2001-12-23 21:36:58 +00:00
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/* packet-mrdisc.c 2001 Ronnie Sahlberg <See AUTHORS for email>
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2001-06-27 20:19:19 +00:00
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* Routines for IGMP/MRDISC packet disassembly
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*
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2004-07-18 00:24:25 +00:00
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* $Id$
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2001-06-27 20:19:19 +00:00
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*
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2006-05-21 04:49:01 +00:00
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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2001-06-27 20:19:19 +00:00
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* Copyright 1998 Gerald Combs
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2002-08-28 21:04:11 +00:00
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*
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2001-06-27 20:19:19 +00:00
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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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2002-08-28 21:04:11 +00:00
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*
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2001-06-27 20:19:19 +00:00
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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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2002-08-28 21:04:11 +00:00
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*
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2001-06-27 20:19:19 +00:00
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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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2012-06-28 22:56:06 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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2001-06-27 20:19:19 +00:00
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*/
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/*
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MRDISC
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2002-08-28 21:04:11 +00:00
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code
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2001-06-27 20:19:19 +00:00
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2002-08-28 21:04:11 +00:00
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0x24 x
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2001-06-27 20:19:19 +00:00
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0x25 x
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0x26 x
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MRDISC : IGMP Multicast Router DISCovery
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Defined in draft-ietf-idmr-igmp-mrdisc-06.txt
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TTL==1 and IP.DST==224.0.0.2 for all packets.
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*/
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2012-09-20 02:03:38 +00:00
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#include "config.h"
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2001-06-27 20:19:19 +00:00
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#include <glib.h>
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2002-01-21 07:37:49 +00:00
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#include <epan/packet.h>
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2002-02-01 11:01:57 +00:00
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#include "packet-igmp.h"
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2001-06-27 20:19:19 +00:00
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#include "packet-mrdisc.h"
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static int proto_mrdisc = -1;
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static int hf_checksum = -1;
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static int hf_checksum_bad = -1;
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static int hf_type = -1;
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static int hf_advint = -1;
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static int hf_numopts = -1;
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static int hf_options = -1;
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static int hf_option = -1;
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static int hf_option_len = -1;
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static int hf_qi = -1;
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static int hf_rv = -1;
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static int hf_option_bytes = -1;
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static int ett_mrdisc = -1;
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static int ett_options = -1;
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#define MRDISC_MRA 0x24
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#define MRDISC_MRS 0x25
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#define MRDISC_MRT 0x26
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static const value_string mrdisc_types[] = {
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{MRDISC_MRA, "Multicast Router Advertisement"},
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{MRDISC_MRS, "Multicast Router Solicitation"},
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{MRDISC_MRT, "Multicast Router Termination"},
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{0, NULL}
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};
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#define MRDISC_QI 0x01
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#define MRDISC_RV 0x02
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static const value_string mrdisc_options[] = {
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{MRDISC_QI, "Query Interval"},
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{MRDISC_RV, "Robustness Variable"},
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{0, NULL}
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};
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static int
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dissect_mrdisc_mra(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
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{
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guint16 num;
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/* Advertising Interval */
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2011-10-06 03:35:44 +00:00
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proto_tree_add_item(parent_tree, hf_advint, tvb, offset, 1, ENC_BIG_ENDIAN);
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2001-06-27 20:19:19 +00:00
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offset += 1;
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/* checksum */
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2002-02-01 11:01:57 +00:00
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igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
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2001-06-27 20:19:19 +00:00
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offset += 2;
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/* skip unused bytes */
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offset += 2;
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/* number of options */
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num = tvb_get_ntohs(tvb, offset);
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proto_tree_add_uint(parent_tree, hf_numopts, tvb,
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offset, 2, num);
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offset += 2;
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/* process any options */
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while (num--) {
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proto_tree *tree;
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proto_item *item;
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guint8 type,len;
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int old_offset = offset;
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2002-08-28 21:04:11 +00:00
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item = proto_tree_add_item(parent_tree, hf_options,
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2011-10-04 22:44:31 +00:00
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tvb, offset, -1, ENC_NA);
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2001-06-27 20:19:19 +00:00
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tree = proto_item_add_subtree(item, ett_options);
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type = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(tree, hf_option, tvb, offset, 1, type);
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offset += 1;
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len = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(tree, hf_option_len, tvb, offset, 1, len);
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offset += 1;
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switch (type) {
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case MRDISC_QI:
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if (item) {
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proto_item_set_text(item,"Option: %s == %d",
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val_to_str(type, mrdisc_options, "unknown %x"),
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tvb_get_ntohs(tvb, offset));
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}
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2005-04-29 03:35:38 +00:00
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if (len != 2)
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THROW(ReportedBoundsError);
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2001-07-16 05:16:58 +00:00
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proto_tree_add_item(tree, hf_qi, tvb, offset, len,
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2011-10-06 03:35:44 +00:00
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ENC_BIG_ENDIAN);
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2001-06-27 20:19:19 +00:00
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offset += len;
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break;
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case MRDISC_RV:
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if (item) {
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proto_item_set_text(item,"Option: %s == %d",
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val_to_str(type, mrdisc_options, "unknown %x"),
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tvb_get_ntohs(tvb, offset));
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}
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2005-04-29 03:35:38 +00:00
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if (len != 2)
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THROW(ReportedBoundsError);
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2001-07-16 05:16:58 +00:00
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proto_tree_add_item(tree, hf_rv, tvb, offset, len,
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2011-10-06 03:35:44 +00:00
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ENC_BIG_ENDIAN);
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2001-06-27 20:19:19 +00:00
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offset += len;
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break;
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default:
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if (item) {
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proto_item_set_text(item,"Option: unknown");
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}
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2001-07-16 05:16:58 +00:00
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proto_tree_add_item(tree, hf_option_bytes,
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2011-10-04 22:44:31 +00:00
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tvb, offset, len, ENC_NA);
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2001-06-27 20:19:19 +00:00
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offset += len;
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}
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if (item) {
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proto_item_set_len(item, offset-old_offset);
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}
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}
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2002-08-28 21:04:11 +00:00
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2001-06-27 20:19:19 +00:00
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return offset;
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}
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static int
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dissect_mrdisc_mrst(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
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{
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/* skip reserved byte */
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offset += 1;
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/* checksum */
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2002-02-01 11:01:57 +00:00
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igmp_checksum(parent_tree, tvb, hf_checksum, hf_checksum_bad, pinfo, 0);
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2001-06-27 20:19:19 +00:00
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offset += 2;
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return offset;
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}
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/* This function is only called from the IGMP dissector */
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int
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dissect_mrdisc(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, int offset)
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{
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proto_tree *tree;
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proto_item *item;
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guint8 type;
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2003-11-16 23:17:27 +00:00
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if (!proto_is_protocol_enabled(find_protocol_by_id(proto_mrdisc))) {
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2001-06-27 20:19:19 +00:00
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/* we are not enabled, skip entire packet to be nice
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to the igmp layer. (so clicking on IGMP will display the data)
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*/
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return offset+tvb_length_remaining(tvb, offset);
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}
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2011-10-21 02:10:19 +00:00
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item = proto_tree_add_item(parent_tree, proto_mrdisc, tvb, offset, 0, ENC_NA);
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2001-06-27 20:19:19 +00:00
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tree = proto_item_add_subtree(item, ett_mrdisc);
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2009-08-09 07:59:51 +00:00
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MRDISC");
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2009-08-09 08:14:59 +00:00
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col_clear(pinfo->cinfo, COL_INFO);
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2001-06-27 20:19:19 +00:00
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type = tvb_get_guint8(tvb, offset);
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2013-06-14 17:49:53 +00:00
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col_add_str(pinfo->cinfo, COL_INFO,
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2007-10-23 05:50:00 +00:00
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val_to_str(type, mrdisc_types,
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2001-06-27 20:19:19 +00:00
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"Unknown Type:0x%02x"));
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/* type of command */
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proto_tree_add_uint(tree, hf_type, tvb, offset, 1, type);
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offset += 1;
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switch (type) {
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case MRDISC_MRA:
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offset = dissect_mrdisc_mra(tvb, pinfo, tree, offset);
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break;
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case MRDISC_MRS:
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case MRDISC_MRT:
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/* MRS and MRT packets looks the same */
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offset = dissect_mrdisc_mrst(tvb, pinfo, tree, offset);
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break;
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}
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return offset;
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}
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void
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proto_register_mrdisc(void)
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{
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static hf_register_info hf[] = {
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{ &hf_type,
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{ "Type", "mrdisc.type", FT_UINT8, BASE_HEX,
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VALS(mrdisc_types), 0, "MRDISC Packet Type", HFILL }},
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{ &hf_checksum,
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{ "Checksum", "mrdisc.checksum", FT_UINT16, BASE_HEX,
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NULL, 0, "MRDISC Checksum", HFILL }},
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{ &hf_checksum_bad,
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{ "Bad Checksum", "mrdisc.checksum_bad", FT_BOOLEAN, BASE_NONE,
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From Kovarththanan Rajaratnam via bug 3548:
(1) Trailing/leading spaces are removed from 'name's/'blurb's
(2) Duplicate 'blurb's are replaced with NULL
(3) Empty ("") 'blurb's are replaced with NULL
(4) BASE_NONE, NULL, 0x0 are used for 'display', 'strings' and 'bitmask' fields
for FT_NONE, FT_BYTES, FT_IPv4, FT_IPv6, FT_ABSOLUTE_TIME, FT_RELATIVE_TIME,
FT_PROTOCOL, FT_STRING and FT_STRINGZ field types
(5) Only allow non-zero value for 'display' if 'bitmask' is non-zero
svn path=/trunk/; revision=28770
2009-06-18 21:30:42 +00:00
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NULL, 0x0, "Bad MRDISC Checksum", HFILL }},
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2001-06-27 20:19:19 +00:00
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{ &hf_advint,
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{ "Advertising Interval", "mrdisc.adv_int", FT_UINT8, BASE_DEC,
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NULL, 0, "MRDISC Advertising Interval in seconds", HFILL }},
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{ &hf_numopts,
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{ "Number Of Options", "mrdisc.num_opts", FT_UINT16, BASE_DEC,
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NULL, 0, "MRDISC Number Of Options", HFILL }},
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{ &hf_options,
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{ "Options", "mrdisc.options", FT_NONE, BASE_NONE,
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NULL, 0, "MRDISC Options", HFILL }},
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{ &hf_option,
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{ "Option", "mrdisc.option", FT_UINT8, BASE_DEC,
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VALS(mrdisc_options), 0, "MRDISC Option Type", HFILL }},
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{ &hf_option_len,
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{ "Length", "mrdisc.opt_len", FT_UINT8, BASE_DEC,
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NULL, 0, "MRDISC Option Length", HFILL }},
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{ &hf_qi,
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{ "Query Interval", "mrdisc.query_int", FT_UINT16, BASE_DEC,
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NULL, 0, "MRDISC Query Interval", HFILL }},
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{ &hf_rv,
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{ "Robustness Variable", "mrdisc.rob_var", FT_UINT16, BASE_DEC,
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NULL, 0, "MRDISC Robustness Variable", HFILL }},
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{ &hf_option_bytes,
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{ "Data", "mrdisc.option_data", FT_BYTES, BASE_NONE,
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NULL, 0, "MRDISC Unknown Option Data", HFILL }},
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};
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static gint *ett[] = {
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&ett_mrdisc,
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&ett_options,
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};
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proto_mrdisc = proto_register_protocol("Multicast Router DISCovery protocol",
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"MRDISC", "mrdisc");
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proto_register_field_array(proto_mrdisc, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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