[deliverable/linux.git] / net / ethernet / eth.c

/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Ethernet-type device handling.
 *
 * Version:	@(#)eth.c	1.0.7	05/25/93
 *
 * Authors:	Ross Biro
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *		Mark Evans, <evansmp@uhura.aston.ac.uk>
 *		Florian  La Roche, <rzsfl@rz.uni-sb.de>
 *		Alan Cox, <gw4pts@gw4pts.ampr.org>
 *
 * Fixes:
 *		Mr Linux	: Arp problems
 *		Alan Cox	: Generic queue tidyup (very tiny here)
 *		Alan Cox	: eth_header ntohs should be htons
 *		Alan Cox	: eth_rebuild_header missing an htons and
 *				  minor other things.
 *		Tegge		: Arp bug fixes.
 *		Florian		: Removed many unnecessary functions, code cleanup
 *				  and changes for new arp and skbuff.
 *		Alan Cox	: Redid header building to reflect new format.
 *		Alan Cox	: ARP only when compiled with CONFIG_INET
 *		Greg Page	: 802.2 and SNAP stuff.
 *		Alan Cox	: MAC layer pointers/new format.
 *		Paul Gortmaker	: eth_copy_and_sum shouldn't csum padding.
 *		Alan Cox	: Protect against forwarding explosions with
 *				  older network drivers and IFF_ALLMULTI.
 *	Christer Weinigel	: Better rebuild header message.
 *             Andrew Morton    : 26Feb01: kill ether_setup() - use netdev_boot_setup().
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <linux/ip.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/if_ether.h>
#include <net/dst.h>
#include <net/arp.h>
#include <net/sock.h>
#include <net/ipv6.h>
#include <net/ip.h>
#include <net/dsa.h>
#include <linux/uaccess.h>

__setup("ether=", netdev_boot_setup);

/**
 * eth_header - create the Ethernet header
 * @skb:	buffer to alter
 * @dev:	source device
 * @type:	Ethernet type field
 * @daddr: destination address (NULL leave destination address)
 * @saddr: source address (NULL use device source address)
 * @len:   packet length (<= skb->len)
 *
 *
 * Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length
 * in here instead.
 */
int eth_header(struct sk_buff *skb, struct net_device *dev,
	       unsigned short type,
	       const void *daddr, const void *saddr, unsigned int len)
{
	struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN);

	if (type != ETH_P_802_3 && type != ETH_P_802_2)
		eth->h_proto = htons(type);
	else
		eth->h_proto = htons(len);

	/*
	 *      Set the source hardware address.
	 */

	if (!saddr)
		saddr = dev->dev_addr;
	memcpy(eth->h_source, saddr, ETH_ALEN);

	if (daddr) {
		memcpy(eth->h_dest, daddr, ETH_ALEN);
		return ETH_HLEN;
	}

	/*
	 *      Anyway, the loopback-device should never use this function...
	 */

	if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
		memset(eth->h_dest, 0, ETH_ALEN);
		return ETH_HLEN;
	}

	return -ETH_HLEN;
}
EXPORT_SYMBOL(eth_header);

/**
 * eth_rebuild_header- rebuild the Ethernet MAC header.
 * @skb: socket buffer to update
 *
 * This is called after an ARP or IPV6 ndisc it's resolution on this
 * sk_buff. We now let protocol (ARP) fill in the other fields.
 *
 * This routine CANNOT use cached dst->neigh!
 * Really, it is used only when dst->neigh is wrong.
 */
int eth_rebuild_header(struct sk_buff *skb)
{
	struct ethhdr *eth = (struct ethhdr *)skb->data;
	struct net_device *dev = skb->dev;

	switch (eth->h_proto) {
#ifdef CONFIG_INET
	case htons(ETH_P_IP):
		return arp_find(eth->h_dest, skb);
#endif
	default:
		netdev_dbg(dev,
		       "%s: unable to resolve type %X addresses.\n",
		       dev->name, ntohs(eth->h_proto));

		memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
		break;
	}

	return 0;
}
EXPORT_SYMBOL(eth_rebuild_header);

/**
 * eth_type_trans - determine the packet's protocol ID.
 * @skb: received socket data
 * @dev: receiving network device
 *
 * The rule here is that we
 * assume 802.3 if the type field is short enough to be a length.
 * This is normal practice and works for any 'now in use' protocol.
 */
__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
{
	unsigned short _service_access_point;
	const unsigned short *sap;
	const struct ethhdr *eth;

	skb->dev = dev;
	skb_reset_mac_header(skb);
	skb_pull_inline(skb, ETH_HLEN);
	eth = eth_hdr(skb);

	if (unlikely(is_multicast_ether_addr(eth->h_dest))) {
		if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
			skb->pkt_type = PACKET_BROADCAST;
		else
			skb->pkt_type = PACKET_MULTICAST;
	}
	else if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
						   dev->dev_addr)))
		skb->pkt_type = PACKET_OTHERHOST;

	/*
	 * Some variants of DSA tagging don't have an ethertype field
	 * at all, so we check here whether one of those tagging
	 * variants has been configured on the receiving interface,
	 * and if so, set skb->protocol without looking at the packet.
	 */
	if (unlikely(netdev_uses_dsa(dev)))
		return htons(ETH_P_XDSA);

	if (likely(ntohs(eth->h_proto) >= ETH_P_802_3_MIN))
		return eth->h_proto;

	/*
	 *      This is a magic hack to spot IPX packets. Older Novell breaks
	 *      the protocol design and runs IPX over 802.3 without an 802.2 LLC
	 *      layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
	 *      won't work for fault tolerant netware but does for the rest.
	 */
	sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point);
	if (sap && *sap == 0xFFFF)
		return htons(ETH_P_802_3);

	/*
	 *      Real 802.2 LLC
	 */
	return htons(ETH_P_802_2);
}
EXPORT_SYMBOL(eth_type_trans);

/**
 * eth_header_parse - extract hardware address from packet
 * @skb: packet to extract header from
 * @haddr: destination buffer
 */
int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr)
{
	const struct ethhdr *eth = eth_hdr(skb);
	memcpy(haddr, eth->h_source, ETH_ALEN);
	return ETH_ALEN;
}
EXPORT_SYMBOL(eth_header_parse);

/**
 * eth_header_cache - fill cache entry from neighbour
 * @neigh: source neighbour
 * @hh: destination cache entry
 * @type: Ethernet type field
 *
 * Create an Ethernet header template from the neighbour.
 */
int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type)
{
	struct ethhdr *eth;
	const struct net_device *dev = neigh->dev;

	eth = (struct ethhdr *)
	    (((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth))));

	if (type == htons(ETH_P_802_3))
		return -1;

	eth->h_proto = type;
	memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
	memcpy(eth->h_dest, neigh->ha, ETH_ALEN);
	hh->hh_len = ETH_HLEN;
	return 0;
}
EXPORT_SYMBOL(eth_header_cache);

/**
 * eth_header_cache_update - update cache entry
 * @hh: destination cache entry
 * @dev: network device
 * @haddr: new hardware address
 *
 * Called by Address Resolution module to notify changes in address.
 */
void eth_header_cache_update(struct hh_cache *hh,
			     const struct net_device *dev,
			     const unsigned char *haddr)
{
	memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
	       haddr, ETH_ALEN);
}
EXPORT_SYMBOL(eth_header_cache_update);

/**
 * eth_prepare_mac_addr_change - prepare for mac change
 * @dev: network device
 * @p: socket address
 */
int eth_prepare_mac_addr_change(struct net_device *dev, void *p)
{
	struct sockaddr *addr = p;

	if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
		return -EBUSY;
	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;
	return 0;
}
EXPORT_SYMBOL(eth_prepare_mac_addr_change);

/**
 * eth_commit_mac_addr_change - commit mac change
 * @dev: network device
 * @p: socket address
 */
void eth_commit_mac_addr_change(struct net_device *dev, void *p)
{
	struct sockaddr *addr = p;

	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
}
EXPORT_SYMBOL(eth_commit_mac_addr_change);

/**
 * eth_mac_addr - set new Ethernet hardware address
 * @dev: network device
 * @p: socket address
 *
 * Change hardware address of device.
 *
 * This doesn't change hardware matching, so needs to be overridden
 * for most real devices.
 */
int eth_mac_addr(struct net_device *dev, void *p)
{
	int ret;

	ret = eth_prepare_mac_addr_change(dev, p);
	if (ret < 0)
		return ret;
	eth_commit_mac_addr_change(dev, p);
	return 0;
}
EXPORT_SYMBOL(eth_mac_addr);

/**
 * eth_change_mtu - set new MTU size
 * @dev: network device
 * @new_mtu: new Maximum Transfer Unit
 *
 * Allow changing MTU size. Needs to be overridden for devices
 * supporting jumbo frames.
 */
int eth_change_mtu(struct net_device *dev, int new_mtu)
{
	if (new_mtu < 68 || new_mtu > ETH_DATA_LEN)
		return -EINVAL;
	dev->mtu = new_mtu;
	return 0;
}
EXPORT_SYMBOL(eth_change_mtu);

int eth_validate_addr(struct net_device *dev)
{
	if (!is_valid_ether_addr(dev->dev_addr))
		return -EADDRNOTAVAIL;

	return 0;
}
EXPORT_SYMBOL(eth_validate_addr);

const struct header_ops eth_header_ops ____cacheline_aligned = {
	.create		= eth_header,
	.parse		= eth_header_parse,
	.rebuild	= eth_rebuild_header,
	.cache		= eth_header_cache,
	.cache_update	= eth_header_cache_update,
};

/**
 * ether_setup - setup Ethernet network device
 * @dev: network device
 *
 * Fill in the fields of the device structure with Ethernet-generic values.
 */
void ether_setup(struct net_device *dev)
{
	dev->header_ops		= &eth_header_ops;
	dev->type		= ARPHRD_ETHER;
	dev->hard_header_len 	= ETH_HLEN;
	dev->mtu		= ETH_DATA_LEN;
	dev->addr_len		= ETH_ALEN;
	dev->tx_queue_len	= 1000;	/* Ethernet wants good queues */
	dev->flags		= IFF_BROADCAST|IFF_MULTICAST;
	dev->priv_flags		|= IFF_TX_SKB_SHARING;

	memset(dev->broadcast, 0xFF, ETH_ALEN);

}
EXPORT_SYMBOL(ether_setup);

/**
 * alloc_etherdev_mqs - Allocates and sets up an Ethernet device
 * @sizeof_priv: Size of additional driver-private structure to be allocated
 *	for this Ethernet device
 * @txqs: The number of TX queues this device has.
 * @rxqs: The number of RX queues this device has.
 *
 * Fill in the fields of the device structure with Ethernet-generic
 * values. Basically does everything except registering the device.
 *
 * Constructs a new net device, complete with a private data area of
 * size (sizeof_priv).  A 32-byte (not bit) alignment is enforced for
 * this private data area.
 */

struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
				      unsigned int rxqs)
{
	return alloc_netdev_mqs(sizeof_priv, "eth%d", NET_NAME_UNKNOWN,
				ether_setup, txqs, rxqs);
}
EXPORT_SYMBOL(alloc_etherdev_mqs);

ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len)
{
	return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr);
}
EXPORT_SYMBOL(sysfs_format_mac);
Commit	Line	Data
	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* Ethernet-type device handling.
	7	*
	8	* Version: @(#)eth.c 1.0.7 05/25/93
	9	*
	10	* Authors: Ross Biro
	11	* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
	12	* Mark Evans, <evansmp@uhura.aston.ac.uk>
	13	* Florian La Roche, <rzsfl@rz.uni-sb.de>
	14	* Alan Cox, <gw4pts@gw4pts.ampr.org>
	15	*
	16	* Fixes:
	17	* Mr Linux : Arp problems
	18	* Alan Cox : Generic queue tidyup (very tiny here)
	19	* Alan Cox : eth_header ntohs should be htons
	20	* Alan Cox : eth_rebuild_header missing an htons and
	21	* minor other things.
	22	* Tegge : Arp bug fixes.
	23	* Florian : Removed many unnecessary functions, code cleanup
	24	* and changes for new arp and skbuff.
	25	* Alan Cox : Redid header building to reflect new format.
	26	* Alan Cox : ARP only when compiled with CONFIG_INET
	27	* Greg Page : 802.2 and SNAP stuff.
	28	* Alan Cox : MAC layer pointers/new format.
	29	* Paul Gortmaker : eth_copy_and_sum shouldn't csum padding.
	30	* Alan Cox : Protect against forwarding explosions with
	31	* older network drivers and IFF_ALLMULTI.
	32	* Christer Weinigel : Better rebuild header message.
	33	* Andrew Morton : 26Feb01: kill ether_setup() - use netdev_boot_setup().
	34	*
	35	* This program is free software; you can redistribute it and/or
	36	* modify it under the terms of the GNU General Public License
	37	* as published by the Free Software Foundation; either version
	38	* 2 of the License, or (at your option) any later version.
	39	*/
	40	#include <linux/module.h>
	41	#include <linux/types.h>
	42	#include <linux/kernel.h>
	43	#include <linux/string.h>
	44	#include <linux/mm.h>
	45	#include <linux/socket.h>
	46	#include <linux/in.h>
	47	#include <linux/inet.h>
	48	#include <linux/ip.h>
	49	#include <linux/netdevice.h>
	50	#include <linux/etherdevice.h>
	51	#include <linux/skbuff.h>
	52	#include <linux/errno.h>
	53	#include <linux/init.h>
	54	#include <linux/if_ether.h>
	55	#include <net/dst.h>
	56	#include <net/arp.h>
	57	#include <net/sock.h>
	58	#include <net/ipv6.h>
	59	#include <net/ip.h>
	60	#include <net/dsa.h>
	61	#include <linux/uaccess.h>
	62
	63	__setup("ether=", netdev_boot_setup);
	64
	65	/**
	66	* eth_header - create the Ethernet header
	67	* @skb: buffer to alter
	68	* @dev: source device
	69	* @type: Ethernet type field
	70	* @daddr: destination address (NULL leave destination address)
	71	* @saddr: source address (NULL use device source address)
	72	* @len: packet length (<= skb->len)
	73	*
	74	*
	75	* Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length
	76	* in here instead.
	77	*/
	78	int eth_header(struct sk_buff skb, struct net_device dev,
	79	unsigned short type,
	80	const void daddr, const void saddr, unsigned int len)
	81	{
	82	struct ethhdr eth = (struct ethhdr )skb_push(skb, ETH_HLEN);
	83
	84	if (type != ETH_P_802_3 && type != ETH_P_802_2)
	85	eth->h_proto = htons(type);
	86	else
	87	eth->h_proto = htons(len);
	88
	89	/*
	90	* Set the source hardware address.
	91	*/
	92
	93	if (!saddr)
	94	saddr = dev->dev_addr;
	95	memcpy(eth->h_source, saddr, ETH_ALEN);
	96
	97	if (daddr) {
	98	memcpy(eth->h_dest, daddr, ETH_ALEN);
	99	return ETH_HLEN;
	100	}
	101
	102	/*
	103	* Anyway, the loopback-device should never use this function...
	104	*/
	105
	106	if (dev->flags & (IFF_LOOPBACK \| IFF_NOARP)) {
	107	memset(eth->h_dest, 0, ETH_ALEN);
	108	return ETH_HLEN;
	109	}
	110
	111	return -ETH_HLEN;
	112	}
	113	EXPORT_SYMBOL(eth_header);
	114
	115	/**
	116	* eth_rebuild_header- rebuild the Ethernet MAC header.
	117	* @skb: socket buffer to update
	118	*
	119	* This is called after an ARP or IPV6 ndisc it's resolution on this
	120	* sk_buff. We now let protocol (ARP) fill in the other fields.
	121	*
	122	* This routine CANNOT use cached dst->neigh!
	123	* Really, it is used only when dst->neigh is wrong.
	124	*/
	125	int eth_rebuild_header(struct sk_buff *skb)
	126	{
	127	struct ethhdr eth = (struct ethhdr )skb->data;
	128	struct net_device *dev = skb->dev;
	129
	130	switch (eth->h_proto) {
	131	#ifdef CONFIG_INET
	132	case htons(ETH_P_IP):
	133	return arp_find(eth->h_dest, skb);
	134	#endif
	135	default:
	136	netdev_dbg(dev,
	137	"%s: unable to resolve type %X addresses.\n",
	138	dev->name, ntohs(eth->h_proto));
	139
	140	memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
	141	break;
	142	}
	143
	144	return 0;
	145	}
	146	EXPORT_SYMBOL(eth_rebuild_header);
	147
	148	/**
	149	* eth_type_trans - determine the packet's protocol ID.
	150	* @skb: received socket data
	151	* @dev: receiving network device
	152	*
	153	* The rule here is that we
	154	* assume 802.3 if the type field is short enough to be a length.
	155	* This is normal practice and works for any 'now in use' protocol.
	156	*/
	157	__be16 eth_type_trans(struct sk_buff skb, struct net_device dev)
	158	{
	159	unsigned short _service_access_point;
	160	const unsigned short *sap;
	161	const struct ethhdr *eth;
	162
	163	skb->dev = dev;
	164	skb_reset_mac_header(skb);
	165	skb_pull_inline(skb, ETH_HLEN);
	166	eth = eth_hdr(skb);
	167
	168	if (unlikely(is_multicast_ether_addr(eth->h_dest))) {
	169	if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
	170	skb->pkt_type = PACKET_BROADCAST;
	171	else
	172	skb->pkt_type = PACKET_MULTICAST;
	173	}
	174	else if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
	175	dev->dev_addr)))
	176	skb->pkt_type = PACKET_OTHERHOST;
	177
	178	/*
	179	* Some variants of DSA tagging don't have an ethertype field
	180	* at all, so we check here whether one of those tagging
	181	* variants has been configured on the receiving interface,
	182	* and if so, set skb->protocol without looking at the packet.
	183	*/
	184	if (unlikely(netdev_uses_dsa(dev)))
	185	return htons(ETH_P_XDSA);
	186
	187	if (likely(ntohs(eth->h_proto) >= ETH_P_802_3_MIN))
	188	return eth->h_proto;
	189
	190	/*
	191	* This is a magic hack to spot IPX packets. Older Novell breaks
	192	* the protocol design and runs IPX over 802.3 without an 802.2 LLC
	193	* layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
	194	* won't work for fault tolerant netware but does for the rest.
	195	*/
	196	sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point);
	197	if (sap && *sap == 0xFFFF)
	198	return htons(ETH_P_802_3);
	199
	200	/*
	201	* Real 802.2 LLC
	202	*/
	203	return htons(ETH_P_802_2);
	204	}
	205	EXPORT_SYMBOL(eth_type_trans);
	206
	207	/**
	208	* eth_header_parse - extract hardware address from packet
	209	* @skb: packet to extract header from
	210	* @haddr: destination buffer
	211	*/
	212	int eth_header_parse(const struct sk_buff skb, unsigned char haddr)
	213	{
	214	const struct ethhdr *eth = eth_hdr(skb);
	215	memcpy(haddr, eth->h_source, ETH_ALEN);
	216	return ETH_ALEN;
	217	}
	218	EXPORT_SYMBOL(eth_header_parse);
	219
	220	/**
	221	* eth_header_cache - fill cache entry from neighbour
	222	* @neigh: source neighbour
	223	* @hh: destination cache entry
	224	* @type: Ethernet type field
	225	*
	226	* Create an Ethernet header template from the neighbour.
	227	*/
	228	int eth_header_cache(const struct neighbour neigh, struct hh_cache hh, __be16 type)
	229	{
	230	struct ethhdr *eth;
	231	const struct net_device *dev = neigh->dev;
	232
	233	eth = (struct ethhdr *)
	234	(((u8 ) hh->hh_data) + (HH_DATA_OFF(sizeof(eth))));
	235
	236	if (type == htons(ETH_P_802_3))
	237	return -1;
	238
	239	eth->h_proto = type;
	240	memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
	241	memcpy(eth->h_dest, neigh->ha, ETH_ALEN);
	242	hh->hh_len = ETH_HLEN;
	243	return 0;
	244	}
	245	EXPORT_SYMBOL(eth_header_cache);
	246
	247	/**
	248	* eth_header_cache_update - update cache entry
	249	* @hh: destination cache entry
	250	* @dev: network device
	251	* @haddr: new hardware address
	252	*
	253	* Called by Address Resolution module to notify changes in address.
	254	*/
	255	void eth_header_cache_update(struct hh_cache *hh,
	256	const struct net_device *dev,
	257	const unsigned char *haddr)
	258	{
	259	memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
	260	haddr, ETH_ALEN);
	261	}
	262	EXPORT_SYMBOL(eth_header_cache_update);
	263
	264	/**
	265	* eth_prepare_mac_addr_change - prepare for mac change
	266	* @dev: network device
	267	* @p: socket address
	268	*/
	269	int eth_prepare_mac_addr_change(struct net_device dev, void p)
	270	{
	271	struct sockaddr *addr = p;
	272
	273	if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
	274	return -EBUSY;
	275	if (!is_valid_ether_addr(addr->sa_data))
	276	return -EADDRNOTAVAIL;
	277	return 0;
	278	}
	279	EXPORT_SYMBOL(eth_prepare_mac_addr_change);
	280
	281	/**
	282	* eth_commit_mac_addr_change - commit mac change
	283	* @dev: network device
	284	* @p: socket address
	285	*/
	286	void eth_commit_mac_addr_change(struct net_device dev, void p)
	287	{
	288	struct sockaddr *addr = p;
	289
	290	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
	291	}
	292	EXPORT_SYMBOL(eth_commit_mac_addr_change);
	293
	294	/**
	295	* eth_mac_addr - set new Ethernet hardware address
	296	* @dev: network device
	297	* @p: socket address
	298	*
	299	* Change hardware address of device.
	300	*
	301	* This doesn't change hardware matching, so needs to be overridden
	302	* for most real devices.
	303	*/
	304	int eth_mac_addr(struct net_device dev, void p)
	305	{
	306	int ret;
	307
	308	ret = eth_prepare_mac_addr_change(dev, p);
	309	if (ret < 0)
	310	return ret;
	311	eth_commit_mac_addr_change(dev, p);
	312	return 0;
	313	}
	314	EXPORT_SYMBOL(eth_mac_addr);
	315
	316	/**
	317	* eth_change_mtu - set new MTU size
	318	* @dev: network device
	319	* @new_mtu: new Maximum Transfer Unit
	320	*
	321	* Allow changing MTU size. Needs to be overridden for devices
	322	* supporting jumbo frames.
	323	*/
	324	int eth_change_mtu(struct net_device *dev, int new_mtu)
	325	{
	326	if (new_mtu < 68 \|\| new_mtu > ETH_DATA_LEN)
	327	return -EINVAL;
	328	dev->mtu = new_mtu;
	329	return 0;
	330	}
	331	EXPORT_SYMBOL(eth_change_mtu);
	332
	333	int eth_validate_addr(struct net_device *dev)
	334	{
	335	if (!is_valid_ether_addr(dev->dev_addr))
	336	return -EADDRNOTAVAIL;
	337
	338	return 0;
	339	}
	340	EXPORT_SYMBOL(eth_validate_addr);
	341
	342	const struct header_ops eth_header_ops ____cacheline_aligned = {
	343	.create = eth_header,
	344	.parse = eth_header_parse,
	345	.rebuild = eth_rebuild_header,
	346	.cache = eth_header_cache,
	347	.cache_update = eth_header_cache_update,
	348	};
	349
	350	/**
	351	* ether_setup - setup Ethernet network device
	352	* @dev: network device
	353	*
	354	* Fill in the fields of the device structure with Ethernet-generic values.
	355	*/
	356	void ether_setup(struct net_device *dev)
	357	{
	358	dev->header_ops = &eth_header_ops;
	359	dev->type = ARPHRD_ETHER;
	360	dev->hard_header_len = ETH_HLEN;
	361	dev->mtu = ETH_DATA_LEN;
	362	dev->addr_len = ETH_ALEN;
	363	dev->tx_queue_len = 1000; /* Ethernet wants good queues */
	364	dev->flags = IFF_BROADCAST\|IFF_MULTICAST;
	365	dev->priv_flags \|= IFF_TX_SKB_SHARING;
	366
	367	memset(dev->broadcast, 0xFF, ETH_ALEN);
	368
	369	}
	370	EXPORT_SYMBOL(ether_setup);
	371
	372	/**
	373	* alloc_etherdev_mqs - Allocates and sets up an Ethernet device
	374	* @sizeof_priv: Size of additional driver-private structure to be allocated
	375	* for this Ethernet device
	376	* @txqs: The number of TX queues this device has.
	377	* @rxqs: The number of RX queues this device has.
	378	*
	379	* Fill in the fields of the device structure with Ethernet-generic
	380	* values. Basically does everything except registering the device.
	381	*
	382	* Constructs a new net device, complete with a private data area of
	383	* size (sizeof_priv). A 32-byte (not bit) alignment is enforced for
	384	* this private data area.
	385	*/
	386
	387	struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
	388	unsigned int rxqs)
	389	{
	390	return alloc_netdev_mqs(sizeof_priv, "eth%d", NET_NAME_UNKNOWN,
	391	ether_setup, txqs, rxqs);
	392	}
	393	EXPORT_SYMBOL(alloc_etherdev_mqs);
	394
	395	ssize_t sysfs_format_mac(char buf, const unsigned char addr, int len)
	396	{
	397	return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr);
	398	}
	399	EXPORT_SYMBOL(sysfs_format_mac);