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

     /*      $NetBSD: pfil.h,v 1.22 2003/06/23 12:57:08 martin Exp $ */
     /* $DragonFly: src/sys/net/pfil.h,v 1.11 2008/09/20 06:08:13 sephe 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_
    
    #ifndef _SYS_TYPES_H_
    #include <sys/types.h>
    #endif
    #ifndef _SYS_PARAM_H_
    #include <sys/param.h>
    #endif
    #ifndef _SYS_QUEUE_H_
    #include <sys/queue.h>
    #endif
    
    struct mbuf;
    struct ifnet;
    struct packet_filter_hook;
    
    typedef int     (*pfil_func_t)(void *, struct mbuf **, struct ifnet *, int);
    
    #define PFIL_IN         0x00000001
    #define PFIL_OUT        0x00000002
    #define PFIL_MPSAFE     0x00000004
    #define PFIL_ALL        (PFIL_IN|PFIL_OUT)
    
    typedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;
    
    #define PFIL_TYPE_AF            1       /* key is AF_* type */
    #define PFIL_TYPE_IFNET         2       /* key is ifnet pointer */
    
    struct pfil_head {
            pfil_list_t     *ph_in;
            pfil_list_t     *ph_out;
            int             ph_type;
            int             ph_hashooks;    /* 0 if no hooks installed */
            union {
                    u_long          phu_val;
                    void            *phu_ptr;
            } ph_un;
    #define ph_af           ph_un.phu_val
    #define ph_ifnet        ph_un.phu_ptr
            LIST_ENTRY(pfil_head) ph_list;
    };
    typedef struct pfil_head pfil_head_t;
    
    int     pfil_run_hooks(struct pfil_head *, struct mbuf **, struct ifnet *, int);
    
    int     pfil_add_hook(pfil_func_t, void *, int, struct pfil_head *);
    int     pfil_remove_hook(pfil_func_t, void *, int, struct pfil_head *);
    
    int     pfil_head_register(struct pfil_head *);
    int     pfil_head_unregister(struct pfil_head *);
    
    struct pfil_head *pfil_head_get(int, u_long);
    
    /*
     * Used for a quick shortcut around the pfil routines if no hooks have been
     * installed.
     */
    static __inline int
    pfil_has_hooks(struct pfil_head *ph)
    {
            return(ph->ph_hashooks);
    }
    
    /* XXX */
    #if defined(_KERNEL_OPT)
    #include "ipfilter.h"
    #endif
   
   #endif /* _NET_PFIL_H_ */

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