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osmo-pcu/src/gprs_bssgp_pcu.c

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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.
*/
#include <gprs_rlcmac.h>
#include <gprs_bssgp_pcu.h>
#include <gprs_bssgp_rim.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/core/stats.h>
#include <osmocom/gsm/gsm48.h>
#include "coding_scheme.h"
#include "tbf_dl.h"
#include "llc.h"
#include "gprs_rlcmac.h"
#include "bts_pch_timer.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 const struct rate_ctr_desc sgsn_ctr_description[] = {
[SGSN_CTR_RX_PAGING_CS] = { "rx_paging_cs", "Amount of paging CS requests received" },
[SGSN_CTR_RX_PAGING_PS] = { "rx_paging_ps", "Amount of paging PS requests received" },
};
static const struct rate_ctr_group_desc sgsn_ctrg_desc = {
.group_name_prefix = "pcu:sgsn",
.group_description = "SGSN Statistics",
.class_id = OSMO_STATS_CLASS_SUBSCRIBER,
.num_ctr = ARRAY_SIZE(sgsn_ctr_description),
.ctr_desc = sgsn_ctr_description,
};
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;
const char *imsi = NULL;
struct osmo_mobile_identity mi_imsi;
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);
}
imsi = &mi_imsi.imsi[0];
}
/* 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, imsi ? : "none", len);
return dl_tbf_handle(the_pcu->bssgp.bts, tlli, tlli_old, imsi, ms_class,
egprs_ms_class, delay_csec, data, len);
}
/* 3GPP TS 48.018 Table 10.3.2. Returns 0 on success, suggested BSSGP cause otherwise */
static unsigned int get_paging_cs_mi(struct paging_req_cs *req, const struct tlv_parsed *tp)
{
int rc;
req->chan_needed = tlvp_val8(tp, BSSGP_IE_CHAN_NEEDED, 0);
if (!TLVP_PRESENT(tp, BSSGP_IE_IMSI)) {
LOGP(DBSSGP, LOGL_ERROR, "IMSI Mobile Identity mandatory IE not found\n");
return BSSGP_CAUSE_MISSING_MAND_IE;
}
rc = osmo_mobile_identity_decode(&req->mi_imsi, TLVP_VAL(tp, BSSGP_IE_IMSI),
TLVP_LEN(tp, BSSGP_IE_IMSI), true);
if (rc < 0 || req->mi_imsi.type != GSM_MI_TYPE_IMSI) {
LOGP(DBSSGP, LOGL_ERROR, "Invalid IMSI Mobile Identity\n");
return BSSGP_CAUSE_INV_MAND_INF;
}
req->mi_imsi_present = true;
/* TMSI is optional */
req->mi_tmsi_present = false;
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 */
req->mi_tmsi = (struct osmo_mobile_identity){
.type = GSM_MI_TYPE_TMSI,
};
req->mi_tmsi.tmsi = osmo_load32be(TLVP_VAL(tp, BSSGP_IE_TMSI));
req->mi_tmsi_present = true;
}
if (TLVP_PRESENT(tp, BSSGP_IE_TLLI))
req->tlli = osmo_load32be(TLVP_VAL(tp, BSSGP_IE_TLLI));
else
req->tlli = GSM_RESERVED_TMSI;
return 0;
}
static int gprs_bssgp_pcu_rx_paging_cs(struct msgb *msg, const struct tlv_parsed *tp)
{
struct paging_req_cs req;
struct gprs_rlcmac_bts *bts;
struct GprsMs *ms;
int rc;
rate_ctr_inc(rate_ctr_group_get_ctr(the_pcu->bssgp.ctrs, SGSN_CTR_RX_PAGING_CS));
if ((rc = get_paging_cs_mi(&req, tp)) > 0)
return bssgp_tx_status((enum gprs_bssgp_cause) rc, NULL, msg);
/* We need to page all BTSs since even if a BTS has a matching MS, it
* may have already moved to a newer BTS. On Each BTS, if the MS is
* known, then bts_add_paging() can optimize and page only on PDCHs the
* target MS is using. */
llist_for_each_entry(bts, &the_pcu->bts_list, list) {
/* TODO: Match by TMSI before IMSI if present?! */
ms = bts_ms_by_tlli(bts, req.tlli, req.tlli);
if (!ms && req.mi_imsi_present)
ms = bts_ms_by_imsi(bts, req.mi_imsi.imsi);
bts_add_paging(bts, &req, ms);
}
return 0;
}
/* Returns 0 on success, suggested BSSGP cause otherwise */
static unsigned int get_paging_ps_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_ps(struct msgb *msg, const struct tlv_parsed *tp)
{
struct osmo_mobile_identity mi_imsi;
struct osmo_mobile_identity paging_mi;
struct gprs_rlcmac_bts *bts;
uint16_t pgroup;
int rc;
rate_ctr_inc(rate_ctr_group_get_ctr(the_pcu->bssgp.ctrs, SGSN_CTR_RX_PAGING_PS));
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_ps_mi(&paging_mi, tp)) > 0)
return bssgp_tx_status((enum gprs_bssgp_cause) rc, NULL, msg);
/* FIXME: look if MS is attached a specific BTS and then only page on that one? */
llist_for_each_entry(bts, &the_pcu->bts_list, list) {
if (bts_pch_timer_get_by_imsi(bts, mi_imsi.imsi)) {
LOGP(DBSSGP, LOGL_INFO, "PS-Paging request already pending for IMSI=%s\n", mi_imsi.imsi);
bts_do_rate_ctr_inc(bts, CTR_PCH_REQUESTS_ALREADY);
continue;
}
if (gprs_rlcmac_paging_request(bts, &paging_mi, pgroup) < 0)
continue;
bts_pch_timer_start(bts, &paging_mi, mi_imsi.imsi);
}
return 0;
}
/* 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;
uint16_t ns_bvci = msgb_bvci(msg), nsei = msgb_nsei(msg);
uint16_t bvci;
int data_len;
int rc = 0;
struct bssgp_bvc_ctx *bctx;
switch (pdu_type) {
case BSSGP_PDUT_STATUS:
/* Pass the message to the generic BSSGP parser, which handles
* STATUS and RESET messages in either direction. */
case BSSGP_PDUT_RAN_INFO:
case BSSGP_PDUT_RAN_INFO_REQ:
case BSSGP_PDUT_RAN_INFO_ACK:
case BSSGP_PDUT_RAN_INFO_ERROR:
case BSSGP_PDUT_RAN_INFO_APP_ERROR:
/* Also pass all RIM related messages to the generic BSSGP
* parser so that it can deliver primitive to the RIM SAP
* (SAP_BSSGP_RIM) */
return bssgp_rcvmsg(msg);
default:
break;
}
/* 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) {
if (ns_bvci != BVCI_SIGNALLING || !TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) {
LOGP(DBSSGP, LOGL_ERROR, "Rx an invalid BVC-RESET %s\n", msgb_hexdump(msg));
return bssgp_tx_status(BSSGP_CAUSE_INV_MAND_INF, NULL, msg);
}
bvci = tlvp_val16be(&tp, BSSGP_IE_BVCI);
if (bvci != BVCI_SIGNALLING && bvci != the_pcu->bssgp.bctx->bvci) {
LOGP(DBSSGP, LOGL_ERROR, "Rx BVC-RESET for an unknown BVCI %d\n", bvci);
return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, &bvci, msg);
}
return bssgp_rcvmsg(msg);
}
/* 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(rate_ctr_group_get_ctr(bctx->ctrg, BSSGP_CTR_PKTS_IN));
rate_ctr_add(rate_ctr_group_get_ctr(bctx->ctrg, 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 (the_pcu->bssgp.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;
int rc;
enum gprs_bssgp_cause cause;
bp = container_of(oph, struct osmo_bssgp_prim, oph);
switch (oph->sap) {
case SAP_BSSGP_NM:
switch (oph->primitive) {
case PRIM_NM_STATUS:
handle_nm_status(bp);
break;
case PRIM_NM_BVC_RESET:
/* received a BVC PTP reset */
LOGP(DPCU, LOGL_INFO, "Rx BVC_RESET on bvci %d\n", bp->bvci);
/* Rx Reset from SGSN */
if (bp->bvci == BVCI_SIGNALLING) {
if (TLVP_PRES_LEN(bp->tp, BSSGP_IE_CAUSE, 1))
cause = (enum gprs_bssgp_cause)*TLVP_VAL(bp->tp, BSSGP_IE_CAUSE);
else {
LOGP(DBSSGP, LOGL_ERROR, "NSEI=%u BVC RESET without cause?!\n", bp->nsei);
break;
}
rc = bssgp_tx_bvc_ptp_reset(bp->nsei, cause);
if (rc < 0) {
LOGP(DBSSGP, LOGL_ERROR, "NSEI=%u BVC PTP reset procedure failed: %d\n", bp->nsei, rc);
break;
}
the_pcu->bssgp.bvc_sig_reset = 1;
the_pcu->bssgp.bvc_reset = 0;
the_pcu->bssgp.bvc_unblocked = 0;
} else if (bp->bvci == the_pcu->bssgp.bctx->bvci) {
the_pcu->bssgp.bvc_reset = 1;
the_pcu->bssgp.bvc_unblocked = 0;
bvc_timeout(NULL);
}
break;
}
break;
case SAP_BSSGP_RIM:
return handle_rim(bp);
default:
break;
}
return 0;
}
void gprs_ns_prim_status_cb(struct osmo_gprs_ns2_prim *nsp)
{
switch (nsp->u.status.cause) {
case GPRS_NS2_AFF_CAUSE_SNS_CONFIGURED:
LOGP(DPCU, LOGL_NOTICE, "NS-NSE %d SNS configured.\n", nsp->nsei);
break;
case GPRS_NS2_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 GPRS_NS2_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 GPRS_NS2_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 GPRS_NS2_PRIM_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 GPRS_NS2_PRIM_STATUS:
gprs_ns_prim_status_cb(nsp);
break;
case GPRS_NS2_PRIM_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, GPRS_NS2_PRIM_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_is_enabled(pdch))
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;
}
/* FIXME: This calculation needs to be redone to support multiple BTS */
bts = llist_first_entry_or_null(&the_pcu->bts_list, struct gprs_rlcmac_bts, list);
if (!bts) {
LOGP(DBSSGP, LOGL_ERROR, "No bts\n");
return -EIO;
}
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, -102, 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, -102, 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, -101, 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);
}
/*! configure NS layer
*
* \param bts pointer to the bts object
* \param nsei the NSEI of the BSS
* \param local pointer to an array of local address to bind on.
* \param remote pointer to an array of remote address SGSNs. If dynamic IP-SNS is used remote is used as initial SGSN endpoints.
* \param nsvci pointer to an array of nsvcis
* \param valid bitmask. a 1 means the position in the array contains a valid entry for local, remote, nsvci
* \returns 0 if the configuration has succeeded. on error != 0
*/
static int ns_configure_nse(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)
{
unsigned int i;
int 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[16];
bool sns_configured = false;
if (!valid)
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");
return -1;
}
for (i = 0; i < PCU_IF_NUM_NSVC; i++) {
if (!(valid & (1 << i)))
continue;
bind[i] = gprs_ns2_ip_bind_by_sockaddr(the_pcu->nsi, &local[i]);
if (!bind[i]) {
snprintf(name, sizeof(name), "pcu%u", 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;
}
if (the_pcu->vty.ns_dialect == GPRS_NS2_DIALECT_SNS) {
rc = gprs_ns2_sns_add_bind(bts->nse, bind[i]);
if (rc < 0) {
LOGP(DBSSGP, LOGL_ERROR, "Failed to add bind %s to the NSE for IP-SNS\n", osmo_sockaddr_to_str(&local[i]));
continue;
}
}
if (the_pcu->vty.ns_ip_dscp != -1)
gprs_ns2_ip_bind_set_dscp(bind[i], the_pcu->vty.ns_ip_dscp);
if (the_pcu->vty.ns_priority != -1)
gprs_ns2_ip_bind_set_priority(bind[i], the_pcu->vty.ns_priority);
}
binds |= 1 << i;
}
if (!binds) {
LOGP(DBSSGP, LOGL_ERROR, "Failed to bind to any NS-VC\n");
gprs_ns2_free_nses(the_pcu->nsi);
return -1;
}
for (i = 0; i < PCU_IF_NUM_NSVC; i++) {
if (!(binds & (1 << i)))
continue;
if (the_pcu->vty.ns_dialect == GPRS_NS2_DIALECT_SNS) {
rc = gprs_ns2_sns_add_endpoint(bts->nse, &remote[i]);
if (rc && rc != -EALREADY) {
LOGP(DBSSGP, LOGL_ERROR, "Failed to add SNS endpoint %s!\n", osmo_sockaddr_to_str(&remote[i]));
return rc;
} else {
sns_configured = true;
}
} 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]));
}
}
if (the_pcu->vty.ns_dialect == GPRS_NS2_DIALECT_SNS)
return sns_configured ? 0 : -1;
else
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;
}
/* update the ns configuration if needed */
int gprs_ns_update_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_configure_nse(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_configure_nse(bts, nsei, local, remote, nsvci, valid);
} else if (the_pcu->vty.ns_dialect == GPRS_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_configure_nse(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_configure_nse(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->is_sgsn = false;
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);
the_pcu->bssgp.ctrs = rate_ctr_group_alloc(the_pcu, &sgsn_ctrg_desc, 0);
OSMO_ASSERT(the_pcu->bssgp.ctrs)
return &the_pcu->bssgp;
}
void gprs_bssgp_destroy(struct gprs_rlcmac_bts *bts)
{
rate_ctr_group_free(the_pcu->bssgp.ctrs);
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;
}
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;
}
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