1 /* $FreeBSD$ */ 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 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 23 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 25 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 26 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #ifndef _NET_PFIL_H_ 32 #define _NET_PFIL_H_ 33 34 #include <sys/queue.h> 35 36 struct mbuf; 37 struct ifnet; 38 39 /* 40 * The packet filter hooks are designed for anything to call them to 41 * possibly intercept the packet. 42 */ 43 struct packet_filter_hook { 44 TAILQ_ENTRY(packet_filter_hook) pfil_link; 45 int (*pfil_func)(void *, int, struct ifnet *, int, struct mbuf **); 46 int pfil_flags; 47 }; 48 49 #define PFIL_IN 0x00000001 50 #define PFIL_OUT 0x00000002 51 #define PFIL_WAITOK 0x00000004 52 #define PFIL_ALL (PFIL_IN|PFIL_OUT) 53 54 typedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t; 55 56 struct pfil_head { 57 pfil_list_t ph_in; 58 pfil_list_t ph_out; 59 int ph_init; 60 }; 61 62 struct packet_filter_hook *pfil_hook_get(int, struct pfil_head *); 63 int pfil_add_hook(int (*func)(void *, int, 64 struct ifnet *, int, struct mbuf **), int, struct pfil_head *); 65 int pfil_remove_hook(int (*func)(void *, int, 66 struct ifnet *, int, struct mbuf **), int, struct pfil_head *); 67 68 /* XXX */ 69 #if defined(_KERNEL) && !defined(KLD_MODULE) 70 #include "opt_ipfilter.h" 71 #endif 72 73 #if IPFILTER > 0 74 #ifdef PFIL_HOOKS 75 #undef PFIL_HOOKS 76 #endif 77 #define PFIL_HOOKS 78 #endif /* IPFILTER */ 79 80 #endif /* _NET_PFIL_H_ */ 81