sys/net/pfil.h

   1 /*      $NetBSD: pfil.h,v 1.31 2013/06/29 21:06:58 rmind Exp $  */
   2
   3 /*
   4  * Copyright (c) 1996 Matthew R. Green
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #ifndef _NET_PFIL_H_
  30 #define _NET_PFIL_H_
  31
  32 #include <sys/queue.h>
  33
  34 struct mbuf;
  35 struct ifnet;
  36
  37 /*
  38  * The packet filter hooks are designed for anything to call them to
  39  * possibly intercept the packet.
  40  */
  41 typedef int (*pfil_func_t)(void *, struct mbuf **, struct ifnet *, int);
  42
  43 #define PFIL_IN         0x00000001
  44 #define PFIL_OUT        0x00000002
  45 #define PFIL_ALL        (PFIL_IN|PFIL_OUT)
  46 #define PFIL_IFADDR     0x00000008
  47 #define PFIL_IFNET      0x00000010
  48
  49 /* events notified by PFIL_IFNET */
  50 #define PFIL_IFNET_ATTACH       0
  51 #define PFIL_IFNET_DETACH       1
  52
  53 #define PFIL_TYPE_AF            1       /* key is AF_* type */
  54 #define PFIL_TYPE_IFNET         2       /* key is ifnet pointer */
  55
  56 typedef struct pfil_head        pfil_head_t;
  57
  58 #ifdef _KERNEL
  59
  60 int     pfil_run_hooks(pfil_head_t *, struct mbuf **, struct ifnet *, int);
  61 int     pfil_add_hook(pfil_func_t, void *, int, pfil_head_t *);
  62 int     pfil_remove_hook(pfil_func_t, void *, int, pfil_head_t *);
  63
  64 pfil_head_t *   pfil_head_create(int, void *);
  65 void            pfil_head_destroy(pfil_head_t *);
  66 pfil_head_t *   pfil_head_get(int, void *);
  67
  68 /* Packet filtering hook for interfaces (in sys/net/if.c module). */
  69 extern pfil_head_t *if_pfil;
  70
  71 #endif /* _KERNEL */
  72
  73 #endif /* !_NET_PFIL_H_ */