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/kallsyms.h>
112 #include <linux/netpoll.h>
113 #include <linux/rcupdate.h>
114 #include <linux/delay.h>
115 #include <net/wext.h>
116 #include <net/iw_handler.h>
117 #include <asm/current.h>
118 #include <linux/audit.h>
119 #include <linux/dmaengine.h>
120 #include <linux/err.h>
121 #include <linux/ctype.h>
122 #include <linux/if_arp.h>
123 #include <linux/if_vlan.h>
125 #include "net-sysfs.h"
128 * The list of packet types we will receive (as opposed to discard)
129 * and the routines to invoke.
131 * Why 16. Because with 16 the only overlap we get on a hash of the
132 * low nibble of the protocol value is RARP/SNAP/X.25.
134 * NOTE: That is no longer true with the addition of VLAN tags. Not
135 * sure which should go first, but I bet it won't make much
136 * difference if we are running VLANs. The good news is that
137 * this protocol won't be in the list unless compiled in, so
138 * the average user (w/out VLANs) will not be adversely affected.
155 #define PTYPE_HASH_SIZE (16)
156 #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1)
158 static DEFINE_SPINLOCK(ptype_lock);
159 static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
160 static struct list_head ptype_all __read_mostly; /* Taps */
162 #ifdef CONFIG_NET_DMA
164 struct dma_client client;
166 cpumask_t channel_mask;
167 struct dma_chan **channels;
170 static enum dma_state_client
171 netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
172 enum dma_state state);
174 static struct net_dma net_dma = {
176 .event_callback = netdev_dma_event,
182 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
185 * Pure readers hold dev_base_lock for reading.
187 * Writers must hold the rtnl semaphore while they loop through the
188 * dev_base_head list, and hold dev_base_lock for writing when they do the
189 * actual updates. This allows pure readers to access the list even
190 * while a writer is preparing to update it.
192 * To put it another way, dev_base_lock is held for writing only to
193 * protect against pure readers; the rtnl semaphore provides the
194 * protection against other writers.
196 * See, for example usages, register_netdevice() and
197 * unregister_netdevice(), which must be called with the rtnl
200 DEFINE_RWLOCK(dev_base_lock);
202 EXPORT_SYMBOL(dev_base_lock);
204 #define NETDEV_HASHBITS 8
205 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
207 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
209 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
210 return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)];
213 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
215 return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)];
218 /* Device list insertion */
219 static int list_netdevice(struct net_device *dev)
221 struct net *net = dev_net(dev);
225 write_lock_bh(&dev_base_lock);
226 list_add_tail(&dev->dev_list, &net->dev_base_head);
227 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
228 hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex));
229 write_unlock_bh(&dev_base_lock);
233 /* Device list removal */
234 static void unlist_netdevice(struct net_device *dev)
238 /* Unlink dev from the device chain */
239 write_lock_bh(&dev_base_lock);
240 list_del(&dev->dev_list);
241 hlist_del(&dev->name_hlist);
242 hlist_del(&dev->index_hlist);
243 write_unlock_bh(&dev_base_lock);
250 static RAW_NOTIFIER_HEAD(netdev_chain);
253 * Device drivers call our routines to queue packets here. We empty the
254 * queue in the local softnet handler.
257 DEFINE_PER_CPU(struct softnet_data, softnet_data);
259 #ifdef CONFIG_DEBUG_LOCK_ALLOC
261 * register_netdevice() inits dev->_xmit_lock and sets lockdep class
262 * according to dev->type
264 static const unsigned short netdev_lock_type[] =
265 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
266 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
267 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
268 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
269 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
270 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
271 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
272 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
273 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
274 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
275 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
276 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
277 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
278 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_VOID,
281 static const char *netdev_lock_name[] =
282 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
283 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
284 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
285 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
286 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
287 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
288 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
289 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
290 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
291 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
292 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
293 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
294 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
295 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_VOID",
298 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
300 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
304 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
305 if (netdev_lock_type[i] == dev_type)
307 /* the last key is used by default */
308 return ARRAY_SIZE(netdev_lock_type) - 1;
311 static inline void netdev_set_lockdep_class(spinlock_t *lock,
312 unsigned short dev_type)
316 i = netdev_lock_pos(dev_type);
317 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
318 netdev_lock_name[i]);
321 static inline void netdev_set_lockdep_class(spinlock_t *lock,
322 unsigned short dev_type)
327 /*******************************************************************************
329 Protocol management and registration routines
331 *******************************************************************************/
334 * Add a protocol ID to the list. Now that the input handler is
335 * smarter we can dispense with all the messy stuff that used to be
338 * BEWARE!!! Protocol handlers, mangling input packets,
339 * MUST BE last in hash buckets and checking protocol handlers
340 * MUST start from promiscuous ptype_all chain in net_bh.
341 * It is true now, do not change it.
342 * Explanation follows: if protocol handler, mangling packet, will
343 * be the first on list, it is not able to sense, that packet
344 * is cloned and should be copied-on-write, so that it will
345 * change it and subsequent readers will get broken packet.
350 * dev_add_pack - add packet handler
351 * @pt: packet type declaration
353 * Add a protocol handler to the networking stack. The passed &packet_type
354 * is linked into kernel lists and may not be freed until it has been
355 * removed from the kernel lists.
357 * This call does not sleep therefore it can not
358 * guarantee all CPU's that are in middle of receiving packets
359 * will see the new packet type (until the next received packet).
362 void dev_add_pack(struct packet_type *pt)
366 spin_lock_bh(&ptype_lock);
367 if (pt->type == htons(ETH_P_ALL))
368 list_add_rcu(&pt->list, &ptype_all);
370 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
371 list_add_rcu(&pt->list, &ptype_base[hash]);
373 spin_unlock_bh(&ptype_lock);
377 * __dev_remove_pack - remove packet handler
378 * @pt: packet type declaration
380 * Remove a protocol handler that was previously added to the kernel
381 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
382 * from the kernel lists and can be freed or reused once this function
385 * The packet type might still be in use by receivers
386 * and must not be freed until after all the CPU's have gone
387 * through a quiescent state.
389 void __dev_remove_pack(struct packet_type *pt)
391 struct list_head *head;
392 struct packet_type *pt1;
394 spin_lock_bh(&ptype_lock);
396 if (pt->type == htons(ETH_P_ALL))
399 head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
401 list_for_each_entry(pt1, head, list) {
403 list_del_rcu(&pt->list);
408 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
410 spin_unlock_bh(&ptype_lock);
413 * dev_remove_pack - remove packet handler
414 * @pt: packet type declaration
416 * Remove a protocol handler that was previously added to the kernel
417 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
418 * from the kernel lists and can be freed or reused once this function
421 * This call sleeps to guarantee that no CPU is looking at the packet
424 void dev_remove_pack(struct packet_type *pt)
426 __dev_remove_pack(pt);
431 /******************************************************************************
433 Device Boot-time Settings Routines
435 *******************************************************************************/
437 /* Boot time configuration table */
438 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
441 * netdev_boot_setup_add - add new setup entry
442 * @name: name of the device
443 * @map: configured settings for the device
445 * Adds new setup entry to the dev_boot_setup list. The function
446 * returns 0 on error and 1 on success. This is a generic routine to
449 static int netdev_boot_setup_add(char *name, struct ifmap *map)
451 struct netdev_boot_setup *s;
455 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
456 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
457 memset(s[i].name, 0, sizeof(s[i].name));
458 strlcpy(s[i].name, name, IFNAMSIZ);
459 memcpy(&s[i].map, map, sizeof(s[i].map));
464 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
468 * netdev_boot_setup_check - check boot time settings
469 * @dev: the netdevice
471 * Check boot time settings for the device.
472 * The found settings are set for the device to be used
473 * later in the device probing.
474 * Returns 0 if no settings found, 1 if they are.
476 int netdev_boot_setup_check(struct net_device *dev)
478 struct netdev_boot_setup *s = dev_boot_setup;
481 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
482 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
483 !strcmp(dev->name, s[i].name)) {
484 dev->irq = s[i].map.irq;
485 dev->base_addr = s[i].map.base_addr;
486 dev->mem_start = s[i].map.mem_start;
487 dev->mem_end = s[i].map.mem_end;
496 * netdev_boot_base - get address from boot time settings
497 * @prefix: prefix for network device
498 * @unit: id for network device
500 * Check boot time settings for the base address of device.
501 * The found settings are set for the device to be used
502 * later in the device probing.
503 * Returns 0 if no settings found.
505 unsigned long netdev_boot_base(const char *prefix, int unit)
507 const struct netdev_boot_setup *s = dev_boot_setup;
511 sprintf(name, "%s%d", prefix, unit);
514 * If device already registered then return base of 1
515 * to indicate not to probe for this interface
517 if (__dev_get_by_name(&init_net, name))
520 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
521 if (!strcmp(name, s[i].name))
522 return s[i].map.base_addr;
527 * Saves at boot time configured settings for any netdevice.
529 int __init netdev_boot_setup(char *str)
534 str = get_options(str, ARRAY_SIZE(ints), ints);
539 memset(&map, 0, sizeof(map));
543 map.base_addr = ints[2];
545 map.mem_start = ints[3];
547 map.mem_end = ints[4];
549 /* Add new entry to the list */
550 return netdev_boot_setup_add(str, &map);
553 __setup("netdev=", netdev_boot_setup);
555 /*******************************************************************************
557 Device Interface Subroutines
559 *******************************************************************************/
562 * __dev_get_by_name - find a device by its name
563 * @net: the applicable net namespace
564 * @name: name to find
566 * Find an interface by name. Must be called under RTNL semaphore
567 * or @dev_base_lock. If the name is found a pointer to the device
568 * is returned. If the name is not found then %NULL is returned. The
569 * reference counters are not incremented so the caller must be
570 * careful with locks.
573 struct net_device *__dev_get_by_name(struct net *net, const char *name)
575 struct hlist_node *p;
577 hlist_for_each(p, dev_name_hash(net, name)) {
578 struct net_device *dev
579 = hlist_entry(p, struct net_device, name_hlist);
580 if (!strncmp(dev->name, name, IFNAMSIZ))
587 * dev_get_by_name - find a device by its name
588 * @net: the applicable net namespace
589 * @name: name to find
591 * Find an interface by name. This can be called from any
592 * context and does its own locking. The returned handle has
593 * the usage count incremented and the caller must use dev_put() to
594 * release it when it is no longer needed. %NULL is returned if no
595 * matching device is found.
598 struct net_device *dev_get_by_name(struct net *net, const char *name)
600 struct net_device *dev;
602 read_lock(&dev_base_lock);
603 dev = __dev_get_by_name(net, name);
606 read_unlock(&dev_base_lock);
611 * __dev_get_by_index - find a device by its ifindex
612 * @net: the applicable net namespace
613 * @ifindex: index of device
615 * Search for an interface by index. Returns %NULL if the device
616 * is not found or a pointer to the device. The device has not
617 * had its reference counter increased so the caller must be careful
618 * about locking. The caller must hold either the RTNL semaphore
622 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
624 struct hlist_node *p;
626 hlist_for_each(p, dev_index_hash(net, ifindex)) {
627 struct net_device *dev
628 = hlist_entry(p, struct net_device, index_hlist);
629 if (dev->ifindex == ifindex)
637 * dev_get_by_index - find a device by its ifindex
638 * @net: the applicable net namespace
639 * @ifindex: index of device
641 * Search for an interface by index. Returns NULL if the device
642 * is not found or a pointer to the device. The device returned has
643 * had a reference added and the pointer is safe until the user calls
644 * dev_put to indicate they have finished with it.
647 struct net_device *dev_get_by_index(struct net *net, int ifindex)
649 struct net_device *dev;
651 read_lock(&dev_base_lock);
652 dev = __dev_get_by_index(net, ifindex);
655 read_unlock(&dev_base_lock);
660 * dev_getbyhwaddr - find a device by its hardware address
661 * @net: the applicable net namespace
662 * @type: media type of device
663 * @ha: hardware address
665 * Search for an interface by MAC address. Returns NULL if the device
666 * is not found or a pointer to the device. The caller must hold the
667 * rtnl semaphore. The returned device has not had its ref count increased
668 * and the caller must therefore be careful about locking
671 * If the API was consistent this would be __dev_get_by_hwaddr
674 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
676 struct net_device *dev;
680 for_each_netdev(net, dev)
681 if (dev->type == type &&
682 !memcmp(dev->dev_addr, ha, dev->addr_len))
688 EXPORT_SYMBOL(dev_getbyhwaddr);
690 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
692 struct net_device *dev;
695 for_each_netdev(net, dev)
696 if (dev->type == type)
702 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
704 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
706 struct net_device *dev;
709 dev = __dev_getfirstbyhwtype(net, type);
716 EXPORT_SYMBOL(dev_getfirstbyhwtype);
719 * dev_get_by_flags - find any device with given flags
720 * @net: the applicable net namespace
721 * @if_flags: IFF_* values
722 * @mask: bitmask of bits in if_flags to check
724 * Search for any interface with the given flags. Returns NULL if a device
725 * is not found or a pointer to the device. The device returned has
726 * had a reference added and the pointer is safe until the user calls
727 * dev_put to indicate they have finished with it.
730 struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask)
732 struct net_device *dev, *ret;
735 read_lock(&dev_base_lock);
736 for_each_netdev(net, dev) {
737 if (((dev->flags ^ if_flags) & mask) == 0) {
743 read_unlock(&dev_base_lock);
748 * dev_valid_name - check if name is okay for network device
751 * Network device names need to be valid file names to
752 * to allow sysfs to work. We also disallow any kind of
755 int dev_valid_name(const char *name)
759 if (strlen(name) >= IFNAMSIZ)
761 if (!strcmp(name, ".") || !strcmp(name, ".."))
765 if (*name == '/' || isspace(*name))
773 * __dev_alloc_name - allocate a name for a device
774 * @net: network namespace to allocate the device name in
775 * @name: name format string
776 * @buf: scratch buffer and result name string
778 * Passed a format string - eg "lt%d" it will try and find a suitable
779 * id. It scans list of devices to build up a free map, then chooses
780 * the first empty slot. The caller must hold the dev_base or rtnl lock
781 * while allocating the name and adding the device in order to avoid
783 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
784 * Returns the number of the unit assigned or a negative errno code.
787 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
791 const int max_netdevices = 8*PAGE_SIZE;
792 unsigned long *inuse;
793 struct net_device *d;
795 p = strnchr(name, IFNAMSIZ-1, '%');
798 * Verify the string as this thing may have come from
799 * the user. There must be either one "%d" and no other "%"
802 if (p[1] != 'd' || strchr(p + 2, '%'))
805 /* Use one page as a bit array of possible slots */
806 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
810 for_each_netdev(net, d) {
811 if (!sscanf(d->name, name, &i))
813 if (i < 0 || i >= max_netdevices)
816 /* avoid cases where sscanf is not exact inverse of printf */
817 snprintf(buf, IFNAMSIZ, name, i);
818 if (!strncmp(buf, d->name, IFNAMSIZ))
822 i = find_first_zero_bit(inuse, max_netdevices);
823 free_page((unsigned long) inuse);
826 snprintf(buf, IFNAMSIZ, name, i);
827 if (!__dev_get_by_name(net, buf))
830 /* It is possible to run out of possible slots
831 * when the name is long and there isn't enough space left
832 * for the digits, or if all bits are used.
838 * dev_alloc_name - allocate a name for a device
840 * @name: name format string
842 * Passed a format string - eg "lt%d" it will try and find a suitable
843 * id. It scans list of devices to build up a free map, then chooses
844 * the first empty slot. The caller must hold the dev_base or rtnl lock
845 * while allocating the name and adding the device in order to avoid
847 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
848 * Returns the number of the unit assigned or a negative errno code.
851 int dev_alloc_name(struct net_device *dev, const char *name)
857 BUG_ON(!dev_net(dev));
859 ret = __dev_alloc_name(net, name, buf);
861 strlcpy(dev->name, buf, IFNAMSIZ);
867 * dev_change_name - change name of a device
869 * @newname: name (or format string) must be at least IFNAMSIZ
871 * Change name of a device, can pass format strings "eth%d".
874 int dev_change_name(struct net_device *dev, char *newname)
876 char oldname[IFNAMSIZ];
882 BUG_ON(!dev_net(dev));
885 if (dev->flags & IFF_UP)
888 if (!dev_valid_name(newname))
891 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
894 memcpy(oldname, dev->name, IFNAMSIZ);
896 if (strchr(newname, '%')) {
897 err = dev_alloc_name(dev, newname);
900 strcpy(newname, dev->name);
902 else if (__dev_get_by_name(net, newname))
905 strlcpy(dev->name, newname, IFNAMSIZ);
908 err = device_rename(&dev->dev, dev->name);
910 memcpy(dev->name, oldname, IFNAMSIZ);
914 write_lock_bh(&dev_base_lock);
915 hlist_del(&dev->name_hlist);
916 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
917 write_unlock_bh(&dev_base_lock);
919 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
920 ret = notifier_to_errno(ret);
925 "%s: name change rollback failed: %d.\n",
929 memcpy(dev->name, oldname, IFNAMSIZ);
938 * netdev_features_change - device changes features
939 * @dev: device to cause notification
941 * Called to indicate a device has changed features.
943 void netdev_features_change(struct net_device *dev)
945 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
947 EXPORT_SYMBOL(netdev_features_change);
950 * netdev_state_change - device changes state
951 * @dev: device to cause notification
953 * Called to indicate a device has changed state. This function calls
954 * the notifier chains for netdev_chain and sends a NEWLINK message
955 * to the routing socket.
957 void netdev_state_change(struct net_device *dev)
959 if (dev->flags & IFF_UP) {
960 call_netdevice_notifiers(NETDEV_CHANGE, dev);
961 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
965 void netdev_bonding_change(struct net_device *dev)
967 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev);
969 EXPORT_SYMBOL(netdev_bonding_change);
972 * dev_load - load a network module
973 * @net: the applicable net namespace
974 * @name: name of interface
976 * If a network interface is not present and the process has suitable
977 * privileges this function loads the module. If module loading is not
978 * available in this kernel then it becomes a nop.
981 void dev_load(struct net *net, const char *name)
983 struct net_device *dev;
985 read_lock(&dev_base_lock);
986 dev = __dev_get_by_name(net, name);
987 read_unlock(&dev_base_lock);
989 if (!dev && capable(CAP_SYS_MODULE))
990 request_module("%s", name);
994 * dev_open - prepare an interface for use.
995 * @dev: device to open
997 * Takes a device from down to up state. The device's private open
998 * function is invoked and then the multicast lists are loaded. Finally
999 * the device is moved into the up state and a %NETDEV_UP message is
1000 * sent to the netdev notifier chain.
1002 * Calling this function on an active interface is a nop. On a failure
1003 * a negative errno code is returned.
1005 int dev_open(struct net_device *dev)
1015 if (dev->flags & IFF_UP)
1019 * Is it even present?
1021 if (!netif_device_present(dev))
1025 * Call device private open method
1027 set_bit(__LINK_STATE_START, &dev->state);
1029 if (dev->validate_addr)
1030 ret = dev->validate_addr(dev);
1032 if (!ret && dev->open)
1033 ret = dev->open(dev);
1036 * If it went open OK then:
1040 clear_bit(__LINK_STATE_START, &dev->state);
1045 dev->flags |= IFF_UP;
1048 * Initialize multicasting status
1050 dev_set_rx_mode(dev);
1053 * Wakeup transmit queue engine
1058 * ... and announce new interface.
1060 call_netdevice_notifiers(NETDEV_UP, dev);
1067 * dev_close - shutdown an interface.
1068 * @dev: device to shutdown
1070 * This function moves an active device into down state. A
1071 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1072 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1075 int dev_close(struct net_device *dev)
1081 if (!(dev->flags & IFF_UP))
1085 * Tell people we are going down, so that they can
1086 * prepare to death, when device is still operating.
1088 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1090 clear_bit(__LINK_STATE_START, &dev->state);
1092 /* Synchronize to scheduled poll. We cannot touch poll list,
1093 * it can be even on different cpu. So just clear netif_running().
1095 * dev->stop() will invoke napi_disable() on all of it's
1096 * napi_struct instances on this device.
1098 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1100 dev_deactivate(dev);
1103 * Call the device specific close. This cannot fail.
1104 * Only if device is UP
1106 * We allow it to be called even after a DETACH hot-plug
1113 * Device is now down.
1116 dev->flags &= ~IFF_UP;
1119 * Tell people we are down
1121 call_netdevice_notifiers(NETDEV_DOWN, dev);
1128 * dev_disable_lro - disable Large Receive Offload on a device
1131 * Disable Large Receive Offload (LRO) on a net device. Must be
1132 * called under RTNL. This is needed if received packets may be
1133 * forwarded to another interface.
1135 void dev_disable_lro(struct net_device *dev)
1137 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1138 dev->ethtool_ops->set_flags) {
1139 u32 flags = dev->ethtool_ops->get_flags(dev);
1140 if (flags & ETH_FLAG_LRO) {
1141 flags &= ~ETH_FLAG_LRO;
1142 dev->ethtool_ops->set_flags(dev, flags);
1145 WARN_ON(dev->features & NETIF_F_LRO);
1147 EXPORT_SYMBOL(dev_disable_lro);
1150 static int dev_boot_phase = 1;
1153 * Device change register/unregister. These are not inline or static
1154 * as we export them to the world.
1158 * register_netdevice_notifier - register a network notifier block
1161 * Register a notifier to be called when network device events occur.
1162 * The notifier passed is linked into the kernel structures and must
1163 * not be reused until it has been unregistered. A negative errno code
1164 * is returned on a failure.
1166 * When registered all registration and up events are replayed
1167 * to the new notifier to allow device to have a race free
1168 * view of the network device list.
1171 int register_netdevice_notifier(struct notifier_block *nb)
1173 struct net_device *dev;
1174 struct net_device *last;
1179 err = raw_notifier_chain_register(&netdev_chain, nb);
1185 for_each_netdev(net, dev) {
1186 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1187 err = notifier_to_errno(err);
1191 if (!(dev->flags & IFF_UP))
1194 nb->notifier_call(nb, NETDEV_UP, dev);
1205 for_each_netdev(net, dev) {
1209 if (dev->flags & IFF_UP) {
1210 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1211 nb->notifier_call(nb, NETDEV_DOWN, dev);
1213 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1217 raw_notifier_chain_unregister(&netdev_chain, nb);
1222 * unregister_netdevice_notifier - unregister a network notifier block
1225 * Unregister a notifier previously registered by
1226 * register_netdevice_notifier(). The notifier is unlinked into the
1227 * kernel structures and may then be reused. A negative errno code
1228 * is returned on a failure.
1231 int unregister_netdevice_notifier(struct notifier_block *nb)
1236 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1242 * call_netdevice_notifiers - call all network notifier blocks
1243 * @val: value passed unmodified to notifier function
1244 * @dev: net_device pointer passed unmodified to notifier function
1246 * Call all network notifier blocks. Parameters and return value
1247 * are as for raw_notifier_call_chain().
1250 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1252 return raw_notifier_call_chain(&netdev_chain, val, dev);
1255 /* When > 0 there are consumers of rx skb time stamps */
1256 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1258 void net_enable_timestamp(void)
1260 atomic_inc(&netstamp_needed);
1263 void net_disable_timestamp(void)
1265 atomic_dec(&netstamp_needed);
1268 static inline void net_timestamp(struct sk_buff *skb)
1270 if (atomic_read(&netstamp_needed))
1271 __net_timestamp(skb);
1273 skb->tstamp.tv64 = 0;
1277 * Support routine. Sends outgoing frames to any network
1278 * taps currently in use.
1281 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1283 struct packet_type *ptype;
1288 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1289 /* Never send packets back to the socket
1290 * they originated from - MvS (miquels@drinkel.ow.org)
1292 if ((ptype->dev == dev || !ptype->dev) &&
1293 (ptype->af_packet_priv == NULL ||
1294 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1295 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1299 /* skb->nh should be correctly
1300 set by sender, so that the second statement is
1301 just protection against buggy protocols.
1303 skb_reset_mac_header(skb2);
1305 if (skb_network_header(skb2) < skb2->data ||
1306 skb2->network_header > skb2->tail) {
1307 if (net_ratelimit())
1308 printk(KERN_CRIT "protocol %04x is "
1310 skb2->protocol, dev->name);
1311 skb_reset_network_header(skb2);
1314 skb2->transport_header = skb2->network_header;
1315 skb2->pkt_type = PACKET_OUTGOING;
1316 ptype->func(skb2, skb->dev, ptype, skb->dev);
1323 void __netif_schedule(struct net_device *dev)
1325 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
1326 unsigned long flags;
1327 struct softnet_data *sd;
1329 local_irq_save(flags);
1330 sd = &__get_cpu_var(softnet_data);
1331 dev->next_sched = sd->output_queue;
1332 sd->output_queue = dev;
1333 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1334 local_irq_restore(flags);
1337 EXPORT_SYMBOL(__netif_schedule);
1339 void dev_kfree_skb_irq(struct sk_buff *skb)
1341 if (atomic_dec_and_test(&skb->users)) {
1342 struct softnet_data *sd;
1343 unsigned long flags;
1345 local_irq_save(flags);
1346 sd = &__get_cpu_var(softnet_data);
1347 skb->next = sd->completion_queue;
1348 sd->completion_queue = skb;
1349 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1350 local_irq_restore(flags);
1353 EXPORT_SYMBOL(dev_kfree_skb_irq);
1355 void dev_kfree_skb_any(struct sk_buff *skb)
1357 if (in_irq() || irqs_disabled())
1358 dev_kfree_skb_irq(skb);
1362 EXPORT_SYMBOL(dev_kfree_skb_any);
1366 * netif_device_detach - mark device as removed
1367 * @dev: network device
1369 * Mark device as removed from system and therefore no longer available.
1371 void netif_device_detach(struct net_device *dev)
1373 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1374 netif_running(dev)) {
1375 netif_stop_queue(dev);
1378 EXPORT_SYMBOL(netif_device_detach);
1381 * netif_device_attach - mark device as attached
1382 * @dev: network device
1384 * Mark device as attached from system and restart if needed.
1386 void netif_device_attach(struct net_device *dev)
1388 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1389 netif_running(dev)) {
1390 netif_wake_queue(dev);
1391 __netdev_watchdog_up(dev);
1394 EXPORT_SYMBOL(netif_device_attach);
1396 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1398 return ((features & NETIF_F_GEN_CSUM) ||
1399 ((features & NETIF_F_IP_CSUM) &&
1400 protocol == htons(ETH_P_IP)) ||
1401 ((features & NETIF_F_IPV6_CSUM) &&
1402 protocol == htons(ETH_P_IPV6)));
1405 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1407 if (can_checksum_protocol(dev->features, skb->protocol))
1410 if (skb->protocol == htons(ETH_P_8021Q)) {
1411 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1412 if (can_checksum_protocol(dev->features & dev->vlan_features,
1413 veh->h_vlan_encapsulated_proto))
1421 * Invalidate hardware checksum when packet is to be mangled, and
1422 * complete checksum manually on outgoing path.
1424 int skb_checksum_help(struct sk_buff *skb)
1427 int ret = 0, offset;
1429 if (skb->ip_summed == CHECKSUM_COMPLETE)
1430 goto out_set_summed;
1432 if (unlikely(skb_shinfo(skb)->gso_size)) {
1433 /* Let GSO fix up the checksum. */
1434 goto out_set_summed;
1437 offset = skb->csum_start - skb_headroom(skb);
1438 BUG_ON(offset >= skb_headlen(skb));
1439 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1441 offset += skb->csum_offset;
1442 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1444 if (skb_cloned(skb) &&
1445 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1446 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1451 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1453 skb->ip_summed = CHECKSUM_NONE;
1459 * skb_gso_segment - Perform segmentation on skb.
1460 * @skb: buffer to segment
1461 * @features: features for the output path (see dev->features)
1463 * This function segments the given skb and returns a list of segments.
1465 * It may return NULL if the skb requires no segmentation. This is
1466 * only possible when GSO is used for verifying header integrity.
1468 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1470 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1471 struct packet_type *ptype;
1472 __be16 type = skb->protocol;
1475 BUG_ON(skb_shinfo(skb)->frag_list);
1477 skb_reset_mac_header(skb);
1478 skb->mac_len = skb->network_header - skb->mac_header;
1479 __skb_pull(skb, skb->mac_len);
1481 if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) {
1482 if (skb_header_cloned(skb) &&
1483 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1484 return ERR_PTR(err);
1488 list_for_each_entry_rcu(ptype,
1489 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1490 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1491 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1492 err = ptype->gso_send_check(skb);
1493 segs = ERR_PTR(err);
1494 if (err || skb_gso_ok(skb, features))
1496 __skb_push(skb, (skb->data -
1497 skb_network_header(skb)));
1499 segs = ptype->gso_segment(skb, features);
1505 __skb_push(skb, skb->data - skb_mac_header(skb));
1510 EXPORT_SYMBOL(skb_gso_segment);
1512 /* Take action when hardware reception checksum errors are detected. */
1514 void netdev_rx_csum_fault(struct net_device *dev)
1516 if (net_ratelimit()) {
1517 printk(KERN_ERR "%s: hw csum failure.\n",
1518 dev ? dev->name : "<unknown>");
1522 EXPORT_SYMBOL(netdev_rx_csum_fault);
1525 /* Actually, we should eliminate this check as soon as we know, that:
1526 * 1. IOMMU is present and allows to map all the memory.
1527 * 2. No high memory really exists on this machine.
1530 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1532 #ifdef CONFIG_HIGHMEM
1535 if (dev->features & NETIF_F_HIGHDMA)
1538 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1539 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1547 void (*destructor)(struct sk_buff *skb);
1550 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1552 static void dev_gso_skb_destructor(struct sk_buff *skb)
1554 struct dev_gso_cb *cb;
1557 struct sk_buff *nskb = skb->next;
1559 skb->next = nskb->next;
1562 } while (skb->next);
1564 cb = DEV_GSO_CB(skb);
1566 cb->destructor(skb);
1570 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1571 * @skb: buffer to segment
1573 * This function segments the given skb and stores the list of segments
1576 static int dev_gso_segment(struct sk_buff *skb)
1578 struct net_device *dev = skb->dev;
1579 struct sk_buff *segs;
1580 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1583 segs = skb_gso_segment(skb, features);
1585 /* Verifying header integrity only. */
1590 return PTR_ERR(segs);
1593 DEV_GSO_CB(skb)->destructor = skb->destructor;
1594 skb->destructor = dev_gso_skb_destructor;
1599 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
1601 if (likely(!skb->next)) {
1602 if (!list_empty(&ptype_all))
1603 dev_queue_xmit_nit(skb, dev);
1605 if (netif_needs_gso(dev, skb)) {
1606 if (unlikely(dev_gso_segment(skb)))
1612 return dev->hard_start_xmit(skb, dev);
1617 struct sk_buff *nskb = skb->next;
1620 skb->next = nskb->next;
1622 rc = dev->hard_start_xmit(nskb, dev);
1624 nskb->next = skb->next;
1628 if (unlikely((netif_queue_stopped(dev) ||
1629 netif_subqueue_stopped(dev, skb)) &&
1631 return NETDEV_TX_BUSY;
1632 } while (skb->next);
1634 skb->destructor = DEV_GSO_CB(skb)->destructor;
1642 * dev_queue_xmit - transmit a buffer
1643 * @skb: buffer to transmit
1645 * Queue a buffer for transmission to a network device. The caller must
1646 * have set the device and priority and built the buffer before calling
1647 * this function. The function can be called from an interrupt.
1649 * A negative errno code is returned on a failure. A success does not
1650 * guarantee the frame will be transmitted as it may be dropped due
1651 * to congestion or traffic shaping.
1653 * -----------------------------------------------------------------------------------
1654 * I notice this method can also return errors from the queue disciplines,
1655 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1658 * Regardless of the return value, the skb is consumed, so it is currently
1659 * difficult to retry a send to this method. (You can bump the ref count
1660 * before sending to hold a reference for retry if you are careful.)
1662 * When calling this method, interrupts MUST be enabled. This is because
1663 * the BH enable code must have IRQs enabled so that it will not deadlock.
1667 int dev_queue_xmit(struct sk_buff *skb)
1669 struct net_device *dev = skb->dev;
1673 /* GSO will handle the following emulations directly. */
1674 if (netif_needs_gso(dev, skb))
1677 if (skb_shinfo(skb)->frag_list &&
1678 !(dev->features & NETIF_F_FRAGLIST) &&
1679 __skb_linearize(skb))
1682 /* Fragmented skb is linearized if device does not support SG,
1683 * or if at least one of fragments is in highmem and device
1684 * does not support DMA from it.
1686 if (skb_shinfo(skb)->nr_frags &&
1687 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1688 __skb_linearize(skb))
1691 /* If packet is not checksummed and device does not support
1692 * checksumming for this protocol, complete checksumming here.
1694 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1695 skb_set_transport_header(skb, skb->csum_start -
1697 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
1702 spin_lock_prefetch(&dev->queue_lock);
1704 /* Disable soft irqs for various locks below. Also
1705 * stops preemption for RCU.
1709 /* Updates of qdisc are serialized by queue_lock.
1710 * The struct Qdisc which is pointed to by qdisc is now a
1711 * rcu structure - it may be accessed without acquiring
1712 * a lock (but the structure may be stale.) The freeing of the
1713 * qdisc will be deferred until it's known that there are no
1714 * more references to it.
1716 * If the qdisc has an enqueue function, we still need to
1717 * hold the queue_lock before calling it, since queue_lock
1718 * also serializes access to the device queue.
1721 q = rcu_dereference(dev->qdisc);
1722 #ifdef CONFIG_NET_CLS_ACT
1723 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1726 /* Grab device queue */
1727 spin_lock(&dev->queue_lock);
1730 /* reset queue_mapping to zero */
1731 skb_set_queue_mapping(skb, 0);
1732 rc = q->enqueue(skb, q);
1734 spin_unlock(&dev->queue_lock);
1736 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1739 spin_unlock(&dev->queue_lock);
1742 /* The device has no queue. Common case for software devices:
1743 loopback, all the sorts of tunnels...
1745 Really, it is unlikely that netif_tx_lock protection is necessary
1746 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1748 However, it is possible, that they rely on protection
1751 Check this and shot the lock. It is not prone from deadlocks.
1752 Either shot noqueue qdisc, it is even simpler 8)
1754 if (dev->flags & IFF_UP) {
1755 int cpu = smp_processor_id(); /* ok because BHs are off */
1757 if (dev->xmit_lock_owner != cpu) {
1759 HARD_TX_LOCK(dev, cpu);
1761 if (!netif_queue_stopped(dev) &&
1762 !netif_subqueue_stopped(dev, skb)) {
1764 if (!dev_hard_start_xmit(skb, dev)) {
1765 HARD_TX_UNLOCK(dev);
1769 HARD_TX_UNLOCK(dev);
1770 if (net_ratelimit())
1771 printk(KERN_CRIT "Virtual device %s asks to "
1772 "queue packet!\n", dev->name);
1774 /* Recursion is detected! It is possible,
1776 if (net_ratelimit())
1777 printk(KERN_CRIT "Dead loop on virtual device "
1778 "%s, fix it urgently!\n", dev->name);
1783 rcu_read_unlock_bh();
1789 rcu_read_unlock_bh();
1794 /*=======================================================================
1796 =======================================================================*/
1798 int netdev_max_backlog __read_mostly = 1000;
1799 int netdev_budget __read_mostly = 300;
1800 int weight_p __read_mostly = 64; /* old backlog weight */
1802 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1806 * netif_rx - post buffer to the network code
1807 * @skb: buffer to post
1809 * This function receives a packet from a device driver and queues it for
1810 * the upper (protocol) levels to process. It always succeeds. The buffer
1811 * may be dropped during processing for congestion control or by the
1815 * NET_RX_SUCCESS (no congestion)
1816 * NET_RX_DROP (packet was dropped)
1820 int netif_rx(struct sk_buff *skb)
1822 struct softnet_data *queue;
1823 unsigned long flags;
1825 /* if netpoll wants it, pretend we never saw it */
1826 if (netpoll_rx(skb))
1829 if (!skb->tstamp.tv64)
1833 * The code is rearranged so that the path is the most
1834 * short when CPU is congested, but is still operating.
1836 local_irq_save(flags);
1837 queue = &__get_cpu_var(softnet_data);
1839 __get_cpu_var(netdev_rx_stat).total++;
1840 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1841 if (queue->input_pkt_queue.qlen) {
1844 __skb_queue_tail(&queue->input_pkt_queue, skb);
1845 local_irq_restore(flags);
1846 return NET_RX_SUCCESS;
1849 napi_schedule(&queue->backlog);
1853 __get_cpu_var(netdev_rx_stat).dropped++;
1854 local_irq_restore(flags);
1860 int netif_rx_ni(struct sk_buff *skb)
1865 err = netif_rx(skb);
1866 if (local_softirq_pending())
1873 EXPORT_SYMBOL(netif_rx_ni);
1875 static inline struct net_device *skb_bond(struct sk_buff *skb)
1877 struct net_device *dev = skb->dev;
1880 if (skb_bond_should_drop(skb)) {
1884 skb->dev = dev->master;
1891 static void net_tx_action(struct softirq_action *h)
1893 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1895 if (sd->completion_queue) {
1896 struct sk_buff *clist;
1898 local_irq_disable();
1899 clist = sd->completion_queue;
1900 sd->completion_queue = NULL;
1904 struct sk_buff *skb = clist;
1905 clist = clist->next;
1907 BUG_TRAP(!atomic_read(&skb->users));
1912 if (sd->output_queue) {
1913 struct net_device *head;
1915 local_irq_disable();
1916 head = sd->output_queue;
1917 sd->output_queue = NULL;
1921 struct net_device *dev = head;
1922 head = head->next_sched;
1924 smp_mb__before_clear_bit();
1925 clear_bit(__LINK_STATE_SCHED, &dev->state);
1927 if (spin_trylock(&dev->queue_lock)) {
1929 spin_unlock(&dev->queue_lock);
1931 netif_schedule(dev);
1937 static inline int deliver_skb(struct sk_buff *skb,
1938 struct packet_type *pt_prev,
1939 struct net_device *orig_dev)
1941 atomic_inc(&skb->users);
1942 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1945 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1946 /* These hooks defined here for ATM */
1948 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1949 unsigned char *addr);
1950 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
1953 * If bridge module is loaded call bridging hook.
1954 * returns NULL if packet was consumed.
1956 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
1957 struct sk_buff *skb) __read_mostly;
1958 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
1959 struct packet_type **pt_prev, int *ret,
1960 struct net_device *orig_dev)
1962 struct net_bridge_port *port;
1964 if (skb->pkt_type == PACKET_LOOPBACK ||
1965 (port = rcu_dereference(skb->dev->br_port)) == NULL)
1969 *ret = deliver_skb(skb, *pt_prev, orig_dev);
1973 return br_handle_frame_hook(port, skb);
1976 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
1979 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
1980 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
1981 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
1983 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
1984 struct packet_type **pt_prev,
1986 struct net_device *orig_dev)
1988 if (skb->dev->macvlan_port == NULL)
1992 *ret = deliver_skb(skb, *pt_prev, orig_dev);
1995 return macvlan_handle_frame_hook(skb);
1998 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2001 #ifdef CONFIG_NET_CLS_ACT
2002 /* TODO: Maybe we should just force sch_ingress to be compiled in
2003 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2004 * a compare and 2 stores extra right now if we dont have it on
2005 * but have CONFIG_NET_CLS_ACT
2006 * NOTE: This doesnt stop any functionality; if you dont have
2007 * the ingress scheduler, you just cant add policies on ingress.
2010 static int ing_filter(struct sk_buff *skb)
2013 struct net_device *dev = skb->dev;
2014 int result = TC_ACT_OK;
2015 u32 ttl = G_TC_RTTL(skb->tc_verd);
2017 if (MAX_RED_LOOP < ttl++) {
2019 "Redir loop detected Dropping packet (%d->%d)\n",
2020 skb->iif, dev->ifindex);
2024 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2025 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2027 spin_lock(&dev->ingress_lock);
2028 if ((q = dev->qdisc_ingress) != NULL)
2029 result = q->enqueue(skb, q);
2030 spin_unlock(&dev->ingress_lock);
2035 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2036 struct packet_type **pt_prev,
2037 int *ret, struct net_device *orig_dev)
2039 if (!skb->dev->qdisc_ingress)
2043 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2046 /* Huh? Why does turning on AF_PACKET affect this? */
2047 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2050 switch (ing_filter(skb)) {
2064 * netif_receive_skb - process receive buffer from network
2065 * @skb: buffer to process
2067 * netif_receive_skb() is the main receive data processing function.
2068 * It always succeeds. The buffer may be dropped during processing
2069 * for congestion control or by the protocol layers.
2071 * This function may only be called from softirq context and interrupts
2072 * should be enabled.
2074 * Return values (usually ignored):
2075 * NET_RX_SUCCESS: no congestion
2076 * NET_RX_DROP: packet was dropped
2078 int netif_receive_skb(struct sk_buff *skb)
2080 struct packet_type *ptype, *pt_prev;
2081 struct net_device *orig_dev;
2082 int ret = NET_RX_DROP;
2085 /* if we've gotten here through NAPI, check netpoll */
2086 if (netpoll_receive_skb(skb))
2089 if (!skb->tstamp.tv64)
2093 skb->iif = skb->dev->ifindex;
2095 orig_dev = skb_bond(skb);
2100 __get_cpu_var(netdev_rx_stat).total++;
2102 skb_reset_network_header(skb);
2103 skb_reset_transport_header(skb);
2104 skb->mac_len = skb->network_header - skb->mac_header;
2110 /* Don't receive packets in an exiting network namespace */
2111 if (!net_alive(dev_net(skb->dev)))
2114 #ifdef CONFIG_NET_CLS_ACT
2115 if (skb->tc_verd & TC_NCLS) {
2116 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2121 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2122 if (!ptype->dev || ptype->dev == skb->dev) {
2124 ret = deliver_skb(skb, pt_prev, orig_dev);
2129 #ifdef CONFIG_NET_CLS_ACT
2130 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2136 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2139 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2143 type = skb->protocol;
2144 list_for_each_entry_rcu(ptype,
2145 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2146 if (ptype->type == type &&
2147 (!ptype->dev || ptype->dev == skb->dev)) {
2149 ret = deliver_skb(skb, pt_prev, orig_dev);
2155 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2158 /* Jamal, now you will not able to escape explaining
2159 * me how you were going to use this. :-)
2169 static int process_backlog(struct napi_struct *napi, int quota)
2172 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2173 unsigned long start_time = jiffies;
2175 napi->weight = weight_p;
2177 struct sk_buff *skb;
2178 struct net_device *dev;
2180 local_irq_disable();
2181 skb = __skb_dequeue(&queue->input_pkt_queue);
2183 __napi_complete(napi);
2192 netif_receive_skb(skb);
2195 } while (++work < quota && jiffies == start_time);
2201 * __napi_schedule - schedule for receive
2202 * @n: entry to schedule
2204 * The entry's receive function will be scheduled to run
2206 void __napi_schedule(struct napi_struct *n)
2208 unsigned long flags;
2210 local_irq_save(flags);
2211 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
2212 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2213 local_irq_restore(flags);
2215 EXPORT_SYMBOL(__napi_schedule);
2218 static void net_rx_action(struct softirq_action *h)
2220 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
2221 unsigned long start_time = jiffies;
2222 int budget = netdev_budget;
2225 local_irq_disable();
2227 while (!list_empty(list)) {
2228 struct napi_struct *n;
2231 /* If softirq window is exhuasted then punt.
2233 * Note that this is a slight policy change from the
2234 * previous NAPI code, which would allow up to 2
2235 * jiffies to pass before breaking out. The test
2236 * used to be "jiffies - start_time > 1".
2238 if (unlikely(budget <= 0 || jiffies != start_time))
2243 /* Even though interrupts have been re-enabled, this
2244 * access is safe because interrupts can only add new
2245 * entries to the tail of this list, and only ->poll()
2246 * calls can remove this head entry from the list.
2248 n = list_entry(list->next, struct napi_struct, poll_list);
2250 have = netpoll_poll_lock(n);
2254 /* This NAPI_STATE_SCHED test is for avoiding a race
2255 * with netpoll's poll_napi(). Only the entity which
2256 * obtains the lock and sees NAPI_STATE_SCHED set will
2257 * actually make the ->poll() call. Therefore we avoid
2258 * accidently calling ->poll() when NAPI is not scheduled.
2261 if (test_bit(NAPI_STATE_SCHED, &n->state))
2262 work = n->poll(n, weight);
2264 WARN_ON_ONCE(work > weight);
2268 local_irq_disable();
2270 /* Drivers must not modify the NAPI state if they
2271 * consume the entire weight. In such cases this code
2272 * still "owns" the NAPI instance and therefore can
2273 * move the instance around on the list at-will.
2275 if (unlikely(work == weight)) {
2276 if (unlikely(napi_disable_pending(n)))
2279 list_move_tail(&n->poll_list, list);
2282 netpoll_poll_unlock(have);
2287 #ifdef CONFIG_NET_DMA
2289 * There may not be any more sk_buffs coming right now, so push
2290 * any pending DMA copies to hardware
2292 if (!cpus_empty(net_dma.channel_mask)) {
2294 for_each_cpu_mask(chan_idx, net_dma.channel_mask) {
2295 struct dma_chan *chan = net_dma.channels[chan_idx];
2297 dma_async_memcpy_issue_pending(chan);
2305 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2306 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2310 static gifconf_func_t * gifconf_list [NPROTO];
2313 * register_gifconf - register a SIOCGIF handler
2314 * @family: Address family
2315 * @gifconf: Function handler
2317 * Register protocol dependent address dumping routines. The handler
2318 * that is passed must not be freed or reused until it has been replaced
2319 * by another handler.
2321 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
2323 if (family >= NPROTO)
2325 gifconf_list[family] = gifconf;
2331 * Map an interface index to its name (SIOCGIFNAME)
2335 * We need this ioctl for efficient implementation of the
2336 * if_indextoname() function required by the IPv6 API. Without
2337 * it, we would have to search all the interfaces to find a
2341 static int dev_ifname(struct net *net, struct ifreq __user *arg)
2343 struct net_device *dev;
2347 * Fetch the caller's info block.
2350 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2353 read_lock(&dev_base_lock);
2354 dev = __dev_get_by_index(net, ifr.ifr_ifindex);
2356 read_unlock(&dev_base_lock);
2360 strcpy(ifr.ifr_name, dev->name);
2361 read_unlock(&dev_base_lock);
2363 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2369 * Perform a SIOCGIFCONF call. This structure will change
2370 * size eventually, and there is nothing I can do about it.
2371 * Thus we will need a 'compatibility mode'.
2374 static int dev_ifconf(struct net *net, char __user *arg)
2377 struct net_device *dev;
2384 * Fetch the caller's info block.
2387 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2394 * Loop over the interfaces, and write an info block for each.
2398 for_each_netdev(net, dev) {
2399 for (i = 0; i < NPROTO; i++) {
2400 if (gifconf_list[i]) {
2403 done = gifconf_list[i](dev, NULL, 0);
2405 done = gifconf_list[i](dev, pos + total,
2415 * All done. Write the updated control block back to the caller.
2417 ifc.ifc_len = total;
2420 * Both BSD and Solaris return 0 here, so we do too.
2422 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2425 #ifdef CONFIG_PROC_FS
2427 * This is invoked by the /proc filesystem handler to display a device
2430 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2431 __acquires(dev_base_lock)
2433 struct net *net = seq_file_net(seq);
2435 struct net_device *dev;
2437 read_lock(&dev_base_lock);
2439 return SEQ_START_TOKEN;
2442 for_each_netdev(net, dev)
2449 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2451 struct net *net = seq_file_net(seq);
2453 return v == SEQ_START_TOKEN ?
2454 first_net_device(net) : next_net_device((struct net_device *)v);
2457 void dev_seq_stop(struct seq_file *seq, void *v)
2458 __releases(dev_base_lock)
2460 read_unlock(&dev_base_lock);
2463 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2465 struct net_device_stats *stats = dev->get_stats(dev);
2467 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2468 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2469 dev->name, stats->rx_bytes, stats->rx_packets,
2471 stats->rx_dropped + stats->rx_missed_errors,
2472 stats->rx_fifo_errors,
2473 stats->rx_length_errors + stats->rx_over_errors +
2474 stats->rx_crc_errors + stats->rx_frame_errors,
2475 stats->rx_compressed, stats->multicast,
2476 stats->tx_bytes, stats->tx_packets,
2477 stats->tx_errors, stats->tx_dropped,
2478 stats->tx_fifo_errors, stats->collisions,
2479 stats->tx_carrier_errors +
2480 stats->tx_aborted_errors +
2481 stats->tx_window_errors +
2482 stats->tx_heartbeat_errors,
2483 stats->tx_compressed);
2487 * Called from the PROCfs module. This now uses the new arbitrary sized
2488 * /proc/net interface to create /proc/net/dev
2490 static int dev_seq_show(struct seq_file *seq, void *v)
2492 if (v == SEQ_START_TOKEN)
2493 seq_puts(seq, "Inter-| Receive "
2495 " face |bytes packets errs drop fifo frame "
2496 "compressed multicast|bytes packets errs "
2497 "drop fifo colls carrier compressed\n");
2499 dev_seq_printf_stats(seq, v);
2503 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2505 struct netif_rx_stats *rc = NULL;
2507 while (*pos < nr_cpu_ids)
2508 if (cpu_online(*pos)) {
2509 rc = &per_cpu(netdev_rx_stat, *pos);
2516 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2518 return softnet_get_online(pos);
2521 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2524 return softnet_get_online(pos);
2527 static void softnet_seq_stop(struct seq_file *seq, void *v)
2531 static int softnet_seq_show(struct seq_file *seq, void *v)
2533 struct netif_rx_stats *s = v;
2535 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2536 s->total, s->dropped, s->time_squeeze, 0,
2537 0, 0, 0, 0, /* was fastroute */
2542 static const struct seq_operations dev_seq_ops = {
2543 .start = dev_seq_start,
2544 .next = dev_seq_next,
2545 .stop = dev_seq_stop,
2546 .show = dev_seq_show,
2549 static int dev_seq_open(struct inode *inode, struct file *file)
2551 return seq_open_net(inode, file, &dev_seq_ops,
2552 sizeof(struct seq_net_private));
2555 static const struct file_operations dev_seq_fops = {
2556 .owner = THIS_MODULE,
2557 .open = dev_seq_open,
2559 .llseek = seq_lseek,
2560 .release = seq_release_net,
2563 static const struct seq_operations softnet_seq_ops = {
2564 .start = softnet_seq_start,
2565 .next = softnet_seq_next,
2566 .stop = softnet_seq_stop,
2567 .show = softnet_seq_show,
2570 static int softnet_seq_open(struct inode *inode, struct file *file)
2572 return seq_open(file, &softnet_seq_ops);
2575 static const struct file_operations softnet_seq_fops = {
2576 .owner = THIS_MODULE,
2577 .open = softnet_seq_open,
2579 .llseek = seq_lseek,
2580 .release = seq_release,
2583 static void *ptype_get_idx(loff_t pos)
2585 struct packet_type *pt = NULL;
2589 list_for_each_entry_rcu(pt, &ptype_all, list) {
2595 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
2596 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
2605 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
2609 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
2612 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2614 struct packet_type *pt;
2615 struct list_head *nxt;
2619 if (v == SEQ_START_TOKEN)
2620 return ptype_get_idx(0);
2623 nxt = pt->list.next;
2624 if (pt->type == htons(ETH_P_ALL)) {
2625 if (nxt != &ptype_all)
2628 nxt = ptype_base[0].next;
2630 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
2632 while (nxt == &ptype_base[hash]) {
2633 if (++hash >= PTYPE_HASH_SIZE)
2635 nxt = ptype_base[hash].next;
2638 return list_entry(nxt, struct packet_type, list);
2641 static void ptype_seq_stop(struct seq_file *seq, void *v)
2647 static void ptype_seq_decode(struct seq_file *seq, void *sym)
2649 #ifdef CONFIG_KALLSYMS
2650 unsigned long offset = 0, symsize;
2651 const char *symname;
2655 symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset,
2662 modname = delim = "";
2663 seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim,
2669 seq_printf(seq, "[%p]", sym);
2672 static int ptype_seq_show(struct seq_file *seq, void *v)
2674 struct packet_type *pt = v;
2676 if (v == SEQ_START_TOKEN)
2677 seq_puts(seq, "Type Device Function\n");
2678 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
2679 if (pt->type == htons(ETH_P_ALL))
2680 seq_puts(seq, "ALL ");
2682 seq_printf(seq, "%04x", ntohs(pt->type));
2684 seq_printf(seq, " %-8s ",
2685 pt->dev ? pt->dev->name : "");
2686 ptype_seq_decode(seq, pt->func);
2687 seq_putc(seq, '\n');
2693 static const struct seq_operations ptype_seq_ops = {
2694 .start = ptype_seq_start,
2695 .next = ptype_seq_next,
2696 .stop = ptype_seq_stop,
2697 .show = ptype_seq_show,
2700 static int ptype_seq_open(struct inode *inode, struct file *file)
2702 return seq_open_net(inode, file, &ptype_seq_ops,
2703 sizeof(struct seq_net_private));
2706 static const struct file_operations ptype_seq_fops = {
2707 .owner = THIS_MODULE,
2708 .open = ptype_seq_open,
2710 .llseek = seq_lseek,
2711 .release = seq_release_net,
2715 static int __net_init dev_proc_net_init(struct net *net)
2719 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
2721 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
2723 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
2726 if (wext_proc_init(net))
2732 proc_net_remove(net, "ptype");
2734 proc_net_remove(net, "softnet_stat");
2736 proc_net_remove(net, "dev");
2740 static void __net_exit dev_proc_net_exit(struct net *net)
2742 wext_proc_exit(net);
2744 proc_net_remove(net, "ptype");
2745 proc_net_remove(net, "softnet_stat");
2746 proc_net_remove(net, "dev");
2749 static struct pernet_operations __net_initdata dev_proc_ops = {
2750 .init = dev_proc_net_init,
2751 .exit = dev_proc_net_exit,
2754 static int __init dev_proc_init(void)
2756 return register_pernet_subsys(&dev_proc_ops);
2759 #define dev_proc_init() 0
2760 #endif /* CONFIG_PROC_FS */
2764 * netdev_set_master - set up master/slave pair
2765 * @slave: slave device
2766 * @master: new master device
2768 * Changes the master device of the slave. Pass %NULL to break the
2769 * bonding. The caller must hold the RTNL semaphore. On a failure
2770 * a negative errno code is returned. On success the reference counts
2771 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2772 * function returns zero.
2774 int netdev_set_master(struct net_device *slave, struct net_device *master)
2776 struct net_device *old = slave->master;
2786 slave->master = master;
2794 slave->flags |= IFF_SLAVE;
2796 slave->flags &= ~IFF_SLAVE;
2798 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2802 static int __dev_set_promiscuity(struct net_device *dev, int inc)
2804 unsigned short old_flags = dev->flags;
2808 dev->flags |= IFF_PROMISC;
2809 dev->promiscuity += inc;
2810 if (dev->promiscuity == 0) {
2813 * If inc causes overflow, untouch promisc and return error.
2816 dev->flags &= ~IFF_PROMISC;
2818 dev->promiscuity -= inc;
2819 printk(KERN_WARNING "%s: promiscuity touches roof, "
2820 "set promiscuity failed, promiscuity feature "
2821 "of device might be broken.\n", dev->name);
2825 if (dev->flags != old_flags) {
2826 printk(KERN_INFO "device %s %s promiscuous mode\n",
2827 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2830 audit_log(current->audit_context, GFP_ATOMIC,
2831 AUDIT_ANOM_PROMISCUOUS,
2832 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
2833 dev->name, (dev->flags & IFF_PROMISC),
2834 (old_flags & IFF_PROMISC),
2835 audit_get_loginuid(current),
2836 current->uid, current->gid,
2837 audit_get_sessionid(current));
2839 if (dev->change_rx_flags)
2840 dev->change_rx_flags(dev, IFF_PROMISC);
2846 * dev_set_promiscuity - update promiscuity count on a device
2850 * Add or remove promiscuity from a device. While the count in the device
2851 * remains above zero the interface remains promiscuous. Once it hits zero
2852 * the device reverts back to normal filtering operation. A negative inc
2853 * value is used to drop promiscuity on the device.
2854 * Return 0 if successful or a negative errno code on error.
2856 int dev_set_promiscuity(struct net_device *dev, int inc)
2858 unsigned short old_flags = dev->flags;
2861 err = __dev_set_promiscuity(dev, inc);
2864 if (dev->flags != old_flags)
2865 dev_set_rx_mode(dev);
2870 * dev_set_allmulti - update allmulti count on a device
2874 * Add or remove reception of all multicast frames to a device. While the
2875 * count in the device remains above zero the interface remains listening
2876 * to all interfaces. Once it hits zero the device reverts back to normal
2877 * filtering operation. A negative @inc value is used to drop the counter
2878 * when releasing a resource needing all multicasts.
2879 * Return 0 if successful or a negative errno code on error.
2882 int dev_set_allmulti(struct net_device *dev, int inc)
2884 unsigned short old_flags = dev->flags;
2888 dev->flags |= IFF_ALLMULTI;
2889 dev->allmulti += inc;
2890 if (dev->allmulti == 0) {
2893 * If inc causes overflow, untouch allmulti and return error.
2896 dev->flags &= ~IFF_ALLMULTI;
2898 dev->allmulti -= inc;
2899 printk(KERN_WARNING "%s: allmulti touches roof, "
2900 "set allmulti failed, allmulti feature of "
2901 "device might be broken.\n", dev->name);
2905 if (dev->flags ^ old_flags) {
2906 if (dev->change_rx_flags)
2907 dev->change_rx_flags(dev, IFF_ALLMULTI);
2908 dev_set_rx_mode(dev);
2914 * Upload unicast and multicast address lists to device and
2915 * configure RX filtering. When the device doesn't support unicast
2916 * filtering it is put in promiscuous mode while unicast addresses
2919 void __dev_set_rx_mode(struct net_device *dev)
2921 /* dev_open will call this function so the list will stay sane. */
2922 if (!(dev->flags&IFF_UP))
2925 if (!netif_device_present(dev))
2928 if (dev->set_rx_mode)
2929 dev->set_rx_mode(dev);
2931 /* Unicast addresses changes may only happen under the rtnl,
2932 * therefore calling __dev_set_promiscuity here is safe.
2934 if (dev->uc_count > 0 && !dev->uc_promisc) {
2935 __dev_set_promiscuity(dev, 1);
2936 dev->uc_promisc = 1;
2937 } else if (dev->uc_count == 0 && dev->uc_promisc) {
2938 __dev_set_promiscuity(dev, -1);
2939 dev->uc_promisc = 0;
2942 if (dev->set_multicast_list)
2943 dev->set_multicast_list(dev);
2947 void dev_set_rx_mode(struct net_device *dev)
2949 netif_tx_lock_bh(dev);
2950 __dev_set_rx_mode(dev);
2951 netif_tx_unlock_bh(dev);
2954 int __dev_addr_delete(struct dev_addr_list **list, int *count,
2955 void *addr, int alen, int glbl)
2957 struct dev_addr_list *da;
2959 for (; (da = *list) != NULL; list = &da->next) {
2960 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
2961 alen == da->da_addrlen) {
2963 int old_glbl = da->da_gusers;
2980 int __dev_addr_add(struct dev_addr_list **list, int *count,
2981 void *addr, int alen, int glbl)
2983 struct dev_addr_list *da;
2985 for (da = *list; da != NULL; da = da->next) {
2986 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
2987 da->da_addrlen == alen) {
2989 int old_glbl = da->da_gusers;
2999 da = kzalloc(sizeof(*da), GFP_ATOMIC);
3002 memcpy(da->da_addr, addr, alen);
3003 da->da_addrlen = alen;
3005 da->da_gusers = glbl ? 1 : 0;
3013 * dev_unicast_delete - Release secondary unicast address.
3015 * @addr: address to delete
3016 * @alen: length of @addr
3018 * Release reference to a secondary unicast address and remove it
3019 * from the device if the reference count drops to zero.
3021 * The caller must hold the rtnl_mutex.
3023 int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
3029 netif_tx_lock_bh(dev);
3030 err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3032 __dev_set_rx_mode(dev);
3033 netif_tx_unlock_bh(dev);
3036 EXPORT_SYMBOL(dev_unicast_delete);
3039 * dev_unicast_add - add a secondary unicast address
3041 * @addr: address to add
3042 * @alen: length of @addr
3044 * Add a secondary unicast address to the device or increase
3045 * the reference count if it already exists.
3047 * The caller must hold the rtnl_mutex.
3049 int dev_unicast_add(struct net_device *dev, void *addr, int alen)
3055 netif_tx_lock_bh(dev);
3056 err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3058 __dev_set_rx_mode(dev);
3059 netif_tx_unlock_bh(dev);
3062 EXPORT_SYMBOL(dev_unicast_add);
3064 int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
3065 struct dev_addr_list **from, int *from_count)
3067 struct dev_addr_list *da, *next;
3071 while (da != NULL) {
3073 if (!da->da_synced) {
3074 err = __dev_addr_add(to, to_count,
3075 da->da_addr, da->da_addrlen, 0);
3080 } else if (da->da_users == 1) {
3081 __dev_addr_delete(to, to_count,
3082 da->da_addr, da->da_addrlen, 0);
3083 __dev_addr_delete(from, from_count,
3084 da->da_addr, da->da_addrlen, 0);
3091 void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
3092 struct dev_addr_list **from, int *from_count)
3094 struct dev_addr_list *da, *next;
3097 while (da != NULL) {
3099 if (da->da_synced) {
3100 __dev_addr_delete(to, to_count,
3101 da->da_addr, da->da_addrlen, 0);
3103 __dev_addr_delete(from, from_count,
3104 da->da_addr, da->da_addrlen, 0);
3111 * dev_unicast_sync - Synchronize device's unicast list to another device
3112 * @to: destination device
3113 * @from: source device
3115 * Add newly added addresses to the destination device and release
3116 * addresses that have no users left. The source device must be
3117 * locked by netif_tx_lock_bh.
3119 * This function is intended to be called from the dev->set_rx_mode
3120 * function of layered software devices.
3122 int dev_unicast_sync(struct net_device *to, struct net_device *from)
3126 netif_tx_lock_bh(to);
3127 err = __dev_addr_sync(&to->uc_list, &to->uc_count,
3128 &from->uc_list, &from->uc_count);
3130 __dev_set_rx_mode(to);
3131 netif_tx_unlock_bh(to);
3134 EXPORT_SYMBOL(dev_unicast_sync);
3137 * dev_unicast_unsync - Remove synchronized addresses from the destination device
3138 * @to: destination device
3139 * @from: source device
3141 * Remove all addresses that were added to the destination device by
3142 * dev_unicast_sync(). This function is intended to be called from the
3143 * dev->stop function of layered software devices.
3145 void dev_unicast_unsync(struct net_device *to, struct net_device *from)
3147 netif_tx_lock_bh(from);
3148 netif_tx_lock_bh(to);
3150 __dev_addr_unsync(&to->uc_list, &to->uc_count,
3151 &from->uc_list, &from->uc_count);
3152 __dev_set_rx_mode(to);
3154 netif_tx_unlock_bh(to);
3155 netif_tx_unlock_bh(from);
3157 EXPORT_SYMBOL(dev_unicast_unsync);
3159 static void __dev_addr_discard(struct dev_addr_list **list)
3161 struct dev_addr_list *tmp;
3163 while (*list != NULL) {
3166 if (tmp->da_users > tmp->da_gusers)
3167 printk("__dev_addr_discard: address leakage! "
3168 "da_users=%d\n", tmp->da_users);
3173 static void dev_addr_discard(struct net_device *dev)
3175 netif_tx_lock_bh(dev);
3177 __dev_addr_discard(&dev->uc_list);
3180 __dev_addr_discard(&dev->mc_list);
3183 netif_tx_unlock_bh(dev);
3186 unsigned dev_get_flags(const struct net_device *dev)
3190 flags = (dev->flags & ~(IFF_PROMISC |
3195 (dev->gflags & (IFF_PROMISC |
3198 if (netif_running(dev)) {
3199 if (netif_oper_up(dev))
3200 flags |= IFF_RUNNING;
3201 if (netif_carrier_ok(dev))
3202 flags |= IFF_LOWER_UP;
3203 if (netif_dormant(dev))
3204 flags |= IFF_DORMANT;
3210 int dev_change_flags(struct net_device *dev, unsigned flags)
3213 int old_flags = dev->flags;
3218 * Set the flags on our device.
3221 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
3222 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
3224 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
3228 * Load in the correct multicast list now the flags have changed.
3231 if (dev->change_rx_flags && (old_flags ^ flags) & IFF_MULTICAST)
3232 dev->change_rx_flags(dev, IFF_MULTICAST);
3234 dev_set_rx_mode(dev);
3237 * Have we downed the interface. We handle IFF_UP ourselves
3238 * according to user attempts to set it, rather than blindly
3243 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
3244 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
3247 dev_set_rx_mode(dev);
3250 if (dev->flags & IFF_UP &&
3251 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
3253 call_netdevice_notifiers(NETDEV_CHANGE, dev);
3255 if ((flags ^ dev->gflags) & IFF_PROMISC) {
3256 int inc = (flags & IFF_PROMISC) ? +1 : -1;
3257 dev->gflags ^= IFF_PROMISC;
3258 dev_set_promiscuity(dev, inc);
3261 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
3262 is important. Some (broken) drivers set IFF_PROMISC, when
3263 IFF_ALLMULTI is requested not asking us and not reporting.
3265 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
3266 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
3267 dev->gflags ^= IFF_ALLMULTI;
3268 dev_set_allmulti(dev, inc);
3271 /* Exclude state transition flags, already notified */
3272 changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
3274 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
3279 int dev_set_mtu(struct net_device *dev, int new_mtu)
3283 if (new_mtu == dev->mtu)
3286 /* MTU must be positive. */
3290 if (!netif_device_present(dev))
3294 if (dev->change_mtu)
3295 err = dev->change_mtu(dev, new_mtu);
3298 if (!err && dev->flags & IFF_UP)
3299 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
3303 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
3307 if (!dev->set_mac_address)
3309 if (sa->sa_family != dev->type)
3311 if (!netif_device_present(dev))
3313 err = dev->set_mac_address(dev, sa);
3315 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3320 * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
3322 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
3325 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3331 case SIOCGIFFLAGS: /* Get interface flags */
3332 ifr->ifr_flags = dev_get_flags(dev);
3335 case SIOCGIFMETRIC: /* Get the metric on the interface
3336 (currently unused) */
3337 ifr->ifr_metric = 0;
3340 case SIOCGIFMTU: /* Get the MTU of a device */
3341 ifr->ifr_mtu = dev->mtu;
3346 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
3348 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
3349 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3350 ifr->ifr_hwaddr.sa_family = dev->type;
3358 ifr->ifr_map.mem_start = dev->mem_start;
3359 ifr->ifr_map.mem_end = dev->mem_end;
3360 ifr->ifr_map.base_addr = dev->base_addr;
3361 ifr->ifr_map.irq = dev->irq;
3362 ifr->ifr_map.dma = dev->dma;
3363 ifr->ifr_map.port = dev->if_port;
3367 ifr->ifr_ifindex = dev->ifindex;
3371 ifr->ifr_qlen = dev->tx_queue_len;
3375 /* dev_ioctl() should ensure this case
3387 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
3389 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
3392 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3398 case SIOCSIFFLAGS: /* Set interface flags */
3399 return dev_change_flags(dev, ifr->ifr_flags);
3401 case SIOCSIFMETRIC: /* Set the metric on the interface
3402 (currently unused) */
3405 case SIOCSIFMTU: /* Set the MTU of a device */
3406 return dev_set_mtu(dev, ifr->ifr_mtu);
3409 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
3411 case SIOCSIFHWBROADCAST:
3412 if (ifr->ifr_hwaddr.sa_family != dev->type)
3414 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
3415 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3416 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3420 if (dev->set_config) {
3421 if (!netif_device_present(dev))
3423 return dev->set_config(dev, &ifr->ifr_map);
3428 if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
3429 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3431 if (!netif_device_present(dev))
3433 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
3437 if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
3438 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3440 if (!netif_device_present(dev))
3442 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
3446 if (ifr->ifr_qlen < 0)
3448 dev->tx_queue_len = ifr->ifr_qlen;
3452 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
3453 return dev_change_name(dev, ifr->ifr_newname);
3456 * Unknown or private ioctl
3460 if ((cmd >= SIOCDEVPRIVATE &&
3461 cmd <= SIOCDEVPRIVATE + 15) ||
3462 cmd == SIOCBONDENSLAVE ||
3463 cmd == SIOCBONDRELEASE ||
3464 cmd == SIOCBONDSETHWADDR ||
3465 cmd == SIOCBONDSLAVEINFOQUERY ||
3466 cmd == SIOCBONDINFOQUERY ||
3467 cmd == SIOCBONDCHANGEACTIVE ||
3468 cmd == SIOCGMIIPHY ||
3469 cmd == SIOCGMIIREG ||
3470 cmd == SIOCSMIIREG ||
3471 cmd == SIOCBRADDIF ||
3472 cmd == SIOCBRDELIF ||
3473 cmd == SIOCWANDEV) {
3475 if (dev->do_ioctl) {
3476 if (netif_device_present(dev))
3477 err = dev->do_ioctl(dev, ifr,
3490 * This function handles all "interface"-type I/O control requests. The actual
3491 * 'doing' part of this is dev_ifsioc above.
3495 * dev_ioctl - network device ioctl
3496 * @net: the applicable net namespace
3497 * @cmd: command to issue
3498 * @arg: pointer to a struct ifreq in user space
3500 * Issue ioctl functions to devices. This is normally called by the
3501 * user space syscall interfaces but can sometimes be useful for
3502 * other purposes. The return value is the return from the syscall if
3503 * positive or a negative errno code on error.
3506 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
3512 /* One special case: SIOCGIFCONF takes ifconf argument
3513 and requires shared lock, because it sleeps writing
3517 if (cmd == SIOCGIFCONF) {
3519 ret = dev_ifconf(net, (char __user *) arg);
3523 if (cmd == SIOCGIFNAME)
3524 return dev_ifname(net, (struct ifreq __user *)arg);
3526 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3529 ifr.ifr_name[IFNAMSIZ-1] = 0;
3531 colon = strchr(ifr.ifr_name, ':');
3536 * See which interface the caller is talking about.
3541 * These ioctl calls:
3542 * - can be done by all.
3543 * - atomic and do not require locking.
3554 dev_load(net, ifr.ifr_name);
3555 read_lock(&dev_base_lock);
3556 ret = dev_ifsioc_locked(net, &ifr, cmd);
3557 read_unlock(&dev_base_lock);
3561 if (copy_to_user(arg, &ifr,
3562 sizeof(struct ifreq)))
3568 dev_load(net, ifr.ifr_name);
3570 ret = dev_ethtool(net, &ifr);
3575 if (copy_to_user(arg, &ifr,
3576 sizeof(struct ifreq)))
3582 * These ioctl calls:
3583 * - require superuser power.
3584 * - require strict serialization.
3590 if (!capable(CAP_NET_ADMIN))
3592 dev_load(net, ifr.ifr_name);
3594 ret = dev_ifsioc(net, &ifr, cmd);
3599 if (copy_to_user(arg, &ifr,
3600 sizeof(struct ifreq)))
3606 * These ioctl calls:
3607 * - require superuser power.
3608 * - require strict serialization.
3609 * - do not return a value
3619 case SIOCSIFHWBROADCAST:
3622 case SIOCBONDENSLAVE:
3623 case SIOCBONDRELEASE:
3624 case SIOCBONDSETHWADDR:
3625 case SIOCBONDCHANGEACTIVE:
3628 if (!capable(CAP_NET_ADMIN))
3631 case SIOCBONDSLAVEINFOQUERY:
3632 case SIOCBONDINFOQUERY:
3633 dev_load(net, ifr.ifr_name);
3635 ret = dev_ifsioc(net, &ifr, cmd);
3640 /* Get the per device memory space. We can add this but
3641 * currently do not support it */
3643 /* Set the per device memory buffer space.
3644 * Not applicable in our case */
3649 * Unknown or private ioctl.
3652 if (cmd == SIOCWANDEV ||
3653 (cmd >= SIOCDEVPRIVATE &&
3654 cmd <= SIOCDEVPRIVATE + 15)) {
3655 dev_load(net, ifr.ifr_name);
3657 ret = dev_ifsioc(net, &ifr, cmd);
3659 if (!ret && copy_to_user(arg, &ifr,
3660 sizeof(struct ifreq)))
3664 /* Take care of Wireless Extensions */
3665 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
3666 return wext_handle_ioctl(net, &ifr, cmd, arg);
3673 * dev_new_index - allocate an ifindex
3674 * @net: the applicable net namespace
3676 * Returns a suitable unique value for a new device interface
3677 * number. The caller must hold the rtnl semaphore or the
3678 * dev_base_lock to be sure it remains unique.
3680 static int dev_new_index(struct net *net)
3686 if (!__dev_get_by_index(net, ifindex))
3691 /* Delayed registration/unregisteration */
3692 static DEFINE_SPINLOCK(net_todo_list_lock);
3693 static LIST_HEAD(net_todo_list);
3695 static void net_set_todo(struct net_device *dev)
3697 spin_lock(&net_todo_list_lock);
3698 list_add_tail(&dev->todo_list, &net_todo_list);
3699 spin_unlock(&net_todo_list_lock);
3702 static void rollback_registered(struct net_device *dev)
3704 BUG_ON(dev_boot_phase);
3707 /* Some devices call without registering for initialization unwind. */
3708 if (dev->reg_state == NETREG_UNINITIALIZED) {
3709 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3710 "was registered\n", dev->name, dev);
3716 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3718 /* If device is running, close it first. */
3721 /* And unlink it from device chain. */
3722 unlist_netdevice(dev);
3724 dev->reg_state = NETREG_UNREGISTERING;
3728 /* Shutdown queueing discipline. */
3732 /* Notify protocols, that we are about to destroy
3733 this device. They should clean all the things.
3735 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
3738 * Flush the unicast and multicast chains
3740 dev_addr_discard(dev);
3745 /* Notifier chain MUST detach us from master device. */
3746 BUG_TRAP(!dev->master);
3748 /* Remove entries from kobject tree */
3749 netdev_unregister_kobject(dev);
3757 * register_netdevice - register a network device
3758 * @dev: device to register
3760 * Take a completed network device structure and add it to the kernel
3761 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3762 * chain. 0 is returned on success. A negative errno code is returned
3763 * on a failure to set up the device, or if the name is a duplicate.
3765 * Callers must hold the rtnl semaphore. You may want
3766 * register_netdev() instead of this.
3769 * The locking appears insufficient to guarantee two parallel registers
3770 * will not get the same name.
3773 int register_netdevice(struct net_device *dev)
3775 struct hlist_head *head;
3776 struct hlist_node *p;
3780 BUG_ON(dev_boot_phase);
3785 /* When net_device's are persistent, this will be fatal. */
3786 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
3787 BUG_ON(!dev_net(dev));
3790 spin_lock_init(&dev->queue_lock);
3791 spin_lock_init(&dev->_xmit_lock);
3792 netdev_set_lockdep_class(&dev->_xmit_lock, dev->type);
3793 dev->xmit_lock_owner = -1;
3794 spin_lock_init(&dev->ingress_lock);
3798 /* Init, if this function is available */
3800 ret = dev->init(dev);
3808 if (!dev_valid_name(dev->name)) {
3813 dev->ifindex = dev_new_index(net);
3814 if (dev->iflink == -1)
3815 dev->iflink = dev->ifindex;
3817 /* Check for existence of name */
3818 head = dev_name_hash(net, dev->name);
3819 hlist_for_each(p, head) {
3820 struct net_device *d
3821 = hlist_entry(p, struct net_device, name_hlist);
3822 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
3828 /* Fix illegal checksum combinations */
3829 if ((dev->features & NETIF_F_HW_CSUM) &&
3830 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3831 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
3833 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
3836 if ((dev->features & NETIF_F_NO_CSUM) &&
3837 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3838 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
3840 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
3844 /* Fix illegal SG+CSUM combinations. */
3845 if ((dev->features & NETIF_F_SG) &&
3846 !(dev->features & NETIF_F_ALL_CSUM)) {
3847 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
3849 dev->features &= ~NETIF_F_SG;
3852 /* TSO requires that SG is present as well. */
3853 if ((dev->features & NETIF_F_TSO) &&
3854 !(dev->features & NETIF_F_SG)) {
3855 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
3857 dev->features &= ~NETIF_F_TSO;
3859 if (dev->features & NETIF_F_UFO) {
3860 if (!(dev->features & NETIF_F_HW_CSUM)) {
3861 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3862 "NETIF_F_HW_CSUM feature.\n",
3864 dev->features &= ~NETIF_F_UFO;
3866 if (!(dev->features & NETIF_F_SG)) {
3867 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3868 "NETIF_F_SG feature.\n",
3870 dev->features &= ~NETIF_F_UFO;
3874 netdev_initialize_kobject(dev);
3875 ret = netdev_register_kobject(dev);
3878 dev->reg_state = NETREG_REGISTERED;
3881 * Default initial state at registry is that the
3882 * device is present.
3885 set_bit(__LINK_STATE_PRESENT, &dev->state);
3887 dev_init_scheduler(dev);
3889 list_netdevice(dev);
3891 /* Notify protocols, that a new device appeared. */
3892 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
3893 ret = notifier_to_errno(ret);
3895 rollback_registered(dev);
3896 dev->reg_state = NETREG_UNREGISTERED;
3909 * register_netdev - register a network device
3910 * @dev: device to register
3912 * Take a completed network device structure and add it to the kernel
3913 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3914 * chain. 0 is returned on success. A negative errno code is returned
3915 * on a failure to set up the device, or if the name is a duplicate.
3917 * This is a wrapper around register_netdevice that takes the rtnl semaphore
3918 * and expands the device name if you passed a format string to
3921 int register_netdev(struct net_device *dev)
3928 * If the name is a format string the caller wants us to do a
3931 if (strchr(dev->name, '%')) {
3932 err = dev_alloc_name(dev, dev->name);
3937 err = register_netdevice(dev);
3942 EXPORT_SYMBOL(register_netdev);
3945 * netdev_wait_allrefs - wait until all references are gone.
3947 * This is called when unregistering network devices.
3949 * Any protocol or device that holds a reference should register
3950 * for netdevice notification, and cleanup and put back the
3951 * reference if they receive an UNREGISTER event.
3952 * We can get stuck here if buggy protocols don't correctly
3955 static void netdev_wait_allrefs(struct net_device *dev)
3957 unsigned long rebroadcast_time, warning_time;
3959 rebroadcast_time = warning_time = jiffies;
3960 while (atomic_read(&dev->refcnt) != 0) {
3961 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
3964 /* Rebroadcast unregister notification */
3965 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
3967 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
3969 /* We must not have linkwatch events
3970 * pending on unregister. If this
3971 * happens, we simply run the queue
3972 * unscheduled, resulting in a noop
3975 linkwatch_run_queue();
3980 rebroadcast_time = jiffies;
3985 if (time_after(jiffies, warning_time + 10 * HZ)) {
3986 printk(KERN_EMERG "unregister_netdevice: "
3987 "waiting for %s to become free. Usage "
3989 dev->name, atomic_read(&dev->refcnt));
3990 warning_time = jiffies;
3999 * register_netdevice(x1);
4000 * register_netdevice(x2);
4002 * unregister_netdevice(y1);
4003 * unregister_netdevice(y2);
4009 * We are invoked by rtnl_unlock() after it drops the semaphore.
4010 * This allows us to deal with problems:
4011 * 1) We can delete sysfs objects which invoke hotplug
4012 * without deadlocking with linkwatch via keventd.
4013 * 2) Since we run with the RTNL semaphore not held, we can sleep
4014 * safely in order to wait for the netdev refcnt to drop to zero.
4016 static DEFINE_MUTEX(net_todo_run_mutex);
4017 void netdev_run_todo(void)
4019 struct list_head list;
4021 /* Need to guard against multiple cpu's getting out of order. */
4022 mutex_lock(&net_todo_run_mutex);
4024 /* Not safe to do outside the semaphore. We must not return
4025 * until all unregister events invoked by the local processor
4026 * have been completed (either by this todo run, or one on
4029 if (list_empty(&net_todo_list))
4032 /* Snapshot list, allow later requests */
4033 spin_lock(&net_todo_list_lock);
4034 list_replace_init(&net_todo_list, &list);
4035 spin_unlock(&net_todo_list_lock);
4037 while (!list_empty(&list)) {
4038 struct net_device *dev
4039 = list_entry(list.next, struct net_device, todo_list);
4040 list_del(&dev->todo_list);
4042 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
4043 printk(KERN_ERR "network todo '%s' but state %d\n",
4044 dev->name, dev->reg_state);
4049 dev->reg_state = NETREG_UNREGISTERED;
4051 netdev_wait_allrefs(dev);
4054 BUG_ON(atomic_read(&dev->refcnt));
4055 BUG_TRAP(!dev->ip_ptr);
4056 BUG_TRAP(!dev->ip6_ptr);
4057 BUG_TRAP(!dev->dn_ptr);
4059 if (dev->destructor)
4060 dev->destructor(dev);
4062 /* Free network device */
4063 kobject_put(&dev->dev.kobj);
4067 mutex_unlock(&net_todo_run_mutex);
4070 static struct net_device_stats *internal_stats(struct net_device *dev)
4076 * alloc_netdev_mq - allocate network device
4077 * @sizeof_priv: size of private data to allocate space for
4078 * @name: device name format string
4079 * @setup: callback to initialize device
4080 * @queue_count: the number of subqueues to allocate
4082 * Allocates a struct net_device with private data area for driver use
4083 * and performs basic initialization. Also allocates subquue structs
4084 * for each queue on the device at the end of the netdevice.
4086 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
4087 void (*setup)(struct net_device *), unsigned int queue_count)
4090 struct net_device *dev;
4093 BUG_ON(strlen(name) >= sizeof(dev->name));
4095 alloc_size = sizeof(struct net_device) +
4096 sizeof(struct net_device_subqueue) * (queue_count - 1);
4098 /* ensure 32-byte alignment of private area */
4099 alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
4100 alloc_size += sizeof_priv;
4102 /* ensure 32-byte alignment of whole construct */
4103 alloc_size += NETDEV_ALIGN_CONST;
4105 p = kzalloc(alloc_size, GFP_KERNEL);
4107 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
4111 dev = (struct net_device *)
4112 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4113 dev->padded = (char *)dev - (char *)p;
4114 dev_net_set(dev, &init_net);
4117 dev->priv = ((char *)dev +
4118 ((sizeof(struct net_device) +
4119 (sizeof(struct net_device_subqueue) *
4120 (queue_count - 1)) + NETDEV_ALIGN_CONST)
4121 & ~NETDEV_ALIGN_CONST));
4124 dev->egress_subqueue_count = queue_count;
4125 dev->gso_max_size = GSO_MAX_SIZE;
4127 dev->get_stats = internal_stats;
4128 netpoll_netdev_init(dev);
4130 strcpy(dev->name, name);
4133 EXPORT_SYMBOL(alloc_netdev_mq);
4136 * free_netdev - free network device
4139 * This function does the last stage of destroying an allocated device
4140 * interface. The reference to the device object is released.
4141 * If this is the last reference then it will be freed.
4143 void free_netdev(struct net_device *dev)
4145 release_net(dev_net(dev));
4147 /* Compatibility with error handling in drivers */
4148 if (dev->reg_state == NETREG_UNINITIALIZED) {
4149 kfree((char *)dev - dev->padded);
4153 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
4154 dev->reg_state = NETREG_RELEASED;
4156 /* will free via device release */
4157 put_device(&dev->dev);
4160 /* Synchronize with packet receive processing. */
4161 void synchronize_net(void)
4168 * unregister_netdevice - remove device from the kernel
4171 * This function shuts down a device interface and removes it
4172 * from the kernel tables.
4174 * Callers must hold the rtnl semaphore. You may want
4175 * unregister_netdev() instead of this.
4178 void unregister_netdevice(struct net_device *dev)
4182 rollback_registered(dev);
4183 /* Finish processing unregister after unlock */
4188 * unregister_netdev - remove device from the kernel
4191 * This function shuts down a device interface and removes it
4192 * from the kernel tables.
4194 * This is just a wrapper for unregister_netdevice that takes
4195 * the rtnl semaphore. In general you want to use this and not
4196 * unregister_netdevice.
4198 void unregister_netdev(struct net_device *dev)
4201 unregister_netdevice(dev);
4205 EXPORT_SYMBOL(unregister_netdev);
4208 * dev_change_net_namespace - move device to different nethost namespace
4210 * @net: network namespace
4211 * @pat: If not NULL name pattern to try if the current device name
4212 * is already taken in the destination network namespace.
4214 * This function shuts down a device interface and moves it
4215 * to a new network namespace. On success 0 is returned, on
4216 * a failure a netagive errno code is returned.
4218 * Callers must hold the rtnl semaphore.
4221 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
4224 const char *destname;
4229 /* Don't allow namespace local devices to be moved. */
4231 if (dev->features & NETIF_F_NETNS_LOCAL)
4234 /* Ensure the device has been registrered */
4236 if (dev->reg_state != NETREG_REGISTERED)
4239 /* Get out if there is nothing todo */
4241 if (net_eq(dev_net(dev), net))
4244 /* Pick the destination device name, and ensure
4245 * we can use it in the destination network namespace.
4248 destname = dev->name;
4249 if (__dev_get_by_name(net, destname)) {
4250 /* We get here if we can't use the current device name */
4253 if (!dev_valid_name(pat))
4255 if (strchr(pat, '%')) {
4256 if (__dev_alloc_name(net, pat, buf) < 0)
4261 if (__dev_get_by_name(net, destname))
4266 * And now a mini version of register_netdevice unregister_netdevice.
4269 /* If device is running close it first. */
4272 /* And unlink it from device chain */
4274 unlist_netdevice(dev);
4278 /* Shutdown queueing discipline. */
4281 /* Notify protocols, that we are about to destroy
4282 this device. They should clean all the things.
4284 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4287 * Flush the unicast and multicast chains
4289 dev_addr_discard(dev);
4291 /* Actually switch the network namespace */
4292 dev_net_set(dev, net);
4294 /* Assign the new device name */
4295 if (destname != dev->name)
4296 strcpy(dev->name, destname);
4298 /* If there is an ifindex conflict assign a new one */
4299 if (__dev_get_by_index(net, dev->ifindex)) {
4300 int iflink = (dev->iflink == dev->ifindex);
4301 dev->ifindex = dev_new_index(net);
4303 dev->iflink = dev->ifindex;
4306 /* Fixup kobjects */
4307 netdev_unregister_kobject(dev);
4308 err = netdev_register_kobject(dev);
4311 /* Add the device back in the hashes */
4312 list_netdevice(dev);
4314 /* Notify protocols, that a new device appeared. */
4315 call_netdevice_notifiers(NETDEV_REGISTER, dev);
4323 static int dev_cpu_callback(struct notifier_block *nfb,
4324 unsigned long action,
4327 struct sk_buff **list_skb;
4328 struct net_device **list_net;
4329 struct sk_buff *skb;
4330 unsigned int cpu, oldcpu = (unsigned long)ocpu;
4331 struct softnet_data *sd, *oldsd;
4333 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
4336 local_irq_disable();
4337 cpu = smp_processor_id();
4338 sd = &per_cpu(softnet_data, cpu);
4339 oldsd = &per_cpu(softnet_data, oldcpu);
4341 /* Find end of our completion_queue. */
4342 list_skb = &sd->completion_queue;
4344 list_skb = &(*list_skb)->next;
4345 /* Append completion queue from offline CPU. */
4346 *list_skb = oldsd->completion_queue;
4347 oldsd->completion_queue = NULL;
4349 /* Find end of our output_queue. */
4350 list_net = &sd->output_queue;
4352 list_net = &(*list_net)->next_sched;
4353 /* Append output queue from offline CPU. */
4354 *list_net = oldsd->output_queue;
4355 oldsd->output_queue = NULL;
4357 raise_softirq_irqoff(NET_TX_SOFTIRQ);
4360 /* Process offline CPU's input_pkt_queue */
4361 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
4367 #ifdef CONFIG_NET_DMA
4369 * net_dma_rebalance - try to maintain one DMA channel per CPU
4370 * @net_dma: DMA client and associated data (lock, channels, channel_mask)
4372 * This is called when the number of channels allocated to the net_dma client
4373 * changes. The net_dma client tries to have one DMA channel per CPU.
4376 static void net_dma_rebalance(struct net_dma *net_dma)
4378 unsigned int cpu, i, n, chan_idx;
4379 struct dma_chan *chan;
4381 if (cpus_empty(net_dma->channel_mask)) {
4382 for_each_online_cpu(cpu)
4383 rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
4388 cpu = first_cpu(cpu_online_map);
4390 for_each_cpu_mask(chan_idx, net_dma->channel_mask) {
4391 chan = net_dma->channels[chan_idx];
4393 n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask))
4394 + (i < (num_online_cpus() %
4395 cpus_weight(net_dma->channel_mask)) ? 1 : 0));
4398 per_cpu(softnet_data, cpu).net_dma = chan;
4399 cpu = next_cpu(cpu, cpu_online_map);
4407 * netdev_dma_event - event callback for the net_dma_client
4408 * @client: should always be net_dma_client
4409 * @chan: DMA channel for the event
4410 * @state: DMA state to be handled
4412 static enum dma_state_client
4413 netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
4414 enum dma_state state)
4416 int i, found = 0, pos = -1;
4417 struct net_dma *net_dma =
4418 container_of(client, struct net_dma, client);
4419 enum dma_state_client ack = DMA_DUP; /* default: take no action */
4421 spin_lock(&net_dma->lock);
4423 case DMA_RESOURCE_AVAILABLE:
4424 for (i = 0; i < nr_cpu_ids; i++)
4425 if (net_dma->channels[i] == chan) {
4428 } else if (net_dma->channels[i] == NULL && pos < 0)
4431 if (!found && pos >= 0) {
4433 net_dma->channels[pos] = chan;
4434 cpu_set(pos, net_dma->channel_mask);
4435 net_dma_rebalance(net_dma);
4438 case DMA_RESOURCE_REMOVED:
4439 for (i = 0; i < nr_cpu_ids; i++)
4440 if (net_dma->channels[i] == chan) {
4448 cpu_clear(pos, net_dma->channel_mask);
4449 net_dma->channels[i] = NULL;
4450 net_dma_rebalance(net_dma);
4456 spin_unlock(&net_dma->lock);
4462 * netdev_dma_regiser - register the networking subsystem as a DMA client
4464 static int __init netdev_dma_register(void)
4466 net_dma.channels = kzalloc(nr_cpu_ids * sizeof(struct net_dma),
4468 if (unlikely(!net_dma.channels)) {
4470 "netdev_dma: no memory for net_dma.channels\n");
4473 spin_lock_init(&net_dma.lock);
4474 dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask);
4475 dma_async_client_register(&net_dma.client);
4476 dma_async_client_chan_request(&net_dma.client);
4481 static int __init netdev_dma_register(void) { return -ENODEV; }
4482 #endif /* CONFIG_NET_DMA */
4485 * netdev_compute_feature - compute conjunction of two feature sets
4486 * @all: first feature set
4487 * @one: second feature set
4489 * Computes a new feature set after adding a device with feature set
4490 * @one to the master device with current feature set @all. Returns
4491 * the new feature set.
4493 int netdev_compute_features(unsigned long all, unsigned long one)
4495 /* if device needs checksumming, downgrade to hw checksumming */
4496 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
4497 all ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
4499 /* if device can't do all checksum, downgrade to ipv4/ipv6 */
4500 if (all & NETIF_F_HW_CSUM && !(one & NETIF_F_HW_CSUM))
4501 all ^= NETIF_F_HW_CSUM
4502 | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
4504 if (one & NETIF_F_GSO)
4505 one |= NETIF_F_GSO_SOFTWARE;
4508 /* If even one device supports robust GSO, enable it for all. */
4509 if (one & NETIF_F_GSO_ROBUST)
4510 all |= NETIF_F_GSO_ROBUST;
4512 all &= one | NETIF_F_LLTX;
4514 if (!(all & NETIF_F_ALL_CSUM))
4516 if (!(all & NETIF_F_SG))
4517 all &= ~NETIF_F_GSO_MASK;
4521 EXPORT_SYMBOL(netdev_compute_features);
4523 static struct hlist_head *netdev_create_hash(void)
4526 struct hlist_head *hash;
4528 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
4530 for (i = 0; i < NETDEV_HASHENTRIES; i++)
4531 INIT_HLIST_HEAD(&hash[i]);
4536 /* Initialize per network namespace state */
4537 static int __net_init netdev_init(struct net *net)
4539 INIT_LIST_HEAD(&net->dev_base_head);
4541 net->dev_name_head = netdev_create_hash();
4542 if (net->dev_name_head == NULL)
4545 net->dev_index_head = netdev_create_hash();
4546 if (net->dev_index_head == NULL)
4552 kfree(net->dev_name_head);
4557 static void __net_exit netdev_exit(struct net *net)
4559 kfree(net->dev_name_head);
4560 kfree(net->dev_index_head);
4563 static struct pernet_operations __net_initdata netdev_net_ops = {
4564 .init = netdev_init,
4565 .exit = netdev_exit,
4568 static void __net_exit default_device_exit(struct net *net)
4570 struct net_device *dev, *next;
4572 * Push all migratable of the network devices back to the
4573 * initial network namespace
4576 for_each_netdev_safe(net, dev, next) {
4578 char fb_name[IFNAMSIZ];
4580 /* Ignore unmoveable devices (i.e. loopback) */
4581 if (dev->features & NETIF_F_NETNS_LOCAL)
4584 /* Push remaing network devices to init_net */
4585 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
4586 err = dev_change_net_namespace(dev, &init_net, fb_name);
4588 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
4589 __func__, dev->name, err);
4596 static struct pernet_operations __net_initdata default_device_ops = {
4597 .exit = default_device_exit,
4601 * Initialize the DEV module. At boot time this walks the device list and
4602 * unhooks any devices that fail to initialise (normally hardware not
4603 * present) and leaves us with a valid list of present and active devices.
4608 * This is called single threaded during boot, so no need
4609 * to take the rtnl semaphore.
4611 static int __init net_dev_init(void)
4613 int i, rc = -ENOMEM;
4615 BUG_ON(!dev_boot_phase);
4617 if (dev_proc_init())
4620 if (netdev_kobject_init())
4623 INIT_LIST_HEAD(&ptype_all);
4624 for (i = 0; i < PTYPE_HASH_SIZE; i++)
4625 INIT_LIST_HEAD(&ptype_base[i]);
4627 if (register_pernet_subsys(&netdev_net_ops))
4630 if (register_pernet_device(&default_device_ops))
4634 * Initialise the packet receive queues.
4637 for_each_possible_cpu(i) {
4638 struct softnet_data *queue;
4640 queue = &per_cpu(softnet_data, i);
4641 skb_queue_head_init(&queue->input_pkt_queue);
4642 queue->completion_queue = NULL;
4643 INIT_LIST_HEAD(&queue->poll_list);
4645 queue->backlog.poll = process_backlog;
4646 queue->backlog.weight = weight_p;
4649 netdev_dma_register();
4653 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
4654 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
4656 hotcpu_notifier(dev_cpu_callback, 0);
4664 subsys_initcall(net_dev_init);
4666 EXPORT_SYMBOL(__dev_get_by_index);
4667 EXPORT_SYMBOL(__dev_get_by_name);
4668 EXPORT_SYMBOL(__dev_remove_pack);
4669 EXPORT_SYMBOL(dev_valid_name);
4670 EXPORT_SYMBOL(dev_add_pack);
4671 EXPORT_SYMBOL(dev_alloc_name);
4672 EXPORT_SYMBOL(dev_close);
4673 EXPORT_SYMBOL(dev_get_by_flags);
4674 EXPORT_SYMBOL(dev_get_by_index);
4675 EXPORT_SYMBOL(dev_get_by_name);
4676 EXPORT_SYMBOL(dev_open);
4677 EXPORT_SYMBOL(dev_queue_xmit);
4678 EXPORT_SYMBOL(dev_remove_pack);
4679 EXPORT_SYMBOL(dev_set_allmulti);
4680 EXPORT_SYMBOL(dev_set_promiscuity);
4681 EXPORT_SYMBOL(dev_change_flags);
4682 EXPORT_SYMBOL(dev_set_mtu);
4683 EXPORT_SYMBOL(dev_set_mac_address);
4684 EXPORT_SYMBOL(free_netdev);
4685 EXPORT_SYMBOL(netdev_boot_setup_check);
4686 EXPORT_SYMBOL(netdev_set_master);
4687 EXPORT_SYMBOL(netdev_state_change);
4688 EXPORT_SYMBOL(netif_receive_skb);
4689 EXPORT_SYMBOL(netif_rx);
4690 EXPORT_SYMBOL(register_gifconf);
4691 EXPORT_SYMBOL(register_netdevice);
4692 EXPORT_SYMBOL(register_netdevice_notifier);
4693 EXPORT_SYMBOL(skb_checksum_help);
4694 EXPORT_SYMBOL(synchronize_net);
4695 EXPORT_SYMBOL(unregister_netdevice);
4696 EXPORT_SYMBOL(unregister_netdevice_notifier);
4697 EXPORT_SYMBOL(net_enable_timestamp);
4698 EXPORT_SYMBOL(net_disable_timestamp);
4699 EXPORT_SYMBOL(dev_get_flags);
4701 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
4702 EXPORT_SYMBOL(br_handle_frame_hook);
4703 EXPORT_SYMBOL(br_fdb_get_hook);
4704 EXPORT_SYMBOL(br_fdb_put_hook);
4708 EXPORT_SYMBOL(dev_load);
4711 EXPORT_PER_CPU_SYMBOL(softnet_data);