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Commit	Line	Data
	1	/* $NetBSD: pfil.h,v 1.22 2003/06/23 12:57:08 martin Exp $ */
	2	/* $DragonFly: src/sys/net/pfil.h,v 1.1 2003/12/02 09:18:17 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	#ifdef _KERNEL_OPT
	36	#include "opt_pfil_hooks.h"
	37	#endif
	38
	39	#include <sys/queue.h>
	40
	41	struct mbuf;
	42	struct ifnet;
	43
	44	/*
	45	* The packet filter hooks are designed for anything to call them to
	46	* possibly intercept the packet.
	47	*/
	48	struct packet_filter_hook {
	49	TAILQ_ENTRY(packet_filter_hook) pfil_link;
	50	int (pfil_func)(void , struct mbuf *, struct ifnet , int);
	51	void *pfil_arg;
	52	int pfil_flags;
	53	};
	54
	55	#define PFIL_IN 0x00000001
	56	#define PFIL_OUT 0x00000002
	57	#define PFIL_WAITOK 0x00000004
	58	#define PFIL_ALL (PFIL_IN\|PFIL_OUT)
	59
	60	typedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;
	61
	62	#define PFIL_TYPE_AF 1 /* key is AF_* type */
	63	#define PFIL_TYPE_IFNET 2 /* key is ifnet pointer */
	64
	65	struct pfil_head {
	66	pfil_list_t ph_in;
	67	pfil_list_t ph_out;
	68	int ph_type;
	69	union {
	70	u_long phu_val;
	71	void *phu_ptr;
	72	} ph_un;
	73	#define ph_af ph_un.phu_val
	74	#define ph_ifnet ph_un.phu_ptr
	75	LIST_ENTRY(pfil_head) ph_list;
	76	};
	77	typedef struct pfil_head pfil_head_t;
	78
	79	int pfil_run_hooks(struct pfil_head , struct mbuf , struct ifnet ,
	80	int);
	81
	82	int pfil_add_hook(int (func)(void , struct mbuf **,
	83	struct ifnet , int), void , int, struct pfil_head *);
	84	int pfil_remove_hook(int (func)(void , struct mbuf **,
	85	struct ifnet , int), void , int, struct pfil_head *);
	86
	87	int pfil_head_register(struct pfil_head *);
	88	int pfil_head_unregister(struct pfil_head *);
	89
	90	struct pfil_head *pfil_head_get(int, u_long);
	91
	92	static __inline struct packet_filter_hook *
	93	pfil_hook_get(int dir, struct pfil_head *ph)
	94	{
	95
	96	if (dir == PFIL_IN)
	97	return (TAILQ_FIRST(&ph->ph_in));
	98	else if (dir == PFIL_OUT)
	99	return (TAILQ_FIRST(&ph->ph_out));
	100	else
	101	return (NULL);
	102	}
	103
	104	/* XXX */
	105	#if defined(_KERNEL_OPT)
	106	#include "ipfilter.h"
	107	#endif
	108
	109	#if NIPFILTER > 0
	110	#ifdef PFIL_HOOKS
	111	#undef PFIL_HOOKS
	112	#endif
	113	#define PFIL_HOOKS
	114	#endif /* NIPFILTER */
	115
	116	#endif /* _NET_PFIL_H_ */