2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/sched.h>
83 #include <linux/mutex.h>
84 #include <linux/string.h>
86 #include <linux/socket.h>
87 #include <linux/sockios.h>
88 #include <linux/errno.h>
89 #include <linux/interrupt.h>
90 #include <linux/if_ether.h>
91 #include <linux/netdevice.h>
92 #include <linux/etherdevice.h>
93 #include <linux/ethtool.h>
94 #include <linux/notifier.h>
95 #include <linux/skbuff.h>
96 #include <net/net_namespace.h>
98 #include <linux/rtnetlink.h>
99 #include <linux/proc_fs.h>
100 #include <linux/seq_file.h>
101 #include <linux/stat.h>
102 #include <linux/if_bridge.h>
103 #include <linux/if_macvlan.h>
105 #include <net/pkt_sched.h>
106 #include <net/checksum.h>
107 #include <linux/highmem.h>
108 #include <linux/init.h>
109 #include <linux/kmod.h>
110 #include <linux/module.h>
111 #include <linux/netpoll.h>
112 #include <linux/rcupdate.h>
113 #include <linux/delay.h>
114 #include <net/wext.h>
115 #include <net/iw_handler.h>
116 #include <asm/current.h>
117 #include <linux/audit.h>
118 #include <linux/dmaengine.h>
119 #include <linux/err.h>
120 #include <linux/ctype.h>
121 #include <linux/if_arp.h>
122 #include <linux/if_vlan.h>
123 #include <linux/ip.h>
125 #include <linux/ipv6.h>
126 #include <linux/in.h>
127 #include <linux/jhash.h>
128 #include <linux/random.h>
129 #include <trace/napi.h>
131 #include "net-sysfs.h"
133 /* Instead of increasing this, you should create a hash table. */
134 #define MAX_GRO_SKBS 8
136 /* This should be increased if a protocol with a bigger head is added. */
137 #define GRO_MAX_HEAD (MAX_HEADER + 128)
140 * The list of packet types we will receive (as opposed to discard)
141 * and the routines to invoke.
143 * Why 16. Because with 16 the only overlap we get on a hash of the
144 * low nibble of the protocol value is RARP/SNAP/X.25.
146 * NOTE: That is no longer true with the addition of VLAN tags. Not
147 * sure which should go first, but I bet it won't make much
148 * difference if we are running VLANs. The good news is that
149 * this protocol won't be in the list unless compiled in, so
150 * the average user (w/out VLANs) will not be adversely affected.
167 #define PTYPE_HASH_SIZE (16)
168 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
170 static DEFINE_SPINLOCK(ptype_lock);
171 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
172 static struct list_head ptype_all __read_mostly; /* Taps */
175 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
178 * Pure readers hold dev_base_lock for reading.
180 * Writers must hold the rtnl semaphore while they loop through the
181 * dev_base_head list, and hold dev_base_lock for writing when they do the
182 * actual updates. This allows pure readers to access the list even
183 * while a writer is preparing to update it.
185 * To put it another way, dev_base_lock is held for writing only to
186 * protect against pure readers; the rtnl semaphore provides the
187 * protection against other writers.
189 * See, for example usages, register_netdevice() and
190 * unregister_netdevice(), which must be called with the rtnl
193 DEFINE_RWLOCK(dev_base_lock);
195 EXPORT_SYMBOL(dev_base_lock);
197 #define NETDEV_HASHBITS 8
198 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
200 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
202 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
203 return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)];
206 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
208 return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)];
211 /* Device list insertion */
212 static int list_netdevice(struct net_device *dev)
214 struct net *net = dev_net(dev);
218 write_lock_bh(&dev_base_lock);
219 list_add_tail(&dev->dev_list, &net->dev_base_head);
220 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
221 hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
222 write_unlock_bh(&dev_base_lock);
226 /* Device list removal */
227 static void unlist_netdevice(struct net_device *dev)
231 /* Unlink dev from the device chain */
232 write_lock_bh(&dev_base_lock);
233 list_del(&dev->dev_list);
234 hlist_del(&dev->name_hlist);
235 hlist_del(&dev->index_hlist);
236 write_unlock_bh(&dev_base_lock);
243 static RAW_NOTIFIER_HEAD(netdev_chain);
246 * Device drivers call our routines to queue packets here. We empty the
247 * queue in the local softnet handler.
250 DEFINE_PER_CPU(struct softnet_data, softnet_data);
252 #ifdef CONFIG_LOCKDEP
254 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
255 * according to dev->type
257 static const unsigned short netdev_lock_type[] =
258 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
259 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
260 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
261 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
262 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
263 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
264 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
265 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
266 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
267 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
268 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
269 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
270 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
271 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET,
272 ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154, ARPHRD_IEEE802154_PHY,
273 ARPHRD_VOID, ARPHRD_NONE};
275 static const char *netdev_lock_name[] =
276 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
277 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
278 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
279 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
280 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
281 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
282 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
283 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
284 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
285 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
286 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
287 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
288 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
289 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET",
290 "_xmit_PHONET_PIPE", "_xmit_IEEE802154", "_xmit_IEEE802154_PHY",
291 "_xmit_VOID", "_xmit_NONE"};
293 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
294 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
296 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
300 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
301 if (netdev_lock_type[i] == dev_type)
303 /* the last key is used by default */
304 return ARRAY_SIZE(netdev_lock_type) - 1;
307 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
308 unsigned short dev_type)
312 i = netdev_lock_pos(dev_type);
313 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
314 netdev_lock_name[i]);
317 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
321 i = netdev_lock_pos(dev->type);
322 lockdep_set_class_and_name(&dev->addr_list_lock,
323 &netdev_addr_lock_key[i],
324 netdev_lock_name[i]);
327 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
328 unsigned short dev_type)
331 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
336 /*******************************************************************************
338 Protocol management and registration routines
340 *******************************************************************************/
343 * Add a protocol ID to the list. Now that the input handler is
344 * smarter we can dispense with all the messy stuff that used to be
347 * BEWARE!!! Protocol handlers, mangling input packets,
348 * MUST BE last in hash buckets and checking protocol handlers
349 * MUST start from promiscuous ptype_all chain in net_bh.
350 * It is true now, do not change it.
351 * Explanation follows: if protocol handler, mangling packet, will
352 * be the first on list, it is not able to sense, that packet
353 * is cloned and should be copied-on-write, so that it will
354 * change it and subsequent readers will get broken packet.
359 * dev_add_pack - add packet handler
360 * @pt: packet type declaration
362 * Add a protocol handler to the networking stack. The passed &packet_type
363 * is linked into kernel lists and may not be freed until it has been
364 * removed from the kernel lists.
366 * This call does not sleep therefore it can not
367 * guarantee all CPU's that are in middle of receiving packets
368 * will see the new packet type (until the next received packet).
371 void dev_add_pack(struct packet_type *pt)
375 spin_lock_bh(&ptype_lock);
376 if (pt->type == htons(ETH_P_ALL))
377 list_add_rcu(&pt->list, &ptype_all);
379 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
380 list_add_rcu(&pt->list, &ptype_base[hash]);
382 spin_unlock_bh(&ptype_lock);
386 * __dev_remove_pack - remove packet handler
387 * @pt: packet type declaration
389 * Remove a protocol handler that was previously added to the kernel
390 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
391 * from the kernel lists and can be freed or reused once this function
394 * The packet type might still be in use by receivers
395 * and must not be freed until after all the CPU's have gone
396 * through a quiescent state.
398 void __dev_remove_pack(struct packet_type *pt)
400 struct list_head *head;
401 struct packet_type *pt1;
403 spin_lock_bh(&ptype_lock);
405 if (pt->type == htons(ETH_P_ALL))
408 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
410 list_for_each_entry(pt1, head, list) {
412 list_del_rcu(&pt->list);
417 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
419 spin_unlock_bh(&ptype_lock);
422 * dev_remove_pack - remove packet handler
423 * @pt: packet type declaration
425 * Remove a protocol handler that was previously added to the kernel
426 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
427 * from the kernel lists and can be freed or reused once this function
430 * This call sleeps to guarantee that no CPU is looking at the packet
433 void dev_remove_pack(struct packet_type *pt)
435 __dev_remove_pack(pt);
440 /******************************************************************************
442 Device Boot-time Settings Routines
444 *******************************************************************************/
446 /* Boot time configuration table */
447 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
450 * netdev_boot_setup_add - add new setup entry
451 * @name: name of the device
452 * @map: configured settings for the device
454 * Adds new setup entry to the dev_boot_setup list. The function
455 * returns 0 on error and 1 on success. This is a generic routine to
458 static int netdev_boot_setup_add(char *name, struct ifmap *map)
460 struct netdev_boot_setup *s;
464 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
465 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
466 memset(s[i].name, 0, sizeof(s[i].name));
467 strlcpy(s[i].name, name, IFNAMSIZ);
468 memcpy(&s[i].map, map, sizeof(s[i].map));
473 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
477 * netdev_boot_setup_check - check boot time settings
478 * @dev: the netdevice
480 * Check boot time settings for the device.
481 * The found settings are set for the device to be used
482 * later in the device probing.
483 * Returns 0 if no settings found, 1 if they are.
485 int netdev_boot_setup_check(struct net_device *dev)
487 struct netdev_boot_setup *s = dev_boot_setup;
490 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
491 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
492 !strcmp(dev->name, s[i].name)) {
493 dev->irq = s[i].map.irq;
494 dev->base_addr = s[i].map.base_addr;
495 dev->mem_start = s[i].map.mem_start;
496 dev->mem_end = s[i].map.mem_end;
505 * netdev_boot_base - get address from boot time settings
506 * @prefix: prefix for network device
507 * @unit: id for network device
509 * Check boot time settings for the base address of device.
510 * The found settings are set for the device to be used
511 * later in the device probing.
512 * Returns 0 if no settings found.
514 unsigned long netdev_boot_base(const char *prefix, int unit)
516 const struct netdev_boot_setup *s = dev_boot_setup;
520 sprintf(name, "%s%d", prefix, unit);
523 * If device already registered then return base of 1
524 * to indicate not to probe for this interface
526 if (__dev_get_by_name(&init_net, name))
529 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
530 if (!strcmp(name, s[i].name))
531 return s[i].map.base_addr;
536 * Saves at boot time configured settings for any netdevice.
538 int __init netdev_boot_setup(char *str)
543 str = get_options(str, ARRAY_SIZE(ints), ints);
548 memset(&map, 0, sizeof(map));
552 map.base_addr = ints[2];
554 map.mem_start = ints[3];
556 map.mem_end = ints[4];
558 /* Add new entry to the list */
559 return netdev_boot_setup_add(str, &map);
562 __setup("netdev=", netdev_boot_setup);
564 /*******************************************************************************
566 Device Interface Subroutines
568 *******************************************************************************/
571 * __dev_get_by_name - find a device by its name
572 * @net: the applicable net namespace
573 * @name: name to find
575 * Find an interface by name. Must be called under RTNL semaphore
576 * or @dev_base_lock. If the name is found a pointer to the device
577 * is returned. If the name is not found then %NULL is returned. The
578 * reference counters are not incremented so the caller must be
579 * careful with locks.
582 struct net_device *__dev_get_by_name(struct net *net, const char *name)
584 struct hlist_node *p;
586 hlist_for_each(p, dev_name_hash(net, name)) {
587 struct net_device *dev
588 = hlist_entry(p, struct net_device, name_hlist);
589 if (!strncmp(dev->name, name, IFNAMSIZ))
596 * dev_get_by_name - find a device by its name
597 * @net: the applicable net namespace
598 * @name: name to find
600 * Find an interface by name. This can be called from any
601 * context and does its own locking. The returned handle has
602 * the usage count incremented and the caller must use dev_put() to
603 * release it when it is no longer needed. %NULL is returned if no
604 * matching device is found.
607 struct net_device *dev_get_by_name(struct net *net, const char *name)
609 struct net_device *dev;
611 read_lock(&dev_base_lock);
612 dev = __dev_get_by_name(net, name);
615 read_unlock(&dev_base_lock);
620 * __dev_get_by_index - find a device by its ifindex
621 * @net: the applicable net namespace
622 * @ifindex: index of device
624 * Search for an interface by index. Returns %NULL if the device
625 * is not found or a pointer to the device. The device has not
626 * had its reference counter increased so the caller must be careful
627 * about locking. The caller must hold either the RTNL semaphore
631 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
633 struct hlist_node *p;
635 hlist_for_each(p, dev_index_hash(net, ifindex)) {
636 struct net_device *dev
637 = hlist_entry(p, struct net_device, index_hlist);
638 if (dev->ifindex == ifindex)
646 * dev_get_by_index - find a device by its ifindex
647 * @net: the applicable net namespace
648 * @ifindex: index of device
650 * Search for an interface by index. Returns NULL if the device
651 * is not found or a pointer to the device. The device returned has
652 * had a reference added and the pointer is safe until the user calls
653 * dev_put to indicate they have finished with it.
656 struct net_device *dev_get_by_index(struct net *net, int ifindex)
658 struct net_device *dev;
660 read_lock(&dev_base_lock);
661 dev = __dev_get_by_index(net, ifindex);
664 read_unlock(&dev_base_lock);
669 * dev_getbyhwaddr - find a device by its hardware address
670 * @net: the applicable net namespace
671 * @type: media type of device
672 * @ha: hardware address
674 * Search for an interface by MAC address. Returns NULL if the device
675 * is not found or a pointer to the device. The caller must hold the
676 * rtnl semaphore. The returned device has not had its ref count increased
677 * and the caller must therefore be careful about locking
680 * If the API was consistent this would be __dev_get_by_hwaddr
683 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
685 struct net_device *dev;
689 for_each_netdev(net, dev)
690 if (dev->type == type &&
691 !memcmp(dev->dev_addr, ha, dev->addr_len))
697 EXPORT_SYMBOL(dev_getbyhwaddr);
699 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
701 struct net_device *dev;
704 for_each_netdev(net, dev)
705 if (dev->type == type)
711 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
713 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
715 struct net_device *dev;
718 dev = __dev_getfirstbyhwtype(net, type);
725 EXPORT_SYMBOL(dev_getfirstbyhwtype);
728 * dev_get_by_flags - find any device with given flags
729 * @net: the applicable net namespace
730 * @if_flags: IFF_* values
731 * @mask: bitmask of bits in if_flags to check
733 * Search for any interface with the given flags. Returns NULL if a device
734 * is not found or a pointer to the device. The device returned has
735 * had a reference added and the pointer is safe until the user calls
736 * dev_put to indicate they have finished with it.
739 struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask)
741 struct net_device *dev, *ret;
744 read_lock(&dev_base_lock);
745 for_each_netdev(net, dev) {
746 if (((dev->flags ^ if_flags) & mask) == 0) {
752 read_unlock(&dev_base_lock);
757 * dev_valid_name - check if name is okay for network device
760 * Network device names need to be valid file names to
761 * to allow sysfs to work. We also disallow any kind of
764 int dev_valid_name(const char *name)
768 if (strlen(name) >= IFNAMSIZ)
770 if (!strcmp(name, ".") || !strcmp(name, ".."))
774 if (*name == '/' || isspace(*name))
782 * __dev_alloc_name - allocate a name for a device
783 * @net: network namespace to allocate the device name in
784 * @name: name format string
785 * @buf: scratch buffer and result name string
787 * Passed a format string - eg "lt%d" it will try and find a suitable
788 * id. It scans list of devices to build up a free map, then chooses
789 * the first empty slot. The caller must hold the dev_base or rtnl lock
790 * while allocating the name and adding the device in order to avoid
792 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
793 * Returns the number of the unit assigned or a negative errno code.
796 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
800 const int max_netdevices = 8*PAGE_SIZE;
801 unsigned long *inuse;
802 struct net_device *d;
804 p = strnchr(name, IFNAMSIZ-1, '%');
807 * Verify the string as this thing may have come from
808 * the user. There must be either one "%d" and no other "%"
811 if (p[1] != 'd' || strchr(p + 2, '%'))
814 /* Use one page as a bit array of possible slots */
815 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
819 for_each_netdev(net, d) {
820 if (!sscanf(d->name, name, &i))
822 if (i < 0 || i >= max_netdevices)
825 /* avoid cases where sscanf is not exact inverse of printf */
826 snprintf(buf, IFNAMSIZ, name, i);
827 if (!strncmp(buf, d->name, IFNAMSIZ))
831 i = find_first_zero_bit(inuse, max_netdevices);
832 free_page((unsigned long) inuse);
835 snprintf(buf, IFNAMSIZ, name, i);
836 if (!__dev_get_by_name(net, buf))
839 /* It is possible to run out of possible slots
840 * when the name is long and there isn't enough space left
841 * for the digits, or if all bits are used.
847 * dev_alloc_name - allocate a name for a device
849 * @name: name format string
851 * Passed a format string - eg "lt%d" it will try and find a suitable
852 * id. It scans list of devices to build up a free map, then chooses
853 * the first empty slot. The caller must hold the dev_base or rtnl lock
854 * while allocating the name and adding the device in order to avoid
856 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
857 * Returns the number of the unit assigned or a negative errno code.
860 int dev_alloc_name(struct net_device *dev, const char *name)
866 BUG_ON(!dev_net(dev));
868 ret = __dev_alloc_name(net, name, buf);
870 strlcpy(dev->name, buf, IFNAMSIZ);
876 * dev_change_name - change name of a device
878 * @newname: name (or format string) must be at least IFNAMSIZ
880 * Change name of a device, can pass format strings "eth%d".
883 int dev_change_name(struct net_device *dev, const char *newname)
885 char oldname[IFNAMSIZ];
891 BUG_ON(!dev_net(dev));
894 if (dev->flags & IFF_UP)
897 if (!dev_valid_name(newname))
900 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
903 memcpy(oldname, dev->name, IFNAMSIZ);
905 if (strchr(newname, '%')) {
906 err = dev_alloc_name(dev, newname);
910 else if (__dev_get_by_name(net, newname))
913 strlcpy(dev->name, newname, IFNAMSIZ);
916 /* For now only devices in the initial network namespace
919 if (net == &init_net) {
920 ret = device_rename(&dev->dev, dev->name);
922 memcpy(dev->name, oldname, IFNAMSIZ);
927 write_lock_bh(&dev_base_lock);
928 hlist_del(&dev->name_hlist);
929 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
930 write_unlock_bh(&dev_base_lock);
932 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
933 ret = notifier_to_errno(ret);
938 "%s: name change rollback failed: %d.\n",
942 memcpy(dev->name, oldname, IFNAMSIZ);
951 * dev_set_alias - change ifalias of a device
953 * @alias: name up to IFALIASZ
954 * @len: limit of bytes to copy from info
956 * Set ifalias for a device,
958 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
973 dev->ifalias = krealloc(dev->ifalias, len+1, GFP_KERNEL);
977 strlcpy(dev->ifalias, alias, len+1);
983 * netdev_features_change - device changes features
984 * @dev: device to cause notification
986 * Called to indicate a device has changed features.
988 void netdev_features_change(struct net_device *dev)
990 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
992 EXPORT_SYMBOL(netdev_features_change);
995 * netdev_state_change - device changes state
996 * @dev: device to cause notification
998 * Called to indicate a device has changed state. This function calls
999 * the notifier chains for netdev_chain and sends a NEWLINK message
1000 * to the routing socket.
1002 void netdev_state_change(struct net_device *dev)
1004 if (dev->flags & IFF_UP) {
1005 call_netdevice_notifiers(NETDEV_CHANGE, dev);
1006 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
1010 void netdev_bonding_change(struct net_device *dev)
1012 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev);
1014 EXPORT_SYMBOL(netdev_bonding_change);
1017 * dev_load - load a network module
1018 * @net: the applicable net namespace
1019 * @name: name of interface
1021 * If a network interface is not present and the process has suitable
1022 * privileges this function loads the module. If module loading is not
1023 * available in this kernel then it becomes a nop.
1026 void dev_load(struct net *net, const char *name)
1028 struct net_device *dev;
1030 read_lock(&dev_base_lock);
1031 dev = __dev_get_by_name(net, name);
1032 read_unlock(&dev_base_lock);
1034 if (!dev && capable(CAP_SYS_MODULE))
1035 request_module("%s", name);
1039 * dev_open - prepare an interface for use.
1040 * @dev: device to open
1042 * Takes a device from down to up state. The device's private open
1043 * function is invoked and then the multicast lists are loaded. Finally
1044 * the device is moved into the up state and a %NETDEV_UP message is
1045 * sent to the netdev notifier chain.
1047 * Calling this function on an active interface is a nop. On a failure
1048 * a negative errno code is returned.
1050 int dev_open(struct net_device *dev)
1052 const struct net_device_ops *ops = dev->netdev_ops;
1061 if (dev->flags & IFF_UP)
1065 * Is it even present?
1067 if (!netif_device_present(dev))
1070 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1071 ret = notifier_to_errno(ret);
1076 * Call device private open method
1078 set_bit(__LINK_STATE_START, &dev->state);
1080 if (ops->ndo_validate_addr)
1081 ret = ops->ndo_validate_addr(dev);
1083 if (!ret && ops->ndo_open)
1084 ret = ops->ndo_open(dev);
1087 * If it went open OK then:
1091 clear_bit(__LINK_STATE_START, &dev->state);
1096 dev->flags |= IFF_UP;
1101 net_dmaengine_get();
1104 * Initialize multicasting status
1106 dev_set_rx_mode(dev);
1109 * Wakeup transmit queue engine
1114 * ... and announce new interface.
1116 call_netdevice_notifiers(NETDEV_UP, dev);
1123 * dev_close - shutdown an interface.
1124 * @dev: device to shutdown
1126 * This function moves an active device into down state. A
1127 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1128 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1131 int dev_close(struct net_device *dev)
1133 const struct net_device_ops *ops = dev->netdev_ops;
1138 if (!(dev->flags & IFF_UP))
1142 * Tell people we are going down, so that they can
1143 * prepare to death, when device is still operating.
1145 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1147 clear_bit(__LINK_STATE_START, &dev->state);
1149 /* Synchronize to scheduled poll. We cannot touch poll list,
1150 * it can be even on different cpu. So just clear netif_running().
1152 * dev->stop() will invoke napi_disable() on all of it's
1153 * napi_struct instances on this device.
1155 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1157 dev_deactivate(dev);
1160 * Call the device specific close. This cannot fail.
1161 * Only if device is UP
1163 * We allow it to be called even after a DETACH hot-plug
1170 * Device is now down.
1173 dev->flags &= ~IFF_UP;
1176 * Tell people we are down
1178 call_netdevice_notifiers(NETDEV_DOWN, dev);
1183 net_dmaengine_put();
1190 * dev_disable_lro - disable Large Receive Offload on a device
1193 * Disable Large Receive Offload (LRO) on a net device. Must be
1194 * called under RTNL. This is needed if received packets may be
1195 * forwarded to another interface.
1197 void dev_disable_lro(struct net_device *dev)
1199 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1200 dev->ethtool_ops->set_flags) {
1201 u32 flags = dev->ethtool_ops->get_flags(dev);
1202 if (flags & ETH_FLAG_LRO) {
1203 flags &= ~ETH_FLAG_LRO;
1204 dev->ethtool_ops->set_flags(dev, flags);
1207 WARN_ON(dev->features & NETIF_F_LRO);
1209 EXPORT_SYMBOL(dev_disable_lro);
1212 static int dev_boot_phase = 1;
1215 * Device change register/unregister. These are not inline or static
1216 * as we export them to the world.
1220 * register_netdevice_notifier - register a network notifier block
1223 * Register a notifier to be called when network device events occur.
1224 * The notifier passed is linked into the kernel structures and must
1225 * not be reused until it has been unregistered. A negative errno code
1226 * is returned on a failure.
1228 * When registered all registration and up events are replayed
1229 * to the new notifier to allow device to have a race free
1230 * view of the network device list.
1233 int register_netdevice_notifier(struct notifier_block *nb)
1235 struct net_device *dev;
1236 struct net_device *last;
1241 err = raw_notifier_chain_register(&netdev_chain, nb);
1247 for_each_netdev(net, dev) {
1248 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1249 err = notifier_to_errno(err);
1253 if (!(dev->flags & IFF_UP))
1256 nb->notifier_call(nb, NETDEV_UP, dev);
1267 for_each_netdev(net, dev) {
1271 if (dev->flags & IFF_UP) {
1272 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1273 nb->notifier_call(nb, NETDEV_DOWN, dev);
1275 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1279 raw_notifier_chain_unregister(&netdev_chain, nb);
1284 * unregister_netdevice_notifier - unregister a network notifier block
1287 * Unregister a notifier previously registered by
1288 * register_netdevice_notifier(). The notifier is unlinked into the
1289 * kernel structures and may then be reused. A negative errno code
1290 * is returned on a failure.
1293 int unregister_netdevice_notifier(struct notifier_block *nb)
1298 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1304 * call_netdevice_notifiers - call all network notifier blocks
1305 * @val: value passed unmodified to notifier function
1306 * @dev: net_device pointer passed unmodified to notifier function
1308 * Call all network notifier blocks. Parameters and return value
1309 * are as for raw_notifier_call_chain().
1312 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1314 return raw_notifier_call_chain(&netdev_chain, val, dev);
1317 /* When > 0 there are consumers of rx skb time stamps */
1318 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1320 void net_enable_timestamp(void)
1322 atomic_inc(&netstamp_needed);
1325 void net_disable_timestamp(void)
1327 atomic_dec(&netstamp_needed);
1330 static inline void net_timestamp(struct sk_buff *skb)
1332 if (atomic_read(&netstamp_needed))
1333 __net_timestamp(skb);
1335 skb->tstamp.tv64 = 0;
1339 * Support routine. Sends outgoing frames to any network
1340 * taps currently in use.
1343 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1345 struct packet_type *ptype;
1347 #ifdef CONFIG_NET_CLS_ACT
1348 if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
1355 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1356 /* Never send packets back to the socket
1357 * they originated from - MvS (miquels@drinkel.ow.org)
1359 if ((ptype->dev == dev || !ptype->dev) &&
1360 (ptype->af_packet_priv == NULL ||
1361 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1362 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1366 /* skb->nh should be correctly
1367 set by sender, so that the second statement is
1368 just protection against buggy protocols.
1370 skb_reset_mac_header(skb2);
1372 if (skb_network_header(skb2) < skb2->data ||
1373 skb2->network_header > skb2->tail) {
1374 if (net_ratelimit())
1375 printk(KERN_CRIT "protocol %04x is "
1377 skb2->protocol, dev->name);
1378 skb_reset_network_header(skb2);
1381 skb2->transport_header = skb2->network_header;
1382 skb2->pkt_type = PACKET_OUTGOING;
1383 ptype->func(skb2, skb->dev, ptype, skb->dev);
1390 static inline void __netif_reschedule(struct Qdisc *q)
1392 struct softnet_data *sd;
1393 unsigned long flags;
1395 local_irq_save(flags);
1396 sd = &__get_cpu_var(softnet_data);
1397 q->next_sched = sd->output_queue;
1398 sd->output_queue = q;
1399 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1400 local_irq_restore(flags);
1403 void __netif_schedule(struct Qdisc *q)
1405 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
1406 __netif_reschedule(q);
1408 EXPORT_SYMBOL(__netif_schedule);
1410 void dev_kfree_skb_irq(struct sk_buff *skb)
1412 if (atomic_dec_and_test(&skb->users)) {
1413 struct softnet_data *sd;
1414 unsigned long flags;
1416 local_irq_save(flags);
1417 sd = &__get_cpu_var(softnet_data);
1418 skb->next = sd->completion_queue;
1419 sd->completion_queue = skb;
1420 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1421 local_irq_restore(flags);
1424 EXPORT_SYMBOL(dev_kfree_skb_irq);
1426 void dev_kfree_skb_any(struct sk_buff *skb)
1428 if (in_irq() || irqs_disabled())
1429 dev_kfree_skb_irq(skb);
1433 EXPORT_SYMBOL(dev_kfree_skb_any);
1437 * netif_device_detach - mark device as removed
1438 * @dev: network device
1440 * Mark device as removed from system and therefore no longer available.
1442 void netif_device_detach(struct net_device *dev)
1444 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1445 netif_running(dev)) {
1446 netif_tx_stop_all_queues(dev);
1449 EXPORT_SYMBOL(netif_device_detach);
1452 * netif_device_attach - mark device as attached
1453 * @dev: network device
1455 * Mark device as attached from system and restart if needed.
1457 void netif_device_attach(struct net_device *dev)
1459 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1460 netif_running(dev)) {
1461 netif_tx_wake_all_queues(dev);
1462 __netdev_watchdog_up(dev);
1465 EXPORT_SYMBOL(netif_device_attach);
1467 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1469 return ((features & NETIF_F_GEN_CSUM) ||
1470 ((features & NETIF_F_IP_CSUM) &&
1471 protocol == htons(ETH_P_IP)) ||
1472 ((features & NETIF_F_IPV6_CSUM) &&
1473 protocol == htons(ETH_P_IPV6)) ||
1474 ((features & NETIF_F_FCOE_CRC) &&
1475 protocol == htons(ETH_P_FCOE)));
1478 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1480 if (can_checksum_protocol(dev->features, skb->protocol))
1483 if (skb->protocol == htons(ETH_P_8021Q)) {
1484 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1485 if (can_checksum_protocol(dev->features & dev->vlan_features,
1486 veh->h_vlan_encapsulated_proto))
1494 * Invalidate hardware checksum when packet is to be mangled, and
1495 * complete checksum manually on outgoing path.
1497 int skb_checksum_help(struct sk_buff *skb)
1500 int ret = 0, offset;
1502 if (skb->ip_summed == CHECKSUM_COMPLETE)
1503 goto out_set_summed;
1505 if (unlikely(skb_shinfo(skb)->gso_size)) {
1506 /* Let GSO fix up the checksum. */
1507 goto out_set_summed;
1510 offset = skb->csum_start - skb_headroom(skb);
1511 BUG_ON(offset >= skb_headlen(skb));
1512 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1514 offset += skb->csum_offset;
1515 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1517 if (skb_cloned(skb) &&
1518 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1519 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1524 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1526 skb->ip_summed = CHECKSUM_NONE;
1532 * skb_gso_segment - Perform segmentation on skb.
1533 * @skb: buffer to segment
1534 * @features: features for the output path (see dev->features)
1536 * This function segments the given skb and returns a list of segments.
1538 * It may return NULL if the skb requires no segmentation. This is
1539 * only possible when GSO is used for verifying header integrity.
1541 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1543 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1544 struct packet_type *ptype;
1545 __be16 type = skb->protocol;
1548 skb_reset_mac_header(skb);
1549 skb->mac_len = skb->network_header - skb->mac_header;
1550 __skb_pull(skb, skb->mac_len);
1552 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1553 struct net_device *dev = skb->dev;
1554 struct ethtool_drvinfo info = {};
1556 if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo)
1557 dev->ethtool_ops->get_drvinfo(dev, &info);
1559 WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d "
1561 info.driver, dev ? dev->features : 0L,
1562 skb->sk ? skb->sk->sk_route_caps : 0L,
1563 skb->len, skb->data_len, skb->ip_summed);
1565 if (skb_header_cloned(skb) &&
1566 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1567 return ERR_PTR(err);
1571 list_for_each_entry_rcu(ptype,
1572 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1573 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1574 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1575 err = ptype->gso_send_check(skb);
1576 segs = ERR_PTR(err);
1577 if (err || skb_gso_ok(skb, features))
1579 __skb_push(skb, (skb->data -
1580 skb_network_header(skb)));
1582 segs = ptype->gso_segment(skb, features);
1588 __skb_push(skb, skb->data - skb_mac_header(skb));
1593 EXPORT_SYMBOL(skb_gso_segment);
1595 /* Take action when hardware reception checksum errors are detected. */
1597 void netdev_rx_csum_fault(struct net_device *dev)
1599 if (net_ratelimit()) {
1600 printk(KERN_ERR "%s: hw csum failure.\n",
1601 dev ? dev->name : "<unknown>");
1605 EXPORT_SYMBOL(netdev_rx_csum_fault);
1608 /* Actually, we should eliminate this check as soon as we know, that:
1609 * 1. IOMMU is present and allows to map all the memory.
1610 * 2. No high memory really exists on this machine.
1613 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1615 #ifdef CONFIG_HIGHMEM
1618 if (dev->features & NETIF_F_HIGHDMA)
1621 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1622 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1630 void (*destructor)(struct sk_buff *skb);
1633 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1635 static void dev_gso_skb_destructor(struct sk_buff *skb)
1637 struct dev_gso_cb *cb;
1640 struct sk_buff *nskb = skb->next;
1642 skb->next = nskb->next;
1645 } while (skb->next);
1647 cb = DEV_GSO_CB(skb);
1649 cb->destructor(skb);
1653 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1654 * @skb: buffer to segment
1656 * This function segments the given skb and stores the list of segments
1659 static int dev_gso_segment(struct sk_buff *skb)
1661 struct net_device *dev = skb->dev;
1662 struct sk_buff *segs;
1663 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1666 segs = skb_gso_segment(skb, features);
1668 /* Verifying header integrity only. */
1673 return PTR_ERR(segs);
1676 DEV_GSO_CB(skb)->destructor = skb->destructor;
1677 skb->destructor = dev_gso_skb_destructor;
1682 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev,
1683 struct netdev_queue *txq)
1685 const struct net_device_ops *ops = dev->netdev_ops;
1688 if (likely(!skb->next)) {
1689 if (!list_empty(&ptype_all))
1690 dev_queue_xmit_nit(skb, dev);
1692 if (netif_needs_gso(dev, skb)) {
1693 if (unlikely(dev_gso_segment(skb)))
1700 * If device doesnt need skb->dst, release it right now while
1701 * its hot in this cpu cache
1703 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
1706 rc = ops->ndo_start_xmit(skb, dev);
1708 txq_trans_update(txq);
1710 * TODO: if skb_orphan() was called by
1711 * dev->hard_start_xmit() (for example, the unmodified
1712 * igb driver does that; bnx2 doesn't), then
1713 * skb_tx_software_timestamp() will be unable to send
1714 * back the time stamp.
1716 * How can this be prevented? Always create another
1717 * reference to the socket before calling
1718 * dev->hard_start_xmit()? Prevent that skb_orphan()
1719 * does anything in dev->hard_start_xmit() by clearing
1720 * the skb destructor before the call and restoring it
1721 * afterwards, then doing the skb_orphan() ourselves?
1728 struct sk_buff *nskb = skb->next;
1730 skb->next = nskb->next;
1732 rc = ops->ndo_start_xmit(nskb, dev);
1734 nskb->next = skb->next;
1738 txq_trans_update(txq);
1739 if (unlikely(netif_tx_queue_stopped(txq) && skb->next))
1740 return NETDEV_TX_BUSY;
1741 } while (skb->next);
1743 skb->destructor = DEV_GSO_CB(skb)->destructor;
1750 static u32 skb_tx_hashrnd;
1752 u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb)
1756 if (skb_rx_queue_recorded(skb)) {
1757 hash = skb_get_rx_queue(skb);
1758 while (unlikely (hash >= dev->real_num_tx_queues))
1759 hash -= dev->real_num_tx_queues;
1763 if (skb->sk && skb->sk->sk_hash)
1764 hash = skb->sk->sk_hash;
1766 hash = skb->protocol;
1768 hash = jhash_1word(hash, skb_tx_hashrnd);
1770 return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32);
1772 EXPORT_SYMBOL(skb_tx_hash);
1774 static struct netdev_queue *dev_pick_tx(struct net_device *dev,
1775 struct sk_buff *skb)
1777 const struct net_device_ops *ops = dev->netdev_ops;
1778 u16 queue_index = 0;
1780 if (ops->ndo_select_queue)
1781 queue_index = ops->ndo_select_queue(dev, skb);
1782 else if (dev->real_num_tx_queues > 1)
1783 queue_index = skb_tx_hash(dev, skb);
1785 skb_set_queue_mapping(skb, queue_index);
1786 return netdev_get_tx_queue(dev, queue_index);
1790 * dev_queue_xmit - transmit a buffer
1791 * @skb: buffer to transmit
1793 * Queue a buffer for transmission to a network device. The caller must
1794 * have set the device and priority and built the buffer before calling
1795 * this function. The function can be called from an interrupt.
1797 * A negative errno code is returned on a failure. A success does not
1798 * guarantee the frame will be transmitted as it may be dropped due
1799 * to congestion or traffic shaping.
1801 * -----------------------------------------------------------------------------------
1802 * I notice this method can also return errors from the queue disciplines,
1803 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1806 * Regardless of the return value, the skb is consumed, so it is currently
1807 * difficult to retry a send to this method. (You can bump the ref count
1808 * before sending to hold a reference for retry if you are careful.)
1810 * When calling this method, interrupts MUST be enabled. This is because
1811 * the BH enable code must have IRQs enabled so that it will not deadlock.
1814 int dev_queue_xmit(struct sk_buff *skb)
1816 struct net_device *dev = skb->dev;
1817 struct netdev_queue *txq;
1821 /* GSO will handle the following emulations directly. */
1822 if (netif_needs_gso(dev, skb))
1825 if (skb_has_frags(skb) &&
1826 !(dev->features & NETIF_F_FRAGLIST) &&
1827 __skb_linearize(skb))
1830 /* Fragmented skb is linearized if device does not support SG,
1831 * or if at least one of fragments is in highmem and device
1832 * does not support DMA from it.
1834 if (skb_shinfo(skb)->nr_frags &&
1835 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1836 __skb_linearize(skb))
1839 /* If packet is not checksummed and device does not support
1840 * checksumming for this protocol, complete checksumming here.
1842 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1843 skb_set_transport_header(skb, skb->csum_start -
1845 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
1850 /* Disable soft irqs for various locks below. Also
1851 * stops preemption for RCU.
1855 txq = dev_pick_tx(dev, skb);
1856 q = rcu_dereference(txq->qdisc);
1858 #ifdef CONFIG_NET_CLS_ACT
1859 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1862 spinlock_t *root_lock = qdisc_lock(q);
1864 spin_lock(root_lock);
1866 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
1870 rc = qdisc_enqueue_root(skb, q);
1873 spin_unlock(root_lock);
1878 /* The device has no queue. Common case for software devices:
1879 loopback, all the sorts of tunnels...
1881 Really, it is unlikely that netif_tx_lock protection is necessary
1882 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1884 However, it is possible, that they rely on protection
1887 Check this and shot the lock. It is not prone from deadlocks.
1888 Either shot noqueue qdisc, it is even simpler 8)
1890 if (dev->flags & IFF_UP) {
1891 int cpu = smp_processor_id(); /* ok because BHs are off */
1893 if (txq->xmit_lock_owner != cpu) {
1895 HARD_TX_LOCK(dev, txq, cpu);
1897 if (!netif_tx_queue_stopped(txq)) {
1899 if (!dev_hard_start_xmit(skb, dev, txq)) {
1900 HARD_TX_UNLOCK(dev, txq);
1904 HARD_TX_UNLOCK(dev, txq);
1905 if (net_ratelimit())
1906 printk(KERN_CRIT "Virtual device %s asks to "
1907 "queue packet!\n", dev->name);
1909 /* Recursion is detected! It is possible,
1911 if (net_ratelimit())
1912 printk(KERN_CRIT "Dead loop on virtual device "
1913 "%s, fix it urgently!\n", dev->name);
1918 rcu_read_unlock_bh();
1924 rcu_read_unlock_bh();
1929 /*=======================================================================
1931 =======================================================================*/
1933 int netdev_max_backlog __read_mostly = 1000;
1934 int netdev_budget __read_mostly = 300;
1935 int weight_p __read_mostly = 64; /* old backlog weight */
1937 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1941 * netif_rx - post buffer to the network code
1942 * @skb: buffer to post
1944 * This function receives a packet from a device driver and queues it for
1945 * the upper (protocol) levels to process. It always succeeds. The buffer
1946 * may be dropped during processing for congestion control or by the
1950 * NET_RX_SUCCESS (no congestion)
1951 * NET_RX_DROP (packet was dropped)
1955 int netif_rx(struct sk_buff *skb)
1957 struct softnet_data *queue;
1958 unsigned long flags;
1960 /* if netpoll wants it, pretend we never saw it */
1961 if (netpoll_rx(skb))
1964 if (!skb->tstamp.tv64)
1968 * The code is rearranged so that the path is the most
1969 * short when CPU is congested, but is still operating.
1971 local_irq_save(flags);
1972 queue = &__get_cpu_var(softnet_data);
1974 __get_cpu_var(netdev_rx_stat).total++;
1975 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1976 if (queue->input_pkt_queue.qlen) {
1978 __skb_queue_tail(&queue->input_pkt_queue, skb);
1979 local_irq_restore(flags);
1980 return NET_RX_SUCCESS;
1983 napi_schedule(&queue->backlog);
1987 __get_cpu_var(netdev_rx_stat).dropped++;
1988 local_irq_restore(flags);
1994 int netif_rx_ni(struct sk_buff *skb)
1999 err = netif_rx(skb);
2000 if (local_softirq_pending())
2007 EXPORT_SYMBOL(netif_rx_ni);
2009 static void net_tx_action(struct softirq_action *h)
2011 struct softnet_data *sd = &__get_cpu_var(softnet_data);
2013 if (sd->completion_queue) {
2014 struct sk_buff *clist;
2016 local_irq_disable();
2017 clist = sd->completion_queue;
2018 sd->completion_queue = NULL;
2022 struct sk_buff *skb = clist;
2023 clist = clist->next;
2025 WARN_ON(atomic_read(&skb->users));
2030 if (sd->output_queue) {
2033 local_irq_disable();
2034 head = sd->output_queue;
2035 sd->output_queue = NULL;
2039 struct Qdisc *q = head;
2040 spinlock_t *root_lock;
2042 head = head->next_sched;
2044 root_lock = qdisc_lock(q);
2045 if (spin_trylock(root_lock)) {
2046 smp_mb__before_clear_bit();
2047 clear_bit(__QDISC_STATE_SCHED,
2050 spin_unlock(root_lock);
2052 if (!test_bit(__QDISC_STATE_DEACTIVATED,
2054 __netif_reschedule(q);
2056 smp_mb__before_clear_bit();
2057 clear_bit(__QDISC_STATE_SCHED,
2065 static inline int deliver_skb(struct sk_buff *skb,
2066 struct packet_type *pt_prev,
2067 struct net_device *orig_dev)
2069 atomic_inc(&skb->users);
2070 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2073 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
2074 /* These hooks defined here for ATM */
2076 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
2077 unsigned char *addr);
2078 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
2081 * If bridge module is loaded call bridging hook.
2082 * returns NULL if packet was consumed.
2084 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
2085 struct sk_buff *skb) __read_mostly;
2086 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
2087 struct packet_type **pt_prev, int *ret,
2088 struct net_device *orig_dev)
2090 struct net_bridge_port *port;
2092 if (skb->pkt_type == PACKET_LOOPBACK ||
2093 (port = rcu_dereference(skb->dev->br_port)) == NULL)
2097 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2101 return br_handle_frame_hook(port, skb);
2104 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
2107 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
2108 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
2109 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
2111 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
2112 struct packet_type **pt_prev,
2114 struct net_device *orig_dev)
2116 if (skb->dev->macvlan_port == NULL)
2120 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2123 return macvlan_handle_frame_hook(skb);
2126 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2129 #ifdef CONFIG_NET_CLS_ACT
2130 /* TODO: Maybe we should just force sch_ingress to be compiled in
2131 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2132 * a compare and 2 stores extra right now if we dont have it on
2133 * but have CONFIG_NET_CLS_ACT
2134 * NOTE: This doesnt stop any functionality; if you dont have
2135 * the ingress scheduler, you just cant add policies on ingress.
2138 static int ing_filter(struct sk_buff *skb)
2140 struct net_device *dev = skb->dev;
2141 u32 ttl = G_TC_RTTL(skb->tc_verd);
2142 struct netdev_queue *rxq;
2143 int result = TC_ACT_OK;
2146 if (MAX_RED_LOOP < ttl++) {
2148 "Redir loop detected Dropping packet (%d->%d)\n",
2149 skb->iif, dev->ifindex);
2153 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2154 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2156 rxq = &dev->rx_queue;
2159 if (q != &noop_qdisc) {
2160 spin_lock(qdisc_lock(q));
2161 if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state)))
2162 result = qdisc_enqueue_root(skb, q);
2163 spin_unlock(qdisc_lock(q));
2169 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2170 struct packet_type **pt_prev,
2171 int *ret, struct net_device *orig_dev)
2173 if (skb->dev->rx_queue.qdisc == &noop_qdisc)
2177 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2180 /* Huh? Why does turning on AF_PACKET affect this? */
2181 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2184 switch (ing_filter(skb)) {
2198 * netif_nit_deliver - deliver received packets to network taps
2201 * This function is used to deliver incoming packets to network
2202 * taps. It should be used when the normal netif_receive_skb path
2203 * is bypassed, for example because of VLAN acceleration.
2205 void netif_nit_deliver(struct sk_buff *skb)
2207 struct packet_type *ptype;
2209 if (list_empty(&ptype_all))
2212 skb_reset_network_header(skb);
2213 skb_reset_transport_header(skb);
2214 skb->mac_len = skb->network_header - skb->mac_header;
2217 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2218 if (!ptype->dev || ptype->dev == skb->dev)
2219 deliver_skb(skb, ptype, skb->dev);
2225 * netif_receive_skb - process receive buffer from network
2226 * @skb: buffer to process
2228 * netif_receive_skb() is the main receive data processing function.
2229 * It always succeeds. The buffer may be dropped during processing
2230 * for congestion control or by the protocol layers.
2232 * This function may only be called from softirq context and interrupts
2233 * should be enabled.
2235 * Return values (usually ignored):
2236 * NET_RX_SUCCESS: no congestion
2237 * NET_RX_DROP: packet was dropped
2239 int netif_receive_skb(struct sk_buff *skb)
2241 struct packet_type *ptype, *pt_prev;
2242 struct net_device *orig_dev;
2243 struct net_device *null_or_orig;
2244 int ret = NET_RX_DROP;
2247 if (skb->vlan_tci && vlan_hwaccel_do_receive(skb))
2248 return NET_RX_SUCCESS;
2250 /* if we've gotten here through NAPI, check netpoll */
2251 if (netpoll_receive_skb(skb))
2254 if (!skb->tstamp.tv64)
2258 skb->iif = skb->dev->ifindex;
2260 null_or_orig = NULL;
2261 orig_dev = skb->dev;
2262 if (orig_dev->master) {
2263 if (skb_bond_should_drop(skb))
2264 null_or_orig = orig_dev; /* deliver only exact match */
2266 skb->dev = orig_dev->master;
2269 __get_cpu_var(netdev_rx_stat).total++;
2271 skb_reset_network_header(skb);
2272 skb_reset_transport_header(skb);
2273 skb->mac_len = skb->network_header - skb->mac_header;
2279 #ifdef CONFIG_NET_CLS_ACT
2280 if (skb->tc_verd & TC_NCLS) {
2281 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2286 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2287 if (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2288 ptype->dev == orig_dev) {
2290 ret = deliver_skb(skb, pt_prev, orig_dev);
2295 #ifdef CONFIG_NET_CLS_ACT
2296 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2302 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2305 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2311 type = skb->protocol;
2312 list_for_each_entry_rcu(ptype,
2313 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2314 if (ptype->type == type &&
2315 (ptype->dev == null_or_orig || ptype->dev == skb->dev ||
2316 ptype->dev == orig_dev)) {
2318 ret = deliver_skb(skb, pt_prev, orig_dev);
2324 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2327 /* Jamal, now you will not able to escape explaining
2328 * me how you were going to use this. :-)
2338 /* Network device is going away, flush any packets still pending */
2339 static void flush_backlog(void *arg)
2341 struct net_device *dev = arg;
2342 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2343 struct sk_buff *skb, *tmp;
2345 skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp)
2346 if (skb->dev == dev) {
2347 __skb_unlink(skb, &queue->input_pkt_queue);
2352 static int napi_gro_complete(struct sk_buff *skb)
2354 struct packet_type *ptype;
2355 __be16 type = skb->protocol;
2356 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2359 if (NAPI_GRO_CB(skb)->count == 1) {
2360 skb_shinfo(skb)->gso_size = 0;
2365 list_for_each_entry_rcu(ptype, head, list) {
2366 if (ptype->type != type || ptype->dev || !ptype->gro_complete)
2369 err = ptype->gro_complete(skb);
2375 WARN_ON(&ptype->list == head);
2377 return NET_RX_SUCCESS;
2381 return netif_receive_skb(skb);
2384 void napi_gro_flush(struct napi_struct *napi)
2386 struct sk_buff *skb, *next;
2388 for (skb = napi->gro_list; skb; skb = next) {
2391 napi_gro_complete(skb);
2394 napi->gro_count = 0;
2395 napi->gro_list = NULL;
2397 EXPORT_SYMBOL(napi_gro_flush);
2399 int dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2401 struct sk_buff **pp = NULL;
2402 struct packet_type *ptype;
2403 __be16 type = skb->protocol;
2404 struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK];
2409 if (!(skb->dev->features & NETIF_F_GRO))
2412 if (skb_is_gso(skb) || skb_has_frags(skb))
2416 list_for_each_entry_rcu(ptype, head, list) {
2417 if (ptype->type != type || ptype->dev || !ptype->gro_receive)
2420 skb_set_network_header(skb, skb_gro_offset(skb));
2421 mac_len = skb->network_header - skb->mac_header;
2422 skb->mac_len = mac_len;
2423 NAPI_GRO_CB(skb)->same_flow = 0;
2424 NAPI_GRO_CB(skb)->flush = 0;
2425 NAPI_GRO_CB(skb)->free = 0;
2427 pp = ptype->gro_receive(&napi->gro_list, skb);
2432 if (&ptype->list == head)
2435 same_flow = NAPI_GRO_CB(skb)->same_flow;
2436 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
2439 struct sk_buff *nskb = *pp;
2443 napi_gro_complete(nskb);
2450 if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS)
2454 NAPI_GRO_CB(skb)->count = 1;
2455 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
2456 skb->next = napi->gro_list;
2457 napi->gro_list = skb;
2461 if (skb_headlen(skb) < skb_gro_offset(skb)) {
2462 int grow = skb_gro_offset(skb) - skb_headlen(skb);
2464 BUG_ON(skb->end - skb->tail < grow);
2466 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
2469 skb->data_len -= grow;
2471 skb_shinfo(skb)->frags[0].page_offset += grow;
2472 skb_shinfo(skb)->frags[0].size -= grow;
2474 if (unlikely(!skb_shinfo(skb)->frags[0].size)) {
2475 put_page(skb_shinfo(skb)->frags[0].page);
2476 memmove(skb_shinfo(skb)->frags,
2477 skb_shinfo(skb)->frags + 1,
2478 --skb_shinfo(skb)->nr_frags);
2489 EXPORT_SYMBOL(dev_gro_receive);
2491 static int __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2495 if (netpoll_rx_on(skb))
2498 for (p = napi->gro_list; p; p = p->next) {
2499 NAPI_GRO_CB(p)->same_flow = (p->dev == skb->dev)
2500 && !compare_ether_header(skb_mac_header(p),
2501 skb_gro_mac_header(skb));
2502 NAPI_GRO_CB(p)->flush = 0;
2505 return dev_gro_receive(napi, skb);
2508 int napi_skb_finish(int ret, struct sk_buff *skb)
2510 int err = NET_RX_SUCCESS;
2514 return netif_receive_skb(skb);
2520 case GRO_MERGED_FREE:
2527 EXPORT_SYMBOL(napi_skb_finish);
2529 void skb_gro_reset_offset(struct sk_buff *skb)
2531 NAPI_GRO_CB(skb)->data_offset = 0;
2532 NAPI_GRO_CB(skb)->frag0 = NULL;
2533 NAPI_GRO_CB(skb)->frag0_len = 0;
2535 if (skb->mac_header == skb->tail &&
2536 !PageHighMem(skb_shinfo(skb)->frags[0].page)) {
2537 NAPI_GRO_CB(skb)->frag0 =
2538 page_address(skb_shinfo(skb)->frags[0].page) +
2539 skb_shinfo(skb)->frags[0].page_offset;
2540 NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size;
2543 EXPORT_SYMBOL(skb_gro_reset_offset);
2545 int napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
2547 skb_gro_reset_offset(skb);
2549 return napi_skb_finish(__napi_gro_receive(napi, skb), skb);
2551 EXPORT_SYMBOL(napi_gro_receive);
2553 void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
2555 __skb_pull(skb, skb_headlen(skb));
2556 skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb));
2560 EXPORT_SYMBOL(napi_reuse_skb);
2562 struct sk_buff *napi_get_frags(struct napi_struct *napi)
2564 struct net_device *dev = napi->dev;
2565 struct sk_buff *skb = napi->skb;
2568 skb = netdev_alloc_skb(dev, GRO_MAX_HEAD + NET_IP_ALIGN);
2572 skb_reserve(skb, NET_IP_ALIGN);
2580 EXPORT_SYMBOL(napi_get_frags);
2582 int napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, int ret)
2584 int err = NET_RX_SUCCESS;
2589 skb->protocol = eth_type_trans(skb, napi->dev);
2591 if (ret == GRO_NORMAL)
2592 return netif_receive_skb(skb);
2594 skb_gro_pull(skb, -ETH_HLEN);
2601 case GRO_MERGED_FREE:
2602 napi_reuse_skb(napi, skb);
2608 EXPORT_SYMBOL(napi_frags_finish);
2610 struct sk_buff *napi_frags_skb(struct napi_struct *napi)
2612 struct sk_buff *skb = napi->skb;
2619 skb_reset_mac_header(skb);
2620 skb_gro_reset_offset(skb);
2622 off = skb_gro_offset(skb);
2623 hlen = off + sizeof(*eth);
2624 eth = skb_gro_header_fast(skb, off);
2625 if (skb_gro_header_hard(skb, hlen)) {
2626 eth = skb_gro_header_slow(skb, hlen, off);
2627 if (unlikely(!eth)) {
2628 napi_reuse_skb(napi, skb);
2634 skb_gro_pull(skb, sizeof(*eth));
2637 * This works because the only protocols we care about don't require
2638 * special handling. We'll fix it up properly at the end.
2640 skb->protocol = eth->h_proto;
2645 EXPORT_SYMBOL(napi_frags_skb);
2647 int napi_gro_frags(struct napi_struct *napi)
2649 struct sk_buff *skb = napi_frags_skb(napi);
2654 return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb));
2656 EXPORT_SYMBOL(napi_gro_frags);
2658 static int process_backlog(struct napi_struct *napi, int quota)
2661 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2662 unsigned long start_time = jiffies;
2664 napi->weight = weight_p;
2666 struct sk_buff *skb;
2668 local_irq_disable();
2669 skb = __skb_dequeue(&queue->input_pkt_queue);
2671 __napi_complete(napi);
2677 netif_receive_skb(skb);
2678 } while (++work < quota && jiffies == start_time);
2684 * __napi_schedule - schedule for receive
2685 * @n: entry to schedule
2687 * The entry's receive function will be scheduled to run
2689 void __napi_schedule(struct napi_struct *n)
2691 unsigned long flags;
2693 local_irq_save(flags);
2694 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
2695 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2696 local_irq_restore(flags);
2698 EXPORT_SYMBOL(__napi_schedule);
2700 void __napi_complete(struct napi_struct *n)
2702 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
2703 BUG_ON(n->gro_list);
2705 list_del(&n->poll_list);
2706 smp_mb__before_clear_bit();
2707 clear_bit(NAPI_STATE_SCHED, &n->state);
2709 EXPORT_SYMBOL(__napi_complete);
2711 void napi_complete(struct napi_struct *n)
2713 unsigned long flags;
2716 * don't let napi dequeue from the cpu poll list
2717 * just in case its running on a different cpu
2719 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
2723 local_irq_save(flags);
2725 local_irq_restore(flags);
2727 EXPORT_SYMBOL(napi_complete);
2729 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
2730 int (*poll)(struct napi_struct *, int), int weight)
2732 INIT_LIST_HEAD(&napi->poll_list);
2733 napi->gro_count = 0;
2734 napi->gro_list = NULL;
2737 napi->weight = weight;
2738 list_add(&napi->dev_list, &dev->napi_list);
2740 #ifdef CONFIG_NETPOLL
2741 spin_lock_init(&napi->poll_lock);
2742 napi->poll_owner = -1;
2744 set_bit(NAPI_STATE_SCHED, &napi->state);
2746 EXPORT_SYMBOL(netif_napi_add);
2748 void netif_napi_del(struct napi_struct *napi)
2750 struct sk_buff *skb, *next;
2752 list_del_init(&napi->dev_list);
2753 napi_free_frags(napi);
2755 for (skb = napi->gro_list; skb; skb = next) {
2761 napi->gro_list = NULL;
2762 napi->gro_count = 0;
2764 EXPORT_SYMBOL(netif_napi_del);
2767 static void net_rx_action(struct softirq_action *h)
2769 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
2770 unsigned long time_limit = jiffies + 2;
2771 int budget = netdev_budget;
2774 local_irq_disable();
2776 while (!list_empty(list)) {
2777 struct napi_struct *n;
2780 /* If softirq window is exhuasted then punt.
2781 * Allow this to run for 2 jiffies since which will allow
2782 * an average latency of 1.5/HZ.
2784 if (unlikely(budget <= 0 || time_after(jiffies, time_limit)))
2789 /* Even though interrupts have been re-enabled, this
2790 * access is safe because interrupts can only add new
2791 * entries to the tail of this list, and only ->poll()
2792 * calls can remove this head entry from the list.
2794 n = list_entry(list->next, struct napi_struct, poll_list);
2796 have = netpoll_poll_lock(n);
2800 /* This NAPI_STATE_SCHED test is for avoiding a race
2801 * with netpoll's poll_napi(). Only the entity which
2802 * obtains the lock and sees NAPI_STATE_SCHED set will
2803 * actually make the ->poll() call. Therefore we avoid
2804 * accidently calling ->poll() when NAPI is not scheduled.
2807 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
2808 work = n->poll(n, weight);
2812 WARN_ON_ONCE(work > weight);
2816 local_irq_disable();
2818 /* Drivers must not modify the NAPI state if they
2819 * consume the entire weight. In such cases this code
2820 * still "owns" the NAPI instance and therefore can
2821 * move the instance around on the list at-will.
2823 if (unlikely(work == weight)) {
2824 if (unlikely(napi_disable_pending(n)))
2827 list_move_tail(&n->poll_list, list);
2830 netpoll_poll_unlock(have);
2835 #ifdef CONFIG_NET_DMA
2837 * There may not be any more sk_buffs coming right now, so push
2838 * any pending DMA copies to hardware
2840 dma_issue_pending_all();
2846 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2847 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2851 static gifconf_func_t * gifconf_list [NPROTO];
2854 * register_gifconf - register a SIOCGIF handler
2855 * @family: Address family
2856 * @gifconf: Function handler
2858 * Register protocol dependent address dumping routines. The handler
2859 * that is passed must not be freed or reused until it has been replaced
2860 * by another handler.
2862 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
2864 if (family >= NPROTO)
2866 gifconf_list[family] = gifconf;
2872 * Map an interface index to its name (SIOCGIFNAME)
2876 * We need this ioctl for efficient implementation of the
2877 * if_indextoname() function required by the IPv6 API. Without
2878 * it, we would have to search all the interfaces to find a
2882 static int dev_ifname(struct net *net, struct ifreq __user *arg)
2884 struct net_device *dev;
2888 * Fetch the caller's info block.
2891 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2894 read_lock(&dev_base_lock);
2895 dev = __dev_get_by_index(net, ifr.ifr_ifindex);
2897 read_unlock(&dev_base_lock);
2901 strcpy(ifr.ifr_name, dev->name);
2902 read_unlock(&dev_base_lock);
2904 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2910 * Perform a SIOCGIFCONF call. This structure will change
2911 * size eventually, and there is nothing I can do about it.
2912 * Thus we will need a 'compatibility mode'.
2915 static int dev_ifconf(struct net *net, char __user *arg)
2918 struct net_device *dev;
2925 * Fetch the caller's info block.
2928 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2935 * Loop over the interfaces, and write an info block for each.
2939 for_each_netdev(net, dev) {
2940 for (i = 0; i < NPROTO; i++) {
2941 if (gifconf_list[i]) {
2944 done = gifconf_list[i](dev, NULL, 0);
2946 done = gifconf_list[i](dev, pos + total,
2956 * All done. Write the updated control block back to the caller.
2958 ifc.ifc_len = total;
2961 * Both BSD and Solaris return 0 here, so we do too.
2963 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2966 #ifdef CONFIG_PROC_FS
2968 * This is invoked by the /proc filesystem handler to display a device
2971 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2972 __acquires(dev_base_lock)
2974 struct net *net = seq_file_net(seq);
2976 struct net_device *dev;
2978 read_lock(&dev_base_lock);
2980 return SEQ_START_TOKEN;
2983 for_each_netdev(net, dev)
2990 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2992 struct net *net = seq_file_net(seq);
2994 return v == SEQ_START_TOKEN ?
2995 first_net_device(net) : next_net_device((struct net_device *)v);
2998 void dev_seq_stop(struct seq_file *seq, void *v)
2999 __releases(dev_base_lock)
3001 read_unlock(&dev_base_lock);
3004 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
3006 const struct net_device_stats *stats = dev_get_stats(dev);
3008 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
3009 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
3010 dev->name, stats->rx_bytes, stats->rx_packets,
3012 stats->rx_dropped + stats->rx_missed_errors,
3013 stats->rx_fifo_errors,
3014 stats->rx_length_errors + stats->rx_over_errors +
3015 stats->rx_crc_errors + stats->rx_frame_errors,
3016 stats->rx_compressed, stats->multicast,
3017 stats->tx_bytes, stats->tx_packets,
3018 stats->tx_errors, stats->tx_dropped,
3019 stats->tx_fifo_errors, stats->collisions,
3020 stats->tx_carrier_errors +
3021 stats->tx_aborted_errors +
3022 stats->tx_window_errors +
3023 stats->tx_heartbeat_errors,
3024 stats->tx_compressed);
3028 * Called from the PROCfs module. This now uses the new arbitrary sized
3029 * /proc/net interface to create /proc/net/dev
3031 static int dev_seq_show(struct seq_file *seq, void *v)
3033 if (v == SEQ_START_TOKEN)
3034 seq_puts(seq, "Inter-| Receive "
3036 " face |bytes packets errs drop fifo frame "
3037 "compressed multicast|bytes packets errs "
3038 "drop fifo colls carrier compressed\n");
3040 dev_seq_printf_stats(seq, v);
3044 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
3046 struct netif_rx_stats *rc = NULL;
3048 while (*pos < nr_cpu_ids)
3049 if (cpu_online(*pos)) {
3050 rc = &per_cpu(netdev_rx_stat, *pos);
3057 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
3059 return softnet_get_online(pos);
3062 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3065 return softnet_get_online(pos);
3068 static void softnet_seq_stop(struct seq_file *seq, void *v)
3072 static int softnet_seq_show(struct seq_file *seq, void *v)
3074 struct netif_rx_stats *s = v;
3076 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
3077 s->total, s->dropped, s->time_squeeze, 0,
3078 0, 0, 0, 0, /* was fastroute */
3083 static const struct seq_operations dev_seq_ops = {
3084 .start = dev_seq_start,
3085 .next = dev_seq_next,
3086 .stop = dev_seq_stop,
3087 .show = dev_seq_show,
3090 static int dev_seq_open(struct inode *inode, struct file *file)
3092 return seq_open_net(inode, file, &dev_seq_ops,
3093 sizeof(struct seq_net_private));
3096 static const struct file_operations dev_seq_fops = {
3097 .owner = THIS_MODULE,
3098 .open = dev_seq_open,
3100 .llseek = seq_lseek,
3101 .release = seq_release_net,
3104 static const struct seq_operations softnet_seq_ops = {
3105 .start = softnet_seq_start,
3106 .next = softnet_seq_next,
3107 .stop = softnet_seq_stop,
3108 .show = softnet_seq_show,
3111 static int softnet_seq_open(struct inode *inode, struct file *file)
3113 return seq_open(file, &softnet_seq_ops);
3116 static const struct file_operations softnet_seq_fops = {
3117 .owner = THIS_MODULE,
3118 .open = softnet_seq_open,
3120 .llseek = seq_lseek,
3121 .release = seq_release,
3124 static void *ptype_get_idx(loff_t pos)
3126 struct packet_type *pt = NULL;
3130 list_for_each_entry_rcu(pt, &ptype_all, list) {
3136 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
3137 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
3146 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
3150 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
3153 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3155 struct packet_type *pt;
3156 struct list_head *nxt;
3160 if (v == SEQ_START_TOKEN)
3161 return ptype_get_idx(0);
3164 nxt = pt->list.next;
3165 if (pt->type == htons(ETH_P_ALL)) {
3166 if (nxt != &ptype_all)
3169 nxt = ptype_base[0].next;
3171 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
3173 while (nxt == &ptype_base[hash]) {
3174 if (++hash >= PTYPE_HASH_SIZE)
3176 nxt = ptype_base[hash].next;
3179 return list_entry(nxt, struct packet_type, list);
3182 static void ptype_seq_stop(struct seq_file *seq, void *v)
3188 static int ptype_seq_show(struct seq_file *seq, void *v)
3190 struct packet_type *pt = v;
3192 if (v == SEQ_START_TOKEN)
3193 seq_puts(seq, "Type Device Function\n");
3194 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
3195 if (pt->type == htons(ETH_P_ALL))
3196 seq_puts(seq, "ALL ");
3198 seq_printf(seq, "%04x", ntohs(pt->type));
3200 seq_printf(seq, " %-8s %pF\n",
3201 pt->dev ? pt->dev->name : "", pt->func);
3207 static const struct seq_operations ptype_seq_ops = {
3208 .start = ptype_seq_start,
3209 .next = ptype_seq_next,
3210 .stop = ptype_seq_stop,
3211 .show = ptype_seq_show,
3214 static int ptype_seq_open(struct inode *inode, struct file *file)
3216 return seq_open_net(inode, file, &ptype_seq_ops,
3217 sizeof(struct seq_net_private));
3220 static const struct file_operations ptype_seq_fops = {
3221 .owner = THIS_MODULE,
3222 .open = ptype_seq_open,
3224 .llseek = seq_lseek,
3225 .release = seq_release_net,
3229 static int __net_init dev_proc_net_init(struct net *net)
3233 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
3235 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
3237 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
3240 if (wext_proc_init(net))
3246 proc_net_remove(net, "ptype");
3248 proc_net_remove(net, "softnet_stat");
3250 proc_net_remove(net, "dev");
3254 static void __net_exit dev_proc_net_exit(struct net *net)
3256 wext_proc_exit(net);
3258 proc_net_remove(net, "ptype");
3259 proc_net_remove(net, "softnet_stat");
3260 proc_net_remove(net, "dev");
3263 static struct pernet_operations __net_initdata dev_proc_ops = {
3264 .init = dev_proc_net_init,
3265 .exit = dev_proc_net_exit,
3268 static int __init dev_proc_init(void)
3270 return register_pernet_subsys(&dev_proc_ops);
3273 #define dev_proc_init() 0
3274 #endif /* CONFIG_PROC_FS */
3278 * netdev_set_master - set up master/slave pair
3279 * @slave: slave device
3280 * @master: new master device
3282 * Changes the master device of the slave. Pass %NULL to break the
3283 * bonding. The caller must hold the RTNL semaphore. On a failure
3284 * a negative errno code is returned. On success the reference counts
3285 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
3286 * function returns zero.
3288 int netdev_set_master(struct net_device *slave, struct net_device *master)
3290 struct net_device *old = slave->master;
3300 slave->master = master;
3308 slave->flags |= IFF_SLAVE;
3310 slave->flags &= ~IFF_SLAVE;
3312 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
3316 static void dev_change_rx_flags(struct net_device *dev, int flags)
3318 const struct net_device_ops *ops = dev->netdev_ops;
3320 if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
3321 ops->ndo_change_rx_flags(dev, flags);
3324 static int __dev_set_promiscuity(struct net_device *dev, int inc)
3326 unsigned short old_flags = dev->flags;
3332 dev->flags |= IFF_PROMISC;
3333 dev->promiscuity += inc;
3334 if (dev->promiscuity == 0) {
3337 * If inc causes overflow, untouch promisc and return error.
3340 dev->flags &= ~IFF_PROMISC;
3342 dev->promiscuity -= inc;
3343 printk(KERN_WARNING "%s: promiscuity touches roof, "
3344 "set promiscuity failed, promiscuity feature "
3345 "of device might be broken.\n", dev->name);
3349 if (dev->flags != old_flags) {
3350 printk(KERN_INFO "device %s %s promiscuous mode\n",
3351 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
3353 if (audit_enabled) {
3354 current_uid_gid(&uid, &gid);
3355 audit_log(current->audit_context, GFP_ATOMIC,
3356 AUDIT_ANOM_PROMISCUOUS,
3357 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
3358 dev->name, (dev->flags & IFF_PROMISC),
3359 (old_flags & IFF_PROMISC),
3360 audit_get_loginuid(current),
3362 audit_get_sessionid(current));
3365 dev_change_rx_flags(dev, IFF_PROMISC);
3371 * dev_set_promiscuity - update promiscuity count on a device
3375 * Add or remove promiscuity from a device. While the count in the device
3376 * remains above zero the interface remains promiscuous. Once it hits zero
3377 * the device reverts back to normal filtering operation. A negative inc
3378 * value is used to drop promiscuity on the device.
3379 * Return 0 if successful or a negative errno code on error.
3381 int dev_set_promiscuity(struct net_device *dev, int inc)
3383 unsigned short old_flags = dev->flags;
3386 err = __dev_set_promiscuity(dev, inc);
3389 if (dev->flags != old_flags)
3390 dev_set_rx_mode(dev);
3395 * dev_set_allmulti - update allmulti count on a device
3399 * Add or remove reception of all multicast frames to a device. While the
3400 * count in the device remains above zero the interface remains listening
3401 * to all interfaces. Once it hits zero the device reverts back to normal
3402 * filtering operation. A negative @inc value is used to drop the counter
3403 * when releasing a resource needing all multicasts.
3404 * Return 0 if successful or a negative errno code on error.
3407 int dev_set_allmulti(struct net_device *dev, int inc)
3409 unsigned short old_flags = dev->flags;
3413 dev->flags |= IFF_ALLMULTI;
3414 dev->allmulti += inc;
3415 if (dev->allmulti == 0) {
3418 * If inc causes overflow, untouch allmulti and return error.
3421 dev->flags &= ~IFF_ALLMULTI;
3423 dev->allmulti -= inc;
3424 printk(KERN_WARNING "%s: allmulti touches roof, "
3425 "set allmulti failed, allmulti feature of "
3426 "device might be broken.\n", dev->name);
3430 if (dev->flags ^ old_flags) {
3431 dev_change_rx_flags(dev, IFF_ALLMULTI);
3432 dev_set_rx_mode(dev);
3438 * Upload unicast and multicast address lists to device and
3439 * configure RX filtering. When the device doesn't support unicast
3440 * filtering it is put in promiscuous mode while unicast addresses
3443 void __dev_set_rx_mode(struct net_device *dev)
3445 const struct net_device_ops *ops = dev->netdev_ops;
3447 /* dev_open will call this function so the list will stay sane. */
3448 if (!(dev->flags&IFF_UP))
3451 if (!netif_device_present(dev))
3454 if (ops->ndo_set_rx_mode)
3455 ops->ndo_set_rx_mode(dev);
3457 /* Unicast addresses changes may only happen under the rtnl,
3458 * therefore calling __dev_set_promiscuity here is safe.
3460 if (dev->uc_count > 0 && !dev->uc_promisc) {
3461 __dev_set_promiscuity(dev, 1);
3462 dev->uc_promisc = 1;
3463 } else if (dev->uc_count == 0 && dev->uc_promisc) {
3464 __dev_set_promiscuity(dev, -1);
3465 dev->uc_promisc = 0;
3468 if (ops->ndo_set_multicast_list)
3469 ops->ndo_set_multicast_list(dev);
3473 void dev_set_rx_mode(struct net_device *dev)
3475 netif_addr_lock_bh(dev);
3476 __dev_set_rx_mode(dev);
3477 netif_addr_unlock_bh(dev);
3480 /* hw addresses list handling functions */
3482 static int __hw_addr_add(struct list_head *list, int *delta,
3483 unsigned char *addr, int addr_len,
3484 unsigned char addr_type)
3486 struct netdev_hw_addr *ha;
3489 if (addr_len > MAX_ADDR_LEN)
3492 list_for_each_entry(ha, list, list) {
3493 if (!memcmp(ha->addr, addr, addr_len) &&
3494 ha->type == addr_type) {
3501 alloc_size = sizeof(*ha);
3502 if (alloc_size < L1_CACHE_BYTES)
3503 alloc_size = L1_CACHE_BYTES;
3504 ha = kmalloc(alloc_size, GFP_ATOMIC);
3507 memcpy(ha->addr, addr, addr_len);
3508 ha->type = addr_type;
3511 list_add_tail_rcu(&ha->list, list);
3517 static void ha_rcu_free(struct rcu_head *head)
3519 struct netdev_hw_addr *ha;
3521 ha = container_of(head, struct netdev_hw_addr, rcu_head);
3525 static int __hw_addr_del(struct list_head *list, int *delta,
3526 unsigned char *addr, int addr_len,
3527 unsigned char addr_type)
3529 struct netdev_hw_addr *ha;
3531 list_for_each_entry(ha, list, list) {
3532 if (!memcmp(ha->addr, addr, addr_len) &&
3533 (ha->type == addr_type || !addr_type)) {
3536 list_del_rcu(&ha->list);
3537 call_rcu(&ha->rcu_head, ha_rcu_free);
3546 static int __hw_addr_add_multiple(struct list_head *to_list, int *to_delta,
3547 struct list_head *from_list, int addr_len,
3548 unsigned char addr_type)
3551 struct netdev_hw_addr *ha, *ha2;
3554 list_for_each_entry(ha, from_list, list) {
3555 type = addr_type ? addr_type : ha->type;
3556 err = __hw_addr_add(to_list, to_delta, ha->addr,
3564 list_for_each_entry(ha2, from_list, list) {
3567 type = addr_type ? addr_type : ha2->type;
3568 __hw_addr_del(to_list, to_delta, ha2->addr,
3574 static void __hw_addr_del_multiple(struct list_head *to_list, int *to_delta,
3575 struct list_head *from_list, int addr_len,
3576 unsigned char addr_type)
3578 struct netdev_hw_addr *ha;
3581 list_for_each_entry(ha, from_list, list) {
3582 type = addr_type ? addr_type : ha->type;
3583 __hw_addr_del(to_list, to_delta, ha->addr,
3584 addr_len, addr_type);
3588 static int __hw_addr_sync(struct list_head *to_list, int *to_delta,
3589 struct list_head *from_list, int *from_delta,
3593 struct netdev_hw_addr *ha, *tmp;
3595 list_for_each_entry_safe(ha, tmp, from_list, list) {
3597 err = __hw_addr_add(to_list, to_delta, ha->addr,
3598 addr_len, ha->type);
3603 } else if (ha->refcount == 1) {
3604 __hw_addr_del(to_list, to_delta, ha->addr,
3605 addr_len, ha->type);
3606 __hw_addr_del(from_list, from_delta, ha->addr,
3607 addr_len, ha->type);
3613 static void __hw_addr_unsync(struct list_head *to_list, int *to_delta,
3614 struct list_head *from_list, int *from_delta,
3617 struct netdev_hw_addr *ha, *tmp;
3619 list_for_each_entry_safe(ha, tmp, from_list, list) {
3621 __hw_addr_del(to_list, to_delta, ha->addr,
3622 addr_len, ha->type);
3624 __hw_addr_del(from_list, from_delta, ha->addr,
3625 addr_len, ha->type);
3631 static void __hw_addr_flush(struct list_head *list)
3633 struct netdev_hw_addr *ha, *tmp;
3635 list_for_each_entry_safe(ha, tmp, list, list) {
3636 list_del_rcu(&ha->list);
3637 call_rcu(&ha->rcu_head, ha_rcu_free);
3641 /* Device addresses handling functions */
3643 static void dev_addr_flush(struct net_device *dev)
3645 /* rtnl_mutex must be held here */
3647 __hw_addr_flush(&dev->dev_addr_list);
3648 dev->dev_addr = NULL;
3651 static int dev_addr_init(struct net_device *dev)
3653 unsigned char addr[MAX_ADDR_LEN];
3654 struct netdev_hw_addr *ha;
3657 /* rtnl_mutex must be held here */
3659 INIT_LIST_HEAD(&dev->dev_addr_list);
3660 memset(addr, 0, sizeof(addr));
3661 err = __hw_addr_add(&dev->dev_addr_list, NULL, addr, sizeof(addr),
3662 NETDEV_HW_ADDR_T_LAN);
3665 * Get the first (previously created) address from the list
3666 * and set dev_addr pointer to this location.
3668 ha = list_first_entry(&dev->dev_addr_list,
3669 struct netdev_hw_addr, list);
3670 dev->dev_addr = ha->addr;
3676 * dev_addr_add - Add a device address
3678 * @addr: address to add
3679 * @addr_type: address type
3681 * Add a device address to the device or increase the reference count if
3682 * it already exists.
3684 * The caller must hold the rtnl_mutex.
3686 int dev_addr_add(struct net_device *dev, unsigned char *addr,
3687 unsigned char addr_type)
3693 err = __hw_addr_add(&dev->dev_addr_list, NULL, addr, dev->addr_len,
3696 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3699 EXPORT_SYMBOL(dev_addr_add);
3702 * dev_addr_del - Release a device address.
3704 * @addr: address to delete
3705 * @addr_type: address type
3707 * Release reference to a device address and remove it from the device
3708 * if the reference count drops to zero.
3710 * The caller must hold the rtnl_mutex.
3712 int dev_addr_del(struct net_device *dev, unsigned char *addr,
3713 unsigned char addr_type)
3716 struct netdev_hw_addr *ha;
3721 * We can not remove the first address from the list because
3722 * dev->dev_addr points to that.
3724 ha = list_first_entry(&dev->dev_addr_list, struct netdev_hw_addr, list);
3725 if (ha->addr == dev->dev_addr && ha->refcount == 1)
3728 err = __hw_addr_del(&dev->dev_addr_list, NULL, addr, dev->addr_len,
3731 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3734 EXPORT_SYMBOL(dev_addr_del);
3737 * dev_addr_add_multiple - Add device addresses from another device
3738 * @to_dev: device to which addresses will be added
3739 * @from_dev: device from which addresses will be added
3740 * @addr_type: address type - 0 means type will be used from from_dev
3742 * Add device addresses of the one device to another.
3744 * The caller must hold the rtnl_mutex.
3746 int dev_addr_add_multiple(struct net_device *to_dev,
3747 struct net_device *from_dev,
3748 unsigned char addr_type)
3754 if (from_dev->addr_len != to_dev->addr_len)
3756 err = __hw_addr_add_multiple(&to_dev->dev_addr_list, NULL,
3757 &from_dev->dev_addr_list,
3758 to_dev->addr_len, addr_type);
3760 call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
3763 EXPORT_SYMBOL(dev_addr_add_multiple);
3766 * dev_addr_del_multiple - Delete device addresses by another device
3767 * @to_dev: device where the addresses will be deleted
3768 * @from_dev: device by which addresses the addresses will be deleted
3769 * @addr_type: address type - 0 means type will used from from_dev
3771 * Deletes addresses in to device by the list of addresses in from device.
3773 * The caller must hold the rtnl_mutex.
3775 int dev_addr_del_multiple(struct net_device *to_dev,
3776 struct net_device *from_dev,
3777 unsigned char addr_type)
3781 if (from_dev->addr_len != to_dev->addr_len)
3783 __hw_addr_del_multiple(&to_dev->dev_addr_list, NULL,
3784 &from_dev->dev_addr_list,
3785 to_dev->addr_len, addr_type);
3786 call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev);
3789 EXPORT_SYMBOL(dev_addr_del_multiple);
3791 /* unicast and multicast addresses handling functions */
3793 int __dev_addr_delete(struct dev_addr_list **list, int *count,
3794 void *addr, int alen, int glbl)
3796 struct dev_addr_list *da;
3798 for (; (da = *list) != NULL; list = &da->next) {
3799 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3800 alen == da->da_addrlen) {
3802 int old_glbl = da->da_gusers;
3819 int __dev_addr_add(struct dev_addr_list **list, int *count,
3820 void *addr, int alen, int glbl)
3822 struct dev_addr_list *da;
3824 for (da = *list; da != NULL; da = da->next) {
3825 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
3826 da->da_addrlen == alen) {
3828 int old_glbl = da->da_gusers;
3838 da = kzalloc(sizeof(*da), GFP_ATOMIC);
3841 memcpy(da->da_addr, addr, alen);
3842 da->da_addrlen = alen;
3844 da->da_gusers = glbl ? 1 : 0;
3852 * dev_unicast_delete - Release secondary unicast address.
3854 * @addr: address to delete
3856 * Release reference to a secondary unicast address and remove it
3857 * from the device if the reference count drops to zero.
3859 * The caller must hold the rtnl_mutex.
3861 int dev_unicast_delete(struct net_device *dev, void *addr)
3867 err = __hw_addr_del(&dev->uc_list, &dev->uc_count, addr,
3868 dev->addr_len, NETDEV_HW_ADDR_T_UNICAST);
3870 __dev_set_rx_mode(dev);
3873 EXPORT_SYMBOL(dev_unicast_delete);
3876 * dev_unicast_add - add a secondary unicast address
3878 * @addr: address to add
3880 * Add a secondary unicast address to the device or increase
3881 * the reference count if it already exists.
3883 * The caller must hold the rtnl_mutex.
3885 int dev_unicast_add(struct net_device *dev, void *addr)
3891 err = __hw_addr_add(&dev->uc_list, &dev->uc_count, addr,
3892 dev->addr_len, NETDEV_HW_ADDR_T_UNICAST);
3894 __dev_set_rx_mode(dev);
3897 EXPORT_SYMBOL(dev_unicast_add);
3899 int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
3900 struct dev_addr_list **from, int *from_count)
3902 struct dev_addr_list *da, *next;
3906 while (da != NULL) {
3908 if (!da->da_synced) {
3909 err = __dev_addr_add(to, to_count,
3910 da->da_addr, da->da_addrlen, 0);
3915 } else if (da->da_users == 1) {
3916 __dev_addr_delete(to, to_count,
3917 da->da_addr, da->da_addrlen, 0);
3918 __dev_addr_delete(from, from_count,
3919 da->da_addr, da->da_addrlen, 0);
3926 void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
3927 struct dev_addr_list **from, int *from_count)
3929 struct dev_addr_list *da, *next;
3932 while (da != NULL) {
3934 if (da->da_synced) {
3935 __dev_addr_delete(to, to_count,
3936 da->da_addr, da->da_addrlen, 0);
3938 __dev_addr_delete(from, from_count,
3939 da->da_addr, da->da_addrlen, 0);
3946 * dev_unicast_sync - Synchronize device's unicast list to another device
3947 * @to: destination device
3948 * @from: source device
3950 * Add newly added addresses to the destination device and release
3951 * addresses that have no users left.
3953 * This function is intended to be called from the dev->set_rx_mode
3954 * function of layered software devices.
3956 int dev_unicast_sync(struct net_device *to, struct net_device *from)
3962 if (to->addr_len != from->addr_len)
3965 err = __hw_addr_sync(&to->uc_list, &to->uc_count,
3966 &from->uc_list, &from->uc_count, to->addr_len);
3968 __dev_set_rx_mode(to);
3971 EXPORT_SYMBOL(dev_unicast_sync);
3974 * dev_unicast_unsync - Remove synchronized addresses from the destination device
3975 * @to: destination device
3976 * @from: source device
3978 * Remove all addresses that were added to the destination device by
3979 * dev_unicast_sync(). This function is intended to be called from the
3980 * dev->stop function of layered software devices.
3982 void dev_unicast_unsync(struct net_device *to, struct net_device *from)
3986 if (to->addr_len != from->addr_len)
3989 __hw_addr_unsync(&to->uc_list, &to->uc_count,
3990 &from->uc_list, &from->uc_count, to->addr_len);
3991 __dev_set_rx_mode(to);
3993 EXPORT_SYMBOL(dev_unicast_unsync);
3995 static void dev_unicast_flush(struct net_device *dev)
3997 /* rtnl_mutex must be held here */
3999 __hw_addr_flush(&dev->uc_list);
4003 static void dev_unicast_init(struct net_device *dev)
4005 /* rtnl_mutex must be held here */
4007 INIT_LIST_HEAD(&dev->uc_list);
4011 static void __dev_addr_discard(struct dev_addr_list **list)
4013 struct dev_addr_list *tmp;
4015 while (*list != NULL) {
4018 if (tmp->da_users > tmp->da_gusers)
4019 printk("__dev_addr_discard: address leakage! "
4020 "da_users=%d\n", tmp->da_users);
4025 static void dev_addr_discard(struct net_device *dev)
4027 netif_addr_lock_bh(dev);
4029 __dev_addr_discard(&dev->mc_list);
4032 netif_addr_unlock_bh(dev);
4036 * dev_get_flags - get flags reported to userspace
4039 * Get the combination of flag bits exported through APIs to userspace.
4041 unsigned dev_get_flags(const struct net_device *dev)
4045 flags = (dev->flags & ~(IFF_PROMISC |
4050 (dev->gflags & (IFF_PROMISC |
4053 if (netif_running(dev)) {
4054 if (netif_oper_up(dev))
4055 flags |= IFF_RUNNING;
4056 if (netif_carrier_ok(dev))
4057 flags |= IFF_LOWER_UP;
4058 if (netif_dormant(dev))
4059 flags |= IFF_DORMANT;
4066 * dev_change_flags - change device settings
4068 * @flags: device state flags
4070 * Change settings on device based state flags. The flags are
4071 * in the userspace exported format.
4073 int dev_change_flags(struct net_device *dev, unsigned flags)
4076 int old_flags = dev->flags;
4081 * Set the flags on our device.
4084 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
4085 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
4087 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
4091 * Load in the correct multicast list now the flags have changed.
4094 if ((old_flags ^ flags) & IFF_MULTICAST)
4095 dev_change_rx_flags(dev, IFF_MULTICAST);
4097 dev_set_rx_mode(dev);
4100 * Have we downed the interface. We handle IFF_UP ourselves
4101 * according to user attempts to set it, rather than blindly
4106 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
4107 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
4110 dev_set_rx_mode(dev);
4113 if (dev->flags & IFF_UP &&
4114 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
4116 call_netdevice_notifiers(NETDEV_CHANGE, dev);
4118 if ((flags ^ dev->gflags) & IFF_PROMISC) {
4119 int inc = (flags & IFF_PROMISC) ? +1 : -1;
4120 dev->gflags ^= IFF_PROMISC;
4121 dev_set_promiscuity(dev, inc);
4124 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
4125 is important. Some (broken) drivers set IFF_PROMISC, when
4126 IFF_ALLMULTI is requested not asking us and not reporting.
4128 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
4129 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
4130 dev->gflags ^= IFF_ALLMULTI;
4131 dev_set_allmulti(dev, inc);
4134 /* Exclude state transition flags, already notified */
4135 changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
4137 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
4143 * dev_set_mtu - Change maximum transfer unit
4145 * @new_mtu: new transfer unit
4147 * Change the maximum transfer size of the network device.
4149 int dev_set_mtu(struct net_device *dev, int new_mtu)
4151 const struct net_device_ops *ops = dev->netdev_ops;
4154 if (new_mtu == dev->mtu)
4157 /* MTU must be positive. */
4161 if (!netif_device_present(dev))
4165 if (ops->ndo_change_mtu)
4166 err = ops->ndo_change_mtu(dev, new_mtu);
4170 if (!err && dev->flags & IFF_UP)
4171 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
4176 * dev_set_mac_address - Change Media Access Control Address
4180 * Change the hardware (MAC) address of the device
4182 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
4184 const struct net_device_ops *ops = dev->netdev_ops;
4187 if (!ops->ndo_set_mac_address)
4189 if (sa->sa_family != dev->type)
4191 if (!netif_device_present(dev))
4193 err = ops->ndo_set_mac_address(dev, sa);
4195 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4200 * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
4202 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
4205 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4211 case SIOCGIFFLAGS: /* Get interface flags */
4212 ifr->ifr_flags = dev_get_flags(dev);
4215 case SIOCGIFMETRIC: /* Get the metric on the interface
4216 (currently unused) */
4217 ifr->ifr_metric = 0;
4220 case SIOCGIFMTU: /* Get the MTU of a device */
4221 ifr->ifr_mtu = dev->mtu;
4226 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
4228 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
4229 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4230 ifr->ifr_hwaddr.sa_family = dev->type;
4238 ifr->ifr_map.mem_start = dev->mem_start;
4239 ifr->ifr_map.mem_end = dev->mem_end;
4240 ifr->ifr_map.base_addr = dev->base_addr;
4241 ifr->ifr_map.irq = dev->irq;
4242 ifr->ifr_map.dma = dev->dma;
4243 ifr->ifr_map.port = dev->if_port;
4247 ifr->ifr_ifindex = dev->ifindex;
4251 ifr->ifr_qlen = dev->tx_queue_len;
4255 /* dev_ioctl() should ensure this case
4267 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
4269 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
4272 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
4273 const struct net_device_ops *ops;
4278 ops = dev->netdev_ops;
4281 case SIOCSIFFLAGS: /* Set interface flags */
4282 return dev_change_flags(dev, ifr->ifr_flags);
4284 case SIOCSIFMETRIC: /* Set the metric on the interface
4285 (currently unused) */
4288 case SIOCSIFMTU: /* Set the MTU of a device */
4289 return dev_set_mtu(dev, ifr->ifr_mtu);
4292 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
4294 case SIOCSIFHWBROADCAST:
4295 if (ifr->ifr_hwaddr.sa_family != dev->type)
4297 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
4298 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
4299 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
4303 if (ops->ndo_set_config) {
4304 if (!netif_device_present(dev))
4306 return ops->ndo_set_config(dev, &ifr->ifr_map);
4311 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4312 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4314 if (!netif_device_present(dev))
4316 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
4320 if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
4321 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
4323 if (!netif_device_present(dev))
4325 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
4329 if (ifr->ifr_qlen < 0)
4331 dev->tx_queue_len = ifr->ifr_qlen;
4335 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
4336 return dev_change_name(dev, ifr->ifr_newname);
4339 * Unknown or private ioctl
4343 if ((cmd >= SIOCDEVPRIVATE &&
4344 cmd <= SIOCDEVPRIVATE + 15) ||
4345 cmd == SIOCBONDENSLAVE ||
4346 cmd == SIOCBONDRELEASE ||
4347 cmd == SIOCBONDSETHWADDR ||
4348 cmd == SIOCBONDSLAVEINFOQUERY ||
4349 cmd == SIOCBONDINFOQUERY ||
4350 cmd == SIOCBONDCHANGEACTIVE ||
4351 cmd == SIOCGMIIPHY ||
4352 cmd == SIOCGMIIREG ||
4353 cmd == SIOCSMIIREG ||
4354 cmd == SIOCBRADDIF ||
4355 cmd == SIOCBRDELIF ||
4356 cmd == SIOCSHWTSTAMP ||
4357 cmd == SIOCWANDEV) {
4359 if (ops->ndo_do_ioctl) {
4360 if (netif_device_present(dev))
4361 err = ops->ndo_do_ioctl(dev, ifr, cmd);
4373 * This function handles all "interface"-type I/O control requests. The actual
4374 * 'doing' part of this is dev_ifsioc above.
4378 * dev_ioctl - network device ioctl
4379 * @net: the applicable net namespace
4380 * @cmd: command to issue
4381 * @arg: pointer to a struct ifreq in user space
4383 * Issue ioctl functions to devices. This is normally called by the
4384 * user space syscall interfaces but can sometimes be useful for
4385 * other purposes. The return value is the return from the syscall if
4386 * positive or a negative errno code on error.
4389 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
4395 /* One special case: SIOCGIFCONF takes ifconf argument
4396 and requires shared lock, because it sleeps writing
4400 if (cmd == SIOCGIFCONF) {
4402 ret = dev_ifconf(net, (char __user *) arg);
4406 if (cmd == SIOCGIFNAME)
4407 return dev_ifname(net, (struct ifreq __user *)arg);
4409 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
4412 ifr.ifr_name[IFNAMSIZ-1] = 0;
4414 colon = strchr(ifr.ifr_name, ':');
4419 * See which interface the caller is talking about.
4424 * These ioctl calls:
4425 * - can be done by all.
4426 * - atomic and do not require locking.
4437 dev_load(net, ifr.ifr_name);
4438 read_lock(&dev_base_lock);
4439 ret = dev_ifsioc_locked(net, &ifr, cmd);
4440 read_unlock(&dev_base_lock);
4444 if (copy_to_user(arg, &ifr,
4445 sizeof(struct ifreq)))
4451 dev_load(net, ifr.ifr_name);
4453 ret = dev_ethtool(net, &ifr);
4458 if (copy_to_user(arg, &ifr,
4459 sizeof(struct ifreq)))
4465 * These ioctl calls:
4466 * - require superuser power.
4467 * - require strict serialization.
4473 if (!capable(CAP_NET_ADMIN))
4475 dev_load(net, ifr.ifr_name);
4477 ret = dev_ifsioc(net, &ifr, cmd);
4482 if (copy_to_user(arg, &ifr,
4483 sizeof(struct ifreq)))
4489 * These ioctl calls:
4490 * - require superuser power.
4491 * - require strict serialization.
4492 * - do not return a value
4502 case SIOCSIFHWBROADCAST:
4505 case SIOCBONDENSLAVE:
4506 case SIOCBONDRELEASE:
4507 case SIOCBONDSETHWADDR:
4508 case SIOCBONDCHANGEACTIVE:
4512 if (!capable(CAP_NET_ADMIN))
4515 case SIOCBONDSLAVEINFOQUERY:
4516 case SIOCBONDINFOQUERY:
4517 dev_load(net, ifr.ifr_name);
4519 ret = dev_ifsioc(net, &ifr, cmd);
4524 /* Get the per device memory space. We can add this but
4525 * currently do not support it */
4527 /* Set the per device memory buffer space.
4528 * Not applicable in our case */
4533 * Unknown or private ioctl.
4536 if (cmd == SIOCWANDEV ||
4537 (cmd >= SIOCDEVPRIVATE &&
4538 cmd <= SIOCDEVPRIVATE + 15)) {
4539 dev_load(net, ifr.ifr_name);
4541 ret = dev_ifsioc(net, &ifr, cmd);
4543 if (!ret && copy_to_user(arg, &ifr,
4544 sizeof(struct ifreq)))
4548 /* Take care of Wireless Extensions */
4549 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
4550 return wext_handle_ioctl(net, &ifr, cmd, arg);
4557 * dev_new_index - allocate an ifindex
4558 * @net: the applicable net namespace
4560 * Returns a suitable unique value for a new device interface
4561 * number. The caller must hold the rtnl semaphore or the
4562 * dev_base_lock to be sure it remains unique.
4564 static int dev_new_index(struct net *net)
4570 if (!__dev_get_by_index(net, ifindex))
4575 /* Delayed registration/unregisteration */
4576 static LIST_HEAD(net_todo_list);
4578 static void net_set_todo(struct net_device *dev)
4580 list_add_tail(&dev->todo_list, &net_todo_list);
4583 static void rollback_registered(struct net_device *dev)
4585 BUG_ON(dev_boot_phase);
4588 /* Some devices call without registering for initialization unwind. */
4589 if (dev->reg_state == NETREG_UNINITIALIZED) {
4590 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
4591 "was registered\n", dev->name, dev);
4597 BUG_ON(dev->reg_state != NETREG_REGISTERED);
4599 /* If device is running, close it first. */
4602 /* And unlink it from device chain. */
4603 unlist_netdevice(dev);
4605 dev->reg_state = NETREG_UNREGISTERING;
4609 /* Shutdown queueing discipline. */
4613 /* Notify protocols, that we are about to destroy
4614 this device. They should clean all the things.
4616 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4619 * Flush the unicast and multicast chains
4621 dev_unicast_flush(dev);
4622 dev_addr_discard(dev);
4624 if (dev->netdev_ops->ndo_uninit)
4625 dev->netdev_ops->ndo_uninit(dev);
4627 /* Notifier chain MUST detach us from master device. */
4628 WARN_ON(dev->master);
4630 /* Remove entries from kobject tree */
4631 netdev_unregister_kobject(dev);
4638 static void __netdev_init_queue_locks_one(struct net_device *dev,
4639 struct netdev_queue *dev_queue,
4642 spin_lock_init(&dev_queue->_xmit_lock);
4643 netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type);
4644 dev_queue->xmit_lock_owner = -1;
4647 static void netdev_init_queue_locks(struct net_device *dev)
4649 netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL);
4650 __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL);
4653 unsigned long netdev_fix_features(unsigned long features, const char *name)
4655 /* Fix illegal SG+CSUM combinations. */
4656 if ((features & NETIF_F_SG) &&
4657 !(features & NETIF_F_ALL_CSUM)) {
4659 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no "
4660 "checksum feature.\n", name);
4661 features &= ~NETIF_F_SG;
4664 /* TSO requires that SG is present as well. */
4665 if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) {
4667 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no "
4668 "SG feature.\n", name);
4669 features &= ~NETIF_F_TSO;
4672 if (features & NETIF_F_UFO) {
4673 if (!(features & NETIF_F_GEN_CSUM)) {
4675 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4676 "since no NETIF_F_HW_CSUM feature.\n",
4678 features &= ~NETIF_F_UFO;
4681 if (!(features & NETIF_F_SG)) {
4683 printk(KERN_ERR "%s: Dropping NETIF_F_UFO "
4684 "since no NETIF_F_SG feature.\n", name);
4685 features &= ~NETIF_F_UFO;
4691 EXPORT_SYMBOL(netdev_fix_features);
4694 * register_netdevice - register a network device
4695 * @dev: device to register
4697 * Take a completed network device structure and add it to the kernel
4698 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4699 * chain. 0 is returned on success. A negative errno code is returned
4700 * on a failure to set up the device, or if the name is a duplicate.
4702 * Callers must hold the rtnl semaphore. You may want
4703 * register_netdev() instead of this.
4706 * The locking appears insufficient to guarantee two parallel registers
4707 * will not get the same name.
4710 int register_netdevice(struct net_device *dev)
4712 struct hlist_head *head;
4713 struct hlist_node *p;
4715 struct net *net = dev_net(dev);
4717 BUG_ON(dev_boot_phase);
4722 /* When net_device's are persistent, this will be fatal. */
4723 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
4726 spin_lock_init(&dev->addr_list_lock);
4727 netdev_set_addr_lockdep_class(dev);
4728 netdev_init_queue_locks(dev);
4732 /* Init, if this function is available */
4733 if (dev->netdev_ops->ndo_init) {
4734 ret = dev->netdev_ops->ndo_init(dev);
4742 if (!dev_valid_name(dev->name)) {
4747 dev->ifindex = dev_new_index(net);
4748 if (dev->iflink == -1)
4749 dev->iflink = dev->ifindex;
4751 /* Check for existence of name */
4752 head = dev_name_hash(net, dev->name);
4753 hlist_for_each(p, head) {
4754 struct net_device *d
4755 = hlist_entry(p, struct net_device, name_hlist);
4756 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
4762 /* Fix illegal checksum combinations */
4763 if ((dev->features & NETIF_F_HW_CSUM) &&
4764 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4765 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
4767 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
4770 if ((dev->features & NETIF_F_NO_CSUM) &&
4771 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
4772 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
4774 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
4777 dev->features = netdev_fix_features(dev->features, dev->name);
4779 /* Enable software GSO if SG is supported. */
4780 if (dev->features & NETIF_F_SG)
4781 dev->features |= NETIF_F_GSO;
4783 netdev_initialize_kobject(dev);
4784 ret = netdev_register_kobject(dev);
4787 dev->reg_state = NETREG_REGISTERED;
4790 * Default initial state at registry is that the
4791 * device is present.
4794 set_bit(__LINK_STATE_PRESENT, &dev->state);
4796 dev_init_scheduler(dev);
4798 list_netdevice(dev);
4800 /* Notify protocols, that a new device appeared. */
4801 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
4802 ret = notifier_to_errno(ret);
4804 rollback_registered(dev);
4805 dev->reg_state = NETREG_UNREGISTERED;
4812 if (dev->netdev_ops->ndo_uninit)
4813 dev->netdev_ops->ndo_uninit(dev);
4818 * init_dummy_netdev - init a dummy network device for NAPI
4819 * @dev: device to init
4821 * This takes a network device structure and initialize the minimum
4822 * amount of fields so it can be used to schedule NAPI polls without
4823 * registering a full blown interface. This is to be used by drivers
4824 * that need to tie several hardware interfaces to a single NAPI
4825 * poll scheduler due to HW limitations.
4827 int init_dummy_netdev(struct net_device *dev)
4829 /* Clear everything. Note we don't initialize spinlocks
4830 * are they aren't supposed to be taken by any of the
4831 * NAPI code and this dummy netdev is supposed to be
4832 * only ever used for NAPI polls
4834 memset(dev, 0, sizeof(struct net_device));
4836 /* make sure we BUG if trying to hit standard
4837 * register/unregister code path
4839 dev->reg_state = NETREG_DUMMY;
4841 /* initialize the ref count */
4842 atomic_set(&dev->refcnt, 1);
4844 /* NAPI wants this */
4845 INIT_LIST_HEAD(&dev->napi_list);
4847 /* a dummy interface is started by default */
4848 set_bit(__LINK_STATE_PRESENT, &dev->state);
4849 set_bit(__LINK_STATE_START, &dev->state);
4853 EXPORT_SYMBOL_GPL(init_dummy_netdev);
4857 * register_netdev - register a network device
4858 * @dev: device to register
4860 * Take a completed network device structure and add it to the kernel
4861 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
4862 * chain. 0 is returned on success. A negative errno code is returned
4863 * on a failure to set up the device, or if the name is a duplicate.
4865 * This is a wrapper around register_netdevice that takes the rtnl semaphore
4866 * and expands the device name if you passed a format string to
4869 int register_netdev(struct net_device *dev)
4876 * If the name is a format string the caller wants us to do a
4879 if (strchr(dev->name, '%')) {
4880 err = dev_alloc_name(dev, dev->name);
4885 err = register_netdevice(dev);
4890 EXPORT_SYMBOL(register_netdev);
4893 * netdev_wait_allrefs - wait until all references are gone.
4895 * This is called when unregistering network devices.
4897 * Any protocol or device that holds a reference should register
4898 * for netdevice notification, and cleanup and put back the
4899 * reference if they receive an UNREGISTER event.
4900 * We can get stuck here if buggy protocols don't correctly
4903 static void netdev_wait_allrefs(struct net_device *dev)
4905 unsigned long rebroadcast_time, warning_time;
4907 rebroadcast_time = warning_time = jiffies;
4908 while (atomic_read(&dev->refcnt) != 0) {
4909 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
4912 /* Rebroadcast unregister notification */
4913 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4915 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
4917 /* We must not have linkwatch events
4918 * pending on unregister. If this
4919 * happens, we simply run the queue
4920 * unscheduled, resulting in a noop
4923 linkwatch_run_queue();
4928 rebroadcast_time = jiffies;
4933 if (time_after(jiffies, warning_time + 10 * HZ)) {
4934 printk(KERN_EMERG "unregister_netdevice: "
4935 "waiting for %s to become free. Usage "
4937 dev->name, atomic_read(&dev->refcnt));
4938 warning_time = jiffies;
4947 * register_netdevice(x1);
4948 * register_netdevice(x2);
4950 * unregister_netdevice(y1);
4951 * unregister_netdevice(y2);
4957 * We are invoked by rtnl_unlock().
4958 * This allows us to deal with problems:
4959 * 1) We can delete sysfs objects which invoke hotplug
4960 * without deadlocking with linkwatch via keventd.
4961 * 2) Since we run with the RTNL semaphore not held, we can sleep
4962 * safely in order to wait for the netdev refcnt to drop to zero.
4964 * We must not return until all unregister events added during
4965 * the interval the lock was held have been completed.
4967 void netdev_run_todo(void)
4969 struct list_head list;
4971 /* Snapshot list, allow later requests */
4972 list_replace_init(&net_todo_list, &list);
4976 while (!list_empty(&list)) {
4977 struct net_device *dev
4978 = list_entry(list.next, struct net_device, todo_list);
4979 list_del(&dev->todo_list);
4981 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
4982 printk(KERN_ERR "network todo '%s' but state %d\n",
4983 dev->name, dev->reg_state);
4988 dev->reg_state = NETREG_UNREGISTERED;
4990 on_each_cpu(flush_backlog, dev, 1);
4992 netdev_wait_allrefs(dev);
4995 BUG_ON(atomic_read(&dev->refcnt));
4996 WARN_ON(dev->ip_ptr);
4997 WARN_ON(dev->ip6_ptr);
4998 WARN_ON(dev->dn_ptr);
5000 if (dev->destructor)
5001 dev->destructor(dev);
5003 /* Free network device */
5004 kobject_put(&dev->dev.kobj);
5009 * dev_get_stats - get network device statistics
5010 * @dev: device to get statistics from
5012 * Get network statistics from device. The device driver may provide
5013 * its own method by setting dev->netdev_ops->get_stats; otherwise
5014 * the internal statistics structure is used.
5016 const struct net_device_stats *dev_get_stats(struct net_device *dev)
5018 const struct net_device_ops *ops = dev->netdev_ops;
5020 if (ops->ndo_get_stats)
5021 return ops->ndo_get_stats(dev);
5023 unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0;
5024 struct net_device_stats *stats = &dev->stats;
5026 struct netdev_queue *txq;
5028 for (i = 0; i < dev->num_tx_queues; i++) {
5029 txq = netdev_get_tx_queue(dev, i);
5030 tx_bytes += txq->tx_bytes;
5031 tx_packets += txq->tx_packets;
5032 tx_dropped += txq->tx_dropped;
5034 if (tx_bytes || tx_packets || tx_dropped) {
5035 stats->tx_bytes = tx_bytes;
5036 stats->tx_packets = tx_packets;
5037 stats->tx_dropped = tx_dropped;
5042 EXPORT_SYMBOL(dev_get_stats);
5044 static void netdev_init_one_queue(struct net_device *dev,
5045 struct netdev_queue *queue,
5051 static void netdev_init_queues(struct net_device *dev)
5053 netdev_init_one_queue(dev, &dev->rx_queue, NULL);
5054 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
5055 spin_lock_init(&dev->tx_global_lock);
5059 * alloc_netdev_mq - allocate network device
5060 * @sizeof_priv: size of private data to allocate space for
5061 * @name: device name format string
5062 * @setup: callback to initialize device
5063 * @queue_count: the number of subqueues to allocate
5065 * Allocates a struct net_device with private data area for driver use
5066 * and performs basic initialization. Also allocates subquue structs
5067 * for each queue on the device at the end of the netdevice.
5069 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
5070 void (*setup)(struct net_device *), unsigned int queue_count)
5072 struct netdev_queue *tx;
5073 struct net_device *dev;
5075 struct net_device *p;
5077 BUG_ON(strlen(name) >= sizeof(dev->name));
5079 alloc_size = sizeof(struct net_device);
5081 /* ensure 32-byte alignment of private area */
5082 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
5083 alloc_size += sizeof_priv;
5085 /* ensure 32-byte alignment of whole construct */
5086 alloc_size += NETDEV_ALIGN - 1;
5088 p = kzalloc(alloc_size, GFP_KERNEL);
5090 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
5094 tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL);
5096 printk(KERN_ERR "alloc_netdev: Unable to allocate "
5101 dev = PTR_ALIGN(p, NETDEV_ALIGN);
5102 dev->padded = (char *)dev - (char *)p;
5104 if (dev_addr_init(dev))
5107 dev_unicast_init(dev);
5109 dev_net_set(dev, &init_net);
5112 dev->num_tx_queues = queue_count;
5113 dev->real_num_tx_queues = queue_count;
5115 dev->gso_max_size = GSO_MAX_SIZE;
5117 netdev_init_queues(dev);
5119 INIT_LIST_HEAD(&dev->napi_list);
5120 dev->priv_flags = IFF_XMIT_DST_RELEASE;
5122 strcpy(dev->name, name);
5132 EXPORT_SYMBOL(alloc_netdev_mq);
5135 * free_netdev - free network device
5138 * This function does the last stage of destroying an allocated device
5139 * interface. The reference to the device object is released.
5140 * If this is the last reference then it will be freed.
5142 void free_netdev(struct net_device *dev)
5144 struct napi_struct *p, *n;
5146 release_net(dev_net(dev));
5150 /* Flush device addresses */
5151 dev_addr_flush(dev);
5153 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
5156 /* Compatibility with error handling in drivers */
5157 if (dev->reg_state == NETREG_UNINITIALIZED) {
5158 kfree((char *)dev - dev->padded);
5162 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
5163 dev->reg_state = NETREG_RELEASED;
5165 /* will free via device release */
5166 put_device(&dev->dev);
5170 * synchronize_net - Synchronize with packet receive processing
5172 * Wait for packets currently being received to be done.
5173 * Does not block later packets from starting.
5175 void synchronize_net(void)
5182 * unregister_netdevice - remove device from the kernel
5185 * This function shuts down a device interface and removes it
5186 * from the kernel tables.
5188 * Callers must hold the rtnl semaphore. You may want
5189 * unregister_netdev() instead of this.
5192 void unregister_netdevice(struct net_device *dev)
5196 rollback_registered(dev);
5197 /* Finish processing unregister after unlock */
5202 * unregister_netdev - remove device from the kernel
5205 * This function shuts down a device interface and removes it
5206 * from the kernel tables.
5208 * This is just a wrapper for unregister_netdevice that takes
5209 * the rtnl semaphore. In general you want to use this and not
5210 * unregister_netdevice.
5212 void unregister_netdev(struct net_device *dev)
5215 unregister_netdevice(dev);
5219 EXPORT_SYMBOL(unregister_netdev);
5222 * dev_change_net_namespace - move device to different nethost namespace
5224 * @net: network namespace
5225 * @pat: If not NULL name pattern to try if the current device name
5226 * is already taken in the destination network namespace.
5228 * This function shuts down a device interface and moves it
5229 * to a new network namespace. On success 0 is returned, on
5230 * a failure a netagive errno code is returned.
5232 * Callers must hold the rtnl semaphore.
5235 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
5238 const char *destname;
5243 /* Don't allow namespace local devices to be moved. */
5245 if (dev->features & NETIF_F_NETNS_LOCAL)
5249 /* Don't allow real devices to be moved when sysfs
5253 if (dev->dev.parent)
5257 /* Ensure the device has been registrered */
5259 if (dev->reg_state != NETREG_REGISTERED)
5262 /* Get out if there is nothing todo */
5264 if (net_eq(dev_net(dev), net))
5267 /* Pick the destination device name, and ensure
5268 * we can use it in the destination network namespace.
5271 destname = dev->name;
5272 if (__dev_get_by_name(net, destname)) {
5273 /* We get here if we can't use the current device name */
5276 if (!dev_valid_name(pat))
5278 if (strchr(pat, '%')) {
5279 if (__dev_alloc_name(net, pat, buf) < 0)
5284 if (__dev_get_by_name(net, destname))
5289 * And now a mini version of register_netdevice unregister_netdevice.
5292 /* If device is running close it first. */
5295 /* And unlink it from device chain */
5297 unlist_netdevice(dev);
5301 /* Shutdown queueing discipline. */
5304 /* Notify protocols, that we are about to destroy
5305 this device. They should clean all the things.
5307 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
5310 * Flush the unicast and multicast chains
5312 dev_unicast_flush(dev);
5313 dev_addr_discard(dev);
5315 netdev_unregister_kobject(dev);
5317 /* Actually switch the network namespace */
5318 dev_net_set(dev, net);
5320 /* Assign the new device name */
5321 if (destname != dev->name)
5322 strcpy(dev->name, destname);
5324 /* If there is an ifindex conflict assign a new one */
5325 if (__dev_get_by_index(net, dev->ifindex)) {
5326 int iflink = (dev->iflink == dev->ifindex);
5327 dev->ifindex = dev_new_index(net);
5329 dev->iflink = dev->ifindex;
5332 /* Fixup kobjects */
5333 err = netdev_register_kobject(dev);
5336 /* Add the device back in the hashes */
5337 list_netdevice(dev);
5339 /* Notify protocols, that a new device appeared. */
5340 call_netdevice_notifiers(NETDEV_REGISTER, dev);
5348 static int dev_cpu_callback(struct notifier_block *nfb,
5349 unsigned long action,
5352 struct sk_buff **list_skb;
5353 struct Qdisc **list_net;
5354 struct sk_buff *skb;
5355 unsigned int cpu, oldcpu = (unsigned long)ocpu;
5356 struct softnet_data *sd, *oldsd;
5358 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
5361 local_irq_disable();
5362 cpu = smp_processor_id();
5363 sd = &per_cpu(softnet_data, cpu);
5364 oldsd = &per_cpu(softnet_data, oldcpu);
5366 /* Find end of our completion_queue. */
5367 list_skb = &sd->completion_queue;
5369 list_skb = &(*list_skb)->next;
5370 /* Append completion queue from offline CPU. */
5371 *list_skb = oldsd->completion_queue;
5372 oldsd->completion_queue = NULL;
5374 /* Find end of our output_queue. */
5375 list_net = &sd->output_queue;
5377 list_net = &(*list_net)->next_sched;
5378 /* Append output queue from offline CPU. */
5379 *list_net = oldsd->output_queue;
5380 oldsd->output_queue = NULL;
5382 raise_softirq_irqoff(NET_TX_SOFTIRQ);
5385 /* Process offline CPU's input_pkt_queue */
5386 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
5394 * netdev_increment_features - increment feature set by one
5395 * @all: current feature set
5396 * @one: new feature set
5397 * @mask: mask feature set
5399 * Computes a new feature set after adding a device with feature set
5400 * @one to the master device with current feature set @all. Will not
5401 * enable anything that is off in @mask. Returns the new feature set.
5403 unsigned long netdev_increment_features(unsigned long all, unsigned long one,
5406 /* If device needs checksumming, downgrade to it. */
5407 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
5408 all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM);
5409 else if (mask & NETIF_F_ALL_CSUM) {
5410 /* If one device supports v4/v6 checksumming, set for all. */
5411 if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) &&
5412 !(all & NETIF_F_GEN_CSUM)) {
5413 all &= ~NETIF_F_ALL_CSUM;
5414 all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
5417 /* If one device supports hw checksumming, set for all. */
5418 if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) {
5419 all &= ~NETIF_F_ALL_CSUM;
5420 all |= NETIF_F_HW_CSUM;
5424 one |= NETIF_F_ALL_CSUM;
5426 one |= all & NETIF_F_ONE_FOR_ALL;
5427 all &= one | NETIF_F_LLTX | NETIF_F_GSO;
5428 all |= one & mask & NETIF_F_ONE_FOR_ALL;
5432 EXPORT_SYMBOL(netdev_increment_features);
5434 static struct hlist_head *netdev_create_hash(void)
5437 struct hlist_head *hash;
5439 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
5441 for (i = 0; i < NETDEV_HASHENTRIES; i++)
5442 INIT_HLIST_HEAD(&hash[i]);
5447 /* Initialize per network namespace state */
5448 static int __net_init netdev_init(struct net *net)
5450 INIT_LIST_HEAD(&net->dev_base_head);
5452 net->dev_name_head = netdev_create_hash();
5453 if (net->dev_name_head == NULL)
5456 net->dev_index_head = netdev_create_hash();
5457 if (net->dev_index_head == NULL)
5463 kfree(net->dev_name_head);
5469 * netdev_drivername - network driver for the device
5470 * @dev: network device
5471 * @buffer: buffer for resulting name
5472 * @len: size of buffer
5474 * Determine network driver for device.
5476 char *netdev_drivername(const struct net_device *dev, char *buffer, int len)
5478 const struct device_driver *driver;
5479 const struct device *parent;
5481 if (len <= 0 || !buffer)
5485 parent = dev->dev.parent;
5490 driver = parent->driver;
5491 if (driver && driver->name)
5492 strlcpy(buffer, driver->name, len);
5496 static void __net_exit netdev_exit(struct net *net)
5498 kfree(net->dev_name_head);
5499 kfree(net->dev_index_head);
5502 static struct pernet_operations __net_initdata netdev_net_ops = {
5503 .init = netdev_init,
5504 .exit = netdev_exit,
5507 static void __net_exit default_device_exit(struct net *net)
5509 struct net_device *dev;
5511 * Push all migratable of the network devices back to the
5512 * initial network namespace
5516 for_each_netdev(net, dev) {
5518 char fb_name[IFNAMSIZ];
5520 /* Ignore unmoveable devices (i.e. loopback) */
5521 if (dev->features & NETIF_F_NETNS_LOCAL)
5524 /* Delete virtual devices */
5525 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) {
5526 dev->rtnl_link_ops->dellink(dev);
5530 /* Push remaing network devices to init_net */
5531 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
5532 err = dev_change_net_namespace(dev, &init_net, fb_name);
5534 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
5535 __func__, dev->name, err);
5543 static struct pernet_operations __net_initdata default_device_ops = {
5544 .exit = default_device_exit,
5548 * Initialize the DEV module. At boot time this walks the device list and
5549 * unhooks any devices that fail to initialise (normally hardware not
5550 * present) and leaves us with a valid list of present and active devices.
5555 * This is called single threaded during boot, so no need
5556 * to take the rtnl semaphore.
5558 static int __init net_dev_init(void)
5560 int i, rc = -ENOMEM;
5562 BUG_ON(!dev_boot_phase);
5564 if (dev_proc_init())
5567 if (netdev_kobject_init())
5570 INIT_LIST_HEAD(&ptype_all);
5571 for (i = 0; i < PTYPE_HASH_SIZE; i++)
5572 INIT_LIST_HEAD(&ptype_base[i]);
5574 if (register_pernet_subsys(&netdev_net_ops))
5578 * Initialise the packet receive queues.
5581 for_each_possible_cpu(i) {
5582 struct softnet_data *queue;
5584 queue = &per_cpu(softnet_data, i);
5585 skb_queue_head_init(&queue->input_pkt_queue);
5586 queue->completion_queue = NULL;
5587 INIT_LIST_HEAD(&queue->poll_list);
5589 queue->backlog.poll = process_backlog;
5590 queue->backlog.weight = weight_p;
5591 queue->backlog.gro_list = NULL;
5592 queue->backlog.gro_count = 0;
5597 /* The loopback device is special if any other network devices
5598 * is present in a network namespace the loopback device must
5599 * be present. Since we now dynamically allocate and free the
5600 * loopback device ensure this invariant is maintained by
5601 * keeping the loopback device as the first device on the
5602 * list of network devices. Ensuring the loopback devices
5603 * is the first device that appears and the last network device
5606 if (register_pernet_device(&loopback_net_ops))
5609 if (register_pernet_device(&default_device_ops))
5612 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
5613 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
5615 hotcpu_notifier(dev_cpu_callback, 0);
5623 subsys_initcall(net_dev_init);
5625 static int __init initialize_hashrnd(void)
5627 get_random_bytes(&skb_tx_hashrnd, sizeof(skb_tx_hashrnd));
5631 late_initcall_sync(initialize_hashrnd);
5633 EXPORT_SYMBOL(__dev_get_by_index);
5634 EXPORT_SYMBOL(__dev_get_by_name);
5635 EXPORT_SYMBOL(__dev_remove_pack);
5636 EXPORT_SYMBOL(dev_valid_name);
5637 EXPORT_SYMBOL(dev_add_pack);
5638 EXPORT_SYMBOL(dev_alloc_name);
5639 EXPORT_SYMBOL(dev_close);
5640 EXPORT_SYMBOL(dev_get_by_flags);
5641 EXPORT_SYMBOL(dev_get_by_index);
5642 EXPORT_SYMBOL(dev_get_by_name);
5643 EXPORT_SYMBOL(dev_open);
5644 EXPORT_SYMBOL(dev_queue_xmit);
5645 EXPORT_SYMBOL(dev_remove_pack);
5646 EXPORT_SYMBOL(dev_set_allmulti);
5647 EXPORT_SYMBOL(dev_set_promiscuity);
5648 EXPORT_SYMBOL(dev_change_flags);
5649 EXPORT_SYMBOL(dev_set_mtu);
5650 EXPORT_SYMBOL(dev_set_mac_address);
5651 EXPORT_SYMBOL(free_netdev);
5652 EXPORT_SYMBOL(netdev_boot_setup_check);
5653 EXPORT_SYMBOL(netdev_set_master);
5654 EXPORT_SYMBOL(netdev_state_change);
5655 EXPORT_SYMBOL(netif_receive_skb);
5656 EXPORT_SYMBOL(netif_rx);
5657 EXPORT_SYMBOL(register_gifconf);
5658 EXPORT_SYMBOL(register_netdevice);
5659 EXPORT_SYMBOL(register_netdevice_notifier);
5660 EXPORT_SYMBOL(skb_checksum_help);
5661 EXPORT_SYMBOL(synchronize_net);
5662 EXPORT_SYMBOL(unregister_netdevice);
5663 EXPORT_SYMBOL(unregister_netdevice_notifier);
5664 EXPORT_SYMBOL(net_enable_timestamp);
5665 EXPORT_SYMBOL(net_disable_timestamp);
5666 EXPORT_SYMBOL(dev_get_flags);
5668 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
5669 EXPORT_SYMBOL(br_handle_frame_hook);
5670 EXPORT_SYMBOL(br_fdb_get_hook);
5671 EXPORT_SYMBOL(br_fdb_put_hook);
5674 EXPORT_SYMBOL(dev_load);
5676 EXPORT_PER_CPU_SYMBOL(softnet_data);