213 lines
7.1 KiB
C
213 lines
7.1 KiB
C
/* $NetBSD: tcp.h,v 1.33 2017/01/10 20:32:27 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1982, 1986, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)tcp.h 8.1 (Berkeley) 6/10/93
|
|
*/
|
|
|
|
#ifndef _NETINET_TCP_H_
|
|
#define _NETINET_TCP_H_
|
|
|
|
#include <sys/featuretest.h>
|
|
|
|
#if defined(_NETBSD_SOURCE)
|
|
#include <sys/types.h>
|
|
|
|
typedef uint32_t tcp_seq;
|
|
/*
|
|
* TCP header.
|
|
* Per RFC 793, September, 1981.
|
|
* Updated by RFC 3168, September, 2001.
|
|
*/
|
|
struct tcphdr {
|
|
uint16_t th_sport; /* source port */
|
|
uint16_t th_dport; /* destination port */
|
|
tcp_seq th_seq; /* sequence number */
|
|
tcp_seq th_ack; /* acknowledgement number */
|
|
#if BYTE_ORDER == LITTLE_ENDIAN
|
|
/*LINTED non-portable bitfields*/
|
|
uint8_t th_x2:4, /* (unused) */
|
|
th_off:4; /* data offset */
|
|
#endif
|
|
#if BYTE_ORDER == BIG_ENDIAN
|
|
/*LINTED non-portable bitfields*/
|
|
uint8_t th_off:4, /* data offset */
|
|
th_x2:4; /* (unused) */
|
|
#endif
|
|
uint8_t th_flags;
|
|
#define TH_FIN 0x01
|
|
#define TH_SYN 0x02
|
|
#define TH_RST 0x04
|
|
#define TH_PUSH 0x08
|
|
#define TH_ACK 0x10
|
|
#define TH_URG 0x20
|
|
#define TH_ECE 0x40
|
|
#define TH_CWR 0x80
|
|
uint16_t th_win; /* window */
|
|
uint16_t th_sum; /* checksum */
|
|
uint16_t th_urp; /* urgent pointer */
|
|
} __packed;
|
|
|
|
#define TCPOPT_EOL 0
|
|
#define TCPOLEN_EOL 1
|
|
#define TCPOPT_PAD 0
|
|
#define TCPOLEN_PAD 1
|
|
#define TCPOPT_NOP 1
|
|
#define TCPOLEN_NOP 1
|
|
#define TCPOPT_MAXSEG 2
|
|
#define TCPOLEN_MAXSEG 4
|
|
#define TCPOPT_WINDOW 3
|
|
#define TCPOLEN_WINDOW 3
|
|
#define TCPOPT_SACK_PERMITTED 4 /* Experimental */
|
|
#define TCPOLEN_SACK_PERMITTED 2
|
|
#define TCPOPT_SACK 5 /* Experimental */
|
|
#define TCPOPT_TIMESTAMP 8
|
|
#define TCPOLEN_TIMESTAMP 10
|
|
#define TCPOLEN_TSTAMP_APPA (TCPOLEN_TIMESTAMP+2) /* appendix A */
|
|
|
|
#define TCPOPT_TSTAMP_HDR \
|
|
(TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
|
|
|
|
#define TCPOPT_SIGNATURE 19 /* Keyed MD5: RFC 2385 */
|
|
#define TCPOLEN_SIGNATURE 18
|
|
#define TCPOLEN_SIGLEN (TCPOLEN_SIGNATURE+2) /* padding */
|
|
|
|
#define MAX_TCPOPTLEN 40 /* max # bytes that go in options */
|
|
|
|
/*
|
|
* Default maximum segment size for TCP.
|
|
* This is defined by RFC 1112 Sec 4.2.2.6.
|
|
*/
|
|
#define TCP_MSS 536
|
|
|
|
#define TCP_MINMSS 216
|
|
|
|
#define TCP_MAXWIN 65535 /* largest value for (unscaled) window */
|
|
|
|
#define TCP_MAX_WINSHIFT 14 /* maximum window shift */
|
|
|
|
#define TCP_MAXBURST 4 /* maximum segments in a burst */
|
|
|
|
#endif /* _NETBSD_SOURCE */
|
|
|
|
/*
|
|
* User-settable options (used with setsockopt).
|
|
*/
|
|
#define TCP_NODELAY 1 /* don't delay send to coalesce packets */
|
|
#define TCP_MAXSEG 2 /* set maximum segment size */
|
|
#define TCP_KEEPIDLE 3
|
|
#ifdef notyet
|
|
#define TCP_NOPUSH 4 /* reserved for FreeBSD compat */
|
|
#endif
|
|
#define TCP_KEEPINTVL 5
|
|
#define TCP_KEEPCNT 6
|
|
#define TCP_KEEPINIT 7
|
|
#ifdef notyet
|
|
#define TCP_NOOPT 8 /* reserved for FreeBSD compat */
|
|
#endif
|
|
#define TCP_INFO 9 /* retrieve tcp_info structure */
|
|
#define TCP_MD5SIG 0x10 /* use MD5 digests (RFC2385) */
|
|
#define TCP_CONGCTL 0x20 /* selected congestion control */
|
|
|
|
#define TCPI_OPT_TIMESTAMPS 0x01
|
|
#define TCPI_OPT_SACK 0x02
|
|
#define TCPI_OPT_WSCALE 0x04
|
|
#define TCPI_OPT_ECN 0x08
|
|
#define TCPI_OPT_TOE 0x10
|
|
|
|
/*
|
|
* The TCP_INFO socket option comes from the Linux 2.6 TCP API, and permits
|
|
* the caller to query certain information about the state of a TCP
|
|
* connection. We provide an overlapping set of fields with the Linux
|
|
* implementation, but since this is a fixed size structure, room has been
|
|
* left for growth. In order to maximize potential future compatibility with
|
|
* the Linux API, the same variable names and order have been adopted, and
|
|
* padding left to make room for omitted fields in case they are added later.
|
|
*
|
|
* XXX: This is currently an unstable ABI/API, in that it is expected to
|
|
* change.
|
|
*/
|
|
struct tcp_info {
|
|
uint8_t tcpi_state; /* TCP FSM state. */
|
|
uint8_t __tcpi_ca_state;
|
|
uint8_t __tcpi_retransmits;
|
|
uint8_t __tcpi_probes;
|
|
uint8_t __tcpi_backoff;
|
|
uint8_t tcpi_options; /* Options enabled on conn. */
|
|
/*LINTED: non-portable bitfield*/
|
|
uint8_t tcpi_snd_wscale:4, /* RFC1323 send shift value. */
|
|
/*LINTED: non-portable bitfield*/
|
|
tcpi_rcv_wscale:4; /* RFC1323 recv shift value. */
|
|
|
|
uint32_t tcpi_rto; /* Retransmission timeout (usec). */
|
|
uint32_t __tcpi_ato;
|
|
uint32_t tcpi_snd_mss; /* Max segment size for send. */
|
|
uint32_t tcpi_rcv_mss; /* Max segment size for receive. */
|
|
|
|
uint32_t __tcpi_unacked;
|
|
uint32_t __tcpi_sacked;
|
|
uint32_t __tcpi_lost;
|
|
uint32_t __tcpi_retrans;
|
|
uint32_t __tcpi_fackets;
|
|
|
|
/* Times; measurements in usecs. */
|
|
uint32_t __tcpi_last_data_sent;
|
|
uint32_t __tcpi_last_ack_sent; /* Also unimpl. on Linux? */
|
|
uint32_t tcpi_last_data_recv; /* Time since last recv data. */
|
|
uint32_t __tcpi_last_ack_recv;
|
|
|
|
/* Metrics; variable units. */
|
|
uint32_t __tcpi_pmtu;
|
|
uint32_t __tcpi_rcv_ssthresh;
|
|
uint32_t tcpi_rtt; /* Smoothed RTT in usecs. */
|
|
uint32_t tcpi_rttvar; /* RTT variance in usecs. */
|
|
uint32_t tcpi_snd_ssthresh; /* Slow start threshold. */
|
|
uint32_t tcpi_snd_cwnd; /* Send congestion window. */
|
|
uint32_t __tcpi_advmss;
|
|
uint32_t __tcpi_reordering;
|
|
|
|
uint32_t __tcpi_rcv_rtt;
|
|
uint32_t tcpi_rcv_space; /* Advertised recv window. */
|
|
|
|
/* FreeBSD/NetBSD extensions to tcp_info. */
|
|
uint32_t tcpi_snd_wnd; /* Advertised send window. */
|
|
uint32_t tcpi_snd_bwnd; /* No longer used. */
|
|
uint32_t tcpi_snd_nxt; /* Next egress seqno */
|
|
uint32_t tcpi_rcv_nxt; /* Next ingress seqno */
|
|
uint32_t tcpi_toe_tid; /* HWTID for TOE endpoints */
|
|
uint32_t tcpi_snd_rexmitpack; /* Retransmitted packets */
|
|
uint32_t tcpi_rcv_ooopack; /* Out-of-order packets */
|
|
uint32_t tcpi_snd_zerowin; /* Zero-sized windows sent */
|
|
|
|
/* Padding to grow without breaking ABI. */
|
|
uint32_t __tcpi_pad[26]; /* Padding. */
|
|
};
|
|
|
|
#endif /* !_NETINET_TCP_H_ */
|