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pfil.h revision 1.13.4.1 
      1 /*	$NetBSD: pfil.h,v 1.13.4.1 2001/04/23 21:49:55 he 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 #include <sys/queue.h>
     35 #include <sys/null.h>
     36 
     37 struct mbuf;
     38 struct ifnet;
     39 
     40 /*
     41  * The packet filter hooks are designed for anything to call them to
     42  * possibly intercept the packet.
     43  */
     44 struct packet_filter_hook {
     45         TAILQ_ENTRY(packet_filter_hook) pfil_link;
     46         int	(*pfil_func) __P((void *, int, struct ifnet *, int,
     47 				  struct mbuf **));
     48 	int	pfil_flags;
     49 };
     50 
     51 #define PFIL_IN		0x00000001
     52 #define PFIL_OUT	0x00000002
     53 #define PFIL_WAITOK	0x00000004
     54 #define PFIL_ALL	(PFIL_IN|PFIL_OUT)
     55 
     56 typedef	TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;
     57 
     58 struct pfil_head {
     59 	pfil_list_t	ph_in;
     60 	pfil_list_t	ph_out;
     61 	int		ph_init;
     62 };
     63 typedef struct pfil_head pfil_head_t;
     64 
     65 struct packet_filter_hook *pfil_hook_get __P((int, struct pfil_head *));
     66 int	pfil_add_hook __P((int (*func) __P((void *, int,
     67 	    struct ifnet *, int, struct mbuf **)), int, struct pfil_head *));
     68 int	pfil_remove_hook __P((int (*func) __P((void *, int,
     69 	    struct ifnet *, int, struct mbuf **)), int, struct pfil_head *));
     70 
     71 /* XXX */
     72 #if defined(_KERNEL) && !defined(_LKM)
     73 #include "ipfilter.h"
     74 #endif
     75 
     76 #if NIPFILTER > 0
     77 #ifdef PFIL_HOOKS
     78 #undef PFIL_HOOKS
     79 #endif
     80 #define PFIL_HOOKS
     81 #endif /* NIPFILTER */
     82 
     83 #endif /* _NET_PFIL_H_ */
     84