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;
1670 struct netdev_queue *txq;
1674 /* GSO will handle the following emulations directly. */
1675 if (netif_needs_gso(dev, skb))
1678 if (skb_shinfo(skb)->frag_list &&
1679 !(dev->features & NETIF_F_FRAGLIST) &&
1680 __skb_linearize(skb))
1683 /* Fragmented skb is linearized if device does not support SG,
1684 * or if at least one of fragments is in highmem and device
1685 * does not support DMA from it.
1687 if (skb_shinfo(skb)->nr_frags &&
1688 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1689 __skb_linearize(skb))
1692 /* If packet is not checksummed and device does not support
1693 * checksumming for this protocol, complete checksumming here.
1695 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1696 skb_set_transport_header(skb, skb->csum_start -
1698 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
1703 txq = &dev->tx_queue;
1704 spin_lock_prefetch(&txq->lock);
1706 /* Disable soft irqs for various locks below. Also
1707 * stops preemption for RCU.
1711 /* Updates of qdisc are serialized by queue->lock.
1712 * The struct Qdisc which is pointed to by qdisc is now a
1713 * rcu structure - it may be accessed without acquiring
1714 * a lock (but the structure may be stale.) The freeing of the
1715 * qdisc will be deferred until it's known that there are no
1716 * more references to it.
1718 * If the qdisc has an enqueue function, we still need to
1719 * hold the queue->lock before calling it, since queue->lock
1720 * also serializes access to the device queue.
1723 q = rcu_dereference(txq->qdisc);
1724 #ifdef CONFIG_NET_CLS_ACT
1725 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1728 /* Grab device queue */
1729 spin_lock(&txq->lock);
1732 /* reset queue_mapping to zero */
1733 skb_set_queue_mapping(skb, 0);
1734 rc = q->enqueue(skb, q);
1736 spin_unlock(&txq->lock);
1738 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1741 spin_unlock(&txq->lock);
1744 /* The device has no queue. Common case for software devices:
1745 loopback, all the sorts of tunnels...
1747 Really, it is unlikely that netif_tx_lock protection is necessary
1748 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1750 However, it is possible, that they rely on protection
1753 Check this and shot the lock. It is not prone from deadlocks.
1754 Either shot noqueue qdisc, it is even simpler 8)
1756 if (dev->flags & IFF_UP) {
1757 int cpu = smp_processor_id(); /* ok because BHs are off */
1759 if (dev->xmit_lock_owner != cpu) {
1761 HARD_TX_LOCK(dev, cpu);
1763 if (!netif_queue_stopped(dev) &&
1764 !netif_subqueue_stopped(dev, skb)) {
1766 if (!dev_hard_start_xmit(skb, dev)) {
1767 HARD_TX_UNLOCK(dev);
1771 HARD_TX_UNLOCK(dev);
1772 if (net_ratelimit())
1773 printk(KERN_CRIT "Virtual device %s asks to "
1774 "queue packet!\n", dev->name);
1776 /* Recursion is detected! It is possible,
1778 if (net_ratelimit())
1779 printk(KERN_CRIT "Dead loop on virtual device "
1780 "%s, fix it urgently!\n", dev->name);
1785 rcu_read_unlock_bh();
1791 rcu_read_unlock_bh();
1796 /*=======================================================================
1798 =======================================================================*/
1800 int netdev_max_backlog __read_mostly = 1000;
1801 int netdev_budget __read_mostly = 300;
1802 int weight_p __read_mostly = 64; /* old backlog weight */
1804 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1808 * netif_rx - post buffer to the network code
1809 * @skb: buffer to post
1811 * This function receives a packet from a device driver and queues it for
1812 * the upper (protocol) levels to process. It always succeeds. The buffer
1813 * may be dropped during processing for congestion control or by the
1817 * NET_RX_SUCCESS (no congestion)
1818 * NET_RX_DROP (packet was dropped)
1822 int netif_rx(struct sk_buff *skb)
1824 struct softnet_data *queue;
1825 unsigned long flags;
1827 /* if netpoll wants it, pretend we never saw it */
1828 if (netpoll_rx(skb))
1831 if (!skb->tstamp.tv64)
1835 * The code is rearranged so that the path is the most
1836 * short when CPU is congested, but is still operating.
1838 local_irq_save(flags);
1839 queue = &__get_cpu_var(softnet_data);
1841 __get_cpu_var(netdev_rx_stat).total++;
1842 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1843 if (queue->input_pkt_queue.qlen) {
1846 __skb_queue_tail(&queue->input_pkt_queue, skb);
1847 local_irq_restore(flags);
1848 return NET_RX_SUCCESS;
1851 napi_schedule(&queue->backlog);
1855 __get_cpu_var(netdev_rx_stat).dropped++;
1856 local_irq_restore(flags);
1862 int netif_rx_ni(struct sk_buff *skb)
1867 err = netif_rx(skb);
1868 if (local_softirq_pending())
1875 EXPORT_SYMBOL(netif_rx_ni);
1877 static inline struct net_device *skb_bond(struct sk_buff *skb)
1879 struct net_device *dev = skb->dev;
1882 if (skb_bond_should_drop(skb)) {
1886 skb->dev = dev->master;
1893 static void net_tx_action(struct softirq_action *h)
1895 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1897 if (sd->completion_queue) {
1898 struct sk_buff *clist;
1900 local_irq_disable();
1901 clist = sd->completion_queue;
1902 sd->completion_queue = NULL;
1906 struct sk_buff *skb = clist;
1907 clist = clist->next;
1909 BUG_TRAP(!atomic_read(&skb->users));
1914 if (sd->output_queue) {
1915 struct net_device *head;
1917 local_irq_disable();
1918 head = sd->output_queue;
1919 sd->output_queue = NULL;
1923 struct net_device *dev = head;
1924 struct netdev_queue *txq;
1925 head = head->next_sched;
1927 txq = &dev->tx_queue;
1929 smp_mb__before_clear_bit();
1930 clear_bit(__LINK_STATE_SCHED, &dev->state);
1932 if (spin_trylock(&txq->lock)) {
1934 spin_unlock(&txq->lock);
1936 netif_schedule(dev);
1942 static inline int deliver_skb(struct sk_buff *skb,
1943 struct packet_type *pt_prev,
1944 struct net_device *orig_dev)
1946 atomic_inc(&skb->users);
1947 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1950 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1951 /* These hooks defined here for ATM */
1953 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1954 unsigned char *addr);
1955 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
1958 * If bridge module is loaded call bridging hook.
1959 * returns NULL if packet was consumed.
1961 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
1962 struct sk_buff *skb) __read_mostly;
1963 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
1964 struct packet_type **pt_prev, int *ret,
1965 struct net_device *orig_dev)
1967 struct net_bridge_port *port;
1969 if (skb->pkt_type == PACKET_LOOPBACK ||
1970 (port = rcu_dereference(skb->dev->br_port)) == NULL)
1974 *ret = deliver_skb(skb, *pt_prev, orig_dev);
1978 return br_handle_frame_hook(port, skb);
1981 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
1984 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
1985 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
1986 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
1988 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
1989 struct packet_type **pt_prev,
1991 struct net_device *orig_dev)
1993 if (skb->dev->macvlan_port == NULL)
1997 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2000 return macvlan_handle_frame_hook(skb);
2003 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2006 #ifdef CONFIG_NET_CLS_ACT
2007 /* TODO: Maybe we should just force sch_ingress to be compiled in
2008 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2009 * a compare and 2 stores extra right now if we dont have it on
2010 * but have CONFIG_NET_CLS_ACT
2011 * NOTE: This doesnt stop any functionality; if you dont have
2012 * the ingress scheduler, you just cant add policies on ingress.
2015 static int ing_filter(struct sk_buff *skb)
2017 struct net_device *dev = skb->dev;
2018 u32 ttl = G_TC_RTTL(skb->tc_verd);
2019 struct netdev_queue *rxq;
2020 int result = TC_ACT_OK;
2023 if (MAX_RED_LOOP < ttl++) {
2025 "Redir loop detected Dropping packet (%d->%d)\n",
2026 skb->iif, dev->ifindex);
2030 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2031 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2033 rxq = &dev->rx_queue;
2035 spin_lock(&rxq->lock);
2036 if ((q = rxq->qdisc) != NULL)
2037 result = q->enqueue(skb, q);
2038 spin_unlock(&rxq->lock);
2043 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2044 struct packet_type **pt_prev,
2045 int *ret, struct net_device *orig_dev)
2047 if (!skb->dev->rx_queue.qdisc)
2051 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2054 /* Huh? Why does turning on AF_PACKET affect this? */
2055 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2058 switch (ing_filter(skb)) {
2072 * netif_receive_skb - process receive buffer from network
2073 * @skb: buffer to process
2075 * netif_receive_skb() is the main receive data processing function.
2076 * It always succeeds. The buffer may be dropped during processing
2077 * for congestion control or by the protocol layers.
2079 * This function may only be called from softirq context and interrupts
2080 * should be enabled.
2082 * Return values (usually ignored):
2083 * NET_RX_SUCCESS: no congestion
2084 * NET_RX_DROP: packet was dropped
2086 int netif_receive_skb(struct sk_buff *skb)
2088 struct packet_type *ptype, *pt_prev;
2089 struct net_device *orig_dev;
2090 int ret = NET_RX_DROP;
2093 /* if we've gotten here through NAPI, check netpoll */
2094 if (netpoll_receive_skb(skb))
2097 if (!skb->tstamp.tv64)
2101 skb->iif = skb->dev->ifindex;
2103 orig_dev = skb_bond(skb);
2108 __get_cpu_var(netdev_rx_stat).total++;
2110 skb_reset_network_header(skb);
2111 skb_reset_transport_header(skb);
2112 skb->mac_len = skb->network_header - skb->mac_header;
2118 /* Don't receive packets in an exiting network namespace */
2119 if (!net_alive(dev_net(skb->dev)))
2122 #ifdef CONFIG_NET_CLS_ACT
2123 if (skb->tc_verd & TC_NCLS) {
2124 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2129 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2130 if (!ptype->dev || ptype->dev == skb->dev) {
2132 ret = deliver_skb(skb, pt_prev, orig_dev);
2137 #ifdef CONFIG_NET_CLS_ACT
2138 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2144 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2147 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2151 type = skb->protocol;
2152 list_for_each_entry_rcu(ptype,
2153 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2154 if (ptype->type == type &&
2155 (!ptype->dev || ptype->dev == skb->dev)) {
2157 ret = deliver_skb(skb, pt_prev, orig_dev);
2163 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2166 /* Jamal, now you will not able to escape explaining
2167 * me how you were going to use this. :-)
2177 static int process_backlog(struct napi_struct *napi, int quota)
2180 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2181 unsigned long start_time = jiffies;
2183 napi->weight = weight_p;
2185 struct sk_buff *skb;
2186 struct net_device *dev;
2188 local_irq_disable();
2189 skb = __skb_dequeue(&queue->input_pkt_queue);
2191 __napi_complete(napi);
2200 netif_receive_skb(skb);
2203 } while (++work < quota && jiffies == start_time);
2209 * __napi_schedule - schedule for receive
2210 * @n: entry to schedule
2212 * The entry's receive function will be scheduled to run
2214 void __napi_schedule(struct napi_struct *n)
2216 unsigned long flags;
2218 local_irq_save(flags);
2219 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
2220 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2221 local_irq_restore(flags);
2223 EXPORT_SYMBOL(__napi_schedule);
2226 static void net_rx_action(struct softirq_action *h)
2228 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
2229 unsigned long start_time = jiffies;
2230 int budget = netdev_budget;
2233 local_irq_disable();
2235 while (!list_empty(list)) {
2236 struct napi_struct *n;
2239 /* If softirq window is exhuasted then punt.
2241 * Note that this is a slight policy change from the
2242 * previous NAPI code, which would allow up to 2
2243 * jiffies to pass before breaking out. The test
2244 * used to be "jiffies - start_time > 1".
2246 if (unlikely(budget <= 0 || jiffies != start_time))
2251 /* Even though interrupts have been re-enabled, this
2252 * access is safe because interrupts can only add new
2253 * entries to the tail of this list, and only ->poll()
2254 * calls can remove this head entry from the list.
2256 n = list_entry(list->next, struct napi_struct, poll_list);
2258 have = netpoll_poll_lock(n);
2262 /* This NAPI_STATE_SCHED test is for avoiding a race
2263 * with netpoll's poll_napi(). Only the entity which
2264 * obtains the lock and sees NAPI_STATE_SCHED set will
2265 * actually make the ->poll() call. Therefore we avoid
2266 * accidently calling ->poll() when NAPI is not scheduled.
2269 if (test_bit(NAPI_STATE_SCHED, &n->state))
2270 work = n->poll(n, weight);
2272 WARN_ON_ONCE(work > weight);
2276 local_irq_disable();
2278 /* Drivers must not modify the NAPI state if they
2279 * consume the entire weight. In such cases this code
2280 * still "owns" the NAPI instance and therefore can
2281 * move the instance around on the list at-will.
2283 if (unlikely(work == weight)) {
2284 if (unlikely(napi_disable_pending(n)))
2287 list_move_tail(&n->poll_list, list);
2290 netpoll_poll_unlock(have);
2295 #ifdef CONFIG_NET_DMA
2297 * There may not be any more sk_buffs coming right now, so push
2298 * any pending DMA copies to hardware
2300 if (!cpus_empty(net_dma.channel_mask)) {
2302 for_each_cpu_mask(chan_idx, net_dma.channel_mask) {
2303 struct dma_chan *chan = net_dma.channels[chan_idx];
2305 dma_async_memcpy_issue_pending(chan);
2313 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2314 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2318 static gifconf_func_t * gifconf_list [NPROTO];
2321 * register_gifconf - register a SIOCGIF handler
2322 * @family: Address family
2323 * @gifconf: Function handler
2325 * Register protocol dependent address dumping routines. The handler
2326 * that is passed must not be freed or reused until it has been replaced
2327 * by another handler.
2329 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
2331 if (family >= NPROTO)
2333 gifconf_list[family] = gifconf;
2339 * Map an interface index to its name (SIOCGIFNAME)
2343 * We need this ioctl for efficient implementation of the
2344 * if_indextoname() function required by the IPv6 API. Without
2345 * it, we would have to search all the interfaces to find a
2349 static int dev_ifname(struct net *net, struct ifreq __user *arg)
2351 struct net_device *dev;
2355 * Fetch the caller's info block.
2358 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2361 read_lock(&dev_base_lock);
2362 dev = __dev_get_by_index(net, ifr.ifr_ifindex);
2364 read_unlock(&dev_base_lock);
2368 strcpy(ifr.ifr_name, dev->name);
2369 read_unlock(&dev_base_lock);
2371 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2377 * Perform a SIOCGIFCONF call. This structure will change
2378 * size eventually, and there is nothing I can do about it.
2379 * Thus we will need a 'compatibility mode'.
2382 static int dev_ifconf(struct net *net, char __user *arg)
2385 struct net_device *dev;
2392 * Fetch the caller's info block.
2395 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2402 * Loop over the interfaces, and write an info block for each.
2406 for_each_netdev(net, dev) {
2407 for (i = 0; i < NPROTO; i++) {
2408 if (gifconf_list[i]) {
2411 done = gifconf_list[i](dev, NULL, 0);
2413 done = gifconf_list[i](dev, pos + total,
2423 * All done. Write the updated control block back to the caller.
2425 ifc.ifc_len = total;
2428 * Both BSD and Solaris return 0 here, so we do too.
2430 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2433 #ifdef CONFIG_PROC_FS
2435 * This is invoked by the /proc filesystem handler to display a device
2438 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2439 __acquires(dev_base_lock)
2441 struct net *net = seq_file_net(seq);
2443 struct net_device *dev;
2445 read_lock(&dev_base_lock);
2447 return SEQ_START_TOKEN;
2450 for_each_netdev(net, dev)
2457 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2459 struct net *net = seq_file_net(seq);
2461 return v == SEQ_START_TOKEN ?
2462 first_net_device(net) : next_net_device((struct net_device *)v);
2465 void dev_seq_stop(struct seq_file *seq, void *v)
2466 __releases(dev_base_lock)
2468 read_unlock(&dev_base_lock);
2471 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2473 struct net_device_stats *stats = dev->get_stats(dev);
2475 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2476 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2477 dev->name, stats->rx_bytes, stats->rx_packets,
2479 stats->rx_dropped + stats->rx_missed_errors,
2480 stats->rx_fifo_errors,
2481 stats->rx_length_errors + stats->rx_over_errors +
2482 stats->rx_crc_errors + stats->rx_frame_errors,
2483 stats->rx_compressed, stats->multicast,
2484 stats->tx_bytes, stats->tx_packets,
2485 stats->tx_errors, stats->tx_dropped,
2486 stats->tx_fifo_errors, stats->collisions,
2487 stats->tx_carrier_errors +
2488 stats->tx_aborted_errors +
2489 stats->tx_window_errors +
2490 stats->tx_heartbeat_errors,
2491 stats->tx_compressed);
2495 * Called from the PROCfs module. This now uses the new arbitrary sized
2496 * /proc/net interface to create /proc/net/dev
2498 static int dev_seq_show(struct seq_file *seq, void *v)
2500 if (v == SEQ_START_TOKEN)
2501 seq_puts(seq, "Inter-| Receive "
2503 " face |bytes packets errs drop fifo frame "
2504 "compressed multicast|bytes packets errs "
2505 "drop fifo colls carrier compressed\n");
2507 dev_seq_printf_stats(seq, v);
2511 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2513 struct netif_rx_stats *rc = NULL;
2515 while (*pos < nr_cpu_ids)
2516 if (cpu_online(*pos)) {
2517 rc = &per_cpu(netdev_rx_stat, *pos);
2524 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2526 return softnet_get_online(pos);
2529 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2532 return softnet_get_online(pos);
2535 static void softnet_seq_stop(struct seq_file *seq, void *v)
2539 static int softnet_seq_show(struct seq_file *seq, void *v)
2541 struct netif_rx_stats *s = v;
2543 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2544 s->total, s->dropped, s->time_squeeze, 0,
2545 0, 0, 0, 0, /* was fastroute */
2550 static const struct seq_operations dev_seq_ops = {
2551 .start = dev_seq_start,
2552 .next = dev_seq_next,
2553 .stop = dev_seq_stop,
2554 .show = dev_seq_show,
2557 static int dev_seq_open(struct inode *inode, struct file *file)
2559 return seq_open_net(inode, file, &dev_seq_ops,
2560 sizeof(struct seq_net_private));
2563 static const struct file_operations dev_seq_fops = {
2564 .owner = THIS_MODULE,
2565 .open = dev_seq_open,
2567 .llseek = seq_lseek,
2568 .release = seq_release_net,
2571 static const struct seq_operations softnet_seq_ops = {
2572 .start = softnet_seq_start,
2573 .next = softnet_seq_next,
2574 .stop = softnet_seq_stop,
2575 .show = softnet_seq_show,
2578 static int softnet_seq_open(struct inode *inode, struct file *file)
2580 return seq_open(file, &softnet_seq_ops);
2583 static const struct file_operations softnet_seq_fops = {
2584 .owner = THIS_MODULE,
2585 .open = softnet_seq_open,
2587 .llseek = seq_lseek,
2588 .release = seq_release,
2591 static void *ptype_get_idx(loff_t pos)
2593 struct packet_type *pt = NULL;
2597 list_for_each_entry_rcu(pt, &ptype_all, list) {
2603 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
2604 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
2613 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
2617 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
2620 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2622 struct packet_type *pt;
2623 struct list_head *nxt;
2627 if (v == SEQ_START_TOKEN)
2628 return ptype_get_idx(0);
2631 nxt = pt->list.next;
2632 if (pt->type == htons(ETH_P_ALL)) {
2633 if (nxt != &ptype_all)
2636 nxt = ptype_base[0].next;
2638 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
2640 while (nxt == &ptype_base[hash]) {
2641 if (++hash >= PTYPE_HASH_SIZE)
2643 nxt = ptype_base[hash].next;
2646 return list_entry(nxt, struct packet_type, list);
2649 static void ptype_seq_stop(struct seq_file *seq, void *v)
2655 static void ptype_seq_decode(struct seq_file *seq, void *sym)
2657 #ifdef CONFIG_KALLSYMS
2658 unsigned long offset = 0, symsize;
2659 const char *symname;
2663 symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset,
2670 modname = delim = "";
2671 seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim,
2677 seq_printf(seq, "[%p]", sym);
2680 static int ptype_seq_show(struct seq_file *seq, void *v)
2682 struct packet_type *pt = v;
2684 if (v == SEQ_START_TOKEN)
2685 seq_puts(seq, "Type Device Function\n");
2686 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
2687 if (pt->type == htons(ETH_P_ALL))
2688 seq_puts(seq, "ALL ");
2690 seq_printf(seq, "%04x", ntohs(pt->type));
2692 seq_printf(seq, " %-8s ",
2693 pt->dev ? pt->dev->name : "");
2694 ptype_seq_decode(seq, pt->func);
2695 seq_putc(seq, '\n');
2701 static const struct seq_operations ptype_seq_ops = {
2702 .start = ptype_seq_start,
2703 .next = ptype_seq_next,
2704 .stop = ptype_seq_stop,
2705 .show = ptype_seq_show,
2708 static int ptype_seq_open(struct inode *inode, struct file *file)
2710 return seq_open_net(inode, file, &ptype_seq_ops,
2711 sizeof(struct seq_net_private));
2714 static const struct file_operations ptype_seq_fops = {
2715 .owner = THIS_MODULE,
2716 .open = ptype_seq_open,
2718 .llseek = seq_lseek,
2719 .release = seq_release_net,
2723 static int __net_init dev_proc_net_init(struct net *net)
2727 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
2729 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
2731 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
2734 if (wext_proc_init(net))
2740 proc_net_remove(net, "ptype");
2742 proc_net_remove(net, "softnet_stat");
2744 proc_net_remove(net, "dev");
2748 static void __net_exit dev_proc_net_exit(struct net *net)
2750 wext_proc_exit(net);
2752 proc_net_remove(net, "ptype");
2753 proc_net_remove(net, "softnet_stat");
2754 proc_net_remove(net, "dev");
2757 static struct pernet_operations __net_initdata dev_proc_ops = {
2758 .init = dev_proc_net_init,
2759 .exit = dev_proc_net_exit,
2762 static int __init dev_proc_init(void)
2764 return register_pernet_subsys(&dev_proc_ops);
2767 #define dev_proc_init() 0
2768 #endif /* CONFIG_PROC_FS */
2772 * netdev_set_master - set up master/slave pair
2773 * @slave: slave device
2774 * @master: new master device
2776 * Changes the master device of the slave. Pass %NULL to break the
2777 * bonding. The caller must hold the RTNL semaphore. On a failure
2778 * a negative errno code is returned. On success the reference counts
2779 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2780 * function returns zero.
2782 int netdev_set_master(struct net_device *slave, struct net_device *master)
2784 struct net_device *old = slave->master;
2794 slave->master = master;
2802 slave->flags |= IFF_SLAVE;
2804 slave->flags &= ~IFF_SLAVE;
2806 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2810 static int __dev_set_promiscuity(struct net_device *dev, int inc)
2812 unsigned short old_flags = dev->flags;
2816 dev->flags |= IFF_PROMISC;
2817 dev->promiscuity += inc;
2818 if (dev->promiscuity == 0) {
2821 * If inc causes overflow, untouch promisc and return error.
2824 dev->flags &= ~IFF_PROMISC;
2826 dev->promiscuity -= inc;
2827 printk(KERN_WARNING "%s: promiscuity touches roof, "
2828 "set promiscuity failed, promiscuity feature "
2829 "of device might be broken.\n", dev->name);
2833 if (dev->flags != old_flags) {
2834 printk(KERN_INFO "device %s %s promiscuous mode\n",
2835 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2838 audit_log(current->audit_context, GFP_ATOMIC,
2839 AUDIT_ANOM_PROMISCUOUS,
2840 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
2841 dev->name, (dev->flags & IFF_PROMISC),
2842 (old_flags & IFF_PROMISC),
2843 audit_get_loginuid(current),
2844 current->uid, current->gid,
2845 audit_get_sessionid(current));
2847 if (dev->change_rx_flags)
2848 dev->change_rx_flags(dev, IFF_PROMISC);
2854 * dev_set_promiscuity - update promiscuity count on a device
2858 * Add or remove promiscuity from a device. While the count in the device
2859 * remains above zero the interface remains promiscuous. Once it hits zero
2860 * the device reverts back to normal filtering operation. A negative inc
2861 * value is used to drop promiscuity on the device.
2862 * Return 0 if successful or a negative errno code on error.
2864 int dev_set_promiscuity(struct net_device *dev, int inc)
2866 unsigned short old_flags = dev->flags;
2869 err = __dev_set_promiscuity(dev, inc);
2872 if (dev->flags != old_flags)
2873 dev_set_rx_mode(dev);
2878 * dev_set_allmulti - update allmulti count on a device
2882 * Add or remove reception of all multicast frames to a device. While the
2883 * count in the device remains above zero the interface remains listening
2884 * to all interfaces. Once it hits zero the device reverts back to normal
2885 * filtering operation. A negative @inc value is used to drop the counter
2886 * when releasing a resource needing all multicasts.
2887 * Return 0 if successful or a negative errno code on error.
2890 int dev_set_allmulti(struct net_device *dev, int inc)
2892 unsigned short old_flags = dev->flags;
2896 dev->flags |= IFF_ALLMULTI;
2897 dev->allmulti += inc;
2898 if (dev->allmulti == 0) {
2901 * If inc causes overflow, untouch allmulti and return error.
2904 dev->flags &= ~IFF_ALLMULTI;
2906 dev->allmulti -= inc;
2907 printk(KERN_WARNING "%s: allmulti touches roof, "
2908 "set allmulti failed, allmulti feature of "
2909 "device might be broken.\n", dev->name);
2913 if (dev->flags ^ old_flags) {
2914 if (dev->change_rx_flags)
2915 dev->change_rx_flags(dev, IFF_ALLMULTI);
2916 dev_set_rx_mode(dev);
2922 * Upload unicast and multicast address lists to device and
2923 * configure RX filtering. When the device doesn't support unicast
2924 * filtering it is put in promiscuous mode while unicast addresses
2927 void __dev_set_rx_mode(struct net_device *dev)
2929 /* dev_open will call this function so the list will stay sane. */
2930 if (!(dev->flags&IFF_UP))
2933 if (!netif_device_present(dev))
2936 if (dev->set_rx_mode)
2937 dev->set_rx_mode(dev);
2939 /* Unicast addresses changes may only happen under the rtnl,
2940 * therefore calling __dev_set_promiscuity here is safe.
2942 if (dev->uc_count > 0 && !dev->uc_promisc) {
2943 __dev_set_promiscuity(dev, 1);
2944 dev->uc_promisc = 1;
2945 } else if (dev->uc_count == 0 && dev->uc_promisc) {
2946 __dev_set_promiscuity(dev, -1);
2947 dev->uc_promisc = 0;
2950 if (dev->set_multicast_list)
2951 dev->set_multicast_list(dev);
2955 void dev_set_rx_mode(struct net_device *dev)
2957 netif_tx_lock_bh(dev);
2958 __dev_set_rx_mode(dev);
2959 netif_tx_unlock_bh(dev);
2962 int __dev_addr_delete(struct dev_addr_list **list, int *count,
2963 void *addr, int alen, int glbl)
2965 struct dev_addr_list *da;
2967 for (; (da = *list) != NULL; list = &da->next) {
2968 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
2969 alen == da->da_addrlen) {
2971 int old_glbl = da->da_gusers;
2988 int __dev_addr_add(struct dev_addr_list **list, int *count,
2989 void *addr, int alen, int glbl)
2991 struct dev_addr_list *da;
2993 for (da = *list; da != NULL; da = da->next) {
2994 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
2995 da->da_addrlen == alen) {
2997 int old_glbl = da->da_gusers;
3007 da = kzalloc(sizeof(*da), GFP_ATOMIC);
3010 memcpy(da->da_addr, addr, alen);
3011 da->da_addrlen = alen;
3013 da->da_gusers = glbl ? 1 : 0;
3021 * dev_unicast_delete - Release secondary unicast address.
3023 * @addr: address to delete
3024 * @alen: length of @addr
3026 * Release reference to a secondary unicast address and remove it
3027 * from the device if the reference count drops to zero.
3029 * The caller must hold the rtnl_mutex.
3031 int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
3037 netif_tx_lock_bh(dev);
3038 err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3040 __dev_set_rx_mode(dev);
3041 netif_tx_unlock_bh(dev);
3044 EXPORT_SYMBOL(dev_unicast_delete);
3047 * dev_unicast_add - add a secondary unicast address
3049 * @addr: address to add
3050 * @alen: length of @addr
3052 * Add a secondary unicast address to the device or increase
3053 * the reference count if it already exists.
3055 * The caller must hold the rtnl_mutex.
3057 int dev_unicast_add(struct net_device *dev, void *addr, int alen)
3063 netif_tx_lock_bh(dev);
3064 err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3066 __dev_set_rx_mode(dev);
3067 netif_tx_unlock_bh(dev);
3070 EXPORT_SYMBOL(dev_unicast_add);
3072 int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
3073 struct dev_addr_list **from, int *from_count)
3075 struct dev_addr_list *da, *next;
3079 while (da != NULL) {
3081 if (!da->da_synced) {
3082 err = __dev_addr_add(to, to_count,
3083 da->da_addr, da->da_addrlen, 0);
3088 } else if (da->da_users == 1) {
3089 __dev_addr_delete(to, to_count,
3090 da->da_addr, da->da_addrlen, 0);
3091 __dev_addr_delete(from, from_count,
3092 da->da_addr, da->da_addrlen, 0);
3099 void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
3100 struct dev_addr_list **from, int *from_count)
3102 struct dev_addr_list *da, *next;
3105 while (da != NULL) {
3107 if (da->da_synced) {
3108 __dev_addr_delete(to, to_count,
3109 da->da_addr, da->da_addrlen, 0);
3111 __dev_addr_delete(from, from_count,
3112 da->da_addr, da->da_addrlen, 0);
3119 * dev_unicast_sync - Synchronize device's unicast list to another device
3120 * @to: destination device
3121 * @from: source device
3123 * Add newly added addresses to the destination device and release
3124 * addresses that have no users left. The source device must be
3125 * locked by netif_tx_lock_bh.
3127 * This function is intended to be called from the dev->set_rx_mode
3128 * function of layered software devices.
3130 int dev_unicast_sync(struct net_device *to, struct net_device *from)
3134 netif_tx_lock_bh(to);
3135 err = __dev_addr_sync(&to->uc_list, &to->uc_count,
3136 &from->uc_list, &from->uc_count);
3138 __dev_set_rx_mode(to);
3139 netif_tx_unlock_bh(to);
3142 EXPORT_SYMBOL(dev_unicast_sync);
3145 * dev_unicast_unsync - Remove synchronized addresses from the destination device
3146 * @to: destination device
3147 * @from: source device
3149 * Remove all addresses that were added to the destination device by
3150 * dev_unicast_sync(). This function is intended to be called from the
3151 * dev->stop function of layered software devices.
3153 void dev_unicast_unsync(struct net_device *to, struct net_device *from)
3155 netif_tx_lock_bh(from);
3156 netif_tx_lock_bh(to);
3158 __dev_addr_unsync(&to->uc_list, &to->uc_count,
3159 &from->uc_list, &from->uc_count);
3160 __dev_set_rx_mode(to);
3162 netif_tx_unlock_bh(to);
3163 netif_tx_unlock_bh(from);
3165 EXPORT_SYMBOL(dev_unicast_unsync);
3167 static void __dev_addr_discard(struct dev_addr_list **list)
3169 struct dev_addr_list *tmp;
3171 while (*list != NULL) {
3174 if (tmp->da_users > tmp->da_gusers)
3175 printk("__dev_addr_discard: address leakage! "
3176 "da_users=%d\n", tmp->da_users);
3181 static void dev_addr_discard(struct net_device *dev)
3183 netif_tx_lock_bh(dev);
3185 __dev_addr_discard(&dev->uc_list);
3188 __dev_addr_discard(&dev->mc_list);
3191 netif_tx_unlock_bh(dev);
3194 unsigned dev_get_flags(const struct net_device *dev)
3198 flags = (dev->flags & ~(IFF_PROMISC |
3203 (dev->gflags & (IFF_PROMISC |
3206 if (netif_running(dev)) {
3207 if (netif_oper_up(dev))
3208 flags |= IFF_RUNNING;
3209 if (netif_carrier_ok(dev))
3210 flags |= IFF_LOWER_UP;
3211 if (netif_dormant(dev))
3212 flags |= IFF_DORMANT;
3218 int dev_change_flags(struct net_device *dev, unsigned flags)
3221 int old_flags = dev->flags;
3226 * Set the flags on our device.
3229 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
3230 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
3232 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
3236 * Load in the correct multicast list now the flags have changed.
3239 if (dev->change_rx_flags && (old_flags ^ flags) & IFF_MULTICAST)
3240 dev->change_rx_flags(dev, IFF_MULTICAST);
3242 dev_set_rx_mode(dev);
3245 * Have we downed the interface. We handle IFF_UP ourselves
3246 * according to user attempts to set it, rather than blindly
3251 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
3252 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
3255 dev_set_rx_mode(dev);
3258 if (dev->flags & IFF_UP &&
3259 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
3261 call_netdevice_notifiers(NETDEV_CHANGE, dev);
3263 if ((flags ^ dev->gflags) & IFF_PROMISC) {
3264 int inc = (flags & IFF_PROMISC) ? +1 : -1;
3265 dev->gflags ^= IFF_PROMISC;
3266 dev_set_promiscuity(dev, inc);
3269 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
3270 is important. Some (broken) drivers set IFF_PROMISC, when
3271 IFF_ALLMULTI is requested not asking us and not reporting.
3273 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
3274 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
3275 dev->gflags ^= IFF_ALLMULTI;
3276 dev_set_allmulti(dev, inc);
3279 /* Exclude state transition flags, already notified */
3280 changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
3282 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
3287 int dev_set_mtu(struct net_device *dev, int new_mtu)
3291 if (new_mtu == dev->mtu)
3294 /* MTU must be positive. */
3298 if (!netif_device_present(dev))
3302 if (dev->change_mtu)
3303 err = dev->change_mtu(dev, new_mtu);
3306 if (!err && dev->flags & IFF_UP)
3307 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
3311 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
3315 if (!dev->set_mac_address)
3317 if (sa->sa_family != dev->type)
3319 if (!netif_device_present(dev))
3321 err = dev->set_mac_address(dev, sa);
3323 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3328 * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
3330 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
3333 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3339 case SIOCGIFFLAGS: /* Get interface flags */
3340 ifr->ifr_flags = dev_get_flags(dev);
3343 case SIOCGIFMETRIC: /* Get the metric on the interface
3344 (currently unused) */
3345 ifr->ifr_metric = 0;
3348 case SIOCGIFMTU: /* Get the MTU of a device */
3349 ifr->ifr_mtu = dev->mtu;
3354 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
3356 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
3357 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3358 ifr->ifr_hwaddr.sa_family = dev->type;
3366 ifr->ifr_map.mem_start = dev->mem_start;
3367 ifr->ifr_map.mem_end = dev->mem_end;
3368 ifr->ifr_map.base_addr = dev->base_addr;
3369 ifr->ifr_map.irq = dev->irq;
3370 ifr->ifr_map.dma = dev->dma;
3371 ifr->ifr_map.port = dev->if_port;
3375 ifr->ifr_ifindex = dev->ifindex;
3379 ifr->ifr_qlen = dev->tx_queue_len;
3383 /* dev_ioctl() should ensure this case
3395 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
3397 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
3400 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3406 case SIOCSIFFLAGS: /* Set interface flags */
3407 return dev_change_flags(dev, ifr->ifr_flags);
3409 case SIOCSIFMETRIC: /* Set the metric on the interface
3410 (currently unused) */
3413 case SIOCSIFMTU: /* Set the MTU of a device */
3414 return dev_set_mtu(dev, ifr->ifr_mtu);
3417 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
3419 case SIOCSIFHWBROADCAST:
3420 if (ifr->ifr_hwaddr.sa_family != dev->type)
3422 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
3423 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3424 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3428 if (dev->set_config) {
3429 if (!netif_device_present(dev))
3431 return dev->set_config(dev, &ifr->ifr_map);
3436 if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
3437 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3439 if (!netif_device_present(dev))
3441 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
3445 if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
3446 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3448 if (!netif_device_present(dev))
3450 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
3454 if (ifr->ifr_qlen < 0)
3456 dev->tx_queue_len = ifr->ifr_qlen;
3460 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
3461 return dev_change_name(dev, ifr->ifr_newname);
3464 * Unknown or private ioctl
3468 if ((cmd >= SIOCDEVPRIVATE &&
3469 cmd <= SIOCDEVPRIVATE + 15) ||
3470 cmd == SIOCBONDENSLAVE ||
3471 cmd == SIOCBONDRELEASE ||
3472 cmd == SIOCBONDSETHWADDR ||
3473 cmd == SIOCBONDSLAVEINFOQUERY ||
3474 cmd == SIOCBONDINFOQUERY ||
3475 cmd == SIOCBONDCHANGEACTIVE ||
3476 cmd == SIOCGMIIPHY ||
3477 cmd == SIOCGMIIREG ||
3478 cmd == SIOCSMIIREG ||
3479 cmd == SIOCBRADDIF ||
3480 cmd == SIOCBRDELIF ||
3481 cmd == SIOCWANDEV) {
3483 if (dev->do_ioctl) {
3484 if (netif_device_present(dev))
3485 err = dev->do_ioctl(dev, ifr,
3498 * This function handles all "interface"-type I/O control requests. The actual
3499 * 'doing' part of this is dev_ifsioc above.
3503 * dev_ioctl - network device ioctl
3504 * @net: the applicable net namespace
3505 * @cmd: command to issue
3506 * @arg: pointer to a struct ifreq in user space
3508 * Issue ioctl functions to devices. This is normally called by the
3509 * user space syscall interfaces but can sometimes be useful for
3510 * other purposes. The return value is the return from the syscall if
3511 * positive or a negative errno code on error.
3514 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
3520 /* One special case: SIOCGIFCONF takes ifconf argument
3521 and requires shared lock, because it sleeps writing
3525 if (cmd == SIOCGIFCONF) {
3527 ret = dev_ifconf(net, (char __user *) arg);
3531 if (cmd == SIOCGIFNAME)
3532 return dev_ifname(net, (struct ifreq __user *)arg);
3534 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3537 ifr.ifr_name[IFNAMSIZ-1] = 0;
3539 colon = strchr(ifr.ifr_name, ':');
3544 * See which interface the caller is talking about.
3549 * These ioctl calls:
3550 * - can be done by all.
3551 * - atomic and do not require locking.
3562 dev_load(net, ifr.ifr_name);
3563 read_lock(&dev_base_lock);
3564 ret = dev_ifsioc_locked(net, &ifr, cmd);
3565 read_unlock(&dev_base_lock);
3569 if (copy_to_user(arg, &ifr,
3570 sizeof(struct ifreq)))
3576 dev_load(net, ifr.ifr_name);
3578 ret = dev_ethtool(net, &ifr);
3583 if (copy_to_user(arg, &ifr,
3584 sizeof(struct ifreq)))
3590 * These ioctl calls:
3591 * - require superuser power.
3592 * - require strict serialization.
3598 if (!capable(CAP_NET_ADMIN))
3600 dev_load(net, ifr.ifr_name);
3602 ret = dev_ifsioc(net, &ifr, cmd);
3607 if (copy_to_user(arg, &ifr,
3608 sizeof(struct ifreq)))
3614 * These ioctl calls:
3615 * - require superuser power.
3616 * - require strict serialization.
3617 * - do not return a value
3627 case SIOCSIFHWBROADCAST:
3630 case SIOCBONDENSLAVE:
3631 case SIOCBONDRELEASE:
3632 case SIOCBONDSETHWADDR:
3633 case SIOCBONDCHANGEACTIVE:
3636 if (!capable(CAP_NET_ADMIN))
3639 case SIOCBONDSLAVEINFOQUERY:
3640 case SIOCBONDINFOQUERY:
3641 dev_load(net, ifr.ifr_name);
3643 ret = dev_ifsioc(net, &ifr, cmd);
3648 /* Get the per device memory space. We can add this but
3649 * currently do not support it */
3651 /* Set the per device memory buffer space.
3652 * Not applicable in our case */
3657 * Unknown or private ioctl.
3660 if (cmd == SIOCWANDEV ||
3661 (cmd >= SIOCDEVPRIVATE &&
3662 cmd <= SIOCDEVPRIVATE + 15)) {
3663 dev_load(net, ifr.ifr_name);
3665 ret = dev_ifsioc(net, &ifr, cmd);
3667 if (!ret && copy_to_user(arg, &ifr,
3668 sizeof(struct ifreq)))
3672 /* Take care of Wireless Extensions */
3673 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
3674 return wext_handle_ioctl(net, &ifr, cmd, arg);
3681 * dev_new_index - allocate an ifindex
3682 * @net: the applicable net namespace
3684 * Returns a suitable unique value for a new device interface
3685 * number. The caller must hold the rtnl semaphore or the
3686 * dev_base_lock to be sure it remains unique.
3688 static int dev_new_index(struct net *net)
3694 if (!__dev_get_by_index(net, ifindex))
3699 /* Delayed registration/unregisteration */
3700 static DEFINE_SPINLOCK(net_todo_list_lock);
3701 static LIST_HEAD(net_todo_list);
3703 static void net_set_todo(struct net_device *dev)
3705 spin_lock(&net_todo_list_lock);
3706 list_add_tail(&dev->todo_list, &net_todo_list);
3707 spin_unlock(&net_todo_list_lock);
3710 static void rollback_registered(struct net_device *dev)
3712 BUG_ON(dev_boot_phase);
3715 /* Some devices call without registering for initialization unwind. */
3716 if (dev->reg_state == NETREG_UNINITIALIZED) {
3717 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3718 "was registered\n", dev->name, dev);
3724 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3726 /* If device is running, close it first. */
3729 /* And unlink it from device chain. */
3730 unlist_netdevice(dev);
3732 dev->reg_state = NETREG_UNREGISTERING;
3736 /* Shutdown queueing discipline. */
3740 /* Notify protocols, that we are about to destroy
3741 this device. They should clean all the things.
3743 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
3746 * Flush the unicast and multicast chains
3748 dev_addr_discard(dev);
3753 /* Notifier chain MUST detach us from master device. */
3754 BUG_TRAP(!dev->master);
3756 /* Remove entries from kobject tree */
3757 netdev_unregister_kobject(dev);
3765 * register_netdevice - register a network device
3766 * @dev: device to register
3768 * Take a completed network device structure and add it to the kernel
3769 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3770 * chain. 0 is returned on success. A negative errno code is returned
3771 * on a failure to set up the device, or if the name is a duplicate.
3773 * Callers must hold the rtnl semaphore. You may want
3774 * register_netdev() instead of this.
3777 * The locking appears insufficient to guarantee two parallel registers
3778 * will not get the same name.
3781 int register_netdevice(struct net_device *dev)
3783 struct hlist_head *head;
3784 struct hlist_node *p;
3788 BUG_ON(dev_boot_phase);
3793 /* When net_device's are persistent, this will be fatal. */
3794 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
3795 BUG_ON(!dev_net(dev));
3798 spin_lock_init(&dev->_xmit_lock);
3799 netdev_set_lockdep_class(&dev->_xmit_lock, dev->type);
3800 dev->xmit_lock_owner = -1;
3804 /* Init, if this function is available */
3806 ret = dev->init(dev);
3814 if (!dev_valid_name(dev->name)) {
3819 dev->ifindex = dev_new_index(net);
3820 if (dev->iflink == -1)
3821 dev->iflink = dev->ifindex;
3823 /* Check for existence of name */
3824 head = dev_name_hash(net, dev->name);
3825 hlist_for_each(p, head) {
3826 struct net_device *d
3827 = hlist_entry(p, struct net_device, name_hlist);
3828 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
3834 /* Fix illegal checksum combinations */
3835 if ((dev->features & NETIF_F_HW_CSUM) &&
3836 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3837 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
3839 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
3842 if ((dev->features & NETIF_F_NO_CSUM) &&
3843 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3844 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
3846 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
3850 /* Fix illegal SG+CSUM combinations. */
3851 if ((dev->features & NETIF_F_SG) &&
3852 !(dev->features & NETIF_F_ALL_CSUM)) {
3853 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
3855 dev->features &= ~NETIF_F_SG;
3858 /* TSO requires that SG is present as well. */
3859 if ((dev->features & NETIF_F_TSO) &&
3860 !(dev->features & NETIF_F_SG)) {
3861 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
3863 dev->features &= ~NETIF_F_TSO;
3865 if (dev->features & NETIF_F_UFO) {
3866 if (!(dev->features & NETIF_F_HW_CSUM)) {
3867 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3868 "NETIF_F_HW_CSUM feature.\n",
3870 dev->features &= ~NETIF_F_UFO;
3872 if (!(dev->features & NETIF_F_SG)) {
3873 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3874 "NETIF_F_SG feature.\n",
3876 dev->features &= ~NETIF_F_UFO;
3880 netdev_initialize_kobject(dev);
3881 ret = netdev_register_kobject(dev);
3884 dev->reg_state = NETREG_REGISTERED;
3887 * Default initial state at registry is that the
3888 * device is present.
3891 set_bit(__LINK_STATE_PRESENT, &dev->state);
3893 dev_init_scheduler(dev);
3895 list_netdevice(dev);
3897 /* Notify protocols, that a new device appeared. */
3898 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
3899 ret = notifier_to_errno(ret);
3901 rollback_registered(dev);
3902 dev->reg_state = NETREG_UNREGISTERED;
3915 * register_netdev - register a network device
3916 * @dev: device to register
3918 * Take a completed network device structure and add it to the kernel
3919 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3920 * chain. 0 is returned on success. A negative errno code is returned
3921 * on a failure to set up the device, or if the name is a duplicate.
3923 * This is a wrapper around register_netdevice that takes the rtnl semaphore
3924 * and expands the device name if you passed a format string to
3927 int register_netdev(struct net_device *dev)
3934 * If the name is a format string the caller wants us to do a
3937 if (strchr(dev->name, '%')) {
3938 err = dev_alloc_name(dev, dev->name);
3943 err = register_netdevice(dev);
3948 EXPORT_SYMBOL(register_netdev);
3951 * netdev_wait_allrefs - wait until all references are gone.
3953 * This is called when unregistering network devices.
3955 * Any protocol or device that holds a reference should register
3956 * for netdevice notification, and cleanup and put back the
3957 * reference if they receive an UNREGISTER event.
3958 * We can get stuck here if buggy protocols don't correctly
3961 static void netdev_wait_allrefs(struct net_device *dev)
3963 unsigned long rebroadcast_time, warning_time;
3965 rebroadcast_time = warning_time = jiffies;
3966 while (atomic_read(&dev->refcnt) != 0) {
3967 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
3970 /* Rebroadcast unregister notification */
3971 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
3973 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
3975 /* We must not have linkwatch events
3976 * pending on unregister. If this
3977 * happens, we simply run the queue
3978 * unscheduled, resulting in a noop
3981 linkwatch_run_queue();
3986 rebroadcast_time = jiffies;
3991 if (time_after(jiffies, warning_time + 10 * HZ)) {
3992 printk(KERN_EMERG "unregister_netdevice: "
3993 "waiting for %s to become free. Usage "
3995 dev->name, atomic_read(&dev->refcnt));
3996 warning_time = jiffies;
4005 * register_netdevice(x1);
4006 * register_netdevice(x2);
4008 * unregister_netdevice(y1);
4009 * unregister_netdevice(y2);
4015 * We are invoked by rtnl_unlock() after it drops the semaphore.
4016 * This allows us to deal with problems:
4017 * 1) We can delete sysfs objects which invoke hotplug
4018 * without deadlocking with linkwatch via keventd.
4019 * 2) Since we run with the RTNL semaphore not held, we can sleep
4020 * safely in order to wait for the netdev refcnt to drop to zero.
4022 static DEFINE_MUTEX(net_todo_run_mutex);
4023 void netdev_run_todo(void)
4025 struct list_head list;
4027 /* Need to guard against multiple cpu's getting out of order. */
4028 mutex_lock(&net_todo_run_mutex);
4030 /* Not safe to do outside the semaphore. We must not return
4031 * until all unregister events invoked by the local processor
4032 * have been completed (either by this todo run, or one on
4035 if (list_empty(&net_todo_list))
4038 /* Snapshot list, allow later requests */
4039 spin_lock(&net_todo_list_lock);
4040 list_replace_init(&net_todo_list, &list);
4041 spin_unlock(&net_todo_list_lock);
4043 while (!list_empty(&list)) {
4044 struct net_device *dev
4045 = list_entry(list.next, struct net_device, todo_list);
4046 list_del(&dev->todo_list);
4048 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
4049 printk(KERN_ERR "network todo '%s' but state %d\n",
4050 dev->name, dev->reg_state);
4055 dev->reg_state = NETREG_UNREGISTERED;
4057 netdev_wait_allrefs(dev);
4060 BUG_ON(atomic_read(&dev->refcnt));
4061 BUG_TRAP(!dev->ip_ptr);
4062 BUG_TRAP(!dev->ip6_ptr);
4063 BUG_TRAP(!dev->dn_ptr);
4065 if (dev->destructor)
4066 dev->destructor(dev);
4068 /* Free network device */
4069 kobject_put(&dev->dev.kobj);
4073 mutex_unlock(&net_todo_run_mutex);
4076 static struct net_device_stats *internal_stats(struct net_device *dev)
4081 static void netdev_init_one_queue(struct net_device *dev,
4082 struct netdev_queue *queue)
4084 spin_lock_init(&queue->lock);
4088 static void netdev_init_queues(struct net_device *dev)
4090 netdev_init_one_queue(dev, &dev->rx_queue);
4091 netdev_init_one_queue(dev, &dev->tx_queue);
4095 * alloc_netdev_mq - allocate network device
4096 * @sizeof_priv: size of private data to allocate space for
4097 * @name: device name format string
4098 * @setup: callback to initialize device
4099 * @queue_count: the number of subqueues to allocate
4101 * Allocates a struct net_device with private data area for driver use
4102 * and performs basic initialization. Also allocates subquue structs
4103 * for each queue on the device at the end of the netdevice.
4105 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
4106 void (*setup)(struct net_device *), unsigned int queue_count)
4109 struct net_device *dev;
4112 BUG_ON(strlen(name) >= sizeof(dev->name));
4114 alloc_size = sizeof(struct net_device) +
4115 sizeof(struct net_device_subqueue) * (queue_count - 1);
4117 /* ensure 32-byte alignment of private area */
4118 alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
4119 alloc_size += sizeof_priv;
4121 /* ensure 32-byte alignment of whole construct */
4122 alloc_size += NETDEV_ALIGN_CONST;
4124 p = kzalloc(alloc_size, GFP_KERNEL);
4126 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
4130 dev = (struct net_device *)
4131 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4132 dev->padded = (char *)dev - (char *)p;
4133 dev_net_set(dev, &init_net);
4136 dev->priv = ((char *)dev +
4137 ((sizeof(struct net_device) +
4138 (sizeof(struct net_device_subqueue) *
4139 (queue_count - 1)) + NETDEV_ALIGN_CONST)
4140 & ~NETDEV_ALIGN_CONST));
4143 dev->egress_subqueue_count = queue_count;
4144 dev->gso_max_size = GSO_MAX_SIZE;
4146 netdev_init_queues(dev);
4148 dev->get_stats = internal_stats;
4149 netpoll_netdev_init(dev);
4151 strcpy(dev->name, name);
4154 EXPORT_SYMBOL(alloc_netdev_mq);
4157 * free_netdev - free network device
4160 * This function does the last stage of destroying an allocated device
4161 * interface. The reference to the device object is released.
4162 * If this is the last reference then it will be freed.
4164 void free_netdev(struct net_device *dev)
4166 release_net(dev_net(dev));
4168 /* Compatibility with error handling in drivers */
4169 if (dev->reg_state == NETREG_UNINITIALIZED) {
4170 kfree((char *)dev - dev->padded);
4174 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
4175 dev->reg_state = NETREG_RELEASED;
4177 /* will free via device release */
4178 put_device(&dev->dev);
4181 /* Synchronize with packet receive processing. */
4182 void synchronize_net(void)
4189 * unregister_netdevice - remove device from the kernel
4192 * This function shuts down a device interface and removes it
4193 * from the kernel tables.
4195 * Callers must hold the rtnl semaphore. You may want
4196 * unregister_netdev() instead of this.
4199 void unregister_netdevice(struct net_device *dev)
4203 rollback_registered(dev);
4204 /* Finish processing unregister after unlock */
4209 * unregister_netdev - remove device from the kernel
4212 * This function shuts down a device interface and removes it
4213 * from the kernel tables.
4215 * This is just a wrapper for unregister_netdevice that takes
4216 * the rtnl semaphore. In general you want to use this and not
4217 * unregister_netdevice.
4219 void unregister_netdev(struct net_device *dev)
4222 unregister_netdevice(dev);
4226 EXPORT_SYMBOL(unregister_netdev);
4229 * dev_change_net_namespace - move device to different nethost namespace
4231 * @net: network namespace
4232 * @pat: If not NULL name pattern to try if the current device name
4233 * is already taken in the destination network namespace.
4235 * This function shuts down a device interface and moves it
4236 * to a new network namespace. On success 0 is returned, on
4237 * a failure a netagive errno code is returned.
4239 * Callers must hold the rtnl semaphore.
4242 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
4245 const char *destname;
4250 /* Don't allow namespace local devices to be moved. */
4252 if (dev->features & NETIF_F_NETNS_LOCAL)
4255 /* Ensure the device has been registrered */
4257 if (dev->reg_state != NETREG_REGISTERED)
4260 /* Get out if there is nothing todo */
4262 if (net_eq(dev_net(dev), net))
4265 /* Pick the destination device name, and ensure
4266 * we can use it in the destination network namespace.
4269 destname = dev->name;
4270 if (__dev_get_by_name(net, destname)) {
4271 /* We get here if we can't use the current device name */
4274 if (!dev_valid_name(pat))
4276 if (strchr(pat, '%')) {
4277 if (__dev_alloc_name(net, pat, buf) < 0)
4282 if (__dev_get_by_name(net, destname))
4287 * And now a mini version of register_netdevice unregister_netdevice.
4290 /* If device is running close it first. */
4293 /* And unlink it from device chain */
4295 unlist_netdevice(dev);
4299 /* Shutdown queueing discipline. */
4302 /* Notify protocols, that we are about to destroy
4303 this device. They should clean all the things.
4305 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4308 * Flush the unicast and multicast chains
4310 dev_addr_discard(dev);
4312 /* Actually switch the network namespace */
4313 dev_net_set(dev, net);
4315 /* Assign the new device name */
4316 if (destname != dev->name)
4317 strcpy(dev->name, destname);
4319 /* If there is an ifindex conflict assign a new one */
4320 if (__dev_get_by_index(net, dev->ifindex)) {
4321 int iflink = (dev->iflink == dev->ifindex);
4322 dev->ifindex = dev_new_index(net);
4324 dev->iflink = dev->ifindex;
4327 /* Fixup kobjects */
4328 netdev_unregister_kobject(dev);
4329 err = netdev_register_kobject(dev);
4332 /* Add the device back in the hashes */
4333 list_netdevice(dev);
4335 /* Notify protocols, that a new device appeared. */
4336 call_netdevice_notifiers(NETDEV_REGISTER, dev);
4344 static int dev_cpu_callback(struct notifier_block *nfb,
4345 unsigned long action,
4348 struct sk_buff **list_skb;
4349 struct net_device **list_net;
4350 struct sk_buff *skb;
4351 unsigned int cpu, oldcpu = (unsigned long)ocpu;
4352 struct softnet_data *sd, *oldsd;
4354 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
4357 local_irq_disable();
4358 cpu = smp_processor_id();
4359 sd = &per_cpu(softnet_data, cpu);
4360 oldsd = &per_cpu(softnet_data, oldcpu);
4362 /* Find end of our completion_queue. */
4363 list_skb = &sd->completion_queue;
4365 list_skb = &(*list_skb)->next;
4366 /* Append completion queue from offline CPU. */
4367 *list_skb = oldsd->completion_queue;
4368 oldsd->completion_queue = NULL;
4370 /* Find end of our output_queue. */
4371 list_net = &sd->output_queue;
4373 list_net = &(*list_net)->next_sched;
4374 /* Append output queue from offline CPU. */
4375 *list_net = oldsd->output_queue;
4376 oldsd->output_queue = NULL;
4378 raise_softirq_irqoff(NET_TX_SOFTIRQ);
4381 /* Process offline CPU's input_pkt_queue */
4382 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
4388 #ifdef CONFIG_NET_DMA
4390 * net_dma_rebalance - try to maintain one DMA channel per CPU
4391 * @net_dma: DMA client and associated data (lock, channels, channel_mask)
4393 * This is called when the number of channels allocated to the net_dma client
4394 * changes. The net_dma client tries to have one DMA channel per CPU.
4397 static void net_dma_rebalance(struct net_dma *net_dma)
4399 unsigned int cpu, i, n, chan_idx;
4400 struct dma_chan *chan;
4402 if (cpus_empty(net_dma->channel_mask)) {
4403 for_each_online_cpu(cpu)
4404 rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
4409 cpu = first_cpu(cpu_online_map);
4411 for_each_cpu_mask(chan_idx, net_dma->channel_mask) {
4412 chan = net_dma->channels[chan_idx];
4414 n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask))
4415 + (i < (num_online_cpus() %
4416 cpus_weight(net_dma->channel_mask)) ? 1 : 0));
4419 per_cpu(softnet_data, cpu).net_dma = chan;
4420 cpu = next_cpu(cpu, cpu_online_map);
4428 * netdev_dma_event - event callback for the net_dma_client
4429 * @client: should always be net_dma_client
4430 * @chan: DMA channel for the event
4431 * @state: DMA state to be handled
4433 static enum dma_state_client
4434 netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
4435 enum dma_state state)
4437 int i, found = 0, pos = -1;
4438 struct net_dma *net_dma =
4439 container_of(client, struct net_dma, client);
4440 enum dma_state_client ack = DMA_DUP; /* default: take no action */
4442 spin_lock(&net_dma->lock);
4444 case DMA_RESOURCE_AVAILABLE:
4445 for (i = 0; i < nr_cpu_ids; i++)
4446 if (net_dma->channels[i] == chan) {
4449 } else if (net_dma->channels[i] == NULL && pos < 0)
4452 if (!found && pos >= 0) {
4454 net_dma->channels[pos] = chan;
4455 cpu_set(pos, net_dma->channel_mask);
4456 net_dma_rebalance(net_dma);
4459 case DMA_RESOURCE_REMOVED:
4460 for (i = 0; i < nr_cpu_ids; i++)
4461 if (net_dma->channels[i] == chan) {
4469 cpu_clear(pos, net_dma->channel_mask);
4470 net_dma->channels[i] = NULL;
4471 net_dma_rebalance(net_dma);
4477 spin_unlock(&net_dma->lock);
4483 * netdev_dma_regiser - register the networking subsystem as a DMA client
4485 static int __init netdev_dma_register(void)
4487 net_dma.channels = kzalloc(nr_cpu_ids * sizeof(struct net_dma),
4489 if (unlikely(!net_dma.channels)) {
4491 "netdev_dma: no memory for net_dma.channels\n");
4494 spin_lock_init(&net_dma.lock);
4495 dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask);
4496 dma_async_client_register(&net_dma.client);
4497 dma_async_client_chan_request(&net_dma.client);
4502 static int __init netdev_dma_register(void) { return -ENODEV; }
4503 #endif /* CONFIG_NET_DMA */
4506 * netdev_compute_feature - compute conjunction of two feature sets
4507 * @all: first feature set
4508 * @one: second feature set
4510 * Computes a new feature set after adding a device with feature set
4511 * @one to the master device with current feature set @all. Returns
4512 * the new feature set.
4514 int netdev_compute_features(unsigned long all, unsigned long one)
4516 /* if device needs checksumming, downgrade to hw checksumming */
4517 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
4518 all ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
4520 /* if device can't do all checksum, downgrade to ipv4/ipv6 */
4521 if (all & NETIF_F_HW_CSUM && !(one & NETIF_F_HW_CSUM))
4522 all ^= NETIF_F_HW_CSUM
4523 | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
4525 if (one & NETIF_F_GSO)
4526 one |= NETIF_F_GSO_SOFTWARE;
4529 /* If even one device supports robust GSO, enable it for all. */
4530 if (one & NETIF_F_GSO_ROBUST)
4531 all |= NETIF_F_GSO_ROBUST;
4533 all &= one | NETIF_F_LLTX;
4535 if (!(all & NETIF_F_ALL_CSUM))
4537 if (!(all & NETIF_F_SG))
4538 all &= ~NETIF_F_GSO_MASK;
4542 EXPORT_SYMBOL(netdev_compute_features);
4544 static struct hlist_head *netdev_create_hash(void)
4547 struct hlist_head *hash;
4549 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
4551 for (i = 0; i < NETDEV_HASHENTRIES; i++)
4552 INIT_HLIST_HEAD(&hash[i]);
4557 /* Initialize per network namespace state */
4558 static int __net_init netdev_init(struct net *net)
4560 INIT_LIST_HEAD(&net->dev_base_head);
4562 net->dev_name_head = netdev_create_hash();
4563 if (net->dev_name_head == NULL)
4566 net->dev_index_head = netdev_create_hash();
4567 if (net->dev_index_head == NULL)
4573 kfree(net->dev_name_head);
4578 static void __net_exit netdev_exit(struct net *net)
4580 kfree(net->dev_name_head);
4581 kfree(net->dev_index_head);
4584 static struct pernet_operations __net_initdata netdev_net_ops = {
4585 .init = netdev_init,
4586 .exit = netdev_exit,
4589 static void __net_exit default_device_exit(struct net *net)
4591 struct net_device *dev, *next;
4593 * Push all migratable of the network devices back to the
4594 * initial network namespace
4597 for_each_netdev_safe(net, dev, next) {
4599 char fb_name[IFNAMSIZ];
4601 /* Ignore unmoveable devices (i.e. loopback) */
4602 if (dev->features & NETIF_F_NETNS_LOCAL)
4605 /* Push remaing network devices to init_net */
4606 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
4607 err = dev_change_net_namespace(dev, &init_net, fb_name);
4609 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
4610 __func__, dev->name, err);
4617 static struct pernet_operations __net_initdata default_device_ops = {
4618 .exit = default_device_exit,
4622 * Initialize the DEV module. At boot time this walks the device list and
4623 * unhooks any devices that fail to initialise (normally hardware not
4624 * present) and leaves us with a valid list of present and active devices.
4629 * This is called single threaded during boot, so no need
4630 * to take the rtnl semaphore.
4632 static int __init net_dev_init(void)
4634 int i, rc = -ENOMEM;
4636 BUG_ON(!dev_boot_phase);
4638 if (dev_proc_init())
4641 if (netdev_kobject_init())
4644 INIT_LIST_HEAD(&ptype_all);
4645 for (i = 0; i < PTYPE_HASH_SIZE; i++)
4646 INIT_LIST_HEAD(&ptype_base[i]);
4648 if (register_pernet_subsys(&netdev_net_ops))
4651 if (register_pernet_device(&default_device_ops))
4655 * Initialise the packet receive queues.
4658 for_each_possible_cpu(i) {
4659 struct softnet_data *queue;
4661 queue = &per_cpu(softnet_data, i);
4662 skb_queue_head_init(&queue->input_pkt_queue);
4663 queue->completion_queue = NULL;
4664 INIT_LIST_HEAD(&queue->poll_list);
4666 queue->backlog.poll = process_backlog;
4667 queue->backlog.weight = weight_p;
4670 netdev_dma_register();
4674 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
4675 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
4677 hotcpu_notifier(dev_cpu_callback, 0);
4685 subsys_initcall(net_dev_init);
4687 EXPORT_SYMBOL(__dev_get_by_index);
4688 EXPORT_SYMBOL(__dev_get_by_name);
4689 EXPORT_SYMBOL(__dev_remove_pack);
4690 EXPORT_SYMBOL(dev_valid_name);
4691 EXPORT_SYMBOL(dev_add_pack);
4692 EXPORT_SYMBOL(dev_alloc_name);
4693 EXPORT_SYMBOL(dev_close);
4694 EXPORT_SYMBOL(dev_get_by_flags);
4695 EXPORT_SYMBOL(dev_get_by_index);
4696 EXPORT_SYMBOL(dev_get_by_name);
4697 EXPORT_SYMBOL(dev_open);
4698 EXPORT_SYMBOL(dev_queue_xmit);
4699 EXPORT_SYMBOL(dev_remove_pack);
4700 EXPORT_SYMBOL(dev_set_allmulti);
4701 EXPORT_SYMBOL(dev_set_promiscuity);
4702 EXPORT_SYMBOL(dev_change_flags);
4703 EXPORT_SYMBOL(dev_set_mtu);
4704 EXPORT_SYMBOL(dev_set_mac_address);
4705 EXPORT_SYMBOL(free_netdev);
4706 EXPORT_SYMBOL(netdev_boot_setup_check);
4707 EXPORT_SYMBOL(netdev_set_master);
4708 EXPORT_SYMBOL(netdev_state_change);
4709 EXPORT_SYMBOL(netif_receive_skb);
4710 EXPORT_SYMBOL(netif_rx);
4711 EXPORT_SYMBOL(register_gifconf);
4712 EXPORT_SYMBOL(register_netdevice);
4713 EXPORT_SYMBOL(register_netdevice_notifier);
4714 EXPORT_SYMBOL(skb_checksum_help);
4715 EXPORT_SYMBOL(synchronize_net);
4716 EXPORT_SYMBOL(unregister_netdevice);
4717 EXPORT_SYMBOL(unregister_netdevice_notifier);
4718 EXPORT_SYMBOL(net_enable_timestamp);
4719 EXPORT_SYMBOL(net_disable_timestamp);
4720 EXPORT_SYMBOL(dev_get_flags);
4722 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
4723 EXPORT_SYMBOL(br_handle_frame_hook);
4724 EXPORT_SYMBOL(br_fdb_get_hook);
4725 EXPORT_SYMBOL(br_fdb_put_hook);
4729 EXPORT_SYMBOL(dev_load);
4732 EXPORT_PER_CPU_SYMBOL(softnet_data);