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Diffstat (limited to 'src/gprs_bssgp_pcu.cpp')
| -rw-r--r-- | src/gprs_bssgp_pcu.cpp | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/src/gprs_bssgp_pcu.cpp b/src/gprs_bssgp_pcu.cpp new file mode 100644 index 00000000..f0f71d89 --- /dev/null +++ b/src/gprs_bssgp_pcu.cpp @@ -0,0 +1,244 @@ +/* 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; + + budh = (struct bssgp_ud_hdr *)msgb_bssgph(msg); + struct gprs_rlcmac_tbf *tbf; + // Create new TBF + tfi = tfi_alloc(); + if (tfi < 0) { + return tfi; + } + tbf = tbf_alloc(tfi); + 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"); + } + + gsmtap_send_llc(tbf->rlc_data,tbf->data_index); + 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; +} |