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/* pcu_main.cpp
*
* Copyright (C) 2012 Ivan Klyuchnikov
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <gprs_bssgp_pcu.h>
#include <arpa/inet.h>
#include <pcu_l1_if.h>
#include <gsm_timer.h>
#include <gprs_debug.h>
// TODO: We should move this parameters to config file.
#define SGSN_IP "127.0.0.1"
#define SGSN_PORT 23000
#define NSVCI 4
#define PCU_L1_IF_PORT 5944
struct l1fwd_hdl *l1fh = talloc_zero(NULL, struct l1fwd_hdl);
int sgsn_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc, struct msgb *msg, uint16_t bvci)
{
int rc = 0;
switch (event) {
case GPRS_NS_EVT_UNIT_DATA:
/* hand the message into the BSSGP implementation */
rc = gprs_bssgp_pcu_rcvmsg(msg);
break;
default:
LOGP(DPCU, LOGL_ERROR, "RLCMAC: Unknown event %u from NS\n", event);
if (msg)
talloc_free(msg);
rc = -EIO;
break;
}
return rc;
}
/* data has arrived on the udp socket */
static int udp_read_cb(struct osmo_fd *ofd)
{
struct msgb *msg = msgb_alloc_headroom(2048, 128, "udp_rx");
struct l1fwd_hdl *l1fh = (l1fwd_hdl *)ofd->data;
struct femtol1_hdl *fl1h = l1fh->fl1h;
int rc;
if (!msg)
return -ENOMEM;
msg->l1h = msg->data;
l1fh->remote_sa_len = sizeof(l1fh->remote_sa);
rc = recvfrom(ofd->fd, msg->l1h, msgb_tailroom(msg), 0,
(struct sockaddr *) &l1fh->remote_sa, &l1fh->remote_sa_len);
if (rc < 0) {
perror("read from udp");
msgb_free(msg);
return rc;
} else if (rc == 0) {
perror("len=0 read from udp");
msgb_free(msg);
return rc;
}
msgb_put(msg, rc);
rc = pcu_l1if_handle_l1prim(fl1h, msg);
return rc;
}
/* callback when we can write to the UDP socket */
static int udp_write_cb(struct osmo_fd *ofd, struct msgb *msg)
{
int rc;
struct l1fwd_hdl *l1fh = (l1fwd_hdl *)ofd->data;
//DEBUGP(DGPRS, "UDP: Writing %u bytes for MQ_L1_WRITE queue\n", msgb_l1len(msg));
rc = sendto(ofd->fd, msg->l1h, msgb_l1len(msg), 0,
(const struct sockaddr *)&l1fh->remote_sa, l1fh->remote_sa_len);
if (rc < 0) {
LOGP(DPCU, LOGL_ERROR, "error writing to L1 msg_queue: %s\n",
strerror(errno));
return rc;
} else if (rc < msgb_l1len(msg)) {
LOGP(DPCU, LOGL_ERROR, "short write to L1 msg_queue: "
"%u < %u\n", rc, msgb_l1len(msg));
return -EIO;
}
return 0;
}
int pcu_l1if_open()
{
//struct l1fwd_hdl *l1fh;
struct femtol1_hdl *fl1h;
int rc;
/* allocate new femtol1_handle */
fl1h = talloc_zero(NULL, struct femtol1_hdl);
INIT_LLIST_HEAD(&fl1h->wlc_list);
l1fh->fl1h = fl1h;
fl1h->priv = l1fh;
struct osmo_wqueue * queue = &((l1fh->fl1h)->write_q);
osmo_wqueue_init(queue, 10);
queue->bfd.when |= BSC_FD_READ;
queue->bfd.data = l1fh;
queue->bfd.priv_nr = 0;
/* Open UDP */
struct osmo_wqueue *wq = &l1fh->udp_wq;
osmo_wqueue_init(wq, 10);
wq->write_cb = udp_write_cb;
wq->read_cb = udp_read_cb;
wq->bfd.when |= BSC_FD_READ;
wq->bfd.data = l1fh;
wq->bfd.priv_nr = 0;
rc = osmo_sock_init_ofd(&wq->bfd, AF_UNSPEC, SOCK_DGRAM,
IPPROTO_UDP, NULL, PCU_L1_IF_PORT,
OSMO_SOCK_F_BIND);
if (rc < 0) {
perror("sock_init");
exit(1);
}
}
int main(int argc, char *argv[])
{
uint16_t nsvci = NSVCI;
struct gprs_ns_inst *sgsn_nsi;
struct gprs_nsvc *nsvc;
osmo_init_logging(&gprs_log_info);
pcu_l1if_open();
sgsn_nsi = gprs_ns_instantiate(&sgsn_ns_cb);
bssgp_nsi = sgsn_nsi;
if (!bssgp_nsi)
{
LOGP(DPCU, LOGL_ERROR, "Unable to instantiate NS\n");
exit(1);
}
bctx = btsctx_alloc(BVCI, NSEI);
bctx->cell_id = CELL_ID;
bctx->nsei = NSEI;
bctx->ra_id.mnc = MNC;
bctx->ra_id.mcc = MCC;
bctx->ra_id.lac = PCU_LAC;
bctx->ra_id.rac = PCU_RAC;
bctx->bvci = BVCI;
uint8_t cause = 39;
gprs_ns_nsip_listen(sgsn_nsi);
struct sockaddr_in dest;
dest.sin_family = AF_INET;
dest.sin_port = htons(SGSN_PORT);
inet_aton(SGSN_IP, &dest.sin_addr);
nsvc = nsip_connect(sgsn_nsi, &dest, NSEI, nsvci);
unsigned i = 0;
while (1)
{
osmo_gsm_timers_check();
osmo_gsm_timers_prepare();
osmo_gsm_timers_update();
osmo_select_main(0);
if (i == 7)
{
bssgp_tx_bvc_reset(bctx, BVCI, cause);
}
i++;
}
}
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