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Annotation of kernel/bsd/netinet/tcp_seq.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
        !            26: /*
        !            27:  * Copyright (c) 1982, 1986, 1993, 1995
        !            28:  *     The Regents of the University of California.  All rights reserved.
        !            29:  *
        !            30:  * Redistribution and use in source and binary forms, with or without
        !            31:  * modification, are permitted provided that the following conditions
        !            32:  * are met:
        !            33:  * 1. Redistributions of source code must retain the above copyright
        !            34:  *    notice, this list of conditions and the following disclaimer.
        !            35:  * 2. Redistributions in binary form must reproduce the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer in the
        !            37:  *    documentation and/or other materials provided with the distribution.
        !            38:  * 3. All advertising materials mentioning features or use of this software
        !            39:  *    must display the following acknowledgement:
        !            40:  *     This product includes software developed by the University of
        !            41:  *     California, Berkeley and its contributors.
        !            42:  * 4. Neither the name of the University nor the names of its contributors
        !            43:  *    may be used to endorse or promote products derived from this software
        !            44:  *    without specific prior written permission.
        !            45:  *
        !            46:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            47:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            48:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            49:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            50:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            51:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            52:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            53:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            54:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            55:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            56:  * SUCH DAMAGE.
        !            57:  *
        !            58:  *     @(#)tcp_seq.h   8.3 (Berkeley) 6/21/95
        !            59:  */
        !            60: 
        !            61: /*
        !            62:  * TCP sequence numbers are 32 bit integers operated
        !            63:  * on with modular arithmetic.  These macros can be
        !            64:  * used to compare such integers.
        !            65:  */
        !            66: #define        SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
        !            67: #define        SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
        !            68: #define        SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
        !            69: #define        SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
        !            70: 
        !            71: /*
        !            72:  * Macros to initialize tcp sequence numbers for
        !            73:  * send and receive from initial send and receive
        !            74:  * sequence numbers.
        !            75:  */
        !            76: #define        tcp_rcvseqinit(tp) \
        !            77:        (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
        !            78: 
        !            79: #define        tcp_sendseqinit(tp) \
        !            80:        (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
        !            81:            (tp)->iss
        !            82: 
        !            83: #ifdef _KERNEL
        !            84: /*
        !            85:  * Increment for tcp_iss each second.
        !            86:  * This is designed to increment at the standard 250 KB/s,
        !            87:  * but with a random component averaging 128 KB.
        !            88:  * We also increment tcp_iss by a quarter of this amount
        !            89:  * each time we use the value for a new connection.
        !            90:  * If defined, the tcp_random18() macro should produce a
        !            91:  * number in the range [0-0x3ffff] that is hard to predict.
        !            92:  */
        !            93: #ifndef tcp_random18
        !            94: #define        tcp_random18()  ((random() >> 14) & 0x3ffff)
        !            95: #endif
        !            96: #define        TCP_ISSINCR     (122*1024 + tcp_random18())
        !            97: 
        !            98: extern tcp_seq tcp_iss;                /* tcp initial send seq # */
        !            99: #else
        !           100: #define        TCP_ISSINCR     (250*1024)      /* increment for tcp_iss each second */
        !           101: #endif

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