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Annotation of 43BSDReno/sys/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 is only permitted until one year after the first shipment
                      6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
                      7:  * binary forms are permitted provided that: (1) source distributions retain
                      8:  * this entire copyright notice and comment, and (2) distributions including
                      9:  * binaries display the following acknowledgement:  This product includes
                     10:  * software developed by the University of California, Berkeley and its
                     11:  * contributors'' in the documentation or other materials provided with the
                     12:  * distribution and in all advertising materials mentioning features or use
                     13:  * of this software.  Neither the name of the University nor the names of
                     14:  * its contributors may be used to endorse or promote products derived from
                     15:  * this software without specific prior written permission.
                     16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     19:  *
                     20:  *     @(#)tcp_seq.h   7.4 (Berkeley) 6/28/90
                     21:  */
                     22: 
                     23: /*
                     24:  * TCP sequence numbers are 32 bit integers operated
                     25:  * on with modular arithmetic.  These macros can be
                     26:  * used to compare such integers.
                     27:  */
                     28: #define        SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
                     29: #define        SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
                     30: #define        SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
                     31: #define        SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
                     32: 
                     33: /*
                     34:  * Macros to initialize tcp sequence numbers for
                     35:  * send and receive from initial send and receive
                     36:  * sequence numbers.
                     37:  */
                     38: #define        tcp_rcvseqinit(tp) \
                     39:        (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
                     40: 
                     41: #define        tcp_sendseqinit(tp) \
                     42:        (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
                     43:            (tp)->iss
                     44: 
                     45: #define        TCP_ISSINCR     (125*1024)      /* increment for tcp_iss each second */
                     46: 
                     47: #ifdef KERNEL
                     48: tcp_seq        tcp_iss;                /* tcp initial send seq # */
                     49: #endif

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