47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/*
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* Copyright (c) 1982, 1986 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* @(#)tcp_seq.h 7.3 (Berkeley) 6/29/88
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*/
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/*
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* TCP sequence numbers are 32 bit integers operated
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* on with modular arithmetic. These macros can be
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* used to compare such integers.
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*/
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#define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
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#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
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#define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
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#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
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/*
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* Macros to initialize tcp sequence numbers for
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* send and receive from initial send and receive
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* sequence numbers.
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*/
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#define tcp_rcvseqinit(tp) \
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(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
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#define tcp_sendseqinit(tp) \
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(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
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(tp)->iss
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#define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */
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#ifdef _KERNEL
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tcp_seq tcp_iss; /* tcp initial send seq # */
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#endif
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