/* $NetBSD: tcp_syncache.h,v 1.2 2022/09/20 10:12:18 ozaki-r Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. 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IN NO EVENT SHALL NRL OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * The views and conclusions contained in the software and documentation * are those of the authors and should not be interpreted as representing * official policies, either expressed or implied, of the US Naval * Research Laboratory (NRL). */ /*- * Copyright (c) 1997, 1998, 1999, 2001, 2005 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center. * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * Copyright (c) 1982, 1986, 1993, 1994, 1995 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95 */ #ifndef _NETINET_TCP_SYNCACHE_H_ #define _NETINET_TCP_SYNCACHE_H_ #if defined(_KERNEL_OPT) #include "opt_inet.h" #include "opt_mbuftrace.h" #endif #ifdef _KERNEL #include <sys/callout.h> #include <sys/mbuf.h> #include <sys/queue.h> #include <net/route.h> /* * 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 */ }; extern int tcp_syn_bucket_limit;/* max entries per hash bucket */ extern int tcp_syn_cache_limit; /* max entries for compressed state engine */ extern u_long syn_cache_count; int syn_cache_add(struct sockaddr *, struct sockaddr *, struct tcphdr *, unsigned int, struct socket *, struct mbuf *, u_char *, int, struct tcp_opt_info *); void syn_cache_unreach(const struct sockaddr *, const struct sockaddr *, struct tcphdr *); struct socket *syn_cache_get(struct sockaddr *, struct sockaddr *, struct tcphdr *, struct socket *so, struct mbuf *); void syn_cache_init(void); void syn_cache_insert(struct syn_cache *, struct tcpcb *); void syn_cache_reset(struct sockaddr *, struct sockaddr *, struct tcphdr *); void syn_cache_cleanup(struct tcpcb *); #endif #endif /* !_NETINET_TCP_SYNCACHE_H_ */
