1 /* $NetBSD: pfil.h,v 1.22 2003/06/23 12:57:08 martin Exp $ */
2 /* $DragonFly: src/sys/net/pfil.h,v 1.11 2008/09/20 06:08:13 sephe Exp $ */
3
4 /*
5 * Copyright (c) 1996 Matthew R. Green
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #ifndef _NET_PFIL_H_
33 #define _NET_PFIL_H_
34
35 #ifndef _SYS_TYPES_H_
36 #include <sys/types.h>
37 #endif
38 #ifndef _SYS_PARAM_H_
39 #include <sys/param.h>
40 #endif
41 #ifndef _SYS_QUEUE_H_
42 #include <sys/queue.h>
43 #endif
44
45 struct mbuf;
46 struct ifnet;
47 struct packet_filter_hook;
48
49 typedef int (*pfil_func_t)(void *, struct mbuf **, struct ifnet *, int);
50
51 #define PFIL_IN 0x00000001
52 #define PFIL_OUT 0x00000002
53 #define PFIL_ALL (PFIL_IN|PFIL_OUT)
54
55 typedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;
56
57 #define PFIL_TYPE_AF 1 /* key is AF_* type */
58 #define PFIL_TYPE_IFNET 2 /* key is ifnet pointer */
59
60 struct pfil_head {
61 pfil_list_t *ph_in;
62 pfil_list_t *ph_out;
63 int ph_type;
64 int ph_hashooks; /* 0 if no hooks installed */
65 union {
66 u_long phu_val;
67 void *phu_ptr;
68 } ph_un;
69 #define ph_af ph_un.phu_val
70 #define ph_ifnet ph_un.phu_ptr
71 LIST_ENTRY(pfil_head) ph_list;
72 };
73 typedef struct pfil_head pfil_head_t;
74
75 int pfil_run_hooks(struct pfil_head *, struct mbuf **, struct ifnet *, int);
76
77 int pfil_add_hook(pfil_func_t, void *, int, struct pfil_head *);
78 int pfil_remove_hook(pfil_func_t, void *, int, struct pfil_head *);
79
80 int pfil_head_register(struct pfil_head *);
81 int pfil_head_unregister(struct pfil_head *);
82
83 struct pfil_head *pfil_head_get(int, u_long);
84
85 extern int filters_default_to_accept;
86
87 /*
88 * Used for a quick shortcut around the pfil routines if no hooks have been
89 * installed.
90 */
91 static __inline int
pfil_has_hooks(struct pfil_head * ph)92 pfil_has_hooks(struct pfil_head *ph)
93 {
94 return(ph->ph_hashooks);
95 }
96
97 /* XXX */
98 #if defined(_KERNEL_OPT)
99 #include "ipfilter.h"
100 #endif
101
102 #endif /* _NET_PFIL_H_ */
103