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pfil.h revision 1.2 
      1 /*	$NetBSD: pfil.h,v 1.2 1996/10/05 23:41:54 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Matthew R. Green for
     18  *      the NetBSD Project.
     19  * 4. The name of the author may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #ifndef _NET_PFIL_H_
     36 #define _NET_PFIL_H_
     37 
     38 /* note: this file needs <net/if.h> and <sys/mbuf.h> */
     39 
     40 #ifdef _KERNEL
     41 #include <sys/queue.h>
     42 
     43 /*
     44  * The packet filter hooks are designed for anything to call them to
     45  * possibly intercept the packet.
     46  */
     47 struct packet_filter_hook {
     48         LIST_ENTRY(packet_filter_hook) pfil_link;
     49         int	(*pfil_func) __P((void *, int, struct ifnet *, int,
     50 				  struct mbuf **));
     51 	int	pfil_flags;
     52 };
     53 
     54 #define PFIL_IN		0x00000001
     55 #define PFIL_OUT	0x00000002
     56 #define PFIL_BAD	0x00000004
     57 #define PFIL_WAITOK	0x00000008
     58 #define PFIL_ALL	(PFIL_IN|PFIL_OUT|PFIL_BAD)
     59 
     60 struct packet_filter_hook *pfil_hook_get __P((int));
     61 void	pfil_add_hook __P((int (*func) __P((void *, int,
     62 	    struct ifnet *, int, struct mbuf **)), int));
     63 void	pfil_remove_hook __P((int (*func) __P((void *, int,
     64 	    struct ifnet *, int, struct mbuf **)), int));
     65 #endif /* _KERNEL */
     66 
     67 #endif /* _NET_PFIL_H_ */
     68