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 are permitted
   6:  * provided that this notice is preserved and that due credit is given
   7:  * to the University of California at Berkeley. The name of the University
   8:  * may not be used to endorse or promote products derived from this
   9:  * software without specific prior written permission. This software
  10:  * is provided ``as is'' without express or implied warranty.
  11:  *
  12:  *	@(#)tcp_seq.h	7.2 (Berkeley) 12/7/87
  13:  */
  14: 
  15: /*
  16:  * TCP sequence numbers are 32 bit integers operated
  17:  * on with modular arithmetic.  These macros can be
  18:  * used to compare such integers.
  19:  */
  20: #define SEQ_LT(a,b)     ((long)((a)-(b)) < 0)
  21: #define SEQ_LEQ(a,b)    ((long)((a)-(b)) <= 0)
  22: #define SEQ_GT(a,b)     ((long)((a)-(b)) > 0)
  23: #define SEQ_GEQ(a,b)    ((long)((a)-(b)) >= 0)
  24: 
  25: /*
  26:  * Macros to initialize tcp sequence numbers for
  27:  * send and receive from initial send and receive
  28:  * sequence numbers.
  29:  */
  30: #define tcp_rcvseqinit(tp) \
  31:     (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
  32: 
  33: #define tcp_sendseqinit(tp) \
  34:     (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
  35:         (tp)->iss
  36: 
  37: #define TCP_ISSINCR 128     /* increment for tcp_iss each second */
  38: 
  39: #ifdef SUPERVISOR
  40: tcp_seq tcp_iss;        /* tcp initial send seq # */
  41: #endif
Last modified: 1988-04-28
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