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/* Sysmocom femtobts L1 proxy */
/* (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 <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <arpa/inet.h>
#include <netinet/in.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/logging.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[_NUM_MQ_WRITE] = {
[MQ_SYS_READ] = L1FWD_SYS_PORT,
[MQ_L1_READ] = L1FWD_L1_PORT,
#ifndef HW_SYSMOBTS_V1
[MQ_TCH_READ] = L1FWD_TCH_PORT,
[MQ_PDTCH_READ] = L1FWD_PDTCH_PORT,
#endif
};
struct l1fwd_hdl {
struct sockaddr_storage remote_sa[_NUM_MQ_WRITE];
socklen_t remote_sa_len[_NUM_MQ_WRITE];
struct osmo_wqueue udp_wq[_NUM_MQ_WRITE];
struct femtol1_hdl *fl1h;
};
/* callback when there's a new L1 primitive coming in from the HW */
int l1if_handle_l1prim(int wq, struct femtol1_hdl *fl1h, struct msgb *msg)
{
struct l1fwd_hdl *l1fh = fl1h->priv;
/* Enqueue message to UDP socket */
return osmo_wqueue_enqueue(&l1fh->udp_wq[wq], msg);
}
/* callback when there's a new SYS primitive coming in from the HW */
int l1if_handle_sysprim(struct femtol1_hdl *fl1h, struct msgb *msg)
{
struct l1fwd_hdl *l1fh = fl1h->priv;
/* Enqueue message to UDP socket */
return osmo_wqueue_enqueue(&l1fh->udp_wq[MQ_SYS_WRITE], msg);
}
/* data has arrived on the udp socket */
static int udp_read_cb(struct osmo_fd *ofd)
{
struct msgb *msg = msgb_alloc_headroom(SYSMOBTS_PRIM_SIZE, 128, "udp_rx");
struct l1fwd_hdl *l1fh = ofd->data;
struct femtol1_hdl *fl1h = l1fh->fl1h;
int rc;
if (!msg)
return -ENOMEM;
msg->l1h = msg->data;
l1fh->remote_sa_len[ofd->priv_nr] = sizeof(l1fh->remote_sa[ofd->priv_nr]);
rc = recvfrom(ofd->fd, msg->l1h, msgb_tailroom(msg), 0,
(struct sockaddr *) &l1fh->remote_sa[ofd->priv_nr], &l1fh->remote_sa_len[ofd->priv_nr]);
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);
DEBUGP(DL1C, "UDP: Received %u bytes for queue %d\n", rc,
ofd->priv_nr);
/* put the message into the right queue */
rc = osmo_wqueue_enqueue(&fl1h->write_q[ofd->priv_nr], 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 = ofd->data;
DEBUGP(DL1C, "UDP: Writing %u bytes for queue %d\n", msgb_l1len(msg),
ofd->priv_nr);
rc = sendto(ofd->fd, msg->l1h, msgb_l1len(msg), 0,
(const struct sockaddr *)&l1fh->remote_sa[ofd->priv_nr], l1fh->remote_sa_len[ofd->priv_nr]);
if (rc < 0) {
LOGP(DL1C, LOGL_ERROR, "error writing to L1 msg_queue: %s\n",
strerror(errno));
return rc;
} else if (rc < msgb_l1len(msg)) {
LOGP(DL1C, LOGL_ERROR, "short write to L1 msg_queue: "
"%u < %u\n", rc, msgb_l1len(msg));
return -EIO;
}
return 0;
}
int main(int argc, char **argv)
{
struct l1fwd_hdl *l1fh;
struct femtol1_hdl *fl1h;
int rc, i;
printf("sizeof(GsmL1_Prim_t) = %zu\n", sizeof(GsmL1_Prim_t));
printf("sizeof(SuperFemto_Prim_t) = %zu\n", sizeof(SuperFemto_Prim_t));
bts_log_init(NULL);
/* allocate new femtol1_handle */
fl1h = talloc_zero(NULL, struct femtol1_hdl);
INIT_LLIST_HEAD(&fl1h->wlc_list);
/* open the actual hardware transport */
for (i = 0; i < ARRAY_SIZE(fl1h->write_q); i++) {
rc = l1if_transport_open(i, fl1h);
if (rc < 0)
exit(1);
}
/* create our fwd handle */
l1fh = talloc_zero(NULL, struct l1fwd_hdl);
l1fh->fl1h = fl1h;
fl1h->priv = l1fh;
/* Open UDP */
for (i = 0; i < ARRAY_SIZE(l1fh->udp_wq); i++) {
struct osmo_wqueue *wq = &l1fh->udp_wq[i];
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 = i;
rc = osmo_sock_init_ofd(&wq->bfd, AF_UNSPEC, SOCK_DGRAM,
IPPROTO_UDP, NULL, fwd_udp_ports[i],
OSMO_SOCK_F_BIND);
if (rc < 0) {
perror("sock_init");
exit(1);
}
}
while (1) {
rc = osmo_select_main(0);
if (rc < 0) {
perror("select");
exit(1);
}
}
exit(0);
}
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