Convert gprs_bssgp_pcu.cpp to C
There's no real use of C++ in that file, and it causes problems when
using llist_head entry macros in future patches adding initial support
for multiple BTS in PCU object, so let's move it to plain C.
Change-Id: Ic771a89fd78b5e66151a5384f0ff6a8895589466
diff --git a/src/gprs_bssgp_pcu.c b/src/gprs_bssgp_pcu.c
new file mode 100644
index 0000000..288bc45
--- /dev/null
+++ b/src/gprs_bssgp_pcu.c
@@ -0,0 +1,1194 @@
+/* gprs_bssgp_pcu.cpp
+ *
+ * Copyright (C) 2012 Ivan Klyuchnikov
+ * Copyright (C) 2013 by Holger Hans Peter Freyther
+ *
+ * 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>
+#include <gprs_debug.h>
+#include <bts.h>
+#include <tbf.h>
+#include <coding_scheme.h>
+#include <pdch.h>
+#include <decoding.h>
+
+#include <osmocom/gprs/gprs_ns2.h>
+#include <osmocom/gsm/protocol/gsm_23_003.h>
+#include <osmocom/gprs/protocol/gsm_08_16.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/gsm/gsm48.h>
+#include "coding_scheme.h"
+#include "tbf_dl.h"
+#include "llc.h"
+#include "gprs_rlcmac.h"
+
+/* Tuning parameters for BSSGP flow control */
+#define FC_DEFAULT_LIFE_TIME_SECS 10 /* experimental value, 10s */
+#define FC_MS_BUCKET_SIZE_BY_BMAX(bmax) ((bmax) / 2 + 500) /* experimental */
+#define FC_FALLBACK_BVC_BUCKET_SIZE 2000 /* e.g. on R = 0, value taken from PCAP files */
+#define FC_MS_MAX_RX_SLOTS 4 /* limit MS default R to 4 TS per MS */
+
+/* Constants for BSSGP flow control */
+#define FC_MAX_BUCKET_LEAK_RATE (6553500 / 8) /* Byte/s */
+#define FC_MAX_BUCKET_SIZE 6553500 /* Octets */
+
+extern void *tall_pcu_ctx;
+extern uint16_t spoof_mcc, spoof_mnc;
+extern bool spoof_mnc_3_digits;
+
+static void bvc_timeout(void *_priv);
+
+static int parse_ra_cap(struct tlv_parsed *tp, MS_Radio_Access_capability_t *rac)
+{
+ struct bitvec *block;
+ uint8_t cap_len;
+ uint8_t *cap;
+
+ memset(rac, 0, sizeof(*rac));
+
+ if (!TLVP_PRESENT(tp, BSSGP_IE_MS_RADIO_ACCESS_CAP))
+ return -EINVAL;
+
+ cap_len = TLVP_LEN(tp, BSSGP_IE_MS_RADIO_ACCESS_CAP);
+ cap = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_MS_RADIO_ACCESS_CAP);
+
+ LOGP(DBSSGP, LOGL_DEBUG, "Got BSSGP RA Capability of size %d\n", cap_len);
+
+ block = bitvec_alloc(cap_len, tall_pcu_ctx);
+ bitvec_unpack(block, cap);
+
+ /* TS 24.008, 10.5.5.12a */
+ decode_gsm_ra_cap(block, rac);
+
+ bitvec_free(block);
+ return 0;
+}
+
+static int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp)
+{
+ struct bssgp_ud_hdr *budh;
+
+ uint32_t tlli;
+ uint32_t tlli_old = GSM_RESERVED_TMSI;
+ uint8_t *data;
+ uint16_t len;
+ uint8_t ms_class = 0;
+ uint8_t egprs_ms_class = 0;
+ int rc;
+ MS_Radio_Access_capability_t rac;
+ /* TODO: is it really necessary to initialize this as a "000" IMSI? It seems, the function should just return an
+ * error if no IMSI IE was found. */
+ struct osmo_mobile_identity mi_imsi = {
+ .type = GSM_MI_TYPE_TMSI,
+ };
+ OSMO_STRLCPY_ARRAY(mi_imsi.imsi, "000");
+
+ budh = (struct bssgp_ud_hdr *)msgb_bssgph(msg);
+ tlli = ntohl(budh->tlli);
+
+ /* LLC_PDU is mandatory IE */
+ if (!TLVP_PRESENT(tp, BSSGP_IE_LLC_PDU))
+ {
+ LOGP(DBSSGP, LOGL_NOTICE, "BSSGP TLLI=0x%08x Rx UL-UD missing mandatory IE\n", tlli);
+ return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg);
+ }
+
+ data = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_LLC_PDU);
+ len = TLVP_LEN(tp, BSSGP_IE_LLC_PDU);
+ if (len > LLC_MAX_LEN)
+ {
+ LOGP(DBSSGP, LOGL_NOTICE, "BSSGP TLLI=0x%08x Rx UL-UD IE_LLC_PDU too large\n", tlli);
+ return bssgp_tx_status(BSSGP_CAUSE_COND_IE_ERR, NULL, msg);
+ }
+
+ /* read IMSI. if no IMSI exists, use first paging block (any paging),
+ * because during attachment the IMSI might not be known, so the MS
+ * will listen to all paging blocks. */
+ if (TLVP_PRESENT(tp, BSSGP_IE_IMSI))
+ {
+ rc = osmo_mobile_identity_decode(&mi_imsi, TLVP_VAL(tp, BSSGP_IE_IMSI), TLVP_LEN(tp, BSSGP_IE_IMSI),
+ true);
+ if (rc < 0 || mi_imsi.type != GSM_MI_TYPE_IMSI) {
+ LOGP(DBSSGP, LOGL_NOTICE, "Failed to parse IMSI IE (rc=%d)\n", rc);
+ return bssgp_tx_status(BSSGP_CAUSE_COND_IE_ERR, NULL, msg);
+ }
+ }
+
+ /* parse ms radio access capability */
+ if (parse_ra_cap(tp, &rac) >= 0) {
+ /* Get the EGPRS class from the RA capability */
+ ms_class = get_ms_class_by_capability(&rac);
+ egprs_ms_class = get_egprs_ms_class_by_capability(&rac);
+ LOGP(DBSSGP, LOGL_DEBUG, "Got downlink MS class %d/%d\n",
+ ms_class, egprs_ms_class);
+ }
+
+ /* get lifetime */
+ uint16_t delay_csec = 0xffff;
+ if (TLVP_PRESENT(tp, BSSGP_IE_PDU_LIFETIME))
+ {
+ uint8_t lt_len = TLVP_LEN(tp, BSSGP_IE_PDU_LIFETIME);
+ if (lt_len == 2)
+ delay_csec = tlvp_val16be(tp, BSSGP_IE_PDU_LIFETIME);
+ else
+ LOGP(DBSSGP, LOGL_NOTICE, "BSSGP invalid length of "
+ "PDU_LIFETIME IE\n");
+ } else
+ LOGP(DBSSGP, LOGL_NOTICE, "BSSGP missing mandatory "
+ "PDU_LIFETIME IE\n");
+
+ /* get optional TLLI old */
+ if (TLVP_PRESENT(tp, BSSGP_IE_TLLI))
+ {
+ uint8_t tlli_len = TLVP_LEN(tp, BSSGP_IE_PDU_LIFETIME);
+ if (tlli_len == 2)
+ tlli_old = tlvp_val16be(tp, BSSGP_IE_TLLI);
+ else
+ LOGP(DBSSGP, LOGL_NOTICE, "BSSGP invalid length of "
+ "TLLI (old) IE\n");
+ }
+
+ LOGP(DBSSGP, LOGL_INFO, "LLC [SGSN -> PCU] = TLLI: 0x%08x IMSI: %s len: %d\n", tlli, mi_imsi.imsi, len);
+
+ return dl_tbf_handle(the_pcu->bssgp.bts, tlli, tlli_old, mi_imsi.imsi,
+ ms_class, egprs_ms_class, delay_csec, data, len);
+}
+
+/* Returns 0 on success, suggested BSSGP cause otherwise */
+static unsigned int get_paging_mi(struct osmo_mobile_identity *mi, const struct tlv_parsed *tp)
+{
+ /* Use TMSI (if present) or IMSI */
+ if (TLVP_PRESENT(tp, BSSGP_IE_TMSI)) {
+ /* Be safe against an evil SGSN - check the length */
+ if (TLVP_LEN(tp, BSSGP_IE_TMSI) != GSM23003_TMSI_NUM_BYTES) {
+ LOGP(DBSSGP, LOGL_NOTICE, "TMSI IE has odd length (!= 4)\n");
+ return BSSGP_CAUSE_COND_IE_ERR;
+ }
+
+ /* NOTE: TMSI (unlike IMSI) IE comes without MI type header */
+ *mi = (struct osmo_mobile_identity){
+ .type = GSM_MI_TYPE_TMSI,
+ };
+ mi->tmsi = osmo_load32be(TLVP_VAL(tp, BSSGP_IE_TMSI));
+ } else if (TLVP_PRESENT(tp, BSSGP_IE_IMSI)) {
+ int rc = osmo_mobile_identity_decode(mi, TLVP_VAL(tp, BSSGP_IE_IMSI), TLVP_LEN(tp, BSSGP_IE_IMSI),
+ true);
+ if (rc < 0 || mi->type != GSM_MI_TYPE_IMSI) {
+ LOGP(DBSSGP, LOGL_ERROR, "Invalid IMSI Mobile Identity\n");
+ return BSSGP_CAUSE_COND_IE_ERR;
+ }
+ } else {
+ LOGP(DBSSGP, LOGL_ERROR, "Neither TMSI IE nor IMSI IE is present\n");
+ return BSSGP_CAUSE_MISSING_COND_IE;
+ }
+
+ return 0;
+}
+
+static int gprs_bssgp_pcu_rx_paging_cs(struct msgb *msg, const struct tlv_parsed *tp)
+{
+ struct osmo_mobile_identity mi;
+ int rc;
+
+ if ((rc = get_paging_mi(&mi, tp)) > 0)
+ return bssgp_tx_status((enum gprs_bssgp_cause) rc, NULL, msg);
+
+ return bts_add_paging(the_pcu->bts, tlvp_val8(tp, BSSGP_IE_CHAN_NEEDED, 0), &mi);
+}
+
+static int gprs_bssgp_pcu_rx_paging_ps(struct msgb *msg, const struct tlv_parsed *tp)
+{
+ struct osmo_mobile_identity mi_imsi;
+ struct osmo_mobile_identity paging_mi;
+ uint16_t pgroup;
+ int rc;
+
+ if (!TLVP_PRESENT(tp, BSSGP_IE_IMSI)) {
+ LOGP(DBSSGP, LOGL_ERROR, "No IMSI\n");
+ return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg);
+ }
+
+ rc = osmo_mobile_identity_decode(&mi_imsi, TLVP_VAL(tp, BSSGP_IE_IMSI), TLVP_LEN(tp, BSSGP_IE_IMSI), true);
+ if (rc < 0 || mi_imsi.type != GSM_MI_TYPE_IMSI) {
+ LOGP(DBSSGP, LOGL_NOTICE, "Failed to parse IMSI IE (rc=%d)\n", rc);
+ return bssgp_tx_status(BSSGP_CAUSE_INV_MAND_INF, NULL, msg);
+ }
+ pgroup = imsi2paging_group(mi_imsi.imsi);
+ if (pgroup > 999) {
+ LOGP(DBSSGP, LOGL_NOTICE, "Failed to compute IMSI %s paging group\n", mi_imsi.imsi);
+ return bssgp_tx_status(BSSGP_CAUSE_INV_MAND_INF, NULL, msg);
+ }
+
+ if ((rc = get_paging_mi(&paging_mi, tp)) > 0)
+ return bssgp_tx_status((enum gprs_bssgp_cause) rc, NULL, msg);
+
+ return gprs_rlcmac_paging_request(&paging_mi, pgroup);
+}
+
+/* Receive a BSSGP PDU from a BSS on a PTP BVCI */
+static 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);
+ enum bssgp_pdu_type pdu_type = (enum bssgp_pdu_type) bgph->pdu_type;
+ int bvci = bctx ? bctx->bvci : -1;
+ unsigned rc = 0;
+
+ if (!bctx)
+ return -EINVAL;
+
+ /* 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_STATUS:
+ /* already handled in libosmogb */
+ OSMO_ASSERT(0);
+ break;
+ case BSSGP_PDUT_DL_UNITDATA:
+ LOGP(DBSSGP, LOGL_DEBUG, "Rx BSSGP BVCI=%d (PTP) DL_UNITDATA\n", bvci);
+ if (the_pcu->bssgp.on_dl_unit_data)
+ the_pcu->bssgp.on_dl_unit_data(&the_pcu->bssgp, msg, tp);
+ gprs_bssgp_pcu_rx_dl_ud(msg, tp);
+ break;
+ case BSSGP_PDUT_FLOW_CONTROL_BVC_ACK:
+ case BSSGP_PDUT_FLOW_CONTROL_MS_ACK:
+ LOGP(DBSSGP, LOGL_DEBUG, "Rx BSSGP BVCI=%d (PTP) %s\n",
+ bvci, bssgp_pdu_str(pdu_type));
+ break;
+ case BSSGP_PDUT_PAGING_CS:
+ gprs_bssgp_pcu_rx_paging_cs(msg, tp);
+ break;
+ case BSSGP_PDUT_PAGING_PS:
+ gprs_bssgp_pcu_rx_paging_ps(msg, tp);
+ break;
+ case BSSGP_PDUT_RA_CAPABILITY:
+ case BSSGP_PDUT_RA_CAPA_UPDATE_ACK:
+ LOGP(DBSSGP, LOGL_INFO, "Rx BSSGP BVCI=%d (PTP) PDU type %s not implemented\n",
+ bvci, bssgp_pdu_str(pdu_type));
+ break;
+ /* See TS 08.18 5.4.1 */
+ case BSSGP_PDUT_SUSPEND:
+ case BSSGP_PDUT_SUSPEND_ACK:
+ case BSSGP_PDUT_SUSPEND_NACK:
+ case BSSGP_PDUT_RESUME:
+ case BSSGP_PDUT_RESUME_ACK:
+ case BSSGP_PDUT_RESUME_NACK:
+ case BSSGP_PDUT_FLUSH_LL:
+ case BSSGP_PDUT_FLUSH_LL_ACK:
+ case BSSGP_PDUT_LLC_DISCARD:
+ case BSSGP_PDUT_BVC_BLOCK:
+ case BSSGP_PDUT_BVC_BLOCK_ACK:
+ case BSSGP_PDUT_BVC_UNBLOCK:
+ case BSSGP_PDUT_BVC_UNBLOCK_ACK:
+ case BSSGP_PDUT_BVC_RESET:
+ case BSSGP_PDUT_BVC_RESET_ACK:
+ case BSSGP_PDUT_SGSN_INVOKE_TRACE:
+ LOGP(DBSSGP, LOGL_NOTICE, "Rx BSSGP BVCI=%u (PTP) PDU type %s unexpected at PTP\n",
+ bctx->bvci, bssgp_pdu_str(pdu_type));
+ rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg);
+ break;
+ default:
+ LOGP(DBSSGP, LOGL_NOTICE, "Rx BSSGP BVCI=%u (PTP) PDU type %s unknown\n",
+ bctx->bvci, bssgp_pdu_str(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 */
+static 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);
+ enum bssgp_pdu_type pdu_type = (enum bssgp_pdu_type) bgph->pdu_type;
+ int rc = 0;
+ int bvci = bctx ? bctx->bvci : msgb_bvci(msg);
+ switch (pdu_type) {
+ case BSSGP_PDUT_STATUS:
+ /* already handled in libosmogb */
+ OSMO_ASSERT(0);
+ break;
+ case BSSGP_PDUT_SUSPEND_ACK:
+ case BSSGP_PDUT_RESUME_ACK:
+ case BSSGP_PDUT_BVC_BLOCK_ACK:
+ LOGP(DBSSGP, LOGL_DEBUG, "Rx BSSGP BVCI=%d (SIGN) %s\n",
+ bvci, bssgp_pdu_str(pdu_type));
+ break;
+ case BSSGP_PDUT_BVC_RESET_ACK:
+ LOGP(DBSSGP, LOGL_NOTICE, "Rx BSSGP BVCI=%d (SIGN) BVC_RESET_ACK\n", bvci);
+ if (!the_pcu->bssgp.bvc_sig_reset)
+ the_pcu->bssgp.bvc_sig_reset = 1;
+ else
+ the_pcu->bssgp.bvc_reset = 1;
+ bvc_timeout(NULL);
+ break;
+ case BSSGP_PDUT_PAGING_CS:
+ gprs_bssgp_pcu_rx_paging_cs(msg, tp);
+ break;
+ case BSSGP_PDUT_PAGING_PS:
+ gprs_bssgp_pcu_rx_paging_ps(msg, tp);
+ break;
+ case BSSGP_PDUT_BVC_UNBLOCK_ACK:
+ LOGP(DBSSGP, LOGL_NOTICE, "Rx BSSGP BVCI=%d (SIGN) BVC_UNBLOCK_ACK\n", bvci);
+ the_pcu->bssgp.bvc_unblocked = 1;
+ if (the_pcu->bssgp.on_unblock_ack)
+ the_pcu->bssgp.on_unblock_ack(&the_pcu->bssgp);
+ bvc_timeout(NULL);
+ break;
+ case BSSGP_PDUT_SUSPEND_NACK:
+ case BSSGP_PDUT_RESUME_NACK:
+ case BSSGP_PDUT_FLUSH_LL:
+ case BSSGP_PDUT_SGSN_INVOKE_TRACE:
+ LOGP(DBSSGP, LOGL_INFO, "Rx BSSGP BVCI=%d (SIGN) PDU type %s not implemented\n",
+ bvci, bssgp_pdu_str(pdu_type));
+ break;
+ /* See TS 08.18 5.4.1 */
+ case BSSGP_PDUT_UL_UNITDATA:
+ case BSSGP_PDUT_DL_UNITDATA:
+ case BSSGP_PDUT_RA_CAPABILITY:
+ case BSSGP_PDUT_PTM_UNITDATA:
+ case BSSGP_PDUT_RA_CAPA_UDPATE:
+ case BSSGP_PDUT_RA_CAPA_UPDATE_ACK:
+ case BSSGP_PDUT_RADIO_STATUS:
+ case BSSGP_PDUT_FLOW_CONTROL_BVC:
+ case BSSGP_PDUT_FLOW_CONTROL_BVC_ACK:
+ case BSSGP_PDUT_FLOW_CONTROL_MS:
+ case BSSGP_PDUT_FLOW_CONTROL_MS_ACK:
+ case BSSGP_PDUT_DOWNLOAD_BSS_PFC:
+ case BSSGP_PDUT_CREATE_BSS_PFC:
+ case BSSGP_PDUT_CREATE_BSS_PFC_ACK:
+ case BSSGP_PDUT_CREATE_BSS_PFC_NACK:
+ case BSSGP_PDUT_MODIFY_BSS_PFC:
+ case BSSGP_PDUT_MODIFY_BSS_PFC_ACK:
+ case BSSGP_PDUT_DELETE_BSS_PFC:
+ case BSSGP_PDUT_DELETE_BSS_PFC_ACK:
+ LOGP(DBSSGP, LOGL_NOTICE, "Rx BSSGP BVCI=%d (SIGN) PDU type %s unexpected at SIGN\n",
+ bvci, bssgp_pdu_str(pdu_type));
+ break;
+ default:
+ LOGP(DBSSGP, LOGL_NOTICE, "Rx BSSGP BVCI=%d (SIGN) PDU type %s unknown\n",
+ bvci, bssgp_pdu_str(pdu_type));
+ rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg);
+ break;
+ }
+ return rc;
+}
+
+static 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;
+ enum bssgp_pdu_type pdu_type = (enum bssgp_pdu_type) bgph->pdu_type;
+ enum gprs_bssgp_cause cause = BSSGP_CAUSE_OML_INTERV;
+ uint16_t ns_bvci = msgb_bvci(msg), nsei = msgb_nsei(msg);
+ int data_len;
+ int rc = 0;
+ struct bssgp_bvc_ctx *bctx;
+
+ if (pdu_type == BSSGP_PDUT_STATUS)
+ /* Pass the message to the generic BSSGP parser, which handles
+ * STATUS and RESET messages in either direction. */
+ return bssgp_rcvmsg(msg);
+
+ /* 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);
+ }
+ if (rc < 0) {
+ LOGP(DBSSGP, LOGL_ERROR, "Failed to parse BSSGP %s message. Invalid message was: %s\n",
+ bssgp_pdu_str(pdu_type), msgb_hexdump(msg));
+ return bssgp_tx_status(BSSGP_CAUSE_INV_MAND_INF, NULL, msg);
+ }
+
+ if (pdu_type == BSSGP_PDUT_BVC_RESET) {
+ rc = bssgp_rcvmsg(msg);
+ if (ns_bvci != BVCI_SIGNALLING)
+ return rc;
+
+ if (TLVP_PRES_LEN(&tp, BSSGP_IE_CAUSE, 1))
+ cause = (enum gprs_bssgp_cause)*TLVP_VAL(&tp, BSSGP_IE_CAUSE);
+ else
+ LOGP(DBSSGP, LOGL_ERROR, "NSEI=%u BVC RESET without cause?!\n", nsei);
+
+ rc = bssgp_tx_bvc_ptp_reset(nsei, cause);
+ if (rc < 0)
+ LOGP(DBSSGP, LOGL_ERROR, "NSEI=%u BVC PTP reset procedure failed: %d\n", nsei, rc);
+
+ return rc;
+ }
+
+ /* look-up or create the BTS context for this BVC */
+ bctx = btsctx_by_bvci_nsei(ns_bvci, msgb_nsei(msg));
+
+ if (!bctx && ns_bvci != BVCI_SIGNALLING)
+ {
+ LOGP(DBSSGP, LOGL_NOTICE, "NSEI=%u/BVCI=%u Rejecting PDU type %s for unknown BVCI\n",
+ nsei, ns_bvci, bssgp_pdu_str(pdu_type));
+ return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg);
+ }
+
+ if (bctx)
+ {
+ log_set_context(LOG_CTX_GB_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_DEBUG, "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_DEBUG, "rx BVCI_PTM bssgp_tx_status\n");
+ rc = bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_FEAT, NULL, msg);
+ }
+ else
+ {
+ LOGP(DBSSGP, LOGL_DEBUG, "rx BVCI_PTP=%u gprs_bssgp_rx_ptp\n", ns_bvci);
+ rc = gprs_bssgp_pcu_rx_ptp(msg, &tp, bctx);
+ }
+ return rc;
+}
+
+static void handle_nm_status(struct osmo_bssgp_prim *bp)
+{
+ enum gprs_bssgp_cause cause;
+
+ LOGP(DPCU, LOGL_DEBUG,
+ "Got NM-STATUS.ind, BVCI=%d, NSEI=%d\n",
+ bp->bvci, bp->nsei);
+
+ if (!TLVP_PRESENT(bp->tp, BSSGP_IE_CAUSE))
+ return;
+
+ cause = (enum gprs_bssgp_cause)*TLVP_VAL(bp->tp, BSSGP_IE_CAUSE);
+
+ if (cause != BSSGP_CAUSE_BVCI_BLOCKED &&
+ cause != BSSGP_CAUSE_UNKNOWN_BVCI)
+ return;
+
+ if (!TLVP_PRESENT(bp->tp, BSSGP_IE_BVCI))
+ return;
+
+ if (gprs_bssgp_pcu_current_bctx()->bvci != bp->bvci) {
+ LOGP(DPCU, LOGL_NOTICE,
+ "Received BSSGP STATUS message for an unknown BVCI (%d), "
+ "ignored\n",
+ bp->bvci);
+ return;
+ }
+
+ switch (cause) {
+ case BSSGP_CAUSE_BVCI_BLOCKED:
+ if (the_pcu->bssgp.bvc_unblocked) {
+ the_pcu->bssgp.bvc_unblocked = 0;
+ bvc_timeout(NULL);
+ }
+ break;
+
+ case BSSGP_CAUSE_UNKNOWN_BVCI:
+ if (the_pcu->bssgp.bvc_reset) {
+ the_pcu->bssgp.bvc_reset = 0;
+ bvc_timeout(NULL);
+ }
+ break;
+ default:
+ break;
+ }
+}
+
+int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx)
+{
+ struct osmo_bssgp_prim *bp;
+ bp = container_of(oph, struct osmo_bssgp_prim, oph);
+
+ switch (oph->sap) {
+ case SAP_BSSGP_NM:
+ if (oph->primitive == PRIM_NM_STATUS)
+ handle_nm_status(bp);
+ break;
+ default:
+ break;
+ }
+ return 0;
+}
+
+void gprs_ns_prim_status_cb(struct osmo_gprs_ns2_prim *nsp)
+{
+ switch (nsp->u.status.cause) {
+ case NS_AFF_CAUSE_SNS_CONFIGURED:
+ LOGP(DPCU, LOGL_NOTICE, "NS-NSE %d SNS configured.\n", nsp->nsei);
+ break;
+ case NS_AFF_CAUSE_RECOVERY:
+ LOGP(DPCU, LOGL_NOTICE, "NS-NSE %d became available\n", nsp->nsei);
+ if (!the_pcu->bssgp.nsvc_unblocked) {
+ the_pcu->bssgp.bvc_sig_reset = 0;
+ the_pcu->bssgp.bvc_reset = 0;
+ the_pcu->bssgp.nsvc_unblocked = 1;
+ bvc_timeout(NULL);
+ }
+ break;
+ case NS_AFF_CAUSE_FAILURE:
+ LOGP(DPCU, LOGL_NOTICE, "NS-NSE %d became unavailable\n", nsp->nsei);
+ if (the_pcu->bssgp.nsvc_unblocked) {
+ the_pcu->bssgp.nsvc_unblocked = 0;
+ osmo_timer_del(&the_pcu->bssgp.bvc_timer);
+ the_pcu->bssgp.bvc_sig_reset = 0;
+ the_pcu->bssgp.bvc_reset = 0;
+ the_pcu->bssgp.bvc_unblocked = 0;
+ }
+ break;
+ case NS_AFF_CAUSE_SNS_FAILURE:
+ break;
+ default:
+ LOGP(DPCU, LOGL_DEBUG,
+ "NS: %s Unknown affecting cause %s / %d from NS\n",
+ get_value_string(osmo_prim_op_names, nsp->oph.operation),
+ gprs_ns2_aff_cause_prim_str(nsp->u.status.cause), nsp->u.status.cause);
+ break;
+ }
+}
+
+/* called by the ns layer */
+int gprs_ns_prim_cb(struct osmo_prim_hdr *oph, void *ctx)
+{
+ struct osmo_gprs_ns2_prim *nsp;
+ int rc = 0;
+
+ if (oph->sap != SAP_NS)
+ return 0;
+
+ nsp = container_of(oph, struct osmo_gprs_ns2_prim, oph);
+
+ if (oph->operation != PRIM_OP_INDICATION) {
+ LOGP(DPCU, LOGL_NOTICE, "NS: %s Unknown prim %d from NS\n",
+ get_value_string(osmo_prim_op_names, oph->operation),
+ oph->operation);
+ goto out;
+ }
+
+ switch (oph->primitive) {
+ case PRIM_NS_UNIT_DATA:
+ /* hand the message into the BSSGP implementation */
+ /* add required msg fields for Gb layer */
+ msgb_bssgph(oph->msg) = oph->msg->l3h;
+ msgb_bvci(oph->msg) = nsp->bvci;
+ msgb_nsei(oph->msg) = nsp->nsei;
+ rc = gprs_bssgp_pcu_rcvmsg(oph->msg);
+ break;
+ case PRIM_NS_STATUS:
+ gprs_ns_prim_status_cb(nsp);
+ break;
+ case PRIM_NS_CONGESTION:
+ break;
+ default:
+ LOGP(DPCU, LOGL_DEBUG,
+ "NS: %s Unknown prim %s / %d from NS\n",
+ get_value_string(osmo_prim_op_names, oph->operation),
+ gprs_ns2_prim_str((enum gprs_ns2_prim) oph->primitive), oph->primitive);
+ break;
+ }
+
+out:
+ if (oph->msg)
+ msgb_free(oph->msg);
+
+ return rc;
+}
+
+/* called by the bssgp layer to send NS PDUs */
+int gprs_gp_send_cb(void *ctx, struct msgb *msg)
+{
+ struct gprs_ns2_inst *nsi = (struct gprs_ns2_inst *) ctx;
+ struct osmo_gprs_ns2_prim nsp = {};
+ nsp.nsei = msgb_nsei(msg);
+ nsp.bvci = msgb_bvci(msg);
+ osmo_prim_init(&nsp.oph, SAP_NS, PRIM_NS_UNIT_DATA,
+ PRIM_OP_REQUEST, msg);
+ return gprs_ns2_recv_prim(nsi, &nsp.oph);
+}
+
+static unsigned count_pdch(const struct gprs_rlcmac_bts *bts)
+{
+ size_t trx_no, ts_no;
+ unsigned num_pdch = 0;
+
+ for (trx_no = 0; trx_no < ARRAY_SIZE(bts->trx); ++trx_no) {
+ const struct gprs_rlcmac_trx *trx = &bts->trx[trx_no];
+
+ for (ts_no = 0; ts_no < ARRAY_SIZE(trx->pdch); ++ts_no) {
+ const struct gprs_rlcmac_pdch *pdch = &trx->pdch[ts_no];
+
+ if (pdch->m_is_enabled)
+ num_pdch += 1;
+ }
+ }
+
+ return num_pdch;
+}
+
+static uint32_t gprs_bssgp_max_leak_rate(enum CodingScheme cs, int num_pdch)
+{
+ int bytes_per_rlc_block = mcs_max_data_block_bytes(cs) * num_data_blocks(mcs_header_type(cs));
+
+ /* n byte payload per 20ms */
+ return bytes_per_rlc_block * (1000 / 20) * num_pdch;
+}
+
+static uint32_t compute_bucket_size(struct gprs_rlcmac_bts *bts,
+ uint32_t leak_rate, uint32_t fallback)
+{
+ uint32_t bucket_size = 0;
+ uint16_t bucket_time = the_pcu->vty.fc_bucket_time;
+
+ if (bucket_time == 0)
+ bucket_time = the_pcu->vty.force_llc_lifetime;
+
+ if (bucket_time == 0xffff)
+ bucket_size = FC_MAX_BUCKET_SIZE;
+
+ if (bucket_size == 0 && bucket_time && leak_rate)
+ bucket_size = (uint64_t)leak_rate * bucket_time / 100;
+
+ if (bucket_size == 0 && leak_rate)
+ bucket_size = leak_rate * FC_DEFAULT_LIFE_TIME_SECS;
+
+ if (bucket_size == 0)
+ bucket_size = fallback;
+
+ if (bucket_size > FC_MAX_BUCKET_SIZE)
+ bucket_size = FC_MAX_BUCKET_SIZE;
+
+ return bucket_size;
+}
+
+static uint32_t get_and_reset_avg_queue_delay(void)
+{
+ struct timespec *delay_sum = &the_pcu->bssgp.queue_delay_sum;
+ uint32_t delay_sum_ms = delay_sum->tv_sec * 1000 +
+ delay_sum->tv_nsec / 1000000000;
+ uint32_t avg_delay_ms = 0;
+
+ if (the_pcu->bssgp.queue_delay_count > 0)
+ avg_delay_ms = delay_sum_ms / the_pcu->bssgp.queue_delay_count;
+
+ /* Reset accumulator */
+ delay_sum->tv_sec = delay_sum->tv_nsec = 0;
+ the_pcu->bssgp.queue_delay_count = 0;
+
+ return avg_delay_ms;
+}
+
+static int get_and_reset_measured_leak_rate(int *usage_by_1000, unsigned num_pdch)
+{
+ int rate; /* byte per second */
+
+ if (the_pcu->bssgp.queue_frames_sent == 0)
+ return -1;
+
+ if (the_pcu->bssgp.queue_frames_recv == 0)
+ return -1;
+
+ *usage_by_1000 = the_pcu->bssgp.queue_frames_recv * 1000 /
+ the_pcu->bssgp.queue_frames_sent;
+
+ /* 20ms/num_pdch is the average RLC block duration, so the rate is
+ * calculated as:
+ * rate = bytes_recv / (block_dur * block_count) */
+ rate = the_pcu->bssgp.queue_bytes_recv * 1000 * num_pdch /
+ (20 * the_pcu->bssgp.queue_frames_recv);
+
+ the_pcu->bssgp.queue_frames_sent = 0;
+ the_pcu->bssgp.queue_bytes_recv = 0;
+ the_pcu->bssgp.queue_frames_recv = 0;
+
+ return rate;
+}
+
+static enum CodingScheme max_coding_scheme_dl(struct gprs_rlcmac_bts *bts)
+{
+ int num = 0;
+ int i;
+ bool mcs_any = false;
+
+ /* First check if we support any MCS: */
+ for (i = 8; i >= 0; i--) {
+ if (bts->mcs_mask & (1 << i)) {
+ num = i + 1;
+ mcs_any = true;
+ break;
+ }
+ }
+
+ if (mcs_any) {
+ if (!the_pcu->vty.cs_adj_enabled) {
+ if (bts->initial_mcs_dl) {
+ num = bts->initial_mcs_dl;
+ } else {
+ /* We found "num" for free in the loop above */
+ }
+ } else if (bts_max_mcs_dl(bts)) {
+ num = bts_max_mcs_dl(bts);
+ } else {
+ num = 9;
+ }
+
+ if (num)
+ return mcs_get_egprs_by_num(num);
+ }
+
+ if (!the_pcu->vty.cs_adj_enabled) {
+ if (bts->initial_cs_dl) {
+ num = bts->initial_cs_dl;
+ } else {
+ for (i = 3; i >= 0; i--) {
+ if (bts->cs_mask & (1 << i)) {
+ num = i + 1;
+ break;
+ }
+ }
+ }
+ } else if (bts_max_cs_dl(bts)) {
+ num = bts_max_cs_dl(bts);
+ }
+
+ if (!num)
+ num = 4;
+
+ return mcs_get_gprs_by_num(num);
+}
+
+static int gprs_bssgp_tx_fc_bvc(void)
+{
+ struct gprs_rlcmac_bts *bts;
+ uint32_t bucket_size; /* oct */
+ uint32_t ms_bucket_size; /* oct */
+ uint32_t leak_rate; /* oct/s */
+ uint32_t ms_leak_rate; /* oct/s */
+ uint32_t avg_delay_ms;
+ int num_pdch = -1;
+ enum CodingScheme max_cs_dl;
+
+ if (!the_pcu->bssgp.bctx) {
+ LOGP(DBSSGP, LOGL_ERROR, "No bctx\n");
+ return -EIO;
+ }
+ bts = the_pcu->bts;
+
+ max_cs_dl = max_coding_scheme_dl(bts);
+
+ bucket_size = the_pcu->vty.fc_bvc_bucket_size;
+ leak_rate = the_pcu->vty.fc_bvc_leak_rate;
+ ms_bucket_size = the_pcu->vty.fc_ms_bucket_size;
+ ms_leak_rate = the_pcu->vty.fc_ms_leak_rate;
+
+ /* FIXME: This calculation is mostly wrong. It should be done based on
+ currently established TBF (and whether the related (egprs)_ms_class
+ as per which CS/MCS they support). */
+ if (leak_rate == 0) {
+ int meas_rate;
+ int usage; /* in 0..1000 */
+
+ if (num_pdch < 0)
+ num_pdch = count_pdch(bts);
+
+ meas_rate = get_and_reset_measured_leak_rate(&usage, num_pdch);
+ if (meas_rate > 0) {
+ leak_rate = gprs_bssgp_max_leak_rate(max_cs_dl, num_pdch);
+ leak_rate =
+ (meas_rate * usage + leak_rate * (1000 - usage)) /
+ 1000;
+ LOGP(DBSSGP, LOGL_DEBUG,
+ "Estimated BVC leak rate = %d "
+ "(measured %d, usage %d%%)\n",
+ leak_rate, meas_rate, usage/10);
+ }
+ }
+
+ if (leak_rate == 0) {
+ if (num_pdch < 0)
+ num_pdch = count_pdch(bts);
+
+ leak_rate = gprs_bssgp_max_leak_rate(max_cs_dl, num_pdch);
+
+ LOGP(DBSSGP, LOGL_DEBUG,
+ "Computed BVC leak rate = %d, num_pdch = %d, cs = %s\n",
+ leak_rate, num_pdch, mcs_name(max_cs_dl));
+ };
+
+ if (ms_leak_rate == 0) {
+ int ms_num_pdch;
+ int max_pdch = gprs_alloc_max_dl_slots_per_ms(bts, 0);
+
+ if (num_pdch < 0)
+ num_pdch = count_pdch(bts);
+
+ ms_num_pdch = num_pdch;
+ if (max_pdch > FC_MS_MAX_RX_SLOTS)
+ max_pdch = FC_MS_MAX_RX_SLOTS;
+ if (ms_num_pdch > max_pdch)
+ ms_num_pdch = max_pdch;
+
+ ms_leak_rate = gprs_bssgp_max_leak_rate(max_cs_dl, ms_num_pdch);
+
+ /* TODO: To properly support multiple TRX, the per MS leak rate
+ * should be derived from the max number of PDCH TS per TRX.
+ */
+ LOGP(DBSSGP, LOGL_DEBUG,
+ "Computed MS default leak rate = %d, ms_num_pdch = %d, "
+ "cs = %s\n",
+ ms_leak_rate, ms_num_pdch, mcs_name(max_cs_dl));
+ };
+
+ /* TODO: Force leak_rate to 0 on buffer bloat */
+
+ if (bucket_size == 0)
+ bucket_size = compute_bucket_size(bts, leak_rate,
+ FC_FALLBACK_BVC_BUCKET_SIZE);
+
+ if (ms_bucket_size == 0)
+ ms_bucket_size = compute_bucket_size(bts, ms_leak_rate,
+ FC_MS_BUCKET_SIZE_BY_BMAX(bucket_size));
+
+ if (leak_rate > FC_MAX_BUCKET_LEAK_RATE)
+ leak_rate = FC_MAX_BUCKET_LEAK_RATE;
+
+ if (ms_leak_rate > FC_MAX_BUCKET_LEAK_RATE)
+ ms_leak_rate = FC_MAX_BUCKET_LEAK_RATE;
+
+ /* Avg queue delay monitoring */
+ avg_delay_ms = get_and_reset_avg_queue_delay();
+
+ /* Update tag */
+ the_pcu->bssgp.fc_tag += 1;
+
+ LOGP(DBSSGP, LOGL_DEBUG,
+ "Sending FLOW CONTROL BVC, Bmax = %d, R = %d, Bmax_MS = %d, "
+ "R_MS = %d, avg_dly = %d\n",
+ bucket_size, leak_rate, ms_bucket_size, ms_leak_rate,
+ avg_delay_ms);
+
+ return bssgp_tx_fc_bvc(the_pcu->bssgp.bctx, the_pcu->bssgp.fc_tag,
+ bucket_size, leak_rate,
+ ms_bucket_size, ms_leak_rate,
+ NULL, &avg_delay_ms);
+}
+
+static void bvc_timeout(void *_priv)
+{
+ unsigned long secs;
+ if (!the_pcu->bssgp.bvc_sig_reset) {
+ LOGP(DBSSGP, LOGL_INFO, "Sending reset on BVCI 0\n");
+ bssgp_tx_bvc_reset(the_pcu->bssgp.bctx, 0, BSSGP_CAUSE_OML_INTERV);
+ secs = osmo_tdef_get(the_pcu->T_defs, 2, OSMO_TDEF_S, -1);
+ osmo_timer_schedule(&the_pcu->bssgp.bvc_timer, secs, 0);
+ return;
+ }
+
+ if (!the_pcu->bssgp.bvc_reset) {
+ LOGP(DBSSGP, LOGL_INFO, "Sending reset on BVCI %d\n",
+ the_pcu->bssgp.bctx->bvci);
+ bssgp_tx_bvc_reset(the_pcu->bssgp.bctx, the_pcu->bssgp.bctx->bvci, BSSGP_CAUSE_OML_INTERV);
+ secs = osmo_tdef_get(the_pcu->T_defs, 2, OSMO_TDEF_S, -1);
+ osmo_timer_schedule(&the_pcu->bssgp.bvc_timer, secs, 0);
+ return;
+ }
+
+ if (!the_pcu->bssgp.bvc_unblocked) {
+ LOGP(DBSSGP, LOGL_INFO, "Sending unblock on BVCI %d\n",
+ the_pcu->bssgp.bctx->bvci);
+ bssgp_tx_bvc_unblock(the_pcu->bssgp.bctx);
+ secs = osmo_tdef_get(the_pcu->T_defs, 1, OSMO_TDEF_S, -1);
+ osmo_timer_schedule(&the_pcu->bssgp.bvc_timer, secs, 0);
+ return;
+ }
+
+ LOGP(DBSSGP, LOGL_DEBUG, "Sending flow control info on BVCI %d\n",
+ the_pcu->bssgp.bctx->bvci);
+ gprs_bssgp_tx_fc_bvc();
+ osmo_timer_schedule(&the_pcu->bssgp.bvc_timer, the_pcu->vty.fc_interval, 0);
+}
+
+static int ns_create_nsvc(struct gprs_rlcmac_bts *bts,
+ uint16_t nsei,
+ const struct osmo_sockaddr *local,
+ const struct osmo_sockaddr *remote,
+ const uint16_t *nsvci,
+ uint16_t valid)
+{
+ int i, rc;
+ uint16_t binds = 0;
+ bool nsvcs = false;
+ struct gprs_ns2_vc *nsvc;
+ struct gprs_ns2_vc_bind *bind[PCU_IF_NUM_NSVC] = { };
+ char name[5];
+
+ if (!valid)
+ return -1;
+
+ for (i = 0; i < PCU_IF_NUM_NSVC; i++) {
+ if (!(valid & (1 << i)))
+ continue;
+
+ if (!gprs_ns2_ip_bind_by_sockaddr(the_pcu->nsi, &local[i])) {
+ snprintf(name, sizeof(name), "pcu%d", i);
+ rc = gprs_ns2_ip_bind(the_pcu->nsi, name, &local[i], 0, &bind[i]);
+ if (rc < 0) {
+ LOGP(DBSSGP, LOGL_ERROR, "Failed to bind to %s\n", osmo_sockaddr_to_str(&local[i]));
+ continue;
+ }
+ }
+
+ binds |= 1 << i;
+ }
+
+ if (!binds) {
+ LOGP(DBSSGP, LOGL_ERROR, "Failed to bind to any NS-VC\n");
+ return -1;
+ }
+
+ bts->nse = gprs_ns2_nse_by_nsei(the_pcu->nsi, nsei);
+ if (!bts->nse)
+ bts->nse = gprs_ns2_create_nse(the_pcu->nsi, nsei,
+ GPRS_NS2_LL_UDP, the_pcu->vty.ns_dialect);
+
+ if (!bts->nse) {
+ LOGP(DBSSGP, LOGL_ERROR, "Failed to create NSE\n");
+ gprs_ns2_free_binds(the_pcu->nsi);
+ return 1;
+ }
+
+ for (i = 0; i < PCU_IF_NUM_NSVC; i++) {
+ if (!(binds & (1 << i)))
+ continue;
+
+ /* FIXME: for SNS we just use the first successful NS-VC instead of all for the initial connect */
+ if (the_pcu->vty.ns_dialect == NS2_DIALECT_SNS) {
+ rc = gprs_ns2_sns_add_endpoint(bts->nse, &remote[i]);
+ if (!rc)
+ return rc;
+ else
+ LOGP(DBSSGP, LOGL_ERROR, "Failed to connect to (SNS) towards SGSN %s!\n", osmo_sockaddr_to_str(&remote[i]));
+ } else {
+ nsvc = gprs_ns2_ip_connect(bind[i], &remote[i], bts->nse, nsvci[i]);
+ if (nsvc)
+ nsvcs = true;
+ else
+ LOGP(DBSSGP, LOGL_ERROR, "Failed to connect to towards SGSN %s!\n", osmo_sockaddr_to_str(&remote[i]));
+ }
+ }
+
+ return nsvcs ? 0 : -1;
+}
+
+struct nsvc_cb {
+ const struct osmo_sockaddr *local;
+ const struct osmo_sockaddr *remote;
+ const uint16_t *nsvci;
+ /* [in] bitmask of valid nsvc in local/remote */
+ uint16_t valid;
+ /* [out] bitmask of found nsvcs */
+ uint16_t found;
+};
+
+static int ns_conf_vc_cb(struct gprs_ns2_vc *nsvc, void *ctx)
+{
+ struct nsvc_cb *data = (struct nsvc_cb *) ctx;
+ unsigned int i;
+
+ for (i = 0; i < PCU_IF_NUM_NSVC; i++) {
+ if (!(data->valid & (1 << i)))
+ continue;
+ if (data->found & (1 << i))
+ continue;
+
+ if (gprs_ns2_ip_vc_equal(nsvc, &data->local[i],
+ &data->remote[i],
+ data->nsvci[i])) {
+ data->found |= 1 << i;
+ return 0;
+ }
+ }
+
+ /* Found an extra nsvc */
+ LOGP(DBSSGP, LOGL_DEBUG, " Removing NSVC %s\n", gprs_ns2_ll_str(nsvc));
+ gprs_ns2_free_nsvc(nsvc);
+
+ return 0;
+}
+
+int gprs_ns_config(struct gprs_rlcmac_bts *bts, uint16_t nsei,
+ const struct osmo_sockaddr *local,
+ const struct osmo_sockaddr *remote,
+ uint16_t *nsvci, uint16_t valid)
+{
+ int rc = 0;
+ if (!bts->nse) {
+ /* there shouldn't any previous state. */
+ gprs_ns2_free_nses(the_pcu->nsi);
+ gprs_ns2_free_binds(the_pcu->nsi);
+ rc = ns_create_nsvc(bts, nsei, local, remote, nsvci, valid);
+ } else if (nsei != gprs_ns2_nse_nsei(bts->nse)) {
+ /* the NSEI has changed */
+ gprs_ns2_free_nses(the_pcu->nsi);
+ gprs_ns2_free_binds(the_pcu->nsi);
+ rc = ns_create_nsvc(bts, nsei, local, remote, nsvci, valid);
+ } else if (the_pcu->vty.ns_dialect == NS2_DIALECT_SNS) {
+ /* SNS: check if the initial nsvc is the same, if not recreate it */
+ const struct osmo_sockaddr *initial = gprs_ns2_nse_sns_remote(bts->nse);
+ unsigned int i;
+ for (i = 0; i < PCU_IF_NUM_NSVC; i++) {
+ if (!(valid & (1 << i)))
+ continue;
+
+ /* found the initial - everything should be fine */
+ if (!osmo_sockaddr_cmp(initial, &remote[i]))
+ return 0;
+ }
+
+ gprs_ns2_free_nses(the_pcu->nsi);
+ gprs_ns2_free_binds(the_pcu->nsi);
+ rc = ns_create_nsvc(bts, nsei, local, remote, nsvci, valid);
+ } else {
+ /* check if all NSVC are still the same. */
+ struct nsvc_cb data = {
+ .local = &local[0],
+ .remote = &remote[0],
+ .nsvci = &nsvci[0],
+ .valid = valid,
+ .found = 0,
+ };
+
+ /* search the current active nsvcs */
+ gprs_ns2_nse_foreach_nsvc(bts->nse, &ns_conf_vc_cb, &data);
+
+ /* we found all our valid nsvcs and might have removed all other nsvcs */
+ if (valid == data.found)
+ return 0;
+
+ /* remove all found nsvcs from the valid field */
+ valid &= ~data.found;
+ rc = ns_create_nsvc(bts, nsei, local, remote, nsvci, valid);
+ }
+
+ if (rc)
+ LOGP(DBSSGP, LOGL_ERROR, "Failed to connect!\n");
+
+ return rc;
+}
+
+struct gprs_bssgp_pcu *gprs_bssgp_init(
+ struct gprs_rlcmac_bts *bts,
+ uint16_t nsei, uint16_t bvci,
+ uint16_t mcc, uint16_t mnc, bool mnc_3_digits,
+ uint16_t lac, uint16_t rac, uint16_t cell_id)
+{
+
+ /* if already created... return the current address */
+ if (the_pcu->bssgp.bctx)
+ return &the_pcu->bssgp;
+
+ the_pcu->bssgp.bts = bts;
+ the_pcu->bssgp.bctx = btsctx_alloc(bvci, nsei);
+ if (!the_pcu->bssgp.bctx) {
+ LOGP(DBSSGP, LOGL_ERROR, "Failed to create BSSGP context\n");
+ the_pcu->bssgp.bts->nse = NULL;
+ return NULL;
+ }
+ the_pcu->bssgp.bctx->ra_id.mcc = spoof_mcc ? : mcc;
+ if (spoof_mnc) {
+ the_pcu->bssgp.bctx->ra_id.mnc = spoof_mnc;
+ the_pcu->bssgp.bctx->ra_id.mnc_3_digits = spoof_mnc_3_digits;
+ } else {
+ the_pcu->bssgp.bctx->ra_id.mnc = mnc;
+ the_pcu->bssgp.bctx->ra_id.mnc_3_digits = mnc_3_digits;
+ }
+ the_pcu->bssgp.bctx->ra_id.lac = lac;
+ the_pcu->bssgp.bctx->ra_id.rac = rac;
+ the_pcu->bssgp.bctx->cell_id = cell_id;
+
+ osmo_timer_setup(&the_pcu->bssgp.bvc_timer, bvc_timeout, bts);
+
+ return &the_pcu->bssgp;
+}
+
+void gprs_bssgp_destroy(struct gprs_rlcmac_bts *bts)
+{
+ osmo_timer_del(&the_pcu->bssgp.bvc_timer);
+
+ /* FIXME: blocking... */
+ the_pcu->bssgp.nsvc_unblocked = 0;
+ the_pcu->bssgp.bvc_sig_reset = 0;
+ the_pcu->bssgp.bvc_reset = 0;
+ the_pcu->bssgp.bvc_unblocked = 0;
+
+ bssgp_bvc_ctx_free(the_pcu->bssgp.bctx);
+ the_pcu->bssgp.bctx = NULL;
+
+ gprs_ns2_free(the_pcu->nsi);
+ the_pcu->nsi = NULL;
+ bts->nse = NULL;
+}
+
+struct bssgp_bvc_ctx *gprs_bssgp_pcu_current_bctx(void)
+{
+ return the_pcu->bssgp.bctx;
+}
+
+void gprs_bssgp_update_frames_sent()
+{
+ the_pcu->bssgp.queue_frames_sent += 1;
+}
+
+void gprs_bssgp_update_bytes_received(unsigned bytes_recv, unsigned frames_recv)
+{
+ the_pcu->bssgp.queue_bytes_recv += bytes_recv;
+ the_pcu->bssgp.queue_frames_recv += frames_recv;
+}
+
+void gprs_bssgp_update_queue_delay(const struct timespec *tv_recv,
+ const struct timespec *tv_now)
+{
+ struct timespec *delay_sum = &the_pcu->bssgp.queue_delay_sum;
+ struct timespec tv_delay;
+
+ timespecsub(tv_now, tv_recv, &tv_delay);
+ timespecadd(delay_sum, &tv_delay, delay_sum);
+
+ the_pcu->bssgp.queue_delay_count += 1;
+}