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/*
* 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 1.37 2008-02-06 10:26:09 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
#define DH6_LEASEQUERY 14
#define DH6_LQ_REPLY 15

/* 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_STCODE_UNKNOWNQUERYTYPE 7
# define DH6OPT_STCODE_MALFORMEDQUERY 8
# define DH6OPT_STCODE_NOTCONFIGURED 9
# define DH6OPT_STCODE_NOTALLOWED 10
#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
#define DH6OPT_PANA_AGENT 40
#define DH6OPT_NEW_POSIX_TIMEZONE 41
#define DH6OPT_NEW_TZDB_TIMEZONE 42
#define DH6OPT_ERO 43
#define DH6OPT_LQ_QUERY 44
#define DH6OPT_CLIENT_DATA 45
#define DH6OPT_CLT_TIME 46
#define DH6OPT_LQ_RELAY_DATA 47
#define DH6OPT_LQ_CLIENT_LINK 48

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

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-server";
case DH6OPT_DNSNAME:
return "DNS-search-list";
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";
case DH6OPT_PANA_AGENT:
return "PANA-agent";
case DH6OPT_NEW_POSIX_TIMEZONE:
return "POSIX-timezone";
case DH6OPT_NEW_TZDB_TIMEZONE:
return "POSIX-tz-database";
case DH6OPT_ERO:
return "Echo-request-option";
case DH6OPT_LQ_QUERY:
return "Lease-query";
case DH6OPT_CLIENT_DATA:
return "LQ-client-data";
case DH6OPT_CLT_TIME:
return "Clt-time";
case DH6OPT_LQ_RELAY_DATA:
return "LQ-relay-data";
case DH6OPT_LQ_CLIENT_LINK:
return "LQ-client-link";
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";
case DH6OPT_STCODE_UNKNOWNQUERYTYPE:
return "unknown query type";
case DH6OPT_STCODE_MALFORMEDQUERY:
return "malformed query";
case DH6OPT_STCODE_NOTCONFIGURED:
return "not configured";
case DH6OPT_STCODE_NOTALLOWED:
return "not allowed";
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_int8_t auth_proto;
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 < 24) {
/*(*/
printf(" ?)");
break;
}
tp = (u_char *)(dh6o + 1);
printf(" %s", ip6addr_string(&tp[0]));
printf(" pltime:%u vltime:%u",
EXTRACT_32BITS(&tp[16]),
EXTRACT_32BITS(&tp[20]));
if (optlen > 24) {
/* there are sub-options */
dhcp6opt_print(tp + 24, tp + 24 + optlen);
}
printf(")");
break;
case DH6OPT_ORO:
case DH6OPT_ERO:
if (optlen % 2) {
printf(" ?)");
break;
}
tp = (u_char *)(dh6o + 1);
for (i = 0; i < optlen; i += 2) {
printf(" %s",
dhcp6opt_name(EXTRACT_16BITS(&tp[i])));
}
printf(")");
break;
case DH6OPT_PREFERENCE:
if (optlen != 1) {
printf(" ?)");
break;
}
tp = (u_char *)(dh6o + 1);
printf(" %d)", *tp);
break;
case DH6OPT_ELAPSED_TIME:
if (optlen != 2) {
printf(" ?)");
break;
}
tp = (u_char *)(dh6o + 1);
printf(" %d)", EXTRACT_16BITS(tp));
break;
case DH6OPT_RELAY_MSG:
printf(" (");
tp = (u_char *)(dh6o + 1);
dhcp6_print(tp, optlen);
printf(")");
break;
case DH6OPT_AUTH:
if (optlen < 11) {
printf(" ?)");
break;
}
tp = (u_char *)(dh6o + 1);
auth_proto = *tp;
switch (auth_proto) {
case DH6OPT_AUTHPROTO_DELAYED:
printf(" proto: delayed");
break;
case DH6OPT_AUTHPROTO_RECONFIG:
printf(" proto: reconfigure");
break;
default:
printf(" proto: %d", auth_proto);
break;
}
tp++;
switch (*tp) {
case DH6OPT_AUTHALG_HMACMD5:
/* XXX: may depend on the protocol */
printf(", alg: HMAC-MD5");
break;
default:
printf(", alg: %d", *tp);
break;
}
tp++;
switch (*tp) {
case DH6OPT_AUTHRDM_MONOCOUNTER:
printf(", RDM: mono");
break;
default:
printf(", RDM: %d", *tp);
break;
}
tp++;
printf(", RD:");
for (i = 0; i < 4; i++, tp += 2)
printf(" %04x", EXTRACT_16BITS(tp));

/* protocol dependent part */
authinfolen = optlen - 11;
switch (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:
case DH6OPT_SUBSCRIBER_ID:
/*
* Since we cannot predict the encoding, print hex dump
* at most 10 characters.
*/
tp = (u_char *)(dh6o + 1);
printf(" ");
for (i = 0; i < optlen && i < 10; i++)
printf("%02x", tp[i]);
printf("...)");
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:
case DH6OPT_PANA_AGENT:
case DH6OPT_LQ_CLIENT_LINK:
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;
}
tp = (u_char *)(dh6o + 1);
printf(" %s)", dhcp6stcode(EXTRACT_16BITS(&tp[0])));
break;
case DH6OPT_IA_NA:
case DH6OPT_IA_PD:
if (optlen < 12) {
printf(" ?)");
break;
}
tp = (u_char *)(dh6o + 1);
printf(" IAID:%u T1:%u T2:%u",
EXTRACT_32BITS(&tp[0]),
EXTRACT_32BITS(&tp[4]),
EXTRACT_32BITS(&tp[8]));
if (optlen > 12) {
/* there are sub-options */
dhcp6opt_print(tp + 12, tp + 12 + optlen);
}
printf(")");
break;
case DH6OPT_IA_TA:
if (optlen < 4) {
printf(" ?)");
break;
}
tp = (u_char *)(dh6o + 1);
printf(" IAID:%u", EXTRACT_32BITS(tp));
if (optlen > 4) {
/* there are sub-options */
dhcp6opt_print(tp + 4, tp + 4 + optlen);
}
printf(")");
break;
case DH6OPT_IA_PD_PREFIX:
if (optlen < 25) {
printf(" ?)");
break;
}
tp = (u_char *)(dh6o + 1);
printf(" %s/%d", ip6addr_string(&tp[9]), tp[8]);
printf(" pltime:%u vltime:%u",
EXTRACT_32BITS(&tp[0]),
EXTRACT_32BITS(&tp[4]));
if (optlen > 25) {
/* there are sub-options */
dhcp6opt_print(tp + 25, tp + 25 + optlen);
}
printf(")");
break;
case DH6OPT_LIFETIME:
case DH6OPT_CLT_TIME:
if (optlen != 4) {
printf(" ?)");
break;
}
tp = (u_char *)(dh6o + 1);
printf(" %d)", EXTRACT_32BITS(tp));
break;
case DH6OPT_REMOTE_ID:
if (optlen < 4) {
printf(" ?)");
break;
}
tp = (u_char *)(dh6o + 1);
printf(" %d ", EXTRACT_32BITS(tp));
/*
* Print hex dump first 10 characters.
*/
for (i = 4; i < optlen && i < 14; i++)
printf("%02x", tp[i]);
printf("...)");
break;
case DH6OPT_LQ_QUERY:
if (optlen < 17) {
printf(" ?)");
break;
}
tp = (u_char *)(dh6o + 1);
switch (*tp) {
case 1:
printf(" by-address");
break;
case 2:
printf(" by-clientID");
break;
default:
printf(" type_%d", (int)*tp);
break;
}
printf(" %s", ip6addr_string(&tp[1]));
if (optlen > 17) {
/* there are query-options */
dhcp6opt_print(tp + 17, tp + optlen);
}
printf(")");
break;
case DH6OPT_CLIENT_DATA:
tp = (u_char *)(dh6o + 1);
if (optlen > 0) {
/* there are encapsulated options */
dhcp6opt_print(tp, tp + optlen);
}
printf(")");
break;
case DH6OPT_LQ_RELAY_DATA:
if (optlen < 16) {
printf(" ?)");
break;
}
tp = (u_char *)(dh6o + 1);
printf(" %s ", ip6addr_string(&tp[0]));
/*
* Print hex dump first 10 characters.
*/
for (i = 16; i < optlen && i < 26; i++)
printf("%02x", tp[i]);
printf("...)");
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;
case DH6_LEASEQUERY:
name= "leasequery";
break;
case DH6_LQ_REPLY:
name= "leasequery-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]");
}
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