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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 #include <config.h>
47
48 #include "netdissect-stdinc.h"
49
50 #include "netdissect.h"
51 #include "addrtoname.h"
52 #include "extract.h"
53
54 /* lease duration */
55 #define DHCP6_DURATION_INFINITE 0xffffffff
56
57 /* Error Values */
58 #define DH6ERR_FAILURE 16
59 #define DH6ERR_AUTHFAIL 17
60 #define DH6ERR_POORLYFORMED 18
61 #define DH6ERR_UNAVAIL 19
62 #define DH6ERR_OPTUNAVAIL 20
63
64 /* Message type */
65 #define DH6_SOLICIT 1
66 #define DH6_ADVERTISE 2
67 #define DH6_REQUEST 3
68 #define DH6_CONFIRM 4
69 #define DH6_RENEW 5
70 #define DH6_REBIND 6
71 #define DH6_REPLY 7
72 #define DH6_RELEASE 8
73 #define DH6_DECLINE 9
74 #define DH6_RECONFIGURE 10
75 #define DH6_INFORM_REQ 11
76 #define DH6_RELAY_FORW 12
77 #define DH6_RELAY_REPLY 13
78 #define DH6_LEASEQUERY 14
79 #define DH6_LQ_REPLY 15
80
81 static const struct tok dh6_msgtype_str[] = {
82 { DH6_SOLICIT, "solicit" },
83 { DH6_ADVERTISE, "advertise" },
84 { DH6_REQUEST, "request" },
85 { DH6_CONFIRM, "confirm" },
86 { DH6_RENEW, "renew" },
87 { DH6_REBIND, "rebind" },
88 { DH6_REPLY, "reply" },
89 { DH6_RELEASE, "release" },
90 { DH6_DECLINE, "decline" },
91 { DH6_RECONFIGURE, "reconfigure" },
92 { DH6_INFORM_REQ, "inf-req" },
93 { DH6_RELAY_FORW, "relay-fwd" },
94 { DH6_RELAY_REPLY, "relay-reply" },
95 { DH6_LEASEQUERY, "leasequery" },
96 { DH6_LQ_REPLY, "leasequery-reply" },
97 { 0, NULL }
98 };
99
100 /* DHCP6 base packet format */
101 struct dhcp6 {
102 union {
103 nd_uint8_t msgtype;
104 nd_uint32_t xid;
105 } dh6_msgtypexid;
106 /* options follow */
107 };
108 #define DH6_XIDMASK 0x00ffffff
109
110 /* DHCPv6 relay messages */
111 struct dhcp6_relay {
112 nd_uint8_t dh6relay_msgtype;
113 nd_uint8_t dh6relay_hcnt;
114 nd_ipv6 dh6relay_linkaddr; /* XXX: badly aligned */
115 nd_ipv6 dh6relay_peeraddr;
116 /* options follow */
117 };
118
119 /* options */
120 #define DH6OPT_CLIENTID 1
121 #define DH6OPT_SERVERID 2
122 # define DUID_LLT 1 /* RFC8415 */
123 # define DUID_EN 2 /* RFC8415 */
124 # define DUID_LL 3 /* RFC8415 */
125 # define DUID_UUID 4 /* RFC6355 */
126 #define DH6OPT_IA_NA 3
127 #define DH6OPT_IA_TA 4
128 #define DH6OPT_IA_ADDR 5
129 #define DH6OPT_ORO 6
130 #define DH6OPT_PREFERENCE 7
131 # define DH6OPT_PREF_MAX 255
132 #define DH6OPT_ELAPSED_TIME 8
133 #define DH6OPT_RELAY_MSG 9
134 /*#define DH6OPT_SERVER_MSG 10 deprecated */
135 #define DH6OPT_AUTH 11
136 # define DH6OPT_AUTHPROTO_DELAYED 2
137 # define DH6OPT_AUTHPROTO_RECONFIG 3
138 # define DH6OPT_AUTHALG_HMACMD5 1
139 # define DH6OPT_AUTHRDM_MONOCOUNTER 0
140 # define DH6OPT_AUTHRECONFIG_KEY 1
141 # define DH6OPT_AUTHRECONFIG_HMACMD5 2
142 #define DH6OPT_UNICAST 12
143 #define DH6OPT_STATUS_CODE 13
144 # define DH6OPT_STCODE_SUCCESS 0
145 # define DH6OPT_STCODE_UNSPECFAIL 1
146 # define DH6OPT_STCODE_NOADDRAVAIL 2
147 # define DH6OPT_STCODE_NOBINDING 3
148 # define DH6OPT_STCODE_NOTONLINK 4
149 # define DH6OPT_STCODE_USEMULTICAST 5
150 # define DH6OPT_STCODE_NOPREFIXAVAIL 6
151 # define DH6OPT_STCODE_UNKNOWNQUERYTYPE 7
152 # define DH6OPT_STCODE_MALFORMEDQUERY 8
153 # define DH6OPT_STCODE_NOTCONFIGURED 9
154 # define DH6OPT_STCODE_NOTALLOWED 10
155 #define DH6OPT_RAPID_COMMIT 14
156 #define DH6OPT_USER_CLASS 15
157 #define DH6OPT_VENDOR_CLASS 16
158 #define DH6OPT_VENDOR_OPTS 17
159 #define DH6OPT_INTERFACE_ID 18
160 #define DH6OPT_RECONF_MSG 19
161 #define DH6OPT_RECONF_ACCEPT 20
162 #define DH6OPT_SIP_SERVER_D 21
163 #define DH6OPT_SIP_SERVER_A 22
164 #define DH6OPT_DNS_SERVERS 23
165 #define DH6OPT_DOMAIN_LIST 24
166 #define DH6OPT_IA_PD 25
167 #define DH6OPT_IA_PD_PREFIX 26
168 #define DH6OPT_NIS_SERVERS 27
169 #define DH6OPT_NISP_SERVERS 28
170 #define DH6OPT_NIS_NAME 29
171 #define DH6OPT_NISP_NAME 30
172 #define DH6OPT_SNTP_SERVERS 31
173 #define DH6OPT_LIFETIME 32
174 #define DH6OPT_BCMCS_SERVER_D 33
175 #define DH6OPT_BCMCS_SERVER_A 34
176 #define DH6OPT_GEOCONF_CIVIC 36
177 #define DH6OPT_REMOTE_ID 37
178 #define DH6OPT_SUBSCRIBER_ID 38
179 #define DH6OPT_CLIENT_FQDN 39
180 #define DH6OPT_PANA_AGENT 40
181 #define DH6OPT_NEW_POSIX_TIMEZONE 41
182 #define DH6OPT_NEW_TZDB_TIMEZONE 42
183 #define DH6OPT_ERO 43
184 #define DH6OPT_LQ_QUERY 44
185 #define DH6OPT_CLIENT_DATA 45
186 #define DH6OPT_CLT_TIME 46
187 #define DH6OPT_LQ_RELAY_DATA 47
188 #define DH6OPT_LQ_CLIENT_LINK 48
189 #define DH6OPT_NTP_SERVER 56
190 # define DH6OPT_NTP_SUBOPTION_SRV_ADDR 1
191 # define DH6OPT_NTP_SUBOPTION_MC_ADDR 2
192 # define DH6OPT_NTP_SUBOPTION_SRV_FQDN 3
193 #define DH6OPT_BOOTFILE_URL 59 /* RFC5970 */
194 #define DH6OPT_AFTR_NAME 64
195 #define DH6OPT_MUDURL 112
196 #define DH6OPT_SZTP_REDIRECT 136 /* RFC8572 */
197
198 static const struct tok dh6opt_str[] = {
199 { DH6OPT_CLIENTID, "client-ID" },
200 { DH6OPT_SERVERID, "server-ID" },
201 { DH6OPT_IA_NA, "IA_NA" },
202 { DH6OPT_IA_TA, "IA_TA" },
203 { DH6OPT_IA_ADDR, "IA_ADDR" },
204 { DH6OPT_ORO, "option-request" },
205 { DH6OPT_PREFERENCE, "preference" },
206 { DH6OPT_ELAPSED_TIME, "elapsed-time" },
207 { DH6OPT_RELAY_MSG, "relay-message" },
208 { DH6OPT_AUTH, "authentication" },
209 { DH6OPT_UNICAST, "server-unicast" },
210 { DH6OPT_STATUS_CODE, "status-code" },
211 { DH6OPT_RAPID_COMMIT, "rapid-commit" },
212 { DH6OPT_USER_CLASS, "user-class" },
213 { DH6OPT_VENDOR_CLASS, "vendor-class" },
214 { DH6OPT_VENDOR_OPTS, "vendor-specific-info" },
215 { DH6OPT_INTERFACE_ID, "interface-ID" },
216 { DH6OPT_RECONF_MSG, "reconfigure-message" },
217 { DH6OPT_RECONF_ACCEPT, "reconfigure-accept" },
218 { DH6OPT_SIP_SERVER_D, "SIP-servers-domain" },
219 { DH6OPT_SIP_SERVER_A, "SIP-servers-address" },
220 { DH6OPT_DNS_SERVERS, "DNS-server" },
221 { DH6OPT_DOMAIN_LIST, "DNS-search-list" },
222 { DH6OPT_IA_PD, "IA_PD" },
223 { DH6OPT_IA_PD_PREFIX, "IA_PD-prefix" },
224 { DH6OPT_SNTP_SERVERS, "SNTP-servers" },
225 { DH6OPT_LIFETIME, "lifetime" },
226 { DH6OPT_NIS_SERVERS, "NIS-server" },
227 { DH6OPT_NISP_SERVERS, "NIS+-server" },
228 { DH6OPT_NIS_NAME, "NIS-domain-name" },
229 { DH6OPT_NISP_NAME, "NIS+-domain-name" },
230 { DH6OPT_BCMCS_SERVER_D, "BCMCS-domain-name" },
231 { DH6OPT_BCMCS_SERVER_A, "BCMCS-server" },
232 { DH6OPT_GEOCONF_CIVIC, "Geoconf-Civic" },
233 { DH6OPT_REMOTE_ID, "Remote-ID" },
234 { DH6OPT_SUBSCRIBER_ID, "Subscriber-ID" },
235 { DH6OPT_CLIENT_FQDN, "Client-FQDN" },
236 { DH6OPT_PANA_AGENT, "PANA-agent" },
237 { DH6OPT_NEW_POSIX_TIMEZONE, "POSIX-timezone" },
238 { DH6OPT_NEW_TZDB_TIMEZONE, "POSIX-tz-database" },
239 { DH6OPT_ERO, "Echo-request-option" },
240 { DH6OPT_LQ_QUERY, "Lease-query" },
241 { DH6OPT_CLIENT_DATA, "LQ-client-data" },
242 { DH6OPT_CLT_TIME, "Clt-time" },
243 { DH6OPT_LQ_RELAY_DATA, "LQ-relay-data" },
244 { DH6OPT_LQ_CLIENT_LINK, "LQ-client-link" },
245 { DH6OPT_NTP_SERVER, "NTP-server" },
246 { DH6OPT_BOOTFILE_URL, "Bootfile-URL" },
247 { DH6OPT_AFTR_NAME, "AFTR-Name" },
248 { DH6OPT_MUDURL, "MUD-URL" },
249 { DH6OPT_SZTP_REDIRECT, "SZTP-redirect" },
250 { 0, NULL }
251 };
252
253 static const struct tok dh6opt_stcode_str[] = {
254 { DH6OPT_STCODE_SUCCESS, "Success" }, /* RFC3315 */
255 { DH6OPT_STCODE_UNSPECFAIL, "UnspecFail" }, /* RFC3315 */
256 { DH6OPT_STCODE_NOADDRAVAIL, "NoAddrsAvail" }, /* RFC3315 */
257 { DH6OPT_STCODE_NOBINDING, "NoBinding" }, /* RFC3315 */
258 { DH6OPT_STCODE_NOTONLINK, "NotOnLink" }, /* RFC3315 */
259 { DH6OPT_STCODE_USEMULTICAST, "UseMulticast" }, /* RFC3315 */
260 { DH6OPT_STCODE_NOPREFIXAVAIL, "NoPrefixAvail" }, /* RFC3633 */
261 { DH6OPT_STCODE_UNKNOWNQUERYTYPE, "UnknownQueryType" }, /* RFC5007 */
262 { DH6OPT_STCODE_MALFORMEDQUERY, "MalformedQuery" }, /* RFC5007 */
263 { DH6OPT_STCODE_NOTCONFIGURED, "NotConfigured" }, /* RFC5007 */
264 { DH6OPT_STCODE_NOTALLOWED, "NotAllowed" }, /* RFC5007 */
265 { 0, NULL }
266 };
267
268 struct dhcp6opt {
269 nd_uint16_t dh6opt_type;
270 nd_uint16_t dh6opt_len;
271 /* type-dependent data follows */
272 };
273
274 static const char *
275 dhcp6stcode(const uint16_t code)
276 {
277 return code > 255 ? "INVALID code" : tok2str(dh6opt_stcode_str, "code%u", code);
278 }
279
280 static void
281 dhcp6opt_print(netdissect_options *ndo,
282 const u_char *cp, const u_char *ep)
283 {
284 const struct dhcp6opt *dh6o;
285 const u_char *tp;
286 u_int i;
287 uint16_t opttype;
288 u_int optlen;
289 uint8_t auth_proto;
290 uint8_t auth_alg;
291 uint8_t auth_rdm;
292 u_int authinfolen, authrealmlen;
293 u_int remain_len; /* Length of remaining options */
294 u_int label_len; /* Label length */
295 uint16_t subopt_code;
296 uint16_t subopt_len;
297 uint8_t dh6_reconf_type;
298 uint8_t dh6_lq_query_type;
299 u_int first_list_value;
300 u_int max_char;
301
302 if (cp == ep)
303 return;
304 while (cp < ep) {
305 if (ep < cp + sizeof(*dh6o))
306 goto trunc;
307 dh6o = (const struct dhcp6opt *)cp;
308 ND_TCHECK_SIZE(dh6o);
309 optlen = GET_BE_U_2(dh6o->dh6opt_len);
310 if (ep < cp + sizeof(*dh6o) + optlen)
311 goto trunc;
312 opttype = GET_BE_U_2(dh6o->dh6opt_type);
313 ND_PRINT(" (%s", tok2str(dh6opt_str, "opt_%u", opttype));
314 ND_TCHECK_LEN(cp + sizeof(*dh6o), optlen);
315 switch (opttype) {
316 case DH6OPT_CLIENTID:
317 case DH6OPT_SERVERID:
318 if (optlen < 2) {
319 /*(*/
320 ND_PRINT(" ?)");
321 break;
322 }
323 tp = (const u_char *)(dh6o + 1);
324 switch (GET_BE_U_2(tp)) {
325 case DUID_LLT:
326 if (optlen >= 2 + 6) {
327 ND_PRINT(" hwaddr/time type %u time %u ",
328 GET_BE_U_2(tp + 2),
329 GET_BE_U_4(tp + 4));
330 for (i = 8; i < optlen; i++)
331 ND_PRINT("%02x",
332 GET_U_1(tp + i));
333 /*(*/
334 ND_PRINT(")");
335 } else {
336 /*(*/
337 ND_PRINT(" ?)");
338 }
339 break;
340 case DUID_EN:
341 if (optlen >= 2 + 4) {
342 ND_PRINT(" enterprise %u ", GET_BE_U_4(tp + 2));
343 for (i = 2 + 4; i < optlen; i++)
344 ND_PRINT("%02x",
345 GET_U_1(tp + i));
346 /*(*/
347 ND_PRINT(")");
348 } else {
349 /*(*/
350 ND_PRINT(" ?)");
351 }
352 break;
353 case DUID_LL:
354 if (optlen >= 2 + 2) {
355 ND_PRINT(" hwaddr type %u ",
356 GET_BE_U_2(tp + 2));
357 for (i = 4; i < optlen; i++)
358 ND_PRINT("%02x",
359 GET_U_1(tp + i));
360 /*(*/
361 ND_PRINT(")");
362 } else {
363 /*(*/
364 ND_PRINT(" ?)");
365 }
366 break;
367 case DUID_UUID:
368 ND_PRINT(" uuid ");
369 if (optlen == 2 + 16) {
370 for (i = 2; i < optlen; i++)
371 ND_PRINT("%02x",
372 GET_U_1(tp + i));
373 /*(*/
374 ND_PRINT(")");
375 } else {
376 /*(*/
377 ND_PRINT(" ?)");
378 }
379 break;
380 default:
381 ND_PRINT(" type %u)", GET_BE_U_2(tp));
382 break;
383 }
384 break;
385 case DH6OPT_IA_ADDR:
386 if (optlen < 24) {
387 /*(*/
388 ND_PRINT(" ?)");
389 break;
390 }
391 tp = (const u_char *)(dh6o + 1);
392 ND_PRINT(" %s", GET_IP6ADDR_STRING(tp));
393 ND_PRINT(" pltime:%u vltime:%u",
394 GET_BE_U_4(tp + 16),
395 GET_BE_U_4(tp + 20));
396 if (optlen > 24) {
397 /* there are sub-options */
398 dhcp6opt_print(ndo, tp + 24, tp + optlen);
399 }
400 ND_PRINT(")");
401 break;
402 case DH6OPT_ORO:
403 case DH6OPT_ERO:
404 if (optlen % 2) {
405 ND_PRINT(" ?)");
406 break;
407 }
408 tp = (const u_char *)(dh6o + 1);
409 for (i = 0; i < optlen; i += 2) {
410 ND_PRINT(" %s",
411 tok2str(dh6opt_str, "opt_%u", GET_BE_U_2(tp + i)));
412 }
413 ND_PRINT(")");
414 break;
415 case DH6OPT_PREFERENCE:
416 if (optlen != 1) {
417 ND_PRINT(" ?)");
418 break;
419 }
420 tp = (const u_char *)(dh6o + 1);
421 ND_PRINT(" %u)", GET_U_1(tp));
422 break;
423 case DH6OPT_ELAPSED_TIME:
424 if (optlen != 2) {
425 ND_PRINT(" ?)");
426 break;
427 }
428 tp = (const u_char *)(dh6o + 1);
429 ND_PRINT(" %u)", GET_BE_U_2(tp));
430 break;
431 case DH6OPT_RELAY_MSG:
432 {
433 const u_char *snapend_save;
434
435 ND_PRINT(" (");
436 tp = (const u_char *)(dh6o + 1);
437 /*
438 * Update the snapend to the end of the option before
439 * calling recursively dhcp6_print() for the nested
440 * packet. Other options may be present after the
441 * nested DHCPv6 packet. This prevents that, in
442 * dhcp6_print(), for the nested DHCPv6 packet, the
443 * remaining length < remaining caplen.
444 */
445 snapend_save = ndo->ndo_snapend;
446 ndo->ndo_snapend = ND_MIN(tp + optlen, ndo->ndo_snapend);
447 dhcp6_print(ndo, tp, optlen);
448 ndo->ndo_snapend = snapend_save;
449 ND_PRINT(")");
450 break;
451 }
452 case DH6OPT_AUTH:
453 if (optlen < 11) {
454 ND_PRINT(" ?)");
455 break;
456 }
457 tp = (const u_char *)(dh6o + 1);
458 auth_proto = GET_U_1(tp);
459 switch (auth_proto) {
460 case DH6OPT_AUTHPROTO_DELAYED:
461 ND_PRINT(" proto: delayed");
462 break;
463 case DH6OPT_AUTHPROTO_RECONFIG:
464 ND_PRINT(" proto: reconfigure");
465 break;
466 default:
467 ND_PRINT(" proto: %u", auth_proto);
468 break;
469 }
470 tp++;
471 auth_alg = GET_U_1(tp);
472 switch (auth_alg) {
473 case DH6OPT_AUTHALG_HMACMD5:
474 /* XXX: may depend on the protocol */
475 ND_PRINT(", alg: HMAC-MD5");
476 break;
477 default:
478 ND_PRINT(", alg: %u", auth_alg);
479 break;
480 }
481 tp++;
482 auth_rdm = GET_U_1(tp);
483 switch (auth_rdm) {
484 case DH6OPT_AUTHRDM_MONOCOUNTER:
485 ND_PRINT(", RDM: mono");
486 break;
487 default:
488 ND_PRINT(", RDM: %u", auth_rdm);
489 break;
490 }
491 tp++;
492 ND_PRINT(", RD:");
493 for (i = 0; i < 4; i++, tp += 2)
494 ND_PRINT(" %04x", GET_BE_U_2(tp));
495
496 /* protocol dependent part */
497 authinfolen = optlen - 11;
498 switch (auth_proto) {
499 case DH6OPT_AUTHPROTO_DELAYED:
500 if (authinfolen == 0)
501 break;
502 if (authinfolen < 20) {
503 ND_PRINT(" ??");
504 break;
505 }
506 authrealmlen = authinfolen - 20;
507 if (authrealmlen > 0) {
508 ND_PRINT(", realm: ");
509 }
510 for (i = 0; i < authrealmlen; i++, tp++)
511 ND_PRINT("%02x", GET_U_1(tp));
512 ND_PRINT(", key ID: %08x", GET_BE_U_4(tp));
513 tp += 4;
514 ND_PRINT(", HMAC-MD5:");
515 for (i = 0; i < 4; i++, tp+= 4)
516 ND_PRINT(" %08x", GET_BE_U_4(tp));
517 break;
518 case DH6OPT_AUTHPROTO_RECONFIG:
519 if (authinfolen != 17) {
520 ND_PRINT(" ??");
521 break;
522 }
523 switch (GET_U_1(tp)) {
524 case DH6OPT_AUTHRECONFIG_KEY:
525 ND_PRINT(" reconfig-key");
526 break;
527 case DH6OPT_AUTHRECONFIG_HMACMD5:
528 ND_PRINT(" type: HMAC-MD5");
529 break;
530 default:
531 ND_PRINT(" type: ??");
532 break;
533 }
534 tp++;
535 ND_PRINT(" value:");
536 for (i = 0; i < 4; i++, tp+= 4)
537 ND_PRINT(" %08x", GET_BE_U_4(tp));
538 break;
539 default:
540 ND_PRINT(" ??");
541 break;
542 }
543
544 ND_PRINT(")");
545 break;
546 case DH6OPT_RAPID_COMMIT: /* nothing todo */
547 ND_PRINT(")");
548 break;
549 case DH6OPT_INTERFACE_ID:
550 case DH6OPT_SUBSCRIBER_ID:
551 tp = (const u_char *)(dh6o + 1);
552 ND_PRINT(" ");
553 /*
554 * if ndo_vflag < 2, print hex dump up to 10 characters.
555 */
556 if (ndo->ndo_vflag < 2)
557 max_char = ND_MIN(optlen, 10);
558 else
559 max_char = optlen;
560 for (i = 0; i < max_char; i++)
561 ND_PRINT("%02x", GET_U_1(tp + i));
562 if (i < optlen)
563 ND_PRINT("...");
564 ND_PRINT(")");
565 break;
566 case DH6OPT_RECONF_MSG:
567 if (optlen != 1) {
568 ND_PRINT(" ?)");
569 break;
570 }
571 tp = (const u_char *)(dh6o + 1);
572 dh6_reconf_type = GET_U_1(tp);
573 switch (dh6_reconf_type) {
574 case DH6_RENEW:
575 ND_PRINT(" for renew)");
576 break;
577 case DH6_INFORM_REQ:
578 ND_PRINT(" for inf-req)");
579 break;
580 default:
581 ND_PRINT(" for ?\?\?(%02x))", dh6_reconf_type);
582 break;
583 }
584 break;
585 case DH6OPT_RECONF_ACCEPT: /* nothing todo */
586 ND_PRINT(")");
587 break;
588 case DH6OPT_SIP_SERVER_A:
589 case DH6OPT_DNS_SERVERS:
590 case DH6OPT_SNTP_SERVERS:
591 case DH6OPT_NIS_SERVERS:
592 case DH6OPT_NISP_SERVERS:
593 case DH6OPT_BCMCS_SERVER_A:
594 case DH6OPT_PANA_AGENT:
595 case DH6OPT_LQ_CLIENT_LINK:
596 if (optlen % 16) {
597 ND_PRINT(" ?)");
598 break;
599 }
600 tp = (const u_char *)(dh6o + 1);
601 for (i = 0; i < optlen; i += 16)
602 ND_PRINT(" %s", GET_IP6ADDR_STRING(tp + i));
603 ND_PRINT(")");
604 break;
605 case DH6OPT_SIP_SERVER_D:
606 case DH6OPT_DOMAIN_LIST:
607 tp = (const u_char *)(dh6o + 1);
608 while (tp < cp + sizeof(*dh6o) + optlen) {
609 ND_PRINT(" ");
610 if ((tp = fqdn_print(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL)
611 goto trunc;
612 }
613 ND_PRINT(")");
614 break;
615 case DH6OPT_STATUS_CODE:
616 if (optlen < 2) {
617 ND_PRINT(" ?)");
618 break;
619 }
620 tp = (const u_char *)(dh6o + 1);
621 ND_PRINT(" %s)", dhcp6stcode(GET_BE_U_2(tp)));
622 break;
623 case DH6OPT_IA_NA:
624 case DH6OPT_IA_PD:
625 if (optlen < 12) {
626 ND_PRINT(" ?)");
627 break;
628 }
629 tp = (const u_char *)(dh6o + 1);
630 ND_PRINT(" IAID:%u T1:%u T2:%u",
631 GET_BE_U_4(tp),
632 GET_BE_U_4(tp + 4),
633 GET_BE_U_4(tp + 8));
634 if (optlen > 12) {
635 /* there are sub-options */
636 dhcp6opt_print(ndo, tp + 12, tp + optlen);
637 }
638 ND_PRINT(")");
639 break;
640 case DH6OPT_IA_TA:
641 if (optlen < 4) {
642 ND_PRINT(" ?)");
643 break;
644 }
645 tp = (const u_char *)(dh6o + 1);
646 ND_PRINT(" IAID:%u", GET_BE_U_4(tp));
647 if (optlen > 4) {
648 /* there are sub-options */
649 dhcp6opt_print(ndo, tp + 4, tp + optlen);
650 }
651 ND_PRINT(")");
652 break;
653 case DH6OPT_IA_PD_PREFIX:
654 if (optlen < 25) {
655 ND_PRINT(" ?)");
656 break;
657 }
658 tp = (const u_char *)(dh6o + 1);
659 ND_PRINT(" %s/%u", GET_IP6ADDR_STRING(tp + 9),
660 GET_U_1(tp + 8));
661 ND_PRINT(" pltime:%u vltime:%u",
662 GET_BE_U_4(tp),
663 GET_BE_U_4(tp + 4));
664 if (optlen > 25) {
665 /* there are sub-options */
666 dhcp6opt_print(ndo, tp + 25, tp + optlen);
667 }
668 ND_PRINT(")");
669 break;
670 case DH6OPT_LIFETIME:
671 case DH6OPT_CLT_TIME:
672 if (optlen != 4) {
673 ND_PRINT(" ?)");
674 break;
675 }
676 tp = (const u_char *)(dh6o + 1);
677 ND_PRINT(" %u)", GET_BE_U_4(tp));
678 break;
679 case DH6OPT_REMOTE_ID:
680 if (optlen < 4) {
681 ND_PRINT(" ?)");
682 break;
683 }
684 tp = (const u_char *)(dh6o + 1);
685 ND_PRINT(" enterprise %u ", GET_BE_U_4(tp));
686 tp += 4;
687 /*
688 * if ndo_vflag < 2, print hex dump up to 10 characters.
689 */
690 if (ndo->ndo_vflag < 2)
691 max_char = ND_MIN(optlen - 4, 10);
692 else
693 max_char = optlen - 4;
694 for (i = 0; i < max_char; i++)
695 ND_PRINT("%02x", GET_U_1(tp + i));
696 if (i < optlen - 4)
697 ND_PRINT("...");
698 ND_PRINT(")");
699 break;
700 case DH6OPT_LQ_QUERY:
701 if (optlen < 17) {
702 ND_PRINT(" ?)");
703 break;
704 }
705 tp = (const u_char *)(dh6o + 1);
706 dh6_lq_query_type = GET_U_1(tp);
707 switch (dh6_lq_query_type) {
708 case 1:
709 ND_PRINT(" by-address");
710 break;
711 case 2:
712 ND_PRINT(" by-clientID");
713 break;
714 default:
715 ND_PRINT(" type_%u", dh6_lq_query_type);
716 break;
717 }
718 ND_PRINT(" %s", GET_IP6ADDR_STRING(tp + 1));
719 if (optlen > 17) {
720 /* there are query-options */
721 dhcp6opt_print(ndo, tp + 17, tp + optlen);
722 }
723 ND_PRINT(")");
724 break;
725 case DH6OPT_CLIENT_DATA:
726 tp = (const u_char *)(dh6o + 1);
727 if (optlen > 0) {
728 /* there are encapsulated options */
729 dhcp6opt_print(ndo, tp, tp + optlen);
730 }
731 ND_PRINT(")");
732 break;
733 case DH6OPT_LQ_RELAY_DATA:
734 if (optlen < 16) {
735 ND_PRINT(" ?)");
736 break;
737 }
738 tp = (const u_char *)(dh6o + 1);
739 ND_PRINT(" %s ", GET_IP6ADDR_STRING(tp));
740 tp += 16;
741 /*
742 * if ndo_vflag < 2, print hex dump up to 10 characters.
743 */
744 if (ndo->ndo_vflag < 2)
745 max_char = ND_MIN(optlen - 16, 10);
746 else
747 max_char = optlen - 16;
748 for (i = 0; i < max_char; i++)
749 ND_PRINT("%02x", GET_U_1(tp + i));
750 if (i < optlen - 16)
751 ND_PRINT("...");
752 ND_PRINT(")");
753 break;
754 case DH6OPT_NTP_SERVER:
755 if (optlen < 4) {
756 ND_PRINT(" ?)");
757 break;
758 }
759 tp = (const u_char *)(dh6o + 1);
760 while (tp < cp + sizeof(*dh6o) + optlen - 4) {
761 subopt_code = GET_BE_U_2(tp);
762 tp += 2;
763 subopt_len = GET_BE_U_2(tp);
764 tp += 2;
765 if (tp + subopt_len > cp + sizeof(*dh6o) + optlen)
766 goto trunc;
767 ND_PRINT(" subopt:%u", subopt_code);
768 switch (subopt_code) {
769 case DH6OPT_NTP_SUBOPTION_SRV_ADDR:
770 case DH6OPT_NTP_SUBOPTION_MC_ADDR:
771 if (subopt_len != 16) {
772 ND_PRINT(" ?");
773 break;
774 }
775 ND_PRINT(" %s", GET_IP6ADDR_STRING(tp));
776 break;
777 case DH6OPT_NTP_SUBOPTION_SRV_FQDN:
778 ND_PRINT(" ");
779 if (fqdn_print(ndo, tp, tp + subopt_len) == NULL)
780 goto trunc;
781 break;
782 default:
783 ND_PRINT(" ?");
784 break;
785 }
786 tp += subopt_len;
787 }
788 ND_PRINT(")");
789 break;
790 case DH6OPT_AFTR_NAME:
791 if (optlen < 3) {
792 ND_PRINT(" ?)");
793 break;
794 }
795 tp = (const u_char *)(dh6o + 1);
796 remain_len = optlen;
797 ND_PRINT(" ");
798 /* Encoding is described in section 3.1 of RFC 1035 */
799 while (remain_len && GET_U_1(tp)) {
800 label_len = GET_U_1(tp);
801 tp++;
802 if (label_len < remain_len - 1) {
803 nd_printjnp(ndo, tp, label_len);
804 tp += label_len;
805 remain_len -= (label_len + 1);
806 if (GET_U_1(tp)) ND_PRINT(".");
807 } else {
808 ND_PRINT(" ?");
809 break;
810 }
811 }
812 ND_PRINT(")");
813 break;
814 case DH6OPT_NEW_POSIX_TIMEZONE: /* all three of these options */
815 case DH6OPT_NEW_TZDB_TIMEZONE: /* are encoded similarly */
816 case DH6OPT_MUDURL: /* although GMT might not work */
817 if (optlen < 5) {
818 ND_PRINT(" ?)");
819 break;
820 }
821 tp = (const u_char *)(dh6o + 1);
822 ND_PRINT(" ");
823 nd_printjnp(ndo, tp, optlen);
824 ND_PRINT(")");
825 break;
826
827 case DH6OPT_BOOTFILE_URL:
828 tp = (const u_char *)(dh6o + 1);
829 ND_PRINT(" ");
830 nd_printjn(ndo, tp, optlen);
831 ND_PRINT(")");
832 break;
833
834 case DH6OPT_SZTP_REDIRECT:
835 case DH6OPT_USER_CLASS:
836 ND_PRINT(" ");
837 tp = (const u_char *)(dh6o + 1);
838 first_list_value = TRUE;
839 remain_len = optlen;
840 while (remain_len >= 2) {
841 if (first_list_value == FALSE) {
842 ND_PRINT(",");
843 }
844 first_list_value = FALSE;
845 subopt_len = GET_BE_U_2(tp);
846 if (subopt_len > remain_len - 2) {
847 ND_PRINT(" ?");
848 break;
849 }
850 tp += 2;
851 nd_printjn(ndo, tp, subopt_len);
852 tp += subopt_len;
853 remain_len -= (subopt_len + 2);
854 }
855 if (remain_len != 0)
856 ND_PRINT(" ?");
857 ND_PRINT(")");
858 break;
859
860 case DH6OPT_VENDOR_CLASS:
861 /* RFC 8415 section 21.16 */
862 if (optlen < 4) {
863 ND_PRINT(" ?)");
864 break;
865 }
866 tp = (const u_char *)(dh6o + 1);
867 remain_len = optlen;
868 ND_PRINT(" enterprise %u", GET_BE_U_4(tp));
869 remain_len -= 4;
870 tp += 4;
871 while (remain_len >= 2) {
872 /* there are vendor-class-data */
873 subopt_len = GET_BE_U_2(tp);
874 ND_PRINT(" (len %u", subopt_len);
875 tp += 2;
876 remain_len -= 2;
877 if (subopt_len > remain_len) {
878 ND_PRINT(" ?");
879 break;
880 }
881 if (subopt_len > 0) {
882 ND_PRINT(" data ");
883 nd_printjn(ndo, tp, subopt_len);
884 tp += subopt_len;
885 remain_len -= subopt_len;
886 }
887 ND_PRINT(")");
888 }
889 if (remain_len != 0)
890 ND_PRINT(" ?");
891 ND_PRINT(")");
892 break;
893
894 case DH6OPT_VENDOR_OPTS:
895 /* RFC 8415 section 21.17 */
896 if (optlen < 4) {
897 ND_PRINT(" ?)");
898 break;
899 }
900 tp = (const u_char *)(dh6o + 1);
901 remain_len = optlen;
902 ND_PRINT(" enterprise %u", GET_BE_U_4(tp));
903 remain_len -= 4;
904 tp += 4;
905 while (remain_len >= 4) {
906 /* there are sub-options */
907 ND_PRINT(" (code %u", GET_BE_U_2(tp));
908 tp += 2;
909 subopt_len = GET_BE_U_2(tp);
910 ND_PRINT(" len %u", subopt_len);
911 tp += 2;
912 remain_len -= 4;
913 if (subopt_len > remain_len) {
914 ND_PRINT(" ?");
915 break;
916 }
917 if (subopt_len > 0) {
918 ND_PRINT(" data ");
919 /*
920 * if ndo_vflag < 2, print hex dump up
921 * to 10 characters.
922 */
923 if (ndo->ndo_vflag < 2)
924 max_char = ND_MIN(subopt_len, 10);
925 else
926 max_char = subopt_len;
927 for (i = 0; i < max_char; i++)
928 ND_PRINT("%02x",
929 GET_U_1(tp + i));
930 if (i < subopt_len)
931 ND_PRINT("...");
932 tp += subopt_len;
933 remain_len -= subopt_len;
934 }
935 ND_PRINT(")");
936 }
937 if (remain_len != 0)
938 ND_PRINT(" ?");
939 ND_PRINT(")");
940 break;
941
942 default:
943 ND_PRINT(")");
944 break;
945 }
946
947 cp += sizeof(*dh6o) + optlen;
948 }
949 return;
950
951 trunc:
952 nd_print_trunc(ndo);
953 }
954
955 /*
956 * Print dhcp6 packets
957 */
958 void
959 dhcp6_print(netdissect_options *ndo,
960 const u_char *cp, u_int length)
961 {
962 const struct dhcp6 *dh6;
963 const struct dhcp6_relay *dh6relay;
964 uint8_t msgtype;
965 const u_char *ep;
966 const u_char *extp;
967 const char *name;
968
969 ndo->ndo_protocol = "dhcp6";
970 nd_print_protocol(ndo);
971
972 ep = ndo->ndo_snapend;
973 if (cp + length < ep)
974 ep = cp + length;
975
976 dh6 = (const struct dhcp6 *)cp;
977 dh6relay = (const struct dhcp6_relay *)cp;
978 ND_TCHECK_4(dh6->dh6_msgtypexid.xid);
979 msgtype = GET_U_1(dh6->dh6_msgtypexid.msgtype);
980 name = tok2str(dh6_msgtype_str, "msgtype-%u", msgtype);
981
982 if (!ndo->ndo_vflag) {
983 ND_PRINT(" %s", name);
984 return;
985 }
986
987 /* XXX relay agent messages have to be handled differently */
988
989 ND_PRINT(" %s (", name); /*)*/
990 if (msgtype != DH6_RELAY_FORW && msgtype != DH6_RELAY_REPLY) {
991 ND_PRINT("xid=%x",
992 GET_BE_U_4(dh6->dh6_msgtypexid.xid) & DH6_XIDMASK);
993 extp = (const u_char *)(dh6 + 1);
994 dhcp6opt_print(ndo, extp, ep);
995 } else { /* relay messages */
996 ND_PRINT("linkaddr=%s", GET_IP6ADDR_STRING(dh6relay->dh6relay_linkaddr));
997
998 ND_PRINT(" peeraddr=%s", GET_IP6ADDR_STRING(dh6relay->dh6relay_peeraddr));
999
1000 dhcp6opt_print(ndo, (const u_char *)(dh6relay + 1), ep);
1001 }
1002 /*(*/
1003 ND_PRINT(")");
1004 return;
1005
1006 trunc:
1007 nd_print_trunc(ndo);
1008 }
[mirror] the TCPdump network dissector