| 1 | /* $Id: tcp.h 96407 2022-08-22 17:43:14Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * NAT - TCP.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2022 Oracle and/or its affiliates.
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox base platform packages, as
|
|---|
| 10 | * available from https://www.virtualbox.org.
|
|---|
| 11 | *
|
|---|
| 12 | * This program is free software; you can redistribute it and/or
|
|---|
| 13 | * modify it under the terms of the GNU General Public License
|
|---|
| 14 | * as published by the Free Software Foundation, in version 3 of the
|
|---|
| 15 | * License.
|
|---|
| 16 | *
|
|---|
| 17 | * This program is distributed in the hope that it will be useful, but
|
|---|
| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|---|
| 20 | * General Public License for more details.
|
|---|
| 21 | *
|
|---|
| 22 | * You should have received a copy of the GNU General Public License
|
|---|
| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
|
|---|
| 24 | *
|
|---|
| 25 | * SPDX-License-Identifier: GPL-3.0-only
|
|---|
| 26 | */
|
|---|
| 27 |
|
|---|
| 28 | /*
|
|---|
| 29 | * This code is based on:
|
|---|
| 30 | *
|
|---|
| 31 | * Copyright (c) 1982, 1986, 1993
|
|---|
| 32 | * The Regents of the University of California. All rights reserved.
|
|---|
| 33 | *
|
|---|
| 34 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 35 | * modification, are permitted provided that the following conditions
|
|---|
| 36 | * are met:
|
|---|
| 37 | * 1. Redistributions of source code must retain the above copyright
|
|---|
| 38 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 39 | * 2. Redistributions in binary form must reproduce the above copyright
|
|---|
| 40 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 41 | * documentation and/or other materials provided with the distribution.
|
|---|
| 42 | * 3. Neither the name of the University nor the names of its contributors
|
|---|
| 43 | * may be used to endorse or promote products derived from this software
|
|---|
| 44 | * without specific prior written permission.
|
|---|
| 45 | *
|
|---|
| 46 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|---|
| 47 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|---|
| 48 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|---|
| 49 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|---|
| 50 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|---|
| 51 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|---|
| 52 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|---|
| 53 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|---|
| 54 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|---|
| 55 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|---|
| 56 | * SUCH DAMAGE.
|
|---|
| 57 | *
|
|---|
| 58 | * @(#)tcp.h 8.1 (Berkeley) 6/10/93
|
|---|
| 59 | * tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp
|
|---|
| 60 | */
|
|---|
| 61 |
|
|---|
| 62 | #ifndef _TCP_H_
|
|---|
| 63 | #define _TCP_H_
|
|---|
| 64 |
|
|---|
| 65 | typedef uint32_t tcp_seq;
|
|---|
| 66 |
|
|---|
| 67 | #define PR_SLOWHZ 2 /* 2 slow timeouts per second (approx) */
|
|---|
| 68 | #define PR_FASTHZ 5 /* 5 fast timeouts per second (not important) */
|
|---|
| 69 |
|
|---|
| 70 | extern int tcp_rcvspace;
|
|---|
| 71 | extern int tcp_sndspace;
|
|---|
| 72 | extern struct socket *tcp_last_so;
|
|---|
| 73 |
|
|---|
| 74 | #define TCP_SNDSPACE 8192
|
|---|
| 75 | #define TCP_RCVSPACE 8192
|
|---|
| 76 |
|
|---|
| 77 | /*
|
|---|
| 78 | * TCP header.
|
|---|
| 79 | * Per RFC 793, September, 1981.
|
|---|
| 80 | */
|
|---|
| 81 | struct tcphdr
|
|---|
| 82 | {
|
|---|
| 83 | uint16_t th_sport; /* source port */
|
|---|
| 84 | uint16_t th_dport; /* destination port */
|
|---|
| 85 | tcp_seq th_seq; /* sequence number */
|
|---|
| 86 | tcp_seq th_ack; /* acknowledgement number */
|
|---|
| 87 | #ifdef WORDS_BIGENDIAN
|
|---|
| 88 | # ifdef _MSC_VER
|
|---|
| 89 | uint8_t th_off:4; /* data offset */
|
|---|
| 90 | uint8_t th_x2:4; /* (unused) */
|
|---|
| 91 | # else
|
|---|
| 92 | unsigned th_off:4; /* data offset */
|
|---|
| 93 | unsigned th_x2:4; /* (unused) */
|
|---|
| 94 | # endif
|
|---|
| 95 | #else
|
|---|
| 96 | # ifdef _MSC_VER
|
|---|
| 97 | uint8_t th_x2:4; /* (unused) */
|
|---|
| 98 | uint8_t th_off:4; /* data offset */
|
|---|
| 99 | # else
|
|---|
| 100 | unsigned th_x2:4; /* (unused) */
|
|---|
| 101 | unsigned th_off:4; /* data offset */
|
|---|
| 102 | # endif
|
|---|
| 103 | #endif
|
|---|
| 104 | uint8_t th_flags;
|
|---|
| 105 | #define TH_FIN 0x01
|
|---|
| 106 | #define TH_SYN 0x02
|
|---|
| 107 | #define TH_RST 0x04
|
|---|
| 108 | #define TH_PUSH 0x08
|
|---|
| 109 | #define TH_ACK 0x10
|
|---|
| 110 | #define TH_URG 0x20
|
|---|
| 111 | uint16_t th_win; /* window */
|
|---|
| 112 | uint16_t th_sum; /* checksum */
|
|---|
| 113 | uint16_t th_urp; /* urgent pointer */
|
|---|
| 114 | };
|
|---|
| 115 | AssertCompileSize(struct tcphdr, 20);
|
|---|
| 116 |
|
|---|
| 117 | #include "tcp_var.h"
|
|---|
| 118 |
|
|---|
| 119 | #define TCPOPT_EOL 0
|
|---|
| 120 | #define TCPOPT_NOP 1
|
|---|
| 121 | #define TCPOPT_MAXSEG 2
|
|---|
| 122 | #define TCPOLEN_MAXSEG 4
|
|---|
| 123 | #define TCPOPT_WINDOW 3
|
|---|
| 124 | #define TCPOLEN_WINDOW 3
|
|---|
| 125 | #define TCPOPT_SACK_PERMITTED 4 /* Experimental */
|
|---|
| 126 | #define TCPOLEN_SACK_PERMITTED 2
|
|---|
| 127 | #define TCPOPT_SACK 5 /* Experimental */
|
|---|
| 128 | #define TCPOPT_TIMESTAMP 8
|
|---|
| 129 | #define TCPOLEN_TIMESTAMP 10
|
|---|
| 130 | #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
|
|---|
| 131 |
|
|---|
| 132 | #define TCPOPT_TSTAMP_HDR \
|
|---|
| 133 | (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
|
|---|
| 134 |
|
|---|
| 135 | /*
|
|---|
| 136 | * Default maximum segment size for TCP.
|
|---|
| 137 | * With an IP MSS of 576, this is 536,
|
|---|
| 138 | * but 512 is probably more convenient.
|
|---|
| 139 | * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
|
|---|
| 140 | *
|
|---|
| 141 | * We make this 1460 because we only care about Ethernet in the qemu context.
|
|---|
| 142 | */
|
|---|
| 143 | #define TCP_MSS (if_mtu - 80)
|
|---|
| 144 |
|
|---|
| 145 | #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
|
|---|
| 146 |
|
|---|
| 147 | #define TCP_MAX_WINSHIFT 14 /* maximum window shift */
|
|---|
| 148 |
|
|---|
| 149 | /*
|
|---|
| 150 | * User-settable options (used with setsockopt).
|
|---|
| 151 | *
|
|---|
| 152 | * We don't use the system headers on unix because we have conflicting
|
|---|
| 153 | * local structures. We can't avoid the system definitions on Windows,
|
|---|
| 154 | * so we undefine them.
|
|---|
| 155 | */
|
|---|
| 156 | #undef TCP_NODELAY
|
|---|
| 157 | #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
|
|---|
| 158 | #undef TCP_MAXSEG
|
|---|
| 159 | /* #define TCP_MAXSEG 0x02 */ /* set maximum segment size */
|
|---|
| 160 |
|
|---|
| 161 | /*
|
|---|
| 162 | * TCP FSM state definitions.
|
|---|
| 163 | * Per RFC793, September, 1981.
|
|---|
| 164 | */
|
|---|
| 165 |
|
|---|
| 166 | #define TCP_NSTATES 11
|
|---|
| 167 |
|
|---|
| 168 | #define TCPS_CLOSED 0 /* closed */
|
|---|
| 169 | #define TCPS_LISTEN 1 /* listening for connection */
|
|---|
| 170 | #define TCPS_SYN_SENT 2 /* active, have sent syn */
|
|---|
| 171 | #define TCPS_SYN_RECEIVED 3 /* have send and received syn */
|
|---|
| 172 | /* states < TCPS_ESTABLISHED are those where connections not established */
|
|---|
| 173 | #define TCPS_ESTABLISHED 4 /* established */
|
|---|
| 174 | #define TCPS_CLOSE_WAIT 5 /* rcvd fin, waiting for close */
|
|---|
| 175 | /* states > TCPS_CLOSE_WAIT are those where user has closed */
|
|---|
| 176 | #define TCPS_FIN_WAIT_1 6 /* have closed, sent fin */
|
|---|
| 177 | #define TCPS_CLOSING 7 /* closed xchd FIN; await FIN ACK */
|
|---|
| 178 | #define TCPS_LAST_ACK 8 /* had fin and close; await FIN ACK */
|
|---|
| 179 | /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
|
|---|
| 180 | #define TCPS_FIN_WAIT_2 9 /* have closed, fin is acked */
|
|---|
| 181 | #define TCPS_TIME_WAIT 10 /* in 2*msl quiet wait after close */
|
|---|
| 182 |
|
|---|
| 183 | #define TCPS_HAVERCVDSYN(s) ((s) >= TCPS_SYN_RECEIVED)
|
|---|
| 184 | #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
|
|---|
| 185 | #define TCPS_HAVERCVDFIN(s) ((s) >= TCPS_TIME_WAIT)
|
|---|
| 186 |
|
|---|
| 187 | /*
|
|---|
| 188 | * TCP sequence numbers are 32 bit integers operated on with modular arithmetic.
|
|---|
| 189 | * These macros can be used to compare such integers.
|
|---|
| 190 | */
|
|---|
| 191 | #define SEQ_LT(a,b) ((int)((a)-(b)) < 0)
|
|---|
| 192 | #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
|
|---|
| 193 | #define SEQ_GT(a,b) ((int)((a)-(b)) > 0)
|
|---|
| 194 | #define SEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
|
|---|
| 195 |
|
|---|
| 196 | /*
|
|---|
| 197 | * Macros to initialize tcp sequence numbers for
|
|---|
| 198 | * send and receive from initial send and receive
|
|---|
| 199 | * sequence numbers.
|
|---|
| 200 | */
|
|---|
| 201 | #define tcp_rcvseqinit(tp) \
|
|---|
| 202 | (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
|
|---|
| 203 |
|
|---|
| 204 | #define tcp_sendseqinit(tp) \
|
|---|
| 205 | (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss
|
|---|
| 206 |
|
|---|
| 207 | #define TCP_ISSINCR (125*1024) /* increment for tcp_iss each second */
|
|---|
| 208 |
|
|---|
| 209 |
|
|---|
| 210 | extern const char * const tcpstates[];
|
|---|
| 211 |
|
|---|
| 212 | #endif
|
|---|
