Neels Hofmeyr | 0e5a7c4 | 2017-05-08 15:12:20 +0200 | [diff] [blame] | 1 | /* Implementation for MSC decisions which interface to send messages out on. */ |
| 2 | |
| 3 | /* (C) 2016 by sysmocom s.m.f.c GmbH <info@sysmocom.de> |
| 4 | * |
| 5 | * All Rights Reserved |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU Affero General Public License as published by |
| 9 | * the Free Software Foundation; either version 3 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU Affero General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Affero General Public License |
| 18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 19 | */ |
| 20 | |
| 21 | #include <osmocom/core/logging.h> |
| 22 | |
| 23 | #include <openbsc/debug.h> |
| 24 | #include <openbsc/gsm_data.h> |
| 25 | #include <openbsc/msc_ifaces.h> |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 26 | #include <openbsc/iu.h> |
| 27 | #include <openbsc/gsm_subscriber.h> |
| 28 | #include <openbsc/transaction.h> |
| 29 | #include <openbsc/mgcp.h> |
| 30 | #include <openbsc/mgcpgw_client.h> |
| 31 | #include <openbsc/vlr.h> |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 32 | #include <openbsc/a_iface.h> |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 33 | |
| 34 | #include "../../bscconfig.h" |
| 35 | |
| 36 | #ifdef BUILD_IU |
| 37 | extern struct msgb *ranap_new_msg_rab_assign_voice(uint8_t rab_id, |
| 38 | uint32_t rtp_ip, |
| 39 | uint16_t rtp_port, |
| 40 | bool use_x213_nsap); |
| 41 | #endif /* BUILD_IU */ |
Neels Hofmeyr | 0e5a7c4 | 2017-05-08 15:12:20 +0200 | [diff] [blame] | 42 | |
| 43 | static int msc_tx(struct gsm_subscriber_connection *conn, struct msgb *msg) |
| 44 | { |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 45 | if (!conn) |
| 46 | return -EINVAL; |
| 47 | if (!msg) |
| 48 | return -EINVAL; |
| 49 | |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 50 | DEBUGP(DMSC, "msc_tx %u bytes to %s via %s\n", |
| 51 | msg->len, vlr_subscr_name(conn->vsub), |
| 52 | ran_type_name(conn->via_ran)); |
Neels Hofmeyr | 0e5a7c4 | 2017-05-08 15:12:20 +0200 | [diff] [blame] | 53 | switch (conn->via_ran) { |
Neels Hofmeyr | 0e5a7c4 | 2017-05-08 15:12:20 +0200 | [diff] [blame] | 54 | case RAN_GERAN_A: |
| 55 | msg->dst = conn; |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 56 | return a_iface_tx_dtap(msg); |
Neels Hofmeyr | 0e5a7c4 | 2017-05-08 15:12:20 +0200 | [diff] [blame] | 57 | |
| 58 | case RAN_UTRAN_IU: |
| 59 | msg->dst = conn->iu.ue_ctx; |
| 60 | return iu_tx(msg, 0); |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 61 | |
Neels Hofmeyr | 0e5a7c4 | 2017-05-08 15:12:20 +0200 | [diff] [blame] | 62 | default: |
| 63 | LOGP(DMSC, LOGL_ERROR, |
| 64 | "msc_tx(): conn->via_ran invalid (%d)\n", |
| 65 | conn->via_ran); |
| 66 | return -1; |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | |
| 71 | int msc_tx_dtap(struct gsm_subscriber_connection *conn, |
| 72 | struct msgb *msg) |
| 73 | { |
| 74 | return msc_tx(conn, msg); |
| 75 | } |
| 76 | |
| 77 | |
| 78 | /* 9.2.5 CM service accept */ |
| 79 | int msc_gsm48_tx_mm_serv_ack(struct gsm_subscriber_connection *conn) |
| 80 | { |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 81 | struct msgb *msg; |
| 82 | struct gsm48_hdr *gh; |
Neels Hofmeyr | 0e5a7c4 | 2017-05-08 15:12:20 +0200 | [diff] [blame] | 83 | |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 84 | if (!conn) |
| 85 | return -EINVAL; |
| 86 | |
| 87 | msg = gsm48_msgb_alloc_name("GSM 04.08 SERV ACC"); |
| 88 | |
| 89 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
Neels Hofmeyr | 0e5a7c4 | 2017-05-08 15:12:20 +0200 | [diff] [blame] | 90 | gh->proto_discr = GSM48_PDISC_MM; |
| 91 | gh->msg_type = GSM48_MT_MM_CM_SERV_ACC; |
| 92 | |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 93 | DEBUGP(DMM, "-> CM SERVICE ACCEPT %s\n", |
| 94 | vlr_subscr_name(conn->vsub)); |
Neels Hofmeyr | 0e5a7c4 | 2017-05-08 15:12:20 +0200 | [diff] [blame] | 95 | |
| 96 | return msc_tx_dtap(conn, msg); |
| 97 | } |
| 98 | |
| 99 | /* 9.2.6 CM service reject */ |
| 100 | int msc_gsm48_tx_mm_serv_rej(struct gsm_subscriber_connection *conn, |
| 101 | enum gsm48_reject_value value) |
| 102 | { |
| 103 | struct msgb *msg; |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 104 | |
| 105 | if (!conn) |
| 106 | return -EINVAL; |
| 107 | |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 108 | conn->received_cm_service_request = false; |
Neels Hofmeyr | 0e5a7c4 | 2017-05-08 15:12:20 +0200 | [diff] [blame] | 109 | |
| 110 | msg = gsm48_create_mm_serv_rej(value); |
| 111 | if (!msg) { |
| 112 | LOGP(DMM, LOGL_ERROR, "Failed to allocate CM Service Reject.\n"); |
| 113 | return -1; |
| 114 | } |
| 115 | |
| 116 | DEBUGP(DMM, "-> CM SERVICE Reject cause: %d\n", value); |
| 117 | |
| 118 | return msc_tx_dtap(conn, msg); |
| 119 | } |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 120 | |
| 121 | int msc_tx_common_id(struct gsm_subscriber_connection *conn) |
| 122 | { |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 123 | if (!conn) |
| 124 | return -EINVAL; |
| 125 | |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 126 | /* Common ID is only sent over IuCS */ |
| 127 | if (conn->via_ran != RAN_UTRAN_IU) { |
| 128 | LOGP(DMM, LOGL_INFO, |
| 129 | "%s: Asked to transmit Common ID, but skipping" |
| 130 | " because this is not on UTRAN\n", |
| 131 | vlr_subscr_name(conn->vsub)); |
| 132 | return 0; |
| 133 | } |
| 134 | |
| 135 | DEBUGP(DIUCS, "%s: tx CommonID %s\n", |
| 136 | vlr_subscr_name(conn->vsub), conn->vsub->imsi); |
| 137 | return iu_tx_common_id(conn->iu.ue_ctx, conn->vsub->imsi); |
| 138 | } |
| 139 | |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 140 | static int iu_rab_act_cs(struct ue_conn_ctx *uectx, uint8_t rab_id, |
| 141 | uint32_t rtp_ip, uint16_t rtp_port) |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 142 | { |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 143 | #ifdef BUILD_IU |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 144 | struct msgb *msg; |
| 145 | bool use_x213_nsap; |
| 146 | uint32_t conn_id = uectx->conn_id; |
| 147 | |
| 148 | use_x213_nsap = (uectx->rab_assign_addr_enc == NSAP_ADDR_ENC_X213); |
| 149 | |
| 150 | LOGP(DIUCS, LOGL_DEBUG, "Assigning RAB: conn_id=%u, rab_id=%d," |
| 151 | " rtp=%x:%u, use_x213_nsap=%d\n", conn_id, rab_id, rtp_ip, |
| 152 | rtp_port, use_x213_nsap); |
| 153 | |
| 154 | msg = ranap_new_msg_rab_assign_voice(rab_id, rtp_ip, rtp_port, |
| 155 | use_x213_nsap); |
| 156 | msg->l2h = msg->data; |
| 157 | |
| 158 | if (iu_rab_act(uectx, msg)) |
| 159 | LOGP(DIUCS, LOGL_ERROR, "Failed to send RAB Assignment:" |
| 160 | " conn_id=%d rab_id=%d rtp=%x:%u\n", |
| 161 | conn_id, rab_id, rtp_ip, rtp_port); |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 162 | return 0; |
| 163 | #else |
| 164 | LOGP(DMSC, LOGL_ERROR, "Cannot send Iu RAB Assignment: built without Iu support\n"); |
| 165 | return -ENOTSUP; |
| 166 | #endif |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 167 | } |
| 168 | |
| 169 | static void mgcp_response_rab_act_cs_crcx(struct mgcp_response *r, void *priv) |
| 170 | { |
| 171 | struct gsm_trans *trans = priv; |
| 172 | struct gsm_subscriber_connection *conn = trans->conn; |
| 173 | struct ue_conn_ctx *uectx = conn->iu.ue_ctx; |
| 174 | uint32_t rtp_ip; |
| 175 | int rc; |
| 176 | |
| 177 | if (r->head.response_code != 200) { |
| 178 | LOGP(DMGCP, LOGL_ERROR, |
| 179 | "MGCPGW response yields error: %d %s\n", |
| 180 | r->head.response_code, r->head.comment); |
| 181 | goto rab_act_cs_error; |
| 182 | } |
| 183 | |
| 184 | rc = mgcp_response_parse_params(r); |
| 185 | if (rc) { |
| 186 | LOGP(DMGCP, LOGL_ERROR, |
| 187 | "Cannot parse MGCP response, for %s\n", |
| 188 | vlr_subscr_name(trans->vsub)); |
| 189 | goto rab_act_cs_error; |
| 190 | } |
| 191 | |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 192 | conn->rtp.port_cn = r->audio_port; |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 193 | |
| 194 | rtp_ip = mgcpgw_client_remote_addr_n(conn->network->mgcpgw.client); |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 195 | |
| 196 | if (trans->conn->via_ran == RAN_UTRAN_IU) { |
| 197 | /* Assign a voice channel via RANAP on 3G */ |
| 198 | if (iu_rab_act_cs(uectx, conn->iu.rab_id, rtp_ip, conn->rtp.port_subscr)) |
| 199 | goto rab_act_cs_error; |
| 200 | } else if (trans->conn->via_ran == RAN_GERAN_A) { |
| 201 | /* Assign a voice channel via A on 2G */ |
| 202 | if (a_iface_tx_assignment(trans)) |
| 203 | goto rab_act_cs_error; |
| 204 | } else |
| 205 | goto rab_act_cs_error; |
| 206 | |
| 207 | /* Respond back to MNCC (if requested) */ |
| 208 | if (trans->tch_rtp_create) { |
| 209 | if (gsm48_tch_rtp_create(trans)) |
| 210 | goto rab_act_cs_error; |
| 211 | } |
| 212 | return; |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 213 | |
| 214 | rab_act_cs_error: |
| 215 | /* FIXME abort call, invalidate conn, ... */ |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 216 | LOGP(DMSC, LOGL_ERROR, "%s: failure during assignment\n", |
| 217 | vlr_subscr_name(trans->vsub)); |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 218 | return; |
| 219 | } |
| 220 | |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 221 | int msc_call_assignment(struct gsm_trans *trans) |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 222 | { |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 223 | struct gsm_subscriber_connection *conn; |
| 224 | struct mgcpgw_client *mgcp; |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 225 | struct msgb *msg; |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 226 | uint16_t bts_base; |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 227 | |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 228 | if (!trans) |
| 229 | return -EINVAL; |
| 230 | if (!trans->conn) |
| 231 | return -EINVAL; |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 232 | |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 233 | conn = trans->conn; |
| 234 | mgcp = conn->network->mgcpgw.client; |
| 235 | |
| 236 | #ifdef BUILD_IU |
| 237 | /* FIXME: HACK. where to scope the RAB Id? At the conn / subscriber / ue_conn_ctx? */ |
| 238 | static uint8_t next_iu_rab_id = 1; |
| 239 | if (conn->via_ran == RAN_UTRAN_IU) |
| 240 | conn->iu.rab_id = next_iu_rab_id ++; |
| 241 | #endif |
| 242 | |
| 243 | conn->rtp.mgcp_rtp_endpoint = |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 244 | mgcpgw_client_next_endpoint(conn->network->mgcpgw.client); |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 245 | |
| 246 | /* This will calculate the port we assign to the BTS via AoIP |
| 247 | * assignment command (or rab-assignment on 3G) The BTS will send |
| 248 | * its RTP traffic to that port on the MGCPGW side. The MGCPGW only |
| 249 | * gets the endpoint ID via the CRCX. It will do the same calculation |
| 250 | * on his side too to get knowledge of the rtp port. */ |
| 251 | bts_base = mgcp->actual.bts_base; |
| 252 | conn->rtp.port_subscr = bts_base + 2 * conn->rtp.mgcp_rtp_endpoint; |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 253 | |
| 254 | /* Establish the RTP stream first as looping back to the originator. |
| 255 | * The MDCX will patch through to the counterpart. TODO: play a ring |
| 256 | * tone instead. */ |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 257 | msg = mgcp_msg_crcx(mgcp, conn->rtp.mgcp_rtp_endpoint, |
| 258 | conn->rtp.mgcp_rtp_endpoint, MGCP_CONN_LOOPBACK); |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 259 | return mgcpgw_client_tx(mgcp, msg, mgcp_response_rab_act_cs_crcx, trans); |
| 260 | } |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 261 | |
| 262 | static void mgcp_response_bridge_mdcx(struct mgcp_response *r, void *priv); |
| 263 | |
| 264 | static void mgcp_bridge(struct gsm_trans *from, struct gsm_trans *to, |
| 265 | enum bridge_state state, |
| 266 | enum mgcp_connection_mode mode) |
| 267 | { |
| 268 | struct gsm_subscriber_connection *conn1 = from->conn; |
| 269 | struct gsm_subscriber_connection *conn2 = to->conn; |
| 270 | struct mgcpgw_client *mgcp = conn1->network->mgcpgw.client; |
| 271 | const char *ip; |
| 272 | struct msgb *msg; |
| 273 | |
| 274 | OSMO_ASSERT(mgcp); |
| 275 | |
| 276 | from->bridge.peer = to; |
| 277 | from->bridge.state = state; |
| 278 | |
| 279 | /* Loop back to the same MGCP GW */ |
| 280 | ip = mgcpgw_client_remote_addr_str(mgcp); |
| 281 | |
| 282 | msg = mgcp_msg_mdcx(mgcp, |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 283 | conn1->rtp.mgcp_rtp_endpoint, |
| 284 | ip, conn2->rtp.port_cn, |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 285 | mode); |
| 286 | if (mgcpgw_client_tx(mgcp, msg, mgcp_response_bridge_mdcx, from)) |
| 287 | LOGP(DMGCP, LOGL_ERROR, |
| 288 | "Failed to send MDCX message for %s\n", |
| 289 | vlr_subscr_name(from->vsub)); |
| 290 | } |
| 291 | |
| 292 | static void mgcp_response_bridge_mdcx(struct mgcp_response *r, void *priv) |
| 293 | { |
| 294 | struct gsm_trans *trans = priv; |
| 295 | struct gsm_trans *peer = trans->bridge.peer; |
| 296 | |
| 297 | switch (trans->bridge.state) { |
| 298 | case BRIDGE_STATE_LOOPBACK_PENDING: |
| 299 | trans->bridge.state = BRIDGE_STATE_LOOPBACK_ESTABLISHED; |
| 300 | |
| 301 | switch (peer->bridge.state) { |
| 302 | case BRIDGE_STATE_LOOPBACK_PENDING: |
| 303 | /* Wait until the other is done as well. */ |
| 304 | return; |
| 305 | case BRIDGE_STATE_LOOPBACK_ESTABLISHED: |
| 306 | /* Now that both are in loopback, switch both to |
| 307 | * forwarding. */ |
| 308 | mgcp_bridge(trans, peer, BRIDGE_STATE_BRIDGE_PENDING, |
| 309 | MGCP_CONN_RECV_SEND); |
| 310 | mgcp_bridge(peer, trans, BRIDGE_STATE_BRIDGE_PENDING, |
| 311 | MGCP_CONN_RECV_SEND); |
| 312 | break; |
| 313 | default: |
| 314 | LOGP(DMGCP, LOGL_ERROR, |
| 315 | "Unexpected bridge state: %d for %s\n", |
| 316 | trans->bridge.state, vlr_subscr_name(trans->vsub)); |
| 317 | break; |
| 318 | } |
| 319 | break; |
| 320 | |
| 321 | case BRIDGE_STATE_BRIDGE_PENDING: |
| 322 | trans->bridge.state = BRIDGE_STATE_BRIDGE_ESTABLISHED; |
| 323 | break; |
| 324 | |
| 325 | default: |
| 326 | LOGP(DMGCP, LOGL_ERROR, |
| 327 | "Unexpected bridge state: %d for %s\n", |
| 328 | trans->bridge.state, vlr_subscr_name(trans->vsub)); |
| 329 | break; |
| 330 | } |
| 331 | } |
| 332 | |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 333 | int msc_call_connect(struct gsm_trans *trans, uint16_t port, uint32_t ip) |
| 334 | { |
| 335 | /* With this function we inform the MGCP-GW where (ip/port) it |
| 336 | * has to send its outgoing voic traffic. The receiving end will |
| 337 | * usually be a PBX (e.g. Asterisk). The IP-Address we tell, will |
| 338 | * not only be used to direct the traffic, it will also be used |
| 339 | * as a filter to make sure only RTP packets from the right |
| 340 | * remote end will reach the BSS. This is also the reason why |
| 341 | * inbound audio will not work until this step is performed */ |
| 342 | |
| 343 | /* NOTE: This function is used when msc_call_bridge(), is not |
| 344 | * applicable. This is usually the case when an external MNCC |
| 345 | * is in use */ |
| 346 | |
| 347 | struct gsm_subscriber_connection *conn; |
| 348 | struct mgcpgw_client *mgcp; |
| 349 | struct msgb *msg; |
| 350 | |
| 351 | if (!trans) |
| 352 | return -EINVAL; |
| 353 | if (!trans->conn) |
| 354 | return -EINVAL; |
| 355 | if (!trans->conn->network) |
| 356 | return -EINVAL; |
| 357 | if (!trans->conn->network->mgcpgw.client) |
| 358 | return -EINVAL; |
| 359 | |
| 360 | mgcp = trans->conn->network->mgcpgw.client; |
| 361 | |
| 362 | struct in_addr ip_addr; |
| 363 | ip_addr.s_addr = ntohl(ip); |
| 364 | |
| 365 | conn = trans->conn; |
| 366 | |
| 367 | msg = mgcp_msg_mdcx(mgcp, |
| 368 | conn->rtp.mgcp_rtp_endpoint, |
| 369 | inet_ntoa(ip_addr), port, MGCP_CONN_RECV_SEND); |
| 370 | if (mgcpgw_client_tx(mgcp, msg, NULL, trans)) |
| 371 | LOGP(DMGCP, LOGL_ERROR, |
| 372 | "Failed to send MDCX message for %s\n", |
| 373 | vlr_subscr_name(trans->vsub)); |
| 374 | |
| 375 | return 0; |
| 376 | } |
| 377 | |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 378 | int msc_call_bridge(struct gsm_trans *trans1, struct gsm_trans *trans2) |
| 379 | { |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 380 | if (!trans1) |
| 381 | return -EINVAL; |
| 382 | if (!trans2) |
| 383 | return -EINVAL; |
| 384 | |
Neels Hofmeyr | a1756f3 | 2016-05-20 21:59:55 +0200 | [diff] [blame] | 385 | /* First setup as loopback and configure the counterparts' endpoints, |
| 386 | * so that when transmission starts the originating addresses are |
| 387 | * already known to be valid. The mgcp callback will continue. */ |
| 388 | mgcp_bridge(trans1, trans2, BRIDGE_STATE_LOOPBACK_PENDING, |
| 389 | MGCP_CONN_LOOPBACK); |
| 390 | mgcp_bridge(trans2, trans1, BRIDGE_STATE_LOOPBACK_PENDING, |
| 391 | MGCP_CONN_LOOPBACK); |
| 392 | |
| 393 | return 0; |
| 394 | } |
Philipp Maier | 4b60d07 | 2017-04-09 12:32:51 +0200 | [diff] [blame^] | 395 | |
| 396 | void msc_call_release(struct gsm_trans *trans) |
| 397 | { |
| 398 | struct msgb *msg; |
| 399 | struct gsm_subscriber_connection *conn; |
| 400 | struct mgcpgw_client *mgcp; |
| 401 | |
| 402 | if (!trans) |
| 403 | return; |
| 404 | if (!trans->conn) |
| 405 | return; |
| 406 | if (!trans->conn->network) |
| 407 | return; |
| 408 | |
| 409 | conn = trans->conn; |
| 410 | mgcp = conn->network->mgcpgw.client; |
| 411 | |
| 412 | /* Send DLCX */ |
| 413 | msg = mgcp_msg_dlcx(mgcp, conn->rtp.mgcp_rtp_endpoint, |
| 414 | conn->rtp.mgcp_rtp_endpoint); |
| 415 | if (mgcpgw_client_tx(mgcp, msg, NULL, NULL)) |
| 416 | LOGP(DMGCP, LOGL_ERROR, |
| 417 | "Failed to send DLCX message for %s\n", |
| 418 | vlr_subscr_name(trans->vsub)); |
| 419 | |
| 420 | /* Release endpoint id */ |
| 421 | mgcpgw_client_release_endpoint(conn->rtp.mgcp_rtp_endpoint, mgcp); |
| 422 | } |