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 6.4 (Berkeley) 10/15/85 7 */ 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_adv = (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 (125*1024) /* increment for tcp_iss each second */ 32 33 #ifdef KERNEL 34 tcp_seq tcp_iss; /* tcp initial send seq # */ 35 #endif 36