123192Smckusick /* 229151Smckusick * Copyright (c) 1982, 1986 Regents of the University of California. 3*32789Sbostic * All rights reserved. 423192Smckusick * 5*32789Sbostic * Redistribution and use in source and binary forms are permitted 6*32789Sbostic * provided that this notice is preserved and that due credit is given 7*32789Sbostic * to the University of California at Berkeley. The name of the University 8*32789Sbostic * may not be used to endorse or promote products derived from this 9*32789Sbostic * software without specific prior written permission. This software 10*32789Sbostic * is provided ``as is'' without express or implied warranty. 11*32789Sbostic * 12*32789Sbostic * @(#)tcp_seq.h 7.2 (Berkeley) 12/07/87 1323192Smckusick */ 145124Swnj 155124Swnj /* 165124Swnj * TCP sequence numbers are 32 bit integers operated 175124Swnj * on with modular arithmetic. These macros can be 185124Swnj * used to compare such integers. 195124Swnj */ 205124Swnj #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) 215124Swnj #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 225124Swnj #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) 235124Swnj #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) 245124Swnj 255124Swnj /* 265124Swnj * Macros to initialize tcp sequence numbers for 275124Swnj * send and receive from initial send and receive 285124Swnj * sequence numbers. 295124Swnj */ 305124Swnj #define tcp_rcvseqinit(tp) \ 3125203Skarels (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 325124Swnj 335124Swnj #define tcp_sendseqinit(tp) \ 345124Swnj (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ 355124Swnj (tp)->iss 365124Swnj 3725204Skarels #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ 385124Swnj 395124Swnj #ifdef KERNEL 405124Swnj tcp_seq tcp_iss; /* tcp initial send seq # */ 415124Swnj #endif 42