| /* 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_mm_state_gb_fsm.h> |
| #include <osmocom/sgsn/gprs_sgsn.h> |
| #include <osmocom/sgsn/gprs_gmm.h> |
| #include <osmocom/sgsn/debug.h> |
| |
| /* 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; |
| osmo_fsm_inst_dispatch(mmctx->gb.mm_state_fsm, E_MM_PDU_RECEPTION, NULL); |
| } |
| |
| /* MMCTX can be NULL */ |
| |
| 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; |
| } |