dev.c 142.7 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9
/*
 * 	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
10
 * 		Authors:	Ross Biro
L
Linus Torvalds 已提交
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77
 *				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>
78
#include <linux/capability.h>
L
Linus Torvalds 已提交
79 80 81
#include <linux/cpu.h>
#include <linux/types.h>
#include <linux/kernel.h>
82
#include <linux/hash.h>
83
#include <linux/slab.h>
L
Linus Torvalds 已提交
84
#include <linux/sched.h>
A
Arjan van de Ven 已提交
85
#include <linux/mutex.h>
L
Linus Torvalds 已提交
86 87 88 89 90 91 92 93 94
#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>
95
#include <linux/ethtool.h>
L
Linus Torvalds 已提交
96 97
#include <linux/notifier.h>
#include <linux/skbuff.h>
98
#include <net/net_namespace.h>
L
Linus Torvalds 已提交
99 100 101 102 103 104
#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>
P
Patrick McHardy 已提交
105
#include <linux/if_macvlan.h>
L
Linus Torvalds 已提交
106 107 108
#include <net/dst.h>
#include <net/pkt_sched.h>
#include <net/checksum.h>
109
#include <net/xfrm.h>
L
Linus Torvalds 已提交
110 111 112 113 114 115 116
#include <linux/highmem.h>
#include <linux/init.h>
#include <linux/kmod.h>
#include <linux/module.h>
#include <linux/netpoll.h>
#include <linux/rcupdate.h>
#include <linux/delay.h>
117
#include <net/wext.h>
L
Linus Torvalds 已提交
118 119
#include <net/iw_handler.h>
#include <asm/current.h>
S
Steve Grubb 已提交
120
#include <linux/audit.h>
121
#include <linux/dmaengine.h>
122
#include <linux/err.h>
123
#include <linux/ctype.h>
124
#include <linux/if_arp.h>
125
#include <linux/if_vlan.h>
126
#include <linux/ip.h>
127
#include <net/ip.h>
128 129
#include <linux/ipv6.h>
#include <linux/in.h>
D
David S. Miller 已提交
130 131
#include <linux/jhash.h>
#include <linux/random.h>
132
#include <trace/events/napi.h>
133
#include <linux/pci.h>
L
Linus Torvalds 已提交
134

135 136
#include "net-sysfs.h"

137 138 139
/* Instead of increasing this, you should create a hash table. */
#define MAX_GRO_SKBS 8

H
Herbert Xu 已提交
140 141 142
/* This should be increased if a protocol with a bigger head is added. */
#define GRO_MAX_HEAD (MAX_HEADER + 128)

L
Linus Torvalds 已提交
143 144 145 146 147 148 149 150 151 152 153
/*
 *	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
S
Stephen Hemminger 已提交
154
 *             the average user (w/out VLANs) will not be adversely affected.
L
Linus Torvalds 已提交
155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170
 *             --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
 */

171 172 173
#define PTYPE_HASH_SIZE	(16)
#define PTYPE_HASH_MASK	(PTYPE_HASH_SIZE - 1)

L
Linus Torvalds 已提交
174
static DEFINE_SPINLOCK(ptype_lock);
175
static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
176
static struct list_head ptype_all __read_mostly;	/* Taps */
L
Linus Torvalds 已提交
177 178

/*
179
 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
L
Linus Torvalds 已提交
180 181
 * semaphore.
 *
182
 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
L
Linus Torvalds 已提交
183 184
 *
 * Writers must hold the rtnl semaphore while they loop through the
185
 * dev_base_head list, and hold dev_base_lock for writing when they do the
L
Linus Torvalds 已提交
186 187 188 189 190 191 192 193 194 195 196 197 198 199
 * 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);

200
static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
L
Linus Torvalds 已提交
201 202
{
	unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
203
	return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
L
Linus Torvalds 已提交
204 205
}

206
static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
L
Linus Torvalds 已提交
207
{
208
	return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
L
Linus Torvalds 已提交
209 210
}

E
Eric Dumazet 已提交
211
static inline void rps_lock(struct softnet_data *sd)
212 213
{
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
214
	spin_lock(&sd->input_pkt_queue.lock);
215 216 217
#endif
}

E
Eric Dumazet 已提交
218
static inline void rps_unlock(struct softnet_data *sd)
219 220
{
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
221
	spin_unlock(&sd->input_pkt_queue.lock);
222 223 224
#endif
}

225 226 227
/* Device list insertion */
static int list_netdevice(struct net_device *dev)
{
228
	struct net *net = dev_net(dev);
229 230 231 232

	ASSERT_RTNL();

	write_lock_bh(&dev_base_lock);
233
	list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
234
	hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
235 236
	hlist_add_head_rcu(&dev->index_hlist,
			   dev_index_hash(net, dev->ifindex));
237 238 239 240
	write_unlock_bh(&dev_base_lock);
	return 0;
}

241 242 243
/* Device list removal
 * caller must respect a RCU grace period before freeing/reusing dev
 */
244 245 246 247 248 249
static void unlist_netdevice(struct net_device *dev)
{
	ASSERT_RTNL();

	/* Unlink dev from the device chain */
	write_lock_bh(&dev_base_lock);
250
	list_del_rcu(&dev->dev_list);
251
	hlist_del_rcu(&dev->name_hlist);
252
	hlist_del_rcu(&dev->index_hlist);
253 254 255
	write_unlock_bh(&dev_base_lock);
}

L
Linus Torvalds 已提交
256 257 258 259
/*
 *	Our notifier list
 */

260
static RAW_NOTIFIER_HEAD(netdev_chain);
L
Linus Torvalds 已提交
261 262 263 264 265

/*
 *	Device drivers call our routines to queue packets here. We empty the
 *	queue in the local softnet handler.
 */
266

267
DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
E
Eric Dumazet 已提交
268
EXPORT_PER_CPU_SYMBOL(softnet_data);
L
Linus Torvalds 已提交
269

270
#ifdef CONFIG_LOCKDEP
271
/*
272
 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288
 * 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,
289
	 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
290
	 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154,
291
	 ARPHRD_VOID, ARPHRD_NONE};
292

293
static const char *const netdev_lock_name[] =
294 295 296 297 298 299 300 301 302 303 304 305 306
	{"_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",
307
	 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
308
	 "_xmit_PHONET_PIPE", "_xmit_IEEE802154",
309
	 "_xmit_VOID", "_xmit_NONE"};
310 311

static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
312
static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
313 314 315 316 317 318 319 320 321 322 323 324

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;
}

325 326
static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
						 unsigned short dev_type)
327 328 329 330 331 332 333
{
	int i;

	i = netdev_lock_pos(dev_type);
	lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
				   netdev_lock_name[i]);
}
334 335 336 337 338 339 340 341 342 343

static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
{
	int i;

	i = netdev_lock_pos(dev->type);
	lockdep_set_class_and_name(&dev->addr_list_lock,
				   &netdev_addr_lock_key[i],
				   netdev_lock_name[i]);
}
344
#else
345 346 347 348 349
static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
						 unsigned short dev_type)
{
}
static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
350 351 352
{
}
#endif
L
Linus Torvalds 已提交
353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383

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

		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.
 *
384
 *	This call does not sleep therefore it can not
L
Linus Torvalds 已提交
385 386 387 388 389 390 391 392 393
 *	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);
S
Stephen Hemminger 已提交
394
	if (pt->type == htons(ETH_P_ALL))
L
Linus Torvalds 已提交
395
		list_add_rcu(&pt->list, &ptype_all);
S
Stephen Hemminger 已提交
396
	else {
397
		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
L
Linus Torvalds 已提交
398 399 400 401
		list_add_rcu(&pt->list, &ptype_base[hash]);
	}
	spin_unlock_bh(&ptype_lock);
}
E
Eric Dumazet 已提交
402
EXPORT_SYMBOL(dev_add_pack);
L
Linus Torvalds 已提交
403 404 405 406 407 408 409 410

/**
 *	__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
411
 *	returns.
L
Linus Torvalds 已提交
412 413 414 415 416 417 418 419 420 421 422 423
 *
 *      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);

S
Stephen Hemminger 已提交
424
	if (pt->type == htons(ETH_P_ALL))
L
Linus Torvalds 已提交
425
		head = &ptype_all;
S
Stephen Hemminger 已提交
426
	else
427
		head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
L
Linus Torvalds 已提交
428 429 430 431 432 433 434 435 436 437 438 439

	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);
}
E
Eric Dumazet 已提交
440 441
EXPORT_SYMBOL(__dev_remove_pack);

L
Linus Torvalds 已提交
442 443 444 445 446 447 448 449 450 451 452 453 454 455 456
/**
 *	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);
457

L
Linus Torvalds 已提交
458 459
	synchronize_net();
}
E
Eric Dumazet 已提交
460
EXPORT_SYMBOL(dev_remove_pack);
L
Linus Torvalds 已提交
461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488

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

		      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));
489
			strlcpy(s[i].name, name, IFNAMSIZ);
L
Linus Torvalds 已提交
490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513
			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] != ' ' &&
514
		    !strcmp(dev->name, s[i].name)) {
L
Linus Torvalds 已提交
515 516 517 518 519 520 521 522 523
			dev->irq 	= s[i].map.irq;
			dev->base_addr 	= s[i].map.base_addr;
			dev->mem_start 	= s[i].map.mem_start;
			dev->mem_end 	= s[i].map.mem_end;
			return 1;
		}
	}
	return 0;
}
E
Eric Dumazet 已提交
524
EXPORT_SYMBOL(netdev_boot_setup_check);
L
Linus Torvalds 已提交
525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548


/**
 *	netdev_boot_base	- get address from boot time settings
 *	@prefix: prefix for network device
 *	@unit: id for network device
 *
 * 	Check boot time settings for the base address of device.
 *	The found settings are set for the device to be used
 *	later in the device probing.
 *	Returns 0 if no settings found.
 */
unsigned long netdev_boot_base(const char *prefix, int unit)
{
	const struct netdev_boot_setup *s = dev_boot_setup;
	char name[IFNAMSIZ];
	int i;

	sprintf(name, "%s%d", prefix, unit);

	/*
	 * If device already registered then return base of 1
	 * to indicate not to probe for this interface
	 */
549
	if (__dev_get_by_name(&init_net, name))
L
Linus Torvalds 已提交
550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594
		return 1;

	for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
		if (!strcmp(name, s[i].name))
			return s[i].map.base_addr;
	return 0;
}

/*
 * Saves at boot time configured settings for any netdevice.
 */
int __init netdev_boot_setup(char *str)
{
	int ints[5];
	struct ifmap map;

	str = get_options(str, ARRAY_SIZE(ints), ints);
	if (!str || !*str)
		return 0;

	/* Save settings */
	memset(&map, 0, sizeof(map));
	if (ints[0] > 0)
		map.irq = ints[1];
	if (ints[0] > 1)
		map.base_addr = ints[2];
	if (ints[0] > 2)
		map.mem_start = ints[3];
	if (ints[0] > 3)
		map.mem_end = ints[4];

	/* Add new entry to the list */
	return netdev_boot_setup_add(str, &map);
}

__setup("netdev=", netdev_boot_setup);

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

			    Device Interface Subroutines

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

/**
 *	__dev_get_by_name	- find a device by its name
595
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
596 597 598 599 600 601 602 603 604
 *	@name: name to find
 *
 *	Find an interface by name. Must be called under RTNL semaphore
 *	or @dev_base_lock. If the name is found a pointer to the device
 *	is returned. If the name is not found then %NULL is returned. The
 *	reference counters are not incremented so the caller must be
 *	careful with locks.
 */

605
struct net_device *__dev_get_by_name(struct net *net, const char *name)
L
Linus Torvalds 已提交
606 607
{
	struct hlist_node *p;
E
Eric Dumazet 已提交
608 609
	struct net_device *dev;
	struct hlist_head *head = dev_name_hash(net, name);
L
Linus Torvalds 已提交
610

E
Eric Dumazet 已提交
611
	hlist_for_each_entry(dev, p, head, name_hlist)
L
Linus Torvalds 已提交
612 613
		if (!strncmp(dev->name, name, IFNAMSIZ))
			return dev;
E
Eric Dumazet 已提交
614

L
Linus Torvalds 已提交
615 616
	return NULL;
}
E
Eric Dumazet 已提交
617
EXPORT_SYMBOL(__dev_get_by_name);
L
Linus Torvalds 已提交
618

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

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

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

	return NULL;
}
EXPORT_SYMBOL(dev_get_by_name_rcu);

L
Linus Torvalds 已提交
645 646
/**
 *	dev_get_by_name		- find a device by its name
647
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
648 649 650 651 652 653 654 655 656
 *	@name: name to find
 *
 *	Find an interface by name. This can be called from any
 *	context and does its own locking. The returned handle has
 *	the usage count incremented and the caller must use dev_put() to
 *	release it when it is no longer needed. %NULL is returned if no
 *	matching device is found.
 */

657
struct net_device *dev_get_by_name(struct net *net, const char *name)
L
Linus Torvalds 已提交
658 659 660
{
	struct net_device *dev;

661 662
	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
L
Linus Torvalds 已提交
663 664
	if (dev)
		dev_hold(dev);
665
	rcu_read_unlock();
L
Linus Torvalds 已提交
666 667
	return dev;
}
E
Eric Dumazet 已提交
668
EXPORT_SYMBOL(dev_get_by_name);
L
Linus Torvalds 已提交
669 670 671

/**
 *	__dev_get_by_index - find a device by its ifindex
672
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
673 674 675 676 677 678 679 680 681
 *	@ifindex: index of device
 *
 *	Search for an interface by index. Returns %NULL if the device
 *	is not found or a pointer to the device. The device has not
 *	had its reference counter increased so the caller must be careful
 *	about locking. The caller must hold either the RTNL semaphore
 *	or @dev_base_lock.
 */

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

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

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

696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720
/**
 *	dev_get_by_index_rcu - find a device by its ifindex
 *	@net: the applicable net namespace
 *	@ifindex: index of device
 *
 *	Search for an interface by index. Returns %NULL if the device
 *	is not found or a pointer to the device. The device has not
 *	had its reference counter increased so the caller must be careful
 *	about locking. The caller must hold RCU lock.
 */

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

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

	return NULL;
}
EXPORT_SYMBOL(dev_get_by_index_rcu);

L
Linus Torvalds 已提交
721 722 723

/**
 *	dev_get_by_index - find a device by its ifindex
724
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
725 726 727 728 729 730 731 732
 *	@ifindex: index of device
 *
 *	Search for an interface by index. Returns NULL if the device
 *	is not found or a pointer to the device. The device returned has
 *	had a reference added and the pointer is safe until the user calls
 *	dev_put to indicate they have finished with it.
 */

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

737 738
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifindex);
L
Linus Torvalds 已提交
739 740
	if (dev)
		dev_hold(dev);
741
	rcu_read_unlock();
L
Linus Torvalds 已提交
742 743
	return dev;
}
E
Eric Dumazet 已提交
744
EXPORT_SYMBOL(dev_get_by_index);
L
Linus Torvalds 已提交
745 746 747

/**
 *	dev_getbyhwaddr - find a device by its hardware address
748
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
749 750 751 752 753 754 755 756 757 758 759 760
 *	@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
 */

761
struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
L
Linus Torvalds 已提交
762 763 764 765 766
{
	struct net_device *dev;

	ASSERT_RTNL();

767
	for_each_netdev(net, dev)
L
Linus Torvalds 已提交
768 769
		if (dev->type == type &&
		    !memcmp(dev->dev_addr, ha, dev->addr_len))
770 771 772
			return dev;

	return NULL;
L
Linus Torvalds 已提交
773
}
774 775
EXPORT_SYMBOL(dev_getbyhwaddr);

776
struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
L
Linus Torvalds 已提交
777 778 779
{
	struct net_device *dev;

780
	ASSERT_RTNL();
781
	for_each_netdev(net, dev)
782
		if (dev->type == type)
783 784 785
			return dev;

	return NULL;
786 787 788
}
EXPORT_SYMBOL(__dev_getfirstbyhwtype);

789
struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
790
{
791
	struct net_device *dev, *ret = NULL;
792

793 794 795 796 797 798 799 800 801
	rcu_read_lock();
	for_each_netdev_rcu(net, dev)
		if (dev->type == type) {
			dev_hold(dev);
			ret = dev;
			break;
		}
	rcu_read_unlock();
	return ret;
L
Linus Torvalds 已提交
802 803 804 805 806
}
EXPORT_SYMBOL(dev_getfirstbyhwtype);

/**
 *	dev_get_by_flags - find any device with given flags
807
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
808 809 810 811
 *	@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
812
 *	is not found or a pointer to the device. The device returned has
L
Linus Torvalds 已提交
813 814 815 816
 *	had a reference added and the pointer is safe until the user calls
 *	dev_put to indicate they have finished with it.
 */

E
Eric Dumazet 已提交
817 818
struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags,
				    unsigned short mask)
L
Linus Torvalds 已提交
819
{
820
	struct net_device *dev, *ret;
L
Linus Torvalds 已提交
821

822
	ret = NULL;
823 824
	rcu_read_lock();
	for_each_netdev_rcu(net, dev) {
L
Linus Torvalds 已提交
825 826
		if (((dev->flags ^ if_flags) & mask) == 0) {
			dev_hold(dev);
827
			ret = dev;
L
Linus Torvalds 已提交
828 829 830
			break;
		}
	}
831
	rcu_read_unlock();
832
	return ret;
L
Linus Torvalds 已提交
833
}
E
Eric Dumazet 已提交
834
EXPORT_SYMBOL(dev_get_by_flags);
L
Linus Torvalds 已提交
835 836 837 838 839 840

/**
 *	dev_valid_name - check if name is okay for network device
 *	@name: name string
 *
 *	Network device names need to be valid file names to
841 842
 *	to allow sysfs to work.  We also disallow any kind of
 *	whitespace.
L
Linus Torvalds 已提交
843
 */
844
int dev_valid_name(const char *name)
L
Linus Torvalds 已提交
845
{
846 847
	if (*name == '\0')
		return 0;
848 849
	if (strlen(name) >= IFNAMSIZ)
		return 0;
850 851 852 853 854 855 856 857 858
	if (!strcmp(name, ".") || !strcmp(name, ".."))
		return 0;

	while (*name) {
		if (*name == '/' || isspace(*name))
			return 0;
		name++;
	}
	return 1;
L
Linus Torvalds 已提交
859
}
E
Eric Dumazet 已提交
860
EXPORT_SYMBOL(dev_valid_name);
L
Linus Torvalds 已提交
861 862

/**
863 864
 *	__dev_alloc_name - allocate a name for a device
 *	@net: network namespace to allocate the device name in
L
Linus Torvalds 已提交
865
 *	@name: name format string
866
 *	@buf:  scratch buffer and result name string
L
Linus Torvalds 已提交
867 868
 *
 *	Passed a format string - eg "lt%d" it will try and find a suitable
S
Stephen Hemminger 已提交
869 870 871 872 873 874
 *	id. It scans list of devices to build up a free map, then chooses
 *	the first empty slot. The caller must hold the dev_base or rtnl lock
 *	while allocating the name and adding the device in order to avoid
 *	duplicates.
 *	Limited to bits_per_byte * page size devices (ie 32K on most platforms).
 *	Returns the number of the unit assigned or a negative errno code.
L
Linus Torvalds 已提交
875 876
 */

877
static int __dev_alloc_name(struct net *net, const char *name, char *buf)
L
Linus Torvalds 已提交
878 879 880 881
{
	int i = 0;
	const char *p;
	const int max_netdevices = 8*PAGE_SIZE;
S
Stephen Hemminger 已提交
882
	unsigned long *inuse;
L
Linus Torvalds 已提交
883 884 885 886 887 888 889 890 891 892 893 894 895
	struct net_device *d;

	p = strnchr(name, IFNAMSIZ-1, '%');
	if (p) {
		/*
		 * Verify the string as this thing may have come from
		 * the user.  There must be either one "%d" and no other "%"
		 * characters.
		 */
		if (p[1] != 'd' || strchr(p + 2, '%'))
			return -EINVAL;

		/* Use one page as a bit array of possible slots */
S
Stephen Hemminger 已提交
896
		inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
L
Linus Torvalds 已提交
897 898 899
		if (!inuse)
			return -ENOMEM;

900
		for_each_netdev(net, d) {
L
Linus Torvalds 已提交
901 902 903 904 905 906
			if (!sscanf(d->name, name, &i))
				continue;
			if (i < 0 || i >= max_netdevices)
				continue;

			/*  avoid cases where sscanf is not exact inverse of printf */
907
			snprintf(buf, IFNAMSIZ, name, i);
L
Linus Torvalds 已提交
908 909 910 911 912 913 914 915
			if (!strncmp(buf, d->name, IFNAMSIZ))
				set_bit(i, inuse);
		}

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

916 917
	if (buf != name)
		snprintf(buf, IFNAMSIZ, name, i);
918
	if (!__dev_get_by_name(net, buf))
L
Linus Torvalds 已提交
919 920 921 922 923 924 925 926 927
		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;
}

928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947
/**
 *	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;

948 949
	BUG_ON(!dev_net(dev));
	net = dev_net(dev);
950 951 952 953 954
	ret = __dev_alloc_name(net, name, buf);
	if (ret >= 0)
		strlcpy(dev->name, buf, IFNAMSIZ);
	return ret;
}
E
Eric Dumazet 已提交
955
EXPORT_SYMBOL(dev_alloc_name);
956

957 958 959 960 961 962 963 964 965 966 967 968 969 970 971
static int dev_get_valid_name(struct net *net, const char *name, char *buf,
			      bool fmt)
{
	if (!dev_valid_name(name))
		return -EINVAL;

	if (fmt && strchr(name, '%'))
		return __dev_alloc_name(net, name, buf);
	else if (__dev_get_by_name(net, name))
		return -EEXIST;
	else if (buf != name)
		strlcpy(buf, name, IFNAMSIZ);

	return 0;
}
L
Linus Torvalds 已提交
972 973 974 975 976 977 978 979 980

/**
 *	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.
 */
981
int dev_change_name(struct net_device *dev, const char *newname)
L
Linus Torvalds 已提交
982
{
983
	char oldname[IFNAMSIZ];
L
Linus Torvalds 已提交
984
	int err = 0;
985
	int ret;
986
	struct net *net;
L
Linus Torvalds 已提交
987 988

	ASSERT_RTNL();
989
	BUG_ON(!dev_net(dev));
L
Linus Torvalds 已提交
990

991
	net = dev_net(dev);
L
Linus Torvalds 已提交
992 993 994
	if (dev->flags & IFF_UP)
		return -EBUSY;

995 996 997
	if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
		return 0;

998 999
	memcpy(oldname, dev->name, IFNAMSIZ);

1000 1001 1002
	err = dev_get_valid_name(net, newname, dev->name, 1);
	if (err < 0)
		return err;
L
Linus Torvalds 已提交
1003

1004
rollback:
1005 1006 1007
	/* For now only devices in the initial network namespace
	 * are in sysfs.
	 */
O
Octavian Purdila 已提交
1008
	if (net_eq(net, &init_net)) {
1009 1010 1011 1012 1013
		ret = device_rename(&dev->dev, dev->name);
		if (ret) {
			memcpy(dev->name, oldname, IFNAMSIZ);
			return ret;
		}
1014
	}
1015 1016

	write_lock_bh(&dev_base_lock);
1017
	hlist_del(&dev->name_hlist);
1018 1019 1020 1021 1022 1023
	write_unlock_bh(&dev_base_lock);

	synchronize_rcu();

	write_lock_bh(&dev_base_lock);
	hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1024 1025
	write_unlock_bh(&dev_base_lock);

1026
	ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1027 1028 1029
	ret = notifier_to_errno(ret);

	if (ret) {
1030 1031
		/* err >= 0 after dev_alloc_name() or stores the first errno */
		if (err >= 0) {
1032 1033 1034
			err = ret;
			memcpy(dev->name, oldname, IFNAMSIZ);
			goto rollback;
1035 1036 1037 1038
		} else {
			printk(KERN_ERR
			       "%s: name change rollback failed: %d.\n",
			       dev->name, ret);
1039 1040
		}
	}
L
Linus Torvalds 已提交
1041 1042 1043 1044

	return err;
}

1045 1046 1047 1048
/**
 *	dev_set_alias - change ifalias of a device
 *	@dev: device
 *	@alias: name up to IFALIASZ
1049
 *	@len: limit of bytes to copy from info
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
 *
 *	Set ifalias for a device,
 */
int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
{
	ASSERT_RTNL();

	if (len >= IFALIASZ)
		return -EINVAL;

1060 1061 1062 1063 1064 1065 1066 1067
	if (!len) {
		if (dev->ifalias) {
			kfree(dev->ifalias);
			dev->ifalias = NULL;
		}
		return 0;
	}

E
Eric Dumazet 已提交
1068
	dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1069 1070 1071 1072 1073 1074 1075 1076
	if (!dev->ifalias)
		return -ENOMEM;

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


1077
/**
S
Stephen Hemminger 已提交
1078
 *	netdev_features_change - device changes features
1079 1080 1081 1082 1083 1084
 *	@dev: device to cause notification
 *
 *	Called to indicate a device has changed features.
 */
void netdev_features_change(struct net_device *dev)
{
1085
	call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1086 1087 1088
}
EXPORT_SYMBOL(netdev_features_change);

L
Linus Torvalds 已提交
1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
/**
 *	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) {
1100
		call_netdevice_notifiers(NETDEV_CHANGE, dev);
L
Linus Torvalds 已提交
1101 1102 1103
		rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
	}
}
E
Eric Dumazet 已提交
1104
EXPORT_SYMBOL(netdev_state_change);
L
Linus Torvalds 已提交
1105

1106
int netdev_bonding_change(struct net_device *dev, unsigned long event)
1107
{
1108
	return call_netdevice_notifiers(event, dev);
1109 1110 1111
}
EXPORT_SYMBOL(netdev_bonding_change);

L
Linus Torvalds 已提交
1112 1113
/**
 *	dev_load 	- load a network module
1114
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
1115 1116 1117 1118 1119 1120 1121
 *	@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.
 */

1122
void dev_load(struct net *net, const char *name)
L
Linus Torvalds 已提交
1123
{
1124
	struct net_device *dev;
L
Linus Torvalds 已提交
1125

1126 1127 1128
	rcu_read_lock();
	dev = dev_get_by_name_rcu(net, name);
	rcu_read_unlock();
L
Linus Torvalds 已提交
1129

1130
	if (!dev && capable(CAP_NET_ADMIN))
L
Linus Torvalds 已提交
1131 1132
		request_module("%s", name);
}
E
Eric Dumazet 已提交
1133
EXPORT_SYMBOL(dev_load);
L
Linus Torvalds 已提交
1134

1135
static int __dev_open(struct net_device *dev)
L
Linus Torvalds 已提交
1136
{
1137
	const struct net_device_ops *ops = dev->netdev_ops;
1138
	int ret;
L
Linus Torvalds 已提交
1139

1140 1141
	ASSERT_RTNL();

L
Linus Torvalds 已提交
1142 1143 1144 1145 1146 1147
	/*
	 *	Is it even present?
	 */
	if (!netif_device_present(dev))
		return -ENODEV;

1148 1149 1150 1151 1152
	ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		return ret;

L
Linus Torvalds 已提交
1153 1154 1155 1156
	/*
	 *	Call device private open method
	 */
	set_bit(__LINK_STATE_START, &dev->state);
1157

1158 1159
	if (ops->ndo_validate_addr)
		ret = ops->ndo_validate_addr(dev);
1160

1161 1162
	if (!ret && ops->ndo_open)
		ret = ops->ndo_open(dev);
L
Linus Torvalds 已提交
1163

1164
	/*
L
Linus Torvalds 已提交
1165 1166 1167
	 *	If it went open OK then:
	 */

1168 1169 1170
	if (ret)
		clear_bit(__LINK_STATE_START, &dev->state);
	else {
L
Linus Torvalds 已提交
1171 1172 1173 1174 1175
		/*
		 *	Set the flags.
		 */
		dev->flags |= IFF_UP;

1176 1177 1178
		/*
		 *	Enable NET_DMA
		 */
1179
		net_dmaengine_get();
1180

L
Linus Torvalds 已提交
1181 1182 1183
		/*
		 *	Initialize multicasting status
		 */
1184
		dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
1185 1186 1187 1188 1189 1190

		/*
		 *	Wakeup transmit queue engine
		 */
		dev_activate(dev);
	}
1191

L
Linus Torvalds 已提交
1192 1193 1194 1195
	return ret;
}

/**
1196 1197
 *	dev_open	- prepare an interface for use.
 *	@dev:	device to open
L
Linus Torvalds 已提交
1198
 *
1199 1200 1201 1202 1203 1204 1205
 *	Takes a device from down to up state. The device's private open
 *	function is invoked and then the multicast lists are loaded. Finally
 *	the device is moved into the up state and a %NETDEV_UP message is
 *	sent to the netdev notifier chain.
 *
 *	Calling this function on an active interface is a nop. On a failure
 *	a negative errno code is returned.
L
Linus Torvalds 已提交
1206
 */
1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234
int dev_open(struct net_device *dev)
{
	int ret;

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

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

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

	return ret;
}
EXPORT_SYMBOL(dev_open);

static int __dev_close(struct net_device *dev)
L
Linus Torvalds 已提交
1235
{
1236
	const struct net_device_ops *ops = dev->netdev_ops;
1237

1238
	ASSERT_RTNL();
1239 1240
	might_sleep();

L
Linus Torvalds 已提交
1241 1242 1243 1244
	/*
	 *	Tell people we are going down, so that they can
	 *	prepare to death, when device is still operating.
	 */
1245
	call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
L
Linus Torvalds 已提交
1246 1247 1248 1249

	clear_bit(__LINK_STATE_START, &dev->state);

	/* Synchronize to scheduled poll. We cannot touch poll list,
1250 1251 1252 1253 1254
	 * it can be even on different cpu. So just clear netif_running().
	 *
	 * dev->stop() will invoke napi_disable() on all of it's
	 * napi_struct instances on this device.
	 */
L
Linus Torvalds 已提交
1255 1256
	smp_mb__after_clear_bit(); /* Commit netif_running(). */

1257 1258
	dev_deactivate(dev);

L
Linus Torvalds 已提交
1259 1260 1261 1262 1263 1264 1265
	/*
	 *	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.
	 */
1266 1267
	if (ops->ndo_stop)
		ops->ndo_stop(dev);
L
Linus Torvalds 已提交
1268 1269 1270 1271 1272 1273 1274 1275

	/*
	 *	Device is now down.
	 */

	dev->flags &= ~IFF_UP;

	/*
1276
	 *	Shutdown NET_DMA
L
Linus Torvalds 已提交
1277
	 */
1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297
	net_dmaengine_put();

	return 0;
}

/**
 *	dev_close - shutdown an interface.
 *	@dev: device to shutdown
 *
 *	This function moves an active device into down state. A
 *	%NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
 *	is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
 *	chain.
 */
int dev_close(struct net_device *dev)
{
	if (!(dev->flags & IFF_UP))
		return 0;

	__dev_close(dev);
L
Linus Torvalds 已提交
1298

1299
	/*
1300
	 * Tell people we are down
1301
	 */
1302 1303
	rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING);
	call_netdevice_notifiers(NETDEV_DOWN, dev);
1304

L
Linus Torvalds 已提交
1305 1306
	return 0;
}
E
Eric Dumazet 已提交
1307
EXPORT_SYMBOL(dev_close);
L
Linus Torvalds 已提交
1308 1309


1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
/**
 *	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);


1333 1334
static int dev_boot_phase = 1;

L
Linus Torvalds 已提交
1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349
/*
 *	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
1350
 *	to the new notifier to allow device to have a race free
L
Linus Torvalds 已提交
1351 1352 1353 1354 1355 1356
 *	view of the network device list.
 */

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

	rtnl_lock();
1362
	err = raw_notifier_chain_register(&netdev_chain, nb);
1363 1364
	if (err)
		goto unlock;
1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375
	if (dev_boot_phase)
		goto unlock;
	for_each_net(net) {
		for_each_netdev(net, dev) {
			err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
			err = notifier_to_errno(err);
			if (err)
				goto rollback;

			if (!(dev->flags & IFF_UP))
				continue;
L
Linus Torvalds 已提交
1376

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

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

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

1392 1393 1394 1395 1396
			if (dev->flags & IFF_UP) {
				nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
				nb->notifier_call(nb, NETDEV_DOWN, dev);
			}
			nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1397
			nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev);
1398 1399
		}
	}
1400 1401

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

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

int unregister_netdevice_notifier(struct notifier_block *nb)
{
1418 1419 1420
	int err;

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

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

1436
int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
L
Linus Torvalds 已提交
1437
{
1438
	ASSERT_RTNL();
1439
	return raw_notifier_call_chain(&netdev_chain, val, dev);
L
Linus Torvalds 已提交
1440 1441 1442 1443 1444 1445 1446 1447 1448
}

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

void net_enable_timestamp(void)
{
	atomic_inc(&netstamp_needed);
}
E
Eric Dumazet 已提交
1449
EXPORT_SYMBOL(net_enable_timestamp);
L
Linus Torvalds 已提交
1450 1451 1452 1453 1454

void net_disable_timestamp(void)
{
	atomic_dec(&netstamp_needed);
}
E
Eric Dumazet 已提交
1455
EXPORT_SYMBOL(net_disable_timestamp);
L
Linus Torvalds 已提交
1456

1457
static inline void net_timestamp(struct sk_buff *skb)
L
Linus Torvalds 已提交
1458 1459
{
	if (atomic_read(&netstamp_needed))
1460
		__net_timestamp(skb);
1461 1462
	else
		skb->tstamp.tv64 = 0;
L
Linus Torvalds 已提交
1463 1464
}

1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492
/**
 * dev_forward_skb - loopback an skb to another netif
 *
 * @dev: destination network device
 * @skb: buffer to forward
 *
 * return values:
 *	NET_RX_SUCCESS	(no congestion)
 *	NET_RX_DROP     (packet was dropped)
 *
 * dev_forward_skb can be used for injecting an skb from the
 * start_xmit function of one device into the receive queue
 * of another device.
 *
 * The receiving device may be in another namespace, so
 * we have to clear all information in the skb that could
 * impact namespace isolation.
 */
int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
{
	skb_orphan(skb);

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

	if (skb->len > (dev->mtu + dev->hard_header_len))
		return NET_RX_DROP;

1493
	skb_set_dev(skb, dev);
1494 1495 1496 1497 1498 1499 1500
	skb->tstamp.tv64 = 0;
	skb->pkt_type = PACKET_HOST;
	skb->protocol = eth_type_trans(skb, dev);
	return netif_rx(skb);
}
EXPORT_SYMBOL_GPL(dev_forward_skb);

L
Linus Torvalds 已提交
1501 1502 1503 1504 1505
/*
 *	Support routine. Sends outgoing frames to any network
 *	taps currently in use.
 */

1506
static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
L
Linus Torvalds 已提交
1507 1508
{
	struct packet_type *ptype;
1509

1510 1511 1512 1513
#ifdef CONFIG_NET_CLS_ACT
	if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
		net_timestamp(skb);
#else
1514
	net_timestamp(skb);
1515
#endif
L
Linus Torvalds 已提交
1516 1517 1518 1519 1520 1521 1522 1523 1524

	rcu_read_lock();
	list_for_each_entry_rcu(ptype, &ptype_all, list) {
		/* Never send packets back to the socket
		 * they originated from - MvS (miquels@drinkel.ow.org)
		 */
		if ((ptype->dev == dev || !ptype->dev) &&
		    (ptype->af_packet_priv == NULL ||
		     (struct sock *)ptype->af_packet_priv != skb->sk)) {
E
Eric Dumazet 已提交
1525
			struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
L
Linus Torvalds 已提交
1526 1527 1528 1529 1530 1531 1532
			if (!skb2)
				break;

			/* skb->nh should be correctly
			   set by sender, so that the second statement is
			   just protection against buggy protocols.
			 */
1533
			skb_reset_mac_header(skb2);
L
Linus Torvalds 已提交
1534

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

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

1552

1553
static inline void __netif_reschedule(struct Qdisc *q)
1554
{
1555 1556
	struct softnet_data *sd;
	unsigned long flags;
1557

1558 1559
	local_irq_save(flags);
	sd = &__get_cpu_var(softnet_data);
1560 1561 1562
	q->next_sched = NULL;
	*sd->output_queue_tailp = q;
	sd->output_queue_tailp = &q->next_sched;
1563 1564 1565 1566 1567 1568 1569 1570
	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	local_irq_restore(flags);
}

void __netif_schedule(struct Qdisc *q)
{
	if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
		__netif_reschedule(q);
1571 1572 1573
}
EXPORT_SYMBOL(__netif_schedule);

1574
void dev_kfree_skb_irq(struct sk_buff *skb)
1575
{
1576 1577 1578
	if (atomic_dec_and_test(&skb->users)) {
		struct softnet_data *sd;
		unsigned long flags;
1579

1580 1581 1582 1583 1584 1585 1586
		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);
	}
1587
}
1588
EXPORT_SYMBOL(dev_kfree_skb_irq);
1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599

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);


1600 1601 1602 1603 1604 1605
/**
 * netif_device_detach - mark device as removed
 * @dev: network device
 *
 * Mark device as removed from system and therefore no longer available.
 */
1606 1607 1608 1609
void netif_device_detach(struct net_device *dev)
{
	if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
1610
		netif_tx_stop_all_queues(dev);
1611 1612 1613 1614
	}
}
EXPORT_SYMBOL(netif_device_detach);

1615 1616 1617 1618 1619 1620
/**
 * netif_device_attach - mark device as attached
 * @dev: network device
 *
 * Mark device as attached from system and restart if needed.
 */
1621 1622 1623 1624
void netif_device_attach(struct net_device *dev)
{
	if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
	    netif_running(dev)) {
1625
		netif_tx_wake_all_queues(dev);
1626
		__netdev_watchdog_up(dev);
1627 1628 1629 1630
	}
}
EXPORT_SYMBOL(netif_device_attach);

1631 1632 1633 1634 1635 1636
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) &&
1637 1638 1639
		 protocol == htons(ETH_P_IPV6)) ||
		((features & NETIF_F_FCOE_CRC) &&
		 protocol == htons(ETH_P_FCOE)));
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655
}

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;
}
1656

1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686
/**
 * skb_dev_set -- assign a new device to a buffer
 * @skb: buffer for the new device
 * @dev: network device
 *
 * If an skb is owned by a device already, we have to reset
 * all data private to the namespace a device belongs to
 * before assigning it a new device.
 */
#ifdef CONFIG_NET_NS
void skb_set_dev(struct sk_buff *skb, struct net_device *dev)
{
	skb_dst_drop(skb);
	if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) {
		secpath_reset(skb);
		nf_reset(skb);
		skb_init_secmark(skb);
		skb->mark = 0;
		skb->priority = 0;
		skb->nf_trace = 0;
		skb->ipvs_property = 0;
#ifdef CONFIG_NET_SCHED
		skb->tc_index = 0;
#endif
	}
	skb->dev = dev;
}
EXPORT_SYMBOL(skb_set_dev);
#endif /* CONFIG_NET_NS */

L
Linus Torvalds 已提交
1687 1688 1689 1690
/*
 * Invalidate hardware checksum when packet is to be mangled, and
 * complete checksum manually on outgoing path.
 */
1691
int skb_checksum_help(struct sk_buff *skb)
L
Linus Torvalds 已提交
1692
{
1693
	__wsum csum;
1694
	int ret = 0, offset;
L
Linus Torvalds 已提交
1695

1696
	if (skb->ip_summed == CHECKSUM_COMPLETE)
1697 1698 1699 1700 1701
		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
1702 1703
	}

1704 1705 1706 1707 1708 1709 1710 1711 1712
	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
1713 1714 1715 1716 1717
		ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
		if (ret)
			goto out;
	}

1718
	*(__sum16 *)(skb->data + offset) = csum_fold(csum);
1719
out_set_summed:
L
Linus Torvalds 已提交
1720
	skb->ip_summed = CHECKSUM_NONE;
1721
out:
L
Linus Torvalds 已提交
1722 1723
	return ret;
}
E
Eric Dumazet 已提交
1724
EXPORT_SYMBOL(skb_checksum_help);
L
Linus Torvalds 已提交
1725

1726 1727 1728
/**
 *	skb_gso_segment - Perform segmentation on skb.
 *	@skb: buffer to segment
1729
 *	@features: features for the output path (see dev->features)
1730 1731
 *
 *	This function segments the given skb and returns a list of segments.
1732 1733 1734
 *
 *	It may return NULL if the skb requires no segmentation.  This is
 *	only possible when GSO is used for verifying header integrity.
1735
 */
1736
struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1737 1738 1739
{
	struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
	struct packet_type *ptype;
A
Al Viro 已提交
1740
	__be16 type = skb->protocol;
1741
	int err;
1742

1743
	skb_reset_mac_header(skb);
1744
	skb->mac_len = skb->network_header - skb->mac_header;
1745 1746
	__skb_pull(skb, skb->mac_len);

1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759
	if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
		struct net_device *dev = skb->dev;
		struct ethtool_drvinfo info = {};

		if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
			dev->ethtool_ops->get_drvinfo(dev, &info);

		WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
			"ip_summed=%d",
		     info.driver, dev ? dev->features : 0L,
		     skb->sk ? skb->sk->sk_route_caps : 0L,
		     skb->len, skb->data_len, skb->ip_summed);

1760 1761 1762 1763 1764
		if (skb_header_cloned(skb) &&
		    (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
			return ERR_PTR(err);
	}

1765
	rcu_read_lock();
1766 1767
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1768
		if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1769
			if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1770 1771 1772 1773
				err = ptype->gso_send_check(skb);
				segs = ERR_PTR(err);
				if (err || skb_gso_ok(skb, features))
					break;
1774 1775
				__skb_push(skb, (skb->data -
						 skb_network_header(skb)));
1776
			}
1777
			segs = ptype->gso_segment(skb, features);
1778 1779 1780 1781 1782
			break;
		}
	}
	rcu_read_unlock();

1783
	__skb_push(skb, skb->data - skb_mac_header(skb));
1784

1785 1786 1787 1788
	return segs;
}
EXPORT_SYMBOL(skb_gso_segment);

1789 1790 1791 1792 1793
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG
void netdev_rx_csum_fault(struct net_device *dev)
{
	if (net_ratelimit()) {
1794
		printk(KERN_ERR "%s: hw csum failure.\n",
1795
			dev ? dev->name : "<unknown>");
1796 1797 1798 1799 1800 1801
		dump_stack();
	}
}
EXPORT_SYMBOL(netdev_rx_csum_fault);
#endif

L
Linus Torvalds 已提交
1802 1803 1804 1805 1806
/* Actually, we should eliminate this check as soon as we know, that:
 * 1. IOMMU is present and allows to map all the memory.
 * 2. No high memory really exists on this machine.
 */

E
Eric Dumazet 已提交
1807
static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
L
Linus Torvalds 已提交
1808
{
1809
#ifdef CONFIG_HIGHMEM
L
Linus Torvalds 已提交
1810
	int i;
1811 1812 1813 1814 1815
	if (!(dev->features & NETIF_F_HIGHDMA)) {
		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
			if (PageHighMem(skb_shinfo(skb)->frags[i].page))
				return 1;
	}
L
Linus Torvalds 已提交
1816

1817 1818
	if (PCI_DMA_BUS_IS_PHYS) {
		struct device *pdev = dev->dev.parent;
L
Linus Torvalds 已提交
1819

E
Eric Dumazet 已提交
1820 1821
		if (!pdev)
			return 0;
1822 1823 1824 1825 1826 1827
		for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
			dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page);
			if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
				return 1;
		}
	}
1828
#endif
L
Linus Torvalds 已提交
1829 1830 1831
	return 0;
}

1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865
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;
1866 1867 1868 1869 1870 1871 1872 1873
	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;
1874

1875
	if (IS_ERR(segs))
1876 1877 1878 1879 1880 1881 1882 1883 1884
		return PTR_ERR(segs);

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

	return 0;
}

E
Eric Dumazet 已提交
1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895
/*
 * Try to orphan skb early, right before transmission by the device.
 * We cannot orphan skb if tx timestamp is requested, since
 * drivers need to call skb_tstamp_tx() to send the timestamp.
 */
static inline void skb_orphan_try(struct sk_buff *skb)
{
	if (!skb_tx(skb)->flags)
		skb_orphan(skb);
}

1896 1897
int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
			struct netdev_queue *txq)
1898
{
1899
	const struct net_device_ops *ops = dev->netdev_ops;
1900
	int rc = NETDEV_TX_OK;
1901

1902
	if (likely(!skb->next)) {
S
Stephen Hemminger 已提交
1903
		if (!list_empty(&ptype_all))
1904 1905
			dev_queue_xmit_nit(skb, dev);

1906 1907 1908 1909
		/*
		 * If device doesnt need skb->dst, release it right now while
		 * its hot in this cpu cache
		 */
E
Eric Dumazet 已提交
1910 1911 1912
		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
			skb_dst_drop(skb);

E
Eric Dumazet 已提交
1913
		skb_orphan_try(skb);
1914 1915 1916 1917 1918 1919 1920 1921

		if (netif_needs_gso(dev, skb)) {
			if (unlikely(dev_gso_segment(skb)))
				goto out_kfree_skb;
			if (skb->next)
				goto gso;
		}

1922
		rc = ops->ndo_start_xmit(skb, dev);
1923
		if (rc == NETDEV_TX_OK)
E
Eric Dumazet 已提交
1924
			txq_trans_update(txq);
1925
		return rc;
1926 1927
	}

1928
gso:
1929 1930 1931 1932 1933
	do {
		struct sk_buff *nskb = skb->next;

		skb->next = nskb->next;
		nskb->next = NULL;
1934 1935 1936 1937 1938 1939 1940 1941

		/*
		 * If device doesnt need nskb->dst, release it right now while
		 * its hot in this cpu cache
		 */
		if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
			skb_dst_drop(nskb);

1942
		rc = ops->ndo_start_xmit(nskb, dev);
1943
		if (unlikely(rc != NETDEV_TX_OK)) {
1944 1945
			if (rc & ~NETDEV_TX_MASK)
				goto out_kfree_gso_skb;
1946
			nskb->next = skb->next;
1947 1948 1949
			skb->next = nskb;
			return rc;
		}
E
Eric Dumazet 已提交
1950
		txq_trans_update(txq);
1951
		if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1952
			return NETDEV_TX_BUSY;
1953
	} while (skb->next);
1954

1955 1956 1957
out_kfree_gso_skb:
	if (likely(skb->next == NULL))
		skb->destructor = DEV_GSO_CB(skb)->destructor;
1958 1959
out_kfree_skb:
	kfree_skb(skb);
1960
	return rc;
1961 1962
}

T
Tom Herbert 已提交
1963
static u32 hashrnd __read_mostly;
D
David S. Miller 已提交
1964

1965
u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
1966
{
1967
	u32 hash;
D
David S. Miller 已提交
1968

1969 1970
	if (skb_rx_queue_recorded(skb)) {
		hash = skb_get_rx_queue(skb);
E
Eric Dumazet 已提交
1971
		while (unlikely(hash >= dev->real_num_tx_queues))
1972 1973 1974
			hash -= dev->real_num_tx_queues;
		return hash;
	}
1975 1976

	if (skb->sk && skb->sk->sk_hash)
1977
		hash = skb->sk->sk_hash;
1978
	else
E
Eric Dumazet 已提交
1979
		hash = (__force u16) skb->protocol;
1980

T
Tom Herbert 已提交
1981
	hash = jhash_1word(hash, hashrnd);
D
David S. Miller 已提交
1982 1983

	return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1984
}
1985
EXPORT_SYMBOL(skb_tx_hash);
1986

1987 1988 1989 1990
static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index)
{
	if (unlikely(queue_index >= dev->real_num_tx_queues)) {
		if (net_ratelimit()) {
E
Eric Dumazet 已提交
1991 1992 1993
			pr_warning("%s selects TX queue %d, but "
				"real number of TX queues is %d\n",
				dev->name, queue_index, dev->real_num_tx_queues);
1994 1995 1996 1997 1998 1999
		}
		return 0;
	}
	return queue_index;
}

2000 2001 2002
static struct netdev_queue *dev_pick_tx(struct net_device *dev,
					struct sk_buff *skb)
{
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
	u16 queue_index;
	struct sock *sk = skb->sk;

	if (sk_tx_queue_recorded(sk)) {
		queue_index = sk_tx_queue_get(sk);
	} else {
		const struct net_device_ops *ops = dev->netdev_ops;

		if (ops->ndo_select_queue) {
			queue_index = ops->ndo_select_queue(dev, skb);
2013
			queue_index = dev_cap_txqueue(dev, queue_index);
2014 2015 2016 2017
		} else {
			queue_index = 0;
			if (dev->real_num_tx_queues > 1)
				queue_index = skb_tx_hash(dev, skb);
2018

E
Eric Dumazet 已提交
2019
			if (sk) {
2020
				struct dst_entry *dst = rcu_dereference_check(sk->sk_dst_cache, 1);
E
Eric Dumazet 已提交
2021 2022 2023 2024

				if (dst && skb_dst(skb) == dst)
					sk_tx_queue_set(sk, queue_index);
			}
2025 2026
		}
	}
2027

2028 2029
	skb_set_queue_mapping(skb, queue_index);
	return netdev_get_tx_queue(dev, queue_index);
2030 2031
}

2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065
static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
				 struct net_device *dev,
				 struct netdev_queue *txq)
{
	spinlock_t *root_lock = qdisc_lock(q);
	int rc;

	spin_lock(root_lock);
	if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
		kfree_skb(skb);
		rc = NET_XMIT_DROP;
	} else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
		   !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) {
		/*
		 * This is a work-conserving queue; there are no old skbs
		 * waiting to be sent out; and the qdisc is not running -
		 * xmit the skb directly.
		 */
		__qdisc_update_bstats(q, skb->len);
		if (sch_direct_xmit(skb, q, dev, txq, root_lock))
			__qdisc_run(q);
		else
			clear_bit(__QDISC_STATE_RUNNING, &q->state);

		rc = NET_XMIT_SUCCESS;
	} else {
		rc = qdisc_enqueue_root(skb, q);
		qdisc_run(q);
	}
	spin_unlock(root_lock);

	return rc;
}

2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080
/*
 * Returns true if either:
 *	1. skb has frag_list and the device doesn't support FRAGLIST, or
 *	2. skb is fragmented and the device does not support SG, or if
 *	   at least one of fragments is in highmem and device does not
 *	   support DMA from it.
 */
static inline int skb_needs_linearize(struct sk_buff *skb,
				      struct net_device *dev)
{
	return (skb_has_frags(skb) && !(dev->features & NETIF_F_FRAGLIST)) ||
	       (skb_shinfo(skb)->nr_frags && (!(dev->features & NETIF_F_SG) ||
					      illegal_highdma(dev, skb)));
}

2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105
/**
 *	dev_queue_xmit - transmit a buffer
 *	@skb: buffer to transmit
 *
 *	Queue a buffer for transmission to a network device. The caller must
 *	have set the device and priority and built the buffer before calling
 *	this function. The function can be called from an interrupt.
 *
 *	A negative errno code is returned on a failure. A success does not
 *	guarantee the frame will be transmitted as it may be dropped due
 *	to congestion or traffic shaping.
 *
 * -----------------------------------------------------------------------------------
 *      I notice this method can also return errors from the queue disciplines,
 *      including NET_XMIT_DROP, which is a positive value.  So, errors can also
 *      be positive.
 *
 *      Regardless of the return value, the skb is consumed, so it is currently
 *      difficult to retry a send to this method.  (You can bump the ref count
 *      before sending to hold a reference for retry if you are careful.)
 *
 *      When calling this method, interrupts MUST be enabled.  This is because
 *      the BH enable code must have IRQs enabled so that it will not deadlock.
 *          --BLG
 */
L
Linus Torvalds 已提交
2106 2107 2108
int dev_queue_xmit(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
2109
	struct netdev_queue *txq;
L
Linus Torvalds 已提交
2110 2111 2112
	struct Qdisc *q;
	int rc = -ENOMEM;

2113 2114 2115 2116
	/* GSO will handle the following emulations directly. */
	if (netif_needs_gso(dev, skb))
		goto gso;

2117 2118
	/* Convert a paged skb to linear, if required */
	if (skb_needs_linearize(skb, dev) && __skb_linearize(skb))
L
Linus Torvalds 已提交
2119 2120 2121 2122 2123
		goto out_kfree_skb;

	/* If packet is not checksummed and device does not support
	 * checksumming for this protocol, complete checksumming here.
	 */
2124 2125 2126
	if (skb->ip_summed == CHECKSUM_PARTIAL) {
		skb_set_transport_header(skb, skb->csum_start -
					      skb_headroom(skb));
2127 2128
		if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
			goto out_kfree_skb;
2129
	}
L
Linus Torvalds 已提交
2130

2131
gso:
2132 2133
	/* Disable soft irqs for various locks below. Also
	 * stops preemption for RCU.
L
Linus Torvalds 已提交
2134
	 */
2135
	rcu_read_lock_bh();
L
Linus Torvalds 已提交
2136

2137
	txq = dev_pick_tx(dev, skb);
2138
	q = rcu_dereference_bh(txq->qdisc);
2139

L
Linus Torvalds 已提交
2140
#ifdef CONFIG_NET_CLS_ACT
E
Eric Dumazet 已提交
2141
	skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
L
Linus Torvalds 已提交
2142 2143
#endif
	if (q->enqueue) {
2144
		rc = __dev_xmit_skb(skb, q, dev, txq);
2145
		goto out;
L
Linus Torvalds 已提交
2146 2147 2148 2149 2150
	}

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

H
Herbert Xu 已提交
2151 2152
	   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
2153 2154 2155 2156 2157 2158 2159 2160 2161 2162
	   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 */

2163
		if (txq->xmit_lock_owner != cpu) {
L
Linus Torvalds 已提交
2164

2165
			HARD_TX_LOCK(dev, txq, cpu);
L
Linus Torvalds 已提交
2166

2167
			if (!netif_tx_queue_stopped(txq)) {
2168 2169
				rc = dev_hard_start_xmit(skb, dev, txq);
				if (dev_xmit_complete(rc)) {
2170
					HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
2171 2172 2173
					goto out;
				}
			}
2174
			HARD_TX_UNLOCK(dev, txq);
L
Linus Torvalds 已提交
2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187
			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;
2188
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
2189 2190 2191 2192 2193

out_kfree_skb:
	kfree_skb(skb);
	return rc;
out:
2194
	rcu_read_unlock_bh();
L
Linus Torvalds 已提交
2195 2196
	return rc;
}
E
Eric Dumazet 已提交
2197
EXPORT_SYMBOL(dev_queue_xmit);
L
Linus Torvalds 已提交
2198 2199 2200 2201 2202 2203


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

2204 2205 2206
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
2207 2208 2209

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

E
Eric Dumazet 已提交
2210
#ifdef CONFIG_RPS
T
Tom Herbert 已提交
2211 2212

/* One global table that all flow-based protocols share. */
2213
struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
T
Tom Herbert 已提交
2214 2215
EXPORT_SYMBOL(rps_sock_flow_table);

T
Tom Herbert 已提交
2216 2217 2218
/*
 * get_rps_cpu is called from netif_receive_skb and returns the target
 * CPU from the RPS map of the receiving queue for a given skb.
2219
 * rcu_read_lock must be held on entry.
T
Tom Herbert 已提交
2220
 */
T
Tom Herbert 已提交
2221 2222
static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
		       struct rps_dev_flow **rflowp)
T
Tom Herbert 已提交
2223 2224 2225 2226 2227
{
	struct ipv6hdr *ip6;
	struct iphdr *ip;
	struct netdev_rx_queue *rxqueue;
	struct rps_map *map;
T
Tom Herbert 已提交
2228 2229
	struct rps_dev_flow_table *flow_table;
	struct rps_sock_flow_table *sock_flow_table;
T
Tom Herbert 已提交
2230 2231
	int cpu = -1;
	u8 ip_proto;
T
Tom Herbert 已提交
2232
	u16 tcpu;
C
Changli Gao 已提交
2233 2234 2235 2236 2237
	u32 addr1, addr2, ihl;
	union {
		u32 v32;
		u16 v16[2];
	} ports;
T
Tom Herbert 已提交
2238 2239 2240 2241 2242

	if (skb_rx_queue_recorded(skb)) {
		u16 index = skb_get_rx_queue(skb);
		if (unlikely(index >= dev->num_rx_queues)) {
			if (net_ratelimit()) {
E
Eric Dumazet 已提交
2243 2244 2245
				pr_warning("%s received packet on queue "
					"%u, but number of RX queues is %u\n",
					dev->name, index, dev->num_rx_queues);
T
Tom Herbert 已提交
2246 2247 2248 2249 2250 2251 2252
			}
			goto done;
		}
		rxqueue = dev->_rx + index;
	} else
		rxqueue = dev->_rx;

T
Tom Herbert 已提交
2253
	if (!rxqueue->rps_map && !rxqueue->rps_flow_table)
T
Tom Herbert 已提交
2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265
		goto done;

	if (skb->rxhash)
		goto got_hash; /* Skip hash computation on packet header */

	switch (skb->protocol) {
	case __constant_htons(ETH_P_IP):
		if (!pskb_may_pull(skb, sizeof(*ip)))
			goto done;

		ip = (struct iphdr *) skb->data;
		ip_proto = ip->protocol;
E
Eric Dumazet 已提交
2266 2267
		addr1 = (__force u32) ip->saddr;
		addr2 = (__force u32) ip->daddr;
T
Tom Herbert 已提交
2268 2269 2270 2271 2272 2273 2274 2275
		ihl = ip->ihl;
		break;
	case __constant_htons(ETH_P_IPV6):
		if (!pskb_may_pull(skb, sizeof(*ip6)))
			goto done;

		ip6 = (struct ipv6hdr *) skb->data;
		ip_proto = ip6->nexthdr;
E
Eric Dumazet 已提交
2276 2277
		addr1 = (__force u32) ip6->saddr.s6_addr32[3];
		addr2 = (__force u32) ip6->daddr.s6_addr32[3];
T
Tom Herbert 已提交
2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290
		ihl = (40 >> 2);
		break;
	default:
		goto done;
	}
	switch (ip_proto) {
	case IPPROTO_TCP:
	case IPPROTO_UDP:
	case IPPROTO_DCCP:
	case IPPROTO_ESP:
	case IPPROTO_AH:
	case IPPROTO_SCTP:
	case IPPROTO_UDPLITE:
E
Eric Dumazet 已提交
2291
		if (pskb_may_pull(skb, (ihl * 4) + 4)) {
C
Changli Gao 已提交
2292 2293 2294 2295
			ports.v32 = * (__force u32 *) (skb->data + (ihl * 4));
			if (ports.v16[1] < ports.v16[0])
				swap(ports.v16[0], ports.v16[1]);
			break;
E
Eric Dumazet 已提交
2296
		}
T
Tom Herbert 已提交
2297
	default:
C
Changli Gao 已提交
2298
		ports.v32 = 0;
T
Tom Herbert 已提交
2299 2300 2301
		break;
	}

E
Eric Dumazet 已提交
2302 2303 2304
	/* get a consistent hash (same value on both flow directions) */
	if (addr2 < addr1)
		swap(addr1, addr2);
C
Changli Gao 已提交
2305
	skb->rxhash = jhash_3words(addr1, addr2, ports.v32, hashrnd);
T
Tom Herbert 已提交
2306 2307 2308 2309
	if (!skb->rxhash)
		skb->rxhash = 1;

got_hash:
T
Tom Herbert 已提交
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 2341 2342 2343 2344 2345 2346 2347 2348
	flow_table = rcu_dereference(rxqueue->rps_flow_table);
	sock_flow_table = rcu_dereference(rps_sock_flow_table);
	if (flow_table && sock_flow_table) {
		u16 next_cpu;
		struct rps_dev_flow *rflow;

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

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

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

T
Tom Herbert 已提交
2349 2350
	map = rcu_dereference(rxqueue->rps_map);
	if (map) {
T
Tom Herbert 已提交
2351
		tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32];
T
Tom Herbert 已提交
2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363

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

done:
	return cpu;
}

/* Called from hardirq (IPI) context */
E
Eric Dumazet 已提交
2364
static void rps_trigger_softirq(void *data)
T
Tom Herbert 已提交
2365
{
E
Eric Dumazet 已提交
2366 2367 2368
	struct softnet_data *sd = data;

	__napi_schedule(&sd->backlog);
T
Tom Herbert 已提交
2369 2370
	__get_cpu_var(netdev_rx_stat).received_rps++;
}
E
Eric Dumazet 已提交
2371

T
Tom Herbert 已提交
2372
#endif /* CONFIG_RPS */
T
Tom Herbert 已提交
2373

E
Eric Dumazet 已提交
2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394
/*
 * Check if this softnet_data structure is another cpu one
 * If yes, queue it to our IPI list and return 1
 * If no, return 0
 */
static int rps_ipi_queued(struct softnet_data *sd)
{
#ifdef CONFIG_RPS
	struct softnet_data *mysd = &__get_cpu_var(softnet_data);

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

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

T
Tom Herbert 已提交
2395 2396 2397 2398
/*
 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
 * queue (may be a remote CPU queue).
 */
T
Tom Herbert 已提交
2399 2400
static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
			      unsigned int *qtail)
T
Tom Herbert 已提交
2401
{
E
Eric Dumazet 已提交
2402
	struct softnet_data *sd;
T
Tom Herbert 已提交
2403 2404
	unsigned long flags;

E
Eric Dumazet 已提交
2405
	sd = &per_cpu(softnet_data, cpu);
T
Tom Herbert 已提交
2406 2407 2408 2409

	local_irq_save(flags);
	__get_cpu_var(netdev_rx_stat).total++;

E
Eric Dumazet 已提交
2410
	rps_lock(sd);
2411 2412
	if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) {
		if (skb_queue_len(&sd->input_pkt_queue)) {
T
Tom Herbert 已提交
2413
enqueue:
E
Eric Dumazet 已提交
2414
			__skb_queue_tail(&sd->input_pkt_queue, skb);
T
Tom Herbert 已提交
2415
#ifdef CONFIG_RPS
2416 2417
			*qtail = sd->input_queue_head +
					skb_queue_len(&sd->input_pkt_queue);
T
Tom Herbert 已提交
2418
#endif
E
Eric Dumazet 已提交
2419
			rps_unlock(sd);
2420
			local_irq_restore(flags);
T
Tom Herbert 已提交
2421 2422 2423 2424
			return NET_RX_SUCCESS;
		}

		/* Schedule NAPI for backlog device */
E
Eric Dumazet 已提交
2425 2426 2427
		if (napi_schedule_prep(&sd->backlog)) {
			if (!rps_ipi_queued(sd))
				__napi_schedule(&sd->backlog);
T
Tom Herbert 已提交
2428 2429 2430 2431
		}
		goto enqueue;
	}

E
Eric Dumazet 已提交
2432
	rps_unlock(sd);
T
Tom Herbert 已提交
2433 2434 2435 2436 2437 2438 2439

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

	kfree_skb(skb);
	return NET_RX_DROP;
}
L
Linus Torvalds 已提交
2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457

/**
 *	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)
{
2458
	int ret;
L
Linus Torvalds 已提交
2459 2460 2461 2462 2463

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

2464
	if (!skb->tstamp.tv64)
2465
		net_timestamp(skb);
L
Linus Torvalds 已提交
2466

E
Eric Dumazet 已提交
2467
#ifdef CONFIG_RPS
2468
	{
T
Tom Herbert 已提交
2469
		struct rps_dev_flow voidflow, *rflow = &voidflow;
2470 2471 2472
		int cpu;

		rcu_read_lock();
T
Tom Herbert 已提交
2473 2474

		cpu = get_rps_cpu(skb->dev, skb, &rflow);
2475 2476
		if (cpu < 0)
			cpu = smp_processor_id();
T
Tom Herbert 已提交
2477 2478 2479

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

2480 2481
		rcu_read_unlock();
	}
2482
#else
T
Tom Herbert 已提交
2483 2484 2485 2486 2487
	{
		unsigned int qtail;
		ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
		put_cpu();
	}
2488
#endif
2489
	return ret;
L
Linus Torvalds 已提交
2490
}
E
Eric Dumazet 已提交
2491
EXPORT_SYMBOL(netif_rx);
L
Linus Torvalds 已提交
2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522

int netif_rx_ni(struct sk_buff *skb)
{
	int err;

	preempt_disable();
	err = netif_rx(skb);
	if (local_softirq_pending())
		do_softirq();
	preempt_enable();

	return err;
}
EXPORT_SYMBOL(netif_rx_ni);

static void net_tx_action(struct softirq_action *h)
{
	struct softnet_data *sd = &__get_cpu_var(softnet_data);

	if (sd->completion_queue) {
		struct sk_buff *clist;

		local_irq_disable();
		clist = sd->completion_queue;
		sd->completion_queue = NULL;
		local_irq_enable();

		while (clist) {
			struct sk_buff *skb = clist;
			clist = clist->next;

2523
			WARN_ON(atomic_read(&skb->users));
L
Linus Torvalds 已提交
2524 2525 2526 2527 2528
			__kfree_skb(skb);
		}
	}

	if (sd->output_queue) {
2529
		struct Qdisc *head;
L
Linus Torvalds 已提交
2530 2531 2532 2533

		local_irq_disable();
		head = sd->output_queue;
		sd->output_queue = NULL;
2534
		sd->output_queue_tailp = &sd->output_queue;
L
Linus Torvalds 已提交
2535 2536 2537
		local_irq_enable();

		while (head) {
2538 2539 2540
			struct Qdisc *q = head;
			spinlock_t *root_lock;

L
Linus Torvalds 已提交
2541 2542
			head = head->next_sched;

2543
			root_lock = qdisc_lock(q);
2544
			if (spin_trylock(root_lock)) {
2545 2546 2547
				smp_mb__before_clear_bit();
				clear_bit(__QDISC_STATE_SCHED,
					  &q->state);
2548 2549
				qdisc_run(q);
				spin_unlock(root_lock);
L
Linus Torvalds 已提交
2550
			} else {
2551
				if (!test_bit(__QDISC_STATE_DEACTIVATED,
2552
					      &q->state)) {
2553
					__netif_reschedule(q);
2554 2555 2556 2557 2558
				} else {
					smp_mb__before_clear_bit();
					clear_bit(__QDISC_STATE_SCHED,
						  &q->state);
				}
L
Linus Torvalds 已提交
2559 2560 2561 2562 2563
			}
		}
	}
}

2564 2565 2566
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
2567 2568
{
	atomic_inc(&skb->users);
D
David S. Miller 已提交
2569
	return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2570 2571 2572
}

#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2573 2574 2575 2576 2577

#if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
/* This hook is defined here for ATM LANE */
int (*br_fdb_test_addr_hook)(struct net_device *dev,
			     unsigned char *addr) __read_mostly;
2578
EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
2579
#endif
L
Linus Torvalds 已提交
2580

2581 2582 2583 2584 2585 2586
/*
 * 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;
2587
EXPORT_SYMBOL_GPL(br_handle_frame_hook);
2588

2589 2590 2591
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
2592 2593 2594
{
	struct net_bridge_port *port;

2595 2596 2597
	if (skb->pkt_type == PACKET_LOOPBACK ||
	    (port = rcu_dereference(skb->dev->br_port)) == NULL)
		return skb;
L
Linus Torvalds 已提交
2598 2599

	if (*pt_prev) {
2600
		*ret = deliver_skb(skb, *pt_prev, orig_dev);
L
Linus Torvalds 已提交
2601
		*pt_prev = NULL;
2602 2603
	}

2604
	return br_handle_frame_hook(port, skb);
L
Linus Torvalds 已提交
2605 2606
}
#else
2607
#define handle_bridge(skb, pt_prev, ret, orig_dev)	(skb)
L
Linus Torvalds 已提交
2608 2609
#endif

P
Patrick McHardy 已提交
2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631
#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
2632 2633 2634 2635 2636
#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
2637
 * NOTE: This doesnt stop any functionality; if you dont have
L
Linus Torvalds 已提交
2638 2639 2640
 * the ingress scheduler, you just cant add policies on ingress.
 *
 */
2641
static int ing_filter(struct sk_buff *skb)
L
Linus Torvalds 已提交
2642 2643
{
	struct net_device *dev = skb->dev;
2644
	u32 ttl = G_TC_RTTL(skb->tc_verd);
2645 2646 2647
	struct netdev_queue *rxq;
	int result = TC_ACT_OK;
	struct Qdisc *q;
2648

2649 2650 2651
	if (MAX_RED_LOOP < ttl++) {
		printk(KERN_WARNING
		       "Redir loop detected Dropping packet (%d->%d)\n",
2652
		       skb->skb_iif, dev->ifindex);
2653 2654
		return TC_ACT_SHOT;
	}
L
Linus Torvalds 已提交
2655

2656 2657
	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
2658

2659 2660
	rxq = &dev->rx_queue;

2661
	q = rxq->qdisc;
2662
	if (q != &noop_qdisc) {
2663
		spin_lock(qdisc_lock(q));
2664 2665
		if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
			result = qdisc_enqueue_root(skb, q);
2666 2667
		spin_unlock(qdisc_lock(q));
	}
2668 2669 2670

	return result;
}
2671

2672 2673 2674 2675
static inline struct sk_buff *handle_ing(struct sk_buff *skb,
					 struct packet_type **pt_prev,
					 int *ret, struct net_device *orig_dev)
{
2676
	if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2677
		goto out;
L
Linus Torvalds 已提交
2678

2679 2680 2681 2682 2683 2684
	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
2685 2686
	}

2687 2688 2689 2690 2691 2692 2693 2694 2695 2696
	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
2697 2698 2699
}
#endif

2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726
/*
 * 	netif_nit_deliver - deliver received packets to network taps
 * 	@skb: buffer
 *
 * 	This function is used to deliver incoming packets to network
 * 	taps. It should be used when the normal netif_receive_skb path
 * 	is bypassed, for example because of VLAN acceleration.
 */
void netif_nit_deliver(struct sk_buff *skb)
{
	struct packet_type *ptype;

	if (list_empty(&ptype_all))
		return;

	skb_reset_network_header(skb);
	skb_reset_transport_header(skb);
	skb->mac_len = skb->network_header - skb->mac_header;

	rcu_read_lock();
	list_for_each_entry_rcu(ptype, &ptype_all, list) {
		if (!ptype->dev || ptype->dev == skb->dev)
			deliver_skb(skb, ptype, skb->dev);
	}
	rcu_read_unlock();
}

2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775
static inline void skb_bond_set_mac_by_master(struct sk_buff *skb,
					      struct net_device *master)
{
	if (skb->pkt_type == PACKET_HOST) {
		u16 *dest = (u16 *) eth_hdr(skb)->h_dest;

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

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

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

	if ((master->priv_flags & IFF_MASTER_ALB) && master->br_port) {
		/* Do address unmangle. The local destination address
		 * will be always the one master has. Provides the right
		 * functionality in a bridge.
		 */
		skb_bond_set_mac_by_master(skb, master);
	}

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

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

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

2776
static int __netif_receive_skb(struct sk_buff *skb)
L
Linus Torvalds 已提交
2777 2778
{
	struct packet_type *ptype, *pt_prev;
D
David S. Miller 已提交
2779
	struct net_device *orig_dev;
2780
	struct net_device *master;
2781
	struct net_device *null_or_orig;
2782
	struct net_device *null_or_bond;
L
Linus Torvalds 已提交
2783
	int ret = NET_RX_DROP;
A
Al Viro 已提交
2784
	__be16 type;
L
Linus Torvalds 已提交
2785

2786 2787 2788
	if (!skb->tstamp.tv64)
		net_timestamp(skb);

E
Eric Dumazet 已提交
2789
	if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb))
2790 2791
		return NET_RX_SUCCESS;

L
Linus Torvalds 已提交
2792
	/* if we've gotten here through NAPI, check netpoll */
2793
	if (netpoll_receive_skb(skb))
L
Linus Torvalds 已提交
2794 2795
		return NET_RX_DROP;

2796 2797
	if (!skb->skb_iif)
		skb->skb_iif = skb->dev->ifindex;
2798

2799
	null_or_orig = NULL;
J
Joe Eykholt 已提交
2800
	orig_dev = skb->dev;
2801 2802 2803
	master = ACCESS_ONCE(orig_dev->master);
	if (master) {
		if (skb_bond_should_drop(skb, master))
2804 2805
			null_or_orig = orig_dev; /* deliver only exact match */
		else
2806
			skb->dev = master;
J
Joe Eykholt 已提交
2807
	}
2808

L
Linus Torvalds 已提交
2809 2810
	__get_cpu_var(netdev_rx_stat).total++;

2811
	skb_reset_network_header(skb);
2812
	skb_reset_transport_header(skb);
2813
	skb->mac_len = skb->network_header - skb->mac_header;
L
Linus Torvalds 已提交
2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826

	pt_prev = NULL;

	rcu_read_lock();

#ifdef CONFIG_NET_CLS_ACT
	if (skb->tc_verd & TC_NCLS) {
		skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
		goto ncls;
	}
#endif

	list_for_each_entry_rcu(ptype, &ptype_all, list) {
2827 2828
		if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
		    ptype->dev == orig_dev) {
2829
			if (pt_prev)
D
David S. Miller 已提交
2830
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2831 2832 2833 2834 2835
			pt_prev = ptype;
		}
	}

#ifdef CONFIG_NET_CLS_ACT
2836 2837
	skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
	if (!skb)
L
Linus Torvalds 已提交
2838 2839 2840 2841
		goto out;
ncls:
#endif

2842
	skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
P
Patrick McHardy 已提交
2843 2844 2845
	if (!skb)
		goto out;
	skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2846
	if (!skb)
L
Linus Torvalds 已提交
2847 2848
		goto out;

2849 2850 2851 2852 2853 2854
	/*
	 * Make sure frames received on VLAN interfaces stacked on
	 * bonding interfaces still make their way to any base bonding
	 * device that may have registered for a specific ptype.  The
	 * handler may have to adjust skb->dev and orig_dev.
	 */
2855
	null_or_bond = NULL;
2856 2857
	if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) &&
	    (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) {
2858
		null_or_bond = vlan_dev_real_dev(skb->dev);
2859 2860
	}

L
Linus Torvalds 已提交
2861
	type = skb->protocol;
2862 2863
	list_for_each_entry_rcu(ptype,
			&ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2864
		if (ptype->type == type && (ptype->dev == null_or_orig ||
2865 2866
		     ptype->dev == skb->dev || ptype->dev == orig_dev ||
		     ptype->dev == null_or_bond)) {
2867
			if (pt_prev)
D
David S. Miller 已提交
2868
				ret = deliver_skb(skb, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2869 2870 2871 2872 2873
			pt_prev = ptype;
		}
	}

	if (pt_prev) {
D
David S. Miller 已提交
2874
		ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
L
Linus Torvalds 已提交
2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886
	} 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;
}
T
Tom Herbert 已提交
2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904

/**
 *	netif_receive_skb - process receive buffer from network
 *	@skb: buffer to process
 *
 *	netif_receive_skb() is the main receive data processing function.
 *	It always succeeds. The buffer may be dropped during processing
 *	for congestion control or by the protocol layers.
 *
 *	This function may only be called from softirq context and interrupts
 *	should be enabled.
 *
 *	Return values (usually ignored):
 *	NET_RX_SUCCESS: no congestion
 *	NET_RX_DROP: packet was dropped
 */
int netif_receive_skb(struct sk_buff *skb)
{
E
Eric Dumazet 已提交
2905
#ifdef CONFIG_RPS
T
Tom Herbert 已提交
2906 2907 2908 2909
	struct rps_dev_flow voidflow, *rflow = &voidflow;
	int cpu, ret;

	rcu_read_lock();
T
Tom Herbert 已提交
2910

T
Tom Herbert 已提交
2911
	cpu = get_rps_cpu(skb->dev, skb, &rflow);
T
Tom Herbert 已提交
2912

T
Tom Herbert 已提交
2913 2914 2915 2916 2917 2918 2919 2920 2921
	if (cpu >= 0) {
		ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
		rcu_read_unlock();
	} else {
		rcu_read_unlock();
		ret = __netif_receive_skb(skb);
	}

	return ret;
2922 2923 2924
#else
	return __netif_receive_skb(skb);
#endif
T
Tom Herbert 已提交
2925
}
E
Eric Dumazet 已提交
2926
EXPORT_SYMBOL(netif_receive_skb);
L
Linus Torvalds 已提交
2927

E
Eric Dumazet 已提交
2928 2929 2930
/* Network device is going away, flush any packets still pending
 * Called with irqs disabled.
 */
2931
static void flush_backlog(void *arg)
2932
{
2933
	struct net_device *dev = arg;
E
Eric Dumazet 已提交
2934
	struct softnet_data *sd = &__get_cpu_var(softnet_data);
2935 2936
	struct sk_buff *skb, *tmp;

E
Eric Dumazet 已提交
2937
	rps_lock(sd);
2938
	skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
2939
		if (skb->dev == dev) {
E
Eric Dumazet 已提交
2940
			__skb_unlink(skb, &sd->input_pkt_queue);
2941
			kfree_skb(skb);
2942
			input_queue_head_add(sd, 1);
2943
		}
2944
	}
E
Eric Dumazet 已提交
2945
	rps_unlock(sd);
2946 2947 2948 2949 2950 2951 2952

	skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
		if (skb->dev == dev) {
			__skb_unlink(skb, &sd->process_queue);
			kfree_skb(skb);
		}
	}
2953 2954
}

2955 2956 2957 2958 2959 2960 2961
static int napi_gro_complete(struct sk_buff *skb)
{
	struct packet_type *ptype;
	__be16 type = skb->protocol;
	struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
	int err = -ENOENT;

2962 2963
	if (NAPI_GRO_CB(skb)->count == 1) {
		skb_shinfo(skb)->gso_size = 0;
2964
		goto out;
2965
	}
2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986

	rcu_read_lock();
	list_for_each_entry_rcu(ptype, head, list) {
		if (ptype->type != type || ptype->dev || !ptype->gro_complete)
			continue;

		err = ptype->gro_complete(skb);
		break;
	}
	rcu_read_unlock();

	if (err) {
		WARN_ON(&ptype->list == head);
		kfree_skb(skb);
		return NET_RX_SUCCESS;
	}

out:
	return netif_receive_skb(skb);
}

2987
static void napi_gro_flush(struct napi_struct *napi)
2988 2989 2990 2991 2992 2993 2994 2995 2996
{
	struct sk_buff *skb, *next;

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

2997
	napi->gro_count = 0;
2998 2999 3000
	napi->gro_list = NULL;
}

3001
enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3002 3003 3004 3005 3006
{
	struct sk_buff **pp = NULL;
	struct packet_type *ptype;
	__be16 type = skb->protocol;
	struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
H
Herbert Xu 已提交
3007
	int same_flow;
3008
	int mac_len;
3009
	enum gro_result ret;
3010 3011 3012 3013

	if (!(skb->dev->features & NETIF_F_GRO))
		goto normal;

3014
	if (skb_is_gso(skb) || skb_has_frags(skb))
3015 3016
		goto normal;

3017 3018 3019 3020 3021
	rcu_read_lock();
	list_for_each_entry_rcu(ptype, head, list) {
		if (ptype->type != type || ptype->dev || !ptype->gro_receive)
			continue;

3022
		skb_set_network_header(skb, skb_gro_offset(skb));
3023 3024 3025 3026
		mac_len = skb->network_header - skb->mac_header;
		skb->mac_len = mac_len;
		NAPI_GRO_CB(skb)->same_flow = 0;
		NAPI_GRO_CB(skb)->flush = 0;
H
Herbert Xu 已提交
3027
		NAPI_GRO_CB(skb)->free = 0;
3028 3029 3030 3031 3032 3033 3034 3035 3036

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

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

H
Herbert Xu 已提交
3037
	same_flow = NAPI_GRO_CB(skb)->same_flow;
3038
	ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
H
Herbert Xu 已提交
3039

3040 3041 3042 3043 3044 3045
	if (pp) {
		struct sk_buff *nskb = *pp;

		*pp = nskb->next;
		nskb->next = NULL;
		napi_gro_complete(nskb);
3046
		napi->gro_count--;
3047 3048
	}

H
Herbert Xu 已提交
3049
	if (same_flow)
3050 3051
		goto ok;

3052
	if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
3053 3054
		goto normal;

3055
	napi->gro_count++;
3056
	NAPI_GRO_CB(skb)->count = 1;
3057
	skb_shinfo(skb)->gso_size = skb_gro_len(skb);
3058 3059
	skb->next = napi->gro_list;
	napi->gro_list = skb;
3060
	ret = GRO_HELD;
3061

3062
pull:
H
Herbert Xu 已提交
3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081
	if (skb_headlen(skb) < skb_gro_offset(skb)) {
		int grow = skb_gro_offset(skb) - skb_headlen(skb);

		BUG_ON(skb->end - skb->tail < grow);

		memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);

		skb->tail += grow;
		skb->data_len -= grow;

		skb_shinfo(skb)->frags[0].page_offset += grow;
		skb_shinfo(skb)->frags[0].size -= grow;

		if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
			put_page(skb_shinfo(skb)->frags[0].page);
			memmove(skb_shinfo(skb)->frags,
				skb_shinfo(skb)->frags + 1,
				--skb_shinfo(skb)->nr_frags);
		}
3082 3083
	}

3084
ok:
3085
	return ret;
3086 3087

normal:
3088 3089
	ret = GRO_NORMAL;
	goto pull;
H
Herbert Xu 已提交
3090
}
3091 3092
EXPORT_SYMBOL(dev_gro_receive);

3093 3094
static gro_result_t
__napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3095 3096 3097
{
	struct sk_buff *p;

3098 3099 3100
	if (netpoll_rx_on(skb))
		return GRO_NORMAL;

3101
	for (p = napi->gro_list; p; p = p->next) {
3102 3103 3104 3105
		NAPI_GRO_CB(p)->same_flow =
			(p->dev == skb->dev) &&
			!compare_ether_header(skb_mac_header(p),
					      skb_gro_mac_header(skb));
3106 3107 3108 3109 3110
		NAPI_GRO_CB(p)->flush = 0;
	}

	return dev_gro_receive(napi, skb);
}
H
Herbert Xu 已提交
3111

3112
gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
H
Herbert Xu 已提交
3113
{
3114 3115
	switch (ret) {
	case GRO_NORMAL:
3116 3117 3118
		if (netif_receive_skb(skb))
			ret = GRO_DROP;
		break;
H
Herbert Xu 已提交
3119

3120 3121
	case GRO_DROP:
	case GRO_MERGED_FREE:
H
Herbert Xu 已提交
3122 3123
		kfree_skb(skb);
		break;
3124 3125 3126 3127

	case GRO_HELD:
	case GRO_MERGED:
		break;
H
Herbert Xu 已提交
3128 3129
	}

3130
	return ret;
3131 3132 3133
}
EXPORT_SYMBOL(napi_skb_finish);

3134 3135 3136 3137
void skb_gro_reset_offset(struct sk_buff *skb)
{
	NAPI_GRO_CB(skb)->data_offset = 0;
	NAPI_GRO_CB(skb)->frag0 = NULL;
3138
	NAPI_GRO_CB(skb)->frag0_len = 0;
3139

3140
	if (skb->mac_header == skb->tail &&
3141
	    !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
3142 3143 3144
		NAPI_GRO_CB(skb)->frag0 =
			page_address(skb_shinfo(skb)->frags[0].page) +
			skb_shinfo(skb)->frags[0].page_offset;
3145 3146
		NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
	}
3147 3148 3149
}
EXPORT_SYMBOL(skb_gro_reset_offset);

3150
gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
3151
{
3152 3153
	skb_gro_reset_offset(skb);

3154
	return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
3155 3156 3157
}
EXPORT_SYMBOL(napi_gro_receive);

3158 3159 3160 3161 3162 3163 3164 3165 3166
void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
{
	__skb_pull(skb, skb_headlen(skb));
	skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));

	napi->skb = skb;
}
EXPORT_SYMBOL(napi_reuse_skb);

3167
struct sk_buff *napi_get_frags(struct napi_struct *napi)
H
Herbert Xu 已提交
3168 3169 3170 3171
{
	struct sk_buff *skb = napi->skb;

	if (!skb) {
3172 3173 3174
		skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD);
		if (skb)
			napi->skb = skb;
3175
	}
3176 3177
	return skb;
}
3178
EXPORT_SYMBOL(napi_get_frags);
3179

3180 3181
gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb,
			       gro_result_t ret)
3182
{
3183 3184
	switch (ret) {
	case GRO_NORMAL:
3185
	case GRO_HELD:
3186
		skb->protocol = eth_type_trans(skb, skb->dev);
3187

3188 3189 3190 3191
		if (ret == GRO_HELD)
			skb_gro_pull(skb, -ETH_HLEN);
		else if (netif_receive_skb(skb))
			ret = GRO_DROP;
3192
		break;
H
Herbert Xu 已提交
3193

3194 3195 3196 3197
	case GRO_DROP:
	case GRO_MERGED_FREE:
		napi_reuse_skb(napi, skb);
		break;
3198 3199 3200

	case GRO_MERGED:
		break;
3201
	}
H
Herbert Xu 已提交
3202

3203
	return ret;
H
Herbert Xu 已提交
3204
}
3205 3206
EXPORT_SYMBOL(napi_frags_finish);

3207 3208 3209 3210
struct sk_buff *napi_frags_skb(struct napi_struct *napi)
{
	struct sk_buff *skb = napi->skb;
	struct ethhdr *eth;
3211 3212
	unsigned int hlen;
	unsigned int off;
3213 3214 3215 3216 3217 3218

	napi->skb = NULL;

	skb_reset_mac_header(skb);
	skb_gro_reset_offset(skb);

3219 3220 3221 3222 3223 3224 3225 3226 3227 3228
	off = skb_gro_offset(skb);
	hlen = off + sizeof(*eth);
	eth = skb_gro_header_fast(skb, off);
	if (skb_gro_header_hard(skb, hlen)) {
		eth = skb_gro_header_slow(skb, hlen, off);
		if (unlikely(!eth)) {
			napi_reuse_skb(napi, skb);
			skb = NULL;
			goto out;
		}
3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243
	}

	skb_gro_pull(skb, sizeof(*eth));

	/*
	 * This works because the only protocols we care about don't require
	 * special handling.  We'll fix it up properly at the end.
	 */
	skb->protocol = eth->h_proto;

out:
	return skb;
}
EXPORT_SYMBOL(napi_frags_skb);

3244
gro_result_t napi_gro_frags(struct napi_struct *napi)
3245
{
3246
	struct sk_buff *skb = napi_frags_skb(napi);
3247 3248

	if (!skb)
3249
		return GRO_DROP;
3250 3251 3252

	return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
}
H
Herbert Xu 已提交
3253 3254
EXPORT_SYMBOL(napi_gro_frags);

3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282
/*
 * net_rps_action sends any pending IPI's for rps.
 * Note: called with local irq disabled, but exits with local irq enabled.
 */
static void net_rps_action_and_irq_enable(struct softnet_data *sd)
{
#ifdef CONFIG_RPS
	struct softnet_data *remsd = sd->rps_ipi_list;

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

		local_irq_enable();

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

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

3283
static int process_backlog(struct napi_struct *napi, int quota)
L
Linus Torvalds 已提交
3284 3285
{
	int work = 0;
E
Eric Dumazet 已提交
3286
	struct softnet_data *sd = &__get_cpu_var(softnet_data);
L
Linus Torvalds 已提交
3287

3288 3289 3290 3291 3292 3293 3294 3295 3296
#ifdef CONFIG_RPS
	/* Check if we have pending ipi, its better to send them now,
	 * not waiting net_rx_action() end.
	 */
	if (sd->rps_ipi_list) {
		local_irq_disable();
		net_rps_action_and_irq_enable(sd);
	}
#endif
3297
	napi->weight = weight_p;
3298 3299
	local_irq_disable();
	while (work < quota) {
L
Linus Torvalds 已提交
3300
		struct sk_buff *skb;
3301 3302 3303 3304 3305 3306 3307 3308 3309
		unsigned int qlen;

		while ((skb = __skb_dequeue(&sd->process_queue))) {
			local_irq_enable();
			__netif_receive_skb(skb);
			if (++work >= quota)
				return work;
			local_irq_disable();
		}
L
Linus Torvalds 已提交
3310

E
Eric Dumazet 已提交
3311
		rps_lock(sd);
3312 3313 3314 3315 3316 3317 3318
		qlen = skb_queue_len(&sd->input_pkt_queue);
		if (qlen) {
			input_queue_head_add(sd, qlen);
			skb_queue_splice_tail_init(&sd->input_pkt_queue,
						   &sd->process_queue);
		}
		if (qlen < quota - work) {
3319
			__napi_complete(napi);
3320
			quota = work + qlen;
3321
		}
E
Eric Dumazet 已提交
3322
		rps_unlock(sd);
3323 3324
	}
	local_irq_enable();
L
Linus Torvalds 已提交
3325

3326 3327
	return work;
}
L
Linus Torvalds 已提交
3328

3329 3330
/**
 * __napi_schedule - schedule for receive
3331
 * @n: entry to schedule
3332 3333 3334
 *
 * The entry's receive function will be scheduled to run
 */
H
Harvey Harrison 已提交
3335
void __napi_schedule(struct napi_struct *n)
3336 3337
{
	unsigned long flags;
L
Linus Torvalds 已提交
3338

3339 3340 3341 3342
	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
3343
}
3344 3345
EXPORT_SYMBOL(__napi_schedule);

3346 3347 3348 3349 3350 3351 3352 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
void __napi_complete(struct napi_struct *n)
{
	BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
	BUG_ON(n->gro_list);

	list_del(&n->poll_list);
	smp_mb__before_clear_bit();
	clear_bit(NAPI_STATE_SCHED, &n->state);
}
EXPORT_SYMBOL(__napi_complete);

void napi_complete(struct napi_struct *n)
{
	unsigned long flags;

	/*
	 * don't let napi dequeue from the cpu poll list
	 * just in case its running on a different cpu
	 */
	if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
		return;

	napi_gro_flush(n);
	local_irq_save(flags);
	__napi_complete(n);
	local_irq_restore(flags);
}
EXPORT_SYMBOL(napi_complete);

void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
		    int (*poll)(struct napi_struct *, int), int weight)
{
	INIT_LIST_HEAD(&napi->poll_list);
3379
	napi->gro_count = 0;
3380
	napi->gro_list = NULL;
H
Herbert Xu 已提交
3381
	napi->skb = NULL;
3382 3383 3384 3385
	napi->poll = poll;
	napi->weight = weight;
	list_add(&napi->dev_list, &dev->napi_list);
	napi->dev = dev;
H
Herbert Xu 已提交
3386
#ifdef CONFIG_NETPOLL
3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397
	spin_lock_init(&napi->poll_lock);
	napi->poll_owner = -1;
#endif
	set_bit(NAPI_STATE_SCHED, &napi->state);
}
EXPORT_SYMBOL(netif_napi_add);

void netif_napi_del(struct napi_struct *napi)
{
	struct sk_buff *skb, *next;

3398
	list_del_init(&napi->dev_list);
3399
	napi_free_frags(napi);
3400 3401 3402 3403 3404 3405 3406 3407

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

	napi->gro_list = NULL;
3408
	napi->gro_count = 0;
3409 3410 3411
}
EXPORT_SYMBOL(netif_napi_del);

L
Linus Torvalds 已提交
3412 3413
static void net_rx_action(struct softirq_action *h)
{
3414
	struct softnet_data *sd = &__get_cpu_var(softnet_data);
3415
	unsigned long time_limit = jiffies + 2;
3416
	int budget = netdev_budget;
3417 3418
	void *have;

L
Linus Torvalds 已提交
3419 3420
	local_irq_disable();

3421
	while (!list_empty(&sd->poll_list)) {
3422 3423
		struct napi_struct *n;
		int work, weight;
L
Linus Torvalds 已提交
3424

3425
		/* If softirq window is exhuasted then punt.
3426 3427
		 * Allow this to run for 2 jiffies since which will allow
		 * an average latency of 1.5/HZ.
3428
		 */
3429
		if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
L
Linus Torvalds 已提交
3430 3431 3432 3433
			goto softnet_break;

		local_irq_enable();

3434 3435 3436 3437 3438
		/* 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.
		 */
3439
		n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list);
L
Linus Torvalds 已提交
3440

3441 3442 3443 3444
		have = netpoll_poll_lock(n);

		weight = n->weight;

3445 3446 3447 3448 3449 3450 3451
		/* 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;
3452
		if (test_bit(NAPI_STATE_SCHED, &n->state)) {
3453
			work = n->poll(n, weight);
3454 3455
			trace_napi_poll(n);
		}
3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467

		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.
		 */
3468
		if (unlikely(work == weight)) {
3469 3470 3471 3472 3473
			if (unlikely(napi_disable_pending(n))) {
				local_irq_enable();
				napi_complete(n);
				local_irq_disable();
			} else
3474
				list_move_tail(&n->poll_list, &sd->poll_list);
3475
		}
3476 3477

		netpoll_poll_unlock(have);
L
Linus Torvalds 已提交
3478 3479
	}
out:
3480
	net_rps_action_and_irq_enable(sd);
T
Tom Herbert 已提交
3481

3482 3483 3484 3485 3486
#ifdef CONFIG_NET_DMA
	/*
	 * There may not be any more sk_buffs coming right now, so push
	 * any pending DMA copies to hardware
	 */
3487
	dma_issue_pending_all();
3488
#endif
3489

L
Linus Torvalds 已提交
3490 3491 3492 3493 3494 3495 3496 3497
	return;

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

E
Eric Dumazet 已提交
3498
static gifconf_func_t *gifconf_list[NPROTO];
L
Linus Torvalds 已提交
3499 3500 3501 3502 3503 3504 3505 3506 3507 3508

/**
 *	register_gifconf	-	register a SIOCGIF handler
 *	@family: Address family
 *	@gifconf: Function handler
 *
 *	Register protocol dependent address dumping routines. The handler
 *	that is passed must not be freed or reused until it has been replaced
 *	by another handler.
 */
E
Eric Dumazet 已提交
3509
int register_gifconf(unsigned int family, gifconf_func_t *gifconf)
L
Linus Torvalds 已提交
3510 3511 3512 3513 3514 3515
{
	if (family >= NPROTO)
		return -EINVAL;
	gifconf_list[family] = gifconf;
	return 0;
}
E
Eric Dumazet 已提交
3516
EXPORT_SYMBOL(register_gifconf);
L
Linus Torvalds 已提交
3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529


/*
 *	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
 */

3530
static int dev_ifname(struct net *net, struct ifreq __user *arg)
L
Linus Torvalds 已提交
3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541
{
	struct net_device *dev;
	struct ifreq ifr;

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

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

3542 3543
	rcu_read_lock();
	dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex);
L
Linus Torvalds 已提交
3544
	if (!dev) {
3545
		rcu_read_unlock();
L
Linus Torvalds 已提交
3546 3547 3548 3549
		return -ENODEV;
	}

	strcpy(ifr.ifr_name, dev->name);
3550
	rcu_read_unlock();
L
Linus Torvalds 已提交
3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562

	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'.
 */

3563
static int dev_ifconf(struct net *net, char __user *arg)
L
Linus Torvalds 已提交
3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580 3581 3582 3583 3584 3585 3586
{
	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;
3587
	for_each_netdev(net, dev) {
L
Linus Torvalds 已提交
3588 3589 3590 3591 3592 3593 3594 3595 3596 3597 3598 3599 3600
		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;
			}
		}
3601
	}
L
Linus Torvalds 已提交
3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618

	/*
	 *	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.
 */
3619
void *dev_seq_start(struct seq_file *seq, loff_t *pos)
3620
	__acquires(RCU)
L
Linus Torvalds 已提交
3621
{
3622
	struct net *net = seq_file_net(seq);
3623
	loff_t off;
L
Linus Torvalds 已提交
3624 3625
	struct net_device *dev;

3626
	rcu_read_lock();
3627 3628
	if (!*pos)
		return SEQ_START_TOKEN;
L
Linus Torvalds 已提交
3629

3630
	off = 1;
3631
	for_each_netdev_rcu(net, dev)
3632 3633
		if (off++ == *pos)
			return dev;
L
Linus Torvalds 已提交
3634

3635
	return NULL;
L
Linus Torvalds 已提交
3636 3637 3638 3639
}

void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
3640 3641 3642 3643
	struct net_device *dev = (v == SEQ_START_TOKEN) ?
				  first_net_device(seq_file_net(seq)) :
				  next_net_device((struct net_device *)v);

L
Linus Torvalds 已提交
3644
	++*pos;
3645
	return rcu_dereference(dev);
L
Linus Torvalds 已提交
3646 3647 3648
}

void dev_seq_stop(struct seq_file *seq, void *v)
3649
	__releases(RCU)
L
Linus Torvalds 已提交
3650
{
3651
	rcu_read_unlock();
L
Linus Torvalds 已提交
3652 3653 3654 3655
}

static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
3656
	const struct net_device_stats *stats = dev_get_stats(dev);
L
Linus Torvalds 已提交
3657

3658
	seq_printf(seq, "%6s: %7lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3659 3660 3661 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674
		   "%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
Linus Torvalds 已提交
3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697
}

/*
 *	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;

3698
	while (*pos < nr_cpu_ids)
3699
		if (cpu_online(*pos)) {
L
Linus Torvalds 已提交
3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718 3719 3720 3721 3722 3723 3724 3725
			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;

T
Tom Herbert 已提交
3726
	seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3727
		   s->total, s->dropped, s->time_squeeze, 0,
3728
		   0, 0, 0, 0, /* was fastroute */
T
Tom Herbert 已提交
3729
		   s->cpu_collision, s->received_rps);
L
Linus Torvalds 已提交
3730 3731 3732
	return 0;
}

3733
static const struct seq_operations dev_seq_ops = {
L
Linus Torvalds 已提交
3734 3735 3736 3737 3738 3739 3740 3741
	.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)
{
3742 3743
	return seq_open_net(inode, file, &dev_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
3744 3745
}

3746
static const struct file_operations dev_seq_fops = {
L
Linus Torvalds 已提交
3747 3748 3749 3750
	.owner	 = THIS_MODULE,
	.open    = dev_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
3751
	.release = seq_release_net,
L
Linus Torvalds 已提交
3752 3753
};

3754
static const struct seq_operations softnet_seq_ops = {
L
Linus Torvalds 已提交
3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765
	.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);
}

3766
static const struct file_operations softnet_seq_fops = {
L
Linus Torvalds 已提交
3767 3768 3769 3770 3771 3772 3773
	.owner	 = THIS_MODULE,
	.open    = softnet_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release,
};

3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785
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;
	}

3786
	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3787 3788 3789 3790 3791 3792 3793 3794 3795 3796
		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)
3797
	__acquires(RCU)
3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820
{
	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
3821
		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3822 3823

	while (nxt == &ptype_base[hash]) {
3824
		if (++hash >= PTYPE_HASH_SIZE)
3825 3826 3827 3828 3829 3830 3831 3832
			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)
3833
	__releases(RCU)
3834 3835 3836 3837 3838 3839 3840 3841 3842 3843
{
	rcu_read_unlock();
}

static int ptype_seq_show(struct seq_file *seq, void *v)
{
	struct packet_type *pt = v;

	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "Type Device      Function\n");
3844
	else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3845 3846 3847 3848 3849
		if (pt->type == htons(ETH_P_ALL))
			seq_puts(seq, "ALL ");
		else
			seq_printf(seq, "%04x", ntohs(pt->type));

A
Alexey Dobriyan 已提交
3850 3851
		seq_printf(seq, " %-8s %pF\n",
			   pt->dev ? pt->dev->name : "", pt->func);
3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865
	}

	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)
{
3866 3867
	return seq_open_net(inode, file, &ptype_seq_ops,
			sizeof(struct seq_net_private));
3868 3869 3870 3871 3872 3873 3874
}

static const struct file_operations ptype_seq_fops = {
	.owner	 = THIS_MODULE,
	.open    = ptype_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
3875
	.release = seq_release_net,
3876 3877 3878
};


3879
static int __net_init dev_proc_net_init(struct net *net)
L
Linus Torvalds 已提交
3880 3881 3882
{
	int rc = -ENOMEM;

3883
	if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
L
Linus Torvalds 已提交
3884
		goto out;
3885
	if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
L
Linus Torvalds 已提交
3886
		goto out_dev;
3887
	if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3888
		goto out_softnet;
3889

3890
	if (wext_proc_init(net))
3891
		goto out_ptype;
L
Linus Torvalds 已提交
3892 3893 3894
	rc = 0;
out:
	return rc;
3895
out_ptype:
3896
	proc_net_remove(net, "ptype");
L
Linus Torvalds 已提交
3897
out_softnet:
3898
	proc_net_remove(net, "softnet_stat");
L
Linus Torvalds 已提交
3899
out_dev:
3900
	proc_net_remove(net, "dev");
L
Linus Torvalds 已提交
3901 3902
	goto out;
}
3903

3904
static void __net_exit dev_proc_net_exit(struct net *net)
3905 3906 3907 3908 3909 3910 3911 3912
{
	wext_proc_exit(net);

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

3913
static struct pernet_operations __net_initdata dev_proc_ops = {
3914 3915 3916 3917 3918 3919 3920 3921
	.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
3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947 3948 3949 3950
#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;
3951

E
Eric Dumazet 已提交
3952 3953
	if (old) {
		synchronize_net();
L
Linus Torvalds 已提交
3954
		dev_put(old);
E
Eric Dumazet 已提交
3955
	}
L
Linus Torvalds 已提交
3956 3957 3958 3959 3960 3961 3962 3963
	if (master)
		slave->flags |= IFF_SLAVE;
	else
		slave->flags &= ~IFF_SLAVE;

	rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
	return 0;
}
E
Eric Dumazet 已提交
3964
EXPORT_SYMBOL(netdev_set_master);
L
Linus Torvalds 已提交
3965

3966 3967
static void dev_change_rx_flags(struct net_device *dev, int flags)
{
3968 3969 3970 3971
	const struct net_device_ops *ops = dev->netdev_ops;

	if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
		ops->ndo_change_rx_flags(dev, flags);
3972 3973
}

3974
static int __dev_set_promiscuity(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
3975 3976
{
	unsigned short old_flags = dev->flags;
3977 3978
	uid_t uid;
	gid_t gid;
L
Linus Torvalds 已提交
3979

3980 3981
	ASSERT_RTNL();

3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998
	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;
		}
	}
3999
	if (dev->flags != old_flags) {
L
Linus Torvalds 已提交
4000 4001
		printk(KERN_INFO "device %s %s promiscuous mode\n",
		       dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
4002
							       "left");
4003 4004
		if (audit_enabled) {
			current_uid_gid(&uid, &gid);
4005 4006 4007 4008 4009 4010
			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),
4011
				uid, gid,
4012
				audit_get_sessionid(current));
4013
		}
4014

4015
		dev_change_rx_flags(dev, IFF_PROMISC);
L
Linus Torvalds 已提交
4016
	}
4017
	return 0;
L
Linus Torvalds 已提交
4018 4019
}

4020 4021 4022 4023 4024 4025 4026 4027 4028
/**
 *	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.
4029
 *	Return 0 if successful or a negative errno code on error.
4030
 */
4031
int dev_set_promiscuity(struct net_device *dev, int inc)
4032 4033
{
	unsigned short old_flags = dev->flags;
4034
	int err;
4035

4036
	err = __dev_set_promiscuity(dev, inc);
4037
	if (err < 0)
4038
		return err;
4039 4040
	if (dev->flags != old_flags)
		dev_set_rx_mode(dev);
4041
	return err;
4042
}
E
Eric Dumazet 已提交
4043
EXPORT_SYMBOL(dev_set_promiscuity);
4044

L
Linus Torvalds 已提交
4045 4046 4047 4048 4049 4050 4051 4052 4053 4054
/**
 *	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.
4055
 *	Return 0 if successful or a negative errno code on error.
L
Linus Torvalds 已提交
4056 4057
 */

4058
int dev_set_allmulti(struct net_device *dev, int inc)
L
Linus Torvalds 已提交
4059 4060 4061
{
	unsigned short old_flags = dev->flags;

4062 4063
	ASSERT_RTNL();

L
Linus Torvalds 已提交
4064
	dev->flags |= IFF_ALLMULTI;
4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080
	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;
		}
	}
4081
	if (dev->flags ^ old_flags) {
4082
		dev_change_rx_flags(dev, IFF_ALLMULTI);
4083
		dev_set_rx_mode(dev);
4084
	}
4085
	return 0;
4086
}
E
Eric Dumazet 已提交
4087
EXPORT_SYMBOL(dev_set_allmulti);
4088 4089 4090 4091

/*
 *	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
4092
 *	filtering it is put in promiscuous mode while unicast addresses
4093 4094 4095 4096
 *	are present.
 */
void __dev_set_rx_mode(struct net_device *dev)
{
4097 4098
	const struct net_device_ops *ops = dev->netdev_ops;

4099 4100 4101 4102 4103
	/* dev_open will call this function so the list will stay sane. */
	if (!(dev->flags&IFF_UP))
		return;

	if (!netif_device_present(dev))
4104
		return;
4105

4106 4107
	if (ops->ndo_set_rx_mode)
		ops->ndo_set_rx_mode(dev);
4108 4109 4110 4111
	else {
		/* Unicast addresses changes may only happen under the rtnl,
		 * therefore calling __dev_set_promiscuity here is safe.
		 */
4112
		if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
4113 4114
			__dev_set_promiscuity(dev, 1);
			dev->uc_promisc = 1;
4115
		} else if (netdev_uc_empty(dev) && dev->uc_promisc) {
4116 4117 4118 4119
			__dev_set_promiscuity(dev, -1);
			dev->uc_promisc = 0;
		}

4120 4121
		if (ops->ndo_set_multicast_list)
			ops->ndo_set_multicast_list(dev);
4122 4123 4124 4125 4126
	}
}

void dev_set_rx_mode(struct net_device *dev)
{
4127
	netif_addr_lock_bh(dev);
4128
	__dev_set_rx_mode(dev);
4129
	netif_addr_unlock_bh(dev);
L
Linus Torvalds 已提交
4130 4131
}

4132 4133 4134 4135 4136 4137
/**
 *	dev_get_flags - get flags reported to userspace
 *	@dev: device
 *
 *	Get the combination of flag bits exported through APIs to userspace.
 */
L
Linus Torvalds 已提交
4138 4139 4140 4141 4142 4143
unsigned dev_get_flags(const struct net_device *dev)
{
	unsigned flags;

	flags = (dev->flags & ~(IFF_PROMISC |
				IFF_ALLMULTI |
S
Stefan Rompf 已提交
4144 4145 4146
				IFF_RUNNING |
				IFF_LOWER_UP |
				IFF_DORMANT)) |
L
Linus Torvalds 已提交
4147 4148 4149
		(dev->gflags & (IFF_PROMISC |
				IFF_ALLMULTI));

S
Stefan Rompf 已提交
4150 4151 4152 4153 4154 4155 4156 4157
	if (netif_running(dev)) {
		if (netif_oper_up(dev))
			flags |= IFF_RUNNING;
		if (netif_carrier_ok(dev))
			flags |= IFF_LOWER_UP;
		if (netif_dormant(dev))
			flags |= IFF_DORMANT;
	}
L
Linus Torvalds 已提交
4158 4159 4160

	return flags;
}
E
Eric Dumazet 已提交
4161
EXPORT_SYMBOL(dev_get_flags);
L
Linus Torvalds 已提交
4162

4163
int __dev_change_flags(struct net_device *dev, unsigned int flags)
L
Linus Torvalds 已提交
4164 4165
{
	int old_flags = dev->flags;
4166
	int ret;
L
Linus Torvalds 已提交
4167

4168 4169
	ASSERT_RTNL();

L
Linus Torvalds 已提交
4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183
	/*
	 *	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.
	 */

4184 4185
	if ((old_flags ^ flags) & IFF_MULTICAST)
		dev_change_rx_flags(dev, IFF_MULTICAST);
4186

4187
	dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
4188 4189 4190 4191 4192 4193 4194 4195 4196

	/*
	 *	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  ? */
4197
		ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
L
Linus Torvalds 已提交
4198 4199

		if (!ret)
4200
			dev_set_rx_mode(dev);
L
Linus Torvalds 已提交
4201 4202 4203
	}

	if ((flags ^ dev->gflags) & IFF_PROMISC) {
E
Eric Dumazet 已提交
4204 4205
		int inc = (flags & IFF_PROMISC) ? 1 : -1;

L
Linus Torvalds 已提交
4206 4207 4208 4209 4210 4211 4212 4213 4214
		dev->gflags ^= IFF_PROMISC;
		dev_set_promiscuity(dev, inc);
	}

	/* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
	   is important. Some (broken) drivers set IFF_PROMISC, when
	   IFF_ALLMULTI is requested not asking us and not reporting.
	 */
	if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
E
Eric Dumazet 已提交
4215 4216
		int inc = (flags & IFF_ALLMULTI) ? 1 : -1;

L
Linus Torvalds 已提交
4217 4218 4219 4220
		dev->gflags ^= IFF_ALLMULTI;
		dev_set_allmulti(dev, inc);
	}

4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257
	return ret;
}

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

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

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

/**
 *	dev_change_flags - change device settings
 *	@dev: device
 *	@flags: device state flags
 *
 *	Change settings on device based state flags. The flags are
 *	in the userspace exported format.
 */
int dev_change_flags(struct net_device *dev, unsigned flags)
{
	int ret, changes;
	int old_flags = dev->flags;

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

	changes = old_flags ^ dev->flags;
4258 4259
	if (changes)
		rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
L
Linus Torvalds 已提交
4260

4261
	__dev_notify_flags(dev, old_flags);
L
Linus Torvalds 已提交
4262 4263
	return ret;
}
E
Eric Dumazet 已提交
4264
EXPORT_SYMBOL(dev_change_flags);
L
Linus Torvalds 已提交
4265

4266 4267 4268 4269 4270 4271 4272
/**
 *	dev_set_mtu - Change maximum transfer unit
 *	@dev: device
 *	@new_mtu: new transfer unit
 *
 *	Change the maximum transfer size of the network device.
 */
L
Linus Torvalds 已提交
4273 4274
int dev_set_mtu(struct net_device *dev, int new_mtu)
{
4275
	const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288
	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;
4289 4290
	if (ops->ndo_change_mtu)
		err = ops->ndo_change_mtu(dev, new_mtu);
L
Linus Torvalds 已提交
4291 4292
	else
		dev->mtu = new_mtu;
4293

L
Linus Torvalds 已提交
4294
	if (!err && dev->flags & IFF_UP)
4295
		call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
L
Linus Torvalds 已提交
4296 4297
	return err;
}
E
Eric Dumazet 已提交
4298
EXPORT_SYMBOL(dev_set_mtu);
L
Linus Torvalds 已提交
4299

4300 4301 4302 4303 4304 4305 4306
/**
 *	dev_set_mac_address - Change Media Access Control Address
 *	@dev: device
 *	@sa: new address
 *
 *	Change the hardware (MAC) address of the device
 */
L
Linus Torvalds 已提交
4307 4308
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
{
4309
	const struct net_device_ops *ops = dev->netdev_ops;
L
Linus Torvalds 已提交
4310 4311
	int err;

4312
	if (!ops->ndo_set_mac_address)
L
Linus Torvalds 已提交
4313 4314 4315 4316 4317
		return -EOPNOTSUPP;
	if (sa->sa_family != dev->type)
		return -EINVAL;
	if (!netif_device_present(dev))
		return -ENODEV;
4318
	err = ops->ndo_set_mac_address(dev, sa);
L
Linus Torvalds 已提交
4319
	if (!err)
4320
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
L
Linus Torvalds 已提交
4321 4322
	return err;
}
E
Eric Dumazet 已提交
4323
EXPORT_SYMBOL(dev_set_mac_address);
L
Linus Torvalds 已提交
4324 4325

/*
E
Eric Dumazet 已提交
4326
 *	Perform the SIOCxIFxxx calls, inside rcu_read_lock()
L
Linus Torvalds 已提交
4327
 */
4328
static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
L
Linus Torvalds 已提交
4329 4330
{
	int err;
E
Eric Dumazet 已提交
4331
	struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
L
Linus Torvalds 已提交
4332 4333 4334 4335 4336

	if (!dev)
		return -ENODEV;

	switch (cmd) {
E
Eric Dumazet 已提交
4337 4338 4339
	case SIOCGIFFLAGS:	/* Get interface flags */
		ifr->ifr_flags = (short) dev_get_flags(dev);
		return 0;
L
Linus Torvalds 已提交
4340

E
Eric Dumazet 已提交
4341 4342 4343 4344
	case SIOCGIFMETRIC:	/* Get the metric on the interface
				   (currently unused) */
		ifr->ifr_metric = 0;
		return 0;
L
Linus Torvalds 已提交
4345

E
Eric Dumazet 已提交
4346 4347 4348
	case SIOCGIFMTU:	/* Get the MTU of a device */
		ifr->ifr_mtu = dev->mtu;
		return 0;
L
Linus Torvalds 已提交
4349

E
Eric Dumazet 已提交
4350 4351 4352 4353 4354 4355 4356 4357
	case SIOCGIFHWADDR:
		if (!dev->addr_len)
			memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
		else
			memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
			       min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
		ifr->ifr_hwaddr.sa_family = dev->type;
		return 0;
L
Linus Torvalds 已提交
4358

E
Eric Dumazet 已提交
4359 4360 4361
	case SIOCGIFSLAVE:
		err = -EINVAL;
		break;
4362

E
Eric Dumazet 已提交
4363 4364 4365 4366 4367 4368 4369 4370
	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;
4371

E
Eric Dumazet 已提交
4372 4373 4374
	case SIOCGIFINDEX:
		ifr->ifr_ifindex = dev->ifindex;
		return 0;
4375

E
Eric Dumazet 已提交
4376 4377 4378
	case SIOCGIFTXQLEN:
		ifr->ifr_qlen = dev->tx_queue_len;
		return 0;
4379

E
Eric Dumazet 已提交
4380 4381 4382 4383 4384 4385 4386
	default:
		/* dev_ioctl() should ensure this case
		 * is never reached
		 */
		WARN_ON(1);
		err = -EINVAL;
		break;
4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398

	}
	return err;
}

/*
 *	Perform the SIOCxIFxxx calls, inside rtnl_lock()
 */
static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
{
	int err;
	struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
J
Jarek Poplawski 已提交
4399
	const struct net_device_ops *ops;
4400 4401 4402 4403

	if (!dev)
		return -ENODEV;

J
Jarek Poplawski 已提交
4404 4405
	ops = dev->netdev_ops;

4406
	switch (cmd) {
E
Eric Dumazet 已提交
4407 4408
	case SIOCSIFFLAGS:	/* Set interface flags */
		return dev_change_flags(dev, ifr->ifr_flags);
4409

E
Eric Dumazet 已提交
4410 4411 4412
	case SIOCSIFMETRIC:	/* Set the metric on the interface
				   (currently unused) */
		return -EOPNOTSUPP;
4413

E
Eric Dumazet 已提交
4414 4415
	case SIOCSIFMTU:	/* Set the MTU of a device */
		return dev_set_mtu(dev, ifr->ifr_mtu);
L
Linus Torvalds 已提交
4416

E
Eric Dumazet 已提交
4417 4418
	case SIOCSIFHWADDR:
		return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
L
Linus Torvalds 已提交
4419

E
Eric Dumazet 已提交
4420 4421 4422 4423 4424 4425 4426
	case SIOCSIFHWBROADCAST:
		if (ifr->ifr_hwaddr.sa_family != dev->type)
			return -EINVAL;
		memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
		       min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
		call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
		return 0;
L
Linus Torvalds 已提交
4427

E
Eric Dumazet 已提交
4428 4429
	case SIOCSIFMAP:
		if (ops->ndo_set_config) {
L
Linus Torvalds 已提交
4430 4431
			if (!netif_device_present(dev))
				return -ENODEV;
E
Eric Dumazet 已提交
4432 4433 4434
			return ops->ndo_set_config(dev, &ifr->ifr_map);
		}
		return -EOPNOTSUPP;
L
Linus Torvalds 已提交
4435

E
Eric Dumazet 已提交
4436 4437 4438 4439 4440 4441
	case SIOCADDMULTI:
		if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
			return -EINVAL;
		if (!netif_device_present(dev))
			return -ENODEV;
4442
		return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
E
Eric Dumazet 已提交
4443 4444 4445 4446 4447 4448 4449

	case SIOCDELMULTI:
		if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
		    ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
			return -EINVAL;
		if (!netif_device_present(dev))
			return -ENODEV;
4450
		return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
L
Linus Torvalds 已提交
4451

E
Eric Dumazet 已提交
4452 4453 4454 4455 4456
	case SIOCSIFTXQLEN:
		if (ifr->ifr_qlen < 0)
			return -EINVAL;
		dev->tx_queue_len = ifr->ifr_qlen;
		return 0;
L
Linus Torvalds 已提交
4457

E
Eric Dumazet 已提交
4458 4459 4460
	case SIOCSIFNAME:
		ifr->ifr_newname[IFNAMSIZ-1] = '\0';
		return dev_change_name(dev, ifr->ifr_newname);
L
Linus Torvalds 已提交
4461

E
Eric Dumazet 已提交
4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489
	/*
	 *	Unknown or private ioctl
	 */
	default:
		if ((cmd >= SIOCDEVPRIVATE &&
		    cmd <= SIOCDEVPRIVATE + 15) ||
		    cmd == SIOCBONDENSLAVE ||
		    cmd == SIOCBONDRELEASE ||
		    cmd == SIOCBONDSETHWADDR ||
		    cmd == SIOCBONDSLAVEINFOQUERY ||
		    cmd == SIOCBONDINFOQUERY ||
		    cmd == SIOCBONDCHANGEACTIVE ||
		    cmd == SIOCGMIIPHY ||
		    cmd == SIOCGMIIREG ||
		    cmd == SIOCSMIIREG ||
		    cmd == SIOCBRADDIF ||
		    cmd == SIOCBRDELIF ||
		    cmd == SIOCSHWTSTAMP ||
		    cmd == SIOCWANDEV) {
			err = -EOPNOTSUPP;
			if (ops->ndo_do_ioctl) {
				if (netif_device_present(dev))
					err = ops->ndo_do_ioctl(dev, ifr, cmd);
				else
					err = -ENODEV;
			}
		} else
			err = -EINVAL;
L
Linus Torvalds 已提交
4490 4491 4492 4493 4494 4495 4496 4497 4498 4499 4500 4501

	}
	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
4502
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
4503 4504 4505 4506 4507 4508 4509 4510 4511
 *	@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.
 */

4512
int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
L
Linus Torvalds 已提交
4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523
{
	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) {
4524
		rtnl_lock();
4525
		ret = dev_ifconf(net, (char __user *) arg);
4526
		rtnl_unlock();
L
Linus Torvalds 已提交
4527 4528 4529
		return ret;
	}
	if (cmd == SIOCGIFNAME)
4530
		return dev_ifname(net, (struct ifreq __user *)arg);
L
Linus Torvalds 已提交
4531 4532 4533 4534 4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545

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

	ifr.ifr_name[IFNAMSIZ-1] = 0;

	colon = strchr(ifr.ifr_name, ':');
	if (colon)
		*colon = 0;

	/*
	 *	See which interface the caller is talking about.
	 */

	switch (cmd) {
E
Eric Dumazet 已提交
4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560
	/*
	 *	These ioctl calls:
	 *	- can be done by all.
	 *	- atomic and do not require locking.
	 *	- return a value
	 */
	case SIOCGIFFLAGS:
	case SIOCGIFMETRIC:
	case SIOCGIFMTU:
	case SIOCGIFHWADDR:
	case SIOCGIFSLAVE:
	case SIOCGIFMAP:
	case SIOCGIFINDEX:
	case SIOCGIFTXQLEN:
		dev_load(net, ifr.ifr_name);
E
Eric Dumazet 已提交
4561
		rcu_read_lock();
E
Eric Dumazet 已提交
4562
		ret = dev_ifsioc_locked(net, &ifr, cmd);
E
Eric Dumazet 已提交
4563
		rcu_read_unlock();
E
Eric Dumazet 已提交
4564 4565 4566 4567 4568 4569 4570 4571
		if (!ret) {
			if (colon)
				*colon = ':';
			if (copy_to_user(arg, &ifr,
					 sizeof(struct ifreq)))
				ret = -EFAULT;
		}
		return ret;
L
Linus Torvalds 已提交
4572

E
Eric Dumazet 已提交
4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585
	case SIOCETHTOOL:
		dev_load(net, ifr.ifr_name);
		rtnl_lock();
		ret = dev_ethtool(net, &ifr);
		rtnl_unlock();
		if (!ret) {
			if (colon)
				*colon = ':';
			if (copy_to_user(arg, &ifr,
					 sizeof(struct ifreq)))
				ret = -EFAULT;
		}
		return ret;
L
Linus Torvalds 已提交
4586

E
Eric Dumazet 已提交
4587 4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609
	/*
	 *	These ioctl calls:
	 *	- require superuser power.
	 *	- require strict serialization.
	 *	- return a value
	 */
	case SIOCGMIIPHY:
	case SIOCGMIIREG:
	case SIOCSIFNAME:
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		dev_load(net, ifr.ifr_name);
		rtnl_lock();
		ret = dev_ifsioc(net, &ifr, cmd);
		rtnl_unlock();
		if (!ret) {
			if (colon)
				*colon = ':';
			if (copy_to_user(arg, &ifr,
					 sizeof(struct ifreq)))
				ret = -EFAULT;
		}
		return ret;
L
Linus Torvalds 已提交
4610

E
Eric Dumazet 已提交
4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661
	/*
	 *	These ioctl calls:
	 *	- require superuser power.
	 *	- require strict serialization.
	 *	- do not return a value
	 */
	case SIOCSIFFLAGS:
	case SIOCSIFMETRIC:
	case SIOCSIFMTU:
	case SIOCSIFMAP:
	case SIOCSIFHWADDR:
	case SIOCSIFSLAVE:
	case SIOCADDMULTI:
	case SIOCDELMULTI:
	case SIOCSIFHWBROADCAST:
	case SIOCSIFTXQLEN:
	case SIOCSMIIREG:
	case SIOCBONDENSLAVE:
	case SIOCBONDRELEASE:
	case SIOCBONDSETHWADDR:
	case SIOCBONDCHANGEACTIVE:
	case SIOCBRADDIF:
	case SIOCBRDELIF:
	case SIOCSHWTSTAMP:
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;
		/* fall through */
	case SIOCBONDSLAVEINFOQUERY:
	case SIOCBONDINFOQUERY:
		dev_load(net, ifr.ifr_name);
		rtnl_lock();
		ret = dev_ifsioc(net, &ifr, cmd);
		rtnl_unlock();
		return ret;

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

	/*
	 *	Unknown or private ioctl.
	 */
	default:
		if (cmd == SIOCWANDEV ||
		    (cmd >= SIOCDEVPRIVATE &&
		     cmd <= SIOCDEVPRIVATE + 15)) {
4662
			dev_load(net, ifr.ifr_name);
L
Linus Torvalds 已提交
4663
			rtnl_lock();
4664
			ret = dev_ifsioc(net, &ifr, cmd);
L
Linus Torvalds 已提交
4665
			rtnl_unlock();
E
Eric Dumazet 已提交
4666 4667 4668
			if (!ret && copy_to_user(arg, &ifr,
						 sizeof(struct ifreq)))
				ret = -EFAULT;
L
Linus Torvalds 已提交
4669
			return ret;
E
Eric Dumazet 已提交
4670 4671 4672 4673 4674
		}
		/* Take care of Wireless Extensions */
		if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
			return wext_handle_ioctl(net, &ifr, cmd, arg);
		return -EINVAL;
L
Linus Torvalds 已提交
4675 4676 4677 4678 4679 4680
	}
}


/**
 *	dev_new_index	-	allocate an ifindex
4681
 *	@net: the applicable net namespace
L
Linus Torvalds 已提交
4682 4683 4684 4685 4686
 *
 *	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.
 */
4687
static int dev_new_index(struct net *net)
L
Linus Torvalds 已提交
4688 4689 4690 4691 4692
{
	static int ifindex;
	for (;;) {
		if (++ifindex <= 0)
			ifindex = 1;
4693
		if (!__dev_get_by_index(net, ifindex))
L
Linus Torvalds 已提交
4694 4695 4696 4697 4698
			return ifindex;
	}
}

/* Delayed registration/unregisteration */
4699
static LIST_HEAD(net_todo_list);
L
Linus Torvalds 已提交
4700

4701
static void net_set_todo(struct net_device *dev)
L
Linus Torvalds 已提交
4702 4703 4704 4705
{
	list_add_tail(&dev->todo_list, &net_todo_list);
}

4706
static void rollback_registered_many(struct list_head *head)
4707
{
4708
	struct net_device *dev, *tmp;
4709

4710 4711 4712
	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

4713
	list_for_each_entry_safe(dev, tmp, head, unreg_list) {
4714
		/* Some devices call without registering
4715 4716
		 * for initialization unwind. Remove those
		 * devices and proceed with the remaining.
4717 4718 4719 4720
		 */
		if (dev->reg_state == NETREG_UNINITIALIZED) {
			pr_debug("unregister_netdevice: device %s/%p never "
				 "was registered\n", dev->name, dev);
4721

4722
			WARN_ON(1);
4723 4724
			list_del(&dev->unreg_list);
			continue;
4725
		}
4726

4727
		BUG_ON(dev->reg_state != NETREG_REGISTERED);
4728

4729 4730
		/* If device is running, close it first. */
		dev_close(dev);
4731

4732 4733
		/* And unlink it from device chain. */
		unlist_netdevice(dev);
4734

4735 4736
		dev->reg_state = NETREG_UNREGISTERING;
	}
4737 4738 4739

	synchronize_net();

4740 4741 4742
	list_for_each_entry(dev, head, unreg_list) {
		/* Shutdown queueing discipline. */
		dev_shutdown(dev);
4743 4744


4745 4746 4747 4748
		/* Notify protocols, that we are about to destroy
		   this device. They should clean all the things.
		*/
		call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4749

4750 4751 4752 4753
		if (!dev->rtnl_link_ops ||
		    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
			rtmsg_ifinfo(RTM_DELLINK, dev, ~0U);

4754 4755 4756
		/*
		 *	Flush the unicast and multicast chains
		 */
4757
		dev_uc_flush(dev);
4758
		dev_mc_flush(dev);
4759

4760 4761
		if (dev->netdev_ops->ndo_uninit)
			dev->netdev_ops->ndo_uninit(dev);
4762

4763 4764
		/* Notifier chain MUST detach us from master device. */
		WARN_ON(dev->master);
4765

4766 4767 4768
		/* Remove entries from kobject tree */
		netdev_unregister_kobject(dev);
	}
4769

4770
	/* Process any work delayed until the end of the batch */
4771
	dev = list_first_entry(head, struct net_device, unreg_list);
4772
	call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
4773

4774
	synchronize_net();
4775

4776
	list_for_each_entry(dev, head, unreg_list)
4777 4778 4779 4780 4781 4782 4783 4784 4785
		dev_put(dev);
}

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

	list_add(&dev->unreg_list, &single);
	rollback_registered_many(&single);
4786 4787
}

4788 4789 4790
static void __netdev_init_queue_locks_one(struct net_device *dev,
					  struct netdev_queue *dev_queue,
					  void *_unused)
4791 4792
{
	spin_lock_init(&dev_queue->_xmit_lock);
4793
	netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4794 4795 4796 4797 4798
	dev_queue->xmit_lock_owner = -1;
}

static void netdev_init_queue_locks(struct net_device *dev)
{
4799 4800
	netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
	__netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4801 4802
}

4803 4804 4805 4806 4807 4808 4809 4810 4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830 4831 4832 4833 4834 4835 4836 4837 4838 4839 4840 4841 4842
unsigned long netdev_fix_features(unsigned long features, const char *name)
{
	/* Fix illegal SG+CSUM combinations. */
	if ((features & NETIF_F_SG) &&
	    !(features & NETIF_F_ALL_CSUM)) {
		if (name)
			printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
			       "checksum feature.\n", name);
		features &= ~NETIF_F_SG;
	}

	/* TSO requires that SG is present as well. */
	if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
		if (name)
			printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
			       "SG feature.\n", name);
		features &= ~NETIF_F_TSO;
	}

	if (features & NETIF_F_UFO) {
		if (!(features & NETIF_F_GEN_CSUM)) {
			if (name)
				printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
				       "since no NETIF_F_HW_CSUM feature.\n",
				       name);
			features &= ~NETIF_F_UFO;
		}

		if (!(features & NETIF_F_SG)) {
			if (name)
				printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
				       "since no NETIF_F_SG feature.\n", name);
			features &= ~NETIF_F_UFO;
		}
	}

	return features;
}
EXPORT_SYMBOL(netdev_fix_features);

4843 4844 4845 4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869
/**
 *	netif_stacked_transfer_operstate -	transfer operstate
 *	@rootdev: the root or lower level device to transfer state from
 *	@dev: the device to transfer operstate to
 *
 *	Transfer operational state from root to device. This is normally
 *	called when a stacking relationship exists between the root
 *	device and the device(a leaf device).
 */
void netif_stacked_transfer_operstate(const struct net_device *rootdev,
					struct net_device *dev)
{
	if (rootdev->operstate == IF_OPER_DORMANT)
		netif_dormant_on(dev);
	else
		netif_dormant_off(dev);

	if (netif_carrier_ok(rootdev)) {
		if (!netif_carrier_ok(dev))
			netif_carrier_on(dev);
	} else {
		if (netif_carrier_ok(dev))
			netif_carrier_off(dev);
	}
}
EXPORT_SYMBOL(netif_stacked_transfer_operstate);

L
Linus Torvalds 已提交
4870 4871 4872 4873 4874 4875 4876 4877 4878 4879 4880 4881 4882 4883 4884 4885 4886 4887 4888 4889
/**
 *	register_netdevice	- register a network device
 *	@dev: device to register
 *
 *	Take a completed network device structure and add it to the kernel
 *	interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
 *	chain. 0 is returned on success. A negative errno code is returned
 *	on a failure to set up the device, or if the name is a duplicate.
 *
 *	Callers must hold the rtnl semaphore. You may want
 *	register_netdev() instead of this.
 *
 *	BUGS:
 *	The locking appears insufficient to guarantee two parallel registers
 *	will not get the same name.
 */

int register_netdevice(struct net_device *dev)
{
	int ret;
4890
	struct net *net = dev_net(dev);
L
Linus Torvalds 已提交
4891 4892 4893 4894

	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

4895 4896
	might_sleep();

L
Linus Torvalds 已提交
4897 4898
	/* When net_device's are persistent, this will be fatal. */
	BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4899
	BUG_ON(!net);
L
Linus Torvalds 已提交
4900

4901
	spin_lock_init(&dev->addr_list_lock);
4902
	netdev_set_addr_lockdep_class(dev);
4903
	netdev_init_queue_locks(dev);
L
Linus Torvalds 已提交
4904 4905 4906

	dev->iflink = -1;

E
Eric Dumazet 已提交
4907
#ifdef CONFIG_RPS
T
Tom Herbert 已提交
4908 4909 4910 4911 4912 4913 4914 4915 4916 4917 4918 4919 4920 4921 4922 4923
	if (!dev->num_rx_queues) {
		/*
		 * Allocate a single RX queue if driver never called
		 * alloc_netdev_mq
		 */

		dev->_rx = kzalloc(sizeof(struct netdev_rx_queue), GFP_KERNEL);
		if (!dev->_rx) {
			ret = -ENOMEM;
			goto out;
		}

		dev->_rx->first = dev->_rx;
		atomic_set(&dev->_rx->count, 1);
		dev->num_rx_queues = 1;
	}
E
Eric Dumazet 已提交
4924
#endif
L
Linus Torvalds 已提交
4925
	/* Init, if this function is available */
4926 4927
	if (dev->netdev_ops->ndo_init) {
		ret = dev->netdev_ops->ndo_init(dev);
L
Linus Torvalds 已提交
4928 4929 4930
		if (ret) {
			if (ret > 0)
				ret = -EIO;
4931
			goto out;
L
Linus Torvalds 已提交
4932 4933
		}
	}
4934

4935 4936
	ret = dev_get_valid_name(net, dev->name, dev->name, 0);
	if (ret)
4937
		goto err_uninit;
L
Linus Torvalds 已提交
4938

4939
	dev->ifindex = dev_new_index(net);
L
Linus Torvalds 已提交
4940 4941 4942
	if (dev->iflink == -1)
		dev->iflink = dev->ifindex;

4943 4944 4945 4946 4947 4948 4949 4950 4951 4952 4953 4954 4955 4956 4957
	/* 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);
	}

4958
	dev->features = netdev_fix_features(dev->features, dev->name);
L
Linus Torvalds 已提交
4959

4960 4961 4962 4963
	/* Enable software GSO if SG is supported. */
	if (dev->features & NETIF_F_SG)
		dev->features |= NETIF_F_GSO;

4964
	netdev_initialize_kobject(dev);
4965 4966 4967 4968 4969 4970

	ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
	ret = notifier_to_errno(ret);
	if (ret)
		goto err_uninit;

4971
	ret = netdev_register_kobject(dev);
4972
	if (ret)
4973
		goto err_uninit;
4974 4975
	dev->reg_state = NETREG_REGISTERED;

L
Linus Torvalds 已提交
4976 4977 4978 4979 4980 4981 4982 4983 4984
	/*
	 *	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);
4985
	list_netdevice(dev);
L
Linus Torvalds 已提交
4986 4987

	/* Notify protocols, that a new device appeared. */
4988
	ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4989
	ret = notifier_to_errno(ret);
4990 4991 4992 4993
	if (ret) {
		rollback_registered(dev);
		dev->reg_state = NETREG_UNREGISTERED;
	}
4994 4995 4996 4997
	/*
	 *	Prevent userspace races by waiting until the network
	 *	device is fully setup before sending notifications.
	 */
4998 4999 5000
	if (!dev->rtnl_link_ops ||
	    dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
		rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);
L
Linus Torvalds 已提交
5001 5002 5003

out:
	return ret;
5004 5005

err_uninit:
5006 5007
	if (dev->netdev_ops->ndo_uninit)
		dev->netdev_ops->ndo_uninit(dev);
5008
	goto out;
L
Linus Torvalds 已提交
5009
}
E
Eric Dumazet 已提交
5010
EXPORT_SYMBOL(register_netdevice);
L
Linus Torvalds 已提交
5011

5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 5025 5026 5027 5028 5029 5030 5031 5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050
/**
 *	init_dummy_netdev	- init a dummy network device for NAPI
 *	@dev: device to init
 *
 *	This takes a network device structure and initialize the minimum
 *	amount of fields so it can be used to schedule NAPI polls without
 *	registering a full blown interface. This is to be used by drivers
 *	that need to tie several hardware interfaces to a single NAPI
 *	poll scheduler due to HW limitations.
 */
int init_dummy_netdev(struct net_device *dev)
{
	/* Clear everything. Note we don't initialize spinlocks
	 * are they aren't supposed to be taken by any of the
	 * NAPI code and this dummy netdev is supposed to be
	 * only ever used for NAPI polls
	 */
	memset(dev, 0, sizeof(struct net_device));

	/* make sure we BUG if trying to hit standard
	 * register/unregister code path
	 */
	dev->reg_state = NETREG_DUMMY;

	/* initialize the ref count */
	atomic_set(&dev->refcnt, 1);

	/* NAPI wants this */
	INIT_LIST_HEAD(&dev->napi_list);

	/* a dummy interface is started by default */
	set_bit(__LINK_STATE_PRESENT, &dev->state);
	set_bit(__LINK_STATE_START, &dev->state);

	return 0;
}
EXPORT_SYMBOL_GPL(init_dummy_netdev);


L
Linus Torvalds 已提交
5051 5052 5053 5054 5055 5056 5057 5058 5059
/**
 *	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.
 *
5060
 *	This is a wrapper around register_netdevice that takes the rtnl semaphore
L
Linus Torvalds 已提交
5061 5062 5063 5064 5065 5066 5067 5068 5069 5070 5071 5072 5073 5074 5075 5076 5077 5078
 *	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;
	}
5079

L
Linus Torvalds 已提交
5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092 5093 5094 5095
	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
5096
 * call dev_put.
L
Linus Torvalds 已提交
5097 5098 5099 5100 5101
 */
static void netdev_wait_allrefs(struct net_device *dev)
{
	unsigned long rebroadcast_time, warning_time;

5102 5103
	linkwatch_forget_dev(dev);

L
Linus Torvalds 已提交
5104 5105 5106
	rebroadcast_time = warning_time = jiffies;
	while (atomic_read(&dev->refcnt) != 0) {
		if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
5107
			rtnl_lock();
L
Linus Torvalds 已提交
5108 5109

			/* Rebroadcast unregister notification */
5110
			call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5111
			/* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users
5112
			 * should have already handle it the first time */
L
Linus Torvalds 已提交
5113 5114 5115 5116 5117 5118 5119 5120 5121 5122 5123 5124

			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();
			}

5125
			__rtnl_unlock();
L
Linus Torvalds 已提交
5126 5127 5128 5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155

			rebroadcast_time = jiffies;
		}

		msleep(250);

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

/* The sequence is:
 *
 *	rtnl_lock();
 *	...
 *	register_netdevice(x1);
 *	register_netdevice(x2);
 *	...
 *	unregister_netdevice(y1);
 *	unregister_netdevice(y2);
 *      ...
 *	rtnl_unlock();
 *	free_netdev(y1);
 *	free_netdev(y2);
 *
H
Herbert Xu 已提交
5156
 * We are invoked by rtnl_unlock().
L
Linus Torvalds 已提交
5157
 * This allows us to deal with problems:
5158
 * 1) We can delete sysfs objects which invoke hotplug
L
Linus Torvalds 已提交
5159 5160 5161
 *    without deadlocking with linkwatch via keventd.
 * 2) Since we run with the RTNL semaphore not held, we can sleep
 *    safely in order to wait for the netdev refcnt to drop to zero.
H
Herbert Xu 已提交
5162 5163 5164
 *
 * We must not return until all unregister events added during
 * the interval the lock was held have been completed.
L
Linus Torvalds 已提交
5165 5166 5167
 */
void netdev_run_todo(void)
{
5168
	struct list_head list;
L
Linus Torvalds 已提交
5169 5170

	/* Snapshot list, allow later requests */
5171
	list_replace_init(&net_todo_list, &list);
H
Herbert Xu 已提交
5172 5173

	__rtnl_unlock();
5174

L
Linus Torvalds 已提交
5175 5176
	while (!list_empty(&list)) {
		struct net_device *dev
5177
			= list_first_entry(&list, struct net_device, todo_list);
L
Linus Torvalds 已提交
5178 5179
		list_del(&dev->todo_list);

5180 5181 5182 5183 5184 5185
		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
5186

5187
		dev->reg_state = NETREG_UNREGISTERED;
L
Linus Torvalds 已提交
5188

5189
		on_each_cpu(flush_backlog, dev, 1);
5190

5191
		netdev_wait_allrefs(dev);
L
Linus Torvalds 已提交
5192

5193 5194
		/* paranoia */
		BUG_ON(atomic_read(&dev->refcnt));
5195 5196 5197
		WARN_ON(dev->ip_ptr);
		WARN_ON(dev->ip6_ptr);
		WARN_ON(dev->dn_ptr);
L
Linus Torvalds 已提交
5198

5199 5200
		if (dev->destructor)
			dev->destructor(dev);
5201 5202 5203

		/* Free network device */
		kobject_put(&dev->dev.kobj);
L
Linus Torvalds 已提交
5204 5205 5206
	}
}

5207 5208 5209 5210 5211 5212 5213 5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232
/**
 *	dev_txq_stats_fold - fold tx_queues stats
 *	@dev: device to get statistics from
 *	@stats: struct net_device_stats to hold results
 */
void dev_txq_stats_fold(const struct net_device *dev,
			struct net_device_stats *stats)
{
	unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
	unsigned int i;
	struct netdev_queue *txq;

	for (i = 0; i < dev->num_tx_queues; i++) {
		txq = netdev_get_tx_queue(dev, i);
		tx_bytes   += txq->tx_bytes;
		tx_packets += txq->tx_packets;
		tx_dropped += txq->tx_dropped;
	}
	if (tx_bytes || tx_packets || tx_dropped) {
		stats->tx_bytes   = tx_bytes;
		stats->tx_packets = tx_packets;
		stats->tx_dropped = tx_dropped;
	}
}
EXPORT_SYMBOL(dev_txq_stats_fold);

5233 5234 5235 5236 5237 5238 5239 5240 5241
/**
 *	dev_get_stats	- get network device statistics
 *	@dev: device to get statistics from
 *
 *	Get network statistics from device. The device driver may provide
 *	its own method by setting dev->netdev_ops->get_stats; otherwise
 *	the internal statistics structure is used.
 */
const struct net_device_stats *dev_get_stats(struct net_device *dev)
5242
{
5243 5244 5245 5246
	const struct net_device_ops *ops = dev->netdev_ops;

	if (ops->ndo_get_stats)
		return ops->ndo_get_stats(dev);
5247 5248 5249

	dev_txq_stats_fold(dev, &dev->stats);
	return &dev->stats;
R
Rusty Russell 已提交
5250
}
5251
EXPORT_SYMBOL(dev_get_stats);
R
Rusty Russell 已提交
5252

5253
static void netdev_init_one_queue(struct net_device *dev,
5254 5255
				  struct netdev_queue *queue,
				  void *_unused)
5256 5257 5258 5259
{
	queue->dev = dev;
}

5260 5261
static void netdev_init_queues(struct net_device *dev)
{
5262 5263
	netdev_init_one_queue(dev, &dev->rx_queue, NULL);
	netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5264
	spin_lock_init(&dev->tx_global_lock);
5265 5266
}

L
Linus Torvalds 已提交
5267
/**
5268
 *	alloc_netdev_mq - allocate network device
L
Linus Torvalds 已提交
5269 5270 5271
 *	@sizeof_priv:	size of private data to allocate space for
 *	@name:		device name format string
 *	@setup:		callback to initialize device
5272
 *	@queue_count:	the number of subqueues to allocate
L
Linus Torvalds 已提交
5273 5274
 *
 *	Allocates a struct net_device with private data area for driver use
5275 5276
 *	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
5277
 */
5278 5279
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
5280
{
5281
	struct netdev_queue *tx;
L
Linus Torvalds 已提交
5282
	struct net_device *dev;
5283
	size_t alloc_size;
5284
	struct net_device *p;
E
Eric Dumazet 已提交
5285 5286
#ifdef CONFIG_RPS
	struct netdev_rx_queue *rx;
T
Tom Herbert 已提交
5287
	int i;
E
Eric Dumazet 已提交
5288
#endif
L
Linus Torvalds 已提交
5289

5290 5291
	BUG_ON(strlen(name) >= sizeof(dev->name));

5292
	alloc_size = sizeof(struct net_device);
5293 5294
	if (sizeof_priv) {
		/* ensure 32-byte alignment of private area */
5295
		alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5296 5297 5298
		alloc_size += sizeof_priv;
	}
	/* ensure 32-byte alignment of whole construct */
5299
	alloc_size += NETDEV_ALIGN - 1;
L
Linus Torvalds 已提交
5300

5301
	p = kzalloc(alloc_size, GFP_KERNEL);
L
Linus Torvalds 已提交
5302
	if (!p) {
5303
		printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
L
Linus Torvalds 已提交
5304 5305 5306
		return NULL;
	}

5307
	tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5308 5309 5310
	if (!tx) {
		printk(KERN_ERR "alloc_netdev: Unable to allocate "
		       "tx qdiscs.\n");
5311
		goto free_p;
5312 5313
	}

E
Eric Dumazet 已提交
5314
#ifdef CONFIG_RPS
T
Tom Herbert 已提交
5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329
	rx = kcalloc(queue_count, sizeof(struct netdev_rx_queue), GFP_KERNEL);
	if (!rx) {
		printk(KERN_ERR "alloc_netdev: Unable to allocate "
		       "rx queues.\n");
		goto free_tx;
	}

	atomic_set(&rx->count, queue_count);

	/*
	 * Set a pointer to first element in the array which holds the
	 * reference count.
	 */
	for (i = 0; i < queue_count; i++)
		rx[i].first = rx;
E
Eric Dumazet 已提交
5330
#endif
T
Tom Herbert 已提交
5331

5332
	dev = PTR_ALIGN(p, NETDEV_ALIGN);
L
Linus Torvalds 已提交
5333
	dev->padded = (char *)dev - (char *)p;
5334 5335

	if (dev_addr_init(dev))
T
Tom Herbert 已提交
5336
		goto free_rx;
5337

5338
	dev_mc_init(dev);
5339
	dev_uc_init(dev);
J
Jiri Pirko 已提交
5340

5341
	dev_net_set(dev, &init_net);
L
Linus Torvalds 已提交
5342

5343 5344
	dev->_tx = tx;
	dev->num_tx_queues = queue_count;
5345
	dev->real_num_tx_queues = queue_count;
5346

E
Eric Dumazet 已提交
5347
#ifdef CONFIG_RPS
T
Tom Herbert 已提交
5348 5349
	dev->_rx = rx;
	dev->num_rx_queues = queue_count;
E
Eric Dumazet 已提交
5350
#endif
T
Tom Herbert 已提交
5351

5352
	dev->gso_max_size = GSO_MAX_SIZE;
L
Linus Torvalds 已提交
5353

5354 5355
	netdev_init_queues(dev);

5356 5357
	INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list);
	dev->ethtool_ntuple_list.count = 0;
5358
	INIT_LIST_HEAD(&dev->napi_list);
5359
	INIT_LIST_HEAD(&dev->unreg_list);
5360
	INIT_LIST_HEAD(&dev->link_watch_list);
5361
	dev->priv_flags = IFF_XMIT_DST_RELEASE;
L
Linus Torvalds 已提交
5362 5363 5364
	setup(dev);
	strcpy(dev->name, name);
	return dev;
5365

T
Tom Herbert 已提交
5366
free_rx:
E
Eric Dumazet 已提交
5367
#ifdef CONFIG_RPS
T
Tom Herbert 已提交
5368
	kfree(rx);
5369
free_tx:
E
Eric Dumazet 已提交
5370
#endif
5371 5372 5373 5374
	kfree(tx);
free_p:
	kfree(p);
	return NULL;
L
Linus Torvalds 已提交
5375
}
5376
EXPORT_SYMBOL(alloc_netdev_mq);
L
Linus Torvalds 已提交
5377 5378 5379 5380 5381

/**
 *	free_netdev - free network device
 *	@dev: device
 *
5382 5383
 *	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
5384 5385 5386 5387
 *	If this is the last reference then it will be freed.
 */
void free_netdev(struct net_device *dev)
{
5388 5389
	struct napi_struct *p, *n;

5390 5391
	release_net(dev_net(dev));

5392 5393
	kfree(dev->_tx);

5394 5395 5396
	/* Flush device addresses */
	dev_addr_flush(dev);

5397 5398 5399
	/* Clear ethtool n-tuple list */
	ethtool_ntuple_flush(dev);

5400 5401 5402
	list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
		netif_napi_del(p);

S
Stephen Hemminger 已提交
5403
	/*  Compatibility with error handling in drivers */
L
Linus Torvalds 已提交
5404 5405 5406 5407 5408 5409 5410 5411
	if (dev->reg_state == NETREG_UNINITIALIZED) {
		kfree((char *)dev - dev->padded);
		return;
	}

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

5412 5413
	/* will free via device release */
	put_device(&dev->dev);
L
Linus Torvalds 已提交
5414
}
E
Eric Dumazet 已提交
5415
EXPORT_SYMBOL(free_netdev);
5416

5417 5418 5419 5420 5421 5422
/**
 *	synchronize_net -  Synchronize with packet receive processing
 *
 *	Wait for packets currently being received to be done.
 *	Does not block later packets from starting.
 */
5423
void synchronize_net(void)
L
Linus Torvalds 已提交
5424 5425
{
	might_sleep();
5426
	synchronize_rcu();
L
Linus Torvalds 已提交
5427
}
E
Eric Dumazet 已提交
5428
EXPORT_SYMBOL(synchronize_net);
L
Linus Torvalds 已提交
5429 5430

/**
5431
 *	unregister_netdevice_queue - remove device from the kernel
L
Linus Torvalds 已提交
5432
 *	@dev: device
5433
 *	@head: list
5434
 *
L
Linus Torvalds 已提交
5435
 *	This function shuts down a device interface and removes it
5436
 *	from the kernel tables.
5437
 *	If head not NULL, device is queued to be unregistered later.
L
Linus Torvalds 已提交
5438 5439 5440 5441 5442
 *
 *	Callers must hold the rtnl semaphore.  You may want
 *	unregister_netdev() instead of this.
 */

5443
void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
L
Linus Torvalds 已提交
5444
{
5445 5446
	ASSERT_RTNL();

5447
	if (head) {
5448
		list_move_tail(&dev->unreg_list, head);
5449 5450 5451 5452 5453
	} else {
		rollback_registered(dev);
		/* Finish processing unregister after unlock */
		net_set_todo(dev);
	}
L
Linus Torvalds 已提交
5454
}
5455
EXPORT_SYMBOL(unregister_netdevice_queue);
L
Linus Torvalds 已提交
5456

5457 5458 5459 5460 5461 5462 5463 5464 5465 5466 5467 5468 5469 5470
/**
 *	unregister_netdevice_many - unregister many devices
 *	@head: list of devices
 */
void unregister_netdevice_many(struct list_head *head)
{
	struct net_device *dev;

	if (!list_empty(head)) {
		rollback_registered_many(head);
		list_for_each_entry(dev, head, unreg_list)
			net_set_todo(dev);
	}
}
5471
EXPORT_SYMBOL(unregister_netdevice_many);
5472

L
Linus Torvalds 已提交
5473 5474 5475 5476 5477
/**
 *	unregister_netdev - remove device from the kernel
 *	@dev: device
 *
 *	This function shuts down a device interface and removes it
5478
 *	from the kernel tables.
L
Linus Torvalds 已提交
5479 5480 5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491
 *
 *	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);

5492 5493 5494 5495 5496 5497 5498 5499 5500 5501 5502 5503 5504 5505 5506 5507 5508 5509 5510 5511 5512 5513 5514 5515 5516
/**
 *	dev_change_net_namespace - move device to different nethost namespace
 *	@dev: device
 *	@net: network namespace
 *	@pat: If not NULL name pattern to try if the current device name
 *	      is already taken in the destination network namespace.
 *
 *	This function shuts down a device interface and moves it
 *	to a new network namespace. On success 0 is returned, on
 *	a failure a netagive errno code is returned.
 *
 *	Callers must hold the rtnl semaphore.
 */

int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
{
	int err;

	ASSERT_RTNL();

	/* Don't allow namespace local devices to be moved. */
	err = -EINVAL;
	if (dev->features & NETIF_F_NETNS_LOCAL)
		goto out;

5517 5518 5519 5520 5521 5522 5523 5524 5525
#ifdef CONFIG_SYSFS
	/* Don't allow real devices to be moved when sysfs
	 * is enabled.
	 */
	err = -EINVAL;
	if (dev->dev.parent)
		goto out;
#endif

5526 5527 5528 5529 5530 5531 5532
	/* 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;
5533
	if (net_eq(dev_net(dev), net))
5534 5535 5536 5537 5538 5539
		goto out;

	/* Pick the destination device name, and ensure
	 * we can use it in the destination network namespace.
	 */
	err = -EEXIST;
5540
	if (__dev_get_by_name(net, dev->name)) {
5541 5542 5543
		/* We get here if we can't use the current device name */
		if (!pat)
			goto out;
5544
		if (dev_get_valid_name(net, pat, dev->name, 1))
5545 5546 5547 5548 5549 5550 5551 5552
			goto out;
	}

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

	/* If device is running close it first. */
5553
	dev_close(dev);
5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567

	/* 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);
5568
	call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev);
5569 5570 5571 5572

	/*
	 *	Flush the unicast and multicast chains
	 */
5573
	dev_uc_flush(dev);
5574
	dev_mc_flush(dev);
5575

5576 5577
	netdev_unregister_kobject(dev);

5578
	/* Actually switch the network namespace */
5579
	dev_net_set(dev, net);
5580 5581 5582 5583 5584 5585 5586 5587 5588

	/* 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;
	}

5589
	/* Fixup kobjects */
5590
	err = netdev_register_kobject(dev);
5591
	WARN_ON(err);
5592 5593 5594 5595 5596 5597 5598

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

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

5599 5600 5601 5602 5603 5604
	/*
	 *	Prevent userspace races by waiting until the network
	 *	device is fully setup before sending notifications.
	 */
	rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U);

5605 5606 5607 5608 5609
	synchronize_net();
	err = 0;
out:
	return err;
}
5610
EXPORT_SYMBOL_GPL(dev_change_net_namespace);
5611

L
Linus Torvalds 已提交
5612 5613 5614 5615 5616 5617 5618 5619 5620
static int dev_cpu_callback(struct notifier_block *nfb,
			    unsigned long action,
			    void *ocpu)
{
	struct sk_buff **list_skb;
	struct sk_buff *skb;
	unsigned int cpu, oldcpu = (unsigned long)ocpu;
	struct softnet_data *sd, *oldsd;

5621
	if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
L
Linus Torvalds 已提交
5622 5623 5624 5625 5626 5627 5628 5629 5630 5631 5632 5633 5634 5635 5636 5637
		return NOTIFY_OK;

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

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

	/* Append output queue from offline CPU. */
5638 5639 5640 5641 5642 5643
	if (oldsd->output_queue) {
		*sd->output_queue_tailp = oldsd->output_queue;
		sd->output_queue_tailp = oldsd->output_queue_tailp;
		oldsd->output_queue = NULL;
		oldsd->output_queue_tailp = &oldsd->output_queue;
	}
L
Linus Torvalds 已提交
5644 5645 5646 5647 5648

	raise_softirq_irqoff(NET_TX_SOFTIRQ);
	local_irq_enable();

	/* Process offline CPU's input_pkt_queue */
T
Tom Herbert 已提交
5649
	while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) {
L
Linus Torvalds 已提交
5650
		netif_rx(skb);
5651
		input_queue_head_add(oldsd, 1);
T
Tom Herbert 已提交
5652
	}
5653 5654
	while ((skb = __skb_dequeue(&oldsd->process_queue)))
		netif_rx(skb);
L
Linus Torvalds 已提交
5655 5656 5657 5658 5659

	return NOTIFY_OK;
}


5660
/**
5661 5662 5663 5664
 *	netdev_increment_features - increment feature set by one
 *	@all: current feature set
 *	@one: new feature set
 *	@mask: mask feature set
5665 5666
 *
 *	Computes a new feature set after adding a device with feature set
5667 5668
 *	@one to the master device with current feature set @all.  Will not
 *	enable anything that is off in @mask. Returns the new feature set.
5669
 */
5670 5671 5672 5673
unsigned long netdev_increment_features(unsigned long all, unsigned long one,
					unsigned long mask)
{
	/* If device needs checksumming, downgrade to it. */
E
Eric Dumazet 已提交
5674
	if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5675 5676 5677 5678 5679 5680 5681 5682
		all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
	else if (mask & NETIF_F_ALL_CSUM) {
		/* If one device supports v4/v6 checksumming, set for all. */
		if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
		    !(all & NETIF_F_GEN_CSUM)) {
			all &= ~NETIF_F_ALL_CSUM;
			all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
		}
5683

5684 5685 5686 5687 5688 5689
		/* If one device supports hw checksumming, set for all. */
		if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
			all &= ~NETIF_F_ALL_CSUM;
			all |= NETIF_F_HW_CSUM;
		}
	}
5690

5691
	one |= NETIF_F_ALL_CSUM;
5692

5693
	one |= all & NETIF_F_ONE_FOR_ALL;
5694
	all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO;
5695
	all |= one & mask & NETIF_F_ONE_FOR_ALL;
5696 5697 5698

	return all;
}
5699
EXPORT_SYMBOL(netdev_increment_features);
5700

5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713
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;
}

5714
/* Initialize per network namespace state */
5715
static int __net_init netdev_init(struct net *net)
5716 5717 5718
{
	INIT_LIST_HEAD(&net->dev_base_head);

5719 5720 5721
	net->dev_name_head = netdev_create_hash();
	if (net->dev_name_head == NULL)
		goto err_name;
5722

5723 5724 5725
	net->dev_index_head = netdev_create_hash();
	if (net->dev_index_head == NULL)
		goto err_idx;
5726 5727

	return 0;
5728 5729 5730 5731 5732

err_idx:
	kfree(net->dev_name_head);
err_name:
	return -ENOMEM;
5733 5734
}

5735 5736 5737 5738 5739 5740 5741 5742
/**
 *	netdev_drivername - network driver for the device
 *	@dev: network device
 *	@buffer: buffer for resulting name
 *	@len: size of buffer
 *
 *	Determine network driver for device.
 */
5743
char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5744
{
5745 5746
	const struct device_driver *driver;
	const struct device *parent;
5747 5748 5749 5750 5751 5752 5753 5754 5755 5756 5757 5758 5759 5760 5761 5762

	if (len <= 0 || !buffer)
		return buffer;
	buffer[0] = 0;

	parent = dev->dev.parent;

	if (!parent)
		return buffer;

	driver = parent->driver;
	if (driver && driver->name)
		strlcpy(buffer, driver->name, len);
	return buffer;
}

5763
static void __net_exit netdev_exit(struct net *net)
5764 5765 5766 5767 5768
{
	kfree(net->dev_name_head);
	kfree(net->dev_index_head);
}

5769
static struct pernet_operations __net_initdata netdev_net_ops = {
5770 5771 5772 5773
	.init = netdev_init,
	.exit = netdev_exit,
};

5774
static void __net_exit default_device_exit(struct net *net)
5775
{
5776
	struct net_device *dev, *aux;
5777
	/*
5778
	 * Push all migratable network devices back to the
5779 5780 5781
	 * initial network namespace
	 */
	rtnl_lock();
5782
	for_each_netdev_safe(net, dev, aux) {
5783
		int err;
5784
		char fb_name[IFNAMSIZ];
5785 5786 5787 5788 5789

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

5790 5791 5792
		/* Leave virtual devices for the generic cleanup */
		if (dev->rtnl_link_ops)
			continue;
5793

5794
		/* Push remaing network devices to init_net */
5795 5796
		snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
		err = dev_change_net_namespace(dev, &init_net, fb_name);
5797
		if (err) {
5798
			printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5799
				__func__, dev->name, err);
5800
			BUG();
5801 5802 5803 5804 5805
		}
	}
	rtnl_unlock();
}

5806 5807 5808 5809 5810 5811 5812 5813 5814 5815 5816 5817 5818 5819 5820 5821 5822 5823 5824 5825 5826 5827 5828 5829
static void __net_exit default_device_exit_batch(struct list_head *net_list)
{
	/* At exit all network devices most be removed from a network
	 * namespace.  Do this in the reverse order of registeration.
	 * Do this across as many network namespaces as possible to
	 * improve batching efficiency.
	 */
	struct net_device *dev;
	struct net *net;
	LIST_HEAD(dev_kill_list);

	rtnl_lock();
	list_for_each_entry(net, net_list, exit_list) {
		for_each_netdev_reverse(net, dev) {
			if (dev->rtnl_link_ops)
				dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
			else
				unregister_netdevice_queue(dev, &dev_kill_list);
		}
	}
	unregister_netdevice_many(&dev_kill_list);
	rtnl_unlock();
}

5830
static struct pernet_operations __net_initdata default_device_ops = {
5831
	.exit = default_device_exit,
5832
	.exit_batch = default_device_exit_batch,
5833 5834
};

L
Linus Torvalds 已提交
5835 5836 5837 5838 5839 5840 5841 5842 5843 5844 5845 5846 5847 5848 5849 5850 5851 5852 5853 5854
/*
 *	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;

5855
	if (netdev_kobject_init())
L
Linus Torvalds 已提交
5856 5857 5858
		goto out;

	INIT_LIST_HEAD(&ptype_all);
5859
	for (i = 0; i < PTYPE_HASH_SIZE; i++)
L
Linus Torvalds 已提交
5860 5861
		INIT_LIST_HEAD(&ptype_base[i]);

5862 5863
	if (register_pernet_subsys(&netdev_net_ops))
		goto out;
L
Linus Torvalds 已提交
5864 5865 5866 5867 5868

	/*
	 *	Initialise the packet receive queues.
	 */

5869
	for_each_possible_cpu(i) {
E
Eric Dumazet 已提交
5870
		struct softnet_data *sd = &per_cpu(softnet_data, i);
L
Linus Torvalds 已提交
5871

E
Eric Dumazet 已提交
5872
		skb_queue_head_init(&sd->input_pkt_queue);
5873
		skb_queue_head_init(&sd->process_queue);
E
Eric Dumazet 已提交
5874 5875
		sd->completion_queue = NULL;
		INIT_LIST_HEAD(&sd->poll_list);
5876 5877
		sd->output_queue = NULL;
		sd->output_queue_tailp = &sd->output_queue;
E
Eric Dumazet 已提交
5878
#ifdef CONFIG_RPS
E
Eric Dumazet 已提交
5879 5880 5881 5882
		sd->csd.func = rps_trigger_softirq;
		sd->csd.info = sd;
		sd->csd.flags = 0;
		sd->cpu = i;
5883
#endif
T
Tom Herbert 已提交
5884

E
Eric Dumazet 已提交
5885 5886 5887 5888
		sd->backlog.poll = process_backlog;
		sd->backlog.weight = weight_p;
		sd->backlog.gro_list = NULL;
		sd->backlog.gro_count = 0;
L
Linus Torvalds 已提交
5889 5890 5891 5892
	}

	dev_boot_phase = 0;

5893 5894 5895 5896 5897 5898 5899 5900 5901 5902 5903 5904 5905 5906 5907
	/* The loopback device is special if any other network devices
	 * is present in a network namespace the loopback device must
	 * be present. Since we now dynamically allocate and free the
	 * loopback device ensure this invariant is maintained by
	 * keeping the loopback device as the first device on the
	 * list of network devices.  Ensuring the loopback devices
	 * is the first device that appears and the last network device
	 * that disappears.
	 */
	if (register_pernet_device(&loopback_net_ops))
		goto out;

	if (register_pernet_device(&default_device_ops))
		goto out;

5908 5909
	open_softirq(NET_TX_SOFTIRQ, net_tx_action);
	open_softirq(NET_RX_SOFTIRQ, net_rx_action);
L
Linus Torvalds 已提交
5910 5911 5912 5913 5914 5915 5916 5917 5918 5919 5920

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

subsys_initcall(net_dev_init);

5921 5922
static int __init initialize_hashrnd(void)
{
T
Tom Herbert 已提交
5923
	get_random_bytes(&hashrnd, sizeof(hashrnd));
5924 5925 5926 5927 5928
	return 0;
}

late_initcall_sync(initialize_hashrnd);