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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [libnetworking/] [netinet/] [tcp_seq.h] - Rev 389
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/* * Copyright (c) 1982, 1986, 1993, 1995 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95 * $Id: tcp_seq.h,v 1.2 2001-09-27 12:01:56 chris Exp $ */ #ifndef _NETINET_TCP_SEQ_H_ #define _NETINET_TCP_SEQ_H_ /* * TCP sequence numbers are 32 bit integers operated * on with modular arithmetic. These macros can be * used to compare such integers. */ #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) /* for modulo comparisons of timestamps */ #define TSTMP_LT(a,b) ((int)((a)-(b)) < 0) #define TSTMP_GEQ(a,b) ((int)((a)-(b)) >= 0) /* * TCP connection counts are 32 bit integers operated * on with modular arithmetic. These macros can be * used to compare such integers. */ #define CC_LT(a,b) ((int)((a)-(b)) < 0) #define CC_LEQ(a,b) ((int)((a)-(b)) <= 0) #define CC_GT(a,b) ((int)((a)-(b)) > 0) #define CC_GEQ(a,b) ((int)((a)-(b)) >= 0) /* Macro to increment a CC: skip 0 which has a special meaning */ #define CC_INC(c) (++(c) == 0 ? ++(c) : (c)) /* * Macros to initialize tcp sequence numbers for * send and receive from initial send and receive * sequence numbers. */ #define tcp_rcvseqinit(tp) \ (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 #define tcp_sendseqinit(tp) \ (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \ (tp)->iss #define TCP_PAWS_IDLE (24 * 24 * 60 * 60 * PR_SLOWHZ) /* timestamp wrap-around time */ #ifdef KERNEL extern tcp_cc tcp_ccgen; /* global connection count */ /* * Increment for tcp_iss each second. * This is designed to increment at the standard 250 KB/s, * but with a random component averaging 128 KB. * We also increment tcp_iss by a quarter of this amount * each time we use the value for a new connection. * If defined, the tcp_random18() macro should produce a * number in the range [0-0x3ffff] that is hard to predict. */ #ifndef tcp_random18 #define tcp_random18() ((random() >> 14) & 0x3ffff) #endif #define TCP_ISSINCR (122*1024 + tcp_random18()) extern tcp_seq tcp_iss; /* tcp initial send seq # */ #else #define TCP_ISSINCR (250*1024) /* increment for tcp_iss each second */ #endif /* KERNEL */ #endif /* _NETINET_TCP_SEQ_H_ */
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