bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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. |
aliguori | 2f5f899 | 2009-01-26 19:37:41 +0000 | [diff] [blame] | 13 | * 3. Neither the name of the University nor the names of its contributors |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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 | |
Markus Armbruster | 2a6a407 | 2016-06-29 13:47:03 +0200 | [diff] [blame] | 33 | #ifndef TCP_H |
| 34 | #define TCP_H |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 35 | |
Stefan Weil | b6dce92 | 2010-07-22 22:15:23 +0200 | [diff] [blame] | 36 | typedef uint32_t tcp_seq; |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 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 | |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 41 | #define TCP_SNDSPACE 8192 |
| 42 | #define TCP_RCVSPACE 8192 |
| 43 | |
| 44 | /* |
| 45 | * TCP header. |
| 46 | * Per RFC 793, September, 1981. |
| 47 | */ |
Paolo Bonzini | b722105 | 2012-03-22 01:02:51 +0100 | [diff] [blame] | 48 | #define tcphdr slirp_tcphdr |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 49 | struct tcphdr { |
Stefan Weil | b6dce92 | 2010-07-22 22:15:23 +0200 | [diff] [blame] | 50 | uint16_t th_sport; /* source port */ |
| 51 | uint16_t th_dport; /* destination port */ |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 52 | tcp_seq th_seq; /* sequence number */ |
| 53 | tcp_seq th_ack; /* acknowledgement number */ |
Juan Quintela | e2542fe | 2009-07-27 16:13:06 +0200 | [diff] [blame] | 54 | #ifdef HOST_WORDS_BIGENDIAN |
Jan Kiszka | 1b930bf | 2011-08-06 14:23:29 +0200 | [diff] [blame] | 55 | uint8_t th_off:4, /* data offset */ |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 56 | th_x2:4; /* (unused) */ |
| 57 | #else |
Jan Kiszka | 1b930bf | 2011-08-06 14:23:29 +0200 | [diff] [blame] | 58 | uint8_t th_x2:4, /* (unused) */ |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 59 | th_off:4; /* data offset */ |
| 60 | #endif |
Stefan Weil | b6dce92 | 2010-07-22 22:15:23 +0200 | [diff] [blame] | 61 | uint8_t th_flags; |
Stefan Weil | b6dce92 | 2010-07-22 22:15:23 +0200 | [diff] [blame] | 62 | uint16_t th_win; /* window */ |
| 63 | uint16_t th_sum; /* checksum */ |
| 64 | uint16_t th_urp; /* urgent pointer */ |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 65 | }; |
| 66 | |
| 67 | #include "tcp_var.h" |
| 68 | |
Paolo Bonzini | b722105 | 2012-03-22 01:02:51 +0100 | [diff] [blame] | 69 | #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 |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 79 | #define TCPOPT_EOL 0 |
| 80 | #define TCPOPT_NOP 1 |
| 81 | #define TCPOPT_MAXSEG 2 |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 82 | #define TCPOPT_WINDOW 3 |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 83 | #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 84 | #define TCPOPT_SACK 5 /* Experimental */ |
| 85 | #define TCPOPT_TIMESTAMP 8 |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 86 | |
| 87 | #define TCPOPT_TSTAMP_HDR \ |
| 88 | (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) |
Paolo Bonzini | b722105 | 2012-03-22 01:02:51 +0100 | [diff] [blame] | 89 | #endif |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 90 | |
Andreas Färber | e20e48a | 2012-04-28 00:29:05 +0200 | [diff] [blame] | 91 | #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 | |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 99 | /* |
| 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)). |
bellard | 773f2cd | 2006-05-01 11:17:27 +0000 | [diff] [blame] | 104 | * |
| 105 | * We make this 1460 because we only care about Ethernet in the qemu context. |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 106 | */ |
Paolo Bonzini | b722105 | 2012-03-22 01:02:51 +0100 | [diff] [blame] | 107 | #undef TCP_MSS |
bellard | 773f2cd | 2006-05-01 11:17:27 +0000 | [diff] [blame] | 108 | #define TCP_MSS 1460 |
Guillaume Subiron | 3feea44 | 2016-03-15 10:31:21 +0100 | [diff] [blame] | 109 | #undef TCP6_MSS |
| 110 | #define TCP6_MSS 1440 |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 111 | |
Paolo Bonzini | b722105 | 2012-03-22 01:02:51 +0100 | [diff] [blame] | 112 | #undef TCP_MAXWIN |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 113 | #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ |
| 114 | |
Paolo Bonzini | b722105 | 2012-03-22 01:02:51 +0100 | [diff] [blame] | 115 | #undef TCP_MAX_WINSHIFT |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 116 | #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ |
| 117 | |
| 118 | /* |
| 119 | * User-settable options (used with setsockopt). |
ths | 28d657f | 2006-12-23 00:03:15 +0000 | [diff] [blame] | 120 | * |
| 121 | * We don't use the system headers on unix because we have conflicting |
| 122 | * local structures. We can't avoid the system definitions on Windows, |
| 123 | * so we undefine them. |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 124 | */ |
ths | 28d657f | 2006-12-23 00:03:15 +0000 | [diff] [blame] | 125 | #undef TCP_NODELAY |
ths | eaf7e70 | 2006-12-21 19:10:59 +0000 | [diff] [blame] | 126 | #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ |
ths | 28d657f | 2006-12-23 00:03:15 +0000 | [diff] [blame] | 127 | #undef TCP_MAXSEG |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 128 | |
| 129 | /* |
| 130 | * TCP FSM state definitions. |
| 131 | * Per RFC793, September, 1981. |
| 132 | */ |
| 133 | |
| 134 | #define TCP_NSTATES 11 |
| 135 | |
| 136 | #define TCPS_CLOSED 0 /* closed */ |
| 137 | #define TCPS_LISTEN 1 /* listening for connection */ |
| 138 | #define TCPS_SYN_SENT 2 /* active, have sent syn */ |
| 139 | #define TCPS_SYN_RECEIVED 3 /* have send and received syn */ |
| 140 | /* states < TCPS_ESTABLISHED are those where connections not established */ |
| 141 | #define TCPS_ESTABLISHED 4 /* established */ |
| 142 | #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */ |
| 143 | /* states > TCPS_CLOSE_WAIT are those where user has closed */ |
| 144 | #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */ |
| 145 | #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */ |
| 146 | #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */ |
| 147 | /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */ |
| 148 | #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */ |
| 149 | #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */ |
| 150 | |
| 151 | #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED) |
| 152 | #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED) |
| 153 | #define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT) |
| 154 | |
| 155 | /* |
| 156 | * TCP sequence numbers are 32 bit integers operated |
| 157 | * on with modular arithmetic. These macros can be |
| 158 | * used to compare such integers. |
| 159 | */ |
| 160 | #define SEQ_LT(a,b) ((int)((a)-(b)) < 0) |
| 161 | #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) |
| 162 | #define SEQ_GT(a,b) ((int)((a)-(b)) > 0) |
| 163 | #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0) |
| 164 | |
| 165 | /* |
| 166 | * Macros to initialize tcp sequence numbers for |
| 167 | * send and receive from initial send and receive |
| 168 | * sequence numbers. |
| 169 | */ |
| 170 | #define tcp_rcvseqinit(tp) \ |
| 171 | (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1 |
| 172 | |
| 173 | #define tcp_sendseqinit(tp) \ |
| 174 | (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss |
| 175 | |
| 176 | #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */ |
| 177 | |
bellard | f0cbd3e | 2004-04-22 00:10:48 +0000 | [diff] [blame] | 178 | #endif |