45159fa631
change pfil_add_hook to put output filters at the tail of the queue, while continuing to place input filters at the head of the queue. update the two users of these functions, and document these changes. fixes PR#4593.
75 lines
2.5 KiB
C
75 lines
2.5 KiB
C
/* $NetBSD: pfil.h,v 1.9 1998/03/19 15:45:30 mrg Exp $ */
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/*
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* Copyright (c) 1996 Matthew R. Green
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _NET_PFIL_H_
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#define _NET_PFIL_H_
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/* note: this file needs <net/if.h> and <sys/mbuf.h> */
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#ifdef _KERNEL
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#include <sys/queue.h>
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/*
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* The packet filter hooks are designed for anything to call them to
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* possibly intercept the packet.
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*/
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struct packet_filter_hook {
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TAILQ_ENTRY(packet_filter_hook) pfil_link;
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int (*pfil_func) __P((void *, int, struct ifnet *, int,
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struct mbuf **));
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int pfil_flags;
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};
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#define PFIL_IN 0x00000001
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#define PFIL_OUT 0x00000002
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#define PFIL_WAITOK 0x00000008
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#define PFIL_ALL (PFIL_IN|PFIL_OUT)
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struct packet_filter_hook *pfil_hook_get __P((int));
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void pfil_add_hook __P((int (*func) __P((void *, int,
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struct ifnet *, int, struct mbuf **)), int));
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void pfil_remove_hook __P((int (*func) __P((void *, int,
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struct ifnet *, int, struct mbuf **)), int));
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#endif /* _KERNEL */
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/* XXX */
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#if defined(_KERNEL) && !defined(_LKM)
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#include "ipfilter.h"
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#endif
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#if NIPFILTER > 0
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#ifdef PFIL_HOOKS
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#undef PFIL_HOOKS
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#endif
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#define PFIL_HOOKS
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#endif /* NIPFILTER */
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#endif /* _NET_PFIL_H_ */
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