FreeBSD/Linux Kernel Cross Reference
sys/net/pfil.h

     /*      $FreeBSD: releng/5.0/sys/net/pfil.h 93084 2002-03-24 09:34:04Z bde $    */
     
     /*
      * 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_ */

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