Annotation of qemu/slirp/tcp.h, revision 1.1.1.8

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.
1.1.1.5   root       13:  * 3. Neither the name of the University nor the names of its contributors
1.1       root       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: 
1.1.1.8 ! root       36: typedef        uint32_t tcp_seq;
1.1       root       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 {
1.1.1.8 ! root       49:        uint16_t th_sport;              /* source port */
        !            50:        uint16_t th_dport;              /* destination port */
1.1       root       51:        tcp_seq th_seq;                 /* sequence number */
                     52:        tcp_seq th_ack;                 /* acknowledgement number */
1.1.1.7   root       53: #ifdef HOST_WORDS_BIGENDIAN
1.1       root       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
1.1.1.8 ! root       60:        uint8_t th_flags;
1.1       root       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
1.1.1.8 ! root       67:        uint16_t th_win;                /* window */
        !            68:        uint16_t th_sum;                /* checksum */
        !            69:        uint16_t th_urp;                /* urgent pointer */
1.1       root       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)).
1.1.1.2   root       95:  *
                     96:  * We make this 1460 because we only care about Ethernet in the qemu context.
1.1       root       97:  */
1.1.1.2   root       98: #define        TCP_MSS 1460
1.1       root       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).
1.1.1.3   root      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.
1.1       root      110:  */
1.1.1.3   root      111: #undef TCP_NODELAY
                    112: #define        TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
                    113: #undef TCP_MAXSEG
1.1       root      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

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