/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef _NETINET_TCP_SEQ_H
#define _NETINET_TCP_SEQ_H

/* tcp_seq.h 1.7 88/08/19 SMI; from UCB 7.1 6/5/85      */

#ifdef  __cplusplus
extern "C" {
#endif

/*
 * TCP sequence numbers are 32 bit integers operated
 * on with modular arithmetic.  These macros can be
 * used to compare such integers.
 */
#define SEQ_LT(a, b)    ((int32_t)((a)-(b)) < 0)
#define SEQ_LEQ(a, b)   ((int32_t)((a)-(b)) <= 0)
#define SEQ_GT(a, b)    ((int32_t)((a)-(b)) > 0)
#define SEQ_GEQ(a, b)   ((int32_t)((a)-(b)) >= 0)

/*
 * Macros to initialize tcp sequence numbers for
 * send and receive from initial send and receive
 * sequence numbers.
 */
#define tcp_rcvseqinit(tp) \
        (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1

#define tcp_sendseqinit(tp) \
        (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
            (tp)->iss

#define TCP_ISSINCR     (125*1024)      /* increment for tcp_iss each second */

#ifdef  __cplusplus
}
#endif

#endif  /* _NETINET_TCP_SEQ_H */