Release 4.15 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 <linux/of_net.h>
#include <linux/pci.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 <net/flow_dissector.h>
#include <linux/uaccess.h>
#include <net/pkt_sched.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 = 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;
}
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Stephen Hemminger
6
4.11%
3
18.75%
Octavian Purdila
4
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Denys Vlasenko
4
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Kai Germaschewski
3
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Eric Dumazet
1
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Joe Perches
1
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1
6.25%
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16
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EXPORT_SYMBOL(eth_header);

/**
 * eth_get_headlen - determine 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 unsigned int flags = FLOW_DISSECTOR_F_PARSE_1ST_FRAG;
	const struct ethhdr *eth = (const struct ethhdr *)data;
	struct flow_keys keys;

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

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

	/* parse for any L4 headers */
	return min_t(u32, __skb_get_poff(NULL, data, &keys, len), len);
}
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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);
}
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34
17.09%
2
6.90%
Alexander Duyck
15
7.54%
4
13.79%
Lennert Buytenhek
14
7.04%
2
6.90%
Stephen Hemminger
9
4.52%
2
6.90%
Arnaldo Carvalho de Melo
8
4.02%
2
6.90%
David S. Miller
4
2.01%
2
6.90%
Joe Perches
3
1.51%
1
3.45%
Kris Katterjohn
2
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Florian Fainelli
2
1.01%
1
3.45%
Changli Gao
1
0.50%
1
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Kai Germaschewski
1
0.50%
1
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Alexey Dobriyan
1
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1
3.45%
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29
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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;
}
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3
7.32%
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Stephen Hemminger
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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;
}
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21.19%
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16.67%
Stephen Hemminger
4
3.39%
2
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Al Viro
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8.33%
Hideaki Yoshifuji / 吉藤英明
1
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1
8.33%
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100.00%
12
100.00%


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);
}
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8
16.67%
1
14.29%
Stephen Hemminger
3
6.25%
2
28.57%
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48
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7
100.00%


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;
}
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Patrick McHardy
14
24.14%
1
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Jiri Pirko
9
15.52%
1
25.00%
Stefan Hajnoczi
5
8.62%
1
25.00%
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58
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4
100.00%


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);
}
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61.76%
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33.33%
Christoph Hellwig
12
35.29%
1
33.33%
Stephen Hemminger
1
2.94%
1
33.33%
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34
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3
100.00%


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;
}
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8.89%
1
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45
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2
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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)
{
	netdev_warn(dev, "%s is deprecated\n", __func__);
	dev->mtu = new_mtu;
	return 0;
}
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9
29.03%
1
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31
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2
100.00%


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;
}
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1
3.70%
1
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27
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100.00%


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->min_header_len	= ETH_HLEN;
	dev->mtu		= ETH_DATA_LEN;
	dev->min_mtu		= ETH_MIN_MTU;
	dev->max_mtu		= ETH_DATA_LEN;
	dev->addr_len		= ETH_ALEN;
	dev->tx_queue_len	= DEFAULT_TX_QUEUE_LEN;
	dev->flags		= IFF_BROADCAST|IFF_MULTICAST;
	dev->priv_flags		|= IFF_TX_SKB_SHARING;

	eth_broadcast_addr(dev->broadcast);

}
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12
13.95%
1
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Neil Horman
6
6.98%
2
20.00%
Willem de Bruijn
6
6.98%
1
10.00%
Stephen Hemminger
3
3.49%
1
10.00%
Jeff Garzik
2
2.33%
1
10.00%
Kris Katterjohn
1
1.16%
1
10.00%
Joe Perches
1
1.16%
1
10.00%
Jesper Dangaard Brouer
1
1.16%
1
10.00%
Total
86
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10
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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);
}
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11.76%
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Tom Gundersen
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EXPORT_SYMBOL(alloc_etherdev_mqs);



static void devm_free_netdev(struct device *dev, void *res)
{
	free_netdev(*(struct net_device **)res);
}

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struct net_device *devm_alloc_etherdev_mqs(struct device *dev, int sizeof_priv,
					   unsigned int txqs, unsigned int rxqs)
{
	struct net_device **dr;
	struct net_device *netdev;

	dr = devres_alloc(devm_free_netdev, sizeof(*dr), GFP_KERNEL);
	if (!dr)
		return NULL;

	netdev = alloc_etherdev_mqs(sizeof_priv, txqs, rxqs);
	if (!netdev) {
		devres_free(dr);
		return NULL;
	}

	*dr = netdev;
	devres_add(dev, dr);

	return netdev;
}
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EXPORT_SYMBOL(devm_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);
}
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12.50%
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Joe Perches
3
9.38%
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Changli Gao
1
3.12%
1
25.00%
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4
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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 = call_gro_receive(ptype->callbacks.gro_receive, head, skb);

out_unlock:
	rcu_read_unlock();
out:
	skb_gro_flush_final(skb, pp, flush);

	return pp;
}
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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;
}
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EXPORT_SYMBOL(eth_gro_complete);


static struct packet_offload eth_packet_offload __read_mostly = {
	.type = cpu_to_be16(ETH_P_TEB),
	.priority = 10,
	.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;
}

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100.00%


fs_initcall(eth_offload_init);



unsigned char * __weak arch_get_platform_mac_address(void)
{
	return NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
13
100.00%
1
100.00%
Total
13
100.00%
1
100.00%



int eth_platform_get_mac_address(struct device *dev, u8 *mac_addr)
{
	const unsigned char *addr;
	struct device_node *dp;

	if (dev_is_pci(dev))
		dp = pci_device_to_OF_node(to_pci_dev(dev));
	else
		dp = dev->of_node;

	addr = NULL;
	if (dp)
		addr = of_get_mac_address(dp);
	if (!addr)
		addr = arch_get_platform_mac_address();

	if (!addr)
		return -ENODEV;

	ether_addr_copy(mac_addr, addr);
	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David S. Miller
93
100.00%
1
100.00%
Total
93
100.00%
1
100.00%


EXPORT_SYMBOL(eth_platform_get_mac_address);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
442
23.24%
19
20.21%
Jesse Gross
433
22.77%
1
1.06%
David S. Miller
163
8.57%
7
7.45%
Christoph Hellwig
149
7.83%
1
1.06%
Alexander Duyck
133
6.99%
6
6.38%
Rafał Miłecki
130
6.83%
1
1.06%
Stephen Hemminger
100
5.26%
7
7.45%
Stefan Hajnoczi
80
4.21%
1
1.06%
Eric Dumazet
35
1.84%
3
3.19%
Michael Chan
29
1.52%
1
1.06%
Jeff Garzik
28
1.47%
1
1.06%
Jarod Wilson
21
1.10%
1
1.06%
Lennert Buytenhek
17
0.89%
2
2.13%
Patrick McHardy
15
0.79%
2
2.13%
Arnaldo Carvalho de Melo
14
0.74%
4
4.26%
Jiri Pirko
14
0.74%
3
3.19%
Tom Herbert
13
0.68%
3
3.19%
Jamal Hadi Salim
12
0.63%
1
1.06%
Joe Perches
8
0.42%
3
3.19%
Jesper Dangaard Brouer
7
0.37%
2
2.13%
Neil Horman
6
0.32%
2
2.13%
Kris Katterjohn
6
0.32%
2
2.13%
Willem de Bruijn
6
0.32%
1
1.06%
Octavian Purdila
5
0.26%
1
1.06%
Steffen Klassert
5
0.26%
1
1.06%
Peter P. Waskiewicz Jr
4
0.21%
1
1.06%
Kai Germaschewski
4
0.21%
2
2.13%
Denys Vlasenko
4
0.21%
1
1.06%
Sabrina Dubroca
3
0.16%
1
1.06%
Florian Fainelli
2
0.11%
1
1.06%
Hideaki Yoshifuji / 吉藤英明
2
0.11%
2
2.13%
Tom Gundersen
2
0.11%
1
1.06%
Ben Hutchings
2
0.11%
1
1.06%
Changli Gao
2
0.11%
2
2.13%
Alexey Dobriyan
1
0.05%
1
1.06%
Al Viro
1
0.05%
1
1.06%
Avinash Kumar
1
0.05%
1
1.06%
Masanari Iida
1
0.05%
1
1.06%
Linus Torvalds
1
0.05%
1
1.06%
Randy Dunlap
1
0.05%
1
1.06%
Total
1902
100.00%
94
100.00%
Directory: net/ethernet

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