dev.c 160.1 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 <linux/net_tstamp.h>
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#include <linux/jump_label.h>
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#include <net/flow_keys.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 void dev_base_seq_inc(struct net *net)
{
	while (++net->dev_base_seq == 0);
}

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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);
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	dev_base_seq_inc(net);

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	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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	dev_base_seq_inc(dev_net(dev));
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}

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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;
}
E
Eric Dumazet 已提交
537
EXPORT_SYMBOL(netdev_boot_setup_check);
L
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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
	 */
562
	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
608
 *	@net: the applicable net namespace
L
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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.
 */

618
struct net_device *__dev_get_by_name(struct net *net, const char *name)
L
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619 620
{
	struct hlist_node *p;
E
Eric Dumazet 已提交
621 622
	struct net_device *dev;
	struct hlist_head *head = dev_name_hash(net, name);
L
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623

E
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624
	hlist_for_each_entry(dev, p, head, name_hlist)
L
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625 626
		if (!strncmp(dev->name, name, IFNAMSIZ))
			return dev;
E
Eric Dumazet 已提交
627

L
Linus Torvalds 已提交
628 629
	return NULL;
}
E
Eric Dumazet 已提交
630
EXPORT_SYMBOL(__dev_get_by_name);
L
Linus Torvalds 已提交
631

632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657
/**
 *	dev_get_by_name_rcu	- find a device by its name
 *	@net: the applicable net namespace
 *	@name: name to find
 *
 *	Find an interface by name.
 *	If the name is found a pointer to the device is returned.
 * 	If the name is not found then %NULL is returned.
 *	The reference counters are not incremented so the caller must be
 *	careful with locks. The caller must hold RCU lock.
 */

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

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

	return NULL;
}
EXPORT_SYMBOL(dev_get_by_name_rcu);

L
Linus Torvalds 已提交
658 659
/**
 *	dev_get_by_name		- find a device by its name
660
 *	@net: the applicable net namespace
L
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661 662 663 664 665 666 667 668 669
 *	@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.
 */

670
struct net_device *dev_get_by_name(struct net *net, const char *name)
L
Linus Torvalds 已提交
671 672 673
{
	struct net_device *dev;

674 675
	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
L
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	if (dev)
		dev_hold(dev);
678
	rcu_read_unlock();
L
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679 680
	return dev;
}
E
Eric Dumazet 已提交
681
EXPORT_SYMBOL(dev_get_by_name);
L
Linus Torvalds 已提交
682 683 684

/**
 *	__dev_get_by_index - find a device by its ifindex
685
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
686 687 688 689 690 691 692 693 694
 *	@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.
 */

695
struct net_device *__dev_get_by_index(struct net *net, int ifindex)
L
Linus Torvalds 已提交
696 697
{
	struct hlist_node *p;
E
Eric Dumazet 已提交
698 699
	struct net_device *dev;
	struct hlist_head *head = dev_index_hash(net, ifindex);
L
Linus Torvalds 已提交
700

E
Eric Dumazet 已提交
701
	hlist_for_each_entry(dev, p, head, index_hlist)
L
Linus Torvalds 已提交
702 703
		if (dev->ifindex == ifindex)
			return dev;
E
Eric Dumazet 已提交
704

L
Linus Torvalds 已提交
705 706
	return NULL;
}
E
Eric Dumazet 已提交
707
EXPORT_SYMBOL(__dev_get_by_index);
L
Linus Torvalds 已提交
708

709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733
/**
 *	dev_get_by_index_rcu - find a device by its ifindex
 *	@net: the applicable net namespace
 *	@ifindex: index of device
 *
 *	Search for an interface by index. Returns %NULL if the device
 *	is not found or a pointer to the device. The device has not
 *	had its reference counter increased so the caller must be careful
 *	about locking. The caller must hold RCU lock.
 */

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

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

	return NULL;
}
EXPORT_SYMBOL(dev_get_by_index_rcu);

L
Linus Torvalds 已提交
734 735 736

/**
 *	dev_get_by_index - find a device by its ifindex
737
 *	@net: the applicable net namespace
L
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738 739 740 741 742 743 744 745
 *	@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.
 */

746
struct net_device *dev_get_by_index(struct net *net, int ifindex)
L
Linus Torvalds 已提交
747 748 749
{
	struct net_device *dev;

750 751
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifindex);
L
Linus Torvalds 已提交
752 753
	if (dev)
		dev_hold(dev);
754
	rcu_read_unlock();
L
Linus Torvalds 已提交
755 756
	return dev;
}
E
Eric Dumazet 已提交
757
EXPORT_SYMBOL(dev_get_by_index);
L
Linus Torvalds 已提交
758 759

/**
760
 *	dev_getbyhwaddr_rcu - find a device by its hardware address
761
 *	@net: the applicable net namespace
L
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762 763 764 765
 *	@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
766 767
 *	is not found or a pointer to the device.
 *	The caller must hold RCU or RTNL.
768
 *	The returned device has not had its ref count increased
L
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769 770 771 772
 *	and the caller must therefore be careful about locking
 *
 */

773 774
struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
				       const char *ha)
L
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775 776 777
{
	struct net_device *dev;

778
	for_each_netdev_rcu(net, dev)
L
Linus Torvalds 已提交
779 780
		if (dev->type == type &&
		    !memcmp(dev->dev_addr, ha, dev->addr_len))
781 782 783
			return dev;

	return NULL;
L
Linus Torvalds 已提交
784
}
785
EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
786

787
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
L
Linus Torvalds 已提交
788 789 790
{
	struct net_device *dev;

791
	ASSERT_RTNL();
792
	for_each_netdev(net, dev)
793
		if (dev->type == type)
794 795 796
			return dev;

	return NULL;
797 798 799
}
EXPORT_SYMBOL(__dev_getfirstbyhwtype);

800
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
801
{
802
	struct net_device *dev, *ret = NULL;
803

804 805 806 807 808 809 810 811 812
	rcu_read_lock();
	for_each_netdev_rcu(net, dev)
		if (dev->type == type) {
			dev_hold(dev);
			ret = dev;
			break;
		}
	rcu_read_unlock();
	return ret;
L
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813 814 815 816
}
EXPORT_SYMBOL(dev_getfirstbyhwtype);

/**
E
Eric Dumazet 已提交
817
 *	dev_get_by_flags_rcu - find any device with given flags
818
 *	@net: the applicable net namespace
L
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819 820 821 822
 *	@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
823 824
 *	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
825 826
 */

E
Eric Dumazet 已提交
827
struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
E
Eric Dumazet 已提交
828
				    unsigned short mask)
L
Linus Torvalds 已提交
829
{
830
	struct net_device *dev, *ret;
L
Linus Torvalds 已提交
831

832
	ret = NULL;
833
	for_each_netdev_rcu(net, dev) {
L
Linus Torvalds 已提交
834
		if (((dev->flags ^ if_flags) & mask) == 0) {
835
			ret = dev;
L
Linus Torvalds 已提交
836 837 838
			break;
		}
	}
839
	return ret;
L
Linus Torvalds 已提交
840
}
E
Eric Dumazet 已提交
841
EXPORT_SYMBOL(dev_get_by_flags_rcu);
L
Linus Torvalds 已提交
842 843 844 845 846 847

/**
 *	dev_valid_name - check if name is okay for network device
 *	@name: name string
 *
 *	Network device names need to be valid file names to
848 849
 *	to allow sysfs to work.  We also disallow any kind of
 *	whitespace.
L
Linus Torvalds 已提交
850
 */
851
int dev_valid_name(const char *name)
L
Linus Torvalds 已提交
852
{
853 854
	if (*name == '\0')
		return 0;
855 856
	if (strlen(name) >= IFNAMSIZ)
		return 0;
857 858 859 860 861 862 863 864 865
	if (!strcmp(name, ".") || !strcmp(name, ".."))
		return 0;

	while (*name) {
		if (*name == '/' || isspace(*name))
			return 0;
		name++;
	}
	return 1;
L
Linus Torvalds 已提交
866
}
E
Eric Dumazet 已提交
867
EXPORT_SYMBOL(dev_valid_name);
L
Linus Torvalds 已提交
868 869

/**
870 871
 *	__dev_alloc_name - allocate a name for a device
 *	@net: network namespace to allocate the device name in
L
Linus Torvalds 已提交
872
 *	@name: name format string
873
 *	@buf:  scratch buffer and result name string
L
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874 875
 *
 *	Passed a format string - eg "lt%d" it will try and find a suitable
S
Stephen Hemminger 已提交
876 877 878 879 880 881
 *	id. It scans list of devices to build up a free map, then chooses
 *	the first empty slot. The caller must hold the dev_base or rtnl lock
 *	while allocating the name and adding the device in order to avoid
 *	duplicates.
 *	Limited to bits_per_byte * page size devices (ie 32K on most platforms).
 *	Returns the number of the unit assigned or a negative errno code.
L
Linus Torvalds 已提交
882 883
 */

884
static int __dev_alloc_name(struct net *net, const char *name, char *buf)
L
Linus Torvalds 已提交
885 886 887 888
{
	int i = 0;
	const char *p;
	const int max_netdevices = 8*PAGE_SIZE;
S
Stephen Hemminger 已提交
889
	unsigned long *inuse;
L
Linus Torvalds 已提交
890 891 892 893 894 895 896 897 898 899 900 901 902
	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
903
		inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
L
Linus Torvalds 已提交
904 905 906
		if (!inuse)
			return -ENOMEM;

907
		for_each_netdev(net, d) {
L
Linus Torvalds 已提交
908 909 910 911 912 913
			if (!sscanf(d->name, name, &i))
				continue;
			if (i < 0 || i >= max_netdevices)
				continue;

			/*  avoid cases where sscanf is not exact inverse of printf */
914
			snprintf(buf, IFNAMSIZ, name, i);
L
Linus Torvalds 已提交
915 916 917 918 919 920 921 922
			if (!strncmp(buf, d->name, IFNAMSIZ))
				set_bit(i, inuse);
		}

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

923 924
	if (buf != name)
		snprintf(buf, IFNAMSIZ, name, i);
925
	if (!__dev_get_by_name(net, buf))
L
Linus Torvalds 已提交
926 927 928 929 930 931 932 933 934
		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;
}

935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954
/**
 *	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;

955 956
	BUG_ON(!dev_net(dev));
	net = dev_net(dev);
957 958 959 960 961
	ret = __dev_alloc_name(net, name, buf);
	if (ret >= 0)
		strlcpy(dev->name, buf, IFNAMSIZ);
	return ret;
}
E
Eric Dumazet 已提交
962
EXPORT_SYMBOL(dev_alloc_name);
963

964
static int dev_get_valid_name(struct net_device *dev, const char *name)
965
{
966 967 968 969 970
	struct net *net;

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

971 972 973
	if (!dev_valid_name(name))
		return -EINVAL;

974
	if (strchr(name, '%'))
975
		return dev_alloc_name(dev, name);
976 977
	else if (__dev_get_by_name(net, name))
		return -EEXIST;
978 979
	else if (dev->name != name)
		strlcpy(dev->name, name, IFNAMSIZ);
980 981 982

	return 0;
}
L
Linus Torvalds 已提交
983 984 985 986 987 988 989 990 991

/**
 *	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.
 */
992
int dev_change_name(struct net_device *dev, const char *newname)
L
Linus Torvalds 已提交
993
{
994
	char oldname[IFNAMSIZ];
L
Linus Torvalds 已提交
995
	int err = 0;
996
	int ret;
997
	struct net *net;
L
Linus Torvalds 已提交
998 999

	ASSERT_RTNL();
1000
	BUG_ON(!dev_net(dev));
L
Linus Torvalds 已提交
1001

1002
	net = dev_net(dev);
L
Linus Torvalds 已提交
1003 1004 1005
	if (dev->flags & IFF_UP)
		return -EBUSY;

1006 1007 1008
	if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
		return 0;

1009 1010
	memcpy(oldname, dev->name, IFNAMSIZ);

1011
	err = dev_get_valid_name(dev, newname);
1012 1013
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
1014

1015
rollback:
1016 1017 1018 1019
	ret = device_rename(&dev->dev, dev->name);
	if (ret) {
		memcpy(dev->name, oldname, IFNAMSIZ);
		return ret;
1020
	}
1021 1022

	write_lock_bh(&dev_base_lock);
1023
	hlist_del_rcu(&dev->name_hlist);
1024 1025 1026 1027 1028 1029
	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));
1030 1031
	write_unlock_bh(&dev_base_lock);

1032
	ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1033 1034 1035
	ret = notifier_to_errno(ret);

	if (ret) {
1036 1037
		/* err >= 0 after dev_alloc_name() or stores the first errno */
		if (err >= 0) {
1038 1039 1040
			err = ret;
			memcpy(dev->name, oldname, IFNAMSIZ);
			goto rollback;
1041 1042 1043 1044
		} else {
			printk(KERN_ERR
			       "%s: name change rollback failed: %d.\n",
			       dev->name, ret);
1045 1046
		}
	}
L
Linus Torvalds 已提交
1047 1048 1049 1050

	return err;
}

1051 1052 1053 1054
/**
 *	dev_set_alias - change ifalias of a device
 *	@dev: device
 *	@alias: name up to IFALIASZ
1055
 *	@len: limit of bytes to copy from info
1056 1057 1058 1059 1060 1061 1062 1063 1064 1065
 *
 *	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;

1066 1067 1068 1069 1070 1071 1072 1073
	if (!len) {
		if (dev->ifalias) {
			kfree(dev->ifalias);
			dev->ifalias = NULL;
		}
		return 0;
	}

E
Eric Dumazet 已提交
1074
	dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1075 1076 1077 1078 1079 1080 1081 1082
	if (!dev->ifalias)
		return -ENOMEM;

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


1083
/**
S
Stephen Hemminger 已提交
1084
 *	netdev_features_change - device changes features
1085 1086 1087 1088 1089 1090
 *	@dev: device to cause notification
 *
 *	Called to indicate a device has changed features.
 */
void netdev_features_change(struct net_device *dev)
{
1091
	call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1092 1093 1094
}
EXPORT_SYMBOL(netdev_features_change);

L
Linus Torvalds 已提交
1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105
/**
 *	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) {
1106
		call_netdevice_notifiers(NETDEV_CHANGE, dev);
L
Linus Torvalds 已提交
1107 1108 1109
		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
	}
}
E
Eric Dumazet 已提交
1110
EXPORT_SYMBOL(netdev_state_change);
L
Linus Torvalds 已提交
1111

1112
int netdev_bonding_change(struct net_device *dev, unsigned long event)
1113
{
1114
	return call_netdevice_notifiers(event, dev);
1115 1116 1117
}
EXPORT_SYMBOL(netdev_bonding_change);

L
Linus Torvalds 已提交
1118 1119
/**
 *	dev_load 	- load a network module
1120
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
1121 1122 1123 1124 1125 1126 1127
 *	@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.
 */

1128
void dev_load(struct net *net, const char *name)
L
Linus Torvalds 已提交
1129
{
1130
	struct net_device *dev;
1131
	int no_module;
L
Linus Torvalds 已提交
1132

1133 1134 1135
	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
	rcu_read_unlock();
L
Linus Torvalds 已提交
1136

1137 1138 1139 1140 1141 1142 1143 1144 1145
	no_module = !dev;
	if (no_module && capable(CAP_NET_ADMIN))
		no_module = request_module("netdev-%s", name);
	if (no_module && capable(CAP_SYS_MODULE)) {
		if (!request_module("%s", name))
			pr_err("Loading kernel module for a network device "
"with CAP_SYS_MODULE (deprecated).  Use CAP_NET_ADMIN and alias netdev-%s "
"instead\n", name);
	}
L
Linus Torvalds 已提交
1146
}
E
Eric Dumazet 已提交
1147
EXPORT_SYMBOL(dev_load);
L
Linus Torvalds 已提交
1148

1149
static int __dev_open(struct net_device *dev)
L
Linus Torvalds 已提交
1150
{
1151
	const struct net_device_ops *ops = dev->netdev_ops;
1152
	int ret;
L
Linus Torvalds 已提交
1153

1154 1155
	ASSERT_RTNL();

L
Linus Torvalds 已提交
1156 1157 1158
	if (!netif_device_present(dev))
		return -ENODEV;

1159 1160 1161 1162 1163
	ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		return ret;

L
Linus Torvalds 已提交
1164
	set_bit(__LINK_STATE_START, &dev->state);
1165

1166 1167
	if (ops->ndo_validate_addr)
		ret = ops->ndo_validate_addr(dev);
1168

1169 1170
	if (!ret && ops->ndo_open)
		ret = ops->ndo_open(dev);
L
Linus Torvalds 已提交
1171

1172 1173 1174
	if (ret)
		clear_bit(__LINK_STATE_START, &dev->state);
	else {
L
Linus Torvalds 已提交
1175
		dev->flags |= IFF_UP;
1176
		net_dmaengine_get();
1177
		dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
1178 1179
		dev_activate(dev);
	}
1180

L
Linus Torvalds 已提交
1181 1182 1183 1184
	return ret;
}

/**
1185 1186
 *	dev_open	- prepare an interface for use.
 *	@dev:	device to open
L
Linus Torvalds 已提交
1187
 *
1188 1189 1190 1191 1192 1193 1194
 *	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
1195
 */
1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213
int dev_open(struct net_device *dev)
{
	int ret;

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

	ret = __dev_open(dev);
	if (ret < 0)
		return ret;

	rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
	call_netdevice_notifiers(NETDEV_UP, dev);

	return ret;
}
EXPORT_SYMBOL(dev_open);

1214
static int __dev_close_many(struct list_head *head)
L
Linus Torvalds 已提交
1215
{
1216
	struct net_device *dev;
1217

1218
	ASSERT_RTNL();
1219 1220
	might_sleep();

1221 1222
	list_for_each_entry(dev, head, unreg_list) {
		call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
L
Linus Torvalds 已提交
1223

1224
		clear_bit(__LINK_STATE_START, &dev->state);
L
Linus Torvalds 已提交
1225

1226 1227 1228 1229 1230 1231 1232 1233
		/* 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
1234

1235
	dev_deactivate_many(head);
1236

1237 1238
	list_for_each_entry(dev, head, unreg_list) {
		const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
1239

1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258
		/*
		 *	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);

		dev->flags &= ~IFF_UP;
		net_dmaengine_put();
	}

	return 0;
}

static int __dev_close(struct net_device *dev)
{
1259
	int retval;
1260 1261 1262
	LIST_HEAD(single);

	list_add(&dev->unreg_list, &single);
1263 1264 1265
	retval = __dev_close_many(&single);
	list_del(&single);
	return retval;
1266 1267
}

E
Eric Dumazet 已提交
1268
static int dev_close_many(struct list_head *head)
1269 1270 1271
{
	struct net_device *dev, *tmp;
	LIST_HEAD(tmp_list);
L
Linus Torvalds 已提交
1272

1273 1274 1275 1276 1277
	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
1278

1279 1280 1281 1282
	list_for_each_entry(dev, head, unreg_list) {
		rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
		call_netdevice_notifiers(NETDEV_DOWN, dev);
	}
1283

1284 1285
	/* rollback_registered_many needs the complete original list */
	list_splice(&tmp_list, head);
1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299
	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)
{
1300 1301
	if (dev->flags & IFF_UP) {
		LIST_HEAD(single);
L
Linus Torvalds 已提交
1302

1303 1304 1305 1306
		list_add(&dev->unreg_list, &single);
		dev_close_many(&single);
		list_del(&single);
	}
L
Linus Torvalds 已提交
1307 1308
	return 0;
}
E
Eric Dumazet 已提交
1309
EXPORT_SYMBOL(dev_close);
L
Linus Torvalds 已提交
1310 1311


1312 1313 1314 1315 1316 1317 1318 1319 1320 1321
/**
 *	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)
{
1322 1323 1324 1325 1326 1327 1328
	/*
	 * If we're trying to disable lro on a vlan device
	 * use the underlying physical device instead
	 */
	if (is_vlan_dev(dev))
		dev = vlan_dev_real_dev(dev);

M
Michał Mirosław 已提交
1329 1330
	dev->wanted_features &= ~NETIF_F_LRO;
	netdev_update_features(dev);
1331

1332 1333
	if (unlikely(dev->features & NETIF_F_LRO))
		netdev_WARN(dev, "failed to disable LRO!\n");
1334 1335 1336 1337
}
EXPORT_SYMBOL(dev_disable_lro);


1338 1339
static int dev_boot_phase = 1;

L
Linus Torvalds 已提交
1340 1341 1342 1343 1344 1345 1346 1347 1348 1349
/**
 *	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
1350
 *	to the new notifier to allow device to have a race free
L
Linus Torvalds 已提交
1351 1352 1353 1354 1355 1356
 *	view of the network device list.
 */

int register_netdevice_notifier(struct notifier_block *nb)
{
	struct net_device *dev;
1357
	struct net_device *last;
1358
	struct net *net;
L
Linus Torvalds 已提交
1359 1360 1361
	int err;

	rtnl_lock();
1362
	err = raw_notifier_chain_register(&netdev_chain, nb);
1363 1364
	if (err)
		goto unlock;
1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
	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
1376

1377 1378
			nb->notifier_call(nb, NETDEV_UP, dev);
		}
L
Linus Torvalds 已提交
1379
	}
1380 1381

unlock:
L
Linus Torvalds 已提交
1382 1383
	rtnl_unlock();
	return err;
1384 1385 1386

rollback:
	last = dev;
1387 1388 1389 1390
	for_each_net(net) {
		for_each_netdev(net, dev) {
			if (dev == last)
				break;
1391

1392 1393 1394 1395 1396
			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);
1397
			nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1398 1399
		}
	}
1400 1401

	raw_notifier_chain_unregister(&netdev_chain, nb);
1402
	goto unlock;
L
Linus Torvalds 已提交
1403
}
E
Eric Dumazet 已提交
1404
EXPORT_SYMBOL(register_netdevice_notifier);
L
Linus Torvalds 已提交
1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417

/**
 *	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)
{
1418 1419 1420
	int err;

	rtnl_lock();
1421
	err = raw_notifier_chain_unregister(&netdev_chain, nb);
1422 1423
	rtnl_unlock();
	return err;
L
Linus Torvalds 已提交
1424
}
E
Eric Dumazet 已提交
1425
EXPORT_SYMBOL(unregister_netdevice_notifier);
L
Linus Torvalds 已提交
1426 1427 1428 1429

/**
 *	call_netdevice_notifiers - call all network notifier blocks
 *      @val: value passed unmodified to notifier function
1430
 *      @dev: net_device pointer passed unmodified to notifier function
L
Linus Torvalds 已提交
1431 1432
 *
 *	Call all network notifier blocks.  Parameters and return value
1433
 *	are as for raw_notifier_call_chain().
L
Linus Torvalds 已提交
1434 1435
 */

1436
int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
L
Linus Torvalds 已提交
1437
{
1438
	ASSERT_RTNL();
1439
	return raw_notifier_call_chain(&netdev_chain, val, dev);
L
Linus Torvalds 已提交
1440
}
1441
EXPORT_SYMBOL(call_netdevice_notifiers);
L
Linus Torvalds 已提交
1442

1443
static struct jump_label_key netstamp_needed __read_mostly;
1444 1445 1446 1447 1448 1449 1450
#ifdef HAVE_JUMP_LABEL
/* We are not allowed to call jump_label_dec() from irq context
 * If net_disable_timestamp() is called from irq context, defer the
 * jump_label_dec() calls.
 */
static atomic_t netstamp_needed_deferred;
#endif
L
Linus Torvalds 已提交
1451 1452 1453

void net_enable_timestamp(void)
{
1454 1455 1456 1457 1458 1459 1460 1461 1462 1463
#ifdef HAVE_JUMP_LABEL
	int deferred = atomic_xchg(&netstamp_needed_deferred, 0);

	if (deferred) {
		while (--deferred)
			jump_label_dec(&netstamp_needed);
		return;
	}
#endif
	WARN_ON(in_interrupt());
1464
	jump_label_inc(&netstamp_needed);
L
Linus Torvalds 已提交
1465
}
E
Eric Dumazet 已提交
1466
EXPORT_SYMBOL(net_enable_timestamp);
L
Linus Torvalds 已提交
1467 1468 1469

void net_disable_timestamp(void)
{
1470 1471 1472 1473 1474 1475
#ifdef HAVE_JUMP_LABEL
	if (in_interrupt()) {
		atomic_inc(&netstamp_needed_deferred);
		return;
	}
#endif
1476
	jump_label_dec(&netstamp_needed);
L
Linus Torvalds 已提交
1477
}
E
Eric Dumazet 已提交
1478
EXPORT_SYMBOL(net_disable_timestamp);
L
Linus Torvalds 已提交
1479

E
Eric Dumazet 已提交
1480
static inline void net_timestamp_set(struct sk_buff *skb)
L
Linus Torvalds 已提交
1481
{
1482 1483
	skb->tstamp.tv64 = 0;
	if (static_branch(&netstamp_needed))
1484
		__net_timestamp(skb);
L
Linus Torvalds 已提交
1485 1486
}

1487 1488 1489 1490 1491
#define net_timestamp_check(COND, SKB)			\
	if (static_branch(&netstamp_needed)) {		\
		if ((COND) && !(SKB)->tstamp.tv64)	\
			__net_timestamp(SKB);		\
	}						\
E
Eric Dumazet 已提交
1492

1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543
static int net_hwtstamp_validate(struct ifreq *ifr)
{
	struct hwtstamp_config cfg;
	enum hwtstamp_tx_types tx_type;
	enum hwtstamp_rx_filters rx_filter;
	int tx_type_valid = 0;
	int rx_filter_valid = 0;

	if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
		return -EFAULT;

	if (cfg.flags) /* reserved for future extensions */
		return -EINVAL;

	tx_type = cfg.tx_type;
	rx_filter = cfg.rx_filter;

	switch (tx_type) {
	case HWTSTAMP_TX_OFF:
	case HWTSTAMP_TX_ON:
	case HWTSTAMP_TX_ONESTEP_SYNC:
		tx_type_valid = 1;
		break;
	}

	switch (rx_filter) {
	case HWTSTAMP_FILTER_NONE:
	case HWTSTAMP_FILTER_ALL:
	case HWTSTAMP_FILTER_SOME:
	case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
	case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
	case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
	case HWTSTAMP_FILTER_PTP_V2_EVENT:
	case HWTSTAMP_FILTER_PTP_V2_SYNC:
	case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
		rx_filter_valid = 1;
		break;
	}

	if (!tx_type_valid || !rx_filter_valid)
		return -ERANGE;

	return 0;
}

1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564
static inline bool is_skb_forwardable(struct net_device *dev,
				      struct sk_buff *skb)
{
	unsigned int len;

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

	len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
	if (skb->len <= len)
		return true;

	/* if TSO is enabled, we don't care about the length as the packet
	 * could be forwarded without being segmented before
	 */
	if (skb_is_gso(skb))
		return true;

	return false;
}

1565 1566 1567 1568 1569 1570 1571 1572
/**
 * dev_forward_skb - loopback an skb to another netif
 *
 * @dev: destination network device
 * @skb: buffer to forward
 *
 * return values:
 *	NET_RX_SUCCESS	(no congestion)
1573
 *	NET_RX_DROP     (packet was dropped, but freed)
1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584
 *
 * 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)
{
1585 1586 1587 1588 1589 1590 1591 1592
	if (skb_shinfo(skb)->tx_flags & SKBTX_DEV_ZEROCOPY) {
		if (skb_copy_ubufs(skb, GFP_ATOMIC)) {
			atomic_long_inc(&dev->rx_dropped);
			kfree_skb(skb);
			return NET_RX_DROP;
		}
	}

1593
	skb_orphan(skb);
1594
	nf_reset(skb);
1595

1596
	if (unlikely(!is_skb_forwardable(dev, skb))) {
1597
		atomic_long_inc(&dev->rx_dropped);
1598
		kfree_skb(skb);
1599
		return NET_RX_DROP;
1600
	}
1601
	skb_set_dev(skb, dev);
1602 1603 1604 1605 1606 1607 1608
	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);

1609 1610 1611 1612 1613 1614 1615 1616
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
1617 1618 1619 1620 1621
/*
 *	Support routine. Sends outgoing frames to any network
 *	taps currently in use.
 */

1622
static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
L
Linus Torvalds 已提交
1623 1624
{
	struct packet_type *ptype;
1625 1626
	struct sk_buff *skb2 = NULL;
	struct packet_type *pt_prev = NULL;
1627

L
Linus Torvalds 已提交
1628 1629 1630 1631 1632 1633 1634 1635
	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)) {
1636 1637 1638 1639 1640 1641 1642
			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
1643 1644 1645
			if (!skb2)
				break;

1646 1647
			net_timestamp_set(skb2);

L
Linus Torvalds 已提交
1648 1649 1650 1651
			/* skb->nh should be correctly
			   set by sender, so that the second statement is
			   just protection against buggy protocols.
			 */
1652
			skb_reset_mac_header(skb2);
L
Linus Torvalds 已提交
1653

1654
			if (skb_network_header(skb2) < skb2->data ||
1655
			    skb2->network_header > skb2->tail) {
L
Linus Torvalds 已提交
1656 1657 1658
				if (net_ratelimit())
					printk(KERN_CRIT "protocol %04x is "
					       "buggy, dev %s\n",
1659 1660
					       ntohs(skb2->protocol),
					       dev->name);
1661
				skb_reset_network_header(skb2);
L
Linus Torvalds 已提交
1662 1663
			}

1664
			skb2->transport_header = skb2->network_header;
L
Linus Torvalds 已提交
1665
			skb2->pkt_type = PACKET_OUTGOING;
1666
			pt_prev = ptype;
L
Linus Torvalds 已提交
1667 1668
		}
	}
1669 1670
	if (pt_prev)
		pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
L
Linus Torvalds 已提交
1671 1672 1673
	rcu_read_unlock();
}

1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
/* 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
1686
static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715
{
	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);
		}
	}
}

1716 1717 1718 1719
/*
 * 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.
 */
1720
int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1721
{
T
Tom Herbert 已提交
1722 1723
	int rc;

1724 1725
	if (txq < 1 || txq > dev->num_tx_queues)
		return -EINVAL;
1726

1727 1728
	if (dev->reg_state == NETREG_REGISTERED ||
	    dev->reg_state == NETREG_UNREGISTERING) {
1729 1730
		ASSERT_RTNL();

T
Tom Herbert 已提交
1731 1732
		rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
						  txq);
T
Tom Herbert 已提交
1733 1734 1735
		if (rc)
			return rc;

1736 1737 1738
		if (dev->num_tc)
			netif_setup_tc(dev, txq);

1739 1740
		if (txq < dev->real_num_tx_queues)
			qdisc_reset_all_tx_gt(dev, txq);
1741
	}
1742 1743 1744

	dev->real_num_tx_queues = txq;
	return 0;
1745 1746
}
EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1747

1748 1749 1750 1751 1752 1753 1754 1755
#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
1756 1757
 *	negative error code.  If called before registration, it always
 *	succeeds.
1758 1759 1760 1761 1762
 */
int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
{
	int rc;

T
Tom Herbert 已提交
1763 1764 1765
	if (rxq < 1 || rxq > dev->num_rx_queues)
		return -EINVAL;

1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780
	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

1781
static inline void __netif_reschedule(struct Qdisc *q)
1782
{
1783 1784
	struct softnet_data *sd;
	unsigned long flags;
1785

1786 1787
	local_irq_save(flags);
	sd = &__get_cpu_var(softnet_data);
1788 1789 1790
	q->next_sched = NULL;
	*sd->output_queue_tailp = q;
	sd->output_queue_tailp = &q->next_sched;
1791 1792 1793 1794 1795 1796 1797 1798
	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);
1799 1800 1801
}
EXPORT_SYMBOL(__netif_schedule);

1802
void dev_kfree_skb_irq(struct sk_buff *skb)
1803
{
1804
	if (atomic_dec_and_test(&skb->users)) {
1805 1806
		struct softnet_data *sd;
		unsigned long flags;
1807

1808 1809 1810 1811 1812 1813 1814
		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);
	}
1815
}
1816
EXPORT_SYMBOL(dev_kfree_skb_irq);
1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827

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);


1828 1829 1830 1831 1832 1833
/**
 * netif_device_detach - mark device as removed
 * @dev: network device
 *
 * Mark device as removed from system and therefore no longer available.
 */
1834 1835 1836 1837
void netif_device_detach(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
1838
		netif_tx_stop_all_queues(dev);
1839 1840 1841 1842
	}
}
EXPORT_SYMBOL(netif_device_detach);

1843 1844 1845 1846 1847 1848
/**
 * netif_device_attach - mark device as attached
 * @dev: network device
 *
 * Mark device as attached from system and restart if needed.
 */
1849 1850 1851 1852
void netif_device_attach(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
1853
		netif_tx_wake_all_queues(dev);
1854
		__netdev_watchdog_up(dev);
1855 1856 1857 1858
	}
}
EXPORT_SYMBOL(netif_device_attach);

1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888
/**
 * 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
1889 1890 1891 1892
/*
 * Invalidate hardware checksum when packet is to be mangled, and
 * complete checksum manually on outgoing path.
 */
1893
int skb_checksum_help(struct sk_buff *skb)
L
Linus Torvalds 已提交
1894
{
1895
	__wsum csum;
1896
	int ret = 0, offset;
L
Linus Torvalds 已提交
1897

1898
	if (skb->ip_summed == CHECKSUM_COMPLETE)
1899 1900 1901 1902 1903
		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
1904 1905
	}

1906
	offset = skb_checksum_start_offset(skb);
1907 1908 1909 1910 1911 1912 1913 1914
	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
1915 1916 1917 1918 1919
		ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
		if (ret)
			goto out;
	}

1920
	*(__sum16 *)(skb->data + offset) = csum_fold(csum);
1921
out_set_summed:
L
Linus Torvalds 已提交
1922
	skb->ip_summed = CHECKSUM_NONE;
1923
out:
L
Linus Torvalds 已提交
1924 1925
	return ret;
}
E
Eric Dumazet 已提交
1926
EXPORT_SYMBOL(skb_checksum_help);
L
Linus Torvalds 已提交
1927

1928 1929 1930
/**
 *	skb_gso_segment - Perform segmentation on skb.
 *	@skb: buffer to segment
1931
 *	@features: features for the output path (see dev->features)
1932 1933
 *
 *	This function segments the given skb and returns a list of segments.
1934 1935 1936
 *
 *	It may return NULL if the skb requires no segmentation.  This is
 *	only possible when GSO is used for verifying header integrity.
1937
 */
1938 1939
struct sk_buff *skb_gso_segment(struct sk_buff *skb,
	netdev_features_t features)
1940 1941 1942
{
	struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
	struct packet_type *ptype;
A
Al Viro 已提交
1943
	__be16 type = skb->protocol;
1944
	int vlan_depth = ETH_HLEN;
1945
	int err;
1946

1947 1948
	while (type == htons(ETH_P_8021Q)) {
		struct vlan_hdr *vh;
1949

1950
		if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1951 1952
			return ERR_PTR(-EINVAL);

1953 1954 1955
		vh = (struct vlan_hdr *)(skb->data + vlan_depth);
		type = vh->h_vlan_encapsulated_proto;
		vlan_depth += VLAN_HLEN;
1956 1957
	}

1958
	skb_reset_mac_header(skb);
1959
	skb->mac_len = skb->network_header - skb->mac_header;
1960 1961
	__skb_pull(skb, skb->mac_len);

1962 1963 1964 1965 1966 1967 1968
	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);

1969 1970 1971
		WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d ip_summed=%d\n",
		     info.driver, dev ? &dev->features : NULL,
		     skb->sk ? &skb->sk->sk_route_caps : NULL,
1972 1973
		     skb->len, skb->data_len, skb->ip_summed);

1974 1975 1976 1977 1978
		if (skb_header_cloned(skb) &&
		    (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
			return ERR_PTR(err);
	}

1979
	rcu_read_lock();
1980 1981
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1982
		if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1983
			if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1984 1985 1986 1987
				err = ptype->gso_send_check(skb);
				segs = ERR_PTR(err);
				if (err || skb_gso_ok(skb, features))
					break;
1988 1989
				__skb_push(skb, (skb->data -
						 skb_network_header(skb)));
1990
			}
1991
			segs = ptype->gso_segment(skb, features);
1992 1993 1994 1995 1996
			break;
		}
	}
	rcu_read_unlock();

1997
	__skb_push(skb, skb->data - skb_mac_header(skb));
1998

1999 2000 2001 2002
	return segs;
}
EXPORT_SYMBOL(skb_gso_segment);

2003 2004 2005 2006 2007
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG
void netdev_rx_csum_fault(struct net_device *dev)
{
	if (net_ratelimit()) {
2008
		printk(KERN_ERR "%s: hw csum failure.\n",
2009
			dev ? dev->name : "<unknown>");
2010 2011 2012 2013 2014 2015
		dump_stack();
	}
}
EXPORT_SYMBOL(netdev_rx_csum_fault);
#endif

L
Linus Torvalds 已提交
2016 2017 2018 2019 2020
/* 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
2021
static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
L
Linus Torvalds 已提交
2022
{
2023
#ifdef CONFIG_HIGHMEM
L
Linus Torvalds 已提交
2024
	int i;
2025
	if (!(dev->features & NETIF_F_HIGHDMA)) {
2026 2027 2028
		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
			if (PageHighMem(skb_frag_page(frag)))
2029
				return 1;
2030
		}
2031
	}
L
Linus Torvalds 已提交
2032

2033 2034
	if (PCI_DMA_BUS_IS_PHYS) {
		struct device *pdev = dev->dev.parent;
L
Linus Torvalds 已提交
2035

E
Eric Dumazet 已提交
2036 2037
		if (!pdev)
			return 0;
2038
		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2039 2040
			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
			dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2041 2042 2043 2044
			if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
				return 1;
		}
	}
2045
#endif
L
Linus Torvalds 已提交
2046 2047 2048
	return 0;
}

2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074
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
2075
 *	@features: device features as applicable to this skb
2076 2077 2078 2079
 *
 *	This function segments the given skb and stores the list of segments
 *	in skb->next.
 */
2080
static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features)
2081 2082
{
	struct sk_buff *segs;
2083 2084 2085 2086 2087 2088

	segs = skb_gso_segment(skb, features);

	/* Verifying header integrity only. */
	if (!segs)
		return 0;
2089

2090
	if (IS_ERR(segs))
2091 2092 2093 2094 2095 2096 2097 2098 2099
		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
2100 2101
/*
 * Try to orphan skb early, right before transmission by the device.
2102 2103
 * 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
2104 2105 2106
 */
static inline void skb_orphan_try(struct sk_buff *skb)
{
2107 2108
	struct sock *sk = skb->sk;

2109
	if (sk && !skb_shinfo(skb)->tx_flags) {
2110 2111 2112 2113 2114
		/* 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
2115
		skb_orphan(skb);
2116
	}
E
Eric Dumazet 已提交
2117 2118
}

2119
static bool can_checksum_protocol(netdev_features_t features, __be16 protocol)
2120 2121 2122 2123 2124 2125 2126 2127 2128 2129
{
	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)));
}

2130 2131
static netdev_features_t harmonize_features(struct sk_buff *skb,
	__be16 protocol, netdev_features_t features)
2132
{
2133
	if (!can_checksum_protocol(features, protocol)) {
2134 2135 2136 2137 2138 2139 2140 2141 2142
		features &= ~NETIF_F_ALL_CSUM;
		features &= ~NETIF_F_SG;
	} else if (illegal_highdma(skb->dev, skb)) {
		features &= ~NETIF_F_SG;
	}

	return features;
}

2143
netdev_features_t netif_skb_features(struct sk_buff *skb)
2144 2145
{
	__be16 protocol = skb->protocol;
2146
	netdev_features_t features = skb->dev->features;
2147 2148 2149 2150

	if (protocol == htons(ETH_P_8021Q)) {
		struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
		protocol = veh->h_vlan_encapsulated_proto;
2151 2152 2153
	} else if (!vlan_tx_tag_present(skb)) {
		return harmonize_features(skb, protocol, features);
	}
2154

2155
	features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2156 2157 2158 2159 2160

	if (protocol != htons(ETH_P_8021Q)) {
		return harmonize_features(skb, protocol, features);
	} else {
		features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2161
				NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2162 2163
		return harmonize_features(skb, protocol, features);
	}
2164
}
2165
EXPORT_SYMBOL(netif_skb_features);
2166

2167 2168 2169 2170 2171 2172 2173 2174
/*
 * 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,
2175
				      int features)
2176
{
2177 2178 2179
	return skb_is_nonlinear(skb) &&
			((skb_has_frag_list(skb) &&
				!(features & NETIF_F_FRAGLIST)) ||
2180
			(skb_shinfo(skb)->nr_frags &&
2181
				!(features & NETIF_F_SG)));
2182 2183
}

2184 2185
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
			struct netdev_queue *txq)
2186
{
2187
	const struct net_device_ops *ops = dev->netdev_ops;
2188
	int rc = NETDEV_TX_OK;
2189
	unsigned int skb_len;
2190

2191
	if (likely(!skb->next)) {
2192
		netdev_features_t features;
2193

2194
		/*
L
Lucas De Marchi 已提交
2195
		 * If device doesn't need skb->dst, release it right now while
2196 2197
		 * its hot in this cpu cache
		 */
E
Eric Dumazet 已提交
2198 2199 2200
		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
			skb_dst_drop(skb);

2201 2202 2203
		if (!list_empty(&ptype_all))
			dev_queue_xmit_nit(skb, dev);

E
Eric Dumazet 已提交
2204
		skb_orphan_try(skb);
2205

2206 2207
		features = netif_skb_features(skb);

2208
		if (vlan_tx_tag_present(skb) &&
2209
		    !(features & NETIF_F_HW_VLAN_TX)) {
2210 2211 2212 2213 2214 2215 2216
			skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
			if (unlikely(!skb))
				goto out;

			skb->vlan_tci = 0;
		}

2217
		if (netif_needs_gso(skb, features)) {
2218
			if (unlikely(dev_gso_segment(skb, features)))
2219 2220 2221
				goto out_kfree_skb;
			if (skb->next)
				goto gso;
2222
		} else {
2223
			if (skb_needs_linearize(skb, features) &&
2224 2225 2226 2227 2228 2229 2230 2231
			    __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) {
2232 2233
				skb_set_transport_header(skb,
					skb_checksum_start_offset(skb));
2234
				if (!(features & NETIF_F_ALL_CSUM) &&
2235 2236 2237
				     skb_checksum_help(skb))
					goto out_kfree_skb;
			}
2238 2239
		}

2240
		skb_len = skb->len;
2241
		rc = ops->ndo_start_xmit(skb, dev);
2242
		trace_net_dev_xmit(skb, rc, dev, skb_len);
2243
		if (rc == NETDEV_TX_OK)
E
Eric Dumazet 已提交
2244
			txq_trans_update(txq);
2245
		return rc;
2246 2247
	}

2248
gso:
2249 2250 2251 2252 2253
	do {
		struct sk_buff *nskb = skb->next;

		skb->next = nskb->next;
		nskb->next = NULL;
2254 2255

		/*
L
Lucas De Marchi 已提交
2256
		 * If device doesn't need nskb->dst, release it right now while
2257 2258 2259 2260 2261
		 * its hot in this cpu cache
		 */
		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
			skb_dst_drop(nskb);

2262
		skb_len = nskb->len;
2263
		rc = ops->ndo_start_xmit(nskb, dev);
2264
		trace_net_dev_xmit(nskb, rc, dev, skb_len);
2265
		if (unlikely(rc != NETDEV_TX_OK)) {
2266 2267
			if (rc & ~NETDEV_TX_MASK)
				goto out_kfree_gso_skb;
2268
			nskb->next = skb->next;
2269 2270 2271
			skb->next = nskb;
			return rc;
		}
E
Eric Dumazet 已提交
2272
		txq_trans_update(txq);
2273
		if (unlikely(netif_xmit_stopped(txq) && skb->next))
2274
			return NETDEV_TX_BUSY;
2275
	} while (skb->next);
2276

2277 2278 2279
out_kfree_gso_skb:
	if (likely(skb->next == NULL))
		skb->destructor = DEV_GSO_CB(skb)->destructor;
2280 2281
out_kfree_skb:
	kfree_skb(skb);
2282
out:
2283
	return rc;
2284 2285
}

T
Tom Herbert 已提交
2286
static u32 hashrnd __read_mostly;
D
David S. Miller 已提交
2287

2288 2289 2290 2291 2292 2293
/*
 * 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)
2294
{
2295
	u32 hash;
2296 2297
	u16 qoffset = 0;
	u16 qcount = num_tx_queues;
D
David S. Miller 已提交
2298

2299 2300
	if (skb_rx_queue_recorded(skb)) {
		hash = skb_get_rx_queue(skb);
2301 2302
		while (unlikely(hash >= num_tx_queues))
			hash -= num_tx_queues;
2303 2304
		return hash;
	}
2305

2306 2307 2308 2309 2310 2311
	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;
	}

2312
	if (skb->sk && skb->sk->sk_hash)
2313
		hash = skb->sk->sk_hash;
2314
	else
2315
		hash = (__force u16) skb->protocol ^ skb->rxhash;
T
Tom Herbert 已提交
2316
	hash = jhash_1word(hash, hashrnd);
D
David S. Miller 已提交
2317

2318
	return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2319
}
2320
EXPORT_SYMBOL(__skb_tx_hash);
2321

2322 2323 2324 2325
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
2326 2327 2328
			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);
2329 2330 2331 2332 2333 2334
		}
		return 0;
	}
	return queue_index;
}

T
Tom Herbert 已提交
2335 2336
static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
{
T
Tom Herbert 已提交
2337
#ifdef CONFIG_XPS
T
Tom Herbert 已提交
2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372
	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
}

2373 2374 2375
static struct netdev_queue *dev_pick_tx(struct net_device *dev,
					struct sk_buff *skb)
{
2376
	int queue_index;
2377
	const struct net_device_ops *ops = dev->netdev_ops;
2378

2379 2380 2381
	if (dev->real_num_tx_queues == 1)
		queue_index = 0;
	else if (ops->ndo_select_queue) {
2382 2383 2384 2385 2386
		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);
2387

2388 2389 2390
		if (queue_index < 0 || skb->ooo_okay ||
		    queue_index >= dev->real_num_tx_queues) {
			int old_index = queue_index;
2391

T
Tom Herbert 已提交
2392 2393 2394
			queue_index = get_xps_queue(dev, skb);
			if (queue_index < 0)
				queue_index = skb_tx_hash(dev, skb);
2395 2396 2397 2398

			if (queue_index != old_index && sk) {
				struct dst_entry *dst =
				    rcu_dereference_check(sk->sk_dst_cache, 1);
E
Eric Dumazet 已提交
2399 2400 2401 2402

				if (dst && skb_dst(skb) == dst)
					sk_tx_queue_set(sk, queue_index);
			}
2403 2404
		}
	}
2405

2406 2407
	skb_set_queue_mapping(skb, queue_index);
	return netdev_get_tx_queue(dev, queue_index);
2408 2409
}

2410 2411 2412 2413 2414
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
2415
	bool contended;
2416 2417
	int rc;

E
Eric Dumazet 已提交
2418 2419
	qdisc_skb_cb(skb)->pkt_len = skb->len;
	qdisc_calculate_pkt_len(skb, q);
2420 2421 2422 2423 2424 2425
	/*
	 * 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
2426
	contended = qdisc_is_running(q);
2427 2428 2429
	if (unlikely(contended))
		spin_lock(&q->busylock);

2430 2431 2432 2433 2434
	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) &&
2435
		   qdisc_run_begin(q)) {
2436 2437 2438 2439 2440
		/*
		 * 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
2441 2442
		if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
			skb_dst_force(skb);
2443 2444 2445

		qdisc_bstats_update(q, skb);

2446 2447 2448 2449 2450
		if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
			if (unlikely(contended)) {
				spin_unlock(&q->busylock);
				contended = false;
			}
2451
			__qdisc_run(q);
2452
		} else
2453
			qdisc_run_end(q);
2454 2455 2456

		rc = NET_XMIT_SUCCESS;
	} else {
E
Eric Dumazet 已提交
2457
		skb_dst_force(skb);
E
Eric Dumazet 已提交
2458
		rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2459 2460 2461 2462 2463 2464 2465
		if (qdisc_run_begin(q)) {
			if (unlikely(contended)) {
				spin_unlock(&q->busylock);
				contended = false;
			}
			__qdisc_run(q);
		}
2466 2467
	}
	spin_unlock(root_lock);
2468 2469
	if (unlikely(contended))
		spin_unlock(&q->busylock);
2470 2471 2472
	return rc;
}

2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484
#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
static void skb_update_prio(struct sk_buff *skb)
{
	struct netprio_map *map = rcu_dereference(skb->dev->priomap);

	if ((!skb->priority) && (skb->sk) && map)
		skb->priority = map->priomap[skb->sk->sk_cgrp_prioidx];
}
#else
#define skb_update_prio(skb)
#endif

2485
static DEFINE_PER_CPU(int, xmit_recursion);
2486
#define RECURSION_LIMIT 10
2487

2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512
/**
 *	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
2513 2514 2515
int dev_queue_xmit(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
2516
	struct netdev_queue *txq;
L
Linus Torvalds 已提交
2517 2518 2519
	struct Qdisc *q;
	int rc = -ENOMEM;

2520 2521
	/* Disable soft irqs for various locks below. Also
	 * stops preemption for RCU.
L
Linus Torvalds 已提交
2522
	 */
2523
	rcu_read_lock_bh();
L
Linus Torvalds 已提交
2524

2525 2526
	skb_update_prio(skb);

2527
	txq = dev_pick_tx(dev, skb);
2528
	q = rcu_dereference_bh(txq->qdisc);
2529

L
Linus Torvalds 已提交
2530
#ifdef CONFIG_NET_CLS_ACT
E
Eric Dumazet 已提交
2531
	skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
L
Linus Torvalds 已提交
2532
#endif
2533
	trace_net_dev_queue(skb);
L
Linus Torvalds 已提交
2534
	if (q->enqueue) {
2535
		rc = __dev_xmit_skb(skb, q, dev, txq);
2536
		goto out;
L
Linus Torvalds 已提交
2537 2538 2539 2540 2541
	}

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

H
Herbert Xu 已提交
2542 2543
	   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
2544 2545 2546 2547 2548 2549 2550 2551 2552 2553
	   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 */

2554
		if (txq->xmit_lock_owner != cpu) {
L
Linus Torvalds 已提交
2555

2556 2557 2558
			if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
				goto recursion_alert;

2559
			HARD_TX_LOCK(dev, txq, cpu);
L
Linus Torvalds 已提交
2560

2561
			if (!netif_xmit_stopped(txq)) {
2562
				__this_cpu_inc(xmit_recursion);
2563
				rc = dev_hard_start_xmit(skb, dev, txq);
2564
				__this_cpu_dec(xmit_recursion);
2565
				if (dev_xmit_complete(rc)) {
2566
					HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
2567 2568 2569
					goto out;
				}
			}
2570
			HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
2571 2572 2573 2574 2575
			if (net_ratelimit())
				printk(KERN_CRIT "Virtual device %s asks to "
				       "queue packet!\n", dev->name);
		} else {
			/* Recursion is detected! It is possible,
2576 2577 2578
			 * unfortunately
			 */
recursion_alert:
L
Linus Torvalds 已提交
2579 2580 2581 2582 2583 2584 2585
			if (net_ratelimit())
				printk(KERN_CRIT "Dead loop on virtual device "
				       "%s, fix it urgently!\n", dev->name);
		}
	}

	rc = -ENETDOWN;
2586
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
2587 2588 2589 2590

	kfree_skb(skb);
	return rc;
out:
2591
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
2592 2593
	return rc;
}
E
Eric Dumazet 已提交
2594
EXPORT_SYMBOL(dev_queue_xmit);
L
Linus Torvalds 已提交
2595 2596 2597 2598 2599 2600


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

2601
int netdev_max_backlog __read_mostly = 1000;
E
Eric Dumazet 已提交
2602
int netdev_tstamp_prequeue __read_mostly = 1;
2603 2604
int netdev_budget __read_mostly = 300;
int weight_p __read_mostly = 64;            /* old backlog weight */
L
Linus Torvalds 已提交
2605

E
Eric Dumazet 已提交
2606 2607 2608 2609 2610 2611 2612 2613
/* 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
2614
/*
2615
 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2616 2617 2618
 * and src/dst port numbers.  Sets rxhash in skb to non-zero hash value
 * on success, zero indicates no valid hash.  Also, sets l4_rxhash in skb
 * if hash is a canonical 4-tuple hash over transport ports.
T
Tom Herbert 已提交
2619
 */
2620
void __skb_get_rxhash(struct sk_buff *skb)
T
Tom Herbert 已提交
2621
{
2622 2623
	struct flow_keys keys;
	u32 hash;
2624

2625 2626
	if (!skb_flow_dissect(skb, &keys))
		return;
2627

2628 2629 2630 2631
	if (keys.ports) {
		if ((__force u16)keys.port16[1] < (__force u16)keys.port16[0])
			swap(keys.port16[0], keys.port16[1]);
		skb->l4_rxhash = 1;
T
Tom Herbert 已提交
2632 2633
	}

E
Eric Dumazet 已提交
2634
	/* get a consistent hash (same value on both flow directions) */
2635 2636
	if ((__force u32)keys.dst < (__force u32)keys.src)
		swap(keys.dst, keys.src);
T
Tom Herbert 已提交
2637

2638 2639 2640
	hash = jhash_3words((__force u32)keys.dst,
			    (__force u32)keys.src,
			    (__force u32)keys.ports, hashrnd);
2641 2642 2643
	if (!hash)
		hash = 1;

2644
	skb->rxhash = hash;
2645 2646 2647 2648 2649 2650
}
EXPORT_SYMBOL(__skb_get_rxhash);

#ifdef CONFIG_RPS

/* One global table that all flow-based protocols share. */
E
Eric Dumazet 已提交
2651
struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2652 2653
EXPORT_SYMBOL(rps_sock_flow_table);

2654 2655
struct jump_label_key rps_needed __read_mostly;

2656 2657 2658 2659
static struct rps_dev_flow *
set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
	    struct rps_dev_flow *rflow, u16 next_cpu)
{
2660
	if (next_cpu != RPS_NO_CPU) {
2661 2662 2663 2664 2665 2666 2667 2668 2669
#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? */
2670 2671
		if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
		    !(dev->features & NETIF_F_NTUPLE))
2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693
			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->filter = rc;
		if (old_rflow->filter == rflow->filter)
			old_rflow->filter = RPS_NO_FILTER;
	out:
#endif
		rflow->last_qtail =
2694
			per_cpu(softnet_data, next_cpu).input_queue_head;
2695 2696
	}

2697
	rflow->cpu = next_cpu;
2698 2699 2700
	return rflow;
}

2701 2702 2703 2704 2705 2706 2707 2708 2709
/*
 * 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
2710
	struct rps_map *map;
2711 2712 2713 2714 2715 2716 2717
	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);
2718 2719 2720 2721 2722
		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);
2723 2724 2725 2726 2727 2728
			goto done;
		}
		rxqueue = dev->_rx + index;
	} else
		rxqueue = dev->_rx;

E
Eric Dumazet 已提交
2729 2730
	map = rcu_dereference(rxqueue->rps_map);
	if (map) {
2731
		if (map->len == 1 &&
2732
		    !rcu_access_pointer(rxqueue->rps_flow_table)) {
2733 2734 2735 2736 2737
			tcpu = map->cpus[0];
			if (cpu_online(tcpu))
				cpu = tcpu;
			goto done;
		}
2738
	} else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
2739
		goto done;
2740
	}
2741

2742
	skb_reset_network_header(skb);
2743 2744 2745
	if (!skb_get_rxhash(skb))
		goto done;

T
Tom Herbert 已提交
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
	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 -
2772 2773 2774
		      rflow->last_qtail)) >= 0))
			rflow = set_rps_cpu(dev, skb, rflow, next_cpu);

T
Tom Herbert 已提交
2775 2776 2777 2778 2779 2780 2781
		if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
			*rflowp = rflow;
			cpu = tcpu;
			goto done;
		}
	}

T
Tom Herbert 已提交
2782
	if (map) {
T
Tom Herbert 已提交
2783
		tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
T
Tom Herbert 已提交
2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794

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

done:
	return cpu;
}

2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834
#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
2835
/* Called from hardirq (IPI) context */
E
Eric Dumazet 已提交
2836
static void rps_trigger_softirq(void *data)
T
Tom Herbert 已提交
2837
{
E
Eric Dumazet 已提交
2838 2839
	struct softnet_data *sd = data;

E
Eric Dumazet 已提交
2840
	____napi_schedule(sd, &sd->backlog);
C
Changli Gao 已提交
2841
	sd->received_rps++;
T
Tom Herbert 已提交
2842
}
E
Eric Dumazet 已提交
2843

T
Tom Herbert 已提交
2844
#endif /* CONFIG_RPS */
T
Tom Herbert 已提交
2845

E
Eric Dumazet 已提交
2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866
/*
 * 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
2867 2868 2869 2870
/*
 * 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
2871 2872
static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
			      unsigned int *qtail)
T
Tom Herbert 已提交
2873
{
E
Eric Dumazet 已提交
2874
	struct softnet_data *sd;
T
Tom Herbert 已提交
2875 2876
	unsigned long flags;

E
Eric Dumazet 已提交
2877
	sd = &per_cpu(softnet_data, cpu);
T
Tom Herbert 已提交
2878 2879 2880

	local_irq_save(flags);

E
Eric Dumazet 已提交
2881
	rps_lock(sd);
2882 2883
	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
2884
enqueue:
E
Eric Dumazet 已提交
2885
			__skb_queue_tail(&sd->input_pkt_queue, skb);
2886
			input_queue_tail_incr_save(sd, qtail);
E
Eric Dumazet 已提交
2887
			rps_unlock(sd);
2888
			local_irq_restore(flags);
T
Tom Herbert 已提交
2889 2890 2891
			return NET_RX_SUCCESS;
		}

2892 2893 2894 2895
		/* 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
2896
			if (!rps_ipi_queued(sd))
E
Eric Dumazet 已提交
2897
				____napi_schedule(sd, &sd->backlog);
T
Tom Herbert 已提交
2898 2899 2900 2901
		}
		goto enqueue;
	}

C
Changli Gao 已提交
2902
	sd->dropped++;
E
Eric Dumazet 已提交
2903
	rps_unlock(sd);
T
Tom Herbert 已提交
2904 2905 2906

	local_irq_restore(flags);

2907
	atomic_long_inc(&skb->dev->rx_dropped);
T
Tom Herbert 已提交
2908 2909 2910
	kfree_skb(skb);
	return NET_RX_DROP;
}
L
Linus Torvalds 已提交
2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928

/**
 *	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)
{
2929
	int ret;
L
Linus Torvalds 已提交
2930 2931 2932 2933 2934

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

2935
	net_timestamp_check(netdev_tstamp_prequeue, skb);
L
Linus Torvalds 已提交
2936

2937
	trace_netif_rx(skb);
E
Eric Dumazet 已提交
2938
#ifdef CONFIG_RPS
2939
	if (static_branch(&rps_needed))	{
T
Tom Herbert 已提交
2940
		struct rps_dev_flow voidflow, *rflow = &voidflow;
2941 2942
		int cpu;

2943
		preempt_disable();
2944
		rcu_read_lock();
T
Tom Herbert 已提交
2945 2946

		cpu = get_rps_cpu(skb->dev, skb, &rflow);
2947 2948
		if (cpu < 0)
			cpu = smp_processor_id();
T
Tom Herbert 已提交
2949 2950 2951

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

2952
		rcu_read_unlock();
2953
		preempt_enable();
2954 2955
	} else
#endif
T
Tom Herbert 已提交
2956 2957 2958 2959 2960
	{
		unsigned int qtail;
		ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
		put_cpu();
	}
2961
	return ret;
L
Linus Torvalds 已提交
2962
}
E
Eric Dumazet 已提交
2963
EXPORT_SYMBOL(netif_rx);
L
Linus Torvalds 已提交
2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994

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;

2995
			WARN_ON(atomic_read(&skb->users));
2996
			trace_kfree_skb(skb, net_tx_action);
L
Linus Torvalds 已提交
2997 2998 2999 3000 3001
			__kfree_skb(skb);
		}
	}

	if (sd->output_queue) {
3002
		struct Qdisc *head;
L
Linus Torvalds 已提交
3003 3004 3005 3006

		local_irq_disable();
		head = sd->output_queue;
		sd->output_queue = NULL;
3007
		sd->output_queue_tailp = &sd->output_queue;
L
Linus Torvalds 已提交
3008 3009 3010
		local_irq_enable();

		while (head) {
3011 3012 3013
			struct Qdisc *q = head;
			spinlock_t *root_lock;

L
Linus Torvalds 已提交
3014 3015
			head = head->next_sched;

3016
			root_lock = qdisc_lock(q);
3017
			if (spin_trylock(root_lock)) {
3018 3019 3020
				smp_mb__before_clear_bit();
				clear_bit(__QDISC_STATE_SCHED,
					  &q->state);
3021 3022
				qdisc_run(q);
				spin_unlock(root_lock);
L
Linus Torvalds 已提交
3023
			} else {
3024
				if (!test_bit(__QDISC_STATE_DEACTIVATED,
3025
					      &q->state)) {
3026
					__netif_reschedule(q);
3027 3028 3029 3030 3031
				} else {
					smp_mb__before_clear_bit();
					clear_bit(__QDISC_STATE_SCHED,
						  &q->state);
				}
L
Linus Torvalds 已提交
3032 3033 3034 3035 3036
			}
		}
	}
}

3037 3038
#if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
    (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3039 3040 3041
/* This hook is defined here for ATM LANE */
int (*br_fdb_test_addr_hook)(struct net_device *dev,
			     unsigned char *addr) __read_mostly;
3042
EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3043
#endif
L
Linus Torvalds 已提交
3044 3045 3046 3047 3048 3049

#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
L
Lucas De Marchi 已提交
3050 3051
 * NOTE: This doesn't stop any functionality; if you dont have
 * the ingress scheduler, you just can't add policies on ingress.
L
Linus Torvalds 已提交
3052 3053
 *
 */
3054
static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
L
Linus Torvalds 已提交
3055 3056
{
	struct net_device *dev = skb->dev;
3057
	u32 ttl = G_TC_RTTL(skb->tc_verd);
3058 3059
	int result = TC_ACT_OK;
	struct Qdisc *q;
3060

3061 3062 3063 3064
	if (unlikely(MAX_RED_LOOP < ttl++)) {
		if (net_ratelimit())
			pr_warning( "Redir loop detected Dropping packet (%d->%d)\n",
			       skb->skb_iif, dev->ifindex);
3065 3066
		return TC_ACT_SHOT;
	}
L
Linus Torvalds 已提交
3067

3068 3069
	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
3070

3071
	q = rxq->qdisc;
3072
	if (q != &noop_qdisc) {
3073
		spin_lock(qdisc_lock(q));
3074 3075
		if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
			result = qdisc_enqueue_root(skb, q);
3076 3077
		spin_unlock(qdisc_lock(q));
	}
3078 3079 3080

	return result;
}
3081

3082 3083 3084 3085
static inline struct sk_buff *handle_ing(struct sk_buff *skb,
					 struct packet_type **pt_prev,
					 int *ret, struct net_device *orig_dev)
{
3086 3087 3088
	struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);

	if (!rxq || rxq->qdisc == &noop_qdisc)
3089
		goto out;
L
Linus Torvalds 已提交
3090

3091 3092 3093
	if (*pt_prev) {
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
		*pt_prev = NULL;
L
Linus Torvalds 已提交
3094 3095
	}

3096
	switch (ing_filter(skb, rxq)) {
3097 3098 3099 3100 3101 3102 3103 3104 3105
	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
3106 3107 3108
}
#endif

3109 3110 3111 3112
/**
 *	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
3113
 *	@rx_handler_data: data pointer that is used by rx handler
3114 3115 3116 3117 3118 3119
 *
 *	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.
3120 3121
 *
 *	For a general description of rx_handler, see enum rx_handler_result.
3122 3123
 */
int netdev_rx_handler_register(struct net_device *dev,
J
Jiri Pirko 已提交
3124 3125
			       rx_handler_func_t *rx_handler,
			       void *rx_handler_data)
3126 3127 3128 3129 3130 3131
{
	ASSERT_RTNL();

	if (dev->rx_handler)
		return -EBUSY;

J
Jiri Pirko 已提交
3132
	rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150
	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();
3151 3152
	RCU_INIT_POINTER(dev->rx_handler, NULL);
	RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3153 3154 3155
}
EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);

3156
static int __netif_receive_skb(struct sk_buff *skb)
L
Linus Torvalds 已提交
3157 3158
{
	struct packet_type *ptype, *pt_prev;
3159
	rx_handler_func_t *rx_handler;
D
David S. Miller 已提交
3160
	struct net_device *orig_dev;
3161
	struct net_device *null_or_dev;
3162
	bool deliver_exact = false;
L
Linus Torvalds 已提交
3163
	int ret = NET_RX_DROP;
A
Al Viro 已提交
3164
	__be16 type;
L
Linus Torvalds 已提交
3165

3166
	net_timestamp_check(!netdev_tstamp_prequeue, skb);
3167

3168
	trace_netif_receive_skb(skb);
3169

L
Linus Torvalds 已提交
3170
	/* if we've gotten here through NAPI, check netpoll */
3171
	if (netpoll_receive_skb(skb))
L
Linus Torvalds 已提交
3172 3173
		return NET_RX_DROP;

3174 3175
	if (!skb->skb_iif)
		skb->skb_iif = skb->dev->ifindex;
J
Joe Eykholt 已提交
3176
	orig_dev = skb->dev;
3177

3178
	skb_reset_network_header(skb);
3179
	skb_reset_transport_header(skb);
3180
	skb_reset_mac_len(skb);
L
Linus Torvalds 已提交
3181 3182 3183 3184 3185

	pt_prev = NULL;

	rcu_read_lock();

3186 3187 3188 3189
another_round:

	__this_cpu_inc(softnet_data.processed);

3190 3191 3192 3193 3194 3195
	if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
		skb = vlan_untag(skb);
		if (unlikely(!skb))
			goto out;
	}

L
Linus Torvalds 已提交
3196 3197 3198 3199 3200 3201 3202 3203
#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) {
3204
		if (!ptype->dev || ptype->dev == skb->dev) {
3205
			if (pt_prev)
D
David S. Miller 已提交
3206
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
3207 3208 3209 3210 3211
			pt_prev = ptype;
		}
	}

#ifdef CONFIG_NET_CLS_ACT
3212 3213
	skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
	if (!skb)
L
Linus Torvalds 已提交
3214 3215 3216 3217
		goto out;
ncls:
#endif

3218
	rx_handler = rcu_dereference(skb->dev->rx_handler);
3219 3220 3221 3222 3223
	if (vlan_tx_tag_present(skb)) {
		if (pt_prev) {
			ret = deliver_skb(skb, pt_prev, orig_dev);
			pt_prev = NULL;
		}
3224
		if (vlan_do_receive(&skb, !rx_handler))
3225 3226 3227 3228 3229
			goto another_round;
		else if (unlikely(!skb))
			goto out;
	}

3230 3231 3232 3233 3234
	if (rx_handler) {
		if (pt_prev) {
			ret = deliver_skb(skb, pt_prev, orig_dev);
			pt_prev = NULL;
		}
3235 3236
		switch (rx_handler(&skb)) {
		case RX_HANDLER_CONSUMED:
3237
			goto out;
3238
		case RX_HANDLER_ANOTHER:
3239
			goto another_round;
3240 3241 3242 3243 3244 3245 3246
		case RX_HANDLER_EXACT:
			deliver_exact = true;
		case RX_HANDLER_PASS:
			break;
		default:
			BUG();
		}
3247
	}
L
Linus Torvalds 已提交
3248

3249
	/* deliver only exact match when indicated */
3250
	null_or_dev = deliver_exact ? skb->dev : NULL;
3251

L
Linus Torvalds 已提交
3252
	type = skb->protocol;
3253 3254
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3255
		if (ptype->type == type &&
3256 3257
		    (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
		     ptype->dev == orig_dev)) {
3258
			if (pt_prev)
D
David S. Miller 已提交
3259
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
3260 3261 3262 3263 3264
			pt_prev = ptype;
		}
	}

	if (pt_prev) {
D
David S. Miller 已提交
3265
		ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
3266
	} else {
3267
		atomic_long_inc(&skb->dev->rx_dropped);
L
Linus Torvalds 已提交
3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278
		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
3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296

/**
 *	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)
{
3297
	net_timestamp_check(netdev_tstamp_prequeue, skb);
E
Eric Dumazet 已提交
3298

3299 3300 3301
	if (skb_defer_rx_timestamp(skb))
		return NET_RX_SUCCESS;

E
Eric Dumazet 已提交
3302
#ifdef CONFIG_RPS
3303
	if (static_branch(&rps_needed)) {
E
Eric Dumazet 已提交
3304 3305
		struct rps_dev_flow voidflow, *rflow = &voidflow;
		int cpu, ret;
T
Tom Herbert 已提交
3306

E
Eric Dumazet 已提交
3307 3308 3309
		rcu_read_lock();

		cpu = get_rps_cpu(skb->dev, skb, &rflow);
T
Tom Herbert 已提交
3310

E
Eric Dumazet 已提交
3311 3312 3313
		if (cpu >= 0) {
			ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
			rcu_read_unlock();
3314
			return ret;
E
Eric Dumazet 已提交
3315
		}
3316
		rcu_read_unlock();
T
Tom Herbert 已提交
3317
	}
3318
#endif
3319
	return __netif_receive_skb(skb);
T
Tom Herbert 已提交
3320
}
E
Eric Dumazet 已提交
3321
EXPORT_SYMBOL(netif_receive_skb);
L
Linus Torvalds 已提交
3322

E
Eric Dumazet 已提交
3323 3324 3325
/* Network device is going away, flush any packets still pending
 * Called with irqs disabled.
 */
3326
static void flush_backlog(void *arg)
3327
{
3328
	struct net_device *dev = arg;
E
Eric Dumazet 已提交
3329
	struct softnet_data *sd = &__get_cpu_var(softnet_data);
3330 3331
	struct sk_buff *skb, *tmp;

E
Eric Dumazet 已提交
3332
	rps_lock(sd);
3333
	skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3334
		if (skb->dev == dev) {
E
Eric Dumazet 已提交
3335
			__skb_unlink(skb, &sd->input_pkt_queue);
3336
			kfree_skb(skb);
3337
			input_queue_head_incr(sd);
3338
		}
3339
	}
E
Eric Dumazet 已提交
3340
	rps_unlock(sd);
3341 3342 3343 3344 3345

	skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
		if (skb->dev == dev) {
			__skb_unlink(skb, &sd->process_queue);
			kfree_skb(skb);
3346
			input_queue_head_incr(sd);
3347 3348
		}
	}
3349 3350
}

3351 3352 3353 3354 3355 3356 3357
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;

3358 3359
	if (NAPI_GRO_CB(skb)->count == 1) {
		skb_shinfo(skb)->gso_size = 0;
3360
		goto out;
3361
	}
3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382

	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
3383
inline void napi_gro_flush(struct napi_struct *napi)
3384 3385 3386 3387 3388 3389 3390 3391 3392
{
	struct sk_buff *skb, *next;

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

3393
	napi->gro_count = 0;
3394 3395
	napi->gro_list = NULL;
}
E
Eric Dumazet 已提交
3396
EXPORT_SYMBOL(napi_gro_flush);
3397

3398
enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3399 3400 3401 3402 3403
{
	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
3404
	int same_flow;
3405
	int mac_len;
3406
	enum gro_result ret;
3407

3408
	if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3409 3410
		goto normal;

3411
	if (skb_is_gso(skb) || skb_has_frag_list(skb))
3412 3413
		goto normal;

3414 3415 3416 3417 3418
	rcu_read_lock();
	list_for_each_entry_rcu(ptype, head, list) {
		if (ptype->type != type || ptype->dev || !ptype->gro_receive)
			continue;

3419
		skb_set_network_header(skb, skb_gro_offset(skb));
3420 3421 3422 3423
		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
3424
		NAPI_GRO_CB(skb)->free = 0;
3425 3426 3427 3428 3429 3430 3431 3432 3433

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

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

H
Herbert Xu 已提交
3434
	same_flow = NAPI_GRO_CB(skb)->same_flow;
3435
	ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
H
Herbert Xu 已提交
3436

3437 3438 3439 3440 3441 3442
	if (pp) {
		struct sk_buff *nskb = *pp;

		*pp = nskb->next;
		nskb->next = NULL;
		napi_gro_complete(nskb);
3443
		napi->gro_count--;
3444 3445
	}

H
Herbert Xu 已提交
3446
	if (same_flow)
3447 3448
		goto ok;

3449
	if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3450 3451
		goto normal;

3452
	napi->gro_count++;
3453
	NAPI_GRO_CB(skb)->count = 1;
3454
	skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3455 3456
	skb->next = napi->gro_list;
	napi->gro_list = skb;
3457
	ret = GRO_HELD;
3458

3459
pull:
H
Herbert Xu 已提交
3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470
	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;
E
Eric Dumazet 已提交
3471
		skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
H
Herbert Xu 已提交
3472

E
Eric Dumazet 已提交
3473
		if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
3474
			skb_frag_unref(skb, 0);
H
Herbert Xu 已提交
3475 3476
			memmove(skb_shinfo(skb)->frags,
				skb_shinfo(skb)->frags + 1,
3477
				--skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
H
Herbert Xu 已提交
3478
		}
3479 3480
	}

3481
ok:
3482
	return ret;
3483 3484

normal:
3485 3486
	ret = GRO_NORMAL;
	goto pull;
H
Herbert Xu 已提交
3487
}
3488 3489
EXPORT_SYMBOL(dev_gro_receive);

3490
static inline gro_result_t
3491
__napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3492 3493 3494 3495
{
	struct sk_buff *p;

	for (p = napi->gro_list; p; p = p->next) {
3496 3497 3498
		unsigned long diffs;

		diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3499
		diffs |= p->vlan_tci ^ skb->vlan_tci;
3500
		diffs |= compare_ether_header(skb_mac_header(p),
3501
					      skb_gro_mac_header(skb));
3502
		NAPI_GRO_CB(p)->same_flow = !diffs;
3503 3504 3505 3506 3507
		NAPI_GRO_CB(p)->flush = 0;
	}

	return dev_gro_receive(napi, skb);
}
H
Herbert Xu 已提交
3508

3509
gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
H
Herbert Xu 已提交
3510
{
3511 3512
	switch (ret) {
	case GRO_NORMAL:
3513 3514 3515
		if (netif_receive_skb(skb))
			ret = GRO_DROP;
		break;
H
Herbert Xu 已提交
3516

3517 3518
	case GRO_DROP:
	case GRO_MERGED_FREE:
H
Herbert Xu 已提交
3519 3520
		kfree_skb(skb);
		break;
3521 3522 3523 3524

	case GRO_HELD:
	case GRO_MERGED:
		break;
H
Herbert Xu 已提交
3525 3526
	}

3527
	return ret;
3528 3529 3530
}
EXPORT_SYMBOL(napi_skb_finish);

3531 3532 3533 3534
void skb_gro_reset_offset(struct sk_buff *skb)
{
	NAPI_GRO_CB(skb)->data_offset = 0;
	NAPI_GRO_CB(skb)->frag0 = NULL;
3535
	NAPI_GRO_CB(skb)->frag0_len = 0;
3536

3537
	if (skb->mac_header == skb->tail &&
3538
	    !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
3539
		NAPI_GRO_CB(skb)->frag0 =
3540
			skb_frag_address(&skb_shinfo(skb)->frags[0]);
E
Eric Dumazet 已提交
3541
		NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]);
3542
	}
3543 3544 3545
}
EXPORT_SYMBOL(skb_gro_reset_offset);

3546
gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3547
{
3548 3549
	skb_gro_reset_offset(skb);

3550
	return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3551 3552 3553
}
EXPORT_SYMBOL(napi_gro_receive);

S
stephen hemminger 已提交
3554
static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3555 3556 3557
{
	__skb_pull(skb, skb_headlen(skb));
	skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
3558
	skb->vlan_tci = 0;
H
Herbert Xu 已提交
3559
	skb->dev = napi->dev;
A
Andy Gospodarek 已提交
3560
	skb->skb_iif = 0;
3561 3562 3563 3564

	napi->skb = skb;
}

3565
struct sk_buff *napi_get_frags(struct napi_struct *napi)
H
Herbert Xu 已提交
3566 3567 3568 3569
{
	struct sk_buff *skb = napi->skb;

	if (!skb) {
3570 3571 3572
		skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
		if (skb)
			napi->skb = skb;
3573
	}
3574 3575
	return skb;
}
3576
EXPORT_SYMBOL(napi_get_frags);
3577

3578 3579
gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
			       gro_result_t ret)
3580
{
3581 3582
	switch (ret) {
	case GRO_NORMAL:
3583
	case GRO_HELD:
3584
		skb->protocol = eth_type_trans(skb, skb->dev);
3585

3586 3587 3588 3589
		if (ret == GRO_HELD)
			skb_gro_pull(skb, -ETH_HLEN);
		else if (netif_receive_skb(skb))
			ret = GRO_DROP;
3590
		break;
H
Herbert Xu 已提交
3591

3592 3593 3594 3595
	case GRO_DROP:
	case GRO_MERGED_FREE:
		napi_reuse_skb(napi, skb);
		break;
3596 3597 3598

	case GRO_MERGED:
		break;
3599
	}
H
Herbert Xu 已提交
3600

3601
	return ret;
H
Herbert Xu 已提交
3602
}
3603 3604
EXPORT_SYMBOL(napi_frags_finish);

3605 3606 3607 3608
struct sk_buff *napi_frags_skb(struct napi_struct *napi)
{
	struct sk_buff *skb = napi->skb;
	struct ethhdr *eth;
3609 3610
	unsigned int hlen;
	unsigned int off;
3611 3612 3613 3614 3615 3616

	napi->skb = NULL;

	skb_reset_mac_header(skb);
	skb_gro_reset_offset(skb);

3617 3618 3619 3620 3621 3622 3623 3624 3625 3626
	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;
		}
3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641
	}

	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);

3642
gro_result_t napi_gro_frags(struct napi_struct *napi)
3643
{
3644
	struct sk_buff *skb = napi_frags_skb(napi);
3645 3646

	if (!skb)
3647
		return GRO_DROP;
3648 3649 3650

	return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
}
H
Herbert Xu 已提交
3651 3652
EXPORT_SYMBOL(napi_gro_frags);

3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680
/*
 * 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();
}

3681
static int process_backlog(struct napi_struct *napi, int quota)
L
Linus Torvalds 已提交
3682 3683
{
	int work = 0;
E
Eric Dumazet 已提交
3684
	struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
L
Linus Torvalds 已提交
3685

3686 3687 3688 3689 3690 3691 3692 3693 3694
#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
3695
	napi->weight = weight_p;
3696 3697
	local_irq_disable();
	while (work < quota) {
L
Linus Torvalds 已提交
3698
		struct sk_buff *skb;
3699 3700 3701 3702 3703 3704
		unsigned int qlen;

		while ((skb = __skb_dequeue(&sd->process_queue))) {
			local_irq_enable();
			__netif_receive_skb(skb);
			local_irq_disable();
3705 3706 3707 3708 3709
			input_queue_head_incr(sd);
			if (++work >= quota) {
				local_irq_enable();
				return work;
			}
3710
		}
L
Linus Torvalds 已提交
3711

E
Eric Dumazet 已提交
3712
		rps_lock(sd);
3713
		qlen = skb_queue_len(&sd->input_pkt_queue);
3714
		if (qlen)
3715 3716
			skb_queue_splice_tail_init(&sd->input_pkt_queue,
						   &sd->process_queue);
3717

3718
		if (qlen < quota - work) {
E
Eric Dumazet 已提交
3719 3720 3721 3722 3723 3724 3725 3726 3727 3728
			/*
			 * 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;

3729
			quota = work + qlen;
3730
		}
E
Eric Dumazet 已提交
3731
		rps_unlock(sd);
3732 3733
	}
	local_irq_enable();
L
Linus Torvalds 已提交
3734

3735 3736
	return work;
}
L
Linus Torvalds 已提交
3737

3738 3739
/**
 * __napi_schedule - schedule for receive
3740
 * @n: entry to schedule
3741 3742 3743
 *
 * The entry's receive function will be scheduled to run
 */
H
Harvey Harrison 已提交
3744
void __napi_schedule(struct napi_struct *n)
3745 3746
{
	unsigned long flags;
L
Linus Torvalds 已提交
3747

3748
	local_irq_save(flags);
E
Eric Dumazet 已提交
3749
	____napi_schedule(&__get_cpu_var(softnet_data), n);
3750
	local_irq_restore(flags);
L
Linus Torvalds 已提交
3751
}
3752 3753
EXPORT_SYMBOL(__napi_schedule);

3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786
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);
3787
	napi->gro_count = 0;
3788
	napi->gro_list = NULL;
H
Herbert Xu 已提交
3789
	napi->skb = NULL;
3790 3791 3792 3793
	napi->poll = poll;
	napi->weight = weight;
	list_add(&napi->dev_list, &dev->napi_list);
	napi->dev = dev;
H
Herbert Xu 已提交
3794
#ifdef CONFIG_NETPOLL
3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805
	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;

3806
	list_del_init(&napi->dev_list);
3807
	napi_free_frags(napi);
3808 3809 3810 3811 3812 3813 3814 3815

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

	napi->gro_list = NULL;
3816
	napi->gro_count = 0;
3817 3818 3819
}
EXPORT_SYMBOL(netif_napi_del);

L
Linus Torvalds 已提交
3820 3821
static void net_rx_action(struct softirq_action *h)
{
3822
	struct softnet_data *sd = &__get_cpu_var(softnet_data);
3823
	unsigned long time_limit = jiffies + 2;
3824
	int budget = netdev_budget;
3825 3826
	void *have;

L
Linus Torvalds 已提交
3827 3828
	local_irq_disable();

3829
	while (!list_empty(&sd->poll_list)) {
3830 3831
		struct napi_struct *n;
		int work, weight;
L
Linus Torvalds 已提交
3832

3833
		/* If softirq window is exhuasted then punt.
3834 3835
		 * Allow this to run for 2 jiffies since which will allow
		 * an average latency of 1.5/HZ.
3836
		 */
3837
		if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
L
Linus Torvalds 已提交
3838 3839 3840 3841
			goto softnet_break;

		local_irq_enable();

3842 3843 3844 3845 3846
		/* 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.
		 */
3847
		n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
L
Linus Torvalds 已提交
3848

3849 3850 3851 3852
		have = netpoll_poll_lock(n);

		weight = n->weight;

3853 3854 3855 3856
		/* 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
L
Lucas De Marchi 已提交
3857
		 * accidentally calling ->poll() when NAPI is not scheduled.
3858 3859
		 */
		work = 0;
3860
		if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3861
			work = n->poll(n, weight);
3862 3863
			trace_napi_poll(n);
		}
3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875

		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.
		 */
3876
		if (unlikely(work == weight)) {
3877 3878 3879 3880 3881
			if (unlikely(napi_disable_pending(n))) {
				local_irq_enable();
				napi_complete(n);
				local_irq_disable();
			} else
3882
				list_move_tail(&n->poll_list, &sd->poll_list);
3883
		}
3884 3885

		netpoll_poll_unlock(have);
L
Linus Torvalds 已提交
3886 3887
	}
out:
3888
	net_rps_action_and_irq_enable(sd);
T
Tom Herbert 已提交
3889

3890 3891 3892 3893 3894
#ifdef CONFIG_NET_DMA
	/*
	 * There may not be any more sk_buffs coming right now, so push
	 * any pending DMA copies to hardware
	 */
3895
	dma_issue_pending_all();
3896
#endif
3897

L
Linus Torvalds 已提交
3898 3899 3900
	return;

softnet_break:
C
Changli Gao 已提交
3901
	sd->time_squeeze++;
L
Linus Torvalds 已提交
3902 3903 3904 3905
	__raise_softirq_irqoff(NET_RX_SOFTIRQ);
	goto out;
}

E
Eric Dumazet 已提交
3906
static gifconf_func_t *gifconf_list[NPROTO];
L
Linus Torvalds 已提交
3907 3908 3909 3910 3911 3912 3913 3914 3915 3916

/**
 *	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
3917
int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
L
Linus Torvalds 已提交
3918 3919 3920 3921 3922 3923
{
	if (family >= NPROTO)
		return -EINVAL;
	gifconf_list[family] = gifconf;
	return 0;
}
E
Eric Dumazet 已提交
3924
EXPORT_SYMBOL(register_gifconf);
L
Linus Torvalds 已提交
3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937


/*
 *	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
 */

3938
static int dev_ifname(struct net *net, struct ifreq __user *arg)
L
Linus Torvalds 已提交
3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949
{
	struct net_device *dev;
	struct ifreq ifr;

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

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

3950 3951
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
L
Linus Torvalds 已提交
3952
	if (!dev) {
3953
		rcu_read_unlock();
L
Linus Torvalds 已提交
3954 3955 3956 3957
		return -ENODEV;
	}

	strcpy(ifr.ifr_name, dev->name);
3958
	rcu_read_unlock();
L
Linus Torvalds 已提交
3959 3960 3961 3962 3963 3964 3965 3966 3967 3968 3969 3970

	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'.
 */

3971
static int dev_ifconf(struct net *net, char __user *arg)
L
Linus Torvalds 已提交
3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994
{
	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;
3995
	for_each_netdev(net, dev) {
L
Linus Torvalds 已提交
3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008
		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;
			}
		}
4009
	}
L
Linus Torvalds 已提交
4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022

	/*
	 *	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
4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076

#define BUCKET_SPACE (32 - NETDEV_HASHBITS)

struct dev_iter_state {
	struct seq_net_private p;
	unsigned int pos; /* bucket << BUCKET_SPACE + offset */
};

#define get_bucket(x) ((x) >> BUCKET_SPACE)
#define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
#define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))

static inline struct net_device *dev_from_same_bucket(struct seq_file *seq)
{
	struct dev_iter_state *state = seq->private;
	struct net *net = seq_file_net(seq);
	struct net_device *dev;
	struct hlist_node *p;
	struct hlist_head *h;
	unsigned int count, bucket, offset;

	bucket = get_bucket(state->pos);
	offset = get_offset(state->pos);
	h = &net->dev_name_head[bucket];
	count = 0;
	hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
		if (count++ == offset) {
			state->pos = set_bucket_offset(bucket, count);
			return dev;
		}
	}

	return NULL;
}

static inline struct net_device *dev_from_new_bucket(struct seq_file *seq)
{
	struct dev_iter_state *state = seq->private;
	struct net_device *dev;
	unsigned int bucket;

	bucket = get_bucket(state->pos);
	do {
		dev = dev_from_same_bucket(seq);
		if (dev)
			return dev;

		bucket++;
		state->pos = set_bucket_offset(bucket, 0);
	} while (bucket < NETDEV_HASHENTRIES);

	return NULL;
}

L
Linus Torvalds 已提交
4077 4078 4079 4080
/*
 *	This is invoked by the /proc filesystem handler to display a device
 *	in detail.
 */
4081
void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4082
	__acquires(RCU)
L
Linus Torvalds 已提交
4083
{
4084
	struct dev_iter_state *state = seq->private;
L
Linus Torvalds 已提交
4085

4086
	rcu_read_lock();
4087 4088
	if (!*pos)
		return SEQ_START_TOKEN;
L
Linus Torvalds 已提交
4089

4090 4091 4092
	/* check for end of the hash */
	if (state->pos == 0 && *pos > 1)
		return NULL;
L
Linus Torvalds 已提交
4093

4094
	return dev_from_new_bucket(seq);
L
Linus Torvalds 已提交
4095 4096 4097 4098
}

void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
4099 4100 4101
	struct net_device *dev;

	++*pos;
E
Eric Dumazet 已提交
4102 4103

	if (v == SEQ_START_TOKEN)
4104
		return dev_from_new_bucket(seq);
4105

4106 4107 4108 4109 4110
	dev = dev_from_same_bucket(seq);
	if (dev)
		return dev;

	return dev_from_new_bucket(seq);
L
Linus Torvalds 已提交
4111 4112 4113
}

void dev_seq_stop(struct seq_file *seq, void *v)
4114
	__releases(RCU)
L
Linus Torvalds 已提交
4115
{
4116
	rcu_read_unlock();
L
Linus Torvalds 已提交
4117 4118 4119 4120
}

static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
4121 4122
	struct rtnl_link_stats64 temp;
	const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
L
Linus Torvalds 已提交
4123

4124 4125
	seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
		   "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140
		   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
4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159
}

/*
 *	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
4160
static struct softnet_data *softnet_get_online(loff_t *pos)
L
Linus Torvalds 已提交
4161
{
C
Changli Gao 已提交
4162
	struct softnet_data *sd = NULL;
L
Linus Torvalds 已提交
4163

4164
	while (*pos < nr_cpu_ids)
4165
		if (cpu_online(*pos)) {
C
Changli Gao 已提交
4166
			sd = &per_cpu(softnet_data, *pos);
L
Linus Torvalds 已提交
4167 4168 4169
			break;
		} else
			++*pos;
C
Changli Gao 已提交
4170
	return sd;
L
Linus Torvalds 已提交
4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189
}

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
4190
	struct softnet_data *sd = v;
L
Linus Torvalds 已提交
4191

T
Tom Herbert 已提交
4192
	seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
C
Changli Gao 已提交
4193
		   sd->processed, sd->dropped, sd->time_squeeze, 0,
4194
		   0, 0, 0, 0, /* was fastroute */
C
Changli Gao 已提交
4195
		   sd->cpu_collision, sd->received_rps);
L
Linus Torvalds 已提交
4196 4197 4198
	return 0;
}

4199
static const struct seq_operations dev_seq_ops = {
L
Linus Torvalds 已提交
4200 4201 4202 4203 4204 4205 4206 4207
	.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)
{
4208
	return seq_open_net(inode, file, &dev_seq_ops,
4209
			    sizeof(struct dev_iter_state));
L
Linus Torvalds 已提交
4210 4211
}

4212
static const struct file_operations dev_seq_fops = {
L
Linus Torvalds 已提交
4213 4214 4215 4216
	.owner	 = THIS_MODULE,
	.open    = dev_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
4217
	.release = seq_release_net,
L
Linus Torvalds 已提交
4218 4219
};

4220
static const struct seq_operations softnet_seq_ops = {
L
Linus Torvalds 已提交
4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231
	.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);
}

4232
static const struct file_operations softnet_seq_fops = {
L
Linus Torvalds 已提交
4233 4234 4235 4236 4237 4238 4239
	.owner	 = THIS_MODULE,
	.open    = softnet_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release,
};

4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251
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;
	}

4252
	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4253 4254 4255 4256 4257 4258 4259 4260 4261 4262
		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)
4263
	__acquires(RCU)
4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286
{
	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
4287
		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4288 4289

	while (nxt == &ptype_base[hash]) {
4290
		if (++hash >= PTYPE_HASH_SIZE)
4291 4292 4293 4294 4295 4296 4297 4298
			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)
4299
	__releases(RCU)
4300 4301 4302 4303 4304 4305 4306 4307 4308 4309
{
	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");
4310
	else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4311 4312 4313 4314 4315
		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
4316 4317
		seq_printf(seq, " %-8s %pF\n",
			   pt->dev ? pt->dev->name : "", pt->func);
4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331
	}

	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)
{
4332 4333
	return seq_open_net(inode, file, &ptype_seq_ops,
			sizeof(struct seq_net_private));
4334 4335 4336 4337 4338 4339 4340
}

static const struct file_operations ptype_seq_fops = {
	.owner	 = THIS_MODULE,
	.open    = ptype_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
4341
	.release = seq_release_net,
4342 4343 4344
};


4345
static int __net_init dev_proc_net_init(struct net *net)
L
Linus Torvalds 已提交
4346 4347 4348
{
	int rc = -ENOMEM;

4349
	if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
L
Linus Torvalds 已提交
4350
		goto out;
4351
	if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
L
Linus Torvalds 已提交
4352
		goto out_dev;
4353
	if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4354
		goto out_softnet;
4355

4356
	if (wext_proc_init(net))
4357
		goto out_ptype;
L
Linus Torvalds 已提交
4358 4359 4360
	rc = 0;
out:
	return rc;
4361
out_ptype:
4362
	proc_net_remove(net, "ptype");
L
Linus Torvalds 已提交
4363
out_softnet:
4364
	proc_net_remove(net, "softnet_stat");
L
Linus Torvalds 已提交
4365
out_dev:
4366
	proc_net_remove(net, "dev");
L
Linus Torvalds 已提交
4367 4368
	goto out;
}
4369

4370
static void __net_exit dev_proc_net_exit(struct net *net)
4371 4372 4373 4374 4375 4376 4377 4378
{
	wext_proc_exit(net);

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

4379
static struct pernet_operations __net_initdata dev_proc_ops = {
4380 4381 4382 4383 4384 4385 4386 4387
	.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
4388 4389 4390 4391 4392 4393
#else
#define dev_proc_init() 0
#endif	/* CONFIG_PROC_FS */


/**
J
Jiri Pirko 已提交
4394
 *	netdev_set_master	-	set up master pointer
L
Linus Torvalds 已提交
4395 4396 4397 4398 4399 4400
 *	@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
4401
 *	are adjusted and the function returns zero.
L
Linus Torvalds 已提交
4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415
 */
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;
4416

4417
	if (old)
L
Linus Torvalds 已提交
4418
		dev_put(old);
J
Jiri Pirko 已提交
4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441
	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
4442 4443 4444 4445 4446 4447 4448 4449
	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
4450
EXPORT_SYMBOL(netdev_set_bond_master);
L
Linus Torvalds 已提交
4451

4452 4453
static void dev_change_rx_flags(struct net_device *dev, int flags)
{
4454 4455 4456 4457
	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);
4458 4459
}

4460
static int __dev_set_promiscuity(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
4461 4462
{
	unsigned short old_flags = dev->flags;
4463 4464
	uid_t uid;
	gid_t gid;
L
Linus Torvalds 已提交
4465

4466 4467
	ASSERT_RTNL();

4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484
	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;
		}
	}
4485
	if (dev->flags != old_flags) {
L
Linus Torvalds 已提交
4486 4487
		printk(KERN_INFO "device %s %s promiscuous mode\n",
		       dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4488
							       "left");
4489 4490
		if (audit_enabled) {
			current_uid_gid(&uid, &gid);
4491 4492 4493 4494 4495 4496
			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),
4497
				uid, gid,
4498
				audit_get_sessionid(current));
4499
		}
4500

4501
		dev_change_rx_flags(dev, IFF_PROMISC);
L
Linus Torvalds 已提交
4502
	}
4503
	return 0;
L
Linus Torvalds 已提交
4504 4505
}

4506 4507 4508 4509 4510 4511 4512 4513 4514
/**
 *	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.
4515
 *	Return 0 if successful or a negative errno code on error.
4516
 */
4517
int dev_set_promiscuity(struct net_device *dev, int inc)
4518 4519
{
	unsigned short old_flags = dev->flags;
4520
	int err;
4521

4522
	err = __dev_set_promiscuity(dev, inc);
4523
	if (err < 0)
4524
		return err;
4525 4526
	if (dev->flags != old_flags)
		dev_set_rx_mode(dev);
4527
	return err;
4528
}
E
Eric Dumazet 已提交
4529
EXPORT_SYMBOL(dev_set_promiscuity);
4530

L
Linus Torvalds 已提交
4531 4532 4533 4534 4535 4536 4537 4538 4539 4540
/**
 *	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.
4541
 *	Return 0 if successful or a negative errno code on error.
L
Linus Torvalds 已提交
4542 4543
 */

4544
int dev_set_allmulti(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
4545 4546 4547
{
	unsigned short old_flags = dev->flags;

4548 4549
	ASSERT_RTNL();

L
Linus Torvalds 已提交
4550
	dev->flags |= IFF_ALLMULTI;
4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566
	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;
		}
	}
4567
	if (dev->flags ^ old_flags) {
4568
		dev_change_rx_flags(dev, IFF_ALLMULTI);
4569
		dev_set_rx_mode(dev);
4570
	}
4571
	return 0;
4572
}
E
Eric Dumazet 已提交
4573
EXPORT_SYMBOL(dev_set_allmulti);
4574 4575 4576 4577

/*
 *	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
4578
 *	filtering it is put in promiscuous mode while unicast addresses
4579 4580 4581 4582
 *	are present.
 */
void __dev_set_rx_mode(struct net_device *dev)
{
4583 4584
	const struct net_device_ops *ops = dev->netdev_ops;

4585 4586 4587 4588 4589
	/* dev_open will call this function so the list will stay sane. */
	if (!(dev->flags&IFF_UP))
		return;

	if (!netif_device_present(dev))
4590
		return;
4591

4592
	if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
4593 4594 4595
		/* Unicast addresses changes may only happen under the rtnl,
		 * therefore calling __dev_set_promiscuity here is safe.
		 */
4596
		if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4597
			__dev_set_promiscuity(dev, 1);
4598
			dev->uc_promisc = true;
4599
		} else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4600
			__dev_set_promiscuity(dev, -1);
4601
			dev->uc_promisc = false;
4602 4603
		}
	}
4604 4605 4606

	if (ops->ndo_set_rx_mode)
		ops->ndo_set_rx_mode(dev);
4607 4608 4609 4610
}

void dev_set_rx_mode(struct net_device *dev)
{
4611
	netif_addr_lock_bh(dev);
4612
	__dev_set_rx_mode(dev);
4613
	netif_addr_unlock_bh(dev);
L
Linus Torvalds 已提交
4614 4615
}

4616 4617 4618 4619 4620 4621
/**
 *	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
4622 4623 4624 4625 4626 4627
unsigned dev_get_flags(const struct net_device *dev)
{
	unsigned flags;

	flags = (dev->flags & ~(IFF_PROMISC |
				IFF_ALLMULTI |
S
Stefan Rompf 已提交
4628 4629 4630
				IFF_RUNNING |
				IFF_LOWER_UP |
				IFF_DORMANT)) |
L
Linus Torvalds 已提交
4631 4632 4633
		(dev->gflags & (IFF_PROMISC |
				IFF_ALLMULTI));

S
Stefan Rompf 已提交
4634 4635 4636 4637 4638 4639 4640 4641
	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
4642 4643 4644

	return flags;
}
E
Eric Dumazet 已提交
4645
EXPORT_SYMBOL(dev_get_flags);
L
Linus Torvalds 已提交
4646

4647
int __dev_change_flags(struct net_device *dev, unsigned int flags)
L
Linus Torvalds 已提交
4648 4649
{
	int old_flags = dev->flags;
4650
	int ret;
L
Linus Torvalds 已提交
4651

4652 4653
	ASSERT_RTNL();

L
Linus Torvalds 已提交
4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667
	/*
	 *	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.
	 */

4668 4669
	if ((old_flags ^ flags) & IFF_MULTICAST)
		dev_change_rx_flags(dev, IFF_MULTICAST);
4670

4671
	dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
4672 4673 4674 4675 4676 4677 4678 4679 4680

	/*
	 *	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  ? */
4681
		ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
L
Linus Torvalds 已提交
4682 4683

		if (!ret)
4684
			dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
4685 4686 4687
	}

	if ((flags ^ dev->gflags) & IFF_PROMISC) {
E
Eric Dumazet 已提交
4688 4689
		int inc = (flags & IFF_PROMISC) ? 1 : -1;

L
Linus Torvalds 已提交
4690 4691 4692 4693 4694 4695 4696 4697 4698
		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
4699 4700
		int inc = (flags & IFF_ALLMULTI) ? 1 : -1;

L
Linus Torvalds 已提交
4701 4702 4703 4704
		dev->gflags ^= IFF_ALLMULTI;
		dev_set_allmulti(dev, inc);
	}

4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735 4736 4737 4738 4739 4740 4741
	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;
4742 4743
	if (changes)
		rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
L
Linus Torvalds 已提交
4744

4745
	__dev_notify_flags(dev, old_flags);
L
Linus Torvalds 已提交
4746 4747
	return ret;
}
E
Eric Dumazet 已提交
4748
EXPORT_SYMBOL(dev_change_flags);
L
Linus Torvalds 已提交
4749

4750 4751 4752 4753 4754 4755 4756
/**
 *	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
4757 4758
int dev_set_mtu(struct net_device *dev, int new_mtu)
{
4759
	const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772
	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;
4773 4774
	if (ops->ndo_change_mtu)
		err = ops->ndo_change_mtu(dev, new_mtu);
L
Linus Torvalds 已提交
4775 4776
	else
		dev->mtu = new_mtu;
4777

L
Linus Torvalds 已提交
4778
	if (!err && dev->flags & IFF_UP)
4779
		call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
L
Linus Torvalds 已提交
4780 4781
	return err;
}
E
Eric Dumazet 已提交
4782
EXPORT_SYMBOL(dev_set_mtu);
L
Linus Torvalds 已提交
4783

4784 4785 4786 4787 4788 4789 4790 4791 4792 4793 4794
/**
 *	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);

4795 4796 4797 4798 4799 4800 4801
/**
 *	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
4802 4803
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
{
4804
	const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
4805 4806
	int err;

4807
	if (!ops->ndo_set_mac_address)
L
Linus Torvalds 已提交
4808 4809 4810 4811 4812
		return -EOPNOTSUPP;
	if (sa->sa_family != dev->type)
		return -EINVAL;
	if (!netif_device_present(dev))
		return -ENODEV;
4813
	err = ops->ndo_set_mac_address(dev, sa);
L
Linus Torvalds 已提交
4814
	if (!err)
4815
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
L
Linus Torvalds 已提交
4816 4817
	return err;
}
E
Eric Dumazet 已提交
4818
EXPORT_SYMBOL(dev_set_mac_address);
L
Linus Torvalds 已提交
4819 4820

/*
E
Eric Dumazet 已提交
4821
 *	Perform the SIOCxIFxxx calls, inside rcu_read_lock()
L
Linus Torvalds 已提交
4822
 */
4823
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
L
Linus Torvalds 已提交
4824 4825
{
	int err;
E
Eric Dumazet 已提交
4826
	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
L
Linus Torvalds 已提交
4827 4828 4829 4830 4831

	if (!dev)
		return -ENODEV;

	switch (cmd) {
E
Eric Dumazet 已提交
4832 4833 4834
	case SIOCGIFFLAGS:	/* Get interface flags */
		ifr->ifr_flags = (short) dev_get_flags(dev);
		return 0;
L
Linus Torvalds 已提交
4835

E
Eric Dumazet 已提交
4836 4837 4838 4839
	case SIOCGIFMETRIC:	/* Get the metric on the interface
				   (currently unused) */
		ifr->ifr_metric = 0;
		return 0;
L
Linus Torvalds 已提交
4840

E
Eric Dumazet 已提交
4841 4842 4843
	case SIOCGIFMTU:	/* Get the MTU of a device */
		ifr->ifr_mtu = dev->mtu;
		return 0;
L
Linus Torvalds 已提交
4844

E
Eric Dumazet 已提交
4845 4846 4847 4848 4849 4850 4851 4852
	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
4853

E
Eric Dumazet 已提交
4854 4855 4856
	case SIOCGIFSLAVE:
		err = -EINVAL;
		break;
4857

E
Eric Dumazet 已提交
4858 4859 4860 4861 4862 4863 4864 4865
	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;
4866

E
Eric Dumazet 已提交
4867 4868 4869
	case SIOCGIFINDEX:
		ifr->ifr_ifindex = dev->ifindex;
		return 0;
4870

E
Eric Dumazet 已提交
4871 4872 4873
	case SIOCGIFTXQLEN:
		ifr->ifr_qlen = dev->tx_queue_len;
		return 0;
4874

E
Eric Dumazet 已提交
4875 4876 4877 4878 4879
	default:
		/* dev_ioctl() should ensure this case
		 * is never reached
		 */
		WARN_ON(1);
4880
		err = -ENOTTY;
E
Eric Dumazet 已提交
4881
		break;
4882 4883 4884 4885 4886 4887 4888 4889 4890 4891 4892 4893

	}
	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
4894
	const struct net_device_ops *ops;
4895 4896 4897 4898

	if (!dev)
		return -ENODEV;

J
Jarek Poplawski 已提交
4899 4900
	ops = dev->netdev_ops;

4901
	switch (cmd) {
E
Eric Dumazet 已提交
4902 4903
	case SIOCSIFFLAGS:	/* Set interface flags */
		return dev_change_flags(dev, ifr->ifr_flags);
4904

E
Eric Dumazet 已提交
4905 4906 4907
	case SIOCSIFMETRIC:	/* Set the metric on the interface
				   (currently unused) */
		return -EOPNOTSUPP;
4908

E
Eric Dumazet 已提交
4909 4910
	case SIOCSIFMTU:	/* Set the MTU of a device */
		return dev_set_mtu(dev, ifr->ifr_mtu);
L
Linus Torvalds 已提交
4911

E
Eric Dumazet 已提交
4912 4913
	case SIOCSIFHWADDR:
		return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
L
Linus Torvalds 已提交
4914

E
Eric Dumazet 已提交
4915 4916 4917 4918 4919 4920 4921
	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
4922

E
Eric Dumazet 已提交
4923 4924
	case SIOCSIFMAP:
		if (ops->ndo_set_config) {
L
Linus Torvalds 已提交
4925 4926
			if (!netif_device_present(dev))
				return -ENODEV;
E
Eric Dumazet 已提交
4927 4928 4929
			return ops->ndo_set_config(dev, &ifr->ifr_map);
		}
		return -EOPNOTSUPP;
L
Linus Torvalds 已提交
4930

E
Eric Dumazet 已提交
4931
	case SIOCADDMULTI:
4932
		if (!ops->ndo_set_rx_mode ||
E
Eric Dumazet 已提交
4933 4934 4935 4936
		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
			return -EINVAL;
		if (!netif_device_present(dev))
			return -ENODEV;
4937
		return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
E
Eric Dumazet 已提交
4938 4939

	case SIOCDELMULTI:
4940
		if (!ops->ndo_set_rx_mode ||
E
Eric Dumazet 已提交
4941 4942 4943 4944
		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
			return -EINVAL;
		if (!netif_device_present(dev))
			return -ENODEV;
4945
		return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
L
Linus Torvalds 已提交
4946

E
Eric Dumazet 已提交
4947 4948 4949 4950 4951
	case SIOCSIFTXQLEN:
		if (ifr->ifr_qlen < 0)
			return -EINVAL;
		dev->tx_queue_len = ifr->ifr_qlen;
		return 0;
L
Linus Torvalds 已提交
4952

E
Eric Dumazet 已提交
4953 4954 4955
	case SIOCSIFNAME:
		ifr->ifr_newname[IFNAMSIZ-1] = '\0';
		return dev_change_name(dev, ifr->ifr_newname);
L
Linus Torvalds 已提交
4956

4957 4958 4959 4960 4961 4962
	case SIOCSHWTSTAMP:
		err = net_hwtstamp_validate(ifr);
		if (err)
			return err;
		/* fall through */

E
Eric Dumazet 已提交
4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988 4989 4990
	/*
	 *	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
4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002

	}
	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
5003
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
5004 5005 5006 5007 5008 5009 5010 5011 5012
 *	@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.
 */

5013
int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
L
Linus Torvalds 已提交
5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024
{
	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) {
5025
		rtnl_lock();
5026
		ret = dev_ifconf(net, (char __user *) arg);
5027
		rtnl_unlock();
L
Linus Torvalds 已提交
5028 5029 5030
		return ret;
	}
	if (cmd == SIOCGIFNAME)
5031
		return dev_ifname(net, (struct ifreq __user *)arg);
L
Linus Torvalds 已提交
5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046

	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
5047 5048 5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060 5061
	/*
	 *	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
5062
		rcu_read_lock();
E
Eric Dumazet 已提交
5063
		ret = dev_ifsioc_locked(net, &ifr, cmd);
E
Eric Dumazet 已提交
5064
		rcu_read_unlock();
E
Eric Dumazet 已提交
5065 5066 5067 5068 5069 5070 5071 5072
		if (!ret) {
			if (colon)
				*colon = ':';
			if (copy_to_user(arg, &ifr,
					 sizeof(struct ifreq)))
				ret = -EFAULT;
		}
		return ret;
L
Linus Torvalds 已提交
5073

E
Eric Dumazet 已提交
5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086
	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
5087

E
Eric Dumazet 已提交
5088 5089 5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104 5105 5106 5107 5108 5109 5110
	/*
	 *	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
5111

E
Eric Dumazet 已提交
5112 5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153
	/*
	 *	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:
5154
		return -ENOTTY;
E
Eric Dumazet 已提交
5155 5156 5157 5158 5159 5160 5161 5162

	/*
	 *	Unknown or private ioctl.
	 */
	default:
		if (cmd == SIOCWANDEV ||
		    (cmd >= SIOCDEVPRIVATE &&
		     cmd <= SIOCDEVPRIVATE + 15)) {
5163
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
5164
			rtnl_lock();
5165
			ret = dev_ifsioc(net, &ifr, cmd);
L
Linus Torvalds 已提交
5166
			rtnl_unlock();
E
Eric Dumazet 已提交
5167 5168 5169
			if (!ret && copy_to_user(arg, &ifr,
						 sizeof(struct ifreq)))
				ret = -EFAULT;
L
Linus Torvalds 已提交
5170
			return ret;
E
Eric Dumazet 已提交
5171 5172 5173 5174
		}
		/* Take care of Wireless Extensions */
		if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
			return wext_handle_ioctl(net, &ifr, cmd, arg);
5175
		return -ENOTTY;
L
Linus Torvalds 已提交
5176 5177 5178 5179 5180 5181
	}
}


/**
 *	dev_new_index	-	allocate an ifindex
5182
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
5183 5184 5185 5186 5187
 *
 *	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.
 */
5188
static int dev_new_index(struct net *net)
L
Linus Torvalds 已提交
5189 5190 5191 5192 5193
{
	static int ifindex;
	for (;;) {
		if (++ifindex <= 0)
			ifindex = 1;
5194
		if (!__dev_get_by_index(net, ifindex))
L
Linus Torvalds 已提交
5195 5196 5197 5198 5199
			return ifindex;
	}
}

/* Delayed registration/unregisteration */
5200
static LIST_HEAD(net_todo_list);
L
Linus Torvalds 已提交
5201

5202
static void net_set_todo(struct net_device *dev)
L
Linus Torvalds 已提交
5203 5204 5205 5206
{
	list_add_tail(&dev->todo_list, &net_todo_list);
}

5207
static void rollback_registered_many(struct list_head *head)
5208
{
5209
	struct net_device *dev, *tmp;
5210

5211 5212 5213
	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

5214
	list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5215
		/* Some devices call without registering
5216 5217
		 * for initialization unwind. Remove those
		 * devices and proceed with the remaining.
5218 5219 5220 5221
		 */
		if (dev->reg_state == NETREG_UNINITIALIZED) {
			pr_debug("unregister_netdevice: device %s/%p never "
				 "was registered\n", dev->name, dev);
5222

5223
			WARN_ON(1);
5224 5225
			list_del(&dev->unreg_list);
			continue;
5226
		}
5227
		dev->dismantle = true;
5228
		BUG_ON(dev->reg_state != NETREG_REGISTERED);
5229
	}
5230

5231 5232
	/* If device is running, close it first. */
	dev_close_many(head);
5233

5234
	list_for_each_entry(dev, head, unreg_list) {
5235 5236
		/* And unlink it from device chain. */
		unlist_netdevice(dev);
5237

5238 5239
		dev->reg_state = NETREG_UNREGISTERING;
	}
5240 5241 5242

	synchronize_net();

5243 5244 5245
	list_for_each_entry(dev, head, unreg_list) {
		/* Shutdown queueing discipline. */
		dev_shutdown(dev);
5246 5247


5248 5249 5250 5251
		/* Notify protocols, that we are about to destroy
		   this device. They should clean all the things.
		*/
		call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5252

5253 5254 5255 5256
		if (!dev->rtnl_link_ops ||
		    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
			rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);

5257 5258 5259
		/*
		 *	Flush the unicast and multicast chains
		 */
5260
		dev_uc_flush(dev);
5261
		dev_mc_flush(dev);
5262

5263 5264
		if (dev->netdev_ops->ndo_uninit)
			dev->netdev_ops->ndo_uninit(dev);
5265

5266 5267
		/* Notifier chain MUST detach us from master device. */
		WARN_ON(dev->master);
5268

5269 5270 5271
		/* Remove entries from kobject tree */
		netdev_unregister_kobject(dev);
	}
5272

5273
	/* Process any work delayed until the end of the batch */
5274
	dev = list_first_entry(head, struct net_device, unreg_list);
5275
	call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5276

5277
	synchronize_net();
5278

5279
	list_for_each_entry(dev, head, unreg_list)
5280 5281 5282 5283 5284 5285 5286 5287 5288
		dev_put(dev);
}

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

	list_add(&dev->unreg_list, &single);
	rollback_registered_many(&single);
E
Eric Dumazet 已提交
5289
	list_del(&single);
5290 5291
}

5292 5293
static netdev_features_t netdev_fix_features(struct net_device *dev,
	netdev_features_t features)
5294
{
5295 5296 5297
	/* Fix illegal checksum combinations */
	if ((features & NETIF_F_HW_CSUM) &&
	    (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5298
		netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5299 5300 5301
		features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
	}

5302 5303 5304
	/* Fix illegal SG+CSUM combinations. */
	if ((features & NETIF_F_SG) &&
	    !(features & NETIF_F_ALL_CSUM)) {
5305 5306
		netdev_dbg(dev,
			"Dropping NETIF_F_SG since no checksum feature.\n");
5307 5308 5309 5310
		features &= ~NETIF_F_SG;
	}

	/* TSO requires that SG is present as well. */
5311
	if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5312
		netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5313
		features &= ~NETIF_F_ALL_TSO;
5314 5315
	}

5316 5317 5318 5319
	/* TSO ECN requires that TSO is present as well. */
	if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
		features &= ~NETIF_F_TSO_ECN;

5320 5321
	/* Software GSO depends on SG. */
	if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5322
		netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5323 5324 5325
		features &= ~NETIF_F_GSO;
	}

5326
	/* UFO needs SG and checksumming */
5327
	if (features & NETIF_F_UFO) {
5328 5329 5330 5331
		/* 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))) {
5332
			netdev_dbg(dev,
5333
				"Dropping NETIF_F_UFO since no checksum offload features.\n");
5334 5335 5336 5337
			features &= ~NETIF_F_UFO;
		}

		if (!(features & NETIF_F_SG)) {
5338
			netdev_dbg(dev,
5339
				"Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5340 5341 5342 5343 5344 5345 5346
			features &= ~NETIF_F_UFO;
		}
	}

	return features;
}

5347
int __netdev_update_features(struct net_device *dev)
5348
{
5349
	netdev_features_t features;
5350 5351
	int err = 0;

5352 5353
	ASSERT_RTNL();

5354 5355 5356 5357 5358 5359 5360 5361 5362
	features = netdev_get_wanted_features(dev);

	if (dev->netdev_ops->ndo_fix_features)
		features = dev->netdev_ops->ndo_fix_features(dev, features);

	/* driver might be less strict about feature dependencies */
	features = netdev_fix_features(dev, features);

	if (dev->features == features)
5363
		return 0;
5364

5365 5366
	netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
		&dev->features, &features);
5367 5368 5369 5370

	if (dev->netdev_ops->ndo_set_features)
		err = dev->netdev_ops->ndo_set_features(dev, features);

5371
	if (unlikely(err < 0)) {
5372
		netdev_err(dev,
5373 5374
			"set_features() failed (%d); wanted %pNF, left %pNF\n",
			err, &features, &dev->features);
5375 5376 5377 5378 5379 5380 5381 5382 5383
		return -1;
	}

	if (!err)
		dev->features = features;

	return 1;
}

5384 5385 5386 5387 5388 5389 5390 5391
/**
 *	netdev_update_features - recalculate device features
 *	@dev: the device to check
 *
 *	Recalculate dev->features set and send notifications if it
 *	has changed. Should be called after driver or hardware dependent
 *	conditions might have changed that influence the features.
 */
5392 5393 5394 5395
void netdev_update_features(struct net_device *dev)
{
	if (__netdev_update_features(dev))
		netdev_features_change(dev);
5396 5397 5398
}
EXPORT_SYMBOL(netdev_update_features);

5399 5400 5401 5402 5403 5404 5405 5406 5407 5408 5409 5410 5411 5412 5413 5414 5415
/**
 *	netdev_change_features - recalculate device features
 *	@dev: the device to check
 *
 *	Recalculate dev->features set and send notifications even
 *	if they have not changed. Should be called instead of
 *	netdev_update_features() if also dev->vlan_features might
 *	have changed to allow the changes to be propagated to stacked
 *	VLAN devices.
 */
void netdev_change_features(struct net_device *dev)
{
	__netdev_update_features(dev);
	netdev_features_change(dev);
}
EXPORT_SYMBOL(netdev_change_features);

5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429 5430 5431 5432 5433 5434 5435 5436 5437 5438 5439 5440 5441 5442
/**
 *	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
5443
#ifdef CONFIG_RPS
5444 5445 5446
static int netif_alloc_rx_queues(struct net_device *dev)
{
	unsigned int i, count = dev->num_rx_queues;
T
Tom Herbert 已提交
5447
	struct netdev_rx_queue *rx;
5448

T
Tom Herbert 已提交
5449
	BUG_ON(count < 1);
5450

T
Tom Herbert 已提交
5451 5452 5453 5454
	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;
5455
	}
T
Tom Herbert 已提交
5456 5457 5458
	dev->_rx = rx;

	for (i = 0; i < count; i++)
T
Tom Herbert 已提交
5459
		rx[i].dev = dev;
5460 5461
	return 0;
}
T
Tom Herbert 已提交
5462
#endif
5463

C
Changli Gao 已提交
5464 5465 5466 5467 5468 5469 5470
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;
5471
	netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
C
Changli Gao 已提交
5472 5473 5474
	queue->dev = dev;
}

5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488
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
5489

5490 5491
	netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
	spin_lock_init(&dev->tx_global_lock);
C
Changli Gao 已提交
5492 5493

	return 0;
5494 5495
}

L
Linus Torvalds 已提交
5496 5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512 5513 5514 5515
/**
 *	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;
5516
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
5517 5518 5519 5520

	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

5521 5522
	might_sleep();

L
Linus Torvalds 已提交
5523 5524
	/* When net_device's are persistent, this will be fatal. */
	BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5525
	BUG_ON(!net);
L
Linus Torvalds 已提交
5526

5527
	spin_lock_init(&dev->addr_list_lock);
5528
	netdev_set_addr_lockdep_class(dev);
L
Linus Torvalds 已提交
5529 5530 5531

	dev->iflink = -1;

5532 5533 5534 5535
	ret = dev_get_valid_name(dev, dev->name);
	if (ret < 0)
		goto out;

L
Linus Torvalds 已提交
5536
	/* Init, if this function is available */
5537 5538
	if (dev->netdev_ops->ndo_init) {
		ret = dev->netdev_ops->ndo_init(dev);
L
Linus Torvalds 已提交
5539 5540 5541
		if (ret) {
			if (ret > 0)
				ret = -EIO;
5542
			goto out;
L
Linus Torvalds 已提交
5543 5544
		}
	}
5545

5546
	dev->ifindex = dev_new_index(net);
L
Linus Torvalds 已提交
5547 5548 5549
	if (dev->iflink == -1)
		dev->iflink = dev->ifindex;

5550 5551 5552 5553
	/* Transfer changeable features to wanted_features and enable
	 * software offloads (GSO and GRO).
	 */
	dev->hw_features |= NETIF_F_SOFT_FEATURES;
5554 5555
	dev->features |= NETIF_F_SOFT_FEATURES;
	dev->wanted_features = dev->features & dev->hw_features;
L
Linus Torvalds 已提交
5556

5557
	/* Turn on no cache copy if HW is doing checksum */
5558 5559 5560 5561 5562 5563
	if (!(dev->flags & IFF_LOOPBACK)) {
		dev->hw_features |= NETIF_F_NOCACHE_COPY;
		if (dev->features & NETIF_F_ALL_CSUM) {
			dev->wanted_features |= NETIF_F_NOCACHE_COPY;
			dev->features |= NETIF_F_NOCACHE_COPY;
		}
5564 5565
	}

5566
	/* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5567
	 */
5568
	dev->vlan_features |= NETIF_F_HIGHDMA;
5569

5570 5571 5572 5573 5574
	ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		goto err_uninit;

5575
	ret = netdev_register_kobject(dev);
5576
	if (ret)
5577
		goto err_uninit;
5578 5579
	dev->reg_state = NETREG_REGISTERED;

5580
	__netdev_update_features(dev);
5581

L
Linus Torvalds 已提交
5582 5583 5584 5585 5586 5587 5588 5589 5590
	/*
	 *	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);
5591
	list_netdevice(dev);
L
Linus Torvalds 已提交
5592 5593

	/* Notify protocols, that a new device appeared. */
5594
	ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5595
	ret = notifier_to_errno(ret);
5596 5597 5598 5599
	if (ret) {
		rollback_registered(dev);
		dev->reg_state = NETREG_UNREGISTERED;
	}
5600 5601 5602 5603
	/*
	 *	Prevent userspace races by waiting until the network
	 *	device is fully setup before sending notifications.
	 */
5604 5605 5606
	if (!dev->rtnl_link_ops ||
	    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
		rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
L
Linus Torvalds 已提交
5607 5608 5609

out:
	return ret;
5610 5611

err_uninit:
5612 5613
	if (dev->netdev_ops->ndo_uninit)
		dev->netdev_ops->ndo_uninit(dev);
5614
	goto out;
L
Linus Torvalds 已提交
5615
}
E
Eric Dumazet 已提交
5616
EXPORT_SYMBOL(register_netdevice);
L
Linus Torvalds 已提交
5617

5618 5619 5620 5621 5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637 5638 5639 5640 5641 5642 5643 5644 5645 5646 5647 5648
/**
 *	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
5649 5650 5651 5652 5653
	/* Note : We dont allocate pcpu_refcnt for dummy devices,
	 * because users of this 'device' dont need to change
	 * its refcount.
	 */

5654 5655 5656 5657 5658
	return 0;
}
EXPORT_SYMBOL_GPL(init_dummy_netdev);


L
Linus Torvalds 已提交
5659 5660 5661 5662 5663 5664 5665 5666 5667
/**
 *	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.
 *
5668
 *	This is a wrapper around register_netdevice that takes the rtnl semaphore
L
Linus Torvalds 已提交
5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682
 *	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();
	err = register_netdevice(dev);
	rtnl_unlock();
	return err;
}
EXPORT_SYMBOL(register_netdev);

E
Eric Dumazet 已提交
5683 5684 5685 5686 5687 5688 5689 5690 5691 5692
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
5693 5694 5695 5696 5697 5698 5699 5700 5701
/*
 * 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
5702
 * call dev_put.
L
Linus Torvalds 已提交
5703 5704 5705 5706
 */
static void netdev_wait_allrefs(struct net_device *dev)
{
	unsigned long rebroadcast_time, warning_time;
E
Eric Dumazet 已提交
5707
	int refcnt;
L
Linus Torvalds 已提交
5708

5709 5710
	linkwatch_forget_dev(dev);

L
Linus Torvalds 已提交
5711
	rebroadcast_time = warning_time = jiffies;
E
Eric Dumazet 已提交
5712 5713 5714
	refcnt = netdev_refcnt_read(dev);

	while (refcnt != 0) {
L
Linus Torvalds 已提交
5715
		if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5716
			rtnl_lock();
L
Linus Torvalds 已提交
5717 5718

			/* Rebroadcast unregister notification */
5719
			call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5720
			/* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5721
			 * should have already handle it the first time */
L
Linus Torvalds 已提交
5722 5723 5724 5725 5726 5727 5728 5729 5730 5731 5732 5733

			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();
			}

5734
			__rtnl_unlock();
L
Linus Torvalds 已提交
5735 5736 5737 5738 5739 5740

			rebroadcast_time = jiffies;
		}

		msleep(250);

E
Eric Dumazet 已提交
5741 5742
		refcnt = netdev_refcnt_read(dev);

L
Linus Torvalds 已提交
5743 5744 5745 5746
		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
5747
			       dev->name, refcnt);
L
Linus Torvalds 已提交
5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762 5763 5764 5765 5766
			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
5767
 * We are invoked by rtnl_unlock().
L
Linus Torvalds 已提交
5768
 * This allows us to deal with problems:
5769
 * 1) We can delete sysfs objects which invoke hotplug
L
Linus Torvalds 已提交
5770 5771 5772
 *    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
5773 5774 5775
 *
 * 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
5776 5777 5778
 */
void netdev_run_todo(void)
{
5779
	struct list_head list;
L
Linus Torvalds 已提交
5780 5781

	/* Snapshot list, allow later requests */
5782
	list_replace_init(&net_todo_list, &list);
H
Herbert Xu 已提交
5783 5784

	__rtnl_unlock();
5785

5786 5787 5788 5789 5790 5791
	/* Wait for rcu callbacks to finish before attempting to drain
	 * the device list.  This usually avoids a 250ms wait.
	 */
	if (!list_empty(&list))
		rcu_barrier();

L
Linus Torvalds 已提交
5792 5793
	while (!list_empty(&list)) {
		struct net_device *dev
5794
			= list_first_entry(&list, struct net_device, todo_list);
L
Linus Torvalds 已提交
5795 5796
		list_del(&dev->todo_list);

5797 5798 5799 5800 5801 5802
		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
5803

5804
		dev->reg_state = NETREG_UNREGISTERED;
L
Linus Torvalds 已提交
5805

5806
		on_each_cpu(flush_backlog, dev, 1);
5807

5808
		netdev_wait_allrefs(dev);
L
Linus Torvalds 已提交
5809

5810
		/* paranoia */
E
Eric Dumazet 已提交
5811
		BUG_ON(netdev_refcnt_read(dev));
5812 5813
		WARN_ON(rcu_access_pointer(dev->ip_ptr));
		WARN_ON(rcu_access_pointer(dev->ip6_ptr));
5814
		WARN_ON(dev->dn_ptr);
L
Linus Torvalds 已提交
5815

5816 5817
		if (dev->destructor)
			dev->destructor(dev);
5818 5819 5820

		/* Free network device */
		kobject_put(&dev->dev.kobj);
L
Linus Torvalds 已提交
5821 5822 5823
	}
}

5824 5825 5826 5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840 5841 5842 5843 5844
/* 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
}

5845 5846 5847
/**
 *	dev_get_stats	- get network device statistics
 *	@dev: device to get statistics from
5848
 *	@storage: place to store stats
5849
 *
5850 5851 5852 5853
 *	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.
5854
 */
5855 5856
struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
					struct rtnl_link_stats64 *storage)
5857
{
5858 5859
	const struct net_device_ops *ops = dev->netdev_ops;

5860 5861
	if (ops->ndo_get_stats64) {
		memset(storage, 0, sizeof(*storage));
5862 5863
		ops->ndo_get_stats64(dev, storage);
	} else if (ops->ndo_get_stats) {
5864
		netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5865 5866
	} else {
		netdev_stats_to_stats64(storage, &dev->stats);
5867
	}
5868
	storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5869
	return storage;
R
Rusty Russell 已提交
5870
}
5871
EXPORT_SYMBOL(dev_get_stats);
R
Rusty Russell 已提交
5872

5873
struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5874
{
5875
	struct netdev_queue *queue = dev_ingress_queue(dev);
5876

5877 5878 5879 5880 5881 5882 5883 5884 5885 5886 5887 5888
#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;
5889 5890
}

L
Linus Torvalds 已提交
5891
/**
T
Tom Herbert 已提交
5892
 *	alloc_netdev_mqs - allocate network device
L
Linus Torvalds 已提交
5893 5894 5895
 *	@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
5896 5897
 *	@txqs:		the number of TX subqueues to allocate
 *	@rxqs:		the number of RX subqueues to allocate
L
Linus Torvalds 已提交
5898 5899
 *
 *	Allocates a struct net_device with private data area for driver use
5900
 *	and performs basic initialization.  Also allocates subquue structs
T
Tom Herbert 已提交
5901
 *	for each queue on the device.
L
Linus Torvalds 已提交
5902
 */
T
Tom Herbert 已提交
5903 5904 5905
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
5906 5907
{
	struct net_device *dev;
5908
	size_t alloc_size;
5909
	struct net_device *p;
L
Linus Torvalds 已提交
5910

5911 5912
	BUG_ON(strlen(name) >= sizeof(dev->name));

T
Tom Herbert 已提交
5913
	if (txqs < 1) {
5914 5915 5916 5917 5918
		pr_err("alloc_netdev: Unable to allocate device "
		       "with zero queues.\n");
		return NULL;
	}

T
Tom Herbert 已提交
5919 5920 5921 5922 5923 5924 5925 5926
#ifdef CONFIG_RPS
	if (rxqs < 1) {
		pr_err("alloc_netdev: Unable to allocate device "
		       "with zero RX queues.\n");
		return NULL;
	}
#endif

5927
	alloc_size = sizeof(struct net_device);
5928 5929
	if (sizeof_priv) {
		/* ensure 32-byte alignment of private area */
5930
		alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5931 5932 5933
		alloc_size += sizeof_priv;
	}
	/* ensure 32-byte alignment of whole construct */
5934
	alloc_size += NETDEV_ALIGN - 1;
L
Linus Torvalds 已提交
5935

5936
	p = kzalloc(alloc_size, GFP_KERNEL);
L
Linus Torvalds 已提交
5937
	if (!p) {
5938
		printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
L
Linus Torvalds 已提交
5939 5940 5941
		return NULL;
	}

5942
	dev = PTR_ALIGN(p, NETDEV_ALIGN);
L
Linus Torvalds 已提交
5943
	dev->padded = (char *)dev - (char *)p;
5944

E
Eric Dumazet 已提交
5945 5946
	dev->pcpu_refcnt = alloc_percpu(int);
	if (!dev->pcpu_refcnt)
5947
		goto free_p;
5948 5949

	if (dev_addr_init(dev))
E
Eric Dumazet 已提交
5950
		goto free_pcpu;
5951

5952
	dev_mc_init(dev);
5953
	dev_uc_init(dev);
J
Jiri Pirko 已提交
5954

5955
	dev_net_set(dev, &init_net);
L
Linus Torvalds 已提交
5956

5957 5958 5959 5960 5961 5962 5963 5964
	dev->gso_max_size = GSO_MAX_SIZE;

	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
5965 5966
	dev->num_tx_queues = txqs;
	dev->real_num_tx_queues = txqs;
5967
	if (netif_alloc_netdev_queues(dev))
5968
		goto free_all;
5969

E
Eric Dumazet 已提交
5970
#ifdef CONFIG_RPS
T
Tom Herbert 已提交
5971 5972
	dev->num_rx_queues = rxqs;
	dev->real_num_rx_queues = rxqs;
T
Tom Herbert 已提交
5973
	if (netif_alloc_rx_queues(dev))
5974
		goto free_all;
E
Eric Dumazet 已提交
5975
#endif
T
Tom Herbert 已提交
5976

L
Linus Torvalds 已提交
5977
	strcpy(dev->name, name);
5978
	dev->group = INIT_NETDEV_GROUP;
L
Linus Torvalds 已提交
5979
	return dev;
5980

5981 5982 5983 5984
free_all:
	free_netdev(dev);
	return NULL;

E
Eric Dumazet 已提交
5985 5986
free_pcpu:
	free_percpu(dev->pcpu_refcnt);
5987
	kfree(dev->_tx);
T
Tom Herbert 已提交
5988 5989 5990 5991
#ifdef CONFIG_RPS
	kfree(dev->_rx);
#endif

5992 5993 5994
free_p:
	kfree(p);
	return NULL;
L
Linus Torvalds 已提交
5995
}
T
Tom Herbert 已提交
5996
EXPORT_SYMBOL(alloc_netdev_mqs);
L
Linus Torvalds 已提交
5997 5998 5999 6000 6001

/**
 *	free_netdev - free network device
 *	@dev: device
 *
6002 6003
 *	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
6004 6005 6006 6007
 *	If this is the last reference then it will be freed.
 */
void free_netdev(struct net_device *dev)
{
6008 6009
	struct napi_struct *p, *n;

6010 6011
	release_net(dev_net(dev));

6012
	kfree(dev->_tx);
T
Tom Herbert 已提交
6013 6014 6015
#ifdef CONFIG_RPS
	kfree(dev->_rx);
#endif
6016

6017
	kfree(rcu_dereference_protected(dev->ingress_queue, 1));
6018

6019 6020 6021
	/* Flush device addresses */
	dev_addr_flush(dev);

6022 6023 6024
	list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
		netif_napi_del(p);

E
Eric Dumazet 已提交
6025 6026 6027
	free_percpu(dev->pcpu_refcnt);
	dev->pcpu_refcnt = NULL;

S
Stephen Hemminger 已提交
6028
	/*  Compatibility with error handling in drivers */
L
Linus Torvalds 已提交
6029 6030 6031 6032 6033 6034 6035 6036
	if (dev->reg_state == NETREG_UNINITIALIZED) {
		kfree((char *)dev - dev->padded);
		return;
	}

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

6037 6038
	/* will free via device release */
	put_device(&dev->dev);
L
Linus Torvalds 已提交
6039
}
E
Eric Dumazet 已提交
6040
EXPORT_SYMBOL(free_netdev);
6041

6042 6043 6044 6045 6046 6047
/**
 *	synchronize_net -  Synchronize with packet receive processing
 *
 *	Wait for packets currently being received to be done.
 *	Does not block later packets from starting.
 */
6048
void synchronize_net(void)
L
Linus Torvalds 已提交
6049 6050
{
	might_sleep();
6051 6052 6053 6054
	if (rtnl_is_locked())
		synchronize_rcu_expedited();
	else
		synchronize_rcu();
L
Linus Torvalds 已提交
6055
}
E
Eric Dumazet 已提交
6056
EXPORT_SYMBOL(synchronize_net);
L
Linus Torvalds 已提交
6057 6058

/**
6059
 *	unregister_netdevice_queue - remove device from the kernel
L
Linus Torvalds 已提交
6060
 *	@dev: device
6061
 *	@head: list
6062
 *
L
Linus Torvalds 已提交
6063
 *	This function shuts down a device interface and removes it
6064
 *	from the kernel tables.
6065
 *	If head not NULL, device is queued to be unregistered later.
L
Linus Torvalds 已提交
6066 6067 6068 6069 6070
 *
 *	Callers must hold the rtnl semaphore.  You may want
 *	unregister_netdev() instead of this.
 */

6071
void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
L
Linus Torvalds 已提交
6072
{
6073 6074
	ASSERT_RTNL();

6075
	if (head) {
6076
		list_move_tail(&dev->unreg_list, head);
6077 6078 6079 6080 6081
	} else {
		rollback_registered(dev);
		/* Finish processing unregister after unlock */
		net_set_todo(dev);
	}
L
Linus Torvalds 已提交
6082
}
6083
EXPORT_SYMBOL(unregister_netdevice_queue);
L
Linus Torvalds 已提交
6084

6085 6086 6087 6088 6089 6090 6091 6092 6093 6094 6095 6096 6097 6098
/**
 *	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);
	}
}
6099
EXPORT_SYMBOL(unregister_netdevice_many);
6100

L
Linus Torvalds 已提交
6101 6102 6103 6104 6105
/**
 *	unregister_netdev - remove device from the kernel
 *	@dev: device
 *
 *	This function shuts down a device interface and removes it
6106
 *	from the kernel tables.
L
Linus Torvalds 已提交
6107 6108 6109 6110 6111 6112 6113 6114 6115 6116 6117 6118 6119
 *
 *	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);

6120 6121 6122 6123 6124 6125 6126 6127 6128 6129 6130 6131 6132 6133 6134 6135 6136 6137 6138 6139 6140 6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151
/**
 *	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;
6152
	if (net_eq(dev_net(dev), net))
6153 6154 6155 6156 6157 6158
		goto out;

	/* Pick the destination device name, and ensure
	 * we can use it in the destination network namespace.
	 */
	err = -EEXIST;
6159
	if (__dev_get_by_name(net, dev->name)) {
6160 6161 6162
		/* We get here if we can't use the current device name */
		if (!pat)
			goto out;
6163
		if (dev_get_valid_name(dev, pat) < 0)
6164 6165 6166 6167 6168 6169 6170 6171
			goto out;
	}

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

	/* If device is running close it first. */
6172
	dev_close(dev);
6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184

	/* 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.
6185 6186 6187 6188

	   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.
6189 6190
	*/
	call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6191
	call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
6192
	rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
6193 6194 6195 6196

	/*
	 *	Flush the unicast and multicast chains
	 */
6197
	dev_uc_flush(dev);
6198
	dev_mc_flush(dev);
6199 6200

	/* Actually switch the network namespace */
6201
	dev_net_set(dev, net);
6202 6203 6204 6205 6206 6207 6208 6209 6210

	/* 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;
	}

6211
	/* Fixup kobjects */
6212
	err = device_rename(&dev->dev, dev->name);
6213
	WARN_ON(err);
6214 6215 6216 6217 6218 6219 6220

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

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

6221 6222 6223 6224 6225 6226
	/*
	 *	Prevent userspace races by waiting until the network
	 *	device is fully setup before sending notifications.
	 */
	rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);

6227 6228 6229 6230 6231
	synchronize_net();
	err = 0;
out:
	return err;
}
6232
EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6233

L
Linus Torvalds 已提交
6234 6235 6236 6237 6238 6239 6240 6241 6242
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;

6243
	if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
L
Linus Torvalds 已提交
6244 6245 6246 6247 6248 6249 6250 6251 6252 6253 6254 6255 6256 6257 6258 6259
		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. */
6260 6261 6262 6263 6264 6265
	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;
	}
6266 6267 6268 6269 6270
	/* Append NAPI poll list from offline CPU. */
	if (!list_empty(&oldsd->poll_list)) {
		list_splice_init(&oldsd->poll_list, &sd->poll_list);
		raise_softirq_irqoff(NET_RX_SOFTIRQ);
	}
L
Linus Torvalds 已提交
6271 6272 6273 6274 6275

	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	local_irq_enable();

	/* Process offline CPU's input_pkt_queue */
6276
	while ((skb = __skb_dequeue(&oldsd->process_queue))) {
L
Linus Torvalds 已提交
6277
		netif_rx(skb);
6278
		input_queue_head_incr(oldsd);
T
Tom Herbert 已提交
6279
	}
6280
	while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6281
		netif_rx(skb);
6282 6283
		input_queue_head_incr(oldsd);
	}
L
Linus Torvalds 已提交
6284 6285 6286 6287 6288

	return NOTIFY_OK;
}


6289
/**
6290 6291 6292 6293
 *	netdev_increment_features - increment feature set by one
 *	@all: current feature set
 *	@one: new feature set
 *	@mask: mask feature set
6294 6295
 *
 *	Computes a new feature set after adding a device with feature set
6296 6297
 *	@one to the master device with current feature set @all.  Will not
 *	enable anything that is off in @mask. Returns the new feature set.
6298
 */
6299 6300
netdev_features_t netdev_increment_features(netdev_features_t all,
	netdev_features_t one, netdev_features_t mask)
6301
{
6302 6303 6304
	if (mask & NETIF_F_GEN_CSUM)
		mask |= NETIF_F_ALL_CSUM;
	mask |= NETIF_F_VLAN_CHALLENGED;
6305

6306 6307
	all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
	all &= one | ~NETIF_F_ALL_FOR_ALL;
6308

6309 6310 6311
	/* If one device supports hw checksumming, set for all. */
	if (all & NETIF_F_GEN_CSUM)
		all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6312 6313 6314

	return all;
}
6315
EXPORT_SYMBOL(netdev_increment_features);
6316

6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329
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;
}

6330
/* Initialize per network namespace state */
6331
static int __net_init netdev_init(struct net *net)
6332 6333 6334
{
	INIT_LIST_HEAD(&net->dev_base_head);

6335 6336 6337
	net->dev_name_head = netdev_create_hash();
	if (net->dev_name_head == NULL)
		goto err_name;
6338

6339 6340 6341
	net->dev_index_head = netdev_create_hash();
	if (net->dev_index_head == NULL)
		goto err_idx;
6342 6343

	return 0;
6344 6345 6346 6347 6348

err_idx:
	kfree(net->dev_name_head);
err_name:
	return -ENOMEM;
6349 6350
}

6351 6352 6353 6354 6355 6356
/**
 *	netdev_drivername - network driver for the device
 *	@dev: network device
 *
 *	Determine network driver for device.
 */
6357
const char *netdev_drivername(const struct net_device *dev)
6358
{
6359 6360
	const struct device_driver *driver;
	const struct device *parent;
6361
	const char *empty = "";
6362 6363 6364

	parent = dev->dev.parent;
	if (!parent)
6365
		return empty;
6366 6367 6368

	driver = parent->driver;
	if (driver && driver->name)
6369 6370
		return driver->name;
	return empty;
6371 6372
}

6373
int __netdev_printk(const char *level, const struct net_device *dev,
6374 6375 6376 6377 6378 6379 6380 6381 6382 6383 6384 6385 6386 6387
			   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;
}
6388
EXPORT_SYMBOL(__netdev_printk);
6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399 6400 6401 6402 6403 6404 6405 6406 6407 6408 6409 6410 6411 6412 6413 6414 6415 6416 6417 6418 6419 6420 6421 6422 6423 6424 6425 6426 6427 6428 6429 6430 6431 6432 6433 6434 6435

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);

6436
static void __net_exit netdev_exit(struct net *net)
6437 6438 6439 6440 6441
{
	kfree(net->dev_name_head);
	kfree(net->dev_index_head);
}

6442
static struct pernet_operations __net_initdata netdev_net_ops = {
6443 6444 6445 6446
	.init = netdev_init,
	.exit = netdev_exit,
};

6447
static void __net_exit default_device_exit(struct net *net)
6448
{
6449
	struct net_device *dev, *aux;
6450
	/*
6451
	 * Push all migratable network devices back to the
6452 6453 6454
	 * initial network namespace
	 */
	rtnl_lock();
6455
	for_each_netdev_safe(net, dev, aux) {
6456
		int err;
6457
		char fb_name[IFNAMSIZ];
6458 6459 6460 6461 6462

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

6463 6464 6465
		/* Leave virtual devices for the generic cleanup */
		if (dev->rtnl_link_ops)
			continue;
6466

L
Lucas De Marchi 已提交
6467
		/* Push remaining network devices to init_net */
6468 6469
		snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
		err = dev_change_net_namespace(dev, &init_net, fb_name);
6470
		if (err) {
6471
			printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
6472
				__func__, dev->name, err);
6473
			BUG();
6474 6475 6476 6477 6478
		}
	}
	rtnl_unlock();
}

6479 6480 6481
static void __net_exit default_device_exit_batch(struct list_head *net_list)
{
	/* At exit all network devices most be removed from a network
6482
	 * namespace.  Do this in the reverse order of registration.
6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498 6499
	 * 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);
E
Eric Dumazet 已提交
6500
	list_del(&dev_kill_list);
6501 6502 6503
	rtnl_unlock();
}

6504
static struct pernet_operations __net_initdata default_device_ops = {
6505
	.exit = default_device_exit,
6506
	.exit_batch = default_device_exit_batch,
6507 6508
};

L
Linus Torvalds 已提交
6509 6510 6511 6512 6513 6514 6515 6516 6517 6518 6519 6520 6521 6522 6523 6524 6525 6526 6527 6528
/*
 *	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;

6529
	if (netdev_kobject_init())
L
Linus Torvalds 已提交
6530 6531 6532
		goto out;

	INIT_LIST_HEAD(&ptype_all);
6533
	for (i = 0; i < PTYPE_HASH_SIZE; i++)
L
Linus Torvalds 已提交
6534 6535
		INIT_LIST_HEAD(&ptype_base[i]);

6536 6537
	if (register_pernet_subsys(&netdev_net_ops))
		goto out;
L
Linus Torvalds 已提交
6538 6539 6540 6541 6542

	/*
	 *	Initialise the packet receive queues.
	 */

6543
	for_each_possible_cpu(i) {
E
Eric Dumazet 已提交
6544
		struct softnet_data *sd = &per_cpu(softnet_data, i);
L
Linus Torvalds 已提交
6545

C
Changli Gao 已提交
6546
		memset(sd, 0, sizeof(*sd));
E
Eric Dumazet 已提交
6547
		skb_queue_head_init(&sd->input_pkt_queue);
6548
		skb_queue_head_init(&sd->process_queue);
E
Eric Dumazet 已提交
6549 6550
		sd->completion_queue = NULL;
		INIT_LIST_HEAD(&sd->poll_list);
6551 6552
		sd->output_queue = NULL;
		sd->output_queue_tailp = &sd->output_queue;
E
Eric Dumazet 已提交
6553
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
6554 6555 6556 6557
		sd->csd.func = rps_trigger_softirq;
		sd->csd.info = sd;
		sd->csd.flags = 0;
		sd->cpu = i;
6558
#endif
T
Tom Herbert 已提交
6559

E
Eric Dumazet 已提交
6560 6561 6562 6563
		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
6564 6565 6566 6567
	}

	dev_boot_phase = 0;

6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582
	/* 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;

6583 6584
	open_softirq(NET_TX_SOFTIRQ, net_tx_action);
	open_softirq(NET_RX_SOFTIRQ, net_rx_action);
L
Linus Torvalds 已提交
6585 6586 6587 6588 6589 6590 6591 6592 6593 6594 6595

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

subsys_initcall(net_dev_init);

6596 6597
static int __init initialize_hashrnd(void)
{
T
Tom Herbert 已提交
6598
	get_random_bytes(&hashrnd, sizeof(hashrnd));
6599 6600 6601 6602 6603
	return 0;
}

late_initcall_sync(initialize_hashrnd);