gnrc_tcp_option.h

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/*
 * Copyright (C) 2015-2017 Simon Brummer
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */
 
#pragma once

 
#include <stdint.h>
#include "assert.h"
#include "net/tcp.h"
#include "net/gnrc/tcp/tcb.h"
 
#ifdef __cplusplus
extern "C" {
#endif

static inline uint32_t _gnrc_tcp_option_build_mss(uint16_t mss)
{
    return (((uint32_t) TCP_OPTION_KIND_MSS << 24) |
            ((uint32_t) TCP_OPTION_LENGTH_MSS << 16) | mss);
}

static inline uint16_t _gnrc_tcp_option_build_offset_control(uint16_t nopts, uint16_t ctl)
{
    assert(TCP_HDR_OFFSET_MIN <= nopts && nopts <= TCP_HDR_OFFSET_MAX);
    return (nopts << 12) | ctl;
}

int _gnrc_tcp_option_parse(gnrc_tcp_tcb_t *tcb, tcp_hdr_t *hdr);
 
#ifdef __cplusplus
}
#endif