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1 | f0cbd3ec | bellard | /*
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2 | f0cbd3ec | bellard | * Copyright (c) 1982, 1986, 1993
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3 | f0cbd3ec | bellard | * The Regents of the University of California. All rights reserved.
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4 | f0cbd3ec | bellard | *
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5 | f0cbd3ec | bellard | * Redistribution and use in source and binary forms, with or without
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6 | f0cbd3ec | bellard | * modification, are permitted provided that the following conditions
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7 | f0cbd3ec | bellard | * are met:
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8 | f0cbd3ec | bellard | * 1. Redistributions of source code must retain the above copyright
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9 | f0cbd3ec | bellard | * notice, this list of conditions and the following disclaimer.
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10 | f0cbd3ec | bellard | * 2. Redistributions in binary form must reproduce the above copyright
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11 | f0cbd3ec | bellard | * notice, this list of conditions and the following disclaimer in the
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12 | f0cbd3ec | bellard | * documentation and/or other materials provided with the distribution.
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13 | f0cbd3ec | bellard | * 3. All advertising materials mentioning features or use of this software
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14 | f0cbd3ec | bellard | * must display the following acknowledgement:
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15 | f0cbd3ec | bellard | * This product includes software developed by the University of
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16 | f0cbd3ec | bellard | * California, Berkeley and its contributors.
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17 | f0cbd3ec | bellard | * 4. Neither the name of the University nor the names of its contributors
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18 | f0cbd3ec | bellard | * may be used to endorse or promote products derived from this software
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19 | f0cbd3ec | bellard | * without specific prior written permission.
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20 | f0cbd3ec | bellard | *
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21 | f0cbd3ec | bellard | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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22 | f0cbd3ec | bellard | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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23 | f0cbd3ec | bellard | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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24 | f0cbd3ec | bellard | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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25 | f0cbd3ec | bellard | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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26 | f0cbd3ec | bellard | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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27 | f0cbd3ec | bellard | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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28 | f0cbd3ec | bellard | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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29 | f0cbd3ec | bellard | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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30 | f0cbd3ec | bellard | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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31 | f0cbd3ec | bellard | * SUCH DAMAGE.
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32 | f0cbd3ec | bellard | *
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33 | f0cbd3ec | bellard | * @(#)tcp.h 8.1 (Berkeley) 6/10/93
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34 | f0cbd3ec | bellard | * tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp
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35 | f0cbd3ec | bellard | */
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36 | f0cbd3ec | bellard | |
37 | f0cbd3ec | bellard | #ifndef _TCP_H_
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38 | f0cbd3ec | bellard | #define _TCP_H_
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39 | f0cbd3ec | bellard | |
40 | f0cbd3ec | bellard | typedef u_int32_t tcp_seq;
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41 | f0cbd3ec | bellard | |
42 | f0cbd3ec | bellard | #define PR_SLOWHZ 2 /* 2 slow timeouts per second (approx) */ |
43 | f0cbd3ec | bellard | #define PR_FASTHZ 5 /* 5 fast timeouts per second (not important) */ |
44 | f0cbd3ec | bellard | |
45 | f0cbd3ec | bellard | extern int tcp_rcvspace; |
46 | f0cbd3ec | bellard | extern int tcp_sndspace; |
47 | f0cbd3ec | bellard | extern struct socket *tcp_last_so; |
48 | f0cbd3ec | bellard | |
49 | f0cbd3ec | bellard | #define TCP_SNDSPACE 8192 |
50 | f0cbd3ec | bellard | #define TCP_RCVSPACE 8192 |
51 | f0cbd3ec | bellard | |
52 | f0cbd3ec | bellard | /*
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53 | f0cbd3ec | bellard | * TCP header.
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54 | f0cbd3ec | bellard | * Per RFC 793, September, 1981.
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55 | f0cbd3ec | bellard | */
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56 | f0cbd3ec | bellard | struct tcphdr {
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57 | f0cbd3ec | bellard | u_int16_t th_sport; /* source port */
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58 | f0cbd3ec | bellard | u_int16_t th_dport; /* destination port */
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59 | f0cbd3ec | bellard | tcp_seq th_seq; /* sequence number */
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60 | f0cbd3ec | bellard | tcp_seq th_ack; /* acknowledgement number */
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61 | f0cbd3ec | bellard | #ifdef WORDS_BIGENDIAN
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62 | f0cbd3ec | bellard | u_int th_off:4, /* data offset */ |
63 | f0cbd3ec | bellard | th_x2:4; /* (unused) */ |
64 | f0cbd3ec | bellard | #else
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65 | f0cbd3ec | bellard | u_int th_x2:4, /* (unused) */ |
66 | f0cbd3ec | bellard | th_off:4; /* data offset */ |
67 | f0cbd3ec | bellard | #endif
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68 | f0cbd3ec | bellard | u_int8_t th_flags; |
69 | f0cbd3ec | bellard | #define TH_FIN 0x01 |
70 | f0cbd3ec | bellard | #define TH_SYN 0x02 |
71 | f0cbd3ec | bellard | #define TH_RST 0x04 |
72 | f0cbd3ec | bellard | #define TH_PUSH 0x08 |
73 | f0cbd3ec | bellard | #define TH_ACK 0x10 |
74 | f0cbd3ec | bellard | #define TH_URG 0x20 |
75 | f0cbd3ec | bellard | u_int16_t th_win; /* window */
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76 | f0cbd3ec | bellard | u_int16_t th_sum; /* checksum */
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77 | f0cbd3ec | bellard | u_int16_t th_urp; /* urgent pointer */
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78 | f0cbd3ec | bellard | }; |
79 | f0cbd3ec | bellard | |
80 | f0cbd3ec | bellard | #include "tcp_var.h" |
81 | f0cbd3ec | bellard | |
82 | f0cbd3ec | bellard | #define TCPOPT_EOL 0 |
83 | f0cbd3ec | bellard | #define TCPOPT_NOP 1 |
84 | f0cbd3ec | bellard | #define TCPOPT_MAXSEG 2 |
85 | f0cbd3ec | bellard | #define TCPOLEN_MAXSEG 4 |
86 | f0cbd3ec | bellard | #define TCPOPT_WINDOW 3 |
87 | f0cbd3ec | bellard | #define TCPOLEN_WINDOW 3 |
88 | f0cbd3ec | bellard | #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ |
89 | f0cbd3ec | bellard | #define TCPOLEN_SACK_PERMITTED 2 |
90 | f0cbd3ec | bellard | #define TCPOPT_SACK 5 /* Experimental */ |
91 | f0cbd3ec | bellard | #define TCPOPT_TIMESTAMP 8 |
92 | f0cbd3ec | bellard | #define TCPOLEN_TIMESTAMP 10 |
93 | f0cbd3ec | bellard | #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ |
94 | f0cbd3ec | bellard | |
95 | f0cbd3ec | bellard | #define TCPOPT_TSTAMP_HDR \
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96 | f0cbd3ec | bellard | (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) |
97 | f0cbd3ec | bellard | |
98 | f0cbd3ec | bellard | /*
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99 | f0cbd3ec | bellard | * Default maximum segment size for TCP.
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100 | f0cbd3ec | bellard | * With an IP MSS of 576, this is 536,
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101 | f0cbd3ec | bellard | * but 512 is probably more convenient.
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102 | f0cbd3ec | bellard | * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
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103 | f0cbd3ec | bellard | */
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104 | f0cbd3ec | bellard | #define TCP_MSS 512 |
105 | f0cbd3ec | bellard | |
106 | f0cbd3ec | bellard | #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ |
107 | f0cbd3ec | bellard | |
108 | f0cbd3ec | bellard | #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ |
109 | f0cbd3ec | bellard | |
110 | f0cbd3ec | bellard | /*
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111 | f0cbd3ec | bellard | * User-settable options (used with setsockopt).
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112 | f0cbd3ec | bellard | */
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113 | f0cbd3ec | bellard | /* #define TCP_NODELAY 0x01 */ /* don't delay send to coalesce packets */ |
114 | f0cbd3ec | bellard | /* #define TCP_MAXSEG 0x02 */ /* set maximum segment size */ |
115 | f0cbd3ec | bellard | |
116 | f0cbd3ec | bellard | /*
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117 | f0cbd3ec | bellard | * TCP FSM state definitions.
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118 | f0cbd3ec | bellard | * Per RFC793, September, 1981.
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119 | f0cbd3ec | bellard | */
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120 | f0cbd3ec | bellard | |
121 | f0cbd3ec | bellard | #define TCP_NSTATES 11 |
122 | f0cbd3ec | bellard | |
123 | f0cbd3ec | bellard | #define TCPS_CLOSED 0 /* closed */ |
124 | f0cbd3ec | bellard | #define TCPS_LISTEN 1 /* listening for connection */ |
125 | f0cbd3ec | bellard | #define TCPS_SYN_SENT 2 /* active, have sent syn */ |
126 | f0cbd3ec | bellard | #define TCPS_SYN_RECEIVED 3 /* have send and received syn */ |
127 | f0cbd3ec | bellard | /* states < TCPS_ESTABLISHED are those where connections not established */
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128 | f0cbd3ec | bellard | #define TCPS_ESTABLISHED 4 /* established */ |
129 | f0cbd3ec | bellard | #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */ |
130 | f0cbd3ec | bellard | /* states > TCPS_CLOSE_WAIT are those where user has closed */
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131 | f0cbd3ec | bellard | #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */ |
132 | f0cbd3ec | bellard | #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */ |
133 | f0cbd3ec | bellard | #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */ |
134 | f0cbd3ec | bellard | /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
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135 | f0cbd3ec | bellard | #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */ |
136 | f0cbd3ec | bellard | #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */ |
137 | f0cbd3ec | bellard | |
138 | f0cbd3ec | bellard | #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
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139 | f0cbd3ec | bellard | #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
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140 | f0cbd3ec | bellard | #define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
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141 | f0cbd3ec | bellard | |
142 | f0cbd3ec | bellard | /*
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143 | f0cbd3ec | bellard | * TCP sequence numbers are 32 bit integers operated
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144 | f0cbd3ec | bellard | * on with modular arithmetic. These macros can be
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145 | f0cbd3ec | bellard | * used to compare such integers.
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146 | f0cbd3ec | bellard | */
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147 | f0cbd3ec | bellard | #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) |
148 | f0cbd3ec | bellard | #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) |
149 | f0cbd3ec | bellard | #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) |
150 | f0cbd3ec | bellard | #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) |
151 | f0cbd3ec | bellard | |
152 | f0cbd3ec | bellard | /*
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153 | f0cbd3ec | bellard | * Macros to initialize tcp sequence numbers for
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154 | f0cbd3ec | bellard | * send and receive from initial send and receive
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155 | f0cbd3ec | bellard | * sequence numbers.
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156 | f0cbd3ec | bellard | */
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157 | f0cbd3ec | bellard | #define tcp_rcvseqinit(tp) \
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158 | f0cbd3ec | bellard | (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
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159 | f0cbd3ec | bellard | |
160 | f0cbd3ec | bellard | #define tcp_sendseqinit(tp) \
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161 | f0cbd3ec | bellard | (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss |
162 | f0cbd3ec | bellard | |
163 | f0cbd3ec | bellard | #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ |
164 | f0cbd3ec | bellard | |
165 | f0cbd3ec | bellard | extern tcp_seq tcp_iss; /* tcp initial send seq # */ |
166 | f0cbd3ec | bellard | |
167 | f0cbd3ec | bellard | extern char *tcpstates[]; |
168 | f0cbd3ec | bellard | |
169 | f0cbd3ec | bellard | #endif |