![Guy Harris](/assets/img/avatar_default.png)
from which to choose; use that for protocol fields in some protocols (modify the CORBA generator to use it, and manually update the generated CORBA dissectors accordingly). svn path=/trunk/; revision=32777
4145 lines
199 KiB
C
4145 lines
199 KiB
C
/* packet-sctp.c
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* Routines for Stream Control Transmission Protocol dissection
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*
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* It should be compliant to
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* - RFC 2960
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* - RFC 3309
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* - RFC 3758
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* - RFC 4460
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* - http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-addip-sctp-18.txt
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* - http://www.ietf.org/internet-drafts/draft-ietf-tsvwg-sctp-auth-08.txt
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* - http://www.ietf.org/internet-drafts/draft-stewart-sctp-pktdrprep-02.txt
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* - http://www.ietf.org/internet-drafts/draft-stewart-sctpstrrst-01.txt
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* - http://www.ietf.org/internet-drafts/draft-ladha-sctp-nonce-02.txt
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* - http://www.ietf.org/internet-drafts/draft-tuexen-tsvwg-sctp-sack-immediately-00.txt
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*
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* Copyright 2000-2005 Michael Tuexen <tuexen [AT] fh-muenster.de>
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* Still to do (so stay tuned)
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* - error checking mode
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* * padding errors
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* * length errors
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* * bundling errors
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* * value errors
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*
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*
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* Reassembly added 2006 by Robin Seggelmann
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* TSN Tracking by Luis E. G. Ontanon (Feb 2007)
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* Copyright 2009, Varun Notibala <nbvarun [AT] gmail.com>
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*
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* $Id$
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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., 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 <string.h>
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#include <epan/prefs.h>
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#include <epan/packet.h>
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#include <epan/tap.h>
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#include <epan/ipproto.h>
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#include <epan/addr_resolv.h>
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#include "packet-sctp.h"
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#include <epan/sctpppids.h>
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#include <epan/emem.h>
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#include <epan/expert.h>
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#include <packet-frame.h>
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#include <epan/crc32.h>
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#define LT(x, y) ((gint32)((x) - (y)) < 0)
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#define ADD_PADDING(x) ((((x) + 3) >> 2) << 2)
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#define UDP_TUNNELING_PORT 9899
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/* Initialize the protocol and registered fields */
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static int proto_sctp = -1;
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static int hf_port = -1;
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static int hf_source_port = -1;
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static int hf_destination_port = -1;
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static int hf_verification_tag = -1;
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static int hf_checksum = -1;
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static int hf_checksum_bad = -1;
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static int hf_chunk_type = -1;
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static int hf_chunk_flags = -1;
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static int hf_chunk_bit_1 = -1;
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static int hf_chunk_bit_2 = -1;
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static int hf_chunk_length = -1;
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static int hf_chunk_padding = -1;
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static int hf_chunk_value = -1;
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static int hf_initiate_tag = -1;
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static int hf_init_chunk_initiate_tag = -1;
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static int hf_init_chunk_adv_rec_window_credit = -1;
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static int hf_init_chunk_number_of_outbound_streams = -1;
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static int hf_init_chunk_number_of_inbound_streams = -1;
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static int hf_init_chunk_initial_tsn = -1;
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static int hf_initack_chunk_initiate_tag = -1;
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static int hf_initack_chunk_adv_rec_window_credit = -1;
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static int hf_initack_chunk_number_of_outbound_streams = -1;
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static int hf_initack_chunk_number_of_inbound_streams = -1;
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static int hf_initack_chunk_initial_tsn = -1;
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static int hf_cumulative_tsn_ack = -1;
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static int hf_data_chunk_tsn = -1;
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static int hf_data_chunk_stream_id = -1;
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static int hf_data_chunk_stream_seq_number = -1;
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static int hf_data_chunk_payload_proto_id = -1;
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static int hf_data_chunk_e_bit = -1;
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static int hf_data_chunk_b_bit = -1;
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static int hf_data_chunk_u_bit = -1;
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static int hf_data_chunk_i_bit = -1;
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static int hf_sack_chunk_ns = -1;
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static int hf_sack_chunk_cumulative_tsn_ack = -1;
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static int hf_sack_chunk_adv_rec_window_credit = -1;
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static int hf_sack_chunk_number_of_gap_blocks = -1;
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static int hf_sack_chunk_number_of_dup_tsns = -1;
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static int hf_sack_chunk_gap_block_start = -1;
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static int hf_sack_chunk_gap_block_end = -1;
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static int hf_sack_chunk_gap_block_start_tsn = -1;
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static int hf_sack_chunk_gap_block_end_tsn = -1;
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static int hf_sack_chunk_number_tsns_gap_acked = -1;
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static int hf_sack_chunk_duplicate_tsn = -1;
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static int hf_nr_sack_chunk_ns = -1;
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static int hf_nr_sack_chunk_cumulative_tsn_ack = -1;
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static int hf_nr_sack_chunk_adv_rec_window_credit = -1;
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static int hf_nr_sack_chunk_number_of_gap_blocks = -1;
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static int hf_nr_sack_chunk_number_of_nr_gap_blocks = -1;
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static int hf_nr_sack_chunk_number_of_dup_tsns = -1;
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static int hf_nr_sack_chunk_reserved = -1;
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static int hf_nr_sack_chunk_gap_block_start = -1;
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static int hf_nr_sack_chunk_gap_block_end = -1;
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static int hf_nr_sack_chunk_gap_block_start_tsn = -1;
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static int hf_nr_sack_chunk_gap_block_end_tsn = -1;
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static int hf_nr_sack_chunk_number_tsns_gap_acked = -1;
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static int hf_nr_sack_chunk_nr_gap_block_start = -1;
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static int hf_nr_sack_chunk_nr_gap_block_end = -1;
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static int hf_nr_sack_chunk_nr_gap_block_start_tsn = -1;
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static int hf_nr_sack_chunk_nr_gap_block_end_tsn = -1;
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static int hf_nr_sack_chunk_number_tsns_nr_gap_acked = -1;
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static int hf_nr_sack_chunk_duplicate_tsn = -1;
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static int hf_shutdown_chunk_cumulative_tsn_ack = -1;
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static int hf_cookie = -1;
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static int hf_cwr_chunk_lowest_tsn = -1;
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static int hf_ecne_chunk_lowest_tsn = -1;
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static int hf_abort_chunk_t_bit = -1;
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static int hf_shutdown_complete_chunk_t_bit = -1;
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static int hf_parameter_type = -1;
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static int hf_parameter_length = -1;
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static int hf_parameter_value = -1;
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static int hf_parameter_padding = -1;
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static int hf_parameter_bit_1 = -1;
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static int hf_parameter_bit_2 = -1;
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static int hf_ipv4_address = -1;
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static int hf_ipv6_address = -1;
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static int hf_heartbeat_info = -1;
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static int hf_state_cookie = -1;
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static int hf_cookie_preservative_increment = -1;
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static int hf_hostname = -1;
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static int hf_supported_address_type = -1;
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static int hf_stream_reset_req_seq_nr = -1;
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static int hf_stream_reset_rsp_seq_nr = -1;
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static int hf_senders_last_assigned_tsn = -1;
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static int hf_senders_next_tsn = -1;
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static int hf_receivers_next_tsn = -1;
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static int hf_stream_reset_rsp_result = -1;
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static int hf_stream_reset_sid = -1;
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static int hf_random_number = -1;
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static int hf_chunks_to_auth = -1;
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static int hf_hmac_id = -1;
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static int hf_hmac = -1;
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static int hf_shared_key_id = -1;
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static int hf_supported_chunk_type = -1;
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static int hf_cause_code = -1;
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static int hf_cause_length = -1;
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static int hf_cause_padding = -1;
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static int hf_cause_info = -1;
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static int hf_cause_stream_identifier = -1;
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static int hf_cause_reserved = -1;
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static int hf_cause_number_of_missing_parameters = -1;
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static int hf_cause_missing_parameter_type = -1;
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static int hf_cause_measure_of_staleness = -1;
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static int hf_cause_tsn = -1;
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static int hf_forward_tsn_chunk_tsn = -1;
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static int hf_forward_tsn_chunk_sid = -1;
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static int hf_forward_tsn_chunk_ssn = -1;
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static int hf_asconf_ack_serial = -1;
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static int hf_asconf_serial = -1;
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static int hf_correlation_id = -1;
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static int hf_adap_indication = -1;
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static int hf_pktdrop_chunk_m_bit = -1;
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static int hf_pktdrop_chunk_b_bit = -1;
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static int hf_pktdrop_chunk_t_bit = -1;
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static int hf_pktdrop_chunk_bandwidth = -1;
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static int hf_pktdrop_chunk_queuesize = -1;
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static int hf_pktdrop_chunk_truncated_length = -1;
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static int hf_pktdrop_chunk_reserved = -1;
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static int hf_pktdrop_chunk_data_field = -1;
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static int hf_sctp_reassembled_in = -1;
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static int hf_sctp_duplicate = -1;
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static int hf_sctp_fragments = -1;
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static int hf_sctp_fragment = -1;
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static int hf_sctp_retransmission = -1;
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static int hf_sctp_retransmitted = -1;
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static int hf_sctp_retransmitted_count = -1;
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static int hf_sctp_rtt = -1;
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static int hf_sctp_rto = -1;
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static int hf_sctp_ack_tsn = -1;
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static int hf_sctp_ack_frame = -1;
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static int hf_sctp_acked = -1;
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static int hf_sctp_retransmitted_after_ack = -1;
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static dissector_table_t sctp_port_dissector_table;
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static dissector_table_t sctp_ppi_dissector_table;
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static heur_dissector_list_t sctp_heur_subdissector_list;
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static int sctp_tap = -1;
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static module_t *sctp_module;
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/* Initialize the subtree pointers */
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static gint ett_sctp = -1;
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static gint ett_sctp_chunk = -1;
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static gint ett_sctp_chunk_parameter = -1;
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static gint ett_sctp_chunk_cause = -1;
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static gint ett_sctp_chunk_type = -1;
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static gint ett_sctp_data_chunk_flags = -1;
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static gint ett_sctp_sack_chunk_flags = -1;
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static gint ett_sctp_nr_sack_chunk_flags = -1;
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static gint ett_sctp_abort_chunk_flags = -1;
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static gint ett_sctp_shutdown_complete_chunk_flags = -1;
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static gint ett_sctp_pktdrop_chunk_flags = -1;
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static gint ett_sctp_parameter_type= -1;
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static gint ett_sctp_sack_chunk_gap_block = -1;
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static gint ett_sctp_sack_chunk_gap_block_start = -1;
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static gint ett_sctp_sack_chunk_gap_block_end = -1;
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static gint ett_sctp_nr_sack_chunk_gap_block = -1;
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static gint ett_sctp_nr_sack_chunk_gap_block_start = -1;
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static gint ett_sctp_nr_sack_chunk_gap_block_end = -1;
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static gint ett_sctp_nr_sack_chunk_nr_gap_block = -1;
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static gint ett_sctp_nr_sack_chunk_nr_gap_block_start = -1;
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static gint ett_sctp_nr_sack_chunk_nr_gap_block_end = -1;
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static gint ett_sctp_unrecognized_parameter_parameter = -1;
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static gint ett_sctp_fragments = -1;
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static gint ett_sctp_fragment = -1;
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static gint ett_sctp_tsn = -1;
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static gint ett_sctp_ack = -1;
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static gint ett_sctp_acked = -1;
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static gint ett_sctp_tsn_retransmission = -1;
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static gint ett_sctp_tsn_retransmitted_count = -1;
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static gint ett_sctp_tsn_retransmitted = -1;
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static dissector_handle_t data_handle;
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static gboolean enable_tsn_analysis = FALSE;
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static gboolean enable_ulp_dissection = TRUE;
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#define SCTP_DATA_CHUNK_ID 0
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#define SCTP_INIT_CHUNK_ID 1
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#define SCTP_INIT_ACK_CHUNK_ID 2
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#define SCTP_SACK_CHUNK_ID 3
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#define SCTP_HEARTBEAT_CHUNK_ID 4
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#define SCTP_HEARTBEAT_ACK_CHUNK_ID 5
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#define SCTP_ABORT_CHUNK_ID 6
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#define SCTP_SHUTDOWN_CHUNK_ID 7
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#define SCTP_SHUTDOWN_ACK_CHUNK_ID 8
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#define SCTP_ERROR_CHUNK_ID 9
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#define SCTP_COOKIE_ECHO_CHUNK_ID 10
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#define SCTP_COOKIE_ACK_CHUNK_ID 11
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#define SCTP_ECNE_CHUNK_ID 12
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#define SCTP_CWR_CHUNK_ID 13
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#define SCTP_SHUTDOWN_COMPLETE_CHUNK_ID 14
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#define SCTP_AUTH_CHUNK_ID 15
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#define SCTP_NR_SACK_CHUNK_ID 16
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#define SCTP_ASCONF_ACK_CHUNK_ID 0x80
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#define SCTP_PKTDROP_CHUNK_ID 0x81
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#define SCTP_STREAM_RESET_CHUNK_ID 0x82
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#define SCTP_FORWARD_TSN_CHUNK_ID 0xC0
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#define SCTP_ASCONF_CHUNK_ID 0xC1
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#define SCTP_IETF_EXT 0xFF
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static const value_string chunk_type_values[] = {
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{ SCTP_DATA_CHUNK_ID, "DATA" },
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{ SCTP_INIT_CHUNK_ID, "INIT" },
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{ SCTP_INIT_ACK_CHUNK_ID, "INIT_ACK" },
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{ SCTP_SACK_CHUNK_ID, "SACK" },
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{ SCTP_HEARTBEAT_CHUNK_ID, "HEARTBEAT" },
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{ SCTP_HEARTBEAT_ACK_CHUNK_ID, "HEARTBEAT_ACK" },
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{ SCTP_ABORT_CHUNK_ID, "ABORT" },
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{ SCTP_SHUTDOWN_CHUNK_ID, "SHUTDOWN" },
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{ SCTP_SHUTDOWN_ACK_CHUNK_ID, "SHUTDOWN_ACK" },
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{ SCTP_ERROR_CHUNK_ID, "ERROR" },
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{ SCTP_COOKIE_ECHO_CHUNK_ID, "COOKIE_ECHO" },
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{ SCTP_COOKIE_ACK_CHUNK_ID, "COOKIE_ACK" },
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{ SCTP_ECNE_CHUNK_ID, "ECNE" },
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{ SCTP_CWR_CHUNK_ID, "CWR" },
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{ SCTP_SHUTDOWN_COMPLETE_CHUNK_ID, "SHUTDOWN_COMPLETE" },
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{ SCTP_STREAM_RESET_CHUNK_ID, "STREAM_RESET" },
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{ SCTP_AUTH_CHUNK_ID, "AUTH" },
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{ SCTP_NR_SACK_CHUNK_ID, "NR-SACK" },
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{ SCTP_FORWARD_TSN_CHUNK_ID, "FORWARD_TSN" },
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{ SCTP_ASCONF_ACK_CHUNK_ID, "ASCONF_ACK" },
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{ SCTP_PKTDROP_CHUNK_ID, "PKTDROP" },
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{ SCTP_ASCONF_CHUNK_ID, "ASCONF" },
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{ SCTP_IETF_EXT, "IETF_EXTENSION" },
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{ 0, NULL } };
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/*
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* Based on http://www.iana.org/assignments/sctp-parameters
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* as of August 23rd, 2009
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*/
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static const value_string sctp_payload_proto_id_values[] = {
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{ NOT_SPECIFIED_PROTOCOL_ID, "not specified" },
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{ IUA_PAYLOAD_PROTOCOL_ID, "IUA" },
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{ M2UA_PAYLOAD_PROTOCOL_ID, "M2UA" },
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{ M3UA_PAYLOAD_PROTOCOL_ID, "M3UA" },
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{ SUA_PAYLOAD_PROTOCOL_ID, "SUA" },
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{ M2PA_PAYLOAD_PROTOCOL_ID, "M2PA" },
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{ V5UA_PAYLOAD_PROTOCOL_ID, "V5UA" },
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{ H248_PAYLOAD_PROTOCOL_ID, "H.248/MEGACO" },
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{ BICC_PAYLOAD_PROTOCOL_ID, "BICC/Q.2150.3" },
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{ TALI_PAYLOAD_PROTOCOL_ID, "TALI" },
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{ DUA_PAYLOAD_PROTOCOL_ID, "DUA" },
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{ ASAP_PAYLOAD_PROTOCOL_ID, "ASAP" },
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{ ENRP_PAYLOAD_PROTOCOL_ID, "ENRP" },
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{ H323_PAYLOAD_PROTOCOL_ID, "H.323" },
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{ QIPC_PAYLOAD_PROTOCOL_ID, "Q.IPC/Q.2150.3" },
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{ SIMCO_PAYLOAD_PROTOCOL_ID, "SIMCO" },
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{ DDP_SEG_CHUNK_PROTOCOL_ID, "DDP Segment Chunk" },
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{ DDP_STREAM_SES_CTRL_PROTOCOL_ID, "DDP Stream Session Control" },
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{ S1AP_PAYLOAD_PROTOCOL_ID, "S1 Application Protocol (S1AP)" },
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{ RUA_PAYLOAD_PROTOCOL_ID, "RUA" },
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{ HNBAP_PAYLOAD_PROTOCOL_ID, "HNBAP" },
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{ FORCES_HP_PAYLOAD_PROTOCOL_ID, "ForCES-HP" },
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{ FORCES_MP_PAYLOAD_PROTOCOL_ID, "ForCES-MP" },
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{ FORCES_LP_PAYLOAD_PROTOCOL_ID, "ForCES-LP" },
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{ SBC_AP_PAYLOAD_PROTOCOL_ID, "SBc-AP" },
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{ NBAP_PAYLOAD_PROTOCOL_ID, "NBAP" },
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/* Unassigned 26 */
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{ X2AP_PAYLOAD_PROTOCOL_ID, "X2AP" },
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{ IRCP_PAYLOAD_PROTOCOL_ID, "IRCP" },
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{ 0, NULL } };
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#define CHUNK_TYPE_LENGTH 1
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|
#define CHUNK_FLAGS_LENGTH 1
|
|
#define CHUNK_LENGTH_LENGTH 2
|
|
#define CHUNK_HEADER_LENGTH (CHUNK_TYPE_LENGTH + \
|
|
CHUNK_FLAGS_LENGTH + \
|
|
CHUNK_LENGTH_LENGTH)
|
|
#define CHUNK_HEADER_OFFSET 0
|
|
#define CHUNK_TYPE_OFFSET CHUNK_HEADER_OFFSET
|
|
#define CHUNK_FLAGS_OFFSET (CHUNK_TYPE_OFFSET + CHUNK_TYPE_LENGTH)
|
|
#define CHUNK_LENGTH_OFFSET (CHUNK_FLAGS_OFFSET + CHUNK_FLAGS_LENGTH)
|
|
#define CHUNK_VALUE_OFFSET (CHUNK_LENGTH_OFFSET + CHUNK_LENGTH_LENGTH)
|
|
|
|
#define PARAMETER_TYPE_LENGTH 2
|
|
#define PARAMETER_LENGTH_LENGTH 2
|
|
#define PARAMETER_HEADER_LENGTH (PARAMETER_TYPE_LENGTH + PARAMETER_LENGTH_LENGTH)
|
|
|
|
#define PARAMETER_HEADER_OFFSET 0
|
|
#define PARAMETER_TYPE_OFFSET PARAMETER_HEADER_OFFSET
|
|
#define PARAMETER_LENGTH_OFFSET (PARAMETER_TYPE_OFFSET + PARAMETER_TYPE_LENGTH)
|
|
#define PARAMETER_VALUE_OFFSET (PARAMETER_LENGTH_OFFSET + PARAMETER_LENGTH_LENGTH)
|
|
|
|
#define SOURCE_PORT_LENGTH 2
|
|
#define DESTINATION_PORT_LENGTH 2
|
|
#define VERIFICATION_TAG_LENGTH 4
|
|
#define CHECKSUM_LENGTH 4
|
|
#define COMMON_HEADER_LENGTH (SOURCE_PORT_LENGTH + \
|
|
DESTINATION_PORT_LENGTH + \
|
|
VERIFICATION_TAG_LENGTH + \
|
|
CHECKSUM_LENGTH)
|
|
#define SOURCE_PORT_OFFSET 0
|
|
#define DESTINATION_PORT_OFFSET (SOURCE_PORT_OFFSET + SOURCE_PORT_LENGTH)
|
|
#define VERIFICATION_TAG_OFFSET (DESTINATION_PORT_OFFSET + DESTINATION_PORT_LENGTH)
|
|
#define CHECKSUM_OFFSET (VERIFICATION_TAG_OFFSET + VERIFICATION_TAG_LENGTH)
|
|
|
|
#define SCTP_CHECKSUM_NONE 0
|
|
#define SCTP_CHECKSUM_ADLER32 1
|
|
#define SCTP_CHECKSUM_CRC32C 2
|
|
#define SCTP_CHECKSUM_AUTOMATIC 3
|
|
|
|
/* default values for preferences */
|
|
static gboolean show_port_numbers = TRUE;
|
|
/* FIXME
|
|
static gboolean show_chunk_types = TRUE;
|
|
*/
|
|
static gboolean show_always_control_chunks = TRUE;
|
|
static gint sctp_checksum = SCTP_CHECKSUM_NONE;
|
|
|
|
static gboolean use_reassembly = FALSE;
|
|
|
|
static struct _sctp_info sctp_info;
|
|
|
|
/* adler32.c -- compute the Adler-32 checksum of a data stream
|
|
* Copyright (C) 1995-1996 Mark Adler
|
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
|
* available, e.g. from http://www.cdrom.com/pub/infozip/zlib/
|
|
*
|
|
* It was modified for the use in this dissector.
|
|
*/
|
|
|
|
#define BASE 65521L /* largest prime smaller than 65536 */
|
|
#define NMAX 5540 /* NMAX is the largest n - 12 such that */
|
|
/* 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
|
|
|
|
#define DO1(buf,i) {s1 += buf[i]; s2 += s1;}
|
|
#define DO2(buf,i) DO1(buf,i); DO1(buf,i+1);
|
|
#define DO4(buf,i) DO2(buf,i); DO2(buf,i+2);
|
|
#define DO8(buf,i) DO4(buf,i); DO4(buf,i+4);
|
|
#define DO16(buf) DO8(buf,0); DO8(buf,8);
|
|
|
|
static unsigned int
|
|
sctp_adler32(const unsigned char* buf, unsigned int len)
|
|
{
|
|
unsigned int s1 = 1L;
|
|
unsigned int s2 = 0L;
|
|
int k;
|
|
|
|
/* handle the first 8 bytes of the datagram */
|
|
DO8(buf,0);
|
|
buf += SOURCE_PORT_LENGTH +
|
|
DESTINATION_PORT_LENGTH +
|
|
VERIFICATION_TAG_LENGTH;
|
|
|
|
/* handle four 0 bytes as checksum */
|
|
s2 += CHECKSUM_LENGTH * s1;
|
|
buf += CHECKSUM_LENGTH;
|
|
|
|
/* now we have 12 bytes handled */
|
|
len -= COMMON_HEADER_LENGTH;
|
|
|
|
/* handle the rest of the datagram */
|
|
while (len > 0) {
|
|
k = len < NMAX ? len : NMAX;
|
|
len -= k;
|
|
while (k >= 16) {
|
|
DO16(buf);
|
|
buf += 16;
|
|
k -= 16;
|
|
}
|
|
if (k != 0) do {
|
|
s1 += *buf++;
|
|
s2 += s1;
|
|
} while (--k);
|
|
s1 %= BASE;
|
|
s2 %= BASE;
|
|
}
|
|
return (s2 << 16) | s1;
|
|
}
|
|
|
|
|
|
static guint32
|
|
sctp_crc32c(const unsigned char* buf, unsigned int len)
|
|
{
|
|
unsigned int i;
|
|
guint32 crc32 = CRC32C_PRELOAD;
|
|
guint32 result;
|
|
unsigned char byte0,byte1,byte2,byte3;
|
|
|
|
for (i = 0; i < SOURCE_PORT_LENGTH + DESTINATION_PORT_LENGTH + VERIFICATION_TAG_LENGTH; i++)
|
|
{
|
|
CRC32C(crc32, buf[i]);
|
|
}
|
|
CRC32C(crc32, 0);
|
|
CRC32C(crc32, 0);
|
|
CRC32C(crc32, 0);
|
|
CRC32C(crc32, 0);
|
|
for (i = COMMON_HEADER_LENGTH; i < len; i++)
|
|
{
|
|
CRC32C(crc32, buf[i]);
|
|
}
|
|
result = ~crc32;
|
|
|
|
byte0 = result & 0xff;
|
|
byte1 = (result>>8) & 0xff;
|
|
byte2 = (result>>16) & 0xff;
|
|
byte3 = (result>>24) & 0xff;
|
|
crc32 = ((byte0 << 24) | (byte1 << 16) | (byte2 << 8) | byte3);
|
|
return ( crc32 );
|
|
}
|
|
|
|
/*
|
|
* Routines for dissecting parameters
|
|
*/
|
|
|
|
typedef struct _sctp_half_assoc_t sctp_half_assoc_t;
|
|
|
|
static void dissect_parameter(tvbuff_t *, packet_info *, proto_tree *, proto_item *, gboolean);
|
|
|
|
static void dissect_parameters(tvbuff_t *, packet_info *, proto_tree *, proto_item *, gboolean);
|
|
|
|
static void dissect_error_cause(tvbuff_t *, packet_info *, proto_tree *);
|
|
|
|
static void dissect_error_causes(tvbuff_t *, packet_info *, proto_tree *);
|
|
|
|
static gboolean dissect_data_chunk(tvbuff_t*, guint16, packet_info*, proto_tree*, proto_tree*, proto_item*, proto_item*, sctp_half_assoc_t*);
|
|
|
|
static void dissect_sctp_packet(tvbuff_t *, packet_info *, proto_tree *, gboolean);
|
|
|
|
|
|
/* TSN ANALYSIS CODE */
|
|
|
|
struct _sctp_half_assoc_t {
|
|
guint32 spt;
|
|
guint32 dpt;
|
|
guint32 vtag;
|
|
|
|
gboolean started;
|
|
|
|
guint32 first_tsn; /* start */
|
|
guint32 cumm_ack; /* rel */
|
|
emem_tree_t *tsns; /* sctp_tsn_t* by rel_tsn */
|
|
emem_tree_t *tsn_acks; /* sctp_tsn_t* by ctsn_frame */
|
|
|
|
struct _sctp_half_assoc_t *peer;
|
|
};
|
|
|
|
|
|
|
|
typedef struct _sctp_tsn_t {
|
|
guint32 tsn;
|
|
struct {
|
|
guint32 framenum;
|
|
nstime_t ts;
|
|
} first_transmit;
|
|
struct {
|
|
guint32 framenum;
|
|
nstime_t ts;
|
|
} ack;
|
|
struct _retransmit_t {
|
|
guint32 framenum;
|
|
nstime_t ts;
|
|
struct _retransmit_t *next;
|
|
} *retransmit;
|
|
guint32 retransmit_count;
|
|
struct _sctp_tsn_t *next;
|
|
} sctp_tsn_t;
|
|
|
|
|
|
static emem_tree_key_t*
|
|
make_address_key(guint32 spt, guint32 dpt, address *addr)
|
|
{
|
|
emem_tree_key_t *k = ep_alloc(sizeof(emem_tree_key_t)*6);
|
|
|
|
k[0].length = 1; k[0].key = ep_memdup(&spt,sizeof(spt));
|
|
k[1].length = 1; k[1].key = ep_memdup(&dpt,sizeof(dpt));
|
|
k[2].length = 1; k[2].key = (guint32*)(void *)&(addr->type);
|
|
k[3].length = 1; k[3].key = (guint32*)(void *)&(addr->len);
|
|
|
|
k[4].length = ((addr->len/4)+1);
|
|
k[4].key = ep_alloc0(((addr->len/4)+1)*4);
|
|
if (addr->len) memcpy(k[4].key, addr->data, addr->len);
|
|
|
|
k[5].length = 0; k[5].key = NULL;
|
|
|
|
return k;
|
|
}
|
|
|
|
static emem_tree_key_t *
|
|
make_dir_key(guint32 spt, guint32 dpt, guint32 vtag)
|
|
{
|
|
emem_tree_key_t *k = ep_alloc(sizeof(emem_tree_key_t)*4);
|
|
|
|
k[0].length = 1; k[0].key = ep_memdup(&spt,sizeof(spt));
|
|
k[1].length = 1; k[1].key = ep_memdup(&dpt,sizeof(dpt));
|
|
k[2].length = 1; k[2].key = ep_memdup(&vtag,sizeof(vtag));
|
|
k[3].length = 0; k[3].key = NULL;
|
|
|
|
return k;
|
|
}
|
|
|
|
|
|
|
|
static emem_tree_t *dirs_by_ptvtag; /* sctp_half_assoc_t* */
|
|
static emem_tree_t *dirs_by_ptaddr; /* sctp_half_assoc_t**, it may contain a null pointer */
|
|
|
|
static sctp_half_assoc_t *
|
|
get_half_assoc(packet_info *pinfo, guint32 spt, guint32 dpt, guint32 vtag)
|
|
{
|
|
sctp_half_assoc_t *ha;
|
|
sctp_half_assoc_t **hb;
|
|
emem_tree_key_t *k;
|
|
|
|
if (!enable_tsn_analysis || !vtag) return NULL;
|
|
|
|
/* look for the current half_assoc by spt, dpt and vtag */
|
|
|
|
k = make_dir_key(spt, dpt, vtag);
|
|
if (( ha = emem_tree_lookup32_array(dirs_by_ptvtag, k) )) {
|
|
/* found, if it has been already matched we're done */
|
|
if (ha->peer) return ha;
|
|
} else {
|
|
/* not found, make a new one and add it to the table */
|
|
ha = se_alloc0(sizeof(sctp_half_assoc_t));
|
|
ha->spt = spt;
|
|
ha->dpt = dpt;
|
|
ha->vtag = vtag;
|
|
ha->tsns = se_tree_create_non_persistent(EMEM_TREE_TYPE_RED_BLACK,"");
|
|
ha->tsn_acks = se_tree_create_non_persistent(EMEM_TREE_TYPE_RED_BLACK,"");
|
|
ha->started = FALSE;
|
|
ha->first_tsn= 0;
|
|
ha->cumm_ack= 0;
|
|
|
|
/* add this half to the table indexed by ports and vtag */
|
|
emem_tree_insert32_array(dirs_by_ptvtag, k, ha);
|
|
}
|
|
|
|
/* at this point we have an unmatched half, look for its other half using the ports and IP address */
|
|
k = make_address_key(dpt, spt, &(pinfo->dst));
|
|
|
|
if (( hb = emem_tree_lookup32_array(dirs_by_ptaddr, k) )) {
|
|
/*the table contains a pointer to a pointer to a half */
|
|
if (! *hb) {
|
|
/* if there is no half pointed by this, add the current half to the table */
|
|
*hb = ha;
|
|
} else {
|
|
/* there's a half pointed by this, assume it's our peer and clear the table's pointer */
|
|
ha->peer = *hb;
|
|
(*hb)->peer = ha;
|
|
*hb = NULL;
|
|
}
|
|
} else {
|
|
/* we found no entry in the table: add one (using reversed ports and src addresss) so that it can be matched later */
|
|
*(hb = se_alloc(sizeof(void*))) = ha;
|
|
k = make_address_key(spt, dpt, &(pinfo->src));
|
|
emem_tree_insert32_array(dirs_by_ptaddr, k, hb);
|
|
}
|
|
|
|
return ha;
|
|
}
|
|
|
|
/* Limit the number of retransmissions we track (to limit memory usage--and
|
|
* tree size--in pathological cases, for example zero window probing forever).
|
|
*/
|
|
#define MAX_RETRANS_TRACKED_PER_TSN 100
|
|
|
|
static void
|
|
tsn_tree(sctp_tsn_t *t, proto_item *tsn_item, packet_info *pinfo,
|
|
tvbuff_t *tvb, guint32 framenum)
|
|
{
|
|
proto_item *pi;
|
|
proto_tree *pt;
|
|
proto_tree *tsn_tree_pt = proto_item_add_subtree(tsn_item, ett_sctp_tsn);
|
|
|
|
if (t->first_transmit.framenum != framenum) {
|
|
nstime_t rto;
|
|
|
|
pi = proto_tree_add_uint(tsn_tree_pt, hf_sctp_retransmission, tvb, 0, 0, t->first_transmit.framenum);
|
|
pt = proto_item_add_subtree(pi, ett_sctp_tsn_retransmission);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
expert_add_info_format(pinfo, pi, PI_SEQUENCE, PI_NOTE, "Retransmitted TSN");
|
|
|
|
nstime_delta( &rto, &pinfo->fd->abs_ts, &(t->first_transmit.ts) );
|
|
pi = proto_tree_add_time(pt, hf_sctp_rto, tvb, 0, 0, &rto);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
/* Detect reneged acks */
|
|
/* XXX what if the frames aren't sorted by time? */
|
|
if (t->ack.framenum && t->ack.framenum < framenum)
|
|
{
|
|
pi = proto_tree_add_uint_format(pt, hf_sctp_retransmitted_after_ack, tvb, 0, 0, t->ack.framenum,
|
|
"This TSN was acked (in frame %u) prior to this retransmission (reneged ack?)",
|
|
t->ack.framenum);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
expert_add_info_format(pinfo, pi, PI_SEQUENCE, PI_WARN,
|
|
"This TSN was acked prior to this retransmission (reneged ack?)");
|
|
}
|
|
} else if (t->retransmit) {
|
|
struct _retransmit_t **r;
|
|
nstime_t rto;
|
|
char ds[64];
|
|
|
|
if (t->retransmit_count > MAX_RETRANS_TRACKED_PER_TSN)
|
|
g_snprintf(ds, sizeof(ds), " (only %d displayed)", MAX_RETRANS_TRACKED_PER_TSN);
|
|
else
|
|
ds[0] = 0;
|
|
|
|
pi = proto_tree_add_uint_format(tsn_tree_pt,
|
|
hf_sctp_retransmitted_count,
|
|
tvb, 0, 0, t->retransmit_count,
|
|
"This TSN was retransmitted %u time%s%s",
|
|
t->retransmit_count,
|
|
plurality(t->retransmit_count, "", "s"),
|
|
ds);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
if (t->retransmit_count > 2)
|
|
expert_add_info_format(pinfo, pi, PI_SEQUENCE, PI_WARN,
|
|
"This TSN was retransmitted more than 2 times");
|
|
|
|
pt = proto_item_add_subtree(pi, ett_sctp_tsn_retransmitted_count);
|
|
|
|
r = &t->retransmit;
|
|
while (*r) {
|
|
nstime_delta(&rto, &((*r)->ts), &pinfo->fd->abs_ts);
|
|
pi = proto_tree_add_uint_format(pt,
|
|
hf_sctp_retransmitted,
|
|
tvb, 0, 0,
|
|
(*r)->framenum,
|
|
"This TSN was retransmitted in frame %u (%s seconds after this frame)",
|
|
(*r)->framenum,
|
|
rel_time_to_secs_str(&rto));
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
r = &(*r)->next;
|
|
}
|
|
}
|
|
|
|
if (t->ack.framenum) {
|
|
nstime_t rtt;
|
|
|
|
pi = proto_tree_add_uint(tsn_tree_pt, hf_sctp_acked, tvb, 0 , 0, t->ack.framenum);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
pt = proto_item_add_subtree(pi, ett_sctp_ack);
|
|
|
|
nstime_delta( &rtt, &(t->ack.ts), &(t->first_transmit.ts) );
|
|
pi = proto_tree_add_time(pt, hf_sctp_rtt, tvb, 0, 0, &rtt);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
}
|
|
}
|
|
|
|
#define RELTSN(tsn) (((tsn) < h->first_tsn) ? (tsn + (0xffffffff - (h->first_tsn)) + 1) : (tsn - h->first_tsn))
|
|
|
|
static void
|
|
sctp_tsn(packet_info *pinfo, tvbuff_t *tvb, proto_item *tsn_item,
|
|
sctp_half_assoc_t *h, guint32 tsn)
|
|
{
|
|
sctp_tsn_t *t;
|
|
guint32 framenum;
|
|
guint32 reltsn;
|
|
|
|
/* no half assoc? nothing to do!*/
|
|
if (!h)
|
|
return;
|
|
|
|
|
|
framenum = pinfo->fd->num;
|
|
|
|
/* If we're dissecting for a read filter in the GUI [tshark assigns
|
|
* frame numbers before running the read filter], don't do the TSN
|
|
* analysis. (We can't anyway because we don't have a valid frame
|
|
* number...)
|
|
*
|
|
* Without this check if you load a capture file in the
|
|
* GUI while using a read filter, every SCTP TSN is marked as a
|
|
* retransmission of that in frame 0.
|
|
*/
|
|
if (framenum == 0)
|
|
return;
|
|
|
|
/* we have not seen any tsn yet in this half assoc set the ground */
|
|
if (! h->started) {
|
|
h->first_tsn = tsn;
|
|
h->started = TRUE;
|
|
}
|
|
|
|
|
|
reltsn = RELTSN(tsn);
|
|
|
|
/* printf("%.3d REL TSN: %p->%p [%u] %u \n",framenum,h,h->peer,tsn,reltsn); */
|
|
|
|
/* look for this tsn in this half's tsn table */
|
|
if (! (t = emem_tree_lookup32(h->tsns,reltsn) )) {
|
|
/* no tsn found, create a new one */
|
|
t = se_alloc0(sizeof(sctp_tsn_t));
|
|
t->tsn = tsn;
|
|
|
|
t->first_transmit.framenum = framenum;
|
|
t->first_transmit.ts.secs = pinfo->fd->abs_ts.secs;
|
|
t->first_transmit.ts.nsecs = pinfo->fd->abs_ts.nsecs;
|
|
|
|
emem_tree_insert32(h->tsns,reltsn,t);
|
|
}
|
|
|
|
if ( (! pinfo->fd->flags.visited ) && t->first_transmit.framenum != framenum ) {
|
|
struct _retransmit_t **r;
|
|
int i;
|
|
|
|
t->retransmit_count++;
|
|
r = &t->retransmit;
|
|
i = 0;
|
|
while (*r && i < MAX_RETRANS_TRACKED_PER_TSN) {
|
|
r = &(*r)->next;
|
|
i++;
|
|
}
|
|
|
|
if (i <= MAX_RETRANS_TRACKED_PER_TSN) {
|
|
/* TODO: we're allocating 16 bytes here. The se_
|
|
* allocator adds 8 bytes of canary to that at each
|
|
* allocation. Should these allocations be batched
|
|
* or does it not matter for the rare cases when there's
|
|
* more than 1 or 2 retransmissions of a TSN?
|
|
* For now, go with simplicity (of code here).
|
|
*/
|
|
*r = se_alloc0(sizeof(struct _retransmit_t));
|
|
(*r)->framenum = framenum;
|
|
(*r)->ts.secs = pinfo->fd->abs_ts.secs;
|
|
(*r)->ts.nsecs = pinfo->fd->abs_ts.nsecs;
|
|
}
|
|
}
|
|
|
|
tsn_tree(t, tsn_item, pinfo, tvb, framenum);
|
|
}
|
|
|
|
static void
|
|
ack_tree(sctp_tsn_t *t, proto_tree *acks_tree,
|
|
tvbuff_t *tvb, packet_info *pinfo)
|
|
{
|
|
proto_item *pi;
|
|
proto_tree *pt;
|
|
nstime_t rtt;
|
|
guint framenum = pinfo->fd->num;
|
|
|
|
if ( t->ack.framenum == framenum ) {
|
|
nstime_delta( &rtt, &(t->ack.ts), &(t->first_transmit.ts) );
|
|
|
|
pi = proto_tree_add_uint(acks_tree, hf_sctp_ack_tsn, tvb, 0 , 0, t->tsn);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
pt = proto_item_add_subtree(pi, ett_sctp_acked);
|
|
|
|
pi = proto_tree_add_uint(pt, hf_sctp_ack_frame, tvb, 0 , 0, t->first_transmit.framenum);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
pi = proto_tree_add_time(pt, hf_sctp_rtt, tvb, 0, 0, &rtt);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
}
|
|
}
|
|
|
|
static void
|
|
sctp_ack(packet_info *pinfo, tvbuff_t *tvb, proto_tree *acks_tree,
|
|
sctp_half_assoc_t *h, guint32 reltsn)
|
|
{
|
|
sctp_tsn_t *t;
|
|
guint32 framenum;
|
|
|
|
|
|
if (!h || !h->peer)
|
|
return;
|
|
|
|
framenum = pinfo->fd->num;
|
|
|
|
/* printf("%.6d ACK: %p->%p [%u] \n",framenum,h,h->peer,reltsn); */
|
|
|
|
t = se_tree_lookup32(h->peer->tsns,reltsn);
|
|
|
|
if (t) {
|
|
if (! t->ack.framenum) {
|
|
sctp_tsn_t *t2;
|
|
|
|
t->ack.framenum = framenum;
|
|
t->ack.ts.secs = pinfo->fd->abs_ts.secs;
|
|
t->ack.ts.nsecs = pinfo->fd->abs_ts.nsecs;
|
|
|
|
if (( t2 = emem_tree_lookup32(h->peer->tsn_acks, framenum) )) {
|
|
for(;t2->next;t2 = t2->next)
|
|
;
|
|
|
|
t2->next = t;
|
|
} else {
|
|
emem_tree_insert32(h->peer->tsn_acks, framenum,t);
|
|
}
|
|
}
|
|
|
|
if ( t->ack.framenum == framenum)
|
|
ack_tree(t, acks_tree, tvb, pinfo);
|
|
|
|
} /* else {
|
|
proto_tree_add_text(acks_tree, tvb, 0 , 0, "Assoc: %p vs %p ?? %ld",h,h->peer,tsn);
|
|
} */
|
|
}
|
|
|
|
#define RELTSNACK(tsn) (((tsn) < h->peer->first_tsn) ? ((tsn) + (0xffffffff - (h->peer->first_tsn)) + 1) : ((tsn) - h->peer->first_tsn))
|
|
static void
|
|
sctp_ack_block(packet_info *pinfo, sctp_half_assoc_t *h, tvbuff_t *tvb,
|
|
proto_item *acks_tree, const guint32 *tsn_start_ptr,
|
|
guint32 tsn_end)
|
|
{
|
|
sctp_tsn_t *t;
|
|
guint32 framenum;
|
|
guint32 rel_start;
|
|
guint32 rel_end;
|
|
|
|
|
|
if ( !h || !h->peer || ! h->peer->started )
|
|
return;
|
|
|
|
framenum = pinfo->fd->num;
|
|
rel_end = RELTSNACK(tsn_end);
|
|
|
|
if (tsn_start_ptr) {
|
|
rel_start = RELTSNACK(*tsn_start_ptr);
|
|
/* printf("%.3d BACK: %p->%p [%u-%u]\n",framenum,h,h->peer,rel_start,rel_end); */
|
|
} else {
|
|
rel_start = h->peer->cumm_ack;
|
|
/* printf("%.3d CACK: %p->%p [%u-%u]\n",framenum,h,h->peer,rel_start,rel_end); */
|
|
}
|
|
|
|
|
|
if ((t = emem_tree_lookup32(h->peer->tsn_acks, framenum))) {
|
|
for(;t;t = t->next) {
|
|
guint32 tsn = t->tsn;
|
|
|
|
if ( tsn < h->peer->first_tsn ) {
|
|
tsn += (0xffffffff - (h->peer->first_tsn)) + 1;
|
|
} else {
|
|
tsn -= h->peer->first_tsn;
|
|
}
|
|
|
|
if (t->ack.framenum == framenum && ( (!tsn_start_ptr) || rel_start <= tsn) && tsn <= rel_end)
|
|
ack_tree(t, acks_tree, tvb, pinfo);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
if (pinfo->fd->flags.visited || rel_end < rel_start || rel_end - rel_start > 0xffff0000 ) return;
|
|
|
|
if (! tsn_start_ptr )
|
|
h->peer->cumm_ack = rel_end + 1;
|
|
|
|
if (rel_start <= rel_end && rel_end - rel_start < 5000 ) {
|
|
guint32 rel_tsn, i;
|
|
for (i=0; i <= rel_end-rel_start; i++) {
|
|
rel_tsn = (guint32) (i+rel_start);
|
|
sctp_ack(pinfo, tvb, acks_tree, h, rel_tsn);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* END TSN ANALYSIS CODE */
|
|
|
|
|
|
|
|
|
|
#define HEARTBEAT_INFO_PARAMETER_INFO_OFFSET PARAMETER_VALUE_OFFSET
|
|
|
|
static void
|
|
dissect_heartbeat_info_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
|
|
{
|
|
guint16 heartbeat_info_length;
|
|
|
|
heartbeat_info_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
|
|
if (heartbeat_info_length > 0)
|
|
proto_tree_add_item(parameter_tree, hf_heartbeat_info, parameter_tvb, HEARTBEAT_INFO_PARAMETER_INFO_OFFSET, heartbeat_info_length, REP_BIG_ENDIAN);
|
|
proto_item_append_text(parameter_item, " (Information: %u byte%s)", heartbeat_info_length, plurality(heartbeat_info_length, "", "s"));
|
|
}
|
|
|
|
#define IPV4_ADDRESS_LENGTH 4
|
|
#define IPV4_ADDRESS_OFFSET PARAMETER_VALUE_OFFSET
|
|
|
|
static void
|
|
dissect_ipv4_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item, proto_item *additional_item, gboolean dissecting_init_init_ack_chunk)
|
|
{
|
|
if (parameter_tree) {
|
|
proto_tree_add_item(parameter_tree, hf_ipv4_address, parameter_tvb, IPV4_ADDRESS_OFFSET, IPV4_ADDRESS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(parameter_item, " (Address: %s)", ip_to_str((const guint8 *)tvb_get_ptr(parameter_tvb, IPV4_ADDRESS_OFFSET, IPV4_ADDRESS_LENGTH)));
|
|
if (additional_item)
|
|
proto_item_append_text(additional_item, "%s", ip_to_str((const guint8 *)tvb_get_ptr(parameter_tvb, IPV4_ADDRESS_OFFSET, IPV4_ADDRESS_LENGTH)));
|
|
}
|
|
if (dissecting_init_init_ack_chunk) {
|
|
if (sctp_info.number_of_tvbs < MAXIMUM_NUMBER_OF_TVBS)
|
|
sctp_info.tvb[sctp_info.number_of_tvbs++] = parameter_tvb;
|
|
else
|
|
sctp_info.incomplete = TRUE;
|
|
}
|
|
}
|
|
|
|
#define IPV6_ADDRESS_LENGTH 16
|
|
#define IPV6_ADDRESS_OFFSET PARAMETER_VALUE_OFFSET
|
|
|
|
static void
|
|
dissect_ipv6_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item, proto_item *additional_item, gboolean dissecting_init_init_ack_chunk)
|
|
{
|
|
if (parameter_tree) {
|
|
proto_tree_add_item(parameter_tree, hf_ipv6_address, parameter_tvb, IPV6_ADDRESS_OFFSET, IPV6_ADDRESS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(parameter_item, " (Address: %s)", ip6_to_str((const struct e_in6_addr *)tvb_get_ptr(parameter_tvb, IPV6_ADDRESS_OFFSET, IPV6_ADDRESS_LENGTH)));
|
|
if (additional_item)
|
|
proto_item_append_text(additional_item, "%s", ip6_to_str((const struct e_in6_addr *)tvb_get_ptr(parameter_tvb, IPV6_ADDRESS_OFFSET, IPV6_ADDRESS_LENGTH)));
|
|
}
|
|
if (dissecting_init_init_ack_chunk) {
|
|
if (sctp_info.number_of_tvbs < MAXIMUM_NUMBER_OF_TVBS)
|
|
sctp_info.tvb[sctp_info.number_of_tvbs++] = parameter_tvb;
|
|
else
|
|
sctp_info.incomplete = TRUE;
|
|
}
|
|
}
|
|
|
|
#define STATE_COOKIE_PARAMETER_COOKIE_OFFSET PARAMETER_VALUE_OFFSET
|
|
|
|
static void
|
|
dissect_state_cookie_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
|
|
{
|
|
guint16 state_cookie_length;
|
|
|
|
state_cookie_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
|
|
if (state_cookie_length > 0)
|
|
proto_tree_add_item(parameter_tree, hf_state_cookie, parameter_tvb, STATE_COOKIE_PARAMETER_COOKIE_OFFSET, state_cookie_length, REP_BIG_ENDIAN);
|
|
proto_item_append_text(parameter_item, " (Cookie length: %u byte%s)", state_cookie_length, plurality(state_cookie_length, "", "s"));
|
|
}
|
|
|
|
static void
|
|
dissect_unrecognized_parameters_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *parameter_tree)
|
|
{
|
|
/* FIXME: Does it contain one or more parameters? */
|
|
dissect_parameter(tvb_new_subset_remaining(parameter_tvb, PARAMETER_VALUE_OFFSET), pinfo, parameter_tree, NULL, FALSE);
|
|
}
|
|
|
|
#define COOKIE_PRESERVATIVE_PARAMETER_INCR_LENGTH 4
|
|
#define COOKIE_PRESERVATIVE_PARAMETER_INCR_OFFSET PARAMETER_VALUE_OFFSET
|
|
|
|
static void
|
|
dissect_cookie_preservative_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
|
|
{
|
|
proto_tree_add_item(parameter_tree, hf_cookie_preservative_increment, parameter_tvb, COOKIE_PRESERVATIVE_PARAMETER_INCR_OFFSET, COOKIE_PRESERVATIVE_PARAMETER_INCR_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(parameter_item, " (Increment :%u msec)", tvb_get_ntohl(parameter_tvb, COOKIE_PRESERVATIVE_PARAMETER_INCR_OFFSET));
|
|
}
|
|
|
|
#define HOSTNAME_OFFSET PARAMETER_VALUE_OFFSET
|
|
|
|
static void
|
|
dissect_hostname_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
|
|
{
|
|
guint16 hostname_length;
|
|
|
|
hostname_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
|
|
proto_tree_add_item(parameter_tree, hf_hostname, parameter_tvb, HOSTNAME_OFFSET, hostname_length, REP_BIG_ENDIAN);
|
|
proto_item_append_text(parameter_item, " (Hostname: %.*s)", hostname_length, (const char *)tvb_get_ptr(parameter_tvb, HOSTNAME_OFFSET, hostname_length));
|
|
|
|
}
|
|
|
|
#define IPv4_ADDRESS_TYPE 5
|
|
#define IPv6_ADDRESS_TYPE 6
|
|
#define HOSTNAME_ADDRESS_TYPE 11
|
|
|
|
static const value_string address_types_values[] = {
|
|
{ IPv4_ADDRESS_TYPE, "IPv4 address" },
|
|
{ IPv6_ADDRESS_TYPE, "IPv6 address" },
|
|
{ HOSTNAME_ADDRESS_TYPE, "Hostname address" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define SUPPORTED_ADDRESS_TYPE_PARAMETER_ADDRESS_TYPE_LENGTH 2
|
|
|
|
static void
|
|
dissect_supported_address_types_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
|
|
{
|
|
guint16 addr_type, number_of_addr_types, addr_type_number;
|
|
guint offset;
|
|
|
|
number_of_addr_types = (tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH)
|
|
/ SUPPORTED_ADDRESS_TYPE_PARAMETER_ADDRESS_TYPE_LENGTH;
|
|
|
|
offset = PARAMETER_VALUE_OFFSET;
|
|
proto_item_append_text(parameter_item, " (Supported types: ");
|
|
for(addr_type_number = 1; addr_type_number <= number_of_addr_types; addr_type_number++) {
|
|
proto_tree_add_item(parameter_tree, hf_supported_address_type, parameter_tvb, offset, SUPPORTED_ADDRESS_TYPE_PARAMETER_ADDRESS_TYPE_LENGTH, REP_BIG_ENDIAN);
|
|
addr_type = tvb_get_ntohs(parameter_tvb, offset);
|
|
switch (addr_type) {
|
|
case IPv4_ADDRESS_TYPE:
|
|
proto_item_append_text(parameter_item, "IPv4");
|
|
break;
|
|
case IPv6_ADDRESS_TYPE:
|
|
proto_item_append_text(parameter_item, "IPv6");
|
|
break;
|
|
case HOSTNAME_ADDRESS_TYPE:
|
|
proto_item_append_text(parameter_item, "hostname");
|
|
break;
|
|
default:
|
|
proto_item_append_text(parameter_item, "%u", addr_type);
|
|
}
|
|
if (addr_type_number < number_of_addr_types)
|
|
proto_item_append_text(parameter_item, ", ");
|
|
offset += SUPPORTED_ADDRESS_TYPE_PARAMETER_ADDRESS_TYPE_LENGTH;
|
|
}
|
|
proto_item_append_text(parameter_item, ")");
|
|
}
|
|
|
|
#define STREAM_RESET_SEQ_NR_LENGTH 4
|
|
#define SENDERS_LAST_ASSIGNED_TSN_LENGTH 4
|
|
#define SID_LENGTH 2
|
|
|
|
#define STREAM_RESET_REQ_SEQ_NR_OFFSET PARAMETER_VALUE_OFFSET
|
|
#define STREAM_RESET_REQ_RSP_SEQ_NR_OFFSET (PARAMETER_VALUE_OFFSET + STREAM_RESET_SEQ_NR_LENGTH)
|
|
#define SENDERS_LAST_ASSIGNED_TSN_OFFSET (STREAM_RESET_REQ_RSP_SEQ_NR_OFFSET + STREAM_RESET_SEQ_NR_LENGTH)
|
|
|
|
static void
|
|
dissect_outgoing_ssn_reset_request_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item _U_)
|
|
{
|
|
guint length, number_of_sids, sid_number, sid_offset;
|
|
|
|
proto_tree_add_item(parameter_tree, hf_stream_reset_req_seq_nr, parameter_tvb, STREAM_RESET_REQ_SEQ_NR_OFFSET, STREAM_RESET_SEQ_NR_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(parameter_tree, hf_stream_reset_rsp_seq_nr, parameter_tvb, STREAM_RESET_REQ_RSP_SEQ_NR_OFFSET, STREAM_RESET_SEQ_NR_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(parameter_tree, hf_senders_last_assigned_tsn, parameter_tvb, SENDERS_LAST_ASSIGNED_TSN_OFFSET, SENDERS_LAST_ASSIGNED_TSN_LENGTH, REP_BIG_ENDIAN);
|
|
|
|
length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
|
|
sid_offset = SENDERS_LAST_ASSIGNED_TSN_OFFSET + SENDERS_LAST_ASSIGNED_TSN_LENGTH;
|
|
if (length > PARAMETER_HEADER_LENGTH + STREAM_RESET_SEQ_NR_LENGTH + STREAM_RESET_SEQ_NR_LENGTH + SENDERS_LAST_ASSIGNED_TSN_LENGTH) {
|
|
number_of_sids = (length - (PARAMETER_HEADER_LENGTH + STREAM_RESET_SEQ_NR_LENGTH + STREAM_RESET_SEQ_NR_LENGTH + SENDERS_LAST_ASSIGNED_TSN_LENGTH)) / SID_LENGTH;
|
|
for(sid_number = 1; sid_number <= number_of_sids; sid_number++) {
|
|
proto_tree_add_item(parameter_tree, hf_stream_reset_sid, parameter_tvb, sid_offset, SID_LENGTH, REP_BIG_ENDIAN);
|
|
sid_offset += SID_LENGTH;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_incoming_ssn_reset_request_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item _U_)
|
|
{
|
|
guint length, number_of_sids, sid_number, sid_offset;
|
|
|
|
proto_tree_add_item(parameter_tree, hf_stream_reset_req_seq_nr, parameter_tvb, STREAM_RESET_REQ_SEQ_NR_OFFSET, STREAM_RESET_SEQ_NR_LENGTH, REP_BIG_ENDIAN);
|
|
|
|
length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
|
|
sid_offset = STREAM_RESET_REQ_SEQ_NR_OFFSET + STREAM_RESET_SEQ_NR_LENGTH;
|
|
if (length > PARAMETER_HEADER_LENGTH + STREAM_RESET_SEQ_NR_LENGTH) {
|
|
number_of_sids = (length - (PARAMETER_HEADER_LENGTH + STREAM_RESET_SEQ_NR_LENGTH)) / SID_LENGTH;
|
|
for(sid_number = 1; sid_number <= number_of_sids; sid_number++) {
|
|
proto_tree_add_item(parameter_tree, hf_stream_reset_sid, parameter_tvb, sid_offset, SID_LENGTH, REP_BIG_ENDIAN);
|
|
sid_offset += SID_LENGTH;
|
|
}
|
|
}
|
|
}
|
|
|
|
#define STREAM_RESET_REQ_SEQ_NR_OFFSET PARAMETER_VALUE_OFFSET
|
|
|
|
static void
|
|
dissect_ssn_tsn_reset_request_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item _U_)
|
|
{
|
|
proto_tree_add_item(parameter_tree, hf_stream_reset_req_seq_nr, parameter_tvb, STREAM_RESET_REQ_SEQ_NR_OFFSET, STREAM_RESET_SEQ_NR_LENGTH, REP_BIG_ENDIAN);
|
|
}
|
|
|
|
#define STREAM_RESET_RSP_RESULT_LENGTH 4
|
|
#define SENDERS_NEXT_TSN_LENGTH 4
|
|
#define RECEIVERS_NEXT_TSN_LENGTH 4
|
|
|
|
#define STREAM_RESET_RSP_RSP_SEQ_NR_OFFSET PARAMETER_VALUE_OFFSET
|
|
#define STREAM_RESET_RSP_RESULT_OFFSET (STREAM_RESET_RSP_RSP_SEQ_NR_OFFSET + STREAM_RESET_SEQ_NR_LENGTH)
|
|
#define SENDERS_NEXT_TSN_OFFSET (STREAM_RESET_RSP_RESULT_OFFSET + STREAM_RESET_RSP_RESULT_LENGTH)
|
|
#define RECEIVERS_NEXT_TSN_OFFSET (SENDERS_NEXT_TSN_OFFSET + SENDERS_NEXT_TSN_LENGTH)
|
|
|
|
static const value_string stream_reset_result_values[] = {
|
|
{ 0, "Nothing to do" },
|
|
{ 1, "Performed" },
|
|
{ 2, "Denied" },
|
|
{ 3, "Error - Wrong SSN" },
|
|
{ 4, "Error - Request already in progress" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
|
|
static void
|
|
dissect_stream_reset_response_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item _U_)
|
|
{
|
|
guint length;
|
|
|
|
length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
|
|
|
|
proto_tree_add_item(parameter_tree, hf_stream_reset_rsp_seq_nr, parameter_tvb, STREAM_RESET_RSP_RSP_SEQ_NR_OFFSET, STREAM_RESET_SEQ_NR_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(parameter_tree, hf_stream_reset_rsp_result, parameter_tvb, STREAM_RESET_RSP_RESULT_OFFSET, STREAM_RESET_RSP_RESULT_LENGTH, REP_BIG_ENDIAN);
|
|
if (length >= PARAMETER_HEADER_LENGTH + STREAM_RESET_SEQ_NR_LENGTH + STREAM_RESET_RSP_RESULT_LENGTH + SENDERS_NEXT_TSN_LENGTH)
|
|
proto_tree_add_item(parameter_tree, hf_senders_next_tsn, parameter_tvb, SENDERS_NEXT_TSN_OFFSET, SENDERS_NEXT_TSN_LENGTH, REP_BIG_ENDIAN);
|
|
if (length >= PARAMETER_HEADER_LENGTH + STREAM_RESET_SEQ_NR_LENGTH + STREAM_RESET_RSP_RESULT_LENGTH + SENDERS_NEXT_TSN_LENGTH + RECEIVERS_NEXT_TSN_LENGTH)
|
|
proto_tree_add_item(parameter_tree, hf_receivers_next_tsn, parameter_tvb, RECEIVERS_NEXT_TSN_OFFSET, RECEIVERS_NEXT_TSN_LENGTH, REP_BIG_ENDIAN);
|
|
}
|
|
|
|
static void
|
|
dissect_ecn_parameter(tvbuff_t *parameter_tvb _U_)
|
|
{
|
|
}
|
|
|
|
static void
|
|
dissect_nonce_supported_parameter(tvbuff_t *parameter_tvb _U_)
|
|
{
|
|
}
|
|
|
|
#define RANDOM_NUMBER_OFFSET PARAMETER_VALUE_OFFSET
|
|
|
|
static void
|
|
dissect_random_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
|
|
{
|
|
gint32 number_length;
|
|
|
|
number_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
|
|
if (number_length > 0)
|
|
proto_tree_add_item(parameter_tree, hf_random_number, parameter_tvb, RANDOM_NUMBER_OFFSET, number_length, REP_BIG_ENDIAN);
|
|
}
|
|
|
|
static void
|
|
dissect_chunks_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
|
|
{
|
|
gint32 number_of_chunks;
|
|
guint16 chunk_number, offset;
|
|
|
|
number_of_chunks = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
|
|
for(chunk_number = 1, offset = PARAMETER_VALUE_OFFSET; chunk_number <= number_of_chunks; chunk_number++, offset += CHUNK_TYPE_LENGTH)
|
|
proto_tree_add_item(parameter_tree, hf_chunks_to_auth, parameter_tvb, offset, CHUNK_TYPE_LENGTH, REP_BIG_ENDIAN);
|
|
}
|
|
|
|
static const value_string hmac_id_values[] = {
|
|
{ 0x0000, "Reserved" },
|
|
{ 0x0001, "SHA-1" },
|
|
{ 0x0002, "Reserved" },
|
|
{ 0x0003, "SHA-256" },
|
|
{ 0x8001, "SHA_224" },
|
|
{ 0x8002, "SHA_384" },
|
|
{ 0x8003, "SHA_512" },
|
|
{ 0, NULL } };
|
|
|
|
#define HMAC_ID_LENGTH 2
|
|
|
|
static void
|
|
dissect_hmac_algo_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree)
|
|
{
|
|
gint32 number_of_ids;
|
|
guint16 id_number, offset;
|
|
|
|
number_of_ids = (tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH) / HMAC_ID_LENGTH;
|
|
for(id_number = 1, offset = PARAMETER_VALUE_OFFSET; id_number <= number_of_ids; id_number++, offset += HMAC_ID_LENGTH)
|
|
proto_tree_add_item(parameter_tree, hf_hmac_id, parameter_tvb, offset, HMAC_ID_LENGTH, REP_BIG_ENDIAN);
|
|
}
|
|
|
|
static void
|
|
dissect_supported_extensions_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
|
|
{
|
|
gint32 number_of_types;
|
|
guint16 type_number, offset;
|
|
|
|
proto_item_append_text(parameter_item, " (Supported types: ");
|
|
number_of_types = (tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH) / CHUNK_TYPE_LENGTH;
|
|
for(type_number = 1, offset = PARAMETER_VALUE_OFFSET; type_number <= number_of_types; type_number++, offset += CHUNK_TYPE_LENGTH) {
|
|
proto_tree_add_item(parameter_tree, hf_supported_chunk_type, parameter_tvb, offset, CHUNK_TYPE_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(parameter_item, "%s", val_to_str(tvb_get_guint8(parameter_tvb, offset), chunk_type_values, "Unknown"));
|
|
if (type_number < number_of_types)
|
|
proto_item_append_text(parameter_item, ", ");
|
|
|
|
}
|
|
proto_item_append_text(parameter_item, ")");
|
|
}
|
|
|
|
static void
|
|
dissect_forward_tsn_supported_parameter(tvbuff_t *parameter_tvb _U_)
|
|
{
|
|
}
|
|
|
|
#define CORRELATION_ID_LENGTH 4
|
|
#define CORRELATION_ID_OFFSET PARAMETER_VALUE_OFFSET
|
|
#define ADDRESS_PARAMETER_OFFSET (CORRELATION_ID_OFFSET + CORRELATION_ID_LENGTH)
|
|
|
|
static void
|
|
dissect_add_ip_address_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *parameter_tree, proto_item *parameter_item)
|
|
{
|
|
guint16 address_length;
|
|
tvbuff_t *address_tvb;
|
|
|
|
address_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH - CORRELATION_ID_LENGTH;
|
|
|
|
proto_tree_add_item(parameter_tree, hf_correlation_id, parameter_tvb, CORRELATION_ID_OFFSET, CORRELATION_ID_LENGTH, REP_BIG_ENDIAN);
|
|
address_tvb = tvb_new_subset(parameter_tvb, ADDRESS_PARAMETER_OFFSET, address_length, address_length);
|
|
proto_item_append_text(parameter_item, " (Address: ");
|
|
dissect_parameter(address_tvb, pinfo, parameter_tree, parameter_item, FALSE);
|
|
proto_item_append_text(parameter_item, ", correlation ID: %u)", tvb_get_ntohl(parameter_tvb, CORRELATION_ID_OFFSET));
|
|
}
|
|
|
|
static void
|
|
dissect_del_ip_address_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *parameter_tree, proto_item *parameter_item)
|
|
{
|
|
guint16 address_length;
|
|
tvbuff_t *address_tvb;
|
|
|
|
address_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH - CORRELATION_ID_LENGTH;
|
|
|
|
proto_tree_add_item(parameter_tree, hf_correlation_id, parameter_tvb, CORRELATION_ID_OFFSET, CORRELATION_ID_LENGTH, REP_BIG_ENDIAN);
|
|
address_tvb = tvb_new_subset(parameter_tvb, ADDRESS_PARAMETER_OFFSET, address_length, address_length);
|
|
proto_item_append_text(parameter_item, " (Address: ");
|
|
dissect_parameter(address_tvb, pinfo, parameter_tree, parameter_item, FALSE);
|
|
proto_item_append_text(parameter_item, ", correlation ID: %u)", tvb_get_ntohl(parameter_tvb, CORRELATION_ID_OFFSET));
|
|
}
|
|
|
|
#define ERROR_CAUSE_IND_CASUES_OFFSET (CORRELATION_ID_OFFSET + CORRELATION_ID_LENGTH)
|
|
|
|
static void
|
|
dissect_error_cause_indication_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *parameter_tree)
|
|
{
|
|
guint16 causes_length;
|
|
tvbuff_t *causes_tvb;
|
|
|
|
proto_tree_add_item(parameter_tree, hf_correlation_id, parameter_tvb, CORRELATION_ID_OFFSET, CORRELATION_ID_LENGTH, REP_BIG_ENDIAN);
|
|
causes_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH - CORRELATION_ID_LENGTH;
|
|
causes_tvb = tvb_new_subset(parameter_tvb, ERROR_CAUSE_IND_CASUES_OFFSET, causes_length, causes_length);
|
|
dissect_error_causes(causes_tvb, pinfo, parameter_tree);
|
|
}
|
|
|
|
static void
|
|
dissect_set_primary_address_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *parameter_tree, proto_item *parameter_item)
|
|
{
|
|
guint16 address_length;
|
|
tvbuff_t *address_tvb;
|
|
|
|
address_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH - CORRELATION_ID_LENGTH;
|
|
|
|
proto_tree_add_item(parameter_tree, hf_correlation_id, parameter_tvb, CORRELATION_ID_OFFSET, CORRELATION_ID_LENGTH, REP_BIG_ENDIAN);
|
|
address_tvb = tvb_new_subset(parameter_tvb, ADDRESS_PARAMETER_OFFSET, address_length, address_length);
|
|
proto_item_append_text(parameter_item, " (Address: ");
|
|
dissect_parameter(address_tvb, pinfo, parameter_tree, parameter_item, FALSE);
|
|
proto_item_append_text(parameter_item, ", correlation ID: %u)", tvb_get_ntohl(parameter_tvb, CORRELATION_ID_OFFSET));
|
|
}
|
|
|
|
static void
|
|
dissect_success_report_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
|
|
{
|
|
proto_tree_add_item(parameter_tree, hf_correlation_id, parameter_tvb, CORRELATION_ID_OFFSET, CORRELATION_ID_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(parameter_item, " (Correlation ID: %u)", tvb_get_ntohl(parameter_tvb, CORRELATION_ID_OFFSET));
|
|
}
|
|
|
|
#define ADAP_INDICATION_LENGTH 4
|
|
#define ADAP_INDICATION_OFFSET PARAMETER_VALUE_OFFSET
|
|
|
|
static void
|
|
dissect_adap_indication_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
|
|
{
|
|
proto_tree_add_item(parameter_tree, hf_adap_indication, parameter_tvb, ADAP_INDICATION_OFFSET, ADAP_INDICATION_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(parameter_item, " (Indication: %u)", tvb_get_ntohl(parameter_tvb, ADAP_INDICATION_OFFSET));
|
|
}
|
|
|
|
static void
|
|
dissect_unknown_parameter(tvbuff_t *parameter_tvb, proto_tree *parameter_tree, proto_item *parameter_item)
|
|
{
|
|
guint16 type, parameter_value_length;
|
|
|
|
type = tvb_get_ntohs(parameter_tvb, PARAMETER_TYPE_OFFSET);
|
|
parameter_value_length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET) - PARAMETER_HEADER_LENGTH;
|
|
|
|
if (parameter_value_length > 0)
|
|
proto_tree_add_item(parameter_tree, hf_parameter_value, parameter_tvb, PARAMETER_VALUE_OFFSET, parameter_value_length, REP_BIG_ENDIAN);
|
|
|
|
proto_item_append_text(parameter_item, " (Type %u, value length: %u byte%s)", type, parameter_value_length, plurality(parameter_value_length, "", "s"));
|
|
}
|
|
|
|
#define HEARTBEAT_INFO_PARAMETER_ID 0x0001
|
|
#define IPV4ADDRESS_PARAMETER_ID 0x0005
|
|
#define IPV6ADDRESS_PARAMETER_ID 0x0006
|
|
#define STATE_COOKIE_PARAMETER_ID 0x0007
|
|
#define UNREC_PARA_PARAMETER_ID 0x0008
|
|
#define COOKIE_PRESERVATIVE_PARAMETER_ID 0x0009
|
|
#define HOSTNAME_ADDRESS_PARAMETER_ID 0x000b
|
|
#define SUPPORTED_ADDRESS_TYPES_PARAMETER_ID 0x000c
|
|
#define OUTGOING_SSN_RESET_REQUEST_PARAMETER_ID 0x000d
|
|
#define INCOMING_SSN_RESET_REQUEST_PARAMETER_ID 0x000e
|
|
#define SSN_TSN_RESET_REQUEST_PARAMETER_ID 0x000f
|
|
#define STREAM_RESET_RESPONSE_PARAMETER_ID 0x0010
|
|
#define ECN_PARAMETER_ID 0x8000
|
|
#define NONCE_SUPPORTED_PARAMETER_ID 0x8001
|
|
#define RANDOM_PARAMETER_ID 0x8002
|
|
#define CHUNKS_PARAMETER_ID 0x8003
|
|
#define HMAC_ALGO_PARAMETER_ID 0x8004
|
|
#define SUPPORTED_EXTENSIONS_PARAMETER_ID 0x8008
|
|
#define FORWARD_TSN_SUPPORTED_PARAMETER_ID 0xC000
|
|
#define ADD_IP_ADDRESS_PARAMETER_ID 0xC001
|
|
#define DEL_IP_ADDRESS_PARAMETER_ID 0xC002
|
|
#define ERROR_CAUSE_INDICATION_PARAMETER_ID 0xC003
|
|
#define SET_PRIMARY_ADDRESS_PARAMETER_ID 0xC004
|
|
#define SUCCESS_REPORT_PARAMETER_ID 0xC005
|
|
#define ADAP_LAYER_INDICATION_PARAMETER_ID 0xC006
|
|
|
|
static const value_string parameter_identifier_values[] = {
|
|
{ HEARTBEAT_INFO_PARAMETER_ID, "Heartbeat info" },
|
|
{ IPV4ADDRESS_PARAMETER_ID, "IPv4 address" },
|
|
{ IPV6ADDRESS_PARAMETER_ID, "IPv6 address" },
|
|
{ STATE_COOKIE_PARAMETER_ID, "State cookie" },
|
|
{ UNREC_PARA_PARAMETER_ID, "Unrecognized parameter" },
|
|
{ COOKIE_PRESERVATIVE_PARAMETER_ID, "Cookie preservative" },
|
|
{ HOSTNAME_ADDRESS_PARAMETER_ID, "Hostname address" },
|
|
{ OUTGOING_SSN_RESET_REQUEST_PARAMETER_ID, "Outgoing SSN reset request" },
|
|
{ INCOMING_SSN_RESET_REQUEST_PARAMETER_ID, "Incoming SSN reset request" },
|
|
{ SSN_TSN_RESET_REQUEST_PARAMETER_ID, "SSN/TSN reset request" },
|
|
{ STREAM_RESET_RESPONSE_PARAMETER_ID, "Stream reset response" },
|
|
{ SUPPORTED_ADDRESS_TYPES_PARAMETER_ID, "Supported address types" },
|
|
{ ECN_PARAMETER_ID, "ECN" },
|
|
{ NONCE_SUPPORTED_PARAMETER_ID, "Nonce supported" },
|
|
{ RANDOM_PARAMETER_ID, "Random" },
|
|
{ CHUNKS_PARAMETER_ID, "Authenticated Chunk list" },
|
|
{ HMAC_ALGO_PARAMETER_ID, "Requested HMAC Algorithm" },
|
|
{ SUPPORTED_EXTENSIONS_PARAMETER_ID, "Supported Extensions" },
|
|
{ FORWARD_TSN_SUPPORTED_PARAMETER_ID, "Forward TSN supported" },
|
|
{ ADD_IP_ADDRESS_PARAMETER_ID, "Add IP address" },
|
|
{ DEL_IP_ADDRESS_PARAMETER_ID, "Delete IP address" },
|
|
{ ERROR_CAUSE_INDICATION_PARAMETER_ID, "Error cause indication" },
|
|
{ SET_PRIMARY_ADDRESS_PARAMETER_ID, "Set primary address" },
|
|
{ SUCCESS_REPORT_PARAMETER_ID, "Success report" },
|
|
{ ADAP_LAYER_INDICATION_PARAMETER_ID, "Adaptation Layer Indication" },
|
|
{ 0, NULL } };
|
|
|
|
#define SCTP_PARAMETER_BIT_1 0x8000
|
|
#define SCTP_PARAMETER_BIT_2 0x4000
|
|
|
|
static const true_false_string sctp_parameter_bit_1_value = {
|
|
"Skip parameter and continue processing of the chunk",
|
|
"Stop processing of chunk"
|
|
};
|
|
|
|
static const true_false_string sctp_parameter_bit_2_value = {
|
|
"Do report",
|
|
"Do not report"
|
|
};
|
|
|
|
static void
|
|
dissect_parameter(tvbuff_t *parameter_tvb, packet_info *pinfo, proto_tree *chunk_tree, proto_item *additional_item, gboolean dissecting_init_init_ack_chunk)
|
|
{
|
|
guint16 type, length, padding_length;
|
|
proto_item *parameter_item;
|
|
proto_tree *parameter_tree;
|
|
proto_item *type_item;
|
|
proto_tree *type_tree;
|
|
|
|
type = tvb_get_ntohs(parameter_tvb, PARAMETER_TYPE_OFFSET);
|
|
length = tvb_get_ntohs(parameter_tvb, PARAMETER_LENGTH_OFFSET);
|
|
padding_length = tvb_length(parameter_tvb) - length;
|
|
|
|
if (!(chunk_tree || (dissecting_init_init_ack_chunk && (type == IPV4ADDRESS_PARAMETER_ID || type == IPV6ADDRESS_PARAMETER_ID))))
|
|
return;
|
|
|
|
if (chunk_tree) {
|
|
parameter_item = proto_tree_add_text(chunk_tree, parameter_tvb, PARAMETER_HEADER_OFFSET, tvb_length(parameter_tvb), "%s parameter", val_to_str(type, parameter_identifier_values, "Unknown"));
|
|
parameter_tree = proto_item_add_subtree(parameter_item, ett_sctp_chunk_parameter);
|
|
|
|
type_item = proto_tree_add_item(parameter_tree, hf_parameter_type, parameter_tvb, PARAMETER_TYPE_OFFSET, PARAMETER_TYPE_LENGTH, REP_BIG_ENDIAN);
|
|
type_tree = proto_item_add_subtree(type_item, ett_sctp_parameter_type);
|
|
proto_tree_add_item(type_tree, hf_parameter_bit_1, parameter_tvb, PARAMETER_TYPE_OFFSET, PARAMETER_TYPE_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(type_tree, hf_parameter_bit_2, parameter_tvb, PARAMETER_TYPE_OFFSET, PARAMETER_TYPE_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(parameter_tree, hf_parameter_length, parameter_tvb, PARAMETER_LENGTH_OFFSET, PARAMETER_LENGTH_LENGTH, REP_BIG_ENDIAN);
|
|
} else {
|
|
parameter_item = NULL;
|
|
parameter_tree = NULL;
|
|
}
|
|
|
|
switch(type) {
|
|
case HEARTBEAT_INFO_PARAMETER_ID:
|
|
dissect_heartbeat_info_parameter(parameter_tvb, parameter_tree, parameter_item);
|
|
break;
|
|
case IPV4ADDRESS_PARAMETER_ID:
|
|
dissect_ipv4_parameter(parameter_tvb, parameter_tree, parameter_item, additional_item, dissecting_init_init_ack_chunk);
|
|
break;
|
|
case IPV6ADDRESS_PARAMETER_ID:
|
|
dissect_ipv6_parameter(parameter_tvb, parameter_tree, parameter_item, additional_item, dissecting_init_init_ack_chunk);
|
|
break;
|
|
case STATE_COOKIE_PARAMETER_ID:
|
|
dissect_state_cookie_parameter(parameter_tvb, parameter_tree, parameter_item);
|
|
break;
|
|
case UNREC_PARA_PARAMETER_ID:
|
|
dissect_unrecognized_parameters_parameter(parameter_tvb, pinfo, parameter_tree);
|
|
break;
|
|
case COOKIE_PRESERVATIVE_PARAMETER_ID:
|
|
dissect_cookie_preservative_parameter(parameter_tvb, parameter_tree, parameter_item);
|
|
break;
|
|
case HOSTNAME_ADDRESS_PARAMETER_ID:
|
|
dissect_hostname_parameter(parameter_tvb, parameter_tree, parameter_item);
|
|
break;
|
|
case SUPPORTED_ADDRESS_TYPES_PARAMETER_ID:
|
|
dissect_supported_address_types_parameter(parameter_tvb, parameter_tree, parameter_item);
|
|
break;
|
|
case OUTGOING_SSN_RESET_REQUEST_PARAMETER_ID:
|
|
dissect_outgoing_ssn_reset_request_parameter(parameter_tvb, parameter_tree, parameter_item);
|
|
break;
|
|
case INCOMING_SSN_RESET_REQUEST_PARAMETER_ID:
|
|
dissect_incoming_ssn_reset_request_parameter(parameter_tvb, parameter_tree, parameter_item);
|
|
break;
|
|
case SSN_TSN_RESET_REQUEST_PARAMETER_ID:
|
|
dissect_ssn_tsn_reset_request_parameter(parameter_tvb, parameter_tree, parameter_item);
|
|
break;
|
|
case STREAM_RESET_RESPONSE_PARAMETER_ID:
|
|
dissect_stream_reset_response_parameter(parameter_tvb, parameter_tree, parameter_item);
|
|
break;
|
|
case ECN_PARAMETER_ID:
|
|
dissect_ecn_parameter(parameter_tvb);
|
|
break;
|
|
case NONCE_SUPPORTED_PARAMETER_ID:
|
|
dissect_nonce_supported_parameter(parameter_tvb);
|
|
break;
|
|
case RANDOM_PARAMETER_ID:
|
|
dissect_random_parameter(parameter_tvb, parameter_tree);
|
|
break;
|
|
case CHUNKS_PARAMETER_ID:
|
|
dissect_chunks_parameter(parameter_tvb, parameter_tree);
|
|
break;
|
|
case HMAC_ALGO_PARAMETER_ID:
|
|
dissect_hmac_algo_parameter(parameter_tvb, parameter_tree);
|
|
break;
|
|
case SUPPORTED_EXTENSIONS_PARAMETER_ID:
|
|
dissect_supported_extensions_parameter(parameter_tvb, parameter_tree, parameter_item);
|
|
break;
|
|
case FORWARD_TSN_SUPPORTED_PARAMETER_ID:
|
|
dissect_forward_tsn_supported_parameter(parameter_tvb);
|
|
break;
|
|
case ADD_IP_ADDRESS_PARAMETER_ID:
|
|
dissect_add_ip_address_parameter(parameter_tvb, pinfo, parameter_tree, parameter_item);
|
|
break;
|
|
case DEL_IP_ADDRESS_PARAMETER_ID:
|
|
dissect_del_ip_address_parameter(parameter_tvb, pinfo, parameter_tree, parameter_item);
|
|
break;
|
|
case ERROR_CAUSE_INDICATION_PARAMETER_ID:
|
|
dissect_error_cause_indication_parameter(parameter_tvb, pinfo, parameter_tree);
|
|
break;
|
|
case SET_PRIMARY_ADDRESS_PARAMETER_ID:
|
|
dissect_set_primary_address_parameter(parameter_tvb, pinfo, parameter_tree, parameter_item);
|
|
break;
|
|
case SUCCESS_REPORT_PARAMETER_ID:
|
|
dissect_success_report_parameter(parameter_tvb, parameter_tree, parameter_item);
|
|
break;
|
|
case ADAP_LAYER_INDICATION_PARAMETER_ID:
|
|
dissect_adap_indication_parameter(parameter_tvb, parameter_tree, parameter_item);
|
|
break;
|
|
default:
|
|
dissect_unknown_parameter(parameter_tvb, parameter_tree, parameter_item);
|
|
break;
|
|
}
|
|
|
|
if (padding_length > 0)
|
|
proto_tree_add_item(parameter_tree, hf_parameter_padding, parameter_tvb, PARAMETER_HEADER_OFFSET + length, padding_length, REP_BIG_ENDIAN);
|
|
}
|
|
|
|
static void
|
|
dissect_parameters(tvbuff_t *parameters_tvb, packet_info *pinfo, proto_tree *tree, proto_item *additional_item, gboolean dissecting_init_init_ack_chunk)
|
|
{
|
|
gint offset, length, total_length, remaining_length;
|
|
tvbuff_t *parameter_tvb;
|
|
|
|
offset = 0;
|
|
while((remaining_length = tvb_length_remaining(parameters_tvb, offset))) {
|
|
if ((offset > 0) && additional_item)
|
|
proto_item_append_text(additional_item, " ");
|
|
length = tvb_get_ntohs(parameters_tvb, offset + PARAMETER_LENGTH_OFFSET);
|
|
total_length = ADD_PADDING(length);
|
|
if (remaining_length >= length)
|
|
total_length = MIN(total_length, remaining_length);
|
|
/* create a tvb for the parameter including the padding bytes */
|
|
parameter_tvb = tvb_new_subset(parameters_tvb, offset, total_length, total_length);
|
|
dissect_parameter(parameter_tvb, pinfo, tree, additional_item, dissecting_init_init_ack_chunk);
|
|
/* get rid of the handled parameter */
|
|
offset += total_length;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Code to handle error causes for ABORT and ERROR chunks
|
|
*/
|
|
|
|
|
|
#define CAUSE_CODE_LENGTH 2
|
|
#define CAUSE_LENGTH_LENGTH 2
|
|
#define CAUSE_HEADER_LENGTH (CAUSE_CODE_LENGTH + CAUSE_LENGTH_LENGTH)
|
|
|
|
#define CAUSE_HEADER_OFFSET 0
|
|
#define CAUSE_CODE_OFFSET CAUSE_HEADER_OFFSET
|
|
#define CAUSE_LENGTH_OFFSET (CAUSE_CODE_OFFSET + CAUSE_CODE_LENGTH)
|
|
#define CAUSE_INFO_OFFSET (CAUSE_LENGTH_OFFSET + CAUSE_LENGTH_LENGTH)
|
|
|
|
|
|
#define CAUSE_STREAM_IDENTIFIER_LENGTH 2
|
|
#define CAUSE_RESERVED_LENGTH 2
|
|
#define CAUSE_STREAM_IDENTIFIER_OFFSET CAUSE_INFO_OFFSET
|
|
#define CAUSE_RESERVED_OFFSET (CAUSE_STREAM_IDENTIFIER_OFFSET + CAUSE_STREAM_IDENTIFIER_LENGTH)
|
|
|
|
static void
|
|
dissect_invalid_stream_identifier_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item)
|
|
{
|
|
proto_tree_add_item(cause_tree, hf_cause_stream_identifier, cause_tvb, CAUSE_STREAM_IDENTIFIER_OFFSET, CAUSE_STREAM_IDENTIFIER_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(cause_tree, hf_cause_reserved, cause_tvb, CAUSE_RESERVED_OFFSET, CAUSE_RESERVED_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(cause_item, " (SID: %u)", tvb_get_ntohs(cause_tvb, CAUSE_STREAM_IDENTIFIER_OFFSET));
|
|
}
|
|
|
|
#define CAUSE_NUMBER_OF_MISSING_PARAMETERS_LENGTH 4
|
|
#define CAUSE_MISSING_PARAMETER_TYPE_LENGTH 2
|
|
|
|
#define CAUSE_NUMBER_OF_MISSING_PARAMETERS_OFFSET CAUSE_INFO_OFFSET
|
|
#define CAUSE_FIRST_MISSING_PARAMETER_TYPE_OFFSET (CAUSE_NUMBER_OF_MISSING_PARAMETERS_OFFSET + \
|
|
CAUSE_NUMBER_OF_MISSING_PARAMETERS_LENGTH )
|
|
|
|
static void
|
|
dissect_missing_mandatory_parameters_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree)
|
|
{
|
|
guint32 number_of_missing_parameters, missing_parameter_number;
|
|
guint offset;
|
|
|
|
number_of_missing_parameters = tvb_get_ntohl(cause_tvb, CAUSE_NUMBER_OF_MISSING_PARAMETERS_OFFSET);
|
|
proto_tree_add_item(cause_tree, hf_cause_number_of_missing_parameters, cause_tvb, CAUSE_NUMBER_OF_MISSING_PARAMETERS_OFFSET, CAUSE_NUMBER_OF_MISSING_PARAMETERS_LENGTH, REP_BIG_ENDIAN);
|
|
offset = CAUSE_FIRST_MISSING_PARAMETER_TYPE_OFFSET;
|
|
for(missing_parameter_number = 1; missing_parameter_number <= number_of_missing_parameters; missing_parameter_number++) {
|
|
proto_tree_add_item(cause_tree, hf_cause_missing_parameter_type, cause_tvb, offset, CAUSE_MISSING_PARAMETER_TYPE_LENGTH, REP_BIG_ENDIAN);
|
|
offset += CAUSE_MISSING_PARAMETER_TYPE_LENGTH;
|
|
}
|
|
}
|
|
|
|
#define CAUSE_MEASURE_OF_STALENESS_LENGTH 4
|
|
#define CAUSE_MEASURE_OF_STALENESS_OFFSET CAUSE_INFO_OFFSET
|
|
|
|
static void
|
|
dissect_stale_cookie_error_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item)
|
|
{
|
|
proto_tree_add_item(cause_tree, hf_cause_measure_of_staleness, cause_tvb, CAUSE_MEASURE_OF_STALENESS_OFFSET, CAUSE_MEASURE_OF_STALENESS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(cause_item, " (Measure: %u usec)", tvb_get_ntohl(cause_tvb, CAUSE_MEASURE_OF_STALENESS_OFFSET));
|
|
}
|
|
|
|
static void
|
|
dissect_out_of_resource_cause(tvbuff_t *cause_tvb _U_)
|
|
{
|
|
}
|
|
|
|
static void
|
|
dissect_unresolvable_address_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree *cause_tree, proto_item *cause_item)
|
|
{
|
|
guint16 parameter_length;
|
|
tvbuff_t *parameter_tvb;
|
|
|
|
parameter_length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET) - CAUSE_HEADER_LENGTH;
|
|
parameter_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, parameter_length, parameter_length);
|
|
proto_item_append_text(cause_item, " (Address: ");
|
|
dissect_parameter(parameter_tvb, pinfo, cause_tree, cause_item, FALSE);
|
|
proto_item_append_text(cause_item, ")");
|
|
}
|
|
|
|
static gboolean
|
|
dissect_sctp_chunk(tvbuff_t *chunk_tvb,
|
|
packet_info *pinfo,
|
|
proto_tree *tree,
|
|
proto_tree *sctp_tree,
|
|
sctp_half_assoc_t* assoc,
|
|
gboolean useinfo);
|
|
|
|
static void
|
|
dissect_unrecognized_chunk_type_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree *cause_tree, proto_item *cause_item)
|
|
{
|
|
guint16 chunk_length;
|
|
guint8 unrecognized_type;
|
|
tvbuff_t *unrecognized_chunk_tvb;
|
|
|
|
chunk_length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET) - CAUSE_HEADER_LENGTH;
|
|
unrecognized_chunk_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, chunk_length, chunk_length);
|
|
dissect_sctp_chunk(unrecognized_chunk_tvb, pinfo, cause_tree,cause_tree, NULL, FALSE);
|
|
unrecognized_type = tvb_get_guint8(unrecognized_chunk_tvb, CHUNK_TYPE_OFFSET);
|
|
proto_item_append_text(cause_item, " (Type: %u (%s))", unrecognized_type, val_to_str(unrecognized_type, chunk_type_values, "unknown"));
|
|
}
|
|
|
|
static void
|
|
dissect_invalid_mandatory_parameter_cause(tvbuff_t *cause_tvb _U_)
|
|
{
|
|
}
|
|
|
|
static void
|
|
dissect_unrecognized_parameters_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree *cause_tree)
|
|
{
|
|
guint16 cause_info_length;
|
|
tvbuff_t *unrecognized_parameters_tvb;
|
|
|
|
cause_info_length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET) - CAUSE_HEADER_LENGTH;
|
|
|
|
unrecognized_parameters_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, cause_info_length);
|
|
dissect_parameters(unrecognized_parameters_tvb, pinfo, cause_tree, NULL, FALSE);
|
|
}
|
|
|
|
#define CAUSE_TSN_LENGTH 4
|
|
#define CAUSE_TSN_OFFSET CAUSE_INFO_OFFSET
|
|
|
|
static void
|
|
dissect_no_user_data_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item)
|
|
{
|
|
proto_tree_add_item(cause_tree, hf_cause_tsn, cause_tvb, CAUSE_TSN_OFFSET, CAUSE_TSN_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(cause_item, " (TSN: %u)", tvb_get_ntohl(cause_tvb, CAUSE_TSN_OFFSET));
|
|
}
|
|
|
|
static void
|
|
dissect_cookie_received_while_shutting_down_cause(tvbuff_t *cause_tvb _U_)
|
|
{
|
|
}
|
|
|
|
static void
|
|
dissect_restart_with_new_address_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree* cause_tree, proto_item *cause_item)
|
|
{
|
|
guint16 cause_info_length;
|
|
tvbuff_t *parameter_tvb;
|
|
|
|
cause_info_length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET) - CAUSE_HEADER_LENGTH;
|
|
parameter_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, cause_info_length);
|
|
proto_item_append_text(cause_item, " (New addresses: ");
|
|
dissect_parameters(parameter_tvb, pinfo, cause_tree, cause_item, FALSE);
|
|
proto_item_append_text(cause_item, ")");
|
|
}
|
|
|
|
static void
|
|
dissect_user_initiated_abort_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree)
|
|
{
|
|
guint16 cause_info_length;
|
|
|
|
cause_info_length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET) - CAUSE_HEADER_LENGTH;
|
|
if (cause_info_length > 0)
|
|
proto_tree_add_item(cause_tree, hf_cause_info, cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, REP_BIG_ENDIAN);
|
|
}
|
|
|
|
static void
|
|
dissect_protocol_violation_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree)
|
|
{
|
|
guint16 cause_info_length;
|
|
|
|
cause_info_length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET) - CAUSE_HEADER_LENGTH;
|
|
if (cause_info_length > 0)
|
|
proto_tree_add_item(cause_tree, hf_cause_info, cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, REP_BIG_ENDIAN);
|
|
}
|
|
|
|
static void
|
|
dissect_delete_last_address_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree *cause_tree, proto_item *cause_item)
|
|
{
|
|
guint16 cause_info_length;
|
|
tvbuff_t *parameter_tvb;
|
|
|
|
cause_info_length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET) - CAUSE_HEADER_LENGTH;
|
|
parameter_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, cause_info_length);
|
|
proto_item_append_text(cause_item, " (Last address: ");
|
|
dissect_parameter(parameter_tvb, pinfo, cause_tree, cause_item, FALSE);
|
|
proto_item_append_text(cause_item, ")");
|
|
}
|
|
|
|
static void
|
|
dissect_resource_outage_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree *cause_tree)
|
|
{
|
|
guint16 cause_info_length;
|
|
tvbuff_t *parameter_tvb;
|
|
|
|
cause_info_length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET) - CAUSE_HEADER_LENGTH;
|
|
parameter_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, cause_info_length);
|
|
dissect_parameter(parameter_tvb, pinfo, cause_tree, NULL, FALSE);
|
|
}
|
|
|
|
static void
|
|
dissect_delete_source_address_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree *cause_tree, proto_item *cause_item)
|
|
{
|
|
guint16 cause_info_length;
|
|
tvbuff_t *parameter_tvb;
|
|
|
|
cause_info_length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET) - CAUSE_HEADER_LENGTH;
|
|
parameter_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, cause_info_length);
|
|
proto_item_append_text(cause_item, " (Deleted address: ");
|
|
dissect_parameter(parameter_tvb, pinfo, cause_tree, cause_item, FALSE);
|
|
proto_item_append_text(cause_item, ")");
|
|
}
|
|
|
|
static void
|
|
dissect_request_refused_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree *cause_tree)
|
|
{
|
|
guint16 cause_info_length;
|
|
tvbuff_t *parameter_tvb;
|
|
|
|
cause_info_length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET) - CAUSE_HEADER_LENGTH;
|
|
parameter_tvb = tvb_new_subset(cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, cause_info_length);
|
|
dissect_parameter(parameter_tvb, pinfo, cause_tree, NULL, FALSE);
|
|
}
|
|
|
|
static void
|
|
dissect_unsupported_hmac_id_cause(tvbuff_t *cause_tvb, packet_info *pinfo _U_, proto_tree *cause_tree)
|
|
{
|
|
proto_tree_add_item(cause_tree, hf_hmac_id, cause_tvb, CAUSE_INFO_OFFSET, HMAC_ID_LENGTH, REP_BIG_ENDIAN);
|
|
}
|
|
|
|
static void
|
|
dissect_unknown_cause(tvbuff_t *cause_tvb, proto_tree *cause_tree, proto_item *cause_item)
|
|
{
|
|
guint16 cause_info_length;
|
|
|
|
cause_info_length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET) - CAUSE_HEADER_LENGTH;
|
|
if (cause_info_length > 0)
|
|
proto_tree_add_item(cause_tree, hf_cause_info, cause_tvb, CAUSE_INFO_OFFSET, cause_info_length, REP_BIG_ENDIAN);
|
|
proto_item_append_text(cause_item, " (Code: %u, information length: %u byte%s)", tvb_get_ntohs(cause_tvb, CAUSE_CODE_OFFSET), cause_info_length, plurality(cause_info_length, "", "s"));
|
|
}
|
|
|
|
#define INVALID_STREAM_IDENTIFIER 0x01
|
|
#define MISSING_MANDATORY_PARAMETERS 0x02
|
|
#define STALE_COOKIE_ERROR 0x03
|
|
#define OUT_OF_RESOURCE 0x04
|
|
#define UNRESOLVABLE_ADDRESS 0x05
|
|
#define UNRECOGNIZED_CHUNK_TYPE 0x06
|
|
#define INVALID_MANDATORY_PARAMETER 0x07
|
|
#define UNRECOGNIZED_PARAMETERS 0x08
|
|
#define NO_USER_DATA 0x09
|
|
#define COOKIE_RECEIVED_WHILE_SHUTTING_DOWN 0x0a
|
|
#define RESTART_WITH_NEW_ADDRESSES 0x0b
|
|
#define USER_INITIATED_ABORT 0x0c
|
|
#define PROTOCOL_VIOLATION 0x0d
|
|
#define REQUEST_TO_DELETE_LAST_ADDRESS 0x00a0
|
|
#define OPERATION_REFUSED_DUE_TO_RESOURCE_SHORTAGE 0x00a1
|
|
#define REQUEST_TO_DELETE_SOURCE_ADDRESS 0x00a2
|
|
#define ABORT_DUE_TO_ILLEGAL_ASCONF 0x00a3
|
|
#define REQUEST_REFUSED 0x00a4
|
|
#define UNSUPPORTED_HMAC_ID 0x0105
|
|
|
|
static const value_string cause_code_values[] = {
|
|
{ INVALID_STREAM_IDENTIFIER, "Invalid stream identifier" },
|
|
{ MISSING_MANDATORY_PARAMETERS, "Missing mandatory parameter" },
|
|
{ STALE_COOKIE_ERROR, "Stale cookie error" },
|
|
{ OUT_OF_RESOURCE, "Out of resource" },
|
|
{ UNRESOLVABLE_ADDRESS, "Unresolvable address" },
|
|
{ UNRECOGNIZED_CHUNK_TYPE, "Unrecognized chunk type" },
|
|
{ INVALID_MANDATORY_PARAMETER, "Invalid mandatory parameter" },
|
|
{ UNRECOGNIZED_PARAMETERS, "Unrecognized parameters" },
|
|
{ NO_USER_DATA, "No user data" },
|
|
{ COOKIE_RECEIVED_WHILE_SHUTTING_DOWN, "Cookie received while shutting down" },
|
|
{ RESTART_WITH_NEW_ADDRESSES, "Restart of an association with new addresses" },
|
|
{ USER_INITIATED_ABORT, "User initiated ABORT" },
|
|
{ PROTOCOL_VIOLATION, "Protocol violation" },
|
|
{ REQUEST_TO_DELETE_LAST_ADDRESS, "Request to delete last address" },
|
|
{ OPERATION_REFUSED_DUE_TO_RESOURCE_SHORTAGE, "Operation refused due to resource shortage" },
|
|
{ REQUEST_TO_DELETE_SOURCE_ADDRESS, "Request to delete source address" },
|
|
{ ABORT_DUE_TO_ILLEGAL_ASCONF, "Association Aborted due to illegal ASCONF-ACK" },
|
|
{ REQUEST_REFUSED, "Request refused - no authorization" },
|
|
{ UNSUPPORTED_HMAC_ID, "Unsupported HMAC identifier" },
|
|
{ 0, NULL } };
|
|
|
|
|
|
static void
|
|
dissect_error_cause(tvbuff_t *cause_tvb, packet_info *pinfo, proto_tree *chunk_tree)
|
|
{
|
|
guint16 code, length, padding_length;
|
|
proto_item *cause_item;
|
|
proto_tree *cause_tree;
|
|
|
|
code = tvb_get_ntohs(cause_tvb, CAUSE_CODE_OFFSET);
|
|
length = tvb_get_ntohs(cause_tvb, CAUSE_LENGTH_OFFSET);
|
|
padding_length = tvb_length(cause_tvb) - length;
|
|
|
|
cause_item = proto_tree_add_text(chunk_tree, cause_tvb, CAUSE_HEADER_OFFSET, tvb_length(cause_tvb), "%s cause", val_to_str(code, cause_code_values, "Unknown"));
|
|
cause_tree = proto_item_add_subtree(cause_item, ett_sctp_chunk_cause);
|
|
|
|
proto_tree_add_item(cause_tree, hf_cause_code, cause_tvb, CAUSE_CODE_OFFSET, CAUSE_CODE_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(cause_tree, hf_cause_length, cause_tvb, CAUSE_LENGTH_OFFSET, CAUSE_LENGTH_LENGTH, REP_BIG_ENDIAN);
|
|
|
|
switch(code) {
|
|
case INVALID_STREAM_IDENTIFIER:
|
|
dissect_invalid_stream_identifier_cause(cause_tvb, cause_tree, cause_item);
|
|
break;
|
|
case MISSING_MANDATORY_PARAMETERS:
|
|
dissect_missing_mandatory_parameters_cause(cause_tvb, cause_tree);
|
|
break;
|
|
case STALE_COOKIE_ERROR:
|
|
dissect_stale_cookie_error_cause(cause_tvb, cause_tree, cause_item);
|
|
break;
|
|
case OUT_OF_RESOURCE:
|
|
dissect_out_of_resource_cause(cause_tvb);
|
|
break;
|
|
case UNRESOLVABLE_ADDRESS:
|
|
dissect_unresolvable_address_cause(cause_tvb, pinfo, cause_tree, cause_item);
|
|
break;
|
|
case UNRECOGNIZED_CHUNK_TYPE:
|
|
dissect_unrecognized_chunk_type_cause(cause_tvb, pinfo, cause_tree, cause_item);
|
|
break;
|
|
case INVALID_MANDATORY_PARAMETER:
|
|
dissect_invalid_mandatory_parameter_cause(cause_tvb);
|
|
break;
|
|
case UNRECOGNIZED_PARAMETERS:
|
|
dissect_unrecognized_parameters_cause(cause_tvb, pinfo, cause_tree);
|
|
break;
|
|
case NO_USER_DATA:
|
|
dissect_no_user_data_cause(cause_tvb, cause_tree, cause_item);
|
|
break;
|
|
case COOKIE_RECEIVED_WHILE_SHUTTING_DOWN:
|
|
dissect_cookie_received_while_shutting_down_cause(cause_tvb);
|
|
break;
|
|
case RESTART_WITH_NEW_ADDRESSES:
|
|
dissect_restart_with_new_address_cause(cause_tvb, pinfo, cause_tree, cause_item);
|
|
break;
|
|
case USER_INITIATED_ABORT:
|
|
dissect_user_initiated_abort_cause(cause_tvb, cause_tree);
|
|
break;
|
|
case PROTOCOL_VIOLATION:
|
|
dissect_protocol_violation_cause(cause_tvb, cause_tree);
|
|
break;
|
|
case REQUEST_TO_DELETE_LAST_ADDRESS:
|
|
dissect_delete_last_address_cause(cause_tvb, pinfo, cause_tree, cause_item);
|
|
break;
|
|
case OPERATION_REFUSED_DUE_TO_RESOURCE_SHORTAGE:
|
|
dissect_resource_outage_cause(cause_tvb, pinfo, cause_tree);
|
|
break;
|
|
case REQUEST_TO_DELETE_SOURCE_ADDRESS:
|
|
dissect_delete_source_address_cause(cause_tvb, pinfo, cause_tree, cause_item);
|
|
break;
|
|
case REQUEST_REFUSED:
|
|
dissect_request_refused_cause(cause_tvb, pinfo, cause_tree);
|
|
break;
|
|
case UNSUPPORTED_HMAC_ID:
|
|
dissect_unsupported_hmac_id_cause(cause_tvb, pinfo, cause_tree);
|
|
break;
|
|
default:
|
|
dissect_unknown_cause(cause_tvb, cause_tree, cause_item);
|
|
break;
|
|
}
|
|
|
|
if (padding_length > 0)
|
|
proto_tree_add_item(cause_tree, hf_cause_padding, cause_tvb, CAUSE_HEADER_OFFSET + length, padding_length, REP_BIG_ENDIAN);
|
|
}
|
|
|
|
static void
|
|
dissect_error_causes(tvbuff_t *causes_tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
gint offset, length, total_length, remaining_length;
|
|
tvbuff_t *cause_tvb;
|
|
|
|
offset = 0;
|
|
while((remaining_length = tvb_length_remaining(causes_tvb, offset))) {
|
|
length = tvb_get_ntohs(causes_tvb, offset + CAUSE_LENGTH_OFFSET);
|
|
total_length = ADD_PADDING(length);
|
|
if (remaining_length >= length)
|
|
total_length = MIN(total_length, remaining_length);
|
|
/* create a tvb for the parameter including the padding bytes */
|
|
cause_tvb = tvb_new_subset(causes_tvb, offset, total_length, total_length);
|
|
dissect_error_cause(cause_tvb, pinfo, tree);
|
|
/* get rid of the handled cause */
|
|
offset += total_length;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Code to actually dissect the packets
|
|
*/
|
|
|
|
static gboolean try_heuristic_first = FALSE;
|
|
|
|
static gboolean
|
|
dissect_payload(tvbuff_t *payload_tvb, packet_info *pinfo, proto_tree *tree, guint32 ppi)
|
|
{
|
|
guint32 low_port, high_port;
|
|
|
|
pinfo->ppid = ppi;
|
|
|
|
if (enable_ulp_dissection) {
|
|
if (try_heuristic_first) {
|
|
/* do lookup with the heuristic subdissector table */
|
|
if (dissector_try_heuristic(sctp_heur_subdissector_list, payload_tvb, pinfo, tree))
|
|
return TRUE;
|
|
}
|
|
|
|
/* Do lookups with the subdissector table.
|
|
|
|
When trying port numbers, we try the port number with the lower value
|
|
first, followed by the port number with the higher value. This means
|
|
that, for packets where a dissector is registered for *both* port
|
|
numbers, and where there's no match on the PPI:
|
|
|
|
1) we pick the same dissector for traffic going in both directions;
|
|
|
|
2) we prefer the port number that's more likely to be the right
|
|
one (as that prefers well-known ports to reserved ports);
|
|
|
|
although there is, of course, no guarantee that any such strategy
|
|
will always pick the right port number.
|
|
|
|
XXX - we ignore port numbers of 0, as some dissectors use a port
|
|
number of 0 to disable the port. */
|
|
if (dissector_try_port(sctp_ppi_dissector_table, ppi, payload_tvb, pinfo, tree))
|
|
return TRUE;
|
|
if (pinfo->srcport > pinfo->destport) {
|
|
low_port = pinfo->destport;
|
|
high_port = pinfo->srcport;
|
|
} else {
|
|
low_port = pinfo->srcport;
|
|
high_port = pinfo->destport;
|
|
}
|
|
if (low_port != 0 &&
|
|
dissector_try_port(sctp_port_dissector_table, low_port, payload_tvb, pinfo, tree))
|
|
return TRUE;
|
|
if (high_port != 0 &&
|
|
dissector_try_port(sctp_port_dissector_table, high_port, payload_tvb, pinfo, tree))
|
|
return TRUE;
|
|
|
|
if (!try_heuristic_first) {
|
|
/* do lookup with the heuristic subdissector table */
|
|
if (dissector_try_heuristic(sctp_heur_subdissector_list, payload_tvb, pinfo, tree))
|
|
return TRUE;
|
|
}
|
|
}
|
|
/* Oh, well, we don't know this; dissect it as data. */
|
|
call_dissector(data_handle, payload_tvb, pinfo, tree);
|
|
return TRUE;
|
|
}
|
|
|
|
#define DATA_CHUNK_TSN_LENGTH 4
|
|
#define DATA_CHUNK_STREAM_ID_LENGTH 2
|
|
#define DATA_CHUNK_STREAM_SEQ_NUMBER_LENGTH 2
|
|
#define DATA_CHUNK_PAYLOAD_PROTOCOL_ID_LENGTH 4
|
|
|
|
#define DATA_CHUNK_TSN_OFFSET (CHUNK_VALUE_OFFSET + 0)
|
|
#define DATA_CHUNK_STREAM_ID_OFFSET (DATA_CHUNK_TSN_OFFSET + DATA_CHUNK_TSN_LENGTH)
|
|
#define DATA_CHUNK_STREAM_SEQ_NUMBER_OFFSET (DATA_CHUNK_STREAM_ID_OFFSET + \
|
|
DATA_CHUNK_STREAM_SEQ_NUMBER_LENGTH)
|
|
#define DATA_CHUNK_PAYLOAD_PROTOCOL_ID_OFFSET (DATA_CHUNK_STREAM_SEQ_NUMBER_OFFSET + \
|
|
DATA_CHUNK_STREAM_SEQ_NUMBER_LENGTH)
|
|
#define DATA_CHUNK_PAYLOAD_OFFSET (DATA_CHUNK_PAYLOAD_PROTOCOL_ID_OFFSET + \
|
|
DATA_CHUNK_PAYLOAD_PROTOCOL_ID_LENGTH)
|
|
|
|
#define DATA_CHUNK_HEADER_LENGTH (CHUNK_HEADER_LENGTH + \
|
|
DATA_CHUNK_TSN_LENGTH + \
|
|
DATA_CHUNK_STREAM_ID_LENGTH + \
|
|
DATA_CHUNK_STREAM_SEQ_NUMBER_LENGTH + \
|
|
DATA_CHUNK_PAYLOAD_PROTOCOL_ID_LENGTH)
|
|
|
|
#define SCTP_DATA_CHUNK_E_BIT 0x01
|
|
#define SCTP_DATA_CHUNK_B_BIT 0x02
|
|
#define SCTP_DATA_CHUNK_U_BIT 0x04
|
|
#define SCTP_DATA_CHUNK_I_BIT 0x08
|
|
|
|
/* table to hold fragmented SCTP messages */
|
|
static GHashTable *frag_table = NULL;
|
|
|
|
|
|
typedef struct _frag_key {
|
|
guint16 sport;
|
|
guint16 dport;
|
|
guint32 verification_tag;
|
|
guint16 stream_id;
|
|
guint16 stream_seq_num;
|
|
} frag_key;
|
|
|
|
|
|
static gint
|
|
frag_equal(gconstpointer k1, gconstpointer k2)
|
|
{
|
|
const frag_key* key1 = (const frag_key*) k1;
|
|
const frag_key* key2 = (const frag_key*) k2;
|
|
|
|
return ( (key1->sport == key2->sport) &&
|
|
(key1->dport == key1->dport) &&
|
|
(key1->verification_tag == key1->verification_tag) &&
|
|
(key1->stream_id == key1->stream_id) &&
|
|
(key1->stream_seq_num == key1->stream_seq_num)
|
|
? TRUE : FALSE);
|
|
}
|
|
|
|
|
|
static guint
|
|
frag_hash(gconstpointer k)
|
|
{
|
|
const frag_key* key = (const frag_key*) k;
|
|
|
|
return key->sport ^ key->dport ^ key->verification_tag ^
|
|
key->stream_id ^ key->stream_seq_num;
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
frag_free_msgs(sctp_frag_msg *msg)
|
|
{
|
|
sctp_frag_be *beginend;
|
|
sctp_fragment *fragment;
|
|
|
|
/* free all begins */
|
|
while (msg->begins) {
|
|
beginend = msg->begins;
|
|
msg->begins = msg->begins->next;
|
|
g_free(beginend);
|
|
}
|
|
|
|
/* free all ends */
|
|
while (msg->ends) {
|
|
beginend = msg->ends;
|
|
msg->ends = msg->ends->next;
|
|
g_free(beginend);
|
|
}
|
|
|
|
/* free all fragments */
|
|
while (msg->fragments) {
|
|
fragment = msg->fragments;
|
|
msg->fragments = msg->fragments->next;
|
|
g_free(fragment->data);
|
|
g_free(fragment);
|
|
}
|
|
|
|
/* msg->messages is se_ allocated, no need to free it */
|
|
|
|
g_free(msg);
|
|
}
|
|
|
|
static gboolean
|
|
free_table_entry(gpointer key, gpointer value, gpointer user_data _U_)
|
|
{
|
|
sctp_frag_msg *msg = value;
|
|
frag_key *fkey = key;
|
|
|
|
frag_free_msgs(msg);
|
|
g_free(fkey);
|
|
return TRUE;
|
|
}
|
|
|
|
static void
|
|
frag_table_init(void)
|
|
{
|
|
/* destroy an existing hash table and create a new one */
|
|
if (frag_table) {
|
|
g_hash_table_foreach_remove(frag_table, free_table_entry, NULL);
|
|
g_hash_table_destroy(frag_table);
|
|
frag_table=NULL;
|
|
}
|
|
|
|
frag_table = g_hash_table_new(frag_hash, frag_equal);
|
|
}
|
|
|
|
|
|
static sctp_frag_msg*
|
|
find_message(guint16 stream_id, guint16 stream_seq_num)
|
|
{
|
|
frag_key key;
|
|
|
|
key.sport = sctp_info.sport;
|
|
key.dport = sctp_info.dport;
|
|
key.verification_tag = sctp_info.verification_tag;
|
|
key.stream_id = stream_id;
|
|
key.stream_seq_num = stream_seq_num;
|
|
|
|
return g_hash_table_lookup(frag_table, &key);
|
|
}
|
|
|
|
|
|
static sctp_fragment*
|
|
find_fragment(guint32 tsn, guint16 stream_id, guint16 stream_seq_num)
|
|
{
|
|
sctp_frag_msg *msg;
|
|
sctp_fragment *next_fragment;
|
|
|
|
msg = find_message(stream_id, stream_seq_num);
|
|
|
|
if (msg) {
|
|
next_fragment = msg->fragments;
|
|
while (next_fragment) {
|
|
if (next_fragment->tsn == tsn)
|
|
return next_fragment;
|
|
next_fragment = next_fragment->next;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static sctp_fragment*
|
|
add_fragment(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint32 tsn,
|
|
guint16 stream_id, guint16 stream_seq_num, guint8 b_bit, guint8 e_bit)
|
|
{
|
|
sctp_frag_msg *msg;
|
|
sctp_fragment *fragment, *last_fragment;
|
|
sctp_frag_be *beginend, *last_beginend;
|
|
frag_key *key;
|
|
|
|
/* lookup message. if not found, create it */
|
|
msg = find_message(stream_id, stream_seq_num);
|
|
|
|
if (!msg) {
|
|
msg = g_malloc (sizeof (sctp_frag_msg));
|
|
msg->begins = NULL;
|
|
msg->ends = NULL;
|
|
msg->fragments = NULL;
|
|
msg->messages = NULL;
|
|
msg->next = NULL;
|
|
|
|
key = g_malloc(sizeof (frag_key));
|
|
key->sport = sctp_info.sport;
|
|
key->dport = sctp_info.dport;
|
|
key->verification_tag = sctp_info.verification_tag;
|
|
key->stream_id = stream_id;
|
|
key->stream_seq_num = stream_seq_num;
|
|
|
|
g_hash_table_insert(frag_table, key, msg);
|
|
}
|
|
|
|
/* lookup segment. if not found, create it */
|
|
fragment = find_fragment(tsn, stream_id, stream_seq_num);
|
|
|
|
if (fragment) {
|
|
/* this fragment is already known.
|
|
* compare frame number to check if it's a duplicate
|
|
*/
|
|
if (fragment->frame_num == pinfo->fd->num) {
|
|
return fragment;
|
|
} else {
|
|
/* there already is a fragment having the same ports, v_tag,
|
|
* stream id, stream_seq_num and tsn but it appeared in a different
|
|
* frame, so it must be a duplicate fragment. maybe a retransmission?
|
|
* Mark it as duplicate and return NULL
|
|
*/
|
|
col_append_str(pinfo->cinfo, COL_INFO, " (Duplicate Message Fragment)");
|
|
|
|
proto_tree_add_uint(tree, hf_sctp_duplicate, tvb, 0, 0, fragment->frame_num);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/* create new fragment */
|
|
fragment = g_malloc (sizeof (sctp_fragment));
|
|
fragment->frame_num = pinfo->fd->num;
|
|
fragment->tsn = tsn;
|
|
fragment->len = tvb_length(tvb);
|
|
fragment->next = NULL;
|
|
if (fragment->len) {
|
|
fragment->data = g_malloc (fragment->len);
|
|
tvb_memcpy(tvb, fragment->data, 0, fragment->len);
|
|
}
|
|
|
|
/* add new fragment to linked list. sort ascending by tsn */
|
|
if (!msg->fragments)
|
|
msg->fragments = fragment;
|
|
else {
|
|
if (msg->fragments->tsn > fragment->tsn) {
|
|
fragment->next = msg->fragments;
|
|
msg->fragments = fragment;
|
|
} else {
|
|
last_fragment = msg->fragments;
|
|
while (last_fragment->next &&
|
|
last_fragment->next->tsn < fragment->tsn)
|
|
last_fragment = last_fragment->next;
|
|
|
|
fragment->next = last_fragment->next;
|
|
last_fragment->next = fragment;
|
|
}
|
|
}
|
|
|
|
|
|
/* save begin or end if neccessary */
|
|
if (b_bit && !e_bit) {
|
|
beginend = g_malloc (sizeof (sctp_frag_be));
|
|
beginend->fragment = fragment;
|
|
beginend->next = NULL;
|
|
|
|
/* add begin to linked list. sort descending by tsn */
|
|
if (!msg->begins)
|
|
msg->begins = beginend;
|
|
else {
|
|
if (msg->begins->fragment->tsn < beginend->fragment->tsn) {
|
|
beginend->next = msg->begins;
|
|
msg->begins = beginend;
|
|
} else {
|
|
last_beginend = msg->begins;
|
|
while (last_beginend->next &&
|
|
last_beginend->next->fragment->tsn > beginend->fragment->tsn)
|
|
last_beginend = last_beginend->next;
|
|
|
|
beginend->next = last_beginend->next;
|
|
last_beginend->next = beginend;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
if (!b_bit && e_bit) {
|
|
beginend = g_malloc (sizeof (sctp_frag_be));
|
|
beginend->fragment = fragment;
|
|
beginend->next = NULL;
|
|
|
|
/* add end to linked list. sort ascending by tsn */
|
|
if (!msg->ends)
|
|
msg->ends = beginend;
|
|
else {
|
|
if (msg->ends->fragment->tsn > beginend->fragment->tsn) {
|
|
beginend->next = msg->ends;
|
|
msg->ends = beginend;
|
|
} else {
|
|
last_beginend = msg->ends;
|
|
while (last_beginend->next &&
|
|
last_beginend->next->fragment->tsn < beginend->fragment->tsn)
|
|
last_beginend = last_beginend->next;
|
|
|
|
beginend->next = last_beginend->next;
|
|
last_beginend->next = beginend;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
return fragment;
|
|
}
|
|
|
|
static tvbuff_t*
|
|
fragment_reassembly(tvbuff_t *tvb, sctp_fragment* fragment,
|
|
packet_info *pinfo, proto_tree *tree, guint16 stream_id,
|
|
guint16 stream_seq_num)
|
|
{
|
|
sctp_frag_msg *msg;
|
|
sctp_complete_msg *message, *last_message;
|
|
sctp_fragment *frag_i, *last_frag, *first_frag;
|
|
sctp_frag_be *begin, *end, *beginend;
|
|
guint32 len, offset = 0;
|
|
tvbuff_t* new_tvb = NULL;
|
|
proto_item *item;
|
|
proto_tree *ptree;
|
|
|
|
msg = find_message(stream_id, stream_seq_num);
|
|
|
|
if (!msg) {
|
|
/* no message, we can't do anything */
|
|
return NULL;
|
|
}
|
|
|
|
/* check if fragment is part of an already reassembled message */
|
|
for (message = msg->messages;
|
|
message &&
|
|
!(message->begin <= fragment->tsn && message->end >= fragment->tsn) &&
|
|
!(message->begin > message->end &&
|
|
(message->begin <= fragment->tsn || message->end >= fragment->tsn));
|
|
message = message->next);
|
|
|
|
if (message) {
|
|
/* we found the reassembled message this fragment belongs to */
|
|
if (fragment == message->reassembled_in) {
|
|
|
|
/* this is the last fragment, create data source */
|
|
new_tvb = tvb_new_child_real_data(tvb, message->data, message->len, message->len);
|
|
add_new_data_source(pinfo, new_tvb, "Reassembled SCTP Message");
|
|
|
|
/* display reassembly info */
|
|
item = proto_tree_add_item(tree, hf_sctp_fragments, tvb, 0, -1, FALSE);
|
|
ptree = proto_item_add_subtree(item, ett_sctp_fragments);
|
|
proto_item_append_text(item, " (%u bytes, %u fragments): ",
|
|
message->len, message->end - message->begin + 1);
|
|
|
|
if (message->begin > message->end) {
|
|
for (frag_i = find_fragment(message->begin, stream_id, stream_seq_num);
|
|
frag_i;
|
|
frag_i = frag_i->next) {
|
|
|
|
proto_tree_add_uint_format(ptree, hf_sctp_fragment, new_tvb, offset, frag_i->len,
|
|
frag_i->frame_num, "Frame: %u, payload: %u-%u (%u bytes)",
|
|
frag_i->frame_num, offset, offset + frag_i->len - 1, frag_i->len);
|
|
offset += frag_i->len;
|
|
}
|
|
|
|
for (frag_i = msg->fragments;
|
|
frag_i && frag_i->tsn <= message->end;
|
|
frag_i = frag_i->next) {
|
|
|
|
proto_tree_add_uint_format(ptree, hf_sctp_fragment, new_tvb, offset, frag_i->len,
|
|
frag_i->frame_num, "Frame: %u, payload: %u-%u (%u bytes)",
|
|
frag_i->frame_num, offset, offset + frag_i->len - 1, frag_i->len);
|
|
offset += frag_i->len;
|
|
}
|
|
} else {
|
|
for (frag_i = find_fragment(message->begin, stream_id, stream_seq_num);
|
|
frag_i && frag_i->tsn <= message->end;
|
|
frag_i = frag_i->next) {
|
|
|
|
proto_tree_add_uint_format(ptree, hf_sctp_fragment, new_tvb, offset, frag_i->len,
|
|
frag_i->frame_num, "Frame: %u, payload: %u-%u (%u bytes)",
|
|
frag_i->frame_num, offset, offset + frag_i->len - 1, frag_i->len);
|
|
offset += frag_i->len;
|
|
}
|
|
}
|
|
|
|
return new_tvb;
|
|
}
|
|
|
|
/* this is not the last fragment,
|
|
* so let the user know the frame where the reassembly is
|
|
*/
|
|
col_append_str(pinfo->cinfo, COL_INFO, " (Message Fragment) ");
|
|
|
|
proto_tree_add_uint(tree, hf_sctp_reassembled_in, tvb, 0, 0, message->reassembled_in->frame_num);
|
|
return NULL;
|
|
}
|
|
|
|
/* this fragment has not been reassembled, yet
|
|
* check now if we can reassemble it
|
|
* at first look for the first and last tsn of the msg
|
|
*/
|
|
for (begin = msg->begins;
|
|
begin && begin->fragment->tsn > fragment->tsn;
|
|
begin = begin->next);
|
|
|
|
/* in case begin still is null, set it to first (highest) begin
|
|
* maybe the message tsn restart at 0 in between
|
|
*/
|
|
if (!begin)
|
|
begin = msg->begins;
|
|
|
|
for (end = msg->ends;
|
|
end && end->fragment->tsn < fragment->tsn;
|
|
end = end->next);
|
|
|
|
/* in case end still is null, set it to first (lowest) end
|
|
* maybe the message tsn restart at 0 in between
|
|
*/
|
|
if (!end)
|
|
end = msg->ends;
|
|
|
|
if (!begin || !end || !msg->fragments ||
|
|
(begin->fragment->tsn > end->fragment->tsn && msg->fragments->tsn)) {
|
|
/* begin and end have not been collected, yet
|
|
* or there might be a tsn restart but the first fragment hasn't a tsn of 0
|
|
* just mark as fragment
|
|
*/
|
|
|
|
col_append_str(pinfo->cinfo, COL_INFO, " (Message Fragment) ");
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* we found possible begin and end
|
|
* look for the first fragment and then try to get to the end
|
|
*/
|
|
first_frag = begin->fragment;
|
|
|
|
/* while looking if all fragments are there
|
|
* we can calculate the overall length that
|
|
* we need in case of success
|
|
*/
|
|
len = first_frag->len;
|
|
|
|
/* check if begin is past end
|
|
* this can happen if there has been a tsn restart
|
|
* or we just got the wrong begin and end
|
|
* so give it a try
|
|
*/
|
|
if (begin->fragment->tsn > end->fragment->tsn) {
|
|
for (last_frag = first_frag, frag_i = first_frag->next;
|
|
frag_i && frag_i->tsn == (last_frag->tsn + 1);
|
|
last_frag = frag_i, frag_i = frag_i->next) len += frag_i->len;
|
|
|
|
/* check if we reached the last possible tsn
|
|
* if yes, restart and continue
|
|
*/
|
|
if ((last_frag->tsn + 1)) {
|
|
/* there are just fragments missing */
|
|
col_append_str(pinfo->cinfo, COL_INFO, " (Message Fragment) ");
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* we got all fragments until the last possible tsn
|
|
* and the first is 0 if we got here
|
|
*/
|
|
|
|
len += msg->fragments->len;
|
|
for (last_frag = msg->fragments, frag_i = last_frag->next;
|
|
frag_i && frag_i->tsn < end->fragment->tsn && frag_i->tsn == (last_frag->tsn + 1);
|
|
last_frag = frag_i, frag_i = frag_i->next) len += frag_i->len;
|
|
|
|
} else {
|
|
for (last_frag = first_frag, frag_i = first_frag->next;
|
|
frag_i && frag_i->tsn < end->fragment->tsn && frag_i->tsn == (last_frag->tsn + 1);
|
|
last_frag = frag_i, frag_i = frag_i->next) len += frag_i->len;
|
|
}
|
|
|
|
if (!frag_i || frag_i != end->fragment || frag_i->tsn != (last_frag->tsn + 1)) {
|
|
/* we need more fragments. just mark as fragment */
|
|
col_append_str(pinfo->cinfo, COL_INFO, " (Message Fragment) ");
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* ok, this message is complete, we can reassemble it
|
|
* but at first don't forget to add the length of the last fragment
|
|
*/
|
|
len += frag_i->len;
|
|
|
|
message = se_alloc (sizeof (sctp_complete_msg));
|
|
message->begin = begin->fragment->tsn;
|
|
message->end = end->fragment->tsn;
|
|
message->reassembled_in = fragment;
|
|
message->len = len;
|
|
message->data = se_alloc(len);
|
|
message->next = NULL;
|
|
|
|
/* now copy all fragments */
|
|
if (begin->fragment->tsn > end->fragment->tsn) {
|
|
/* a tsn restart has occured */
|
|
for (frag_i = first_frag;
|
|
frag_i;
|
|
frag_i = frag_i->next) {
|
|
|
|
if (frag_i->len && frag_i->data)
|
|
memcpy(message->data + offset, frag_i->data, frag_i->len);
|
|
offset += frag_i->len;
|
|
|
|
/* release fragment data */
|
|
g_free(frag_i->data);
|
|
frag_i->data = NULL;
|
|
}
|
|
|
|
for (frag_i = msg->fragments;
|
|
frag_i && frag_i->tsn <= end->fragment->tsn;
|
|
frag_i = frag_i->next) {
|
|
|
|
if (frag_i->len && frag_i->data)
|
|
memcpy(message->data + offset, frag_i->data, frag_i->len);
|
|
offset += frag_i->len;
|
|
|
|
/* release fragment data */
|
|
g_free(frag_i->data);
|
|
frag_i->data = NULL;
|
|
}
|
|
|
|
} else {
|
|
for (frag_i = first_frag;
|
|
frag_i && frag_i->tsn <= end->fragment->tsn;
|
|
frag_i = frag_i->next) {
|
|
|
|
if (frag_i->len && frag_i->data)
|
|
memcpy(message->data + offset, frag_i->data, frag_i->len);
|
|
offset += frag_i->len;
|
|
|
|
/* release fragment data */
|
|
g_free(frag_i->data);
|
|
frag_i->data = NULL;
|
|
}
|
|
}
|
|
|
|
/* save message */
|
|
if (!msg->messages) {
|
|
msg->messages = message;
|
|
} else {
|
|
for (last_message = msg->messages;
|
|
last_message->next;
|
|
last_message = last_message->next);
|
|
|
|
last_message->next = message;
|
|
}
|
|
|
|
/* remove begin and end from list */
|
|
if (msg->begins == begin) {
|
|
msg->begins = begin->next;
|
|
} else {
|
|
for (beginend = msg->begins;
|
|
beginend && beginend->next != begin;
|
|
beginend = beginend->next);
|
|
if (beginend && beginend->next == begin)
|
|
beginend->next = begin->next;
|
|
}
|
|
g_free(begin);
|
|
|
|
if (msg->ends == end) {
|
|
msg->ends = end->next;
|
|
} else {
|
|
for (beginend = msg->ends;
|
|
beginend && beginend->next != end;
|
|
beginend = beginend->next);
|
|
if (beginend && beginend->next == end)
|
|
beginend->next = end->next;
|
|
}
|
|
g_free(end);
|
|
|
|
/* create data source */
|
|
new_tvb = tvb_new_child_real_data(tvb, message->data, len, len);
|
|
add_new_data_source(pinfo, new_tvb, "Reassembled SCTP Message");
|
|
|
|
/* display reassembly info */
|
|
item = proto_tree_add_item(tree, hf_sctp_fragments, tvb, 0, -1, FALSE);
|
|
ptree = proto_item_add_subtree(item, ett_sctp_fragments);
|
|
proto_item_append_text(item, " (%u bytes, %u fragments): ",
|
|
message->len, message->end - message->begin + 1);
|
|
|
|
if (message->begin > message->end) {
|
|
for (frag_i = find_fragment(message->begin, stream_id, stream_seq_num);
|
|
frag_i;
|
|
frag_i = frag_i->next) {
|
|
|
|
proto_tree_add_uint_format(ptree, hf_sctp_fragment, new_tvb, offset, frag_i->len,
|
|
frag_i->frame_num, "Frame: %u, payload: %u-%u (%u bytes)",
|
|
frag_i->frame_num, offset, offset + frag_i->len - 1, frag_i->len);
|
|
offset += frag_i->len;
|
|
}
|
|
|
|
for (frag_i = msg->fragments;
|
|
frag_i && frag_i->tsn <= message->end;
|
|
frag_i = frag_i->next) {
|
|
|
|
proto_tree_add_uint_format(ptree, hf_sctp_fragment, new_tvb, offset, frag_i->len,
|
|
frag_i->frame_num, "Frame: %u, payload: %u-%u (%u bytes)",
|
|
frag_i->frame_num, offset, offset + frag_i->len - 1, frag_i->len);
|
|
offset += frag_i->len;
|
|
}
|
|
} else {
|
|
for (frag_i = find_fragment(message->begin, stream_id, stream_seq_num);
|
|
frag_i && frag_i->tsn <= message->end;
|
|
frag_i = frag_i->next) {
|
|
|
|
proto_tree_add_uint_format(ptree, hf_sctp_fragment, new_tvb, offset, frag_i->len,
|
|
frag_i->frame_num, "Frame: %u, payload: %u-%u (%u bytes)",
|
|
frag_i->frame_num, offset, offset + frag_i->len - 1, frag_i->len);
|
|
offset += frag_i->len;
|
|
}
|
|
}
|
|
|
|
/* it's not fragmented anymore */
|
|
pinfo->fragmented = FALSE;
|
|
|
|
return new_tvb;
|
|
}
|
|
|
|
|
|
static gboolean
|
|
dissect_fragmented_payload(tvbuff_t *payload_tvb, packet_info *pinfo, proto_tree *tree,
|
|
proto_tree *chunk_tree, guint32 tsn, guint32 ppi, guint16 stream_id,
|
|
guint16 stream_seq_num, guint8 b_bit, guint8 e_bit)
|
|
{
|
|
sctp_fragment* fragment;
|
|
tvbuff_t* new_tvb = NULL;
|
|
|
|
/* add fragement to list of known fragments. returns NULL if segment is a duplicate */
|
|
fragment = add_fragment(payload_tvb, pinfo, chunk_tree, tsn, stream_id, stream_seq_num, b_bit, e_bit);
|
|
|
|
if (fragment)
|
|
new_tvb = fragment_reassembly(payload_tvb, fragment, pinfo, chunk_tree, stream_id, stream_seq_num);
|
|
|
|
/* pass reassembled data to next dissector, if possible */
|
|
if (new_tvb)
|
|
return dissect_payload(new_tvb, pinfo, tree, ppi);
|
|
|
|
/* no reassembly done, do nothing */
|
|
return TRUE;
|
|
}
|
|
|
|
static const true_false_string sctp_data_chunk_e_bit_value = {
|
|
"Last segment",
|
|
"Not the last segment"
|
|
};
|
|
|
|
static const true_false_string sctp_data_chunk_b_bit_value = {
|
|
"First segment",
|
|
"Subsequent segment"
|
|
};
|
|
|
|
static const true_false_string sctp_data_chunk_u_bit_value = {
|
|
"Unordered delivery",
|
|
"Ordered delivery"
|
|
};
|
|
|
|
static const true_false_string sctp_data_chunk_i_bit_value = {
|
|
"Send SACK immediately",
|
|
"Possibly delay SACK"
|
|
};
|
|
|
|
static gboolean
|
|
dissect_data_chunk(tvbuff_t *chunk_tvb,
|
|
guint16 chunk_length,
|
|
packet_info *pinfo,
|
|
proto_tree *tree,
|
|
proto_tree *chunk_tree,
|
|
proto_item *chunk_item,
|
|
proto_item *flags_item,
|
|
sctp_half_assoc_t* ha)
|
|
{
|
|
guint number_of_ppid;
|
|
guint32 payload_proto_id;
|
|
tvbuff_t *payload_tvb;
|
|
proto_tree *flags_tree;
|
|
guint8 e_bit, b_bit, u_bit;
|
|
guint16 stream_id, stream_seq_num = 0;
|
|
guint32 tsn;
|
|
proto_item* tsn_item = NULL;
|
|
|
|
if (chunk_length <= DATA_CHUNK_HEADER_LENGTH) {
|
|
proto_item_append_text(chunk_item, ", bogus chunk length %u < %u)",
|
|
chunk_length, DATA_CHUNK_HEADER_LENGTH);
|
|
return TRUE;
|
|
}
|
|
payload_proto_id = tvb_get_ntohl(chunk_tvb, DATA_CHUNK_PAYLOAD_PROTOCOL_ID_OFFSET);
|
|
|
|
/* insert the PPID in the pinfo structure if it is non-zero, not already there and there is still room */
|
|
if (payload_proto_id) {
|
|
for(number_of_ppid = 0; number_of_ppid < MAX_NUMBER_OF_PPIDS; number_of_ppid++)
|
|
if ((pinfo->ppids[number_of_ppid] == 0) || (pinfo->ppids[number_of_ppid] == payload_proto_id))
|
|
break;
|
|
if ((number_of_ppid < MAX_NUMBER_OF_PPIDS) && (pinfo->ppids[number_of_ppid] == 0))
|
|
pinfo->ppids[number_of_ppid] = payload_proto_id;
|
|
}
|
|
|
|
e_bit = tvb_get_guint8(chunk_tvb, CHUNK_FLAGS_OFFSET) & SCTP_DATA_CHUNK_E_BIT;
|
|
b_bit = tvb_get_guint8(chunk_tvb, CHUNK_FLAGS_OFFSET) & SCTP_DATA_CHUNK_B_BIT;
|
|
u_bit = tvb_get_guint8(chunk_tvb, CHUNK_FLAGS_OFFSET) & SCTP_DATA_CHUNK_U_BIT;
|
|
stream_id = tvb_get_ntohs(chunk_tvb, DATA_CHUNK_STREAM_ID_OFFSET);
|
|
stream_seq_num = tvb_get_ntohs(chunk_tvb, DATA_CHUNK_STREAM_SEQ_NUMBER_OFFSET);
|
|
tsn = tvb_get_ntohl(chunk_tvb, DATA_CHUNK_TSN_OFFSET);
|
|
|
|
if (chunk_tree) {
|
|
proto_item_set_len(chunk_item, DATA_CHUNK_HEADER_LENGTH);
|
|
flags_tree = proto_item_add_subtree(flags_item, ett_sctp_data_chunk_flags);
|
|
proto_tree_add_item(flags_tree, hf_data_chunk_e_bit, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(flags_tree, hf_data_chunk_b_bit, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(flags_tree, hf_data_chunk_u_bit, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(flags_tree, hf_data_chunk_i_bit, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, REP_BIG_ENDIAN);
|
|
tsn_item = proto_tree_add_item(chunk_tree, hf_data_chunk_tsn, chunk_tvb, DATA_CHUNK_TSN_OFFSET, DATA_CHUNK_TSN_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_data_chunk_stream_id, chunk_tvb, DATA_CHUNK_STREAM_ID_OFFSET, DATA_CHUNK_STREAM_ID_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_data_chunk_stream_seq_number, chunk_tvb, DATA_CHUNK_STREAM_SEQ_NUMBER_OFFSET, DATA_CHUNK_STREAM_SEQ_NUMBER_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_data_chunk_payload_proto_id, chunk_tvb, DATA_CHUNK_PAYLOAD_PROTOCOL_ID_OFFSET, DATA_CHUNK_PAYLOAD_PROTOCOL_ID_LENGTH, REP_BIG_ENDIAN);
|
|
|
|
proto_item_append_text(chunk_item, "(%s, ", (u_bit) ? "unordered" : "ordered");
|
|
if (b_bit) {
|
|
if (e_bit)
|
|
proto_item_append_text(chunk_item, "complete");
|
|
else
|
|
proto_item_append_text(chunk_item, "first");
|
|
} else {
|
|
if (e_bit)
|
|
proto_item_append_text(chunk_item, "last");
|
|
else
|
|
proto_item_append_text(chunk_item, "middle");
|
|
}
|
|
|
|
proto_item_append_text(chunk_item, " segment, TSN: %u, SID: %u, SSN: %u, PPID: %u, payload length: %u byte%s)",
|
|
tvb_get_ntohl(chunk_tvb, DATA_CHUNK_TSN_OFFSET),
|
|
tvb_get_ntohs(chunk_tvb, DATA_CHUNK_STREAM_ID_OFFSET),
|
|
tvb_get_ntohs(chunk_tvb, DATA_CHUNK_STREAM_SEQ_NUMBER_OFFSET),
|
|
payload_proto_id,
|
|
chunk_length - DATA_CHUNK_HEADER_LENGTH, plurality(chunk_length - DATA_CHUNK_HEADER_LENGTH, "", "s"));
|
|
}
|
|
|
|
sctp_tsn(pinfo, chunk_tvb, tsn_item, ha, tsn);
|
|
|
|
|
|
payload_tvb = tvb_new_subset(chunk_tvb, DATA_CHUNK_PAYLOAD_OFFSET, chunk_length - DATA_CHUNK_HEADER_LENGTH, chunk_length - DATA_CHUNK_HEADER_LENGTH);
|
|
|
|
/* Is this a fragment? */
|
|
if (b_bit && e_bit) {
|
|
/* No - just call the subdissector. */
|
|
return dissect_payload(payload_tvb, pinfo, tree, payload_proto_id);
|
|
} else {
|
|
/* Yes. */
|
|
pinfo->fragmented = TRUE;
|
|
|
|
/* if reassembly is off just mark as fragment for next dissector and proceed */
|
|
if (!use_reassembly)
|
|
{
|
|
/* Don't pass on non-first fragments since the next dissector will
|
|
* almost certainly not understand the data.
|
|
*/
|
|
if (b_bit)
|
|
{
|
|
volatile gboolean retval = FALSE;
|
|
|
|
/*
|
|
* If this particular fragment happens to get a ReportedBoundsError
|
|
* exception (which in fact we expect it to since it's a fragment),
|
|
* don't stop dissecting chunks within this frame.
|
|
*
|
|
* If it gets a BoundsError, we can stop, as there's nothing more to
|
|
* see, so we just re-throw it.
|
|
*/
|
|
TRY {
|
|
retval = dissect_payload(payload_tvb, pinfo, tree, payload_proto_id);
|
|
}
|
|
CATCH(BoundsError) {
|
|
RETHROW;
|
|
}
|
|
CATCH(ReportedBoundsError) {
|
|
show_reported_bounds_error(payload_tvb, pinfo, tree);
|
|
}
|
|
ENDTRY;
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* else */
|
|
return FALSE;
|
|
}
|
|
|
|
/* if unordered set stream_seq_num to 0 for easier handling */
|
|
if (u_bit)
|
|
stream_seq_num = 0;
|
|
|
|
/* start reassembly */
|
|
return dissect_fragmented_payload(payload_tvb, pinfo, tree, chunk_tree, tsn, payload_proto_id, stream_id, stream_seq_num, b_bit, e_bit);
|
|
}
|
|
}
|
|
|
|
#define INIT_CHUNK_INITIATE_TAG_LENGTH 4
|
|
#define INIT_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH 4
|
|
#define INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_LENGTH 2
|
|
#define INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_LENGTH 2
|
|
#define INIT_CHUNK_INITIAL_TSN_LENGTH 4
|
|
#define INIT_CHUNK_FIXED_PARAMTERS_LENGTH (CHUNK_HEADER_LENGTH + \
|
|
INIT_CHUNK_INITIATE_TAG_LENGTH + \
|
|
INIT_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH + \
|
|
INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_LENGTH + \
|
|
INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_LENGTH + \
|
|
INIT_CHUNK_INITIAL_TSN_LENGTH)
|
|
|
|
#define INIT_CHUNK_INITIATE_TAG_OFFSET CHUNK_VALUE_OFFSET
|
|
#define INIT_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET (INIT_CHUNK_INITIATE_TAG_OFFSET + \
|
|
INIT_CHUNK_INITIATE_TAG_LENGTH )
|
|
#define INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_OFFSET (INIT_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET + \
|
|
INIT_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH )
|
|
#define INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_OFFSET (INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_OFFSET + \
|
|
INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_LENGTH )
|
|
#define INIT_CHUNK_INITIAL_TSN_OFFSET (INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_OFFSET + \
|
|
INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_LENGTH )
|
|
#define INIT_CHUNK_VARIABLE_LENGTH_PARAMETER_OFFSET (INIT_CHUNK_INITIAL_TSN_OFFSET + \
|
|
INIT_CHUNK_INITIAL_TSN_LENGTH )
|
|
|
|
static void
|
|
dissect_init_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, packet_info *pinfo, proto_tree *chunk_tree, proto_item *chunk_item)
|
|
{
|
|
tvbuff_t *parameters_tvb;
|
|
proto_item *hidden_item;
|
|
|
|
if (chunk_length < INIT_CHUNK_FIXED_PARAMTERS_LENGTH) {
|
|
proto_item_append_text(chunk_item, ", bogus chunk length %u < %u)",
|
|
chunk_length,
|
|
INIT_CHUNK_FIXED_PARAMTERS_LENGTH);
|
|
return;
|
|
}
|
|
if (chunk_tree) {
|
|
/* handle fixed parameters */
|
|
proto_tree_add_item(chunk_tree, hf_init_chunk_initiate_tag, chunk_tvb, INIT_CHUNK_INITIATE_TAG_OFFSET, INIT_CHUNK_INITIATE_TAG_LENGTH, REP_BIG_ENDIAN);
|
|
hidden_item = proto_tree_add_item(chunk_tree, hf_initiate_tag, chunk_tvb, INIT_CHUNK_INITIATE_TAG_OFFSET, INIT_CHUNK_INITIATE_TAG_LENGTH, REP_BIG_ENDIAN);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
proto_tree_add_item(chunk_tree, hf_init_chunk_adv_rec_window_credit, chunk_tvb, INIT_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET, INIT_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_init_chunk_number_of_outbound_streams, chunk_tvb, INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_OFFSET, INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_init_chunk_number_of_inbound_streams, chunk_tvb, INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_OFFSET, INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_init_chunk_initial_tsn, chunk_tvb, INIT_CHUNK_INITIAL_TSN_OFFSET, INIT_CHUNK_INITIAL_TSN_LENGTH, REP_BIG_ENDIAN);
|
|
|
|
proto_item_append_text(chunk_item, " (Outbound streams: %u, inbound streams: %u)",
|
|
tvb_get_ntohs(chunk_tvb, INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_OFFSET),
|
|
tvb_get_ntohs(chunk_tvb, INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_OFFSET));
|
|
}
|
|
/* handle variable parameters */
|
|
chunk_length -= INIT_CHUNK_FIXED_PARAMTERS_LENGTH;
|
|
parameters_tvb = tvb_new_subset(chunk_tvb, INIT_CHUNK_VARIABLE_LENGTH_PARAMETER_OFFSET, chunk_length, chunk_length);
|
|
dissect_parameters(parameters_tvb, pinfo, chunk_tree, NULL, TRUE);
|
|
}
|
|
|
|
static void
|
|
dissect_init_ack_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, packet_info *pinfo, proto_tree *chunk_tree, proto_item *chunk_item)
|
|
{
|
|
tvbuff_t *parameters_tvb;
|
|
proto_item *hidden_item;
|
|
|
|
if (chunk_length < INIT_CHUNK_FIXED_PARAMTERS_LENGTH) {
|
|
proto_item_append_text(chunk_item, ", bogus chunk length %u < %u)",
|
|
chunk_length,
|
|
INIT_CHUNK_FIXED_PARAMTERS_LENGTH);
|
|
return;
|
|
}
|
|
if (chunk_tree) {
|
|
/* handle fixed parameters */
|
|
proto_tree_add_item(chunk_tree, hf_initack_chunk_initiate_tag, chunk_tvb, INIT_CHUNK_INITIATE_TAG_OFFSET, INIT_CHUNK_INITIATE_TAG_LENGTH, REP_BIG_ENDIAN);
|
|
hidden_item = proto_tree_add_item(chunk_tree, hf_initiate_tag, chunk_tvb, INIT_CHUNK_INITIATE_TAG_OFFSET, INIT_CHUNK_INITIATE_TAG_LENGTH, REP_BIG_ENDIAN);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
proto_tree_add_item(chunk_tree, hf_initack_chunk_adv_rec_window_credit, chunk_tvb, INIT_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET, INIT_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_initack_chunk_number_of_outbound_streams, chunk_tvb, INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_OFFSET, INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_initack_chunk_number_of_inbound_streams, chunk_tvb, INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_OFFSET, INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_initack_chunk_initial_tsn, chunk_tvb, INIT_CHUNK_INITIAL_TSN_OFFSET, INIT_CHUNK_INITIAL_TSN_LENGTH, REP_BIG_ENDIAN);
|
|
|
|
proto_item_append_text(chunk_item, " (Outbound streams: %u, inbound streams: %u)",
|
|
tvb_get_ntohs(chunk_tvb, INIT_CHUNK_NUMBER_OF_OUTBOUND_STREAMS_OFFSET),
|
|
tvb_get_ntohs(chunk_tvb, INIT_CHUNK_NUMBER_OF_INBOUND_STREAMS_OFFSET));
|
|
}
|
|
/* handle variable paramters */
|
|
chunk_length -= INIT_CHUNK_FIXED_PARAMTERS_LENGTH;
|
|
parameters_tvb = tvb_new_subset(chunk_tvb, INIT_CHUNK_VARIABLE_LENGTH_PARAMETER_OFFSET, chunk_length, chunk_length);
|
|
dissect_parameters(parameters_tvb, pinfo, chunk_tree, NULL, TRUE);
|
|
}
|
|
|
|
#define SCTP_SACK_CHUNK_NS_BIT 0x01
|
|
#define SACK_CHUNK_CUMULATIVE_TSN_ACK_LENGTH 4
|
|
#define SACK_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH 4
|
|
#define SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_LENGTH 2
|
|
#define SACK_CHUNK_NUMBER_OF_DUP_TSNS_LENGTH 2
|
|
#define SACK_CHUNK_GAP_BLOCK_LENGTH 4
|
|
#define SACK_CHUNK_GAP_BLOCK_START_LENGTH 2
|
|
#define SACK_CHUNK_GAP_BLOCK_END_LENGTH 2
|
|
#define SACK_CHUNK_DUP_TSN_LENGTH 4
|
|
|
|
#define SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET (CHUNK_VALUE_OFFSET + 0)
|
|
#define SACK_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET (SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET + \
|
|
SACK_CHUNK_CUMULATIVE_TSN_ACK_LENGTH)
|
|
#define SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_OFFSET (SACK_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET + \
|
|
SACK_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH)
|
|
#define SACK_CHUNK_NUMBER_OF_DUP_TSNS_OFFSET (SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_OFFSET + \
|
|
SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_LENGTH)
|
|
#define SACK_CHUNK_GAP_BLOCK_OFFSET (SACK_CHUNK_NUMBER_OF_DUP_TSNS_OFFSET + \
|
|
SACK_CHUNK_NUMBER_OF_DUP_TSNS_LENGTH)
|
|
|
|
|
|
static void
|
|
dissect_sack_chunk(packet_info* pinfo, tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item, sctp_half_assoc_t* ha)
|
|
{
|
|
guint16 number_of_gap_blocks, number_of_dup_tsns;
|
|
guint16 gap_block_number, dup_tsn_number, start, end;
|
|
gint gap_block_offset, dup_tsn_offset;
|
|
guint32 cum_tsn_ack;
|
|
proto_item *block_item;
|
|
proto_tree *block_tree;
|
|
proto_tree *flags_tree;
|
|
proto_item *ctsa_item;
|
|
proto_item *a_rwnd_item;
|
|
proto_tree *acks_tree;
|
|
guint32 tsns_gap_acked = 0;
|
|
guint32 a_rwnd;
|
|
|
|
flags_tree = proto_item_add_subtree(flags_item, ett_sctp_sack_chunk_flags);
|
|
proto_tree_add_item(flags_tree, hf_sack_chunk_ns, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, REP_BIG_ENDIAN);
|
|
ctsa_item = proto_tree_add_item(chunk_tree, hf_sack_chunk_cumulative_tsn_ack, chunk_tvb, SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET, SACK_CHUNK_CUMULATIVE_TSN_ACK_LENGTH, REP_BIG_ENDIAN);
|
|
a_rwnd_item = proto_tree_add_item(chunk_tree, hf_sack_chunk_adv_rec_window_credit, chunk_tvb, SACK_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET, SACK_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_sack_chunk_number_of_gap_blocks, chunk_tvb, SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_OFFSET, SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_sack_chunk_number_of_dup_tsns, chunk_tvb, SACK_CHUNK_NUMBER_OF_DUP_TSNS_OFFSET, SACK_CHUNK_NUMBER_OF_DUP_TSNS_LENGTH, REP_BIG_ENDIAN);
|
|
|
|
a_rwnd = tvb_get_ntohl(chunk_tvb, SACK_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET);
|
|
if (a_rwnd == 0)
|
|
expert_add_info_format(pinfo, a_rwnd_item, PI_SEQUENCE, PI_NOTE, "Zero Advertised Receiver Window Credit");
|
|
|
|
|
|
/* handle the gap acknowledgement blocks */
|
|
number_of_gap_blocks = tvb_get_ntohs(chunk_tvb, SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_OFFSET);
|
|
gap_block_offset = SACK_CHUNK_GAP_BLOCK_OFFSET;
|
|
cum_tsn_ack = tvb_get_ntohl(chunk_tvb, SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET);
|
|
|
|
acks_tree = proto_item_add_subtree(ctsa_item,ett_sctp_ack);
|
|
sctp_ack_block(pinfo, ha, chunk_tvb, acks_tree, NULL, cum_tsn_ack);
|
|
|
|
for(gap_block_number = 1; gap_block_number <= number_of_gap_blocks; gap_block_number++) {
|
|
proto_item *pi;
|
|
proto_tree *pt;
|
|
guint32 tsn_start;
|
|
|
|
start = tvb_get_ntohs(chunk_tvb, gap_block_offset);
|
|
end = tvb_get_ntohs(chunk_tvb, gap_block_offset + SACK_CHUNK_GAP_BLOCK_START_LENGTH);
|
|
tsn_start = cum_tsn_ack + start;
|
|
|
|
block_item = proto_tree_add_text(chunk_tree, chunk_tvb, gap_block_offset, SACK_CHUNK_GAP_BLOCK_LENGTH, "Gap Acknowledgement for TSN %u to %u", cum_tsn_ack + start, cum_tsn_ack + end);
|
|
block_tree = proto_item_add_subtree(block_item, ett_sctp_sack_chunk_gap_block);
|
|
|
|
pi = proto_tree_add_item(block_tree, hf_sack_chunk_gap_block_start, chunk_tvb, gap_block_offset, SACK_CHUNK_GAP_BLOCK_START_LENGTH, REP_BIG_ENDIAN);
|
|
pt = proto_item_add_subtree(pi, ett_sctp_sack_chunk_gap_block_start);
|
|
pi = proto_tree_add_uint(pt, hf_sack_chunk_gap_block_start_tsn,
|
|
chunk_tvb, gap_block_offset,SACK_CHUNK_GAP_BLOCK_START_LENGTH, cum_tsn_ack + start);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
pi = proto_tree_add_item(block_tree, hf_sack_chunk_gap_block_end, chunk_tvb, gap_block_offset + SACK_CHUNK_GAP_BLOCK_START_LENGTH, SACK_CHUNK_GAP_BLOCK_END_LENGTH, REP_BIG_ENDIAN);
|
|
pt = proto_item_add_subtree(pi, ett_sctp_sack_chunk_gap_block_end);
|
|
pi = proto_tree_add_uint(pt, hf_sack_chunk_gap_block_end_tsn, chunk_tvb,
|
|
gap_block_offset + SACK_CHUNK_GAP_BLOCK_START_LENGTH, SACK_CHUNK_GAP_BLOCK_END_LENGTH, cum_tsn_ack + end);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
sctp_ack_block(pinfo, ha, chunk_tvb, block_tree, &tsn_start, cum_tsn_ack + end);
|
|
gap_block_offset += SACK_CHUNK_GAP_BLOCK_LENGTH;
|
|
|
|
tsns_gap_acked += (end+1 - start);
|
|
}
|
|
|
|
if (tsns_gap_acked) {
|
|
proto_item *pi;
|
|
|
|
pi = proto_tree_add_uint(chunk_tree, hf_sack_chunk_number_tsns_gap_acked, chunk_tvb, 0, 0, tsns_gap_acked);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
/* If there are a huge number of GAP ACKs, warn the user. 100 is a random
|
|
* number: it could be tuned.
|
|
*/
|
|
if (tsns_gap_acked > 100)
|
|
expert_add_info_format(pinfo, pi, PI_SEQUENCE, PI_WARN, "More than 100 TSNs were gap-acknowledged in this SACK");
|
|
|
|
}
|
|
|
|
|
|
/* handle the duplicate TSNs */
|
|
number_of_dup_tsns = tvb_get_ntohs(chunk_tvb, SACK_CHUNK_NUMBER_OF_DUP_TSNS_OFFSET);
|
|
dup_tsn_offset = SACK_CHUNK_GAP_BLOCK_OFFSET + number_of_gap_blocks * SACK_CHUNK_GAP_BLOCK_LENGTH;
|
|
for(dup_tsn_number = 1; dup_tsn_number <= number_of_dup_tsns; dup_tsn_number++) {
|
|
proto_tree_add_item(chunk_tree, hf_sack_chunk_duplicate_tsn, chunk_tvb, dup_tsn_offset, SACK_CHUNK_DUP_TSN_LENGTH, REP_BIG_ENDIAN);
|
|
dup_tsn_offset += SACK_CHUNK_DUP_TSN_LENGTH;
|
|
}
|
|
|
|
proto_item_append_text(chunk_item, " (Cumulative TSN: %u, a_rwnd: %u, gaps: %u, duplicate TSNs: %u)",
|
|
tvb_get_ntohl(chunk_tvb, SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET),
|
|
a_rwnd,
|
|
number_of_gap_blocks, number_of_dup_tsns);
|
|
}
|
|
|
|
/* NE: Dissect nr-sack chunk */
|
|
#define SCTP_NR_SACK_CHUNK_NS_BIT 0x01
|
|
#define NR_SACK_CHUNK_CUMULATIVE_TSN_ACK_LENGTH 4
|
|
#define NR_SACK_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH 4
|
|
#define NR_SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_LENGTH 2
|
|
#define NR_SACK_CHUNK_NUMBER_OF_NR_GAP_BLOCKS_LENGTH 2
|
|
#define NR_SACK_CHUNK_NUMBER_OF_DUP_TSNS_LENGTH 2
|
|
#define NR_SACK_CHUNK_RESERVED_LENGTH 2
|
|
#define NR_SACK_CHUNK_GAP_BLOCK_LENGTH 4
|
|
#define NR_SACK_CHUNK_GAP_BLOCK_START_LENGTH 2
|
|
#define NR_SACK_CHUNK_GAP_BLOCK_END_LENGTH 2
|
|
#define NR_SACK_CHUNK_NR_GAP_BLOCK_LENGTH 4
|
|
#define NR_SACK_CHUNK_NR_GAP_BLOCK_START_LENGTH 2
|
|
#define NR_SACK_CHUNK_NR_GAP_BLOCK_END_LENGTH 2
|
|
#define NR_SACK_CHUNK_DUP_TSN_LENGTH 4
|
|
|
|
#define NR_SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET (CHUNK_VALUE_OFFSET + 0)
|
|
#define NR_SACK_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET (NR_SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET + \
|
|
NR_SACK_CHUNK_CUMULATIVE_TSN_ACK_LENGTH)
|
|
#define NR_SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_OFFSET (NR_SACK_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET + \
|
|
NR_SACK_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH)
|
|
#define NR_SACK_CHUNK_NUMBER_OF_NR_GAP_BLOCKS_OFFSET (NR_SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_OFFSET + \
|
|
NR_SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_LENGTH)
|
|
#define NR_SACK_CHUNK_NUMBER_OF_DUP_TSNS_OFFSET (NR_SACK_CHUNK_NUMBER_OF_NR_GAP_BLOCKS_OFFSET + \
|
|
NR_SACK_CHUNK_NUMBER_OF_NR_GAP_BLOCKS_LENGTH)
|
|
#define NR_SACK_CHUNK_RESERVED_OFFSET (NR_SACK_CHUNK_NUMBER_OF_DUP_TSNS_OFFSET + \
|
|
NR_SACK_CHUNK_NUMBER_OF_DUP_TSNS_LENGTH)
|
|
#define NR_SACK_CHUNK_GAP_BLOCK_OFFSET (NR_SACK_CHUNK_RESERVED_OFFSET + \
|
|
NR_SACK_CHUNK_RESERVED_LENGTH)
|
|
|
|
static void
|
|
dissect_nr_sack_chunk(packet_info* pinfo, tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item, sctp_half_assoc_t* ha)
|
|
{
|
|
guint16 number_of_gap_blocks, number_of_dup_tsns;
|
|
guint16 number_of_nr_gap_blocks;
|
|
guint16 gap_block_number, nr_gap_block_number, dup_tsn_number, start, end;
|
|
gint gap_block_offset, nr_gap_block_offset, dup_tsn_offset;
|
|
guint32 cum_tsn_ack;
|
|
proto_item *block_item;
|
|
proto_tree *block_tree;
|
|
proto_tree *flags_tree;
|
|
proto_item *ctsa_item;
|
|
proto_item *num_of_gap_blocks;
|
|
proto_tree *acks_tree;
|
|
guint32 tsns_gap_acked = 0;
|
|
guint32 tsns_nr_gap_acked = 0;
|
|
|
|
flags_tree = proto_item_add_subtree(flags_item, ett_sctp_nr_sack_chunk_flags);
|
|
proto_tree_add_item(flags_tree, hf_nr_sack_chunk_ns, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, REP_BIG_ENDIAN);
|
|
|
|
ctsa_item = proto_tree_add_item(chunk_tree, hf_nr_sack_chunk_cumulative_tsn_ack, chunk_tvb, NR_SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET, NR_SACK_CHUNK_CUMULATIVE_TSN_ACK_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_nr_sack_chunk_adv_rec_window_credit, chunk_tvb, NR_SACK_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET, NR_SACK_CHUNK_ADV_REC_WINDOW_CREDIT_LENGTH, REP_BIG_ENDIAN);
|
|
|
|
num_of_gap_blocks = proto_tree_add_item(chunk_tree, hf_nr_sack_chunk_number_of_gap_blocks, chunk_tvb, NR_SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_OFFSET, NR_SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_LENGTH, REP_BIG_ENDIAN);
|
|
|
|
proto_tree_add_item(chunk_tree, hf_nr_sack_chunk_number_of_nr_gap_blocks, chunk_tvb, NR_SACK_CHUNK_NUMBER_OF_NR_GAP_BLOCKS_OFFSET, NR_SACK_CHUNK_NUMBER_OF_NR_GAP_BLOCKS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_nr_sack_chunk_number_of_dup_tsns, chunk_tvb, NR_SACK_CHUNK_NUMBER_OF_DUP_TSNS_OFFSET, NR_SACK_CHUNK_NUMBER_OF_DUP_TSNS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_nr_sack_chunk_reserved, chunk_tvb, NR_SACK_CHUNK_RESERVED_OFFSET, NR_SACK_CHUNK_RESERVED_LENGTH, REP_BIG_ENDIAN);
|
|
|
|
|
|
number_of_gap_blocks = tvb_get_ntohs(chunk_tvb, NR_SACK_CHUNK_NUMBER_OF_GAP_BLOCKS_OFFSET);
|
|
gap_block_offset = NR_SACK_CHUNK_GAP_BLOCK_OFFSET;
|
|
cum_tsn_ack = tvb_get_ntohl(chunk_tvb, NR_SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET);
|
|
|
|
acks_tree = proto_item_add_subtree(ctsa_item,ett_sctp_ack);
|
|
sctp_ack_block(pinfo, ha, chunk_tvb, acks_tree, NULL, cum_tsn_ack);
|
|
|
|
for(gap_block_number = 1; gap_block_number <= number_of_gap_blocks; gap_block_number++) {
|
|
proto_item *pi;
|
|
proto_tree *pt;
|
|
guint32 tsn_start;
|
|
|
|
start = tvb_get_ntohs(chunk_tvb, gap_block_offset);
|
|
end = tvb_get_ntohs(chunk_tvb, gap_block_offset + NR_SACK_CHUNK_GAP_BLOCK_START_LENGTH);
|
|
tsn_start = cum_tsn_ack + start;
|
|
|
|
block_item = proto_tree_add_text(chunk_tree, chunk_tvb, gap_block_offset, NR_SACK_CHUNK_GAP_BLOCK_LENGTH, "Gap Acknowledgement for TSN %u to %u", cum_tsn_ack + start, cum_tsn_ack + end);
|
|
block_tree = proto_item_add_subtree(block_item, ett_sctp_nr_sack_chunk_gap_block);
|
|
|
|
pi = proto_tree_add_item(block_tree, hf_nr_sack_chunk_gap_block_start, chunk_tvb, gap_block_offset, NR_SACK_CHUNK_GAP_BLOCK_START_LENGTH, REP_BIG_ENDIAN);
|
|
pt = proto_item_add_subtree(pi, ett_sctp_nr_sack_chunk_gap_block_start);
|
|
pi = proto_tree_add_uint(pt, hf_nr_sack_chunk_gap_block_start_tsn,
|
|
chunk_tvb, gap_block_offset,NR_SACK_CHUNK_GAP_BLOCK_START_LENGTH, cum_tsn_ack + start);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
pi = proto_tree_add_item(block_tree, hf_nr_sack_chunk_gap_block_end, chunk_tvb, gap_block_offset + NR_SACK_CHUNK_GAP_BLOCK_START_LENGTH, NR_SACK_CHUNK_GAP_BLOCK_END_LENGTH, REP_BIG_ENDIAN);
|
|
pt = proto_item_add_subtree(pi, ett_sctp_nr_sack_chunk_gap_block_end);
|
|
pi = proto_tree_add_uint(pt, hf_nr_sack_chunk_gap_block_end_tsn, chunk_tvb,
|
|
gap_block_offset + NR_SACK_CHUNK_GAP_BLOCK_START_LENGTH, NR_SACK_CHUNK_GAP_BLOCK_END_LENGTH, cum_tsn_ack + end);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
sctp_ack_block(pinfo, ha, chunk_tvb, block_tree, &tsn_start, cum_tsn_ack + end);
|
|
gap_block_offset += NR_SACK_CHUNK_GAP_BLOCK_LENGTH;
|
|
tsns_gap_acked += (end - start) + 1;
|
|
}
|
|
|
|
if (tsns_gap_acked) {
|
|
proto_item *pi;
|
|
|
|
pi = proto_tree_add_uint(chunk_tree, hf_nr_sack_chunk_number_tsns_gap_acked, chunk_tvb, 0, 0, tsns_gap_acked);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
/* If there are a huge number of GAP ACKs, warn the user. 100 is a random
|
|
* number: it could be tuned.
|
|
*/
|
|
if (tsns_gap_acked > 100)
|
|
expert_add_info_format(pinfo, pi, PI_SEQUENCE, PI_WARN, "More than 100 TSNs were gap-acknowledged in this NR-SACK");
|
|
|
|
}
|
|
|
|
/* NE: handle the nr-sack chunk's nr-gap blocks */
|
|
number_of_nr_gap_blocks = tvb_get_ntohs(chunk_tvb, NR_SACK_CHUNK_NUMBER_OF_NR_GAP_BLOCKS_OFFSET);
|
|
nr_gap_block_offset = gap_block_offset;
|
|
|
|
for(nr_gap_block_number = 1; nr_gap_block_number <= number_of_nr_gap_blocks; nr_gap_block_number++) {
|
|
proto_item *pi;
|
|
proto_tree *pt;
|
|
guint32 tsn_start;
|
|
|
|
start = tvb_get_ntohs(chunk_tvb, nr_gap_block_offset);
|
|
end = tvb_get_ntohs(chunk_tvb, nr_gap_block_offset + NR_SACK_CHUNK_NR_GAP_BLOCK_START_LENGTH);
|
|
tsn_start = cum_tsn_ack + start;
|
|
|
|
block_item = proto_tree_add_text(chunk_tree, chunk_tvb, nr_gap_block_offset, NR_SACK_CHUNK_NR_GAP_BLOCK_LENGTH, "NR-Gap Acknowledgement for TSN %u to %u", cum_tsn_ack + start, cum_tsn_ack + end);
|
|
block_tree = proto_item_add_subtree(block_item, ett_sctp_nr_sack_chunk_nr_gap_block);
|
|
|
|
pi = proto_tree_add_item(block_tree, hf_nr_sack_chunk_nr_gap_block_start, chunk_tvb, nr_gap_block_offset, NR_SACK_CHUNK_NR_GAP_BLOCK_START_LENGTH, REP_BIG_ENDIAN);
|
|
pt = proto_item_add_subtree(pi, ett_sctp_nr_sack_chunk_nr_gap_block_start);
|
|
pi = proto_tree_add_uint(pt, hf_nr_sack_chunk_nr_gap_block_start_tsn,
|
|
chunk_tvb, nr_gap_block_offset, NR_SACK_CHUNK_NR_GAP_BLOCK_START_LENGTH, cum_tsn_ack + start);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
pi = proto_tree_add_item(block_tree, hf_nr_sack_chunk_nr_gap_block_end, chunk_tvb, nr_gap_block_offset + NR_SACK_CHUNK_NR_GAP_BLOCK_START_LENGTH, NR_SACK_CHUNK_NR_GAP_BLOCK_END_LENGTH, REP_BIG_ENDIAN);
|
|
pt = proto_item_add_subtree(pi, ett_sctp_nr_sack_chunk_nr_gap_block_end);
|
|
pi = proto_tree_add_uint(pt, hf_nr_sack_chunk_nr_gap_block_end_tsn, chunk_tvb,
|
|
nr_gap_block_offset + NR_SACK_CHUNK_NR_GAP_BLOCK_START_LENGTH, NR_SACK_CHUNK_NR_GAP_BLOCK_END_LENGTH, cum_tsn_ack + end);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
/* sctp_ack_block(pinfo, ha, chunk_tvb, block_tree, &tsn_start, cum_tsn_ack + end); */
|
|
nr_gap_block_offset += NR_SACK_CHUNK_NR_GAP_BLOCK_LENGTH;
|
|
tsns_nr_gap_acked += (end - start) + 1;
|
|
}
|
|
|
|
if (tsns_nr_gap_acked) {
|
|
proto_item *pi;
|
|
|
|
pi = proto_tree_add_uint(chunk_tree, hf_nr_sack_chunk_number_tsns_nr_gap_acked, chunk_tvb, 0, 0, tsns_nr_gap_acked);
|
|
PROTO_ITEM_SET_GENERATED(pi);
|
|
|
|
/* If there are a huge number of GAP ACKs, warn the user. 100 is a random
|
|
* number: it could be tuned.
|
|
*/
|
|
if (tsns_nr_gap_acked > 100)
|
|
expert_add_info_format(pinfo, pi, PI_SEQUENCE, PI_WARN, "More than 100 TSNs were nr-gap-acknowledged in this NR-SACK");
|
|
}
|
|
|
|
/* handle the duplicate TSNs */
|
|
number_of_dup_tsns = tvb_get_ntohs(chunk_tvb, NR_SACK_CHUNK_NUMBER_OF_DUP_TSNS_OFFSET);
|
|
dup_tsn_offset = NR_SACK_CHUNK_GAP_BLOCK_OFFSET + number_of_gap_blocks * NR_SACK_CHUNK_GAP_BLOCK_LENGTH
|
|
+ number_of_nr_gap_blocks * NR_SACK_CHUNK_NR_GAP_BLOCK_LENGTH;
|
|
|
|
|
|
for(dup_tsn_number = 1; dup_tsn_number <= number_of_dup_tsns; dup_tsn_number++) {
|
|
proto_tree_add_item(chunk_tree, hf_sack_chunk_duplicate_tsn, chunk_tvb, dup_tsn_offset, NR_SACK_CHUNK_DUP_TSN_LENGTH, REP_BIG_ENDIAN);
|
|
dup_tsn_offset += NR_SACK_CHUNK_DUP_TSN_LENGTH;
|
|
}
|
|
|
|
proto_item_append_text(chunk_item, " (Cumulative TSN: %u, a_rwnd: %u, gaps: %u, nr-gaps: %u, duplicate TSNs: %u)",
|
|
tvb_get_ntohl(chunk_tvb, NR_SACK_CHUNK_CUMULATIVE_TSN_ACK_OFFSET),
|
|
tvb_get_ntohl(chunk_tvb, NR_SACK_CHUNK_ADV_REC_WINDOW_CREDIT_OFFSET),
|
|
number_of_gap_blocks, number_of_nr_gap_blocks, number_of_dup_tsns);
|
|
}
|
|
|
|
#define HEARTBEAT_CHUNK_INFO_OFFSET CHUNK_VALUE_OFFSET
|
|
|
|
static void
|
|
dissect_heartbeat_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, packet_info *pinfo, proto_tree *chunk_tree, proto_item *chunk_item)
|
|
{
|
|
tvbuff_t *parameter_tvb;
|
|
|
|
if (chunk_tree) {
|
|
proto_item_append_text(chunk_item, " (Information: %u byte%s)", chunk_length - CHUNK_HEADER_LENGTH, plurality(chunk_length - CHUNK_HEADER_LENGTH, "", "s"));
|
|
parameter_tvb = tvb_new_subset(chunk_tvb, HEARTBEAT_CHUNK_INFO_OFFSET, chunk_length - CHUNK_HEADER_LENGTH, chunk_length - CHUNK_HEADER_LENGTH);
|
|
/* FIXME: Parameters or parameter? */
|
|
dissect_parameter(parameter_tvb, pinfo, chunk_tree, NULL, FALSE);
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_heartbeat_ack_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, packet_info *pinfo, proto_tree *chunk_tree, proto_item *chunk_item)
|
|
{
|
|
tvbuff_t *parameter_tvb;
|
|
|
|
if (chunk_tree) {
|
|
proto_item_append_text(chunk_item, " (Information: %u byte%s)", chunk_length - CHUNK_HEADER_LENGTH, plurality(chunk_length - CHUNK_HEADER_LENGTH, "", "s"));
|
|
parameter_tvb = tvb_new_subset(chunk_tvb, HEARTBEAT_CHUNK_INFO_OFFSET, chunk_length - CHUNK_HEADER_LENGTH, chunk_length - CHUNK_HEADER_LENGTH);
|
|
/* FIXME: Parameters or parameter? */
|
|
dissect_parameter(parameter_tvb, pinfo, chunk_tree, NULL, FALSE);
|
|
}
|
|
}
|
|
|
|
#define ABORT_CHUNK_FIRST_ERROR_CAUSE_OFFSET 4
|
|
#define SCTP_ABORT_CHUNK_T_BIT 0x01
|
|
|
|
static void
|
|
dissect_abort_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, packet_info *pinfo, proto_tree *chunk_tree, proto_item *flags_item)
|
|
{
|
|
tvbuff_t *causes_tvb;
|
|
proto_tree *flags_tree;
|
|
|
|
sctp_info.vtag_reflected =
|
|
(tvb_get_guint8(chunk_tvb, CHUNK_FLAGS_OFFSET) & SCTP_ABORT_CHUNK_T_BIT) != 0;
|
|
|
|
if (chunk_tree) {
|
|
flags_tree = proto_item_add_subtree(flags_item, ett_sctp_abort_chunk_flags);
|
|
proto_tree_add_item(flags_tree, hf_abort_chunk_t_bit, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, REP_BIG_ENDIAN);
|
|
causes_tvb = tvb_new_subset(chunk_tvb, CHUNK_VALUE_OFFSET, chunk_length - CHUNK_HEADER_LENGTH, chunk_length - CHUNK_HEADER_LENGTH);
|
|
dissect_error_causes(causes_tvb, pinfo, chunk_tree);
|
|
}
|
|
}
|
|
|
|
#define SHUTDOWN_CHUNK_CUMULATIVE_TSN_ACK_OFFSET CHUNK_VALUE_OFFSET
|
|
#define SHUTDOWN_CHUNK_CUMULATIVE_TSN_ACK_LENGTH 4
|
|
|
|
static void
|
|
dissect_shutdown_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item)
|
|
{
|
|
if (chunk_tree) {
|
|
proto_tree_add_item(chunk_tree, hf_shutdown_chunk_cumulative_tsn_ack, chunk_tvb, SHUTDOWN_CHUNK_CUMULATIVE_TSN_ACK_OFFSET, SHUTDOWN_CHUNK_CUMULATIVE_TSN_ACK_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(chunk_item, " (Cumulative TSN ack: %u)", tvb_get_ntohl(chunk_tvb, SHUTDOWN_CHUNK_CUMULATIVE_TSN_ACK_OFFSET));
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_shutdown_ack_chunk(tvbuff_t *chunk_tvb _U_)
|
|
{
|
|
}
|
|
|
|
#define ERROR_CAUSE_IND_CAUSES_OFFSET CHUNK_VALUE_OFFSET
|
|
|
|
static void
|
|
dissect_error_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, packet_info *pinfo, proto_tree *chunk_tree)
|
|
{
|
|
tvbuff_t *causes_tvb;
|
|
|
|
if (chunk_tree) {
|
|
causes_tvb = tvb_new_subset(chunk_tvb, ERROR_CAUSE_IND_CAUSES_OFFSET, chunk_length - CHUNK_HEADER_LENGTH, chunk_length - CHUNK_HEADER_LENGTH);
|
|
dissect_error_causes(causes_tvb, pinfo, chunk_tree);
|
|
}
|
|
}
|
|
|
|
#define COOKIE_OFFSET CHUNK_VALUE_OFFSET
|
|
|
|
static void
|
|
dissect_cookie_echo_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, proto_tree *chunk_tree, proto_item *chunk_item)
|
|
{
|
|
if (chunk_tree) {
|
|
proto_tree_add_item(chunk_tree, hf_cookie, chunk_tvb, COOKIE_OFFSET, chunk_length - CHUNK_HEADER_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(chunk_item, " (Cookie length: %u byte%s)", chunk_length - CHUNK_HEADER_LENGTH, plurality(chunk_length - CHUNK_HEADER_LENGTH, "", "s"));
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_cookie_ack_chunk(tvbuff_t *chunk_tvb _U_)
|
|
{
|
|
}
|
|
|
|
#define ECNE_CHUNK_LOWEST_TSN_OFFSET CHUNK_VALUE_OFFSET
|
|
#define ECNE_CHUNK_LOWEST_TSN_LENGTH 4
|
|
|
|
static void
|
|
dissect_ecne_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item)
|
|
{
|
|
if (chunk_tree)
|
|
proto_tree_add_item(chunk_tree, hf_ecne_chunk_lowest_tsn, chunk_tvb, ECNE_CHUNK_LOWEST_TSN_OFFSET, ECNE_CHUNK_LOWEST_TSN_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(chunk_item, " (Lowest TSN: %u)", tvb_get_ntohl(chunk_tvb, ECNE_CHUNK_LOWEST_TSN_OFFSET));
|
|
}
|
|
|
|
#define CWR_CHUNK_LOWEST_TSN_OFFSET CHUNK_VALUE_OFFSET
|
|
#define CWR_CHUNK_LOWEST_TSN_LENGTH 4
|
|
|
|
static void
|
|
dissect_cwr_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *chunk_item)
|
|
{
|
|
if (chunk_tree)
|
|
proto_tree_add_item(chunk_tree, hf_cwr_chunk_lowest_tsn, chunk_tvb, CWR_CHUNK_LOWEST_TSN_OFFSET, CWR_CHUNK_LOWEST_TSN_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(chunk_item, " (Lowest TSN: %u)", tvb_get_ntohl(chunk_tvb, CWR_CHUNK_LOWEST_TSN_OFFSET));
|
|
}
|
|
|
|
#define SCTP_SHUTDOWN_COMPLETE_CHUNK_T_BIT 0x01
|
|
|
|
|
|
static const true_false_string sctp_shutdown_complete_chunk_t_bit_value = {
|
|
"Tag reflected",
|
|
"Tag not reflected"
|
|
};
|
|
|
|
|
|
static void
|
|
dissect_shutdown_complete_chunk(tvbuff_t *chunk_tvb, proto_tree *chunk_tree, proto_item *flags_item)
|
|
{
|
|
proto_tree *flags_tree;
|
|
|
|
sctp_info.vtag_reflected =
|
|
(tvb_get_guint8(chunk_tvb, CHUNK_FLAGS_OFFSET) & SCTP_SHUTDOWN_COMPLETE_CHUNK_T_BIT) != 0;
|
|
|
|
if (chunk_tree) {
|
|
flags_tree = proto_item_add_subtree(flags_item, ett_sctp_shutdown_complete_chunk_flags);
|
|
proto_tree_add_item(flags_tree, hf_shutdown_complete_chunk_t_bit, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, REP_BIG_ENDIAN);
|
|
}
|
|
}
|
|
|
|
#define FORWARD_TSN_CHUNK_TSN_LENGTH 4
|
|
#define FORWARD_TSN_CHUNK_SID_LENGTH 2
|
|
#define FORWARD_TSN_CHUNK_SSN_LENGTH 2
|
|
#define FORWARD_TSN_CHUNK_TSN_OFFSET CHUNK_VALUE_OFFSET
|
|
#define FORWARD_TSN_CHUNK_SID_OFFSET 0
|
|
#define FORWARD_TSN_CHUNK_SSN_OFFSET (FORWARD_TSN_CHUNK_SID_OFFSET + FORWARD_TSN_CHUNK_SID_LENGTH)
|
|
|
|
static void
|
|
dissect_forward_tsn_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, proto_tree *chunk_tree, proto_item *chunk_item)
|
|
{
|
|
guint offset;
|
|
guint16 number_of_affected_streams, affected_stream;
|
|
|
|
/* FIXME */
|
|
if (chunk_length < CHUNK_HEADER_LENGTH + FORWARD_TSN_CHUNK_TSN_LENGTH) {
|
|
proto_item_append_text(chunk_item, ", bogus chunk length %u < %u)",
|
|
chunk_length,
|
|
CHUNK_HEADER_LENGTH + FORWARD_TSN_CHUNK_TSN_LENGTH);
|
|
return;
|
|
}
|
|
if (chunk_tree) {
|
|
proto_tree_add_item(chunk_tree, hf_forward_tsn_chunk_tsn, chunk_tvb, FORWARD_TSN_CHUNK_TSN_OFFSET, FORWARD_TSN_CHUNK_TSN_LENGTH, REP_BIG_ENDIAN);
|
|
number_of_affected_streams = (chunk_length - CHUNK_HEADER_LENGTH - FORWARD_TSN_CHUNK_TSN_LENGTH) /
|
|
(FORWARD_TSN_CHUNK_SID_LENGTH + FORWARD_TSN_CHUNK_SSN_LENGTH);
|
|
offset = CHUNK_VALUE_OFFSET + FORWARD_TSN_CHUNK_TSN_LENGTH;
|
|
|
|
for(affected_stream = 0; affected_stream < number_of_affected_streams; affected_stream++) {
|
|
proto_tree_add_item(chunk_tree, hf_forward_tsn_chunk_sid, chunk_tvb, offset + FORWARD_TSN_CHUNK_SID_OFFSET, FORWARD_TSN_CHUNK_SID_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_forward_tsn_chunk_ssn, chunk_tvb, offset + FORWARD_TSN_CHUNK_SSN_OFFSET, FORWARD_TSN_CHUNK_SSN_LENGTH, REP_BIG_ENDIAN);
|
|
offset = offset + (FORWARD_TSN_CHUNK_SID_LENGTH + FORWARD_TSN_CHUNK_SSN_LENGTH);
|
|
}
|
|
proto_item_append_text(chunk_item, "(Cumulative TSN: %u)", tvb_get_ntohl(chunk_tvb, FORWARD_TSN_CHUNK_TSN_OFFSET));
|
|
}
|
|
}
|
|
|
|
#define STREAM_RESET_PARAMETERS_OFFSET CHUNK_HEADER_LENGTH
|
|
|
|
static void
|
|
dissect_stream_reset_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, packet_info *pinfo, proto_tree *chunk_tree, proto_item *chunk_item _U_)
|
|
{
|
|
tvbuff_t *parameters_tvb;
|
|
|
|
if (chunk_tree) {
|
|
parameters_tvb = tvb_new_subset(chunk_tvb, STREAM_RESET_PARAMETERS_OFFSET, chunk_length - CHUNK_HEADER_LENGTH, chunk_length - CHUNK_HEADER_LENGTH);
|
|
dissect_parameters(parameters_tvb, pinfo, chunk_tree, NULL, FALSE);
|
|
}
|
|
}
|
|
|
|
#define SHARED_KEY_ID_LENGTH 2
|
|
|
|
#define SHARED_KEY_ID_OFFSET PARAMETER_VALUE_OFFSET
|
|
#define HMAC_ID_OFFSET (SHARED_KEY_ID_OFFSET + SHARED_KEY_ID_LENGTH)
|
|
#define HMAC_OFFSET (HMAC_ID_OFFSET + HMAC_ID_LENGTH)
|
|
|
|
static void
|
|
dissect_auth_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, proto_tree *chunk_tree, proto_item *chunk_item _U_)
|
|
{
|
|
guint hmac_length;
|
|
|
|
hmac_length = chunk_length - CHUNK_HEADER_LENGTH - HMAC_ID_LENGTH - SHARED_KEY_ID_LENGTH;
|
|
proto_tree_add_item(chunk_tree, hf_shared_key_id, chunk_tvb, SHARED_KEY_ID_OFFSET, SHARED_KEY_ID_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_hmac_id, chunk_tvb, HMAC_ID_OFFSET, HMAC_ID_LENGTH, REP_BIG_ENDIAN);
|
|
if (hmac_length > 0)
|
|
proto_tree_add_item(chunk_tree, hf_hmac, chunk_tvb, HMAC_OFFSET, hmac_length, REP_BIG_ENDIAN);
|
|
}
|
|
|
|
#define SCTP_SERIAL_NUMBER_LENGTH 4
|
|
#define SERIAL_NUMBER_OFFSET CHUNK_VALUE_OFFSET
|
|
#define ASCONF_CHUNK_PARAMETERS_OFFSET (SERIAL_NUMBER_OFFSET + SCTP_SERIAL_NUMBER_LENGTH)
|
|
|
|
static void
|
|
dissect_asconf_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, packet_info *pinfo, proto_tree *chunk_tree, proto_item *chunk_item)
|
|
{
|
|
tvbuff_t *parameters_tvb;
|
|
|
|
if (chunk_length < CHUNK_HEADER_LENGTH + SCTP_SERIAL_NUMBER_LENGTH) {
|
|
proto_item_append_text(chunk_item, ", bogus chunk length %u < %u)",
|
|
chunk_length,
|
|
CHUNK_HEADER_LENGTH + SCTP_SERIAL_NUMBER_LENGTH);
|
|
return;
|
|
}
|
|
if (chunk_tree) {
|
|
proto_tree_add_item(chunk_tree, hf_asconf_serial, chunk_tvb, SERIAL_NUMBER_OFFSET, SCTP_SERIAL_NUMBER_LENGTH, REP_BIG_ENDIAN);
|
|
chunk_length -= CHUNK_HEADER_LENGTH + SCTP_SERIAL_NUMBER_LENGTH;
|
|
parameters_tvb = tvb_new_subset(chunk_tvb, ASCONF_CHUNK_PARAMETERS_OFFSET, chunk_length, chunk_length);
|
|
dissect_parameters(parameters_tvb, pinfo, chunk_tree, NULL, FALSE);
|
|
}
|
|
}
|
|
|
|
#define ASCONF_ACK_CHUNK_PARAMETERS_OFFSET (SERIAL_NUMBER_OFFSET + SCTP_SERIAL_NUMBER_LENGTH)
|
|
|
|
static void
|
|
dissect_asconf_ack_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, packet_info *pinfo, proto_tree *chunk_tree, proto_item *chunk_item)
|
|
{
|
|
tvbuff_t *parameters_tvb;
|
|
|
|
if (chunk_length < CHUNK_HEADER_LENGTH + SCTP_SERIAL_NUMBER_LENGTH) {
|
|
proto_item_append_text(chunk_item, ", bogus chunk length %u < %u)",
|
|
chunk_length + CHUNK_HEADER_LENGTH,
|
|
CHUNK_HEADER_LENGTH + SCTP_SERIAL_NUMBER_LENGTH);
|
|
return;
|
|
}
|
|
if (chunk_tree) {
|
|
proto_tree_add_item(chunk_tree, hf_asconf_ack_serial, chunk_tvb, SERIAL_NUMBER_OFFSET, SCTP_SERIAL_NUMBER_LENGTH, REP_BIG_ENDIAN);
|
|
chunk_length -= CHUNK_HEADER_LENGTH + SCTP_SERIAL_NUMBER_LENGTH;
|
|
parameters_tvb = tvb_new_subset(chunk_tvb, ASCONF_ACK_CHUNK_PARAMETERS_OFFSET, chunk_length, chunk_length);
|
|
dissect_parameters(parameters_tvb, pinfo, chunk_tree, NULL, FALSE);
|
|
}
|
|
}
|
|
|
|
#define PKTDROP_CHUNK_BANDWIDTH_LENGTH 4
|
|
#define PKTDROP_CHUNK_QUEUESIZE_LENGTH 4
|
|
#define PKTDROP_CHUNK_TRUNCATED_SIZE_LENGTH 2
|
|
#define PKTDROP_CHUNK_RESERVED_SIZE_LENGTH 2
|
|
|
|
#define PKTDROP_CHUNK_HEADER_LENGTH (CHUNK_HEADER_LENGTH + \
|
|
PKTDROP_CHUNK_BANDWIDTH_LENGTH + \
|
|
PKTDROP_CHUNK_QUEUESIZE_LENGTH + \
|
|
PKTDROP_CHUNK_TRUNCATED_SIZE_LENGTH + \
|
|
PKTDROP_CHUNK_RESERVED_SIZE_LENGTH)
|
|
|
|
#define PKTDROP_CHUNK_BANDWIDTH_OFFSET CHUNK_VALUE_OFFSET
|
|
#define PKTDROP_CHUNK_QUEUESIZE_OFFSET (PKTDROP_CHUNK_BANDWIDTH_OFFSET + PKTDROP_CHUNK_BANDWIDTH_LENGTH)
|
|
#define PKTDROP_CHUNK_TRUNCATED_SIZE_OFFSET (PKTDROP_CHUNK_QUEUESIZE_OFFSET + PKTDROP_CHUNK_QUEUESIZE_LENGTH)
|
|
#define PKTDROP_CHUNK_RESERVED_SIZE_OFFSET (PKTDROP_CHUNK_TRUNCATED_SIZE_OFFSET + PKTDROP_CHUNK_TRUNCATED_SIZE_LENGTH)
|
|
#define PKTDROP_CHUNK_DATA_FIELD_OFFSET (PKTDROP_CHUNK_RESERVED_SIZE_OFFSET + PKTDROP_CHUNK_RESERVED_SIZE_LENGTH)
|
|
|
|
#define SCTP_PKTDROP_CHUNK_M_BIT 0x01
|
|
#define SCTP_PKTDROP_CHUNK_B_BIT 0x02
|
|
#define SCTP_PKTDROP_CHUNK_T_BIT 0x04
|
|
|
|
static const true_false_string sctp_pktdropk_m_bit_value = {
|
|
"Source is a middlebox",
|
|
"Source is an endhost"
|
|
};
|
|
|
|
static const true_false_string sctp_pktdropk_b_bit_value = {
|
|
"SCTP checksum was incorrect",
|
|
"SCTP checksum was correct"
|
|
};
|
|
|
|
static const true_false_string sctp_pktdropk_t_bit_value = {
|
|
"Packet is truncated",
|
|
"Packet is not truncated"
|
|
};
|
|
|
|
static void
|
|
dissect_pktdrop_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, packet_info *pinfo, proto_tree *chunk_tree, proto_item *chunk_item, proto_item *flags_item)
|
|
{
|
|
tvbuff_t *data_field_tvb;
|
|
proto_tree *flags_tree;
|
|
|
|
if (chunk_length < PKTDROP_CHUNK_HEADER_LENGTH) {
|
|
proto_item_append_text(chunk_item, ", bogus chunk length %u < %u)",
|
|
chunk_length,
|
|
PKTDROP_CHUNK_HEADER_LENGTH);
|
|
return;
|
|
}
|
|
chunk_length -= PKTDROP_CHUNK_HEADER_LENGTH;
|
|
data_field_tvb = tvb_new_subset(chunk_tvb, PKTDROP_CHUNK_DATA_FIELD_OFFSET, chunk_length, chunk_length);
|
|
|
|
if (chunk_tree) {
|
|
flags_tree = proto_item_add_subtree(flags_item, ett_sctp_pktdrop_chunk_flags);
|
|
|
|
proto_tree_add_item(flags_tree, hf_pktdrop_chunk_m_bit, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(flags_tree, hf_pktdrop_chunk_b_bit, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(flags_tree, hf_pktdrop_chunk_t_bit, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_pktdrop_chunk_bandwidth, chunk_tvb, PKTDROP_CHUNK_BANDWIDTH_OFFSET, PKTDROP_CHUNK_BANDWIDTH_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_pktdrop_chunk_queuesize, chunk_tvb, PKTDROP_CHUNK_QUEUESIZE_OFFSET, PKTDROP_CHUNK_QUEUESIZE_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_pktdrop_chunk_truncated_length, chunk_tvb, PKTDROP_CHUNK_TRUNCATED_SIZE_OFFSET, PKTDROP_CHUNK_TRUNCATED_SIZE_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_pktdrop_chunk_reserved, chunk_tvb, PKTDROP_CHUNK_RESERVED_SIZE_OFFSET, PKTDROP_CHUNK_RESERVED_SIZE_LENGTH, REP_BIG_ENDIAN);
|
|
/* XXX - set pinfo->in_error_pkt? */
|
|
if (chunk_length > 0) {
|
|
if (tvb_get_guint8(chunk_tvb, CHUNK_FLAGS_OFFSET) & SCTP_PKTDROP_CHUNK_T_BIT)
|
|
proto_tree_add_item(chunk_tree, hf_pktdrop_chunk_data_field, chunk_tvb, PKTDROP_CHUNK_DATA_FIELD_OFFSET, chunk_length, REP_BIG_ENDIAN);
|
|
else
|
|
dissect_sctp_packet(data_field_tvb, pinfo, chunk_tree, TRUE);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_unknown_chunk(tvbuff_t *chunk_tvb, guint16 chunk_length, guint8 chunk_type, proto_tree *chunk_tree, proto_item *chunk_item)
|
|
{
|
|
if (chunk_tree) {
|
|
if (chunk_length > CHUNK_HEADER_LENGTH)
|
|
proto_tree_add_item(chunk_tree, hf_chunk_value, chunk_tvb, CHUNK_VALUE_OFFSET, chunk_length - CHUNK_HEADER_LENGTH, REP_BIG_ENDIAN);
|
|
proto_item_append_text(chunk_item, " (Type: %u, value length: %u byte%s)", chunk_type, chunk_length, plurality(chunk_length - CHUNK_HEADER_LENGTH, "", "s"));
|
|
}
|
|
}
|
|
|
|
#define SCTP_CHUNK_BIT_1 0x80
|
|
#define SCTP_CHUNK_BIT_2 0x40
|
|
|
|
static const true_false_string sctp_chunk_bit_1_value = {
|
|
"Skip chunk and continue processing of the packet",
|
|
"Stop processing of the packet"
|
|
};
|
|
|
|
static const true_false_string sctp_chunk_bit_2_value = {
|
|
"Do report",
|
|
"Do not report"
|
|
};
|
|
|
|
|
|
static gboolean
|
|
dissect_sctp_chunk(tvbuff_t *chunk_tvb,
|
|
packet_info *pinfo,
|
|
proto_tree *tree,
|
|
proto_tree *sctp_tree,
|
|
sctp_half_assoc_t* ha,
|
|
gboolean useinfo)
|
|
{
|
|
guint8 type, flags;
|
|
guint16 length, padding_length;
|
|
gboolean result;
|
|
proto_item *flags_item;
|
|
proto_item *chunk_item;
|
|
proto_tree *chunk_tree;
|
|
proto_item *type_item;
|
|
proto_tree *type_tree;
|
|
|
|
result = FALSE;
|
|
|
|
/* first extract the chunk header */
|
|
type = tvb_get_guint8(chunk_tvb, CHUNK_TYPE_OFFSET);
|
|
flags = tvb_get_guint8(chunk_tvb, CHUNK_FLAGS_OFFSET);
|
|
length = tvb_get_ntohs(chunk_tvb, CHUNK_LENGTH_OFFSET);
|
|
padding_length = tvb_length(chunk_tvb) - length;
|
|
|
|
if (useinfo)
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, "%s ", val_to_str(type, chunk_type_values, "RESERVED"));
|
|
|
|
if (tree) {
|
|
/* create proto_tree stuff */
|
|
chunk_item = proto_tree_add_text(sctp_tree, chunk_tvb, CHUNK_HEADER_OFFSET, tvb_length(chunk_tvb), "%s chunk", val_to_str(type, chunk_type_values, "RESERVED"));
|
|
chunk_tree = proto_item_add_subtree(chunk_item, ett_sctp_chunk);
|
|
|
|
/* then insert the chunk header components into the protocol tree */
|
|
type_item = proto_tree_add_item(chunk_tree, hf_chunk_type, chunk_tvb, CHUNK_TYPE_OFFSET, CHUNK_TYPE_LENGTH, REP_BIG_ENDIAN);
|
|
type_tree = proto_item_add_subtree(type_item, ett_sctp_chunk_type);
|
|
proto_tree_add_item(type_tree, hf_chunk_bit_1, chunk_tvb, CHUNK_TYPE_OFFSET, CHUNK_TYPE_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(type_tree, hf_chunk_bit_2, chunk_tvb, CHUNK_TYPE_OFFSET, CHUNK_TYPE_LENGTH, REP_BIG_ENDIAN);
|
|
flags_item = proto_tree_add_item(chunk_tree, hf_chunk_flags, chunk_tvb, CHUNK_FLAGS_OFFSET, CHUNK_FLAGS_LENGTH, REP_BIG_ENDIAN);
|
|
} else {
|
|
chunk_tree = NULL;
|
|
chunk_item = NULL;
|
|
flags_item = NULL;
|
|
}
|
|
if (length < CHUNK_HEADER_LENGTH) {
|
|
if (tree) {
|
|
proto_tree_add_uint_format(chunk_tree, hf_chunk_length, chunk_tvb,
|
|
CHUNK_LENGTH_OFFSET, CHUNK_LENGTH_LENGTH,
|
|
length,
|
|
"Chunk length: %u (invalid, should be >= %u)",
|
|
length, CHUNK_HEADER_LENGTH);
|
|
proto_item_append_text(chunk_item, ", bogus chunk length %u < %u)",
|
|
length, CHUNK_HEADER_LENGTH);
|
|
}
|
|
if (type == SCTP_DATA_CHUNK_ID)
|
|
result = TRUE;
|
|
return result;
|
|
}
|
|
if (tree) {
|
|
proto_tree_add_uint(chunk_tree, hf_chunk_length, chunk_tvb, CHUNK_LENGTH_OFFSET, CHUNK_LENGTH_LENGTH, length);
|
|
}
|
|
/*
|
|
length -= CHUNK_HEADER_LENGTH;
|
|
*/
|
|
|
|
/* now dissect the chunk value */
|
|
switch(type) {
|
|
case SCTP_DATA_CHUNK_ID:
|
|
result = dissect_data_chunk(chunk_tvb, length, pinfo, tree, chunk_tree, chunk_item, flags_item, ha);
|
|
break;
|
|
case SCTP_INIT_CHUNK_ID:
|
|
dissect_init_chunk(chunk_tvb, length, pinfo, chunk_tree, chunk_item);
|
|
break;
|
|
case SCTP_INIT_ACK_CHUNK_ID:
|
|
dissect_init_ack_chunk(chunk_tvb, length, pinfo, chunk_tree, chunk_item);
|
|
break;
|
|
case SCTP_SACK_CHUNK_ID:
|
|
dissect_sack_chunk(pinfo, chunk_tvb, chunk_tree, chunk_item, flags_item, ha);
|
|
break;
|
|
case SCTP_HEARTBEAT_CHUNK_ID:
|
|
dissect_heartbeat_chunk(chunk_tvb, length, pinfo, chunk_tree, chunk_item);
|
|
break;
|
|
case SCTP_HEARTBEAT_ACK_CHUNK_ID:
|
|
dissect_heartbeat_ack_chunk(chunk_tvb, length, pinfo, chunk_tree, chunk_item);
|
|
break;
|
|
case SCTP_ABORT_CHUNK_ID:
|
|
dissect_abort_chunk(chunk_tvb, length, pinfo, chunk_tree, flags_item);
|
|
break;
|
|
case SCTP_SHUTDOWN_CHUNK_ID:
|
|
dissect_shutdown_chunk(chunk_tvb, chunk_tree, chunk_item);
|
|
break;
|
|
case SCTP_SHUTDOWN_ACK_CHUNK_ID:
|
|
dissect_shutdown_ack_chunk(chunk_tvb);
|
|
break;
|
|
case SCTP_ERROR_CHUNK_ID:
|
|
dissect_error_chunk(chunk_tvb, length, pinfo, chunk_tree);
|
|
break;
|
|
case SCTP_COOKIE_ECHO_CHUNK_ID:
|
|
dissect_cookie_echo_chunk(chunk_tvb, length, chunk_tree, chunk_item);
|
|
break;
|
|
case SCTP_COOKIE_ACK_CHUNK_ID:
|
|
dissect_cookie_ack_chunk(chunk_tvb);
|
|
break;
|
|
case SCTP_ECNE_CHUNK_ID:
|
|
dissect_ecne_chunk(chunk_tvb, chunk_tree, chunk_item);
|
|
break;
|
|
case SCTP_CWR_CHUNK_ID:
|
|
dissect_cwr_chunk(chunk_tvb, chunk_tree, chunk_item);
|
|
break;
|
|
case SCTP_SHUTDOWN_COMPLETE_CHUNK_ID:
|
|
dissect_shutdown_complete_chunk(chunk_tvb, chunk_tree, flags_item);
|
|
break;
|
|
case SCTP_FORWARD_TSN_CHUNK_ID:
|
|
dissect_forward_tsn_chunk(chunk_tvb, length, chunk_tree, chunk_item);
|
|
break;
|
|
case SCTP_STREAM_RESET_CHUNK_ID:
|
|
dissect_stream_reset_chunk(chunk_tvb, length, pinfo, chunk_tree, chunk_item);
|
|
break;
|
|
case SCTP_AUTH_CHUNK_ID:
|
|
dissect_auth_chunk(chunk_tvb, length, chunk_tree, chunk_item);
|
|
break;
|
|
case SCTP_NR_SACK_CHUNK_ID:
|
|
dissect_nr_sack_chunk(pinfo, chunk_tvb, chunk_tree, chunk_item, flags_item, ha);
|
|
break;
|
|
case SCTP_ASCONF_ACK_CHUNK_ID:
|
|
dissect_asconf_ack_chunk(chunk_tvb, length, pinfo, chunk_tree, chunk_item);
|
|
break;
|
|
case SCTP_ASCONF_CHUNK_ID:
|
|
dissect_asconf_chunk(chunk_tvb, length, pinfo, chunk_tree, chunk_item);
|
|
break;
|
|
case SCTP_PKTDROP_CHUNK_ID:
|
|
col_set_writable(pinfo->cinfo, FALSE);
|
|
dissect_pktdrop_chunk(chunk_tvb, length, pinfo, chunk_tree, chunk_item, flags_item);
|
|
col_set_writable(pinfo->cinfo, TRUE);
|
|
break;
|
|
default:
|
|
dissect_unknown_chunk(chunk_tvb, length, type, chunk_tree, chunk_item);
|
|
break;
|
|
}
|
|
|
|
if (padding_length > 0)
|
|
proto_tree_add_item(chunk_tree, hf_chunk_padding, chunk_tvb, CHUNK_HEADER_OFFSET + length, padding_length, REP_BIG_ENDIAN);
|
|
|
|
if (useinfo && ((type == SCTP_DATA_CHUNK_ID) || show_always_control_chunks))
|
|
col_set_fence(pinfo->cinfo, COL_INFO);
|
|
|
|
return result;
|
|
}
|
|
|
|
static void
|
|
dissect_sctp_chunks(tvbuff_t *tvb,
|
|
packet_info *pinfo,
|
|
proto_tree *tree,
|
|
proto_item *sctp_item,
|
|
proto_tree *sctp_tree,
|
|
sctp_half_assoc_t* ha,
|
|
gboolean encapsulated)
|
|
{
|
|
tvbuff_t *chunk_tvb;
|
|
guint16 length, total_length, remaining_length;
|
|
gint last_offset, offset;
|
|
gboolean sctp_item_length_set;
|
|
|
|
/* the common header of the datagram is already handled */
|
|
last_offset = 0;
|
|
offset = COMMON_HEADER_LENGTH;
|
|
sctp_item_length_set = FALSE;
|
|
|
|
while((remaining_length = tvb_length_remaining(tvb, offset))) {
|
|
/* extract the chunk length and compute number of padding bytes */
|
|
length = tvb_get_ntohs(tvb, offset + CHUNK_LENGTH_OFFSET);
|
|
total_length = ADD_PADDING(length);
|
|
if (remaining_length >= length)
|
|
total_length = MIN(total_length, remaining_length);
|
|
/* create a tvb for the chunk including the padding bytes */
|
|
chunk_tvb = tvb_new_subset(tvb, offset, total_length, total_length);
|
|
|
|
/* save it in the sctp_info structure */
|
|
if (!encapsulated) {
|
|
if (sctp_info.number_of_tvbs < MAXIMUM_NUMBER_OF_TVBS)
|
|
sctp_info.tvb[sctp_info.number_of_tvbs++] = chunk_tvb;
|
|
else
|
|
sctp_info.incomplete = TRUE;
|
|
}
|
|
|
|
/* call dissect_sctp_chunk for the actual work */
|
|
if (dissect_sctp_chunk(chunk_tvb, pinfo, tree, sctp_tree, ha, !encapsulated) && (tree)) {
|
|
proto_item_set_len(sctp_item, offset - last_offset + DATA_CHUNK_HEADER_LENGTH);
|
|
sctp_item_length_set = TRUE;
|
|
offset += total_length;
|
|
last_offset = offset;
|
|
if (tvb_reported_length_remaining(tvb, offset) > 0) {
|
|
sctp_item = proto_tree_add_item(tree, proto_sctp, tvb, offset, -1, REP_NA);
|
|
sctp_tree = proto_item_add_subtree(sctp_item, ett_sctp);
|
|
sctp_item_length_set = FALSE;
|
|
}
|
|
} else {
|
|
/* get rid of the dissected chunk */
|
|
offset += total_length;
|
|
}
|
|
}
|
|
if (!sctp_item_length_set && (tree)) {
|
|
proto_item_set_len(sctp_item, offset - last_offset);
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_sctp_packet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, gboolean encapsulated)
|
|
{
|
|
guint32 checksum = 0, calculated_crc32c = 0, calculated_adler32 = 0;
|
|
guint16 source_port, destination_port;
|
|
guint length, reported_length;
|
|
gboolean crc32c_correct = FALSE, adler32_correct = FALSE;
|
|
proto_item *sctp_item, *hidden_item;
|
|
proto_tree *sctp_tree;
|
|
guint32 vtag;
|
|
sctp_half_assoc_t* ha = NULL;
|
|
|
|
length = tvb_length(tvb);
|
|
reported_length = tvb_reported_length(tvb);
|
|
checksum = tvb_get_ntohl(tvb, CHECKSUM_OFFSET);
|
|
sctp_info.checksum_zero = (checksum == 0);
|
|
|
|
/* Only try to checksum the packet if we have all of it */
|
|
if (tvb_bytes_exist(tvb, 0, reported_length)) {
|
|
|
|
switch(sctp_checksum) {
|
|
case SCTP_CHECKSUM_NONE:
|
|
break;
|
|
case SCTP_CHECKSUM_ADLER32:
|
|
calculated_adler32 = sctp_adler32(tvb_get_ptr(tvb, 0, length), length);
|
|
adler32_correct = (checksum == calculated_adler32);
|
|
sctp_info.adler32_calculated = TRUE;
|
|
sctp_info.adler32_correct = adler32_correct;
|
|
break;
|
|
case SCTP_CHECKSUM_CRC32C:
|
|
calculated_crc32c = sctp_crc32c(tvb_get_ptr(tvb, 0, length), length);
|
|
crc32c_correct = (checksum == calculated_crc32c);
|
|
sctp_info.crc32c_calculated = TRUE;
|
|
sctp_info.crc32c_correct = crc32c_correct;
|
|
break;
|
|
case SCTP_CHECKSUM_AUTOMATIC:
|
|
calculated_adler32 = sctp_adler32(tvb_get_ptr(tvb, 0, length), length);
|
|
adler32_correct = (checksum == calculated_adler32);
|
|
calculated_crc32c = sctp_crc32c(tvb_get_ptr(tvb, 0, length), length);
|
|
crc32c_correct = (checksum == calculated_crc32c);
|
|
sctp_info.adler32_calculated = TRUE;
|
|
sctp_info.adler32_correct = adler32_correct;
|
|
sctp_info.crc32c_calculated = TRUE;
|
|
sctp_info.crc32c_correct = crc32c_correct;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* In the interest of speed, if "tree" is NULL, don't do any work not
|
|
necessary to generate protocol tree items. */
|
|
source_port = tvb_get_ntohs(tvb, SOURCE_PORT_OFFSET);
|
|
destination_port = tvb_get_ntohs(tvb, DESTINATION_PORT_OFFSET);
|
|
vtag = tvb_get_ntohl(tvb,VERIFICATION_TAG_OFFSET);
|
|
|
|
ha = get_half_assoc(pinfo, source_port, destination_port, vtag);
|
|
|
|
if (tree) {
|
|
|
|
/* create the sctp protocol tree */
|
|
if (show_port_numbers)
|
|
sctp_item = proto_tree_add_protocol_format(tree, proto_sctp, tvb, 0, -1,
|
|
"Stream Control Transmission Protocol, Src Port: %s (%u), Dst Port: %s (%u)",
|
|
get_sctp_port(source_port), source_port,
|
|
get_sctp_port(destination_port), destination_port);
|
|
else
|
|
sctp_item = proto_tree_add_item(tree, proto_sctp, tvb, 0, -1, REP_NA);
|
|
sctp_tree = proto_item_add_subtree(sctp_item, ett_sctp);
|
|
|
|
/* add the components of the common header to the protocol tree */
|
|
proto_tree_add_item(sctp_tree, hf_source_port, tvb, SOURCE_PORT_OFFSET, SOURCE_PORT_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(sctp_tree, hf_destination_port, tvb, DESTINATION_PORT_OFFSET, DESTINATION_PORT_LENGTH, REP_BIG_ENDIAN);
|
|
proto_tree_add_item(sctp_tree, hf_verification_tag, tvb, VERIFICATION_TAG_OFFSET, VERIFICATION_TAG_LENGTH, REP_BIG_ENDIAN);
|
|
hidden_item = proto_tree_add_item(sctp_tree, hf_port, tvb, SOURCE_PORT_OFFSET, SOURCE_PORT_LENGTH, REP_BIG_ENDIAN);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
hidden_item = proto_tree_add_item(sctp_tree, hf_port, tvb, DESTINATION_PORT_OFFSET, DESTINATION_PORT_LENGTH, REP_BIG_ENDIAN);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
|
|
if (tvb_bytes_exist(tvb, 0, reported_length)) {
|
|
/* We have the whole packet */
|
|
|
|
switch(sctp_checksum) {
|
|
case SCTP_CHECKSUM_NONE:
|
|
proto_tree_add_uint_format(sctp_tree, hf_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, checksum, "Checksum: 0x%08x (not verified)", checksum);
|
|
break;
|
|
case SCTP_CHECKSUM_ADLER32:
|
|
if (adler32_correct)
|
|
proto_tree_add_uint_format(sctp_tree, hf_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
|
|
checksum, "Checksum: 0x%08x [correct Adler32]", checksum);
|
|
else
|
|
proto_tree_add_uint_format(sctp_tree, hf_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
|
|
checksum, "Checksum: 0x%08x [incorrect Adler32, should be 0x%08x]", checksum, calculated_adler32);
|
|
hidden_item = proto_tree_add_boolean(sctp_tree, hf_checksum_bad, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, !(adler32_correct));
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
break;
|
|
case SCTP_CHECKSUM_CRC32C:
|
|
if (crc32c_correct)
|
|
proto_tree_add_uint_format(sctp_tree, hf_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
|
|
checksum, "Checksum: 0x%08x [correct CRC32C]", checksum);
|
|
else
|
|
proto_tree_add_uint_format(sctp_tree, hf_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
|
|
checksum, "Checksum: 0x%08x [incorrect CRC32C, should be 0x%08x]", checksum, calculated_crc32c);
|
|
hidden_item = proto_tree_add_boolean(sctp_tree, hf_checksum_bad, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, !(crc32c_correct));
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
break;
|
|
case SCTP_CHECKSUM_AUTOMATIC:
|
|
if ((adler32_correct) && !(crc32c_correct))
|
|
proto_tree_add_uint_format(sctp_tree, hf_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
|
|
checksum, "Checksum: 0x%08x [correct Adler32]", checksum);
|
|
else if ((!adler32_correct) && (crc32c_correct))
|
|
proto_tree_add_uint_format(sctp_tree, hf_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
|
|
checksum, "Checksum: 0x%08x [correct CRC32C]", checksum);
|
|
else if ((adler32_correct) && (crc32c_correct))
|
|
proto_tree_add_uint_format(sctp_tree, hf_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
|
|
checksum, "Checksum: 0x%08x [correct Adler32 and CRC32C]", checksum);
|
|
else
|
|
proto_tree_add_uint_format(sctp_tree, hf_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
|
|
checksum, "Checksum: 0x%08x [incorrect, should be 0x%08x (Adler32) or 0x%08x (CRC32C)]",
|
|
checksum, calculated_adler32, calculated_crc32c);
|
|
hidden_item = proto_tree_add_boolean(sctp_tree, hf_checksum_bad, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH, !(crc32c_correct || adler32_correct));
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
break;
|
|
}
|
|
} else {
|
|
/* We don't have the whole packet so we can't verify the checksum */
|
|
proto_tree_add_uint_format(sctp_tree, hf_checksum, tvb, CHECKSUM_OFFSET, CHECKSUM_LENGTH,
|
|
checksum, "Checksum: 0x%08x [unchecked, not all data available]", checksum);
|
|
}
|
|
} else {
|
|
sctp_tree = NULL;
|
|
sctp_item = NULL;
|
|
}
|
|
|
|
/* add all chunks of the sctp datagram to the protocol tree */
|
|
dissect_sctp_chunks(tvb, pinfo, tree, sctp_item, sctp_tree, ha, encapsulated);
|
|
}
|
|
|
|
static void
|
|
dissect_sctp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
guint16 source_port, destination_port;
|
|
|
|
/* Extract the common header */
|
|
source_port = tvb_get_ntohs(tvb, SOURCE_PORT_OFFSET);
|
|
destination_port = tvb_get_ntohs(tvb, DESTINATION_PORT_OFFSET);
|
|
|
|
/* update pi structure */
|
|
pinfo->ptype = PT_SCTP;
|
|
pinfo->srcport = source_port;
|
|
pinfo->destport = destination_port;
|
|
|
|
/* make entry in the Protocol column on summary display */
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "SCTP");
|
|
|
|
/* Clear entries in Info column on summary display */
|
|
col_set_str(pinfo->cinfo, COL_INFO, "");
|
|
|
|
memset(&pinfo->ppids, 0, sizeof(pinfo->ppids));
|
|
|
|
/* The tvb array in struct _sctp_info is huge: currently 2k pointers.
|
|
* We know (by the value of 'number_of_tvbs') which of these entries have
|
|
* been used, so don't memset() the array. This saves us from zeroing out
|
|
* 8k (4-byte pointers) or 16k (8-byte pointers) of memory every time we
|
|
* dissect a packet (saving quite a bit of time!).
|
|
*/
|
|
sctp_info.incomplete = 0;
|
|
sctp_info.adler32_calculated = 0;
|
|
sctp_info.adler32_correct = 0;
|
|
sctp_info.crc32c_calculated = 0;
|
|
sctp_info.crc32c_correct = 0;
|
|
sctp_info.vtag_reflected = 0;
|
|
sctp_info.number_of_tvbs = 0;
|
|
sctp_info.verification_tag = tvb_get_ntohl(tvb, VERIFICATION_TAG_OFFSET);
|
|
|
|
sctp_info.sport = pinfo->srcport;
|
|
sctp_info.dport = pinfo->destport;
|
|
SET_ADDRESS(&sctp_info.ip_src, pinfo->src.type, pinfo->src.len, pinfo->src.data);
|
|
SET_ADDRESS(&sctp_info.ip_dst, pinfo->dst.type, pinfo->dst.len, pinfo->dst.data);
|
|
|
|
dissect_sctp_packet(tvb, pinfo, tree, FALSE);
|
|
if (!pinfo->in_error_pkt)
|
|
tap_queue_packet(sctp_tap, pinfo, &sctp_info);
|
|
}
|
|
|
|
/* Register the protocol with Wireshark */
|
|
void
|
|
proto_register_sctp(void)
|
|
{
|
|
|
|
/* Setup list of header fields */
|
|
static hf_register_info hf[] = {
|
|
{ &hf_source_port, { "Source port", "sctp.srcport", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_destination_port, { "Destination port", "sctp.dstport", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_port, { "Port", "sctp.port", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_verification_tag, { "Verification tag", "sctp.verification_tag", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_checksum, { "Checksum", "sctp.checksum", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_checksum_bad, { "Bad checksum", "sctp.checksum_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_chunk_type, { "Chunk type", "sctp.chunk_type", FT_UINT8, BASE_DEC, VALS(chunk_type_values), 0x0, NULL, HFILL } },
|
|
{ &hf_chunk_flags, { "Chunk flags", "sctp.chunk_flags", FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_chunk_bit_1, { "Bit", "sctp.chunk_bit_1", FT_BOOLEAN, 8, TFS(&sctp_chunk_bit_1_value), SCTP_CHUNK_BIT_1, NULL, HFILL } },
|
|
{ &hf_chunk_bit_2, { "Bit", "sctp.chunk_bit_2", FT_BOOLEAN, 8, TFS(&sctp_chunk_bit_2_value), SCTP_CHUNK_BIT_2, NULL, HFILL } },
|
|
{ &hf_chunk_length, { "Chunk length", "sctp.chunk_length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_chunk_padding, { "Chunk padding", "sctp.chunk_padding", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_chunk_value, { "Chunk value", "sctp.chunk_value", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_cookie, { "Cookie", "sctp.cookie", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_initiate_tag, { "Initiate tag", "sctp.initiate_tag", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_init_chunk_initiate_tag, { "Initiate tag", "sctp.init_initiate_tag", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_init_chunk_adv_rec_window_credit, { "Advertised receiver window credit (a_rwnd)", "sctp.init_credit", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_init_chunk_number_of_outbound_streams, { "Number of outbound streams", "sctp.init_nr_out_streams", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_init_chunk_number_of_inbound_streams, { "Number of inbound streams", "sctp.init_nr_in_streams", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_init_chunk_initial_tsn, { "Initial TSN", "sctp.init_initial_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_initack_chunk_initiate_tag, { "Initiate tag", "sctp.initack_initiate_tag", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_initack_chunk_adv_rec_window_credit, { "Advertised receiver window credit (a_rwnd)", "sctp.initack_credit", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_initack_chunk_number_of_outbound_streams, { "Number of outbound streams", "sctp.initack_nr_out_streams", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_initack_chunk_number_of_inbound_streams, { "Number of inbound streams", "sctp.initack_nr_in_streams", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_initack_chunk_initial_tsn, { "Initial TSN", "sctp.initack_initial_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_cumulative_tsn_ack, { "Cumulative TSN Ack", "sctp.cumulative_tsn_ack", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_data_chunk_tsn, { "TSN", "sctp.data_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_data_chunk_stream_id, { "Stream Identifier", "sctp.data_sid", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_data_chunk_stream_seq_number, { "Stream sequence number", "sctp.data_ssn", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_data_chunk_payload_proto_id, { "Payload protocol identifier", "sctp.data_payload_proto_id", FT_UINT32, BASE_DEC, VALS(sctp_payload_proto_id_values), 0x0, NULL, HFILL } },
|
|
{ &hf_data_chunk_e_bit, { "E-Bit", "sctp.data_e_bit", FT_BOOLEAN, 8, TFS(&sctp_data_chunk_e_bit_value), SCTP_DATA_CHUNK_E_BIT, NULL, HFILL } },
|
|
{ &hf_data_chunk_b_bit, { "B-Bit", "sctp.data_b_bit", FT_BOOLEAN, 8, TFS(&sctp_data_chunk_b_bit_value), SCTP_DATA_CHUNK_B_BIT, NULL, HFILL } },
|
|
{ &hf_data_chunk_u_bit, { "U-Bit", "sctp.data_u_bit", FT_BOOLEAN, 8, TFS(&sctp_data_chunk_u_bit_value), SCTP_DATA_CHUNK_U_BIT, NULL, HFILL } },
|
|
{ &hf_data_chunk_i_bit, { "I-Bit", "sctp.data_i_bit", FT_BOOLEAN, 8, TFS(&sctp_data_chunk_i_bit_value), SCTP_DATA_CHUNK_I_BIT, NULL, HFILL } },
|
|
{ &hf_sack_chunk_ns, { "Nounce sum", "sctp.sack_nounce_sum", FT_UINT8, BASE_DEC, NULL, SCTP_SACK_CHUNK_NS_BIT, NULL, HFILL } },
|
|
{ &hf_sack_chunk_cumulative_tsn_ack, { "Cumulative TSN ACK", "sctp.sack_cumulative_tsn_ack", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sack_chunk_adv_rec_window_credit, { "Advertised receiver window credit (a_rwnd)", "sctp.sack_a_rwnd", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sack_chunk_number_of_gap_blocks, { "Number of gap acknowledgement blocks", "sctp.sack_number_of_gap_blocks", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sack_chunk_number_of_dup_tsns, { "Number of duplicated TSNs", "sctp.sack_number_of_duplicated_tsns", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sack_chunk_gap_block_start, { "Start", "sctp.sack_gap_block_start", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sack_chunk_gap_block_start_tsn, { "Start TSN", "sctp.sack_gap_block_start_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sack_chunk_gap_block_end, { "End", "sctp.sack_gap_block_end", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sack_chunk_gap_block_end_tsn, { "End TSN", "sctp.sack_gap_block_end_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sack_chunk_number_tsns_gap_acked, { "Number of TSNs in gap acknowledgement blocks", "sctp.sack_number_of_tsns_gap_acked", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sack_chunk_duplicate_tsn, { "Duplicate TSN", "sctp.sack_duplicate_tsn", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_ns, { "Nounce sum", "sctp.nr_sack_nounce_sum", FT_UINT8, BASE_DEC, NULL, SCTP_NR_SACK_CHUNK_NS_BIT, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_cumulative_tsn_ack, { "Cumulative TSN ACK", "sctp.nr_sack_cumulative_tsn_ack", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_adv_rec_window_credit, { "Advertised receiver window credit (a_rwnd)", "sctp.nr_sack_a_rwnd", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_number_of_gap_blocks, { "Number of gap acknowledgement blocks", "sctp.nr_sack_number_of_gap_blocks", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_number_of_nr_gap_blocks, { "Number of nr-gap acknowledgement blocks", "sctp.nr_sack_number_of_nr_gap_blocks", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_number_of_dup_tsns, { "Number of duplicated TSNs", "sctp.nr_sack_number_of_duplicated_tsns", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_reserved, { "Reserved", "sctp.nr_sack_reserved", FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_gap_block_start, { "Start", "sctp.nr_sack_gap_block_start", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_gap_block_start_tsn, { "Start TSN", "sctp.nr_sack_gap_block_start_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_gap_block_end, { "End", "sctp.nr_sack_gap_block_end", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_gap_block_end_tsn, { "End TSN", "sctp.nr_sack_gap_block_end_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_number_tsns_gap_acked, { "Number of TSNs in gap acknowledgement blocks", "sctp.nr_sack_number_of_tsns_gap_acked", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_nr_gap_block_start, { "Start", "sctp.nr_sack_nr_gap_block_start", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_nr_gap_block_start_tsn, { "Start TSN", "sctp.nr_sack_nr_gap_block_start_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_nr_gap_block_end, { "End", "sctp.nr_sack_nr_gap_block_end", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_nr_gap_block_end_tsn, { "End TSN", "sctp.nr_sack_nr_gap_block_end_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_number_tsns_nr_gap_acked, { "Number of TSNs in nr-gap acknowledgement blocks","sctp.nr_sack_number_of_tsns_nr_gap_acked", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_nr_sack_chunk_duplicate_tsn, { "Duplicate TSN", "sctp.nr_sack_duplicate_tsn", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_shutdown_chunk_cumulative_tsn_ack, { "Cumulative TSN Ack", "sctp.shutdown_cumulative_tsn_ack", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_ecne_chunk_lowest_tsn, { "Lowest TSN", "sctp.ecne_lowest_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_cwr_chunk_lowest_tsn, { "Lowest TSN", "sctp.cwr_lowest_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_shutdown_complete_chunk_t_bit, { "T-Bit", "sctp.shutdown_complete_t_bit", FT_BOOLEAN, 8, TFS(&sctp_shutdown_complete_chunk_t_bit_value), SCTP_SHUTDOWN_COMPLETE_CHUNK_T_BIT, NULL, HFILL } },
|
|
{ &hf_abort_chunk_t_bit, { "T-Bit", "sctp.abort_t_bit", FT_BOOLEAN, 8, TFS(&sctp_shutdown_complete_chunk_t_bit_value), SCTP_ABORT_CHUNK_T_BIT, NULL, HFILL } },
|
|
{ &hf_forward_tsn_chunk_tsn, { "New cumulative TSN", "sctp.forward_tsn_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_forward_tsn_chunk_sid, { "Stream identifier", "sctp.forward_tsn_sid", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_forward_tsn_chunk_ssn, { "Stream sequence number", "sctp.forward_tsn_ssn", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_parameter_type, { "Parameter type", "sctp.parameter_type", FT_UINT16, BASE_HEX, VALS(parameter_identifier_values), 0x0, NULL, HFILL } },
|
|
{ &hf_parameter_length, { "Parameter length", "sctp.parameter_length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_parameter_value, { "Parameter value", "sctp.parameter_value", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_parameter_padding, { "Parameter padding", "sctp.parameter_padding", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_parameter_bit_1, { "Bit", "sctp.parameter_bit_1", FT_BOOLEAN, 16, TFS(&sctp_parameter_bit_1_value), SCTP_PARAMETER_BIT_1, NULL, HFILL } },
|
|
{ &hf_parameter_bit_2, { "Bit", "sctp.parameter_bit_2", FT_BOOLEAN, 16, TFS(&sctp_parameter_bit_2_value), SCTP_PARAMETER_BIT_2, NULL, HFILL } },
|
|
{ &hf_ipv4_address, { "IP Version 4 address", "sctp.parameter_ipv4_address", FT_IPv4, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_ipv6_address, { "IP Version 6 address", "sctp.parameter_ipv6_address", FT_IPv6, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_heartbeat_info, { "Heartbeat information", "sctp.parameter_heartbeat_information", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_state_cookie, { "State cookie", "sctp.parameter_state_cookie", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_cookie_preservative_increment, { "Suggested Cookie life-span increment (msec)", "sctp.parameter_cookie_preservative_incr", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_hostname, { "Hostname", "sctp.parameter_hostname", FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_supported_address_type, { "Supported address type", "sctp.parameter_supported_addres_type", FT_UINT16, BASE_DEC, VALS(address_types_values), 0x0, NULL, HFILL } },
|
|
{ &hf_stream_reset_req_seq_nr, { "Stream reset request sequence number", "sctp.parameter_stream_reset_request_sequence_number", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_stream_reset_rsp_seq_nr, { "Stream reset response sequence number", "sctp.parameter_stream_reset_response_sequence_number", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_senders_last_assigned_tsn, { "Senders last assigned TSN", "sctp.parameter_senders_last_assigned_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_senders_next_tsn, { "Senders next TSN", "sctp.parameter_senders_next_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_receivers_next_tsn, { "Receivers next TSN", "sctp.parameter_receivers_next_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_stream_reset_rsp_result, { "Result", "sctp.parameter_stream_reset_response_result", FT_UINT32, BASE_DEC, VALS(stream_reset_result_values), 0x0, NULL, HFILL } },
|
|
{ &hf_stream_reset_sid, { "Stream Identifier", "sctp.parameter_stream_reset_sid", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_asconf_serial, { "Serial number", "sctp.asconf_serial_number", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_asconf_ack_serial, { "Serial number", "sctp.asconf_ack_serial_number", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_correlation_id, { "Correlation_id", "sctp.correlation_id", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_adap_indication, { "Indication", "sctp.adapation_layer_indication", FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_random_number, { "Random number", "sctp.random_number", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_chunks_to_auth, { "Chunk type", "sctp.chunk_type_to_auth", FT_UINT8, BASE_DEC, VALS(chunk_type_values), 0x0, NULL, HFILL } },
|
|
{ &hf_hmac_id, { "HMAC identifier", "sctp.hmac_id", FT_UINT16, BASE_DEC, VALS(hmac_id_values), 0x0, NULL, HFILL } },
|
|
{ &hf_hmac, { "HMAC", "sctp.hmac", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_shared_key_id, { "Shared key identifier", "sctp.shared_key_id", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_supported_chunk_type, { "Supported chunk type", "sctp.supported_chunk_type", FT_UINT8, BASE_DEC, VALS(chunk_type_values), 0x0, NULL, HFILL } },
|
|
{ &hf_cause_code, { "Cause code", "sctp.cause_code", FT_UINT16, BASE_HEX, VALS(cause_code_values), 0x0, NULL, HFILL } },
|
|
{ &hf_cause_length, { "Cause length", "sctp.cause_length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_cause_info, { "Cause information", "sctp.cause_information", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_cause_padding, { "Cause padding", "sctp.cause_padding", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_cause_stream_identifier, { "Stream identifier", "sctp.cause_stream_identifier", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_cause_reserved, { "Reserved", "sctp.cause_reserved", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_cause_number_of_missing_parameters, { "Number of missing parameters", "sctp.cause_nr_of_missing_parameters", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_cause_missing_parameter_type, { "Missing parameter type", "sctp.cause_missing_parameter_type", FT_UINT16, BASE_HEX, VALS(parameter_identifier_values), 0x0, NULL, HFILL } },
|
|
{ &hf_cause_measure_of_staleness, { "Measure of staleness in usec", "sctp.cause_measure_of_staleness", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_cause_tsn, { "TSN", "sctp.cause_tsn", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_pktdrop_chunk_m_bit, { "M-Bit", "sctp.pckdrop_m_bit", FT_BOOLEAN, 8, TFS(&sctp_pktdropk_m_bit_value), SCTP_PKTDROP_CHUNK_M_BIT, NULL, HFILL } },
|
|
{ &hf_pktdrop_chunk_b_bit, { "B-Bit", "sctp.pckdrop_b_bit", FT_BOOLEAN, 8, TFS(&sctp_pktdropk_b_bit_value), SCTP_PKTDROP_CHUNK_B_BIT, NULL, HFILL } },
|
|
{ &hf_pktdrop_chunk_t_bit, { "T-Bit", "sctp.pckdrop_t_bit", FT_BOOLEAN, 8, TFS(&sctp_pktdropk_t_bit_value), SCTP_PKTDROP_CHUNK_T_BIT, NULL, HFILL } },
|
|
{ &hf_pktdrop_chunk_bandwidth, { "Bandwidth", "sctp.pktdrop_bandwidth", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_pktdrop_chunk_queuesize, { "Queuesize", "sctp.pktdrop_queuesize", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_pktdrop_chunk_truncated_length, { "Truncated length", "sctp.pktdrop_truncated_length", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_pktdrop_chunk_reserved, { "Reserved", "sctp.pktdrop_reserved", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_pktdrop_chunk_data_field, { "Data field", "sctp.pktdrop_datafield", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
|
|
{ &hf_sctp_fragment, { "SCTP Fragment", "sctp.fragment", FT_FRAMENUM, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sctp_fragments, { "Reassembled SCTP Fragments", "sctp.fragments", FT_NONE, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sctp_reassembled_in, { "Reassembled Message in frame", "sctp.reassembled_in", FT_FRAMENUM, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sctp_duplicate, { "Fragment already seen in frame", "sctp.duplicate", FT_FRAMENUM, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
|
|
{ &hf_sctp_rtt, { "The RTT to ACK the chunk was", "sctp.rtt", FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sctp_rto, { "Retransmitted after", "sctp.retransmission_time", FT_RELATIVE_TIME, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sctp_retransmission, { "This TSN is a retransmission of one in frame", "sctp.retransmission", FT_FRAMENUM, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sctp_retransmitted, { "This TSN is retransmitted in frame", "sctp.retransmitted", FT_FRAMENUM, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sctp_retransmitted_count, { "TSN was retransmitted this many times", "sctp.retransmitted_count", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sctp_acked, { "This chunk is acked in frame", "sctp.acked", FT_FRAMENUM, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sctp_ack_tsn, { "Acknowledges TSN", "sctp.ack", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sctp_ack_frame, { "Chunk acknowledged in frame", "sctp.ack_frame", FT_FRAMENUM, BASE_NONE, NULL, 0x0, NULL, HFILL } },
|
|
{ &hf_sctp_retransmitted_after_ack, { "Chunk was acked prior to retransmission", "sctp.retransmitted_after_ack", FT_FRAMENUM, BASE_NONE, NULL, 0x0, NULL, HFILL } }
|
|
|
|
};
|
|
|
|
/* Setup protocol subtree array */
|
|
static gint *ett[] = {
|
|
&ett_sctp,
|
|
&ett_sctp_chunk,
|
|
&ett_sctp_chunk_parameter,
|
|
&ett_sctp_chunk_cause,
|
|
&ett_sctp_chunk_type,
|
|
&ett_sctp_data_chunk_flags,
|
|
&ett_sctp_sack_chunk_flags,
|
|
&ett_sctp_nr_sack_chunk_flags,
|
|
&ett_sctp_abort_chunk_flags,
|
|
&ett_sctp_shutdown_complete_chunk_flags,
|
|
&ett_sctp_pktdrop_chunk_flags,
|
|
&ett_sctp_parameter_type,
|
|
&ett_sctp_sack_chunk_gap_block,
|
|
&ett_sctp_sack_chunk_gap_block_start,
|
|
&ett_sctp_sack_chunk_gap_block_end,
|
|
&ett_sctp_nr_sack_chunk_gap_block,
|
|
&ett_sctp_nr_sack_chunk_gap_block_start,
|
|
&ett_sctp_nr_sack_chunk_gap_block_end,
|
|
&ett_sctp_nr_sack_chunk_nr_gap_block,
|
|
&ett_sctp_nr_sack_chunk_nr_gap_block_start,
|
|
&ett_sctp_nr_sack_chunk_nr_gap_block_end,
|
|
&ett_sctp_unrecognized_parameter_parameter,
|
|
&ett_sctp_fragments,
|
|
&ett_sctp_fragment,
|
|
&ett_sctp_ack,
|
|
&ett_sctp_acked,
|
|
&ett_sctp_tsn,
|
|
&ett_sctp_tsn_retransmission,
|
|
&ett_sctp_tsn_retransmitted_count,
|
|
&ett_sctp_tsn_retransmitted
|
|
};
|
|
|
|
static enum_val_t sctp_checksum_options[] = {
|
|
{ "none", "None", SCTP_CHECKSUM_NONE },
|
|
{ "adler-32", "Adler 32", SCTP_CHECKSUM_ADLER32 },
|
|
{ "crc-32c", "CRC 32c", SCTP_CHECKSUM_CRC32C },
|
|
{ "automatic", "Automatic", SCTP_CHECKSUM_AUTOMATIC},
|
|
{ NULL, NULL, 0 }
|
|
};
|
|
|
|
/* Register the protocol name and description */
|
|
proto_sctp = proto_register_protocol("Stream Control Transmission Protocol", "SCTP", "sctp");
|
|
sctp_module = prefs_register_protocol(proto_sctp, NULL);
|
|
prefs_register_bool_preference(sctp_module, "show_port_numbers_in_tree",
|
|
"Show port numbers in the protocol tree",
|
|
"Show source and destination port numbers in the protocol tree",
|
|
&show_port_numbers);
|
|
/* FIXME
|
|
prefs_register_bool_preference(sctp_module, "show_chunk_types_in_tree",
|
|
"Show chunk types in the protocol tree",
|
|
"Show chunk types in the protocol tree",
|
|
&show_chunk_types);
|
|
*/
|
|
prefs_register_enum_preference(sctp_module, "checksum", "Checksum type",
|
|
"The type of checksum used in SCTP packets",
|
|
&sctp_checksum, sctp_checksum_options, FALSE);
|
|
prefs_register_bool_preference(sctp_module, "show_always_control_chunks",
|
|
"Show always control chunks",
|
|
"Show always SCTP control chunks in the Info column",
|
|
&show_always_control_chunks);
|
|
prefs_register_bool_preference(sctp_module, "try_heuristic_first",
|
|
"Try heuristic sub-dissectors first",
|
|
"Try to decode a packet using an heuristic sub-dissector before using a sub-dissector registered to a specific port or PPI",
|
|
&try_heuristic_first);
|
|
prefs_register_bool_preference(sctp_module, "reassembly",
|
|
"Reassemble fragmented SCTP user messages",
|
|
"Whether fragmented SCTP user messages should be reassembled",
|
|
&use_reassembly);
|
|
prefs_register_bool_preference(sctp_module, "tsn_analysis",
|
|
"Enable TSN analysis",
|
|
"Match TSNs and their SACKs",
|
|
&enable_tsn_analysis);
|
|
prefs_register_bool_preference(sctp_module, "ulp_dissection",
|
|
"Dissect upper layer protocols",
|
|
"Dissect upper layer protocols",
|
|
&enable_ulp_dissection);
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
proto_register_field_array(proto_sctp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
sctp_tap = register_tap("sctp");
|
|
/* subdissector code */
|
|
sctp_port_dissector_table = register_dissector_table("sctp.port", "SCTP port", FT_UINT16, BASE_DEC);
|
|
sctp_ppi_dissector_table = register_dissector_table("sctp.ppi", "SCTP payload protocol identifier", FT_UINT32, BASE_HEX);
|
|
|
|
register_dissector("sctp", dissect_sctp, proto_sctp);
|
|
register_heur_dissector_list("sctp", &sctp_heur_subdissector_list);
|
|
|
|
register_init_routine(frag_table_init);
|
|
|
|
dirs_by_ptvtag = se_tree_create(EMEM_TREE_TYPE_RED_BLACK, "sctp_dirs_by_ptvtag");
|
|
dirs_by_ptaddr = se_tree_create(EMEM_TREE_TYPE_RED_BLACK, "sctp_dirs_by_ptaddr");
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_sctp(void)
|
|
{
|
|
dissector_handle_t sctp_handle;
|
|
|
|
data_handle = find_dissector("data");
|
|
sctp_handle = find_dissector("sctp");
|
|
dissector_add("ip.proto", IP_PROTO_SCTP, sctp_handle);
|
|
dissector_add("udp.port", UDP_TUNNELING_PORT, sctp_handle);
|
|
}
|