235 lines
6.0 KiB
C
235 lines
6.0 KiB
C
/* Sysmocom femtobts L1 proxy */
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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 Affero 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 <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/socket.h>
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#include <sys/stat.h>
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#include <arpa/inet.h>
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#include <netinet/in.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/logging.h>
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#include <osmocom/core/socket.h>
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#include <osmocom/core/application.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include <osmo-bts/logging.h>
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#include <osmo-bts/gsm_data.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 "femtobts.h"
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#include "l1_if.h"
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#include "l1_transp.h"
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#include "l1_fwd.h"
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static const uint16_t fwd_udp_ports[_NUM_MQ_WRITE] = {
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[MQ_SYS_READ] = L1FWD_SYS_PORT,
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[MQ_L1_READ] = L1FWD_L1_PORT,
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#ifndef HW_SYSMOBTS_V1
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[MQ_TCH_READ] = L1FWD_TCH_PORT,
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[MQ_PDTCH_READ] = L1FWD_PDTCH_PORT,
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#endif
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};
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struct l1fwd_hdl {
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struct sockaddr_storage remote_sa[_NUM_MQ_WRITE];
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socklen_t remote_sa_len[_NUM_MQ_WRITE];
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struct osmo_wqueue udp_wq[_NUM_MQ_WRITE];
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struct femtol1_hdl *fl1h;
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};
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/* callback when there's a new L1 primitive coming in from the HW */
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int l1if_handle_l1prim(int wq, struct femtol1_hdl *fl1h, struct msgb *msg)
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{
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struct l1fwd_hdl *l1fh = fl1h->priv;
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/* Enqueue message to UDP socket */
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if (osmo_wqueue_enqueue(&l1fh->udp_wq[wq], msg) != 0) {
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LOGP(DL1C, LOGL_ERROR, "Write queue %d full. dropping msg\n", wq);
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msgb_free(msg);
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return -EAGAIN;
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}
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return 0;
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}
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/* callback when there's a new SYS primitive coming in from the HW */
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int l1if_handle_sysprim(struct femtol1_hdl *fl1h, struct msgb *msg)
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{
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struct l1fwd_hdl *l1fh = fl1h->priv;
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/* Enqueue message to UDP socket */
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if (osmo_wqueue_enqueue(&l1fh->udp_wq[MQ_SYS_WRITE], msg) != 0) {
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LOGP(DL1C, LOGL_ERROR, "MQ_SYS_WRITE ful. dropping msg\n");
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msgb_free(msg);
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return -EAGAIN;
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}
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return 0;
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}
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/* data has arrived on the udp socket */
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static int udp_read_cb(struct osmo_fd *ofd)
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{
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struct msgb *msg = msgb_alloc_headroom(SYSMOBTS_PRIM_SIZE, 128, "udp_rx");
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struct l1fwd_hdl *l1fh = ofd->data;
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struct femtol1_hdl *fl1h = l1fh->fl1h;
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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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l1fh->remote_sa_len[ofd->priv_nr] = sizeof(l1fh->remote_sa[ofd->priv_nr]);
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rc = recvfrom(ofd->fd, msg->l1h, msgb_tailroom(msg), 0,
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(struct sockaddr *) &l1fh->remote_sa[ofd->priv_nr], &l1fh->remote_sa_len[ofd->priv_nr]);
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if (rc < 0) {
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perror("read from udp");
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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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perror("len=0 read from udp");
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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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DEBUGP(DL1C, "UDP: Received %u bytes for queue %d\n", rc,
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ofd->priv_nr);
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/* put the message into the right queue */
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if (osmo_wqueue_enqueue(&fl1h->write_q[ofd->priv_nr], msg) != 0) {
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LOGP(DL1C, LOGL_ERROR, "Write queue %d full. dropping msg\n",
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ofd->priv_nr);
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msgb_free(msg);
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return -EAGAIN;
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}
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return 0;
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}
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/* callback when we can write to the UDP socket */
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static int udp_write_cb(struct osmo_fd *ofd, struct msgb *msg)
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{
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int rc;
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struct l1fwd_hdl *l1fh = ofd->data;
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DEBUGP(DL1C, "UDP: Writing %u bytes for queue %d\n", msgb_l1len(msg),
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ofd->priv_nr);
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rc = sendto(ofd->fd, msg->l1h, msgb_l1len(msg), 0,
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(const struct sockaddr *)&l1fh->remote_sa[ofd->priv_nr], l1fh->remote_sa_len[ofd->priv_nr]);
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if (rc < 0) {
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LOGP(DL1C, LOGL_ERROR, "error writing to L1 msg_queue: %s\n",
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strerror(errno));
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return rc;
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} else if (rc < msgb_l1len(msg)) {
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LOGP(DL1C, LOGL_ERROR, "short write to L1 msg_queue: "
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"%u < %u\n", rc, msgb_l1len(msg));
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return -EIO;
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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struct l1fwd_hdl *l1fh;
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struct femtol1_hdl *fl1h;
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int rc, i;
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void *ctx = talloc_named_const(NULL, 0, "l1_fwd");
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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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osmo_init_logging2(ctx, &bts_log_info);
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/*
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* hack and prevent that two l1fwd-proxy/sysmobts run at the same
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* time. This is done by binding to the same VTY port.
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*/
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rc = osmo_sock_init(AF_UNSPEC, SOCK_STREAM, IPPROTO_TCP,
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"127.0.0.1", 4241, OSMO_SOCK_F_BIND);
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if (rc < 0) {
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fprintf(stderr, "Failed to bind to the BTS VTY port.\n");
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return EXIT_FAILURE;
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}
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/* allocate new femtol1_handle */
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fl1h = talloc_zero(ctx, struct femtol1_hdl);
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INIT_LLIST_HEAD(&fl1h->wlc_list);
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/* open the actual hardware transport */
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for (i = 0; i < ARRAY_SIZE(fl1h->write_q); i++) {
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rc = l1if_transport_open(i, fl1h);
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if (rc < 0)
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exit(1);
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}
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/* create our fwd handle */
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l1fh = talloc_zero(ctx, struct l1fwd_hdl);
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l1fh->fl1h = fl1h;
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fl1h->priv = l1fh;
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/* Open UDP */
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for (i = 0; i < ARRAY_SIZE(l1fh->udp_wq); i++) {
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struct osmo_wqueue *wq = &l1fh->udp_wq[i];
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osmo_wqueue_init(wq, 10);
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wq->write_cb = udp_write_cb;
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wq->read_cb = udp_read_cb;
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osmo_fd_setup(&wq->bfd, -1, OSMO_FD_READ, osmo_wqueue_bfd_cb, l1fh, i);
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rc = osmo_sock_init_ofd(&wq->bfd, AF_UNSPEC, SOCK_DGRAM,
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IPPROTO_UDP, NULL, fwd_udp_ports[i],
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OSMO_SOCK_F_BIND);
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if (rc < 0) {
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perror("sock_init");
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exit(1);
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}
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}
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while (1) {
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rc = osmo_select_main(0);
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if (rc < 0) {
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perror("select");
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exit(1);
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}
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}
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exit(0);
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}
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