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

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35 * RFC3898,
36 * RFC4075,
37 * RFC4242,
38 * RFC4280,
39 */
40
41#ifndef lint
42static const char rcsid[] _U_ =
43 "@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.36.2.1 2008-02-06 10:26:27 guy Exp $";
44#endif
45
46#ifdef HAVE_CONFIG_H
47#include "config.h"
48#endif
49
50#include <tcpdump-stdinc.h>
51

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172#define DH6OPT_LQ_CLIENT_LINK 48
173
174struct dhcp6opt {
175 u_int16_t dh6opt_type;
176 u_int16_t dh6opt_len;
177 /* type-dependent data follows */
178};
179
180struct dhcp6_ia {
181 u_int16_t dh6opt_ia_type;
182 u_int16_t dh6opt_ia_len;
183 u_int32_t dh6opt_ia_iaid;
184 u_int32_t dh6opt_ia_t1;
185 u_int32_t dh6opt_ia_t2;
186};
187
188struct dhcp6_ia_addr {
189 u_int16_t dh6opt_ia_addr_type;
190 u_int16_t dh6opt_ia_addr_len;
191 struct in6_addr dh6opt_ia_addr_addr;
192 u_int32_t dh6opt_ia_addr_pltime;
193 u_int32_t dh6opt_ia_addr_vltime;
194} __attribute__ ((__packed__));
195
196struct dhcp6_ia_prefix {
197 u_int16_t dh6opt_ia_prefix_type;
198 u_int16_t dh6opt_ia_prefix_len;
199 u_int32_t dh6opt_ia_prefix_pltime;
200 u_int32_t dh6opt_ia_prefix_vltime;
201 u_int8_t dh6opt_ia_prefix_plen;
202 struct in6_addr dh6opt_ia_prefix_addr;
203} __attribute__ ((__packed__));
204
205struct dhcp6_auth {
206 u_int16_t dh6opt_auth_type;
207 u_int16_t dh6opt_auth_len;
208 u_int8_t dh6opt_auth_proto;
209 u_int8_t dh6opt_auth_alg;
210 u_int8_t dh6opt_auth_rdm;
211 u_int8_t dh6opt_auth_rdinfo[8];
212 /* authentication information follows */
213} __attribute__ ((__packed__));
214
215static const char *
216dhcp6opt_name(int type)
217{
218 static char genstr[sizeof("opt_65535") + 1]; /* XXX thread unsafe */
219
220 if (type > 65535)
221 return "INVALID option";
222
223 switch(type) {
224 case DH6OPT_CLIENTID:
225 return "client ID";
226 case DH6OPT_SERVERID:
227 return "server ID";
228 case DH6OPT_IA_NA:
229 return "IA_NA";
230 case DH6OPT_IA_TA:
231 return "IA_TA";
232 case DH6OPT_IA_ADDR:
233 return "IA_ADDR";
234 case DH6OPT_ORO:
235 return "option request";
236 case DH6OPT_PREFERENCE:
237 return "preference";
238 case DH6OPT_ELAPSED_TIME:
239 return "elapsed time";
240 case DH6OPT_RELAY_MSG:
241 return "relay message";
242 case DH6OPT_AUTH:
243 return "authentication";
244 case DH6OPT_UNICAST:
245 return "server unicast";
246 case DH6OPT_STATUS_CODE:
247 return "status code";
248 case DH6OPT_RAPID_COMMIT:
249 return "rapid commit";
250 case DH6OPT_USER_CLASS:
251 return "user class";
252 case DH6OPT_VENDOR_CLASS:
253 return "vendor class";
254 case DH6OPT_VENDOR_OPTS:
255 return "vendor-specific info";
256 case DH6OPT_INTERFACE_ID:
257 return "interface ID";
258 case DH6OPT_RECONF_MSG:
259 return "reconfigure message";
260 case DH6OPT_RECONF_ACCEPT:
261 return "reconfigure accept";
262 case DH6OPT_SIP_SERVER_D:
263 return "SIP servers domain";
264 case DH6OPT_SIP_SERVER_A:
265 return "SIP servers address";
266 case DH6OPT_DNS:
267 return "DNS";
268 case DH6OPT_DNSNAME:
269 return "DNS name";
270 case DH6OPT_IA_PD:
271 return "IA_PD";
272 case DH6OPT_IA_PD_PREFIX:
273 return "IA_PD prefix";
274 case DH6OPT_NTP_SERVERS:
275 return "NTP Server";
276 case DH6OPT_LIFETIME:
277 return "lifetime";
278 case DH6OPT_NIS_SERVERS:
279 return "NIS server";
280 case DH6OPT_NISP_SERVERS:
281 return "NIS+ server";
282 case DH6OPT_NIS_NAME:
283 return "NIS domain name";
284 case DH6OPT_NISP_NAME:
285 return "NIS+ domain name";
286 case DH6OPT_BCMCS_SERVER_D:
287 return "BCMCS domain name";
288 case DH6OPT_BCMCS_SERVER_A:
289 return "BCMCS server";
290 case DH6OPT_GEOCONF_CIVIC:
291 return "Geoconf Civic";
292 case DH6OPT_REMOTE_ID:
293 return "Remote ID";
294 case DH6OPT_SUBSCRIBER_ID:
295 return "Subscriber ID";
296 case DH6OPT_CLIENT_FQDN:
297 return "Client FQDN";
298 case DH6OPT_PANA_AGENT:
299 return "PANA agent";
300 case DH6OPT_NEW_POSIX_TIMEZONE:
301 return "POSIX timezone";
302 case DH6OPT_NEW_TZDB_TIMEZONE:
303 return "POSIX tz database";
304 case DH6OPT_ERO:
305 return "Echo request option";
306 case DH6OPT_LQ_QUERY:
307 return "Lease query";
308 case DH6OPT_CLIENT_DATA:
309 return "LQ client data";
310 case DH6OPT_CLT_TIME:
311 return "Clt time";
312 case DH6OPT_LQ_RELAY_DATA:
313 return "LQ relay data";
314 case DH6OPT_LQ_CLIENT_LINK:
315 return "LQ client link";
316 default:
317 snprintf(genstr, sizeof(genstr), "opt_%d", type);
318 return(genstr);
319 }
320}
321
322static const char *
323dhcp6stcode(int code)

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359static void
360dhcp6opt_print(const u_char *cp, const u_char *ep)
361{
362 struct dhcp6opt *dh6o;
363 u_char *tp;
364 size_t i;
365 u_int16_t opttype;
366 size_t optlen;
367 u_int16_t val16;
368 u_int32_t val32;
369 struct dhcp6_ia ia;
370 struct dhcp6_ia_prefix ia_prefix;
371 struct dhcp6_ia_addr ia_addr;
372 struct dhcp6_auth authopt;
373 u_int authinfolen, authrealmlen;
374
375 if (cp == ep)
376 return;
377 while (cp < ep) {
378 if (ep < cp + sizeof(*dh6o))
379 goto trunc;
380 dh6o = (struct dhcp6opt *)cp;

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433 }
434 break;
435 default:
436 printf(" type %d)", EXTRACT_16BITS(tp));
437 break;
438 }
439 break;
440 case DH6OPT_IA_ADDR:
441 if (optlen < sizeof(ia_addr) - 4) {
442 printf(" ?)");
443 break;
444 }
445 memcpy(&ia_addr, (u_char *)dh6o, sizeof(ia_addr));
446 printf(" %s",
447 ip6addr_string(&ia_addr.dh6opt_ia_addr_addr));
448 ia_addr.dh6opt_ia_addr_pltime =
449 ntohl(ia_addr.dh6opt_ia_addr_pltime);
450 ia_addr.dh6opt_ia_addr_vltime =
451 ntohl(ia_addr.dh6opt_ia_addr_vltime);
452 printf(" pltime:%lu vltime:%lu",
453 (unsigned long)ia_addr.dh6opt_ia_addr_pltime,
454 (unsigned long)ia_addr.dh6opt_ia_addr_vltime);
455 if (optlen > sizeof(ia_addr) - 4) {
456 /* there are sub-options */
457 dhcp6opt_print((u_char *)dh6o +
458 sizeof(ia_addr),
459 (u_char *)(dh6o + 1) + optlen);
460 }
461 printf(")");
462 break;
463 case DH6OPT_ORO:
464 case DH6OPT_ERO:
465 if (optlen % 2) {
466 printf(" ?)");
467 break;
468 }
469 tp = (u_char *)(dh6o + 1);
470 for (i = 0; i < optlen; i += 2) {
471 u_int16_t opt;
472
473 memcpy(&opt, &tp[i], sizeof(opt));
474 printf(" %s", dhcp6opt_name(ntohs(opt)));
475 }
476 printf(")");
477 break;
478 case DH6OPT_PREFERENCE:
479 if (optlen != 1) {
480 printf(" ?)");
481 break;
482 }
483 printf(" %d)", *((u_char *)(dh6o + 1) + 1));
484 break;
485 case DH6OPT_ELAPSED_TIME:
486 if (optlen != 2) {
487 printf(" ?)");
488 break;
489 }
490 memcpy(&val16, dh6o + 1, sizeof(val16));
491 val16 = ntohs(val16);
492 printf(" %d)", (int)val16);
493 break;
494 case DH6OPT_RELAY_MSG:
495 printf(" (");
496 dhcp6_print((const u_char *)(dh6o + 1), optlen);
497 printf(")");
498 break;
499 case DH6OPT_AUTH:
500 if (optlen < sizeof(authopt) - sizeof(*dh6o)) {
501 printf(" ?)");
502 break;
503 }
504 memcpy(&authopt, dh6o, sizeof(authopt));
505 switch (authopt.dh6opt_auth_proto) {
506 case DH6OPT_AUTHPROTO_DELAYED:
507 printf(" proto: delayed");
508 break;
509 case DH6OPT_AUTHPROTO_RECONFIG:
510 printf(" proto: reconfigure");
511 break;
512 default:
513 printf(" proto: %d",
514 authopt.dh6opt_auth_proto);
515 break;
516 }
517 switch (authopt.dh6opt_auth_alg) {
518 case DH6OPT_AUTHALG_HMACMD5:
519 /* XXX: may depend on the protocol */
520 printf(", alg: HMAC-MD5");
521 break;
522 default:
523 printf(", alg: %d", authopt.dh6opt_auth_alg);
524 break;
525 }
526 switch (authopt.dh6opt_auth_rdm) {
527 case DH6OPT_AUTHRDM_MONOCOUNTER:
528 printf(", RDM: mono");
529 break;
530 default:
531 printf(", RDM: %d", authopt.dh6opt_auth_rdm);
532 break;
533 }
534 tp = (u_char *)&authopt.dh6opt_auth_rdinfo;
535 printf(", RD:");
536 for (i = 0; i < 4; i++, tp += sizeof(val16))
537 printf(" %04x", EXTRACT_16BITS(tp));
538
539 /* protocol dependent part */
540 tp = (u_char *)dh6o + sizeof(authopt);
541 authinfolen =
542 optlen + sizeof(*dh6o) - sizeof(authopt);
543 switch (authopt.dh6opt_auth_proto) {
544 case DH6OPT_AUTHPROTO_DELAYED:
545 if (authinfolen == 0)
546 break;
547 if (authinfolen < 20) {
548 printf(" ??");
549 break;
550 }
551 authrealmlen = authinfolen - 20;

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591 printf(")");
592 break;
593 case DH6OPT_INTERFACE_ID:
594 case DH6OPT_SUBSCRIBER_ID:
595 /*
596 * Since we cannot predict the encoding, print hex dump
597 * at most 10 characters.
598 */
599 printf(" ");
600 for (i = 0; i < optlen && i < 10; i++)
601 printf("%02x", ((u_char *)(dh6o + 1))[i]);
602 printf("...)");
603 break;
604 case DH6OPT_RECONF_MSG:
605 tp = (u_char *)(dh6o + 1);
606 switch (*tp) {
607 case DH6_RENEW:
608 printf(" for renew)");
609 break;

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635 printf(" %s", ip6addr_string(&tp[i]));
636 printf(")");
637 break;
638 case DH6OPT_STATUS_CODE:
639 if (optlen < 2) {
640 printf(" ?)");
641 break;
642 }
643 memcpy(&val16, (u_char *)(dh6o + 1), sizeof(val16));
644 val16 = ntohs(val16);
645 printf(" %s)", dhcp6stcode(val16));
646 break;
647 case DH6OPT_IA_NA:
648 case DH6OPT_IA_PD:
649 if (optlen < sizeof(ia) - 4) {
650 printf(" ?)");
651 break;
652 }
653 memcpy(&ia, (u_char *)dh6o, sizeof(ia));
654 ia.dh6opt_ia_iaid = ntohl(ia.dh6opt_ia_iaid);
655 ia.dh6opt_ia_t1 = ntohl(ia.dh6opt_ia_t1);
656 ia.dh6opt_ia_t2 = ntohl(ia.dh6opt_ia_t2);
657 printf(" IAID:%lu T1:%lu T2:%lu",
658 (unsigned long)ia.dh6opt_ia_iaid,
659 (unsigned long)ia.dh6opt_ia_t1,
660 (unsigned long)ia.dh6opt_ia_t2);
661 if (optlen > sizeof(ia) - 4) {
662 /* there are sub-options */
663 dhcp6opt_print((u_char *)dh6o + sizeof(ia),
664 (u_char *)(dh6o + 1) + optlen);
665 }
666 printf(")");
667 break;
668 case DH6OPT_IA_TA:
669 if (optlen < 4) {
670 printf(" ?)");
671 break;
672 }
673 memcpy(&val32, dh6o + 1, sizeof(val32));
674 val32 = ntohl(val32);
675 printf(" IAID:%lu", (unsigned long)val32);
676 if (optlen > 4) {
677 /* there are sub-options */
678 dhcp6opt_print((u_char *)(dh6o + 1) + 4,
679 (u_char *)(dh6o + 1) + optlen);
680 }
681 printf(")");
682 break;
683 case DH6OPT_IA_PD_PREFIX:
684 if (optlen < sizeof(ia_prefix) - 4) {
685 printf(" ?)");
686 break;
687 }
688 memcpy(&ia_prefix, (u_char *)dh6o, sizeof(ia_prefix));
689 printf(" %s/%d",
690 ip6addr_string(&ia_prefix.dh6opt_ia_prefix_addr),
691 ia_prefix.dh6opt_ia_prefix_plen);
692 ia_prefix.dh6opt_ia_prefix_pltime =
693 ntohl(ia_prefix.dh6opt_ia_prefix_pltime);
694 ia_prefix.dh6opt_ia_prefix_vltime =
695 ntohl(ia_prefix.dh6opt_ia_prefix_vltime);
696 printf(" pltime:%lu vltime:%lu",
697 (unsigned long)ia_prefix.dh6opt_ia_prefix_pltime,
698 (unsigned long)ia_prefix.dh6opt_ia_prefix_vltime);
699 if (optlen > sizeof(ia_prefix) - 4) {
700 /* there are sub-options */
701 dhcp6opt_print((u_char *)dh6o +
702 sizeof(ia_prefix),
703 (u_char *)(dh6o + 1) + optlen);
704 }
705 printf(")");
706 break;
707 case DH6OPT_LIFETIME:
708 case DH6OPT_CLT_TIME:
709 if (optlen != 4) {
710 printf(" ?)");
711 break;
712 }
713 memcpy(&val32, dh6o + 1, sizeof(val32));
714 val32 = ntohl(val32);
715 printf(" %d)", (int)val32);
716 break;
717 case DH6OPT_REMOTE_ID:
718 if (optlen < 4) {
719 printf(" ?)");
720 break;
721 }
722 tp = (u_char *)(dh6o + 1);
723 memcpy(&val32, &tp[0], sizeof(val32));
724 val32 = ntohl(val32);
725 printf(" %d ", (int)val32);
726 /*
727 * Print hex dump first 10 characters.
728 */
729 for (i = 4; i < optlen && i < 14; i++)
730 printf("%02x", tp[i]);
731 printf("...)");
732 break;
733 case DH6OPT_LQ_QUERY:

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750 printf(" %s", ip6addr_string(&tp[1]));
751 if (optlen > 17) {
752 /* there are query-options */
753 dhcp6opt_print(tp + 17, tp + optlen);
754 }
755 printf(")");
756 break;
757 case DH6OPT_CLIENT_DATA:
758 if (optlen > 0) {
759 /* there are encapsulated options */
760 dhcp6opt_print((u_char *)(dh6o + 1),
761 (u_char *)(dh6o + 1) + optlen);
762 }
763 printf(")");
764 break;
765 case DH6OPT_LQ_RELAY_DATA:
766 if (optlen < 16) {
767 printf(" ?)");
768 break;
769 }

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