![Alexis La Goutte](/assets/img/avatar_default.png)
(Using sed : sed -i '/^ \* \$Id\$/,+1 d') Fix manually some typo (in export_object_dicom.c and crc16-plain.c) Change-Id: I4c1ae68d1c4afeace8cb195b53c715cf9e1227a8 Reviewed-on: https://code.wireshark.org/review/497 Reviewed-by: Anders Broman <a.broman58@gmail.com>
385 lines
13 KiB
C
385 lines
13 KiB
C
/* packet-rmt-fec.c
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* Reliable Multicast Transport (RMT)
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* FEC Building Block dissector
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* Copyright 2005, Stefano Pettini <spettini@users.sourceforge.net>
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*
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* Forward Error Correction (ALC):
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* -------------------------------
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*
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* The goal of the FEC building block is to describe functionality
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* directly related to FEC codes that is common to all reliable content
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* delivery IP multicast protocols, and to leave out any additional
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* functionality that is specific to particular protocols.
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*
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* References:
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* RFC 3452, Forward Error Correction Building Block
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* RFC 3695, Compact Forward Error Correction (FEC) Schemes
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* Simple XOR, Reed-Solomon, and Parity Check Matrix-based FEC Schemes draft-peltotalo-rmt-bb-fec-supp-xor-pcm-rs-00
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* IANA RMT FEC parameters (http://www.iana.org/assignments/rmt-fec-parameters)
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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#include <epan/wmem/wmem.h>
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#include "packet-rmt-common.h"
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void proto_register_rmt_fec(void);
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void proto_reg_handoff_rmt_fec(void);
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static int proto_rmt_fec = -1;
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static int hf_encoding_id = -1;
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static int hf_instance_id = -1;
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static int hf_sbn = -1;
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static int hf_sbn_with_mask = -1;
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static int hf_sbl = -1;
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static int hf_esi = -1;
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static int hf_esi_with_mask = -1;
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static int hf_fti_transfer_length = -1;
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static int hf_fti_encoding_symbol_length = -1;
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static int hf_fti_max_source_block_length = -1;
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static int hf_fti_max_number_encoding_symbols = -1;
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static int hf_fti_num_blocks = -1;
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static int hf_fti_num_subblocks = -1;
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static int hf_fti_alignment = -1;
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static int ett_main = -1;
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static expert_field ei_fec_encoding_id = EI_INIT;
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typedef struct fec_packet_data
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{
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guint8 instance_id;
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} fec_packet_data_t;
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/* String tables */
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const value_string string_fec_encoding_id[] =
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{
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{ 0, "Compact No-Code" },
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{ 1, "Raptor" },
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{ 2, "Reed-Solomon Codes over GF(2^^m)" },
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{ 3, "LDPC Staircase Codes" },
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{ 4, "LDPC Triangle Codes" },
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{ 5, "Reed-Solomon Codes over GF(2^^8)" },
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{ 6, "RaptorQ Code" },
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/* 7-127 Unassigned */
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{ 128, "Small Block, Large Block and Expandable FEC Codes" },
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{ 129, "Small Block Systematic FEC Codes" },
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{ 130, "Compact FEC Codes" },
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/* 131-255 Unassigned */
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{ 0, NULL }
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};
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/* Dissection */
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/* ---------- */
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/* Decode an EXT_FTI extension and fill FEC array */
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void fec_decode_ext_fti(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, int offset, guint8 encoding_id)
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{
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guint64 transfer_length;
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fec_packet_data_t *fec_data;
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guint8 instance_id = 0;
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proto_item *ti;
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if (encoding_id == 6){
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/* Raptor Q uses 40-bit transfer length */
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transfer_length = tvb_get_ntoh40(tvb, offset+2);
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}
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else {
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/* Decode 48-bit length field */
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transfer_length = tvb_get_ntoh48(tvb, offset+2);
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}
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if (encoding_id >= 128)
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{
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instance_id = (guint8) tvb_get_ntohs(tvb, offset+8);
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/* Decode FEC Instance ID */
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fec_data = wmem_new0(wmem_file_scope(), fec_packet_data_t);
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fec_data->instance_id = instance_id;
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p_add_proto_data(wmem_file_scope(), pinfo, proto_rmt_fec, 0, fec_data);
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}
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if (encoding_id == 6){
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/* Raptor Q uses 40-bit transfer length */
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proto_tree_add_uint64(tree, hf_fti_transfer_length, tvb, offset+2, 5, transfer_length);
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}
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else {
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proto_tree_add_uint64(tree, hf_fti_transfer_length, tvb, offset+2, 6, transfer_length);
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ti = proto_tree_add_item(tree, hf_instance_id, tvb, offset+8, 2, ENC_BIG_ENDIAN);
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if ((encoding_id < 128) && (instance_id != 0)) {
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expert_add_info(pinfo, ti, &ei_fec_encoding_id);
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}
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}
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switch (encoding_id)
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{
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case 1:
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proto_tree_add_item(tree, hf_fti_encoding_symbol_length, tvb, offset+10, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_fti_num_blocks, tvb, offset+12, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_fti_num_subblocks, tvb, offset+14, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_fti_alignment, tvb, offset+15, 1, ENC_BIG_ENDIAN);
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break;
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case 6:
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proto_tree_add_item(tree, hf_fti_encoding_symbol_length, tvb, offset+8, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_fti_num_blocks, tvb, offset+10, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_fti_num_subblocks, tvb, offset+11, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_fti_alignment, tvb, offset+13, 1, ENC_BIG_ENDIAN);
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break;
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case 0:
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case 2:
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case 128:
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case 130:
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proto_tree_add_item(tree, hf_fti_encoding_symbol_length, tvb, offset+10, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_fti_max_source_block_length, tvb, offset+12, 4, ENC_BIG_ENDIAN);
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break;
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case 129:
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proto_tree_add_item(tree, hf_fti_encoding_symbol_length, tvb, offset+10, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_fti_max_source_block_length, tvb, offset+12, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_fti_max_number_encoding_symbols, tvb, offset+14, 2, ENC_BIG_ENDIAN);
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break;
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case 132:
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proto_tree_add_item(tree, hf_fti_encoding_symbol_length, tvb, offset+10, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_fti_max_source_block_length, tvb, offset+12, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(tree, hf_fti_max_number_encoding_symbols, tvb, offset+16, 4, ENC_BIG_ENDIAN);
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break;
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}
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}
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/* Dissect a FEC header:
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* fec - ptr to the logical FEC packet representation to fill
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* hf - ptr to header fields array
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* ett - ptr to ett array
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* prefs - ptr to FEC prefs array
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* tvb - buffer
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* pinfo - packet info
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* tree - tree where to add FEC header subtree
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* offset - ptr to offset to use and update
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*/
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static int
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dissect_fec(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
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{
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proto_item *ti;
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proto_tree *fec_tree;
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guint offset = 0;
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fec_data_exchange_t *fec = (fec_data_exchange_t*)data;
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guint8 encoding_id = 0;
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fec_packet_data_t *packet_data = (fec_packet_data_t*)p_get_proto_data(wmem_file_scope(), pinfo, proto_rmt_fec, 0);
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if (fec != NULL)
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{
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encoding_id = fec->encoding_id;
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}
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/* Create the FEC subtree */
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ti = proto_tree_add_item(tree, proto_rmt_fec, tvb, offset, -1, ENC_NA);
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fec_tree = proto_item_add_subtree(ti, ett_main);
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proto_tree_add_uint(fec_tree, hf_encoding_id, tvb, offset, 0, encoding_id);
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if (encoding_id >= 128 && (packet_data != NULL))
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proto_tree_add_uint(fec_tree, hf_instance_id, tvb, offset, 0, packet_data->instance_id);
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switch (encoding_id)
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{
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case 0:
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case 1:
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case 130:
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proto_tree_add_item(fec_tree, hf_sbn, tvb, offset, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(fec_tree, hf_esi, tvb, offset+2, 2, ENC_BIG_ENDIAN);
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "SBN: %u", tvb_get_ntohs(tvb, offset));
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "ESI: 0x%X", tvb_get_ntohs(tvb, offset+2));
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offset += 4;
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break;
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case 2:
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case 128:
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case 132:
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proto_tree_add_item(fec_tree, hf_sbn, tvb, offset, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(fec_tree, hf_esi, tvb, offset+4, 4, ENC_BIG_ENDIAN);
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "SBN: %u", tvb_get_ntohl(tvb, offset));
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "ESI: 0x%X", tvb_get_ntohl(tvb, offset+4));
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offset += 8;
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break;
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case 3:
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case 4:
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proto_tree_add_item(fec_tree, hf_sbn_with_mask, tvb, offset, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(fec_tree, hf_esi_with_mask, tvb, offset, 4, ENC_BIG_ENDIAN);
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "SBN: %u", tvb_get_ntohl(tvb, offset) >> 20);
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "ESI: 0x%X", tvb_get_ntohl(tvb, offset) & 0xfffff);
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offset += 4;
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break;
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case 6:
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proto_tree_add_item(fec_tree, hf_sbn, tvb, offset, 1, ENC_BIG_ENDIAN);
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proto_tree_add_item(fec_tree, hf_esi, tvb, offset+1, 3, ENC_BIG_ENDIAN);
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "SBN: %u", tvb_get_guint8(tvb, offset));
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "ESI: 0x%X", tvb_get_ntoh24(tvb, offset+1));
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offset += 4;
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break;
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case 129:
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proto_tree_add_item(fec_tree, hf_sbn, tvb, offset, 4, ENC_BIG_ENDIAN);
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proto_tree_add_item(fec_tree, hf_sbl, tvb, offset+4, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(fec_tree, hf_esi, tvb, offset+6, 2, ENC_BIG_ENDIAN);
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "SBN: %u", tvb_get_ntohl(tvb, offset));
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col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "ESI: 0x%X", tvb_get_ntohs(tvb, offset+6));
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offset += 8;
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break;
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}
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return offset;
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}
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void proto_register_rmt_fec(void)
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{
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static hf_register_info hf[] = {
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{ &hf_encoding_id,
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{ "FEC Encoding ID", "rmt-fec.encoding_id",
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FT_UINT8, BASE_DEC, VALS(string_fec_encoding_id), 0x0,
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NULL, HFILL }
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},
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{ &hf_instance_id,
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{ "FEC Instance ID", "rmt-fec.instance_id",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_sbn,
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{ "Source Block Number", "rmt-fec.sbn",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_sbn_with_mask,
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{ "Source Block Number", "rmt-fec.sbn",
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FT_UINT32, BASE_DEC, NULL, 0xFFF00000,
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NULL, HFILL }
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},
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{ &hf_sbl,
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{ "Source Block Length", "rmt-fec.sbl",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_esi,
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{ "Encoding Symbol ID", "rmt-fec.esi",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_esi_with_mask,
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{ "Encoding Symbol ID", "rmt-fec.esi",
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FT_UINT32, BASE_HEX, NULL, 0x000FFFFF,
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NULL, HFILL }
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},
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{ &hf_fti_transfer_length,
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{ "Transfer Length", "rmt-fec.fti.transfer_length",
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FT_UINT64, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_fti_encoding_symbol_length,
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{ "Encoding Symbol Length", "rmt-fec.fti.encoding_symbol_length",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_fti_max_source_block_length,
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{ "Maximum Source Block Length", "rmt-fec.fti.max_source_block_length",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_fti_max_number_encoding_symbols,
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{ "Maximum Number of Encoding Symbols", "rmt-fec.fti.max_number_encoding_symbols",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_fti_num_blocks,
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{ "Number of Source Blocks", "rmt-fec.fti.num_blocks",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_fti_num_subblocks,
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{ "Number of Sub-Blocks", "rmt-fec.fti.num_subblocks",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_fti_alignment,
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{ "Symbol Alignment", "rmt-fec.fti.alignment",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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}
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_main,
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};
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static ei_register_info ei[] = {
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{ &ei_fec_encoding_id, { "rmt-fec.encoding_id.not0", PI_PROTOCOL, PI_WARN, "FEC Encoding ID < 128, should be zero", EXPFILL }},
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};
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expert_module_t* expert_rmt_fec;
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/* Register the protocol name and description */
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proto_rmt_fec = proto_register_protocol("Forward Error Correction (FEC)", "RMT-FEC", "rmt-fec");
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new_register_dissector("rmt-fec", dissect_fec, proto_rmt_fec);
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array(proto_rmt_fec, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_rmt_fec = expert_register_protocol(proto_rmt_fec);
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expert_register_field_array(expert_rmt_fec, ei, array_length(ei));
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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