FreeBSD/Linux Kernel Cross Reference
sys/net/pfil.h
1 /* $NetBSD: pfil.h,v 1.24 2004/07/27 12:22:59 yamt 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 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #ifndef _NET_PFIL_H_
32 #define _NET_PFIL_H_
33
34 #ifdef _KERNEL_OPT
35 #include "opt_pfil_hooks.h"
36 #endif
37
38 #include <sys/queue.h>
39 #include <net/dlt.h>
40 #include <sys/null.h>
41
42 struct mbuf;
43 struct ifnet;
44
45 /*
46 * The packet filter hooks are designed for anything to call them to
47 * possibly intercept the packet.
48 */
49 struct packet_filter_hook {
50 TAILQ_ENTRY(packet_filter_hook) pfil_link;
51 int (*pfil_func)(void *, struct mbuf **, struct ifnet *, int);
52 void *pfil_arg;
53 int pfil_flags;
54 };
55
56 #define PFIL_IN 0x00000001
57 #define PFIL_OUT 0x00000002
58 #define PFIL_ALL (PFIL_IN|PFIL_OUT)
59 #define PFIL_WAITOK 0x00000004
60 #define PFIL_IFADDR 0x00000008
61 #define PFIL_IFNET 0x00000010
62
63 /* events notified by PFIL_IFNET */
64 #define PFIL_IFNET_ATTACH 0
65 #define PFIL_IFNET_DETACH 1
66
67 typedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;
68
69 #define PFIL_TYPE_AF 1 /* key is AF_* type */
70 #define PFIL_TYPE_IFNET 2 /* key is ifnet pointer */
71
72 struct pfil_head {
73 pfil_list_t ph_in;
74 pfil_list_t ph_out;
75 pfil_list_t ph_ifaddr;
76 pfil_list_t ph_ifnetevent; /* XXX naming collision */
77 int ph_type;
78 union {
79 u_long phu_val;
80 void *phu_ptr;
81 } ph_un;
82 #define ph_af ph_un.phu_val
83 #define ph_ifnet ph_un.phu_ptr
84 LIST_ENTRY(pfil_head) ph_list;
85 };
86 typedef struct pfil_head pfil_head_t;
87
88 int pfil_run_hooks(struct pfil_head *, struct mbuf **, struct ifnet *,
89 int);
90
91 int pfil_add_hook(int (*func)(void *, struct mbuf **,
92 struct ifnet *, int), void *, int, struct pfil_head *);
93 int pfil_remove_hook(int (*func)(void *, struct mbuf **,
94 struct ifnet *, int), void *, int, struct pfil_head *);
95
96 int pfil_head_register(struct pfil_head *);
97 int pfil_head_unregister(struct pfil_head *);
98
99 struct pfil_head *pfil_head_get(int, u_long);
100
101 static __inline struct packet_filter_hook *
102 pfil_hook_get(int dir, struct pfil_head *ph)
103 {
104
105 if (dir == PFIL_IN)
106 return (TAILQ_FIRST(&ph->ph_in));
107 else if (dir == PFIL_OUT)
108 return (TAILQ_FIRST(&ph->ph_out));
109 else if (dir == PFIL_IFADDR)
110 return (TAILQ_FIRST(&ph->ph_ifaddr));
111 else if (dir == PFIL_IFNET)
112 return (TAILQ_FIRST(&ph->ph_ifnetevent));
113 else
114 return (NULL);
115 }
116
117 /* XXX */
118 #if defined(_KERNEL_OPT)
119 #include "ipfilter.h"
120 #endif
121
122 #if NIPFILTER > 0
123 #ifdef PFIL_HOOKS
124 #undef PFIL_HOOKS
125 #endif
126 #define PFIL_HOOKS
127 #endif /* NIPFILTER */
128
129 #ifdef _KERNEL
130 /* in sys/net/if.c */
131 extern struct pfil_head if_pfil; /* packet filtering hook for interfaces */
132 #endif
133
134 #endif /* _NET_PFIL_H_ */
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