Commit | Line | Data |
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5c3c035b BJ |
1 | /* tcp_seq.h 4.1 81/11/29 */ |
2 | ||
3 | /* | |
4 | * TCP sequence numbers are 32 bit integers operated | |
5 | * on with modular arithmetic. These macros can be | |
6 | * used to compare such integers. | |
7 | */ | |
8 | #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) | |
9 | #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) | |
10 | #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) | |
11 | #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) | |
12 | ||
13 | /* | |
14 | * Macros to initialize tcp sequence numbers for | |
15 | * send and receive from initial send and receive | |
16 | * sequence numbers. | |
17 | */ | |
18 | #define tcp_rcvseqinit(tp) \ | |
19 | (tp)->rcv_nxt = (tp)->irs + 1 | |
20 | ||
21 | #define tcp_sendseqinit(tp) \ | |
22 | (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ | |
23 | (tp)->iss | |
24 | ||
25 | #define TCP_ISSINCR 128 /* increment for tcp_iss each second */ | |
26 | ||
27 | #ifdef KERNEL | |
28 | tcp_seq tcp_iss; /* tcp initial send seq # */ | |
29 | #endif |