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Diffstat (limited to 'openbsc/include/openbsc/mgcp.h')
| -rw-r--r-- | openbsc/include/openbsc/mgcp.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/openbsc/include/openbsc/mgcp.h b/openbsc/include/openbsc/mgcp.h new file mode 100644 index 000000000..f7e800bd8 --- /dev/null +++ b/openbsc/include/openbsc/mgcp.h @@ -0,0 +1,122 @@ +/* A Media Gateway Control Protocol Media Gateway: RFC 3435 */ + +/* + * (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 General Public License as published by + * the Free Software Foundation; either version 2 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#ifndef OPENBSC_MGCP_H +#define OPENBSC_MGCP_H + +#include <osmocore/msgb.h> + +#include <arpa/inet.h> + +#define RTP_PORT_DEFAULT 4000 + +/** + * Calculate the RTP audio port for the given multiplex + * and the direction. This allows a semi static endpoint + * to port calculation removing the need for the BSC + * and the MediaGateway to communicate. + * + * Port usage explained: + * base + (multiplex * 2) + 0 == local port to wait for network packets + * base + (multiplex * 2) + 1 == local port for rtcp + * + * The above port will receive packets from the BTS that need + * to be patched and forwarded to the network. + * The above port will receive packets from the network that + * need to be patched and forwarded to the BTS. + * + * We assume to have a static BTS IP address so we can differentiate + * network and BTS. + * + */ +static inline int rtp_calculate_port(int multiplex, int base) +{ + return base + (multiplex * 2); +} + + +/* + * Handling of MGCP Endpoints and the MGCP Config + */ +struct mgcp_endpoint; +struct mgcp_config; + +#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_change)(struct mgcp_config *cfg, int endpoint, int state, int local_rtp); +typedef int (*mgcp_policy)(struct mgcp_config *cfg, int endpoint, int state, const char *transactio_id); + +struct mgcp_config { + int source_port; + char *local_ip; + char *source_addr; + unsigned int number_endpoints; + char *bts_ip; + + struct in_addr bts_in; + char *audio_name; + int audio_payload; + int audio_loop; + int early_bind; + int rtp_base_port; + + char *forward_ip; + int forward_port; + + mgcp_change change_cb; + mgcp_policy policy_cb; + void *data; + + struct mgcp_endpoint *endpoints; + unsigned int last_call_id; +}; + +/* config management */ +struct mgcp_config *mgcp_config_alloc(void); +int mgcp_parse_config(const char *config_file, struct mgcp_config *cfg); +int mgcp_vty_init(void); +int mgcp_endpoints_allocate(struct mgcp_config *cfg); +int mgcp_bind_rtp_port(struct mgcp_endpoint *endp, int rtp_port); +void mgcp_free_endp(struct mgcp_endpoint *endp); + +/* + * format helper functions + */ +struct msgb *mgcp_handle_message(struct mgcp_config *cfg, struct msgb *msg); +struct msgb *mgcp_create_rsip(void); +struct msgb *mgcp_create_response_with_data(int code, const char *msg, const char *trans, const char *data); + + +#endif |