![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to tcp_seq.h CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Apple Darwin 0.x] / kernel / bsd / netinet|
Return to tcp_seq.h CVS log | Up to [Apple Darwin 0.x] / kernel / bsd / netinet |
1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
26: /*
27: * Copyright (c) 1982, 1986, 1993, 1995
28: * The Regents of the University of California. All rights reserved.
29: *
30: * Redistribution and use in source and binary forms, with or without
31: * modification, are permitted provided that the following conditions
32: * are met:
33: * 1. Redistributions of source code must retain the above copyright
34: * notice, this list of conditions and the following disclaimer.
35: * 2. Redistributions in binary form must reproduce the above copyright
36: * notice, this list of conditions and the following disclaimer in the
37: * documentation and/or other materials provided with the distribution.
38: * 3. All advertising materials mentioning features or use of this software
39: * must display the following acknowledgement:
40: * This product includes software developed by the University of
41: * California, Berkeley and its contributors.
42: * 4. Neither the name of the University nor the names of its contributors
43: * may be used to endorse or promote products derived from this software
44: * without specific prior written permission.
45: *
46: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
47: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
50: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56: * SUCH DAMAGE.
57: *
58: * @(#)tcp_seq.h 8.3 (Berkeley) 6/21/95
59: */
60:
61: /*
62: * TCP sequence numbers are 32 bit integers operated
63: * on with modular arithmetic. These macros can be
64: * used to compare such integers.
65: */
66: #define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
67: #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
68: #define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
69: #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
70:
71: /*
72: * Macros to initialize tcp sequence numbers for
73: * send and receive from initial send and receive
74: * sequence numbers.
75: */
76: #define tcp_rcvseqinit(tp) \
77: (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
78:
79: #define tcp_sendseqinit(tp) \
80: (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = \
81: (tp)->iss
82:
83: #ifdef _KERNEL
84: /*
85: * Increment for tcp_iss each second.
86: * This is designed to increment at the standard 250 KB/s,
87: * but with a random component averaging 128 KB.
88: * We also increment tcp_iss by a quarter of this amount
89: * each time we use the value for a new connection.
90: * If defined, the tcp_random18() macro should produce a
91: * number in the range [0-0x3ffff] that is hard to predict.
92: */
93: #ifndef tcp_random18
94: #define tcp_random18() ((random() >> 14) & 0x3ffff)
95: #endif
96: #define TCP_ISSINCR (122*1024 + tcp_random18())
97:
98: extern tcp_seq tcp_iss; /* tcp initial send seq # */
99: #else
100: #define TCP_ISSINCR (250*1024) /* increment for tcp_iss each second */
101: #endif
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.