dev.c 162.1 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 <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/static_key.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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{
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	unsigned int 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,
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	 ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
	 ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
	 ARPHRD_IEEE802154, 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",
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	 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
	 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
	 "_xmit_IEEE802154", "_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;
		}
	}

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	pr_warn("dev_remove_pack: %p not found\n", pt);
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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
535
EXPORT_SYMBOL(netdev_boot_setup_check);
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536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559


/**
 *	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
	 */
560
	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
606
 *	@net: the applicable net namespace
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 *	@name: name to find
 *
 *	Find an interface by name. Must be called under RTNL semaphore
 *	or @dev_base_lock. If the name is found a pointer to the device
 *	is returned. If the name is not found then %NULL is returned. The
 *	reference counters are not incremented so the caller must be
 *	careful with locks.
 */

616
struct net_device *__dev_get_by_name(struct net *net, const char *name)
L
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{
	struct hlist_node *p;
E
Eric Dumazet 已提交
619 620
	struct net_device *dev;
	struct hlist_head *head = dev_name_hash(net, name);
L
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621

E
Eric Dumazet 已提交
622
	hlist_for_each_entry(dev, p, head, name_hlist)
L
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623 624
		if (!strncmp(dev->name, name, IFNAMSIZ))
			return dev;
E
Eric Dumazet 已提交
625

L
Linus Torvalds 已提交
626 627
	return NULL;
}
E
Eric Dumazet 已提交
628
EXPORT_SYMBOL(__dev_get_by_name);
L
Linus Torvalds 已提交
629

630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655
/**
 *	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
656 657
/**
 *	dev_get_by_name		- find a device by its name
658
 *	@net: the applicable net namespace
L
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659 660 661 662 663 664 665 666 667
 *	@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.
 */

668
struct net_device *dev_get_by_name(struct net *net, const char *name)
L
Linus Torvalds 已提交
669 670 671
{
	struct net_device *dev;

672 673
	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
L
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674 675
	if (dev)
		dev_hold(dev);
676
	rcu_read_unlock();
L
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677 678
	return dev;
}
E
Eric Dumazet 已提交
679
EXPORT_SYMBOL(dev_get_by_name);
L
Linus Torvalds 已提交
680 681 682

/**
 *	__dev_get_by_index - find a device by its ifindex
683
 *	@net: the applicable net namespace
L
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684 685 686 687 688 689 690 691 692
 *	@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.
 */

693
struct net_device *__dev_get_by_index(struct net *net, int ifindex)
L
Linus Torvalds 已提交
694 695
{
	struct hlist_node *p;
E
Eric Dumazet 已提交
696 697
	struct net_device *dev;
	struct hlist_head *head = dev_index_hash(net, ifindex);
L
Linus Torvalds 已提交
698

E
Eric Dumazet 已提交
699
	hlist_for_each_entry(dev, p, head, index_hlist)
L
Linus Torvalds 已提交
700 701
		if (dev->ifindex == ifindex)
			return dev;
E
Eric Dumazet 已提交
702

L
Linus Torvalds 已提交
703 704
	return NULL;
}
E
Eric Dumazet 已提交
705
EXPORT_SYMBOL(__dev_get_by_index);
L
Linus Torvalds 已提交
706

707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731
/**
 *	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
732 733 734

/**
 *	dev_get_by_index - find a device by its ifindex
735
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
736 737 738 739 740 741 742 743
 *	@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.
 */

744
struct net_device *dev_get_by_index(struct net *net, int ifindex)
L
Linus Torvalds 已提交
745 746 747
{
	struct net_device *dev;

748 749
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifindex);
L
Linus Torvalds 已提交
750 751
	if (dev)
		dev_hold(dev);
752
	rcu_read_unlock();
L
Linus Torvalds 已提交
753 754
	return dev;
}
E
Eric Dumazet 已提交
755
EXPORT_SYMBOL(dev_get_by_index);
L
Linus Torvalds 已提交
756 757

/**
758
 *	dev_getbyhwaddr_rcu - find a device by its hardware address
759
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
760 761 762 763
 *	@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
764 765
 *	is not found or a pointer to the device.
 *	The caller must hold RCU or RTNL.
766
 *	The returned device has not had its ref count increased
L
Linus Torvalds 已提交
767 768 769 770
 *	and the caller must therefore be careful about locking
 *
 */

771 772
struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
				       const char *ha)
L
Linus Torvalds 已提交
773 774 775
{
	struct net_device *dev;

776
	for_each_netdev_rcu(net, dev)
L
Linus Torvalds 已提交
777 778
		if (dev->type == type &&
		    !memcmp(dev->dev_addr, ha, dev->addr_len))
779 780 781
			return dev;

	return NULL;
L
Linus Torvalds 已提交
782
}
783
EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
784

785
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
L
Linus Torvalds 已提交
786 787 788
{
	struct net_device *dev;

789
	ASSERT_RTNL();
790
	for_each_netdev(net, dev)
791
		if (dev->type == type)
792 793 794
			return dev;

	return NULL;
795 796 797
}
EXPORT_SYMBOL(__dev_getfirstbyhwtype);

798
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
799
{
800
	struct net_device *dev, *ret = NULL;
801

802 803 804 805 806 807 808 809 810
	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
Linus Torvalds 已提交
811 812 813 814
}
EXPORT_SYMBOL(dev_getfirstbyhwtype);

/**
E
Eric Dumazet 已提交
815
 *	dev_get_by_flags_rcu - find any device with given flags
816
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
817 818 819 820
 *	@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
821 822
 *	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
823 824
 */

E
Eric Dumazet 已提交
825
struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags,
E
Eric Dumazet 已提交
826
				    unsigned short mask)
L
Linus Torvalds 已提交
827
{
828
	struct net_device *dev, *ret;
L
Linus Torvalds 已提交
829

830
	ret = NULL;
831
	for_each_netdev_rcu(net, dev) {
L
Linus Torvalds 已提交
832
		if (((dev->flags ^ if_flags) & mask) == 0) {
833
			ret = dev;
L
Linus Torvalds 已提交
834 835 836
			break;
		}
	}
837
	return ret;
L
Linus Torvalds 已提交
838
}
E
Eric Dumazet 已提交
839
EXPORT_SYMBOL(dev_get_by_flags_rcu);
L
Linus Torvalds 已提交
840 841 842 843 844 845

/**
 *	dev_valid_name - check if name is okay for network device
 *	@name: name string
 *
 *	Network device names need to be valid file names to
846 847
 *	to allow sysfs to work.  We also disallow any kind of
 *	whitespace.
L
Linus Torvalds 已提交
848
 */
849
bool dev_valid_name(const char *name)
L
Linus Torvalds 已提交
850
{
851
	if (*name == '\0')
852
		return false;
853
	if (strlen(name) >= IFNAMSIZ)
854
		return false;
855
	if (!strcmp(name, ".") || !strcmp(name, ".."))
856
		return false;
857 858 859

	while (*name) {
		if (*name == '/' || isspace(*name))
860
			return false;
861 862
		name++;
	}
863
	return true;
L
Linus Torvalds 已提交
864
}
E
Eric Dumazet 已提交
865
EXPORT_SYMBOL(dev_valid_name);
L
Linus Torvalds 已提交
866 867

/**
868 869
 *	__dev_alloc_name - allocate a name for a device
 *	@net: network namespace to allocate the device name in
L
Linus Torvalds 已提交
870
 *	@name: name format string
871
 *	@buf:  scratch buffer and result name string
L
Linus Torvalds 已提交
872 873
 *
 *	Passed a format string - eg "lt%d" it will try and find a suitable
S
Stephen Hemminger 已提交
874 875 876 877 878 879
 *	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
880 881
 */

882
static int __dev_alloc_name(struct net *net, const char *name, char *buf)
L
Linus Torvalds 已提交
883 884 885 886
{
	int i = 0;
	const char *p;
	const int max_netdevices = 8*PAGE_SIZE;
S
Stephen Hemminger 已提交
887
	unsigned long *inuse;
L
Linus Torvalds 已提交
888 889 890 891 892 893 894 895 896 897 898 899 900
	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
901
		inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
L
Linus Torvalds 已提交
902 903 904
		if (!inuse)
			return -ENOMEM;

905
		for_each_netdev(net, d) {
L
Linus Torvalds 已提交
906 907 908 909 910 911
			if (!sscanf(d->name, name, &i))
				continue;
			if (i < 0 || i >= max_netdevices)
				continue;

			/*  avoid cases where sscanf is not exact inverse of printf */
912
			snprintf(buf, IFNAMSIZ, name, i);
L
Linus Torvalds 已提交
913 914 915 916 917 918 919 920
			if (!strncmp(buf, d->name, IFNAMSIZ))
				set_bit(i, inuse);
		}

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

921 922
	if (buf != name)
		snprintf(buf, IFNAMSIZ, name, i);
923
	if (!__dev_get_by_name(net, buf))
L
Linus Torvalds 已提交
924 925 926 927 928 929 930 931 932
		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;
}

933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952
/**
 *	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;

953 954
	BUG_ON(!dev_net(dev));
	net = dev_net(dev);
955 956 957 958 959
	ret = __dev_alloc_name(net, name, buf);
	if (ret >= 0)
		strlcpy(dev->name, buf, IFNAMSIZ);
	return ret;
}
E
Eric Dumazet 已提交
960
EXPORT_SYMBOL(dev_alloc_name);
961

962
static int dev_get_valid_name(struct net_device *dev, const char *name)
963
{
964 965 966 967 968
	struct net *net;

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

969 970 971
	if (!dev_valid_name(name))
		return -EINVAL;

972
	if (strchr(name, '%'))
973
		return dev_alloc_name(dev, name);
974 975
	else if (__dev_get_by_name(net, name))
		return -EEXIST;
976 977
	else if (dev->name != name)
		strlcpy(dev->name, name, IFNAMSIZ);
978 979 980

	return 0;
}
L
Linus Torvalds 已提交
981 982 983 984 985 986 987 988 989

/**
 *	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.
 */
990
int dev_change_name(struct net_device *dev, const char *newname)
L
Linus Torvalds 已提交
991
{
992
	char oldname[IFNAMSIZ];
L
Linus Torvalds 已提交
993
	int err = 0;
994
	int ret;
995
	struct net *net;
L
Linus Torvalds 已提交
996 997

	ASSERT_RTNL();
998
	BUG_ON(!dev_net(dev));
L
Linus Torvalds 已提交
999

1000
	net = dev_net(dev);
L
Linus Torvalds 已提交
1001 1002 1003
	if (dev->flags & IFF_UP)
		return -EBUSY;

1004 1005 1006
	if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
		return 0;

1007 1008
	memcpy(oldname, dev->name, IFNAMSIZ);

1009
	err = dev_get_valid_name(dev, newname);
1010 1011
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
1012

1013
rollback:
1014 1015 1016 1017
	ret = device_rename(&dev->dev, dev->name);
	if (ret) {
		memcpy(dev->name, oldname, IFNAMSIZ);
		return ret;
1018
	}
1019 1020

	write_lock_bh(&dev_base_lock);
1021
	hlist_del_rcu(&dev->name_hlist);
1022 1023 1024 1025 1026 1027
	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));
1028 1029
	write_unlock_bh(&dev_base_lock);

1030
	ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1031 1032 1033
	ret = notifier_to_errno(ret);

	if (ret) {
1034 1035
		/* err >= 0 after dev_alloc_name() or stores the first errno */
		if (err >= 0) {
1036 1037 1038
			err = ret;
			memcpy(dev->name, oldname, IFNAMSIZ);
			goto rollback;
1039
		} else {
1040
			pr_err("%s: name change rollback failed: %d\n",
1041
			       dev->name, ret);
1042 1043
		}
	}
L
Linus Torvalds 已提交
1044 1045 1046 1047

	return err;
}

1048 1049 1050 1051
/**
 *	dev_set_alias - change ifalias of a device
 *	@dev: device
 *	@alias: name up to IFALIASZ
1052
 *	@len: limit of bytes to copy from info
1053 1054 1055 1056 1057
 *
 *	Set ifalias for a device,
 */
int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
{
1058 1059
	char *new_ifalias;

1060 1061 1062 1063 1064
	ASSERT_RTNL();

	if (len >= IFALIASZ)
		return -EINVAL;

1065 1066 1067 1068 1069 1070 1071 1072
	if (!len) {
		if (dev->ifalias) {
			kfree(dev->ifalias);
			dev->ifalias = NULL;
		}
		return 0;
	}

1073 1074
	new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
	if (!new_ifalias)
1075
		return -ENOMEM;
1076
	dev->ifalias = new_ifalias;
1077 1078 1079 1080 1081 1082

	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 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129
/**
 * 	netdev_notify_peers - notify network peers about existence of @dev
 * 	@dev: network device
 *
 * Generate traffic such that interested network peers are aware of
 * @dev, such as by generating a gratuitous ARP. This may be used when
 * a device wants to inform the rest of the network about some sort of
 * reconfiguration such as a failover event or virtual machine
 * migration.
 */
void netdev_notify_peers(struct net_device *dev)
{
	rtnl_lock();
	call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
	rtnl_unlock();
}
EXPORT_SYMBOL(netdev_notify_peers);

L
Linus Torvalds 已提交
1130 1131
/**
 *	dev_load 	- load a network module
1132
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
1133 1134 1135 1136 1137 1138 1139
 *	@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.
 */

1140
void dev_load(struct net *net, const char *name)
L
Linus Torvalds 已提交
1141
{
1142
	struct net_device *dev;
1143
	int no_module;
L
Linus Torvalds 已提交
1144

1145 1146 1147
	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
	rcu_read_unlock();
L
Linus Torvalds 已提交
1148

1149 1150 1151 1152 1153
	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))
1154 1155
			pr_warn("Loading kernel module for a network device with CAP_SYS_MODULE (deprecated).  Use CAP_NET_ADMIN and alias netdev-%s instead.\n",
				name);
1156
	}
L
Linus Torvalds 已提交
1157
}
E
Eric Dumazet 已提交
1158
EXPORT_SYMBOL(dev_load);
L
Linus Torvalds 已提交
1159

1160
static int __dev_open(struct net_device *dev)
L
Linus Torvalds 已提交
1161
{
1162
	const struct net_device_ops *ops = dev->netdev_ops;
1163
	int ret;
L
Linus Torvalds 已提交
1164

1165 1166
	ASSERT_RTNL();

L
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1167 1168 1169
	if (!netif_device_present(dev))
		return -ENODEV;

1170 1171 1172 1173 1174
	ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		return ret;

L
Linus Torvalds 已提交
1175
	set_bit(__LINK_STATE_START, &dev->state);
1176

1177 1178
	if (ops->ndo_validate_addr)
		ret = ops->ndo_validate_addr(dev);
1179

1180 1181
	if (!ret && ops->ndo_open)
		ret = ops->ndo_open(dev);
L
Linus Torvalds 已提交
1182

1183 1184 1185
	if (ret)
		clear_bit(__LINK_STATE_START, &dev->state);
	else {
L
Linus Torvalds 已提交
1186
		dev->flags |= IFF_UP;
1187
		net_dmaengine_get();
1188
		dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
1189
		dev_activate(dev);
1190
		add_device_randomness(dev->dev_addr, dev->addr_len);
L
Linus Torvalds 已提交
1191
	}
1192

L
Linus Torvalds 已提交
1193 1194 1195 1196
	return ret;
}

/**
1197 1198
 *	dev_open	- prepare an interface for use.
 *	@dev:	device to open
L
Linus Torvalds 已提交
1199
 *
1200 1201 1202 1203 1204 1205 1206
 *	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
1207
 */
1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225
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);

1226
static int __dev_close_many(struct list_head *head)
L
Linus Torvalds 已提交
1227
{
1228
	struct net_device *dev;
1229

1230
	ASSERT_RTNL();
1231 1232
	might_sleep();

1233 1234
	list_for_each_entry(dev, head, unreg_list) {
		call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
L
Linus Torvalds 已提交
1235

1236
		clear_bit(__LINK_STATE_START, &dev->state);
L
Linus Torvalds 已提交
1237

1238 1239 1240 1241 1242 1243 1244 1245
		/* 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
1246

1247
	dev_deactivate_many(head);
1248

1249 1250
	list_for_each_entry(dev, head, unreg_list) {
		const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
1251

1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270
		/*
		 *	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)
{
1271
	int retval;
1272 1273 1274
	LIST_HEAD(single);

	list_add(&dev->unreg_list, &single);
1275 1276 1277
	retval = __dev_close_many(&single);
	list_del(&single);
	return retval;
1278 1279
}

E
Eric Dumazet 已提交
1280
static int dev_close_many(struct list_head *head)
1281 1282 1283
{
	struct net_device *dev, *tmp;
	LIST_HEAD(tmp_list);
L
Linus Torvalds 已提交
1284

1285 1286 1287 1288 1289
	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
1290

1291 1292 1293 1294
	list_for_each_entry(dev, head, unreg_list) {
		rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
		call_netdevice_notifiers(NETDEV_DOWN, dev);
	}
1295

1296 1297
	/* rollback_registered_many needs the complete original list */
	list_splice(&tmp_list, head);
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311
	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)
{
1312 1313
	if (dev->flags & IFF_UP) {
		LIST_HEAD(single);
L
Linus Torvalds 已提交
1314

1315 1316 1317 1318
		list_add(&dev->unreg_list, &single);
		dev_close_many(&single);
		list_del(&single);
	}
L
Linus Torvalds 已提交
1319 1320
	return 0;
}
E
Eric Dumazet 已提交
1321
EXPORT_SYMBOL(dev_close);
L
Linus Torvalds 已提交
1322 1323


1324 1325 1326 1327 1328 1329 1330 1331 1332 1333
/**
 *	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)
{
1334 1335 1336 1337 1338 1339 1340
	/*
	 * 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
1341 1342
	dev->wanted_features &= ~NETIF_F_LRO;
	netdev_update_features(dev);
1343

1344 1345
	if (unlikely(dev->features & NETIF_F_LRO))
		netdev_WARN(dev, "failed to disable LRO!\n");
1346 1347 1348 1349
}
EXPORT_SYMBOL(dev_disable_lro);


1350 1351
static int dev_boot_phase = 1;

L
Linus Torvalds 已提交
1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
/**
 *	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
1362
 *	to the new notifier to allow device to have a race free
L
Linus Torvalds 已提交
1363 1364 1365 1366 1367 1368
 *	view of the network device list.
 */

int register_netdevice_notifier(struct notifier_block *nb)
{
	struct net_device *dev;
1369
	struct net_device *last;
1370
	struct net *net;
L
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1371 1372 1373
	int err;

	rtnl_lock();
1374
	err = raw_notifier_chain_register(&netdev_chain, nb);
1375 1376
	if (err)
		goto unlock;
1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387
	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
1388

1389 1390
			nb->notifier_call(nb, NETDEV_UP, dev);
		}
L
Linus Torvalds 已提交
1391
	}
1392 1393

unlock:
L
Linus Torvalds 已提交
1394 1395
	rtnl_unlock();
	return err;
1396 1397 1398

rollback:
	last = dev;
1399 1400 1401
	for_each_net(net) {
		for_each_netdev(net, dev) {
			if (dev == last)
1402
				goto outroll;
1403

1404 1405 1406 1407 1408
			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);
1409 1410
		}
	}
1411

1412
outroll:
1413
	raw_notifier_chain_unregister(&netdev_chain, nb);
1414
	goto unlock;
L
Linus Torvalds 已提交
1415
}
E
Eric Dumazet 已提交
1416
EXPORT_SYMBOL(register_netdevice_notifier);
L
Linus Torvalds 已提交
1417 1418 1419 1420 1421 1422 1423 1424 1425

/**
 *	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.
1426 1427 1428 1429
 *
 * 	After unregistering unregister and down device events are synthesized
 *	for all devices on the device list to the removed notifier to remove
 *	the need for special case cleanup code.
L
Linus Torvalds 已提交
1430 1431 1432 1433
 */

int unregister_netdevice_notifier(struct notifier_block *nb)
{
1434 1435
	struct net_device *dev;
	struct net *net;
1436 1437 1438
	int err;

	rtnl_lock();
1439
	err = raw_notifier_chain_unregister(&netdev_chain, nb);
1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452
	if (err)
		goto unlock;

	for_each_net(net) {
		for_each_netdev(net, dev) {
			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);
		}
	}
unlock:
1453 1454
	rtnl_unlock();
	return err;
L
Linus Torvalds 已提交
1455
}
E
Eric Dumazet 已提交
1456
EXPORT_SYMBOL(unregister_netdevice_notifier);
L
Linus Torvalds 已提交
1457 1458 1459 1460

/**
 *	call_netdevice_notifiers - call all network notifier blocks
 *      @val: value passed unmodified to notifier function
1461
 *      @dev: net_device pointer passed unmodified to notifier function
L
Linus Torvalds 已提交
1462 1463
 *
 *	Call all network notifier blocks.  Parameters and return value
1464
 *	are as for raw_notifier_call_chain().
L
Linus Torvalds 已提交
1465 1466
 */

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

1474
static struct static_key netstamp_needed __read_mostly;
1475
#ifdef HAVE_JUMP_LABEL
1476
/* We are not allowed to call static_key_slow_dec() from irq context
1477
 * If net_disable_timestamp() is called from irq context, defer the
1478
 * static_key_slow_dec() calls.
1479 1480 1481
 */
static atomic_t netstamp_needed_deferred;
#endif
L
Linus Torvalds 已提交
1482 1483 1484

void net_enable_timestamp(void)
{
1485 1486 1487 1488 1489
#ifdef HAVE_JUMP_LABEL
	int deferred = atomic_xchg(&netstamp_needed_deferred, 0);

	if (deferred) {
		while (--deferred)
1490
			static_key_slow_dec(&netstamp_needed);
1491 1492 1493 1494
		return;
	}
#endif
	WARN_ON(in_interrupt());
1495
	static_key_slow_inc(&netstamp_needed);
L
Linus Torvalds 已提交
1496
}
E
Eric Dumazet 已提交
1497
EXPORT_SYMBOL(net_enable_timestamp);
L
Linus Torvalds 已提交
1498 1499 1500

void net_disable_timestamp(void)
{
1501 1502 1503 1504 1505 1506
#ifdef HAVE_JUMP_LABEL
	if (in_interrupt()) {
		atomic_inc(&netstamp_needed_deferred);
		return;
	}
#endif
1507
	static_key_slow_dec(&netstamp_needed);
L
Linus Torvalds 已提交
1508
}
E
Eric Dumazet 已提交
1509
EXPORT_SYMBOL(net_disable_timestamp);
L
Linus Torvalds 已提交
1510

E
Eric Dumazet 已提交
1511
static inline void net_timestamp_set(struct sk_buff *skb)
L
Linus Torvalds 已提交
1512
{
1513
	skb->tstamp.tv64 = 0;
1514
	if (static_key_false(&netstamp_needed))
1515
		__net_timestamp(skb);
L
Linus Torvalds 已提交
1516 1517
}

1518
#define net_timestamp_check(COND, SKB)			\
1519
	if (static_key_false(&netstamp_needed)) {		\
1520 1521 1522
		if ((COND) && !(SKB)->tstamp.tv64)	\
			__net_timestamp(SKB);		\
	}						\
E
Eric Dumazet 已提交
1523

1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574
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;
}

1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595
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;
}

1596 1597 1598 1599 1600 1601 1602 1603
/**
 * dev_forward_skb - loopback an skb to another netif
 *
 * @dev: destination network device
 * @skb: buffer to forward
 *
 * return values:
 *	NET_RX_SUCCESS	(no congestion)
1604
 *	NET_RX_DROP     (packet was dropped, but freed)
1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615
 *
 * 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)
{
1616 1617 1618 1619 1620 1621 1622 1623
	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;
		}
	}

1624
	skb_orphan(skb);
1625
	nf_reset(skb);
1626

1627
	if (unlikely(!is_skb_forwardable(dev, skb))) {
1628
		atomic_long_inc(&dev->rx_dropped);
1629
		kfree_skb(skb);
1630
		return NET_RX_DROP;
1631
	}
1632
	skb->skb_iif = 0;
1633 1634
	skb->dev = dev;
	skb_dst_drop(skb);
1635 1636 1637
	skb->tstamp.tv64 = 0;
	skb->pkt_type = PACKET_HOST;
	skb->protocol = eth_type_trans(skb, dev);
1638 1639 1640
	skb->mark = 0;
	secpath_reset(skb);
	nf_reset(skb);
1641 1642 1643 1644
	return netif_rx(skb);
}
EXPORT_SYMBOL_GPL(dev_forward_skb);

1645 1646 1647 1648
static inline int deliver_skb(struct sk_buff *skb,
			      struct packet_type *pt_prev,
			      struct net_device *orig_dev)
{
1649 1650
	if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
		return -ENOMEM;
1651 1652 1653 1654
	atomic_inc(&skb->users);
	return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
}

1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667
static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
{
	if (ptype->af_packet_priv == NULL)
		return false;

	if (ptype->id_match)
		return ptype->id_match(ptype, skb->sk);
	else if ((struct sock *)ptype->af_packet_priv == skb->sk)
		return true;

	return false;
}

L
Linus Torvalds 已提交
1668 1669 1670 1671 1672
/*
 *	Support routine. Sends outgoing frames to any network
 *	taps currently in use.
 */

1673
static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
L
Linus Torvalds 已提交
1674 1675
{
	struct packet_type *ptype;
1676 1677
	struct sk_buff *skb2 = NULL;
	struct packet_type *pt_prev = NULL;
1678

L
Linus Torvalds 已提交
1679 1680 1681 1682 1683 1684
	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) &&
1685
		    (!skb_loop_sk(ptype, skb))) {
1686 1687 1688 1689 1690 1691 1692
			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
1693 1694 1695
			if (!skb2)
				break;

1696 1697
			net_timestamp_set(skb2);

L
Linus Torvalds 已提交
1698 1699 1700 1701
			/* skb->nh should be correctly
			   set by sender, so that the second statement is
			   just protection against buggy protocols.
			 */
1702
			skb_reset_mac_header(skb2);
L
Linus Torvalds 已提交
1703

1704
			if (skb_network_header(skb2) < skb2->data ||
1705
			    skb2->network_header > skb2->tail) {
1706 1707 1708
				net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
						     ntohs(skb2->protocol),
						     dev->name);
1709
				skb_reset_network_header(skb2);
L
Linus Torvalds 已提交
1710 1711
			}

1712
			skb2->transport_header = skb2->network_header;
L
Linus Torvalds 已提交
1713
			skb2->pkt_type = PACKET_OUTGOING;
1714
			pt_prev = ptype;
L
Linus Torvalds 已提交
1715 1716
		}
	}
1717 1718
	if (pt_prev)
		pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
L
Linus Torvalds 已提交
1719 1720 1721
	rcu_read_unlock();
}

1722 1723
/**
 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734
 * @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
1735
static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1736 1737 1738 1739 1740 1741
{
	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) {
1742
		pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1743 1744 1745 1746 1747 1748 1749 1750 1751 1752
		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) {
1753 1754
			pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
				i, q);
1755 1756 1757 1758 1759
			netdev_set_prio_tc_map(dev, i, 0);
		}
	}
}

1760 1761 1762 1763
/*
 * 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.
 */
1764
int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
1765
{
T
Tom Herbert 已提交
1766 1767
	int rc;

1768 1769
	if (txq < 1 || txq > dev->num_tx_queues)
		return -EINVAL;
1770

1771 1772
	if (dev->reg_state == NETREG_REGISTERED ||
	    dev->reg_state == NETREG_UNREGISTERING) {
1773 1774
		ASSERT_RTNL();

T
Tom Herbert 已提交
1775 1776
		rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
						  txq);
T
Tom Herbert 已提交
1777 1778 1779
		if (rc)
			return rc;

1780 1781 1782
		if (dev->num_tc)
			netif_setup_tc(dev, txq);

1783 1784
		if (txq < dev->real_num_tx_queues)
			qdisc_reset_all_tx_gt(dev, txq);
1785
	}
1786 1787 1788

	dev->real_num_tx_queues = txq;
	return 0;
1789 1790
}
EXPORT_SYMBOL(netif_set_real_num_tx_queues);
1791

1792 1793 1794 1795 1796 1797 1798 1799
#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
1800 1801
 *	negative error code.  If called before registration, it always
 *	succeeds.
1802 1803 1804 1805 1806
 */
int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
{
	int rc;

T
Tom Herbert 已提交
1807 1808 1809
	if (rxq < 1 || rxq > dev->num_rx_queues)
		return -EINVAL;

1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824
	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

1825 1826
/**
 * netif_get_num_default_rss_queues - default number of RSS queues
1827 1828 1829 1830
 *
 * This routine should set an upper limit on the number of RSS queues
 * used by default by multiqueue devices.
 */
1831
int netif_get_num_default_rss_queues(void)
1832 1833 1834 1835 1836
{
	return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
}
EXPORT_SYMBOL(netif_get_num_default_rss_queues);

1837
static inline void __netif_reschedule(struct Qdisc *q)
1838
{
1839 1840
	struct softnet_data *sd;
	unsigned long flags;
1841

1842 1843
	local_irq_save(flags);
	sd = &__get_cpu_var(softnet_data);
1844 1845 1846
	q->next_sched = NULL;
	*sd->output_queue_tailp = q;
	sd->output_queue_tailp = &q->next_sched;
1847 1848 1849 1850 1851 1852 1853 1854
	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);
1855 1856 1857
}
EXPORT_SYMBOL(__netif_schedule);

1858
void dev_kfree_skb_irq(struct sk_buff *skb)
1859
{
1860
	if (atomic_dec_and_test(&skb->users)) {
1861 1862
		struct softnet_data *sd;
		unsigned long flags;
1863

1864 1865 1866 1867 1868 1869 1870
		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);
	}
1871
}
1872
EXPORT_SYMBOL(dev_kfree_skb_irq);
1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883

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);


1884 1885 1886 1887 1888 1889
/**
 * netif_device_detach - mark device as removed
 * @dev: network device
 *
 * Mark device as removed from system and therefore no longer available.
 */
1890 1891 1892 1893
void netif_device_detach(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
1894
		netif_tx_stop_all_queues(dev);
1895 1896 1897 1898
	}
}
EXPORT_SYMBOL(netif_device_detach);

1899 1900 1901 1902 1903 1904
/**
 * netif_device_attach - mark device as attached
 * @dev: network device
 *
 * Mark device as attached from system and restart if needed.
 */
1905 1906 1907 1908
void netif_device_attach(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
1909
		netif_tx_wake_all_queues(dev);
1910
		__netdev_watchdog_up(dev);
1911 1912 1913 1914
	}
}
EXPORT_SYMBOL(netif_device_attach);

1915 1916
static void skb_warn_bad_offload(const struct sk_buff *skb)
{
1917
	static const netdev_features_t null_features = 0;
1918 1919 1920 1921 1922 1923 1924 1925
	struct net_device *dev = skb->dev;
	const char *driver = "";

	if (dev && dev->dev.parent)
		driver = dev_driver_string(dev->dev.parent);

	WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
	     "gso_type=%d ip_summed=%d\n",
1926 1927
	     driver, dev ? &dev->features : &null_features,
	     skb->sk ? &skb->sk->sk_route_caps : &null_features,
1928 1929 1930 1931
	     skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
	     skb_shinfo(skb)->gso_type, skb->ip_summed);
}

L
Linus Torvalds 已提交
1932 1933 1934 1935
/*
 * Invalidate hardware checksum when packet is to be mangled, and
 * complete checksum manually on outgoing path.
 */
1936
int skb_checksum_help(struct sk_buff *skb)
L
Linus Torvalds 已提交
1937
{
1938
	__wsum csum;
1939
	int ret = 0, offset;
L
Linus Torvalds 已提交
1940

1941
	if (skb->ip_summed == CHECKSUM_COMPLETE)
1942 1943 1944
		goto out_set_summed;

	if (unlikely(skb_shinfo(skb)->gso_size)) {
1945 1946
		skb_warn_bad_offload(skb);
		return -EINVAL;
L
Linus Torvalds 已提交
1947 1948
	}

1949
	offset = skb_checksum_start_offset(skb);
1950 1951 1952 1953 1954 1955 1956 1957
	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
1958 1959 1960 1961 1962
		ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
		if (ret)
			goto out;
	}

1963
	*(__sum16 *)(skb->data + offset) = csum_fold(csum);
1964
out_set_summed:
L
Linus Torvalds 已提交
1965
	skb->ip_summed = CHECKSUM_NONE;
1966
out:
L
Linus Torvalds 已提交
1967 1968
	return ret;
}
E
Eric Dumazet 已提交
1969
EXPORT_SYMBOL(skb_checksum_help);
L
Linus Torvalds 已提交
1970

1971 1972 1973
/**
 *	skb_gso_segment - Perform segmentation on skb.
 *	@skb: buffer to segment
1974
 *	@features: features for the output path (see dev->features)
1975 1976
 *
 *	This function segments the given skb and returns a list of segments.
1977 1978 1979
 *
 *	It may return NULL if the skb requires no segmentation.  This is
 *	only possible when GSO is used for verifying header integrity.
1980
 */
1981 1982
struct sk_buff *skb_gso_segment(struct sk_buff *skb,
	netdev_features_t features)
1983 1984 1985
{
	struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
	struct packet_type *ptype;
A
Al Viro 已提交
1986
	__be16 type = skb->protocol;
1987
	int vlan_depth = ETH_HLEN;
1988
	int err;
1989

1990 1991
	while (type == htons(ETH_P_8021Q)) {
		struct vlan_hdr *vh;
1992

1993
		if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN)))
1994 1995
			return ERR_PTR(-EINVAL);

1996 1997 1998
		vh = (struct vlan_hdr *)(skb->data + vlan_depth);
		type = vh->h_vlan_encapsulated_proto;
		vlan_depth += VLAN_HLEN;
1999 2000
	}

2001
	skb_reset_mac_header(skb);
2002
	skb->mac_len = skb->network_header - skb->mac_header;
2003 2004
	__skb_pull(skb, skb->mac_len);

2005
	if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
2006
		skb_warn_bad_offload(skb);
2007

2008 2009 2010 2011 2012
		if (skb_header_cloned(skb) &&
		    (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
			return ERR_PTR(err);
	}

2013
	rcu_read_lock();
2014 2015
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2016
		if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
2017
			if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
2018 2019 2020 2021
				err = ptype->gso_send_check(skb);
				segs = ERR_PTR(err);
				if (err || skb_gso_ok(skb, features))
					break;
2022 2023
				__skb_push(skb, (skb->data -
						 skb_network_header(skb)));
2024
			}
2025
			segs = ptype->gso_segment(skb, features);
2026 2027 2028 2029 2030
			break;
		}
	}
	rcu_read_unlock();

2031
	__skb_push(skb, skb->data - skb_mac_header(skb));
2032

2033 2034 2035 2036
	return segs;
}
EXPORT_SYMBOL(skb_gso_segment);

2037 2038 2039 2040 2041
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG
void netdev_rx_csum_fault(struct net_device *dev)
{
	if (net_ratelimit()) {
2042
		pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
2043 2044 2045 2046 2047 2048
		dump_stack();
	}
}
EXPORT_SYMBOL(netdev_rx_csum_fault);
#endif

L
Linus Torvalds 已提交
2049 2050 2051 2052 2053
/* 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
2054
static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
L
Linus Torvalds 已提交
2055
{
2056
#ifdef CONFIG_HIGHMEM
L
Linus Torvalds 已提交
2057
	int i;
2058
	if (!(dev->features & NETIF_F_HIGHDMA)) {
2059 2060 2061
		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)))
2062
				return 1;
2063
		}
2064
	}
L
Linus Torvalds 已提交
2065

2066 2067
	if (PCI_DMA_BUS_IS_PHYS) {
		struct device *pdev = dev->dev.parent;
L
Linus Torvalds 已提交
2068

E
Eric Dumazet 已提交
2069 2070
		if (!pdev)
			return 0;
2071
		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2072 2073
			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
			dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2074 2075 2076 2077
			if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
				return 1;
		}
	}
2078
#endif
L
Linus Torvalds 已提交
2079 2080 2081
	return 0;
}

2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107
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
2108
 *	@features: device features as applicable to this skb
2109 2110 2111 2112
 *
 *	This function segments the given skb and stores the list of segments
 *	in skb->next.
 */
2113
static int dev_gso_segment(struct sk_buff *skb, netdev_features_t features)
2114 2115
{
	struct sk_buff *segs;
2116 2117 2118 2119 2120 2121

	segs = skb_gso_segment(skb, features);

	/* Verifying header integrity only. */
	if (!segs)
		return 0;
2122

2123
	if (IS_ERR(segs))
2124 2125 2126 2127 2128 2129 2130 2131 2132
		return PTR_ERR(segs);

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

	return 0;
}

2133
static bool can_checksum_protocol(netdev_features_t features, __be16 protocol)
2134 2135 2136 2137 2138 2139 2140 2141 2142 2143
{
	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)));
}

2144 2145
static netdev_features_t harmonize_features(struct sk_buff *skb,
	__be16 protocol, netdev_features_t features)
2146
{
2147
	if (!can_checksum_protocol(features, protocol)) {
2148 2149 2150 2151 2152 2153 2154 2155 2156
		features &= ~NETIF_F_ALL_CSUM;
		features &= ~NETIF_F_SG;
	} else if (illegal_highdma(skb->dev, skb)) {
		features &= ~NETIF_F_SG;
	}

	return features;
}

2157
netdev_features_t netif_skb_features(struct sk_buff *skb)
2158 2159
{
	__be16 protocol = skb->protocol;
2160
	netdev_features_t features = skb->dev->features;
2161

2162 2163 2164
	if (skb_shinfo(skb)->gso_segs > skb->dev->gso_max_segs)
		features &= ~NETIF_F_GSO_MASK;

2165 2166 2167
	if (protocol == htons(ETH_P_8021Q)) {
		struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
		protocol = veh->h_vlan_encapsulated_proto;
2168 2169 2170
	} else if (!vlan_tx_tag_present(skb)) {
		return harmonize_features(skb, protocol, features);
	}
2171

2172
	features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX);
2173 2174 2175 2176 2177

	if (protocol != htons(ETH_P_8021Q)) {
		return harmonize_features(skb, protocol, features);
	} else {
		features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST |
2178
				NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX;
2179 2180
		return harmonize_features(skb, protocol, features);
	}
2181
}
2182
EXPORT_SYMBOL(netif_skb_features);
2183

2184 2185 2186
/*
 * Returns true if either:
 *	1. skb has frag_list and the device doesn't support FRAGLIST, or
2187
 *	2. skb is fragmented and the device does not support SG.
2188 2189
 */
static inline int skb_needs_linearize(struct sk_buff *skb,
2190
				      int features)
2191
{
2192 2193 2194
	return skb_is_nonlinear(skb) &&
			((skb_has_frag_list(skb) &&
				!(features & NETIF_F_FRAGLIST)) ||
2195
			(skb_shinfo(skb)->nr_frags &&
2196
				!(features & NETIF_F_SG)));
2197 2198
}

2199 2200
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
			struct netdev_queue *txq)
2201
{
2202
	const struct net_device_ops *ops = dev->netdev_ops;
2203
	int rc = NETDEV_TX_OK;
2204
	unsigned int skb_len;
2205

2206
	if (likely(!skb->next)) {
2207
		netdev_features_t features;
2208

2209
		/*
L
Lucas De Marchi 已提交
2210
		 * If device doesn't need skb->dst, release it right now while
2211 2212
		 * its hot in this cpu cache
		 */
E
Eric Dumazet 已提交
2213 2214 2215
		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
			skb_dst_drop(skb);

2216 2217 2218
		if (!list_empty(&ptype_all))
			dev_queue_xmit_nit(skb, dev);

2219 2220
		features = netif_skb_features(skb);

2221
		if (vlan_tx_tag_present(skb) &&
2222
		    !(features & NETIF_F_HW_VLAN_TX)) {
2223 2224 2225 2226 2227 2228 2229
			skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb));
			if (unlikely(!skb))
				goto out;

			skb->vlan_tci = 0;
		}

2230
		if (netif_needs_gso(skb, features)) {
2231
			if (unlikely(dev_gso_segment(skb, features)))
2232 2233 2234
				goto out_kfree_skb;
			if (skb->next)
				goto gso;
2235
		} else {
2236
			if (skb_needs_linearize(skb, features) &&
2237 2238 2239 2240 2241 2242 2243 2244
			    __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) {
2245 2246
				skb_set_transport_header(skb,
					skb_checksum_start_offset(skb));
2247
				if (!(features & NETIF_F_ALL_CSUM) &&
2248 2249 2250
				     skb_checksum_help(skb))
					goto out_kfree_skb;
			}
2251 2252
		}

2253
		skb_len = skb->len;
2254
		rc = ops->ndo_start_xmit(skb, dev);
2255
		trace_net_dev_xmit(skb, rc, dev, skb_len);
2256
		if (rc == NETDEV_TX_OK)
E
Eric Dumazet 已提交
2257
			txq_trans_update(txq);
2258
		return rc;
2259 2260
	}

2261
gso:
2262 2263 2264 2265 2266
	do {
		struct sk_buff *nskb = skb->next;

		skb->next = nskb->next;
		nskb->next = NULL;
2267 2268

		/*
L
Lucas De Marchi 已提交
2269
		 * If device doesn't need nskb->dst, release it right now while
2270 2271 2272 2273 2274
		 * its hot in this cpu cache
		 */
		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
			skb_dst_drop(nskb);

2275
		skb_len = nskb->len;
2276
		rc = ops->ndo_start_xmit(nskb, dev);
2277
		trace_net_dev_xmit(nskb, rc, dev, skb_len);
2278
		if (unlikely(rc != NETDEV_TX_OK)) {
2279 2280
			if (rc & ~NETDEV_TX_MASK)
				goto out_kfree_gso_skb;
2281
			nskb->next = skb->next;
2282 2283 2284
			skb->next = nskb;
			return rc;
		}
E
Eric Dumazet 已提交
2285
		txq_trans_update(txq);
2286
		if (unlikely(netif_xmit_stopped(txq) && skb->next))
2287
			return NETDEV_TX_BUSY;
2288
	} while (skb->next);
2289

2290 2291 2292
out_kfree_gso_skb:
	if (likely(skb->next == NULL))
		skb->destructor = DEV_GSO_CB(skb)->destructor;
2293 2294
out_kfree_skb:
	kfree_skb(skb);
2295
out:
2296
	return rc;
2297 2298
}

T
Tom Herbert 已提交
2299
static u32 hashrnd __read_mostly;
D
David S. Miller 已提交
2300

2301 2302 2303 2304 2305 2306
/*
 * 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)
2307
{
2308
	u32 hash;
2309 2310
	u16 qoffset = 0;
	u16 qcount = num_tx_queues;
D
David S. Miller 已提交
2311

2312 2313
	if (skb_rx_queue_recorded(skb)) {
		hash = skb_get_rx_queue(skb);
2314 2315
		while (unlikely(hash >= num_tx_queues))
			hash -= num_tx_queues;
2316 2317
		return hash;
	}
2318

2319 2320 2321 2322 2323 2324
	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;
	}

2325
	if (skb->sk && skb->sk->sk_hash)
2326
		hash = skb->sk->sk_hash;
2327
	else
E
Eric Dumazet 已提交
2328
		hash = (__force u16) skb->protocol;
T
Tom Herbert 已提交
2329
	hash = jhash_1word(hash, hashrnd);
D
David S. Miller 已提交
2330

2331
	return (u16) (((u64) hash * qcount) >> 32) + qoffset;
2332
}
2333
EXPORT_SYMBOL(__skb_tx_hash);
2334

2335 2336 2337
static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
{
	if (unlikely(queue_index >= dev->real_num_tx_queues)) {
2338 2339 2340
		net_warn_ratelimited("%s selects TX queue %d, but real number of TX queues is %d\n",
				     dev->name, queue_index,
				     dev->real_num_tx_queues);
2341 2342 2343 2344 2345
		return 0;
	}
	return queue_index;
}

T
Tom Herbert 已提交
2346 2347
static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
{
T
Tom Herbert 已提交
2348
#ifdef CONFIG_XPS
T
Tom Herbert 已提交
2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383
	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
}

2384 2385 2386
static struct netdev_queue *dev_pick_tx(struct net_device *dev,
					struct sk_buff *skb)
{
2387
	int queue_index;
2388
	const struct net_device_ops *ops = dev->netdev_ops;
2389

2390 2391 2392
	if (dev->real_num_tx_queues == 1)
		queue_index = 0;
	else if (ops->ndo_select_queue) {
2393 2394 2395 2396 2397
		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);
2398

2399 2400 2401
		if (queue_index < 0 || skb->ooo_okay ||
		    queue_index >= dev->real_num_tx_queues) {
			int old_index = queue_index;
2402

T
Tom Herbert 已提交
2403 2404 2405
			queue_index = get_xps_queue(dev, skb);
			if (queue_index < 0)
				queue_index = skb_tx_hash(dev, skb);
2406 2407 2408 2409

			if (queue_index != old_index && sk) {
				struct dst_entry *dst =
				    rcu_dereference_check(sk->sk_dst_cache, 1);
E
Eric Dumazet 已提交
2410 2411 2412 2413

				if (dst && skb_dst(skb) == dst)
					sk_tx_queue_set(sk, queue_index);
			}
2414 2415
		}
	}
2416

2417 2418
	skb_set_queue_mapping(skb, queue_index);
	return netdev_get_tx_queue(dev, queue_index);
2419 2420
}

2421 2422 2423 2424 2425
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
2426
	bool contended;
2427 2428
	int rc;

E
Eric Dumazet 已提交
2429 2430
	qdisc_skb_cb(skb)->pkt_len = skb->len;
	qdisc_calculate_pkt_len(skb, q);
2431 2432 2433 2434 2435 2436
	/*
	 * 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
2437
	contended = qdisc_is_running(q);
2438 2439 2440
	if (unlikely(contended))
		spin_lock(&q->busylock);

2441 2442 2443 2444 2445
	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) &&
2446
		   qdisc_run_begin(q)) {
2447 2448 2449 2450 2451
		/*
		 * 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
2452 2453
		if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE))
			skb_dst_force(skb);
2454 2455 2456

		qdisc_bstats_update(q, skb);

2457 2458 2459 2460 2461
		if (sch_direct_xmit(skb, q, dev, txq, root_lock)) {
			if (unlikely(contended)) {
				spin_unlock(&q->busylock);
				contended = false;
			}
2462
			__qdisc_run(q);
2463
		} else
2464
			qdisc_run_end(q);
2465 2466 2467

		rc = NET_XMIT_SUCCESS;
	} else {
E
Eric Dumazet 已提交
2468
		skb_dst_force(skb);
E
Eric Dumazet 已提交
2469
		rc = q->enqueue(skb, q) & NET_XMIT_MASK;
2470 2471 2472 2473 2474 2475 2476
		if (qdisc_run_begin(q)) {
			if (unlikely(contended)) {
				spin_unlock(&q->busylock);
				contended = false;
			}
			__qdisc_run(q);
		}
2477 2478
	}
	spin_unlock(root_lock);
2479 2480
	if (unlikely(contended))
		spin_unlock(&q->busylock);
2481 2482 2483
	return rc;
}

2484 2485 2486
#if IS_ENABLED(CONFIG_NETPRIO_CGROUP)
static void skb_update_prio(struct sk_buff *skb)
{
I
Igor Maravic 已提交
2487
	struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);
2488

2489 2490 2491 2492 2493 2494
	if (!skb->priority && skb->sk && map) {
		unsigned int prioidx = skb->sk->sk_cgrp_prioidx;

		if (prioidx < map->priomap_len)
			skb->priority = map->priomap[prioidx];
	}
2495 2496 2497 2498 2499
}
#else
#define skb_update_prio(skb)
#endif

2500
static DEFINE_PER_CPU(int, xmit_recursion);
2501
#define RECURSION_LIMIT 10
2502

2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519
/**
 *	dev_loopback_xmit - loop back @skb
 *	@skb: buffer to transmit
 */
int dev_loopback_xmit(struct sk_buff *skb)
{
	skb_reset_mac_header(skb);
	__skb_pull(skb, skb_network_offset(skb));
	skb->pkt_type = PACKET_LOOPBACK;
	skb->ip_summed = CHECKSUM_UNNECESSARY;
	WARN_ON(!skb_dst(skb));
	skb_dst_force(skb);
	netif_rx_ni(skb);
	return 0;
}
EXPORT_SYMBOL(dev_loopback_xmit);

2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544
/**
 *	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
2545 2546 2547
int dev_queue_xmit(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
2548
	struct netdev_queue *txq;
L
Linus Torvalds 已提交
2549 2550 2551
	struct Qdisc *q;
	int rc = -ENOMEM;

2552 2553
	/* Disable soft irqs for various locks below. Also
	 * stops preemption for RCU.
L
Linus Torvalds 已提交
2554
	 */
2555
	rcu_read_lock_bh();
L
Linus Torvalds 已提交
2556

2557 2558
	skb_update_prio(skb);

2559
	txq = dev_pick_tx(dev, skb);
2560
	q = rcu_dereference_bh(txq->qdisc);
2561

L
Linus Torvalds 已提交
2562
#ifdef CONFIG_NET_CLS_ACT
E
Eric Dumazet 已提交
2563
	skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
L
Linus Torvalds 已提交
2564
#endif
2565
	trace_net_dev_queue(skb);
L
Linus Torvalds 已提交
2566
	if (q->enqueue) {
2567
		rc = __dev_xmit_skb(skb, q, dev, txq);
2568
		goto out;
L
Linus Torvalds 已提交
2569 2570 2571 2572 2573
	}

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

H
Herbert Xu 已提交
2574 2575
	   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
2576 2577 2578 2579 2580 2581 2582 2583 2584 2585
	   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 */

2586
		if (txq->xmit_lock_owner != cpu) {
L
Linus Torvalds 已提交
2587

2588 2589 2590
			if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT)
				goto recursion_alert;

2591
			HARD_TX_LOCK(dev, txq, cpu);
L
Linus Torvalds 已提交
2592

2593
			if (!netif_xmit_stopped(txq)) {
2594
				__this_cpu_inc(xmit_recursion);
2595
				rc = dev_hard_start_xmit(skb, dev, txq);
2596
				__this_cpu_dec(xmit_recursion);
2597
				if (dev_xmit_complete(rc)) {
2598
					HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
2599 2600 2601
					goto out;
				}
			}
2602
			HARD_TX_UNLOCK(dev, txq);
2603 2604
			net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
					     dev->name);
L
Linus Torvalds 已提交
2605 2606
		} else {
			/* Recursion is detected! It is possible,
2607 2608 2609
			 * unfortunately
			 */
recursion_alert:
2610 2611
			net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
					     dev->name);
L
Linus Torvalds 已提交
2612 2613 2614 2615
		}
	}

	rc = -ENETDOWN;
2616
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
2617 2618 2619 2620

	kfree_skb(skb);
	return rc;
out:
2621
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
2622 2623
	return rc;
}
E
Eric Dumazet 已提交
2624
EXPORT_SYMBOL(dev_queue_xmit);
L
Linus Torvalds 已提交
2625 2626 2627 2628 2629 2630


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

2631
int netdev_max_backlog __read_mostly = 1000;
E
Eric Dumazet 已提交
2632
int netdev_tstamp_prequeue __read_mostly = 1;
2633 2634
int netdev_budget __read_mostly = 300;
int weight_p __read_mostly = 64;            /* old backlog weight */
L
Linus Torvalds 已提交
2635

E
Eric Dumazet 已提交
2636 2637 2638 2639 2640 2641 2642 2643
/* 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
2644
/*
2645
 * __skb_get_rxhash: calculate a flow hash based on src/dst addresses
2646 2647 2648
 * 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
2649
 */
2650
void __skb_get_rxhash(struct sk_buff *skb)
T
Tom Herbert 已提交
2651
{
2652 2653
	struct flow_keys keys;
	u32 hash;
2654

2655 2656
	if (!skb_flow_dissect(skb, &keys))
		return;
2657

2658 2659 2660 2661
	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
2662 2663
	}

E
Eric Dumazet 已提交
2664
	/* get a consistent hash (same value on both flow directions) */
2665 2666
	if ((__force u32)keys.dst < (__force u32)keys.src)
		swap(keys.dst, keys.src);
T
Tom Herbert 已提交
2667

2668 2669 2670
	hash = jhash_3words((__force u32)keys.dst,
			    (__force u32)keys.src,
			    (__force u32)keys.ports, hashrnd);
2671 2672 2673
	if (!hash)
		hash = 1;

2674
	skb->rxhash = hash;
2675 2676 2677 2678 2679 2680
}
EXPORT_SYMBOL(__skb_get_rxhash);

#ifdef CONFIG_RPS

/* One global table that all flow-based protocols share. */
E
Eric Dumazet 已提交
2681
struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
2682 2683
EXPORT_SYMBOL(rps_sock_flow_table);

2684
struct static_key rps_needed __read_mostly;
2685

2686 2687 2688 2689
static struct rps_dev_flow *
set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
	    struct rps_dev_flow *rflow, u16 next_cpu)
{
2690
	if (next_cpu != RPS_NO_CPU) {
2691 2692 2693 2694 2695 2696 2697 2698 2699
#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? */
2700 2701
		if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
		    !(dev->features & NETIF_F_NTUPLE))
2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723
			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 =
2724
			per_cpu(softnet_data, next_cpu).input_queue_head;
2725 2726
	}

2727
	rflow->cpu = next_cpu;
2728 2729 2730
	return rflow;
}

2731 2732 2733 2734 2735 2736 2737 2738 2739
/*
 * 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
2740
	struct rps_map *map;
2741 2742 2743 2744 2745 2746 2747
	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);
2748 2749 2750 2751 2752
		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);
2753 2754 2755 2756 2757 2758
			goto done;
		}
		rxqueue = dev->_rx + index;
	} else
		rxqueue = dev->_rx;

E
Eric Dumazet 已提交
2759 2760
	map = rcu_dereference(rxqueue->rps_map);
	if (map) {
2761
		if (map->len == 1 &&
2762
		    !rcu_access_pointer(rxqueue->rps_flow_table)) {
2763 2764 2765 2766 2767
			tcpu = map->cpus[0];
			if (cpu_online(tcpu))
				cpu = tcpu;
			goto done;
		}
2768
	} else if (!rcu_access_pointer(rxqueue->rps_flow_table)) {
2769
		goto done;
2770
	}
2771

2772
	skb_reset_network_header(skb);
2773 2774 2775
	if (!skb_get_rxhash(skb))
		goto done;

T
Tom Herbert 已提交
2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801
	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 -
2802 2803 2804
		      rflow->last_qtail)) >= 0))
			rflow = set_rps_cpu(dev, skb, rflow, next_cpu);

T
Tom Herbert 已提交
2805 2806 2807 2808 2809 2810 2811
		if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) {
			*rflowp = rflow;
			cpu = tcpu;
			goto done;
		}
	}

T
Tom Herbert 已提交
2812
	if (map) {
T
Tom Herbert 已提交
2813
		tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
T
Tom Herbert 已提交
2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824

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

done:
	return cpu;
}

2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864
#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
2865
/* Called from hardirq (IPI) context */
E
Eric Dumazet 已提交
2866
static void rps_trigger_softirq(void *data)
T
Tom Herbert 已提交
2867
{
E
Eric Dumazet 已提交
2868 2869
	struct softnet_data *sd = data;

E
Eric Dumazet 已提交
2870
	____napi_schedule(sd, &sd->backlog);
C
Changli Gao 已提交
2871
	sd->received_rps++;
T
Tom Herbert 已提交
2872
}
E
Eric Dumazet 已提交
2873

T
Tom Herbert 已提交
2874
#endif /* CONFIG_RPS */
T
Tom Herbert 已提交
2875

E
Eric Dumazet 已提交
2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896
/*
 * 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
2897 2898 2899 2900
/*
 * 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
2901 2902
static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
			      unsigned int *qtail)
T
Tom Herbert 已提交
2903
{
E
Eric Dumazet 已提交
2904
	struct softnet_data *sd;
T
Tom Herbert 已提交
2905 2906
	unsigned long flags;

E
Eric Dumazet 已提交
2907
	sd = &per_cpu(softnet_data, cpu);
T
Tom Herbert 已提交
2908 2909 2910

	local_irq_save(flags);

E
Eric Dumazet 已提交
2911
	rps_lock(sd);
2912 2913
	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
2914
enqueue:
E
Eric Dumazet 已提交
2915
			__skb_queue_tail(&sd->input_pkt_queue, skb);
2916
			input_queue_tail_incr_save(sd, qtail);
E
Eric Dumazet 已提交
2917
			rps_unlock(sd);
2918
			local_irq_restore(flags);
T
Tom Herbert 已提交
2919 2920 2921
			return NET_RX_SUCCESS;
		}

2922 2923 2924 2925
		/* 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
2926
			if (!rps_ipi_queued(sd))
E
Eric Dumazet 已提交
2927
				____napi_schedule(sd, &sd->backlog);
T
Tom Herbert 已提交
2928 2929 2930 2931
		}
		goto enqueue;
	}

C
Changli Gao 已提交
2932
	sd->dropped++;
E
Eric Dumazet 已提交
2933
	rps_unlock(sd);
T
Tom Herbert 已提交
2934 2935 2936

	local_irq_restore(flags);

2937
	atomic_long_inc(&skb->dev->rx_dropped);
T
Tom Herbert 已提交
2938 2939 2940
	kfree_skb(skb);
	return NET_RX_DROP;
}
L
Linus Torvalds 已提交
2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958

/**
 *	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)
{
2959
	int ret;
L
Linus Torvalds 已提交
2960 2961 2962 2963 2964

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

2965
	net_timestamp_check(netdev_tstamp_prequeue, skb);
L
Linus Torvalds 已提交
2966

2967
	trace_netif_rx(skb);
E
Eric Dumazet 已提交
2968
#ifdef CONFIG_RPS
2969
	if (static_key_false(&rps_needed)) {
T
Tom Herbert 已提交
2970
		struct rps_dev_flow voidflow, *rflow = &voidflow;
2971 2972
		int cpu;

2973
		preempt_disable();
2974
		rcu_read_lock();
T
Tom Herbert 已提交
2975 2976

		cpu = get_rps_cpu(skb->dev, skb, &rflow);
2977 2978
		if (cpu < 0)
			cpu = smp_processor_id();
T
Tom Herbert 已提交
2979 2980 2981

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

2982
		rcu_read_unlock();
2983
		preempt_enable();
2984 2985
	} else
#endif
T
Tom Herbert 已提交
2986 2987 2988 2989 2990
	{
		unsigned int qtail;
		ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
		put_cpu();
	}
2991
	return ret;
L
Linus Torvalds 已提交
2992
}
E
Eric Dumazet 已提交
2993
EXPORT_SYMBOL(netif_rx);
L
Linus Torvalds 已提交
2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024

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;

3025
			WARN_ON(atomic_read(&skb->users));
3026
			trace_kfree_skb(skb, net_tx_action);
L
Linus Torvalds 已提交
3027 3028 3029 3030 3031
			__kfree_skb(skb);
		}
	}

	if (sd->output_queue) {
3032
		struct Qdisc *head;
L
Linus Torvalds 已提交
3033 3034 3035 3036

		local_irq_disable();
		head = sd->output_queue;
		sd->output_queue = NULL;
3037
		sd->output_queue_tailp = &sd->output_queue;
L
Linus Torvalds 已提交
3038 3039 3040
		local_irq_enable();

		while (head) {
3041 3042 3043
			struct Qdisc *q = head;
			spinlock_t *root_lock;

L
Linus Torvalds 已提交
3044 3045
			head = head->next_sched;

3046
			root_lock = qdisc_lock(q);
3047
			if (spin_trylock(root_lock)) {
3048 3049 3050
				smp_mb__before_clear_bit();
				clear_bit(__QDISC_STATE_SCHED,
					  &q->state);
3051 3052
				qdisc_run(q);
				spin_unlock(root_lock);
L
Linus Torvalds 已提交
3053
			} else {
3054
				if (!test_bit(__QDISC_STATE_DEACTIVATED,
3055
					      &q->state)) {
3056
					__netif_reschedule(q);
3057 3058 3059 3060 3061
				} else {
					smp_mb__before_clear_bit();
					clear_bit(__QDISC_STATE_SCHED,
						  &q->state);
				}
L
Linus Torvalds 已提交
3062 3063 3064 3065 3066
			}
		}
	}
}

3067 3068
#if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
    (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3069 3070 3071
/* This hook is defined here for ATM LANE */
int (*br_fdb_test_addr_hook)(struct net_device *dev,
			     unsigned char *addr) __read_mostly;
3072
EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3073
#endif
L
Linus Torvalds 已提交
3074 3075 3076 3077 3078 3079

#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
3080 3081
 * 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
3082 3083
 *
 */
3084
static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq)
L
Linus Torvalds 已提交
3085 3086
{
	struct net_device *dev = skb->dev;
3087
	u32 ttl = G_TC_RTTL(skb->tc_verd);
3088 3089
	int result = TC_ACT_OK;
	struct Qdisc *q;
3090

3091
	if (unlikely(MAX_RED_LOOP < ttl++)) {
3092 3093
		net_warn_ratelimited("Redir loop detected Dropping packet (%d->%d)\n",
				     skb->skb_iif, dev->ifindex);
3094 3095
		return TC_ACT_SHOT;
	}
L
Linus Torvalds 已提交
3096

3097 3098
	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
3099

3100
	q = rxq->qdisc;
3101
	if (q != &noop_qdisc) {
3102
		spin_lock(qdisc_lock(q));
3103 3104
		if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
			result = qdisc_enqueue_root(skb, q);
3105 3106
		spin_unlock(qdisc_lock(q));
	}
3107 3108 3109

	return result;
}
3110

3111 3112 3113 3114
static inline struct sk_buff *handle_ing(struct sk_buff *skb,
					 struct packet_type **pt_prev,
					 int *ret, struct net_device *orig_dev)
{
3115 3116 3117
	struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue);

	if (!rxq || rxq->qdisc == &noop_qdisc)
3118
		goto out;
L
Linus Torvalds 已提交
3119

3120 3121 3122
	if (*pt_prev) {
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
		*pt_prev = NULL;
L
Linus Torvalds 已提交
3123 3124
	}

3125
	switch (ing_filter(skb, rxq)) {
3126 3127 3128 3129 3130 3131 3132 3133 3134
	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
3135 3136 3137
}
#endif

3138 3139 3140 3141
/**
 *	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
3142
 *	@rx_handler_data: data pointer that is used by rx handler
3143 3144 3145 3146 3147 3148
 *
 *	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.
3149 3150
 *
 *	For a general description of rx_handler, see enum rx_handler_result.
3151 3152
 */
int netdev_rx_handler_register(struct net_device *dev,
J
Jiri Pirko 已提交
3153 3154
			       rx_handler_func_t *rx_handler,
			       void *rx_handler_data)
3155 3156 3157 3158 3159 3160
{
	ASSERT_RTNL();

	if (dev->rx_handler)
		return -EBUSY;

J
Jiri Pirko 已提交
3161
	rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179
	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();
3180 3181
	RCU_INIT_POINTER(dev->rx_handler, NULL);
	RCU_INIT_POINTER(dev->rx_handler_data, NULL);
3182 3183 3184
}
EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);

3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201
/*
 * Limit the use of PFMEMALLOC reserves to those protocols that implement
 * the special handling of PFMEMALLOC skbs.
 */
static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
{
	switch (skb->protocol) {
	case __constant_htons(ETH_P_ARP):
	case __constant_htons(ETH_P_IP):
	case __constant_htons(ETH_P_IPV6):
	case __constant_htons(ETH_P_8021Q):
		return true;
	default:
		return false;
	}
}

3202
static int __netif_receive_skb(struct sk_buff *skb)
L
Linus Torvalds 已提交
3203 3204
{
	struct packet_type *ptype, *pt_prev;
3205
	rx_handler_func_t *rx_handler;
D
David S. Miller 已提交
3206
	struct net_device *orig_dev;
3207
	struct net_device *null_or_dev;
3208
	bool deliver_exact = false;
L
Linus Torvalds 已提交
3209
	int ret = NET_RX_DROP;
A
Al Viro 已提交
3210
	__be16 type;
3211
	unsigned long pflags = current->flags;
L
Linus Torvalds 已提交
3212

3213
	net_timestamp_check(!netdev_tstamp_prequeue, skb);
3214

3215
	trace_netif_receive_skb(skb);
3216

3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228
	/*
	 * PFMEMALLOC skbs are special, they should
	 * - be delivered to SOCK_MEMALLOC sockets only
	 * - stay away from userspace
	 * - have bounded memory usage
	 *
	 * Use PF_MEMALLOC as this saves us from propagating the allocation
	 * context down to all allocation sites.
	 */
	if (sk_memalloc_socks() && skb_pfmemalloc(skb))
		current->flags |= PF_MEMALLOC;

L
Linus Torvalds 已提交
3229
	/* if we've gotten here through NAPI, check netpoll */
3230
	if (netpoll_receive_skb(skb))
3231
		goto out;
L
Linus Torvalds 已提交
3232

J
Joe Eykholt 已提交
3233
	orig_dev = skb->dev;
3234

3235
	skb_reset_network_header(skb);
3236
	skb_reset_transport_header(skb);
3237
	skb_reset_mac_len(skb);
L
Linus Torvalds 已提交
3238 3239 3240 3241 3242

	pt_prev = NULL;

	rcu_read_lock();

3243
another_round:
3244
	skb->skb_iif = skb->dev->ifindex;
3245 3246 3247

	__this_cpu_inc(softnet_data.processed);

3248 3249 3250
	if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
		skb = vlan_untag(skb);
		if (unlikely(!skb))
3251
			goto unlock;
3252 3253
	}

L
Linus Torvalds 已提交
3254 3255 3256 3257 3258 3259 3260
#ifdef CONFIG_NET_CLS_ACT
	if (skb->tc_verd & TC_NCLS) {
		skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
		goto ncls;
	}
#endif

3261 3262 3263
	if (sk_memalloc_socks() && skb_pfmemalloc(skb))
		goto skip_taps;

L
Linus Torvalds 已提交
3264
	list_for_each_entry_rcu(ptype, &ptype_all, list) {
3265
		if (!ptype->dev || ptype->dev == skb->dev) {
3266
			if (pt_prev)
D
David S. Miller 已提交
3267
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
3268 3269 3270 3271
			pt_prev = ptype;
		}
	}

3272
skip_taps:
L
Linus Torvalds 已提交
3273
#ifdef CONFIG_NET_CLS_ACT
3274 3275
	skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
	if (!skb)
3276
		goto unlock;
L
Linus Torvalds 已提交
3277 3278 3279
ncls:
#endif

3280 3281 3282 3283
	if (sk_memalloc_socks() && skb_pfmemalloc(skb)
				&& !skb_pfmemalloc_protocol(skb))
		goto drop;

3284
	rx_handler = rcu_dereference(skb->dev->rx_handler);
3285 3286 3287 3288 3289
	if (vlan_tx_tag_present(skb)) {
		if (pt_prev) {
			ret = deliver_skb(skb, pt_prev, orig_dev);
			pt_prev = NULL;
		}
3290
		if (vlan_do_receive(&skb, !rx_handler))
3291 3292
			goto another_round;
		else if (unlikely(!skb))
3293
			goto unlock;
3294 3295
	}

3296 3297 3298 3299 3300
	if (rx_handler) {
		if (pt_prev) {
			ret = deliver_skb(skb, pt_prev, orig_dev);
			pt_prev = NULL;
		}
3301 3302
		switch (rx_handler(&skb)) {
		case RX_HANDLER_CONSUMED:
3303
			goto unlock;
3304
		case RX_HANDLER_ANOTHER:
3305
			goto another_round;
3306 3307 3308 3309 3310 3311 3312
		case RX_HANDLER_EXACT:
			deliver_exact = true;
		case RX_HANDLER_PASS:
			break;
		default:
			BUG();
		}
3313
	}
L
Linus Torvalds 已提交
3314

3315
	/* deliver only exact match when indicated */
3316
	null_or_dev = deliver_exact ? skb->dev : NULL;
3317

L
Linus Torvalds 已提交
3318
	type = skb->protocol;
3319 3320
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
3321
		if (ptype->type == type &&
3322 3323
		    (ptype->dev == null_or_dev || ptype->dev == skb->dev ||
		     ptype->dev == orig_dev)) {
3324
			if (pt_prev)
D
David S. Miller 已提交
3325
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
3326 3327 3328 3329 3330
			pt_prev = ptype;
		}
	}

	if (pt_prev) {
3331 3332 3333 3334
		if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
			ret = -ENOMEM;
		else
			ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
3335
	} else {
3336
drop:
3337
		atomic_long_inc(&skb->dev->rx_dropped);
L
Linus Torvalds 已提交
3338 3339 3340 3341 3342 3343 3344
		kfree_skb(skb);
		/* Jamal, now you will not able to escape explaining
		 * me how you were going to use this. :-)
		 */
		ret = NET_RX_DROP;
	}

3345
unlock:
L
Linus Torvalds 已提交
3346
	rcu_read_unlock();
3347 3348
out:
	tsk_restore_flags(current, pflags, PF_MEMALLOC);
L
Linus Torvalds 已提交
3349 3350
	return ret;
}
T
Tom Herbert 已提交
3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368

/**
 *	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)
{
3369
	net_timestamp_check(netdev_tstamp_prequeue, skb);
E
Eric Dumazet 已提交
3370

3371 3372 3373
	if (skb_defer_rx_timestamp(skb))
		return NET_RX_SUCCESS;

E
Eric Dumazet 已提交
3374
#ifdef CONFIG_RPS
3375
	if (static_key_false(&rps_needed)) {
E
Eric Dumazet 已提交
3376 3377
		struct rps_dev_flow voidflow, *rflow = &voidflow;
		int cpu, ret;
T
Tom Herbert 已提交
3378

E
Eric Dumazet 已提交
3379 3380 3381
		rcu_read_lock();

		cpu = get_rps_cpu(skb->dev, skb, &rflow);
T
Tom Herbert 已提交
3382

E
Eric Dumazet 已提交
3383 3384 3385
		if (cpu >= 0) {
			ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
			rcu_read_unlock();
3386
			return ret;
E
Eric Dumazet 已提交
3387
		}
3388
		rcu_read_unlock();
T
Tom Herbert 已提交
3389
	}
3390
#endif
3391
	return __netif_receive_skb(skb);
T
Tom Herbert 已提交
3392
}
E
Eric Dumazet 已提交
3393
EXPORT_SYMBOL(netif_receive_skb);
L
Linus Torvalds 已提交
3394

E
Eric Dumazet 已提交
3395 3396 3397
/* Network device is going away, flush any packets still pending
 * Called with irqs disabled.
 */
3398
static void flush_backlog(void *arg)
3399
{
3400
	struct net_device *dev = arg;
E
Eric Dumazet 已提交
3401
	struct softnet_data *sd = &__get_cpu_var(softnet_data);
3402 3403
	struct sk_buff *skb, *tmp;

E
Eric Dumazet 已提交
3404
	rps_lock(sd);
3405
	skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
3406
		if (skb->dev == dev) {
E
Eric Dumazet 已提交
3407
			__skb_unlink(skb, &sd->input_pkt_queue);
3408
			kfree_skb(skb);
3409
			input_queue_head_incr(sd);
3410
		}
3411
	}
E
Eric Dumazet 已提交
3412
	rps_unlock(sd);
3413 3414 3415 3416 3417

	skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
		if (skb->dev == dev) {
			__skb_unlink(skb, &sd->process_queue);
			kfree_skb(skb);
3418
			input_queue_head_incr(sd);
3419 3420
		}
	}
3421 3422
}

3423 3424 3425 3426 3427 3428 3429
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;

3430 3431
	if (NAPI_GRO_CB(skb)->count == 1) {
		skb_shinfo(skb)->gso_size = 0;
3432
		goto out;
3433
	}
3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454

	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
3455
inline void napi_gro_flush(struct napi_struct *napi)
3456 3457 3458 3459 3460 3461 3462 3463 3464
{
	struct sk_buff *skb, *next;

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

3465
	napi->gro_count = 0;
3466 3467
	napi->gro_list = NULL;
}
E
Eric Dumazet 已提交
3468
EXPORT_SYMBOL(napi_gro_flush);
3469

3470
enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3471 3472 3473 3474 3475
{
	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
3476
	int same_flow;
3477
	int mac_len;
3478
	enum gro_result ret;
3479

3480
	if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb))
3481 3482
		goto normal;

3483
	if (skb_is_gso(skb) || skb_has_frag_list(skb))
3484 3485
		goto normal;

3486 3487 3488 3489 3490
	rcu_read_lock();
	list_for_each_entry_rcu(ptype, head, list) {
		if (ptype->type != type || ptype->dev || !ptype->gro_receive)
			continue;

3491
		skb_set_network_header(skb, skb_gro_offset(skb));
3492 3493 3494 3495
		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
3496
		NAPI_GRO_CB(skb)->free = 0;
3497 3498 3499 3500 3501 3502 3503 3504 3505

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

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

H
Herbert Xu 已提交
3506
	same_flow = NAPI_GRO_CB(skb)->same_flow;
3507
	ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
H
Herbert Xu 已提交
3508

3509 3510 3511 3512 3513 3514
	if (pp) {
		struct sk_buff *nskb = *pp;

		*pp = nskb->next;
		nskb->next = NULL;
		napi_gro_complete(nskb);
3515
		napi->gro_count--;
3516 3517
	}

H
Herbert Xu 已提交
3518
	if (same_flow)
3519 3520
		goto ok;

3521
	if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3522 3523
		goto normal;

3524
	napi->gro_count++;
3525
	NAPI_GRO_CB(skb)->count = 1;
3526
	skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3527 3528
	skb->next = napi->gro_list;
	napi->gro_list = skb;
3529
	ret = GRO_HELD;
3530

3531
pull:
H
Herbert Xu 已提交
3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542
	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
3543
		skb_frag_size_sub(&skb_shinfo(skb)->frags[0], grow);
H
Herbert Xu 已提交
3544

E
Eric Dumazet 已提交
3545
		if (unlikely(!skb_frag_size(&skb_shinfo(skb)->frags[0]))) {
3546
			skb_frag_unref(skb, 0);
H
Herbert Xu 已提交
3547 3548
			memmove(skb_shinfo(skb)->frags,
				skb_shinfo(skb)->frags + 1,
3549
				--skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t));
H
Herbert Xu 已提交
3550
		}
3551 3552
	}

3553
ok:
3554
	return ret;
3555 3556

normal:
3557 3558
	ret = GRO_NORMAL;
	goto pull;
H
Herbert Xu 已提交
3559
}
3560 3561
EXPORT_SYMBOL(dev_gro_receive);

3562
static inline gro_result_t
3563
__napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3564 3565
{
	struct sk_buff *p;
E
Eric Dumazet 已提交
3566
	unsigned int maclen = skb->dev->hard_header_len;
3567 3568

	for (p = napi->gro_list; p; p = p->next) {
3569 3570 3571
		unsigned long diffs;

		diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
3572
		diffs |= p->vlan_tci ^ skb->vlan_tci;
E
Eric Dumazet 已提交
3573 3574 3575 3576 3577 3578 3579
		if (maclen == ETH_HLEN)
			diffs |= compare_ether_header(skb_mac_header(p),
						      skb_gro_mac_header(skb));
		else if (!diffs)
			diffs = memcmp(skb_mac_header(p),
				       skb_gro_mac_header(skb),
				       maclen);
3580
		NAPI_GRO_CB(p)->same_flow = !diffs;
3581 3582 3583 3584 3585
		NAPI_GRO_CB(p)->flush = 0;
	}

	return dev_gro_receive(napi, skb);
}
H
Herbert Xu 已提交
3586

3587
gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
H
Herbert Xu 已提交
3588
{
3589 3590
	switch (ret) {
	case GRO_NORMAL:
3591 3592 3593
		if (netif_receive_skb(skb))
			ret = GRO_DROP;
		break;
H
Herbert Xu 已提交
3594

3595
	case GRO_DROP:
H
Herbert Xu 已提交
3596 3597
		kfree_skb(skb);
		break;
3598

3599
	case GRO_MERGED_FREE:
3600 3601 3602 3603
		if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD)
			kmem_cache_free(skbuff_head_cache, skb);
		else
			__kfree_skb(skb);
3604 3605
		break;

3606 3607 3608
	case GRO_HELD:
	case GRO_MERGED:
		break;
H
Herbert Xu 已提交
3609 3610
	}

3611
	return ret;
3612 3613 3614
}
EXPORT_SYMBOL(napi_skb_finish);

3615 3616 3617 3618
void skb_gro_reset_offset(struct sk_buff *skb)
{
	NAPI_GRO_CB(skb)->data_offset = 0;
	NAPI_GRO_CB(skb)->frag0 = NULL;
3619
	NAPI_GRO_CB(skb)->frag0_len = 0;
3620

3621
	if (skb->mac_header == skb->tail &&
3622
	    !PageHighMem(skb_frag_page(&skb_shinfo(skb)->frags[0]))) {
3623
		NAPI_GRO_CB(skb)->frag0 =
3624
			skb_frag_address(&skb_shinfo(skb)->frags[0]);
E
Eric Dumazet 已提交
3625
		NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(&skb_shinfo(skb)->frags[0]);
3626
	}
3627 3628 3629
}
EXPORT_SYMBOL(skb_gro_reset_offset);

3630
gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3631
{
3632 3633
	skb_gro_reset_offset(skb);

3634
	return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3635 3636 3637
}
EXPORT_SYMBOL(napi_gro_receive);

S
stephen hemminger 已提交
3638
static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
3639 3640
{
	__skb_pull(skb, skb_headlen(skb));
3641 3642
	/* restore the reserve we had after netdev_alloc_skb_ip_align() */
	skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
3643
	skb->vlan_tci = 0;
H
Herbert Xu 已提交
3644
	skb->dev = napi->dev;
A
Andy Gospodarek 已提交
3645
	skb->skb_iif = 0;
3646 3647 3648 3649

	napi->skb = skb;
}

3650
struct sk_buff *napi_get_frags(struct napi_struct *napi)
H
Herbert Xu 已提交
3651 3652 3653 3654
{
	struct sk_buff *skb = napi->skb;

	if (!skb) {
3655 3656 3657
		skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
		if (skb)
			napi->skb = skb;
3658
	}
3659 3660
	return skb;
}
3661
EXPORT_SYMBOL(napi_get_frags);
3662

3663 3664
gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
			       gro_result_t ret)
3665
{
3666 3667
	switch (ret) {
	case GRO_NORMAL:
3668
	case GRO_HELD:
3669
		skb->protocol = eth_type_trans(skb, skb->dev);
3670

3671 3672 3673 3674
		if (ret == GRO_HELD)
			skb_gro_pull(skb, -ETH_HLEN);
		else if (netif_receive_skb(skb))
			ret = GRO_DROP;
3675
		break;
H
Herbert Xu 已提交
3676

3677 3678 3679 3680
	case GRO_DROP:
	case GRO_MERGED_FREE:
		napi_reuse_skb(napi, skb);
		break;
3681 3682 3683

	case GRO_MERGED:
		break;
3684
	}
H
Herbert Xu 已提交
3685

3686
	return ret;
H
Herbert Xu 已提交
3687
}
3688 3689
EXPORT_SYMBOL(napi_frags_finish);

E
Eric Dumazet 已提交
3690
static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
3691 3692 3693
{
	struct sk_buff *skb = napi->skb;
	struct ethhdr *eth;
3694 3695
	unsigned int hlen;
	unsigned int off;
3696 3697 3698 3699 3700 3701

	napi->skb = NULL;

	skb_reset_mac_header(skb);
	skb_gro_reset_offset(skb);

3702 3703 3704 3705 3706 3707 3708 3709 3710 3711
	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;
		}
3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725
	}

	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;
}

3726
gro_result_t napi_gro_frags(struct napi_struct *napi)
3727
{
3728
	struct sk_buff *skb = napi_frags_skb(napi);
3729 3730

	if (!skb)
3731
		return GRO_DROP;
3732 3733 3734

	return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
}
H
Herbert Xu 已提交
3735 3736
EXPORT_SYMBOL(napi_gro_frags);

3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764
/*
 * 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();
}

3765
static int process_backlog(struct napi_struct *napi, int quota)
L
Linus Torvalds 已提交
3766 3767
{
	int work = 0;
E
Eric Dumazet 已提交
3768
	struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
L
Linus Torvalds 已提交
3769

3770 3771 3772 3773 3774 3775 3776 3777 3778
#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
3779
	napi->weight = weight_p;
3780 3781
	local_irq_disable();
	while (work < quota) {
L
Linus Torvalds 已提交
3782
		struct sk_buff *skb;
3783 3784 3785 3786 3787 3788
		unsigned int qlen;

		while ((skb = __skb_dequeue(&sd->process_queue))) {
			local_irq_enable();
			__netif_receive_skb(skb);
			local_irq_disable();
3789 3790 3791 3792 3793
			input_queue_head_incr(sd);
			if (++work >= quota) {
				local_irq_enable();
				return work;
			}
3794
		}
L
Linus Torvalds 已提交
3795

E
Eric Dumazet 已提交
3796
		rps_lock(sd);
3797
		qlen = skb_queue_len(&sd->input_pkt_queue);
3798
		if (qlen)
3799 3800
			skb_queue_splice_tail_init(&sd->input_pkt_queue,
						   &sd->process_queue);
3801

3802
		if (qlen < quota - work) {
E
Eric Dumazet 已提交
3803 3804 3805 3806 3807 3808 3809 3810 3811 3812
			/*
			 * 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;

3813
			quota = work + qlen;
3814
		}
E
Eric Dumazet 已提交
3815
		rps_unlock(sd);
3816 3817
	}
	local_irq_enable();
L
Linus Torvalds 已提交
3818

3819 3820
	return work;
}
L
Linus Torvalds 已提交
3821

3822 3823
/**
 * __napi_schedule - schedule for receive
3824
 * @n: entry to schedule
3825 3826 3827
 *
 * The entry's receive function will be scheduled to run
 */
H
Harvey Harrison 已提交
3828
void __napi_schedule(struct napi_struct *n)
3829 3830
{
	unsigned long flags;
L
Linus Torvalds 已提交
3831

3832
	local_irq_save(flags);
E
Eric Dumazet 已提交
3833
	____napi_schedule(&__get_cpu_var(softnet_data), n);
3834
	local_irq_restore(flags);
L
Linus Torvalds 已提交
3835
}
3836 3837
EXPORT_SYMBOL(__napi_schedule);

3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870
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);
3871
	napi->gro_count = 0;
3872
	napi->gro_list = NULL;
H
Herbert Xu 已提交
3873
	napi->skb = NULL;
3874 3875 3876 3877
	napi->poll = poll;
	napi->weight = weight;
	list_add(&napi->dev_list, &dev->napi_list);
	napi->dev = dev;
H
Herbert Xu 已提交
3878
#ifdef CONFIG_NETPOLL
3879 3880 3881 3882 3883 3884 3885 3886 3887 3888 3889
	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;

3890
	list_del_init(&napi->dev_list);
3891
	napi_free_frags(napi);
3892 3893 3894 3895 3896 3897 3898 3899

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

	napi->gro_list = NULL;
3900
	napi->gro_count = 0;
3901 3902 3903
}
EXPORT_SYMBOL(netif_napi_del);

L
Linus Torvalds 已提交
3904 3905
static void net_rx_action(struct softirq_action *h)
{
3906
	struct softnet_data *sd = &__get_cpu_var(softnet_data);
3907
	unsigned long time_limit = jiffies + 2;
3908
	int budget = netdev_budget;
3909 3910
	void *have;

L
Linus Torvalds 已提交
3911 3912
	local_irq_disable();

3913
	while (!list_empty(&sd->poll_list)) {
3914 3915
		struct napi_struct *n;
		int work, weight;
L
Linus Torvalds 已提交
3916

3917
		/* If softirq window is exhuasted then punt.
3918 3919
		 * Allow this to run for 2 jiffies since which will allow
		 * an average latency of 1.5/HZ.
3920
		 */
3921
		if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
L
Linus Torvalds 已提交
3922 3923 3924 3925
			goto softnet_break;

		local_irq_enable();

3926 3927 3928 3929 3930
		/* 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.
		 */
3931
		n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
L
Linus Torvalds 已提交
3932

3933 3934 3935 3936
		have = netpoll_poll_lock(n);

		weight = n->weight;

3937 3938 3939 3940
		/* 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
3941
		 * accidentally calling ->poll() when NAPI is not scheduled.
3942 3943
		 */
		work = 0;
3944
		if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3945
			work = n->poll(n, weight);
3946 3947
			trace_napi_poll(n);
		}
3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959

		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.
		 */
3960
		if (unlikely(work == weight)) {
3961 3962 3963 3964 3965
			if (unlikely(napi_disable_pending(n))) {
				local_irq_enable();
				napi_complete(n);
				local_irq_disable();
			} else
3966
				list_move_tail(&n->poll_list, &sd->poll_list);
3967
		}
3968 3969

		netpoll_poll_unlock(have);
L
Linus Torvalds 已提交
3970 3971
	}
out:
3972
	net_rps_action_and_irq_enable(sd);
T
Tom Herbert 已提交
3973

3974 3975 3976 3977 3978
#ifdef CONFIG_NET_DMA
	/*
	 * There may not be any more sk_buffs coming right now, so push
	 * any pending DMA copies to hardware
	 */
3979
	dma_issue_pending_all();
3980
#endif
3981

L
Linus Torvalds 已提交
3982 3983 3984
	return;

softnet_break:
C
Changli Gao 已提交
3985
	sd->time_squeeze++;
L
Linus Torvalds 已提交
3986 3987 3988 3989
	__raise_softirq_irqoff(NET_RX_SOFTIRQ);
	goto out;
}

E
Eric Dumazet 已提交
3990
static gifconf_func_t *gifconf_list[NPROTO];
L
Linus Torvalds 已提交
3991 3992 3993 3994 3995 3996 3997 3998 3999 4000

/**
 *	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
4001
int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
L
Linus Torvalds 已提交
4002 4003 4004 4005 4006 4007
{
	if (family >= NPROTO)
		return -EINVAL;
	gifconf_list[family] = gifconf;
	return 0;
}
E
Eric Dumazet 已提交
4008
EXPORT_SYMBOL(register_gifconf);
L
Linus Torvalds 已提交
4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021


/*
 *	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
 */

4022
static int dev_ifname(struct net *net, struct ifreq __user *arg)
L
Linus Torvalds 已提交
4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033
{
	struct net_device *dev;
	struct ifreq ifr;

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

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

4034 4035
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
L
Linus Torvalds 已提交
4036
	if (!dev) {
4037
		rcu_read_unlock();
L
Linus Torvalds 已提交
4038 4039 4040 4041
		return -ENODEV;
	}

	strcpy(ifr.ifr_name, dev->name);
4042
	rcu_read_unlock();
L
Linus Torvalds 已提交
4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054

	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'.
 */

4055
static int dev_ifconf(struct net *net, char __user *arg)
L
Linus Torvalds 已提交
4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078
{
	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;
4079
	for_each_netdev(net, dev) {
L
Linus Torvalds 已提交
4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092
		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;
			}
		}
4093
	}
L
Linus Torvalds 已提交
4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106

	/*
	 *	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
4107

E
Eric Dumazet 已提交
4108
#define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
4109 4110 4111 4112 4113

#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))

E
Eric Dumazet 已提交
4114
static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
4115 4116 4117 4118 4119
{
	struct net *net = seq_file_net(seq);
	struct net_device *dev;
	struct hlist_node *p;
	struct hlist_head *h;
E
Eric Dumazet 已提交
4120
	unsigned int count = 0, offset = get_offset(*pos);
4121

E
Eric Dumazet 已提交
4122
	h = &net->dev_name_head[get_bucket(*pos)];
4123
	hlist_for_each_entry_rcu(dev, p, h, name_hlist) {
E
Eric Dumazet 已提交
4124
		if (++count == offset)
4125 4126 4127 4128 4129 4130
			return dev;
	}

	return NULL;
}

E
Eric Dumazet 已提交
4131
static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
4132 4133 4134 4135 4136
{
	struct net_device *dev;
	unsigned int bucket;

	do {
E
Eric Dumazet 已提交
4137
		dev = dev_from_same_bucket(seq, pos);
4138 4139 4140
		if (dev)
			return dev;

E
Eric Dumazet 已提交
4141 4142
		bucket = get_bucket(*pos) + 1;
		*pos = set_bucket_offset(bucket, 1);
4143 4144 4145 4146 4147
	} while (bucket < NETDEV_HASHENTRIES);

	return NULL;
}

L
Linus Torvalds 已提交
4148 4149 4150 4151
/*
 *	This is invoked by the /proc filesystem handler to display a device
 *	in detail.
 */
4152
void *dev_seq_start(struct seq_file *seq, loff_t *pos)
4153
	__acquires(RCU)
L
Linus Torvalds 已提交
4154
{
4155
	rcu_read_lock();
4156 4157
	if (!*pos)
		return SEQ_START_TOKEN;
L
Linus Torvalds 已提交
4158

E
Eric Dumazet 已提交
4159
	if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
4160
		return NULL;
L
Linus Torvalds 已提交
4161

E
Eric Dumazet 已提交
4162
	return dev_from_bucket(seq, pos);
L
Linus Torvalds 已提交
4163 4164 4165 4166
}

void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
4167
	++*pos;
E
Eric Dumazet 已提交
4168
	return dev_from_bucket(seq, pos);
L
Linus Torvalds 已提交
4169 4170 4171
}

void dev_seq_stop(struct seq_file *seq, void *v)
4172
	__releases(RCU)
L
Linus Torvalds 已提交
4173
{
4174
	rcu_read_unlock();
L
Linus Torvalds 已提交
4175 4176 4177 4178
}

static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
4179 4180
	struct rtnl_link_stats64 temp;
	const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
L
Linus Torvalds 已提交
4181

4182 4183
	seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
		   "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198
		   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
4199 4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217
}

/*
 *	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
4218
static struct softnet_data *softnet_get_online(loff_t *pos)
L
Linus Torvalds 已提交
4219
{
C
Changli Gao 已提交
4220
	struct softnet_data *sd = NULL;
L
Linus Torvalds 已提交
4221

4222
	while (*pos < nr_cpu_ids)
4223
		if (cpu_online(*pos)) {
C
Changli Gao 已提交
4224
			sd = &per_cpu(softnet_data, *pos);
L
Linus Torvalds 已提交
4225 4226 4227
			break;
		} else
			++*pos;
C
Changli Gao 已提交
4228
	return sd;
L
Linus Torvalds 已提交
4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247
}

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
4248
	struct softnet_data *sd = v;
L
Linus Torvalds 已提交
4249

T
Tom Herbert 已提交
4250
	seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
C
Changli Gao 已提交
4251
		   sd->processed, sd->dropped, sd->time_squeeze, 0,
4252
		   0, 0, 0, 0, /* was fastroute */
C
Changli Gao 已提交
4253
		   sd->cpu_collision, sd->received_rps);
L
Linus Torvalds 已提交
4254 4255 4256
	return 0;
}

4257
static const struct seq_operations dev_seq_ops = {
L
Linus Torvalds 已提交
4258 4259 4260 4261 4262 4263 4264 4265
	.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)
{
4266
	return seq_open_net(inode, file, &dev_seq_ops,
E
Eric Dumazet 已提交
4267
			    sizeof(struct seq_net_private));
4268 4269
}

4270
static const struct file_operations dev_seq_fops = {
L
Linus Torvalds 已提交
4271 4272 4273 4274
	.owner	 = THIS_MODULE,
	.open    = dev_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
4275
	.release = seq_release_net,
L
Linus Torvalds 已提交
4276 4277
};

4278
static const struct seq_operations softnet_seq_ops = {
L
Linus Torvalds 已提交
4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289
	.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);
}

4290
static const struct file_operations softnet_seq_fops = {
L
Linus Torvalds 已提交
4291 4292 4293 4294 4295 4296 4297
	.owner	 = THIS_MODULE,
	.open    = softnet_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release,
};

4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309
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;
	}

4310
	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
4311 4312 4313 4314 4315 4316 4317 4318 4319 4320
		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)
4321
	__acquires(RCU)
4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344
{
	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
4345
		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
4346 4347

	while (nxt == &ptype_base[hash]) {
4348
		if (++hash >= PTYPE_HASH_SIZE)
4349 4350 4351 4352 4353 4354 4355 4356
			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)
4357
	__releases(RCU)
4358 4359 4360 4361 4362 4363 4364 4365 4366 4367
{
	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");
4368
	else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
4369 4370 4371 4372 4373
		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
4374 4375
		seq_printf(seq, " %-8s %pF\n",
			   pt->dev ? pt->dev->name : "", pt->func);
4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389
	}

	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)
{
4390 4391
	return seq_open_net(inode, file, &ptype_seq_ops,
			sizeof(struct seq_net_private));
4392 4393 4394 4395 4396 4397 4398
}

static const struct file_operations ptype_seq_fops = {
	.owner	 = THIS_MODULE,
	.open    = ptype_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
4399
	.release = seq_release_net,
4400 4401 4402
};


4403
static int __net_init dev_proc_net_init(struct net *net)
L
Linus Torvalds 已提交
4404 4405 4406
{
	int rc = -ENOMEM;

4407
	if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
L
Linus Torvalds 已提交
4408
		goto out;
4409
	if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
L
Linus Torvalds 已提交
4410
		goto out_dev;
4411
	if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
4412
		goto out_softnet;
4413

4414
	if (wext_proc_init(net))
4415
		goto out_ptype;
L
Linus Torvalds 已提交
4416 4417 4418
	rc = 0;
out:
	return rc;
4419
out_ptype:
4420
	proc_net_remove(net, "ptype");
L
Linus Torvalds 已提交
4421
out_softnet:
4422
	proc_net_remove(net, "softnet_stat");
L
Linus Torvalds 已提交
4423
out_dev:
4424
	proc_net_remove(net, "dev");
L
Linus Torvalds 已提交
4425 4426
	goto out;
}
4427

4428
static void __net_exit dev_proc_net_exit(struct net *net)
4429 4430 4431 4432 4433 4434 4435 4436
{
	wext_proc_exit(net);

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

4437
static struct pernet_operations __net_initdata dev_proc_ops = {
4438 4439 4440 4441 4442 4443 4444 4445
	.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
4446 4447 4448 4449 4450 4451
#else
#define dev_proc_init() 0
#endif	/* CONFIG_PROC_FS */


/**
J
Jiri Pirko 已提交
4452
 *	netdev_set_master	-	set up master pointer
L
Linus Torvalds 已提交
4453 4454 4455 4456 4457 4458
 *	@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
4459
 *	are adjusted and the function returns zero.
L
Linus Torvalds 已提交
4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473
 */
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;
4474

4475
	if (old)
L
Linus Torvalds 已提交
4476
		dev_put(old);
J
Jiri Pirko 已提交
4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499
	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
4500 4501 4502 4503 4504 4505 4506 4507
	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
4508
EXPORT_SYMBOL(netdev_set_bond_master);
L
Linus Torvalds 已提交
4509

4510 4511
static void dev_change_rx_flags(struct net_device *dev, int flags)
{
4512 4513 4514 4515
	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);
4516 4517
}

4518
static int __dev_set_promiscuity(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
4519
{
4520
	unsigned int old_flags = dev->flags;
4521 4522
	kuid_t uid;
	kgid_t gid;
L
Linus Torvalds 已提交
4523

4524 4525
	ASSERT_RTNL();

4526 4527 4528 4529 4530 4531 4532 4533 4534 4535 4536
	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;
4537 4538
			pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
				dev->name);
4539 4540 4541
			return -EOVERFLOW;
		}
	}
4542
	if (dev->flags != old_flags) {
4543 4544 4545
		pr_info("device %s %s promiscuous mode\n",
			dev->name,
			dev->flags & IFF_PROMISC ? "entered" : "left");
4546 4547
		if (audit_enabled) {
			current_uid_gid(&uid, &gid);
4548 4549 4550 4551 4552 4553
			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),
4554 4555
				from_kuid(&init_user_ns, uid),
				from_kgid(&init_user_ns, gid),
4556
				audit_get_sessionid(current));
4557
		}
4558

4559
		dev_change_rx_flags(dev, IFF_PROMISC);
L
Linus Torvalds 已提交
4560
	}
4561
	return 0;
L
Linus Torvalds 已提交
4562 4563
}

4564 4565 4566 4567 4568 4569 4570 4571 4572
/**
 *	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.
4573
 *	Return 0 if successful or a negative errno code on error.
4574
 */
4575
int dev_set_promiscuity(struct net_device *dev, int inc)
4576
{
4577
	unsigned int old_flags = dev->flags;
4578
	int err;
4579

4580
	err = __dev_set_promiscuity(dev, inc);
4581
	if (err < 0)
4582
		return err;
4583 4584
	if (dev->flags != old_flags)
		dev_set_rx_mode(dev);
4585
	return err;
4586
}
E
Eric Dumazet 已提交
4587
EXPORT_SYMBOL(dev_set_promiscuity);
4588

L
Linus Torvalds 已提交
4589 4590 4591 4592 4593 4594 4595 4596 4597 4598
/**
 *	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.
4599
 *	Return 0 if successful or a negative errno code on error.
L
Linus Torvalds 已提交
4600 4601
 */

4602
int dev_set_allmulti(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
4603
{
4604
	unsigned int old_flags = dev->flags;
L
Linus Torvalds 已提交
4605

4606 4607
	ASSERT_RTNL();

L
Linus Torvalds 已提交
4608
	dev->flags |= IFF_ALLMULTI;
4609 4610 4611 4612 4613 4614 4615 4616 4617 4618
	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;
4619 4620
			pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
				dev->name);
4621 4622 4623
			return -EOVERFLOW;
		}
	}
4624
	if (dev->flags ^ old_flags) {
4625
		dev_change_rx_flags(dev, IFF_ALLMULTI);
4626
		dev_set_rx_mode(dev);
4627
	}
4628
	return 0;
4629
}
E
Eric Dumazet 已提交
4630
EXPORT_SYMBOL(dev_set_allmulti);
4631 4632 4633 4634

/*
 *	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
4635
 *	filtering it is put in promiscuous mode while unicast addresses
4636 4637 4638 4639
 *	are present.
 */
void __dev_set_rx_mode(struct net_device *dev)
{
4640 4641
	const struct net_device_ops *ops = dev->netdev_ops;

4642 4643 4644 4645 4646
	/* dev_open will call this function so the list will stay sane. */
	if (!(dev->flags&IFF_UP))
		return;

	if (!netif_device_present(dev))
4647
		return;
4648

4649
	if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
4650 4651 4652
		/* Unicast addresses changes may only happen under the rtnl,
		 * therefore calling __dev_set_promiscuity here is safe.
		 */
4653
		if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4654
			__dev_set_promiscuity(dev, 1);
4655
			dev->uc_promisc = true;
4656
		} else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4657
			__dev_set_promiscuity(dev, -1);
4658
			dev->uc_promisc = false;
4659 4660
		}
	}
4661 4662 4663

	if (ops->ndo_set_rx_mode)
		ops->ndo_set_rx_mode(dev);
4664 4665 4666 4667
}

void dev_set_rx_mode(struct net_device *dev)
{
4668
	netif_addr_lock_bh(dev);
4669
	__dev_set_rx_mode(dev);
4670
	netif_addr_unlock_bh(dev);
L
Linus Torvalds 已提交
4671 4672
}

4673 4674 4675 4676 4677 4678
/**
 *	dev_get_flags - get flags reported to userspace
 *	@dev: device
 *
 *	Get the combination of flag bits exported through APIs to userspace.
 */
4679
unsigned int dev_get_flags(const struct net_device *dev)
L
Linus Torvalds 已提交
4680
{
4681
	unsigned int flags;
L
Linus Torvalds 已提交
4682 4683 4684

	flags = (dev->flags & ~(IFF_PROMISC |
				IFF_ALLMULTI |
S
Stefan Rompf 已提交
4685 4686 4687
				IFF_RUNNING |
				IFF_LOWER_UP |
				IFF_DORMANT)) |
L
Linus Torvalds 已提交
4688 4689 4690
		(dev->gflags & (IFF_PROMISC |
				IFF_ALLMULTI));

S
Stefan Rompf 已提交
4691 4692 4693 4694 4695 4696 4697 4698
	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
4699 4700 4701

	return flags;
}
E
Eric Dumazet 已提交
4702
EXPORT_SYMBOL(dev_get_flags);
L
Linus Torvalds 已提交
4703

4704
int __dev_change_flags(struct net_device *dev, unsigned int flags)
L
Linus Torvalds 已提交
4705
{
4706
	unsigned int old_flags = dev->flags;
4707
	int ret;
L
Linus Torvalds 已提交
4708

4709 4710
	ASSERT_RTNL();

L
Linus Torvalds 已提交
4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724
	/*
	 *	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.
	 */

4725 4726
	if ((old_flags ^ flags) & IFF_MULTICAST)
		dev_change_rx_flags(dev, IFF_MULTICAST);
4727

4728
	dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
4729 4730 4731 4732 4733 4734 4735 4736 4737

	/*
	 *	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  ? */
4738
		ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
L
Linus Torvalds 已提交
4739 4740

		if (!ret)
4741
			dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
4742 4743 4744
	}

	if ((flags ^ dev->gflags) & IFF_PROMISC) {
E
Eric Dumazet 已提交
4745 4746
		int inc = (flags & IFF_PROMISC) ? 1 : -1;

L
Linus Torvalds 已提交
4747 4748 4749 4750 4751 4752 4753 4754 4755
		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
4756 4757
		int inc = (flags & IFF_ALLMULTI) ? 1 : -1;

L
Linus Torvalds 已提交
4758 4759 4760 4761
		dev->gflags ^= IFF_ALLMULTI;
		dev_set_allmulti(dev, inc);
	}

4762 4763 4764 4765 4766 4767 4768 4769 4770 4771 4772 4773 4774 4775 4776 4777 4778 4779 4780 4781 4782 4783 4784 4785 4786 4787 4788
	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.
 */
4789
int dev_change_flags(struct net_device *dev, unsigned int flags)
4790
{
4791 4792
	int ret;
	unsigned int changes, old_flags = dev->flags;
4793 4794 4795 4796 4797 4798

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

	changes = old_flags ^ dev->flags;
4799 4800
	if (changes)
		rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
L
Linus Torvalds 已提交
4801

4802
	__dev_notify_flags(dev, old_flags);
L
Linus Torvalds 已提交
4803 4804
	return ret;
}
E
Eric Dumazet 已提交
4805
EXPORT_SYMBOL(dev_change_flags);
L
Linus Torvalds 已提交
4806

4807 4808 4809 4810 4811 4812 4813
/**
 *	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
4814 4815
int dev_set_mtu(struct net_device *dev, int new_mtu)
{
4816
	const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829
	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;
4830 4831
	if (ops->ndo_change_mtu)
		err = ops->ndo_change_mtu(dev, new_mtu);
L
Linus Torvalds 已提交
4832 4833
	else
		dev->mtu = new_mtu;
4834

L
Linus Torvalds 已提交
4835
	if (!err && dev->flags & IFF_UP)
4836
		call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
L
Linus Torvalds 已提交
4837 4838
	return err;
}
E
Eric Dumazet 已提交
4839
EXPORT_SYMBOL(dev_set_mtu);
L
Linus Torvalds 已提交
4840

4841 4842 4843 4844 4845 4846 4847 4848 4849 4850 4851
/**
 *	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);

4852 4853 4854 4855 4856 4857 4858
/**
 *	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
4859 4860
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
{
4861
	const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
4862 4863
	int err;

4864
	if (!ops->ndo_set_mac_address)
L
Linus Torvalds 已提交
4865 4866 4867 4868 4869
		return -EOPNOTSUPP;
	if (sa->sa_family != dev->type)
		return -EINVAL;
	if (!netif_device_present(dev))
		return -ENODEV;
4870
	err = ops->ndo_set_mac_address(dev, sa);
L
Linus Torvalds 已提交
4871
	if (!err)
4872
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4873
	add_device_randomness(dev->dev_addr, dev->addr_len);
L
Linus Torvalds 已提交
4874 4875
	return err;
}
E
Eric Dumazet 已提交
4876
EXPORT_SYMBOL(dev_set_mac_address);
L
Linus Torvalds 已提交
4877 4878

/*
E
Eric Dumazet 已提交
4879
 *	Perform the SIOCxIFxxx calls, inside rcu_read_lock()
L
Linus Torvalds 已提交
4880
 */
4881
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
L
Linus Torvalds 已提交
4882 4883
{
	int err;
E
Eric Dumazet 已提交
4884
	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
L
Linus Torvalds 已提交
4885 4886 4887 4888 4889

	if (!dev)
		return -ENODEV;

	switch (cmd) {
E
Eric Dumazet 已提交
4890 4891 4892
	case SIOCGIFFLAGS:	/* Get interface flags */
		ifr->ifr_flags = (short) dev_get_flags(dev);
		return 0;
L
Linus Torvalds 已提交
4893

E
Eric Dumazet 已提交
4894 4895 4896 4897
	case SIOCGIFMETRIC:	/* Get the metric on the interface
				   (currently unused) */
		ifr->ifr_metric = 0;
		return 0;
L
Linus Torvalds 已提交
4898

E
Eric Dumazet 已提交
4899 4900 4901
	case SIOCGIFMTU:	/* Get the MTU of a device */
		ifr->ifr_mtu = dev->mtu;
		return 0;
L
Linus Torvalds 已提交
4902

E
Eric Dumazet 已提交
4903 4904 4905 4906 4907 4908 4909 4910
	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
4911

E
Eric Dumazet 已提交
4912 4913 4914
	case SIOCGIFSLAVE:
		err = -EINVAL;
		break;
4915

E
Eric Dumazet 已提交
4916 4917 4918 4919 4920 4921 4922 4923
	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;
4924

E
Eric Dumazet 已提交
4925 4926 4927
	case SIOCGIFINDEX:
		ifr->ifr_ifindex = dev->ifindex;
		return 0;
4928

E
Eric Dumazet 已提交
4929 4930 4931
	case SIOCGIFTXQLEN:
		ifr->ifr_qlen = dev->tx_queue_len;
		return 0;
4932

E
Eric Dumazet 已提交
4933 4934 4935 4936 4937
	default:
		/* dev_ioctl() should ensure this case
		 * is never reached
		 */
		WARN_ON(1);
4938
		err = -ENOTTY;
E
Eric Dumazet 已提交
4939
		break;
4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950 4951

	}
	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
4952
	const struct net_device_ops *ops;
4953 4954 4955 4956

	if (!dev)
		return -ENODEV;

J
Jarek Poplawski 已提交
4957 4958
	ops = dev->netdev_ops;

4959
	switch (cmd) {
E
Eric Dumazet 已提交
4960 4961
	case SIOCSIFFLAGS:	/* Set interface flags */
		return dev_change_flags(dev, ifr->ifr_flags);
4962

E
Eric Dumazet 已提交
4963 4964 4965
	case SIOCSIFMETRIC:	/* Set the metric on the interface
				   (currently unused) */
		return -EOPNOTSUPP;
4966

E
Eric Dumazet 已提交
4967 4968
	case SIOCSIFMTU:	/* Set the MTU of a device */
		return dev_set_mtu(dev, ifr->ifr_mtu);
L
Linus Torvalds 已提交
4969

E
Eric Dumazet 已提交
4970 4971
	case SIOCSIFHWADDR:
		return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
L
Linus Torvalds 已提交
4972

E
Eric Dumazet 已提交
4973 4974 4975 4976 4977 4978 4979
	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
4980

E
Eric Dumazet 已提交
4981 4982
	case SIOCSIFMAP:
		if (ops->ndo_set_config) {
L
Linus Torvalds 已提交
4983 4984
			if (!netif_device_present(dev))
				return -ENODEV;
E
Eric Dumazet 已提交
4985 4986 4987
			return ops->ndo_set_config(dev, &ifr->ifr_map);
		}
		return -EOPNOTSUPP;
L
Linus Torvalds 已提交
4988

E
Eric Dumazet 已提交
4989
	case SIOCADDMULTI:
4990
		if (!ops->ndo_set_rx_mode ||
E
Eric Dumazet 已提交
4991 4992 4993 4994
		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
			return -EINVAL;
		if (!netif_device_present(dev))
			return -ENODEV;
4995
		return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
E
Eric Dumazet 已提交
4996 4997

	case SIOCDELMULTI:
4998
		if (!ops->ndo_set_rx_mode ||
E
Eric Dumazet 已提交
4999 5000 5001 5002
		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
			return -EINVAL;
		if (!netif_device_present(dev))
			return -ENODEV;
5003
		return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
L
Linus Torvalds 已提交
5004

E
Eric Dumazet 已提交
5005 5006 5007 5008 5009
	case SIOCSIFTXQLEN:
		if (ifr->ifr_qlen < 0)
			return -EINVAL;
		dev->tx_queue_len = ifr->ifr_qlen;
		return 0;
L
Linus Torvalds 已提交
5010

E
Eric Dumazet 已提交
5011 5012 5013
	case SIOCSIFNAME:
		ifr->ifr_newname[IFNAMSIZ-1] = '\0';
		return dev_change_name(dev, ifr->ifr_newname);
L
Linus Torvalds 已提交
5014

5015 5016 5017 5018 5019 5020
	case SIOCSHWTSTAMP:
		err = net_hwtstamp_validate(ifr);
		if (err)
			return err;
		/* fall through */

E
Eric Dumazet 已提交
5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048
	/*
	 *	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
5049 5050 5051 5052 5053 5054 5055 5056 5057 5058 5059 5060

	}
	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
5061
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
5062 5063 5064 5065 5066 5067 5068 5069 5070
 *	@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.
 */

5071
int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
L
Linus Torvalds 已提交
5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082
{
	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) {
5083
		rtnl_lock();
5084
		ret = dev_ifconf(net, (char __user *) arg);
5085
		rtnl_unlock();
L
Linus Torvalds 已提交
5086 5087 5088
		return ret;
	}
	if (cmd == SIOCGIFNAME)
5089
		return dev_ifname(net, (struct ifreq __user *)arg);
L
Linus Torvalds 已提交
5090 5091 5092 5093 5094 5095 5096 5097 5098 5099 5100 5101 5102 5103 5104

	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
5105 5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119
	/*
	 *	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
5120
		rcu_read_lock();
E
Eric Dumazet 已提交
5121
		ret = dev_ifsioc_locked(net, &ifr, cmd);
E
Eric Dumazet 已提交
5122
		rcu_read_unlock();
E
Eric Dumazet 已提交
5123 5124 5125 5126 5127 5128 5129 5130
		if (!ret) {
			if (colon)
				*colon = ':';
			if (copy_to_user(arg, &ifr,
					 sizeof(struct ifreq)))
				ret = -EFAULT;
		}
		return ret;
L
Linus Torvalds 已提交
5131

E
Eric Dumazet 已提交
5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144
	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
5145

E
Eric Dumazet 已提交
5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166 5167 5168
	/*
	 *	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
5169

E
Eric Dumazet 已提交
5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190 5191 5192 5193 5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211
	/*
	 *	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:
5212
		return -ENOTTY;
E
Eric Dumazet 已提交
5213 5214 5215 5216 5217 5218 5219 5220

	/*
	 *	Unknown or private ioctl.
	 */
	default:
		if (cmd == SIOCWANDEV ||
		    (cmd >= SIOCDEVPRIVATE &&
		     cmd <= SIOCDEVPRIVATE + 15)) {
5221
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
5222
			rtnl_lock();
5223
			ret = dev_ifsioc(net, &ifr, cmd);
L
Linus Torvalds 已提交
5224
			rtnl_unlock();
E
Eric Dumazet 已提交
5225 5226 5227
			if (!ret && copy_to_user(arg, &ifr,
						 sizeof(struct ifreq)))
				ret = -EFAULT;
L
Linus Torvalds 已提交
5228
			return ret;
E
Eric Dumazet 已提交
5229 5230 5231 5232
		}
		/* Take care of Wireless Extensions */
		if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
			return wext_handle_ioctl(net, &ifr, cmd, arg);
5233
		return -ENOTTY;
L
Linus Torvalds 已提交
5234 5235 5236 5237 5238 5239
	}
}


/**
 *	dev_new_index	-	allocate an ifindex
5240
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
5241 5242 5243 5244 5245
 *
 *	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.
 */
5246
static int dev_new_index(struct net *net)
L
Linus Torvalds 已提交
5247
{
5248
	int ifindex = net->ifindex;
L
Linus Torvalds 已提交
5249 5250 5251
	for (;;) {
		if (++ifindex <= 0)
			ifindex = 1;
5252
		if (!__dev_get_by_index(net, ifindex))
5253
			return net->ifindex = ifindex;
L
Linus Torvalds 已提交
5254 5255 5256 5257
	}
}

/* Delayed registration/unregisteration */
5258
static LIST_HEAD(net_todo_list);
L
Linus Torvalds 已提交
5259

5260
static void net_set_todo(struct net_device *dev)
L
Linus Torvalds 已提交
5261 5262 5263 5264
{
	list_add_tail(&dev->todo_list, &net_todo_list);
}

5265
static void rollback_registered_many(struct list_head *head)
5266
{
5267
	struct net_device *dev, *tmp;
5268

5269 5270 5271
	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

5272
	list_for_each_entry_safe(dev, tmp, head, unreg_list) {
5273
		/* Some devices call without registering
5274 5275
		 * for initialization unwind. Remove those
		 * devices and proceed with the remaining.
5276 5277
		 */
		if (dev->reg_state == NETREG_UNINITIALIZED) {
5278 5279
			pr_debug("unregister_netdevice: device %s/%p never was registered\n",
				 dev->name, dev);
5280

5281
			WARN_ON(1);
5282 5283
			list_del(&dev->unreg_list);
			continue;
5284
		}
5285
		dev->dismantle = true;
5286
		BUG_ON(dev->reg_state != NETREG_REGISTERED);
5287
	}
5288

5289 5290
	/* If device is running, close it first. */
	dev_close_many(head);
5291

5292
	list_for_each_entry(dev, head, unreg_list) {
5293 5294
		/* And unlink it from device chain. */
		unlist_netdevice(dev);
5295

5296 5297
		dev->reg_state = NETREG_UNREGISTERING;
	}
5298 5299 5300

	synchronize_net();

5301 5302 5303
	list_for_each_entry(dev, head, unreg_list) {
		/* Shutdown queueing discipline. */
		dev_shutdown(dev);
5304 5305


5306 5307 5308 5309
		/* Notify protocols, that we are about to destroy
		   this device. They should clean all the things.
		*/
		call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5310

5311 5312 5313 5314
		if (!dev->rtnl_link_ops ||
		    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
			rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);

5315 5316 5317
		/*
		 *	Flush the unicast and multicast chains
		 */
5318
		dev_uc_flush(dev);
5319
		dev_mc_flush(dev);
5320

5321 5322
		if (dev->netdev_ops->ndo_uninit)
			dev->netdev_ops->ndo_uninit(dev);
5323

5324 5325
		/* Notifier chain MUST detach us from master device. */
		WARN_ON(dev->master);
5326

5327 5328 5329
		/* Remove entries from kobject tree */
		netdev_unregister_kobject(dev);
	}
5330

5331
	synchronize_net();
5332

5333
	list_for_each_entry(dev, head, unreg_list)
5334 5335 5336 5337 5338 5339 5340 5341 5342
		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
5343
	list_del(&single);
5344 5345
}

5346 5347
static netdev_features_t netdev_fix_features(struct net_device *dev,
	netdev_features_t features)
5348
{
5349 5350 5351
	/* Fix illegal checksum combinations */
	if ((features & NETIF_F_HW_CSUM) &&
	    (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
5352
		netdev_warn(dev, "mixed HW and IP checksum settings.\n");
5353 5354 5355
		features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
	}

5356 5357 5358
	/* Fix illegal SG+CSUM combinations. */
	if ((features & NETIF_F_SG) &&
	    !(features & NETIF_F_ALL_CSUM)) {
5359 5360
		netdev_dbg(dev,
			"Dropping NETIF_F_SG since no checksum feature.\n");
5361 5362 5363 5364
		features &= ~NETIF_F_SG;
	}

	/* TSO requires that SG is present as well. */
5365
	if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
5366
		netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
5367
		features &= ~NETIF_F_ALL_TSO;
5368 5369
	}

5370 5371 5372 5373
	/* TSO ECN requires that TSO is present as well. */
	if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
		features &= ~NETIF_F_TSO_ECN;

5374 5375
	/* Software GSO depends on SG. */
	if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
5376
		netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
5377 5378 5379
		features &= ~NETIF_F_GSO;
	}

5380
	/* UFO needs SG and checksumming */
5381
	if (features & NETIF_F_UFO) {
5382 5383 5384 5385
		/* 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))) {
5386
			netdev_dbg(dev,
5387
				"Dropping NETIF_F_UFO since no checksum offload features.\n");
5388 5389 5390 5391
			features &= ~NETIF_F_UFO;
		}

		if (!(features & NETIF_F_SG)) {
5392
			netdev_dbg(dev,
5393
				"Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
5394 5395 5396 5397 5398 5399 5400
			features &= ~NETIF_F_UFO;
		}
	}

	return features;
}

5401
int __netdev_update_features(struct net_device *dev)
5402
{
5403
	netdev_features_t features;
5404 5405
	int err = 0;

5406 5407
	ASSERT_RTNL();

5408 5409 5410 5411 5412 5413 5414 5415 5416
	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)
5417
		return 0;
5418

5419 5420
	netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
		&dev->features, &features);
5421 5422 5423 5424

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

5425
	if (unlikely(err < 0)) {
5426
		netdev_err(dev,
5427 5428
			"set_features() failed (%d); wanted %pNF, left %pNF\n",
			err, &features, &dev->features);
5429 5430 5431 5432 5433 5434 5435 5436 5437
		return -1;
	}

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

	return 1;
}

5438 5439 5440 5441 5442 5443 5444 5445
/**
 *	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.
 */
5446 5447 5448 5449
void netdev_update_features(struct net_device *dev)
{
	if (__netdev_update_features(dev))
		netdev_features_change(dev);
5450 5451 5452
}
EXPORT_SYMBOL(netdev_update_features);

5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469
/**
 *	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);

5470 5471 5472 5473 5474 5475 5476 5477 5478 5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494 5495 5496
/**
 *	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
5497
#ifdef CONFIG_RPS
5498 5499 5500
static int netif_alloc_rx_queues(struct net_device *dev)
{
	unsigned int i, count = dev->num_rx_queues;
T
Tom Herbert 已提交
5501
	struct netdev_rx_queue *rx;
5502

T
Tom Herbert 已提交
5503
	BUG_ON(count < 1);
5504

T
Tom Herbert 已提交
5505 5506
	rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
	if (!rx) {
5507
		pr_err("netdev: Unable to allocate %u rx queues\n", count);
T
Tom Herbert 已提交
5508
		return -ENOMEM;
5509
	}
T
Tom Herbert 已提交
5510 5511 5512
	dev->_rx = rx;

	for (i = 0; i < count; i++)
T
Tom Herbert 已提交
5513
		rx[i].dev = dev;
5514 5515
	return 0;
}
T
Tom Herbert 已提交
5516
#endif
5517

C
Changli Gao 已提交
5518 5519 5520 5521 5522 5523 5524
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;
5525
	netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
C
Changli Gao 已提交
5526
	queue->dev = dev;
T
Tom Herbert 已提交
5527 5528 5529
#ifdef CONFIG_BQL
	dql_init(&queue->dql, HZ);
#endif
C
Changli Gao 已提交
5530 5531
}

5532 5533 5534 5535 5536 5537 5538 5539 5540
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) {
5541
		pr_err("netdev: Unable to allocate %u tx queues\n", count);
5542 5543 5544
		return -ENOMEM;
	}
	dev->_tx = tx;
T
Tom Herbert 已提交
5545

5546 5547
	netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
	spin_lock_init(&dev->tx_global_lock);
C
Changli Gao 已提交
5548 5549

	return 0;
5550 5551
}

L
Linus Torvalds 已提交
5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568 5569 5570 5571
/**
 *	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;
5572
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
5573 5574 5575 5576

	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

5577 5578
	might_sleep();

L
Linus Torvalds 已提交
5579 5580
	/* When net_device's are persistent, this will be fatal. */
	BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
5581
	BUG_ON(!net);
L
Linus Torvalds 已提交
5582

5583
	spin_lock_init(&dev->addr_list_lock);
5584
	netdev_set_addr_lockdep_class(dev);
L
Linus Torvalds 已提交
5585 5586 5587

	dev->iflink = -1;

5588 5589 5590 5591
	ret = dev_get_valid_name(dev, dev->name);
	if (ret < 0)
		goto out;

L
Linus Torvalds 已提交
5592
	/* Init, if this function is available */
5593 5594
	if (dev->netdev_ops->ndo_init) {
		ret = dev->netdev_ops->ndo_init(dev);
L
Linus Torvalds 已提交
5595 5596 5597
		if (ret) {
			if (ret > 0)
				ret = -EIO;
5598
			goto out;
L
Linus Torvalds 已提交
5599 5600
		}
	}
5601

5602 5603 5604 5605 5606 5607
	ret = -EBUSY;
	if (!dev->ifindex)
		dev->ifindex = dev_new_index(net);
	else if (__dev_get_by_index(net, dev->ifindex))
		goto err_uninit;

L
Linus Torvalds 已提交
5608 5609 5610
	if (dev->iflink == -1)
		dev->iflink = dev->ifindex;

5611 5612 5613 5614
	/* Transfer changeable features to wanted_features and enable
	 * software offloads (GSO and GRO).
	 */
	dev->hw_features |= NETIF_F_SOFT_FEATURES;
5615 5616
	dev->features |= NETIF_F_SOFT_FEATURES;
	dev->wanted_features = dev->features & dev->hw_features;
L
Linus Torvalds 已提交
5617

5618
	/* Turn on no cache copy if HW is doing checksum */
5619 5620 5621 5622 5623 5624
	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;
		}
5625 5626
	}

5627
	/* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
5628
	 */
5629
	dev->vlan_features |= NETIF_F_HIGHDMA;
5630

5631 5632 5633 5634 5635
	ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		goto err_uninit;

5636
	ret = netdev_register_kobject(dev);
5637
	if (ret)
5638
		goto err_uninit;
5639 5640
	dev->reg_state = NETREG_REGISTERED;

5641
	__netdev_update_features(dev);
5642

L
Linus Torvalds 已提交
5643 5644 5645 5646 5647 5648 5649
	/*
	 *	Default initial state at registry is that the
	 *	device is present.
	 */

	set_bit(__LINK_STATE_PRESENT, &dev->state);

5650 5651
	linkwatch_init_dev(dev);

L
Linus Torvalds 已提交
5652 5653
	dev_init_scheduler(dev);
	dev_hold(dev);
5654
	list_netdevice(dev);
5655
	add_device_randomness(dev->dev_addr, dev->addr_len);
L
Linus Torvalds 已提交
5656 5657

	/* Notify protocols, that a new device appeared. */
5658
	ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
5659
	ret = notifier_to_errno(ret);
5660 5661 5662 5663
	if (ret) {
		rollback_registered(dev);
		dev->reg_state = NETREG_UNREGISTERED;
	}
5664 5665 5666 5667
	/*
	 *	Prevent userspace races by waiting until the network
	 *	device is fully setup before sending notifications.
	 */
5668 5669 5670
	if (!dev->rtnl_link_ops ||
	    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
		rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
L
Linus Torvalds 已提交
5671 5672 5673

out:
	return ret;
5674 5675

err_uninit:
5676 5677
	if (dev->netdev_ops->ndo_uninit)
		dev->netdev_ops->ndo_uninit(dev);
5678
	goto out;
L
Linus Torvalds 已提交
5679
}
E
Eric Dumazet 已提交
5680
EXPORT_SYMBOL(register_netdevice);
L
Linus Torvalds 已提交
5681

5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712
/**
 *	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
5713 5714 5715 5716 5717
	/* Note : We dont allocate pcpu_refcnt for dummy devices,
	 * because users of this 'device' dont need to change
	 * its refcount.
	 */

5718 5719 5720 5721 5722
	return 0;
}
EXPORT_SYMBOL_GPL(init_dummy_netdev);


L
Linus Torvalds 已提交
5723 5724 5725 5726 5727 5728 5729 5730 5731
/**
 *	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.
 *
5732
 *	This is a wrapper around register_netdevice that takes the rtnl semaphore
L
Linus Torvalds 已提交
5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746
 *	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
5747 5748 5749 5750 5751 5752 5753 5754 5755 5756
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);

5757
/**
L
Linus Torvalds 已提交
5758
 * netdev_wait_allrefs - wait until all references are gone.
5759
 * @dev: target net_device
L
Linus Torvalds 已提交
5760 5761 5762 5763 5764 5765 5766
 *
 * 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
5767
 * call dev_put.
L
Linus Torvalds 已提交
5768 5769 5770 5771
 */
static void netdev_wait_allrefs(struct net_device *dev)
{
	unsigned long rebroadcast_time, warning_time;
E
Eric Dumazet 已提交
5772
	int refcnt;
L
Linus Torvalds 已提交
5773

5774 5775
	linkwatch_forget_dev(dev);

L
Linus Torvalds 已提交
5776
	rebroadcast_time = warning_time = jiffies;
E
Eric Dumazet 已提交
5777 5778 5779
	refcnt = netdev_refcnt_read(dev);

	while (refcnt != 0) {
L
Linus Torvalds 已提交
5780
		if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5781
			rtnl_lock();
L
Linus Torvalds 已提交
5782 5783

			/* Rebroadcast unregister notification */
5784
			call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5785 5786

			__rtnl_unlock();
5787
			rcu_barrier();
5788 5789
			rtnl_lock();

5790
			call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
L
Linus Torvalds 已提交
5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801
			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();
			}

5802
			__rtnl_unlock();
L
Linus Torvalds 已提交
5803 5804 5805 5806 5807 5808

			rebroadcast_time = jiffies;
		}

		msleep(250);

E
Eric Dumazet 已提交
5809 5810
		refcnt = netdev_refcnt_read(dev);

L
Linus Torvalds 已提交
5811
		if (time_after(jiffies, warning_time + 10 * HZ)) {
5812 5813
			pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
				 dev->name, refcnt);
L
Linus Torvalds 已提交
5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831 5832
			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
5833
 * We are invoked by rtnl_unlock().
L
Linus Torvalds 已提交
5834
 * This allows us to deal with problems:
5835
 * 1) We can delete sysfs objects which invoke hotplug
L
Linus Torvalds 已提交
5836 5837 5838
 *    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
5839 5840 5841
 *
 * 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
5842 5843 5844
 */
void netdev_run_todo(void)
{
5845
	struct list_head list;
L
Linus Torvalds 已提交
5846 5847

	/* Snapshot list, allow later requests */
5848
	list_replace_init(&net_todo_list, &list);
H
Herbert Xu 已提交
5849 5850

	__rtnl_unlock();
5851

5852 5853

	/* Wait for rcu callbacks to finish before next phase */
5854 5855 5856
	if (!list_empty(&list))
		rcu_barrier();

L
Linus Torvalds 已提交
5857 5858
	while (!list_empty(&list)) {
		struct net_device *dev
5859
			= list_first_entry(&list, struct net_device, todo_list);
L
Linus Torvalds 已提交
5860 5861
		list_del(&dev->todo_list);

5862
		rtnl_lock();
5863
		call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
5864
		__rtnl_unlock();
5865

5866
		if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
5867
			pr_err("network todo '%s' but state %d\n",
5868 5869 5870 5871
			       dev->name, dev->reg_state);
			dump_stack();
			continue;
		}
L
Linus Torvalds 已提交
5872

5873
		dev->reg_state = NETREG_UNREGISTERED;
L
Linus Torvalds 已提交
5874

5875
		on_each_cpu(flush_backlog, dev, 1);
5876

5877
		netdev_wait_allrefs(dev);
L
Linus Torvalds 已提交
5878

5879
		/* paranoia */
E
Eric Dumazet 已提交
5880
		BUG_ON(netdev_refcnt_read(dev));
5881 5882
		WARN_ON(rcu_access_pointer(dev->ip_ptr));
		WARN_ON(rcu_access_pointer(dev->ip6_ptr));
5883
		WARN_ON(dev->dn_ptr);
L
Linus Torvalds 已提交
5884

5885 5886
		if (dev->destructor)
			dev->destructor(dev);
5887 5888 5889

		/* Free network device */
		kobject_put(&dev->dev.kobj);
L
Linus Torvalds 已提交
5890 5891 5892
	}
}

5893 5894 5895
/* Convert net_device_stats to rtnl_link_stats64.  They have the same
 * fields in the same order, with only the type differing.
 */
5896 5897
void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
			     const struct net_device_stats *netdev_stats)
5898 5899
{
#if BITS_PER_LONG == 64
5900 5901
	BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats));
	memcpy(stats64, netdev_stats, sizeof(*stats64));
5902 5903 5904 5905 5906 5907 5908 5909 5910 5911 5912
#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
}
5913
EXPORT_SYMBOL(netdev_stats_to_stats64);
5914

5915 5916 5917
/**
 *	dev_get_stats	- get network device statistics
 *	@dev: device to get statistics from
5918
 *	@storage: place to store stats
5919
 *
5920 5921 5922 5923
 *	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.
5924
 */
5925 5926
struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
					struct rtnl_link_stats64 *storage)
5927
{
5928 5929
	const struct net_device_ops *ops = dev->netdev_ops;

5930 5931
	if (ops->ndo_get_stats64) {
		memset(storage, 0, sizeof(*storage));
5932 5933
		ops->ndo_get_stats64(dev, storage);
	} else if (ops->ndo_get_stats) {
5934
		netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
5935 5936
	} else {
		netdev_stats_to_stats64(storage, &dev->stats);
5937
	}
5938
	storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
5939
	return storage;
R
Rusty Russell 已提交
5940
}
5941
EXPORT_SYMBOL(dev_get_stats);
R
Rusty Russell 已提交
5942

5943
struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
5944
{
5945
	struct netdev_queue *queue = dev_ingress_queue(dev);
5946

5947 5948 5949 5950 5951 5952 5953 5954 5955 5956 5957 5958
#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;
5959 5960
}

L
Linus Torvalds 已提交
5961
/**
T
Tom Herbert 已提交
5962
 *	alloc_netdev_mqs - allocate network device
L
Linus Torvalds 已提交
5963 5964 5965
 *	@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
5966 5967
 *	@txqs:		the number of TX subqueues to allocate
 *	@rxqs:		the number of RX subqueues to allocate
L
Linus Torvalds 已提交
5968 5969
 *
 *	Allocates a struct net_device with private data area for driver use
5970
 *	and performs basic initialization.  Also allocates subquue structs
T
Tom Herbert 已提交
5971
 *	for each queue on the device.
L
Linus Torvalds 已提交
5972
 */
T
Tom Herbert 已提交
5973 5974 5975
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
5976 5977
{
	struct net_device *dev;
5978
	size_t alloc_size;
5979
	struct net_device *p;
L
Linus Torvalds 已提交
5980

5981 5982
	BUG_ON(strlen(name) >= sizeof(dev->name));

T
Tom Herbert 已提交
5983
	if (txqs < 1) {
5984
		pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
5985 5986 5987
		return NULL;
	}

T
Tom Herbert 已提交
5988 5989
#ifdef CONFIG_RPS
	if (rxqs < 1) {
5990
		pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
T
Tom Herbert 已提交
5991 5992 5993 5994
		return NULL;
	}
#endif

5995
	alloc_size = sizeof(struct net_device);
5996 5997
	if (sizeof_priv) {
		/* ensure 32-byte alignment of private area */
5998
		alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5999 6000 6001
		alloc_size += sizeof_priv;
	}
	/* ensure 32-byte alignment of whole construct */
6002
	alloc_size += NETDEV_ALIGN - 1;
L
Linus Torvalds 已提交
6003

6004
	p = kzalloc(alloc_size, GFP_KERNEL);
L
Linus Torvalds 已提交
6005
	if (!p) {
6006
		pr_err("alloc_netdev: Unable to allocate device\n");
L
Linus Torvalds 已提交
6007 6008 6009
		return NULL;
	}

6010
	dev = PTR_ALIGN(p, NETDEV_ALIGN);
L
Linus Torvalds 已提交
6011
	dev->padded = (char *)dev - (char *)p;
6012

E
Eric Dumazet 已提交
6013 6014
	dev->pcpu_refcnt = alloc_percpu(int);
	if (!dev->pcpu_refcnt)
6015
		goto free_p;
6016 6017

	if (dev_addr_init(dev))
E
Eric Dumazet 已提交
6018
		goto free_pcpu;
6019

6020
	dev_mc_init(dev);
6021
	dev_uc_init(dev);
J
Jiri Pirko 已提交
6022

6023
	dev_net_set(dev, &init_net);
L
Linus Torvalds 已提交
6024

6025
	dev->gso_max_size = GSO_MAX_SIZE;
6026
	dev->gso_max_segs = GSO_MAX_SEGS;
6027 6028 6029 6030 6031 6032 6033

	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
6034 6035
	dev->num_tx_queues = txqs;
	dev->real_num_tx_queues = txqs;
6036
	if (netif_alloc_netdev_queues(dev))
6037
		goto free_all;
6038

E
Eric Dumazet 已提交
6039
#ifdef CONFIG_RPS
T
Tom Herbert 已提交
6040 6041
	dev->num_rx_queues = rxqs;
	dev->real_num_rx_queues = rxqs;
T
Tom Herbert 已提交
6042
	if (netif_alloc_rx_queues(dev))
6043
		goto free_all;
E
Eric Dumazet 已提交
6044
#endif
T
Tom Herbert 已提交
6045

L
Linus Torvalds 已提交
6046
	strcpy(dev->name, name);
6047
	dev->group = INIT_NETDEV_GROUP;
L
Linus Torvalds 已提交
6048
	return dev;
6049

6050 6051 6052 6053
free_all:
	free_netdev(dev);
	return NULL;

E
Eric Dumazet 已提交
6054 6055
free_pcpu:
	free_percpu(dev->pcpu_refcnt);
6056
	kfree(dev->_tx);
T
Tom Herbert 已提交
6057 6058 6059 6060
#ifdef CONFIG_RPS
	kfree(dev->_rx);
#endif

6061 6062 6063
free_p:
	kfree(p);
	return NULL;
L
Linus Torvalds 已提交
6064
}
T
Tom Herbert 已提交
6065
EXPORT_SYMBOL(alloc_netdev_mqs);
L
Linus Torvalds 已提交
6066 6067 6068 6069 6070

/**
 *	free_netdev - free network device
 *	@dev: device
 *
6071 6072
 *	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
6073 6074 6075 6076
 *	If this is the last reference then it will be freed.
 */
void free_netdev(struct net_device *dev)
{
6077 6078
	struct napi_struct *p, *n;

6079 6080
	release_net(dev_net(dev));

6081
	kfree(dev->_tx);
T
Tom Herbert 已提交
6082 6083 6084
#ifdef CONFIG_RPS
	kfree(dev->_rx);
#endif
6085

6086
	kfree(rcu_dereference_protected(dev->ingress_queue, 1));
6087

6088 6089 6090
	/* Flush device addresses */
	dev_addr_flush(dev);

6091 6092 6093
	list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
		netif_napi_del(p);

E
Eric Dumazet 已提交
6094 6095 6096
	free_percpu(dev->pcpu_refcnt);
	dev->pcpu_refcnt = NULL;

S
Stephen Hemminger 已提交
6097
	/*  Compatibility with error handling in drivers */
L
Linus Torvalds 已提交
6098 6099 6100 6101 6102 6103 6104 6105
	if (dev->reg_state == NETREG_UNINITIALIZED) {
		kfree((char *)dev - dev->padded);
		return;
	}

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

6106 6107
	/* will free via device release */
	put_device(&dev->dev);
L
Linus Torvalds 已提交
6108
}
E
Eric Dumazet 已提交
6109
EXPORT_SYMBOL(free_netdev);
6110

6111 6112 6113 6114 6115 6116
/**
 *	synchronize_net -  Synchronize with packet receive processing
 *
 *	Wait for packets currently being received to be done.
 *	Does not block later packets from starting.
 */
6117
void synchronize_net(void)
L
Linus Torvalds 已提交
6118 6119
{
	might_sleep();
6120 6121 6122 6123
	if (rtnl_is_locked())
		synchronize_rcu_expedited();
	else
		synchronize_rcu();
L
Linus Torvalds 已提交
6124
}
E
Eric Dumazet 已提交
6125
EXPORT_SYMBOL(synchronize_net);
L
Linus Torvalds 已提交
6126 6127

/**
6128
 *	unregister_netdevice_queue - remove device from the kernel
L
Linus Torvalds 已提交
6129
 *	@dev: device
6130
 *	@head: list
6131
 *
L
Linus Torvalds 已提交
6132
 *	This function shuts down a device interface and removes it
6133
 *	from the kernel tables.
6134
 *	If head not NULL, device is queued to be unregistered later.
L
Linus Torvalds 已提交
6135 6136 6137 6138 6139
 *
 *	Callers must hold the rtnl semaphore.  You may want
 *	unregister_netdev() instead of this.
 */

6140
void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
L
Linus Torvalds 已提交
6141
{
6142 6143
	ASSERT_RTNL();

6144
	if (head) {
6145
		list_move_tail(&dev->unreg_list, head);
6146 6147 6148 6149 6150
	} else {
		rollback_registered(dev);
		/* Finish processing unregister after unlock */
		net_set_todo(dev);
	}
L
Linus Torvalds 已提交
6151
}
6152
EXPORT_SYMBOL(unregister_netdevice_queue);
L
Linus Torvalds 已提交
6153

6154 6155 6156 6157 6158 6159 6160 6161 6162 6163 6164 6165 6166 6167
/**
 *	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);
	}
}
6168
EXPORT_SYMBOL(unregister_netdevice_many);
6169

L
Linus Torvalds 已提交
6170 6171 6172 6173 6174
/**
 *	unregister_netdev - remove device from the kernel
 *	@dev: device
 *
 *	This function shuts down a device interface and removes it
6175
 *	from the kernel tables.
L
Linus Torvalds 已提交
6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188
 *
 *	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);

6189 6190 6191 6192 6193 6194 6195 6196 6197 6198 6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209 6210 6211 6212 6213 6214 6215 6216 6217 6218 6219 6220
/**
 *	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;
6221
	if (net_eq(dev_net(dev), net))
6222 6223 6224 6225 6226 6227
		goto out;

	/* Pick the destination device name, and ensure
	 * we can use it in the destination network namespace.
	 */
	err = -EEXIST;
6228
	if (__dev_get_by_name(net, dev->name)) {
6229 6230 6231
		/* We get here if we can't use the current device name */
		if (!pat)
			goto out;
6232
		if (dev_get_valid_name(dev, pat) < 0)
6233 6234 6235 6236 6237 6238 6239 6240
			goto out;
	}

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

	/* If device is running close it first. */
6241
	dev_close(dev);
6242 6243 6244 6245 6246 6247 6248 6249 6250 6251 6252 6253

	/* 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.
6254 6255 6256 6257

	   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.
6258 6259
	*/
	call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6260 6261
	rcu_barrier();
	call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
6262
	rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);
6263 6264 6265 6266

	/*
	 *	Flush the unicast and multicast chains
	 */
6267
	dev_uc_flush(dev);
6268
	dev_mc_flush(dev);
6269 6270

	/* Actually switch the network namespace */
6271
	dev_net_set(dev, net);
6272 6273 6274 6275 6276 6277 6278 6279 6280

	/* 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;
	}

6281
	/* Fixup kobjects */
6282
	err = device_rename(&dev->dev, dev->name);
6283
	WARN_ON(err);
6284 6285 6286 6287 6288 6289 6290

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

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

6291 6292 6293 6294 6295 6296
	/*
	 *	Prevent userspace races by waiting until the network
	 *	device is fully setup before sending notifications.
	 */
	rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);

6297 6298 6299 6300 6301
	synchronize_net();
	err = 0;
out:
	return err;
}
6302
EXPORT_SYMBOL_GPL(dev_change_net_namespace);
6303

L
Linus Torvalds 已提交
6304 6305 6306 6307 6308 6309 6310 6311 6312
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;

6313
	if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
L
Linus Torvalds 已提交
6314 6315 6316 6317 6318 6319 6320 6321 6322 6323 6324 6325 6326 6327 6328 6329
		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. */
6330 6331 6332 6333 6334 6335
	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;
	}
6336 6337 6338 6339 6340
	/* 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
6341 6342 6343 6344 6345

	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	local_irq_enable();

	/* Process offline CPU's input_pkt_queue */
6346
	while ((skb = __skb_dequeue(&oldsd->process_queue))) {
L
Linus Torvalds 已提交
6347
		netif_rx(skb);
6348
		input_queue_head_incr(oldsd);
T
Tom Herbert 已提交
6349
	}
6350
	while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
6351
		netif_rx(skb);
6352 6353
		input_queue_head_incr(oldsd);
	}
L
Linus Torvalds 已提交
6354 6355 6356 6357 6358

	return NOTIFY_OK;
}


6359
/**
6360 6361 6362 6363
 *	netdev_increment_features - increment feature set by one
 *	@all: current feature set
 *	@one: new feature set
 *	@mask: mask feature set
6364 6365
 *
 *	Computes a new feature set after adding a device with feature set
6366 6367
 *	@one to the master device with current feature set @all.  Will not
 *	enable anything that is off in @mask. Returns the new feature set.
6368
 */
6369 6370
netdev_features_t netdev_increment_features(netdev_features_t all,
	netdev_features_t one, netdev_features_t mask)
6371
{
6372 6373 6374
	if (mask & NETIF_F_GEN_CSUM)
		mask |= NETIF_F_ALL_CSUM;
	mask |= NETIF_F_VLAN_CHALLENGED;
6375

6376 6377
	all |= one & (NETIF_F_ONE_FOR_ALL|NETIF_F_ALL_CSUM) & mask;
	all &= one | ~NETIF_F_ALL_FOR_ALL;
6378

6379 6380 6381
	/* If one device supports hw checksumming, set for all. */
	if (all & NETIF_F_GEN_CSUM)
		all &= ~(NETIF_F_ALL_CSUM & ~NETIF_F_GEN_CSUM);
6382 6383 6384

	return all;
}
6385
EXPORT_SYMBOL(netdev_increment_features);
6386

6387 6388 6389 6390 6391 6392 6393 6394 6395 6396 6397 6398 6399
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;
}

6400
/* Initialize per network namespace state */
6401
static int __net_init netdev_init(struct net *net)
6402
{
6403 6404
	if (net != &init_net)
		INIT_LIST_HEAD(&net->dev_base_head);
6405

6406 6407 6408
	net->dev_name_head = netdev_create_hash();
	if (net->dev_name_head == NULL)
		goto err_name;
6409

6410 6411 6412
	net->dev_index_head = netdev_create_hash();
	if (net->dev_index_head == NULL)
		goto err_idx;
6413 6414

	return 0;
6415 6416 6417 6418 6419

err_idx:
	kfree(net->dev_name_head);
err_name:
	return -ENOMEM;
6420 6421
}

6422 6423 6424 6425 6426 6427
/**
 *	netdev_drivername - network driver for the device
 *	@dev: network device
 *
 *	Determine network driver for device.
 */
6428
const char *netdev_drivername(const struct net_device *dev)
6429
{
6430 6431
	const struct device_driver *driver;
	const struct device *parent;
6432
	const char *empty = "";
6433 6434 6435

	parent = dev->dev.parent;
	if (!parent)
6436
		return empty;
6437 6438 6439

	driver = parent->driver;
	if (driver && driver->name)
6440 6441
		return driver->name;
	return empty;
6442 6443
}

6444
int __netdev_printk(const char *level, const struct net_device *dev,
6445 6446 6447 6448 6449 6450 6451 6452 6453 6454 6455 6456 6457 6458
			   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;
}
6459
EXPORT_SYMBOL(__netdev_printk);
6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471 6472 6473 6474 6475 6476 6477 6478 6479 6480 6481 6482 6483 6484 6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498 6499 6500 6501 6502 6503 6504 6505 6506

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);

6507
static void __net_exit netdev_exit(struct net *net)
6508 6509 6510 6511 6512
{
	kfree(net->dev_name_head);
	kfree(net->dev_index_head);
}

6513
static struct pernet_operations __net_initdata netdev_net_ops = {
6514 6515 6516 6517
	.init = netdev_init,
	.exit = netdev_exit,
};

6518
static void __net_exit default_device_exit(struct net *net)
6519
{
6520
	struct net_device *dev, *aux;
6521
	/*
6522
	 * Push all migratable network devices back to the
6523 6524 6525
	 * initial network namespace
	 */
	rtnl_lock();
6526
	for_each_netdev_safe(net, dev, aux) {
6527
		int err;
6528
		char fb_name[IFNAMSIZ];
6529 6530 6531 6532 6533

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

6534 6535 6536
		/* Leave virtual devices for the generic cleanup */
		if (dev->rtnl_link_ops)
			continue;
6537

L
Lucas De Marchi 已提交
6538
		/* Push remaining network devices to init_net */
6539 6540
		snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
		err = dev_change_net_namespace(dev, &init_net, fb_name);
6541
		if (err) {
6542 6543
			pr_emerg("%s: failed to move %s to init_net: %d\n",
				 __func__, dev->name, err);
6544
			BUG();
6545 6546 6547 6548 6549
		}
	}
	rtnl_unlock();
}

6550 6551 6552
static void __net_exit default_device_exit_batch(struct list_head *net_list)
{
	/* At exit all network devices most be removed from a network
6553
	 * namespace.  Do this in the reverse order of registration.
6554 6555 6556 6557 6558 6559 6560 6561 6562 6563 6564 6565 6566 6567 6568 6569 6570
	 * 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
6571
	list_del(&dev_kill_list);
6572 6573 6574
	rtnl_unlock();
}

6575
static struct pernet_operations __net_initdata default_device_ops = {
6576
	.exit = default_device_exit,
6577
	.exit_batch = default_device_exit_batch,
6578 6579
};

L
Linus Torvalds 已提交
6580 6581 6582 6583 6584 6585 6586 6587 6588 6589 6590 6591 6592 6593 6594 6595 6596 6597 6598 6599
/*
 *	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;

6600
	if (netdev_kobject_init())
L
Linus Torvalds 已提交
6601 6602 6603
		goto out;

	INIT_LIST_HEAD(&ptype_all);
6604
	for (i = 0; i < PTYPE_HASH_SIZE; i++)
L
Linus Torvalds 已提交
6605 6606
		INIT_LIST_HEAD(&ptype_base[i]);

6607 6608
	if (register_pernet_subsys(&netdev_net_ops))
		goto out;
L
Linus Torvalds 已提交
6609 6610 6611 6612 6613

	/*
	 *	Initialise the packet receive queues.
	 */

6614
	for_each_possible_cpu(i) {
E
Eric Dumazet 已提交
6615
		struct softnet_data *sd = &per_cpu(softnet_data, i);
L
Linus Torvalds 已提交
6616

C
Changli Gao 已提交
6617
		memset(sd, 0, sizeof(*sd));
E
Eric Dumazet 已提交
6618
		skb_queue_head_init(&sd->input_pkt_queue);
6619
		skb_queue_head_init(&sd->process_queue);
E
Eric Dumazet 已提交
6620 6621
		sd->completion_queue = NULL;
		INIT_LIST_HEAD(&sd->poll_list);
6622 6623
		sd->output_queue = NULL;
		sd->output_queue_tailp = &sd->output_queue;
E
Eric Dumazet 已提交
6624
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
6625 6626 6627 6628
		sd->csd.func = rps_trigger_softirq;
		sd->csd.info = sd;
		sd->csd.flags = 0;
		sd->cpu = i;
6629
#endif
T
Tom Herbert 已提交
6630

E
Eric Dumazet 已提交
6631 6632 6633 6634
		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
6635 6636 6637 6638
	}

	dev_boot_phase = 0;

6639 6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653
	/* 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;

6654 6655
	open_softirq(NET_TX_SOFTIRQ, net_tx_action);
	open_softirq(NET_RX_SOFTIRQ, net_rx_action);
L
Linus Torvalds 已提交
6656 6657 6658 6659 6660 6661 6662 6663 6664 6665 6666

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

subsys_initcall(net_dev_init);

6667 6668
static int __init initialize_hashrnd(void)
{
T
Tom Herbert 已提交
6669
	get_random_bytes(&hashrnd, sizeof(hashrnd));
6670 6671 6672 6673 6674
	return 0;
}

late_initcall_sync(initialize_hashrnd);