VirtualBox

source: vbox/trunk/src/VBox/Devices/Network/slirp/tcp.h@ 22206

最後變更 在這個檔案從22206是 15054,由 vboxsync 提交於 16 年 前

slirp: code readability

  • 屬性 svn:eol-style 設為 native
檔案大小: 6.9 KB
 
1/*
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)tcp.h 8.1 (Berkeley) 6/10/93
34 * tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp
35 */
36
37#ifndef _TCP_H_
38#define _TCP_H_
39
40typedef uint32_t tcp_seq;
41
42#define PR_SLOWHZ 2 /* 2 slow timeouts per second (approx) */
43#define PR_FASTHZ 5 /* 5 fast timeouts per second (not important) */
44
45extern int tcp_rcvspace;
46extern int tcp_sndspace;
47extern struct socket *tcp_last_so;
48
49#define TCP_SNDSPACE 8192
50#define TCP_RCVSPACE 8192
51
52/*
53 * TCP header.
54 * Per RFC 793, September, 1981.
55 */
56struct tcphdr
57{
58 uint16_t th_sport; /* source port */
59 uint16_t th_dport; /* destination port */
60 tcp_seq th_seq; /* sequence number */
61 tcp_seq th_ack; /* acknowledgement number */
62#ifdef WORDS_BIGENDIAN
63# ifdef _MSC_VER
64 uint8_t th_off:4; /* data offset */
65 uint8_t th_x2:4; /* (unused) */
66# else
67 unsigned th_off:4; /* data offset */
68 unsigned th_x2:4; /* (unused) */
69# endif
70#else
71# ifdef _MSC_VER
72 uint8_t th_x2:4; /* (unused) */
73 uint8_t th_off:4; /* data offset */
74# else
75 unsigned th_x2:4; /* (unused) */
76 unsigned th_off:4; /* data offset */
77# endif
78#endif
79 uint8_t th_flags;
80#define TH_FIN 0x01
81#define TH_SYN 0x02
82#define TH_RST 0x04
83#define TH_PUSH 0x08
84#define TH_ACK 0x10
85#define TH_URG 0x20
86 uint16_t th_win; /* window */
87 uint16_t th_sum; /* checksum */
88 uint16_t th_urp; /* urgent pointer */
89};
90AssertCompileSize(struct tcphdr, 20);
91
92#include "tcp_var.h"
93
94#define TCPOPT_EOL 0
95#define TCPOPT_NOP 1
96#define TCPOPT_MAXSEG 2
97#define TCPOLEN_MAXSEG 4
98#define TCPOPT_WINDOW 3
99#define TCPOLEN_WINDOW 3
100#define TCPOPT_SACK_PERMITTED 4 /* Experimental */
101#define TCPOLEN_SACK_PERMITTED 2
102#define TCPOPT_SACK 5 /* Experimental */
103#define TCPOPT_TIMESTAMP 8
104#define TCPOLEN_TIMESTAMP 10
105#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
106
107#define TCPOPT_TSTAMP_HDR \
108 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
109
110/*
111 * Default maximum segment size for TCP.
112 * With an IP MSS of 576, this is 536,
113 * but 512 is probably more convenient.
114 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
115 *
116 * We make this 1460 because we only care about Ethernet in the qemu context.
117 */
118#define TCP_MSS 1460
119
120#define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
121
122#define TCP_MAX_WINSHIFT 14 /* maximum window shift */
123
124/*
125 * User-settable options (used with setsockopt).
126 *
127 * We don't use the system headers on unix because we have conflicting
128 * local structures. We can't avoid the system definitions on Windows,
129 * so we undefine them.
130 */
131#undef TCP_NODELAY
132#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
133#undef TCP_MAXSEG
134/* #define TCP_MAXSEG 0x02 */ /* set maximum segment size */
135
136/*
137 * TCP FSM state definitions.
138 * Per RFC793, September, 1981.
139 */
140
141#define TCP_NSTATES 11
142
143#define TCPS_CLOSED 0 /* closed */
144#define TCPS_LISTEN 1 /* listening for connection */
145#define TCPS_SYN_SENT 2 /* active, have sent syn */
146#define TCPS_SYN_RECEIVED 3 /* have send and received syn */
147/* states < TCPS_ESTABLISHED are those where connections not established */
148#define TCPS_ESTABLISHED 4 /* established */
149#define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */
150/* states > TCPS_CLOSE_WAIT are those where user has closed */
151#define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */
152#define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */
153#define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */
154/* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
155#define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */
156#define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */
157
158#define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
159#define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
160#define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
161
162/*
163 * TCP sequence numbers are 32 bit integers operated on with modular arithmetic.
164 * These macros can be used to compare such integers.
165 */
166#define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
167#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
168#define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
169#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
170
171/*
172 * Macros to initialize tcp sequence numbers for
173 * send and receive from initial send and receive
174 * sequence numbers.
175 */
176#define tcp_rcvseqinit(tp) \
177 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
178
179#define tcp_sendseqinit(tp) \
180 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss
181
182#define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */
183
184
185extern const char * const tcpstates[];
186
187#endif
注意: 瀏覽 TracBrowser 來幫助您使用儲存庫瀏覽器

© 2024 Oracle Support Privacy / Do Not Sell My Info Terms of Use Trademark Policy Automated Access Etiquette