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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. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *	@(#)tcp.h	8.1 (Berkeley) 6/10/93
     34  * tcp.h,v 1.3 1994/08/21 05:27:34 paul Exp
     35  */
     36 
     37 #ifndef _TCP_H_
     38 #define _TCP_H_
     39 
     40 #include "helper.h"
     41 
     42 typedef	u_int32_t	tcp_seq;
     43 
     44 #define      PR_SLOWHZ       2               /* 2 slow timeouts per second (approx) */
     45 #define      PR_FASTHZ       5               /* 5 fast timeouts per second (not important) */
     46 
     47 extern struct socket *tcp_last_so;
     48 
     49 #define TCP_SNDSPACE 8192
     50 #define TCP_RCVSPACE 8192
     51 
     52 /*
     53  * TCP header.
     54  * Per RFC 793, September, 1981.
     55  */
     56 struct tcphdr {
     57 	port_t	th_sport;		/* source port */
     58 	port_t	th_dport;		/* destination port */
     59 	tcp_seq	th_seq;			/* sequence number */
     60 	tcp_seq	th_ack;			/* acknowledgement number */
     61 #ifdef HOST_WORDS_BIGENDIAN
     62 	u_int	th_off:4,		/* data offset */
     63 		th_x2:4;		/* (unused) */
     64 #else
     65 	u_int	th_x2:4,		/* (unused) */
     66 		th_off:4;		/* data offset */
     67 #endif
     68 	u_int8_t	th_flags;
     69 #define	TH_FIN	0x01
     70 #define	TH_SYN	0x02
     71 #define	TH_RST	0x04
     72 #define	TH_PUSH	0x08
     73 #define	TH_ACK	0x10
     74 #define	TH_URG	0x20
     75 	u_int16_t	th_win;			/* window */
     76 	u_int16_t	th_sum;			/* checksum */
     77 	u_int16_t	th_urp;			/* urgent pointer */
     78 };
     79 
     80 #include "tcp_var.h"
     81 
     82 #define	TCPOPT_EOL		0
     83 #define	TCPOPT_NOP		1
     84 #define	TCPOPT_MAXSEG		2
     85 #define    TCPOLEN_MAXSEG		4
     86 #define TCPOPT_WINDOW		3
     87 #define    TCPOLEN_WINDOW		3
     88 #define TCPOPT_SACK_PERMITTED	4		/* Experimental */
     89 #define    TCPOLEN_SACK_PERMITTED	2
     90 #define TCPOPT_SACK		5		/* Experimental */
     91 #define TCPOPT_TIMESTAMP	8
     92 #define    TCPOLEN_TIMESTAMP		10
     93 #define    TCPOLEN_TSTAMP_APPA		(TCPOLEN_TIMESTAMP+2) /* appendix A */
     94 
     95 #define TCPOPT_TSTAMP_HDR	\
     96     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
     97 
     98 /*
     99  * Default maximum segment size for TCP.
    100  * With an IP MSS of 576, this is 536,
    101  * but 512 is probably more convenient.
    102  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
    103  *
    104  * We make this 1460 because we only care about Ethernet in the qemu context.
    105  */
    106 #define	TCP_MSS	1460
    107 
    108 #define	TCP_MAXWIN	65535	/* largest value for (unscaled) window */
    109 
    110 #define TCP_MAX_WINSHIFT	14	/* maximum window shift */
    111 
    112 /*
    113  * User-settable options (used with setsockopt).
    114  */
    115 #undef  TCP_NODELAY
    116 #define	TCP_NODELAY	0x01	/* don't delay send to coalesce packets */
    117 #undef  TCP_MAXSEG
    118 /* #define	TCP_MAXSEG	0x02 */	/* set maximum segment size */
    119 
    120 /*
    121  * TCP FSM state definitions.
    122  * Per RFC793, September, 1981.
    123  */
    124 
    125 #define TCP_NSTATES     11
    126 
    127 #define TCPS_CLOSED             0       /* closed */
    128 #define TCPS_LISTEN             1       /* listening for connection */
    129 #define TCPS_SYN_SENT           2       /* active, have sent syn */
    130 #define TCPS_SYN_RECEIVED       3       /* have send and received syn */
    131 /* states < TCPS_ESTABLISHED are those where connections not established */
    132 #define TCPS_ESTABLISHED        4       /* established */
    133 #define TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */
    134 /* states > TCPS_CLOSE_WAIT are those where user has closed */
    135 #define TCPS_FIN_WAIT_1         6       /* have closed, sent fin */
    136 #define TCPS_CLOSING            7       /* closed xchd FIN; await FIN ACK */
    137 #define TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */
    138 /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
    139 #define TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */
    140 #define TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */
    141 
    142 #define TCPS_HAVERCVDSYN(s)     ((s) >= TCPS_SYN_RECEIVED)
    143 #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
    144 #define TCPS_HAVERCVDFIN(s)     ((s) >= TCPS_TIME_WAIT)
    145 
    146 /*
    147  * TCP sequence numbers are 32 bit integers operated
    148  * on with modular arithmetic.  These macros can be
    149  * used to compare such integers.
    150  */
    151 #define SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
    152 #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
    153 #define SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
    154 #define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
    155 
    156 /*
    157  * Macros to initialize tcp sequence numbers for
    158  * send and receive from initial send and receive
    159  * sequence numbers.
    160  */
    161 #define tcp_rcvseqinit(tp) \
    162      (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
    163 
    164 #define tcp_sendseqinit(tp) \
    165     (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss
    166 
    167 #define TCP_ISSINCR     (125*1024)      /* increment for tcp_iss each second */
    168 
    169 extern tcp_seq tcp_iss;                /* tcp initial send seq # */
    170 
    171 extern const char * const tcpstates[];
    172 
    173 #endif
    174