forked from osmocom/wireshark
1442 lines
52 KiB
C
1442 lines
52 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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* $Id$
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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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* Copied from packet-udp.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/* 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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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/addr_resolv.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/emem.h>
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#include "packet-ip.h"
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#include <epan/conversation.h>
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#include <epan/tap.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_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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/*
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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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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 value_string dccp_feature_options_vals[] = {
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{0x20, "Change L" },
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{0x21, "Confirm L"},
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{0x22, "Change R" },
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{0x23, "Confirm R"},
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{0, NULL }
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};
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static const value_string dccp_feature_numbers_vals[] = {
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{0x01, "CCID" },
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{0x02, "Allow Short Seqnums" },
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{0x03, "Sequence Window" },
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{0x04, "ECN Incapable" },
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{0x05, "Ack Ratio" },
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{0x06, "Send Ack Vector" },
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{0x07, "Send NDP Count" },
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{0x08, "Minimum Checksum Coverage"},
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{0x09, "Check Data Checksum" },
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{0xC0, "Send Loss Event Rate" }, /* CCID3, RFC 4342, 8.5 */
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{0, NULL }
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};
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static int proto_dccp = -1;
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static int dccp_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_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_bad = -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_ack_res = -1;
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static int hf_dccp_ack = -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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static int hf_dccp_malformed = -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 dissector_table_t dccp_subdissector_table;
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static heur_dissector_list_t heur_subdissector_list;
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static dissector_handle_t data_handle;
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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 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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next_tvb = tvb_new_subset_remaining(tvb, offset);
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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, PT_DCCP, sport,
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dport, 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, pinfo,
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tree, 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, 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_dissector(data_handle, next_tvb, pinfo, tree);
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}
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/*
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* decode a variable-length number of nbytes starting at offset. Based on
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* a concept by Arnaldo de Melo
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*/
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static guint64
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tvb_get_ntoh_var(tvbuff_t *tvb, gint offset, guint nbytes)
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{
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const guint8 *ptr;
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guint64 value = 0;
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ptr = tvb_get_ptr(tvb, offset, nbytes);
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if (nbytes > 5)
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value += ((guint64) * ptr++) << 40;
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if (nbytes > 4)
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value += ((guint64) * ptr++) << 32;
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if (nbytes > 3)
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value += ((guint64) * ptr++) << 24;
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if (nbytes > 2)
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value += ((guint64) * ptr++) << 16;
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if (nbytes > 1)
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value += ((guint64) * ptr++) << 8;
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if (nbytes > 0)
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value += *ptr;
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return value;
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}
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static void
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dissect_feature_options(proto_tree *dccp_options_tree, tvbuff_t *tvb,
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int offset, guint8 option_len,
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guint8 option_type)
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{
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guint8 feature_number = tvb_get_guint8(tvb, offset + 2);
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proto_item *dccp_item, *hidden_item;
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int i;
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hidden_item =
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proto_tree_add_uint(dccp_options_tree, hf_dccp_feature_number, tvb,
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offset + 2, 1, feature_number);
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PROTO_ITEM_SET_HIDDEN(hidden_item);
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dccp_item =
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proto_tree_add_text(dccp_options_tree, tvb, offset, option_len, "%s(",
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val_to_str_const(option_type,
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dccp_feature_options_vals,
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"Unknown Type"));
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/*
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* decode the feature according to whether it is server-priority (list)
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* or NN (single number)
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*/
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switch (feature_number) {
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/* Server Priority features (RFC 4340, 6.3.1) */
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case 1: /* Congestion Control ID (CCID); fall through */
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case 2: /* Allow Short Seqnums; fall through */
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case 4: /* ECN Incapable; fall through */
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case 6: /* Send Ack Vector; fall through */
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case 7: /* Send NDP Count; fall through */
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case 8: /* Minimum Checksum Coverage; fall through */
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case 9: /* Check Data Checksum; fall through */
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case 192: /* Send Loss Event Rate, RFC 4342, section 8.4 */
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proto_item_append_text(dccp_item, "%s",
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val_to_str_const(feature_number,
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dccp_feature_numbers_vals,
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"Unknown Type"));
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for (i = 0; i < option_len - 3; i++)
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proto_item_append_text(dccp_item, "%s %d", i ? "," : "",
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tvb_get_guint8(tvb,
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offset + 3 + i));
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break;
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/* Non-negotiable features (RFC 4340, 6.3.2) */
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case 3: /* Sequence Window; fall through */
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case 5: /* Ack Ratio */
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proto_item_append_text(dccp_item, "%s",
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val_to_str_const(feature_number,
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dccp_feature_numbers_vals,
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"Unknown Type"));
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if (option_len > 3) /* could be empty Confirm */
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proto_item_append_text(dccp_item, " %" G_GINT64_MODIFIER "u",
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tvb_get_ntoh_var(tvb, offset + 3,
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option_len - 3));
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break;
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/* Reserved, specific, or unknown features */
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default:
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if (feature_number == 0 ||
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(feature_number >= 10 && feature_number <= 127))
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proto_item_append_text(dccp_item, "Reserved feature number %d",
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feature_number);
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else if (feature_number >= 193)
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proto_item_append_text(dccp_item, "CCID-specific feature number %d",
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feature_number);
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else
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proto_item_append_text(dccp_item, "Unknown feature number %d",
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feature_number);
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break;
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}
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proto_item_append_text(dccp_item, ")");
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}
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/*
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* This function dissects DCCP options
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*/
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static void
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dissect_options(tvbuff_t *tvb, packet_info *pinfo _U_,
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proto_tree *dccp_options_tree, proto_tree *tree _U_,
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e_dccphdr *dccph _U_,
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int offset_start,
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int offset_end)
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{
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/*
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* if here I'm sure there is at least offset_end - offset_start bytes
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* in tvb and it should be options
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*/
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int offset = offset_start;
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guint8 option_type = 0;
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guint8 option_len = 0;
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int i;
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guint32 p;
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proto_item *dccp_item = NULL;
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proto_item *hidden_item;
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while (offset < offset_end) {
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/* first byte is the option type */
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option_type = tvb_get_guint8(tvb, offset);
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hidden_item =
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proto_tree_add_uint(dccp_options_tree, hf_dccp_option_type, tvb,
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offset,
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1,
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option_type);
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PROTO_ITEM_SET_HIDDEN(hidden_item);
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if (option_type >= 32) { /* variable length options */
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if (!tvb_bytes_exist(tvb, offset, 1)) {
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hidden_item =
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proto_tree_add_boolean(dccp_options_tree, hf_dccp_malformed,
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tvb, offset, 0, TRUE);
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PROTO_ITEM_SET_HIDDEN(hidden_item);
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THROW(ReportedBoundsError);
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}
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option_len = tvb_get_guint8(tvb, offset + 1);
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|
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if (option_len < 2) {
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hidden_item =
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proto_tree_add_boolean(dccp_options_tree, hf_dccp_malformed,
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tvb, offset, 0, TRUE);
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PROTO_ITEM_SET_HIDDEN(hidden_item);
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THROW(ReportedBoundsError);
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}
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|
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if (!tvb_bytes_exist(tvb, offset, option_len)) {
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hidden_item =
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proto_tree_add_boolean(dccp_options_tree, hf_dccp_malformed,
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tvb, offset, 0, TRUE);
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PROTO_ITEM_SET_HIDDEN(hidden_item);
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THROW(ReportedBoundsError);
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}
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} else { /* 1byte options */
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option_len = 1;
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}
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|
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switch (option_type) {
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case 0:
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proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
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"Padding");
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break;
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case 1:
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proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
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"Mandatory");
|
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break;
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case 2:
|
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proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
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"Slow Receiver");
|
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break;
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case 32:
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case 33:
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case 34:
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case 35:
|
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dissect_feature_options(dccp_options_tree, tvb, offset, option_len,
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option_type);
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break;
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case 36:
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dccp_item =
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proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
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"Init Cookie(");
|
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for (i = 0; i < option_len - 2; i++) {
|
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if (i == 0)
|
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proto_item_append_text(dccp_item, "%02x",
|
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tvb_get_guint8(tvb, offset + 2 + i));
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else
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proto_item_append_text(dccp_item, " %02x",
|
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tvb_get_guint8(tvb, offset + 2 + i));
|
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}
|
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proto_item_append_text(dccp_item, ")");
|
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break;
|
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case 37:
|
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if (option_len > 8)
|
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proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
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"NDP Count too long (max 6 bytes)");
|
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else
|
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proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
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"NDP Count: %" G_GINT64_MODIFIER "u",
|
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tvb_get_ntoh_var(tvb, offset + 2,
|
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option_len - 2));
|
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break;
|
|
case 38:
|
|
dccp_item =
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"Ack Vector [Nonce 0]:");
|
|
for (i = 0; i < option_len - 2; i++)
|
|
proto_item_append_text(dccp_item, " %02x",
|
|
tvb_get_guint8(tvb, offset + 2 + i));
|
|
break;
|
|
case 39:
|
|
dccp_item =
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"Ack Vector [Nonce 1]:");
|
|
for (i = 0; i < option_len - 2; i++)
|
|
proto_item_append_text(dccp_item, " %02x",
|
|
tvb_get_guint8(tvb, offset + 2 + i));
|
|
proto_item_append_text(dccp_item, ")");
|
|
break;
|
|
case 40:
|
|
dccp_item =
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"Data Dropped:");
|
|
for (i = 0; i < option_len - 2; i++)
|
|
proto_item_append_text(dccp_item, " %02x",
|
|
tvb_get_guint8(tvb, offset + 2 + i));
|
|
break;
|
|
case 41:
|
|
if (option_len == 6)
|
|
proto_tree_add_uint(dccp_options_tree, hf_dccp_timestamp, tvb,
|
|
offset + 2, 4,
|
|
tvb_get_ntohl(tvb, offset + 2));
|
|
else
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"Timestamp too long [%u != 6]", option_len);
|
|
break;
|
|
case 42:
|
|
if (option_len == 6)
|
|
proto_tree_add_uint(dccp_options_tree, hf_dccp_timestamp_echo,
|
|
tvb, offset + 2, 4,
|
|
tvb_get_ntohl(tvb, offset + 2));
|
|
else if (option_len == 8) {
|
|
proto_tree_add_uint(dccp_options_tree, hf_dccp_timestamp_echo,
|
|
tvb, offset + 2, 4,
|
|
tvb_get_ntohl(tvb, offset + 2));
|
|
proto_tree_add_uint(dccp_options_tree, hf_dccp_elapsed_time,
|
|
tvb, offset + 6, 2,
|
|
tvb_get_ntohs(tvb, offset + 6));
|
|
} else if (option_len == 10) {
|
|
proto_tree_add_uint(dccp_options_tree, hf_dccp_timestamp_echo,
|
|
tvb, offset + 2, 4,
|
|
tvb_get_ntohl(tvb, offset + 2));
|
|
proto_tree_add_uint(dccp_options_tree, hf_dccp_elapsed_time,
|
|
tvb, offset + 6, 4,
|
|
tvb_get_ntohl(tvb, offset + 6));
|
|
} else
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"Wrong Timestamp Echo length");
|
|
break;
|
|
case 43:
|
|
if (option_len == 4)
|
|
proto_tree_add_uint(dccp_options_tree, hf_dccp_elapsed_time,
|
|
tvb, offset + 2, 2,
|
|
tvb_get_ntohs(tvb, offset + 2));
|
|
else if (option_len == 6)
|
|
proto_tree_add_uint(dccp_options_tree, hf_dccp_elapsed_time,
|
|
tvb, offset + 2, 4,
|
|
tvb_get_ntohl(tvb, offset + 2));
|
|
else
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"Wrong Elapsed Time length");
|
|
break;
|
|
case 44:
|
|
if (option_len == 6) {
|
|
proto_tree_add_uint(dccp_options_tree, hf_dccp_data_checksum,
|
|
tvb, offset + 2, 4,
|
|
tvb_get_ntohl(tvb, offset + 2));
|
|
} else
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"Wrong Data checksum length");
|
|
break;
|
|
case 192: /* RFC 4342, 8.5 */
|
|
if (option_len == 6) {
|
|
p = tvb_get_ntohl(tvb, offset + 2);
|
|
/*
|
|
* According to the comment in section 8.5 of RFC 4342,
|
|
* 0xffffffff can mean zero
|
|
*/
|
|
if (p == 0xFFFFFFFF)
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset,
|
|
option_len,
|
|
"CCID3 Loss Event Rate: 0 (or max)");
|
|
else
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset,
|
|
option_len, "CCID3 Loss Event Rate: %u",
|
|
p);
|
|
} else
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"Wrong CCID3 Loss Event Rate length");
|
|
break;
|
|
case 193: /* RFC 4342, 8.6 */
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"CCID3 Loss Intervals");
|
|
/*
|
|
* FIXME: not implemented and apparently not used by any
|
|
* implementation so far
|
|
*/
|
|
break;
|
|
case 194: /* RFC 4342, 8.3 */
|
|
if (option_len == 6)
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"CCID3 Receive Rate: %u bytes/sec",
|
|
tvb_get_ntohl(tvb, offset + 2));
|
|
else
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"Wrong CCID3 Receive Rate length");
|
|
break;
|
|
default:
|
|
if (((option_type >= 45) && (option_type <= 127)) ||
|
|
((option_type >= 3) && (option_type <= 31))) {
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"Reserved");
|
|
break;
|
|
}
|
|
|
|
if (option_type >= 128) {
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"CCID option %d",
|
|
option_type);
|
|
break;
|
|
}
|
|
|
|
/* if here we don't know this option */
|
|
proto_tree_add_text(dccp_options_tree, tvb, offset, option_len,
|
|
"Unknown");
|
|
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 void
|
|
dissect_dccp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_tree *dccp_tree = NULL;
|
|
proto_tree *dccp_options_tree = NULL;
|
|
proto_item *dccp_item = NULL;
|
|
proto_item *hidden_item;
|
|
|
|
vec_t cksum_vec[4];
|
|
guint32 phdr[2];
|
|
guint16 computed_cksum;
|
|
guint offset = 0;
|
|
guint len = 0;
|
|
guint reported_len = 0;
|
|
guint advertised_dccp_header_len = 0;
|
|
guint options_len = 0;
|
|
e_dccphdr *dccph;
|
|
|
|
/* get at least a full message header */
|
|
if (tvb_length(tvb) < DCCP_HDR_LEN_MIN) {
|
|
if (tree) {
|
|
hidden_item =
|
|
proto_tree_add_boolean(dccp_tree, hf_dccp_malformed, tvb,
|
|
offset, 0, TRUE);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
}
|
|
col_set_str(pinfo->cinfo, COL_INFO, "Packet too short");
|
|
THROW(ReportedBoundsError);
|
|
}
|
|
|
|
dccph = ep_alloc0(sizeof (e_dccphdr));
|
|
|
|
SET_ADDRESS(&dccph->ip_src, pinfo->src.type, pinfo->src.len,
|
|
pinfo->src.data);
|
|
SET_ADDRESS(&dccph->ip_dst, pinfo->dst.type, pinfo->dst.len,
|
|
pinfo->dst.data);
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DCCP");
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
/* Extract generic header */
|
|
dccph->sport = tvb_get_ntohs(tvb, offset);
|
|
dccph->dport = tvb_get_ntohs(tvb, 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;
|
|
|
|
dccph->data_offset = tvb_get_guint8(tvb, offset + 4);
|
|
dccph->cscov = tvb_get_guint8(tvb, offset + 5) & 0x0F;
|
|
dccph->ccval = tvb_get_guint8(tvb, offset + 5) & 0xF0;
|
|
dccph->ccval >>= 4;
|
|
dccph->checksum = tvb_get_ntohs(tvb, offset + 6);
|
|
dccph->reserved1 = tvb_get_guint8(tvb, offset + 8) & 0xE0;
|
|
dccph->reserved1 >>= 5;
|
|
dccph->type = tvb_get_guint8(tvb, offset + 8) & 0x1E;
|
|
dccph->type >>= 1;
|
|
dccph->x = tvb_get_guint8(tvb, offset + 8) & 0x01;
|
|
|
|
if (dccph->x) {
|
|
if (tvb_length(tvb) < DCCP_HDR_LEN) { /* at least 16 bytes */
|
|
hidden_item =
|
|
proto_tree_add_boolean(dccp_tree, hf_dccp_malformed, tvb,
|
|
offset, 0, TRUE);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
THROW(ReportedBoundsError);
|
|
}
|
|
dccph->reserved2 = tvb_get_guint8(tvb, offset + 9);
|
|
|
|
dccph->seq = tvb_get_ntohs(tvb, offset + 10);
|
|
dccph->seq <<= 32;
|
|
dccph->seq += tvb_get_ntohl(tvb, offset + 12);
|
|
} else {
|
|
dccph->seq = tvb_get_guint8(tvb, offset + 9);
|
|
dccph->seq <<= 16;
|
|
dccph->seq += tvb_get_ntohs(tvb, offset + 10);
|
|
}
|
|
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"%s > %s [%s] Seq=%" G_GINT64_MODIFIER "u",
|
|
get_dccp_port(dccph->sport),
|
|
get_dccp_port(dccph->dport),
|
|
val_to_str_const(dccph->type, dccp_packet_type_vals, "Unknown Type"),
|
|
dccph->seq);
|
|
|
|
if (tree) {
|
|
if (dccp_summary_in_tree) {
|
|
dccp_item =
|
|
proto_tree_add_protocol_format(
|
|
tree, proto_dccp, tvb, offset, dccph->data_offset * 4,
|
|
"Datagram Congestion Control Protocol, Src Port: %s (%u),"
|
|
" Dst Port: %s (%u)"
|
|
" [%s] Seq=%" G_GINT64_MODIFIER "u",
|
|
get_dccp_port(dccph->sport), dccph->sport,
|
|
get_dccp_port(dccph->dport), dccph->dport,
|
|
val_to_str_const(dccph->type, dccp_packet_type_vals,
|
|
"Unknown Type"),
|
|
dccph->seq);
|
|
} else {
|
|
dccp_item = proto_tree_add_item(tree, proto_dccp, tvb, offset, 8,
|
|
ENC_NA);
|
|
}
|
|
|
|
dccp_tree = proto_item_add_subtree(dccp_item, ett_dccp);
|
|
|
|
proto_tree_add_uint_format_value(dccp_tree, hf_dccp_srcport, tvb,
|
|
offset, 2, dccph->sport,
|
|
"%s (%u)",
|
|
get_dccp_port(dccph->sport),
|
|
dccph->sport);
|
|
proto_tree_add_uint_format_value(dccp_tree, hf_dccp_dstport, tvb,
|
|
offset + 2, 2, dccph->dport,
|
|
"%s (%u)",
|
|
get_dccp_port(dccph->dport),
|
|
dccph->dport);
|
|
hidden_item =
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_port, tvb, offset, 2,
|
|
dccph->sport);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
hidden_item =
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_port, tvb, offset + 2, 2,
|
|
dccph->dport);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_data_offset, tvb, offset + 4, 1,
|
|
dccph->data_offset);
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_ccval, tvb, offset + 5, 1,
|
|
dccph->ccval);
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_cscov, tvb, offset + 5, 1,
|
|
dccph->cscov);
|
|
|
|
/*
|
|
* checksum analysis taken from packet-udp (difference: mandatory
|
|
* checksums in DCCP)
|
|
*/
|
|
reported_len = tvb_reported_length(tvb);
|
|
len = tvb_length(tvb);
|
|
|
|
if (!pinfo->fragmented && len >= reported_len) {
|
|
/* 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? */
|
|
if (dccp_check_checksum) {
|
|
/* Set up the fields of the pseudo-header. */
|
|
cksum_vec[0].ptr = pinfo->src.data;
|
|
cksum_vec[0].len = pinfo->src.len;
|
|
cksum_vec[1].ptr = pinfo->dst.data;
|
|
cksum_vec[1].len = pinfo->dst.len;
|
|
cksum_vec[2].ptr = (const guint8 *) &phdr;
|
|
switch (pinfo->src.type) {
|
|
case AT_IPv4:
|
|
phdr[0] = g_htonl((IP_PROTO_DCCP << 16) + reported_len);
|
|
cksum_vec[2].len = 4;
|
|
break;
|
|
case AT_IPv6:
|
|
phdr[0] = g_htonl(reported_len);
|
|
phdr[1] = g_htonl(IP_PROTO_DCCP);
|
|
cksum_vec[2].len = 8;
|
|
break;
|
|
|
|
default:
|
|
/* DCCP runs only atop IPv4 and IPv6... */
|
|
break;
|
|
}
|
|
cksum_vec[3].ptr = tvb_get_ptr(tvb, offset, len);
|
|
cksum_vec[3].len = dccp_csum_coverage(dccph, reported_len);
|
|
computed_cksum = in_cksum(&cksum_vec[0], 4);
|
|
if (computed_cksum == 0) {
|
|
proto_tree_add_uint_format_value(dccp_tree,
|
|
hf_dccp_checksum, tvb,
|
|
offset + 6, 2,
|
|
dccph->checksum,
|
|
"0x%04x [correct]",
|
|
dccph->checksum);
|
|
} else {
|
|
hidden_item =
|
|
proto_tree_add_boolean(dccp_tree, hf_dccp_checksum_bad,
|
|
tvb, offset + 6, 2, TRUE);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
proto_tree_add_uint_format_value(
|
|
dccp_tree, hf_dccp_checksum, tvb, offset + 6, 2,
|
|
dccph->checksum,
|
|
"0x%04x [incorrect, should be 0x%04x]",
|
|
dccph->checksum,
|
|
in_cksum_shouldbe(dccph->checksum, computed_cksum));
|
|
}
|
|
} else {
|
|
proto_tree_add_uint_format_value(dccp_tree, hf_dccp_checksum,
|
|
tvb,
|
|
offset + 6, 2, dccph->checksum,
|
|
"0x%04x", dccph->checksum);
|
|
}
|
|
} else {
|
|
proto_tree_add_uint_format_value(dccp_tree, hf_dccp_checksum, tvb,
|
|
offset + 6, 2, dccph->checksum,
|
|
"0x%04x", dccph->checksum);
|
|
}
|
|
|
|
hidden_item =
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_res1, tvb, offset + 8, 1,
|
|
dccph->reserved1);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_type, tvb, offset + 8, 1,
|
|
dccph->type);
|
|
proto_tree_add_boolean(dccp_tree, hf_dccp_x, tvb, offset + 8, 1,
|
|
dccph->x);
|
|
if (dccph->x) {
|
|
hidden_item =
|
|
proto_tree_add_uint(dccp_tree, hf_dccp_res2, tvb, offset + 9, 1,
|
|
dccph->reserved2);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_seq, tvb, offset + 10, 6,
|
|
dccph->seq);
|
|
} else {
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_seq, tvb, offset + 9, 3,
|
|
dccph->seq);
|
|
}
|
|
}
|
|
|
|
if (dccph->x)
|
|
offset += 16; /* move offset past the extended Generic header */
|
|
else
|
|
offset += 12; /* move offset past the not extended Generic header */
|
|
|
|
/* dissecting type dependant additional fields */
|
|
switch (dccph->type) {
|
|
case 0x0: /* DCCP-Request */
|
|
case 0xA: /* DCCP-Listen */
|
|
if (!tvb_bytes_exist(tvb, offset, 4)) { /* at least 4 byte */
|
|
if (tree)
|
|
proto_tree_add_text(dccp_tree, tvb, offset, -1,
|
|
"too short packet");
|
|
return;
|
|
}
|
|
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=%u)",
|
|
dccph->service_code);
|
|
offset += 4; /* move offset past the service code */
|
|
break;
|
|
case 0x1: /* DCCP-Response */
|
|
if (!tvb_bytes_exist(tvb, offset, 8)) { /* at least 8 byte */
|
|
if (tree)
|
|
proto_tree_add_text(dccp_tree, tvb, offset, -1,
|
|
"too short packet");
|
|
return;
|
|
}
|
|
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 (tree)
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_ack, tvb, offset + 2, 6,
|
|
dccph->ack);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO,
|
|
" (Ack=%" G_GINT64_MODIFIER "u)",
|
|
dccph->ack);
|
|
offset += 8; /* move offset past the Acknowledgement Number Subheader */
|
|
|
|
if (!tvb_bytes_exist(tvb, offset, 4)) { /* at least 4 byte */
|
|
if (tree)
|
|
proto_tree_add_text(dccp_tree, tvb, offset, -1,
|
|
"too short packet");
|
|
return;
|
|
}
|
|
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=%u)",
|
|
dccph->service_code);
|
|
|
|
offset += 4; /* move offset past the service code */
|
|
break;
|
|
case 0x2: /* DCCP-Data */
|
|
/* nothing to dissect */
|
|
break;
|
|
case 0x3: /* DCCP-Ack */
|
|
case 0x4: /* DCCP-DataAck */
|
|
if (dccph->x) {
|
|
if (!tvb_bytes_exist(tvb, offset, 8)) { /* at least 8 byte */
|
|
if (tree)
|
|
proto_tree_add_text(dccp_tree, tvb, offset, -1,
|
|
"too short packet");
|
|
return;
|
|
}
|
|
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 (tree)
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_ack, tvb, offset + 2,
|
|
6, dccph->ack);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO,
|
|
" (Ack=%" G_GINT64_MODIFIER "u)",
|
|
dccph->ack);
|
|
offset += 8; /* move offset past the Ack Number Subheader */
|
|
} else {
|
|
if (!tvb_bytes_exist(tvb, offset, 4)) { /* at least 4 byte */
|
|
if (tree)
|
|
proto_tree_add_text(dccp_tree, tvb, offset, -1,
|
|
"too short packet");
|
|
return;
|
|
}
|
|
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 (tree)
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_ack, tvb, offset + 1,
|
|
3, dccph->ack);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO,
|
|
" (Ack=%" G_GINT64_MODIFIER "u)", dccph->ack);
|
|
offset += 4; /* move offset past the Ack. Number Subheader */
|
|
}
|
|
break;
|
|
case 0x7: /* DCCP-Reset */
|
|
if (!tvb_bytes_exist(tvb, offset, 8)) { /* at least 8 byte */
|
|
if (tree)
|
|
proto_tree_add_text(dccp_tree, tvb, offset, -1,
|
|
"too short packet");
|
|
return;
|
|
}
|
|
|
|
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 (tree)
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_ack, tvb, offset + 2, 6,
|
|
dccph->ack);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO,
|
|
" (Ack=%" G_GINT64_MODIFIER "u)", dccph->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 (!tvb_bytes_exist(tvb, offset, 8)) { /* at least 8 byte */
|
|
if (tree)
|
|
proto_tree_add_text(dccp_tree, tvb, offset, -1,
|
|
"too short packet");
|
|
return;
|
|
}
|
|
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 (tree)
|
|
proto_tree_add_uint64(dccp_tree, hf_dccp_ack, tvb, offset + 2, 6,
|
|
dccph->ack);
|
|
col_append_fstr(pinfo->cinfo, COL_INFO,
|
|
" (Ack=%" G_GINT64_MODIFIER "u)", dccph->ack);
|
|
offset += 8; /* move offset past the Ack. Number Subheader */
|
|
break;
|
|
default:
|
|
if (tree)
|
|
proto_tree_add_text(
|
|
dccp_tree, tvb, offset, -1,
|
|
"Reserved packet type: unable to dissect further");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
/* it's time to do some checks */
|
|
advertised_dccp_header_len = dccph->data_offset * 4;
|
|
options_len = advertised_dccp_header_len - offset;
|
|
|
|
if (advertised_dccp_header_len > DCCP_HDR_LEN_MAX) {
|
|
if (tree)
|
|
proto_tree_add_text(
|
|
dccp_tree, tvb, 4, 2,
|
|
"bogus data offset, advertised header length (%d) is "
|
|
"larger than max (%d)",
|
|
advertised_dccp_header_len, DCCP_HDR_LEN_MAX);
|
|
return;
|
|
}
|
|
|
|
if (tvb_length(tvb) < advertised_dccp_header_len) {
|
|
if (tree)
|
|
proto_tree_add_text(
|
|
dccp_tree, tvb, offset, -1,
|
|
"too short packet: missing %d bytes of DCCP header",
|
|
advertised_dccp_header_len -
|
|
tvb_reported_length_remaining(tvb, offset));
|
|
return;
|
|
}
|
|
|
|
if (options_len > DCCP_OPT_LEN_MAX) {
|
|
if (tree) {
|
|
hidden_item =
|
|
proto_tree_add_boolean(dccp_tree, hf_dccp_malformed, tvb,
|
|
offset, 0, TRUE);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
}
|
|
THROW(ReportedBoundsError);
|
|
}
|
|
|
|
/*
|
|
* Dissecting Options (if here we have at least
|
|
* (advertised_dccp_header_len - offset) bytes of options)
|
|
*/
|
|
if (advertised_dccp_header_len == offset) {
|
|
; /* ok no options, no need to move the offset forward */
|
|
} else if (advertised_dccp_header_len < offset) {
|
|
if (tree) {
|
|
proto_tree_add_text(
|
|
dccp_tree, tvb, 4, 2,
|
|
"bogus data offset, advertised header length (%d) is "
|
|
"shorter than expected",
|
|
advertised_dccp_header_len);
|
|
hidden_item =
|
|
proto_tree_add_boolean(dccp_tree, hf_dccp_malformed, tvb,
|
|
offset, 0, TRUE);
|
|
PROTO_ITEM_SET_HIDDEN(hidden_item);
|
|
}
|
|
THROW(ReportedBoundsError);
|
|
} else {
|
|
if (dccp_tree) {
|
|
dccp_item =
|
|
proto_tree_add_none_format(dccp_tree, hf_dccp_options, tvb,
|
|
offset,
|
|
options_len, "Options: (%u bytes)",
|
|
options_len);
|
|
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 */
|
|
|
|
/* queuing tap data */
|
|
tap_queue_packet(dccp_tap, pinfo, dccph);
|
|
|
|
/* call sub-dissectors */
|
|
if (!pinfo->flags.in_error_pkt || tvb_length_remaining(tvb, offset) > 0)
|
|
decode_dccp_ports(tvb, offset, pinfo, tree, dccph->sport, dccph->dport);
|
|
}
|
|
|
|
void
|
|
proto_register_dccp(void)
|
|
{
|
|
module_t *dccp_module;
|
|
|
|
static hf_register_info hf[] = {
|
|
{
|
|
&hf_dccp_srcport,
|
|
{
|
|
"Source Port", "dccp.srcport",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_dstport,
|
|
{
|
|
"Destination Port", "dccp.dstport",
|
|
FT_UINT16, BASE_DEC, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_port,
|
|
{
|
|
"Source or Destination Port", "dccp.port",
|
|
FT_UINT16, 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_bad,
|
|
{
|
|
"Bad Checksum", "dccp.checksum_bad",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 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_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_service_code,
|
|
{
|
|
"Service Code", "dccp.service_code",
|
|
FT_UINT32, BASE_DEC, NULL, 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, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_feature_number,
|
|
{
|
|
"Feature Number", "dccp.feature_number",
|
|
FT_UINT8, BASE_DEC, NULL, 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_malformed,
|
|
{
|
|
"Malformed", "dccp.malformed",
|
|
FT_BOOLEAN, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL
|
|
}
|
|
},
|
|
{
|
|
&hf_dccp_options,
|
|
{
|
|
"Options", "dccp.options",
|
|
FT_NONE, BASE_NONE, NULL, 0x0,
|
|
"DCCP Options fields", HFILL
|
|
}
|
|
}
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_dccp,
|
|
&ett_dccp_options
|
|
};
|
|
|
|
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));
|
|
|
|
/* subdissectors */
|
|
dccp_subdissector_table =
|
|
register_dissector_table("dccp.port", "DCCP port", FT_UINT16,
|
|
BASE_DEC);
|
|
register_heur_dissector_list("dccp", &heur_subdissector_list);
|
|
|
|
/* reg preferences */
|
|
dccp_module = prefs_register_protocol(proto_dccp, NULL);
|
|
prefs_register_bool_preference(
|
|
dccp_module, "summary_in_tree",
|
|
"Show DCCP summary in protocol tree",
|
|
"Whether the DCCP summary line should be shown in the protocol tree",
|
|
&dccp_summary_in_tree);
|
|
|
|
prefs_register_bool_preference(
|
|
dccp_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",
|
|
&try_heuristic_first);
|
|
|
|
prefs_register_bool_preference(
|
|
dccp_module, "check_checksum",
|
|
"Check the validity of the DCCP checksum when possible",
|
|
"Whether to check the validity of the DCCP checksum",
|
|
&dccp_check_checksum);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_dccp(void)
|
|
{
|
|
dissector_handle_t dccp_handle;
|
|
|
|
dccp_handle = create_dissector_handle(dissect_dccp, proto_dccp);
|
|
dissector_add_uint("ip.proto", IP_PROTO_DCCP, dccp_handle);
|
|
data_handle = find_dissector("data");
|
|
dccp_tap = register_tap("dccp");
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://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:
|
|
*/
|