dev.c 117.9 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/kallsyms.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>
#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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/*
 *	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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#ifdef CONFIG_NET_DMA
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struct net_dma {
	struct dma_client client;
	spinlock_t lock;
	cpumask_t channel_mask;
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	struct dma_chan **channels;
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};

static enum dma_state_client
netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
	enum dma_state state);

static struct net_dma net_dma = {
	.client = {
		.event_callback = netdev_dma_event,
	},
};
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#endif

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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,
	 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_VOID,
	 ARPHRD_NONE};

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",
	 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_VOID",
	 "_xmit_NONE"};

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
582
 *	@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.
 */

592
struct net_device *__dev_get_by_name(struct net *net, const char *name)
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{
	struct hlist_node *p;

596
	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
607
 *	@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.
 */

617
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);
622
	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
631
 *	@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.
 */

641
struct net_device *__dev_get_by_index(struct net *net, int ifindex)
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{
	struct hlist_node *p;

645
	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
657
 *	@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.
 */

666
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);
671
	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
680
 *	@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
 */

693
struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
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{
	struct net_device *dev;

	ASSERT_RTNL();

699
	for_each_netdev(net, dev)
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		if (dev->type == type &&
		    !memcmp(dev->dev_addr, ha, dev->addr_len))
702 703 704
			return dev;

	return NULL;
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}

707 708
EXPORT_SYMBOL(dev_getbyhwaddr);

709
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
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{
	struct net_device *dev;

713
	ASSERT_RTNL();
714
	for_each_netdev(net, dev)
715
		if (dev->type == type)
716 717 718
			return dev;

	return NULL;
719 720 721 722
}

EXPORT_SYMBOL(__dev_getfirstbyhwtype);

723
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
724 725 726 727
{
	struct net_device *dev;

	rtnl_lock();
728
	dev = __dev_getfirstbyhwtype(net, type);
729 730
	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
739
 *	@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
744
 *	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.
 */

749
struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask)
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{
751
	struct net_device *dev, *ret;
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752

753
	ret = NULL;
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	read_lock(&dev_base_lock);
755
	for_each_netdev(net, dev) {
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		if (((dev->flags ^ if_flags) & mask) == 0) {
			dev_hold(dev);
758
			ret = dev;
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			break;
		}
	}
	read_unlock(&dev_base_lock);
763
	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
771 772
 *	to allow sysfs to work.  We also disallow any kind of
 *	whitespace.
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 */
774
int dev_valid_name(const char *name)
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{
776 777
	if (*name == '\0')
		return 0;
778 779
	if (strlen(name) >= IFNAMSIZ)
		return 0;
780 781 782 783 784 785 786 787 788
	if (!strcmp(name, ".") || !strcmp(name, ".."))
		return 0;

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

/**
792 793
 *	__dev_alloc_name - allocate a name for a device
 *	@net: network namespace to allocate the device name in
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 *	@name: name format string
795
 *	@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
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 *	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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 */

806
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;
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	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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		inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
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		if (!inuse)
			return -ENOMEM;

829
		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 */
836
			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);
	}

845 846
	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;
}

856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875
/**
 *	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;

876 877
	BUG_ON(!dev_net(dev));
	net = dev_net(dev);
878 879 880 881 882 883
	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.
 */
int dev_change_name(struct net_device *dev, char *newname)
{
895
	char oldname[IFNAMSIZ];
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	int err = 0;
897
	int ret;
898
	struct net *net;
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	ASSERT_RTNL();
901
	BUG_ON(!dev_net(dev));
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903
	net = dev_net(dev);
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	if (dev->flags & IFF_UP)
		return -EBUSY;

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

910 911 912
	if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
		return 0;

913 914
	memcpy(oldname, dev->name, IFNAMSIZ);

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	if (strchr(newname, '%')) {
		err = dev_alloc_name(dev, newname);
		if (err < 0)
			return err;
		strcpy(newname, dev->name);
	}
921
	else if (__dev_get_by_name(net, newname))
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		return -EEXIST;
	else
		strlcpy(dev->name, newname, IFNAMSIZ);

926
rollback:
927 928 929 930 931
	err = device_rename(&dev->dev, dev->name);
	if (err) {
		memcpy(dev->name, oldname, IFNAMSIZ);
		return err;
	}
932 933

	write_lock_bh(&dev_base_lock);
934
	hlist_del(&dev->name_hlist);
935
	hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
936 937
	write_unlock_bh(&dev_base_lock);

938
	ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
939 940 941 942 943 944 945 946 947 948 949 950 951
	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;
}

956
/**
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Stephen Hemminger 已提交
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 *	netdev_features_change - device changes features
958 959 960 961 962 963
 *	@dev: device to cause notification
 *
 *	Called to indicate a device has changed features.
 */
void netdev_features_change(struct net_device *dev)
{
964
	call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
965 966 967
}
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) {
979
		call_netdevice_notifiers(NETDEV_CHANGE, dev);
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		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
	}
}

984 985 986 987 988 989
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
992
 *	@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.
 */

1000
void dev_load(struct net *net, const char *name)
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{
1002
	struct net_device *dev;
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	read_lock(&dev_base_lock);
1005
	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)
{
	int ret = 0;

1028 1029
	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);
1047 1048 1049 1050 1051

	if (dev->validate_addr)
		ret = dev->validate_addr(dev);

	if (!ret && dev->open)
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		ret = dev->open(dev);

1054
	/*
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	 *	If it went open OK then:
	 */

1058 1059 1060
	if (ret)
		clear_bit(__LINK_STATE_START, &dev->state);
	else {
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		/*
		 *	Set the flags.
		 */
		dev->flags |= IFF_UP;

		/*
		 *	Initialize multicasting status
		 */
1069
		dev_set_rx_mode(dev);
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		/*
		 *	Wakeup transmit queue engine
		 */
		dev_activate(dev);

		/*
		 *	... and announce new interface.
		 */
1079
		call_netdevice_notifiers(NETDEV_UP, dev);
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	}
1081

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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)
{
1096 1097
	ASSERT_RTNL();

1098 1099
	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.
	 */
1107
	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,
1112 1113 1114 1115 1116
	 * 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(). */

1119 1120
	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.
	 */
	if (dev->stop)
		dev->stop(dev);

	/*
	 *	Device is now down.
	 */

	dev->flags &= ~IFF_UP;

	/*
	 * Tell people we are down
	 */
1140
	call_netdevice_notifiers(NETDEV_DOWN, dev);
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	return 0;
}


1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168
/**
 *	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);


1169 1170
static int dev_boot_phase = 1;

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/*
 *	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
1186
 *	to the new notifier to allow device to have a race free
L
Linus Torvalds 已提交
1187 1188 1189 1190 1191 1192
 *	view of the network device list.
 */

int register_netdevice_notifier(struct notifier_block *nb)
{
	struct net_device *dev;
1193
	struct net_device *last;
1194
	struct net *net;
L
Linus Torvalds 已提交
1195 1196 1197
	int err;

	rtnl_lock();
1198
	err = raw_notifier_chain_register(&netdev_chain, nb);
1199 1200
	if (err)
		goto unlock;
1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211
	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
1212

1213 1214
			nb->notifier_call(nb, NETDEV_UP, dev);
		}
L
Linus Torvalds 已提交
1215
	}
1216 1217

unlock:
L
Linus Torvalds 已提交
1218 1219
	rtnl_unlock();
	return err;
1220 1221 1222

rollback:
	last = dev;
1223 1224 1225 1226
	for_each_net(net) {
		for_each_netdev(net, dev) {
			if (dev == last)
				break;
1227

1228 1229 1230 1231 1232
			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);
1233 1234
		}
	}
1235 1236

	raw_notifier_chain_unregister(&netdev_chain, nb);
1237
	goto unlock;
L
Linus Torvalds 已提交
1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251
}

/**
 *	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)
{
1252 1253 1254
	int err;

	rtnl_lock();
1255
	err = raw_notifier_chain_unregister(&netdev_chain, nb);
1256 1257
	rtnl_unlock();
	return err;
L
Linus Torvalds 已提交
1258 1259 1260 1261 1262
}

/**
 *	call_netdevice_notifiers - call all network notifier blocks
 *      @val: value passed unmodified to notifier function
1263
 *      @dev: net_device pointer passed unmodified to notifier function
L
Linus Torvalds 已提交
1264 1265
 *
 *	Call all network notifier blocks.  Parameters and return value
1266
 *	are as for raw_notifier_call_chain().
L
Linus Torvalds 已提交
1267 1268
 */

1269
int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
L
Linus Torvalds 已提交
1270
{
1271
	return raw_notifier_call_chain(&netdev_chain, val, dev);
L
Linus Torvalds 已提交
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286
}

/* 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);
}

1287
static inline void net_timestamp(struct sk_buff *skb)
L
Linus Torvalds 已提交
1288 1289
{
	if (atomic_read(&netstamp_needed))
1290
		__net_timestamp(skb);
1291 1292
	else
		skb->tstamp.tv64 = 0;
L
Linus Torvalds 已提交
1293 1294 1295 1296 1297 1298 1299
}

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

1300
static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
L
Linus Torvalds 已提交
1301 1302
{
	struct packet_type *ptype;
1303 1304

	net_timestamp(skb);
L
Linus Torvalds 已提交
1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321

	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.
			 */
1322
			skb_reset_mac_header(skb2);
L
Linus Torvalds 已提交
1323

1324
			if (skb_network_header(skb2) < skb2->data ||
1325
			    skb2->network_header > skb2->tail) {
L
Linus Torvalds 已提交
1326 1327 1328 1329
				if (net_ratelimit())
					printk(KERN_CRIT "protocol %04x is "
					       "buggy, dev %s\n",
					       skb2->protocol, dev->name);
1330
				skb_reset_network_header(skb2);
L
Linus Torvalds 已提交
1331 1332
			}

1333
			skb2->transport_header = skb2->network_header;
L
Linus Torvalds 已提交
1334
			skb2->pkt_type = PACKET_OUTGOING;
D
David S. Miller 已提交
1335
			ptype->func(skb2, skb->dev, ptype, skb->dev);
L
Linus Torvalds 已提交
1336 1337 1338 1339 1340
		}
	}
	rcu_read_unlock();
}

1341

1342
static inline void __netif_reschedule(struct Qdisc *q)
1343
{
1344 1345
	struct softnet_data *sd;
	unsigned long flags;
1346

1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358
	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);
1359 1360 1361
}
EXPORT_SYMBOL(__netif_schedule);

1362
void dev_kfree_skb_irq(struct sk_buff *skb)
1363
{
1364 1365 1366
	if (atomic_dec_and_test(&skb->users)) {
		struct softnet_data *sd;
		unsigned long flags;
1367

1368 1369 1370 1371 1372 1373 1374
		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);
	}
1375
}
1376
EXPORT_SYMBOL(dev_kfree_skb_irq);
1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387

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);


1388 1389 1390 1391 1392 1393
/**
 * netif_device_detach - mark device as removed
 * @dev: network device
 *
 * Mark device as removed from system and therefore no longer available.
 */
1394 1395 1396 1397 1398 1399 1400 1401 1402
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);

1403 1404 1405 1406 1407 1408
/**
 * netif_device_attach - mark device as attached
 * @dev: network device
 *
 * Mark device as attached from system and restart if needed.
 */
1409 1410 1411 1412 1413
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);
1414
		__netdev_watchdog_up(dev);
1415 1416 1417 1418
	}
}
EXPORT_SYMBOL(netif_device_attach);

1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441
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;
}
1442

L
Linus Torvalds 已提交
1443 1444 1445 1446
/*
 * Invalidate hardware checksum when packet is to be mangled, and
 * complete checksum manually on outgoing path.
 */
1447
int skb_checksum_help(struct sk_buff *skb)
L
Linus Torvalds 已提交
1448
{
1449
	__wsum csum;
1450
	int ret = 0, offset;
L
Linus Torvalds 已提交
1451

1452
	if (skb->ip_summed == CHECKSUM_COMPLETE)
1453 1454 1455 1456 1457
		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
1458 1459
	}

1460 1461 1462 1463 1464 1465 1466 1467 1468
	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
1469 1470 1471 1472 1473
		ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
		if (ret)
			goto out;
	}

1474
	*(__sum16 *)(skb->data + offset) = csum_fold(csum);
1475
out_set_summed:
L
Linus Torvalds 已提交
1476
	skb->ip_summed = CHECKSUM_NONE;
1477
out:
L
Linus Torvalds 已提交
1478 1479 1480
	return ret;
}

1481 1482 1483
/**
 *	skb_gso_segment - Perform segmentation on skb.
 *	@skb: buffer to segment
1484
 *	@features: features for the output path (see dev->features)
1485 1486
 *
 *	This function segments the given skb and returns a list of segments.
1487 1488 1489
 *
 *	It may return NULL if the skb requires no segmentation.  This is
 *	only possible when GSO is used for verifying header integrity.
1490
 */
1491
struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1492 1493 1494
{
	struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
	struct packet_type *ptype;
A
Al Viro 已提交
1495
	__be16 type = skb->protocol;
1496
	int err;
1497 1498 1499

	BUG_ON(skb_shinfo(skb)->frag_list);

1500
	skb_reset_mac_header(skb);
1501
	skb->mac_len = skb->network_header - skb->mac_header;
1502 1503
	__skb_pull(skb, skb->mac_len);

1504
	if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) {
1505 1506 1507 1508 1509
		if (skb_header_cloned(skb) &&
		    (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
			return ERR_PTR(err);
	}

1510
	rcu_read_lock();
1511 1512
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1513
		if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1514
			if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1515 1516 1517 1518
				err = ptype->gso_send_check(skb);
				segs = ERR_PTR(err);
				if (err || skb_gso_ok(skb, features))
					break;
1519 1520
				__skb_push(skb, (skb->data -
						 skb_network_header(skb)));
1521
			}
1522
			segs = ptype->gso_segment(skb, features);
1523 1524 1525 1526 1527
			break;
		}
	}
	rcu_read_unlock();

1528
	__skb_push(skb, skb->data - skb_mac_header(skb));
1529

1530 1531 1532 1533 1534
	return segs;
}

EXPORT_SYMBOL(skb_gso_segment);

1535 1536 1537 1538 1539
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG
void netdev_rx_csum_fault(struct net_device *dev)
{
	if (net_ratelimit()) {
1540
		printk(KERN_ERR "%s: hw csum failure.\n",
1541
			dev ? dev->name : "<unknown>");
1542 1543 1544 1545 1546 1547
		dump_stack();
	}
}
EXPORT_SYMBOL(netdev_rx_csum_fault);
#endif

L
Linus Torvalds 已提交
1548 1549 1550 1551 1552 1553 1554
/* 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)
{
1555
#ifdef CONFIG_HIGHMEM
L
Linus Torvalds 已提交
1556 1557 1558 1559 1560 1561 1562 1563 1564
	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;

1565
#endif
L
Linus Torvalds 已提交
1566 1567 1568
	return 0;
}

1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602
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;
1603 1604 1605 1606 1607 1608 1609 1610
	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;
1611

1612
	if (IS_ERR(segs))
1613 1614 1615 1616 1617 1618 1619 1620 1621
		return PTR_ERR(segs);

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

	return 0;
}

1622 1623
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
			struct netdev_queue *txq)
1624 1625
{
	if (likely(!skb->next)) {
S
Stephen Hemminger 已提交
1626
		if (!list_empty(&ptype_all))
1627 1628
			dev_queue_xmit_nit(skb, dev);

1629 1630 1631 1632 1633 1634
		if (netif_needs_gso(dev, skb)) {
			if (unlikely(dev_gso_segment(skb)))
				goto out_kfree_skb;
			if (skb->next)
				goto gso;
		}
1635

1636
		return dev->hard_start_xmit(skb, dev);
1637 1638
	}

1639
gso:
1640 1641 1642 1643 1644 1645 1646 1647
	do {
		struct sk_buff *nskb = skb->next;
		int rc;

		skb->next = nskb->next;
		nskb->next = NULL;
		rc = dev->hard_start_xmit(nskb, dev);
		if (unlikely(rc)) {
1648
			nskb->next = skb->next;
1649 1650 1651
			skb->next = nskb;
			return rc;
		}
1652
		if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1653
			return NETDEV_TX_BUSY;
1654
	} while (skb->next);
1655

1656 1657 1658 1659 1660 1661 1662
	skb->destructor = DEV_GSO_CB(skb)->destructor;

out_kfree_skb:
	kfree_skb(skb);
	return 0;
}

D
David S. Miller 已提交
1663 1664 1665
static u32 simple_tx_hashrnd;
static int simple_tx_hashrnd_initialized = 0;

1666 1667
static u16 simple_tx_hash(struct net_device *dev, struct sk_buff *skb)
{
D
David S. Miller 已提交
1668 1669
	u32 addr1, addr2, ports;
	u32 hash, ihl;
1670
	u8 ip_proto;
D
David S. Miller 已提交
1671 1672 1673 1674 1675

	if (unlikely(!simple_tx_hashrnd_initialized)) {
		get_random_bytes(&simple_tx_hashrnd, 4);
		simple_tx_hashrnd_initialized = 1;
	}
1676 1677 1678 1679

	switch (skb->protocol) {
	case __constant_htons(ETH_P_IP):
		ip_proto = ip_hdr(skb)->protocol;
D
David S. Miller 已提交
1680 1681
		addr1 = ip_hdr(skb)->saddr;
		addr2 = ip_hdr(skb)->daddr;
1682 1683 1684 1685
		ihl = ip_hdr(skb)->ihl;
		break;
	case __constant_htons(ETH_P_IPV6):
		ip_proto = ipv6_hdr(skb)->nexthdr;
D
David S. Miller 已提交
1686 1687
		addr1 = ipv6_hdr(skb)->saddr.s6_addr32[3];
		addr2 = ipv6_hdr(skb)->daddr.s6_addr32[3];
1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702
		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
1703
		ports = *((u32 *) (skb_network_header(skb) + (ihl * 4)));
1704 1705 1706
		break;

	default:
D
David S. Miller 已提交
1707
		ports = 0;
1708 1709 1710
		break;
	}

D
David S. Miller 已提交
1711 1712 1713
	hash = jhash_3words(addr1, addr2, ports, simple_tx_hashrnd);

	return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1714 1715
}

1716 1717 1718
static struct netdev_queue *dev_pick_tx(struct net_device *dev,
					struct sk_buff *skb)
{
1719 1720
	u16 queue_index = 0;

1721 1722
	if (dev->select_queue)
		queue_index = dev->select_queue(dev, skb);
1723 1724
	else if (dev->real_num_tx_queues > 1)
		queue_index = simple_tx_hash(dev, skb);
1725

1726 1727
	skb_set_queue_mapping(skb, queue_index);
	return netdev_get_tx_queue(dev, queue_index);
1728 1729
}

1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754
/**
 *	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
1755 1756 1757
int dev_queue_xmit(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
1758
	struct netdev_queue *txq;
L
Linus Torvalds 已提交
1759 1760 1761
	struct Qdisc *q;
	int rc = -ENOMEM;

1762 1763 1764 1765
	/* GSO will handle the following emulations directly. */
	if (netif_needs_gso(dev, skb))
		goto gso;

L
Linus Torvalds 已提交
1766 1767
	if (skb_shinfo(skb)->frag_list &&
	    !(dev->features & NETIF_F_FRAGLIST) &&
H
Herbert Xu 已提交
1768
	    __skb_linearize(skb))
L
Linus Torvalds 已提交
1769 1770 1771 1772 1773 1774 1775 1776
		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
1777
	    __skb_linearize(skb))
L
Linus Torvalds 已提交
1778 1779 1780 1781 1782
		goto out_kfree_skb;

	/* If packet is not checksummed and device does not support
	 * checksumming for this protocol, complete checksumming here.
	 */
1783 1784 1785
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
		skb_set_transport_header(skb, skb->csum_start -
					      skb_headroom(skb));
1786 1787
		if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
			goto out_kfree_skb;
1788
	}
L
Linus Torvalds 已提交
1789

1790
gso:
1791 1792
	/* Disable soft irqs for various locks below. Also
	 * stops preemption for RCU.
L
Linus Torvalds 已提交
1793
	 */
1794
	rcu_read_lock_bh();
L
Linus Torvalds 已提交
1795

1796
	txq = dev_pick_tx(dev, skb);
1797
	q = rcu_dereference(txq->qdisc);
1798

L
Linus Torvalds 已提交
1799 1800 1801 1802
#ifdef CONFIG_NET_CLS_ACT
	skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
#endif
	if (q->enqueue) {
1803
		spinlock_t *root_lock = qdisc_lock(q);
1804 1805 1806

		spin_lock(root_lock);

1807
		if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
1808
			kfree_skb(skb);
1809
			rc = NET_XMIT_DROP;
1810 1811 1812
		} else {
			rc = qdisc_enqueue_root(skb, q);
			qdisc_run(q);
1813
		}
1814 1815 1816
		spin_unlock(root_lock);

		goto out;
L
Linus Torvalds 已提交
1817 1818 1819 1820 1821
	}

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

H
Herbert Xu 已提交
1822 1823
	   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
1824 1825 1826 1827 1828 1829 1830 1831 1832 1833
	   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 */

1834
		if (txq->xmit_lock_owner != cpu) {
L
Linus Torvalds 已提交
1835

1836
			HARD_TX_LOCK(dev, txq, cpu);
L
Linus Torvalds 已提交
1837

1838
			if (!netif_tx_queue_stopped(txq)) {
L
Linus Torvalds 已提交
1839
				rc = 0;
1840
				if (!dev_hard_start_xmit(skb, dev, txq)) {
1841
					HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
1842 1843 1844
					goto out;
				}
			}
1845
			HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
			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;
1859
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
1860 1861 1862 1863 1864

out_kfree_skb:
	kfree_skb(skb);
	return rc;
out:
1865
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
1866 1867 1868 1869 1870 1871 1872 1873
	return rc;
}


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

1874 1875 1876
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
1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904

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;

1905
	if (!skb->tstamp.tv64)
1906
		net_timestamp(skb);
L
Linus Torvalds 已提交
1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920

	/*
	 * 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);
1921
			return NET_RX_SUCCESS;
L
Linus Torvalds 已提交
1922 1923
		}

1924
		napi_schedule(&queue->backlog);
L
Linus Torvalds 已提交
1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965
		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;

1966
			WARN_ON(atomic_read(&skb->users));
L
Linus Torvalds 已提交
1967 1968 1969 1970 1971
			__kfree_skb(skb);
		}
	}

	if (sd->output_queue) {
1972
		struct Qdisc *head;
L
Linus Torvalds 已提交
1973 1974 1975 1976 1977 1978 1979

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

		while (head) {
1980 1981 1982
			struct Qdisc *q = head;
			spinlock_t *root_lock;

L
Linus Torvalds 已提交
1983 1984
			head = head->next_sched;

1985
			root_lock = qdisc_lock(q);
1986
			if (spin_trylock(root_lock)) {
1987 1988 1989
				smp_mb__before_clear_bit();
				clear_bit(__QDISC_STATE_SCHED,
					  &q->state);
1990 1991
				qdisc_run(q);
				spin_unlock(root_lock);
L
Linus Torvalds 已提交
1992
			} else {
1993
				if (!test_bit(__QDISC_STATE_DEACTIVATED,
1994
					      &q->state)) {
1995
					__netif_reschedule(q);
1996 1997 1998 1999 2000
				} else {
					smp_mb__before_clear_bit();
					clear_bit(__QDISC_STATE_SCHED,
						  &q->state);
				}
L
Linus Torvalds 已提交
2001 2002 2003 2004 2005
			}
		}
	}
}

2006 2007 2008
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
2009 2010
{
	atomic_inc(&skb->users);
D
David S. Miller 已提交
2011
	return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2012 2013 2014
}

#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2015
/* These hooks defined here for ATM */
L
Linus Torvalds 已提交
2016 2017 2018
struct net_bridge;
struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
						unsigned char *addr);
2019
void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
L
Linus Torvalds 已提交
2020

2021 2022 2023 2024 2025 2026 2027 2028 2029
/*
 * 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
2030 2031 2032
{
	struct net_bridge_port *port;

2033 2034 2035
	if (skb->pkt_type == PACKET_LOOPBACK ||
	    (port = rcu_dereference(skb->dev->br_port)) == NULL)
		return skb;
L
Linus Torvalds 已提交
2036 2037

	if (*pt_prev) {
2038
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
L
Linus Torvalds 已提交
2039
		*pt_prev = NULL;
2040 2041
	}

2042
	return br_handle_frame_hook(port, skb);
L
Linus Torvalds 已提交
2043 2044
}
#else
2045
#define handle_bridge(skb, pt_prev, ret, orig_dev)	(skb)
L
Linus Torvalds 已提交
2046 2047
#endif

P
Patrick McHardy 已提交
2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069
#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
2070 2071 2072 2073 2074
#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
2075
 * NOTE: This doesnt stop any functionality; if you dont have
L
Linus Torvalds 已提交
2076 2077 2078
 * the ingress scheduler, you just cant add policies on ingress.
 *
 */
2079
static int ing_filter(struct sk_buff *skb)
L
Linus Torvalds 已提交
2080 2081
{
	struct net_device *dev = skb->dev;
2082
	u32 ttl = G_TC_RTTL(skb->tc_verd);
2083 2084 2085
	struct netdev_queue *rxq;
	int result = TC_ACT_OK;
	struct Qdisc *q;
2086

2087 2088 2089 2090 2091 2092
	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
2093

2094 2095
	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
2096

2097 2098
	rxq = &dev->rx_queue;

2099
	q = rxq->qdisc;
2100
	if (q != &noop_qdisc) {
2101
		spin_lock(qdisc_lock(q));
2102 2103
		if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
			result = qdisc_enqueue_root(skb, q);
2104 2105
		spin_unlock(qdisc_lock(q));
	}
2106 2107 2108

	return result;
}
2109

2110 2111 2112 2113
static inline struct sk_buff *handle_ing(struct sk_buff *skb,
					 struct packet_type **pt_prev,
					 int *ret, struct net_device *orig_dev)
{
2114
	if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2115
		goto out;
L
Linus Torvalds 已提交
2116

2117 2118 2119 2120 2121 2122
	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
2123 2124
	}

2125 2126 2127 2128 2129 2130 2131 2132 2133 2134
	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
2135 2136 2137
}
#endif

2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164
/*
 * 	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();
}

2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179
/**
 *	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
2180 2181 2182
int netif_receive_skb(struct sk_buff *skb)
{
	struct packet_type *ptype, *pt_prev;
D
David S. Miller 已提交
2183
	struct net_device *orig_dev;
2184
	struct net_device *null_or_orig;
L
Linus Torvalds 已提交
2185
	int ret = NET_RX_DROP;
A
Al Viro 已提交
2186
	__be16 type;
L
Linus Torvalds 已提交
2187 2188

	/* if we've gotten here through NAPI, check netpoll */
2189
	if (netpoll_receive_skb(skb))
L
Linus Torvalds 已提交
2190 2191
		return NET_RX_DROP;

2192
	if (!skb->tstamp.tv64)
2193
		net_timestamp(skb);
L
Linus Torvalds 已提交
2194

2195 2196
	if (!skb->iif)
		skb->iif = skb->dev->ifindex;
2197

2198
	null_or_orig = NULL;
J
Joe Eykholt 已提交
2199 2200
	orig_dev = skb->dev;
	if (orig_dev->master) {
2201 2202 2203 2204
		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
2205
	}
2206

L
Linus Torvalds 已提交
2207 2208
	__get_cpu_var(netdev_rx_stat).total++;

2209
	skb_reset_network_header(skb);
2210
	skb_reset_transport_header(skb);
2211
	skb->mac_len = skb->network_header - skb->mac_header;
L
Linus Torvalds 已提交
2212 2213 2214 2215 2216

	pt_prev = NULL;

	rcu_read_lock();

2217 2218 2219 2220
	/* Don't receive packets in an exiting network namespace */
	if (!net_alive(dev_net(skb->dev)))
		goto out;

L
Linus Torvalds 已提交
2221 2222 2223 2224 2225 2226 2227 2228
#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) {
2229 2230
		if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
		    ptype->dev == orig_dev) {
2231
			if (pt_prev)
D
David S. Miller 已提交
2232
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2233 2234 2235 2236 2237
			pt_prev = ptype;
		}
	}

#ifdef CONFIG_NET_CLS_ACT
2238 2239
	skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
	if (!skb)
L
Linus Torvalds 已提交
2240 2241 2242 2243
		goto out;
ncls:
#endif

2244
	skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
P
Patrick McHardy 已提交
2245 2246 2247
	if (!skb)
		goto out;
	skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2248
	if (!skb)
L
Linus Torvalds 已提交
2249 2250 2251
		goto out;

	type = skb->protocol;
2252 2253
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
L
Linus Torvalds 已提交
2254
		if (ptype->type == type &&
2255 2256
		    (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
		     ptype->dev == orig_dev)) {
2257
			if (pt_prev)
D
David S. Miller 已提交
2258
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2259 2260 2261 2262 2263
			pt_prev = ptype;
		}
	}

	if (pt_prev) {
D
David S. Miller 已提交
2264
		ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277
	} 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;
}

2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291
/* 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);
		}
}

2292
static int process_backlog(struct napi_struct *napi, int quota)
L
Linus Torvalds 已提交
2293 2294 2295 2296 2297
{
	int work = 0;
	struct softnet_data *queue = &__get_cpu_var(softnet_data);
	unsigned long start_time = jiffies;

2298 2299
	napi->weight = weight_p;
	do {
L
Linus Torvalds 已提交
2300 2301 2302 2303
		struct sk_buff *skb;

		local_irq_disable();
		skb = __skb_dequeue(&queue->input_pkt_queue);
2304 2305 2306 2307 2308
		if (!skb) {
			__napi_complete(napi);
			local_irq_enable();
			break;
		}
L
Linus Torvalds 已提交
2309 2310 2311
		local_irq_enable();

		netif_receive_skb(skb);
2312
	} while (++work < quota && jiffies == start_time);
L
Linus Torvalds 已提交
2313

2314 2315
	return work;
}
L
Linus Torvalds 已提交
2316

2317 2318
/**
 * __napi_schedule - schedule for receive
2319
 * @n: entry to schedule
2320 2321 2322
 *
 * The entry's receive function will be scheduled to run
 */
H
Harvey Harrison 已提交
2323
void __napi_schedule(struct napi_struct *n)
2324 2325
{
	unsigned long flags;
L
Linus Torvalds 已提交
2326

2327 2328 2329 2330
	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
2331
}
2332 2333
EXPORT_SYMBOL(__napi_schedule);

L
Linus Torvalds 已提交
2334 2335 2336

static void net_rx_action(struct softirq_action *h)
{
2337
	struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
L
Linus Torvalds 已提交
2338
	unsigned long start_time = jiffies;
2339
	int budget = netdev_budget;
2340 2341
	void *have;

L
Linus Torvalds 已提交
2342 2343
	local_irq_disable();

2344 2345 2346
	while (!list_empty(list)) {
		struct napi_struct *n;
		int work, weight;
L
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2347

2348 2349 2350 2351 2352 2353 2354 2355
		/* If softirq window is exhuasted then punt.
		 *
		 * Note that this is a slight policy change from the
		 * previous NAPI code, which would allow up to 2
		 * jiffies to pass before breaking out.  The test
		 * used to be "jiffies - start_time > 1".
		 */
		if (unlikely(budget <= 0 || jiffies != start_time))
L
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2356 2357 2358 2359
			goto softnet_break;

		local_irq_enable();

2360 2361 2362 2363 2364 2365
		/* 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
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2366

2367 2368 2369 2370
		have = netpoll_poll_lock(n);

		weight = n->weight;

2371 2372 2373 2374 2375 2376 2377 2378 2379
		/* 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);
2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391

		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.
		 */
2392 2393 2394 2395 2396 2397
		if (unlikely(work == weight)) {
			if (unlikely(napi_disable_pending(n)))
				__napi_complete(n);
			else
				list_move_tail(&n->poll_list, list);
		}
2398 2399

		netpoll_poll_unlock(have);
L
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2400 2401
	}
out:
2402
	local_irq_enable();
2403

2404 2405 2406 2407 2408
#ifdef CONFIG_NET_DMA
	/*
	 * There may not be any more sk_buffs coming right now, so push
	 * any pending DMA copies to hardware
	 */
2409 2410
	if (!cpus_empty(net_dma.channel_mask)) {
		int chan_idx;
2411
		for_each_cpu_mask_nr(chan_idx, net_dma.channel_mask) {
2412 2413 2414 2415
			struct dma_chan *chan = net_dma.channels[chan_idx];
			if (chan)
				dma_async_memcpy_issue_pending(chan);
		}
2416 2417
	}
#endif
2418

L
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2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457
	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
 */

2458
static int dev_ifname(struct net *net, struct ifreq __user *arg)
L
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{
	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);
2471
	dev = __dev_get_by_index(net, ifr.ifr_ifindex);
L
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2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490
	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'.
 */

2491
static int dev_ifconf(struct net *net, char __user *arg)
L
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2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514
{
	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;
2515
	for_each_netdev(net, dev) {
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2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528
		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;
			}
		}
2529
	}
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2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546

	/*
	 *	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.
 */
2547
void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2548
	__acquires(dev_base_lock)
L
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2549
{
2550
	struct net *net = seq_file_net(seq);
2551
	loff_t off;
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2552 2553
	struct net_device *dev;

2554 2555 2556
	read_lock(&dev_base_lock);
	if (!*pos)
		return SEQ_START_TOKEN;
L
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2557

2558
	off = 1;
2559
	for_each_netdev(net, dev)
2560 2561
		if (off++ == *pos)
			return dev;
L
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2562

2563
	return NULL;
L
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2564 2565 2566 2567
}

void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
2568
	struct net *net = seq_file_net(seq);
L
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2569
	++*pos;
2570
	return v == SEQ_START_TOKEN ?
2571
		first_net_device(net) : next_net_device((struct net_device *)v);
L
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2572 2573 2574
}

void dev_seq_stop(struct seq_file *seq, void *v)
2575
	__releases(dev_base_lock)
L
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2576 2577 2578 2579 2580 2581
{
	read_unlock(&dev_base_lock);
}

static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
R
Rusty Russell 已提交
2582
	struct net_device_stats *stats = dev->get_stats(dev);
L
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2583

2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600
	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);
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2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623
}

/*
 *	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;

2624
	while (*pos < nr_cpu_ids)
2625
		if (cpu_online(*pos)) {
L
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2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652
			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",
2653
		   s->total, s->dropped, s->time_squeeze, 0,
2654 2655
		   0, 0, 0, 0, /* was fastroute */
		   s->cpu_collision );
L
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2656 2657 2658
	return 0;
}

2659
static const struct seq_operations dev_seq_ops = {
L
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2660 2661 2662 2663 2664 2665 2666 2667
	.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)
{
2668 2669
	return seq_open_net(inode, file, &dev_seq_ops,
			    sizeof(struct seq_net_private));
L
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2670 2671
}

2672
static const struct file_operations dev_seq_fops = {
L
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2673 2674 2675 2676
	.owner	 = THIS_MODULE,
	.open    = dev_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
2677
	.release = seq_release_net,
L
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2678 2679
};

2680
static const struct seq_operations softnet_seq_ops = {
L
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2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691
	.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);
}

2692
static const struct file_operations softnet_seq_fops = {
L
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2693 2694 2695 2696 2697 2698 2699
	.owner	 = THIS_MODULE,
	.open    = softnet_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release,
};

2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711
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;
	}

2712
	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
2713 2714 2715 2716 2717 2718 2719 2720 2721 2722
		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)
2723
	__acquires(RCU)
2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746
{
	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
2747
		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
2748 2749

	while (nxt == &ptype_base[hash]) {
2750
		if (++hash >= PTYPE_HASH_SIZE)
2751 2752 2753 2754 2755 2756 2757 2758
			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)
2759
	__releases(RCU)
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 2793 2794
{
	rcu_read_unlock();
}

static void ptype_seq_decode(struct seq_file *seq, void *sym)
{
#ifdef CONFIG_KALLSYMS
	unsigned long offset = 0, symsize;
	const char *symname;
	char *modname;
	char namebuf[128];

	symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset,
				  &modname, namebuf);

	if (symname) {
		char *delim = ":";

		if (!modname)
			modname = delim = "";
		seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim,
			   symname, offset);
		return;
	}
#endif

	seq_printf(seq, "[%p]", sym);
}

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");
2795
	else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818
		if (pt->type == htons(ETH_P_ALL))
			seq_puts(seq, "ALL ");
		else
			seq_printf(seq, "%04x", ntohs(pt->type));

		seq_printf(seq, " %-8s ",
			   pt->dev ? pt->dev->name : "");
		ptype_seq_decode(seq,  pt->func);
		seq_putc(seq, '\n');
	}

	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)
{
2819 2820
	return seq_open_net(inode, file, &ptype_seq_ops,
			sizeof(struct seq_net_private));
2821 2822 2823 2824 2825 2826 2827
}

static const struct file_operations ptype_seq_fops = {
	.owner	 = THIS_MODULE,
	.open    = ptype_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
2828
	.release = seq_release_net,
2829 2830 2831
};


2832
static int __net_init dev_proc_net_init(struct net *net)
L
Linus Torvalds 已提交
2833 2834 2835
{
	int rc = -ENOMEM;

2836
	if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
L
Linus Torvalds 已提交
2837
		goto out;
2838
	if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
L
Linus Torvalds 已提交
2839
		goto out_dev;
2840
	if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
2841
		goto out_softnet;
2842

2843
	if (wext_proc_init(net))
2844
		goto out_ptype;
L
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2845 2846 2847
	rc = 0;
out:
	return rc;
2848
out_ptype:
2849
	proc_net_remove(net, "ptype");
L
Linus Torvalds 已提交
2850
out_softnet:
2851
	proc_net_remove(net, "softnet_stat");
L
Linus Torvalds 已提交
2852
out_dev:
2853
	proc_net_remove(net, "dev");
L
Linus Torvalds 已提交
2854 2855
	goto out;
}
2856

2857
static void __net_exit dev_proc_net_exit(struct net *net)
2858 2859 2860 2861 2862 2863 2864 2865
{
	wext_proc_exit(net);

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

2866
static struct pernet_operations __net_initdata dev_proc_ops = {
2867 2868 2869 2870 2871 2872 2873 2874
	.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
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2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903
#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;
2904

L
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2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918
	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;
}

2919
static int __dev_set_promiscuity(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
2920 2921 2922
{
	unsigned short old_flags = dev->flags;

2923 2924
	ASSERT_RTNL();

2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941
	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;
		}
	}
2942
	if (dev->flags != old_flags) {
L
Linus Torvalds 已提交
2943 2944
		printk(KERN_INFO "device %s %s promiscuous mode\n",
		       dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2945
							       "left");
2946 2947 2948 2949 2950 2951 2952 2953 2954
		if (audit_enabled)
			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),
				current->uid, current->gid,
				audit_get_sessionid(current));
2955 2956 2957

		if (dev->change_rx_flags)
			dev->change_rx_flags(dev, IFF_PROMISC);
L
Linus Torvalds 已提交
2958
	}
2959
	return 0;
L
Linus Torvalds 已提交
2960 2961
}

2962 2963 2964 2965 2966 2967 2968 2969 2970
/**
 *	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.
2971
 *	Return 0 if successful or a negative errno code on error.
2972
 */
2973
int dev_set_promiscuity(struct net_device *dev, int inc)
2974 2975
{
	unsigned short old_flags = dev->flags;
2976
	int err;
2977

2978
	err = __dev_set_promiscuity(dev, inc);
2979
	if (err < 0)
2980
		return err;
2981 2982
	if (dev->flags != old_flags)
		dev_set_rx_mode(dev);
2983
	return err;
2984 2985
}

L
Linus Torvalds 已提交
2986 2987 2988 2989 2990 2991 2992 2993 2994 2995
/**
 *	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.
2996
 *	Return 0 if successful or a negative errno code on error.
L
Linus Torvalds 已提交
2997 2998
 */

2999
int dev_set_allmulti(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
3000 3001 3002
{
	unsigned short old_flags = dev->flags;

3003 3004
	ASSERT_RTNL();

L
Linus Torvalds 已提交
3005
	dev->flags |= IFF_ALLMULTI;
3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021
	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;
		}
	}
3022 3023 3024
	if (dev->flags ^ old_flags) {
		if (dev->change_rx_flags)
			dev->change_rx_flags(dev, IFF_ALLMULTI);
3025
		dev_set_rx_mode(dev);
3026
	}
3027
	return 0;
3028 3029 3030 3031 3032
}

/*
 *	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
3033
 *	filtering it is put in promiscuous mode while unicast addresses
3034 3035 3036 3037 3038 3039 3040 3041 3042
 *	are present.
 */
void __dev_set_rx_mode(struct net_device *dev)
{
	/* dev_open will call this function so the list will stay sane. */
	if (!(dev->flags&IFF_UP))
		return;

	if (!netif_device_present(dev))
3043
		return;
3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065

	if (dev->set_rx_mode)
		dev->set_rx_mode(dev);
	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;
		}

		if (dev->set_multicast_list)
			dev->set_multicast_list(dev);
	}
}

void dev_set_rx_mode(struct net_device *dev)
{
3066
	netif_addr_lock_bh(dev);
3067
	__dev_set_rx_mode(dev);
3068
	netif_addr_unlock_bh(dev);
L
Linus Torvalds 已提交
3069 3070
}

3071 3072
int __dev_addr_delete(struct dev_addr_list **list, int *count,
		      void *addr, int alen, int glbl)
3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089
{
	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);
3090
			(*count)--;
3091 3092 3093 3094 3095 3096
			return 0;
		}
	}
	return -ENOENT;
}

3097 3098
int __dev_addr_add(struct dev_addr_list **list, int *count,
		   void *addr, int alen, int glbl)
3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115
{
	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;
		}
	}

3116
	da = kzalloc(sizeof(*da), GFP_ATOMIC);
3117 3118 3119 3120 3121 3122 3123 3124
	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;
3125
	(*count)++;
3126 3127 3128
	return 0;
}

3129 3130 3131
/**
 *	dev_unicast_delete	- Release secondary unicast address.
 *	@dev: device
R
Randy Dunlap 已提交
3132 3133
 *	@addr: address to delete
 *	@alen: length of @addr
3134 3135
 *
 *	Release reference to a secondary unicast address and remove it
R
Randy Dunlap 已提交
3136
 *	from the device if the reference count drops to zero.
3137 3138 3139 3140 3141 3142 3143 3144 3145
 *
 * 	The caller must hold the rtnl_mutex.
 */
int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
{
	int err;

	ASSERT_RTNL();

3146
	netif_addr_lock_bh(dev);
3147 3148
	err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
	if (!err)
3149
		__dev_set_rx_mode(dev);
3150
	netif_addr_unlock_bh(dev);
3151 3152 3153 3154 3155 3156 3157
	return err;
}
EXPORT_SYMBOL(dev_unicast_delete);

/**
 *	dev_unicast_add		- add a secondary unicast address
 *	@dev: device
3158
 *	@addr: address to add
R
Randy Dunlap 已提交
3159
 *	@alen: length of @addr
3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171
 *
 *	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();

3172
	netif_addr_lock_bh(dev);
3173 3174
	err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
	if (!err)
3175
		__dev_set_rx_mode(dev);
3176
	netif_addr_unlock_bh(dev);
3177 3178 3179 3180
	return err;
}
EXPORT_SYMBOL(dev_unicast_add);

3181 3182 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 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242
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;

3243
	netif_addr_lock_bh(to);
3244 3245 3246 3247
	err = __dev_addr_sync(&to->uc_list, &to->uc_count,
			      &from->uc_list, &from->uc_count);
	if (!err)
		__dev_set_rx_mode(to);
3248
	netif_addr_unlock_bh(to);
3249 3250 3251 3252 3253
	return err;
}
EXPORT_SYMBOL(dev_unicast_sync);

/**
3254
 *	dev_unicast_unsync - Remove synchronized addresses from the destination device
3255 3256 3257 3258 3259 3260 3261 3262 3263
 *	@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)
{
3264
	netif_addr_lock_bh(from);
3265
	netif_addr_lock(to);
3266 3267 3268 3269 3270

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

3271
	netif_addr_unlock(to);
3272
	netif_addr_unlock_bh(from);
3273 3274 3275
}
EXPORT_SYMBOL(dev_unicast_unsync);

3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289
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);
	}
}

3290
static void dev_addr_discard(struct net_device *dev)
3291
{
3292
	netif_addr_lock_bh(dev);
3293

3294 3295 3296
	__dev_addr_discard(&dev->uc_list);
	dev->uc_count = 0;

3297 3298
	__dev_addr_discard(&dev->mc_list);
	dev->mc_count = 0;
3299

3300
	netif_addr_unlock_bh(dev);
3301 3302
}

L
Linus Torvalds 已提交
3303 3304 3305 3306 3307 3308
unsigned dev_get_flags(const struct net_device *dev)
{
	unsigned flags;

	flags = (dev->flags & ~(IFF_PROMISC |
				IFF_ALLMULTI |
S
Stefan Rompf 已提交
3309 3310 3311
				IFF_RUNNING |
				IFF_LOWER_UP |
				IFF_DORMANT)) |
L
Linus Torvalds 已提交
3312 3313 3314
		(dev->gflags & (IFF_PROMISC |
				IFF_ALLMULTI));

S
Stefan Rompf 已提交
3315 3316 3317 3318 3319 3320 3321 3322
	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
Linus Torvalds 已提交
3323 3324 3325 3326 3327 3328

	return flags;
}

int dev_change_flags(struct net_device *dev, unsigned flags)
{
3329
	int ret, changes;
L
Linus Torvalds 已提交
3330 3331
	int old_flags = dev->flags;

3332 3333
	ASSERT_RTNL();

L
Linus Torvalds 已提交
3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347
	/*
	 *	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.
	 */

3348
	if (dev->change_rx_flags && (old_flags ^ flags) & IFF_MULTICAST)
3349 3350
		dev->change_rx_flags(dev, IFF_MULTICAST);

3351
	dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363

	/*
	 *	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)
3364
			dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
3365 3366 3367 3368 3369
	}

	if (dev->flags & IFF_UP &&
	    ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
					  IFF_VOLATILE)))
3370
		call_netdevice_notifiers(NETDEV_CHANGE, dev);
L
Linus Torvalds 已提交
3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387

	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);
	}

3388 3389 3390 3391
	/* Exclude state transition flags, already notified */
	changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
	if (changes)
		rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
L
Linus Torvalds 已提交
3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415

	return ret;
}

int dev_set_mtu(struct net_device *dev, int new_mtu)
{
	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;
	if (dev->change_mtu)
		err = dev->change_mtu(dev, new_mtu);
	else
		dev->mtu = new_mtu;
	if (!err && dev->flags & IFF_UP)
3416
		call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
L
Linus Torvalds 已提交
3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431
	return err;
}

int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
{
	int err;

	if (!dev->set_mac_address)
		return -EOPNOTSUPP;
	if (sa->sa_family != dev->type)
		return -EINVAL;
	if (!netif_device_present(dev))
		return -ENODEV;
	err = dev->set_mac_address(dev, sa);
	if (!err)
3432
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
L
Linus Torvalds 已提交
3433 3434 3435 3436
	return err;
}

/*
3437
 *	Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
L
Linus Torvalds 已提交
3438
 */
3439
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
L
Linus Torvalds 已提交
3440 3441
{
	int err;
3442
	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
L
Linus Torvalds 已提交
3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469

	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;

3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524
		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);

	if (!dev)
		return -ENODEV;

	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
3525 3526 3527 3528 3529 3530 3531 3532
		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));
3533
			call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
L
Linus Torvalds 已提交
3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544
			return 0;

		case SIOCSIFMAP:
			if (dev->set_config) {
				if (!netif_device_present(dev))
					return -ENODEV;
				return dev->set_config(dev, &ifr->ifr_map);
			}
			return -EOPNOTSUPP;

		case SIOCADDMULTI:
3545
			if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
L
Linus Torvalds 已提交
3546 3547 3548 3549 3550 3551 3552 3553
			    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:
3554
			if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
L
Linus Torvalds 已提交
3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612
			    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;
				if (dev->do_ioctl) {
					if (netif_device_present(dev))
						err = dev->do_ioctl(dev, ifr,
								    cmd);
					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
3613
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
3614 3615 3616 3617 3618 3619 3620 3621 3622
 *	@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.
 */

3623
int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
L
Linus Torvalds 已提交
3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634
{
	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) {
3635
		rtnl_lock();
3636
		ret = dev_ifconf(net, (char __user *) arg);
3637
		rtnl_unlock();
L
Linus Torvalds 已提交
3638 3639 3640
		return ret;
	}
	if (cmd == SIOCGIFNAME)
3641
		return dev_ifname(net, (struct ifreq __user *)arg);
L
Linus Torvalds 已提交
3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670

	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:
3671
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
3672
			read_lock(&dev_base_lock);
3673
			ret = dev_ifsioc_locked(net, &ifr, cmd);
L
Linus Torvalds 已提交
3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684
			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:
3685
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
3686
			rtnl_lock();
3687
			ret = dev_ethtool(net, &ifr);
L
Linus Torvalds 已提交
3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708
			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;
3709
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
3710
			rtnl_lock();
3711
			ret = dev_ifsioc(net, &ifr, cmd);
L
Linus Torvalds 已提交
3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746
			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;
3747 3748 3749
			/* fall through */
		case SIOCBONDSLAVEINFOQUERY:
		case SIOCBONDINFOQUERY:
3750
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
3751
			rtnl_lock();
3752
			ret = dev_ifsioc(net, &ifr, cmd);
L
Linus Torvalds 已提交
3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771
			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)) {
3772
				dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
3773
				rtnl_lock();
3774
				ret = dev_ifsioc(net, &ifr, cmd);
L
Linus Torvalds 已提交
3775 3776 3777 3778 3779 3780 3781
				rtnl_unlock();
				if (!ret && copy_to_user(arg, &ifr,
							 sizeof(struct ifreq)))
					ret = -EFAULT;
				return ret;
			}
			/* Take care of Wireless Extensions */
3782
			if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
3783
				return wext_handle_ioctl(net, &ifr, cmd, arg);
L
Linus Torvalds 已提交
3784 3785 3786 3787 3788 3789 3790
			return -EINVAL;
	}
}


/**
 *	dev_new_index	-	allocate an ifindex
3791
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
3792 3793 3794 3795 3796
 *
 *	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.
 */
3797
static int dev_new_index(struct net *net)
L
Linus Torvalds 已提交
3798 3799 3800 3801 3802
{
	static int ifindex;
	for (;;) {
		if (++ifindex <= 0)
			ifindex = 1;
3803
		if (!__dev_get_by_index(net, ifindex))
L
Linus Torvalds 已提交
3804 3805 3806 3807 3808 3809
			return ifindex;
	}
}

/* Delayed registration/unregisteration */
static DEFINE_SPINLOCK(net_todo_list_lock);
3810
static LIST_HEAD(net_todo_list);
L
Linus Torvalds 已提交
3811

3812
static void net_set_todo(struct net_device *dev)
L
Linus Torvalds 已提交
3813 3814 3815 3816 3817 3818
{
	spin_lock(&net_todo_list_lock);
	list_add_tail(&dev->todo_list, &net_todo_list);
	spin_unlock(&net_todo_list_lock);
}

3819 3820 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 3861 3862
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);

	if (dev->uninit)
		dev->uninit(dev);

	/* Notifier chain MUST detach us from master device. */
3863
	WARN_ON(dev->master);
3864 3865 3866 3867 3868 3869 3870 3871 3872

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

	synchronize_net();

	dev_put(dev);
}

3873 3874 3875
static void __netdev_init_queue_locks_one(struct net_device *dev,
					  struct netdev_queue *dev_queue,
					  void *_unused)
3876 3877
{
	spin_lock_init(&dev_queue->_xmit_lock);
3878
	netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
3879 3880 3881 3882 3883
	dev_queue->xmit_lock_owner = -1;
}

static void netdev_init_queue_locks(struct net_device *dev)
{
3884 3885
	netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
	__netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
3886 3887
}

L
Linus Torvalds 已提交
3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909
/**
 *	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;
3910
	struct net *net;
L
Linus Torvalds 已提交
3911 3912 3913 3914

	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

3915 3916
	might_sleep();

L
Linus Torvalds 已提交
3917 3918
	/* When net_device's are persistent, this will be fatal. */
	BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
3919 3920
	BUG_ON(!dev_net(dev));
	net = dev_net(dev);
L
Linus Torvalds 已提交
3921

3922
	spin_lock_init(&dev->addr_list_lock);
3923
	netdev_set_addr_lockdep_class(dev);
3924
	netdev_init_queue_locks(dev);
L
Linus Torvalds 已提交
3925 3926 3927 3928 3929 3930 3931 3932 3933

	dev->iflink = -1;

	/* Init, if this function is available */
	if (dev->init) {
		ret = dev->init(dev);
		if (ret) {
			if (ret > 0)
				ret = -EIO;
3934
			goto out;
L
Linus Torvalds 已提交
3935 3936
		}
	}
3937

L
Linus Torvalds 已提交
3938 3939
	if (!dev_valid_name(dev->name)) {
		ret = -EINVAL;
3940
		goto err_uninit;
L
Linus Torvalds 已提交
3941 3942
	}

3943
	dev->ifindex = dev_new_index(net);
L
Linus Torvalds 已提交
3944 3945 3946 3947
	if (dev->iflink == -1)
		dev->iflink = dev->ifindex;

	/* Check for existence of name */
3948
	head = dev_name_hash(net, dev->name);
L
Linus Torvalds 已提交
3949 3950 3951 3952 3953
	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;
3954
			goto err_uninit;
L
Linus Torvalds 已提交
3955
		}
3956
	}
L
Linus Torvalds 已提交
3957

3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973
	/* 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);
	}


L
Linus Torvalds 已提交
3974 3975
	/* Fix illegal SG+CSUM combinations. */
	if ((dev->features & NETIF_F_SG) &&
3976
	    !(dev->features & NETIF_F_ALL_CSUM)) {
3977
		printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
L
Linus Torvalds 已提交
3978 3979 3980 3981 3982 3983 3984
		       dev->name);
		dev->features &= ~NETIF_F_SG;
	}

	/* TSO requires that SG is present as well. */
	if ((dev->features & NETIF_F_TSO) &&
	    !(dev->features & NETIF_F_SG)) {
3985
		printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
L
Linus Torvalds 已提交
3986 3987 3988
		       dev->name);
		dev->features &= ~NETIF_F_TSO;
	}
3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002
	if (dev->features & NETIF_F_UFO) {
		if (!(dev->features & NETIF_F_HW_CSUM)) {
			printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
					"NETIF_F_HW_CSUM feature.\n",
							dev->name);
			dev->features &= ~NETIF_F_UFO;
		}
		if (!(dev->features & NETIF_F_SG)) {
			printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
					"NETIF_F_SG feature.\n",
					dev->name);
			dev->features &= ~NETIF_F_UFO;
		}
	}
L
Linus Torvalds 已提交
4003

4004 4005 4006 4007
	/* Enable software GSO if SG is supported. */
	if (dev->features & NETIF_F_SG)
		dev->features |= NETIF_F_GSO;

4008
	netdev_initialize_kobject(dev);
4009
	ret = netdev_register_kobject(dev);
4010
	if (ret)
4011
		goto err_uninit;
4012 4013
	dev->reg_state = NETREG_REGISTERED;

L
Linus Torvalds 已提交
4014 4015 4016 4017 4018 4019 4020 4021 4022
	/*
	 *	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);
4023
	list_netdevice(dev);
L
Linus Torvalds 已提交
4024 4025

	/* Notify protocols, that a new device appeared. */
4026
	ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4027
	ret = notifier_to_errno(ret);
4028 4029 4030 4031
	if (ret) {
		rollback_registered(dev);
		dev->reg_state = NETREG_UNREGISTERED;
	}
L
Linus Torvalds 已提交
4032 4033 4034

out:
	return ret;
4035 4036 4037 4038 4039

err_uninit:
	if (dev->uninit)
		dev->uninit(dev);
	goto out;
L
Linus Torvalds 已提交
4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050
}

/**
 *	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.
 *
4051
 *	This is a wrapper around register_netdevice that takes the rtnl semaphore
L
Linus Torvalds 已提交
4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069
 *	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;
	}
4070

L
Linus Torvalds 已提交
4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086
	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
4087
 * call dev_put.
L
Linus Torvalds 已提交
4088 4089 4090 4091 4092 4093 4094 4095
 */
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)) {
4096
			rtnl_lock();
L
Linus Torvalds 已提交
4097 4098

			/* Rebroadcast unregister notification */
4099
			call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
L
Linus Torvalds 已提交
4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111

			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();
			}

4112
			__rtnl_unlock();
L
Linus Torvalds 已提交
4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144

			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);
 *
 * We are invoked by rtnl_unlock() after it drops the semaphore.
 * This allows us to deal with problems:
4145
 * 1) We can delete sysfs objects which invoke hotplug
L
Linus Torvalds 已提交
4146 4147 4148 4149
 *    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.
 */
A
Arjan van de Ven 已提交
4150
static DEFINE_MUTEX(net_todo_run_mutex);
L
Linus Torvalds 已提交
4151 4152
void netdev_run_todo(void)
{
4153
	struct list_head list;
L
Linus Torvalds 已提交
4154 4155

	/* Need to guard against multiple cpu's getting out of order. */
A
Arjan van de Ven 已提交
4156
	mutex_lock(&net_todo_run_mutex);
L
Linus Torvalds 已提交
4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167

	/* Not safe to do outside the semaphore.  We must not return
	 * until all unregister events invoked by the local processor
	 * have been completed (either by this todo run, or one on
	 * another cpu).
	 */
	if (list_empty(&net_todo_list))
		goto out;

	/* Snapshot list, allow later requests */
	spin_lock(&net_todo_list_lock);
4168
	list_replace_init(&net_todo_list, &list);
L
Linus Torvalds 已提交
4169
	spin_unlock(&net_todo_list_lock);
4170

L
Linus Torvalds 已提交
4171 4172 4173 4174 4175
	while (!list_empty(&list)) {
		struct net_device *dev
			= list_entry(list.next, struct net_device, todo_list);
		list_del(&dev->todo_list);

4176 4177 4178 4179 4180 4181
		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
4182

4183
		dev->reg_state = NETREG_UNREGISTERED;
L
Linus Torvalds 已提交
4184

4185 4186
		on_each_cpu(flush_backlog, dev, 1);

4187
		netdev_wait_allrefs(dev);
L
Linus Torvalds 已提交
4188

4189 4190
		/* paranoia */
		BUG_ON(atomic_read(&dev->refcnt));
4191 4192 4193
		WARN_ON(dev->ip_ptr);
		WARN_ON(dev->ip6_ptr);
		WARN_ON(dev->dn_ptr);
L
Linus Torvalds 已提交
4194

4195 4196
		if (dev->destructor)
			dev->destructor(dev);
4197 4198 4199

		/* Free network device */
		kobject_put(&dev->dev.kobj);
L
Linus Torvalds 已提交
4200 4201 4202
	}

out:
A
Arjan van de Ven 已提交
4203
	mutex_unlock(&net_todo_run_mutex);
L
Linus Torvalds 已提交
4204 4205
}

4206
static struct net_device_stats *internal_stats(struct net_device *dev)
R
Rusty Russell 已提交
4207
{
4208
	return &dev->stats;
R
Rusty Russell 已提交
4209 4210
}

4211
static void netdev_init_one_queue(struct net_device *dev,
4212 4213
				  struct netdev_queue *queue,
				  void *_unused)
4214 4215 4216 4217
{
	queue->dev = dev;
}

4218 4219
static void netdev_init_queues(struct net_device *dev)
{
4220 4221
	netdev_init_one_queue(dev, &dev->rx_queue, NULL);
	netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
4222
	spin_lock_init(&dev->tx_global_lock);
4223 4224
}

L
Linus Torvalds 已提交
4225
/**
4226
 *	alloc_netdev_mq - allocate network device
L
Linus Torvalds 已提交
4227 4228 4229
 *	@sizeof_priv:	size of private data to allocate space for
 *	@name:		device name format string
 *	@setup:		callback to initialize device
4230
 *	@queue_count:	the number of subqueues to allocate
L
Linus Torvalds 已提交
4231 4232
 *
 *	Allocates a struct net_device with private data area for driver use
4233 4234
 *	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
4235
 */
4236 4237
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
4238
{
4239
	struct netdev_queue *tx;
L
Linus Torvalds 已提交
4240
	struct net_device *dev;
4241
	size_t alloc_size;
4242
	void *p;
L
Linus Torvalds 已提交
4243

4244 4245
	BUG_ON(strlen(name) >= sizeof(dev->name));

4246
	alloc_size = sizeof(struct net_device);
4247 4248 4249 4250 4251 4252 4253
	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
4254

4255
	p = kzalloc(alloc_size, GFP_KERNEL);
L
Linus Torvalds 已提交
4256
	if (!p) {
4257
		printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
L
Linus Torvalds 已提交
4258 4259 4260
		return NULL;
	}

4261
	tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
4262 4263 4264 4265 4266 4267 4268
	if (!tx) {
		printk(KERN_ERR "alloc_netdev: Unable to allocate "
		       "tx qdiscs.\n");
		kfree(p);
		return NULL;
	}

L
Linus Torvalds 已提交
4269 4270 4271
	dev = (struct net_device *)
		(((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
	dev->padded = (char *)dev - (char *)p;
4272
	dev_net_set(dev, &init_net);
L
Linus Torvalds 已提交
4273

4274 4275
	dev->_tx = tx;
	dev->num_tx_queues = queue_count;
4276
	dev->real_num_tx_queues = queue_count;
4277

4278 4279
	if (sizeof_priv) {
		dev->priv = ((char *)dev +
4280
			     ((sizeof(struct net_device) + NETDEV_ALIGN_CONST)
4281 4282 4283
			      & ~NETDEV_ALIGN_CONST));
	}

4284
	dev->gso_max_size = GSO_MAX_SIZE;
L
Linus Torvalds 已提交
4285

4286 4287
	netdev_init_queues(dev);

4288
	dev->get_stats = internal_stats;
4289
	netpoll_netdev_init(dev);
L
Linus Torvalds 已提交
4290 4291 4292 4293
	setup(dev);
	strcpy(dev->name, name);
	return dev;
}
4294
EXPORT_SYMBOL(alloc_netdev_mq);
L
Linus Torvalds 已提交
4295 4296 4297 4298 4299

/**
 *	free_netdev - free network device
 *	@dev: device
 *
4300 4301
 *	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
4302 4303 4304 4305
 *	If this is the last reference then it will be freed.
 */
void free_netdev(struct net_device *dev)
{
4306 4307
	release_net(dev_net(dev));

4308 4309
	kfree(dev->_tx);

S
Stephen Hemminger 已提交
4310
	/*  Compatibility with error handling in drivers */
L
Linus Torvalds 已提交
4311 4312 4313 4314 4315 4316 4317 4318
	if (dev->reg_state == NETREG_UNINITIALIZED) {
		kfree((char *)dev - dev->padded);
		return;
	}

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

4319 4320
	/* will free via device release */
	put_device(&dev->dev);
L
Linus Torvalds 已提交
4321
}
4322

L
Linus Torvalds 已提交
4323
/* Synchronize with packet receive processing. */
4324
void synchronize_net(void)
L
Linus Torvalds 已提交
4325 4326
{
	might_sleep();
4327
	synchronize_rcu();
L
Linus Torvalds 已提交
4328 4329 4330 4331 4332 4333 4334
}

/**
 *	unregister_netdevice - remove device from the kernel
 *	@dev: device
 *
 *	This function shuts down a device interface and removes it
4335
 *	from the kernel tables.
L
Linus Torvalds 已提交
4336 4337 4338 4339 4340
 *
 *	Callers must hold the rtnl semaphore.  You may want
 *	unregister_netdev() instead of this.
 */

4341
void unregister_netdevice(struct net_device *dev)
L
Linus Torvalds 已提交
4342
{
4343 4344
	ASSERT_RTNL();

4345
	rollback_registered(dev);
L
Linus Torvalds 已提交
4346 4347 4348 4349 4350 4351 4352 4353 4354
	/* 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
4355
 *	from the kernel tables.
L
Linus Torvalds 已提交
4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369
 *
 *	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);

4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403
/**
 *	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;

	/* 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;
4404
	if (net_eq(dev_net(dev), net))
4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432
		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. */
4433
	dev_close(dev);
4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454

	/* 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);

	/* Actually switch the network namespace */
4455
	dev_net_set(dev, net);
4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468

	/* 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;
	}

4469
	/* Fixup kobjects */
4470 4471
	netdev_unregister_kobject(dev);
	err = netdev_register_kobject(dev);
4472
	WARN_ON(err);
4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485

	/* 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
4486 4487 4488 4489 4490
static int dev_cpu_callback(struct notifier_block *nfb,
			    unsigned long action,
			    void *ocpu)
{
	struct sk_buff **list_skb;
4491
	struct Qdisc **list_net;
L
Linus Torvalds 已提交
4492 4493 4494 4495
	struct sk_buff *skb;
	unsigned int cpu, oldcpu = (unsigned long)ocpu;
	struct softnet_data *sd, *oldsd;

4496
	if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
L
Linus Torvalds 已提交
4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527 4528 4529
		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;
}

4530 4531
#ifdef CONFIG_NET_DMA
/**
R
Randy Dunlap 已提交
4532 4533 4534 4535 4536
 * net_dma_rebalance - try to maintain one DMA channel per CPU
 * @net_dma: DMA client and associated data (lock, channels, channel_mask)
 *
 * This is called when the number of channels allocated to the net_dma client
 * changes.  The net_dma client tries to have one DMA channel per CPU.
4537
 */
4538 4539

static void net_dma_rebalance(struct net_dma *net_dma)
4540
{
4541
	unsigned int cpu, i, n, chan_idx;
4542 4543
	struct dma_chan *chan;

4544
	if (cpus_empty(net_dma->channel_mask)) {
4545
		for_each_online_cpu(cpu)
A
Alexey Dobriyan 已提交
4546
			rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
4547 4548 4549 4550 4551 4552
		return;
	}

	i = 0;
	cpu = first_cpu(cpu_online_map);

4553
	for_each_cpu_mask_nr(chan_idx, net_dma->channel_mask) {
4554 4555 4556 4557 4558
		chan = net_dma->channels[chan_idx];

		n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask))
		   + (i < (num_online_cpus() %
			cpus_weight(net_dma->channel_mask)) ? 1 : 0));
4559 4560

		while(n) {
A
Alexey Dobriyan 已提交
4561
			per_cpu(softnet_data, cpu).net_dma = chan;
4562 4563 4564 4565 4566 4567 4568 4569 4570 4571
			cpu = next_cpu(cpu, cpu_online_map);
			n--;
		}
		i++;
	}
}

/**
 * netdev_dma_event - event callback for the net_dma_client
 * @client: should always be net_dma_client
R
Randy Dunlap 已提交
4572
 * @chan: DMA channel for the event
R
Randy Dunlap 已提交
4573
 * @state: DMA state to be handled
4574
 */
4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586
static enum dma_state_client
netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
	enum dma_state state)
{
	int i, found = 0, pos = -1;
	struct net_dma *net_dma =
		container_of(client, struct net_dma, client);
	enum dma_state_client ack = DMA_DUP; /* default: take no action */

	spin_lock(&net_dma->lock);
	switch (state) {
	case DMA_RESOURCE_AVAILABLE:
4587
		for (i = 0; i < nr_cpu_ids; i++)
4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599
			if (net_dma->channels[i] == chan) {
				found = 1;
				break;
			} else if (net_dma->channels[i] == NULL && pos < 0)
				pos = i;

		if (!found && pos >= 0) {
			ack = DMA_ACK;
			net_dma->channels[pos] = chan;
			cpu_set(pos, net_dma->channel_mask);
			net_dma_rebalance(net_dma);
		}
4600 4601
		break;
	case DMA_RESOURCE_REMOVED:
4602
		for (i = 0; i < nr_cpu_ids; i++)
4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614
			if (net_dma->channels[i] == chan) {
				found = 1;
				pos = i;
				break;
			}

		if (found) {
			ack = DMA_ACK;
			cpu_clear(pos, net_dma->channel_mask);
			net_dma->channels[i] = NULL;
			net_dma_rebalance(net_dma);
		}
4615 4616 4617 4618
		break;
	default:
		break;
	}
4619 4620 4621
	spin_unlock(&net_dma->lock);

	return ack;
4622 4623 4624 4625 4626 4627 4628
}

/**
 * netdev_dma_regiser - register the networking subsystem as a DMA client
 */
static int __init netdev_dma_register(void)
{
4629 4630 4631 4632 4633 4634 4635
	net_dma.channels = kzalloc(nr_cpu_ids * sizeof(struct net_dma),
								GFP_KERNEL);
	if (unlikely(!net_dma.channels)) {
		printk(KERN_NOTICE
				"netdev_dma: no memory for net_dma.channels\n");
		return -ENOMEM;
	}
4636 4637 4638 4639
	spin_lock_init(&net_dma.lock);
	dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask);
	dma_async_client_register(&net_dma.client);
	dma_async_client_chan_request(&net_dma.client);
4640 4641 4642 4643 4644 4645
	return 0;
}

#else
static int __init netdev_dma_register(void) { return -ENODEV; }
#endif /* CONFIG_NET_DMA */
L
Linus Torvalds 已提交
4646

4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685
/**
 *	netdev_compute_feature - compute conjunction of two feature sets
 *	@all: first feature set
 *	@one: second feature set
 *
 *	Computes a new feature set after adding a device with feature set
 *	@one to the master device with current feature set @all.  Returns
 *	the new feature set.
 */
int netdev_compute_features(unsigned long all, unsigned long one)
{
	/* if device needs checksumming, downgrade to hw checksumming */
	if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
		all ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;

	/* if device can't do all checksum, downgrade to ipv4/ipv6 */
	if (all & NETIF_F_HW_CSUM && !(one & NETIF_F_HW_CSUM))
		all ^= NETIF_F_HW_CSUM
			| NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;

	if (one & NETIF_F_GSO)
		one |= NETIF_F_GSO_SOFTWARE;
	one |= NETIF_F_GSO;

	/* If even one device supports robust GSO, enable it for all. */
	if (one & NETIF_F_GSO_ROBUST)
		all |= NETIF_F_GSO_ROBUST;

	all &= one | NETIF_F_LLTX;

	if (!(all & NETIF_F_ALL_CSUM))
		all &= ~NETIF_F_SG;
	if (!(all & NETIF_F_SG))
		all &= ~NETIF_F_GSO_MASK;

	return all;
}
EXPORT_SYMBOL(netdev_compute_features);

4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698
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;
}

4699
/* Initialize per network namespace state */
4700
static int __net_init netdev_init(struct net *net)
4701 4702 4703
{
	INIT_LIST_HEAD(&net->dev_base_head);

4704 4705 4706
	net->dev_name_head = netdev_create_hash();
	if (net->dev_name_head == NULL)
		goto err_name;
4707

4708 4709 4710
	net->dev_index_head = netdev_create_hash();
	if (net->dev_index_head == NULL)
		goto err_idx;
4711 4712

	return 0;
4713 4714 4715 4716 4717

err_idx:
	kfree(net->dev_name_head);
err_name:
	return -ENOMEM;
4718 4719
}

4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739
char *netdev_drivername(struct net_device *dev, char *buffer, int len)
{
	struct device_driver *driver;
	struct device *parent;

	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;
}

4740
static void __net_exit netdev_exit(struct net *net)
4741 4742 4743 4744 4745
{
	kfree(net->dev_name_head);
	kfree(net->dev_index_head);
}

4746
static struct pernet_operations __net_initdata netdev_net_ops = {
4747 4748 4749 4750
	.init = netdev_init,
	.exit = netdev_exit,
};

4751
static void __net_exit default_device_exit(struct net *net)
4752 4753 4754 4755 4756 4757 4758 4759 4760
{
	struct net_device *dev, *next;
	/*
	 * Push all migratable of the network devices back to the
	 * initial network namespace
	 */
	rtnl_lock();
	for_each_netdev_safe(net, dev, next) {
		int err;
4761
		char fb_name[IFNAMSIZ];
4762 4763 4764 4765 4766 4767

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

		/* Push remaing network devices to init_net */
4768 4769
		snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
		err = dev_change_net_namespace(dev, &init_net, fb_name);
4770
		if (err) {
4771
			printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
4772
				__func__, dev->name, err);
4773
			BUG();
4774 4775 4776 4777 4778
		}
	}
	rtnl_unlock();
}

4779
static struct pernet_operations __net_initdata default_device_ops = {
4780 4781 4782
	.exit = default_device_exit,
};

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/*
 *	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;

4803
	if (netdev_kobject_init())
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Linus Torvalds 已提交
4804 4805 4806
		goto out;

	INIT_LIST_HEAD(&ptype_all);
4807
	for (i = 0; i < PTYPE_HASH_SIZE; i++)
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4808 4809
		INIT_LIST_HEAD(&ptype_base[i]);

4810 4811
	if (register_pernet_subsys(&netdev_net_ops))
		goto out;
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4812

4813 4814 4815
	if (register_pernet_device(&default_device_ops))
		goto out;

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4816 4817 4818 4819
	/*
	 *	Initialise the packet receive queues.
	 */

4820
	for_each_possible_cpu(i) {
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4821 4822 4823 4824 4825 4826
		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);
4827 4828 4829

		queue->backlog.poll = process_backlog;
		queue->backlog.weight = weight_p;
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4830 4831
	}

4832 4833
	netdev_dma_register();

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4834 4835
	dev_boot_phase = 0;

4836 4837
	open_softirq(NET_TX_SOFTIRQ, net_tx_action);
	open_softirq(NET_RX_SOFTIRQ, net_rx_action);
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4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851

	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);
4852
EXPORT_SYMBOL(dev_valid_name);
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Linus Torvalds 已提交
4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894
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

#ifdef CONFIG_KMOD
EXPORT_SYMBOL(dev_load);
#endif

EXPORT_PER_CPU_SYMBOL(softnet_data);