938 lines
36 KiB
C
938 lines
36 KiB
C
/* Routines for UMTS MAC (3GPP TS 25.321) disassembly
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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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#include <epan/conversation.h>
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#include <epan/expert.h>
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#include "packet-rrc.h"
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#include "packet-umts_fp.h"
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#include "packet-umts_mac.h"
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#include "packet-rlc.h"
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#include "packet-nbap.h"
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int proto_umts_mac = -1;
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extern int proto_fp;
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extern int proto_rlc;
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extern int proto_rrc;
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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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static int hf_mac_channel_str = -1;
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static int hf_mac_lch_id = -1;
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static int hf_mac_macdflowd_id = -1;
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static int hf_mac_channel_hsdsch = -1;
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static int hf_mac_trch_id = -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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static dissector_handle_t rlc_ctch_handle;
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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 dissector_handle_t rrc_handle;
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/* MAC-is reassembly */
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typedef struct {
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guint32 frame_num;
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guint16 tsn;
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guint8 * data;
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guint32 length;
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tvbuff_t * tvb;
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} mac_is_sdu;
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typedef struct {
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guint8 * data;
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guint32 length;
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guint32 frame_num;
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} mac_is_fragment;
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static GHashTable * mac_is_sdus = NULL;
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static GHashTable * mac_is_fragments = NULL;
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static gboolean mac_is_sdu_equal(gconstpointer a, gconstpointer b)
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{
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const mac_is_sdu *x = a, *y = b;
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return x->frame_num == y->frame_num && x->tsn == y->tsn;
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}
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static guint mac_is_sdu_hash(gconstpointer key)
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{
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const mac_is_sdu *sdu = key;
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return (sdu->frame_num << 6) | sdu->tsn;
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}
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static const value_string rach_fdd_tctf_vals[] = {
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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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};
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static const value_string fach_fdd_tctf_vals[] = {
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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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};
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static const value_string ueid_type_vals[] = {
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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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};
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static const value_string mac_logical_channel_vals[] = {
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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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};
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static guint8 fach_fdd_tctf(guint8 hdr, guint16 *bit_offs)
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{
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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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}
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static guint16 tree_add_common_dcch_dtch_fields(tvbuff_t *tvb, packet_info *pinfo _U_,
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proto_tree *tree, guint16 bitoffs, fp_info *fpinf, umts_mac_info *macinf, rlc_info *rlcinf)
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{
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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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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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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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}
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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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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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}
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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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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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rlc_info *rlcinf;
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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 = (umts_mac_info *)p_get_proto_data(pinfo->fd, proto_umts_mac);
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fpinf = (fp_info *)p_get_proto_data(pinfo->fd, proto_fp);
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rlcinf = (rlc_info *)p_get_proto_data(pinfo->fd, proto_rlc);
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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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expert_add_info_format(pinfo,ti,PI_MALFORMED,PI_ERROR,"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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bitoffs = tree_add_common_dcch_dtch_fields(tvb, pinfo, rach_tree, bitoffs, fpinf, macinf, rlcinf);
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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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expert_add_info_format(pinfo, NULL, PI_MALFORMED, PI_ERROR, "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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expert_add_info_format(pinfo, NULL, PI_MALFORMED, PI_ERROR, "Unknown RACH TCTF ");
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}
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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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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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rlc_info *rlcinf;
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struct rrc_info *rrcinf;
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proto_item *ti = NULL;
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gint c_t;
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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);
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macinf = (umts_mac_info *)p_get_proto_data(pinfo->fd, proto_umts_mac);
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fpinf = (fp_info *)p_get_proto_data(pinfo->fd, proto_fp);
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rlcinf = (rlc_info *)p_get_proto_data(pinfo->fd, proto_rlc);
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if (!macinf || !fpinf) {
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proto_tree_add_text(fach_tree, tvb, 0, -1,
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"Cannot dissect MAC frame because per-frame info is missing");
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expert_add_info_format(pinfo,ti,PI_MALFORMED,PI_ERROR,"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(fach_tree, hf_mac_fach_fdd_tctf, tvb, 0, tctf_len, ENC_BIG_ENDIAN);
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if (tctf == TCTF_DCCH_DTCH_FACH_FDD) {
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macinf->ctmux[fpinf->cur_tb] = 1; /* DCCH/DTCH on FACH *always* has a C/T */
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bitoffs = tree_add_common_dcch_dtch_fields(tvb, pinfo, fach_tree, bitoffs, fpinf, macinf, rlcinf);
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}
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chan = fpinf->cur_chan;
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switch (tctf) {
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tvbuff_t *next_tvb;
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case TCTF_CCCH_FACH_FDD:
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proto_item_append_text(ti, " (CCCH)");
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channel_type = proto_tree_add_uint(fach_tree, hf_mac_channel, tvb, 0, 0, MAC_CCCH);
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PROTO_ITEM_SET_GENERATED(channel_type);
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/* CCCH over FACH is always octet aligned */
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next_tvb = tvb_new_subset(tvb, 1, tvb_length_remaining(tvb, 1), -1);
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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_FACH_FDD:
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/*Set RLC Mode based on the L-CHID derived from the C/T flag*/
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c_t = tvb_get_bits8(tvb,bitoffs-4,4);
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rlcinf->mode[fpinf->cur_tb] = lchId_rlc_map[c_t+1];
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switch (macinf->content[fpinf->cur_tb]) {
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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(fach_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(fach_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 DCCH 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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expert_add_info_format(pinfo, NULL, PI_DEBUG, PI_ERROR, "CS DTCH Is not implemented");
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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 FACH Content");
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expert_add_info_format(pinfo, NULL, PI_MALFORMED, PI_ERROR, "Unknown FACH Content for this transportblock");
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}
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break;
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case TCTF_CTCH_FACH_FDD:
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proto_item_append_text(ti, " (CTCH)");
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channel_type = proto_tree_add_uint(fach_tree, hf_mac_channel, tvb, 0, 0, MAC_CTCH);
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PROTO_ITEM_SET_GENERATED(channel_type);
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/* 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;
|
|
/* july 5: Added support for BCCH*/
|
|
case TCTF_BCCH_FACH_FDD:
|
|
proto_item_append_text(ti, " (BCCH)");
|
|
channel_type = proto_tree_add_uint(fach_tree, hf_mac_channel, tvb, 0, 0, MAC_BCCH);
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
/*We need to skip the first two bits (the TCTF bits), and since there is no MAC header, send rest to RRC*/
|
|
next_tvb= tvb_new_octet_aligned(tvb, 2, (tvb_length(tvb)*8)-2);
|
|
add_new_data_source(pinfo, next_tvb, "Octet-Aligned BCCH Data");
|
|
|
|
/* In this case skip RLC and call RRC immediately subdissector */
|
|
rrcinf = p_get_proto_data(pinfo->fd, proto_rrc);
|
|
if (!rrcinf) {
|
|
rrcinf = se_alloc0(sizeof(struct rrc_info));
|
|
p_add_proto_data(pinfo->fd, proto_rrc, rrcinf);
|
|
}
|
|
rrcinf->msgtype[fpinf->cur_tb] = RRC_MESSAGE_TYPE_BCCH_FACH;
|
|
call_dissector(rrc_handle, next_tvb, pinfo, tree);
|
|
|
|
break;
|
|
case TCTF_MSCH_FACH_FDD:
|
|
case TCTF_MCCH_FACH_FDD:
|
|
case TCTF_MTCH_FACH_FDD:
|
|
expert_add_info_format(pinfo, NULL, PI_DEBUG, PI_ERROR, " Unimplemented FACH Content type!");
|
|
break;
|
|
default:
|
|
proto_item_append_text(ti, " (Unknown FACH Content)");
|
|
expert_add_info_format(pinfo, NULL, PI_MALFORMED, PI_ERROR, " Unknown FACH Content");
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void dissect_mac_fdd_dch(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
guint16 pos;
|
|
guint8 bitoffs = 0;
|
|
umts_mac_info *macinf;
|
|
fp_info *fpinf;
|
|
rlc_info *rlcinf;
|
|
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 = (umts_mac_info *)p_get_proto_data(pinfo->fd, proto_umts_mac);
|
|
fpinf = (fp_info *)p_get_proto_data(pinfo->fd, proto_fp);
|
|
rlcinf = (rlc_info *)p_get_proto_data(pinfo->fd, proto_rlc);
|
|
if (!macinf || !fpinf) {
|
|
if(!macinf){
|
|
g_warning("MACinf == NULL");
|
|
}
|
|
if(!fpinf){
|
|
g_warning("fpinf == NULL");
|
|
}
|
|
ti = proto_tree_add_text(dch_tree, tvb, 0, -1,
|
|
"Cannot dissect MAC frame because per-frame info is missing");
|
|
expert_add_info_format(pinfo,ti,PI_DEBUG,PI_ERROR,"MAC frame missing frame information!");
|
|
return;
|
|
}
|
|
pos = fpinf->cur_tb;
|
|
|
|
if (macinf->ctmux[pos]) {
|
|
if(rlcinf){
|
|
rlcinf->rbid[fpinf->cur_tb] = tvb_get_bits8(tvb, bitoffs, 4);
|
|
}
|
|
/*Add CT flag to GUI*/
|
|
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)");
|
|
|
|
/*Show logical channel id*/
|
|
if(macinf->lchid[pos]!= 255){
|
|
channel_type = proto_tree_add_uint(dch_tree, hf_mac_lch_id, tvb, 0, 0, macinf->lchid[pos]);
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
if(macinf->fake_chid[pos]){
|
|
channel_type = proto_tree_add_text(dch_tree, tvb,0, 0, "This is a faked logical channel id!");
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
}
|
|
}else{
|
|
channel_type = proto_tree_add_text(dch_tree, tvb,0, 0, "Frame is missing logical channel");
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
}
|
|
|
|
channel_type = proto_tree_add_uint(dch_tree, hf_mac_channel, tvb, 0, 0, MAC_DCCH);
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
/*Transport channel printout*/
|
|
channel_type = proto_tree_add_uint(dch_tree, hf_mac_trch_id, tvb, 0, 0, macinf->trchid[pos]);
|
|
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)");
|
|
/*Show logical channel id*/
|
|
if(macinf->lchid[pos]!= 255){
|
|
channel_type = proto_tree_add_uint(dch_tree, hf_mac_lch_id, tvb, 0, 0, macinf->lchid[pos]);
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
}else{
|
|
channel_type = proto_tree_add_text(dch_tree, tvb,0, 0, "Frame is missing logical channel");
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
}
|
|
|
|
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)");
|
|
/*Show logical channel id*/
|
|
if(macinf->lchid[pos]!= 255){
|
|
channel_type = proto_tree_add_uint(dch_tree, hf_mac_lch_id, tvb, 0, 0, macinf->lchid[pos]);
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
if(macinf->fake_chid[pos]){
|
|
channel_type = proto_tree_add_text(dch_tree, tvb,0, 0, "This is a faked logical channel id!");
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
}
|
|
}else{
|
|
channel_type = proto_tree_add_text(dch_tree, tvb,0, 0, "Frame is missing logical channel");
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
}
|
|
|
|
channel_type = proto_tree_add_uint(dch_tree, hf_mac_channel, tvb, 0, 0, MAC_DTCH);
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
|
|
|
|
/*Transport channel printout*/
|
|
channel_type = proto_tree_add_uint(dch_tree, hf_mac_trch_id, tvb, 0, 0, macinf->trchid[pos]);
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
break;
|
|
default:
|
|
proto_item_append_text(ti, " (Unknown DCH Content)");
|
|
expert_add_info_format(pinfo, NULL, PI_MALFORMED, PI_ERROR, "Unknown DCH Content");
|
|
;
|
|
}
|
|
}
|
|
|
|
static void init_frag(tvbuff_t * tvb, mac_is_fragment ** mifref, guint length, guint32 frame_num, guint offset)
|
|
{
|
|
*mifref = g_new(mac_is_fragment, 1);
|
|
(*mifref)->length = length;
|
|
(*mifref)->data = g_malloc(length);
|
|
(*mifref)->frame_num = frame_num;
|
|
tvb_memcpy(tvb, (*mifref)->data, offset, length);
|
|
}
|
|
|
|
static tvbuff_t * reassemble(tvbuff_t * tvb, mac_is_fragment ** mifref, guint frame_num, guint16 tsn, guint maclength, guint offset, gboolean reverse)
|
|
{
|
|
mac_is_sdu * sdu;
|
|
mac_is_fragment * mif = *mifref;
|
|
|
|
sdu = se_new(mac_is_sdu);
|
|
if (reverse) {
|
|
sdu->frame_num = mif->frame_num;
|
|
sdu->tsn = tsn-1;
|
|
} else {
|
|
sdu->frame_num = frame_num;
|
|
sdu->tsn = tsn;
|
|
}
|
|
sdu->length = mif->length + maclength;
|
|
sdu->data = se_alloc(sdu->length);
|
|
|
|
if (reverse == FALSE) {
|
|
memcpy(sdu->data, mif->data, mif->length);
|
|
tvb_memcpy(tvb, sdu->data+mif->length, offset, maclength);
|
|
} else {
|
|
tvb_memcpy(tvb, sdu->data, offset, maclength);
|
|
memcpy(sdu->data+maclength, mif->data, mif->length);
|
|
}
|
|
g_free(mif->data);
|
|
g_free(mif);
|
|
sdu->tvb = tvb_new_child_real_data(tvb, sdu->data, sdu->length, sdu->length);
|
|
g_hash_table_insert(mac_is_sdus, sdu, NULL);
|
|
*mifref = NULL; /* Reset the pointer. */
|
|
return sdu->tvb;
|
|
}
|
|
|
|
static tvbuff_t * get_sdu(tvbuff_t * tvb, packet_info * pinfo, guint16 tsn)
|
|
{
|
|
gpointer orig_key = NULL;
|
|
mac_is_sdu sdu_lookup_key;
|
|
sdu_lookup_key.frame_num = pinfo->fd->num;
|
|
sdu_lookup_key.tsn = tsn;
|
|
|
|
if (g_hash_table_lookup_extended(mac_is_sdus, &sdu_lookup_key, &orig_key, NULL)) {
|
|
mac_is_sdu * sdu = orig_key;
|
|
sdu->tvb = tvb_new_child_real_data(tvb, sdu->data, sdu->length, sdu->length);
|
|
add_new_data_source(pinfo, sdu->tvb, "Reassembled MAC-is SDU");
|
|
return sdu->tvb;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
tvbuff_t * mac_is_add_fragment(tvbuff_t * tvb, packet_info *pinfo, guint8 lchid, int offset, guint8 ss, guint16 tsn, int sdu_no, guint8 no_sdus, guint16 maclength)
|
|
{
|
|
/* Get fragment table for this logical channel. */
|
|
mac_is_fragment ** fragments = g_hash_table_lookup(mac_is_fragments, GINT_TO_POINTER((gint)lchid));
|
|
/* If this is the first time we see this channel. */
|
|
if (fragments == NULL) {
|
|
/* Create new table */
|
|
fragments = se_alloc_array(mac_is_fragment*, 64);
|
|
memset(fragments, 0, sizeof(mac_is_fragment*)*64);
|
|
g_hash_table_insert(mac_is_fragments, GINT_TO_POINTER((gint)lchid), fragments);
|
|
}
|
|
|
|
/* If in first scan-through. */
|
|
if (pinfo->fd->flags.visited == FALSE) {
|
|
/* If first SDU is last segment of previous. A tail. */
|
|
if (sdu_no == 0 && (ss & 1) == 1) {
|
|
/* If no one has inserted the head for our tail yet. */
|
|
if (fragments[tsn] == NULL) {
|
|
init_frag(tvb, &fragments[tsn], maclength, pinfo->fd->num, offset);
|
|
/* If there is a head, attach a tail to it and return. */
|
|
} else {
|
|
return reassemble(tvb, &(fragments[tsn]), pinfo->fd->num, tsn, maclength, offset, FALSE);
|
|
}
|
|
}
|
|
/* If last SDU is first segment of next. A head. */
|
|
else if (sdu_no == no_sdus-1 && (ss & 2) == 2) {
|
|
/* If there is no tail yet, store away a head for a future tail. */
|
|
if (fragments[(tsn+1) % 64] == NULL) {
|
|
init_frag(tvb, &(fragments[(tsn+1)%64]), maclength, pinfo->fd->num, offset);
|
|
/* If there already is a tail for our head here, attach it. */
|
|
} else {
|
|
return reassemble(tvb, &fragments[(tsn+1)%64], pinfo->fd->num, tsn, maclength, offset, TRUE);
|
|
}
|
|
/* If our SDU is not fragmented. */
|
|
} else {
|
|
DISSECTOR_ASSERT((sdu_no == 0) ? (ss&1) == 0 : ((sdu_no == no_sdus-1) ? (ss&2) == 0 : TRUE));
|
|
return tvb_new_subset(tvb, offset, maclength, -1);
|
|
}
|
|
/* If clicking on a packet. */
|
|
} else {
|
|
/* If first SDU is last segment of previous. A tail. */
|
|
if (sdu_no == 0 && (ss & 1) == 1) {
|
|
return get_sdu(tvb, pinfo, tsn);
|
|
/* If last SDU is first segment of next. A head. */
|
|
} else if (sdu_no == no_sdus-1 && (ss & 2) == 2) {
|
|
return NULL; /* Do not give heads any data. */
|
|
} else {
|
|
return tvb_new_subset(tvb, offset, maclength, -1);
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void dissect_mac_fdd_edch(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
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 = (fp_info *)p_get_proto_data(pinfo->fd, proto_fp);
|
|
|
|
macinf = (umts_mac_info *)p_get_proto_data(pinfo->fd, proto_umts_mac);
|
|
if (!macinf|| !fpinf) {
|
|
ti = proto_tree_add_text(edch_tree, tvb, 0, -1,
|
|
"Cannot dissect MAC frame because per-frame info is missing");
|
|
expert_add_info_format(pinfo,ti,PI_DEBUG,PI_ERROR,"MAC frame missing frame information!");
|
|
return;
|
|
}
|
|
|
|
pos = fpinf->cur_tb;
|
|
|
|
switch (macinf->content[pos]) {
|
|
case MAC_CONTENT_DCCH:
|
|
proto_item_append_text(ti, " (DCCH)");
|
|
|
|
/*Show the logical channel id*/
|
|
channel_type = proto_tree_add_uint(edch_tree, hf_mac_lch_id, tvb, 0, 0, macinf->lchid[pos]);
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
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)");
|
|
|
|
/*Show the logical channel id*/
|
|
channel_type = proto_tree_add_uint(edch_tree, hf_mac_lch_id, tvb, 0, 0, macinf->lchid[pos]);
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
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)");
|
|
expert_add_info_format(pinfo, ti, PI_MALFORMED, PI_ERROR, "Unknown EDCH Content");
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* to avoid unnecessary re-alignment, the 4 bit padding prepended to the HSDSCH in FP type 1
|
|
* 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)
|
|
{
|
|
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 = (fp_info *)p_get_proto_data(pinfo->fd, proto_fp);
|
|
macinf = (umts_mac_info *)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");
|
|
expert_add_info_format(pinfo,ti,PI_MALFORMED,PI_ERROR,"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, macinf->pdu_len); /*Get rid of possible padding in at the end?*/
|
|
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_hsdsch, tvb, 0, 0, MAC_DCCH);
|
|
PROTO_ITEM_SET_GENERATED(channel_type)*/
|
|
/*Set the logical channel id if it exists */
|
|
if(macinf->lchid[pos] != 255){
|
|
channel_type = proto_tree_add_uint(hsdsch_tree, hf_mac_lch_id, tvb, 0, 0, macinf->lchid[pos]);
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
if(macinf->fake_chid[pos]){
|
|
channel_type = proto_tree_add_text(hsdsch_tree, tvb,0, 0, "This is a faked logical channel id!");
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
}
|
|
}else{
|
|
channel_type = proto_tree_add_text(hsdsch_tree, tvb,0, 0, "Frame is missing logical channel");
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
}
|
|
|
|
/*Set the type of channel*/
|
|
/*channel_type = proto_tree_add_text(hsdsch_tree, tvb,0, 0, "Logcial Channel Type: PS DTCH");
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
*/
|
|
channel_type = proto_tree_add_uint(hsdsch_tree, hf_mac_channel, tvb, 0, 0, MAC_DCCH);
|
|
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
/*Set the MACd-Flow ID*/
|
|
channel_type = proto_tree_add_uint(hsdsch_tree, hf_mac_macdflowd_id, tvb, 0, 0, macinf->macdflow_id[pos]);
|
|
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)");
|
|
|
|
/*Set the logical channel id if it exists */
|
|
if(macinf->lchid[pos] != 255){
|
|
channel_type = proto_tree_add_uint(hsdsch_tree, hf_mac_lch_id, tvb, 0, 0, macinf->lchid[pos]);
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
if(macinf->fake_chid[pos]){
|
|
channel_type = proto_tree_add_text(hsdsch_tree, tvb,0, 0, "This is a faked logical channel id!");
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
}
|
|
}else{
|
|
channel_type = proto_tree_add_text(hsdsch_tree, tvb,0, 0, "Frame is missing logical channel");
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
}
|
|
|
|
/*Sets the channel type*/
|
|
channel_type = proto_tree_add_uint(hsdsch_tree, hf_mac_channel, tvb, 0, 0, MAC_DTCH);
|
|
|
|
PROTO_ITEM_SET_GENERATED(channel_type);
|
|
|
|
/*Set the MACd-Flow ID*/
|
|
channel_type = proto_tree_add_uint(hsdsch_tree, hf_mac_macdflowd_id, tvb, 0, 0, macinf->macdflow_id[pos]);
|
|
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)");
|
|
expert_add_info_format(pinfo, NULL, PI_MALFORMED, PI_ERROR, "Unknown HSDSCH Content");
|
|
}
|
|
}
|
|
|
|
static void mac_init(void)
|
|
{
|
|
if (mac_is_sdus != NULL) {
|
|
g_hash_table_destroy(mac_is_sdus);
|
|
}
|
|
if (mac_is_fragments != NULL) {
|
|
g_hash_table_destroy(mac_is_fragments);
|
|
}
|
|
mac_is_sdus = g_hash_table_new(mac_is_sdu_hash, mac_is_sdu_equal);
|
|
mac_is_fragments = g_hash_table_new(g_direct_hash, g_direct_equal);
|
|
}
|
|
|
|
void
|
|
proto_register_umts_mac(void)
|
|
{
|
|
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 Type", "mac.logical_channel",
|
|
FT_UINT16, BASE_DEC, VALS(mac_logical_channel_vals), 0, NULL, HFILL }
|
|
},
|
|
|
|
{ &hf_mac_channel_str,
|
|
{ "Logical Channel", "mac.logical_channel",
|
|
FT_STRING, BASE_NONE, NULL, 0, NULL, HFILL }
|
|
},
|
|
{ &hf_mac_channel_hsdsch,
|
|
{ "MACd-FlowID", "mac.macd_flowid", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_mac_macdflowd_id,
|
|
{ "MACd-FlowID", "mac.macd_flowid", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_mac_lch_id,
|
|
{ "Logical Channel ID", "mac.logical_channel_id", FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }
|
|
},
|
|
{ &hf_mac_trch_id,
|
|
{ "Transport Channel ID", "mac.transport_channel_id", FT_UINT16, BASE_DEC, NULL, 0x0, 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);
|
|
|
|
register_init_routine(mac_init);
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_umts_mac(void)
|
|
{
|
|
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");
|
|
|
|
rrc_handle = find_dissector("rrc");
|
|
}
|