File:  [Qemu by Fabrice Bellard] / qemu / slirp / tcp.h
Revision 1.1.1.10 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 19:51:32 2018 UTC (3 years, 3 months ago) by root
Branches: qemu, MAIN
CVS tags: qemu1101, HEAD
qemu 1.1.1

    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	uint32_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: #define tcphdr slirp_tcphdr
   49: struct tcphdr {
   50: 	uint16_t th_sport;              /* source port */
   51: 	uint16_t th_dport;              /* destination port */
   52: 	tcp_seq	th_seq;			/* sequence number */
   53: 	tcp_seq	th_ack;			/* acknowledgement number */
   54: #ifdef HOST_WORDS_BIGENDIAN
   55: 	uint8_t	th_off:4,		/* data offset */
   56: 		th_x2:4;		/* (unused) */
   57: #else
   58: 	uint8_t	th_x2:4,		/* (unused) */
   59: 		th_off:4;		/* data offset */
   60: #endif
   61: 	uint8_t th_flags;
   62: 	uint16_t th_win;                /* window */
   63: 	uint16_t th_sum;                /* checksum */
   64: 	uint16_t th_urp;                /* urgent pointer */
   65: };
   66: 
   67: #include "tcp_var.h"
   68: 
   69: #ifndef TH_FIN
   70: #define	TH_FIN	0x01
   71: #define	TH_SYN	0x02
   72: #define	TH_RST	0x04
   73: #define	TH_PUSH	0x08
   74: #define	TH_ACK	0x10
   75: #define	TH_URG	0x20
   76: #endif
   77: 
   78: #ifndef TCPOPT_EOL
   79: #define	TCPOPT_EOL		0
   80: #define	TCPOPT_NOP		1
   81: #define	TCPOPT_MAXSEG		2
   82: #define TCPOPT_WINDOW		3
   83: #define TCPOPT_SACK_PERMITTED	4		/* Experimental */
   84: #define TCPOPT_SACK		5		/* Experimental */
   85: #define TCPOPT_TIMESTAMP	8
   86: 
   87: #define TCPOPT_TSTAMP_HDR	\
   88:     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
   89: #endif
   90: 
   91: #ifndef TCPOLEN_MAXSEG
   92: #define    TCPOLEN_MAXSEG		4
   93: #define    TCPOLEN_WINDOW		3
   94: #define    TCPOLEN_SACK_PERMITTED	2
   95: #define    TCPOLEN_TIMESTAMP		10
   96: #define    TCPOLEN_TSTAMP_APPA		(TCPOLEN_TIMESTAMP+2) /* appendix A */
   97: #endif
   98: 
   99: /*
  100:  * Default maximum segment size for TCP.
  101:  * With an IP MSS of 576, this is 536,
  102:  * but 512 is probably more convenient.
  103:  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
  104:  *
  105:  * We make this 1460 because we only care about Ethernet in the qemu context.
  106:  */
  107: #undef TCP_MSS
  108: #define	TCP_MSS	1460
  109: 
  110: #undef TCP_MAXWIN
  111: #define	TCP_MAXWIN	65535	/* largest value for (unscaled) window */
  112: 
  113: #undef TCP_MAX_WINSHIFT
  114: #define TCP_MAX_WINSHIFT	14	/* maximum window shift */
  115: 
  116: /*
  117:  * User-settable options (used with setsockopt).
  118:  *
  119:  * We don't use the system headers on unix because we have conflicting
  120:  * local structures. We can't avoid the system definitions on Windows,
  121:  * so we undefine them.
  122:  */
  123: #undef TCP_NODELAY
  124: #define	TCP_NODELAY	0x01	/* don't delay send to coalesce packets */
  125: #undef TCP_MAXSEG
  126: 
  127: /*
  128:  * TCP FSM state definitions.
  129:  * Per RFC793, September, 1981.
  130:  */
  131: 
  132: #define TCP_NSTATES     11
  133: 
  134: #define TCPS_CLOSED             0       /* closed */
  135: #define TCPS_LISTEN             1       /* listening for connection */
  136: #define TCPS_SYN_SENT           2       /* active, have sent syn */
  137: #define TCPS_SYN_RECEIVED       3       /* have send and received syn */
  138: /* states < TCPS_ESTABLISHED are those where connections not established */
  139: #define TCPS_ESTABLISHED        4       /* established */
  140: #define TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */
  141: /* states > TCPS_CLOSE_WAIT are those where user has closed */
  142: #define TCPS_FIN_WAIT_1         6       /* have closed, sent fin */
  143: #define TCPS_CLOSING            7       /* closed xchd FIN; await FIN ACK */
  144: #define TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */
  145: /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
  146: #define TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */
  147: #define TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */
  148: 
  149: #define TCPS_HAVERCVDSYN(s)     ((s) >= TCPS_SYN_RECEIVED)
  150: #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
  151: #define TCPS_HAVERCVDFIN(s)     ((s) >= TCPS_TIME_WAIT)
  152: 
  153: /*
  154:  * TCP sequence numbers are 32 bit integers operated
  155:  * on with modular arithmetic.  These macros can be
  156:  * used to compare such integers.
  157:  */
  158: #define SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
  159: #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
  160: #define SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
  161: #define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
  162: 
  163: /*
  164:  * Macros to initialize tcp sequence numbers for
  165:  * send and receive from initial send and receive
  166:  * sequence numbers.
  167:  */
  168: #define tcp_rcvseqinit(tp) \
  169:      (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
  170: 
  171: #define tcp_sendseqinit(tp) \
  172:     (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss
  173: 
  174: #define TCP_ISSINCR     (125*1024)      /* increment for tcp_iss each second */
  175: 
  176: #endif

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