152 lines
4.3 KiB
C
152 lines
4.3 KiB
C
/* gprs_rlcmac.h
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*
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* Copyright (C) 2012 Ivan Klyuchnikov
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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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#ifndef GPRS_RLCMAC_H
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#define GPRS_RLCMAC_H
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#include <bitvector.h>
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#include <gsm_rlcmac.h>
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#include <gsm_timer.h>
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extern "C" {
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/timer.h>
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}
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#define LLC_MAX_LEN 1543
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#define UL_RLC_DATA_BLOCK_LEN 23
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enum gprs_rlcmac_tbf_stage {
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TBF_ESTABLISH,
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TBF_DATA_TRANSFER,
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TBF_RELEASE
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};
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enum gprs_rlcmac_tbf_state {
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WAIT_ESTABLISH,
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CCCH_ESTABLISH,
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PACCH_ESTABLISH,
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FINISH_ESTABLISH,
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WAIT_DATA_TRANSFER,
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DATA_TRANSFER,
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FINISH_DATA_TRANSFER,
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RELEASE
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};
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enum gprs_rlcmac_tbf_direction {
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GPRS_RLCMAC_DL_TBF,
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GPRS_RLCMAC_UL_TBF
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};
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struct tbf_llc_pdu {
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struct llist_head list;
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uint8_t num;
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uint8_t data[LLC_MAX_LEN];
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uint16_t len;
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};
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struct gprs_rlcmac_tbf {
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struct llist_head list;
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enum gprs_rlcmac_tbf_state state;
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enum gprs_rlcmac_tbf_stage stage;
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enum gprs_rlcmac_tbf_direction direction;
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struct gprs_rlcmac_tbf *next_tbf;
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uint8_t tfi;
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uint32_t tlli;
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struct llist_head llc_pdus;
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struct tbf_llc_pdu llc_pdu;
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uint8_t llc_pdu_list_len;
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uint8_t rlc_data[LLC_MAX_LEN];
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uint16_t data_index;
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uint8_t bsn;
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struct osmo_timer_list timer;
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unsigned int T; /* Txxxx number */
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unsigned int num_T_exp; /* number of consecutive T expirations */
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struct osmo_gsm_timer_list gsm_timer;
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unsigned int fT; /* fTxxxx number */
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unsigned int num_fT_exp; /* number of consecutive fT expirations */
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};
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/* TS 44.060 Section 10.4.7 Table 10.4.7.1: Payload Type field */
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enum gprs_rlcmac_block_type {
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GPRS_RLCMAC_DATA_BLOCK = 0x0,
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GPRS_RLCMAC_CONTROL_BLOCK = 0x1,
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GPRS_RLCMAC_CONTROL_BLOCK_OPT = 0x2,
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GPRS_RLCMAC_RESERVED = 0x3
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};
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extern struct llist_head gprs_rlcmac_tbfs;
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int tfi_alloc();
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static struct gprs_rlcmac_tbf *tbf_by_tfi(uint8_t tfi, gprs_rlcmac_tbf_direction dir);
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static struct gprs_rlcmac_tbf *tbf_by_tlli(uint32_t tlli, gprs_rlcmac_tbf_direction dir);
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static void tbf_free(struct gprs_rlcmac_tbf *tbf);
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static struct tbf_llc_pdu *tbf_llc_pdu_by_num(struct llist_head llc_pdus, uint8_t num);
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int tbf_add_llc_pdu(struct gprs_rlcmac_tbf *tbf, uint8_t *data, uint16_t llc_pdu_len);
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struct gprs_rlcmac_tbf *tbf_alloc(gprs_rlcmac_tbf_direction dir, uint32_t tlli = 0);
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int tbf_ul_establish(struct gprs_rlcmac_tbf *tbf, uint8_t ra, uint32_t Fn, uint16_t ta);
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int tbf_dl_establish(struct gprs_rlcmac_tbf *tbf, uint8_t *imsi = NULL);
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int tbf_ul_data_transfer(struct gprs_rlcmac_tbf *tbf, RlcMacUplinkDataBlock_t * ul_data_block);
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int tbf_dl_data_transfer(struct gprs_rlcmac_tbf *tbf, uint8_t *llc_pdu = NULL, uint16_t llc_pdu_len = 0);
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int tbf_ul_release(struct gprs_rlcmac_tbf *tbf);
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int tbf_dl_release(struct gprs_rlcmac_tbf *tbf);
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static void tbf_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int T, unsigned int seconds);
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static void tbf_gsm_timer_start(struct gprs_rlcmac_tbf *tbf, unsigned int fT, int frames);
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int write_immediate_assignment(bitvec * dest, uint8_t downlink, uint8_t ra, uint32_t fn, uint8_t ta, uint8_t tfi, uint32_t tlli = 0);
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void gprs_rlcmac_tx_ul_ack(uint8_t tfi, uint32_t tlli, RlcMacUplinkDataBlock_t * ul_data_block);
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void gprs_rlcmac_data_block_parse(gprs_rlcmac_tbf* tbf, RlcMacUplinkDataBlock_t * ul_data_block);
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int gprs_rlcmac_rcv_data_block(bitvec *rlc_block);
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int gprs_rlcmac_rcv_control_block(bitvec *rlc_block);
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void gprs_rlcmac_rcv_block(bitvec *rlc_block);
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int gprs_rlcmac_rcv_rach(uint8_t ra, uint32_t Fn, uint16_t ta);
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int gprs_rlcmac_tx_llc_pdus(struct gprs_rlcmac_tbf *tbf);
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void gprs_rlcmac_tx_ul_ud(gprs_rlcmac_tbf *tbf);
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void gprs_rlcmac_downlink_assignment(gprs_rlcmac_tbf *tbf);
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void gprs_rlcmac_packet_downlink_assignment(gprs_rlcmac_tbf *tbf);
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#endif // GPRS_RLCMAC_H
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