[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)) {
		eth_zero_addr(eth->h_dest);
		return ETH_HLEN;
	}

	return -ETH_HLEN;
}
EXPORT_SYMBOL(eth_header);

/**
 * eth_get_headlen - determine the the length of header for an ethernet frame
 * @data: pointer to start of frame
 * @len: total length of frame
 *
 * Make a best effort attempt to pull the length for all of the headers for
 * a given frame in a linear buffer.
 */
u32 eth_get_headlen(void *data, unsigned int len)
{
	const struct ethhdr *eth = (const struct ethhdr *)data;
	struct flow_keys keys;

	/* this should never happen, but better safe than sorry */
	if (len < sizeof(*eth))
		return len;

	/* parse any remaining L2/L3 headers, check for L4 */
	if (!__skb_flow_dissect(NULL, &keys, data,
				eth->h_proto, sizeof(*eth), len))
		return max_t(u32, keys.thoff, sizeof(*eth));

	/* parse for any L4 headers */
	return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len);
}
EXPORT_SYMBOL(eth_get_headlen);

/**
 * 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);

	eth = (struct ethhdr *)skb->data;
	skb_pull_inline(skb, ETH_HLEN);

	if (unlikely(is_multicast_ether_addr_64bits(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(eth_proto_is_802_3(eth->h_proto)))
		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,
	.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;

	eth_broadcast_addr(dev->broadcast);

}
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);

struct sk_buff **eth_gro_receive(struct sk_buff **head,
				 struct sk_buff *skb)
{
	struct sk_buff *p, **pp = NULL;
	struct ethhdr *eh, *eh2;
	unsigned int hlen, off_eth;
	const struct packet_offload *ptype;
	__be16 type;
	int flush = 1;

	off_eth = skb_gro_offset(skb);
	hlen = off_eth + sizeof(*eh);
	eh = skb_gro_header_fast(skb, off_eth);
	if (skb_gro_header_hard(skb, hlen)) {
		eh = skb_gro_header_slow(skb, hlen, off_eth);
		if (unlikely(!eh))
			goto out;
	}

	flush = 0;

	for (p = *head; p; p = p->next) {
		if (!NAPI_GRO_CB(p)->same_flow)
			continue;

		eh2 = (struct ethhdr *)(p->data + off_eth);
		if (compare_ether_header(eh, eh2)) {
			NAPI_GRO_CB(p)->same_flow = 0;
			continue;
		}
	}

	type = eh->h_proto;

	rcu_read_lock();
	ptype = gro_find_receive_by_type(type);
	if (ptype == NULL) {
		flush = 1;
		goto out_unlock;
	}

	skb_gro_pull(skb, sizeof(*eh));
	skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
	pp = ptype->callbacks.gro_receive(head, skb);

out_unlock:
	rcu_read_unlock();
out:
	NAPI_GRO_CB(skb)->flush |= flush;

	return pp;
}
EXPORT_SYMBOL(eth_gro_receive);

int eth_gro_complete(struct sk_buff *skb, int nhoff)
{
	struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff);
	__be16 type = eh->h_proto;
	struct packet_offload *ptype;
	int err = -ENOSYS;

	if (skb->encapsulation)
		skb_set_inner_mac_header(skb, nhoff);

	rcu_read_lock();
	ptype = gro_find_complete_by_type(type);
	if (ptype != NULL)
		err = ptype->callbacks.gro_complete(skb, nhoff +
						    sizeof(struct ethhdr));

	rcu_read_unlock();
	return err;
}
EXPORT_SYMBOL(eth_gro_complete);

static struct packet_offload eth_packet_offload __read_mostly = {
	.type = cpu_to_be16(ETH_P_TEB),
	.callbacks = {
		.gro_receive = eth_gro_receive,
		.gro_complete = eth_gro_complete,
	},
};

static int __init eth_offload_init(void)
{
	dev_add_offload(&eth_packet_offload);

	return 0;
}

fs_initcall(eth_offload_init);
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>
cf85d08f	60	#include <net/dsa.h>
118a7b0e	61	#include <linux/uaccess.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	74	*
bf9ae538 OP	75	* Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length
bf9ae538 OP	76	* in here instead.
1da177e4	77	*/
3b04ddde SH	78	int eth_header(struct sk_buff skb, struct net_device dev,
3b04ddde SH	79	unsigned short type,
95c96174	80	const void daddr, const void saddr, unsigned int len)
1da177e4	81	{
2e4ca75b	82	struct ethhdr eth = (struct ethhdr )skb_push(skb, ETH_HLEN);
1da177e4	83
bf9ae538	84	if (type != ETH_P_802_3 && type != ETH_P_802_2)
1da177e4 LT	85	eth->h_proto = htons(type);
	86	else
	87	eth->h_proto = htons(len);
	88
	89	/*
2e4ca75b	90	* Set the source hardware address.
1da177e4	91	*/
2e4ca75b SH	92
2e4ca75b SH	93	if (!saddr)
ff593c59	94	saddr = dev->dev_addr;
23f1f4ef	95	memcpy(eth->h_source, saddr, ETH_ALEN);
1da177e4	96
2e4ca75b	97	if (daddr) {
23f1f4ef	98	memcpy(eth->h_dest, daddr, ETH_ALEN);
f8d0e3f1 JHS	99	return ETH_HLEN;
f8d0e3f1 JHS	100	}
2e4ca75b	101
1da177e4	102	/*
2e4ca75b	103	* Anyway, the loopback-device should never use this function...
1da177e4 LT	104	*/
1da177e4 LT	105
2e4ca75b	106	if (dev->flags & (IFF_LOOPBACK \| IFF_NOARP)) {
afc130dd	107	eth_zero_addr(eth->h_dest);
1da177e4 LT	108	return ETH_HLEN;
1da177e4 LT	109	}
2e4ca75b	110
1da177e4 LT	111	return -ETH_HLEN;
1da177e4 LT	112	}
3b04ddde	113	EXPORT_SYMBOL(eth_header);
1da177e4	114
56193d1b AD	115	/**
	116	* eth_get_headlen - determine the the length of header for an ethernet frame
	117	* @data: pointer to start of frame
	118	* @len: total length of frame
	119	*
	120	* Make a best effort attempt to pull the length for all of the headers for
	121	* a given frame in a linear buffer.
	122	*/
	123	u32 eth_get_headlen(void *data, unsigned int len)
	124	{
	125	const struct ethhdr eth = (const struct ethhdr )data;
	126	struct flow_keys keys;
	127
	128	/* this should never happen, but better safe than sorry */
	129	if (len < sizeof(*eth))
	130	return len;
	131
	132	/* parse any remaining L2/L3 headers, check for L4 */
	133	if (!__skb_flow_dissect(NULL, &keys, data,
	134	eth->h_proto, sizeof(*eth), len))
	135	return max_t(u32, keys.thoff, sizeof(*eth));
	136
	137	/* parse for any L4 headers */
	138	return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len);
	139	}
	140	EXPORT_SYMBOL(eth_get_headlen);
	141
d3e01f71 SH	142	/**
	143	* eth_type_trans - determine the packet's protocol ID.
	144	* @skb: received socket data
	145	* @dev: receiving network device
	146	*
	147	* The rule here is that we
	148	* assume 802.3 if the type field is short enough to be a length.
	149	* This is normal practice and works for any 'now in use' protocol.
1da177e4	150	*/
ab611487	151	__be16 eth_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4	152	{
0864c158 ED	153	unsigned short _service_access_point;
	154	const unsigned short *sap;
	155	const struct ethhdr *eth;
2e4ca75b	156
4c13eb66	157	skb->dev = dev;
459a98ed	158	skb_reset_mac_header(skb);
610986e7 AD	159
610986e7 AD	160	eth = (struct ethhdr *)skb->data;
47d29646	161	skb_pull_inline(skb, ETH_HLEN);
2e4ca75b	162
d54385ce	163	if (unlikely(is_multicast_ether_addr_64bits(eth->h_dest))) {
a6700db1	164	if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
ba645c16	165	skb->pkt_type = PACKET_BROADCAST;
1da177e4	166	else
ba645c16	167	skb->pkt_type = PACKET_MULTICAST;
1da177e4	168	}
12861b7b	169	else if (unlikely(!ether_addr_equal_64bits(eth->h_dest,
	170	dev->dev_addr)))
	171	skb->pkt_type = PACKET_OTHERHOST;
2e4ca75b	172
cf85d08f LB	173	/*
	174	* Some variants of DSA tagging don't have an ethertype field
	175	* at all, so we check here whether one of those tagging
	176	* variants has been configured on the receiving interface,
	177	* and if so, set skb->protocol without looking at the packet.
	178	*/
3e8a72d1 FF	179	if (unlikely(netdev_uses_dsa(dev)))
3e8a72d1 FF	180	return htons(ETH_P_XDSA);
cf85d08f	181
2c7a88c2	182	if (likely(eth_proto_is_802_3(eth->h_proto)))
1da177e4	183	return eth->h_proto;
2e4ca75b	184
1da177e4	185	/*
2e4ca75b SH	186	* This is a magic hack to spot IPX packets. Older Novell breaks
	187	* the protocol design and runs IPX over 802.3 without an 802.2 LLC
	188	* layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
	189	* won't work for fault tolerant netware but does for the rest.
1da177e4	190	*/
0864c158 ED	191	sap = skb_header_pointer(skb, 0, sizeof(*sap), &_service_access_point);
0864c158 ED	192	if (sap && *sap == 0xFFFF)
1da177e4	193	return htons(ETH_P_802_3);
2e4ca75b	194
1da177e4	195	/*
2e4ca75b	196	* Real 802.2 LLC
1da177e4 LT	197	*/
	198	return htons(ETH_P_802_2);
	199	}
2e4ca75b	200	EXPORT_SYMBOL(eth_type_trans);
1da177e4	201
d3e01f71 SH	202	/**
	203	* eth_header_parse - extract hardware address from packet
	204	* @skb: packet to extract header from
	205	* @haddr: destination buffer
	206	*/
3b04ddde	207	int eth_header_parse(const struct sk_buff skb, unsigned char haddr)
1da177e4	208	{
b95cce35	209	const struct ethhdr *eth = eth_hdr(skb);
1da177e4 LT	210	memcpy(haddr, eth->h_source, ETH_ALEN);
	211	return ETH_ALEN;
	212	}
3b04ddde	213	EXPORT_SYMBOL(eth_header_parse);
1da177e4	214
d3e01f71 SH	215	/**
	216	* eth_header_cache - fill cache entry from neighbour
	217	* @neigh: source neighbour
	218	* @hh: destination cache entry
48daec03	219	* @type: Ethernet type field
2c53040f	220	*
d3e01f71 SH	221	* Create an Ethernet header template from the neighbour.
d3e01f71 SH	222	*/
e69dd336	223	int eth_header_cache(const struct neighbour neigh, struct hh_cache hh, __be16 type)
1da177e4	224	{
1da177e4	225	struct ethhdr *eth;
3b04ddde	226	const struct net_device *dev = neigh->dev;
1da177e4	227
2e4ca75b SH	228	eth = (struct ethhdr *)
2e4ca75b SH	229	(((u8 ) hh->hh_data) + (HH_DATA_OFF(sizeof(eth))));
1da177e4	230
f576e24f	231	if (type == htons(ETH_P_802_3))
1da177e4 LT	232	return -1;
	233
	234	eth->h_proto = type;
23f1f4ef SH	235	memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
23f1f4ef SH	236	memcpy(eth->h_dest, neigh->ha, ETH_ALEN);
1da177e4 LT	237	hh->hh_len = ETH_HLEN;
	238	return 0;
	239	}
3b04ddde	240	EXPORT_SYMBOL(eth_header_cache);
1da177e4	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	*/
3b04ddde SH	250	void eth_header_cache_update(struct hh_cache *hh,
	251	const struct net_device *dev,
	252	const unsigned char *haddr)
1da177e4	253	{
2e4ca75b	254	memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
23f1f4ef	255	haddr, ETH_ALEN);
1da177e4	256	}
3b04ddde	257	EXPORT_SYMBOL(eth_header_cache_update);
1da177e4	258
fa0879e3 SH	259	/**
	260	* eth_prepare_mac_addr_change - prepare for mac change
	261	* @dev: network device
	262	* @p: socket address
	263	*/
	264	int eth_prepare_mac_addr_change(struct net_device dev, void p)
	265	{
	266	struct sockaddr *addr = p;
	267
	268	if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
	269	return -EBUSY;
	270	if (!is_valid_ether_addr(addr->sa_data))
	271	return -EADDRNOTAVAIL;
	272	return 0;
	273	}
	274	EXPORT_SYMBOL(eth_prepare_mac_addr_change);
	275
	276	/**
	277	* eth_commit_mac_addr_change - commit mac change
	278	* @dev: network device
	279	* @p: socket address
	280	*/
	281	void eth_commit_mac_addr_change(struct net_device dev, void p)
	282	{
	283	struct sockaddr *addr = p;
	284
	285	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
	286	}
	287	EXPORT_SYMBOL(eth_commit_mac_addr_change);
	288
d3e01f71 SH	289	/**
	290	* eth_mac_addr - set new Ethernet hardware address
	291	* @dev: network device
	292	* @p: socket address
2c53040f	293	*
d3e01f71 SH	294	* Change hardware address of device.
	295	*
	296	* This doesn't change hardware matching, so needs to be overridden
	297	* for most real devices.
	298	*/
ccad637b	299	int eth_mac_addr(struct net_device dev, void p)
1da177e4	300	{
fa0879e3	301	int ret;
71bffe55	302
fa0879e3 SH	303	ret = eth_prepare_mac_addr_change(dev, p);
	304	if (ret < 0)
	305	return ret;
	306	eth_commit_mac_addr_change(dev, p);
1da177e4 LT	307	return 0;
1da177e4 LT	308	}
ccad637b	309	EXPORT_SYMBOL(eth_mac_addr);
1da177e4	310
d3e01f71 SH	311	/**
	312	* eth_change_mtu - set new MTU size
	313	* @dev: network device
	314	* @new_mtu: new Maximum Transfer Unit
	315	*
	316	* Allow changing MTU size. Needs to be overridden for devices
	317	* supporting jumbo frames.
	318	*/
ccad637b	319	int eth_change_mtu(struct net_device *dev, int new_mtu)
1da177e4	320	{
46f25dff	321	if (new_mtu < 68 \|\| new_mtu > ETH_DATA_LEN)
1da177e4 LT	322	return -EINVAL;
	323	dev->mtu = new_mtu;
	324	return 0;
	325	}
ccad637b	326	EXPORT_SYMBOL(eth_change_mtu);
1da177e4	327
ccad637b	328	int eth_validate_addr(struct net_device *dev)
bada339b JG	329	{
bada339b JG	330	if (!is_valid_ether_addr(dev->dev_addr))
2ed9926e	331	return -EADDRNOTAVAIL;
bada339b JG	332
	333	return 0;
	334	}
ccad637b	335	EXPORT_SYMBOL(eth_validate_addr);
bada339b	336
3b04ddde SH	337	const struct header_ops eth_header_ops ____cacheline_aligned = {
	338	.create = eth_header,
	339	.parse = eth_header_parse,
3b04ddde SH	340	.cache = eth_header_cache,
	341	.cache_update = eth_header_cache_update,
	342	};
	343
d3e01f71 SH	344	/**
	345	* ether_setup - setup Ethernet network device
	346	* @dev: network device
2c53040f	347	*
d3e01f71	348	* Fill in the fields of the device structure with Ethernet-generic values.
1da177e4 LT	349	*/
	350	void ether_setup(struct net_device *dev)
	351	{
3b04ddde	352	dev->header_ops = &eth_header_ops;
1da177e4 LT	353	dev->type = ARPHRD_ETHER;
1da177e4 LT	354	dev->hard_header_len = ETH_HLEN;
46f25dff	355	dev->mtu = ETH_DATA_LEN;
1da177e4	356	dev->addr_len = ETH_ALEN;
03d52d7c	357	dev->tx_queue_len = 1000; /* Ethernet wants good queues */
1da177e4	358	dev->flags = IFF_BROADCAST\|IFF_MULTICAST;
31dda0ae	359	dev->priv_flags \|= IFF_TX_SKB_SHARING;
03d52d7c	360
afc130dd	361	eth_broadcast_addr(dev->broadcast);
1da177e4 LT	362
	363	}
	364	EXPORT_SYMBOL(ether_setup);
	365
	366	/**
36909ea4	367	* alloc_etherdev_mqs - Allocates and sets up an Ethernet device
1da177e4	368	* @sizeof_priv: Size of additional driver-private structure to be allocated
d3e01f71	369	* for this Ethernet device
36909ea4	370	* @txqs: The number of TX queues this device has.
3806b4f3	371	* @rxqs: The number of RX queues this device has.
1da177e4	372	*
d3e01f71	373	* Fill in the fields of the device structure with Ethernet-generic
1da177e4 LT	374	* values. Basically does everything except registering the device.
	375	*
	376	* Constructs a new net device, complete with a private data area of
d3e01f71	377	* size (sizeof_priv). A 32-byte (not bit) alignment is enforced for
1da177e4 LT	378	* this private data area.
	379	*/
	380
36909ea4 TH	381	struct net_device *alloc_etherdev_mqs(int sizeof_priv, unsigned int txqs,
36909ea4 TH	382	unsigned int rxqs)
1da177e4	383	{
c835a677 TG	384	return alloc_netdev_mqs(sizeof_priv, "eth%d", NET_NAME_UNKNOWN,
c835a677 TG	385	ether_setup, txqs, rxqs);
1da177e4	386	}
36909ea4	387	EXPORT_SYMBOL(alloc_etherdev_mqs);
0795af57	388
7ffc49a6 MC	389	ssize_t sysfs_format_mac(char buf, const unsigned char addr, int len)
7ffc49a6 MC	390	{
ae8e9c5a	391	return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr);
7ffc49a6 MC	392	}
7ffc49a6 MC	393	EXPORT_SYMBOL(sysfs_format_mac);
9b174d88 JG	394
	395	struct sk_buff eth_gro_receive(struct sk_buff head,
	396	struct sk_buff *skb)
	397	{
	398	struct sk_buff p, *pp = NULL;
	399	struct ethhdr eh, eh2;
	400	unsigned int hlen, off_eth;
	401	const struct packet_offload *ptype;
	402	__be16 type;
	403	int flush = 1;
	404
	405	off_eth = skb_gro_offset(skb);
	406	hlen = off_eth + sizeof(*eh);
	407	eh = skb_gro_header_fast(skb, off_eth);
	408	if (skb_gro_header_hard(skb, hlen)) {
	409	eh = skb_gro_header_slow(skb, hlen, off_eth);
	410	if (unlikely(!eh))
	411	goto out;
	412	}
	413
	414	flush = 0;
	415
	416	for (p = *head; p; p = p->next) {
	417	if (!NAPI_GRO_CB(p)->same_flow)
	418	continue;
	419
	420	eh2 = (struct ethhdr *)(p->data + off_eth);
	421	if (compare_ether_header(eh, eh2)) {
	422	NAPI_GRO_CB(p)->same_flow = 0;
	423	continue;
	424	}
	425	}
	426
	427	type = eh->h_proto;
	428
	429	rcu_read_lock();
	430	ptype = gro_find_receive_by_type(type);
	431	if (ptype == NULL) {
	432	flush = 1;
	433	goto out_unlock;
	434	}
	435
	436	skb_gro_pull(skb, sizeof(*eh));
	437	skb_gro_postpull_rcsum(skb, eh, sizeof(*eh));
	438	pp = ptype->callbacks.gro_receive(head, skb);
	439
	440	out_unlock:
	441	rcu_read_unlock();
	442	out:
	443	NAPI_GRO_CB(skb)->flush \|= flush;
	444
	445	return pp;
	446	}
	447	EXPORT_SYMBOL(eth_gro_receive);
	448
	449	int eth_gro_complete(struct sk_buff *skb, int nhoff)
	450	{
	451	struct ethhdr eh = (struct ethhdr )(skb->data + nhoff);
	452	__be16 type = eh->h_proto;
	453	struct packet_offload *ptype;
	454	int err = -ENOSYS;
	455
	456	if (skb->encapsulation)
	457	skb_set_inner_mac_header(skb, nhoff);
458
459	rcu_read_lock();
460	ptype = gro_find_complete_by_type(type);
461	if (ptype != NULL)
462	err = ptype->callbacks.gro_complete(skb, nhoff +
463	sizeof(struct ethhdr));
464
465	rcu_read_unlock();
466	return err;
467	}
468	EXPORT_SYMBOL(eth_gro_complete);
469
470	static struct packet_offload eth_packet_offload __read_mostly = {
471	.type = cpu_to_be16(ETH_P_TEB),
472	.callbacks = {
473	.gro_receive = eth_gro_receive,
474	.gro_complete = eth_gro_complete,
475	},
476	};
477
478	static int __init eth_offload_init(void)
479	{
480	dev_add_offload(&eth_packet_offload);
481
482	return 0;
483	}
484
485	fs_initcall(eth_offload_init);