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wireshark/packet-dhcpv6.c

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