forked from osmocom/wireshark
1752 lines
64 KiB
C
1752 lines
64 KiB
C
/* packet-dccp.c
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* Routines for Datagram Congestion Control Protocol, "DCCP" dissection:
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* it should conform to RFC 4340
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*
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* Copyright 2005 _FF_
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*
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* Francesco Fondelli <francesco dot fondelli, gmail dot com>
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*
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* Copyright 2020-2021 by Thomas Dreibholz <dreibh [AT] simula.no>
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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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* Copied from packet-udp.c
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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/* NOTES:
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*
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* Nov 13, 2006: makes checksum computation dependent
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* upon the header CsCov field (cf. RFC 4340, 5.1)
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* (Gerrit Renker)
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*
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* Nov 13, 2006: removes the case where checksums are zero
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* (unlike UDP/packet-udp, from which the code stems,
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* zero checksums are illegal in DCCP (as in TCP))
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* (Gerrit Renker)
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*
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* Jan 29, 2007: updates the offsets of the timestamps to be
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* compliant to (cf. RFC 4342, sec. 13).
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* (Gerrit Renker)
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*
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* Mar 11, 2012: add support for RFC 5596 (DCCP-Listen Packet)
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* (Francesco Fondelli)
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*
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* Feb 19, 2021: added service code types
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* (Thomas Dreibholz)
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/addr_resolv.h>
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#include <epan/dccpservicecodes.h>
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#include <epan/ipproto.h>
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#include <epan/in_cksum.h>
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#include <epan/prefs.h>
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#include <epan/follow.h>
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#include <epan/expert.h>
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#include <epan/conversation.h>
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#include <epan/conversation_table.h>
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#include <epan/conversation_filter.h>
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#include <epan/exported_pdu.h>
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#include <epan/tap.h>
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#include <wsutil/str_util.h>
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#include <wsutil/utf8_entities.h>
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#include "packet-dccp.h"
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/*
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* Some definitions and the dissect_options() logic have been taken
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* from Arnaldo Carvalho de Melo's DCCP implementation, thanks!
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*/
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#define DCCP_GEN_HDR_LEN_NO_X 12 /* generic header length, without extended sequence numbers */
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#define DCCP_GEN_HDR_LEN_X 16 /* generic header length, with extended sequence numbers */
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#define DCCP_HDR_LEN 16 /* base DCCP header length, with 48 bits seqnums */
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#define DCCP_HDR_LEN_MIN 12 /* with 24 bits seqnum */
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#define DCCP_HDR_PKT_TYPES_LEN_MAX 12 /* max per packet type extra
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* header length
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*/
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#define DCCP_OPT_LEN_MAX 1008
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#define DCCP_HDR_LEN_MAX (DCCP_HDR_LEN + DCCP_HDR_PKT_TYPES_LEN_MAX + \
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DCCP_OPT_LEN_MAX)
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/* Static DCCP flags. Set in dccp_flow_t:static_flags */
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#define DCCP_S_BASE_SEQ_SET 0x01
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void proto_register_dccp(void);
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void proto_reg_handoff_dccp(void);
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/*
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* FF: please keep this list in sync with
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* http://www.iana.org/assignments/dccp-parameters/dccp-parameters.xml
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* Registry Name: 'Packet Types'
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*/
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static const value_string dccp_packet_type_vals[] = {
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{0x0, "Request" },
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{0x1, "Response"},
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{0x2, "Data" },
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{0x3, "Ack" },
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{0x4, "DataAck" },
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{0x5, "CloseReq"},
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{0x6, "Close" },
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{0x7, "Reset" },
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{0x8, "Sync" },
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{0x9, "SyncAck" },
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{0xA, "Listen" },
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{0xB, "Reserved"},
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{0xC, "Reserved"},
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{0xD, "Reserved"},
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{0xE, "Reserved"},
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{0xF, "Reserved"},
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{0, NULL }
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};
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/*
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* Based on https://www.iana.org/assignments/service-codes/service-codes.xhtml
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* as of February 19th, 2021
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*/
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static const value_string dccp_service_code_vals[] = {
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{ NOT_SPECIFIED_SERVICE_CODE, "not specified" },
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{ LTP_SERVICE_CODE, "LTP: Licklider Transmission Protocol" },
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{ DISC_SERVICE_CODE, "DISC: Discard" },
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{ RTCP_SERVICE_CODE, "RTCP: RTCP connection, separate from the corresponding RTP" },
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{ RTPA_SERVICE_CODE, "RTPA: RTP session conveying audio data (and associated RTCP)" },
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{ RTPO_SERVICE_CODE, "RTPO: RTP session conveying other media (and associated RTCP)" },
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{ RTPT_SERVICE_CODE, "RTPT: RTP session conveying text media (and associated RTCP)" },
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{ RTPV_SERVICE_CODE, "RTPV: RTP session conveying video data (and associated RTCP)" },
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{ SYLG_SERVICE_CODE, "SYLG: Syslog Protocol" },
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{ BUNDLES_SERVICE_CODE, "Bundle Protocol" },
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{ NPMP_SERVICE_CODE, "NPMP: NetPerfMeter Data" },
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{ RESERVED_SERVICE_CODE, "Reserved (Invalid)" },
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{ 0, NULL } };
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static const value_string dccp_reset_code_vals[] = {
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{0x00, "Unspecified" },
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{0x01, "Closed" },
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{0x02, "Aborted" },
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{0x03, "No Connection" },
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{0x04, "Packet Error" },
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{0x05, "Option Error" },
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{0x06, "Mandatory Error" },
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{0x07, "Connection Refused"},
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{0x08, "Bad Service Code" },
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{0x09, "Too Busy" },
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{0x0A, "Bad Init Cookie" },
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{0x0B, "Aggression Penalty"},
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{0x0C, "Reserved" },
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{0, NULL }
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};
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static const range_string dccp_options_rvals[] = {
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{0x00, 0x00, "Padding" },
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{0x01, 0x01, "Mandatory" },
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{0x02, 0x02, "Slow Receiver" },
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{0x03, 0x1F, "Reserved"},
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{0x20, 0x20, "Change L" },
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{0x21, 0x21, "Confirm L"},
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{0x22, 0x22, "Change R" },
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{0x23, 0x23, "Confirm R"},
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{0x24, 0x24, "Init Cookie"},
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{0x25, 0x25, "NDP Count"},
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{0x26, 0x26, "Ack Vector [Nonce 0]"},
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{0x27, 0x27, "Ack Vector [Nonce 1]"},
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{0x28, 0x28, "Data Dropped"},
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{0x29, 0x29, "Timestamp"},
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{0x2A, 0x2A, "Timestamp Echo"},
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{0x2B, 0x2B, "Elapsed Time"},
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{0x2C, 0x2C, "Data checksum"},
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{0x2D, 0x7F, "Reserved"},
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{0x80, 0xBF, "CCID option"},
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{0xC0, 0xC0, "CCID3 Loss Event Rate"},
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{0xC1, 0xC1, "CCID3 Loss Intervals"},
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{0xC2, 0xC2, "CCID3 Receive Rate"},
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{0xC3, 0xFF, "CCID option"},
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{0, 0, NULL}
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};
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static const range_string dccp_feature_numbers_rvals[] = {
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{0x00, 0x00, "Reserved" },
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{0x01, 0x01, "Congestion Control ID (CCID)" },
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{0x02, 0x02, "Allow Short Seqnums" },
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{0x03, 0x03, "Sequence Window" },
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{0x04, 0x04, "ECN Incapable" },
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{0x05, 0x05, "Ack Ratio" },
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{0x06, 0x06, "Send Ack Vector" },
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{0x07, 0x07, "Send NDP Count" },
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{0x08, 0x08, "Minimum Checksum Coverage" },
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{0x09, 0x09, "Check Data Checksum" },
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{0x03, 0x7F, "Reserved"},
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{0xC0, 0xC0, "Send Loss Event Rate"}, /* CCID3, RFC 4342, 8.5 */
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{0xC1, 0xFF, "CCID-specific feature"},
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{0, 0, NULL}
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};
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static const unit_name_string units_bytes_sec = { "bytes/sec", NULL };
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static int proto_dccp = -1;
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static int dccp_tap = -1;
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static int dccp_follow_tap = -1;
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static int hf_dccp_srcport = -1;
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static int hf_dccp_dstport = -1;
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static int hf_dccp_port = -1;
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static int hf_dccp_stream = -1;
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static int hf_dccp_data_offset = -1;
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static int hf_dccp_ccval = -1;
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static int hf_dccp_cscov = -1;
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static int hf_dccp_checksum = -1;
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static int hf_dccp_checksum_status = -1;
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static int hf_dccp_res1 = -1;
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static int hf_dccp_type = -1;
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static int hf_dccp_x = -1;
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static int hf_dccp_res2 = -1;
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static int hf_dccp_seq = -1;
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static int hf_dccp_seq_abs = -1;
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static int hf_dccp_ack_res = -1;
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static int hf_dccp_ack = -1;
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static int hf_dccp_ack_abs = -1;
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static int hf_dccp_service_code = -1;
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static int hf_dccp_reset_code = -1;
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static int hf_dccp_data1 = -1;
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static int hf_dccp_data2 = -1;
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static int hf_dccp_data3 = -1;
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static int hf_dccp_options = -1;
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static int hf_dccp_option_type = -1;
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static int hf_dccp_feature_number = -1;
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static int hf_dccp_ndp_count = -1;
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static int hf_dccp_timestamp = -1;
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static int hf_dccp_timestamp_echo = -1;
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static int hf_dccp_elapsed_time = -1;
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static int hf_dccp_data_checksum = -1;
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/* Generated from convert_proto_tree_add_text.pl */
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static int hf_dccp_padding = -1;
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static int hf_dccp_mandatory = -1;
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static int hf_dccp_slow_receiver = -1;
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static int hf_dccp_init_cookie = -1;
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static int hf_dccp_ack_vector_nonce_0 = -1;
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static int hf_dccp_ack_vector_nonce_1 = -1;
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static int hf_dccp_data_dropped = -1;
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static int hf_dccp_ccid3_loss_event_rate = -1;
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static int hf_dccp_ccid3_loss_intervals = -1;
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static int hf_dccp_ccid3_receive_rate = -1;
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static int hf_dccp_option_reserved = -1;
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static int hf_dccp_ccid_option_data = -1;
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static int hf_dccp_option_unknown = -1;
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static gint ett_dccp = -1;
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static gint ett_dccp_options = -1;
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static gint ett_dccp_options_item = -1;
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static gint ett_dccp_feature = -1;
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static expert_field ei_dccp_option_len_bad = EI_INIT;
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static expert_field ei_dccp_advertised_header_length_bad = EI_INIT;
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static expert_field ei_dccp_packet_type_reserved = EI_INIT;
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static expert_field ei_dccp_checksum = EI_INIT;
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static dissector_table_t dccp_subdissector_table;
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static heur_dissector_list_t heur_subdissector_list;
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/* preferences */
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static gboolean dccp_summary_in_tree = TRUE;
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static gboolean try_heuristic_first = FALSE;
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static gboolean dccp_check_checksum = TRUE;
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static gboolean dccp_relative_seq = TRUE;
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static guint32 dccp_stream_count;
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static void
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decode_dccp_ports(tvbuff_t *tvb, int offset, packet_info *pinfo,
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proto_tree *tree, int sport, int dport)
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{
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tvbuff_t *next_tvb;
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int low_port, high_port;
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heur_dtbl_entry_t *hdtbl_entry;
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next_tvb = tvb_new_subset_remaining(tvb, offset);
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/* If the user has a "Follow DCCP Stream" window loading, pass a pointer
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to the payload tvb through the tap system. */
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if (have_tap_listener(dccp_follow_tap))
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tap_queue_packet(dccp_follow_tap, pinfo, next_tvb);
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/*
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* determine if this packet is part of a conversation and call dissector
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* for the conversation if available
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*/
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if (try_conversation_dissector(&pinfo->src, &pinfo->dst, ENDPOINT_DCCP, sport,
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dport, next_tvb, pinfo, tree, NULL, 0)) {
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return;
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}
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if (try_heuristic_first) {
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/* do lookup with the heuristic subdissector table */
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if (dissector_try_heuristic(heur_subdissector_list, next_tvb, pinfo,
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tree, &hdtbl_entry, NULL)) {
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return;
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}
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}
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/*
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* Do lookups with the subdissector table.
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* We try the port number with the lower value first, followed by the
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* port number with the higher value. This means that, for packets
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* where a dissector is registered for *both* port numbers:
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*
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* 1) we pick the same dissector for traffic going in both directions;
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*
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* 2) we prefer the port number that's more likely to be the right
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* one (as that prefers well-known ports to reserved ports);
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*
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* although there is, of course, no guarantee that any such strategy
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* will always pick the right port number.
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* XXX - we ignore port numbers of 0, as some dissectors use a port
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* number of 0 to disable the port.
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*/
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if (sport > dport) {
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low_port = dport;
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high_port = sport;
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} else {
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low_port = sport;
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high_port = dport;
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}
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if (low_port != 0 &&
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dissector_try_uint(dccp_subdissector_table, low_port,
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next_tvb, pinfo, tree)) {
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return;
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}
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if (high_port != 0 &&
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dissector_try_uint(dccp_subdissector_table, high_port,
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next_tvb, pinfo, tree)) {
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return;
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}
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if (!try_heuristic_first) {
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/* do lookup with the heuristic subdissector table */
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if (dissector_try_heuristic(heur_subdissector_list, next_tvb,
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pinfo, tree, &hdtbl_entry, NULL)) {
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return;
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}
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}
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/* Oh, well, we don't know this; dissect it as data. */
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call_data_dissector(next_tvb, pinfo, tree);
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}
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/* Conversation and process code originally copied from packet-udp.c */
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static struct dccp_analysis *
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init_dccp_conversation_data(packet_info *pinfo)
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{
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struct dccp_analysis *dccpd;
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/* Initialize the dccp protocol data structure to add to the dccp conversation */
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dccpd = wmem_new0(wmem_file_scope(), struct dccp_analysis);
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dccpd->flow1.static_flags = 0;
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dccpd->flow1.base_seq = 0;
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dccpd->flow2.static_flags = 0;
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dccpd->flow2.base_seq = 0;
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dccpd->stream = dccp_stream_count++;
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dccpd->ts_first = pinfo->abs_ts;
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dccpd->ts_prev = pinfo->abs_ts;
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return dccpd;
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}
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static struct dccp_analysis *
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get_dccp_conversation_data(conversation_t *conv, packet_info *pinfo)
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{
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int direction;
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struct dccp_analysis *dccpd;
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/* Get the data for this conversation */
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dccpd=(struct dccp_analysis *)conversation_get_proto_data(conv, proto_dccp);
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/* If the conversation was just created or it matched a
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* conversation with template options, dccpd will not
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* have been initialized. So, initialize
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* a new dccpd structure for the conversation.
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*/
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if (!dccpd) {
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dccpd = init_dccp_conversation_data(pinfo);
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conversation_add_proto_data(conv, proto_dccp, dccpd);
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}
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/* check direction and get ua lists */
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direction=cmp_address(&pinfo->src, &pinfo->dst);
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/* if the addresses are equal, match the ports instead */
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if (direction == 0) {
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direction= (pinfo->srcport > pinfo->destport) ? 1 : -1;
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}
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if (direction >= 0) {
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dccpd->fwd=&(dccpd->flow1);
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dccpd->rev=&(dccpd->flow2);
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} else {
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dccpd->fwd=&(dccpd->flow2);
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dccpd->rev=&(dccpd->flow1);
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}
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return dccpd;
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}
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static const char* dccp_conv_get_filter_type(conv_item_t* conv, conv_filter_type_e filter)
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{
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if (filter == CONV_FT_SRC_PORT)
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return "dccp.srcport";
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if (filter == CONV_FT_DST_PORT)
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return "dccp.dstport";
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if (filter == CONV_FT_ANY_PORT)
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return "dccp.port";
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if(!conv) {
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return CONV_FILTER_INVALID;
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}
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if (filter == CONV_FT_SRC_ADDRESS) {
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if (conv->src_address.type == AT_IPv4)
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return "ip.src";
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if (conv->src_address.type == AT_IPv6)
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return "ipv6.src";
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}
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if (filter == CONV_FT_DST_ADDRESS) {
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if (conv->dst_address.type == AT_IPv4)
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return "ip.dst";
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if (conv->dst_address.type == AT_IPv6)
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return "ipv6.dst";
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}
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if (filter == CONV_FT_ANY_ADDRESS) {
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if (conv->src_address.type == AT_IPv4)
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return "ip.addr";
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if (conv->src_address.type == AT_IPv6)
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return "ipv6.addr";
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}
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return CONV_FILTER_INVALID;
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}
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static ct_dissector_info_t dccp_ct_dissector_info = {&dccp_conv_get_filter_type};
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static tap_packet_status
|
|
dccpip_conversation_packet(void *pct, packet_info *pinfo, epan_dissect_t *edt _U_, const void *vip)
|
|
{
|
|
conv_hash_t *hash = (conv_hash_t*) pct;
|
|
const e_dccphdr *dccphdr=(const e_dccphdr *)vip;
|
|
|
|
add_conversation_table_data_with_conv_id(hash, &dccphdr->ip_src, &dccphdr->ip_dst, dccphdr->sport, dccphdr->dport, (conv_id_t) dccphdr->stream, 1, pinfo->fd->pkt_len, &pinfo->rel_ts, &pinfo->abs_ts, &dccp_ct_dissector_info, ENDPOINT_DCCP);
|
|
|
|
return TAP_PACKET_REDRAW;
|
|
}
|
|
|
|
static const char* dccp_host_get_filter_type(hostlist_talker_t* host, conv_filter_type_e filter)
|
|
{
|
|
|
|
if (filter == CONV_FT_SRC_PORT)
|
|
return "dccp.srcport";
|
|
|
|
if (filter == CONV_FT_DST_PORT)
|
|
return "dccp.dstport";
|
|
|
|
if (filter == CONV_FT_ANY_PORT)
|
|
return "dccp.port";
|
|
|
|
if(!host) {
|
|
return CONV_FILTER_INVALID;
|
|
}
|
|
|
|
|
|
if (filter == CONV_FT_SRC_ADDRESS) {
|
|
if (host->myaddress.type == AT_IPv4)
|
|
return "ip.src";
|
|
if (host->myaddress.type == AT_IPv6)
|
|
return "ipv6.src";
|
|
}
|
|
|
|
if (filter == CONV_FT_DST_ADDRESS) {
|
|
if (host->myaddress.type == AT_IPv4)
|
|
return "ip.dst";
|
|
if (host->myaddress.type == AT_IPv6)
|
|
return "ipv6.dst";
|
|
}
|
|
|
|
if (filter == CONV_FT_ANY_ADDRESS) {
|
|
if (host->myaddress.type == AT_IPv4)
|
|
return "ip.addr";
|
|
if (host->myaddress.type == AT_IPv6)
|
|
return "ipv6.addr";
|
|
}
|
|
|
|
return CONV_FILTER_INVALID;
|
|
}
|
|
|
|
static hostlist_dissector_info_t dccp_host_dissector_info = {&dccp_host_get_filter_type};
|
|
|
|
static tap_packet_status
|
|
dccpip_hostlist_packet(void *pit, packet_info *pinfo, epan_dissect_t *edt _U_, const void *vip)
|
|
{
|
|
conv_hash_t *hash = (conv_hash_t*) pit;
|
|
const e_dccphdr *dccphdr=(const e_dccphdr *)vip;
|
|
|
|
/* Take two "add" passes per packet, adding for each direction, ensures that all
|
|
packets are counted properly (even if address is sending to itself)
|
|
XXX - this could probably be done more efficiently inside hostlist_table */
|
|
add_hostlist_table_data(hash, &dccphdr->ip_src, dccphdr->sport, TRUE, 1, pinfo->fd->pkt_len, &dccp_host_dissector_info, ENDPOINT_DCCP);
|
|
add_hostlist_table_data(hash, &dccphdr->ip_dst, dccphdr->dport, FALSE, 1, pinfo->fd->pkt_len, &dccp_host_dissector_info, ENDPOINT_DCCP);
|
|
|
|
return TAP_PACKET_REDRAW;
|
|
}
|
|
|
|
/* Return the current stream count */
|
|
guint32 get_dccp_stream_count(void)
|
|
{
|
|
return dccp_stream_count;
|
|
}
|
|
|
|
static gboolean
|
|
dccp_filter_valid(packet_info *pinfo)
|
|
{
|
|
return proto_is_frame_protocol(pinfo->layers, "dccp");
|
|
}
|
|
|
|
static gchar*
|
|
dccp_build_filter(packet_info *pinfo)
|
|
{
|
|
if( pinfo->net_src.type == AT_IPv4 && pinfo->net_dst.type == AT_IPv4 ) {
|
|
/* DCCP over IPv4 */
|
|
return ws_strdup_printf("(ip.addr eq %s and ip.addr eq %s) and (dccp.port eq %d and dccp.port eq %d)",
|
|
address_to_str(pinfo->pool, &pinfo->net_src),
|
|
address_to_str(pinfo->pool, &pinfo->net_dst),
|
|
pinfo->srcport, pinfo->destport );
|
|
}
|
|
|
|
if( pinfo->net_src.type == AT_IPv6 && pinfo->net_dst.type == AT_IPv6 ) {
|
|
/* DCCP over IPv6 */
|
|
return ws_strdup_printf("(ipv6.addr eq %s and ipv6.addr eq %s) and (dccp.port eq %d and dccp.port eq %d)",
|
|
address_to_str(pinfo->pool, &pinfo->net_src),
|
|
address_to_str(pinfo->pool, &pinfo->net_dst),
|
|
pinfo->srcport, pinfo->destport );
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static gchar *dccp_follow_conv_filter(epan_dissect_t *edt _U_, packet_info *pinfo, guint *stream, guint *sub_stream _U_)
|
|
{
|
|
conversation_t *conv;
|
|
struct dccp_analysis *dccpd;
|
|
|
|
if( ((pinfo->net_src.type == AT_IPv4 && pinfo->net_dst.type == AT_IPv4) ||
|
|
(pinfo->net_src.type == AT_IPv6 && pinfo->net_dst.type == AT_IPv6))
|
|
&& (conv=find_conversation_pinfo(pinfo, 0)) != NULL )
|
|
{
|
|
/* DCCP over IPv4/6 */
|
|
dccpd = get_dccp_conversation_data(conv, pinfo);
|
|
*stream = dccpd->stream;
|
|
return ws_strdup_printf("dccp.stream eq %u", dccpd->stream);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static gchar *dccp_follow_index_filter(guint stream, guint sub_stream _U_)
|
|
{
|
|
return ws_strdup_printf("dccp.stream eq %u", stream);
|
|
}
|
|
|
|
static gchar *dccp_follow_address_filter(address *src_addr, address *dst_addr, int src_port, int dst_port)
|
|
{
|
|
const gchar *ip_version = src_addr->type == AT_IPv6 ? "v6" : "";
|
|
gchar src_addr_str[WS_INET6_ADDRSTRLEN];
|
|
gchar dst_addr_str[WS_INET6_ADDRSTRLEN];
|
|
|
|
address_to_str_buf(src_addr, src_addr_str, sizeof(src_addr_str));
|
|
address_to_str_buf(dst_addr, dst_addr_str, sizeof(dst_addr_str));
|
|
|
|
return ws_strdup_printf("((ip%s.src eq %s and dccp.srcport eq %d) and "
|
|
"(ip%s.dst eq %s and dccp.dstport eq %d))"
|
|
" or "
|
|
"((ip%s.src eq %s and dccp.srcport eq %d) and "
|
|
"(ip%s.dst eq %s and dccp.dstport eq %d))",
|
|
ip_version, src_addr_str, src_port,
|
|
ip_version, dst_addr_str, dst_port,
|
|
ip_version, dst_addr_str, dst_port,
|
|
ip_version, src_addr_str, src_port);
|
|
}
|
|
|
|
/*
|
|
* decode a variable-length number of nbytes starting at offset. Based on
|
|
* a concept by Arnaldo de Melo
|
|
*/
|
|
static guint64
|
|
dccp_ntoh_var(tvbuff_t *tvb, gint offset, guint nbytes)
|
|
{
|
|
guint64 value = 0;
|
|
|
|
switch (nbytes)
|
|
{
|
|
case 5:
|
|
value = tvb_get_ntoh40(tvb, offset);
|
|
break;
|
|
case 4:
|
|
value = tvb_get_ntohl(tvb, offset);
|
|
break;
|
|
case 3:
|
|
value = tvb_get_ntoh24(tvb, offset);
|
|
break;
|
|
case 2:
|
|
value = tvb_get_ntohs(tvb, offset);
|
|
break;
|
|
case 1:
|
|
value = tvb_get_guint8(tvb, offset);
|
|
break;
|
|
case 0:
|
|
// do nothing
|
|
break;
|
|
case 6:
|
|
default:
|
|
value = tvb_get_ntoh48(tvb, offset);
|
|
break;
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
static void
|
|
dissect_feature_options(proto_tree *dccp_options_tree, tvbuff_t *tvb,
|
|
int offset, guint8 option_len,
|
|
guint8 option_type)
|
|
{
|
|
guint8 feature_number = tvb_get_guint8(tvb, offset);
|
|
proto_item *dccp_item;
|
|
proto_tree *feature_tree;
|
|
int i;
|
|
|
|
feature_tree =
|
|
proto_tree_add_subtree_format(dccp_options_tree, tvb, offset, option_len,
|
|
ett_dccp_feature, &dccp_item, "%s(",
|
|
rval_to_str_const(option_type, dccp_feature_numbers_rvals, "Unknown feature number"));
|
|
|
|
proto_tree_add_uint(feature_tree, hf_dccp_feature_number, tvb,
|
|
offset, 1, feature_number);
|
|
offset++;
|
|
option_len--;
|
|
|
|
/*
|
|
* decode the feature according to whether it is server-priority (list)
|
|
* or NN (single number)
|
|
*/
|
|
switch (feature_number) {
|
|
|
|
/* Server Priority features (RFC 4340, 6.3.1) */
|
|
case 1: /* Congestion Control ID (CCID); fall through */
|
|
case 2: /* Allow Short Seqnums; fall through */
|
|
case 4: /* ECN Incapable; fall through */
|
|
case 6: /* Send Ack Vector; fall through */
|
|
case 7: /* Send NDP Count; fall through */
|
|
case 8: /* Minimum Checksum Coverage; fall through */
|
|
case 9: /* Check Data Checksum; fall through */
|
|
case 192: /* Send Loss Event Rate, RFC 4342, section 8.4 */
|
|
for (i = 0; i < option_len; i++)
|
|
proto_item_append_text(dccp_item, "%s %d", i ? "," : "",
|
|
tvb_get_guint8(tvb,
|
|
offset + i));
|
|
break;
|
|
|
|
/* Non-negotiable features (RFC 4340, 6.3.2) */
|
|
|
|
case 3: /* Sequence Window; fall through */
|
|
case 5: /* Ack Ratio */
|
|
|
|
if (option_len > 0) /* could be empty Confirm */
|
|
proto_item_append_text(dccp_item, " %" PRIu64,
|
|
dccp_ntoh_var(tvb, offset, option_len));
|
|
break;
|
|
|
|
/* Reserved, specific, or unknown features */
|
|
default:
|
|
proto_item_append_text(dccp_item, "%d", feature_number);
|
|
break;
|
|
}
|
|
proto_item_append_text(dccp_item, ")");
|
|
}
|
|
|
|
/*
|
|
* This function dissects DCCP options
|
|
*/
|
|
static void
|
|
dissect_options(tvbuff_t *tvb, packet_info *pinfo,
|
|
proto_tree *dccp_options_tree, proto_tree *tree _U_,
|
|
e_dccphdr *dccph _U_,
|
|
int offset_start,
|
|
int offset_end)
|
|
{
|
|
/*
|
|
* if here I'm sure there is at least offset_end - offset_start bytes
|
|
* in tvb and it should be options
|
|
*/
|
|
int offset = offset_start;
|
|
guint8 option_type = 0;
|
|
guint8 option_len = 0;
|
|
guint32 p;
|
|
proto_item *option_item;
|
|
proto_tree *option_tree;
|
|
|
|
while (offset < offset_end) {
|
|
/* first byte is the option type */
|
|
option_type = tvb_get_guint8(tvb, offset);
|
|
option_item =
|
|
proto_tree_add_uint(dccp_options_tree, hf_dccp_option_type, tvb,
|
|
offset,
|
|
1,
|
|
option_type);
|
|
|
|
if (option_type >= 32) { /* variable length options */
|
|
option_len = tvb_get_guint8(tvb, offset+1);
|
|
|
|
if (option_len < 2) {
|
|
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
|
|
"Option length incorrect, must be >= 2");
|
|
return;
|
|
}
|
|
|
|
proto_item_set_len(option_item, option_len);
|
|
/* Remove the type and length fields out of length */
|
|
offset += 2;
|
|
option_len -= 2;
|
|
} else { /* 1byte options */
|
|
option_len = 1;
|
|
}
|
|
|
|
option_tree = proto_item_add_subtree(option_item, ett_dccp_options_item);
|
|
switch (option_type) {
|
|
case 0:
|
|
proto_tree_add_item(option_tree, hf_dccp_padding, tvb, offset, option_len, ENC_NA);
|
|
break;
|
|
case 1:
|
|
proto_tree_add_item(option_tree, hf_dccp_mandatory, tvb, offset, option_len, ENC_NA);
|
|
break;
|
|
case 2:
|
|
proto_tree_add_item(option_tree, hf_dccp_slow_receiver, tvb, offset, option_len, ENC_NA);
|
|
break;
|
|
case 32:
|
|
case 33:
|
|
case 34:
|
|
case 35:
|
|
dissect_feature_options(option_tree, tvb, offset, option_len,
|
|
option_type);
|
|
break;
|
|
case 36:
|
|
proto_tree_add_item(option_tree, hf_dccp_init_cookie, tvb, offset, option_len, ENC_NA);
|
|
break;
|
|
case 37:
|
|
if (option_len > 6)
|
|
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
|
|
"NDP Count too long (max 6 bytes)");
|
|
else
|
|
proto_tree_add_item(option_tree, hf_dccp_ndp_count, tvb, offset, option_len, ENC_BIG_ENDIAN);
|
|
break;
|
|
case 38:
|
|
proto_tree_add_item(option_tree, hf_dccp_ack_vector_nonce_0, tvb, offset, option_len, ENC_NA);
|
|
break;
|
|
case 39:
|
|
proto_tree_add_item(option_tree, hf_dccp_ack_vector_nonce_1, tvb, offset, option_len, ENC_NA);
|
|
break;
|
|
case 40:
|
|
proto_tree_add_item(option_tree, hf_dccp_data_dropped, tvb, offset, option_len, ENC_NA);
|
|
break;
|
|
case 41:
|
|
if (option_len == 4)
|
|
proto_tree_add_item(option_tree, hf_dccp_timestamp, tvb,
|
|
offset, 4, ENC_BIG_ENDIAN);
|
|
else
|
|
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
|
|
"Timestamp too long [%u != 4]", option_len);
|
|
break;
|
|
case 42:
|
|
if (option_len == 4)
|
|
proto_tree_add_item(option_tree, hf_dccp_timestamp_echo,
|
|
tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
else if (option_len == 6) {
|
|
proto_tree_add_item(option_tree, hf_dccp_timestamp_echo,
|
|
tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(option_tree, hf_dccp_elapsed_time,
|
|
tvb, offset + 4, 2, ENC_BIG_ENDIAN);
|
|
} else if (option_len == 8) {
|
|
proto_tree_add_item(option_tree, hf_dccp_timestamp_echo,
|
|
tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(option_tree, hf_dccp_elapsed_time,
|
|
tvb, offset + 4, 4, ENC_BIG_ENDIAN);
|
|
} else
|
|
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
|
|
"Wrong Timestamp Echo length");
|
|
break;
|
|
case 43:
|
|
if (option_len == 2)
|
|
proto_tree_add_item(option_tree, hf_dccp_elapsed_time,
|
|
tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
else if (option_len == 4)
|
|
proto_tree_add_item(option_tree, hf_dccp_elapsed_time,
|
|
tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
else
|
|
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
|
|
"Wrong Elapsed Time length");
|
|
break;
|
|
case 44:
|
|
if (option_len == 4) {
|
|
proto_tree_add_item(option_tree, hf_dccp_data_checksum,
|
|
tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
} else
|
|
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
|
|
"Wrong Data checksum length");
|
|
break;
|
|
case 192: /* RFC 4342, 8.5 */
|
|
if (option_len == 4) {
|
|
p = tvb_get_ntohl(tvb, offset);
|
|
/*
|
|
* According to the comment in section 8.5 of RFC 4342,
|
|
* 0xffffffff can mean zero
|
|
*/
|
|
if (p == 0xFFFFFFFF)
|
|
proto_tree_add_uint_format_value(option_tree, hf_dccp_ccid3_loss_event_rate, tvb, offset,
|
|
option_len, p, "0 (or max)");
|
|
else
|
|
proto_tree_add_uint(option_tree, hf_dccp_ccid3_loss_event_rate, tvb, offset, option_len, p);
|
|
} else
|
|
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
|
|
"Wrong CCID3 Loss Event Rate length");
|
|
break;
|
|
case 193: /* RFC 4342, 8.6 */
|
|
proto_tree_add_item(dccp_options_tree, hf_dccp_ccid3_loss_intervals, tvb, offset, option_len, ENC_NA);
|
|
/*
|
|
* FIXME: not implemented and apparently not used by any
|
|
* implementation so far
|
|
*/
|
|
break;
|
|
case 194: /* RFC 4342, 8.3 */
|
|
if (option_len == 4)
|
|
proto_tree_add_uint_format_value(option_tree, hf_dccp_ccid3_receive_rate, tvb, offset, option_len,
|
|
tvb_get_ntohl(tvb, offset), "%u bytes/sec",
|
|
tvb_get_ntohl(tvb, offset));
|
|
else
|
|
expert_add_info_format(pinfo, option_item, &ei_dccp_option_len_bad,
|
|
"Wrong CCID3 Receive Rate length");
|
|
break;
|
|
default:
|
|
if (((option_type >= 45) && (option_type <= 127)) ||
|
|
((option_type >= 3) && (option_type <= 31))) {
|
|
proto_tree_add_item(option_tree, hf_dccp_option_reserved, tvb, offset, option_len, ENC_NA);
|
|
break;
|
|
}
|
|
|
|
if (option_type >= 128) {
|
|
proto_tree_add_bytes_format(option_tree, hf_dccp_ccid_option_data, tvb, offset, option_len,
|
|
NULL, "CCID option %d", option_type);
|
|
break;
|
|
}
|
|
|
|
/* if here we don't know this option */
|
|
proto_tree_add_item(option_tree, hf_dccp_option_unknown, tvb, offset, option_len, ENC_NA);
|
|
break;
|
|
} /* end switch() */
|
|
offset += option_len; /* move offset past the dissected option */
|
|
} /* end while() */
|
|
}
|
|
|
|
/*
|
|
* compute DCCP checksum coverage according to RFC 4340, section 9
|
|
*/
|
|
static inline guint
|
|
dccp_csum_coverage(const e_dccphdr *dccph, guint len)
|
|
{
|
|
guint cov;
|
|
|
|
if (dccph->cscov == 0)
|
|
return len;
|
|
|
|
cov = (dccph->data_offset + dccph->cscov - 1) * (guint)sizeof (guint32);
|
|
return (cov > len) ? len : cov;
|
|
}
|
|
|
|
static int
|
|
dissect_dccp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
|
|
{
|
|
proto_tree *dccp_tree;
|
|
proto_item *item;
|
|
proto_tree *dccp_options_tree = NULL;
|
|
proto_item *dccp_item = NULL;
|
|
proto_item *hidden_item, *offset_item;
|
|
vec_t cksum_vec[4];
|
|
guint32 phdr[2];
|
|
guint offset = 0;
|
|
guint len = 0;
|
|
guint reported_len = 0;
|
|
guint csum_coverage_len;
|
|
guint advertised_dccp_header_len = 0;
|
|
guint options_len = 0;
|
|
guint64 seq; /* Absolute or relative seq number (depending on DCCP_S_BASE_SEQ_SET) */
|
|
guint64 ack; /* Absolute or relative ack number (depending on DCCP_S_BASE_SEQ_SET) */
|
|
e_dccphdr *dccph;
|
|
conversation_t *conv = NULL;
|
|
struct dccp_analysis *dccpd;
|
|
|
|
dccph = wmem_new0(pinfo->pool, e_dccphdr);
|
|
dccph->sport = tvb_get_ntohs(tvb, offset);
|
|
dccph->dport = tvb_get_ntohs(tvb, offset + 2);
|
|
copy_address_shallow(&dccph->ip_src, &pinfo->src);
|
|
copy_address_shallow(&dccph->ip_dst, &pinfo->dst);
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DCCP");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
col_append_ports(pinfo->cinfo, COL_INFO, PT_DCCP, dccph->sport, dccph->dport);
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|
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dccp_item = proto_tree_add_item(tree, proto_dccp, tvb, offset, -1, ENC_NA);
|
|
if (dccp_summary_in_tree) {
|
|
proto_item_append_text(dccp_item, ", Src Port: %s, Dst Port: %s",
|
|
port_with_resolution_to_str(pinfo->pool, PT_DCCP, dccph->sport),
|
|
port_with_resolution_to_str(pinfo->pool, PT_DCCP, dccph->dport));
|
|
}
|
|
dccp_tree = proto_item_add_subtree(dccp_item, ett_dccp);
|
|
|
|
proto_tree_add_item(dccp_tree, hf_dccp_srcport, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
hidden_item = proto_tree_add_item(dccp_tree, hf_dccp_port, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
proto_item_set_hidden(hidden_item);
|
|
offset += 2;
|
|
|
|
proto_tree_add_item(dccp_tree, hf_dccp_dstport, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
hidden_item = proto_tree_add_item(dccp_tree, hf_dccp_port, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
proto_item_set_hidden(hidden_item);
|
|
offset += 2;
|
|
|
|
/*
|
|
* update pinfo structure. I guess I have to do it, because this
|
|
* is a transport protocol dissector.
|
|
*/
|
|
pinfo->ptype = PT_DCCP;
|
|
pinfo->srcport = dccph->sport;
|
|
pinfo->destport = dccph->dport;
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|
|
|
/* find (or create if needed) the conversation for this DCCP session */
|
|
conv = find_or_create_conversation(pinfo);
|
|
dccpd = get_dccp_conversation_data(conv, pinfo);
|
|
item = proto_tree_add_uint(dccp_tree, hf_dccp_stream, tvb, offset, 0, dccpd->stream);
|
|
proto_item_set_generated(item);
|
|
|
|
/* Copy the stream index into the header as well to make it available
|
|
* to tap listeners.
|
|
*/
|
|
dccph->stream = dccpd->stream;
|
|
|
|
dccph->data_offset = tvb_get_guint8(tvb, offset);
|
|
advertised_dccp_header_len = dccph->data_offset * 4;
|
|
offset_item = proto_tree_add_uint(dccp_tree, hf_dccp_data_offset, tvb, offset, 1,
|
|
dccph->data_offset);
|
|
offset += 1;
|
|
|
|
dccph->cscov = tvb_get_guint8(tvb, offset) & 0x0F;
|
|
dccph->ccval = tvb_get_guint8(tvb, offset) & 0xF0;
|
|
dccph->ccval >>= 4;
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_ccval, tvb, offset, 1,
|
|
dccph->ccval);
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_cscov, tvb, offset, 1,
|
|
dccph->cscov);
|
|
offset += 1;
|
|
|
|
dccph->checksum = tvb_get_ntohs(tvb, offset);
|
|
|
|
/*
|
|
* checksum analysis taken from packet-udp (difference: mandatory
|
|
* checksums in DCCP)
|
|
*/
|
|
reported_len = tvb_reported_length(tvb);
|
|
len = tvb_captured_length(tvb);
|
|
csum_coverage_len = dccp_csum_coverage(dccph, reported_len);
|
|
|
|
if (dccp_check_checksum && !pinfo->fragmented && len >= csum_coverage_len) {
|
|
/* We're supposed to check the checksum, and the packet isn't part
|
|
* of a fragmented datagram and isn't truncated, so we can checksum it.
|
|
* XXX - make a bigger scatter-gather list once we do fragment
|
|
* reassembly? */
|
|
/* Set up the fields of the pseudo-header. */
|
|
SET_CKSUM_VEC_PTR(cksum_vec[0], (const guint8 *)pinfo->src.data, pinfo->src.len);
|
|
SET_CKSUM_VEC_PTR(cksum_vec[1], (const guint8 *)pinfo->dst.data, pinfo->dst.len);
|
|
switch (pinfo->src.type) {
|
|
case AT_IPv4:
|
|
phdr[0] = g_htonl((IP_PROTO_DCCP << 16) + reported_len);
|
|
SET_CKSUM_VEC_PTR(cksum_vec[2], (const guint8 *) &phdr, 4);
|
|
break;
|
|
case AT_IPv6:
|
|
phdr[0] = g_htonl(reported_len);
|
|
phdr[1] = g_htonl(IP_PROTO_DCCP);
|
|
SET_CKSUM_VEC_PTR(cksum_vec[2], (const guint8 *) &phdr, 8);
|
|
break;
|
|
|
|
default:
|
|
/* DCCP runs only atop IPv4 and IPv6... */
|
|
DISSECTOR_ASSERT_NOT_REACHED();
|
|
break;
|
|
}
|
|
SET_CKSUM_VEC_TVB(cksum_vec[3], tvb, 0, csum_coverage_len);
|
|
proto_tree_add_checksum(dccp_tree, tvb, offset, hf_dccp_checksum, hf_dccp_checksum_status, &ei_dccp_checksum, pinfo, in_cksum(&cksum_vec[0], 4),
|
|
ENC_BIG_ENDIAN, PROTO_CHECKSUM_VERIFY|PROTO_CHECKSUM_IN_CKSUM);
|
|
} else {
|
|
proto_tree_add_checksum(dccp_tree, tvb, offset, hf_dccp_checksum, hf_dccp_checksum_status, &ei_dccp_checksum, pinfo, 0,
|
|
ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
|
|
}
|
|
offset += 2;
|
|
|
|
dccph->reserved1 = tvb_get_guint8(tvb, offset) & 0xE0;
|
|
dccph->reserved1 >>= 5;
|
|
hidden_item =
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_res1, tvb, offset, 1,
|
|
dccph->reserved1);
|
|
proto_item_set_hidden(hidden_item);
|
|
|
|
dccph->type = tvb_get_guint8(tvb, offset) & 0x1E;
|
|
dccph->type >>= 1;
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_type, tvb, offset, 1,
|
|
dccph->type);
|
|
if (dccp_summary_in_tree) {
|
|
proto_item_append_text(dccp_item, " [%s]",
|
|
val_to_str_const(dccph->type, dccp_packet_type_vals,
|
|
"Unknown Type"));
|
|
}
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " [%s]",
|
|
val_to_str_const(dccph->type, dccp_packet_type_vals,
|
|
"Unknown Type"));
|
|
|
|
dccph->x = tvb_get_guint8(tvb, offset) & 0x01;
|
|
proto_tree_add_boolean(dccp_tree, hf_dccp_x, tvb, offset, 1,
|
|
dccph->x);
|
|
offset += 1;
|
|
|
|
if (dccph->x) {
|
|
if (advertised_dccp_header_len < DCCP_GEN_HDR_LEN_X) {
|
|
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
|
|
"Advertised header length (%u) is smaller than the minimum (%u)",
|
|
advertised_dccp_header_len, DCCP_GEN_HDR_LEN_X);
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
dccph->reserved2 = tvb_get_guint8(tvb, offset);
|
|
hidden_item =
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_res2, tvb, offset, 1,
|
|
dccph->reserved2);
|
|
proto_item_set_hidden(hidden_item);
|
|
offset += 1;
|
|
|
|
dccph->seq = tvb_get_ntoh48(tvb, offset);
|
|
if((dccp_relative_seq) && (dccpd->fwd->static_flags & DCCP_S_BASE_SEQ_SET)) {
|
|
seq = dccph->seq - dccpd->fwd->base_seq;
|
|
proto_tree_add_uint64_format_value(dccp_tree, hf_dccp_seq, tvb, offset, 6,
|
|
seq, "%" PRIu64 " (relative sequence number)", seq);
|
|
}
|
|
else {
|
|
seq = dccph->seq;
|
|
}
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_seq_abs, tvb, offset, 6, dccph->seq);
|
|
|
|
offset += 6;
|
|
} else {
|
|
if (advertised_dccp_header_len < DCCP_GEN_HDR_LEN_NO_X) {
|
|
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
|
|
"Advertised header length (%u) is smaller than the minimum (%u)",
|
|
advertised_dccp_header_len, DCCP_GEN_HDR_LEN_NO_X);
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
dccph->seq = tvb_get_ntoh24(tvb, offset);
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_seq, tvb, offset, 3, dccph->seq);
|
|
if((dccp_relative_seq) && (dccpd->fwd->static_flags & DCCP_S_BASE_SEQ_SET)) {
|
|
seq = (dccph->seq - dccpd->fwd->base_seq) & 0xffffff;
|
|
proto_tree_add_uint64_format_value(dccp_tree, hf_dccp_seq, tvb, offset, 3,
|
|
seq, "%" PRIu64 " (relative sequence number)", seq);
|
|
}
|
|
else {
|
|
seq = dccph->seq;
|
|
}
|
|
offset += 3;
|
|
}
|
|
if (dccp_summary_in_tree) {
|
|
proto_item_append_text(dccp_item, " Seq=%" PRIu64, seq);
|
|
}
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " Seq=%" PRIu64, seq);
|
|
|
|
/* dissecting type dependent additional fields */
|
|
switch (dccph->type) {
|
|
case 0x0: /* DCCP-Request */
|
|
case 0xA: /* DCCP-Listen */
|
|
if (advertised_dccp_header_len < offset + 4) {
|
|
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
|
|
"Advertised header length (%u) is smaller than the minimum (%u) for %s",
|
|
advertised_dccp_header_len, offset + 4,
|
|
val_to_str(dccph->type, dccp_packet_type_vals, "Unknown (%u)"));
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
dccph->service_code = tvb_get_ntohl(tvb, offset);
|
|
if (tree)
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_service_code, tvb, offset, 4,
|
|
dccph->service_code);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (service=%s)",
|
|
val_to_str(dccph->service_code, dccp_service_code_vals, "Unknown (%u)"));
|
|
offset += 4; /* move offset past the service code */
|
|
|
|
if( !(dccpd->fwd->static_flags & DCCP_S_BASE_SEQ_SET) ) {
|
|
dccpd->fwd->base_seq = dccph->seq;
|
|
dccpd->fwd->static_flags |= DCCP_S_BASE_SEQ_SET;
|
|
}
|
|
|
|
break;
|
|
case 0x1: /* DCCP-Response */
|
|
if (advertised_dccp_header_len < offset + 12) {
|
|
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
|
|
"Advertised header length (%u) is smaller than the minimum (%u) for Response",
|
|
advertised_dccp_header_len, offset + 12);
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
dccph->ack_reserved = tvb_get_ntohs(tvb, offset);
|
|
if (tree) {
|
|
hidden_item =
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_ack_res, tvb, offset, 2,
|
|
dccph->ack_reserved);
|
|
proto_item_set_hidden(hidden_item);
|
|
}
|
|
dccph->ack = tvb_get_ntohs(tvb, offset + 2);
|
|
dccph->ack <<= 32;
|
|
dccph->ack += tvb_get_ntohl(tvb, offset + 4);
|
|
|
|
if((dccp_relative_seq) && (dccpd->rev->static_flags & DCCP_S_BASE_SEQ_SET)) {
|
|
ack = dccph->ack - dccpd->rev->base_seq;
|
|
}
|
|
else {
|
|
ack = dccph->ack;
|
|
}
|
|
|
|
if (tree) {
|
|
if((dccp_relative_seq) && (dccpd->rev->static_flags & DCCP_S_BASE_SEQ_SET)) {
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_ack, tvb, offset + 2, 6, ack);
|
|
}
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_ack_abs, tvb, offset + 2, 6, dccph->ack);
|
|
}
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (Ack=%" PRIu64 ")", ack);
|
|
offset += 8; /* move offset past the Acknowledgement Number Subheader */
|
|
|
|
dccph->service_code = tvb_get_ntohl(tvb, offset);
|
|
if (tree)
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_service_code, tvb, offset, 4,
|
|
dccph->service_code);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (service=%s)",
|
|
val_to_str(dccph->service_code, dccp_service_code_vals, "Unknown (%u)"));
|
|
|
|
offset += 4; /* move offset past the service code */
|
|
|
|
if( !(dccpd->fwd->static_flags & DCCP_S_BASE_SEQ_SET) ) {
|
|
dccpd->fwd->base_seq = dccph->seq;
|
|
dccpd->fwd->static_flags |= DCCP_S_BASE_SEQ_SET;
|
|
}
|
|
|
|
break;
|
|
case 0x2: /* DCCP-Data */
|
|
/* nothing to dissect */
|
|
break;
|
|
case 0x3: /* DCCP-Ack */
|
|
case 0x4: /* DCCP-DataAck */
|
|
if (dccph->x) {
|
|
if (advertised_dccp_header_len < offset + 8) {
|
|
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
|
|
"Advertised header length (%u) is smaller than the minimum (%u) for %s",
|
|
advertised_dccp_header_len, offset + 8,
|
|
val_to_str(dccph->type, dccp_packet_type_vals, "Unknown (%u)"));
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
dccph->ack_reserved = tvb_get_ntohs(tvb, offset);
|
|
if (tree) {
|
|
hidden_item =
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_ack_res, tvb, offset,
|
|
2, dccph->ack_reserved);
|
|
proto_item_set_hidden(hidden_item);
|
|
}
|
|
dccph->ack = tvb_get_ntohs(tvb, offset + 2);
|
|
dccph->ack <<= 32;
|
|
dccph->ack += tvb_get_ntohl(tvb, offset + 4);
|
|
|
|
if((dccp_relative_seq) && (dccpd->rev->static_flags & DCCP_S_BASE_SEQ_SET)) {
|
|
ack = dccph->ack - dccpd->rev->base_seq;
|
|
}
|
|
else {
|
|
ack = dccph->ack;
|
|
}
|
|
|
|
if (tree) {
|
|
if((dccp_relative_seq) && (dccpd->rev->static_flags & DCCP_S_BASE_SEQ_SET)) {
|
|
proto_tree_add_uint64_format_value(dccp_tree, hf_dccp_ack, tvb, offset + 2, 6,
|
|
ack, "%" PRIu64 " (relative acknowledgement number)", ack);
|
|
}
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_ack_abs, tvb, offset + 2, 6, dccph->ack);
|
|
}
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (Ack=%" PRIu64 ")", ack);
|
|
offset += 8; /* move offset past the Ack Number Subheader */
|
|
} else {
|
|
if (advertised_dccp_header_len < offset + 4) {
|
|
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
|
|
"Advertised header length (%u) is smaller than the minimum (%u) for %s",
|
|
advertised_dccp_header_len, offset + 4,
|
|
val_to_str(dccph->type, dccp_packet_type_vals, "Unknown (%u)"));
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
dccph->ack_reserved = tvb_get_guint8(tvb, offset);
|
|
if (tree) {
|
|
hidden_item =
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_ack_res, tvb, offset,
|
|
1, dccph->ack_reserved);
|
|
proto_item_set_hidden(hidden_item);
|
|
}
|
|
dccph->ack = tvb_get_guint8(tvb, offset + 1);
|
|
dccph->ack <<= 16;
|
|
dccph->ack += tvb_get_ntohs(tvb, offset + 2);
|
|
|
|
if((dccp_relative_seq) && (dccpd->rev->static_flags & DCCP_S_BASE_SEQ_SET)) {
|
|
ack = (dccph->ack - dccpd->rev->base_seq) & 0xffffff;
|
|
}
|
|
else {
|
|
ack = dccph->ack;
|
|
}
|
|
|
|
if (tree) {
|
|
if((dccp_relative_seq) && (dccpd->rev->static_flags & DCCP_S_BASE_SEQ_SET)) {
|
|
proto_tree_add_uint64_format_value(dccp_tree, hf_dccp_ack, tvb, offset + 1, 3,
|
|
ack, "%" PRIu64 " (relative acknowledgement number)", ack);
|
|
}
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_ack_abs, tvb, offset + 1, 3, dccph->ack);
|
|
}
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (Ack=%" PRIu64 ")", ack);
|
|
offset += 4; /* move offset past the Ack. Number Subheader */
|
|
}
|
|
break;
|
|
case 0x7: /* DCCP-Reset */
|
|
if (advertised_dccp_header_len < offset + 4) {
|
|
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
|
|
"Advertised header length (%u) is smaller than the minimum (%u) for Reset",
|
|
advertised_dccp_header_len, offset + 4);
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
dccph->ack_reserved = tvb_get_ntohs(tvb, offset);
|
|
|
|
if (tree) {
|
|
hidden_item =
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_ack_res, tvb, offset, 2,
|
|
dccph->ack_reserved);
|
|
proto_item_set_hidden(hidden_item);
|
|
}
|
|
|
|
dccph->ack = tvb_get_ntohs(tvb, offset + 2);
|
|
dccph->ack <<= 32;
|
|
dccph->ack += tvb_get_ntohl(tvb, offset + 4);
|
|
|
|
if((dccp_relative_seq) && (dccpd->rev->static_flags & DCCP_S_BASE_SEQ_SET)) {
|
|
ack = (dccph->ack - dccpd->rev->base_seq) & 0xffffff;
|
|
}
|
|
else {
|
|
ack = dccph->ack;
|
|
}
|
|
|
|
if (tree) {
|
|
if((dccp_relative_seq) && (dccpd->rev->static_flags & DCCP_S_BASE_SEQ_SET)) {
|
|
proto_tree_add_uint64_format_value(dccp_tree, hf_dccp_ack, tvb, offset + 1, 3,
|
|
ack, "%" PRIu64 " (relative acknowledgement number)", ack);
|
|
}
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_ack_abs, tvb, offset + 1, 3, dccph->ack);
|
|
}
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (Ack=%" PRIu64 ")", ack);
|
|
offset += 8; /* move offset past the Ack. Number Subheader */
|
|
|
|
dccph->reset_code = tvb_get_guint8(tvb, offset);
|
|
dccph->data1 = tvb_get_guint8(tvb, offset + 1);
|
|
dccph->data2 = tvb_get_guint8(tvb, offset + 2);
|
|
dccph->data3 = tvb_get_guint8(tvb, offset + 3);
|
|
|
|
if (tree) {
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_reset_code, tvb, offset, 1,
|
|
dccph->reset_code);
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_data1, tvb, offset + 1, 1,
|
|
dccph->data1);
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_data2, tvb, offset + 2, 1,
|
|
dccph->data2);
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_data3, tvb, offset + 3, 1,
|
|
dccph->data3);
|
|
}
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (code=%s)",
|
|
val_to_str_const(dccph->reset_code, dccp_reset_code_vals,
|
|
"Unknown"));
|
|
|
|
offset += 4; /* move offset past the Reset Code and data123 */
|
|
break;
|
|
case 0x5: /* DCCP-CloseReq */
|
|
case 0x6: /* DCCP-Close */
|
|
case 0x8: /* DCCP-Sync */
|
|
case 0x9: /* DCCP-SyncAck */
|
|
if (advertised_dccp_header_len < offset + 8) {
|
|
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
|
|
"Advertised header length (%u) is smaller than the minimum (%u) for %s",
|
|
advertised_dccp_header_len, offset + 8,
|
|
val_to_str(dccph->type, dccp_packet_type_vals, "Unknown (%u)"));
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
dccph->ack_reserved = tvb_get_ntohs(tvb, offset);
|
|
if (tree) {
|
|
hidden_item =
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_ack_res, tvb, offset, 2,
|
|
dccph->ack_reserved);
|
|
proto_item_set_hidden(hidden_item);
|
|
}
|
|
dccph->ack = tvb_get_ntohs(tvb, offset + 2);
|
|
dccph->ack <<= 32;
|
|
dccph->ack += tvb_get_ntohl(tvb, offset + 4);
|
|
|
|
if((dccp_relative_seq) && (dccpd->rev->static_flags & DCCP_S_BASE_SEQ_SET)) {
|
|
ack = (dccph->ack - dccpd->rev->base_seq) & 0xffffff;
|
|
}
|
|
else {
|
|
ack = dccph->ack;
|
|
}
|
|
|
|
if (tree) {
|
|
if((dccp_relative_seq) && (dccpd->rev->static_flags & DCCP_S_BASE_SEQ_SET)) {
|
|
proto_tree_add_uint64_format_value(dccp_tree, hf_dccp_ack, tvb, offset + 1, 3,
|
|
ack, "%" PRIu64 " (relative acknowledgement number)", ack);
|
|
}
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_ack_abs, tvb, offset + 1, 3, dccph->ack);
|
|
}
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, " (Ack=%" PRIu64 ")", ack);
|
|
offset += 8; /* move offset past the Ack. Number Subheader */
|
|
break;
|
|
default:
|
|
expert_add_info(pinfo, dccp_item, &ei_dccp_packet_type_reserved);
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
|
|
/*
|
|
* note: data_offset is the offset from the start of the packet's
|
|
* DCCP header to the start of its application data area, in 32-bit words.
|
|
*/
|
|
if (advertised_dccp_header_len > DCCP_HDR_LEN_MAX) {
|
|
expert_add_info_format(pinfo, offset_item, &ei_dccp_advertised_header_length_bad,
|
|
"Advertised header length (%u) is larger than the maximum (%u)",
|
|
advertised_dccp_header_len, DCCP_HDR_LEN_MAX);
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
|
|
/*
|
|
* The checks done above ensure that
|
|
* advertised_dccp_header_len >= offset.
|
|
*
|
|
* advertised_dccp_header_len - offset is the number of bytes of
|
|
* options.
|
|
*/
|
|
if (advertised_dccp_header_len > offset) {
|
|
options_len = advertised_dccp_header_len - offset;
|
|
if (dccp_tree) {
|
|
dccp_item =
|
|
proto_tree_add_none_format(dccp_tree, hf_dccp_options, tvb,
|
|
offset,
|
|
options_len, "Options: (%u byte%s)",
|
|
options_len,
|
|
plurality(options_len, "", "s"));
|
|
dccp_options_tree = proto_item_add_subtree(dccp_item,
|
|
ett_dccp_options);
|
|
}
|
|
dissect_options(tvb, pinfo, dccp_options_tree, tree, dccph, offset,
|
|
offset + options_len);
|
|
}
|
|
|
|
offset += options_len; /* move offset past the Options */
|
|
proto_item_set_end(dccp_item, tvb, offset);
|
|
|
|
/* queuing tap data */
|
|
tap_queue_packet(dccp_tap, pinfo, dccph);
|
|
|
|
/* call sub-dissectors */
|
|
if (!pinfo->flags.in_error_pkt || tvb_reported_length_remaining(tvb, offset) > 0)
|
|
decode_dccp_ports(tvb, offset, pinfo, tree, dccph->sport, dccph->dport);
|
|
|
|
return tvb_reported_length(tvb);
|
|
}
|
|
|
|
static void
|
|
dccp_init(void)
|
|
{
|
|
dccp_stream_count = 0;
|
|
}
|
|
|
|
void
|
|
proto_register_dccp(void)
|
|
{
|
|
module_t *dccp_module;
|
|
|
|
static hf_register_info hf[] = {
|
|
{
|
|
&hf_dccp_srcport,
|
|
{
|
|
"Source Port", "dccp.srcport",
|
|
FT_UINT16, BASE_PT_DCCP, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_dstport,
|
|
{
|
|
"Destination Port", "dccp.dstport",
|
|
FT_UINT16, BASE_PT_DCCP, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_port,
|
|
{
|
|
"Source or Destination Port", "dccp.port",
|
|
FT_UINT16, BASE_PT_DCCP, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_stream,
|
|
{
|
|
"Stream index", "dccp.stream",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_data_offset,
|
|
{
|
|
"Data Offset", "dccp.data_offset",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_ccval,
|
|
{
|
|
"CCVal", "dccp.ccval",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_cscov,
|
|
{
|
|
"Checksum Coverage", "dccp.cscov",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_checksum_status,
|
|
{
|
|
"Checksum Status", "dccp.checksum.status",
|
|
FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_checksum,
|
|
{
|
|
"Checksum", "dccp.checksum",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_res1,
|
|
{
|
|
"Reserved", "dccp.res1",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_res2,
|
|
{
|
|
"Reserved", "dccp.res2",
|
|
FT_UINT8, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_type,
|
|
{
|
|
"Type", "dccp.type",
|
|
FT_UINT8, BASE_DEC, VALS(dccp_packet_type_vals), 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_x,
|
|
{
|
|
"Extended Sequence Numbers", "dccp.x",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_seq,
|
|
{
|
|
"Sequence Number", "dccp.seq",
|
|
FT_UINT64, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_seq_abs,
|
|
{
|
|
"Sequence Number (raw)", "dccp.seq_raw",
|
|
FT_UINT64, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_ack_res,
|
|
{
|
|
"Reserved", "dccp.ack_res",
|
|
FT_UINT16, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_ack,
|
|
{
|
|
"Acknowledgement Number", "dccp.ack",
|
|
FT_UINT64, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_ack_abs,
|
|
{
|
|
"Acknowledgement Number (raw)", "dccp.ack_raw",
|
|
FT_UINT64, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_service_code,
|
|
{
|
|
"Service Code", "dccp.service_code",
|
|
FT_UINT32, BASE_DEC, VALS(dccp_service_code_vals), 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_reset_code,
|
|
{
|
|
"Reset Code", "dccp.reset_code",
|
|
FT_UINT8, BASE_DEC, VALS(dccp_reset_code_vals), 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_data1,
|
|
{
|
|
"Data 1", "dccp.data1",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_data2,
|
|
{
|
|
"Data 2", "dccp.data2",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_data3,
|
|
{
|
|
"Data 3", "dccp.data3",
|
|
FT_UINT8, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_option_type,
|
|
{
|
|
"Option Type", "dccp.option_type",
|
|
FT_UINT8, BASE_DEC|BASE_RANGE_STRING, RVALS(dccp_options_rvals), 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_feature_number,
|
|
{
|
|
"Feature Number", "dccp.feature_number",
|
|
FT_UINT8, BASE_DEC|BASE_RANGE_STRING, RVALS(dccp_feature_numbers_rvals), 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_ndp_count,
|
|
{
|
|
"NDP Count", "dccp.ndp_count",
|
|
FT_UINT64, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_timestamp,
|
|
{
|
|
"Timestamp", "dccp.timestamp",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_timestamp_echo,
|
|
{
|
|
"Timestamp Echo", "dccp.timestamp_echo",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_elapsed_time,
|
|
{
|
|
"Elapsed Time", "dccp.elapsed_time",
|
|
FT_UINT32, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_data_checksum,
|
|
{
|
|
"Data Checksum", "dccp.checksum_data",
|
|
FT_UINT32, BASE_HEX, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_options,
|
|
{
|
|
"Options", "dccp.options",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"DCCP Options fields", HFILL
|
|
}
|
|
},
|
|
|
|
/* Generated from convert_proto_tree_add_text.pl */
|
|
{ &hf_dccp_padding, { "Padding", "dccp.padding", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_dccp_mandatory, { "Mandatory", "dccp.mandatory", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_dccp_slow_receiver, { "Slow Receiver", "dccp.slow_receiver", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_dccp_init_cookie, { "Init Cookie", "dccp.init_cookie", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_dccp_ack_vector_nonce_0, { "Ack Vector [Nonce 0]", "dccp.ack_vector.nonce_0", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_dccp_ack_vector_nonce_1, { "Ack Vector [Nonce 1]", "dccp.ack_vector.nonce_1", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_dccp_data_dropped, { "Data Dropped", "dccp.data_dropped", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_dccp_ccid3_loss_event_rate, { "CCID3 Loss Event Rate", "dccp.ccid3_loss_event_rate", FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_dccp_ccid3_loss_intervals, { "CCID3 Loss Intervals", "dccp.ccid3_loss_intervals", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_dccp_ccid3_receive_rate, { "CCID3 Receive Rate", "dccp.ccid3_receive_rate", FT_UINT32, BASE_DEC|BASE_UNIT_STRING, &units_bytes_sec, 0x0, NULL, HFILL }},
|
|
{ &hf_dccp_option_reserved, { "Reserved", "dccp.option_reserved", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_dccp_ccid_option_data, { "CCID option", "dccp.ccid_option_data", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
{ &hf_dccp_option_unknown, { "Unknown", "dccp.option_unknown", FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_dccp,
|
|
&ett_dccp_options,
|
|
&ett_dccp_options_item,
|
|
&ett_dccp_feature
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_dccp_option_len_bad, { "dccp.option.len.bad", PI_PROTOCOL, PI_WARN, "Bad option length", EXPFILL }},
|
|
{ &ei_dccp_advertised_header_length_bad, { "dccp.advertised_header_length.bad", PI_MALFORMED, PI_ERROR, "Advertised header length bad", EXPFILL }},
|
|
{ &ei_dccp_packet_type_reserved, { "dccp.packet_type.reserved", PI_PROTOCOL, PI_WARN, "Reserved packet type: unable to dissect further", EXPFILL }},
|
|
{ &ei_dccp_checksum, { "dccp.bad_checksum", PI_CHECKSUM, PI_ERROR, "Bad checksum", EXPFILL }},
|
|
};
|
|
|
|
expert_module_t* expert_dccp;
|
|
|
|
proto_dccp =
|
|
proto_register_protocol("Datagram Congestion Control Protocol", "DCCP",
|
|
"dccp");
|
|
proto_register_field_array(proto_dccp, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
expert_dccp = expert_register_protocol(proto_dccp);
|
|
expert_register_field_array(expert_dccp, ei, array_length(ei));
|
|
|
|
/* subdissectors */
|
|
dccp_subdissector_table =
|
|
register_dissector_table("dccp.port", "DCCP port", proto_dccp, FT_UINT16,
|
|
BASE_DEC);
|
|
heur_subdissector_list = register_heur_dissector_list("dccp", proto_dccp);
|
|
|
|
/* reg preferences */
|
|
dccp_module = prefs_register_protocol(proto_dccp, NULL);
|
|
/* For reading older preference files with "dcp." preferences */
|
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prefs_register_module_alias("dcp", dccp_module);
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prefs_register_bool_preference(
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dccp_module, "summary_in_tree",
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"Show DCCP summary in protocol tree",
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"Whether the DCCP summary line should be shown in the protocol tree",
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&dccp_summary_in_tree);
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|
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prefs_register_bool_preference(
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dccp_module, "try_heuristic_first",
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"Try heuristic sub-dissectors first",
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"Try to decode a packet using an heuristic sub-dissector before "
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"using a sub-dissector "
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|
"registered to a specific port",
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&try_heuristic_first);
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|
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prefs_register_bool_preference(
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dccp_module, "check_checksum",
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"Check the validity of the DCCP checksum when possible",
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|
"Whether to check the validity of the DCCP checksum",
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&dccp_check_checksum);
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|
|
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prefs_register_bool_preference(
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dccp_module, "relative_sequence_numbers",
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|
"Relative sequence numbers",
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|
"Make the DCCP dissector use relative sequence numbers instead of absolute ones.",
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|
&dccp_relative_seq);
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|
|
|
register_conversation_table(proto_dccp, FALSE, dccpip_conversation_packet, dccpip_hostlist_packet);
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register_conversation_filter("dccp", "DCCP", dccp_filter_valid, dccp_build_filter);
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|
register_follow_stream(proto_dccp, "dccp_follow", dccp_follow_conv_filter, dccp_follow_index_filter, dccp_follow_address_filter,
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|
dccp_port_to_display, follow_tvb_tap_listener);
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|
|
|
register_init_routine(dccp_init);
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|
}
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|
|
|
void
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|
proto_reg_handoff_dccp(void)
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|
{
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|
dissector_handle_t dccp_handle;
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|
|
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dccp_handle = create_dissector_handle(dissect_dccp, proto_dccp);
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dissector_add_uint("ip.proto", IP_PROTO_DCCP, dccp_handle);
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dccp_tap = register_tap("dccp");
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|
dccp_follow_tap = register_tap("dccp_follow");
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}
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|
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 4
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
*/
|