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/* GPRS Subscriber Update Protocol client */
/* (C) 2014 by Sysmocom s.f.m.c. GmbH
* All Rights Reserved
*
* Author: Jacob Erlbeck
*
* 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 <openbsc/gprs_gsup_client.h>
#include <osmocom/abis/ipa.h>
#include <osmocom/gsm/protocol/ipaccess.h>
#include <osmocom/core/msgb.h>
#include <openbsc/debug.h>
#include <errno.h>
#include <string.h>
extern void *tall_bsc_ctx;
static int gsup_client_connect(struct gprs_gsup_client *gsupc)
{
int rc;
if (gsupc->is_connected)
return 0;
if (osmo_timer_pending(&gsupc->connect_timer)) {
LOGP(DLINP, LOGL_DEBUG,
"GSUP connect: connect timer already running\n");
osmo_timer_del(&gsupc->connect_timer);
}
if (ipa_client_conn_clear_queue(gsupc->link) > 0)
LOGP(DLINP, LOGL_DEBUG, "GSUP connect: discarded stored messages\n");
rc = ipa_client_conn_open(gsupc->link);
if (rc >= 0)
return rc;
LOGP(DGPRS, LOGL_INFO, "GSUP failed to connect to %s:%d: %s\n",
gsupc->link->addr, gsupc->link->port, strerror(-rc));
if (rc == -EBADF || rc == -ENOTSOCK || rc == -EAFNOSUPPORT ||
rc == -EINVAL)
return rc;
osmo_timer_schedule(&gsupc->connect_timer, GPRS_GSUP_RECONNECT_INTERVAL, 0);
return 0;
}
static void connect_timer_cb(void *gsupc_)
{
struct gprs_gsup_client *gsupc = gsupc_;
if (gsupc->is_connected)
return;
gsup_client_connect(gsupc);
}
static void gsup_client_updown_cb(struct ipa_client_conn *link, int up)
{
struct gprs_gsup_client *gsupc = link->data;
LOGP(DGPRS, LOGL_NOTICE, "GSUP link to %s:%d %s\n",
link->addr, link->port, up ? "UP" : "DOWN");
gsupc->is_connected = up;
if (up) {
/* TODO: Start ping procedure */
osmo_timer_del(&gsupc->connect_timer);
} else {
/* TODO: Stop ping procedure */
osmo_timer_schedule(&gsupc->connect_timer,
GPRS_GSUP_RECONNECT_INTERVAL, 0);
}
}
static int gsup_client_read_cb(struct ipa_client_conn *link, struct msgb *msg)
{
struct ipaccess_head *hh = (struct ipaccess_head *) msg->data;
struct ipaccess_head_ext *he = (struct ipaccess_head_ext *) msgb_l2(msg);
struct gprs_gsup_client *gsupc = (struct gprs_gsup_client *)link->data;
if (hh->proto != IPAC_PROTO_OSMO)
goto invalid;
if (!he || msgb_l2len(msg) < sizeof(*he) ||
he->proto != IPAC_PROTO_EXT_GSUP)
goto invalid;
msg->l2h = &he->data[0];
OSMO_ASSERT(gsupc->read_cb != NULL);
gsupc->read_cb(gsupc, msg);
/* Not freeing msg here, because that must be done by the read_cb. */
return 0;
invalid:
LOGP(DGPRS, LOGL_NOTICE,
"GSUP received an invalid IPA message from %s:%d, size = %d\n",
link->addr, link->port, msgb_length(msg));
msgb_free(msg);
return -1;
}
struct gprs_gsup_client *gprs_gsup_client_create(const char *ip_addr,
unsigned int tcp_port,
gprs_gsup_read_cb_t read_cb)
{
struct gprs_gsup_client *gsupc;
int rc;
gsupc = talloc_zero(tall_bsc_ctx, struct gprs_gsup_client);
OSMO_ASSERT(gsupc);
gsupc->link = ipa_client_conn_create(gsupc,
/* no e1inp */ NULL,
0,
ip_addr, tcp_port,
gsup_client_updown_cb,
gsup_client_read_cb,
/* default write_cb */ NULL,
gsupc);
if (!gsupc->link)
goto failed;
gsupc->connect_timer.data = gsupc;
gsupc->connect_timer.cb = &connect_timer_cb;
rc = gsup_client_connect(gsupc);
if (rc < 0 && rc != -EINPROGRESS)
goto failed;
gsupc->read_cb = read_cb;
return gsupc;
failed:
gprs_gsup_client_destroy(gsupc);
return NULL;
}
void gprs_gsup_client_destroy(struct gprs_gsup_client *gsupc)
{
osmo_timer_del(&gsupc->connect_timer);
if (gsupc->link) {
ipa_client_conn_close(gsupc->link);
ipa_client_conn_destroy(gsupc->link);
gsupc->link = NULL;
}
talloc_free(gsupc);
}
int gprs_gsup_client_send(struct gprs_gsup_client *gsupc, struct msgb *msg)
{
if (!gsupc) {
msgb_free(msg);
return -ENOTCONN;
}
if (!gsupc->is_connected) {
msgb_free(msg);
return -EAGAIN;
}
ipa_prepend_header_ext(msg, IPAC_PROTO_EXT_GSUP);
ipa_msg_push_header(msg, IPAC_PROTO_OSMO);
ipa_client_conn_send(gsupc->link, msg);
return 0;
}
struct msgb *gprs_gsup_msgb_alloc(void)
{
return msgb_alloc_headroom(4000, 64, __func__);
}
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