/*

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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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* 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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*/

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#ifndef _NETINET_TCP_H

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#define _NETINET_TCP_H 1

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#include <features.h>

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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 1 /* Don't delay send to coalesce packets */

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#define TCP_MAXSEG 2 /* Set maximum segment size */

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#define TCP_CORK 3 /* Control sending of partial frames */

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#define TCP_KEEPIDLE 4 /* Start keeplives after this period */

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#define TCP_KEEPINTVL 5 /* Interval between keepalives */

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#define TCP_KEEPCNT 6 /* Number of keepalives before death */

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#define TCP_SYNCNT 7 /* Number of SYN retransmits */

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#define TCP_LINGER2 8 /* Life time of orphaned FIN-WAIT-2 state */

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#define TCP_DEFER_ACCEPT 9 /* Wake up listener only when data arrive */

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#define TCP_WINDOW_CLAMP 10 /* Bound advertised window */

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#define TCP_INFO 11 /* Information about this connection. */

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#define TCP_QUICKACK 12 /* Bock/reenable quick ACKs. */

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#define TCP_CONGESTION 13 /* Congestion control algorithm. */

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#define TCP_MD5SIG 14 /* TCP MD5 Signature (RFC2385) */

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#define TCP_COOKIE_TRANSACTIONS 15 /* TCP Cookie Transactions */

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#define TCP_THIN_LINEAR_TIMEOUTS 16 /* Use linear timeouts for thin streams*/

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#define TCP_THIN_DUPACK 17 /* Fast retrans. after 1 dupack */

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#define TCP_USER_TIMEOUT 18 /* How long for loss retry before timeout */

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#define TCP_REPAIR 19 /* TCP sock is under repair right now */

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#define TCP_REPAIR_QUEUE 20 /* Set TCP queue to repair */

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#define TCP_QUEUE_SEQ 21 /* Set sequence number of repaired queue. */

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#define TCP_REPAIR_OPTIONS 22 /* Repair TCP connection options */

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#define TCP_FASTOPEN 23 /* Enable FastOpen on listeners */

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#define TCP_TIMESTAMP 24 /* TCP time stamp */

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#define TCP_NOTSENT_LOWAT 25 /* Limit number of unsent bytes in

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write queue. */

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#define TCP_CC_INFO 26 /* Get Congestion Control

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(optional) info. */

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#define TCP_SAVE_SYN 27 /* Record SYN headers for new

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connections. */

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#define TCP_SAVED_SYN 28 /* Get SYN headers recorded for

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connection. */

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#define TCP_REPAIR_WINDOW 29 /* Get/set window parameters. */

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#define TCP_FASTOPEN_CONNECT 30 /* Attempt FastOpen with connect. */

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#define TCP_ULP 31 /* Attach a ULP to a TCP connection. */

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#define TCP_MD5SIG_EXT 32 /* TCP MD5 Signature with extensions. */

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#define TCP_FASTOPEN_KEY 33 /* Set the key for Fast Open (cookie). */

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#define TCP_FASTOPEN_NO_COOKIE 34 /* Enable TFO without a TFO cookie. */

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#ifdef __USE_MISC

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# include <sys/types.h>

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# include <sys/socket.h>

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# include <stdint.h>

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typedef uint32_t tcp_seq;

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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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{

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__extension__ union

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{

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struct

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{

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uint16_t th_sport; /* source port */

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uint16_t 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 __BYTE_ORDER == __LITTLE_ENDIAN

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uint8_t th_x2:4; /* (unused) */

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uint8_t th_off:4; /* data offset */

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# endif

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# if __BYTE_ORDER == __BIG_ENDIAN

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uint8_t th_off:4; /* data offset */

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uint8_t th_x2:4; /* (unused) */

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# endif

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uint8_t 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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uint16_t th_win; /* window */

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uint16_t th_sum; /* checksum */

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uint16_t th_urp; /* urgent pointer */

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};

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struct

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{

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uint16_t source;

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uint16_t dest;

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uint32_t seq;

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uint32_t ack_seq;

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# if __BYTE_ORDER == __LITTLE_ENDIAN

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uint16_t res1:4;

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uint16_t doff:4;

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uint16_t fin:1;

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uint16_t syn:1;

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uint16_t rst:1;

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uint16_t psh:1;

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uint16_t ack:1;

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uint16_t urg:1;

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uint16_t res2:2;

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# elif __BYTE_ORDER == __BIG_ENDIAN

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uint16_t doff:4;

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uint16_t res1:4;

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uint16_t res2:2;

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uint16_t urg:1;

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uint16_t ack:1;

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uint16_t psh:1;

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uint16_t rst:1;

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uint16_t syn:1;

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uint16_t fin:1;

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# else

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# error "Adjust your <bits/endian.h> defines"

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# endif

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uint16_t window;

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uint16_t check;

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uint16_t urg_ptr;

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};

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};

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};

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enum

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{

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TCP_ESTABLISHED = 1,

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TCP_SYN_SENT,

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TCP_SYN_RECV,

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TCP_FIN_WAIT1,

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TCP_FIN_WAIT2,

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TCP_TIME_WAIT,

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TCP_CLOSE,

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TCP_CLOSE_WAIT,

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TCP_LAST_ACK,

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TCP_LISTEN,

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TCP_CLOSING /* now a valid state */

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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 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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/*

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* Default maximum segment size for TCP.

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* With an IP MSS 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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# define TCP_MAXWIN 65535 /* largest value for (unscaled) window */

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# define TCP_MAX_WINSHIFT 14 /* maximum window shift */

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# define SOL_TCP 6 /* TCP level */

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# define TCPI_OPT_TIMESTAMPS 1

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# define TCPI_OPT_SACK 2

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# define TCPI_OPT_WSCALE 4

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# define TCPI_OPT_ECN 8 /* ECN was negociated at TCP session init */

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# define TCPI_OPT_ECN_SEEN 16 /* we received at least one packet with ECT */

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# define TCPI_OPT_SYN_DATA 32 /* SYN-ACK acked data in SYN sent or rcvd */

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/* Values for tcpi_state. */

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enum tcp_ca_state

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{

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TCP_CA_Open = 0,

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TCP_CA_Disorder = 1,

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TCP_CA_CWR = 2,

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TCP_CA_Recovery = 3,

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TCP_CA_Loss = 4

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};

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struct tcp_info

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{

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uint8_t tcpi_state;

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uint8_t tcpi_ca_state;

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uint8_t tcpi_retransmits;

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uint8_t tcpi_probes;

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uint8_t tcpi_backoff;

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uint8_t tcpi_options;

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uint8_t tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;

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uint32_t tcpi_rto;

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uint32_t tcpi_ato;

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uint32_t tcpi_snd_mss;

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uint32_t tcpi_rcv_mss;

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uint32_t tcpi_unacked;

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uint32_t tcpi_sacked;

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uint32_t tcpi_lost;

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uint32_t tcpi_retrans;

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uint32_t tcpi_fackets;

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/* Times. */

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uint32_t tcpi_last_data_sent;

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uint32_t tcpi_last_ack_sent; /* Not remembered, sorry. */

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uint32_t tcpi_last_data_recv;

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uint32_t tcpi_last_ack_recv;

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/* Metrics. */

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uint32_t tcpi_pmtu;

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uint32_t tcpi_rcv_ssthresh;

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uint32_t tcpi_rtt;

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uint32_t tcpi_rttvar;

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uint32_t tcpi_snd_ssthresh;

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uint32_t tcpi_snd_cwnd;

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uint32_t tcpi_advmss;

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uint32_t tcpi_reordering;

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uint32_t tcpi_rcv_rtt;

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uint32_t tcpi_rcv_space;

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uint32_t tcpi_total_retrans;

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};

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/* For TCP_MD5SIG socket option. */

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#define TCP_MD5SIG_MAXKEYLEN 80

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/* tcp_md5sig extension flags for TCP_MD5SIG_EXT. */

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#define TCP_MD5SIG_FLAG_PREFIX 1 /* Address prefix length. */

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struct tcp_md5sig

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{

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struct sockaddr_storage tcpm_addr; /* Address associated. */

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uint8_t tcpm_flags; /* Extension flags. */

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uint8_t tcpm_prefixlen; /* Address prefix. */

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uint16_t tcpm_keylen; /* Key length. */

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uint32_t __tcpm_pad; /* Zero. */

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uint8_t tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* Key (binary). */

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};

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/* For socket repair options. */

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struct tcp_repair_opt

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{

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uint32_t opt_code;

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uint32_t opt_val;

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};

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/* Queue to repair, for TCP_REPAIR_QUEUE. */

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enum

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{

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TCP_NO_QUEUE,

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TCP_RECV_QUEUE,

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TCP_SEND_QUEUE,

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TCP_QUEUES_NR,

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};

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/* For cookie transactions socket options. */

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#define TCP_COOKIE_MIN 8 /* 64-bits */

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#define TCP_COOKIE_MAX 16 /* 128-bits */

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#define TCP_COOKIE_PAIR_SIZE (2*TCP_COOKIE_MAX)

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/* Flags for both getsockopt and setsockopt */

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#define TCP_COOKIE_IN_ALWAYS (1 << 0) /* Discard SYN without cookie */

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#define TCP_COOKIE_OUT_NEVER (1 << 1) /* Prohibit outgoing cookies,

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* supercedes everything. */

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/* Flags for getsockopt */

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#define TCP_S_DATA_IN (1 << 2) /* Was data received? */

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#define TCP_S_DATA_OUT (1 << 3) /* Was data sent? */

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#define TCP_MSS_DEFAULT 536U /* IPv4 (RFC1122, RFC2581) */

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#define TCP_MSS_DESIRED 1220U /* IPv6 (tunneled), EDNS0 (RFC3226) */

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struct tcp_cookie_transactions

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{

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uint16_t tcpct_flags;

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uint8_t __tcpct_pad1;

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uint8_t tcpct_cookie_desired;

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uint16_t tcpct_s_data_desired;

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uint16_t tcpct_used;

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uint8_t tcpct_value[TCP_MSS_DEFAULT];

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};

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/* For use with TCP_REPAIR_WINDOW. */

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struct tcp_repair_window

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{

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uint32_t snd_wl1;

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uint32_t snd_wnd;

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uint32_t max_window;

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uint32_t rcv_wnd;

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uint32_t rcv_wup;

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};

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#endif /* Misc. */

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#endif /* netinet/tcp.h */

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