85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/* TBF as per 3GPP TS 44.064 */
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/*
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* (C) 2023 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (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 Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <osmocom/core/bitvec.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/gsm/protocol/gsm_04_08.h>
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#include <osmocom/gprs/rlcmac/tbf.h>
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#include <osmocom/gprs/rlcmac/tbf_ul.h>
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#include <osmocom/gprs/rlcmac/gre.h>
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#include <osmocom/gprs/rlcmac/rlcmac_enc.h>
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void gprs_rlcmac_tbf_constructor(struct gprs_rlcmac_tbf *tbf,
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enum gprs_rlcmac_tbf_direction direction,
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struct gprs_rlcmac_entity *gre)
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{
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tbf->gre = gre;
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tbf->direction = direction;
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}
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void gprs_rlcmac_tbf_destructor(struct gprs_rlcmac_tbf *tbf)
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{
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}
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void gprs_rlcmac_tbf_free(struct gprs_rlcmac_tbf *tbf)
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{
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if (tbf->direction == GPRS_RLCMAC_TBF_DIR_UL)
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gprs_rlcmac_ul_tbf_free(tbf_as_ul_tbf(tbf));
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/* else: TODO dl_tbf not yet implemented */
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}
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struct msgb *gprs_rlcmac_tbf_create_pkt_ctrl_ack(const struct gprs_rlcmac_tbf *tbf)
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{
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struct msgb *msg;
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struct bitvec bv;
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RlcMacUplink_t ul_block;
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int rc;
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OSMO_ASSERT(tbf);
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msg = msgb_alloc(GSM_MACBLOCK_LEN, "pkt_ctrl_ack");
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if (!msg)
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return NULL;
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/* Initialize a bit vector that uses allocated msgb as the data buffer. */
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bv = (struct bitvec){
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.data = msgb_put(msg, GSM_MACBLOCK_LEN),
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.data_len = GSM_MACBLOCK_LEN,
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};
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bitvec_unhex(&bv, GPRS_RLCMAC_DUMMY_VEC);
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gprs_rlcmac_enc_prepare_pkt_ctrl_ack(&ul_block, tbf->gre->tlli);
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rc = osmo_gprs_rlcmac_encode_uplink(&bv, &ul_block);
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if (rc < 0) {
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LOGPTBF(tbf, LOGL_ERROR, "Encoding of Packet Control ACK failed (%d)\n", rc);
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goto free_ret;
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}
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LOGPTBF(tbf, LOGL_DEBUG, "Tx Packet Control Ack\n");
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return msg;
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free_ret:
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msgb_free(msg);
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return NULL;
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}
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