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    1: /*
    2:  * Copyright (c) 1982, 1986, 1993
    3:  *	The Regents of the University of California.  All rights reserved.
    4:  *
    5:  * Redistribution and use in source and binary forms, with or without
    6:  * modification, are permitted provided that the following conditions
    7:  * are met:
    8:  * 1. Redistributions of source code must retain the above copyright
    9:  *    notice, this list of conditions and the following disclaimer.
   10:  * 2. Redistributions in binary form must reproduce the above copyright
   11:  *    notice, this list of conditions and the following disclaimer in the
   12:  *    documentation and/or other materials provided with the distribution.
   13:  * 3. Neither the name of the University nor the names of its contributors
   14:  *    may be used to endorse or promote products derived from this software
   15:  *    without specific prior written permission.
   16:  *
   17:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27:  * SUCH DAMAGE.
   28:  *
   29:  *	@(#)tcp.h	8.1 (Berkeley) 6/10/93
   30:  * tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp
   31:  */
   32: 
   33: #ifndef _TCP_H_
   34: #define _TCP_H_
   35: 
   36: typedef	u_int32_t	tcp_seq;
   37: 
   38: #define      PR_SLOWHZ       2               /* 2 slow timeouts per second (approx) */
   39: #define      PR_FASTHZ       5               /* 5 fast timeouts per second (not important) */
   40: 
   41: #define TCP_SNDSPACE 8192
   42: #define TCP_RCVSPACE 8192
   43: 
   44: /*
   45:  * TCP header.
   46:  * Per RFC 793, September, 1981.
   47:  */
   48: struct tcphdr {
   49: 	u_int16_t	th_sport;		/* source port */
   50: 	u_int16_t	th_dport;		/* destination port */
   51: 	tcp_seq	th_seq;			/* sequence number */
   52: 	tcp_seq	th_ack;			/* acknowledgement number */
   53: #ifdef HOST_WORDS_BIGENDIAN
   54: 	u_int	th_off:4,		/* data offset */
   55: 		th_x2:4;		/* (unused) */
   56: #else
   57: 	u_int	th_x2:4,		/* (unused) */
   58: 		th_off:4;		/* data offset */
   59: #endif
   60: 	u_int8_t	th_flags;
   61: #define	TH_FIN	0x01
   62: #define	TH_SYN	0x02
   63: #define	TH_RST	0x04
   64: #define	TH_PUSH	0x08
   65: #define	TH_ACK	0x10
   66: #define	TH_URG	0x20
   67: 	u_int16_t	th_win;			/* window */
   68: 	u_int16_t	th_sum;			/* checksum */
   69: 	u_int16_t	th_urp;			/* urgent pointer */
   70: };
   71: 
   72: #include "tcp_var.h"
   73: 
   74: #define	TCPOPT_EOL		0
   75: #define	TCPOPT_NOP		1
   76: #define	TCPOPT_MAXSEG		2
   77: #define    TCPOLEN_MAXSEG		4
   78: #define TCPOPT_WINDOW		3
   79: #define    TCPOLEN_WINDOW		3
   80: #define TCPOPT_SACK_PERMITTED	4		/* Experimental */
   81: #define    TCPOLEN_SACK_PERMITTED	2
   82: #define TCPOPT_SACK		5		/* Experimental */
   83: #define TCPOPT_TIMESTAMP	8
   84: #define    TCPOLEN_TIMESTAMP		10
   85: #define    TCPOLEN_TSTAMP_APPA		(TCPOLEN_TIMESTAMP+2) /* appendix A */
   86: 
   87: #define TCPOPT_TSTAMP_HDR	\
   88:     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
   89: 
   90: /*
   91:  * Default maximum segment size for TCP.
   92:  * With an IP MSS of 576, this is 536,
   93:  * but 512 is probably more convenient.
   94:  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
   95:  *
   96:  * We make this 1460 because we only care about Ethernet in the qemu context.
   97:  */
   98: #define	TCP_MSS	1460
   99: 
  100: #define	TCP_MAXWIN	65535	/* largest value for (unscaled) window */
  101: 
  102: #define TCP_MAX_WINSHIFT	14	/* maximum window shift */
  103: 
  104: /*
  105:  * User-settable options (used with setsockopt).
  106:  *
  107:  * We don't use the system headers on unix because we have conflicting
  108:  * local structures. We can't avoid the system definitions on Windows,
  109:  * so we undefine them.
  110:  */
  111: #undef TCP_NODELAY
  112: #define	TCP_NODELAY	0x01	/* don't delay send to coalesce packets */
  113: #undef TCP_MAXSEG
  114: 
  115: /*
  116:  * TCP FSM state definitions.
  117:  * Per RFC793, September, 1981.
  118:  */
  119: 
  120: #define TCP_NSTATES     11
  121: 
  122: #define TCPS_CLOSED             0       /* closed */
  123: #define TCPS_LISTEN             1       /* listening for connection */
  124: #define TCPS_SYN_SENT           2       /* active, have sent syn */
  125: #define TCPS_SYN_RECEIVED       3       /* have send and received syn */
  126: /* states < TCPS_ESTABLISHED are those where connections not established */
  127: #define TCPS_ESTABLISHED        4       /* established */
  128: #define TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */
  129: /* states > TCPS_CLOSE_WAIT are those where user has closed */
  130: #define TCPS_FIN_WAIT_1         6       /* have closed, sent fin */
  131: #define TCPS_CLOSING            7       /* closed xchd FIN; await FIN ACK */
  132: #define TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */
  133: /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
  134: #define TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */
  135: #define TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */
  136: 
  137: #define TCPS_HAVERCVDSYN(s)     ((s) >= TCPS_SYN_RECEIVED)
  138: #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
  139: #define TCPS_HAVERCVDFIN(s)     ((s) >= TCPS_TIME_WAIT)
  140: 
  141: /*
  142:  * TCP sequence numbers are 32 bit integers operated
  143:  * on with modular arithmetic.  These macros can be
  144:  * used to compare such integers.
  145:  */
  146: #define SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
  147: #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
  148: #define SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
  149: #define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
  150: 
  151: /*
  152:  * Macros to initialize tcp sequence numbers for
  153:  * send and receive from initial send and receive
  154:  * sequence numbers.
  155:  */
  156: #define tcp_rcvseqinit(tp) \
  157:      (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
  158: 
  159: #define tcp_sendseqinit(tp) \
  160:     (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss
  161: 
  162: #define TCP_ISSINCR     (125*1024)      /* increment for tcp_iss each second */
  163: 
  164: #endif