216 lines
7.5 KiB
C
216 lines
7.5 KiB
C
/* $NetBSD: tcp.h,v 1.37 2021/02/03 18:13:13 roy 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/featuretest.h>
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#if defined(_NETBSD_SOURCE)
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#include <sys/types.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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* Updated by RFC 3168, September, 2001.
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*/
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struct tcphdr {
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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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/*LINTED non-portable bitfields*/
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uint8_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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/*LINTED non-portable bitfields*/
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uint8_t th_off:4, /* data offset */
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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 /* Final: Set on the last segment */
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#define TH_SYN 0x02 /* Synchronization: New conn with dst port */
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#define TH_RST 0x04 /* Reset: Announce to peer conn terminated */
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#define TH_PUSH 0x08 /* Push: Immediately send, don't buffer seg */
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#define TH_ACK 0x10 /* Acknowledge: Part of connection establish */
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#define TH_URG 0x20 /* Urgent: send special marked segment now */
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#define TH_ECE 0x40 /* ECN Echo */
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#define TH_CWR 0x80 /* Congestion Window Reduced */
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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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#ifdef __CTASSERT
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__CTASSERT(sizeof(struct tcphdr) == 20);
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#endif
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#define TCPOPT_EOL 0
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#define TCPOLEN_EOL 1
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#define TCPOPT_PAD 0
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#define TCPOLEN_PAD 1
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#define TCPOPT_NOP 1
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#define TCPOLEN_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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#define TCPOPT_SIGNATURE 19 /* Keyed MD5: RFC 2385 */
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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 /* max # bytes that go in options */
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/*
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* Default maximum segment size for TCP.
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* This is defined by RFC 1112 Sec 4.2.2.6.
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*/
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#define TCP_MSS 536
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#define TCP_MINMSS 216
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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 TCP_MAXBURST 4 /* maximum segments in a burst */
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#endif /* _NETBSD_SOURCE */
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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_KEEPIDLE 3
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#ifdef notyet
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#define TCP_NOPUSH 4 /* reserved for FreeBSD compat */
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#endif
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#define TCP_KEEPINTVL 5
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#define TCP_KEEPCNT 6
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#define TCP_KEEPINIT 7
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#ifdef notyet
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#define TCP_NOOPT 8 /* reserved for FreeBSD compat */
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#endif
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#define TCP_INFO 9 /* retrieve tcp_info structure */
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#define TCP_MD5SIG 0x10 /* use MD5 digests (RFC2385) */
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#define TCP_CONGCTL 0x20 /* selected congestion control */
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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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/*
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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. We provide an overlapping set of fields with the Linux
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* implementation, but since this is a fixed size structure, room has been
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* left for growth. In order to maximize potential future compatibility with
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* the Linux API, the same variable names and order have been adopted, and
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* padding left to make room for omitted fields in case they are added later.
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*
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* XXX: This is currently an unstable ABI/API, in that it is expected to
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* change.
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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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/*LINTED: non-portable bitfield*/
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uint8_t tcpi_snd_wscale:4, /* RFC1323 send shift value. */
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/*LINTED: non-portable bitfield*/
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tcpi_rcv_wscale:4; /* 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 receive. */
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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;
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uint32_t __tcpi_last_ack_sent; /* Also unimpl. on Linux? */
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uint32_t tcpi_last_data_recv; /* Time since last recv data. */
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uint32_t __tcpi_last_ack_recv;
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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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/* 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_bwnd; /* No longer used. */
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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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/* Padding to grow without breaking ABI. */
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uint32_t __tcpi_pad[26]; /* Padding. */
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};
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#endif /* !_NETINET_TCP_H_ */
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