5a89b3b965
svn path=/trunk/; revision=5112
334 lines
9 KiB
C
334 lines
9 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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* $Id: packet-isis.c,v 1.31 2002/04/07 22:36:55 guy Exp $
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* Stuart Stanley <stuarts@mxmail.net>
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include "nlpid.h"
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#include "packet-osi.h"
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#include "packet-isis.h"
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#include "packet-isis-lsp.h"
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#include "packet-isis-hello.h"
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#include "packet-isis-snp.h"
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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_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 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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/*
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* Name: dissect_isis_unknown()
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*
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* Description:
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* There was some error in the protocol and we are in unknown space
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* here. Add a tree item to cover the error and go on. Note
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* that we make sure we don't go off the end of the bleedin packet here!
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*
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* Input
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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : tree of display data. May be NULL.
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* int : current offset into packet data
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* char * : format text
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* subsequent args : arguments to format
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*
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* Output:
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* void (may modify proto tree)
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*/
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void
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isis_dissect_unknown(tvbuff_t *tvb, proto_tree *tree, int offset,
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char *fmat, ...)
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{
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va_list ap;
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va_start(ap, fmat);
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proto_tree_add_text_valist(tree, tvb, offset, -1, fmat, ap);
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va_end(ap);
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}
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/*
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* Name: dissect_isis()
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*
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* Description:
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* Main entry area for isis de-mangling. This will build the
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* main isis tree data and call the sub-protocols as needed.
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*
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* Input:
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* tvbuff_t * : tvbuffer for packet data
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* packet_info * : info for current packet
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* proto_tree * : tree of display data. May be NULL.
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*
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* Output:
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* void, but we will add to the proto_tree if it is not NULL.
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*/
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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;
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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_header_length;
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guint8 isis_type_reserved;
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guint8 isis_type;
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guint8 isis_system_id_len;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISIS");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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isis_version = tvb_get_guint8(tvb, 2);
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if (isis_version != ISIS_REQUIRED_VERSION){
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if (check_col(pinfo->cinfo, COL_INFO)) {
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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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}
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isis_dissect_unknown(tvb, tree, 0,
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"Unknown ISIS version (%d vs %d)",
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isis_version, ISIS_REQUIRED_VERSION);
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return;
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}
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isis_header_length = tvb_get_guint8(tvb, 1);
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if (tree) {
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ti = proto_tree_add_item(tree, proto_isis, tvb, 0, -1, FALSE);
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isis_tree = proto_item_add_subtree(ti, ett_isis);
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}
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if (tree) {
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proto_tree_add_item(isis_tree, hf_isis_irpd, tvb, offset, 1,
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FALSE );
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}
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offset += 1;
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if (tree) {
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proto_tree_add_uint(isis_tree, hf_isis_header_length, tvb,
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offset, 1, isis_header_length );
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}
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offset += 1;
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if (tree) {
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proto_tree_add_uint(isis_tree, hf_isis_version, tvb,
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offset, 1, isis_version );
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}
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offset += 1;
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isis_system_id_len = tvb_get_guint8(tvb, 3);
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if (tree) {
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proto_tree_add_uint(isis_tree, hf_isis_system_id_length, tvb,
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offset, 1, isis_system_id_len );
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}
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offset += 1;
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isis_type_reserved = tvb_get_guint8(tvb, 4);
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isis_type = isis_type_reserved & ISIS_TYPE_MASK;
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if (check_col(pinfo->cinfo, COL_INFO)) {
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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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}
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if (tree) {
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proto_tree_add_uint_format(isis_tree, hf_isis_type, tvb,
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offset, 1, isis_type,
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"PDU Type : %s (R:%s%s%s)",
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val_to_str(isis_type, isis_vals, "Unknown (0x%x)"),
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(isis_type_reserved & ISIS_R8_MASK) ? "1" : "0",
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(isis_type_reserved & ISIS_R7_MASK) ? "1" : "0",
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(isis_type_reserved & ISIS_R6_MASK) ? "1" : "0");
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}
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offset += 1;
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if (tree) {
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proto_tree_add_item(isis_tree, hf_isis_version2, tvb, 5, 1,
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FALSE );
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}
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offset += 1;
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if (tree) {
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proto_tree_add_item(isis_tree, hf_isis_reserved, tvb, 6, 1,
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FALSE );
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}
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offset += 1;
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if (tree) {
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proto_tree_add_item(isis_tree, hf_isis_max_area_adr, tvb, 7, 1,
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FALSE );
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}
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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 (isis_system_id_len == 0)
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isis_system_id_len = 6; /* zero means 6-octet ID field length */
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else if (isis_system_id_len == 255) {
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isis_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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switch (isis_type) {
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case ISIS_TYPE_L1_HELLO:
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case ISIS_TYPE_L2_HELLO:
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case ISIS_TYPE_PTP_HELLO:
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isis_dissect_isis_hello(tvb, isis_tree, offset,
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isis_type, isis_header_length, isis_system_id_len);
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break;
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case ISIS_TYPE_L1_LSP:
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case ISIS_TYPE_L2_LSP:
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isis_dissect_isis_lsp(tvb, isis_tree, offset,
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isis_type, isis_header_length, isis_system_id_len);
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break;
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case ISIS_TYPE_L1_CSNP:
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case ISIS_TYPE_L2_CSNP:
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isis_dissect_isis_csnp(tvb, isis_tree, offset,
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isis_type, isis_header_length, isis_system_id_len);
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break;
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case ISIS_TYPE_L1_PSNP:
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case ISIS_TYPE_L2_PSNP:
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isis_dissect_isis_psnp(tvb, isis_tree, offset,
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isis_type, isis_header_length, isis_system_id_len);
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break;
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default:
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isis_dissect_unknown(tvb, tree, offset,
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"Unknown ISIS packet type");
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}
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} /* dissect_isis */
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/*
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* Name: proto_register_isis()
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*
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* Description:
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* main register for isis protocol set. We register some display
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* formats and the protocol module variables.
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*
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* NOTE: this procedure to autolinked by the makefile process that
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* builds register.c
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*
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* Input:
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* void
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*
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* Output:
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* void
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*/
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void
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proto_register_isis(void) {
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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, "", HFILL }},
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{ &hf_isis_header_length,
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{ "PDU Header Length ", "isis.len", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }},
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{ &hf_isis_version,
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{ "Version (==1) ", "isis.version", FT_UINT8,
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BASE_DEC, NULL, 0x0, "", 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, "", 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), 0xff, "", 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, "", 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, "", 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, "", 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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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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/*
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* Call registration routines for other source files in the ISIS
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* dissector.
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*/
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isis_register_hello(proto_isis);
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isis_register_lsp(proto_isis);
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isis_register_csnp(proto_isis);
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isis_register_psnp(proto_isis);
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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_handle_t isis_handle;
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isis_handle = create_dissector_handle(dissect_isis, proto_isis);
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dissector_add("osinl", NLPID_ISO10589_ISIS, isis_handle);
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}
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