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 /*      $NetBSD: tcp.h,v 1.37 2021/02/03 18:13:13 roy Exp $     */
    2 
    3 /*
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)tcp.h       8.1 (Berkeley) 6/10/93
   32  */
   33 
   34 #ifndef _NETINET_TCP_H_
   35 #define _NETINET_TCP_H_
   36 
   37 #include <sys/featuretest.h>
   38 
   39 #if defined(_NETBSD_SOURCE)
   40 #include <sys/types.h>
   41 
   42 typedef uint32_t tcp_seq;
   43 /*
   44  * TCP header.
   45  * Per RFC 793, September, 1981.
   46  * Updated by RFC 3168, September, 2001.
   47  */
   48 struct tcphdr {
   49         uint16_t th_sport;              /* source port */
   50         uint16_t th_dport;              /* destination port */
   51         tcp_seq   th_seq;               /* sequence number */
   52         tcp_seq   th_ack;               /* acknowledgement number */
   53 #if BYTE_ORDER == LITTLE_ENDIAN
   54         /*LINTED non-portable bitfields*/
   55         uint8_t  th_x2:4,               /* (unused) */
   56                   th_off:4;             /* data offset */
   57 #endif
   58 #if BYTE_ORDER == BIG_ENDIAN
   59         /*LINTED non-portable bitfields*/
   60         uint8_t  th_off:4,              /* data offset */
   61                   th_x2:4;              /* (unused) */
   62 #endif
   63         uint8_t  th_flags;
   64 #define TH_FIN    0x01          /* Final: Set on the last segment */
   65 #define TH_SYN    0x02          /* Synchronization: New conn with dst port */
   66 #define TH_RST    0x04          /* Reset: Announce to peer conn terminated */
   67 #define TH_PUSH   0x08          /* Push: Immediately send, don't buffer seg */
   68 #define TH_ACK    0x10          /* Acknowledge: Part of connection establish */
   69 #define TH_URG    0x20          /* Urgent: send special marked segment now */
   70 #define TH_ECE    0x40          /* ECN Echo */
   71 #define TH_CWR    0x80          /* Congestion Window Reduced */
   72         uint16_t th_win;                        /* window */
   73         uint16_t th_sum;                        /* checksum */
   74         uint16_t th_urp;                        /* urgent pointer */
   75 };
   76 #ifdef __CTASSERT
   77 __CTASSERT(sizeof(struct tcphdr) == 20);
   78 #endif
   79 
   80 #define TCPOPT_EOL              0
   81 #define    TCPOLEN_EOL                  1
   82 #define TCPOPT_PAD              0
   83 #define    TCPOLEN_PAD                  1
   84 #define TCPOPT_NOP              1
   85 #define    TCPOLEN_NOP                  1
   86 #define TCPOPT_MAXSEG           2
   87 #define    TCPOLEN_MAXSEG               4
   88 #define TCPOPT_WINDOW           3
   89 #define    TCPOLEN_WINDOW               3
   90 #define TCPOPT_SACK_PERMITTED   4               /* Experimental */
   91 #define    TCPOLEN_SACK_PERMITTED       2
   92 #define TCPOPT_SACK             5               /* Experimental */
   93 #define TCPOPT_TIMESTAMP        8
   94 #define    TCPOLEN_TIMESTAMP            10
   95 #define    TCPOLEN_TSTAMP_APPA          (TCPOLEN_TIMESTAMP+2) /* appendix A */
   96 
   97 #define TCPOPT_TSTAMP_HDR       \
   98     (TCPOPT_NOP<<24|TCPOPT_NOP<<16|TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)
   99 
  100 #define TCPOPT_SIGNATURE        19              /* Keyed MD5: RFC 2385 */
  101 #define    TCPOLEN_SIGNATURE            18
  102 #define    TCPOLEN_SIGLEN               (TCPOLEN_SIGNATURE+2) /* padding */
  103 
  104 #define MAX_TCPOPTLEN   40      /* max # bytes that go in options */
  105 
  106 /*
  107  * Default maximum segment size for TCP.
  108  * This is defined by RFC 1112 Sec 4.2.2.6.
  109  */
  110 #define TCP_MSS         536
  111 
  112 #define TCP_MINMSS      216
  113 
  114 #define TCP_MAXWIN      65535   /* largest value for (unscaled) window */
  115 
  116 #define TCP_MAX_WINSHIFT        14      /* maximum window shift */
  117 
  118 #define TCP_MAXBURST    4       /* maximum segments in a burst */
  119 
  120 #endif /* _NETBSD_SOURCE */
  121 
  122 /*
  123  * User-settable options (used with setsockopt).
  124  */
  125 #define TCP_NODELAY     1       /* don't delay send to coalesce packets */
  126 #define TCP_MAXSEG      2       /* set maximum segment size */
  127 #define TCP_KEEPIDLE    3
  128 #ifdef notyet
  129 #define TCP_NOPUSH      4       /* reserved for FreeBSD compat */
  130 #endif
  131 #define TCP_KEEPINTVL   5
  132 #define TCP_KEEPCNT     6
  133 #define TCP_KEEPINIT    7
  134 #ifdef notyet
  135 #define TCP_NOOPT       8       /* reserved for FreeBSD compat */
  136 #endif
  137 #define TCP_INFO        9       /* retrieve tcp_info structure */
  138 #define TCP_MD5SIG      0x10    /* use MD5 digests (RFC2385) */
  139 #define TCP_CONGCTL     0x20    /* selected congestion control */
  140 
  141 #define TCPI_OPT_TIMESTAMPS     0x01
  142 #define TCPI_OPT_SACK           0x02
  143 #define TCPI_OPT_WSCALE         0x04
  144 #define TCPI_OPT_ECN            0x08
  145 #define TCPI_OPT_TOE            0x10
  146 
  147 /*
  148  * The TCP_INFO socket option comes from the Linux 2.6 TCP API, and permits
  149  * the caller to query certain information about the state of a TCP
  150  * connection.  We provide an overlapping set of fields with the Linux
  151  * implementation, but since this is a fixed size structure, room has been
  152  * left for growth.  In order to maximize potential future compatibility with
  153  * the Linux API, the same variable names and order have been adopted, and
  154  * padding left to make room for omitted fields in case they are added later.
  155  *
  156  * XXX: This is currently an unstable ABI/API, in that it is expected to
  157  * change.
  158  */
  159 struct tcp_info {
  160         uint8_t         tcpi_state; /* TCP FSM state. */
  161         uint8_t         __tcpi_ca_state;
  162         uint8_t         __tcpi_retransmits;
  163         uint8_t         __tcpi_probes;
  164         uint8_t         __tcpi_backoff;
  165         uint8_t         tcpi_options;          /* Options enabled on conn. */
  166         /*LINTED: non-portable bitfield*/
  167         uint8_t         tcpi_snd_wscale:4,      /* RFC1323 send shift value. */
  168         /*LINTED: non-portable bitfield*/
  169                         tcpi_rcv_wscale:4; /* RFC1323 recv shift value. */
  170 
  171         uint32_t        tcpi_rto;               /* Retransmission timeout (usec). */
  172         uint32_t        __tcpi_ato;
  173         uint32_t        tcpi_snd_mss;           /* Max segment size for send. */
  174         uint32_t        tcpi_rcv_mss;           /* Max segment size for receive. */
  175 
  176         uint32_t        __tcpi_unacked;
  177         uint32_t        __tcpi_sacked;
  178         uint32_t        __tcpi_lost;
  179         uint32_t        __tcpi_retrans;
  180         uint32_t        __tcpi_fackets;
  181 
  182         /* Times; measurements in usecs. */
  183         uint32_t        __tcpi_last_data_sent;
  184         uint32_t        __tcpi_last_ack_sent;   /* Also unimpl. on Linux? */
  185         uint32_t        tcpi_last_data_recv;    /* Time since last recv data. */
  186         uint32_t        __tcpi_last_ack_recv;
  187 
  188         /* Metrics; variable units. */
  189         uint32_t        __tcpi_pmtu;
  190         uint32_t        __tcpi_rcv_ssthresh;
  191         uint32_t        tcpi_rtt;               /* Smoothed RTT in usecs. */
  192         uint32_t        tcpi_rttvar;            /* RTT variance in usecs. */
  193         uint32_t        tcpi_snd_ssthresh;      /* Slow start threshold. */
  194         uint32_t        tcpi_snd_cwnd;          /* Send congestion window. */
  195         uint32_t        __tcpi_advmss;
  196         uint32_t        __tcpi_reordering;
  197 
  198         uint32_t        __tcpi_rcv_rtt;
  199         uint32_t        tcpi_rcv_space;         /* Advertised recv window. */
  200 
  201         /* FreeBSD/NetBSD extensions to tcp_info. */
  202         uint32_t        tcpi_snd_wnd;           /* Advertised send window. */
  203         uint32_t        tcpi_snd_bwnd;          /* No longer used. */
  204         uint32_t        tcpi_snd_nxt;           /* Next egress seqno */
  205         uint32_t        tcpi_rcv_nxt;           /* Next ingress seqno */
  206         uint32_t        tcpi_toe_tid;           /* HWTID for TOE endpoints */
  207         uint32_t        tcpi_snd_rexmitpack;    /* Retransmitted packets */
  208         uint32_t        tcpi_rcv_ooopack;       /* Out-of-order packets */
  209         uint32_t        tcpi_snd_zerowin;       /* Zero-sized windows sent */
  210         
  211         /* Padding to grow without breaking ABI. */
  212         uint32_t        __tcpi_pad[26];         /* Padding. */
  213 };
  214 
  215 #endif /* !_NETINET_TCP_H_ */

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