2 * Routines for ISO/OSI network and transport protocol packet disassembly, core
6 * Stuart Stanley <stuarts@mxmail.net>
8 * Wireshark - Network traffic analyzer
9 * By Gerald Combs <gerald@wireshark.org>
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
32 #include <epan/packet.h>
33 #include <epan/nlpid.h>
34 #include <epan/etypes.h>
35 #include "packet-osi.h"
36 #include "packet-isis.h"
37 #include "packet-isis-lsp.h"
38 #include "packet-isis-hello.h"
39 #include "packet-isis-snp.h"
42 /* isis base header */
43 static int proto_isis = -1;
45 static int hf_isis_irpd = -1;
46 static int hf_isis_header_length = -1;
47 static int hf_isis_version = -1;
48 static int hf_isis_system_id_length = -1;
49 static int hf_isis_type = -1;
50 static int hf_isis_version2 = -1;
51 static int hf_isis_reserved = -1;
52 static int hf_isis_max_area_adr = -1;
54 static gint ett_isis = -1;
56 static const value_string isis_vals[] = {
57 { ISIS_TYPE_L1_HELLO, "L1 HELLO"},
58 { ISIS_TYPE_L2_HELLO, "L2 HELLO"},
59 { ISIS_TYPE_PTP_HELLO, "P2P HELLO"},
60 { ISIS_TYPE_L1_LSP, "L1 LSP"},
61 { ISIS_TYPE_L2_LSP, "L2 LSP"},
62 { ISIS_TYPE_L1_CSNP, "L1 CSNP"},
63 { ISIS_TYPE_L2_CSNP, "L2 CSNP"},
64 { ISIS_TYPE_L1_PSNP, "L1 PSNP"},
65 { ISIS_TYPE_L2_PSNP, "L2 PSNP"},
69 * Name: isis_dissect_unknown()
72 * There was some error in the protocol and we are in unknown space
73 * here. Add a tree item to cover the error and go on. Note
74 * that we make sure we don't go off the end of the bleedin packet here!
77 * tvbuff_t * : tvbuffer for packet data
78 * proto_tree * : tree of display data. May be NULL.
79 * int : current offset into packet data
80 * char * : format text
81 * subsequent args : arguments to format
84 * void (may modify proto tree)
87 isis_dissect_unknown(tvbuff_t *tvb, proto_tree *tree, int offset,
88 const char *fmat, ...)
93 proto_tree_add_text_valist(tree, tvb, offset, -1, fmat, ap);
98 * Name: dissect_isis()
101 * Main entry area for isis de-mangling. This will build the
102 * main isis tree data and call the sub-protocols as needed.
105 * tvbuff_t * : tvbuffer for packet data
106 * packet_info * : info for current packet
107 * proto_tree * : tree of display data. May be NULL.
110 * void, but we will add to the proto_tree if it is not NULL.
113 dissect_isis(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
116 proto_tree *isis_tree = NULL;
119 guint8 isis_header_length;
120 guint8 isis_type_reserved;
122 guint8 isis_system_id_len;
124 col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISIS");
125 col_clear(pinfo->cinfo, COL_INFO);
127 isis_version = tvb_get_guint8(tvb, 2);
128 if (isis_version != ISIS_REQUIRED_VERSION){
129 if (check_col(pinfo->cinfo, COL_INFO)) {
130 col_add_fstr(pinfo->cinfo, COL_INFO,
131 "Unknown ISIS version (%u vs %u)",
132 isis_version, ISIS_REQUIRED_VERSION );
134 isis_dissect_unknown(tvb, tree, 0,
135 "Unknown ISIS version (%d vs %d)",
136 isis_version, ISIS_REQUIRED_VERSION);
141 ti = proto_tree_add_item(tree, proto_isis, tvb, 0, -1, ENC_NA);
142 isis_tree = proto_item_add_subtree(ti, ett_isis);
146 proto_tree_add_item(isis_tree, hf_isis_irpd, tvb, offset, 1,
151 isis_header_length = tvb_get_guint8(tvb, offset);
153 proto_tree_add_uint(isis_tree, hf_isis_header_length, tvb,
154 offset, 1, isis_header_length );
159 proto_tree_add_uint(isis_tree, hf_isis_version, tvb,
160 offset, 1, isis_version );
164 isis_system_id_len = tvb_get_guint8(tvb, offset);
166 proto_tree_add_uint(isis_tree, hf_isis_system_id_length, tvb,
167 offset, 1, isis_system_id_len );
171 isis_type_reserved = tvb_get_guint8(tvb, offset);
172 isis_type = isis_type_reserved & ISIS_TYPE_MASK;
173 if (check_col(pinfo->cinfo, COL_INFO)) {
174 col_add_str(pinfo->cinfo, COL_INFO,
175 val_to_str ( isis_type, isis_vals, "Unknown (0x%x)" ) );
178 proto_tree_add_uint_format(isis_tree, hf_isis_type, tvb,
179 offset, 1, isis_type,
180 "PDU Type : %s (R:%s%s%s)",
181 val_to_str(isis_type, isis_vals, "Unknown (0x%x)"),
182 (isis_type_reserved & ISIS_R8_MASK) ? "1" : "0",
183 (isis_type_reserved & ISIS_R7_MASK) ? "1" : "0",
184 (isis_type_reserved & ISIS_R6_MASK) ? "1" : "0");
189 proto_tree_add_item(isis_tree, hf_isis_version2, tvb, offset, 1,
195 proto_tree_add_item(isis_tree, hf_isis_reserved, tvb, offset, 1,
201 proto_tree_add_item(isis_tree, hf_isis_max_area_adr, tvb, offset, 1,
207 * Interpret the system ID length.
209 if (isis_system_id_len == 0)
210 isis_system_id_len = 6; /* zero means 6-octet ID field length */
211 else if (isis_system_id_len == 255) {
212 isis_system_id_len = 0; /* 255 means null ID field */
213 /* XXX - what about the LAN ID? */
215 /* XXX - otherwise, must be in the range 1 through 8 */
218 case ISIS_TYPE_L1_HELLO:
219 case ISIS_TYPE_L2_HELLO:
220 case ISIS_TYPE_PTP_HELLO:
221 isis_dissect_isis_hello(tvb, pinfo, isis_tree, offset,
222 isis_type, isis_header_length, isis_system_id_len);
224 case ISIS_TYPE_L1_LSP:
225 case ISIS_TYPE_L2_LSP:
226 isis_dissect_isis_lsp(tvb, pinfo, isis_tree, offset,
227 isis_type, isis_header_length, isis_system_id_len);
229 case ISIS_TYPE_L1_CSNP:
230 case ISIS_TYPE_L2_CSNP:
231 isis_dissect_isis_csnp(tvb, pinfo, isis_tree, offset,
232 isis_type, isis_header_length, isis_system_id_len);
234 case ISIS_TYPE_L1_PSNP:
235 case ISIS_TYPE_L2_PSNP:
236 isis_dissect_isis_psnp(tvb, pinfo, isis_tree, offset,
237 isis_type, isis_header_length, isis_system_id_len);
240 isis_dissect_unknown(tvb, tree, offset,
241 "Unknown ISIS packet type");
247 * Name: proto_register_isis()
250 * main register for isis protocol set. We register some display
251 * formats and the protocol module variables.
253 * NOTE: this procedure to autolinked by the makefile process that
263 proto_register_isis(void) {
264 static hf_register_info hf[] = {
266 { "Intra Domain Routing Protocol Discriminator", "isis.irpd",
267 FT_UINT8, BASE_HEX, VALS(nlpid_vals), 0x0, NULL, HFILL }},
269 { &hf_isis_header_length,
270 { "PDU Header Length", "isis.len", FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
273 { "Version (==1)", "isis.version", FT_UINT8,
274 BASE_DEC, NULL, 0x0, NULL, HFILL }},
276 { &hf_isis_system_id_length,
277 { "System ID Length", "isis.sysid_len",
278 FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
281 { "PDU Type", "isis.type", FT_UINT8, BASE_DEC,
282 VALS(isis_vals), 0xff, NULL, HFILL }},
285 { "Version2 (==1)", "isis.version2", FT_UINT8, BASE_DEC, NULL,
289 { "Reserved (==0)", "isis.reserved", FT_UINT8, BASE_DEC, NULL,
292 { &hf_isis_max_area_adr,
293 { "Max.AREAs: (0==3)", "isis.max_area_adr", FT_UINT8, BASE_DEC, NULL,
298 * Note, we pull in the unknown CLV handler here, since it
299 * is used by all ISIS packet types.
301 static gint *ett[] = {
305 proto_isis = proto_register_protocol(PROTO_STRING_ISIS, "ISIS", "isis");
306 proto_register_field_array(proto_isis, hf, array_length(hf));
307 proto_register_subtree_array(ett, array_length(ett));
309 register_dissector("isis", dissect_isis, proto_isis);
312 * Call registration routines for other source files in the ISIS
315 isis_register_hello(proto_isis);
316 isis_register_lsp(proto_isis);
317 isis_register_csnp(proto_isis);
318 isis_register_psnp(proto_isis);
322 proto_reg_handoff_isis(void)
324 dissector_handle_t isis_handle;
326 isis_handle = create_dissector_handle(dissect_isis, proto_isis);
327 dissector_add_uint("osinl", NLPID_ISO10589_ISIS, isis_handle);
328 dissector_add_uint("ethertype", ETHERTYPE_L2ISIS, isis_handle);