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Annotation of Net2/netinet/tcp_seq.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1982, 1986 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  * 3. All advertising materials mentioning features or use of this software
                     14:  *    must display the following acknowledgement:
                     15:  *     This product includes software developed by the University of
                     16:  *     California, Berkeley and its contributors.
                     17:  * 4. Neither the name of the University nor the names of its contributors
                     18:  *    may be used to endorse or promote products derived from this software
                     19:  *    without specific prior written permission.
                     20:  *
                     21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     31:  * SUCH DAMAGE.
                     32:  *
                     33:  *     @(#)tcp_seq.h   7.4 (Berkeley) 6/28/90
                     34:  */
                     35: 
                     36: /*
                     37:  * TCP sequence numbers are 32 bit integers operated
                     38:  * on with modular arithmetic.  These macros can be
                     39:  * used to compare such integers.
                     40:  */
                     41: #define        SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
                     42: #define        SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
                     43: #define        SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
                     44: #define        SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
                     45: 
                     46: /*
                     47:  * Macros to initialize tcp sequence numbers for
                     48:  * send and receive from initial send and receive
                     49:  * sequence numbers.
                     50:  */
                     51: #define        tcp_rcvseqinit(tp) \
                     52:        (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
                     53: 
                     54: #define        tcp_sendseqinit(tp) \
                     55:        (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
                     56:            (tp)->iss
                     57: 
                     58: #define        TCP_ISSINCR     (125*1024)      /* increment for tcp_iss each second */
                     59: 
                     60: #ifdef KERNEL
                     61: tcp_seq        tcp_iss;                /* tcp initial send seq # */
                     62: #endif

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