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pfil.h revision 1.31 
      1 /*	$NetBSD: pfil.h,v 1.31 2013/06/29 21:06:58 rmind 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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #ifndef _NET_PFIL_H_
     30 #define _NET_PFIL_H_
     31 
     32 #include <sys/queue.h>
     33 
     34 struct mbuf;
     35 struct ifnet;
     36 
     37 /*
     38  * The packet filter hooks are designed for anything to call them to
     39  * possibly intercept the packet.
     40  */
     41 typedef int (*pfil_func_t)(void *, struct mbuf **, struct ifnet *, int);
     42 
     43 #define PFIL_IN		0x00000001
     44 #define PFIL_OUT	0x00000002
     45 #define PFIL_ALL	(PFIL_IN|PFIL_OUT)
     46 #define PFIL_IFADDR	0x00000008
     47 #define PFIL_IFNET	0x00000010
     48 
     49 /* events notified by PFIL_IFNET */
     50 #define	PFIL_IFNET_ATTACH	0
     51 #define	PFIL_IFNET_DETACH	1
     52 
     53 #define	PFIL_TYPE_AF		1	/* key is AF_* type */
     54 #define	PFIL_TYPE_IFNET		2	/* key is ifnet pointer */
     55 
     56 typedef struct pfil_head	pfil_head_t;
     57 
     58 #ifdef _KERNEL
     59 
     60 int	pfil_run_hooks(pfil_head_t *, struct mbuf **, struct ifnet *, int);
     61 int	pfil_add_hook(pfil_func_t, void *, int, pfil_head_t *);
     62 int	pfil_remove_hook(pfil_func_t, void *, int, pfil_head_t *);
     63 
     64 pfil_head_t *	pfil_head_create(int, void *);
     65 void		pfil_head_destroy(pfil_head_t *);
     66 pfil_head_t *	pfil_head_get(int, void *);
     67 
     68 /* Packet filtering hook for interfaces (in sys/net/if.c module). */
     69 extern pfil_head_t *if_pfil;
     70 
     71 #endif /* _KERNEL */
     72 
     73 #endif /* !_NET_PFIL_H_ */
     74