2 /* $NetBSD: pfil.h,v 1.22 2003/06/23 12:57:08 martin 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/systm.h>
36 #include <sys/queue.h>
37 #include <sys/_lock.h>
38 #include <sys/_mutex.h>
40 #include <sys/rmlock.h>
47 * The packet filter hooks are designed for anything to call them to
48 * possibly intercept the packet.
50 struct packet_filter_hook {
51 TAILQ_ENTRY(packet_filter_hook) pfil_link;
52 int (*pfil_func)(void *, struct mbuf **, struct ifnet *, int,
57 #define PFIL_IN 0x00000001
58 #define PFIL_OUT 0x00000002
59 #define PFIL_WAITOK 0x00000004
60 #define PFIL_ALL (PFIL_IN|PFIL_OUT)
62 typedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;
64 #define PFIL_TYPE_AF 1 /* key is AF_* type */
65 #define PFIL_TYPE_IFNET 2 /* key is ifnet pointer */
67 #define PFIL_FLAG_PRIVATE_LOCK 0x01 /* Personal lock instead of global */
74 #if defined( __linux__ ) || defined( _WIN32 )
77 struct rmlock *ph_plock; /* Pointer to the used lock */
78 struct rmlock ph_lock; /* Private lock storage */
85 #define ph_af ph_un.phu_val
86 #define ph_ifnet ph_un.phu_ptr
87 LIST_ENTRY(pfil_head) ph_list;
90 int pfil_add_hook(int (*func)(void *, struct mbuf **, struct ifnet *,
91 int, struct inpcb *), void *, int, struct pfil_head *);
92 int pfil_remove_hook(int (*func)(void *, struct mbuf **, struct ifnet *,
93 int, struct inpcb *), void *, int, struct pfil_head *);
94 int pfil_run_hooks(struct pfil_head *, struct mbuf **, struct ifnet *,
95 int, struct inpcb *inp);
97 struct rm_priotracker; /* Do not require including rmlock header */
98 int pfil_try_rlock(struct pfil_head *, struct rm_priotracker *);
99 void pfil_rlock(struct pfil_head *, struct rm_priotracker *);
100 void pfil_runlock(struct pfil_head *, struct rm_priotracker *);
101 void pfil_wlock(struct pfil_head *);
102 void pfil_wunlock(struct pfil_head *);
103 int pfil_wowned(struct pfil_head *ph);
105 int pfil_head_register(struct pfil_head *);
106 int pfil_head_unregister(struct pfil_head *);
108 struct pfil_head *pfil_head_get(int, u_long);
110 #define PFIL_HOOKED(p) ((p)->ph_nhooks > 0)
111 #define PFIL_LOCK_INIT_REAL(l, t) \
112 rm_init_flags(l, "PFil " t " rmlock", RM_RECURSE)
113 #define PFIL_LOCK_DESTROY_REAL(l) \
115 #define PFIL_LOCK_INIT(p) do { \
116 if ((p)->flags & PFIL_FLAG_PRIVATE_LOCK) { \
117 PFIL_LOCK_INIT_REAL(&(p)->ph_lock, "private"); \
118 (p)->ph_plock = &(p)->ph_lock; \
120 (p)->ph_plock = &V_pfil_lock; \
122 #define PFIL_LOCK_DESTROY(p) do { \
123 if ((p)->flags & PFIL_FLAG_PRIVATE_LOCK) \
124 PFIL_LOCK_DESTROY_REAL((p)->ph_plock); \
126 #define PFIL_TRY_RLOCK(p, t) rm_try_rlock((p)->ph_plock, (t))
127 #define PFIL_RLOCK(p, t) rm_rlock((p)->ph_plock, (t))
128 #define PFIL_WLOCK(p) rm_wlock((p)->ph_plock)
129 #define PFIL_RUNLOCK(p, t) rm_runlock((p)->ph_plock, (t))
130 #define PFIL_WUNLOCK(p) rm_wunlock((p)->ph_plock)
131 #define PFIL_WOWNED(p) rm_wowned((p)->ph_plock)
132 #define PFIL_LIST_LOCK() mtx_lock(&pfil_global_lock)
133 #define PFIL_LIST_UNLOCK() mtx_unlock(&pfil_global_lock)
135 static __inline struct packet_filter_hook *
136 pfil_hook_get(int dir, struct pfil_head *ph)
140 return (TAILQ_FIRST(&ph->ph_in));
141 else if (dir == PFIL_OUT)
142 return (TAILQ_FIRST(&ph->ph_out));
147 #endif /* _NET_PFIL_H_ */