1/* $NetBSD: pfil.h,v 1.33 2017/01/16 09:28:40 ryo 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;
36struct ifaddr;
37
38/*
39 * The packet filter hooks are designed for anything to call them to
40 * possibly intercept the packet.
41 */
42typedef int (*pfil_func_t)(void *, struct mbuf **, struct ifnet *, int);
43typedef void (*pfil_ifunc_t)(void *, unsigned long, void *);
44
45#define PFIL_IN 0x00000001
46#define PFIL_OUT 0x00000002
47#define PFIL_ALL (PFIL_IN|PFIL_OUT)
48#define PFIL_IFADDR 0x00000008
49#define PFIL_IFNET 0x00000010
50
51/* events notified by PFIL_IFNET */
52#define PFIL_IFNET_ATTACH 0
53#define PFIL_IFNET_DETACH 1
54
55#define PFIL_TYPE_AF 1 /* key is AF_* type */
56#define PFIL_TYPE_IFNET 2 /* key is ifnet or ifaddr pointer */
57
58typedef struct pfil_head pfil_head_t;
59
60#ifdef _KERNEL
61
62void pfil_init(void);
63int pfil_run_hooks(pfil_head_t *, struct mbuf **, struct ifnet *, int);
64void pfil_run_addrhooks(pfil_head_t *, unsigned long, struct ifaddr *);
65void pfil_run_ifhooks(pfil_head_t *, unsigned long, struct ifnet *);
66
67int pfil_add_hook(pfil_func_t, void *, int, pfil_head_t *);
68int pfil_remove_hook(pfil_func_t, void *, int, pfil_head_t *);
69
70int pfil_add_ihook(pfil_ifunc_t, void *, int, pfil_head_t *);
71int pfil_remove_ihook(pfil_ifunc_t, void *, int, pfil_head_t *);
72
73pfil_head_t * pfil_head_create(int, void *);
74void pfil_head_destroy(pfil_head_t *);
75pfil_head_t * pfil_head_get(int, void *);
76
77/* Packet filtering hook for interfaces (in sys/net/if.c module). */
78extern pfil_head_t *if_pfil;
79
80#endif /* _KERNEL */
81
82#endif /* !_NET_PFIL_H_ */
83