FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp.h

     /*      $NetBSD: tcp.h,v 1.28 2007/12/25 18:33:47 perry Exp $   */
     
     /*
      * Copyright (c) 1982, 1986, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. 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.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
     *
     *      @(#)tcp.h       8.1 (Berkeley) 6/10/93
     */
    
    #ifndef _NETINET_TCP_H_
    #define _NETINET_TCP_H_
    
    #include <sys/featuretest.h>
    
    #if defined(_NETBSD_SOURCE)
    
    typedef u_int32_t tcp_seq;
    /*
     * TCP header.
     * Per RFC 793, September, 1981.
     * Updated by RFC 3168, September, 2001.
     */
    struct tcphdr {
            u_int16_t th_sport;             /* source port */
            u_int16_t th_dport;             /* destination port */
            tcp_seq   th_seq;               /* sequence number */
            tcp_seq   th_ack;               /* acknowledgement number */
    #if BYTE_ORDER == LITTLE_ENDIAN
            /*LINTED non-portable bitfields*/
            u_int8_t  th_x2:4,              /* (unused) */
                      th_off:4;             /* data offset */
    #endif
    #if BYTE_ORDER == BIG_ENDIAN
            /*LINTED non-portable bitfields*/
            u_int8_t  th_off:4,             /* data offset */
                      th_x2:4;              /* (unused) */
    #endif
            u_int8_t  th_flags;
    #define TH_FIN    0x01
    #define TH_SYN    0x02
    #define TH_RST    0x04
    #define TH_PUSH   0x08
    #define TH_ACK    0x10
    #define TH_URG    0x20
    #define TH_ECE    0x40
    #define TH_CWR    0x80
            u_int16_t th_win;                       /* window */
            u_int16_t th_sum;                       /* checksum */
            u_int16_t th_urp;                       /* urgent pointer */
    } __packed;
    
    #define TCPOPT_EOL              0
    #define TCPOPT_NOP              1
    #define TCPOPT_MAXSEG           2
    #define    TCPOLEN_MAXSEG               4
    #define TCPOPT_WINDOW           3
    #define    TCPOLEN_WINDOW               3
    #define TCPOPT_SACK_PERMITTED   4               /* Experimental */
    #define    TCPOLEN_SACK_PERMITTED       2
    #define TCPOPT_SACK             5               /* Experimental */
    #define TCPOPT_TIMESTAMP        8
    #define    TCPOLEN_TIMESTAMP            10
    #define    TCPOLEN_TSTAMP_APPA          (TCPOLEN_TIMESTAMP+2) /* appendix A */
    
    #define TCPOPT_TSTAMP_HDR       \
        (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
    
    #define TCPOPT_SIGNATURE        19              /* Keyed MD5: RFC 2385 */
    #define    TCPOLEN_SIGNATURE            18
    #define    TCPOLEN_SIGLEN               (TCPOLEN_SIGNATURE+2) /* padding */
    
    #define MAX_TCPOPTLEN   40      /* max # bytes that go in options */
    
    /*
     * Default maximum segment size for TCP.
    * This is defined by RFC 1112 Sec 4.2.2.6.
    */
   #define TCP_MSS         536
   
   #define TCP_MINMSS      216
   
   #define TCP_MAXWIN      65535   /* largest value for (unscaled) window */
   
   #define TCP_MAX_WINSHIFT        14      /* maximum window shift */
   
   #define TCP_MAXBURST    4       /* maximum segments in a burst */
   
   #endif /* _NETBSD_SOURCE */
   
   /*
    * User-settable options (used with setsockopt).
    */
   #define TCP_NODELAY     1       /* don't delay send to coalesce packets */
   #define TCP_MAXSEG      2       /* set maximum segment size */
   #define TCP_KEEPIDLE    3
   #ifdef notyet
   #define TCP_NOPUSH      4       /* reserved for FreeBSD compat */
   #endif
   #define TCP_KEEPINTVL   5
   #define TCP_KEEPCNT     6
   #define TCP_KEEPINIT    7
   #ifdef notyet
   #define TCP_NOOPT       8       /* reserved for FreeBSD compat */
   #endif
   #define TCP_MD5SIG      0x10    /* use MD5 digests (RFC2385) */
   #define TCP_CONGCTL     0x20    /* selected congestion control */
   
   #endif /* !_NETINET_TCP_H_ */

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