| /* |
| * SCCP management code |
| * |
| * (C) 2009, 2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
| * |
| * 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 SCCP_H |
| #define SCCP_H |
| |
| #include <stdlib.h> |
| |
| #include <sys/socket.h> |
| #include <sys/types.h> |
| |
| #include "sccp_types.h" |
| |
| struct msgb; |
| struct sccp_system; |
| |
| enum { |
| SCCP_CONNECTION_STATE_NONE, |
| SCCP_CONNECTION_STATE_REQUEST, |
| SCCP_CONNECTION_STATE_CONFIRM, |
| SCCP_CONNECTION_STATE_ESTABLISHED, |
| SCCP_CONNECTION_STATE_RELEASE, |
| SCCP_CONNECTION_STATE_RELEASE_COMPLETE, |
| SCCP_CONNECTION_STATE_REFUSED, |
| SCCP_CONNECTION_STATE_SETUP_ERROR, |
| }; |
| |
| struct sockaddr_sccp { |
| sa_family_t sccp_family; /* AF_SCCP in the future??? */ |
| u_int8_t sccp_ssn; /* subssystem number for routing */ |
| |
| /* TODO fill in address indicator... if that is ever needed */ |
| |
| /* not sure about these */ |
| /* u_int8_t sccp_class; */ |
| }; |
| |
| /* |
| * parsed structure of an address |
| */ |
| struct sccp_address { |
| struct sccp_called_party_address address; |
| u_int8_t ssn; |
| u_int8_t poi[2]; |
| }; |
| |
| struct sccp_optional_data { |
| u_int8_t data_len; |
| u_int8_t data_start; |
| }; |
| |
| struct sccp_connection { |
| /* public */ |
| void *data_ctx; |
| void (*data_cb)(struct sccp_connection *conn, struct msgb *msg, unsigned int len); |
| |
| void *state_ctx; |
| void (*state_cb)(struct sccp_connection *, int old_state); |
| |
| struct sccp_source_reference source_local_reference; |
| struct sccp_source_reference destination_local_reference; |
| |
| int connection_state; |
| |
| /* private */ |
| /* list of active connections */ |
| struct llist_head list; |
| struct sccp_system *system; |
| int incoming; |
| }; |
| |
| /** |
| * system functionality to implement on top of any other transport layer: |
| * call sccp_system_incoming for incoming data (from the network) |
| * sccp will call outgoing whenever outgoing data exists |
| */ |
| int sccp_system_init(void (*outgoing)(struct msgb *data, void *ctx), void *context); |
| int sccp_system_incoming(struct msgb *data); |
| |
| /** |
| * Send data on an existing connection |
| */ |
| int sccp_connection_write(struct sccp_connection *connection, struct msgb *data); |
| int sccp_connection_send_it(struct sccp_connection *connection); |
| int sccp_connection_close(struct sccp_connection *connection, int cause); |
| int sccp_connection_free(struct sccp_connection *connection); |
| |
| /** |
| * internal.. |
| */ |
| int sccp_connection_force_free(struct sccp_connection *conn); |
| |
| /** |
| * Create a new socket. Set your callbacks and then call bind to open |
| * the connection. |
| */ |
| struct sccp_connection *sccp_connection_socket(void); |
| |
| /** |
| * Open the connection and send additional data |
| */ |
| int sccp_connection_connect(struct sccp_connection *conn, |
| const struct sockaddr_sccp *sccp_called, |
| struct msgb *data); |
| |
| /** |
| * mostly for testing purposes only. Set the accept callback. |
| * TODO: add true routing information... in analogy to socket, bind, accept |
| */ |
| int sccp_connection_set_incoming(const struct sockaddr_sccp *sock, |
| int (*accept_cb)(struct sccp_connection *connection, void *data), |
| void *user_data); |
| |
| /** |
| * Send data in terms of unit data. A fixed address indicator will be used. |
| */ |
| int sccp_write(struct msgb *data, |
| const struct sockaddr_sccp *sock_sender, |
| const struct sockaddr_sccp *sock_target, int class); |
| int sccp_set_read(const struct sockaddr_sccp *sock, |
| int (*read_cb)(struct msgb *msgb, unsigned int, void *user_data), |
| void *user_data); |
| |
| /* generic sock addresses */ |
| extern const struct sockaddr_sccp sccp_ssn_bssap; |
| |
| /* helpers */ |
| u_int32_t sccp_src_ref_to_int(struct sccp_source_reference *ref); |
| struct sccp_source_reference sccp_src_ref_from_int(u_int32_t); |
| |
| struct msgb *sccp_create_refuse(struct sccp_source_reference *src_ref, int cause, uint8_t *data, int length); |
| struct msgb *sccp_create_cc(struct sccp_source_reference *src_ref, struct sccp_source_reference *dst_ref); |
| struct msgb *sccp_create_rlsd(struct sccp_source_reference *src_ref, struct sccp_source_reference *dst_ref, int cause); |
| struct msgb *sccp_create_dt1(struct sccp_source_reference *dst_ref, uint8_t *data, uint8_t len); |
| |
| /** |
| * Below this are helper functions and structs for parsing SCCP messages |
| */ |
| struct sccp_parse_result { |
| struct sccp_address called; |
| struct sccp_address calling; |
| |
| /* point to the msg packet */ |
| struct sccp_source_reference *source_local_reference; |
| struct sccp_source_reference *destination_local_reference; |
| |
| /* data pointer */ |
| int data_len; |
| }; |
| |
| /* |
| * helper functions for the nat code |
| */ |
| int sccp_determine_msg_type(struct msgb *msg); |
| int sccp_parse_header(struct msgb *msg, struct sccp_parse_result *result); |
| |
| #endif |