113 lines
3.6 KiB
C
113 lines
3.6 KiB
C
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/*
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Cubesat Space Protocol - A small network-layer protocol designed for Cubesats
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Copyright (C) 2012 GomSpace ApS (http://www.gomspace.com)
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Copyright (C) 2012 AAUSAT3 Project (http://aausat3.space.aau.dk)
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef _CSP_CONN_H_
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#define _CSP_CONN_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <stdint.h>
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#include <csp/csp.h>
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#include <csp/arch/csp_queue.h>
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#include <csp/arch/csp_semaphore.h>
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/** @brief Connection states */
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typedef enum {
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CONN_CLOSED = 0,
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CONN_OPEN = 1,
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} csp_conn_state_t;
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/** @brief Connection types */
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typedef enum {
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CONN_CLIENT = 0,
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CONN_SERVER = 1,
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} csp_conn_type_t;
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typedef enum {
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RDP_CLOSED = 0,
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RDP_SYN_SENT,
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RDP_SYN_RCVD,
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RDP_OPEN,
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RDP_CLOSE_WAIT,
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} csp_rdp_state_t;
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/** @brief RDP Connection header
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* @note Do not try to pack this struct, the posix sem handle will stop working */
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typedef struct {
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csp_rdp_state_t state; /**< Connection state */
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uint16_t snd_nxt; /**< The sequence number of the next segment that is to be sent */
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uint16_t snd_una; /**< The sequence number of the oldest unacknowledged segment */
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uint16_t snd_iss; /**< The initial send sequence number */
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uint16_t rcv_cur; /**< The sequence number of the last segment received correctly and in sequence */
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uint16_t rcv_irs; /**< The initial receive sequence number */
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uint16_t rcv_lsa; /**< The last sequence number acknowledged by the receiver */
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uint32_t window_size;
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uint32_t conn_timeout;
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uint32_t packet_timeout;
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uint32_t delayed_acks;
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uint32_t ack_timeout;
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uint32_t ack_delay_count;
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uint32_t ack_timestamp;
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csp_bin_sem_handle_t tx_wait;
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csp_queue_handle_t tx_queue;
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csp_queue_handle_t rx_queue;
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} csp_rdp_t;
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/** @brief Connection struct */
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struct csp_conn_s {
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csp_conn_type_t type; /* Connection type (CONN_CLIENT or CONN_SERVER) */
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csp_conn_state_t state; /* Connection state (CONN_OPEN or CONN_CLOSED) */
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csp_mutex_t lock; /* Connection structure lock */
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csp_id_t idin; /* Identifier received */
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csp_id_t idout; /* Identifier transmitted */
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#ifdef CSP_USE_QOS
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csp_queue_handle_t rx_event; /* Event queue for RX packets */
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#endif
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csp_queue_handle_t rx_queue[CSP_RX_QUEUES]; /* Queue for RX packets */
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csp_queue_handle_t socket; /* Socket to be "woken" when first packet is ready */
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uint32_t timestamp; /* Time the connection was opened */
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uint32_t opts; /* Connection or socket options */
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#ifdef CSP_USE_RDP
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csp_rdp_t rdp; /* RDP state */
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#endif
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};
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int csp_conn_lock(csp_conn_t * conn, uint32_t timeout);
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int csp_conn_unlock(csp_conn_t * conn);
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int csp_conn_enqueue_packet(csp_conn_t * conn, csp_packet_t * packet);
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int csp_conn_init(void);
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csp_conn_t * csp_conn_allocate(csp_conn_type_t type);
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csp_conn_t * csp_conn_find(uint32_t id, uint32_t mask);
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csp_conn_t * csp_conn_new(csp_id_t idin, csp_id_t idout);
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void csp_conn_check_timeouts(void);
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int csp_conn_get_rxq(int prio);
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const csp_conn_t * csp_conn_get_array(size_t * size); // for test purposes only!
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif // _CSP_CONN_H_
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