1 /* $NetBSD: pfil.h,v 1.22 2003/06/23 12:57:08 martin Exp $ */ 2 /* $DragonFly: src/sys/net/pfil.h,v 1.4 2004/07/14 08:01:16 asmodai Exp $ */ 3 4 /* 5 * Copyright (c) 1996 Matthew R. Green 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #ifndef _NET_PFIL_H_ 33 #define _NET_PFIL_H_ 34 35 #include <sys/queue.h> 36 37 struct mbuf; 38 struct ifnet; 39 40 /* 41 * The packet filter hooks are designed for anything to call them to 42 * possibly intercept the packet. 43 */ 44 struct packet_filter_hook { 45 TAILQ_ENTRY(packet_filter_hook) pfil_link; 46 int (*pfil_func)(void *, struct mbuf **, struct ifnet *, int); 47 void *pfil_arg; 48 int pfil_flags; 49 }; 50 51 #define PFIL_IN 0x00000001 52 #define PFIL_OUT 0x00000002 53 #define PFIL_WAITOK 0x00000004 54 #define PFIL_ALL (PFIL_IN|PFIL_OUT) 55 56 typedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t; 57 58 #define PFIL_TYPE_AF 1 /* key is AF_* type */ 59 #define PFIL_TYPE_IFNET 2 /* key is ifnet pointer */ 60 61 struct pfil_head { 62 pfil_list_t ph_in; 63 pfil_list_t ph_out; 64 int ph_type; 65 int ph_hashooks; /* 0 if no hooks installed */ 66 union { 67 u_long phu_val; 68 void *phu_ptr; 69 } ph_un; 70 #define ph_af ph_un.phu_val 71 #define ph_ifnet ph_un.phu_ptr 72 LIST_ENTRY(pfil_head) ph_list; 73 }; 74 typedef struct pfil_head pfil_head_t; 75 76 int pfil_run_hooks(struct pfil_head *, struct mbuf **, struct ifnet *, int); 77 78 int pfil_add_hook(int (*func)(void *, struct mbuf **, 79 struct ifnet *, int), void *, int, struct pfil_head *); 80 int pfil_remove_hook(int (*func)(void *, struct mbuf **, 81 struct ifnet *, int), void *, int, struct pfil_head *); 82 83 int pfil_head_register(struct pfil_head *); 84 int pfil_head_unregister(struct pfil_head *); 85 86 struct pfil_head *pfil_head_get(int, u_long); 87 88 static __inline struct packet_filter_hook * 89 pfil_hook_get(int dir, struct pfil_head *ph) 90 { 91 92 if (dir == PFIL_IN) 93 return (TAILQ_FIRST(&ph->ph_in)); 94 else if (dir == PFIL_OUT) 95 return (TAILQ_FIRST(&ph->ph_out)); 96 else 97 return (NULL); 98 } 99 100 /* 101 * Used for a quick shortcut around the pfil routines if no hooks have been 102 * installed. 103 */ 104 static __inline int 105 pfil_has_hooks(struct pfil_head *ph) 106 { 107 return(ph->ph_hashooks); 108 } 109 110 /* XXX */ 111 #if defined(_KERNEL_OPT) 112 #include "ipfilter.h" 113 #endif 114 115 #endif /* _NET_PFIL_H_ */ 116