1 /* $NetBSD: pfil.h,v 1.22 2003/06/23 12:57:08 martin Exp $ */
2 /* $DragonFly: src/sys/net/pfil.h,v 1.4 2004/07/14 08:01:16 asmodai Exp $ */
5 * Copyright (c) 1996 Matthew R. Green
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
35 #include <sys/queue.h>
41 * The packet filter hooks are designed for anything to call them to
42 * possibly intercept the packet.
44 struct packet_filter_hook {
45 TAILQ_ENTRY(packet_filter_hook) pfil_link;
46 int (*pfil_func)(void *, struct mbuf **, struct ifnet *, int);
51 #define PFIL_IN 0x00000001
52 #define PFIL_OUT 0x00000002
53 #define PFIL_WAITOK 0x00000004
54 #define PFIL_ALL (PFIL_IN|PFIL_OUT)
56 typedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;
58 #define PFIL_TYPE_AF 1 /* key is AF_* type */
59 #define PFIL_TYPE_IFNET 2 /* key is ifnet pointer */
65 int ph_hashooks; /* 0 if no hooks installed */
70 #define ph_af ph_un.phu_val
71 #define ph_ifnet ph_un.phu_ptr
72 LIST_ENTRY(pfil_head) ph_list;
74 typedef struct pfil_head pfil_head_t;
76 int pfil_run_hooks(struct pfil_head *, struct mbuf **, struct ifnet *, int);
78 int pfil_add_hook(int (*func)(void *, struct mbuf **,
79 struct ifnet *, int), void *, int, struct pfil_head *);
80 int pfil_remove_hook(int (*func)(void *, struct mbuf **,
81 struct ifnet *, int), void *, int, struct pfil_head *);
83 int pfil_head_register(struct pfil_head *);
84 int pfil_head_unregister(struct pfil_head *);
86 struct pfil_head *pfil_head_get(int, u_long);
88 static __inline struct packet_filter_hook *
89 pfil_hook_get(int dir, struct pfil_head *ph)
93 return (TAILQ_FIRST(&ph->ph_in));
94 else if (dir == PFIL_OUT)
95 return (TAILQ_FIRST(&ph->ph_out));
101 * Used for a quick shortcut around the pfil routines if no hooks have been
105 pfil_has_hooks(struct pfil_head *ph)
107 return(ph->ph_hashooks);
111 #if defined(_KERNEL_OPT)
112 #include "ipfilter.h"
115 #endif /* _NET_PFIL_H_ */