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Annotation of qemu/slirp/tcp.h, revision 1.1

1.1     ! root        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: typedef        u_int32_t       tcp_seq;
        !            41: 
        !            42: #define      PR_SLOWHZ       2               /* 2 slow timeouts per second (approx) */
        !            43: #define      PR_FASTHZ       5               /* 5 fast timeouts per second (not important) */
        !            44: 
        !            45: extern int tcp_rcvspace;
        !            46: extern int tcp_sndspace;
        !            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:        u_int16_t       th_sport;               /* source port */
        !            58:        u_int16_t       th_dport;               /* destination port */
        !            59:        tcp_seq th_seq;                 /* sequence number */
        !            60:        tcp_seq th_ack;                 /* acknowledgement number */
        !            61: #ifdef 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: #define        TCP_MSS 512
        !           105: 
        !           106: #define        TCP_MAXWIN      65535   /* largest value for (unscaled) window */
        !           107: 
        !           108: #define TCP_MAX_WINSHIFT       14      /* maximum window shift */
        !           109: 
        !           110: /*
        !           111:  * User-settable options (used with setsockopt).
        !           112:  */
        !           113: /* #define     TCP_NODELAY     0x01 */ /* don't delay send to coalesce packets */
        !           114: /* #define     TCP_MAXSEG      0x02 */ /* set maximum segment size */
        !           115: 
        !           116: /*
        !           117:  * TCP FSM state definitions.
        !           118:  * Per RFC793, September, 1981.
        !           119:  */
        !           120: 
        !           121: #define TCP_NSTATES     11
        !           122: 
        !           123: #define TCPS_CLOSED             0       /* closed */
        !           124: #define TCPS_LISTEN             1       /* listening for connection */
        !           125: #define TCPS_SYN_SENT           2       /* active, have sent syn */
        !           126: #define TCPS_SYN_RECEIVED       3       /* have send and received syn */
        !           127: /* states < TCPS_ESTABLISHED are those where connections not established */
        !           128: #define TCPS_ESTABLISHED        4       /* established */
        !           129: #define TCPS_CLOSE_WAIT         5       /* rcvd fin, waiting for close */
        !           130: /* states > TCPS_CLOSE_WAIT are those where user has closed */
        !           131: #define TCPS_FIN_WAIT_1         6       /* have closed, sent fin */
        !           132: #define TCPS_CLOSING            7       /* closed xchd FIN; await FIN ACK */
        !           133: #define TCPS_LAST_ACK           8       /* had fin and close; await FIN ACK */
        !           134: /* states > TCPS_CLOSE_WAIT && < TCPS_FIN_WAIT_2 await ACK of FIN */
        !           135: #define TCPS_FIN_WAIT_2         9       /* have closed, fin is acked */
        !           136: #define TCPS_TIME_WAIT          10      /* in 2*msl quiet wait after close */
        !           137: 
        !           138: #define TCPS_HAVERCVDSYN(s)     ((s) >= TCPS_SYN_RECEIVED)
        !           139: #define TCPS_HAVEESTABLISHED(s) ((s) >= TCPS_ESTABLISHED)
        !           140: #define TCPS_HAVERCVDFIN(s)     ((s) >= TCPS_TIME_WAIT)
        !           141: 
        !           142: /*
        !           143:  * TCP sequence numbers are 32 bit integers operated
        !           144:  * on with modular arithmetic.  These macros can be
        !           145:  * used to compare such integers.
        !           146:  */
        !           147: #define SEQ_LT(a,b)     ((int)((a)-(b)) < 0)
        !           148: #define SEQ_LEQ(a,b)    ((int)((a)-(b)) <= 0)
        !           149: #define SEQ_GT(a,b)     ((int)((a)-(b)) > 0)
        !           150: #define SEQ_GEQ(a,b)    ((int)((a)-(b)) >= 0)
        !           151: 
        !           152: /*
        !           153:  * Macros to initialize tcp sequence numbers for
        !           154:  * send and receive from initial send and receive
        !           155:  * sequence numbers.
        !           156:  */
        !           157: #define tcp_rcvseqinit(tp) \
        !           158:      (tp)->rcv_adv = (tp)->rcv_nxt = (tp)->irs + 1
        !           159: 
        !           160: #define tcp_sendseqinit(tp) \
        !           161:     (tp)->snd_una = (tp)->snd_nxt = (tp)->snd_max = (tp)->snd_up = (tp)->iss
        !           162: 
        !           163: #define TCP_ISSINCR     (125*1024)      /* increment for tcp_iss each second */
        !           164: 
        !           165: extern tcp_seq tcp_iss;                /* tcp initial send seq # */
        !           166: 
        !           167: extern char *tcpstates[];
        !           168: 
        !           169: #endif

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