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tcp.h

/*
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. 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     u_int32_t   tcp_seq;

#define      PR_SLOWHZ       2               /* 2 slow timeouts per second (approx) */
#define      PR_FASTHZ       5               /* 5 fast timeouts per second (not important) */

extern struct socket *tcp_last_so;

#define TCP_SNDSPACE 8192
#define TCP_RCVSPACE 8192

/*
 * TCP header.
 * Per RFC 793, September, 1981.
 */
struct tcphdr {
      u_int16_t   th_sport;         /* source port */
      u_int16_t   th_dport;         /* destination port */
      tcp_seq     th_seq;                 /* sequence number */
      tcp_seq     th_ack;                 /* acknowledgement number */
#ifdef WORDS_BIGENDIAN
      u_int th_off:4,         /* data offset */
            th_x2:4;          /* (unused) */
#else
      u_int th_x2:4,          /* (unused) */
            th_off:4;         /* data offset */
#endif
      u_int8_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
      u_int16_t   th_win;                 /* window */
      u_int16_t   th_sum;                 /* checksum */
      u_int16_t   th_urp;                 /* urgent pointer */
};

#include "tcp_var.h"

#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)

/*
 * 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.
 */
#define     TCP_MSS     1460

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

#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
/* #define  TCP_MAXSEG  0x02 */     /* set maximum segment size */

/*
 * 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 */

extern tcp_seq tcp_iss;                /* tcp initial send seq # */

extern const char * const tcpstates[];

#endif

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