The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp.h

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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  * 4. 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  * $FreeBSD: releng/8.1/sys/netinet/tcp.h 201593 2010-01-05 17:04:14Z jhb $
   31  */
   32 
   33 #ifndef _NETINET_TCP_H_
   34 #define _NETINET_TCP_H_
   35 
   36 #include <sys/cdefs.h>
   37 
   38 #if __BSD_VISIBLE
   39 
   40 typedef u_int32_t tcp_seq;
   41 
   42 #define tcp6_seq        tcp_seq /* for KAME src sync over BSD*'s */
   43 #define tcp6hdr         tcphdr  /* for KAME src sync over BSD*'s */
   44 
   45 /*
   46  * TCP header.
   47  * Per RFC 793, September, 1981.
   48  */
   49 struct tcphdr {
   50         u_short th_sport;               /* source port */
   51         u_short th_dport;               /* destination port */
   52         tcp_seq th_seq;                 /* sequence number */
   53         tcp_seq th_ack;                 /* acknowledgement number */
   54 #if BYTE_ORDER == LITTLE_ENDIAN
   55         u_int   th_x2:4,                /* (unused) */
   56                 th_off:4;               /* data offset */
   57 #endif
   58 #if BYTE_ORDER == BIG_ENDIAN
   59         u_int   th_off:4,               /* data offset */
   60                 th_x2:4;                /* (unused) */
   61 #endif
   62         u_char  th_flags;
   63 #define TH_FIN  0x01
   64 #define TH_SYN  0x02
   65 #define TH_RST  0x04
   66 #define TH_PUSH 0x08
   67 #define TH_ACK  0x10
   68 #define TH_URG  0x20
   69 #define TH_ECE  0x40
   70 #define TH_CWR  0x80
   71 #define TH_FLAGS        (TH_FIN|TH_SYN|TH_RST|TH_PUSH|TH_ACK|TH_URG|TH_ECE|TH_CWR)
   72 #define PRINT_TH_FLAGS  "\2\1FIN\2SYN\3RST\4PUSH\5ACK\6URG\7ECE\10CWR"
   73 
   74         u_short th_win;                 /* window */
   75         u_short th_sum;                 /* checksum */
   76         u_short th_urp;                 /* urgent pointer */
   77 };
   78 
   79 #define TCPOPT_EOL              0
   80 #define    TCPOLEN_EOL                  1
   81 #define TCPOPT_PAD              0               /* padding after EOL */
   82 #define    TCPOLEN_PAD                  1
   83 #define TCPOPT_NOP              1
   84 #define    TCPOLEN_NOP                  1
   85 #define TCPOPT_MAXSEG           2
   86 #define    TCPOLEN_MAXSEG               4
   87 #define TCPOPT_WINDOW           3
   88 #define    TCPOLEN_WINDOW               3
   89 #define TCPOPT_SACK_PERMITTED   4
   90 #define    TCPOLEN_SACK_PERMITTED       2
   91 #define TCPOPT_SACK             5
   92 #define    TCPOLEN_SACKHDR              2
   93 #define    TCPOLEN_SACK                 8       /* 2*sizeof(tcp_seq) */
   94 #define TCPOPT_TIMESTAMP        8
   95 #define    TCPOLEN_TIMESTAMP            10
   96 #define    TCPOLEN_TSTAMP_APPA          (TCPOLEN_TIMESTAMP+2) /* appendix A */
   97 #define TCPOPT_SIGNATURE        19              /* Keyed MD5: RFC 2385 */
   98 #define    TCPOLEN_SIGNATURE            18
   99 
  100 /* Miscellaneous constants */
  101 #define MAX_SACK_BLKS   6       /* Max # SACK blocks stored at receiver side */
  102 #define TCP_MAX_SACK    4       /* MAX # SACKs sent in any segment */
  103 
  104 
  105 /*
  106  * Default maximum segment size for TCP.
  107  * With an IP MTU of 576, this is 536,
  108  * but 512 is probably more convenient.
  109  * This should be defined as MIN(512, IP_MSS - sizeof (struct tcpiphdr)).
  110  */
  111 #define TCP_MSS 512
  112 /*
  113  * TCP_MINMSS is defined to be 216 which is fine for the smallest
  114  * link MTU (256 bytes, AX.25 packet radio) in the Internet.
  115  * However it is very unlikely to come across such low MTU interfaces
  116  * these days (anno dato 2003).
  117  * See tcp_subr.c tcp_minmss SYSCTL declaration for more comments.
  118  * Setting this to "" disables the minmss check.
  119  */
  120 #define TCP_MINMSS 216
  121 
  122 /*
  123  * Default maximum segment size for TCP6.
  124  * With an IP6 MSS of 1280, this is 1220,
  125  * but 1024 is probably more convenient. (xxx kazu in doubt)
  126  * This should be defined as MIN(1024, IP6_MSS - sizeof (struct tcpip6hdr))
  127  */
  128 #define TCP6_MSS        1024
  129 
  130 #define TCP_MAXWIN      65535   /* largest value for (unscaled) window */
  131 #define TTCP_CLIENT_SND_WND     4096    /* dflt send window for T/TCP client */
  132 
  133 #define TCP_MAX_WINSHIFT        14      /* maximum window shift */
  134 
  135 #define TCP_MAXBURST            4       /* maximum segments in a burst */
  136 
  137 #define TCP_MAXHLEN     (0xf<<2)        /* max length of header in bytes */
  138 #define TCP_MAXOLEN     (TCP_MAXHLEN - sizeof(struct tcphdr))
  139                                         /* max space left for options */
  140 #endif /* __BSD_VISIBLE */
  141 
  142 /*
  143  * User-settable options (used with setsockopt).
  144  */
  145 #define TCP_NODELAY     0x01    /* don't delay send to coalesce packets */
  146 #if __BSD_VISIBLE
  147 #define TCP_MAXSEG      0x02    /* set maximum segment size */
  148 #define TCP_NOPUSH      0x04    /* don't push last block of write */
  149 #define TCP_NOOPT       0x08    /* don't use TCP options */
  150 #define TCP_MD5SIG      0x10    /* use MD5 digests (RFC2385) */
  151 #define TCP_INFO        0x20    /* retrieve tcp_info structure */
  152 #define TCP_CONGESTION  0x40    /* get/set congestion control algorithm */
  153 
  154 #define TCP_CA_NAME_MAX 16      /* max congestion control name length */
  155 
  156 #define TCPI_OPT_TIMESTAMPS     0x01
  157 #define TCPI_OPT_SACK           0x02
  158 #define TCPI_OPT_WSCALE         0x04
  159 #define TCPI_OPT_ECN            0x08
  160 #define TCPI_OPT_TOE            0x10
  161 
  162 /*
  163  * The TCP_INFO socket option comes from the Linux 2.6 TCP API, and permits
  164  * the caller to query certain information about the state of a TCP
  165  * connection.  We provide an overlapping set of fields with the Linux
  166  * implementation, but since this is a fixed size structure, room has been
  167  * left for growth.  In order to maximize potential future compatibility with
  168  * the Linux API, the same variable names and order have been adopted, and
  169  * padding left to make room for omitted fields in case they are added later.
  170  *
  171  * XXX: This is currently an unstable ABI/API, in that it is expected to
  172  * change.
  173  */
  174 struct tcp_info {
  175         u_int8_t        tcpi_state;             /* TCP FSM state. */
  176         u_int8_t        __tcpi_ca_state;
  177         u_int8_t        __tcpi_retransmits;
  178         u_int8_t        __tcpi_probes;
  179         u_int8_t        __tcpi_backoff;
  180         u_int8_t        tcpi_options;           /* Options enabled on conn. */
  181         u_int8_t        tcpi_snd_wscale:4,      /* RFC1323 send shift value. */
  182                         tcpi_rcv_wscale:4;      /* RFC1323 recv shift value. */
  183 
  184         u_int32_t       tcpi_rto;               /* Retransmission timeout (usec). */
  185         u_int32_t       __tcpi_ato;
  186         u_int32_t       tcpi_snd_mss;           /* Max segment size for send. */
  187         u_int32_t       tcpi_rcv_mss;           /* Max segment size for receive. */
  188 
  189         u_int32_t       __tcpi_unacked;
  190         u_int32_t       __tcpi_sacked;
  191         u_int32_t       __tcpi_lost;
  192         u_int32_t       __tcpi_retrans;
  193         u_int32_t       __tcpi_fackets;
  194 
  195         /* Times; measurements in usecs. */
  196         u_int32_t       __tcpi_last_data_sent;
  197         u_int32_t       __tcpi_last_ack_sent;   /* Also unimpl. on Linux? */
  198         u_int32_t       tcpi_last_data_recv;    /* Time since last recv data. */
  199         u_int32_t       __tcpi_last_ack_recv;
  200 
  201         /* Metrics; variable units. */
  202         u_int32_t       __tcpi_pmtu;
  203         u_int32_t       __tcpi_rcv_ssthresh;
  204         u_int32_t       tcpi_rtt;               /* Smoothed RTT in usecs. */
  205         u_int32_t       tcpi_rttvar;            /* RTT variance in usecs. */
  206         u_int32_t       tcpi_snd_ssthresh;      /* Slow start threshold. */
  207         u_int32_t       tcpi_snd_cwnd;          /* Send congestion window. */
  208         u_int32_t       __tcpi_advmss;
  209         u_int32_t       __tcpi_reordering;
  210 
  211         u_int32_t       __tcpi_rcv_rtt;
  212         u_int32_t       tcpi_rcv_space;         /* Advertised recv window. */
  213 
  214         /* FreeBSD extensions to tcp_info. */
  215         u_int32_t       tcpi_snd_wnd;           /* Advertised send window. */
  216         u_int32_t       tcpi_snd_bwnd;          /* Bandwidth send window. */
  217         u_int32_t       tcpi_snd_nxt;           /* Next egress seqno */
  218         u_int32_t       tcpi_rcv_nxt;           /* Next ingress seqno */
  219         u_int32_t       tcpi_toe_tid;           /* HWTID for TOE endpoints */
  220         
  221         /* Padding to grow without breaking ABI. */
  222         u_int32_t       __tcpi_pad[29];         /* Padding. */
  223 };
  224 #endif
  225 
  226 #endif /* !_NETINET_TCP_H_ */

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