![Jörg Mayer](/assets/img/avatar_default.png)
winapi_cleanup tool written by Patrik Stridvall for the wine project. svn path=/trunk/; revision=6117
636 lines
17 KiB
C
636 lines
17 KiB
C
/* packet-dhpcv6.c
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* Routines for DHCPv6 packet disassembly
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* Jun-ichiro itojun Hagino <itojun@iijlab.net>
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* IItom Tsutomu MIENO <iitom@utouto.com>
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* SHIRASAKI Yasuhiro <yasuhiro@gnome.gr.jp>
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*
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* $Id: packet-dhcpv6.c,v 1.7 2002/08/28 21:00:12 jmayer Exp $
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*
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* The information used comes from:
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* draft-ietf-dhc-dhcpv6-26.txt
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* draft-troan-dhcpv6-opt-prefix-delegation-01.txt
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* draft-ietf-dhc-dhcpv6-opt-dnsconfig-02.txt
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*
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* Note that protocol constants are still subject to change, based on IANA
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* assignment decisions.
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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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 <string.h>
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#include <glib.h>
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#include <epan/int-64bit.h>
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#include <epan/packet.h>
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#include <epan/ipv6-utils.h>
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static int proto_dhcpv6 = -1;
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static int hf_dhcpv6_msgtype = -1;
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static guint ett_dhcpv6 = -1;
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static guint ett_dhcpv6_option = -1;
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#define UDP_PORT_DHCPV6_DOWNSTREAM 546
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#define UDP_PORT_DHCPV6_UPSTREAM 547
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#define DHCPV6_LEASEDURATION_INFINITY 0xffffffff
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#define SOLICIT 1
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#define ADVERTISE 2
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#define REQUEST 3
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#define CONFIRM 4
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#define RENEW 5
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#define REBIND 6
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#define REPLY 7
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#define RELEASE 8
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#define DECLINE 9
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#define RECONFIGURE 10
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#define INFORMATION_REQUEST 11
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#define RELAY_FORW 12
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#define RELAY_REPL 13
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#define OPTION_CLIENTID 1
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#define OPTION_SERVERID 2
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#define OPTION_IA 3
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#define OPTION_IA_TA 4
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#define OPTION_IAADDR 5
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#define OPTION_ORO 6
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#define OPTION_PREFERENCE 7
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#define OPTION_ELAPSED_TIME 8
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#define OPTION_RELAY_MSG 9
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/* #define OPTION_SERVER_MSG 10 */
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#define OPTION_AUTH 11
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#define OPTION_UNICAST 12
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#define OPTION_STATUS_CODE 13
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#define OPTION_RAPID_COMMIT 14
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#define OPTION_USER_CLASS 15
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#define OPTION_VENDOR_CLASS 16
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#define OPTION_VENDOR_OPTS 17
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#define OPTION_INTERFACE_ID 18
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#define OPTION_RECONF_MSG 19
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#define OPTION_RECONF_NONCE 20
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#define OPTION_DNS_SERVERS 25
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#define OPTION_DOMAIN_LIST 26
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#define OPTION_PREFIXDEL 30
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#define OPTION_PREFIX_INFO 31
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#define OPTION_PREFIXREQ 32
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#define DUID_LLT 1
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#define DUID_EN 2
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#define DUID_LL 3
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#define DUID_LL_OLD 4
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static const value_string msgtype_vals[] = {
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{ SOLICIT, "Solicit" },
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{ ADVERTISE, "Advertise" },
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{ REQUEST, "Request" },
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{ CONFIRM, "Confirm" },
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{ RENEW, "Renew" },
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{ REBIND, "Rebind" },
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{ REPLY, "Reply" },
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{ RELEASE, "Release" },
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{ DECLINE, "Decline" },
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{ RECONFIGURE, "Reconfigure" },
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{ INFORMATION_REQUEST, "Information-request" },
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{ RELAY_FORW, "Relay-forw" },
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{ RELAY_REPL, "Relay-repl" },
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{ 0, NULL }
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};
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static const value_string opttype_vals[] = {
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{ OPTION_CLIENTID, "Client Identifier" },
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{ OPTION_SERVERID, "Server Identifier" },
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{ OPTION_IA, "Identify Association" },
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{ OPTION_IA_TA, "Identify Association for Temporary Address" },
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{ OPTION_IAADDR, "IA Address" },
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{ OPTION_ORO, "Option Request" },
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{ OPTION_PREFERENCE, "Preference" },
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{ OPTION_ELAPSED_TIME, "Elapsed time" },
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{ OPTION_RELAY_MSG, "Relay Message" },
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/* { OPTION_SERVER_MSG, "Server message" }, */
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{ OPTION_AUTH, "Authentication" },
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{ OPTION_UNICAST, "Server unicast" },
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{ OPTION_STATUS_CODE, "Status code" },
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{ OPTION_RAPID_COMMIT, "Rapid Commit" },
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{ OPTION_USER_CLASS, "User Class" },
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{ OPTION_VENDOR_CLASS, "Vendor Class" },
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{ OPTION_VENDOR_OPTS, "Vendor-specific Information" },
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{ OPTION_INTERFACE_ID, "Interface-Id" },
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{ OPTION_RECONF_MSG, "Reconfigure Message" },
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{ OPTION_RECONF_NONCE, "Reconfigure Nonce" },
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{ OPTION_DNS_SERVERS, "Domain Name Server" },
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{ OPTION_DOMAIN_LIST, "Domain Search List" },
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{ OPTION_PREFIXDEL, "Prefix Delegation" },
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{ OPTION_PREFIX_INFO, "Prefix Information" },
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{ OPTION_PREFIXREQ, "Prefix Request" },
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{ 0, NULL }
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};
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static const value_string statuscode_vals[] =
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{
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{0, "Success" },
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{1, "UnspecFail" },
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{2, "AuthFailed" },
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{3, "AddrUnvail" },
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{4, "NoAddrAvail" },
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{5, "NoBinding" },
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{6, "ConfNoMatch" },
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{7, "NotOnLink" },
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{8, "UseMulticast" },
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{0, NULL }
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};
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static const value_string duidtype_vals[] =
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{
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{ DUID_LLT, "link-layer address plus time" },
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{ DUID_EN, "assigned by vendor based on Enterprise number" },
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{ DUID_LL, "link-layer address" },
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{ DUID_LL_OLD, "link-layer address (old)" },
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{ 0, NULL }
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};
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/* Returns the number of bytes consumed by this option. */
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static int
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dhcpv6_option(tvbuff_t *tvb, proto_tree *bp_tree, int off, int eoff,
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gboolean *at_end)
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{
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guint16 opttype;
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guint16 optlen;
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proto_item *ti;
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proto_tree *subtree;
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int i;
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struct e_in6_addr in6;
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guint16 duidtype;
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/* option type and length must be present */
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if (eoff - off < 4) {
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*at_end = TRUE;
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return 0;
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}
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opttype = tvb_get_ntohs(tvb, off);
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optlen = tvb_get_ntohs(tvb, off + 2);
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/* truncated case */
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if (eoff - off < 4 + optlen) {
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*at_end = TRUE;
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return 0;
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}
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ti = proto_tree_add_text(bp_tree, tvb, off, 4 + optlen,
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"%s", val_to_str(opttype, opttype_vals, "DHCP option %u"));
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subtree = proto_item_add_subtree(ti, ett_dhcpv6_option);
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proto_tree_add_text(subtree, tvb, off, 2, "option type: %d", opttype);
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proto_tree_add_text(subtree, tvb, off + 2, 2, "option length: %d",
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optlen);
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off += 4;
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switch (opttype) {
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case OPTION_CLIENTID:
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case OPTION_SERVERID:
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if (optlen < 2) {
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proto_tree_add_text(subtree, tvb, off, optlen,
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"DUID: malformed option");
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break;
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}
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duidtype = tvb_get_ntohs(tvb, off);
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proto_tree_add_text(subtree, tvb, off, 2,
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"DUID type: %s (%u)",
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val_to_str(duidtype,
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duidtype_vals, "Unknown"),
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duidtype);
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switch (duidtype) {
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case DUID_LLT:
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if (optlen < 8) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "DUID: malformed option");
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break;
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}
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/* XXX seconds since Jan 1 2000 */
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proto_tree_add_text(subtree, tvb, off + 2, 2,
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"Hardware type: %u",
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tvb_get_ntohs(tvb, off + 2));
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proto_tree_add_text(subtree, tvb, off + 4, 4,
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"Time: %u", tvb_get_ntohl(tvb, off + 4));
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if (optlen > 8) {
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proto_tree_add_text(subtree, tvb, off + 8,
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optlen - 8, "Link-layer address");
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}
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break;
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case DUID_EN:
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if (optlen < 6) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "DUID: malformed option");
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break;
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}
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proto_tree_add_text(subtree, tvb, off + 2, 4,
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"enterprise-number");
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if (optlen > 6) {
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proto_tree_add_text(subtree, tvb, off + 6,
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optlen - 6, "identifier");
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}
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break;
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case DUID_LL:
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case DUID_LL_OLD:
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if (optlen < 4) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "DUID: malformed option");
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break;
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}
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proto_tree_add_text(subtree, tvb, off + 2, 2,
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"Hardware type: %u",
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tvb_get_ntohs(tvb, off + 2));
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if (optlen > 4) {
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proto_tree_add_text(subtree, tvb, off + 4,
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optlen - 4, "Link-layer address");
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}
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break;
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}
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break;
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case OPTION_IA:
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if (optlen < 12) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "IA: malformed option");
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break;
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}
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proto_tree_add_text(subtree, tvb, off, 4,
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"IAID: %u",
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tvb_get_ntohl(tvb, off));
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proto_tree_add_text(subtree, tvb, off+4, 4,
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"T1: %u", tvb_get_ntohl(tvb, off+4));
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proto_tree_add_text(subtree, tvb, off+8, 4,
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"T2: %u", tvb_get_ntohl(tvb, off+8));
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if (optlen > 12) {
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gboolean at_end_;
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dhcpv6_option(tvb, subtree, off+12, off + optlen - 12, &at_end_);
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}
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break;
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case OPTION_IA_TA:
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if (optlen < 4) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "IA_TA: malformed option");
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break;
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}
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proto_tree_add_text(subtree, tvb, off, 4,
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"IAID: %u",
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tvb_get_ntohl(tvb, off));
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if (optlen > 4) {
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gboolean at_end_;
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dhcpv6_option(tvb, subtree, off+4, off + optlen - 4, &at_end_);
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}
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break;
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case OPTION_IAADDR:
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if (optlen < 24) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "IAADDR: malformed option");
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break;
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}
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tvb_memcpy(tvb, (guint8 *)&in6, off, sizeof(in6));
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proto_tree_add_text(subtree, tvb, off,
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sizeof(in6), "IPv6 address: %s",
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ip6_to_str(&in6));
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proto_tree_add_text(subtree, tvb, off+16, 4,
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"preferred-lifetime: %u",
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tvb_get_ntohl(tvb, off+16));
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proto_tree_add_text(subtree, tvb, off+20, 4,
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"valid-lifetime: %u",
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tvb_get_ntohl(tvb, off+20));
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if (optlen > 24) {
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gboolean at_end_;
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dhcpv6_option(tvb, subtree, off+24, off + optlen - 24, &at_end_);
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}
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break;
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case OPTION_ORO:
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for (i = 0; i < optlen; i += 2) {
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guint16 requested_opt_code;
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requested_opt_code = tvb_get_ntohs(tvb, off + i);
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proto_tree_add_text(subtree, tvb, off + i,
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2, "Requested Option code: %s (%d)",
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val_to_str(requested_opt_code,
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opttype_vals,
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"Unknown"),
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requested_opt_code);
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}
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break;
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case OPTION_PREFERENCE:
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if (optlen != 1) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "PREFERENCE: malformed option");
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break;
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}
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proto_tree_add_text(subtree, tvb, off, 1,
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"pref-value: %d",
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(guint32)tvb_get_guint8(tvb, off));
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break;
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case OPTION_ELAPSED_TIME:
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if (optlen != 2) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "ELAPSED-TIME: malformed option");
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break;
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}
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proto_tree_add_text(subtree, tvb, off, 2,
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"elapsed-time: %d sec",
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(guint32)tvb_get_ntohs(tvb, off));
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break;
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case OPTION_RELAY_MSG:
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if (optlen == 0) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "RELAY-MSG: malformed option");
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break;
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} else {
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gboolean at_end_;
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dhcpv6_option(tvb, subtree, off, off + optlen, &at_end_);
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}
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break;
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case OPTION_AUTH:
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if (optlen < 15) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "AUTH: malformed option");
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break;
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}
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proto_tree_add_text(subtree, tvb, off, 1,
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"Protocol: %d",
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(guint32)tvb_get_guint8(tvb, off));
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proto_tree_add_text(subtree, tvb, off+1, 1,
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"Algorithm: %d",
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(guint32)tvb_get_guint8(tvb, off+1));
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proto_tree_add_text(subtree, tvb, off+2, 1,
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"RDM: %d",
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(guint32)tvb_get_guint8(tvb, off+2));
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proto_tree_add_text(subtree, tvb, off+3, 8,
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"Reply Detection");
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proto_tree_add_text(subtree, tvb, off+11, optlen-11,
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"Authentication Information");
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break;
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case OPTION_UNICAST:
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if (optlen != 16) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "UNICAST: malformed option");
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break;
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}
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tvb_memcpy(tvb, (guint8 *)&in6, off, sizeof(in6));
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proto_tree_add_text(subtree, tvb, off,
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sizeof(in6), "IPv6 address: %s",
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ip6_to_str(&in6));
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break;
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case OPTION_STATUS_CODE:
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{
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guint16 status_code;
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char *status_message = 0;
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status_code = tvb_get_ntohs(tvb, off);
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proto_tree_add_text(subtree, tvb, off, 2,
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"Status Code: %s (%d)",
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val_to_str(status_code, statuscode_vals,
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"Unknown"),
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status_code);
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if (optlen - 2 > 0)
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status_message = g_malloc(optlen - 2 + 1);
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if (status_message != 0){
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memset(status_message, 0, optlen - 2 + 1);
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status_message = tvb_memcpy(tvb, status_message, off + 2,
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optlen - 2);
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proto_tree_add_text(subtree, tvb, off + 2, optlen - 2,
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"Status Message: %s",
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status_message);
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g_free(status_message);
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}
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}
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break;
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case OPTION_VENDOR_CLASS:
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if (optlen < 4) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "VENDOR_CLASS: malformed option");
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break;
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}
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proto_tree_add_text(subtree, tvb, off, 4,
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"enterprise-number: %u",
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tvb_get_ntohl(tvb, off));
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if (optlen > 4) {
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proto_tree_add_text(subtree, tvb, off+4, optlen-4,
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"vendor-class-data");
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}
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break;
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case OPTION_VENDOR_OPTS:
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if (optlen < 4) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "VENDOR_OPTS: malformed option");
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break;
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}
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proto_tree_add_text(subtree, tvb, off, 4,
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"enterprise-number: %u",
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tvb_get_ntohl(tvb, off));
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if (optlen > 4) {
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proto_tree_add_text(subtree, tvb, off+4, optlen-4,
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"option-data");
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}
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break;
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case OPTION_INTERFACE_ID:
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if (optlen == 0) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "INTERFACE_ID: malformed option");
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break;
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}
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proto_tree_add_text(subtree, tvb, off, optlen, "Interface-ID");
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break;
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case OPTION_RECONF_MSG:
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if (optlen != 1) {
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proto_tree_add_text(subtree, tvb, off,
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optlen, "RECONF_MSG: malformed option");
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break;
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}
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proto_tree_add_text(subtree, tvb, off, optlen,
|
|
"Reconfigure-type: %s",
|
|
val_to_str(tvb_get_guint8(tvb, off),
|
|
msgtype_vals,
|
|
"Message Type %u"));
|
|
break;
|
|
case OPTION_RECONF_NONCE:
|
|
if (optlen != 8) {
|
|
proto_tree_add_text(subtree, tvb, off,
|
|
optlen, "RECONF_NONCE: malformed option");
|
|
break;
|
|
}
|
|
proto_tree_add_text(subtree, tvb, off, optlen,
|
|
"Reconfigure-nonce");
|
|
break;
|
|
case OPTION_DNS_SERVERS:
|
|
if (optlen % 16) {
|
|
proto_tree_add_text(subtree, tvb, off, optlen,
|
|
"DNS servers address: malformed option");
|
|
break;
|
|
}
|
|
for (i = 0; i < optlen; i += 16) {
|
|
tvb_memcpy(tvb, (guint8 *)&in6, off + i, sizeof(in6));
|
|
proto_tree_add_text(subtree, tvb, off + i,
|
|
sizeof(in6), "DNS servers address: %s",
|
|
ip6_to_str(&in6));
|
|
}
|
|
break;
|
|
case OPTION_DOMAIN_LIST:
|
|
if (optlen > 0) {
|
|
proto_tree_add_text(subtree, tvb, off, optlen, "Search String");
|
|
}
|
|
break;
|
|
case OPTION_PREFIXDEL:
|
|
{
|
|
gboolean at_end_;
|
|
dhcpv6_option(tvb, subtree, off, off + optlen, &at_end_);
|
|
}
|
|
break;
|
|
case OPTION_PREFIX_INFO:
|
|
{
|
|
guint32 lease_duration;
|
|
guint8 prefix_length;
|
|
struct e_in6_addr in6;
|
|
|
|
lease_duration = tvb_get_ntohl(tvb, off);
|
|
prefix_length = tvb_get_guint8(tvb, off + 4);
|
|
if ( lease_duration == DHCPV6_LEASEDURATION_INFINITY) {
|
|
proto_tree_add_text(subtree, tvb, off, 4,
|
|
"Lease duration: infinity");
|
|
} else {
|
|
proto_tree_add_text(subtree, tvb, off, 4,
|
|
"Lease duration: %u", lease_duration);
|
|
}
|
|
proto_tree_add_text(subtree, tvb, off + 4, 1,
|
|
"Prefix length: %d", prefix_length);
|
|
tvb_memcpy(tvb, (guint8 *)&in6, off + 5 , sizeof(in6));
|
|
proto_tree_add_text(subtree, tvb, off + 5,
|
|
16, "Prefix address: %s",
|
|
ip6_to_str(&in6));
|
|
}
|
|
break;
|
|
case OPTION_PREFIXREQ:
|
|
{
|
|
guint8 prefix_length;
|
|
prefix_length = tvb_get_guint8(tvb, off);
|
|
proto_tree_add_text(subtree, tvb, off, 1,
|
|
"Prefix length: %d", prefix_length);
|
|
}
|
|
break;
|
|
}
|
|
|
|
|
|
return 4 + optlen;
|
|
}
|
|
|
|
|
|
static void
|
|
dissect_dhcpv6(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
|
gboolean downstream)
|
|
{
|
|
proto_tree *bp_tree = NULL;
|
|
proto_item *ti;
|
|
guint8 msgtype;
|
|
guint32 xid;
|
|
int off, eoff;
|
|
gboolean at_end;
|
|
|
|
downstream = 0; /* feature reserved */
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DHCPv6");
|
|
if (check_col(pinfo->cinfo, COL_INFO))
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
msgtype = tvb_get_guint8(tvb, 0);
|
|
|
|
/* XXX relay agent messages have to be decoded differently */
|
|
|
|
xid = tvb_get_ntohl(tvb, 0) & 0x00ffffff;
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_set_str(pinfo->cinfo, COL_INFO,
|
|
val_to_str(msgtype,
|
|
msgtype_vals,
|
|
"Message Type %u"));
|
|
}
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_dhcpv6, tvb, 0, -1, FALSE);
|
|
bp_tree = proto_item_add_subtree(ti, ett_dhcpv6);
|
|
|
|
proto_tree_add_uint(bp_tree, hf_dhcpv6_msgtype, tvb, 0, 1,
|
|
msgtype);
|
|
proto_tree_add_text(bp_tree, tvb, 1, 3, "Transaction-ID: 0x%08x", xid);
|
|
#if 0
|
|
tvb_memcpy(tvb, (guint8 *)&in6, 4, sizeof(in6));
|
|
proto_tree_add_text(bp_tree, tvb, 4, sizeof(in6),
|
|
"Server address: %s", ip6_to_str(&in6));
|
|
#endif
|
|
}
|
|
|
|
off = 4;
|
|
eoff = tvb_reported_length(tvb);
|
|
|
|
at_end = FALSE;
|
|
while (off < eoff && !at_end)
|
|
off += dhcpv6_option(tvb, bp_tree, off, eoff, &at_end);
|
|
}
|
|
|
|
static void
|
|
dissect_dhcpv6_downstream(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
dissect_dhcpv6(tvb, pinfo, tree, TRUE);
|
|
}
|
|
|
|
static void
|
|
dissect_dhcpv6_upstream(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
dissect_dhcpv6(tvb, pinfo, tree, FALSE);
|
|
}
|
|
|
|
|
|
void
|
|
proto_register_dhcpv6(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_dhcpv6_msgtype,
|
|
{ "Message type", "dhcpv6.msgtype", FT_UINT8,
|
|
BASE_DEC, VALS(msgtype_vals), 0x0,
|
|
"", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_dhcpv6,
|
|
&ett_dhcpv6_option,
|
|
};
|
|
|
|
proto_dhcpv6 = proto_register_protocol("DHCPv6", "DHCPv6", "dhcpv6");
|
|
proto_register_field_array(proto_dhcpv6, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_dhcpv6(void)
|
|
{
|
|
dissector_handle_t dhcpv6_handle;
|
|
|
|
dhcpv6_handle = create_dissector_handle(dissect_dhcpv6_downstream,
|
|
proto_dhcpv6);
|
|
dissector_add("udp.port", UDP_PORT_DHCPV6_DOWNSTREAM, dhcpv6_handle);
|
|
dhcpv6_handle = create_dissector_handle(dissect_dhcpv6_upstream,
|
|
proto_dhcpv6);
|
|
dissector_add("udp.port", UDP_PORT_DHCPV6_UPSTREAM, dhcpv6_handle);
|
|
}
|