/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * Copyright 1997 Massachusetts Institute of Technology * * Permission to use, copy, modify, and distribute this software and * its documentation for any purpose and without fee is hereby * granted, provided that both the above copyright notice and this * permission notice appear in all copies, that both the above * copyright notice and this permission notice appear in all * supporting documentation, and that the name of M.I.T. not be used * in advertising or publicity pertaining to distribution of the * software without specific, written prior permission. M.I.T. makes * no representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied * warranty. * * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT * SHALL M.I.T. 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. * */ #ifndef _NET_HOSTCACHE_H #define _NET_HOSTCACHE_H 1 /* * This file defines the interface between network protocols and * the cache of host-specific information maintained by the kernel. * The generic interface takes care of inserting and deleting entries, * maintaining mutual exclusion, and enforcing policy constraint on the * size of the cache and the maximum age of its entries. * It replaces an earlier scheme which overloaded the routing table * for this purpose, and should be significantly more efficient * at performing most operations. (It does keep a route to each * entry in the cache.) Most protocols will want to define a * structure which begins with `struct hcentry' so that they * can keep additional, protocol-specific information in it. */ #include <sys/queue.h> struct hcentry { LIST_ENTRY(hcentry) hc_link; struct timeval hc_idlesince; /* time last ref dropped */ struct sockaddr *hc_host; /* address of this entry's host */ struct rtentry *hc_rt; /* route to get there */ /* struct nexthop *hc_nh; */ int hc_refcnt; /* reference count */ struct hctable *hc_hct; /* back ref to table */ }; struct hccallback { u_long (*hccb_hash)(struct sockaddr *, u_long); int (*hccb_delete)(struct hcentry *); u_long (*hccb_bump)(u_long); }; LIST_HEAD(hchead, hcentry); struct hctable { u_long hct_nentries; u_long hct_active; u_long hct_idle; struct hchead *hct_heads; struct hccallback *hct_cb; int hct_primes; }; #ifdef KERNEL #ifdef MALLOC_DECLARE MALLOC_DECLARE(M_HOSTCACHE); #endif /* * The table-modification functions must be called from user mode, as * they may block waiting for memory and/or locks. */ int hc_init(int af, struct hccallback *hccb, int init_nelem, int primes); struct hcentry *hc_get(struct sockaddr *sa); void hc_ref(struct hcentry *hc); void hc_rele(struct hcentry *hc); int hc_insert(struct hcentry *hc); int hc_delete(struct hcentry *hc); #endif /* KERNEL */ #endif /* _NET_HOSTCACHE_H */