aboutsummaryrefslogtreecommitdiffstats
path: root/src/libmsc/msc_ifaces.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libmsc/msc_ifaces.c')
-rw-r--r--src/libmsc/msc_ifaces.c423
1 files changed, 0 insertions, 423 deletions
diff --git a/src/libmsc/msc_ifaces.c b/src/libmsc/msc_ifaces.c
deleted file mode 100644
index 161a10019..000000000
--- a/src/libmsc/msc_ifaces.c
+++ /dev/null
@@ -1,423 +0,0 @@
-/* Implementation for MSC decisions which interface to send messages out on. */
-
-/* (C) 2016 by sysmocom s.m.f.c GmbH <info@sysmocom.de>
- *
- * 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 <osmocom/core/logging.h>
-
-#include <openbsc/debug.h>
-#include <openbsc/gsm_data.h>
-#include <openbsc/msc_ifaces.h>
-#include <openbsc/gsm_subscriber.h>
-#include <openbsc/transaction.h>
-#include <osmocom/legacy_mgcp/mgcp.h>
-#include <osmocom/legacy_mgcp/mgcpgw_client.h>
-#include <openbsc/vlr.h>
-#include <openbsc/a_iface.h>
-
-#include "../../bscconfig.h"
-
-#ifdef BUILD_IU
-#include <osmocom/ranap/iu_client.h>
-extern struct msgb *ranap_new_msg_rab_assign_voice(uint8_t rab_id,
- uint32_t rtp_ip,
- uint16_t rtp_port,
- bool use_x213_nsap);
-#else
-#include <openbsc/iu_dummy.h>
-#endif /* BUILD_IU */
-
-static int msc_tx(struct gsm_subscriber_connection *conn, struct msgb *msg)
-{
- if (!conn)
- return -EINVAL;
- if (!msg)
- return -EINVAL;
-
- DEBUGP(DMSC, "msc_tx %u bytes to %s via %s\n",
- msg->len, vlr_subscr_name(conn->vsub),
- ran_type_name(conn->via_ran));
- switch (conn->via_ran) {
- case RAN_GERAN_A:
- msg->dst = conn;
- return a_iface_tx_dtap(msg);
-
- case RAN_UTRAN_IU:
- msg->dst = conn->iu.ue_ctx;
- return ranap_iu_tx(msg, 0);
-
- default:
- LOGP(DMSC, LOGL_ERROR,
- "msc_tx(): conn->via_ran invalid (%d)\n",
- conn->via_ran);
- return -1;
- }
-}
-
-
-int msc_tx_dtap(struct gsm_subscriber_connection *conn,
- struct msgb *msg)
-{
- return msc_tx(conn, msg);
-}
-
-
-/* 9.2.5 CM service accept */
-int msc_gsm48_tx_mm_serv_ack(struct gsm_subscriber_connection *conn)
-{
- struct msgb *msg;
- struct gsm48_hdr *gh;
-
- if (!conn)
- return -EINVAL;
-
- msg = gsm48_msgb_alloc_name("GSM 04.08 SERV ACC");
-
- gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
- gh->proto_discr = GSM48_PDISC_MM;
- gh->msg_type = GSM48_MT_MM_CM_SERV_ACC;
-
- DEBUGP(DMM, "-> CM SERVICE ACCEPT %s\n",
- vlr_subscr_name(conn->vsub));
-
- return msc_tx_dtap(conn, msg);
-}
-
-/* 9.2.6 CM service reject */
-int msc_gsm48_tx_mm_serv_rej(struct gsm_subscriber_connection *conn,
- enum gsm48_reject_value value)
-{
- struct msgb *msg;
-
- if (!conn)
- return -EINVAL;
-
- conn->received_cm_service_request = false;
-
- msg = gsm48_create_mm_serv_rej(value);
- if (!msg) {
- LOGP(DMM, LOGL_ERROR, "Failed to allocate CM Service Reject.\n");
- return -1;
- }
-
- DEBUGP(DMM, "-> CM SERVICE Reject cause: %d\n", value);
-
- return msc_tx_dtap(conn, msg);
-}
-
-int msc_tx_common_id(struct gsm_subscriber_connection *conn)
-{
- if (!conn)
- return -EINVAL;
-
- /* Common ID is only sent over IuCS */
- if (conn->via_ran != RAN_UTRAN_IU) {
- LOGP(DMM, LOGL_INFO,
- "%s: Asked to transmit Common ID, but skipping"
- " because this is not on UTRAN\n",
- vlr_subscr_name(conn->vsub));
- return 0;
- }
-
- DEBUGP(DIUCS, "%s: tx CommonID %s\n",
- vlr_subscr_name(conn->vsub), conn->vsub->imsi);
- return ranap_iu_tx_common_id(conn->iu.ue_ctx, conn->vsub->imsi);
-}
-
-static int iu_rab_act_cs(struct ranap_ue_conn_ctx *uectx, uint8_t rab_id,
- uint32_t rtp_ip, uint16_t rtp_port)
-{
-#ifdef BUILD_IU
- struct msgb *msg;
- bool use_x213_nsap;
- uint32_t conn_id = uectx->conn_id;
-
- use_x213_nsap = (uectx->rab_assign_addr_enc == RANAP_NSAP_ADDR_ENC_X213);
-
- LOGP(DIUCS, LOGL_DEBUG, "Assigning RAB: conn_id=%u, rab_id=%d,"
- " rtp=%x:%u, use_x213_nsap=%d\n", conn_id, rab_id, rtp_ip,
- rtp_port, use_x213_nsap);
-
- msg = ranap_new_msg_rab_assign_voice(rab_id, rtp_ip, rtp_port,
- use_x213_nsap);
- msg->l2h = msg->data;
-
- if (ranap_iu_rab_act(uectx, msg))
- LOGP(DIUCS, LOGL_ERROR, "Failed to send RAB Assignment:"
- " conn_id=%d rab_id=%d rtp=%x:%u\n",
- conn_id, rab_id, rtp_ip, rtp_port);
- return 0;
-#else
- LOGP(DMSC, LOGL_ERROR, "Cannot send Iu RAB Assignment: built without Iu support\n");
- return -ENOTSUP;
-#endif
-}
-
-static void mgcp_response_rab_act_cs_crcx(struct mgcp_response *r, void *priv)
-{
- struct gsm_trans *trans = priv;
- struct gsm_subscriber_connection *conn = trans->conn;
- uint32_t rtp_ip;
- int rc;
-
- if (r->head.response_code != 200) {
- LOGP(DMGCP, LOGL_ERROR,
- "MGCPGW response yields error: %d %s\n",
- r->head.response_code, r->head.comment);
- goto rab_act_cs_error;
- }
-
- rc = mgcp_response_parse_params(r);
- if (rc) {
- LOGP(DMGCP, LOGL_ERROR,
- "Cannot parse MGCP response, for %s\n",
- vlr_subscr_name(trans->vsub));
- goto rab_act_cs_error;
- }
-
- conn->rtp.port_cn = r->audio_port;
-
- rtp_ip = mgcpgw_client_remote_addr_n(conn->network->mgcpgw.client);
-
- if (trans->conn->via_ran == RAN_UTRAN_IU) {
- /* Assign a voice channel via RANAP on 3G */
- if (iu_rab_act_cs(conn->iu.ue_ctx, conn->iu.rab_id, rtp_ip, conn->rtp.port_subscr))
- goto rab_act_cs_error;
- } else if (trans->conn->via_ran == RAN_GERAN_A) {
- /* Assign a voice channel via A on 2G */
- if (a_iface_tx_assignment(trans))
- goto rab_act_cs_error;
- } else
- goto rab_act_cs_error;
-
- /* Respond back to MNCC (if requested) */
- if (trans->tch_rtp_create) {
- if (gsm48_tch_rtp_create(trans))
- goto rab_act_cs_error;
- }
- return;
-
-rab_act_cs_error:
- /* FIXME abort call, invalidate conn, ... */
- LOGP(DMSC, LOGL_ERROR, "%s: failure during assignment\n",
- vlr_subscr_name(trans->vsub));
- return;
-}
-
-int msc_call_assignment(struct gsm_trans *trans)
-{
- struct gsm_subscriber_connection *conn;
- struct mgcpgw_client *mgcp;
- struct msgb *msg;
- uint16_t bts_base;
-
- if (!trans)
- return -EINVAL;
- if (!trans->conn)
- return -EINVAL;
-
- conn = trans->conn;
- mgcp = conn->network->mgcpgw.client;
-
-#ifdef BUILD_IU
- /* FIXME: HACK. where to scope the RAB Id? At the conn / subscriber / ranap_ue_conn_ctx? */
- static uint8_t next_iu_rab_id = 1;
- if (conn->via_ran == RAN_UTRAN_IU)
- conn->iu.rab_id = next_iu_rab_id ++;
-#endif
-
- conn->rtp.mgcp_rtp_endpoint =
- mgcpgw_client_next_endpoint(conn->network->mgcpgw.client);
-
- /* This will calculate the port we assign to the BTS via AoIP
- * assignment command (or rab-assignment on 3G) The BTS will send
- * its RTP traffic to that port on the MGCPGW side. The MGCPGW only
- * gets the endpoint ID via the CRCX. It will do the same calculation
- * on his side too to get knowledge of the rtp port. */
- bts_base = mgcpgw_client_conf_actual(mgcp)->bts_base;
- conn->rtp.port_subscr = bts_base + 2 * conn->rtp.mgcp_rtp_endpoint;
-
- /* Establish the RTP stream first as looping back to the originator.
- * The MDCX will patch through to the counterpart. TODO: play a ring
- * tone instead. */
- msg = mgcp_msg_crcx(mgcp, conn->rtp.mgcp_rtp_endpoint,
- conn->rtp.mgcp_rtp_endpoint, MGCP_CONN_LOOPBACK);
- return mgcpgw_client_tx(mgcp, msg, mgcp_response_rab_act_cs_crcx, trans);
-}
-
-static void mgcp_response_bridge_mdcx(struct mgcp_response *r, void *priv);
-
-static void mgcp_bridge(struct gsm_trans *from, struct gsm_trans *to,
- enum bridge_state state,
- enum mgcp_connection_mode mode)
-{
- struct gsm_subscriber_connection *conn1 = from->conn;
- struct gsm_subscriber_connection *conn2 = to->conn;
- struct mgcpgw_client *mgcp = conn1->network->mgcpgw.client;
- const char *ip;
- struct msgb *msg;
-
- OSMO_ASSERT(mgcp);
-
- from->bridge.peer = to;
- from->bridge.state = state;
-
- /* Loop back to the same MGCP GW */
- ip = mgcpgw_client_remote_addr_str(mgcp);
-
- msg = mgcp_msg_mdcx(mgcp,
- conn1->rtp.mgcp_rtp_endpoint,
- ip, conn2->rtp.port_cn,
- mode);
- if (mgcpgw_client_tx(mgcp, msg, mgcp_response_bridge_mdcx, from))
- LOGP(DMGCP, LOGL_ERROR,
- "Failed to send MDCX message for %s\n",
- vlr_subscr_name(from->vsub));
-}
-
-static void mgcp_response_bridge_mdcx(struct mgcp_response *r, void *priv)
-{
- struct gsm_trans *trans = priv;
- struct gsm_trans *peer = trans->bridge.peer;
-
- switch (trans->bridge.state) {
- case BRIDGE_STATE_LOOPBACK_PENDING:
- trans->bridge.state = BRIDGE_STATE_LOOPBACK_ESTABLISHED;
-
- switch (peer->bridge.state) {
- case BRIDGE_STATE_LOOPBACK_PENDING:
- /* Wait until the other is done as well. */
- return;
- case BRIDGE_STATE_LOOPBACK_ESTABLISHED:
- /* Now that both are in loopback, switch both to
- * forwarding. */
- mgcp_bridge(trans, peer, BRIDGE_STATE_BRIDGE_PENDING,
- MGCP_CONN_RECV_SEND);
- mgcp_bridge(peer, trans, BRIDGE_STATE_BRIDGE_PENDING,
- MGCP_CONN_RECV_SEND);
- break;
- default:
- LOGP(DMGCP, LOGL_ERROR,
- "Unexpected bridge state: %d for %s\n",
- trans->bridge.state, vlr_subscr_name(trans->vsub));
- break;
- }
- break;
-
- case BRIDGE_STATE_BRIDGE_PENDING:
- trans->bridge.state = BRIDGE_STATE_BRIDGE_ESTABLISHED;
- break;
-
- default:
- LOGP(DMGCP, LOGL_ERROR,
- "Unexpected bridge state: %d for %s\n",
- trans->bridge.state, vlr_subscr_name(trans->vsub));
- break;
- }
-}
-
-int msc_call_connect(struct gsm_trans *trans, uint16_t port, uint32_t ip)
-{
- /* With this function we inform the MGCP-GW where (ip/port) it
- * has to send its outgoing voic traffic. The receiving end will
- * usually be a PBX (e.g. Asterisk). The IP-Address we tell, will
- * not only be used to direct the traffic, it will also be used
- * as a filter to make sure only RTP packets from the right
- * remote end will reach the BSS. This is also the reason why
- * inbound audio will not work until this step is performed */
-
- /* NOTE: This function is used when msc_call_bridge(), is not
- * applicable. This is usually the case when an external MNCC
- * is in use */
-
- struct gsm_subscriber_connection *conn;
- struct mgcpgw_client *mgcp;
- struct msgb *msg;
-
- if (!trans)
- return -EINVAL;
- if (!trans->conn)
- return -EINVAL;
- if (!trans->conn->network)
- return -EINVAL;
- if (!trans->conn->network->mgcpgw.client)
- return -EINVAL;
-
- mgcp = trans->conn->network->mgcpgw.client;
-
- struct in_addr ip_addr;
- ip_addr.s_addr = ntohl(ip);
-
- conn = trans->conn;
-
- msg = mgcp_msg_mdcx(mgcp,
- conn->rtp.mgcp_rtp_endpoint,
- inet_ntoa(ip_addr), port, MGCP_CONN_RECV_SEND);
- if (mgcpgw_client_tx(mgcp, msg, NULL, trans))
- LOGP(DMGCP, LOGL_ERROR,
- "Failed to send MDCX message for %s\n",
- vlr_subscr_name(trans->vsub));
-
- return 0;
-}
-
-int msc_call_bridge(struct gsm_trans *trans1, struct gsm_trans *trans2)
-{
- if (!trans1)
- return -EINVAL;
- if (!trans2)
- return -EINVAL;
-
- /* First setup as loopback and configure the counterparts' endpoints,
- * so that when transmission starts the originating addresses are
- * already known to be valid. The mgcp callback will continue. */
- mgcp_bridge(trans1, trans2, BRIDGE_STATE_LOOPBACK_PENDING,
- MGCP_CONN_LOOPBACK);
- mgcp_bridge(trans2, trans1, BRIDGE_STATE_LOOPBACK_PENDING,
- MGCP_CONN_LOOPBACK);
-
- return 0;
-}
-
-void msc_call_release(struct gsm_trans *trans)
-{
- struct msgb *msg;
- struct gsm_subscriber_connection *conn;
- struct mgcpgw_client *mgcp;
-
- if (!trans)
- return;
- if (!trans->conn)
- return;
- if (!trans->conn->network)
- return;
-
- conn = trans->conn;
- mgcp = conn->network->mgcpgw.client;
-
- /* Send DLCX */
- msg = mgcp_msg_dlcx(mgcp, conn->rtp.mgcp_rtp_endpoint,
- conn->rtp.mgcp_rtp_endpoint);
- if (mgcpgw_client_tx(mgcp, msg, NULL, NULL))
- LOGP(DMGCP, LOGL_ERROR,
- "Failed to send DLCX message for %s\n",
- vlr_subscr_name(trans->vsub));
-
- /* Release endpoint id */
- mgcpgw_client_release_endpoint(conn->rtp.mgcp_rtp_endpoint, mgcp);
-}