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/* Interface handler for Sysmocom L1 (forwarding) */
/* (C) 2011 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/select.h>
#include <osmocom/core/write_queue.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/socket.h>
#include <osmocom/gsm/gsm_utils.h>
#include <osmo-bts/logging.h>
#include <osmo-bts/gsm_data.h>
#include <sysmocom/femtobts/superfemto.h>
#include <sysmocom/femtobts/gsml1prim.h>
#include <sysmocom/femtobts/gsml1const.h>
#include <sysmocom/femtobts/gsml1types.h>
#include "femtobts.h"
#include "l1_if.h"
#include "l1_transp.h"
#include "l1_fwd.h"
static const uint16_t fwd_udp_ports[] = {
[MQ_SYS_WRITE] = L1FWD_SYS_PORT,
[MQ_L1_WRITE] = L1FWD_L1_PORT,
#ifndef HW_SYSMOBTS_V1
[MQ_TCH_WRITE] = L1FWD_TCH_PORT,
[MQ_PDTCH_WRITE]= L1FWD_PDTCH_PORT,
#endif
};
static int fwd_read_cb(struct osmo_fd *ofd)
{
struct msgb *msg = msgb_alloc_headroom(SYSMOBTS_PRIM_SIZE, 128, "udp_rx");
struct femtol1_hdl *fl1h = ofd->data;
int rc;
if (!msg)
return -ENOMEM;
msg->l1h = msg->data;
rc = read(ofd->fd, msg->l1h, msgb_tailroom(msg));
if (rc < 0) {
LOGP(DL1C, LOGL_ERROR, "Short read from UDP\n");
msgb_free(msg);
return rc;
} else if (rc == 0) {
LOGP(DL1C, LOGL_ERROR, "Len=0 from UDP\n");
msgb_free(msg);
return rc;
}
msgb_put(msg, rc);
if (ofd->priv_nr == MQ_SYS_WRITE)
rc = l1if_handle_sysprim(fl1h, msg);
else
rc = l1if_handle_l1prim(ofd->priv_nr, fl1h, msg);
return rc;
}
static int prim_write_cb(struct osmo_fd *ofd, struct msgb *msg)
{
/* write to the fd */
return write(ofd->fd, msg->head, msg->len);
}
int l1if_transport_open(int q, struct femtol1_hdl *fl1h)
{
int rc;
char *bts_host = getenv("L1FWD_BTS_HOST");
switch (q) {
case MQ_L1_WRITE:
LOGP(DL1C, LOGL_INFO, "sizeof(GsmL1_Prim_t) = %zu\n",
sizeof(GsmL1_Prim_t));
break;
case MQ_SYS_WRITE:
LOGP(DL1C, LOGL_INFO, "sizeof(SuperFemto_Prim_t) = %zu\n",
sizeof(SuperFemto_Prim_t));
break;
}
if (!bts_host) {
fprintf(stderr, "You have to set the L1FWD_BTS_HOST environment variable\n");
exit(2);
}
struct osmo_wqueue *wq = &fl1h->write_q[q];
struct osmo_fd *ofd = &wq->bfd;
osmo_wqueue_init(wq, 10);
wq->write_cb = prim_write_cb;
wq->read_cb = fwd_read_cb;
ofd->data = fl1h;
ofd->priv_nr = q;
ofd->when |= BSC_FD_READ;
rc = osmo_sock_init_ofd(ofd, AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP,
bts_host, fwd_udp_ports[q],
OSMO_SOCK_F_CONNECT);
if (rc < 0)
return rc;
return 0;
}
int l1if_transport_close(int q, struct femtol1_hdl *fl1h)
{
struct osmo_wqueue *wq = &fl1h->write_q[q];
struct osmo_fd *ofd = &wq->bfd;
osmo_wqueue_clear(wq);
osmo_fd_unregister(ofd);
close(ofd->fd);
return 0;
}
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