]> The Tcpdump Group git mirrors - tcpdump/blob - print-dhcp6.c
projects / tcpdump / blob
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
Don't cast away constness.
[tcpdump] / print-dhcp6.c
1 /*
2 * Copyright (C) 1998 and 1999 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 /* \summary: IPv6 DHCP printer */
31
32 /*
33 * RFC3315: DHCPv6
34 * supported DHCPv6 options:
35 * RFC3319: Session Initiation Protocol (SIP) Servers options,
36 * RFC3633: IPv6 Prefix options,
37 * RFC3646: DNS Configuration options,
38 * RFC3898: Network Information Service (NIS) Configuration options,
39 * RFC4075: Simple Network Time Protocol (SNTP) Configuration option,
40 * RFC4242: Information Refresh Time option,
41 * RFC4280: Broadcast and Multicast Control Servers options,
42 * RFC5908: Network Time Protocol (NTP) Server Option for DHCPv6
43 * RFC6334: Dual-Stack Lite option,
44 */
45
46 #ifdef HAVE_CONFIG_H
47 #include "config.h"
48 #endif
49
50 #include <netdissect-stdinc.h>
51
52 #include <stdio.h>
53 #include <string.h>
54
55 #include "netdissect.h"
56 #include "addrtoname.h"
57 #include "extract.h"
58
59 /* lease duration */
60 #define DHCP6_DURATION_INFINITE 0xffffffff
61
62 /* Error Values */
63 #define DH6ERR_FAILURE 16
64 #define DH6ERR_AUTHFAIL 17
65 #define DH6ERR_POORLYFORMED 18
66 #define DH6ERR_UNAVAIL 19
67 #define DH6ERR_OPTUNAVAIL 20
68
69 /* Message type */
70 #define DH6_SOLICIT 1
71 #define DH6_ADVERTISE 2
72 #define DH6_REQUEST 3
73 #define DH6_CONFIRM 4
74 #define DH6_RENEW 5
75 #define DH6_REBIND 6
76 #define DH6_REPLY 7
77 #define DH6_RELEASE 8
78 #define DH6_DECLINE 9
79 #define DH6_RECONFIGURE 10
80 #define DH6_INFORM_REQ 11
81 #define DH6_RELAY_FORW 12
82 #define DH6_RELAY_REPLY 13
83 #define DH6_LEASEQUERY 14
84 #define DH6_LQ_REPLY 15
85
86 static const struct tok dh6_msgtype_str[] = {
87 { DH6_SOLICIT, "solicit" },
88 { DH6_ADVERTISE, "advertise" },
89 { DH6_REQUEST, "request" },
90 { DH6_CONFIRM, "confirm" },
91 { DH6_RENEW, "renew" },
92 { DH6_REBIND, "rebind" },
93 { DH6_REPLY, "reply" },
94 { DH6_RELEASE, "release" },
95 { DH6_DECLINE, "decline" },
96 { DH6_RECONFIGURE, "reconfigure" },
97 { DH6_INFORM_REQ, "inf-req" },
98 { DH6_RELAY_FORW, "relay-fwd" },
99 { DH6_RELAY_REPLY, "relay-reply" },
100 { DH6_LEASEQUERY, "leasequery" },
101 { DH6_LQ_REPLY, "leasequery-reply" },
102 { 0, NULL }
103 };
104
105 /* DHCP6 base packet format */
106 struct dhcp6 {
107 union {
108 nd_uint8_t m;
109 nd_uint32_t x;
110 } dh6_msgtypexid;
111 /* options follow */
112 };
113 #define dh6_msgtype dh6_msgtypexid.m
114 #define dh6_xid dh6_msgtypexid.x
115 #define DH6_XIDMASK 0x00ffffff
116
117 /* DHCPv6 relay messages */
118 struct dhcp6_relay {
119 nd_uint8_t dh6relay_msgtype;
120 nd_uint8_t dh6relay_hcnt;
121 nd_uint8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */
122 nd_uint8_t dh6relay_peeraddr[16];
123 /* options follow */
124 };
125
126 /* options */
127 #define DH6OPT_CLIENTID 1
128 #define DH6OPT_SERVERID 2
129 #define DH6OPT_IA_NA 3
130 #define DH6OPT_IA_TA 4
131 #define DH6OPT_IA_ADDR 5
132 #define DH6OPT_ORO 6
133 #define DH6OPT_PREFERENCE 7
134 # define DH6OPT_PREF_MAX 255
135 #define DH6OPT_ELAPSED_TIME 8
136 #define DH6OPT_RELAY_MSG 9
137 /*#define DH6OPT_SERVER_MSG 10 deprecated */
138 #define DH6OPT_AUTH 11
139 # define DH6OPT_AUTHPROTO_DELAYED 2
140 # define DH6OPT_AUTHPROTO_RECONFIG 3
141 # define DH6OPT_AUTHALG_HMACMD5 1
142 # define DH6OPT_AUTHRDM_MONOCOUNTER 0
143 # define DH6OPT_AUTHRECONFIG_KEY 1
144 # define DH6OPT_AUTHRECONFIG_HMACMD5 2
145 #define DH6OPT_UNICAST 12
146 #define DH6OPT_STATUS_CODE 13
147 # define DH6OPT_STCODE_SUCCESS 0
148 # define DH6OPT_STCODE_UNSPECFAIL 1
149 # define DH6OPT_STCODE_NOADDRAVAIL 2
150 # define DH6OPT_STCODE_NOBINDING 3
151 # define DH6OPT_STCODE_NOTONLINK 4
152 # define DH6OPT_STCODE_USEMULTICAST 5
153 # define DH6OPT_STCODE_NOPREFIXAVAIL 6
154 # define DH6OPT_STCODE_UNKNOWNQUERYTYPE 7
155 # define DH6OPT_STCODE_MALFORMEDQUERY 8
156 # define DH6OPT_STCODE_NOTCONFIGURED 9
157 # define DH6OPT_STCODE_NOTALLOWED 10
158 #define DH6OPT_RAPID_COMMIT 14
159 #define DH6OPT_USER_CLASS 15
160 #define DH6OPT_VENDOR_CLASS 16
161 #define DH6OPT_VENDOR_OPTS 17
162 #define DH6OPT_INTERFACE_ID 18
163 #define DH6OPT_RECONF_MSG 19
164 #define DH6OPT_RECONF_ACCEPT 20
165 #define DH6OPT_SIP_SERVER_D 21
166 #define DH6OPT_SIP_SERVER_A 22
167 #define DH6OPT_DNS_SERVERS 23
168 #define DH6OPT_DOMAIN_LIST 24
169 #define DH6OPT_IA_PD 25
170 #define DH6OPT_IA_PD_PREFIX 26
171 #define DH6OPT_NIS_SERVERS 27
172 #define DH6OPT_NISP_SERVERS 28
173 #define DH6OPT_NIS_NAME 29
174 #define DH6OPT_NISP_NAME 30
175 #define DH6OPT_SNTP_SERVERS 31
176 #define DH6OPT_LIFETIME 32
177 #define DH6OPT_BCMCS_SERVER_D 33
178 #define DH6OPT_BCMCS_SERVER_A 34
179 #define DH6OPT_GEOCONF_CIVIC 36
180 #define DH6OPT_REMOTE_ID 37
181 #define DH6OPT_SUBSCRIBER_ID 38
182 #define DH6OPT_CLIENT_FQDN 39
183 #define DH6OPT_PANA_AGENT 40
184 #define DH6OPT_NEW_POSIX_TIMEZONE 41
185 #define DH6OPT_NEW_TZDB_TIMEZONE 42
186 #define DH6OPT_ERO 43
187 #define DH6OPT_LQ_QUERY 44
188 #define DH6OPT_CLIENT_DATA 45
189 #define DH6OPT_CLT_TIME 46
190 #define DH6OPT_LQ_RELAY_DATA 47
191 #define DH6OPT_LQ_CLIENT_LINK 48
192 #define DH6OPT_NTP_SERVER 56
193 # define DH6OPT_NTP_SUBOPTION_SRV_ADDR 1
194 # define DH6OPT_NTP_SUBOPTION_MC_ADDR 2
195 # define DH6OPT_NTP_SUBOPTION_SRV_FQDN 3
196 #define DH6OPT_AFTR_NAME 64
197 #define DH6OPT_MUDURL 112
198
199 static const struct tok dh6opt_str[] = {
200 { DH6OPT_CLIENTID, "client-ID" },
201 { DH6OPT_SERVERID, "server-ID" },
202 { DH6OPT_IA_NA, "IA_NA" },
203 { DH6OPT_IA_TA, "IA_TA" },
204 { DH6OPT_IA_ADDR, "IA_ADDR" },
205 { DH6OPT_ORO, "option-request" },
206 { DH6OPT_PREFERENCE, "preference" },
207 { DH6OPT_ELAPSED_TIME, "elapsed-time" },
208 { DH6OPT_RELAY_MSG, "relay-message" },
209 { DH6OPT_AUTH, "authentication" },
210 { DH6OPT_UNICAST, "server-unicast" },
211 { DH6OPT_STATUS_CODE, "status-code" },
212 { DH6OPT_RAPID_COMMIT, "rapid-commit" },
213 { DH6OPT_USER_CLASS, "user-class" },
214 { DH6OPT_VENDOR_CLASS, "vendor-class" },
215 { DH6OPT_VENDOR_OPTS, "vendor-specific-info" },
216 { DH6OPT_INTERFACE_ID, "interface-ID" },
217 { DH6OPT_RECONF_MSG, "reconfigure-message" },
218 { DH6OPT_RECONF_ACCEPT, "reconfigure-accept" },
219 { DH6OPT_SIP_SERVER_D, "SIP-servers-domain" },
220 { DH6OPT_SIP_SERVER_A, "SIP-servers-address" },
221 { DH6OPT_DNS_SERVERS, "DNS-server" },
222 { DH6OPT_DOMAIN_LIST, "DNS-search-list" },
223 { DH6OPT_IA_PD, "IA_PD" },
224 { DH6OPT_IA_PD_PREFIX, "IA_PD-prefix" },
225 { DH6OPT_SNTP_SERVERS, "SNTP-servers" },
226 { DH6OPT_LIFETIME, "lifetime" },
227 { DH6OPT_NIS_SERVERS, "NIS-server" },
228 { DH6OPT_NISP_SERVERS, "NIS+-server" },
229 { DH6OPT_NIS_NAME, "NIS-domain-name" },
230 { DH6OPT_NISP_NAME, "NIS+-domain-name" },
231 { DH6OPT_BCMCS_SERVER_D, "BCMCS-domain-name" },
232 { DH6OPT_BCMCS_SERVER_A, "BCMCS-server" },
233 { DH6OPT_GEOCONF_CIVIC, "Geoconf-Civic" },
234 { DH6OPT_REMOTE_ID, "Remote-ID" },
235 { DH6OPT_SUBSCRIBER_ID, "Subscriber-ID" },
236 { DH6OPT_CLIENT_FQDN, "Client-FQDN" },
237 { DH6OPT_PANA_AGENT, "PANA-agent" },
238 { DH6OPT_NEW_POSIX_TIMEZONE, "POSIX-timezone" },
239 { DH6OPT_NEW_TZDB_TIMEZONE, "POSIX-tz-database" },
240 { DH6OPT_ERO, "Echo-request-option" },
241 { DH6OPT_LQ_QUERY, "Lease-query" },
242 { DH6OPT_CLIENT_DATA, "LQ-client-data" },
243 { DH6OPT_CLT_TIME, "Clt-time" },
244 { DH6OPT_LQ_RELAY_DATA, "LQ-relay-data" },
245 { DH6OPT_LQ_CLIENT_LINK, "LQ-client-link" },
246 { DH6OPT_NTP_SERVER, "NTP-server" },
247 { DH6OPT_AFTR_NAME, "AFTR-Name" },
248 { DH6OPT_MUDURL, "MUD-URL" },
249 { 0, NULL }
250 };
251
252 static const struct tok dh6opt_stcode_str[] = {
253 { DH6OPT_STCODE_SUCCESS, "Success" }, /* RFC3315 */
254 { DH6OPT_STCODE_UNSPECFAIL, "UnspecFail" }, /* RFC3315 */
255 { DH6OPT_STCODE_NOADDRAVAIL, "NoAddrsAvail" }, /* RFC3315 */
256 { DH6OPT_STCODE_NOBINDING, "NoBinding" }, /* RFC3315 */
257 { DH6OPT_STCODE_NOTONLINK, "NotOnLink" }, /* RFC3315 */
258 { DH6OPT_STCODE_USEMULTICAST, "UseMulticast" }, /* RFC3315 */
259 { DH6OPT_STCODE_NOPREFIXAVAIL, "NoPrefixAvail" }, /* RFC3633 */
260 { DH6OPT_STCODE_UNKNOWNQUERYTYPE, "UnknownQueryType" }, /* RFC5007 */
261 { DH6OPT_STCODE_MALFORMEDQUERY, "MalformedQuery" }, /* RFC5007 */
262 { DH6OPT_STCODE_NOTCONFIGURED, "NotConfigured" }, /* RFC5007 */
263 { DH6OPT_STCODE_NOTALLOWED, "NotAllowed" }, /* RFC5007 */
264 { 0, NULL }
265 };
266
267 struct dhcp6opt {
268 nd_uint16_t dh6opt_type;
269 nd_uint16_t dh6opt_len;
270 /* type-dependent data follows */
271 };
272
273 static const char *
274 dhcp6stcode(const uint16_t code)
275 {
276 return code > 255 ? "INVALID code" : tok2str(dh6opt_stcode_str, "code%u", code);
277 }
278
279 static void
280 dhcp6opt_print(netdissect_options *ndo,
281 const u_char *cp, const u_char *ep)
282 {
283 const struct dhcp6opt *dh6o;
284 const u_char *tp;
285 size_t i;
286 uint16_t opttype;
287 size_t optlen;
288 uint8_t auth_proto;
289 u_int authinfolen, authrealmlen;
290 int remain_len; /* Length of remaining options */
291 int label_len; /* Label length */
292 uint16_t subopt_code;
293 uint16_t subopt_len;
294
295 if (cp == ep)
296 return;
297 while (cp < ep) {
298 if (ep < cp + sizeof(*dh6o))
299 goto trunc;
300 dh6o = (const struct dhcp6opt *)cp;
301 ND_TCHECK(*dh6o);
302 optlen = EXTRACT_16BITS(&dh6o->dh6opt_len);
303 if (ep < cp + sizeof(*dh6o) + optlen)
304 goto trunc;
305 opttype = EXTRACT_16BITS(&dh6o->dh6opt_type);
306 ND_PRINT((ndo, " (%s", tok2str(dh6opt_str, "opt_%u", opttype)));
307 switch (opttype) {
308 case DH6OPT_CLIENTID:
309 case DH6OPT_SERVERID:
310 if (optlen < 2) {
311 /*(*/
312 ND_PRINT((ndo, " ?)"));
313 break;
314 }
315 tp = (const u_char *)(dh6o + 1);
316 switch (EXTRACT_16BITS(tp)) {
317 case 1:
318 if (optlen >= 2 + 6) {
319 ND_PRINT((ndo, " hwaddr/time type %u time %u ",
320 EXTRACT_16BITS(&tp[2]),
321 EXTRACT_32BITS(&tp[4])));
322 for (i = 8; i < optlen; i++)
323 ND_PRINT((ndo, "%02x", tp[i]));
324 /*(*/
325 ND_PRINT((ndo, ")"));
326 } else {
327 /*(*/
328 ND_PRINT((ndo, " ?)"));
329 }
330 break;
331 case 2:
332 if (optlen >= 2 + 8) {
333 ND_PRINT((ndo, " vid "));
334 for (i = 2; i < 2 + 8; i++)
335 ND_PRINT((ndo, "%02x", tp[i]));
336 /*(*/
337 ND_PRINT((ndo, ")"));
338 } else {
339 /*(*/
340 ND_PRINT((ndo, " ?)"));
341 }
342 break;
343 case 3:
344 if (optlen >= 2 + 2) {
345 ND_PRINT((ndo, " hwaddr type %u ",
346 EXTRACT_16BITS(&tp[2])));
347 for (i = 4; i < optlen; i++)
348 ND_PRINT((ndo, "%02x", tp[i]));
349 /*(*/
350 ND_PRINT((ndo, ")"));
351 } else {
352 /*(*/
353 ND_PRINT((ndo, " ?)"));
354 }
355 break;
356 default:
357 ND_PRINT((ndo, " type %d)", EXTRACT_16BITS(tp)));
358 break;
359 }
360 break;
361 case DH6OPT_IA_ADDR:
362 if (optlen < 24) {
363 /*(*/
364 ND_PRINT((ndo, " ?)"));
365 break;
366 }
367 tp = (const u_char *)(dh6o + 1);
368 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0])));
369 ND_PRINT((ndo, " pltime:%u vltime:%u",
370 EXTRACT_32BITS(&tp[16]),
371 EXTRACT_32BITS(&tp[20])));
372 if (optlen > 24) {
373 /* there are sub-options */
374 dhcp6opt_print(ndo, tp + 24, tp + optlen);
375 }
376 ND_PRINT((ndo, ")"));
377 break;
378 case DH6OPT_ORO:
379 case DH6OPT_ERO:
380 if (optlen % 2) {
381 ND_PRINT((ndo, " ?)"));
382 break;
383 }
384 tp = (const u_char *)(dh6o + 1);
385 for (i = 0; i < optlen; i += 2) {
386 ND_PRINT((ndo, " %s",
387 tok2str(dh6opt_str, "opt_%u", EXTRACT_16BITS(&tp[i]))));
388 }
389 ND_PRINT((ndo, ")"));
390 break;
391 case DH6OPT_PREFERENCE:
392 if (optlen != 1) {
393 ND_PRINT((ndo, " ?)"));
394 break;
395 }
396 tp = (const u_char *)(dh6o + 1);
397 ND_PRINT((ndo, " %d)", *tp));
398 break;
399 case DH6OPT_ELAPSED_TIME:
400 if (optlen != 2) {
401 ND_PRINT((ndo, " ?)"));
402 break;
403 }
404 tp = (const u_char *)(dh6o + 1);
405 ND_PRINT((ndo, " %d)", EXTRACT_16BITS(tp)));
406 break;
407 case DH6OPT_RELAY_MSG:
408 ND_PRINT((ndo, " ("));
409 tp = (const u_char *)(dh6o + 1);
410 dhcp6_print(ndo, tp, optlen);
411 ND_PRINT((ndo, ")"));
412 break;
413 case DH6OPT_AUTH:
414 if (optlen < 11) {
415 ND_PRINT((ndo, " ?)"));
416 break;
417 }
418 tp = (const u_char *)(dh6o + 1);
419 auth_proto = *tp;
420 switch (auth_proto) {
421 case DH6OPT_AUTHPROTO_DELAYED:
422 ND_PRINT((ndo, " proto: delayed"));
423 break;
424 case DH6OPT_AUTHPROTO_RECONFIG:
425 ND_PRINT((ndo, " proto: reconfigure"));
426 break;
427 default:
428 ND_PRINT((ndo, " proto: %d", auth_proto));
429 break;
430 }
431 tp++;
432 switch (*tp) {
433 case DH6OPT_AUTHALG_HMACMD5:
434 /* XXX: may depend on the protocol */
435 ND_PRINT((ndo, ", alg: HMAC-MD5"));
436 break;
437 default:
438 ND_PRINT((ndo, ", alg: %d", *tp));
439 break;
440 }
441 tp++;
442 switch (*tp) {
443 case DH6OPT_AUTHRDM_MONOCOUNTER:
444 ND_PRINT((ndo, ", RDM: mono"));
445 break;
446 default:
447 ND_PRINT((ndo, ", RDM: %d", *tp));
448 break;
449 }
450 tp++;
451 ND_PRINT((ndo, ", RD:"));
452 for (i = 0; i < 4; i++, tp += 2)
453 ND_PRINT((ndo, " %04x", EXTRACT_16BITS(tp)));
454
455 /* protocol dependent part */
456 authinfolen = optlen - 11;
457 switch (auth_proto) {
458 case DH6OPT_AUTHPROTO_DELAYED:
459 if (authinfolen == 0)
460 break;
461 if (authinfolen < 20) {
462 ND_PRINT((ndo, " ??"));
463 break;
464 }
465 authrealmlen = authinfolen - 20;
466 if (authrealmlen > 0) {
467 ND_PRINT((ndo, ", realm: "));
468 }
469 for (i = 0; i < authrealmlen; i++, tp++)
470 ND_PRINT((ndo, "%02x", *tp));
471 ND_PRINT((ndo, ", key ID: %08x", EXTRACT_32BITS(tp)));
472 tp += 4;
473 ND_PRINT((ndo, ", HMAC-MD5:"));
474 for (i = 0; i < 4; i++, tp+= 4)
475 ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tp)));
476 break;
477 case DH6OPT_AUTHPROTO_RECONFIG:
478 if (authinfolen != 17) {
479 ND_PRINT((ndo, " ??"));
480 break;
481 }
482 switch (*tp++) {
483 case DH6OPT_AUTHRECONFIG_KEY:
484 ND_PRINT((ndo, " reconfig-key"));
485 break;
486 case DH6OPT_AUTHRECONFIG_HMACMD5:
487 ND_PRINT((ndo, " type: HMAC-MD5"));
488 break;
489 default:
490 ND_PRINT((ndo, " type: ??"));
491 break;
492 }
493 ND_PRINT((ndo, " value:"));
494 for (i = 0; i < 4; i++, tp+= 4)
495 ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tp)));
496 break;
497 default:
498 ND_PRINT((ndo, " ??"));
499 break;
500 }
501
502 ND_PRINT((ndo, ")"));
503 break;
504 case DH6OPT_RAPID_COMMIT: /* nothing todo */
505 ND_PRINT((ndo, ")"));
506 break;
507 case DH6OPT_INTERFACE_ID:
508 case DH6OPT_SUBSCRIBER_ID:
509 /*
510 * Since we cannot predict the encoding, print hex dump
511 * at most 10 characters.
512 */
513 tp = (const u_char *)(dh6o + 1);
514 ND_PRINT((ndo, " "));
515 for (i = 0; i < optlen && i < 10; i++)
516 ND_PRINT((ndo, "%02x", tp[i]));
517 ND_PRINT((ndo, "...)"));
518 break;
519 case DH6OPT_RECONF_MSG:
520 tp = (const u_char *)(dh6o + 1);
521 switch (*tp) {
522 case DH6_RENEW:
523 ND_PRINT((ndo, " for renew)"));
524 break;
525 case DH6_INFORM_REQ:
526 ND_PRINT((ndo, " for inf-req)"));
527 break;
528 default:
529 ND_PRINT((ndo, " for ?\?\?(%02x))", *tp));
530 break;
531 }
532 break;
533 case DH6OPT_RECONF_ACCEPT: /* nothing todo */
534 ND_PRINT((ndo, ")"));
535 break;
536 case DH6OPT_SIP_SERVER_A:
537 case DH6OPT_DNS_SERVERS:
538 case DH6OPT_SNTP_SERVERS:
539 case DH6OPT_NIS_SERVERS:
540 case DH6OPT_NISP_SERVERS:
541 case DH6OPT_BCMCS_SERVER_A:
542 case DH6OPT_PANA_AGENT:
543 case DH6OPT_LQ_CLIENT_LINK:
544 if (optlen % 16) {
545 ND_PRINT((ndo, " ?)"));
546 break;
547 }
548 tp = (const u_char *)(dh6o + 1);
549 for (i = 0; i < optlen; i += 16)
550 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[i])));
551 ND_PRINT((ndo, ")"));
552 break;
553 case DH6OPT_SIP_SERVER_D:
554 case DH6OPT_DOMAIN_LIST:
555 tp = (const u_char *)(dh6o + 1);
556 while (tp < cp + sizeof(*dh6o) + optlen) {
557 ND_PRINT((ndo, " "));
558 if ((tp = ns_nprint(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL)
559 goto trunc;
560 }
561 ND_PRINT((ndo, ")"));
562 break;
563 case DH6OPT_STATUS_CODE:
564 if (optlen < 2) {
565 ND_PRINT((ndo, " ?)"));
566 break;
567 }
568 tp = (const u_char *)(dh6o + 1);
569 ND_PRINT((ndo, " %s)", dhcp6stcode(EXTRACT_16BITS(&tp[0]))));
570 break;
571 case DH6OPT_IA_NA:
572 case DH6OPT_IA_PD:
573 if (optlen < 12) {
574 ND_PRINT((ndo, " ?)"));
575 break;
576 }
577 tp = (const u_char *)(dh6o + 1);
578 ND_PRINT((ndo, " IAID:%u T1:%u T2:%u",
579 EXTRACT_32BITS(&tp[0]),
580 EXTRACT_32BITS(&tp[4]),
581 EXTRACT_32BITS(&tp[8])));
582 if (optlen > 12) {
583 /* there are sub-options */
584 dhcp6opt_print(ndo, tp + 12, tp + optlen);
585 }
586 ND_PRINT((ndo, ")"));
587 break;
588 case DH6OPT_IA_TA:
589 if (optlen < 4) {
590 ND_PRINT((ndo, " ?)"));
591 break;
592 }
593 tp = (const u_char *)(dh6o + 1);
594 ND_PRINT((ndo, " IAID:%u", EXTRACT_32BITS(tp)));
595 if (optlen > 4) {
596 /* there are sub-options */
597 dhcp6opt_print(ndo, tp + 4, tp + optlen);
598 }
599 ND_PRINT((ndo, ")"));
600 break;
601 case DH6OPT_IA_PD_PREFIX:
602 if (optlen < 25) {
603 ND_PRINT((ndo, " ?)"));
604 break;
605 }
606 tp = (const u_char *)(dh6o + 1);
607 ND_PRINT((ndo, " %s/%d", ip6addr_string(ndo, &tp[9]), tp[8]));
608 ND_PRINT((ndo, " pltime:%u vltime:%u",
609 EXTRACT_32BITS(&tp[0]),
610 EXTRACT_32BITS(&tp[4])));
611 if (optlen > 25) {
612 /* there are sub-options */
613 dhcp6opt_print(ndo, tp + 25, tp + optlen);
614 }
615 ND_PRINT((ndo, ")"));
616 break;
617 case DH6OPT_LIFETIME:
618 case DH6OPT_CLT_TIME:
619 if (optlen != 4) {
620 ND_PRINT((ndo, " ?)"));
621 break;
622 }
623 tp = (const u_char *)(dh6o + 1);
624 ND_PRINT((ndo, " %d)", EXTRACT_32BITS(tp)));
625 break;
626 case DH6OPT_REMOTE_ID:
627 if (optlen < 4) {
628 ND_PRINT((ndo, " ?)"));
629 break;
630 }
631 tp = (const u_char *)(dh6o + 1);
632 ND_PRINT((ndo, " %d ", EXTRACT_32BITS(tp)));
633 /*
634 * Print hex dump first 10 characters.
635 */
636 for (i = 4; i < optlen && i < 14; i++)
637 ND_PRINT((ndo, "%02x", tp[i]));
638 ND_PRINT((ndo, "...)"));
639 break;
640 case DH6OPT_LQ_QUERY:
641 if (optlen < 17) {
642 ND_PRINT((ndo, " ?)"));
643 break;
644 }
645 tp = (const u_char *)(dh6o + 1);
646 switch (*tp) {
647 case 1:
648 ND_PRINT((ndo, " by-address"));
649 break;
650 case 2:
651 ND_PRINT((ndo, " by-clientID"));
652 break;
653 default:
654 ND_PRINT((ndo, " type_%d", (int)*tp));
655 break;
656 }
657 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[1])));
658 if (optlen > 17) {
659 /* there are query-options */
660 dhcp6opt_print(ndo, tp + 17, tp + optlen);
661 }
662 ND_PRINT((ndo, ")"));
663 break;
664 case DH6OPT_CLIENT_DATA:
665 tp = (const u_char *)(dh6o + 1);
666 if (optlen > 0) {
667 /* there are encapsulated options */
668 dhcp6opt_print(ndo, tp, tp + optlen);
669 }
670 ND_PRINT((ndo, ")"));
671 break;
672 case DH6OPT_LQ_RELAY_DATA:
673 if (optlen < 16) {
674 ND_PRINT((ndo, " ?)"));
675 break;
676 }
677 tp = (const u_char *)(dh6o + 1);
678 ND_PRINT((ndo, " %s ", ip6addr_string(ndo, &tp[0])));
679 /*
680 * Print hex dump first 10 characters.
681 */
682 for (i = 16; i < optlen && i < 26; i++)
683 ND_PRINT((ndo, "%02x", tp[i]));
684 ND_PRINT((ndo, "...)"));
685 break;
686 case DH6OPT_NTP_SERVER:
687 if (optlen < 4) {
688 ND_PRINT((ndo, " ?)"));
689 break;
690 }
691 tp = (const u_char *)(dh6o + 1);
692 while (tp < cp + sizeof(*dh6o) + optlen - 4) {
693 subopt_code = EXTRACT_16BITS(tp);
694 tp += 2;
695 subopt_len = EXTRACT_16BITS(tp);
696 tp += 2;
697 if (tp + subopt_len > cp + sizeof(*dh6o) + optlen)
698 goto trunc;
699 ND_PRINT((ndo, " subopt:%d", subopt_code));
700 switch (subopt_code) {
701 case DH6OPT_NTP_SUBOPTION_SRV_ADDR:
702 case DH6OPT_NTP_SUBOPTION_MC_ADDR:
703 if (subopt_len != 16) {
704 ND_PRINT((ndo, " ?"));
705 break;
706 }
707 ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0])));
708 break;
709 case DH6OPT_NTP_SUBOPTION_SRV_FQDN:
710 ND_PRINT((ndo, " "));
711 if (ns_nprint(ndo, tp, tp + subopt_len) == NULL)
712 goto trunc;
713 break;
714 default:
715 ND_PRINT((ndo, " ?"));
716 break;
717 }
718 tp += subopt_len;
719 }
720 ND_PRINT((ndo, ")"));
721 break;
722 case DH6OPT_AFTR_NAME:
723 if (optlen < 3) {
724 ND_PRINT((ndo, " ?)"));
725 break;
726 }
727 tp = (const u_char *)(dh6o + 1);
728 remain_len = optlen;
729 ND_PRINT((ndo, " "));
730 /* Encoding is described in section 3.1 of RFC 1035 */
731 while (remain_len && *tp) {
732 label_len = *tp++;
733 if (label_len < remain_len - 1) {
734 ND_PRINT((ndo, "%.*s", label_len, tp));
735 tp += label_len;
736 remain_len -= (label_len + 1);
737 if(*tp) ND_PRINT((ndo, "."));
738 } else {
739 ND_PRINT((ndo, " ?"));
740 break;
741 }
742 }
743 ND_PRINT((ndo, ")"));
744 break;
745 case DH6OPT_NEW_POSIX_TIMEZONE: /* all three of these options */
746 case DH6OPT_NEW_TZDB_TIMEZONE: /* are encoded similarly */
747 case DH6OPT_MUDURL: /* although GMT might not work */
748 if (optlen < 5) {
749 ND_PRINT((ndo, " ?)"));
750 break;
751 }
752 tp = (const u_char *)(dh6o + 1);
753 ND_PRINT((ndo, "="));
754 fn_printn(ndo, tp, (u_int)optlen, NULL);
755 ND_PRINT((ndo, ")"));
756 break;
757
758 default:
759 ND_PRINT((ndo, ")"));
760 break;
761 }
762
763 cp += sizeof(*dh6o) + optlen;
764 }
765 return;
766
767 trunc:
768 ND_PRINT((ndo, "[|dhcp6ext]"));
769 }
770
771 /*
772 * Print dhcp6 packets
773 */
774 void
775 dhcp6_print(netdissect_options *ndo,
776 const u_char *cp, u_int length)
777 {
778 const struct dhcp6 *dh6;
779 const struct dhcp6_relay *dh6relay;
780 const u_char *ep;
781 const u_char *extp;
782 const char *name;
783
784 ND_PRINT((ndo, "dhcp6"));
785
786 ep = (const u_char *)ndo->ndo_snapend;
787 if (cp + length < ep)
788 ep = cp + length;
789
790 dh6 = (const struct dhcp6 *)cp;
791 dh6relay = (const struct dhcp6_relay *)cp;
792 ND_TCHECK(dh6->dh6_xid);
793 name = tok2str(dh6_msgtype_str, "msgtype-%u", dh6->dh6_msgtype);
794
795 if (!ndo->ndo_vflag) {
796 ND_PRINT((ndo, " %s", name));
797 return;
798 }
799
800 /* XXX relay agent messages have to be handled differently */
801
802 ND_PRINT((ndo, " %s (", name)); /*)*/
803 if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
804 dh6->dh6_msgtype != DH6_RELAY_REPLY) {
805 ND_PRINT((ndo, "xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK));
806 extp = (const u_char *)(dh6 + 1);
807 dhcp6opt_print(ndo, extp, ep);
808 } else { /* relay messages */
809 struct in6_addr addr6;
810
811 ND_TCHECK(dh6relay->dh6relay_peeraddr);
812
813 memcpy(&addr6, dh6relay->dh6relay_linkaddr, sizeof (addr6));
814 ND_PRINT((ndo, "linkaddr=%s", ip6addr_string(ndo, &addr6)));
815
816 memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6));
817 ND_PRINT((ndo, " peeraddr=%s", ip6addr_string(ndo, &addr6)));
818
819 dhcp6opt_print(ndo, (const u_char *)(dh6relay + 1), ep);
820 }
821 /*(*/
822 ND_PRINT((ndo, ")"));
823 return;
824
825 trunc:
826 ND_PRINT((ndo, "[|dhcp6]"));
827 }
[mirror] the TCPdump network dissector