forked from osmocom/wireshark
528 lines
16 KiB
C
528 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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* Stuart Stanley <stuarts@mxmail.net>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/expert.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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void proto_register_isis_csnp(void);
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void proto_reg_handoff_isis_csnp(void);
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void proto_register_isis_psnp(void);
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void proto_reg_handoff_isis_psnp(void);
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void proto_register_isis_lsp(void);
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void proto_reg_handoff_isis_lsp(void);
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void proto_register_isis_hello(void);
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void proto_reg_handoff_isis_hello(void);
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static int proto_isis_csnp = -1;
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static int proto_isis_psnp = -1;
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/* csnp packets */
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static int hf_isis_csnp_pdu_length = -1;
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static int hf_isis_csnp_source_id = -1;
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static int hf_isis_csnp_start_lsp_id = -1;
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static int hf_isis_csnp_end_lsp_id = -1;
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static int hf_isis_csnp_lsp_id = -1;
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static int hf_isis_csnp_lsp_seq_num = -1;
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static int hf_isis_csnp_lsp_remain_life = -1;
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static int hf_isis_csnp_lsp_checksum = -1;
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static int hf_isis_csnp_checksum = -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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static expert_field ei_isis_csnp_short_packet = EI_INIT;
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static expert_field ei_isis_csnp_long_packet = EI_INIT;
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static expert_field ei_isis_csnp_authentication = EI_INIT;
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/* psnp packets */
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static int hf_isis_psnp_pdu_length = -1;
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static int hf_isis_psnp_source_id = -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 expert_field ei_isis_psnp_short_packet = EI_INIT;
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static expert_field ei_isis_psnp_long_packet = EI_INIT;
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static void
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dissect_snp_authentication_clv(tvbuff_t *tvb, packet_info* pinfo, 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(tree, pinfo, tvb, &ei_isis_csnp_authentication, offset, length);
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}
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static void
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dissect_snp_ip_authentication_clv(tvbuff_t *tvb, packet_info* pinfo _U_, 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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*/
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static void
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dissect_snp_checksum_clv(tvbuff_t *tvb, packet_info* pinfo,
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proto_tree *tree, int offset, int id_length _U_, int length) {
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guint16 pdu_length,checksum, cacl_checksum=0;
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proto_item* ti;
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if ( length != 2 ) {
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proto_tree_add_expert_format(tree, pinfo, &ei_isis_csnp_short_packet, tvb, offset, -1,
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"incorrect checksum length (%u), should be (2)", length );
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return;
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}
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ti = proto_tree_add_item( tree, hf_isis_csnp_checksum, tvb, offset, length, ENC_BIG_ENDIAN);
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checksum = tvb_get_ntohs(tvb, offset);
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/* the check_and_get_checksum() function needs to know how big
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* the packet is. we can either pass through the pdu-len through several layers
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* of dissectors and wrappers or extract the PDU length field from the PDU specific header
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* which is offseted 8 bytes (relative to the beginning of the IS-IS packet) in SNPs */
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pdu_length = tvb_get_ntohs(tvb, 8);
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/* unlike the LSP checksum verification which starts at an offset of 12 we start at offset 0*/
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switch (check_and_get_checksum(tvb, 0, pdu_length, checksum, offset, &cacl_checksum))
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{
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case NO_CKSUM :
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proto_item_append_text(ti, " [unused]");
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break;
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case DATA_MISSING :
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expert_add_info_format(pinfo, ti, &ei_isis_csnp_long_packet,
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"Packet length %d went beyond packet", tvb_length(tvb));
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break;
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case CKSUM_NOT_OK :
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proto_item_append_text(ti, " [incorrect, should be 0x%04x]", cacl_checksum);
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break;
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case CKSUM_OK :
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proto_item_append_text(ti, " [correct]");
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break;
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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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static void
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dissect_snp_lsp_entries_clv(tvbuff_t *tvb, packet_info* pinfo, 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;
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while ( length > 0 ) {
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if ( length < 2+id_length+2+4+2 ) {
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proto_tree_add_expert_format(tree, pinfo, &ei_isis_csnp_short_packet, tvb, offset, -1,
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"Short SNP header entry (%d vs %d)", length, 2+id_length+2+4+2 );
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return;
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}
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subtree = proto_tree_add_subtree(tree, tvb, offset, 2+id_length+2+4+2,
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ett_isis_csnp_lsp_entry, NULL, "LSP Entry");
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proto_tree_add_item(tree, hf_isis_csnp_lsp_id, tvb, offset+2, id_length+2, ENC_NA);
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proto_tree_add_item(subtree, hf_isis_csnp_lsp_seq_num, tvb, offset+2+id_length+2, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(subtree, hf_isis_csnp_lsp_remain_life, tvb, offset, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(subtree, hf_isis_csnp_lsp_checksum, tvb, offset+2+id_length+2+4, 2, ENC_BIG_ENDIAN);
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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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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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static void
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dissect_isis_csnp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset,
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const isis_clv_handle_t *opts, 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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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISIS CSNP");
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ti = proto_tree_add_item(tree, proto_isis_csnp, tvb, offset, -1, ENC_NA);
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csnp_tree = proto_item_add_subtree(ti, ett_isis_csnp);
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pdu_length = tvb_get_ntohs(tvb, offset);
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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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offset += 2;
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proto_tree_add_item(csnp_tree, hf_isis_csnp_source_id, tvb, offset, id_length, ENC_NA);
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Source-ID: %s", tvb_print_system_id( tvb, offset, id_length ));
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offset += id_length + 1;
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proto_tree_add_item(csnp_tree, hf_isis_csnp_start_lsp_id, tvb, offset, id_length + 2, ENC_NA);
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Start LSP-ID: %s",
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tvb_print_system_id( tvb, offset, id_length+2 ));
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offset += id_length + 2;
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proto_tree_add_item(csnp_tree, hf_isis_csnp_end_lsp_id, tvb, offset, id_length + 2, ENC_NA);
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col_append_fstr(pinfo->cinfo, COL_INFO, ", End LSP-ID: %s",
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tvb_print_system_id( tvb, offset, id_length+2 ));
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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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proto_tree_add_expert_format(tree, pinfo, &ei_isis_csnp_short_packet, tvb, offset, -1,
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"packet header length %d went beyond packet", header_length );
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return;
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}
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isis_dissect_clvs(tvb, pinfo, csnp_tree, offset,
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opts, &ei_isis_csnp_short_packet, len, id_length, ett_isis_csnp_clv_unknown );
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}
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static int
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dissect_isis_l1_csnp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
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{
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isis_data_t* isis = (isis_data_t*)data;
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dissect_isis_csnp(tvb, pinfo, tree, 0,
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clv_l1_csnp_opts, isis->header_length, isis->system_id_len);
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return tvb_length(tvb);
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}
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static int
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dissect_isis_l2_csnp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
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{
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isis_data_t* isis = (isis_data_t*)data;
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dissect_isis_csnp(tvb, pinfo, tree, 0,
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clv_l2_csnp_opts, isis->header_length, isis->system_id_len);
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return tvb_length(tvb);
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}
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static void
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dissect_isis_psnp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset,
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const isis_clv_handle_t *opts, 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;
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guint16 pdu_length;
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int len;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ISIS PSNP");
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ti = proto_tree_add_item(tree, proto_isis_psnp, tvb, offset, -1, ENC_NA);
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psnp_tree = proto_item_add_subtree(ti, ett_isis_psnp);
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pdu_length = tvb_get_ntohs(tvb, offset);
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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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offset += 2;
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proto_tree_add_item(psnp_tree, hf_isis_psnp_source_id, tvb, offset, id_length, ENC_NA);
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Source-ID: %s", tvb_print_system_id( tvb, offset, id_length ));
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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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proto_tree_add_expert_format(tree, pinfo, &ei_isis_psnp_long_packet, tvb, offset, -1,
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"packet header length %d went beyond packet", header_length );
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return;
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}
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/* Call into payload dissector */
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isis_dissect_clvs(tvb, pinfo, psnp_tree, offset,
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opts, &ei_isis_psnp_short_packet, len, id_length, ett_isis_psnp_clv_unknown );
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}
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static int
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dissect_isis_l1_psnp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
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{
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isis_data_t* isis = (isis_data_t*)data;
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dissect_isis_psnp(tvb, pinfo, tree, 0,
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clv_l1_psnp_opts, isis->header_length, isis->system_id_len);
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return tvb_length(tvb);
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}
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static int
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dissect_isis_l2_psnp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
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{
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isis_data_t* isis = (isis_data_t*)data;
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dissect_isis_psnp(tvb, pinfo, tree, 0,
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clv_l2_psnp_opts, isis->header_length, isis->system_id_len);
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return tvb_length(tvb);
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}
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void
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proto_register_isis_csnp(void)
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{
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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, NULL, HFILL }},
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{ &hf_isis_csnp_source_id,
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{ "Source-ID", "isis.csnp.source_id",
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FT_SYSTEM_ID, BASE_NONE, NULL, 0x0, NULL, HFILL }},
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{ &hf_isis_csnp_start_lsp_id,
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{ "Start LSP-ID", "isis.csnp.start_lsp_id",
|
|
FT_SYSTEM_ID, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_isis_csnp_end_lsp_id,
|
|
{ "End LSP-ID", "isis.csnp.end_lsp_id",
|
|
FT_SYSTEM_ID, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_isis_csnp_lsp_id,
|
|
{ "LSP-ID", "isis.csnp.lsp_id",
|
|
FT_SYSTEM_ID, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_isis_csnp_lsp_seq_num,
|
|
{ "LSP Sequence Number", "isis.csnp.lsp_seq_num", FT_UINT32,
|
|
BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_isis_csnp_lsp_remain_life,
|
|
{ "Remaining Lifetime", "isis.csnp.lsp_remain_life", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_isis_csnp_lsp_checksum,
|
|
{ "LSP checksum", "isis.csnp.lsp_checksum", FT_UINT16,
|
|
BASE_HEX, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_isis_csnp_checksum,
|
|
{ "Checksum", "isis.csnp.checksum", FT_UINT16,
|
|
BASE_HEX, NULL, 0x0, NULL, 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,
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_isis_csnp_short_packet, { "isis.csnp.short_packet", PI_MALFORMED, PI_ERROR, "Short packet", EXPFILL }},
|
|
{ &ei_isis_csnp_long_packet, { "isis.csnp.long_packet", PI_MALFORMED, PI_ERROR, "Long packet", EXPFILL }},
|
|
{ &ei_isis_csnp_authentication, { "isis.csnp.authentication.unknown", PI_PROTOCOL, PI_WARN, "Unknown authentication type", EXPFILL }},
|
|
};
|
|
expert_module_t* expert_isis_csnp;
|
|
|
|
/* Register the protocol name and description */
|
|
proto_isis_csnp = proto_register_protocol(PROTO_STRING_CSNP, "ISIS CSNP", "isis.csnp");
|
|
|
|
proto_register_field_array(proto_isis_csnp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_isis_csnp = expert_register_protocol(proto_isis_csnp);
|
|
expert_register_field_array(expert_isis_csnp, ei, array_length(ei));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_isis_csnp(void)
|
|
{
|
|
dissector_add_uint("isis.type", ISIS_TYPE_L1_CSNP, new_create_dissector_handle(dissect_isis_l1_csnp, proto_isis_csnp));
|
|
dissector_add_uint("isis.type", ISIS_TYPE_L2_CSNP, new_create_dissector_handle(dissect_isis_l2_csnp, proto_isis_csnp));
|
|
}
|
|
|
|
void
|
|
proto_register_isis_psnp(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_isis_psnp_pdu_length,
|
|
{ "PDU length", "isis.psnp.pdu_length", FT_UINT16,
|
|
BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_isis_psnp_source_id,
|
|
{ "Source-ID", "isis.psnp.source_id",
|
|
FT_BYTES, BASE_NONE, NULL, 0x0, NULL, 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,
|
|
};
|
|
static ei_register_info ei[] = {
|
|
{ &ei_isis_psnp_long_packet, { "isis.psnp.long_packet", PI_MALFORMED, PI_ERROR, "Long packet", EXPFILL }},
|
|
{ &ei_isis_psnp_short_packet, { "isis.psnp.short_packet", PI_MALFORMED, PI_ERROR, "Short packet", EXPFILL }},
|
|
};
|
|
expert_module_t* expert_isis_psnp;
|
|
|
|
/* Register the protocol name and description */
|
|
proto_isis_psnp = proto_register_protocol(PROTO_STRING_PSNP, "ISIS PSNP", "isis.psnp");
|
|
|
|
proto_register_field_array(proto_isis_psnp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_isis_psnp = expert_register_protocol(proto_isis_psnp);
|
|
expert_register_field_array(expert_isis_psnp, ei, array_length(ei));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_isis_psnp(void)
|
|
{
|
|
dissector_add_uint("isis.type", ISIS_TYPE_L1_PSNP, new_create_dissector_handle(dissect_isis_l1_psnp, proto_isis_psnp));
|
|
dissector_add_uint("isis.type", ISIS_TYPE_L2_PSNP, new_create_dissector_handle(dissect_isis_l2_psnp, proto_isis_psnp));
|
|
}
|