[unix-history] / usr / src / sys / netinet / tcp_seq.h

/*	tcp_seq.h	4.1	81/11/29	*/

/*
 * 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)	((int)((a)-(b)) < 0)
#define	SEQ_LEQ(a,b)	((int)((a)-(b)) <= 0)
#define	SEQ_GT(a,b)	((int)((a)-(b)) > 0)
#define	SEQ_GEQ(a,b)	((int)((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_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	128		/* increment for tcp_iss each second */

#ifdef KERNEL
tcp_seq	tcp_iss;		/* tcp initial send seq # */
#endif
Commit	Line	Data
5c3c035b BJ	1	/* tcp_seq.h 4.1 81/11/29 */
	2
	3	/*
	4	* TCP sequence numbers are 32 bit integers operated
	5	* on with modular arithmetic. These macros can be
	6	* used to compare such integers.
	7	*/
	8	#define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
	9	#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
	10	#define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
	11	#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
	12
	13	/*
	14	* Macros to initialize tcp sequence numbers for
	15	* send and receive from initial send and receive
	16	* sequence numbers.
	17	*/
	18	#define tcp_rcvseqinit(tp) \
	19	(tp)->rcv_nxt = (tp)->irs + 1
	20
	21	#define tcp_sendseqinit(tp) \
	22	(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
	23	(tp)->iss
	24
	25	#define TCP_ISSINCR 128 /* increment for tcp_iss each second */
	26
	27	#ifdef KERNEL
	28	tcp_seq tcp_iss; /* tcp initial send seq # */
	29	#endif