type %u time %u ",
320 GET_BE_U_2(tp + 2),
321 GET_BE_U_4(tp + 4));
322 for (i = 8; i < optlen; i++)
323 ND_PRINT("%02x",
324 GET_U_1(tp + i));
325 /*(*/
326 ND_PRINT(")");
327 } else {
328 /*(*/
329 ND_PRINT(" ?)");
330 }
331 break;
332 case 2:
333 if (optlen >= 2 + 8) {
334 ND_PRINT(" vid ");
335 for (i = 2; i < 2 + 8; i++)
336 ND_PRINT("%02x",
337 GET_U_1(tp + i));
338 /*(*/
339 ND_PRINT(")");
340 } else {
341 /*(*/
342 ND_PRINT(" ?)");
343 }
344 break;
345 case 3:
346 if (optlen >= 2 + 2) {
347 ND_PRINT(" hwaddr type %u ",
348 GET_BE_U_2(tp + 2));
349 for (i = 4; i < optlen; i++)
350 ND_PRINT("%02x",
351 GET_U_1(tp + i));
352 /*(*/
353 ND_PRINT(")");
354 } else {
355 /*(*/
356 ND_PRINT(" ?)");
357 }
358 break;
359 default:
360 ND_PRINT(" type %u)", GET_BE_U_2(tp));
361 break;
362 }
363 break;
364 case DH6OPT_IA_ADDR:
365 if (optlen < 24) {
366 /*(*/
367 ND_PRINT(" ?)");
368 break;
369 }
370 tp = (const u_char *)(dh6o + 1);
371 ND_PRINT(" %s", GET_IP6ADDR_STRING(tp));
372 ND_PRINT(" pltime:%u vltime:%u",
373 GET_BE_U_4(tp + 16),
374 GET_BE_U_4(tp + 20));
375 if (optlen > 24) {
376 /* there are sub-options */
377 dhcp6opt_print(ndo, tp + 24, tp + optlen);
378 }
379 ND_PRINT(")");
380 break;
381 case DH6OPT_ORO:
382 case DH6OPT_ERO:
383 if (optlen % 2) {
384 ND_PRINT(" ?)");
385 break;
386 }
387 tp = (const u_char *)(dh6o + 1);
388 for (i = 0; i < optlen; i += 2) {
389 ND_PRINT(" %s",
390 tok2str(dh6opt_str, "opt_%u", GET_BE_U_2(tp + i)));
391 }
392 ND_PRINT(")");
393 break;
394 case DH6OPT_PREFERENCE:
395 if (optlen != 1) {
396 ND_PRINT(" ?)");
397 break;
398 }
399 tp = (const u_char *)(dh6o + 1);
400 ND_PRINT(" %u)", GET_U_1(tp));
401 break;
402 case DH6OPT_ELAPSED_TIME:
403 if (optlen != 2) {
404 ND_PRINT(" ?)");
405 break;
406 }
407 tp = (const u_char *)(dh6o + 1);
408 ND_PRINT(" %u)", GET_BE_U_2(tp));
409 break;
410 case DH6OPT_RELAY_MSG:
411 {
412 const u_char *snapend_save;
413
414 ND_PRINT(" (");
415 tp = (const u_char *)(dh6o + 1);
416 /*
417 * Update the snapend to the end of the option before
418 * calling recursively dhcp6_print() for the nested
419 * packet. Other options may be present after the
420 * nested DHCPv6 packet. This prevents that, in
421 * dhcp6_print(), for the nested DHCPv6 packet, the
422 * remaining length < remaining caplen.
423 */
424 snapend_save = ndo->ndo_snapend;
425 ndo->ndo_snapend = ND_MIN(tp + optlen, ndo->ndo_snapend);
426 dhcp6_print(ndo, tp, optlen);
427 ndo->ndo_snapend = snapend_save;
428 ND_PRINT(")");
429 break;
430 }
431 case DH6OPT_AUTH:
432 if (optlen < 11) {
433 ND_PRINT(" ?)");
434 break;
435 }
436 tp = (const u_char *)(dh6o + 1);
437 auth_proto = GET_U_1(tp);
438 switch (auth_proto) {
439 case DH6OPT_AUTHPROTO_DELAYED:
440 ND_PRINT(" proto: delayed");
441 break;
442 case DH6OPT_AUTHPROTO_RECONFIG:
443 ND_PRINT(" proto: reconfigure");
444 break;
445 default:
446 ND_PRINT(" proto: %u", auth_proto);
447 break;
448 }
449 tp++;
450 auth_alg = GET_U_1(tp);
451 switch (auth_alg) {
452 case DH6OPT_AUTHALG_HMACMD5:
453 /* XXX: may depend on the protocol */
454 ND_PRINT(", alg: HMAC-MD5");
455 break;
456 default:
457 ND_PRINT(", alg: %u", auth_alg);
458 break;
459 }
460 tp++;
461 auth_rdm = GET_U_1(tp);
462 switch (auth_rdm) {
463 case DH6OPT_AUTHRDM_MONOCOUNTER:
464 ND_PRINT(", RDM: mono");
465 break;
466 default:
467 ND_PRINT(", RDM: %u", auth_rdm);
468 break;
469 }
470 tp++;
471 ND_PRINT(", RD:");
472 for (i = 0; i < 4; i++, tp += 2)
473 ND_PRINT(" %04x", GET_BE_U_2(tp));
474
475 /* protocol dependent part */
476 authinfolen = optlen - 11;
477 switch (auth_proto) {
478 case DH6OPT_AUTHPROTO_DELAYED:
479 if (authinfolen == 0)
480 break;
481 if (authinfolen < 20) {
482 ND_PRINT(" ??");
483 break;
484 }
485 authrealmlen = authinfolen - 20;
486 if (authrealmlen > 0) {
487 ND_PRINT(", realm: ");
488 }
489 for (i = 0; i < authrealmlen; i++, tp++)
490 ND_PRINT("%02x", GET_U_1(tp));
491 ND_PRINT(", key ID: %08x", GET_BE_U_4(tp));
492 tp += 4;
493 ND_PRINT(", HMAC-MD5:");
494 for (i = 0; i < 4; i++, tp+= 4)
495 ND_PRINT(" %08x", GET_BE_U_4(tp));
496 break;
497 case DH6OPT_AUTHPROTO_RECONFIG:
498 if (authinfolen != 17) {
499 ND_PRINT(" ??");
500 break;
501 }
502 switch (GET_U_1(tp)) {
503 case DH6OPT_AUTHRECONFIG_KEY:
504 ND_PRINT(" reconfig-key");
505 break;
506 case DH6OPT_AUTHRECONFIG_HMACMD5:
507 ND_PRINT(" type: HMAC-MD5");
508 break;
509 default:
510 ND_PRINT(" type: ??");
511 break;
512 }
513 tp++;
514 ND_PRINT(" value:");
515 for (i = 0; i < 4; i++, tp+= 4)
516 ND_PRINT(" %08x", GET_BE_U_4(tp));
517 break;
518 default:
519 ND_PRINT(" ??");
520 break;
521 }
522
523 ND_PRINT(")");
524 break;
525 case DH6OPT_RAPID_COMMIT: /* nothing todo */
526 ND_PRINT(")");
527 break;
528 case DH6OPT_INTERFACE_ID:
529 case DH6OPT_SUBSCRIBER_ID:
530 /*
531 * Since we cannot predict the encoding, print hex dump
532 * at most 10 characters.
533 */
534 tp = (const u_char *)(dh6o + 1);
535 ND_PRINT(" ");
536 for (i = 0; i < optlen && i < 10; i++)
537 ND_PRINT("%02x", GET_U_1(tp + i));
538 ND_PRINT("...)");
539 break;
540 case DH6OPT_RECONF_MSG:
541 if (optlen != 1) {
542 ND_PRINT(" ?)");
543 break;
544 }
545 tp = (const u_char *)(dh6o + 1);
546 dh6_reconf_type = GET_U_1(tp);
547 switch (dh6_reconf_type) {
548 case DH6_RENEW:
549 ND_PRINT(" for renew)");
550 break;
551 case DH6_INFORM_REQ:
552 ND_PRINT(" for inf-req)");
553 break;
554 default:
555 ND_PRINT(" for ?\?\?(%02x))", dh6_reconf_type);
556 break;
557 }
558 break;
559 case DH6OPT_RECONF_ACCEPT: /* nothing todo */
560 ND_PRINT(")");
561 break;
562 case DH6OPT_SIP_SERVER_A:
563 case DH6OPT_DNS_SERVERS:
564 case DH6OPT_SNTP_SERVERS:
565 case DH6OPT_NIS_SERVERS:
566 case DH6OPT_NISP_SERVERS:
567 case DH6OPT_BCMCS_SERVER_A:
568 case DH6OPT_PANA_AGENT:
569 case DH6OPT_LQ_CLIENT_LINK:
570 if (optlen % 16) {
571 ND_PRINT(" ?)");
572 break;
573 }
574 tp = (const u_char *)(dh6o + 1);
575 for (i = 0; i < optlen; i += 16)
576 ND_PRINT(" %s", GET_IP6ADDR_STRING(tp + i));
577 ND_PRINT(")");
578 break;
579 case DH6OPT_SIP_SERVER_D:
580 case DH6OPT_DOMAIN_LIST:
581 tp = (const u_char *)(dh6o + 1);
582 while (tp < cp + sizeof(*dh6o) + optlen) {
583 ND_PRINT(" ");
584 if ((tp = fqdn_print(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL)
585 goto trunc;
586 }
587 ND_PRINT(")");
588 break;
589 case DH6OPT_STATUS_CODE:
590 if (optlen < 2) {
591 ND_PRINT(" ?)");
592 break;
593 }
594 tp = (const u_char *)(dh6o + 1);
595 ND_PRINT(" %s)", dhcp6stcode(GET_BE_U_2(tp)));
596 break;
597 case DH6OPT_IA_NA:
598 case DH6OPT_IA_PD:
599 if (optlen < 12) {
600 ND_PRINT(" ?)");
601 break;
602 }
603 tp = (const u_char *)(dh6o + 1);
604 ND_PRINT(" IAID:%u T1:%u T2:%u",
605 GET_BE_U_4(tp),
606 GET_BE_U_4(tp + 4),
607 GET_BE_U_4(tp + 8));
608 if (optlen > 12) {
609 /* there are sub-options */
610 dhcp6opt_print(ndo, tp + 12, tp + optlen);
611 }
612 ND_PRINT(")");
613 break;
614 case DH6OPT_IA_TA:
615 if (optlen < 4) {
616 ND_PRINT(" ?)");
617 break;
618 }
619 tp = (const u_char *)(dh6o + 1);
620 ND_PRINT(" IAID:%u", GET_BE_U_4(tp));
621 if (optlen > 4) {
622 /* there are sub-options */
623 dhcp6opt_print(ndo, tp + 4, tp + optlen);
624 }
625 ND_PRINT(")");
626 break;
627 case DH6OPT_IA_PD_PREFIX:
628 if (optlen < 25) {
629 ND_PRINT(" ?)");
630 break;
631 }
632 tp = (const u_char *)(dh6o + 1);
633 ND_PRINT(" %s/%u", GET_IP6ADDR_STRING(tp + 9),
634 GET_U_1(tp + 8));
635 ND_PRINT(" pltime:%u vltime:%u",
636 GET_BE_U_4(tp),
637 GET_BE_U_4(tp + 4));
638 if (optlen > 25) {
639 /* there are sub-options */
640 dhcp6opt_print(ndo, tp + 25, tp + optlen);
641 }
642 ND_PRINT(")");
643 break;
644 case DH6OPT_LIFETIME:
645 case DH6OPT_CLT_TIME:
646 if (optlen != 4) {
647 ND_PRINT(" ?)");
648 break;
649 }
650 tp = (const u_char *)(dh6o + 1);
651 ND_PRINT(" %u)", GET_BE_U_4(tp));
652 break;
653 case DH6OPT_REMOTE_ID:
654 if (optlen < 4) {
655 ND_PRINT(" ?)");
656 break;
657 }
658 tp = (const u_char *)(dh6o + 1);
659 ND_PRINT(" %u ", GET_BE_U_4(tp));
660 /*
661 * Print hex dump first 10 characters.
662 */
663 for (i = 4; i < optlen && i < 14; i++)
664 ND_PRINT("%02x", GET_U_1(tp + i));
665 ND_PRINT("...)");
666 break;
667 case DH6OPT_LQ_QUERY:
668 if (optlen < 17) {
669 ND_PRINT(" ?)");
670 break;
671 }
672 tp = (const u_char *)(dh6o + 1);
673 dh6_lq_query_type = GET_U_1(tp);
674 switch (dh6_lq_query_type) {
675 case 1:
676 ND_PRINT(" by-address");
677 break;
678 case 2:
679 ND_PRINT(" by-clientID");
680 break;
681 default:
682 ND_PRINT(" type_%u", dh6_lq_query_type);
683 break;
684 }
685 ND_PRINT(" %s", GET_IP6ADDR_STRING(tp + 1));
686 if (optlen > 17) {
687 /* there are query-options */
688 dhcp6opt_print(ndo, tp + 17, tp + optlen);
689 }
690 ND_PRINT(")");
691 break;
692 case DH6OPT_CLIENT_DATA:
693 tp = (const u_char *)(dh6o + 1);
694 if (optlen > 0) {
695 /* there are encapsulated options */
696 dhcp6opt_print(ndo, tp, tp + optlen);
697 }
698 ND_PRINT(")");
699 break;
700 case DH6OPT_LQ_RELAY_DATA:
701 if (optlen < 16) {
702 ND_PRINT(" ?)");
703 break;
704 }
705 tp = (const u_char *)(dh6o + 1);
706 ND_PRINT(" %s ", GET_IP6ADDR_STRING(tp));
707 /*
708 * Print hex dump first 10 characters.
709 */
710 for (i = 16; i < optlen && i < 26; i++)
711 ND_PRINT("%02x", GET_U_1(tp + i));
712 ND_PRINT("...)");
713 break;
714 case DH6OPT_NTP_SERVER:
715 if (optlen < 4) {
716 ND_PRINT(" ?)");
717 break;
718 }
719 tp = (const u_char *)(dh6o + 1);
720 while (tp < cp + sizeof(*dh6o) + optlen - 4) {
721 subopt_code = GET_BE_U_2(tp);
722 tp += 2;
723 subopt_len = GET_BE_U_2(tp);
724 tp += 2;
725 if (tp + subopt_len > cp + sizeof(*dh6o) + optlen)
726 goto trunc;
727 ND_PRINT(" subopt:%u", subopt_code);
728 switch (subopt_code) {
729 case DH6OPT_NTP_SUBOPTION_SRV_ADDR:
730 case DH6OPT_NTP_SUBOPTION_MC_ADDR:
731 if (subopt_len != 16) {
732 ND_PRINT(" ?");
733 break;
734 }
735 ND_PRINT(" %s", GET_IP6ADDR_STRING(tp));
736 break;
737 case DH6OPT_NTP_SUBOPTION_SRV_FQDN:
738 ND_PRINT(" ");
739 if (fqdn_print(ndo, tp, tp + subopt_len) == NULL)
740 goto trunc;
741 break;
742 default:
743 ND_PRINT(" ?");
744 break;
745 }
746 tp += subopt_len;
747 }
748 ND_PRINT(")");
749 break;
750 case DH6OPT_AFTR_NAME:
751 if (optlen < 3) {
752 ND_PRINT(" ?)");
753 break;
754 }
755 tp = (const u_char *)(dh6o + 1);
756 remain_len = optlen;
757 ND_PRINT(" ");
758 /* Encoding is described in section 3.1 of RFC 1035 */
759 while (remain_len && GET_U_1(tp)) {
760 label_len = GET_U_1(tp);
761 tp++;
762 if (label_len < remain_len - 1) {
763 nd_printjnp(ndo, tp, label_len);
764 tp += label_len;
765 remain_len -= (label_len + 1);
766 if(GET_U_1(tp)) ND_PRINT(".");
767 } else {
768 ND_PRINT(" ?");
769 break;
770 }
771 }
772 ND_PRINT(")");
773 break;
774 case DH6OPT_NEW_POSIX_TIMEZONE: /* all three of these options */
775 case DH6OPT_NEW_TZDB_TIMEZONE: /* are encoded similarly */
776 case DH6OPT_MUDURL: /* although GMT might not work */
777 if (optlen < 5) {
778 ND_PRINT(" ?)");
779 break;
780 }
781 tp = (const u_char *)(dh6o + 1);
782 ND_PRINT(" ");
783 nd_printjnp(ndo, tp, optlen);
784 ND_PRINT(")");
785 break;
786
787 default:
788 ND_PRINT(")");
789 break;
790 }
791
792 cp += sizeof(*dh6o) + optlen;
793 }
794 return;
795
796 trunc:
797 nd_print_trunc(ndo);
798 }
799
800 /*
801 * Print dhcp6 packets
802 */
803 void
804 dhcp6_print(netdissect_options *ndo,
805 const u_char *cp, u_int length)
806 {
807 const struct dhcp6 *dh6;
808 const struct dhcp6_relay *dh6relay;
809 uint8_t msgtype;
810 const u_char *ep;
811 const u_char *extp;
812 const char *name;
813
814 ndo->ndo_protocol = "dhcp6";
815 ND_PRINT("dhcp6");
816
817 ep = ndo->ndo_snapend;
818 if (cp + length < ep)
819 ep = cp + length;
820
821 dh6 = (const struct dhcp6 *)cp;
822 dh6relay = (const struct dhcp6_relay *)cp;
823 ND_TCHECK_4(dh6->dh6_msgtypexid.xid);
824 msgtype = GET_U_1(dh6->dh6_msgtypexid.msgtype);
825 name = tok2str(dh6_msgtype_str, "msgtype-%u", msgtype);
826
827 if (!ndo->ndo_vflag) {
828 ND_PRINT(" %s", name);
829 return;
830 }
831
832 /* XXX relay agent messages have to be handled differently */
833
834 ND_PRINT(" %s (", name); /*)*/
835 if (msgtype != DH6_RELAY_FORW && msgtype != DH6_RELAY_REPLY) {
836 ND_PRINT("xid=%x",
837 GET_BE_U_4(dh6->dh6_msgtypexid.xid) & DH6_XIDMASK);
838 extp = (const u_char *)(dh6 + 1);
839 dhcp6opt_print(ndo, extp, ep);
840 } else { /* relay messages */
841 ND_PRINT("linkaddr=%s", GET_IP6ADDR_STRING(dh6relay->dh6relay_linkaddr));
842
843 ND_PRINT(" peeraddr=%s", GET_IP6ADDR_STRING(dh6relay->dh6relay_peeraddr));
844
845 dhcp6opt_print(ndo, (const u_char *)(dh6relay + 1), ep);
846 }
847 /*(*/
848 ND_PRINT(")");
849 return;
850
851 trunc:
852 nd_print_trunc(ndo);
853 }
[mirror] the TCPdump network dissector