print-dhcp6.c - platform/external/tcpdump - Gitiles

 /*
  * Copyright (C) 1998 and 1999 WIDE Project.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. Neither the name of the project nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
 /*
  * RFC3315: DHCPv6
  * supported DHCPv6 options:
  *  RFC3319,
  *  RFC3633,
  *  RFC3646,
  *  RFC3898,
  *  RFC4075,
  *  RFC4242,
  *  RFC4280,
  */

 #ifndef lint
 static const char rcsid[] _U_ =
     "@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.35.2.1 2006/10/25 22:04:36 guy Exp $";
 #endif

 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include <tcpdump-stdinc.h>

 #include <stdio.h>
 #include <string.h>

 #include "interface.h"
 #include "addrtoname.h"
 #include "extract.h"

 /* lease duration */
 #define DHCP6_DURATITION_INFINITE 0xffffffff

 /* Error Values */
 #define DH6ERR_FAILURE		16
 #define DH6ERR_AUTHFAIL		17
 #define DH6ERR_POORLYFORMED	18
 #define DH6ERR_UNAVAIL		19
 #define DH6ERR_OPTUNAVAIL	20

 /* Message type */
 #define DH6_SOLICIT	1
 #define DH6_ADVERTISE	2
 #define DH6_REQUEST	3
 #define DH6_CONFIRM	4
 #define DH6_RENEW	5
 #define DH6_REBIND	6
 #define DH6_REPLY	7
 #define DH6_RELEASE	8
 #define DH6_DECLINE	9
 #define DH6_RECONFIGURE	10
 #define DH6_INFORM_REQ	11
 #define DH6_RELAY_FORW	12
 #define DH6_RELAY_REPLY	13

 /* DHCP6 base packet format */
 struct dhcp6 {
 	union {
 		u_int8_t m;
 		u_int32_t x;
 	} dh6_msgtypexid;
 	/* options follow */
 };
 #define dh6_msgtype	dh6_msgtypexid.m
 #define dh6_xid		dh6_msgtypexid.x
 #define DH6_XIDMASK	0x00ffffff

 /* DHCPv6 relay messages */
 struct dhcp6_relay {
 	u_int8_t dh6relay_msgtype;
 	u_int8_t dh6relay_hcnt;
 	u_int8_t dh6relay_linkaddr[16];	/* XXX: badly aligned */
 	u_int8_t dh6relay_peeraddr[16];
 	/* options follow */
 };

 /* options */
 #define DH6OPT_CLIENTID	1
 #define DH6OPT_SERVERID	2
 #define DH6OPT_IA_NA 3
 #define DH6OPT_IA_TA 4
 #define DH6OPT_IA_ADDR 5
 #define DH6OPT_ORO 6
 #define DH6OPT_PREFERENCE 7
 #  define DH6OPT_PREF_MAX 255
 #define DH6OPT_ELAPSED_TIME 8
 #define DH6OPT_RELAY_MSG 9
 /*#define DH6OPT_SERVER_MSG 10 deprecated */
 #define DH6OPT_AUTH 11
 #  define DH6OPT_AUTHPROTO_DELAYED 2
 #  define DH6OPT_AUTHPROTO_RECONFIG 3
 #  define DH6OPT_AUTHALG_HMACMD5 1
 #  define DH6OPT_AUTHRDM_MONOCOUNTER 0
 #  define DH6OPT_AUTHRECONFIG_KEY 1
 #  define DH6OPT_AUTHRECONFIG_HMACMD5 2
 #define DH6OPT_UNICAST 12
 #define DH6OPT_STATUS_CODE 13
 #  define DH6OPT_STCODE_SUCCESS 0
 #  define DH6OPT_STCODE_UNSPECFAIL 1
 #  define DH6OPT_STCODE_NOADDRAVAIL 2
 #  define DH6OPT_STCODE_NOBINDING 3
 #  define DH6OPT_STCODE_NOTONLINK 4
 #  define DH6OPT_STCODE_USEMULTICAST 5
 #  define DH6OPT_STCODE_NOPREFIXAVAIL 6
 #define DH6OPT_RAPID_COMMIT 14
 #define DH6OPT_USER_CLASS 15
 #define DH6OPT_VENDOR_CLASS 16
 #define DH6OPT_VENDOR_OPTS 17
 #define DH6OPT_INTERFACE_ID 18
 #define DH6OPT_RECONF_MSG 19
 #define DH6OPT_RECONF_ACCEPT 20
 #define DH6OPT_SIP_SERVER_D 21
 #define DH6OPT_SIP_SERVER_A 22
 #define DH6OPT_DNS 23
 #define DH6OPT_DNSNAME 24
 #define DH6OPT_IA_PD 25
 #define DH6OPT_IA_PD_PREFIX 26
 #define DH6OPT_NIS_SERVERS 27
 #define DH6OPT_NISP_SERVERS 28
 #define DH6OPT_NIS_NAME 29
 #define DH6OPT_NISP_NAME 30
 #define DH6OPT_NTP_SERVERS 31
 #define DH6OPT_LIFETIME 32
 #define DH6OPT_BCMCS_SERVER_D 33
 #define DH6OPT_BCMCS_SERVER_A 34
 #define DH6OPT_GEOCONF_CIVIC 36
 #define DH6OPT_REMOTE_ID 37
 #define DH6OPT_SUBSCRIBER_ID 38
 #define DH6OPT_CLIENT_FQDN 39

 struct dhcp6opt {
 	u_int16_t dh6opt_type;
 	u_int16_t dh6opt_len;
 	/* type-dependent data follows */
 };

 struct dhcp6_ia {
 	u_int16_t dh6opt_ia_type;
 	u_int16_t dh6opt_ia_len;
 	u_int32_t dh6opt_ia_iaid;
 	u_int32_t dh6opt_ia_t1;
 	u_int32_t dh6opt_ia_t2;
 };

 struct dhcp6_ia_addr {
 	u_int16_t dh6opt_ia_addr_type;
 	u_int16_t dh6opt_ia_addr_len;
 	struct in6_addr dh6opt_ia_addr_addr;
 	u_int32_t dh6opt_ia_addr_pltime;
 	u_int32_t dh6opt_ia_addr_vltime;
 }  __attribute__ ((__packed__));

 struct dhcp6_ia_prefix {
 	u_int16_t dh6opt_ia_prefix_type;
 	u_int16_t dh6opt_ia_prefix_len;
 	u_int32_t dh6opt_ia_prefix_pltime;
 	u_int32_t dh6opt_ia_prefix_vltime;
 	u_int8_t dh6opt_ia_prefix_plen;
 	struct in6_addr dh6opt_ia_prefix_addr;
 }  __attribute__ ((__packed__));

 struct dhcp6_auth {
 	u_int16_t dh6opt_auth_type;
 	u_int16_t dh6opt_auth_len;
 	u_int8_t dh6opt_auth_proto;
 	u_int8_t dh6opt_auth_alg;
 	u_int8_t dh6opt_auth_rdm;
 	u_int8_t dh6opt_auth_rdinfo[8];
 	/* authentication information follows */
 } __attribute__ ((__packed__));

 static const char *
 dhcp6opt_name(int type)
 {
 	static char genstr[sizeof("opt_65535") + 1]; /* XXX thread unsafe */

 	if (type > 65535)
 		return "INVALID option";

 	switch(type) {
 	case DH6OPT_CLIENTID:
 		return "client ID";
 	case DH6OPT_SERVERID:
 		return "server ID";
 	case DH6OPT_IA_NA:
 		return "IA_NA";
 	case DH6OPT_IA_TA:
 		return "IA_TA";
 	case DH6OPT_IA_ADDR:
 		return "IA_ADDR";
 	case DH6OPT_ORO:
 		return "option request";
 	case DH6OPT_PREFERENCE:
 		return "preference";
 	case DH6OPT_ELAPSED_TIME:
 		return "elapsed time";
 	case DH6OPT_RELAY_MSG:
 		return "relay message";
 	case DH6OPT_AUTH:
 		return "authentication";
 	case DH6OPT_UNICAST:
 		return "server unicast";
 	case DH6OPT_STATUS_CODE:
 		return "status code";
 	case DH6OPT_RAPID_COMMIT:
 		return "rapid commit";
 	case DH6OPT_USER_CLASS:
 		return "user class";
 	case DH6OPT_VENDOR_CLASS:
 		return "vendor class";
 	case DH6OPT_VENDOR_OPTS:
 		return "vendor-specific info";
 	case DH6OPT_INTERFACE_ID:
 		return "interface ID";
 	case DH6OPT_RECONF_MSG:
 		return "reconfigure message";
 	case DH6OPT_RECONF_ACCEPT:
 		return "reconfigure accept";
 	case DH6OPT_SIP_SERVER_D:
 		return "SIP servers domain";
 	case DH6OPT_SIP_SERVER_A:
 		return "SIP servers address";
 	case DH6OPT_DNS:
 		return "DNS";
 	case DH6OPT_DNSNAME:
 		return "DNS name";
 	case DH6OPT_IA_PD:
 		return "IA_PD";
 	case DH6OPT_IA_PD_PREFIX:
 		return "IA_PD prefix";
 	case DH6OPT_NTP_SERVERS:
 		return "NTP Server";
 	case DH6OPT_LIFETIME:
 		return "lifetime";
 	case DH6OPT_NIS_SERVERS:
 		return "NIS server";
 	case DH6OPT_NISP_SERVERS:
 		return "NIS+ server";
 	case DH6OPT_NIS_NAME:
 		return "NIS domain name";
 	case DH6OPT_NISP_NAME:
 		return "NIS+ domain name";
 	case DH6OPT_BCMCS_SERVER_D:
 		return "BCMCS domain name";
 	case DH6OPT_BCMCS_SERVER_A:
 		return "BCMCS server";
 	case DH6OPT_GEOCONF_CIVIC:
 		return "Geoconf Civic";
 	case DH6OPT_REMOTE_ID:
 		return "Remote ID";
 	case DH6OPT_SUBSCRIBER_ID:
 		return "Subscriber ID";
 	case DH6OPT_CLIENT_FQDN:
 		return "Client FQDN";
 	default:
 		snprintf(genstr, sizeof(genstr), "opt_%d", type);
 		return(genstr);
 	}
 }

 static const char *
 dhcp6stcode(int code)
 {
 	static char genstr[sizeof("code255") + 1]; /* XXX thread unsafe */

 	if (code > 255)
 		return "INVALID code";

 	switch(code) {
 	case DH6OPT_STCODE_SUCCESS:
 		return "success";
 	case DH6OPT_STCODE_UNSPECFAIL:
 		return "unspec failure";
 	case DH6OPT_STCODE_NOADDRAVAIL:
 		return "no addresses";
 	case DH6OPT_STCODE_NOBINDING:
 		return "no binding";
 	case DH6OPT_STCODE_NOTONLINK:
 		return "not on-link";
 	case DH6OPT_STCODE_USEMULTICAST:
 		return "use multicast";
 	case DH6OPT_STCODE_NOPREFIXAVAIL:
 		return "no prefixes";
 	default:
 		snprintf(genstr, sizeof(genstr), "code%d", code);
 		return(genstr);
 	}
 }

 static void
 dhcp6opt_print(const u_char *cp, const u_char *ep)
 {
 	struct dhcp6opt *dh6o;
 	u_char *tp;
 	size_t i;
 	u_int16_t opttype;
 	size_t optlen;
 	u_int16_t val16;
 	u_int32_t val32;
 	struct dhcp6_ia ia;
 	struct dhcp6_ia_prefix ia_prefix;
 	struct dhcp6_ia_addr ia_addr;
 	struct dhcp6_auth authopt;
 	u_int authinfolen, authrealmlen;

 	if (cp == ep)
 		return;
 	while (cp < ep) {
 		if (ep < cp + sizeof(*dh6o))
 			goto trunc;
 		dh6o = (struct dhcp6opt *)cp;
 		optlen = EXTRACT_16BITS(&dh6o->dh6opt_len);
 		if (ep < cp + sizeof(*dh6o) + optlen)
 			goto trunc;
 		opttype = EXTRACT_16BITS(&dh6o->dh6opt_type);
 		printf(" (%s", dhcp6opt_name(opttype));
 		switch (opttype) {
 		case DH6OPT_CLIENTID:
 		case DH6OPT_SERVERID:
 			if (optlen < 2) {
 				/*(*/
 				printf(" ?)");
 				break;
 			}
 			tp = (u_char *)(dh6o + 1);
 			switch (EXTRACT_16BITS(tp)) {
 			case 1:
 				if (optlen >= 2 + 6) {
 					printf(" hwaddr/time type %u time %u ",
 					    EXTRACT_16BITS(&tp[2]),
 					    EXTRACT_32BITS(&tp[4]));
 					for (i = 8; i < optlen; i++)
 						printf("%02x", tp[i]);
 					/*(*/
 					printf(")");
 				} else {
 					/*(*/
 					printf(" ?)");
 				}
 				break;
 			case 2:
 				if (optlen >= 2 + 8) {
 					printf(" vid ");
 					for (i = 2; i < 2 + 8; i++)
 						printf("%02x", tp[i]);
 					/*(*/
 					printf(")");
 				} else {
 					/*(*/
 					printf(" ?)");
 				}
 				break;
 			case 3:
 				if (optlen >= 2 + 2) {
 					printf(" hwaddr type %u ",
 					    EXTRACT_16BITS(&tp[2]));
 					for (i = 4; i < optlen; i++)
 						printf("%02x", tp[i]);
 					/*(*/
 					printf(")");
 				} else {
 					/*(*/
 					printf(" ?)");
 				}
 				break;
 			default:
 				printf(" type %d)", EXTRACT_16BITS(tp));
 				break;
 			}
 			break;
 		case DH6OPT_IA_ADDR:
 			if (optlen < sizeof(ia_addr) - 4) {
 				printf(" ?)");
 				break;
 			}
 			memcpy(&ia_addr, (u_char *)dh6o, sizeof(ia_addr));
 			printf(" %s",
 			    ip6addr_string(&ia_addr.dh6opt_ia_addr_addr));
 			ia_addr.dh6opt_ia_addr_pltime =
 			    ntohl(ia_addr.dh6opt_ia_addr_pltime);
 			ia_addr.dh6opt_ia_addr_vltime =
 			    ntohl(ia_addr.dh6opt_ia_addr_vltime);
 			printf(" pltime:%lu vltime:%lu",
 			    (unsigned long)ia_addr.dh6opt_ia_addr_pltime,
 			    (unsigned long)ia_addr.dh6opt_ia_addr_vltime);
 			if (optlen > sizeof(ia_addr) - 4) {
 				/* there are sub-options */
 				dhcp6opt_print((u_char *)dh6o +
 				    sizeof(ia_addr),
 				    (u_char *)(dh6o + 1) + optlen);
 			}
 			printf(")");
 			break;
 		case DH6OPT_ORO:
 			if (optlen % 2) {
 				printf(" ?)");
 				break;
 			}
 			tp = (u_char *)(dh6o + 1);
 			for (i = 0; i < optlen; i += 2) {
 				u_int16_t opt;

 				memcpy(&opt, &tp[i], sizeof(opt));
 				printf(" %s", dhcp6opt_name(ntohs(opt)));
 			}
 			printf(")");
 			break;
 		case DH6OPT_PREFERENCE:
 			if (optlen != 1) {
 				printf(" ?)");
 				break;
 			}
 			printf(" %d)", *((u_char *)(dh6o + 1) + 1));
 			break;
 		case DH6OPT_ELAPSED_TIME:
 			if (optlen != 2) {
 				printf(" ?)");
 				break;
 			}
 			memcpy(&val16, dh6o + 1, sizeof(val16));
 			val16 = ntohs(val16);
 			printf(" %d)", (int)val16);
 			break;
 		case DH6OPT_RELAY_MSG:
 			printf(" (");
 			dhcp6_print((const u_char *)(dh6o + 1), optlen);
 			printf(")");
 			break;
 		case DH6OPT_AUTH:
 			if (optlen < sizeof(authopt) - sizeof(*dh6o)) {
 				printf(" ?)");
 				break;
 			}
 			memcpy(&authopt, dh6o, sizeof(authopt));
 			switch (authopt.dh6opt_auth_proto) {
 			case DH6OPT_AUTHPROTO_DELAYED:
 				printf(" proto: delayed");
 				break;
 			case DH6OPT_AUTHPROTO_RECONFIG:
 				printf(" proto: reconfigure");
 				break;
 			default:
 				printf(" proto: %d",
 				    authopt.dh6opt_auth_proto);
 				break;
 			}
 			switch (authopt.dh6opt_auth_alg) {
 			case DH6OPT_AUTHALG_HMACMD5:
 				/* XXX: may depend on the protocol */
 				printf(", alg: HMAC-MD5");
 				break;
 			default:
 				printf(", alg: %d", authopt.dh6opt_auth_alg);
 				break;
 			}
 			switch (authopt.dh6opt_auth_rdm) {
 			case DH6OPT_AUTHRDM_MONOCOUNTER:
 				printf(", RDM: mono");
 				break;
 			default:
 				printf(", RDM: %d", authopt.dh6opt_auth_rdm);
 				break;
 			}
 			tp = (u_char *)&authopt.dh6opt_auth_rdinfo;
 			printf(", RD:");
 			for (i = 0; i < 4; i++, tp += sizeof(val16))
 				printf(" %04x", EXTRACT_16BITS(tp));

 			/* protocol dependent part */
 			tp = (u_char *)dh6o + sizeof(authopt);
 			authinfolen =
 			    optlen + sizeof(*dh6o) - sizeof(authopt);
 			switch (authopt.dh6opt_auth_proto) {
 			case DH6OPT_AUTHPROTO_DELAYED:
 				if (authinfolen == 0)
 					break;
 				if (authinfolen < 20) {
 					printf(" ??");
 					break;
 				}
 				authrealmlen = authinfolen - 20;
 				if (authrealmlen > 0) {
 					printf(", realm: ");
 				}
 				for (i = 0; i < authrealmlen; i++, tp++)
 					printf("%02x", *tp);
 				printf(", key ID: %08x", EXTRACT_32BITS(tp));
 				tp += 4;
 				printf(", HMAC-MD5:");
 				for (i = 0; i < 4; i++, tp+= 4)
 					printf(" %08x", EXTRACT_32BITS(tp));
 				break;
 			case DH6OPT_AUTHPROTO_RECONFIG:
 				if (authinfolen != 17) {
 					printf(" ??");
 					break;
 				}
 				switch (*tp++) {
 				case DH6OPT_AUTHRECONFIG_KEY:
 					printf(" reconfig-key");
 					break;
 				case DH6OPT_AUTHRECONFIG_HMACMD5:
 					printf(" type: HMAC-MD5");
 					break;
 				default:
 					printf(" type: ??");
 					break;
 				}
 				printf(" value:");
 				for (i = 0; i < 4; i++, tp+= 4)
 					printf(" %08x", EXTRACT_32BITS(tp));
 				break;
 			default:
 				printf(" ??");
 				break;
 			}

 			printf(")");
 			break;
 		case DH6OPT_RAPID_COMMIT: /* nothing todo */
 			printf(")");
 			break;
 		case DH6OPT_INTERFACE_ID:
 			/*
 			 * Since we cannot predict the encoding, print hex dump
 			 * at most 10 characters.
 			 */
 			for (i = 0; i < optlen && i < 10; i++)
 				printf("%02x", ((u_char *)(dh6o + 1))[i]);
 			break;
 		case DH6OPT_RECONF_MSG:
 			tp = (u_char *)(dh6o + 1);
 			switch (*tp) {
 			case DH6_RENEW:
 				printf(" for renew)");
 				break;
 			case DH6_INFORM_REQ:
 				printf(" for inf-req)");
 				break;
 			default:
 				printf(" for ?\?\?(%02x))", *tp);
 				break;
 			}
 			break;
 		case DH6OPT_RECONF_ACCEPT: /* nothing todo */
 			printf(")");
 			break;
 		case DH6OPT_SIP_SERVER_A:
 		case DH6OPT_DNS:
 		case DH6OPT_NTP_SERVERS:
 		case DH6OPT_NIS_SERVERS:
 		case DH6OPT_NISP_SERVERS:
 		case DH6OPT_BCMCS_SERVER_A:
 			if (optlen % 16) {
 				printf(" ?)");
 				break;
 			}
 			tp = (u_char *)(dh6o + 1);
 			for (i = 0; i < optlen; i += 16)
 				printf(" %s", ip6addr_string(&tp[i]));
 			printf(")");
 			break;
 		case DH6OPT_STATUS_CODE:
 			if (optlen < 2) {
 				printf(" ?)");
 				break;
 			}
 			memcpy(&val16, (u_char *)(dh6o + 1), sizeof(val16));
 			val16 = ntohs(val16);
 			printf(" %s)", dhcp6stcode(val16));
 			break;
 		case DH6OPT_IA_NA:
 		case DH6OPT_IA_PD:
 			if (optlen < sizeof(ia) - 4) {
 				printf(" ?)");
 				break;
 			}
 			memcpy(&ia, (u_char *)dh6o, sizeof(ia));
 			ia.dh6opt_ia_iaid = ntohl(ia.dh6opt_ia_iaid);
 			ia.dh6opt_ia_t1 = ntohl(ia.dh6opt_ia_t1);
 			ia.dh6opt_ia_t2 = ntohl(ia.dh6opt_ia_t2);
 			printf(" IAID:%lu T1:%lu T2:%lu",
 			    (unsigned long)ia.dh6opt_ia_iaid,
 			    (unsigned long)ia.dh6opt_ia_t1,
 			    (unsigned long)ia.dh6opt_ia_t2);
 			if (optlen > sizeof(ia) - 4) {
 				/* there are sub-options */
 				dhcp6opt_print((u_char *)dh6o + sizeof(ia),
 				    (u_char *)(dh6o + 1) + optlen);
 			}
 			printf(")");
 			break;
 		case DH6OPT_IA_PD_PREFIX:
 			if (optlen < sizeof(ia_prefix) - 4) {
 				printf(" ?)");
 				break;
 			}
 			memcpy(&ia_prefix, (u_char *)dh6o, sizeof(ia_prefix));
 			printf(" %s/%d",
 			    ip6addr_string(&ia_prefix.dh6opt_ia_prefix_addr),
 			    ia_prefix.dh6opt_ia_prefix_plen);
 			ia_prefix.dh6opt_ia_prefix_pltime =
 			    ntohl(ia_prefix.dh6opt_ia_prefix_pltime);
 			ia_prefix.dh6opt_ia_prefix_vltime =
 			    ntohl(ia_prefix.dh6opt_ia_prefix_vltime);
 			printf(" pltime:%lu vltime:%lu",
 			    (unsigned long)ia_prefix.dh6opt_ia_prefix_pltime,
 			    (unsigned long)ia_prefix.dh6opt_ia_prefix_vltime);
 			if (optlen > sizeof(ia_prefix) - 4) {
 				/* there are sub-options */
 				dhcp6opt_print((u_char *)dh6o +
 				    sizeof(ia_prefix),
 				    (u_char *)(dh6o + 1) + optlen);
 			}
 			printf(")");
 			break;
 		case DH6OPT_LIFETIME:
 			if (optlen != 4) {
 				printf(" ?)");
 				break;
 			}
 			memcpy(&val32, dh6o + 1, sizeof(val32));
 			val32 = ntohl(val32);
 			printf(" %d)", (int)val32);
 			break;
 		default:
 			printf(")");
 			break;
 		}

 		cp += sizeof(*dh6o) + optlen;
 	}
 	return;

 trunc:
 	printf("[|dhcp6ext]");
 }

 /*
  * Print dhcp6 packets
  */
 void
 dhcp6_print(const u_char *cp, u_int length)
 {
 	struct dhcp6 *dh6;
 	struct dhcp6_relay *dh6relay;
 	const u_char *ep;
 	u_char *extp;
 	const char *name;

 	printf("dhcp6");

 	ep = (u_char *)snapend;
 	if (cp + length < ep)
 		ep = cp + length;

 	dh6 = (struct dhcp6 *)cp;
 	dh6relay = (struct dhcp6_relay *)cp;
 	TCHECK(dh6->dh6_xid);
 	switch (dh6->dh6_msgtype) {
 	case DH6_SOLICIT:
 		name = "solicit";
 		break;
 	case DH6_ADVERTISE:
 		name = "advertise";
 		break;
 	case DH6_REQUEST:
 		name = "request";
 		break;
 	case DH6_CONFIRM:
 		name = "confirm";
 		break;
 	case DH6_RENEW:
 		name = "renew";
 		break;
 	case DH6_REBIND:
 		name = "rebind";
 		break;
 	case DH6_REPLY:
 		name = "reply";
 		break;
 	case DH6_RELEASE:
 		name = "release";
 		break;
 	case DH6_DECLINE:
 		name = "decline";
 		break;
 	case DH6_RECONFIGURE:
 		name = "reconfigure";
 		break;
 	case DH6_INFORM_REQ:
 		name= "inf-req";
 		break;
 	case DH6_RELAY_FORW:
 		name= "relay-fwd";
 		break;
 	case DH6_RELAY_REPLY:
 		name= "relay-reply";
 		break;
 	default:
 		name = NULL;
 		break;
 	}

 	if (!vflag) {
 		if (name)
 			printf(" %s", name);
 		else if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
 		    dh6->dh6_msgtype != DH6_RELAY_REPLY) {
 			printf(" msgtype-%u", dh6->dh6_msgtype);
 		}
 		return;
 	}

 	/* XXX relay agent messages have to be handled differently */

 	if (name)
 		printf(" %s (", name);	/*)*/
 	else
 		printf(" msgtype-%u (", dh6->dh6_msgtype);	/*)*/
 	if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
 	    dh6->dh6_msgtype != DH6_RELAY_REPLY) {
 		printf("xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK);
 		extp = (u_char *)(dh6 + 1);
 		dhcp6opt_print(extp, ep);
 	} else {		/* relay messages */
 		struct in6_addr addr6;

 		TCHECK(dh6relay->dh6relay_peeraddr);

 		memcpy(&addr6, dh6relay->dh6relay_linkaddr, sizeof (addr6));
 		printf("linkaddr=%s", ip6addr_string(&addr6));

 		memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6));
 		printf(" peeraddr=%s", ip6addr_string(&addr6));

 		dhcp6opt_print((u_char *)(dh6relay + 1), ep);
 	}
 	/*(*/
 	printf(")");
 	return;

 trunc:
 	printf("[|dhcp6]");
 }
	/*
	* Copyright (C) 1998 and 1999 WIDE Project.
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. Neither the name of the project nor the names of its contributors
	* may be used to endorse or promote products derived from this software
	* without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*/
	/*
	* RFC3315: DHCPv6
	* supported DHCPv6 options:
	* RFC3319,
	* RFC3633,
	* RFC3646,
	* RFC3898,
	* RFC4075,
	* RFC4242,
	* RFC4280,
	*/

	#ifndef lint
	static const char rcsid[] _U_ =
	"@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.35.2.1 2006/10/25 22:04:36 guy Exp $";
	#endif

	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include <tcpdump-stdinc.h>

	#include <stdio.h>
	#include <string.h>

	#include "interface.h"
	#include "addrtoname.h"
	#include "extract.h"

	/* lease duration */
	#define DHCP6_DURATITION_INFINITE 0xffffffff

	/* Error Values */
	#define DH6ERR_FAILURE 16
	#define DH6ERR_AUTHFAIL 17
	#define DH6ERR_POORLYFORMED 18
	#define DH6ERR_UNAVAIL 19
	#define DH6ERR_OPTUNAVAIL 20

	/* Message type */
	#define DH6_SOLICIT 1
	#define DH6_ADVERTISE 2
	#define DH6_REQUEST 3
	#define DH6_CONFIRM 4
	#define DH6_RENEW 5
	#define DH6_REBIND 6
	#define DH6_REPLY 7
	#define DH6_RELEASE 8
	#define DH6_DECLINE 9
	#define DH6_RECONFIGURE 10
	#define DH6_INFORM_REQ 11
	#define DH6_RELAY_FORW 12
	#define DH6_RELAY_REPLY 13

	/* DHCP6 base packet format */
	struct dhcp6 {
	union {
	u_int8_t m;
	u_int32_t x;
	} dh6_msgtypexid;
	/* options follow */
	};
	#define dh6_msgtype dh6_msgtypexid.m
	#define dh6_xid dh6_msgtypexid.x
	#define DH6_XIDMASK 0x00ffffff

	/* DHCPv6 relay messages */
	struct dhcp6_relay {
	u_int8_t dh6relay_msgtype;
	u_int8_t dh6relay_hcnt;
	u_int8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */
	u_int8_t dh6relay_peeraddr[16];
	/* options follow */
	};

	/* options */
	#define DH6OPT_CLIENTID 1
	#define DH6OPT_SERVERID 2
	#define DH6OPT_IA_NA 3
	#define DH6OPT_IA_TA 4
	#define DH6OPT_IA_ADDR 5
	#define DH6OPT_ORO 6
	#define DH6OPT_PREFERENCE 7
	# define DH6OPT_PREF_MAX 255
	#define DH6OPT_ELAPSED_TIME 8
	#define DH6OPT_RELAY_MSG 9
	/#define DH6OPT_SERVER_MSG 10 deprecated /
	#define DH6OPT_AUTH 11
	# define DH6OPT_AUTHPROTO_DELAYED 2
	# define DH6OPT_AUTHPROTO_RECONFIG 3
	# define DH6OPT_AUTHALG_HMACMD5 1
	# define DH6OPT_AUTHRDM_MONOCOUNTER 0
	# define DH6OPT_AUTHRECONFIG_KEY 1
	# define DH6OPT_AUTHRECONFIG_HMACMD5 2
	#define DH6OPT_UNICAST 12
	#define DH6OPT_STATUS_CODE 13
	# define DH6OPT_STCODE_SUCCESS 0
	# define DH6OPT_STCODE_UNSPECFAIL 1
	# define DH6OPT_STCODE_NOADDRAVAIL 2
	# define DH6OPT_STCODE_NOBINDING 3
	# define DH6OPT_STCODE_NOTONLINK 4
	# define DH6OPT_STCODE_USEMULTICAST 5
	# define DH6OPT_STCODE_NOPREFIXAVAIL 6
	#define DH6OPT_RAPID_COMMIT 14
	#define DH6OPT_USER_CLASS 15
	#define DH6OPT_VENDOR_CLASS 16
	#define DH6OPT_VENDOR_OPTS 17
	#define DH6OPT_INTERFACE_ID 18
	#define DH6OPT_RECONF_MSG 19
	#define DH6OPT_RECONF_ACCEPT 20
	#define DH6OPT_SIP_SERVER_D 21
	#define DH6OPT_SIP_SERVER_A 22
	#define DH6OPT_DNS 23
	#define DH6OPT_DNSNAME 24
	#define DH6OPT_IA_PD 25
	#define DH6OPT_IA_PD_PREFIX 26
	#define DH6OPT_NIS_SERVERS 27
	#define DH6OPT_NISP_SERVERS 28
	#define DH6OPT_NIS_NAME 29
	#define DH6OPT_NISP_NAME 30
	#define DH6OPT_NTP_SERVERS 31
	#define DH6OPT_LIFETIME 32
	#define DH6OPT_BCMCS_SERVER_D 33
	#define DH6OPT_BCMCS_SERVER_A 34
	#define DH6OPT_GEOCONF_CIVIC 36
	#define DH6OPT_REMOTE_ID 37
	#define DH6OPT_SUBSCRIBER_ID 38
	#define DH6OPT_CLIENT_FQDN 39

	struct dhcp6opt {
	u_int16_t dh6opt_type;
	u_int16_t dh6opt_len;
	/* type-dependent data follows */
	};

	struct dhcp6_ia {
	u_int16_t dh6opt_ia_type;
	u_int16_t dh6opt_ia_len;
	u_int32_t dh6opt_ia_iaid;
	u_int32_t dh6opt_ia_t1;
	u_int32_t dh6opt_ia_t2;
	};

	struct dhcp6_ia_addr {
	u_int16_t dh6opt_ia_addr_type;
	u_int16_t dh6opt_ia_addr_len;
	struct in6_addr dh6opt_ia_addr_addr;
	u_int32_t dh6opt_ia_addr_pltime;
	u_int32_t dh6opt_ia_addr_vltime;
	} __attribute__ ((__packed__));

	struct dhcp6_ia_prefix {
	u_int16_t dh6opt_ia_prefix_type;
	u_int16_t dh6opt_ia_prefix_len;
	u_int32_t dh6opt_ia_prefix_pltime;
	u_int32_t dh6opt_ia_prefix_vltime;
	u_int8_t dh6opt_ia_prefix_plen;
	struct in6_addr dh6opt_ia_prefix_addr;
	} __attribute__ ((__packed__));

	struct dhcp6_auth {
	u_int16_t dh6opt_auth_type;
	u_int16_t dh6opt_auth_len;
	u_int8_t dh6opt_auth_proto;
	u_int8_t dh6opt_auth_alg;
	u_int8_t dh6opt_auth_rdm;
	u_int8_t dh6opt_auth_rdinfo[8];
	/* authentication information follows */
	} __attribute__ ((__packed__));

	static const char *
	dhcp6opt_name(int type)
	{
	static char genstr[sizeof("opt_65535") + 1]; /* XXX thread unsafe */

	if (type > 65535)
	return "INVALID option";

	switch(type) {
	case DH6OPT_CLIENTID:
	return "client ID";
	case DH6OPT_SERVERID:
	return "server ID";
	case DH6OPT_IA_NA:
	return "IA_NA";
	case DH6OPT_IA_TA:
	return "IA_TA";
	case DH6OPT_IA_ADDR:
	return "IA_ADDR";
	case DH6OPT_ORO:
	return "option request";
	case DH6OPT_PREFERENCE:
	return "preference";
	case DH6OPT_ELAPSED_TIME:
	return "elapsed time";
	case DH6OPT_RELAY_MSG:
	return "relay message";
	case DH6OPT_AUTH:
	return "authentication";
	case DH6OPT_UNICAST:
	return "server unicast";
	case DH6OPT_STATUS_CODE:
	return "status code";
	case DH6OPT_RAPID_COMMIT:
	return "rapid commit";
	case DH6OPT_USER_CLASS:
	return "user class";
	case DH6OPT_VENDOR_CLASS:
	return "vendor class";
	case DH6OPT_VENDOR_OPTS:
	return "vendor-specific info";
	case DH6OPT_INTERFACE_ID:
	return "interface ID";
	case DH6OPT_RECONF_MSG:
	return "reconfigure message";
	case DH6OPT_RECONF_ACCEPT:
	return "reconfigure accept";
	case DH6OPT_SIP_SERVER_D:
	return "SIP servers domain";
	case DH6OPT_SIP_SERVER_A:
	return "SIP servers address";
	case DH6OPT_DNS:
	return "DNS";
	case DH6OPT_DNSNAME:
	return "DNS name";
	case DH6OPT_IA_PD:
	return "IA_PD";
	case DH6OPT_IA_PD_PREFIX:
	return "IA_PD prefix";
	case DH6OPT_NTP_SERVERS:
	return "NTP Server";
	case DH6OPT_LIFETIME:
	return "lifetime";
	case DH6OPT_NIS_SERVERS:
	return "NIS server";
	case DH6OPT_NISP_SERVERS:
	return "NIS+ server";
	case DH6OPT_NIS_NAME:
	return "NIS domain name";
	case DH6OPT_NISP_NAME:
	return "NIS+ domain name";
	case DH6OPT_BCMCS_SERVER_D:
	return "BCMCS domain name";
	case DH6OPT_BCMCS_SERVER_A:
	return "BCMCS server";
	case DH6OPT_GEOCONF_CIVIC:
	return "Geoconf Civic";
	case DH6OPT_REMOTE_ID:
	return "Remote ID";
	case DH6OPT_SUBSCRIBER_ID:
	return "Subscriber ID";
	case DH6OPT_CLIENT_FQDN:
	return "Client FQDN";
	default:
	snprintf(genstr, sizeof(genstr), "opt_%d", type);
	return(genstr);
	}
	}

	static const char *
	dhcp6stcode(int code)
	{
	static char genstr[sizeof("code255") + 1]; /* XXX thread unsafe */

	if (code > 255)
	return "INVALID code";

	switch(code) {
	case DH6OPT_STCODE_SUCCESS:
	return "success";
	case DH6OPT_STCODE_UNSPECFAIL:
	return "unspec failure";
	case DH6OPT_STCODE_NOADDRAVAIL:
	return "no addresses";
	case DH6OPT_STCODE_NOBINDING:
	return "no binding";
	case DH6OPT_STCODE_NOTONLINK:
	return "not on-link";
	case DH6OPT_STCODE_USEMULTICAST:
	return "use multicast";
	case DH6OPT_STCODE_NOPREFIXAVAIL:
	return "no prefixes";
	default:
	snprintf(genstr, sizeof(genstr), "code%d", code);
	return(genstr);
	}
	}

	static void
	dhcp6opt_print(const u_char cp, const u_char ep)
	{
	struct dhcp6opt *dh6o;
	u_char *tp;
	size_t i;
	u_int16_t opttype;
	size_t optlen;
	u_int16_t val16;
	u_int32_t val32;
	struct dhcp6_ia ia;
	struct dhcp6_ia_prefix ia_prefix;
	struct dhcp6_ia_addr ia_addr;
	struct dhcp6_auth authopt;
	u_int authinfolen, authrealmlen;

	if (cp == ep)
	return;
	while (cp < ep) {
	if (ep < cp + sizeof(*dh6o))
	goto trunc;
	dh6o = (struct dhcp6opt *)cp;
	optlen = EXTRACT_16BITS(&dh6o->dh6opt_len);
	if (ep < cp + sizeof(*dh6o) + optlen)
	goto trunc;
	opttype = EXTRACT_16BITS(&dh6o->dh6opt_type);
	printf(" (%s", dhcp6opt_name(opttype));
	switch (opttype) {
	case DH6OPT_CLIENTID:
	case DH6OPT_SERVERID:
	if (optlen < 2) {
	/(/
	printf(" ?)");
	break;
	}
	tp = (u_char *)(dh6o + 1);
	switch (EXTRACT_16BITS(tp)) {
	case 1:
	if (optlen >= 2 + 6) {
	printf(" hwaddr/time type %u time %u ",
	EXTRACT_16BITS(&tp[2]),
	EXTRACT_32BITS(&tp[4]));
	for (i = 8; i < optlen; i++)
	printf("%02x", tp[i]);
	/(/
	printf(")");
	} else {
	/(/
	printf(" ?)");
	}
	break;
	case 2:
	if (optlen >= 2 + 8) {
	printf(" vid ");
	for (i = 2; i < 2 + 8; i++)
	printf("%02x", tp[i]);
	/(/
	printf(")");
	} else {
	/(/
	printf(" ?)");
	}
	break;
	case 3:
	if (optlen >= 2 + 2) {
	printf(" hwaddr type %u ",
	EXTRACT_16BITS(&tp[2]));
	for (i = 4; i < optlen; i++)
	printf("%02x", tp[i]);
	/(/
	printf(")");
	} else {
	/(/
	printf(" ?)");
	}
	break;
	default:
	printf(" type %d)", EXTRACT_16BITS(tp));
	break;
	}
	break;
	case DH6OPT_IA_ADDR:
	if (optlen < sizeof(ia_addr) - 4) {
	printf(" ?)");
	break;
	}
	memcpy(&ia_addr, (u_char *)dh6o, sizeof(ia_addr));
	printf(" %s",
	ip6addr_string(&ia_addr.dh6opt_ia_addr_addr));
	ia_addr.dh6opt_ia_addr_pltime =
	ntohl(ia_addr.dh6opt_ia_addr_pltime);
	ia_addr.dh6opt_ia_addr_vltime =
	ntohl(ia_addr.dh6opt_ia_addr_vltime);
	printf(" pltime:%lu vltime:%lu",
	(unsigned long)ia_addr.dh6opt_ia_addr_pltime,
	(unsigned long)ia_addr.dh6opt_ia_addr_vltime);
	if (optlen > sizeof(ia_addr) - 4) {
	/* there are sub-options */
	dhcp6opt_print((u_char *)dh6o +
	sizeof(ia_addr),
	(u_char *)(dh6o + 1) + optlen);
	}
	printf(")");
	break;
	case DH6OPT_ORO:
	if (optlen % 2) {
	printf(" ?)");
	break;
	}
	tp = (u_char *)(dh6o + 1);
	for (i = 0; i < optlen; i += 2) {
	u_int16_t opt;

	memcpy(&opt, &tp[i], sizeof(opt));
	printf(" %s", dhcp6opt_name(ntohs(opt)));
	}
	printf(")");
	break;
	case DH6OPT_PREFERENCE:
	if (optlen != 1) {
	printf(" ?)");
	break;
	}
	printf(" %d)", ((u_char )(dh6o + 1) + 1));
	break;
	case DH6OPT_ELAPSED_TIME:
	if (optlen != 2) {
	printf(" ?)");
	break;
	}
	memcpy(&val16, dh6o + 1, sizeof(val16));
	val16 = ntohs(val16);
	printf(" %d)", (int)val16);
	break;
	case DH6OPT_RELAY_MSG:
	printf(" (");
	dhcp6_print((const u_char *)(dh6o + 1), optlen);
	printf(")");
	break;
	case DH6OPT_AUTH:
	if (optlen < sizeof(authopt) - sizeof(*dh6o)) {
	printf(" ?)");
	break;
	}
	memcpy(&authopt, dh6o, sizeof(authopt));
	switch (authopt.dh6opt_auth_proto) {
	case DH6OPT_AUTHPROTO_DELAYED:
	printf(" proto: delayed");
	break;
	case DH6OPT_AUTHPROTO_RECONFIG:
	printf(" proto: reconfigure");
	break;
	default:
	printf(" proto: %d",
	authopt.dh6opt_auth_proto);
	break;
	}
	switch (authopt.dh6opt_auth_alg) {
	case DH6OPT_AUTHALG_HMACMD5:
	/* XXX: may depend on the protocol */
	printf(", alg: HMAC-MD5");
	break;
	default:
	printf(", alg: %d", authopt.dh6opt_auth_alg);
	break;
	}
	switch (authopt.dh6opt_auth_rdm) {
	case DH6OPT_AUTHRDM_MONOCOUNTER:
	printf(", RDM: mono");
	break;
	default:
	printf(", RDM: %d", authopt.dh6opt_auth_rdm);
	break;
	}
	tp = (u_char *)&authopt.dh6opt_auth_rdinfo;
	printf(", RD:");
	for (i = 0; i < 4; i++, tp += sizeof(val16))
	printf(" %04x", EXTRACT_16BITS(tp));

	/* protocol dependent part */
	tp = (u_char *)dh6o + sizeof(authopt);
	authinfolen =
	optlen + sizeof(*dh6o) - sizeof(authopt);
	switch (authopt.dh6opt_auth_proto) {
	case DH6OPT_AUTHPROTO_DELAYED:
	if (authinfolen == 0)
	break;
	if (authinfolen < 20) {
	printf(" ??");
	break;
	}
	authrealmlen = authinfolen - 20;
	if (authrealmlen > 0) {
	printf(", realm: ");
	}
	for (i = 0; i < authrealmlen; i++, tp++)
	printf("%02x", *tp);
	printf(", key ID: %08x", EXTRACT_32BITS(tp));
	tp += 4;
	printf(", HMAC-MD5:");
	for (i = 0; i < 4; i++, tp+= 4)
	printf(" %08x", EXTRACT_32BITS(tp));
	break;
	case DH6OPT_AUTHPROTO_RECONFIG:
	if (authinfolen != 17) {
	printf(" ??");
	break;
	}
	switch (*tp++) {
	case DH6OPT_AUTHRECONFIG_KEY:
	printf(" reconfig-key");
	break;
	case DH6OPT_AUTHRECONFIG_HMACMD5:
	printf(" type: HMAC-MD5");
	break;
	default:
	printf(" type: ??");
	break;
	}
	printf(" value:");
	for (i = 0; i < 4; i++, tp+= 4)
	printf(" %08x", EXTRACT_32BITS(tp));
	break;
	default:
	printf(" ??");
	break;
	}

	printf(")");
	break;
	case DH6OPT_RAPID_COMMIT: /* nothing todo */
	printf(")");
	break;
	case DH6OPT_INTERFACE_ID:
	/*
	* Since we cannot predict the encoding, print hex dump
	* at most 10 characters.
	*/
	for (i = 0; i < optlen && i < 10; i++)
	printf("%02x", ((u_char *)(dh6o + 1))[i]);
	break;
	case DH6OPT_RECONF_MSG:
	tp = (u_char *)(dh6o + 1);
	switch (*tp) {
	case DH6_RENEW:
	printf(" for renew)");
	break;
	case DH6_INFORM_REQ:
	printf(" for inf-req)");
	break;
	default:
	printf(" for ?\?\?(%02x))", *tp);
	break;
	}
	break;
	case DH6OPT_RECONF_ACCEPT: /* nothing todo */
	printf(")");
	break;
	case DH6OPT_SIP_SERVER_A:
	case DH6OPT_DNS:
	case DH6OPT_NTP_SERVERS:
	case DH6OPT_NIS_SERVERS:
	case DH6OPT_NISP_SERVERS:
	case DH6OPT_BCMCS_SERVER_A:
	if (optlen % 16) {
	printf(" ?)");
	break;
	}
	tp = (u_char *)(dh6o + 1);
	for (i = 0; i < optlen; i += 16)
	printf(" %s", ip6addr_string(&tp[i]));
	printf(")");
	break;
	case DH6OPT_STATUS_CODE:
	if (optlen < 2) {
	printf(" ?)");
	break;
	}
	memcpy(&val16, (u_char *)(dh6o + 1), sizeof(val16));
	val16 = ntohs(val16);
	printf(" %s)", dhcp6stcode(val16));
	break;
	case DH6OPT_IA_NA:
	case DH6OPT_IA_PD:
	if (optlen < sizeof(ia) - 4) {
	printf(" ?)");
	break;
	}
	memcpy(&ia, (u_char *)dh6o, sizeof(ia));
	ia.dh6opt_ia_iaid = ntohl(ia.dh6opt_ia_iaid);
	ia.dh6opt_ia_t1 = ntohl(ia.dh6opt_ia_t1);
	ia.dh6opt_ia_t2 = ntohl(ia.dh6opt_ia_t2);
	printf(" IAID:%lu T1:%lu T2:%lu",
	(unsigned long)ia.dh6opt_ia_iaid,
	(unsigned long)ia.dh6opt_ia_t1,
	(unsigned long)ia.dh6opt_ia_t2);
	if (optlen > sizeof(ia) - 4) {
	/* there are sub-options */
	dhcp6opt_print((u_char *)dh6o + sizeof(ia),
	(u_char *)(dh6o + 1) + optlen);
	}
	printf(")");
	break;
	case DH6OPT_IA_PD_PREFIX:
	if (optlen < sizeof(ia_prefix) - 4) {
	printf(" ?)");
	break;
	}
	memcpy(&ia_prefix, (u_char *)dh6o, sizeof(ia_prefix));
	printf(" %s/%d",
	ip6addr_string(&ia_prefix.dh6opt_ia_prefix_addr),
	ia_prefix.dh6opt_ia_prefix_plen);
	ia_prefix.dh6opt_ia_prefix_pltime =
	ntohl(ia_prefix.dh6opt_ia_prefix_pltime);
	ia_prefix.dh6opt_ia_prefix_vltime =
	ntohl(ia_prefix.dh6opt_ia_prefix_vltime);
	printf(" pltime:%lu vltime:%lu",
	(unsigned long)ia_prefix.dh6opt_ia_prefix_pltime,
	(unsigned long)ia_prefix.dh6opt_ia_prefix_vltime);
	if (optlen > sizeof(ia_prefix) - 4) {
	/* there are sub-options */
	dhcp6opt_print((u_char *)dh6o +
	sizeof(ia_prefix),
	(u_char *)(dh6o + 1) + optlen);
	}
	printf(")");
	break;
	case DH6OPT_LIFETIME:
	if (optlen != 4) {
	printf(" ?)");
	break;
	}
	memcpy(&val32, dh6o + 1, sizeof(val32));
	val32 = ntohl(val32);
	printf(" %d)", (int)val32);
	break;
	default:
	printf(")");
	break;
	}

	cp += sizeof(*dh6o) + optlen;
	}
	return;

	trunc:
	printf("[\|dhcp6ext]");
	}

	/*
	* Print dhcp6 packets
	*/
	void
	dhcp6_print(const u_char *cp, u_int length)
	{
	struct dhcp6 *dh6;
	struct dhcp6_relay *dh6relay;
	const u_char *ep;
	u_char *extp;
	const char *name;

	printf("dhcp6");

	ep = (u_char *)snapend;
	if (cp + length < ep)
	ep = cp + length;

	dh6 = (struct dhcp6 *)cp;
	dh6relay = (struct dhcp6_relay *)cp;
	TCHECK(dh6->dh6_xid);
	switch (dh6->dh6_msgtype) {
	case DH6_SOLICIT:
	name = "solicit";
	break;
	case DH6_ADVERTISE:
	name = "advertise";
	break;
	case DH6_REQUEST:
	name = "request";
	break;
	case DH6_CONFIRM:
	name = "confirm";
	break;
	case DH6_RENEW:
	name = "renew";
	break;
	case DH6_REBIND:
	name = "rebind";
	break;
	case DH6_REPLY:
	name = "reply";
	break;
	case DH6_RELEASE:
	name = "release";
	break;
	case DH6_DECLINE:
	name = "decline";
	break;
	case DH6_RECONFIGURE:
	name = "reconfigure";
	break;
	case DH6_INFORM_REQ:
	name= "inf-req";
	break;
	case DH6_RELAY_FORW:
	name= "relay-fwd";
	break;
	case DH6_RELAY_REPLY:
	name= "relay-reply";
	break;
	default:
	name = NULL;
	break;
	}

	if (!vflag) {
	if (name)
	printf(" %s", name);
	else if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
	dh6->dh6_msgtype != DH6_RELAY_REPLY) {
	printf(" msgtype-%u", dh6->dh6_msgtype);
	}
	return;
	}

	/* XXX relay agent messages have to be handled differently */

	if (name)
	printf(" %s (", name); /)/
	else
	printf(" msgtype-%u (", dh6->dh6_msgtype); /)/
	if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
	dh6->dh6_msgtype != DH6_RELAY_REPLY) {
	printf("xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK);
	extp = (u_char *)(dh6 + 1);
	dhcp6opt_print(extp, ep);
	} else { /* relay messages */
	struct in6_addr addr6;

	TCHECK(dh6relay->dh6relay_peeraddr);

	memcpy(&addr6, dh6relay->dh6relay_linkaddr, sizeof (addr6));
	printf("linkaddr=%s", ip6addr_string(&addr6));

	memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6));
	printf(" peeraddr=%s", ip6addr_string(&addr6));

	dhcp6opt_print((u_char *)(dh6relay + 1), ep);
	}
	/(/
	printf(")");
	return;

	trunc:
	printf("[\|dhcp6]");
	}