1359 lines
39 KiB
C
1359 lines
39 KiB
C
/* gprs_bssgp_pcu.cpp
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*
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* Copyright (C) 2012 Ivan Klyuchnikov
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* Copyright (C) 2013 by Holger Hans Peter Freyther
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <gprs_rlcmac.h>
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#include <gprs_bssgp_pcu.h>
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#include <gprs_bssgp_rim.h>
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#include <pcu_l1_if.h>
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#include <gprs_debug.h>
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#include <bts.h>
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#include <tbf.h>
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#include <coding_scheme.h>
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#include <pdch.h>
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#include <decoding.h>
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#include <osmocom/gprs/gprs_ns2.h>
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#include <osmocom/gsm/protocol/gsm_23_003.h>
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#include <osmocom/gprs/protocol/gsm_08_16.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/stats.h>
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#include <osmocom/gsm/gsm48.h>
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#include "coding_scheme.h"
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#include "tbf_dl.h"
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#include "llc.h"
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#include "gprs_rlcmac.h"
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#include "bts_pch_timer.h"
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/* Tuning parameters for BSSGP flow control */
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#define FC_DEFAULT_LIFE_TIME_SECS 10 /* experimental value, 10s */
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#define FC_MS_BUCKET_SIZE_BY_BMAX(bmax) ((bmax) / 2 + 500) /* experimental */
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#define FC_FALLBACK_BVC_BUCKET_SIZE 2000 /* e.g. on R = 0, value taken from PCAP files */
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#define FC_MS_MAX_RX_SLOTS 4 /* limit MS default R to 4 TS per MS */
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/* Constants for BSSGP flow control */
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#define FC_MAX_BUCKET_LEAK_RATE (6553500 / 8) /* Byte/s */
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#define FC_MAX_BUCKET_SIZE 6553500 /* Octets */
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extern void *tall_pcu_ctx;
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extern uint16_t spoof_mcc, spoof_mnc;
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extern bool spoof_mnc_3_digits;
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static const struct rate_ctr_desc sgsn_ctr_description[] = {
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[SGSN_CTR_RX_PAGING_CS] = { "rx_paging_cs", "Amount of paging CS requests received" },
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[SGSN_CTR_RX_PAGING_PS] = { "rx_paging_ps", "Amount of paging PS requests received" },
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};
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static const struct rate_ctr_group_desc sgsn_ctrg_desc = {
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.group_name_prefix = "pcu:sgsn",
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.group_description = "SGSN Statistics",
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.class_id = OSMO_STATS_CLASS_SUBSCRIBER,
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.num_ctr = ARRAY_SIZE(sgsn_ctr_description),
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.ctr_desc = sgsn_ctr_description,
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};
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static void bvc_timeout(void *_priv);
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static int parse_ra_cap(struct tlv_parsed *tp, MS_Radio_Access_capability_t *rac)
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{
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struct bitvec *block;
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uint8_t cap_len;
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uint8_t *cap;
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memset(rac, 0, sizeof(*rac));
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if (!TLVP_PRESENT(tp, BSSGP_IE_MS_RADIO_ACCESS_CAP))
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return -EINVAL;
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cap_len = TLVP_LEN(tp, BSSGP_IE_MS_RADIO_ACCESS_CAP);
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cap = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_MS_RADIO_ACCESS_CAP);
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LOGP(DBSSGP, LOGL_DEBUG, "Got BSSGP RA Capability of size %d\n", cap_len);
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block = bitvec_alloc(cap_len, tall_pcu_ctx);
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bitvec_unpack(block, cap);
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/* TS 24.008, 10.5.5.12a */
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decode_gsm_ra_cap(block, rac);
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bitvec_free(block);
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return 0;
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}
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static int gprs_bssgp_pcu_rx_dl_ud(struct msgb *msg, struct tlv_parsed *tp)
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{
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struct bssgp_ud_hdr *budh;
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uint32_t tlli;
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uint32_t tlli_old = GSM_RESERVED_TMSI;
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uint8_t *data;
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uint16_t len;
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uint8_t ms_class = 0;
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uint8_t egprs_ms_class = 0;
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int rc;
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MS_Radio_Access_capability_t rac;
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const char *imsi = NULL;
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struct osmo_mobile_identity mi_imsi;
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budh = (struct bssgp_ud_hdr *)msgb_bssgph(msg);
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tlli = ntohl(budh->tlli);
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/* LLC_PDU is mandatory IE */
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if (!TLVP_PRESENT(tp, BSSGP_IE_LLC_PDU))
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{
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LOGP(DBSSGP, LOGL_NOTICE, "BSSGP TLLI=0x%08x Rx UL-UD missing mandatory IE\n", tlli);
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return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg);
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}
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data = (uint8_t *) TLVP_VAL(tp, BSSGP_IE_LLC_PDU);
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len = TLVP_LEN(tp, BSSGP_IE_LLC_PDU);
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if (len > LLC_MAX_LEN)
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{
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LOGP(DBSSGP, LOGL_NOTICE, "BSSGP TLLI=0x%08x Rx UL-UD IE_LLC_PDU too large\n", tlli);
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return bssgp_tx_status(BSSGP_CAUSE_COND_IE_ERR, NULL, msg);
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}
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/* read IMSI. if no IMSI exists, use first paging block (any paging),
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* because during attachment the IMSI might not be known, so the MS
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* will listen to all paging blocks. */
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if (TLVP_PRESENT(tp, BSSGP_IE_IMSI))
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{
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rc = osmo_mobile_identity_decode(&mi_imsi, TLVP_VAL(tp, BSSGP_IE_IMSI), TLVP_LEN(tp, BSSGP_IE_IMSI),
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true);
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if (rc < 0 || mi_imsi.type != GSM_MI_TYPE_IMSI) {
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LOGP(DBSSGP, LOGL_NOTICE, "Failed to parse IMSI IE (rc=%d)\n", rc);
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return bssgp_tx_status(BSSGP_CAUSE_COND_IE_ERR, NULL, msg);
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}
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imsi = &mi_imsi.imsi[0];
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}
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/* parse ms radio access capability */
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if (parse_ra_cap(tp, &rac) >= 0) {
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/* Get the EGPRS class from the RA capability */
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ms_class = get_ms_class_by_capability(&rac);
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egprs_ms_class = get_egprs_ms_class_by_capability(&rac);
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LOGP(DBSSGP, LOGL_DEBUG, "Got downlink MS class %d/%d\n",
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ms_class, egprs_ms_class);
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}
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/* get lifetime */
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uint16_t delay_csec = 0xffff;
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if (TLVP_PRESENT(tp, BSSGP_IE_PDU_LIFETIME))
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{
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uint8_t lt_len = TLVP_LEN(tp, BSSGP_IE_PDU_LIFETIME);
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if (lt_len == 2)
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delay_csec = tlvp_val16be(tp, BSSGP_IE_PDU_LIFETIME);
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else
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LOGP(DBSSGP, LOGL_NOTICE, "BSSGP invalid length of "
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"PDU_LIFETIME IE\n");
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} else
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LOGP(DBSSGP, LOGL_NOTICE, "BSSGP missing mandatory "
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"PDU_LIFETIME IE\n");
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/* get optional TLLI old */
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if (TLVP_PRESENT(tp, BSSGP_IE_TLLI))
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{
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uint8_t tlli_len = TLVP_LEN(tp, BSSGP_IE_PDU_LIFETIME);
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if (tlli_len == 2)
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tlli_old = tlvp_val16be(tp, BSSGP_IE_TLLI);
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else
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LOGP(DBSSGP, LOGL_NOTICE, "BSSGP invalid length of "
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"TLLI (old) IE\n");
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}
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LOGP(DBSSGP, LOGL_INFO, "LLC [SGSN -> PCU] = TLLI: 0x%08x IMSI: %s len: %d\n",
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tlli, imsi ? : "none", len);
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return dl_tbf_handle(the_pcu->bssgp.bts, tlli, tlli_old, imsi, ms_class,
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egprs_ms_class, delay_csec, data, len);
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}
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/* 3GPP TS 48.018 Table 10.3.2. Returns 0 on success, suggested BSSGP cause otherwise */
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static unsigned int get_paging_cs_mi(struct paging_req_cs *req, const struct tlv_parsed *tp)
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{
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int rc;
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req->chan_needed = tlvp_val8(tp, BSSGP_IE_CHAN_NEEDED, 0);
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if (!TLVP_PRESENT(tp, BSSGP_IE_IMSI)) {
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LOGP(DBSSGP, LOGL_ERROR, "IMSI Mobile Identity mandatory IE not found\n");
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return BSSGP_CAUSE_MISSING_MAND_IE;
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}
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rc = osmo_mobile_identity_decode(&req->mi_imsi, TLVP_VAL(tp, BSSGP_IE_IMSI),
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TLVP_LEN(tp, BSSGP_IE_IMSI), true);
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if (rc < 0 || req->mi_imsi.type != GSM_MI_TYPE_IMSI) {
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LOGP(DBSSGP, LOGL_ERROR, "Invalid IMSI Mobile Identity\n");
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return BSSGP_CAUSE_INV_MAND_INF;
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}
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req->mi_imsi_present = true;
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/* TMSI is optional */
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req->mi_tmsi_present = false;
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if (TLVP_PRESENT(tp, BSSGP_IE_TMSI)) {
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/* Be safe against an evil SGSN - check the length */
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if (TLVP_LEN(tp, BSSGP_IE_TMSI) != GSM23003_TMSI_NUM_BYTES) {
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LOGP(DBSSGP, LOGL_NOTICE, "TMSI IE has odd length (!= 4)\n");
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return BSSGP_CAUSE_COND_IE_ERR;
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}
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/* NOTE: TMSI (unlike IMSI) IE comes without MI type header */
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req->mi_tmsi = (struct osmo_mobile_identity){
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.type = GSM_MI_TYPE_TMSI,
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};
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req->mi_tmsi.tmsi = osmo_load32be(TLVP_VAL(tp, BSSGP_IE_TMSI));
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req->mi_tmsi_present = true;
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}
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if (TLVP_PRESENT(tp, BSSGP_IE_TLLI))
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req->tlli = osmo_load32be(TLVP_VAL(tp, BSSGP_IE_TLLI));
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else
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req->tlli = GSM_RESERVED_TMSI;
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return 0;
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}
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static int gprs_bssgp_pcu_rx_paging_cs(struct msgb *msg, const struct tlv_parsed *tp)
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{
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struct paging_req_cs req;
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struct gprs_rlcmac_bts *bts;
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struct GprsMs *ms;
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int rc;
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rate_ctr_inc(rate_ctr_group_get_ctr(the_pcu->bssgp.ctrs, SGSN_CTR_RX_PAGING_CS));
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if ((rc = get_paging_cs_mi(&req, tp)) > 0)
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return bssgp_tx_status((enum gprs_bssgp_cause) rc, NULL, msg);
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/* We need to page all BTSs since even if a BTS has a matching MS, it
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* may have already moved to a newer BTS. On Each BTS, if the MS is
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* known, then bts_add_paging() can optimize and page only on PDCHs the
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* target MS is using. */
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llist_for_each_entry(bts, &the_pcu->bts_list, list) {
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/* TODO: Match by TMSI before IMSI if present?! */
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ms = bts_ms_by_tlli(bts, req.tlli, req.tlli);
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if (!ms && req.mi_imsi_present)
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ms = bts_ms_by_imsi(bts, req.mi_imsi.imsi);
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bts_add_paging(bts, &req, ms);
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}
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return 0;
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}
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/* Returns 0 on success, suggested BSSGP cause otherwise */
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static unsigned int get_paging_ps_mi(struct osmo_mobile_identity *mi, const struct tlv_parsed *tp)
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{
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/* Use TMSI (if present) or IMSI */
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if (TLVP_PRESENT(tp, BSSGP_IE_TMSI)) {
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/* Be safe against an evil SGSN - check the length */
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if (TLVP_LEN(tp, BSSGP_IE_TMSI) != GSM23003_TMSI_NUM_BYTES) {
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LOGP(DBSSGP, LOGL_NOTICE, "TMSI IE has odd length (!= 4)\n");
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return BSSGP_CAUSE_COND_IE_ERR;
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}
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/* NOTE: TMSI (unlike IMSI) IE comes without MI type header */
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*mi = (struct osmo_mobile_identity){
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.type = GSM_MI_TYPE_TMSI,
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};
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mi->tmsi = osmo_load32be(TLVP_VAL(tp, BSSGP_IE_TMSI));
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} else if (TLVP_PRESENT(tp, BSSGP_IE_IMSI)) {
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int rc = osmo_mobile_identity_decode(mi, TLVP_VAL(tp, BSSGP_IE_IMSI), TLVP_LEN(tp, BSSGP_IE_IMSI),
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true);
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if (rc < 0 || mi->type != GSM_MI_TYPE_IMSI) {
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LOGP(DBSSGP, LOGL_ERROR, "Invalid IMSI Mobile Identity\n");
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return BSSGP_CAUSE_COND_IE_ERR;
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}
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} else {
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LOGP(DBSSGP, LOGL_ERROR, "Neither TMSI IE nor IMSI IE is present\n");
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return BSSGP_CAUSE_MISSING_COND_IE;
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}
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return 0;
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}
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static int gprs_bssgp_pcu_rx_paging_ps(struct msgb *msg, const struct tlv_parsed *tp)
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{
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struct osmo_mobile_identity mi_imsi;
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struct osmo_mobile_identity paging_mi;
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struct gprs_rlcmac_bts *bts;
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uint16_t pgroup;
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int rc;
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rate_ctr_inc(rate_ctr_group_get_ctr(the_pcu->bssgp.ctrs, SGSN_CTR_RX_PAGING_PS));
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if (!TLVP_PRESENT(tp, BSSGP_IE_IMSI)) {
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LOGP(DBSSGP, LOGL_ERROR, "No IMSI\n");
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return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg);
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}
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rc = osmo_mobile_identity_decode(&mi_imsi, TLVP_VAL(tp, BSSGP_IE_IMSI), TLVP_LEN(tp, BSSGP_IE_IMSI), true);
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if (rc < 0 || mi_imsi.type != GSM_MI_TYPE_IMSI) {
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LOGP(DBSSGP, LOGL_NOTICE, "Failed to parse IMSI IE (rc=%d)\n", rc);
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return bssgp_tx_status(BSSGP_CAUSE_INV_MAND_INF, NULL, msg);
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}
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pgroup = imsi2paging_group(mi_imsi.imsi);
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if (pgroup > 999) {
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LOGP(DBSSGP, LOGL_NOTICE, "Failed to compute IMSI %s paging group\n", mi_imsi.imsi);
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return bssgp_tx_status(BSSGP_CAUSE_INV_MAND_INF, NULL, msg);
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}
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if ((rc = get_paging_ps_mi(&paging_mi, tp)) > 0)
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return bssgp_tx_status((enum gprs_bssgp_cause) rc, NULL, msg);
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/* FIXME: look if MS is attached a specific BTS and then only page on that one? */
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llist_for_each_entry(bts, &the_pcu->bts_list, list) {
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if (bts_pch_timer_get_by_imsi(bts, mi_imsi.imsi)) {
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LOGP(DBSSGP, LOGL_INFO, "PS-Paging request already pending for IMSI=%s\n", mi_imsi.imsi);
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bts_do_rate_ctr_inc(bts, CTR_PCH_REQUESTS_ALREADY);
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continue;
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}
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if (gprs_rlcmac_paging_request(bts, &paging_mi, pgroup) < 0)
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continue;
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bts_pch_timer_start(bts, &paging_mi, mi_imsi.imsi);
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}
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return 0;
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}
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/* Receive a BSSGP PDU from a BSS on a PTP BVCI */
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static int gprs_bssgp_pcu_rx_ptp(struct msgb *msg, struct tlv_parsed *tp, struct bssgp_bvc_ctx *bctx)
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{
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struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg);
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enum bssgp_pdu_type pdu_type = (enum bssgp_pdu_type) bgph->pdu_type;
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int bvci = bctx ? bctx->bvci : -1;
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unsigned rc = 0;
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if (!bctx)
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return -EINVAL;
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/* If traffic is received on a BVC that is marked as blocked, the
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* received PDU shall not be accepted and a STATUS PDU (Cause value:
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* BVC Blocked) shall be sent to the peer entity on the signalling BVC */
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if (bctx->state & BVC_S_BLOCKED && pdu_type != BSSGP_PDUT_STATUS)
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{
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uint16_t bvci = msgb_bvci(msg);
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LOGP(DBSSGP, LOGL_NOTICE, "rx BVC_S_BLOCKED\n");
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return bssgp_tx_status(BSSGP_CAUSE_BVCI_BLOCKED, &bvci, msg);
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}
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switch (pdu_type) {
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case BSSGP_PDUT_STATUS:
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/* already handled in libosmogb */
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OSMO_ASSERT(0);
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break;
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case BSSGP_PDUT_DL_UNITDATA:
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LOGP(DBSSGP, LOGL_DEBUG, "Rx BSSGP BVCI=%d (PTP) DL_UNITDATA\n", bvci);
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if (the_pcu->bssgp.on_dl_unit_data)
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the_pcu->bssgp.on_dl_unit_data(&the_pcu->bssgp, msg, tp);
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gprs_bssgp_pcu_rx_dl_ud(msg, tp);
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break;
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case BSSGP_PDUT_FLOW_CONTROL_BVC_ACK:
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case BSSGP_PDUT_FLOW_CONTROL_MS_ACK:
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LOGP(DBSSGP, LOGL_DEBUG, "Rx BSSGP BVCI=%d (PTP) %s\n",
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bvci, bssgp_pdu_str(pdu_type));
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break;
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case BSSGP_PDUT_PAGING_CS:
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gprs_bssgp_pcu_rx_paging_cs(msg, tp);
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break;
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case BSSGP_PDUT_PAGING_PS:
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gprs_bssgp_pcu_rx_paging_ps(msg, tp);
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break;
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case BSSGP_PDUT_RA_CAPABILITY:
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case BSSGP_PDUT_RA_CAPA_UPDATE_ACK:
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LOGP(DBSSGP, LOGL_INFO, "Rx BSSGP BVCI=%d (PTP) PDU type %s not implemented\n",
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bvci, bssgp_pdu_str(pdu_type));
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break;
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/* See TS 08.18 5.4.1 */
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case BSSGP_PDUT_SUSPEND:
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case BSSGP_PDUT_SUSPEND_ACK:
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case BSSGP_PDUT_SUSPEND_NACK:
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case BSSGP_PDUT_RESUME:
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case BSSGP_PDUT_RESUME_ACK:
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case BSSGP_PDUT_RESUME_NACK:
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case BSSGP_PDUT_FLUSH_LL:
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case BSSGP_PDUT_FLUSH_LL_ACK:
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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;
|
|
}
|