770 lines
30 KiB
C
770 lines
30 KiB
C
/* $NetBSD: tcp_var.h,v 1.94 2002/11/02 07:28:15 perry Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* 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. Neither the name of the project 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 PROJECT 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 PROJECT 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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/*
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* @(#)COPYRIGHT 1.1 (NRL) 17 January 1995
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*
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* NRL grants permission for redistribution and use in source and binary
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* forms, with or without modification, of the software and documentation
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* created at NRL provided that the following conditions are met:
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*
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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 acknowledgements:
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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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* This product includes software developed at the Information
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* Technology Division, US Naval Research Laboratory.
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* 4. Neither the name of the NRL 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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* THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS
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* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* The views and conclusions contained in the software and documentation
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* are those of the authors and should not be interpreted as representing
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* official policies, either expressed or implied, of the US Naval
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* Research Laboratory (NRL).
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*/
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/*-
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* Copyright (c) 1997, 1998, 1999, 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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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 NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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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*/
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#ifndef _NETINET_TCP_VAR_H_
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#define _NETINET_TCP_VAR_H_
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#if defined(_KERNEL_OPT)
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#include "opt_inet.h"
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#endif
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/*
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* Kernel variables for tcp.
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*/
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#include <sys/callout.h>
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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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int t_family; /* address family on the wire */
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struct ipqehead segq; /* sequencing queue */
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struct callout t_timer[TCPT_NTIMERS];/* tcp timers */
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short t_state; /* state of this connection */
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short t_rxtshift; /* log(2) of rexmt exp. backoff */
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uint32_t t_rxtcur; /* current retransmit value */
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short t_dupacks; /* consecutive dup acks recd */
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u_short t_peermss; /* peer's maximum segment size */
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u_short t_ourmss; /* our's maximum segment size */
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u_short t_segsz; /* current segment size in use */
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char t_force; /* 1 if forcing out a byte */
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u_int 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_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_SYN_REXMT 0x0400 /* rexmit timer fired on SYN */
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#define TF_WILL_SACK 0x0800 /* try to use SACK */
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#define TF_CANT_TXSACK 0x1000 /* other side said I could not SACK */
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#define TF_IGNR_RXSACK 0x2000 /* ignore received SACK blocks */
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#define TF_REASSEMBLING 0x4000 /* we're busy reassembling */
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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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struct in6pcb *t_in6pcb; /* back pointer to internet pcb */
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struct callout t_delack_ch; /* delayed ACK callout */
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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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tcp_seq snd_recover; /* for use in fast recovery */
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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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/*
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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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/*
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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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uint32_t t_rcvtime; /* time last segment received */
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uint32_t t_rtttime; /* time we started measuring rtt */
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tcp_seq t_rtseq; /* sequence number being timed */
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int32_t t_srtt; /* smoothed round-trip time */
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int32_t t_rttvar; /* variance in round-trip time */
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uint32_t 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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u_int32_t ts_timebase; /* our timebase */
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tcp_seq last_ack_sent;
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/* SACK stuff */
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struct ipqehead timeq; /* time sequenced queue (for SACK) */
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/* path MTU discovery blackhole detection */
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int t_mtudisc; /* perform mtudisc for this tcb */
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/* pointer for syn cache entries*/
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LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */
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};
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#ifdef _KERNEL
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/*
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* TCP reassembly queue locks.
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*/
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static __inline int tcp_reass_lock_try __P((struct tcpcb *))
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__attribute__((__unused__));
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static __inline void tcp_reass_unlock __P((struct tcpcb *))
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__attribute__((__unused__));
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static __inline int
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tcp_reass_lock_try(tp)
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struct tcpcb *tp;
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{
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int s;
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/*
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* Use splvm() -- we're blocking things that would cause
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* mbuf allocation.
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*/
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s = splvm();
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if (tp->t_flags & TF_REASSEMBLING) {
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splx(s);
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return (0);
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}
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tp->t_flags |= TF_REASSEMBLING;
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splx(s);
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return (1);
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}
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static __inline void
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tcp_reass_unlock(tp)
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struct tcpcb *tp;
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{
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int s;
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s = splvm();
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tp->t_flags &= ~TF_REASSEMBLING;
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splx(s);
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}
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#ifdef DIAGNOSTIC
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#define TCP_REASS_LOCK(tp) \
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do { \
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if (tcp_reass_lock_try(tp) == 0) { \
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printf("%s:%d: tcpcb %p reass already locked\n", \
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__FILE__, __LINE__, tp); \
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panic("tcp_reass_lock"); \
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} \
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} while (/*CONSTCOND*/ 0)
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#define TCP_REASS_LOCK_CHECK(tp) \
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do { \
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if (((tp)->t_flags & TF_REASSEMBLING) == 0) { \
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printf("%s:%d: tcpcb %p reass lock not held\n", \
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__FILE__, __LINE__, tp); \
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panic("tcp reass lock check"); \
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} \
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} while (/*CONSTCOND*/ 0)
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#else
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#define TCP_REASS_LOCK(tp) (void) tcp_reass_lock_try((tp))
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#define TCP_REASS_LOCK_CHECK(tp) /* nothing */
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#endif
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#define TCP_REASS_UNLOCK(tp) tcp_reass_unlock((tp))
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#endif /* _KERNEL */
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/*
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* Queue for delayed ACK processing.
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*/
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#ifdef _KERNEL
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extern int tcp_delack_ticks;
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void tcp_delack(void *);
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#define TCP_RESTART_DELACK(tp) \
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callout_reset(&(tp)->t_delack_ch, tcp_delack_ticks, \
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tcp_delack, tp)
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#define TCP_SET_DELACK(tp) \
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do { \
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if (((tp)->t_flags & TF_DELACK) == 0) { \
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(tp)->t_flags |= TF_DELACK; \
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TCP_RESTART_DELACK(tp); \
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} \
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} while (/*CONSTCOND*/0)
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#define TCP_CLEAR_DELACK(tp) \
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do { \
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if ((tp)->t_flags & TF_DELACK) { \
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(tp)->t_flags &= ~TF_DELACK; \
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callout_stop(&(tp)->t_delack_ch); \
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} \
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} while (/*CONSTCOND*/0)
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#endif /* _KERNEL */
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/*
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* Compute the current timestamp for a connection.
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*/
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#define TCP_TIMESTAMP(tp) (tcp_now - (tp)->ts_timebase)
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/*
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* Handy way of passing around TCP option info.
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*/
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struct tcp_opt_info {
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int ts_present;
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u_int32_t ts_val;
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u_int32_t ts_ecr;
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u_int16_t maxseg;
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};
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/*
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* Data for the TCP compressed state engine.
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*/
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union syn_cache_sa {
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struct sockaddr sa;
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struct sockaddr_in sin;
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#if 1 /*def INET6*/
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struct sockaddr_in6 sin6;
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#endif
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};
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struct syn_cache {
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TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */
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struct callout sc_timer; /* rexmt timer */
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union { /* cached route */
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struct route route4;
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#ifdef INET6
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struct route_in6 route6;
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#endif
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} sc_route_u;
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#define sc_route4 sc_route_u.route4
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#ifdef INET6
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#define sc_route6 sc_route_u.route6
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#endif
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long sc_win; /* advertised window */
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int sc_bucketidx; /* our bucket index */
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u_int32_t sc_hash;
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u_int32_t sc_timestamp; /* timestamp from SYN */
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u_int32_t sc_timebase; /* our local timebase */
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union syn_cache_sa sc_src;
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union syn_cache_sa sc_dst;
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tcp_seq sc_irs;
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tcp_seq sc_iss;
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u_int sc_rxtcur; /* current rxt timeout */
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u_int sc_rxttot; /* total time spend on queues */
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u_short sc_rxtshift; /* for computing backoff */
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u_short sc_flags;
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#define SCF_UNREACH 0x0001 /* we've had an unreach error */
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#define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */
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struct mbuf *sc_ipopts; /* IP options */
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u_int16_t sc_peermaxseg;
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u_int16_t sc_ourmaxseg;
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u_int8_t sc_request_r_scale : 4,
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sc_requested_s_scale : 4;
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struct tcpcb *sc_tp; /* tcb for listening socket */
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LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */
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};
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struct syn_cache_head {
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TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */
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u_short sch_length; /* # entries in bucket */
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};
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#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
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#ifdef INET6
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#define in6totcpcb(ip) ((struct tcpcb *)(ip)->in6p_ppcb)
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#endif
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#ifndef INET6
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#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
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#else
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#define sototcpcb(so) (((so)->so_proto->pr_domain->dom_family == AF_INET) \
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? intotcpcb(sotoinpcb(so)) \
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: in6totcpcb(sotoin6pcb(so)))
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#endif
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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_SHIFT 3 /* shift for srtt; 3 bits frac. */
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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
|
|
* 1.5 tick we need. But, because the bias is
|
|
* statistical, we have to test that we don't drop below
|
|
* the minimum feasible timer (which is 2 ticks).
|
|
* This macro assumes that the value of 1<<TCP_RTTVAR_SHIFT
|
|
* is the same as the multiplier for rttvar.
|
|
*/
|
|
#define TCP_REXMTVAL(tp) \
|
|
((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> 2)
|
|
|
|
/*
|
|
* Compute the initial window for slow start.
|
|
*/
|
|
#define TCP_INITIAL_WINDOW(iw, segsz) \
|
|
(((iw) == 0) ? (min(4 * (segsz), max(2 * (segsz), 4380))) : \
|
|
((segsz) * (iw)))
|
|
|
|
/*
|
|
* TCP statistics.
|
|
* Many of these should be kept per connection,
|
|
* but that's inconvenient at the moment.
|
|
*/
|
|
struct tcpstat {
|
|
u_quad_t tcps_connattempt; /* connections initiated */
|
|
u_quad_t tcps_accepts; /* connections accepted */
|
|
u_quad_t tcps_connects; /* connections established */
|
|
u_quad_t tcps_drops; /* connections dropped */
|
|
u_quad_t tcps_conndrops; /* embryonic connections dropped */
|
|
u_quad_t tcps_closed; /* conn. closed (includes drops) */
|
|
u_quad_t tcps_segstimed; /* segs where we tried to get rtt */
|
|
u_quad_t tcps_rttupdated; /* times we succeeded */
|
|
u_quad_t tcps_delack; /* delayed acks sent */
|
|
u_quad_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
|
|
u_quad_t tcps_rexmttimeo; /* retransmit timeouts */
|
|
u_quad_t tcps_persisttimeo; /* persist timeouts */
|
|
u_quad_t tcps_keeptimeo; /* keepalive timeouts */
|
|
u_quad_t tcps_keepprobe; /* keepalive probes sent */
|
|
u_quad_t tcps_keepdrops; /* connections dropped in keepalive */
|
|
u_quad_t tcps_persistdrops; /* connections dropped in persist */
|
|
u_quad_t tcps_connsdrained; /* connections drained due to memory
|
|
shortage */
|
|
u_quad_t tcps_pmtublackhole; /* PMTUD blackhole detected */
|
|
|
|
u_quad_t tcps_sndtotal; /* total packets sent */
|
|
u_quad_t tcps_sndpack; /* data packets sent */
|
|
u_quad_t tcps_sndbyte; /* data bytes sent */
|
|
u_quad_t tcps_sndrexmitpack; /* data packets retransmitted */
|
|
u_quad_t tcps_sndrexmitbyte; /* data bytes retransmitted */
|
|
u_quad_t tcps_sndacks; /* ack-only packets sent */
|
|
u_quad_t tcps_sndprobe; /* window probes sent */
|
|
u_quad_t tcps_sndurg; /* packets sent with URG only */
|
|
u_quad_t tcps_sndwinup; /* window update-only packets sent */
|
|
u_quad_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
|
|
|
|
u_quad_t tcps_rcvtotal; /* total packets received */
|
|
u_quad_t tcps_rcvpack; /* packets received in sequence */
|
|
u_quad_t tcps_rcvbyte; /* bytes received in sequence */
|
|
u_quad_t tcps_rcvbadsum; /* packets received with ccksum errs */
|
|
u_quad_t tcps_rcvbadoff; /* packets received with bad offset */
|
|
u_quad_t tcps_rcvmemdrop; /* packets dropped for lack of memory */
|
|
u_quad_t tcps_rcvshort; /* packets received too short */
|
|
u_quad_t tcps_rcvduppack; /* duplicate-only packets received */
|
|
u_quad_t tcps_rcvdupbyte; /* duplicate-only bytes received */
|
|
u_quad_t tcps_rcvpartduppack; /* packets with some duplicate data */
|
|
u_quad_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
|
|
u_quad_t tcps_rcvoopack; /* out-of-order packets received */
|
|
u_quad_t tcps_rcvoobyte; /* out-of-order bytes received */
|
|
u_quad_t tcps_rcvpackafterwin; /* packets with data after window */
|
|
u_quad_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
|
|
u_quad_t tcps_rcvafterclose; /* packets rcvd after "close" */
|
|
u_quad_t tcps_rcvwinprobe; /* rcvd window probe packets */
|
|
u_quad_t tcps_rcvdupack; /* rcvd duplicate acks */
|
|
u_quad_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
|
|
u_quad_t tcps_rcvackpack; /* rcvd ack packets */
|
|
u_quad_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
|
|
u_quad_t tcps_rcvwinupd; /* rcvd window update packets */
|
|
u_quad_t tcps_pawsdrop; /* segments dropped due to PAWS */
|
|
u_quad_t tcps_predack; /* times hdr predict ok for acks */
|
|
u_quad_t tcps_preddat; /* times hdr predict ok for data pkts */
|
|
|
|
u_quad_t tcps_pcbhashmiss; /* input packets missing pcb hash */
|
|
u_quad_t tcps_noport; /* no socket on port */
|
|
u_quad_t tcps_badsyn; /* received ack for which we have
|
|
no SYN in compressed state */
|
|
|
|
/* These statistics deal with the SYN cache. */
|
|
u_quad_t tcps_sc_added; /* # of entries added */
|
|
u_quad_t tcps_sc_completed; /* # of connections completed */
|
|
u_quad_t tcps_sc_timed_out; /* # of entries timed out */
|
|
u_quad_t tcps_sc_overflowed; /* # dropped due to overflow */
|
|
u_quad_t tcps_sc_reset; /* # dropped due to RST */
|
|
u_quad_t tcps_sc_unreach; /* # dropped due to ICMP unreach */
|
|
u_quad_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */
|
|
u_quad_t tcps_sc_aborted; /* # of entries aborted (no mem) */
|
|
u_quad_t tcps_sc_dupesyn; /* # of duplicate SYNs received */
|
|
u_quad_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */
|
|
u_quad_t tcps_sc_collisions; /* # of hash collisions */
|
|
u_quad_t tcps_sc_retransmitted; /* # of retransmissions */
|
|
|
|
u_quad_t tcps_selfquench; /* # of ENOBUFS we get on output */
|
|
};
|
|
|
|
/*
|
|
* Names for TCP sysctl objects.
|
|
*/
|
|
#define TCPCTL_RFC1323 1 /* RFC1323 timestamps/scaling */
|
|
#define TCPCTL_SENDSPACE 2 /* default send buffer */
|
|
#define TCPCTL_RECVSPACE 3 /* default recv buffer */
|
|
#define TCPCTL_MSSDFLT 4 /* default seg size */
|
|
#define TCPCTL_SYN_CACHE_LIMIT 5 /* max size of comp. state engine */
|
|
#define TCPCTL_SYN_BUCKET_LIMIT 6 /* max size of hash bucket */
|
|
#if 0 /*obsoleted*/
|
|
#define TCPCTL_SYN_CACHE_INTER 7 /* interval of comp. state timer */
|
|
#endif
|
|
#define TCPCTL_INIT_WIN 8 /* initial window */
|
|
#define TCPCTL_MSS_IFMTU 9 /* mss from interface, not in_maxmtu */
|
|
#define TCPCTL_SACK 10 /* RFC2018 selective acknowledgement */
|
|
#define TCPCTL_WSCALE 11 /* RFC1323 window scaling */
|
|
#define TCPCTL_TSTAMP 12 /* RFC1323 timestamps */
|
|
#define TCPCTL_COMPAT_42 13 /* 4.2BSD TCP bug work-arounds */
|
|
#define TCPCTL_CWM 14 /* Congestion Window Monitoring */
|
|
#define TCPCTL_CWM_BURSTSIZE 15 /* burst size allowed by CWM */
|
|
#define TCPCTL_ACK_ON_PUSH 16 /* ACK immediately on PUSH */
|
|
#define TCPCTL_KEEPIDLE 17 /* keepalive idle time */
|
|
#define TCPCTL_KEEPINTVL 18 /* keepalive probe interval */
|
|
#define TCPCTL_KEEPCNT 19 /* keepalive count */
|
|
#define TCPCTL_SLOWHZ 20 /* PR_SLOWHZ (read-only) */
|
|
#define TCPCTL_NEWRENO 21 /* NewReno Congestion Control */
|
|
#define TCPCTL_LOG_REFUSED 22 /* Log refused connections */
|
|
#if 0 /*obsoleted*/
|
|
#define TCPCTL_RSTRATELIMIT 23 /* RST rate limit */
|
|
#endif
|
|
#define TCPCTL_RSTPPSLIMIT 24 /* RST pps limit */
|
|
#define TCPCTL_DELACK_TICKS 25 /* # ticks to delay ACK */
|
|
#define TCPCTL_MAXID 26
|
|
|
|
#define TCPCTL_NAMES { \
|
|
{ 0, 0 }, \
|
|
{ "rfc1323", CTLTYPE_INT }, \
|
|
{ "sendspace", CTLTYPE_INT }, \
|
|
{ "recvspace", CTLTYPE_INT }, \
|
|
{ "mssdflt", CTLTYPE_INT }, \
|
|
{ "syn_cache_limit", CTLTYPE_INT }, \
|
|
{ "syn_bucket_limit", CTLTYPE_INT }, \
|
|
{ 0, 0 },\
|
|
{ "init_win", CTLTYPE_INT }, \
|
|
{ "mss_ifmtu", CTLTYPE_INT }, \
|
|
{ "sack", CTLTYPE_INT }, \
|
|
{ "win_scale", CTLTYPE_INT }, \
|
|
{ "timestamps", CTLTYPE_INT }, \
|
|
{ "compat_42", CTLTYPE_INT }, \
|
|
{ "cwm", CTLTYPE_INT }, \
|
|
{ "cwm_burstsize", CTLTYPE_INT }, \
|
|
{ "ack_on_push", CTLTYPE_INT }, \
|
|
{ "keepidle", CTLTYPE_INT }, \
|
|
{ "keepintvl", CTLTYPE_INT }, \
|
|
{ "keepcnt", CTLTYPE_INT }, \
|
|
{ "slowhz", CTLTYPE_INT }, \
|
|
{ "newreno", CTLTYPE_INT }, \
|
|
{ "log_refused",CTLTYPE_INT }, \
|
|
{ 0, 0 }, \
|
|
{ "rstppslimit", CTLTYPE_INT }, \
|
|
{ "delack_ticks", CTLTYPE_INT }, \
|
|
}
|
|
|
|
#ifdef _KERNEL
|
|
extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */
|
|
#ifdef INET6
|
|
extern struct in6pcb tcb6;
|
|
#endif
|
|
extern struct tcpstat tcpstat; /* tcp statistics */
|
|
extern u_int32_t tcp_now; /* for RFC 1323 timestamps */
|
|
extern int tcp_do_rfc1323; /* enabled/disabled? */
|
|
extern int tcp_do_sack; /* SACK enabled/disabled? */
|
|
extern int tcp_do_win_scale; /* RFC1323 window scaling enabled/disabled? */
|
|
extern int tcp_do_timestamps; /* RFC1323 timestamps enabled/disabled? */
|
|
extern int tcp_do_newreno; /* Use the New Reno algorithms */
|
|
extern int tcp_mssdflt; /* default seg size */
|
|
extern int tcp_init_win; /* initial window */
|
|
extern int tcp_mss_ifmtu; /* take MSS from interface, not in_maxmtu */
|
|
extern int tcp_compat_42; /* work around ancient broken TCP peers */
|
|
extern int tcp_cwm; /* enable Congestion Window Monitoring */
|
|
extern int tcp_cwm_burstsize; /* burst size allowed by CWM */
|
|
extern int tcp_ack_on_push; /* ACK immediately on PUSH */
|
|
extern int tcp_syn_cache_limit; /* max entries for compressed state engine */
|
|
extern int tcp_syn_bucket_limit;/* max entries per hash bucket */
|
|
extern int tcp_log_refused; /* log refused connections */
|
|
|
|
extern int tcp_rst_ppslim;
|
|
|
|
extern int tcp_syn_cache_size;
|
|
extern struct syn_cache_head tcp_syn_cache[];
|
|
extern u_long syn_cache_count;
|
|
|
|
#define TCPCTL_VARIABLES { \
|
|
{ 0 }, \
|
|
{ 1, 0, &tcp_do_rfc1323 }, \
|
|
{ 1, 0, &tcp_sendspace }, \
|
|
{ 1, 0, &tcp_recvspace }, \
|
|
{ 1, 0, &tcp_mssdflt }, \
|
|
{ 1, 0, &tcp_syn_cache_limit }, \
|
|
{ 1, 0, &tcp_syn_bucket_limit }, \
|
|
{ 0 }, \
|
|
{ 1, 0, &tcp_init_win }, \
|
|
{ 1, 0, &tcp_mss_ifmtu }, \
|
|
{ 1, 0, &tcp_do_sack }, \
|
|
{ 1, 0, &tcp_do_win_scale }, \
|
|
{ 1, 0, &tcp_do_timestamps }, \
|
|
{ 1, 0, &tcp_compat_42 }, \
|
|
{ 1, 0, &tcp_cwm }, \
|
|
{ 1, 0, &tcp_cwm_burstsize }, \
|
|
{ 1, 0, &tcp_ack_on_push }, \
|
|
{ 1, 0, &tcp_keepidle }, \
|
|
{ 1, 0, &tcp_keepintvl }, \
|
|
{ 1, 0, &tcp_keepcnt }, \
|
|
{ 1, 1, 0, PR_SLOWHZ }, \
|
|
{ 1, 0, &tcp_do_newreno }, \
|
|
{ 1, 0, &tcp_log_refused }, \
|
|
{ 0 }, \
|
|
{ 1, 0, &tcp_rst_ppslim }, \
|
|
{ 1, 0, &tcp_delack_ticks }, \
|
|
}
|
|
|
|
#ifdef __NO_STRICT_ALIGNMENT
|
|
#define TCP_HDR_ALIGNED_P(th) 1
|
|
#else
|
|
#define TCP_HDR_ALIGNED_P(th) ((((vaddr_t) (th)) & 3) == 0)
|
|
#endif
|
|
|
|
int tcp_attach __P((struct socket *));
|
|
void tcp_canceltimers __P((struct tcpcb *));
|
|
struct tcpcb *
|
|
tcp_close __P((struct tcpcb *));
|
|
#ifdef INET6
|
|
void tcp6_ctlinput __P((int, struct sockaddr *, void *));
|
|
#endif
|
|
void *tcp_ctlinput __P((int, struct sockaddr *, void *));
|
|
int tcp_ctloutput __P((int, struct socket *, int, int, struct mbuf **));
|
|
struct tcpcb *
|
|
tcp_disconnect __P((struct tcpcb *));
|
|
struct tcpcb *
|
|
tcp_drop __P((struct tcpcb *, int));
|
|
void tcp_dooptions __P((struct tcpcb *,
|
|
u_char *, int, struct tcphdr *, struct tcp_opt_info *));
|
|
void tcp_drain __P((void));
|
|
#ifdef INET6
|
|
void tcp6_drain __P((void));
|
|
#endif
|
|
void tcp_established __P((struct tcpcb *));
|
|
void tcp_init __P((void));
|
|
#ifdef INET6
|
|
int tcp6_input __P((struct mbuf **, int *, int));
|
|
#endif
|
|
void tcp_input __P((struct mbuf *, ...));
|
|
u_long tcp_mss_to_advertise __P((const struct ifnet *, int));
|
|
void tcp_mss_from_peer __P((struct tcpcb *, int));
|
|
struct tcpcb *
|
|
tcp_newtcpcb __P((int, void *));
|
|
void tcp_notify __P((struct inpcb *, int));
|
|
#ifdef INET6
|
|
void tcp6_notify __P((struct in6pcb *, int));
|
|
#endif
|
|
u_int tcp_optlen __P((struct tcpcb *));
|
|
int tcp_output __P((struct tcpcb *));
|
|
void tcp_pulloutofband __P((struct socket *,
|
|
struct tcphdr *, struct mbuf *, int));
|
|
void tcp_quench __P((struct inpcb *, int));
|
|
#ifdef INET6
|
|
void tcp6_quench __P((struct in6pcb *, int));
|
|
#endif
|
|
int tcp_reass __P((struct tcpcb *, struct tcphdr *, struct mbuf *, int *));
|
|
int tcp_respond __P((struct tcpcb *, struct mbuf *, struct mbuf *,
|
|
struct tcphdr *, tcp_seq, tcp_seq, int));
|
|
void tcp_rmx_rtt __P((struct tcpcb *));
|
|
void tcp_setpersist __P((struct tcpcb *));
|
|
void tcp_slowtimo __P((void));
|
|
struct mbuf *
|
|
tcp_template __P((struct tcpcb *));
|
|
void tcp_trace __P((int, int, struct tcpcb *, struct mbuf *, int));
|
|
struct tcpcb *
|
|
tcp_usrclosed __P((struct tcpcb *));
|
|
int tcp_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));
|
|
int tcp_usrreq __P((struct socket *,
|
|
int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *));
|
|
void tcp_xmit_timer __P((struct tcpcb *, uint32_t));
|
|
tcp_seq tcp_new_iss __P((struct tcpcb *, tcp_seq));
|
|
tcp_seq tcp_new_iss1 __P((void *, void *, u_int16_t, u_int16_t, size_t,
|
|
tcp_seq));
|
|
|
|
int syn_cache_add __P((struct sockaddr *, struct sockaddr *,
|
|
struct tcphdr *, unsigned int, struct socket *,
|
|
struct mbuf *, u_char *, int, struct tcp_opt_info *));
|
|
void syn_cache_unreach __P((struct sockaddr *, struct sockaddr *,
|
|
struct tcphdr *));
|
|
struct socket *syn_cache_get __P((struct sockaddr *, struct sockaddr *,
|
|
struct tcphdr *, unsigned int, unsigned int,
|
|
struct socket *so, struct mbuf *));
|
|
void syn_cache_init __P((void));
|
|
void syn_cache_insert __P((struct syn_cache *, struct tcpcb *));
|
|
struct syn_cache *syn_cache_lookup __P((struct sockaddr *, struct sockaddr *,
|
|
struct syn_cache_head **));
|
|
void syn_cache_reset __P((struct sockaddr *, struct sockaddr *,
|
|
struct tcphdr *));
|
|
int syn_cache_respond __P((struct syn_cache *, struct mbuf *));
|
|
void syn_cache_timer __P((void *));
|
|
void syn_cache_cleanup __P((struct tcpcb *));
|
|
|
|
int tcp_newreno __P((struct tcpcb *, struct tcphdr *));
|
|
#endif
|
|
|
|
#endif /* _NETINET_TCP_VAR_H_ */
|