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