/*	$FreeBSD: src/sys/net/pfil.h,v 1.9 2002/03/24 09:34:04 bde Exp $	*//* * Copyright (c) 1996 Matthew R. Green * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products *    derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */#ifndef _NET_PFIL_H_#define _NET_PFIL_H_#include <sys/queue.h>struct mbuf;struct ifnet;/* * The packet filter hooks are designed for anything to call them to * possibly intercept the packet. */struct packet_filter_hook {        TAILQ_ENTRY(packet_filter_hook) pfil_link;	int	(*pfil_func)(void *, int, struct ifnet *, int, struct mbuf **);	int	pfil_flags;};#define PFIL_IN		0x00000001#define PFIL_OUT	0x00000002#define PFIL_WAITOK	0x00000004#define PFIL_ALL	(PFIL_IN|PFIL_OUT)typedef	TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;struct pfil_head {	pfil_list_t	ph_in;	pfil_list_t	ph_out;	int		ph_init;};struct packet_filter_hook *pfil_hook_get(int, struct pfil_head *);int	pfil_add_hook(int (*func)(void *, int,	    struct ifnet *, int, struct mbuf **), int, struct pfil_head *);int	pfil_remove_hook(int (*func)(void *, int,	    struct ifnet *, int, struct mbuf **), int, struct pfil_head *);/* XXX */#if defined(_KERNEL) && !defined(KLD_MODULE)#include "opt_ipfilter.h"#endif#if IPFILTER > 0#ifdef PFIL_HOOKS#undef PFIL_HOOKS#endif#define PFIL_HOOKS#endif /* IPFILTER */#endif /* _NET_PFIL_H_ */