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phunix/external/bsd/tcpdump/dist/print-dhcp6.c
David van Moolenbroek b636d99d91 Import NetBSD tcpdump(8) 
For now, printing of Sun RPC requests is disabled because we do not
yet have the RPC header files.  This should affect basically noone,
as we do not have any RPC-based programs yet, for the same reason.

Change-Id: Ie7818faaaacdc104d8b2c37a68866b4ce18247d6
2017-03-21 22:00:21 +00:00

816 lines
22 KiB
C
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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: Session Initiation Protocol (SIP) Servers options,
* RFC3633: IPv6 Prefix options,
* RFC3646: DNS Configuration options,
* RFC3898: Network Information Service (NIS) Configuration options,
* RFC4075: Simple Network Time Protocol (SNTP) Configuration option,
* RFC4242: Information Refresh Time option,
* RFC4280: Broadcast and Multicast Control Servers options,
* RFC5908: Network Time Protocol (NTP) Server Option for DHCPv6
* RFC6334: Dual-Stack Lite option,
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: print-dhcp6.c,v 1.5 2014/11/20 03:05:03 christos Exp $");
#endif
#define NETDISSECT_REWORKED
#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_DURATION_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
static const struct tok dh6_msgtype_str[] = {
{ DH6_SOLICIT, "solicit" },
{ DH6_ADVERTISE, "advertise" },
{ DH6_REQUEST, "request" },
{ DH6_CONFIRM, "confirm" },
{ DH6_RENEW, "renew" },
{ DH6_REBIND, "rebind" },
{ DH6_REPLY, "reply" },
{ DH6_RELEASE, "release" },
{ DH6_DECLINE, "decline" },
{ DH6_RECONFIGURE, "reconfigure" },
{ DH6_INFORM_REQ, "inf-req" },
{ DH6_RELAY_FORW, "relay-fwd" },
{ DH6_RELAY_REPLY, "relay-reply" },
{ DH6_LEASEQUERY, "leasequery" },
{ DH6_LQ_REPLY, "leasequery-reply" },
{ 0, NULL }
};
/* DHCP6 base packet format */
struct dhcp6 {
union {
uint8_t m;
uint32_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 {
uint8_t dh6relay_msgtype;
uint8_t dh6relay_hcnt;
uint8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */
uint8_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_SERVERS 23
#define DH6OPT_DOMAIN_LIST 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_SNTP_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
#define DH6OPT_NTP_SERVER 56
# define DH6OPT_NTP_SUBOPTION_SRV_ADDR 1
# define DH6OPT_NTP_SUBOPTION_MC_ADDR 2
# define DH6OPT_NTP_SUBOPTION_SRV_FQDN 3
#define DH6OPT_AFTR_NAME 64
static const struct tok dh6opt_str[] = {
{ DH6OPT_CLIENTID, "client-ID" },
{ DH6OPT_SERVERID, "server-ID" },
{ DH6OPT_IA_NA, "IA_NA" },
{ DH6OPT_IA_TA, "IA_TA" },
{ DH6OPT_IA_ADDR, "IA_ADDR" },
{ DH6OPT_ORO, "option-request" },
{ DH6OPT_PREFERENCE, "preference" },
{ DH6OPT_ELAPSED_TIME, "elapsed-time" },
{ DH6OPT_RELAY_MSG, "relay-message" },
{ DH6OPT_AUTH, "authentication" },
{ DH6OPT_UNICAST, "server-unicast" },
{ DH6OPT_STATUS_CODE, "status-code" },
{ DH6OPT_RAPID_COMMIT, "rapid-commit" },
{ DH6OPT_USER_CLASS, "user-class" },
{ DH6OPT_VENDOR_CLASS, "vendor-class" },
{ DH6OPT_VENDOR_OPTS, "vendor-specific-info" },
{ DH6OPT_INTERFACE_ID, "interface-ID" },
{ DH6OPT_RECONF_MSG, "reconfigure-message" },
{ DH6OPT_RECONF_ACCEPT, "reconfigure-accept" },
{ DH6OPT_SIP_SERVER_D, "SIP-servers-domain" },
{ DH6OPT_SIP_SERVER_A, "SIP-servers-address" },
{ DH6OPT_DNS_SERVERS, "DNS-server" },
{ DH6OPT_DOMAIN_LIST, "DNS-search-list" },
{ DH6OPT_IA_PD, "IA_PD" },
{ DH6OPT_IA_PD_PREFIX, "IA_PD-prefix" },
{ DH6OPT_SNTP_SERVERS, "SNTP-servers" },
{ DH6OPT_LIFETIME, "lifetime" },
{ DH6OPT_NIS_SERVERS, "NIS-server" },
{ DH6OPT_NISP_SERVERS, "NIS+-server" },
{ DH6OPT_NIS_NAME, "NIS-domain-name" },
{ DH6OPT_NISP_NAME, "NIS+-domain-name" },
{ DH6OPT_BCMCS_SERVER_D, "BCMCS-domain-name" },
{ DH6OPT_BCMCS_SERVER_A, "BCMCS-server" },
{ DH6OPT_GEOCONF_CIVIC, "Geoconf-Civic" },
{ DH6OPT_REMOTE_ID, "Remote-ID" },
{ DH6OPT_SUBSCRIBER_ID, "Subscriber-ID" },
{ DH6OPT_CLIENT_FQDN, "Client-FQDN" },
{ DH6OPT_PANA_AGENT, "PANA-agent" },
{ DH6OPT_NEW_POSIX_TIMEZONE, "POSIX-timezone" },
{ DH6OPT_NEW_TZDB_TIMEZONE, "POSIX-tz-database" },
{ DH6OPT_ERO, "Echo-request-option" },
{ DH6OPT_LQ_QUERY, "Lease-query" },
{ DH6OPT_CLIENT_DATA, "LQ-client-data" },
{ DH6OPT_CLT_TIME, "Clt-time" },
{ DH6OPT_LQ_RELAY_DATA, "LQ-relay-data" },
{ DH6OPT_LQ_CLIENT_LINK, "LQ-client-link" },
{ DH6OPT_NTP_SERVER, "NTP-server" },
{ DH6OPT_AFTR_NAME, "AFTR-Name" },
{ 0, NULL }
};
static const struct tok dh6opt_stcode_str[] = {
{ DH6OPT_STCODE_SUCCESS, "success" },
{ DH6OPT_STCODE_UNSPECFAIL, "unspec failure" },
{ DH6OPT_STCODE_NOADDRAVAIL, "no addresses" },
{ DH6OPT_STCODE_NOBINDING, "no binding" },
{ DH6OPT_STCODE_NOTONLINK, "not on-link" },
{ DH6OPT_STCODE_USEMULTICAST, "use multicast" },
{ DH6OPT_STCODE_NOPREFIXAVAIL, "no prefixes" },
{ DH6OPT_STCODE_UNKNOWNQUERYTYPE, "unknown query type" },
{ DH6OPT_STCODE_MALFORMEDQUERY, "malformed query" },
{ DH6OPT_STCODE_NOTCONFIGURED, "not configured" },
{ DH6OPT_STCODE_NOTALLOWED, "not allowed" },
{ 0, NULL }
};
struct dhcp6opt {
uint16_t dh6opt_type;
uint16_t dh6opt_len;
/* type-dependent data follows */
};
static const char *
dhcp6stcode(const uint16_t code)
{
return code > 255 ? "INVALID code" : tok2str(dh6opt_stcode_str, "code%u", code);
}
static void
dhcp6opt_print(netdissect_options *ndo,
const u_char *cp, const u_char *ep)
{
const struct dhcp6opt *dh6o;
const u_char *tp;
size_t i;
uint16_t opttype;
size_t optlen;
uint8_t auth_proto;
u_int authinfolen, authrealmlen;
int remain_len; /* Length of remaining options */
int label_len; /* Label length */
uint16_t subopt_code;
uint16_t subopt_len;
if (cp == ep)
return;
while (cp < ep) {
if (ep < cp + sizeof(*dh6o))
goto trunc;
dh6o = (struct dhcp6opt *)cp;
ND_TCHECK(*dh6o);
optlen = EXTRACT_16BITS(&dh6o->dh6opt_len);
if (ep < cp + sizeof(*dh6o) + optlen)
goto trunc;
opttype = EXTRACT_16BITS(&dh6o->dh6opt_type);
ND_PRINT((ndo, " (%s", tok2str(dh6opt_str, "opt_%u", opttype)));
switch (opttype) {
case DH6OPT_CLIENTID:
case DH6OPT_SERVERID:
if (optlen < 2) {
/*(*/
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
switch (EXTRACT_16BITS(tp)) {
case 1:
if (optlen >= 2 + 6) {
ND_PRINT((ndo, " hwaddr/time type %u time %u ",
EXTRACT_16BITS(&tp[2]),
EXTRACT_32BITS(&tp[4])));
for (i = 8; i < optlen; i++)
ND_PRINT((ndo, "%02x", tp[i]));
/*(*/
ND_PRINT((ndo, ")"));
} else {
/*(*/
ND_PRINT((ndo, " ?)"));
}
break;
case 2:
if (optlen >= 2 + 8) {
ND_PRINT((ndo, " vid "));
for (i = 2; i < 2 + 8; i++)
ND_PRINT((ndo, "%02x", tp[i]));
/*(*/
ND_PRINT((ndo, ")"));
} else {
/*(*/
ND_PRINT((ndo, " ?)"));
}
break;
case 3:
if (optlen >= 2 + 2) {
ND_PRINT((ndo, " hwaddr type %u ",
EXTRACT_16BITS(&tp[2])));
for (i = 4; i < optlen; i++)
ND_PRINT((ndo, "%02x", tp[i]));
/*(*/
ND_PRINT((ndo, ")"));
} else {
/*(*/
ND_PRINT((ndo, " ?)"));
}
break;
default:
ND_PRINT((ndo, " type %d)", EXTRACT_16BITS(tp)));
break;
}
break;
case DH6OPT_IA_ADDR:
if (optlen < 24) {
/*(*/
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0])));
ND_PRINT((ndo, " pltime:%u vltime:%u",
EXTRACT_32BITS(&tp[16]),
EXTRACT_32BITS(&tp[20])));
if (optlen > 24) {
/* there are sub-options */
dhcp6opt_print(ndo, tp + 24, tp + optlen);
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_ORO:
case DH6OPT_ERO:
if (optlen % 2) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
for (i = 0; i < optlen; i += 2) {
ND_PRINT((ndo, " %s",
tok2str(dh6opt_str, "opt_%u", EXTRACT_16BITS(&tp[i]))));
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_PREFERENCE:
if (optlen != 1) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
ND_PRINT((ndo, " %d)", *tp));
break;
case DH6OPT_ELAPSED_TIME:
if (optlen != 2) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
ND_PRINT((ndo, " %d)", EXTRACT_16BITS(tp)));
break;
case DH6OPT_RELAY_MSG:
ND_PRINT((ndo, " ("));
tp = (u_char *)(dh6o + 1);
dhcp6_print(ndo, tp, optlen);
ND_PRINT((ndo, ")"));
break;
case DH6OPT_AUTH:
if (optlen < 11) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
auth_proto = *tp;
switch (auth_proto) {
case DH6OPT_AUTHPROTO_DELAYED:
ND_PRINT((ndo, " proto: delayed"));
break;
case DH6OPT_AUTHPROTO_RECONFIG:
ND_PRINT((ndo, " proto: reconfigure"));
break;
default:
ND_PRINT((ndo, " proto: %d", auth_proto));
break;
}
tp++;
switch (*tp) {
case DH6OPT_AUTHALG_HMACMD5:
/* XXX: may depend on the protocol */
ND_PRINT((ndo, ", alg: HMAC-MD5"));
break;
default:
ND_PRINT((ndo, ", alg: %d", *tp));
break;
}
tp++;
switch (*tp) {
case DH6OPT_AUTHRDM_MONOCOUNTER:
ND_PRINT((ndo, ", RDM: mono"));
break;
default:
ND_PRINT((ndo, ", RDM: %d", *tp));
break;
}
tp++;
ND_PRINT((ndo, ", RD:"));
for (i = 0; i < 4; i++, tp += 2)
ND_PRINT((ndo, " %04x", EXTRACT_16BITS(tp)));
/* protocol dependent part */
authinfolen = optlen - 11;
switch (auth_proto) {
case DH6OPT_AUTHPROTO_DELAYED:
if (authinfolen == 0)
break;
if (authinfolen < 20) {
ND_PRINT((ndo, " ??"));
break;
}
authrealmlen = authinfolen - 20;
if (authrealmlen > 0) {
ND_PRINT((ndo, ", realm: "));
}
for (i = 0; i < authrealmlen; i++, tp++)
ND_PRINT((ndo, "%02x", *tp));
ND_PRINT((ndo, ", key ID: %08x", EXTRACT_32BITS(tp)));
tp += 4;
ND_PRINT((ndo, ", HMAC-MD5:"));
for (i = 0; i < 4; i++, tp+= 4)
ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tp)));
break;
case DH6OPT_AUTHPROTO_RECONFIG:
if (authinfolen != 17) {
ND_PRINT((ndo, " ??"));
break;
}
switch (*tp++) {
case DH6OPT_AUTHRECONFIG_KEY:
ND_PRINT((ndo, " reconfig-key"));
break;
case DH6OPT_AUTHRECONFIG_HMACMD5:
ND_PRINT((ndo, " type: HMAC-MD5"));
break;
default:
ND_PRINT((ndo, " type: ??"));
break;
}
ND_PRINT((ndo, " value:"));
for (i = 0; i < 4; i++, tp+= 4)
ND_PRINT((ndo, " %08x", EXTRACT_32BITS(tp)));
break;
default:
ND_PRINT((ndo, " ??"));
break;
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_RAPID_COMMIT: /* nothing todo */
ND_PRINT((ndo, ")"));
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);
ND_PRINT((ndo, " "));
for (i = 0; i < optlen && i < 10; i++)
ND_PRINT((ndo, "%02x", tp[i]));
ND_PRINT((ndo, "...)"));
break;
case DH6OPT_RECONF_MSG:
tp = (u_char *)(dh6o + 1);
switch (*tp) {
case DH6_RENEW:
ND_PRINT((ndo, " for renew)"));
break;
case DH6_INFORM_REQ:
ND_PRINT((ndo, " for inf-req)"));
break;
default:
ND_PRINT((ndo, " for ?\?\?(%02x))", *tp));
break;
}
break;
case DH6OPT_RECONF_ACCEPT: /* nothing todo */
ND_PRINT((ndo, ")"));
break;
case DH6OPT_SIP_SERVER_A:
case DH6OPT_DNS_SERVERS:
case DH6OPT_SNTP_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) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
for (i = 0; i < optlen; i += 16)
ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[i])));
ND_PRINT((ndo, ")"));
break;
case DH6OPT_SIP_SERVER_D:
case DH6OPT_DOMAIN_LIST:
tp = (u_char *)(dh6o + 1);
while (tp < cp + sizeof(*dh6o) + optlen) {
ND_PRINT((ndo, " "));
if ((tp = ns_nprint(ndo, tp, cp + sizeof(*dh6o) + optlen)) == NULL)
goto trunc;
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_STATUS_CODE:
if (optlen < 2) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
ND_PRINT((ndo, " %s)", dhcp6stcode(EXTRACT_16BITS(&tp[0]))));
break;
case DH6OPT_IA_NA:
case DH6OPT_IA_PD:
if (optlen < 12) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
ND_PRINT((ndo, " 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(ndo, tp + 12, tp + optlen);
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_IA_TA:
if (optlen < 4) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
ND_PRINT((ndo, " IAID:%u", EXTRACT_32BITS(tp)));
if (optlen > 4) {
/* there are sub-options */
dhcp6opt_print(ndo, tp + 4, tp + optlen);
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_IA_PD_PREFIX:
if (optlen < 25) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
ND_PRINT((ndo, " %s/%d", ip6addr_string(ndo, &tp[9]), tp[8]));
ND_PRINT((ndo, " pltime:%u vltime:%u",
EXTRACT_32BITS(&tp[0]),
EXTRACT_32BITS(&tp[4])));
if (optlen > 25) {
/* there are sub-options */
dhcp6opt_print(ndo, tp + 25, tp + optlen);
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_LIFETIME:
case DH6OPT_CLT_TIME:
if (optlen != 4) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
ND_PRINT((ndo, " %d)", EXTRACT_32BITS(tp)));
break;
case DH6OPT_REMOTE_ID:
if (optlen < 4) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
ND_PRINT((ndo, " %d ", EXTRACT_32BITS(tp)));
/*
* Print hex dump first 10 characters.
*/
for (i = 4; i < optlen && i < 14; i++)
ND_PRINT((ndo, "%02x", tp[i]));
ND_PRINT((ndo, "...)"));
break;
case DH6OPT_LQ_QUERY:
if (optlen < 17) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
switch (*tp) {
case 1:
ND_PRINT((ndo, " by-address"));
break;
case 2:
ND_PRINT((ndo, " by-clientID"));
break;
default:
ND_PRINT((ndo, " type_%d", (int)*tp));
break;
}
ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[1])));
if (optlen > 17) {
/* there are query-options */
dhcp6opt_print(ndo, tp + 17, tp + optlen);
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_CLIENT_DATA:
tp = (u_char *)(dh6o + 1);
if (optlen > 0) {
/* there are encapsulated options */
dhcp6opt_print(ndo, tp, tp + optlen);
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_LQ_RELAY_DATA:
if (optlen < 16) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
ND_PRINT((ndo, " %s ", ip6addr_string(ndo, &tp[0])));
/*
* Print hex dump first 10 characters.
*/
for (i = 16; i < optlen && i < 26; i++)
ND_PRINT((ndo, "%02x", tp[i]));
ND_PRINT((ndo, "...)"));
break;
case DH6OPT_NTP_SERVER:
if (optlen < 4) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
while (tp < cp + sizeof(*dh6o) + optlen - 4) {
subopt_code = EXTRACT_16BITS(tp);
tp += 2;
subopt_len = EXTRACT_16BITS(tp);
tp += 2;
if (tp + subopt_len > cp + sizeof(*dh6o) + optlen)
goto trunc;
ND_PRINT((ndo, " subopt:%d", subopt_code));
switch (subopt_code) {
case DH6OPT_NTP_SUBOPTION_SRV_ADDR:
case DH6OPT_NTP_SUBOPTION_MC_ADDR:
if (subopt_len != 16) {
ND_PRINT((ndo, " ?"));
break;
}
ND_PRINT((ndo, " %s", ip6addr_string(ndo, &tp[0])));
break;
case DH6OPT_NTP_SUBOPTION_SRV_FQDN:
ND_PRINT((ndo, " "));
if (ns_nprint(ndo, tp, tp + subopt_len) == NULL)
goto trunc;
break;
default:
ND_PRINT((ndo, " ?"));
break;
}
tp += subopt_len;
}
ND_PRINT((ndo, ")"));
break;
case DH6OPT_AFTR_NAME:
if (optlen < 3) {
ND_PRINT((ndo, " ?)"));
break;
}
tp = (u_char *)(dh6o + 1);
remain_len = optlen;
ND_PRINT((ndo, " "));
/* Encoding is described in section 3.1 of RFC 1035 */
while (remain_len && *tp) {
label_len = *tp++;
if (label_len < remain_len - 1) {
ND_PRINT((ndo, "%.*s", label_len, tp));
tp += label_len;
remain_len -= (label_len + 1);
if(*tp) ND_PRINT((ndo, "."));
} else {
ND_PRINT((ndo, " ?"));
break;
}
}
ND_PRINT((ndo, ")"));
break;
default:
ND_PRINT((ndo, ")"));
break;
}
cp += sizeof(*dh6o) + optlen;
}
return;
trunc:
ND_PRINT((ndo, "[|dhcp6ext]"));
}
/*
* Print dhcp6 packets
*/
void
dhcp6_print(netdissect_options *ndo,
const u_char *cp, u_int length)
{
struct dhcp6 *dh6;
struct dhcp6_relay *dh6relay;
const u_char *ep;
u_char *extp;
const char *name;
ND_PRINT((ndo, "dhcp6"));
ep = (u_char *)ndo->ndo_snapend;
if (cp + length < ep)
ep = cp + length;
dh6 = (struct dhcp6 *)cp;
dh6relay = (struct dhcp6_relay *)cp;
ND_TCHECK(dh6->dh6_xid);
name = tok2str(dh6_msgtype_str, "msgtype-%u", dh6->dh6_msgtype);
if (!ndo->ndo_vflag) {
ND_PRINT((ndo, " %s", name));
return;
}
/* XXX relay agent messages have to be handled differently */
ND_PRINT((ndo, " %s (", name)); /*)*/
if (dh6->dh6_msgtype != DH6_RELAY_FORW &&
dh6->dh6_msgtype != DH6_RELAY_REPLY) {
ND_PRINT((ndo, "xid=%x", EXTRACT_32BITS(&dh6->dh6_xid) & DH6_XIDMASK));
extp = (u_char *)(dh6 + 1);
dhcp6opt_print(ndo, extp, ep);
} else { /* relay messages */
struct in6_addr addr6;
ND_TCHECK(dh6relay->dh6relay_peeraddr);
memcpy(&addr6, dh6relay->dh6relay_linkaddr, sizeof (addr6));
ND_PRINT((ndo, "linkaddr=%s", ip6addr_string(ndo, &addr6)));
memcpy(&addr6, dh6relay->dh6relay_peeraddr, sizeof (addr6));
ND_PRINT((ndo, " peeraddr=%s", ip6addr_string(ndo, &addr6)));
dhcp6opt_print(ndo, (u_char *)(dh6relay + 1), ep);
}
/*(*/
ND_PRINT((ndo, ")"));
return;
trunc:
ND_PRINT((ndo, "[|dhcp6]"));
}
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