223 lines
7.6 KiB
C
223 lines
7.6 KiB
C
/* $OpenBSD: tcp.h,v 1.24 2023/05/19 01:04:39 guenther Exp $ */
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/* $NetBSD: tcp.h,v 1.8 1995/04/17 05:32:58 cgd Exp $ */
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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. 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_
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#include <sys/cdefs.h>
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#if __BSD_VISIBLE
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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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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_int32_t th_x2:4, /* (unused) */
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th_off:4; /* data offset */
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#endif
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#if _BYTE_ORDER == _BIG_ENDIAN
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u_int32_t th_off:4, /* data offset */
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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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#define TH_ECE 0x40
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#define TH_CWR 0x80
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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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#define th_reseqlen th_urp /* TCP data length for
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resequencing/reassembly */
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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 /* 2*sizeof(tcp_seq) */
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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_SIGNATURE 19
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#define TCPOLEN_SIGNATURE 18
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#define TCPOLEN_SIGLEN (TCPOLEN_SIGNATURE+2) /* padding */
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#define MAX_TCPOPTLEN 40 /* Absolute maximum TCP options len */
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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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/* 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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#define TCP_MAX_SACK 3 /* Max # SACKs sent in any segment */
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#define TCP_SACKHOLE_LIMIT 128 /* Max # SACK holes per connection */
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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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/*
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* The TCP_INFO socket option comes from the Linux 2.6 TCP API, and permits
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* the caller to query certain information about the state of a TCP
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* connection. Provide an overlapping set of fields with the Linux
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* implementation, but at the same time add a lot of OpenBSD specific
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* extra information.
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*/
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struct tcp_info {
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uint8_t tcpi_state; /* TCP FSM 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; /* Options enabled on conn. */
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#define TCPI_OPT_TIMESTAMPS 0x01
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#define TCPI_OPT_SACK 0x02
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#define TCPI_OPT_WSCALE 0x04
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#define TCPI_OPT_ECN 0x08
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#define TCPI_OPT_TOE 0x10
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uint8_t tcpi_snd_wscale; /* RFC1323 send shift value. */
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uint8_t tcpi_rcv_wscale; /* RFC1323 recv shift value. */
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uint32_t tcpi_rto; /* Retransmission timeout (usec). */
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uint32_t __tcpi_ato;
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uint32_t tcpi_snd_mss; /* Max segment size for send. */
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uint32_t tcpi_rcv_mss; /* Max segment size for recv. */
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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; measurements in usecs. */
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uint32_t tcpi_last_data_sent; /* since last sent data. */
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uint32_t tcpi_last_ack_sent; /* since last sent ack. */
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uint32_t tcpi_last_data_recv; /* since last recv data. */
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uint32_t tcpi_last_ack_recv; /* since last recv ack. */
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/* Metrics; variable units. */
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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; /* Smoothed RTT in usecs. */
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uint32_t tcpi_rttvar; /* RTT variance in usecs. */
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uint32_t tcpi_snd_ssthresh; /* Slow start threshold. */
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uint32_t tcpi_snd_cwnd; /* Send congestion window. */
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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; /* Advertised recv window. */
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/*
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* Members below this point are only set if process is privileged,
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* otherwise values will be 0.
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*/
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/* FreeBSD/NetBSD extensions to tcp_info. */
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uint32_t tcpi_snd_wnd; /* Advertised send window. */
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uint32_t tcpi_snd_nxt; /* Next egress seqno */
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uint32_t tcpi_rcv_nxt; /* Next ingress seqno */
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uint32_t tcpi_toe_tid; /* HWTID for TOE endpoints */
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uint32_t tcpi_snd_rexmitpack; /* Retransmitted packets */
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uint32_t tcpi_rcv_ooopack; /* Out-of-order packets */
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uint32_t tcpi_snd_zerowin; /* Zero-sized windows sent */
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/* OpenBSD extensions */
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uint32_t tcpi_rttmin;
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uint32_t tcpi_max_sndwnd;
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uint32_t tcpi_rcv_adv;
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uint32_t tcpi_rcv_up;
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uint32_t tcpi_snd_una;
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uint32_t tcpi_snd_up;
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uint32_t tcpi_snd_wl1;
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uint32_t tcpi_snd_wl2;
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uint32_t tcpi_snd_max;
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uint32_t tcpi_ts_recent;
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uint32_t tcpi_ts_recent_age;
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uint32_t tcpi_rfbuf_cnt;
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uint32_t tcpi_rfbuf_ts;
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uint32_t tcpi_so_rcv_sb_cc;
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uint32_t tcpi_so_rcv_sb_hiwat;
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uint32_t tcpi_so_rcv_sb_lowat;
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uint32_t tcpi_so_rcv_sb_wat;
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uint32_t tcpi_so_snd_sb_cc;
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uint32_t tcpi_so_snd_sb_hiwat;
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uint32_t tcpi_so_snd_sb_lowat;
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uint32_t tcpi_so_snd_sb_wat;
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};
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#endif /* __BSD_VISIBLE */
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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 pkts */
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#define TCP_MAXSEG 0x02 /* set maximum segment size */
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#define TCP_MD5SIG 0x04 /* enable TCP MD5 signature option */
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#define TCP_SACK_ENABLE 0x08 /* enable SACKs (if disabled by def.) */
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#define TCP_INFO 0x09 /* retrieve tcp_info structure */
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#define TCP_NOPUSH 0x10 /* don't push last block of write */
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#endif /* _NETINET_TCP_H_ */
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