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/*

 * 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

 * tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp

 */

#ifndef _TCP_H_

#define _TCP_H_

typedef        uint32_t tcp_seq;

#define      PR_SLOWHZ       2               /* 2 slow timeouts per second (approx) */

#define      PR_FASTHZ       5               /* 5 fast timeouts per second (not important) */

#define TCP_SNDSPACE 8192

#define TCP_RCVSPACE 8192

/*

 * TCP header.

 * Per RFC 793, September, 1981.

 */

#define tcphdr slirp_tcphdr

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 */

#ifdef HOST_WORDS_BIGENDIAN

        uint8_t        th_off:4,                /* data offset */

                th_x2:4;                /* (unused) */

#else

        uint8_t        th_x2:4,                /* (unused) */

                th_off:4;                /* data offset */

#endif

        uint8_t th_flags;

        uint16_t th_win;                /* window */

        uint16_t th_sum;                /* checksum */

        uint16_t th_urp;                /* urgent pointer */

};

#include "tcp_var.h"

#ifndef TH_FIN

#define        TH_FIN        0x01

#define        TH_SYN        0x02

#define        TH_RST        0x04

#define        TH_PUSH        0x08

#define        TH_ACK        0x10

#define        TH_URG        0x20

#endif

#ifndef TCPOPT_EOL

#define        TCPOPT_EOL                0

#define        TCPOPT_NOP                1

#define        TCPOPT_MAXSEG                2

#define TCPOPT_WINDOW                3

#define TCPOPT_SACK_PERMITTED        4                /* Experimental */

#define TCPOPT_SACK                5                /* Experimental */

#define TCPOPT_TIMESTAMP        8

#define TCPOPT_TSTAMP_HDR        \

    (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)

#endif

#ifndef TCPOLEN_MAXSEG

#define    TCPOLEN_MAXSEG                4

#define    TCPOLEN_WINDOW                3

#define    TCPOLEN_SACK_PERMITTED        2

#define    TCPOLEN_TIMESTAMP                10

#define    TCPOLEN_TSTAMP_APPA                (TCPOLEN_TIMESTAMP+2) /* appendix A */

#endif

/*

 * Default maximum segment size for TCP.

 * With an IP MSS of 576, this is 536,

 * but 512 is probably more convenient.

 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).

 *

 * We make this 1460 because we only care about Ethernet in the qemu context.

 */

#undef TCP_MSS

#define        TCP_MSS        1460

#undef TCP_MAXWIN

#define        TCP_MAXWIN        65535        /* largest value for (unscaled) window */

#undef TCP_MAX_WINSHIFT

#define TCP_MAX_WINSHIFT        14        /* maximum window shift */

/*

 * User-settable options (used with setsockopt).

 *

 * We don't use the system headers on unix because we have conflicting

 * local structures. We can't avoid the system definitions on Windows,

 * so we undefine them.

 */

#undef TCP_NODELAY

#define        TCP_NODELAY        0x01        /* don't delay send to coalesce packets */

#undef TCP_MAXSEG

/*

 * TCP FSM state definitions.

 * Per RFC793, September, 1981.

 */

#define TCP_NSTATES     11

#define TCPS_CLOSED             0       /* closed */

#define TCPS_LISTEN             1       /* listening for connection */

#define TCPS_SYN_SENT           2       /* active, have sent syn */

#define TCPS_SYN_RECEIVED       3       /* have send and received syn */

/* states < TCPS_ESTABLISHED are those where connections not established */

#define TCPS_ESTABLISHED        4       /* established */

#define TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */

/* states > TCPS_CLOSE_WAIT are those where user has closed */

#define TCPS_FIN_WAIT_1         6       /* have closed, sent fin */

#define TCPS_CLOSING            7       /* closed xchd FIN; await FIN ACK */

#define TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */

/* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */

#define TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */

#define TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */

#define TCPS_HAVERCVDSYN(s)     ((s) >= TCPS_SYN_RECEIVED)

#define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)

#define TCPS_HAVERCVDFIN(s)     ((s) >= TCPS_TIME_WAIT)

/*

 * TCP sequence numbers are 32 bit integers operated

 * on with modular arithmetic.  These macros can be

 * used to compare such integers.

 */

#define SEQ_LT(a,b)     ((int)((a)-(b)) < 0)

#define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)

#define SEQ_GT(a,b)     ((int)((a)-(b)) > 0)

#define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)

/*

 * Macros to initialize tcp sequence numbers for

 * send and receive from initial send and receive

 * sequence numbers.

 */

#define tcp_rcvseqinit(tp) \

     (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1

#define tcp_sendseqinit(tp) \

    (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss

#define TCP_ISSINCR     (125*1024)      /* increment for tcp_iss each second */

#endif