forked from osmocom/wireshark
![Laurent Deniel](/assets/img/avatar_default.png)
the following: It is now possible to enable/disable a particular protocol decoding (i.e. the protocol dissector is void or not). When a protocol is disabled, it is displayed as Data and of course, all linked sub-protocols are disabled as well. Disabling a protocol could be interesting: - in case of buggy dissectors - in case of wrong heuristics - for performance reasons - to decode the data as another protocol (TODO) Currently (if I am not wrong), all dissectors but NFS can be disabled (and dissectors that do not register protocols :-) I do not like the way the RPC sub-dissectors are disabled (in the sub-dissectors) since this could be done in the RPC dissector itself, knowing the sub-protocol hfinfo entry (this is why, I've not modified the NFS one yet). Two functions are added in proto.c : gboolean proto_is_protocol_enabled(int n); void proto_set_decoding(int n, gboolean enabled); and two MACROs which can be used in dissectors: OLD_CHECK_DISPLAY_AS_DATA(index, pd, offset, fd, tree) CHECK_DISPLAY_AS_DATA(index, tvb, pinfo, tree) See also the XXX in proto_dlg.c and proto.c around the new functions. svn path=/trunk/; revision=2267
596 lines
16 KiB
C
596 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 1.10 2000/08/13 14:08:19 deniel 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;
|
|
|
|
pdu_length = pntohs(&pd[offset]);
|
|
if (tree) {
|
|
proto_tree_add_uint(hello_tree, hf_isis_hello_pdu_length, NullTVB,
|
|
offset, 2, pdu_length);
|
|
}
|
|
offset += 2;
|
|
|
|
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");
|
|
proto_register_field_array(proto_isis_hello, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|