| /* |
| * ipaccess audio handling |
| * |
| * (C) 2009-2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 2009-2010 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_msc_data.h> |
| #include <openbsc/osmo_bsc.h> |
| #include <openbsc/abis_rsl.h> |
| #include <openbsc/gsm_data.h> |
| #include <openbsc/debug.h> |
| #include <openbsc/signal.h> |
| #include <osmocom/gsm/gsm0808.h> |
| #include <osmocom/gsm/gsm0808_utils.h> |
| #include <openbsc/osmo_bsc_sigtran.h> |
| |
| #include <arpa/inet.h> |
| |
| /* Generate and send assignment complete message */ |
| static int send_aoip_ass_compl(struct gsm_subscriber_connection *conn, struct gsm_lchan *lchan) |
| { |
| struct msgb *resp; |
| struct sockaddr_storage rtp_addr; |
| struct sockaddr_in rtp_addr_in; |
| struct gsm0808_speech_codec sc; |
| |
| OSMO_ASSERT(lchan->abis_ip.ass_compl.valid == true); |
| |
| /* Package RTP-Address data */ |
| memset(&rtp_addr_in, 0, sizeof(rtp_addr_in)); |
| rtp_addr_in.sin_family = AF_INET; |
| rtp_addr_in.sin_port = htons(lchan->abis_ip.bound_port); |
| rtp_addr_in.sin_addr.s_addr = htonl(lchan->abis_ip.bound_ip); |
| memset(&rtp_addr, 0, sizeof(rtp_addr)); |
| memcpy(&rtp_addr, &rtp_addr_in, sizeof(rtp_addr_in)); |
| |
| /* Extrapolate speech codec from speech mode */ |
| gsm0808_speech_codec_from_chan_type(&sc, lchan->abis_ip.ass_compl.speech_mode); |
| |
| /* Generate message */ |
| resp = gsm0808_create_ass_compl(lchan->abis_ip.ass_compl.rr_cause, |
| lchan->abis_ip.ass_compl.chosen_channel, |
| lchan->abis_ip.ass_compl.encr_alg_id, |
| lchan->abis_ip.ass_compl.speech_mode, |
| &rtp_addr, |
| &sc, |
| NULL); |
| |
| if (!resp) { |
| LOGP(DMSC, LOGL_ERROR, "Failed to generate assignment completed message!\n"); \ |
| return -EINVAL; |
| } |
| |
| return osmo_bsc_sigtran_send(conn->sccp_con, resp); |
| } |
| |
| static int handle_abisip_signal(unsigned int subsys, unsigned int signal, |
| void *handler_data, void *signal_data) |
| { |
| struct gsm_subscriber_connection *con; |
| struct gsm_lchan *lchan = signal_data; |
| int rc; |
| uint32_t rtp_ip; |
| |
| if (subsys != SS_ABISIP) |
| return 0; |
| |
| con = lchan->conn; |
| if (!con || !con->sccp_con) |
| return 0; |
| |
| switch (signal) { |
| case S_ABISIP_CRCX_ACK: |
| /* |
| * TODO: handle handover here... then the audio should go to |
| * the old mgcp port.. |
| */ |
| |
| /* we can ask it to connect now */ |
| LOGP(DMSC, LOGL_DEBUG, "Connecting BTS to port: %d conn: %d\n", |
| con->sccp_con->rtp_port, lchan->abis_ip.conn_id); |
| |
| /* If AoIP is in use, the rtp_ip, which has been communicated |
| * via the A interface as connect_ip */ |
| if(con->sccp_con->rtp_ip) |
| rtp_ip = con->sccp_con->rtp_ip; |
| else |
| rtp_ip = ntohl(INADDR_ANY); |
| |
| rc = rsl_ipacc_mdcx(lchan, rtp_ip, |
| con->sccp_con->rtp_port, |
| lchan->abis_ip.rtp_payload2); |
| if (rc < 0) { |
| LOGP(DMSC, LOGL_ERROR, "Failed to send MDCX: %d\n", rc); |
| return rc; |
| } |
| break; |
| |
| case S_ABISIP_MDCX_ACK: |
| if (con->ho_lchan) { |
| /* NOTE: When an ho_lchan exists, the MDCX is part of an |
| * handover operation (intra-bsc). This means we will not |
| * inform the MSC about the event, which means that no |
| * assignment complete message is transmitted */ |
| LOGP(DMSC, LOGL_INFO," RTP connection handover complete\n"); |
| } else if (is_ipaccess_bts(con->bts) && con->sccp_con->rtp_ip) { |
| /* NOTE: This is only relevant on AoIP networks with |
| * IPA based base stations. See also osmo_bsc_api.c, |
| * function bsc_assign_compl() */ |
| LOGP(DMSC, LOGL_INFO, "Tx MSC ASSIGN COMPL (POSTPONED)\n"); |
| if (send_aoip_ass_compl(con, lchan) != 0) |
| return -EINVAL; |
| } |
| break; |
| break; |
| } |
| |
| return 0; |
| } |
| |
| int osmo_bsc_audio_init(struct gsm_network *net) |
| { |
| osmo_signal_register_handler(SS_ABISIP, handle_abisip_signal, net); |
| return 0; |
| } |