1 tcp_seq.h

     1 /* TCP_SEQ.H

     2  * 

     3  * Portions copyright (c) 1997-1999 Symbian Ltd.  All rights reserved.

     4  */

     5 

     6 /*

     7  * Copyright (c) 1982, 1986 Regents of the University of California.

     8  * All rights reserved.  The Berkeley software License Agreement

     9  * specifies the terms and conditions for redistribution.

    10  */

    11 

    12 /** @file

    13 @publishedAll

    14 @released

    15 */

    16 

    17 #ifndef	_NETINET_TCP_SEQ_H

    18 #define	_NETINET_TCP_SEQ_H

    19 

    20 #ifdef	__cplusplus

    21 extern "C" {

    22 #endif

    23 

    24 /**

    25 TCP sequence numbers are 32 bit integers operated

    26 on with modular arithmetic.  These macros can be

    27 used to compare such integers.

    28 */

    29 #define	SEQ_LT(a, b)	((int)((a)-(b)) < 0)

    30 #define	SEQ_LEQ(a, b)	((int)((a)-(b)) <= 0)

    31 #define	SEQ_GT(a, b)	((int)((a)-(b)) > 0)

    32 #define	SEQ_GEQ(a, b)	((int)((a)-(b)) >= 0)

    33 

    34 /**

    35 Macros to initialize tcp sequence numbers for

    36 send and receive from initial send and receive

    37 sequence numbers.

    38 */

    39 #define	tcp_rcvseqinit(tp) \

    40 	(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1

    41 

    42 #define	tcp_sendseqinit(tp) \

    43 	(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \

    44 	    (tp)->iss

    45 

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

    47 

    48 #ifdef	__cplusplus

    49 }

    50 #endif

    51 

    52 #endif	/* _NETINET_TCP_SEQ_H */