forked from osmocom/wireshark
929 lines
26 KiB
C
929 lines
26 KiB
C
/* packet-isis-hello.c
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* Routines for decoding isis hello packets and their CLVs
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*
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* $Id: packet-isis-hello.c,v 1.34 2003/12/08 20:40:32 guy Exp $
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* Stuart Stanley <stuarts@mxmail.net>
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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 <stdio.h>
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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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#include "packet-osi.h"
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#include "packet-isis.h"
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#include "packet-isis-clv.h"
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#include "packet-isis-hello.h"
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#include "epan/resolv.h"
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/* hello packets */
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static int hf_isis_hello_circuit_reserved = -1;
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static int hf_isis_hello_source_id = -1;
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static int hf_isis_hello_holding_timer = -1;
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static int hf_isis_hello_pdu_length = -1;
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static int hf_isis_hello_priority_reserved = -1;
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static int hf_isis_hello_lan_id = -1;
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static int hf_isis_hello_local_circuit_id = -1;
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static int hf_isis_hello_clv_ipv4_int_addr = -1;
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static int hf_isis_hello_clv_ipv6_int_addr = -1;
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static int hf_isis_hello_clv_ptp_adj = -1;
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static int hf_isis_hello_clv_mt = -1;
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static gint ett_isis_hello = -1;
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static gint ett_isis_hello_clv_area_addr = -1;
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static gint ett_isis_hello_clv_is_neighbors = -1;
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static gint ett_isis_hello_clv_padding = -1;
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static gint ett_isis_hello_clv_unknown = -1;
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static gint ett_isis_hello_clv_nlpid = -1;
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static gint ett_isis_hello_clv_authentication = -1;
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static gint ett_isis_hello_clv_ip_authentication = -1;
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static gint ett_isis_hello_clv_ipv4_int_addr = -1;
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static gint ett_isis_hello_clv_ipv6_int_addr = -1;
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static gint ett_isis_hello_clv_ptp_adj = -1;
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static gint ett_isis_hello_clv_mt = -1;
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static gint ett_isis_hello_clv_restart = -1;
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static gint ett_isis_hello_clv_checksum = -1;
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static const value_string isis_hello_circuit_type_vals[] = {
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{ ISIS_HELLO_TYPE_RESERVED, "Reserved 0 (discard PDU)"},
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{ ISIS_HELLO_TYPE_LEVEL_1, "Level 1 only"},
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{ ISIS_HELLO_TYPE_LEVEL_2, "Level 2 only"},
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{ ISIS_HELLO_TYPE_LEVEL_12, "Level 1 and 2"},
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{ 0, NULL} };
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/*
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* Predclare dissectors for use in clv dissection.
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*/
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static void dissect_hello_padding_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_hello_is_neighbors_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_hello_ptp_adj_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_hello_area_address_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_hello_authentication_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_hello_ip_authentication_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_hello_checksum_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_hello_ipv6_int_addr_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_hello_ip_int_addr_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_hello_mt_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_hello_nlpid_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_hello_restart_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static const isis_clv_handle_t clv_l1_hello_opts[] = {
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{
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ISIS_CLV_AREA_ADDRESS,
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"Area address(es)",
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&ett_isis_hello_clv_area_addr,
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dissect_hello_area_address_clv
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},
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{
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ISIS_CLV_IS_NEIGHBORS,
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"IS Neighbor(s)",
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&ett_isis_hello_clv_is_neighbors,
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dissect_hello_is_neighbors_clv
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},
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{
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ISIS_CLV_PADDING,
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"Padding",
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&ett_isis_hello_clv_padding,
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dissect_hello_padding_clv
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},
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{
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ISIS_CLV_PROTOCOLS_SUPPORTED,
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"Protocols Supported",
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&ett_isis_hello_clv_nlpid,
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dissect_hello_nlpid_clv
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},
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{
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ISIS_CLV_IP_ADDR,
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"IP Interface address(es)",
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&ett_isis_hello_clv_ipv4_int_addr,
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dissect_hello_ip_int_addr_clv
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},
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{
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ISIS_CLV_IP6_ADDR,
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"IPv6 Interface address(es)",
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&ett_isis_hello_clv_ipv6_int_addr,
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dissect_hello_ipv6_int_addr_clv
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},
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{
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ISIS_CLV_RESTART,
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"Restart Signaling",
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&ett_isis_hello_clv_restart,
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dissect_hello_restart_clv
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},
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{
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ISIS_CLV_AUTHENTICATION,
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"Authentication",
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&ett_isis_hello_clv_authentication,
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dissect_hello_authentication_clv
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},
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{
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ISIS_CLV_IP_AUTHENTICATION,
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"IP Authentication",
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&ett_isis_hello_clv_ip_authentication,
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dissect_hello_ip_authentication_clv
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},
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{
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ISIS_CLV_MT_SUPPORTED,
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"Multi Topology",
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&ett_isis_hello_clv_mt,
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dissect_hello_mt_clv
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},
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{
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ISIS_CLV_CHECKSUM,
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"Checksum",
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&ett_isis_hello_clv_checksum,
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dissect_hello_checksum_clv
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},
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{
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0,
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"",
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NULL,
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NULL
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}
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};
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static const isis_clv_handle_t clv_l2_hello_opts[] = {
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{
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ISIS_CLV_AREA_ADDRESS,
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"Area address(es)",
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&ett_isis_hello_clv_area_addr,
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dissect_hello_area_address_clv
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},
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{
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ISIS_CLV_IS_NEIGHBORS,
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"IS Neighbor(s)",
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&ett_isis_hello_clv_is_neighbors,
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dissect_hello_is_neighbors_clv
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},
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{
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ISIS_CLV_PADDING,
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"Padding",
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&ett_isis_hello_clv_padding,
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dissect_hello_padding_clv
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},
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{
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ISIS_CLV_PROTOCOLS_SUPPORTED,
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"Protocols Supported",
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&ett_isis_hello_clv_nlpid,
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dissect_hello_nlpid_clv
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},
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{
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ISIS_CLV_IP_ADDR,
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"IP Interface address(es)",
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&ett_isis_hello_clv_ipv4_int_addr,
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dissect_hello_ip_int_addr_clv
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},
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{
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ISIS_CLV_IP6_ADDR,
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"IPv6 Interface address(es)",
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&ett_isis_hello_clv_ipv6_int_addr,
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dissect_hello_ipv6_int_addr_clv
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},
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{
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ISIS_CLV_AUTHENTICATION,
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"Authentication",
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&ett_isis_hello_clv_authentication,
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dissect_hello_authentication_clv
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},
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{
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ISIS_CLV_IP_AUTHENTICATION,
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"IP Authentication",
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&ett_isis_hello_clv_ip_authentication,
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dissect_hello_ip_authentication_clv
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},
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{
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ISIS_CLV_RESTART,
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"Restart Signaling",
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&ett_isis_hello_clv_restart,
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dissect_hello_restart_clv
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},
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{
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ISIS_CLV_MT_SUPPORTED,
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"Multi Topology",
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&ett_isis_hello_clv_mt,
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dissect_hello_mt_clv
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},
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{
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ISIS_CLV_CHECKSUM,
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"Checksum",
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&ett_isis_hello_clv_checksum,
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dissect_hello_checksum_clv
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},
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{
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0,
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"",
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NULL,
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NULL
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}
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};
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static const isis_clv_handle_t clv_ptp_hello_opts[] = {
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{
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ISIS_CLV_AREA_ADDRESS,
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"Area address(es)",
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&ett_isis_hello_clv_area_addr,
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dissect_hello_area_address_clv
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},
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{
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ISIS_CLV_PADDING,
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"Padding",
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&ett_isis_hello_clv_padding,
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dissect_hello_padding_clv
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},
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{
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ISIS_CLV_PROTOCOLS_SUPPORTED,
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"Protocols Supported",
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&ett_isis_hello_clv_nlpid,
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dissect_hello_nlpid_clv
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},
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{
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ISIS_CLV_IP_ADDR,
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"IP Interface address(es)",
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&ett_isis_hello_clv_ipv4_int_addr,
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dissect_hello_ip_int_addr_clv
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},
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{
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ISIS_CLV_IP6_ADDR,
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"IPv6 Interface address(es)",
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&ett_isis_hello_clv_ipv6_int_addr,
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dissect_hello_ipv6_int_addr_clv
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},
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{
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ISIS_CLV_AUTHENTICATION,
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"Authentication",
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&ett_isis_hello_clv_authentication,
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dissect_hello_authentication_clv
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},
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{
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ISIS_CLV_IP_AUTHENTICATION,
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"IP Authentication",
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&ett_isis_hello_clv_ip_authentication,
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dissect_hello_ip_authentication_clv
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},
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{
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ISIS_CLV_RESTART,
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"Restart Option",
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&ett_isis_hello_clv_restart,
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dissect_hello_restart_clv
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},
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{
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ISIS_CLV_PTP_ADJ_STATE,
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"Point-to-point Adjacency State",
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&ett_isis_hello_clv_ptp_adj,
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dissect_hello_ptp_adj_clv
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},
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{
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ISIS_CLV_MT_SUPPORTED,
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"Multi Topology",
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&ett_isis_hello_clv_mt,
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dissect_hello_mt_clv
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},
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{
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ISIS_CLV_CHECKSUM,
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"Checksum",
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&ett_isis_hello_clv_checksum,
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dissect_hello_checksum_clv
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},
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{
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0,
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"",
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NULL,
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NULL
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}
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};
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/*
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* Name: dissect_hello_restart_clv()
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*
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* Description:
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* Decode for a restart clv - only found in IIHs
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* hence no call in the common clv dissector
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*
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*/
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static void
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dissect_hello_restart_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length _U_, int length)
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{
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int restart_options;
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if (length != 3) {
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isis_dissect_unknown(tvb, tree, offset,
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"malformed TLV (%d vs 3)",
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length, 3 );
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return;
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}
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restart_options = tvb_get_guint8(tvb, offset);
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proto_tree_add_text ( tree, tvb, offset, 1,
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"Restart Request bit %s, "
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"Restart Acknowledgement bit %s",
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ISIS_MASK_RESTART_RR(restart_options) ? "set" : "clear",
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ISIS_MASK_RESTART_RA(restart_options) ? "set" : "clear");
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proto_tree_add_text ( tree, tvb, offset+1, 2,
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"Remaining holding time: %us",
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tvb_get_ntohs(tvb, offset+1) );
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}
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/*
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* Name: dissect_hello_nlpid_clv()
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*
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* Description:
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* Decode for a hello packets NLPID clv. Calls into the
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* clv common one.
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*
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* Input:
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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : proto tree to build on (may be null)
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* int : current offset into packet data
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* int : length of IDs in packet.
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* int : length of this clv
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*
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* Output:
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* void, will modify proto_tree if not null.
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*/
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static void
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dissect_hello_nlpid_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length _U_, int length)
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{
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isis_dissect_nlpid_clv(tvb, tree, offset, length);
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}
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/*
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* Name: dissect_hello_mt_clv()
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*
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* Description:
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* Decode for a hello packets Multi Topology clv. Calls into the
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* clv common one.
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*
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* Input:
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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : proto tree to build on (may be null)
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* int : current offset into packet data
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* int : length of IDs in packet.
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* int : length of this clv
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*
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* Output:
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* void, will modify proto_tree if not null.
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*/
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static void
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dissect_hello_mt_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length _U_, int length)
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{
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isis_dissect_mt_clv(tvb, tree, offset, length,
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hf_isis_hello_clv_mt );
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}
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/*
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* Name: dissect_hello_ip_int_addr_clv()
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*
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* Description:
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* Decode for a hello packets ip interface addr clv. Calls into the
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* clv common one.
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*
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* Input:
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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : proto tree to build on (may be null)
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* int : current offset into packet data
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* int : length of IDs in packet.
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* int : length of this clv
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*
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* Output:
|
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* void, will modify proto_tree if not null.
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*/
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static void
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dissect_hello_ip_int_addr_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length _U_, int length)
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{
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isis_dissect_ip_int_clv(tvb, tree, offset, length,
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hf_isis_hello_clv_ipv4_int_addr );
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}
|
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|
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/*
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* Name: dissect_hello_ipv6_int_addr_clv()
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*
|
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* Description:
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* Decode for a hello packets ipv6 interface addr clv. Calls into the
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* clv common one.
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*
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* Input:
|
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* tvbuff_t * : tvbuffer for packet data
|
|
* proto_tree * : proto tree to build on (may be null)
|
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* int : current offset into packet data
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* int : length of IDs in packet.
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* int : length of this clv
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*
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* Output:
|
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* void, will modify proto_tree if not null.
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*/
|
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static void
|
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dissect_hello_ipv6_int_addr_clv(tvbuff_t *tvb,
|
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proto_tree *tree, int offset, int id_length _U_, int length)
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{
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isis_dissect_ipv6_int_clv(tvb, tree, offset, length,
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hf_isis_hello_clv_ipv6_int_addr );
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}
|
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|
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/*
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* Name: dissect_hello_authentication_clv()
|
|
*
|
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* Description:
|
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* Decode for a hello packets authenticaion clv.
|
|
* Calls into the CLV common one.
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|
*
|
|
* Input:
|
|
* tvbuff_t * : tvbuffer for packet data
|
|
* proto_tree * : proto tree to build on (may be null)
|
|
* int : current offset into packet data
|
|
* int : length of IDs in packet.
|
|
* int : length of this clv
|
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*
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* Output:
|
|
* void, will modify proto_tree if not null.
|
|
*/
|
|
static void
|
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dissect_hello_authentication_clv(tvbuff_t *tvb,
|
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proto_tree *tree, int offset, int id_length _U_, int length)
|
|
{
|
|
isis_dissect_authentication_clv(tvb, tree, offset, length);
|
|
}
|
|
|
|
/*
|
|
* Name: dissect_hello_ip_authentication_clv()
|
|
*
|
|
* Description:
|
|
* Decode for a hello packets IP authenticaion clv.
|
|
* Calls into the CLV common one.
|
|
*
|
|
* Input:
|
|
* tvbuff_t * : tvbuffer for packet data
|
|
* proto_tree * : proto tree to build on (may be null)
|
|
* int : current offset into packet data
|
|
* int : length of IDs in packet.
|
|
* int : length of this clv
|
|
*
|
|
* Output:
|
|
* void, will modify proto_tree if not null.
|
|
*/
|
|
static void
|
|
dissect_hello_ip_authentication_clv(tvbuff_t *tvb,
|
|
proto_tree *tree, int offset, int id_length _U_, int length)
|
|
{
|
|
isis_dissect_ip_authentication_clv(tvb, tree, offset, length);
|
|
}
|
|
|
|
/*
|
|
* Name: dissect_hello_checksum_clv()
|
|
*
|
|
* Description:
|
|
* dump and verify the optional checksum in TLV 12
|
|
*
|
|
* Input:
|
|
* tvbuff_t * : tvbuffer for packet data
|
|
* proto_tree * : protocol display tree to fill out. May be NULL
|
|
* int : offset into packet data where we are.
|
|
* int : length of clv we are decoding
|
|
*
|
|
* Output:
|
|
* void, but we will add to proto tree if !NULL.
|
|
*/
|
|
|
|
static void
|
|
dissect_hello_checksum_clv(tvbuff_t *tvb,
|
|
proto_tree *tree, int offset, int id_length _U_, int length) {
|
|
|
|
guint16 pdu_length,checksum, cacl_checksum=0;
|
|
|
|
if (tree) {
|
|
if ( length != 2 ) {
|
|
proto_tree_add_text ( tree, tvb, offset, length,
|
|
"incorrect checksum length (%u), should be (2)", length );
|
|
return;
|
|
}
|
|
|
|
checksum = tvb_get_ntohs(tvb, offset);
|
|
|
|
/* the check_and_get_checksum() function needs to know how big
|
|
* the packet is. we can either pass through the pdu-len through several layers
|
|
* of dissectors and wrappers or extract the PDU length field from the PDU specific header
|
|
* which is offseted 17 bytes in IIHs (relative to the beginning of the IS-IS packet) */
|
|
|
|
pdu_length = tvb_get_ntohs(tvb, 17);
|
|
|
|
/* unlike the LSP checksum verification which starts at an offset of 12 we start at offset 0*/
|
|
switch (check_and_get_checksum(tvb, 0, pdu_length, checksum, offset, &cacl_checksum))
|
|
{
|
|
|
|
case NO_CKSUM :
|
|
proto_tree_add_text ( tree, tvb, offset, length,
|
|
"Checksum: 0x%04x (unused)", checksum);
|
|
break;
|
|
case DATA_MISSING :
|
|
isis_dissect_unknown(tvb, tree, offset,
|
|
"packet length %d went beyond packet",
|
|
tvb_length_remaining(tvb, 0));
|
|
break;
|
|
case CKSUM_NOT_OK :
|
|
proto_tree_add_text ( tree, tvb, offset, length,
|
|
"Checksum: 0x%04x (incorrect, should be 0x%04x)",
|
|
checksum,
|
|
cacl_checksum);
|
|
break;
|
|
case CKSUM_OK :
|
|
proto_tree_add_text ( tree, tvb, offset, length,
|
|
"Checksum: 0x%04x (correct)", checksum);
|
|
break;
|
|
default :
|
|
g_message("'check_and_get_checksum' returned an invalid value");
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
* Name: dissect_hello_area_address_clv()
|
|
*
|
|
* Description:
|
|
* Decode for a hello packets area address clv.
|
|
* Calls into the CLV common one.
|
|
*
|
|
* Input:
|
|
* tvbuff_t * : tvbuffer for packet data
|
|
* proto_tree * : proto tree to build on (may be null)
|
|
* int : current offset into packet data
|
|
* int : length of IDs in packet.
|
|
* int : length of this clv
|
|
*
|
|
* Output:
|
|
* void, will modify proto_tree if not null.
|
|
*/
|
|
static void
|
|
dissect_hello_area_address_clv(tvbuff_t *tvb,
|
|
proto_tree *tree, int offset, int id_length _U_, int length)
|
|
{
|
|
isis_dissect_area_address_clv(tvb, tree, offset, length);
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
dissect_hello_ptp_adj_clv(tvbuff_t *tvb,
|
|
proto_tree *tree, int offset, int id_length _U_, int length)
|
|
{
|
|
static const value_string adj_state_vals[] = {
|
|
{ 0, "Up" },
|
|
{ 1, "Initializing" },
|
|
{ 2, "Down" },
|
|
{ 0, NULL }
|
|
};
|
|
guint8 adj_state;
|
|
char *adj_state_str;
|
|
|
|
adj_state = tvb_get_guint8(tvb, offset);
|
|
adj_state_str = val_to_str(adj_state, adj_state_vals, "Unknown (%u)");
|
|
switch(length) {
|
|
case 1:
|
|
proto_tree_add_text ( tree, tvb, offset, 1,
|
|
"Adjacency State: %s", adj_state_str );
|
|
break;
|
|
case 5:
|
|
proto_tree_add_text ( tree, tvb, offset, 1,
|
|
"Adjacency State: %s", adj_state_str );
|
|
proto_tree_add_text ( tree, tvb, offset+1, 4,
|
|
"Extended Local circuit ID: 0x%08x", tvb_get_ntohl(tvb, offset+1) );
|
|
break;
|
|
case 11:
|
|
proto_tree_add_text ( tree, tvb, offset, 1,
|
|
"Adjacency State: %s", adj_state_str );
|
|
proto_tree_add_text ( tree, tvb, offset+1, 4,
|
|
"Extended Local circuit ID: 0x%08x", tvb_get_ntohl(tvb, offset+1) );
|
|
proto_tree_add_text ( tree, tvb, offset+5, 6,
|
|
"Neighbor SystemID: %s", print_system_id( tvb_get_ptr(tvb, offset+5, 6), 6 ) );
|
|
break;
|
|
case 15:
|
|
proto_tree_add_text ( tree, tvb, offset, 1,
|
|
"Adjacency State: %s", adj_state_str );
|
|
proto_tree_add_text ( tree, tvb, offset+1, 4,
|
|
"Extended Local circuit ID: 0x%08x", tvb_get_ntohl(tvb, offset+1) );
|
|
proto_tree_add_text ( tree, tvb, offset+5, 6,
|
|
"Neighbor SystemID: %s", print_system_id( tvb_get_ptr(tvb, offset+5, 6), 6 ) );
|
|
proto_tree_add_text ( tree, tvb, offset+11, 4,
|
|
"Neighbor Extended Local circuit ID: 0x%08x", tvb_get_ntohl(tvb, offset+11) );
|
|
break;
|
|
default:
|
|
isis_dissect_unknown(tvb, tree, offset,
|
|
"malformed TLV (%d vs 1,5,11,15)", length );
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Name: isis_dissect_is_neighbors_clv()
|
|
*
|
|
* Description:
|
|
* Take apart a IS neighbor packet. A neighbor is n 6 byte packets.
|
|
* (they tend to be an 802.3 MAC address, but its not required).
|
|
*
|
|
* Input:
|
|
* tvbuff_t * : tvbuffer for packet data
|
|
* proto_tree * : protocol display tree to fill out. May be NULL
|
|
* int : offset into packet data where we are.
|
|
* int : length of IDs in packet.
|
|
* int : length of clv we are decoding
|
|
*
|
|
* Output:
|
|
* void, but we will add to proto tree if !NULL.
|
|
*/
|
|
static void
|
|
dissect_hello_is_neighbors_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
|
|
int id_length _U_, int length)
|
|
{
|
|
while ( length > 0 ) {
|
|
if (length<6) {
|
|
isis_dissect_unknown(tvb, tree, offset,
|
|
"short is neighbor (%d vs 6)", length );
|
|
return;
|
|
}
|
|
/*
|
|
* Lets turn the area address into "standard" 0000.0000.etc
|
|
* format string.
|
|
*/
|
|
if ( tree ) {
|
|
proto_tree_add_text ( tree, tvb, offset, 6,
|
|
"IS Neighbor: %s", get_ether_name( tvb_get_ptr(tvb, offset, 6)) );
|
|
}
|
|
offset += 6;
|
|
length -= 6;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Name: dissect_hello_padding_clv()
|
|
*
|
|
* Description:
|
|
* Decode for a hello packet's padding clv. Padding does nothing,
|
|
* so we just return.
|
|
*
|
|
* Input:
|
|
* tvbuff_t * : tvbuffer for packet data
|
|
* proto_tree * : proto tree to build on (may be null)
|
|
* int : current offset into packet data
|
|
* int : length of IDs in packet.
|
|
* int : length of this clv
|
|
*
|
|
* Output:
|
|
* void
|
|
*/
|
|
static void
|
|
dissect_hello_padding_clv(tvbuff_t *tvb _U_, proto_tree *tree _U_, int offset _U_,
|
|
int id_length _U_, int length _U_)
|
|
{
|
|
/* nothing to do here! */
|
|
}
|
|
|
|
|
|
/*
|
|
* Name: isis_dissect_isis_hello()
|
|
*
|
|
* Description:
|
|
* This procedure rips apart the various types of ISIS hellos. L1H and
|
|
* L2H's are identical for the most part, while the PTP hello has
|
|
* a shorter header.
|
|
*
|
|
* Input:
|
|
* tvbuff_t * : tvbuffer for packet data
|
|
* proto_tree * : protocol display tree to add to. May be NULL.
|
|
* int offset : our offset into packet data.
|
|
* int : hello type, a la packet-isis.h ISIS_TYPE_* values
|
|
* int : header length of packet.
|
|
* int : length of IDs in packet.
|
|
*
|
|
* Output:
|
|
* void, will modify proto_tree if not NULL.
|
|
*/
|
|
void
|
|
isis_dissect_isis_hello(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset,
|
|
int hello_type, int header_length, int id_length)
|
|
{
|
|
proto_item *ti;
|
|
proto_tree *hello_tree = NULL;
|
|
int len;
|
|
guint8 octet;
|
|
const guint8 *source_id;
|
|
guint16 pdu_length;
|
|
const guint8 *lan_id;
|
|
|
|
if (tree) {
|
|
ti = proto_tree_add_text(tree, tvb, offset, -1, "ISIS HELLO");
|
|
hello_tree = proto_item_add_subtree(ti, ett_isis_hello);
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint_format(hello_tree,
|
|
hf_isis_hello_circuit_reserved,
|
|
tvb, offset, 1, octet,
|
|
"Circuit type : %s, reserved(0x%02x == 0)",
|
|
val_to_str(octet&ISIS_HELLO_CTYPE_MASK,
|
|
isis_hello_circuit_type_vals,
|
|
"Unknown (0x%x)"),
|
|
octet&ISIS_HELLO_CT_RESERVED_MASK
|
|
);
|
|
}
|
|
offset += 1;
|
|
|
|
if (tree) {
|
|
source_id = tvb_get_ptr(tvb, offset, id_length);
|
|
proto_tree_add_bytes_format(hello_tree, hf_isis_hello_source_id, tvb,
|
|
offset, id_length, source_id,
|
|
"System-ID {Sender of PDU} : %s",
|
|
print_system_id( source_id, id_length ) );
|
|
}
|
|
if (check_col(pinfo->cinfo, COL_INFO)) {
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", System-ID: %s",
|
|
print_system_id( tvb_get_ptr(tvb, offset, id_length), id_length ) );
|
|
}
|
|
offset += id_length;
|
|
|
|
if (tree) {
|
|
proto_tree_add_item(hello_tree, hf_isis_hello_holding_timer, tvb,
|
|
offset, 2, FALSE);
|
|
}
|
|
offset += 2;
|
|
|
|
pdu_length = tvb_get_ntohs(tvb, offset);
|
|
if (tree) {
|
|
proto_tree_add_uint(hello_tree, hf_isis_hello_pdu_length, tvb,
|
|
offset, 2, pdu_length);
|
|
}
|
|
offset += 2;
|
|
|
|
if (hello_type == ISIS_TYPE_PTP_HELLO) {
|
|
if (tree) {
|
|
proto_tree_add_item(hello_tree, hf_isis_hello_local_circuit_id, tvb,
|
|
offset, 1, FALSE );
|
|
}
|
|
offset += 1;
|
|
} else {
|
|
if (tree) {
|
|
octet = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint_format(hello_tree, hf_isis_hello_priority_reserved, tvb,
|
|
offset, 1, octet,
|
|
"Priority : %d, reserved(0x%02x == 0)",
|
|
octet&ISIS_HELLO_PRIORITY_MASK,
|
|
octet&ISIS_HELLO_P_RESERVED_MASK );
|
|
}
|
|
offset += 1;
|
|
|
|
if (tree) {
|
|
lan_id = tvb_get_ptr(tvb, offset, id_length+1);
|
|
proto_tree_add_bytes_format(hello_tree, hf_isis_hello_lan_id, tvb,
|
|
offset, id_length + 1, lan_id,
|
|
"System-ID {Designated IS} : %s",
|
|
print_system_id( lan_id, id_length + 1 ) );
|
|
}
|
|
offset += id_length + 1;
|
|
}
|
|
|
|
len = pdu_length;
|
|
len -= header_length;
|
|
if (len < 0) {
|
|
isis_dissect_unknown(tvb, tree, offset,
|
|
"Packet header length %d went beyond packet",
|
|
header_length );
|
|
return;
|
|
}
|
|
/*
|
|
* Now, we need to decode our CLVs. We need to pass in
|
|
* our list of valid ones!
|
|
*/
|
|
if (hello_type == ISIS_TYPE_L1_HELLO){
|
|
isis_dissect_clvs(tvb, hello_tree, offset,
|
|
clv_l1_hello_opts, len, id_length,
|
|
ett_isis_hello_clv_unknown);
|
|
} else if (hello_type == ISIS_TYPE_L2_HELLO) {
|
|
isis_dissect_clvs(tvb, hello_tree, offset,
|
|
clv_l2_hello_opts, len, id_length,
|
|
ett_isis_hello_clv_unknown);
|
|
} else {
|
|
isis_dissect_clvs(tvb, hello_tree, offset,
|
|
clv_ptp_hello_opts, len, id_length,
|
|
ett_isis_hello_clv_unknown);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Name: isis_register_hello()
|
|
*
|
|
* Description:
|
|
* Register our protocol sub-sets with protocol manager.
|
|
*
|
|
* Input:
|
|
* int : protocol index for the ISIS protocol
|
|
*
|
|
* Output:
|
|
* void
|
|
*/
|
|
void
|
|
isis_register_hello(int proto_isis) {
|
|
static hf_register_info hf[] = {
|
|
{ &hf_isis_hello_circuit_reserved,
|
|
{ "Circuit type ", "isis.hello.circuit_type",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL }},
|
|
|
|
{ &hf_isis_hello_source_id,
|
|
{ "SystemID{ Sender of PDU } ", "isis.hello.source_id",
|
|
FT_BYTES, BASE_HEX, NULL, 0x0, "", HFILL }},
|
|
|
|
{ &hf_isis_hello_holding_timer,
|
|
{ "Holding timer ", "isis.hello.holding_timer",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }},
|
|
|
|
{ &hf_isis_hello_pdu_length,
|
|
{ "PDU length ", "isis.hello.pdu_length",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }},
|
|
|
|
{ &hf_isis_hello_priority_reserved,
|
|
{ "Priority ", "isis.hello.priority",
|
|
FT_UINT8, BASE_DEC, NULL, ISIS_HELLO_P_RESERVED_MASK, "", HFILL }},
|
|
|
|
{ &hf_isis_hello_lan_id,
|
|
{ "SystemID{ Designated IS } ", "isis.hello.lan_id",
|
|
FT_BYTES, BASE_DEC, NULL, 0x0, "", HFILL }},
|
|
|
|
{ &hf_isis_hello_local_circuit_id,
|
|
{ "Local circuit ID ", "isis.hello.local_circuit_id",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
|
|
|
|
{ &hf_isis_hello_clv_ipv4_int_addr,
|
|
{ "IPv4 interface address ", "isis.hello.clv_ipv4_int_addr",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL }},
|
|
|
|
{ &hf_isis_hello_clv_ipv6_int_addr,
|
|
{ "IPv6 interface address ", "isis.hello.clv_ipv6_int_addr",
|
|
FT_IPv6, BASE_NONE, NULL, 0x0, "", HFILL }},
|
|
|
|
{ &hf_isis_hello_clv_ptp_adj,
|
|
{ "Point-to-point Adjacency ", "isis.hello.clv_ptp_adj",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
|
|
|
|
{ &hf_isis_hello_clv_mt,
|
|
{ "MT-ID ", "isis.hello.clv_mt",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_isis_hello,
|
|
&ett_isis_hello_clv_area_addr,
|
|
&ett_isis_hello_clv_is_neighbors,
|
|
&ett_isis_hello_clv_padding,
|
|
&ett_isis_hello_clv_unknown,
|
|
&ett_isis_hello_clv_nlpid,
|
|
&ett_isis_hello_clv_authentication,
|
|
&ett_isis_hello_clv_ip_authentication,
|
|
&ett_isis_hello_clv_ipv4_int_addr,
|
|
&ett_isis_hello_clv_ipv6_int_addr,
|
|
&ett_isis_hello_clv_ptp_adj,
|
|
&ett_isis_hello_clv_mt,
|
|
&ett_isis_hello_clv_restart,
|
|
&ett_isis_hello_clv_checksum
|
|
};
|
|
|
|
proto_register_field_array(proto_isis, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|