113 lines
3.6 KiB
C
113 lines
3.6 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: pfil.h,v 1.22 2003/06/23 12:57:08 martin 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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#include <sys/systm.h>
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#include <sys/queue.h>
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <sys/condvar.h> /* XXX */
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struct mbuf;
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struct ifnet;
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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)(void *, struct mbuf **, struct ifnet *, int);
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void *pfil_arg;
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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 0x00000004
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#define PFIL_ALL (PFIL_IN|PFIL_OUT)
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typedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;
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#define PFIL_TYPE_AF 1 /* key is AF_* type */
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#define PFIL_TYPE_IFNET 2 /* key is ifnet pointer */
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struct pfil_head {
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pfil_list_t ph_in;
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pfil_list_t ph_out;
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int ph_type;
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/*
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* Locking: use a busycounter per pfil_head.
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* Use ph_busy_count = -1 to indicate pfil_head is empty.
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*/
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int ph_busy_count; /* count of threads with read lock */
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int ph_want_write; /* want write lock flag */
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struct cv ph_cv; /* for waking up writers */
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struct mtx ph_mtx; /* mutex on locking state */
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union {
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u_long phu_val;
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void *phu_ptr;
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} ph_un;
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#define ph_af ph_un.phu_val
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#define ph_ifnet ph_un.phu_ptr
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LIST_ENTRY(pfil_head) ph_list;
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};
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int pfil_run_hooks(struct pfil_head *, struct mbuf **, struct ifnet *,
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int);
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int pfil_add_hook(int (*func)(void *, struct mbuf **,
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struct ifnet *, int), void *, int, struct pfil_head *);
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int pfil_remove_hook(int (*func)(void *, struct mbuf **,
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struct ifnet *, int), void *, int, struct pfil_head *);
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int pfil_head_register(struct pfil_head *);
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int pfil_head_unregister(struct pfil_head *);
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struct pfil_head *pfil_head_get(int, u_long);
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static __inline struct packet_filter_hook *
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pfil_hook_get(int dir, struct pfil_head *ph)
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{
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KASSERT(ph->ph_busy_count > 0,
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("pfil_hook_get: called on unbusy pfil_head"));
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if (dir == PFIL_IN)
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return (TAILQ_FIRST(&ph->ph_in));
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else if (dir == PFIL_OUT)
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return (TAILQ_FIRST(&ph->ph_out));
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else
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return (NULL);
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}
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#endif /* _NET_PFIL_H_ */
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