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//==========================================================================
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//
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// include/netinet/tcp_var.h
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//
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//==========================================================================
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//####BSDCOPYRIGHTBEGIN####
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//
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// -------------------------------------------
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//
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// Portions of this software may have been derived from OpenBSD,
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// FreeBSD or other sources, and are covered by the appropriate
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// copyright disclaimers included herein.
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//
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// Portions created by Red Hat are
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// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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//
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// -------------------------------------------
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//
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//####BSDCOPYRIGHTEND####
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//==========================================================================
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/*
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* Copyright (c) 1982, 1986, 1993, 1994, 1995
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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_var.h 8.4 (Berkeley) 5/24/95
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* $FreeBSD: src/sys/netinet/tcp_var.h,v 1.56.2.8 2001/08/22 00:59:13 silby Exp $
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*/
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#ifndef _NETINET_TCP_VAR_H_
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#define _NETINET_TCP_VAR_H_
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/*
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* Kernel variables for tcp.
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*/
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/* TCP segment queue entry */
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struct tseg_qent {
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LIST_ENTRY(tseg_qent) tqe_q;
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int tqe_len; /* TCP segment data length */
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struct tcphdr *tqe_th; /* a pointer to tcp header */
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struct mbuf *tqe_m; /* mbuf contains packet */
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};
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LIST_HEAD(tsegqe_head, tseg_qent);
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#ifdef MALLOC_DECLARE
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MALLOC_DECLARE(M_TSEGQ);
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#endif
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struct tcptemp {
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u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
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struct tcphdr tt_t;
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};
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#define tcp6cb tcpcb /* for KAME src sync over BSD*'s */
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/*
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* Tcp control block, one per tcp; fields:
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* Organized for 16 byte cacheline efficiency.
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*/
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struct tcpcb {
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struct tsegqe_head t_segq;
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int t_dupacks; /* consecutive dup acks recd */
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struct tcptemp *unused; /* unused */
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struct callout *tt_rexmt; /* retransmit timer */
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struct callout *tt_persist; /* retransmit persistence */
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struct callout *tt_keep; /* keepalive */
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struct callout *tt_2msl; /* 2*msl TIME_WAIT timer */
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struct callout *tt_delack; /* delayed ACK timer */
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struct inpcb *t_inpcb; /* back pointer to internet pcb */
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int t_state; /* state of this connection */
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u_int t_flags;
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#define TF_ACKNOW 0x00001 /* ack peer immediately */
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#define TF_DELACK 0x00002 /* ack, but try to delay it */
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#define TF_NODELAY 0x00004 /* don't delay packets to coalesce */
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#define TF_NOOPT 0x00008 /* don't use tcp options */
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#define TF_SENTFIN 0x00010 /* have sent FIN */
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#define TF_REQ_SCALE 0x00020 /* have/will request window scaling */
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#define TF_RCVD_SCALE 0x00040 /* other side has requested scaling */
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#define TF_REQ_TSTMP 0x00080 /* have/will request timestamps */
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#define TF_RCVD_TSTMP 0x00100 /* a timestamp was received in SYN */
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#define TF_SACK_PERMIT 0x00200 /* other side said I could SACK */
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#define TF_NEEDSYN 0x00400 /* send SYN (implicit state) */
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#define TF_NEEDFIN 0x00800 /* send FIN (implicit state) */
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#define TF_NOPUSH 0x01000 /* don't push */
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#define TF_REQ_CC 0x02000 /* have/will request CC */
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#define TF_RCVD_CC 0x04000 /* a CC was received in SYN */
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#define TF_SENDCCNEW 0x08000 /* send CCnew instead of CC in SYN */
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#define TF_MORETOCOME 0x10000 /* More data to be appended to sock */
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#define TF_LQ_OVERFLOW 0x20000 /* listen queue overflow */
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int t_force; /* 1 if forcing out a byte */
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tcp_seq snd_una; /* send unacknowledged */
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tcp_seq snd_max; /* highest sequence number sent;
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* used to recognize retransmits
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*/
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tcp_seq snd_nxt; /* send next */
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tcp_seq snd_up; /* send urgent pointer */
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tcp_seq snd_wl1; /* window update seg seq number */
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tcp_seq snd_wl2; /* window update seg ack number */
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tcp_seq iss; /* initial send sequence number */
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tcp_seq irs; /* initial receive sequence number */
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tcp_seq rcv_nxt; /* receive next */
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tcp_seq rcv_adv; /* advertised window */
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u_long rcv_wnd; /* receive window */
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tcp_seq rcv_up; /* receive urgent pointer */
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u_long snd_wnd; /* send window */
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u_long snd_cwnd; /* congestion-controlled window */
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u_long snd_ssthresh; /* snd_cwnd size threshold for
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* for slow start exponential to
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* linear switch
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*/
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tcp_seq snd_recover; /* for use in fast recovery */
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u_int t_maxopd; /* mss plus options */
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u_long t_rcvtime; /* inactivity time */
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u_long t_starttime; /* time connection was established */
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int t_rtttime; /* round trip time */
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tcp_seq t_rtseq; /* sequence number being timed */
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int t_rxtcur; /* current retransmit value (ticks) */
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u_int t_maxseg; /* maximum segment size */
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int t_srtt; /* smoothed round-trip time */
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int t_rttvar; /* variance in round-trip time */
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int t_rxtshift; /* log(2) of rexmt exp. backoff */
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u_int t_rttmin; /* minimum rtt allowed */
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u_long t_rttupdated; /* number of times rtt sampled */
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u_long max_sndwnd; /* largest window peer has offered */
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int t_softerror; /* possible error not yet reported */
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/* out-of-band data */
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char t_oobflags; /* have some */
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char t_iobc; /* input character */
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#define TCPOOB_HAVEDATA 0x01
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#define TCPOOB_HADDATA 0x02
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/* RFC 1323 variables */
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u_char snd_scale; /* window scaling for send window */
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u_char rcv_scale; /* window scaling for recv window */
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u_char request_r_scale; /* pending window scaling */
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u_char requested_s_scale;
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u_long ts_recent; /* timestamp echo data */
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u_long ts_recent_age; /* when last updated */
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tcp_seq last_ack_sent;
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/* RFC 1644 variables */
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tcp_cc cc_send; /* send connection count */
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tcp_cc cc_recv; /* receive connection count */
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/* experimental */
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u_long snd_cwnd_prev; /* cwnd prior to retransmit */
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u_long snd_ssthresh_prev; /* ssthresh prior to retransmit */
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u_long t_badrxtwin; /* window for retransmit recovery */
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};
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/*
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* Structure to hold TCP options that are only used during segment
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* processing (in tcp_input), but not held in the tcpcb.
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* It's basically used to reduce the number of parameters
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* to tcp_dooptions.
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*/
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struct tcpopt {
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u_long to_flag; /* which options are present */
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#define TOF_TS 0x0001 /* timestamp */
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#define TOF_CC 0x0002 /* CC and CCnew are exclusive */
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#define TOF_CCNEW 0x0004
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#define TOF_CCECHO 0x0008
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u_long to_tsval;
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u_long to_tsecr;
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tcp_cc to_cc; /* holds CC or CCnew */
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tcp_cc to_ccecho;
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};
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/*
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* The TAO cache entry which is stored in the protocol family specific
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* portion of the route metrics.
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*/
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struct rmxp_tao {
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tcp_cc tao_cc; /* latest CC in valid SYN */
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tcp_cc tao_ccsent; /* latest CC sent to peer */
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u_short tao_mssopt; /* peer's cached MSS */
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#ifdef notyet
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u_short tao_flags; /* cache status flags */
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#define TAOF_DONT 0x0001 /* peer doesn't understand rfc1644 */
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#define TAOF_OK 0x0002 /* peer does understand rfc1644 */
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#define TAOF_UNDEF 0 /* we don't know yet */
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#endif /* notyet */
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};
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#define rmx_taop(r) ((struct rmxp_tao *)(r).rmx_filler)
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#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
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#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
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/*
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* The smoothed round-trip time and estimated variance
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* are stored as fixed point numbers scaled by the values below.
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* For convenience, these scales are also used in smoothing the average
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* (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
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* With these scales, srtt has 3 bits to the right of the binary point,
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* and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
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* binary point, and is smoothed with an ALPHA of 0.75.
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*/
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#define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
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#define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
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#define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
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#define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
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#define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
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/*
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* The initial retransmission should happen at rtt + 4 * rttvar.
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* Because of the way we do the smoothing, srtt and rttvar
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* will each average +1/2 tick of bias. When we compute
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* the retransmit timer, we want 1/2 tick of rounding and
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* 1 extra tick because of +-1/2 tick uncertainty in the
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* firing of the timer. The bias will give us exactly the
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* 1.5 tick we need. But, because the bias is
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* statistical, we have to test that we don't drop below
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* the minimum feasible timer (which is 2 ticks).
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| 250 |
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* This version of the macro adapted from a paper by Lawrence
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* Brakmo and Larry Peterson which outlines a problem caused
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* by insufficient precision in the original implementation,
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* which results in inappropriately large RTO values for very
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* fast networks.
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*/
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#define TCP_REXMTVAL(tp) \
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max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
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+ (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
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| 259 |
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| 260 |
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/*
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| 261 |
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* TCP statistics.
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| 262 |
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* Many of these should be kept per connection,
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* but that's inconvenient at the moment.
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*/
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| 265 |
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struct tcpstat {
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u_long tcps_connattempt; /* connections initiated */
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u_long tcps_accepts; /* connections accepted */
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| 268 |
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u_long tcps_connects; /* connections established */
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u_long tcps_drops; /* connections dropped */
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u_long tcps_conndrops; /* embryonic connections dropped */
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u_long tcps_closed; /* conn. closed (includes drops) */
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| 272 |
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u_long tcps_segstimed; /* segs where we tried to get rtt */
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| 273 |
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u_long tcps_rttupdated; /* times we succeeded */
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| 274 |
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u_long tcps_delack; /* delayed acks sent */
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| 275 |
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u_long tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
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| 276 |
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u_long tcps_rexmttimeo; /* retransmit timeouts */
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| 277 |
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u_long tcps_persisttimeo; /* persist timeouts */
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| 278 |
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u_long tcps_keeptimeo; /* keepalive timeouts */
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| 279 |
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u_long tcps_keepprobe; /* keepalive probes sent */
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| 280 |
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u_long tcps_keepdrops; /* connections dropped in keepalive */
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| 281 |
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| 282 |
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u_long tcps_sndtotal; /* total packets sent */
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u_long tcps_sndpack; /* data packets sent */
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u_long tcps_sndbyte; /* data bytes sent */
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u_long tcps_sndrexmitpack; /* data packets retransmitted */
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| 286 |
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u_long tcps_sndrexmitbyte; /* data bytes retransmitted */
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| 287 |
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u_long tcps_sndacks; /* ack-only packets sent */
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| 288 |
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u_long tcps_sndprobe; /* window probes sent */
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| 289 |
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u_long tcps_sndurg; /* packets sent with URG only */
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u_long tcps_sndwinup; /* window update-only packets sent */
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| 291 |
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u_long tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
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| 292 |
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| 293 |
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u_long tcps_rcvtotal; /* total packets received */
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| 294 |
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u_long tcps_rcvpack; /* packets received in sequence */
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| 295 |
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u_long tcps_rcvbyte; /* bytes received in sequence */
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| 296 |
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u_long tcps_rcvbadsum; /* packets received with ccksum errs */
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| 297 |
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u_long tcps_rcvbadoff; /* packets received with bad offset */
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| 298 |
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u_long tcps_rcvmemdrop; /* packets dropped for lack of memory */
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| 299 |
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u_long tcps_rcvshort; /* packets received too short */
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| 300 |
|
|
u_long tcps_rcvduppack; /* duplicate-only packets received */
|
| 301 |
|
|
u_long tcps_rcvdupbyte; /* duplicate-only bytes received */
|
| 302 |
|
|
u_long tcps_rcvpartduppack; /* packets with some duplicate data */
|
| 303 |
|
|
u_long tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
|
| 304 |
|
|
u_long tcps_rcvoopack; /* out-of-order packets received */
|
| 305 |
|
|
u_long tcps_rcvoobyte; /* out-of-order bytes received */
|
| 306 |
|
|
u_long tcps_rcvpackafterwin; /* packets with data after window */
|
| 307 |
|
|
u_long tcps_rcvbyteafterwin; /* bytes rcvd after window */
|
| 308 |
|
|
u_long tcps_rcvafterclose; /* packets rcvd after "close" */
|
| 309 |
|
|
u_long tcps_rcvwinprobe; /* rcvd window probe packets */
|
| 310 |
|
|
u_long tcps_rcvdupack; /* rcvd duplicate acks */
|
| 311 |
|
|
u_long tcps_rcvacktoomuch; /* rcvd acks for unsent data */
|
| 312 |
|
|
u_long tcps_rcvackpack; /* rcvd ack packets */
|
| 313 |
|
|
u_long tcps_rcvackbyte; /* bytes acked by rcvd acks */
|
| 314 |
|
|
u_long tcps_rcvwinupd; /* rcvd window update packets */
|
| 315 |
|
|
u_long tcps_pawsdrop; /* segments dropped due to PAWS */
|
| 316 |
|
|
u_long tcps_predack; /* times hdr predict ok for acks */
|
| 317 |
|
|
u_long tcps_preddat; /* times hdr predict ok for data pkts */
|
| 318 |
|
|
u_long tcps_pcbcachemiss;
|
| 319 |
|
|
u_long tcps_cachedrtt; /* times cached RTT in route updated */
|
| 320 |
|
|
u_long tcps_cachedrttvar; /* times cached rttvar updated */
|
| 321 |
|
|
u_long tcps_cachedssthresh; /* times cached ssthresh updated */
|
| 322 |
|
|
u_long tcps_usedrtt; /* times RTT initialized from route */
|
| 323 |
|
|
u_long tcps_usedrttvar; /* times RTTVAR initialized from rt */
|
| 324 |
|
|
u_long tcps_usedssthresh; /* times ssthresh initialized from rt*/
|
| 325 |
|
|
u_long tcps_persistdrop; /* timeout in persist state */
|
| 326 |
|
|
u_long tcps_badsyn; /* bogus SYN, e.g. premature ACK */
|
| 327 |
|
|
u_long tcps_mturesent; /* resends due to MTU discovery */
|
| 328 |
|
|
u_long tcps_listendrop; /* listen queue overflows */
|
| 329 |
|
|
};
|
| 330 |
|
|
|
| 331 |
|
|
/*
|
| 332 |
|
|
* TCB structure exported to user-land via sysctl(3).
|
| 333 |
|
|
* Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
|
| 334 |
|
|
* included. Not all of our clients do.
|
| 335 |
|
|
*/
|
| 336 |
|
|
#if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
|
| 337 |
|
|
struct xtcpcb {
|
| 338 |
|
|
size_t xt_len;
|
| 339 |
|
|
struct inpcb xt_inp;
|
| 340 |
|
|
struct tcpcb xt_tp;
|
| 341 |
|
|
struct xsocket xt_socket;
|
| 342 |
|
|
u_quad_t xt_alignment_hack;
|
| 343 |
|
|
};
|
| 344 |
|
|
#endif
|
| 345 |
|
|
|
| 346 |
|
|
/*
|
| 347 |
|
|
* Names for TCP sysctl objects
|
| 348 |
|
|
*/
|
| 349 |
|
|
#define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
|
| 350 |
|
|
#define TCPCTL_DO_RFC1644 2 /* use RFC-1644 extensions */
|
| 351 |
|
|
#define TCPCTL_MSSDFLT 3 /* MSS default */
|
| 352 |
|
|
#define TCPCTL_STATS 4 /* statistics (read-only) */
|
| 353 |
|
|
#define TCPCTL_RTTDFLT 5 /* default RTT estimate */
|
| 354 |
|
|
#define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
|
| 355 |
|
|
#define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
|
| 356 |
|
|
#define TCPCTL_SENDSPACE 8 /* send buffer space */
|
| 357 |
|
|
#define TCPCTL_RECVSPACE 9 /* receive buffer space */
|
| 358 |
|
|
#define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
|
| 359 |
|
|
#define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
|
| 360 |
|
|
#define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
|
| 361 |
|
|
#define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
|
| 362 |
|
|
#define TCPCTL_MAXID 14
|
| 363 |
|
|
|
| 364 |
|
|
#define TCPCTL_NAMES { \
|
| 365 |
|
|
{ 0, 0 }, \
|
| 366 |
|
|
{ "rfc1323", CTLTYPE_INT }, \
|
| 367 |
|
|
{ "rfc1644", CTLTYPE_INT }, \
|
| 368 |
|
|
{ "mssdflt", CTLTYPE_INT }, \
|
| 369 |
|
|
{ "stats", CTLTYPE_STRUCT }, \
|
| 370 |
|
|
{ "rttdflt", CTLTYPE_INT }, \
|
| 371 |
|
|
{ "keepidle", CTLTYPE_INT }, \
|
| 372 |
|
|
{ "keepintvl", CTLTYPE_INT }, \
|
| 373 |
|
|
{ "sendspace", CTLTYPE_INT }, \
|
| 374 |
|
|
{ "recvspace", CTLTYPE_INT }, \
|
| 375 |
|
|
{ "keepinit", CTLTYPE_INT }, \
|
| 376 |
|
|
{ "pcblist", CTLTYPE_STRUCT }, \
|
| 377 |
|
|
{ "delacktime", CTLTYPE_INT }, \
|
| 378 |
|
|
{ "v6mssdflt", CTLTYPE_INT }, \
|
| 379 |
|
|
}
|
| 380 |
|
|
|
| 381 |
|
|
|
| 382 |
|
|
#ifdef _KERNEL
|
| 383 |
|
|
#ifdef SYSCTL_DECL
|
| 384 |
|
|
SYSCTL_DECL(_net_inet_tcp);
|
| 385 |
|
|
#endif
|
| 386 |
|
|
|
| 387 |
|
|
extern struct inpcbhead tcb; /* head of queue of active tcpcb's */
|
| 388 |
|
|
extern struct inpcbinfo tcbinfo;
|
| 389 |
|
|
extern struct tcpstat tcpstat; /* tcp statistics */
|
| 390 |
|
|
extern int tcp_mssdflt; /* XXX */
|
| 391 |
|
|
extern int tcp_delack_enabled;
|
| 392 |
|
|
extern int tcp_do_newreno;
|
| 393 |
|
|
extern int ss_fltsz;
|
| 394 |
|
|
extern int ss_fltsz_local;
|
| 395 |
|
|
|
| 396 |
|
|
void tcp_canceltimers __P((struct tcpcb *));
|
| 397 |
|
|
struct tcpcb *
|
| 398 |
|
|
tcp_close __P((struct tcpcb *));
|
| 399 |
|
|
void tcp_ctlinput __P((int, struct sockaddr *, void *));
|
| 400 |
|
|
int tcp_ctloutput __P((struct socket *, struct sockopt *));
|
| 401 |
|
|
struct tcpcb *
|
| 402 |
|
|
tcp_drop __P((struct tcpcb *, int));
|
| 403 |
|
|
void tcp_drain __P((void));
|
| 404 |
|
|
void tcp_fasttimo __P((void));
|
| 405 |
|
|
struct rmxp_tao *
|
| 406 |
|
|
tcp_gettaocache __P((struct inpcb *));
|
| 407 |
|
|
void tcp_init __P((void));
|
| 408 |
|
|
void tcp_input __P((struct mbuf *, int));
|
| 409 |
|
|
void tcp_mss __P((struct tcpcb *, int));
|
| 410 |
|
|
int tcp_mssopt __P((struct tcpcb *));
|
| 411 |
|
|
void tcp_drop_syn_sent __P((struct inpcb *, int));
|
| 412 |
|
|
void tcp_mtudisc __P((struct inpcb *, int));
|
| 413 |
|
|
struct tcpcb *
|
| 414 |
|
|
tcp_newtcpcb __P((struct inpcb *));
|
| 415 |
|
|
int tcp_output __P((struct tcpcb *));
|
| 416 |
|
|
void tcp_quench __P((struct inpcb *, int));
|
| 417 |
|
|
void tcp_respond __P((struct tcpcb *, void *,
|
| 418 |
|
|
struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int));
|
| 419 |
|
|
struct rtentry *
|
| 420 |
|
|
tcp_rtlookup __P((struct inpcb *));
|
| 421 |
|
|
void tcp_setpersist __P((struct tcpcb *));
|
| 422 |
|
|
void tcp_slowtimo __P((void));
|
| 423 |
|
|
struct tcptemp *
|
| 424 |
|
|
tcp_maketemplate __P((struct tcpcb *));
|
| 425 |
|
|
void tcp_fillheaders __P((struct tcpcb *, void *, void *));
|
| 426 |
|
|
struct tcpcb *
|
| 427 |
|
|
tcp_timers __P((struct tcpcb *, int));
|
| 428 |
|
|
void tcp_trace __P((int, int, struct tcpcb *, void *, struct tcphdr *,
|
| 429 |
|
|
int));
|
| 430 |
|
|
|
| 431 |
|
|
extern struct pr_usrreqs tcp_usrreqs;
|
| 432 |
|
|
extern u_long tcp_sendspace;
|
| 433 |
|
|
extern u_long tcp_recvspace;
|
| 434 |
|
|
tcp_seq tcp_new_isn __P((struct tcpcb *));
|
| 435 |
|
|
|
| 436 |
|
|
#endif /* _KERNEL */
|
| 437 |
|
|
|
| 438 |
|
|
#endif /* _NETINET_TCP_VAR_H_ */
|
