dev.c 125.0 KB
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/*
 * 	NET3	Protocol independent device support routines.
 *
 *		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.
 *
 *	Derived from the non IP parts of dev.c 1.0.19
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 * 		Authors:	Ross Biro
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 *				Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *				Mark Evans, <evansmp@uhura.aston.ac.uk>
 *
 *	Additional Authors:
 *		Florian la Roche <rzsfl@rz.uni-sb.de>
 *		Alan Cox <gw4pts@gw4pts.ampr.org>
 *		David Hinds <dahinds@users.sourceforge.net>
 *		Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
 *		Adam Sulmicki <adam@cfar.umd.edu>
 *              Pekka Riikonen <priikone@poesidon.pspt.fi>
 *
 *	Changes:
 *              D.J. Barrow     :       Fixed bug where dev->refcnt gets set
 *              			to 2 if register_netdev gets called
 *              			before net_dev_init & also removed a
 *              			few lines of code in the process.
 *		Alan Cox	:	device private ioctl copies fields back.
 *		Alan Cox	:	Transmit queue code does relevant
 *					stunts to keep the queue safe.
 *		Alan Cox	:	Fixed double lock.
 *		Alan Cox	:	Fixed promisc NULL pointer trap
 *		????????	:	Support the full private ioctl range
 *		Alan Cox	:	Moved ioctl permission check into
 *					drivers
 *		Tim Kordas	:	SIOCADDMULTI/SIOCDELMULTI
 *		Alan Cox	:	100 backlog just doesn't cut it when
 *					you start doing multicast video 8)
 *		Alan Cox	:	Rewrote net_bh and list manager.
 *		Alan Cox	: 	Fix ETH_P_ALL echoback lengths.
 *		Alan Cox	:	Took out transmit every packet pass
 *					Saved a few bytes in the ioctl handler
 *		Alan Cox	:	Network driver sets packet type before
 *					calling netif_rx. Saves a function
 *					call a packet.
 *		Alan Cox	:	Hashed net_bh()
 *		Richard Kooijman:	Timestamp fixes.
 *		Alan Cox	:	Wrong field in SIOCGIFDSTADDR
 *		Alan Cox	:	Device lock protection.
 *		Alan Cox	: 	Fixed nasty side effect of device close
 *					changes.
 *		Rudi Cilibrasi	:	Pass the right thing to
 *					set_mac_address()
 *		Dave Miller	:	32bit quantity for the device lock to
 *					make it work out on a Sparc.
 *		Bjorn Ekwall	:	Added KERNELD hack.
 *		Alan Cox	:	Cleaned up the backlog initialise.
 *		Craig Metz	:	SIOCGIFCONF fix if space for under
 *					1 device.
 *	    Thomas Bogendoerfer :	Return ENODEV for dev_open, if there
 *					is no device open function.
 *		Andi Kleen	:	Fix error reporting for SIOCGIFCONF
 *	    Michael Chastain	:	Fix signed/unsigned for SIOCGIFCONF
 *		Cyrus Durgin	:	Cleaned for KMOD
 *		Adam Sulmicki   :	Bug Fix : Network Device Unload
 *					A network device unload needs to purge
 *					the backlog queue.
 *	Paul Rusty Russell	:	SIOCSIFNAME
 *              Pekka Riikonen  :	Netdev boot-time settings code
 *              Andrew Morton   :       Make unregister_netdevice wait
 *              			indefinitely on dev->refcnt
 * 		J Hadi Salim	:	- Backlog queue sampling
 *				        - netif_rx() feedback
 */

#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/bitops.h>
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#include <linux/capability.h>
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#include <linux/cpu.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
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#include <linux/mutex.h>
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#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/notifier.h>
#include <linux/skbuff.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
#include <linux/rtnetlink.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/stat.h>
#include <linux/if_bridge.h>
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#include <linux/if_macvlan.h>
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#include <net/dst.h>
#include <net/pkt_sched.h>
#include <net/checksum.h>
#include <linux/highmem.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/module.h>
#include <linux/netpoll.h>
#include <linux/rcupdate.h>
#include <linux/delay.h>
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#include <net/wext.h>
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#include <net/iw_handler.h>
#include <asm/current.h>
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#include <linux/audit.h>
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#include <linux/dmaengine.h>
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#include <linux/err.h>
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#include <linux/ctype.h>
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#include <linux/if_arp.h>
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#include <linux/if_vlan.h>
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#include <linux/ip.h>
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#include <net/ip.h>
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#include <linux/ipv6.h>
#include <linux/in.h>
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#include <linux/jhash.h>
#include <linux/random.h>
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#include "net-sysfs.h"

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/* Instead of increasing this, you should create a hash table. */
#define MAX_GRO_SKBS 8

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/* This should be increased if a protocol with a bigger head is added. */
#define GRO_MAX_HEAD (MAX_HEADER + 128)

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/*
 *	The list of packet types we will receive (as opposed to discard)
 *	and the routines to invoke.
 *
 *	Why 16. Because with 16 the only overlap we get on a hash of the
 *	low nibble of the protocol value is RARP/SNAP/X.25.
 *
 *      NOTE:  That is no longer true with the addition of VLAN tags.  Not
 *             sure which should go first, but I bet it won't make much
 *             difference if we are running VLANs.  The good news is that
 *             this protocol won't be in the list unless compiled in, so
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 *             the average user (w/out VLANs) will not be adversely affected.
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 *             --BLG
 *
 *		0800	IP
 *		8100    802.1Q VLAN
 *		0001	802.3
 *		0002	AX.25
 *		0004	802.2
 *		8035	RARP
 *		0005	SNAP
 *		0805	X.25
 *		0806	ARP
 *		8137	IPX
 *		0009	Localtalk
 *		86DD	IPv6
 */

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#define PTYPE_HASH_SIZE	(16)
#define PTYPE_HASH_MASK	(PTYPE_HASH_SIZE - 1)

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static DEFINE_SPINLOCK(ptype_lock);
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static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
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static struct list_head ptype_all __read_mostly;	/* Taps */
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/*
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 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
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 * semaphore.
 *
 * Pure readers hold dev_base_lock for reading.
 *
 * Writers must hold the rtnl semaphore while they loop through the
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 * dev_base_head list, and hold dev_base_lock for writing when they do the
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 * actual updates.  This allows pure readers to access the list even
 * while a writer is preparing to update it.
 *
 * To put it another way, dev_base_lock is held for writing only to
 * protect against pure readers; the rtnl semaphore provides the
 * protection against other writers.
 *
 * See, for example usages, register_netdevice() and
 * unregister_netdevice(), which must be called with the rtnl
 * semaphore held.
 */
DEFINE_RWLOCK(dev_base_lock);

EXPORT_SYMBOL(dev_base_lock);

#define NETDEV_HASHBITS	8
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#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
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static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
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{
	unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
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	return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)];
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}

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static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
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{
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	return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)];
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}

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/* Device list insertion */
static int list_netdevice(struct net_device *dev)
{
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	struct net *net = dev_net(dev);
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	ASSERT_RTNL();

	write_lock_bh(&dev_base_lock);
	list_add_tail(&dev->dev_list, &net->dev_base_head);
	hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
	hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
	write_unlock_bh(&dev_base_lock);
	return 0;
}

/* Device list removal */
static void unlist_netdevice(struct net_device *dev)
{
	ASSERT_RTNL();

	/* Unlink dev from the device chain */
	write_lock_bh(&dev_base_lock);
	list_del(&dev->dev_list);
	hlist_del(&dev->name_hlist);
	hlist_del(&dev->index_hlist);
	write_unlock_bh(&dev_base_lock);
}

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/*
 *	Our notifier list
 */

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static RAW_NOTIFIER_HEAD(netdev_chain);
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/*
 *	Device drivers call our routines to queue packets here. We empty the
 *	queue in the local softnet handler.
 */
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DEFINE_PER_CPU(struct softnet_data, softnet_data);
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#ifdef CONFIG_LOCKDEP
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/*
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 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
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 * according to dev->type
 */
static const unsigned short netdev_lock_type[] =
	{ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
	 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
	 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
	 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
	 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
	 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
	 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
	 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
	 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
	 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
	 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
	 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
	 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
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	 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
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	 ARPHRD_PHONET_PIPE, ARPHRD_VOID, ARPHRD_NONE};
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static const char *netdev_lock_name[] =
	{"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
	 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
	 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
	 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
	 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
	 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
	 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
	 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
	 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
	 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
	 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
	 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
	 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
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	 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
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	 "_xmit_PHONET_PIPE", "_xmit_VOID", "_xmit_NONE"};
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static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
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static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
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static inline unsigned short netdev_lock_pos(unsigned short dev_type)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
		if (netdev_lock_type[i] == dev_type)
			return i;
	/* the last key is used by default */
	return ARRAY_SIZE(netdev_lock_type) - 1;
}

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static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
						 unsigned short dev_type)
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{
	int i;

	i = netdev_lock_pos(dev_type);
	lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
				   netdev_lock_name[i]);
}
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static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
{
	int i;

	i = netdev_lock_pos(dev->type);
	lockdep_set_class_and_name(&dev->addr_list_lock,
				   &netdev_addr_lock_key[i],
				   netdev_lock_name[i]);
}
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#else
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static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
						 unsigned short dev_type)
{
}
static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
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{
}
#endif
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/*******************************************************************************

		Protocol management and registration routines

*******************************************************************************/

/*
 *	Add a protocol ID to the list. Now that the input handler is
 *	smarter we can dispense with all the messy stuff that used to be
 *	here.
 *
 *	BEWARE!!! Protocol handlers, mangling input packets,
 *	MUST BE last in hash buckets and checking protocol handlers
 *	MUST start from promiscuous ptype_all chain in net_bh.
 *	It is true now, do not change it.
 *	Explanation follows: if protocol handler, mangling packet, will
 *	be the first on list, it is not able to sense, that packet
 *	is cloned and should be copied-on-write, so that it will
 *	change it and subsequent readers will get broken packet.
 *							--ANK (980803)
 */

/**
 *	dev_add_pack - add packet handler
 *	@pt: packet type declaration
 *
 *	Add a protocol handler to the networking stack. The passed &packet_type
 *	is linked into kernel lists and may not be freed until it has been
 *	removed from the kernel lists.
 *
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 *	This call does not sleep therefore it can not
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 *	guarantee all CPU's that are in middle of receiving packets
 *	will see the new packet type (until the next received packet).
 */

void dev_add_pack(struct packet_type *pt)
{
	int hash;

	spin_lock_bh(&ptype_lock);
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	if (pt->type == htons(ETH_P_ALL))
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		list_add_rcu(&pt->list, &ptype_all);
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	else {
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		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
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		list_add_rcu(&pt->list, &ptype_base[hash]);
	}
	spin_unlock_bh(&ptype_lock);
}

/**
 *	__dev_remove_pack	 - remove packet handler
 *	@pt: packet type declaration
 *
 *	Remove a protocol handler that was previously added to the kernel
 *	protocol handlers by dev_add_pack(). The passed &packet_type is removed
 *	from the kernel lists and can be freed or reused once this function
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 *	returns.
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 *
 *      The packet type might still be in use by receivers
 *	and must not be freed until after all the CPU's have gone
 *	through a quiescent state.
 */
void __dev_remove_pack(struct packet_type *pt)
{
	struct list_head *head;
	struct packet_type *pt1;

	spin_lock_bh(&ptype_lock);

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	if (pt->type == htons(ETH_P_ALL))
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		head = &ptype_all;
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	else
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		head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
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	list_for_each_entry(pt1, head, list) {
		if (pt == pt1) {
			list_del_rcu(&pt->list);
			goto out;
		}
	}

	printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
out:
	spin_unlock_bh(&ptype_lock);
}
/**
 *	dev_remove_pack	 - remove packet handler
 *	@pt: packet type declaration
 *
 *	Remove a protocol handler that was previously added to the kernel
 *	protocol handlers by dev_add_pack(). The passed &packet_type is removed
 *	from the kernel lists and can be freed or reused once this function
 *	returns.
 *
 *	This call sleeps to guarantee that no CPU is looking at the packet
 *	type after return.
 */
void dev_remove_pack(struct packet_type *pt)
{
	__dev_remove_pack(pt);
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	synchronize_net();
}

/******************************************************************************

		      Device Boot-time Settings Routines

*******************************************************************************/

/* Boot time configuration table */
static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];

/**
 *	netdev_boot_setup_add	- add new setup entry
 *	@name: name of the device
 *	@map: configured settings for the device
 *
 *	Adds new setup entry to the dev_boot_setup list.  The function
 *	returns 0 on error and 1 on success.  This is a generic routine to
 *	all netdevices.
 */
static int netdev_boot_setup_add(char *name, struct ifmap *map)
{
	struct netdev_boot_setup *s;
	int i;

	s = dev_boot_setup;
	for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
		if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
			memset(s[i].name, 0, sizeof(s[i].name));
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			strlcpy(s[i].name, name, IFNAMSIZ);
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			memcpy(&s[i].map, map, sizeof(s[i].map));
			break;
		}
	}

	return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
}

/**
 *	netdev_boot_setup_check	- check boot time settings
 *	@dev: the netdevice
 *
 * 	Check boot time settings for the device.
 *	The found settings are set for the device to be used
 *	later in the device probing.
 *	Returns 0 if no settings found, 1 if they are.
 */
int netdev_boot_setup_check(struct net_device *dev)
{
	struct netdev_boot_setup *s = dev_boot_setup;
	int i;

	for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
		if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
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		    !strcmp(dev->name, s[i].name)) {
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			dev->irq 	= s[i].map.irq;
			dev->base_addr 	= s[i].map.base_addr;
			dev->mem_start 	= s[i].map.mem_start;
			dev->mem_end 	= s[i].map.mem_end;
			return 1;
		}
	}
	return 0;
}


/**
 *	netdev_boot_base	- get address from boot time settings
 *	@prefix: prefix for network device
 *	@unit: id for network device
 *
 * 	Check boot time settings for the base address of device.
 *	The found settings are set for the device to be used
 *	later in the device probing.
 *	Returns 0 if no settings found.
 */
unsigned long netdev_boot_base(const char *prefix, int unit)
{
	const struct netdev_boot_setup *s = dev_boot_setup;
	char name[IFNAMSIZ];
	int i;

	sprintf(name, "%s%d", prefix, unit);

	/*
	 * If device already registered then return base of 1
	 * to indicate not to probe for this interface
	 */
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	if (__dev_get_by_name(&init_net, name))
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		return 1;

	for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
		if (!strcmp(name, s[i].name))
			return s[i].map.base_addr;
	return 0;
}

/*
 * Saves at boot time configured settings for any netdevice.
 */
int __init netdev_boot_setup(char *str)
{
	int ints[5];
	struct ifmap map;

	str = get_options(str, ARRAY_SIZE(ints), ints);
	if (!str || !*str)
		return 0;

	/* Save settings */
	memset(&map, 0, sizeof(map));
	if (ints[0] > 0)
		map.irq = ints[1];
	if (ints[0] > 1)
		map.base_addr = ints[2];
	if (ints[0] > 2)
		map.mem_start = ints[3];
	if (ints[0] > 3)
		map.mem_end = ints[4];

	/* Add new entry to the list */
	return netdev_boot_setup_add(str, &map);
}

__setup("netdev=", netdev_boot_setup);

/*******************************************************************************

			    Device Interface Subroutines

*******************************************************************************/

/**
 *	__dev_get_by_name	- find a device by its name
569
 *	@net: the applicable net namespace
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 *	@name: name to find
 *
 *	Find an interface by name. Must be called under RTNL semaphore
 *	or @dev_base_lock. If the name is found a pointer to the device
 *	is returned. If the name is not found then %NULL is returned. The
 *	reference counters are not incremented so the caller must be
 *	careful with locks.
 */

579
struct net_device *__dev_get_by_name(struct net *net, const char *name)
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{
	struct hlist_node *p;

583
	hlist_for_each(p, dev_name_hash(net, name)) {
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		struct net_device *dev
			= hlist_entry(p, struct net_device, name_hlist);
		if (!strncmp(dev->name, name, IFNAMSIZ))
			return dev;
	}
	return NULL;
}

/**
 *	dev_get_by_name		- find a device by its name
594
 *	@net: the applicable net namespace
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 *	@name: name to find
 *
 *	Find an interface by name. This can be called from any
 *	context and does its own locking. The returned handle has
 *	the usage count incremented and the caller must use dev_put() to
 *	release it when it is no longer needed. %NULL is returned if no
 *	matching device is found.
 */

604
struct net_device *dev_get_by_name(struct net *net, const char *name)
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{
	struct net_device *dev;

	read_lock(&dev_base_lock);
609
	dev = __dev_get_by_name(net, name);
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	if (dev)
		dev_hold(dev);
	read_unlock(&dev_base_lock);
	return dev;
}

/**
 *	__dev_get_by_index - find a device by its ifindex
618
 *	@net: the applicable net namespace
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 *	@ifindex: index of device
 *
 *	Search for an interface by index. Returns %NULL if the device
 *	is not found or a pointer to the device. The device has not
 *	had its reference counter increased so the caller must be careful
 *	about locking. The caller must hold either the RTNL semaphore
 *	or @dev_base_lock.
 */

628
struct net_device *__dev_get_by_index(struct net *net, int ifindex)
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{
	struct hlist_node *p;

632
	hlist_for_each(p, dev_index_hash(net, ifindex)) {
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		struct net_device *dev
			= hlist_entry(p, struct net_device, index_hlist);
		if (dev->ifindex == ifindex)
			return dev;
	}
	return NULL;
}


/**
 *	dev_get_by_index - find a device by its ifindex
644
 *	@net: the applicable net namespace
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 *	@ifindex: index of device
 *
 *	Search for an interface by index. Returns NULL if the device
 *	is not found or a pointer to the device. The device returned has
 *	had a reference added and the pointer is safe until the user calls
 *	dev_put to indicate they have finished with it.
 */

653
struct net_device *dev_get_by_index(struct net *net, int ifindex)
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{
	struct net_device *dev;

	read_lock(&dev_base_lock);
658
	dev = __dev_get_by_index(net, ifindex);
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	if (dev)
		dev_hold(dev);
	read_unlock(&dev_base_lock);
	return dev;
}

/**
 *	dev_getbyhwaddr - find a device by its hardware address
667
 *	@net: the applicable net namespace
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 *	@type: media type of device
 *	@ha: hardware address
 *
 *	Search for an interface by MAC address. Returns NULL if the device
 *	is not found or a pointer to the device. The caller must hold the
 *	rtnl semaphore. The returned device has not had its ref count increased
 *	and the caller must therefore be careful about locking
 *
 *	BUGS:
 *	If the API was consistent this would be __dev_get_by_hwaddr
 */

680
struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
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{
	struct net_device *dev;

	ASSERT_RTNL();

686
	for_each_netdev(net, dev)
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		if (dev->type == type &&
		    !memcmp(dev->dev_addr, ha, dev->addr_len))
689 690 691
			return dev;

	return NULL;
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}

694 695
EXPORT_SYMBOL(dev_getbyhwaddr);

696
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
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{
	struct net_device *dev;

700
	ASSERT_RTNL();
701
	for_each_netdev(net, dev)
702
		if (dev->type == type)
703 704 705
			return dev;

	return NULL;
706 707 708 709
}

EXPORT_SYMBOL(__dev_getfirstbyhwtype);

710
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
711 712 713 714
{
	struct net_device *dev;

	rtnl_lock();
715
	dev = __dev_getfirstbyhwtype(net, type);
716 717
	if (dev)
		dev_hold(dev);
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	rtnl_unlock();
	return dev;
}

EXPORT_SYMBOL(dev_getfirstbyhwtype);

/**
 *	dev_get_by_flags - find any device with given flags
726
 *	@net: the applicable net namespace
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 *	@if_flags: IFF_* values
 *	@mask: bitmask of bits in if_flags to check
 *
 *	Search for any interface with the given flags. Returns NULL if a device
731
 *	is not found or a pointer to the device. The device returned has
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 *	had a reference added and the pointer is safe until the user calls
 *	dev_put to indicate they have finished with it.
 */

736
struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask)
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{
738
	struct net_device *dev, *ret;
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739

740
	ret = NULL;
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741
	read_lock(&dev_base_lock);
742
	for_each_netdev(net, dev) {
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		if (((dev->flags ^ if_flags) & mask) == 0) {
			dev_hold(dev);
745
			ret = dev;
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			break;
		}
	}
	read_unlock(&dev_base_lock);
750
	return ret;
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}

/**
 *	dev_valid_name - check if name is okay for network device
 *	@name: name string
 *
 *	Network device names need to be valid file names to
758 759
 *	to allow sysfs to work.  We also disallow any kind of
 *	whitespace.
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 */
761
int dev_valid_name(const char *name)
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{
763 764
	if (*name == '\0')
		return 0;
765 766
	if (strlen(name) >= IFNAMSIZ)
		return 0;
767 768 769 770 771 772 773 774 775
	if (!strcmp(name, ".") || !strcmp(name, ".."))
		return 0;

	while (*name) {
		if (*name == '/' || isspace(*name))
			return 0;
		name++;
	}
	return 1;
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}

/**
779 780
 *	__dev_alloc_name - allocate a name for a device
 *	@net: network namespace to allocate the device name in
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781
 *	@name: name format string
782
 *	@buf:  scratch buffer and result name string
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 *
 *	Passed a format string - eg "lt%d" it will try and find a suitable
S
Stephen Hemminger 已提交
785 786 787 788 789 790
 *	id. It scans list of devices to build up a free map, then chooses
 *	the first empty slot. The caller must hold the dev_base or rtnl lock
 *	while allocating the name and adding the device in order to avoid
 *	duplicates.
 *	Limited to bits_per_byte * page size devices (ie 32K on most platforms).
 *	Returns the number of the unit assigned or a negative errno code.
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 */

793
static int __dev_alloc_name(struct net *net, const char *name, char *buf)
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{
	int i = 0;
	const char *p;
	const int max_netdevices = 8*PAGE_SIZE;
S
Stephen Hemminger 已提交
798
	unsigned long *inuse;
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	struct net_device *d;

	p = strnchr(name, IFNAMSIZ-1, '%');
	if (p) {
		/*
		 * Verify the string as this thing may have come from
		 * the user.  There must be either one "%d" and no other "%"
		 * characters.
		 */
		if (p[1] != 'd' || strchr(p + 2, '%'))
			return -EINVAL;

		/* Use one page as a bit array of possible slots */
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Stephen Hemminger 已提交
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		inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
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		if (!inuse)
			return -ENOMEM;

816
		for_each_netdev(net, d) {
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			if (!sscanf(d->name, name, &i))
				continue;
			if (i < 0 || i >= max_netdevices)
				continue;

			/*  avoid cases where sscanf is not exact inverse of printf */
823
			snprintf(buf, IFNAMSIZ, name, i);
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			if (!strncmp(buf, d->name, IFNAMSIZ))
				set_bit(i, inuse);
		}

		i = find_first_zero_bit(inuse, max_netdevices);
		free_page((unsigned long) inuse);
	}

832 833
	snprintf(buf, IFNAMSIZ, name, i);
	if (!__dev_get_by_name(net, buf))
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		return i;

	/* It is possible to run out of possible slots
	 * when the name is long and there isn't enough space left
	 * for the digits, or if all bits are used.
	 */
	return -ENFILE;
}

843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862
/**
 *	dev_alloc_name - allocate a name for a device
 *	@dev: device
 *	@name: name format string
 *
 *	Passed a format string - eg "lt%d" it will try and find a suitable
 *	id. It scans list of devices to build up a free map, then chooses
 *	the first empty slot. The caller must hold the dev_base or rtnl lock
 *	while allocating the name and adding the device in order to avoid
 *	duplicates.
 *	Limited to bits_per_byte * page size devices (ie 32K on most platforms).
 *	Returns the number of the unit assigned or a negative errno code.
 */

int dev_alloc_name(struct net_device *dev, const char *name)
{
	char buf[IFNAMSIZ];
	struct net *net;
	int ret;

863 864
	BUG_ON(!dev_net(dev));
	net = dev_net(dev);
865 866 867 868 869 870
	ret = __dev_alloc_name(net, name, buf);
	if (ret >= 0)
		strlcpy(dev->name, buf, IFNAMSIZ);
	return ret;
}

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/**
 *	dev_change_name - change name of a device
 *	@dev: device
 *	@newname: name (or format string) must be at least IFNAMSIZ
 *
 *	Change name of a device, can pass format strings "eth%d".
 *	for wildcarding.
 */
880
int dev_change_name(struct net_device *dev, const char *newname)
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{
882
	char oldname[IFNAMSIZ];
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	int err = 0;
884
	int ret;
885
	struct net *net;
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	ASSERT_RTNL();
888
	BUG_ON(!dev_net(dev));
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890
	net = dev_net(dev);
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	if (dev->flags & IFF_UP)
		return -EBUSY;

	if (!dev_valid_name(newname))
		return -EINVAL;

897 898 899
	if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
		return 0;

900 901
	memcpy(oldname, dev->name, IFNAMSIZ);

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	if (strchr(newname, '%')) {
		err = dev_alloc_name(dev, newname);
		if (err < 0)
			return err;
	}
907
	else if (__dev_get_by_name(net, newname))
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		return -EEXIST;
	else
		strlcpy(dev->name, newname, IFNAMSIZ);

912
rollback:
913 914 915 916 917 918 919 920 921
	/* For now only devices in the initial network namespace
	 * are in sysfs.
	 */
	if (net == &init_net) {
		ret = device_rename(&dev->dev, dev->name);
		if (ret) {
			memcpy(dev->name, oldname, IFNAMSIZ);
			return ret;
		}
922
	}
923 924

	write_lock_bh(&dev_base_lock);
925
	hlist_del(&dev->name_hlist);
926
	hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
927 928
	write_unlock_bh(&dev_base_lock);

929
	ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
930 931 932 933 934 935 936 937 938 939 940 941 942
	ret = notifier_to_errno(ret);

	if (ret) {
		if (err) {
			printk(KERN_ERR
			       "%s: name change rollback failed: %d.\n",
			       dev->name, ret);
		} else {
			err = ret;
			memcpy(dev->name, oldname, IFNAMSIZ);
			goto rollback;
		}
	}
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	return err;
}

947 948 949 950
/**
 *	dev_set_alias - change ifalias of a device
 *	@dev: device
 *	@alias: name up to IFALIASZ
951
 *	@len: limit of bytes to copy from info
952 953 954 955 956 957 958 959 960 961
 *
 *	Set ifalias for a device,
 */
int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
{
	ASSERT_RTNL();

	if (len >= IFALIASZ)
		return -EINVAL;

962 963 964 965 966 967 968 969
	if (!len) {
		if (dev->ifalias) {
			kfree(dev->ifalias);
			dev->ifalias = NULL;
		}
		return 0;
	}

970 971 972 973 974 975 976 977 978
	dev->ifalias = krealloc(dev->ifalias, len+1, GFP_KERNEL);
	if (!dev->ifalias)
		return -ENOMEM;

	strlcpy(dev->ifalias, alias, len+1);
	return len;
}


979
/**
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Stephen Hemminger 已提交
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 *	netdev_features_change - device changes features
981 982 983 984 985 986
 *	@dev: device to cause notification
 *
 *	Called to indicate a device has changed features.
 */
void netdev_features_change(struct net_device *dev)
{
987
	call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
988 989 990
}
EXPORT_SYMBOL(netdev_features_change);

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/**
 *	netdev_state_change - device changes state
 *	@dev: device to cause notification
 *
 *	Called to indicate a device has changed state. This function calls
 *	the notifier chains for netdev_chain and sends a NEWLINK message
 *	to the routing socket.
 */
void netdev_state_change(struct net_device *dev)
{
	if (dev->flags & IFF_UP) {
1002
		call_netdevice_notifiers(NETDEV_CHANGE, dev);
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		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
	}
}

1007 1008 1009 1010 1011 1012
void netdev_bonding_change(struct net_device *dev)
{
	call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev);
}
EXPORT_SYMBOL(netdev_bonding_change);

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/**
 *	dev_load 	- load a network module
1015
 *	@net: the applicable net namespace
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 *	@name: name of interface
 *
 *	If a network interface is not present and the process has suitable
 *	privileges this function loads the module. If module loading is not
 *	available in this kernel then it becomes a nop.
 */

1023
void dev_load(struct net *net, const char *name)
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{
1025
	struct net_device *dev;
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1026 1027

	read_lock(&dev_base_lock);
1028
	dev = __dev_get_by_name(net, name);
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	read_unlock(&dev_base_lock);

	if (!dev && capable(CAP_SYS_MODULE))
		request_module("%s", name);
}

/**
 *	dev_open	- prepare an interface for use.
 *	@dev:	device to open
 *
 *	Takes a device from down to up state. The device's private open
 *	function is invoked and then the multicast lists are loaded. Finally
 *	the device is moved into the up state and a %NETDEV_UP message is
 *	sent to the netdev notifier chain.
 *
 *	Calling this function on an active interface is a nop. On a failure
 *	a negative errno code is returned.
 */
int dev_open(struct net_device *dev)
{
1049
	const struct net_device_ops *ops = dev->netdev_ops;
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	int ret = 0;

1052 1053
	ASSERT_RTNL();

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	/*
	 *	Is it already up?
	 */

	if (dev->flags & IFF_UP)
		return 0;

	/*
	 *	Is it even present?
	 */
	if (!netif_device_present(dev))
		return -ENODEV;

	/*
	 *	Call device private open method
	 */
	set_bit(__LINK_STATE_START, &dev->state);
1071

1072 1073
	if (ops->ndo_validate_addr)
		ret = ops->ndo_validate_addr(dev);
1074

1075 1076
	if (!ret && ops->ndo_open)
		ret = ops->ndo_open(dev);
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1078
	/*
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	 *	If it went open OK then:
	 */

1082 1083 1084
	if (ret)
		clear_bit(__LINK_STATE_START, &dev->state);
	else {
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		/*
		 *	Set the flags.
		 */
		dev->flags |= IFF_UP;

1090 1091 1092 1093 1094
		/*
		 *	Enable NET_DMA
		 */
		dmaengine_get();

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		/*
		 *	Initialize multicasting status
		 */
1098
		dev_set_rx_mode(dev);
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		/*
		 *	Wakeup transmit queue engine
		 */
		dev_activate(dev);

		/*
		 *	... and announce new interface.
		 */
1108
		call_netdevice_notifiers(NETDEV_UP, dev);
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	}
1110

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	return ret;
}

/**
 *	dev_close - shutdown an interface.
 *	@dev: device to shutdown
 *
 *	This function moves an active device into down state. A
 *	%NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
 *	is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
 *	chain.
 */
int dev_close(struct net_device *dev)
{
1125
	const struct net_device_ops *ops = dev->netdev_ops;
1126 1127
	ASSERT_RTNL();

1128 1129
	might_sleep();

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	if (!(dev->flags & IFF_UP))
		return 0;

	/*
	 *	Tell people we are going down, so that they can
	 *	prepare to death, when device is still operating.
	 */
1137
	call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
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	clear_bit(__LINK_STATE_START, &dev->state);

	/* Synchronize to scheduled poll. We cannot touch poll list,
1142 1143 1144 1145 1146
	 * it can be even on different cpu. So just clear netif_running().
	 *
	 * dev->stop() will invoke napi_disable() on all of it's
	 * napi_struct instances on this device.
	 */
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	smp_mb__after_clear_bit(); /* Commit netif_running(). */

1149 1150
	dev_deactivate(dev);

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	/*
	 *	Call the device specific close. This cannot fail.
	 *	Only if device is UP
	 *
	 *	We allow it to be called even after a DETACH hot-plug
	 *	event.
	 */
1158 1159
	if (ops->ndo_stop)
		ops->ndo_stop(dev);
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	/*
	 *	Device is now down.
	 */

	dev->flags &= ~IFF_UP;

	/*
	 * Tell people we are down
	 */
1170
	call_netdevice_notifiers(NETDEV_DOWN, dev);
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1172 1173 1174 1175 1176
	/*
	 *	Shutdown NET_DMA
	 */
	dmaengine_put();

L
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1177 1178 1179 1180
	return 0;
}


1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203
/**
 *	dev_disable_lro - disable Large Receive Offload on a device
 *	@dev: device
 *
 *	Disable Large Receive Offload (LRO) on a net device.  Must be
 *	called under RTNL.  This is needed if received packets may be
 *	forwarded to another interface.
 */
void dev_disable_lro(struct net_device *dev)
{
	if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
	    dev->ethtool_ops->set_flags) {
		u32 flags = dev->ethtool_ops->get_flags(dev);
		if (flags & ETH_FLAG_LRO) {
			flags &= ~ETH_FLAG_LRO;
			dev->ethtool_ops->set_flags(dev, flags);
		}
	}
	WARN_ON(dev->features & NETIF_F_LRO);
}
EXPORT_SYMBOL(dev_disable_lro);


1204 1205
static int dev_boot_phase = 1;

L
Linus Torvalds 已提交
1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
/*
 *	Device change register/unregister. These are not inline or static
 *	as we export them to the world.
 */

/**
 *	register_netdevice_notifier - register a network notifier block
 *	@nb: notifier
 *
 *	Register a notifier to be called when network device events occur.
 *	The notifier passed is linked into the kernel structures and must
 *	not be reused until it has been unregistered. A negative errno code
 *	is returned on a failure.
 *
 * 	When registered all registration and up events are replayed
1221
 *	to the new notifier to allow device to have a race free
L
Linus Torvalds 已提交
1222 1223 1224 1225 1226 1227
 *	view of the network device list.
 */

int register_netdevice_notifier(struct notifier_block *nb)
{
	struct net_device *dev;
1228
	struct net_device *last;
1229
	struct net *net;
L
Linus Torvalds 已提交
1230 1231 1232
	int err;

	rtnl_lock();
1233
	err = raw_notifier_chain_register(&netdev_chain, nb);
1234 1235
	if (err)
		goto unlock;
1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246
	if (dev_boot_phase)
		goto unlock;
	for_each_net(net) {
		for_each_netdev(net, dev) {
			err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
			err = notifier_to_errno(err);
			if (err)
				goto rollback;

			if (!(dev->flags & IFF_UP))
				continue;
L
Linus Torvalds 已提交
1247

1248 1249
			nb->notifier_call(nb, NETDEV_UP, dev);
		}
L
Linus Torvalds 已提交
1250
	}
1251 1252

unlock:
L
Linus Torvalds 已提交
1253 1254
	rtnl_unlock();
	return err;
1255 1256 1257

rollback:
	last = dev;
1258 1259 1260 1261
	for_each_net(net) {
		for_each_netdev(net, dev) {
			if (dev == last)
				break;
1262

1263 1264 1265 1266 1267
			if (dev->flags & IFF_UP) {
				nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
				nb->notifier_call(nb, NETDEV_DOWN, dev);
			}
			nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1268 1269
		}
	}
1270 1271

	raw_notifier_chain_unregister(&netdev_chain, nb);
1272
	goto unlock;
L
Linus Torvalds 已提交
1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286
}

/**
 *	unregister_netdevice_notifier - unregister a network notifier block
 *	@nb: notifier
 *
 *	Unregister a notifier previously registered by
 *	register_netdevice_notifier(). The notifier is unlinked into the
 *	kernel structures and may then be reused. A negative errno code
 *	is returned on a failure.
 */

int unregister_netdevice_notifier(struct notifier_block *nb)
{
1287 1288 1289
	int err;

	rtnl_lock();
1290
	err = raw_notifier_chain_unregister(&netdev_chain, nb);
1291 1292
	rtnl_unlock();
	return err;
L
Linus Torvalds 已提交
1293 1294 1295 1296 1297
}

/**
 *	call_netdevice_notifiers - call all network notifier blocks
 *      @val: value passed unmodified to notifier function
1298
 *      @dev: net_device pointer passed unmodified to notifier function
L
Linus Torvalds 已提交
1299 1300
 *
 *	Call all network notifier blocks.  Parameters and return value
1301
 *	are as for raw_notifier_call_chain().
L
Linus Torvalds 已提交
1302 1303
 */

1304
int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
L
Linus Torvalds 已提交
1305
{
1306
	return raw_notifier_call_chain(&netdev_chain, val, dev);
L
Linus Torvalds 已提交
1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321
}

/* When > 0 there are consumers of rx skb time stamps */
static atomic_t netstamp_needed = ATOMIC_INIT(0);

void net_enable_timestamp(void)
{
	atomic_inc(&netstamp_needed);
}

void net_disable_timestamp(void)
{
	atomic_dec(&netstamp_needed);
}

1322
static inline void net_timestamp(struct sk_buff *skb)
L
Linus Torvalds 已提交
1323 1324
{
	if (atomic_read(&netstamp_needed))
1325
		__net_timestamp(skb);
1326 1327
	else
		skb->tstamp.tv64 = 0;
L
Linus Torvalds 已提交
1328 1329 1330 1331 1332 1333 1334
}

/*
 *	Support routine. Sends outgoing frames to any network
 *	taps currently in use.
 */

1335
static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
L
Linus Torvalds 已提交
1336 1337
{
	struct packet_type *ptype;
1338 1339

	net_timestamp(skb);
L
Linus Torvalds 已提交
1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356

	rcu_read_lock();
	list_for_each_entry_rcu(ptype, &ptype_all, list) {
		/* Never send packets back to the socket
		 * they originated from - MvS (miquels@drinkel.ow.org)
		 */
		if ((ptype->dev == dev || !ptype->dev) &&
		    (ptype->af_packet_priv == NULL ||
		     (struct sock *)ptype->af_packet_priv != skb->sk)) {
			struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
			if (!skb2)
				break;

			/* skb->nh should be correctly
			   set by sender, so that the second statement is
			   just protection against buggy protocols.
			 */
1357
			skb_reset_mac_header(skb2);
L
Linus Torvalds 已提交
1358

1359
			if (skb_network_header(skb2) < skb2->data ||
1360
			    skb2->network_header > skb2->tail) {
L
Linus Torvalds 已提交
1361 1362 1363 1364
				if (net_ratelimit())
					printk(KERN_CRIT "protocol %04x is "
					       "buggy, dev %s\n",
					       skb2->protocol, dev->name);
1365
				skb_reset_network_header(skb2);
L
Linus Torvalds 已提交
1366 1367
			}

1368
			skb2->transport_header = skb2->network_header;
L
Linus Torvalds 已提交
1369
			skb2->pkt_type = PACKET_OUTGOING;
D
David S. Miller 已提交
1370
			ptype->func(skb2, skb->dev, ptype, skb->dev);
L
Linus Torvalds 已提交
1371 1372 1373 1374 1375
		}
	}
	rcu_read_unlock();
}

1376

1377
static inline void __netif_reschedule(struct Qdisc *q)
1378
{
1379 1380
	struct softnet_data *sd;
	unsigned long flags;
1381

1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393
	local_irq_save(flags);
	sd = &__get_cpu_var(softnet_data);
	q->next_sched = sd->output_queue;
	sd->output_queue = q;
	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	local_irq_restore(flags);
}

void __netif_schedule(struct Qdisc *q)
{
	if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
		__netif_reschedule(q);
1394 1395 1396
}
EXPORT_SYMBOL(__netif_schedule);

1397
void dev_kfree_skb_irq(struct sk_buff *skb)
1398
{
1399 1400 1401
	if (atomic_dec_and_test(&skb->users)) {
		struct softnet_data *sd;
		unsigned long flags;
1402

1403 1404 1405 1406 1407 1408 1409
		local_irq_save(flags);
		sd = &__get_cpu_var(softnet_data);
		skb->next = sd->completion_queue;
		sd->completion_queue = skb;
		raise_softirq_irqoff(NET_TX_SOFTIRQ);
		local_irq_restore(flags);
	}
1410
}
1411
EXPORT_SYMBOL(dev_kfree_skb_irq);
1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422

void dev_kfree_skb_any(struct sk_buff *skb)
{
	if (in_irq() || irqs_disabled())
		dev_kfree_skb_irq(skb);
	else
		dev_kfree_skb(skb);
}
EXPORT_SYMBOL(dev_kfree_skb_any);


1423 1424 1425 1426 1427 1428
/**
 * netif_device_detach - mark device as removed
 * @dev: network device
 *
 * Mark device as removed from system and therefore no longer available.
 */
1429 1430 1431 1432 1433 1434 1435 1436 1437
void netif_device_detach(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
		netif_stop_queue(dev);
	}
}
EXPORT_SYMBOL(netif_device_detach);

1438 1439 1440 1441 1442 1443
/**
 * netif_device_attach - mark device as attached
 * @dev: network device
 *
 * Mark device as attached from system and restart if needed.
 */
1444 1445 1446 1447 1448
void netif_device_attach(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
		netif_wake_queue(dev);
1449
		__netdev_watchdog_up(dev);
1450 1451 1452 1453
	}
}
EXPORT_SYMBOL(netif_device_attach);

1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476
static bool can_checksum_protocol(unsigned long features, __be16 protocol)
{
	return ((features & NETIF_F_GEN_CSUM) ||
		((features & NETIF_F_IP_CSUM) &&
		 protocol == htons(ETH_P_IP)) ||
		((features & NETIF_F_IPV6_CSUM) &&
		 protocol == htons(ETH_P_IPV6)));
}

static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
{
	if (can_checksum_protocol(dev->features, skb->protocol))
		return true;

	if (skb->protocol == htons(ETH_P_8021Q)) {
		struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
		if (can_checksum_protocol(dev->features & dev->vlan_features,
					  veh->h_vlan_encapsulated_proto))
			return true;
	}

	return false;
}
1477

L
Linus Torvalds 已提交
1478 1479 1480 1481
/*
 * Invalidate hardware checksum when packet is to be mangled, and
 * complete checksum manually on outgoing path.
 */
1482
int skb_checksum_help(struct sk_buff *skb)
L
Linus Torvalds 已提交
1483
{
1484
	__wsum csum;
1485
	int ret = 0, offset;
L
Linus Torvalds 已提交
1486

1487
	if (skb->ip_summed == CHECKSUM_COMPLETE)
1488 1489 1490 1491 1492
		goto out_set_summed;

	if (unlikely(skb_shinfo(skb)->gso_size)) {
		/* Let GSO fix up the checksum. */
		goto out_set_summed;
L
Linus Torvalds 已提交
1493 1494
	}

1495 1496 1497 1498 1499 1500 1501 1502 1503
	offset = skb->csum_start - skb_headroom(skb);
	BUG_ON(offset >= skb_headlen(skb));
	csum = skb_checksum(skb, offset, skb->len - offset, 0);

	offset += skb->csum_offset;
	BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));

	if (skb_cloned(skb) &&
	    !skb_clone_writable(skb, offset + sizeof(__sum16))) {
L
Linus Torvalds 已提交
1504 1505 1506 1507 1508
		ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
		if (ret)
			goto out;
	}

1509
	*(__sum16 *)(skb->data + offset) = csum_fold(csum);
1510
out_set_summed:
L
Linus Torvalds 已提交
1511
	skb->ip_summed = CHECKSUM_NONE;
1512
out:
L
Linus Torvalds 已提交
1513 1514 1515
	return ret;
}

1516 1517 1518
/**
 *	skb_gso_segment - Perform segmentation on skb.
 *	@skb: buffer to segment
1519
 *	@features: features for the output path (see dev->features)
1520 1521
 *
 *	This function segments the given skb and returns a list of segments.
1522 1523 1524
 *
 *	It may return NULL if the skb requires no segmentation.  This is
 *	only possible when GSO is used for verifying header integrity.
1525
 */
1526
struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1527 1528 1529
{
	struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
	struct packet_type *ptype;
A
Al Viro 已提交
1530
	__be16 type = skb->protocol;
1531
	int err;
1532

1533
	skb_reset_mac_header(skb);
1534
	skb->mac_len = skb->network_header - skb->mac_header;
1535 1536
	__skb_pull(skb, skb->mac_len);

1537
	if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) {
1538 1539 1540 1541 1542
		if (skb_header_cloned(skb) &&
		    (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
			return ERR_PTR(err);
	}

1543
	rcu_read_lock();
1544 1545
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1546
		if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1547
			if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1548 1549 1550 1551
				err = ptype->gso_send_check(skb);
				segs = ERR_PTR(err);
				if (err || skb_gso_ok(skb, features))
					break;
1552 1553
				__skb_push(skb, (skb->data -
						 skb_network_header(skb)));
1554
			}
1555
			segs = ptype->gso_segment(skb, features);
1556 1557 1558 1559 1560
			break;
		}
	}
	rcu_read_unlock();

1561
	__skb_push(skb, skb->data - skb_mac_header(skb));
1562

1563 1564 1565 1566 1567
	return segs;
}

EXPORT_SYMBOL(skb_gso_segment);

1568 1569 1570 1571 1572
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG
void netdev_rx_csum_fault(struct net_device *dev)
{
	if (net_ratelimit()) {
1573
		printk(KERN_ERR "%s: hw csum failure.\n",
1574
			dev ? dev->name : "<unknown>");
1575 1576 1577 1578 1579 1580
		dump_stack();
	}
}
EXPORT_SYMBOL(netdev_rx_csum_fault);
#endif

L
Linus Torvalds 已提交
1581 1582 1583 1584 1585 1586 1587
/* Actually, we should eliminate this check as soon as we know, that:
 * 1. IOMMU is present and allows to map all the memory.
 * 2. No high memory really exists on this machine.
 */

static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
{
1588
#ifdef CONFIG_HIGHMEM
L
Linus Torvalds 已提交
1589 1590 1591 1592 1593 1594 1595 1596 1597
	int i;

	if (dev->features & NETIF_F_HIGHDMA)
		return 0;

	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
		if (PageHighMem(skb_shinfo(skb)->frags[i].page))
			return 1;

1598
#endif
L
Linus Torvalds 已提交
1599 1600 1601
	return 0;
}

1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635
struct dev_gso_cb {
	void (*destructor)(struct sk_buff *skb);
};

#define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)

static void dev_gso_skb_destructor(struct sk_buff *skb)
{
	struct dev_gso_cb *cb;

	do {
		struct sk_buff *nskb = skb->next;

		skb->next = nskb->next;
		nskb->next = NULL;
		kfree_skb(nskb);
	} while (skb->next);

	cb = DEV_GSO_CB(skb);
	if (cb->destructor)
		cb->destructor(skb);
}

/**
 *	dev_gso_segment - Perform emulated hardware segmentation on skb.
 *	@skb: buffer to segment
 *
 *	This function segments the given skb and stores the list of segments
 *	in skb->next.
 */
static int dev_gso_segment(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	struct sk_buff *segs;
1636 1637 1638 1639 1640 1641 1642 1643
	int features = dev->features & ~(illegal_highdma(dev, skb) ?
					 NETIF_F_SG : 0);

	segs = skb_gso_segment(skb, features);

	/* Verifying header integrity only. */
	if (!segs)
		return 0;
1644

1645
	if (IS_ERR(segs))
1646 1647 1648 1649 1650 1651 1652 1653 1654
		return PTR_ERR(segs);

	skb->next = segs;
	DEV_GSO_CB(skb)->destructor = skb->destructor;
	skb->destructor = dev_gso_skb_destructor;

	return 0;
}

1655 1656
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
			struct netdev_queue *txq)
1657
{
1658 1659 1660
	const struct net_device_ops *ops = dev->netdev_ops;

	prefetch(&dev->netdev_ops->ndo_start_xmit);
1661
	if (likely(!skb->next)) {
S
Stephen Hemminger 已提交
1662
		if (!list_empty(&ptype_all))
1663 1664
			dev_queue_xmit_nit(skb, dev);

1665 1666 1667 1668 1669 1670
		if (netif_needs_gso(dev, skb)) {
			if (unlikely(dev_gso_segment(skb)))
				goto out_kfree_skb;
			if (skb->next)
				goto gso;
		}
1671

1672
		return ops->ndo_start_xmit(skb, dev);
1673 1674
	}

1675
gso:
1676 1677 1678 1679 1680 1681
	do {
		struct sk_buff *nskb = skb->next;
		int rc;

		skb->next = nskb->next;
		nskb->next = NULL;
1682
		rc = ops->ndo_start_xmit(nskb, dev);
1683
		if (unlikely(rc)) {
1684
			nskb->next = skb->next;
1685 1686 1687
			skb->next = nskb;
			return rc;
		}
1688
		if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1689
			return NETDEV_TX_BUSY;
1690
	} while (skb->next);
1691

1692 1693 1694 1695 1696 1697 1698
	skb->destructor = DEV_GSO_CB(skb)->destructor;

out_kfree_skb:
	kfree_skb(skb);
	return 0;
}

D
David S. Miller 已提交
1699 1700 1701
static u32 simple_tx_hashrnd;
static int simple_tx_hashrnd_initialized = 0;

1702 1703
static u16 simple_tx_hash(struct net_device *dev, struct sk_buff *skb)
{
D
David S. Miller 已提交
1704 1705
	u32 addr1, addr2, ports;
	u32 hash, ihl;
1706
	u8 ip_proto = 0;
D
David S. Miller 已提交
1707 1708 1709 1710 1711

	if (unlikely(!simple_tx_hashrnd_initialized)) {
		get_random_bytes(&simple_tx_hashrnd, 4);
		simple_tx_hashrnd_initialized = 1;
	}
1712 1713

	switch (skb->protocol) {
1714
	case htons(ETH_P_IP):
1715 1716
		if (!(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)))
			ip_proto = ip_hdr(skb)->protocol;
D
David S. Miller 已提交
1717 1718
		addr1 = ip_hdr(skb)->saddr;
		addr2 = ip_hdr(skb)->daddr;
1719 1720
		ihl = ip_hdr(skb)->ihl;
		break;
1721
	case htons(ETH_P_IPV6):
1722
		ip_proto = ipv6_hdr(skb)->nexthdr;
D
David S. Miller 已提交
1723 1724
		addr1 = ipv6_hdr(skb)->saddr.s6_addr32[3];
		addr2 = ipv6_hdr(skb)->daddr.s6_addr32[3];
1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739
		ihl = (40 >> 2);
		break;
	default:
		return 0;
	}


	switch (ip_proto) {
	case IPPROTO_TCP:
	case IPPROTO_UDP:
	case IPPROTO_DCCP:
	case IPPROTO_ESP:
	case IPPROTO_AH:
	case IPPROTO_SCTP:
	case IPPROTO_UDPLITE:
D
David S. Miller 已提交
1740
		ports = *((u32 *) (skb_network_header(skb) + (ihl * 4)));
1741 1742 1743
		break;

	default:
D
David S. Miller 已提交
1744
		ports = 0;
1745 1746 1747
		break;
	}

D
David S. Miller 已提交
1748 1749 1750
	hash = jhash_3words(addr1, addr2, ports, simple_tx_hashrnd);

	return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1751 1752
}

1753 1754 1755
static struct netdev_queue *dev_pick_tx(struct net_device *dev,
					struct sk_buff *skb)
{
1756
	const struct net_device_ops *ops = dev->netdev_ops;
1757 1758
	u16 queue_index = 0;

1759 1760
	if (ops->ndo_select_queue)
		queue_index = ops->ndo_select_queue(dev, skb);
1761 1762
	else if (dev->real_num_tx_queues > 1)
		queue_index = simple_tx_hash(dev, skb);
1763

1764 1765
	skb_set_queue_mapping(skb, queue_index);
	return netdev_get_tx_queue(dev, queue_index);
1766 1767
}

1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792
/**
 *	dev_queue_xmit - transmit a buffer
 *	@skb: buffer to transmit
 *
 *	Queue a buffer for transmission to a network device. The caller must
 *	have set the device and priority and built the buffer before calling
 *	this function. The function can be called from an interrupt.
 *
 *	A negative errno code is returned on a failure. A success does not
 *	guarantee the frame will be transmitted as it may be dropped due
 *	to congestion or traffic shaping.
 *
 * -----------------------------------------------------------------------------------
 *      I notice this method can also return errors from the queue disciplines,
 *      including NET_XMIT_DROP, which is a positive value.  So, errors can also
 *      be positive.
 *
 *      Regardless of the return value, the skb is consumed, so it is currently
 *      difficult to retry a send to this method.  (You can bump the ref count
 *      before sending to hold a reference for retry if you are careful.)
 *
 *      When calling this method, interrupts MUST be enabled.  This is because
 *      the BH enable code must have IRQs enabled so that it will not deadlock.
 *          --BLG
 */
L
Linus Torvalds 已提交
1793 1794 1795
int dev_queue_xmit(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
1796
	struct netdev_queue *txq;
L
Linus Torvalds 已提交
1797 1798 1799
	struct Qdisc *q;
	int rc = -ENOMEM;

1800 1801 1802 1803
	/* GSO will handle the following emulations directly. */
	if (netif_needs_gso(dev, skb))
		goto gso;

L
Linus Torvalds 已提交
1804 1805
	if (skb_shinfo(skb)->frag_list &&
	    !(dev->features & NETIF_F_FRAGLIST) &&
H
Herbert Xu 已提交
1806
	    __skb_linearize(skb))
L
Linus Torvalds 已提交
1807 1808 1809 1810 1811 1812 1813 1814
		goto out_kfree_skb;

	/* Fragmented skb is linearized if device does not support SG,
	 * or if at least one of fragments is in highmem and device
	 * does not support DMA from it.
	 */
	if (skb_shinfo(skb)->nr_frags &&
	    (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
H
Herbert Xu 已提交
1815
	    __skb_linearize(skb))
L
Linus Torvalds 已提交
1816 1817 1818 1819 1820
		goto out_kfree_skb;

	/* If packet is not checksummed and device does not support
	 * checksumming for this protocol, complete checksumming here.
	 */
1821 1822 1823
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
		skb_set_transport_header(skb, skb->csum_start -
					      skb_headroom(skb));
1824 1825
		if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
			goto out_kfree_skb;
1826
	}
L
Linus Torvalds 已提交
1827

1828
gso:
1829 1830
	/* Disable soft irqs for various locks below. Also
	 * stops preemption for RCU.
L
Linus Torvalds 已提交
1831
	 */
1832
	rcu_read_lock_bh();
L
Linus Torvalds 已提交
1833

1834
	txq = dev_pick_tx(dev, skb);
1835
	q = rcu_dereference(txq->qdisc);
1836

L
Linus Torvalds 已提交
1837 1838 1839 1840
#ifdef CONFIG_NET_CLS_ACT
	skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
#endif
	if (q->enqueue) {
1841
		spinlock_t *root_lock = qdisc_lock(q);
1842 1843 1844

		spin_lock(root_lock);

1845
		if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
1846
			kfree_skb(skb);
1847
			rc = NET_XMIT_DROP;
1848 1849 1850
		} else {
			rc = qdisc_enqueue_root(skb, q);
			qdisc_run(q);
1851
		}
1852 1853 1854
		spin_unlock(root_lock);

		goto out;
L
Linus Torvalds 已提交
1855 1856 1857 1858 1859
	}

	/* The device has no queue. Common case for software devices:
	   loopback, all the sorts of tunnels...

H
Herbert Xu 已提交
1860 1861
	   Really, it is unlikely that netif_tx_lock protection is necessary
	   here.  (f.e. loopback and IP tunnels are clean ignoring statistics
L
Linus Torvalds 已提交
1862 1863 1864 1865 1866 1867 1868 1869 1870 1871
	   counters.)
	   However, it is possible, that they rely on protection
	   made by us here.

	   Check this and shot the lock. It is not prone from deadlocks.
	   Either shot noqueue qdisc, it is even simpler 8)
	 */
	if (dev->flags & IFF_UP) {
		int cpu = smp_processor_id(); /* ok because BHs are off */

1872
		if (txq->xmit_lock_owner != cpu) {
L
Linus Torvalds 已提交
1873

1874
			HARD_TX_LOCK(dev, txq, cpu);
L
Linus Torvalds 已提交
1875

1876
			if (!netif_tx_queue_stopped(txq)) {
L
Linus Torvalds 已提交
1877
				rc = 0;
1878
				if (!dev_hard_start_xmit(skb, dev, txq)) {
1879
					HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
1880 1881 1882
					goto out;
				}
			}
1883
			HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896
			if (net_ratelimit())
				printk(KERN_CRIT "Virtual device %s asks to "
				       "queue packet!\n", dev->name);
		} else {
			/* Recursion is detected! It is possible,
			 * unfortunately */
			if (net_ratelimit())
				printk(KERN_CRIT "Dead loop on virtual device "
				       "%s, fix it urgently!\n", dev->name);
		}
	}

	rc = -ENETDOWN;
1897
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
1898 1899 1900 1901 1902

out_kfree_skb:
	kfree_skb(skb);
	return rc;
out:
1903
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
1904 1905 1906 1907 1908 1909 1910 1911
	return rc;
}


/*=======================================================================
			Receiver routines
  =======================================================================*/

1912 1913 1914
int netdev_max_backlog __read_mostly = 1000;
int netdev_budget __read_mostly = 300;
int weight_p __read_mostly = 64;            /* old backlog weight */
L
Linus Torvalds 已提交
1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942

DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };


/**
 *	netif_rx	-	post buffer to the network code
 *	@skb: buffer to post
 *
 *	This function receives a packet from a device driver and queues it for
 *	the upper (protocol) levels to process.  It always succeeds. The buffer
 *	may be dropped during processing for congestion control or by the
 *	protocol layers.
 *
 *	return values:
 *	NET_RX_SUCCESS	(no congestion)
 *	NET_RX_DROP     (packet was dropped)
 *
 */

int netif_rx(struct sk_buff *skb)
{
	struct softnet_data *queue;
	unsigned long flags;

	/* if netpoll wants it, pretend we never saw it */
	if (netpoll_rx(skb))
		return NET_RX_DROP;

1943
	if (!skb->tstamp.tv64)
1944
		net_timestamp(skb);
L
Linus Torvalds 已提交
1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958

	/*
	 * The code is rearranged so that the path is the most
	 * short when CPU is congested, but is still operating.
	 */
	local_irq_save(flags);
	queue = &__get_cpu_var(softnet_data);

	__get_cpu_var(netdev_rx_stat).total++;
	if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
		if (queue->input_pkt_queue.qlen) {
enqueue:
			__skb_queue_tail(&queue->input_pkt_queue, skb);
			local_irq_restore(flags);
1959
			return NET_RX_SUCCESS;
L
Linus Torvalds 已提交
1960 1961
		}

1962
		napi_schedule(&queue->backlog);
L
Linus Torvalds 已提交
1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
		goto enqueue;
	}

	__get_cpu_var(netdev_rx_stat).dropped++;
	local_irq_restore(flags);

	kfree_skb(skb);
	return NET_RX_DROP;
}

int netif_rx_ni(struct sk_buff *skb)
{
	int err;

	preempt_disable();
	err = netif_rx(skb);
	if (local_softirq_pending())
		do_softirq();
	preempt_enable();

	return err;
}

EXPORT_SYMBOL(netif_rx_ni);

static void net_tx_action(struct softirq_action *h)
{
	struct softnet_data *sd = &__get_cpu_var(softnet_data);

	if (sd->completion_queue) {
		struct sk_buff *clist;

		local_irq_disable();
		clist = sd->completion_queue;
		sd->completion_queue = NULL;
		local_irq_enable();

		while (clist) {
			struct sk_buff *skb = clist;
			clist = clist->next;

2004
			WARN_ON(atomic_read(&skb->users));
L
Linus Torvalds 已提交
2005 2006 2007 2008 2009
			__kfree_skb(skb);
		}
	}

	if (sd->output_queue) {
2010
		struct Qdisc *head;
L
Linus Torvalds 已提交
2011 2012 2013 2014 2015 2016 2017

		local_irq_disable();
		head = sd->output_queue;
		sd->output_queue = NULL;
		local_irq_enable();

		while (head) {
2018 2019 2020
			struct Qdisc *q = head;
			spinlock_t *root_lock;

L
Linus Torvalds 已提交
2021 2022
			head = head->next_sched;

2023
			root_lock = qdisc_lock(q);
2024
			if (spin_trylock(root_lock)) {
2025 2026 2027
				smp_mb__before_clear_bit();
				clear_bit(__QDISC_STATE_SCHED,
					  &q->state);
2028 2029
				qdisc_run(q);
				spin_unlock(root_lock);
L
Linus Torvalds 已提交
2030
			} else {
2031
				if (!test_bit(__QDISC_STATE_DEACTIVATED,
2032
					      &q->state)) {
2033
					__netif_reschedule(q);
2034 2035 2036 2037 2038
				} else {
					smp_mb__before_clear_bit();
					clear_bit(__QDISC_STATE_SCHED,
						  &q->state);
				}
L
Linus Torvalds 已提交
2039 2040 2041 2042 2043
			}
		}
	}
}

2044 2045 2046
static inline int deliver_skb(struct sk_buff *skb,
			      struct packet_type *pt_prev,
			      struct net_device *orig_dev)
L
Linus Torvalds 已提交
2047 2048
{
	atomic_inc(&skb->users);
D
David S. Miller 已提交
2049
	return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2050 2051 2052
}

#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2053
/* These hooks defined here for ATM */
L
Linus Torvalds 已提交
2054 2055 2056
struct net_bridge;
struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
						unsigned char *addr);
2057
void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
L
Linus Torvalds 已提交
2058

2059 2060 2061 2062 2063 2064 2065 2066 2067
/*
 * If bridge module is loaded call bridging hook.
 *  returns NULL if packet was consumed.
 */
struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
					struct sk_buff *skb) __read_mostly;
static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
					    struct packet_type **pt_prev, int *ret,
					    struct net_device *orig_dev)
L
Linus Torvalds 已提交
2068 2069 2070
{
	struct net_bridge_port *port;

2071 2072 2073
	if (skb->pkt_type == PACKET_LOOPBACK ||
	    (port = rcu_dereference(skb->dev->br_port)) == NULL)
		return skb;
L
Linus Torvalds 已提交
2074 2075

	if (*pt_prev) {
2076
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
L
Linus Torvalds 已提交
2077
		*pt_prev = NULL;
2078 2079
	}

2080
	return br_handle_frame_hook(port, skb);
L
Linus Torvalds 已提交
2081 2082
}
#else
2083
#define handle_bridge(skb, pt_prev, ret, orig_dev)	(skb)
L
Linus Torvalds 已提交
2084 2085
#endif

P
Patrick McHardy 已提交
2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107
#if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);

static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
					     struct packet_type **pt_prev,
					     int *ret,
					     struct net_device *orig_dev)
{
	if (skb->dev->macvlan_port == NULL)
		return skb;

	if (*pt_prev) {
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
		*pt_prev = NULL;
	}
	return macvlan_handle_frame_hook(skb);
}
#else
#define handle_macvlan(skb, pt_prev, ret, orig_dev)	(skb)
#endif

L
Linus Torvalds 已提交
2108 2109 2110 2111 2112
#ifdef CONFIG_NET_CLS_ACT
/* TODO: Maybe we should just force sch_ingress to be compiled in
 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
 * a compare and 2 stores extra right now if we dont have it on
 * but have CONFIG_NET_CLS_ACT
2113
 * NOTE: This doesnt stop any functionality; if you dont have
L
Linus Torvalds 已提交
2114 2115 2116
 * the ingress scheduler, you just cant add policies on ingress.
 *
 */
2117
static int ing_filter(struct sk_buff *skb)
L
Linus Torvalds 已提交
2118 2119
{
	struct net_device *dev = skb->dev;
2120
	u32 ttl = G_TC_RTTL(skb->tc_verd);
2121 2122 2123
	struct netdev_queue *rxq;
	int result = TC_ACT_OK;
	struct Qdisc *q;
2124

2125 2126 2127 2128 2129 2130
	if (MAX_RED_LOOP < ttl++) {
		printk(KERN_WARNING
		       "Redir loop detected Dropping packet (%d->%d)\n",
		       skb->iif, dev->ifindex);
		return TC_ACT_SHOT;
	}
L
Linus Torvalds 已提交
2131

2132 2133
	skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
	skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
L
Linus Torvalds 已提交
2134

2135 2136
	rxq = &dev->rx_queue;

2137
	q = rxq->qdisc;
2138
	if (q != &noop_qdisc) {
2139
		spin_lock(qdisc_lock(q));
2140 2141
		if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
			result = qdisc_enqueue_root(skb, q);
2142 2143
		spin_unlock(qdisc_lock(q));
	}
2144 2145 2146

	return result;
}
2147

2148 2149 2150 2151
static inline struct sk_buff *handle_ing(struct sk_buff *skb,
					 struct packet_type **pt_prev,
					 int *ret, struct net_device *orig_dev)
{
2152
	if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2153
		goto out;
L
Linus Torvalds 已提交
2154

2155 2156 2157 2158 2159 2160
	if (*pt_prev) {
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
		*pt_prev = NULL;
	} else {
		/* Huh? Why does turning on AF_PACKET affect this? */
		skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
L
Linus Torvalds 已提交
2161 2162
	}

2163 2164 2165 2166 2167 2168 2169 2170 2171 2172
	switch (ing_filter(skb)) {
	case TC_ACT_SHOT:
	case TC_ACT_STOLEN:
		kfree_skb(skb);
		return NULL;
	}

out:
	skb->tc_verd = 0;
	return skb;
L
Linus Torvalds 已提交
2173 2174 2175
}
#endif

2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202
/*
 * 	netif_nit_deliver - deliver received packets to network taps
 * 	@skb: buffer
 *
 * 	This function is used to deliver incoming packets to network
 * 	taps. It should be used when the normal netif_receive_skb path
 * 	is bypassed, for example because of VLAN acceleration.
 */
void netif_nit_deliver(struct sk_buff *skb)
{
	struct packet_type *ptype;

	if (list_empty(&ptype_all))
		return;

	skb_reset_network_header(skb);
	skb_reset_transport_header(skb);
	skb->mac_len = skb->network_header - skb->mac_header;

	rcu_read_lock();
	list_for_each_entry_rcu(ptype, &ptype_all, list) {
		if (!ptype->dev || ptype->dev == skb->dev)
			deliver_skb(skb, ptype, skb->dev);
	}
	rcu_read_unlock();
}

2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217
/**
 *	netif_receive_skb - process receive buffer from network
 *	@skb: buffer to process
 *
 *	netif_receive_skb() is the main receive data processing function.
 *	It always succeeds. The buffer may be dropped during processing
 *	for congestion control or by the protocol layers.
 *
 *	This function may only be called from softirq context and interrupts
 *	should be enabled.
 *
 *	Return values (usually ignored):
 *	NET_RX_SUCCESS: no congestion
 *	NET_RX_DROP: packet was dropped
 */
L
Linus Torvalds 已提交
2218 2219 2220
int netif_receive_skb(struct sk_buff *skb)
{
	struct packet_type *ptype, *pt_prev;
D
David S. Miller 已提交
2221
	struct net_device *orig_dev;
2222
	struct net_device *null_or_orig;
L
Linus Torvalds 已提交
2223
	int ret = NET_RX_DROP;
A
Al Viro 已提交
2224
	__be16 type;
L
Linus Torvalds 已提交
2225

2226 2227 2228
	if (skb->vlan_tci && vlan_hwaccel_do_receive(skb))
		return NET_RX_SUCCESS;

L
Linus Torvalds 已提交
2229
	/* if we've gotten here through NAPI, check netpoll */
2230
	if (netpoll_receive_skb(skb))
L
Linus Torvalds 已提交
2231 2232
		return NET_RX_DROP;

2233
	if (!skb->tstamp.tv64)
2234
		net_timestamp(skb);
L
Linus Torvalds 已提交
2235

2236 2237
	if (!skb->iif)
		skb->iif = skb->dev->ifindex;
2238

2239
	null_or_orig = NULL;
J
Joe Eykholt 已提交
2240 2241
	orig_dev = skb->dev;
	if (orig_dev->master) {
2242 2243 2244 2245
		if (skb_bond_should_drop(skb))
			null_or_orig = orig_dev; /* deliver only exact match */
		else
			skb->dev = orig_dev->master;
J
Joe Eykholt 已提交
2246
	}
2247

L
Linus Torvalds 已提交
2248 2249
	__get_cpu_var(netdev_rx_stat).total++;

2250
	skb_reset_network_header(skb);
2251
	skb_reset_transport_header(skb);
2252
	skb->mac_len = skb->network_header - skb->mac_header;
L
Linus Torvalds 已提交
2253 2254 2255 2256 2257

	pt_prev = NULL;

	rcu_read_lock();

2258
	/* Don't receive packets in an exiting network namespace */
2259 2260
	if (!net_alive(dev_net(skb->dev))) {
		kfree_skb(skb);
2261
		goto out;
2262
	}
2263

L
Linus Torvalds 已提交
2264 2265 2266 2267 2268 2269 2270 2271
#ifdef CONFIG_NET_CLS_ACT
	if (skb->tc_verd & TC_NCLS) {
		skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
		goto ncls;
	}
#endif

	list_for_each_entry_rcu(ptype, &ptype_all, list) {
2272 2273
		if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
		    ptype->dev == orig_dev) {
2274
			if (pt_prev)
D
David S. Miller 已提交
2275
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2276 2277 2278 2279 2280
			pt_prev = ptype;
		}
	}

#ifdef CONFIG_NET_CLS_ACT
2281 2282
	skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
	if (!skb)
L
Linus Torvalds 已提交
2283 2284 2285 2286
		goto out;
ncls:
#endif

2287
	skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
P
Patrick McHardy 已提交
2288 2289 2290
	if (!skb)
		goto out;
	skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2291
	if (!skb)
L
Linus Torvalds 已提交
2292 2293 2294
		goto out;

	type = skb->protocol;
2295 2296
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
L
Linus Torvalds 已提交
2297
		if (ptype->type == type &&
2298 2299
		    (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
		     ptype->dev == orig_dev)) {
2300
			if (pt_prev)
D
David S. Miller 已提交
2301
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2302 2303 2304 2305 2306
			pt_prev = ptype;
		}
	}

	if (pt_prev) {
D
David S. Miller 已提交
2307
		ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320
	} else {
		kfree_skb(skb);
		/* Jamal, now you will not able to escape explaining
		 * me how you were going to use this. :-)
		 */
		ret = NET_RX_DROP;
	}

out:
	rcu_read_unlock();
	return ret;
}

2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334
/* Network device is going away, flush any packets still pending  */
static void flush_backlog(void *arg)
{
	struct net_device *dev = arg;
	struct softnet_data *queue = &__get_cpu_var(softnet_data);
	struct sk_buff *skb, *tmp;

	skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp)
		if (skb->dev == dev) {
			__skb_unlink(skb, &queue->input_pkt_queue);
			kfree_skb(skb);
		}
}

2335 2336 2337 2338 2339 2340 2341
static int napi_gro_complete(struct sk_buff *skb)
{
	struct packet_type *ptype;
	__be16 type = skb->protocol;
	struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
	int err = -ENOENT;

H
Herbert Xu 已提交
2342
	if (NAPI_GRO_CB(skb)->count == 1)
2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361
		goto out;

	rcu_read_lock();
	list_for_each_entry_rcu(ptype, head, list) {
		if (ptype->type != type || ptype->dev || !ptype->gro_complete)
			continue;

		err = ptype->gro_complete(skb);
		break;
	}
	rcu_read_unlock();

	if (err) {
		WARN_ON(&ptype->list == head);
		kfree_skb(skb);
		return NET_RX_SUCCESS;
	}

out:
H
Herbert Xu 已提交
2362
	skb_shinfo(skb)->gso_size = 0;
2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380
	__skb_push(skb, -skb_network_offset(skb));
	return netif_receive_skb(skb);
}

void napi_gro_flush(struct napi_struct *napi)
{
	struct sk_buff *skb, *next;

	for (skb = napi->gro_list; skb; skb = next) {
		next = skb->next;
		skb->next = NULL;
		napi_gro_complete(skb);
	}

	napi->gro_list = NULL;
}
EXPORT_SYMBOL(napi_gro_flush);

2381
int dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2382 2383 2384 2385 2386 2387
{
	struct sk_buff **pp = NULL;
	struct packet_type *ptype;
	__be16 type = skb->protocol;
	struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
	int count = 0;
H
Herbert Xu 已提交
2388
	int same_flow;
2389
	int mac_len;
H
Herbert Xu 已提交
2390
	int free;
2391 2392 2393 2394

	if (!(skb->dev->features & NETIF_F_GRO))
		goto normal;

2395 2396 2397
	if (skb_is_gso(skb) || skb_shinfo(skb)->frag_list)
		goto normal;

2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409
	rcu_read_lock();
	list_for_each_entry_rcu(ptype, head, list) {
		struct sk_buff *p;

		if (ptype->type != type || ptype->dev || !ptype->gro_receive)
			continue;

		skb_reset_network_header(skb);
		mac_len = skb->network_header - skb->mac_header;
		skb->mac_len = mac_len;
		NAPI_GRO_CB(skb)->same_flow = 0;
		NAPI_GRO_CB(skb)->flush = 0;
H
Herbert Xu 已提交
2410
		NAPI_GRO_CB(skb)->free = 0;
2411 2412 2413

		for (p = napi->gro_list; p; p = p->next) {
			count++;
2414 2415 2416 2417 2418 2419 2420 2421

			if (!NAPI_GRO_CB(p)->same_flow)
				continue;

			if (p->mac_len != mac_len ||
			    memcmp(skb_mac_header(p), skb_mac_header(skb),
				   mac_len))
				NAPI_GRO_CB(p)->same_flow = 0;
2422 2423 2424 2425 2426 2427 2428 2429 2430 2431
		}

		pp = ptype->gro_receive(&napi->gro_list, skb);
		break;
	}
	rcu_read_unlock();

	if (&ptype->list == head)
		goto normal;

H
Herbert Xu 已提交
2432
	same_flow = NAPI_GRO_CB(skb)->same_flow;
H
Herbert Xu 已提交
2433
	free = NAPI_GRO_CB(skb)->free;
H
Herbert Xu 已提交
2434

2435 2436 2437 2438 2439 2440 2441 2442 2443
	if (pp) {
		struct sk_buff *nskb = *pp;

		*pp = nskb->next;
		nskb->next = NULL;
		napi_gro_complete(nskb);
		count--;
	}

H
Herbert Xu 已提交
2444
	if (same_flow)
2445 2446 2447 2448 2449 2450 2451 2452
		goto ok;

	if (NAPI_GRO_CB(skb)->flush || count >= MAX_GRO_SKBS) {
		__skb_push(skb, -skb_network_offset(skb));
		goto normal;
	}

	NAPI_GRO_CB(skb)->count = 1;
H
Herbert Xu 已提交
2453
	skb_shinfo(skb)->gso_size = skb->len;
2454 2455 2456 2457
	skb->next = napi->gro_list;
	napi->gro_list = skb;

ok:
H
Herbert Xu 已提交
2458
	return free;
2459 2460

normal:
H
Herbert Xu 已提交
2461 2462
	return -1;
}
2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475
EXPORT_SYMBOL(dev_gro_receive);

static int __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
	struct sk_buff *p;

	for (p = napi->gro_list; p; p = p->next) {
		NAPI_GRO_CB(p)->same_flow = 1;
		NAPI_GRO_CB(p)->flush = 0;
	}

	return dev_gro_receive(napi, skb);
}
H
Herbert Xu 已提交
2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488

int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
{
	switch (__napi_gro_receive(napi, skb)) {
	case -1:
		return netif_receive_skb(skb);

	case 1:
		kfree_skb(skb);
		break;
	}

	return NET_RX_SUCCESS;
2489 2490 2491
}
EXPORT_SYMBOL(napi_gro_receive);

2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508
void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
{
	skb_shinfo(skb)->nr_frags = 0;

	skb->len -= skb->data_len;
	skb->truesize -= skb->data_len;
	skb->data_len = 0;

	__skb_pull(skb, skb_headlen(skb));
	skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));

	napi->skb = skb;
}
EXPORT_SYMBOL(napi_reuse_skb);

struct sk_buff *napi_fraginfo_skb(struct napi_struct *napi,
				  struct napi_gro_fraginfo *info)
H
Herbert Xu 已提交
2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530
{
	struct net_device *dev = napi->dev;
	struct sk_buff *skb = napi->skb;

	napi->skb = NULL;

	if (!skb) {
		skb = netdev_alloc_skb(dev, GRO_MAX_HEAD + NET_IP_ALIGN);
		if (!skb)
			goto out;

		skb_reserve(skb, NET_IP_ALIGN);
	}

	BUG_ON(info->nr_frags > MAX_SKB_FRAGS);
	skb_shinfo(skb)->nr_frags = info->nr_frags;
	memcpy(skb_shinfo(skb)->frags, info->frags, sizeof(info->frags));

	skb->data_len = info->len;
	skb->len += info->len;
	skb->truesize += info->len;

2531 2532 2533 2534
	if (!pskb_may_pull(skb, ETH_HLEN)) {
		napi_reuse_skb(napi, skb);
		goto out;
	}
H
Herbert Xu 已提交
2535 2536 2537 2538 2539 2540

	skb->protocol = eth_type_trans(skb, dev);

	skb->ip_summed = info->ip_summed;
	skb->csum = info->csum;

2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555
out:
	return skb;
}
EXPORT_SYMBOL(napi_fraginfo_skb);

int napi_gro_frags(struct napi_struct *napi, struct napi_gro_fraginfo *info)
{
	struct sk_buff *skb = napi_fraginfo_skb(napi, info);
	int err = NET_RX_DROP;

	if (!skb)
		goto out;

	err = NET_RX_SUCCESS;

H
Herbert Xu 已提交
2556 2557 2558 2559 2560 2561 2562 2563
	switch (__napi_gro_receive(napi, skb)) {
	case -1:
		return netif_receive_skb(skb);

	case 0:
		goto out;
	}

2564
	napi_reuse_skb(napi, skb);
H
Herbert Xu 已提交
2565 2566 2567 2568 2569 2570

out:
	return err;
}
EXPORT_SYMBOL(napi_gro_frags);

2571
static int process_backlog(struct napi_struct *napi, int quota)
L
Linus Torvalds 已提交
2572 2573 2574 2575 2576
{
	int work = 0;
	struct softnet_data *queue = &__get_cpu_var(softnet_data);
	unsigned long start_time = jiffies;

2577 2578
	napi->weight = weight_p;
	do {
L
Linus Torvalds 已提交
2579 2580 2581 2582
		struct sk_buff *skb;

		local_irq_disable();
		skb = __skb_dequeue(&queue->input_pkt_queue);
2583 2584 2585 2586 2587
		if (!skb) {
			__napi_complete(napi);
			local_irq_enable();
			break;
		}
L
Linus Torvalds 已提交
2588 2589
		local_irq_enable();

2590
		napi_gro_receive(napi, skb);
2591
	} while (++work < quota && jiffies == start_time);
L
Linus Torvalds 已提交
2592

2593 2594
	napi_gro_flush(napi);

2595 2596
	return work;
}
L
Linus Torvalds 已提交
2597

2598 2599
/**
 * __napi_schedule - schedule for receive
2600
 * @n: entry to schedule
2601 2602 2603
 *
 * The entry's receive function will be scheduled to run
 */
H
Harvey Harrison 已提交
2604
void __napi_schedule(struct napi_struct *n)
2605 2606
{
	unsigned long flags;
L
Linus Torvalds 已提交
2607

2608 2609 2610 2611
	local_irq_save(flags);
	list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
	__raise_softirq_irqoff(NET_RX_SOFTIRQ);
	local_irq_restore(flags);
L
Linus Torvalds 已提交
2612
}
2613 2614
EXPORT_SYMBOL(__napi_schedule);

2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648
void __napi_complete(struct napi_struct *n)
{
	BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
	BUG_ON(n->gro_list);

	list_del(&n->poll_list);
	smp_mb__before_clear_bit();
	clear_bit(NAPI_STATE_SCHED, &n->state);
}
EXPORT_SYMBOL(__napi_complete);

void napi_complete(struct napi_struct *n)
{
	unsigned long flags;

	/*
	 * don't let napi dequeue from the cpu poll list
	 * just in case its running on a different cpu
	 */
	if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
		return;

	napi_gro_flush(n);
	local_irq_save(flags);
	__napi_complete(n);
	local_irq_restore(flags);
}
EXPORT_SYMBOL(napi_complete);

void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight)
{
	INIT_LIST_HEAD(&napi->poll_list);
	napi->gro_list = NULL;
H
Herbert Xu 已提交
2649
	napi->skb = NULL;
2650 2651 2652 2653
	napi->poll = poll;
	napi->weight = weight;
	list_add(&napi->dev_list, &dev->napi_list);
	napi->dev = dev;
H
Herbert Xu 已提交
2654
#ifdef CONFIG_NETPOLL
2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665
	spin_lock_init(&napi->poll_lock);
	napi->poll_owner = -1;
#endif
	set_bit(NAPI_STATE_SCHED, &napi->state);
}
EXPORT_SYMBOL(netif_napi_add);

void netif_napi_del(struct napi_struct *napi)
{
	struct sk_buff *skb, *next;

2666
	list_del_init(&napi->dev_list);
H
Herbert Xu 已提交
2667
	kfree(napi->skb);
2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678

	for (skb = napi->gro_list; skb; skb = next) {
		next = skb->next;
		skb->next = NULL;
		kfree_skb(skb);
	}

	napi->gro_list = NULL;
}
EXPORT_SYMBOL(netif_napi_del);

L
Linus Torvalds 已提交
2679 2680 2681

static void net_rx_action(struct softirq_action *h)
{
2682
	struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
2683
	unsigned long time_limit = jiffies + 2;
2684
	int budget = netdev_budget;
2685 2686
	void *have;

L
Linus Torvalds 已提交
2687 2688
	local_irq_disable();

2689 2690 2691
	while (!list_empty(list)) {
		struct napi_struct *n;
		int work, weight;
L
Linus Torvalds 已提交
2692

2693
		/* If softirq window is exhuasted then punt.
2694 2695
		 * Allow this to run for 2 jiffies since which will allow
		 * an average latency of 1.5/HZ.
2696
		 */
2697
		if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
L
Linus Torvalds 已提交
2698 2699 2700 2701
			goto softnet_break;

		local_irq_enable();

2702 2703 2704 2705 2706 2707
		/* Even though interrupts have been re-enabled, this
		 * access is safe because interrupts can only add new
		 * entries to the tail of this list, and only ->poll()
		 * calls can remove this head entry from the list.
		 */
		n = list_entry(list->next, struct napi_struct, poll_list);
L
Linus Torvalds 已提交
2708

2709 2710 2711 2712
		have = netpoll_poll_lock(n);

		weight = n->weight;

2713 2714 2715 2716 2717 2718 2719 2720 2721
		/* This NAPI_STATE_SCHED test is for avoiding a race
		 * with netpoll's poll_napi().  Only the entity which
		 * obtains the lock and sees NAPI_STATE_SCHED set will
		 * actually make the ->poll() call.  Therefore we avoid
		 * accidently calling ->poll() when NAPI is not scheduled.
		 */
		work = 0;
		if (test_bit(NAPI_STATE_SCHED, &n->state))
			work = n->poll(n, weight);
2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733

		WARN_ON_ONCE(work > weight);

		budget -= work;

		local_irq_disable();

		/* Drivers must not modify the NAPI state if they
		 * consume the entire weight.  In such cases this code
		 * still "owns" the NAPI instance and therefore can
		 * move the instance around on the list at-will.
		 */
2734 2735 2736 2737 2738 2739
		if (unlikely(work == weight)) {
			if (unlikely(napi_disable_pending(n)))
				__napi_complete(n);
			else
				list_move_tail(&n->poll_list, list);
		}
2740 2741

		netpoll_poll_unlock(have);
L
Linus Torvalds 已提交
2742 2743
	}
out:
2744
	local_irq_enable();
2745

2746 2747 2748 2749 2750
#ifdef CONFIG_NET_DMA
	/*
	 * There may not be any more sk_buffs coming right now, so push
	 * any pending DMA copies to hardware
	 */
2751
	dma_issue_pending_all();
2752
#endif
2753

L
Linus Torvalds 已提交
2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792
	return;

softnet_break:
	__get_cpu_var(netdev_rx_stat).time_squeeze++;
	__raise_softirq_irqoff(NET_RX_SOFTIRQ);
	goto out;
}

static gifconf_func_t * gifconf_list [NPROTO];

/**
 *	register_gifconf	-	register a SIOCGIF handler
 *	@family: Address family
 *	@gifconf: Function handler
 *
 *	Register protocol dependent address dumping routines. The handler
 *	that is passed must not be freed or reused until it has been replaced
 *	by another handler.
 */
int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
{
	if (family >= NPROTO)
		return -EINVAL;
	gifconf_list[family] = gifconf;
	return 0;
}


/*
 *	Map an interface index to its name (SIOCGIFNAME)
 */

/*
 *	We need this ioctl for efficient implementation of the
 *	if_indextoname() function required by the IPv6 API.  Without
 *	it, we would have to search all the interfaces to find a
 *	match.  --pb
 */

2793
static int dev_ifname(struct net *net, struct ifreq __user *arg)
L
Linus Torvalds 已提交
2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805
{
	struct net_device *dev;
	struct ifreq ifr;

	/*
	 *	Fetch the caller's info block.
	 */

	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
		return -EFAULT;

	read_lock(&dev_base_lock);
2806
	dev = __dev_get_by_index(net, ifr.ifr_ifindex);
L
Linus Torvalds 已提交
2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825
	if (!dev) {
		read_unlock(&dev_base_lock);
		return -ENODEV;
	}

	strcpy(ifr.ifr_name, dev->name);
	read_unlock(&dev_base_lock);

	if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
		return -EFAULT;
	return 0;
}

/*
 *	Perform a SIOCGIFCONF call. This structure will change
 *	size eventually, and there is nothing I can do about it.
 *	Thus we will need a 'compatibility mode'.
 */

2826
static int dev_ifconf(struct net *net, char __user *arg)
L
Linus Torvalds 已提交
2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849
{
	struct ifconf ifc;
	struct net_device *dev;
	char __user *pos;
	int len;
	int total;
	int i;

	/*
	 *	Fetch the caller's info block.
	 */

	if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
		return -EFAULT;

	pos = ifc.ifc_buf;
	len = ifc.ifc_len;

	/*
	 *	Loop over the interfaces, and write an info block for each.
	 */

	total = 0;
2850
	for_each_netdev(net, dev) {
L
Linus Torvalds 已提交
2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863
		for (i = 0; i < NPROTO; i++) {
			if (gifconf_list[i]) {
				int done;
				if (!pos)
					done = gifconf_list[i](dev, NULL, 0);
				else
					done = gifconf_list[i](dev, pos + total,
							       len - total);
				if (done < 0)
					return -EFAULT;
				total += done;
			}
		}
2864
	}
L
Linus Torvalds 已提交
2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881

	/*
	 *	All done.  Write the updated control block back to the caller.
	 */
	ifc.ifc_len = total;

	/*
	 * 	Both BSD and Solaris return 0 here, so we do too.
	 */
	return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
}

#ifdef CONFIG_PROC_FS
/*
 *	This is invoked by the /proc filesystem handler to display a device
 *	in detail.
 */
2882
void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2883
	__acquires(dev_base_lock)
L
Linus Torvalds 已提交
2884
{
2885
	struct net *net = seq_file_net(seq);
2886
	loff_t off;
L
Linus Torvalds 已提交
2887 2888
	struct net_device *dev;

2889 2890 2891
	read_lock(&dev_base_lock);
	if (!*pos)
		return SEQ_START_TOKEN;
L
Linus Torvalds 已提交
2892

2893
	off = 1;
2894
	for_each_netdev(net, dev)
2895 2896
		if (off++ == *pos)
			return dev;
L
Linus Torvalds 已提交
2897

2898
	return NULL;
L
Linus Torvalds 已提交
2899 2900 2901 2902
}

void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
2903
	struct net *net = seq_file_net(seq);
L
Linus Torvalds 已提交
2904
	++*pos;
2905
	return v == SEQ_START_TOKEN ?
2906
		first_net_device(net) : next_net_device((struct net_device *)v);
L
Linus Torvalds 已提交
2907 2908 2909
}

void dev_seq_stop(struct seq_file *seq, void *v)
2910
	__releases(dev_base_lock)
L
Linus Torvalds 已提交
2911 2912 2913 2914 2915 2916
{
	read_unlock(&dev_base_lock);
}

static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
2917
	const struct net_device_stats *stats = dev_get_stats(dev);
L
Linus Torvalds 已提交
2918

2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935
	seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
		   "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
		   dev->name, stats->rx_bytes, stats->rx_packets,
		   stats->rx_errors,
		   stats->rx_dropped + stats->rx_missed_errors,
		   stats->rx_fifo_errors,
		   stats->rx_length_errors + stats->rx_over_errors +
		    stats->rx_crc_errors + stats->rx_frame_errors,
		   stats->rx_compressed, stats->multicast,
		   stats->tx_bytes, stats->tx_packets,
		   stats->tx_errors, stats->tx_dropped,
		   stats->tx_fifo_errors, stats->collisions,
		   stats->tx_carrier_errors +
		    stats->tx_aborted_errors +
		    stats->tx_window_errors +
		    stats->tx_heartbeat_errors,
		   stats->tx_compressed);
L
Linus Torvalds 已提交
2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958
}

/*
 *	Called from the PROCfs module. This now uses the new arbitrary sized
 *	/proc/net interface to create /proc/net/dev
 */
static int dev_seq_show(struct seq_file *seq, void *v)
{
	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "Inter-|   Receive                            "
			      "                    |  Transmit\n"
			      " face |bytes    packets errs drop fifo frame "
			      "compressed multicast|bytes    packets errs "
			      "drop fifo colls carrier compressed\n");
	else
		dev_seq_printf_stats(seq, v);
	return 0;
}

static struct netif_rx_stats *softnet_get_online(loff_t *pos)
{
	struct netif_rx_stats *rc = NULL;

2959
	while (*pos < nr_cpu_ids)
2960
		if (cpu_online(*pos)) {
L
Linus Torvalds 已提交
2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987
			rc = &per_cpu(netdev_rx_stat, *pos);
			break;
		} else
			++*pos;
	return rc;
}

static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
{
	return softnet_get_online(pos);
}

static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	++*pos;
	return softnet_get_online(pos);
}

static void softnet_seq_stop(struct seq_file *seq, void *v)
{
}

static int softnet_seq_show(struct seq_file *seq, void *v)
{
	struct netif_rx_stats *s = v;

	seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2988
		   s->total, s->dropped, s->time_squeeze, 0,
2989 2990
		   0, 0, 0, 0, /* was fastroute */
		   s->cpu_collision );
L
Linus Torvalds 已提交
2991 2992 2993
	return 0;
}

2994
static const struct seq_operations dev_seq_ops = {
L
Linus Torvalds 已提交
2995 2996 2997 2998 2999 3000 3001 3002
	.start = dev_seq_start,
	.next  = dev_seq_next,
	.stop  = dev_seq_stop,
	.show  = dev_seq_show,
};

static int dev_seq_open(struct inode *inode, struct file *file)
{
3003 3004
	return seq_open_net(inode, file, &dev_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
3005 3006
}

3007
static const struct file_operations dev_seq_fops = {
L
Linus Torvalds 已提交
3008 3009 3010 3011
	.owner	 = THIS_MODULE,
	.open    = dev_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
3012
	.release = seq_release_net,
L
Linus Torvalds 已提交
3013 3014
};

3015
static const struct seq_operations softnet_seq_ops = {
L
Linus Torvalds 已提交
3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026
	.start = softnet_seq_start,
	.next  = softnet_seq_next,
	.stop  = softnet_seq_stop,
	.show  = softnet_seq_show,
};

static int softnet_seq_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &softnet_seq_ops);
}

3027
static const struct file_operations softnet_seq_fops = {
L
Linus Torvalds 已提交
3028 3029 3030 3031 3032 3033 3034
	.owner	 = THIS_MODULE,
	.open    = softnet_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release,
};

3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046
static void *ptype_get_idx(loff_t pos)
{
	struct packet_type *pt = NULL;
	loff_t i = 0;
	int t;

	list_for_each_entry_rcu(pt, &ptype_all, list) {
		if (i == pos)
			return pt;
		++i;
	}

3047
	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3048 3049 3050 3051 3052 3053 3054 3055 3056 3057
		list_for_each_entry_rcu(pt, &ptype_base[t], list) {
			if (i == pos)
				return pt;
			++i;
		}
	}
	return NULL;
}

static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3058
	__acquires(RCU)
3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081
{
	rcu_read_lock();
	return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
}

static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct packet_type *pt;
	struct list_head *nxt;
	int hash;

	++*pos;
	if (v == SEQ_START_TOKEN)
		return ptype_get_idx(0);

	pt = v;
	nxt = pt->list.next;
	if (pt->type == htons(ETH_P_ALL)) {
		if (nxt != &ptype_all)
			goto found;
		hash = 0;
		nxt = ptype_base[0].next;
	} else
3082
		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3083 3084

	while (nxt == &ptype_base[hash]) {
3085
		if (++hash >= PTYPE_HASH_SIZE)
3086 3087 3088 3089 3090 3091 3092 3093
			return NULL;
		nxt = ptype_base[hash].next;
	}
found:
	return list_entry(nxt, struct packet_type, list);
}

static void ptype_seq_stop(struct seq_file *seq, void *v)
3094
	__releases(RCU)
3095 3096 3097 3098 3099 3100 3101 3102 3103 3104
{
	rcu_read_unlock();
}

static int ptype_seq_show(struct seq_file *seq, void *v)
{
	struct packet_type *pt = v;

	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "Type Device      Function\n");
3105
	else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3106 3107 3108 3109 3110
		if (pt->type == htons(ETH_P_ALL))
			seq_puts(seq, "ALL ");
		else
			seq_printf(seq, "%04x", ntohs(pt->type));

A
Alexey Dobriyan 已提交
3111 3112
		seq_printf(seq, " %-8s %pF\n",
			   pt->dev ? pt->dev->name : "", pt->func);
3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126
	}

	return 0;
}

static const struct seq_operations ptype_seq_ops = {
	.start = ptype_seq_start,
	.next  = ptype_seq_next,
	.stop  = ptype_seq_stop,
	.show  = ptype_seq_show,
};

static int ptype_seq_open(struct inode *inode, struct file *file)
{
3127 3128
	return seq_open_net(inode, file, &ptype_seq_ops,
			sizeof(struct seq_net_private));
3129 3130 3131 3132 3133 3134 3135
}

static const struct file_operations ptype_seq_fops = {
	.owner	 = THIS_MODULE,
	.open    = ptype_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
3136
	.release = seq_release_net,
3137 3138 3139
};


3140
static int __net_init dev_proc_net_init(struct net *net)
L
Linus Torvalds 已提交
3141 3142 3143
{
	int rc = -ENOMEM;

3144
	if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
L
Linus Torvalds 已提交
3145
		goto out;
3146
	if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
L
Linus Torvalds 已提交
3147
		goto out_dev;
3148
	if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3149
		goto out_softnet;
3150

3151
	if (wext_proc_init(net))
3152
		goto out_ptype;
L
Linus Torvalds 已提交
3153 3154 3155
	rc = 0;
out:
	return rc;
3156
out_ptype:
3157
	proc_net_remove(net, "ptype");
L
Linus Torvalds 已提交
3158
out_softnet:
3159
	proc_net_remove(net, "softnet_stat");
L
Linus Torvalds 已提交
3160
out_dev:
3161
	proc_net_remove(net, "dev");
L
Linus Torvalds 已提交
3162 3163
	goto out;
}
3164

3165
static void __net_exit dev_proc_net_exit(struct net *net)
3166 3167 3168 3169 3170 3171 3172 3173
{
	wext_proc_exit(net);

	proc_net_remove(net, "ptype");
	proc_net_remove(net, "softnet_stat");
	proc_net_remove(net, "dev");
}

3174
static struct pernet_operations __net_initdata dev_proc_ops = {
3175 3176 3177 3178 3179 3180 3181 3182
	.init = dev_proc_net_init,
	.exit = dev_proc_net_exit,
};

static int __init dev_proc_init(void)
{
	return register_pernet_subsys(&dev_proc_ops);
}
L
Linus Torvalds 已提交
3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211
#else
#define dev_proc_init() 0
#endif	/* CONFIG_PROC_FS */


/**
 *	netdev_set_master	-	set up master/slave pair
 *	@slave: slave device
 *	@master: new master device
 *
 *	Changes the master device of the slave. Pass %NULL to break the
 *	bonding. The caller must hold the RTNL semaphore. On a failure
 *	a negative errno code is returned. On success the reference counts
 *	are adjusted, %RTM_NEWLINK is sent to the routing socket and the
 *	function returns zero.
 */
int netdev_set_master(struct net_device *slave, struct net_device *master)
{
	struct net_device *old = slave->master;

	ASSERT_RTNL();

	if (master) {
		if (old)
			return -EBUSY;
		dev_hold(master);
	}

	slave->master = master;
3212

L
Linus Torvalds 已提交
3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226
	synchronize_net();

	if (old)
		dev_put(old);

	if (master)
		slave->flags |= IFF_SLAVE;
	else
		slave->flags &= ~IFF_SLAVE;

	rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
	return 0;
}

3227 3228
static void dev_change_rx_flags(struct net_device *dev, int flags)
{
3229 3230 3231 3232
	const struct net_device_ops *ops = dev->netdev_ops;

	if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
		ops->ndo_change_rx_flags(dev, flags);
3233 3234
}

3235
static int __dev_set_promiscuity(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
3236 3237
{
	unsigned short old_flags = dev->flags;
3238 3239
	uid_t uid;
	gid_t gid;
L
Linus Torvalds 已提交
3240

3241 3242
	ASSERT_RTNL();

3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259
	dev->flags |= IFF_PROMISC;
	dev->promiscuity += inc;
	if (dev->promiscuity == 0) {
		/*
		 * Avoid overflow.
		 * If inc causes overflow, untouch promisc and return error.
		 */
		if (inc < 0)
			dev->flags &= ~IFF_PROMISC;
		else {
			dev->promiscuity -= inc;
			printk(KERN_WARNING "%s: promiscuity touches roof, "
				"set promiscuity failed, promiscuity feature "
				"of device might be broken.\n", dev->name);
			return -EOVERFLOW;
		}
	}
3260
	if (dev->flags != old_flags) {
L
Linus Torvalds 已提交
3261 3262
		printk(KERN_INFO "device %s %s promiscuous mode\n",
		       dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
3263
							       "left");
3264 3265
		if (audit_enabled) {
			current_uid_gid(&uid, &gid);
3266 3267 3268 3269 3270 3271
			audit_log(current->audit_context, GFP_ATOMIC,
				AUDIT_ANOM_PROMISCUOUS,
				"dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
				dev->name, (dev->flags & IFF_PROMISC),
				(old_flags & IFF_PROMISC),
				audit_get_loginuid(current),
3272
				uid, gid,
3273
				audit_get_sessionid(current));
3274
		}
3275

3276
		dev_change_rx_flags(dev, IFF_PROMISC);
L
Linus Torvalds 已提交
3277
	}
3278
	return 0;
L
Linus Torvalds 已提交
3279 3280
}

3281 3282 3283 3284 3285 3286 3287 3288 3289
/**
 *	dev_set_promiscuity	- update promiscuity count on a device
 *	@dev: device
 *	@inc: modifier
 *
 *	Add or remove promiscuity from a device. While the count in the device
 *	remains above zero the interface remains promiscuous. Once it hits zero
 *	the device reverts back to normal filtering operation. A negative inc
 *	value is used to drop promiscuity on the device.
3290
 *	Return 0 if successful or a negative errno code on error.
3291
 */
3292
int dev_set_promiscuity(struct net_device *dev, int inc)
3293 3294
{
	unsigned short old_flags = dev->flags;
3295
	int err;
3296

3297
	err = __dev_set_promiscuity(dev, inc);
3298
	if (err < 0)
3299
		return err;
3300 3301
	if (dev->flags != old_flags)
		dev_set_rx_mode(dev);
3302
	return err;
3303 3304
}

L
Linus Torvalds 已提交
3305 3306 3307 3308 3309 3310 3311 3312 3313 3314
/**
 *	dev_set_allmulti	- update allmulti count on a device
 *	@dev: device
 *	@inc: modifier
 *
 *	Add or remove reception of all multicast frames to a device. While the
 *	count in the device remains above zero the interface remains listening
 *	to all interfaces. Once it hits zero the device reverts back to normal
 *	filtering operation. A negative @inc value is used to drop the counter
 *	when releasing a resource needing all multicasts.
3315
 *	Return 0 if successful or a negative errno code on error.
L
Linus Torvalds 已提交
3316 3317
 */

3318
int dev_set_allmulti(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
3319 3320 3321
{
	unsigned short old_flags = dev->flags;

3322 3323
	ASSERT_RTNL();

L
Linus Torvalds 已提交
3324
	dev->flags |= IFF_ALLMULTI;
3325 3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340
	dev->allmulti += inc;
	if (dev->allmulti == 0) {
		/*
		 * Avoid overflow.
		 * If inc causes overflow, untouch allmulti and return error.
		 */
		if (inc < 0)
			dev->flags &= ~IFF_ALLMULTI;
		else {
			dev->allmulti -= inc;
			printk(KERN_WARNING "%s: allmulti touches roof, "
				"set allmulti failed, allmulti feature of "
				"device might be broken.\n", dev->name);
			return -EOVERFLOW;
		}
	}
3341
	if (dev->flags ^ old_flags) {
3342
		dev_change_rx_flags(dev, IFF_ALLMULTI);
3343
		dev_set_rx_mode(dev);
3344
	}
3345
	return 0;
3346 3347 3348 3349 3350
}

/*
 *	Upload unicast and multicast address lists to device and
 *	configure RX filtering. When the device doesn't support unicast
J
Joe Perches 已提交
3351
 *	filtering it is put in promiscuous mode while unicast addresses
3352 3353 3354 3355
 *	are present.
 */
void __dev_set_rx_mode(struct net_device *dev)
{
3356 3357
	const struct net_device_ops *ops = dev->netdev_ops;

3358 3359 3360 3361 3362
	/* dev_open will call this function so the list will stay sane. */
	if (!(dev->flags&IFF_UP))
		return;

	if (!netif_device_present(dev))
3363
		return;
3364

3365 3366
	if (ops->ndo_set_rx_mode)
		ops->ndo_set_rx_mode(dev);
3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378
	else {
		/* Unicast addresses changes may only happen under the rtnl,
		 * therefore calling __dev_set_promiscuity here is safe.
		 */
		if (dev->uc_count > 0 && !dev->uc_promisc) {
			__dev_set_promiscuity(dev, 1);
			dev->uc_promisc = 1;
		} else if (dev->uc_count == 0 && dev->uc_promisc) {
			__dev_set_promiscuity(dev, -1);
			dev->uc_promisc = 0;
		}

3379 3380
		if (ops->ndo_set_multicast_list)
			ops->ndo_set_multicast_list(dev);
3381 3382 3383 3384 3385
	}
}

void dev_set_rx_mode(struct net_device *dev)
{
3386
	netif_addr_lock_bh(dev);
3387
	__dev_set_rx_mode(dev);
3388
	netif_addr_unlock_bh(dev);
L
Linus Torvalds 已提交
3389 3390
}

3391 3392
int __dev_addr_delete(struct dev_addr_list **list, int *count,
		      void *addr, int alen, int glbl)
3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409
{
	struct dev_addr_list *da;

	for (; (da = *list) != NULL; list = &da->next) {
		if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
		    alen == da->da_addrlen) {
			if (glbl) {
				int old_glbl = da->da_gusers;
				da->da_gusers = 0;
				if (old_glbl == 0)
					break;
			}
			if (--da->da_users)
				return 0;

			*list = da->next;
			kfree(da);
3410
			(*count)--;
3411 3412 3413 3414 3415 3416
			return 0;
		}
	}
	return -ENOENT;
}

3417 3418
int __dev_addr_add(struct dev_addr_list **list, int *count,
		   void *addr, int alen, int glbl)
3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435
{
	struct dev_addr_list *da;

	for (da = *list; da != NULL; da = da->next) {
		if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
		    da->da_addrlen == alen) {
			if (glbl) {
				int old_glbl = da->da_gusers;
				da->da_gusers = 1;
				if (old_glbl)
					return 0;
			}
			da->da_users++;
			return 0;
		}
	}

3436
	da = kzalloc(sizeof(*da), GFP_ATOMIC);
3437 3438 3439 3440 3441 3442 3443 3444
	if (da == NULL)
		return -ENOMEM;
	memcpy(da->da_addr, addr, alen);
	da->da_addrlen = alen;
	da->da_users = 1;
	da->da_gusers = glbl ? 1 : 0;
	da->next = *list;
	*list = da;
3445
	(*count)++;
3446 3447 3448
	return 0;
}

3449 3450 3451
/**
 *	dev_unicast_delete	- Release secondary unicast address.
 *	@dev: device
R
Randy Dunlap 已提交
3452 3453
 *	@addr: address to delete
 *	@alen: length of @addr
3454 3455
 *
 *	Release reference to a secondary unicast address and remove it
R
Randy Dunlap 已提交
3456
 *	from the device if the reference count drops to zero.
3457 3458 3459 3460 3461 3462 3463 3464 3465
 *
 * 	The caller must hold the rtnl_mutex.
 */
int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
{
	int err;

	ASSERT_RTNL();

3466
	netif_addr_lock_bh(dev);
3467 3468
	err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
	if (!err)
3469
		__dev_set_rx_mode(dev);
3470
	netif_addr_unlock_bh(dev);
3471 3472 3473 3474 3475 3476 3477
	return err;
}
EXPORT_SYMBOL(dev_unicast_delete);

/**
 *	dev_unicast_add		- add a secondary unicast address
 *	@dev: device
3478
 *	@addr: address to add
R
Randy Dunlap 已提交
3479
 *	@alen: length of @addr
3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491
 *
 *	Add a secondary unicast address to the device or increase
 *	the reference count if it already exists.
 *
 *	The caller must hold the rtnl_mutex.
 */
int dev_unicast_add(struct net_device *dev, void *addr, int alen)
{
	int err;

	ASSERT_RTNL();

3492
	netif_addr_lock_bh(dev);
3493 3494
	err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
	if (!err)
3495
		__dev_set_rx_mode(dev);
3496
	netif_addr_unlock_bh(dev);
3497 3498 3499 3500
	return err;
}
EXPORT_SYMBOL(dev_unicast_add);

3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562
int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
		    struct dev_addr_list **from, int *from_count)
{
	struct dev_addr_list *da, *next;
	int err = 0;

	da = *from;
	while (da != NULL) {
		next = da->next;
		if (!da->da_synced) {
			err = __dev_addr_add(to, to_count,
					     da->da_addr, da->da_addrlen, 0);
			if (err < 0)
				break;
			da->da_synced = 1;
			da->da_users++;
		} else if (da->da_users == 1) {
			__dev_addr_delete(to, to_count,
					  da->da_addr, da->da_addrlen, 0);
			__dev_addr_delete(from, from_count,
					  da->da_addr, da->da_addrlen, 0);
		}
		da = next;
	}
	return err;
}

void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
		       struct dev_addr_list **from, int *from_count)
{
	struct dev_addr_list *da, *next;

	da = *from;
	while (da != NULL) {
		next = da->next;
		if (da->da_synced) {
			__dev_addr_delete(to, to_count,
					  da->da_addr, da->da_addrlen, 0);
			da->da_synced = 0;
			__dev_addr_delete(from, from_count,
					  da->da_addr, da->da_addrlen, 0);
		}
		da = next;
	}
}

/**
 *	dev_unicast_sync - Synchronize device's unicast list to another device
 *	@to: destination device
 *	@from: source device
 *
 *	Add newly added addresses to the destination device and release
 *	addresses that have no users left. The source device must be
 *	locked by netif_tx_lock_bh.
 *
 *	This function is intended to be called from the dev->set_rx_mode
 *	function of layered software devices.
 */
int dev_unicast_sync(struct net_device *to, struct net_device *from)
{
	int err = 0;

3563
	netif_addr_lock_bh(to);
3564 3565 3566 3567
	err = __dev_addr_sync(&to->uc_list, &to->uc_count,
			      &from->uc_list, &from->uc_count);
	if (!err)
		__dev_set_rx_mode(to);
3568
	netif_addr_unlock_bh(to);
3569 3570 3571 3572 3573
	return err;
}
EXPORT_SYMBOL(dev_unicast_sync);

/**
3574
 *	dev_unicast_unsync - Remove synchronized addresses from the destination device
3575 3576 3577 3578 3579 3580 3581 3582 3583
 *	@to: destination device
 *	@from: source device
 *
 *	Remove all addresses that were added to the destination device by
 *	dev_unicast_sync(). This function is intended to be called from the
 *	dev->stop function of layered software devices.
 */
void dev_unicast_unsync(struct net_device *to, struct net_device *from)
{
3584
	netif_addr_lock_bh(from);
3585
	netif_addr_lock(to);
3586 3587 3588 3589 3590

	__dev_addr_unsync(&to->uc_list, &to->uc_count,
			  &from->uc_list, &from->uc_count);
	__dev_set_rx_mode(to);

3591
	netif_addr_unlock(to);
3592
	netif_addr_unlock_bh(from);
3593 3594 3595
}
EXPORT_SYMBOL(dev_unicast_unsync);

3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609
static void __dev_addr_discard(struct dev_addr_list **list)
{
	struct dev_addr_list *tmp;

	while (*list != NULL) {
		tmp = *list;
		*list = tmp->next;
		if (tmp->da_users > tmp->da_gusers)
			printk("__dev_addr_discard: address leakage! "
			       "da_users=%d\n", tmp->da_users);
		kfree(tmp);
	}
}

3610
static void dev_addr_discard(struct net_device *dev)
3611
{
3612
	netif_addr_lock_bh(dev);
3613

3614 3615 3616
	__dev_addr_discard(&dev->uc_list);
	dev->uc_count = 0;

3617 3618
	__dev_addr_discard(&dev->mc_list);
	dev->mc_count = 0;
3619

3620
	netif_addr_unlock_bh(dev);
3621 3622
}

3623 3624 3625 3626 3627 3628
/**
 *	dev_get_flags - get flags reported to userspace
 *	@dev: device
 *
 *	Get the combination of flag bits exported through APIs to userspace.
 */
L
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3629 3630 3631 3632 3633 3634
unsigned dev_get_flags(const struct net_device *dev)
{
	unsigned flags;

	flags = (dev->flags & ~(IFF_PROMISC |
				IFF_ALLMULTI |
S
Stefan Rompf 已提交
3635 3636 3637
				IFF_RUNNING |
				IFF_LOWER_UP |
				IFF_DORMANT)) |
L
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3638 3639 3640
		(dev->gflags & (IFF_PROMISC |
				IFF_ALLMULTI));

S
Stefan Rompf 已提交
3641 3642 3643 3644 3645 3646 3647 3648
	if (netif_running(dev)) {
		if (netif_oper_up(dev))
			flags |= IFF_RUNNING;
		if (netif_carrier_ok(dev))
			flags |= IFF_LOWER_UP;
		if (netif_dormant(dev))
			flags |= IFF_DORMANT;
	}
L
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3649 3650 3651 3652

	return flags;
}

3653 3654 3655 3656 3657 3658 3659 3660
/**
 *	dev_change_flags - change device settings
 *	@dev: device
 *	@flags: device state flags
 *
 *	Change settings on device based state flags. The flags are
 *	in the userspace exported format.
 */
L
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int dev_change_flags(struct net_device *dev, unsigned flags)
{
3663
	int ret, changes;
L
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3664 3665
	int old_flags = dev->flags;

3666 3667
	ASSERT_RTNL();

L
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3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681
	/*
	 *	Set the flags on our device.
	 */

	dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
			       IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
			       IFF_AUTOMEDIA)) |
		     (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
				    IFF_ALLMULTI));

	/*
	 *	Load in the correct multicast list now the flags have changed.
	 */

3682 3683
	if ((old_flags ^ flags) & IFF_MULTICAST)
		dev_change_rx_flags(dev, IFF_MULTICAST);
3684

3685
	dev_set_rx_mode(dev);
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3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697

	/*
	 *	Have we downed the interface. We handle IFF_UP ourselves
	 *	according to user attempts to set it, rather than blindly
	 *	setting it.
	 */

	ret = 0;
	if ((old_flags ^ flags) & IFF_UP) {	/* Bit is different  ? */
		ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);

		if (!ret)
3698
			dev_set_rx_mode(dev);
L
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3699 3700 3701 3702 3703
	}

	if (dev->flags & IFF_UP &&
	    ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
					  IFF_VOLATILE)))
3704
		call_netdevice_notifiers(NETDEV_CHANGE, dev);
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	if ((flags ^ dev->gflags) & IFF_PROMISC) {
		int inc = (flags & IFF_PROMISC) ? +1 : -1;
		dev->gflags ^= IFF_PROMISC;
		dev_set_promiscuity(dev, inc);
	}

	/* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
	   is important. Some (broken) drivers set IFF_PROMISC, when
	   IFF_ALLMULTI is requested not asking us and not reporting.
	 */
	if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
		int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
		dev->gflags ^= IFF_ALLMULTI;
		dev_set_allmulti(dev, inc);
	}

3722 3723 3724 3725
	/* Exclude state transition flags, already notified */
	changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
	if (changes)
		rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
L
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3726 3727 3728 3729

	return ret;
}

3730 3731 3732 3733 3734 3735 3736
/**
 *	dev_set_mtu - Change maximum transfer unit
 *	@dev: device
 *	@new_mtu: new transfer unit
 *
 *	Change the maximum transfer size of the network device.
 */
L
Linus Torvalds 已提交
3737 3738
int dev_set_mtu(struct net_device *dev, int new_mtu)
{
3739
	const struct net_device_ops *ops = dev->netdev_ops;
L
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3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752
	int err;

	if (new_mtu == dev->mtu)
		return 0;

	/*	MTU must be positive.	 */
	if (new_mtu < 0)
		return -EINVAL;

	if (!netif_device_present(dev))
		return -ENODEV;

	err = 0;
3753 3754
	if (ops->ndo_change_mtu)
		err = ops->ndo_change_mtu(dev, new_mtu);
L
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3755 3756
	else
		dev->mtu = new_mtu;
3757

L
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3758
	if (!err && dev->flags & IFF_UP)
3759
		call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
L
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3760 3761 3762
	return err;
}

3763 3764 3765 3766 3767 3768 3769
/**
 *	dev_set_mac_address - Change Media Access Control Address
 *	@dev: device
 *	@sa: new address
 *
 *	Change the hardware (MAC) address of the device
 */
L
Linus Torvalds 已提交
3770 3771
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
{
3772
	const struct net_device_ops *ops = dev->netdev_ops;
L
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3773 3774
	int err;

3775
	if (!ops->ndo_set_mac_address)
L
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3776 3777 3778 3779 3780
		return -EOPNOTSUPP;
	if (sa->sa_family != dev->type)
		return -EINVAL;
	if (!netif_device_present(dev))
		return -ENODEV;
3781
	err = ops->ndo_set_mac_address(dev, sa);
L
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3782
	if (!err)
3783
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
L
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3784 3785 3786 3787
	return err;
}

/*
3788
 *	Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
L
Linus Torvalds 已提交
3789
 */
3790
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
L
Linus Torvalds 已提交
3791 3792
{
	int err;
3793
	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
L
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3794 3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820

	if (!dev)
		return -ENODEV;

	switch (cmd) {
		case SIOCGIFFLAGS:	/* Get interface flags */
			ifr->ifr_flags = dev_get_flags(dev);
			return 0;

		case SIOCGIFMETRIC:	/* Get the metric on the interface
					   (currently unused) */
			ifr->ifr_metric = 0;
			return 0;

		case SIOCGIFMTU:	/* Get the MTU of a device */
			ifr->ifr_mtu = dev->mtu;
			return 0;

		case SIOCGIFHWADDR:
			if (!dev->addr_len)
				memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
			else
				memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
				       min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
			ifr->ifr_hwaddr.sa_family = dev->type;
			return 0;

3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860
		case SIOCGIFSLAVE:
			err = -EINVAL;
			break;

		case SIOCGIFMAP:
			ifr->ifr_map.mem_start = dev->mem_start;
			ifr->ifr_map.mem_end   = dev->mem_end;
			ifr->ifr_map.base_addr = dev->base_addr;
			ifr->ifr_map.irq       = dev->irq;
			ifr->ifr_map.dma       = dev->dma;
			ifr->ifr_map.port      = dev->if_port;
			return 0;

		case SIOCGIFINDEX:
			ifr->ifr_ifindex = dev->ifindex;
			return 0;

		case SIOCGIFTXQLEN:
			ifr->ifr_qlen = dev->tx_queue_len;
			return 0;

		default:
			/* dev_ioctl() should ensure this case
			 * is never reached
			 */
			WARN_ON(1);
			err = -EINVAL;
			break;

	}
	return err;
}

/*
 *	Perform the SIOCxIFxxx calls, inside rtnl_lock()
 */
static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
{
	int err;
	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
J
Jarek Poplawski 已提交
3861
	const struct net_device_ops *ops;
3862 3863 3864 3865

	if (!dev)
		return -ENODEV;

J
Jarek Poplawski 已提交
3866 3867
	ops = dev->netdev_ops;

3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878
	switch (cmd) {
		case SIOCSIFFLAGS:	/* Set interface flags */
			return dev_change_flags(dev, ifr->ifr_flags);

		case SIOCSIFMETRIC:	/* Set the metric on the interface
					   (currently unused) */
			return -EOPNOTSUPP;

		case SIOCSIFMTU:	/* Set the MTU of a device */
			return dev_set_mtu(dev, ifr->ifr_mtu);

L
Linus Torvalds 已提交
3879 3880 3881 3882 3883 3884 3885 3886
		case SIOCSIFHWADDR:
			return dev_set_mac_address(dev, &ifr->ifr_hwaddr);

		case SIOCSIFHWBROADCAST:
			if (ifr->ifr_hwaddr.sa_family != dev->type)
				return -EINVAL;
			memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
			       min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3887
			call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
L
Linus Torvalds 已提交
3888 3889 3890
			return 0;

		case SIOCSIFMAP:
3891
			if (ops->ndo_set_config) {
L
Linus Torvalds 已提交
3892 3893
				if (!netif_device_present(dev))
					return -ENODEV;
3894
				return ops->ndo_set_config(dev, &ifr->ifr_map);
L
Linus Torvalds 已提交
3895 3896 3897 3898
			}
			return -EOPNOTSUPP;

		case SIOCADDMULTI:
3899
			if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
L
Linus Torvalds 已提交
3900 3901 3902 3903 3904 3905 3906 3907
			    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
				return -EINVAL;
			if (!netif_device_present(dev))
				return -ENODEV;
			return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
					  dev->addr_len, 1);

		case SIOCDELMULTI:
3908
			if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
L
Linus Torvalds 已提交
3909 3910 3911 3912 3913 3914 3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945
			    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
				return -EINVAL;
			if (!netif_device_present(dev))
				return -ENODEV;
			return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
					     dev->addr_len, 1);

		case SIOCSIFTXQLEN:
			if (ifr->ifr_qlen < 0)
				return -EINVAL;
			dev->tx_queue_len = ifr->ifr_qlen;
			return 0;

		case SIOCSIFNAME:
			ifr->ifr_newname[IFNAMSIZ-1] = '\0';
			return dev_change_name(dev, ifr->ifr_newname);

		/*
		 *	Unknown or private ioctl
		 */

		default:
			if ((cmd >= SIOCDEVPRIVATE &&
			    cmd <= SIOCDEVPRIVATE + 15) ||
			    cmd == SIOCBONDENSLAVE ||
			    cmd == SIOCBONDRELEASE ||
			    cmd == SIOCBONDSETHWADDR ||
			    cmd == SIOCBONDSLAVEINFOQUERY ||
			    cmd == SIOCBONDINFOQUERY ||
			    cmd == SIOCBONDCHANGEACTIVE ||
			    cmd == SIOCGMIIPHY ||
			    cmd == SIOCGMIIREG ||
			    cmd == SIOCSMIIREG ||
			    cmd == SIOCBRADDIF ||
			    cmd == SIOCBRDELIF ||
			    cmd == SIOCWANDEV) {
				err = -EOPNOTSUPP;
3946
				if (ops->ndo_do_ioctl) {
L
Linus Torvalds 已提交
3947
					if (netif_device_present(dev))
3948
						err = ops->ndo_do_ioctl(dev, ifr, cmd);
L
Linus Torvalds 已提交
3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965
					else
						err = -ENODEV;
				}
			} else
				err = -EINVAL;

	}
	return err;
}

/*
 *	This function handles all "interface"-type I/O control requests. The actual
 *	'doing' part of this is dev_ifsioc above.
 */

/**
 *	dev_ioctl	-	network device ioctl
3966
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
3967 3968 3969 3970 3971 3972 3973 3974 3975
 *	@cmd: command to issue
 *	@arg: pointer to a struct ifreq in user space
 *
 *	Issue ioctl functions to devices. This is normally called by the
 *	user space syscall interfaces but can sometimes be useful for
 *	other purposes. The return value is the return from the syscall if
 *	positive or a negative errno code on error.
 */

3976
int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
L
Linus Torvalds 已提交
3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987
{
	struct ifreq ifr;
	int ret;
	char *colon;

	/* One special case: SIOCGIFCONF takes ifconf argument
	   and requires shared lock, because it sleeps writing
	   to user space.
	 */

	if (cmd == SIOCGIFCONF) {
3988
		rtnl_lock();
3989
		ret = dev_ifconf(net, (char __user *) arg);
3990
		rtnl_unlock();
L
Linus Torvalds 已提交
3991 3992 3993
		return ret;
	}
	if (cmd == SIOCGIFNAME)
3994
		return dev_ifname(net, (struct ifreq __user *)arg);
L
Linus Torvalds 已提交
3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023

	if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
		return -EFAULT;

	ifr.ifr_name[IFNAMSIZ-1] = 0;

	colon = strchr(ifr.ifr_name, ':');
	if (colon)
		*colon = 0;

	/*
	 *	See which interface the caller is talking about.
	 */

	switch (cmd) {
		/*
		 *	These ioctl calls:
		 *	- can be done by all.
		 *	- atomic and do not require locking.
		 *	- return a value
		 */
		case SIOCGIFFLAGS:
		case SIOCGIFMETRIC:
		case SIOCGIFMTU:
		case SIOCGIFHWADDR:
		case SIOCGIFSLAVE:
		case SIOCGIFMAP:
		case SIOCGIFINDEX:
		case SIOCGIFTXQLEN:
4024
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
4025
			read_lock(&dev_base_lock);
4026
			ret = dev_ifsioc_locked(net, &ifr, cmd);
L
Linus Torvalds 已提交
4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037
			read_unlock(&dev_base_lock);
			if (!ret) {
				if (colon)
					*colon = ':';
				if (copy_to_user(arg, &ifr,
						 sizeof(struct ifreq)))
					ret = -EFAULT;
			}
			return ret;

		case SIOCETHTOOL:
4038
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
4039
			rtnl_lock();
4040
			ret = dev_ethtool(net, &ifr);
L
Linus Torvalds 已提交
4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061
			rtnl_unlock();
			if (!ret) {
				if (colon)
					*colon = ':';
				if (copy_to_user(arg, &ifr,
						 sizeof(struct ifreq)))
					ret = -EFAULT;
			}
			return ret;

		/*
		 *	These ioctl calls:
		 *	- require superuser power.
		 *	- require strict serialization.
		 *	- return a value
		 */
		case SIOCGMIIPHY:
		case SIOCGMIIREG:
		case SIOCSIFNAME:
			if (!capable(CAP_NET_ADMIN))
				return -EPERM;
4062
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
4063
			rtnl_lock();
4064
			ret = dev_ifsioc(net, &ifr, cmd);
L
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4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099
			rtnl_unlock();
			if (!ret) {
				if (colon)
					*colon = ':';
				if (copy_to_user(arg, &ifr,
						 sizeof(struct ifreq)))
					ret = -EFAULT;
			}
			return ret;

		/*
		 *	These ioctl calls:
		 *	- require superuser power.
		 *	- require strict serialization.
		 *	- do not return a value
		 */
		case SIOCSIFFLAGS:
		case SIOCSIFMETRIC:
		case SIOCSIFMTU:
		case SIOCSIFMAP:
		case SIOCSIFHWADDR:
		case SIOCSIFSLAVE:
		case SIOCADDMULTI:
		case SIOCDELMULTI:
		case SIOCSIFHWBROADCAST:
		case SIOCSIFTXQLEN:
		case SIOCSMIIREG:
		case SIOCBONDENSLAVE:
		case SIOCBONDRELEASE:
		case SIOCBONDSETHWADDR:
		case SIOCBONDCHANGEACTIVE:
		case SIOCBRADDIF:
		case SIOCBRDELIF:
			if (!capable(CAP_NET_ADMIN))
				return -EPERM;
4100 4101 4102
			/* fall through */
		case SIOCBONDSLAVEINFOQUERY:
		case SIOCBONDINFOQUERY:
4103
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
4104
			rtnl_lock();
4105
			ret = dev_ifsioc(net, &ifr, cmd);
L
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4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124
			rtnl_unlock();
			return ret;

		case SIOCGIFMEM:
			/* Get the per device memory space. We can add this but
			 * currently do not support it */
		case SIOCSIFMEM:
			/* Set the per device memory buffer space.
			 * Not applicable in our case */
		case SIOCSIFLINK:
			return -EINVAL;

		/*
		 *	Unknown or private ioctl.
		 */
		default:
			if (cmd == SIOCWANDEV ||
			    (cmd >= SIOCDEVPRIVATE &&
			     cmd <= SIOCDEVPRIVATE + 15)) {
4125
				dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
4126
				rtnl_lock();
4127
				ret = dev_ifsioc(net, &ifr, cmd);
L
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4128 4129 4130 4131 4132 4133 4134
				rtnl_unlock();
				if (!ret && copy_to_user(arg, &ifr,
							 sizeof(struct ifreq)))
					ret = -EFAULT;
				return ret;
			}
			/* Take care of Wireless Extensions */
4135
			if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4136
				return wext_handle_ioctl(net, &ifr, cmd, arg);
L
Linus Torvalds 已提交
4137 4138 4139 4140 4141 4142 4143
			return -EINVAL;
	}
}


/**
 *	dev_new_index	-	allocate an ifindex
4144
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
4145 4146 4147 4148 4149
 *
 *	Returns a suitable unique value for a new device interface
 *	number.  The caller must hold the rtnl semaphore or the
 *	dev_base_lock to be sure it remains unique.
 */
4150
static int dev_new_index(struct net *net)
L
Linus Torvalds 已提交
4151 4152 4153 4154 4155
{
	static int ifindex;
	for (;;) {
		if (++ifindex <= 0)
			ifindex = 1;
4156
		if (!__dev_get_by_index(net, ifindex))
L
Linus Torvalds 已提交
4157 4158 4159 4160 4161
			return ifindex;
	}
}

/* Delayed registration/unregisteration */
4162
static LIST_HEAD(net_todo_list);
L
Linus Torvalds 已提交
4163

4164
static void net_set_todo(struct net_device *dev)
L
Linus Torvalds 已提交
4165 4166 4167 4168
{
	list_add_tail(&dev->todo_list, &net_todo_list);
}

4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206 4207 4208
static void rollback_registered(struct net_device *dev)
{
	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

	/* Some devices call without registering for initialization unwind. */
	if (dev->reg_state == NETREG_UNINITIALIZED) {
		printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
				  "was registered\n", dev->name, dev);

		WARN_ON(1);
		return;
	}

	BUG_ON(dev->reg_state != NETREG_REGISTERED);

	/* If device is running, close it first. */
	dev_close(dev);

	/* And unlink it from device chain. */
	unlist_netdevice(dev);

	dev->reg_state = NETREG_UNREGISTERING;

	synchronize_net();

	/* Shutdown queueing discipline. */
	dev_shutdown(dev);


	/* Notify protocols, that we are about to destroy
	   this device. They should clean all the things.
	*/
	call_netdevice_notifiers(NETDEV_UNREGISTER, dev);

	/*
	 *	Flush the unicast and multicast chains
	 */
	dev_addr_discard(dev);

4209 4210
	if (dev->netdev_ops->ndo_uninit)
		dev->netdev_ops->ndo_uninit(dev);
4211 4212

	/* Notifier chain MUST detach us from master device. */
4213
	WARN_ON(dev->master);
4214 4215 4216 4217 4218 4219 4220 4221 4222

	/* Remove entries from kobject tree */
	netdev_unregister_kobject(dev);

	synchronize_net();

	dev_put(dev);
}

4223 4224 4225
static void __netdev_init_queue_locks_one(struct net_device *dev,
					  struct netdev_queue *dev_queue,
					  void *_unused)
4226 4227
{
	spin_lock_init(&dev_queue->_xmit_lock);
4228
	netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4229 4230 4231 4232 4233
	dev_queue->xmit_lock_owner = -1;
}

static void netdev_init_queue_locks(struct net_device *dev)
{
4234 4235
	netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
	__netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4236 4237
}

4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277
unsigned long netdev_fix_features(unsigned long features, const char *name)
{
	/* Fix illegal SG+CSUM combinations. */
	if ((features & NETIF_F_SG) &&
	    !(features & NETIF_F_ALL_CSUM)) {
		if (name)
			printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
			       "checksum feature.\n", name);
		features &= ~NETIF_F_SG;
	}

	/* TSO requires that SG is present as well. */
	if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
		if (name)
			printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
			       "SG feature.\n", name);
		features &= ~NETIF_F_TSO;
	}

	if (features & NETIF_F_UFO) {
		if (!(features & NETIF_F_GEN_CSUM)) {
			if (name)
				printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
				       "since no NETIF_F_HW_CSUM feature.\n",
				       name);
			features &= ~NETIF_F_UFO;
		}

		if (!(features & NETIF_F_SG)) {
			if (name)
				printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
				       "since no NETIF_F_SG feature.\n", name);
			features &= ~NETIF_F_UFO;
		}
	}

	return features;
}
EXPORT_SYMBOL(netdev_fix_features);

L
Linus Torvalds 已提交
4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299
/**
 *	register_netdevice	- register a network device
 *	@dev: device to register
 *
 *	Take a completed network device structure and add it to the kernel
 *	interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
 *	chain. 0 is returned on success. A negative errno code is returned
 *	on a failure to set up the device, or if the name is a duplicate.
 *
 *	Callers must hold the rtnl semaphore. You may want
 *	register_netdev() instead of this.
 *
 *	BUGS:
 *	The locking appears insufficient to guarantee two parallel registers
 *	will not get the same name.
 */

int register_netdevice(struct net_device *dev)
{
	struct hlist_head *head;
	struct hlist_node *p;
	int ret;
4300
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
4301 4302 4303 4304

	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

4305 4306
	might_sleep();

L
Linus Torvalds 已提交
4307 4308
	/* When net_device's are persistent, this will be fatal. */
	BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4309
	BUG_ON(!net);
L
Linus Torvalds 已提交
4310

4311
	spin_lock_init(&dev->addr_list_lock);
4312
	netdev_set_addr_lockdep_class(dev);
4313
	netdev_init_queue_locks(dev);
L
Linus Torvalds 已提交
4314 4315 4316

	dev->iflink = -1;

4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353
#ifdef CONFIG_COMPAT_NET_DEV_OPS
	/* Netdevice_ops API compatiability support.
	 * This is temporary until all network devices are converted.
	 */
	if (dev->netdev_ops) {
		const struct net_device_ops *ops = dev->netdev_ops;

		dev->init = ops->ndo_init;
		dev->uninit = ops->ndo_uninit;
		dev->open = ops->ndo_open;
		dev->change_rx_flags = ops->ndo_change_rx_flags;
		dev->set_rx_mode = ops->ndo_set_rx_mode;
		dev->set_multicast_list = ops->ndo_set_multicast_list;
		dev->set_mac_address = ops->ndo_set_mac_address;
		dev->validate_addr = ops->ndo_validate_addr;
		dev->do_ioctl = ops->ndo_do_ioctl;
		dev->set_config = ops->ndo_set_config;
		dev->change_mtu = ops->ndo_change_mtu;
		dev->tx_timeout = ops->ndo_tx_timeout;
		dev->get_stats = ops->ndo_get_stats;
		dev->vlan_rx_register = ops->ndo_vlan_rx_register;
		dev->vlan_rx_add_vid = ops->ndo_vlan_rx_add_vid;
		dev->vlan_rx_kill_vid = ops->ndo_vlan_rx_kill_vid;
#ifdef CONFIG_NET_POLL_CONTROLLER
		dev->poll_controller = ops->ndo_poll_controller;
#endif
	} else {
		char drivername[64];
		pr_info("%s (%s): not using net_device_ops yet\n",
			dev->name, netdev_drivername(dev, drivername, 64));

		/* This works only because net_device_ops and the
		   compatiablity structure are the same. */
		dev->netdev_ops = (void *) &(dev->init);
	}
#endif

L
Linus Torvalds 已提交
4354
	/* Init, if this function is available */
4355 4356
	if (dev->netdev_ops->ndo_init) {
		ret = dev->netdev_ops->ndo_init(dev);
L
Linus Torvalds 已提交
4357 4358 4359
		if (ret) {
			if (ret > 0)
				ret = -EIO;
4360
			goto out;
L
Linus Torvalds 已提交
4361 4362
		}
	}
4363

L
Linus Torvalds 已提交
4364 4365
	if (!dev_valid_name(dev->name)) {
		ret = -EINVAL;
4366
		goto err_uninit;
L
Linus Torvalds 已提交
4367 4368
	}

4369
	dev->ifindex = dev_new_index(net);
L
Linus Torvalds 已提交
4370 4371 4372 4373
	if (dev->iflink == -1)
		dev->iflink = dev->ifindex;

	/* Check for existence of name */
4374
	head = dev_name_hash(net, dev->name);
L
Linus Torvalds 已提交
4375 4376 4377 4378 4379
	hlist_for_each(p, head) {
		struct net_device *d
			= hlist_entry(p, struct net_device, name_hlist);
		if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
			ret = -EEXIST;
4380
			goto err_uninit;
L
Linus Torvalds 已提交
4381
		}
4382
	}
L
Linus Torvalds 已提交
4383

4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398
	/* Fix illegal checksum combinations */
	if ((dev->features & NETIF_F_HW_CSUM) &&
	    (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
		printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
		       dev->name);
		dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
	}

	if ((dev->features & NETIF_F_NO_CSUM) &&
	    (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
		printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
		       dev->name);
		dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
	}

4399
	dev->features = netdev_fix_features(dev->features, dev->name);
L
Linus Torvalds 已提交
4400

4401 4402 4403 4404
	/* Enable software GSO if SG is supported. */
	if (dev->features & NETIF_F_SG)
		dev->features |= NETIF_F_GSO;

4405
	netdev_initialize_kobject(dev);
4406
	ret = netdev_register_kobject(dev);
4407
	if (ret)
4408
		goto err_uninit;
4409 4410
	dev->reg_state = NETREG_REGISTERED;

L
Linus Torvalds 已提交
4411 4412 4413 4414 4415 4416 4417 4418 4419
	/*
	 *	Default initial state at registry is that the
	 *	device is present.
	 */

	set_bit(__LINK_STATE_PRESENT, &dev->state);

	dev_init_scheduler(dev);
	dev_hold(dev);
4420
	list_netdevice(dev);
L
Linus Torvalds 已提交
4421 4422

	/* Notify protocols, that a new device appeared. */
4423
	ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4424
	ret = notifier_to_errno(ret);
4425 4426 4427 4428
	if (ret) {
		rollback_registered(dev);
		dev->reg_state = NETREG_UNREGISTERED;
	}
L
Linus Torvalds 已提交
4429 4430 4431

out:
	return ret;
4432 4433

err_uninit:
4434 4435
	if (dev->netdev_ops->ndo_uninit)
		dev->netdev_ops->ndo_uninit(dev);
4436
	goto out;
L
Linus Torvalds 已提交
4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447
}

/**
 *	register_netdev	- register a network device
 *	@dev: device to register
 *
 *	Take a completed network device structure and add it to the kernel
 *	interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
 *	chain. 0 is returned on success. A negative errno code is returned
 *	on a failure to set up the device, or if the name is a duplicate.
 *
4448
 *	This is a wrapper around register_netdevice that takes the rtnl semaphore
L
Linus Torvalds 已提交
4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466
 *	and expands the device name if you passed a format string to
 *	alloc_netdev.
 */
int register_netdev(struct net_device *dev)
{
	int err;

	rtnl_lock();

	/*
	 * If the name is a format string the caller wants us to do a
	 * name allocation.
	 */
	if (strchr(dev->name, '%')) {
		err = dev_alloc_name(dev, dev->name);
		if (err < 0)
			goto out;
	}
4467

L
Linus Torvalds 已提交
4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483
	err = register_netdevice(dev);
out:
	rtnl_unlock();
	return err;
}
EXPORT_SYMBOL(register_netdev);

/*
 * netdev_wait_allrefs - wait until all references are gone.
 *
 * This is called when unregistering network devices.
 *
 * Any protocol or device that holds a reference should register
 * for netdevice notification, and cleanup and put back the
 * reference if they receive an UNREGISTER event.
 * We can get stuck here if buggy protocols don't correctly
4484
 * call dev_put.
L
Linus Torvalds 已提交
4485 4486 4487 4488 4489 4490 4491 4492
 */
static void netdev_wait_allrefs(struct net_device *dev)
{
	unsigned long rebroadcast_time, warning_time;

	rebroadcast_time = warning_time = jiffies;
	while (atomic_read(&dev->refcnt) != 0) {
		if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
4493
			rtnl_lock();
L
Linus Torvalds 已提交
4494 4495

			/* Rebroadcast unregister notification */
4496
			call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
L
Linus Torvalds 已提交
4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508

			if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
				     &dev->state)) {
				/* We must not have linkwatch events
				 * pending on unregister. If this
				 * happens, we simply run the queue
				 * unscheduled, resulting in a noop
				 * for this device.
				 */
				linkwatch_run_queue();
			}

4509
			__rtnl_unlock();
L
Linus Torvalds 已提交
4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536 4537 4538 4539

			rebroadcast_time = jiffies;
		}

		msleep(250);

		if (time_after(jiffies, warning_time + 10 * HZ)) {
			printk(KERN_EMERG "unregister_netdevice: "
			       "waiting for %s to become free. Usage "
			       "count = %d\n",
			       dev->name, atomic_read(&dev->refcnt));
			warning_time = jiffies;
		}
	}
}

/* The sequence is:
 *
 *	rtnl_lock();
 *	...
 *	register_netdevice(x1);
 *	register_netdevice(x2);
 *	...
 *	unregister_netdevice(y1);
 *	unregister_netdevice(y2);
 *      ...
 *	rtnl_unlock();
 *	free_netdev(y1);
 *	free_netdev(y2);
 *
H
Herbert Xu 已提交
4540
 * We are invoked by rtnl_unlock().
L
Linus Torvalds 已提交
4541
 * This allows us to deal with problems:
4542
 * 1) We can delete sysfs objects which invoke hotplug
L
Linus Torvalds 已提交
4543 4544 4545
 *    without deadlocking with linkwatch via keventd.
 * 2) Since we run with the RTNL semaphore not held, we can sleep
 *    safely in order to wait for the netdev refcnt to drop to zero.
H
Herbert Xu 已提交
4546 4547 4548
 *
 * We must not return until all unregister events added during
 * the interval the lock was held have been completed.
L
Linus Torvalds 已提交
4549 4550 4551
 */
void netdev_run_todo(void)
{
4552
	struct list_head list;
L
Linus Torvalds 已提交
4553 4554

	/* Snapshot list, allow later requests */
4555
	list_replace_init(&net_todo_list, &list);
H
Herbert Xu 已提交
4556 4557

	__rtnl_unlock();
4558

L
Linus Torvalds 已提交
4559 4560 4561 4562 4563
	while (!list_empty(&list)) {
		struct net_device *dev
			= list_entry(list.next, struct net_device, todo_list);
		list_del(&dev->todo_list);

4564 4565 4566 4567 4568 4569
		if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
			printk(KERN_ERR "network todo '%s' but state %d\n",
			       dev->name, dev->reg_state);
			dump_stack();
			continue;
		}
L
Linus Torvalds 已提交
4570

4571
		dev->reg_state = NETREG_UNREGISTERED;
L
Linus Torvalds 已提交
4572

4573 4574
		on_each_cpu(flush_backlog, dev, 1);

4575
		netdev_wait_allrefs(dev);
L
Linus Torvalds 已提交
4576

4577 4578
		/* paranoia */
		BUG_ON(atomic_read(&dev->refcnt));
4579 4580 4581
		WARN_ON(dev->ip_ptr);
		WARN_ON(dev->ip6_ptr);
		WARN_ON(dev->dn_ptr);
L
Linus Torvalds 已提交
4582

4583 4584
		if (dev->destructor)
			dev->destructor(dev);
4585 4586 4587

		/* Free network device */
		kobject_put(&dev->dev.kobj);
L
Linus Torvalds 已提交
4588 4589 4590
	}
}

4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606
/**
 *	dev_get_stats	- get network device statistics
 *	@dev: device to get statistics from
 *
 *	Get network statistics from device. The device driver may provide
 *	its own method by setting dev->netdev_ops->get_stats; otherwise
 *	the internal statistics structure is used.
 */
const struct net_device_stats *dev_get_stats(struct net_device *dev)
 {
	const struct net_device_ops *ops = dev->netdev_ops;

	if (ops->ndo_get_stats)
		return ops->ndo_get_stats(dev);
	else
		return &dev->stats;
R
Rusty Russell 已提交
4607
}
4608
EXPORT_SYMBOL(dev_get_stats);
R
Rusty Russell 已提交
4609

4610
static void netdev_init_one_queue(struct net_device *dev,
4611 4612
				  struct netdev_queue *queue,
				  void *_unused)
4613 4614 4615 4616
{
	queue->dev = dev;
}

4617 4618
static void netdev_init_queues(struct net_device *dev)
{
4619 4620
	netdev_init_one_queue(dev, &dev->rx_queue, NULL);
	netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
4621
	spin_lock_init(&dev->tx_global_lock);
4622 4623
}

L
Linus Torvalds 已提交
4624
/**
4625
 *	alloc_netdev_mq - allocate network device
L
Linus Torvalds 已提交
4626 4627 4628
 *	@sizeof_priv:	size of private data to allocate space for
 *	@name:		device name format string
 *	@setup:		callback to initialize device
4629
 *	@queue_count:	the number of subqueues to allocate
L
Linus Torvalds 已提交
4630 4631
 *
 *	Allocates a struct net_device with private data area for driver use
4632 4633
 *	and performs basic initialization.  Also allocates subquue structs
 *	for each queue on the device at the end of the netdevice.
L
Linus Torvalds 已提交
4634
 */
4635 4636
struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
		void (*setup)(struct net_device *), unsigned int queue_count)
L
Linus Torvalds 已提交
4637
{
4638
	struct netdev_queue *tx;
L
Linus Torvalds 已提交
4639
	struct net_device *dev;
4640
	size_t alloc_size;
4641
	void *p;
L
Linus Torvalds 已提交
4642

4643 4644
	BUG_ON(strlen(name) >= sizeof(dev->name));

4645
	alloc_size = sizeof(struct net_device);
4646 4647 4648 4649 4650 4651 4652
	if (sizeof_priv) {
		/* ensure 32-byte alignment of private area */
		alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
		alloc_size += sizeof_priv;
	}
	/* ensure 32-byte alignment of whole construct */
	alloc_size += NETDEV_ALIGN_CONST;
L
Linus Torvalds 已提交
4653

4654
	p = kzalloc(alloc_size, GFP_KERNEL);
L
Linus Torvalds 已提交
4655
	if (!p) {
4656
		printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
L
Linus Torvalds 已提交
4657 4658 4659
		return NULL;
	}

4660
	tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
4661 4662 4663 4664 4665 4666 4667
	if (!tx) {
		printk(KERN_ERR "alloc_netdev: Unable to allocate "
		       "tx qdiscs.\n");
		kfree(p);
		return NULL;
	}

L
Linus Torvalds 已提交
4668 4669 4670
	dev = (struct net_device *)
		(((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
	dev->padded = (char *)dev - (char *)p;
4671
	dev_net_set(dev, &init_net);
L
Linus Torvalds 已提交
4672

4673 4674
	dev->_tx = tx;
	dev->num_tx_queues = queue_count;
4675
	dev->real_num_tx_queues = queue_count;
4676

4677
	dev->gso_max_size = GSO_MAX_SIZE;
L
Linus Torvalds 已提交
4678

4679 4680
	netdev_init_queues(dev);

4681
	INIT_LIST_HEAD(&dev->napi_list);
L
Linus Torvalds 已提交
4682 4683 4684 4685
	setup(dev);
	strcpy(dev->name, name);
	return dev;
}
4686
EXPORT_SYMBOL(alloc_netdev_mq);
L
Linus Torvalds 已提交
4687 4688 4689 4690 4691

/**
 *	free_netdev - free network device
 *	@dev: device
 *
4692 4693
 *	This function does the last stage of destroying an allocated device
 * 	interface. The reference to the device object is released.
L
Linus Torvalds 已提交
4694 4695 4696 4697
 *	If this is the last reference then it will be freed.
 */
void free_netdev(struct net_device *dev)
{
4698 4699
	struct napi_struct *p, *n;

4700 4701
	release_net(dev_net(dev));

4702 4703
	kfree(dev->_tx);

4704 4705 4706
	list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
		netif_napi_del(p);

S
Stephen Hemminger 已提交
4707
	/*  Compatibility with error handling in drivers */
L
Linus Torvalds 已提交
4708 4709 4710 4711 4712 4713 4714 4715
	if (dev->reg_state == NETREG_UNINITIALIZED) {
		kfree((char *)dev - dev->padded);
		return;
	}

	BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
	dev->reg_state = NETREG_RELEASED;

4716 4717
	/* will free via device release */
	put_device(&dev->dev);
L
Linus Torvalds 已提交
4718
}
4719

4720 4721 4722 4723 4724 4725
/**
 *	synchronize_net -  Synchronize with packet receive processing
 *
 *	Wait for packets currently being received to be done.
 *	Does not block later packets from starting.
 */
4726
void synchronize_net(void)
L
Linus Torvalds 已提交
4727 4728
{
	might_sleep();
4729
	synchronize_rcu();
L
Linus Torvalds 已提交
4730 4731 4732 4733 4734 4735 4736
}

/**
 *	unregister_netdevice - remove device from the kernel
 *	@dev: device
 *
 *	This function shuts down a device interface and removes it
4737
 *	from the kernel tables.
L
Linus Torvalds 已提交
4738 4739 4740 4741 4742
 *
 *	Callers must hold the rtnl semaphore.  You may want
 *	unregister_netdev() instead of this.
 */

4743
void unregister_netdevice(struct net_device *dev)
L
Linus Torvalds 已提交
4744
{
4745 4746
	ASSERT_RTNL();

4747
	rollback_registered(dev);
L
Linus Torvalds 已提交
4748 4749 4750 4751 4752 4753 4754 4755 4756
	/* Finish processing unregister after unlock */
	net_set_todo(dev);
}

/**
 *	unregister_netdev - remove device from the kernel
 *	@dev: device
 *
 *	This function shuts down a device interface and removes it
4757
 *	from the kernel tables.
L
Linus Torvalds 已提交
4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771
 *
 *	This is just a wrapper for unregister_netdevice that takes
 *	the rtnl semaphore.  In general you want to use this and not
 *	unregister_netdevice.
 */
void unregister_netdev(struct net_device *dev)
{
	rtnl_lock();
	unregister_netdevice(dev);
	rtnl_unlock();
}

EXPORT_SYMBOL(unregister_netdev);

4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798
/**
 *	dev_change_net_namespace - move device to different nethost namespace
 *	@dev: device
 *	@net: network namespace
 *	@pat: If not NULL name pattern to try if the current device name
 *	      is already taken in the destination network namespace.
 *
 *	This function shuts down a device interface and moves it
 *	to a new network namespace. On success 0 is returned, on
 *	a failure a netagive errno code is returned.
 *
 *	Callers must hold the rtnl semaphore.
 */

int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
{
	char buf[IFNAMSIZ];
	const char *destname;
	int err;

	ASSERT_RTNL();

	/* Don't allow namespace local devices to be moved. */
	err = -EINVAL;
	if (dev->features & NETIF_F_NETNS_LOCAL)
		goto out;

4799 4800 4801 4802 4803 4804 4805 4806 4807
#ifdef CONFIG_SYSFS
	/* Don't allow real devices to be moved when sysfs
	 * is enabled.
	 */
	err = -EINVAL;
	if (dev->dev.parent)
		goto out;
#endif

4808 4809 4810 4811 4812 4813 4814
	/* Ensure the device has been registrered */
	err = -EINVAL;
	if (dev->reg_state != NETREG_REGISTERED)
		goto out;

	/* Get out if there is nothing todo */
	err = 0;
4815
	if (net_eq(dev_net(dev), net))
4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842 4843
		goto out;

	/* Pick the destination device name, and ensure
	 * we can use it in the destination network namespace.
	 */
	err = -EEXIST;
	destname = dev->name;
	if (__dev_get_by_name(net, destname)) {
		/* We get here if we can't use the current device name */
		if (!pat)
			goto out;
		if (!dev_valid_name(pat))
			goto out;
		if (strchr(pat, '%')) {
			if (__dev_alloc_name(net, pat, buf) < 0)
				goto out;
			destname = buf;
		} else
			destname = pat;
		if (__dev_get_by_name(net, destname))
			goto out;
	}

	/*
	 * And now a mini version of register_netdevice unregister_netdevice.
	 */

	/* If device is running close it first. */
4844
	dev_close(dev);
4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864

	/* And unlink it from device chain */
	err = -ENODEV;
	unlist_netdevice(dev);

	synchronize_net();

	/* Shutdown queueing discipline. */
	dev_shutdown(dev);

	/* Notify protocols, that we are about to destroy
	   this device. They should clean all the things.
	*/
	call_netdevice_notifiers(NETDEV_UNREGISTER, dev);

	/*
	 *	Flush the unicast and multicast chains
	 */
	dev_addr_discard(dev);

4865 4866
	netdev_unregister_kobject(dev);

4867
	/* Actually switch the network namespace */
4868
	dev_net_set(dev, net);
4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881

	/* Assign the new device name */
	if (destname != dev->name)
		strcpy(dev->name, destname);

	/* If there is an ifindex conflict assign a new one */
	if (__dev_get_by_index(net, dev->ifindex)) {
		int iflink = (dev->iflink == dev->ifindex);
		dev->ifindex = dev_new_index(net);
		if (iflink)
			dev->iflink = dev->ifindex;
	}

4882
	/* Fixup kobjects */
4883
	err = netdev_register_kobject(dev);
4884
	WARN_ON(err);
4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897

	/* Add the device back in the hashes */
	list_netdevice(dev);

	/* Notify protocols, that a new device appeared. */
	call_netdevice_notifiers(NETDEV_REGISTER, dev);

	synchronize_net();
	err = 0;
out:
	return err;
}

L
Linus Torvalds 已提交
4898 4899 4900 4901 4902
static int dev_cpu_callback(struct notifier_block *nfb,
			    unsigned long action,
			    void *ocpu)
{
	struct sk_buff **list_skb;
4903
	struct Qdisc **list_net;
L
Linus Torvalds 已提交
4904 4905 4906 4907
	struct sk_buff *skb;
	unsigned int cpu, oldcpu = (unsigned long)ocpu;
	struct softnet_data *sd, *oldsd;

4908
	if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
L
Linus Torvalds 已提交
4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942
		return NOTIFY_OK;

	local_irq_disable();
	cpu = smp_processor_id();
	sd = &per_cpu(softnet_data, cpu);
	oldsd = &per_cpu(softnet_data, oldcpu);

	/* Find end of our completion_queue. */
	list_skb = &sd->completion_queue;
	while (*list_skb)
		list_skb = &(*list_skb)->next;
	/* Append completion queue from offline CPU. */
	*list_skb = oldsd->completion_queue;
	oldsd->completion_queue = NULL;

	/* Find end of our output_queue. */
	list_net = &sd->output_queue;
	while (*list_net)
		list_net = &(*list_net)->next_sched;
	/* Append output queue from offline CPU. */
	*list_net = oldsd->output_queue;
	oldsd->output_queue = NULL;

	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	local_irq_enable();

	/* Process offline CPU's input_pkt_queue */
	while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
		netif_rx(skb);

	return NOTIFY_OK;
}


4943
/**
4944 4945 4946 4947
 *	netdev_increment_features - increment feature set by one
 *	@all: current feature set
 *	@one: new feature set
 *	@mask: mask feature set
4948 4949
 *
 *	Computes a new feature set after adding a device with feature set
4950 4951
 *	@one to the master device with current feature set @all.  Will not
 *	enable anything that is off in @mask. Returns the new feature set.
4952
 */
4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965
unsigned long netdev_increment_features(unsigned long all, unsigned long one,
					unsigned long mask)
{
	/* If device needs checksumming, downgrade to it. */
        if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
		all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
	else if (mask & NETIF_F_ALL_CSUM) {
		/* If one device supports v4/v6 checksumming, set for all. */
		if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
		    !(all & NETIF_F_GEN_CSUM)) {
			all &= ~NETIF_F_ALL_CSUM;
			all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
		}
4966

4967 4968 4969 4970 4971 4972
		/* If one device supports hw checksumming, set for all. */
		if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
			all &= ~NETIF_F_ALL_CSUM;
			all |= NETIF_F_HW_CSUM;
		}
	}
4973

4974
	one |= NETIF_F_ALL_CSUM;
4975

4976 4977 4978
	one |= all & NETIF_F_ONE_FOR_ALL;
	all &= one | NETIF_F_LLTX | NETIF_F_GSO;
	all |= one & mask & NETIF_F_ONE_FOR_ALL;
4979 4980 4981

	return all;
}
4982
EXPORT_SYMBOL(netdev_increment_features);
4983

4984 4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996
static struct hlist_head *netdev_create_hash(void)
{
	int i;
	struct hlist_head *hash;

	hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
	if (hash != NULL)
		for (i = 0; i < NETDEV_HASHENTRIES; i++)
			INIT_HLIST_HEAD(&hash[i]);

	return hash;
}

4997
/* Initialize per network namespace state */
4998
static int __net_init netdev_init(struct net *net)
4999 5000 5001
{
	INIT_LIST_HEAD(&net->dev_base_head);

5002 5003 5004
	net->dev_name_head = netdev_create_hash();
	if (net->dev_name_head == NULL)
		goto err_name;
5005

5006 5007 5008
	net->dev_index_head = netdev_create_hash();
	if (net->dev_index_head == NULL)
		goto err_idx;
5009 5010

	return 0;
5011 5012 5013 5014 5015

err_idx:
	kfree(net->dev_name_head);
err_name:
	return -ENOMEM;
5016 5017
}

5018 5019 5020 5021 5022 5023 5024 5025
/**
 *	netdev_drivername - network driver for the device
 *	@dev: network device
 *	@buffer: buffer for resulting name
 *	@len: size of buffer
 *
 *	Determine network driver for device.
 */
5026
char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5027
{
5028 5029
	const struct device_driver *driver;
	const struct device *parent;
5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045

	if (len <= 0 || !buffer)
		return buffer;
	buffer[0] = 0;

	parent = dev->dev.parent;

	if (!parent)
		return buffer;

	driver = parent->driver;
	if (driver && driver->name)
		strlcpy(buffer, driver->name, len);
	return buffer;
}

5046
static void __net_exit netdev_exit(struct net *net)
5047 5048 5049 5050 5051
{
	kfree(net->dev_name_head);
	kfree(net->dev_index_head);
}

5052
static struct pernet_operations __net_initdata netdev_net_ops = {
5053 5054 5055 5056
	.init = netdev_init,
	.exit = netdev_exit,
};

5057
static void __net_exit default_device_exit(struct net *net)
5058
{
5059
	struct net_device *dev;
5060 5061 5062 5063 5064
	/*
	 * Push all migratable of the network devices back to the
	 * initial network namespace
	 */
	rtnl_lock();
5065 5066
restart:
	for_each_netdev(net, dev) {
5067
		int err;
5068
		char fb_name[IFNAMSIZ];
5069 5070 5071 5072 5073

		/* Ignore unmoveable devices (i.e. loopback) */
		if (dev->features & NETIF_F_NETNS_LOCAL)
			continue;

5074 5075 5076
		/* Delete virtual devices */
		if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) {
			dev->rtnl_link_ops->dellink(dev);
5077
			goto restart;
5078 5079
		}

5080
		/* Push remaing network devices to init_net */
5081 5082
		snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
		err = dev_change_net_namespace(dev, &init_net, fb_name);
5083
		if (err) {
5084
			printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5085
				__func__, dev->name, err);
5086
			BUG();
5087
		}
5088
		goto restart;
5089 5090 5091 5092
	}
	rtnl_unlock();
}

5093
static struct pernet_operations __net_initdata default_device_ops = {
5094 5095 5096
	.exit = default_device_exit,
};

L
Linus Torvalds 已提交
5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116
/*
 *	Initialize the DEV module. At boot time this walks the device list and
 *	unhooks any devices that fail to initialise (normally hardware not
 *	present) and leaves us with a valid list of present and active devices.
 *
 */

/*
 *       This is called single threaded during boot, so no need
 *       to take the rtnl semaphore.
 */
static int __init net_dev_init(void)
{
	int i, rc = -ENOMEM;

	BUG_ON(!dev_boot_phase);

	if (dev_proc_init())
		goto out;

5117
	if (netdev_kobject_init())
L
Linus Torvalds 已提交
5118 5119 5120
		goto out;

	INIT_LIST_HEAD(&ptype_all);
5121
	for (i = 0; i < PTYPE_HASH_SIZE; i++)
L
Linus Torvalds 已提交
5122 5123
		INIT_LIST_HEAD(&ptype_base[i]);

5124 5125
	if (register_pernet_subsys(&netdev_net_ops))
		goto out;
L
Linus Torvalds 已提交
5126 5127 5128 5129 5130

	/*
	 *	Initialise the packet receive queues.
	 */

5131
	for_each_possible_cpu(i) {
L
Linus Torvalds 已提交
5132 5133 5134 5135 5136 5137
		struct softnet_data *queue;

		queue = &per_cpu(softnet_data, i);
		skb_queue_head_init(&queue->input_pkt_queue);
		queue->completion_queue = NULL;
		INIT_LIST_HEAD(&queue->poll_list);
5138 5139 5140

		queue->backlog.poll = process_backlog;
		queue->backlog.weight = weight_p;
5141
		queue->backlog.gro_list = NULL;
L
Linus Torvalds 已提交
5142 5143 5144 5145
	}

	dev_boot_phase = 0;

5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160
	/* The loopback device is special if any other network devices
	 * is present in a network namespace the loopback device must
	 * be present. Since we now dynamically allocate and free the
	 * loopback device ensure this invariant is maintained by
	 * keeping the loopback device as the first device on the
	 * list of network devices.  Ensuring the loopback devices
	 * is the first device that appears and the last network device
	 * that disappears.
	 */
	if (register_pernet_device(&loopback_net_ops))
		goto out;

	if (register_pernet_device(&default_device_ops))
		goto out;

5161 5162
	open_softirq(NET_TX_SOFTIRQ, net_tx_action);
	open_softirq(NET_RX_SOFTIRQ, net_rx_action);
L
Linus Torvalds 已提交
5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176

	hotcpu_notifier(dev_cpu_callback, 0);
	dst_init();
	dev_mcast_init();
	rc = 0;
out:
	return rc;
}

subsys_initcall(net_dev_init);

EXPORT_SYMBOL(__dev_get_by_index);
EXPORT_SYMBOL(__dev_get_by_name);
EXPORT_SYMBOL(__dev_remove_pack);
5177
EXPORT_SYMBOL(dev_valid_name);
L
Linus Torvalds 已提交
5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217
EXPORT_SYMBOL(dev_add_pack);
EXPORT_SYMBOL(dev_alloc_name);
EXPORT_SYMBOL(dev_close);
EXPORT_SYMBOL(dev_get_by_flags);
EXPORT_SYMBOL(dev_get_by_index);
EXPORT_SYMBOL(dev_get_by_name);
EXPORT_SYMBOL(dev_open);
EXPORT_SYMBOL(dev_queue_xmit);
EXPORT_SYMBOL(dev_remove_pack);
EXPORT_SYMBOL(dev_set_allmulti);
EXPORT_SYMBOL(dev_set_promiscuity);
EXPORT_SYMBOL(dev_change_flags);
EXPORT_SYMBOL(dev_set_mtu);
EXPORT_SYMBOL(dev_set_mac_address);
EXPORT_SYMBOL(free_netdev);
EXPORT_SYMBOL(netdev_boot_setup_check);
EXPORT_SYMBOL(netdev_set_master);
EXPORT_SYMBOL(netdev_state_change);
EXPORT_SYMBOL(netif_receive_skb);
EXPORT_SYMBOL(netif_rx);
EXPORT_SYMBOL(register_gifconf);
EXPORT_SYMBOL(register_netdevice);
EXPORT_SYMBOL(register_netdevice_notifier);
EXPORT_SYMBOL(skb_checksum_help);
EXPORT_SYMBOL(synchronize_net);
EXPORT_SYMBOL(unregister_netdevice);
EXPORT_SYMBOL(unregister_netdevice_notifier);
EXPORT_SYMBOL(net_enable_timestamp);
EXPORT_SYMBOL(net_disable_timestamp);
EXPORT_SYMBOL(dev_get_flags);

#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
EXPORT_SYMBOL(br_handle_frame_hook);
EXPORT_SYMBOL(br_fdb_get_hook);
EXPORT_SYMBOL(br_fdb_put_hook);
#endif

EXPORT_SYMBOL(dev_load);

EXPORT_PER_CPU_SYMBOL(softnet_data);