| /* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ |
| |
| /* |
| * (C) 2009-2012 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * (C) 2009-2012 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/>. |
| * |
| */ |
| |
| #pragma once |
| |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/core/socket.h> |
| #include <osmocom/core/write_queue.h> |
| #include <osmocom/core/timer.h> |
| #include <osmocom/core/logging.h> |
| |
| #include <osmocom/mgcp/mgcp_common.h> |
| |
| #include <arpa/inet.h> |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <pthread.h> |
| |
| #include "mgcp_ratectr.h" |
| |
| #define RTP_PORT_DEFAULT_RANGE_START 16002 |
| #define RTP_PORT_DEFAULT_RANGE_END RTP_PORT_DEFAULT_RANGE_START + 64 |
| |
| /* |
| * Handling of MGCP Endpoints and the MGCP Config |
| */ |
| struct mgcp_endpoint; |
| struct mgcp_config; |
| struct mgcp_trunk; |
| struct mgcp_rtp_end; |
| |
| #define MGCP_ENDP_CRCX 1 |
| #define MGCP_ENDP_DLCX 2 |
| #define MGCP_ENDP_MDCX 3 |
| |
| /* |
| * what to do with the msg? |
| * - continue as usual? |
| * - reject and send a failure code? |
| * - defer? do not send anything |
| */ |
| #define MGCP_POLICY_CONT 4 |
| #define MGCP_POLICY_REJECT 5 |
| #define MGCP_POLICY_DEFER 6 |
| |
| typedef int (*mgcp_reset)(struct mgcp_trunk *cfg); |
| typedef int (*mgcp_rqnt)(struct mgcp_endpoint *endp, char tone); |
| |
| /** |
| * Return: |
| * < 0 in case no audio was processed |
| * >= 0 in case audio was processed. The remaining payload |
| * length will be returned. |
| */ |
| typedef int (*mgcp_processing)(struct mgcp_endpoint *endp, |
| struct mgcp_rtp_end *dst_end, |
| char *data, int *len, int buf_size); |
| |
| struct mgcp_conn_rtp; |
| |
| typedef int (*mgcp_processing_setup)(struct mgcp_endpoint *endp, |
| struct mgcp_conn_rtp *conn_dst, |
| struct mgcp_conn_rtp *conn_src); |
| |
| struct mgcp_rtp_codec; |
| |
| typedef void (*mgcp_get_format)(struct mgcp_endpoint *endp, |
| const struct mgcp_rtp_codec **codec, |
| const char **fmtp_extra, |
| struct mgcp_conn_rtp *conn); |
| |
| /** |
| * This holds information on how to allocate ports |
| */ |
| struct mgcp_port_range { |
| pthread_mutex_t lock; |
| /* addr or NULL to fall-back to default */ |
| char bind_addr_v4[INET6_ADDRSTRLEN]; |
| char bind_addr_v6[INET6_ADDRSTRLEN]; |
| |
| /* dynamically allocated */ |
| int range_start; |
| int range_end; |
| int last_port; |
| |
| /* set to true to enable automatic probing |
| * of the local bind IP-Address, bind_addr |
| * (or its fall back) is used when automatic |
| * probing fails */ |
| bool bind_addr_probe; |
| }; |
| |
| /* There are up to three modes in which the keep-alive dummy packet can be |
| * sent. The behaviour is controlled via the keepalive_interval member of the |
| * trunk config. If that member is set to 0 (MGCP_KEEPALIVE_NEVER) no dummy- |
| * packet is sent at all and the timer that sends regular dummy packets |
| * is no longer scheduled. If the keepalive_interval is set to -1, only |
| * one dummy packet is sent when an CRCX or an MDCX is performed. No timer |
| * is scheduled. For all vales greater 0, the timer is scheduled and the |
| * value is used as interval. See also mgcp_keepalive_timer_cb(), |
| * handle_modify_con(), and handle_create_con() */ |
| #define MGCP_KEEPALIVE_ONCE (-1) |
| #define MGCP_KEEPALIVE_NEVER 0 |
| |
| enum mgcp_role { |
| MGCP_BSC = 0, |
| MGCP_BSC_NAT, |
| }; |
| |
| struct mgcp_config { |
| int source_port; |
| char local_ip[INET6_ADDRSTRLEN]; |
| char source_addr[INET6_ADDRSTRLEN]; |
| char call_agent_addr[INET6_ADDRSTRLEN]; |
| |
| /* RTP processing */ |
| mgcp_processing rtp_processing_cb; |
| mgcp_processing_setup setup_rtp_processing_cb; |
| |
| mgcp_get_format get_net_downlink_format_cb; |
| |
| struct osmo_wqueue gw_fd; |
| |
| struct mgcp_port_range net_ports; |
| int endp_dscp; |
| int endp_priority; |
| |
| int force_ptime; |
| |
| mgcp_reset reset_cb; |
| mgcp_rqnt rqnt_cb; |
| void *data; |
| |
| /* list holding the trunks */ |
| struct llist_head trunks; |
| |
| enum mgcp_role role; |
| |
| /* osmux translator: 0 means disabled, 1 means enabled */ |
| int osmux; |
| /* addr to bind the server to */ |
| char osmux_addr[INET6_ADDRSTRLEN]; |
| /* The BSC-NAT may ask for enabling osmux on demand. This tells us if |
| * the osmux socket is already initialized. |
| */ |
| int osmux_init; |
| /* osmux batch factor: from 1 to 4 maximum */ |
| int osmux_batch; |
| /* osmux batch size (in bytes) */ |
| int osmux_batch_size; |
| /* osmux port */ |
| uint16_t osmux_port; |
| /* Pad circuit with dummy messages until we see the first voice |
| * message. |
| */ |
| uint16_t osmux_dummy; |
| /* domain name of the media gateway */ |
| char domain[255+1]; |
| |
| /* time after which inactive connections (CIs) get closed */ |
| int conn_timeout; |
| |
| /* osmocom CTRL interface */ |
| struct ctrl_handle *ctrl; |
| |
| /* global rate counters to measure the MGWs overall performance and |
| * health */ |
| struct mgcp_ratectr_global ratectr; |
| }; |
| |
| /* config management */ |
| struct mgcp_config *mgcp_config_alloc(void); |
| int mgcp_parse_config(const char *config_file, struct mgcp_config *cfg, |
| enum mgcp_role role); |
| int mgcp_vty_init(void); |
| void mgcp_trunk_set_keepalive(struct mgcp_trunk *trunk, int interval); |
| |
| /* |
| * format helper functions |
| */ |
| struct msgb *mgcp_handle_message(struct mgcp_config *cfg, struct msgb *msg); |
| |
| |
| int mgcp_send_reset_ep(struct mgcp_endpoint *endp); |
| int mgcp_send_reset_all(struct mgcp_config *cfg); |
| |
| |
| int mgcp_create_bind(const char *source_addr, struct osmo_fd *fd, int port, uint8_t dscp, |
| uint8_t prio); |
| int mgcp_udp_send(int fd, struct osmo_sockaddr *addr, int port, const char *buf, int len); |