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[/] [or1k/] [trunk/] [rtems-20020807/] [cpukit/] [libnetworking/] [netinet/] [tcp.h] - Blame information for rev 1774

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1 1026 ivang
/*
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 * Copyright (c) 1982, 1986, 1993
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 *      The Regents of the University of California.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. All advertising materials mentioning features or use of this software
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 *    must display the following acknowledgement:
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 *      This product includes software developed by the University of
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 *      California, Berkeley and its contributors.
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 * 4. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 *
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 *      @(#)tcp.h       8.1 (Berkeley) 6/10/93
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 * tcp.h,v 1.2 2002/07/17 17:08:48 joel Exp
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 */
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#ifndef _NETINET_TCP_H_
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#define _NETINET_TCP_H_
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typedef u_long  tcp_seq;
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typedef u_long  tcp_cc;                 /* connection count per rfc1644 */
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/*
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 * TCP header.
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 * Per RFC 793, September, 1981.
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 */
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struct tcphdr {
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        u_short th_sport BYTE_PACK;     /* source port */
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        u_short th_dport BYTE_PACK;     /* destination port */
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        tcp_seq th_seq BYTE_PACK;       /* sequence number */
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        tcp_seq th_ack BYTE_PACK;       /* acknowledgement number */
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#if BYTE_ORDER == LITTLE_ENDIAN
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        u_char  th_x2:4,                /* (unused) */
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                th_off:4;               /* data offset */
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#endif
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#if BYTE_ORDER == BIG_ENDIAN
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        u_char  th_off:4,               /* data offset */
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                th_x2:4;                /* (unused) */
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#endif
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        u_char  th_flags;
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#define TH_FIN  0x01
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#define TH_SYN  0x02
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#define TH_RST  0x04
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#define TH_PUSH 0x08
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#define TH_ACK  0x10
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#define TH_URG  0x20
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#define TH_FLAGS (TH_FIN|TH_SYN|TH_RST|TH_ACK|TH_URG)
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        u_short th_win BYTE_PACK;       /* window */
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        u_short th_sum BYTE_PACK;       /* checksum */
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        u_short th_urp BYTE_PACK;       /* urgent pointer */
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};
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#define TCPOPT_EOL              0
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#define TCPOPT_NOP              1
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#define TCPOPT_MAXSEG           2
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#define    TCPOLEN_MAXSEG               4
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#define TCPOPT_WINDOW           3
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#define    TCPOLEN_WINDOW               3
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#define TCPOPT_SACK_PERMITTED   4               /* Experimental */
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#define    TCPOLEN_SACK_PERMITTED       2
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#define TCPOPT_SACK             5               /* Experimental */
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#define TCPOPT_TIMESTAMP        8
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#define    TCPOLEN_TIMESTAMP            10
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#define    TCPOLEN_TSTAMP_APPA          (TCPOLEN_TIMESTAMP+2) /* appendix A */
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#define    TCPOPT_TSTAMP_HDR            \
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    (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
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#define TCPOPT_CC               11              /* CC options: RFC-1644 */
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#define TCPOPT_CCNEW            12
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#define TCPOPT_CCECHO           13
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#define    TCPOLEN_CC                   6
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#define    TCPOLEN_CC_APPA              (TCPOLEN_CC+2)
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#define    TCPOPT_CC_HDR(ccopt)         \
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    (TCPOPT_NOP<<24|TCPOPT_NOP<<16|(ccopt)<<8|TCPOLEN_CC)
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/*
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 * Default maximum segment size for TCP.
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 * With an IP MSS of 576, this is 536,
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 * but 512 is probably more convenient.
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 * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
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 */
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#define TCP_MSS 512
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#define TCP_MAXWIN      65535   /* largest value for (unscaled) window */
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#define TTCP_CLIENT_SND_WND     4096    /* dflt send window for T/TCP client */
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#define TCP_MAX_WINSHIFT        14      /* maximum window shift */
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#define TCP_MAXHLEN     (0xf<<2)        /* max length of header in bytes */
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#define TCP_MAXOLEN     (TCP_MAXHLEN - sizeof(struct tcphdr))
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                                        /* max space left for options */
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/*
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 * User-settable options (used with setsockopt).
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 */
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#define TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
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#define TCP_MAXSEG      0x02    /* set maximum segment size */
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#define TCP_NOPUSH      0x04    /* don't push last block of write */
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#define TCP_NOOPT       0x08    /* don't use TCP options */
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#endif

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