dev.c 149.7 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/slab.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 <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 <linux/pci.h>
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#include <linux/inetdevice.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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static inline void rps_lock(struct softnet_data *sd)
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{
#ifdef CONFIG_RPS
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	spin_lock(&sd->input_pkt_queue.lock);
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#endif
}

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static inline void rps_unlock(struct softnet_data *sd)
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{
#ifdef CONFIG_RPS
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	spin_unlock(&sd->input_pkt_queue.lock);
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#endif
}

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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_ALIGNED(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)
 */

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static inline struct list_head *ptype_head(const struct packet_type *pt)
{
	if (pt->type == htons(ETH_P_ALL))
		return &ptype_all;
	else
		return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
}

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/**
 *	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)
{
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	struct list_head *head = ptype_head(pt);
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	spin_lock(&ptype_lock);
	list_add_rcu(&pt->list, head);
	spin_unlock(&ptype_lock);
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}
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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)
{
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	struct list_head *head = ptype_head(pt);
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	struct packet_type *pt1;

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	spin_lock(&ptype_lock);
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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:
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	spin_unlock(&ptype_lock);
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}
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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
	 */
546
	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
592
 *	@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.
 */

602
struct net_device *__dev_get_by_name(struct net *net, const char *name)
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{
	struct hlist_node *p;
E
Eric Dumazet 已提交
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	struct net_device *dev;
	struct hlist_head *head = dev_name_hash(net, name);
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607

E
Eric Dumazet 已提交
608
	hlist_for_each_entry(dev, p, head, name_hlist)
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		if (!strncmp(dev->name, name, IFNAMSIZ))
			return dev;
E
Eric Dumazet 已提交
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L
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	return NULL;
}
E
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614
EXPORT_SYMBOL(__dev_get_by_name);
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616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641
/**
 *	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);

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/**
 *	dev_get_by_name		- find a device by its name
644
 *	@net: the applicable net namespace
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 *	@name: name to find
 *
 *	Find an interface by name. This can be called from any
 *	context and does its own locking. The returned handle has
 *	the usage count incremented and the caller must use dev_put() to
 *	release it when it is no longer needed. %NULL is returned if no
 *	matching device is found.
 */

654
struct net_device *dev_get_by_name(struct net *net, const char *name)
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{
	struct net_device *dev;

658 659
	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
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	if (dev)
		dev_hold(dev);
662
	rcu_read_unlock();
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663 664
	return dev;
}
E
Eric Dumazet 已提交
665
EXPORT_SYMBOL(dev_get_by_name);
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666 667 668

/**
 *	__dev_get_by_index - find a device by its ifindex
669
 *	@net: the applicable net namespace
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 *	@ifindex: index of device
 *
 *	Search for an interface by index. Returns %NULL if the device
 *	is not found or a pointer to the device. The device has not
 *	had its reference counter increased so the caller must be careful
 *	about locking. The caller must hold either the RTNL semaphore
 *	or @dev_base_lock.
 */

679
struct net_device *__dev_get_by_index(struct net *net, int ifindex)
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{
	struct hlist_node *p;
E
Eric Dumazet 已提交
682 683
	struct net_device *dev;
	struct hlist_head *head = dev_index_hash(net, ifindex);
L
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684

E
Eric Dumazet 已提交
685
	hlist_for_each_entry(dev, p, head, index_hlist)
L
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686 687
		if (dev->ifindex == ifindex)
			return dev;
E
Eric Dumazet 已提交
688

L
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689 690
	return NULL;
}
E
Eric Dumazet 已提交
691
EXPORT_SYMBOL(__dev_get_by_index);
L
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692

693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717
/**
 *	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);

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718 719 720

/**
 *	dev_get_by_index - find a device by its ifindex
721
 *	@net: the applicable net namespace
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722 723 724 725 726 727 728 729
 *	@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.
 */

730
struct net_device *dev_get_by_index(struct net *net, int ifindex)
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731 732 733
{
	struct net_device *dev;

734 735
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifindex);
L
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736 737
	if (dev)
		dev_hold(dev);
738
	rcu_read_unlock();
L
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739 740
	return dev;
}
E
Eric Dumazet 已提交
741
EXPORT_SYMBOL(dev_get_by_index);
L
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742 743 744

/**
 *	dev_getbyhwaddr - find a device by its hardware address
745
 *	@net: the applicable net namespace
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746 747 748 749 750 751 752 753 754 755 756 757
 *	@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
 */

758
struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
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759 760 761 762 763
{
	struct net_device *dev;

	ASSERT_RTNL();

764
	for_each_netdev(net, dev)
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765 766
		if (dev->type == type &&
		    !memcmp(dev->dev_addr, ha, dev->addr_len))
767 768 769
			return dev;

	return NULL;
L
Linus Torvalds 已提交
770
}
771 772
EXPORT_SYMBOL(dev_getbyhwaddr);

773
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
L
Linus Torvalds 已提交
774 775 776
{
	struct net_device *dev;

777
	ASSERT_RTNL();
778
	for_each_netdev(net, dev)
779
		if (dev->type == type)
780 781 782
			return dev;

	return NULL;
783 784 785
}
EXPORT_SYMBOL(__dev_getfirstbyhwtype);

786
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
787
{
788
	struct net_device *dev, *ret = NULL;
789

790 791 792 793 794 795 796 797 798
	rcu_read_lock();
	for_each_netdev_rcu(net, dev)
		if (dev->type == type) {
			dev_hold(dev);
			ret = dev;
			break;
		}
	rcu_read_unlock();
	return ret;
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799 800 801 802
}
EXPORT_SYMBOL(dev_getfirstbyhwtype);

/**
E
Eric Dumazet 已提交
803
 *	dev_get_by_flags_rcu - find any device with given flags
804
 *	@net: the applicable net namespace
L
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805 806 807 808
 *	@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
E
Eric Dumazet 已提交
809 810
 *	is not found or a pointer to the device. Must be called inside
 *	rcu_read_lock(), and result refcount is unchanged.
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Linus Torvalds 已提交
811 812
 */

E
Eric Dumazet 已提交
813
struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
E
Eric Dumazet 已提交
814
				    unsigned short mask)
L
Linus Torvalds 已提交
815
{
816
	struct net_device *dev, *ret;
L
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817

818
	ret = NULL;
819
	for_each_netdev_rcu(net, dev) {
L
Linus Torvalds 已提交
820
		if (((dev->flags ^ if_flags) & mask) == 0) {
821
			ret = dev;
L
Linus Torvalds 已提交
822 823 824
			break;
		}
	}
825
	return ret;
L
Linus Torvalds 已提交
826
}
E
Eric Dumazet 已提交
827
EXPORT_SYMBOL(dev_get_by_flags_rcu);
L
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828 829 830 831 832 833

/**
 *	dev_valid_name - check if name is okay for network device
 *	@name: name string
 *
 *	Network device names need to be valid file names to
834 835
 *	to allow sysfs to work.  We also disallow any kind of
 *	whitespace.
L
Linus Torvalds 已提交
836
 */
837
int dev_valid_name(const char *name)
L
Linus Torvalds 已提交
838
{
839 840
	if (*name == '\0')
		return 0;
841 842
	if (strlen(name) >= IFNAMSIZ)
		return 0;
843 844 845 846 847 848 849 850 851
	if (!strcmp(name, ".") || !strcmp(name, ".."))
		return 0;

	while (*name) {
		if (*name == '/' || isspace(*name))
			return 0;
		name++;
	}
	return 1;
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852
}
E
Eric Dumazet 已提交
853
EXPORT_SYMBOL(dev_valid_name);
L
Linus Torvalds 已提交
854 855

/**
856 857
 *	__dev_alloc_name - allocate a name for a device
 *	@net: network namespace to allocate the device name in
L
Linus Torvalds 已提交
858
 *	@name: name format string
859
 *	@buf:  scratch buffer and result name string
L
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860 861
 *
 *	Passed a format string - eg "lt%d" it will try and find a suitable
S
Stephen Hemminger 已提交
862 863 864 865 866 867
 *	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
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868 869
 */

870
static int __dev_alloc_name(struct net *net, const char *name, char *buf)
L
Linus Torvalds 已提交
871 872 873 874
{
	int i = 0;
	const char *p;
	const int max_netdevices = 8*PAGE_SIZE;
S
Stephen Hemminger 已提交
875
	unsigned long *inuse;
L
Linus Torvalds 已提交
876 877 878 879 880 881 882 883 884 885 886 887 888
	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
889
		inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
L
Linus Torvalds 已提交
890 891 892
		if (!inuse)
			return -ENOMEM;

893
		for_each_netdev(net, d) {
L
Linus Torvalds 已提交
894 895 896 897 898 899
			if (!sscanf(d->name, name, &i))
				continue;
			if (i < 0 || i >= max_netdevices)
				continue;

			/*  avoid cases where sscanf is not exact inverse of printf */
900
			snprintf(buf, IFNAMSIZ, name, i);
L
Linus Torvalds 已提交
901 902 903 904 905 906 907 908
			if (!strncmp(buf, d->name, IFNAMSIZ))
				set_bit(i, inuse);
		}

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

909 910
	if (buf != name)
		snprintf(buf, IFNAMSIZ, name, i);
911
	if (!__dev_get_by_name(net, buf))
L
Linus Torvalds 已提交
912 913 914 915 916 917 918 919 920
		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;
}

921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940
/**
 *	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;

941 942
	BUG_ON(!dev_net(dev));
	net = dev_net(dev);
943 944 945 946 947
	ret = __dev_alloc_name(net, name, buf);
	if (ret >= 0)
		strlcpy(dev->name, buf, IFNAMSIZ);
	return ret;
}
E
Eric Dumazet 已提交
948
EXPORT_SYMBOL(dev_alloc_name);
949

950
static int dev_get_valid_name(struct net_device *dev, const char *name, bool fmt)
951
{
952 953 954 955 956
	struct net *net;

	BUG_ON(!dev_net(dev));
	net = dev_net(dev);

957 958 959 960
	if (!dev_valid_name(name))
		return -EINVAL;

	if (fmt && strchr(name, '%'))
961
		return dev_alloc_name(dev, name);
962 963
	else if (__dev_get_by_name(net, name))
		return -EEXIST;
964 965
	else if (dev->name != name)
		strlcpy(dev->name, name, IFNAMSIZ);
966 967 968

	return 0;
}
L
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969 970 971 972 973 974 975 976 977

/**
 *	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.
 */
978
int dev_change_name(struct net_device *dev, const char *newname)
L
Linus Torvalds 已提交
979
{
980
	char oldname[IFNAMSIZ];
L
Linus Torvalds 已提交
981
	int err = 0;
982
	int ret;
983
	struct net *net;
L
Linus Torvalds 已提交
984 985

	ASSERT_RTNL();
986
	BUG_ON(!dev_net(dev));
L
Linus Torvalds 已提交
987

988
	net = dev_net(dev);
L
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989 990 991
	if (dev->flags & IFF_UP)
		return -EBUSY;

992 993 994
	if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
		return 0;

995 996
	memcpy(oldname, dev->name, IFNAMSIZ);

997
	err = dev_get_valid_name(dev, newname, 1);
998 999
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
1000

1001
rollback:
1002 1003 1004 1005
	ret = device_rename(&dev->dev, dev->name);
	if (ret) {
		memcpy(dev->name, oldname, IFNAMSIZ);
		return ret;
1006
	}
1007 1008

	write_lock_bh(&dev_base_lock);
1009
	hlist_del(&dev->name_hlist);
1010 1011 1012 1013 1014 1015
	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));
1016 1017
	write_unlock_bh(&dev_base_lock);

1018
	ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1019 1020 1021
	ret = notifier_to_errno(ret);

	if (ret) {
1022 1023
		/* err >= 0 after dev_alloc_name() or stores the first errno */
		if (err >= 0) {
1024 1025 1026
			err = ret;
			memcpy(dev->name, oldname, IFNAMSIZ);
			goto rollback;
1027 1028 1029 1030
		} else {
			printk(KERN_ERR
			       "%s: name change rollback failed: %d.\n",
			       dev->name, ret);
1031 1032
		}
	}
L
Linus Torvalds 已提交
1033 1034 1035 1036

	return err;
}

1037 1038 1039 1040
/**
 *	dev_set_alias - change ifalias of a device
 *	@dev: device
 *	@alias: name up to IFALIASZ
1041
 *	@len: limit of bytes to copy from info
1042 1043 1044 1045 1046 1047 1048 1049 1050 1051
 *
 *	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;

1052 1053 1054 1055 1056 1057 1058 1059
	if (!len) {
		if (dev->ifalias) {
			kfree(dev->ifalias);
			dev->ifalias = NULL;
		}
		return 0;
	}

E
Eric Dumazet 已提交
1060
	dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1061 1062 1063 1064 1065 1066 1067 1068
	if (!dev->ifalias)
		return -ENOMEM;

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


1069
/**
S
Stephen Hemminger 已提交
1070
 *	netdev_features_change - device changes features
1071 1072 1073 1074 1075 1076
 *	@dev: device to cause notification
 *
 *	Called to indicate a device has changed features.
 */
void netdev_features_change(struct net_device *dev)
{
1077
	call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1078 1079 1080
}
EXPORT_SYMBOL(netdev_features_change);

L
Linus Torvalds 已提交
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091
/**
 *	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) {
1092
		call_netdevice_notifiers(NETDEV_CHANGE, dev);
L
Linus Torvalds 已提交
1093 1094 1095
		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
	}
}
E
Eric Dumazet 已提交
1096
EXPORT_SYMBOL(netdev_state_change);
L
Linus Torvalds 已提交
1097

1098
int netdev_bonding_change(struct net_device *dev, unsigned long event)
1099
{
1100
	return call_netdevice_notifiers(event, dev);
1101 1102 1103
}
EXPORT_SYMBOL(netdev_bonding_change);

L
Linus Torvalds 已提交
1104 1105
/**
 *	dev_load 	- load a network module
1106
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
1107 1108 1109 1110 1111 1112 1113
 *	@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.
 */

1114
void dev_load(struct net *net, const char *name)
L
Linus Torvalds 已提交
1115
{
1116
	struct net_device *dev;
L
Linus Torvalds 已提交
1117

1118 1119 1120
	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
	rcu_read_unlock();
L
Linus Torvalds 已提交
1121

1122
	if (!dev && capable(CAP_NET_ADMIN))
L
Linus Torvalds 已提交
1123 1124
		request_module("%s", name);
}
E
Eric Dumazet 已提交
1125
EXPORT_SYMBOL(dev_load);
L
Linus Torvalds 已提交
1126

1127
static int __dev_open(struct net_device *dev)
L
Linus Torvalds 已提交
1128
{
1129
	const struct net_device_ops *ops = dev->netdev_ops;
1130
	int ret;
L
Linus Torvalds 已提交
1131

1132 1133
	ASSERT_RTNL();

L
Linus Torvalds 已提交
1134 1135 1136 1137 1138 1139
	/*
	 *	Is it even present?
	 */
	if (!netif_device_present(dev))
		return -ENODEV;

1140 1141 1142 1143 1144
	ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		return ret;

L
Linus Torvalds 已提交
1145 1146 1147 1148
	/*
	 *	Call device private open method
	 */
	set_bit(__LINK_STATE_START, &dev->state);
1149

1150 1151
	if (ops->ndo_validate_addr)
		ret = ops->ndo_validate_addr(dev);
1152

1153 1154
	if (!ret && ops->ndo_open)
		ret = ops->ndo_open(dev);
L
Linus Torvalds 已提交
1155

1156
	/*
L
Linus Torvalds 已提交
1157 1158 1159
	 *	If it went open OK then:
	 */

1160 1161 1162
	if (ret)
		clear_bit(__LINK_STATE_START, &dev->state);
	else {
L
Linus Torvalds 已提交
1163 1164 1165 1166 1167
		/*
		 *	Set the flags.
		 */
		dev->flags |= IFF_UP;

1168 1169 1170
		/*
		 *	Enable NET_DMA
		 */
1171
		net_dmaengine_get();
1172

L
Linus Torvalds 已提交
1173 1174 1175
		/*
		 *	Initialize multicasting status
		 */
1176
		dev_set_rx_mode(dev);
L
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1177 1178 1179 1180 1181 1182

		/*
		 *	Wakeup transmit queue engine
		 */
		dev_activate(dev);
	}
1183

L
Linus Torvalds 已提交
1184 1185 1186 1187
	return ret;
}

/**
1188 1189
 *	dev_open	- prepare an interface for use.
 *	@dev:	device to open
L
Linus Torvalds 已提交
1190
 *
1191 1192 1193 1194 1195 1196 1197
 *	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.
L
Linus Torvalds 已提交
1198
 */
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226
int dev_open(struct net_device *dev)
{
	int ret;

	/*
	 *	Is it already up?
	 */
	if (dev->flags & IFF_UP)
		return 0;

	/*
	 *	Open device
	 */
	ret = __dev_open(dev);
	if (ret < 0)
		return ret;

	/*
	 *	... and announce new interface.
	 */
	rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
	call_netdevice_notifiers(NETDEV_UP, dev);

	return ret;
}
EXPORT_SYMBOL(dev_open);

static int __dev_close(struct net_device *dev)
L
Linus Torvalds 已提交
1227
{
1228
	const struct net_device_ops *ops = dev->netdev_ops;
1229

1230
	ASSERT_RTNL();
1231 1232
	might_sleep();

L
Linus Torvalds 已提交
1233 1234 1235 1236
	/*
	 *	Tell people we are going down, so that they can
	 *	prepare to death, when device is still operating.
	 */
1237
	call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
L
Linus Torvalds 已提交
1238 1239 1240 1241

	clear_bit(__LINK_STATE_START, &dev->state);

	/* Synchronize to scheduled poll. We cannot touch poll list,
1242 1243 1244 1245 1246
	 * 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
1247 1248
	smp_mb__after_clear_bit(); /* Commit netif_running(). */

1249 1250
	dev_deactivate(dev);

L
Linus Torvalds 已提交
1251 1252 1253 1254 1255 1256 1257
	/*
	 *	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.
	 */
1258 1259
	if (ops->ndo_stop)
		ops->ndo_stop(dev);
L
Linus Torvalds 已提交
1260 1261 1262 1263 1264 1265 1266 1267

	/*
	 *	Device is now down.
	 */

	dev->flags &= ~IFF_UP;

	/*
1268
	 *	Shutdown NET_DMA
L
Linus Torvalds 已提交
1269
	 */
1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289
	net_dmaengine_put();

	return 0;
}

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

	__dev_close(dev);
L
Linus Torvalds 已提交
1290

1291
	/*
1292
	 * Tell people we are down
1293
	 */
1294 1295
	rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
	call_netdevice_notifiers(NETDEV_DOWN, dev);
1296

L
Linus Torvalds 已提交
1297 1298
	return 0;
}
E
Eric Dumazet 已提交
1299
EXPORT_SYMBOL(dev_close);
L
Linus Torvalds 已提交
1300 1301


1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324
/**
 *	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);


1325 1326
static int dev_boot_phase = 1;

L
Linus Torvalds 已提交
1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341
/*
 *	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
1342
 *	to the new notifier to allow device to have a race free
L
Linus Torvalds 已提交
1343 1344 1345 1346 1347 1348
 *	view of the network device list.
 */

int register_netdevice_notifier(struct notifier_block *nb)
{
	struct net_device *dev;
1349
	struct net_device *last;
1350
	struct net *net;
L
Linus Torvalds 已提交
1351 1352 1353
	int err;

	rtnl_lock();
1354
	err = raw_notifier_chain_register(&netdev_chain, nb);
1355 1356
	if (err)
		goto unlock;
1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367
	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
1368

1369 1370
			nb->notifier_call(nb, NETDEV_UP, dev);
		}
L
Linus Torvalds 已提交
1371
	}
1372 1373

unlock:
L
Linus Torvalds 已提交
1374 1375
	rtnl_unlock();
	return err;
1376 1377 1378

rollback:
	last = dev;
1379 1380 1381 1382
	for_each_net(net) {
		for_each_netdev(net, dev) {
			if (dev == last)
				break;
1383

1384 1385 1386 1387 1388
			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);
1389
			nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1390 1391
		}
	}
1392 1393

	raw_notifier_chain_unregister(&netdev_chain, nb);
1394
	goto unlock;
L
Linus Torvalds 已提交
1395
}
E
Eric Dumazet 已提交
1396
EXPORT_SYMBOL(register_netdevice_notifier);
L
Linus Torvalds 已提交
1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409

/**
 *	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)
{
1410 1411 1412
	int err;

	rtnl_lock();
1413
	err = raw_notifier_chain_unregister(&netdev_chain, nb);
1414 1415
	rtnl_unlock();
	return err;
L
Linus Torvalds 已提交
1416
}
E
Eric Dumazet 已提交
1417
EXPORT_SYMBOL(unregister_netdevice_notifier);
L
Linus Torvalds 已提交
1418 1419 1420 1421

/**
 *	call_netdevice_notifiers - call all network notifier blocks
 *      @val: value passed unmodified to notifier function
1422
 *      @dev: net_device pointer passed unmodified to notifier function
L
Linus Torvalds 已提交
1423 1424
 *
 *	Call all network notifier blocks.  Parameters and return value
1425
 *	are as for raw_notifier_call_chain().
L
Linus Torvalds 已提交
1426 1427
 */

1428
int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
L
Linus Torvalds 已提交
1429
{
1430
	ASSERT_RTNL();
1431
	return raw_notifier_call_chain(&netdev_chain, val, dev);
L
Linus Torvalds 已提交
1432 1433 1434 1435 1436 1437 1438 1439 1440
}

/* 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
1441
EXPORT_SYMBOL(net_enable_timestamp);
L
Linus Torvalds 已提交
1442 1443 1444 1445 1446

void net_disable_timestamp(void)
{
	atomic_dec(&netstamp_needed);
}
E
Eric Dumazet 已提交
1447
EXPORT_SYMBOL(net_disable_timestamp);
L
Linus Torvalds 已提交
1448

E
Eric Dumazet 已提交
1449
static inline void net_timestamp_set(struct sk_buff *skb)
L
Linus Torvalds 已提交
1450 1451
{
	if (atomic_read(&netstamp_needed))
1452
		__net_timestamp(skb);
1453 1454
	else
		skb->tstamp.tv64 = 0;
L
Linus Torvalds 已提交
1455 1456
}

E
Eric Dumazet 已提交
1457 1458 1459 1460 1461 1462
static inline void net_timestamp_check(struct sk_buff *skb)
{
	if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
		__net_timestamp(skb);
}

1463 1464 1465 1466 1467 1468 1469 1470
/**
 * dev_forward_skb - loopback an skb to another netif
 *
 * @dev: destination network device
 * @skb: buffer to forward
 *
 * return values:
 *	NET_RX_SUCCESS	(no congestion)
1471
 *	NET_RX_DROP     (packet was dropped, but freed)
1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483
 *
 * 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);
1484
	nf_reset(skb);
1485

1486 1487 1488
	if (unlikely(!(dev->flags & IFF_UP) ||
		     (skb->len > (dev->mtu + dev->hard_header_len)))) {
		atomic_long_inc(&dev->rx_dropped);
1489
		kfree_skb(skb);
1490
		return NET_RX_DROP;
1491
	}
1492
	skb_set_dev(skb, dev);
1493 1494 1495 1496 1497 1498 1499
	skb->tstamp.tv64 = 0;
	skb->pkt_type = PACKET_HOST;
	skb->protocol = eth_type_trans(skb, dev);
	return netif_rx(skb);
}
EXPORT_SYMBOL_GPL(dev_forward_skb);

L
Linus Torvalds 已提交
1500 1501 1502 1503 1504
/*
 *	Support routine. Sends outgoing frames to any network
 *	taps currently in use.
 */

1505
static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
L
Linus Torvalds 已提交
1506 1507
{
	struct packet_type *ptype;
1508

1509 1510
#ifdef CONFIG_NET_CLS_ACT
	if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
E
Eric Dumazet 已提交
1511
		net_timestamp_set(skb);
1512
#else
E
Eric Dumazet 已提交
1513
	net_timestamp_set(skb);
1514
#endif
L
Linus Torvalds 已提交
1515 1516 1517 1518 1519 1520 1521 1522 1523

	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
1524
			struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
L
Linus Torvalds 已提交
1525 1526 1527 1528 1529 1530 1531
			if (!skb2)
				break;

			/* skb->nh should be correctly
			   set by sender, so that the second statement is
			   just protection against buggy protocols.
			 */
1532
			skb_reset_mac_header(skb2);
L
Linus Torvalds 已提交
1533

1534
			if (skb_network_header(skb2) < skb2->data ||
1535
			    skb2->network_header > skb2->tail) {
L
Linus Torvalds 已提交
1536 1537 1538
				if (net_ratelimit())
					printk(KERN_CRIT "protocol %04x is "
					       "buggy, dev %s\n",
1539 1540
					       ntohs(skb2->protocol),
					       dev->name);
1541
				skb_reset_network_header(skb2);
L
Linus Torvalds 已提交
1542 1543
			}

1544
			skb2->transport_header = skb2->network_header;
L
Linus Torvalds 已提交
1545
			skb2->pkt_type = PACKET_OUTGOING;
D
David S. Miller 已提交
1546
			ptype->func(skb2, skb->dev, ptype, skb->dev);
L
Linus Torvalds 已提交
1547 1548 1549 1550 1551
		}
	}
	rcu_read_unlock();
}

1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
/*
 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
 */
void netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
{
	unsigned int real_num = dev->real_num_tx_queues;

	if (unlikely(txq > dev->num_tx_queues))
		;
	else if (txq > real_num)
		dev->real_num_tx_queues = txq;
	else if (txq < real_num) {
		dev->real_num_tx_queues = txq;
		qdisc_reset_all_tx_gt(dev, txq);
	}
}
EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1570

1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603
#ifdef CONFIG_RPS
/**
 *	netif_set_real_num_rx_queues - set actual number of RX queues used
 *	@dev: Network device
 *	@rxq: Actual number of RX queues
 *
 *	This must be called either with the rtnl_lock held or before
 *	registration of the net device.  Returns 0 on success, or a
 *	negative error code.  If called before registration, it also
 *	sets the maximum number of queues, and always succeeds.
 */
int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
{
	int rc;

	if (dev->reg_state == NETREG_REGISTERED) {
		ASSERT_RTNL();

		if (rxq > dev->num_rx_queues)
			return -EINVAL;

		rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
						  rxq);
		if (rc)
			return rc;
	}

	dev->real_num_rx_queues = rxq;
	return 0;
}
EXPORT_SYMBOL(netif_set_real_num_rx_queues);
#endif

1604
static inline void __netif_reschedule(struct Qdisc *q)
1605
{
1606 1607
	struct softnet_data *sd;
	unsigned long flags;
1608

1609 1610
	local_irq_save(flags);
	sd = &__get_cpu_var(softnet_data);
1611 1612 1613
	q->next_sched = NULL;
	*sd->output_queue_tailp = q;
	sd->output_queue_tailp = &q->next_sched;
1614 1615 1616 1617 1618 1619 1620 1621
	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);
1622 1623 1624
}
EXPORT_SYMBOL(__netif_schedule);

1625
void dev_kfree_skb_irq(struct sk_buff *skb)
1626
{
1627
	if (atomic_dec_and_test(&skb->users)) {
1628 1629
		struct softnet_data *sd;
		unsigned long flags;
1630

1631 1632 1633 1634 1635 1636 1637
		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);
	}
1638
}
1639
EXPORT_SYMBOL(dev_kfree_skb_irq);
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650

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);


1651 1652 1653 1654 1655 1656
/**
 * netif_device_detach - mark device as removed
 * @dev: network device
 *
 * Mark device as removed from system and therefore no longer available.
 */
1657 1658 1659 1660
void netif_device_detach(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
1661
		netif_tx_stop_all_queues(dev);
1662 1663 1664 1665
	}
}
EXPORT_SYMBOL(netif_device_detach);

1666 1667 1668 1669 1670 1671
/**
 * netif_device_attach - mark device as attached
 * @dev: network device
 *
 * Mark device as attached from system and restart if needed.
 */
1672 1673 1674 1675
void netif_device_attach(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
1676
		netif_tx_wake_all_queues(dev);
1677
		__netdev_watchdog_up(dev);
1678 1679 1680 1681
	}
}
EXPORT_SYMBOL(netif_device_attach);

1682 1683 1684 1685 1686 1687
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) &&
1688 1689 1690
		 protocol == htons(ETH_P_IPV6)) ||
		((features & NETIF_F_FCOE_CRC) &&
		 protocol == htons(ETH_P_FCOE)));
1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706
}

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;
}
1707

1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737
/**
 * skb_dev_set -- assign a new device to a buffer
 * @skb: buffer for the new device
 * @dev: network device
 *
 * If an skb is owned by a device already, we have to reset
 * all data private to the namespace a device belongs to
 * before assigning it a new device.
 */
#ifdef CONFIG_NET_NS
void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
{
	skb_dst_drop(skb);
	if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
		secpath_reset(skb);
		nf_reset(skb);
		skb_init_secmark(skb);
		skb->mark = 0;
		skb->priority = 0;
		skb->nf_trace = 0;
		skb->ipvs_property = 0;
#ifdef CONFIG_NET_SCHED
		skb->tc_index = 0;
#endif
	}
	skb->dev = dev;
}
EXPORT_SYMBOL(skb_set_dev);
#endif /* CONFIG_NET_NS */

L
Linus Torvalds 已提交
1738 1739 1740 1741
/*
 * Invalidate hardware checksum when packet is to be mangled, and
 * complete checksum manually on outgoing path.
 */
1742
int skb_checksum_help(struct sk_buff *skb)
L
Linus Torvalds 已提交
1743
{
1744
	__wsum csum;
1745
	int ret = 0, offset;
L
Linus Torvalds 已提交
1746

1747
	if (skb->ip_summed == CHECKSUM_COMPLETE)
1748 1749 1750 1751 1752
		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
1753 1754
	}

1755 1756 1757 1758 1759 1760 1761 1762 1763
	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
1764 1765 1766 1767 1768
		ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
		if (ret)
			goto out;
	}

1769
	*(__sum16 *)(skb->data + offset) = csum_fold(csum);
1770
out_set_summed:
L
Linus Torvalds 已提交
1771
	skb->ip_summed = CHECKSUM_NONE;
1772
out:
L
Linus Torvalds 已提交
1773 1774
	return ret;
}
E
Eric Dumazet 已提交
1775
EXPORT_SYMBOL(skb_checksum_help);
L
Linus Torvalds 已提交
1776

1777 1778 1779
/**
 *	skb_gso_segment - Perform segmentation on skb.
 *	@skb: buffer to segment
1780
 *	@features: features for the output path (see dev->features)
1781 1782
 *
 *	This function segments the given skb and returns a list of segments.
1783 1784 1785
 *
 *	It may return NULL if the skb requires no segmentation.  This is
 *	only possible when GSO is used for verifying header integrity.
1786
 */
1787
struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1788 1789 1790
{
	struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
	struct packet_type *ptype;
A
Al Viro 已提交
1791
	__be16 type = skb->protocol;
1792
	int err;
1793

1794
	skb_reset_mac_header(skb);
1795
	skb->mac_len = skb->network_header - skb->mac_header;
1796 1797
	__skb_pull(skb, skb->mac_len);

1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810
	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);

1811 1812 1813 1814 1815
		if (skb_header_cloned(skb) &&
		    (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
			return ERR_PTR(err);
	}

1816
	rcu_read_lock();
1817 1818
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1819
		if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1820
			if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1821 1822 1823 1824
				err = ptype->gso_send_check(skb);
				segs = ERR_PTR(err);
				if (err || skb_gso_ok(skb, features))
					break;
1825 1826
				__skb_push(skb, (skb->data -
						 skb_network_header(skb)));
1827
			}
1828
			segs = ptype->gso_segment(skb, features);
1829 1830 1831 1832 1833
			break;
		}
	}
	rcu_read_unlock();

1834
	__skb_push(skb, skb->data - skb_mac_header(skb));
1835

1836 1837 1838 1839
	return segs;
}
EXPORT_SYMBOL(skb_gso_segment);

1840 1841 1842 1843 1844
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG
void netdev_rx_csum_fault(struct net_device *dev)
{
	if (net_ratelimit()) {
1845
		printk(KERN_ERR "%s: hw csum failure.\n",
1846
			dev ? dev->name : "<unknown>");
1847 1848 1849 1850 1851 1852
		dump_stack();
	}
}
EXPORT_SYMBOL(netdev_rx_csum_fault);
#endif

L
Linus Torvalds 已提交
1853 1854 1855 1856 1857
/* 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.
 */

E
Eric Dumazet 已提交
1858
static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
L
Linus Torvalds 已提交
1859
{
1860
#ifdef CONFIG_HIGHMEM
L
Linus Torvalds 已提交
1861
	int i;
1862 1863 1864 1865 1866
	if (!(dev->features & NETIF_F_HIGHDMA)) {
		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
			if (PageHighMem(skb_shinfo(skb)->frags[i].page))
				return 1;
	}
L
Linus Torvalds 已提交
1867

1868 1869
	if (PCI_DMA_BUS_IS_PHYS) {
		struct device *pdev = dev->dev.parent;
L
Linus Torvalds 已提交
1870

E
Eric Dumazet 已提交
1871 1872
		if (!pdev)
			return 0;
1873 1874 1875 1876 1877 1878
		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
			dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
			if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
				return 1;
		}
	}
1879
#endif
L
Linus Torvalds 已提交
1880 1881 1882
	return 0;
}

1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916
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;
1917 1918 1919 1920 1921 1922 1923 1924
	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;
1925

1926
	if (IS_ERR(segs))
1927 1928 1929 1930 1931 1932 1933 1934 1935
		return PTR_ERR(segs);

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

	return 0;
}

E
Eric Dumazet 已提交
1936 1937
/*
 * Try to orphan skb early, right before transmission by the device.
1938 1939
 * We cannot orphan skb if tx timestamp is requested or the sk-reference
 * is needed on driver level for other reasons, e.g. see net/can/raw.c
E
Eric Dumazet 已提交
1940 1941 1942
 */
static inline void skb_orphan_try(struct sk_buff *skb)
{
1943 1944
	struct sock *sk = skb->sk;

1945
	if (sk && !skb_shinfo(skb)->tx_flags) {
1946 1947 1948 1949 1950
		/* skb_tx_hash() wont be able to get sk.
		 * We copy sk_hash into skb->rxhash
		 */
		if (!skb->rxhash)
			skb->rxhash = sk->sk_hash;
E
Eric Dumazet 已提交
1951
		skb_orphan(skb);
1952
	}
E
Eric Dumazet 已提交
1953 1954
}

1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965
/*
 * Returns true if either:
 *	1. skb has frag_list and the device doesn't support FRAGLIST, or
 *	2. skb is fragmented and the device does not support SG, or if
 *	   at least one of fragments is in highmem and device does not
 *	   support DMA from it.
 */
static inline int skb_needs_linearize(struct sk_buff *skb,
				      struct net_device *dev)
{
	return skb_is_nonlinear(skb) &&
1966
	       ((skb_has_frag_list(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
1967 1968 1969 1970
	        (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
					      illegal_highdma(dev, skb))));
}

1971 1972
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
			struct netdev_queue *txq)
1973
{
1974
	const struct net_device_ops *ops = dev->netdev_ops;
1975
	int rc = NETDEV_TX_OK;
1976

1977
	if (likely(!skb->next)) {
S
Stephen Hemminger 已提交
1978
		if (!list_empty(&ptype_all))
1979 1980
			dev_queue_xmit_nit(skb, dev);

1981 1982 1983 1984
		/*
		 * If device doesnt need skb->dst, release it right now while
		 * its hot in this cpu cache
		 */
E
Eric Dumazet 已提交
1985 1986 1987
		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
			skb_dst_drop(skb);

E
Eric Dumazet 已提交
1988
		skb_orphan_try(skb);
1989 1990 1991 1992 1993 1994

		if (netif_needs_gso(dev, skb)) {
			if (unlikely(dev_gso_segment(skb)))
				goto out_kfree_skb;
			if (skb->next)
				goto gso;
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
		} else {
			if (skb_needs_linearize(skb, dev) &&
			    __skb_linearize(skb))
				goto out_kfree_skb;

			/* If packet is not checksummed and device does not
			 * support checksumming for this protocol, complete
			 * checksumming here.
			 */
			if (skb->ip_summed == CHECKSUM_PARTIAL) {
				skb_set_transport_header(skb, skb->csum_start -
					      skb_headroom(skb));
				if (!dev_can_checksum(dev, skb) &&
				     skb_checksum_help(skb))
					goto out_kfree_skb;
			}
2011 2012
		}

2013
		rc = ops->ndo_start_xmit(skb, dev);
2014
		if (rc == NETDEV_TX_OK)
E
Eric Dumazet 已提交
2015
			txq_trans_update(txq);
2016
		return rc;
2017 2018
	}

2019
gso:
2020 2021 2022 2023 2024
	do {
		struct sk_buff *nskb = skb->next;

		skb->next = nskb->next;
		nskb->next = NULL;
2025 2026 2027 2028 2029 2030 2031 2032

		/*
		 * 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);

2033
		rc = ops->ndo_start_xmit(nskb, dev);
2034
		if (unlikely(rc != NETDEV_TX_OK)) {
2035 2036
			if (rc & ~NETDEV_TX_MASK)
				goto out_kfree_gso_skb;
2037
			nskb->next = skb->next;
2038 2039 2040
			skb->next = nskb;
			return rc;
		}
E
Eric Dumazet 已提交
2041
		txq_trans_update(txq);
2042
		if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2043
			return NETDEV_TX_BUSY;
2044
	} while (skb->next);
2045

2046 2047 2048
out_kfree_gso_skb:
	if (likely(skb->next == NULL))
		skb->destructor = DEV_GSO_CB(skb)->destructor;
2049 2050
out_kfree_skb:
	kfree_skb(skb);
2051
	return rc;
2052 2053
}

T
Tom Herbert 已提交
2054
static u32 hashrnd __read_mostly;
D
David S. Miller 已提交
2055

2056
u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
2057
{
2058
	u32 hash;
D
David S. Miller 已提交
2059

2060 2061
	if (skb_rx_queue_recorded(skb)) {
		hash = skb_get_rx_queue(skb);
E
Eric Dumazet 已提交
2062
		while (unlikely(hash >= dev->real_num_tx_queues))
2063 2064 2065
			hash -= dev->real_num_tx_queues;
		return hash;
	}
2066 2067

	if (skb->sk && skb->sk->sk_hash)
2068
		hash = skb->sk->sk_hash;
2069
	else
2070
		hash = (__force u16) skb->protocol ^ skb->rxhash;
T
Tom Herbert 已提交
2071
	hash = jhash_1word(hash, hashrnd);
D
David S. Miller 已提交
2072 2073

	return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
2074
}
2075
EXPORT_SYMBOL(skb_tx_hash);
2076

2077 2078 2079 2080
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()) {
E
Eric Dumazet 已提交
2081 2082 2083
			pr_warning("%s selects TX queue %d, but "
				"real number of TX queues is %d\n",
				dev->name, queue_index, dev->real_num_tx_queues);
2084 2085 2086 2087 2088 2089
		}
		return 0;
	}
	return queue_index;
}

2090 2091 2092
static struct netdev_queue *dev_pick_tx(struct net_device *dev,
					struct sk_buff *skb)
{
2093
	int queue_index;
2094
	const struct net_device_ops *ops = dev->netdev_ops;
2095

2096 2097 2098 2099 2100 2101 2102
	if (ops->ndo_select_queue) {
		queue_index = ops->ndo_select_queue(dev, skb);
		queue_index = dev_cap_txqueue(dev, queue_index);
	} else {
		struct sock *sk = skb->sk;
		queue_index = sk_tx_queue_get(sk);
		if (queue_index < 0) {
2103 2104 2105 2106

			queue_index = 0;
			if (dev->real_num_tx_queues > 1)
				queue_index = skb_tx_hash(dev, skb);
2107

E
Eric Dumazet 已提交
2108
			if (sk) {
2109
				struct dst_entry *dst = rcu_dereference_check(sk->sk_dst_cache, 1);
E
Eric Dumazet 已提交
2110 2111 2112 2113

				if (dst && skb_dst(skb) == dst)
					sk_tx_queue_set(sk, queue_index);
			}
2114 2115
		}
	}
2116

2117 2118
	skb_set_queue_mapping(skb, queue_index);
	return netdev_get_tx_queue(dev, queue_index);
2119 2120
}

2121 2122 2123 2124 2125
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);
2126
	bool contended = qdisc_is_running(q);
2127 2128
	int rc;

2129 2130 2131 2132 2133 2134 2135 2136 2137
	/*
	 * Heuristic to force contended enqueues to serialize on a
	 * separate lock before trying to get qdisc main lock.
	 * This permits __QDISC_STATE_RUNNING owner to get the lock more often
	 * and dequeue packets faster.
	 */
	if (unlikely(contended))
		spin_lock(&q->busylock);

2138 2139 2140 2141 2142
	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) &&
2143
		   qdisc_run_begin(q)) {
2144 2145 2146 2147 2148
		/*
		 * 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.
		 */
E
Eric Dumazet 已提交
2149 2150
		if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
			skb_dst_force(skb);
2151
		__qdisc_update_bstats(q, skb->len);
2152 2153 2154 2155 2156
		if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
			if (unlikely(contended)) {
				spin_unlock(&q->busylock);
				contended = false;
			}
2157
			__qdisc_run(q);
2158
		} else
2159
			qdisc_run_end(q);
2160 2161 2162

		rc = NET_XMIT_SUCCESS;
	} else {
E
Eric Dumazet 已提交
2163
		skb_dst_force(skb);
2164
		rc = qdisc_enqueue_root(skb, q);
2165 2166 2167 2168 2169 2170 2171
		if (qdisc_run_begin(q)) {
			if (unlikely(contended)) {
				spin_unlock(&q->busylock);
				contended = false;
			}
			__qdisc_run(q);
		}
2172 2173
	}
	spin_unlock(root_lock);
2174 2175
	if (unlikely(contended))
		spin_unlock(&q->busylock);
2176 2177 2178
	return rc;
}

2179 2180 2181
static DEFINE_PER_CPU(int, xmit_recursion);
#define RECURSION_LIMIT 3

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
/**
 *	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
2207 2208 2209
int dev_queue_xmit(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
2210
	struct netdev_queue *txq;
L
Linus Torvalds 已提交
2211 2212 2213
	struct Qdisc *q;
	int rc = -ENOMEM;

2214 2215
	/* Disable soft irqs for various locks below. Also
	 * stops preemption for RCU.
L
Linus Torvalds 已提交
2216
	 */
2217
	rcu_read_lock_bh();
L
Linus Torvalds 已提交
2218

2219
	txq = dev_pick_tx(dev, skb);
2220
	q = rcu_dereference_bh(txq->qdisc);
2221

L
Linus Torvalds 已提交
2222
#ifdef CONFIG_NET_CLS_ACT
E
Eric Dumazet 已提交
2223
	skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
L
Linus Torvalds 已提交
2224 2225
#endif
	if (q->enqueue) {
2226
		rc = __dev_xmit_skb(skb, q, dev, txq);
2227
		goto out;
L
Linus Torvalds 已提交
2228 2229 2230 2231 2232
	}

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

H
Herbert Xu 已提交
2233 2234
	   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
2235 2236 2237 2238 2239 2240 2241 2242 2243 2244
	   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 */

2245
		if (txq->xmit_lock_owner != cpu) {
L
Linus Torvalds 已提交
2246

2247 2248 2249
			if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
				goto recursion_alert;

2250
			HARD_TX_LOCK(dev, txq, cpu);
L
Linus Torvalds 已提交
2251

2252
			if (!netif_tx_queue_stopped(txq)) {
2253
				__this_cpu_inc(xmit_recursion);
2254
				rc = dev_hard_start_xmit(skb, dev, txq);
2255
				__this_cpu_dec(xmit_recursion);
2256
				if (dev_xmit_complete(rc)) {
2257
					HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
2258 2259 2260
					goto out;
				}
			}
2261
			HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
2262 2263 2264 2265 2266
			if (net_ratelimit())
				printk(KERN_CRIT "Virtual device %s asks to "
				       "queue packet!\n", dev->name);
		} else {
			/* Recursion is detected! It is possible,
2267 2268 2269
			 * unfortunately
			 */
recursion_alert:
L
Linus Torvalds 已提交
2270 2271 2272 2273 2274 2275 2276
			if (net_ratelimit())
				printk(KERN_CRIT "Dead loop on virtual device "
				       "%s, fix it urgently!\n", dev->name);
		}
	}

	rc = -ENETDOWN;
2277
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
2278 2279 2280 2281

	kfree_skb(skb);
	return rc;
out:
2282
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
2283 2284
	return rc;
}
E
Eric Dumazet 已提交
2285
EXPORT_SYMBOL(dev_queue_xmit);
L
Linus Torvalds 已提交
2286 2287 2288 2289 2290 2291


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

2292
int netdev_max_backlog __read_mostly = 1000;
E
Eric Dumazet 已提交
2293
int netdev_tstamp_prequeue __read_mostly = 1;
2294 2295
int netdev_budget __read_mostly = 300;
int weight_p __read_mostly = 64;            /* old backlog weight */
L
Linus Torvalds 已提交
2296

E
Eric Dumazet 已提交
2297 2298 2299 2300 2301 2302 2303 2304
/* Called with irq disabled */
static inline void ____napi_schedule(struct softnet_data *sd,
				     struct napi_struct *napi)
{
	list_add_tail(&napi->poll_list, &sd->poll_list);
	__raise_softirq_irqoff(NET_RX_SOFTIRQ);
}

T
Tom Herbert 已提交
2305
/*
2306 2307 2308
 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
 * and src/dst port numbers. Returns a non-zero hash number on success
 * and 0 on failure.
T
Tom Herbert 已提交
2309
 */
2310
__u32 __skb_get_rxhash(struct sk_buff *skb)
T
Tom Herbert 已提交
2311
{
2312
	int nhoff, hash = 0, poff;
T
Tom Herbert 已提交
2313 2314 2315
	struct ipv6hdr *ip6;
	struct iphdr *ip;
	u8 ip_proto;
C
Changli Gao 已提交
2316 2317 2318 2319 2320
	u32 addr1, addr2, ihl;
	union {
		u32 v32;
		u16 v16[2];
	} ports;
T
Tom Herbert 已提交
2321

2322
	nhoff = skb_network_offset(skb);
T
Tom Herbert 已提交
2323 2324 2325

	switch (skb->protocol) {
	case __constant_htons(ETH_P_IP):
2326
		if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
T
Tom Herbert 已提交
2327 2328
			goto done;

2329
		ip = (struct iphdr *) (skb->data + nhoff);
2330 2331 2332 2333
		if (ip->frag_off & htons(IP_MF | IP_OFFSET))
			ip_proto = 0;
		else
			ip_proto = ip->protocol;
E
Eric Dumazet 已提交
2334 2335
		addr1 = (__force u32) ip->saddr;
		addr2 = (__force u32) ip->daddr;
T
Tom Herbert 已提交
2336 2337 2338
		ihl = ip->ihl;
		break;
	case __constant_htons(ETH_P_IPV6):
2339
		if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
T
Tom Herbert 已提交
2340 2341
			goto done;

2342
		ip6 = (struct ipv6hdr *) (skb->data + nhoff);
T
Tom Herbert 已提交
2343
		ip_proto = ip6->nexthdr;
E
Eric Dumazet 已提交
2344 2345
		addr1 = (__force u32) ip6->saddr.s6_addr32[3];
		addr2 = (__force u32) ip6->daddr.s6_addr32[3];
T
Tom Herbert 已提交
2346 2347 2348 2349 2350
		ihl = (40 >> 2);
		break;
	default:
		goto done;
	}
2351

2352 2353 2354 2355 2356 2357
	ports.v32 = 0;
	poff = proto_ports_offset(ip_proto);
	if (poff >= 0) {
		nhoff += ihl * 4 + poff;
		if (pskb_may_pull(skb, nhoff + 4)) {
			ports.v32 = * (__force u32 *) (skb->data + nhoff);
C
Changli Gao 已提交
2358 2359
			if (ports.v16[1] < ports.v16[0])
				swap(ports.v16[0], ports.v16[1]);
E
Eric Dumazet 已提交
2360
		}
T
Tom Herbert 已提交
2361 2362
	}

E
Eric Dumazet 已提交
2363 2364 2365
	/* get a consistent hash (same value on both flow directions) */
	if (addr2 < addr1)
		swap(addr1, addr2);
T
Tom Herbert 已提交
2366

2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390
	hash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
	if (!hash)
		hash = 1;

done:
	return hash;
}
EXPORT_SYMBOL(__skb_get_rxhash);

#ifdef CONFIG_RPS

/* One global table that all flow-based protocols share. */
struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
EXPORT_SYMBOL(rps_sock_flow_table);

/*
 * get_rps_cpu is called from netif_receive_skb and returns the target
 * CPU from the RPS map of the receiving queue for a given skb.
 * rcu_read_lock must be held on entry.
 */
static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
		       struct rps_dev_flow **rflowp)
{
	struct netdev_rx_queue *rxqueue;
2391
	struct rps_map *map = NULL;
2392 2393 2394 2395 2396 2397 2398
	struct rps_dev_flow_table *flow_table;
	struct rps_sock_flow_table *sock_flow_table;
	int cpu = -1;
	u16 tcpu;

	if (skb_rx_queue_recorded(skb)) {
		u16 index = skb_get_rx_queue(skb);
2399 2400 2401 2402 2403
		if (unlikely(index >= dev->real_num_rx_queues)) {
			WARN_ONCE(dev->real_num_rx_queues > 1,
				  "%s received packet on queue %u, but number "
				  "of RX queues is %u\n",
				  dev->name, index, dev->real_num_rx_queues);
2404 2405 2406 2407 2408 2409
			goto done;
		}
		rxqueue = dev->_rx + index;
	} else
		rxqueue = dev->_rx;

2410 2411 2412 2413 2414 2415 2416 2417 2418
	if (rxqueue->rps_map) {
		map = rcu_dereference(rxqueue->rps_map);
		if (map && map->len == 1) {
			tcpu = map->cpus[0];
			if (cpu_online(tcpu))
				cpu = tcpu;
			goto done;
		}
	} else if (!rxqueue->rps_flow_table) {
2419
		goto done;
2420
	}
2421

2422
	skb_reset_network_header(skb);
2423 2424 2425
	if (!skb_get_rxhash(skb))
		goto done;

T
Tom Herbert 已提交
2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464
	flow_table = rcu_dereference(rxqueue->rps_flow_table);
	sock_flow_table = rcu_dereference(rps_sock_flow_table);
	if (flow_table && sock_flow_table) {
		u16 next_cpu;
		struct rps_dev_flow *rflow;

		rflow = &flow_table->flows[skb->rxhash & flow_table->mask];
		tcpu = rflow->cpu;

		next_cpu = sock_flow_table->ents[skb->rxhash &
		    sock_flow_table->mask];

		/*
		 * If the desired CPU (where last recvmsg was done) is
		 * different from current CPU (one in the rx-queue flow
		 * table entry), switch if one of the following holds:
		 *   - Current CPU is unset (equal to RPS_NO_CPU).
		 *   - Current CPU is offline.
		 *   - The current CPU's queue tail has advanced beyond the
		 *     last packet that was enqueued using this table entry.
		 *     This guarantees that all previous packets for the flow
		 *     have been dequeued, thus preserving in order delivery.
		 */
		if (unlikely(tcpu != next_cpu) &&
		    (tcpu == RPS_NO_CPU || !cpu_online(tcpu) ||
		     ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
		      rflow->last_qtail)) >= 0)) {
			tcpu = rflow->cpu = next_cpu;
			if (tcpu != RPS_NO_CPU)
				rflow->last_qtail = per_cpu(softnet_data,
				    tcpu).input_queue_head;
		}
		if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
			*rflowp = rflow;
			cpu = tcpu;
			goto done;
		}
	}

T
Tom Herbert 已提交
2465
	if (map) {
T
Tom Herbert 已提交
2466
		tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
T
Tom Herbert 已提交
2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478

		if (cpu_online(tcpu)) {
			cpu = tcpu;
			goto done;
		}
	}

done:
	return cpu;
}

/* Called from hardirq (IPI) context */
E
Eric Dumazet 已提交
2479
static void rps_trigger_softirq(void *data)
T
Tom Herbert 已提交
2480
{
E
Eric Dumazet 已提交
2481 2482
	struct softnet_data *sd = data;

E
Eric Dumazet 已提交
2483
	____napi_schedule(sd, &sd->backlog);
C
Changli Gao 已提交
2484
	sd->received_rps++;
T
Tom Herbert 已提交
2485
}
E
Eric Dumazet 已提交
2486

T
Tom Herbert 已提交
2487
#endif /* CONFIG_RPS */
T
Tom Herbert 已提交
2488

E
Eric Dumazet 已提交
2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509
/*
 * Check if this softnet_data structure is another cpu one
 * If yes, queue it to our IPI list and return 1
 * If no, return 0
 */
static int rps_ipi_queued(struct softnet_data *sd)
{
#ifdef CONFIG_RPS
	struct softnet_data *mysd = &__get_cpu_var(softnet_data);

	if (sd != mysd) {
		sd->rps_ipi_next = mysd->rps_ipi_list;
		mysd->rps_ipi_list = sd;

		__raise_softirq_irqoff(NET_RX_SOFTIRQ);
		return 1;
	}
#endif /* CONFIG_RPS */
	return 0;
}

T
Tom Herbert 已提交
2510 2511 2512 2513
/*
 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
 * queue (may be a remote CPU queue).
 */
T
Tom Herbert 已提交
2514 2515
static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
			      unsigned int *qtail)
T
Tom Herbert 已提交
2516
{
E
Eric Dumazet 已提交
2517
	struct softnet_data *sd;
T
Tom Herbert 已提交
2518 2519
	unsigned long flags;

E
Eric Dumazet 已提交
2520
	sd = &per_cpu(softnet_data, cpu);
T
Tom Herbert 已提交
2521 2522 2523

	local_irq_save(flags);

E
Eric Dumazet 已提交
2524
	rps_lock(sd);
2525 2526
	if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
		if (skb_queue_len(&sd->input_pkt_queue)) {
T
Tom Herbert 已提交
2527
enqueue:
E
Eric Dumazet 已提交
2528
			__skb_queue_tail(&sd->input_pkt_queue, skb);
2529
			input_queue_tail_incr_save(sd, qtail);
E
Eric Dumazet 已提交
2530
			rps_unlock(sd);
2531
			local_irq_restore(flags);
T
Tom Herbert 已提交
2532 2533 2534
			return NET_RX_SUCCESS;
		}

2535 2536 2537 2538
		/* Schedule NAPI for backlog device
		 * We can use non atomic operation since we own the queue lock
		 */
		if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
E
Eric Dumazet 已提交
2539
			if (!rps_ipi_queued(sd))
E
Eric Dumazet 已提交
2540
				____napi_schedule(sd, &sd->backlog);
T
Tom Herbert 已提交
2541 2542 2543 2544
		}
		goto enqueue;
	}

C
Changli Gao 已提交
2545
	sd->dropped++;
E
Eric Dumazet 已提交
2546
	rps_unlock(sd);
T
Tom Herbert 已提交
2547 2548 2549

	local_irq_restore(flags);

2550
	atomic_long_inc(&skb->dev->rx_dropped);
T
Tom Herbert 已提交
2551 2552 2553
	kfree_skb(skb);
	return NET_RX_DROP;
}
L
Linus Torvalds 已提交
2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571

/**
 *	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)
{
2572
	int ret;
L
Linus Torvalds 已提交
2573 2574 2575 2576 2577

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

E
Eric Dumazet 已提交
2578 2579
	if (netdev_tstamp_prequeue)
		net_timestamp_check(skb);
L
Linus Torvalds 已提交
2580

E
Eric Dumazet 已提交
2581
#ifdef CONFIG_RPS
2582
	{
T
Tom Herbert 已提交
2583
		struct rps_dev_flow voidflow, *rflow = &voidflow;
2584 2585
		int cpu;

2586
		preempt_disable();
2587
		rcu_read_lock();
T
Tom Herbert 已提交
2588 2589

		cpu = get_rps_cpu(skb->dev, skb, &rflow);
2590 2591
		if (cpu < 0)
			cpu = smp_processor_id();
T
Tom Herbert 已提交
2592 2593 2594

		ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);

2595
		rcu_read_unlock();
2596
		preempt_enable();
2597
	}
2598
#else
T
Tom Herbert 已提交
2599 2600 2601 2602 2603
	{
		unsigned int qtail;
		ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
		put_cpu();
	}
2604
#endif
2605
	return ret;
L
Linus Torvalds 已提交
2606
}
E
Eric Dumazet 已提交
2607
EXPORT_SYMBOL(netif_rx);
L
Linus Torvalds 已提交
2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638

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;

2639
			WARN_ON(atomic_read(&skb->users));
L
Linus Torvalds 已提交
2640 2641 2642 2643 2644
			__kfree_skb(skb);
		}
	}

	if (sd->output_queue) {
2645
		struct Qdisc *head;
L
Linus Torvalds 已提交
2646 2647 2648 2649

		local_irq_disable();
		head = sd->output_queue;
		sd->output_queue = NULL;
2650
		sd->output_queue_tailp = &sd->output_queue;
L
Linus Torvalds 已提交
2651 2652 2653
		local_irq_enable();

		while (head) {
2654 2655 2656
			struct Qdisc *q = head;
			spinlock_t *root_lock;

L
Linus Torvalds 已提交
2657 2658
			head = head->next_sched;

2659
			root_lock = qdisc_lock(q);
2660
			if (spin_trylock(root_lock)) {
2661 2662 2663
				smp_mb__before_clear_bit();
				clear_bit(__QDISC_STATE_SCHED,
					  &q->state);
2664 2665
				qdisc_run(q);
				spin_unlock(root_lock);
L
Linus Torvalds 已提交
2666
			} else {
2667
				if (!test_bit(__QDISC_STATE_DEACTIVATED,
2668
					      &q->state)) {
2669
					__netif_reschedule(q);
2670 2671 2672 2673 2674
				} else {
					smp_mb__before_clear_bit();
					clear_bit(__QDISC_STATE_SCHED,
						  &q->state);
				}
L
Linus Torvalds 已提交
2675 2676 2677 2678 2679
			}
		}
	}
}

2680 2681 2682
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
2683 2684
{
	atomic_inc(&skb->users);
D
David S. Miller 已提交
2685
	return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2686 2687
}

2688 2689
#if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
    (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
2690 2691 2692
/* This hook is defined here for ATM LANE */
int (*br_fdb_test_addr_hook)(struct net_device *dev,
			     unsigned char *addr) __read_mostly;
2693
EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2694
#endif
L
Linus Torvalds 已提交
2695 2696 2697 2698 2699 2700

#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
2701
 * NOTE: This doesnt stop any functionality; if you dont have
L
Linus Torvalds 已提交
2702 2703 2704
 * the ingress scheduler, you just cant add policies on ingress.
 *
 */
2705
static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
L
Linus Torvalds 已提交
2706 2707
{
	struct net_device *dev = skb->dev;
2708
	u32 ttl = G_TC_RTTL(skb->tc_verd);
2709 2710
	int result = TC_ACT_OK;
	struct Qdisc *q;
2711

2712 2713 2714 2715
	if (unlikely(MAX_RED_LOOP < ttl++)) {
		if (net_ratelimit())
			pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
			       skb->skb_iif, dev->ifindex);
2716 2717
		return TC_ACT_SHOT;
	}
L
Linus Torvalds 已提交
2718

2719 2720
	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
2721

2722
	q = rxq->qdisc;
2723
	if (q != &noop_qdisc) {
2724
		spin_lock(qdisc_lock(q));
2725 2726
		if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
			result = qdisc_enqueue_root(skb, q);
2727 2728
		spin_unlock(qdisc_lock(q));
	}
2729 2730 2731

	return result;
}
2732

2733 2734 2735 2736
static inline struct sk_buff *handle_ing(struct sk_buff *skb,
					 struct packet_type **pt_prev,
					 int *ret, struct net_device *orig_dev)
{
2737 2738 2739
	struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);

	if (!rxq || rxq->qdisc == &noop_qdisc)
2740
		goto out;
L
Linus Torvalds 已提交
2741

2742 2743 2744
	if (*pt_prev) {
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
		*pt_prev = NULL;
L
Linus Torvalds 已提交
2745 2746
	}

2747
	switch (ing_filter(skb, rxq)) {
2748 2749 2750 2751 2752 2753 2754 2755 2756
	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
2757 2758 2759
}
#endif

2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786
/*
 * 	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();
}

2787 2788 2789 2790
/**
 *	netdev_rx_handler_register - register receive handler
 *	@dev: device to register a handler for
 *	@rx_handler: receive handler to register
J
Jiri Pirko 已提交
2791
 *	@rx_handler_data: data pointer that is used by rx handler
2792 2793 2794 2795 2796 2797 2798 2799
 *
 *	Register a receive hander for a device. This handler will then be
 *	called from __netif_receive_skb. A negative errno code is returned
 *	on a failure.
 *
 *	The caller must hold the rtnl_mutex.
 */
int netdev_rx_handler_register(struct net_device *dev,
J
Jiri Pirko 已提交
2800 2801
			       rx_handler_func_t *rx_handler,
			       void *rx_handler_data)
2802 2803 2804 2805 2806 2807
{
	ASSERT_RTNL();

	if (dev->rx_handler)
		return -EBUSY;

J
Jiri Pirko 已提交
2808
	rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827
	rcu_assign_pointer(dev->rx_handler, rx_handler);

	return 0;
}
EXPORT_SYMBOL_GPL(netdev_rx_handler_register);

/**
 *	netdev_rx_handler_unregister - unregister receive handler
 *	@dev: device to unregister a handler from
 *
 *	Unregister a receive hander from a device.
 *
 *	The caller must hold the rtnl_mutex.
 */
void netdev_rx_handler_unregister(struct net_device *dev)
{

	ASSERT_RTNL();
	rcu_assign_pointer(dev->rx_handler, NULL);
J
Jiri Pirko 已提交
2828
	rcu_assign_pointer(dev->rx_handler_data, NULL);
2829 2830 2831
}
EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);

2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852
static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
					      struct net_device *master)
{
	if (skb->pkt_type == PACKET_HOST) {
		u16 *dest = (u16 *) eth_hdr(skb)->h_dest;

		memcpy(dest, master->dev_addr, ETH_ALEN);
	}
}

/* On bonding slaves other than the currently active slave, suppress
 * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and
 * ARP on active-backup slaves with arp_validate enabled.
 */
int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master)
{
	struct net_device *dev = skb->dev;

	if (master->priv_flags & IFF_MASTER_ARPMON)
		dev->last_rx = jiffies;

2853 2854
	if ((master->priv_flags & IFF_MASTER_ALB) &&
	    (master->priv_flags & IFF_BRIDGE_PORT)) {
2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881
		/* Do address unmangle. The local destination address
		 * will be always the one master has. Provides the right
		 * functionality in a bridge.
		 */
		skb_bond_set_mac_by_master(skb, master);
	}

	if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
		if ((dev->priv_flags & IFF_SLAVE_NEEDARP) &&
		    skb->protocol == __cpu_to_be16(ETH_P_ARP))
			return 0;

		if (master->priv_flags & IFF_MASTER_ALB) {
			if (skb->pkt_type != PACKET_BROADCAST &&
			    skb->pkt_type != PACKET_MULTICAST)
				return 0;
		}
		if (master->priv_flags & IFF_MASTER_8023AD &&
		    skb->protocol == __cpu_to_be16(ETH_P_SLOW))
			return 0;

		return 1;
	}
	return 0;
}
EXPORT_SYMBOL(__skb_bond_should_drop);

2882
static int __netif_receive_skb(struct sk_buff *skb)
L
Linus Torvalds 已提交
2883 2884
{
	struct packet_type *ptype, *pt_prev;
2885
	rx_handler_func_t *rx_handler;
D
David S. Miller 已提交
2886
	struct net_device *orig_dev;
2887
	struct net_device *master;
2888
	struct net_device *null_or_orig;
2889
	struct net_device *orig_or_bond;
L
Linus Torvalds 已提交
2890
	int ret = NET_RX_DROP;
A
Al Viro 已提交
2891
	__be16 type;
L
Linus Torvalds 已提交
2892

E
Eric Dumazet 已提交
2893 2894
	if (!netdev_tstamp_prequeue)
		net_timestamp_check(skb);
2895

2896 2897
	if (vlan_tx_tag_present(skb))
		vlan_hwaccel_do_receive(skb);
2898

L
Linus Torvalds 已提交
2899
	/* if we've gotten here through NAPI, check netpoll */
2900
	if (netpoll_receive_skb(skb))
L
Linus Torvalds 已提交
2901 2902
		return NET_RX_DROP;

2903 2904
	if (!skb->skb_iif)
		skb->skb_iif = skb->dev->ifindex;
2905

2906 2907 2908 2909 2910 2911 2912 2913
	/*
	 * bonding note: skbs received on inactive slaves should only
	 * be delivered to pkt handlers that are exact matches.  Also
	 * the deliver_no_wcard flag will be set.  If packet handlers
	 * are sensitive to duplicate packets these skbs will need to
	 * be dropped at the handler.  The vlan accel path may have
	 * already set the deliver_no_wcard flag.
	 */
2914
	null_or_orig = NULL;
J
Joe Eykholt 已提交
2915
	orig_dev = skb->dev;
2916
	master = ACCESS_ONCE(orig_dev->master);
2917 2918 2919 2920 2921
	if (skb->deliver_no_wcard)
		null_or_orig = orig_dev;
	else if (master) {
		if (skb_bond_should_drop(skb, master)) {
			skb->deliver_no_wcard = 1;
2922
			null_or_orig = orig_dev; /* deliver only exact match */
2923
		} else
2924
			skb->dev = master;
J
Joe Eykholt 已提交
2925
	}
2926

2927
	__this_cpu_inc(softnet_data.processed);
2928
	skb_reset_network_header(skb);
2929
	skb_reset_transport_header(skb);
2930
	skb->mac_len = skb->network_header - skb->mac_header;
L
Linus Torvalds 已提交
2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943

	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) {
2944 2945
		if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
		    ptype->dev == orig_dev) {
2946
			if (pt_prev)
D
David S. Miller 已提交
2947
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2948 2949 2950 2951 2952
			pt_prev = ptype;
		}
	}

#ifdef CONFIG_NET_CLS_ACT
2953 2954
	skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
	if (!skb)
L
Linus Torvalds 已提交
2955 2956 2957 2958
		goto out;
ncls:
#endif

2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969
	/* Handle special case of bridge or macvlan */
	rx_handler = rcu_dereference(skb->dev->rx_handler);
	if (rx_handler) {
		if (pt_prev) {
			ret = deliver_skb(skb, pt_prev, orig_dev);
			pt_prev = NULL;
		}
		skb = rx_handler(skb);
		if (!skb)
			goto out;
	}
L
Linus Torvalds 已提交
2970

2971 2972 2973 2974 2975 2976
	/*
	 * Make sure frames received on VLAN interfaces stacked on
	 * bonding interfaces still make their way to any base bonding
	 * device that may have registered for a specific ptype.  The
	 * handler may have to adjust skb->dev and orig_dev.
	 */
2977
	orig_or_bond = orig_dev;
2978 2979
	if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
	    (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2980
		orig_or_bond = vlan_dev_real_dev(skb->dev);
2981 2982
	}

L
Linus Torvalds 已提交
2983
	type = skb->protocol;
2984 2985
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2986
		if (ptype->type == type && (ptype->dev == null_or_orig ||
2987
		     ptype->dev == skb->dev || ptype->dev == orig_dev ||
2988
		     ptype->dev == orig_or_bond)) {
2989
			if (pt_prev)
D
David S. Miller 已提交
2990
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2991 2992 2993 2994 2995
			pt_prev = ptype;
		}
	}

	if (pt_prev) {
D
David S. Miller 已提交
2996
		ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2997
	} else {
2998
		atomic_long_inc(&skb->dev->rx_dropped);
L
Linus Torvalds 已提交
2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009
		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;
}
T
Tom Herbert 已提交
3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027

/**
 *	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
 */
int netif_receive_skb(struct sk_buff *skb)
{
E
Eric Dumazet 已提交
3028 3029 3030
	if (netdev_tstamp_prequeue)
		net_timestamp_check(skb);

3031 3032 3033
	if (skb_defer_rx_timestamp(skb))
		return NET_RX_SUCCESS;

E
Eric Dumazet 已提交
3034
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
3035 3036 3037
	{
		struct rps_dev_flow voidflow, *rflow = &voidflow;
		int cpu, ret;
T
Tom Herbert 已提交
3038

E
Eric Dumazet 已提交
3039 3040 3041
		rcu_read_lock();

		cpu = get_rps_cpu(skb->dev, skb, &rflow);
T
Tom Herbert 已提交
3042

E
Eric Dumazet 已提交
3043 3044 3045 3046 3047 3048 3049
		if (cpu >= 0) {
			ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
			rcu_read_unlock();
		} else {
			rcu_read_unlock();
			ret = __netif_receive_skb(skb);
		}
T
Tom Herbert 已提交
3050

E
Eric Dumazet 已提交
3051
		return ret;
T
Tom Herbert 已提交
3052
	}
3053 3054 3055
#else
	return __netif_receive_skb(skb);
#endif
T
Tom Herbert 已提交
3056
}
E
Eric Dumazet 已提交
3057
EXPORT_SYMBOL(netif_receive_skb);
L
Linus Torvalds 已提交
3058

E
Eric Dumazet 已提交
3059 3060 3061
/* Network device is going away, flush any packets still pending
 * Called with irqs disabled.
 */
3062
static void flush_backlog(void *arg)
3063
{
3064
	struct net_device *dev = arg;
E
Eric Dumazet 已提交
3065
	struct softnet_data *sd = &__get_cpu_var(softnet_data);
3066 3067
	struct sk_buff *skb, *tmp;

E
Eric Dumazet 已提交
3068
	rps_lock(sd);
3069
	skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3070
		if (skb->dev == dev) {
E
Eric Dumazet 已提交
3071
			__skb_unlink(skb, &sd->input_pkt_queue);
3072
			kfree_skb(skb);
3073
			input_queue_head_incr(sd);
3074
		}
3075
	}
E
Eric Dumazet 已提交
3076
	rps_unlock(sd);
3077 3078 3079 3080 3081

	skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
		if (skb->dev == dev) {
			__skb_unlink(skb, &sd->process_queue);
			kfree_skb(skb);
3082
			input_queue_head_incr(sd);
3083 3084
		}
	}
3085 3086
}

3087 3088 3089 3090 3091 3092 3093
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;

3094 3095
	if (NAPI_GRO_CB(skb)->count == 1) {
		skb_shinfo(skb)->gso_size = 0;
3096
		goto out;
3097
	}
3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118

	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);
}

E
Eric Dumazet 已提交
3119
inline void napi_gro_flush(struct napi_struct *napi)
3120 3121 3122 3123 3124 3125 3126 3127 3128
{
	struct sk_buff *skb, *next;

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

3129
	napi->gro_count = 0;
3130 3131
	napi->gro_list = NULL;
}
E
Eric Dumazet 已提交
3132
EXPORT_SYMBOL(napi_gro_flush);
3133

3134
enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3135 3136 3137 3138 3139
{
	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
3140
	int same_flow;
3141
	int mac_len;
3142
	enum gro_result ret;
3143

3144
	if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3145 3146
		goto normal;

3147
	if (skb_is_gso(skb) || skb_has_frag_list(skb))
3148 3149
		goto normal;

3150 3151 3152 3153 3154
	rcu_read_lock();
	list_for_each_entry_rcu(ptype, head, list) {
		if (ptype->type != type || ptype->dev || !ptype->gro_receive)
			continue;

3155
		skb_set_network_header(skb, skb_gro_offset(skb));
3156 3157 3158 3159
		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
3160
		NAPI_GRO_CB(skb)->free = 0;
3161 3162 3163 3164 3165 3166 3167 3168 3169

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

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

H
Herbert Xu 已提交
3170
	same_flow = NAPI_GRO_CB(skb)->same_flow;
3171
	ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
H
Herbert Xu 已提交
3172

3173 3174 3175 3176 3177 3178
	if (pp) {
		struct sk_buff *nskb = *pp;

		*pp = nskb->next;
		nskb->next = NULL;
		napi_gro_complete(nskb);
3179
		napi->gro_count--;
3180 3181
	}

H
Herbert Xu 已提交
3182
	if (same_flow)
3183 3184
		goto ok;

3185
	if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3186 3187
		goto normal;

3188
	napi->gro_count++;
3189
	NAPI_GRO_CB(skb)->count = 1;
3190
	skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3191 3192
	skb->next = napi->gro_list;
	napi->gro_list = skb;
3193
	ret = GRO_HELD;
3194

3195
pull:
H
Herbert Xu 已提交
3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212
	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,
3213
				--skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
H
Herbert Xu 已提交
3214
		}
3215 3216
	}

3217
ok:
3218
	return ret;
3219 3220

normal:
3221 3222
	ret = GRO_NORMAL;
	goto pull;
H
Herbert Xu 已提交
3223
}
3224 3225
EXPORT_SYMBOL(dev_gro_receive);

3226
static inline gro_result_t
3227
__napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3228 3229 3230 3231
{
	struct sk_buff *p;

	for (p = napi->gro_list; p; p = p->next) {
3232 3233 3234 3235
		unsigned long diffs;

		diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
		diffs |= compare_ether_header(skb_mac_header(p),
3236
					      skb_gro_mac_header(skb));
3237
		NAPI_GRO_CB(p)->same_flow = !diffs;
3238 3239 3240 3241 3242
		NAPI_GRO_CB(p)->flush = 0;
	}

	return dev_gro_receive(napi, skb);
}
H
Herbert Xu 已提交
3243

3244
gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
H
Herbert Xu 已提交
3245
{
3246 3247
	switch (ret) {
	case GRO_NORMAL:
3248 3249 3250
		if (netif_receive_skb(skb))
			ret = GRO_DROP;
		break;
H
Herbert Xu 已提交
3251

3252 3253
	case GRO_DROP:
	case GRO_MERGED_FREE:
H
Herbert Xu 已提交
3254 3255
		kfree_skb(skb);
		break;
3256 3257 3258 3259

	case GRO_HELD:
	case GRO_MERGED:
		break;
H
Herbert Xu 已提交
3260 3261
	}

3262
	return ret;
3263 3264 3265
}
EXPORT_SYMBOL(napi_skb_finish);

3266 3267 3268 3269
void skb_gro_reset_offset(struct sk_buff *skb)
{
	NAPI_GRO_CB(skb)->data_offset = 0;
	NAPI_GRO_CB(skb)->frag0 = NULL;
3270
	NAPI_GRO_CB(skb)->frag0_len = 0;
3271

3272
	if (skb->mac_header == skb->tail &&
3273
	    !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3274 3275 3276
		NAPI_GRO_CB(skb)->frag0 =
			page_address(skb_shinfo(skb)->frags[0].page) +
			skb_shinfo(skb)->frags[0].page_offset;
3277 3278
		NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
	}
3279 3280 3281
}
EXPORT_SYMBOL(skb_gro_reset_offset);

3282
gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3283
{
3284 3285
	skb_gro_reset_offset(skb);

3286
	return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3287 3288 3289
}
EXPORT_SYMBOL(napi_gro_receive);

3290 3291 3292 3293 3294 3295 3296 3297 3298
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);

3299
struct sk_buff *napi_get_frags(struct napi_struct *napi)
H
Herbert Xu 已提交
3300 3301 3302 3303
{
	struct sk_buff *skb = napi->skb;

	if (!skb) {
3304 3305 3306
		skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
		if (skb)
			napi->skb = skb;
3307
	}
3308 3309
	return skb;
}
3310
EXPORT_SYMBOL(napi_get_frags);
3311

3312 3313
gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
			       gro_result_t ret)
3314
{
3315 3316
	switch (ret) {
	case GRO_NORMAL:
3317
	case GRO_HELD:
3318
		skb->protocol = eth_type_trans(skb, skb->dev);
3319

3320 3321 3322 3323
		if (ret == GRO_HELD)
			skb_gro_pull(skb, -ETH_HLEN);
		else if (netif_receive_skb(skb))
			ret = GRO_DROP;
3324
		break;
H
Herbert Xu 已提交
3325

3326 3327 3328 3329
	case GRO_DROP:
	case GRO_MERGED_FREE:
		napi_reuse_skb(napi, skb);
		break;
3330 3331 3332

	case GRO_MERGED:
		break;
3333
	}
H
Herbert Xu 已提交
3334

3335
	return ret;
H
Herbert Xu 已提交
3336
}
3337 3338
EXPORT_SYMBOL(napi_frags_finish);

3339 3340 3341 3342
struct sk_buff *napi_frags_skb(struct napi_struct *napi)
{
	struct sk_buff *skb = napi->skb;
	struct ethhdr *eth;
3343 3344
	unsigned int hlen;
	unsigned int off;
3345 3346 3347 3348 3349 3350

	napi->skb = NULL;

	skb_reset_mac_header(skb);
	skb_gro_reset_offset(skb);

3351 3352 3353 3354 3355 3356 3357 3358 3359 3360
	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;
		}
3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375
	}

	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);

3376
gro_result_t napi_gro_frags(struct napi_struct *napi)
3377
{
3378
	struct sk_buff *skb = napi_frags_skb(napi);
3379 3380

	if (!skb)
3381
		return GRO_DROP;
3382 3383 3384

	return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
}
H
Herbert Xu 已提交
3385 3386
EXPORT_SYMBOL(napi_gro_frags);

3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414
/*
 * net_rps_action sends any pending IPI's for rps.
 * Note: called with local irq disabled, but exits with local irq enabled.
 */
static void net_rps_action_and_irq_enable(struct softnet_data *sd)
{
#ifdef CONFIG_RPS
	struct softnet_data *remsd = sd->rps_ipi_list;

	if (remsd) {
		sd->rps_ipi_list = NULL;

		local_irq_enable();

		/* Send pending IPI's to kick RPS processing on remote cpus. */
		while (remsd) {
			struct softnet_data *next = remsd->rps_ipi_next;

			if (cpu_online(remsd->cpu))
				__smp_call_function_single(remsd->cpu,
							   &remsd->csd, 0);
			remsd = next;
		}
	} else
#endif
		local_irq_enable();
}

3415
static int process_backlog(struct napi_struct *napi, int quota)
L
Linus Torvalds 已提交
3416 3417
{
	int work = 0;
E
Eric Dumazet 已提交
3418
	struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
L
Linus Torvalds 已提交
3419

3420 3421 3422 3423 3424 3425 3426 3427 3428
#ifdef CONFIG_RPS
	/* Check if we have pending ipi, its better to send them now,
	 * not waiting net_rx_action() end.
	 */
	if (sd->rps_ipi_list) {
		local_irq_disable();
		net_rps_action_and_irq_enable(sd);
	}
#endif
3429
	napi->weight = weight_p;
3430 3431
	local_irq_disable();
	while (work < quota) {
L
Linus Torvalds 已提交
3432
		struct sk_buff *skb;
3433 3434 3435 3436 3437 3438
		unsigned int qlen;

		while ((skb = __skb_dequeue(&sd->process_queue))) {
			local_irq_enable();
			__netif_receive_skb(skb);
			local_irq_disable();
3439 3440 3441 3442 3443
			input_queue_head_incr(sd);
			if (++work >= quota) {
				local_irq_enable();
				return work;
			}
3444
		}
L
Linus Torvalds 已提交
3445

E
Eric Dumazet 已提交
3446
		rps_lock(sd);
3447
		qlen = skb_queue_len(&sd->input_pkt_queue);
3448
		if (qlen)
3449 3450
			skb_queue_splice_tail_init(&sd->input_pkt_queue,
						   &sd->process_queue);
3451

3452
		if (qlen < quota - work) {
E
Eric Dumazet 已提交
3453 3454 3455 3456 3457 3458 3459 3460 3461 3462
			/*
			 * Inline a custom version of __napi_complete().
			 * only current cpu owns and manipulates this napi,
			 * and NAPI_STATE_SCHED is the only possible flag set on backlog.
			 * we can use a plain write instead of clear_bit(),
			 * and we dont need an smp_mb() memory barrier.
			 */
			list_del(&napi->poll_list);
			napi->state = 0;

3463
			quota = work + qlen;
3464
		}
E
Eric Dumazet 已提交
3465
		rps_unlock(sd);
3466 3467
	}
	local_irq_enable();
L
Linus Torvalds 已提交
3468

3469 3470
	return work;
}
L
Linus Torvalds 已提交
3471

3472 3473
/**
 * __napi_schedule - schedule for receive
3474
 * @n: entry to schedule
3475 3476 3477
 *
 * The entry's receive function will be scheduled to run
 */
H
Harvey Harrison 已提交
3478
void __napi_schedule(struct napi_struct *n)
3479 3480
{
	unsigned long flags;
L
Linus Torvalds 已提交
3481

3482
	local_irq_save(flags);
E
Eric Dumazet 已提交
3483
	____napi_schedule(&__get_cpu_var(softnet_data), n);
3484
	local_irq_restore(flags);
L
Linus Torvalds 已提交
3485
}
3486 3487
EXPORT_SYMBOL(__napi_schedule);

3488 3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520
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);
3521
	napi->gro_count = 0;
3522
	napi->gro_list = NULL;
H
Herbert Xu 已提交
3523
	napi->skb = NULL;
3524 3525 3526 3527
	napi->poll = poll;
	napi->weight = weight;
	list_add(&napi->dev_list, &dev->napi_list);
	napi->dev = dev;
H
Herbert Xu 已提交
3528
#ifdef CONFIG_NETPOLL
3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539
	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;

3540
	list_del_init(&napi->dev_list);
3541
	napi_free_frags(napi);
3542 3543 3544 3545 3546 3547 3548 3549

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

	napi->gro_list = NULL;
3550
	napi->gro_count = 0;
3551 3552 3553
}
EXPORT_SYMBOL(netif_napi_del);

L
Linus Torvalds 已提交
3554 3555
static void net_rx_action(struct softirq_action *h)
{
3556
	struct softnet_data *sd = &__get_cpu_var(softnet_data);
3557
	unsigned long time_limit = jiffies + 2;
3558
	int budget = netdev_budget;
3559 3560
	void *have;

L
Linus Torvalds 已提交
3561 3562
	local_irq_disable();

3563
	while (!list_empty(&sd->poll_list)) {
3564 3565
		struct napi_struct *n;
		int work, weight;
L
Linus Torvalds 已提交
3566

3567
		/* If softirq window is exhuasted then punt.
3568 3569
		 * Allow this to run for 2 jiffies since which will allow
		 * an average latency of 1.5/HZ.
3570
		 */
3571
		if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
L
Linus Torvalds 已提交
3572 3573 3574 3575
			goto softnet_break;

		local_irq_enable();

3576 3577 3578 3579 3580
		/* 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.
		 */
3581
		n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
L
Linus Torvalds 已提交
3582

3583 3584 3585 3586
		have = netpoll_poll_lock(n);

		weight = n->weight;

3587 3588 3589 3590 3591 3592 3593
		/* 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;
3594
		if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3595
			work = n->poll(n, weight);
3596 3597
			trace_napi_poll(n);
		}
3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609

		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.
		 */
3610
		if (unlikely(work == weight)) {
3611 3612 3613 3614 3615
			if (unlikely(napi_disable_pending(n))) {
				local_irq_enable();
				napi_complete(n);
				local_irq_disable();
			} else
3616
				list_move_tail(&n->poll_list, &sd->poll_list);
3617
		}
3618 3619

		netpoll_poll_unlock(have);
L
Linus Torvalds 已提交
3620 3621
	}
out:
3622
	net_rps_action_and_irq_enable(sd);
T
Tom Herbert 已提交
3623

3624 3625 3626 3627 3628
#ifdef CONFIG_NET_DMA
	/*
	 * There may not be any more sk_buffs coming right now, so push
	 * any pending DMA copies to hardware
	 */
3629
	dma_issue_pending_all();
3630
#endif
3631

L
Linus Torvalds 已提交
3632 3633 3634
	return;

softnet_break:
C
Changli Gao 已提交
3635
	sd->time_squeeze++;
L
Linus Torvalds 已提交
3636 3637 3638 3639
	__raise_softirq_irqoff(NET_RX_SOFTIRQ);
	goto out;
}

E
Eric Dumazet 已提交
3640
static gifconf_func_t *gifconf_list[NPROTO];
L
Linus Torvalds 已提交
3641 3642 3643 3644 3645 3646 3647 3648 3649 3650

/**
 *	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
3651
int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
L
Linus Torvalds 已提交
3652 3653 3654 3655 3656 3657
{
	if (family >= NPROTO)
		return -EINVAL;
	gifconf_list[family] = gifconf;
	return 0;
}
E
Eric Dumazet 已提交
3658
EXPORT_SYMBOL(register_gifconf);
L
Linus Torvalds 已提交
3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671


/*
 *	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
 */

3672
static int dev_ifname(struct net *net, struct ifreq __user *arg)
L
Linus Torvalds 已提交
3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683
{
	struct net_device *dev;
	struct ifreq ifr;

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

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

3684 3685
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
L
Linus Torvalds 已提交
3686
	if (!dev) {
3687
		rcu_read_unlock();
L
Linus Torvalds 已提交
3688 3689 3690 3691
		return -ENODEV;
	}

	strcpy(ifr.ifr_name, dev->name);
3692
	rcu_read_unlock();
L
Linus Torvalds 已提交
3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704

	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'.
 */

3705
static int dev_ifconf(struct net *net, char __user *arg)
L
Linus Torvalds 已提交
3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728
{
	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;
3729
	for_each_netdev(net, dev) {
L
Linus Torvalds 已提交
3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742
		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;
			}
		}
3743
	}
L
Linus Torvalds 已提交
3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760

	/*
	 *	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.
 */
3761
void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3762
	__acquires(RCU)
L
Linus Torvalds 已提交
3763
{
3764
	struct net *net = seq_file_net(seq);
3765
	loff_t off;
L
Linus Torvalds 已提交
3766 3767
	struct net_device *dev;

3768
	rcu_read_lock();
3769 3770
	if (!*pos)
		return SEQ_START_TOKEN;
L
Linus Torvalds 已提交
3771

3772
	off = 1;
3773
	for_each_netdev_rcu(net, dev)
3774 3775
		if (off++ == *pos)
			return dev;
L
Linus Torvalds 已提交
3776

3777
	return NULL;
L
Linus Torvalds 已提交
3778 3779 3780 3781
}

void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
3782 3783 3784 3785
	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
3786
	++*pos;
3787
	return rcu_dereference(dev);
L
Linus Torvalds 已提交
3788 3789 3790
}

void dev_seq_stop(struct seq_file *seq, void *v)
3791
	__releases(RCU)
L
Linus Torvalds 已提交
3792
{
3793
	rcu_read_unlock();
L
Linus Torvalds 已提交
3794 3795 3796 3797
}

static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
3798 3799
	struct rtnl_link_stats64 temp;
	const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
L
Linus Torvalds 已提交
3800

3801 3802
	seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
		   "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817
		   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
3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836
}

/*
 *	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;
}

C
Changli Gao 已提交
3837
static struct softnet_data *softnet_get_online(loff_t *pos)
L
Linus Torvalds 已提交
3838
{
C
Changli Gao 已提交
3839
	struct softnet_data *sd = NULL;
L
Linus Torvalds 已提交
3840

3841
	while (*pos < nr_cpu_ids)
3842
		if (cpu_online(*pos)) {
C
Changli Gao 已提交
3843
			sd = &per_cpu(softnet_data, *pos);
L
Linus Torvalds 已提交
3844 3845 3846
			break;
		} else
			++*pos;
C
Changli Gao 已提交
3847
	return sd;
L
Linus Torvalds 已提交
3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866
}

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)
{
C
Changli Gao 已提交
3867
	struct softnet_data *sd = v;
L
Linus Torvalds 已提交
3868

T
Tom Herbert 已提交
3869
	seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
C
Changli Gao 已提交
3870
		   sd->processed, sd->dropped, sd->time_squeeze, 0,
3871
		   0, 0, 0, 0, /* was fastroute */
C
Changli Gao 已提交
3872
		   sd->cpu_collision, sd->received_rps);
L
Linus Torvalds 已提交
3873 3874 3875
	return 0;
}

3876
static const struct seq_operations dev_seq_ops = {
L
Linus Torvalds 已提交
3877 3878 3879 3880 3881 3882 3883 3884
	.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)
{
3885 3886
	return seq_open_net(inode, file, &dev_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
3887 3888
}

3889
static const struct file_operations dev_seq_fops = {
L
Linus Torvalds 已提交
3890 3891 3892 3893
	.owner	 = THIS_MODULE,
	.open    = dev_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
3894
	.release = seq_release_net,
L
Linus Torvalds 已提交
3895 3896
};

3897
static const struct seq_operations softnet_seq_ops = {
L
Linus Torvalds 已提交
3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908
	.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);
}

3909
static const struct file_operations softnet_seq_fops = {
L
Linus Torvalds 已提交
3910 3911 3912 3913 3914 3915 3916
	.owner	 = THIS_MODULE,
	.open    = softnet_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release,
};

3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928
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;
	}

3929
	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3930 3931 3932 3933 3934 3935 3936 3937 3938 3939
		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)
3940
	__acquires(RCU)
3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963
{
	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
3964
		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3965 3966

	while (nxt == &ptype_base[hash]) {
3967
		if (++hash >= PTYPE_HASH_SIZE)
3968 3969 3970 3971 3972 3973 3974 3975
			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)
3976
	__releases(RCU)
3977 3978 3979 3980 3981 3982 3983 3984 3985 3986
{
	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");
3987
	else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3988 3989 3990 3991 3992
		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
3993 3994
		seq_printf(seq, " %-8s %pF\n",
			   pt->dev ? pt->dev->name : "", pt->func);
3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008
	}

	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)
{
4009 4010
	return seq_open_net(inode, file, &ptype_seq_ops,
			sizeof(struct seq_net_private));
4011 4012 4013 4014 4015 4016 4017
}

static const struct file_operations ptype_seq_fops = {
	.owner	 = THIS_MODULE,
	.open    = ptype_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
4018
	.release = seq_release_net,
4019 4020 4021
};


4022
static int __net_init dev_proc_net_init(struct net *net)
L
Linus Torvalds 已提交
4023 4024 4025
{
	int rc = -ENOMEM;

4026
	if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
L
Linus Torvalds 已提交
4027
		goto out;
4028
	if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
L
Linus Torvalds 已提交
4029
		goto out_dev;
4030
	if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4031
		goto out_softnet;
4032

4033
	if (wext_proc_init(net))
4034
		goto out_ptype;
L
Linus Torvalds 已提交
4035 4036 4037
	rc = 0;
out:
	return rc;
4038
out_ptype:
4039
	proc_net_remove(net, "ptype");
L
Linus Torvalds 已提交
4040
out_softnet:
4041
	proc_net_remove(net, "softnet_stat");
L
Linus Torvalds 已提交
4042
out_dev:
4043
	proc_net_remove(net, "dev");
L
Linus Torvalds 已提交
4044 4045
	goto out;
}
4046

4047
static void __net_exit dev_proc_net_exit(struct net *net)
4048 4049 4050 4051 4052 4053 4054 4055
{
	wext_proc_exit(net);

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

4056
static struct pernet_operations __net_initdata dev_proc_ops = {
4057 4058 4059 4060 4061 4062 4063 4064
	.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
4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093
#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;
4094

E
Eric Dumazet 已提交
4095 4096
	if (old) {
		synchronize_net();
L
Linus Torvalds 已提交
4097
		dev_put(old);
E
Eric Dumazet 已提交
4098
	}
L
Linus Torvalds 已提交
4099 4100 4101 4102 4103 4104 4105 4106
	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
4107
EXPORT_SYMBOL(netdev_set_master);
L
Linus Torvalds 已提交
4108

4109 4110
static void dev_change_rx_flags(struct net_device *dev, int flags)
{
4111 4112 4113 4114
	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);
4115 4116
}

4117
static int __dev_set_promiscuity(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
4118 4119
{
	unsigned short old_flags = dev->flags;
4120 4121
	uid_t uid;
	gid_t gid;
L
Linus Torvalds 已提交
4122

4123 4124
	ASSERT_RTNL();

4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141
	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;
		}
	}
4142
	if (dev->flags != old_flags) {
L
Linus Torvalds 已提交
4143 4144
		printk(KERN_INFO "device %s %s promiscuous mode\n",
		       dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4145
							       "left");
4146 4147
		if (audit_enabled) {
			current_uid_gid(&uid, &gid);
4148 4149 4150 4151 4152 4153
			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),
4154
				uid, gid,
4155
				audit_get_sessionid(current));
4156
		}
4157

4158
		dev_change_rx_flags(dev, IFF_PROMISC);
L
Linus Torvalds 已提交
4159
	}
4160
	return 0;
L
Linus Torvalds 已提交
4161 4162
}

4163 4164 4165 4166 4167 4168 4169 4170 4171
/**
 *	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.
4172
 *	Return 0 if successful or a negative errno code on error.
4173
 */
4174
int dev_set_promiscuity(struct net_device *dev, int inc)
4175 4176
{
	unsigned short old_flags = dev->flags;
4177
	int err;
4178

4179
	err = __dev_set_promiscuity(dev, inc);
4180
	if (err < 0)
4181
		return err;
4182 4183
	if (dev->flags != old_flags)
		dev_set_rx_mode(dev);
4184
	return err;
4185
}
E
Eric Dumazet 已提交
4186
EXPORT_SYMBOL(dev_set_promiscuity);
4187

L
Linus Torvalds 已提交
4188 4189 4190 4191 4192 4193 4194 4195 4196 4197
/**
 *	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.
4198
 *	Return 0 if successful or a negative errno code on error.
L
Linus Torvalds 已提交
4199 4200
 */

4201
int dev_set_allmulti(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
4202 4203 4204
{
	unsigned short old_flags = dev->flags;

4205 4206
	ASSERT_RTNL();

L
Linus Torvalds 已提交
4207
	dev->flags |= IFF_ALLMULTI;
4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223
	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;
		}
	}
4224
	if (dev->flags ^ old_flags) {
4225
		dev_change_rx_flags(dev, IFF_ALLMULTI);
4226
		dev_set_rx_mode(dev);
4227
	}
4228
	return 0;
4229
}
E
Eric Dumazet 已提交
4230
EXPORT_SYMBOL(dev_set_allmulti);
4231 4232 4233 4234

/*
 *	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
4235
 *	filtering it is put in promiscuous mode while unicast addresses
4236 4237 4238 4239
 *	are present.
 */
void __dev_set_rx_mode(struct net_device *dev)
{
4240 4241
	const struct net_device_ops *ops = dev->netdev_ops;

4242 4243 4244 4245 4246
	/* dev_open will call this function so the list will stay sane. */
	if (!(dev->flags&IFF_UP))
		return;

	if (!netif_device_present(dev))
4247
		return;
4248

4249 4250
	if (ops->ndo_set_rx_mode)
		ops->ndo_set_rx_mode(dev);
4251 4252 4253 4254
	else {
		/* Unicast addresses changes may only happen under the rtnl,
		 * therefore calling __dev_set_promiscuity here is safe.
		 */
4255
		if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4256 4257
			__dev_set_promiscuity(dev, 1);
			dev->uc_promisc = 1;
4258
		} else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4259 4260 4261 4262
			__dev_set_promiscuity(dev, -1);
			dev->uc_promisc = 0;
		}

4263 4264
		if (ops->ndo_set_multicast_list)
			ops->ndo_set_multicast_list(dev);
4265 4266 4267 4268 4269
	}
}

void dev_set_rx_mode(struct net_device *dev)
{
4270
	netif_addr_lock_bh(dev);
4271
	__dev_set_rx_mode(dev);
4272
	netif_addr_unlock_bh(dev);
L
Linus Torvalds 已提交
4273 4274
}

4275 4276 4277 4278 4279 4280
/**
 *	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
4281 4282 4283 4284 4285 4286
unsigned dev_get_flags(const struct net_device *dev)
{
	unsigned flags;

	flags = (dev->flags & ~(IFF_PROMISC |
				IFF_ALLMULTI |
S
Stefan Rompf 已提交
4287 4288 4289
				IFF_RUNNING |
				IFF_LOWER_UP |
				IFF_DORMANT)) |
L
Linus Torvalds 已提交
4290 4291 4292
		(dev->gflags & (IFF_PROMISC |
				IFF_ALLMULTI));

S
Stefan Rompf 已提交
4293 4294 4295 4296 4297 4298 4299 4300
	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
4301 4302 4303

	return flags;
}
E
Eric Dumazet 已提交
4304
EXPORT_SYMBOL(dev_get_flags);
L
Linus Torvalds 已提交
4305

4306
int __dev_change_flags(struct net_device *dev, unsigned int flags)
L
Linus Torvalds 已提交
4307 4308
{
	int old_flags = dev->flags;
4309
	int ret;
L
Linus Torvalds 已提交
4310

4311 4312
	ASSERT_RTNL();

L
Linus Torvalds 已提交
4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326
	/*
	 *	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.
	 */

4327 4328
	if ((old_flags ^ flags) & IFF_MULTICAST)
		dev_change_rx_flags(dev, IFF_MULTICAST);
4329

4330
	dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
4331 4332 4333 4334 4335 4336 4337 4338 4339

	/*
	 *	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  ? */
4340
		ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
L
Linus Torvalds 已提交
4341 4342

		if (!ret)
4343
			dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
4344 4345 4346
	}

	if ((flags ^ dev->gflags) & IFF_PROMISC) {
E
Eric Dumazet 已提交
4347 4348
		int inc = (flags & IFF_PROMISC) ? 1 : -1;

L
Linus Torvalds 已提交
4349 4350 4351 4352 4353 4354 4355 4356 4357
		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
4358 4359
		int inc = (flags & IFF_ALLMULTI) ? 1 : -1;

L
Linus Torvalds 已提交
4360 4361 4362 4363
		dev->gflags ^= IFF_ALLMULTI;
		dev_set_allmulti(dev, inc);
	}

4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400
	return ret;
}

void __dev_notify_flags(struct net_device *dev, unsigned int old_flags)
{
	unsigned int changes = dev->flags ^ old_flags;

	if (changes & IFF_UP) {
		if (dev->flags & IFF_UP)
			call_netdevice_notifiers(NETDEV_UP, dev);
		else
			call_netdevice_notifiers(NETDEV_DOWN, dev);
	}

	if (dev->flags & IFF_UP &&
	    (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE)))
		call_netdevice_notifiers(NETDEV_CHANGE, dev);
}

/**
 *	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.
 */
int dev_change_flags(struct net_device *dev, unsigned flags)
{
	int ret, changes;
	int old_flags = dev->flags;

	ret = __dev_change_flags(dev, flags);
	if (ret < 0)
		return ret;

	changes = old_flags ^ dev->flags;
4401 4402
	if (changes)
		rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
L
Linus Torvalds 已提交
4403

4404
	__dev_notify_flags(dev, old_flags);
L
Linus Torvalds 已提交
4405 4406
	return ret;
}
E
Eric Dumazet 已提交
4407
EXPORT_SYMBOL(dev_change_flags);
L
Linus Torvalds 已提交
4408

4409 4410 4411 4412 4413 4414 4415
/**
 *	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
4416 4417
int dev_set_mtu(struct net_device *dev, int new_mtu)
{
4418
	const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431
	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;
4432 4433
	if (ops->ndo_change_mtu)
		err = ops->ndo_change_mtu(dev, new_mtu);
L
Linus Torvalds 已提交
4434 4435
	else
		dev->mtu = new_mtu;
4436

L
Linus Torvalds 已提交
4437
	if (!err && dev->flags & IFF_UP)
4438
		call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
L
Linus Torvalds 已提交
4439 4440
	return err;
}
E
Eric Dumazet 已提交
4441
EXPORT_SYMBOL(dev_set_mtu);
L
Linus Torvalds 已提交
4442

4443 4444 4445 4446 4447 4448 4449
/**
 *	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
4450 4451
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
{
4452
	const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
4453 4454
	int err;

4455
	if (!ops->ndo_set_mac_address)
L
Linus Torvalds 已提交
4456 4457 4458 4459 4460
		return -EOPNOTSUPP;
	if (sa->sa_family != dev->type)
		return -EINVAL;
	if (!netif_device_present(dev))
		return -ENODEV;
4461
	err = ops->ndo_set_mac_address(dev, sa);
L
Linus Torvalds 已提交
4462
	if (!err)
4463
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
L
Linus Torvalds 已提交
4464 4465
	return err;
}
E
Eric Dumazet 已提交
4466
EXPORT_SYMBOL(dev_set_mac_address);
L
Linus Torvalds 已提交
4467 4468

/*
E
Eric Dumazet 已提交
4469
 *	Perform the SIOCxIFxxx calls, inside rcu_read_lock()
L
Linus Torvalds 已提交
4470
 */
4471
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
L
Linus Torvalds 已提交
4472 4473
{
	int err;
E
Eric Dumazet 已提交
4474
	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
L
Linus Torvalds 已提交
4475 4476 4477 4478 4479

	if (!dev)
		return -ENODEV;

	switch (cmd) {
E
Eric Dumazet 已提交
4480 4481 4482
	case SIOCGIFFLAGS:	/* Get interface flags */
		ifr->ifr_flags = (short) dev_get_flags(dev);
		return 0;
L
Linus Torvalds 已提交
4483

E
Eric Dumazet 已提交
4484 4485 4486 4487
	case SIOCGIFMETRIC:	/* Get the metric on the interface
				   (currently unused) */
		ifr->ifr_metric = 0;
		return 0;
L
Linus Torvalds 已提交
4488

E
Eric Dumazet 已提交
4489 4490 4491
	case SIOCGIFMTU:	/* Get the MTU of a device */
		ifr->ifr_mtu = dev->mtu;
		return 0;
L
Linus Torvalds 已提交
4492

E
Eric Dumazet 已提交
4493 4494 4495 4496 4497 4498 4499 4500
	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
4501

E
Eric Dumazet 已提交
4502 4503 4504
	case SIOCGIFSLAVE:
		err = -EINVAL;
		break;
4505

E
Eric Dumazet 已提交
4506 4507 4508 4509 4510 4511 4512 4513
	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;
4514

E
Eric Dumazet 已提交
4515 4516 4517
	case SIOCGIFINDEX:
		ifr->ifr_ifindex = dev->ifindex;
		return 0;
4518

E
Eric Dumazet 已提交
4519 4520 4521
	case SIOCGIFTXQLEN:
		ifr->ifr_qlen = dev->tx_queue_len;
		return 0;
4522

E
Eric Dumazet 已提交
4523 4524 4525 4526 4527 4528 4529
	default:
		/* dev_ioctl() should ensure this case
		 * is never reached
		 */
		WARN_ON(1);
		err = -EINVAL;
		break;
4530 4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541

	}
	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
4542
	const struct net_device_ops *ops;
4543 4544 4545 4546

	if (!dev)
		return -ENODEV;

J
Jarek Poplawski 已提交
4547 4548
	ops = dev->netdev_ops;

4549
	switch (cmd) {
E
Eric Dumazet 已提交
4550 4551
	case SIOCSIFFLAGS:	/* Set interface flags */
		return dev_change_flags(dev, ifr->ifr_flags);
4552

E
Eric Dumazet 已提交
4553 4554 4555
	case SIOCSIFMETRIC:	/* Set the metric on the interface
				   (currently unused) */
		return -EOPNOTSUPP;
4556

E
Eric Dumazet 已提交
4557 4558
	case SIOCSIFMTU:	/* Set the MTU of a device */
		return dev_set_mtu(dev, ifr->ifr_mtu);
L
Linus Torvalds 已提交
4559

E
Eric Dumazet 已提交
4560 4561
	case SIOCSIFHWADDR:
		return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
L
Linus Torvalds 已提交
4562

E
Eric Dumazet 已提交
4563 4564 4565 4566 4567 4568 4569
	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
4570

E
Eric Dumazet 已提交
4571 4572
	case SIOCSIFMAP:
		if (ops->ndo_set_config) {
L
Linus Torvalds 已提交
4573 4574
			if (!netif_device_present(dev))
				return -ENODEV;
E
Eric Dumazet 已提交
4575 4576 4577
			return ops->ndo_set_config(dev, &ifr->ifr_map);
		}
		return -EOPNOTSUPP;
L
Linus Torvalds 已提交
4578

E
Eric Dumazet 已提交
4579 4580 4581 4582 4583 4584
	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;
4585
		return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
E
Eric Dumazet 已提交
4586 4587 4588 4589 4590 4591 4592

	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;
4593
		return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
L
Linus Torvalds 已提交
4594

E
Eric Dumazet 已提交
4595 4596 4597 4598 4599
	case SIOCSIFTXQLEN:
		if (ifr->ifr_qlen < 0)
			return -EINVAL;
		dev->tx_queue_len = ifr->ifr_qlen;
		return 0;
L
Linus Torvalds 已提交
4600

E
Eric Dumazet 已提交
4601 4602 4603
	case SIOCSIFNAME:
		ifr->ifr_newname[IFNAMSIZ-1] = '\0';
		return dev_change_name(dev, ifr->ifr_newname);
L
Linus Torvalds 已提交
4604

E
Eric Dumazet 已提交
4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632
	/*
	 *	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
4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644

	}
	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
4645
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
4646 4647 4648 4649 4650 4651 4652 4653 4654
 *	@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.
 */

4655
int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
L
Linus Torvalds 已提交
4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666
{
	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) {
4667
		rtnl_lock();
4668
		ret = dev_ifconf(net, (char __user *) arg);
4669
		rtnl_unlock();
L
Linus Torvalds 已提交
4670 4671 4672
		return ret;
	}
	if (cmd == SIOCGIFNAME)
4673
		return dev_ifname(net, (struct ifreq __user *)arg);
L
Linus Torvalds 已提交
4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688

	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
4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703
	/*
	 *	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
4704
		rcu_read_lock();
E
Eric Dumazet 已提交
4705
		ret = dev_ifsioc_locked(net, &ifr, cmd);
E
Eric Dumazet 已提交
4706
		rcu_read_unlock();
E
Eric Dumazet 已提交
4707 4708 4709 4710 4711 4712 4713 4714
		if (!ret) {
			if (colon)
				*colon = ':';
			if (copy_to_user(arg, &ifr,
					 sizeof(struct ifreq)))
				ret = -EFAULT;
		}
		return ret;
L
Linus Torvalds 已提交
4715

E
Eric Dumazet 已提交
4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728
	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
4729

E
Eric Dumazet 已提交
4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743 4744 4745 4746 4747 4748 4749 4750 4751 4752
	/*
	 *	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
4753

E
Eric Dumazet 已提交
4754 4755 4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803 4804
	/*
	 *	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)) {
4805
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
4806
			rtnl_lock();
4807
			ret = dev_ifsioc(net, &ifr, cmd);
L
Linus Torvalds 已提交
4808
			rtnl_unlock();
E
Eric Dumazet 已提交
4809 4810 4811
			if (!ret && copy_to_user(arg, &ifr,
						 sizeof(struct ifreq)))
				ret = -EFAULT;
L
Linus Torvalds 已提交
4812
			return ret;
E
Eric Dumazet 已提交
4813 4814 4815 4816 4817
		}
		/* 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
4818 4819 4820 4821 4822 4823
	}
}


/**
 *	dev_new_index	-	allocate an ifindex
4824
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
4825 4826 4827 4828 4829
 *
 *	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.
 */
4830
static int dev_new_index(struct net *net)
L
Linus Torvalds 已提交
4831 4832 4833 4834 4835
{
	static int ifindex;
	for (;;) {
		if (++ifindex <= 0)
			ifindex = 1;
4836
		if (!__dev_get_by_index(net, ifindex))
L
Linus Torvalds 已提交
4837 4838 4839 4840 4841
			return ifindex;
	}
}

/* Delayed registration/unregisteration */
4842
static LIST_HEAD(net_todo_list);
L
Linus Torvalds 已提交
4843

4844
static void net_set_todo(struct net_device *dev)
L
Linus Torvalds 已提交
4845 4846 4847 4848
{
	list_add_tail(&dev->todo_list, &net_todo_list);
}

4849
static void rollback_registered_many(struct list_head *head)
4850
{
4851
	struct net_device *dev, *tmp;
4852

4853 4854 4855
	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

4856
	list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4857
		/* Some devices call without registering
4858 4859
		 * for initialization unwind. Remove those
		 * devices and proceed with the remaining.
4860 4861 4862 4863
		 */
		if (dev->reg_state == NETREG_UNINITIALIZED) {
			pr_debug("unregister_netdevice: device %s/%p never "
				 "was registered\n", dev->name, dev);
4864

4865
			WARN_ON(1);
4866 4867
			list_del(&dev->unreg_list);
			continue;
4868
		}
4869

4870
		BUG_ON(dev->reg_state != NETREG_REGISTERED);
4871

4872 4873
		/* If device is running, close it first. */
		dev_close(dev);
4874

4875 4876
		/* And unlink it from device chain. */
		unlist_netdevice(dev);
4877

4878 4879
		dev->reg_state = NETREG_UNREGISTERING;
	}
4880 4881 4882

	synchronize_net();

4883 4884 4885
	list_for_each_entry(dev, head, unreg_list) {
		/* Shutdown queueing discipline. */
		dev_shutdown(dev);
4886 4887


4888 4889 4890 4891
		/* Notify protocols, that we are about to destroy
		   this device. They should clean all the things.
		*/
		call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4892

4893 4894 4895 4896
		if (!dev->rtnl_link_ops ||
		    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
			rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);

4897 4898 4899
		/*
		 *	Flush the unicast and multicast chains
		 */
4900
		dev_uc_flush(dev);
4901
		dev_mc_flush(dev);
4902

4903 4904
		if (dev->netdev_ops->ndo_uninit)
			dev->netdev_ops->ndo_uninit(dev);
4905

4906 4907
		/* Notifier chain MUST detach us from master device. */
		WARN_ON(dev->master);
4908

4909 4910 4911
		/* Remove entries from kobject tree */
		netdev_unregister_kobject(dev);
	}
4912

4913
	/* Process any work delayed until the end of the batch */
4914
	dev = list_first_entry(head, struct net_device, unreg_list);
4915
	call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4916

4917
	rcu_barrier();
4918

4919
	list_for_each_entry(dev, head, unreg_list)
4920 4921 4922 4923 4924 4925 4926 4927 4928
		dev_put(dev);
}

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

	list_add(&dev->unreg_list, &single);
	rollback_registered_many(&single);
4929 4930
}

4931 4932 4933
static void __netdev_init_queue_locks_one(struct net_device *dev,
					  struct netdev_queue *dev_queue,
					  void *_unused)
4934 4935
{
	spin_lock_init(&dev_queue->_xmit_lock);
4936
	netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4937 4938 4939 4940 4941
	dev_queue->xmit_lock_owner = -1;
}

static void netdev_init_queue_locks(struct net_device *dev)
{
4942
	netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4943 4944
}

4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959 4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984
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);

4985 4986 4987 4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011
/**
 *	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);

5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039
static int netif_alloc_rx_queues(struct net_device *dev)
{
#ifdef CONFIG_RPS
	unsigned int i, count = dev->num_rx_queues;

	if (count) {
		struct netdev_rx_queue *rx;

		rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
		if (!rx) {
			pr_err("netdev: Unable to allocate %u rx queues.\n",
			       count);
			return -ENOMEM;
		}
		dev->_rx = rx;
		atomic_set(&rx->count, count);

		/*
		 * Set a pointer to first element in the array which holds the
		 * reference count.
		 */
		for (i = 0; i < count; i++)
			rx[i].first = rx;
	}
#endif
	return 0;
}

L
Linus Torvalds 已提交
5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059
/**
 *	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;
5060
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
5061 5062 5063 5064

	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

5065 5066
	might_sleep();

L
Linus Torvalds 已提交
5067 5068
	/* When net_device's are persistent, this will be fatal. */
	BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5069
	BUG_ON(!net);
L
Linus Torvalds 已提交
5070

5071
	spin_lock_init(&dev->addr_list_lock);
5072
	netdev_set_addr_lockdep_class(dev);
5073
	netdev_init_queue_locks(dev);
L
Linus Torvalds 已提交
5074 5075 5076

	dev->iflink = -1;

5077 5078 5079
	ret = netif_alloc_rx_queues(dev);
	if (ret)
		goto out;
T
Tom Herbert 已提交
5080

L
Linus Torvalds 已提交
5081
	/* Init, if this function is available */
5082 5083
	if (dev->netdev_ops->ndo_init) {
		ret = dev->netdev_ops->ndo_init(dev);
L
Linus Torvalds 已提交
5084 5085 5086
		if (ret) {
			if (ret > 0)
				ret = -EIO;
5087
			goto out;
L
Linus Torvalds 已提交
5088 5089
		}
	}
5090

5091
	ret = dev_get_valid_name(dev, dev->name, 0);
5092
	if (ret)
5093
		goto err_uninit;
L
Linus Torvalds 已提交
5094

5095
	dev->ifindex = dev_new_index(net);
L
Linus Torvalds 已提交
5096 5097 5098
	if (dev->iflink == -1)
		dev->iflink = dev->ifindex;

5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113
	/* 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);
	}

5114
	dev->features = netdev_fix_features(dev->features, dev->name);
L
Linus Torvalds 已提交
5115

5116 5117 5118 5119
	/* Enable software GSO if SG is supported. */
	if (dev->features & NETIF_F_SG)
		dev->features |= NETIF_F_GSO;

5120 5121 5122
	/* Enable GRO and NETIF_F_HIGHDMA for vlans by default,
	 * vlan_dev_init() will do the dev->features check, so these features
	 * are enabled only if supported by underlying device.
5123
	 */
5124
	dev->vlan_features |= (NETIF_F_GRO | NETIF_F_HIGHDMA);
5125

5126 5127 5128 5129 5130
	ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		goto err_uninit;

5131
	ret = netdev_register_kobject(dev);
5132
	if (ret)
5133
		goto err_uninit;
5134 5135
	dev->reg_state = NETREG_REGISTERED;

L
Linus Torvalds 已提交
5136 5137 5138 5139 5140 5141 5142 5143 5144
	/*
	 *	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);
5145
	list_netdevice(dev);
L
Linus Torvalds 已提交
5146 5147

	/* Notify protocols, that a new device appeared. */
5148
	ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5149
	ret = notifier_to_errno(ret);
5150 5151 5152 5153
	if (ret) {
		rollback_registered(dev);
		dev->reg_state = NETREG_UNREGISTERED;
	}
5154 5155 5156 5157
	/*
	 *	Prevent userspace races by waiting until the network
	 *	device is fully setup before sending notifications.
	 */
5158 5159 5160
	if (!dev->rtnl_link_ops ||
	    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
		rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
L
Linus Torvalds 已提交
5161 5162 5163

out:
	return ret;
5164 5165

err_uninit:
5166 5167
	if (dev->netdev_ops->ndo_uninit)
		dev->netdev_ops->ndo_uninit(dev);
5168
	goto out;
L
Linus Torvalds 已提交
5169
}
E
Eric Dumazet 已提交
5170
EXPORT_SYMBOL(register_netdevice);
L
Linus Torvalds 已提交
5171

5172 5173 5174 5175 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 5206 5207 5208 5209 5210
/**
 *	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
5211 5212 5213 5214 5215 5216 5217 5218 5219
/**
 *	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.
 *
5220
 *	This is a wrapper around register_netdevice that takes the rtnl semaphore
L
Linus Torvalds 已提交
5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238
 *	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;
	}
5239

L
Linus Torvalds 已提交
5240 5241 5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255
	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
5256
 * call dev_put.
L
Linus Torvalds 已提交
5257 5258 5259 5260 5261
 */
static void netdev_wait_allrefs(struct net_device *dev)
{
	unsigned long rebroadcast_time, warning_time;

5262 5263
	linkwatch_forget_dev(dev);

L
Linus Torvalds 已提交
5264 5265 5266
	rebroadcast_time = warning_time = jiffies;
	while (atomic_read(&dev->refcnt) != 0) {
		if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5267
			rtnl_lock();
L
Linus Torvalds 已提交
5268 5269

			/* Rebroadcast unregister notification */
5270
			call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5271
			/* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5272
			 * should have already handle it the first time */
L
Linus Torvalds 已提交
5273 5274 5275 5276 5277 5278 5279 5280 5281 5282 5283 5284

			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();
			}

5285
			__rtnl_unlock();
L
Linus Torvalds 已提交
5286 5287 5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315

			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
5316
 * We are invoked by rtnl_unlock().
L
Linus Torvalds 已提交
5317
 * This allows us to deal with problems:
5318
 * 1) We can delete sysfs objects which invoke hotplug
L
Linus Torvalds 已提交
5319 5320 5321
 *    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
5322 5323 5324
 *
 * 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
5325 5326 5327
 */
void netdev_run_todo(void)
{
5328
	struct list_head list;
L
Linus Torvalds 已提交
5329 5330

	/* Snapshot list, allow later requests */
5331
	list_replace_init(&net_todo_list, &list);
H
Herbert Xu 已提交
5332 5333

	__rtnl_unlock();
5334

L
Linus Torvalds 已提交
5335 5336
	while (!list_empty(&list)) {
		struct net_device *dev
5337
			= list_first_entry(&list, struct net_device, todo_list);
L
Linus Torvalds 已提交
5338 5339
		list_del(&dev->todo_list);

5340 5341 5342 5343 5344 5345
		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
5346

5347
		dev->reg_state = NETREG_UNREGISTERED;
L
Linus Torvalds 已提交
5348

5349
		on_each_cpu(flush_backlog, dev, 1);
5350

5351
		netdev_wait_allrefs(dev);
L
Linus Torvalds 已提交
5352

5353 5354
		/* paranoia */
		BUG_ON(atomic_read(&dev->refcnt));
E
Eric Dumazet 已提交
5355
		WARN_ON(rcu_dereference_raw(dev->ip_ptr));
5356 5357
		WARN_ON(dev->ip6_ptr);
		WARN_ON(dev->dn_ptr);
L
Linus Torvalds 已提交
5358

5359 5360
		if (dev->destructor)
			dev->destructor(dev);
5361 5362 5363

		/* Free network device */
		kobject_put(&dev->dev.kobj);
L
Linus Torvalds 已提交
5364 5365 5366
	}
}

5367 5368 5369
/**
 *	dev_txq_stats_fold - fold tx_queues stats
 *	@dev: device to get statistics from
5370
 *	@stats: struct rtnl_link_stats64 to hold results
5371 5372
 */
void dev_txq_stats_fold(const struct net_device *dev,
5373
			struct rtnl_link_stats64 *stats)
5374
{
E
Eric Dumazet 已提交
5375
	u64 tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5376 5377 5378 5379 5380
	unsigned int i;
	struct netdev_queue *txq;

	for (i = 0; i < dev->num_tx_queues; i++) {
		txq = netdev_get_tx_queue(dev, i);
E
Eric Dumazet 已提交
5381
		spin_lock_bh(&txq->_xmit_lock);
5382 5383 5384
		tx_bytes   += txq->tx_bytes;
		tx_packets += txq->tx_packets;
		tx_dropped += txq->tx_dropped;
E
Eric Dumazet 已提交
5385
		spin_unlock_bh(&txq->_xmit_lock);
5386 5387 5388 5389 5390 5391 5392 5393 5394
	}
	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);

5395 5396 5397 5398 5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415
/* Convert net_device_stats to rtnl_link_stats64.  They have the same
 * fields in the same order, with only the type differing.
 */
static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
				    const struct net_device_stats *netdev_stats)
{
#if BITS_PER_LONG == 64
        BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
        memcpy(stats64, netdev_stats, sizeof(*stats64));
#else
	size_t i, n = sizeof(*stats64) / sizeof(u64);
	const unsigned long *src = (const unsigned long *)netdev_stats;
	u64 *dst = (u64 *)stats64;

	BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) !=
		     sizeof(*stats64) / sizeof(u64));
	for (i = 0; i < n; i++)
		dst[i] = src[i];
#endif
}

5416 5417 5418
/**
 *	dev_get_stats	- get network device statistics
 *	@dev: device to get statistics from
5419
 *	@storage: place to store stats
5420
 *
5421 5422 5423 5424
 *	Get network statistics from device. Return @storage.
 *	The device driver may provide its own method by setting
 *	dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
 *	otherwise the internal statistics structure is used.
5425
 */
5426 5427
struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
					struct rtnl_link_stats64 *storage)
5428
{
5429 5430
	const struct net_device_ops *ops = dev->netdev_ops;

5431 5432
	if (ops->ndo_get_stats64) {
		memset(storage, 0, sizeof(*storage));
5433 5434
		ops->ndo_get_stats64(dev, storage);
	} else if (ops->ndo_get_stats) {
5435
		netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5436 5437 5438
	} else {
		netdev_stats_to_stats64(storage, &dev->stats);
		dev_txq_stats_fold(dev, storage);
5439
	}
5440
	storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5441
	return storage;
R
Rusty Russell 已提交
5442
}
5443
EXPORT_SYMBOL(dev_get_stats);
R
Rusty Russell 已提交
5444

5445
static void netdev_init_one_queue(struct net_device *dev,
5446 5447
				  struct netdev_queue *queue,
				  void *_unused)
5448 5449 5450 5451
{
	queue->dev = dev;
}

5452 5453
static void netdev_init_queues(struct net_device *dev)
{
5454
	netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5455
	spin_lock_init(&dev->tx_global_lock);
5456 5457
}

5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470 5471 5472 5473 5474 5475 5476
struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
{
	struct netdev_queue *queue = dev_ingress_queue(dev);

#ifdef CONFIG_NET_CLS_ACT
	if (queue)
		return queue;
	queue = kzalloc(sizeof(*queue), GFP_KERNEL);
	if (!queue)
		return NULL;
	netdev_init_one_queue(dev, queue, NULL);
	__netdev_init_queue_locks_one(dev, queue, NULL);
	queue->qdisc = &noop_qdisc;
	queue->qdisc_sleeping = &noop_qdisc;
	rcu_assign_pointer(dev->ingress_queue, queue);
#endif
	return queue;
}

L
Linus Torvalds 已提交
5477
/**
5478
 *	alloc_netdev_mq - allocate network device
L
Linus Torvalds 已提交
5479 5480 5481
 *	@sizeof_priv:	size of private data to allocate space for
 *	@name:		device name format string
 *	@setup:		callback to initialize device
5482
 *	@queue_count:	the number of subqueues to allocate
L
Linus Torvalds 已提交
5483 5484
 *
 *	Allocates a struct net_device with private data area for driver use
5485 5486
 *	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
5487
 */
5488 5489
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
5490
{
5491
	struct netdev_queue *tx;
L
Linus Torvalds 已提交
5492
	struct net_device *dev;
5493
	size_t alloc_size;
5494
	struct net_device *p;
L
Linus Torvalds 已提交
5495

5496 5497
	BUG_ON(strlen(name) >= sizeof(dev->name));

5498
	alloc_size = sizeof(struct net_device);
5499 5500
	if (sizeof_priv) {
		/* ensure 32-byte alignment of private area */
5501
		alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5502 5503 5504
		alloc_size += sizeof_priv;
	}
	/* ensure 32-byte alignment of whole construct */
5505
	alloc_size += NETDEV_ALIGN - 1;
L
Linus Torvalds 已提交
5506

5507
	p = kzalloc(alloc_size, GFP_KERNEL);
L
Linus Torvalds 已提交
5508
	if (!p) {
5509
		printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
L
Linus Torvalds 已提交
5510 5511 5512
		return NULL;
	}

5513
	tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5514 5515 5516
	if (!tx) {
		printk(KERN_ERR "alloc_netdev: Unable to allocate "
		       "tx qdiscs.\n");
5517
		goto free_p;
5518 5519
	}

T
Tom Herbert 已提交
5520

5521
	dev = PTR_ALIGN(p, NETDEV_ALIGN);
L
Linus Torvalds 已提交
5522
	dev->padded = (char *)dev - (char *)p;
5523 5524

	if (dev_addr_init(dev))
5525
		goto free_tx;
5526

5527
	dev_mc_init(dev);
5528
	dev_uc_init(dev);
J
Jiri Pirko 已提交
5529

5530
	dev_net_set(dev, &init_net);
L
Linus Torvalds 已提交
5531

5532 5533
	dev->_tx = tx;
	dev->num_tx_queues = queue_count;
5534
	dev->real_num_tx_queues = queue_count;
5535

E
Eric Dumazet 已提交
5536
#ifdef CONFIG_RPS
T
Tom Herbert 已提交
5537
	dev->num_rx_queues = queue_count;
5538
	dev->real_num_rx_queues = queue_count;
E
Eric Dumazet 已提交
5539
#endif
T
Tom Herbert 已提交
5540

5541
	dev->gso_max_size = GSO_MAX_SIZE;
L
Linus Torvalds 已提交
5542

5543 5544
	netdev_init_queues(dev);

5545 5546
	INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
	dev->ethtool_ntuple_list.count = 0;
5547
	INIT_LIST_HEAD(&dev->napi_list);
5548
	INIT_LIST_HEAD(&dev->unreg_list);
5549
	INIT_LIST_HEAD(&dev->link_watch_list);
5550
	dev->priv_flags = IFF_XMIT_DST_RELEASE;
L
Linus Torvalds 已提交
5551 5552 5553
	setup(dev);
	strcpy(dev->name, name);
	return dev;
5554 5555 5556 5557 5558 5559

free_tx:
	kfree(tx);
free_p:
	kfree(p);
	return NULL;
L
Linus Torvalds 已提交
5560
}
5561
EXPORT_SYMBOL(alloc_netdev_mq);
L
Linus Torvalds 已提交
5562 5563 5564 5565 5566

/**
 *	free_netdev - free network device
 *	@dev: device
 *
5567 5568
 *	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
5569 5570 5571 5572
 *	If this is the last reference then it will be freed.
 */
void free_netdev(struct net_device *dev)
{
5573 5574
	struct napi_struct *p, *n;

5575 5576
	release_net(dev_net(dev));

5577 5578
	kfree(dev->_tx);

5579 5580
	kfree(rcu_dereference_raw(dev->ingress_queue));

5581 5582 5583
	/* Flush device addresses */
	dev_addr_flush(dev);

5584 5585 5586
	/* Clear ethtool n-tuple list */
	ethtool_ntuple_flush(dev);

5587 5588 5589
	list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
		netif_napi_del(p);

S
Stephen Hemminger 已提交
5590
	/*  Compatibility with error handling in drivers */
L
Linus Torvalds 已提交
5591 5592 5593 5594 5595 5596 5597 5598
	if (dev->reg_state == NETREG_UNINITIALIZED) {
		kfree((char *)dev - dev->padded);
		return;
	}

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

5599 5600
	/* will free via device release */
	put_device(&dev->dev);
L
Linus Torvalds 已提交
5601
}
E
Eric Dumazet 已提交
5602
EXPORT_SYMBOL(free_netdev);
5603

5604 5605 5606 5607 5608 5609
/**
 *	synchronize_net -  Synchronize with packet receive processing
 *
 *	Wait for packets currently being received to be done.
 *	Does not block later packets from starting.
 */
5610
void synchronize_net(void)
L
Linus Torvalds 已提交
5611 5612
{
	might_sleep();
5613
	synchronize_rcu();
L
Linus Torvalds 已提交
5614
}
E
Eric Dumazet 已提交
5615
EXPORT_SYMBOL(synchronize_net);
L
Linus Torvalds 已提交
5616 5617

/**
5618
 *	unregister_netdevice_queue - remove device from the kernel
L
Linus Torvalds 已提交
5619
 *	@dev: device
5620
 *	@head: list
5621
 *
L
Linus Torvalds 已提交
5622
 *	This function shuts down a device interface and removes it
5623
 *	from the kernel tables.
5624
 *	If head not NULL, device is queued to be unregistered later.
L
Linus Torvalds 已提交
5625 5626 5627 5628 5629
 *
 *	Callers must hold the rtnl semaphore.  You may want
 *	unregister_netdev() instead of this.
 */

5630
void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
L
Linus Torvalds 已提交
5631
{
5632 5633
	ASSERT_RTNL();

5634
	if (head) {
5635
		list_move_tail(&dev->unreg_list, head);
5636 5637 5638 5639 5640
	} else {
		rollback_registered(dev);
		/* Finish processing unregister after unlock */
		net_set_todo(dev);
	}
L
Linus Torvalds 已提交
5641
}
5642
EXPORT_SYMBOL(unregister_netdevice_queue);
L
Linus Torvalds 已提交
5643

5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657
/**
 *	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);
	}
}
5658
EXPORT_SYMBOL(unregister_netdevice_many);
5659

L
Linus Torvalds 已提交
5660 5661 5662 5663 5664
/**
 *	unregister_netdev - remove device from the kernel
 *	@dev: device
 *
 *	This function shuts down a device interface and removes it
5665
 *	from the kernel tables.
L
Linus Torvalds 已提交
5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678
 *
 *	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);

5679 5680 5681 5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710
/**
 *	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;

	/* 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;
5711
	if (net_eq(dev_net(dev), net))
5712 5713 5714 5715 5716 5717
		goto out;

	/* Pick the destination device name, and ensure
	 * we can use it in the destination network namespace.
	 */
	err = -EEXIST;
5718
	if (__dev_get_by_name(net, dev->name)) {
5719 5720 5721
		/* We get here if we can't use the current device name */
		if (!pat)
			goto out;
5722
		if (dev_get_valid_name(dev, pat, 1))
5723 5724 5725 5726 5727 5728 5729 5730
			goto out;
	}

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

	/* If device is running close it first. */
5731
	dev_close(dev);
5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743

	/* 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.
5744 5745 5746 5747

	   Note that dev->reg_state stays at NETREG_REGISTERED.
	   This is wanted because this way 8021q and macvlan know
	   the device is just moving and can keep their slaves up.
5748 5749
	*/
	call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5750
	call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5751 5752 5753 5754

	/*
	 *	Flush the unicast and multicast chains
	 */
5755
	dev_uc_flush(dev);
5756
	dev_mc_flush(dev);
5757 5758

	/* Actually switch the network namespace */
5759
	dev_net_set(dev, net);
5760 5761 5762 5763 5764 5765 5766 5767 5768

	/* 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;
	}

5769
	/* Fixup kobjects */
5770
	err = device_rename(&dev->dev, dev->name);
5771
	WARN_ON(err);
5772 5773 5774 5775 5776 5777 5778

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

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

5779 5780 5781 5782 5783 5784
	/*
	 *	Prevent userspace races by waiting until the network
	 *	device is fully setup before sending notifications.
	 */
	rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);

5785 5786 5787 5788 5789
	synchronize_net();
	err = 0;
out:
	return err;
}
5790
EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5791

L
Linus Torvalds 已提交
5792 5793 5794 5795 5796 5797 5798 5799 5800
static int dev_cpu_callback(struct notifier_block *nfb,
			    unsigned long action,
			    void *ocpu)
{
	struct sk_buff **list_skb;
	struct sk_buff *skb;
	unsigned int cpu, oldcpu = (unsigned long)ocpu;
	struct softnet_data *sd, *oldsd;

5801
	if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
L
Linus Torvalds 已提交
5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817
		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;

	/* Append output queue from offline CPU. */
5818 5819 5820 5821 5822 5823
	if (oldsd->output_queue) {
		*sd->output_queue_tailp = oldsd->output_queue;
		sd->output_queue_tailp = oldsd->output_queue_tailp;
		oldsd->output_queue = NULL;
		oldsd->output_queue_tailp = &oldsd->output_queue;
	}
L
Linus Torvalds 已提交
5824 5825 5826 5827 5828

	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	local_irq_enable();

	/* Process offline CPU's input_pkt_queue */
5829
	while ((skb = __skb_dequeue(&oldsd->process_queue))) {
L
Linus Torvalds 已提交
5830
		netif_rx(skb);
5831
		input_queue_head_incr(oldsd);
T
Tom Herbert 已提交
5832
	}
5833
	while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
5834
		netif_rx(skb);
5835 5836
		input_queue_head_incr(oldsd);
	}
L
Linus Torvalds 已提交
5837 5838 5839 5840 5841

	return NOTIFY_OK;
}


5842
/**
5843 5844 5845 5846
 *	netdev_increment_features - increment feature set by one
 *	@all: current feature set
 *	@one: new feature set
 *	@mask: mask feature set
5847 5848
 *
 *	Computes a new feature set after adding a device with feature set
5849 5850
 *	@one to the master device with current feature set @all.  Will not
 *	enable anything that is off in @mask. Returns the new feature set.
5851
 */
5852 5853 5854 5855
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
5856
	if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5857 5858 5859 5860 5861 5862 5863 5864
		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);
		}
5865

5866 5867 5868 5869 5870 5871
		/* 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;
		}
	}
5872

5873
	one |= NETIF_F_ALL_CSUM;
5874

5875
	one |= all & NETIF_F_ONE_FOR_ALL;
5876
	all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5877
	all |= one & mask & NETIF_F_ONE_FOR_ALL;
5878 5879 5880

	return all;
}
5881
EXPORT_SYMBOL(netdev_increment_features);
5882

5883 5884 5885 5886 5887 5888 5889 5890 5891 5892 5893 5894 5895
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;
}

5896
/* Initialize per network namespace state */
5897
static int __net_init netdev_init(struct net *net)
5898 5899 5900
{
	INIT_LIST_HEAD(&net->dev_base_head);

5901 5902 5903
	net->dev_name_head = netdev_create_hash();
	if (net->dev_name_head == NULL)
		goto err_name;
5904

5905 5906 5907
	net->dev_index_head = netdev_create_hash();
	if (net->dev_index_head == NULL)
		goto err_idx;
5908 5909

	return 0;
5910 5911 5912 5913 5914

err_idx:
	kfree(net->dev_name_head);
err_name:
	return -ENOMEM;
5915 5916
}

5917 5918 5919 5920 5921 5922 5923 5924
/**
 *	netdev_drivername - network driver for the device
 *	@dev: network device
 *	@buffer: buffer for resulting name
 *	@len: size of buffer
 *
 *	Determine network driver for device.
 */
5925
char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5926
{
5927 5928
	const struct device_driver *driver;
	const struct device *parent;
5929 5930 5931 5932 5933 5934 5935 5936 5937 5938 5939 5940 5941 5942 5943 5944

	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;
}

5945 5946 5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958 5959 5960 5961 5962 5963 5964 5965 5966 5967 5968 5969 5970 5971 5972 5973 5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984 5985 5986 5987 5988 5989 5990 5991 5992 5993 5994 5995 5996 5997 5998 5999 6000 6001 6002 6003 6004 6005 6006
static int __netdev_printk(const char *level, const struct net_device *dev,
			   struct va_format *vaf)
{
	int r;

	if (dev && dev->dev.parent)
		r = dev_printk(level, dev->dev.parent, "%s: %pV",
			       netdev_name(dev), vaf);
	else if (dev)
		r = printk("%s%s: %pV", level, netdev_name(dev), vaf);
	else
		r = printk("%s(NULL net_device): %pV", level, vaf);

	return r;
}

int netdev_printk(const char *level, const struct net_device *dev,
		  const char *format, ...)
{
	struct va_format vaf;
	va_list args;
	int r;

	va_start(args, format);

	vaf.fmt = format;
	vaf.va = &args;

	r = __netdev_printk(level, dev, &vaf);
	va_end(args);

	return r;
}
EXPORT_SYMBOL(netdev_printk);

#define define_netdev_printk_level(func, level)			\
int func(const struct net_device *dev, const char *fmt, ...)	\
{								\
	int r;							\
	struct va_format vaf;					\
	va_list args;						\
								\
	va_start(args, fmt);					\
								\
	vaf.fmt = fmt;						\
	vaf.va = &args;						\
								\
	r = __netdev_printk(level, dev, &vaf);			\
	va_end(args);						\
								\
	return r;						\
}								\
EXPORT_SYMBOL(func);

define_netdev_printk_level(netdev_emerg, KERN_EMERG);
define_netdev_printk_level(netdev_alert, KERN_ALERT);
define_netdev_printk_level(netdev_crit, KERN_CRIT);
define_netdev_printk_level(netdev_err, KERN_ERR);
define_netdev_printk_level(netdev_warn, KERN_WARNING);
define_netdev_printk_level(netdev_notice, KERN_NOTICE);
define_netdev_printk_level(netdev_info, KERN_INFO);

6007
static void __net_exit netdev_exit(struct net *net)
6008 6009 6010 6011 6012
{
	kfree(net->dev_name_head);
	kfree(net->dev_index_head);
}

6013
static struct pernet_operations __net_initdata netdev_net_ops = {
6014 6015 6016 6017
	.init = netdev_init,
	.exit = netdev_exit,
};

6018
static void __net_exit default_device_exit(struct net *net)
6019
{
6020
	struct net_device *dev, *aux;
6021
	/*
6022
	 * Push all migratable network devices back to the
6023 6024 6025
	 * initial network namespace
	 */
	rtnl_lock();
6026
	for_each_netdev_safe(net, dev, aux) {
6027
		int err;
6028
		char fb_name[IFNAMSIZ];
6029 6030 6031 6032 6033

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

6034 6035 6036
		/* Leave virtual devices for the generic cleanup */
		if (dev->rtnl_link_ops)
			continue;
6037

6038
		/* Push remaing network devices to init_net */
6039 6040
		snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
		err = dev_change_net_namespace(dev, &init_net, fb_name);
6041
		if (err) {
6042
			printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6043
				__func__, dev->name, err);
6044
			BUG();
6045 6046 6047 6048 6049
		}
	}
	rtnl_unlock();
}

6050 6051 6052 6053 6054 6055 6056 6057 6058 6059 6060 6061 6062 6063 6064 6065 6066 6067 6068 6069 6070 6071 6072 6073
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();
}

6074
static struct pernet_operations __net_initdata default_device_ops = {
6075
	.exit = default_device_exit,
6076
	.exit_batch = default_device_exit_batch,
6077 6078
};

L
Linus Torvalds 已提交
6079 6080 6081 6082 6083 6084 6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097 6098
/*
 *	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;

6099
	if (netdev_kobject_init())
L
Linus Torvalds 已提交
6100 6101 6102
		goto out;

	INIT_LIST_HEAD(&ptype_all);
6103
	for (i = 0; i < PTYPE_HASH_SIZE; i++)
L
Linus Torvalds 已提交
6104 6105
		INIT_LIST_HEAD(&ptype_base[i]);

6106 6107
	if (register_pernet_subsys(&netdev_net_ops))
		goto out;
L
Linus Torvalds 已提交
6108 6109 6110 6111 6112

	/*
	 *	Initialise the packet receive queues.
	 */

6113
	for_each_possible_cpu(i) {
E
Eric Dumazet 已提交
6114
		struct softnet_data *sd = &per_cpu(softnet_data, i);
L
Linus Torvalds 已提交
6115

C
Changli Gao 已提交
6116
		memset(sd, 0, sizeof(*sd));
E
Eric Dumazet 已提交
6117
		skb_queue_head_init(&sd->input_pkt_queue);
6118
		skb_queue_head_init(&sd->process_queue);
E
Eric Dumazet 已提交
6119 6120
		sd->completion_queue = NULL;
		INIT_LIST_HEAD(&sd->poll_list);
6121 6122
		sd->output_queue = NULL;
		sd->output_queue_tailp = &sd->output_queue;
E
Eric Dumazet 已提交
6123
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
6124 6125 6126 6127
		sd->csd.func = rps_trigger_softirq;
		sd->csd.info = sd;
		sd->csd.flags = 0;
		sd->cpu = i;
6128
#endif
T
Tom Herbert 已提交
6129

E
Eric Dumazet 已提交
6130 6131 6132 6133
		sd->backlog.poll = process_backlog;
		sd->backlog.weight = weight_p;
		sd->backlog.gro_list = NULL;
		sd->backlog.gro_count = 0;
L
Linus Torvalds 已提交
6134 6135 6136 6137
	}

	dev_boot_phase = 0;

6138 6139 6140 6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151 6152
	/* 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;

6153 6154
	open_softirq(NET_TX_SOFTIRQ, net_tx_action);
	open_softirq(NET_RX_SOFTIRQ, net_rx_action);
L
Linus Torvalds 已提交
6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165

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

subsys_initcall(net_dev_init);

6166 6167
static int __init initialize_hashrnd(void)
{
T
Tom Herbert 已提交
6168
	get_random_bytes(&hashrnd, sizeof(hashrnd));
6169 6170 6171 6172 6173
	return 0;
}

late_initcall_sync(initialize_hashrnd);