610 lines
15 KiB
C
610 lines
15 KiB
C
/*
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* Copyright (C) 1998 and 1999 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* RFC3315: DHCPv6
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* supported DHCPv6 options:
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* RFC3319,
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* draft-ietf-dhc-dhcpv6-opt-dnsconfig-04.txt,
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* draft-ietf-dhc-dhcpv6-opt-prefix-delegation-05.txt
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* draft-ietf-dhc-dhcpv6-opt-timeconfig-02.txt,
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/tcpdump/print-dhcp6.c,v 1.27.2.4 2003/11/18 23:26:14 guy Exp $";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h"
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/* lease duration */
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#define DHCP6_DURATITION_INFINITE 0xffffffff
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/* Error Values */
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#define DH6ERR_FAILURE 16
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#define DH6ERR_AUTHFAIL 17
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#define DH6ERR_POORLYFORMED 18
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#define DH6ERR_UNAVAIL 19
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#define DH6ERR_OPTUNAVAIL 20
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/* Message type */
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#define DH6_SOLICIT 1
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#define DH6_ADVERTISE 2
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#define DH6_REQUEST 3
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#define DH6_CONFIRM 4
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#define DH6_RENEW 5
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#define DH6_REBIND 6
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#define DH6_REPLY 7
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#define DH6_RELEASE 8
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#define DH6_DECLINE 9
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#define DH6_RECONFIGURE 10
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#define DH6_INFORM_REQ 11
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#define DH6_RELAY_FORW 12
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#define DH6_RELAY_REPLY 13
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/* DHCP6 base packet format */
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struct dhcp6 {
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union {
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u_int8_t m;
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u_int32_t x;
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} dh6_msgtypexid;
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/* options follow */
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};
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#define dh6_msgtype dh6_msgtypexid.m
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#define dh6_xid dh6_msgtypexid.x
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#define DH6_XIDMASK 0x00ffffff
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/* DHCPv6 relay messages */
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struct dhcp6_relay {
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u_int8_t dh6relay_msgtype;
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u_int8_t dh6relay_hcnt;
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u_int8_t dh6relay_linkaddr[16]; /* XXX: badly aligned */
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u_int8_t dh6relay_peeraddr[16];
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/* options follow */
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};
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/* options */
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#define DH6OPT_CLIENTID 1
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#define DH6OPT_SERVERID 2
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#define DH6OPT_IA_NA 3
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#define DH6OPT_IA_TMP 4
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#define DH6OPT_IADDR 5
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#define DH6OPT_ORO 6
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#define DH6OPT_PREFERENCE 7
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# define DH6OPT_PREF_UNDEF -1
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# define DH6OPT_PREF_MAX 255
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#define DH6OPT_ELAPSED_TIME 8
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#define DH6OPT_RELAY_MSG 9
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/*#define DH6OPT_SERVER_MSG 10 deprecated */
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#define DH6OPT_AUTH 11
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#define DH6OPT_UNICAST 12
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#define DH6OPT_STATUS_CODE 13
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# define DH6OPT_STCODE_SUCCESS 0
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# define DH6OPT_STCODE_UNSPECFAIL 1
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# define DH6OPT_STCODE_NOADDRAVAIL 2
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# define DH6OPT_STCODE_NOBINDING 3
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# define DH6OPT_STCODE_NOTONLINK 4
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# define DH6OPT_STCODE_USEMULTICAST 5
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# define DH6OPT_STCODE_NOPREFIXAVAIL 6
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#define DH6OPT_RAPID_COMMIT 14
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#define DH6OPT_USER_CLASS 15
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#define DH6OPT_VENDOR_CLASS 16
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#define DH6OPT_VENDOR_OPTS 17
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#define DH6OPT_INTERFACE_ID 18
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#define DH6OPT_RECONF_MSG 19
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#define DH6OPT_RECONF_ACCEPT 20
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#define DH6OPT_SIP_SERVER_D 21
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#define DH6OPT_SIP_SERVER_A 22
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#define DH6OPT_DNS 23
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#define DH6OPT_DNSNAME 24
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/*
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* The option type has not been assigned for the following options.
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* We temporarily adopt values used in the service specification document
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* (200206xx version) by NTT Communications.
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* Note that we'll change the following definitions if different type values
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* are officially assigned.
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*/
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#define DH6OPT_PREFIX_DELEGATION 30
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#define DH6OPT_PREFIX_INFORMATION 31
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#define DH6OPT_PREFIX_REQUEST 32
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/*
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* The followings are also unassigned numbers.
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* We temporarily use values as of KAME snap 20031013.
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*/
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#define DH6OPT_IA_PD 33
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#define DH6OPT_IA_PD_PREFIX 34
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#define DH6OPT_NTP_SERVERS 35
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struct dhcp6opt {
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u_int16_t dh6opt_type;
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u_int16_t dh6opt_len;
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/* type-dependent data follows */
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};
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struct dhcp6_ia {
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u_int16_t dh6opt_ia_type;
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u_int16_t dh6opt_ia_len;
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u_int32_t dh6opt_ia_iaid;
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u_int32_t dh6opt_ia_t1;
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u_int32_t dh6opt_ia_t2;
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};
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struct dhcp6_ia_prefix {
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u_int16_t dh6opt_ia_prefix_type;
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u_int16_t dh6opt_ia_prefix_len;
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u_int32_t dh6opt_ia_prefix_pltime;
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u_int32_t dh6opt_ia_prefix_vltime;
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u_int8_t dh6opt_ia_prefix_plen;
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struct in6_addr dh6opt_ia_prefix_addr;
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} __attribute__ ((__packed__));
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static const char *
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dhcp6opt_name(int type)
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{
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static char genstr[sizeof("opt_65535") + 1]; /* XXX thread unsafe */
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if (type > 65535)
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return "INVALID option";
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switch(type) {
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case DH6OPT_CLIENTID:
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return "client ID";
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case DH6OPT_SERVERID:
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return "server ID";
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case DH6OPT_IA_NA:
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return "IA_NA";
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case DH6OPT_ORO:
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return "option request";
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case DH6OPT_PREFERENCE:
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return "preference";
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case DH6OPT_ELAPSED_TIME:
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return "elapsed time";
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case DH6OPT_RELAY_MSG:
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return "relay message";
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case DH6OPT_STATUS_CODE:
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return "status code";
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case DH6OPT_RAPID_COMMIT:
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return "rapid commit";
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case DH6OPT_INTERFACE_ID:
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return "interface ID";
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case DH6OPT_RECONF_MSG:
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return "reconfigure message";
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case DH6OPT_RECONF_ACCEPT:
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return "reconfigure accept";
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case DH6OPT_SIP_SERVER_D:
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return "SIP Servers Domain";
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case DH6OPT_SIP_SERVER_A:
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return "SIP Servers Address";
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case DH6OPT_DNS:
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return "DNS";
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case DH6OPT_PREFIX_DELEGATION:
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return "prefix delegation";
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case DH6OPT_PREFIX_INFORMATION:
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return "prefix information";
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case DH6OPT_IA_PD:
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return "IA_PD";
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case DH6OPT_IA_PD_PREFIX:
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return "IA_PD prefix";
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case DH6OPT_NTP_SERVERS:
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return "NTP Server";
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default:
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snprintf(genstr, sizeof(genstr), "opt_%d", type);
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return(genstr);
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}
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}
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static const char *
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dhcp6stcode(int code)
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{
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static char genstr[sizeof("code255") + 1]; /* XXX thread unsafe */
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if (code > 255)
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return "INVALID code";
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switch(code) {
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case DH6OPT_STCODE_SUCCESS:
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return "success";
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case DH6OPT_STCODE_UNSPECFAIL:
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return "unspec failure";
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case DH6OPT_STCODE_NOADDRAVAIL:
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return "no addresses";
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case DH6OPT_STCODE_NOBINDING:
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return "no binding";
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case DH6OPT_STCODE_NOTONLINK:
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return "not on-link";
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case DH6OPT_STCODE_USEMULTICAST:
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return "use multicast";
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case DH6OPT_STCODE_NOPREFIXAVAIL:
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return "no prefixes";
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default:
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snprintf(genstr, sizeof(genstr), "code%d", code);
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return(genstr);
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}
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}
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static void
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dhcp6opt_print(const u_char *cp, const u_char *ep)
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{
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struct dhcp6opt *dh6o;
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u_char *tp;
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size_t i;
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u_int16_t opttype;
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size_t optlen;
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u_int16_t val16;
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u_int32_t val32;
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struct in6_addr addr6;
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struct dhcp6_ia ia;
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struct dhcp6_ia_prefix ia_prefix;
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if (cp == ep)
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return;
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while (cp < ep) {
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if (ep < cp + sizeof(*dh6o))
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goto trunc;
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dh6o = (struct dhcp6opt *)cp;
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optlen = EXTRACT_16BITS(&dh6o->dh6opt_len);
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if (ep < cp + sizeof(*dh6o) + optlen)
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goto trunc;
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opttype = EXTRACT_16BITS(&dh6o->dh6opt_type);
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printf(" (%s", dhcp6opt_name(opttype));
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switch (opttype) {
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case DH6OPT_CLIENTID:
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case DH6OPT_SERVERID:
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if (optlen < 2) {
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/*(*/
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printf(" ?)");
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break;
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}
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tp = (u_char *)(dh6o + 1);
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switch (EXTRACT_16BITS(tp)) {
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case 1:
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if (optlen >= 2 + 6) {
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printf(" hwaddr/time type %u time %u ",
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EXTRACT_16BITS(&tp[2]),
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EXTRACT_32BITS(&tp[4]));
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for (i = 8; i < optlen; i++)
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printf("%02x", tp[i]);
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/*(*/
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printf(")");
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} else {
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/*(*/
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printf(" ?)");
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}
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break;
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case 2:
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if (optlen >= 2 + 8) {
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printf(" vid ");
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for (i = 2; i < 2 + 8; i++)
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printf("%02x", tp[i]);
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/*(*/
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printf(")");
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} else {
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/*(*/
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printf(" ?)");
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}
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break;
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case 3:
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if (optlen >= 2 + 2) {
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printf(" hwaddr type %u ",
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EXTRACT_16BITS(&tp[2]));
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for (i = 4; i < optlen; i++)
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printf("%02x", tp[i]);
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/*(*/
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printf(")");
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} else {
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/*(*/
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printf(" ?)");
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}
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break;
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default:
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printf(" type %d)", EXTRACT_16BITS(tp));
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break;
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}
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break;
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case DH6OPT_ORO:
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if (optlen % 2) {
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printf(" ?)");
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break;
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}
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tp = (u_char *)(dh6o + 1);
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for (i = 0; i < optlen; i += 2) {
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u_int16_t opt;
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memcpy(&opt, &tp[i], sizeof(opt));
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printf(" %s", dhcp6opt_name(ntohs(opt)));
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}
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printf(")");
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break;
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case DH6OPT_PREFERENCE:
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if (optlen != 1) {
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printf(" ?)");
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break;
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}
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printf(" %d)", *((u_char *)(dh6o + 1) + 1));
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break;
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case DH6OPT_ELAPSED_TIME:
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if (optlen != 2) {
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printf(" ?)");
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break;
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}
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memcpy(&val16, dh6o + 1, sizeof(val16));
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val16 = ntohs(val16);
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printf(" %d)", (int)val16);
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break;
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case DH6OPT_RELAY_MSG:
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printf(" (");
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dhcp6_print((const u_char *)(dh6o + 1), optlen);
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printf(")");
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break;
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case DH6OPT_RAPID_COMMIT: /* nothing todo */
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printf(")");
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break;
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case DH6OPT_INTERFACE_ID:
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/*
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* Since we cannot predict the encoding, print hex dump
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* at most 10 characters.
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*/
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for (i = 0; i < optlen && i < 10; i++)
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printf("%02x", ((u_char *)(dh6o + 1))[i]);
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break;
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case DH6OPT_RECONF_MSG:
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tp = (u_char *)(dh6o + 1);
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switch (*tp) {
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case DH6_RENEW:
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printf(" for renew)");
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break;
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case DH6_INFORM_REQ:
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printf(" for inf-req)");
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break;
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default:
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printf(" for ?\?\?(%02x))", *tp);
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break;
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}
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break;
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case DH6OPT_RECONF_ACCEPT: /* nothing todo */
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printf(")");
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break;
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case DH6OPT_SIP_SERVER_A:
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case DH6OPT_DNS:
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case DH6OPT_NTP_SERVERS:
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if (optlen % 16) {
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printf(" ?)");
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break;
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}
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tp = (u_char *)(dh6o + 1);
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for (i = 0; i < optlen; i += 16)
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printf(" %s", ip6addr_string(&tp[i]));
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printf(")");
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break;
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case DH6OPT_PREFIX_DELEGATION:
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dhcp6opt_print((u_char *)(dh6o + 1),
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(u_char *)(dh6o + 1) + optlen);
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printf(")");
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break;
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case DH6OPT_PREFIX_INFORMATION:
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if (optlen % 21)
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printf(" ?)");
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memcpy(&addr6, (u_char *)(dh6o + 1) + 5,
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sizeof(addr6));
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printf(" %s/%d", ip6addr_string(&addr6),
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(int)*((u_char *)(dh6o + 1) + 4));
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memcpy(&val32, dh6o + 1, sizeof(val32));
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val32 = ntohl(val32);
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if (val32 == DHCP6_DURATITION_INFINITE)
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printf(" lease-duration: infinite)");
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else
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printf(" lease-duration: %u)", val32);
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break;
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case DH6OPT_STATUS_CODE:
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if (optlen < 2) {
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printf(" ?)");
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break;
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}
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memcpy(&val16, (u_char *)(dh6o + 1), sizeof(val16));
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val16 = ntohs(val16);
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printf(" %s)", dhcp6stcode(val16));
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break;
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case DH6OPT_IA_NA:
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case DH6OPT_IA_PD:
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if (optlen < sizeof(ia) - 4) {
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printf(" ?)");
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break;
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}
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memcpy(&ia, (u_char *)dh6o, sizeof(ia));
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ia.dh6opt_ia_iaid = ntohl(ia.dh6opt_ia_iaid);
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ia.dh6opt_ia_t1 = ntohl(ia.dh6opt_ia_t1);
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ia.dh6opt_ia_t2 = ntohl(ia.dh6opt_ia_t2);
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printf(" IAID:%lu T1:%lu T2:%lu",
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(unsigned long)ia.dh6opt_ia_iaid,
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(unsigned long)ia.dh6opt_ia_t1,
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(unsigned long)ia.dh6opt_ia_t2);
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if (optlen > sizeof(ia) - 4) {
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/* there are sub-options */
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dhcp6opt_print((u_char *)dh6o + sizeof(ia),
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(u_char *)(dh6o + 1) + optlen);
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}
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printf(")");
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break;
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case DH6OPT_IA_PD_PREFIX:
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if (optlen < sizeof(ia_prefix) - 4) {
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printf(" ?)");
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break;
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}
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memcpy(&ia_prefix, (u_char *)dh6o, sizeof(ia_prefix));
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printf(" %s/%d",
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ip6addr_string(&ia_prefix.dh6opt_ia_prefix_addr),
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ia_prefix.dh6opt_ia_prefix_plen);
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ia_prefix.dh6opt_ia_prefix_pltime =
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ntohl(ia_prefix.dh6opt_ia_prefix_pltime);
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ia_prefix.dh6opt_ia_prefix_vltime =
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ntohl(ia_prefix.dh6opt_ia_prefix_vltime);
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printf(" pltime:%lu vltime:%lu",
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(unsigned long)ia_prefix.dh6opt_ia_prefix_pltime,
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(unsigned long)ia_prefix.dh6opt_ia_prefix_vltime);
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if (optlen > sizeof(ia_prefix) - 4) {
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/* there are sub-options */
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dhcp6opt_print((u_char *)dh6o +
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sizeof(ia_prefix),
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(u_char *)(dh6o + 1) + optlen);
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}
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printf(")");
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break;
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default:
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printf(")");
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break;
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}
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cp += sizeof(*dh6o) + optlen;
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}
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return;
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trunc:
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printf("[|dhcp6ext]");
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}
|
|
|
|
/*
|
|
* 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]");
|
|
}
|