| /* 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/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> |
| |
| #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_config; |
| 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_realloc)(struct mgcp_trunk_config *cfg, int endpoint); |
| typedef int (*mgcp_change)(struct mgcp_trunk_config *cfg, int endpoint, int state); |
| typedef int (*mgcp_policy)(struct mgcp_trunk_config *cfg, int endpoint, int state, const char *transactio_id); |
| typedef int (*mgcp_reset)(struct mgcp_trunk_config *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 { |
| /* addr or NULL to fall-back to default */ |
| char *bind_addr; |
| |
| /* 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 |
| |
| /* Global MCGP general rate counters */ |
| enum { |
| MGCP_GENERAL_RX_MSGS_TOTAL, |
| MGCP_GENERAL_RX_MSGS_RETRANSMITTED, |
| MGCP_GENERAL_RX_MSGS_HANDLED, |
| MGCP_GENERAL_RX_MSGS_UNHANDLED, |
| MGCP_GENERAL_RX_FAIL_MSG_PARSE, |
| MGCP_GENERAL_RX_FAIL_NO_ENDPOINT, |
| }; |
| |
| /* Global MCGP CRCX related rate counters */ |
| enum { |
| MGCP_CRCX_SUCCESS, |
| MGCP_CRCX_FAIL_BAD_ACTION, |
| MGCP_CRCX_FAIL_UNHANDLED_PARAM, |
| MGCP_CRCX_FAIL_MISSING_CALLID, |
| MGCP_CRCX_FAIL_INVALID_MODE, |
| MGCP_CRCX_FAIL_LIMIT_EXCEEDED, |
| MGCP_CRCX_FAIL_UNKNOWN_CALLID, |
| MGCP_CRCX_FAIL_ALLOC_CONN, |
| MGCP_CRCX_FAIL_NO_REMOTE_CONN_DESC, |
| MGCP_CRCX_FAIL_START_RTP, |
| MGCP_CRCX_FAIL_REJECTED_BY_POLICY, |
| MGCP_CRCX_FAIL_NO_OSMUX, |
| MGCP_CRCX_FAIL_INVALID_CONN_OPTIONS, |
| MGCP_CRCX_FAIL_CODEC_NEGOTIATION, |
| MGCP_CRCX_FAIL_BIND_PORT, |
| }; |
| |
| /* Global MCGP MDCX related rate counters */ |
| enum { |
| MGCP_MDCX_SUCCESS, |
| MGCP_MDCX_FAIL_WILDCARD, |
| MGCP_MDCX_FAIL_NO_CONN, |
| MGCP_MDCX_FAIL_INVALID_CALLID, |
| MGCP_MDCX_FAIL_INVALID_CONNID, |
| MGCP_MDCX_FAIL_UNHANDLED_PARAM, |
| MGCP_MDCX_FAIL_NO_CONNID, |
| MGCP_MDCX_FAIL_CONN_NOT_FOUND, |
| MGCP_MDCX_FAIL_INVALID_MODE, |
| MGCP_MDCX_FAIL_INVALID_CONN_OPTIONS, |
| MGCP_MDCX_FAIL_NO_REMOTE_CONN_DESC, |
| MGCP_MDCX_FAIL_START_RTP, |
| MGCP_MDCX_FAIL_REJECTED_BY_POLICY, |
| MGCP_MDCX_DEFERRED_BY_POLICY |
| }; |
| |
| /* Global MCGP DLCX related rate counters */ |
| enum { |
| MGCP_DLCX_SUCCESS, |
| MGCP_DLCX_FAIL_WILDCARD, |
| MGCP_DLCX_FAIL_NO_CONN, |
| MGCP_DLCX_FAIL_INVALID_CALLID, |
| MGCP_DLCX_FAIL_INVALID_CONNID, |
| MGCP_DLCX_FAIL_UNHANDLED_PARAM, |
| MGCP_DLCX_FAIL_REJECTED_BY_POLICY, |
| MGCP_DLCX_DEFERRED_BY_POLICY, |
| }; |
| |
| struct mgcp_trunk_config { |
| struct llist_head entry; |
| |
| struct mgcp_config *cfg; |
| |
| int trunk_nr; |
| int trunk_type; |
| |
| char *audio_fmtp_extra; |
| char *audio_name; |
| int audio_payload; |
| int audio_send_ptime; |
| int audio_send_name; |
| int audio_loop; |
| |
| int no_audio_transcoding; |
| |
| int omit_rtcp; |
| int keepalive_interval; |
| |
| /* RTP patching */ |
| int force_constant_ssrc; /* 0: don't, 1: once */ |
| int force_aligned_timing; |
| bool rfc5993_hr_convert; |
| |
| /* spec handling */ |
| int force_realloc; |
| |
| /* timer */ |
| struct osmo_timer_list keepalive_timer; |
| |
| /* When set, incoming RTP packets are not filtered |
| * when ports and ip-address do not match (debug) */ |
| int rtp_accept_all; |
| |
| unsigned int number_endpoints; |
| int vty_number_endpoints; |
| struct mgcp_endpoint *endpoints; |
| |
| /* Rate counter group which contains stats for generic MGCP events. */ |
| struct rate_ctr_group *mgcp_general_ctr_group; |
| /* Rate counter group which contains stats for processed CRCX commands. */ |
| struct rate_ctr_group *mgcp_crcx_ctr_group; |
| /* Rate counter group which contains stats for processed MDCX commands. */ |
| struct rate_ctr_group *mgcp_mdcx_ctr_group; |
| /* Rate counter group which contains stats for processed DLCX commands. */ |
| struct rate_ctr_group *mgcp_dlcx_ctr_group; |
| /* Rate counter group which aggregates stats of individual RTP connections. */ |
| struct rate_ctr_group *all_rtp_conn_stats; |
| }; |
| |
| enum mgcp_role { |
| MGCP_BSC = 0, |
| MGCP_BSC_NAT, |
| }; |
| |
| struct mgcp_config { |
| int source_port; |
| char *local_ip; |
| char *source_addr; |
| char *call_agent_addr; |
| |
| /* 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 force_ptime; |
| |
| mgcp_change change_cb; |
| mgcp_policy policy_cb; |
| mgcp_reset reset_cb; |
| mgcp_realloc realloc_cb; |
| mgcp_rqnt rqnt_cb; |
| void *data; |
| |
| uint32_t last_call_id; |
| |
| /* trunk handling */ |
| struct mgcp_trunk_config trunk; |
| 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; |
| /* 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; |
| }; |
| |
| /* 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); |
| int mgcp_endpoints_allocate(struct mgcp_trunk_config *cfg); |
| void mgcp_trunk_set_keepalive(struct mgcp_trunk_config *tcfg, 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 endpoint); |
| int mgcp_send_reset_all(struct mgcp_config *cfg); |
| |
| |
| int mgcp_create_bind(const char *source_addr, struct osmo_fd *fd, int port); |
| int mgcp_udp_send(int fd, struct in_addr *addr, int port, char *buf, int len); |