224 lines
7.2 KiB
C
224 lines
7.2 KiB
C
/* packet-isis.c
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* Routines for ISO/OSI network and transport protocol packet disassembly, core
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* bits.
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*
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* Stuart Stanley <stuarts@mxmail.net>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/expert.h>
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#include <epan/nlpid.h>
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#include <epan/etypes.h>
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#include "packet-osi.h"
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#include "packet-isis.h"
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void proto_register_isis(void);
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void proto_reg_handoff_isis(void);
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static dissector_table_t isis_dissector_table;
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/* isis base header */
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static int proto_isis = -1;
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static int hf_isis_irpd = -1;
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static int hf_isis_header_length = -1;
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static int hf_isis_version = -1;
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static int hf_isis_system_id_length = -1;
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static int hf_isis_type = -1;
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static int hf_isis_type_reserved = -1;
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static int hf_isis_version2 = -1;
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static int hf_isis_reserved = -1;
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static int hf_isis_max_area_adr = -1;
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static gint ett_isis = -1;
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static expert_field ei_isis_version = EI_INIT;
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static expert_field ei_isis_type = EI_INIT;
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static dissector_handle_t isis_handle;
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static const value_string isis_vals[] = {
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{ ISIS_TYPE_L1_HELLO, "L1 HELLO"},
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{ ISIS_TYPE_L2_HELLO, "L2 HELLO"},
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{ ISIS_TYPE_PTP_HELLO, "P2P HELLO"},
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{ ISIS_TYPE_L1_LSP, "L1 LSP"},
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{ ISIS_TYPE_L2_LSP, "L2 LSP"},
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{ ISIS_TYPE_L1_CSNP, "L1 CSNP"},
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{ ISIS_TYPE_L2_CSNP, "L2 CSNP"},
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{ ISIS_TYPE_L1_PSNP, "L1 PSNP"},
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{ ISIS_TYPE_L2_PSNP, "L2 PSNP"},
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{ 0, NULL} };
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static void
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dissect_isis(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti, *version_item;
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proto_tree *isis_tree = NULL;
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int offset = 0;
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guint8 isis_version;
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guint8 isis_type;
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tvbuff_t *next_tvb;
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isis_data_t subdissector_data;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISIS");
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col_clear(pinfo->cinfo, COL_INFO);
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ti = proto_tree_add_item(tree, proto_isis, tvb, 0, -1, ENC_NA);
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isis_tree = proto_item_add_subtree(ti, ett_isis);
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proto_tree_add_item(isis_tree, hf_isis_irpd, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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subdissector_data.header_length = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(isis_tree, hf_isis_header_length, tvb,
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offset, 1, subdissector_data.header_length );
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offset += 1;
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isis_version = tvb_get_guint8(tvb, offset);
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version_item = proto_tree_add_uint(isis_tree, hf_isis_version, tvb,
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offset, 1, isis_version );
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if (isis_version != ISIS_REQUIRED_VERSION){
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col_add_fstr(pinfo->cinfo, COL_INFO,
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"Unknown ISIS version (%u vs %u)",
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isis_version, ISIS_REQUIRED_VERSION );
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expert_add_info(pinfo, version_item, &ei_isis_version);
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return;
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}
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offset += 1;
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subdissector_data.system_id_len = tvb_get_guint8(tvb, offset);
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proto_tree_add_uint(isis_tree, hf_isis_system_id_length, tvb,
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offset, 1, subdissector_data.system_id_len );
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offset += 1;
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isis_type = tvb_get_guint8(tvb, offset) & ISIS_TYPE_MASK;
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col_add_str(pinfo->cinfo, COL_INFO,
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val_to_str ( isis_type, isis_vals, "Unknown (0x%x)" ) );
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proto_tree_add_item(isis_tree, hf_isis_type, tvb, offset, 1, ENC_BIG_ENDIAN );
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proto_tree_add_item(isis_tree, hf_isis_type_reserved, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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proto_tree_add_item(isis_tree, hf_isis_version2, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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proto_tree_add_item(isis_tree, hf_isis_reserved, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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proto_tree_add_item(isis_tree, hf_isis_max_area_adr, tvb, offset, 1, ENC_BIG_ENDIAN );
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offset += 1;
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/*
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* Interpret the system ID length.
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*/
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if (subdissector_data.system_id_len == 0)
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subdissector_data.system_id_len = 6; /* zero means 6-octet ID field length */
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else if (subdissector_data.system_id_len == 255) {
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subdissector_data.system_id_len = 0; /* 255 means null ID field */
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/* XXX - what about the LAN ID? */
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}
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/* XXX - otherwise, must be in the range 1 through 8 */
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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if (!dissector_try_uint_new(isis_dissector_table, isis_type, next_tvb,
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pinfo, tree, TRUE, &subdissector_data))
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{
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proto_tree_add_expert(tree, pinfo, &ei_isis_type, tvb, offset, -1);
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}
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} /* dissect_isis */
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void
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proto_register_isis(void)
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{
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static hf_register_info hf[] = {
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{ &hf_isis_irpd,
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{ "Intra Domain Routing Protocol Discriminator", "isis.irpd",
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FT_UINT8, BASE_HEX, VALS(nlpid_vals), 0x0, NULL, HFILL }},
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{ &hf_isis_header_length,
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{ "PDU Header Length", "isis.len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_isis_version,
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{ "Version", "isis.version", FT_UINT8,
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BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_isis_system_id_length,
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{ "System ID Length", "isis.sysid_len",
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FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
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{ &hf_isis_type,
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{ "PDU Type", "isis.type", FT_UINT8, BASE_DEC,
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VALS(isis_vals), ISIS_TYPE_MASK, NULL, HFILL }},
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{ &hf_isis_type_reserved,
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{ "Reserved", "isis.reserved", FT_UINT8, BASE_HEX,
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NULL, ISIS_TYPE_RESERVED_MASK, NULL, HFILL }},
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{ &hf_isis_version2,
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{ "Version2 (==1)", "isis.version2", FT_UINT8, BASE_DEC, NULL,
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0x0, NULL, HFILL }},
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{ &hf_isis_reserved,
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{ "Reserved (==0)", "isis.reserved", FT_UINT8, BASE_DEC, NULL,
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0x0, NULL, HFILL }},
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{ &hf_isis_max_area_adr,
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{ "Max.AREAs: (0==3)", "isis.max_area_adr", FT_UINT8, BASE_DEC, NULL,
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0x0, NULL, HFILL }},
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};
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/*
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* Note, we pull in the unknown CLV handler here, since it
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* is used by all ISIS packet types.
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*/
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static gint *ett[] = {
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&ett_isis,
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};
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static ei_register_info ei[] = {
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{ &ei_isis_version, { "isis.version.unknown", PI_PROTOCOL, PI_WARN, "Unknown ISIS version", EXPFILL }},
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{ &ei_isis_type, { "isis.type.unknown", PI_PROTOCOL, PI_WARN, "Unknown ISIS packet type", EXPFILL }},
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};
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expert_module_t* expert_isis;
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proto_isis = proto_register_protocol(PROTO_STRING_ISIS, "ISIS", "isis");
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proto_register_field_array(proto_isis, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_isis = expert_register_protocol(proto_isis);
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expert_register_field_array(expert_isis, ei, array_length(ei));
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isis_handle = register_dissector("isis", dissect_isis, proto_isis);
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isis_dissector_table = register_dissector_table("isis.type",
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"ISIS Type", FT_UINT8, BASE_DEC);
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}
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void
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proto_reg_handoff_isis(void)
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{
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dissector_add_uint("osinl.incl", NLPID_ISO10589_ISIS, isis_handle);
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dissector_add_uint("ethertype", ETHERTYPE_L2ISIS, isis_handle);
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}
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