dev.c 142.8 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>
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#include <linux/hash.h>
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#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>
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#include <net/xfrm.h>
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#include <linux/highmem.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/module.h>
#include <linux/netpoll.h>
#include <linux/rcupdate.h>
#include <linux/delay.h>
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#include <net/wext.h>
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#include <net/iw_handler.h>
#include <asm/current.h>
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#include <linux/audit.h>
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#include <linux/dmaengine.h>
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#include <linux/err.h>
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#include <linux/ctype.h>
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#include <linux/if_arp.h>
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#include <linux/if_vlan.h>
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#include <linux/ip.h>
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#include <net/ip.h>
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#include <linux/ipv6.h>
#include <linux/in.h>
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#include <linux/jhash.h>
#include <linux/random.h>
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#include <trace/events/napi.h>
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#include "net-sysfs.h"

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

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

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

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

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static DEFINE_SPINLOCK(ptype_lock);
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static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
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static struct list_head ptype_all __read_mostly;	/* Taps */
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/*
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 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
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 * semaphore.
 *
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 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
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 *
 * 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);

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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_32(hash, NETDEV_HASHBITS)];
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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 & (NETDEV_HASHENTRIES - 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);
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	list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
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	hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
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	hlist_add_head_rcu(&dev->index_hlist,
			   dev_index_hash(net, dev->ifindex));
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	write_unlock_bh(&dev_base_lock);
	return 0;
}

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/* Device list removal
 * caller must respect a RCU grace period before freeing/reusing dev
 */
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static void unlist_netdevice(struct net_device *dev)
{
	ASSERT_RTNL();

	/* Unlink dev from the device chain */
	write_lock_bh(&dev_base_lock);
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	list_del_rcu(&dev->dev_list);
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	hlist_del_rcu(&dev->name_hlist);
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	hlist_del_rcu(&dev->index_hlist);
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	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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EXPORT_PER_CPU_SYMBOL(softnet_data);
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#ifdef CONFIG_LOCKDEP
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/*
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 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
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 * according to dev->type
 */
static const unsigned short netdev_lock_type[] =
	{ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
	 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
	 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
	 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
	 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
	 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
	 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
	 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
	 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
	 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
	 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
	 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
	 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
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	 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
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	 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
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	 ARPHRD_VOID, ARPHRD_NONE};
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static const char *const netdev_lock_name[] =
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	{"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
	 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
	 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
	 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
	 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
	 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
	 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
	 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
	 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
	 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
	 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
	 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
	 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
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	 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
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	 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
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	 "_xmit_VOID", "_xmit_NONE"};
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static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
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static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
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static inline unsigned short netdev_lock_pos(unsigned short dev_type)
{
	int i;

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

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

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

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

		Protocol management and registration routines

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

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

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

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

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

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/**
 *	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();
}
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EXPORT_SYMBOL(dev_remove_pack);
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/******************************************************************************

		      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;
}
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EXPORT_SYMBOL(netdev_boot_setup_check);
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/**
 *	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
	 */
533
	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
579
 *	@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.
 */

589
struct net_device *__dev_get_by_name(struct net *net, const char *name)
L
Linus Torvalds 已提交
590 591
{
	struct hlist_node *p;
E
Eric Dumazet 已提交
592 593
	struct net_device *dev;
	struct hlist_head *head = dev_name_hash(net, name);
L
Linus Torvalds 已提交
594

E
Eric Dumazet 已提交
595
	hlist_for_each_entry(dev, p, head, name_hlist)
L
Linus Torvalds 已提交
596 597
		if (!strncmp(dev->name, name, IFNAMSIZ))
			return dev;
E
Eric Dumazet 已提交
598

L
Linus Torvalds 已提交
599 600
	return NULL;
}
E
Eric Dumazet 已提交
601
EXPORT_SYMBOL(__dev_get_by_name);
L
Linus Torvalds 已提交
602

603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628
/**
 *	dev_get_by_name_rcu	- find a device by its name
 *	@net: the applicable net namespace
 *	@name: name to find
 *
 *	Find an interface by name.
 *	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. The caller must hold RCU lock.
 */

struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
{
	struct hlist_node *p;
	struct net_device *dev;
	struct hlist_head *head = dev_name_hash(net, name);

	hlist_for_each_entry_rcu(dev, p, head, name_hlist)
		if (!strncmp(dev->name, name, IFNAMSIZ))
			return dev;

	return NULL;
}
EXPORT_SYMBOL(dev_get_by_name_rcu);

L
Linus Torvalds 已提交
629 630
/**
 *	dev_get_by_name		- find a device by its name
631
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
632 633 634 635 636 637 638 639 640
 *	@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.
 */

641
struct net_device *dev_get_by_name(struct net *net, const char *name)
L
Linus Torvalds 已提交
642 643 644
{
	struct net_device *dev;

645 646
	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
L
Linus Torvalds 已提交
647 648
	if (dev)
		dev_hold(dev);
649
	rcu_read_unlock();
L
Linus Torvalds 已提交
650 651
	return dev;
}
E
Eric Dumazet 已提交
652
EXPORT_SYMBOL(dev_get_by_name);
L
Linus Torvalds 已提交
653 654 655

/**
 *	__dev_get_by_index - find a device by its ifindex
656
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
657 658 659 660 661 662 663 664 665
 *	@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.
 */

666
struct net_device *__dev_get_by_index(struct net *net, int ifindex)
L
Linus Torvalds 已提交
667 668
{
	struct hlist_node *p;
E
Eric Dumazet 已提交
669 670
	struct net_device *dev;
	struct hlist_head *head = dev_index_hash(net, ifindex);
L
Linus Torvalds 已提交
671

E
Eric Dumazet 已提交
672
	hlist_for_each_entry(dev, p, head, index_hlist)
L
Linus Torvalds 已提交
673 674
		if (dev->ifindex == ifindex)
			return dev;
E
Eric Dumazet 已提交
675

L
Linus Torvalds 已提交
676 677
	return NULL;
}
E
Eric Dumazet 已提交
678
EXPORT_SYMBOL(__dev_get_by_index);
L
Linus Torvalds 已提交
679

680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704
/**
 *	dev_get_by_index_rcu - find a device by its ifindex
 *	@net: the applicable net namespace
 *	@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 RCU lock.
 */

struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
{
	struct hlist_node *p;
	struct net_device *dev;
	struct hlist_head *head = dev_index_hash(net, ifindex);

	hlist_for_each_entry_rcu(dev, p, head, index_hlist)
		if (dev->ifindex == ifindex)
			return dev;

	return NULL;
}
EXPORT_SYMBOL(dev_get_by_index_rcu);

L
Linus Torvalds 已提交
705 706 707

/**
 *	dev_get_by_index - find a device by its ifindex
708
 *	@net: the applicable net namespace
L
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709 710 711 712 713 714 715 716
 *	@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.
 */

717
struct net_device *dev_get_by_index(struct net *net, int ifindex)
L
Linus Torvalds 已提交
718 719 720
{
	struct net_device *dev;

721 722
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifindex);
L
Linus Torvalds 已提交
723 724
	if (dev)
		dev_hold(dev);
725
	rcu_read_unlock();
L
Linus Torvalds 已提交
726 727
	return dev;
}
E
Eric Dumazet 已提交
728
EXPORT_SYMBOL(dev_get_by_index);
L
Linus Torvalds 已提交
729 730 731

/**
 *	dev_getbyhwaddr - find a device by its hardware address
732
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
733 734 735 736 737 738 739 740 741 742 743 744
 *	@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
 */

745
struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
L
Linus Torvalds 已提交
746 747 748 749 750
{
	struct net_device *dev;

	ASSERT_RTNL();

751
	for_each_netdev(net, dev)
L
Linus Torvalds 已提交
752 753
		if (dev->type == type &&
		    !memcmp(dev->dev_addr, ha, dev->addr_len))
754 755 756
			return dev;

	return NULL;
L
Linus Torvalds 已提交
757
}
758 759
EXPORT_SYMBOL(dev_getbyhwaddr);

760
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
L
Linus Torvalds 已提交
761 762 763
{
	struct net_device *dev;

764
	ASSERT_RTNL();
765
	for_each_netdev(net, dev)
766
		if (dev->type == type)
767 768 769
			return dev;

	return NULL;
770 771 772
}
EXPORT_SYMBOL(__dev_getfirstbyhwtype);

773
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
774 775 776 777
{
	struct net_device *dev;

	rtnl_lock();
778
	dev = __dev_getfirstbyhwtype(net, type);
779 780
	if (dev)
		dev_hold(dev);
L
Linus Torvalds 已提交
781 782 783 784 785 786 787
	rtnl_unlock();
	return dev;
}
EXPORT_SYMBOL(dev_getfirstbyhwtype);

/**
 *	dev_get_by_flags - find any device with given flags
788
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
789 790 791 792
 *	@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
793
 *	is not found or a pointer to the device. The device returned has
L
Linus Torvalds 已提交
794 795 796 797
 *	had a reference added and the pointer is safe until the user calls
 *	dev_put to indicate they have finished with it.
 */

E
Eric Dumazet 已提交
798 799
struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags,
				    unsigned short mask)
L
Linus Torvalds 已提交
800
{
801
	struct net_device *dev, *ret;
L
Linus Torvalds 已提交
802

803
	ret = NULL;
804 805
	rcu_read_lock();
	for_each_netdev_rcu(net, dev) {
L
Linus Torvalds 已提交
806 807
		if (((dev->flags ^ if_flags) & mask) == 0) {
			dev_hold(dev);
808
			ret = dev;
L
Linus Torvalds 已提交
809 810 811
			break;
		}
	}
812
	rcu_read_unlock();
813
	return ret;
L
Linus Torvalds 已提交
814
}
E
Eric Dumazet 已提交
815
EXPORT_SYMBOL(dev_get_by_flags);
L
Linus Torvalds 已提交
816 817 818 819 820 821

/**
 *	dev_valid_name - check if name is okay for network device
 *	@name: name string
 *
 *	Network device names need to be valid file names to
822 823
 *	to allow sysfs to work.  We also disallow any kind of
 *	whitespace.
L
Linus Torvalds 已提交
824
 */
825
int dev_valid_name(const char *name)
L
Linus Torvalds 已提交
826
{
827 828
	if (*name == '\0')
		return 0;
829 830
	if (strlen(name) >= IFNAMSIZ)
		return 0;
831 832 833 834 835 836 837 838 839
	if (!strcmp(name, ".") || !strcmp(name, ".."))
		return 0;

	while (*name) {
		if (*name == '/' || isspace(*name))
			return 0;
		name++;
	}
	return 1;
L
Linus Torvalds 已提交
840
}
E
Eric Dumazet 已提交
841
EXPORT_SYMBOL(dev_valid_name);
L
Linus Torvalds 已提交
842 843

/**
844 845
 *	__dev_alloc_name - allocate a name for a device
 *	@net: network namespace to allocate the device name in
L
Linus Torvalds 已提交
846
 *	@name: name format string
847
 *	@buf:  scratch buffer and result name string
L
Linus Torvalds 已提交
848 849
 *
 *	Passed a format string - eg "lt%d" it will try and find a suitable
S
Stephen Hemminger 已提交
850 851 852 853 854 855
 *	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.
L
Linus Torvalds 已提交
856 857
 */

858
static int __dev_alloc_name(struct net *net, const char *name, char *buf)
L
Linus Torvalds 已提交
859 860 861 862
{
	int i = 0;
	const char *p;
	const int max_netdevices = 8*PAGE_SIZE;
S
Stephen Hemminger 已提交
863
	unsigned long *inuse;
L
Linus Torvalds 已提交
864 865 866 867 868 869 870 871 872 873 874 875 876
	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 */
S
Stephen Hemminger 已提交
877
		inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
L
Linus Torvalds 已提交
878 879 880
		if (!inuse)
			return -ENOMEM;

881
		for_each_netdev(net, d) {
L
Linus Torvalds 已提交
882 883 884 885 886 887
			if (!sscanf(d->name, name, &i))
				continue;
			if (i < 0 || i >= max_netdevices)
				continue;

			/*  avoid cases where sscanf is not exact inverse of printf */
888
			snprintf(buf, IFNAMSIZ, name, i);
L
Linus Torvalds 已提交
889 890 891 892 893 894 895 896
			if (!strncmp(buf, d->name, IFNAMSIZ))
				set_bit(i, inuse);
		}

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

897 898
	if (buf != name)
		snprintf(buf, IFNAMSIZ, name, i);
899
	if (!__dev_get_by_name(net, buf))
L
Linus Torvalds 已提交
900 901 902 903 904 905 906 907 908
		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;
}

909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928
/**
 *	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;

929 930
	BUG_ON(!dev_net(dev));
	net = dev_net(dev);
931 932 933 934 935
	ret = __dev_alloc_name(net, name, buf);
	if (ret >= 0)
		strlcpy(dev->name, buf, IFNAMSIZ);
	return ret;
}
E
Eric Dumazet 已提交
936
EXPORT_SYMBOL(dev_alloc_name);
937

938 939 940 941 942 943 944 945 946 947 948 949 950 951 952
static int dev_get_valid_name(struct net *net, const char *name, char *buf,
			      bool fmt)
{
	if (!dev_valid_name(name))
		return -EINVAL;

	if (fmt && strchr(name, '%'))
		return __dev_alloc_name(net, name, buf);
	else if (__dev_get_by_name(net, name))
		return -EEXIST;
	else if (buf != name)
		strlcpy(buf, name, IFNAMSIZ);

	return 0;
}
L
Linus Torvalds 已提交
953 954 955 956 957 958 959 960 961

/**
 *	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.
 */
962
int dev_change_name(struct net_device *dev, const char *newname)
L
Linus Torvalds 已提交
963
{
964
	char oldname[IFNAMSIZ];
L
Linus Torvalds 已提交
965
	int err = 0;
966
	int ret;
967
	struct net *net;
L
Linus Torvalds 已提交
968 969

	ASSERT_RTNL();
970
	BUG_ON(!dev_net(dev));
L
Linus Torvalds 已提交
971

972
	net = dev_net(dev);
L
Linus Torvalds 已提交
973 974 975
	if (dev->flags & IFF_UP)
		return -EBUSY;

976 977 978
	if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
		return 0;

979 980
	memcpy(oldname, dev->name, IFNAMSIZ);

981 982 983
	err = dev_get_valid_name(net, newname, dev->name, 1);
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
984

985
rollback:
986 987 988
	/* For now only devices in the initial network namespace
	 * are in sysfs.
	 */
O
Octavian Purdila 已提交
989
	if (net_eq(net, &init_net)) {
990 991 992 993 994
		ret = device_rename(&dev->dev, dev->name);
		if (ret) {
			memcpy(dev->name, oldname, IFNAMSIZ);
			return ret;
		}
995
	}
996 997

	write_lock_bh(&dev_base_lock);
998
	hlist_del(&dev->name_hlist);
999 1000 1001 1002 1003 1004
	write_unlock_bh(&dev_base_lock);

	synchronize_rcu();

	write_lock_bh(&dev_base_lock);
	hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1005 1006
	write_unlock_bh(&dev_base_lock);

1007
	ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1008 1009 1010
	ret = notifier_to_errno(ret);

	if (ret) {
1011 1012
		/* err >= 0 after dev_alloc_name() or stores the first errno */
		if (err >= 0) {
1013 1014 1015
			err = ret;
			memcpy(dev->name, oldname, IFNAMSIZ);
			goto rollback;
1016 1017 1018 1019
		} else {
			printk(KERN_ERR
			       "%s: name change rollback failed: %d.\n",
			       dev->name, ret);
1020 1021
		}
	}
L
Linus Torvalds 已提交
1022 1023 1024 1025

	return err;
}

1026 1027 1028 1029
/**
 *	dev_set_alias - change ifalias of a device
 *	@dev: device
 *	@alias: name up to IFALIASZ
1030
 *	@len: limit of bytes to copy from info
1031 1032 1033 1034 1035 1036 1037 1038 1039 1040
 *
 *	Set ifalias for a device,
 */
int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
{
	ASSERT_RTNL();

	if (len >= IFALIASZ)
		return -EINVAL;

1041 1042 1043 1044 1045 1046 1047 1048
	if (!len) {
		if (dev->ifalias) {
			kfree(dev->ifalias);
			dev->ifalias = NULL;
		}
		return 0;
	}

E
Eric Dumazet 已提交
1049
	dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1050 1051 1052 1053 1054 1055 1056 1057
	if (!dev->ifalias)
		return -ENOMEM;

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


1058
/**
S
Stephen Hemminger 已提交
1059
 *	netdev_features_change - device changes features
1060 1061 1062 1063 1064 1065
 *	@dev: device to cause notification
 *
 *	Called to indicate a device has changed features.
 */
void netdev_features_change(struct net_device *dev)
{
1066
	call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1067 1068 1069
}
EXPORT_SYMBOL(netdev_features_change);

L
Linus Torvalds 已提交
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080
/**
 *	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) {
1081
		call_netdevice_notifiers(NETDEV_CHANGE, dev);
L
Linus Torvalds 已提交
1082 1083 1084
		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
	}
}
E
Eric Dumazet 已提交
1085
EXPORT_SYMBOL(netdev_state_change);
L
Linus Torvalds 已提交
1086

1087
void netdev_bonding_change(struct net_device *dev, unsigned long event)
1088
{
1089
	call_netdevice_notifiers(event, dev);
1090 1091 1092
}
EXPORT_SYMBOL(netdev_bonding_change);

L
Linus Torvalds 已提交
1093 1094
/**
 *	dev_load 	- load a network module
1095
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
1096 1097 1098 1099 1100 1101 1102
 *	@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.
 */

1103
void dev_load(struct net *net, const char *name)
L
Linus Torvalds 已提交
1104
{
1105
	struct net_device *dev;
L
Linus Torvalds 已提交
1106

1107 1108 1109
	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
	rcu_read_unlock();
L
Linus Torvalds 已提交
1110

1111
	if (!dev && capable(CAP_NET_ADMIN))
L
Linus Torvalds 已提交
1112 1113
		request_module("%s", name);
}
E
Eric Dumazet 已提交
1114
EXPORT_SYMBOL(dev_load);
L
Linus Torvalds 已提交
1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129

/**
 *	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)
{
1130
	const struct net_device_ops *ops = dev->netdev_ops;
1131
	int ret;
L
Linus Torvalds 已提交
1132

1133 1134
	ASSERT_RTNL();

L
Linus Torvalds 已提交
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
	/*
	 *	Is it already up?
	 */

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

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

1148 1149 1150 1151 1152
	ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		return ret;

L
Linus Torvalds 已提交
1153 1154 1155 1156
	/*
	 *	Call device private open method
	 */
	set_bit(__LINK_STATE_START, &dev->state);
1157

1158 1159
	if (ops->ndo_validate_addr)
		ret = ops->ndo_validate_addr(dev);
1160

1161 1162
	if (!ret && ops->ndo_open)
		ret = ops->ndo_open(dev);
L
Linus Torvalds 已提交
1163

1164
	/*
L
Linus Torvalds 已提交
1165 1166 1167
	 *	If it went open OK then:
	 */

1168 1169 1170
	if (ret)
		clear_bit(__LINK_STATE_START, &dev->state);
	else {
L
Linus Torvalds 已提交
1171 1172 1173 1174 1175
		/*
		 *	Set the flags.
		 */
		dev->flags |= IFF_UP;

1176 1177 1178
		/*
		 *	Enable NET_DMA
		 */
1179
		net_dmaengine_get();
1180

L
Linus Torvalds 已提交
1181 1182 1183
		/*
		 *	Initialize multicasting status
		 */
1184
		dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
1185 1186 1187 1188 1189 1190 1191 1192 1193

		/*
		 *	Wakeup transmit queue engine
		 */
		dev_activate(dev);

		/*
		 *	... and announce new interface.
		 */
1194
		call_netdevice_notifiers(NETDEV_UP, dev);
L
Linus Torvalds 已提交
1195
	}
1196

L
Linus Torvalds 已提交
1197 1198
	return ret;
}
E
Eric Dumazet 已提交
1199
EXPORT_SYMBOL(dev_open);
L
Linus Torvalds 已提交
1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211

/**
 *	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)
{
1212
	const struct net_device_ops *ops = dev->netdev_ops;
1213 1214
	ASSERT_RTNL();

1215 1216
	might_sleep();

L
Linus Torvalds 已提交
1217 1218 1219 1220 1221 1222 1223
	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.
	 */
1224
	call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
L
Linus Torvalds 已提交
1225 1226 1227 1228

	clear_bit(__LINK_STATE_START, &dev->state);

	/* Synchronize to scheduled poll. We cannot touch poll list,
1229 1230 1231 1232 1233
	 * 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.
	 */
L
Linus Torvalds 已提交
1234 1235
	smp_mb__after_clear_bit(); /* Commit netif_running(). */

1236 1237
	dev_deactivate(dev);

L
Linus Torvalds 已提交
1238 1239 1240 1241 1242 1243 1244
	/*
	 *	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.
	 */
1245 1246
	if (ops->ndo_stop)
		ops->ndo_stop(dev);
L
Linus Torvalds 已提交
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256

	/*
	 *	Device is now down.
	 */

	dev->flags &= ~IFF_UP;

	/*
	 * Tell people we are down
	 */
1257
	call_netdevice_notifiers(NETDEV_DOWN, dev);
L
Linus Torvalds 已提交
1258

1259 1260 1261
	/*
	 *	Shutdown NET_DMA
	 */
1262
	net_dmaengine_put();
1263

L
Linus Torvalds 已提交
1264 1265
	return 0;
}
E
Eric Dumazet 已提交
1266
EXPORT_SYMBOL(dev_close);
L
Linus Torvalds 已提交
1267 1268


1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291
/**
 *	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);


1292 1293
static int dev_boot_phase = 1;

L
Linus Torvalds 已提交
1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308
/*
 *	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
1309
 *	to the new notifier to allow device to have a race free
L
Linus Torvalds 已提交
1310 1311 1312 1313 1314 1315
 *	view of the network device list.
 */

int register_netdevice_notifier(struct notifier_block *nb)
{
	struct net_device *dev;
1316
	struct net_device *last;
1317
	struct net *net;
L
Linus Torvalds 已提交
1318 1319 1320
	int err;

	rtnl_lock();
1321
	err = raw_notifier_chain_register(&netdev_chain, nb);
1322 1323
	if (err)
		goto unlock;
1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
	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
1335

1336 1337
			nb->notifier_call(nb, NETDEV_UP, dev);
		}
L
Linus Torvalds 已提交
1338
	}
1339 1340

unlock:
L
Linus Torvalds 已提交
1341 1342
	rtnl_unlock();
	return err;
1343 1344 1345

rollback:
	last = dev;
1346 1347 1348 1349
	for_each_net(net) {
		for_each_netdev(net, dev) {
			if (dev == last)
				break;
1350

1351 1352 1353 1354 1355
			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);
1356
			nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1357 1358
		}
	}
1359 1360

	raw_notifier_chain_unregister(&netdev_chain, nb);
1361
	goto unlock;
L
Linus Torvalds 已提交
1362
}
E
Eric Dumazet 已提交
1363
EXPORT_SYMBOL(register_netdevice_notifier);
L
Linus Torvalds 已提交
1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376

/**
 *	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)
{
1377 1378 1379
	int err;

	rtnl_lock();
1380
	err = raw_notifier_chain_unregister(&netdev_chain, nb);
1381 1382
	rtnl_unlock();
	return err;
L
Linus Torvalds 已提交
1383
}
E
Eric Dumazet 已提交
1384
EXPORT_SYMBOL(unregister_netdevice_notifier);
L
Linus Torvalds 已提交
1385 1386 1387 1388

/**
 *	call_netdevice_notifiers - call all network notifier blocks
 *      @val: value passed unmodified to notifier function
1389
 *      @dev: net_device pointer passed unmodified to notifier function
L
Linus Torvalds 已提交
1390 1391
 *
 *	Call all network notifier blocks.  Parameters and return value
1392
 *	are as for raw_notifier_call_chain().
L
Linus Torvalds 已提交
1393 1394
 */

1395
int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
L
Linus Torvalds 已提交
1396
{
1397
	return raw_notifier_call_chain(&netdev_chain, val, dev);
L
Linus Torvalds 已提交
1398 1399 1400 1401 1402 1403 1404 1405 1406
}

/* 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);
}
E
Eric Dumazet 已提交
1407
EXPORT_SYMBOL(net_enable_timestamp);
L
Linus Torvalds 已提交
1408 1409 1410 1411 1412

void net_disable_timestamp(void)
{
	atomic_dec(&netstamp_needed);
}
E
Eric Dumazet 已提交
1413
EXPORT_SYMBOL(net_disable_timestamp);
L
Linus Torvalds 已提交
1414

1415
static inline void net_timestamp(struct sk_buff *skb)
L
Linus Torvalds 已提交
1416 1417
{
	if (atomic_read(&netstamp_needed))
1418
		__net_timestamp(skb);
1419 1420
	else
		skb->tstamp.tv64 = 0;
L
Linus Torvalds 已提交
1421 1422
}

1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461
/**
 * dev_forward_skb - loopback an skb to another netif
 *
 * @dev: destination network device
 * @skb: buffer to forward
 *
 * return values:
 *	NET_RX_SUCCESS	(no congestion)
 *	NET_RX_DROP     (packet was dropped)
 *
 * dev_forward_skb can be used for injecting an skb from the
 * start_xmit function of one device into the receive queue
 * of another device.
 *
 * The receiving device may be in another namespace, so
 * we have to clear all information in the skb that could
 * impact namespace isolation.
 */
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
{
	skb_orphan(skb);

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

	if (skb->len > (dev->mtu + dev->hard_header_len))
		return NET_RX_DROP;

	skb_dst_drop(skb);
	skb->tstamp.tv64 = 0;
	skb->pkt_type = PACKET_HOST;
	skb->protocol = eth_type_trans(skb, dev);
	skb->mark = 0;
	secpath_reset(skb);
	nf_reset(skb);
	return netif_rx(skb);
}
EXPORT_SYMBOL_GPL(dev_forward_skb);

L
Linus Torvalds 已提交
1462 1463 1464 1465 1466
/*
 *	Support routine. Sends outgoing frames to any network
 *	taps currently in use.
 */

1467
static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
L
Linus Torvalds 已提交
1468 1469
{
	struct packet_type *ptype;
1470

1471 1472 1473 1474
#ifdef CONFIG_NET_CLS_ACT
	if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
		net_timestamp(skb);
#else
1475
	net_timestamp(skb);
1476
#endif
L
Linus Torvalds 已提交
1477 1478 1479 1480 1481 1482 1483 1484 1485

	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)) {
E
Eric Dumazet 已提交
1486
			struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
L
Linus Torvalds 已提交
1487 1488 1489 1490 1491 1492 1493
			if (!skb2)
				break;

			/* skb->nh should be correctly
			   set by sender, so that the second statement is
			   just protection against buggy protocols.
			 */
1494
			skb_reset_mac_header(skb2);
L
Linus Torvalds 已提交
1495

1496
			if (skb_network_header(skb2) < skb2->data ||
1497
			    skb2->network_header > skb2->tail) {
L
Linus Torvalds 已提交
1498 1499 1500 1501
				if (net_ratelimit())
					printk(KERN_CRIT "protocol %04x is "
					       "buggy, dev %s\n",
					       skb2->protocol, dev->name);
1502
				skb_reset_network_header(skb2);
L
Linus Torvalds 已提交
1503 1504
			}

1505
			skb2->transport_header = skb2->network_header;
L
Linus Torvalds 已提交
1506
			skb2->pkt_type = PACKET_OUTGOING;
D
David S. Miller 已提交
1507
			ptype->func(skb2, skb->dev, ptype, skb->dev);
L
Linus Torvalds 已提交
1508 1509 1510 1511 1512
		}
	}
	rcu_read_unlock();
}

1513

1514
static inline void __netif_reschedule(struct Qdisc *q)
1515
{
1516 1517
	struct softnet_data *sd;
	unsigned long flags;
1518

1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530
	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);
1531 1532 1533
}
EXPORT_SYMBOL(__netif_schedule);

1534
void dev_kfree_skb_irq(struct sk_buff *skb)
1535
{
1536 1537 1538
	if (atomic_dec_and_test(&skb->users)) {
		struct softnet_data *sd;
		unsigned long flags;
1539

1540 1541 1542 1543 1544 1545 1546
		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);
	}
1547
}
1548
EXPORT_SYMBOL(dev_kfree_skb_irq);
1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559

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);


1560 1561 1562 1563 1564 1565
/**
 * netif_device_detach - mark device as removed
 * @dev: network device
 *
 * Mark device as removed from system and therefore no longer available.
 */
1566 1567 1568 1569
void netif_device_detach(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
1570
		netif_tx_stop_all_queues(dev);
1571 1572 1573 1574
	}
}
EXPORT_SYMBOL(netif_device_detach);

1575 1576 1577 1578 1579 1580
/**
 * netif_device_attach - mark device as attached
 * @dev: network device
 *
 * Mark device as attached from system and restart if needed.
 */
1581 1582 1583 1584
void netif_device_attach(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
1585
		netif_tx_wake_all_queues(dev);
1586
		__netdev_watchdog_up(dev);
1587 1588 1589 1590
	}
}
EXPORT_SYMBOL(netif_device_attach);

1591 1592 1593 1594 1595 1596
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) &&
1597 1598 1599
		 protocol == htons(ETH_P_IPV6)) ||
		((features & NETIF_F_FCOE_CRC) &&
		 protocol == htons(ETH_P_FCOE)));
1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615
}

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;
}
1616

L
Linus Torvalds 已提交
1617 1618 1619 1620
/*
 * Invalidate hardware checksum when packet is to be mangled, and
 * complete checksum manually on outgoing path.
 */
1621
int skb_checksum_help(struct sk_buff *skb)
L
Linus Torvalds 已提交
1622
{
1623
	__wsum csum;
1624
	int ret = 0, offset;
L
Linus Torvalds 已提交
1625

1626
	if (skb->ip_summed == CHECKSUM_COMPLETE)
1627 1628 1629 1630 1631
		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
1632 1633
	}

1634 1635 1636 1637 1638 1639 1640 1641 1642
	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
1643 1644 1645 1646 1647
		ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
		if (ret)
			goto out;
	}

1648
	*(__sum16 *)(skb->data + offset) = csum_fold(csum);
1649
out_set_summed:
L
Linus Torvalds 已提交
1650
	skb->ip_summed = CHECKSUM_NONE;
1651
out:
L
Linus Torvalds 已提交
1652 1653
	return ret;
}
E
Eric Dumazet 已提交
1654
EXPORT_SYMBOL(skb_checksum_help);
L
Linus Torvalds 已提交
1655

1656 1657 1658
/**
 *	skb_gso_segment - Perform segmentation on skb.
 *	@skb: buffer to segment
1659
 *	@features: features for the output path (see dev->features)
1660 1661
 *
 *	This function segments the given skb and returns a list of segments.
1662 1663 1664
 *
 *	It may return NULL if the skb requires no segmentation.  This is
 *	only possible when GSO is used for verifying header integrity.
1665
 */
1666
struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1667 1668 1669
{
	struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
	struct packet_type *ptype;
A
Al Viro 已提交
1670
	__be16 type = skb->protocol;
1671
	int err;
1672

1673
	skb_reset_mac_header(skb);
1674
	skb->mac_len = skb->network_header - skb->mac_header;
1675 1676
	__skb_pull(skb, skb->mac_len);

1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689
	if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
		struct net_device *dev = skb->dev;
		struct ethtool_drvinfo info = {};

		if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
			dev->ethtool_ops->get_drvinfo(dev, &info);

		WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
			"ip_summed=%d",
		     info.driver, dev ? dev->features : 0L,
		     skb->sk ? skb->sk->sk_route_caps : 0L,
		     skb->len, skb->data_len, skb->ip_summed);

1690 1691 1692 1693 1694
		if (skb_header_cloned(skb) &&
		    (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
			return ERR_PTR(err);
	}

1695
	rcu_read_lock();
1696 1697
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1698
		if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1699
			if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1700 1701 1702 1703
				err = ptype->gso_send_check(skb);
				segs = ERR_PTR(err);
				if (err || skb_gso_ok(skb, features))
					break;
1704 1705
				__skb_push(skb, (skb->data -
						 skb_network_header(skb)));
1706
			}
1707
			segs = ptype->gso_segment(skb, features);
1708 1709 1710 1711 1712
			break;
		}
	}
	rcu_read_unlock();

1713
	__skb_push(skb, skb->data - skb_mac_header(skb));
1714

1715 1716 1717 1718
	return segs;
}
EXPORT_SYMBOL(skb_gso_segment);

1719 1720 1721 1722 1723
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG
void netdev_rx_csum_fault(struct net_device *dev)
{
	if (net_ratelimit()) {
1724
		printk(KERN_ERR "%s: hw csum failure.\n",
1725
			dev ? dev->name : "<unknown>");
1726 1727 1728 1729 1730 1731
		dump_stack();
	}
}
EXPORT_SYMBOL(netdev_rx_csum_fault);
#endif

L
Linus Torvalds 已提交
1732 1733 1734 1735 1736 1737 1738
/* 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)
{
1739
#ifdef CONFIG_HIGHMEM
L
Linus Torvalds 已提交
1740 1741 1742 1743 1744 1745 1746 1747 1748
	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;

1749
#endif
L
Linus Torvalds 已提交
1750 1751 1752
	return 0;
}

1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786
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;
1787 1788 1789 1790 1791 1792 1793 1794
	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;
1795

1796
	if (IS_ERR(segs))
1797 1798 1799 1800 1801 1802 1803 1804 1805
		return PTR_ERR(segs);

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

	return 0;
}

1806 1807
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
			struct netdev_queue *txq)
1808
{
1809
	const struct net_device_ops *ops = dev->netdev_ops;
1810
	int rc = NETDEV_TX_OK;
1811

1812
	if (likely(!skb->next)) {
S
Stephen Hemminger 已提交
1813
		if (!list_empty(&ptype_all))
1814 1815
			dev_queue_xmit_nit(skb, dev);

1816 1817 1818 1819 1820 1821
		if (netif_needs_gso(dev, skb)) {
			if (unlikely(dev_gso_segment(skb)))
				goto out_kfree_skb;
			if (skb->next)
				goto gso;
		}
1822

1823 1824 1825 1826
		/*
		 * If device doesnt need skb->dst, release it right now while
		 * its hot in this cpu cache
		 */
E
Eric Dumazet 已提交
1827 1828 1829
		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
			skb_dst_drop(skb);

1830
		rc = ops->ndo_start_xmit(skb, dev);
1831
		if (rc == NETDEV_TX_OK)
E
Eric Dumazet 已提交
1832
			txq_trans_update(txq);
1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847
		/*
		 * TODO: if skb_orphan() was called by
		 * dev->hard_start_xmit() (for example, the unmodified
		 * igb driver does that; bnx2 doesn't), then
		 * skb_tx_software_timestamp() will be unable to send
		 * back the time stamp.
		 *
		 * How can this be prevented? Always create another
		 * reference to the socket before calling
		 * dev->hard_start_xmit()? Prevent that skb_orphan()
		 * does anything in dev->hard_start_xmit() by clearing
		 * the skb destructor before the call and restoring it
		 * afterwards, then doing the skb_orphan() ourselves?
		 */
		return rc;
1848 1849
	}

1850
gso:
1851 1852 1853 1854 1855
	do {
		struct sk_buff *nskb = skb->next;

		skb->next = nskb->next;
		nskb->next = NULL;
1856 1857 1858 1859 1860 1861 1862 1863

		/*
		 * If device doesnt need nskb->dst, release it right now while
		 * its hot in this cpu cache
		 */
		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
			skb_dst_drop(nskb);

1864
		rc = ops->ndo_start_xmit(nskb, dev);
1865
		if (unlikely(rc != NETDEV_TX_OK)) {
1866 1867
			if (rc & ~NETDEV_TX_MASK)
				goto out_kfree_gso_skb;
1868
			nskb->next = skb->next;
1869 1870 1871
			skb->next = nskb;
			return rc;
		}
E
Eric Dumazet 已提交
1872
		txq_trans_update(txq);
1873
		if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1874
			return NETDEV_TX_BUSY;
1875
	} while (skb->next);
1876

1877 1878 1879
out_kfree_gso_skb:
	if (likely(skb->next == NULL))
		skb->destructor = DEV_GSO_CB(skb)->destructor;
1880 1881
out_kfree_skb:
	kfree_skb(skb);
1882
	return rc;
1883 1884
}

1885
static u32 skb_tx_hashrnd;
D
David S. Miller 已提交
1886

1887
u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
1888
{
1889
	u32 hash;
D
David S. Miller 已提交
1890

1891 1892
	if (skb_rx_queue_recorded(skb)) {
		hash = skb_get_rx_queue(skb);
E
Eric Dumazet 已提交
1893
		while (unlikely(hash >= dev->real_num_tx_queues))
1894 1895 1896
			hash -= dev->real_num_tx_queues;
		return hash;
	}
1897 1898

	if (skb->sk && skb->sk->sk_hash)
1899
		hash = skb->sk->sk_hash;
1900
	else
1901
		hash = skb->protocol;
1902

1903
	hash = jhash_1word(hash, skb_tx_hashrnd);
D
David S. Miller 已提交
1904 1905

	return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1906
}
1907
EXPORT_SYMBOL(skb_tx_hash);
1908

1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922
static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
{
	if (unlikely(queue_index >= dev->real_num_tx_queues)) {
		if (net_ratelimit()) {
			WARN(1, "%s selects TX queue %d, but "
			     "real number of TX queues is %d\n",
			     dev->name, queue_index,
			     dev->real_num_tx_queues);
		}
		return 0;
	}
	return queue_index;
}

1923 1924 1925
static struct netdev_queue *dev_pick_tx(struct net_device *dev,
					struct sk_buff *skb)
{
1926 1927 1928 1929 1930 1931 1932 1933 1934 1935
	u16 queue_index;
	struct sock *sk = skb->sk;

	if (sk_tx_queue_recorded(sk)) {
		queue_index = sk_tx_queue_get(sk);
	} else {
		const struct net_device_ops *ops = dev->netdev_ops;

		if (ops->ndo_select_queue) {
			queue_index = ops->ndo_select_queue(dev, skb);
1936
			queue_index = dev_cap_txqueue(dev, queue_index);
1937 1938 1939 1940
		} else {
			queue_index = 0;
			if (dev->real_num_tx_queues > 1)
				queue_index = skb_tx_hash(dev, skb);
1941

1942 1943 1944 1945
			if (sk && sk->sk_dst_cache)
				sk_tx_queue_set(sk, queue_index);
		}
	}
1946

1947 1948
	skb_set_queue_mapping(skb, queue_index);
	return netdev_get_tx_queue(dev, queue_index);
1949 1950
}

1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984
static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
				 struct net_device *dev,
				 struct netdev_queue *txq)
{
	spinlock_t *root_lock = qdisc_lock(q);
	int rc;

	spin_lock(root_lock);
	if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
		kfree_skb(skb);
		rc = NET_XMIT_DROP;
	} else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
		   !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) {
		/*
		 * This is a work-conserving queue; there are no old skbs
		 * waiting to be sent out; and the qdisc is not running -
		 * xmit the skb directly.
		 */
		__qdisc_update_bstats(q, skb->len);
		if (sch_direct_xmit(skb, q, dev, txq, root_lock))
			__qdisc_run(q);
		else
			clear_bit(__QDISC_STATE_RUNNING, &q->state);

		rc = NET_XMIT_SUCCESS;
	} else {
		rc = qdisc_enqueue_root(skb, q);
		qdisc_run(q);
	}
	spin_unlock(root_lock);

	return rc;
}

1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
/**
 *	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
2010 2011 2012
int dev_queue_xmit(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
2013
	struct netdev_queue *txq;
L
Linus Torvalds 已提交
2014 2015 2016
	struct Qdisc *q;
	int rc = -ENOMEM;

2017 2018 2019 2020
	/* GSO will handle the following emulations directly. */
	if (netif_needs_gso(dev, skb))
		goto gso;

2021
	if (skb_has_frags(skb) &&
L
Linus Torvalds 已提交
2022
	    !(dev->features & NETIF_F_FRAGLIST) &&
H
Herbert Xu 已提交
2023
	    __skb_linearize(skb))
L
Linus Torvalds 已提交
2024 2025 2026 2027 2028 2029 2030 2031
		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
2032
	    __skb_linearize(skb))
L
Linus Torvalds 已提交
2033 2034 2035 2036 2037
		goto out_kfree_skb;

	/* If packet is not checksummed and device does not support
	 * checksumming for this protocol, complete checksumming here.
	 */
2038 2039 2040
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
		skb_set_transport_header(skb, skb->csum_start -
					      skb_headroom(skb));
2041 2042
		if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
			goto out_kfree_skb;
2043
	}
L
Linus Torvalds 已提交
2044

2045
gso:
2046 2047
	/* Disable soft irqs for various locks below. Also
	 * stops preemption for RCU.
L
Linus Torvalds 已提交
2048
	 */
2049
	rcu_read_lock_bh();
L
Linus Torvalds 已提交
2050

2051
	txq = dev_pick_tx(dev, skb);
2052
	q = rcu_dereference(txq->qdisc);
2053

L
Linus Torvalds 已提交
2054
#ifdef CONFIG_NET_CLS_ACT
E
Eric Dumazet 已提交
2055
	skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
L
Linus Torvalds 已提交
2056 2057
#endif
	if (q->enqueue) {
2058
		rc = __dev_xmit_skb(skb, q, dev, txq);
2059
		goto out;
L
Linus Torvalds 已提交
2060 2061 2062 2063 2064
	}

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

H
Herbert Xu 已提交
2065 2066
	   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
2067 2068 2069 2070 2071 2072 2073 2074 2075 2076
	   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 */

2077
		if (txq->xmit_lock_owner != cpu) {
L
Linus Torvalds 已提交
2078

2079
			HARD_TX_LOCK(dev, txq, cpu);
L
Linus Torvalds 已提交
2080

2081
			if (!netif_tx_queue_stopped(txq)) {
2082 2083
				rc = dev_hard_start_xmit(skb, dev, txq);
				if (dev_xmit_complete(rc)) {
2084
					HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
2085 2086 2087
					goto out;
				}
			}
2088
			HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101
			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;
2102
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
2103 2104 2105 2106 2107

out_kfree_skb:
	kfree_skb(skb);
	return rc;
out:
2108
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
2109 2110
	return rc;
}
E
Eric Dumazet 已提交
2111
EXPORT_SYMBOL(dev_queue_xmit);
L
Linus Torvalds 已提交
2112 2113 2114 2115 2116 2117


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

2118 2119 2120
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
2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148

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;

2149
	if (!skb->tstamp.tv64)
2150
		net_timestamp(skb);
L
Linus Torvalds 已提交
2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164

	/*
	 * 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);
2165
			return NET_RX_SUCCESS;
L
Linus Torvalds 已提交
2166 2167
		}

2168
		napi_schedule(&queue->backlog);
L
Linus Torvalds 已提交
2169 2170 2171 2172 2173 2174 2175 2176 2177
		goto enqueue;
	}

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

	kfree_skb(skb);
	return NET_RX_DROP;
}
E
Eric Dumazet 已提交
2178
EXPORT_SYMBOL(netif_rx);
L
Linus Torvalds 已提交
2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209

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;

2210
			WARN_ON(atomic_read(&skb->users));
L
Linus Torvalds 已提交
2211 2212 2213 2214 2215
			__kfree_skb(skb);
		}
	}

	if (sd->output_queue) {
2216
		struct Qdisc *head;
L
Linus Torvalds 已提交
2217 2218 2219 2220 2221 2222 2223

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

		while (head) {
2224 2225 2226
			struct Qdisc *q = head;
			spinlock_t *root_lock;

L
Linus Torvalds 已提交
2227 2228
			head = head->next_sched;

2229
			root_lock = qdisc_lock(q);
2230
			if (spin_trylock(root_lock)) {
2231 2232 2233
				smp_mb__before_clear_bit();
				clear_bit(__QDISC_STATE_SCHED,
					  &q->state);
2234 2235
				qdisc_run(q);
				spin_unlock(root_lock);
L
Linus Torvalds 已提交
2236
			} else {
2237
				if (!test_bit(__QDISC_STATE_DEACTIVATED,
2238
					      &q->state)) {
2239
					__netif_reschedule(q);
2240 2241 2242 2243 2244
				} else {
					smp_mb__before_clear_bit();
					clear_bit(__QDISC_STATE_SCHED,
						  &q->state);
				}
L
Linus Torvalds 已提交
2245 2246 2247 2248 2249
			}
		}
	}
}

2250 2251 2252
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
2253 2254
{
	atomic_inc(&skb->users);
D
David S. Miller 已提交
2255
	return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2256 2257 2258
}

#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2259 2260 2261 2262 2263

#if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
/* This hook is defined here for ATM LANE */
int (*br_fdb_test_addr_hook)(struct net_device *dev,
			     unsigned char *addr) __read_mostly;
2264
EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2265
#endif
L
Linus Torvalds 已提交
2266

2267 2268 2269 2270 2271 2272
/*
 * 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;
2273
EXPORT_SYMBOL_GPL(br_handle_frame_hook);
2274

2275 2276 2277
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
2278 2279 2280
{
	struct net_bridge_port *port;

2281 2282 2283
	if (skb->pkt_type == PACKET_LOOPBACK ||
	    (port = rcu_dereference(skb->dev->br_port)) == NULL)
		return skb;
L
Linus Torvalds 已提交
2284 2285

	if (*pt_prev) {
2286
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
L
Linus Torvalds 已提交
2287
		*pt_prev = NULL;
2288 2289
	}

2290
	return br_handle_frame_hook(port, skb);
L
Linus Torvalds 已提交
2291 2292
}
#else
2293
#define handle_bridge(skb, pt_prev, ret, orig_dev)	(skb)
L
Linus Torvalds 已提交
2294 2295
#endif

P
Patrick McHardy 已提交
2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317
#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
2318 2319 2320 2321 2322
#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
2323
 * NOTE: This doesnt stop any functionality; if you dont have
L
Linus Torvalds 已提交
2324 2325 2326
 * the ingress scheduler, you just cant add policies on ingress.
 *
 */
2327
static int ing_filter(struct sk_buff *skb)
L
Linus Torvalds 已提交
2328 2329
{
	struct net_device *dev = skb->dev;
2330
	u32 ttl = G_TC_RTTL(skb->tc_verd);
2331 2332 2333
	struct netdev_queue *rxq;
	int result = TC_ACT_OK;
	struct Qdisc *q;
2334

2335 2336 2337
	if (MAX_RED_LOOP < ttl++) {
		printk(KERN_WARNING
		       "Redir loop detected Dropping packet (%d->%d)\n",
2338
		       skb->skb_iif, dev->ifindex);
2339 2340
		return TC_ACT_SHOT;
	}
L
Linus Torvalds 已提交
2341

2342 2343
	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
2344

2345 2346
	rxq = &dev->rx_queue;

2347
	q = rxq->qdisc;
2348
	if (q != &noop_qdisc) {
2349
		spin_lock(qdisc_lock(q));
2350 2351
		if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
			result = qdisc_enqueue_root(skb, q);
2352 2353
		spin_unlock(qdisc_lock(q));
	}
2354 2355 2356

	return result;
}
2357

2358 2359 2360 2361
static inline struct sk_buff *handle_ing(struct sk_buff *skb,
					 struct packet_type **pt_prev,
					 int *ret, struct net_device *orig_dev)
{
2362
	if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2363
		goto out;
L
Linus Torvalds 已提交
2364

2365 2366 2367 2368 2369 2370
	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
2371 2372
	}

2373 2374 2375 2376 2377 2378 2379 2380 2381 2382
	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
2383 2384 2385
}
#endif

2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412
/*
 * 	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();
}

2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427
/**
 *	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
2428 2429 2430
int netif_receive_skb(struct sk_buff *skb)
{
	struct packet_type *ptype, *pt_prev;
D
David S. Miller 已提交
2431
	struct net_device *orig_dev;
2432
	struct net_device *null_or_orig;
L
Linus Torvalds 已提交
2433
	int ret = NET_RX_DROP;
A
Al Viro 已提交
2434
	__be16 type;
L
Linus Torvalds 已提交
2435

2436 2437 2438
	if (!skb->tstamp.tv64)
		net_timestamp(skb);

E
Eric Dumazet 已提交
2439
	if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2440 2441
		return NET_RX_SUCCESS;

L
Linus Torvalds 已提交
2442
	/* if we've gotten here through NAPI, check netpoll */
2443
	if (netpoll_receive_skb(skb))
L
Linus Torvalds 已提交
2444 2445
		return NET_RX_DROP;

2446 2447
	if (!skb->skb_iif)
		skb->skb_iif = skb->dev->ifindex;
2448

2449
	null_or_orig = NULL;
J
Joe Eykholt 已提交
2450 2451
	orig_dev = skb->dev;
	if (orig_dev->master) {
2452 2453 2454 2455
		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
2456
	}
2457

L
Linus Torvalds 已提交
2458 2459
	__get_cpu_var(netdev_rx_stat).total++;

2460
	skb_reset_network_header(skb);
2461
	skb_reset_transport_header(skb);
2462
	skb->mac_len = skb->network_header - skb->mac_header;
L
Linus Torvalds 已提交
2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475

	pt_prev = NULL;

	rcu_read_lock();

#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) {
2476 2477
		if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
		    ptype->dev == orig_dev) {
2478
			if (pt_prev)
D
David S. Miller 已提交
2479
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2480 2481 2482 2483 2484
			pt_prev = ptype;
		}
	}

#ifdef CONFIG_NET_CLS_ACT
2485 2486
	skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
	if (!skb)
L
Linus Torvalds 已提交
2487 2488 2489 2490
		goto out;
ncls:
#endif

2491
	skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
P
Patrick McHardy 已提交
2492 2493 2494
	if (!skb)
		goto out;
	skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2495
	if (!skb)
L
Linus Torvalds 已提交
2496 2497 2498
		goto out;

	type = skb->protocol;
2499 2500
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
L
Linus Torvalds 已提交
2501
		if (ptype->type == type &&
2502 2503
		    (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
		     ptype->dev == orig_dev)) {
2504
			if (pt_prev)
D
David S. Miller 已提交
2505
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2506 2507 2508 2509 2510
			pt_prev = ptype;
		}
	}

	if (pt_prev) {
D
David S. Miller 已提交
2511
		ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523
	} 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;
}
E
Eric Dumazet 已提交
2524
EXPORT_SYMBOL(netif_receive_skb);
L
Linus Torvalds 已提交
2525

2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539
/* 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);
		}
}

2540 2541 2542 2543 2544 2545 2546
static int napi_gro_complete(struct sk_buff *skb)
{
	struct packet_type *ptype;
	__be16 type = skb->protocol;
	struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
	int err = -ENOENT;

2547 2548
	if (NAPI_GRO_CB(skb)->count == 1) {
		skb_shinfo(skb)->gso_size = 0;
2549
		goto out;
2550
	}
2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581

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

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

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

out:
	return netif_receive_skb(skb);
}

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

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

2582
	napi->gro_count = 0;
2583 2584 2585 2586
	napi->gro_list = NULL;
}
EXPORT_SYMBOL(napi_gro_flush);

2587
enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2588 2589 2590 2591 2592
{
	struct sk_buff **pp = NULL;
	struct packet_type *ptype;
	__be16 type = skb->protocol;
	struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
H
Herbert Xu 已提交
2593
	int same_flow;
2594
	int mac_len;
2595
	enum gro_result ret;
2596 2597 2598 2599

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

2600
	if (skb_is_gso(skb) || skb_has_frags(skb))
2601 2602
		goto normal;

2603 2604 2605 2606 2607
	rcu_read_lock();
	list_for_each_entry_rcu(ptype, head, list) {
		if (ptype->type != type || ptype->dev || !ptype->gro_receive)
			continue;

2608
		skb_set_network_header(skb, skb_gro_offset(skb));
2609 2610 2611 2612
		mac_len = skb->network_header - skb->mac_header;
		skb->mac_len = mac_len;
		NAPI_GRO_CB(skb)->same_flow = 0;
		NAPI_GRO_CB(skb)->flush = 0;
H
Herbert Xu 已提交
2613
		NAPI_GRO_CB(skb)->free = 0;
2614 2615 2616 2617 2618 2619 2620 2621 2622

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

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

H
Herbert Xu 已提交
2623
	same_flow = NAPI_GRO_CB(skb)->same_flow;
2624
	ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
H
Herbert Xu 已提交
2625

2626 2627 2628 2629 2630 2631
	if (pp) {
		struct sk_buff *nskb = *pp;

		*pp = nskb->next;
		nskb->next = NULL;
		napi_gro_complete(nskb);
2632
		napi->gro_count--;
2633 2634
	}

H
Herbert Xu 已提交
2635
	if (same_flow)
2636 2637
		goto ok;

2638
	if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
2639 2640
		goto normal;

2641
	napi->gro_count++;
2642
	NAPI_GRO_CB(skb)->count = 1;
2643
	skb_shinfo(skb)->gso_size = skb_gro_len(skb);
2644 2645
	skb->next = napi->gro_list;
	napi->gro_list = skb;
2646
	ret = GRO_HELD;
2647

2648
pull:
H
Herbert Xu 已提交
2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667
	if (skb_headlen(skb) < skb_gro_offset(skb)) {
		int grow = skb_gro_offset(skb) - skb_headlen(skb);

		BUG_ON(skb->end - skb->tail < grow);

		memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);

		skb->tail += grow;
		skb->data_len -= grow;

		skb_shinfo(skb)->frags[0].page_offset += grow;
		skb_shinfo(skb)->frags[0].size -= grow;

		if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
			put_page(skb_shinfo(skb)->frags[0].page);
			memmove(skb_shinfo(skb)->frags,
				skb_shinfo(skb)->frags + 1,
				--skb_shinfo(skb)->nr_frags);
		}
2668 2669
	}

2670
ok:
2671
	return ret;
2672 2673

normal:
2674 2675
	ret = GRO_NORMAL;
	goto pull;
H
Herbert Xu 已提交
2676
}
2677 2678
EXPORT_SYMBOL(dev_gro_receive);

2679 2680
static gro_result_t
__napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2681 2682 2683
{
	struct sk_buff *p;

2684 2685 2686
	if (netpoll_rx_on(skb))
		return GRO_NORMAL;

2687
	for (p = napi->gro_list; p; p = p->next) {
2688 2689 2690 2691
		NAPI_GRO_CB(p)->same_flow =
			(p->dev == skb->dev) &&
			!compare_ether_header(skb_mac_header(p),
					      skb_gro_mac_header(skb));
2692 2693 2694 2695 2696
		NAPI_GRO_CB(p)->flush = 0;
	}

	return dev_gro_receive(napi, skb);
}
H
Herbert Xu 已提交
2697

2698
gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
H
Herbert Xu 已提交
2699
{
2700 2701
	switch (ret) {
	case GRO_NORMAL:
2702 2703 2704
		if (netif_receive_skb(skb))
			ret = GRO_DROP;
		break;
H
Herbert Xu 已提交
2705

2706 2707
	case GRO_DROP:
	case GRO_MERGED_FREE:
H
Herbert Xu 已提交
2708 2709
		kfree_skb(skb);
		break;
2710 2711 2712 2713

	case GRO_HELD:
	case GRO_MERGED:
		break;
H
Herbert Xu 已提交
2714 2715
	}

2716
	return ret;
2717 2718 2719
}
EXPORT_SYMBOL(napi_skb_finish);

2720 2721 2722 2723
void skb_gro_reset_offset(struct sk_buff *skb)
{
	NAPI_GRO_CB(skb)->data_offset = 0;
	NAPI_GRO_CB(skb)->frag0 = NULL;
2724
	NAPI_GRO_CB(skb)->frag0_len = 0;
2725

2726
	if (skb->mac_header == skb->tail &&
2727
	    !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
2728 2729 2730
		NAPI_GRO_CB(skb)->frag0 =
			page_address(skb_shinfo(skb)->frags[0].page) +
			skb_shinfo(skb)->frags[0].page_offset;
2731 2732
		NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
	}
2733 2734 2735
}
EXPORT_SYMBOL(skb_gro_reset_offset);

2736
gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2737
{
2738 2739
	skb_gro_reset_offset(skb);

2740
	return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
2741 2742 2743
}
EXPORT_SYMBOL(napi_gro_receive);

2744 2745 2746 2747 2748 2749 2750 2751 2752
void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
{
	__skb_pull(skb, skb_headlen(skb));
	skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));

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

2753
struct sk_buff *napi_get_frags(struct napi_struct *napi)
H
Herbert Xu 已提交
2754 2755 2756 2757
{
	struct sk_buff *skb = napi->skb;

	if (!skb) {
2758 2759 2760
		skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
		if (skb)
			napi->skb = skb;
2761
	}
2762 2763
	return skb;
}
2764
EXPORT_SYMBOL(napi_get_frags);
2765

2766 2767
gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
			       gro_result_t ret)
2768
{
2769 2770
	switch (ret) {
	case GRO_NORMAL:
2771 2772 2773
	case GRO_HELD:
		skb->protocol = eth_type_trans(skb, napi->dev);

2774 2775 2776 2777
		if (ret == GRO_HELD)
			skb_gro_pull(skb, -ETH_HLEN);
		else if (netif_receive_skb(skb))
			ret = GRO_DROP;
2778
		break;
H
Herbert Xu 已提交
2779

2780 2781 2782 2783
	case GRO_DROP:
	case GRO_MERGED_FREE:
		napi_reuse_skb(napi, skb);
		break;
2784 2785 2786

	case GRO_MERGED:
		break;
2787
	}
H
Herbert Xu 已提交
2788

2789
	return ret;
H
Herbert Xu 已提交
2790
}
2791 2792
EXPORT_SYMBOL(napi_frags_finish);

2793 2794 2795 2796
struct sk_buff *napi_frags_skb(struct napi_struct *napi)
{
	struct sk_buff *skb = napi->skb;
	struct ethhdr *eth;
2797 2798
	unsigned int hlen;
	unsigned int off;
2799 2800 2801 2802 2803 2804

	napi->skb = NULL;

	skb_reset_mac_header(skb);
	skb_gro_reset_offset(skb);

2805 2806 2807 2808 2809 2810 2811 2812 2813 2814
	off = skb_gro_offset(skb);
	hlen = off + sizeof(*eth);
	eth = skb_gro_header_fast(skb, off);
	if (skb_gro_header_hard(skb, hlen)) {
		eth = skb_gro_header_slow(skb, hlen, off);
		if (unlikely(!eth)) {
			napi_reuse_skb(napi, skb);
			skb = NULL;
			goto out;
		}
2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829
	}

	skb_gro_pull(skb, sizeof(*eth));

	/*
	 * This works because the only protocols we care about don't require
	 * special handling.  We'll fix it up properly at the end.
	 */
	skb->protocol = eth->h_proto;

out:
	return skb;
}
EXPORT_SYMBOL(napi_frags_skb);

2830
gro_result_t napi_gro_frags(struct napi_struct *napi)
2831
{
2832
	struct sk_buff *skb = napi_frags_skb(napi);
2833 2834

	if (!skb)
2835
		return GRO_DROP;
2836 2837 2838

	return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
}
H
Herbert Xu 已提交
2839 2840
EXPORT_SYMBOL(napi_gro_frags);

2841
static int process_backlog(struct napi_struct *napi, int quota)
L
Linus Torvalds 已提交
2842 2843 2844 2845 2846
{
	int work = 0;
	struct softnet_data *queue = &__get_cpu_var(softnet_data);
	unsigned long start_time = jiffies;

2847 2848
	napi->weight = weight_p;
	do {
L
Linus Torvalds 已提交
2849 2850 2851 2852
		struct sk_buff *skb;

		local_irq_disable();
		skb = __skb_dequeue(&queue->input_pkt_queue);
2853
		if (!skb) {
2854
			__napi_complete(napi);
2855
			local_irq_enable();
2856
			break;
2857
		}
L
Linus Torvalds 已提交
2858 2859
		local_irq_enable();

2860
		netif_receive_skb(skb);
2861
	} while (++work < quota && jiffies == start_time);
L
Linus Torvalds 已提交
2862

2863 2864
	return work;
}
L
Linus Torvalds 已提交
2865

2866 2867
/**
 * __napi_schedule - schedule for receive
2868
 * @n: entry to schedule
2869 2870 2871
 *
 * The entry's receive function will be scheduled to run
 */
H
Harvey Harrison 已提交
2872
void __napi_schedule(struct napi_struct *n)
2873 2874
{
	unsigned long flags;
L
Linus Torvalds 已提交
2875

2876 2877 2878 2879
	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
2880
}
2881 2882
EXPORT_SYMBOL(__napi_schedule);

2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915
void __napi_complete(struct napi_struct *n)
{
	BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
	BUG_ON(n->gro_list);

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

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

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

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

void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight)
{
	INIT_LIST_HEAD(&napi->poll_list);
2916
	napi->gro_count = 0;
2917
	napi->gro_list = NULL;
H
Herbert Xu 已提交
2918
	napi->skb = NULL;
2919 2920 2921 2922
	napi->poll = poll;
	napi->weight = weight;
	list_add(&napi->dev_list, &dev->napi_list);
	napi->dev = dev;
H
Herbert Xu 已提交
2923
#ifdef CONFIG_NETPOLL
2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934
	spin_lock_init(&napi->poll_lock);
	napi->poll_owner = -1;
#endif
	set_bit(NAPI_STATE_SCHED, &napi->state);
}
EXPORT_SYMBOL(netif_napi_add);

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

2935
	list_del_init(&napi->dev_list);
2936
	napi_free_frags(napi);
2937 2938 2939 2940 2941 2942 2943 2944

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

	napi->gro_list = NULL;
2945
	napi->gro_count = 0;
2946 2947 2948
}
EXPORT_SYMBOL(netif_napi_del);

L
Linus Torvalds 已提交
2949 2950 2951

static void net_rx_action(struct softirq_action *h)
{
2952
	struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
2953
	unsigned long time_limit = jiffies + 2;
2954
	int budget = netdev_budget;
2955 2956
	void *have;

L
Linus Torvalds 已提交
2957 2958
	local_irq_disable();

2959 2960 2961
	while (!list_empty(list)) {
		struct napi_struct *n;
		int work, weight;
L
Linus Torvalds 已提交
2962

2963
		/* If softirq window is exhuasted then punt.
2964 2965
		 * Allow this to run for 2 jiffies since which will allow
		 * an average latency of 1.5/HZ.
2966
		 */
2967
		if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
L
Linus Torvalds 已提交
2968 2969 2970 2971
			goto softnet_break;

		local_irq_enable();

2972 2973 2974 2975 2976 2977
		/* Even though interrupts have been re-enabled, this
		 * access is safe because interrupts can only add new
		 * entries to the tail of this list, and only ->poll()
		 * calls can remove this head entry from the list.
		 */
		n = list_entry(list->next, struct napi_struct, poll_list);
L
Linus Torvalds 已提交
2978

2979 2980 2981 2982
		have = netpoll_poll_lock(n);

		weight = n->weight;

2983 2984 2985 2986 2987 2988 2989
		/* 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;
2990
		if (test_bit(NAPI_STATE_SCHED, &n->state)) {
2991
			work = n->poll(n, weight);
2992 2993
			trace_napi_poll(n);
		}
2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005

		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.
		 */
3006
		if (unlikely(work == weight)) {
3007 3008 3009 3010 3011
			if (unlikely(napi_disable_pending(n))) {
				local_irq_enable();
				napi_complete(n);
				local_irq_disable();
			} else
3012 3013
				list_move_tail(&n->poll_list, list);
		}
3014 3015

		netpoll_poll_unlock(have);
L
Linus Torvalds 已提交
3016 3017
	}
out:
3018
	local_irq_enable();
3019

3020 3021 3022 3023 3024
#ifdef CONFIG_NET_DMA
	/*
	 * There may not be any more sk_buffs coming right now, so push
	 * any pending DMA copies to hardware
	 */
3025
	dma_issue_pending_all();
3026
#endif
3027

L
Linus Torvalds 已提交
3028 3029 3030 3031 3032 3033 3034 3035
	return;

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

E
Eric Dumazet 已提交
3036
static gifconf_func_t *gifconf_list[NPROTO];
L
Linus Torvalds 已提交
3037 3038 3039 3040 3041 3042 3043 3044 3045 3046

/**
 *	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.
 */
E
Eric Dumazet 已提交
3047
int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
L
Linus Torvalds 已提交
3048 3049 3050 3051 3052 3053
{
	if (family >= NPROTO)
		return -EINVAL;
	gifconf_list[family] = gifconf;
	return 0;
}
E
Eric Dumazet 已提交
3054
EXPORT_SYMBOL(register_gifconf);
L
Linus Torvalds 已提交
3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067


/*
 *	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
 */

3068
static int dev_ifname(struct net *net, struct ifreq __user *arg)
L
Linus Torvalds 已提交
3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079
{
	struct net_device *dev;
	struct ifreq ifr;

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

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

3080 3081
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
L
Linus Torvalds 已提交
3082
	if (!dev) {
3083
		rcu_read_unlock();
L
Linus Torvalds 已提交
3084 3085 3086 3087
		return -ENODEV;
	}

	strcpy(ifr.ifr_name, dev->name);
3088
	rcu_read_unlock();
L
Linus Torvalds 已提交
3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100

	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'.
 */

3101
static int dev_ifconf(struct net *net, char __user *arg)
L
Linus Torvalds 已提交
3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124
{
	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;
3125
	for_each_netdev(net, dev) {
L
Linus Torvalds 已提交
3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138
		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;
			}
		}
3139
	}
L
Linus Torvalds 已提交
3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156

	/*
	 *	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.
 */
3157
void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3158
	__acquires(RCU)
L
Linus Torvalds 已提交
3159
{
3160
	struct net *net = seq_file_net(seq);
3161
	loff_t off;
L
Linus Torvalds 已提交
3162 3163
	struct net_device *dev;

3164
	rcu_read_lock();
3165 3166
	if (!*pos)
		return SEQ_START_TOKEN;
L
Linus Torvalds 已提交
3167

3168
	off = 1;
3169
	for_each_netdev_rcu(net, dev)
3170 3171
		if (off++ == *pos)
			return dev;
L
Linus Torvalds 已提交
3172

3173
	return NULL;
L
Linus Torvalds 已提交
3174 3175 3176 3177
}

void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
3178 3179 3180 3181
	struct net_device *dev = (v == SEQ_START_TOKEN) ?
				  first_net_device(seq_file_net(seq)) :
				  next_net_device((struct net_device *)v);

L
Linus Torvalds 已提交
3182
	++*pos;
3183
	return rcu_dereference(dev);
L
Linus Torvalds 已提交
3184 3185 3186
}

void dev_seq_stop(struct seq_file *seq, void *v)
3187
	__releases(RCU)
L
Linus Torvalds 已提交
3188
{
3189
	rcu_read_unlock();
L
Linus Torvalds 已提交
3190 3191 3192 3193
}

static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
3194
	const struct net_device_stats *stats = dev_get_stats(dev);
L
Linus Torvalds 已提交
3195

3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212
	seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
		   "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
		   dev->name, stats->rx_bytes, stats->rx_packets,
		   stats->rx_errors,
		   stats->rx_dropped + stats->rx_missed_errors,
		   stats->rx_fifo_errors,
		   stats->rx_length_errors + stats->rx_over_errors +
		    stats->rx_crc_errors + stats->rx_frame_errors,
		   stats->rx_compressed, stats->multicast,
		   stats->tx_bytes, stats->tx_packets,
		   stats->tx_errors, stats->tx_dropped,
		   stats->tx_fifo_errors, stats->collisions,
		   stats->tx_carrier_errors +
		    stats->tx_aborted_errors +
		    stats->tx_window_errors +
		    stats->tx_heartbeat_errors,
		   stats->tx_compressed);
L
Linus Torvalds 已提交
3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235
}

/*
 *	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;

3236
	while (*pos < nr_cpu_ids)
3237
		if (cpu_online(*pos)) {
L
Linus Torvalds 已提交
3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264
			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",
3265
		   s->total, s->dropped, s->time_squeeze, 0,
3266
		   0, 0, 0, 0, /* was fastroute */
E
Eric Dumazet 已提交
3267
		   s->cpu_collision);
L
Linus Torvalds 已提交
3268 3269 3270
	return 0;
}

3271
static const struct seq_operations dev_seq_ops = {
L
Linus Torvalds 已提交
3272 3273 3274 3275 3276 3277 3278 3279
	.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)
{
3280 3281
	return seq_open_net(inode, file, &dev_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
3282 3283
}

3284
static const struct file_operations dev_seq_fops = {
L
Linus Torvalds 已提交
3285 3286 3287 3288
	.owner	 = THIS_MODULE,
	.open    = dev_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
3289
	.release = seq_release_net,
L
Linus Torvalds 已提交
3290 3291
};

3292
static const struct seq_operations softnet_seq_ops = {
L
Linus Torvalds 已提交
3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303
	.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);
}

3304
static const struct file_operations softnet_seq_fops = {
L
Linus Torvalds 已提交
3305 3306 3307 3308 3309 3310 3311
	.owner	 = THIS_MODULE,
	.open    = softnet_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release,
};

3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323
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;
	}

3324
	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3325 3326 3327 3328 3329 3330 3331 3332 3333 3334
		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)
3335
	__acquires(RCU)
3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358
{
	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
3359
		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3360 3361

	while (nxt == &ptype_base[hash]) {
3362
		if (++hash >= PTYPE_HASH_SIZE)
3363 3364 3365 3366 3367 3368 3369 3370
			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)
3371
	__releases(RCU)
3372 3373 3374 3375 3376 3377 3378 3379 3380 3381
{
	rcu_read_unlock();
}

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

	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "Type Device      Function\n");
3382
	else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3383 3384 3385 3386 3387
		if (pt->type == htons(ETH_P_ALL))
			seq_puts(seq, "ALL ");
		else
			seq_printf(seq, "%04x", ntohs(pt->type));

A
Alexey Dobriyan 已提交
3388 3389
		seq_printf(seq, " %-8s %pF\n",
			   pt->dev ? pt->dev->name : "", pt->func);
3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403
	}

	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)
{
3404 3405
	return seq_open_net(inode, file, &ptype_seq_ops,
			sizeof(struct seq_net_private));
3406 3407 3408 3409 3410 3411 3412
}

static const struct file_operations ptype_seq_fops = {
	.owner	 = THIS_MODULE,
	.open    = ptype_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
3413
	.release = seq_release_net,
3414 3415 3416
};


3417
static int __net_init dev_proc_net_init(struct net *net)
L
Linus Torvalds 已提交
3418 3419 3420
{
	int rc = -ENOMEM;

3421
	if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
L
Linus Torvalds 已提交
3422
		goto out;
3423
	if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
L
Linus Torvalds 已提交
3424
		goto out_dev;
3425
	if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3426
		goto out_softnet;
3427

3428
	if (wext_proc_init(net))
3429
		goto out_ptype;
L
Linus Torvalds 已提交
3430 3431 3432
	rc = 0;
out:
	return rc;
3433
out_ptype:
3434
	proc_net_remove(net, "ptype");
L
Linus Torvalds 已提交
3435
out_softnet:
3436
	proc_net_remove(net, "softnet_stat");
L
Linus Torvalds 已提交
3437
out_dev:
3438
	proc_net_remove(net, "dev");
L
Linus Torvalds 已提交
3439 3440
	goto out;
}
3441

3442
static void __net_exit dev_proc_net_exit(struct net *net)
3443 3444 3445 3446 3447 3448 3449 3450
{
	wext_proc_exit(net);

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

3451
static struct pernet_operations __net_initdata dev_proc_ops = {
3452 3453 3454 3455 3456 3457 3458 3459
	.init = dev_proc_net_init,
	.exit = dev_proc_net_exit,
};

static int __init dev_proc_init(void)
{
	return register_pernet_subsys(&dev_proc_ops);
}
L
Linus Torvalds 已提交
3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488
#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;
3489

L
Linus Torvalds 已提交
3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502
	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;
}
E
Eric Dumazet 已提交
3503
EXPORT_SYMBOL(netdev_set_master);
L
Linus Torvalds 已提交
3504

3505 3506
static void dev_change_rx_flags(struct net_device *dev, int flags)
{
3507 3508 3509 3510
	const struct net_device_ops *ops = dev->netdev_ops;

	if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
		ops->ndo_change_rx_flags(dev, flags);
3511 3512
}

3513
static int __dev_set_promiscuity(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
3514 3515
{
	unsigned short old_flags = dev->flags;
3516 3517
	uid_t uid;
	gid_t gid;
L
Linus Torvalds 已提交
3518

3519 3520
	ASSERT_RTNL();

3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537
	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;
		}
	}
3538
	if (dev->flags != old_flags) {
L
Linus Torvalds 已提交
3539 3540
		printk(KERN_INFO "device %s %s promiscuous mode\n",
		       dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
3541
							       "left");
3542 3543
		if (audit_enabled) {
			current_uid_gid(&uid, &gid);
3544 3545 3546 3547 3548 3549
			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),
3550
				uid, gid,
3551
				audit_get_sessionid(current));
3552
		}
3553

3554
		dev_change_rx_flags(dev, IFF_PROMISC);
L
Linus Torvalds 已提交
3555
	}
3556
	return 0;
L
Linus Torvalds 已提交
3557 3558
}

3559 3560 3561 3562 3563 3564 3565 3566 3567
/**
 *	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.
3568
 *	Return 0 if successful or a negative errno code on error.
3569
 */
3570
int dev_set_promiscuity(struct net_device *dev, int inc)
3571 3572
{
	unsigned short old_flags = dev->flags;
3573
	int err;
3574

3575
	err = __dev_set_promiscuity(dev, inc);
3576
	if (err < 0)
3577
		return err;
3578 3579
	if (dev->flags != old_flags)
		dev_set_rx_mode(dev);
3580
	return err;
3581
}
E
Eric Dumazet 已提交
3582
EXPORT_SYMBOL(dev_set_promiscuity);
3583

L
Linus Torvalds 已提交
3584 3585 3586 3587 3588 3589 3590 3591 3592 3593
/**
 *	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.
3594
 *	Return 0 if successful or a negative errno code on error.
L
Linus Torvalds 已提交
3595 3596
 */

3597
int dev_set_allmulti(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
3598 3599 3600
{
	unsigned short old_flags = dev->flags;

3601 3602
	ASSERT_RTNL();

L
Linus Torvalds 已提交
3603
	dev->flags |= IFF_ALLMULTI;
3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619
	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;
		}
	}
3620
	if (dev->flags ^ old_flags) {
3621
		dev_change_rx_flags(dev, IFF_ALLMULTI);
3622
		dev_set_rx_mode(dev);
3623
	}
3624
	return 0;
3625
}
E
Eric Dumazet 已提交
3626
EXPORT_SYMBOL(dev_set_allmulti);
3627 3628 3629 3630

/*
 *	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
3631
 *	filtering it is put in promiscuous mode while unicast addresses
3632 3633 3634 3635
 *	are present.
 */
void __dev_set_rx_mode(struct net_device *dev)
{
3636 3637
	const struct net_device_ops *ops = dev->netdev_ops;

3638 3639 3640 3641 3642
	/* dev_open will call this function so the list will stay sane. */
	if (!(dev->flags&IFF_UP))
		return;

	if (!netif_device_present(dev))
3643
		return;
3644

3645 3646
	if (ops->ndo_set_rx_mode)
		ops->ndo_set_rx_mode(dev);
3647 3648 3649 3650
	else {
		/* Unicast addresses changes may only happen under the rtnl,
		 * therefore calling __dev_set_promiscuity here is safe.
		 */
3651
		if (dev->uc.count > 0 && !dev->uc_promisc) {
3652 3653
			__dev_set_promiscuity(dev, 1);
			dev->uc_promisc = 1;
3654
		} else if (dev->uc.count == 0 && dev->uc_promisc) {
3655 3656 3657 3658
			__dev_set_promiscuity(dev, -1);
			dev->uc_promisc = 0;
		}

3659 3660
		if (ops->ndo_set_multicast_list)
			ops->ndo_set_multicast_list(dev);
3661 3662 3663 3664 3665
	}
}

void dev_set_rx_mode(struct net_device *dev)
{
3666
	netif_addr_lock_bh(dev);
3667
	__dev_set_rx_mode(dev);
3668
	netif_addr_unlock_bh(dev);
L
Linus Torvalds 已提交
3669 3670
}

3671 3672
/* hw addresses list handling functions */

3673 3674
static int __hw_addr_add(struct netdev_hw_addr_list *list, unsigned char *addr,
			 int addr_len, unsigned char addr_type)
3675 3676 3677 3678 3679 3680 3681
{
	struct netdev_hw_addr *ha;
	int alloc_size;

	if (addr_len > MAX_ADDR_LEN)
		return -EINVAL;

3682
	list_for_each_entry(ha, &list->list, list) {
J
Jiri Pirko 已提交
3683 3684 3685 3686 3687 3688 3689 3690
		if (!memcmp(ha->addr, addr, addr_len) &&
		    ha->type == addr_type) {
			ha->refcount++;
			return 0;
		}
	}


3691 3692 3693 3694 3695 3696 3697 3698
	alloc_size = sizeof(*ha);
	if (alloc_size < L1_CACHE_BYTES)
		alloc_size = L1_CACHE_BYTES;
	ha = kmalloc(alloc_size, GFP_ATOMIC);
	if (!ha)
		return -ENOMEM;
	memcpy(ha->addr, addr, addr_len);
	ha->type = addr_type;
J
Jiri Pirko 已提交
3699 3700
	ha->refcount = 1;
	ha->synced = false;
3701 3702
	list_add_tail_rcu(&ha->list, &list->list);
	list->count++;
3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713
	return 0;
}

static void ha_rcu_free(struct rcu_head *head)
{
	struct netdev_hw_addr *ha;

	ha = container_of(head, struct netdev_hw_addr, rcu_head);
	kfree(ha);
}

3714 3715
static int __hw_addr_del(struct netdev_hw_addr_list *list, unsigned char *addr,
			 int addr_len, unsigned char addr_type)
3716 3717 3718
{
	struct netdev_hw_addr *ha;

3719
	list_for_each_entry(ha, &list->list, list) {
J
Jiri Pirko 已提交
3720
		if (!memcmp(ha->addr, addr, addr_len) &&
3721
		    (ha->type == addr_type || !addr_type)) {
J
Jiri Pirko 已提交
3722 3723
			if (--ha->refcount)
				return 0;
3724 3725
			list_del_rcu(&ha->list);
			call_rcu(&ha->rcu_head, ha_rcu_free);
3726
			list->count--;
3727 3728 3729 3730 3731 3732
			return 0;
		}
	}
	return -ENOENT;
}

3733 3734 3735
static int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list,
				  struct netdev_hw_addr_list *from_list,
				  int addr_len,
J
Jiri Pirko 已提交
3736
				  unsigned char addr_type)
3737 3738 3739 3740 3741
{
	int err;
	struct netdev_hw_addr *ha, *ha2;
	unsigned char type;

3742
	list_for_each_entry(ha, &from_list->list, list) {
3743
		type = addr_type ? addr_type : ha->type;
3744
		err = __hw_addr_add(to_list, ha->addr, addr_len, type);
3745 3746 3747 3748 3749 3750
		if (err)
			goto unroll;
	}
	return 0;

unroll:
3751
	list_for_each_entry(ha2, &from_list->list, list) {
3752 3753 3754
		if (ha2 == ha)
			break;
		type = addr_type ? addr_type : ha2->type;
3755
		__hw_addr_del(to_list, ha2->addr, addr_len, type);
3756 3757 3758 3759
	}
	return err;
}

3760 3761 3762
static void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list,
				   struct netdev_hw_addr_list *from_list,
				   int addr_len,
J
Jiri Pirko 已提交
3763
				   unsigned char addr_type)
3764 3765 3766 3767
{
	struct netdev_hw_addr *ha;
	unsigned char type;

3768
	list_for_each_entry(ha, &from_list->list, list) {
3769
		type = addr_type ? addr_type : ha->type;
3770
		__hw_addr_del(to_list, ha->addr, addr_len, addr_type);
J
Jiri Pirko 已提交
3771 3772 3773
	}
}

3774 3775
static int __hw_addr_sync(struct netdev_hw_addr_list *to_list,
			  struct netdev_hw_addr_list *from_list,
J
Jiri Pirko 已提交
3776 3777 3778 3779 3780
			  int addr_len)
{
	int err = 0;
	struct netdev_hw_addr *ha, *tmp;

3781
	list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
J
Jiri Pirko 已提交
3782
		if (!ha->synced) {
3783
			err = __hw_addr_add(to_list, ha->addr,
J
Jiri Pirko 已提交
3784 3785 3786 3787 3788 3789
					    addr_len, ha->type);
			if (err)
				break;
			ha->synced = true;
			ha->refcount++;
		} else if (ha->refcount == 1) {
3790 3791
			__hw_addr_del(to_list, ha->addr, addr_len, ha->type);
			__hw_addr_del(from_list, ha->addr, addr_len, ha->type);
J
Jiri Pirko 已提交
3792
		}
3793
	}
J
Jiri Pirko 已提交
3794
	return err;
3795 3796
}

3797 3798
static void __hw_addr_unsync(struct netdev_hw_addr_list *to_list,
			     struct netdev_hw_addr_list *from_list,
J
Jiri Pirko 已提交
3799 3800 3801 3802
			     int addr_len)
{
	struct netdev_hw_addr *ha, *tmp;

3803
	list_for_each_entry_safe(ha, tmp, &from_list->list, list) {
J
Jiri Pirko 已提交
3804
		if (ha->synced) {
3805
			__hw_addr_del(to_list, ha->addr,
J
Jiri Pirko 已提交
3806 3807
				      addr_len, ha->type);
			ha->synced = false;
3808
			__hw_addr_del(from_list, ha->addr,
J
Jiri Pirko 已提交
3809 3810 3811 3812 3813
				      addr_len, ha->type);
		}
	}
}

3814
static void __hw_addr_flush(struct netdev_hw_addr_list *list)
3815 3816 3817
{
	struct netdev_hw_addr *ha, *tmp;

3818
	list_for_each_entry_safe(ha, tmp, &list->list, list) {
3819 3820 3821
		list_del_rcu(&ha->list);
		call_rcu(&ha->rcu_head, ha_rcu_free);
	}
3822 3823 3824 3825 3826 3827 3828
	list->count = 0;
}

static void __hw_addr_init(struct netdev_hw_addr_list *list)
{
	INIT_LIST_HEAD(&list->list);
	list->count = 0;
3829 3830 3831 3832 3833 3834 3835 3836
}

/* Device addresses handling functions */

static void dev_addr_flush(struct net_device *dev)
{
	/* rtnl_mutex must be held here */

3837
	__hw_addr_flush(&dev->dev_addrs);
3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848
	dev->dev_addr = NULL;
}

static int dev_addr_init(struct net_device *dev)
{
	unsigned char addr[MAX_ADDR_LEN];
	struct netdev_hw_addr *ha;
	int err;

	/* rtnl_mutex must be held here */

3849
	__hw_addr_init(&dev->dev_addrs);
E
Eric Dumazet 已提交
3850
	memset(addr, 0, sizeof(addr));
3851
	err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr),
3852 3853 3854 3855 3856 3857
			    NETDEV_HW_ADDR_T_LAN);
	if (!err) {
		/*
		 * Get the first (previously created) address from the list
		 * and set dev_addr pointer to this location.
		 */
3858
		ha = list_first_entry(&dev->dev_addrs.list,
3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882
				      struct netdev_hw_addr, list);
		dev->dev_addr = ha->addr;
	}
	return err;
}

/**
 *	dev_addr_add	- Add a device address
 *	@dev: device
 *	@addr: address to add
 *	@addr_type: address type
 *
 *	Add a device address to the device or increase the reference count if
 *	it already exists.
 *
 *	The caller must hold the rtnl_mutex.
 */
int dev_addr_add(struct net_device *dev, unsigned char *addr,
		 unsigned char addr_type)
{
	int err;

	ASSERT_RTNL();

3883
	err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type);
3884 3885 3886 3887 3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904
	if (!err)
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
	return err;
}
EXPORT_SYMBOL(dev_addr_add);

/**
 *	dev_addr_del	- Release a device address.
 *	@dev: device
 *	@addr: address to delete
 *	@addr_type: address type
 *
 *	Release reference to a device address and remove it from the device
 *	if the reference count drops to zero.
 *
 *	The caller must hold the rtnl_mutex.
 */
int dev_addr_del(struct net_device *dev, unsigned char *addr,
		 unsigned char addr_type)
{
	int err;
J
Jiri Pirko 已提交
3905
	struct netdev_hw_addr *ha;
3906 3907 3908

	ASSERT_RTNL();

J
Jiri Pirko 已提交
3909 3910 3911 3912
	/*
	 * We can not remove the first address from the list because
	 * dev->dev_addr points to that.
	 */
3913 3914
	ha = list_first_entry(&dev->dev_addrs.list,
			      struct netdev_hw_addr, list);
J
Jiri Pirko 已提交
3915 3916 3917
	if (ha->addr == dev->dev_addr && ha->refcount == 1)
		return -ENOENT;

3918
	err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len,
J
Jiri Pirko 已提交
3919
			    addr_type);
3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945
	if (!err)
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
	return err;
}
EXPORT_SYMBOL(dev_addr_del);

/**
 *	dev_addr_add_multiple	- Add device addresses from another device
 *	@to_dev: device to which addresses will be added
 *	@from_dev: device from which addresses will be added
 *	@addr_type: address type - 0 means type will be used from from_dev
 *
 *	Add device addresses of the one device to another.
 **
 *	The caller must hold the rtnl_mutex.
 */
int dev_addr_add_multiple(struct net_device *to_dev,
			  struct net_device *from_dev,
			  unsigned char addr_type)
{
	int err;

	ASSERT_RTNL();

	if (from_dev->addr_len != to_dev->addr_len)
		return -EINVAL;
3946
	err = __hw_addr_add_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs,
J
Jiri Pirko 已提交
3947
				     to_dev->addr_len, addr_type);
3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970 3971
	if (!err)
		call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
	return err;
}
EXPORT_SYMBOL(dev_addr_add_multiple);

/**
 *	dev_addr_del_multiple	- Delete device addresses by another device
 *	@to_dev: device where the addresses will be deleted
 *	@from_dev: device by which addresses the addresses will be deleted
 *	@addr_type: address type - 0 means type will used from from_dev
 *
 *	Deletes addresses in to device by the list of addresses in from device.
 *
 *	The caller must hold the rtnl_mutex.
 */
int dev_addr_del_multiple(struct net_device *to_dev,
			  struct net_device *from_dev,
			  unsigned char addr_type)
{
	ASSERT_RTNL();

	if (from_dev->addr_len != to_dev->addr_len)
		return -EINVAL;
3972
	__hw_addr_del_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs,
J
Jiri Pirko 已提交
3973
			       to_dev->addr_len, addr_type);
3974 3975 3976 3977 3978
	call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
	return 0;
}
EXPORT_SYMBOL(dev_addr_del_multiple);

3979
/* multicast addresses handling functions */
3980

3981 3982
int __dev_addr_delete(struct dev_addr_list **list, int *count,
		      void *addr, int alen, int glbl)
3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999
{
	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);
4000
			(*count)--;
4001 4002 4003 4004 4005 4006
			return 0;
		}
	}
	return -ENOENT;
}

4007 4008
int __dev_addr_add(struct dev_addr_list **list, int *count,
		   void *addr, int alen, int glbl)
4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025
{
	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;
		}
	}

4026
	da = kzalloc(sizeof(*da), GFP_ATOMIC);
4027 4028 4029 4030 4031 4032 4033 4034
	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;
4035
	(*count)++;
4036 4037 4038
	return 0;
}

4039 4040 4041
/**
 *	dev_unicast_delete	- Release secondary unicast address.
 *	@dev: device
R
Randy Dunlap 已提交
4042
 *	@addr: address to delete
4043 4044
 *
 *	Release reference to a secondary unicast address and remove it
R
Randy Dunlap 已提交
4045
 *	from the device if the reference count drops to zero.
4046 4047 4048
 *
 * 	The caller must hold the rtnl_mutex.
 */
J
Jiri Pirko 已提交
4049
int dev_unicast_delete(struct net_device *dev, void *addr)
4050 4051 4052 4053 4054
{
	int err;

	ASSERT_RTNL();

4055
	netif_addr_lock_bh(dev);
4056 4057
	err = __hw_addr_del(&dev->uc, addr, dev->addr_len,
			    NETDEV_HW_ADDR_T_UNICAST);
4058
	if (!err)
4059
		__dev_set_rx_mode(dev);
4060
	netif_addr_unlock_bh(dev);
4061 4062 4063 4064 4065 4066 4067
	return err;
}
EXPORT_SYMBOL(dev_unicast_delete);

/**
 *	dev_unicast_add		- add a secondary unicast address
 *	@dev: device
4068
 *	@addr: address to add
4069 4070 4071 4072 4073 4074
 *
 *	Add a secondary unicast address to the device or increase
 *	the reference count if it already exists.
 *
 *	The caller must hold the rtnl_mutex.
 */
J
Jiri Pirko 已提交
4075
int dev_unicast_add(struct net_device *dev, void *addr)
4076 4077 4078 4079 4080
{
	int err;

	ASSERT_RTNL();

4081
	netif_addr_lock_bh(dev);
4082 4083
	err = __hw_addr_add(&dev->uc, addr, dev->addr_len,
			    NETDEV_HW_ADDR_T_UNICAST);
4084
	if (!err)
4085
		__dev_set_rx_mode(dev);
4086
	netif_addr_unlock_bh(dev);
4087 4088 4089 4090
	return err;
}
EXPORT_SYMBOL(dev_unicast_add);

4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116
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;
}
4117
EXPORT_SYMBOL_GPL(__dev_addr_sync);
4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136

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;
	}
}
4137
EXPORT_SYMBOL_GPL(__dev_addr_unsync);
4138 4139 4140 4141 4142 4143 4144

/**
 *	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
4145 4146
 *	addresses that have no users left. The source device must be
 *	locked by netif_tx_lock_bh.
4147 4148 4149 4150 4151 4152 4153 4154
 *
 *	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;

J
Jiri Pirko 已提交
4155 4156 4157
	if (to->addr_len != from->addr_len)
		return -EINVAL;

4158
	netif_addr_lock_bh(to);
4159
	err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len);
4160 4161
	if (!err)
		__dev_set_rx_mode(to);
4162
	netif_addr_unlock_bh(to);
4163 4164 4165 4166 4167
	return err;
}
EXPORT_SYMBOL(dev_unicast_sync);

/**
4168
 *	dev_unicast_unsync - Remove synchronized addresses from the destination device
4169 4170 4171 4172 4173 4174 4175 4176 4177
 *	@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)
{
J
Jiri Pirko 已提交
4178 4179
	if (to->addr_len != from->addr_len)
		return;
4180

4181 4182
	netif_addr_lock_bh(from);
	netif_addr_lock(to);
4183
	__hw_addr_unsync(&to->uc, &from->uc, to->addr_len);
J
Jiri Pirko 已提交
4184
	__dev_set_rx_mode(to);
4185 4186
	netif_addr_unlock(to);
	netif_addr_unlock_bh(from);
4187 4188 4189
}
EXPORT_SYMBOL(dev_unicast_unsync);

J
Jiri Pirko 已提交
4190 4191
static void dev_unicast_flush(struct net_device *dev)
{
4192
	netif_addr_lock_bh(dev);
4193
	__hw_addr_flush(&dev->uc);
4194
	netif_addr_unlock_bh(dev);
J
Jiri Pirko 已提交
4195 4196 4197 4198
}

static void dev_unicast_init(struct net_device *dev)
{
4199
	__hw_addr_init(&dev->uc);
J
Jiri Pirko 已提交
4200 4201 4202
}


4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216
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);
	}
}

4217
static void dev_addr_discard(struct net_device *dev)
4218
{
4219
	netif_addr_lock_bh(dev);
4220

4221 4222
	__dev_addr_discard(&dev->mc_list);
	dev->mc_count = 0;
4223

4224
	netif_addr_unlock_bh(dev);
4225 4226
}

4227 4228 4229 4230 4231 4232
/**
 *	dev_get_flags - get flags reported to userspace
 *	@dev: device
 *
 *	Get the combination of flag bits exported through APIs to userspace.
 */
L
Linus Torvalds 已提交
4233 4234 4235 4236 4237 4238
unsigned dev_get_flags(const struct net_device *dev)
{
	unsigned flags;

	flags = (dev->flags & ~(IFF_PROMISC |
				IFF_ALLMULTI |
S
Stefan Rompf 已提交
4239 4240 4241
				IFF_RUNNING |
				IFF_LOWER_UP |
				IFF_DORMANT)) |
L
Linus Torvalds 已提交
4242 4243 4244
		(dev->gflags & (IFF_PROMISC |
				IFF_ALLMULTI));

S
Stefan Rompf 已提交
4245 4246 4247 4248 4249 4250 4251 4252
	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
4253 4254 4255

	return flags;
}
E
Eric Dumazet 已提交
4256
EXPORT_SYMBOL(dev_get_flags);
L
Linus Torvalds 已提交
4257

4258 4259 4260 4261 4262 4263 4264 4265
/**
 *	dev_change_flags - change device settings
 *	@dev: device
 *	@flags: device state flags
 *
 *	Change settings on device based state flags. The flags are
 *	in the userspace exported format.
 */
L
Linus Torvalds 已提交
4266 4267
int dev_change_flags(struct net_device *dev, unsigned flags)
{
4268
	int ret, changes;
L
Linus Torvalds 已提交
4269 4270
	int old_flags = dev->flags;

4271 4272
	ASSERT_RTNL();

L
Linus Torvalds 已提交
4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286
	/*
	 *	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.
	 */

4287 4288
	if ((old_flags ^ flags) & IFF_MULTICAST)
		dev_change_rx_flags(dev, IFF_MULTICAST);
4289

4290
	dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302

	/*
	 *	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)
4303
			dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
4304 4305 4306
	}

	if (dev->flags & IFF_UP &&
E
Eric Dumazet 已提交
4307
	    ((old_flags ^ dev->flags) & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
L
Linus Torvalds 已提交
4308
					  IFF_VOLATILE)))
4309
		call_netdevice_notifiers(NETDEV_CHANGE, dev);
L
Linus Torvalds 已提交
4310 4311

	if ((flags ^ dev->gflags) & IFF_PROMISC) {
E
Eric Dumazet 已提交
4312 4313
		int inc = (flags & IFF_PROMISC) ? 1 : -1;

L
Linus Torvalds 已提交
4314 4315 4316 4317 4318 4319 4320 4321 4322
		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) {
E
Eric Dumazet 已提交
4323 4324
		int inc = (flags & IFF_ALLMULTI) ? 1 : -1;

L
Linus Torvalds 已提交
4325 4326 4327 4328
		dev->gflags ^= IFF_ALLMULTI;
		dev_set_allmulti(dev, inc);
	}

4329 4330 4331 4332
	/* 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
4333 4334 4335

	return ret;
}
E
Eric Dumazet 已提交
4336
EXPORT_SYMBOL(dev_change_flags);
L
Linus Torvalds 已提交
4337

4338 4339 4340 4341 4342 4343 4344
/**
 *	dev_set_mtu - Change maximum transfer unit
 *	@dev: device
 *	@new_mtu: new transfer unit
 *
 *	Change the maximum transfer size of the network device.
 */
L
Linus Torvalds 已提交
4345 4346
int dev_set_mtu(struct net_device *dev, int new_mtu)
{
4347
	const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360
	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;
4361 4362
	if (ops->ndo_change_mtu)
		err = ops->ndo_change_mtu(dev, new_mtu);
L
Linus Torvalds 已提交
4363 4364
	else
		dev->mtu = new_mtu;
4365

L
Linus Torvalds 已提交
4366
	if (!err && dev->flags & IFF_UP)
4367
		call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
L
Linus Torvalds 已提交
4368 4369
	return err;
}
E
Eric Dumazet 已提交
4370
EXPORT_SYMBOL(dev_set_mtu);
L
Linus Torvalds 已提交
4371

4372 4373 4374 4375 4376 4377 4378
/**
 *	dev_set_mac_address - Change Media Access Control Address
 *	@dev: device
 *	@sa: new address
 *
 *	Change the hardware (MAC) address of the device
 */
L
Linus Torvalds 已提交
4379 4380
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
{
4381
	const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
4382 4383
	int err;

4384
	if (!ops->ndo_set_mac_address)
L
Linus Torvalds 已提交
4385 4386 4387 4388 4389
		return -EOPNOTSUPP;
	if (sa->sa_family != dev->type)
		return -EINVAL;
	if (!netif_device_present(dev))
		return -ENODEV;
4390
	err = ops->ndo_set_mac_address(dev, sa);
L
Linus Torvalds 已提交
4391
	if (!err)
4392
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
L
Linus Torvalds 已提交
4393 4394
	return err;
}
E
Eric Dumazet 已提交
4395
EXPORT_SYMBOL(dev_set_mac_address);
L
Linus Torvalds 已提交
4396 4397

/*
E
Eric Dumazet 已提交
4398
 *	Perform the SIOCxIFxxx calls, inside rcu_read_lock()
L
Linus Torvalds 已提交
4399
 */
4400
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
L
Linus Torvalds 已提交
4401 4402
{
	int err;
E
Eric Dumazet 已提交
4403
	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
L
Linus Torvalds 已提交
4404 4405 4406 4407 4408

	if (!dev)
		return -ENODEV;

	switch (cmd) {
E
Eric Dumazet 已提交
4409 4410 4411
	case SIOCGIFFLAGS:	/* Get interface flags */
		ifr->ifr_flags = (short) dev_get_flags(dev);
		return 0;
L
Linus Torvalds 已提交
4412

E
Eric Dumazet 已提交
4413 4414 4415 4416
	case SIOCGIFMETRIC:	/* Get the metric on the interface
				   (currently unused) */
		ifr->ifr_metric = 0;
		return 0;
L
Linus Torvalds 已提交
4417

E
Eric Dumazet 已提交
4418 4419 4420
	case SIOCGIFMTU:	/* Get the MTU of a device */
		ifr->ifr_mtu = dev->mtu;
		return 0;
L
Linus Torvalds 已提交
4421

E
Eric Dumazet 已提交
4422 4423 4424 4425 4426 4427 4428 4429
	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;
L
Linus Torvalds 已提交
4430

E
Eric Dumazet 已提交
4431 4432 4433
	case SIOCGIFSLAVE:
		err = -EINVAL;
		break;
4434

E
Eric Dumazet 已提交
4435 4436 4437 4438 4439 4440 4441 4442
	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;
4443

E
Eric Dumazet 已提交
4444 4445 4446
	case SIOCGIFINDEX:
		ifr->ifr_ifindex = dev->ifindex;
		return 0;
4447

E
Eric Dumazet 已提交
4448 4449 4450
	case SIOCGIFTXQLEN:
		ifr->ifr_qlen = dev->tx_queue_len;
		return 0;
4451

E
Eric Dumazet 已提交
4452 4453 4454 4455 4456 4457 4458
	default:
		/* dev_ioctl() should ensure this case
		 * is never reached
		 */
		WARN_ON(1);
		err = -EINVAL;
		break;
4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470

	}
	return err;
}

/*
 *	Perform the SIOCxIFxxx calls, inside rtnl_lock()
 */
static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
{
	int err;
	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
J
Jarek Poplawski 已提交
4471
	const struct net_device_ops *ops;
4472 4473 4474 4475

	if (!dev)
		return -ENODEV;

J
Jarek Poplawski 已提交
4476 4477
	ops = dev->netdev_ops;

4478
	switch (cmd) {
E
Eric Dumazet 已提交
4479 4480
	case SIOCSIFFLAGS:	/* Set interface flags */
		return dev_change_flags(dev, ifr->ifr_flags);
4481

E
Eric Dumazet 已提交
4482 4483 4484
	case SIOCSIFMETRIC:	/* Set the metric on the interface
				   (currently unused) */
		return -EOPNOTSUPP;
4485

E
Eric Dumazet 已提交
4486 4487
	case SIOCSIFMTU:	/* Set the MTU of a device */
		return dev_set_mtu(dev, ifr->ifr_mtu);
L
Linus Torvalds 已提交
4488

E
Eric Dumazet 已提交
4489 4490
	case SIOCSIFHWADDR:
		return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
L
Linus Torvalds 已提交
4491

E
Eric Dumazet 已提交
4492 4493 4494 4495 4496 4497 4498
	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));
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
		return 0;
L
Linus Torvalds 已提交
4499

E
Eric Dumazet 已提交
4500 4501
	case SIOCSIFMAP:
		if (ops->ndo_set_config) {
L
Linus Torvalds 已提交
4502 4503
			if (!netif_device_present(dev))
				return -ENODEV;
E
Eric Dumazet 已提交
4504 4505 4506
			return ops->ndo_set_config(dev, &ifr->ifr_map);
		}
		return -EOPNOTSUPP;
L
Linus Torvalds 已提交
4507

E
Eric Dumazet 已提交
4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524
	case SIOCADDMULTI:
		if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
		    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:
		if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
		    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);
L
Linus Torvalds 已提交
4525

E
Eric Dumazet 已提交
4526 4527 4528 4529 4530
	case SIOCSIFTXQLEN:
		if (ifr->ifr_qlen < 0)
			return -EINVAL;
		dev->tx_queue_len = ifr->ifr_qlen;
		return 0;
L
Linus Torvalds 已提交
4531

E
Eric Dumazet 已提交
4532 4533 4534
	case SIOCSIFNAME:
		ifr->ifr_newname[IFNAMSIZ-1] = '\0';
		return dev_change_name(dev, ifr->ifr_newname);
L
Linus Torvalds 已提交
4535

E
Eric Dumazet 已提交
4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563
	/*
	 *	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 == SIOCSHWTSTAMP ||
		    cmd == SIOCWANDEV) {
			err = -EOPNOTSUPP;
			if (ops->ndo_do_ioctl) {
				if (netif_device_present(dev))
					err = ops->ndo_do_ioctl(dev, ifr, cmd);
				else
					err = -ENODEV;
			}
		} else
			err = -EINVAL;
L
Linus Torvalds 已提交
4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575

	}
	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
4576
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
4577 4578 4579 4580 4581 4582 4583 4584 4585
 *	@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.
 */

4586
int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
L
Linus Torvalds 已提交
4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597
{
	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) {
4598
		rtnl_lock();
4599
		ret = dev_ifconf(net, (char __user *) arg);
4600
		rtnl_unlock();
L
Linus Torvalds 已提交
4601 4602 4603
		return ret;
	}
	if (cmd == SIOCGIFNAME)
4604
		return dev_ifname(net, (struct ifreq __user *)arg);
L
Linus Torvalds 已提交
4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619

	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) {
E
Eric Dumazet 已提交
4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634
	/*
	 *	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:
		dev_load(net, ifr.ifr_name);
E
Eric Dumazet 已提交
4635
		rcu_read_lock();
E
Eric Dumazet 已提交
4636
		ret = dev_ifsioc_locked(net, &ifr, cmd);
E
Eric Dumazet 已提交
4637
		rcu_read_unlock();
E
Eric Dumazet 已提交
4638 4639 4640 4641 4642 4643 4644 4645
		if (!ret) {
			if (colon)
				*colon = ':';
			if (copy_to_user(arg, &ifr,
					 sizeof(struct ifreq)))
				ret = -EFAULT;
		}
		return ret;
L
Linus Torvalds 已提交
4646

E
Eric Dumazet 已提交
4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659
	case SIOCETHTOOL:
		dev_load(net, ifr.ifr_name);
		rtnl_lock();
		ret = dev_ethtool(net, &ifr);
		rtnl_unlock();
		if (!ret) {
			if (colon)
				*colon = ':';
			if (copy_to_user(arg, &ifr,
					 sizeof(struct ifreq)))
				ret = -EFAULT;
		}
		return ret;
L
Linus Torvalds 已提交
4660

E
Eric Dumazet 已提交
4661 4662 4663 4664 4665 4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683
	/*
	 *	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;
		dev_load(net, ifr.ifr_name);
		rtnl_lock();
		ret = dev_ifsioc(net, &ifr, cmd);
		rtnl_unlock();
		if (!ret) {
			if (colon)
				*colon = ':';
			if (copy_to_user(arg, &ifr,
					 sizeof(struct ifreq)))
				ret = -EFAULT;
		}
		return ret;
L
Linus Torvalds 已提交
4684

E
Eric Dumazet 已提交
4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735
	/*
	 *	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:
	case SIOCSHWTSTAMP:
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		/* fall through */
	case SIOCBONDSLAVEINFOQUERY:
	case SIOCBONDINFOQUERY:
		dev_load(net, ifr.ifr_name);
		rtnl_lock();
		ret = dev_ifsioc(net, &ifr, cmd);
		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)) {
4736
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
4737
			rtnl_lock();
4738
			ret = dev_ifsioc(net, &ifr, cmd);
L
Linus Torvalds 已提交
4739
			rtnl_unlock();
E
Eric Dumazet 已提交
4740 4741 4742
			if (!ret && copy_to_user(arg, &ifr,
						 sizeof(struct ifreq)))
				ret = -EFAULT;
L
Linus Torvalds 已提交
4743
			return ret;
E
Eric Dumazet 已提交
4744 4745 4746 4747 4748
		}
		/* Take care of Wireless Extensions */
		if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
			return wext_handle_ioctl(net, &ifr, cmd, arg);
		return -EINVAL;
L
Linus Torvalds 已提交
4749 4750 4751 4752 4753 4754
	}
}


/**
 *	dev_new_index	-	allocate an ifindex
4755
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
4756 4757 4758 4759 4760
 *
 *	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.
 */
4761
static int dev_new_index(struct net *net)
L
Linus Torvalds 已提交
4762 4763 4764 4765 4766
{
	static int ifindex;
	for (;;) {
		if (++ifindex <= 0)
			ifindex = 1;
4767
		if (!__dev_get_by_index(net, ifindex))
L
Linus Torvalds 已提交
4768 4769 4770 4771 4772
			return ifindex;
	}
}

/* Delayed registration/unregisteration */
4773
static LIST_HEAD(net_todo_list);
L
Linus Torvalds 已提交
4774

4775
static void net_set_todo(struct net_device *dev)
L
Linus Torvalds 已提交
4776 4777 4778 4779
{
	list_add_tail(&dev->todo_list, &net_todo_list);
}

4780
static void rollback_registered_many(struct list_head *head)
4781
{
4782
	struct net_device *dev, *tmp;
4783

4784 4785 4786
	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

4787
	list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4788
		/* Some devices call without registering
4789 4790
		 * for initialization unwind. Remove those
		 * devices and proceed with the remaining.
4791 4792 4793 4794
		 */
		if (dev->reg_state == NETREG_UNINITIALIZED) {
			pr_debug("unregister_netdevice: device %s/%p never "
				 "was registered\n", dev->name, dev);
4795

4796
			WARN_ON(1);
4797 4798
			list_del(&dev->unreg_list);
			continue;
4799
		}
4800

4801
		BUG_ON(dev->reg_state != NETREG_REGISTERED);
4802

4803 4804
		/* If device is running, close it first. */
		dev_close(dev);
4805

4806 4807
		/* And unlink it from device chain. */
		unlist_netdevice(dev);
4808

4809 4810
		dev->reg_state = NETREG_UNREGISTERING;
	}
4811 4812 4813

	synchronize_net();

4814 4815 4816
	list_for_each_entry(dev, head, unreg_list) {
		/* Shutdown queueing discipline. */
		dev_shutdown(dev);
4817 4818


4819 4820 4821 4822
		/* Notify protocols, that we are about to destroy
		   this device. They should clean all the things.
		*/
		call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4823

4824 4825 4826 4827 4828
		/*
		 *	Flush the unicast and multicast chains
		 */
		dev_unicast_flush(dev);
		dev_addr_discard(dev);
4829

4830 4831
		if (dev->netdev_ops->ndo_uninit)
			dev->netdev_ops->ndo_uninit(dev);
4832

4833 4834
		/* Notifier chain MUST detach us from master device. */
		WARN_ON(dev->master);
4835

4836 4837 4838
		/* Remove entries from kobject tree */
		netdev_unregister_kobject(dev);
	}
4839

4840 4841 4842
	/* Process any work delayed until the end of the batch */
	dev = list_entry(head->next, struct net_device, unreg_list);
	call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4843

4844
	synchronize_net();
4845

4846
	list_for_each_entry(dev, head, unreg_list)
4847 4848 4849 4850 4851 4852 4853 4854 4855
		dev_put(dev);
}

static void rollback_registered(struct net_device *dev)
{
	LIST_HEAD(single);

	list_add(&dev->unreg_list, &single);
	rollback_registered_many(&single);
4856 4857
}

4858 4859 4860
static void __netdev_init_queue_locks_one(struct net_device *dev,
					  struct netdev_queue *dev_queue,
					  void *_unused)
4861 4862
{
	spin_lock_init(&dev_queue->_xmit_lock);
4863
	netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4864 4865 4866 4867 4868
	dev_queue->xmit_lock_owner = -1;
}

static void netdev_init_queue_locks(struct net_device *dev)
{
4869 4870
	netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
	__netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4871 4872
}

4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893 4894 4895 4896 4897 4898 4899 4900 4901 4902 4903 4904 4905 4906 4907 4908 4909 4910 4911 4912
unsigned long netdev_fix_features(unsigned long features, const char *name)
{
	/* Fix illegal SG+CSUM combinations. */
	if ((features & NETIF_F_SG) &&
	    !(features & NETIF_F_ALL_CSUM)) {
		if (name)
			printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
			       "checksum feature.\n", name);
		features &= ~NETIF_F_SG;
	}

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

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

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

	return features;
}
EXPORT_SYMBOL(netdev_fix_features);

4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939
/**
 *	netif_stacked_transfer_operstate -	transfer operstate
 *	@rootdev: the root or lower level device to transfer state from
 *	@dev: the device to transfer operstate to
 *
 *	Transfer operational state from root to device. This is normally
 *	called when a stacking relationship exists between the root
 *	device and the device(a leaf device).
 */
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev)
{
	if (rootdev->operstate == IF_OPER_DORMANT)
		netif_dormant_on(dev);
	else
		netif_dormant_off(dev);

	if (netif_carrier_ok(rootdev)) {
		if (!netif_carrier_ok(dev))
			netif_carrier_on(dev);
	} else {
		if (netif_carrier_ok(dev))
			netif_carrier_off(dev);
	}
}
EXPORT_SYMBOL(netif_stacked_transfer_operstate);

L
Linus Torvalds 已提交
4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959
/**
 *	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)
{
	int ret;
4960
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
4961 4962 4963 4964

	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

4965 4966
	might_sleep();

L
Linus Torvalds 已提交
4967 4968
	/* When net_device's are persistent, this will be fatal. */
	BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4969
	BUG_ON(!net);
L
Linus Torvalds 已提交
4970

4971
	spin_lock_init(&dev->addr_list_lock);
4972
	netdev_set_addr_lockdep_class(dev);
4973
	netdev_init_queue_locks(dev);
L
Linus Torvalds 已提交
4974 4975 4976 4977

	dev->iflink = -1;

	/* Init, if this function is available */
4978 4979
	if (dev->netdev_ops->ndo_init) {
		ret = dev->netdev_ops->ndo_init(dev);
L
Linus Torvalds 已提交
4980 4981 4982
		if (ret) {
			if (ret > 0)
				ret = -EIO;
4983
			goto out;
L
Linus Torvalds 已提交
4984 4985
		}
	}
4986

4987 4988
	ret = dev_get_valid_name(net, dev->name, dev->name, 0);
	if (ret)
4989
		goto err_uninit;
L
Linus Torvalds 已提交
4990

4991
	dev->ifindex = dev_new_index(net);
L
Linus Torvalds 已提交
4992 4993 4994
	if (dev->iflink == -1)
		dev->iflink = dev->ifindex;

4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009
	/* 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);
	}

5010
	dev->features = netdev_fix_features(dev->features, dev->name);
L
Linus Torvalds 已提交
5011

5012 5013 5014 5015
	/* Enable software GSO if SG is supported. */
	if (dev->features & NETIF_F_SG)
		dev->features |= NETIF_F_GSO;

5016
	netdev_initialize_kobject(dev);
5017 5018 5019 5020 5021 5022

	ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		goto err_uninit;

5023
	ret = netdev_register_kobject(dev);
5024
	if (ret)
5025
		goto err_uninit;
5026 5027
	dev->reg_state = NETREG_REGISTERED;

L
Linus Torvalds 已提交
5028 5029 5030 5031 5032 5033 5034 5035 5036
	/*
	 *	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);
5037
	list_netdevice(dev);
L
Linus Torvalds 已提交
5038 5039

	/* Notify protocols, that a new device appeared. */
5040
	ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5041
	ret = notifier_to_errno(ret);
5042 5043 5044 5045
	if (ret) {
		rollback_registered(dev);
		dev->reg_state = NETREG_UNREGISTERED;
	}
5046 5047 5048 5049 5050
	/*
	 *	Prevent userspace races by waiting until the network
	 *	device is fully setup before sending notifications.
	 */
	rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
L
Linus Torvalds 已提交
5051 5052 5053

out:
	return ret;
5054 5055

err_uninit:
5056 5057
	if (dev->netdev_ops->ndo_uninit)
		dev->netdev_ops->ndo_uninit(dev);
5058
	goto out;
L
Linus Torvalds 已提交
5059
}
E
Eric Dumazet 已提交
5060
EXPORT_SYMBOL(register_netdevice);
L
Linus Torvalds 已提交
5061

5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100
/**
 *	init_dummy_netdev	- init a dummy network device for NAPI
 *	@dev: device to init
 *
 *	This takes a network device structure and initialize the minimum
 *	amount of fields so it can be used to schedule NAPI polls without
 *	registering a full blown interface. This is to be used by drivers
 *	that need to tie several hardware interfaces to a single NAPI
 *	poll scheduler due to HW limitations.
 */
int init_dummy_netdev(struct net_device *dev)
{
	/* Clear everything. Note we don't initialize spinlocks
	 * are they aren't supposed to be taken by any of the
	 * NAPI code and this dummy netdev is supposed to be
	 * only ever used for NAPI polls
	 */
	memset(dev, 0, sizeof(struct net_device));

	/* make sure we BUG if trying to hit standard
	 * register/unregister code path
	 */
	dev->reg_state = NETREG_DUMMY;

	/* initialize the ref count */
	atomic_set(&dev->refcnt, 1);

	/* NAPI wants this */
	INIT_LIST_HEAD(&dev->napi_list);

	/* a dummy interface is started by default */
	set_bit(__LINK_STATE_PRESENT, &dev->state);
	set_bit(__LINK_STATE_START, &dev->state);

	return 0;
}
EXPORT_SYMBOL_GPL(init_dummy_netdev);


L
Linus Torvalds 已提交
5101 5102 5103 5104 5105 5106 5107 5108 5109
/**
 *	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.
 *
5110
 *	This is a wrapper around register_netdevice that takes the rtnl semaphore
L
Linus Torvalds 已提交
5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128
 *	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;
	}
5129

L
Linus Torvalds 已提交
5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145
	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
5146
 * call dev_put.
L
Linus Torvalds 已提交
5147 5148 5149 5150 5151
 */
static void netdev_wait_allrefs(struct net_device *dev)
{
	unsigned long rebroadcast_time, warning_time;

5152 5153
	linkwatch_forget_dev(dev);

L
Linus Torvalds 已提交
5154 5155 5156
	rebroadcast_time = warning_time = jiffies;
	while (atomic_read(&dev->refcnt) != 0) {
		if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5157
			rtnl_lock();
L
Linus Torvalds 已提交
5158 5159

			/* Rebroadcast unregister notification */
5160
			call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5161
			/* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5162
			 * should have already handle it the first time */
L
Linus Torvalds 已提交
5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174

			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();
			}

5175
			__rtnl_unlock();
L
Linus Torvalds 已提交
5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205

			rebroadcast_time = jiffies;
		}

		msleep(250);

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

/* The sequence is:
 *
 *	rtnl_lock();
 *	...
 *	register_netdevice(x1);
 *	register_netdevice(x2);
 *	...
 *	unregister_netdevice(y1);
 *	unregister_netdevice(y2);
 *      ...
 *	rtnl_unlock();
 *	free_netdev(y1);
 *	free_netdev(y2);
 *
H
Herbert Xu 已提交
5206
 * We are invoked by rtnl_unlock().
L
Linus Torvalds 已提交
5207
 * This allows us to deal with problems:
5208
 * 1) We can delete sysfs objects which invoke hotplug
L
Linus Torvalds 已提交
5209 5210 5211
 *    without deadlocking with linkwatch via keventd.
 * 2) Since we run with the RTNL semaphore not held, we can sleep
 *    safely in order to wait for the netdev refcnt to drop to zero.
H
Herbert Xu 已提交
5212 5213 5214
 *
 * We must not return until all unregister events added during
 * the interval the lock was held have been completed.
L
Linus Torvalds 已提交
5215 5216 5217
 */
void netdev_run_todo(void)
{
5218
	struct list_head list;
L
Linus Torvalds 已提交
5219 5220

	/* Snapshot list, allow later requests */
5221
	list_replace_init(&net_todo_list, &list);
H
Herbert Xu 已提交
5222 5223

	__rtnl_unlock();
5224

L
Linus Torvalds 已提交
5225 5226 5227 5228 5229
	while (!list_empty(&list)) {
		struct net_device *dev
			= list_entry(list.next, struct net_device, todo_list);
		list_del(&dev->todo_list);

5230 5231 5232 5233 5234 5235
		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
5236

5237
		dev->reg_state = NETREG_UNREGISTERED;
L
Linus Torvalds 已提交
5238

5239 5240
		on_each_cpu(flush_backlog, dev, 1);

5241
		netdev_wait_allrefs(dev);
L
Linus Torvalds 已提交
5242

5243 5244
		/* paranoia */
		BUG_ON(atomic_read(&dev->refcnt));
5245 5246 5247
		WARN_ON(dev->ip_ptr);
		WARN_ON(dev->ip6_ptr);
		WARN_ON(dev->dn_ptr);
L
Linus Torvalds 已提交
5248

5249 5250
		if (dev->destructor)
			dev->destructor(dev);
5251 5252 5253

		/* Free network device */
		kobject_put(&dev->dev.kobj);
L
Linus Torvalds 已提交
5254 5255 5256
	}
}

5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 5268 5269 5270 5271 5272 5273 5274 5275 5276 5277 5278 5279 5280 5281 5282
/**
 *	dev_txq_stats_fold - fold tx_queues stats
 *	@dev: device to get statistics from
 *	@stats: struct net_device_stats to hold results
 */
void dev_txq_stats_fold(const struct net_device *dev,
			struct net_device_stats *stats)
{
	unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
	unsigned int i;
	struct netdev_queue *txq;

	for (i = 0; i < dev->num_tx_queues; i++) {
		txq = netdev_get_tx_queue(dev, i);
		tx_bytes   += txq->tx_bytes;
		tx_packets += txq->tx_packets;
		tx_dropped += txq->tx_dropped;
	}
	if (tx_bytes || tx_packets || tx_dropped) {
		stats->tx_bytes   = tx_bytes;
		stats->tx_packets = tx_packets;
		stats->tx_dropped = tx_dropped;
	}
}
EXPORT_SYMBOL(dev_txq_stats_fold);

5283 5284 5285 5286 5287 5288 5289 5290 5291
/**
 *	dev_get_stats	- get network device statistics
 *	@dev: device to get statistics from
 *
 *	Get network statistics from device. The device driver may provide
 *	its own method by setting dev->netdev_ops->get_stats; otherwise
 *	the internal statistics structure is used.
 */
const struct net_device_stats *dev_get_stats(struct net_device *dev)
5292
{
5293 5294 5295 5296
	const struct net_device_ops *ops = dev->netdev_ops;

	if (ops->ndo_get_stats)
		return ops->ndo_get_stats(dev);
5297 5298 5299

	dev_txq_stats_fold(dev, &dev->stats);
	return &dev->stats;
R
Rusty Russell 已提交
5300
}
5301
EXPORT_SYMBOL(dev_get_stats);
R
Rusty Russell 已提交
5302

5303
static void netdev_init_one_queue(struct net_device *dev,
5304 5305
				  struct netdev_queue *queue,
				  void *_unused)
5306 5307 5308 5309
{
	queue->dev = dev;
}

5310 5311
static void netdev_init_queues(struct net_device *dev)
{
5312 5313
	netdev_init_one_queue(dev, &dev->rx_queue, NULL);
	netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5314
	spin_lock_init(&dev->tx_global_lock);
5315 5316
}

L
Linus Torvalds 已提交
5317
/**
5318
 *	alloc_netdev_mq - allocate network device
L
Linus Torvalds 已提交
5319 5320 5321
 *	@sizeof_priv:	size of private data to allocate space for
 *	@name:		device name format string
 *	@setup:		callback to initialize device
5322
 *	@queue_count:	the number of subqueues to allocate
L
Linus Torvalds 已提交
5323 5324
 *
 *	Allocates a struct net_device with private data area for driver use
5325 5326
 *	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
5327
 */
5328 5329
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
5330
{
5331
	struct netdev_queue *tx;
L
Linus Torvalds 已提交
5332
	struct net_device *dev;
5333
	size_t alloc_size;
5334
	struct net_device *p;
L
Linus Torvalds 已提交
5335

5336 5337
	BUG_ON(strlen(name) >= sizeof(dev->name));

5338
	alloc_size = sizeof(struct net_device);
5339 5340
	if (sizeof_priv) {
		/* ensure 32-byte alignment of private area */
5341
		alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5342 5343 5344
		alloc_size += sizeof_priv;
	}
	/* ensure 32-byte alignment of whole construct */
5345
	alloc_size += NETDEV_ALIGN - 1;
L
Linus Torvalds 已提交
5346

5347
	p = kzalloc(alloc_size, GFP_KERNEL);
L
Linus Torvalds 已提交
5348
	if (!p) {
5349
		printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
L
Linus Torvalds 已提交
5350 5351 5352
		return NULL;
	}

5353
	tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5354 5355 5356
	if (!tx) {
		printk(KERN_ERR "alloc_netdev: Unable to allocate "
		       "tx qdiscs.\n");
5357
		goto free_p;
5358 5359
	}

5360
	dev = PTR_ALIGN(p, NETDEV_ALIGN);
L
Linus Torvalds 已提交
5361
	dev->padded = (char *)dev - (char *)p;
5362 5363 5364 5365

	if (dev_addr_init(dev))
		goto free_tx;

J
Jiri Pirko 已提交
5366 5367
	dev_unicast_init(dev);

5368
	dev_net_set(dev, &init_net);
L
Linus Torvalds 已提交
5369

5370 5371
	dev->_tx = tx;
	dev->num_tx_queues = queue_count;
5372
	dev->real_num_tx_queues = queue_count;
5373

5374
	dev->gso_max_size = GSO_MAX_SIZE;
L
Linus Torvalds 已提交
5375

5376 5377
	netdev_init_queues(dev);

5378
	INIT_LIST_HEAD(&dev->napi_list);
5379
	INIT_LIST_HEAD(&dev->unreg_list);
5380
	INIT_LIST_HEAD(&dev->link_watch_list);
5381
	dev->priv_flags = IFF_XMIT_DST_RELEASE;
L
Linus Torvalds 已提交
5382 5383 5384
	setup(dev);
	strcpy(dev->name, name);
	return dev;
5385 5386 5387 5388 5389 5390 5391

free_tx:
	kfree(tx);

free_p:
	kfree(p);
	return NULL;
L
Linus Torvalds 已提交
5392
}
5393
EXPORT_SYMBOL(alloc_netdev_mq);
L
Linus Torvalds 已提交
5394 5395 5396 5397 5398

/**
 *	free_netdev - free network device
 *	@dev: device
 *
5399 5400
 *	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
5401 5402 5403 5404
 *	If this is the last reference then it will be freed.
 */
void free_netdev(struct net_device *dev)
{
5405 5406
	struct napi_struct *p, *n;

5407 5408
	release_net(dev_net(dev));

5409 5410
	kfree(dev->_tx);

5411 5412 5413
	/* Flush device addresses */
	dev_addr_flush(dev);

5414 5415 5416
	list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
		netif_napi_del(p);

S
Stephen Hemminger 已提交
5417
	/*  Compatibility with error handling in drivers */
L
Linus Torvalds 已提交
5418 5419 5420 5421 5422 5423 5424 5425
	if (dev->reg_state == NETREG_UNINITIALIZED) {
		kfree((char *)dev - dev->padded);
		return;
	}

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

5426 5427
	/* will free via device release */
	put_device(&dev->dev);
L
Linus Torvalds 已提交
5428
}
E
Eric Dumazet 已提交
5429
EXPORT_SYMBOL(free_netdev);
5430

5431 5432 5433 5434 5435 5436
/**
 *	synchronize_net -  Synchronize with packet receive processing
 *
 *	Wait for packets currently being received to be done.
 *	Does not block later packets from starting.
 */
5437
void synchronize_net(void)
L
Linus Torvalds 已提交
5438 5439
{
	might_sleep();
5440
	synchronize_rcu();
L
Linus Torvalds 已提交
5441
}
E
Eric Dumazet 已提交
5442
EXPORT_SYMBOL(synchronize_net);
L
Linus Torvalds 已提交
5443 5444

/**
5445
 *	unregister_netdevice_queue - remove device from the kernel
L
Linus Torvalds 已提交
5446
 *	@dev: device
5447
 *	@head: list
5448
 *
L
Linus Torvalds 已提交
5449
 *	This function shuts down a device interface and removes it
5450
 *	from the kernel tables.
5451
 *	If head not NULL, device is queued to be unregistered later.
L
Linus Torvalds 已提交
5452 5453 5454 5455 5456
 *
 *	Callers must hold the rtnl semaphore.  You may want
 *	unregister_netdev() instead of this.
 */

5457
void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
L
Linus Torvalds 已提交
5458
{
5459 5460
	ASSERT_RTNL();

5461
	if (head) {
5462
		list_move_tail(&dev->unreg_list, head);
5463 5464 5465 5466 5467
	} else {
		rollback_registered(dev);
		/* Finish processing unregister after unlock */
		net_set_todo(dev);
	}
L
Linus Torvalds 已提交
5468
}
5469
EXPORT_SYMBOL(unregister_netdevice_queue);
L
Linus Torvalds 已提交
5470

5471 5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484
/**
 *	unregister_netdevice_many - unregister many devices
 *	@head: list of devices
 */
void unregister_netdevice_many(struct list_head *head)
{
	struct net_device *dev;

	if (!list_empty(head)) {
		rollback_registered_many(head);
		list_for_each_entry(dev, head, unreg_list)
			net_set_todo(dev);
	}
}
5485
EXPORT_SYMBOL(unregister_netdevice_many);
5486

L
Linus Torvalds 已提交
5487 5488 5489 5490 5491
/**
 *	unregister_netdev - remove device from the kernel
 *	@dev: device
 *
 *	This function shuts down a device interface and removes it
5492
 *	from the kernel tables.
L
Linus Torvalds 已提交
5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505
 *
 *	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);

5506 5507 5508 5509 5510 5511 5512 5513 5514 5515 5516 5517 5518 5519 5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530
/**
 *	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)
{
	int err;

	ASSERT_RTNL();

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

5531 5532 5533 5534 5535 5536 5537 5538 5539
#ifdef CONFIG_SYSFS
	/* Don't allow real devices to be moved when sysfs
	 * is enabled.
	 */
	err = -EINVAL;
	if (dev->dev.parent)
		goto out;
#endif

5540 5541 5542 5543 5544 5545 5546
	/* 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;
5547
	if (net_eq(dev_net(dev), net))
5548 5549 5550 5551 5552 5553
		goto out;

	/* Pick the destination device name, and ensure
	 * we can use it in the destination network namespace.
	 */
	err = -EEXIST;
5554
	if (__dev_get_by_name(net, dev->name)) {
5555 5556 5557
		/* We get here if we can't use the current device name */
		if (!pat)
			goto out;
5558
		if (dev_get_valid_name(net, pat, dev->name, 1))
5559 5560 5561 5562 5563 5564 5565 5566
			goto out;
	}

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

	/* If device is running close it first. */
5567
	dev_close(dev);
5568 5569 5570 5571 5572 5573 5574 5575 5576 5577 5578 5579 5580 5581

	/* 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);
5582
	call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5583 5584 5585 5586

	/*
	 *	Flush the unicast and multicast chains
	 */
J
Jiri Pirko 已提交
5587
	dev_unicast_flush(dev);
5588 5589
	dev_addr_discard(dev);

5590 5591
	netdev_unregister_kobject(dev);

5592
	/* Actually switch the network namespace */
5593
	dev_net_set(dev, net);
5594 5595 5596 5597 5598 5599 5600 5601 5602

	/* 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;
	}

5603
	/* Fixup kobjects */
5604
	err = netdev_register_kobject(dev);
5605
	WARN_ON(err);
5606 5607 5608 5609 5610 5611 5612

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

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

5613 5614 5615 5616 5617 5618
	/*
	 *	Prevent userspace races by waiting until the network
	 *	device is fully setup before sending notifications.
	 */
	rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);

5619 5620 5621 5622 5623
	synchronize_net();
	err = 0;
out:
	return err;
}
5624
EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5625

L
Linus Torvalds 已提交
5626 5627 5628 5629 5630
static int dev_cpu_callback(struct notifier_block *nfb,
			    unsigned long action,
			    void *ocpu)
{
	struct sk_buff **list_skb;
5631
	struct Qdisc **list_net;
L
Linus Torvalds 已提交
5632 5633 5634 5635
	struct sk_buff *skb;
	unsigned int cpu, oldcpu = (unsigned long)ocpu;
	struct softnet_data *sd, *oldsd;

5636
	if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
L
Linus Torvalds 已提交
5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664 5665 5666 5667 5668 5669 5670
		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;
}


5671
/**
5672 5673 5674 5675
 *	netdev_increment_features - increment feature set by one
 *	@all: current feature set
 *	@one: new feature set
 *	@mask: mask feature set
5676 5677
 *
 *	Computes a new feature set after adding a device with feature set
5678 5679
 *	@one to the master device with current feature set @all.  Will not
 *	enable anything that is off in @mask. Returns the new feature set.
5680
 */
5681 5682 5683 5684
unsigned long netdev_increment_features(unsigned long all, unsigned long one,
					unsigned long mask)
{
	/* If device needs checksumming, downgrade to it. */
E
Eric Dumazet 已提交
5685
	if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5686 5687 5688 5689 5690 5691 5692 5693
		all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
	else if (mask & NETIF_F_ALL_CSUM) {
		/* If one device supports v4/v6 checksumming, set for all. */
		if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
		    !(all & NETIF_F_GEN_CSUM)) {
			all &= ~NETIF_F_ALL_CSUM;
			all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
		}
5694

5695 5696 5697 5698 5699 5700
		/* If one device supports hw checksumming, set for all. */
		if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
			all &= ~NETIF_F_ALL_CSUM;
			all |= NETIF_F_HW_CSUM;
		}
	}
5701

5702
	one |= NETIF_F_ALL_CSUM;
5703

5704
	one |= all & NETIF_F_ONE_FOR_ALL;
5705
	all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5706
	all |= one & mask & NETIF_F_ONE_FOR_ALL;
5707 5708 5709

	return all;
}
5710
EXPORT_SYMBOL(netdev_increment_features);
5711

5712 5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724
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;
}

5725
/* Initialize per network namespace state */
5726
static int __net_init netdev_init(struct net *net)
5727 5728 5729
{
	INIT_LIST_HEAD(&net->dev_base_head);

5730 5731 5732
	net->dev_name_head = netdev_create_hash();
	if (net->dev_name_head == NULL)
		goto err_name;
5733

5734 5735 5736
	net->dev_index_head = netdev_create_hash();
	if (net->dev_index_head == NULL)
		goto err_idx;
5737 5738

	return 0;
5739 5740 5741 5742 5743

err_idx:
	kfree(net->dev_name_head);
err_name:
	return -ENOMEM;
5744 5745
}

5746 5747 5748 5749 5750 5751 5752 5753
/**
 *	netdev_drivername - network driver for the device
 *	@dev: network device
 *	@buffer: buffer for resulting name
 *	@len: size of buffer
 *
 *	Determine network driver for device.
 */
5754
char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5755
{
5756 5757
	const struct device_driver *driver;
	const struct device *parent;
5758 5759 5760 5761 5762 5763 5764 5765 5766 5767 5768 5769 5770 5771 5772 5773

	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;
}

5774
static void __net_exit netdev_exit(struct net *net)
5775 5776 5777 5778 5779
{
	kfree(net->dev_name_head);
	kfree(net->dev_index_head);
}

5780
static struct pernet_operations __net_initdata netdev_net_ops = {
5781 5782 5783 5784
	.init = netdev_init,
	.exit = netdev_exit,
};

5785
static void __net_exit default_device_exit(struct net *net)
5786
{
5787
	struct net_device *dev, *aux;
5788
	/*
5789
	 * Push all migratable network devices back to the
5790 5791 5792
	 * initial network namespace
	 */
	rtnl_lock();
5793
	for_each_netdev_safe(net, dev, aux) {
5794
		int err;
5795
		char fb_name[IFNAMSIZ];
5796 5797 5798 5799 5800

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

5801 5802 5803
		/* Leave virtual devices for the generic cleanup */
		if (dev->rtnl_link_ops)
			continue;
5804

5805
		/* Push remaing network devices to init_net */
5806 5807
		snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
		err = dev_change_net_namespace(dev, &init_net, fb_name);
5808
		if (err) {
5809
			printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5810
				__func__, dev->name, err);
5811
			BUG();
5812 5813 5814 5815 5816
		}
	}
	rtnl_unlock();
}

5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840
static void __net_exit default_device_exit_batch(struct list_head *net_list)
{
	/* At exit all network devices most be removed from a network
	 * namespace.  Do this in the reverse order of registeration.
	 * Do this across as many network namespaces as possible to
	 * improve batching efficiency.
	 */
	struct net_device *dev;
	struct net *net;
	LIST_HEAD(dev_kill_list);

	rtnl_lock();
	list_for_each_entry(net, net_list, exit_list) {
		for_each_netdev_reverse(net, dev) {
			if (dev->rtnl_link_ops)
				dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
			else
				unregister_netdevice_queue(dev, &dev_kill_list);
		}
	}
	unregister_netdevice_many(&dev_kill_list);
	rtnl_unlock();
}

5841
static struct pernet_operations __net_initdata default_device_ops = {
5842
	.exit = default_device_exit,
5843
	.exit_batch = default_device_exit_batch,
5844 5845
};

L
Linus Torvalds 已提交
5846 5847 5848 5849 5850 5851 5852 5853 5854 5855 5856 5857 5858 5859 5860 5861 5862 5863 5864 5865
/*
 *	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;

5866
	if (netdev_kobject_init())
L
Linus Torvalds 已提交
5867 5868 5869
		goto out;

	INIT_LIST_HEAD(&ptype_all);
5870
	for (i = 0; i < PTYPE_HASH_SIZE; i++)
L
Linus Torvalds 已提交
5871 5872
		INIT_LIST_HEAD(&ptype_base[i]);

5873 5874
	if (register_pernet_subsys(&netdev_net_ops))
		goto out;
L
Linus Torvalds 已提交
5875 5876 5877 5878 5879

	/*
	 *	Initialise the packet receive queues.
	 */

5880
	for_each_possible_cpu(i) {
L
Linus Torvalds 已提交
5881 5882 5883 5884 5885 5886
		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);
5887 5888 5889

		queue->backlog.poll = process_backlog;
		queue->backlog.weight = weight_p;
5890
		queue->backlog.gro_list = NULL;
5891
		queue->backlog.gro_count = 0;
L
Linus Torvalds 已提交
5892 5893 5894 5895
	}

	dev_boot_phase = 0;

5896 5897 5898 5899 5900 5901 5902 5903 5904 5905 5906 5907 5908 5909 5910
	/* The loopback device is special if any other network devices
	 * is present in a network namespace the loopback device must
	 * be present. Since we now dynamically allocate and free the
	 * loopback device ensure this invariant is maintained by
	 * keeping the loopback device as the first device on the
	 * list of network devices.  Ensuring the loopback devices
	 * is the first device that appears and the last network device
	 * that disappears.
	 */
	if (register_pernet_device(&loopback_net_ops))
		goto out;

	if (register_pernet_device(&default_device_ops))
		goto out;

5911 5912
	open_softirq(NET_TX_SOFTIRQ, net_tx_action);
	open_softirq(NET_RX_SOFTIRQ, net_rx_action);
L
Linus Torvalds 已提交
5913 5914 5915 5916 5917 5918 5919 5920 5921 5922 5923

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

subsys_initcall(net_dev_init);

5924 5925 5926 5927 5928 5929 5930 5931
static int __init initialize_hashrnd(void)
{
	get_random_bytes(&skb_tx_hashrnd, sizeof(skb_tx_hashrnd));
	return 0;
}

late_initcall_sync(initialize_hashrnd);