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/* 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;
}
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