usr/src/uts/common/netinet/tcp_seq.h

   1 /*
   2  * Copyright (c) 1982, 1986 Regents of the University of California.
   3  * All rights reserved.  The Berkeley software License Agreement
   4  * specifies the terms and conditions for redistribution.
   5  */
   6
   7 #ifndef _NETINET_TCP_SEQ_H
   8 #define _NETINET_TCP_SEQ_H
   9
  10 #pragma ident   "%Z%%M% %I%     %E% SMI"
  11 /* tcp_seq.h 1.7 88/08/19 SMI; from UCB 7.1 6/5/85      */
  12
  13 #ifdef  __cplusplus
  14 extern "C" {
  15 #endif
  16
  17 /*
  18  * TCP sequence numbers are 32 bit integers operated
  19  * on with modular arithmetic.  These macros can be
  20  * used to compare such integers.
  21  */
  22 #define SEQ_LT(a, b)    ((int32_t)((a)-(b)) < 0)
  23 #define SEQ_LEQ(a, b)   ((int32_t)((a)-(b)) <= 0)
  24 #define SEQ_GT(a, b)    ((int32_t)((a)-(b)) > 0)
  25 #define SEQ_GEQ(a, b)   ((int32_t)((a)-(b)) >= 0)
  26
  27 /*
  28  * Macros to initialize tcp sequence numbers for
  29  * send and receive from initial send and receive
  30  * sequence numbers.
  31  */
  32 #define tcp_rcvseqinit(tp) \
  33         (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
  34
  35 #define tcp_sendseqinit(tp) \
  36         (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
  37             (tp)->iss
  38
  39 #define TCP_ISSINCR     (125*1024)      /* increment for tcp_iss each second */
  40
  41 #ifdef  __cplusplus
  42 }
  43 #endif
  44
  45 #endif  /* _NETINET_TCP_SEQ_H */