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8ae0e4b4 KM |
1 | /* |
2 | * Copyright (c) 1982 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | * | |
6 | * @(#)tcp_seq.h 6.2 (Berkeley) %G% | |
7 | */ | |
5c3c035b BJ |
8 | |
9 | /* | |
10 | * TCP sequence numbers are 32 bit integers operated | |
11 | * on with modular arithmetic. These macros can be | |
12 | * used to compare such integers. | |
13 | */ | |
14 | #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) | |
15 | #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) | |
16 | #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) | |
17 | #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) | |
18 | ||
19 | /* | |
20 | * Macros to initialize tcp sequence numbers for | |
21 | * send and receive from initial send and receive | |
22 | * sequence numbers. | |
23 | */ | |
24 | #define tcp_rcvseqinit(tp) \ | |
25 | (tp)->rcv_nxt = (tp)->irs + 1 | |
26 | ||
27 | #define tcp_sendseqinit(tp) \ | |
28 | (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ | |
29 | (tp)->iss | |
30 | ||
31 | #define TCP_ISSINCR 128 /* increment for tcp_iss each second */ | |
32 | ||
33 | #ifdef KERNEL | |
34 | tcp_seq tcp_iss; /* tcp initial send seq # */ | |
35 | #endif |