source: mainline/uspace/srv/net/tl/tcp/segment.c@ 4c55a64

/*
 * 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
 */

#include <stdlib.h>
#include "segment.h"
#include "seq_no.h"
#include "tcp_type.h"

tcp_segment_t *tcp_segment_new(void)
{
        return calloc(1, sizeof(tcp_segment_t));
}

void tcp_segment_delete(tcp_segment_t *seg)
{
        free(seg);
}

/** Create a control segment. */
tcp_segment_t *tcp_segment_make_ctrl(tcp_control_t ctrl)
{
        tcp_segment_t *seg;

        seg = tcp_segment_new();
        if (seg == NULL)
                return NULL;

        seg->ctrl = ctrl;
        seg->len = seq_no_control_len(ctrl);

        return seg;
}

tcp_segment_t *tcp_segment_make_rst(tcp_segment_t *seg)
{
        tcp_segment_t *rseg;

        rseg = tcp_segment_new();
        if (rseg == NULL)
                return NULL;

        rseg->ctrl = CTL_RST;
        rseg->seq = seg->ack;

        return rseg;
}

size_t tcp_segment_data_len(tcp_segment_t *seg)
{
        return seg->len - seq_no_control_len(seg->ctrl);
}

/**
 * @}
 */