2011-12-26 23:00:33 +00:00
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/* Routines for UMTS MAC (3GPP TS 25.321) disassembly
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2009-10-09 06:37:48 +00:00
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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2012-05-07 16:41:03 +00:00
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#include <epan/conversation.h>
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2009-10-09 06:37:48 +00:00
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#include "packet-umts_fp.h"
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2012-05-28 20:11:59 +00:00
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#include "packet-rlc.h"
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2009-10-09 06:37:48 +00:00
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#include "packet-umts_mac.h"
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int proto_umts_mac = -1;
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extern int proto_fp;
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2012-05-28 20:11:59 +00:00
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extern int proto_rlc;
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2009-10-09 06:37:48 +00:00
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/* dissector fields */
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static int hf_mac_fach_fdd_tctf = -1;
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static int hf_mac_rach_fdd_tctf = -1;
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static int hf_mac_ct = -1;
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static int hf_mac_ueid_type = -1;
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static int hf_mac_crnti = -1;
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static int hf_mac_urnti = -1;
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static int hf_mac_channel = -1;
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/* subtrees */
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static int ett_mac = -1;
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static int ett_mac_fach = -1;
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static int ett_mac_rach = -1;
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static int ett_mac_dch = -1;
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static int ett_mac_pch = -1;
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static int ett_mac_edch = -1;
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static int ett_mac_hsdsch = -1;
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static dissector_handle_t rlc_pcch_handle;
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static dissector_handle_t rlc_ccch_handle;
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2011-04-16 12:22:16 +00:00
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static dissector_handle_t rlc_ctch_handle;
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2009-10-09 06:37:48 +00:00
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static dissector_handle_t rlc_dcch_handle;
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static dissector_handle_t rlc_ps_dtch_handle;
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static const value_string rach_fdd_tctf_vals[] = {
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2012-03-06 17:11:01 +00:00
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{ TCTF_CCCH_RACH_FDD , "CCCH over RACH (FDD)" },
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{ TCTF_DCCH_DTCH_RACH_FDD , "DCCH/DTCH over RACH (FDD)" },
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{ 0, NULL }
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2009-10-09 06:37:48 +00:00
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};
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static const value_string fach_fdd_tctf_vals[] = {
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2012-03-06 17:11:01 +00:00
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{ TCTF_BCCH_FACH_FDD , "BCCH over FACH (FDD)" },
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{ TCTF_DCCH_DTCH_FACH_FDD , "DCCH/DTCH over FACH (FDD)" },
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{ TCTF_MTCH_FACH_FDD , "MTCH over FACH (FDD)" },
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{ TCTF_CCCH_FACH_FDD , "CCCH over FACH (FDD)" },
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{ TCTF_MCCH_FACH_FDD , "MCCH over FACH (FDD)" },
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{ TCTF_MSCH_FACH_FDD , "MSCH over FACH (FDD)" },
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{ TCTF_CTCH_FACH_FDD , "CTCH over FACH (FDD)" },
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{ 0, NULL }
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2009-10-09 06:37:48 +00:00
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};
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static const value_string ueid_type_vals[] = {
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2012-03-06 17:11:01 +00:00
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{ MAC_UEID_TYPE_URNTI, "U-RNTI" },
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{ MAC_UEID_TYPE_CRNTI, "C-RNTI" },
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{ 0, NULL }
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2009-10-09 06:37:48 +00:00
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};
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2012-03-06 17:11:01 +00:00
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#define MAC_PCCH 0
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#define MAC_CCCH 1
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#define MAC_CTCH 2
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#define MAC_DCCH 3
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#define MAC_DTCH 4
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#define MAC_BCCH 5
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#define MAC_MCCH 6
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#define MAC_MSCH 7
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#define MAC_MTCH 8
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2009-10-09 06:37:48 +00:00
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static const value_string mac_logical_channel_vals[] = {
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2012-03-06 17:11:01 +00:00
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{ MAC_PCCH, "PCCH" },
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{ MAC_CCCH, "CCCH" },
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{ MAC_CTCH, "CTCH" },
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{ MAC_DCCH, "DCCH" },
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{ MAC_DTCH, "DTCH" },
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{ MAC_BCCH, "BCCH" },
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{ MAC_MCCH, "MCCH" },
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{ MAC_MSCH, "MSCH" },
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{ MAC_MTCH, "MTCH" },
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{ 0, NULL }
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2009-10-09 06:37:48 +00:00
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};
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static guint8 fach_fdd_tctf(guint8 hdr, guint16 *bit_offs)
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{
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2012-03-06 17:11:01 +00:00
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guint8 tctf;
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/* first, test for valid 2-bit combinations */
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tctf = hdr >> 6;
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switch (tctf) {
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case TCTF_BCCH_FACH_FDD:
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case TCTF_DCCH_DTCH_FACH_FDD:
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*bit_offs = 2;
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return tctf;
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}
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/* 4-bit combinations */
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tctf = hdr >> 4;
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switch (tctf) {
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case TCTF_MTCH_FACH_FDD:
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*bit_offs = 4;
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return tctf;
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}
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/* just return the 8-bit combination */
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*bit_offs = 8;
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tctf = hdr;
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switch (tctf) {
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case TCTF_CCCH_FACH_FDD:
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case TCTF_MCCH_FACH_FDD:
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case TCTF_MSCH_FACH_FDD:
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case TCTF_CTCH_FACH_FDD:
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return tctf;
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default:
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return tctf; /* TODO */
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}
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2009-10-09 06:37:48 +00:00
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}
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static guint16 tree_add_common_dcch_dtch_fields(tvbuff_t *tvb, packet_info *pinfo _U_,
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2012-05-28 20:11:59 +00:00
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proto_tree *tree, guint16 bitoffs, fp_info *fpinf, umts_mac_info *macinf, rlc_info *rlcinf)
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2009-10-09 06:37:48 +00:00
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{
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2012-03-06 17:11:01 +00:00
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guint8 ueid_type;
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ueid_type = tvb_get_bits8(tvb, bitoffs, 2);
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proto_tree_add_bits_item(tree, hf_mac_ueid_type, tvb, bitoffs, 2, ENC_BIG_ENDIAN);
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bitoffs += 2;
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if (ueid_type == MAC_UEID_TYPE_URNTI) {
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proto_tree_add_bits_item(tree, hf_mac_urnti, tvb, bitoffs, 32, ENC_BIG_ENDIAN);
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bitoffs += 32;
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} else if (ueid_type == MAC_UEID_TYPE_CRNTI) {
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proto_tree_add_bits_item(tree, hf_mac_crnti, tvb, 4, 16, ENC_BIG_ENDIAN);
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bitoffs += 16;
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}
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if (macinf->ctmux[fpinf->cur_tb]) {
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2012-05-28 20:11:59 +00:00
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if(rlcinf){
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rlcinf->rbid[fpinf->cur_tb] = tvb_get_bits8(tvb, bitoffs, 4);
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}
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2012-03-06 17:11:01 +00:00
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proto_tree_add_bits_item(tree, hf_mac_ct, tvb, bitoffs, 4, ENC_BIG_ENDIAN);
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bitoffs += 4;
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}
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return bitoffs;
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2009-10-09 06:37:48 +00:00
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}
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static void dissect_mac_fdd_pch(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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2012-03-06 17:11:01 +00:00
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proto_tree *pch_tree = NULL;
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proto_item *channel_type;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MAC");
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col_set_str(pinfo->cinfo, COL_INFO, "PCCH");
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if (tree) {
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proto_item *ti;
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ti = proto_tree_add_item(tree, proto_umts_mac, tvb, 0, -1, ENC_NA);
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pch_tree = proto_item_add_subtree(ti, ett_mac_pch);
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proto_item_append_text(ti, " (PCCH)");
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channel_type = proto_tree_add_uint(pch_tree, hf_mac_channel, tvb, 0, 0, MAC_PCCH);
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PROTO_ITEM_SET_GENERATED(channel_type);
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}
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call_dissector(rlc_pcch_handle, tvb, pinfo, tree);
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2009-10-09 06:37:48 +00:00
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}
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static void dissect_mac_fdd_rach(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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2012-03-06 17:11:01 +00:00
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guint8 tctf;
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guint8 chan;
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guint16 bitoffs = 0;
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tvbuff_t *next_tvb;
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proto_tree *rach_tree = NULL;
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proto_item *channel_type;
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umts_mac_info *macinf;
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fp_info *fpinf;
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2012-05-28 20:11:59 +00:00
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rlc_info *rlcinf;
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2012-03-06 17:11:01 +00:00
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proto_item *ti = NULL;
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/* RACH TCTF is always 2 bit */
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tctf = tvb_get_bits8(tvb, 0, 2);
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bitoffs += 2;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MAC");
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col_add_str(pinfo->cinfo, COL_INFO,
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val_to_str(tctf, rach_fdd_tctf_vals, "Unknown TCTF"));
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ti = proto_tree_add_item(tree, proto_umts_mac, tvb, 0, -1, ENC_NA);
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rach_tree = proto_item_add_subtree(ti, ett_mac_rach);
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macinf = p_get_proto_data(pinfo->fd, proto_umts_mac);
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fpinf = p_get_proto_data(pinfo->fd, proto_fp);
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2012-05-28 20:11:59 +00:00
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rlcinf = p_get_proto_data(pinfo->fd, proto_rlc);
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2012-03-06 17:11:01 +00:00
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if (!macinf || !fpinf) {
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proto_tree_add_text(rach_tree, tvb, 0, -1,
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"Cannot dissect MAC frame because per-frame info is missing");
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return;
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}
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proto_tree_add_bits_item(rach_tree, hf_mac_rach_fdd_tctf, tvb, 0, 2, ENC_BIG_ENDIAN);
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if (tctf == TCTF_DCCH_DTCH_RACH_FDD) {
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macinf->ctmux[fpinf->cur_tb] = 1; /* DCCH/DTCH on RACH *always* has a C/T */
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2012-05-28 20:11:59 +00:00
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bitoffs = tree_add_common_dcch_dtch_fields(tvb, pinfo, rach_tree, bitoffs, fpinf, macinf, rlcinf);
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2012-03-06 17:11:01 +00:00
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}
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chan = fpinf->cur_chan;
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/* handoff to next dissector */
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switch (tctf) {
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case TCTF_CCCH_RACH_FDD:
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proto_item_append_text(ti, " (CCCH)");
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channel_type = proto_tree_add_uint(rach_tree, hf_mac_channel, tvb, 0, 0, MAC_CCCH);
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PROTO_ITEM_SET_GENERATED(channel_type);
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next_tvb = tvb_new_octet_aligned(tvb, bitoffs, fpinf->chan_tf_size[chan] - bitoffs);
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add_new_data_source(pinfo, next_tvb, "Octet-Aligned CCCH Data");
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call_dissector(rlc_ccch_handle, next_tvb, pinfo, tree);
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break;
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case TCTF_DCCH_DTCH_RACH_FDD:
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switch (macinf->content[chan]) {
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case MAC_CONTENT_DCCH:
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proto_item_append_text(ti, " (DCCH)");
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channel_type = proto_tree_add_uint(rach_tree, hf_mac_channel, tvb, 0, 0, MAC_DCCH);
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PROTO_ITEM_SET_GENERATED(channel_type);
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next_tvb = tvb_new_octet_aligned(tvb, bitoffs, fpinf->chan_tf_size[chan] - bitoffs);
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add_new_data_source(pinfo, next_tvb, "Octet-Aligned DCCH Data");
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call_dissector(rlc_dcch_handle, next_tvb, pinfo, tree);
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break;
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case MAC_CONTENT_PS_DTCH:
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proto_item_append_text(ti, " (PS DTCH)");
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channel_type = proto_tree_add_uint(rach_tree, hf_mac_channel, tvb, 0, 0, MAC_DTCH);
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PROTO_ITEM_SET_GENERATED(channel_type);
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next_tvb = tvb_new_octet_aligned(tvb, bitoffs, fpinf->chan_tf_size[chan] - bitoffs);
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add_new_data_source(pinfo, next_tvb, "Octet-Aligned DTCH Data");
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call_dissector(rlc_ps_dtch_handle, next_tvb, pinfo, tree);
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break;
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case MAC_CONTENT_CS_DTCH:
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proto_item_append_text(ti, " (CS DTCH)");
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/* TODO */
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break;
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default:
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proto_item_append_text(ti, " (Unknown RACH DCCH/DTCH Content)");
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}
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break;
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default:
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proto_item_append_text(ti, " (Unknown RACH TCTF)");
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}
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2009-10-09 06:37:48 +00:00
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}
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static void dissect_mac_fdd_fach(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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2012-03-06 17:11:01 +00:00
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guint8 hdr, tctf;
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guint16 bitoffs = 0;
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guint16 tctf_len, chan;
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proto_tree *fach_tree = NULL;
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proto_item *channel_type;
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umts_mac_info *macinf;
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fp_info *fpinf;
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2012-05-28 20:11:59 +00:00
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rlc_info *rlcinf;
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2012-03-06 17:11:01 +00:00
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proto_item *ti = NULL;
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hdr = tvb_get_guint8(tvb, 0);
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/* get target channel type field */
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tctf = fach_fdd_tctf(hdr, &bitoffs);
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tctf_len = bitoffs;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "MAC");
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col_add_str(pinfo->cinfo, COL_INFO,
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val_to_str(tctf, fach_fdd_tctf_vals, "Unknown TCTF"));
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ti = proto_tree_add_item(tree, proto_umts_mac, tvb, 0, -1, ENC_NA);
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fach_tree = proto_item_add_subtree(ti, ett_mac_fach);
|
|
|
|
|
|
|
|
macinf = p_get_proto_data(pinfo->fd, proto_umts_mac);
|
|
|
|
fpinf = p_get_proto_data(pinfo->fd, proto_fp);
|
2012-05-28 20:11:59 +00:00
|
|
|
rlcinf = p_get_proto_data(pinfo->fd, proto_rlc);
|
2012-03-06 17:11:01 +00:00
|
|
|
if (!macinf || !fpinf) {
|
|
|
|
proto_tree_add_text(fach_tree, tvb, 0, -1,
|
|
|
|
"Cannot dissect MAC frame because per-frame info is missing");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
proto_tree_add_bits_item(fach_tree, hf_mac_fach_fdd_tctf, tvb, 0, tctf_len, ENC_BIG_ENDIAN);
|
|
|
|
if (tctf == TCTF_DCCH_DTCH_FACH_FDD) {
|
|
|
|
macinf->ctmux[fpinf->cur_tb] = 1; /* DCCH/DTCH on FACH *always* has a C/T */
|
2012-05-28 20:11:59 +00:00
|
|
|
bitoffs = tree_add_common_dcch_dtch_fields(tvb, pinfo, fach_tree, bitoffs, fpinf, macinf, rlcinf);
|
2012-03-06 17:11:01 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
chan = fpinf->cur_chan;
|
|
|
|
switch (tctf) {
|
|
|
|
tvbuff_t *next_tvb;
|
|
|
|
case TCTF_CCCH_FACH_FDD:
|
|
|
|
proto_item_append_text(ti, " (CCCH)");
|
|
|
|
channel_type = proto_tree_add_uint(fach_tree, hf_mac_channel, tvb, 0, 0, MAC_CCCH);
|
|
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
/* CCCH over FACH is always octet aligned */
|
|
|
|
next_tvb = tvb_new_subset(tvb, 1, tvb_length_remaining(tvb, 1), -1);
|
|
|
|
call_dissector(rlc_ccch_handle, next_tvb, pinfo, tree);
|
|
|
|
break;
|
|
|
|
case TCTF_DCCH_DTCH_FACH_FDD:
|
|
|
|
switch (macinf->content[fpinf->cur_tb]) {
|
|
|
|
case MAC_CONTENT_DCCH:
|
|
|
|
proto_item_append_text(ti, " (DCCH)");
|
|
|
|
channel_type = proto_tree_add_uint(fach_tree, hf_mac_channel, tvb, 0, 0, MAC_DCCH);
|
|
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
next_tvb = tvb_new_octet_aligned(tvb, bitoffs, fpinf->chan_tf_size[chan] - bitoffs);
|
|
|
|
add_new_data_source(pinfo, next_tvb, "Octet-Aligned DCCH Data");
|
|
|
|
call_dissector(rlc_dcch_handle, next_tvb, pinfo, tree);
|
|
|
|
break;
|
|
|
|
case MAC_CONTENT_PS_DTCH:
|
|
|
|
proto_item_append_text(ti, " (PS DTCH)");
|
|
|
|
channel_type = proto_tree_add_uint(fach_tree, hf_mac_channel, tvb, 0, 0, MAC_DTCH);
|
|
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
next_tvb = tvb_new_octet_aligned(tvb, bitoffs, fpinf->chan_tf_size[chan] - bitoffs);
|
|
|
|
add_new_data_source(pinfo, next_tvb, "Octet-Aligned DCCH Data");
|
|
|
|
call_dissector(rlc_ps_dtch_handle, next_tvb, pinfo, tree);
|
|
|
|
break;
|
|
|
|
case MAC_CONTENT_CS_DTCH:
|
|
|
|
proto_item_append_text(ti, " (CS DTCH)");
|
|
|
|
/* TODO */
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
proto_item_append_text(ti, " (Unknown FACH Content");
|
|
|
|
}
|
|
|
|
break;
|
2011-04-16 12:22:16 +00:00
|
|
|
case TCTF_CTCH_FACH_FDD:
|
|
|
|
proto_item_append_text(ti, " (CTCH)");
|
|
|
|
channel_type = proto_tree_add_uint(fach_tree, hf_mac_channel, tvb, 0, 0, MAC_CTCH);
|
|
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
/* CTCH over FACH is always octet aligned */
|
|
|
|
next_tvb = tvb_new_subset(tvb, 1, tvb_length_remaining(tvb, 1), -1);
|
|
|
|
call_dissector(rlc_ctch_handle, next_tvb, pinfo, tree);
|
|
|
|
break;
|
2012-03-06 17:11:01 +00:00
|
|
|
default:
|
2011-04-16 12:22:16 +00:00
|
|
|
proto_item_append_text(ti, " (Unknown FACH Content)");
|
2012-03-06 17:11:01 +00:00
|
|
|
}
|
2009-10-09 06:37:48 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void dissect_mac_fdd_dch(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
|
|
{
|
2012-03-06 17:11:01 +00:00
|
|
|
guint16 pos;
|
|
|
|
guint8 bitoffs = 0;
|
|
|
|
umts_mac_info *macinf;
|
|
|
|
fp_info *fpinf;
|
2012-05-28 20:11:59 +00:00
|
|
|
rlc_info *rlcinf;
|
2012-03-06 17:11:01 +00:00
|
|
|
proto_tree *dch_tree = NULL;
|
|
|
|
proto_item *channel_type;
|
|
|
|
tvbuff_t *next_tvb;
|
|
|
|
proto_item *ti = NULL;
|
|
|
|
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MAC");
|
|
|
|
|
|
|
|
ti = proto_tree_add_item(tree, proto_umts_mac, tvb, 0, -1, ENC_NA);
|
|
|
|
dch_tree = proto_item_add_subtree(ti, ett_mac_dch);
|
|
|
|
|
|
|
|
macinf = p_get_proto_data(pinfo->fd, proto_umts_mac);
|
|
|
|
fpinf = p_get_proto_data(pinfo->fd, proto_fp);
|
2012-05-28 20:11:59 +00:00
|
|
|
rlcinf = p_get_proto_data(pinfo->fd, proto_rlc);
|
2012-03-06 17:11:01 +00:00
|
|
|
if (!macinf || !fpinf) {
|
|
|
|
proto_tree_add_text(dch_tree, tvb, 0, -1,
|
|
|
|
"Cannot dissect MAC frame because per-frame info is missing");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
pos = fpinf->cur_tb;
|
|
|
|
if (macinf->ctmux[pos]) {
|
2012-05-28 20:11:59 +00:00
|
|
|
if(rlcinf){
|
|
|
|
rlcinf->rbid[fpinf->cur_tb] = tvb_get_bits8(tvb, bitoffs, 4);
|
|
|
|
}
|
2012-03-06 17:11:01 +00:00
|
|
|
proto_tree_add_bits_item(dch_tree, hf_mac_ct, tvb, 0, 4, ENC_BIG_ENDIAN);
|
|
|
|
bitoffs = 4;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (bitoffs) {
|
|
|
|
next_tvb = tvb_new_octet_aligned(tvb, bitoffs, fpinf->chan_tf_size[pos] - bitoffs);
|
|
|
|
add_new_data_source(pinfo, next_tvb, "Octet-Aligned DCCH Data");
|
|
|
|
} else
|
|
|
|
next_tvb = tvb;
|
|
|
|
switch (macinf->content[pos]) {
|
|
|
|
case MAC_CONTENT_DCCH:
|
|
|
|
proto_item_append_text(ti, " (DCCH)");
|
|
|
|
channel_type = proto_tree_add_uint(dch_tree, hf_mac_channel, tvb, 0, 0, MAC_DCCH);
|
|
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
call_dissector(rlc_dcch_handle, next_tvb, pinfo, tree);
|
|
|
|
break;
|
|
|
|
case MAC_CONTENT_PS_DTCH:
|
|
|
|
proto_item_append_text(ti, " (PS DTCH)");
|
|
|
|
channel_type = proto_tree_add_uint(dch_tree, hf_mac_channel, tvb, 0, 0, MAC_DTCH);
|
|
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
call_dissector(rlc_ps_dtch_handle, next_tvb, pinfo, tree);
|
|
|
|
break;
|
|
|
|
case MAC_CONTENT_CS_DTCH:
|
|
|
|
proto_item_append_text(ti, " (CS DTCH)");
|
|
|
|
/* TODO */
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
proto_item_append_text(ti, " (Unknown DCH Content)");
|
|
|
|
;
|
|
|
|
}
|
2009-10-09 06:37:48 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void dissect_mac_fdd_edch(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
|
|
{
|
2012-03-06 17:11:01 +00:00
|
|
|
proto_tree *edch_tree = NULL;
|
|
|
|
proto_item *channel_type;
|
|
|
|
umts_mac_info *macinf;
|
|
|
|
fp_info *fpinf;
|
|
|
|
guint16 pos;
|
|
|
|
proto_item *ti = NULL;
|
|
|
|
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MAC");
|
|
|
|
|
|
|
|
ti = proto_tree_add_item(tree, proto_umts_mac, tvb, 0, -1, ENC_NA);
|
|
|
|
edch_tree = proto_item_add_subtree(ti, ett_mac_edch);
|
|
|
|
|
|
|
|
fpinf = p_get_proto_data(pinfo->fd, proto_fp);
|
|
|
|
macinf = p_get_proto_data(pinfo->fd, proto_umts_mac);
|
|
|
|
pos = fpinf->cur_tb;
|
2012-05-29 14:34:34 +00:00
|
|
|
if (!macinf|| !fpinf) {
|
2012-03-06 17:11:01 +00:00
|
|
|
proto_tree_add_text(edch_tree, tvb, 0, -1,
|
|
|
|
"Cannot dissect MAC frame because per-frame info is missing");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (macinf->content[pos]) {
|
|
|
|
case MAC_CONTENT_DCCH:
|
|
|
|
proto_item_append_text(ti, " (DCCH)");
|
|
|
|
channel_type = proto_tree_add_uint(edch_tree, hf_mac_channel, tvb, 0, 0, MAC_DCCH);
|
|
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
call_dissector(rlc_dcch_handle, tvb, pinfo, tree);
|
|
|
|
break;
|
|
|
|
case MAC_CONTENT_PS_DTCH:
|
|
|
|
proto_item_append_text(ti, " (PS DTCH)");
|
|
|
|
channel_type = proto_tree_add_uint(edch_tree, hf_mac_channel, tvb, 0, 0, MAC_DTCH);
|
|
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
call_dissector(rlc_ps_dtch_handle, tvb, pinfo, tree);
|
|
|
|
break;
|
|
|
|
case MAC_CONTENT_CS_DTCH:
|
|
|
|
proto_item_append_text(ti, " (CS DTCH)");
|
|
|
|
/* TODO */
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
proto_item_append_text(ti, " (Unknown EDCH Content)");
|
|
|
|
}
|
2009-10-09 06:37:48 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
/* to avoid unnecessary re-alignment, the 4 bit padding prepended to the HSDSCH in FP
|
|
|
|
* are handled in the MAC layer
|
|
|
|
* If the C/T field is present, 'bitoffs' will be 8 (4 bit padding and 4 bit C/T) and
|
|
|
|
* no re-alignment is necessary
|
|
|
|
* If no C/T is present, the whole payload will be left-shifted by 4 bit
|
|
|
|
*/
|
|
|
|
static void dissect_mac_fdd_hsdsch(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
|
|
{
|
2012-03-06 17:11:01 +00:00
|
|
|
proto_tree *hsdsch_tree = NULL;
|
|
|
|
proto_item *channel_type;
|
|
|
|
fp_info *fpinf;
|
|
|
|
umts_mac_info *macinf;
|
|
|
|
guint16 pos;
|
|
|
|
guint8 bitoffs;
|
|
|
|
tvbuff_t *next_tvb;
|
|
|
|
proto_item *ti = NULL;
|
|
|
|
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "MAC");
|
|
|
|
|
|
|
|
ti = proto_tree_add_item(tree, proto_umts_mac, tvb, 0, -1, ENC_NA);
|
|
|
|
hsdsch_tree = proto_item_add_subtree(ti, ett_mac_hsdsch);
|
|
|
|
|
|
|
|
fpinf = p_get_proto_data(pinfo->fd, proto_fp);
|
|
|
|
macinf = p_get_proto_data(pinfo->fd, proto_umts_mac);
|
|
|
|
pos = fpinf->cur_tb;
|
|
|
|
bitoffs = fpinf->hsdsch_entity == ehs ? 0 : 4;
|
|
|
|
|
|
|
|
if (!macinf) {
|
|
|
|
proto_tree_add_text(hsdsch_tree, tvb, 0, -1,
|
|
|
|
"Cannot dissect MAC frame because per-frame info is missing");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if (macinf->ctmux[pos]) {
|
|
|
|
proto_tree_add_bits_item(hsdsch_tree, hf_mac_ct, tvb, 0, 4, ENC_BIG_ENDIAN);
|
|
|
|
bitoffs += 4;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ((bitoffs % 8) == 0) {
|
|
|
|
next_tvb = tvb_new_subset_remaining(tvb, bitoffs/8);
|
|
|
|
} else {
|
|
|
|
next_tvb = tvb_new_octet_aligned(tvb, bitoffs, -1);
|
|
|
|
add_new_data_source(pinfo, next_tvb, "Octet-Aligned HSDSCH Data");
|
|
|
|
}
|
|
|
|
switch (macinf->content[pos]) {
|
|
|
|
case MAC_CONTENT_DCCH:
|
|
|
|
proto_item_append_text(ti, " (DCCH)");
|
|
|
|
channel_type = proto_tree_add_uint(hsdsch_tree, hf_mac_channel, tvb, 0, 0, MAC_DCCH);
|
|
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
call_dissector(rlc_dcch_handle, next_tvb, pinfo, tree);
|
|
|
|
break;
|
|
|
|
case MAC_CONTENT_PS_DTCH:
|
|
|
|
proto_item_append_text(ti, " (PS DTCH)");
|
|
|
|
channel_type = proto_tree_add_uint(hsdsch_tree, hf_mac_channel, tvb, 0, 0, MAC_DTCH);
|
|
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
call_dissector(rlc_ps_dtch_handle, next_tvb, pinfo, tree);
|
|
|
|
break;
|
|
|
|
case MAC_CONTENT_CS_DTCH:
|
|
|
|
proto_item_append_text(ti, " (CS DTCH)");
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
proto_item_append_text(ti, " (Unknown HSDSCH Content)");
|
|
|
|
}
|
2009-10-09 06:37:48 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_register_umts_mac(void)
|
|
|
|
{
|
2012-03-06 17:11:01 +00:00
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_mac,
|
|
|
|
&ett_mac_fach,
|
|
|
|
&ett_mac_rach,
|
|
|
|
&ett_mac_dch,
|
|
|
|
&ett_mac_pch,
|
|
|
|
&ett_mac_edch,
|
|
|
|
&ett_mac_hsdsch,
|
|
|
|
};
|
|
|
|
/** XX: Looks like some duplicate filter names ?? **/
|
|
|
|
/** XX: May be OK: See doc/README.developer **/
|
|
|
|
static hf_register_info hf[] = {
|
|
|
|
{ &hf_mac_rach_fdd_tctf,
|
|
|
|
{ "Target Channel Type Field", "mac.tctf",
|
|
|
|
FT_UINT8, BASE_HEX, VALS(rach_fdd_tctf_vals), 0, NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_mac_fach_fdd_tctf,
|
|
|
|
{ "Target Channel Type Field", "mac.tctf",
|
|
|
|
FT_UINT8, BASE_HEX, VALS(fach_fdd_tctf_vals), 0, NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_mac_ct,
|
|
|
|
{ "C/T", "mac.ct",
|
|
|
|
FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_mac_ueid_type,
|
|
|
|
{ "UEID Type", "mac.ueid_type",
|
|
|
|
FT_UINT8, BASE_DEC, VALS(ueid_type_vals), 0, NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_mac_crnti,
|
|
|
|
{ "C-RNTI (UEID)", "mac.ueid",
|
|
|
|
FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_mac_urnti,
|
|
|
|
{ "U-RNTI (UEID)", "mac.ueid",
|
|
|
|
FT_UINT32, BASE_HEX, NULL, 0x0, NULL, HFILL }
|
|
|
|
},
|
|
|
|
{ &hf_mac_channel,
|
|
|
|
{ "Logical Channel", "mac.logical_channel",
|
|
|
|
FT_UINT16, BASE_DEC, VALS(mac_logical_channel_vals), 0, NULL, HFILL }
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
proto_umts_mac = proto_register_protocol("MAC", "MAC", "mac");
|
|
|
|
proto_register_field_array(proto_umts_mac, hf, array_length(hf));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
|
|
|
|
register_dissector("mac.fdd.rach", dissect_mac_fdd_rach, proto_umts_mac);
|
|
|
|
register_dissector("mac.fdd.fach", dissect_mac_fdd_fach, proto_umts_mac);
|
|
|
|
register_dissector("mac.fdd.pch", dissect_mac_fdd_pch, proto_umts_mac);
|
|
|
|
register_dissector("mac.fdd.dch", dissect_mac_fdd_dch, proto_umts_mac);
|
|
|
|
register_dissector("mac.fdd.edch", dissect_mac_fdd_edch, proto_umts_mac);
|
|
|
|
register_dissector("mac.fdd.hsdsch", dissect_mac_fdd_hsdsch, proto_umts_mac);
|
2009-10-09 06:37:48 +00:00
|
|
|
}
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|
|
|
|
|
|
|
void
|
|
|
|
proto_reg_handoff_umts_mac(void)
|
|
|
|
{
|
2012-03-06 17:11:01 +00:00
|
|
|
rlc_pcch_handle = find_dissector("rlc.pcch");
|
|
|
|
rlc_ccch_handle = find_dissector("rlc.ccch");
|
|
|
|
rlc_ctch_handle = find_dissector("rlc.ctch");
|
|
|
|
rlc_dcch_handle = find_dissector("rlc.dcch");
|
|
|
|
rlc_ps_dtch_handle = find_dissector("rlc.ps_dtch");
|
2009-10-09 06:37:48 +00:00
|
|
|
}
|
|
|
|
|