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/* GPRS RLC/MAC protocol implementation as per 3GPP TS 44.060 */
/* (C) 2023 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
* All Rights Reserved
* Author: Pau Espin Pedrol <pespin@sysmocom.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/lienses/>.
*
*/
#include <errno.h>
#include <stdint.h>
#include <stdbool.h>
#include <inttypes.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/timer.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/rate_ctr.h>
#include <osmocom/crypt/kdf.h>
#include <osmocom/gprs/gprs_bssgp.h>
#include <osmocom/gsm/gsm_utils.h>
#include <osmocom/gprs/rlcmac/rlcmac_prim.h>
#include <osmocom/gprs/rlcmac/rlcmac.h>
#include <osmocom/gprs/llc/llc_prim.h>
#include <osmocom/bb/common/logging.h>
#include <osmocom/bb/common/apn.h>
#include <osmocom/bb/common/ms.h>
#include <osmocom/bb/modem/rlcmac.h>
static int modem_rlcmac_handle_grr(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
int rc;
osmo_static_assert(sizeof(struct osmo_gprs_rlcmac_grr_prim) == sizeof(struct osmo_gprs_llc_grr_prim),
_grr_prim_size);
switch (rlcmac_prim->oph.primitive) {
case OSMO_GPRS_RLCMAC_GRR_UNITDATA:
/* Forward it to upper layers, pass ownership over to LLC: */
/* Optimization: RLCMAC-GRR-UNITDATA-IND is 1-to-1 ABI compatible with
LLC-GRR-UNITDATA-IND, we just need to adapt the header.
See osmo_static_assert(_grr_prim_size) above.
*/
rlcmac_prim->oph.sap = OSMO_GPRS_LLC_SAP_GRR;
rlcmac_prim->oph.primitive = OSMO_GPRS_LLC_GRR_UNITDATA;
osmo_gprs_llc_prim_lower_up((struct osmo_gprs_llc_prim *)rlcmac_prim);
rc = 1; /* Tell RLCMAC that we take ownership of the prim. */
break;
case OSMO_GPRS_RLCMAC_GRR_DATA:
default:
LOGP(DRLCMAC, LOGL_NOTICE, "%s(): Unexpected Rx RLCMAC GRR prim %u\n",
__func__, rlcmac_prim->oph.primitive);
rc = -EINVAL;
break;
}
return rc;
}
static int modem_rlcmac_handle_gmmrr(struct osmo_gprs_rlcmac_prim *rlcmac_prim)
{
int rc;
switch (rlcmac_prim->oph.primitive) {
case OSMO_GPRS_RLCMAC_GMMRR_PAGE:
LOGP(DRLCMAC, LOGL_ERROR, "%s(): TODO: implement answering to paging indication TLLI=0x%08x\n",
__func__, rlcmac_prim->gmmrr.page_ind.tlli);
rc = 0;
break;
default:
LOGP(DRLCMAC, LOGL_NOTICE, "%s(): Unexpected Rx RLCMAC GMMRR prim %u\n",
__func__, rlcmac_prim->oph.primitive);
rc = -EINVAL;
}
return rc;
}
static int modem_rlcmac_prim_up_cb(struct osmo_gprs_rlcmac_prim *rlcmac_prim, void *user_data)
{
const char *pdu_name = osmo_gprs_rlcmac_prim_name(rlcmac_prim);
int rc = 0;
switch (rlcmac_prim->oph.sap) {
case OSMO_GPRS_RLCMAC_SAP_GRR:
LOGP(DRLCMAC, LOGL_DEBUG, "%s(): Rx %s TLLI=0x%08x ll=[%s]\n",
__func__, pdu_name, rlcmac_prim->grr.tlli,
osmo_hexdump(rlcmac_prim->grr.ll_pdu, rlcmac_prim->grr.ll_pdu_len));
rc = modem_rlcmac_handle_grr(rlcmac_prim);
break;
case OSMO_GPRS_RLCMAC_SAP_GMMRR:
LOGP(DRLCMAC, LOGL_DEBUG, "%s(): Rx %s\n",
__func__, pdu_name);
rc = modem_rlcmac_handle_gmmrr(rlcmac_prim);
break;
default:
LOGP(DRLCMAC, LOGL_NOTICE, "%s(): Unexpected Rx %s\n", __func__, pdu_name);
OSMO_ASSERT(0);
}
return rc;
}
static int modem_rlcmac_prim_down_cb(struct osmo_gprs_rlcmac_prim *rlcmac_prim, void *user_data)
{
const char *pdu_name = osmo_gprs_rlcmac_prim_name(rlcmac_prim);
int rc = 0;
switch (rlcmac_prim->oph.sap) {
default:
LOGP(DRLCMAC, LOGL_DEBUG, "%s(): Unexpected Rx %s\n", __func__, pdu_name);
OSMO_ASSERT(0);
}
return rc;
}
int modem_rlcmac_init(struct osmocom_ms *ms)
{
int rc;
rc = osmo_gprs_rlcmac_init(OSMO_GPRS_RLCMAC_LOCATION_MS);
if (rc != 0)
return rc;
osmo_gprs_rlcmac_set_log_cat(OSMO_GPRS_RLCMAC_LOGC_RLCMAC, DRLCMAC);
osmo_gprs_rlcmac_prim_set_up_cb(modem_rlcmac_prim_up_cb, ms);
osmo_gprs_rlcmac_prim_set_down_cb(modem_rlcmac_prim_down_cb, ms);
return rc;
}
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