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Diffstat (limited to 'src/gprs/gprs_gb.c')
| -rw-r--r-- | src/gprs/gprs_gb.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/src/gprs/gprs_gb.c b/src/gprs/gprs_gb.c new file mode 100644 index 000000000..29bfc53ee --- /dev/null +++ b/src/gprs/gprs_gb.c @@ -0,0 +1,91 @@ +/* Messages on the Gb interface (A/Gb mode) */ + +/* (C) 2009-2015 by Harald Welte <laforge@gnumonks.org> + * (C) 2010 by On-Waves + * (C) 2019 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/rate_ctr.h> + +#include <osmocom/gprs/gprs_msgb.h> +#include <osmocom/gprs/gprs_bssgp.h> + +#include "bscconfig.h" + +#include <osmocom/sgsn/gprs_sgsn.h> +#include <osmocom/sgsn/gprs_gmm.h> +#include <osmocom/sgsn/debug.h> + +/* Update the MM context state */ +static void gsm0408_gprs_notify_pdu_gb(struct sgsn_mm_ctx *mmctx) +{ + switch (mmctx->pmm_state) { + case MM_STANDBY: + mmctx_set_mm_state(mmctx, MM_READY); + break; + case MM_READY: /* RE-arm the timer upon receival of Gb PDUs */ + mmctx_state_timer_start(mmctx, 3314); + break; + default: + break; + } +} + +/* Main entry point for incoming 04.08 GPRS messages from Gb */ +int gsm0408_gprs_rcvmsg_gb(struct msgb *msg, struct gprs_llc_llme *llme, + bool drop_cipherable) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + uint8_t pdisc = gsm48_hdr_pdisc(gh); + struct sgsn_mm_ctx *mmctx; + struct gprs_ra_id ra_id; + int rc = -EINVAL; + + bssgp_parse_cell_id(&ra_id, msgb_bcid(msg)); + mmctx = sgsn_mm_ctx_by_tlli(msgb_tlli(msg), &ra_id); + if (mmctx) { + msgid2mmctx(mmctx, msg); + rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PKTS_SIG_IN]); + mmctx->gb.llme = llme; + } + + /* MMCTX can be NULL */ + + if (mmctx) + gsm0408_gprs_notify_pdu_gb(mmctx); + + switch (pdisc) { + case GSM48_PDISC_MM_GPRS: + rc = gsm0408_rcv_gmm(mmctx, msg, llme, drop_cipherable); + break; + case GSM48_PDISC_SM_GPRS: + rc = gsm0408_rcv_gsm(mmctx, msg, llme); + break; + default: + LOGMMCTXP(LOGL_NOTICE, mmctx, + "Unknown GSM 04.08 discriminator 0x%02x: %s\n", + pdisc, osmo_hexdump((uint8_t *)gh, msgb_l3len(msg))); + /* FIXME: return status message */ + break; + } + + /* MMCTX can be invalid */ + + return rc; +} |