[apple/xnu.git] / bsd / net / kpi_protocol.h

/*
 * Copyright (c) 2008 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*!
	@header kpi_protocol.h
	This header defines an API to interact with protocols in the kernel.
	The KPIs in this header file can be used to interact with protocols
	that already exist in the stack. These KPIs can be used to support
	existing protocols over media types that are not natively supported
	in the kernel, such as ATM.
 */

#ifndef __KPI_PROTOCOL__
#define __KPI_PROTOCOL__
#include <sys/kernel_types.h>
#include <net/kpi_interface.h>


__BEGIN_DECLS

/******************************************************************************/
/* Protocol input/inject                                                      */
/******************************************************************************/

#ifdef KERNEL_PRIVATE
/*!
	@typedef protocol_input_handler
	@discussion protocol_input_handler is called to input a packet. If
		your protocol has specified a global lock, the lock will be held
		when this funciton is called.
	@pararm protocol The protocol this packet is intended for.
	@param packet The packet that should be input.
 */
typedef void (*proto_input_handler)(protocol_family_t protocol, mbuf_t packet);

/*!
	@typedef proto_input_detached_handler
	@discussion proto_input_detached_handler is called to notify the
		protocol that it has been detached. When this function is
		called, the proto_input_handler will not be called again, making
		it safe to unload.
	@pararm protocol The protocol detached.
 */
typedef void (*proto_input_detached_handler)(protocol_family_t protocol);

/*!
	@function proto_register_input
	@discussion Allows the caller to specify the functions called when a
		packet for a protocol is received.
	@param protocol The protocol family these functions will receive
		packets for.
	@param input The function called when a packet is input.
	@param chains Input function supports packet chains.
	@result A errno error on failure.
 */
extern errno_t proto_register_input(protocol_family_t protocol,
    proto_input_handler input, proto_input_detached_handler detached,
    int chains);

/*!
	@function proto_unregister_input
	@discussion Allows the caller to unregister the input and inject
		functions for a protocol. The input/inject functions may not be
		unregistered immediately if there is a chance they are in use.
		To notify the owner when the functions are no longer in use, the
		proto_detached_handler function will be called. It is not safe
		to unload until the proto_detached_handler is called.
	@param protocol The protocol family these functions will receive
		packets for.
	@param input The function called when a packet is input.
	@param inject The function to called when a packet is injected (not
		on the normal input path).
	@result A errno error on failure.
 */
extern void proto_unregister_input(protocol_family_t protocol);
#endif /* KERNEL_PRIVATE */

/*!
	@function proto_input
	@discussion Inputs a packet on the specified protocol from the input
		path.
	@param protocol The protocol of the packet.
	@param packet The first packet in a chain of packets to be input.
	@result A errno error on failure. Unless proto_input returns zero,
		the caller is responsible for freeing the mbuf.
 */
extern errno_t proto_input(protocol_family_t protocol, mbuf_t packet);

/*!
	@function proto_inject
	@discussion Injects a packet on the specified protocol from
		anywhere. To avoid recursion, the protocol may need to queue the
		packet to be handled later.
	@param protocol The protocol of the packet.
	@param packet The first packet in a chain of packets to be injected.
	@result A errno error on failure. Unless proto_inject returns zero,
		the caller is responsible for freeing the mbuf.
 */
extern errno_t proto_inject(protocol_family_t protocol, mbuf_t packet);


/******************************************************************************/
/* Protocol plumbing                                                          */
/******************************************************************************/

/*!
	@typedef proto_plumb_handler
	@discussion proto_plumb_handler is called to attach a protocol to an
		interface. A typical protocol plumb function would fill out an
		ifnet_attach_proto_param and call ifnet_attach_protocol.
	@param ifp The interface the protocol should be attached to.
	@param protocol_family The protocol that should be attached to the
		interface.
	@result
		A non-zero value of the attach failed.
 */
typedef errno_t (*proto_plumb_handler)(ifnet_t ifp, protocol_family_t protocol);

/*!
	@typedef proto_unplumb_handler
	@discussion proto_unplumb_handler is called to detach a protocol
		from an interface. A typical unplumb function would call
		ifnet_detach_protocol and perform any necessary cleanup.
	@param ifp The interface the protocol should be detached from.
	@param protocol_family The protocol that should be detached from the
		interface.
 */
typedef void (*proto_unplumb_handler)(ifnet_t ifp, protocol_family_t protocol);

/*!
	@function proto_register_plumber
	@discussion Allows the caller to specify the functions called when a
		protocol is attached to an interface belonging to the specified
		family and when that protocol is detached.
	@param proto_fam The protocol family these plumbing functions will
		handle.
	@param if_fam The interface family these plumbing functions will
		handle.
	@param plumb The function to call to attach the protocol to an
		interface.
	@param unplumb The function to call to detach the protocol to an
		interface, may be NULL in which case ifnet_detach_protocol will
		be used to detach the protocol.
	@result A non-zero value of the attach failed.
 */
extern errno_t proto_register_plumber(protocol_family_t proto_fam,
    ifnet_family_t if_fam, proto_plumb_handler plumb,
    proto_unplumb_handler unplumb);

/*!
	@function proto_unregister_plumber
	@discussion Unregisters a previously registered plumbing function.
	@param proto_fam The protocol family these plumbing functions
		handle.
	@param if_fam The interface family these plumbing functions handle.
 */
extern void proto_unregister_plumber(protocol_family_t proto_fam,
    ifnet_family_t if_fam);

#ifdef KERNEL_PRIVATE
/*
	@function proto_plumb
	@discussion Plumbs a protocol to an actual interface.  This will find
		a registered protocol module and call its attach function.
		The module will typically call dlil_attach_protocol() with the
		appropriate parameters.
	@param protocol_family The protocol family.
	@param ifp The interface to plumb the protocol to.
	@result 0: No error.
		ENOENT: No module was registered.
		Other: Error returned by the attach_proto function
*/
extern errno_t proto_plumb(protocol_family_t protocol_family, ifnet_t ifp);

/*
	@function proto_unplumb
	@discussion Unplumbs a protocol from an interface.  This will find
		a registered protocol module and call its detach function.
		The module will typically call dlil_detach_protocol() with
		the appropriate parameters.  If no module is found, this
		function will call dlil_detach_protocol directly().
	@param protocol_family The protocol family.
	@param ifp The interface to unplumb the protocol from.
	@result 0: No error.
		ENOENT: No module was registered.
		Other: Error returned by the attach_proto function
*/
extern errno_t proto_unplumb(protocol_family_t protocol_family, ifnet_t ifp);

__private_extern__ void
proto_kpi_init(void) __attribute__((section("__TEXT, initcode")));

#endif /* KERNEL_PRIVATE */
__END_DECLS

#endif /* __KPI_PROTOCOL__ */
Commit	Line	Data
91447636	1	/*
b0d623f7	2	* Copyright (c) 2008 Apple Computer, Inc. All rights reserved.
5d5c5d0d	3	*
2d21ac55	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
91447636	5	*
2d21ac55 A	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.
8f6c56a5	14	*
2d21ac55 A	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
8f6c56a5 A	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
8f6c56a5 A	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
2d21ac55 A	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.
8f6c56a5	25	*
2d21ac55	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
91447636 A	27	*/
	28	/*!
	29	@header kpi_protocol.h
	30	This header defines an API to interact with protocols in the kernel.
	31	The KPIs in this header file can be used to interact with protocols
	32	that already exist in the stack. These KPIs can be used to support
	33	existing protocols over media types that are not natively supported
	34	in the kernel, such as ATM.
	35	*/
	36
	37	#ifndef __KPI_PROTOCOL__
	38	#define __KPI_PROTOCOL__
	39	#include <sys/kernel_types.h>
	40	#include <net/kpi_interface.h>
	41
	42
	43	__BEGIN_DECLS
	44
b0d623f7 A	45	/******************************************************************************/
	46	/* Protocol input/inject */
	47	/******************************************************************************/
91447636 A	48
	49	#ifdef KERNEL_PRIVATE
	50	/*!
	51	@typedef protocol_input_handler
	52	@discussion protocol_input_handler is called to input a packet. If
	53	your protocol has specified a global lock, the lock will be held
	54	when this funciton is called.
	55	@pararm protocol The protocol this packet is intended for.
	56	@param packet The packet that should be input.
	57	*/
	58	typedef void (*proto_input_handler)(protocol_family_t protocol, mbuf_t packet);
	59
	60	/*!
	61	@typedef proto_input_detached_handler
	62	@discussion proto_input_detached_handler is called to notify the
	63	protocol that it has been detached. When this function is
	64	called, the proto_input_handler will not be called again, making
	65	it safe to unload.
	66	@pararm protocol The protocol detached.
	67	*/
	68	typedef void (*proto_input_detached_handler)(protocol_family_t protocol);
	69
	70	/*!
	71	@function proto_register_input
	72	@discussion Allows the caller to specify the functions called when a
	73	packet for a protocol is received.
	74	@param protocol The protocol family these functions will receive
	75	packets for.
	76	@param input The function called when a packet is input.
2d21ac55	77	@param chains Input function supports packet chains.
91447636 A	78	@result A errno error on failure.
91447636 A	79	*/
b0d623f7 A	80	extern errno_t proto_register_input(protocol_family_t protocol,
	81	proto_input_handler input, proto_input_detached_handler detached,
	82	int chains);
91447636 A	83
	84	/*!
	85	@function proto_unregister_input
	86	@discussion Allows the caller to unregister the input and inject
	87	functions for a protocol. The input/inject functions may not be
	88	unregistered immediately if there is a chance they are in use.
	89	To notify the owner when the functions are no longer in use, the
	90	proto_detached_handler function will be called. It is not safe
	91	to unload until the proto_detached_handler is called.
	92	@param protocol The protocol family these functions will receive
	93	packets for.
	94	@param input The function called when a packet is input.
	95	@param inject The function to called when a packet is injected (not
	96	on the normal input path).
	97	@result A errno error on failure.
	98	*/
b0d623f7 A	99	extern void proto_unregister_input(protocol_family_t protocol);
b0d623f7 A	100	#endif /* KERNEL_PRIVATE */
91447636 A	101
	102	/*!
	103	@function proto_input
	104	@discussion Inputs a packet on the specified protocol from the input
	105	path.
	106	@param protocol The protocol of the packet.
	107	@param packet The first packet in a chain of packets to be input.
	108	@result A errno error on failure. Unless proto_input returns zero,
	109	the caller is responsible for freeing the mbuf.
	110	*/
b0d623f7	111	extern errno_t proto_input(protocol_family_t protocol, mbuf_t packet);
91447636 A	112
	113	/*!
	114	@function proto_inject
	115	@discussion Injects a packet on the specified protocol from
	116	anywhere. To avoid recursion, the protocol may need to queue the
	117	packet to be handled later.
	118	@param protocol The protocol of the packet.
	119	@param packet The first packet in a chain of packets to be injected.
	120	@result A errno error on failure. Unless proto_inject returns zero,
	121	the caller is responsible for freeing the mbuf.
	122	*/
b0d623f7	123	extern errno_t proto_inject(protocol_family_t protocol, mbuf_t packet);
91447636 A	124
91447636 A	125
b0d623f7 A	126	/******************************************************************************/
	127	/* Protocol plumbing */
	128	/******************************************************************************/
91447636 A	129
	130	/*!
	131	@typedef proto_plumb_handler
	132	@discussion proto_plumb_handler is called to attach a protocol to an
	133	interface. A typical protocol plumb function would fill out an
	134	ifnet_attach_proto_param and call ifnet_attach_protocol.
	135	@param ifp The interface the protocol should be attached to.
	136	@param protocol_family The protocol that should be attached to the
	137	interface.
	138	@result
	139	A non-zero value of the attach failed.
	140	*/
	141	typedef errno_t (*proto_plumb_handler)(ifnet_t ifp, protocol_family_t protocol);
	142
	143	/*!
	144	@typedef proto_unplumb_handler
	145	@discussion proto_unplumb_handler is called to detach a protocol
	146	from an interface. A typical unplumb function would call
	147	ifnet_detach_protocol and perform any necessary cleanup.
	148	@param ifp The interface the protocol should be detached from.
	149	@param protocol_family The protocol that should be detached from the
	150	interface.
	151	*/
	152	typedef void (*proto_unplumb_handler)(ifnet_t ifp, protocol_family_t protocol);
	153
	154	/*!
	155	@function proto_register_plumber
b0d623f7 A	156	@discussion Allows the caller to specify the functions called when a
	157	protocol is attached to an interface belonging to the specified
	158	family and when that protocol is detached.
91447636 A	159	@param proto_fam The protocol family these plumbing functions will
	160	handle.
	161	@param if_fam The interface family these plumbing functions will
	162	handle.
	163	@param plumb The function to call to attach the protocol to an
	164	interface.
	165	@param unplumb The function to call to detach the protocol to an
	166	interface, may be NULL in which case ifnet_detach_protocol will
	167	be used to detach the protocol.
	168	@result A non-zero value of the attach failed.
	169	*/
b0d623f7 A	170	extern errno_t proto_register_plumber(protocol_family_t proto_fam,
	171	ifnet_family_t if_fam, proto_plumb_handler plumb,
	172	proto_unplumb_handler unplumb);
91447636 A	173
	174	/*!
	175	@function proto_unregister_plumber
	176	@discussion Unregisters a previously registered plumbing function.
	177	@param proto_fam The protocol family these plumbing functions
	178	handle.
	179	@param if_fam The interface family these plumbing functions handle.
	180	*/
b0d623f7 A	181	extern void proto_unregister_plumber(protocol_family_t proto_fam,
b0d623f7 A	182	ifnet_family_t if_fam);
91447636	183
2d21ac55	184	#ifdef KERNEL_PRIVATE
b0d623f7 A	185	/*
	186	@function proto_plumb
	187	@discussion Plumbs a protocol to an actual interface. This will find
	188	a registered protocol module and call its attach function.
	189	The module will typically call dlil_attach_protocol() with the
	190	appropriate parameters.
	191	@param protocol_family The protocol family.
	192	@param ifp The interface to plumb the protocol to.
	193	@result 0: No error.
	194	ENOENT: No module was registered.
	195	Other: Error returned by the attach_proto function
2d21ac55	196	*/
b0d623f7	197	extern errno_t proto_plumb(protocol_family_t protocol_family, ifnet_t ifp);
2d21ac55	198
b0d623f7 A	199	/*
	200	@function proto_unplumb
	201	@discussion Unplumbs a protocol from an interface. This will find
	202	a registered protocol module and call its detach function.
	203	The module will typically call dlil_detach_protocol() with
	204	the appropriate parameters. If no module is found, this
	205	function will call dlil_detach_protocol directly().
	206	@param protocol_family The protocol family.
	207	@param ifp The interface to unplumb the protocol from.
	208	@result 0: No error.
	209	ENOENT: No module was registered.
	210	Other: Error returned by the attach_proto function
2d21ac55	211	*/
b0d623f7	212	extern errno_t proto_unplumb(protocol_family_t protocol_family, ifnet_t ifp);
2d21ac55	213
b0d623f7 A	214	__private_extern__ void
b0d623f7 A	215	proto_kpi_init(void) __attribute__((section("__TEXT, initcode")));
2d21ac55	216
b0d623f7	217	#endif /* KERNEL_PRIVATE */
91447636	218	__END_DECLS
6601e61a	219
b0d623f7	220	#endif /* __KPI_PROTOCOL__ */