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osmo-pcu/src/gprs_bssgp_pcu.cpp

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/* 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 <gprs_coding_scheme.h>
#include <pdch.h>
extern "C" {
#include <osmocom/gsm/protocol/gsm_23_003.h>
#include <osmocom/core/utils.h>
#include "coding_scheme.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 */
static struct gprs_bssgp_pcu the_pcu = { 0, };
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 gprs_ns_reconnect(struct gprs_nsvc *nsvc);
#if 0
static int parse_ra_cap(struct tlv_parsed *tp, MS_Radio_Access_capability_t *rac)
{
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;
}
#endif
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 = 0;
uint8_t *data;
uint16_t len;
char imsi[OSMO_IMSI_BUF_SIZE] = "000";
uint8_t ms_class = 0;
uint8_t egprs_ms_class = 0;
int rc;
#if 0
MS_Radio_Access_capability_t rac;
#endif
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))
{
/* gsm48_mi_to_string() returns number of bytes written, including '\0' */
rc = gsm48_mi_to_string(imsi, sizeof(imsi), TLVP_VAL(tp, BSSGP_IE_IMSI),
TLVP_LEN(tp, BSSGP_IE_IMSI));
if (rc != GSM23003_IMSI_MAX_DIGITS + 1) {
LOGP(DBSSGP, LOGL_NOTICE, "Failed to parse IMSI IE (rc=%d)\n", rc);
return bssgp_tx_status(BSSGP_CAUSE_COND_IE_ERR, NULL, msg);
}
}
#if 0 /* Do not rely on this IE. TODO: make this configurable */
/* parse ms radio access capability */
if (parse_ra_cap(tp, &rac) >= 0) {
/* Get the EGPRS class from the RA capability */
ms_class = Decoding::get_ms_class_by_capability(&rac);
egprs_ms_class =
Decoding::get_egprs_ms_class_by_capability(&rac);
LOGP(DBSSGP, LOGL_DEBUG, "Got downlink MS class %d/%d\n",
ms_class, egprs_ms_class);
}
#endif
/* 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, imsi, len);
return gprs_rlcmac_dl_tbf::handle(the_pcu.bts, tlli, tlli_old, imsi,
ms_class, egprs_ms_class, delay_csec, data, len);
}
static int gprs_bssgp_pcu_rx_paging_cs(struct msgb *msg, struct tlv_parsed *tp)
{
const uint8_t *mi;
uint8_t mi_len;
uint8_t *chan_needed = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_CHAN_NEEDED);
if (TLVP_PRESENT(tp, BSSGP_IE_TMSI)) {
mi_len = TLVP_LEN(tp, BSSGP_IE_TMSI);
mi = TLVP_VAL(tp, BSSGP_IE_TMSI);
} else if (TLVP_PRESENT(tp, BSSGP_IE_IMSI)) { /* Use IMSI if TMSI not available: */
mi_len = TLVP_LEN(tp, BSSGP_IE_IMSI);
mi = TLVP_VAL(tp, BSSGP_IE_IMSI);
} else {
LOGP(DBSSGP, LOGL_ERROR, "Neither TMSI IE nor IMSI IE is present\n");
return bssgp_tx_status(BSSGP_CAUSE_COND_IE_ERR, NULL, msg);
}
return BTS::main_bts()->add_paging(chan_needed ? *chan_needed : 0, mi, mi_len);
}
static int gprs_bssgp_pcu_rx_paging_ps(struct msgb *msg, struct tlv_parsed *tp)
{
char imsi[16];
uint16_t pgroup;
const uint8_t *mi;
uint8_t mi_len;
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);
}
/* gsm48_mi_to_string() returns number of bytes written, including '\0' */
rc = gsm48_mi_to_string(imsi, sizeof(imsi), TLVP_VAL(tp, BSSGP_IE_IMSI),
TLVP_LEN(tp, BSSGP_IE_IMSI));
if (rc != GSM23003_IMSI_MAX_DIGITS + 1) {
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(imsi);
if (pgroup > 999) {
LOGP(DBSSGP, LOGL_NOTICE, "Failed to compute IMSI %s paging group\n", imsi);
return bssgp_tx_status(BSSGP_CAUSE_INV_MAND_INF, NULL, msg);
}
if (TLVP_PRESENT(tp, BSSGP_IE_TMSI)) {
mi_len = TLVP_LEN(tp, BSSGP_IE_TMSI);
mi = TLVP_VAL(tp, BSSGP_IE_TMSI);
} else { /* Use IMSI if TMSI not available: */
mi_len = TLVP_LEN(tp, BSSGP_IE_IMSI);
mi = TLVP_VAL(tp, BSSGP_IE_IMSI);
}
return gprs_rlcmac_paging_request(mi, mi_len, 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.on_dl_unit_data)
the_pcu.on_dl_unit_data(&the_pcu, 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.bvc_sig_reset)
the_pcu.bvc_sig_reset = 1;
else
the_pcu.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.bvc_unblocked = 1;
if (the_pcu.on_unblock_ack)
the_pcu.on_unblock_ack(&the_pcu);
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.bvc_unblocked) {
the_pcu.bvc_unblocked = 0;
bvc_timeout(NULL);
}
break;
case BSSGP_CAUSE_UNKNOWN_BVCI:
if (the_pcu.bvc_reset) {
the_pcu.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;
}
int gprs_bssgp_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc, struct msgb *msg, uint16_t bvci)
{
int rc = 0;
switch (event) {
case GPRS_NS_EVT_UNIT_DATA:
/* hand the message into the BSSGP implementation */
rc = gprs_bssgp_pcu_rcvmsg(msg);
break;
default:
LOGP(DPCU, LOGL_NOTICE, "RLCMAC: Unknown event %u from NS\n", event);
rc = -EIO;
break;
}
return rc;
}
static int nsvc_signal_cb(unsigned int subsys, unsigned int signal,
void *handler_data, void *signal_data)
{
struct ns_signal_data *nssd;
if (subsys != SS_L_NS)
return -EINVAL;
nssd = (struct ns_signal_data *)signal_data;
if (signal != S_SNS_CONFIGURED && nssd->nsvc != the_pcu.nsvc) {
LOGP(DPCU, LOGL_ERROR, "Signal received of unknown NSVC\n");
return -EINVAL;
}
switch (signal) {
case S_SNS_CONFIGURED:
the_pcu.bvc_sig_reset = 0;
the_pcu.bvc_reset = 0;
/* There's no NS-RESET / NS-UNBLOCK procedure on IP SNS based NS-VCs */
the_pcu.nsvc_unblocked = 1;
LOGP(DPCU, LOGL_NOTICE, "NS-VC %d is unblocked.\n", the_pcu.nsvc->nsvci);
bvc_timeout(NULL);
break;
case S_NS_UNBLOCK:
if (!the_pcu.nsvc_unblocked) {
the_pcu.nsvc_unblocked = 1;
LOGP(DPCU, LOGL_NOTICE, "NS-VC %d is unblocked.\n",
the_pcu.nsvc->nsvci);
the_pcu.bvc_sig_reset = 0;
the_pcu.bvc_reset = 0;
the_pcu.bvc_unblocked = 0;
bvc_timeout(NULL);
}
break;
case S_NS_BLOCK:
if (the_pcu.nsvc_unblocked) {
the_pcu.nsvc_unblocked = 0;
osmo_timer_del(&the_pcu.bvc_timer);
the_pcu.bvc_sig_reset = 0;
the_pcu.bvc_reset = 0;
the_pcu.bvc_unblocked = 0;
LOGP(DPCU, LOGL_NOTICE, "NS-VC is blocked.\n");
}
break;
case S_NS_ALIVE_EXP:
LOGP(DPCU, LOGL_NOTICE, "Tns alive expired too often, "
"re-starting RESET procedure\n");
gprs_ns_reconnect(nssd->nsvc);
break;
}
return 0;
}
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->is_enabled())
num_pdch += 1;
}
}
return num_pdch;
}
static uint32_t gprs_bssgp_max_leak_rate(GprsCodingScheme cs, int num_pdch)
{
int bytes_per_rlc_block = cs.maxDataBlockBytes() * num_data_blocks(cs.headerTypeData());
/* 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 = bts->fc_bucket_time;
if (bucket_time == 0)
bucket_time = bts->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.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.queue_delay_count > 0)
avg_delay_ms = delay_sum_ms / the_pcu.queue_delay_count;
/* Reset accumulator */
delay_sum->tv_sec = delay_sum->tv_nsec = 0;
the_pcu.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.queue_frames_sent == 0)
return -1;
if (the_pcu.queue_frames_recv == 0)
return -1;
*usage_by_1000 = the_pcu.queue_frames_recv * 1000 /
the_pcu.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.queue_bytes_recv * 1000 * num_pdch /
(20 * the_pcu.queue_frames_recv);
the_pcu.queue_frames_sent = 0;
the_pcu.queue_bytes_recv = 0;
the_pcu.queue_frames_recv = 0;
return rate;
}
static GprsCodingScheme max_coding_scheme_dl(struct gprs_rlcmac_bts *bts)
{
int num;
if (bts->egprs_enabled) {
if (!bts->cs_adj_enabled) {
if (bts->initial_mcs_dl)
num = bts->initial_mcs_dl;
else
num = 1;
} else if (bts->max_mcs_dl) {
num = bts->max_mcs_dl;
} else {
num = 9;
}
return GprsCodingScheme::getEgprsByNum(num);
}
if (!bts->cs_adj_enabled) {
if (bts->initial_cs_dl)
num = bts->initial_cs_dl;
else if (bts->cs4)
num = 4;
else if (bts->cs3)
num = 3;
else if (bts->cs2)
num = 2;
else
num = 1;
} else if (bts->max_cs_dl) {
num = bts->max_cs_dl;
} else {
num = 4;
}
return GprsCodingScheme::getGprsByNum(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;
GprsCodingScheme max_cs_dl;
if (!the_pcu.bctx) {
LOGP(DBSSGP, LOGL_ERROR, "No bctx\n");
return -EIO;
}
bts = bts_main_data();
max_cs_dl = max_coding_scheme_dl(bts);
bucket_size = bts->fc_bvc_bucket_size;
leak_rate = bts->fc_bvc_leak_rate;
ms_bucket_size = bts->fc_ms_bucket_size;
ms_leak_rate = bts->fc_ms_leak_rate;
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);
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.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.bctx, the_pcu.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.bvc_sig_reset) {
LOGP(DBSSGP, LOGL_INFO, "Sending reset on BVCI 0\n");
bssgp_tx_bvc_reset(the_pcu.bctx, 0, BSSGP_CAUSE_OML_INTERV);
secs = osmo_tdef_get(the_pcu.bts->T_defs_pcu, 2, OSMO_TDEF_S, -1);
osmo_timer_schedule(&the_pcu.bvc_timer, secs, 0);
return;
}
if (!the_pcu.bvc_reset) {
LOGP(DBSSGP, LOGL_INFO, "Sending reset on BVCI %d\n",
the_pcu.bctx->bvci);
bssgp_tx_bvc_reset(the_pcu.bctx, the_pcu.bctx->bvci, BSSGP_CAUSE_OML_INTERV);
secs = osmo_tdef_get(the_pcu.bts->T_defs_pcu, 2, OSMO_TDEF_S, -1);
osmo_timer_schedule(&the_pcu.bvc_timer, secs, 0);
return;
}
if (!the_pcu.bvc_unblocked) {
LOGP(DBSSGP, LOGL_INFO, "Sending unblock on BVCI %d\n",
the_pcu.bctx->bvci);
bssgp_tx_bvc_unblock(the_pcu.bctx);
secs = osmo_tdef_get(the_pcu.bts->T_defs_pcu, 1, OSMO_TDEF_S, -1);
osmo_timer_schedule(&the_pcu.bvc_timer, secs, 0);
return;
}
LOGP(DBSSGP, LOGL_DEBUG, "Sending flow control info on BVCI %d\n",
the_pcu.bctx->bvci);
gprs_bssgp_tx_fc_bvc();
osmo_timer_schedule(&the_pcu.bvc_timer, the_pcu.bts->fc_interval, 0);
}
static int gprs_ns_reconnect(struct gprs_nsvc *nsvc)
{
struct gprs_nsvc *nsvc2;
if (nsvc != the_pcu.nsvc) {
LOGP(DBSSGP, LOGL_ERROR, "NSVC is invalid\n");
return -EBADF;
}
if (the_pcu.bts->gb_dialect_sns)
nsvc2 = gprs_ns_nsip_connect_sns(bssgp_nsi, &nsvc->ip.bts_addr, nsvc->nsei, nsvc->nsvci);
else
nsvc2 = gprs_ns_nsip_connect(bssgp_nsi, &nsvc->ip.bts_addr, nsvc->nsei, nsvc->nsvci);
if (!nsvc2) {
LOGP(DBSSGP, LOGL_ERROR, "Failed to reconnect NSVC\n");
return -EIO;
}
return 0;
}
/* create BSSGP/NS layer instances */
struct gprs_bssgp_pcu *gprs_bssgp_create_and_connect(struct gprs_rlcmac_bts *bts,
uint16_t local_port, uint32_t sgsn_ip,
uint16_t sgsn_port, uint16_t nsei, uint16_t nsvci, uint16_t bvci,
uint16_t mcc, uint16_t mnc, bool mnc_3_digits, uint16_t lac, uint16_t rac,
uint16_t cell_id)
{
struct sockaddr_in dest;
int rc;
/* if already created... return the current address */
if (the_pcu.bctx)
return &the_pcu;
the_pcu.bts = bts;
/* don't specify remote IP/port if SNS dialect is in use; Doing so would
* issue a connect() on the socket, which prevents us to dynamically communicate
* with any number of IP-SNS endpoints on the SGSN side */
if (!bts->gb_dialect_sns) {
bssgp_nsi->nsip.remote_port = sgsn_port;
bssgp_nsi->nsip.remote_ip = sgsn_ip;
}
bssgp_nsi->nsip.local_port = local_port;
rc = gprs_ns_nsip_listen(bssgp_nsi);
if (rc < 0) {
LOGP(DBSSGP, LOGL_ERROR, "Failed to create socket\n");
gprs_ns_close(bssgp_nsi);
return NULL;
}
dest.sin_family = AF_INET;
dest.sin_port = htons(sgsn_port);
dest.sin_addr.s_addr = htonl(sgsn_ip);
if (bts->gb_dialect_sns)
the_pcu.nsvc = gprs_ns_nsip_connect_sns(bssgp_nsi, &dest, nsei, nsvci);
else
the_pcu.nsvc = gprs_ns_nsip_connect(bssgp_nsi, &dest, nsei, nsvci);
if (!the_pcu.nsvc) {
LOGP(DBSSGP, LOGL_ERROR, "Failed to create NSVCt\n");
gprs_ns_close(bssgp_nsi);
return NULL;
}
the_pcu.bctx = btsctx_alloc(bvci, nsei);
if (!the_pcu.bctx) {
LOGP(DBSSGP, LOGL_ERROR, "Failed to create BSSGP context\n");
the_pcu.nsvc = NULL;
gprs_ns_close(bssgp_nsi);
return NULL;
}
the_pcu.bctx->ra_id.mcc = spoof_mcc ? : mcc;
if (spoof_mnc) {
the_pcu.bctx->ra_id.mnc = spoof_mnc;
the_pcu.bctx->ra_id.mnc_3_digits = spoof_mnc_3_digits;
} else {
the_pcu.bctx->ra_id.mnc = mnc;
the_pcu.bctx->ra_id.mnc_3_digits = mnc_3_digits;
}
the_pcu.bctx->ra_id.lac = lac;
the_pcu.bctx->ra_id.rac = rac;
the_pcu.bctx->cell_id = cell_id;
osmo_signal_register_handler(SS_L_NS, nsvc_signal_cb, NULL);
osmo_timer_setup(&the_pcu.bvc_timer, bvc_timeout, NULL);
return &the_pcu;
}
void gprs_bssgp_destroy(void)
{
struct gprs_ns_inst *nsi = bssgp_nsi;
if (!nsi)
return;
bssgp_nsi = NULL;
osmo_timer_del(&the_pcu.bvc_timer);
osmo_signal_unregister_handler(SS_L_NS, nsvc_signal_cb, NULL);
the_pcu.nsvc = NULL;
/* FIXME: blocking... */
the_pcu.nsvc_unblocked = 0;
the_pcu.bvc_sig_reset = 0;
the_pcu.bvc_reset = 0;
the_pcu.bvc_unblocked = 0;
gprs_ns_destroy(nsi);
bssgp_bvc_ctx_free(the_pcu.bctx);
the_pcu.bctx = NULL;
}
struct bssgp_bvc_ctx *gprs_bssgp_pcu_current_bctx(void)
{
return the_pcu.bctx;
}
void gprs_bssgp_update_frames_sent()
{
the_pcu.queue_frames_sent += 1;
}
void gprs_bssgp_update_bytes_received(unsigned bytes_recv, unsigned frames_recv)
{
the_pcu.queue_bytes_recv += bytes_recv;
the_pcu.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.queue_delay_sum;
struct timespec tv_delay;
timespecsub(tv_now, tv_recv, &tv_delay);
timespecadd(delay_sum, &tv_delay, delay_sum);
the_pcu.queue_delay_count += 1;
}
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