dev.c 157.5 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 <trace/events/net.h>
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#include <trace/events/skb.h>
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#include <linux/pci.h>
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#include <linux/inetdevice.h>
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#include <linux/cpu_rmap.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
	 */
549
	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
595
 *	@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.
 */

605
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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E
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611
	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
614

L
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	return NULL;
}
E
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617
EXPORT_SYMBOL(__dev_get_by_name);
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619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644
/**
 *	dev_get_by_name_rcu	- find a device by its name
 *	@net: the applicable net namespace
 *	@name: name to find
 *
 *	Find an interface by name.
 *	If the name is found a pointer to the device is returned.
 * 	If the name is not found then %NULL is returned.
 *	The reference counters are not incremented so the caller must be
 *	careful with locks. The caller must hold RCU lock.
 */

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

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

	return NULL;
}
EXPORT_SYMBOL(dev_get_by_name_rcu);

L
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645 646
/**
 *	dev_get_by_name		- find a device by its name
647
 *	@net: the applicable net namespace
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648 649 650 651 652 653 654 655 656
 *	@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.
 */

657
struct net_device *dev_get_by_name(struct net *net, const char *name)
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{
	struct net_device *dev;

661 662
	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
L
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663 664
	if (dev)
		dev_hold(dev);
665
	rcu_read_unlock();
L
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	return dev;
}
E
Eric Dumazet 已提交
668
EXPORT_SYMBOL(dev_get_by_name);
L
Linus Torvalds 已提交
669 670 671

/**
 *	__dev_get_by_index - find a device by its ifindex
672
 *	@net: the applicable net namespace
L
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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.
 */

682
struct net_device *__dev_get_by_index(struct net *net, int ifindex)
L
Linus Torvalds 已提交
683 684
{
	struct hlist_node *p;
E
Eric Dumazet 已提交
685 686
	struct net_device *dev;
	struct hlist_head *head = dev_index_hash(net, ifindex);
L
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687

E
Eric Dumazet 已提交
688
	hlist_for_each_entry(dev, p, head, index_hlist)
L
Linus Torvalds 已提交
689 690
		if (dev->ifindex == ifindex)
			return dev;
E
Eric Dumazet 已提交
691

L
Linus Torvalds 已提交
692 693
	return NULL;
}
E
Eric Dumazet 已提交
694
EXPORT_SYMBOL(__dev_get_by_index);
L
Linus Torvalds 已提交
695

696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720
/**
 *	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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721 722 723

/**
 *	dev_get_by_index - find a device by its ifindex
724
 *	@net: the applicable net namespace
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725 726 727 728 729 730 731 732
 *	@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.
 */

733
struct net_device *dev_get_by_index(struct net *net, int ifindex)
L
Linus Torvalds 已提交
734 735 736
{
	struct net_device *dev;

737 738
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifindex);
L
Linus Torvalds 已提交
739 740
	if (dev)
		dev_hold(dev);
741
	rcu_read_unlock();
L
Linus Torvalds 已提交
742 743
	return dev;
}
E
Eric Dumazet 已提交
744
EXPORT_SYMBOL(dev_get_by_index);
L
Linus Torvalds 已提交
745 746

/**
747
 *	dev_getbyhwaddr_rcu - find a device by its hardware address
748
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
749 750 751 752
 *	@type: media type of device
 *	@ha: hardware address
 *
 *	Search for an interface by MAC address. Returns NULL if the device
E
Eric Dumazet 已提交
753 754
 *	is not found or a pointer to the device.
 *	The caller must hold RCU or RTNL.
755
 *	The returned device has not had its ref count increased
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756 757 758 759
 *	and the caller must therefore be careful about locking
 *
 */

760 761
struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
				       const char *ha)
L
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762 763 764
{
	struct net_device *dev;

765
	for_each_netdev_rcu(net, dev)
L
Linus Torvalds 已提交
766 767
		if (dev->type == type &&
		    !memcmp(dev->dev_addr, ha, dev->addr_len))
768 769 770
			return dev;

	return NULL;
L
Linus Torvalds 已提交
771
}
772
EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
773

774
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
L
Linus Torvalds 已提交
775 776 777
{
	struct net_device *dev;

778
	ASSERT_RTNL();
779
	for_each_netdev(net, dev)
780
		if (dev->type == type)
781 782 783
			return dev;

	return NULL;
784 785 786
}
EXPORT_SYMBOL(__dev_getfirstbyhwtype);

787
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
788
{
789
	struct net_device *dev, *ret = NULL;
790

791 792 793 794 795 796 797 798 799
	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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800 801 802 803
}
EXPORT_SYMBOL(dev_getfirstbyhwtype);

/**
E
Eric Dumazet 已提交
804
 *	dev_get_by_flags_rcu - find any device with given flags
805
 *	@net: the applicable net namespace
L
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806 807 808 809
 *	@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
810 811
 *	is not found or a pointer to the device. Must be called inside
 *	rcu_read_lock(), and result refcount is unchanged.
L
Linus Torvalds 已提交
812 813
 */

E
Eric Dumazet 已提交
814
struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
E
Eric Dumazet 已提交
815
				    unsigned short mask)
L
Linus Torvalds 已提交
816
{
817
	struct net_device *dev, *ret;
L
Linus Torvalds 已提交
818

819
	ret = NULL;
820
	for_each_netdev_rcu(net, dev) {
L
Linus Torvalds 已提交
821
		if (((dev->flags ^ if_flags) & mask) == 0) {
822
			ret = dev;
L
Linus Torvalds 已提交
823 824 825
			break;
		}
	}
826
	return ret;
L
Linus Torvalds 已提交
827
}
E
Eric Dumazet 已提交
828
EXPORT_SYMBOL(dev_get_by_flags_rcu);
L
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829 830 831 832 833 834

/**
 *	dev_valid_name - check if name is okay for network device
 *	@name: name string
 *
 *	Network device names need to be valid file names to
835 836
 *	to allow sysfs to work.  We also disallow any kind of
 *	whitespace.
L
Linus Torvalds 已提交
837
 */
838
int dev_valid_name(const char *name)
L
Linus Torvalds 已提交
839
{
840 841
	if (*name == '\0')
		return 0;
842 843
	if (strlen(name) >= IFNAMSIZ)
		return 0;
844 845 846 847 848 849 850 851 852
	if (!strcmp(name, ".") || !strcmp(name, ".."))
		return 0;

	while (*name) {
		if (*name == '/' || isspace(*name))
			return 0;
		name++;
	}
	return 1;
L
Linus Torvalds 已提交
853
}
E
Eric Dumazet 已提交
854
EXPORT_SYMBOL(dev_valid_name);
L
Linus Torvalds 已提交
855 856

/**
857 858
 *	__dev_alloc_name - allocate a name for a device
 *	@net: network namespace to allocate the device name in
L
Linus Torvalds 已提交
859
 *	@name: name format string
860
 *	@buf:  scratch buffer and result name string
L
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861 862
 *
 *	Passed a format string - eg "lt%d" it will try and find a suitable
S
Stephen Hemminger 已提交
863 864 865 866 867 868
 *	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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869 870
 */

871
static int __dev_alloc_name(struct net *net, const char *name, char *buf)
L
Linus Torvalds 已提交
872 873 874 875
{
	int i = 0;
	const char *p;
	const int max_netdevices = 8*PAGE_SIZE;
S
Stephen Hemminger 已提交
876
	unsigned long *inuse;
L
Linus Torvalds 已提交
877 878 879 880 881 882 883 884 885 886 887 888 889
	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
890
		inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
L
Linus Torvalds 已提交
891 892 893
		if (!inuse)
			return -ENOMEM;

894
		for_each_netdev(net, d) {
L
Linus Torvalds 已提交
895 896 897 898 899 900
			if (!sscanf(d->name, name, &i))
				continue;
			if (i < 0 || i >= max_netdevices)
				continue;

			/*  avoid cases where sscanf is not exact inverse of printf */
901
			snprintf(buf, IFNAMSIZ, name, i);
L
Linus Torvalds 已提交
902 903 904 905 906 907 908 909
			if (!strncmp(buf, d->name, IFNAMSIZ))
				set_bit(i, inuse);
		}

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

910 911
	if (buf != name)
		snprintf(buf, IFNAMSIZ, name, i);
912
	if (!__dev_get_by_name(net, buf))
L
Linus Torvalds 已提交
913 914 915 916 917 918 919 920 921
		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;
}

922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941
/**
 *	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;

942 943
	BUG_ON(!dev_net(dev));
	net = dev_net(dev);
944 945 946 947 948
	ret = __dev_alloc_name(net, name, buf);
	if (ret >= 0)
		strlcpy(dev->name, buf, IFNAMSIZ);
	return ret;
}
E
Eric Dumazet 已提交
949
EXPORT_SYMBOL(dev_alloc_name);
950

951
static int dev_get_valid_name(struct net_device *dev, const char *name, bool fmt)
952
{
953 954 955 956 957
	struct net *net;

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

958 959 960 961
	if (!dev_valid_name(name))
		return -EINVAL;

	if (fmt && strchr(name, '%'))
962
		return dev_alloc_name(dev, name);
963 964
	else if (__dev_get_by_name(net, name))
		return -EEXIST;
965 966
	else if (dev->name != name)
		strlcpy(dev->name, name, IFNAMSIZ);
967 968 969

	return 0;
}
L
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970 971 972 973 974 975 976 977 978

/**
 *	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.
 */
979
int dev_change_name(struct net_device *dev, const char *newname)
L
Linus Torvalds 已提交
980
{
981
	char oldname[IFNAMSIZ];
L
Linus Torvalds 已提交
982
	int err = 0;
983
	int ret;
984
	struct net *net;
L
Linus Torvalds 已提交
985 986

	ASSERT_RTNL();
987
	BUG_ON(!dev_net(dev));
L
Linus Torvalds 已提交
988

989
	net = dev_net(dev);
L
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990 991 992
	if (dev->flags & IFF_UP)
		return -EBUSY;

993 994 995
	if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
		return 0;

996 997
	memcpy(oldname, dev->name, IFNAMSIZ);

998
	err = dev_get_valid_name(dev, newname, 1);
999 1000
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
1001

1002
rollback:
1003 1004 1005 1006
	ret = device_rename(&dev->dev, dev->name);
	if (ret) {
		memcpy(dev->name, oldname, IFNAMSIZ);
		return ret;
1007
	}
1008 1009

	write_lock_bh(&dev_base_lock);
1010
	hlist_del(&dev->name_hlist);
1011 1012 1013 1014 1015 1016
	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));
1017 1018
	write_unlock_bh(&dev_base_lock);

1019
	ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1020 1021 1022
	ret = notifier_to_errno(ret);

	if (ret) {
1023 1024
		/* err >= 0 after dev_alloc_name() or stores the first errno */
		if (err >= 0) {
1025 1026 1027
			err = ret;
			memcpy(dev->name, oldname, IFNAMSIZ);
			goto rollback;
1028 1029 1030 1031
		} else {
			printk(KERN_ERR
			       "%s: name change rollback failed: %d.\n",
			       dev->name, ret);
1032 1033
		}
	}
L
Linus Torvalds 已提交
1034 1035 1036 1037

	return err;
}

1038 1039 1040 1041
/**
 *	dev_set_alias - change ifalias of a device
 *	@dev: device
 *	@alias: name up to IFALIASZ
1042
 *	@len: limit of bytes to copy from info
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052
 *
 *	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;

1053 1054 1055 1056 1057 1058 1059 1060
	if (!len) {
		if (dev->ifalias) {
			kfree(dev->ifalias);
			dev->ifalias = NULL;
		}
		return 0;
	}

E
Eric Dumazet 已提交
1061
	dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1062 1063 1064 1065 1066 1067 1068 1069
	if (!dev->ifalias)
		return -ENOMEM;

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


1070
/**
S
Stephen Hemminger 已提交
1071
 *	netdev_features_change - device changes features
1072 1073 1074 1075 1076 1077
 *	@dev: device to cause notification
 *
 *	Called to indicate a device has changed features.
 */
void netdev_features_change(struct net_device *dev)
{
1078
	call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1079 1080 1081
}
EXPORT_SYMBOL(netdev_features_change);

L
Linus Torvalds 已提交
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092
/**
 *	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) {
1093
		call_netdevice_notifiers(NETDEV_CHANGE, dev);
L
Linus Torvalds 已提交
1094 1095 1096
		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
	}
}
E
Eric Dumazet 已提交
1097
EXPORT_SYMBOL(netdev_state_change);
L
Linus Torvalds 已提交
1098

1099
int netdev_bonding_change(struct net_device *dev, unsigned long event)
1100
{
1101
	return call_netdevice_notifiers(event, dev);
1102 1103 1104
}
EXPORT_SYMBOL(netdev_bonding_change);

L
Linus Torvalds 已提交
1105 1106
/**
 *	dev_load 	- load a network module
1107
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
1108 1109 1110 1111 1112 1113 1114
 *	@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.
 */

1115
void dev_load(struct net *net, const char *name)
L
Linus Torvalds 已提交
1116
{
1117
	struct net_device *dev;
L
Linus Torvalds 已提交
1118

1119 1120 1121
	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
	rcu_read_unlock();
L
Linus Torvalds 已提交
1122

1123
	if (!dev && capable(CAP_NET_ADMIN))
L
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1124 1125
		request_module("%s", name);
}
E
Eric Dumazet 已提交
1126
EXPORT_SYMBOL(dev_load);
L
Linus Torvalds 已提交
1127

1128
static int __dev_open(struct net_device *dev)
L
Linus Torvalds 已提交
1129
{
1130
	const struct net_device_ops *ops = dev->netdev_ops;
1131
	int ret;
L
Linus Torvalds 已提交
1132

1133 1134
	ASSERT_RTNL();

L
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1135 1136 1137 1138 1139 1140
	/*
	 *	Is it even present?
	 */
	if (!netif_device_present(dev))
		return -ENODEV;

1141 1142 1143 1144 1145
	ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		return ret;

L
Linus Torvalds 已提交
1146 1147 1148 1149
	/*
	 *	Call device private open method
	 */
	set_bit(__LINK_STATE_START, &dev->state);
1150

1151 1152
	if (ops->ndo_validate_addr)
		ret = ops->ndo_validate_addr(dev);
1153

1154 1155
	if (!ret && ops->ndo_open)
		ret = ops->ndo_open(dev);
L
Linus Torvalds 已提交
1156

1157
	/*
L
Linus Torvalds 已提交
1158 1159 1160
	 *	If it went open OK then:
	 */

1161 1162 1163
	if (ret)
		clear_bit(__LINK_STATE_START, &dev->state);
	else {
L
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1164 1165 1166 1167 1168
		/*
		 *	Set the flags.
		 */
		dev->flags |= IFF_UP;

1169 1170 1171
		/*
		 *	Enable NET_DMA
		 */
1172
		net_dmaengine_get();
1173

L
Linus Torvalds 已提交
1174 1175 1176
		/*
		 *	Initialize multicasting status
		 */
1177
		dev_set_rx_mode(dev);
L
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1178 1179 1180 1181 1182 1183

		/*
		 *	Wakeup transmit queue engine
		 */
		dev_activate(dev);
	}
1184

L
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1185 1186 1187 1188
	return ret;
}

/**
1189 1190
 *	dev_open	- prepare an interface for use.
 *	@dev:	device to open
L
Linus Torvalds 已提交
1191
 *
1192 1193 1194 1195 1196 1197 1198
 *	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
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);

1227
static int __dev_close_many(struct list_head *head)
L
Linus Torvalds 已提交
1228
{
1229
	struct net_device *dev;
1230

1231
	ASSERT_RTNL();
1232 1233
	might_sleep();

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

1241
		clear_bit(__LINK_STATE_START, &dev->state);
L
Linus Torvalds 已提交
1242

1243 1244 1245 1246 1247 1248 1249 1250
		/* Synchronize to scheduled poll. We cannot touch poll list, 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.
		 */
		smp_mb__after_clear_bit(); /* Commit netif_running(). */
	}
L
Linus Torvalds 已提交
1251

1252
	dev_deactivate_many(head);
1253

1254 1255
	list_for_each_entry(dev, head, unreg_list) {
		const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
1256

1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289
		/*
		 *	Call the device specific close. This cannot fail.
		 *	Only if device is UP
		 *
		 *	We allow it to be called even after a DETACH hot-plug
		 *	event.
		 */
		if (ops->ndo_stop)
			ops->ndo_stop(dev);

		/*
		 *	Device is now down.
		 */

		dev->flags &= ~IFF_UP;

		/*
		 *	Shutdown NET_DMA
		 */
		net_dmaengine_put();
	}

	return 0;
}

static int __dev_close(struct net_device *dev)
{
	LIST_HEAD(single);

	list_add(&dev->unreg_list, &single);
	return __dev_close_many(&single);
}

E
Eric Dumazet 已提交
1290
static int dev_close_many(struct list_head *head)
1291 1292 1293
{
	struct net_device *dev, *tmp;
	LIST_HEAD(tmp_list);
L
Linus Torvalds 已提交
1294

1295 1296 1297 1298 1299
	list_for_each_entry_safe(dev, tmp, head, unreg_list)
		if (!(dev->flags & IFF_UP))
			list_move(&dev->unreg_list, &tmp_list);

	__dev_close_many(head);
L
Linus Torvalds 已提交
1300 1301

	/*
1302
	 * Tell people we are down
L
Linus Torvalds 已提交
1303
	 */
1304 1305 1306 1307
	list_for_each_entry(dev, head, unreg_list) {
		rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
		call_netdevice_notifiers(NETDEV_DOWN, dev);
	}
1308

1309 1310
	/* rollback_registered_many needs the complete original list */
	list_splice(&tmp_list, head);
1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324
	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)
{
1325
	LIST_HEAD(single);
L
Linus Torvalds 已提交
1326

1327 1328
	list_add(&dev->unreg_list, &single);
	dev_close_many(&single);
1329

L
Linus Torvalds 已提交
1330 1331
	return 0;
}
E
Eric Dumazet 已提交
1332
EXPORT_SYMBOL(dev_close);
L
Linus Torvalds 已提交
1333 1334


1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357
/**
 *	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);


1358 1359
static int dev_boot_phase = 1;

L
Linus Torvalds 已提交
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374
/*
 *	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
1375
 *	to the new notifier to allow device to have a race free
L
Linus Torvalds 已提交
1376 1377 1378 1379 1380 1381
 *	view of the network device list.
 */

int register_netdevice_notifier(struct notifier_block *nb)
{
	struct net_device *dev;
1382
	struct net_device *last;
1383
	struct net *net;
L
Linus Torvalds 已提交
1384 1385 1386
	int err;

	rtnl_lock();
1387
	err = raw_notifier_chain_register(&netdev_chain, nb);
1388 1389
	if (err)
		goto unlock;
1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400
	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
1401

1402 1403
			nb->notifier_call(nb, NETDEV_UP, dev);
		}
L
Linus Torvalds 已提交
1404
	}
1405 1406

unlock:
L
Linus Torvalds 已提交
1407 1408
	rtnl_unlock();
	return err;
1409 1410 1411

rollback:
	last = dev;
1412 1413 1414 1415
	for_each_net(net) {
		for_each_netdev(net, dev) {
			if (dev == last)
				break;
1416

1417 1418 1419 1420 1421
			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);
1422
			nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1423 1424
		}
	}
1425 1426

	raw_notifier_chain_unregister(&netdev_chain, nb);
1427
	goto unlock;
L
Linus Torvalds 已提交
1428
}
E
Eric Dumazet 已提交
1429
EXPORT_SYMBOL(register_netdevice_notifier);
L
Linus Torvalds 已提交
1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442

/**
 *	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)
{
1443 1444 1445
	int err;

	rtnl_lock();
1446
	err = raw_notifier_chain_unregister(&netdev_chain, nb);
1447 1448
	rtnl_unlock();
	return err;
L
Linus Torvalds 已提交
1449
}
E
Eric Dumazet 已提交
1450
EXPORT_SYMBOL(unregister_netdevice_notifier);
L
Linus Torvalds 已提交
1451 1452 1453 1454

/**
 *	call_netdevice_notifiers - call all network notifier blocks
 *      @val: value passed unmodified to notifier function
1455
 *      @dev: net_device pointer passed unmodified to notifier function
L
Linus Torvalds 已提交
1456 1457
 *
 *	Call all network notifier blocks.  Parameters and return value
1458
 *	are as for raw_notifier_call_chain().
L
Linus Torvalds 已提交
1459 1460
 */

1461
int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
L
Linus Torvalds 已提交
1462
{
1463
	ASSERT_RTNL();
1464
	return raw_notifier_call_chain(&netdev_chain, val, dev);
L
Linus Torvalds 已提交
1465 1466 1467 1468 1469 1470 1471 1472 1473
}

/* 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
1474
EXPORT_SYMBOL(net_enable_timestamp);
L
Linus Torvalds 已提交
1475 1476 1477 1478 1479

void net_disable_timestamp(void)
{
	atomic_dec(&netstamp_needed);
}
E
Eric Dumazet 已提交
1480
EXPORT_SYMBOL(net_disable_timestamp);
L
Linus Torvalds 已提交
1481

E
Eric Dumazet 已提交
1482
static inline void net_timestamp_set(struct sk_buff *skb)
L
Linus Torvalds 已提交
1483 1484
{
	if (atomic_read(&netstamp_needed))
1485
		__net_timestamp(skb);
1486 1487
	else
		skb->tstamp.tv64 = 0;
L
Linus Torvalds 已提交
1488 1489
}

E
Eric Dumazet 已提交
1490 1491 1492 1493 1494 1495
static inline void net_timestamp_check(struct sk_buff *skb)
{
	if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed))
		__net_timestamp(skb);
}

1496 1497 1498 1499 1500 1501 1502 1503
/**
 * dev_forward_skb - loopback an skb to another netif
 *
 * @dev: destination network device
 * @skb: buffer to forward
 *
 * return values:
 *	NET_RX_SUCCESS	(no congestion)
1504
 *	NET_RX_DROP     (packet was dropped, but freed)
1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516
 *
 * 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);
1517
	nf_reset(skb);
1518

1519
	if (unlikely(!(dev->flags & IFF_UP) ||
1520
		     (skb->len > (dev->mtu + dev->hard_header_len + VLAN_HLEN)))) {
1521
		atomic_long_inc(&dev->rx_dropped);
1522
		kfree_skb(skb);
1523
		return NET_RX_DROP;
1524
	}
1525
	skb_set_dev(skb, dev);
1526 1527 1528 1529 1530 1531 1532
	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);

1533 1534 1535 1536 1537 1538 1539 1540
static inline int deliver_skb(struct sk_buff *skb,
			      struct packet_type *pt_prev,
			      struct net_device *orig_dev)
{
	atomic_inc(&skb->users);
	return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
}

L
Linus Torvalds 已提交
1541 1542 1543 1544 1545
/*
 *	Support routine. Sends outgoing frames to any network
 *	taps currently in use.
 */

1546
static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
L
Linus Torvalds 已提交
1547 1548
{
	struct packet_type *ptype;
1549 1550
	struct sk_buff *skb2 = NULL;
	struct packet_type *pt_prev = NULL;
1551

L
Linus Torvalds 已提交
1552 1553 1554 1555 1556 1557 1558 1559
	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)) {
1560 1561 1562 1563 1564 1565 1566
			if (pt_prev) {
				deliver_skb(skb2, pt_prev, skb->dev);
				pt_prev = ptype;
				continue;
			}

			skb2 = skb_clone(skb, GFP_ATOMIC);
L
Linus Torvalds 已提交
1567 1568 1569
			if (!skb2)
				break;

1570 1571
			net_timestamp_set(skb2);

L
Linus Torvalds 已提交
1572 1573 1574 1575
			/* skb->nh should be correctly
			   set by sender, so that the second statement is
			   just protection against buggy protocols.
			 */
1576
			skb_reset_mac_header(skb2);
L
Linus Torvalds 已提交
1577

1578
			if (skb_network_header(skb2) < skb2->data ||
1579
			    skb2->network_header > skb2->tail) {
L
Linus Torvalds 已提交
1580 1581 1582
				if (net_ratelimit())
					printk(KERN_CRIT "protocol %04x is "
					       "buggy, dev %s\n",
1583 1584
					       ntohs(skb2->protocol),
					       dev->name);
1585
				skb_reset_network_header(skb2);
L
Linus Torvalds 已提交
1586 1587
			}

1588
			skb2->transport_header = skb2->network_header;
L
Linus Torvalds 已提交
1589
			skb2->pkt_type = PACKET_OUTGOING;
1590
			pt_prev = ptype;
L
Linus Torvalds 已提交
1591 1592
		}
	}
1593 1594
	if (pt_prev)
		pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
L
Linus Torvalds 已提交
1595 1596 1597
	rcu_read_unlock();
}

1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609
/* netif_setup_tc - Handle tc mappings on real_num_tx_queues change
 * @dev: Network device
 * @txq: number of queues available
 *
 * If real_num_tx_queues is changed the tc mappings may no longer be
 * valid. To resolve this verify the tc mapping remains valid and if
 * not NULL the mapping. With no priorities mapping to this
 * offset/count pair it will no longer be used. In the worst case TC0
 * is invalid nothing can be done so disable priority mappings. If is
 * expected that drivers will fix this mapping if they can before
 * calling netif_set_real_num_tx_queues.
 */
E
Eric Dumazet 已提交
1610
static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639
{
	int i;
	struct netdev_tc_txq *tc = &dev->tc_to_txq[0];

	/* If TC0 is invalidated disable TC mapping */
	if (tc->offset + tc->count > txq) {
		pr_warning("Number of in use tx queues changed "
			   "invalidating tc mappings. Priority "
			   "traffic classification disabled!\n");
		dev->num_tc = 0;
		return;
	}

	/* Invalidated prio to tc mappings set to TC0 */
	for (i = 1; i < TC_BITMASK + 1; i++) {
		int q = netdev_get_prio_tc_map(dev, i);

		tc = &dev->tc_to_txq[q];
		if (tc->offset + tc->count > txq) {
			pr_warning("Number of in use tx queues "
				   "changed. Priority %i to tc "
				   "mapping %i is no longer valid "
				   "setting map to 0\n",
				   i, q);
			netdev_set_prio_tc_map(dev, i, 0);
		}
	}
}

1640 1641 1642 1643
/*
 * 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.
 */
1644
int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1645
{
T
Tom Herbert 已提交
1646 1647
	int rc;

1648 1649
	if (txq < 1 || txq > dev->num_tx_queues)
		return -EINVAL;
1650

1651 1652
	if (dev->reg_state == NETREG_REGISTERED ||
	    dev->reg_state == NETREG_UNREGISTERING) {
1653 1654
		ASSERT_RTNL();

T
Tom Herbert 已提交
1655 1656
		rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
						  txq);
T
Tom Herbert 已提交
1657 1658 1659
		if (rc)
			return rc;

1660 1661 1662
		if (dev->num_tc)
			netif_setup_tc(dev, txq);

1663 1664
		if (txq < dev->real_num_tx_queues)
			qdisc_reset_all_tx_gt(dev, txq);
1665
	}
1666 1667 1668

	dev->real_num_tx_queues = txq;
	return 0;
1669 1670
}
EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1671

1672 1673 1674 1675 1676 1677 1678 1679
#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
1680 1681
 *	negative error code.  If called before registration, it always
 *	succeeds.
1682 1683 1684 1685 1686
 */
int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
{
	int rc;

T
Tom Herbert 已提交
1687 1688 1689
	if (rxq < 1 || rxq > dev->num_rx_queues)
		return -EINVAL;

1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704
	if (dev->reg_state == NETREG_REGISTERED) {
		ASSERT_RTNL();

		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

1705
static inline void __netif_reschedule(struct Qdisc *q)
1706
{
1707 1708
	struct softnet_data *sd;
	unsigned long flags;
1709

1710 1711
	local_irq_save(flags);
	sd = &__get_cpu_var(softnet_data);
1712 1713 1714
	q->next_sched = NULL;
	*sd->output_queue_tailp = q;
	sd->output_queue_tailp = &q->next_sched;
1715 1716 1717 1718 1719 1720 1721 1722
	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);
1723 1724 1725
}
EXPORT_SYMBOL(__netif_schedule);

1726
void dev_kfree_skb_irq(struct sk_buff *skb)
1727
{
1728
	if (atomic_dec_and_test(&skb->users)) {
1729 1730
		struct softnet_data *sd;
		unsigned long flags;
1731

1732 1733 1734 1735 1736 1737 1738
		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);
	}
1739
}
1740
EXPORT_SYMBOL(dev_kfree_skb_irq);
1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751

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);


1752 1753 1754 1755 1756 1757
/**
 * netif_device_detach - mark device as removed
 * @dev: network device
 *
 * Mark device as removed from system and therefore no longer available.
 */
1758 1759 1760 1761
void netif_device_detach(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
1762
		netif_tx_stop_all_queues(dev);
1763 1764 1765 1766
	}
}
EXPORT_SYMBOL(netif_device_detach);

1767 1768 1769 1770 1771 1772
/**
 * netif_device_attach - mark device as attached
 * @dev: network device
 *
 * Mark device as attached from system and restart if needed.
 */
1773 1774 1775 1776
void netif_device_attach(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
1777
		netif_tx_wake_all_queues(dev);
1778
		__netdev_watchdog_up(dev);
1779 1780 1781 1782
	}
}
EXPORT_SYMBOL(netif_device_attach);

1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812
/**
 * 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
1813 1814 1815 1816
/*
 * Invalidate hardware checksum when packet is to be mangled, and
 * complete checksum manually on outgoing path.
 */
1817
int skb_checksum_help(struct sk_buff *skb)
L
Linus Torvalds 已提交
1818
{
1819
	__wsum csum;
1820
	int ret = 0, offset;
L
Linus Torvalds 已提交
1821

1822
	if (skb->ip_summed == CHECKSUM_COMPLETE)
1823 1824 1825 1826 1827
		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
1828 1829
	}

1830
	offset = skb_checksum_start_offset(skb);
1831 1832 1833 1834 1835 1836 1837 1838
	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
1839 1840 1841 1842 1843
		ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
		if (ret)
			goto out;
	}

1844
	*(__sum16 *)(skb->data + offset) = csum_fold(csum);
1845
out_set_summed:
L
Linus Torvalds 已提交
1846
	skb->ip_summed = CHECKSUM_NONE;
1847
out:
L
Linus Torvalds 已提交
1848 1849
	return ret;
}
E
Eric Dumazet 已提交
1850
EXPORT_SYMBOL(skb_checksum_help);
L
Linus Torvalds 已提交
1851

1852 1853 1854
/**
 *	skb_gso_segment - Perform segmentation on skb.
 *	@skb: buffer to segment
1855
 *	@features: features for the output path (see dev->features)
1856 1857
 *
 *	This function segments the given skb and returns a list of segments.
1858 1859 1860
 *
 *	It may return NULL if the skb requires no segmentation.  This is
 *	only possible when GSO is used for verifying header integrity.
1861
 */
1862
struct sk_buff *skb_gso_segment(struct sk_buff *skb, u32 features)
1863 1864 1865
{
	struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
	struct packet_type *ptype;
A
Al Viro 已提交
1866
	__be16 type = skb->protocol;
1867
	int vlan_depth = ETH_HLEN;
1868
	int err;
1869

1870 1871
	while (type == htons(ETH_P_8021Q)) {
		struct vlan_hdr *vh;
1872

1873
		if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1874 1875
			return ERR_PTR(-EINVAL);

1876 1877 1878
		vh = (struct vlan_hdr *)(skb->data + vlan_depth);
		type = vh->h_vlan_encapsulated_proto;
		vlan_depth += VLAN_HLEN;
1879 1880
	}

1881
	skb_reset_mac_header(skb);
1882
	skb->mac_len = skb->network_header - skb->mac_header;
1883 1884
	__skb_pull(skb, skb->mac_len);

1885 1886 1887 1888 1889 1890 1891
	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);

J
Joe Perches 已提交
1892
		WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d ip_summed=%d\n",
1893 1894 1895 1896
		     info.driver, dev ? dev->features : 0L,
		     skb->sk ? skb->sk->sk_route_caps : 0L,
		     skb->len, skb->data_len, skb->ip_summed);

1897 1898 1899 1900 1901
		if (skb_header_cloned(skb) &&
		    (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
			return ERR_PTR(err);
	}

1902
	rcu_read_lock();
1903 1904
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1905
		if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1906
			if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1907 1908 1909 1910
				err = ptype->gso_send_check(skb);
				segs = ERR_PTR(err);
				if (err || skb_gso_ok(skb, features))
					break;
1911 1912
				__skb_push(skb, (skb->data -
						 skb_network_header(skb)));
1913
			}
1914
			segs = ptype->gso_segment(skb, features);
1915 1916 1917 1918 1919
			break;
		}
	}
	rcu_read_unlock();

1920
	__skb_push(skb, skb->data - skb_mac_header(skb));
1921

1922 1923 1924 1925
	return segs;
}
EXPORT_SYMBOL(skb_gso_segment);

1926 1927 1928 1929 1930
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG
void netdev_rx_csum_fault(struct net_device *dev)
{
	if (net_ratelimit()) {
1931
		printk(KERN_ERR "%s: hw csum failure.\n",
1932
			dev ? dev->name : "<unknown>");
1933 1934 1935 1936 1937 1938
		dump_stack();
	}
}
EXPORT_SYMBOL(netdev_rx_csum_fault);
#endif

L
Linus Torvalds 已提交
1939 1940 1941 1942 1943
/* 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
1944
static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
L
Linus Torvalds 已提交
1945
{
1946
#ifdef CONFIG_HIGHMEM
L
Linus Torvalds 已提交
1947
	int i;
1948 1949 1950 1951 1952
	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
1953

1954 1955
	if (PCI_DMA_BUS_IS_PHYS) {
		struct device *pdev = dev->dev.parent;
L
Linus Torvalds 已提交
1956

E
Eric Dumazet 已提交
1957 1958
		if (!pdev)
			return 0;
1959 1960 1961 1962 1963 1964
		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;
		}
	}
1965
#endif
L
Linus Torvalds 已提交
1966 1967 1968
	return 0;
}

1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994
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
1995
 *	@features: device features as applicable to this skb
1996 1997 1998 1999
 *
 *	This function segments the given skb and stores the list of segments
 *	in skb->next.
 */
2000
static int dev_gso_segment(struct sk_buff *skb, int features)
2001 2002
{
	struct sk_buff *segs;
2003 2004 2005 2006 2007 2008

	segs = skb_gso_segment(skb, features);

	/* Verifying header integrity only. */
	if (!segs)
		return 0;
2009

2010
	if (IS_ERR(segs))
2011 2012 2013 2014 2015 2016 2017 2018 2019
		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
2020 2021
/*
 * Try to orphan skb early, right before transmission by the device.
2022 2023
 * 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
2024 2025 2026
 */
static inline void skb_orphan_try(struct sk_buff *skb)
{
2027 2028
	struct sock *sk = skb->sk;

2029
	if (sk && !skb_shinfo(skb)->tx_flags) {
2030 2031 2032 2033 2034
		/* 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
2035
		skb_orphan(skb);
2036
	}
E
Eric Dumazet 已提交
2037 2038
}

2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049
static bool can_checksum_protocol(unsigned long features, __be16 protocol)
{
	return ((features & NETIF_F_GEN_CSUM) ||
		((features & NETIF_F_V4_CSUM) &&
		 protocol == htons(ETH_P_IP)) ||
		((features & NETIF_F_V6_CSUM) &&
		 protocol == htons(ETH_P_IPV6)) ||
		((features & NETIF_F_FCOE_CRC) &&
		 protocol == htons(ETH_P_FCOE)));
}

2050
static u32 harmonize_features(struct sk_buff *skb, __be16 protocol, u32 features)
2051
{
2052
	if (!can_checksum_protocol(features, protocol)) {
2053 2054 2055 2056 2057 2058 2059 2060 2061
		features &= ~NETIF_F_ALL_CSUM;
		features &= ~NETIF_F_SG;
	} else if (illegal_highdma(skb->dev, skb)) {
		features &= ~NETIF_F_SG;
	}

	return features;
}

2062
u32 netif_skb_features(struct sk_buff *skb)
2063 2064
{
	__be16 protocol = skb->protocol;
2065
	u32 features = skb->dev->features;
2066 2067 2068 2069

	if (protocol == htons(ETH_P_8021Q)) {
		struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
		protocol = veh->h_vlan_encapsulated_proto;
2070 2071 2072
	} else if (!vlan_tx_tag_present(skb)) {
		return harmonize_features(skb, protocol, features);
	}
2073

2074
	features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2075 2076 2077 2078 2079

	if (protocol != htons(ETH_P_8021Q)) {
		return harmonize_features(skb, protocol, features);
	} else {
		features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2080
				NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2081 2082
		return harmonize_features(skb, protocol, features);
	}
2083
}
2084
EXPORT_SYMBOL(netif_skb_features);
2085

2086 2087 2088 2089 2090 2091 2092 2093
/*
 * 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,
2094
				      int features)
2095
{
2096 2097 2098
	return skb_is_nonlinear(skb) &&
			((skb_has_frag_list(skb) &&
				!(features & NETIF_F_FRAGLIST)) ||
2099
			(skb_shinfo(skb)->nr_frags &&
2100
				!(features & NETIF_F_SG)));
2101 2102
}

2103 2104
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
			struct netdev_queue *txq)
2105
{
2106
	const struct net_device_ops *ops = dev->netdev_ops;
2107
	int rc = NETDEV_TX_OK;
2108

2109
	if (likely(!skb->next)) {
2110
		u32 features;
2111

2112 2113 2114 2115
		/*
		 * If device doesnt need skb->dst, release it right now while
		 * its hot in this cpu cache
		 */
E
Eric Dumazet 已提交
2116 2117 2118
		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
			skb_dst_drop(skb);

2119 2120 2121
		if (!list_empty(&ptype_all))
			dev_queue_xmit_nit(skb, dev);

E
Eric Dumazet 已提交
2122
		skb_orphan_try(skb);
2123

2124 2125
		features = netif_skb_features(skb);

2126
		if (vlan_tx_tag_present(skb) &&
2127
		    !(features & NETIF_F_HW_VLAN_TX)) {
2128 2129 2130 2131 2132 2133 2134
			skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
			if (unlikely(!skb))
				goto out;

			skb->vlan_tci = 0;
		}

2135
		if (netif_needs_gso(skb, features)) {
2136
			if (unlikely(dev_gso_segment(skb, features)))
2137 2138 2139
				goto out_kfree_skb;
			if (skb->next)
				goto gso;
2140
		} else {
2141
			if (skb_needs_linearize(skb, features) &&
2142 2143 2144 2145 2146 2147 2148 2149
			    __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) {
2150 2151
				skb_set_transport_header(skb,
					skb_checksum_start_offset(skb));
2152
				if (!(features & NETIF_F_ALL_CSUM) &&
2153 2154 2155
				     skb_checksum_help(skb))
					goto out_kfree_skb;
			}
2156 2157
		}

2158
		rc = ops->ndo_start_xmit(skb, dev);
2159
		trace_net_dev_xmit(skb, rc);
2160
		if (rc == NETDEV_TX_OK)
E
Eric Dumazet 已提交
2161
			txq_trans_update(txq);
2162
		return rc;
2163 2164
	}

2165
gso:
2166 2167 2168 2169 2170
	do {
		struct sk_buff *nskb = skb->next;

		skb->next = nskb->next;
		nskb->next = NULL;
2171 2172 2173 2174 2175 2176 2177 2178

		/*
		 * 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);

2179
		rc = ops->ndo_start_xmit(nskb, dev);
2180
		trace_net_dev_xmit(nskb, rc);
2181
		if (unlikely(rc != NETDEV_TX_OK)) {
2182 2183
			if (rc & ~NETDEV_TX_MASK)
				goto out_kfree_gso_skb;
2184
			nskb->next = skb->next;
2185 2186 2187
			skb->next = nskb;
			return rc;
		}
E
Eric Dumazet 已提交
2188
		txq_trans_update(txq);
2189
		if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
2190
			return NETDEV_TX_BUSY;
2191
	} while (skb->next);
2192

2193 2194 2195
out_kfree_gso_skb:
	if (likely(skb->next == NULL))
		skb->destructor = DEV_GSO_CB(skb)->destructor;
2196 2197
out_kfree_skb:
	kfree_skb(skb);
2198
out:
2199
	return rc;
2200 2201
}

T
Tom Herbert 已提交
2202
static u32 hashrnd __read_mostly;
D
David S. Miller 已提交
2203

2204 2205 2206 2207 2208 2209
/*
 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
 * to be used as a distribution range.
 */
u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb,
		  unsigned int num_tx_queues)
2210
{
2211
	u32 hash;
2212 2213
	u16 qoffset = 0;
	u16 qcount = num_tx_queues;
D
David S. Miller 已提交
2214

2215 2216
	if (skb_rx_queue_recorded(skb)) {
		hash = skb_get_rx_queue(skb);
2217 2218
		while (unlikely(hash >= num_tx_queues))
			hash -= num_tx_queues;
2219 2220
		return hash;
	}
2221

2222 2223 2224 2225 2226 2227
	if (dev->num_tc) {
		u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
		qoffset = dev->tc_to_txq[tc].offset;
		qcount = dev->tc_to_txq[tc].count;
	}

2228
	if (skb->sk && skb->sk->sk_hash)
2229
		hash = skb->sk->sk_hash;
2230
	else
2231
		hash = (__force u16) skb->protocol ^ skb->rxhash;
T
Tom Herbert 已提交
2232
	hash = jhash_1word(hash, hashrnd);
D
David S. Miller 已提交
2233

2234
	return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2235
}
2236
EXPORT_SYMBOL(__skb_tx_hash);
2237

2238 2239 2240 2241
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
2242 2243 2244
			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);
2245 2246 2247 2248 2249 2250
		}
		return 0;
	}
	return queue_index;
}

T
Tom Herbert 已提交
2251 2252
static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
{
T
Tom Herbert 已提交
2253
#ifdef CONFIG_XPS
T
Tom Herbert 已提交
2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288
	struct xps_dev_maps *dev_maps;
	struct xps_map *map;
	int queue_index = -1;

	rcu_read_lock();
	dev_maps = rcu_dereference(dev->xps_maps);
	if (dev_maps) {
		map = rcu_dereference(
		    dev_maps->cpu_map[raw_smp_processor_id()]);
		if (map) {
			if (map->len == 1)
				queue_index = map->queues[0];
			else {
				u32 hash;
				if (skb->sk && skb->sk->sk_hash)
					hash = skb->sk->sk_hash;
				else
					hash = (__force u16) skb->protocol ^
					    skb->rxhash;
				hash = jhash_1word(hash, hashrnd);
				queue_index = map->queues[
				    ((u64)hash * map->len) >> 32];
			}
			if (unlikely(queue_index >= dev->real_num_tx_queues))
				queue_index = -1;
		}
	}
	rcu_read_unlock();

	return queue_index;
#else
	return -1;
#endif
}

2289 2290 2291
static struct netdev_queue *dev_pick_tx(struct net_device *dev,
					struct sk_buff *skb)
{
2292
	int queue_index;
2293
	const struct net_device_ops *ops = dev->netdev_ops;
2294

2295 2296 2297
	if (dev->real_num_tx_queues == 1)
		queue_index = 0;
	else if (ops->ndo_select_queue) {
2298 2299 2300 2301 2302
		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);
2303

2304 2305 2306
		if (queue_index < 0 || skb->ooo_okay ||
		    queue_index >= dev->real_num_tx_queues) {
			int old_index = queue_index;
2307

T
Tom Herbert 已提交
2308 2309 2310
			queue_index = get_xps_queue(dev, skb);
			if (queue_index < 0)
				queue_index = skb_tx_hash(dev, skb);
2311 2312 2313 2314

			if (queue_index != old_index && sk) {
				struct dst_entry *dst =
				    rcu_dereference_check(sk->sk_dst_cache, 1);
E
Eric Dumazet 已提交
2315 2316 2317 2318

				if (dst && skb_dst(skb) == dst)
					sk_tx_queue_set(sk, queue_index);
			}
2319 2320
		}
	}
2321

2322 2323
	skb_set_queue_mapping(skb, queue_index);
	return netdev_get_tx_queue(dev, queue_index);
2324 2325
}

2326 2327 2328 2329 2330
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);
E
Eric Dumazet 已提交
2331
	bool contended;
2332 2333
	int rc;

E
Eric Dumazet 已提交
2334 2335
	qdisc_skb_cb(skb)->pkt_len = skb->len;
	qdisc_calculate_pkt_len(skb, q);
2336 2337 2338 2339 2340 2341
	/*
	 * 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.
	 */
E
Eric Dumazet 已提交
2342
	contended = qdisc_is_running(q);
2343 2344 2345
	if (unlikely(contended))
		spin_lock(&q->busylock);

2346 2347 2348 2349 2350
	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) &&
2351
		   qdisc_run_begin(q)) {
2352 2353 2354 2355 2356
		/*
		 * 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
2357 2358
		if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
			skb_dst_force(skb);
2359 2360 2361

		qdisc_bstats_update(q, skb);

2362 2363 2364 2365 2366
		if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
			if (unlikely(contended)) {
				spin_unlock(&q->busylock);
				contended = false;
			}
2367
			__qdisc_run(q);
2368
		} else
2369
			qdisc_run_end(q);
2370 2371 2372

		rc = NET_XMIT_SUCCESS;
	} else {
E
Eric Dumazet 已提交
2373
		skb_dst_force(skb);
E
Eric Dumazet 已提交
2374
		rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2375 2376 2377 2378 2379 2380 2381
		if (qdisc_run_begin(q)) {
			if (unlikely(contended)) {
				spin_unlock(&q->busylock);
				contended = false;
			}
			__qdisc_run(q);
		}
2382 2383
	}
	spin_unlock(root_lock);
2384 2385
	if (unlikely(contended))
		spin_unlock(&q->busylock);
2386 2387 2388
	return rc;
}

2389
static DEFINE_PER_CPU(int, xmit_recursion);
2390
#define RECURSION_LIMIT 10
2391

2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416
/**
 *	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
2417 2418 2419
int dev_queue_xmit(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
2420
	struct netdev_queue *txq;
L
Linus Torvalds 已提交
2421 2422 2423
	struct Qdisc *q;
	int rc = -ENOMEM;

2424 2425
	/* Disable soft irqs for various locks below. Also
	 * stops preemption for RCU.
L
Linus Torvalds 已提交
2426
	 */
2427
	rcu_read_lock_bh();
L
Linus Torvalds 已提交
2428

2429
	txq = dev_pick_tx(dev, skb);
2430
	q = rcu_dereference_bh(txq->qdisc);
2431

L
Linus Torvalds 已提交
2432
#ifdef CONFIG_NET_CLS_ACT
E
Eric Dumazet 已提交
2433
	skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
L
Linus Torvalds 已提交
2434
#endif
2435
	trace_net_dev_queue(skb);
L
Linus Torvalds 已提交
2436
	if (q->enqueue) {
2437
		rc = __dev_xmit_skb(skb, q, dev, txq);
2438
		goto out;
L
Linus Torvalds 已提交
2439 2440 2441 2442 2443
	}

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

H
Herbert Xu 已提交
2444 2445
	   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
2446 2447 2448 2449 2450 2451 2452 2453 2454 2455
	   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 */

2456
		if (txq->xmit_lock_owner != cpu) {
L
Linus Torvalds 已提交
2457

2458 2459 2460
			if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
				goto recursion_alert;

2461
			HARD_TX_LOCK(dev, txq, cpu);
L
Linus Torvalds 已提交
2462

2463
			if (!netif_tx_queue_stopped(txq)) {
2464
				__this_cpu_inc(xmit_recursion);
2465
				rc = dev_hard_start_xmit(skb, dev, txq);
2466
				__this_cpu_dec(xmit_recursion);
2467
				if (dev_xmit_complete(rc)) {
2468
					HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
2469 2470 2471
					goto out;
				}
			}
2472
			HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
2473 2474 2475 2476 2477
			if (net_ratelimit())
				printk(KERN_CRIT "Virtual device %s asks to "
				       "queue packet!\n", dev->name);
		} else {
			/* Recursion is detected! It is possible,
2478 2479 2480
			 * unfortunately
			 */
recursion_alert:
L
Linus Torvalds 已提交
2481 2482 2483 2484 2485 2486 2487
			if (net_ratelimit())
				printk(KERN_CRIT "Dead loop on virtual device "
				       "%s, fix it urgently!\n", dev->name);
		}
	}

	rc = -ENETDOWN;
2488
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
2489 2490 2491 2492

	kfree_skb(skb);
	return rc;
out:
2493
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
2494 2495
	return rc;
}
E
Eric Dumazet 已提交
2496
EXPORT_SYMBOL(dev_queue_xmit);
L
Linus Torvalds 已提交
2497 2498 2499 2500 2501 2502


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

2503
int netdev_max_backlog __read_mostly = 1000;
E
Eric Dumazet 已提交
2504
int netdev_tstamp_prequeue __read_mostly = 1;
2505 2506
int netdev_budget __read_mostly = 300;
int weight_p __read_mostly = 64;            /* old backlog weight */
L
Linus Torvalds 已提交
2507

E
Eric Dumazet 已提交
2508 2509 2510 2511 2512 2513 2514 2515
/* 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
2516
/*
2517 2518 2519
 * __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
2520
 */
2521
__u32 __skb_get_rxhash(struct sk_buff *skb)
T
Tom Herbert 已提交
2522
{
2523
	int nhoff, hash = 0, poff;
T
Tom Herbert 已提交
2524 2525 2526
	struct ipv6hdr *ip6;
	struct iphdr *ip;
	u8 ip_proto;
C
Changli Gao 已提交
2527 2528 2529 2530 2531
	u32 addr1, addr2, ihl;
	union {
		u32 v32;
		u16 v16[2];
	} ports;
T
Tom Herbert 已提交
2532

2533
	nhoff = skb_network_offset(skb);
T
Tom Herbert 已提交
2534 2535 2536

	switch (skb->protocol) {
	case __constant_htons(ETH_P_IP):
2537
		if (!pskb_may_pull(skb, sizeof(*ip) + nhoff))
T
Tom Herbert 已提交
2538 2539
			goto done;

2540
		ip = (struct iphdr *) (skb->data + nhoff);
2541 2542 2543 2544
		if (ip->frag_off & htons(IP_MF | IP_OFFSET))
			ip_proto = 0;
		else
			ip_proto = ip->protocol;
E
Eric Dumazet 已提交
2545 2546
		addr1 = (__force u32) ip->saddr;
		addr2 = (__force u32) ip->daddr;
T
Tom Herbert 已提交
2547 2548 2549
		ihl = ip->ihl;
		break;
	case __constant_htons(ETH_P_IPV6):
2550
		if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff))
T
Tom Herbert 已提交
2551 2552
			goto done;

2553
		ip6 = (struct ipv6hdr *) (skb->data + nhoff);
T
Tom Herbert 已提交
2554
		ip_proto = ip6->nexthdr;
E
Eric Dumazet 已提交
2555 2556
		addr1 = (__force u32) ip6->saddr.s6_addr32[3];
		addr2 = (__force u32) ip6->daddr.s6_addr32[3];
T
Tom Herbert 已提交
2557 2558 2559 2560 2561
		ihl = (40 >> 2);
		break;
	default:
		goto done;
	}
2562

2563 2564 2565 2566 2567 2568
	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
2569 2570
			if (ports.v16[1] < ports.v16[0])
				swap(ports.v16[0], ports.v16[1]);
E
Eric Dumazet 已提交
2571
		}
T
Tom Herbert 已提交
2572 2573
	}

E
Eric Dumazet 已提交
2574 2575 2576
	/* get a consistent hash (same value on both flow directions) */
	if (addr2 < addr1)
		swap(addr1, addr2);
T
Tom Herbert 已提交
2577

2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589
	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. */
E
Eric Dumazet 已提交
2590
struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2591 2592
EXPORT_SYMBOL(rps_sock_flow_table);

2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 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 2639
static struct rps_dev_flow *
set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
	    struct rps_dev_flow *rflow, u16 next_cpu)
{
	u16 tcpu;

	tcpu = rflow->cpu = next_cpu;
	if (tcpu != RPS_NO_CPU) {
#ifdef CONFIG_RFS_ACCEL
		struct netdev_rx_queue *rxqueue;
		struct rps_dev_flow_table *flow_table;
		struct rps_dev_flow *old_rflow;
		u32 flow_id;
		u16 rxq_index;
		int rc;

		/* Should we steer this flow to a different hardware queue? */
		if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap)
			goto out;
		rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
		if (rxq_index == skb_get_rx_queue(skb))
			goto out;

		rxqueue = dev->_rx + rxq_index;
		flow_table = rcu_dereference(rxqueue->rps_flow_table);
		if (!flow_table)
			goto out;
		flow_id = skb->rxhash & flow_table->mask;
		rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
							rxq_index, flow_id);
		if (rc < 0)
			goto out;
		old_rflow = rflow;
		rflow = &flow_table->flows[flow_id];
		rflow->cpu = next_cpu;
		rflow->filter = rc;
		if (old_rflow->filter == rflow->filter)
			old_rflow->filter = RPS_NO_FILTER;
	out:
#endif
		rflow->last_qtail =
			per_cpu(softnet_data, tcpu).input_queue_head;
	}

	return rflow;
}

2640 2641 2642 2643 2644 2645 2646 2647 2648
/*
 * 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;
E
Eric Dumazet 已提交
2649
	struct rps_map *map;
2650 2651 2652 2653 2654 2655 2656
	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);
2657 2658 2659 2660 2661
		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);
2662 2663 2664 2665 2666 2667
			goto done;
		}
		rxqueue = dev->_rx + index;
	} else
		rxqueue = dev->_rx;

E
Eric Dumazet 已提交
2668 2669
	map = rcu_dereference(rxqueue->rps_map);
	if (map) {
2670 2671
		if (map->len == 1 &&
		    !rcu_dereference_raw(rxqueue->rps_flow_table)) {
2672 2673 2674 2675 2676
			tcpu = map->cpus[0];
			if (cpu_online(tcpu))
				cpu = tcpu;
			goto done;
		}
E
Eric Dumazet 已提交
2677
	} else if (!rcu_dereference_raw(rxqueue->rps_flow_table)) {
2678
		goto done;
2679
	}
2680

2681
	skb_reset_network_header(skb);
2682 2683 2684
	if (!skb_get_rxhash(skb))
		goto done;

T
Tom Herbert 已提交
2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710
	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 -
2711 2712 2713
		      rflow->last_qtail)) >= 0))
			rflow = set_rps_cpu(dev, skb, rflow, next_cpu);

T
Tom Herbert 已提交
2714 2715 2716 2717 2718 2719 2720
		if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
			*rflowp = rflow;
			cpu = tcpu;
			goto done;
		}
	}

T
Tom Herbert 已提交
2721
	if (map) {
T
Tom Herbert 已提交
2722
		tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
T
Tom Herbert 已提交
2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733

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

done:
	return cpu;
}

2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773
#ifdef CONFIG_RFS_ACCEL

/**
 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
 * @dev: Device on which the filter was set
 * @rxq_index: RX queue index
 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
 *
 * Drivers that implement ndo_rx_flow_steer() should periodically call
 * this function for each installed filter and remove the filters for
 * which it returns %true.
 */
bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
			 u32 flow_id, u16 filter_id)
{
	struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
	struct rps_dev_flow_table *flow_table;
	struct rps_dev_flow *rflow;
	bool expire = true;
	int cpu;

	rcu_read_lock();
	flow_table = rcu_dereference(rxqueue->rps_flow_table);
	if (flow_table && flow_id <= flow_table->mask) {
		rflow = &flow_table->flows[flow_id];
		cpu = ACCESS_ONCE(rflow->cpu);
		if (rflow->filter == filter_id && cpu != RPS_NO_CPU &&
		    ((int)(per_cpu(softnet_data, cpu).input_queue_head -
			   rflow->last_qtail) <
		     (int)(10 * flow_table->mask)))
			expire = false;
	}
	rcu_read_unlock();
	return expire;
}
EXPORT_SYMBOL(rps_may_expire_flow);

#endif /* CONFIG_RFS_ACCEL */

T
Tom Herbert 已提交
2774
/* Called from hardirq (IPI) context */
E
Eric Dumazet 已提交
2775
static void rps_trigger_softirq(void *data)
T
Tom Herbert 已提交
2776
{
E
Eric Dumazet 已提交
2777 2778
	struct softnet_data *sd = data;

E
Eric Dumazet 已提交
2779
	____napi_schedule(sd, &sd->backlog);
C
Changli Gao 已提交
2780
	sd->received_rps++;
T
Tom Herbert 已提交
2781
}
E
Eric Dumazet 已提交
2782

T
Tom Herbert 已提交
2783
#endif /* CONFIG_RPS */
T
Tom Herbert 已提交
2784

E
Eric Dumazet 已提交
2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805
/*
 * 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
2806 2807 2808 2809
/*
 * 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
2810 2811
static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
			      unsigned int *qtail)
T
Tom Herbert 已提交
2812
{
E
Eric Dumazet 已提交
2813
	struct softnet_data *sd;
T
Tom Herbert 已提交
2814 2815
	unsigned long flags;

E
Eric Dumazet 已提交
2816
	sd = &per_cpu(softnet_data, cpu);
T
Tom Herbert 已提交
2817 2818 2819

	local_irq_save(flags);

E
Eric Dumazet 已提交
2820
	rps_lock(sd);
2821 2822
	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
2823
enqueue:
E
Eric Dumazet 已提交
2824
			__skb_queue_tail(&sd->input_pkt_queue, skb);
2825
			input_queue_tail_incr_save(sd, qtail);
E
Eric Dumazet 已提交
2826
			rps_unlock(sd);
2827
			local_irq_restore(flags);
T
Tom Herbert 已提交
2828 2829 2830
			return NET_RX_SUCCESS;
		}

2831 2832 2833 2834
		/* 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
2835
			if (!rps_ipi_queued(sd))
E
Eric Dumazet 已提交
2836
				____napi_schedule(sd, &sd->backlog);
T
Tom Herbert 已提交
2837 2838 2839 2840
		}
		goto enqueue;
	}

C
Changli Gao 已提交
2841
	sd->dropped++;
E
Eric Dumazet 已提交
2842
	rps_unlock(sd);
T
Tom Herbert 已提交
2843 2844 2845

	local_irq_restore(flags);

2846
	atomic_long_inc(&skb->dev->rx_dropped);
T
Tom Herbert 已提交
2847 2848 2849
	kfree_skb(skb);
	return NET_RX_DROP;
}
L
Linus Torvalds 已提交
2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867

/**
 *	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)
{
2868
	int ret;
L
Linus Torvalds 已提交
2869 2870 2871 2872 2873

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

E
Eric Dumazet 已提交
2874 2875
	if (netdev_tstamp_prequeue)
		net_timestamp_check(skb);
L
Linus Torvalds 已提交
2876

2877
	trace_netif_rx(skb);
E
Eric Dumazet 已提交
2878
#ifdef CONFIG_RPS
2879
	{
T
Tom Herbert 已提交
2880
		struct rps_dev_flow voidflow, *rflow = &voidflow;
2881 2882
		int cpu;

2883
		preempt_disable();
2884
		rcu_read_lock();
T
Tom Herbert 已提交
2885 2886

		cpu = get_rps_cpu(skb->dev, skb, &rflow);
2887 2888
		if (cpu < 0)
			cpu = smp_processor_id();
T
Tom Herbert 已提交
2889 2890 2891

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

2892
		rcu_read_unlock();
2893
		preempt_enable();
2894
	}
2895
#else
T
Tom Herbert 已提交
2896 2897 2898 2899 2900
	{
		unsigned int qtail;
		ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
		put_cpu();
	}
2901
#endif
2902
	return ret;
L
Linus Torvalds 已提交
2903
}
E
Eric Dumazet 已提交
2904
EXPORT_SYMBOL(netif_rx);
L
Linus Torvalds 已提交
2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935

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;

2936
			WARN_ON(atomic_read(&skb->users));
2937
			trace_kfree_skb(skb, net_tx_action);
L
Linus Torvalds 已提交
2938 2939 2940 2941 2942
			__kfree_skb(skb);
		}
	}

	if (sd->output_queue) {
2943
		struct Qdisc *head;
L
Linus Torvalds 已提交
2944 2945 2946 2947

		local_irq_disable();
		head = sd->output_queue;
		sd->output_queue = NULL;
2948
		sd->output_queue_tailp = &sd->output_queue;
L
Linus Torvalds 已提交
2949 2950 2951
		local_irq_enable();

		while (head) {
2952 2953 2954
			struct Qdisc *q = head;
			spinlock_t *root_lock;

L
Linus Torvalds 已提交
2955 2956
			head = head->next_sched;

2957
			root_lock = qdisc_lock(q);
2958
			if (spin_trylock(root_lock)) {
2959 2960 2961
				smp_mb__before_clear_bit();
				clear_bit(__QDISC_STATE_SCHED,
					  &q->state);
2962 2963
				qdisc_run(q);
				spin_unlock(root_lock);
L
Linus Torvalds 已提交
2964
			} else {
2965
				if (!test_bit(__QDISC_STATE_DEACTIVATED,
2966
					      &q->state)) {
2967
					__netif_reschedule(q);
2968 2969 2970 2971 2972
				} else {
					smp_mb__before_clear_bit();
					clear_bit(__QDISC_STATE_SCHED,
						  &q->state);
				}
L
Linus Torvalds 已提交
2973 2974 2975 2976 2977
			}
		}
	}
}

2978 2979
#if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
    (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
2980 2981 2982
/* This hook is defined here for ATM LANE */
int (*br_fdb_test_addr_hook)(struct net_device *dev,
			     unsigned char *addr) __read_mostly;
2983
EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2984
#endif
L
Linus Torvalds 已提交
2985 2986 2987 2988 2989 2990

#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
2991
 * NOTE: This doesnt stop any functionality; if you dont have
L
Linus Torvalds 已提交
2992 2993 2994
 * the ingress scheduler, you just cant add policies on ingress.
 *
 */
2995
static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
L
Linus Torvalds 已提交
2996 2997
{
	struct net_device *dev = skb->dev;
2998
	u32 ttl = G_TC_RTTL(skb->tc_verd);
2999 3000
	int result = TC_ACT_OK;
	struct Qdisc *q;
3001

3002 3003 3004 3005
	if (unlikely(MAX_RED_LOOP < ttl++)) {
		if (net_ratelimit())
			pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
			       skb->skb_iif, dev->ifindex);
3006 3007
		return TC_ACT_SHOT;
	}
L
Linus Torvalds 已提交
3008

3009 3010
	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
3011

3012
	q = rxq->qdisc;
3013
	if (q != &noop_qdisc) {
3014
		spin_lock(qdisc_lock(q));
3015 3016
		if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
			result = qdisc_enqueue_root(skb, q);
3017 3018
		spin_unlock(qdisc_lock(q));
	}
3019 3020 3021

	return result;
}
3022

3023 3024 3025 3026
static inline struct sk_buff *handle_ing(struct sk_buff *skb,
					 struct packet_type **pt_prev,
					 int *ret, struct net_device *orig_dev)
{
3027 3028 3029
	struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);

	if (!rxq || rxq->qdisc == &noop_qdisc)
3030
		goto out;
L
Linus Torvalds 已提交
3031

3032 3033 3034
	if (*pt_prev) {
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
		*pt_prev = NULL;
L
Linus Torvalds 已提交
3035 3036
	}

3037
	switch (ing_filter(skb, rxq)) {
3038 3039 3040 3041 3042 3043 3044 3045 3046
	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
3047 3048 3049
}
#endif

3050 3051 3052 3053
/**
 *	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
3054
 *	@rx_handler_data: data pointer that is used by rx handler
3055 3056 3057 3058 3059 3060 3061 3062
 *
 *	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
3063 3064
			       rx_handler_func_t *rx_handler,
			       void *rx_handler_data)
3065 3066 3067 3068 3069 3070
{
	ASSERT_RTNL();

	if (dev->rx_handler)
		return -EBUSY;

J
Jiri Pirko 已提交
3071
	rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090
	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
3091
	rcu_assign_pointer(dev->rx_handler_data, NULL);
3092 3093 3094
}
EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);

3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108
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.
 */
3109 3110
static int __skb_bond_should_drop(struct sk_buff *skb,
				  struct net_device *master)
3111 3112 3113 3114 3115 3116
{
	struct net_device *dev = skb->dev;

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

3117 3118
	if ((master->priv_flags & IFF_MASTER_ALB) &&
	    (master->priv_flags & IFF_BRIDGE_PORT)) {
3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144
		/* 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;
}

3145
static int __netif_receive_skb(struct sk_buff *skb)
L
Linus Torvalds 已提交
3146 3147
{
	struct packet_type *ptype, *pt_prev;
3148
	rx_handler_func_t *rx_handler;
D
David S. Miller 已提交
3149
	struct net_device *orig_dev;
3150
	struct net_device *null_or_orig;
3151
	struct net_device *orig_or_bond;
L
Linus Torvalds 已提交
3152
	int ret = NET_RX_DROP;
A
Al Viro 已提交
3153
	__be16 type;
L
Linus Torvalds 已提交
3154

E
Eric Dumazet 已提交
3155 3156
	if (!netdev_tstamp_prequeue)
		net_timestamp_check(skb);
3157

3158
	trace_netif_receive_skb(skb);
3159

L
Linus Torvalds 已提交
3160
	/* if we've gotten here through NAPI, check netpoll */
3161
	if (netpoll_receive_skb(skb))
L
Linus Torvalds 已提交
3162 3163
		return NET_RX_DROP;

3164 3165
	if (!skb->skb_iif)
		skb->skb_iif = skb->dev->ifindex;
3166

3167 3168 3169 3170 3171
	/*
	 * 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
3172
	 * be dropped at the handler.
3173
	 */
3174
	null_or_orig = NULL;
J
Joe Eykholt 已提交
3175
	orig_dev = skb->dev;
3176 3177
	if (skb->deliver_no_wcard)
		null_or_orig = orig_dev;
J
Jiri Pirko 已提交
3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188
	else if (netif_is_bond_slave(orig_dev)) {
		struct net_device *bond_master = ACCESS_ONCE(orig_dev->master);

		if (likely(bond_master)) {
			if (__skb_bond_should_drop(skb, bond_master)) {
				skb->deliver_no_wcard = 1;
				/* deliver only exact match */
				null_or_orig = orig_dev;
			} else
				skb->dev = bond_master;
		}
J
Joe Eykholt 已提交
3189
	}
3190

3191
	__this_cpu_inc(softnet_data.processed);
3192
	skb_reset_network_header(skb);
3193
	skb_reset_transport_header(skb);
3194
	skb->mac_len = skb->network_header - skb->mac_header;
L
Linus Torvalds 已提交
3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207

	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) {
3208 3209
		if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
		    ptype->dev == orig_dev) {
3210
			if (pt_prev)
D
David S. Miller 已提交
3211
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
3212 3213 3214 3215 3216
			pt_prev = ptype;
		}
	}

#ifdef CONFIG_NET_CLS_ACT
3217 3218
	skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
	if (!skb)
L
Linus Torvalds 已提交
3219 3220 3221 3222
		goto out;
ncls:
#endif

3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233
	/* 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
3234

3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246
	if (vlan_tx_tag_present(skb)) {
		if (pt_prev) {
			ret = deliver_skb(skb, pt_prev, orig_dev);
			pt_prev = NULL;
		}
		if (vlan_hwaccel_do_receive(&skb)) {
			ret = __netif_receive_skb(skb);
			goto out;
		} else if (unlikely(!skb))
			goto out;
	}

3247 3248 3249 3250 3251 3252
	/*
	 * 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.
	 */
3253
	orig_or_bond = orig_dev;
3254 3255
	if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
	    (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
3256
		orig_or_bond = vlan_dev_real_dev(skb->dev);
3257 3258
	}

L
Linus Torvalds 已提交
3259
	type = skb->protocol;
3260 3261
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3262
		if (ptype->type == type && (ptype->dev == null_or_orig ||
3263
		     ptype->dev == skb->dev || ptype->dev == orig_dev ||
3264
		     ptype->dev == orig_or_bond)) {
3265
			if (pt_prev)
D
David S. Miller 已提交
3266
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
3267 3268 3269 3270 3271
			pt_prev = ptype;
		}
	}

	if (pt_prev) {
D
David S. Miller 已提交
3272
		ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
3273
	} else {
3274
		atomic_long_inc(&skb->dev->rx_dropped);
L
Linus Torvalds 已提交
3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285
		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
3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303

/**
 *	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
3304 3305 3306
	if (netdev_tstamp_prequeue)
		net_timestamp_check(skb);

3307 3308 3309
	if (skb_defer_rx_timestamp(skb))
		return NET_RX_SUCCESS;

E
Eric Dumazet 已提交
3310
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
3311 3312 3313
	{
		struct rps_dev_flow voidflow, *rflow = &voidflow;
		int cpu, ret;
T
Tom Herbert 已提交
3314

E
Eric Dumazet 已提交
3315 3316 3317
		rcu_read_lock();

		cpu = get_rps_cpu(skb->dev, skb, &rflow);
T
Tom Herbert 已提交
3318

E
Eric Dumazet 已提交
3319 3320 3321 3322 3323 3324 3325
		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
3326

E
Eric Dumazet 已提交
3327
		return ret;
T
Tom Herbert 已提交
3328
	}
3329 3330 3331
#else
	return __netif_receive_skb(skb);
#endif
T
Tom Herbert 已提交
3332
}
E
Eric Dumazet 已提交
3333
EXPORT_SYMBOL(netif_receive_skb);
L
Linus Torvalds 已提交
3334

E
Eric Dumazet 已提交
3335 3336 3337
/* Network device is going away, flush any packets still pending
 * Called with irqs disabled.
 */
3338
static void flush_backlog(void *arg)
3339
{
3340
	struct net_device *dev = arg;
E
Eric Dumazet 已提交
3341
	struct softnet_data *sd = &__get_cpu_var(softnet_data);
3342 3343
	struct sk_buff *skb, *tmp;

E
Eric Dumazet 已提交
3344
	rps_lock(sd);
3345
	skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3346
		if (skb->dev == dev) {
E
Eric Dumazet 已提交
3347
			__skb_unlink(skb, &sd->input_pkt_queue);
3348
			kfree_skb(skb);
3349
			input_queue_head_incr(sd);
3350
		}
3351
	}
E
Eric Dumazet 已提交
3352
	rps_unlock(sd);
3353 3354 3355 3356 3357

	skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
		if (skb->dev == dev) {
			__skb_unlink(skb, &sd->process_queue);
			kfree_skb(skb);
3358
			input_queue_head_incr(sd);
3359 3360
		}
	}
3361 3362
}

3363 3364 3365 3366 3367 3368 3369
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;

3370 3371
	if (NAPI_GRO_CB(skb)->count == 1) {
		skb_shinfo(skb)->gso_size = 0;
3372
		goto out;
3373
	}
3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394

	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
3395
inline void napi_gro_flush(struct napi_struct *napi)
3396 3397 3398 3399 3400 3401 3402 3403 3404
{
	struct sk_buff *skb, *next;

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

3405
	napi->gro_count = 0;
3406 3407
	napi->gro_list = NULL;
}
E
Eric Dumazet 已提交
3408
EXPORT_SYMBOL(napi_gro_flush);
3409

3410
enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3411 3412 3413 3414 3415
{
	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
3416
	int same_flow;
3417
	int mac_len;
3418
	enum gro_result ret;
3419

3420
	if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3421 3422
		goto normal;

3423
	if (skb_is_gso(skb) || skb_has_frag_list(skb))
3424 3425
		goto normal;

3426 3427 3428 3429 3430
	rcu_read_lock();
	list_for_each_entry_rcu(ptype, head, list) {
		if (ptype->type != type || ptype->dev || !ptype->gro_receive)
			continue;

3431
		skb_set_network_header(skb, skb_gro_offset(skb));
3432 3433 3434 3435
		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
3436
		NAPI_GRO_CB(skb)->free = 0;
3437 3438 3439 3440 3441 3442 3443 3444 3445

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

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

H
Herbert Xu 已提交
3446
	same_flow = NAPI_GRO_CB(skb)->same_flow;
3447
	ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
H
Herbert Xu 已提交
3448

3449 3450 3451 3452 3453 3454
	if (pp) {
		struct sk_buff *nskb = *pp;

		*pp = nskb->next;
		nskb->next = NULL;
		napi_gro_complete(nskb);
3455
		napi->gro_count--;
3456 3457
	}

H
Herbert Xu 已提交
3458
	if (same_flow)
3459 3460
		goto ok;

3461
	if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3462 3463
		goto normal;

3464
	napi->gro_count++;
3465
	NAPI_GRO_CB(skb)->count = 1;
3466
	skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3467 3468
	skb->next = napi->gro_list;
	napi->gro_list = skb;
3469
	ret = GRO_HELD;
3470

3471
pull:
H
Herbert Xu 已提交
3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488
	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,
3489
				--skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
H
Herbert Xu 已提交
3490
		}
3491 3492
	}

3493
ok:
3494
	return ret;
3495 3496

normal:
3497 3498
	ret = GRO_NORMAL;
	goto pull;
H
Herbert Xu 已提交
3499
}
3500 3501
EXPORT_SYMBOL(dev_gro_receive);

3502
static inline gro_result_t
3503
__napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3504 3505 3506 3507
{
	struct sk_buff *p;

	for (p = napi->gro_list; p; p = p->next) {
3508 3509 3510
		unsigned long diffs;

		diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3511
		diffs |= p->vlan_tci ^ skb->vlan_tci;
3512
		diffs |= compare_ether_header(skb_mac_header(p),
3513
					      skb_gro_mac_header(skb));
3514
		NAPI_GRO_CB(p)->same_flow = !diffs;
3515 3516 3517 3518 3519
		NAPI_GRO_CB(p)->flush = 0;
	}

	return dev_gro_receive(napi, skb);
}
H
Herbert Xu 已提交
3520

3521
gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
H
Herbert Xu 已提交
3522
{
3523 3524
	switch (ret) {
	case GRO_NORMAL:
3525 3526 3527
		if (netif_receive_skb(skb))
			ret = GRO_DROP;
		break;
H
Herbert Xu 已提交
3528

3529 3530
	case GRO_DROP:
	case GRO_MERGED_FREE:
H
Herbert Xu 已提交
3531 3532
		kfree_skb(skb);
		break;
3533 3534 3535 3536

	case GRO_HELD:
	case GRO_MERGED:
		break;
H
Herbert Xu 已提交
3537 3538
	}

3539
	return ret;
3540 3541 3542
}
EXPORT_SYMBOL(napi_skb_finish);

3543 3544 3545 3546
void skb_gro_reset_offset(struct sk_buff *skb)
{
	NAPI_GRO_CB(skb)->data_offset = 0;
	NAPI_GRO_CB(skb)->frag0 = NULL;
3547
	NAPI_GRO_CB(skb)->frag0_len = 0;
3548

3549
	if (skb->mac_header == skb->tail &&
3550
	    !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3551 3552 3553
		NAPI_GRO_CB(skb)->frag0 =
			page_address(skb_shinfo(skb)->frags[0].page) +
			skb_shinfo(skb)->frags[0].page_offset;
3554 3555
		NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
	}
3556 3557 3558
}
EXPORT_SYMBOL(skb_gro_reset_offset);

3559
gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3560
{
3561 3562
	skb_gro_reset_offset(skb);

3563
	return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3564 3565 3566
}
EXPORT_SYMBOL(napi_gro_receive);

S
stephen hemminger 已提交
3567
static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3568 3569 3570
{
	__skb_pull(skb, skb_headlen(skb));
	skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3571
	skb->vlan_tci = 0;
H
Herbert Xu 已提交
3572
	skb->dev = napi->dev;
A
Andy Gospodarek 已提交
3573
	skb->skb_iif = 0;
3574 3575 3576 3577

	napi->skb = skb;
}

3578
struct sk_buff *napi_get_frags(struct napi_struct *napi)
H
Herbert Xu 已提交
3579 3580 3581 3582
{
	struct sk_buff *skb = napi->skb;

	if (!skb) {
3583 3584 3585
		skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
		if (skb)
			napi->skb = skb;
3586
	}
3587 3588
	return skb;
}
3589
EXPORT_SYMBOL(napi_get_frags);
3590

3591 3592
gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
			       gro_result_t ret)
3593
{
3594 3595
	switch (ret) {
	case GRO_NORMAL:
3596
	case GRO_HELD:
3597
		skb->protocol = eth_type_trans(skb, skb->dev);
3598

3599 3600 3601 3602
		if (ret == GRO_HELD)
			skb_gro_pull(skb, -ETH_HLEN);
		else if (netif_receive_skb(skb))
			ret = GRO_DROP;
3603
		break;
H
Herbert Xu 已提交
3604

3605 3606 3607 3608
	case GRO_DROP:
	case GRO_MERGED_FREE:
		napi_reuse_skb(napi, skb);
		break;
3609 3610 3611

	case GRO_MERGED:
		break;
3612
	}
H
Herbert Xu 已提交
3613

3614
	return ret;
H
Herbert Xu 已提交
3615
}
3616 3617
EXPORT_SYMBOL(napi_frags_finish);

3618 3619 3620 3621
struct sk_buff *napi_frags_skb(struct napi_struct *napi)
{
	struct sk_buff *skb = napi->skb;
	struct ethhdr *eth;
3622 3623
	unsigned int hlen;
	unsigned int off;
3624 3625 3626 3627 3628 3629

	napi->skb = NULL;

	skb_reset_mac_header(skb);
	skb_gro_reset_offset(skb);

3630 3631 3632 3633 3634 3635 3636 3637 3638 3639
	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;
		}
3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654
	}

	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);

3655
gro_result_t napi_gro_frags(struct napi_struct *napi)
3656
{
3657
	struct sk_buff *skb = napi_frags_skb(napi);
3658 3659

	if (!skb)
3660
		return GRO_DROP;
3661 3662 3663

	return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
}
H
Herbert Xu 已提交
3664 3665
EXPORT_SYMBOL(napi_gro_frags);

3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693
/*
 * 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();
}

3694
static int process_backlog(struct napi_struct *napi, int quota)
L
Linus Torvalds 已提交
3695 3696
{
	int work = 0;
E
Eric Dumazet 已提交
3697
	struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
L
Linus Torvalds 已提交
3698

3699 3700 3701 3702 3703 3704 3705 3706 3707
#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
3708
	napi->weight = weight_p;
3709 3710
	local_irq_disable();
	while (work < quota) {
L
Linus Torvalds 已提交
3711
		struct sk_buff *skb;
3712 3713 3714 3715 3716 3717
		unsigned int qlen;

		while ((skb = __skb_dequeue(&sd->process_queue))) {
			local_irq_enable();
			__netif_receive_skb(skb);
			local_irq_disable();
3718 3719 3720 3721 3722
			input_queue_head_incr(sd);
			if (++work >= quota) {
				local_irq_enable();
				return work;
			}
3723
		}
L
Linus Torvalds 已提交
3724

E
Eric Dumazet 已提交
3725
		rps_lock(sd);
3726
		qlen = skb_queue_len(&sd->input_pkt_queue);
3727
		if (qlen)
3728 3729
			skb_queue_splice_tail_init(&sd->input_pkt_queue,
						   &sd->process_queue);
3730

3731
		if (qlen < quota - work) {
E
Eric Dumazet 已提交
3732 3733 3734 3735 3736 3737 3738 3739 3740 3741
			/*
			 * 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;

3742
			quota = work + qlen;
3743
		}
E
Eric Dumazet 已提交
3744
		rps_unlock(sd);
3745 3746
	}
	local_irq_enable();
L
Linus Torvalds 已提交
3747

3748 3749
	return work;
}
L
Linus Torvalds 已提交
3750

3751 3752
/**
 * __napi_schedule - schedule for receive
3753
 * @n: entry to schedule
3754 3755 3756
 *
 * The entry's receive function will be scheduled to run
 */
H
Harvey Harrison 已提交
3757
void __napi_schedule(struct napi_struct *n)
3758 3759
{
	unsigned long flags;
L
Linus Torvalds 已提交
3760

3761
	local_irq_save(flags);
E
Eric Dumazet 已提交
3762
	____napi_schedule(&__get_cpu_var(softnet_data), n);
3763
	local_irq_restore(flags);
L
Linus Torvalds 已提交
3764
}
3765 3766
EXPORT_SYMBOL(__napi_schedule);

3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799
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);
3800
	napi->gro_count = 0;
3801
	napi->gro_list = NULL;
H
Herbert Xu 已提交
3802
	napi->skb = NULL;
3803 3804 3805 3806
	napi->poll = poll;
	napi->weight = weight;
	list_add(&napi->dev_list, &dev->napi_list);
	napi->dev = dev;
H
Herbert Xu 已提交
3807
#ifdef CONFIG_NETPOLL
3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818
	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;

3819
	list_del_init(&napi->dev_list);
3820
	napi_free_frags(napi);
3821 3822 3823 3824 3825 3826 3827 3828

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

	napi->gro_list = NULL;
3829
	napi->gro_count = 0;
3830 3831 3832
}
EXPORT_SYMBOL(netif_napi_del);

L
Linus Torvalds 已提交
3833 3834
static void net_rx_action(struct softirq_action *h)
{
3835
	struct softnet_data *sd = &__get_cpu_var(softnet_data);
3836
	unsigned long time_limit = jiffies + 2;
3837
	int budget = netdev_budget;
3838 3839
	void *have;

L
Linus Torvalds 已提交
3840 3841
	local_irq_disable();

3842
	while (!list_empty(&sd->poll_list)) {
3843 3844
		struct napi_struct *n;
		int work, weight;
L
Linus Torvalds 已提交
3845

3846
		/* If softirq window is exhuasted then punt.
3847 3848
		 * Allow this to run for 2 jiffies since which will allow
		 * an average latency of 1.5/HZ.
3849
		 */
3850
		if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
L
Linus Torvalds 已提交
3851 3852 3853 3854
			goto softnet_break;

		local_irq_enable();

3855 3856 3857 3858 3859
		/* 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.
		 */
3860
		n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
L
Linus Torvalds 已提交
3861

3862 3863 3864 3865
		have = netpoll_poll_lock(n);

		weight = n->weight;

3866 3867 3868 3869 3870 3871 3872
		/* 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;
3873
		if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3874
			work = n->poll(n, weight);
3875 3876
			trace_napi_poll(n);
		}
3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887 3888

		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.
		 */
3889
		if (unlikely(work == weight)) {
3890 3891 3892 3893 3894
			if (unlikely(napi_disable_pending(n))) {
				local_irq_enable();
				napi_complete(n);
				local_irq_disable();
			} else
3895
				list_move_tail(&n->poll_list, &sd->poll_list);
3896
		}
3897 3898

		netpoll_poll_unlock(have);
L
Linus Torvalds 已提交
3899 3900
	}
out:
3901
	net_rps_action_and_irq_enable(sd);
T
Tom Herbert 已提交
3902

3903 3904 3905 3906 3907
#ifdef CONFIG_NET_DMA
	/*
	 * There may not be any more sk_buffs coming right now, so push
	 * any pending DMA copies to hardware
	 */
3908
	dma_issue_pending_all();
3909
#endif
3910

L
Linus Torvalds 已提交
3911 3912 3913
	return;

softnet_break:
C
Changli Gao 已提交
3914
	sd->time_squeeze++;
L
Linus Torvalds 已提交
3915 3916 3917 3918
	__raise_softirq_irqoff(NET_RX_SOFTIRQ);
	goto out;
}

E
Eric Dumazet 已提交
3919
static gifconf_func_t *gifconf_list[NPROTO];
L
Linus Torvalds 已提交
3920 3921 3922 3923 3924 3925 3926 3927 3928 3929

/**
 *	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
3930
int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
L
Linus Torvalds 已提交
3931 3932 3933 3934 3935 3936
{
	if (family >= NPROTO)
		return -EINVAL;
	gifconf_list[family] = gifconf;
	return 0;
}
E
Eric Dumazet 已提交
3937
EXPORT_SYMBOL(register_gifconf);
L
Linus Torvalds 已提交
3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950


/*
 *	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
 */

3951
static int dev_ifname(struct net *net, struct ifreq __user *arg)
L
Linus Torvalds 已提交
3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962
{
	struct net_device *dev;
	struct ifreq ifr;

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

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

3963 3964
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
L
Linus Torvalds 已提交
3965
	if (!dev) {
3966
		rcu_read_unlock();
L
Linus Torvalds 已提交
3967 3968 3969 3970
		return -ENODEV;
	}

	strcpy(ifr.ifr_name, dev->name);
3971
	rcu_read_unlock();
L
Linus Torvalds 已提交
3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983

	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'.
 */

3984
static int dev_ifconf(struct net *net, char __user *arg)
L
Linus Torvalds 已提交
3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007
{
	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;
4008
	for_each_netdev(net, dev) {
L
Linus Torvalds 已提交
4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021
		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;
			}
		}
4022
	}
L
Linus Torvalds 已提交
4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039

	/*
	 *	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.
 */
4040
void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4041
	__acquires(RCU)
L
Linus Torvalds 已提交
4042
{
4043
	struct net *net = seq_file_net(seq);
4044
	loff_t off;
L
Linus Torvalds 已提交
4045 4046
	struct net_device *dev;

4047
	rcu_read_lock();
4048 4049
	if (!*pos)
		return SEQ_START_TOKEN;
L
Linus Torvalds 已提交
4050

4051
	off = 1;
4052
	for_each_netdev_rcu(net, dev)
4053 4054
		if (off++ == *pos)
			return dev;
L
Linus Torvalds 已提交
4055

4056
	return NULL;
L
Linus Torvalds 已提交
4057 4058 4059 4060
}

void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
E
Eric Dumazet 已提交
4061 4062 4063 4064 4065 4066
	struct net_device *dev = v;

	if (v == SEQ_START_TOKEN)
		dev = first_net_device_rcu(seq_file_net(seq));
	else
		dev = next_net_device_rcu(dev);
4067

L
Linus Torvalds 已提交
4068
	++*pos;
E
Eric Dumazet 已提交
4069
	return dev;
L
Linus Torvalds 已提交
4070 4071 4072
}

void dev_seq_stop(struct seq_file *seq, void *v)
4073
	__releases(RCU)
L
Linus Torvalds 已提交
4074
{
4075
	rcu_read_unlock();
L
Linus Torvalds 已提交
4076 4077 4078 4079
}

static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
4080 4081
	struct rtnl_link_stats64 temp;
	const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
L
Linus Torvalds 已提交
4082

4083 4084
	seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
		   "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099
		   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
4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118
}

/*
 *	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
4119
static struct softnet_data *softnet_get_online(loff_t *pos)
L
Linus Torvalds 已提交
4120
{
C
Changli Gao 已提交
4121
	struct softnet_data *sd = NULL;
L
Linus Torvalds 已提交
4122

4123
	while (*pos < nr_cpu_ids)
4124
		if (cpu_online(*pos)) {
C
Changli Gao 已提交
4125
			sd = &per_cpu(softnet_data, *pos);
L
Linus Torvalds 已提交
4126 4127 4128
			break;
		} else
			++*pos;
C
Changli Gao 已提交
4129
	return sd;
L
Linus Torvalds 已提交
4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148
}

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
4149
	struct softnet_data *sd = v;
L
Linus Torvalds 已提交
4150

T
Tom Herbert 已提交
4151
	seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
C
Changli Gao 已提交
4152
		   sd->processed, sd->dropped, sd->time_squeeze, 0,
4153
		   0, 0, 0, 0, /* was fastroute */
C
Changli Gao 已提交
4154
		   sd->cpu_collision, sd->received_rps);
L
Linus Torvalds 已提交
4155 4156 4157
	return 0;
}

4158
static const struct seq_operations dev_seq_ops = {
L
Linus Torvalds 已提交
4159 4160 4161 4162 4163 4164 4165 4166
	.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)
{
4167 4168
	return seq_open_net(inode, file, &dev_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
4169 4170
}

4171
static const struct file_operations dev_seq_fops = {
L
Linus Torvalds 已提交
4172 4173 4174 4175
	.owner	 = THIS_MODULE,
	.open    = dev_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
4176
	.release = seq_release_net,
L
Linus Torvalds 已提交
4177 4178
};

4179
static const struct seq_operations softnet_seq_ops = {
L
Linus Torvalds 已提交
4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190
	.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);
}

4191
static const struct file_operations softnet_seq_fops = {
L
Linus Torvalds 已提交
4192 4193 4194 4195 4196 4197 4198
	.owner	 = THIS_MODULE,
	.open    = softnet_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release,
};

4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210
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;
	}

4211
	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4212 4213 4214 4215 4216 4217 4218 4219 4220 4221
		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)
4222
	__acquires(RCU)
4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245
{
	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
4246
		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4247 4248

	while (nxt == &ptype_base[hash]) {
4249
		if (++hash >= PTYPE_HASH_SIZE)
4250 4251 4252 4253 4254 4255 4256 4257
			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)
4258
	__releases(RCU)
4259 4260 4261 4262 4263 4264 4265 4266 4267 4268
{
	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");
4269
	else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4270 4271 4272 4273 4274
		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
4275 4276
		seq_printf(seq, " %-8s %pF\n",
			   pt->dev ? pt->dev->name : "", pt->func);
4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290
	}

	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)
{
4291 4292
	return seq_open_net(inode, file, &ptype_seq_ops,
			sizeof(struct seq_net_private));
4293 4294 4295 4296 4297 4298 4299
}

static const struct file_operations ptype_seq_fops = {
	.owner	 = THIS_MODULE,
	.open    = ptype_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
4300
	.release = seq_release_net,
4301 4302 4303
};


4304
static int __net_init dev_proc_net_init(struct net *net)
L
Linus Torvalds 已提交
4305 4306 4307
{
	int rc = -ENOMEM;

4308
	if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
L
Linus Torvalds 已提交
4309
		goto out;
4310
	if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
L
Linus Torvalds 已提交
4311
		goto out_dev;
4312
	if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4313
		goto out_softnet;
4314

4315
	if (wext_proc_init(net))
4316
		goto out_ptype;
L
Linus Torvalds 已提交
4317 4318 4319
	rc = 0;
out:
	return rc;
4320
out_ptype:
4321
	proc_net_remove(net, "ptype");
L
Linus Torvalds 已提交
4322
out_softnet:
4323
	proc_net_remove(net, "softnet_stat");
L
Linus Torvalds 已提交
4324
out_dev:
4325
	proc_net_remove(net, "dev");
L
Linus Torvalds 已提交
4326 4327
	goto out;
}
4328

4329
static void __net_exit dev_proc_net_exit(struct net *net)
4330 4331 4332 4333 4334 4335 4336 4337
{
	wext_proc_exit(net);

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

4338
static struct pernet_operations __net_initdata dev_proc_ops = {
4339 4340 4341 4342 4343 4344 4345 4346
	.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
4347 4348 4349 4350 4351 4352
#else
#define dev_proc_init() 0
#endif	/* CONFIG_PROC_FS */


/**
J
Jiri Pirko 已提交
4353
 *	netdev_set_master	-	set up master pointer
L
Linus Torvalds 已提交
4354 4355 4356 4357 4358 4359
 *	@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
J
Jiri Pirko 已提交
4360
 *	are adjusted and the function returns zero.
L
Linus Torvalds 已提交
4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374
 */
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;
4375

E
Eric Dumazet 已提交
4376 4377
	if (old) {
		synchronize_net();
L
Linus Torvalds 已提交
4378
		dev_put(old);
E
Eric Dumazet 已提交
4379
	}
J
Jiri Pirko 已提交
4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402
	return 0;
}
EXPORT_SYMBOL(netdev_set_master);

/**
 *	netdev_set_bond_master	-	set up bonding 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 %RTM_NEWLINK is sent
 *	to the routing socket and the function returns zero.
 */
int netdev_set_bond_master(struct net_device *slave, struct net_device *master)
{
	int err;

	ASSERT_RTNL();

	err = netdev_set_master(slave, master);
	if (err)
		return err;
L
Linus Torvalds 已提交
4403 4404 4405 4406 4407 4408 4409 4410
	if (master)
		slave->flags |= IFF_SLAVE;
	else
		slave->flags &= ~IFF_SLAVE;

	rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
	return 0;
}
J
Jiri Pirko 已提交
4411
EXPORT_SYMBOL(netdev_set_bond_master);
L
Linus Torvalds 已提交
4412

4413 4414
static void dev_change_rx_flags(struct net_device *dev, int flags)
{
4415 4416 4417 4418
	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);
4419 4420
}

4421
static int __dev_set_promiscuity(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
4422 4423
{
	unsigned short old_flags = dev->flags;
4424 4425
	uid_t uid;
	gid_t gid;
L
Linus Torvalds 已提交
4426

4427 4428
	ASSERT_RTNL();

4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445
	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;
		}
	}
4446
	if (dev->flags != old_flags) {
L
Linus Torvalds 已提交
4447 4448
		printk(KERN_INFO "device %s %s promiscuous mode\n",
		       dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4449
							       "left");
4450 4451
		if (audit_enabled) {
			current_uid_gid(&uid, &gid);
4452 4453 4454 4455 4456 4457
			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),
4458
				uid, gid,
4459
				audit_get_sessionid(current));
4460
		}
4461

4462
		dev_change_rx_flags(dev, IFF_PROMISC);
L
Linus Torvalds 已提交
4463
	}
4464
	return 0;
L
Linus Torvalds 已提交
4465 4466
}

4467 4468 4469 4470 4471 4472 4473 4474 4475
/**
 *	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.
4476
 *	Return 0 if successful or a negative errno code on error.
4477
 */
4478
int dev_set_promiscuity(struct net_device *dev, int inc)
4479 4480
{
	unsigned short old_flags = dev->flags;
4481
	int err;
4482

4483
	err = __dev_set_promiscuity(dev, inc);
4484
	if (err < 0)
4485
		return err;
4486 4487
	if (dev->flags != old_flags)
		dev_set_rx_mode(dev);
4488
	return err;
4489
}
E
Eric Dumazet 已提交
4490
EXPORT_SYMBOL(dev_set_promiscuity);
4491

L
Linus Torvalds 已提交
4492 4493 4494 4495 4496 4497 4498 4499 4500 4501
/**
 *	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.
4502
 *	Return 0 if successful or a negative errno code on error.
L
Linus Torvalds 已提交
4503 4504
 */

4505
int dev_set_allmulti(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
4506 4507 4508
{
	unsigned short old_flags = dev->flags;

4509 4510
	ASSERT_RTNL();

L
Linus Torvalds 已提交
4511
	dev->flags |= IFF_ALLMULTI;
4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526 4527
	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;
		}
	}
4528
	if (dev->flags ^ old_flags) {
4529
		dev_change_rx_flags(dev, IFF_ALLMULTI);
4530
		dev_set_rx_mode(dev);
4531
	}
4532
	return 0;
4533
}
E
Eric Dumazet 已提交
4534
EXPORT_SYMBOL(dev_set_allmulti);
4535 4536 4537 4538

/*
 *	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
4539
 *	filtering it is put in promiscuous mode while unicast addresses
4540 4541 4542 4543
 *	are present.
 */
void __dev_set_rx_mode(struct net_device *dev)
{
4544 4545
	const struct net_device_ops *ops = dev->netdev_ops;

4546 4547 4548 4549 4550
	/* dev_open will call this function so the list will stay sane. */
	if (!(dev->flags&IFF_UP))
		return;

	if (!netif_device_present(dev))
4551
		return;
4552

4553 4554
	if (ops->ndo_set_rx_mode)
		ops->ndo_set_rx_mode(dev);
4555 4556 4557 4558
	else {
		/* Unicast addresses changes may only happen under the rtnl,
		 * therefore calling __dev_set_promiscuity here is safe.
		 */
4559
		if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4560 4561
			__dev_set_promiscuity(dev, 1);
			dev->uc_promisc = 1;
4562
		} else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4563 4564 4565 4566
			__dev_set_promiscuity(dev, -1);
			dev->uc_promisc = 0;
		}

4567 4568
		if (ops->ndo_set_multicast_list)
			ops->ndo_set_multicast_list(dev);
4569 4570 4571 4572 4573
	}
}

void dev_set_rx_mode(struct net_device *dev)
{
4574
	netif_addr_lock_bh(dev);
4575
	__dev_set_rx_mode(dev);
4576
	netif_addr_unlock_bh(dev);
L
Linus Torvalds 已提交
4577 4578
}

4579 4580 4581 4582 4583 4584
/**
 *	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
4585 4586 4587 4588 4589 4590
unsigned dev_get_flags(const struct net_device *dev)
{
	unsigned flags;

	flags = (dev->flags & ~(IFF_PROMISC |
				IFF_ALLMULTI |
S
Stefan Rompf 已提交
4591 4592 4593
				IFF_RUNNING |
				IFF_LOWER_UP |
				IFF_DORMANT)) |
L
Linus Torvalds 已提交
4594 4595 4596
		(dev->gflags & (IFF_PROMISC |
				IFF_ALLMULTI));

S
Stefan Rompf 已提交
4597 4598 4599 4600 4601 4602 4603 4604
	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
4605 4606 4607

	return flags;
}
E
Eric Dumazet 已提交
4608
EXPORT_SYMBOL(dev_get_flags);
L
Linus Torvalds 已提交
4609

4610
int __dev_change_flags(struct net_device *dev, unsigned int flags)
L
Linus Torvalds 已提交
4611 4612
{
	int old_flags = dev->flags;
4613
	int ret;
L
Linus Torvalds 已提交
4614

4615 4616
	ASSERT_RTNL();

L
Linus Torvalds 已提交
4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630
	/*
	 *	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.
	 */

4631 4632
	if ((old_flags ^ flags) & IFF_MULTICAST)
		dev_change_rx_flags(dev, IFF_MULTICAST);
4633

4634
	dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
4635 4636 4637 4638 4639 4640 4641 4642 4643

	/*
	 *	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  ? */
4644
		ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
L
Linus Torvalds 已提交
4645 4646

		if (!ret)
4647
			dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
4648 4649 4650
	}

	if ((flags ^ dev->gflags) & IFF_PROMISC) {
E
Eric Dumazet 已提交
4651 4652
		int inc = (flags & IFF_PROMISC) ? 1 : -1;

L
Linus Torvalds 已提交
4653 4654 4655 4656 4657 4658 4659 4660 4661
		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
4662 4663
		int inc = (flags & IFF_ALLMULTI) ? 1 : -1;

L
Linus Torvalds 已提交
4664 4665 4666 4667
		dev->gflags ^= IFF_ALLMULTI;
		dev_set_allmulti(dev, inc);
	}

4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704
	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;
4705 4706
	if (changes)
		rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
L
Linus Torvalds 已提交
4707

4708
	__dev_notify_flags(dev, old_flags);
L
Linus Torvalds 已提交
4709 4710
	return ret;
}
E
Eric Dumazet 已提交
4711
EXPORT_SYMBOL(dev_change_flags);
L
Linus Torvalds 已提交
4712

4713 4714 4715 4716 4717 4718 4719
/**
 *	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
4720 4721
int dev_set_mtu(struct net_device *dev, int new_mtu)
{
4722
	const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735
	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;
4736 4737
	if (ops->ndo_change_mtu)
		err = ops->ndo_change_mtu(dev, new_mtu);
L
Linus Torvalds 已提交
4738 4739
	else
		dev->mtu = new_mtu;
4740

L
Linus Torvalds 已提交
4741
	if (!err && dev->flags & IFF_UP)
4742
		call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
L
Linus Torvalds 已提交
4743 4744
	return err;
}
E
Eric Dumazet 已提交
4745
EXPORT_SYMBOL(dev_set_mtu);
L
Linus Torvalds 已提交
4746

4747 4748 4749 4750 4751 4752 4753 4754 4755 4756 4757
/**
 *	dev_set_group - Change group this device belongs to
 *	@dev: device
 *	@new_group: group this device should belong to
 */
void dev_set_group(struct net_device *dev, int new_group)
{
	dev->group = new_group;
}
EXPORT_SYMBOL(dev_set_group);

4758 4759 4760 4761 4762 4763 4764
/**
 *	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
4765 4766
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
{
4767
	const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
4768 4769
	int err;

4770
	if (!ops->ndo_set_mac_address)
L
Linus Torvalds 已提交
4771 4772 4773 4774 4775
		return -EOPNOTSUPP;
	if (sa->sa_family != dev->type)
		return -EINVAL;
	if (!netif_device_present(dev))
		return -ENODEV;
4776
	err = ops->ndo_set_mac_address(dev, sa);
L
Linus Torvalds 已提交
4777
	if (!err)
4778
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
L
Linus Torvalds 已提交
4779 4780
	return err;
}
E
Eric Dumazet 已提交
4781
EXPORT_SYMBOL(dev_set_mac_address);
L
Linus Torvalds 已提交
4782 4783

/*
E
Eric Dumazet 已提交
4784
 *	Perform the SIOCxIFxxx calls, inside rcu_read_lock()
L
Linus Torvalds 已提交
4785
 */
4786
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
L
Linus Torvalds 已提交
4787 4788
{
	int err;
E
Eric Dumazet 已提交
4789
	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
L
Linus Torvalds 已提交
4790 4791 4792 4793 4794

	if (!dev)
		return -ENODEV;

	switch (cmd) {
E
Eric Dumazet 已提交
4795 4796 4797
	case SIOCGIFFLAGS:	/* Get interface flags */
		ifr->ifr_flags = (short) dev_get_flags(dev);
		return 0;
L
Linus Torvalds 已提交
4798

E
Eric Dumazet 已提交
4799 4800 4801 4802
	case SIOCGIFMETRIC:	/* Get the metric on the interface
				   (currently unused) */
		ifr->ifr_metric = 0;
		return 0;
L
Linus Torvalds 已提交
4803

E
Eric Dumazet 已提交
4804 4805 4806
	case SIOCGIFMTU:	/* Get the MTU of a device */
		ifr->ifr_mtu = dev->mtu;
		return 0;
L
Linus Torvalds 已提交
4807

E
Eric Dumazet 已提交
4808 4809 4810 4811 4812 4813 4814 4815
	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
4816

E
Eric Dumazet 已提交
4817 4818 4819
	case SIOCGIFSLAVE:
		err = -EINVAL;
		break;
4820

E
Eric Dumazet 已提交
4821 4822 4823 4824 4825 4826 4827 4828
	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;
4829

E
Eric Dumazet 已提交
4830 4831 4832
	case SIOCGIFINDEX:
		ifr->ifr_ifindex = dev->ifindex;
		return 0;
4833

E
Eric Dumazet 已提交
4834 4835 4836
	case SIOCGIFTXQLEN:
		ifr->ifr_qlen = dev->tx_queue_len;
		return 0;
4837

E
Eric Dumazet 已提交
4838 4839 4840 4841 4842 4843 4844
	default:
		/* dev_ioctl() should ensure this case
		 * is never reached
		 */
		WARN_ON(1);
		err = -EINVAL;
		break;
4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856

	}
	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
4857
	const struct net_device_ops *ops;
4858 4859 4860 4861

	if (!dev)
		return -ENODEV;

J
Jarek Poplawski 已提交
4862 4863
	ops = dev->netdev_ops;

4864
	switch (cmd) {
E
Eric Dumazet 已提交
4865 4866
	case SIOCSIFFLAGS:	/* Set interface flags */
		return dev_change_flags(dev, ifr->ifr_flags);
4867

E
Eric Dumazet 已提交
4868 4869 4870
	case SIOCSIFMETRIC:	/* Set the metric on the interface
				   (currently unused) */
		return -EOPNOTSUPP;
4871

E
Eric Dumazet 已提交
4872 4873
	case SIOCSIFMTU:	/* Set the MTU of a device */
		return dev_set_mtu(dev, ifr->ifr_mtu);
L
Linus Torvalds 已提交
4874

E
Eric Dumazet 已提交
4875 4876
	case SIOCSIFHWADDR:
		return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
L
Linus Torvalds 已提交
4877

E
Eric Dumazet 已提交
4878 4879 4880 4881 4882 4883 4884
	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
4885

E
Eric Dumazet 已提交
4886 4887
	case SIOCSIFMAP:
		if (ops->ndo_set_config) {
L
Linus Torvalds 已提交
4888 4889
			if (!netif_device_present(dev))
				return -ENODEV;
E
Eric Dumazet 已提交
4890 4891 4892
			return ops->ndo_set_config(dev, &ifr->ifr_map);
		}
		return -EOPNOTSUPP;
L
Linus Torvalds 已提交
4893

E
Eric Dumazet 已提交
4894 4895 4896 4897 4898 4899
	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;
4900
		return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
E
Eric Dumazet 已提交
4901 4902 4903 4904 4905 4906 4907

	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;
4908
		return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
L
Linus Torvalds 已提交
4909

E
Eric Dumazet 已提交
4910 4911 4912 4913 4914
	case SIOCSIFTXQLEN:
		if (ifr->ifr_qlen < 0)
			return -EINVAL;
		dev->tx_queue_len = ifr->ifr_qlen;
		return 0;
L
Linus Torvalds 已提交
4915

E
Eric Dumazet 已提交
4916 4917 4918
	case SIOCSIFNAME:
		ifr->ifr_newname[IFNAMSIZ-1] = '\0';
		return dev_change_name(dev, ifr->ifr_newname);
L
Linus Torvalds 已提交
4919

E
Eric Dumazet 已提交
4920 4921 4922 4923 4924 4925 4926 4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947
	/*
	 *	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
4948 4949 4950 4951 4952 4953 4954 4955 4956 4957 4958 4959

	}
	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
4960
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
4961 4962 4963 4964 4965 4966 4967 4968 4969
 *	@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.
 */

4970
int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
L
Linus Torvalds 已提交
4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981
{
	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) {
4982
		rtnl_lock();
4983
		ret = dev_ifconf(net, (char __user *) arg);
4984
		rtnl_unlock();
L
Linus Torvalds 已提交
4985 4986 4987
		return ret;
	}
	if (cmd == SIOCGIFNAME)
4988
		return dev_ifname(net, (struct ifreq __user *)arg);
L
Linus Torvalds 已提交
4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003

	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
5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018
	/*
	 *	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
5019
		rcu_read_lock();
E
Eric Dumazet 已提交
5020
		ret = dev_ifsioc_locked(net, &ifr, cmd);
E
Eric Dumazet 已提交
5021
		rcu_read_unlock();
E
Eric Dumazet 已提交
5022 5023 5024 5025 5026 5027 5028 5029
		if (!ret) {
			if (colon)
				*colon = ':';
			if (copy_to_user(arg, &ifr,
					 sizeof(struct ifreq)))
				ret = -EFAULT;
		}
		return ret;
L
Linus Torvalds 已提交
5030

E
Eric Dumazet 已提交
5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043
	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
5044

E
Eric Dumazet 已提交
5045 5046 5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067
	/*
	 *	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
5068

E
Eric Dumazet 已提交
5069 5070 5071 5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119
	/*
	 *	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)) {
5120
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
5121
			rtnl_lock();
5122
			ret = dev_ifsioc(net, &ifr, cmd);
L
Linus Torvalds 已提交
5123
			rtnl_unlock();
E
Eric Dumazet 已提交
5124 5125 5126
			if (!ret && copy_to_user(arg, &ifr,
						 sizeof(struct ifreq)))
				ret = -EFAULT;
L
Linus Torvalds 已提交
5127
			return ret;
E
Eric Dumazet 已提交
5128 5129 5130 5131 5132
		}
		/* 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
5133 5134 5135 5136 5137 5138
	}
}


/**
 *	dev_new_index	-	allocate an ifindex
5139
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
5140 5141 5142 5143 5144
 *
 *	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.
 */
5145
static int dev_new_index(struct net *net)
L
Linus Torvalds 已提交
5146 5147 5148 5149 5150
{
	static int ifindex;
	for (;;) {
		if (++ifindex <= 0)
			ifindex = 1;
5151
		if (!__dev_get_by_index(net, ifindex))
L
Linus Torvalds 已提交
5152 5153 5154 5155 5156
			return ifindex;
	}
}

/* Delayed registration/unregisteration */
5157
static LIST_HEAD(net_todo_list);
L
Linus Torvalds 已提交
5158

5159
static void net_set_todo(struct net_device *dev)
L
Linus Torvalds 已提交
5160 5161 5162 5163
{
	list_add_tail(&dev->todo_list, &net_todo_list);
}

5164
static void rollback_registered_many(struct list_head *head)
5165
{
5166
	struct net_device *dev, *tmp;
5167

5168 5169 5170
	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

5171
	list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5172
		/* Some devices call without registering
5173 5174
		 * for initialization unwind. Remove those
		 * devices and proceed with the remaining.
5175 5176 5177 5178
		 */
		if (dev->reg_state == NETREG_UNINITIALIZED) {
			pr_debug("unregister_netdevice: device %s/%p never "
				 "was registered\n", dev->name, dev);
5179

5180
			WARN_ON(1);
5181 5182
			list_del(&dev->unreg_list);
			continue;
5183
		}
5184

5185
		BUG_ON(dev->reg_state != NETREG_REGISTERED);
5186
	}
5187

5188 5189
	/* If device is running, close it first. */
	dev_close_many(head);
5190

5191
	list_for_each_entry(dev, head, unreg_list) {
5192 5193
		/* And unlink it from device chain. */
		unlist_netdevice(dev);
5194

5195 5196
		dev->reg_state = NETREG_UNREGISTERING;
	}
5197 5198 5199

	synchronize_net();

5200 5201 5202
	list_for_each_entry(dev, head, unreg_list) {
		/* Shutdown queueing discipline. */
		dev_shutdown(dev);
5203 5204


5205 5206 5207 5208
		/* Notify protocols, that we are about to destroy
		   this device. They should clean all the things.
		*/
		call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5209

5210 5211 5212 5213
		if (!dev->rtnl_link_ops ||
		    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
			rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);

5214 5215 5216
		/*
		 *	Flush the unicast and multicast chains
		 */
5217
		dev_uc_flush(dev);
5218
		dev_mc_flush(dev);
5219

5220 5221
		if (dev->netdev_ops->ndo_uninit)
			dev->netdev_ops->ndo_uninit(dev);
5222

5223 5224
		/* Notifier chain MUST detach us from master device. */
		WARN_ON(dev->master);
5225

5226 5227 5228
		/* Remove entries from kobject tree */
		netdev_unregister_kobject(dev);
	}
5229

5230
	/* Process any work delayed until the end of the batch */
5231
	dev = list_first_entry(head, struct net_device, unreg_list);
5232
	call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5233

5234
	rcu_barrier();
5235

5236
	list_for_each_entry(dev, head, unreg_list)
5237 5238 5239 5240 5241 5242 5243 5244 5245
		dev_put(dev);
}

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

	list_add(&dev->unreg_list, &single);
	rollback_registered_many(&single);
5246 5247
}

5248
u32 netdev_fix_features(struct net_device *dev, u32 features)
5249
{
5250 5251 5252
	/* Fix illegal checksum combinations */
	if ((features & NETIF_F_HW_CSUM) &&
	    (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5253
		netdev_info(dev, "mixed HW and IP checksum settings.\n");
5254 5255 5256 5257 5258
		features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
	}

	if ((features & NETIF_F_NO_CSUM) &&
	    (features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5259
		netdev_info(dev, "mixed no checksumming and other settings.\n");
5260 5261 5262
		features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
	}

5263 5264 5265
	/* Fix illegal SG+CSUM combinations. */
	if ((features & NETIF_F_SG) &&
	    !(features & NETIF_F_ALL_CSUM)) {
5266 5267
		netdev_info(dev,
			    "Dropping NETIF_F_SG since no checksum feature.\n");
5268 5269 5270 5271 5272
		features &= ~NETIF_F_SG;
	}

	/* TSO requires that SG is present as well. */
	if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
5273
		netdev_info(dev, "Dropping NETIF_F_TSO since no SG feature.\n");
5274 5275 5276
		features &= ~NETIF_F_TSO;
	}

5277 5278 5279 5280 5281 5282
	/* Software GSO depends on SG. */
	if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
		netdev_info(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
		features &= ~NETIF_F_GSO;
	}

5283
	/* UFO needs SG and checksumming */
5284
	if (features & NETIF_F_UFO) {
5285 5286 5287 5288
		/* maybe split UFO into V4 and V6? */
		if (!((features & NETIF_F_GEN_CSUM) ||
		    (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))
			    == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5289 5290
			netdev_info(dev,
				"Dropping NETIF_F_UFO since no checksum offload features.\n");
5291 5292 5293 5294
			features &= ~NETIF_F_UFO;
		}

		if (!(features & NETIF_F_SG)) {
5295 5296
			netdev_info(dev,
				"Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5297 5298 5299 5300 5301 5302 5303 5304
			features &= ~NETIF_F_UFO;
		}
	}

	return features;
}
EXPORT_SYMBOL(netdev_fix_features);

5305 5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331
/**
 *	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);

T
Tom Herbert 已提交
5332
#ifdef CONFIG_RPS
5333 5334 5335
static int netif_alloc_rx_queues(struct net_device *dev)
{
	unsigned int i, count = dev->num_rx_queues;
T
Tom Herbert 已提交
5336
	struct netdev_rx_queue *rx;
5337

T
Tom Herbert 已提交
5338
	BUG_ON(count < 1);
5339

T
Tom Herbert 已提交
5340 5341 5342 5343
	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;
5344
	}
T
Tom Herbert 已提交
5345 5346 5347
	dev->_rx = rx;

	for (i = 0; i < count; i++)
T
Tom Herbert 已提交
5348
		rx[i].dev = dev;
5349 5350
	return 0;
}
T
Tom Herbert 已提交
5351
#endif
5352

C
Changli Gao 已提交
5353 5354 5355 5356 5357 5358 5359
static void netdev_init_one_queue(struct net_device *dev,
				  struct netdev_queue *queue, void *_unused)
{
	/* Initialize queue lock */
	spin_lock_init(&queue->_xmit_lock);
	netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
	queue->xmit_lock_owner = -1;
5360
	netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
C
Changli Gao 已提交
5361 5362 5363
	queue->dev = dev;
}

5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375 5376 5377
static int netif_alloc_netdev_queues(struct net_device *dev)
{
	unsigned int count = dev->num_tx_queues;
	struct netdev_queue *tx;

	BUG_ON(count < 1);

	tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL);
	if (!tx) {
		pr_err("netdev: Unable to allocate %u tx queues.\n",
		       count);
		return -ENOMEM;
	}
	dev->_tx = tx;
T
Tom Herbert 已提交
5378

5379 5380
	netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
	spin_lock_init(&dev->tx_global_lock);
C
Changli Gao 已提交
5381 5382

	return 0;
5383 5384
}

L
Linus Torvalds 已提交
5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396 5397 5398 5399 5400 5401 5402 5403 5404
/**
 *	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;
5405
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
5406 5407 5408 5409

	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

5410 5411
	might_sleep();

L
Linus Torvalds 已提交
5412 5413
	/* When net_device's are persistent, this will be fatal. */
	BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5414
	BUG_ON(!net);
L
Linus Torvalds 已提交
5415

5416
	spin_lock_init(&dev->addr_list_lock);
5417
	netdev_set_addr_lockdep_class(dev);
L
Linus Torvalds 已提交
5418 5419 5420 5421

	dev->iflink = -1;

	/* Init, if this function is available */
5422 5423
	if (dev->netdev_ops->ndo_init) {
		ret = dev->netdev_ops->ndo_init(dev);
L
Linus Torvalds 已提交
5424 5425 5426
		if (ret) {
			if (ret > 0)
				ret = -EIO;
5427
			goto out;
L
Linus Torvalds 已提交
5428 5429
		}
	}
5430

5431
	ret = dev_get_valid_name(dev, dev->name, 0);
5432
	if (ret)
5433
		goto err_uninit;
L
Linus Torvalds 已提交
5434

5435
	dev->ifindex = dev_new_index(net);
L
Linus Torvalds 已提交
5436 5437 5438
	if (dev->iflink == -1)
		dev->iflink = dev->ifindex;

5439 5440 5441
	/* Enable software offloads by default - will be stripped in
	 * netdev_fix_features() if not supported. */
	dev->features |= NETIF_F_SOFT_FEATURES;
L
Linus Torvalds 已提交
5442

5443 5444 5445 5446 5447
	/* Avoid warning from netdev_fix_features() for GSO without SG */
	if (!(dev->features & NETIF_F_SG))
		dev->features &= ~NETIF_F_GSO;

	dev->features = netdev_fix_features(dev, dev->features);
5448

5449 5450 5451
	/* 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.
5452
	 */
5453
	dev->vlan_features |= (NETIF_F_GRO | NETIF_F_HIGHDMA);
5454

5455 5456 5457 5458 5459
	ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		goto err_uninit;

5460
	ret = netdev_register_kobject(dev);
5461
	if (ret)
5462
		goto err_uninit;
5463 5464
	dev->reg_state = NETREG_REGISTERED;

L
Linus Torvalds 已提交
5465 5466 5467 5468 5469 5470 5471 5472 5473
	/*
	 *	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);
5474
	list_netdevice(dev);
L
Linus Torvalds 已提交
5475 5476

	/* Notify protocols, that a new device appeared. */
5477
	ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5478
	ret = notifier_to_errno(ret);
5479 5480 5481 5482
	if (ret) {
		rollback_registered(dev);
		dev->reg_state = NETREG_UNREGISTERED;
	}
5483 5484 5485 5486
	/*
	 *	Prevent userspace races by waiting until the network
	 *	device is fully setup before sending notifications.
	 */
5487 5488 5489
	if (!dev->rtnl_link_ops ||
	    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
		rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
L
Linus Torvalds 已提交
5490 5491 5492

out:
	return ret;
5493 5494

err_uninit:
5495 5496
	if (dev->netdev_ops->ndo_uninit)
		dev->netdev_ops->ndo_uninit(dev);
5497
	goto out;
L
Linus Torvalds 已提交
5498
}
E
Eric Dumazet 已提交
5499
EXPORT_SYMBOL(register_netdevice);
L
Linus Torvalds 已提交
5500

5501 5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512 5513 5514 5515 5516 5517 5518 5519 5520 5521 5522 5523 5524 5525 5526 5527 5528 5529 5530 5531
/**
 *	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;

	/* 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);

E
Eric Dumazet 已提交
5532 5533 5534 5535 5536
	/* Note : We dont allocate pcpu_refcnt for dummy devices,
	 * because users of this 'device' dont need to change
	 * its refcount.
	 */

5537 5538 5539 5540 5541
	return 0;
}
EXPORT_SYMBOL_GPL(init_dummy_netdev);


L
Linus Torvalds 已提交
5542 5543 5544 5545 5546 5547 5548 5549 5550
/**
 *	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.
 *
5551
 *	This is a wrapper around register_netdevice that takes the rtnl semaphore
L
Linus Torvalds 已提交
5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569
 *	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;
	}
5570

L
Linus Torvalds 已提交
5571 5572 5573 5574 5575 5576 5577
	err = register_netdevice(dev);
out:
	rtnl_unlock();
	return err;
}
EXPORT_SYMBOL(register_netdev);

E
Eric Dumazet 已提交
5578 5579 5580 5581 5582 5583 5584 5585 5586 5587
int netdev_refcnt_read(const struct net_device *dev)
{
	int i, refcnt = 0;

	for_each_possible_cpu(i)
		refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
	return refcnt;
}
EXPORT_SYMBOL(netdev_refcnt_read);

L
Linus Torvalds 已提交
5588 5589 5590 5591 5592 5593 5594 5595 5596
/*
 * 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
5597
 * call dev_put.
L
Linus Torvalds 已提交
5598 5599 5600 5601
 */
static void netdev_wait_allrefs(struct net_device *dev)
{
	unsigned long rebroadcast_time, warning_time;
E
Eric Dumazet 已提交
5602
	int refcnt;
L
Linus Torvalds 已提交
5603

5604 5605
	linkwatch_forget_dev(dev);

L
Linus Torvalds 已提交
5606
	rebroadcast_time = warning_time = jiffies;
E
Eric Dumazet 已提交
5607 5608 5609
	refcnt = netdev_refcnt_read(dev);

	while (refcnt != 0) {
L
Linus Torvalds 已提交
5610
		if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5611
			rtnl_lock();
L
Linus Torvalds 已提交
5612 5613

			/* Rebroadcast unregister notification */
5614
			call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5615
			/* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5616
			 * should have already handle it the first time */
L
Linus Torvalds 已提交
5617 5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628

			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();
			}

5629
			__rtnl_unlock();
L
Linus Torvalds 已提交
5630 5631 5632 5633 5634 5635

			rebroadcast_time = jiffies;
		}

		msleep(250);

E
Eric Dumazet 已提交
5636 5637
		refcnt = netdev_refcnt_read(dev);

L
Linus Torvalds 已提交
5638 5639 5640 5641
		if (time_after(jiffies, warning_time + 10 * HZ)) {
			printk(KERN_EMERG "unregister_netdevice: "
			       "waiting for %s to become free. Usage "
			       "count = %d\n",
E
Eric Dumazet 已提交
5642
			       dev->name, refcnt);
L
Linus Torvalds 已提交
5643 5644 5645 5646 5647 5648 5649 5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661
			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
5662
 * We are invoked by rtnl_unlock().
L
Linus Torvalds 已提交
5663
 * This allows us to deal with problems:
5664
 * 1) We can delete sysfs objects which invoke hotplug
L
Linus Torvalds 已提交
5665 5666 5667
 *    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
5668 5669 5670
 *
 * 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
5671 5672 5673
 */
void netdev_run_todo(void)
{
5674
	struct list_head list;
L
Linus Torvalds 已提交
5675 5676

	/* Snapshot list, allow later requests */
5677
	list_replace_init(&net_todo_list, &list);
H
Herbert Xu 已提交
5678 5679

	__rtnl_unlock();
5680

L
Linus Torvalds 已提交
5681 5682
	while (!list_empty(&list)) {
		struct net_device *dev
5683
			= list_first_entry(&list, struct net_device, todo_list);
L
Linus Torvalds 已提交
5684 5685
		list_del(&dev->todo_list);

5686 5687 5688 5689 5690 5691
		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
5692

5693
		dev->reg_state = NETREG_UNREGISTERED;
L
Linus Torvalds 已提交
5694

5695
		on_each_cpu(flush_backlog, dev, 1);
5696

5697
		netdev_wait_allrefs(dev);
L
Linus Torvalds 已提交
5698

5699
		/* paranoia */
E
Eric Dumazet 已提交
5700
		BUG_ON(netdev_refcnt_read(dev));
E
Eric Dumazet 已提交
5701
		WARN_ON(rcu_dereference_raw(dev->ip_ptr));
E
Eric Dumazet 已提交
5702
		WARN_ON(rcu_dereference_raw(dev->ip6_ptr));
5703
		WARN_ON(dev->dn_ptr);
L
Linus Torvalds 已提交
5704

5705 5706
		if (dev->destructor)
			dev->destructor(dev);
5707 5708 5709

		/* Free network device */
		kobject_put(&dev->dev.kobj);
L
Linus Torvalds 已提交
5710 5711 5712
	}
}

5713 5714 5715 5716 5717 5718 5719 5720 5721 5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733
/* 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
}

5734 5735 5736
/**
 *	dev_get_stats	- get network device statistics
 *	@dev: device to get statistics from
5737
 *	@storage: place to store stats
5738
 *
5739 5740 5741 5742
 *	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.
5743
 */
5744 5745
struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
					struct rtnl_link_stats64 *storage)
5746
{
5747 5748
	const struct net_device_ops *ops = dev->netdev_ops;

5749 5750
	if (ops->ndo_get_stats64) {
		memset(storage, 0, sizeof(*storage));
5751 5752
		ops->ndo_get_stats64(dev, storage);
	} else if (ops->ndo_get_stats) {
5753
		netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5754 5755
	} else {
		netdev_stats_to_stats64(storage, &dev->stats);
5756
	}
5757
	storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5758
	return storage;
R
Rusty Russell 已提交
5759
}
5760
EXPORT_SYMBOL(dev_get_stats);
R
Rusty Russell 已提交
5761

5762
struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5763
{
5764
	struct netdev_queue *queue = dev_ingress_queue(dev);
5765

5766 5767 5768 5769 5770 5771 5772 5773 5774 5775 5776 5777
#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);
	queue->qdisc = &noop_qdisc;
	queue->qdisc_sleeping = &noop_qdisc;
	rcu_assign_pointer(dev->ingress_queue, queue);
#endif
	return queue;
5778 5779
}

L
Linus Torvalds 已提交
5780
/**
T
Tom Herbert 已提交
5781
 *	alloc_netdev_mqs - allocate network device
L
Linus Torvalds 已提交
5782 5783 5784
 *	@sizeof_priv:	size of private data to allocate space for
 *	@name:		device name format string
 *	@setup:		callback to initialize device
T
Tom Herbert 已提交
5785 5786
 *	@txqs:		the number of TX subqueues to allocate
 *	@rxqs:		the number of RX subqueues to allocate
L
Linus Torvalds 已提交
5787 5788
 *
 *	Allocates a struct net_device with private data area for driver use
5789
 *	and performs basic initialization.  Also allocates subquue structs
T
Tom Herbert 已提交
5790
 *	for each queue on the device.
L
Linus Torvalds 已提交
5791
 */
T
Tom Herbert 已提交
5792 5793 5794
struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
		void (*setup)(struct net_device *),
		unsigned int txqs, unsigned int rxqs)
L
Linus Torvalds 已提交
5795 5796
{
	struct net_device *dev;
5797
	size_t alloc_size;
5798
	struct net_device *p;
L
Linus Torvalds 已提交
5799

5800 5801
	BUG_ON(strlen(name) >= sizeof(dev->name));

T
Tom Herbert 已提交
5802
	if (txqs < 1) {
5803 5804 5805 5806 5807
		pr_err("alloc_netdev: Unable to allocate device "
		       "with zero queues.\n");
		return NULL;
	}

T
Tom Herbert 已提交
5808 5809 5810 5811 5812 5813 5814 5815
#ifdef CONFIG_RPS
	if (rxqs < 1) {
		pr_err("alloc_netdev: Unable to allocate device "
		       "with zero RX queues.\n");
		return NULL;
	}
#endif

5816
	alloc_size = sizeof(struct net_device);
5817 5818
	if (sizeof_priv) {
		/* ensure 32-byte alignment of private area */
5819
		alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5820 5821 5822
		alloc_size += sizeof_priv;
	}
	/* ensure 32-byte alignment of whole construct */
5823
	alloc_size += NETDEV_ALIGN - 1;
L
Linus Torvalds 已提交
5824

5825
	p = kzalloc(alloc_size, GFP_KERNEL);
L
Linus Torvalds 已提交
5826
	if (!p) {
5827
		printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
L
Linus Torvalds 已提交
5828 5829 5830
		return NULL;
	}

5831
	dev = PTR_ALIGN(p, NETDEV_ALIGN);
L
Linus Torvalds 已提交
5832
	dev->padded = (char *)dev - (char *)p;
5833

E
Eric Dumazet 已提交
5834 5835
	dev->pcpu_refcnt = alloc_percpu(int);
	if (!dev->pcpu_refcnt)
5836
		goto free_p;
5837 5838

	if (dev_addr_init(dev))
E
Eric Dumazet 已提交
5839
		goto free_pcpu;
5840

5841
	dev_mc_init(dev);
5842
	dev_uc_init(dev);
J
Jiri Pirko 已提交
5843

5844
	dev_net_set(dev, &init_net);
L
Linus Torvalds 已提交
5845

5846 5847 5848 5849 5850 5851 5852 5853 5854 5855
	dev->gso_max_size = GSO_MAX_SIZE;

	INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
	dev->ethtool_ntuple_list.count = 0;
	INIT_LIST_HEAD(&dev->napi_list);
	INIT_LIST_HEAD(&dev->unreg_list);
	INIT_LIST_HEAD(&dev->link_watch_list);
	dev->priv_flags = IFF_XMIT_DST_RELEASE;
	setup(dev);

T
Tom Herbert 已提交
5856 5857
	dev->num_tx_queues = txqs;
	dev->real_num_tx_queues = txqs;
5858
	if (netif_alloc_netdev_queues(dev))
5859
		goto free_all;
5860

E
Eric Dumazet 已提交
5861
#ifdef CONFIG_RPS
T
Tom Herbert 已提交
5862 5863
	dev->num_rx_queues = rxqs;
	dev->real_num_rx_queues = rxqs;
T
Tom Herbert 已提交
5864
	if (netif_alloc_rx_queues(dev))
5865
		goto free_all;
E
Eric Dumazet 已提交
5866
#endif
T
Tom Herbert 已提交
5867

L
Linus Torvalds 已提交
5868
	strcpy(dev->name, name);
5869
	dev->group = INIT_NETDEV_GROUP;
L
Linus Torvalds 已提交
5870
	return dev;
5871

5872 5873 5874 5875
free_all:
	free_netdev(dev);
	return NULL;

E
Eric Dumazet 已提交
5876 5877
free_pcpu:
	free_percpu(dev->pcpu_refcnt);
5878
	kfree(dev->_tx);
T
Tom Herbert 已提交
5879 5880 5881 5882
#ifdef CONFIG_RPS
	kfree(dev->_rx);
#endif

5883 5884 5885
free_p:
	kfree(p);
	return NULL;
L
Linus Torvalds 已提交
5886
}
T
Tom Herbert 已提交
5887
EXPORT_SYMBOL(alloc_netdev_mqs);
L
Linus Torvalds 已提交
5888 5889 5890 5891 5892

/**
 *	free_netdev - free network device
 *	@dev: device
 *
5893 5894
 *	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
5895 5896 5897 5898
 *	If this is the last reference then it will be freed.
 */
void free_netdev(struct net_device *dev)
{
5899 5900
	struct napi_struct *p, *n;

5901 5902
	release_net(dev_net(dev));

5903
	kfree(dev->_tx);
T
Tom Herbert 已提交
5904 5905 5906
#ifdef CONFIG_RPS
	kfree(dev->_rx);
#endif
5907

5908 5909
	kfree(rcu_dereference_raw(dev->ingress_queue));

5910 5911 5912
	/* Flush device addresses */
	dev_addr_flush(dev);

5913 5914 5915
	/* Clear ethtool n-tuple list */
	ethtool_ntuple_flush(dev);

5916 5917 5918
	list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
		netif_napi_del(p);

E
Eric Dumazet 已提交
5919 5920 5921
	free_percpu(dev->pcpu_refcnt);
	dev->pcpu_refcnt = NULL;

S
Stephen Hemminger 已提交
5922
	/*  Compatibility with error handling in drivers */
L
Linus Torvalds 已提交
5923 5924 5925 5926 5927 5928 5929 5930
	if (dev->reg_state == NETREG_UNINITIALIZED) {
		kfree((char *)dev - dev->padded);
		return;
	}

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

5931 5932
	/* will free via device release */
	put_device(&dev->dev);
L
Linus Torvalds 已提交
5933
}
E
Eric Dumazet 已提交
5934
EXPORT_SYMBOL(free_netdev);
5935

5936 5937 5938 5939 5940 5941
/**
 *	synchronize_net -  Synchronize with packet receive processing
 *
 *	Wait for packets currently being received to be done.
 *	Does not block later packets from starting.
 */
5942
void synchronize_net(void)
L
Linus Torvalds 已提交
5943 5944
{
	might_sleep();
5945
	synchronize_rcu();
L
Linus Torvalds 已提交
5946
}
E
Eric Dumazet 已提交
5947
EXPORT_SYMBOL(synchronize_net);
L
Linus Torvalds 已提交
5948 5949

/**
5950
 *	unregister_netdevice_queue - remove device from the kernel
L
Linus Torvalds 已提交
5951
 *	@dev: device
5952
 *	@head: list
5953
 *
L
Linus Torvalds 已提交
5954
 *	This function shuts down a device interface and removes it
5955
 *	from the kernel tables.
5956
 *	If head not NULL, device is queued to be unregistered later.
L
Linus Torvalds 已提交
5957 5958 5959 5960 5961
 *
 *	Callers must hold the rtnl semaphore.  You may want
 *	unregister_netdev() instead of this.
 */

5962
void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
L
Linus Torvalds 已提交
5963
{
5964 5965
	ASSERT_RTNL();

5966
	if (head) {
5967
		list_move_tail(&dev->unreg_list, head);
5968 5969 5970 5971 5972
	} else {
		rollback_registered(dev);
		/* Finish processing unregister after unlock */
		net_set_todo(dev);
	}
L
Linus Torvalds 已提交
5973
}
5974
EXPORT_SYMBOL(unregister_netdevice_queue);
L
Linus Torvalds 已提交
5975

5976 5977 5978 5979 5980 5981 5982 5983 5984 5985 5986 5987 5988 5989
/**
 *	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);
	}
}
5990
EXPORT_SYMBOL(unregister_netdevice_many);
5991

L
Linus Torvalds 已提交
5992 5993 5994 5995 5996
/**
 *	unregister_netdev - remove device from the kernel
 *	@dev: device
 *
 *	This function shuts down a device interface and removes it
5997
 *	from the kernel tables.
L
Linus Torvalds 已提交
5998 5999 6000 6001 6002 6003 6004 6005 6006 6007 6008 6009 6010
 *
 *	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);

6011 6012 6013 6014 6015 6016 6017 6018 6019 6020 6021 6022 6023 6024 6025 6026 6027 6028 6029 6030 6031 6032 6033 6034 6035 6036 6037 6038 6039 6040 6041 6042
/**
 *	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;
6043
	if (net_eq(dev_net(dev), net))
6044 6045 6046 6047 6048 6049
		goto out;

	/* Pick the destination device name, and ensure
	 * we can use it in the destination network namespace.
	 */
	err = -EEXIST;
6050
	if (__dev_get_by_name(net, dev->name)) {
6051 6052 6053
		/* We get here if we can't use the current device name */
		if (!pat)
			goto out;
6054
		if (dev_get_valid_name(dev, pat, 1))
6055 6056 6057 6058 6059 6060 6061 6062
			goto out;
	}

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

	/* If device is running close it first. */
6063
	dev_close(dev);
6064 6065 6066 6067 6068 6069 6070 6071 6072 6073 6074 6075

	/* 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.
6076 6077 6078 6079

	   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.
6080 6081
	*/
	call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6082
	call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
6083 6084 6085 6086

	/*
	 *	Flush the unicast and multicast chains
	 */
6087
	dev_uc_flush(dev);
6088
	dev_mc_flush(dev);
6089 6090

	/* Actually switch the network namespace */
6091
	dev_net_set(dev, net);
6092 6093 6094 6095 6096 6097 6098 6099 6100

	/* 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;
	}

6101
	/* Fixup kobjects */
6102
	err = device_rename(&dev->dev, dev->name);
6103
	WARN_ON(err);
6104 6105 6106 6107 6108 6109 6110

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

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

6111 6112 6113 6114 6115 6116
	/*
	 *	Prevent userspace races by waiting until the network
	 *	device is fully setup before sending notifications.
	 */
	rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);

6117 6118 6119 6120 6121
	synchronize_net();
	err = 0;
out:
	return err;
}
6122
EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6123

L
Linus Torvalds 已提交
6124 6125 6126 6127 6128 6129 6130 6131 6132
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;

6133
	if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
L
Linus Torvalds 已提交
6134 6135 6136 6137 6138 6139 6140 6141 6142 6143 6144 6145 6146 6147 6148 6149
		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. */
6150 6151 6152 6153 6154 6155
	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
6156 6157 6158 6159 6160

	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	local_irq_enable();

	/* Process offline CPU's input_pkt_queue */
6161
	while ((skb = __skb_dequeue(&oldsd->process_queue))) {
L
Linus Torvalds 已提交
6162
		netif_rx(skb);
6163
		input_queue_head_incr(oldsd);
T
Tom Herbert 已提交
6164
	}
6165
	while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6166
		netif_rx(skb);
6167 6168
		input_queue_head_incr(oldsd);
	}
L
Linus Torvalds 已提交
6169 6170 6171 6172 6173

	return NOTIFY_OK;
}


6174
/**
6175 6176 6177 6178
 *	netdev_increment_features - increment feature set by one
 *	@all: current feature set
 *	@one: new feature set
 *	@mask: mask feature set
6179 6180
 *
 *	Computes a new feature set after adding a device with feature set
6181 6182
 *	@one to the master device with current feature set @all.  Will not
 *	enable anything that is off in @mask. Returns the new feature set.
6183
 */
6184
u32 netdev_increment_features(u32 all, u32 one, u32 mask)
6185 6186
{
	/* If device needs checksumming, downgrade to it. */
E
Eric Dumazet 已提交
6187
	if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
6188 6189 6190 6191 6192 6193 6194 6195
		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);
		}
6196

6197 6198 6199 6200 6201 6202
		/* 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;
		}
	}
6203

6204
	one |= NETIF_F_ALL_CSUM;
6205

6206
	one |= all & NETIF_F_ONE_FOR_ALL;
6207
	all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
6208
	all |= one & mask & NETIF_F_ONE_FOR_ALL;
6209 6210 6211

	return all;
}
6212
EXPORT_SYMBOL(netdev_increment_features);
6213

6214 6215 6216 6217 6218 6219 6220 6221 6222 6223 6224 6225 6226
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;
}

6227
/* Initialize per network namespace state */
6228
static int __net_init netdev_init(struct net *net)
6229 6230 6231
{
	INIT_LIST_HEAD(&net->dev_base_head);

6232 6233 6234
	net->dev_name_head = netdev_create_hash();
	if (net->dev_name_head == NULL)
		goto err_name;
6235

6236 6237 6238
	net->dev_index_head = netdev_create_hash();
	if (net->dev_index_head == NULL)
		goto err_idx;
6239 6240

	return 0;
6241 6242 6243 6244 6245

err_idx:
	kfree(net->dev_name_head);
err_name:
	return -ENOMEM;
6246 6247
}

6248 6249 6250 6251 6252 6253 6254 6255
/**
 *	netdev_drivername - network driver for the device
 *	@dev: network device
 *	@buffer: buffer for resulting name
 *	@len: size of buffer
 *
 *	Determine network driver for device.
 */
6256
char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
6257
{
6258 6259
	const struct device_driver *driver;
	const struct device *parent;
6260 6261 6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273 6274 6275

	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;
}

6276 6277 6278 6279 6280 6281 6282 6283 6284 6285 6286 6287 6288 6289 6290 6291 6292 6293 6294 6295 6296 6297 6298 6299 6300 6301 6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329 6330 6331 6332 6333 6334 6335 6336 6337
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);

6338
static void __net_exit netdev_exit(struct net *net)
6339 6340 6341 6342 6343
{
	kfree(net->dev_name_head);
	kfree(net->dev_index_head);
}

6344
static struct pernet_operations __net_initdata netdev_net_ops = {
6345 6346 6347 6348
	.init = netdev_init,
	.exit = netdev_exit,
};

6349
static void __net_exit default_device_exit(struct net *net)
6350
{
6351
	struct net_device *dev, *aux;
6352
	/*
6353
	 * Push all migratable network devices back to the
6354 6355 6356
	 * initial network namespace
	 */
	rtnl_lock();
6357
	for_each_netdev_safe(net, dev, aux) {
6358
		int err;
6359
		char fb_name[IFNAMSIZ];
6360 6361 6362 6363 6364

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

6365 6366 6367
		/* Leave virtual devices for the generic cleanup */
		if (dev->rtnl_link_ops)
			continue;
6368

6369
		/* Push remaing network devices to init_net */
6370 6371
		snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
		err = dev_change_net_namespace(dev, &init_net, fb_name);
6372
		if (err) {
6373
			printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6374
				__func__, dev->name, err);
6375
			BUG();
6376 6377 6378 6379 6380
		}
	}
	rtnl_unlock();
}

6381 6382 6383
static void __net_exit default_device_exit_batch(struct list_head *net_list)
{
	/* At exit all network devices most be removed from a network
6384
	 * namespace.  Do this in the reverse order of registration.
6385 6386 6387 6388 6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399 6400 6401 6402 6403 6404
	 * 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();
}

6405
static struct pernet_operations __net_initdata default_device_ops = {
6406
	.exit = default_device_exit,
6407
	.exit_batch = default_device_exit_batch,
6408 6409
};

L
Linus Torvalds 已提交
6410 6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429
/*
 *	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;

6430
	if (netdev_kobject_init())
L
Linus Torvalds 已提交
6431 6432 6433
		goto out;

	INIT_LIST_HEAD(&ptype_all);
6434
	for (i = 0; i < PTYPE_HASH_SIZE; i++)
L
Linus Torvalds 已提交
6435 6436
		INIT_LIST_HEAD(&ptype_base[i]);

6437 6438
	if (register_pernet_subsys(&netdev_net_ops))
		goto out;
L
Linus Torvalds 已提交
6439 6440 6441 6442 6443

	/*
	 *	Initialise the packet receive queues.
	 */

6444
	for_each_possible_cpu(i) {
E
Eric Dumazet 已提交
6445
		struct softnet_data *sd = &per_cpu(softnet_data, i);
L
Linus Torvalds 已提交
6446

C
Changli Gao 已提交
6447
		memset(sd, 0, sizeof(*sd));
E
Eric Dumazet 已提交
6448
		skb_queue_head_init(&sd->input_pkt_queue);
6449
		skb_queue_head_init(&sd->process_queue);
E
Eric Dumazet 已提交
6450 6451
		sd->completion_queue = NULL;
		INIT_LIST_HEAD(&sd->poll_list);
6452 6453
		sd->output_queue = NULL;
		sd->output_queue_tailp = &sd->output_queue;
E
Eric Dumazet 已提交
6454
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
6455 6456 6457 6458
		sd->csd.func = rps_trigger_softirq;
		sd->csd.info = sd;
		sd->csd.flags = 0;
		sd->cpu = i;
6459
#endif
T
Tom Herbert 已提交
6460

E
Eric Dumazet 已提交
6461 6462 6463 6464
		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
6465 6466 6467 6468
	}

	dev_boot_phase = 0;

6469 6470 6471 6472 6473 6474 6475 6476 6477 6478 6479 6480 6481 6482 6483
	/* 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;

6484 6485
	open_softirq(NET_TX_SOFTIRQ, net_tx_action);
	open_softirq(NET_RX_SOFTIRQ, net_rx_action);
L
Linus Torvalds 已提交
6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496

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

subsys_initcall(net_dev_init);

6497 6498
static int __init initialize_hashrnd(void)
{
T
Tom Herbert 已提交
6499
	get_random_bytes(&hashrnd, sizeof(hashrnd));
6500 6501 6502 6503 6504
	return 0;
}

late_initcall_sync(initialize_hashrnd);