dev.c 113.7 KB
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/*
 * 	NET3	Protocol independent device support routines.
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 *	Derived from the non IP parts of dev.c 1.0.19
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 * 		Authors:	Ross Biro
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 *				Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *				Mark Evans, <evansmp@uhura.aston.ac.uk>
 *
 *	Additional Authors:
 *		Florian la Roche <rzsfl@rz.uni-sb.de>
 *		Alan Cox <gw4pts@gw4pts.ampr.org>
 *		David Hinds <dahinds@users.sourceforge.net>
 *		Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
 *		Adam Sulmicki <adam@cfar.umd.edu>
 *              Pekka Riikonen <priikone@poesidon.pspt.fi>
 *
 *	Changes:
 *              D.J. Barrow     :       Fixed bug where dev->refcnt gets set
 *              			to 2 if register_netdev gets called
 *              			before net_dev_init & also removed a
 *              			few lines of code in the process.
 *		Alan Cox	:	device private ioctl copies fields back.
 *		Alan Cox	:	Transmit queue code does relevant
 *					stunts to keep the queue safe.
 *		Alan Cox	:	Fixed double lock.
 *		Alan Cox	:	Fixed promisc NULL pointer trap
 *		????????	:	Support the full private ioctl range
 *		Alan Cox	:	Moved ioctl permission check into
 *					drivers
 *		Tim Kordas	:	SIOCADDMULTI/SIOCDELMULTI
 *		Alan Cox	:	100 backlog just doesn't cut it when
 *					you start doing multicast video 8)
 *		Alan Cox	:	Rewrote net_bh and list manager.
 *		Alan Cox	: 	Fix ETH_P_ALL echoback lengths.
 *		Alan Cox	:	Took out transmit every packet pass
 *					Saved a few bytes in the ioctl handler
 *		Alan Cox	:	Network driver sets packet type before
 *					calling netif_rx. Saves a function
 *					call a packet.
 *		Alan Cox	:	Hashed net_bh()
 *		Richard Kooijman:	Timestamp fixes.
 *		Alan Cox	:	Wrong field in SIOCGIFDSTADDR
 *		Alan Cox	:	Device lock protection.
 *		Alan Cox	: 	Fixed nasty side effect of device close
 *					changes.
 *		Rudi Cilibrasi	:	Pass the right thing to
 *					set_mac_address()
 *		Dave Miller	:	32bit quantity for the device lock to
 *					make it work out on a Sparc.
 *		Bjorn Ekwall	:	Added KERNELD hack.
 *		Alan Cox	:	Cleaned up the backlog initialise.
 *		Craig Metz	:	SIOCGIFCONF fix if space for under
 *					1 device.
 *	    Thomas Bogendoerfer :	Return ENODEV for dev_open, if there
 *					is no device open function.
 *		Andi Kleen	:	Fix error reporting for SIOCGIFCONF
 *	    Michael Chastain	:	Fix signed/unsigned for SIOCGIFCONF
 *		Cyrus Durgin	:	Cleaned for KMOD
 *		Adam Sulmicki   :	Bug Fix : Network Device Unload
 *					A network device unload needs to purge
 *					the backlog queue.
 *	Paul Rusty Russell	:	SIOCSIFNAME
 *              Pekka Riikonen  :	Netdev boot-time settings code
 *              Andrew Morton   :       Make unregister_netdevice wait
 *              			indefinitely on dev->refcnt
 * 		J Hadi Salim	:	- Backlog queue sampling
 *				        - netif_rx() feedback
 */

#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/bitops.h>
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#include <linux/capability.h>
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#include <linux/cpu.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
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#include <linux/mutex.h>
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#include <linux/string.h>
#include <linux/mm.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/notifier.h>
#include <linux/skbuff.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
#include <linux/rtnetlink.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/stat.h>
#include <linux/if_bridge.h>
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#include <linux/if_macvlan.h>
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#include <net/dst.h>
#include <net/pkt_sched.h>
#include <net/checksum.h>
#include <linux/highmem.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/module.h>
#include <linux/kallsyms.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 "net-sysfs.h"

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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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#ifdef CONFIG_NET_DMA
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struct net_dma {
	struct dma_client client;
	spinlock_t lock;
	cpumask_t channel_mask;
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	struct dma_chan **channels;
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};

static enum dma_state_client
netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
	enum dma_state state);

static struct net_dma net_dma = {
	.client = {
		.event_callback = netdev_dma_event,
	},
};
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#endif

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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.
 *
 * Pure readers hold dev_base_lock for reading.
 *
 * 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);

#define NETDEV_HASHBITS	8
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#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
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static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
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{
	unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
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	return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)];
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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 & ((1 << NETDEV_HASHBITS) - 1)];
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}

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/* Device list insertion */
static int list_netdevice(struct net_device *dev)
{
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	struct net *net = dev_net(dev);
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	ASSERT_RTNL();

	write_lock_bh(&dev_base_lock);
	list_add_tail(&dev->dev_list, &net->dev_base_head);
	hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
	hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
	write_unlock_bh(&dev_base_lock);
	return 0;
}

/* Device list removal */
static void unlist_netdevice(struct net_device *dev)
{
	ASSERT_RTNL();

	/* Unlink dev from the device chain */
	write_lock_bh(&dev_base_lock);
	list_del(&dev->dev_list);
	hlist_del(&dev->name_hlist);
	hlist_del(&dev->index_hlist);
	write_unlock_bh(&dev_base_lock);
}

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/*
 *	Our notifier list
 */

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static RAW_NOTIFIER_HEAD(netdev_chain);
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/*
 *	Device drivers call our routines to queue packets here. We empty the
 *	queue in the local softnet handler.
 */
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DEFINE_PER_CPU(struct softnet_data, softnet_data);
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
/*
 * register_netdevice() inits dev->_xmit_lock and sets lockdep class
 * according to dev->type
 */
static const unsigned short netdev_lock_type[] =
	{ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
	 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
	 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
	 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
	 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
	 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
	 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
	 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
	 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
	 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
	 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
	 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
	 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
	 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_VOID,
	 ARPHRD_NONE};

static const char *netdev_lock_name[] =
	{"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
	 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
	 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
	 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
	 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
	 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
	 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
	 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
	 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
	 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
	 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
	 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
	 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
	 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_VOID",
	 "_xmit_NONE"};

static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];

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;
}

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

	i = netdev_lock_pos(dev_type);
	lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
				   netdev_lock_name[i]);
}
#else
static inline void netdev_set_lockdep_class(spinlock_t *lock,
					    unsigned short dev_type)
{
}
#endif
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/*******************************************************************************

		Protocol management and registration routines

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

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

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

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

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

/**
 *	__dev_remove_pack	 - remove packet handler
 *	@pt: packet type declaration
 *
 *	Remove a protocol handler that was previously added to the kernel
 *	protocol handlers by dev_add_pack(). The passed &packet_type is removed
 *	from the kernel lists and can be freed or reused once this function
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 *	returns.
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 *
 *      The packet type might still be in use by receivers
 *	and must not be freed until after all the CPU's have gone
 *	through a quiescent state.
 */
void __dev_remove_pack(struct packet_type *pt)
{
	struct list_head *head;
	struct packet_type *pt1;

	spin_lock_bh(&ptype_lock);

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	if (pt->type == htons(ETH_P_ALL))
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		head = &ptype_all;
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	else
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		head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
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	list_for_each_entry(pt1, head, list) {
		if (pt == pt1) {
			list_del_rcu(&pt->list);
			goto out;
		}
	}

	printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
out:
	spin_unlock_bh(&ptype_lock);
}
/**
 *	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();
}

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

		      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;
}


/**
 *	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
	 */
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	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
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 *	@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.
 */

573
struct net_device *__dev_get_by_name(struct net *net, const char *name)
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{
	struct hlist_node *p;

577
	hlist_for_each(p, dev_name_hash(net, name)) {
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		struct net_device *dev
			= hlist_entry(p, struct net_device, name_hlist);
		if (!strncmp(dev->name, name, IFNAMSIZ))
			return dev;
	}
	return NULL;
}

/**
 *	dev_get_by_name		- find a device by its name
588
 *	@net: the applicable net namespace
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 *	@name: name to find
 *
 *	Find an interface by name. This can be called from any
 *	context and does its own locking. The returned handle has
 *	the usage count incremented and the caller must use dev_put() to
 *	release it when it is no longer needed. %NULL is returned if no
 *	matching device is found.
 */

598
struct net_device *dev_get_by_name(struct net *net, const char *name)
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{
	struct net_device *dev;

	read_lock(&dev_base_lock);
603
	dev = __dev_get_by_name(net, name);
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	if (dev)
		dev_hold(dev);
	read_unlock(&dev_base_lock);
	return dev;
}

/**
 *	__dev_get_by_index - find a device by its ifindex
612
 *	@net: the applicable net namespace
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 *	@ifindex: index of device
 *
 *	Search for an interface by index. Returns %NULL if the device
 *	is not found or a pointer to the device. The device has not
 *	had its reference counter increased so the caller must be careful
 *	about locking. The caller must hold either the RTNL semaphore
 *	or @dev_base_lock.
 */

622
struct net_device *__dev_get_by_index(struct net *net, int ifindex)
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{
	struct hlist_node *p;

626
	hlist_for_each(p, dev_index_hash(net, ifindex)) {
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		struct net_device *dev
			= hlist_entry(p, struct net_device, index_hlist);
		if (dev->ifindex == ifindex)
			return dev;
	}
	return NULL;
}


/**
 *	dev_get_by_index - find a device by its ifindex
638
 *	@net: the applicable net namespace
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 *	@ifindex: index of device
 *
 *	Search for an interface by index. Returns NULL if the device
 *	is not found or a pointer to the device. The device returned has
 *	had a reference added and the pointer is safe until the user calls
 *	dev_put to indicate they have finished with it.
 */

647
struct net_device *dev_get_by_index(struct net *net, int ifindex)
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{
	struct net_device *dev;

	read_lock(&dev_base_lock);
652
	dev = __dev_get_by_index(net, ifindex);
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	if (dev)
		dev_hold(dev);
	read_unlock(&dev_base_lock);
	return dev;
}

/**
 *	dev_getbyhwaddr - find a device by its hardware address
661
 *	@net: the applicable net namespace
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 *	@type: media type of device
 *	@ha: hardware address
 *
 *	Search for an interface by MAC address. Returns NULL if the device
 *	is not found or a pointer to the device. The caller must hold the
 *	rtnl semaphore. The returned device has not had its ref count increased
 *	and the caller must therefore be careful about locking
 *
 *	BUGS:
 *	If the API was consistent this would be __dev_get_by_hwaddr
 */

674
struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
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{
	struct net_device *dev;

	ASSERT_RTNL();

680
	for_each_netdev(net, dev)
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		if (dev->type == type &&
		    !memcmp(dev->dev_addr, ha, dev->addr_len))
683 684 685
			return dev;

	return NULL;
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}

688 689
EXPORT_SYMBOL(dev_getbyhwaddr);

690
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
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{
	struct net_device *dev;

694
	ASSERT_RTNL();
695
	for_each_netdev(net, dev)
696
		if (dev->type == type)
697 698 699
			return dev;

	return NULL;
700 701 702 703
}

EXPORT_SYMBOL(__dev_getfirstbyhwtype);

704
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
705 706 707 708
{
	struct net_device *dev;

	rtnl_lock();
709
	dev = __dev_getfirstbyhwtype(net, type);
710 711
	if (dev)
		dev_hold(dev);
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	rtnl_unlock();
	return dev;
}

EXPORT_SYMBOL(dev_getfirstbyhwtype);

/**
 *	dev_get_by_flags - find any device with given flags
720
 *	@net: the applicable net namespace
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 *	@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
725
 *	is not found or a pointer to the device. The device returned has
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 *	had a reference added and the pointer is safe until the user calls
 *	dev_put to indicate they have finished with it.
 */

730
struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask)
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{
732
	struct net_device *dev, *ret;
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733

734
	ret = NULL;
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	read_lock(&dev_base_lock);
736
	for_each_netdev(net, dev) {
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		if (((dev->flags ^ if_flags) & mask) == 0) {
			dev_hold(dev);
739
			ret = dev;
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			break;
		}
	}
	read_unlock(&dev_base_lock);
744
	return ret;
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}

/**
 *	dev_valid_name - check if name is okay for network device
 *	@name: name string
 *
 *	Network device names need to be valid file names to
752 753
 *	to allow sysfs to work.  We also disallow any kind of
 *	whitespace.
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 */
755
int dev_valid_name(const char *name)
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{
757 758
	if (*name == '\0')
		return 0;
759 760
	if (strlen(name) >= IFNAMSIZ)
		return 0;
761 762 763 764 765 766 767 768 769
	if (!strcmp(name, ".") || !strcmp(name, ".."))
		return 0;

	while (*name) {
		if (*name == '/' || isspace(*name))
			return 0;
		name++;
	}
	return 1;
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}

/**
773 774
 *	__dev_alloc_name - allocate a name for a device
 *	@net: network namespace to allocate the device name in
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775
 *	@name: name format string
776
 *	@buf:  scratch buffer and result name string
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 *
 *	Passed a format string - eg "lt%d" it will try and find a suitable
S
Stephen Hemminger 已提交
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 *	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.
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 */

787
static int __dev_alloc_name(struct net *net, const char *name, char *buf)
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{
	int i = 0;
	const char *p;
	const int max_netdevices = 8*PAGE_SIZE;
S
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792
	unsigned long *inuse;
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	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 */
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Stephen Hemminger 已提交
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		inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
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		if (!inuse)
			return -ENOMEM;

810
		for_each_netdev(net, d) {
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			if (!sscanf(d->name, name, &i))
				continue;
			if (i < 0 || i >= max_netdevices)
				continue;

			/*  avoid cases where sscanf is not exact inverse of printf */
817
			snprintf(buf, IFNAMSIZ, name, i);
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			if (!strncmp(buf, d->name, IFNAMSIZ))
				set_bit(i, inuse);
		}

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

826 827
	snprintf(buf, IFNAMSIZ, name, i);
	if (!__dev_get_by_name(net, buf))
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		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;
}

837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856
/**
 *	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;

857 858
	BUG_ON(!dev_net(dev));
	net = dev_net(dev);
859 860 861 862 863 864
	ret = __dev_alloc_name(net, name, buf);
	if (ret >= 0)
		strlcpy(dev->name, buf, IFNAMSIZ);
	return ret;
}

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/**
 *	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.
 */
int dev_change_name(struct net_device *dev, char *newname)
{
876
	char oldname[IFNAMSIZ];
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	int err = 0;
878
	int ret;
879
	struct net *net;
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	ASSERT_RTNL();
882
	BUG_ON(!dev_net(dev));
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883

884
	net = dev_net(dev);
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	if (dev->flags & IFF_UP)
		return -EBUSY;

	if (!dev_valid_name(newname))
		return -EINVAL;

891 892 893
	if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
		return 0;

894 895
	memcpy(oldname, dev->name, IFNAMSIZ);

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	if (strchr(newname, '%')) {
		err = dev_alloc_name(dev, newname);
		if (err < 0)
			return err;
		strcpy(newname, dev->name);
	}
902
	else if (__dev_get_by_name(net, newname))
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		return -EEXIST;
	else
		strlcpy(dev->name, newname, IFNAMSIZ);

907
rollback:
908 909 910 911 912
	err = device_rename(&dev->dev, dev->name);
	if (err) {
		memcpy(dev->name, oldname, IFNAMSIZ);
		return err;
	}
913 914

	write_lock_bh(&dev_base_lock);
915
	hlist_del(&dev->name_hlist);
916
	hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
917 918
	write_unlock_bh(&dev_base_lock);

919
	ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
920 921 922 923 924 925 926 927 928 929 930 931 932
	ret = notifier_to_errno(ret);

	if (ret) {
		if (err) {
			printk(KERN_ERR
			       "%s: name change rollback failed: %d.\n",
			       dev->name, ret);
		} else {
			err = ret;
			memcpy(dev->name, oldname, IFNAMSIZ);
			goto rollback;
		}
	}
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	return err;
}

937
/**
S
Stephen Hemminger 已提交
938
 *	netdev_features_change - device changes features
939 940 941 942 943 944
 *	@dev: device to cause notification
 *
 *	Called to indicate a device has changed features.
 */
void netdev_features_change(struct net_device *dev)
{
945
	call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
946 947 948
}
EXPORT_SYMBOL(netdev_features_change);

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/**
 *	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) {
960
		call_netdevice_notifiers(NETDEV_CHANGE, dev);
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		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
	}
}

965 966 967 968 969 970
void netdev_bonding_change(struct net_device *dev)
{
	call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev);
}
EXPORT_SYMBOL(netdev_bonding_change);

L
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/**
 *	dev_load 	- load a network module
973
 *	@net: the applicable net namespace
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 *	@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.
 */

981
void dev_load(struct net *net, const char *name)
L
Linus Torvalds 已提交
982
{
983
	struct net_device *dev;
L
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984 985

	read_lock(&dev_base_lock);
986
	dev = __dev_get_by_name(net, name);
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	read_unlock(&dev_base_lock);

	if (!dev && capable(CAP_SYS_MODULE))
		request_module("%s", name);
}

/**
 *	dev_open	- prepare an interface for use.
 *	@dev:	device to open
 *
 *	Takes a device from down to up state. The device's private open
 *	function is invoked and then the multicast lists are loaded. Finally
 *	the device is moved into the up state and a %NETDEV_UP message is
 *	sent to the netdev notifier chain.
 *
 *	Calling this function on an active interface is a nop. On a failure
 *	a negative errno code is returned.
 */
int dev_open(struct net_device *dev)
{
	int ret = 0;

1009 1010
	ASSERT_RTNL();

L
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	/*
	 *	Is it already up?
	 */

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

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

	/*
	 *	Call device private open method
	 */
	set_bit(__LINK_STATE_START, &dev->state);
1028 1029 1030 1031 1032

	if (dev->validate_addr)
		ret = dev->validate_addr(dev);

	if (!ret && dev->open)
L
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1033 1034
		ret = dev->open(dev);

1035
	/*
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1036 1037 1038
	 *	If it went open OK then:
	 */

1039 1040 1041
	if (ret)
		clear_bit(__LINK_STATE_START, &dev->state);
	else {
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		/*
		 *	Set the flags.
		 */
		dev->flags |= IFF_UP;

		/*
		 *	Initialize multicasting status
		 */
1050
		dev_set_rx_mode(dev);
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1051 1052 1053 1054 1055 1056 1057 1058 1059

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

		/*
		 *	... and announce new interface.
		 */
1060
		call_netdevice_notifiers(NETDEV_UP, dev);
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1061
	}
1062

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	return ret;
}

/**
 *	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)
{
1077 1078
	ASSERT_RTNL();

1079 1080
	might_sleep();

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

	/*
	 *	Tell people we are going down, so that they can
	 *	prepare to death, when device is still operating.
	 */
1088
	call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
L
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1089 1090 1091 1092

	clear_bit(__LINK_STATE_START, &dev->state);

	/* Synchronize to scheduled poll. We cannot touch poll list,
1093 1094 1095 1096 1097
	 * 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.
	 */
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	smp_mb__after_clear_bit(); /* Commit netif_running(). */

1100 1101
	dev_deactivate(dev);

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1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120
	/*
	 *	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 (dev->stop)
		dev->stop(dev);

	/*
	 *	Device is now down.
	 */

	dev->flags &= ~IFF_UP;

	/*
	 * Tell people we are down
	 */
1121
	call_netdevice_notifiers(NETDEV_DOWN, dev);
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1122 1123 1124 1125 1126

	return 0;
}


1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149
/**
 *	dev_disable_lro - disable Large Receive Offload on a device
 *	@dev: device
 *
 *	Disable Large Receive Offload (LRO) on a net device.  Must be
 *	called under RTNL.  This is needed if received packets may be
 *	forwarded to another interface.
 */
void dev_disable_lro(struct net_device *dev)
{
	if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
	    dev->ethtool_ops->set_flags) {
		u32 flags = dev->ethtool_ops->get_flags(dev);
		if (flags & ETH_FLAG_LRO) {
			flags &= ~ETH_FLAG_LRO;
			dev->ethtool_ops->set_flags(dev, flags);
		}
	}
	WARN_ON(dev->features & NETIF_F_LRO);
}
EXPORT_SYMBOL(dev_disable_lro);


1150 1151
static int dev_boot_phase = 1;

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1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166
/*
 *	Device change register/unregister. These are not inline or static
 *	as we export them to the world.
 */

/**
 *	register_netdevice_notifier - register a network notifier block
 *	@nb: notifier
 *
 *	Register a notifier to be called when network device events occur.
 *	The notifier passed is linked into the kernel structures and must
 *	not be reused until it has been unregistered. A negative errno code
 *	is returned on a failure.
 *
 * 	When registered all registration and up events are replayed
1167
 *	to the new notifier to allow device to have a race free
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1168 1169 1170 1171 1172 1173
 *	view of the network device list.
 */

int register_netdevice_notifier(struct notifier_block *nb)
{
	struct net_device *dev;
1174
	struct net_device *last;
1175
	struct net *net;
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	int err;

	rtnl_lock();
1179
	err = raw_notifier_chain_register(&netdev_chain, nb);
1180 1181
	if (err)
		goto unlock;
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192
	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
1193

1194 1195
			nb->notifier_call(nb, NETDEV_UP, dev);
		}
L
Linus Torvalds 已提交
1196
	}
1197 1198

unlock:
L
Linus Torvalds 已提交
1199 1200
	rtnl_unlock();
	return err;
1201 1202 1203

rollback:
	last = dev;
1204 1205 1206 1207
	for_each_net(net) {
		for_each_netdev(net, dev) {
			if (dev == last)
				break;
1208

1209 1210 1211 1212 1213
			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);
1214 1215
		}
	}
1216 1217

	raw_notifier_chain_unregister(&netdev_chain, nb);
1218
	goto unlock;
L
Linus Torvalds 已提交
1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232
}

/**
 *	unregister_netdevice_notifier - unregister a network notifier block
 *	@nb: notifier
 *
 *	Unregister a notifier previously registered by
 *	register_netdevice_notifier(). The notifier is unlinked into the
 *	kernel structures and may then be reused. A negative errno code
 *	is returned on a failure.
 */

int unregister_netdevice_notifier(struct notifier_block *nb)
{
1233 1234 1235
	int err;

	rtnl_lock();
1236
	err = raw_notifier_chain_unregister(&netdev_chain, nb);
1237 1238
	rtnl_unlock();
	return err;
L
Linus Torvalds 已提交
1239 1240 1241 1242 1243
}

/**
 *	call_netdevice_notifiers - call all network notifier blocks
 *      @val: value passed unmodified to notifier function
1244
 *      @dev: net_device pointer passed unmodified to notifier function
L
Linus Torvalds 已提交
1245 1246
 *
 *	Call all network notifier blocks.  Parameters and return value
1247
 *	are as for raw_notifier_call_chain().
L
Linus Torvalds 已提交
1248 1249
 */

1250
int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
L
Linus Torvalds 已提交
1251
{
1252
	return raw_notifier_call_chain(&netdev_chain, val, dev);
L
Linus Torvalds 已提交
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267
}

/* When > 0 there are consumers of rx skb time stamps */
static atomic_t netstamp_needed = ATOMIC_INIT(0);

void net_enable_timestamp(void)
{
	atomic_inc(&netstamp_needed);
}

void net_disable_timestamp(void)
{
	atomic_dec(&netstamp_needed);
}

1268
static inline void net_timestamp(struct sk_buff *skb)
L
Linus Torvalds 已提交
1269 1270
{
	if (atomic_read(&netstamp_needed))
1271
		__net_timestamp(skb);
1272 1273
	else
		skb->tstamp.tv64 = 0;
L
Linus Torvalds 已提交
1274 1275 1276 1277 1278 1279 1280
}

/*
 *	Support routine. Sends outgoing frames to any network
 *	taps currently in use.
 */

1281
static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
L
Linus Torvalds 已提交
1282 1283
{
	struct packet_type *ptype;
1284 1285

	net_timestamp(skb);
L
Linus Torvalds 已提交
1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302

	rcu_read_lock();
	list_for_each_entry_rcu(ptype, &ptype_all, list) {
		/* Never send packets back to the socket
		 * they originated from - MvS (miquels@drinkel.ow.org)
		 */
		if ((ptype->dev == dev || !ptype->dev) &&
		    (ptype->af_packet_priv == NULL ||
		     (struct sock *)ptype->af_packet_priv != skb->sk)) {
			struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
			if (!skb2)
				break;

			/* skb->nh should be correctly
			   set by sender, so that the second statement is
			   just protection against buggy protocols.
			 */
1303
			skb_reset_mac_header(skb2);
L
Linus Torvalds 已提交
1304

1305
			if (skb_network_header(skb2) < skb2->data ||
1306
			    skb2->network_header > skb2->tail) {
L
Linus Torvalds 已提交
1307 1308 1309 1310
				if (net_ratelimit())
					printk(KERN_CRIT "protocol %04x is "
					       "buggy, dev %s\n",
					       skb2->protocol, dev->name);
1311
				skb_reset_network_header(skb2);
L
Linus Torvalds 已提交
1312 1313
			}

1314
			skb2->transport_header = skb2->network_header;
L
Linus Torvalds 已提交
1315
			skb2->pkt_type = PACKET_OUTGOING;
D
David S. Miller 已提交
1316
			ptype->func(skb2, skb->dev, ptype, skb->dev);
L
Linus Torvalds 已提交
1317 1318 1319 1320 1321
		}
	}
	rcu_read_unlock();
}

1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338

void __netif_schedule(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
		unsigned long flags;
		struct softnet_data *sd;

		local_irq_save(flags);
		sd = &__get_cpu_var(softnet_data);
		dev->next_sched = sd->output_queue;
		sd->output_queue = dev;
		raise_softirq_irqoff(NET_TX_SOFTIRQ);
		local_irq_restore(flags);
	}
}
EXPORT_SYMBOL(__netif_schedule);

1339
void dev_kfree_skb_irq(struct sk_buff *skb)
1340
{
1341 1342 1343
	if (atomic_dec_and_test(&skb->users)) {
		struct softnet_data *sd;
		unsigned long flags;
1344

1345 1346 1347 1348 1349 1350 1351
		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);
	}
1352
}
1353
EXPORT_SYMBOL(dev_kfree_skb_irq);
1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364

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);


1365 1366 1367 1368 1369 1370
/**
 * netif_device_detach - mark device as removed
 * @dev: network device
 *
 * Mark device as removed from system and therefore no longer available.
 */
1371 1372 1373 1374 1375 1376 1377 1378 1379
void netif_device_detach(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
		netif_stop_queue(dev);
	}
}
EXPORT_SYMBOL(netif_device_detach);

1380 1381 1382 1383 1384 1385
/**
 * netif_device_attach - mark device as attached
 * @dev: network device
 *
 * Mark device as attached from system and restart if needed.
 */
1386 1387 1388 1389 1390
void netif_device_attach(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
		netif_wake_queue(dev);
1391
		__netdev_watchdog_up(dev);
1392 1393 1394 1395
	}
}
EXPORT_SYMBOL(netif_device_attach);

1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418
static bool can_checksum_protocol(unsigned long features, __be16 protocol)
{
	return ((features & NETIF_F_GEN_CSUM) ||
		((features & NETIF_F_IP_CSUM) &&
		 protocol == htons(ETH_P_IP)) ||
		((features & NETIF_F_IPV6_CSUM) &&
		 protocol == htons(ETH_P_IPV6)));
}

static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
{
	if (can_checksum_protocol(dev->features, skb->protocol))
		return true;

	if (skb->protocol == htons(ETH_P_8021Q)) {
		struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
		if (can_checksum_protocol(dev->features & dev->vlan_features,
					  veh->h_vlan_encapsulated_proto))
			return true;
	}

	return false;
}
1419

L
Linus Torvalds 已提交
1420 1421 1422 1423
/*
 * Invalidate hardware checksum when packet is to be mangled, and
 * complete checksum manually on outgoing path.
 */
1424
int skb_checksum_help(struct sk_buff *skb)
L
Linus Torvalds 已提交
1425
{
1426
	__wsum csum;
1427
	int ret = 0, offset;
L
Linus Torvalds 已提交
1428

1429
	if (skb->ip_summed == CHECKSUM_COMPLETE)
1430 1431 1432 1433 1434
		goto out_set_summed;

	if (unlikely(skb_shinfo(skb)->gso_size)) {
		/* Let GSO fix up the checksum. */
		goto out_set_summed;
L
Linus Torvalds 已提交
1435 1436
	}

1437 1438 1439 1440 1441 1442 1443 1444 1445
	offset = skb->csum_start - skb_headroom(skb);
	BUG_ON(offset >= skb_headlen(skb));
	csum = skb_checksum(skb, offset, skb->len - offset, 0);

	offset += skb->csum_offset;
	BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));

	if (skb_cloned(skb) &&
	    !skb_clone_writable(skb, offset + sizeof(__sum16))) {
L
Linus Torvalds 已提交
1446 1447 1448 1449 1450
		ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
		if (ret)
			goto out;
	}

1451
	*(__sum16 *)(skb->data + offset) = csum_fold(csum);
1452
out_set_summed:
L
Linus Torvalds 已提交
1453
	skb->ip_summed = CHECKSUM_NONE;
1454
out:
L
Linus Torvalds 已提交
1455 1456 1457
	return ret;
}

1458 1459 1460
/**
 *	skb_gso_segment - Perform segmentation on skb.
 *	@skb: buffer to segment
1461
 *	@features: features for the output path (see dev->features)
1462 1463
 *
 *	This function segments the given skb and returns a list of segments.
1464 1465 1466
 *
 *	It may return NULL if the skb requires no segmentation.  This is
 *	only possible when GSO is used for verifying header integrity.
1467
 */
1468
struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1469 1470 1471
{
	struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
	struct packet_type *ptype;
A
Al Viro 已提交
1472
	__be16 type = skb->protocol;
1473
	int err;
1474 1475 1476

	BUG_ON(skb_shinfo(skb)->frag_list);

1477
	skb_reset_mac_header(skb);
1478
	skb->mac_len = skb->network_header - skb->mac_header;
1479 1480
	__skb_pull(skb, skb->mac_len);

1481
	if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) {
1482 1483 1484 1485 1486
		if (skb_header_cloned(skb) &&
		    (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
			return ERR_PTR(err);
	}

1487
	rcu_read_lock();
1488 1489
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1490
		if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1491
			if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1492 1493 1494 1495
				err = ptype->gso_send_check(skb);
				segs = ERR_PTR(err);
				if (err || skb_gso_ok(skb, features))
					break;
1496 1497
				__skb_push(skb, (skb->data -
						 skb_network_header(skb)));
1498
			}
1499
			segs = ptype->gso_segment(skb, features);
1500 1501 1502 1503 1504
			break;
		}
	}
	rcu_read_unlock();

1505
	__skb_push(skb, skb->data - skb_mac_header(skb));
1506

1507 1508 1509 1510 1511
	return segs;
}

EXPORT_SYMBOL(skb_gso_segment);

1512 1513 1514 1515 1516
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG
void netdev_rx_csum_fault(struct net_device *dev)
{
	if (net_ratelimit()) {
1517
		printk(KERN_ERR "%s: hw csum failure.\n",
1518
			dev ? dev->name : "<unknown>");
1519 1520 1521 1522 1523 1524
		dump_stack();
	}
}
EXPORT_SYMBOL(netdev_rx_csum_fault);
#endif

L
Linus Torvalds 已提交
1525 1526 1527 1528 1529 1530 1531
/* Actually, we should eliminate this check as soon as we know, that:
 * 1. IOMMU is present and allows to map all the memory.
 * 2. No high memory really exists on this machine.
 */

static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
{
1532
#ifdef CONFIG_HIGHMEM
L
Linus Torvalds 已提交
1533 1534 1535 1536 1537 1538 1539 1540 1541
	int i;

	if (dev->features & NETIF_F_HIGHDMA)
		return 0;

	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
		if (PageHighMem(skb_shinfo(skb)->frags[i].page))
			return 1;

1542
#endif
L
Linus Torvalds 已提交
1543 1544 1545
	return 0;
}

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 1575 1576 1577 1578 1579
struct dev_gso_cb {
	void (*destructor)(struct sk_buff *skb);
};

#define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)

static void dev_gso_skb_destructor(struct sk_buff *skb)
{
	struct dev_gso_cb *cb;

	do {
		struct sk_buff *nskb = skb->next;

		skb->next = nskb->next;
		nskb->next = NULL;
		kfree_skb(nskb);
	} while (skb->next);

	cb = DEV_GSO_CB(skb);
	if (cb->destructor)
		cb->destructor(skb);
}

/**
 *	dev_gso_segment - Perform emulated hardware segmentation on skb.
 *	@skb: buffer to segment
 *
 *	This function segments the given skb and stores the list of segments
 *	in skb->next.
 */
static int dev_gso_segment(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	struct sk_buff *segs;
1580 1581 1582 1583 1584 1585 1586 1587
	int features = dev->features & ~(illegal_highdma(dev, skb) ?
					 NETIF_F_SG : 0);

	segs = skb_gso_segment(skb, features);

	/* Verifying header integrity only. */
	if (!segs)
		return 0;
1588

1589
	if (IS_ERR(segs))
1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601
		return PTR_ERR(segs);

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

	return 0;
}

int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	if (likely(!skb->next)) {
S
Stephen Hemminger 已提交
1602
		if (!list_empty(&ptype_all))
1603 1604
			dev_queue_xmit_nit(skb, dev);

1605 1606 1607 1608 1609 1610
		if (netif_needs_gso(dev, skb)) {
			if (unlikely(dev_gso_segment(skb)))
				goto out_kfree_skb;
			if (skb->next)
				goto gso;
		}
1611

1612
		return dev->hard_start_xmit(skb, dev);
1613 1614
	}

1615
gso:
1616 1617 1618 1619 1620 1621 1622 1623
	do {
		struct sk_buff *nskb = skb->next;
		int rc;

		skb->next = nskb->next;
		nskb->next = NULL;
		rc = dev->hard_start_xmit(nskb, dev);
		if (unlikely(rc)) {
1624
			nskb->next = skb->next;
1625 1626 1627
			skb->next = nskb;
			return rc;
		}
1628
		if (unlikely((netif_queue_stopped(dev) ||
1629
			     netif_subqueue_stopped(dev, skb)) &&
1630
			     skb->next))
1631
			return NETDEV_TX_BUSY;
1632
	} while (skb->next);
1633

1634 1635 1636 1637 1638 1639 1640
	skb->destructor = DEV_GSO_CB(skb)->destructor;

out_kfree_skb:
	kfree_skb(skb);
	return 0;
}

L
Linus Torvalds 已提交
1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651
/**
 *	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.
1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664
 *
 * -----------------------------------------------------------------------------------
 *      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
1665 1666 1667 1668 1669 1670 1671 1672
 */

int dev_queue_xmit(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	struct Qdisc *q;
	int rc = -ENOMEM;

1673 1674 1675 1676
	/* GSO will handle the following emulations directly. */
	if (netif_needs_gso(dev, skb))
		goto gso;

L
Linus Torvalds 已提交
1677 1678
	if (skb_shinfo(skb)->frag_list &&
	    !(dev->features & NETIF_F_FRAGLIST) &&
H
Herbert Xu 已提交
1679
	    __skb_linearize(skb))
L
Linus Torvalds 已提交
1680 1681 1682 1683 1684 1685 1686 1687
		goto out_kfree_skb;

	/* Fragmented skb is linearized if device does not support SG,
	 * or if at least one of fragments is in highmem and device
	 * does not support DMA from it.
	 */
	if (skb_shinfo(skb)->nr_frags &&
	    (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
H
Herbert Xu 已提交
1688
	    __skb_linearize(skb))
L
Linus Torvalds 已提交
1689 1690 1691 1692 1693
		goto out_kfree_skb;

	/* If packet is not checksummed and device does not support
	 * checksumming for this protocol, complete checksumming here.
	 */
1694 1695 1696
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
		skb_set_transport_header(skb, skb->csum_start -
					      skb_headroom(skb));
1697 1698
		if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
			goto out_kfree_skb;
1699
	}
L
Linus Torvalds 已提交
1700

1701
gso:
1702 1703
	spin_lock_prefetch(&dev->queue_lock);

1704 1705
	/* Disable soft irqs for various locks below. Also
	 * stops preemption for RCU.
L
Linus Torvalds 已提交
1706
	 */
1707
	rcu_read_lock_bh();
L
Linus Torvalds 已提交
1708

1709 1710 1711
	/* Updates of qdisc are serialized by queue_lock.
	 * The struct Qdisc which is pointed to by qdisc is now a
	 * rcu structure - it may be accessed without acquiring
L
Linus Torvalds 已提交
1712
	 * a lock (but the structure may be stale.) The freeing of the
1713
	 * qdisc will be deferred until it's known that there are no
L
Linus Torvalds 已提交
1714
	 * more references to it.
1715 1716
	 *
	 * If the qdisc has an enqueue function, we still need to
L
Linus Torvalds 已提交
1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727
	 * hold the queue_lock before calling it, since queue_lock
	 * also serializes access to the device queue.
	 */

	q = rcu_dereference(dev->qdisc);
#ifdef CONFIG_NET_CLS_ACT
	skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
#endif
	if (q->enqueue) {
		/* Grab device queue */
		spin_lock(&dev->queue_lock);
1728 1729
		q = dev->qdisc;
		if (q->enqueue) {
1730
			/* reset queue_mapping to zero */
1731
			skb_set_queue_mapping(skb, 0);
1732 1733 1734
			rc = q->enqueue(skb, q);
			qdisc_run(dev);
			spin_unlock(&dev->queue_lock);
L
Linus Torvalds 已提交
1735

1736 1737 1738
			rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
			goto out;
		}
L
Linus Torvalds 已提交
1739 1740 1741 1742 1743 1744
		spin_unlock(&dev->queue_lock);
	}

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

H
Herbert Xu 已提交
1745 1746
	   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
1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760
	   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 */

		if (dev->xmit_lock_owner != cpu) {

			HARD_TX_LOCK(dev, cpu);

1761
			if (!netif_queue_stopped(dev) &&
1762
			    !netif_subqueue_stopped(dev, skb)) {
L
Linus Torvalds 已提交
1763
				rc = 0;
1764
				if (!dev_hard_start_xmit(skb, dev)) {
L
Linus Torvalds 已提交
1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782
					HARD_TX_UNLOCK(dev);
					goto out;
				}
			}
			HARD_TX_UNLOCK(dev);
			if (net_ratelimit())
				printk(KERN_CRIT "Virtual device %s asks to "
				       "queue packet!\n", dev->name);
		} else {
			/* Recursion is detected! It is possible,
			 * unfortunately */
			if (net_ratelimit())
				printk(KERN_CRIT "Dead loop on virtual device "
				       "%s, fix it urgently!\n", dev->name);
		}
	}

	rc = -ENETDOWN;
1783
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
1784 1785 1786 1787 1788

out_kfree_skb:
	kfree_skb(skb);
	return rc;
out:
1789
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
1790 1791 1792 1793 1794 1795 1796 1797
	return rc;
}


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

1798 1799 1800
int netdev_max_backlog __read_mostly = 1000;
int netdev_budget __read_mostly = 300;
int weight_p __read_mostly = 64;            /* old backlog weight */
L
Linus Torvalds 已提交
1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828

DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };


/**
 *	netif_rx	-	post buffer to the network code
 *	@skb: buffer to post
 *
 *	This function receives a packet from a device driver and queues it for
 *	the upper (protocol) levels to process.  It always succeeds. The buffer
 *	may be dropped during processing for congestion control or by the
 *	protocol layers.
 *
 *	return values:
 *	NET_RX_SUCCESS	(no congestion)
 *	NET_RX_DROP     (packet was dropped)
 *
 */

int netif_rx(struct sk_buff *skb)
{
	struct softnet_data *queue;
	unsigned long flags;

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

1829
	if (!skb->tstamp.tv64)
1830
		net_timestamp(skb);
L
Linus Torvalds 已提交
1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845

	/*
	 * The code is rearranged so that the path is the most
	 * short when CPU is congested, but is still operating.
	 */
	local_irq_save(flags);
	queue = &__get_cpu_var(softnet_data);

	__get_cpu_var(netdev_rx_stat).total++;
	if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
		if (queue->input_pkt_queue.qlen) {
enqueue:
			dev_hold(skb->dev);
			__skb_queue_tail(&queue->input_pkt_queue, skb);
			local_irq_restore(flags);
1846
			return NET_RX_SUCCESS;
L
Linus Torvalds 已提交
1847 1848
		}

1849
		napi_schedule(&queue->backlog);
L
Linus Torvalds 已提交
1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874
		goto enqueue;
	}

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

	kfree_skb(skb);
	return NET_RX_DROP;
}

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);

D
David S. Miller 已提交
1875
static inline struct net_device *skb_bond(struct sk_buff *skb)
L
Linus Torvalds 已提交
1876 1877 1878
{
	struct net_device *dev = skb->dev;

1879
	if (dev->master) {
1880
		if (skb_bond_should_drop(skb)) {
1881 1882 1883
			kfree_skb(skb);
			return NULL;
		}
L
Linus Torvalds 已提交
1884
		skb->dev = dev->master;
1885
	}
D
David S. Miller 已提交
1886 1887

	return dev;
L
Linus Torvalds 已提交
1888 1889
}

1890

L
Linus Torvalds 已提交
1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936
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;

			BUG_TRAP(!atomic_read(&skb->users));
			__kfree_skb(skb);
		}
	}

	if (sd->output_queue) {
		struct net_device *head;

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

		while (head) {
			struct net_device *dev = head;
			head = head->next_sched;

			smp_mb__before_clear_bit();
			clear_bit(__LINK_STATE_SCHED, &dev->state);

			if (spin_trylock(&dev->queue_lock)) {
				qdisc_run(dev);
				spin_unlock(&dev->queue_lock);
			} else {
				netif_schedule(dev);
			}
		}
	}
}

1937 1938 1939
static inline int deliver_skb(struct sk_buff *skb,
			      struct packet_type *pt_prev,
			      struct net_device *orig_dev)
L
Linus Torvalds 已提交
1940 1941
{
	atomic_inc(&skb->users);
D
David S. Miller 已提交
1942
	return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
1943 1944 1945
}

#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1946
/* These hooks defined here for ATM */
L
Linus Torvalds 已提交
1947 1948 1949
struct net_bridge;
struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
						unsigned char *addr);
1950
void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
L
Linus Torvalds 已提交
1951

1952 1953 1954 1955 1956 1957 1958 1959 1960
/*
 * If bridge module is loaded call bridging hook.
 *  returns NULL if packet was consumed.
 */
struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
					struct sk_buff *skb) __read_mostly;
static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
					    struct packet_type **pt_prev, int *ret,
					    struct net_device *orig_dev)
L
Linus Torvalds 已提交
1961 1962 1963
{
	struct net_bridge_port *port;

1964 1965 1966
	if (skb->pkt_type == PACKET_LOOPBACK ||
	    (port = rcu_dereference(skb->dev->br_port)) == NULL)
		return skb;
L
Linus Torvalds 已提交
1967 1968

	if (*pt_prev) {
1969
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
L
Linus Torvalds 已提交
1970
		*pt_prev = NULL;
1971 1972
	}

1973
	return br_handle_frame_hook(port, skb);
L
Linus Torvalds 已提交
1974 1975
}
#else
1976
#define handle_bridge(skb, pt_prev, ret, orig_dev)	(skb)
L
Linus Torvalds 已提交
1977 1978
#endif

P
Patrick McHardy 已提交
1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
#if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);

static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
					     struct packet_type **pt_prev,
					     int *ret,
					     struct net_device *orig_dev)
{
	if (skb->dev->macvlan_port == NULL)
		return skb;

	if (*pt_prev) {
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
		*pt_prev = NULL;
	}
	return macvlan_handle_frame_hook(skb);
}
#else
#define handle_macvlan(skb, pt_prev, ret, orig_dev)	(skb)
#endif

L
Linus Torvalds 已提交
2001 2002 2003 2004 2005
#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
2006
 * NOTE: This doesnt stop any functionality; if you dont have
L
Linus Torvalds 已提交
2007 2008 2009
 * the ingress scheduler, you just cant add policies on ingress.
 *
 */
2010
static int ing_filter(struct sk_buff *skb)
L
Linus Torvalds 已提交
2011 2012 2013 2014
{
	struct Qdisc *q;
	struct net_device *dev = skb->dev;
	int result = TC_ACT_OK;
2015
	u32 ttl = G_TC_RTTL(skb->tc_verd);
2016

2017 2018 2019 2020 2021 2022
	if (MAX_RED_LOOP < ttl++) {
		printk(KERN_WARNING
		       "Redir loop detected Dropping packet (%d->%d)\n",
		       skb->iif, dev->ifindex);
		return TC_ACT_SHOT;
	}
L
Linus Torvalds 已提交
2023

2024 2025
	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
2026

2027 2028 2029 2030 2031 2032 2033
	spin_lock(&dev->ingress_lock);
	if ((q = dev->qdisc_ingress) != NULL)
		result = q->enqueue(skb, q);
	spin_unlock(&dev->ingress_lock);

	return result;
}
2034

2035 2036 2037 2038 2039 2040
static inline struct sk_buff *handle_ing(struct sk_buff *skb,
					 struct packet_type **pt_prev,
					 int *ret, struct net_device *orig_dev)
{
	if (!skb->dev->qdisc_ingress)
		goto out;
L
Linus Torvalds 已提交
2041

2042 2043 2044 2045 2046 2047
	if (*pt_prev) {
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
		*pt_prev = NULL;
	} else {
		/* Huh? Why does turning on AF_PACKET affect this? */
		skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
L
Linus Torvalds 已提交
2048 2049
	}

2050 2051 2052 2053 2054 2055 2056 2057 2058 2059
	switch (ing_filter(skb)) {
	case TC_ACT_SHOT:
	case TC_ACT_STOLEN:
		kfree_skb(skb);
		return NULL;
	}

out:
	skb->tc_verd = 0;
	return skb;
L
Linus Torvalds 已提交
2060 2061 2062
}
#endif

2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077
/**
 *	netif_receive_skb - process receive buffer from network
 *	@skb: buffer to process
 *
 *	netif_receive_skb() is the main receive data processing function.
 *	It always succeeds. The buffer may be dropped during processing
 *	for congestion control or by the protocol layers.
 *
 *	This function may only be called from softirq context and interrupts
 *	should be enabled.
 *
 *	Return values (usually ignored):
 *	NET_RX_SUCCESS: no congestion
 *	NET_RX_DROP: packet was dropped
 */
L
Linus Torvalds 已提交
2078 2079 2080
int netif_receive_skb(struct sk_buff *skb)
{
	struct packet_type *ptype, *pt_prev;
D
David S. Miller 已提交
2081
	struct net_device *orig_dev;
L
Linus Torvalds 已提交
2082
	int ret = NET_RX_DROP;
A
Al Viro 已提交
2083
	__be16 type;
L
Linus Torvalds 已提交
2084 2085

	/* if we've gotten here through NAPI, check netpoll */
2086
	if (netpoll_receive_skb(skb))
L
Linus Torvalds 已提交
2087 2088
		return NET_RX_DROP;

2089
	if (!skb->tstamp.tv64)
2090
		net_timestamp(skb);
L
Linus Torvalds 已提交
2091

2092 2093
	if (!skb->iif)
		skb->iif = skb->dev->ifindex;
2094

D
David S. Miller 已提交
2095
	orig_dev = skb_bond(skb);
L
Linus Torvalds 已提交
2096

2097 2098 2099
	if (!orig_dev)
		return NET_RX_DROP;

L
Linus Torvalds 已提交
2100 2101
	__get_cpu_var(netdev_rx_stat).total++;

2102
	skb_reset_network_header(skb);
2103
	skb_reset_transport_header(skb);
2104
	skb->mac_len = skb->network_header - skb->mac_header;
L
Linus Torvalds 已提交
2105 2106 2107 2108 2109

	pt_prev = NULL;

	rcu_read_lock();

2110 2111 2112 2113
	/* Don't receive packets in an exiting network namespace */
	if (!net_alive(dev_net(skb->dev)))
		goto out;

L
Linus Torvalds 已提交
2114 2115 2116 2117 2118 2119 2120 2121 2122
#ifdef CONFIG_NET_CLS_ACT
	if (skb->tc_verd & TC_NCLS) {
		skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
		goto ncls;
	}
#endif

	list_for_each_entry_rcu(ptype, &ptype_all, list) {
		if (!ptype->dev || ptype->dev == skb->dev) {
2123
			if (pt_prev)
D
David S. Miller 已提交
2124
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2125 2126 2127 2128 2129
			pt_prev = ptype;
		}
	}

#ifdef CONFIG_NET_CLS_ACT
2130 2131
	skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
	if (!skb)
L
Linus Torvalds 已提交
2132 2133 2134 2135
		goto out;
ncls:
#endif

2136
	skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
P
Patrick McHardy 已提交
2137 2138 2139
	if (!skb)
		goto out;
	skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2140
	if (!skb)
L
Linus Torvalds 已提交
2141 2142 2143
		goto out;

	type = skb->protocol;
2144 2145
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
L
Linus Torvalds 已提交
2146 2147
		if (ptype->type == type &&
		    (!ptype->dev || ptype->dev == skb->dev)) {
2148
			if (pt_prev)
D
David S. Miller 已提交
2149
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2150 2151 2152 2153 2154
			pt_prev = ptype;
		}
	}

	if (pt_prev) {
D
David S. Miller 已提交
2155
		ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168
	} else {
		kfree_skb(skb);
		/* Jamal, now you will not able to escape explaining
		 * me how you were going to use this. :-)
		 */
		ret = NET_RX_DROP;
	}

out:
	rcu_read_unlock();
	return ret;
}

2169
static int process_backlog(struct napi_struct *napi, int quota)
L
Linus Torvalds 已提交
2170 2171 2172 2173 2174
{
	int work = 0;
	struct softnet_data *queue = &__get_cpu_var(softnet_data);
	unsigned long start_time = jiffies;

2175 2176
	napi->weight = weight_p;
	do {
L
Linus Torvalds 已提交
2177 2178 2179 2180 2181
		struct sk_buff *skb;
		struct net_device *dev;

		local_irq_disable();
		skb = __skb_dequeue(&queue->input_pkt_queue);
2182 2183 2184 2185 2186 2187
		if (!skb) {
			__napi_complete(napi);
			local_irq_enable();
			break;
		}

L
Linus Torvalds 已提交
2188 2189 2190 2191 2192 2193 2194
		local_irq_enable();

		dev = skb->dev;

		netif_receive_skb(skb);

		dev_put(dev);
2195
	} while (++work < quota && jiffies == start_time);
L
Linus Torvalds 已提交
2196

2197 2198
	return work;
}
L
Linus Torvalds 已提交
2199

2200 2201
/**
 * __napi_schedule - schedule for receive
2202
 * @n: entry to schedule
2203 2204 2205
 *
 * The entry's receive function will be scheduled to run
 */
H
Harvey Harrison 已提交
2206
void __napi_schedule(struct napi_struct *n)
2207 2208
{
	unsigned long flags;
L
Linus Torvalds 已提交
2209

2210 2211 2212 2213
	local_irq_save(flags);
	list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
	__raise_softirq_irqoff(NET_RX_SOFTIRQ);
	local_irq_restore(flags);
L
Linus Torvalds 已提交
2214
}
2215 2216
EXPORT_SYMBOL(__napi_schedule);

L
Linus Torvalds 已提交
2217 2218 2219

static void net_rx_action(struct softirq_action *h)
{
2220
	struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
L
Linus Torvalds 已提交
2221
	unsigned long start_time = jiffies;
2222
	int budget = netdev_budget;
2223 2224
	void *have;

L
Linus Torvalds 已提交
2225 2226
	local_irq_disable();

2227 2228 2229
	while (!list_empty(list)) {
		struct napi_struct *n;
		int work, weight;
L
Linus Torvalds 已提交
2230

2231 2232 2233 2234 2235 2236 2237 2238
		/* If softirq window is exhuasted then punt.
		 *
		 * Note that this is a slight policy change from the
		 * previous NAPI code, which would allow up to 2
		 * jiffies to pass before breaking out.  The test
		 * used to be "jiffies - start_time > 1".
		 */
		if (unlikely(budget <= 0 || jiffies != start_time))
L
Linus Torvalds 已提交
2239 2240 2241 2242
			goto softnet_break;

		local_irq_enable();

2243 2244 2245 2246 2247 2248
		/* Even though interrupts have been re-enabled, this
		 * access is safe because interrupts can only add new
		 * entries to the tail of this list, and only ->poll()
		 * calls can remove this head entry from the list.
		 */
		n = list_entry(list->next, struct napi_struct, poll_list);
L
Linus Torvalds 已提交
2249

2250 2251 2252 2253
		have = netpoll_poll_lock(n);

		weight = n->weight;

2254 2255 2256 2257 2258 2259 2260 2261 2262
		/* This NAPI_STATE_SCHED test is for avoiding a race
		 * with netpoll's poll_napi().  Only the entity which
		 * obtains the lock and sees NAPI_STATE_SCHED set will
		 * actually make the ->poll() call.  Therefore we avoid
		 * accidently calling ->poll() when NAPI is not scheduled.
		 */
		work = 0;
		if (test_bit(NAPI_STATE_SCHED, &n->state))
			work = n->poll(n, weight);
2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274

		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.
		 */
2275 2276 2277 2278 2279 2280
		if (unlikely(work == weight)) {
			if (unlikely(napi_disable_pending(n)))
				__napi_complete(n);
			else
				list_move_tail(&n->poll_list, list);
		}
2281 2282

		netpoll_poll_unlock(have);
L
Linus Torvalds 已提交
2283 2284
	}
out:
2285
	local_irq_enable();
2286

2287 2288 2289 2290 2291
#ifdef CONFIG_NET_DMA
	/*
	 * There may not be any more sk_buffs coming right now, so push
	 * any pending DMA copies to hardware
	 */
2292 2293 2294 2295 2296 2297 2298
	if (!cpus_empty(net_dma.channel_mask)) {
		int chan_idx;
		for_each_cpu_mask(chan_idx, net_dma.channel_mask) {
			struct dma_chan *chan = net_dma.channels[chan_idx];
			if (chan)
				dma_async_memcpy_issue_pending(chan);
		}
2299 2300
	}
#endif
2301

L
Linus Torvalds 已提交
2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340
	return;

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

static gifconf_func_t * gifconf_list [NPROTO];

/**
 *	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.
 */
int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
{
	if (family >= NPROTO)
		return -EINVAL;
	gifconf_list[family] = gifconf;
	return 0;
}


/*
 *	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
 */

2341
static int dev_ifname(struct net *net, struct ifreq __user *arg)
L
Linus Torvalds 已提交
2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353
{
	struct net_device *dev;
	struct ifreq ifr;

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

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

	read_lock(&dev_base_lock);
2354
	dev = __dev_get_by_index(net, ifr.ifr_ifindex);
L
Linus Torvalds 已提交
2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373
	if (!dev) {
		read_unlock(&dev_base_lock);
		return -ENODEV;
	}

	strcpy(ifr.ifr_name, dev->name);
	read_unlock(&dev_base_lock);

	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'.
 */

2374
static int dev_ifconf(struct net *net, char __user *arg)
L
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2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397
{
	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;
2398
	for_each_netdev(net, dev) {
L
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2399 2400 2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411
		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;
			}
		}
2412
	}
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2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429

	/*
	 *	All done.  Write the updated control block back to the caller.
	 */
	ifc.ifc_len = total;

	/*
	 * 	Both BSD and Solaris return 0 here, so we do too.
	 */
	return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
}

#ifdef CONFIG_PROC_FS
/*
 *	This is invoked by the /proc filesystem handler to display a device
 *	in detail.
 */
2430
void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2431
	__acquires(dev_base_lock)
L
Linus Torvalds 已提交
2432
{
2433
	struct net *net = seq_file_net(seq);
2434
	loff_t off;
L
Linus Torvalds 已提交
2435 2436
	struct net_device *dev;

2437 2438 2439
	read_lock(&dev_base_lock);
	if (!*pos)
		return SEQ_START_TOKEN;
L
Linus Torvalds 已提交
2440

2441
	off = 1;
2442
	for_each_netdev(net, dev)
2443 2444
		if (off++ == *pos)
			return dev;
L
Linus Torvalds 已提交
2445

2446
	return NULL;
L
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2447 2448 2449 2450
}

void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
2451
	struct net *net = seq_file_net(seq);
L
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2452
	++*pos;
2453
	return v == SEQ_START_TOKEN ?
2454
		first_net_device(net) : next_net_device((struct net_device *)v);
L
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2455 2456 2457
}

void dev_seq_stop(struct seq_file *seq, void *v)
2458
	__releases(dev_base_lock)
L
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2459 2460 2461 2462 2463 2464
{
	read_unlock(&dev_base_lock);
}

static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
R
Rusty Russell 已提交
2465
	struct net_device_stats *stats = dev->get_stats(dev);
L
Linus Torvalds 已提交
2466

2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483
	seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
		   "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
		   dev->name, stats->rx_bytes, stats->rx_packets,
		   stats->rx_errors,
		   stats->rx_dropped + stats->rx_missed_errors,
		   stats->rx_fifo_errors,
		   stats->rx_length_errors + stats->rx_over_errors +
		    stats->rx_crc_errors + stats->rx_frame_errors,
		   stats->rx_compressed, stats->multicast,
		   stats->tx_bytes, stats->tx_packets,
		   stats->tx_errors, stats->tx_dropped,
		   stats->tx_fifo_errors, stats->collisions,
		   stats->tx_carrier_errors +
		    stats->tx_aborted_errors +
		    stats->tx_window_errors +
		    stats->tx_heartbeat_errors,
		   stats->tx_compressed);
L
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2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506
}

/*
 *	Called from the PROCfs module. This now uses the new arbitrary sized
 *	/proc/net interface to create /proc/net/dev
 */
static int dev_seq_show(struct seq_file *seq, void *v)
{
	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "Inter-|   Receive                            "
			      "                    |  Transmit\n"
			      " face |bytes    packets errs drop fifo frame "
			      "compressed multicast|bytes    packets errs "
			      "drop fifo colls carrier compressed\n");
	else
		dev_seq_printf_stats(seq, v);
	return 0;
}

static struct netif_rx_stats *softnet_get_online(loff_t *pos)
{
	struct netif_rx_stats *rc = NULL;

2507
	while (*pos < nr_cpu_ids)
2508
		if (cpu_online(*pos)) {
L
Linus Torvalds 已提交
2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535
			rc = &per_cpu(netdev_rx_stat, *pos);
			break;
		} else
			++*pos;
	return rc;
}

static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
{
	return softnet_get_online(pos);
}

static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	++*pos;
	return softnet_get_online(pos);
}

static void softnet_seq_stop(struct seq_file *seq, void *v)
{
}

static int softnet_seq_show(struct seq_file *seq, void *v)
{
	struct netif_rx_stats *s = v;

	seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2536
		   s->total, s->dropped, s->time_squeeze, 0,
2537 2538
		   0, 0, 0, 0, /* was fastroute */
		   s->cpu_collision );
L
Linus Torvalds 已提交
2539 2540 2541
	return 0;
}

2542
static const struct seq_operations dev_seq_ops = {
L
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2543 2544 2545 2546 2547 2548 2549 2550
	.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)
{
2551 2552
	return seq_open_net(inode, file, &dev_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
2553 2554
}

2555
static const struct file_operations dev_seq_fops = {
L
Linus Torvalds 已提交
2556 2557 2558 2559
	.owner	 = THIS_MODULE,
	.open    = dev_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
2560
	.release = seq_release_net,
L
Linus Torvalds 已提交
2561 2562
};

2563
static const struct seq_operations softnet_seq_ops = {
L
Linus Torvalds 已提交
2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574
	.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);
}

2575
static const struct file_operations softnet_seq_fops = {
L
Linus Torvalds 已提交
2576 2577 2578 2579 2580 2581 2582
	.owner	 = THIS_MODULE,
	.open    = softnet_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release,
};

2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594
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;
	}

2595
	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
2596 2597 2598 2599 2600 2601 2602 2603 2604 2605
		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)
2606
	__acquires(RCU)
2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629
{
	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
2630
		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
2631 2632

	while (nxt == &ptype_base[hash]) {
2633
		if (++hash >= PTYPE_HASH_SIZE)
2634 2635 2636 2637 2638 2639 2640 2641
			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)
2642
	__releases(RCU)
2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677
{
	rcu_read_unlock();
}

static void ptype_seq_decode(struct seq_file *seq, void *sym)
{
#ifdef CONFIG_KALLSYMS
	unsigned long offset = 0, symsize;
	const char *symname;
	char *modname;
	char namebuf[128];

	symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset,
				  &modname, namebuf);

	if (symname) {
		char *delim = ":";

		if (!modname)
			modname = delim = "";
		seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim,
			   symname, offset);
		return;
	}
#endif

	seq_printf(seq, "[%p]", sym);
}

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");
2678
	else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701
		if (pt->type == htons(ETH_P_ALL))
			seq_puts(seq, "ALL ");
		else
			seq_printf(seq, "%04x", ntohs(pt->type));

		seq_printf(seq, " %-8s ",
			   pt->dev ? pt->dev->name : "");
		ptype_seq_decode(seq,  pt->func);
		seq_putc(seq, '\n');
	}

	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)
{
2702 2703
	return seq_open_net(inode, file, &ptype_seq_ops,
			sizeof(struct seq_net_private));
2704 2705 2706 2707 2708 2709 2710
}

static const struct file_operations ptype_seq_fops = {
	.owner	 = THIS_MODULE,
	.open    = ptype_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
2711
	.release = seq_release_net,
2712 2713 2714
};


2715
static int __net_init dev_proc_net_init(struct net *net)
L
Linus Torvalds 已提交
2716 2717 2718
{
	int rc = -ENOMEM;

2719
	if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
L
Linus Torvalds 已提交
2720
		goto out;
2721
	if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
L
Linus Torvalds 已提交
2722
		goto out_dev;
2723
	if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
2724
		goto out_softnet;
2725

2726
	if (wext_proc_init(net))
2727
		goto out_ptype;
L
Linus Torvalds 已提交
2728 2729 2730
	rc = 0;
out:
	return rc;
2731
out_ptype:
2732
	proc_net_remove(net, "ptype");
L
Linus Torvalds 已提交
2733
out_softnet:
2734
	proc_net_remove(net, "softnet_stat");
L
Linus Torvalds 已提交
2735
out_dev:
2736
	proc_net_remove(net, "dev");
L
Linus Torvalds 已提交
2737 2738
	goto out;
}
2739

2740
static void __net_exit dev_proc_net_exit(struct net *net)
2741 2742 2743 2744 2745 2746 2747 2748
{
	wext_proc_exit(net);

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

2749
static struct pernet_operations __net_initdata dev_proc_ops = {
2750 2751 2752 2753 2754 2755 2756 2757
	.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
2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786
#else
#define dev_proc_init() 0
#endif	/* CONFIG_PROC_FS */


/**
 *	netdev_set_master	-	set up master/slave pair
 *	@slave: slave device
 *	@master: new master device
 *
 *	Changes the master device of the slave. Pass %NULL to break the
 *	bonding. The caller must hold the RTNL semaphore. On a failure
 *	a negative errno code is returned. On success the reference counts
 *	are adjusted, %RTM_NEWLINK is sent to the routing socket and the
 *	function returns zero.
 */
int netdev_set_master(struct net_device *slave, struct net_device *master)
{
	struct net_device *old = slave->master;

	ASSERT_RTNL();

	if (master) {
		if (old)
			return -EBUSY;
		dev_hold(master);
	}

	slave->master = master;
2787

L
Linus Torvalds 已提交
2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801
	synchronize_net();

	if (old)
		dev_put(old);

	if (master)
		slave->flags |= IFF_SLAVE;
	else
		slave->flags &= ~IFF_SLAVE;

	rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
	return 0;
}

2802
static int __dev_set_promiscuity(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
2803 2804 2805
{
	unsigned short old_flags = dev->flags;

2806 2807
	ASSERT_RTNL();

2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824
	dev->flags |= IFF_PROMISC;
	dev->promiscuity += inc;
	if (dev->promiscuity == 0) {
		/*
		 * Avoid overflow.
		 * If inc causes overflow, untouch promisc and return error.
		 */
		if (inc < 0)
			dev->flags &= ~IFF_PROMISC;
		else {
			dev->promiscuity -= inc;
			printk(KERN_WARNING "%s: promiscuity touches roof, "
				"set promiscuity failed, promiscuity feature "
				"of device might be broken.\n", dev->name);
			return -EOVERFLOW;
		}
	}
2825
	if (dev->flags != old_flags) {
L
Linus Torvalds 已提交
2826 2827
		printk(KERN_INFO "device %s %s promiscuous mode\n",
		       dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2828
							       "left");
2829 2830 2831 2832 2833 2834 2835 2836 2837
		if (audit_enabled)
			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),
				current->uid, current->gid,
				audit_get_sessionid(current));
2838 2839 2840

		if (dev->change_rx_flags)
			dev->change_rx_flags(dev, IFF_PROMISC);
L
Linus Torvalds 已提交
2841
	}
2842
	return 0;
L
Linus Torvalds 已提交
2843 2844
}

2845 2846 2847 2848 2849 2850 2851 2852 2853
/**
 *	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.
2854
 *	Return 0 if successful or a negative errno code on error.
2855
 */
2856
int dev_set_promiscuity(struct net_device *dev, int inc)
2857 2858
{
	unsigned short old_flags = dev->flags;
2859
	int err;
2860

2861
	err = __dev_set_promiscuity(dev, inc);
2862
	if (err < 0)
2863
		return err;
2864 2865
	if (dev->flags != old_flags)
		dev_set_rx_mode(dev);
2866
	return err;
2867 2868
}

L
Linus Torvalds 已提交
2869 2870 2871 2872 2873 2874 2875 2876 2877 2878
/**
 *	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.
2879
 *	Return 0 if successful or a negative errno code on error.
L
Linus Torvalds 已提交
2880 2881
 */

2882
int dev_set_allmulti(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
2883 2884 2885
{
	unsigned short old_flags = dev->flags;

2886 2887
	ASSERT_RTNL();

L
Linus Torvalds 已提交
2888
	dev->flags |= IFF_ALLMULTI;
2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904
	dev->allmulti += inc;
	if (dev->allmulti == 0) {
		/*
		 * Avoid overflow.
		 * If inc causes overflow, untouch allmulti and return error.
		 */
		if (inc < 0)
			dev->flags &= ~IFF_ALLMULTI;
		else {
			dev->allmulti -= inc;
			printk(KERN_WARNING "%s: allmulti touches roof, "
				"set allmulti failed, allmulti feature of "
				"device might be broken.\n", dev->name);
			return -EOVERFLOW;
		}
	}
2905 2906 2907
	if (dev->flags ^ old_flags) {
		if (dev->change_rx_flags)
			dev->change_rx_flags(dev, IFF_ALLMULTI);
2908
		dev_set_rx_mode(dev);
2909
	}
2910
	return 0;
2911 2912 2913 2914 2915
}

/*
 *	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
2916
 *	filtering it is put in promiscuous mode while unicast addresses
2917 2918 2919 2920 2921 2922 2923 2924 2925
 *	are present.
 */
void __dev_set_rx_mode(struct net_device *dev)
{
	/* dev_open will call this function so the list will stay sane. */
	if (!(dev->flags&IFF_UP))
		return;

	if (!netif_device_present(dev))
2926
		return;
2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951

	if (dev->set_rx_mode)
		dev->set_rx_mode(dev);
	else {
		/* Unicast addresses changes may only happen under the rtnl,
		 * therefore calling __dev_set_promiscuity here is safe.
		 */
		if (dev->uc_count > 0 && !dev->uc_promisc) {
			__dev_set_promiscuity(dev, 1);
			dev->uc_promisc = 1;
		} else if (dev->uc_count == 0 && dev->uc_promisc) {
			__dev_set_promiscuity(dev, -1);
			dev->uc_promisc = 0;
		}

		if (dev->set_multicast_list)
			dev->set_multicast_list(dev);
	}
}

void dev_set_rx_mode(struct net_device *dev)
{
	netif_tx_lock_bh(dev);
	__dev_set_rx_mode(dev);
	netif_tx_unlock_bh(dev);
L
Linus Torvalds 已提交
2952 2953
}

2954 2955
int __dev_addr_delete(struct dev_addr_list **list, int *count,
		      void *addr, int alen, int glbl)
2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972
{
	struct dev_addr_list *da;

	for (; (da = *list) != NULL; list = &da->next) {
		if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
		    alen == da->da_addrlen) {
			if (glbl) {
				int old_glbl = da->da_gusers;
				da->da_gusers = 0;
				if (old_glbl == 0)
					break;
			}
			if (--da->da_users)
				return 0;

			*list = da->next;
			kfree(da);
2973
			(*count)--;
2974 2975 2976 2977 2978 2979
			return 0;
		}
	}
	return -ENOENT;
}

2980 2981
int __dev_addr_add(struct dev_addr_list **list, int *count,
		   void *addr, int alen, int glbl)
2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998
{
	struct dev_addr_list *da;

	for (da = *list; da != NULL; da = da->next) {
		if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
		    da->da_addrlen == alen) {
			if (glbl) {
				int old_glbl = da->da_gusers;
				da->da_gusers = 1;
				if (old_glbl)
					return 0;
			}
			da->da_users++;
			return 0;
		}
	}

2999
	da = kzalloc(sizeof(*da), GFP_ATOMIC);
3000 3001 3002 3003 3004 3005 3006 3007
	if (da == NULL)
		return -ENOMEM;
	memcpy(da->da_addr, addr, alen);
	da->da_addrlen = alen;
	da->da_users = 1;
	da->da_gusers = glbl ? 1 : 0;
	da->next = *list;
	*list = da;
3008
	(*count)++;
3009 3010 3011
	return 0;
}

3012 3013 3014
/**
 *	dev_unicast_delete	- Release secondary unicast address.
 *	@dev: device
R
Randy Dunlap 已提交
3015 3016
 *	@addr: address to delete
 *	@alen: length of @addr
3017 3018
 *
 *	Release reference to a secondary unicast address and remove it
R
Randy Dunlap 已提交
3019
 *	from the device if the reference count drops to zero.
3020 3021 3022 3023 3024 3025 3026 3027 3028 3029
 *
 * 	The caller must hold the rtnl_mutex.
 */
int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
{
	int err;

	ASSERT_RTNL();

	netif_tx_lock_bh(dev);
3030 3031
	err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
	if (!err)
3032 3033 3034 3035 3036 3037 3038 3039 3040
		__dev_set_rx_mode(dev);
	netif_tx_unlock_bh(dev);
	return err;
}
EXPORT_SYMBOL(dev_unicast_delete);

/**
 *	dev_unicast_add		- add a secondary unicast address
 *	@dev: device
3041
 *	@addr: address to add
R
Randy Dunlap 已提交
3042
 *	@alen: length of @addr
3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055
 *
 *	Add a secondary unicast address to the device or increase
 *	the reference count if it already exists.
 *
 *	The caller must hold the rtnl_mutex.
 */
int dev_unicast_add(struct net_device *dev, void *addr, int alen)
{
	int err;

	ASSERT_RTNL();

	netif_tx_lock_bh(dev);
3056 3057
	err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
	if (!err)
3058 3059 3060 3061 3062 3063
		__dev_set_rx_mode(dev);
	netif_tx_unlock_bh(dev);
	return err;
}
EXPORT_SYMBOL(dev_unicast_add);

3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136
int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
		    struct dev_addr_list **from, int *from_count)
{
	struct dev_addr_list *da, *next;
	int err = 0;

	da = *from;
	while (da != NULL) {
		next = da->next;
		if (!da->da_synced) {
			err = __dev_addr_add(to, to_count,
					     da->da_addr, da->da_addrlen, 0);
			if (err < 0)
				break;
			da->da_synced = 1;
			da->da_users++;
		} else if (da->da_users == 1) {
			__dev_addr_delete(to, to_count,
					  da->da_addr, da->da_addrlen, 0);
			__dev_addr_delete(from, from_count,
					  da->da_addr, da->da_addrlen, 0);
		}
		da = next;
	}
	return err;
}

void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
		       struct dev_addr_list **from, int *from_count)
{
	struct dev_addr_list *da, *next;

	da = *from;
	while (da != NULL) {
		next = da->next;
		if (da->da_synced) {
			__dev_addr_delete(to, to_count,
					  da->da_addr, da->da_addrlen, 0);
			da->da_synced = 0;
			__dev_addr_delete(from, from_count,
					  da->da_addr, da->da_addrlen, 0);
		}
		da = next;
	}
}

/**
 *	dev_unicast_sync - Synchronize device's unicast list to another device
 *	@to: destination device
 *	@from: source device
 *
 *	Add newly added addresses to the destination device and release
 *	addresses that have no users left. The source device must be
 *	locked by netif_tx_lock_bh.
 *
 *	This function is intended to be called from the dev->set_rx_mode
 *	function of layered software devices.
 */
int dev_unicast_sync(struct net_device *to, struct net_device *from)
{
	int err = 0;

	netif_tx_lock_bh(to);
	err = __dev_addr_sync(&to->uc_list, &to->uc_count,
			      &from->uc_list, &from->uc_count);
	if (!err)
		__dev_set_rx_mode(to);
	netif_tx_unlock_bh(to);
	return err;
}
EXPORT_SYMBOL(dev_unicast_sync);

/**
3137
 *	dev_unicast_unsync - Remove synchronized addresses from the destination device
3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158
 *	@to: destination device
 *	@from: source device
 *
 *	Remove all addresses that were added to the destination device by
 *	dev_unicast_sync(). This function is intended to be called from the
 *	dev->stop function of layered software devices.
 */
void dev_unicast_unsync(struct net_device *to, struct net_device *from)
{
	netif_tx_lock_bh(from);
	netif_tx_lock_bh(to);

	__dev_addr_unsync(&to->uc_list, &to->uc_count,
			  &from->uc_list, &from->uc_count);
	__dev_set_rx_mode(to);

	netif_tx_unlock_bh(to);
	netif_tx_unlock_bh(from);
}
EXPORT_SYMBOL(dev_unicast_unsync);

3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172
static void __dev_addr_discard(struct dev_addr_list **list)
{
	struct dev_addr_list *tmp;

	while (*list != NULL) {
		tmp = *list;
		*list = tmp->next;
		if (tmp->da_users > tmp->da_gusers)
			printk("__dev_addr_discard: address leakage! "
			       "da_users=%d\n", tmp->da_users);
		kfree(tmp);
	}
}

3173
static void dev_addr_discard(struct net_device *dev)
3174 3175
{
	netif_tx_lock_bh(dev);
3176

3177 3178 3179
	__dev_addr_discard(&dev->uc_list);
	dev->uc_count = 0;

3180 3181
	__dev_addr_discard(&dev->mc_list);
	dev->mc_count = 0;
3182

3183 3184 3185
	netif_tx_unlock_bh(dev);
}

L
Linus Torvalds 已提交
3186 3187 3188 3189 3190 3191
unsigned dev_get_flags(const struct net_device *dev)
{
	unsigned flags;

	flags = (dev->flags & ~(IFF_PROMISC |
				IFF_ALLMULTI |
S
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3192 3193 3194
				IFF_RUNNING |
				IFF_LOWER_UP |
				IFF_DORMANT)) |
L
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3195 3196 3197
		(dev->gflags & (IFF_PROMISC |
				IFF_ALLMULTI));

S
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3198 3199 3200 3201 3202 3203 3204 3205
	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;
	}
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3206 3207 3208 3209 3210 3211

	return flags;
}

int dev_change_flags(struct net_device *dev, unsigned flags)
{
3212
	int ret, changes;
L
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3213 3214
	int old_flags = dev->flags;

3215 3216
	ASSERT_RTNL();

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3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230
	/*
	 *	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.
	 */

3231
	if (dev->change_rx_flags && (old_flags ^ flags) & IFF_MULTICAST)
3232 3233
		dev->change_rx_flags(dev, IFF_MULTICAST);

3234
	dev_set_rx_mode(dev);
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3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246

	/*
	 *	Have we downed the interface. We handle IFF_UP ourselves
	 *	according to user attempts to set it, rather than blindly
	 *	setting it.
	 */

	ret = 0;
	if ((old_flags ^ flags) & IFF_UP) {	/* Bit is different  ? */
		ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);

		if (!ret)
3247
			dev_set_rx_mode(dev);
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3248 3249 3250 3251 3252
	}

	if (dev->flags & IFF_UP &&
	    ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
					  IFF_VOLATILE)))
3253
		call_netdevice_notifiers(NETDEV_CHANGE, dev);
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3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270

	if ((flags ^ dev->gflags) & IFF_PROMISC) {
		int inc = (flags & IFF_PROMISC) ? +1 : -1;
		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) {
		int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
		dev->gflags ^= IFF_ALLMULTI;
		dev_set_allmulti(dev, inc);
	}

3271 3272 3273 3274
	/* Exclude state transition flags, already notified */
	changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
	if (changes)
		rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
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3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298

	return ret;
}

int dev_set_mtu(struct net_device *dev, int new_mtu)
{
	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;
	if (dev->change_mtu)
		err = dev->change_mtu(dev, new_mtu);
	else
		dev->mtu = new_mtu;
	if (!err && dev->flags & IFF_UP)
3299
		call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
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3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314
	return err;
}

int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
{
	int err;

	if (!dev->set_mac_address)
		return -EOPNOTSUPP;
	if (sa->sa_family != dev->type)
		return -EINVAL;
	if (!netif_device_present(dev))
		return -ENODEV;
	err = dev->set_mac_address(dev, sa);
	if (!err)
3315
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
L
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3316 3317 3318 3319
	return err;
}

/*
3320
 *	Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
L
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3321
 */
3322
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
L
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3323 3324
{
	int err;
3325
	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
L
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3326 3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352

	if (!dev)
		return -ENODEV;

	switch (cmd) {
		case SIOCGIFFLAGS:	/* Get interface flags */
			ifr->ifr_flags = dev_get_flags(dev);
			return 0;

		case SIOCGIFMETRIC:	/* Get the metric on the interface
					   (currently unused) */
			ifr->ifr_metric = 0;
			return 0;

		case SIOCGIFMTU:	/* Get the MTU of a device */
			ifr->ifr_mtu = dev->mtu;
			return 0;

		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;

3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407
		case SIOCGIFSLAVE:
			err = -EINVAL;
			break;

		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;

		case SIOCGIFINDEX:
			ifr->ifr_ifindex = dev->ifindex;
			return 0;

		case SIOCGIFTXQLEN:
			ifr->ifr_qlen = dev->tx_queue_len;
			return 0;

		default:
			/* dev_ioctl() should ensure this case
			 * is never reached
			 */
			WARN_ON(1);
			err = -EINVAL;
			break;

	}
	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);

	if (!dev)
		return -ENODEV;

	switch (cmd) {
		case SIOCSIFFLAGS:	/* Set interface flags */
			return dev_change_flags(dev, ifr->ifr_flags);

		case SIOCSIFMETRIC:	/* Set the metric on the interface
					   (currently unused) */
			return -EOPNOTSUPP;

		case SIOCSIFMTU:	/* Set the MTU of a device */
			return dev_set_mtu(dev, ifr->ifr_mtu);

L
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3408 3409 3410 3411 3412 3413 3414 3415
		case SIOCSIFHWADDR:
			return dev_set_mac_address(dev, &ifr->ifr_hwaddr);

		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));
3416
			call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
L
Linus Torvalds 已提交
3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427
			return 0;

		case SIOCSIFMAP:
			if (dev->set_config) {
				if (!netif_device_present(dev))
					return -ENODEV;
				return dev->set_config(dev, &ifr->ifr_map);
			}
			return -EOPNOTSUPP;

		case SIOCADDMULTI:
3428
			if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
L
Linus Torvalds 已提交
3429 3430 3431 3432 3433 3434 3435 3436
			    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
				return -EINVAL;
			if (!netif_device_present(dev))
				return -ENODEV;
			return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
					  dev->addr_len, 1);

		case SIOCDELMULTI:
3437
			if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
L
Linus Torvalds 已提交
3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491 3492 3493 3494 3495
			    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
				return -EINVAL;
			if (!netif_device_present(dev))
				return -ENODEV;
			return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
					     dev->addr_len, 1);

		case SIOCSIFTXQLEN:
			if (ifr->ifr_qlen < 0)
				return -EINVAL;
			dev->tx_queue_len = ifr->ifr_qlen;
			return 0;

		case SIOCSIFNAME:
			ifr->ifr_newname[IFNAMSIZ-1] = '\0';
			return dev_change_name(dev, ifr->ifr_newname);

		/*
		 *	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 == SIOCWANDEV) {
				err = -EOPNOTSUPP;
				if (dev->do_ioctl) {
					if (netif_device_present(dev))
						err = dev->do_ioctl(dev, ifr,
								    cmd);
					else
						err = -ENODEV;
				}
			} else
				err = -EINVAL;

	}
	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
3496
 *	@net: the applicable net namespace
L
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3497 3498 3499 3500 3501 3502 3503 3504 3505
 *	@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.
 */

3506
int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
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Linus Torvalds 已提交
3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517
{
	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) {
3518
		rtnl_lock();
3519
		ret = dev_ifconf(net, (char __user *) arg);
3520
		rtnl_unlock();
L
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3521 3522 3523
		return ret;
	}
	if (cmd == SIOCGIFNAME)
3524
		return dev_ifname(net, (struct ifreq __user *)arg);
L
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3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553

	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) {
		/*
		 *	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:
3554
			dev_load(net, ifr.ifr_name);
L
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3555
			read_lock(&dev_base_lock);
3556
			ret = dev_ifsioc_locked(net, &ifr, cmd);
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3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567
			read_unlock(&dev_base_lock);
			if (!ret) {
				if (colon)
					*colon = ':';
				if (copy_to_user(arg, &ifr,
						 sizeof(struct ifreq)))
					ret = -EFAULT;
			}
			return ret;

		case SIOCETHTOOL:
3568
			dev_load(net, ifr.ifr_name);
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3569
			rtnl_lock();
3570
			ret = dev_ethtool(net, &ifr);
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3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591
			rtnl_unlock();
			if (!ret) {
				if (colon)
					*colon = ':';
				if (copy_to_user(arg, &ifr,
						 sizeof(struct ifreq)))
					ret = -EFAULT;
			}
			return ret;

		/*
		 *	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;
3592
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
3593
			rtnl_lock();
3594
			ret = dev_ifsioc(net, &ifr, cmd);
L
Linus Torvalds 已提交
3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629
			rtnl_unlock();
			if (!ret) {
				if (colon)
					*colon = ':';
				if (copy_to_user(arg, &ifr,
						 sizeof(struct ifreq)))
					ret = -EFAULT;
			}
			return ret;

		/*
		 *	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:
			if (!capable(CAP_NET_ADMIN))
				return -EPERM;
3630 3631 3632
			/* fall through */
		case SIOCBONDSLAVEINFOQUERY:
		case SIOCBONDINFOQUERY:
3633
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
3634
			rtnl_lock();
3635
			ret = dev_ifsioc(net, &ifr, cmd);
L
Linus Torvalds 已提交
3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654
			rtnl_unlock();
			return ret;

		case SIOCGIFMEM:
			/* Get the per device memory space. We can add this but
			 * currently do not support it */
		case SIOCSIFMEM:
			/* Set the per device memory buffer space.
			 * Not applicable in our case */
		case SIOCSIFLINK:
			return -EINVAL;

		/*
		 *	Unknown or private ioctl.
		 */
		default:
			if (cmd == SIOCWANDEV ||
			    (cmd >= SIOCDEVPRIVATE &&
			     cmd <= SIOCDEVPRIVATE + 15)) {
3655
				dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
3656
				rtnl_lock();
3657
				ret = dev_ifsioc(net, &ifr, cmd);
L
Linus Torvalds 已提交
3658 3659 3660 3661 3662 3663 3664
				rtnl_unlock();
				if (!ret && copy_to_user(arg, &ifr,
							 sizeof(struct ifreq)))
					ret = -EFAULT;
				return ret;
			}
			/* Take care of Wireless Extensions */
3665
			if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
3666
				return wext_handle_ioctl(net, &ifr, cmd, arg);
L
Linus Torvalds 已提交
3667 3668 3669 3670 3671 3672 3673
			return -EINVAL;
	}
}


/**
 *	dev_new_index	-	allocate an ifindex
3674
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
3675 3676 3677 3678 3679
 *
 *	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.
 */
3680
static int dev_new_index(struct net *net)
L
Linus Torvalds 已提交
3681 3682 3683 3684 3685
{
	static int ifindex;
	for (;;) {
		if (++ifindex <= 0)
			ifindex = 1;
3686
		if (!__dev_get_by_index(net, ifindex))
L
Linus Torvalds 已提交
3687 3688 3689 3690 3691 3692
			return ifindex;
	}
}

/* Delayed registration/unregisteration */
static DEFINE_SPINLOCK(net_todo_list_lock);
3693
static LIST_HEAD(net_todo_list);
L
Linus Torvalds 已提交
3694

3695
static void net_set_todo(struct net_device *dev)
L
Linus Torvalds 已提交
3696 3697 3698 3699 3700 3701
{
	spin_lock(&net_todo_list_lock);
	list_add_tail(&dev->todo_list, &net_todo_list);
	spin_unlock(&net_todo_list_lock);
}

3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755
static void rollback_registered(struct net_device *dev)
{
	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

	/* Some devices call without registering for initialization unwind. */
	if (dev->reg_state == NETREG_UNINITIALIZED) {
		printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
				  "was registered\n", dev->name, dev);

		WARN_ON(1);
		return;
	}

	BUG_ON(dev->reg_state != NETREG_REGISTERED);

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

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

	dev->reg_state = NETREG_UNREGISTERING;

	synchronize_net();

	/* Shutdown queueing discipline. */
	dev_shutdown(dev);


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

	/*
	 *	Flush the unicast and multicast chains
	 */
	dev_addr_discard(dev);

	if (dev->uninit)
		dev->uninit(dev);

	/* Notifier chain MUST detach us from master device. */
	BUG_TRAP(!dev->master);

	/* Remove entries from kobject tree */
	netdev_unregister_kobject(dev);

	synchronize_net();

	dev_put(dev);
}

L
Linus Torvalds 已提交
3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777
/**
 *	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)
{
	struct hlist_head *head;
	struct hlist_node *p;
	int ret;
3778
	struct net *net;
L
Linus Torvalds 已提交
3779 3780 3781 3782

	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

3783 3784
	might_sleep();

L
Linus Torvalds 已提交
3785 3786
	/* When net_device's are persistent, this will be fatal. */
	BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
3787 3788
	BUG_ON(!dev_net(dev));
	net = dev_net(dev);
L
Linus Torvalds 已提交
3789 3790

	spin_lock_init(&dev->queue_lock);
H
Herbert Xu 已提交
3791
	spin_lock_init(&dev->_xmit_lock);
3792
	netdev_set_lockdep_class(&dev->_xmit_lock, dev->type);
L
Linus Torvalds 已提交
3793 3794 3795 3796 3797 3798 3799 3800 3801 3802 3803
	dev->xmit_lock_owner = -1;
	spin_lock_init(&dev->ingress_lock);

	dev->iflink = -1;

	/* Init, if this function is available */
	if (dev->init) {
		ret = dev->init(dev);
		if (ret) {
			if (ret > 0)
				ret = -EIO;
3804
			goto out;
L
Linus Torvalds 已提交
3805 3806
		}
	}
3807

L
Linus Torvalds 已提交
3808 3809
	if (!dev_valid_name(dev->name)) {
		ret = -EINVAL;
3810
		goto err_uninit;
L
Linus Torvalds 已提交
3811 3812
	}

3813
	dev->ifindex = dev_new_index(net);
L
Linus Torvalds 已提交
3814 3815 3816 3817
	if (dev->iflink == -1)
		dev->iflink = dev->ifindex;

	/* Check for existence of name */
3818
	head = dev_name_hash(net, dev->name);
L
Linus Torvalds 已提交
3819 3820 3821 3822 3823
	hlist_for_each(p, head) {
		struct net_device *d
			= hlist_entry(p, struct net_device, name_hlist);
		if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
			ret = -EEXIST;
3824
			goto err_uninit;
L
Linus Torvalds 已提交
3825
		}
3826
	}
L
Linus Torvalds 已提交
3827

3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843
	/* Fix illegal checksum combinations */
	if ((dev->features & NETIF_F_HW_CSUM) &&
	    (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
		printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
		       dev->name);
		dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
	}

	if ((dev->features & NETIF_F_NO_CSUM) &&
	    (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
		printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
		       dev->name);
		dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
	}


L
Linus Torvalds 已提交
3844 3845
	/* Fix illegal SG+CSUM combinations. */
	if ((dev->features & NETIF_F_SG) &&
3846
	    !(dev->features & NETIF_F_ALL_CSUM)) {
3847
		printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
L
Linus Torvalds 已提交
3848 3849 3850 3851 3852 3853 3854
		       dev->name);
		dev->features &= ~NETIF_F_SG;
	}

	/* TSO requires that SG is present as well. */
	if ((dev->features & NETIF_F_TSO) &&
	    !(dev->features & NETIF_F_SG)) {
3855
		printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
L
Linus Torvalds 已提交
3856 3857 3858
		       dev->name);
		dev->features &= ~NETIF_F_TSO;
	}
3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872
	if (dev->features & NETIF_F_UFO) {
		if (!(dev->features & NETIF_F_HW_CSUM)) {
			printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
					"NETIF_F_HW_CSUM feature.\n",
							dev->name);
			dev->features &= ~NETIF_F_UFO;
		}
		if (!(dev->features & NETIF_F_SG)) {
			printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
					"NETIF_F_SG feature.\n",
					dev->name);
			dev->features &= ~NETIF_F_UFO;
		}
	}
L
Linus Torvalds 已提交
3873

3874
	netdev_initialize_kobject(dev);
3875
	ret = netdev_register_kobject(dev);
3876
	if (ret)
3877
		goto err_uninit;
3878 3879
	dev->reg_state = NETREG_REGISTERED;

L
Linus Torvalds 已提交
3880 3881 3882 3883 3884 3885 3886 3887 3888
	/*
	 *	Default initial state at registry is that the
	 *	device is present.
	 */

	set_bit(__LINK_STATE_PRESENT, &dev->state);

	dev_init_scheduler(dev);
	dev_hold(dev);
3889
	list_netdevice(dev);
L
Linus Torvalds 已提交
3890 3891

	/* Notify protocols, that a new device appeared. */
3892
	ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
3893
	ret = notifier_to_errno(ret);
3894 3895 3896 3897
	if (ret) {
		rollback_registered(dev);
		dev->reg_state = NETREG_UNREGISTERED;
	}
L
Linus Torvalds 已提交
3898 3899 3900

out:
	return ret;
3901 3902 3903 3904 3905

err_uninit:
	if (dev->uninit)
		dev->uninit(dev);
	goto out;
L
Linus Torvalds 已提交
3906 3907 3908 3909 3910 3911 3912 3913 3914 3915 3916
}

/**
 *	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.
 *
3917
 *	This is a wrapper around register_netdevice that takes the rtnl semaphore
L
Linus Torvalds 已提交
3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935
 *	and expands the device name if you passed a format string to
 *	alloc_netdev.
 */
int register_netdev(struct net_device *dev)
{
	int err;

	rtnl_lock();

	/*
	 * If the name is a format string the caller wants us to do a
	 * name allocation.
	 */
	if (strchr(dev->name, '%')) {
		err = dev_alloc_name(dev, dev->name);
		if (err < 0)
			goto out;
	}
3936

L
Linus Torvalds 已提交
3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952
	err = register_netdevice(dev);
out:
	rtnl_unlock();
	return err;
}
EXPORT_SYMBOL(register_netdev);

/*
 * netdev_wait_allrefs - wait until all references are gone.
 *
 * This is called when unregistering network devices.
 *
 * Any protocol or device that holds a reference should register
 * for netdevice notification, and cleanup and put back the
 * reference if they receive an UNREGISTER event.
 * We can get stuck here if buggy protocols don't correctly
3953
 * call dev_put.
L
Linus Torvalds 已提交
3954 3955 3956 3957 3958 3959 3960 3961
 */
static void netdev_wait_allrefs(struct net_device *dev)
{
	unsigned long rebroadcast_time, warning_time;

	rebroadcast_time = warning_time = jiffies;
	while (atomic_read(&dev->refcnt) != 0) {
		if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
3962
			rtnl_lock();
L
Linus Torvalds 已提交
3963 3964

			/* Rebroadcast unregister notification */
3965
			call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
L
Linus Torvalds 已提交
3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977

			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();
			}

3978
			__rtnl_unlock();
L
Linus Torvalds 已提交
3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010

			rebroadcast_time = jiffies;
		}

		msleep(250);

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

/* The sequence is:
 *
 *	rtnl_lock();
 *	...
 *	register_netdevice(x1);
 *	register_netdevice(x2);
 *	...
 *	unregister_netdevice(y1);
 *	unregister_netdevice(y2);
 *      ...
 *	rtnl_unlock();
 *	free_netdev(y1);
 *	free_netdev(y2);
 *
 * We are invoked by rtnl_unlock() after it drops the semaphore.
 * This allows us to deal with problems:
4011
 * 1) We can delete sysfs objects which invoke hotplug
L
Linus Torvalds 已提交
4012 4013 4014 4015
 *    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.
 */
A
Arjan van de Ven 已提交
4016
static DEFINE_MUTEX(net_todo_run_mutex);
L
Linus Torvalds 已提交
4017 4018
void netdev_run_todo(void)
{
4019
	struct list_head list;
L
Linus Torvalds 已提交
4020 4021

	/* Need to guard against multiple cpu's getting out of order. */
A
Arjan van de Ven 已提交
4022
	mutex_lock(&net_todo_run_mutex);
L
Linus Torvalds 已提交
4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033

	/* Not safe to do outside the semaphore.  We must not return
	 * until all unregister events invoked by the local processor
	 * have been completed (either by this todo run, or one on
	 * another cpu).
	 */
	if (list_empty(&net_todo_list))
		goto out;

	/* Snapshot list, allow later requests */
	spin_lock(&net_todo_list_lock);
4034
	list_replace_init(&net_todo_list, &list);
L
Linus Torvalds 已提交
4035
	spin_unlock(&net_todo_list_lock);
4036

L
Linus Torvalds 已提交
4037 4038 4039 4040 4041
	while (!list_empty(&list)) {
		struct net_device *dev
			= list_entry(list.next, struct net_device, todo_list);
		list_del(&dev->todo_list);

4042 4043 4044 4045 4046 4047
		if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
			printk(KERN_ERR "network todo '%s' but state %d\n",
			       dev->name, dev->reg_state);
			dump_stack();
			continue;
		}
L
Linus Torvalds 已提交
4048

4049
		dev->reg_state = NETREG_UNREGISTERED;
L
Linus Torvalds 已提交
4050

4051
		netdev_wait_allrefs(dev);
L
Linus Torvalds 已提交
4052

4053 4054 4055 4056 4057
		/* paranoia */
		BUG_ON(atomic_read(&dev->refcnt));
		BUG_TRAP(!dev->ip_ptr);
		BUG_TRAP(!dev->ip6_ptr);
		BUG_TRAP(!dev->dn_ptr);
L
Linus Torvalds 已提交
4058

4059 4060
		if (dev->destructor)
			dev->destructor(dev);
4061 4062 4063

		/* Free network device */
		kobject_put(&dev->dev.kobj);
L
Linus Torvalds 已提交
4064 4065 4066
	}

out:
A
Arjan van de Ven 已提交
4067
	mutex_unlock(&net_todo_run_mutex);
L
Linus Torvalds 已提交
4068 4069
}

4070
static struct net_device_stats *internal_stats(struct net_device *dev)
R
Rusty Russell 已提交
4071
{
4072
	return &dev->stats;
R
Rusty Russell 已提交
4073 4074
}

L
Linus Torvalds 已提交
4075
/**
4076
 *	alloc_netdev_mq - allocate network device
L
Linus Torvalds 已提交
4077 4078 4079
 *	@sizeof_priv:	size of private data to allocate space for
 *	@name:		device name format string
 *	@setup:		callback to initialize device
4080
 *	@queue_count:	the number of subqueues to allocate
L
Linus Torvalds 已提交
4081 4082
 *
 *	Allocates a struct net_device with private data area for driver use
4083 4084
 *	and performs basic initialization.  Also allocates subquue structs
 *	for each queue on the device at the end of the netdevice.
L
Linus Torvalds 已提交
4085
 */
4086 4087
struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
		void (*setup)(struct net_device *), unsigned int queue_count)
L
Linus Torvalds 已提交
4088 4089 4090 4091 4092
{
	void *p;
	struct net_device *dev;
	int alloc_size;

4093 4094
	BUG_ON(strlen(name) >= sizeof(dev->name));

4095 4096 4097 4098 4099 4100 4101 4102 4103
	alloc_size = sizeof(struct net_device) +
		     sizeof(struct net_device_subqueue) * (queue_count - 1);
	if (sizeof_priv) {
		/* ensure 32-byte alignment of private area */
		alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
		alloc_size += sizeof_priv;
	}
	/* ensure 32-byte alignment of whole construct */
	alloc_size += NETDEV_ALIGN_CONST;
L
Linus Torvalds 已提交
4104

4105
	p = kzalloc(alloc_size, GFP_KERNEL);
L
Linus Torvalds 已提交
4106
	if (!p) {
4107
		printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
L
Linus Torvalds 已提交
4108 4109 4110 4111 4112 4113
		return NULL;
	}

	dev = (struct net_device *)
		(((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
	dev->padded = (char *)dev - (char *)p;
4114
	dev_net_set(dev, &init_net);
L
Linus Torvalds 已提交
4115

4116 4117 4118 4119
	if (sizeof_priv) {
		dev->priv = ((char *)dev +
			     ((sizeof(struct net_device) +
			       (sizeof(struct net_device_subqueue) *
4120
				(queue_count - 1)) + NETDEV_ALIGN_CONST)
4121 4122 4123 4124
			      & ~NETDEV_ALIGN_CONST));
	}

	dev->egress_subqueue_count = queue_count;
4125
	dev->gso_max_size = GSO_MAX_SIZE;
L
Linus Torvalds 已提交
4126

4127
	dev->get_stats = internal_stats;
4128
	netpoll_netdev_init(dev);
L
Linus Torvalds 已提交
4129 4130 4131 4132
	setup(dev);
	strcpy(dev->name, name);
	return dev;
}
4133
EXPORT_SYMBOL(alloc_netdev_mq);
L
Linus Torvalds 已提交
4134 4135 4136 4137 4138

/**
 *	free_netdev - free network device
 *	@dev: device
 *
4139 4140
 *	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
4141 4142 4143 4144
 *	If this is the last reference then it will be freed.
 */
void free_netdev(struct net_device *dev)
{
4145 4146
	release_net(dev_net(dev));

S
Stephen Hemminger 已提交
4147
	/*  Compatibility with error handling in drivers */
L
Linus Torvalds 已提交
4148 4149 4150 4151 4152 4153 4154 4155
	if (dev->reg_state == NETREG_UNINITIALIZED) {
		kfree((char *)dev - dev->padded);
		return;
	}

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

4156 4157
	/* will free via device release */
	put_device(&dev->dev);
L
Linus Torvalds 已提交
4158
}
4159

L
Linus Torvalds 已提交
4160
/* Synchronize with packet receive processing. */
4161
void synchronize_net(void)
L
Linus Torvalds 已提交
4162 4163
{
	might_sleep();
4164
	synchronize_rcu();
L
Linus Torvalds 已提交
4165 4166 4167 4168 4169 4170 4171
}

/**
 *	unregister_netdevice - remove device from the kernel
 *	@dev: device
 *
 *	This function shuts down a device interface and removes it
4172
 *	from the kernel tables.
L
Linus Torvalds 已提交
4173 4174 4175 4176 4177
 *
 *	Callers must hold the rtnl semaphore.  You may want
 *	unregister_netdev() instead of this.
 */

4178
void unregister_netdevice(struct net_device *dev)
L
Linus Torvalds 已提交
4179
{
4180 4181
	ASSERT_RTNL();

4182
	rollback_registered(dev);
L
Linus Torvalds 已提交
4183 4184 4185 4186 4187 4188 4189 4190 4191
	/* Finish processing unregister after unlock */
	net_set_todo(dev);
}

/**
 *	unregister_netdev - remove device from the kernel
 *	@dev: device
 *
 *	This function shuts down a device interface and removes it
4192
 *	from the kernel tables.
L
Linus Torvalds 已提交
4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203 4204 4205 4206
 *
 *	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);

4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240
/**
 *	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)
{
	char buf[IFNAMSIZ];
	const char *destname;
	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;
4241
	if (net_eq(dev_net(dev), net))
4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269
		goto out;

	/* Pick the destination device name, and ensure
	 * we can use it in the destination network namespace.
	 */
	err = -EEXIST;
	destname = dev->name;
	if (__dev_get_by_name(net, destname)) {
		/* We get here if we can't use the current device name */
		if (!pat)
			goto out;
		if (!dev_valid_name(pat))
			goto out;
		if (strchr(pat, '%')) {
			if (__dev_alloc_name(net, pat, buf) < 0)
				goto out;
			destname = buf;
		} else
			destname = pat;
		if (__dev_get_by_name(net, destname))
			goto out;
	}

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

	/* If device is running close it first. */
4270
	dev_close(dev);
4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291

	/* And unlink it from device chain */
	err = -ENODEV;
	unlist_netdevice(dev);

	synchronize_net();

	/* Shutdown queueing discipline. */
	dev_shutdown(dev);

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

	/*
	 *	Flush the unicast and multicast chains
	 */
	dev_addr_discard(dev);

	/* Actually switch the network namespace */
4292
	dev_net_set(dev, net);
4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305

	/* Assign the new device name */
	if (destname != dev->name)
		strcpy(dev->name, destname);

	/* 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;
	}

4306
	/* Fixup kobjects */
4307 4308
	netdev_unregister_kobject(dev);
	err = netdev_register_kobject(dev);
4309
	WARN_ON(err);
4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322

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

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

	synchronize_net();
	err = 0;
out:
	return err;
}

L
Linus Torvalds 已提交
4323 4324 4325 4326 4327 4328 4329 4330 4331 4332
static int dev_cpu_callback(struct notifier_block *nfb,
			    unsigned long action,
			    void *ocpu)
{
	struct sk_buff **list_skb;
	struct net_device **list_net;
	struct sk_buff *skb;
	unsigned int cpu, oldcpu = (unsigned long)ocpu;
	struct softnet_data *sd, *oldsd;

4333
	if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
L
Linus Torvalds 已提交
4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366
		return NOTIFY_OK;

	local_irq_disable();
	cpu = smp_processor_id();
	sd = &per_cpu(softnet_data, cpu);
	oldsd = &per_cpu(softnet_data, oldcpu);

	/* Find end of our completion_queue. */
	list_skb = &sd->completion_queue;
	while (*list_skb)
		list_skb = &(*list_skb)->next;
	/* Append completion queue from offline CPU. */
	*list_skb = oldsd->completion_queue;
	oldsd->completion_queue = NULL;

	/* Find end of our output_queue. */
	list_net = &sd->output_queue;
	while (*list_net)
		list_net = &(*list_net)->next_sched;
	/* Append output queue from offline CPU. */
	*list_net = oldsd->output_queue;
	oldsd->output_queue = NULL;

	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	local_irq_enable();

	/* Process offline CPU's input_pkt_queue */
	while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
		netif_rx(skb);

	return NOTIFY_OK;
}

4367 4368
#ifdef CONFIG_NET_DMA
/**
R
Randy Dunlap 已提交
4369 4370 4371 4372 4373
 * net_dma_rebalance - try to maintain one DMA channel per CPU
 * @net_dma: DMA client and associated data (lock, channels, channel_mask)
 *
 * This is called when the number of channels allocated to the net_dma client
 * changes.  The net_dma client tries to have one DMA channel per CPU.
4374
 */
4375 4376

static void net_dma_rebalance(struct net_dma *net_dma)
4377
{
4378
	unsigned int cpu, i, n, chan_idx;
4379 4380
	struct dma_chan *chan;

4381
	if (cpus_empty(net_dma->channel_mask)) {
4382
		for_each_online_cpu(cpu)
A
Alexey Dobriyan 已提交
4383
			rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
4384 4385 4386 4387 4388 4389
		return;
	}

	i = 0;
	cpu = first_cpu(cpu_online_map);

4390 4391 4392 4393 4394 4395
	for_each_cpu_mask(chan_idx, net_dma->channel_mask) {
		chan = net_dma->channels[chan_idx];

		n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask))
		   + (i < (num_online_cpus() %
			cpus_weight(net_dma->channel_mask)) ? 1 : 0));
4396 4397

		while(n) {
A
Alexey Dobriyan 已提交
4398
			per_cpu(softnet_data, cpu).net_dma = chan;
4399 4400 4401 4402 4403 4404 4405 4406 4407 4408
			cpu = next_cpu(cpu, cpu_online_map);
			n--;
		}
		i++;
	}
}

/**
 * netdev_dma_event - event callback for the net_dma_client
 * @client: should always be net_dma_client
R
Randy Dunlap 已提交
4409
 * @chan: DMA channel for the event
R
Randy Dunlap 已提交
4410
 * @state: DMA state to be handled
4411
 */
4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423
static enum dma_state_client
netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
	enum dma_state state)
{
	int i, found = 0, pos = -1;
	struct net_dma *net_dma =
		container_of(client, struct net_dma, client);
	enum dma_state_client ack = DMA_DUP; /* default: take no action */

	spin_lock(&net_dma->lock);
	switch (state) {
	case DMA_RESOURCE_AVAILABLE:
4424
		for (i = 0; i < nr_cpu_ids; i++)
4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436
			if (net_dma->channels[i] == chan) {
				found = 1;
				break;
			} else if (net_dma->channels[i] == NULL && pos < 0)
				pos = i;

		if (!found && pos >= 0) {
			ack = DMA_ACK;
			net_dma->channels[pos] = chan;
			cpu_set(pos, net_dma->channel_mask);
			net_dma_rebalance(net_dma);
		}
4437 4438
		break;
	case DMA_RESOURCE_REMOVED:
4439
		for (i = 0; i < nr_cpu_ids; i++)
4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451
			if (net_dma->channels[i] == chan) {
				found = 1;
				pos = i;
				break;
			}

		if (found) {
			ack = DMA_ACK;
			cpu_clear(pos, net_dma->channel_mask);
			net_dma->channels[i] = NULL;
			net_dma_rebalance(net_dma);
		}
4452 4453 4454 4455
		break;
	default:
		break;
	}
4456 4457 4458
	spin_unlock(&net_dma->lock);

	return ack;
4459 4460 4461 4462 4463 4464 4465
}

/**
 * netdev_dma_regiser - register the networking subsystem as a DMA client
 */
static int __init netdev_dma_register(void)
{
4466 4467 4468 4469 4470 4471 4472
	net_dma.channels = kzalloc(nr_cpu_ids * sizeof(struct net_dma),
								GFP_KERNEL);
	if (unlikely(!net_dma.channels)) {
		printk(KERN_NOTICE
				"netdev_dma: no memory for net_dma.channels\n");
		return -ENOMEM;
	}
4473 4474 4475 4476
	spin_lock_init(&net_dma.lock);
	dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask);
	dma_async_client_register(&net_dma.client);
	dma_async_client_chan_request(&net_dma.client);
4477 4478 4479 4480 4481 4482
	return 0;
}

#else
static int __init netdev_dma_register(void) { return -ENODEV; }
#endif /* CONFIG_NET_DMA */
L
Linus Torvalds 已提交
4483

4484 4485 4486 4487 4488 4489 4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522
/**
 *	netdev_compute_feature - compute conjunction of two feature sets
 *	@all: first feature set
 *	@one: second feature set
 *
 *	Computes a new feature set after adding a device with feature set
 *	@one to the master device with current feature set @all.  Returns
 *	the new feature set.
 */
int netdev_compute_features(unsigned long all, unsigned long one)
{
	/* if device needs checksumming, downgrade to hw checksumming */
	if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
		all ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;

	/* if device can't do all checksum, downgrade to ipv4/ipv6 */
	if (all & NETIF_F_HW_CSUM && !(one & NETIF_F_HW_CSUM))
		all ^= NETIF_F_HW_CSUM
			| NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;

	if (one & NETIF_F_GSO)
		one |= NETIF_F_GSO_SOFTWARE;
	one |= NETIF_F_GSO;

	/* If even one device supports robust GSO, enable it for all. */
	if (one & NETIF_F_GSO_ROBUST)
		all |= NETIF_F_GSO_ROBUST;

	all &= one | NETIF_F_LLTX;

	if (!(all & NETIF_F_ALL_CSUM))
		all &= ~NETIF_F_SG;
	if (!(all & NETIF_F_SG))
		all &= ~NETIF_F_GSO_MASK;

	return all;
}
EXPORT_SYMBOL(netdev_compute_features);

4523 4524 4525 4526 4527 4528 4529 4530 4531 4532 4533 4534 4535
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;
}

4536
/* Initialize per network namespace state */
4537
static int __net_init netdev_init(struct net *net)
4538 4539 4540
{
	INIT_LIST_HEAD(&net->dev_base_head);

4541 4542 4543
	net->dev_name_head = netdev_create_hash();
	if (net->dev_name_head == NULL)
		goto err_name;
4544

4545 4546 4547
	net->dev_index_head = netdev_create_hash();
	if (net->dev_index_head == NULL)
		goto err_idx;
4548 4549

	return 0;
4550 4551 4552 4553 4554

err_idx:
	kfree(net->dev_name_head);
err_name:
	return -ENOMEM;
4555 4556
}

4557
static void __net_exit netdev_exit(struct net *net)
4558 4559 4560 4561 4562
{
	kfree(net->dev_name_head);
	kfree(net->dev_index_head);
}

4563
static struct pernet_operations __net_initdata netdev_net_ops = {
4564 4565 4566 4567
	.init = netdev_init,
	.exit = netdev_exit,
};

4568
static void __net_exit default_device_exit(struct net *net)
4569 4570 4571 4572 4573 4574 4575 4576 4577
{
	struct net_device *dev, *next;
	/*
	 * Push all migratable of the network devices back to the
	 * initial network namespace
	 */
	rtnl_lock();
	for_each_netdev_safe(net, dev, next) {
		int err;
4578
		char fb_name[IFNAMSIZ];
4579 4580 4581 4582 4583 4584

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

		/* Push remaing network devices to init_net */
4585 4586
		snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
		err = dev_change_net_namespace(dev, &init_net, fb_name);
4587
		if (err) {
4588
			printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
4589
				__func__, dev->name, err);
4590
			BUG();
4591 4592 4593 4594 4595
		}
	}
	rtnl_unlock();
}

4596
static struct pernet_operations __net_initdata default_device_ops = {
4597 4598 4599
	.exit = default_device_exit,
};

L
Linus Torvalds 已提交
4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619
/*
 *	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;

4620
	if (netdev_kobject_init())
L
Linus Torvalds 已提交
4621 4622 4623
		goto out;

	INIT_LIST_HEAD(&ptype_all);
4624
	for (i = 0; i < PTYPE_HASH_SIZE; i++)
L
Linus Torvalds 已提交
4625 4626
		INIT_LIST_HEAD(&ptype_base[i]);

4627 4628
	if (register_pernet_subsys(&netdev_net_ops))
		goto out;
L
Linus Torvalds 已提交
4629

4630 4631 4632
	if (register_pernet_device(&default_device_ops))
		goto out;

L
Linus Torvalds 已提交
4633 4634 4635 4636
	/*
	 *	Initialise the packet receive queues.
	 */

4637
	for_each_possible_cpu(i) {
L
Linus Torvalds 已提交
4638 4639 4640 4641 4642 4643
		struct softnet_data *queue;

		queue = &per_cpu(softnet_data, i);
		skb_queue_head_init(&queue->input_pkt_queue);
		queue->completion_queue = NULL;
		INIT_LIST_HEAD(&queue->poll_list);
4644 4645 4646

		queue->backlog.poll = process_backlog;
		queue->backlog.weight = weight_p;
L
Linus Torvalds 已提交
4647 4648
	}

4649 4650
	netdev_dma_register();

L
Linus Torvalds 已提交
4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661 4662 4663 4664 4665 4666 4667 4668
	dev_boot_phase = 0;

	open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
	open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);

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

subsys_initcall(net_dev_init);

EXPORT_SYMBOL(__dev_get_by_index);
EXPORT_SYMBOL(__dev_get_by_name);
EXPORT_SYMBOL(__dev_remove_pack);
4669
EXPORT_SYMBOL(dev_valid_name);
L
Linus Torvalds 已提交
4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703 4704 4705 4706 4707 4708 4709 4710 4711
EXPORT_SYMBOL(dev_add_pack);
EXPORT_SYMBOL(dev_alloc_name);
EXPORT_SYMBOL(dev_close);
EXPORT_SYMBOL(dev_get_by_flags);
EXPORT_SYMBOL(dev_get_by_index);
EXPORT_SYMBOL(dev_get_by_name);
EXPORT_SYMBOL(dev_open);
EXPORT_SYMBOL(dev_queue_xmit);
EXPORT_SYMBOL(dev_remove_pack);
EXPORT_SYMBOL(dev_set_allmulti);
EXPORT_SYMBOL(dev_set_promiscuity);
EXPORT_SYMBOL(dev_change_flags);
EXPORT_SYMBOL(dev_set_mtu);
EXPORT_SYMBOL(dev_set_mac_address);
EXPORT_SYMBOL(free_netdev);
EXPORT_SYMBOL(netdev_boot_setup_check);
EXPORT_SYMBOL(netdev_set_master);
EXPORT_SYMBOL(netdev_state_change);
EXPORT_SYMBOL(netif_receive_skb);
EXPORT_SYMBOL(netif_rx);
EXPORT_SYMBOL(register_gifconf);
EXPORT_SYMBOL(register_netdevice);
EXPORT_SYMBOL(register_netdevice_notifier);
EXPORT_SYMBOL(skb_checksum_help);
EXPORT_SYMBOL(synchronize_net);
EXPORT_SYMBOL(unregister_netdevice);
EXPORT_SYMBOL(unregister_netdevice_notifier);
EXPORT_SYMBOL(net_enable_timestamp);
EXPORT_SYMBOL(net_disable_timestamp);
EXPORT_SYMBOL(dev_get_flags);

#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
EXPORT_SYMBOL(br_handle_frame_hook);
EXPORT_SYMBOL(br_fdb_get_hook);
EXPORT_SYMBOL(br_fdb_put_hook);
#endif

#ifdef CONFIG_KMOD
EXPORT_SYMBOL(dev_load);
#endif

EXPORT_PER_CPU_SYMBOL(softnet_data);