diff options
Diffstat (limited to 'src/sysmo_l1_fwd.c')
| -rw-r--r-- | src/sysmo_l1_fwd.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/src/sysmo_l1_fwd.c b/src/sysmo_l1_fwd.c new file mode 100644 index 00000000..535a7f00 --- /dev/null +++ b/src/sysmo_l1_fwd.c @@ -0,0 +1,145 @@ +/* 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/core/timer.h> +#include <osmocom/gsm/gsm_utils.h> + +#include <sysmocom/femtobts/superfemto.h> +#include <sysmocom/femtobts/gsml1prim.h> +#include <sysmocom/femtobts/gsml1const.h> +#include <sysmocom/femtobts/gsml1types.h> + +#include "gprs_debug.h" +#include "sysmo_l1_if.h" + + +#define L1FWD_L1_PORT 9999 +#define L1FWD_SYS_PORT 9998 +#define L1FWD_TCH_PORT 9997 +#define L1FWD_PDTCH_PORT 9996 + +static const uint16_t fwd_udp_ports[] = { + [MQ_SYS_WRITE] = L1FWD_SYS_PORT, + [MQ_L1_WRITE] = L1FWD_L1_PORT, + [MQ_TCH_WRITE] = L1FWD_TCH_PORT, + [MQ_PDTCH_WRITE]= L1FWD_PDTCH_PORT, +}; + +static int fwd_read_cb(struct osmo_fd *ofd) +{ + struct msgb *msg = msgb_alloc_headroom(sizeof(SuperFemto_Prim_t) + 128, + 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(DL1IF, LOGL_ERROR, "Short read from UDP\n"); + msgb_free(msg); + return rc; + } else if (rc == 0) { + LOGP(DL1IF, 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"); + + printf("sizeof(GsmL1_Prim_t) = %zu\n", sizeof(GsmL1_Prim_t)); + printf("sizeof(SuperFemto_Prim_t) = %zu\n", sizeof(SuperFemto_Prim_t)); + + 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; +} |