LCOM1920-T02G10

/*        $NetBSD: tcp.h,v 1.31 2015/02/14 12:57:53 he 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        TCPOPT_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. */

        uint8_t                tcpi_snd_wscale:4,        /* RFC1323 send shift value. */

                        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_ */