![Gilbert Ramirez](/assets/img/avatar_default.png)
Also move ncp222.py, x11-fields, process-x11-fields.pl, make-reg-dotc, and make-reg-dotc.py. Adjust #include lines in files that include packet-*.h files. svn path=/trunk/; revision=11410
596 lines
16 KiB
C
596 lines
16 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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* $Id$
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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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#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 "packet-osi.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 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_clv_lsp_entries = -1;
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static gint ett_isis_csnp_lsp_entry = -1;
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static gint ett_isis_csnp_clv_authentication = -1;
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static gint ett_isis_csnp_clv_ip_authentication = -1;
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static gint ett_isis_csnp_clv_checksum = -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 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_clv_lsp_entries = -1;
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static gint ett_isis_psnp_lsp_entry = -1;
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static gint ett_isis_psnp_clv_authentication = -1;
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static gint ett_isis_psnp_clv_ip_authentication = -1;
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static gint ett_isis_psnp_clv_checksum = -1;
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static gint ett_isis_psnp_clv_unknown = -1;
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static void dissect_snp_authentication_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_snp_ip_authentication_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_snp_checksum_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static void dissect_snp_lsp_entries_clv(tvbuff_t *tvb,
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proto_tree *tree, int offset, int id_length, int length);
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static const isis_clv_handle_t clv_l1_csnp_opts[] = {
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{
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ISIS_CLV_LSP_ENTRIES,
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"LSP entries",
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&ett_isis_csnp_clv_lsp_entries,
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dissect_snp_lsp_entries_clv
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},
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{
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ISIS_CLV_AUTHENTICATION,
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"Authentication",
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&ett_isis_csnp_clv_authentication,
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dissect_snp_authentication_clv
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},
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{
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ISIS_CLV_IP_AUTHENTICATION,
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"IP Authentication",
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&ett_isis_csnp_clv_ip_authentication,
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dissect_snp_ip_authentication_clv
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},
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{
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ISIS_CLV_CHECKSUM,
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"Checksum",
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&ett_isis_csnp_clv_checksum,
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dissect_snp_checksum_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_LSP_ENTRIES,
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"LSP entries",
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&ett_isis_csnp_clv_lsp_entries,
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dissect_snp_lsp_entries_clv
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},
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{
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ISIS_CLV_AUTHENTICATION,
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"Authentication",
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&ett_isis_csnp_clv_authentication,
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dissect_snp_authentication_clv
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},
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{
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ISIS_CLV_IP_AUTHENTICATION,
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"IP Authentication",
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&ett_isis_csnp_clv_ip_authentication,
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dissect_snp_ip_authentication_clv
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},
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{
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ISIS_CLV_CHECKSUM,
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"Checksum",
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&ett_isis_csnp_clv_checksum,
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dissect_snp_checksum_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_LSP_ENTRIES,
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"LSP entries",
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&ett_isis_psnp_clv_lsp_entries,
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dissect_snp_lsp_entries_clv
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},
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{
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ISIS_CLV_AUTHENTICATION,
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"Authentication",
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&ett_isis_psnp_clv_authentication,
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dissect_snp_authentication_clv
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},
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{
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ISIS_CLV_IP_AUTHENTICATION,
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"IP Authentication",
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&ett_isis_psnp_clv_ip_authentication,
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dissect_snp_ip_authentication_clv
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},
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{
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ISIS_CLV_CHECKSUM,
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"Checksum",
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&ett_isis_psnp_clv_checksum,
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dissect_snp_checksum_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_LSP_ENTRIES,
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"LSP entries",
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&ett_isis_psnp_clv_lsp_entries,
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dissect_snp_lsp_entries_clv
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},
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{
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ISIS_CLV_AUTHENTICATION,
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"Authentication",
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&ett_isis_psnp_clv_authentication,
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dissect_snp_authentication_clv
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},
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{
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ISIS_CLV_IP_AUTHENTICATION,
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"IP Authentication",
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&ett_isis_psnp_clv_ip_authentication,
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dissect_snp_ip_authentication_clv
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},
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{
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ISIS_CLV_CHECKSUM,
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"Checksum",
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&ett_isis_psnp_clv_checksum,
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dissect_snp_checksum_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_lsp_entries_clv()
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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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* id_length : 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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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : protocol display tree to fill out. May be NULL
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* int : offset into packet data where we are.
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* int : length of IDs in packet.
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* int : length of payload to decode.
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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_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
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int id_length, int length)
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{
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proto_tree *subtree,*ti;
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while ( length > 0 ) {
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if ( length < 2+id_length+2+4+2 ) {
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isis_dissect_unknown(tvb, tree, offset,
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"Short SNP header entry (%d vs %d)", length,
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2+id_length+2+4+2 );
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return;
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}
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ti = proto_tree_add_text(tree, tvb, offset, 2+id_length+2+4+2,
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"LSP-ID: %s, Sequence: 0x%08x, Lifetime: %5us, Checksum: 0x%04x",
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print_system_id( tvb_get_ptr(tvb, offset+2, id_length+2), id_length+2 ),
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tvb_get_ntohl(tvb, offset+2+id_length+2),
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tvb_get_ntohs(tvb, offset),
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tvb_get_ntohs(tvb, offset+2+id_length+2+4));
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subtree = proto_item_add_subtree(ti,ett_isis_csnp_lsp_entry);
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proto_tree_add_text(subtree, tvb, offset+2, 8,
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"LSP-ID: : %s",
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print_system_id( tvb_get_ptr(tvb, offset+2, id_length+2), id_length+2 ));
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proto_tree_add_text(subtree, tvb, offset+2+id_length+2, 4,
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"LSP Sequence Number : 0x%08x",
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tvb_get_ntohl(tvb, offset+2+id_length+2));
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proto_tree_add_text(subtree, tvb, offset, 2,
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"Remaining Lifetime : %us",
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tvb_get_ntohs(tvb, offset));
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proto_tree_add_text(subtree, tvb, offset+2+id_length+2+4, 2,
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"LSP checksum : 0x%04x",
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tvb_get_ntohs(tvb, offset+2+id_length+2+4));
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length -= 2+id_length+2+4+2;
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offset += 2+id_length+2+4+2;
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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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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : protocol display tree to add to. May be NULL.
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* int offset : our offset into packet data.
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* int : type (l1 csnp, l2 csnp)
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* int : header length of packet.
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* int : length of IDs in packet.
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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(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset,
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int type, int header_length, int id_length)
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{
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proto_item *ti;
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proto_tree *csnp_tree = NULL;
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guint16 pdu_length;
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int len;
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if (tree) {
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ti = proto_tree_add_text(tree, tvb, offset, -1,
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PROTO_STRING_CSNP);
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csnp_tree = proto_item_add_subtree(ti, ett_isis_csnp);
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}
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pdu_length = tvb_get_ntohs(tvb, offset);
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if (tree) {
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proto_tree_add_uint(csnp_tree, hf_isis_csnp_pdu_length, tvb,
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offset, 2, pdu_length);
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}
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offset += 2;
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if (tree) {
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proto_tree_add_text(csnp_tree, tvb, offset, id_length + 1,
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"Source-ID: %s",
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print_system_id( tvb_get_ptr(tvb, offset, id_length+1), id_length+1 ) );
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}
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Source-ID: %s",
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print_system_id( tvb_get_ptr(tvb, offset, id_length+1), id_length+1 ) );
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}
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offset += id_length + 1;
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if (tree) {
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proto_tree_add_text(csnp_tree, tvb, offset, id_length + 2,
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"Start LSP-ID: %s",
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print_system_id( tvb_get_ptr(tvb, offset, id_length+2), id_length+2 ) );
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}
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Start LSP-ID: %s",
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print_system_id( tvb_get_ptr(tvb, offset, id_length+2), id_length+2 ) );
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}
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offset += id_length + 2;
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if (tree) {
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proto_tree_add_text(csnp_tree, tvb, offset, id_length + 2,
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"End LSP-ID: %s",
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print_system_id( tvb_get_ptr(tvb, offset, id_length+2), id_length+2 ) );
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}
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, ", End LSP-ID: %s",
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print_system_id( tvb_get_ptr(tvb, offset, id_length+2), id_length+2 ) );
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}
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offset += id_length + 2;
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len = pdu_length - 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(tvb, csnp_tree, offset,
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clv_l1_csnp_opts, len, id_length,
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ett_isis_csnp_clv_unknown );
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} else {
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isis_dissect_clvs(tvb, csnp_tree, offset,
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clv_l2_csnp_opts, len, id_length,
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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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* tvbuff_t * : tvbuffer for packet data
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* proto_tree * : protocol display tree to add to. May be NULL.
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* int : our offset into packet data
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* int : type (l1 psnp, l2 psnp)
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* int : header length of packet.
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* int : length of IDs in packet.
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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(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset,
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int type, int header_length, int id_length)
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{
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proto_item *ti;
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proto_tree *psnp_tree = NULL;
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guint16 pdu_length;
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int len;
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if (tree) {
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ti = proto_tree_add_text(tree, tvb, offset, -1,
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PROTO_STRING_PSNP);
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psnp_tree = proto_item_add_subtree(ti, ett_isis_psnp);
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}
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pdu_length = tvb_get_ntohs(tvb, offset);
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if (tree) {
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proto_tree_add_uint(psnp_tree, hf_isis_psnp_pdu_length, tvb,
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offset, 2, pdu_length);
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}
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offset += 2;
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if (tree) {
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proto_tree_add_text(psnp_tree, tvb, offset, id_length + 1,
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"Source-ID: %s",
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print_system_id( tvb_get_ptr(tvb, offset, id_length+1), id_length + 1 ) );
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}
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Source-ID: %s",
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print_system_id( tvb_get_ptr(tvb, offset, id_length+1), id_length+1 ) );
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}
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offset += id_length + 1;
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len = pdu_length - header_length;
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if (len < 0) {
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isis_dissect_unknown(tvb, tree, offset,
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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_PSNP ) {
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isis_dissect_clvs(tvb, psnp_tree, offset,
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clv_l1_psnp_opts, len, id_length,
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ett_isis_psnp_clv_unknown );
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} else {
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isis_dissect_clvs(tvb, psnp_tree, offset,
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clv_l2_psnp_opts, len, id_length,
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ett_isis_psnp_clv_unknown );
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}
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}
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/*
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* Name: dissect_snp_authentication_clv()
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*
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* Description:
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* Decode for a snp packets authenticaion clv.
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* Calls into the CLV common one.
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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 * : proto tree to build on (may be null)
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* int : current offset into packet data
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* int : length of IDs in packet.
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* int : length of this clv
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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_snp_authentication_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
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int id_length _U_, int length)
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{
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isis_dissect_authentication_clv(tvb, tree, offset, length);
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}
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/*
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* Name: dissect_snp_ip_authentication_clv()
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*
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* Description:
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* Decode for a snp packets authenticaion clv.
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* Calls into the CLV common one.
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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 * : proto tree to build on (may be null)
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* int : current offset into packet data
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* int : length of IDs in packet.
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* int : length of this clv
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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_snp_ip_authentication_clv(tvbuff_t *tvb, proto_tree *tree, int offset,
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int id_length _U_, int length)
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{
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isis_dissect_ip_authentication_clv(tvb, tree, offset, length);
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}
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/*
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* Name: dissect_snp_checksum_clv()
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*
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* Description:
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* dump and verify the optional checksum in TLV 12
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|
*
|
|
* Input:
|
|
* tvbuff_t * : tvbuffer for packet data
|
|
* proto_tree * : protocol display tree to fill out. May be NULL
|
|
* int : offset into packet data where we are.
|
|
* int : length of clv we are decoding
|
|
*
|
|
* Output:
|
|
* void, but we will add to proto tree if !NULL.
|
|
*/
|
|
|
|
static void
|
|
dissect_snp_checksum_clv(tvbuff_t *tvb,
|
|
proto_tree *tree, int offset, int id_length _U_, int length) {
|
|
|
|
guint16 pdu_length,checksum, cacl_checksum=0;
|
|
|
|
if (tree) {
|
|
if ( length != 2 ) {
|
|
proto_tree_add_text ( tree, tvb, offset, length,
|
|
"incorrect checksum length (%u), should be (2)", length );
|
|
return;
|
|
}
|
|
|
|
checksum = tvb_get_ntohs(tvb, offset);
|
|
|
|
/* the check_and_get_checksum() function needs to know how big
|
|
* the packet is. we can either pass through the pdu-len through several layers
|
|
* of dissectors and wrappers or extract the PDU length field from the PDU specific header
|
|
* which is offseted 8 bytes (relative to the beginning of the IS-IS packet) in SNPs */
|
|
|
|
pdu_length = tvb_get_ntohs(tvb, 8);
|
|
|
|
/* unlike the LSP checksum verification which starts at an offset of 12 we start at offset 0*/
|
|
switch (check_and_get_checksum(tvb, 0, pdu_length, checksum, offset, &cacl_checksum))
|
|
{
|
|
|
|
case NO_CKSUM :
|
|
proto_tree_add_text ( tree, tvb, offset, length,
|
|
"Checksum: 0x%04x (unused)", checksum);
|
|
break;
|
|
case DATA_MISSING :
|
|
isis_dissect_unknown(tvb, tree, offset,
|
|
"packet length %d went beyond packet",
|
|
tvb_length_remaining(tvb, 0));
|
|
break;
|
|
case CKSUM_NOT_OK :
|
|
proto_tree_add_text ( tree, tvb, offset, length,
|
|
"Checksum: 0x%04x (incorrect, should be 0x%04x)",
|
|
checksum,
|
|
cacl_checksum);
|
|
break;
|
|
case CKSUM_OK :
|
|
proto_tree_add_text ( tree, tvb, offset, length,
|
|
"Checksum: 0x%04x (correct)", checksum);
|
|
break;
|
|
default :
|
|
g_message("'check_and_get_checksum' returned an invalid value");
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Name: isis_register_csnp()
|
|
*
|
|
* Description:
|
|
* Register our protocol sub-sets with protocol manager.
|
|
*
|
|
* Input:
|
|
* int : protocol index for the ISIS protocol
|
|
*
|
|
* Output:
|
|
* void
|
|
*/
|
|
void
|
|
isis_register_csnp(int proto_isis) {
|
|
static hf_register_info hf[] = {
|
|
{ &hf_isis_csnp_pdu_length,
|
|
{ "PDU length", "isis.csnp.pdu_length", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, "", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_isis_csnp,
|
|
&ett_isis_csnp_clv_lsp_entries,
|
|
&ett_isis_csnp_lsp_entry,
|
|
&ett_isis_csnp_clv_authentication,
|
|
&ett_isis_csnp_clv_ip_authentication,
|
|
&ett_isis_csnp_clv_checksum,
|
|
&ett_isis_csnp_clv_unknown,
|
|
};
|
|
|
|
proto_register_field_array(proto_isis, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
|
|
/*
|
|
* Name: isis_register_psnp()
|
|
*
|
|
* Description:
|
|
* Register our protocol sub-sets with protocol manager.
|
|
*
|
|
* Input:
|
|
* int : protocol index for the ISIS protocol
|
|
*
|
|
* Output:
|
|
* void
|
|
*/
|
|
void
|
|
isis_register_psnp(int proto_isis) {
|
|
static hf_register_info hf[] = {
|
|
{ &hf_isis_psnp_pdu_length,
|
|
{ "PDU length", "isis.psnp.pdu_length", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, "", HFILL }},
|
|
};
|
|
static gint *ett[] = {
|
|
&ett_isis_psnp,
|
|
&ett_isis_psnp_clv_lsp_entries,
|
|
&ett_isis_psnp_lsp_entry,
|
|
&ett_isis_psnp_clv_authentication,
|
|
&ett_isis_psnp_clv_ip_authentication,
|
|
&ett_isis_psnp_clv_checksum,
|
|
&ett_isis_psnp_clv_unknown,
|
|
};
|
|
|
|
proto_register_field_array(proto_isis, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|