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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /*
23: * Copyright 1997 Massachusetts Institute of Technology
24: *
25: * Permission to use, copy, modify, and distribute this software and
26: * its documentation for any purpose and without fee is hereby
27: * granted, provided that both the above copyright notice and this
28: * permission notice appear in all copies, that both the above
29: * copyright notice and this permission notice appear in all
30: * supporting documentation, and that the name of M.I.T. not be used
31: * in advertising or publicity pertaining to distribution of the
32: * software without specific, written prior permission. M.I.T. makes
33: * no representations about the suitability of this software for any
34: * purpose. It is provided "as is" without express or implied
35: * warranty.
36: *
37: * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
38: * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
39: * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
40: * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
41: * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48: * SUCH DAMAGE.
49: *
50: */
51:
52: #ifndef _NET_HOSTCACHE_H
53: #define _NET_HOSTCACHE_H 1
54:
55: /*
56: * This file defines the interface between network protocols and
57: * the cache of host-specific information maintained by the kernel.
58: * The generic interface takes care of inserting and deleting entries,
59: * maintaining mutual exclusion, and enforcing policy constraint on the
60: * size of the cache and the maximum age of its entries.
61: * It replaces an earlier scheme which overloaded the routing table
62: * for this purpose, and should be significantly more efficient
63: * at performing most operations. (It does keep a route to each
64: * entry in the cache.) Most protocols will want to define a
65: * structure which begins with `struct hcentry' so that they
66: * can keep additional, protocol-specific information in it.
67: */
68:
69: #include <sys/queue.h>
70:
71: struct hcentry {
72: LIST_ENTRY(hcentry) hc_link;
73: struct timeval hc_idlesince; /* time last ref dropped */
74: struct sockaddr *hc_host; /* address of this entry's host */
75: struct rtentry *hc_rt; /* route to get there */
76: /* struct nexthop *hc_nh; */
77: int hc_refcnt; /* reference count */
78: struct hctable *hc_hct; /* back ref to table */
79: };
80:
81: struct hccallback {
82: u_long (*hccb_hash)(struct sockaddr *, u_long);
83: int (*hccb_delete)(struct hcentry *);
84: u_long (*hccb_bump)(u_long);
85: };
86:
87: LIST_HEAD(hchead, hcentry);
88:
89: struct hctable {
90: u_long hct_nentries;
91: u_long hct_active;
92: u_long hct_idle;
93: struct hchead *hct_heads;
94: struct hccallback *hct_cb;
95: int hct_primes;
96: };
97:
98: #ifdef KERNEL
99:
100: #ifdef MALLOC_DECLARE
101: MALLOC_DECLARE(M_HOSTCACHE);
102: #endif
103: /*
104: * The table-modification functions must be called from user mode, as
105: * they may block waiting for memory and/or locks.
106: */
107: int hc_init(int af, struct hccallback *hccb, int init_nelem, int primes);
108: struct hcentry *hc_get(struct sockaddr *sa);
109: void hc_ref(struct hcentry *hc);
110: void hc_rele(struct hcentry *hc);
111: int hc_insert(struct hcentry *hc);
112: int hc_delete(struct hcentry *hc);
113: #endif /* KERNEL */
114:
115: #endif /* _NET_HOSTCACHE_H */
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