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304 lines
8.7 KiB
C
304 lines
8.7 KiB
C
/*
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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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#ifdef __USE_MISC
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# include <sys/types.h>
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# include <sys/socket.h>
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typedef u_int32_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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u_int16_t th_sport; /* source port */
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u_int16_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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u_int8_t th_x2:4; /* (unused) */
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u_int8_t th_off:4; /* data offset */
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# endif
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# if __BYTE_ORDER == __BIG_ENDIAN
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u_int8_t th_off:4; /* data offset */
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u_int8_t th_x2:4; /* (unused) */
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# endif
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u_int8_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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u_int16_t th_win; /* window */
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u_int16_t th_sum; /* checksum */
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u_int16_t th_urp; /* urgent pointer */
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};
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struct
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{
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u_int16_t source;
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u_int16_t dest;
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u_int32_t seq;
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u_int32_t ack_seq;
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# if __BYTE_ORDER == __LITTLE_ENDIAN
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u_int16_t res1:4;
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u_int16_t doff:4;
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u_int16_t fin:1;
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u_int16_t syn:1;
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u_int16_t rst:1;
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u_int16_t psh:1;
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u_int16_t ack:1;
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u_int16_t urg:1;
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u_int16_t res2:2;
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# elif __BYTE_ORDER == __BIG_ENDIAN
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u_int16_t doff:4;
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u_int16_t res1:4;
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u_int16_t res2:2;
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u_int16_t urg:1;
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u_int16_t ack:1;
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u_int16_t psh:1;
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u_int16_t rst:1;
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u_int16_t syn:1;
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u_int16_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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u_int16_t window;
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u_int16_t check;
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u_int16_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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u_int8_t tcpi_state;
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u_int8_t tcpi_ca_state;
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u_int8_t tcpi_retransmits;
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u_int8_t tcpi_probes;
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u_int8_t tcpi_backoff;
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u_int8_t tcpi_options;
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u_int8_t tcpi_snd_wscale : 4, tcpi_rcv_wscale : 4;
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u_int32_t tcpi_rto;
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u_int32_t tcpi_ato;
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u_int32_t tcpi_snd_mss;
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u_int32_t tcpi_rcv_mss;
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u_int32_t tcpi_unacked;
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u_int32_t tcpi_sacked;
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u_int32_t tcpi_lost;
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u_int32_t tcpi_retrans;
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u_int32_t tcpi_fackets;
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/* Times. */
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u_int32_t tcpi_last_data_sent;
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u_int32_t tcpi_last_ack_sent; /* Not remembered, sorry. */
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u_int32_t tcpi_last_data_recv;
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u_int32_t tcpi_last_ack_recv;
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/* Metrics. */
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u_int32_t tcpi_pmtu;
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u_int32_t tcpi_rcv_ssthresh;
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u_int32_t tcpi_rtt;
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u_int32_t tcpi_rttvar;
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u_int32_t tcpi_snd_ssthresh;
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u_int32_t tcpi_snd_cwnd;
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u_int32_t tcpi_advmss;
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u_int32_t tcpi_reordering;
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u_int32_t tcpi_rcv_rtt;
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u_int32_t tcpi_rcv_space;
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u_int32_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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struct tcp_md5sig
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{
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struct sockaddr_storage tcpm_addr; /* Address associated. */
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u_int16_t __tcpm_pad1; /* Zero. */
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u_int16_t tcpm_keylen; /* Key length. */
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u_int32_t __tcpm_pad2; /* Zero. */
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u_int8_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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u_int32_t opt_code;
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u_int32_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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u_int16_t tcpct_flags;
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u_int8_t __tcpct_pad1;
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u_int8_t tcpct_cookie_desired;
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u_int16_t tcpct_s_data_desired;
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u_int16_t tcpct_used;
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u_int8_t tcpct_value[TCP_MSS_DEFAULT];
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};
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#endif /* Misc. */
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#endif /* netinet/tcp.h */
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