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-rw-r--r--openbsc/src/libmsc/msc_ifaces.c240
1 files changed, 239 insertions, 1 deletions
diff --git a/openbsc/src/libmsc/msc_ifaces.c b/openbsc/src/libmsc/msc_ifaces.c
index 500c99c..1a7d878 100644
--- a/openbsc/src/libmsc/msc_ifaces.c
+++ b/openbsc/src/libmsc/msc_ifaces.c
@@ -23,9 +23,25 @@
#include <openbsc/debug.h>
#include <openbsc/gsm_data.h>
#include <openbsc/msc_ifaces.h>
+#include <openbsc/iu.h>
+#include <openbsc/gsm_subscriber.h>
+#include <openbsc/transaction.h>
+#include <openbsc/mgcp.h>
+#include <openbsc/mgcpgw_client.h>
+#include <openbsc/vlr.h>
+
+#include "../../bscconfig.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);
static int msc_tx(struct gsm_subscriber_connection *conn, struct msgb *msg)
{
+ 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;
@@ -60,7 +76,8 @@ int msc_gsm48_tx_mm_serv_ack(struct gsm_subscriber_connection *conn)
gh->proto_discr = GSM48_PDISC_MM;
gh->msg_type = GSM48_MT_MM_CM_SERV_ACC;
- DEBUGP(DMM, "-> CM SERVICE ACCEPT\n");
+ DEBUGP(DMM, "-> CM SERVICE ACCEPT %s\n",
+ vlr_subscr_name(conn->vsub));
return msc_tx_dtap(conn, msg);
}
@@ -70,6 +87,7 @@ int msc_gsm48_tx_mm_serv_rej(struct gsm_subscriber_connection *conn,
enum gsm48_reject_value value)
{
struct msgb *msg;
+ conn->received_cm_service_request = false;
msg = gsm48_create_mm_serv_rej(value);
if (!msg) {
@@ -81,3 +99,223 @@ int msc_gsm48_tx_mm_serv_rej(struct gsm_subscriber_connection *conn,
return msc_tx_dtap(conn, msg);
}
+
+int msc_tx_common_id(struct gsm_subscriber_connection *conn)
+{
+ /* 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;
+ }
+
+#ifdef BUILD_IU
+ DEBUGP(DIUCS, "%s: tx CommonID %s\n",
+ vlr_subscr_name(conn->vsub), conn->vsub->imsi);
+ return iu_tx_common_id(conn->iu.ue_ctx, conn->vsub->imsi);
+#else
+ LOGP(DMM, LOGL_ERROR,
+ "Cannot send CommonID: RAN_UTRAN_IU but IuCS support not built\n");
+ return -ENOTSUP;
+#endif
+}
+
+#ifdef BUILD_IU
+static void iu_rab_act_cs(struct ue_conn_ctx *uectx, uint8_t rab_id,
+ uint32_t rtp_ip, uint16_t rtp_port)
+{
+ struct msgb *msg;
+ bool use_x213_nsap;
+ uint32_t conn_id = uectx->conn_id;
+
+ use_x213_nsap = (uectx->rab_assign_addr_enc == 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 (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);
+}
+
+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;
+ struct ue_conn_ctx *uectx = conn->iu.ue_ctx;
+ 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->iu.mgcp_rtp_port_cn = r->audio_port;
+
+ rtp_ip = mgcpgw_client_remote_addr_n(conn->network->mgcpgw.client);
+ iu_rab_act_cs(uectx, conn->iu.rab_id, rtp_ip,
+ conn->iu.mgcp_rtp_port_ue);
+ /* use_x213_nsap == 0 for ip.access nano3G */
+
+rab_act_cs_error:
+ /* FIXME abort call, invalidate conn, ... */
+ return;
+}
+
+static int conn_iu_rab_act_cs(struct gsm_trans *trans)
+{
+ struct gsm_subscriber_connection *conn = trans->conn;
+ struct mgcpgw_client *mgcp = conn->network->mgcpgw.client;
+ struct msgb *msg;
+
+ /* HACK. where to scope the RAB Id? At the conn / subscriber /
+ * ue_conn_ctx? */
+ static uint8_t next_rab_id = 1;
+ conn->iu.rab_id = next_rab_id ++;
+
+ conn->iu.mgcp_rtp_endpoint =
+ mgcpgw_client_next_endpoint(conn->network->mgcpgw.client);
+ /* HACK: the addresses should be known from CRCX response
+ * and config. */
+ conn->iu.mgcp_rtp_port_ue = 4000 + 2 * conn->iu.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->iu.mgcp_rtp_endpoint, trans->callref,
+ MGCP_CONN_LOOPBACK);
+ return mgcpgw_client_tx(mgcp, msg, mgcp_response_rab_act_cs_crcx, trans);
+}
+#endif
+
+int msc_call_assignment(struct gsm_trans *trans)
+{
+ struct gsm_subscriber_connection *conn = trans->conn;
+
+ switch (conn->via_ran) {
+ case RAN_GERAN_A:
+ LOGP(DMSC, LOGL_ERROR,
+ "msc_call_assignment(): A-interface BSSMAP Assignment"
+ " Request not yet implemented\n");
+ return -ENOTSUP;
+
+ case RAN_UTRAN_IU:
+#ifdef BUILD_IU
+ return conn_iu_rab_act_cs(trans);
+#else
+ LOGP(DMSC, LOGL_ERROR,
+ "msc_call_assignment(): IuCS RAB Activation not supported"
+ " in this build\n");
+ return -ENOTSUP;
+#endif
+
+ default:
+ LOGP(DMSC, LOGL_ERROR,
+ "msc_tx(): conn->via_ran invalid (%d)\n",
+ conn->via_ran);
+ return -EINVAL;
+ }
+}
+
+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->iu.mgcp_rtp_endpoint,
+ ip, conn2->iu.mgcp_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_bridge(struct gsm_trans *trans1, struct gsm_trans *trans2)
+{
+ /* 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;
+}