1/* $NetBSD: pfil.h,v 1.31 2013/06/29 21:06:58 rmind Exp $ */
2
3/*
4 * Copyright (c) 1996 Matthew R. Green
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef _NET_PFIL_H_
30#define _NET_PFIL_H_
31
32#include <sys/queue.h>
33
34struct mbuf;
35struct ifnet;
36
37/*
38 * The packet filter hooks are designed for anything to call them to
39 * possibly intercept the packet.
40 */
41typedef int (*pfil_func_t)(void *, struct mbuf **, struct ifnet *, int);
42
43#define PFIL_IN 0x00000001
44#define PFIL_OUT 0x00000002
45#define PFIL_ALL (PFIL_IN|PFIL_OUT)
46#define PFIL_IFADDR 0x00000008
47#define PFIL_IFNET 0x00000010
48
49/* events notified by PFIL_IFNET */
50#define PFIL_IFNET_ATTACH 0
51#define PFIL_IFNET_DETACH 1
52
53#define PFIL_TYPE_AF 1 /* key is AF_* type */
54#define PFIL_TYPE_IFNET 2 /* key is ifnet pointer */
55
56typedef struct pfil_head pfil_head_t;
57
58#ifdef _KERNEL
59
60int pfil_run_hooks(pfil_head_t *, struct mbuf **, struct ifnet *, int);
61int pfil_add_hook(pfil_func_t, void *, int, pfil_head_t *);
62int pfil_remove_hook(pfil_func_t, void *, int, pfil_head_t *);
63
64pfil_head_t * pfil_head_create(int, void *);
65void pfil_head_destroy(pfil_head_t *);
66pfil_head_t * pfil_head_get(int, void *);
67
68/* Packet filtering hook for interfaces (in sys/net/if.c module). */
69extern pfil_head_t *if_pfil;
70
71#endif /* _KERNEL */
72
73#endif /* !_NET_PFIL_H_ */
74