221 lines
9.6 KiB
C
221 lines
9.6 KiB
C
/* $NetBSD: tcp_syncache.h,v 1.2 2022/09/20 10:12:18 ozaki-r 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_SYNCACHE_H_
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#define _NETINET_TCP_SYNCACHE_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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#endif
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#ifdef _KERNEL
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#include <sys/callout.h>
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#include <sys/mbuf.h>
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#include <sys/queue.h>
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#include <net/route.h>
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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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callout_t sc_timer; /* rexmt timer */
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struct route sc_route;
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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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#define SCF_DEAD 0x0004 /* this entry to be released */
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#define SCF_SACK_PERMIT 0x0008 /* peer will do SACK */
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#define SCF_ECN_PERMIT 0x0010 /* peer will do ECN */
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#define SCF_SIGNATURE 0x40 /* send MD5 digests */
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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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extern int tcp_syn_bucket_limit;/* max entries per hash bucket */
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extern int tcp_syn_cache_limit; /* max entries for compressed state engine */
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extern u_long syn_cache_count;
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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
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*syn_cache_get(struct sockaddr *, struct sockaddr *,
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struct tcphdr *, 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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void syn_cache_reset(struct sockaddr *, struct sockaddr *,
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struct tcphdr *);
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void syn_cache_cleanup(struct tcpcb *);
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#endif
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#endif /* !_NETINET_TCP_SYNCACHE_H_ */
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