forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I92c94448e6641716d03158a5f332c8b53709423a Reviewed-on: https://code.wireshark.org/review/25756 Petri-Dish: Dario Lombardo <lomato@gmail.com> Reviewed-by: Anders Broman <a.broman58@gmail.com>
238 lines
7.9 KiB
C
238 lines
7.9 KiB
C
/* packet-isis.c
|
|
* Routines for ISO/OSI network and transport protocol packet disassembly, core
|
|
* bits.
|
|
*
|
|
* Stuart Stanley <stuarts@mxmail.net>
|
|
*
|
|
* Wireshark - Network traffic analyzer
|
|
* By Gerald Combs <gerald@wireshark.org>
|
|
* Copyright 1998 Gerald Combs
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <epan/packet.h>
|
|
#include <epan/expert.h>
|
|
#include <epan/nlpid.h>
|
|
#include <epan/etypes.h>
|
|
#include "packet-osi.h"
|
|
#include "packet-isis.h"
|
|
|
|
void proto_register_isis(void);
|
|
void proto_reg_handoff_isis(void);
|
|
|
|
static dissector_table_t isis_dissector_table;
|
|
|
|
/* isis base header */
|
|
static int proto_isis = -1;
|
|
|
|
static int hf_isis_irpd = -1;
|
|
static int hf_isis_header_length = -1;
|
|
static int hf_isis_version = -1;
|
|
static int hf_isis_system_id_length = -1;
|
|
static int hf_isis_type = -1;
|
|
static int hf_isis_type_reserved = -1;
|
|
static int hf_isis_version2 = -1;
|
|
static int hf_isis_reserved = -1;
|
|
static int hf_isis_max_area_adr = -1;
|
|
int hf_isis_clv_key_id = -1;
|
|
|
|
static gint ett_isis = -1;
|
|
|
|
static expert_field ei_isis_version = EI_INIT;
|
|
static expert_field ei_isis_version2 = EI_INIT;
|
|
static expert_field ei_isis_reserved = EI_INIT;
|
|
static expert_field ei_isis_type = EI_INIT;
|
|
|
|
static dissector_handle_t isis_handle;
|
|
|
|
static const value_string isis_vals[] = {
|
|
{ ISIS_TYPE_L1_HELLO, "L1 HELLO"},
|
|
{ ISIS_TYPE_L2_HELLO, "L2 HELLO"},
|
|
{ ISIS_TYPE_PTP_HELLO, "P2P HELLO"},
|
|
{ ISIS_TYPE_L1_LSP, "L1 LSP"},
|
|
{ ISIS_TYPE_L2_LSP, "L2 LSP"},
|
|
{ ISIS_TYPE_L1_CSNP, "L1 CSNP"},
|
|
{ ISIS_TYPE_L2_CSNP, "L2 CSNP"},
|
|
{ ISIS_TYPE_L1_PSNP, "L1 PSNP"},
|
|
{ ISIS_TYPE_L2_PSNP, "L2 PSNP"},
|
|
{ 0, NULL}
|
|
};
|
|
|
|
static int
|
|
dissect_isis(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
|
|
{
|
|
proto_item *ti, *version_item, *version2_item, *reserved_item;
|
|
proto_tree *isis_tree = NULL;
|
|
int offset = 0;
|
|
guint8 isis_version, isis_version2, isis_reserved;
|
|
guint8 isis_type;
|
|
tvbuff_t *next_tvb;
|
|
isis_data_t subdissector_data;
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISIS");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
ti = proto_tree_add_item(tree, proto_isis, tvb, 0, -1, ENC_NA);
|
|
isis_tree = proto_item_add_subtree(ti, ett_isis);
|
|
|
|
proto_tree_add_item(isis_tree, hf_isis_irpd, tvb, offset, 1, ENC_BIG_ENDIAN );
|
|
offset += 1;
|
|
|
|
subdissector_data.header_length = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(isis_tree, hf_isis_header_length, tvb,
|
|
offset, 1, subdissector_data.header_length );
|
|
offset += 1;
|
|
|
|
isis_version = tvb_get_guint8(tvb, offset);
|
|
version_item = proto_tree_add_uint(isis_tree, hf_isis_version, tvb,
|
|
offset, 1, isis_version );
|
|
if (isis_version != ISIS_REQUIRED_VERSION){
|
|
expert_add_info(pinfo, version_item, &ei_isis_version);
|
|
}
|
|
offset += 1;
|
|
|
|
subdissector_data.system_id_len = tvb_get_guint8(tvb, offset);
|
|
proto_tree_add_uint(isis_tree, hf_isis_system_id_length, tvb,
|
|
offset, 1, subdissector_data.system_id_len );
|
|
offset += 1;
|
|
|
|
proto_tree_add_item(isis_tree, hf_isis_type_reserved, tvb, offset, 1, ENC_BIG_ENDIAN );
|
|
|
|
isis_type = tvb_get_guint8(tvb, offset) & ISIS_TYPE_MASK;
|
|
col_add_str(pinfo->cinfo, COL_INFO,
|
|
val_to_str ( isis_type, isis_vals, "Unknown (0x%x)" ) );
|
|
proto_tree_add_item(isis_tree, hf_isis_type, tvb, offset, 1, ENC_BIG_ENDIAN );
|
|
offset += 1;
|
|
|
|
isis_version2 = tvb_get_guint8(tvb, offset);
|
|
version2_item = proto_tree_add_item(isis_tree, hf_isis_version2, tvb, offset, 1, ENC_BIG_ENDIAN );
|
|
if (isis_version2 != 1) {
|
|
expert_add_info(pinfo, version2_item, &ei_isis_version2);
|
|
}
|
|
offset += 1;
|
|
|
|
isis_reserved = tvb_get_guint8(tvb, offset);
|
|
reserved_item = proto_tree_add_item(isis_tree, hf_isis_reserved, tvb, offset, 1, ENC_BIG_ENDIAN );
|
|
if (isis_reserved != 0) {
|
|
expert_add_info(pinfo, reserved_item, &ei_isis_reserved);
|
|
}
|
|
offset += 1;
|
|
|
|
proto_tree_add_item(isis_tree, hf_isis_max_area_adr, tvb, offset, 1, ENC_BIG_ENDIAN );
|
|
offset += 1;
|
|
|
|
/*
|
|
* Interpret the system ID length.
|
|
*/
|
|
if (subdissector_data.system_id_len == 0)
|
|
subdissector_data.system_id_len = 6; /* zero means 6-octet ID field length */
|
|
else if (subdissector_data.system_id_len == 255) {
|
|
subdissector_data.system_id_len = 0; /* 255 means null ID field */
|
|
/* XXX - what about the LAN ID? */
|
|
}
|
|
/* XXX - otherwise, must be in the range 1 through 8 */
|
|
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
if (!dissector_try_uint_new(isis_dissector_table, isis_type, next_tvb,
|
|
pinfo, tree, TRUE, &subdissector_data))
|
|
{
|
|
proto_tree_add_expert(tree, pinfo, &ei_isis_type, tvb, offset, -1);
|
|
}
|
|
return tvb_captured_length(tvb);
|
|
} /* dissect_isis */
|
|
|
|
void
|
|
proto_register_isis(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_isis_irpd,
|
|
{ "Intradomain Routeing Protocol Discriminator", "isis.irpd",
|
|
FT_UINT8, BASE_HEX, VALS(nlpid_vals), 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_isis_header_length,
|
|
{ "Length Indicator", "isis.len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_isis_version,
|
|
{ "Version/Protocol ID Extension", "isis.version", FT_UINT8,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_isis_system_id_length,
|
|
{ "ID Length", "isis.sysid_len",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
|
|
{ &hf_isis_type,
|
|
{ "PDU Type", "isis.type", FT_UINT8, BASE_DEC,
|
|
VALS(isis_vals), ISIS_TYPE_MASK, NULL, HFILL }},
|
|
|
|
{ &hf_isis_type_reserved,
|
|
{ "Reserved", "isis.type.reserved", FT_UINT8, BASE_HEX,
|
|
NULL, ISIS_TYPE_RESERVED_MASK, NULL, HFILL }},
|
|
|
|
{ &hf_isis_version2,
|
|
{ "Version", "isis.version2", FT_UINT8, BASE_DEC, NULL,
|
|
0x0, NULL, HFILL }},
|
|
|
|
{ &hf_isis_reserved,
|
|
{ "Reserved", "isis.reserved", FT_UINT8, BASE_DEC, NULL,
|
|
0x0, NULL, HFILL }},
|
|
|
|
{ &hf_isis_max_area_adr,
|
|
{ "Maximum Area Addresses", "isis.max_area_adr", FT_UINT8, BASE_DEC, NULL,
|
|
0x0, "Maximum Area Addresses, 0 means 3", HFILL }},
|
|
|
|
{ &hf_isis_clv_key_id,
|
|
{ "Key ID", "isis.clv.key_id", FT_UINT16, BASE_DEC, NULL,
|
|
0x0, NULL, HFILL }},
|
|
};
|
|
/*
|
|
* Note, we pull in the unknown CLV handler here, since it
|
|
* is used by all ISIS packet types.
|
|
*/
|
|
static gint *ett[] = {
|
|
&ett_isis,
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_isis_version, { "isis.version.unknown", PI_PROTOCOL, PI_WARN, "Unknown ISIS version", EXPFILL }},
|
|
{ &ei_isis_version2, { "isis.version2.notone", PI_PROTOCOL, PI_WARN, "Version must be 1", EXPFILL }},
|
|
{ &ei_isis_reserved, { "isis.reserved.notzero", PI_PROTOCOL, PI_WARN, "Reserved must be 0", EXPFILL }},
|
|
{ &ei_isis_type, { "isis.type.unknown", PI_PROTOCOL, PI_WARN, "Unknown ISIS packet type", EXPFILL }},
|
|
};
|
|
|
|
expert_module_t* expert_isis;
|
|
|
|
proto_isis = proto_register_protocol(PROTO_STRING_ISIS, "ISIS", "isis");
|
|
proto_register_field_array(proto_isis, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_isis = expert_register_protocol(proto_isis);
|
|
expert_register_field_array(expert_isis, ei, array_length(ei));
|
|
|
|
isis_handle = register_dissector("isis", dissect_isis, proto_isis);
|
|
|
|
isis_dissector_table = register_dissector_table("isis.type",
|
|
"ISIS Type", proto_isis, FT_UINT8, BASE_DEC);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_isis(void)
|
|
{
|
|
dissector_add_uint("osinl.incl", NLPID_ISO10589_ISIS, isis_handle);
|
|
dissector_add_uint("ethertype", ETHERTYPE_L2ISIS, isis_handle);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|