487 lines
13 KiB
C
487 lines
13 KiB
C
/* packet-isis-snp.c
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* Routines for decoding isis complete & partial SNP and their payload
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*
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* $Id: packet-isis-snp.c,v 1.2 2000/01/24 03:33:32 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@zing.org>
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* Copyright 1998 Gerald Combs
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*
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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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*
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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 "packet.h"
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#include "packet-isis.h"
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#include "packet-isis-clv.h"
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#include "packet-isis-lsp.h"
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#include "packet-isis-snp.h"
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/* csnp packets */
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static int proto_isis_csnp = -1;
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static int hf_isis_csnp_pdu_length = -1;
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static gint ett_isis_csnp = -1;
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static gint ett_isis_csnp_lsp_entries = -1;
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static gint ett_isis_csnp_authentication = -1;
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static gint ett_isis_csnp_clv_unknown = -1;
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/* psnp packets */
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static int proto_isis_psnp = -1;
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static int hf_isis_psnp_pdu_length = -1;
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static gint ett_isis_psnp = -1;
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static gint ett_isis_psnp_lsp_entries = -1;
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static gint ett_isis_psnp_authentication = -1;
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static gint ett_isis_psnp_clv_unknown = -1;
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static void dissect_snp_lsp_entries(const u_char *pd, int offset,
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guint length, frame_data *fd, proto_tree *tree );
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static void dissect_l1_snp_authentication_clv(const u_char *pd, int offset,
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guint length, frame_data *fd, proto_tree *tree );
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static void dissect_l2_snp_authentication_clv(const u_char *pd, int offset,
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guint length, frame_data *fd, proto_tree *tree );
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static const isis_clv_handle_t clv_l1_csnp_opts[] = {
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{
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ISIS_CLV_L1_CSNP_LSP_ENTRIES,
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"LSP entries",
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&ett_isis_csnp_lsp_entries,
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dissect_snp_lsp_entries
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},
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{
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ISIS_CLV_L1_CSNP_AUTHENTICATION_NS,
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"Authentication(non spec)",
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&ett_isis_csnp_authentication,
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dissect_l1_snp_authentication_clv
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},
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{
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ISIS_CLV_L1_CSNP_AUTHENTICATION,
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"Authentication",
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&ett_isis_csnp_authentication,
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dissect_l1_snp_authentication_clv
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},
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{
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0, "", NULL, NULL
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}
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};
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static const isis_clv_handle_t clv_l2_csnp_opts[] = {
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{
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ISIS_CLV_L2_CSNP_LSP_ENTRIES,
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"LSP entries",
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&ett_isis_csnp_lsp_entries,
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dissect_snp_lsp_entries
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},
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{
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ISIS_CLV_L2_CSNP_AUTHENTICATION_NS,
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"Authentication(non spec)",
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&ett_isis_csnp_authentication,
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dissect_l2_snp_authentication_clv
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},
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{
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ISIS_CLV_L2_CSNP_AUTHENTICATION,
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"Authentication",
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&ett_isis_csnp_authentication,
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dissect_l2_snp_authentication_clv
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},
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{
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0, "", NULL, NULL
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}
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};
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static const isis_clv_handle_t clv_l1_psnp_opts[] = {
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{
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ISIS_CLV_L1_PSNP_LSP_ENTRIES,
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"LSP entries",
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&ett_isis_psnp_lsp_entries,
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dissect_snp_lsp_entries
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},
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{
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ISIS_CLV_L1_PSNP_AUTHENTICATION_NS,
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"Authentication(non spec)",
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&ett_isis_psnp_authentication,
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dissect_l1_snp_authentication_clv
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},
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{
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ISIS_CLV_L1_PSNP_AUTHENTICATION,
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"Authentication",
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&ett_isis_psnp_authentication,
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dissect_l1_snp_authentication_clv
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},
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{
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0, "", NULL, NULL
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}
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};
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static const isis_clv_handle_t clv_l2_psnp_opts[] = {
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{
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ISIS_CLV_L2_PSNP_LSP_ENTRIES,
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"LSP entries",
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&ett_isis_psnp_lsp_entries,
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dissect_snp_lsp_entries
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},
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{
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ISIS_CLV_L2_PSNP_AUTHENTICATION,
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"Authentication",
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&ett_isis_psnp_authentication,
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dissect_l2_snp_authentication_clv
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},
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{
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ISIS_CLV_L2_PSNP_AUTHENTICATION_NS,
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"Authentication(non spec)",
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&ett_isis_psnp_authentication,
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dissect_l2_snp_authentication_clv
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},
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{
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0, "", NULL, NULL
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}
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};
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/*
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* Name: dissect_snp_payload()
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*
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* Description:
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* All the snp packets use a common payload format. We have up
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* to n entries (based on length), which are made of:
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* 2 : remaining life time
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* 8 : lsp id
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* 4 : sequence number
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* 2 : checksum
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*
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* Input:
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* u_char * : packet data
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* int : offset into packet data where we are.
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* int : length of payload to decode.
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* frame_data * : frame data (complete frame)
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* proto_tree * : protocol display tree to fill out. May be NULL
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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static void
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dissect_snp_lsp_entries(const u_char *pd, int offset, guint length,
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frame_data *fd, proto_tree *tree ) {
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isis_snp_t *ps;
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ps = (isis_snp_t *) &pd[offset];
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while ( length > 0 ) {
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if ( length < sizeof(isis_psnp_t) ) {
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isis_dissect_unknown(offset, length, tree, fd,
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"Short SNP header entry (%d vs %d)", length,
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sizeof(isis_psnp_t) );
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return;
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}
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proto_tree_add_text(tree, offset, 2, "Remaining life: %d",
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pntohs(&ps->isis_snp_remaining_lifetime));
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isis_lsp_decode_lsp_id( "LSP ID", tree, offset + 2,
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&ps->isis_snp_lsp_id );
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proto_tree_add_text(tree, offset+10, 4,
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"LSP Sequence Number: 0x%04x",
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pntohl(&ps->isis_snp_sequence_number));
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proto_tree_add_text(tree, offset+14, 2,
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"LSP checksum: 0x%02x",
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pntohl(&ps->isis_snp_checksum));
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length -= sizeof ( isis_snp_t );
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offset += sizeof ( isis_snp_t );
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ps++;
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}
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}
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/*
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* Name: isis_dissect_isis_csnp()
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*
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* Description:
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* Tear apart a L1 or L2 CSNP header and then call into payload dissect
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* to pull apart the lsp id payload.
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*
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* Input:
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* int : type (l1 csnp, l2 csnp)
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* u_char * : packet data
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* int : offset into packet data where we are.
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* guint : length of clv we are decoding
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* frame_data * : frame data (complete frame)
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* proto_tree * : protocol display tree to fill out. May be NULL
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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void
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isis_dissect_isis_csnp(int type, int header_length, const u_char *pd,
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int offset, frame_data *fd, proto_tree *tree){
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isis_csnp_t *ilp;
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proto_item *ti;
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proto_tree *csnp_tree = NULL;
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int hlen;
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int len;
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hlen = sizeof(*ilp);
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if (!BYTES_ARE_IN_FRAME(offset, hlen)) {
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isis_dissect_unknown(offset, hlen, tree, fd,
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"not enough capture data for header (%d vs %d)",
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hlen, END_OF_FRAME);
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return;
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}
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ilp = (isis_csnp_t *) &pd[offset];
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if (tree) {
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ti = proto_tree_add_item(tree, proto_isis_csnp,
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offset, END_OF_FRAME, NULL);
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csnp_tree = proto_item_add_subtree(ti, ett_isis_csnp);
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proto_tree_add_item(csnp_tree, hf_isis_csnp_pdu_length,
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offset, 2, pntohs(&ilp->isis_csnp_pdu_length));
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proto_tree_add_text(csnp_tree, offset + 2, 7,
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"Source id: %02x%02x.%02x%02x.%02x%02x.%02x",
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ilp->isis_csnp_source_id[0],
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ilp->isis_csnp_source_id[1],
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ilp->isis_csnp_source_id[2],
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ilp->isis_csnp_source_id[3],
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ilp->isis_csnp_source_id[4],
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ilp->isis_csnp_source_id[5],
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ilp->isis_csnp_source_id[6] );
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isis_lsp_decode_lsp_id( "Start LSP id", csnp_tree, offset + 9,
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&ilp->isis_csnp_start_lsp_id );
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isis_lsp_decode_lsp_id( "End LSP id", csnp_tree, offset + 17,
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&ilp->isis_csnp_start_lsp_id );
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}
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offset += hlen;
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len = pntohs(&ilp->isis_csnp_pdu_length);
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len -= header_length;
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if (len < 0) {
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return;
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}
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/* Call into payload dissector */
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if (type == ISIS_TYPE_L1_CSNP ) {
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isis_dissect_clvs ( clv_l1_csnp_opts, len, pd, offset, fd,
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csnp_tree, ett_isis_csnp_clv_unknown );
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} else {
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isis_dissect_clvs ( clv_l2_csnp_opts, len, pd, offset, fd,
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csnp_tree, ett_isis_csnp_clv_unknown );
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}
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}
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/*
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* Name: isis_dissect_isis_psnp()
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*
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* Description:
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* Tear apart a L1 or L2 PSNP header and then call into payload dissect
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* to pull apart the lsp id payload.
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*
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* Input:
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* u_char * : packet data
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* int : offset into packet data where we are.
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* guint : length of clv we are decoding
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* frame_data * : frame data (complete frame)
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* proto_tree * : protocol display tree to fill out. May be NULL
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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void
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isis_dissect_isis_psnp(int type, int header_length, const u_char *pd,
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int offset, frame_data *fd, proto_tree *tree){
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isis_psnp_t *ilp;
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proto_item *ti;
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proto_tree *psnp_tree = NULL;
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int hlen;
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int len;
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hlen = sizeof(*ilp);
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if (!BYTES_ARE_IN_FRAME(offset, hlen)) {
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isis_dissect_unknown(offset, hlen, tree, fd,
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"not enough capture data for header (%d vs %d)",
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hlen, END_OF_FRAME);
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return;
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}
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ilp = (isis_psnp_t *) &pd[offset];
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if (tree) {
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ti = proto_tree_add_item(tree, proto_isis_psnp,
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offset, END_OF_FRAME, NULL);
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psnp_tree = proto_item_add_subtree(ti, ett_isis_psnp);
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proto_tree_add_item(psnp_tree, hf_isis_psnp_pdu_length,
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offset, 2, pntohs(&ilp->isis_psnp_pdu_length));
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proto_tree_add_text(psnp_tree, offset + 2, 7,
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"Source id: %02x%02x.%02x%02x.%02x%02x.%02x",
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ilp->isis_psnp_source_id[0],
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ilp->isis_psnp_source_id[1],
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ilp->isis_psnp_source_id[2],
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ilp->isis_psnp_source_id[3],
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ilp->isis_psnp_source_id[4],
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ilp->isis_psnp_source_id[5],
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ilp->isis_psnp_source_id[6] );
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}
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offset += hlen;
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len = pntohs(&ilp->isis_psnp_pdu_length);
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len -= header_length;
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if (len < 0) {
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isis_dissect_unknown(offset, header_length, tree, fd,
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"packet header length %d went beyond packet",
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header_length );
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return;
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}
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/* Call into payload dissector */
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if (type == ISIS_TYPE_L1_CSNP ) {
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isis_dissect_clvs ( clv_l1_csnp_opts, len, pd, offset, fd,
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psnp_tree, ett_isis_psnp_clv_unknown );
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} else {
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isis_dissect_clvs ( clv_l2_csnp_opts, len, pd, offset, fd,
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psnp_tree, ett_isis_psnp_clv_unknown );
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}
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}
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/*
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* Name: dissect_L1_snp_authentication_clv()
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*
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* Description:
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* Decode for a lsp packets authenticaion clv. Calls into the
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* clv common one. An auth inside a L1 SNP is a per area password
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*
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* Input:
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* u_char * : packet data
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* int : current offset into packet data
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* guint : length of this clv
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* frame_data * : frame data
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* proto_tree * : proto tree to build on (may be null)
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*
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* Output:
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* void, will modify proto_tree if not null.
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*/
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static void
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dissect_l1_snp_authentication_clv(const u_char *pd, int offset,
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guint length, frame_data *fd, proto_tree *tree) {
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isis_dissect_authentication_clv(pd, offset, length, fd, tree,
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"Per area authentication" );
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}
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/*
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* Name: dissect_l2_authentication_clv()
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*
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* Description:
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* Decode for a lsp packets authenticaion clv. Calls into the
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* clv common one. An auth inside a L2 LSP is a per domain password
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*
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* Input:
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* u_char * : packet data
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* int : current offset into packet data
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* guint : length of this clv
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* frame_data * : frame data
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* proto_tree * : proto tree to build on (may be null)
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*
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* Output:
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* void, will modify proto_tree if not null.
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*/
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static void
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dissect_l2_snp_authentication_clv(const u_char *pd, int offset,
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guint length, frame_data *fd, proto_tree *tree) {
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isis_dissect_authentication_clv(pd, offset, length, fd, tree,
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"Per domain authentication" );
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}
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/*
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* Name: proto_register_isis_csnp()
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*
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* Description:
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* Register our protocol sub-sets with protocol manager.
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* NOTE: this procedure is 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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* u_char * : packet data
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* int : offset into packet data where we are.
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* guint : length of clv we are decoding
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* frame_data * : frame data (complete frame)
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* proto_tree * : protocol display tree to fill out. May be NULL
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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void
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proto_register_isis_csnp(void) {
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static hf_register_info hf[] = {
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{ &hf_isis_csnp_pdu_length,
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{ "PDU length", "isis_csnp.pdu_length", FT_UINT16,
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BASE_DEC, NULL, 0x0, "" }},
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};
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static gint *ett[] = {
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&ett_isis_csnp,
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&ett_isis_csnp_lsp_entries,
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&ett_isis_csnp_authentication,
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&ett_isis_csnp_clv_unknown,
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};
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proto_isis_csnp = proto_register_protocol("ISIS csnp", "ISIS-csnp");
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proto_register_field_array(proto_isis_csnp, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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/*
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* Name: proto_register_isis_psnp()
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*
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* Description:
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* Register our protocol sub-sets with protocol manager.
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* NOTE: this procedure is 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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* u_char * : packet data
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* int : offset into packet data where we are.
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* guint : length of clv we are decoding
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* frame_data * : frame data (complete frame)
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* proto_tree * : protocol display tree to fill out. May be NULL
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*
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* Output:
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* void, but we will add to proto tree if !NULL.
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*/
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void
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proto_register_isis_psnp(void) {
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static hf_register_info hf[] = {
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{ &hf_isis_psnp_pdu_length,
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{ "PDU length", "isis_psnp.pdu_length", FT_UINT16,
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BASE_DEC, NULL, 0x0, "" }},
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};
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static gint *ett[] = {
|
|
&ett_isis_psnp,
|
|
&ett_isis_psnp_lsp_entries,
|
|
&ett_isis_psnp_authentication,
|
|
&ett_isis_psnp_clv_unknown,
|
|
};
|
|
|
|
proto_isis_psnp = proto_register_protocol("ISIS psnp", "ISIS-psnp");
|
|
proto_register_field_array(proto_isis_psnp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|