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osmo-bsc/src/libbsc/pcu_sock.c

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/* pcu_sock.c: Connect from PCU via unix domain socket */
/* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org>
* (C) 2009-2012 by Andreas Eversberg <jolly@eversberg.eu>
* (C) 2012 by Holger Hans Peter Freyther
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/select.h>
#include <osmocom/core/socket.h>
#include <osmocom/core/logging.h>
#include <osmocom/gsm/l1sap.h>
#include <osmocom/gsm/gsm0502.h>
#include <openbsc/gsm_data.h>
#include <openbsc/pcu_if.h>
#include <openbsc/pcuif_proto.h>
#include <openbsc/signal.h>
#include <openbsc/debug.h>
#include <openbsc/abis_rsl.h>
static int pcu_sock_send(struct gsm_bts *bts, struct msgb *msg);
uint32_t trx_get_hlayer1(struct gsm_bts_trx *trx);
int pcu_direct = 1;
static const char *sapi_string[] = {
[PCU_IF_SAPI_RACH] = "RACH",
[PCU_IF_SAPI_AGCH] = "AGCH",
[PCU_IF_SAPI_PCH] = "PCH",
[PCU_IF_SAPI_BCCH] = "BCCH",
[PCU_IF_SAPI_PDTCH] = "PDTCH",
[PCU_IF_SAPI_PRACH] = "PRACH",
[PCU_IF_SAPI_PTCCH] = "PTCCH",
[PCU_IF_SAPI_AGCH_DT] = "AGCH_DT",
};
/* Check if BTS has a PCU connection */
static bool pcu_connected(struct gsm_bts *bts)
{
struct pcu_sock_state *state = bts->pcu_state;
if (!state)
return false;
if (state->conn_bfd.fd <= 0)
return false;
return true;
}
/*
* PCU messages
*/
/* Set up an message buffer to package an pcu interface message */
struct msgb *pcu_msgb_alloc(uint8_t msg_type, uint8_t bts_nr)
{
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
msg = msgb_alloc(sizeof(struct gsm_pcu_if), "pcu_sock_tx");
if (!msg)
return NULL;
msgb_put(msg, sizeof(struct gsm_pcu_if));
pcu_prim = (struct gsm_pcu_if *) msg->data;
pcu_prim->msg_type = msg_type;
pcu_prim->bts_nr = bts_nr;
return msg;
}
/* Helper function exclusivly used by pcu_if_signal_cb() */
static bool ts_should_be_pdch(struct gsm_bts_trx_ts *ts) {
if (ts->pchan == GSM_PCHAN_PDCH)
return true;
if (ts->pchan == GSM_PCHAN_TCH_F_PDCH) {
/* When we're busy deactivating the PDCH, we first set
* DEACT_PENDING, tell the PCU about it and wait for a
* response. So DEACT_PENDING means "no PDCH" to the PCU.
* Similarly, when we're activating PDCH, we set the
* ACT_PENDING and wait for an activation response from the
* PCU, so ACT_PENDING means "is PDCH". */
if (ts->flags & TS_F_PDCH_ACTIVE)
return !(ts->flags & TS_F_PDCH_DEACT_PENDING);
else
return (ts->flags & TS_F_PDCH_ACT_PENDING);
}
if (ts->pchan == GSM_PCHAN_TCH_F_TCH_H_PDCH) {
/*
* When we're busy de-/activating the PDCH, we first set
* ts->dyn.pchan_want, tell the PCU about it and wait for a
* response. So only care about dyn.pchan_want here.
*/
return ts->dyn.pchan_want == GSM_PCHAN_PDCH;
}
return false;
}
/* Send BTS properties to the PCU */
static int pcu_tx_info_ind(struct gsm_bts *bts)
{
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
struct gsm_pcu_if_info_ind *info_ind;
struct gprs_rlc_cfg *rlcc;
struct gsm_bts_gprs_nsvc *nsvc;
struct gsm_bts_trx *trx;
struct gsm_bts_trx_ts *ts;
int i, j;
OSMO_ASSERT(bts);
OSMO_ASSERT(bts->network);
LOGP(DPCU, LOGL_INFO, "Sending info for BTS %d\n",bts->nr);
rlcc = &bts->gprs.cell.rlc_cfg;
msg = pcu_msgb_alloc(PCU_IF_MSG_INFO_IND, bts->nr);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
info_ind = &pcu_prim->u.info_ind;
info_ind->version = PCU_IF_VERSION;
info_ind->flags |= PCU_IF_FLAG_ACTIVE;
if (pcu_direct)
info_ind->flags |= PCU_IF_FLAG_SYSMO;
/* RAI */
info_ind->mcc = bts->network->country_code;
info_ind->mnc = bts->network->network_code;
info_ind->lac = bts->location_area_code;
info_ind->rac = bts->gprs.rac;
/* NSE */
info_ind->nsei = bts->gprs.nse.nsei;
memcpy(info_ind->nse_timer, bts->gprs.nse.timer, 7);
memcpy(info_ind->cell_timer, bts->gprs.cell.timer, 11);
/* cell attributes */
info_ind->cell_id = bts->cell_identity;
info_ind->repeat_time = rlcc->paging.repeat_time;
info_ind->repeat_count = rlcc->paging.repeat_count;
info_ind->bvci = bts->gprs.cell.bvci;
info_ind->t3142 = rlcc->parameter[RLC_T3142];
info_ind->t3169 = rlcc->parameter[RLC_T3169];
info_ind->t3191 = rlcc->parameter[RLC_T3191];
info_ind->t3193_10ms = rlcc->parameter[RLC_T3193];
info_ind->t3195 = rlcc->parameter[RLC_T3195];
info_ind->n3101 = rlcc->parameter[RLC_N3101];
info_ind->n3103 = rlcc->parameter[RLC_N3103];
info_ind->n3105 = rlcc->parameter[RLC_N3105];
info_ind->cv_countdown = rlcc->parameter[CV_COUNTDOWN];
if (rlcc->cs_mask & (1 << GPRS_CS1))
info_ind->flags |= PCU_IF_FLAG_CS1;
if (rlcc->cs_mask & (1 << GPRS_CS2))
info_ind->flags |= PCU_IF_FLAG_CS2;
if (rlcc->cs_mask & (1 << GPRS_CS3))
info_ind->flags |= PCU_IF_FLAG_CS3;
if (rlcc->cs_mask & (1 << GPRS_CS4))
info_ind->flags |= PCU_IF_FLAG_CS4;
if (bts->gprs.mode == BTS_GPRS_EGPRS) {
if (rlcc->cs_mask & (1 << GPRS_MCS1))
info_ind->flags |= PCU_IF_FLAG_MCS1;
if (rlcc->cs_mask & (1 << GPRS_MCS2))
info_ind->flags |= PCU_IF_FLAG_MCS2;
if (rlcc->cs_mask & (1 << GPRS_MCS3))
info_ind->flags |= PCU_IF_FLAG_MCS3;
if (rlcc->cs_mask & (1 << GPRS_MCS4))
info_ind->flags |= PCU_IF_FLAG_MCS4;
if (rlcc->cs_mask & (1 << GPRS_MCS5))
info_ind->flags |= PCU_IF_FLAG_MCS5;
if (rlcc->cs_mask & (1 << GPRS_MCS6))
info_ind->flags |= PCU_IF_FLAG_MCS6;
if (rlcc->cs_mask & (1 << GPRS_MCS7))
info_ind->flags |= PCU_IF_FLAG_MCS7;
if (rlcc->cs_mask & (1 << GPRS_MCS8))
info_ind->flags |= PCU_IF_FLAG_MCS8;
if (rlcc->cs_mask & (1 << GPRS_MCS9))
info_ind->flags |= PCU_IF_FLAG_MCS9;
}
#warning "isn't dl_tbf_ext wrong?: * 10 and no ntohs"
info_ind->dl_tbf_ext = rlcc->parameter[T_DL_TBF_EXT];
#warning "isn't ul_tbf_ext wrong?: * 10 and no ntohs"
info_ind->ul_tbf_ext = rlcc->parameter[T_UL_TBF_EXT];
info_ind->initial_cs = rlcc->initial_cs;
info_ind->initial_mcs = rlcc->initial_mcs;
/* NSVC */
for (i = 0; i < ARRAY_SIZE(info_ind->nsvci); i++) {
nsvc = &bts->gprs.nsvc[i];
info_ind->nsvci[i] = nsvc->nsvci;
info_ind->local_port[i] = nsvc->local_port;
info_ind->remote_port[i] = nsvc->remote_port;
info_ind->remote_ip[i] = nsvc->remote_ip;
}
for (i = 0; i < ARRAY_SIZE(info_ind->trx); i++) {
trx = gsm_bts_trx_num(bts, i);
if (!trx)
continue;
info_ind->trx[i].hlayer1 = 0x2342;
info_ind->trx[i].pdch_mask = 0;
info_ind->trx[i].arfcn = trx->arfcn;
for (j = 0; j < ARRAY_SIZE(trx->ts); j++) {
ts = &trx->ts[j];
if (ts->mo.nm_state.operational == NM_OPSTATE_ENABLED
&& ts_should_be_pdch(ts)) {
info_ind->trx[i].pdch_mask |= (1 << j);
info_ind->trx[i].tsc[j] =
(ts->tsc >= 0) ? ts->tsc : bts->bsic & 7;
LOGP(DPCU, LOGL_INFO, "trx=%d ts=%d: "
"available (tsc=%d arfcn=%d)\n",
trx->nr, ts->nr,
info_ind->trx[i].tsc[j],
info_ind->trx[i].arfcn);
}
}
}
return pcu_sock_send(bts, msg);
}
void pcu_info_update(struct gsm_bts *bts)
{
if (pcu_connected(bts))
pcu_tx_info_ind(bts);
}
/* Forward rach indication to PCU */
int pcu_tx_rach_ind(struct gsm_bts *bts, int16_t qta, uint16_t ra, uint32_t fn,
uint8_t is_11bit, enum ph_burst_type burst_type)
{
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
struct gsm_pcu_if_rach_ind *rach_ind;
/* Bail if no PCU is connected */
if (!pcu_connected(bts)) {
LOGP(DRSL, LOGL_ERROR, "BTS %d CHAN RQD(GPRS) but PCU not "
"connected!\n", bts->nr);
return -ENODEV;
}
LOGP(DPCU, LOGL_INFO, "Sending RACH indication: qta=%d, ra=%d, "
"fn=%d\n", qta, ra, fn);
msg = pcu_msgb_alloc(PCU_IF_MSG_RACH_IND, bts->nr);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
rach_ind = &pcu_prim->u.rach_ind;
rach_ind->sapi = PCU_IF_SAPI_RACH;
rach_ind->ra = ra;
rach_ind->qta = qta;
rach_ind->fn = fn;
rach_ind->is_11bit = is_11bit;
rach_ind->burst_type = burst_type;
return pcu_sock_send(bts, msg);
}
/* Confirm the sending of an immediate assignment to the pcu */
int pcu_tx_imm_ass_sent(struct gsm_bts *bts, uint32_t tlli)
{
struct msgb *msg;
struct gsm_pcu_if *pcu_prim;
struct gsm_pcu_if_data_cnf_dt *data_cnf_dt;
LOGP(DPCU, LOGL_INFO, "Sending PCH confirm with direct TLLI\n");
msg = pcu_msgb_alloc(PCU_IF_MSG_DATA_CNF_DT, bts->nr);
if (!msg)
return -ENOMEM;
pcu_prim = (struct gsm_pcu_if *) msg->data;
data_cnf_dt = &pcu_prim->u.data_cnf_dt;
data_cnf_dt->sapi = PCU_IF_SAPI_PCH;
data_cnf_dt->tlli = tlli;
return pcu_sock_send(bts, msg);
}
/* we need to decode the raw RR paging messsage (see PCU code
* Encoding::write_paging_request) and extract the mobile identity
* (P-TMSI) from it */
static int pcu_rx_rr_paging(struct gsm_bts *bts, uint8_t paging_group,
const uint8_t *raw_rr_msg)
{
struct gsm48_paging1 *p1 = (struct gsm48_paging1 *) raw_rr_msg;
uint8_t chan_needed;
unsigned int mi_len;
uint8_t *mi;
int rc;
switch (p1->msg_type) {
case GSM48_MT_RR_PAG_REQ_1:
chan_needed = (p1->cneed2 << 2) | p1->cneed1;
mi_len = p1->data[0];
mi = p1->data+1;
LOGP(DPCU, LOGL_ERROR, "PCU Sends paging "
"request type %02x (chan_needed=%02x, mi_len=%u, mi=%s)\n",
p1->msg_type, chan_needed, mi_len,
osmo_hexdump_nospc(mi,mi_len));
/* NOTE: We will have to add 2 to mi_len and subtract 2 from
* the mi pointer because rsl_paging_cmd() will perform the
* reverse operations. This is because rsl_paging_cmd() is
* normally expected to chop off the element identifier (0xC0)
* and the length field. In our parameter, we do not have
* those fields included. */
rc = rsl_paging_cmd(bts, paging_group, mi_len+2, mi-2,
chan_needed, true);
break;
case GSM48_MT_RR_PAG_REQ_2:
case GSM48_MT_RR_PAG_REQ_3:
LOGP(DPCU, LOGL_ERROR, "PCU Sends unsupported paging "
"request type %02x\n", p1->msg_type);
rc = -EINVAL;
break;
default:
LOGP(DPCU, LOGL_ERROR, "PCU Sends unknown paging "
"request type %02x\n", p1->msg_type);
rc = -EINVAL;
break;
}
return rc;
}
static int pcu_rx_data_req(struct gsm_bts *bts, uint8_t msg_type,
struct gsm_pcu_if_data *data_req)
{
uint8_t is_ptcch;
struct gsm_bts_trx *trx;
struct gsm_bts_trx_ts *ts;
struct msgb *msg;
char imsi_digit_buf[4];
uint32_t tlli = -1;
uint8_t pag_grp;
int rc = 0;
LOGP(DPCU, LOGL_DEBUG, "Data request received: sapi=%s arfcn=%d "
"block=%d data=%s\n", sapi_string[data_req->sapi],
data_req->arfcn, data_req->block_nr,
osmo_hexdump(data_req->data, data_req->len));
switch (data_req->sapi) {
case PCU_IF_SAPI_PCH:
/* the first three bytes are the last three digits of
* the IMSI, which we need to compute the paging group */
imsi_digit_buf[0] = data_req->data[0];
imsi_digit_buf[1] = data_req->data[1];
imsi_digit_buf[2] = data_req->data[2];
imsi_digit_buf[3] = '\0';
LOGP(DPCU, LOGL_DEBUG, "SAPI PCH imsi %s\n", imsi_digit_buf);
pag_grp = gsm0502_calc_paging_group(&bts->si_common.chan_desc,
str_to_imsi(imsi_digit_buf));
pcu_rx_rr_paging(bts, pag_grp, data_req->data+3);
break;
case PCU_IF_SAPI_AGCH:
msg = msgb_alloc(data_req->len, "pcu_agch");
if (!msg) {
rc = -ENOMEM;
break;
}
msg->l3h = msgb_put(msg, data_req->len);
memcpy(msg->l3h, data_req->data, data_req->len);
if (rsl_imm_assign_cmd(bts, msg->len, msg->data)) {
msgb_free(msg);
rc = -EIO;
}
break;
case PCU_IF_SAPI_AGCH_DT:
/* DT = direct tlli. A tlli is prefixed */
if (data_req->len < 5) {
LOGP(DPCU, LOGL_ERROR, "Received PCU data request with "
"invalid/small length %d\n", data_req->len);
break;
}
tlli = *((uint32_t *)data_req->data);
msg = msgb_alloc(data_req->len - 4, "pcu_agch");
if (!msg) {
rc = -ENOMEM;
break;
}
msg->l3h = msgb_put(msg, data_req->len - 4);
memcpy(msg->l3h, data_req->data + 4, data_req->len - 4);
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;
}
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