2 * Routines for ISO/OSI network and transport protocol packet disassembly, core
5 * $Id: packet-isis.c,v 1.35 2003/03/31 08:09:28 guy Exp $
6 * Stuart Stanley <stuarts@mxmail.net>
8 * Ethereal - Network traffic analyzer
9 * By Gerald Combs <gerald@ethereal.com>
10 * Copyright 1998 Gerald Combs
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
34 #include <epan/packet.h>
36 #include "packet-osi.h"
37 #include "packet-isis.h"
38 #include "packet-isis-lsp.h"
39 #include "packet-isis-hello.h"
40 #include "packet-isis-snp.h"
43 /* isis base header */
44 static int proto_isis = -1;
46 static int hf_isis_irpd = -1;
47 static int hf_isis_header_length = -1;
48 static int hf_isis_version = -1;
49 static int hf_isis_system_id_length = -1;
50 static int hf_isis_type = -1;
51 static int hf_isis_version2 = -1;
52 static int hf_isis_reserved = -1;
53 static int hf_isis_max_area_adr = -1;
55 static gint ett_isis = -1;
57 static const value_string isis_vals[] = {
58 { ISIS_TYPE_L1_HELLO, "L1 HELLO"},
59 { ISIS_TYPE_L2_HELLO, "L2 HELLO"},
60 { ISIS_TYPE_PTP_HELLO, "P2P HELLO"},
61 { ISIS_TYPE_L1_LSP, "L1 LSP"},
62 { ISIS_TYPE_L2_LSP, "L2 LSP"},
63 { ISIS_TYPE_L1_CSNP, "L1 CSNP"},
64 { ISIS_TYPE_L2_CSNP, "L2 CSNP"},
65 { ISIS_TYPE_L1_PSNP, "L1 PSNP"},
66 { ISIS_TYPE_L2_PSNP, "L2 PSNP"},
70 * Name: isis_dissect_unknown()
73 * There was some error in the protocol and we are in unknown space
74 * here. Add a tree item to cover the error and go on. Note
75 * that we make sure we don't go off the end of the bleedin packet here!
78 * tvbuff_t * : tvbuffer for packet data
79 * proto_tree * : tree of display data. May be NULL.
80 * int : current offset into packet data
81 * char * : format text
82 * subsequent args : arguments to format
85 * void (may modify proto tree)
88 isis_dissect_unknown(tvbuff_t *tvb, proto_tree *tree, int offset,
94 proto_tree_add_text_valist(tree, tvb, offset, -1, fmat, ap);
99 * Name: dissect_isis()
102 * Main entry area for isis de-mangling. This will build the
103 * main isis tree data and call the sub-protocols as needed.
106 * tvbuff_t * : tvbuffer for packet data
107 * packet_info * : info for current packet
108 * proto_tree * : tree of display data. May be NULL.
111 * void, but we will add to the proto_tree if it is not NULL.
114 dissect_isis(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
117 proto_tree *isis_tree = NULL;
120 guint8 isis_header_length;
121 guint8 isis_type_reserved;
123 guint8 isis_system_id_len;
125 if (check_col(pinfo->cinfo, COL_PROTOCOL))
126 col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISIS");
127 if (check_col(pinfo->cinfo, COL_INFO))
128 col_clear(pinfo->cinfo, COL_INFO);
130 isis_version = tvb_get_guint8(tvb, 2);
131 if (isis_version != ISIS_REQUIRED_VERSION){
132 if (check_col(pinfo->cinfo, COL_INFO)) {
133 col_add_fstr(pinfo->cinfo, COL_INFO,
134 "Unknown ISIS version (%u vs %u)",
135 isis_version, ISIS_REQUIRED_VERSION );
137 isis_dissect_unknown(tvb, tree, 0,
138 "Unknown ISIS version (%d vs %d)",
139 isis_version, ISIS_REQUIRED_VERSION);
144 ti = proto_tree_add_item(tree, proto_isis, tvb, 0, -1, FALSE);
145 isis_tree = proto_item_add_subtree(ti, ett_isis);
149 proto_tree_add_item(isis_tree, hf_isis_irpd, tvb, offset, 1,
154 isis_header_length = tvb_get_guint8(tvb, offset);
156 proto_tree_add_uint(isis_tree, hf_isis_header_length, tvb,
157 offset, 1, isis_header_length );
162 proto_tree_add_uint(isis_tree, hf_isis_version, tvb,
163 offset, 1, isis_version );
167 isis_system_id_len = tvb_get_guint8(tvb, offset);
169 proto_tree_add_uint(isis_tree, hf_isis_system_id_length, tvb,
170 offset, 1, isis_system_id_len );
174 isis_type_reserved = tvb_get_guint8(tvb, offset);
175 isis_type = isis_type_reserved & ISIS_TYPE_MASK;
176 if (check_col(pinfo->cinfo, COL_INFO)) {
177 col_add_str(pinfo->cinfo, COL_INFO,
178 val_to_str ( isis_type, isis_vals, "Unknown (0x%x)" ) );
181 proto_tree_add_uint_format(isis_tree, hf_isis_type, tvb,
182 offset, 1, isis_type,
183 "PDU Type : %s (R:%s%s%s)",
184 val_to_str(isis_type, isis_vals, "Unknown (0x%x)"),
185 (isis_type_reserved & ISIS_R8_MASK) ? "1" : "0",
186 (isis_type_reserved & ISIS_R7_MASK) ? "1" : "0",
187 (isis_type_reserved & ISIS_R6_MASK) ? "1" : "0");
192 proto_tree_add_item(isis_tree, hf_isis_version2, tvb, offset, 1,
198 proto_tree_add_item(isis_tree, hf_isis_reserved, tvb, offset, 1,
204 proto_tree_add_item(isis_tree, hf_isis_max_area_adr, tvb, offset, 1,
210 * Interpret the system ID length.
212 if (isis_system_id_len == 0)
213 isis_system_id_len = 6; /* zero means 6-octet ID field length */
214 else if (isis_system_id_len == 255) {
215 isis_system_id_len = 0; /* 255 means null ID field */
216 /* XXX - what about the LAN ID? */
218 /* XXX - otherwise, must be in the range 1 through 8 */
221 case ISIS_TYPE_L1_HELLO:
222 case ISIS_TYPE_L2_HELLO:
223 case ISIS_TYPE_PTP_HELLO:
224 isis_dissect_isis_hello(tvb, pinfo, isis_tree, offset,
225 isis_type, isis_header_length, isis_system_id_len);
227 case ISIS_TYPE_L1_LSP:
228 case ISIS_TYPE_L2_LSP:
229 isis_dissect_isis_lsp(tvb, pinfo, isis_tree, offset,
230 isis_type, isis_header_length, isis_system_id_len);
232 case ISIS_TYPE_L1_CSNP:
233 case ISIS_TYPE_L2_CSNP:
234 isis_dissect_isis_csnp(tvb, pinfo, isis_tree, offset,
235 isis_type, isis_header_length, isis_system_id_len);
237 case ISIS_TYPE_L1_PSNP:
238 case ISIS_TYPE_L2_PSNP:
239 isis_dissect_isis_psnp(tvb, pinfo, isis_tree, offset,
240 isis_type, isis_header_length, isis_system_id_len);
243 isis_dissect_unknown(tvb, tree, offset,
244 "Unknown ISIS packet type");
250 * Name: proto_register_isis()
253 * main register for isis protocol set. We register some display
254 * formats and the protocol module variables.
256 * NOTE: this procedure to autolinked by the makefile process that
266 proto_register_isis(void) {
267 static hf_register_info hf[] = {
269 { "Intra Domain Routing Protocol Discriminator", "isis.irpd",
270 FT_UINT8, BASE_HEX, VALS(nlpid_vals), 0x0, "", HFILL }},
272 { &hf_isis_header_length,
273 { "PDU Header Length ", "isis.len", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
276 { "Version (==1) ", "isis.version", FT_UINT8,
277 BASE_DEC, NULL, 0x0, "", HFILL }},
279 { &hf_isis_system_id_length,
280 { "System ID Length ", "isis.sysid_len",
281 FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
284 { "PDU Type ", "isis.type", FT_UINT8, BASE_DEC,
285 VALS(isis_vals), 0xff, "", HFILL }},
288 { "Version2 (==1) ", "isis.version2", FT_UINT8, BASE_DEC, NULL,
292 { "Reserved (==0) ", "isis.reserved", FT_UINT8, BASE_DEC, NULL,
295 { &hf_isis_max_area_adr,
296 { "Max.AREAs: (0==3) ", "isis.max_area_adr", FT_UINT8, BASE_DEC, NULL,
301 * Note, we pull in the unknown CLV handler here, since it
302 * is used by all ISIS packet types.
304 static gint *ett[] = {
308 proto_isis = proto_register_protocol(PROTO_STRING_ISIS, "ISIS", "isis");
309 proto_register_field_array(proto_isis, hf, array_length(hf));
310 proto_register_subtree_array(ett, array_length(ett));
313 * Call registration routines for other source files in the ISIS
316 isis_register_hello(proto_isis);
317 isis_register_lsp(proto_isis);
318 isis_register_csnp(proto_isis);
319 isis_register_psnp(proto_isis);
323 proto_reg_handoff_isis(void)
325 dissector_handle_t isis_handle;
327 isis_handle = create_dissector_handle(dissect_isis, proto_isis);
328 dissector_add("osinl", NLPID_ISO10589_ISIS, isis_handle);