FreeBSD/Linux Kernel Cross Reference
sys/net/pfil.h
1 /* $FreeBSD$ */
2 /* $NetBSD: pfil.h,v 1.22 2003/06/23 12:57:08 martin 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 #include <sys/systm.h>
36 #include <sys/queue.h>
37 #include <sys/_lock.h>
38 #include <sys/_mutex.h>
39 #include <sys/lock.h>
40 #include <sys/rmlock.h>
41
42 struct mbuf;
43 struct ifnet;
44 struct inpcb;
45
46 /*
47 * The packet filter hooks are designed for anything to call them to
48 * possibly intercept the packet.
49 */
50 struct packet_filter_hook {
51 TAILQ_ENTRY(packet_filter_hook) pfil_link;
52 int (*pfil_func)(void *, struct mbuf **, struct ifnet *, int,
53 struct inpcb *);
54 void *pfil_arg;
55 };
56
57 #define PFIL_IN 0x00000001
58 #define PFIL_OUT 0x00000002
59 #define PFIL_WAITOK 0x00000004
60 #define PFIL_ALL (PFIL_IN|PFIL_OUT)
61
62 typedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;
63
64 #define PFIL_TYPE_AF 1 /* key is AF_* type */
65 #define PFIL_TYPE_IFNET 2 /* key is ifnet pointer */
66
67 struct pfil_head {
68 pfil_list_t ph_in;
69 pfil_list_t ph_out;
70 int ph_type;
71 int ph_nhooks;
72 struct rmlock ph_lock;
73 union {
74 u_long phu_val;
75 void *phu_ptr;
76 } ph_un;
77 #define ph_af ph_un.phu_val
78 #define ph_ifnet ph_un.phu_ptr
79 LIST_ENTRY(pfil_head) ph_list;
80 };
81
82 int pfil_add_hook(int (*func)(void *, struct mbuf **, struct ifnet *,
83 int, struct inpcb *), void *, int, struct pfil_head *);
84 int pfil_remove_hook(int (*func)(void *, struct mbuf **, struct ifnet *,
85 int, struct inpcb *), void *, int, struct pfil_head *);
86 int pfil_run_hooks(struct pfil_head *, struct mbuf **, struct ifnet *,
87 int, struct inpcb *inp);
88
89 int pfil_head_register(struct pfil_head *);
90 int pfil_head_unregister(struct pfil_head *);
91
92 struct pfil_head *pfil_head_get(int, u_long);
93
94 #define PFIL_HOOKED(p) ((p)->ph_nhooks > 0)
95 #define PFIL_LOCK_INIT(p) \
96 rm_init_flags(&(p)->ph_lock, "PFil hook read/write mutex", RM_RECURSE)
97 #define PFIL_LOCK_DESTROY(p) rm_destroy(&(p)->ph_lock)
98 #define PFIL_RLOCK(p, t) rm_rlock(&(p)->ph_lock, (t))
99 #define PFIL_WLOCK(p) rm_wlock(&(p)->ph_lock)
100 #define PFIL_RUNLOCK(p, t) rm_runlock(&(p)->ph_lock, (t))
101 #define PFIL_WUNLOCK(p) rm_wunlock(&(p)->ph_lock)
102 #define PFIL_LIST_LOCK() mtx_lock(&pfil_global_lock)
103 #define PFIL_LIST_UNLOCK() mtx_unlock(&pfil_global_lock)
104
105 static __inline struct packet_filter_hook *
106 pfil_hook_get(int dir, struct pfil_head *ph)
107 {
108
109 if (dir == PFIL_IN)
110 return (TAILQ_FIRST(&ph->ph_in));
111 else if (dir == PFIL_OUT)
112 return (TAILQ_FIRST(&ph->ph_out));
113 else
114 return (NULL);
115 }
116
117 #endif /* _NET_PFIL_H_ */
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