projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 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 | * | |
| 875dfa99 | 6 | * @(#)tcp_seq.h 6.4 (Berkeley) %G% |
| 8ae0e4b4 | 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) \ | |
| 678bbab1 | 25 | (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 |
| 5c3c035b BJ |
26 | |
| 27 | #define tcp_sendseqinit(tp) \ | |
| 28 | (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ | |
| 29 | (tp)->iss | |
| 30 | ||
| 875dfa99 | 31 | #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ |
| 5c3c035b BJ |
32 | |
| 33 | #ifdef KERNEL | |
| 34 | tcp_seq tcp_iss; /* tcp initial send seq # */ | |
| 35 | #endif |