/* 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 #include #include 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 bssgp_ud_hdr *budh; int tfi; int data_index = 0; int i = 0; int pdu_index = 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(DBSSGP, LOGL_NOTICE, "rx BSSGP TLLI=0x%08x \n", ntohl(budh->tlli)); for (i = 4; i < MAX_LEN_PDU; i++) { //LOGP(DBSSGP, LOGL_NOTICE, "SERCH data = -0x%02x\n", budh ->data[i]); if(budh->data[i] == IE_PDU) { pdu_index = i + 2; break; } } for (i = pdu_index; i < pdu_index + (budh->data[pdu_index-1]&0x7f); i++) { //LOGP(DBSSGP, LOGL_NOTICE, "-0x%02x\n", budh ->data[i]); tbf->rlc_data[data_index] = budh->data[i]; data_index++; } DEBUGP(DBSSGP, "BSSGP Catch from SGSN=%u octets. Send it to OpenBTS.\n", data_index); gsmtap_send_llc(tbf->rlc_data,data_index); tbf->data_index = data_index; gprs_rlcmac_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 BSSGP_PDUT_DL_UNITDATA\n"); gprs_bssgp_pcu_rx_dl_ud(msg); 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; }