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_ */ 74