| /* gprs_bssgp_pcu.cpp |
| * |
| * Copyright (C) 2012 Ivan Klyuchnikov |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version 2 |
| * 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| */ |
| |
| #include <gprs_rlcmac.h> |
| #include <gprs_bssgp_pcu.h> |
| #include <pcu_l1_if.h> |
| |
| struct sgsn_instance *sgsn; |
| void *tall_bsc_ctx; |
| struct bssgp_bvc_ctx *bctx = btsctx_alloc(BVCI, NSEI); |
| |
| int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp) |
| { |
| struct bssgp_ud_hdr *budh; |
| int tfi; |
| int i = 0; |
| uint8_t trx, ts; |
| |
| budh = (struct bssgp_ud_hdr *)msgb_bssgph(msg); |
| struct gprs_rlcmac_tbf *tbf; |
| // Create new TBF |
| tfi = tfi_alloc(); |
| if (tfi < 0) { |
| return tfi; |
| } |
| |
| /* FIXME: select right TRX/TS */ |
| if (select_pdch(&trx, &ts)) { |
| LOGP(DRLCMAC, LOGL_NOTICE, "No PDCH ressource\n"); |
| /* FIXME: send reject */ |
| return -EBUSY; |
| } |
| tbf = tbf_alloc(tfi, trx, ts); |
| tbf->direction = GPRS_RLCMAC_DL_TBF; |
| tbf->state = GPRS_RLCMAC_WAIT_DATA_SEQ_START; |
| tbf->tlli = ntohl(budh->tlli); |
| LOGP(DRLCMAC, LOGL_NOTICE, "TBF: [DOWNLINK] START TFI: %u TLLI: 0x%08x \n", tbf->tfi, tbf->tlli); |
| |
| /* LLC_PDU is mandatory IE */ |
| if (!TLVP_PRESENT(tp, BSSGP_IE_LLC_PDU)) |
| { |
| LOGP(DBSSGP, LOGL_ERROR, "BSSGP TLLI=0x%08x Rx UL-UD missing mandatory IE\n", tbf->tlli); |
| return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
| } |
| |
| uint8_t *llc_pdu = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_LLC_PDU); |
| tbf->data_index = TLVP_LEN(tp, BSSGP_IE_LLC_PDU); |
| |
| LOGP(DBSSGP, LOGL_NOTICE, "LLC PDU = "); |
| for (i = 0; i < tbf->data_index; i++) |
| { |
| tbf->rlc_data[i] = llc_pdu[i]; |
| LOGPC(DBSSGP, LOGL_NOTICE, "%02x", tbf->rlc_data[i]); |
| } |
| |
| uint16_t imsi_len = 0; |
| uint8_t *imsi; |
| if (TLVP_PRESENT(tp, BSSGP_IE_IMSI)) |
| { |
| imsi_len = TLVP_LEN(tp, BSSGP_IE_IMSI); |
| imsi = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_IMSI); |
| |
| LOGPC(DBSSGP, LOGL_NOTICE, " IMSI = "); |
| for (i = 0; i < imsi_len; i++) |
| { |
| LOGPC(DBSSGP, LOGL_NOTICE, "%02x", imsi[i]); |
| } |
| LOGPC(DBSSGP, LOGL_NOTICE, "\n"); |
| } |
| |
| gprs_rlcmac_packet_downlink_assignment(tbf); |
| |
| } |
| /* Receive a BSSGP PDU from a BSS on a PTP BVCI */ |
| int gprs_bssgp_pcu_rx_ptp(struct msgb *msg, struct tlv_parsed *tp, struct bssgp_bvc_ctx *bctx) |
| { |
| struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
| uint8_t pdu_type = bgph->pdu_type; |
| unsigned rc = 0; |
| |
| /* If traffic is received on a BVC that is marked as blocked, the |
| * received PDU shall not be accepted and a STATUS PDU (Cause value: |
| * BVC Blocked) shall be sent to the peer entity on the signalling BVC */ |
| if (bctx->state & BVC_S_BLOCKED && pdu_type != BSSGP_PDUT_STATUS) |
| { |
| uint16_t bvci = msgb_bvci(msg); |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BVC_S_BLOCKED\n"); |
| return bssgp_tx_status(BSSGP_CAUSE_BVCI_BLOCKED, &bvci, msg); |
| } |
| |
| switch (pdu_type) { |
| case BSSGP_PDUT_DL_UNITDATA: |
| LOGP(DBSSGP, LOGL_NOTICE, "RX: [SGSN->PCU] BSSGP_PDUT_DL_UNITDATA\n"); |
| gprs_bssgp_pcu_rx_dl_ud(msg, tp); |
| break; |
| case BSSGP_PDUT_PAGING_PS: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_PS\n"); |
| break; |
| case BSSGP_PDUT_PAGING_CS: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_CS\n"); |
| break; |
| case BSSGP_PDUT_RA_CAPA_UPDATE_ACK: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_RA_CAPA_UPDATE_ACK\n"); |
| break; |
| case BSSGP_PDUT_FLOW_CONTROL_BVC_ACK: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_FLOW_CONTROL_BVC_ACK\n"); |
| break; |
| case BSSGP_PDUT_FLOW_CONTROL_MS_ACK: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_FLOW_CONTROL_MS_ACK\n"); |
| break; |
| default: |
| DEBUGP(DBSSGP, "BSSGP BVCI=%u PDU type 0x%02x unknown\n", bctx->bvci, pdu_type); |
| rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
| break; |
| } |
| return rc; |
| } |
| |
| /* Receive a BSSGP PDU from a SGSN on a SIGNALLING BVCI */ |
| int gprs_bssgp_pcu_rx_sign(struct msgb *msg, struct tlv_parsed *tp, struct bssgp_bvc_ctx *bctx) |
| { |
| struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
| int rc = 0; |
| switch (bgph->pdu_type) { |
| case BSSGP_PDUT_STATUS: |
| /* Some exception has occurred */ |
| DEBUGP(DBSSGP, "BSSGP BVCI=%u Rx BVC STATUS\n", bctx->bvci); |
| /* FIXME: send NM_STATUS.ind to NM */ |
| break; |
| case BSSGP_PDUT_SUSPEND_ACK: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SUSPEND_ACK\n"); |
| break; |
| case BSSGP_PDUT_SUSPEND_NACK: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SUSPEND_NACK\n"); |
| break; |
| case BSSGP_PDUT_BVC_RESET_ACK: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_BVC_RESET_ACK\n"); |
| break; |
| case BSSGP_PDUT_PAGING_PS: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_PS\n"); |
| break; |
| case BSSGP_PDUT_PAGING_CS: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_CS\n"); |
| break; |
| case BSSGP_PDUT_RESUME_ACK: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_RESUME_ACK\n"); |
| break; |
| case BSSGP_PDUT_RESUME_NACK: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_RESUME_NACK\n"); |
| break; |
| case BSSGP_PDUT_FLUSH_LL: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_FLUSH_LL\n"); |
| break; |
| case BSSGP_PDUT_BVC_BLOCK_ACK: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SUSPEND_ACK\n"); |
| break; |
| case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_BVC_UNBLOCK_ACK\n"); |
| break; |
| case BSSGP_PDUT_SGSN_INVOKE_TRACE: |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SGSN_INVOKE_TRACE\n"); |
| break; |
| default: |
| DEBUGP(DBSSGP, "BSSGP BVCI=%u Rx PDU type 0x%02x unknown\n", bctx->bvci, bgph->pdu_type); |
| rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
| break; |
| } |
| return rc; |
| } |
| |
| int gprs_bssgp_pcu_rcvmsg(struct msgb *msg) |
| { |
| struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
| struct bssgp_ud_hdr *budh = (struct bssgp_ud_hdr *) msgb_bssgph(msg); |
| struct tlv_parsed tp; |
| uint8_t pdu_type = bgph->pdu_type; |
| uint16_t ns_bvci = msgb_bvci(msg); |
| int data_len; |
| int rc = 0; |
| |
| /* Identifiers from DOWN: NSEI, BVCI (both in msg->cb) */ |
| |
| /* UNITDATA BSSGP headers have TLLI in front */ |
| if (pdu_type != BSSGP_PDUT_UL_UNITDATA && pdu_type != BSSGP_PDUT_DL_UNITDATA) |
| { |
| data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
| rc = bssgp_tlv_parse(&tp, bgph->data, data_len); |
| } |
| else |
| { |
| data_len = msgb_bssgp_len(msg) - sizeof(*budh); |
| rc = bssgp_tlv_parse(&tp, budh->data, data_len); |
| } |
| |
| /* look-up or create the BTS context for this BVC */ |
| bctx = btsctx_by_bvci_nsei(ns_bvci, msgb_nsei(msg)); |
| |
| /* Only a RESET PDU can create a new BVC context */ |
| if (!bctx) |
| { |
| bctx = btsctx_alloc(ns_bvci, msgb_nsei(msg)); |
| } |
| |
| if (!bctx && pdu_type != BSSGP_PDUT_BVC_RESET_ACK) |
| { |
| LOGP(DBSSGP, LOGL_NOTICE, "NSEI=%u/BVCI=%u Rejecting PDU " |
| "type %u for unknown BVCI\n", msgb_nsei(msg), ns_bvci, |
| pdu_type); |
| return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg); |
| } |
| |
| if (bctx) |
| { |
| log_set_context(BSC_CTX_BVC, bctx); |
| rate_ctr_inc(&bctx->ctrg->ctr[BSSGP_CTR_PKTS_IN]); |
| rate_ctr_add(&bctx->ctrg->ctr[BSSGP_CTR_BYTES_IN], msgb_bssgp_len(msg)); |
| } |
| |
| if (ns_bvci == BVCI_SIGNALLING) |
| { |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BVCI_SIGNALLING gprs_bssgp_rx_sign\n"); |
| rc = gprs_bssgp_pcu_rx_sign(msg, &tp, bctx); |
| } |
| else if (ns_bvci == BVCI_PTM) |
| { |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BVCI_PTM bssgp_tx_status\n"); |
| rc = bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_FEAT, NULL, msg); |
| } |
| else |
| { |
| LOGP(DBSSGP, LOGL_NOTICE, "rx BVCI_PTP gprs_bssgp_rx_ptp\n"); |
| rc = gprs_bssgp_pcu_rx_ptp(msg, &tp, bctx); |
| } |
| return rc; |
| } |