1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * @(#)tcp_seq.h 7.3 (Berkeley) 06/29/88 18 */ 19 20 /* 21 * TCP sequence numbers are 32 bit integers operated 22 * on with modular arithmetic. These macros can be 23 * used to compare such integers. 24 */ 25 #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) 26 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 27 #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) 28 #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) 29 30 /* 31 * Macros to initialize tcp sequence numbers for 32 * send and receive from initial send and receive 33 * sequence numbers. 34 */ 35 #define tcp_rcvseqinit(tp) \ 36 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 37 38 #define tcp_sendseqinit(tp) \ 39 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ 40 (tp)->iss 41 42 #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ 43 44 #ifdef KERNEL 45 tcp_seq tcp_iss; /* tcp initial send seq # */ 46 #endif 47