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pfil.h revision 1.9 
      1 /*	$NetBSD: pfil.h,v 1.9 1998/03/19 15:45:30 mrg 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 /* note: this file needs <net/if.h> and <sys/mbuf.h> */
     35 
     36 #ifdef _KERNEL
     37 #include <sys/queue.h>
     38 
     39 /*
     40  * The packet filter hooks are designed for anything to call them to
     41  * possibly intercept the packet.
     42  */
     43 struct packet_filter_hook {
     44         TAILQ_ENTRY(packet_filter_hook) pfil_link;
     45         int	(*pfil_func) __P((void *, int, struct ifnet *, int,
     46 				  struct mbuf **));
     47 	int	pfil_flags;
     48 };
     49 
     50 #define PFIL_IN		0x00000001
     51 #define PFIL_OUT	0x00000002
     52 #define PFIL_WAITOK	0x00000008
     53 #define PFIL_ALL	(PFIL_IN|PFIL_OUT)
     54 
     55 struct packet_filter_hook *pfil_hook_get __P((int));
     56 void	pfil_add_hook __P((int (*func) __P((void *, int,
     57 	    struct ifnet *, int, struct mbuf **)), int));
     58 void	pfil_remove_hook __P((int (*func) __P((void *, int,
     59 	    struct ifnet *, int, struct mbuf **)), int));
     60 #endif /* _KERNEL */
     61 
     62 /* XXX */
     63 #if defined(_KERNEL) && !defined(_LKM)
     64 #include "ipfilter.h"
     65 #endif
     66 
     67 #if NIPFILTER > 0
     68 #ifdef PFIL_HOOKS
     69 #undef PFIL_HOOKS
     70 #endif
     71 #define PFIL_HOOKS
     72 #endif /* NIPFILTER */
     73 
     74 #endif /* _NET_PFIL_H_ */
     75