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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*
        !            23:  * Copyright (c) 1982, 1986, 1993, 1995
        !            24:  *     The Regents of the University of California.  All rights reserved.
        !            25:  *
        !            26:  * Redistribution and use in source and binary forms, with or without
        !            27:  * modification, are permitted provided that the following conditions
        !            28:  * are met:
        !            29:  * 1. Redistributions of source code must retain the above copyright
        !            30:  *    notice, this list of conditions and the following disclaimer.
        !            31:  * 2. Redistributions in binary form must reproduce the above copyright
        !            32:  *    notice, this list of conditions and the following disclaimer in the
        !            33:  *    documentation and/or other materials provided with the distribution.
        !            34:  * 3. All advertising materials mentioning features or use of this software
        !            35:  *    must display the following acknowledgement:
        !            36:  *     This product includes software developed by the University of
        !            37:  *     California, Berkeley and its contributors.
        !            38:  * 4. Neither the name of the University nor the names of its contributors
        !            39:  *    may be used to endorse or promote products derived from this software
        !            40:  *    without specific prior written permission.
        !            41:  *
        !            42:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            43:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            44:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            45:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            46:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            47:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            48:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            49:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            50:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            51:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            52:  * SUCH DAMAGE.
        !            53:  *
        !            54:  *     @(#)tcp_seq.h   8.3 (Berkeley) 6/21/95
        !            55:  */
        !            56: 
        !            57: #ifndef _NETINET_TCP_SEQ_H_
        !            58: #define _NETINET_TCP_SEQ_H_
        !            59: /*
        !            60:  * TCP sequence numbers are 32 bit integers operated
        !            61:  * on with modular arithmetic.  These macros can be
        !            62:  * used to compare such integers.
        !            63:  */
        !            64: #define        SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
        !            65: #define        SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
        !            66: #define        SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
        !            67: #define        SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
        !            68: 
        !            69: /* for modulo comparisons of timestamps */
        !            70: #define TSTMP_LT(a,b)  ((int)((a)-(b)) < 0)
        !            71: #define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0)
        !            72: 
        !            73: /*
        !            74:  * TCP connection counts are 32 bit integers operated
        !            75:  * on with modular arithmetic.  These macros can be
        !            76:  * used to compare such integers.
        !            77:  */
        !            78: #define        CC_LT(a,b)      ((int)((a)-(b)) < 0)
        !            79: #define        CC_LEQ(a,b)     ((int)((a)-(b)) <= 0)
        !            80: #define        CC_GT(a,b)      ((int)((a)-(b)) > 0)
        !            81: #define        CC_GEQ(a,b)     ((int)((a)-(b)) >= 0)
        !            82: 
        !            83: /* Macro to increment a CC: skip 0 which has a special meaning */
        !            84: #define CC_INC(c)      (++(c) == 0 ? ++(c) : (c))
        !            85: 
        !            86: /*
        !            87:  * Macros to initialize tcp sequence numbers for
        !            88:  * send and receive from initial send and receive
        !            89:  * sequence numbers.
        !            90:  */
        !            91: #define        tcp_rcvseqinit(tp) \
        !            92:        (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
        !            93: 
        !            94: #define        tcp_sendseqinit(tp) \
        !            95:        (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
        !            96:            (tp)->iss
        !            97: 
        !            98: #define TCP_PAWS_IDLE  (24 * 24 * 60 * 60 * PR_SLOWHZ)
        !            99:                                        /* timestamp wrap-around time */
        !           100: 
        !           101: #ifdef KERNEL
        !           102: extern tcp_cc  tcp_ccgen;              /* global connection count */
        !           103: 
        !           104: /*
        !           105:  * Increment for tcp_iss each second.
        !           106:  * This is designed to increment at the standard 250 KB/s,
        !           107:  * but with a random component averaging 128 KB.
        !           108:  * We also increment tcp_iss by a quarter of this amount
        !           109:  * each time we use the value for a new connection.
        !           110:  * If defined, the tcp_random18() macro should produce a
        !           111:  * number in the range [0-0x3ffff] that is hard to predict.
        !           112:  */
        !           113: #ifndef tcp_random18
        !           114: #define        tcp_random18()  ((random() >> 14) & 0x3ffff)
        !           115: #endif
        !           116: #define        TCP_ISSINCR     (122*1024 + tcp_random18())
        !           117: 
        !           118: extern tcp_seq tcp_iss;                /* tcp initial send seq # */
        !           119: #else
        !           120: #define        TCP_ISSINCR     (250*1024)      /* increment for tcp_iss each second */
        !           121: #endif /* KERNEL */
        !           122: #endif /* _NETINET_TCP_SEQ_H_ */

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