1 /* 2 * Copyright (c) 2000-2018 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 /* 29 * Copyright (c) 1982, 1986, 1993 30 * The Regents of the University of California. All rights reserved. 31 * 32 * Redistribution and use in source and binary forms, with or without 33 * modification, are permitted provided that the following conditions 34 * are met: 35 * 1. Redistributions of source code must retain the above copyright 36 * notice, this list of conditions and the following disclaimer. 37 * 2. Redistributions in binary form must reproduce the above copyright 38 * notice, this list of conditions and the following disclaimer in the 39 * documentation and/or other materials provided with the distribution. 40 * 3. All advertising materials mentioning features or use of this software 41 * must display the following acknowledgement: 42 * This product includes software developed by the University of 43 * California, Berkeley and its contributors. 44 * 4. Neither the name of the University nor the names of its contributors 45 * may be used to endorse or promote products derived from this software 46 * without specific prior written permission. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * @(#)tcp.h 8.1 (Berkeley) 6/10/93 61 * $FreeBSD: src/sys/netinet/tcp.h,v 1.13.2.3 2001/03/01 22:08:42 jlemon Exp $ 62 */ 63 64 #ifndef _NETINET_TCP_H_ 65 #define _NETINET_TCP_H_ 66 #ifndef DRIVERKIT 67 #include <sys/appleapiopts.h> 68 #include <sys/socket.h> 69 #include <sys/types.h> 70 #endif /* DRIVERKIT */ 71 72 #include <machine/endian.h> 73 #include <machine/types.h> /* __uint32_t */ 74 #include <netinet/in.h> 75 76 #ifndef DRIVERKIT 77 #include <sys/types.h> 78 #else 79 #include <sys/_types.h> 80 #endif /* DRIVERKIT */ 81 82 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) 83 typedef __uint32_t tcp_seq; 84 typedef __uint32_t tcp_cc; /* connection count per rfc1644 */ 85 86 #define tcp6_seq tcp_seq /* for KAME src sync over BSD*'s */ 87 #define tcp6hdr tcphdr /* for KAME src sync over BSD*'s */ 88 89 /* 90 * TCP header. 91 * Per RFC 793, September, 1981. 92 */ 93 struct tcphdr { 94 unsigned short th_sport; /* source port */ 95 unsigned short th_dport; /* destination port */ 96 tcp_seq th_seq; /* sequence number */ 97 tcp_seq th_ack; /* acknowledgement number */ 98 #if __DARWIN_BYTE_ORDER == __DARWIN_LITTLE_ENDIAN 99 unsigned int th_x2:4, /* (unused) */ 100 th_off:4; /* data offset */ 101 #endif 102 #if __DARWIN_BYTE_ORDER == __DARWIN_BIG_ENDIAN 103 unsigned int th_off:4, /* data offset */ 104 th_x2:4; /* (unused) */ 105 #endif 106 unsigned char th_flags; 107 #define TH_FIN 0x01 108 #define TH_SYN 0x02 109 #define TH_RST 0x04 110 #define TH_PUSH 0x08 111 #define TH_ACK 0x10 112 #define TH_URG 0x20 113 #define TH_ECE 0x40 114 #define TH_CWR 0x80 115 #define TH_AE 0x100 /* maps into th_x2 */ 116 #define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG|TH_ECE|TH_CWR) 117 #define TH_FLAGS_ALL (TH_FLAGS|TH_PUSH) 118 #define TH_ACCEPT (TH_FIN|TH_SYN|TH_RST|TH_ACK) 119 #define TH_ACE (TH_AE|TH_CWR|TH_ECE) 120 121 unsigned short th_win; /* window */ 122 unsigned short th_sum; /* checksum */ 123 unsigned short th_urp; /* urgent pointer */ 124 }; 125 126 #define TCPOPT_EOL 0 127 #define TCPOPT_NOP 1 128 #define TCPOPT_MAXSEG 2 129 #define TCPOLEN_MAXSEG 4 130 #define TCPOPT_WINDOW 3 131 #define TCPOLEN_WINDOW 3 132 #define TCPOPT_SACK_PERMITTED 4 /* Experimental */ 133 #define TCPOLEN_SACK_PERMITTED 2 134 #define TCPOPT_SACK 5 /* Experimental */ 135 #define TCPOLEN_SACK 8 /* len of sack block */ 136 #define TCPOPT_TIMESTAMP 8 137 #define TCPOLEN_TIMESTAMP 10 138 #define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */ 139 #define TCPOPT_TSTAMP_HDR \ 140 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP) 141 142 #define MAX_TCPOPTLEN 40 /* Absolute maximum TCP options len */ 143 144 #define TCPOPT_CC 11 /* CC options: RFC-1644 */ 145 #define TCPOPT_CCNEW 12 146 #define TCPOPT_CCECHO 13 147 #define TCPOLEN_CC 6 148 #define TCPOLEN_CC_APPA (TCPOLEN_CC+2) 149 #define TCPOPT_CC_HDR(ccopt) \ 150 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC) 151 #define TCPOPT_SIGNATURE 19 /* Keyed MD5: RFC 2385 */ 152 #define TCPOLEN_SIGNATURE 18 153 #if MPTCP 154 #define TCPOPT_MULTIPATH 30 155 #endif 156 157 #define TCPOPT_FASTOPEN 34 158 #define TCPOLEN_FASTOPEN_REQ 2 159 160 #define TCPOPT_ACCECN0 0xAC /* AccECN Order 0 */ 161 #define TCPOPT_ACCECN1 0XAE /* AccECN Order 1 */ 162 #define TCPOLEN_ACCECN_EMPTY 2 /* Empty option contains kind and length */ 163 #define TCPOLEN_ACCECN_COUNTER 3 /* Length of each AccECN counter */ 164 165 /* Option definitions */ 166 #define TCPOPT_SACK_PERMIT_HDR \ 167 (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK_PERMITTED<<8|TCPOLEN_SACK_PERMITTED) 168 #define TCPOPT_SACK_HDR (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_SACK<<8) 169 /* Miscellaneous constants */ 170 #define MAX_SACK_BLKS 6 /* Max # SACK blocks stored at sender side */ 171 172 /* 173 * A SACK option that specifies n blocks will have a length of (8*n + 2) 174 * bytes, so the 40 bytes available for TCP options can specify a 175 * maximum of 4 blocks. 176 */ 177 178 #define TCP_MAX_SACK 4 /* MAX # SACKs sent in any segment */ 179 180 181 /* 182 * Default maximum segment size for TCP. 183 * With an IP MTU of 576, this is 536, 184 * but 512 is probably more convenient. 185 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)). 186 */ 187 #define TCP_MSS 512 188 189 /* 190 * TCP_MINMSS is defined to be 216 which is fine for the smallest 191 * link MTU (256 bytes, SLIP interface) in the Internet. 192 * However it is very unlikely to come across such low MTU interfaces 193 * these days (anno dato 2004). 194 * Probably it can be set to 512 without ill effects. But we play safe. 195 * See tcp_subr.c tcp_minmss SYSCTL declaration for more comments. 196 * Setting this to "0" disables the minmss check. 197 */ 198 #define TCP_MINMSS 216 199 200 /* 201 * Default maximum segment size for TCP6. 202 * With an IP6 MSS of 1280, this is 1220, 203 * but 1024 is probably more convenient. (xxx kazu in doubt) 204 * This should be defined as MIN(1024, IP6_MSS - sizeof (struct tcpip6hdr)) 205 */ 206 #define TCP6_MSS 1024 207 208 #define TCP_MAXWIN 65535 /* largest value for (unscaled) window */ 209 #define TTCP_CLIENT_SND_WND 4096 /* dflt send window for T/TCP client */ 210 211 #define TCP_MAX_WINSHIFT 14 /* maximum window shift */ 212 213 #define TCP_MAXHLEN (0xf<<2) /* max length of header in bytes */ 214 #define TCP_MAXOLEN (TCP_MAXHLEN - sizeof(struct tcphdr)) 215 /* max space left for options */ 216 #endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */ 217 218 /* 219 * User-settable options (used with setsockopt). 220 */ 221 #define TCP_NODELAY 0x01 /* don't delay send to coalesce packets */ 222 #if !defined(_POSIX_C_SOURCE) || defined(_DARWIN_C_SOURCE) 223 #define TCP_MAXSEG 0x02 /* set maximum segment size */ 224 #define TCP_NOPUSH 0x04 /* don't push last block of write */ 225 #define TCP_NOOPT 0x08 /* don't use TCP options */ 226 #define TCP_KEEPALIVE 0x10 /* idle time used when SO_KEEPALIVE is enabled */ 227 #define TCP_CONNECTIONTIMEOUT 0x20 /* connection timeout */ 228 #define PERSIST_TIMEOUT 0x40 /* time after which a connection in 229 * persist timeout will terminate. 230 * see draft-ananth-tcpm-persist-02.txt 231 */ 232 #define TCP_RXT_CONNDROPTIME 0x80 /* time after which tcp retransmissions will be 233 * stopped and the connection will be dropped 234 */ 235 #define TCP_RXT_FINDROP 0x100 /* when this option is set, drop a connection 236 * after retransmitting the FIN 3 times. It will 237 * prevent holding too many mbufs in socket 238 * buffer queues. 239 */ 240 #define TCP_KEEPINTVL 0x101 /* interval between keepalives */ 241 #define TCP_KEEPCNT 0x102 /* number of keepalives before close */ 242 #define TCP_SENDMOREACKS 0x103 /* always ack every other packet */ 243 #define TCP_ENABLE_ECN 0x104 /* Enable ECN on a connection */ 244 #define TCP_FASTOPEN 0x105 /* Enable/Disable TCP Fastopen on this socket */ 245 #define TCP_CONNECTION_INFO 0x106 /* State of TCP connection */ 246 247 #ifdef PRIVATE 248 /* See tcp_private.h for additional options */ 249 #endif /* PRIVATE */ 250 251 252 #define TCP_NOTSENT_LOWAT 0x201 /* Low water mark for TCP unsent data */ 253 254 struct tcp_connection_info { 255 u_int8_t tcpi_state; /* connection state */ 256 u_int8_t tcpi_snd_wscale; /* Window scale for send window */ 257 u_int8_t tcpi_rcv_wscale; /* Window scale for receive window */ 258 u_int8_t __pad1; 259 u_int32_t tcpi_options; /* TCP options supported */ 260 #define TCPCI_OPT_TIMESTAMPS 0x00000001 /* Timestamps enabled */ 261 #define TCPCI_OPT_SACK 0x00000002 /* SACK enabled */ 262 #define TCPCI_OPT_WSCALE 0x00000004 /* Window scaling enabled */ 263 #define TCPCI_OPT_ECN 0x00000008 /* ECN enabled */ 264 u_int32_t tcpi_flags; /* flags */ 265 #define TCPCI_FLAG_LOSSRECOVERY 0x00000001 266 #define TCPCI_FLAG_REORDERING_DETECTED 0x00000002 267 u_int32_t tcpi_rto; /* retransmit timeout in ms */ 268 u_int32_t tcpi_maxseg; /* maximum segment size supported */ 269 u_int32_t tcpi_snd_ssthresh; /* slow start threshold in bytes */ 270 u_int32_t tcpi_snd_cwnd; /* send congestion window in bytes */ 271 u_int32_t tcpi_snd_wnd; /* send widnow in bytes */ 272 u_int32_t tcpi_snd_sbbytes; /* bytes in send socket buffer, including in-flight data */ 273 u_int32_t tcpi_rcv_wnd; /* receive window in bytes*/ 274 u_int32_t tcpi_rttcur; /* most recent RTT in ms */ 275 u_int32_t tcpi_srtt; /* average RTT in ms */ 276 u_int32_t tcpi_rttvar; /* RTT variance */ 277 u_int32_t 278 tcpi_tfo_cookie_req:1, /* Cookie requested? */ 279 tcpi_tfo_cookie_rcv:1, /* Cookie received? */ 280 tcpi_tfo_syn_loss:1, /* Fallback to reg. TCP after SYN-loss */ 281 tcpi_tfo_syn_data_sent:1, /* SYN+data has been sent out */ 282 tcpi_tfo_syn_data_acked:1, /* SYN+data has been fully acknowledged */ 283 tcpi_tfo_syn_data_rcv:1, /* Server received SYN+data with a valid cookie */ 284 tcpi_tfo_cookie_req_rcv:1, /* Server received cookie-request */ 285 tcpi_tfo_cookie_sent:1, /* Server announced cookie */ 286 tcpi_tfo_cookie_invalid:1, /* Server received an invalid cookie */ 287 tcpi_tfo_cookie_wrong:1, /* Our sent cookie was wrong */ 288 tcpi_tfo_no_cookie_rcv:1, /* We did not receive a cookie upon our request */ 289 tcpi_tfo_heuristics_disable:1, /* TFO-heuristics disabled it */ 290 tcpi_tfo_send_blackhole:1, /* A sending-blackhole got detected */ 291 tcpi_tfo_recv_blackhole:1, /* A receiver-blackhole got detected */ 292 tcpi_tfo_onebyte_proxy:1, /* A proxy acknowledges all but one byte of the SYN */ 293 __pad2:17; 294 u_int64_t tcpi_txpackets __attribute__((aligned(8))); 295 u_int64_t tcpi_txbytes __attribute__((aligned(8))); 296 u_int64_t tcpi_txretransmitbytes __attribute__((aligned(8))); 297 u_int64_t tcpi_rxpackets __attribute__((aligned(8))); 298 u_int64_t tcpi_rxbytes __attribute__((aligned(8))); 299 u_int64_t tcpi_rxoutoforderbytes __attribute__((aligned(8))); 300 u_int64_t tcpi_txretransmitpackets __attribute__((aligned(8))); 301 }; 302 #endif /* (_POSIX_C_SOURCE && !_DARWIN_C_SOURCE) */ 303 304 #ifdef PRIVATE 305 #include <netinet/tcp_private.h> 306 #endif 307 308 #endif 309