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Commit	Line	Data
	1	/*
	2	* Copyright (c) 1999-2006 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28
	29	/*
	30	* Support for socket filter kernel extensions
	31	*/
	32
	33	#ifndef NET_KEXT_NET_H
	34	#define NET_KEXT_NET_H
	35
	36	#include <sys/appleapiopts.h>
	37
	38	#include <sys/queue.h>
	39	#include <sys/cdefs.h>
	40
	41	#ifdef BSD_KERNEL_PRIVATE
	42
	43	#include <sys/kpi_socketfilter.h>
	44
	45	/*
	46	* Internal implementation bits
	47	*/
	48
	49	struct socket_filter;
	50
	51	#define SFEF_DETACHUSEZERO 0x1 // Detach when use reaches zero
	52	#define SFEF_UNREGISTERING 0x2 // Remove due to unregister
	53
	54	struct socket_filter_entry {
	55	struct socket_filter_entry *sfe_next_onsocket;
	56	struct socket_filter_entry *sfe_next_onfilter;
	57
	58	struct socket_filter *sfe_filter;
	59	struct socket *sfe_socket;
	60	void *sfe_cookie;
	61
	62	u_int32_t sfe_flags;
	63	};
	64
	65	#define SFF_DETACHING 0x1
	66
	67	struct socket_filter {
	68	TAILQ_ENTRY(socket_filter) sf_protosw_next;
	69	TAILQ_ENTRY(socket_filter) sf_global_next;
	70	struct socket_filter_entry *sf_entry_head;
	71
	72	struct protosw *sf_proto;
	73	struct sflt_filter sf_filter;
	74	u_int32_t sf_flags;
	75	u_int32_t sf_usecount;
	76	};
	77
	78	TAILQ_HEAD(socket_filter_list, socket_filter);
	79
	80	/* Private, internal implementation functions */
	81	void sflt_init(void) __attribute__((section("__TEXT, initcode")));
	82	void sflt_initsock(struct socket *so);
	83	void sflt_termsock(struct socket *so);
	84	void sflt_use(struct socket *so);
	85	void sflt_unuse(struct socket *so);
	86	void sflt_notify(struct socket so, sflt_event_t event, void param);
	87	int sflt_data_in(struct socket so, const struct sockaddr from, mbuf_t *data,
	88	mbuf_t control, sflt_data_flag_t flags, int filtered);
	89	int sflt_attach_private(struct socket so, struct socket_filter filter, sflt_handle handle, int locked);
	90
	91	#endif /* BSD_KERNEL_PRIVATE */
	92
	93	#define NFF_BEFORE 0x01
	94	#define NFF_AFTER 0x02
	95
	96	#define NKE_OK 0
	97	#define NKE_REMOVE -1
	98
	99	/*
	100	* Interface structure for inserting an installed socket NKE into an
	101	* existing socket.
	102	* 'handle' is the NKE to be inserted, 'where' is an insertion point,
	103	* and flags dictate the position of the to-be-inserted NKE relative to
	104	* the 'where' NKE. If the latter is NULL, the flags indicate "first"
	105	* or "last"
	106	*/
	107	#pragma pack(4)
	108
	109	struct so_nke
	110	{ unsigned int nke_handle;
	111	unsigned int nke_where;
	112	int nke_flags; /* NFF_BEFORE, NFF_AFTER: net/kext_net.h */
	113	u_int32_t reserved[4]; /* for future use */
	114	};
	115
	116	#pragma pack()
	117
	118	#endif /* NET_KEXT_NET_H */
	119