[mirror_ubuntu-artful-kernel.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 <asm/uaccess.h>
#include <asm/system.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 we put the length
 * in here instead. It is up to the 802.2 layer to carry protocol information.
 */
int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
	       void *daddr, void *saddr, unsigned len)
{
	struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN);

	if (type != ETH_P_802_3)
		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;
}

/**
 * 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 __constant_htons(ETH_P_IP):
		return arp_find(eth->h_dest, skb);
#endif
	default:
		printk(KERN_DEBUG
		       "%s: unable to resolve type %X addresses.\n",
		       dev->name, (int)eth->h_proto);

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

	return 0;
}

/**
 * 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)
{
	struct ethhdr *eth;
	unsigned char *rawp;

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

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

	/*
	 *      This ALLMULTI check should be redundant by 1.4
	 *      so don't forget to remove it.
	 *
	 *      Seems, you forgot to remove it. All silly devices
	 *      seems to set IFF_PROMISC.
	 */

	else if (1 /*dev->flags&IFF_PROMISC */ ) {
		if (unlikely(compare_ether_addr(eth->h_dest, dev->dev_addr)))
			skb->pkt_type = PACKET_OTHERHOST;
	}

	if (ntohs(eth->h_proto) >= 1536)
		return eth->h_proto;

	rawp = skb->data;

	/*
	 *      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.
	 */
	if (*(unsigned short *)rawp == 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
 */
static 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;
}

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

/**
 * 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, struct net_device *dev,
			     unsigned char *haddr)
{
	memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
	       haddr, ETH_ALEN);
}

/**
 * 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.
 */
static int eth_mac_addr(struct net_device *dev, void *p)
{
	struct sockaddr *addr = p;

	if (netif_running(dev))
		return -EBUSY;
	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;
	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
	return 0;
}

/**
 * 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.
 */
static 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;
}

/**
 * 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->change_mtu		= eth_change_mtu;
	dev->hard_header	= eth_header;
	dev->rebuild_header 	= eth_rebuild_header;
	dev->set_mac_address 	= eth_mac_addr;
	dev->hard_header_cache	= eth_header_cache;
	dev->header_cache_update= eth_header_cache_update;
	dev->hard_header_parse	= eth_header_parse;

	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;

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

}
EXPORT_SYMBOL(ether_setup);

/**
 * alloc_etherdev_mq - Allocates and sets up an Ethernet device
 * @sizeof_priv: Size of additional driver-private structure to be allocated
 *	for this Ethernet device
 * @queue_count: The number of 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_mq(int sizeof_priv, unsigned int queue_count)
{
	return alloc_netdev_mq(sizeof_priv, "eth%d", ether_setup, queue_count);
}
EXPORT_SYMBOL(alloc_etherdev_mq);

char *print_mac(char *buf, const u8 *addr)
{
	sprintf(buf, MAC_FMT,
		addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
	return buf;
}
EXPORT_SYMBOL(print_mac);
Commit	Line	Data
1da177e4 LT	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	*
02c30a84	10	* Authors: Ross Biro
1da177e4 LT	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>
03d52d7c	15	*
1da177e4 LT	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.
03d52d7c	22	* Tegge : Arp bug fixes.
1da177e4 LT	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>
1da177e4 LT	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>
1da177e4	53	#include <linux/init.h>
46f25dff	54	#include <linux/if_ether.h>
1da177e4 LT	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 <asm/uaccess.h>
	61	#include <asm/system.h>
1da177e4	62
1da177e4 LT	63	__setup("ether=", netdev_boot_setup);
1da177e4 LT	64
d3e01f71 SH	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)
1da177e4	73	*
d3e01f71 SH	74	*
	75	* Set the protocol type. For a packet of type ETH_P_802_3 we put the length
	76	* in here instead. It is up to the 802.2 layer to carry protocol information.
1da177e4	77	*/
1da177e4	78	int eth_header(struct sk_buff skb, struct net_device dev, unsigned short type,
2e4ca75b	79	void daddr, void saddr, unsigned len)
1da177e4	80	{
2e4ca75b	81	struct ethhdr eth = (struct ethhdr )skb_push(skb, ETH_HLEN);
1da177e4	82
2e4ca75b	83	if (type != ETH_P_802_3)
1da177e4 LT	84	eth->h_proto = htons(type);
	85	else
	86	eth->h_proto = htons(len);
	87
	88	/*
2e4ca75b	89	* Set the source hardware address.
1da177e4	90	*/
2e4ca75b SH	91
2e4ca75b SH	92	if (!saddr)
ff593c59	93	saddr = dev->dev_addr;
23f1f4ef	94	memcpy(eth->h_source, saddr, ETH_ALEN);
1da177e4	95
2e4ca75b	96	if (daddr) {
23f1f4ef	97	memcpy(eth->h_dest, daddr, ETH_ALEN);
f8d0e3f1 JHS	98	return ETH_HLEN;
f8d0e3f1 JHS	99	}
2e4ca75b	100
1da177e4	101	/*
2e4ca75b	102	* Anyway, the loopback-device should never use this function...
1da177e4 LT	103	*/
1da177e4 LT	104
2e4ca75b	105	if (dev->flags & (IFF_LOOPBACK \| IFF_NOARP)) {
23f1f4ef	106	memset(eth->h_dest, 0, ETH_ALEN);
1da177e4 LT	107	return ETH_HLEN;
1da177e4 LT	108	}
2e4ca75b	109
1da177e4 LT	110	return -ETH_HLEN;
	111	}
	112
d3e01f71 SH	113	/**
	114	* eth_rebuild_header- rebuild the Ethernet MAC header.
	115	* @skb: socket buffer to update
	116	*
	117	* This is called after an ARP or IPV6 ndisc it's resolution on this
	118	* sk_buff. We now let protocol (ARP) fill in the other fields.
1da177e4	119	*
d3e01f71 SH	120	* This routine CANNOT use cached dst->neigh!
d3e01f71 SH	121	* Really, it is used only when dst->neigh is wrong.
1da177e4	122	*/
1da177e4 LT	123	int eth_rebuild_header(struct sk_buff *skb)
	124	{
	125	struct ethhdr eth = (struct ethhdr )skb->data;
	126	struct net_device *dev = skb->dev;
	127
2e4ca75b	128	switch (eth->h_proto) {
1da177e4 LT	129	#ifdef CONFIG_INET
1da177e4 LT	130	case __constant_htons(ETH_P_IP):
2e4ca75b SH	131	return arp_find(eth->h_dest, skb);
2e4ca75b SH	132	#endif
1da177e4 LT	133	default:
1da177e4 LT	134	printk(KERN_DEBUG
2e4ca75b	135	"%s: unable to resolve type %X addresses.\n",
1da177e4	136	dev->name, (int)eth->h_proto);
2e4ca75b	137
23f1f4ef	138	memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
1da177e4 LT	139	break;
	140	}
	141
	142	return 0;
	143	}
	144
d3e01f71 SH	145	/**
	146	* eth_type_trans - determine the packet's protocol ID.
	147	* @skb: received socket data
	148	* @dev: receiving network device
	149	*
	150	* The rule here is that we
	151	* assume 802.3 if the type field is short enough to be a length.
	152	* This is normal practice and works for any 'now in use' protocol.
1da177e4	153	*/
ab611487	154	__be16 eth_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4 LT	155	{
	156	struct ethhdr *eth;
	157	unsigned char *rawp;
2e4ca75b	158
4c13eb66	159	skb->dev = dev;
459a98ed	160	skb_reset_mac_header(skb);
2e4ca75b	161	skb_pull(skb, ETH_HLEN);
1da177e4	162	eth = eth_hdr(skb);
2e4ca75b	163
dbbc0988	164	if (is_multicast_ether_addr(eth->h_dest)) {
360ac8e2	165	if (!compare_ether_addr(eth->h_dest, dev->broadcast))
ba645c16	166	skb->pkt_type = PACKET_BROADCAST;
1da177e4	167	else
ba645c16	168	skb->pkt_type = PACKET_MULTICAST;
1da177e4	169	}
2e4ca75b	170
1da177e4	171	/*
2e4ca75b SH	172	* This ALLMULTI check should be redundant by 1.4
2e4ca75b SH	173	* so don't forget to remove it.
1da177e4	174	*
2e4ca75b SH	175	* Seems, you forgot to remove it. All silly devices
2e4ca75b SH	176	* seems to set IFF_PROMISC.
1da177e4	177	*/
2e4ca75b SH	178
2e4ca75b SH	179	else if (1 /dev->flags&IFF_PROMISC / ) {
360ac8e2	180	if (unlikely(compare_ether_addr(eth->h_dest, dev->dev_addr)))
ba645c16	181	skb->pkt_type = PACKET_OTHERHOST;
1da177e4	182	}
2e4ca75b	183
1da177e4 LT	184	if (ntohs(eth->h_proto) >= 1536)
1da177e4 LT	185	return eth->h_proto;
2e4ca75b	186
1da177e4	187	rawp = skb->data;
2e4ca75b	188
1da177e4	189	/*
2e4ca75b SH	190	* This is a magic hack to spot IPX packets. Older Novell breaks
	191	* the protocol design and runs IPX over 802.3 without an 802.2 LLC
	192	* layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
	193	* won't work for fault tolerant netware but does for the rest.
1da177e4 LT	194	*/
	195	if ((unsigned short )rawp == 0xFFFF)
	196	return htons(ETH_P_802_3);
2e4ca75b	197
1da177e4	198	/*
2e4ca75b	199	* Real 802.2 LLC
1da177e4 LT	200	*/
	201	return htons(ETH_P_802_2);
	202	}
2e4ca75b	203	EXPORT_SYMBOL(eth_type_trans);
1da177e4	204
d3e01f71 SH	205	/**
	206	* eth_header_parse - extract hardware address from packet
	207	* @skb: packet to extract header from
	208	* @haddr: destination buffer
	209	*/
b95cce35	210	static int eth_header_parse(const struct sk_buff skb, unsigned char haddr)
1da177e4	211	{
b95cce35	212	const struct ethhdr *eth = eth_hdr(skb);
1da177e4 LT	213	memcpy(haddr, eth->h_source, ETH_ALEN);
	214	return ETH_ALEN;
	215	}
	216
d3e01f71 SH	217	/**
	218	* eth_header_cache - fill cache entry from neighbour
	219	* @neigh: source neighbour
	220	* @hh: destination cache entry
	221	* Create an Ethernet header template from the neighbour.
	222	*/
1da177e4 LT	223	int eth_header_cache(struct neighbour neigh, struct hh_cache hh)
1da177e4 LT	224	{
d77072ec	225	__be16 type = hh->hh_type;
1da177e4 LT	226	struct ethhdr *eth;
	227	struct net_device *dev = neigh->dev;
	228
2e4ca75b SH	229	eth = (struct ethhdr *)
2e4ca75b SH	230	(((u8 ) hh->hh_data) + (HH_DATA_OFF(sizeof(eth))));
1da177e4	231
f576e24f	232	if (type == htons(ETH_P_802_3))
1da177e4 LT	233	return -1;
	234
	235	eth->h_proto = type;
23f1f4ef SH	236	memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
23f1f4ef SH	237	memcpy(eth->h_dest, neigh->ha, ETH_ALEN);
1da177e4 LT	238	hh->hh_len = ETH_HLEN;
	239	return 0;
	240	}
	241
d3e01f71 SH	242	/**
	243	* eth_header_cache_update - update cache entry
	244	* @hh: destination cache entry
	245	* @dev: network device
	246	* @haddr: new hardware address
	247	*
1da177e4 LT	248	* Called by Address Resolution module to notify changes in address.
1da177e4 LT	249	*/
2e4ca75b SH	250	void eth_header_cache_update(struct hh_cache hh, struct net_device dev,
2e4ca75b SH	251	unsigned char *haddr)
1da177e4	252	{
2e4ca75b	253	memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
23f1f4ef	254	haddr, ETH_ALEN);
1da177e4 LT	255	}
1da177e4 LT	256
d3e01f71 SH	257	/**
	258	* eth_mac_addr - set new Ethernet hardware address
	259	* @dev: network device
	260	* @p: socket address
	261	* Change hardware address of device.
	262	*
	263	* This doesn't change hardware matching, so needs to be overridden
	264	* for most real devices.
	265	*/
1da177e4 LT	266	static int eth_mac_addr(struct net_device dev, void p)
1da177e4 LT	267	{
2e4ca75b	268	struct sockaddr *addr = p;
71bffe55	269
1da177e4 LT	270	if (netif_running(dev))
1da177e4 LT	271	return -EBUSY;
71bffe55 PM	272	if (!is_valid_ether_addr(addr->sa_data))
71bffe55 PM	273	return -EADDRNOTAVAIL;
23f1f4ef	274	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
1da177e4 LT	275	return 0;
	276	}
	277
d3e01f71 SH	278	/**
	279	* eth_change_mtu - set new MTU size
	280	* @dev: network device
	281	* @new_mtu: new Maximum Transfer Unit
	282	*
	283	* Allow changing MTU size. Needs to be overridden for devices
	284	* supporting jumbo frames.
	285	*/
1da177e4 LT	286	static int eth_change_mtu(struct net_device *dev, int new_mtu)
1da177e4 LT	287	{
46f25dff	288	if (new_mtu < 68 \|\| new_mtu > ETH_DATA_LEN)
1da177e4 LT	289	return -EINVAL;
	290	dev->mtu = new_mtu;
	291	return 0;
	292	}
	293
d3e01f71 SH	294	/**
	295	* ether_setup - setup Ethernet network device
	296	* @dev: network device
	297	* Fill in the fields of the device structure with Ethernet-generic values.
1da177e4 LT	298	*/
	299	void ether_setup(struct net_device *dev)
	300	{
	301	dev->change_mtu = eth_change_mtu;
	302	dev->hard_header = eth_header;
	303	dev->rebuild_header = eth_rebuild_header;
	304	dev->set_mac_address = eth_mac_addr;
	305	dev->hard_header_cache = eth_header_cache;
	306	dev->header_cache_update= eth_header_cache_update;
	307	dev->hard_header_parse = eth_header_parse;
	308
	309	dev->type = ARPHRD_ETHER;
	310	dev->hard_header_len = ETH_HLEN;
46f25dff	311	dev->mtu = ETH_DATA_LEN;
1da177e4	312	dev->addr_len = ETH_ALEN;
03d52d7c	313	dev->tx_queue_len = 1000; /* Ethernet wants good queues */
1da177e4	314	dev->flags = IFF_BROADCAST\|IFF_MULTICAST;
03d52d7c	315
2e4ca75b	316	memset(dev->broadcast, 0xFF, ETH_ALEN);
1da177e4 LT	317
	318	}
	319	EXPORT_SYMBOL(ether_setup);
	320
	321	/**
f25f4e44	322	* alloc_etherdev_mq - Allocates and sets up an Ethernet device
1da177e4	323	* @sizeof_priv: Size of additional driver-private structure to be allocated
d3e01f71	324	* for this Ethernet device
f25f4e44	325	* @queue_count: The number of queues this device has.
1da177e4	326	*
d3e01f71	327	* Fill in the fields of the device structure with Ethernet-generic
1da177e4 LT	328	* values. Basically does everything except registering the device.
	329	*
	330	* Constructs a new net device, complete with a private data area of
d3e01f71	331	* size (sizeof_priv). A 32-byte (not bit) alignment is enforced for
1da177e4 LT	332	* this private data area.
	333	*/
	334
f25f4e44	335	struct net_device *alloc_etherdev_mq(int sizeof_priv, unsigned int queue_count)
1da177e4	336	{
f25f4e44	337	return alloc_netdev_mq(sizeof_priv, "eth%d", ether_setup, queue_count);
1da177e4	338	}
f25f4e44	339	EXPORT_SYMBOL(alloc_etherdev_mq);
0795af57 JP	340
	341	char print_mac(char buf, const u8 *addr)
	342	{
	343	sprintf(buf, MAC_FMT,
	344	addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
	345	return buf;
	346	}
	347	EXPORT_SYMBOL(print_mac);