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-rw-r--r--src/gprs/gprs_gb.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/src/gprs/gprs_gb.c b/src/gprs/gprs_gb.c
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+++ b/src/gprs/gprs_gb.c
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+/* 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;
+}