src/slirp/tcp.h

/*
 * Copyright (c) 1982, 1986, 1993
 *      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.h       8.1 (Berkeley) 6/10/93
 * tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp
 */

#ifndef _TCP_H_
#define _TCP_H_

typedef u_int32_t       tcp_seq;

#define      PR_SLOWHZ       2               /* 2 slow timeouts per second (approx) */
#define      PR_FASTHZ       5               /* 5 fast timeouts per second (not important) */

extern int tcp_rcvspace;
extern int tcp_sndspace;
extern struct socket *tcp_last_so;

#define TCP_SNDSPACE 8192
#define TCP_RCVSPACE 8192

/*
 * TCP header.
 * Per RFC 793, September, 1981.
 */
#ifdef PRAGMA_PACK_SUPPORTED
#pragma pack(1)
#endif

struct tcphdr {
        u_int16_t       th_sport;               /* source port */
        u_int16_t       th_dport;               /* destination port */
        tcp_seq th_seq;                 /* sequence number */
        tcp_seq th_ack;                 /* acknowledgement number */
#ifdef WORDS_BIGENDIAN
        u_int   th_off:4,               /* data offset */
                th_x2:4;                /* (unused) */
#else
        u_int   th_x2:4,                /* (unused) */
                th_off:4;               /* data offset */
#endif
        u_int8_t        th_flags;
#define TH_FIN  0x01
#define TH_SYN  0x02
#define TH_RST  0x04
#define TH_PUSH 0x08
#define TH_ACK  0x10
#define TH_URG  0x20
        u_int16_t       th_win;                 /* window */
        u_int16_t       th_sum;                 /* checksum */
        u_int16_t       th_urp;                 /* urgent pointer */
} PACKED__;

#ifdef PRAGMA_PACK_SUPPORTED
#pragma pack(0)
#endif

#include "tcp_var.h"

#define TCPOPT_EOL              0
#define TCPOPT_NOP              1
#define TCPOPT_MAXSEG           2
#define    TCPOLEN_MAXSEG               4
#define TCPOPT_WINDOW           3
#define    TCPOLEN_WINDOW               3
#define TCPOPT_SACK_PERMITTED   4               /* Experimental */
#define    TCPOLEN_SACK_PERMITTED       2
#define TCPOPT_SACK             5               /* Experimental */
#define TCPOPT_TIMESTAMP        8
#define    TCPOLEN_TIMESTAMP            10
#define    TCPOLEN_TSTAMP_APPA          (TCPOLEN_TIMESTAMP+2) /* appendix A */

#define TCPOPT_TSTAMP_HDR       \
    (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)

/*
 * Default maximum segment size for TCP.
 * With an IP MSS of 576, this is 536,
 * but 512 is probably more convenient.
 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
 */
#define TCP_MSS 512

#define TCP_MAXWIN      65535   /* largest value for (unscaled) window */

#define TCP_MAX_WINSHIFT        14      /* maximum window shift */

/*
 * User-settable options (used with setsockopt).
 */
/* #define      TCP_NODELAY     0x01 */ /* don't delay send to coalesce packets */
/* #define      TCP_MAXSEG      0x02 */ /* set maximum segment size */

/*
 * TCP FSM state definitions.
 * Per RFC793, September, 1981.
 */

#define TCP_NSTATES     11

#define TCPS_CLOSED             0       /* closed */
#define TCPS_LISTEN             1       /* listening for connection */
#define TCPS_SYN_SENT           2       /* active, have sent syn */
#define TCPS_SYN_RECEIVED       3       /* have send and received syn */
/* states < TCPS_ESTABLISHED are those where connections not established */
#define TCPS_ESTABLISHED        4       /* established */
#define TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */
/* states > TCPS_CLOSE_WAIT are those where user has closed */
#define TCPS_FIN_WAIT_1         6       /* have closed, sent fin */
#define TCPS_CLOSING            7       /* closed xchd FIN; await FIN ACK */
#define TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */
/* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
#define TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */
#define TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */

#define TCPS_HAVERCVDSYN(s)     ((s) >= TCPS_SYN_RECEIVED)
#define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
#define TCPS_HAVERCVDFIN(s)     ((s) >= TCPS_TIME_WAIT)

/*
 * 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)

/*
 * 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_ISSINCR     (125*1024)      /* increment for tcp_iss each second */

extern tcp_seq tcp_iss;                /* tcp initial send seq # */

extern char *tcpstates[];

#endif
Revision:	1.2
Committed:	2006-01-17T21:19:12Z (18 years, 10 months ago) by gbeauche
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+9 -1 lines
Log Message:	Packet headers can be examined through unaligned addresses. This patch fixes this, especially for MIPS & SPARC platforms. [Initial patch from Brian J. Johnson]
#	Content
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
40	typedef u_int32_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
45	extern int tcp_rcvspace;
46	extern int tcp_sndspace;
47	extern 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	*/
56	#ifdef PRAGMA_PACK_SUPPORTED
57	#pragma pack(1)
58	#endif
59
60	struct tcphdr {
61	u_int16_t th_sport; /* source port */
62	u_int16_t th_dport; /* destination port */
63	tcp_seq th_seq; /* sequence number */
64	tcp_seq th_ack; /* acknowledgement number */
65	#ifdef WORDS_BIGENDIAN
66	u_int th_off:4, /* data offset */
67	th_x2:4; /* (unused) */
68	#else
69	u_int th_x2:4, /* (unused) */
70	th_off:4; /* data offset */
71	#endif
72	u_int8_t th_flags;
73	#define TH_FIN 0x01
74	#define TH_SYN 0x02
75	#define TH_RST 0x04
76	#define TH_PUSH 0x08
77	#define TH_ACK 0x10
78	#define TH_URG 0x20
79	u_int16_t th_win; /* window */
80	u_int16_t th_sum; /* checksum */
81	u_int16_t th_urp; /* urgent pointer */
82	} PACKED__;
83
84	#ifdef PRAGMA_PACK_SUPPORTED
85	#pragma pack(0)
86	#endif
87
88	#include "tcp_var.h"
89
90	#define TCPOPT_EOL 0
91	#define TCPOPT_NOP 1
92	#define TCPOPT_MAXSEG 2
93	#define TCPOLEN_MAXSEG 4
94	#define TCPOPT_WINDOW 3
95	#define TCPOLEN_WINDOW 3
96	#define TCPOPT_SACK_PERMITTED 4 /* Experimental */
97	#define TCPOLEN_SACK_PERMITTED 2
98	#define TCPOPT_SACK 5 /* Experimental */
99	#define TCPOPT_TIMESTAMP 8
100	#define TCPOLEN_TIMESTAMP 10
101	#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
102
103	#define TCPOPT_TSTAMP_HDR \
104	(TCPOPT_NOP<<24\|TCPOPT_NOP<<16\|TCPOPT_TIMESTAMP<<8\|TCPOLEN_TIMESTAMP)
105
106	/*
107	* Default maximum segment size for TCP.
108	* With an IP MSS of 576, this is 536,
109	* but 512 is probably more convenient.
110	* This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
111	*/
112	#define TCP_MSS 512
113
114	#define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
115
116	#define TCP_MAX_WINSHIFT 14 /* maximum window shift */
117
118	/*
119	* User-settable options (used with setsockopt).
120	*/
121	/* #define TCP_NODELAY 0x01 / / don't delay send to coalesce packets */
122	/* #define TCP_MAXSEG 0x02 / / set maximum segment size */
123
124	/*
125	* TCP FSM state definitions.
126	* Per RFC793, September, 1981.
127	*/
128
129	#define TCP_NSTATES 11
130
131	#define TCPS_CLOSED 0 /* closed */
132	#define TCPS_LISTEN 1 /* listening for connection */
133	#define TCPS_SYN_SENT 2 /* active, have sent syn */
134	#define TCPS_SYN_RECEIVED 3 /* have send and received syn */
135	/* states < TCPS_ESTABLISHED are those where connections not established */
136	#define TCPS_ESTABLISHED 4 /* established */
137	#define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */
138	/* states > TCPS_CLOSE_WAIT are those where user has closed */
139	#define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */
140	#define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */
141	#define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */
142	/* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
143	#define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */
144	#define TCPS_TIME_WAIT 10 /* in 2msl quiet wait after close /
145
146	#define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
147	#define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
148	#define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
149
150	/*
151	* TCP sequence numbers are 32 bit integers operated
152	* on with modular arithmetic. These macros can be
153	* used to compare such integers.
154	*/
155	#define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
156	#define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
157	#define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
158	#define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
159
160	/*
161	* Macros to initialize tcp sequence numbers for
162	* send and receive from initial send and receive
163	* sequence numbers.
164	*/
165	#define tcp_rcvseqinit(tp) \
166	(tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
167
168	#define tcp_sendseqinit(tp) \
169	(tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss
170
171	#define TCP_ISSINCR (1251024) / increment for tcp_iss each second */
172
173	extern tcp_seq tcp_iss; /* tcp initial send seq # */
174
175	extern char *tcpstates[];
176
177	#endif