235 lines
7.1 KiB
C++
235 lines
7.1 KiB
C++
/* gprs_bssgp_pcu.cpp
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*
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* Copyright (C) 2012 Ivan Klyuchnikov
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <gprs_rlcmac.h>
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#include <gprs_bssgp_pcu.h>
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#include <pcu_l1_if.h>
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struct sgsn_instance *sgsn;
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void *tall_bsc_ctx;
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struct bssgp_bvc_ctx *bctx = btsctx_alloc(BVCI, NSEI);
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int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp)
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{
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struct bssgp_ud_hdr *budh;
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int i = 0;
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budh = (struct bssgp_ud_hdr *)msgb_bssgph(msg);
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struct gprs_rlcmac_tbf *tbf;
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tbf = tbf_alloc(GPRS_RLCMAC_DL_TBF, ntohl(budh->tlli));
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if (!tbf)
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{
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return -1;
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}
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/* LLC_PDU is mandatory IE */
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if (!TLVP_PRESENT(tp, BSSGP_IE_LLC_PDU))
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{
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LOGP(DBSSGP, LOGL_ERROR, "BSSGP TLLI=0x%08x Rx UL-UD missing mandatory IE\n", tbf->tlli);
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return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg);
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}
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uint16_t imsi_len = 0;
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uint8_t *imsi = NULL;
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if (TLVP_PRESENT(tp, BSSGP_IE_IMSI))
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{
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imsi_len = TLVP_LEN(tp, BSSGP_IE_IMSI);
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imsi = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_IMSI);
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LOGPC(DBSSGP, LOGL_NOTICE, " IMSI = ");
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for (i = 0; i < imsi_len; i++)
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{
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LOGPC(DBSSGP, LOGL_NOTICE, "%02x", imsi[i]);
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}
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LOGP(DBSSGP, LOGL_NOTICE, "\n");
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}
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tbf_dl_establish(tbf, imsi);
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uint8_t *llc_pdu = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_LLC_PDU);
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uint16_t llc_pdu_len = TLVP_LEN(tp, BSSGP_IE_LLC_PDU);
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tbf_dl_data_transfer(tbf, llc_pdu, llc_pdu_len);
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}
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/* Receive a BSSGP PDU from a BSS on a PTP BVCI */
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int gprs_bssgp_pcu_rx_ptp(struct msgb *msg, struct tlv_parsed *tp, struct bssgp_bvc_ctx *bctx)
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{
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struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg);
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uint8_t pdu_type = bgph->pdu_type;
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unsigned rc = 0;
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/* If traffic is received on a BVC that is marked as blocked, the
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* received PDU shall not be accepted and a STATUS PDU (Cause value:
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* BVC Blocked) shall be sent to the peer entity on the signalling BVC */
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if (bctx->state & BVC_S_BLOCKED && pdu_type != BSSGP_PDUT_STATUS)
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{
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uint16_t bvci = msgb_bvci(msg);
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LOGP(DBSSGP, LOGL_NOTICE, "rx BVC_S_BLOCKED\n");
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return bssgp_tx_status(BSSGP_CAUSE_BVCI_BLOCKED, &bvci, msg);
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}
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switch (pdu_type) {
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case BSSGP_PDUT_DL_UNITDATA:
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LOGP(DBSSGP, LOGL_NOTICE, "RX: [SGSN->PCU] BSSGP_PDUT_DL_UNITDATA\n");
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gprs_bssgp_pcu_rx_dl_ud(msg, tp);
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break;
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case BSSGP_PDUT_PAGING_PS:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_PS\n");
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break;
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case BSSGP_PDUT_PAGING_CS:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_CS\n");
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break;
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case BSSGP_PDUT_RA_CAPA_UPDATE_ACK:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_RA_CAPA_UPDATE_ACK\n");
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break;
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case BSSGP_PDUT_FLOW_CONTROL_BVC_ACK:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_FLOW_CONTROL_BVC_ACK\n");
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break;
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case BSSGP_PDUT_FLOW_CONTROL_MS_ACK:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_FLOW_CONTROL_MS_ACK\n");
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break;
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default:
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DEBUGP(DBSSGP, "BSSGP BVCI=%u PDU type 0x%02x unknown\n", bctx->bvci, pdu_type);
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rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg);
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break;
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}
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return rc;
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}
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/* Receive a BSSGP PDU from a SGSN on a SIGNALLING BVCI */
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int gprs_bssgp_pcu_rx_sign(struct msgb *msg, struct tlv_parsed *tp, struct bssgp_bvc_ctx *bctx)
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{
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struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg);
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int rc = 0;
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switch (bgph->pdu_type) {
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case BSSGP_PDUT_STATUS:
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/* Some exception has occurred */
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DEBUGP(DBSSGP, "BSSGP BVCI=%u Rx BVC STATUS\n", bctx->bvci);
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/* FIXME: send NM_STATUS.ind to NM */
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break;
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case BSSGP_PDUT_SUSPEND_ACK:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SUSPEND_ACK\n");
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break;
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case BSSGP_PDUT_SUSPEND_NACK:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SUSPEND_NACK\n");
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break;
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case BSSGP_PDUT_BVC_RESET_ACK:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_BVC_RESET_ACK\n");
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break;
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case BSSGP_PDUT_PAGING_PS:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_PS\n");
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break;
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case BSSGP_PDUT_PAGING_CS:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_PAGING_CS\n");
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break;
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case BSSGP_PDUT_RESUME_ACK:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_RESUME_ACK\n");
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break;
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case BSSGP_PDUT_RESUME_NACK:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_RESUME_NACK\n");
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break;
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case BSSGP_PDUT_FLUSH_LL:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_FLUSH_LL\n");
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break;
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case BSSGP_PDUT_BVC_BLOCK_ACK:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SUSPEND_ACK\n");
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break;
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case BSSGP_PDUT_BVC_UNBLOCK_ACK:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_BVC_UNBLOCK_ACK\n");
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break;
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case BSSGP_PDUT_SGSN_INVOKE_TRACE:
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LOGP(DBSSGP, LOGL_NOTICE, "rx BSSGP_PDUT_SGSN_INVOKE_TRACE\n");
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break;
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default:
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DEBUGP(DBSSGP, "BSSGP BVCI=%u Rx PDU type 0x%02x unknown\n", bctx->bvci, bgph->pdu_type);
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rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg);
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break;
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}
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return rc;
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}
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int gprs_bssgp_pcu_rcvmsg(struct msgb *msg)
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{
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struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg);
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struct bssgp_ud_hdr *budh = (struct bssgp_ud_hdr *) msgb_bssgph(msg);
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struct tlv_parsed tp;
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uint8_t pdu_type = bgph->pdu_type;
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uint16_t ns_bvci = msgb_bvci(msg);
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int data_len;
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int rc = 0;
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/* Identifiers from DOWN: NSEI, BVCI (both in msg->cb) */
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/* UNITDATA BSSGP headers have TLLI in front */
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if (pdu_type != BSSGP_PDUT_UL_UNITDATA && pdu_type != BSSGP_PDUT_DL_UNITDATA)
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{
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data_len = msgb_bssgp_len(msg) - sizeof(*bgph);
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rc = bssgp_tlv_parse(&tp, bgph->data, data_len);
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}
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else
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{
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data_len = msgb_bssgp_len(msg) - sizeof(*budh);
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rc = bssgp_tlv_parse(&tp, budh->data, data_len);
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}
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/* look-up or create the BTS context for this BVC */
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bctx = btsctx_by_bvci_nsei(ns_bvci, msgb_nsei(msg));
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/* Only a RESET PDU can create a new BVC context */
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if (!bctx)
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{
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bctx = btsctx_alloc(ns_bvci, msgb_nsei(msg));
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}
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if (!bctx && pdu_type != BSSGP_PDUT_BVC_RESET_ACK)
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{
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LOGP(DBSSGP, LOGL_NOTICE, "NSEI=%u/BVCI=%u Rejecting PDU "
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"type %u for unknown BVCI\n", msgb_nsei(msg), ns_bvci,
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pdu_type);
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return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg);
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}
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if (bctx)
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{
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log_set_context(BSC_CTX_BVC, bctx);
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rate_ctr_inc(&bctx->ctrg->ctr[BSSGP_CTR_PKTS_IN]);
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rate_ctr_add(&bctx->ctrg->ctr[BSSGP_CTR_BYTES_IN], msgb_bssgp_len(msg));
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}
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if (ns_bvci == BVCI_SIGNALLING)
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{
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LOGP(DBSSGP, LOGL_NOTICE, "rx BVCI_SIGNALLING gprs_bssgp_rx_sign\n");
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rc = gprs_bssgp_pcu_rx_sign(msg, &tp, bctx);
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}
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else if (ns_bvci == BVCI_PTM)
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{
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LOGP(DBSSGP, LOGL_NOTICE, "rx BVCI_PTM bssgp_tx_status\n");
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rc = bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_FEAT, NULL, msg);
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}
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else
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{
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LOGP(DBSSGP, LOGL_NOTICE, "rx BVCI_PTP gprs_bssgp_rx_ptp\n");
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rc = gprs_bssgp_pcu_rx_ptp(msg, &tp, bctx);
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}
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return rc;
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}
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