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/* Layer 1 socket interface of layer2/3 stack */
/* (C) 2010 by Holger Hans Peter Freyther
* (C) 2010,2018 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 General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include <osmocom/bb/common/osmocom_data.h>
#include <osmocom/bb/common/l1ctl.h>
#include <osmocom/bb/common/logging.h>
#include <osmocom/bb/common/l1l2_interface.h>
#include <osmocom/core/utils.h>
#include <osmocom/core/socket.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <arpa/inet.h>
#define _GNU_SOURCE
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#define GSM_L2_LENGTH 256
#define GSM_L2_HEADROOM 32
static int layer2_read(struct osmo_fd *fd)
{
struct msgb *msg;
uint16_t len;
int rc;
msg = msgb_alloc_headroom(GSM_L2_LENGTH+GSM_L2_HEADROOM, GSM_L2_HEADROOM, "Layer2");
if (!msg) {
LOGP(DL1C, LOGL_ERROR, "Failed to allocate msg.\n");
return -ENOMEM;
}
rc = read(fd->fd, &len, sizeof(len));
if (rc < sizeof(len)) {
fprintf(stderr, "Layer2 socket failed\n");
msgb_free(msg);
if (rc >= 0)
rc = -EIO;
layer2_close((struct osmocom_ms *) fd->data);
return rc;
}
len = ntohs(len);
if (len > GSM_L2_LENGTH) {
LOGP(DL1C, LOGL_ERROR, "Length is too big: %u\n", len);
msgb_free(msg);
return -EINVAL;
}
msg->l1h = msgb_put(msg, len);
rc = read(fd->fd, msg->l1h, msgb_l1len(msg));
if (rc != msgb_l1len(msg)) {
LOGP(DL1C, LOGL_ERROR, "Can not read data: len=%d rc=%d "
"errno=%d\n", len, rc, errno);
msgb_free(msg);
return rc;
}
l1ctl_recv((struct osmocom_ms *) fd->data, msg);
return 0;
}
static int layer2_write(struct osmo_fd *fd, struct msgb *msg)
{
int rc;
if (fd->fd <= 0)
return -EINVAL;
rc = write(fd->fd, msg->data, msg->len);
if (rc != msg->len) {
LOGP(DL1C, LOGL_ERROR, "Failed to write data: rc: %d\n", rc);
return rc;
}
return 0;
}
int layer2_open(struct osmocom_ms *ms, const char *socket_path)
{
int rc;
rc = osmo_sock_unix_init_ofd(&ms->l2_wq.bfd, SOCK_STREAM, 0, socket_path, OSMO_SOCK_F_CONNECT);
if (rc < 0) {
LOGP(DL1C, LOGL_ERROR, "Failed to create unix domain socket %s: %s\n",
socket_path, strerror(-rc));
return rc;
}
osmo_wqueue_init(&ms->l2_wq, 100);
ms->l2_wq.bfd.data = ms;
ms->l2_wq.read_cb = layer2_read;
ms->l2_wq.write_cb = layer2_write;
return 0;
}
int layer2_close(struct osmocom_ms *ms)
{
if (ms->l2_wq.bfd.fd <= 0)
return -EINVAL;
close(ms->l2_wq.bfd.fd);
ms->l2_wq.bfd.fd = -1;
osmo_fd_unregister(&ms->l2_wq.bfd);
osmo_wqueue_clear(&ms->l2_wq);
return 0;
}
int osmo_send_l1(struct osmocom_ms *ms, struct msgb *msg)
{
DEBUGP(DL1C, "Sending: '%s'\n", osmo_hexdump(msg->data, msg->len));
if (msg->l1h != msg->data)
LOGP(DL1C, LOGL_ERROR, "Message L1 header != Message Data\n");
/* prepend 16bit length before sending */
msgb_push_u16(msg, msg->len);
if (osmo_wqueue_enqueue(&ms->l2_wq, msg) != 0) {
LOGP(DL1C, LOGL_ERROR, "Failed to enqueue msg.\n");
msgb_free(msg);
return -1;
}
return 0;
}
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