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Babel,DHCPv6: Use nd_print_protocol()
[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_BOOTFILE_URL 59 /* RFC5970 */
192 #define DH6OPT_AFTR_NAME 64
193 #define DH6OPT_MUDURL 112
194 #define DH6OPT_SZTP_REDIRECT 136 /* RFC8572 */
195
196 static const struct tok dh6opt_str[] = {
197 { DH6OPT_CLIENTID, "client-ID" },
198 { DH6OPT_SERVERID, "server-ID" },
199 { DH6OPT_IA_NA, "IA_NA" },
200 { DH6OPT_IA_TA, "IA_TA" },
201 { DH6OPT_IA_ADDR, "IA_ADDR" },
202 { DH6OPT_ORO, "option-request" },
203 { DH6OPT_PREFERENCE, "preference" },
204 { DH6OPT_ELAPSED_TIME, "elapsed-time" },
205 { DH6OPT_RELAY_MSG, "relay-message" },
206 { DH6OPT_AUTH, "authentication" },
207 { DH6OPT_UNICAST, "server-unicast" },
208 { DH6OPT_STATUS_CODE, "status-code" },
209 { DH6OPT_RAPID_COMMIT, "rapid-commit" },
210 { DH6OPT_USER_CLASS, "user-class" },
211 { DH6OPT_VENDOR_CLASS, "vendor-class" },
212 { DH6OPT_VENDOR_OPTS, "vendor-specific-info" },
213 { DH6OPT_INTERFACE_ID, "interface-ID" },
214 { DH6OPT_RECONF_MSG, "reconfigure-message" },
215 { DH6OPT_RECONF_ACCEPT, "reconfigure-accept" },
216 { DH6OPT_SIP_SERVER_D, "SIP-servers-domain" },
217 { DH6OPT_SIP_SERVER_A, "SIP-servers-address" },
218 { DH6OPT_DNS_SERVERS, "DNS-server" },
219 { DH6OPT_DOMAIN_LIST, "DNS-search-list" },
220 { DH6OPT_IA_PD, "IA_PD" },
221 { DH6OPT_IA_PD_PREFIX, "IA_PD-prefix" },
222 { DH6OPT_SNTP_SERVERS, "SNTP-servers" },
223 { DH6OPT_LIFETIME, "lifetime" },
224 { DH6OPT_NIS_SERVERS, "NIS-server" },
225 { DH6OPT_NISP_SERVERS, "NIS+-server" },
226 { DH6OPT_NIS_NAME, "NIS-domain-name" },
227 { DH6OPT_NISP_NAME, "NIS+-domain-name" },
228 { DH6OPT_BCMCS_SERVER_D, "BCMCS-domain-name" },
229 { DH6OPT_BCMCS_SERVER_A, "BCMCS-server" },
230 { DH6OPT_GEOCONF_CIVIC, "Geoconf-Civic" },
231 { DH6OPT_REMOTE_ID, "Remote-ID" },
232 { DH6OPT_SUBSCRIBER_ID, "Subscriber-ID" },
233 { DH6OPT_CLIENT_FQDN, "Client-FQDN" },
234 { DH6OPT_PANA_AGENT, "PANA-agent" },
235 { DH6OPT_NEW_POSIX_TIMEZONE, "POSIX-timezone" },
236 { DH6OPT_NEW_TZDB_TIMEZONE, "POSIX-tz-database" },
237 { DH6OPT_ERO, "Echo-request-option" },
238 { DH6OPT_LQ_QUERY, "Lease-query" },
239 { DH6OPT_CLIENT_DATA, "LQ-client-data" },
240 { DH6OPT_CLT_TIME, "Clt-time" },
241 { DH6OPT_LQ_RELAY_DATA, "LQ-relay-data" },
242 { DH6OPT_LQ_CLIENT_LINK, "LQ-client-link" },
243 { DH6OPT_NTP_SERVER, "NTP-server" },
244 { DH6OPT_BOOTFILE_URL, "Bootfile-URL" },
245 { DH6OPT_AFTR_NAME, "AFTR-Name" },
246 { DH6OPT_MUDURL, "MUD-URL" },
247 { DH6OPT_SZTP_REDIRECT, "SZTP-redirect" },
248 { 0, NULL }
249 };
250
251 static const struct tok dh6opt_stcode_str[] = {
252 { DH6OPT_STCODE_SUCCESS, "Success" }, /* RFC3315 */
253 { DH6OPT_STCODE_UNSPECFAIL, "UnspecFail" }, /* RFC3315 */
254 { DH6OPT_STCODE_NOADDRAVAIL, "NoAddrsAvail" }, /* RFC3315 */
255 { DH6OPT_STCODE_NOBINDING, "NoBinding" }, /* RFC3315 */
256 { DH6OPT_STCODE_NOTONLINK, "NotOnLink" }, /* RFC3315 */
257 { DH6OPT_STCODE_USEMULTICAST, "UseMulticast" }, /* RFC3315 */
258 { DH6OPT_STCODE_NOPREFIXAVAIL, "NoPrefixAvail" }, /* RFC3633 */
259 { DH6OPT_STCODE_UNKNOWNQUERYTYPE, "UnknownQueryType" }, /* RFC5007 */
260 { DH6OPT_STCODE_MALFORMEDQUERY, "MalformedQuery" }, /* RFC5007 */
261 { DH6OPT_STCODE_NOTCONFIGURED, "NotConfigured" }, /* RFC5007 */
262 { DH6OPT_STCODE_NOTALLOWED, "NotAllowed" }, /* RFC5007 */
263 { 0, NULL }
264 };
265
266 struct dhcp6opt {
267 nd_uint16_t dh6opt_type;
268 nd_uint16_t dh6opt_len;
269 /* type-dependent data follows */
270 };
271
272 static const char *
273 dhcp6stcode(const uint16_t code)
274 {
275 return code > 255 ? "INVALID code" : tok2str(dh6opt_stcode_str, "code%u", code);
276 }
277
278 static void
279 dhcp6opt_print(netdissect_options *ndo,
280 const u_char *cp, const u_char *ep)
281 {
282 const struct dhcp6opt *dh6o;
283 const u_char *tp;
284 u_int i;
285 uint16_t opttype;
286 uint16_t optlen;
287 uint8_t auth_proto;
288 uint8_t auth_alg;
289 uint8_t auth_rdm;
290 u_int authinfolen, authrealmlen;
291 u_int remain_len; /* Length of remaining options */
292 u_int label_len; /* Label length */
293 uint16_t subopt_code;
294 uint16_t subopt_len;
295 uint8_t dh6_reconf_type;
296 uint8_t dh6_lq_query_type;
297 u_int first_list_value;
298 uint16_t remainder_len;
299
300 if (cp == ep)
301 return;
302 while (cp < ep) {
303 if (ep < cp + sizeof(*dh6o))
304 goto trunc;
305 dh6o = (const struct dhcp6opt *)cp;
306 ND_TCHECK_SIZE(dh6o);
307 optlen = GET_BE_U_2(dh6o->dh6opt_len);
308 if (ep < cp + sizeof(*dh6o) + optlen)
309 goto trunc;
310 opttype = GET_BE_U_2(dh6o->dh6opt_type);
311 ND_PRINT(" (%s", tok2str(dh6opt_str, "opt_%u", opttype));
312 ND_TCHECK_LEN(cp + sizeof(*dh6o), optlen);
313 switch (opttype) {
314 case DH6OPT_CLIENTID:
315 case DH6OPT_SERVERID:
316 if (optlen < 2) {
317 /*(*/
318 ND_PRINT(" ?)");
319 break;
320 }
321 tp = (const u_char *)(dh6o + 1);
322 switch (GET_BE_U_2(tp)) {
323 case 1:
324 if (optlen >= 2 + 6) {
325 ND_PRINT(" hwaddr/time type %u time %u ",
326 GET_BE_U_2(tp + 2),
327 GET_BE_U_4(tp + 4));
328 for (i = 8; i < optlen; i++)
329 ND_PRINT("%02x",
330 GET_U_1(tp + i));
331 /*(*/
332 ND_PRINT(")");
333 } else {
334 /*(*/
335 ND_PRINT(" ?)");
336 }
337 break;
338 case 2:
339 if (optlen >= 2 + 8) {
340 ND_PRINT(" vid ");
341 for (i = 2; i < 2 + 8; i++)
342 ND_PRINT("%02x",
343 GET_U_1(tp + i));
344 /*(*/
345 ND_PRINT(")");
346 } else {
347 /*(*/
348 ND_PRINT(" ?)");
349 }
350 break;
351 case 3:
352 if (optlen >= 2 + 2) {
353 ND_PRINT(" hwaddr type %u ",
354 GET_BE_U_2(tp + 2));
355 for (i = 4; i < optlen; i++)
356 ND_PRINT("%02x",
357 GET_U_1(tp + i));
358 /*(*/
359 ND_PRINT(")");
360 } else {
361 /*(*/
362 ND_PRINT(" ?)");
363 }
364 break;
365 default:
366 ND_PRINT(" type %u)", GET_BE_U_2(tp));
367 break;
368 }
369 break;
370 case DH6OPT_IA_ADDR:
371 if (optlen < 24) {
372 /*(*/
373 ND_PRINT(" ?)");
374 break;
375 }
376 tp = (const u_char *)(dh6o + 1);
377 ND_PRINT(" %s", GET_IP6ADDR_STRING(tp));
378 ND_PRINT(" pltime:%u vltime:%u",
379 GET_BE_U_4(tp + 16),
380 GET_BE_U_4(tp + 20));
381 if (optlen > 24) {
382 /* there are sub-options */
383 dhcp6opt_print(ndo, tp + 24, tp + optlen);
384 }
385 ND_PRINT(")");
386 break;
387 case DH6OPT_ORO:
388 case DH6OPT_ERO:
389 if (optlen % 2) {
390 ND_PRINT(" ?)");
391 break;
392 }
393 tp = (const u_char *)(dh6o + 1);
394 for (i = 0; i < optlen; i += 2) {
395 ND_PRINT(" %s",
396 tok2str(dh6opt_str, "opt_%u", GET_BE_U_2(tp + i)));
397 }
398 ND_PRINT(")");
399 break;
400 case DH6OPT_PREFERENCE:
401 if (optlen != 1) {
402 ND_PRINT(" ?)");
403 break;
404 }
405 tp = (const u_char *)(dh6o + 1);
406 ND_PRINT(" %u)", GET_U_1(tp));
407 break;
408 case DH6OPT_ELAPSED_TIME:
409 if (optlen != 2) {
410 ND_PRINT(" ?)");
411 break;
412 }
413 tp = (const u_char *)(dh6o + 1);
414 ND_PRINT(" %u)", GET_BE_U_2(tp));
415 break;
416 case DH6OPT_RELAY_MSG:
417 {
418 const u_char *snapend_save;
419
420 ND_PRINT(" (");
421 tp = (const u_char *)(dh6o + 1);
422 /*
423 * Update the snapend to the end of the option before
424 * calling recursively dhcp6_print() for the nested
425 * packet. Other options may be present after the
426 * nested DHCPv6 packet. This prevents that, in
427 * dhcp6_print(), for the nested DHCPv6 packet, the
428 * remaining length < remaining caplen.
429 */
430 snapend_save = ndo->ndo_snapend;
431 ndo->ndo_snapend = ND_MIN(tp + optlen, ndo->ndo_snapend);
432 dhcp6_print(ndo, tp, optlen);
433 ndo->ndo_snapend = snapend_save;
434 ND_PRINT(")");
435 break;
436 }
437 case DH6OPT_AUTH:
438 if (optlen < 11) {
439 ND_PRINT(" ?)");
440 break;
441 }
442 tp = (const u_char *)(dh6o + 1);
443 auth_proto = GET_U_1(tp);
444 switch (auth_proto) {
445 case DH6OPT_AUTHPROTO_DELAYED:
446 ND_PRINT(" proto: delayed");
447 break;
448 case DH6OPT_AUTHPROTO_RECONFIG:
449 ND_PRINT(" proto: reconfigure");
450 break;
451 default:
452 ND_PRINT(" proto: %u", auth_proto);
453 break;
454 }
455 tp++;
456 auth_alg = GET_U_1(tp);
457 switch (auth_alg) {
458 case DH6OPT_AUTHALG_HMACMD5:
459 /* XXX: may depend on the protocol */
460 ND_PRINT(", alg: HMAC-MD5");
461 break;
462 default:
463 ND_PRINT(", alg: %u", auth_alg);
464 break;
465 }
466 tp++;
467 auth_rdm = GET_U_1(tp);
468 switch (auth_rdm) {
469 case DH6OPT_AUTHRDM_MONOCOUNTER:
470 ND_PRINT(", RDM: mono");
471 break;
472 default:
473 ND_PRINT(", RDM: %u", auth_rdm);
474 break;
475 }
476 tp++;
477 ND_PRINT(", RD:");
478 for (i = 0; i < 4; i++, tp += 2)
479 ND_PRINT(" %04x", GET_BE_U_2(tp));
480
481 /* protocol dependent part */
482 authinfolen = optlen - 11;
483 switch (auth_proto) {
484 case DH6OPT_AUTHPROTO_DELAYED:
485 if (authinfolen == 0)
486 break;
487 if (authinfolen < 20) {
488 ND_PRINT(" ??");
489 break;
490 }
491 authrealmlen = authinfolen - 20;
492 if (authrealmlen > 0) {
493 ND_PRINT(", realm: ");
494 }
495 for (i = 0; i < authrealmlen; i++, tp++)
496 ND_PRINT("%02x", GET_U_1(tp));
497 ND_PRINT(", key ID: %08x", GET_BE_U_4(tp));
498 tp += 4;
499 ND_PRINT(", HMAC-MD5:");
500 for (i = 0; i < 4; i++, tp+= 4)
501 ND_PRINT(" %08x", GET_BE_U_4(tp));
502 break;
503 case DH6OPT_AUTHPROTO_RECONFIG:
504 if (authinfolen != 17) {
505 ND_PRINT(" ??");
506 break;
507 }
508 switch (GET_U_1(tp)) {
509 case DH6OPT_AUTHRECONFIG_KEY:
510 ND_PRINT(" reconfig-key");
511 break;
512 case DH6OPT_AUTHRECONFIG_HMACMD5:
513 ND_PRINT(" type: HMAC-MD5");
514 break;
515 default:
516 ND_PRINT(" type: ??");
517 break;
518 }
519 tp++;
520 ND_PRINT(" value:");
521 for (i = 0; i < 4; i++, tp+= 4)
522 ND_PRINT(" %08x", GET_BE_U_4(tp));
523 break;
524 default:
525 ND_PRINT(" ??");
526 break;
527 }
528
529 ND_PRINT(")");
530 break;
531 case DH6OPT_RAPID_COMMIT: /* nothing todo */
532 ND_PRINT(")");
533 break;
534 case DH6OPT_INTERFACE_ID:
535 case DH6OPT_SUBSCRIBER_ID:
536 /*
537 * Since we cannot predict the encoding, print hex dump
538 * at most 10 characters.
539 */
540 tp = (const u_char *)(dh6o + 1);
541 ND_PRINT(" ");
542 for (i = 0; i < optlen && i < 10; i++)
543 ND_PRINT("%02x", GET_U_1(tp + i));
544 ND_PRINT("...)");
545 break;
546 case DH6OPT_RECONF_MSG:
547 if (optlen != 1) {
548 ND_PRINT(" ?)");
549 break;
550 }
551 tp = (const u_char *)(dh6o + 1);
552 dh6_reconf_type = GET_U_1(tp);
553 switch (dh6_reconf_type) {
554 case DH6_RENEW:
555 ND_PRINT(" for renew)");
556 break;
557 case DH6_INFORM_REQ:
558 ND_PRINT(" for inf-req)");
559 break;
560 default:
561 ND_PRINT(" for ?\?\?(%02x))", dh6_reconf_type);
562 break;
563 }
564 break;
565 case DH6OPT_RECONF_ACCEPT: /* nothing todo */
566 ND_PRINT(")");
567 break;
568 case DH6OPT_SIP_SERVER_A:
569 case DH6OPT_DNS_SERVERS:
570 case DH6OPT_SNTP_SERVERS:
571 case DH6OPT_NIS_SERVERS:
572 case DH6OPT_NISP_SERVERS:
573 case DH6OPT_BCMCS_SERVER_A:
574 case DH6OPT_PANA_AGENT:
575 case DH6OPT_LQ_CLIENT_LINK:
576 if (optlen % 16) {
577 ND_PRINT(" ?)");
578 break;
579 }
580 tp = (const u_char *)(dh6o + 1);
581 for (i = 0; i < optlen; i += 16)
582 ND_PRINT(" %s", GET_IP6ADDR_STRING(tp + i));
583 ND_PRINT(")");
584 break;
585 case DH6OPT_SIP_SERVER_D:
586 case DH6OPT_DOMAIN_LIST:
587 tp = (const u_char *)(dh6o + 1);
588 while (tp < cp + sizeof(*dh6o) + optlen) {
589 ND_PRINT(" ");
590 if ((tp = fqdn_print(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL)
591 goto trunc;
592 }
593 ND_PRINT(")");
594 break;
595 case DH6OPT_STATUS_CODE:
596 if (optlen < 2) {
597 ND_PRINT(" ?)");
598 break;
599 }
600 tp = (const u_char *)(dh6o + 1);
601 ND_PRINT(" %s)", dhcp6stcode(GET_BE_U_2(tp)));
602 break;
603 case DH6OPT_IA_NA:
604 case DH6OPT_IA_PD:
605 if (optlen < 12) {
606 ND_PRINT(" ?)");
607 break;
608 }
609 tp = (const u_char *)(dh6o + 1);
610 ND_PRINT(" IAID:%u T1:%u T2:%u",
611 GET_BE_U_4(tp),
612 GET_BE_U_4(tp + 4),
613 GET_BE_U_4(tp + 8));
614 if (optlen > 12) {
615 /* there are sub-options */
616 dhcp6opt_print(ndo, tp + 12, tp + optlen);
617 }
618 ND_PRINT(")");
619 break;
620 case DH6OPT_IA_TA:
621 if (optlen < 4) {
622 ND_PRINT(" ?)");
623 break;
624 }
625 tp = (const u_char *)(dh6o + 1);
626 ND_PRINT(" IAID:%u", GET_BE_U_4(tp));
627 if (optlen > 4) {
628 /* there are sub-options */
629 dhcp6opt_print(ndo, tp + 4, tp + optlen);
630 }
631 ND_PRINT(")");
632 break;
633 case DH6OPT_IA_PD_PREFIX:
634 if (optlen < 25) {
635 ND_PRINT(" ?)");
636 break;
637 }
638 tp = (const u_char *)(dh6o + 1);
639 ND_PRINT(" %s/%u", GET_IP6ADDR_STRING(tp + 9),
640 GET_U_1(tp + 8));
641 ND_PRINT(" pltime:%u vltime:%u",
642 GET_BE_U_4(tp),
643 GET_BE_U_4(tp + 4));
644 if (optlen > 25) {
645 /* there are sub-options */
646 dhcp6opt_print(ndo, tp + 25, tp + optlen);
647 }
648 ND_PRINT(")");
649 break;
650 case DH6OPT_LIFETIME:
651 case DH6OPT_CLT_TIME:
652 if (optlen != 4) {
653 ND_PRINT(" ?)");
654 break;
655 }
656 tp = (const u_char *)(dh6o + 1);
657 ND_PRINT(" %u)", GET_BE_U_4(tp));
658 break;
659 case DH6OPT_REMOTE_ID:
660 if (optlen < 4) {
661 ND_PRINT(" ?)");
662 break;
663 }
664 tp = (const u_char *)(dh6o + 1);
665 ND_PRINT(" %u ", GET_BE_U_4(tp));
666 /*
667 * Print hex dump first 10 characters.
668 */
669 for (i = 4; i < optlen && i < 14; i++)
670 ND_PRINT("%02x", GET_U_1(tp + i));
671 ND_PRINT("...)");
672 break;
673 case DH6OPT_LQ_QUERY:
674 if (optlen < 17) {
675 ND_PRINT(" ?)");
676 break;
677 }
678 tp = (const u_char *)(dh6o + 1);
679 dh6_lq_query_type = GET_U_1(tp);
680 switch (dh6_lq_query_type) {
681 case 1:
682 ND_PRINT(" by-address");
683 break;
684 case 2:
685 ND_PRINT(" by-clientID");
686 break;
687 default:
688 ND_PRINT(" type_%u", dh6_lq_query_type);
689 break;
690 }
691 ND_PRINT(" %s", GET_IP6ADDR_STRING(tp + 1));
692 if (optlen > 17) {
693 /* there are query-options */
694 dhcp6opt_print(ndo, tp + 17, tp + optlen);
695 }
696 ND_PRINT(")");
697 break;
698 case DH6OPT_CLIENT_DATA:
699 tp = (const u_char *)(dh6o + 1);
700 if (optlen > 0) {
701 /* there are encapsulated options */
702 dhcp6opt_print(ndo, tp, tp + optlen);
703 }
704 ND_PRINT(")");
705 break;
706 case DH6OPT_LQ_RELAY_DATA:
707 if (optlen < 16) {
708 ND_PRINT(" ?)");
709 break;
710 }
711 tp = (const u_char *)(dh6o + 1);
712 ND_PRINT(" %s ", GET_IP6ADDR_STRING(tp));
713 /*
714 * Print hex dump first 10 characters.
715 */
716 for (i = 16; i < optlen && i < 26; i++)
717 ND_PRINT("%02x", GET_U_1(tp + i));
718 ND_PRINT("...)");
719 break;
720 case DH6OPT_NTP_SERVER:
721 if (optlen < 4) {
722 ND_PRINT(" ?)");
723 break;
724 }
725 tp = (const u_char *)(dh6o + 1);
726 while (tp < cp + sizeof(*dh6o) + optlen - 4) {
727 subopt_code = GET_BE_U_2(tp);
728 tp += 2;
729 subopt_len = GET_BE_U_2(tp);
730 tp += 2;
731 if (tp + subopt_len > cp + sizeof(*dh6o) + optlen)
732 goto trunc;
733 ND_PRINT(" subopt:%u", subopt_code);
734 switch (subopt_code) {
735 case DH6OPT_NTP_SUBOPTION_SRV_ADDR:
736 case DH6OPT_NTP_SUBOPTION_MC_ADDR:
737 if (subopt_len != 16) {
738 ND_PRINT(" ?");
739 break;
740 }
741 ND_PRINT(" %s", GET_IP6ADDR_STRING(tp));
742 break;
743 case DH6OPT_NTP_SUBOPTION_SRV_FQDN:
744 ND_PRINT(" ");
745 if (fqdn_print(ndo, tp, tp + subopt_len) == NULL)
746 goto trunc;
747 break;
748 default:
749 ND_PRINT(" ?");
750 break;
751 }
752 tp += subopt_len;
753 }
754 ND_PRINT(")");
755 break;
756 case DH6OPT_AFTR_NAME:
757 if (optlen < 3) {
758 ND_PRINT(" ?)");
759 break;
760 }
761 tp = (const u_char *)(dh6o + 1);
762 remain_len = optlen;
763 ND_PRINT(" ");
764 /* Encoding is described in section 3.1 of RFC 1035 */
765 while (remain_len && GET_U_1(tp)) {
766 label_len = GET_U_1(tp);
767 tp++;
768 if (label_len < remain_len - 1) {
769 nd_printjnp(ndo, tp, label_len);
770 tp += label_len;
771 remain_len -= (label_len + 1);
772 if(GET_U_1(tp)) ND_PRINT(".");
773 } else {
774 ND_PRINT(" ?");
775 break;
776 }
777 }
778 ND_PRINT(")");
779 break;
780 case DH6OPT_NEW_POSIX_TIMEZONE: /* all three of these options */
781 case DH6OPT_NEW_TZDB_TIMEZONE: /* are encoded similarly */
782 case DH6OPT_MUDURL: /* although GMT might not work */
783 if (optlen < 5) {
784 ND_PRINT(" ?)");
785 break;
786 }
787 tp = (const u_char *)(dh6o + 1);
788 ND_PRINT(" ");
789 nd_printjnp(ndo, tp, optlen);
790 ND_PRINT(")");
791 break;
792
793 case DH6OPT_BOOTFILE_URL:
794 tp = (const u_char *)(dh6o + 1);
795 ND_PRINT(" ");
796 nd_printjn(ndo, tp, optlen);
797 ND_PRINT(")");
798 break;
799
800 case DH6OPT_SZTP_REDIRECT:
801 case DH6OPT_USER_CLASS:
802 ND_PRINT(" ");
803 tp = (const u_char *)(dh6o + 1);
804 first_list_value = TRUE;
805 remainder_len = optlen;
806 while (remainder_len >= 2) {
807 if (first_list_value == FALSE) {
808 ND_PRINT(",");
809 }
810 first_list_value = FALSE;
811 subopt_len = GET_BE_U_2(tp);
812 if (subopt_len > remainder_len-2) {
813 break;
814 }
815 tp += 2;
816 nd_printjn(ndo, tp, subopt_len);
817 tp += subopt_len;
818 remainder_len -= (subopt_len+2);
819 }
820 if (remainder_len != 0 ) {
821 ND_PRINT(" ?");
822 }
823 ND_PRINT(")");
824 break;
825
826 default:
827 ND_PRINT(")");
828 break;
829 }
830
831 cp += sizeof(*dh6o) + optlen;
832 }
833 return;
834
835 trunc:
836 nd_print_trunc(ndo);
837 }
838
839 /*
840 * Print dhcp6 packets
841 */
842 void
843 dhcp6_print(netdissect_options *ndo,
844 const u_char *cp, u_int length)
845 {
846 const struct dhcp6 *dh6;
847 const struct dhcp6_relay *dh6relay;
848 uint8_t msgtype;
849 const u_char *ep;
850 const u_char *extp;
851 const char *name;
852
853 ndo->ndo_protocol = "dhcp6";
854 nd_print_protocol(ndo);
855
856 ep = ndo->ndo_snapend;
857 if (cp + length < ep)
858 ep = cp + length;
859
860 dh6 = (const struct dhcp6 *)cp;
861 dh6relay = (const struct dhcp6_relay *)cp;
862 ND_TCHECK_4(dh6->dh6_msgtypexid.xid);
863 msgtype = GET_U_1(dh6->dh6_msgtypexid.msgtype);
864 name = tok2str(dh6_msgtype_str, "msgtype-%u", msgtype);
865
866 if (!ndo->ndo_vflag) {
867 ND_PRINT(" %s", name);
868 return;
869 }
870
871 /* XXX relay agent messages have to be handled differently */
872
873 ND_PRINT(" %s (", name); /*)*/
874 if (msgtype != DH6_RELAY_FORW && msgtype != DH6_RELAY_REPLY) {
875 ND_PRINT("xid=%x",
876 GET_BE_U_4(dh6->dh6_msgtypexid.xid) & DH6_XIDMASK);
877 extp = (const u_char *)(dh6 + 1);
878 dhcp6opt_print(ndo, extp, ep);
879 } else { /* relay messages */
880 ND_PRINT("linkaddr=%s", GET_IP6ADDR_STRING(dh6relay->dh6relay_linkaddr));
881
882 ND_PRINT(" peeraddr=%s", GET_IP6ADDR_STRING(dh6relay->dh6relay_peeraddr));
883
884 dhcp6opt_print(ndo, (const u_char *)(dh6relay + 1), ep);
885 }
886 /*(*/
887 ND_PRINT(")");
888 return;
889
890 trunc:
891 nd_print_trunc(ndo);
892 }
[mirror] the TCPdump network dissector