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phoenix |
//==========================================================================
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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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//
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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 or other sources,
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// and are covered by the appropriate copyright disclaimers included herein.
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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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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): gthomas
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// Contributors: gthomas
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// Date: 2000-01-10
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// Purpose:
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// Description:
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//
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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/* $OpenBSD: tcp_var.h,v 1.25 1999/12/08 06:50:20 itojun Exp $ */
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/* $NetBSD: tcp_var.h,v 1.17 1996/02/13 23:44:24 christos Exp $ */
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/*
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* Copyright (c) 1982, 1986, 1993, 1994
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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 8.3 (Berkeley) 4/10/94
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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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struct sackblk {
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tcp_seq start; /* start seq no. of sack block */
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tcp_seq end; /* end seq no. */
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};
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struct sackhole {
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tcp_seq start; /* start seq no. of hole */
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tcp_seq end; /* end seq no. */
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int dups; /* number of dup(s)acks for this hole */
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tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
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struct sackhole *next; /* next in list */
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};
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/*
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* Kernel variables for tcp.
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*/
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/*
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* Tcp control block, one per tcp; fields:
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*/
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struct tcpcb {
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struct ipqehead segq; /* sequencing queue */
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short t_state; /* state of this connection */
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short t_timer[TCPT_NTIMERS]; /* tcp timers */
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short t_rxtshift; /* log(2) of rexmt exp. backoff */
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short t_rxtcur; /* current retransmit value */
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short t_dupacks; /* consecutive dup acks recd */
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u_short t_maxseg; /* maximum segment size */
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char t_force; /* 1 if forcing out a byte */
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u_short t_flags;
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#define TF_ACKNOW 0x0001 /* ack peer immediately */
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#define TF_DELACK 0x0002 /* ack, but try to delay it */
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#define TF_NODELAY 0x0004 /* don't delay packets to coalesce */
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#define TF_NOOPT 0x0008 /* don't use tcp options */
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#define TF_SENTFIN 0x0010 /* have sent FIN */
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#define TF_REQ_SCALE 0x0020 /* have/will request window scaling */
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#define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */
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#define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */
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#define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */
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#define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */
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#define TF_SIGNATURE 0x0400 /* require TCP MD5 signature */
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struct mbuf *t_template; /* skeletal packet for transmit */
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struct inpcb *t_inpcb; /* back pointer to internet pcb */
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/*
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* The following fields are used as in the protocol specification.
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* See RFC783, Dec. 1981, page 21.
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*/
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/* send sequence variables */
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tcp_seq snd_una; /* send unacknowledged */
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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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u_long snd_wnd; /* send window */
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#ifdef TCP_SACK
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int sack_disable; /* disable SACK for this connection */
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int snd_numholes; /* number of holes seen by sender */
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struct sackhole *snd_holes; /* linked list of holes (sorted) */
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#if defined(TCP_SACK) && defined(TCP_FACK)
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tcp_seq snd_fack; /* for FACK congestion control */
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u_long snd_awnd; /* snd_nxt - snd_fack + */
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/* retransmitted data */
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int retran_data; /* amount of outstanding retx. data */
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#endif /* TCP_FACK */
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#endif /* TCP_SACK */
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#if defined(TCP_SACK) || defined(TCP_NEWRENO)
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tcp_seq snd_last; /* for use in fast recovery */
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#endif
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/* receive sequence variables */
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u_long rcv_wnd; /* receive window */
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tcp_seq rcv_nxt; /* receive next */
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tcp_seq rcv_up; /* receive urgent pointer */
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tcp_seq irs; /* initial receive sequence number */
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#ifdef TCP_SACK
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tcp_seq rcv_laststart; /* start of last segment recd. */
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tcp_seq rcv_lastend; /* end of ... */
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tcp_seq rcv_lastsack; /* last seq number(+1) sack'd by rcv'r*/
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int rcv_numsacks; /* # distinct sack blks present */
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struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
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#endif
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/*
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* Additional variables for this implementation.
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*/
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/* receive variables */
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tcp_seq rcv_adv; /* advertised window */
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/* retransmit variables */
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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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/* congestion control (for slow start, source quench, retransmit after loss) */
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u_long snd_cwnd; /* congestion-controlled window */
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u_long snd_ssthresh; /* snd_cwnd size threshhold for
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* for slow start exponential to
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* linear switch
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*/
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u_int t_maxopd; /* mss plus options */
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/*
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* transmit timing stuff. See below for scale of srtt and rttvar.
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* "Variance" is actually smoothed difference.
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*/
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short t_idle; /* inactivity time */
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short t_rtt; /* round trip time */
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tcp_seq t_rtseq; /* sequence number being timed */
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short t_srtt; /* smoothed round-trip time */
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short t_rttvar; /* variance in round-trip time */
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u_short t_rttmin; /* minimum rtt allowed */
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u_long max_sndwnd; /* largest window peer has offered */
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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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short t_softerror; /* possible error not yet reported */
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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_int32_t ts_recent; /* timestamp echo data */
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u_int32_t ts_recent_age; /* when last updated */
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tcp_seq last_ack_sent;
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/* TUBA stuff */
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caddr_t t_tuba_pcb; /* next level down pcb for TCP over z */
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int pf;
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};
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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 8 /* multiplier for srtt; 3 bits frac. */
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#define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */
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#define TCP_RTTVAR_SCALE 4 /* multiplier for rttvar; 2 bits */
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#define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */
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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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* This macro assumes that the value of TCP_RTTVAR_SCALE
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* is the same as the multiplier for rttvar.
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*/
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#define TCP_REXMTVAL(tp) \
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((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2)
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/*
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* TCP statistics.
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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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struct tcpstat {
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u_int32_t tcps_connattempt; /* connections initiated */
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u_int32_t tcps_accepts; /* connections accepted */
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u_int32_t tcps_connects; /* connections established */
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u_int32_t tcps_drops; /* connections dropped */
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u_int32_t tcps_conndrops; /* embryonic connections dropped */
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u_int32_t tcps_closed; /* conn. closed (includes drops) */
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u_int32_t tcps_segstimed; /* segs where we tried to get rtt */
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u_int32_t tcps_rttupdated; /* times we succeeded */
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u_int32_t tcps_delack; /* delayed acks sent */
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u_int32_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
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u_int32_t tcps_rexmttimeo; /* retransmit timeouts */
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u_int32_t tcps_persisttimeo; /* persist timeouts */
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u_int32_t tcps_persistdrop; /* connections dropped in persist */
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u_int32_t tcps_keeptimeo; /* keepalive timeouts */
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u_int32_t tcps_keepprobe; /* keepalive probes sent */
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u_int32_t tcps_keepdrops; /* connections dropped in keepalive */
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u_int32_t tcps_sndtotal; /* total packets sent */
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u_int32_t tcps_sndpack; /* data packets sent */
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u_int64_t tcps_sndbyte; /* data bytes sent */
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u_int32_t tcps_sndrexmitpack; /* data packets retransmitted */
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u_int64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
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u_int64_t tcps_sndrexmitfast; /* Fast retransmits */
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u_int32_t tcps_sndacks; /* ack-only packets sent */
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u_int32_t tcps_sndprobe; /* window probes sent */
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u_int32_t tcps_sndurg; /* packets sent with URG only */
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u_int32_t tcps_sndwinup; /* window update-only packets sent */
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u_int32_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
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u_int32_t tcps_rcvtotal; /* total packets received */
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u_int32_t tcps_rcvpack; /* packets received in sequence */
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u_int64_t tcps_rcvbyte; /* bytes received in sequence */
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u_int32_t tcps_rcvbadsum; /* packets received with ccksum errs */
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u_int32_t tcps_rcvbadoff; /* packets received with bad offset */
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u_int32_t tcps_rcvmemdrop; /* packets dropped for lack of memory */
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u_int32_t tcps_rcvnosec; /* packets dropped for lack of ipsec */
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u_int32_t tcps_rcvshort; /* packets received too short */
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u_int32_t tcps_rcvduppack; /* duplicate-only packets received */
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u_int64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
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u_int32_t tcps_rcvpartduppack; /* packets with some duplicate data */
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u_int64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
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u_int32_t tcps_rcvoopack; /* out-of-order packets received */
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u_int64_t tcps_rcvoobyte; /* out-of-order bytes received */
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u_int32_t tcps_rcvpackafterwin; /* packets with data after window */
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u_int64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
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u_int32_t tcps_rcvafterclose; /* packets rcvd after "close" */
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u_int32_t tcps_rcvwinprobe; /* rcvd window probe packets */
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u_int32_t tcps_rcvdupack; /* rcvd duplicate acks */
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u_int32_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
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| 296 |
|
|
u_int32_t tcps_rcvackpack; /* rcvd ack packets */
|
| 297 |
|
|
u_int64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
|
| 298 |
|
|
u_int32_t tcps_rcvwinupd; /* rcvd window update packets */
|
| 299 |
|
|
u_int32_t tcps_pawsdrop; /* segments dropped due to PAWS */
|
| 300 |
|
|
u_int32_t tcps_predack; /* times hdr predict ok for acks */
|
| 301 |
|
|
u_int32_t tcps_preddat; /* times hdr predict ok for data pkts */
|
| 302 |
|
|
|
| 303 |
|
|
u_int32_t tcps_pcbhashmiss; /* input packets missing pcb hash */
|
| 304 |
|
|
u_int32_t tcps_noport; /* no socket on port */
|
| 305 |
|
|
u_int32_t tcps_badsyn; /* SYN packet with src==dst rcv'ed */
|
| 306 |
|
|
|
| 307 |
|
|
u_int32_t tcps_rcvbadsig; /* rcvd bad/missing TCP signatures */
|
| 308 |
|
|
u_int64_t tcps_rcvgoodsig; /* rcvd good TCP signatures */
|
| 309 |
|
|
};
|
| 310 |
|
|
|
| 311 |
|
|
/*
|
| 312 |
|
|
* Names for TCP sysctl objects.
|
| 313 |
|
|
*/
|
| 314 |
|
|
|
| 315 |
|
|
#define TCPCTL_RFC1323 1 /* enable/disable RFC1323 timestamps/scaling */
|
| 316 |
|
|
#define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */
|
| 317 |
|
|
#define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */
|
| 318 |
|
|
#define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */
|
| 319 |
|
|
#define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */
|
| 320 |
|
|
#define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */
|
| 321 |
|
|
#define TCPCTL_RECVSPACE 7 /* receive buffer space */
|
| 322 |
|
|
#define TCPCTL_SENDSPACE 8 /* send buffer space */
|
| 323 |
|
|
#define TCPCTL_IDENT 9 /* get connection owner */
|
| 324 |
|
|
#define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */
|
| 325 |
|
|
#define TCPCTL_MSSDFLT 11 /* Default maximum segment size */
|
| 326 |
|
|
#define TCPCTL_MAXID 12
|
| 327 |
|
|
|
| 328 |
|
|
#define TCPCTL_NAMES { \
|
| 329 |
|
|
{ 0, 0 }, \
|
| 330 |
|
|
{ "rfc1323", CTLTYPE_INT }, \
|
| 331 |
|
|
{ "keepinittime", CTLTYPE_INT }, \
|
| 332 |
|
|
{ "keepidle", CTLTYPE_INT }, \
|
| 333 |
|
|
{ "keepintvl", CTLTYPE_INT }, \
|
| 334 |
|
|
{ "slowhz", CTLTYPE_INT }, \
|
| 335 |
|
|
{ "baddynamic", CTLTYPE_STRUCT }, \
|
| 336 |
|
|
{ "recvspace", CTLTYPE_INT }, \
|
| 337 |
|
|
{ "sendspace", CTLTYPE_INT }, \
|
| 338 |
|
|
{ "ident", CTLTYPE_STRUCT }, \
|
| 339 |
|
|
{ "sack", CTLTYPE_INT }, \
|
| 340 |
|
|
{ "mssdflt", CTLTYPE_INT }, \
|
| 341 |
|
|
}
|
| 342 |
|
|
|
| 343 |
|
|
struct tcp_ident_mapping {
|
| 344 |
|
|
struct sockaddr faddr, laddr;
|
| 345 |
|
|
int euid, ruid;
|
| 346 |
|
|
};
|
| 347 |
|
|
|
| 348 |
|
|
#ifdef _KERNEL
|
| 349 |
|
|
struct inpcbtable tcbtable; /* head of queue of active tcpcb's */
|
| 350 |
|
|
struct tcpstat tcpstat; /* tcp statistics */
|
| 351 |
|
|
u_int32_t tcp_now; /* for RFC 1323 timestamps */
|
| 352 |
|
|
extern int tcp_do_rfc1323; /* enabled/disabled? */
|
| 353 |
|
|
extern int tcp_mssdflt; /* default maximum segment size */
|
| 354 |
|
|
#ifdef TCP_SACK
|
| 355 |
|
|
extern int tcp_do_sack; /* SACK enabled/disabled */
|
| 356 |
|
|
#endif
|
| 357 |
|
|
|
| 358 |
|
|
int tcp_attach __P((struct socket *));
|
| 359 |
|
|
void tcp_canceltimers __P((struct tcpcb *));
|
| 360 |
|
|
struct tcpcb *
|
| 361 |
|
|
tcp_close __P((struct tcpcb *));
|
| 362 |
|
|
#if defined(INET6) && !defined(TCP6)
|
| 363 |
|
|
void tcp6_ctlinput __P((int, struct sockaddr *, void *));
|
| 364 |
|
|
#endif
|
| 365 |
|
|
void *tcp_ctlinput __P((int, struct sockaddr *, void *));
|
| 366 |
|
|
int tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
|
| 367 |
|
|
struct tcpcb *
|
| 368 |
|
|
tcp_disconnect __P((struct tcpcb *));
|
| 369 |
|
|
struct tcpcb *
|
| 370 |
|
|
tcp_drop __P((struct tcpcb *, int));
|
| 371 |
|
|
void tcp_dooptions __P((struct tcpcb *, u_char *, int, struct tcphdr *,
|
| 372 |
|
|
int *, u_int32_t *, u_int32_t *));
|
| 373 |
|
|
void tcp_drain __P((void));
|
| 374 |
|
|
void tcp_fasttimo __P((void));
|
| 375 |
|
|
void tcp_init __P((void));
|
| 376 |
|
|
#if defined(INET6) && !defined(TCP6)
|
| 377 |
|
|
int tcp6_input __P((struct mbuf **, int *, int));
|
| 378 |
|
|
#endif
|
| 379 |
|
|
void tcp_input __P((struct mbuf *, ...));
|
| 380 |
|
|
int tcp_mss __P((struct tcpcb *, u_int));
|
| 381 |
|
|
struct tcpcb *
|
| 382 |
|
|
tcp_newtcpcb __P((struct inpcb *));
|
| 383 |
|
|
void tcp_notify __P((struct inpcb *, int));
|
| 384 |
|
|
int tcp_output __P((struct tcpcb *));
|
| 385 |
|
|
void tcp_pulloutofband __P((struct socket *, u_int, struct mbuf *, int));
|
| 386 |
|
|
void tcp_quench __P((struct inpcb *, int));
|
| 387 |
|
|
int tcp_reass __P((struct tcpcb *, struct tcphdr *, struct mbuf *, int *));
|
| 388 |
|
|
void tcp_respond __P((struct tcpcb *, caddr_t, struct mbuf *, tcp_seq,
|
| 389 |
|
|
tcp_seq, int));
|
| 390 |
|
|
void tcp_setpersist __P((struct tcpcb *));
|
| 391 |
|
|
void tcp_slowtimo __P((void));
|
| 392 |
|
|
struct mbuf *
|
| 393 |
|
|
tcp_template __P((struct tcpcb *));
|
| 394 |
|
|
struct tcpcb *
|
| 395 |
|
|
tcp_timers __P((struct tcpcb *, int));
|
| 396 |
|
|
void tcp_trace __P((int, int, struct tcpcb *, caddr_t, int, int));
|
| 397 |
|
|
struct tcpcb *
|
| 398 |
|
|
tcp_usrclosed __P((struct tcpcb *));
|
| 399 |
|
|
int tcp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
|
| 400 |
|
|
#if defined(INET6) && !defined(TCP6)
|
| 401 |
|
|
int tcp6_usrreq __P((struct socket *,
|
| 402 |
|
|
int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *));
|
| 403 |
|
|
#endif
|
| 404 |
|
|
int tcp_usrreq __P((struct socket *,
|
| 405 |
|
|
int, struct mbuf *, struct mbuf *, struct mbuf *));
|
| 406 |
|
|
void tcp_xmit_timer __P((struct tcpcb *, int));
|
| 407 |
|
|
void tcpdropoldhalfopen __P((struct tcpcb *, u_int16_t));
|
| 408 |
|
|
#ifdef TCP_SACK
|
| 409 |
|
|
int tcp_sack_option __P((struct tcpcb *,struct tcphdr *,u_char *,int));
|
| 410 |
|
|
void tcp_update_sack_list __P((struct tcpcb *tp));
|
| 411 |
|
|
void tcp_del_sackholes __P((struct tcpcb *, struct tcphdr *));
|
| 412 |
|
|
void tcp_clean_sackreport __P((struct tcpcb *tp));
|
| 413 |
|
|
void tcp_sack_adjust __P((struct tcpcb *tp));
|
| 414 |
|
|
struct sackhole *
|
| 415 |
|
|
tcp_sack_output __P((struct tcpcb *tp));
|
| 416 |
|
|
int tcp_sack_partialack __P((struct tcpcb *, struct tcphdr *));
|
| 417 |
|
|
#ifdef DEBUG
|
| 418 |
|
|
void tcp_print_holes __P((struct tcpcb *tp));
|
| 419 |
|
|
#endif
|
| 420 |
|
|
#endif /* TCP_SACK */
|
| 421 |
|
|
#if defined(TCP_NEWRENO) || defined(TCP_SACK)
|
| 422 |
|
|
int tcp_newreno __P((struct tcpcb *, struct tcphdr *));
|
| 423 |
|
|
u_long tcp_seq_subtract __P((u_long, u_long ));
|
| 424 |
|
|
#endif /* TCP_NEWRENO || TCP_SACK */
|
| 425 |
|
|
#ifdef TCP_SIGNATURE
|
| 426 |
|
|
int tcp_signature_apply __P((caddr_t, caddr_t, unsigned int));
|
| 427 |
|
|
#endif /* TCP_SIGNATURE */
|
| 428 |
|
|
|
| 429 |
|
|
#endif /* _KERNEL */
|
| 430 |
|
|
|
| 431 |
|
|
#endif // _NETINET_TCP_VAR_H_
|
