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      1 /*	$NetBSD: pfil.h,v 1.33 2017/01/16 09:28:40 ryo 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 struct ifaddr;
     37 
     38 /*
     39  * The packet filter hooks are designed for anything to call them to
     40  * possibly intercept the packet.
     41  */
     42 typedef int (*pfil_func_t)(void *, struct mbuf **, struct ifnet *, int);
     43 typedef void (*pfil_ifunc_t)(void *, unsigned long, void *);
     44 
     45 #define PFIL_IN		0x00000001
     46 #define PFIL_OUT	0x00000002
     47 #define PFIL_ALL	(PFIL_IN|PFIL_OUT)
     48 #define PFIL_IFADDR	0x00000008
     49 #define PFIL_IFNET	0x00000010
     50 
     51 /* events notified by PFIL_IFNET */
     52 #define	PFIL_IFNET_ATTACH	0
     53 #define	PFIL_IFNET_DETACH	1
     54 
     55 #define	PFIL_TYPE_AF		1	/* key is AF_* type */
     56 #define	PFIL_TYPE_IFNET		2	/* key is ifnet or ifaddr pointer */
     57 
     58 typedef struct pfil_head	pfil_head_t;
     59 
     60 #ifdef _KERNEL
     61 
     62 void	pfil_init(void);
     63 int	pfil_run_hooks(pfil_head_t *, struct mbuf **, struct ifnet *, int);
     64 void	pfil_run_addrhooks(pfil_head_t *, unsigned long, struct ifaddr *);
     65 void	pfil_run_ifhooks(pfil_head_t *, unsigned long, struct ifnet *);
     66 
     67 int	pfil_add_hook(pfil_func_t, void *, int, pfil_head_t *);
     68 int	pfil_remove_hook(pfil_func_t, void *, int, pfil_head_t *);
     69 
     70 int	pfil_add_ihook(pfil_ifunc_t, void *, int, pfil_head_t *);
     71 int	pfil_remove_ihook(pfil_ifunc_t, void *, int, pfil_head_t *);
     72 
     73 pfil_head_t *	pfil_head_create(int, void *);
     74 void		pfil_head_destroy(pfil_head_t *);
     75 pfil_head_t *	pfil_head_get(int, void *);
     76 
     77 /* Packet filtering hook for interfaces (in sys/net/if.c module). */
     78 extern pfil_head_t *if_pfil;
     79 
     80 #endif /* _KERNEL */
     81 
     82 #endif /* !_NET_PFIL_H_ */
     83