forked from osmocom/wireshark
970f34a557
This patch adds a new feature to dissect HSRPv2 packets. One of the main features of HSRPv2 can enable using HSRP on IPv6. In order to achieve this new feature, HSRPv2 packet format is totally different from HSRPv1. HSRPv2 introduces new TLV formats. This patch can decode these new formats of HSPRv2. svn path=/trunk/; revision=22781
840 lines
37 KiB
C
840 lines
37 KiB
C
/* packet-hsrp.c
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* Routines for the Cisco Hot Standby Router Protocol (HSRP)
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*
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* Heikki Vatiainen <hessu@cs.tut.fi>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Copied from packet-vrrp.c
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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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/*
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* RFC 2281 describes opcodes 0 - 2
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*
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* Op Code 3: **** HSRP Interface State Advertisements ****
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* http://www.cisco.com/en/US/products/sw/iosswrel/ps1834/products_feature_guide09186a00800e9763.html
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*
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* An HSRP interface-state advertisement is sent:
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*
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* * when HSRP on the interface enters or leaves the passive state
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* * when a group on the interface learns a new Active router
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* * periodically while the interface is in the passive state
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*
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* 1 2 3
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Version | Op Code = 3 | TLV Type |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | TLV Length | State | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Active Group Count | Passive Group Count |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Passive Group Count: 2 octet
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*
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* A count of the number of passive groups on the interface. The range
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* of values are 0-256.
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*
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* Active Group Count: 2 octet
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*
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* A count of the number of active groups on the interface. The range
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* of values are 0-256.
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*
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*
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* HSRP Version 2
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* Ref. http://www.smartnetworks.jp/2006/02/hsrp_8_hsrp_version_2.html (Japanese Only)
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*
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* Group State TLV
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*
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Type=1 | Length=40 | HSRP Version | Opcode |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | State | IP Version | Group Number |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Identifier(6octets) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Identifier | Priority(4octets) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Priority cont. | Hello Time(4octets) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Hello Time cont. | Hold Time(4octets) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Hold Time cont. | Virtual IP Address(16octets) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Virtual IP Address cont. |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Virtual IP Address cont. |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Virtual IP Address cont. |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Virtual IP Address cont. |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Interface State TLV
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*
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Type=2 | Length=4 | Active Groups |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Passive Groups |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Text Authentication TLV
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*
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Type=3 | Length=8 | Authentication Data(8octets) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Authentication Data cont. |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Authentication Data cont. |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* MD5 Authentication TLV
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*
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* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Type=4 | Length | Algorithm | Padding |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Flags | IP Address(4octets) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | IP Address cont. | Key ID(4octets) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Key ID cont. | Authentication Data(16octets) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Authentication Data cont. |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Authentication Data cont. |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Authentication Data cont. |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Authentication Data cont. |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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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/packet.h>
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static gint proto_hsrp = -1;
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static dissector_handle_t data_handle;
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static gint hf_hsrp_version = -1;
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static gint hf_hsrp_opcode = -1;
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/* Opcode 0-2 */
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static gint hf_hsrp_state = -1;
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static gint hf_hsrp_hellotime = -1;
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static gint hf_hsrp_holdtime = -1;
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static gint hf_hsrp_priority = -1;
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static gint hf_hsrp_group = -1;
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static gint hf_hsrp_reserved = -1;
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static gint hf_hsrp_auth_data = -1;
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static gint hf_hsrp_virt_ip_addr = -1;
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/* Advertise (3) */
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static gint hf_hsrp_adv_type = -1;
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static gint hf_hsrp_adv_length = -1;
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static gint hf_hsrp_adv_state = -1;
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static gint hf_hsrp_adv_reserved1 = -1;
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static gint hf_hsrp_adv_activegrp = -1;
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static gint hf_hsrp_adv_passivegrp = -1;
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static gint hf_hsrp_adv_reserved2 = -1;
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static gint ett_hsrp = -1;
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/* HSRPv2 */
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static gint hf_hsrp2_version = -1;
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static gint hf_hsrp2_opcode = -1;
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static gint hf_hsrp2_state = -1;
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static gint hf_hsrp2_group_state_tlv = -1;
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static gint hf_hsrp2_interface_state_tlv = -1;
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static gint hf_hsrp2_text_auth_tlv = -1;
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static gint hf_hsrp2_md5_auth_tlv = -1;
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static gint hf_hsrp2_ipversion = -1;
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static gint hf_hsrp2_hellotime = -1;
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static gint hf_hsrp2_holdtime = -1;
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static gint hf_hsrp2_priority = -1;
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static gint hf_hsrp2_identifier = -1;
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static gint hf_hsrp2_group = -1;
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static gint hf_hsrp2_virt_ip_addr = -1;
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static gint hf_hsrp2_virt_ip_addr_v6 = -1;
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static gint hf_hsrp2_auth_data = -1;
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static gint hf_hsrp2_active_group = -1;
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static gint hf_hsrp2_passive_group = -1;
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static gint hf_hsrp2_md5_algorithm = -1;
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static gint hf_hsrp2_md5_flags = -1;
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static gint hf_hsrp2_md5_ip_address= -1;
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static gint hf_hsrp2_md5_key_id= -1;
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static gint hf_hsrp2_md5_auth_data= -1;
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static gint ett_hsrp2_group_state_tlv = -1;
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static gint ett_hsrp2_interface_state_tlv = -1;
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static gint ett_hsrp2_text_auth_tlv = -1;
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static gint ett_hsrp2_md5_auth_tlv = -1;
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#define UDP_PORT_HSRP 1985
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#define UDP_PORT_HSRP2_V6 2029
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#define HSRP_DST_IP_ADDR "224.0.0.2"
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#define HSRP2_DST_IP_ADDR "224.0.0.102"
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struct hsrp_packet { /* Multicast to 224.0.0.2, TTL 1, UDP, port 1985 */
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guint8 version; /* RFC2281 describes version 0 */
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guint8 opcode;
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guint8 state;
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#define HSRP_DEFAULT_HELLOTIME 3
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guint8 hellotime; /* In seconds */
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#define HSRP_DEFAULT_HOLDTIME 10
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guint8 holdtime; /* In seconds */
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guint8 priority; /* Higher is stronger, highest IP address tie-breaker */
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guint8 group; /* Identifies the standby group */
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guint8 reserved;
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guint8 auth_data[8]; /* Clear-text password, recommended default is `cisco' */
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guint32 virt_ip_addr; /* The virtual IP address used by this group */
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};
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struct hsrpv2_packet { /* Multicast to 224.0.0.102, TTL 1, UDP, port 1985 */
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guint8 version;
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guint8 opcode;
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guint8 state;
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#define HSRP2_DEFAULT_HELLOTIME 3000
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guint32 hellotime; /* In msecs */
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#define HSRP2_DEFAULT_HOLDTIME 10000
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guint32 holdtime; /* In msecs */
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guint32 priority; /* Higher is stronger, highest IP address tie-breaker */
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guint16 group; /* Identifies the standby group */
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guint8 identifier[6]; /* Identifier of sender's MAC address */
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guint8 auth_data[8]; /* Clear-text password, recommended default is `cisco' */
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gchar virt_ip_addr[16]; /* The virtual IPv4/IPv6 address used by this group */
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guint8 md5_algorithm; /* MD5 Hash algorithm */
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guint8 md5_flags; /* Undefined */
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guint8 md5_ip_address; /* IP address of sender interface */
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guint8 md5_key_id; /* Name of key chain */
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guint8 md5_auth_data[16]; /* MD5 digest data */
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};
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#define HSRP_OPCODE_HELLO 0
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#define HSRP_OPCODE_COUP 1
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#define HSRP_OPCODE_RESIGN 2
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#define HSRP_OPCODE_ADVERTISE 3
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static const value_string hsrp_opcode_vals[] = {
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{HSRP_OPCODE_HELLO, "Hello"},
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{HSRP_OPCODE_COUP, "Coup"},
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{HSRP_OPCODE_RESIGN, "Resign"},
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{HSRP_OPCODE_ADVERTISE, "Advertise"},
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{0, NULL}
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};
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#define HSRP_STATE_INITIAL 0
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#define HSRP_STATE_LEARN 1
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#define HSRP_STATE_LISTEN 2
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#define HSRP_STATE_SPEAK 4
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#define HSRP_STATE_STANDBY 8
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#define HSRP_STATE_ACTIVE 16
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static const value_string hsrp_state_vals[] = {
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{HSRP_STATE_INITIAL, "Initial"},
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{HSRP_STATE_LEARN, "Learn"},
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{HSRP_STATE_LISTEN, "Listen"},
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{HSRP_STATE_SPEAK, "Speak"},
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{HSRP_STATE_STANDBY, "Standby"},
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{HSRP_STATE_ACTIVE, "Active"},
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{0, NULL}
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};
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#define HSRP_ADV_TYPE_INTSTATE 1
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#define HSRP_ADV_TYPE_IPREDUN 2
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static const value_string hsrp_adv_type_vals[] = {
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{HSRP_ADV_TYPE_INTSTATE, "HSRP interface state"},
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{HSRP_ADV_TYPE_IPREDUN, "IP redundancy"},
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{0, NULL}
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};
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#define HSRP_ADV_STATE_DORMANT 1
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#define HSRP_ADV_STATE_PASSIVE 2
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#define HSRP_ADV_STATE_ACTIVE 3
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static const value_string hsrp_adv_state_vals[] = {
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{HSRP_ADV_STATE_DORMANT, "Dormant"},
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{HSRP_ADV_STATE_PASSIVE, "Passive"},
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{HSRP_ADV_STATE_ACTIVE, "Active"},
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{0, NULL}
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};
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#define HSRP2_OPCODE_HELLO 0
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#define HSRP2_OPCODE_COUP 1
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#define HSRP2_OPCODE_RESIGN 2
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static const value_string hsrp2_opcode_vals[] = {
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{HSRP2_OPCODE_HELLO, "Hello"},
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{HSRP2_OPCODE_COUP, "Coup"},
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{HSRP2_OPCODE_RESIGN, "Resign"},
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{0, NULL}
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};
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#define HSRP2_STATE_DISABLED 0
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#define HSRP2_STATE_INIT 1
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#define HSRP2_STATE_LEARN 2
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#define HSRP2_STATE_LISTEN 3
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#define HSRP2_STATE_SPEAK 4
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#define HSRP2_STATE_STANDBY 5
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#define HSRP2_STATE_ACTIVE 6
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static const value_string hsrp2_state_vals[] = {
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{HSRP2_STATE_INIT, "Init"},
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{HSRP2_STATE_LEARN, "Learn"},
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{HSRP2_STATE_LISTEN, "Listen"},
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{HSRP2_STATE_SPEAK, "Speak"},
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{HSRP2_STATE_STANDBY, "Standby"},
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{HSRP2_STATE_ACTIVE, "Active"},
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{0, NULL}
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};
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#define HSRP2_IPVERSION_IPV4 4
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#define HSRP2_IPVERSION_IPV6 6
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static const value_string hsrp2_ipversion_vals[] = {
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{HSRP2_IPVERSION_IPV4, "IPv4"},
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{HSRP2_IPVERSION_IPV6, "IPv6"},
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{0, NULL}
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};
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#define HSRP2_MD5_ALGORITHM 1
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static const value_string hsrp2_md5_algorithm_vals[] = {
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{HSRP2_MD5_ALGORITHM, "MD5"},
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{0, NULL}
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};
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static int
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dissect_hsrp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tvbuff_t *next_tvb;
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gchar dst[16];
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/* Return if this isn't really HSRP traffic
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* (source and destination port must be UDP_PORT_HSRP on HSRPv1 or HSRPv2(IPv4))
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* (source and destination port must be UDP_PORT_HSRP2_V6 on HSRPv2(IPv6))
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*/
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if(pinfo->destport != UDP_PORT_HSRP && pinfo->destport != UDP_PORT_HSRP2_V6)
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return 0;
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/*
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* To check whether this is an HSRPv1 packet or HSRPv2 on dest IPv4 addr.
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*/
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address_to_str_buf(&(pinfo->dst), dst, sizeof dst);
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if (pinfo->dst.type == AT_IPv4 && strcmp(dst,HSRP_DST_IP_ADDR) == 0) {
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/* HSRPv1 */
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guint8 opcode, state = 0;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "HSRP");
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opcode = tvb_get_guint8(tvb, 1);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s",
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val_to_str(opcode, hsrp_opcode_vals, "Unknown"));
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}
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if (opcode < 3) {
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state = tvb_get_guint8(tvb, 2);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, " (state %s)",
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val_to_str(state, hsrp_state_vals, "Unknown"));
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}
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} else if (opcode == 3) {
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state = tvb_get_guint8(tvb, 6);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, " (state %s)",
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val_to_str(state, hsrp_adv_state_vals, "Unknown"));
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}
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}
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if (tree) {
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proto_item *ti;
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proto_tree *hsrp_tree;
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gint offset;
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guint8 hellotime, holdtime;
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guint8 auth_buf[8 + 1];
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offset = 0;
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ti = proto_tree_add_item(tree, proto_hsrp, tvb, offset, -1, FALSE);
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hsrp_tree = proto_item_add_subtree(ti, ett_hsrp);
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proto_tree_add_item(hsrp_tree, hf_hsrp_version, tvb, offset, 1, FALSE);
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offset++;
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proto_tree_add_uint(hsrp_tree, hf_hsrp_opcode, tvb, offset, 1, opcode);
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offset++;
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if (opcode < 3) {
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proto_tree_add_uint(hsrp_tree, hf_hsrp_state, tvb, offset, 1, state);
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offset++;
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hellotime = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint_format(hsrp_tree, hf_hsrp_hellotime, tvb, offset, 1, hellotime,
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"Hellotime: %sDefault (%u)",
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(hellotime == HSRP_DEFAULT_HELLOTIME) ? "" : "Non-",
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hellotime);
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offset++;
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holdtime = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint_format(hsrp_tree, hf_hsrp_holdtime, tvb, offset, 1, holdtime,
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"Holdtime: %sDefault (%u)",
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(holdtime == HSRP_DEFAULT_HOLDTIME) ? "" : "Non-",
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holdtime);
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offset++;
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proto_tree_add_item(hsrp_tree, hf_hsrp_priority, tvb, offset, 1, FALSE);
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|
offset++;
|
|
proto_tree_add_item(hsrp_tree, hf_hsrp_group, tvb, offset, 1, FALSE);
|
|
offset++;
|
|
proto_tree_add_item(hsrp_tree, hf_hsrp_reserved, tvb, offset, 1, FALSE);
|
|
offset++;
|
|
tvb_memcpy(tvb, auth_buf, offset, 8);
|
|
auth_buf[sizeof auth_buf - 1] = '\0';
|
|
proto_tree_add_string_format(hsrp_tree, hf_hsrp_auth_data, tvb, offset, 8, auth_buf,
|
|
"Authentication Data: %sDefault (%s)",
|
|
(tvb_strneql(tvb, offset, "cisco", strlen("cisco"))) == 0 ? "" : "Non-",
|
|
auth_buf);
|
|
offset += 8;
|
|
proto_tree_add_item(hsrp_tree, hf_hsrp_virt_ip_addr, tvb, offset, 4, FALSE);
|
|
offset += 4;
|
|
} else if (opcode == 3) {
|
|
proto_tree_add_item(hsrp_tree, hf_hsrp_adv_type, tvb, offset, 2, FALSE);
|
|
offset += 2;
|
|
proto_tree_add_item(hsrp_tree, hf_hsrp_adv_length, tvb, offset, 2, FALSE);
|
|
offset += 2;
|
|
proto_tree_add_item(hsrp_tree, hf_hsrp_adv_state, tvb, offset, 1, FALSE);
|
|
offset += 1;
|
|
proto_tree_add_item(hsrp_tree, hf_hsrp_adv_reserved1, tvb, offset, 1, FALSE);
|
|
offset += 1;
|
|
proto_tree_add_item(hsrp_tree, hf_hsrp_adv_activegrp, tvb, offset, 2, FALSE);
|
|
offset += 2;
|
|
proto_tree_add_item(hsrp_tree, hf_hsrp_adv_passivegrp, tvb, offset, 2, FALSE);
|
|
offset += 2;
|
|
proto_tree_add_item(hsrp_tree, hf_hsrp_adv_reserved2, tvb, offset, 4, FALSE);
|
|
offset += 4;
|
|
} else {
|
|
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
|
|
call_dissector(data_handle, next_tvb, pinfo, hsrp_tree);
|
|
}
|
|
}
|
|
} else if ((pinfo->dst.type == AT_IPv4 && strcmp(dst,HSRP2_DST_IP_ADDR) == 0) ||
|
|
(pinfo->dst.type == AT_IPv6 && pinfo->destport == UDP_PORT_HSRP2_V6)) {
|
|
/* HSRPv2 */
|
|
guint offset = 0, offset2;
|
|
proto_item *ti = NULL;
|
|
proto_tree *hsrp_tree = NULL;
|
|
guint8 type,len;
|
|
|
|
if (check_col(pinfo->cinfo, COL_PROTOCOL))
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "HSRPv2");
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_item(tree, proto_hsrp, tvb, offset, -1, FALSE);
|
|
hsrp_tree = proto_item_add_subtree(ti, ett_hsrp);
|
|
}
|
|
|
|
while (tvb_reported_length_remaining(tvb, offset) > 0) {
|
|
type = tvb_get_guint8(tvb, offset);
|
|
len = tvb_get_guint8(tvb, offset+1);
|
|
|
|
offset2 = offset;
|
|
if (type == 1 && len == 40) {
|
|
/* Group State TLV */
|
|
guint8 version,opcode, state = 0, ipver;
|
|
guint32 hellotime, holdtime;
|
|
proto_tree *group_state_tlv;
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_uint_format(hsrp_tree, hf_hsrp2_group_state_tlv, tvb, offset, 2, type,
|
|
"Group State TLV: Type=%d Len=%d", type, len);
|
|
}
|
|
offset+=2;
|
|
|
|
version = tvb_get_guint8(tvb, offset);
|
|
opcode = tvb_get_guint8(tvb, offset+1);
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%s",
|
|
val_to_str(opcode, hsrp2_opcode_vals, "Unknown"));
|
|
}
|
|
|
|
state = tvb_get_guint8(tvb, offset+2);
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (state %s)",
|
|
val_to_str(state, hsrp2_state_vals, "Unknown"));
|
|
}
|
|
|
|
if (tree) {
|
|
/* Making Group State TLV subtree. */
|
|
group_state_tlv = proto_item_add_subtree(ti, ett_hsrp2_group_state_tlv);
|
|
proto_tree_add_item(group_state_tlv, hf_hsrp2_version, tvb, offset, 1, FALSE);
|
|
offset++;
|
|
proto_tree_add_uint(group_state_tlv, hf_hsrp2_opcode, tvb, offset, 1, opcode);
|
|
offset++;
|
|
proto_tree_add_uint(group_state_tlv, hf_hsrp2_state, tvb, offset, 1, state);
|
|
offset++;
|
|
ipver = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(group_state_tlv, hf_hsrp2_ipversion, tvb, offset, 1, ipver);
|
|
offset++;
|
|
proto_tree_add_item(group_state_tlv, hf_hsrp2_group, tvb, offset, 2, FALSE);
|
|
offset+=2;
|
|
proto_tree_add_item(group_state_tlv, hf_hsrp2_identifier, tvb, offset, 6, FALSE);
|
|
offset+=6;
|
|
proto_tree_add_item(group_state_tlv, hf_hsrp2_priority, tvb, offset, 4, FALSE);
|
|
offset+=4;
|
|
|
|
hellotime = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint_format(group_state_tlv, hf_hsrp2_hellotime, tvb, offset, 4, hellotime,
|
|
"Hellotime: %sDefault (%u)",
|
|
(hellotime == HSRP2_DEFAULT_HELLOTIME) ? "" : "Non-",
|
|
hellotime);
|
|
offset+=4;
|
|
holdtime = tvb_get_ntohl(tvb, offset);
|
|
proto_tree_add_uint_format(group_state_tlv, hf_hsrp2_holdtime, tvb, offset, 4, holdtime,
|
|
"Holdtime: %sDefault (%u)",
|
|
(holdtime == HSRP2_DEFAULT_HOLDTIME) ? "" : "Non-",
|
|
holdtime);
|
|
offset+=4;
|
|
if (ipver == 4) {
|
|
/* Fetch Virtual IP as IPv4 */
|
|
proto_tree_add_item(group_state_tlv, hf_hsrp2_virt_ip_addr, tvb, offset, 4, FALSE);
|
|
} else if (ipver == 6) {
|
|
/* Fetch Virtual IP as IPv6 */
|
|
proto_tree_add_item(group_state_tlv, hf_hsrp2_virt_ip_addr_v6, tvb, offset, 16, FALSE);
|
|
} else {
|
|
/* Unknown protocol */
|
|
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
|
|
call_dissector(data_handle, next_tvb, pinfo, hsrp_tree);
|
|
break;
|
|
}
|
|
offset+=16;
|
|
}
|
|
} else if (type == 2 && len == 4) {
|
|
/* Interface State TLV */
|
|
guint16 active,passive;
|
|
active = tvb_get_ntohs(tvb, offset+2);
|
|
passive = tvb_get_ntohs(tvb, offset+4);
|
|
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "Interface State TLV (Act=%d Pass=%d)",active,passive);
|
|
}
|
|
|
|
if (tree) {
|
|
proto_tree *interface_state_tlv;
|
|
ti = proto_tree_add_uint_format(hsrp_tree, hf_hsrp2_interface_state_tlv, tvb, offset, 1, type,
|
|
"Interface State TLV: Type=%d Len=%d", type, len);
|
|
offset+=2;
|
|
|
|
/* Making Interface State TLV subtree */
|
|
interface_state_tlv = proto_item_add_subtree(ti, ett_hsrp2_interface_state_tlv);
|
|
proto_tree_add_item(interface_state_tlv, hf_hsrp2_active_group, tvb, offset, 2, FALSE);
|
|
offset+=2;
|
|
proto_tree_add_item(interface_state_tlv, hf_hsrp2_passive_group, tvb, offset, 2, FALSE);
|
|
offset+=2;
|
|
}
|
|
} else if (type == 3 && len == 8) {
|
|
/* Text Authentication TLV */
|
|
if (tree) {
|
|
proto_tree *text_auth_tlv;
|
|
guint8 auth_buf[8 + 1];
|
|
|
|
ti = proto_tree_add_uint_format(hsrp_tree, hf_hsrp2_text_auth_tlv, tvb, offset, 1, type,
|
|
"Text Authentication TLV: Type=%d Len=%d", type, len);
|
|
offset+=2;
|
|
|
|
/* Making Text Authentication TLV subtree */
|
|
text_auth_tlv = proto_item_add_subtree(ti, ett_hsrp2_text_auth_tlv);
|
|
|
|
tvb_memcpy(tvb, auth_buf, offset, 8);
|
|
auth_buf[sizeof auth_buf - 1] = '\0';
|
|
proto_tree_add_string_format(text_auth_tlv, hf_hsrp2_auth_data, tvb, offset, 8, auth_buf,
|
|
"Authentication Data: %sDefault (%s)",
|
|
(tvb_strneql(tvb, offset, "cisco", strlen("cisco"))) == 0 ? "" : "Non-",
|
|
auth_buf);
|
|
offset += 8;
|
|
}
|
|
} else if (type == 4 && len == 28) {
|
|
/* Text Authentication TLV */
|
|
if (tree) {
|
|
proto_tree *md5_auth_tlv;
|
|
|
|
ti = proto_tree_add_uint_format(hsrp_tree, hf_hsrp2_text_auth_tlv, tvb, offset, 1, type,
|
|
"MD5 Authentication TLV: Type=%d Len=%d", type, len);
|
|
offset+=2;
|
|
|
|
/* Making MD5 Authentication TLV subtree */
|
|
md5_auth_tlv = proto_item_add_subtree(ti, ett_hsrp2_md5_auth_tlv);
|
|
proto_tree_add_item(md5_auth_tlv, hf_hsrp2_md5_algorithm, tvb, offset, 1, FALSE);
|
|
offset++;
|
|
/* Skip padding field */
|
|
offset++;
|
|
proto_tree_add_item(md5_auth_tlv, hf_hsrp2_md5_flags, tvb, offset, 2, FALSE);
|
|
offset+=2;
|
|
proto_tree_add_item(md5_auth_tlv, hf_hsrp2_md5_ip_address, tvb, offset, 4, FALSE);
|
|
offset+=4;
|
|
proto_tree_add_item(md5_auth_tlv, hf_hsrp2_md5_key_id, tvb, offset, 4, FALSE);
|
|
offset+=4;
|
|
proto_tree_add_item(md5_auth_tlv, hf_hsrp2_md5_auth_data, tvb, offset, 16, FALSE);
|
|
offset += 16;
|
|
}
|
|
} else {
|
|
/* Undefined TLV */
|
|
if (tree) {
|
|
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
|
|
call_dissector(data_handle, next_tvb, pinfo, hsrp_tree);
|
|
}
|
|
break;
|
|
}
|
|
offset = offset2+len+2;
|
|
}
|
|
}
|
|
|
|
return tvb_length(tvb);
|
|
}
|
|
|
|
void proto_register_hsrp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_hsrp_version,
|
|
{ "Version", "hsrp.version",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"The version of the HSRP messages", HFILL }},
|
|
|
|
{ &hf_hsrp_opcode,
|
|
{ "Op Code", "hsrp.opcode",
|
|
FT_UINT8, BASE_DEC, VALS(hsrp_opcode_vals), 0x0,
|
|
"The type of message contained in this packet", HFILL }},
|
|
|
|
{ &hf_hsrp_state,
|
|
{ "State", "hsrp.state",
|
|
FT_UINT8, BASE_DEC, VALS(hsrp_state_vals), 0x0,
|
|
"The current state of the router sending the message", HFILL }},
|
|
|
|
{ &hf_hsrp_hellotime,
|
|
{ "Hellotime", "hsrp.hellotime",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"The approximate period between the Hello messages that the router sends", HFILL }},
|
|
|
|
{ &hf_hsrp_holdtime,
|
|
{ "Holdtime", "hsrp.holdtime",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Time that the current Hello message should be considered valid", HFILL }},
|
|
|
|
{ &hf_hsrp_priority,
|
|
{ "Priority", "hsrp.priority",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Used to elect the active and standby routers. Numerically higher priority wins vote", HFILL }},
|
|
|
|
{ &hf_hsrp_group,
|
|
{ "Group", "hsrp.group",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"This field identifies the standby group", HFILL }},
|
|
|
|
{ &hf_hsrp_reserved,
|
|
{ "Reserved", "hsrp.reserved",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Reserved", HFILL }},
|
|
|
|
{ &hf_hsrp_auth_data,
|
|
{ "Authentication Data", "hsrp.auth_data",
|
|
FT_STRING, 0, NULL, 0x0,
|
|
"Contains a clear-text 8 character reused password", HFILL }},
|
|
|
|
{ &hf_hsrp_virt_ip_addr,
|
|
{ "Virtual IP Address", "hsrp.virt_ip",
|
|
FT_IPv4, 0, NULL, 0x0,
|
|
"The virtual IP address used by this group", HFILL }},
|
|
|
|
{ &hf_hsrp_adv_type,
|
|
{ "Adv type", "hsrp.adv.tlvtype",
|
|
FT_UINT16, BASE_DEC, VALS(hsrp_adv_type_vals), 0x0,
|
|
"Advertisement tlv type", HFILL }},
|
|
|
|
{ &hf_hsrp_adv_length,
|
|
{ "Adv length", "hsrp.adv.tlvlength",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Advertisement tlv length", HFILL }},
|
|
|
|
{ &hf_hsrp_adv_state,
|
|
{ "Adv state", "hsrp.adv.state",
|
|
FT_UINT8, BASE_DEC, VALS(hsrp_adv_state_vals), 0x0,
|
|
"Advertisement tlv length", HFILL }},
|
|
|
|
{ &hf_hsrp_adv_reserved1,
|
|
{ "Adv reserved1", "hsrp.adv.reserved1",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Advertisement tlv length", HFILL }},
|
|
|
|
{ &hf_hsrp_adv_activegrp,
|
|
{ "Adv active groups", "hsrp.adv.activegrp",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Advertisement active group count", HFILL }},
|
|
|
|
{ &hf_hsrp_adv_passivegrp,
|
|
{ "Adv passive groups", "hsrp.adv.passivegrp",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Advertisement passive group count", HFILL }},
|
|
|
|
{ &hf_hsrp_adv_reserved2,
|
|
{ "Adv reserved2", "hsrp.adv.reserved2",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Advertisement tlv length", HFILL }},
|
|
|
|
{ &hf_hsrp2_version,
|
|
{ "Version", "hsrp2.version",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"The version of the HSRP messages", HFILL }},
|
|
|
|
{ &hf_hsrp2_opcode,
|
|
{ "Op Code", "hsrp2.opcode",
|
|
FT_UINT8, BASE_DEC, VALS(hsrp2_opcode_vals), 0x0,
|
|
"The type of message contained in this packet", HFILL }},
|
|
|
|
{ &hf_hsrp2_state,
|
|
{ "State", "hsrp2.state",
|
|
FT_UINT8, BASE_DEC, VALS(hsrp2_state_vals), 0x0,
|
|
"The current state of the router sending the message", HFILL }},
|
|
|
|
{ &hf_hsrp2_group_state_tlv,
|
|
{ "Group State TLV", "hsrp2.group_state_tlv",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Group State TLV", HFILL }},
|
|
|
|
{ &hf_hsrp2_interface_state_tlv,
|
|
{ "Interface State TLV", "hsrp2.interface_state_tlv",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Interface State TLV", HFILL }},
|
|
|
|
{ &hf_hsrp2_text_auth_tlv,
|
|
{ "Text Authentication TLV", "hsrp2.text_auth_tlv",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Text Authentication TLV", HFILL }},
|
|
|
|
{ &hf_hsrp2_md5_auth_tlv,
|
|
{ "MD5 Authentication TLV", "hsrp2.md5_auth_tlv",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"MD5 Authentication TLV", HFILL }},
|
|
|
|
{ &hf_hsrp2_ipversion,
|
|
{ "IP Ver.", "hsrp2.ipversion",
|
|
FT_UINT8, BASE_DEC, VALS(hsrp2_ipversion_vals), 0x0,
|
|
"The IP protocol version used in this hsrp message", HFILL }},
|
|
|
|
{ &hf_hsrp2_group,
|
|
{ "Group", "hsrp2.group",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"This field identifies the standby group", HFILL }},
|
|
|
|
{ &hf_hsrp2_identifier,
|
|
{ "Identifier", "hsrp2.identifier",
|
|
FT_ETHER, BASE_NONE, NULL, 0x0,
|
|
"BIA value of a sender interafce", HFILL }},
|
|
|
|
{ &hf_hsrp2_hellotime,
|
|
{ "Hellotime", "hsrp2.hellotime",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"The approximate period between the Hello messages that the router sends", HFILL }},
|
|
|
|
{ &hf_hsrp2_holdtime,
|
|
{ "Holdtime", "hsrp2.holdtime",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Time that the current Hello message should be considered valid", HFILL }},
|
|
|
|
{ &hf_hsrp2_priority,
|
|
{ "Priority", "hsrp2.priority",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"Used to elect the active and standby routers. Numerically higher priority wins vote", HFILL }},
|
|
|
|
{ &hf_hsrp2_auth_data,
|
|
{ "Authentication Data", "hsrp2.auth_data",
|
|
FT_STRING, 0, NULL, 0x0,
|
|
"Contains a clear-text 8 character reused password", HFILL }},
|
|
|
|
{ &hf_hsrp2_virt_ip_addr,
|
|
{ "Virtual IP Address", "hsrp2.virt_ip",
|
|
FT_IPv4, 0, NULL, 0x0,
|
|
"The virtual IP address used by this group", HFILL }},
|
|
|
|
{ &hf_hsrp2_virt_ip_addr_v6,
|
|
{ "Virtual IPv6 Address", "hsrp2.virt_ip_v6",
|
|
FT_IPv6, 0, NULL, 0x0,
|
|
"The virtual IPv6 address used by this group", HFILL }},
|
|
|
|
{ &hf_hsrp2_active_group,
|
|
{ "Active Groups", "hsrp2.active_groups",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Active group number which becomes the active router myself", HFILL }},
|
|
|
|
{ &hf_hsrp2_passive_group,
|
|
{ "Passive Groups", "hsrp2.passive_groups",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
"Standby group number which doesn't become the acitve router myself", HFILL }},
|
|
|
|
{ &hf_hsrp2_md5_algorithm,
|
|
{ "MD5 Algorithm", "hsrp2._md5_algorithm",
|
|
FT_UINT8, BASE_DEC, VALS(hsrp2_md5_algorithm_vals), 0x0,
|
|
"Hash Algorithm used by this group", HFILL }},
|
|
|
|
{ &hf_hsrp2_md5_flags,
|
|
{ "MD5 Flags", "hsrp2._md5_flags",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
"Undefined", HFILL }},
|
|
|
|
{ &hf_hsrp2_md5_ip_address,
|
|
{ "Sender's IP Address", "hsrp.md5_ip_address",
|
|
FT_IPv4, 0, NULL, 0x0,
|
|
"IP Address of the sender interface", HFILL }},
|
|
|
|
{ &hf_hsrp2_md5_key_id,
|
|
{ "MD5 Key ID", "hsrp2.md5_key_id",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"This field contains Key chain ID", HFILL }},
|
|
|
|
{ &hf_hsrp2_md5_auth_data,
|
|
{ "MD5 Authentication Data", "hsrp2.md5_auth_data",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
"MD5 digest string is contained.", HFILL }}
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_hsrp,
|
|
&ett_hsrp2_group_state_tlv,
|
|
&ett_hsrp2_interface_state_tlv,
|
|
&ett_hsrp2_text_auth_tlv,
|
|
&ett_hsrp2_md5_auth_tlv
|
|
};
|
|
|
|
proto_hsrp = proto_register_protocol("Cisco Hot Standby Router Protocol",
|
|
"HSRP", "hsrp");
|
|
proto_register_field_array(proto_hsrp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
return;
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_hsrp(void)
|
|
{
|
|
dissector_handle_t hsrp_handle;
|
|
|
|
data_handle = find_dissector("data");
|
|
hsrp_handle = new_create_dissector_handle(dissect_hsrp, proto_hsrp);
|
|
dissector_add("udp.port", UDP_PORT_HSRP, hsrp_handle);
|
|
dissector_add("udp.port", UDP_PORT_HSRP2_V6, hsrp_handle);
|
|
}
|