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/* Local Call-Control Filter Code */
/*
* (C) 2013 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2013 by On-Waves
* 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 <openbsc/bsc_nat.h>
#include <openbsc/bsc_nat_sccp.h>
#include <openbsc/bsc_msc.h>
#include <openbsc/ipaccess.h>
#include <openbsc/vty.h>
#include <osmocom/gsm/protocol/gsm_08_08.h>
#include <osmocom/core/talloc.h>
void bsc_cc_update_msc_ip(struct bsc_nat *nat, const char *ip)
{
if (ip) {
bsc_replace_string(nat, &nat->local_dest->ip, ip);
} else {
talloc_free(nat->local_dest->ip);
nat->local_dest->ip = NULL;
}
/* re-connect if the local_conn was already created */
if (nat->local_conn)
bsc_msc_lost(nat->local_conn);
}
static void local_connection_connected(struct bsc_msc_connection *con)
{
struct bsc_nat *nat = con->data;
osmo_counter_inc(nat->stats.local_cc.reconn);
}
/**
* In contrast to forward_sccp_to_bts above we only work on already
* authenticated connections and will only forward parts of the connection.
* I am not sure how to reduce the copy and paste between the two routines
* yet!
*/
static int local_forward_sccp_to_bts(struct bsc_msc_connection *local_con,
struct msgb *msg)
{
struct nat_sccp_connection *con = NULL;
struct bsc_nat_parsed *parsed;
struct bsc_nat *nat;
int proto;
nat = local_con->data;
/* filter, drop, patch the message? */
parsed = bsc_nat_parse(msg);
if (!parsed) {
LOGP(DNAT, LOGL_ERROR, "Can not parse msg from BSC.\n");
return -1;
}
if (bsc_nat_filter_ipa(DIR_BSC, msg, parsed))
goto exit;
proto = parsed->ipa_proto;
if (proto != IPAC_PROTO_SCCP)
return -1;
switch (parsed->sccp_type) {
case SCCP_MSG_TYPE_UDT:
/* ignore */
break;
case SCCP_MSG_TYPE_RLSD:
case SCCP_MSG_TYPE_CREF:
case SCCP_MSG_TYPE_DT1:
case SCCP_MSG_TYPE_IT:
con = patch_sccp_src_ref_to_bsc(msg, parsed, nat);
if (parsed->gsm_type == BSS_MAP_MSG_ASSIGMENT_RQST) {
osmo_counter_inc(nat->stats.local_cc.calls);
#warning "TODO... MGCP handling needs to be defined..."
if (con) {
struct rate_ctr_group *ctrg;
ctrg = con->bsc->cfg->stats.ctrg;
rate_ctr_inc(&ctrg->ctr[BCFG_CTR_SCCP_LOC_CALLS]);
if (bsc_mgcp_assign_patch(con, msg) != 0)
LOGP(DNAT, LOGL_ERROR, "Failed to assign...\n");
} else
LOGP(DNAT, LOGL_ERROR, "Assignment command but no BSC.\n");
}
break;
case SCCP_MSG_TYPE_CC:
/* should not happen */
case SCCP_MSG_TYPE_RLC:
/* should not happen */
case SCCP_MSG_TYPE_CR:
/* MSC never opens a SCCP connection, fall through */
default:
goto exit;
}
exit:
talloc_free(parsed);
return 0;
}
int local_msc_read_cb(struct osmo_fd *bfd)
{
struct bsc_msc_connection *local_con;
struct ipaccess_head *hh;
struct msgb *msg;
int ret;
local_con = (struct bsc_msc_connection *) bfd->data;
ret = bsc_base_msc_read_cb(bfd, &msg);
if (ret == -1)
return ret;
if (ret == 1)
return 0;
/* TODO: MGCP handling */
hh = (struct ipaccess_head *) msg->data;
if (hh->proto == IPAC_PROTO_SCCP)
local_forward_sccp_to_bts(local_con, msg);
msgb_free(msg);
return 0;
}
static void local_connection_was_lost(struct bsc_msc_connection *con)
{
struct bsc_nat *nat = con->data;
LOGP(DMSC, LOGL_ERROR, "Local MSC disconnected. Closing things.\n");
/* Close local calls */
bsc_close_connections_by_type(nat, NAT_CON_END_CALL);
/* Only schedule the reconnect if we still have an IP address */
if (nat->local_dest->ip)
bsc_msc_schedule_connect(con);
}
int bsc_cc_initialize(struct bsc_nat *nat)
{
nat->local_conn = bsc_msc_create(nat, &nat->local_dests);
if (!nat->local_conn)
return -1;
nat->local_conn->name = "local MSC";
nat->local_conn->connection_loss = local_connection_was_lost;
nat->local_conn->connected = local_connection_connected;
nat->local_conn->write_queue.read_cb = local_msc_read_cb;
nat->local_conn->write_queue.write_cb = bsc_write_cb;
nat->local_conn->write_queue.bfd.data = nat->local_conn;
nat->local_conn->data = nat;
if (nat->local_dest->ip)
bsc_msc_connect(nat->local_conn);
return 0;
}
int bsc_cc_check(struct nat_sccp_connection *con, struct bsc_nat_parsed *parsed,
struct msgb *msg)
{
return 0;
}
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