WebSVN – HelenOS – Blame – //branches/network/uspace/srv/net/nil/eth/eth_header.h

Rev	Author	Line No.	Line
3992	mejdrech	1	/*
		2	* Copyright (c) 2009 Lukas Mejdrech
		3	* All rights reserved.
		4	*
		5	* Redistribution and use in source and binary forms, with or without
		6	* modification, are permitted provided that the following conditions
		7	* are met:
		8	*
		9	* - Redistributions of source code must retain the above copyright
		10	* notice, this list of conditions and the following disclaimer.
		11	* - Redistributions in binary form must reproduce the above copyright
		12	* notice, this list of conditions and the following disclaimer in the
		13	* documentation and/or other materials provided with the distribution.
		14	* - The name of the author may not be used to endorse or promote products
		15	* derived from this software without specific prior written permission.
		16	*
		17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
		18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
		19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
		20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
		21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
		22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
		23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
		24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
		25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
		26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
		27	*/
		28
		29	/** @addtogroup eth
		30	* @{
		31	*/
		32
		33	/** @file
		34	* Ethernet protocol header definitions.
4728	mejdrech	35	* Based on the IEEE~802.3-2005
3992	mejdrech	36	*/
		37
		38	#ifndef __NET_ETH_HEADER_H__
		39	#define __NET_ETH_HEADER_H__
		40
		41	#include <sys/types.h>
		42
4350	mejdrech	43	/** Ethernet address length.
		44	*/
3992	mejdrech	45	#define ETH_ADDR 6
		46
4350	mejdrech	47	/** Ethernet header preamble value.
		48	*/
3992	mejdrech	49	#define ETH_PREAMBLE 0x55
		50
4350	mejdrech	51	/** Ethernet header start of frame value.
		52	*/
4075	mejdrech	53	#define ETH_SFD 0xD5
3992	mejdrech	54
		55	/** Type definition of the Ethernet header with all the extensions.
		56	* @see eth_header_ex
		57	*/
		58	typedef struct eth_header_ex eth_header_ex_t;
		59
		60	/** Type definition of the Ethernet header with all the extensions pointer.
		61	* @see eth_header
		62	*/
		63	typedef eth_header_ex_t * eth_header_ex_ref;
		64
		65	/** Type definition of the Ethernet header LSAP extension.
		66	* @see eth_header_lsap
		67	*/
		68	typedef struct eth_header_lsap eth_header_lsap_t;
		69
		70	/** Type definition of the Ethernet header LSAP extension pointer.
		71	* @see eth_header_lsap
		72	*/
		73	typedef eth_header_lsap_t * eth_header_lsap_ref;
		74
		75	/** Type definition of the Ethernet header SNAP extension.
		76	* @see eth_header_snap
		77	*/
		78	typedef struct eth_header_snap eth_header_snap_t;
		79
		80	/** Type definition of the Ethernet header SNAP extension pointer.
		81	* @see eth_header_snap
		82	*/
		83	typedef eth_header_snap_t * eth_header_snap_ref;
		84
4153	mejdrech	85	/** Type definition of the Ethernet header preamble.
		86	* @see preamble
		87	*/
		88	typedef struct eth_preamble eth_preamble_t;
		89
		90	/** Type definition of the Ethernet header preamble pointer.
		91	* @see eth_preamble
		92	*/
		93	typedef eth_preamble_t * eth_preamble_ref;
		94
3992	mejdrech	95	/** Type definition of the Ethernet header.
		96	* @see eth_header
		97	*/
		98	typedef struct eth_header eth_header_t;
		99
		100	/** Type definition of the Ethernet header pointer.
		101	* @see eth_header
		102	*/
		103	typedef eth_header_t * eth_header_ref;
		104
		105	/** Ethernet header Link Service Access Point extension.
		106	*/
		107	struct eth_header_lsap{
		108	/** Destination Service Access Point identifier.
		109	* The possible values are assigned by an IEEE committee.
		110	*/
		111	uint8_t dsap;
		112	/** Source Service Access Point identifier.
		113	* The possible values are assigned by an IEEE committee.
		114	*/
		115	uint8_t ssap;
		116	/** Control parameter.
		117	* The possible values are assigned by an IEEE committee.
		118	*/
		119	uint8_t ctrl;
4243	mejdrech	120	} __attribute__ ((packed));
3992	mejdrech	121
		122	/** Ethernet header SNAP extension.
		123	*/
		124	struct eth_header_snap{
		125	/** Protocol identifier or organization code.
		126	*/
4728	mejdrech	127	uint8_t protocol[ 3 ];
3992	mejdrech	128	/** Ethernet protocol identifier in the network byte order (big endian).
		129	* @see ethernet_protocols.h
		130	*/
		131	uint16_t ethertype;
4243	mejdrech	132	} __attribute__ ((packed));
3992	mejdrech	133
4153	mejdrech	134	/** Ethernet header preamble.
		135	* Used for dummy devices.
3992	mejdrech	136	*/
4153	mejdrech	137	struct eth_preamble{
3992	mejdrech	138	/** Controlling preamble used for the frame transmission synchronization.
		139	* All should be set to ETH_PREAMBLE.
		140	*/
		141	uint8_t preamble[ 7 ];
		142	/** Start of Frame Delimiter used for the frame transmission synchronization.
		143	* Should be set to ETH_SFD.
		144	*/
		145	uint8_t sfd;
4243	mejdrech	146	} __attribute__ ((packed));
4153	mejdrech	147
		148	/** Ethernet header.
		149	*/
		150	struct eth_header{
3992	mejdrech	151	/** Destination host Ethernet address (MAC address).
		152	*/
4728	mejdrech	153	uint8_t destination_address[ ETH_ADDR ];
3992	mejdrech	154	/** Source host Ethernet address (MAC address).
		155	*/
4728	mejdrech	156	uint8_t source_address[ ETH_ADDR ];
3992	mejdrech	157	/** Ethernet protocol identifier in the network byte order (big endian).
		158	* @see ethernet_protocols.h
		159	*/
		160	uint16_t ethertype;
4243	mejdrech	161	} __attribute__ ((packed));
3992	mejdrech	162
		163	/** Ethernet header with all the extensions.
		164	*/
		165	struct eth_header_ex{
		166	/** Ethernet header.
		167	*/
		168	eth_header_t header;
		169	/** LSAP extension.
		170	* If DSAP and SSAP are set to ETH_LSAP_SNAP the SNAP extension is being used.
		171	* If DSAP and SSAP fields are equal to ETH_RAW the raw Ethernet packet without any extensions is being used and the frame content starts rigth after the two fields.
		172	*/
		173	eth_header_lsap_t lsap;
		174	/** SNAP extension.
		175	*/
		176	eth_header_snap_t snap;
4243	mejdrech	177	} __attribute__ ((packed));
3992	mejdrech	178
4075	mejdrech	179	/** Ethernet Frame Check Sequence.
		180	*/
		181	typedef uint32_t eth_fcs_t;
		182
		183	/** Ethernet Frame Check Sequence pointer.
		184	*/
		185	typedef eth_fcs_t * eth_fcs_ref;
		186
3992	mejdrech	187	#endif
		188
		189	/** @}
		190	*/

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