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/* GPRS BSSGP protocol implementation as per 3GPP TS 08.18 */
/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
* (C) 2010 by On-Waves
* (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
*
* All Rights Reserved
*
* 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/licenses/>.
*
*/
#include <osmocom/core/prim.h>
#include <osmocom/core/rate_ctr.h>
#include <osmocom/gprs/gprs_bssgp.h>
#include <osmocom/gprs/gprs_ns2.h>
#include <osmocom/sgsn/gprs_llc.h>
#include <osmocom/sgsn/gprs_gmm.h>
#include <osmocom/sgsn/sgsn_rim.h>
/* call-back function for the BSSGP protocol */
int sgsn_bssgp_rx_prim(struct osmo_prim_hdr *oph)
{
struct osmo_bssgp_prim *bp;
bp = container_of(oph, struct osmo_bssgp_prim, oph);
switch (oph->sap) {
case SAP_BSSGP_LL:
switch (oph->primitive) {
case PRIM_BSSGP_UL_UD:
return gprs_llc_rcvmsg(oph->msg, bp->tp);
}
break;
case SAP_BSSGP_GMM:
switch (oph->primitive) {
case PRIM_BSSGP_GMM_SUSPEND:
return gprs_gmm_rx_suspend(bp->ra_id, bp->tlli);
case PRIM_BSSGP_GMM_RESUME:
return gprs_gmm_rx_resume(bp->ra_id, bp->tlli,
bp->u.resume.suspend_ref);
}
break;
case SAP_BSSGP_NM:
break;
case SAP_BSSGP_RIM:
return sgsn_rim_rx_from_gb(bp, oph->msg);
}
return 0;
}
int sgsn_bssgp_page_ps_ra(struct sgsn_mm_ctx *mmctx)
{
struct bssgp_paging_info pinfo;
int rc;
/* FIXME: page whole routing area, not only the last known cell */
/* initiate PS PAGING procedure */
memset(&pinfo, 0, sizeof(pinfo));
pinfo.mode = BSSGP_PAGING_PS;
pinfo.scope = BSSGP_PAGING_BVCI;
pinfo.bvci = mmctx->gb.bvci;
pinfo.imsi = mmctx->imsi;
pinfo.ptmsi = &mmctx->p_tmsi;
pinfo.drx_params = mmctx->drx_parms;
pinfo.qos[0] = 0; // FIXME
rc = bssgp_tx_paging(mmctx->gb.nsei, 0, &pinfo);
rate_ctr_inc(rate_ctr_group_get_ctr(mmctx->ctrg, GMM_CTR_PAGING_PS));
return rc;
}
/* called by the bssgp layer to send NS PDUs */
int sgsn_bssgp_dispatch_ns_unitdata_req_cb(void *ctx, struct msgb *msg)
{
struct gprs_ns2_inst *nsi = (struct gprs_ns2_inst *) ctx;
struct osmo_gprs_ns2_prim nsp = {};
nsp.nsei = msgb_nsei(msg);
nsp.bvci = msgb_bvci(msg);
osmo_prim_init(&nsp.oph, SAP_NS, GPRS_NS2_PRIM_UNIT_DATA, PRIM_OP_REQUEST, msg);
return gprs_ns2_recv_prim(nsi, &nsp.oph);
}
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