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bellardf0cbd3e2004-04-22 00:10:48 +00001/*
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.
aliguori2f5f8992009-01-26 19:37:41 +000013 * 3. Neither the name of the University nor the names of its contributors
bellardf0cbd3e2004-04-22 00:10:48 +000014 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)tcp.h 8.1 (Berkeley) 6/10/93
30 * tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp
31 */
32
33#ifndef _TCP_H_
34#define _TCP_H_
35
Stefan Weilb6dce922010-07-22 22:15:23 +020036typedef uint32_t tcp_seq;
bellardf0cbd3e2004-04-22 00:10:48 +000037
38#define PR_SLOWHZ 2 /* 2 slow timeouts per second (approx) */
39#define PR_FASTHZ 5 /* 5 fast timeouts per second (not important) */
40
bellardf0cbd3e2004-04-22 00:10:48 +000041#define TCP_SNDSPACE 8192
42#define TCP_RCVSPACE 8192
43
44/*
45 * TCP header.
46 * Per RFC 793, September, 1981.
47 */
Paolo Bonzinib7221052012-03-22 01:02:51 +010048#define tcphdr slirp_tcphdr
bellardf0cbd3e2004-04-22 00:10:48 +000049struct tcphdr {
Stefan Weilb6dce922010-07-22 22:15:23 +020050 uint16_t th_sport; /* source port */
51 uint16_t th_dport; /* destination port */
bellardf0cbd3e2004-04-22 00:10:48 +000052 tcp_seq th_seq; /* sequence number */
53 tcp_seq th_ack; /* acknowledgement number */
Juan Quintelae2542fe2009-07-27 16:13:06 +020054#ifdef HOST_WORDS_BIGENDIAN
Jan Kiszka1b930bf2011-08-06 14:23:29 +020055 uint8_t th_off:4, /* data offset */
bellardf0cbd3e2004-04-22 00:10:48 +000056 th_x2:4; /* (unused) */
57#else
Jan Kiszka1b930bf2011-08-06 14:23:29 +020058 uint8_t th_x2:4, /* (unused) */
bellardf0cbd3e2004-04-22 00:10:48 +000059 th_off:4; /* data offset */
60#endif
Stefan Weilb6dce922010-07-22 22:15:23 +020061 uint8_t th_flags;
Stefan Weilb6dce922010-07-22 22:15:23 +020062 uint16_t th_win; /* window */
63 uint16_t th_sum; /* checksum */
64 uint16_t th_urp; /* urgent pointer */
bellardf0cbd3e2004-04-22 00:10:48 +000065};
66
67#include "tcp_var.h"
68
Paolo Bonzinib7221052012-03-22 01:02:51 +010069#ifndef TH_FIN
70#define TH_FIN 0x01
71#define TH_SYN 0x02
72#define TH_RST 0x04
73#define TH_PUSH 0x08
74#define TH_ACK 0x10
75#define TH_URG 0x20
76#endif
77
78#ifndef TCPOPT_EOL
bellardf0cbd3e2004-04-22 00:10:48 +000079#define TCPOPT_EOL 0
80#define TCPOPT_NOP 1
81#define TCPOPT_MAXSEG 2
bellardf0cbd3e2004-04-22 00:10:48 +000082#define TCPOPT_WINDOW 3
bellardf0cbd3e2004-04-22 00:10:48 +000083#define TCPOPT_SACK_PERMITTED 4 /* Experimental */
bellardf0cbd3e2004-04-22 00:10:48 +000084#define TCPOPT_SACK 5 /* Experimental */
85#define TCPOPT_TIMESTAMP 8
bellardf0cbd3e2004-04-22 00:10:48 +000086
87#define TCPOPT_TSTAMP_HDR \
88 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
Paolo Bonzinib7221052012-03-22 01:02:51 +010089#endif
bellardf0cbd3e2004-04-22 00:10:48 +000090
Andreas Färbere20e48a2012-04-28 00:29:05 +020091#ifndef TCPOLEN_MAXSEG
92#define TCPOLEN_MAXSEG 4
93#define TCPOLEN_WINDOW 3
94#define TCPOLEN_SACK_PERMITTED 2
95#define TCPOLEN_TIMESTAMP 10
96#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
97#endif
98
bellardf0cbd3e2004-04-22 00:10:48 +000099/*
100 * Default maximum segment size for TCP.
101 * With an IP MSS of 576, this is 536,
102 * but 512 is probably more convenient.
103 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
bellard773f2cd2006-05-01 11:17:27 +0000104 *
105 * We make this 1460 because we only care about Ethernet in the qemu context.
bellardf0cbd3e2004-04-22 00:10:48 +0000106 */
Paolo Bonzinib7221052012-03-22 01:02:51 +0100107#undef TCP_MSS
bellard773f2cd2006-05-01 11:17:27 +0000108#define TCP_MSS 1460
bellardf0cbd3e2004-04-22 00:10:48 +0000109
Paolo Bonzinib7221052012-03-22 01:02:51 +0100110#undef TCP_MAXWIN
bellardf0cbd3e2004-04-22 00:10:48 +0000111#define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
112
Paolo Bonzinib7221052012-03-22 01:02:51 +0100113#undef TCP_MAX_WINSHIFT
bellardf0cbd3e2004-04-22 00:10:48 +0000114#define TCP_MAX_WINSHIFT 14 /* maximum window shift */
115
116/*
117 * User-settable options (used with setsockopt).
ths28d657f2006-12-23 00:03:15 +0000118 *
119 * We don't use the system headers on unix because we have conflicting
120 * local structures. We can't avoid the system definitions on Windows,
121 * so we undefine them.
bellardf0cbd3e2004-04-22 00:10:48 +0000122 */
ths28d657f2006-12-23 00:03:15 +0000123#undef TCP_NODELAY
thseaf7e702006-12-21 19:10:59 +0000124#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
ths28d657f2006-12-23 00:03:15 +0000125#undef TCP_MAXSEG
bellardf0cbd3e2004-04-22 00:10:48 +0000126
127/*
128 * TCP FSM state definitions.
129 * Per RFC793, September, 1981.
130 */
131
132#define TCP_NSTATES 11
133
134#define TCPS_CLOSED 0 /* closed */
135#define TCPS_LISTEN 1 /* listening for connection */
136#define TCPS_SYN_SENT 2 /* active, have sent syn */
137#define TCPS_SYN_RECEIVED 3 /* have send and received syn */
138/* states < TCPS_ESTABLISHED are those where connections not established */
139#define TCPS_ESTABLISHED 4 /* established */
140#define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */
141/* states > TCPS_CLOSE_WAIT are those where user has closed */
142#define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */
143#define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */
144#define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */
145/* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
146#define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */
147#define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */
148
149#define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
150#define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
151#define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
152
153/*
154 * TCP sequence numbers are 32 bit integers operated
155 * on with modular arithmetic. These macros can be
156 * used to compare such integers.
157 */
158#define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
159#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
160#define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
161#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
162
163/*
164 * Macros to initialize tcp sequence numbers for
165 * send and receive from initial send and receive
166 * sequence numbers.
167 */
168#define tcp_rcvseqinit(tp) \
169 (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
170
171#define tcp_sendseqinit(tp) \
172 (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss
173
174#define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */
175
bellardf0cbd3e2004-04-22 00:10:48 +0000176#endif