143 lines
3.5 KiB
C
143 lines
3.5 KiB
C
/* Interface handler for Sysmocom L1 (forwarding) */
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/* (C) 2011 by Harald Welte <laforge@gnumonks.org>
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*
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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 Affero General Public License as published by
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* the Free Software Foundation; either version 3 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 Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/write_queue.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/core/timer.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include <sysmocom/femtobts/superfemto.h>
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#include <sysmocom/femtobts/gsml1prim.h>
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#include <sysmocom/femtobts/gsml1const.h>
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#include <sysmocom/femtobts/gsml1types.h>
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#include "gprs_debug.h"
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#include "sysmo_l1_if.h"
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#define L1FWD_L1_PORT 9999
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#define L1FWD_SYS_PORT 9998
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#define L1FWD_TCH_PORT 9997
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#define L1FWD_PDTCH_PORT 9996
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static const uint16_t fwd_udp_ports[] = {
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[MQ_SYS_WRITE] = L1FWD_SYS_PORT,
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[MQ_L1_WRITE] = L1FWD_L1_PORT,
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[MQ_TCH_WRITE] = L1FWD_TCH_PORT,
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[MQ_PDTCH_WRITE]= L1FWD_PDTCH_PORT,
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};
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static int fwd_read_cb(struct osmo_fd *ofd)
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{
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struct msgb *msg = msgb_alloc_headroom(sizeof(SuperFemto_Prim_t) + 128,
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128, "udp_rx");
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struct femtol1_hdl *fl1h = ofd->data;
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int rc;
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if (!msg)
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return -ENOMEM;
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msg->l1h = msg->data;
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rc = read(ofd->fd, msg->l1h, msgb_tailroom(msg));
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if (rc < 0) {
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LOGP(DL1IF, LOGL_ERROR, "Short read from UDP\n");
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msgb_free(msg);
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return rc;
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} else if (rc == 0) {
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LOGP(DL1IF, LOGL_ERROR, "Len=0 from UDP\n");
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msgb_free(msg);
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return rc;
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}
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msgb_put(msg, rc);
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if (ofd->priv_nr == MQ_SYS_WRITE)
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rc = l1if_handle_sysprim(fl1h, msg);
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else
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rc = l1if_handle_l1prim(ofd->priv_nr, fl1h, msg);
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return rc;
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}
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static int prim_write_cb(struct osmo_fd *ofd, struct msgb *msg)
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{
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/* write to the fd */
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return write(ofd->fd, msg->head, msg->len);
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}
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int l1if_transport_open(int q, struct femtol1_hdl *fl1h)
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{
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int rc;
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char *bts_host = getenv("L1FWD_BTS_HOST");
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printf("sizeof(GsmL1_Prim_t) = %zu\n", sizeof(GsmL1_Prim_t));
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printf("sizeof(SuperFemto_Prim_t) = %zu\n", sizeof(SuperFemto_Prim_t));
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if (!bts_host) {
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fprintf(stderr, "You have to set the L1FWD_BTS_HOST environment variable\n");
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exit(2);
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}
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struct osmo_wqueue *wq = &fl1h->write_q[q];
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struct osmo_fd *ofd = &wq->bfd;
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osmo_wqueue_init(wq, 10);
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wq->write_cb = prim_write_cb;
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wq->read_cb = fwd_read_cb;
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osmo_fd_setup(ofd, -1, OSMO_FD_READ, osmo_wqueue_bfd_cb, fl1h, q);
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rc = osmo_sock_init_ofd(ofd, AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP,
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bts_host, fwd_udp_ports[q],
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OSMO_SOCK_F_CONNECT);
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if (rc < 0)
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return rc;
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return 0;
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}
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int l1if_transport_close(int q, struct femtol1_hdl *fl1h)
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{
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struct osmo_wqueue *wq = &fl1h->write_q[q];
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struct osmo_fd *ofd = &wq->bfd;
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osmo_wqueue_clear(wq);
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osmo_fd_unregister(ofd);
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close(ofd->fd);
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return 0;
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}
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