source: mainline/uspace/srv/net/tcp/std.h@ d8b47eca

/*
 * 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 header definitions
 *
 * Based on IETF RFC 793
 */

#ifndef STD_H
#define STD_H

#include <sys/types.h>
#include <inet/addr.h>

#define IP_PROTO_TCP  6

/** TCP Header (fixed part) */
typedef struct {
        /** Source port */
        uint16_t src_port;
        /** Destination port */
        uint16_t dest_port;
        /** Sequence number */
        uint32_t seq;
        /** Acknowledgement number */
        uint32_t ack;
        /** Data Offset, Reserved, Flags */
        uint16_t doff_flags;
        /** Window */
        uint16_t window;
        /* Checksum */
        uint16_t checksum;
        /** Urgent pointer */
        uint16_t urg_ptr;
} tcp_header_t;

/** Bits in tcp_header_t.doff_flags */
enum doff_flags_bits {
        DF_DATA_OFFSET_h        = 15,
        DF_DATA_OFFSET_l        = 12,
        DF_URG                  = 5,
        DF_ACK                  = 4,
        DF_PSH                  = 3,
        DF_RST                  = 2,
        DF_SYN                  = 1,
        DF_FIN                  = 0
};

/** TCP IPv4 pseudo header */
typedef struct {
        /** Source address */
        uint32_t src;
        /** Destination address */
        uint32_t dest;
        /** Zero */
        uint8_t zero;
        /** Protocol */
        uint8_t protocol;
        /** TCP length */
        uint16_t tcp_length;
} tcp_phdr_t;

/** TCP IPv6 pseudo header */
typedef struct {
        /** Source address */
        addr128_t src;
        /** Destination address */
        addr128_t dest;
        /** TCP length */
        uint32_t tcp_length;
        /** Zeroes */
        uint8_t zero[3];
        /** Next header */
        uint8_t next;
} tcp_phdr6_t;

/** Option kind */
enum opt_kind {
        /** End of option list */
        OPT_END_LIST            = 0,
        /** No-operation */
        OPT_NOP                 = 1,
        /** Maximum segment size */
        OPT_MAX_SEG_SIZE        = 2
};

#endif

/** @}
 */