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31 * @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95
35 #ifndef _NETINET_TCP_SEQ_H_
36 #define _NETINET_TCP_SEQ_H_
38 * TCP sequence numbers are 32 bit integers operated
39 * on with modular arithmetic. These macros can be
40 * used to compare such integers.
42 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
43 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
44 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
45 #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
47 #define SEQ_MIN(a, b) ((SEQ_LT(a, b)) ? (a) : (b))
48 #define SEQ_MAX(a, b) ((SEQ_GT(a, b)) ? (a) : (b))
50 #define WIN_LT(a,b) (ntohs(a) < ntohs(b))
51 #define WIN_LEQ(a,b) (ntohs(a) <= ntohs(b))
52 #define WIN_GT(a,b) (ntohs(a) > ntohs(b))
53 #define WIN_GEQ(a,b) (ntohs(a) >= ntohs(b))
55 #define WIN_MIN(a, b) ((WIN_LT(a, b)) ? (a) : (b))
56 #define WIN_MAX(a, b) ((WIN_GT(a, b)) ? (a) : (b))
58 /* for modulo comparisons of timestamps */
59 #define TSTMP_LT(a,b) ((int)((a)-(b)) < 0)
60 #define TSTMP_GT(a,b) ((int)((a)-(b)) > 0)
61 #define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0)
64 * Macros to initialize tcp sequence numbers for
65 * send and receive from initial send and receive
68 #define tcp_rcvseqinit(tp) \
69 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
71 #define tcp_sendseqinit(tp) \
72 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
73 (tp)->snd_recover = (tp)->iss
77 * Clock macros for RFC 1323 timestamps.
79 #define TCP_TS_TO_TICKS(_t) ((_t) * hz / 1000)
81 /* Timestamp wrap-around time, 24 days. */
82 #define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * 1000)
85 * tcp_ts_getticks() in ms, should be 1ms < x < 1000ms according to RFC 1323.
86 * We always use 1ms granularity independent of hz.
88 static __inline uint32_t
94 * getmicrouptime() should be good enough for any 1-1000ms granularity.
95 * Do not use getmicrotime() here as it might break nfsroot/tcp.
98 return (tv.tv_sec * 1000 + tv.tv_usec / 1000);
102 #endif /* _NETINET_TCP_SEQ_H_ */