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33 * @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95
34 * $FreeBSD: src/sys/netinet/tcp_seq.h,v 1.11.2.7 2003/02/03 02:33:10 hsu Exp $
35 * $DragonFly: src/sys/netinet/tcp_seq.h,v 1.2 2003/06/17 04:28:51 dillon Exp $
38 #ifndef _NETINET_TCP_SEQ_H_
39 #define _NETINET_TCP_SEQ_H_
41 * TCP sequence numbers are 32 bit integers operated
42 * on with modular arithmetic. These macros can be
43 * used to compare such integers.
45 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
46 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
47 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
48 #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
50 /* for modulo comparisons of timestamps */
51 #define TSTMP_LT(a,b) ((int)((a)-(b)) < 0)
52 #define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0)
55 * TCP connection counts are 32 bit integers operated
56 * on with modular arithmetic. These macros can be
57 * used to compare such integers.
59 #define CC_LT(a,b) ((int)((a)-(b)) < 0)
60 #define CC_LEQ(a,b) ((int)((a)-(b)) <= 0)
61 #define CC_GT(a,b) ((int)((a)-(b)) > 0)
62 #define CC_GEQ(a,b) ((int)((a)-(b)) >= 0)
64 /* Macro to increment a CC: skip 0 which has a special meaning */
65 #define CC_INC(c) (++(c) == 0 ? ++(c) : (c))
68 * Macros to initialize tcp sequence numbers for
69 * send and receive from initial send and receive
72 #define tcp_rcvseqinit(tp) \
73 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
75 #define tcp_sendseqinit(tp) \
76 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
77 (tp)->snd_recover = (tp)->snd_high = (tp)->iss
79 #define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * hz)
80 /* timestamp wrap-around time */
83 extern tcp_cc tcp_ccgen; /* global connection count */
85 #endif /* _NETINET_TCP_SEQ_H_ */