1 /* 2 * Copyright (c) 1982, 1986 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 7 #ifndef _NETINET_TCP_SEQ_H 8 #define _NETINET_TCP_SEQ_H 9 10 #pragma ident "%Z%%M% %I% %E% SMI" 11 /* tcp_seq.h 1.7 88/08/19 SMI; from UCB 7.1 6/5/85 */ 12 13 #ifdef __cplusplus 14 extern "C" { 15 #endif 16 17 /* 18 * TCP sequence numbers are 32 bit integers operated 19 * on with modular arithmetic. These macros can be 20 * used to compare such integers. 21 */ 22 #define SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0) 23 #define SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0) 24 #define SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0) 25 #define SEQ_GEQ(a, b) ((int32_t)((a)-(b)) >= 0) 26 27 /* 28 * Macros to initialize tcp sequence numbers for 29 * send and receive from initial send and receive 30 * sequence numbers. 31 */ 32 #define tcp_rcvseqinit(tp) \ 33 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 34 35 #define tcp_sendseqinit(tp) \ 36 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ 37 (tp)->iss 38 39 #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ 40 41 #ifdef __cplusplus 42 } 43 #endif 44 45 #endif /* _NETINET_TCP_SEQ_H */ 46