[mirror_ubuntu-jammy-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/sched.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>
#include <asm/checksum.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,dev->addr_len);

	if(daddr)
	{
		memcpy(eth->h_dest,daddr,dev->addr_len);
		return ETH_HLEN;
	}
	
	/*
	 *	Anyway, the loopback-device should never use this function... 
	 */

	if (dev->flags & (IFF_LOOPBACK|IFF_NOARP)) 
	{
		memset(eth->h_dest, 0, dev->addr_len);
		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, dev->addr_len);
		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->mac.raw = skb->data;
	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);
}

/**
 * eth_header_parse - extract hardware address from packet
 * @skb: packet to extract header from
 * @haddr: destination buffer
 */
static int eth_header_parse(struct sk_buff *skb, unsigned char *haddr)
{
	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)
{
	unsigned short 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 == __constant_htons(ETH_P_802_3))
		return -1;

	eth->h_proto = type;
	memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
	memcpy(eth->h_dest, neigh->ha, dev->addr_len);
	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, dev->addr_len);
}

EXPORT_SYMBOL(eth_type_trans);

/**
 * 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;
	memcpy(dev->dev_addr, addr->sa_data,dev->addr_len);
	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 - Allocates and sets up an Ethernet device
 * @sizeof_priv: Size of additional driver-private structure to be allocated
 *	for this Ethernet device
 *
 * 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(int sizeof_priv)
{
	return alloc_netdev(sizeof_priv, "eth%d", ether_setup);
}
EXPORT_SYMBOL(alloc_etherdev);
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>
	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/sched.h>
	44	#include <linux/string.h>
	45	#include <linux/mm.h>
	46	#include <linux/socket.h>
	47	#include <linux/in.h>
	48	#include <linux/inet.h>
	49	#include <linux/ip.h>
	50	#include <linux/netdevice.h>
	51	#include <linux/etherdevice.h>
	52	#include <linux/skbuff.h>
	53	#include <linux/errno.h>
1da177e4	54	#include <linux/init.h>
46f25dff	55	#include <linux/if_ether.h>
1da177e4 LT	56	#include <net/dst.h>
	57	#include <net/arp.h>
	58	#include <net/sock.h>
	59	#include <net/ipv6.h>
	60	#include <net/ip.h>
	61	#include <asm/uaccess.h>
	62	#include <asm/system.h>
	63	#include <asm/checksum.h>
	64
1da177e4 LT	65	__setup("ether=", netdev_boot_setup);
1da177e4 LT	66
d3e01f71 SH	67	/**
	68	* eth_header - create the Ethernet header
	69	* @skb: buffer to alter
	70	* @dev: source device
	71	* @type: Ethernet type field
	72	* @daddr: destination address (NULL leave destination address)
	73	* @saddr: source address (NULL use device source address)
	74	* @len: packet length (<= skb->len)
1da177e4	75	*
d3e01f71 SH	76	*
	77	* Set the protocol type. For a packet of type ETH_P_802_3 we put the length
	78	* in here instead. It is up to the 802.2 layer to carry protocol information.
1da177e4	79	*/
1da177e4 LT	80	int eth_header(struct sk_buff skb, struct net_device dev, unsigned short type,
	81	void daddr, void saddr, unsigned len)
	82	{
	83	struct ethhdr eth = (struct ethhdr )skb_push(skb,ETH_HLEN);
	84
1da177e4 LT	85	if(type!=ETH_P_802_3)
	86	eth->h_proto = htons(type);
	87	else
	88	eth->h_proto = htons(len);
	89
	90	/*
	91	* Set the source hardware address.
	92	*/
	93
ff593c59 DV	94	if(!saddr)
	95	saddr = dev->dev_addr;
	96	memcpy(eth->h_source,saddr,dev->addr_len);
1da177e4	97
f8d0e3f1 JHS	98	if(daddr)
	99	{
	100	memcpy(eth->h_dest,daddr,dev->addr_len);
	101	return ETH_HLEN;
	102	}
	103
1da177e4 LT	104	/*
	105	* Anyway, the loopback-device should never use this function...
	106	*/
	107
	108	if (dev->flags & (IFF_LOOPBACK\|IFF_NOARP))
	109	{
	110	memset(eth->h_dest, 0, dev->addr_len);
	111	return ETH_HLEN;
	112	}
	113
1da177e4 LT	114	return -ETH_HLEN;
	115	}
	116
d3e01f71 SH	117	/**
	118	* eth_rebuild_header- rebuild the Ethernet MAC header.
	119	* @skb: socket buffer to update
	120	*
	121	* This is called after an ARP or IPV6 ndisc it's resolution on this
	122	* sk_buff. We now let protocol (ARP) fill in the other fields.
1da177e4	123	*
d3e01f71 SH	124	* This routine CANNOT use cached dst->neigh!
d3e01f71 SH	125	* Really, it is used only when dst->neigh is wrong.
1da177e4	126	*/
1da177e4 LT	127	int eth_rebuild_header(struct sk_buff *skb)
	128	{
	129	struct ethhdr eth = (struct ethhdr )skb->data;
	130	struct net_device *dev = skb->dev;
	131
	132	switch (eth->h_proto)
	133	{
	134	#ifdef CONFIG_INET
	135	case __constant_htons(ETH_P_IP):
	136	return arp_find(eth->h_dest, skb);
	137	#endif
	138	default:
	139	printk(KERN_DEBUG
	140	"%s: unable to resolve type %X addresses.\n",
	141	dev->name, (int)eth->h_proto);
	142
	143	memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
	144	break;
	145	}
	146
	147	return 0;
	148	}
	149
	150
d3e01f71 SH	151	/**
	152	* eth_type_trans - determine the packet's protocol ID.
	153	* @skb: received socket data
	154	* @dev: receiving network device
	155	*
	156	* The rule here is that we
	157	* assume 802.3 if the type field is short enough to be a length.
	158	* This is normal practice and works for any 'now in use' protocol.
1da177e4	159	*/
ab611487	160	__be16 eth_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4 LT	161	{
	162	struct ethhdr *eth;
	163	unsigned char *rawp;
	164
ba645c16	165	skb->mac.raw = skb->data;
1da177e4 LT	166	skb_pull(skb,ETH_HLEN);
1da177e4 LT	167	eth = eth_hdr(skb);
1da177e4	168
dbbc0988	169	if (is_multicast_ether_addr(eth->h_dest)) {
360ac8e2	170	if (!compare_ether_addr(eth->h_dest, dev->broadcast))
ba645c16	171	skb->pkt_type = PACKET_BROADCAST;
1da177e4	172	else
ba645c16	173	skb->pkt_type = PACKET_MULTICAST;
1da177e4 LT	174	}
	175
	176	/*
	177	* This ALLMULTI check should be redundant by 1.4
	178	* so don't forget to remove it.
	179	*
	180	* Seems, you forgot to remove it. All silly devices
	181	* seems to set IFF_PROMISC.
	182	*/
	183
ba645c16	184	else if(1 /dev->flags&IFF_PROMISC/) {
360ac8e2	185	if (unlikely(compare_ether_addr(eth->h_dest, dev->dev_addr)))
ba645c16	186	skb->pkt_type = PACKET_OTHERHOST;
1da177e4 LT	187	}
	188
	189	if (ntohs(eth->h_proto) >= 1536)
	190	return eth->h_proto;
	191
	192	rawp = skb->data;
	193
	194	/*
	195	* This is a magic hack to spot IPX packets. Older Novell breaks
	196	* the protocol design and runs IPX over 802.3 without an 802.2 LLC
	197	* layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
	198	* won't work for fault tolerant netware but does for the rest.
	199	*/
	200	if ((unsigned short )rawp == 0xFFFF)
	201	return htons(ETH_P_802_3);
	202
	203	/*
	204	* Real 802.2 LLC
	205	*/
	206	return htons(ETH_P_802_2);
	207	}
	208
d3e01f71 SH	209	/**
	210	* eth_header_parse - extract hardware address from packet
	211	* @skb: packet to extract header from
	212	* @haddr: destination buffer
	213	*/
1da177e4 LT	214	static int eth_header_parse(struct sk_buff skb, unsigned char haddr)
	215	{
	216	struct ethhdr *eth = eth_hdr(skb);
	217	memcpy(haddr, eth->h_source, ETH_ALEN);
	218	return ETH_ALEN;
	219	}
	220
d3e01f71 SH	221	/**
	222	* eth_header_cache - fill cache entry from neighbour
	223	* @neigh: source neighbour
	224	* @hh: destination cache entry
	225	* Create an Ethernet header template from the neighbour.
	226	*/
1da177e4 LT	227	int eth_header_cache(struct neighbour neigh, struct hh_cache hh)
	228	{
	229	unsigned short type = hh->hh_type;
	230	struct ethhdr *eth;
	231	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 == __constant_htons(ETH_P_802_3))
	237	return -1;
	238
	239	eth->h_proto = type;
	240	memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
	241	memcpy(eth->h_dest, neigh->ha, dev->addr_len);
	242	hh->hh_len = ETH_HLEN;
	243	return 0;
	244	}
	245
d3e01f71 SH	246	/**
	247	* eth_header_cache_update - update cache entry
	248	* @hh: destination cache entry
	249	* @dev: network device
	250	* @haddr: new hardware address
	251	*
1da177e4 LT	252	* Called by Address Resolution module to notify changes in address.
1da177e4 LT	253	*/
1da177e4 LT	254	void eth_header_cache_update(struct hh_cache hh, struct net_device dev, unsigned char * haddr)
	255	{
	256	memcpy(((u8*)hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
	257	haddr, dev->addr_len);
	258	}
	259
	260	EXPORT_SYMBOL(eth_type_trans);
	261
d3e01f71 SH	262	/**
	263	* eth_mac_addr - set new Ethernet hardware address
	264	* @dev: network device
	265	* @p: socket address
	266	* Change hardware address of device.
	267	*
	268	* This doesn't change hardware matching, so needs to be overridden
	269	* for most real devices.
	270	*/
1da177e4 LT	271	static int eth_mac_addr(struct net_device dev, void p)
	272	{
	273	struct sockaddr *addr=p;
	274	if (netif_running(dev))
	275	return -EBUSY;
	276	memcpy(dev->dev_addr, addr->sa_data,dev->addr_len);
	277	return 0;
	278	}
	279
d3e01f71 SH	280	/**
	281	* eth_change_mtu - set new MTU size
	282	* @dev: network device
	283	* @new_mtu: new Maximum Transfer Unit
	284	*
	285	* Allow changing MTU size. Needs to be overridden for devices
	286	* supporting jumbo frames.
	287	*/
1da177e4 LT	288	static int eth_change_mtu(struct net_device *dev, int new_mtu)
1da177e4 LT	289	{
46f25dff	290	if (new_mtu < 68 \|\| new_mtu > ETH_DATA_LEN)
1da177e4 LT	291	return -EINVAL;
	292	dev->mtu = new_mtu;
	293	return 0;
	294	}
	295
d3e01f71 SH	296	/**
	297	* ether_setup - setup Ethernet network device
	298	* @dev: network device
	299	* Fill in the fields of the device structure with Ethernet-generic values.
1da177e4 LT	300	*/
	301	void ether_setup(struct net_device *dev)
	302	{
	303	dev->change_mtu = eth_change_mtu;
	304	dev->hard_header = eth_header;
	305	dev->rebuild_header = eth_rebuild_header;
	306	dev->set_mac_address = eth_mac_addr;
	307	dev->hard_header_cache = eth_header_cache;
	308	dev->header_cache_update= eth_header_cache_update;
	309	dev->hard_header_parse = eth_header_parse;
	310
	311	dev->type = ARPHRD_ETHER;
	312	dev->hard_header_len = ETH_HLEN;
46f25dff	313	dev->mtu = ETH_DATA_LEN;
1da177e4 LT	314	dev->addr_len = ETH_ALEN;
	315	dev->tx_queue_len = 1000; /* Ethernet wants good queues */
	316	dev->flags = IFF_BROADCAST\|IFF_MULTICAST;
	317
	318	memset(dev->broadcast,0xFF, ETH_ALEN);
	319
	320	}
	321	EXPORT_SYMBOL(ether_setup);
	322
	323	/**
d3e01f71	324	* alloc_etherdev - Allocates and sets up an Ethernet device
1da177e4	325	* @sizeof_priv: Size of additional driver-private structure to be allocated
d3e01f71	326	* for this Ethernet device
1da177e4	327	*
d3e01f71	328	* Fill in the fields of the device structure with Ethernet-generic
1da177e4 LT	329	* values. Basically does everything except registering the device.
	330	*
	331	* Constructs a new net device, complete with a private data area of
d3e01f71	332	* size (sizeof_priv). A 32-byte (not bit) alignment is enforced for
1da177e4 LT	333	* this private data area.
	334	*/
	335
	336	struct net_device *alloc_etherdev(int sizeof_priv)
	337	{
	338	return alloc_netdev(sizeof_priv, "eth%d", ether_setup);
	339	}
	340	EXPORT_SYMBOL(alloc_etherdev);