source: mainline/uspace/srv/net/tl/tcp/tcp_type.h@ 004a5fe

/*
 * Copyright (c) 2011 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup tcp
 * @{
 */
/** @file TCP type definitions
 */

#ifndef TCP_TYPE_H
#define TCP_TYPE_H

#include <adt/list.h>
#include <bool.h>
#include <fibril_synch.h>
#include <sys/types.h>

struct tcp_conn;

typedef enum {
        /** Listen */
        st_listen,
        /** Syn-sent */
        st_syn_sent,
        /** Syn-received */
        st_syn_received,
        /** Established */
        st_established,
        /** Fin-wait-1 */
        st_fin_wait_1,
        /** Fin-wait-2 */
        st_fin_wait_2,
        /** Close-wait */
        st_close_wait,
        /** Closing */
        st_closing,
        /** Last-ack */
        st_last_ack,
        /** Time-wait */
        st_time_wait,
        /** Closed */
        st_closed
} tcp_cstate_t;

/** Error codes returned by TCP user calls (per the spec). */
typedef enum {
        /* OK */
        TCP_EOK,
        /* Connection aborted due to user timeout */
        TCP_EABORTED,
        /* Connection already exists */
        TCP_EEXISTS,
        /* Connection closing */
        TCP_ECLOSING,
        /* Connection does not exist */
        TCP_ENOTEXIST,
        /* Connection illegal for this process */
        TCP_EILLEGAL,
        /* Connection not open */
        TCP_ENOTOPEN,
        /* Connection reset */
        TCP_ERESET,
        /* Foreign socket unspecified */
        TCP_EUNSPEC,
        /* Insufficient resources */
        TCP_ENORES,
        /* Precedence not allowed */
        TCP_EINVPREC,
        /* Security/compartment not allowed */
        TCP_EINVCOMP
} tcp_error_t;

typedef enum {
        XF_PUSH         = 0x1,
        XF_URGENT       = 0x2
} xflags_t;

typedef enum {
        CTL_SYN         = 0x1,
        CTL_FIN         = 0x2,
        CTL_RST         = 0x4,
        CTL_ACK         = 0x8
} tcp_control_t;

typedef struct {
        uint32_t ipv4;
} netaddr_t;

typedef struct {
        netaddr_t addr;
        uint16_t port;
} tcp_sock_t;

typedef struct {
        tcp_sock_t local;
        tcp_sock_t foreign;
} tcp_sockpair_t;

/** Connection incoming segments queue */
typedef struct {
        struct tcp_conn *conn;
        list_t list;
} tcp_iqueue_t;

/** Retransmission queue */
typedef struct {
        struct tcp_conn *conn;
        list_t list;

        /** Retransmission timer */
        fibril_timer_t *timer;
} tcp_tqueue_t;

typedef struct tcp_conn {
        char *name;
        link_t link;

        /** Connection identification (local and foreign socket) */
        tcp_sockpair_t ident;

        /** Connection state */
        tcp_cstate_t cstate;
        /** Protects @c cstate */
        fibril_mutex_t cstate_lock;
        /** Signalled when @c cstate changes */
        fibril_condvar_t cstate_cv;

        /** Set when FIN is removed from the retransmission queue */
        bool fin_is_acked;

        /** Queue of incoming segments */
        tcp_iqueue_t incoming;

        /** Retransmission queue */
        tcp_tqueue_t retransmit;

        /** Time-Wait timeout timer */
        fibril_timer_t *tw_timer;

        /** Receive buffer */
        uint8_t *rcv_buf;
        /** Receive buffer size */
        size_t rcv_buf_size;
        /** Receive buffer number of bytes used */
        size_t rcv_buf_used;
        /** Receive buffer contains FIN */
        bool rcv_buf_fin;
        /** Receive buffer lock */
        fibril_mutex_t rcv_buf_lock;
        /** Receive buffer CV. Broadcast when new data is inserted */
        fibril_condvar_t rcv_buf_cv;

        /** Send buffer */
        uint8_t *snd_buf;
        /** Send buffer size */
        size_t snd_buf_size;
        /** Send buffer number of bytes used */
        size_t snd_buf_used;
        /** Send buffer contains FIN */
        bool snd_buf_fin;

        /** Send unacknowledged */
        uint32_t snd_una;
        /** Send next */
        uint32_t snd_nxt;
        /** Send window */
        uint32_t snd_wnd;
        /** Send urgent pointer */
        uint32_t snd_up;
        /** Segment sequence number used for last window update */
        uint32_t snd_wl1;
        /** Segment acknowledgement number used for last window update */
        uint32_t snd_wl2;
        /** Initial send sequence number */
        uint32_t iss;

        /** Receive next */
        uint32_t rcv_nxt;
        /** Receive window */
        uint32_t rcv_wnd;
        /** Receive urgent pointer */
        uint32_t rcv_up;
        /** Initial receive sequence number */
        uint32_t irs;
} tcp_conn_t;

typedef struct {
        unsigned dummy;
} tcp_conn_status_t;

typedef struct {
        /** SYN, FIN */
        tcp_control_t ctrl;

        /** Segment sequence number */
        uint32_t seq;
        /** Segment acknowledgement number */
        uint32_t ack;
        /** Segment length in sequence space */
        uint32_t len;
        /** Segment window */
        uint32_t wnd;
        /** Segment urgent pointer */
        uint32_t up;

        /** Segment data, may be moved when trimming segment */
        void *data;
        /** Segment data, original pointer used to free data */
        void *dfptr;
} tcp_segment_t;

typedef enum {
        ap_active,
        ap_passive
} acpass_t;

typedef struct {
        link_t link;
        tcp_sockpair_t sp;
        tcp_segment_t *seg;
} tcp_rqueue_entry_t;

/** NCSim queue entry */
typedef struct {
        link_t link;
        suseconds_t delay;
        tcp_sockpair_t sp;
        tcp_segment_t *seg;
} tcp_squeue_entry_t;

typedef struct {
        link_t link;
        tcp_segment_t *seg;
} tcp_iqueue_entry_t;

/** Retransmission queue entry */
typedef struct {
        link_t link;
        tcp_conn_t *conn;
        tcp_segment_t *seg;
} tcp_tqueue_entry_t;

typedef enum {
        cp_continue,
        cp_done
} cproc_t;

#endif

/** @}
 */