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/* (C) 2016 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 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 <osmocom/core/linuxlist.h>
#include <osmocom/core/talloc.h>
#include "logging.h"
#include "gsup_server.h"
#include "gsup_router.h"
/*! Find a route for the given address.
* \param[in] gs gsup server
* \param[in] addr IPA name of the client (SGSN, MSC/VLR). Although this is passed like a blob, together with the
* length, it must be nul-terminated! This is for legacy reasons, see the discussion here:
* https://gerrit.osmocom.org/#/c/osmo-hlr/+/13048/
* \param[in] addrlen length of addr, *including the nul-byte* (strlen(addr) + 1).
*/
struct osmo_gsup_conn *gsup_route_find(struct osmo_gsup_server *gs,
const uint8_t *addr, size_t addrlen)
{
struct gsup_route *gr;
llist_for_each_entry(gr, &gs->routes, list) {
if (talloc_total_size(gr->addr) == addrlen &&
!memcmp(gr->addr, addr, addrlen))
return gr->conn;
}
return NULL;
}
/*! Find a GSUP connection's route (to read the IPA address from the route).
* \param[in] conn GSUP connection
* \return GSUP route
*/
struct gsup_route *gsup_route_find_by_conn(const struct osmo_gsup_conn *conn)
{
struct gsup_route *gr;
llist_for_each_entry(gr, &conn->server->routes, list) {
if (gr->conn == conn)
return gr;
}
return NULL;
}
/* add a new route for the given address to the given conn */
int gsup_route_add(struct osmo_gsup_conn *conn, const uint8_t *addr, size_t addrlen)
{
struct gsup_route *gr;
/* Check if we already have a route for this address */
if (gsup_route_find(conn->server, addr, addrlen))
return -EEXIST;
/* allocate new route and populate it */
gr = talloc_zero(conn->server, struct gsup_route);
if (!gr)
return -ENOMEM;
LOGP(DMAIN, LOGL_INFO, "Adding GSUP route for %s via %s:%u\n", addr, conn->conn->addr, conn->conn->port);
gr->addr = talloc_memdup(gr, addr, addrlen);
gr->conn = conn;
llist_add_tail(&gr->list, &conn->server->routes);
return 0;
}
/* delete all routes for the given connection */
int gsup_route_del_conn(struct osmo_gsup_conn *conn)
{
struct gsup_route *gr, *gr2;
unsigned int num_deleted = 0;
llist_for_each_entry_safe(gr, gr2, &conn->server->routes, list) {
if (gr->conn == conn) {
LOGP(DMAIN, LOGL_INFO, "Removing GSUP route for %s (GSUP disconnect)\n",
gr->addr);
llist_del(&gr->list);
talloc_free(gr);
num_deleted++;
}
}
return num_deleted;
}
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