740 lines
19 KiB
C
740 lines
19 KiB
C
/* pcu_sock.c: Connect from PCU via unix domain socket */
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/* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org>
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* (C) 2009-2012 by Andreas Eversberg <jolly@eversberg.eu>
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* (C) 2012 by Holger Hans Peter Freyther
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/gsm/l1sap.h>
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#include <osmocom/gsm/gsm0502.h>
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#include <osmocom/bsc/gsm_data.h>
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#include <osmocom/bsc/pcu_if.h>
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#include <osmocom/bsc/pcuif_proto.h>
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#include <osmocom/bsc/signal.h>
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#include <osmocom/bsc/debug.h>
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#include <osmocom/bsc/abis_rsl.h>
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static int pcu_sock_send(struct gsm_bts *bts, struct msgb *msg);
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uint32_t trx_get_hlayer1(struct gsm_bts_trx *trx);
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int pcu_direct = 1;
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static const char *sapi_string[] = {
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[PCU_IF_SAPI_RACH] = "RACH",
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[PCU_IF_SAPI_AGCH] = "AGCH",
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[PCU_IF_SAPI_PCH] = "PCH",
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[PCU_IF_SAPI_BCCH] = "BCCH",
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[PCU_IF_SAPI_PDTCH] = "PDTCH",
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[PCU_IF_SAPI_PRACH] = "PRACH",
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[PCU_IF_SAPI_PTCCH] = "PTCCH",
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[PCU_IF_SAPI_AGCH_DT] = "AGCH_DT",
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};
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/* Check if BTS has a PCU connection */
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static bool pcu_connected(struct gsm_bts *bts)
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{
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struct pcu_sock_state *state = bts->pcu_state;
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if (!state)
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return false;
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if (state->conn_bfd.fd <= 0)
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return false;
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return true;
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}
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/*
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* PCU messages
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*/
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/* Set up an message buffer to package an pcu interface message */
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struct msgb *pcu_msgb_alloc(uint8_t msg_type, uint8_t bts_nr)
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{
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struct msgb *msg;
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struct gsm_pcu_if *pcu_prim;
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msg = msgb_alloc(sizeof(struct gsm_pcu_if), "pcu_sock_tx");
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if (!msg)
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return NULL;
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msgb_put(msg, sizeof(struct gsm_pcu_if));
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pcu_prim = (struct gsm_pcu_if *) msg->data;
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pcu_prim->msg_type = msg_type;
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pcu_prim->bts_nr = bts_nr;
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return msg;
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}
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/* Helper function exclusivly used by pcu_if_signal_cb() */
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static bool ts_should_be_pdch(struct gsm_bts_trx_ts *ts) {
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if (ts->pchan == GSM_PCHAN_PDCH)
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return true;
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if (ts->pchan == GSM_PCHAN_TCH_F_PDCH) {
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/* When we're busy deactivating the PDCH, we first set
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* DEACT_PENDING, tell the PCU about it and wait for a
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* response. So DEACT_PENDING means "no PDCH" to the PCU.
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* Similarly, when we're activating PDCH, we set the
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* ACT_PENDING and wait for an activation response from the
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* PCU, so ACT_PENDING means "is PDCH". */
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if (ts->flags & TS_F_PDCH_ACTIVE)
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return !(ts->flags & TS_F_PDCH_DEACT_PENDING);
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else
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return (ts->flags & TS_F_PDCH_ACT_PENDING);
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}
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if (ts->pchan == GSM_PCHAN_TCH_F_TCH_H_PDCH) {
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/*
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* When we're busy de-/activating the PDCH, we first set
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* ts->dyn.pchan_want, tell the PCU about it and wait for a
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* response. So only care about dyn.pchan_want here.
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*/
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return ts->dyn.pchan_want == GSM_PCHAN_PDCH;
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}
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return false;
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}
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/* Send BTS properties to the PCU */
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static int pcu_tx_info_ind(struct gsm_bts *bts)
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{
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struct msgb *msg;
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struct gsm_pcu_if *pcu_prim;
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struct gsm_pcu_if_info_ind *info_ind;
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struct gprs_rlc_cfg *rlcc;
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struct gsm_bts_gprs_nsvc *nsvc;
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struct gsm_bts_trx *trx;
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struct gsm_bts_trx_ts *ts;
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int i, j;
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OSMO_ASSERT(bts);
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OSMO_ASSERT(bts->network);
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LOGP(DPCU, LOGL_INFO, "Sending info for BTS %d\n",bts->nr);
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rlcc = &bts->gprs.cell.rlc_cfg;
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msg = pcu_msgb_alloc(PCU_IF_MSG_INFO_IND, bts->nr);
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if (!msg)
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return -ENOMEM;
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pcu_prim = (struct gsm_pcu_if *) msg->data;
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info_ind = &pcu_prim->u.info_ind;
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info_ind->version = PCU_IF_VERSION;
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info_ind->flags |= PCU_IF_FLAG_ACTIVE;
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if (pcu_direct)
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info_ind->flags |= PCU_IF_FLAG_SYSMO;
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/* RAI */
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info_ind->mcc = bts->network->country_code;
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info_ind->mnc = bts->network->network_code;
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info_ind->lac = bts->location_area_code;
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info_ind->rac = bts->gprs.rac;
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/* NSE */
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info_ind->nsei = bts->gprs.nse.nsei;
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memcpy(info_ind->nse_timer, bts->gprs.nse.timer, 7);
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memcpy(info_ind->cell_timer, bts->gprs.cell.timer, 11);
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/* cell attributes */
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info_ind->cell_id = bts->cell_identity;
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info_ind->repeat_time = rlcc->paging.repeat_time;
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info_ind->repeat_count = rlcc->paging.repeat_count;
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info_ind->bvci = bts->gprs.cell.bvci;
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info_ind->t3142 = rlcc->parameter[RLC_T3142];
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info_ind->t3169 = rlcc->parameter[RLC_T3169];
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info_ind->t3191 = rlcc->parameter[RLC_T3191];
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info_ind->t3193_10ms = rlcc->parameter[RLC_T3193];
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info_ind->t3195 = rlcc->parameter[RLC_T3195];
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info_ind->n3101 = rlcc->parameter[RLC_N3101];
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info_ind->n3103 = rlcc->parameter[RLC_N3103];
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info_ind->n3105 = rlcc->parameter[RLC_N3105];
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info_ind->cv_countdown = rlcc->parameter[CV_COUNTDOWN];
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if (rlcc->cs_mask & (1 << GPRS_CS1))
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info_ind->flags |= PCU_IF_FLAG_CS1;
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if (rlcc->cs_mask & (1 << GPRS_CS2))
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info_ind->flags |= PCU_IF_FLAG_CS2;
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if (rlcc->cs_mask & (1 << GPRS_CS3))
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info_ind->flags |= PCU_IF_FLAG_CS3;
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if (rlcc->cs_mask & (1 << GPRS_CS4))
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info_ind->flags |= PCU_IF_FLAG_CS4;
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if (bts->gprs.mode == BTS_GPRS_EGPRS) {
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if (rlcc->cs_mask & (1 << GPRS_MCS1))
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info_ind->flags |= PCU_IF_FLAG_MCS1;
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if (rlcc->cs_mask & (1 << GPRS_MCS2))
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info_ind->flags |= PCU_IF_FLAG_MCS2;
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if (rlcc->cs_mask & (1 << GPRS_MCS3))
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info_ind->flags |= PCU_IF_FLAG_MCS3;
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if (rlcc->cs_mask & (1 << GPRS_MCS4))
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info_ind->flags |= PCU_IF_FLAG_MCS4;
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if (rlcc->cs_mask & (1 << GPRS_MCS5))
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info_ind->flags |= PCU_IF_FLAG_MCS5;
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if (rlcc->cs_mask & (1 << GPRS_MCS6))
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info_ind->flags |= PCU_IF_FLAG_MCS6;
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if (rlcc->cs_mask & (1 << GPRS_MCS7))
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info_ind->flags |= PCU_IF_FLAG_MCS7;
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if (rlcc->cs_mask & (1 << GPRS_MCS8))
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info_ind->flags |= PCU_IF_FLAG_MCS8;
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if (rlcc->cs_mask & (1 << GPRS_MCS9))
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info_ind->flags |= PCU_IF_FLAG_MCS9;
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}
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#warning "isn't dl_tbf_ext wrong?: * 10 and no ntohs"
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info_ind->dl_tbf_ext = rlcc->parameter[T_DL_TBF_EXT];
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#warning "isn't ul_tbf_ext wrong?: * 10 and no ntohs"
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info_ind->ul_tbf_ext = rlcc->parameter[T_UL_TBF_EXT];
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info_ind->initial_cs = rlcc->initial_cs;
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info_ind->initial_mcs = rlcc->initial_mcs;
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/* NSVC */
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for (i = 0; i < ARRAY_SIZE(info_ind->nsvci); i++) {
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nsvc = &bts->gprs.nsvc[i];
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info_ind->nsvci[i] = nsvc->nsvci;
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info_ind->local_port[i] = nsvc->local_port;
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info_ind->remote_port[i] = nsvc->remote_port;
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info_ind->remote_ip[i] = nsvc->remote_ip;
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}
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for (i = 0; i < ARRAY_SIZE(info_ind->trx); i++) {
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trx = gsm_bts_trx_num(bts, i);
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if (!trx)
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continue;
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info_ind->trx[i].hlayer1 = 0x2342;
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info_ind->trx[i].pdch_mask = 0;
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info_ind->trx[i].arfcn = trx->arfcn;
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for (j = 0; j < ARRAY_SIZE(trx->ts); j++) {
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ts = &trx->ts[j];
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if (ts->mo.nm_state.operational == NM_OPSTATE_ENABLED
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&& ts_should_be_pdch(ts)) {
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info_ind->trx[i].pdch_mask |= (1 << j);
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info_ind->trx[i].tsc[j] =
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(ts->tsc >= 0) ? ts->tsc : bts->bsic & 7;
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LOGP(DPCU, LOGL_INFO, "trx=%d ts=%d: "
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"available (tsc=%d arfcn=%d)\n",
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trx->nr, ts->nr,
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info_ind->trx[i].tsc[j],
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info_ind->trx[i].arfcn);
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}
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}
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}
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return pcu_sock_send(bts, msg);
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}
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void pcu_info_update(struct gsm_bts *bts)
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{
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if (pcu_connected(bts))
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pcu_tx_info_ind(bts);
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}
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/* Forward rach indication to PCU */
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int pcu_tx_rach_ind(struct gsm_bts *bts, int16_t qta, uint16_t ra, uint32_t fn,
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uint8_t is_11bit, enum ph_burst_type burst_type)
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{
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struct msgb *msg;
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struct gsm_pcu_if *pcu_prim;
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struct gsm_pcu_if_rach_ind *rach_ind;
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/* Bail if no PCU is connected */
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if (!pcu_connected(bts)) {
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LOGP(DRSL, LOGL_ERROR, "BTS %d CHAN RQD(GPRS) but PCU not "
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"connected!\n", bts->nr);
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return -ENODEV;
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}
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LOGP(DPCU, LOGL_INFO, "Sending RACH indication: qta=%d, ra=%d, "
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"fn=%d\n", qta, ra, fn);
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msg = pcu_msgb_alloc(PCU_IF_MSG_RACH_IND, bts->nr);
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if (!msg)
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return -ENOMEM;
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pcu_prim = (struct gsm_pcu_if *) msg->data;
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rach_ind = &pcu_prim->u.rach_ind;
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rach_ind->sapi = PCU_IF_SAPI_RACH;
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rach_ind->ra = ra;
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rach_ind->qta = qta;
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rach_ind->fn = fn;
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rach_ind->is_11bit = is_11bit;
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rach_ind->burst_type = burst_type;
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return pcu_sock_send(bts, msg);
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}
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/* Confirm the sending of an immediate assignment to the pcu */
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int pcu_tx_imm_ass_sent(struct gsm_bts *bts, uint32_t tlli)
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{
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struct msgb *msg;
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struct gsm_pcu_if *pcu_prim;
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struct gsm_pcu_if_data_cnf_dt *data_cnf_dt;
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LOGP(DPCU, LOGL_INFO, "Sending PCH confirm with direct TLLI\n");
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msg = pcu_msgb_alloc(PCU_IF_MSG_DATA_CNF_DT, bts->nr);
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if (!msg)
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return -ENOMEM;
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pcu_prim = (struct gsm_pcu_if *) msg->data;
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data_cnf_dt = &pcu_prim->u.data_cnf_dt;
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data_cnf_dt->sapi = PCU_IF_SAPI_PCH;
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data_cnf_dt->tlli = tlli;
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return pcu_sock_send(bts, msg);
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}
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/* we need to decode the raw RR paging messsage (see PCU code
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* Encoding::write_paging_request) and extract the mobile identity
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* (P-TMSI) from it */
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static int pcu_rx_rr_paging(struct gsm_bts *bts, uint8_t paging_group,
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const uint8_t *raw_rr_msg)
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{
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struct gsm48_paging1 *p1 = (struct gsm48_paging1 *) raw_rr_msg;
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uint8_t chan_needed;
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unsigned int mi_len;
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uint8_t *mi;
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int rc;
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switch (p1->msg_type) {
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case GSM48_MT_RR_PAG_REQ_1:
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chan_needed = (p1->cneed2 << 2) | p1->cneed1;
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mi_len = p1->data[0];
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mi = p1->data+1;
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LOGP(DPCU, LOGL_ERROR, "PCU Sends paging "
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"request type %02x (chan_needed=%02x, mi_len=%u, mi=%s)\n",
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p1->msg_type, chan_needed, mi_len,
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osmo_hexdump_nospc(mi,mi_len));
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/* NOTE: We will have to add 2 to mi_len and subtract 2 from
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* the mi pointer because rsl_paging_cmd() will perform the
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* reverse operations. This is because rsl_paging_cmd() is
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* normally expected to chop off the element identifier (0xC0)
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* and the length field. In our parameter, we do not have
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* those fields included. */
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rc = rsl_paging_cmd(bts, paging_group, mi_len+2, mi-2,
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chan_needed, true);
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break;
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case GSM48_MT_RR_PAG_REQ_2:
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case GSM48_MT_RR_PAG_REQ_3:
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LOGP(DPCU, LOGL_ERROR, "PCU Sends unsupported paging "
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"request type %02x\n", p1->msg_type);
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rc = -EINVAL;
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break;
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default:
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LOGP(DPCU, LOGL_ERROR, "PCU Sends unknown paging "
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"request type %02x\n", p1->msg_type);
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rc = -EINVAL;
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break;
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}
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return rc;
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}
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static int pcu_rx_data_req(struct gsm_bts *bts, uint8_t msg_type,
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struct gsm_pcu_if_data *data_req)
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{
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struct msgb *msg;
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char imsi_digit_buf[4];
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uint32_t tlli = -1;
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uint8_t pag_grp;
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int rc = 0;
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LOGP(DPCU, LOGL_DEBUG, "Data request received: sapi=%s arfcn=%d "
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"block=%d data=%s\n", sapi_string[data_req->sapi],
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data_req->arfcn, data_req->block_nr,
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osmo_hexdump(data_req->data, data_req->len));
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switch (data_req->sapi) {
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case PCU_IF_SAPI_PCH:
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/* the first three bytes are the last three digits of
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* the IMSI, which we need to compute the paging group */
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imsi_digit_buf[0] = data_req->data[0];
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imsi_digit_buf[1] = data_req->data[1];
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imsi_digit_buf[2] = data_req->data[2];
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imsi_digit_buf[3] = '\0';
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LOGP(DPCU, LOGL_DEBUG, "SAPI PCH imsi %s\n", imsi_digit_buf);
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pag_grp = gsm0502_calc_paging_group(&bts->si_common.chan_desc,
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str_to_imsi(imsi_digit_buf));
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pcu_rx_rr_paging(bts, pag_grp, data_req->data+3);
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break;
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case PCU_IF_SAPI_AGCH:
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msg = msgb_alloc(data_req->len, "pcu_agch");
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if (!msg) {
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rc = -ENOMEM;
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break;
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}
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msg->l3h = msgb_put(msg, data_req->len);
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memcpy(msg->l3h, data_req->data, data_req->len);
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if (rsl_imm_assign_cmd(bts, msg->len, msg->data)) {
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msgb_free(msg);
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rc = -EIO;
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}
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break;
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case PCU_IF_SAPI_AGCH_DT:
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/* DT = direct tlli. A tlli is prefixed */
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if (data_req->len < 5) {
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LOGP(DPCU, LOGL_ERROR, "Received PCU data request with "
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"invalid/small length %d\n", data_req->len);
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break;
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}
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tlli = *((uint32_t *)data_req->data);
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msg = msgb_alloc(data_req->len - 4, "pcu_agch");
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if (!msg) {
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rc = -ENOMEM;
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break;
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}
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msg->l3h = msgb_put(msg, data_req->len - 4);
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memcpy(msg->l3h, data_req->data + 4, data_req->len - 4);
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|
|
|
if (bts->type == GSM_BTS_TYPE_RBS2000)
|
|
rc = rsl_ericsson_imm_assign_cmd(bts, tlli, msg->len, msg->data);
|
|
else
|
|
rc = rsl_imm_assign_cmd(bts, msg->len, msg->data);
|
|
|
|
if (rc) {
|
|
msgb_free(msg);
|
|
rc = -EIO;
|
|
}
|
|
break;
|
|
default:
|
|
LOGP(DPCU, LOGL_ERROR, "Received PCU data request with "
|
|
"unsupported sapi %d\n", data_req->sapi);
|
|
rc = -EINVAL;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int pcu_rx(struct gsm_network *net, uint8_t msg_type,
|
|
struct gsm_pcu_if *pcu_prim)
|
|
{
|
|
int rc = 0;
|
|
struct gsm_bts *bts;
|
|
|
|
/* FIXME: allow multiple BTS */
|
|
bts = llist_entry(net->bts_list.next, struct gsm_bts, list);
|
|
|
|
switch (msg_type) {
|
|
case PCU_IF_MSG_DATA_REQ:
|
|
case PCU_IF_MSG_PAG_REQ:
|
|
rc = pcu_rx_data_req(bts, msg_type, &pcu_prim->u.data_req);
|
|
break;
|
|
default:
|
|
LOGP(DPCU, LOGL_ERROR, "Received unknwon PCU msg type %d\n",
|
|
msg_type);
|
|
rc = -EINVAL;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* PCU socket interface
|
|
*/
|
|
|
|
static int pcu_sock_send(struct gsm_bts *bts, struct msgb *msg)
|
|
{
|
|
struct pcu_sock_state *state = bts->pcu_state;
|
|
struct osmo_fd *conn_bfd;
|
|
struct gsm_pcu_if *pcu_prim = (struct gsm_pcu_if *) msg->data;
|
|
|
|
if (!state) {
|
|
if (pcu_prim->msg_type != PCU_IF_MSG_TIME_IND)
|
|
LOGP(DPCU, LOGL_INFO, "PCU socket not created, "
|
|
"dropping message\n");
|
|
msgb_free(msg);
|
|
return -EINVAL;
|
|
}
|
|
conn_bfd = &state->conn_bfd;
|
|
if (conn_bfd->fd <= 0) {
|
|
if (pcu_prim->msg_type != PCU_IF_MSG_TIME_IND)
|
|
LOGP(DPCU, LOGL_NOTICE, "PCU socket not connected, "
|
|
"dropping message\n");
|
|
msgb_free(msg);
|
|
return -EIO;
|
|
}
|
|
msgb_enqueue(&state->upqueue, msg);
|
|
conn_bfd->when |= BSC_FD_WRITE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pcu_sock_close(struct pcu_sock_state *state)
|
|
{
|
|
struct osmo_fd *bfd = &state->conn_bfd;
|
|
struct gsm_bts *bts;
|
|
struct gsm_bts_trx *trx;
|
|
struct gsm_bts_trx_ts *ts;
|
|
int i, j;
|
|
|
|
/* FIXME: allow multiple BTS */
|
|
bts = llist_entry(state->net->bts_list.next, struct gsm_bts, list);
|
|
|
|
LOGP(DPCU, LOGL_NOTICE, "PCU socket has LOST connection\n");
|
|
|
|
close(bfd->fd);
|
|
bfd->fd = -1;
|
|
osmo_fd_unregister(bfd);
|
|
|
|
/* re-enable the generation of ACCEPT for new connections */
|
|
state->listen_bfd.when |= BSC_FD_READ;
|
|
|
|
#if 0
|
|
/* remove si13, ... */
|
|
bts->si_valid &= ~(1 << SYSINFO_TYPE_13);
|
|
osmo_signal_dispatch(SS_GLOBAL, S_NEW_SYSINFO, bts);
|
|
#endif
|
|
|
|
/* release PDCH */
|
|
for (i = 0; i < 8; i++) {
|
|
trx = gsm_bts_trx_num(bts, i);
|
|
if (!trx)
|
|
break;
|
|
for (j = 0; j < 8; j++) {
|
|
ts = &trx->ts[j];
|
|
if (ts->mo.nm_state.operational == NM_OPSTATE_ENABLED
|
|
&& ts->pchan == GSM_PCHAN_PDCH) {
|
|
printf("l1sap_chan_rel(trx,gsm_lchan2chan_nr(ts->lchan));\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
/* flush the queue */
|
|
while (!llist_empty(&state->upqueue)) {
|
|
struct msgb *msg = msgb_dequeue(&state->upqueue);
|
|
msgb_free(msg);
|
|
}
|
|
}
|
|
|
|
static int pcu_sock_read(struct osmo_fd *bfd)
|
|
{
|
|
struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data;
|
|
struct gsm_pcu_if *pcu_prim;
|
|
struct msgb *msg;
|
|
int rc;
|
|
|
|
msg = msgb_alloc(sizeof(*pcu_prim), "pcu_sock_rx");
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
pcu_prim = (struct gsm_pcu_if *) msg->tail;
|
|
|
|
rc = recv(bfd->fd, msg->tail, msgb_tailroom(msg), 0);
|
|
if (rc == 0)
|
|
goto close;
|
|
|
|
if (rc < 0) {
|
|
if (errno == EAGAIN)
|
|
return 0;
|
|
goto close;
|
|
}
|
|
|
|
rc = pcu_rx(state->net, pcu_prim->msg_type, pcu_prim);
|
|
|
|
/* as we always synchronously process the message in pcu_rx() and
|
|
* its callbacks, we can free the message here. */
|
|
msgb_free(msg);
|
|
|
|
return rc;
|
|
|
|
close:
|
|
msgb_free(msg);
|
|
pcu_sock_close(state);
|
|
return -1;
|
|
}
|
|
|
|
static int pcu_sock_write(struct osmo_fd *bfd)
|
|
{
|
|
struct pcu_sock_state *state = bfd->data;
|
|
int rc;
|
|
|
|
while (!llist_empty(&state->upqueue)) {
|
|
struct msgb *msg, *msg2;
|
|
struct gsm_pcu_if *pcu_prim;
|
|
|
|
/* peek at the beginning of the queue */
|
|
msg = llist_entry(state->upqueue.next, struct msgb, list);
|
|
pcu_prim = (struct gsm_pcu_if *)msg->data;
|
|
|
|
bfd->when &= ~BSC_FD_WRITE;
|
|
|
|
/* bug hunter 8-): maybe someone forgot msgb_put(...) ? */
|
|
if (!msgb_length(msg)) {
|
|
LOGP(DPCU, LOGL_ERROR, "message type (%d) with ZERO "
|
|
"bytes!\n", pcu_prim->msg_type);
|
|
goto dontsend;
|
|
}
|
|
|
|
/* try to send it over the socket */
|
|
rc = write(bfd->fd, msgb_data(msg), msgb_length(msg));
|
|
if (rc == 0)
|
|
goto close;
|
|
if (rc < 0) {
|
|
if (errno == EAGAIN) {
|
|
bfd->when |= BSC_FD_WRITE;
|
|
break;
|
|
}
|
|
goto close;
|
|
}
|
|
|
|
dontsend:
|
|
/* _after_ we send it, we can deueue */
|
|
msg2 = msgb_dequeue(&state->upqueue);
|
|
assert(msg == msg2);
|
|
msgb_free(msg);
|
|
}
|
|
return 0;
|
|
|
|
close:
|
|
pcu_sock_close(state);
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int pcu_sock_cb(struct osmo_fd *bfd, unsigned int flags)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (flags & BSC_FD_READ)
|
|
rc = pcu_sock_read(bfd);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
if (flags & BSC_FD_WRITE)
|
|
rc = pcu_sock_write(bfd);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* accept connection comming from PCU */
|
|
static int pcu_sock_accept(struct osmo_fd *bfd, unsigned int flags)
|
|
{
|
|
struct pcu_sock_state *state = (struct pcu_sock_state *)bfd->data;
|
|
struct osmo_fd *conn_bfd = &state->conn_bfd;
|
|
struct sockaddr_un un_addr;
|
|
socklen_t len;
|
|
int rc;
|
|
|
|
len = sizeof(un_addr);
|
|
rc = accept(bfd->fd, (struct sockaddr *) &un_addr, &len);
|
|
if (rc < 0) {
|
|
LOGP(DPCU, LOGL_ERROR, "Failed to accept a new connection\n");
|
|
return -1;
|
|
}
|
|
|
|
if (conn_bfd->fd >= 0) {
|
|
LOGP(DPCU, LOGL_NOTICE, "PCU connects but we already have "
|
|
"another active connection ?!?\n");
|
|
/* We already have one PCU connected, this is all we support */
|
|
state->listen_bfd.when &= ~BSC_FD_READ;
|
|
close(rc);
|
|
return 0;
|
|
}
|
|
|
|
conn_bfd->fd = rc;
|
|
conn_bfd->when = BSC_FD_READ;
|
|
conn_bfd->cb = pcu_sock_cb;
|
|
conn_bfd->data = state;
|
|
|
|
if (osmo_fd_register(conn_bfd) != 0) {
|
|
LOGP(DPCU, LOGL_ERROR, "Failed to register new connection "
|
|
"fd\n");
|
|
close(conn_bfd->fd);
|
|
conn_bfd->fd = -1;
|
|
return -1;
|
|
}
|
|
|
|
LOGP(DPCU, LOGL_NOTICE, "PCU socket connected to external PCU\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Open connection to PCU */
|
|
int pcu_sock_init(const char *path, struct gsm_bts *bts)
|
|
{
|
|
struct pcu_sock_state *state;
|
|
struct osmo_fd *bfd;
|
|
int rc;
|
|
|
|
state = talloc_zero(NULL, struct pcu_sock_state);
|
|
if (!state)
|
|
return -ENOMEM;
|
|
|
|
INIT_LLIST_HEAD(&state->upqueue);
|
|
state->net = bts->network;
|
|
state->conn_bfd.fd = -1;
|
|
|
|
bfd = &state->listen_bfd;
|
|
|
|
bfd->fd = osmo_sock_unix_init(SOCK_SEQPACKET, 0, path,
|
|
OSMO_SOCK_F_BIND);
|
|
if (bfd->fd < 0) {
|
|
LOGP(DPCU, LOGL_ERROR, "Could not create unix socket: %s\n",
|
|
strerror(errno));
|
|
talloc_free(state);
|
|
return -1;
|
|
}
|
|
|
|
bfd->when = BSC_FD_READ;
|
|
bfd->cb = pcu_sock_accept;
|
|
bfd->data = state;
|
|
|
|
rc = osmo_fd_register(bfd);
|
|
if (rc < 0) {
|
|
LOGP(DPCU, LOGL_ERROR, "Could not register listen fd: %d\n",
|
|
rc);
|
|
close(bfd->fd);
|
|
talloc_free(state);
|
|
return rc;
|
|
}
|
|
|
|
bts->pcu_state = state;
|
|
return 0;
|
|
}
|
|
|
|
/* Close connection to PCU */
|
|
void pcu_sock_exit(struct gsm_bts *bts)
|
|
{
|
|
struct pcu_sock_state *state = bts->pcu_state;
|
|
struct osmo_fd *bfd, *conn_bfd;
|
|
|
|
if (!state)
|
|
return;
|
|
|
|
conn_bfd = &state->conn_bfd;
|
|
if (conn_bfd->fd > 0)
|
|
pcu_sock_close(state);
|
|
bfd = &state->listen_bfd;
|
|
close(bfd->fd);
|
|
osmo_fd_unregister(bfd);
|
|
talloc_free(state);
|
|
bts->pcu_state = NULL;
|
|
}
|
|
|