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1.1 root 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.
1.1.1.5 ! root 13: * 3. Neither the name of the University nor the names of its contributors
1.1 root 14: * 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:
36: typedef u_int32_t tcp_seq;
37:
38: #define PR_SLOWHZ 2 /* 2 slow timeouts per second (approx) */
39: #define PR_FASTHZ 5 /* 5 fast timeouts per second (not important) */
40:
41: extern struct socket *tcp_last_so;
42:
43: #define TCP_SNDSPACE 8192
44: #define TCP_RCVSPACE 8192
45:
46: /*
47: * TCP header.
48: * Per RFC 793, September, 1981.
49: */
50: struct tcphdr {
51: u_int16_t th_sport; /* source port */
52: u_int16_t th_dport; /* destination port */
53: tcp_seq th_seq; /* sequence number */
54: tcp_seq th_ack; /* acknowledgement number */
55: #ifdef WORDS_BIGENDIAN
56: u_int th_off:4, /* data offset */
57: th_x2:4; /* (unused) */
58: #else
59: u_int th_x2:4, /* (unused) */
60: th_off:4; /* data offset */
61: #endif
62: u_int8_t th_flags;
63: #define TH_FIN 0x01
64: #define TH_SYN 0x02
65: #define TH_RST 0x04
66: #define TH_PUSH 0x08
67: #define TH_ACK 0x10
68: #define TH_URG 0x20
69: u_int16_t th_win; /* window */
70: u_int16_t th_sum; /* checksum */
71: u_int16_t th_urp; /* urgent pointer */
72: };
73:
74: #include "tcp_var.h"
75:
76: #define TCPOPT_EOL 0
77: #define TCPOPT_NOP 1
78: #define TCPOPT_MAXSEG 2
79: #define TCPOLEN_MAXSEG 4
80: #define TCPOPT_WINDOW 3
81: #define TCPOLEN_WINDOW 3
82: #define TCPOPT_SACK_PERMITTED 4 /* Experimental */
83: #define TCPOLEN_SACK_PERMITTED 2
84: #define TCPOPT_SACK 5 /* Experimental */
85: #define TCPOPT_TIMESTAMP 8
86: #define TCPOLEN_TIMESTAMP 10
87: #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
88:
89: #define TCPOPT_TSTAMP_HDR \
90: (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
91:
92: /*
93: * Default maximum segment size for TCP.
94: * With an IP MSS of 576, this is 536,
95: * but 512 is probably more convenient.
96: * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
1.1.1.2 root 97: *
98: * We make this 1460 because we only care about Ethernet in the qemu context.
1.1 root 99: */
1.1.1.2 root 100: #define TCP_MSS 1460
1.1 root 101:
102: #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
103:
104: #define TCP_MAX_WINSHIFT 14 /* maximum window shift */
105:
106: /*
107: * User-settable options (used with setsockopt).
1.1.1.3 root 108: *
109: * We don't use the system headers on unix because we have conflicting
110: * local structures. We can't avoid the system definitions on Windows,
111: * so we undefine them.
1.1 root 112: */
1.1.1.3 root 113: #undef TCP_NODELAY
114: #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
115: #undef TCP_MAXSEG
1.1 root 116: /* #define TCP_MAXSEG 0x02 */ /* set maximum segment size */
117:
118: /*
119: * TCP FSM state definitions.
120: * Per RFC793, September, 1981.
121: */
122:
123: #define TCP_NSTATES 11
124:
125: #define TCPS_CLOSED 0 /* closed */
126: #define TCPS_LISTEN 1 /* listening for connection */
127: #define TCPS_SYN_SENT 2 /* active, have sent syn */
128: #define TCPS_SYN_RECEIVED 3 /* have send and received syn */
129: /* states < TCPS_ESTABLISHED are those where connections not established */
130: #define TCPS_ESTABLISHED 4 /* established */
131: #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */
132: /* states > TCPS_CLOSE_WAIT are those where user has closed */
133: #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */
134: #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */
135: #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */
136: /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
137: #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */
138: #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */
139:
140: #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
141: #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
142: #define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
143:
144: /*
145: * TCP sequence numbers are 32 bit integers operated
146: * on with modular arithmetic. These macros can be
147: * used to compare such integers.
148: */
149: #define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
150: #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
151: #define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
152: #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
153:
154: /*
155: * Macros to initialize tcp sequence numbers for
156: * send and receive from initial send and receive
157: * sequence numbers.
158: */
159: #define tcp_rcvseqinit(tp) \
160: (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
161:
162: #define tcp_sendseqinit(tp) \
163: (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss
164:
165: #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */
166:
167: extern tcp_seq tcp_iss; /* tcp initial send seq # */
168:
1.1.1.4 root 169: extern const char * const tcpstates[];
1.1 root 170:
171: #endif
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