1001 lines
38 KiB
C
1001 lines
38 KiB
C
/* $NetBSD: tcp_var.h,v 1.168 2011/10/31 12:52:19 yamt 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, 2005 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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* This code is derived from software contributed to The NetBSD Foundation
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* by Charles M. Hannum.
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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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*
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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. 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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#include "opt_mbuftrace.h"
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#include "rnd.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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#ifdef TCP_SIGNATURE
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/*
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* Defines which are needed by the xform_tcp module and tcp_[in|out]put
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* for SADB verification and lookup.
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*/
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#define TCP_SIGLEN 16 /* length of computed digest in bytes */
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#define TCP_KEYLEN_MIN 1 /* minimum length of TCP-MD5 key */
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#define TCP_KEYLEN_MAX 80 /* maximum length of TCP-MD5 key */
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/*
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* Only a single SA per host may be specified at this time. An SPI is
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* needed in order for the KEY_ALLOCSA() lookup to work.
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*/
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#define TCP_SIG_SPI 0x1000
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#endif /* TCP_SIGNATURE */
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/*
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* SACK option block.
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*/
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struct sackblk {
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tcp_seq left; /* Left edge of sack block. */
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tcp_seq right; /* Right edge of sack block. */
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};
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TAILQ_HEAD(sackhead, sackhole);
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struct sackhole {
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tcp_seq start;
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tcp_seq end;
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tcp_seq rxmit;
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TAILQ_ENTRY(sackhole) sackhole_q;
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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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int t_family; /* address family on the wire */
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struct ipqehead segq; /* sequencing queue */
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int t_segqlen; /* length of the above */
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callout_t 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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/*
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* t_partialacks:
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* <0 not in fast recovery.
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* ==0 in fast recovery. has not received partial acks
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* >0 in fast recovery. has received partial acks
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*/
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short t_partialacks; /* partials acks during fast rexmit */
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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_REASSEMBLING 0x1000 /* we're busy reassembling */
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#define TF_DEAD 0x2000 /* dead and to-be-released */
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#define TF_PMTUD_PEND 0x4000 /* Path MTU Discovery pending */
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#define TF_ECN_PERMIT 0x10000 /* other side said is ECN-ready */
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#define TF_ECN_SND_CWR 0x20000 /* ECN CWR in queue */
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#define TF_ECN_SND_ECE 0x40000 /* ECN ECE in queue */
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#define TF_SIGNATURE 0x400000 /* require MD5 digests (RFC2385) */
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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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callout_t 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 RFC793, 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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/*
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* snd_recover
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* it's basically same as the "recover" variable in RFC 2852 (NewReno).
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* when entering fast retransmit, it's set to snd_max.
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* newreno uses this to detect partial ack.
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* snd_high
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* it's basically same as the "send_high" variable in RFC 2852 (NewReno).
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* on each RTO, it's set to snd_max.
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* newreno uses this to avoid false fast retransmits.
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*/
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tcp_seq snd_recover;
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tcp_seq snd_high;
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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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/*
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* retransmit variables
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*
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* snd_max
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* the highest sequence number we've ever sent.
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* used to recognize retransmits.
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*/
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tcp_seq snd_max;
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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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/* auto-sizing variables */
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u_int rfbuf_cnt; /* recv buffer autoscaling byte count */
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uint32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
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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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/* RFC 3465 variables */
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u_long t_bytes_acked; /* ABC "bytes_acked" parameter */
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/* SACK stuff */
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#define TCP_SACK_MAX 3
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#define TCPSACK_NONE 0
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#define TCPSACK_HAVED 1
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u_char rcv_sack_flags; /* SACK flags. */
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struct sackblk rcv_dsack_block; /* RX D-SACK block. */
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struct ipqehead timeq; /* time sequenced queue. */
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struct sackhead snd_holes; /* TX SACK holes. */
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int snd_numholes; /* Number of TX SACK holes. */
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tcp_seq rcv_lastsack; /* last seq number(+1) sack'd by rcv'r*/
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tcp_seq sack_newdata; /* New data xmitted in this recovery
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episode starts at this seq number*/
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tcp_seq snd_fack; /* FACK TCP. Forward-most data held by
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peer. */
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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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/* prediction of next mbuf when using large window sizes */
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struct mbuf *t_lastm; /* last mbuf that data was sent from */
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int t_inoff; /* data offset in previous mbuf */
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int t_lastoff; /* last data address in mbuf chain */
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int t_lastlen; /* last length read from mbuf chain */
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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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/* Path-MTU Discovery Information */
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u_int t_pmtud_mss_acked; /* MSS acked, lower bound for MTU */
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u_int t_pmtud_mtu_sent; /* MTU used, upper bound for MTU */
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tcp_seq t_pmtud_th_seq; /* TCP SEQ from ICMP payload */
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u_int t_pmtud_nextmtu; /* Advertised Next-Hop MTU from ICMP */
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u_short t_pmtud_ip_len; /* IP length from ICMP payload */
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u_short t_pmtud_ip_hl; /* IP header length from ICMP payload */
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uint8_t t_ecn_retries; /* # of ECN setup retries */
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const struct tcp_congctl *t_congctl; /* per TCB congctl algorithm */
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/* Keepalive per socket */
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u_int t_keepinit;
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u_int t_keepidle;
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u_int t_keepintvl;
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u_int t_keepcnt;
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u_int t_maxidle; /* t_keepcnt * t_keepintvl */
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u_int t_msl; /* MSL to use for this connexion */
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};
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/*
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* Macros to aid ECN TCP.
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*/
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#define TCP_ECN_ALLOWED(tp) (tp->t_flags & TF_ECN_PERMIT)
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/*
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* Macros to aid SACK/FACK TCP.
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*/
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#define TCP_SACK_ENABLED(tp) (tp->t_flags & TF_WILL_SACK)
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#define TCP_FACK_FASTRECOV(tp) \
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(TCP_SACK_ENABLED(tp) && \
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(SEQ_GT(tp->snd_fack, tp->snd_una + tcprexmtthresh * tp->t_segsz)))
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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 (struct tcpcb *)
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__unused;
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static __inline void tcp_reass_unlock (struct tcpcb *)
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__unused;
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static __inline int
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tcp_reass_lock_try(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(struct tcpcb *tp)
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{
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int s;
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s = splvm();
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KASSERT((tp->t_flags & TF_REASSEMBLING) != 0);
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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) { \
|
|
(tp)->t_flags |= TF_DELACK; \
|
|
TCP_RESTART_DELACK(tp); \
|
|
} \
|
|
} while (/*CONSTCOND*/0)
|
|
|
|
#define TCP_CLEAR_DELACK(tp) \
|
|
do { \
|
|
if ((tp)->t_flags & TF_DELACK) { \
|
|
(tp)->t_flags &= ~TF_DELACK; \
|
|
callout_stop(&(tp)->t_delack_ch); \
|
|
} \
|
|
} while (/*CONSTCOND*/0)
|
|
#endif /* _KERNEL */
|
|
|
|
/*
|
|
* Compute the current timestamp for a connection.
|
|
*/
|
|
#define TCP_TIMESTAMP(tp) (tcp_now - (tp)->ts_timebase)
|
|
|
|
/*
|
|
* Handy way of passing around TCP option info.
|
|
*/
|
|
struct tcp_opt_info {
|
|
int ts_present;
|
|
u_int32_t ts_val;
|
|
u_int32_t ts_ecr;
|
|
u_int16_t maxseg;
|
|
};
|
|
|
|
#define TOF_SIGNATURE 0x0040 /* signature option present */
|
|
#define TOF_SIGLEN 0x0080 /* sigature length valid (RFC2385) */
|
|
|
|
/*
|
|
* Data for the TCP compressed state engine.
|
|
*/
|
|
union syn_cache_sa {
|
|
struct sockaddr sa;
|
|
struct sockaddr_in sin;
|
|
#if 1 /*def INET6*/
|
|
struct sockaddr_in6 sin6;
|
|
#endif
|
|
};
|
|
|
|
struct syn_cache {
|
|
TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */
|
|
callout_t sc_timer; /* rexmt timer */
|
|
struct route sc_route;
|
|
long sc_win; /* advertised window */
|
|
int sc_bucketidx; /* our bucket index */
|
|
u_int32_t sc_hash;
|
|
u_int32_t sc_timestamp; /* timestamp from SYN */
|
|
u_int32_t sc_timebase; /* our local timebase */
|
|
union syn_cache_sa sc_src;
|
|
union syn_cache_sa sc_dst;
|
|
tcp_seq sc_irs;
|
|
tcp_seq sc_iss;
|
|
u_int sc_rxtcur; /* current rxt timeout */
|
|
u_int sc_rxttot; /* total time spend on queues */
|
|
u_short sc_rxtshift; /* for computing backoff */
|
|
u_short sc_flags;
|
|
|
|
#define SCF_UNREACH 0x0001 /* we've had an unreach error */
|
|
#define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */
|
|
#define SCF_DEAD 0x0004 /* this entry to be released */
|
|
#define SCF_SACK_PERMIT 0x0008 /* peer will do SACK */
|
|
#define SCF_ECN_PERMIT 0x0010 /* peer will do ECN */
|
|
#define SCF_SIGNATURE 0x40 /* send MD5 digests */
|
|
|
|
struct mbuf *sc_ipopts; /* IP options */
|
|
u_int16_t sc_peermaxseg;
|
|
u_int16_t sc_ourmaxseg;
|
|
u_int8_t sc_request_r_scale : 4,
|
|
sc_requested_s_scale : 4;
|
|
|
|
struct tcpcb *sc_tp; /* tcb for listening socket */
|
|
LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */
|
|
};
|
|
|
|
struct syn_cache_head {
|
|
TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */
|
|
u_short sch_length; /* # entries in bucket */
|
|
};
|
|
|
|
#define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
|
|
#ifdef INET6
|
|
#define in6totcpcb(ip) ((struct tcpcb *)(ip)->in6p_ppcb)
|
|
#endif
|
|
#ifndef INET6
|
|
#define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
|
|
#else
|
|
#define sototcpcb(so) (((so)->so_proto->pr_domain->dom_family == AF_INET) \
|
|
? intotcpcb(sotoinpcb(so)) \
|
|
: in6totcpcb(sotoin6pcb(so)))
|
|
#endif
|
|
|
|
/*
|
|
* See RFC2988 for a discussion of RTO calculation; comments assume
|
|
* familiarity with that document.
|
|
*
|
|
* The smoothed round-trip time and estimated variance are stored as
|
|
* fixed point numbers. Historically, srtt was scaled by
|
|
* TCP_RTT_SHIFT bits, and rttvar by TCP_RTTVAR_SHIFT bits. Because
|
|
* the values coincide with the alpha and beta parameters suggested
|
|
* for RTO calculation (1/8 for srtt, 1/4 for rttvar), the combination
|
|
* of computing 1/8 of the new value and transforming it to the
|
|
* fixed-point representation required zero instructions. However,
|
|
* the storage representations no longer coincide with the alpha/beta
|
|
* shifts; instead, more fractional bits are present.
|
|
*
|
|
* The storage representation of srtt is 1/32 slow ticks, or 1/64 s.
|
|
* (The assumption that a slow tick is 500 ms should not be present in
|
|
* the code.)
|
|
*
|
|
* The storage representation of rttvar is 1/16 slow ticks, or 1/32 s.
|
|
* There may be some confusion about this in the code.
|
|
*
|
|
* For historical reasons, these scales are also used in smoothing the
|
|
* average (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
|
|
* This results in alpha of 0.125 and beta of 0.25, following RFC2988
|
|
* section 2.3
|
|
*
|
|
* XXX Change SHIFT values to LGWEIGHT and REP_SHIFT, and adjust
|
|
* the code to use the correct ones.
|
|
*/
|
|
#define TCP_RTT_SHIFT 3 /* shift for srtt; 3 bits frac. */
|
|
#define TCP_RTTVAR_SHIFT 2 /* multiplier for rttvar; 2 bits */
|
|
|
|
/*
|
|
* Compute TCP retransmission timer, following RFC2988.
|
|
* This macro returns a value in slow timeout ticks.
|
|
*
|
|
* Section 2.2 requires that the RTO value be
|
|
* srtt + max(G, 4*RTTVAR)
|
|
* where G is the clock granularity.
|
|
*
|
|
* This comment has not necessarily been updated for the new storage
|
|
* representation:
|
|
*
|
|
* Because of the way we do the smoothing, srtt and rttvar
|
|
* will each average +1/2 tick of bias. When we compute
|
|
* the retransmit timer, we want 1/2 tick of rounding and
|
|
* 1 extra tick because of +-1/2 tick uncertainty in the
|
|
* 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.
|
|
*
|
|
* This macro appears to be wrong; it should be checking rttvar*4 in
|
|
* ticks and making sure we use 1 instead if rttvar*4 rounds to 0. It
|
|
* appears to be treating srtt as being in the old storage
|
|
* representation, resulting in a factor of 4 extra.
|
|
*/
|
|
#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.
|
|
* Each counter is an unsigned 64-bit value.
|
|
*
|
|
* Many of these should be kept per connection, but that's inconvenient
|
|
* at the moment.
|
|
*/
|
|
#define TCP_STAT_CONNATTEMPT 0 /* connections initiated */
|
|
#define TCP_STAT_ACCEPTS 1 /* connections accepted */
|
|
#define TCP_STAT_CONNECTS 2 /* connections established */
|
|
#define TCP_STAT_DROPS 3 /* connections dropped */
|
|
#define TCP_STAT_CONNDROPS 4 /* embryonic connections dropped */
|
|
#define TCP_STAT_CLOSED 5 /* conn. closed (includes drops) */
|
|
#define TCP_STAT_SEGSTIMED 6 /* segs where we tried to get rtt */
|
|
#define TCP_STAT_RTTUPDATED 7 /* times we succeeded */
|
|
#define TCP_STAT_DELACK 8 /* delayed ACKs sent */
|
|
#define TCP_STAT_TIMEOUTDROP 9 /* conn. dropped in rxmt timeout */
|
|
#define TCP_STAT_REXMTTIMEO 10 /* retransmit timeouts */
|
|
#define TCP_STAT_PERSISTTIMEO 11 /* persist timeouts */
|
|
#define TCP_STAT_KEEPTIMEO 12 /* keepalive timeouts */
|
|
#define TCP_STAT_KEEPPROBE 13 /* keepalive probes sent */
|
|
#define TCP_STAT_KEEPDROPS 14 /* connections dropped in keepalive */
|
|
#define TCP_STAT_PERSISTDROPS 15 /* connections dropped in persist */
|
|
#define TCP_STAT_CONNSDRAINED 16 /* connections drained due to memory
|
|
shortage */
|
|
#define TCP_STAT_PMTUBLACKHOLE 17 /* PMTUD blackhole detected */
|
|
#define TCP_STAT_SNDTOTAL 18 /* total packets sent */
|
|
#define TCP_STAT_SNDPACK 19 /* data packlets sent */
|
|
#define TCP_STAT_SNDBYTE 20 /* data bytes sent */
|
|
#define TCP_STAT_SNDREXMITPACK 21 /* data packets retransmitted */
|
|
#define TCP_STAT_SNDREXMITBYTE 22 /* data bytes retransmitted */
|
|
#define TCP_STAT_SNDACKS 23 /* ACK-only packets sent */
|
|
#define TCP_STAT_SNDPROBE 24 /* window probes sent */
|
|
#define TCP_STAT_SNDURG 25 /* packets sent with URG only */
|
|
#define TCP_STAT_SNDWINUP 26 /* window update-only packets sent */
|
|
#define TCP_STAT_SNDCTRL 27 /* control (SYN|FIN|RST) packets sent */
|
|
#define TCP_STAT_RCVTOTAL 28 /* total packets received */
|
|
#define TCP_STAT_RCVPACK 29 /* packets received in sequence */
|
|
#define TCP_STAT_RCVBYTE 30 /* bytes received in sequence */
|
|
#define TCP_STAT_RCVBADSUM 31 /* packets received with cksum errs */
|
|
#define TCP_STAT_RCVBADOFF 32 /* packets received with bad offset */
|
|
#define TCP_STAT_RCVMEMDROP 33 /* packets dropped for lack of memory */
|
|
#define TCP_STAT_RCVSHORT 34 /* packets received too short */
|
|
#define TCP_STAT_RCVDUPPACK 35 /* duplicate-only packets received */
|
|
#define TCP_STAT_RCVDUPBYTE 36 /* duplicate-only bytes received */
|
|
#define TCP_STAT_RCVPARTDUPPACK 37 /* packets with some duplicate data */
|
|
#define TCP_STAT_RCVPARTDUPBYTE 38 /* dup. bytes in part-dup. packets */
|
|
#define TCP_STAT_RCVOOPACK 39 /* out-of-order packets received */
|
|
#define TCP_STAT_RCVOOBYTE 40 /* out-of-order bytes received */
|
|
#define TCP_STAT_RCVPACKAFTERWIN 41 /* packets with data after window */
|
|
#define TCP_STAT_RCVBYTEAFTERWIN 42 /* bytes received after window */
|
|
#define TCP_STAT_RCVAFTERCLOSE 43 /* packets received after "close" */
|
|
#define TCP_STAT_RCVWINPROBE 44 /* rcvd window probe packets */
|
|
#define TCP_STAT_RCVDUPACK 45 /* rcvd duplicate ACKs */
|
|
#define TCP_STAT_RCVACKTOOMUCH 46 /* rcvd ACKs for unsent data */
|
|
#define TCP_STAT_RCVACKPACK 47 /* rcvd ACK packets */
|
|
#define TCP_STAT_RCVACKBYTE 48 /* bytes ACKed by rcvd ACKs */
|
|
#define TCP_STAT_RCVWINUPD 49 /* rcvd window update packets */
|
|
#define TCP_STAT_PAWSDROP 50 /* segments dropped due to PAWS */
|
|
#define TCP_STAT_PREDACK 51 /* times hdr predict OK for ACKs */
|
|
#define TCP_STAT_PREDDAT 52 /* times hdr predict OK for data pkts */
|
|
#define TCP_STAT_PCBHASHMISS 53 /* input packets missing PCB hash */
|
|
#define TCP_STAT_NOPORT 54 /* no socket on port */
|
|
#define TCP_STAT_BADSYN 55 /* received ACK for which we have
|
|
no SYN in compressed state */
|
|
#define TCP_STAT_DELAYED_FREE 56 /* delayed pool_put() of tcpcb */
|
|
#define TCP_STAT_SC_ADDED 57 /* # of sc entries added */
|
|
#define TCP_STAT_SC_COMPLETED 58 /* # of sc connections completed */
|
|
#define TCP_STAT_SC_TIMED_OUT 59 /* # of sc entries timed out */
|
|
#define TCP_STAT_SC_OVERFLOWED 60 /* # of sc drops due to overflow */
|
|
#define TCP_STAT_SC_RESET 61 /* # of sc drops due to RST */
|
|
#define TCP_STAT_SC_UNREACH 62 /* # of sc drops due to ICMP unreach */
|
|
#define TCP_STAT_SC_BUCKETOVERFLOW 63 /* # of sc drops due to bucket ovflow */
|
|
#define TCP_STAT_SC_ABORTED 64 /* # of sc entries aborted (no mem) */
|
|
#define TCP_STAT_SC_DUPESYN 65 /* # of duplicate SYNs received */
|
|
#define TCP_STAT_SC_DROPPED 66 /* # of SYNs dropped (no route/mem) */
|
|
#define TCP_STAT_SC_COLLISIONS 67 /* # of sc hash collisions */
|
|
#define TCP_STAT_SC_RETRANSMITTED 68 /* # of sc retransmissions */
|
|
#define TCP_STAT_SC_DELAYED_FREE 69 /* # of delayed pool_put()s */
|
|
#define TCP_STAT_SELFQUENCH 70 /* # of ENOBUFS we get on output */
|
|
#define TCP_STAT_BADSIG 71 /* # of drops due to bad signature */
|
|
#define TCP_STAT_GOODSIG 72 /* # of packets with good signature */
|
|
#define TCP_STAT_ECN_SHS 73 /* # of successful ECN handshakes */
|
|
#define TCP_STAT_ECN_CE 74 /* # of packets with CE bit */
|
|
#define TCP_STAT_ECN_ECT 75 /* # of packets with ECT(0) bit */
|
|
|
|
#define TCP_NSTATS 76
|
|
|
|
/*
|
|
* 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_INIT_WIN_LOCAL 26 /* initial window for local nets */
|
|
#define TCPCTL_IDENT 27 /* rfc 931 identd */
|
|
#define TCPCTL_ACKDROPRATELIMIT 28 /* SYN/RST -> ACK rate limit */
|
|
#define TCPCTL_LOOPBACKCKSUM 29 /* do TCP checksum on loopback */
|
|
#define TCPCTL_STATS 30 /* TCP statistics */
|
|
#define TCPCTL_DEBUG 31 /* TCP debug sockets */
|
|
#define TCPCTL_DEBX 32 /* # of tcp debug sockets */
|
|
#define TCPCTL_DROP 33 /* drop tcp connection */
|
|
#define TCPCTL_MSL 34 /* Max Segment Life */
|
|
#define TCPCTL_MAXID 35
|
|
|
|
#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 }, \
|
|
{ 0, 0 }, \
|
|
{ "log_refused",CTLTYPE_INT }, \
|
|
{ 0, 0 }, \
|
|
{ "rstppslimit", CTLTYPE_INT }, \
|
|
{ "delack_ticks", CTLTYPE_INT }, \
|
|
{ "init_win_local", CTLTYPE_INT }, \
|
|
{ "ident", CTLTYPE_STRUCT }, \
|
|
{ "ackdropppslimit", CTLTYPE_INT }, \
|
|
{ "do_loopback_cksum", CTLTYPE_INT }, \
|
|
{ "stats", CTLTYPE_STRUCT }, \
|
|
{ "debug", CTLTYPE_STRUCT }, \
|
|
{ "debx", CTLTYPE_INT }, \
|
|
{ "drop", CTLTYPE_STRUCT }, \
|
|
{ "msl", CTLTYPE_INT }, \
|
|
}
|
|
|
|
#ifdef _KERNEL
|
|
extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */
|
|
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_mssdflt; /* default seg size */
|
|
extern int tcp_minmss; /* minimal seg size */
|
|
extern int tcp_msl; /* max segment life */
|
|
extern int tcp_init_win; /* initial window */
|
|
extern int tcp_init_win_local; /* initial window for local nets */
|
|
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_do_ecn; /* TCP ECN enabled/disabled? */
|
|
extern int tcp_ecn_maxretries; /* Max ECN setup retries */
|
|
#if NRND > 0
|
|
extern int tcp_do_rfc1948; /* ISS by cryptographic hash */
|
|
#endif
|
|
extern int tcp_sack_tp_maxholes; /* Max holes per connection. */
|
|
extern int tcp_sack_globalmaxholes; /* Max holes per system. */
|
|
extern int tcp_sack_globalholes; /* Number of holes present. */
|
|
extern int tcp_do_abc; /* RFC3465 ABC enabled/disabled? */
|
|
extern int tcp_abc_aggressive; /* 1: L=2*SMSS 0: L=1*SMSS */
|
|
|
|
extern int tcp_msl_enable; /* enable TIME_WAIT truncation */
|
|
extern int tcp_msl_loop; /* MSL for loopback */
|
|
extern int tcp_msl_local; /* MSL for 'local' */
|
|
extern int tcp_msl_remote; /* MSL otherwise */
|
|
extern int tcp_msl_remote_threshold; /* RTT threshold */
|
|
extern int tcp_rttlocal; /* Use RTT to decide who's 'local' */
|
|
extern int tcp4_vtw_enable;
|
|
extern int tcp6_vtw_enable;
|
|
extern int tcp_vtw_was_enabled;
|
|
extern int tcp_vtw_entries;
|
|
|
|
extern int tcp_rst_ppslim;
|
|
extern int tcp_ackdrop_ppslim;
|
|
|
|
extern int tcp_syn_cache_size;
|
|
extern struct syn_cache_head tcp_syn_cache[];
|
|
extern u_long syn_cache_count;
|
|
|
|
#ifdef MBUFTRACE
|
|
extern struct mowner tcp_rx_mowner;
|
|
extern struct mowner tcp_tx_mowner;
|
|
extern struct mowner tcp_reass_mowner;
|
|
extern struct mowner tcp_sock_mowner;
|
|
extern struct mowner tcp_sock_rx_mowner;
|
|
extern struct mowner tcp_sock_tx_mowner;
|
|
extern struct mowner tcp_mowner;
|
|
#endif
|
|
|
|
extern int tcp_do_autorcvbuf;
|
|
extern int tcp_autorcvbuf_inc;
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extern int tcp_autorcvbuf_max;
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extern int tcp_do_autosndbuf;
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extern int tcp_autosndbuf_inc;
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extern int tcp_autosndbuf_max;
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#define TCPCTL_VARIABLES { \
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{ 0 }, \
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{ 1, 0, &tcp_do_rfc1323 }, \
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{ 1, 0, &tcp_sendspace }, \
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{ 1, 0, &tcp_recvspace }, \
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{ 1, 0, &tcp_mssdflt }, \
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{ 1, 0, &tcp_syn_cache_limit }, \
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{ 1, 0, &tcp_syn_bucket_limit }, \
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{ 0 }, \
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{ 1, 0, &tcp_init_win }, \
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{ 1, 0, &tcp_mss_ifmtu }, \
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{ 1, 0, &tcp_do_sack }, \
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{ 1, 0, &tcp_do_win_scale }, \
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{ 1, 0, &tcp_do_timestamps }, \
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{ 1, 0, &tcp_compat_42 }, \
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{ 1, 0, &tcp_cwm }, \
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{ 1, 0, &tcp_cwm_burstsize }, \
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{ 1, 0, &tcp_ack_on_push }, \
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{ 1, 0, &tcp_keepidle }, \
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{ 1, 0, &tcp_keepintvl }, \
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{ 1, 0, &tcp_keepcnt }, \
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{ 1, 1, 0, PR_SLOWHZ }, \
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{ 0 }, \
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{ 1, 0, &tcp_log_refused }, \
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{ 0 }, \
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{ 1, 0, &tcp_rst_ppslim }, \
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{ 1, 0, &tcp_delack_ticks }, \
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{ 1, 0, &tcp_init_win_local }, \
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{ 1, 0, &tcp_ackdrop_ppslim }, \
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}
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struct secasvar;
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int tcp_attach(struct socket *);
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void tcp_canceltimers(struct tcpcb *);
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struct tcpcb *
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tcp_close(struct tcpcb *);
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int tcp_isdead(struct tcpcb *);
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#ifdef INET6
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void *tcp6_ctlinput(int, const struct sockaddr *, void *);
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#endif
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void *tcp_ctlinput(int, const struct sockaddr *, void *);
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int tcp_ctloutput(int, struct socket *, struct sockopt *);
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struct tcpcb *
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tcp_disconnect(struct tcpcb *);
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struct tcpcb *
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tcp_drop(struct tcpcb *, int);
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#ifdef TCP_SIGNATURE
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int tcp_signature_apply(void *, void *, u_int);
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struct secasvar *tcp_signature_getsav(struct mbuf *, struct tcphdr *);
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int tcp_signature(struct mbuf *, struct tcphdr *, int, struct secasvar *,
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char *);
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#endif
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void tcp_drain(void);
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void tcp_drainstub(void);
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void tcp_established(struct tcpcb *);
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void tcp_init(void);
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#ifdef INET6
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int tcp6_input(struct mbuf **, int *, int);
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#endif
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void tcp_input(struct mbuf *, ...);
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u_int tcp_hdrsz(struct tcpcb *);
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u_long tcp_mss_to_advertise(const struct ifnet *, int);
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void tcp_mss_from_peer(struct tcpcb *, int);
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void tcp_tcpcb_template(void);
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struct tcpcb *
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tcp_newtcpcb(int, void *);
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void tcp_notify(struct inpcb *, int);
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#ifdef INET6
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void tcp6_notify(struct in6pcb *, int);
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#endif
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u_int tcp_optlen(struct tcpcb *);
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int tcp_output(struct tcpcb *);
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void tcp_pulloutofband(struct socket *,
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struct tcphdr *, struct mbuf *, int);
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void tcp_quench(struct inpcb *, int);
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#ifdef INET6
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void tcp6_quench(struct in6pcb *, int);
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#endif
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void tcp_mtudisc(struct inpcb *, int);
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void tcpipqent_init(void);
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struct ipqent *tcpipqent_alloc(void);
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void tcpipqent_free(struct ipqent *);
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int tcp_respond(struct tcpcb *, struct mbuf *, struct mbuf *,
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struct tcphdr *, tcp_seq, tcp_seq, int);
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void tcp_rmx_rtt(struct tcpcb *);
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void tcp_setpersist(struct tcpcb *);
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#ifdef TCP_SIGNATURE
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int tcp_signature_compute(struct mbuf *, struct tcphdr *, int, int,
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int, u_char *, u_int);
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#endif
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void tcp_slowtimo(void);
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void tcp_fasttimo(void);
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struct mbuf *
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tcp_template(struct tcpcb *);
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void tcp_trace(short, short, struct tcpcb *, struct mbuf *, int);
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struct tcpcb *
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tcp_usrclosed(struct tcpcb *);
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void tcp_usrreq_init(void);
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int tcp_usrreq(struct socket *,
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int, struct mbuf *, struct mbuf *, struct mbuf *, struct lwp *);
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void tcp_xmit_timer(struct tcpcb *, uint32_t);
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tcp_seq tcp_new_iss(struct tcpcb *, tcp_seq);
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tcp_seq tcp_new_iss1(void *, void *, u_int16_t, u_int16_t, size_t,
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tcp_seq);
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void tcp_sack_init(void);
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void tcp_new_dsack(struct tcpcb *, tcp_seq, u_int32_t);
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void tcp_sack_option(struct tcpcb *, const struct tcphdr *,
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const u_char *, int);
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void tcp_del_sackholes(struct tcpcb *, const struct tcphdr *);
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void tcp_free_sackholes(struct tcpcb *);
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void tcp_sack_adjust(struct tcpcb *tp);
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struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
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void tcp_sack_newack(struct tcpcb *, const struct tcphdr *);
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int tcp_sack_numblks(const struct tcpcb *);
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#define TCP_SACK_OPTLEN(nblks) ((nblks) * 8 + 2 + 2)
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void tcp_statinc(u_int);
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void tcp_statadd(u_int, uint64_t);
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int syn_cache_add(struct sockaddr *, struct sockaddr *,
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struct tcphdr *, unsigned int, struct socket *,
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struct mbuf *, u_char *, int, struct tcp_opt_info *);
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void syn_cache_unreach(const struct sockaddr *, const struct sockaddr *,
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struct tcphdr *);
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struct socket *syn_cache_get(struct sockaddr *, struct sockaddr *,
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struct tcphdr *, unsigned int, unsigned int,
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struct socket *so, struct mbuf *);
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void syn_cache_init(void);
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void syn_cache_insert(struct syn_cache *, struct tcpcb *);
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struct syn_cache *syn_cache_lookup(const struct sockaddr *, const struct sockaddr *,
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struct syn_cache_head **);
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void syn_cache_reset(struct sockaddr *, struct sockaddr *,
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struct tcphdr *);
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int syn_cache_respond(struct syn_cache *, struct mbuf *);
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void syn_cache_timer(void *);
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void syn_cache_cleanup(struct tcpcb *);
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int tcp_input_checksum(int, struct mbuf *, const struct tcphdr *, int, int,
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int);
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#endif
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#endif /* !_NETINET_TCP_VAR_H_ */
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