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-rw-r--r--epan/dissectors/packet-isis.c329
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diff --git a/epan/dissectors/packet-isis.c b/epan/dissectors/packet-isis.c
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+/* packet-isis.c
+ * Routines for ISO/OSI network and transport protocol packet disassembly, core
+ * bits.
+ *
+ * $Id$
+ * Stuart Stanley <stuarts@mxmail.net>
+ *
+ * Ethereal - Network traffic analyzer
+ * By Gerald Combs <gerald@ethereal.com>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stdio.h>
+#include <string.h>
+#include <glib.h>
+#include <epan/packet.h>
+#include "nlpid.h"
+#include "packet-osi.h"
+#include "packet-isis.h"
+#include "packet-isis-lsp.h"
+#include "packet-isis-hello.h"
+#include "packet-isis-snp.h"
+
+
+/* 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_version2 = -1;
+static int hf_isis_reserved = -1;
+static int hf_isis_max_area_adr = -1;
+
+static gint ett_isis = -1;
+
+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} };
+
+/*
+ * Name: isis_dissect_unknown()
+ *
+ * Description:
+ * There was some error in the protocol and we are in unknown space
+ * here. Add a tree item to cover the error and go on. Note
+ * that we make sure we don't go off the end of the bleedin packet here!
+ *
+ * Input
+ * tvbuff_t * : tvbuffer for packet data
+ * proto_tree * : tree of display data. May be NULL.
+ * int : current offset into packet data
+ * char * : format text
+ * subsequent args : arguments to format
+ *
+ * Output:
+ * void (may modify proto tree)
+ */
+void
+isis_dissect_unknown(tvbuff_t *tvb, proto_tree *tree, int offset,
+ char *fmat, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmat);
+ proto_tree_add_text_valist(tree, tvb, offset, -1, fmat, ap);
+ va_end(ap);
+}
+
+/*
+ * Name: dissect_isis()
+ *
+ * Description:
+ * Main entry area for isis de-mangling. This will build the
+ * main isis tree data and call the sub-protocols as needed.
+ *
+ * Input:
+ * tvbuff_t * : tvbuffer for packet data
+ * packet_info * : info for current packet
+ * proto_tree * : tree of display data. May be NULL.
+ *
+ * Output:
+ * void, but we will add to the proto_tree if it is not NULL.
+ */
+static void
+dissect_isis(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+ proto_item *ti;
+ proto_tree *isis_tree = NULL;
+ int offset = 0;
+ guint8 isis_version;
+ guint8 isis_header_length;
+ guint8 isis_type_reserved;
+ guint8 isis_type;
+ guint8 isis_system_id_len;
+
+ if (check_col(pinfo->cinfo, COL_PROTOCOL))
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISIS");
+ if (check_col(pinfo->cinfo, COL_INFO))
+ col_clear(pinfo->cinfo, COL_INFO);
+
+ isis_version = tvb_get_guint8(tvb, 2);
+ if (isis_version != ISIS_REQUIRED_VERSION){
+ if (check_col(pinfo->cinfo, COL_INFO)) {
+ col_add_fstr(pinfo->cinfo, COL_INFO,
+ "Unknown ISIS version (%u vs %u)",
+ isis_version, ISIS_REQUIRED_VERSION );
+ }
+ isis_dissect_unknown(tvb, tree, 0,
+ "Unknown ISIS version (%d vs %d)",
+ isis_version, ISIS_REQUIRED_VERSION);
+ return;
+ }
+
+ if (tree) {
+ ti = proto_tree_add_item(tree, proto_isis, tvb, 0, -1, FALSE);
+ isis_tree = proto_item_add_subtree(ti, ett_isis);
+ }
+
+ if (tree) {
+ proto_tree_add_item(isis_tree, hf_isis_irpd, tvb, offset, 1,
+ FALSE );
+ }
+ offset += 1;
+
+ isis_header_length = tvb_get_guint8(tvb, offset);
+ if (tree) {
+ proto_tree_add_uint(isis_tree, hf_isis_header_length, tvb,
+ offset, 1, isis_header_length );
+ }
+ offset += 1;
+
+ if (tree) {
+ proto_tree_add_uint(isis_tree, hf_isis_version, tvb,
+ offset, 1, isis_version );
+ }
+ offset += 1;
+
+ isis_system_id_len = tvb_get_guint8(tvb, offset);
+ if (tree) {
+ proto_tree_add_uint(isis_tree, hf_isis_system_id_length, tvb,
+ offset, 1, isis_system_id_len );
+ }
+ offset += 1;
+
+ isis_type_reserved = tvb_get_guint8(tvb, offset);
+ isis_type = isis_type_reserved & ISIS_TYPE_MASK;
+ if (check_col(pinfo->cinfo, COL_INFO)) {
+ col_add_str(pinfo->cinfo, COL_INFO,
+ val_to_str ( isis_type, isis_vals, "Unknown (0x%x)" ) );
+ }
+ if (tree) {
+ proto_tree_add_uint_format(isis_tree, hf_isis_type, tvb,
+ offset, 1, isis_type,
+ "PDU Type : %s (R:%s%s%s)",
+ val_to_str(isis_type, isis_vals, "Unknown (0x%x)"),
+ (isis_type_reserved & ISIS_R8_MASK) ? "1" : "0",
+ (isis_type_reserved & ISIS_R7_MASK) ? "1" : "0",
+ (isis_type_reserved & ISIS_R6_MASK) ? "1" : "0");
+ }
+ offset += 1;
+
+ if (tree) {
+ proto_tree_add_item(isis_tree, hf_isis_version2, tvb, offset, 1,
+ FALSE );
+ }
+ offset += 1;
+
+ if (tree) {
+ proto_tree_add_item(isis_tree, hf_isis_reserved, tvb, offset, 1,
+ FALSE );
+ }
+ offset += 1;
+
+ if (tree) {
+ proto_tree_add_item(isis_tree, hf_isis_max_area_adr, tvb, offset, 1,
+ FALSE );
+ }
+ offset += 1;
+
+ /*
+ * Interpret the system ID length.
+ */
+ if (isis_system_id_len == 0)
+ isis_system_id_len = 6; /* zero means 6-octet ID field length */
+ else if (isis_system_id_len == 255) {
+ isis_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 */
+
+ switch (isis_type) {
+ case ISIS_TYPE_L1_HELLO:
+ case ISIS_TYPE_L2_HELLO:
+ case ISIS_TYPE_PTP_HELLO:
+ isis_dissect_isis_hello(tvb, pinfo, isis_tree, offset,
+ isis_type, isis_header_length, isis_system_id_len);
+ break;
+ case ISIS_TYPE_L1_LSP:
+ case ISIS_TYPE_L2_LSP:
+ isis_dissect_isis_lsp(tvb, pinfo, isis_tree, offset,
+ isis_type, isis_header_length, isis_system_id_len);
+ break;
+ case ISIS_TYPE_L1_CSNP:
+ case ISIS_TYPE_L2_CSNP:
+ isis_dissect_isis_csnp(tvb, pinfo, isis_tree, offset,
+ isis_type, isis_header_length, isis_system_id_len);
+ break;
+ case ISIS_TYPE_L1_PSNP:
+ case ISIS_TYPE_L2_PSNP:
+ isis_dissect_isis_psnp(tvb, pinfo, isis_tree, offset,
+ isis_type, isis_header_length, isis_system_id_len);
+ break;
+ default:
+ isis_dissect_unknown(tvb, tree, offset,
+ "Unknown ISIS packet type");
+ }
+} /* dissect_isis */
+
+
+/*
+ * Name: proto_register_isis()
+ *
+ * Description:
+ * main register for isis protocol set. We register some display
+ * formats and the protocol module variables.
+ *
+ * NOTE: this procedure to autolinked by the makefile process that
+ * builds register.c
+ *
+ * Input:
+ * void
+ *
+ * Output:
+ * void
+ */
+void
+proto_register_isis(void) {
+ static hf_register_info hf[] = {
+ { &hf_isis_irpd,
+ { "Intra Domain Routing Protocol Discriminator", "isis.irpd",
+ FT_UINT8, BASE_HEX, VALS(nlpid_vals), 0x0, "", HFILL }},
+
+ { &hf_isis_header_length,
+ { "PDU Header Length ", "isis.len", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
+
+ { &hf_isis_version,
+ { "Version (==1) ", "isis.version", FT_UINT8,
+ BASE_DEC, NULL, 0x0, "", HFILL }},
+
+ { &hf_isis_system_id_length,
+ { "System ID Length ", "isis.sysid_len",
+ FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
+
+ { &hf_isis_type,
+ { "PDU Type ", "isis.type", FT_UINT8, BASE_DEC,
+ VALS(isis_vals), 0xff, "", HFILL }},
+
+ { &hf_isis_version2,
+ { "Version2 (==1) ", "isis.version2", FT_UINT8, BASE_DEC, NULL,
+ 0x0, "", HFILL }},
+
+ { &hf_isis_reserved,
+ { "Reserved (==0) ", "isis.reserved", FT_UINT8, BASE_DEC, NULL,
+ 0x0, "", HFILL }},
+
+ { &hf_isis_max_area_adr,
+ { "Max.AREAs: (0==3) ", "isis.max_area_adr", FT_UINT8, BASE_DEC, NULL,
+ 0x0, "", HFILL }},
+
+ };
+ /*
+ * Note, we pull in the unknown CLV handler here, since it
+ * is used by all ISIS packet types.
+ */
+ static gint *ett[] = {
+ &ett_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));
+
+ /*
+ * Call registration routines for other source files in the ISIS
+ * dissector.
+ */
+ isis_register_hello(proto_isis);
+ isis_register_lsp(proto_isis);
+ isis_register_csnp(proto_isis);
+ isis_register_psnp(proto_isis);
+}
+
+void
+proto_reg_handoff_isis(void)
+{
+ dissector_handle_t isis_handle;
+
+ isis_handle = create_dissector_handle(dissect_isis, proto_isis);
+ dissector_add("osinl", NLPID_ISO10589_ISIS, isis_handle);
+}
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