forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
protocols, in addition to adding structures to the list of filterable fields. Give it an extra argument that specifies a "short name" for the protocol, for use in such places as pinfo->current_proto; the dialog box for constructing filters; the preferences tab for the protocol; and so on (although we're not yet using it in all those places). Make the preference name that appears in the preferences file and the command line for the DIAMETER protocol "diameter", not "Diameter"; the convention is that the name in question be all-lower-case. Make some routines and variables that aren't exported static. Update a comment in the ICP dissector to make it clear that the dissector won't see fragments other than the first fragment of a fragmented datagram. svn path=/trunk/; revision=2810
597 lines
16 KiB
C
597 lines
16 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 1.11 2001/01/03 06:55:29 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@zing.org>
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* Copyright 1998 Gerald Combs
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*
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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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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.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 "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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/* hello packets */
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static int proto_isis_hello = -1;
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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 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_auth = -1;
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static gint ett_isis_hello_clv_ipv4_int_addr = -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_area_address_clv(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree);
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static void dissect_hello_is_neighbors_clv(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree);
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static void dissect_hello_padding_clv(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree);
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static void dissect_hello_nlpid_clv(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree);
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static void dissect_hello_ip_int_addr_clv(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree);
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static void dissect_hello_auth_clv(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree);
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static const isis_clv_handle_t clv_l1_hello_opts[] = {
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{
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ISIS_CLV_L1H_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_L1H_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_L1H_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_L1H_NLPID,
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"NLPID",
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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_L1H_IP_INTERFACE_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_L1H_AUTHENTICATION_NS,
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"Authentication(non spec)",
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&ett_isis_hello_clv_auth,
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dissect_hello_auth_clv
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},
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{
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ISIS_CLV_L1H_AUTHENTICATION,
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"Authentication",
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&ett_isis_hello_clv_auth,
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dissect_hello_auth_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_L2H_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_L2H_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_L2H_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_L2H_NLPID,
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"NLPID",
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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_L2H_IP_INTERFACE_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_L2H_AUTHENTICATION_NS,
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"Authentication(non spec)",
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&ett_isis_hello_clv_auth,
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dissect_hello_auth_clv
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},
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{
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ISIS_CLV_L2H_AUTHENTICATION,
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"Authentication",
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&ett_isis_hello_clv_auth,
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dissect_hello_auth_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_PTP_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_PTP_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_PTP_NLPID,
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"NLPID",
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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_PTP_IP_INTERFACE_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_PTP_AUTHENTICATION_NS,
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"Authentication(non spec)",
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&ett_isis_hello_clv_auth,
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dissect_hello_auth_clv
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},
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{
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ISIS_CLV_PTP_AUTHENTICATION,
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"Authentication",
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&ett_isis_hello_clv_auth,
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dissect_hello_auth_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_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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* u_char * : packet data
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* int : current offset into packet data
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* guint : length of this clv
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* int : length of IDs in packet.
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* frame_data * : frame data
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* proto_tree * : proto tree to build on (may be null)
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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(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree) {
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isis_dissect_nlpid_clv(pd, offset, length, fd, tree );
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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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* u_char * : packet data
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* int : current offset into packet data
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* guint : length of this clv
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* int : length of IDs in packet.
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* frame_data * : frame data
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* proto_tree * : proto tree to build on (may be null)
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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(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree) {
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isis_dissect_ip_int_clv(pd, offset, length, fd, tree,
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hf_isis_hello_clv_ipv4_int_addr );
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}
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/*
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* Name: dissect_hello_auth_clv()
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*
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* Description:
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* Decode for a hello packets authenticaion clv. Calls into the
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* clv common one. An auth inside a hello packet is a perlink
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* password.
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*
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* Input:
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* u_char * : packet data
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* int : current offset into packet data
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* guint : length of this clv
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* int : length of IDs in packet.
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* frame_data * : frame data
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* proto_tree * : proto tree to build on (may be null)
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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_auth_clv(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree) {
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isis_dissect_authentication_clv(pd, offset, length, fd, tree,
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"Per Link authentication" );
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}
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/*
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* Name: dissect_hello_area_address_clv()
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*
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* Description:
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* Decode for a hello packets area address clv. Calls into the
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* clv common one.
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*
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* Input:
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* u_char * : packet data
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* int : current offset into packet data
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* guint : length of this clv
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* int : length of IDs in packet.
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* frame_data * : frame data
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* proto_tree * : proto tree to build on (may be null)
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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_area_address_clv(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree) {
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isis_dissect_area_address_clv(pd, offset, length, fd, tree );
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}
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/*
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* Name: isis_dissect_is_neighbors_clv()
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*
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* Description:
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* Take apart a IS neighbor packet. A neighbor is n 6 byte packets.
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* (they tend to be an 802.3 MAC address, but its not required).
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*
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* Input:
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* u_char * : packet data
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* int : offset into packet data where we are.
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* guint : length of clv we are decoding
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* int : length of IDs in packet.
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* frame_data * : frame data (complete frame)
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* proto_tree * : protocol display tree to fill out. May be NULL
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* gint : tree id to use for proto tree.
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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void
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dissect_hello_is_neighbors_clv(const u_char *pd, int offset,
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guint length, int id_length, frame_data *fd, proto_tree *tree ) {
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while ( length > 0 ) {
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if (length<6) {
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isis_dissect_unknown(offset, length, tree, fd,
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"short is neighbor (%d vs 6)", length );
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return;
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}
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/*
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* Lets turn the area address into "standard" 0000.0000.etc
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* format string.
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*/
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if ( tree ) {
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proto_tree_add_text ( tree, NullTVB, offset, 6,
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"IS Neighbor: %s", print_system_id( pd + offset, 6 ) );
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}
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offset += 6;
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length -= 6;
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}
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}
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/*
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* Name: dissect_hello_padding_clv()
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*
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* Description:
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* Decode for a hello packet's padding clv. Padding does nothing,
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* so we just return.
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*
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* Input:
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* u_char * : packet data
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* int : current offset into packet data
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* guint : length of this clv
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* int : length of IDs in packet.
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* frame_data * : frame data
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* proto_tree * : proto tree to build on (may be null)
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*
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* Output:
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* void
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*/
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static void
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dissect_hello_padding_clv(const u_char *pd, int offset, guint length,
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int id_length, frame_data *fd, proto_tree *tree) {
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/* nothing to do here! */
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}
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/*
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* Name: isis_dissect_isis_hello()
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*
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* Description:
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* This procedure rips apart the various types of ISIS hellos. L1H and
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* L2H's are identical for the most part, while the PTP hello has
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* a shorter header.
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*
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* Input:
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* int : hello type, a la packet-isis.h ISIS_TYPE_* values
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* int : header length of packet.
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* int : length of IDs in packet.
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* u_char * : packet data
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* int offset : our offset into packet data.
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* frame_data * : frame data
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* proto_tree * : protocol display tree to add to. May be NULL.
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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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void
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isis_dissect_isis_hello(int hello_type, int header_length, int id_length,
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const u_char *pd, int offset, frame_data *fd, proto_tree *tree){
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proto_item *ti;
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proto_tree *hello_tree = NULL;
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int len;
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int hlen;
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guint16 pdu_length;
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OLD_CHECK_DISPLAY_AS_DATA(proto_isis_hello, pd, offset, fd, tree);
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if (hello_type == ISIS_TYPE_PTP_HELLO) {
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hlen = 1+id_length+2+2+1;
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} else {
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hlen = 1+id_length+2+2+1+id_length+1;
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}
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if (!BYTES_ARE_IN_FRAME(offset, hlen)) {
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isis_dissect_unknown(offset, hlen, tree, fd,
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"not enough capture data for header (%d vs %d)",
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hlen, END_OF_FRAME);
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return;
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}
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if (tree) {
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ti = proto_tree_add_item(tree, proto_isis_hello, NullTVB,
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offset, END_OF_FRAME, FALSE);
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hello_tree = proto_item_add_subtree(ti, ett_isis_hello);
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proto_tree_add_uint_format(hello_tree,
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hf_isis_hello_circuit_reserved,
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NullTVB, offset, 1, pd[offset],
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"Circuit type : %s, reserved(0x%02x == 0)",
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val_to_str(pd[offset]&ISIS_HELLO_CTYPE_MASK,
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isis_hello_circuit_type_vals,
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"Unknown (0x%x)"),
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pd[offset]&ISIS_HELLO_CT_RESERVED_MASK
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);
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}
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offset += 1;
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if (tree) {
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proto_tree_add_bytes_format(hello_tree, hf_isis_hello_source_id, NullTVB,
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offset, id_length, &pd[offset],
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"SystemID{ Sender of PDU } : %s",
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print_system_id( pd + offset, id_length ) );
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}
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offset += id_length;
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if (tree) {
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proto_tree_add_uint(hello_tree, hf_isis_hello_holding_timer, NullTVB,
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offset, 2, pntohs(&pd[offset]));
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}
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offset += 2;
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pdu_length = pntohs(&pd[offset]);
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if (tree) {
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proto_tree_add_uint(hello_tree, hf_isis_hello_pdu_length, NullTVB,
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offset, 2, pdu_length);
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}
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offset += 2;
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if (tree) {
|
|
proto_tree_add_uint_format(hello_tree, hf_isis_hello_priority_reserved, NullTVB,
|
|
offset, 1, pd[offset],
|
|
"Priority : %d, reserved(0x%02x == 0)",
|
|
pd[offset]&ISIS_HELLO_PRIORITY_MASK,
|
|
pd[offset]&ISIS_HELLO_P_RESERVED_MASK );
|
|
}
|
|
offset += 1;
|
|
|
|
if (hello_type == ISIS_TYPE_PTP_HELLO) {
|
|
if (tree) {
|
|
proto_tree_add_uint(hello_tree, hf_isis_hello_local_circuit_id, NullTVB,
|
|
offset, 1, pd[offset] );
|
|
}
|
|
offset += 1;
|
|
} else {
|
|
if (tree) {
|
|
proto_tree_add_bytes_format(hello_tree, hf_isis_hello_lan_id, NullTVB,
|
|
offset, id_length + 1, &pd[offset],
|
|
"SystemID{ Designated IS } : %s",
|
|
print_system_id( pd + offset, id_length + 1 ) );
|
|
}
|
|
offset += id_length + 1;
|
|
}
|
|
|
|
len = pdu_length;
|
|
len -= header_length;
|
|
if (len < 0) {
|
|
isis_dissect_unknown(offset, header_length, tree, fd,
|
|
"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 ( clv_l1_hello_opts, len, id_length, pd,
|
|
offset, fd, hello_tree, ett_isis_hello_clv_unknown );
|
|
} else if (hello_type == ISIS_TYPE_L2_HELLO) {
|
|
isis_dissect_clvs ( clv_l2_hello_opts, len, id_length, pd,
|
|
offset, fd, hello_tree, ett_isis_hello_clv_unknown );
|
|
} else {
|
|
isis_dissect_clvs ( clv_ptp_hello_opts, len, id_length, pd,
|
|
offset, fd, hello_tree, ett_isis_hello_clv_unknown );
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Name: proto_register_isis_hello()
|
|
*
|
|
* Description:
|
|
* Register our protocol sub-sets with protocol manager.
|
|
* NOTE: this procedure is autolinked by the makefile process that
|
|
* builds register.c
|
|
*
|
|
* Input:
|
|
* void
|
|
*
|
|
* Output:
|
|
* void
|
|
*/
|
|
void
|
|
proto_register_isis_hello(void) {
|
|
static hf_register_info hf[] = {
|
|
{ &hf_isis_hello_circuit_reserved,
|
|
{ "Circuit type ", "isis_hello.circuite_type",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0, "" }},
|
|
|
|
{ &hf_isis_hello_source_id,
|
|
{ "SystemID{ Sender of PDU } ", "isis_hello.source_id",
|
|
FT_BYTES, BASE_HEX, NULL, 0x0, "" }},
|
|
|
|
{ &hf_isis_hello_holding_timer,
|
|
{ "Holding timer ", "isis_hello.holding_timer",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0, "" }},
|
|
|
|
{ &hf_isis_hello_pdu_length,
|
|
{ "PDU length ", "isis_hello.pdu_length",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0, "" }},
|
|
|
|
{ &hf_isis_hello_priority_reserved,
|
|
{ "Priority ", "isis_hello.priority",
|
|
FT_UINT8, BASE_DEC, NULL, ISIS_HELLO_P_RESERVED_MASK, "" }},
|
|
|
|
{ &hf_isis_hello_lan_id,
|
|
{ "SystemID{ Designated IS } ", "isis_hello.lan_id",
|
|
FT_BYTES, BASE_DEC, NULL, 0x0, "" }},
|
|
|
|
{ &hf_isis_hello_local_circuit_id,
|
|
{ "Local circuit ID ", "isis_hello.local_circuit_id",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, "" }},
|
|
|
|
{ &hf_isis_hello_clv_ipv4_int_addr,
|
|
{ "IPv4 interface address ", "isis_hello.clv_ipv4_int_addr",
|
|
FT_IPv4, BASE_NONE, NULL, 0x0, "" }},
|
|
|
|
};
|
|
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_auth,
|
|
&ett_isis_hello_clv_ipv4_int_addr,
|
|
};
|
|
|
|
proto_isis_hello = proto_register_protocol("ISIS HELLO",
|
|
"ISIS HELLO", "isis_hello");
|
|
proto_register_field_array(proto_isis_hello, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|