williamr@2: /* TCP_SEQ.H
williamr@2:  * 
williamr@2:  * Portions copyright (c) 1997-1999 Symbian Ltd.  All rights reserved.
williamr@2:  */
williamr@2: 
williamr@2: /*
williamr@2:  * Copyright (c) 1982, 1986 Regents of the University of California.
williamr@2:  * All rights reserved.  The Berkeley software License Agreement
williamr@2:  * specifies the terms and conditions for redistribution.
williamr@2:  */
williamr@2: 
williamr@2: /** @file
williamr@2: @publishedAll
williamr@2: @released
williamr@2: */
williamr@2: 
williamr@2: #ifndef	_NETINET_TCP_SEQ_H
williamr@2: #define	_NETINET_TCP_SEQ_H
williamr@2: 
williamr@2: #ifdef	__cplusplus
williamr@2: extern "C" {
williamr@2: #endif
williamr@2: 
williamr@2: /**
williamr@2: TCP sequence numbers are 32 bit integers operated
williamr@2: on with modular arithmetic.  These macros can be
williamr@2: used to compare such integers.
williamr@2: */
williamr@2: #define	SEQ_LT(a, b)	((int)((a)-(b)) < 0)
williamr@2: #define	SEQ_LEQ(a, b)	((int)((a)-(b)) <= 0)
williamr@2: #define	SEQ_GT(a, b)	((int)((a)-(b)) > 0)
williamr@2: #define	SEQ_GEQ(a, b)	((int)((a)-(b)) >= 0)
williamr@2: 
williamr@2: /**
williamr@2: Macros to initialize tcp sequence numbers for
williamr@2: send and receive from initial send and receive
williamr@2: sequence numbers.
williamr@2: */
williamr@2: #define	tcp_rcvseqinit(tp) \
williamr@2: 	(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
williamr@2: 
williamr@2: #define	tcp_sendseqinit(tp) \
williamr@2: 	(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
williamr@2: 	    (tp)->iss
williamr@2: 
williamr@2: #define	TCP_ISSINCR	(125*1024)	/* increment for tcp_iss each second */
williamr@2: 
williamr@2: #ifdef	__cplusplus
williamr@2: }
williamr@2: #endif
williamr@2: 
williamr@2: #endif	/* _NETINET_TCP_SEQ_H */