| 1 | /*
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| 2 | * Copyright (c) 2011 Jiri Svoboda
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup tcp
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | /**
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| 34 | * @file
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| 35 | */
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| 36 |
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| 37 | #include <stdlib.h>
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| 38 | #include "segment.h"
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| 39 | #include "seq_no.h"
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| 40 | #include "tcp_type.h"
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| 41 |
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| 42 | tcp_segment_t *tcp_segment_new(void)
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| 43 | {
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| 44 | return calloc(1, sizeof(tcp_segment_t));
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| 45 | }
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| 46 |
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| 47 | /** Create a control segment. */
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| 48 | tcp_segment_t *tcp_segment_make_ctrl(tcp_control_t ctrl)
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| 49 | {
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| 50 | tcp_segment_t *seg;
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| 51 |
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| 52 | seg = tcp_segment_new();
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| 53 | if (seg == NULL)
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| 54 | return NULL;
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| 55 |
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| 56 | seg->ctrl = ctrl;
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| 57 | seg->len = seq_no_control_len(ctrl);
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| 58 |
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| 59 | return seg;
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| 60 | }
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| 61 |
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| 62 | tcp_segment_t *tcp_segment_make_rst(tcp_segment_t *seg)
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| 63 | {
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| 64 | tcp_segment_t *rseg;
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| 65 |
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| 66 | rseg = tcp_segment_new();
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| 67 | if (rseg == NULL)
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| 68 | return NULL;
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| 69 |
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| 70 | rseg->ctrl = CTL_RST;
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| 71 | rseg->seq = seg->ack;
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| 72 |
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| 73 | return rseg;
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| 74 | }
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| 75 |
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| 76 | size_t tcp_segment_data_len(tcp_segment_t *seg)
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| 77 | {
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| 78 | return seg->len - seq_no_control_len(seg->ctrl);
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| 79 | }
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| 80 |
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| 81 | /**
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| 82 | * @}
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| 83 | */
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