309 lines
14 KiB
C
309 lines
14 KiB
C
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/*
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* Copyright (c) 2000-2018 Apple Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tcp.h 8.1 (Berkeley) 6/10/93
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* $FreeBSD: src/sys/netinet/tcp.h,v 1.13.2.3 2001/03/01 22:08:42 jlemon Exp $
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*/
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#ifndef _NETINET_TCP_H_
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#define _NETINET_TCP_H_
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#ifndef DRIVERKIT
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#include <sys/appleapiopts.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#endif /* DRIVERKIT */
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#include <machine/endian.h>
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#include <machine/types.h> /* __uint32_t */
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#include <netinet/in.h>
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#ifndef DRIVERKIT
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#include <sys/types.h>
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#else
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#include <sys/_types.h>
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#endif /* DRIVERKIT */
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#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
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typedef __uint32_t tcp_seq;
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typedef __uint32_t tcp_cc; /* connection count per rfc1644 */
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#define tcp6_seq tcp_seq /* for KAME src sync over BSD*'s */
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#define tcp6hdr tcphdr /* for KAME src sync over BSD*'s */
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/*
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* TCP header.
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* Per RFC 793, September, 1981.
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*/
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struct tcphdr {
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unsigned short th_sport; /* source port */
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unsigned short th_dport; /* destination port */
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tcp_seq th_seq; /* sequence number */
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tcp_seq th_ack; /* acknowledgement number */
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#if __DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN
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unsigned int th_x2:4, /* (unused) */
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th_off:4; /* data offset */
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#endif
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#if __DARWIN_BYTE_ORDER == __DARWIN_BIG_ENDIAN
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unsigned int th_off:4, /* data offset */
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th_x2:4; /* (unused) */
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#endif
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unsigned char th_flags;
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#define TH_FIN 0x01
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#define TH_SYN 0x02
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#define TH_RST 0x04
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#define TH_PUSH 0x08
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#define TH_ACK 0x10
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#define TH_URG 0x20
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#define TH_ECE 0x40
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#define TH_CWR 0x80
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#define TH_AE 0x100 /* maps into th_x2 */
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#define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR)
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#define TH_FLAGS_ALL (TH_FLAGS|TH_PUSH)
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#define TH_ACCEPT (TH_FIN|TH_SYN|TH_RST|TH_ACK)
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#define TH_ACE (TH_AE|TH_CWR|TH_ECE)
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unsigned short th_win; /* window */
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unsigned short th_sum; /* checksum */
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unsigned short th_urp; /* urgent pointer */
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};
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#define TCPOPT_EOL 0
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#define TCPOPT_NOP 1
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#define TCPOPT_MAXSEG 2
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#define TCPOLEN_MAXSEG 4
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#define TCPOPT_WINDOW 3
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#define TCPOLEN_WINDOW 3
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#define TCPOPT_SACK_PERMITTED 4 /* Experimental */
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#define TCPOLEN_SACK_PERMITTED 2
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#define TCPOPT_SACK 5 /* Experimental */
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#define TCPOLEN_SACK 8 /* len of sack block */
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#define TCPOPT_TIMESTAMP 8
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#define TCPOLEN_TIMESTAMP 10
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#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
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#define TCPOPT_TSTAMP_HDR \
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(TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
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#define MAX_TCPOPTLEN 40 /* Absolute maximum TCP options len */
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#define TCPOPT_CC 11 /* CC options: RFC-1644 */
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#define TCPOPT_CCNEW 12
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#define TCPOPT_CCECHO 13
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#define TCPOLEN_CC 6
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#define TCPOLEN_CC_APPA (TCPOLEN_CC+2)
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#define TCPOPT_CC_HDR(ccopt) \
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(TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC)
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#define TCPOPT_SIGNATURE 19 /* Keyed MD5: RFC 2385 */
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#define TCPOLEN_SIGNATURE 18
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#if MPTCP
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#define TCPOPT_MULTIPATH 30
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#endif
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#define TCPOPT_FASTOPEN 34
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#define TCPOLEN_FASTOPEN_REQ 2
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#define TCPOPT_ACCECN0 0xAC /* AccECN Order 0 */
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#define TCPOPT_ACCECN1 0XAE /* AccECN Order 1 */
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#define TCPOLEN_ACCECN_EMPTY 2 /* Empty option contains kind and length */
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#define TCPOLEN_ACCECN_COUNTER 3 /* Length of each AccECN counter */
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/* Option definitions */
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#define TCPOPT_SACK_PERMIT_HDR \
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(TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK_PERMITTED<<8|TCPOLEN_SACK_PERMITTED)
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#define TCPOPT_SACK_HDR (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK<<8)
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/* Miscellaneous constants */
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#define MAX_SACK_BLKS 6 /* Max # SACK blocks stored at sender side */
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/*
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* A SACK option that specifies n blocks will have a length of (8*n + 2)
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* bytes, so the 40 bytes available for TCP options can specify a
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* maximum of 4 blocks.
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*/
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#define TCP_MAX_SACK 4 /* MAX # SACKs sent in any segment */
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/*
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* Default maximum segment size for TCP.
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* With an IP MTU of 576, this is 536,
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* but 512 is probably more convenient.
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* This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
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*/
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#define TCP_MSS 512
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/*
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* TCP_MINMSS is defined to be 216 which is fine for the smallest
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* link MTU (256 bytes, SLIP interface) in the Internet.
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* However it is very unlikely to come across such low MTU interfaces
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* these days (anno dato 2004).
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* Probably it can be set to 512 without ill effects. But we play safe.
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* See tcp_subr.c tcp_minmss SYSCTL declaration for more comments.
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* Setting this to "0" disables the minmss check.
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*/
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#define TCP_MINMSS 216
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/*
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* Default maximum segment size for TCP6.
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* With an IP6 MSS of 1280, this is 1220,
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* but 1024 is probably more convenient. (xxx kazu in doubt)
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* This should be defined as MIN(1024, IP6_MSS - sizeof (struct tcpip6hdr))
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*/
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#define TCP6_MSS 1024
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#define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
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#define TTCP_CLIENT_SND_WND 4096 /* dflt send window for T/TCP client */
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#define TCP_MAX_WINSHIFT 14 /* maximum window shift */
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#define TCP_MAXHLEN (0xf<<2) /* max length of header in bytes */
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#define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr))
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/* max space left for options */
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#endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */
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/*
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* User-settable options (used with setsockopt).
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*/
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#define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */
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#if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE)
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#define TCP_MAXSEG 0x02 /* set maximum segment size */
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#define TCP_NOPUSH 0x04 /* don't push last block of write */
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#define TCP_NOOPT 0x08 /* don't use TCP options */
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#define TCP_KEEPALIVE 0x10 /* idle time used when SO_KEEPALIVE is enabled */
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#define TCP_CONNECTIONTIMEOUT 0x20 /* connection timeout */
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#define PERSIST_TIMEOUT 0x40 /* time after which a connection in
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* persist timeout will terminate.
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* see draft-ananth-tcpm-persist-02.txt
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*/
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#define TCP_RXT_CONNDROPTIME 0x80 /* time after which tcp retransmissions will be
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* stopped and the connection will be dropped
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*/
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#define TCP_RXT_FINDROP 0x100 /* when this option is set, drop a connection
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* after retransmitting the FIN 3 times. It will
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* prevent holding too many mbufs in socket
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* buffer queues.
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*/
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#define TCP_KEEPINTVL 0x101 /* interval between keepalives */
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#define TCP_KEEPCNT 0x102 /* number of keepalives before close */
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#define TCP_SENDMOREACKS 0x103 /* always ack every other packet */
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#define TCP_ENABLE_ECN 0x104 /* Enable ECN on a connection */
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#define TCP_FASTOPEN 0x105 /* Enable/Disable TCP Fastopen on this socket */
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#define TCP_CONNECTION_INFO 0x106 /* State of TCP connection */
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#ifdef PRIVATE
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/* See tcp_private.h for additional options */
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#endif /* PRIVATE */
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#define TCP_NOTSENT_LOWAT 0x201 /* Low water mark for TCP unsent data */
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struct tcp_connection_info {
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u_int8_t tcpi_state; /* connection state */
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u_int8_t tcpi_snd_wscale; /* Window scale for send window */
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u_int8_t tcpi_rcv_wscale; /* Window scale for receive window */
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u_int8_t __pad1;
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u_int32_t tcpi_options; /* TCP options supported */
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#define TCPCI_OPT_TIMESTAMPS 0x00000001 /* Timestamps enabled */
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#define TCPCI_OPT_SACK 0x00000002 /* SACK enabled */
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#define TCPCI_OPT_WSCALE 0x00000004 /* Window scaling enabled */
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#define TCPCI_OPT_ECN 0x00000008 /* ECN enabled */
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u_int32_t tcpi_flags; /* flags */
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#define TCPCI_FLAG_LOSSRECOVERY 0x00000001
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#define TCPCI_FLAG_REORDERING_DETECTED 0x00000002
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u_int32_t tcpi_rto; /* retransmit timeout in ms */
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u_int32_t tcpi_maxseg; /* maximum segment size supported */
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u_int32_t tcpi_snd_ssthresh; /* slow start threshold in bytes */
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u_int32_t tcpi_snd_cwnd; /* send congestion window in bytes */
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u_int32_t tcpi_snd_wnd; /* send widnow in bytes */
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u_int32_t tcpi_snd_sbbytes; /* bytes in send socket buffer, including in-flight data */
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u_int32_t tcpi_rcv_wnd; /* receive window in bytes*/
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u_int32_t tcpi_rttcur; /* most recent RTT in ms */
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u_int32_t tcpi_srtt; /* average RTT in ms */
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u_int32_t tcpi_rttvar; /* RTT variance */
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u_int32_t
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tcpi_tfo_cookie_req:1, /* Cookie requested? */
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tcpi_tfo_cookie_rcv:1, /* Cookie received? */
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tcpi_tfo_syn_loss:1, /* Fallback to reg. TCP after SYN-loss */
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tcpi_tfo_syn_data_sent:1, /* SYN+data has been sent out */
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tcpi_tfo_syn_data_acked:1, /* SYN+data has been fully acknowledged */
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tcpi_tfo_syn_data_rcv:1, /* Server received SYN+data with a valid cookie */
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tcpi_tfo_cookie_req_rcv:1, /* Server received cookie-request */
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tcpi_tfo_cookie_sent:1, /* Server announced cookie */
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tcpi_tfo_cookie_invalid:1, /* Server received an invalid cookie */
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tcpi_tfo_cookie_wrong:1, /* Our sent cookie was wrong */
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tcpi_tfo_no_cookie_rcv:1, /* We did not receive a cookie upon our request */
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tcpi_tfo_heuristics_disable:1, /* TFO-heuristics disabled it */
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tcpi_tfo_send_blackhole:1, /* A sending-blackhole got detected */
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tcpi_tfo_recv_blackhole:1, /* A receiver-blackhole got detected */
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tcpi_tfo_onebyte_proxy:1, /* A proxy acknowledges all but one byte of the SYN */
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__pad2:17;
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u_int64_t tcpi_txpackets __attribute__((aligned(8)));
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u_int64_t tcpi_txbytes __attribute__((aligned(8)));
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u_int64_t tcpi_txretransmitbytes __attribute__((aligned(8)));
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u_int64_t tcpi_rxpackets __attribute__((aligned(8)));
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u_int64_t tcpi_rxbytes __attribute__((aligned(8)));
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u_int64_t tcpi_rxoutoforderbytes __attribute__((aligned(8)));
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u_int64_t tcpi_txretransmitpackets __attribute__((aligned(8)));
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};
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#endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */
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#ifdef PRIVATE
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#include <netinet/tcp_private.h>
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#endif
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#endif
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