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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.
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: struct tcphdr {
57: u_int16_t th_sport; /* source port */
58: u_int16_t th_dport; /* destination port */
59: tcp_seq th_seq; /* sequence number */
60: tcp_seq th_ack; /* acknowledgement number */
61: #ifdef WORDS_BIGENDIAN
62: u_int th_off:4, /* data offset */
63: th_x2:4; /* (unused) */
64: #else
65: u_int th_x2:4, /* (unused) */
66: th_off:4; /* data offset */
67: #endif
68: u_int8_t th_flags;
69: #define TH_FIN 0x01
70: #define TH_SYN 0x02
71: #define TH_RST 0x04
72: #define TH_PUSH 0x08
73: #define TH_ACK 0x10
74: #define TH_URG 0x20
75: u_int16_t th_win; /* window */
76: u_int16_t th_sum; /* checksum */
77: u_int16_t th_urp; /* urgent pointer */
78: };
79:
80: #include "tcp_var.h"
81:
82: #define TCPOPT_EOL 0
83: #define TCPOPT_NOP 1
84: #define TCPOPT_MAXSEG 2
85: #define TCPOLEN_MAXSEG 4
86: #define TCPOPT_WINDOW 3
87: #define TCPOLEN_WINDOW 3
88: #define TCPOPT_SACK_PERMITTED 4 /* Experimental */
89: #define TCPOLEN_SACK_PERMITTED 2
90: #define TCPOPT_SACK 5 /* Experimental */
91: #define TCPOPT_TIMESTAMP 8
92: #define TCPOLEN_TIMESTAMP 10
93: #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
94:
95: #define TCPOPT_TSTAMP_HDR \
96: (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
97:
98: /*
99: * Default maximum segment size for TCP.
100: * With an IP MSS of 576, this is 536,
101: * but 512 is probably more convenient.
102: * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
103: */
104: #define TCP_MSS 512
105:
106: #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
107:
108: #define TCP_MAX_WINSHIFT 14 /* maximum window shift */
109:
110: /*
111: * User-settable options (used with setsockopt).
112: */
113: /* #define TCP_NODELAY 0x01 */ /* don't delay send to coalesce packets */
114: /* #define TCP_MAXSEG 0x02 */ /* set maximum segment size */
115:
116: /*
117: * TCP FSM state definitions.
118: * Per RFC793, September, 1981.
119: */
120:
121: #define TCP_NSTATES 11
122:
123: #define TCPS_CLOSED 0 /* closed */
124: #define TCPS_LISTEN 1 /* listening for connection */
125: #define TCPS_SYN_SENT 2 /* active, have sent syn */
126: #define TCPS_SYN_RECEIVED 3 /* have send and received syn */
127: /* states < TCPS_ESTABLISHED are those where connections not established */
128: #define TCPS_ESTABLISHED 4 /* established */
129: #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */
130: /* states > TCPS_CLOSE_WAIT are those where user has closed */
131: #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */
132: #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */
133: #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */
134: /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
135: #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */
136: #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */
137:
138: #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
139: #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
140: #define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
141:
142: /*
143: * TCP sequence numbers are 32 bit integers operated
144: * on with modular arithmetic. These macros can be
145: * used to compare such integers.
146: */
147: #define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
148: #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
149: #define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
150: #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
151:
152: /*
153: * Macros to initialize tcp sequence numbers for
154: * send and receive from initial send and receive
155: * sequence numbers.
156: */
157: #define tcp_rcvseqinit(tp) \
158: (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
159:
160: #define tcp_sendseqinit(tp) \
161: (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss
162:
163: #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */
164:
165: extern tcp_seq tcp_iss; /* tcp initial send seq # */
166:
167: extern char *tcpstates[];
168:
169: #endif
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