FreeBSD/Linux Kernel Cross Reference
sys/net/pfil.h
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
34 struct mbuf;
35 struct ifnet;
36 struct ifaddr;
37
38 /*
39 * The packet filter hooks are designed for anything to call them to
40 * possibly intercept the packet.
41 */
42 typedef int (*pfil_func_t)(void *, struct mbuf **, struct ifnet *, int);
43 typedef 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
58 typedef struct pfil_head pfil_head_t;
59
60 #ifdef _KERNEL
61
62 void pfil_init(void);
63 int pfil_run_hooks(pfil_head_t *, struct mbuf **, struct ifnet *, int);
64 void pfil_run_addrhooks(pfil_head_t *, unsigned long, struct ifaddr *);
65 void pfil_run_ifhooks(pfil_head_t *, unsigned long, struct ifnet *);
66
67 int pfil_add_hook(pfil_func_t, void *, int, pfil_head_t *);
68 int pfil_remove_hook(pfil_func_t, void *, int, pfil_head_t *);
69
70 int pfil_add_ihook(pfil_ifunc_t, void *, int, pfil_head_t *);
71 int pfil_remove_ihook(pfil_ifunc_t, void *, int, pfil_head_t *);
72
73 pfil_head_t * pfil_head_create(int, void *);
74 void pfil_head_destroy(pfil_head_t *);
75 pfil_head_t * pfil_head_get(int, void *);
76
77 /* Packet filtering hook for interfaces (in sys/net/if.c module). */
78 extern pfil_head_t *if_pfil;
79
80 #endif /* _KERNEL */
81
82 #endif /* !_NET_PFIL_H_ */
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