| Pau Espin Pedrol | 7a74ae4 | 2022-12-23 16:33:17 +0100 | [diff] [blame] | 1 | /* GPRS BSSGP protocol implementation as per 3GPP TS 08.18 */ |
| 2 | |
| 3 | /* (C) 2010 by Harald Welte <laforge@gnumonks.org> |
| 4 | * (C) 2010 by On-Waves |
| 5 | * (C) 2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> |
| 6 | * |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU Affero General Public License as published by |
| 11 | * the Free Software Foundation; either version 3 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU Affero General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Affero General Public License |
| 20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 21 | * |
| 22 | */ |
| 23 | #include <osmocom/core/prim.h> |
| 24 | #include <osmocom/core/rate_ctr.h> |
| 25 | |
| 26 | #include <osmocom/gprs/gprs_bssgp.h> |
| 27 | #include <osmocom/gprs/gprs_ns2.h> |
| 28 | |
| 29 | #include <osmocom/sgsn/gprs_llc.h> |
| 30 | #include <osmocom/sgsn/gprs_gmm.h> |
| 31 | #include <osmocom/sgsn/sgsn_rim.h> |
| 32 | |
| 33 | /* call-back function for the BSSGP protocol */ |
| 34 | int sgsn_bssgp_rx_prim(struct osmo_prim_hdr *oph) |
| 35 | { |
| 36 | struct osmo_bssgp_prim *bp; |
| 37 | bp = container_of(oph, struct osmo_bssgp_prim, oph); |
| 38 | |
| 39 | switch (oph->sap) { |
| 40 | case SAP_BSSGP_LL: |
| 41 | switch (oph->primitive) { |
| 42 | case PRIM_BSSGP_UL_UD: |
| 43 | return gprs_llc_rcvmsg(oph->msg, bp->tp); |
| 44 | } |
| 45 | break; |
| 46 | case SAP_BSSGP_GMM: |
| 47 | switch (oph->primitive) { |
| 48 | case PRIM_BSSGP_GMM_SUSPEND: |
| 49 | return gprs_gmm_rx_suspend(bp->ra_id, bp->tlli); |
| 50 | case PRIM_BSSGP_GMM_RESUME: |
| 51 | return gprs_gmm_rx_resume(bp->ra_id, bp->tlli, |
| 52 | bp->u.resume.suspend_ref); |
| 53 | } |
| 54 | break; |
| 55 | case SAP_BSSGP_NM: |
| 56 | break; |
| 57 | case SAP_BSSGP_RIM: |
| 58 | return sgsn_rim_rx_from_gb(bp, oph->msg); |
| 59 | } |
| 60 | return 0; |
| 61 | } |
| 62 | |
| 63 | int sgsn_bssgp_page_ps_ra(struct sgsn_mm_ctx *mmctx) |
| 64 | { |
| 65 | struct bssgp_paging_info pinfo; |
| 66 | int rc; |
| 67 | |
| 68 | /* FIXME: page whole routing area, not only the last known cell */ |
| 69 | |
| 70 | /* initiate PS PAGING procedure */ |
| 71 | memset(&pinfo, 0, sizeof(pinfo)); |
| 72 | pinfo.mode = BSSGP_PAGING_PS; |
| 73 | pinfo.scope = BSSGP_PAGING_BVCI; |
| 74 | pinfo.bvci = mmctx->gb.bvci; |
| 75 | pinfo.imsi = mmctx->imsi; |
| 76 | pinfo.ptmsi = &mmctx->p_tmsi; |
| 77 | pinfo.drx_params = mmctx->drx_parms; |
| 78 | pinfo.qos[0] = 0; // FIXME |
| 79 | rc = bssgp_tx_paging(mmctx->gb.nsei, 0, &pinfo); |
| 80 | rate_ctr_inc(rate_ctr_group_get_ctr(mmctx->ctrg, GMM_CTR_PAGING_PS)); |
| 81 | |
| 82 | return rc; |
| 83 | } |
| 84 | |
| 85 | /* called by the bssgp layer to send NS PDUs */ |
| 86 | int sgsn_bssgp_dispatch_ns_unitdata_req_cb(void *ctx, struct msgb *msg) |
| 87 | { |
| 88 | struct gprs_ns2_inst *nsi = (struct gprs_ns2_inst *) ctx; |
| 89 | struct osmo_gprs_ns2_prim nsp = {}; |
| 90 | nsp.nsei = msgb_nsei(msg); |
| 91 | nsp.bvci = msgb_bvci(msg); |
| 92 | osmo_prim_init(&nsp.oph, SAP_NS, GPRS_NS2_PRIM_UNIT_DATA, PRIM_OP_REQUEST, msg); |
| 93 | return gprs_ns2_recv_prim(nsi, &nsp.oph); |
| 94 | } |