418 lines
12 KiB
C
418 lines
12 KiB
C
/* (C) 2019 by Harald Welte <laforge@gnumonks.org>
|
|
* All Rights Reserved
|
|
*
|
|
* SPDX-License-Identifier: AGPL-3.0+
|
|
*
|
|
* 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 Affero 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 <errno.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
|
|
#include <osmocom/core/talloc.h>
|
|
#include <osmocom/core/select.h>
|
|
#include <osmocom/core/socket.h>
|
|
#include <osmocom/core/msgb.h>
|
|
#include <osmocom/core/logging.h>
|
|
#include <osmocom/core/fsm.h>
|
|
#include <osmocom/gsm/cbsp.h>
|
|
#include <osmocom/gsm/protocol/gsm_48_049.h>
|
|
#include <osmocom/netif/stream.h>
|
|
|
|
#include <osmocom/cbc/debug.h>
|
|
#include <osmocom/cbc/cbsp_link.h>
|
|
#include <osmocom/cbc/cbsp_link_fsm.h>
|
|
#include <osmocom/cbc/cbc_peer.h>
|
|
|
|
struct cbc_cbsp_link *cbc_cbsp_link_alloc(struct cbc_cbsp_mgr *cbc, struct cbc_peer *peer)
|
|
{
|
|
struct cbc_cbsp_link *link;
|
|
char *name;
|
|
|
|
link = talloc_zero(cbc, struct cbc_cbsp_link);
|
|
OSMO_ASSERT(link);
|
|
|
|
link->peer = peer;
|
|
link->is_client = (peer->link_mode == CBC_PEER_LINK_MODE_CLIENT);
|
|
|
|
name = talloc_strdup(link, peer->name);
|
|
osmo_identifier_sanitize_buf(name, NULL, '_');
|
|
link->fi = osmo_fsm_inst_alloc(&cbsp_link_fsm, link, link, LOGL_DEBUG, name);
|
|
if (!link->fi) {
|
|
LOGPCC(link, LOGL_ERROR, "Unable to allocate FSM\n");
|
|
talloc_free(link);
|
|
return NULL;
|
|
}
|
|
talloc_free(name);
|
|
|
|
llist_add_tail(&link->list, &cbc->links);
|
|
return link;
|
|
}
|
|
|
|
void cbc_cbsp_link_free(struct cbc_cbsp_link *link)
|
|
{
|
|
if (!link)
|
|
return;
|
|
llist_del(&link->list);
|
|
if (link->fi)
|
|
osmo_fsm_inst_free(link->fi);
|
|
talloc_free(link);
|
|
}
|
|
|
|
const char *cbc_cbsp_link_name(const struct cbc_cbsp_link *link)
|
|
{
|
|
struct osmo_fd *ofd;
|
|
OSMO_ASSERT(link);
|
|
|
|
if (link->peer && link->peer->name)
|
|
return link->peer->name;
|
|
|
|
if (link->is_client)
|
|
ofd = osmo_stream_cli_get_ofd(link->cli_conn);
|
|
else
|
|
ofd = osmo_stream_srv_get_ofd(link->srv_conn);
|
|
return osmo_sock_get_name2(ofd->fd);
|
|
}
|
|
|
|
/*
|
|
* TCP client
|
|
*/
|
|
static int cbc_cbsp_link_cli_connect_cb(struct osmo_stream_cli *conn)
|
|
{
|
|
struct cbc_cbsp_link *link = osmo_stream_cli_get_data(conn);
|
|
LOGPCC(link, LOGL_NOTICE, "Connected\n");
|
|
osmo_fsm_inst_dispatch(link->fi, CBSP_LINK_E_CMD_RESET, NULL);
|
|
return 0;
|
|
}
|
|
|
|
static int cbc_cbsp_link_cli_disconnect_cb(struct osmo_stream_cli *conn)
|
|
{
|
|
struct cbc_cbsp_link *link = osmo_stream_cli_get_data(conn);
|
|
LOGPCC(link, LOGL_NOTICE, "Disconnected.\n");
|
|
LOGPCC(link, LOGL_NOTICE, "Reconnecting...\n");
|
|
osmo_stream_cli_reconnect(conn);
|
|
return 0;
|
|
}
|
|
|
|
static int cbc_cbsp_link_cli_read_cb(struct osmo_stream_cli *conn)
|
|
{
|
|
struct cbc_cbsp_link *link = osmo_stream_cli_get_data(conn);
|
|
struct osmo_fd *ofd = osmo_stream_cli_get_ofd(conn);
|
|
struct osmo_cbsp_decoded *decoded;
|
|
struct msgb *msg = NULL;
|
|
int rc;
|
|
|
|
LOGPCC(link, LOGL_DEBUG, "read_cb rx_msg=%p\n", link->rx_msg);
|
|
|
|
/* message de-segmentation */
|
|
rc = osmo_cbsp_recv_buffered(conn, ofd->fd, &msg, &link->rx_msg);
|
|
if (rc <= 0) {
|
|
if (rc == -EAGAIN || rc == -EINTR) {
|
|
/* more data needs to be read */
|
|
return 0;
|
|
} else if (rc == -EPIPE || rc == -ECONNRESET) {
|
|
/* lost connection with server */
|
|
} else if (rc == 0) {
|
|
/* connection closed with server */
|
|
}
|
|
/* destroy connection */
|
|
cbc_cbsp_link_close(link);
|
|
return -EBADF;
|
|
}
|
|
OSMO_ASSERT(msg);
|
|
LOGPCC(link, LOGL_DEBUG, "Received CBSP %s\n", msgb_hexdump(msg));
|
|
/* decode + dispatch message */
|
|
decoded = osmo_cbsp_decode(link, msg);
|
|
if (decoded) {
|
|
LOGPCC(link, LOGL_INFO, "Received CBSP %s\n",
|
|
get_value_string(cbsp_msg_type_names, decoded->msg_type));
|
|
g_cbc->cbsp.mgr->rx_cb(link, decoded);
|
|
} else {
|
|
LOGPCC(link, LOGL_ERROR, "Unable to decode %s\n", msgb_hexdump(msg));
|
|
}
|
|
msgb_free(msg);
|
|
return 0;
|
|
}
|
|
|
|
int cbc_cbsp_link_open_cli(struct cbc_cbsp_link *link)
|
|
{
|
|
struct osmo_stream_cli *conn;
|
|
struct cbc_peer *peer = link->peer;
|
|
int rc;
|
|
|
|
OSMO_ASSERT(link->is_client);
|
|
OSMO_ASSERT(peer->link_mode == CBC_PEER_LINK_MODE_CLIENT);
|
|
|
|
conn = osmo_stream_cli_create(link);
|
|
osmo_stream_cli_set_data(conn, link);
|
|
osmo_stream_cli_set_nodelay(conn, true);
|
|
osmo_stream_cli_set_reconnect_timeout(conn, 5);
|
|
osmo_stream_cli_set_proto(conn, IPPROTO_TCP);
|
|
osmo_stream_cli_set_connect_cb(conn, cbc_cbsp_link_cli_connect_cb);
|
|
osmo_stream_cli_set_disconnect_cb(conn, cbc_cbsp_link_cli_disconnect_cb);
|
|
osmo_stream_cli_set_read_cb(conn, cbc_cbsp_link_cli_read_cb);
|
|
rc = osmo_stream_cli_set_local_addrs(conn, (const char **)&g_cbc->config.cbsp.local_host, 1);
|
|
if (rc < 0)
|
|
goto free_ret;
|
|
/* We assign free local port for client links:
|
|
* osmo_stream_cli_set_local_port(conn, g_cbc->cbsp.local_port);
|
|
*/
|
|
OSMO_ASSERT(peer->num_remote_host > 0);
|
|
rc = osmo_stream_cli_set_addrs(conn, (const char **)peer->remote_host, peer->num_remote_host);
|
|
if (rc < 0)
|
|
goto free_ret;
|
|
osmo_stream_cli_set_port(conn, peer->remote_port);
|
|
rc = osmo_stream_cli_open(conn);
|
|
if (rc < 0)
|
|
goto free_ret;
|
|
link->cli_conn = conn;
|
|
return 0;
|
|
free_ret:
|
|
osmo_stream_cli_destroy(conn);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* TCP server
|
|
*/
|
|
/* data from BSC has arrived at CBC */
|
|
static int cbsp_cbc_srv_read_cb(struct osmo_stream_srv *conn)
|
|
{
|
|
struct osmo_stream_srv_link *srv_link = osmo_stream_srv_get_master(conn);
|
|
struct cbc_cbsp_link *link = osmo_stream_srv_get_data(conn);
|
|
struct cbc_cbsp_mgr *cbc = osmo_stream_srv_link_get_data(srv_link);
|
|
struct osmo_fd *ofd = osmo_stream_srv_get_ofd(conn);
|
|
struct osmo_cbsp_decoded *decoded;
|
|
struct msgb *msg = NULL;
|
|
int rc;
|
|
|
|
LOGPCC(link, LOGL_DEBUG, "read_cb rx_msg=%p\n", link->rx_msg);
|
|
|
|
/* message de-segmentation */
|
|
rc = osmo_cbsp_recv_buffered(conn, ofd->fd, &msg, &link->rx_msg);
|
|
if (rc <= 0) {
|
|
if (rc == -EAGAIN || rc == -EINTR) {
|
|
/* more data needs to be read */
|
|
return 0;
|
|
} else if (rc == -EPIPE || rc == -ECONNRESET) {
|
|
/* lost connection with server */
|
|
} else if (rc == 0) {
|
|
/* connection closed with server */
|
|
|
|
}
|
|
/* destroy connection */
|
|
cbc_cbsp_link_close(link);
|
|
return -EBADF;
|
|
}
|
|
OSMO_ASSERT(msg);
|
|
LOGPCC(link, LOGL_DEBUG, "Received CBSP %s\n", msgb_hexdump(msg));
|
|
/* decode + dispatch message */
|
|
decoded = osmo_cbsp_decode(link, msg);
|
|
if (decoded) {
|
|
LOGPCC(link, LOGL_INFO, "Received CBSP %s\n",
|
|
get_value_string(cbsp_msg_type_names, decoded->msg_type));
|
|
cbc->rx_cb(link, decoded);
|
|
} else {
|
|
LOGPCC(link, LOGL_ERROR, "Unable to decode %s\n", msgb_hexdump(msg));
|
|
}
|
|
msgb_free(msg);
|
|
return 0;
|
|
}
|
|
|
|
/* connection from BSC to CBC has been closed */
|
|
static int cbsp_cbc_srv_closed_cb(struct osmo_stream_srv *conn)
|
|
{
|
|
struct cbc_cbsp_link *link = osmo_stream_srv_get_data(conn);
|
|
LOGPCC(link, LOGL_NOTICE, "connection closed\n");
|
|
|
|
if (link->peer)
|
|
link->peer->link.cbsp = NULL;
|
|
link->conn = NULL;
|
|
if (link->fi)
|
|
osmo_fsm_inst_dispatch(link->fi, CBSP_LINK_E_CMD_CLOSE, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* new connection from BSC has arrived at CBC */
|
|
static int cbsp_cbc_accept_cb(struct osmo_stream_srv_link *srv_link, int fd)
|
|
{
|
|
struct cbc_cbsp_mgr *cbc = osmo_stream_srv_link_get_data(srv_link);
|
|
struct cbc_peer *peer;
|
|
struct cbc_cbsp_link *link;
|
|
char remote_ip[INET6_ADDRSTRLEN], portbuf[6];
|
|
int remote_port;
|
|
|
|
remote_ip[0] = '\0';
|
|
portbuf[0] = '\0';
|
|
osmo_sock_get_ip_and_port(fd, remote_ip, sizeof(remote_ip), portbuf, sizeof(portbuf), false);
|
|
remote_port = atoi(portbuf);
|
|
|
|
LOGP(DCBSP, LOGL_NOTICE, "New CBSP link connection from %s:%u\n", remote_ip, remote_port);
|
|
|
|
/* Match link to peer */
|
|
peer = cbc_peer_by_addr_proto(remote_ip, remote_port, CBC_PEER_PROTO_CBSP);
|
|
if (!peer) {
|
|
if (!g_cbc->config.permit_unknown_peers) {
|
|
LOGP(DCBSP, LOGL_NOTICE,
|
|
"Rejecting unknown CBSP peer %s:%d (not permitted)\n",
|
|
remote_ip, remote_port);
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
LOGP(DCBSP, LOGL_NOTICE, "Accepting unknown CBSP peer %s:%d\n",
|
|
remote_ip, remote_port);
|
|
peer = cbc_peer_create(NULL, CBC_PEER_PROTO_CBSP);
|
|
OSMO_ASSERT(peer);
|
|
peer->unknown_dynamic_peer = true;
|
|
} else { /* peer is known */
|
|
switch (peer->link_mode) {
|
|
case CBC_PEER_LINK_MODE_DISABLED:
|
|
LOGP(DCBSP, LOGL_NOTICE,
|
|
"Rejecting conn for disabled CBSP peer %s:%d\n",
|
|
remote_ip, remote_port);
|
|
close(fd);
|
|
return -1;
|
|
case CBC_PEER_LINK_MODE_CLIENT:
|
|
LOGP(DCBSP, LOGL_NOTICE,
|
|
"Rejecting conn for CBSP peer %s:%d configured as 'client'\n",
|
|
remote_ip, remote_port);
|
|
close(fd);
|
|
return -1;
|
|
default: /* MODE_SERVER */
|
|
break;
|
|
}
|
|
}
|
|
if (peer->link.cbsp) {
|
|
LOGPCC(peer->link.cbsp, LOGL_ERROR,
|
|
"We already have a connection for peer %s, closing it\n",
|
|
peer->name);
|
|
cbc_cbsp_link_close(peer->link.cbsp);
|
|
}
|
|
link = cbc_cbsp_link_alloc(cbc, peer);
|
|
OSMO_ASSERT(link);
|
|
|
|
link->srv_conn = osmo_stream_srv_create(srv_link, srv_link, fd,
|
|
cbsp_cbc_srv_read_cb, cbsp_cbc_srv_closed_cb,
|
|
link);
|
|
if (!link->srv_conn) {
|
|
LOGPCC(link, LOGL_ERROR,
|
|
"Unable to create stream server for %s:%u\n",
|
|
remote_ip, remote_port);
|
|
cbc_cbsp_link_free(link);
|
|
return -1;
|
|
}
|
|
peer->link.cbsp = link;
|
|
|
|
osmo_fsm_inst_dispatch(link->fi, CBSP_LINK_E_CMD_RESET, NULL);
|
|
return 0;
|
|
}
|
|
|
|
int cbc_cbsp_link_tx(struct cbc_cbsp_link *link, struct osmo_cbsp_decoded *cbsp)
|
|
{
|
|
struct msgb *msg;
|
|
|
|
if (!link) {
|
|
LOGP(DCBSP, LOGL_NOTICE, "Cannot transmit %s: no connection\n",
|
|
get_value_string(cbsp_msg_type_names, cbsp->msg_type));
|
|
talloc_free(cbsp);
|
|
return -ENOLINK;
|
|
} else if (link->is_client && !osmo_stream_cli_is_connected(link->cli_conn)) {
|
|
LOGPCC(link, LOGL_NOTICE, "Cannot transmit %s: reconnecting\n",
|
|
get_value_string(cbsp_msg_type_names, cbsp->msg_type));
|
|
talloc_free(cbsp);
|
|
return -ENOTCONN;
|
|
}
|
|
|
|
LOGPCC(link, LOGL_INFO, "Transmitting %s\n",
|
|
get_value_string(cbsp_msg_type_names, cbsp->msg_type));
|
|
|
|
msg = osmo_cbsp_encode(link, cbsp);
|
|
if (!msg) {
|
|
LOGPCC(link, LOGL_ERROR, "Failed to encode CBSP %s: %s\n",
|
|
get_value_string(cbsp_msg_type_names, cbsp->msg_type), osmo_cbsp_errstr);
|
|
talloc_free(cbsp);
|
|
return -EINVAL;
|
|
}
|
|
talloc_free(cbsp);
|
|
if (link->is_client)
|
|
osmo_stream_cli_send(link->cli_conn, msg);
|
|
else
|
|
osmo_stream_srv_send(link->srv_conn, msg);
|
|
return 0;
|
|
}
|
|
|
|
void cbc_cbsp_link_close(struct cbc_cbsp_link *link)
|
|
{
|
|
if (!link->conn)
|
|
return;
|
|
|
|
if (link->is_client) {
|
|
osmo_stream_cli_destroy(link->cli_conn);
|
|
if (link->peer)
|
|
link->peer->link.cbsp = NULL;
|
|
link->cli_conn = NULL;
|
|
if (link->fi)
|
|
osmo_fsm_inst_dispatch(link->fi, CBSP_LINK_E_CMD_CLOSE, NULL);
|
|
} else {
|
|
osmo_stream_srv_destroy(link->srv_conn);
|
|
/* Same as waht's done for cli is done for srv in closed_cb() */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* CBSP Manager
|
|
*/
|
|
struct cbc_cbsp_mgr *cbc_cbsp_mgr_alloc(void *ctx)
|
|
{
|
|
struct cbc_cbsp_mgr *mgr;
|
|
|
|
mgr = talloc_zero(ctx, struct cbc_cbsp_mgr);
|
|
OSMO_ASSERT(mgr);
|
|
mgr->rx_cb = cbc_cbsp_link_rx_cb;
|
|
INIT_LLIST_HEAD(&mgr->links);
|
|
|
|
return mgr;
|
|
}
|
|
|
|
/* initialize the CBC-side CBSP server */
|
|
int cbc_cbsp_mgr_open_srv(struct cbc_cbsp_mgr *mgr)
|
|
{
|
|
char *bind_ip = g_cbc->config.cbsp.local_host;
|
|
int bind_port = g_cbc->config.cbsp.local_port;
|
|
struct osmo_stream_srv_link *srv_link;
|
|
int rc;
|
|
|
|
srv_link = osmo_stream_srv_link_create(mgr);
|
|
osmo_stream_srv_link_set_data(srv_link, mgr);
|
|
osmo_stream_srv_link_set_nodelay(srv_link, true);
|
|
osmo_stream_srv_link_set_port(srv_link, bind_port);
|
|
if (bind_ip)
|
|
osmo_stream_srv_link_set_addr(srv_link, bind_ip);
|
|
osmo_stream_srv_link_set_accept_cb(srv_link, cbsp_cbc_accept_cb);
|
|
rc = osmo_stream_srv_link_open(srv_link);
|
|
if (rc < 0) {
|
|
osmo_stream_srv_link_destroy(srv_link);
|
|
talloc_free(mgr);
|
|
return -EIO;
|
|
}
|
|
mgr->srv_link = srv_link;
|
|
LOGP(DCBSP, LOGL_NOTICE, "Listening for CBSP at %s\n",
|
|
osmo_stream_srv_link_get_sockname(mgr->srv_link));
|
|
return 0;
|
|
}
|