LCOM1920-T02G10

/*        $NetBSD: pfil.h,v 1.31 2013/06/29 21:06:58 rmind 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.

 *

 * 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.

 */

typedef int (*pfil_func_t)(void *, struct mbuf **, struct ifnet *, int);

#define PFIL_IN                0x00000001

#define PFIL_OUT        0x00000002

#define PFIL_ALL        (PFIL_IN|PFIL_OUT)

#define PFIL_IFADDR        0x00000008

#define PFIL_IFNET        0x00000010

/* events notified by PFIL_IFNET */

#define        PFIL_IFNET_ATTACH        0

#define        PFIL_IFNET_DETACH        1

#define        PFIL_TYPE_AF                1        /* key is AF_* type */

#define        PFIL_TYPE_IFNET                2        /* key is ifnet pointer */

typedef struct pfil_head        pfil_head_t;

#ifdef _KERNEL

int        pfil_run_hooks(pfil_head_t *, struct mbuf **, struct ifnet *, int);

int        pfil_add_hook(pfil_func_t, void *, int, pfil_head_t *);

int        pfil_remove_hook(pfil_func_t, void *, int, pfil_head_t *);

pfil_head_t *        pfil_head_create(int, void *);

void                pfil_head_destroy(pfil_head_t *);

pfil_head_t *        pfil_head_get(int, void *);

/* Packet filtering hook for interfaces (in sys/net/if.c module). */

extern pfil_head_t *if_pfil;

#endif /* _KERNEL */

#endif /* !_NET_PFIL_H_ */