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/notifier.h>
94 #include <linux/skbuff.h>
96 #include <linux/rtnetlink.h>
97 #include <linux/proc_fs.h>
98 #include <linux/seq_file.h>
99 #include <linux/stat.h>
100 #include <linux/if_bridge.h>
102 #include <net/pkt_sched.h>
103 #include <net/checksum.h>
104 #include <linux/highmem.h>
105 #include <linux/init.h>
106 #include <linux/kmod.h>
107 #include <linux/module.h>
108 #include <linux/kallsyms.h>
109 #include <linux/netpoll.h>
110 #include <linux/rcupdate.h>
111 #include <linux/delay.h>
112 #include <net/wext.h>
113 #include <net/iw_handler.h>
114 #include <asm/current.h>
115 #include <linux/audit.h>
116 #include <linux/dmaengine.h>
117 #include <linux/err.h>
118 #include <linux/ctype.h>
119 #include <linux/if_arp.h>
122 * The list of packet types we will receive (as opposed to discard)
123 * and the routines to invoke.
125 * Why 16. Because with 16 the only overlap we get on a hash of the
126 * low nibble of the protocol value is RARP/SNAP/X.25.
128 * NOTE: That is no longer true with the addition of VLAN tags. Not
129 * sure which should go first, but I bet it won't make much
130 * difference if we are running VLANs. The good news is that
131 * this protocol won't be in the list unless compiled in, so
132 * the average user (w/out VLANs) will not be adversely affected.
149 static DEFINE_SPINLOCK(ptype_lock);
150 static struct list_head ptype_base[16] __read_mostly; /* 16 way hashed list */
151 static struct list_head ptype_all __read_mostly; /* Taps */
153 #ifdef CONFIG_NET_DMA
154 static struct dma_client *net_dma_client;
155 static unsigned int net_dma_count;
156 static spinlock_t net_dma_event_lock;
160 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
163 * Pure readers hold dev_base_lock for reading.
165 * Writers must hold the rtnl semaphore while they loop through the
166 * dev_base_head list, and hold dev_base_lock for writing when they do the
167 * actual updates. This allows pure readers to access the list even
168 * while a writer is preparing to update it.
170 * To put it another way, dev_base_lock is held for writing only to
171 * protect against pure readers; the rtnl semaphore provides the
172 * protection against other writers.
174 * See, for example usages, register_netdevice() and
175 * unregister_netdevice(), which must be called with the rtnl
178 LIST_HEAD(dev_base_head);
179 DEFINE_RWLOCK(dev_base_lock);
181 EXPORT_SYMBOL(dev_base_head);
182 EXPORT_SYMBOL(dev_base_lock);
184 #define NETDEV_HASHBITS 8
185 static struct hlist_head dev_name_head[1<<NETDEV_HASHBITS];
186 static struct hlist_head dev_index_head[1<<NETDEV_HASHBITS];
188 static inline struct hlist_head *dev_name_hash(const char *name)
190 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
191 return &dev_name_head[hash & ((1<<NETDEV_HASHBITS)-1)];
194 static inline struct hlist_head *dev_index_hash(int ifindex)
196 return &dev_index_head[ifindex & ((1<<NETDEV_HASHBITS)-1)];
203 static RAW_NOTIFIER_HEAD(netdev_chain);
206 * Device drivers call our routines to queue packets here. We empty the
207 * queue in the local softnet handler.
209 DEFINE_PER_CPU(struct softnet_data, softnet_data) = { NULL };
212 extern int netdev_sysfs_init(void);
213 extern int netdev_register_sysfs(struct net_device *);
214 extern void netdev_unregister_sysfs(struct net_device *);
216 #define netdev_sysfs_init() (0)
217 #define netdev_register_sysfs(dev) (0)
218 #define netdev_unregister_sysfs(dev) do { } while(0)
221 #ifdef CONFIG_DEBUG_LOCK_ALLOC
223 * register_netdevice() inits dev->_xmit_lock and sets lockdep class
224 * according to dev->type
226 static const unsigned short netdev_lock_type[] =
227 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
228 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
229 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
230 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
231 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
232 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
233 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
234 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
235 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
236 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
237 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
238 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
239 ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211,
240 ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_VOID,
243 static const char *netdev_lock_name[] =
244 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
245 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
246 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
247 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
248 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
249 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
250 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
251 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
252 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
253 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
254 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
255 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
256 "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211",
257 "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_VOID",
260 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
262 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
266 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
267 if (netdev_lock_type[i] == dev_type)
269 /* the last key is used by default */
270 return ARRAY_SIZE(netdev_lock_type) - 1;
273 static inline void netdev_set_lockdep_class(spinlock_t *lock,
274 unsigned short dev_type)
278 i = netdev_lock_pos(dev_type);
279 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
280 netdev_lock_name[i]);
283 static inline void netdev_set_lockdep_class(spinlock_t *lock,
284 unsigned short dev_type)
289 /*******************************************************************************
291 Protocol management and registration routines
293 *******************************************************************************/
296 * Add a protocol ID to the list. Now that the input handler is
297 * smarter we can dispense with all the messy stuff that used to be
300 * BEWARE!!! Protocol handlers, mangling input packets,
301 * MUST BE last in hash buckets and checking protocol handlers
302 * MUST start from promiscuous ptype_all chain in net_bh.
303 * It is true now, do not change it.
304 * Explanation follows: if protocol handler, mangling packet, will
305 * be the first on list, it is not able to sense, that packet
306 * is cloned and should be copied-on-write, so that it will
307 * change it and subsequent readers will get broken packet.
312 * dev_add_pack - add packet handler
313 * @pt: packet type declaration
315 * Add a protocol handler to the networking stack. The passed &packet_type
316 * is linked into kernel lists and may not be freed until it has been
317 * removed from the kernel lists.
319 * This call does not sleep therefore it can not
320 * guarantee all CPU's that are in middle of receiving packets
321 * will see the new packet type (until the next received packet).
324 void dev_add_pack(struct packet_type *pt)
328 spin_lock_bh(&ptype_lock);
329 if (pt->type == htons(ETH_P_ALL))
330 list_add_rcu(&pt->list, &ptype_all);
332 hash = ntohs(pt->type) & 15;
333 list_add_rcu(&pt->list, &ptype_base[hash]);
335 spin_unlock_bh(&ptype_lock);
339 * __dev_remove_pack - remove packet handler
340 * @pt: packet type declaration
342 * Remove a protocol handler that was previously added to the kernel
343 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
344 * from the kernel lists and can be freed or reused once this function
347 * The packet type might still be in use by receivers
348 * and must not be freed until after all the CPU's have gone
349 * through a quiescent state.
351 void __dev_remove_pack(struct packet_type *pt)
353 struct list_head *head;
354 struct packet_type *pt1;
356 spin_lock_bh(&ptype_lock);
358 if (pt->type == htons(ETH_P_ALL))
361 head = &ptype_base[ntohs(pt->type) & 15];
363 list_for_each_entry(pt1, head, list) {
365 list_del_rcu(&pt->list);
370 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
372 spin_unlock_bh(&ptype_lock);
375 * dev_remove_pack - remove packet handler
376 * @pt: packet type declaration
378 * Remove a protocol handler that was previously added to the kernel
379 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
380 * from the kernel lists and can be freed or reused once this function
383 * This call sleeps to guarantee that no CPU is looking at the packet
386 void dev_remove_pack(struct packet_type *pt)
388 __dev_remove_pack(pt);
393 /******************************************************************************
395 Device Boot-time Settings Routines
397 *******************************************************************************/
399 /* Boot time configuration table */
400 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
403 * netdev_boot_setup_add - add new setup entry
404 * @name: name of the device
405 * @map: configured settings for the device
407 * Adds new setup entry to the dev_boot_setup list. The function
408 * returns 0 on error and 1 on success. This is a generic routine to
411 static int netdev_boot_setup_add(char *name, struct ifmap *map)
413 struct netdev_boot_setup *s;
417 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
418 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
419 memset(s[i].name, 0, sizeof(s[i].name));
420 strcpy(s[i].name, name);
421 memcpy(&s[i].map, map, sizeof(s[i].map));
426 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
430 * netdev_boot_setup_check - check boot time settings
431 * @dev: the netdevice
433 * Check boot time settings for the device.
434 * The found settings are set for the device to be used
435 * later in the device probing.
436 * Returns 0 if no settings found, 1 if they are.
438 int netdev_boot_setup_check(struct net_device *dev)
440 struct netdev_boot_setup *s = dev_boot_setup;
443 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
444 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
445 !strncmp(dev->name, s[i].name, strlen(s[i].name))) {
446 dev->irq = s[i].map.irq;
447 dev->base_addr = s[i].map.base_addr;
448 dev->mem_start = s[i].map.mem_start;
449 dev->mem_end = s[i].map.mem_end;
458 * netdev_boot_base - get address from boot time settings
459 * @prefix: prefix for network device
460 * @unit: id for network device
462 * Check boot time settings for the base address of device.
463 * The found settings are set for the device to be used
464 * later in the device probing.
465 * Returns 0 if no settings found.
467 unsigned long netdev_boot_base(const char *prefix, int unit)
469 const struct netdev_boot_setup *s = dev_boot_setup;
473 sprintf(name, "%s%d", prefix, unit);
476 * If device already registered then return base of 1
477 * to indicate not to probe for this interface
479 if (__dev_get_by_name(name))
482 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
483 if (!strcmp(name, s[i].name))
484 return s[i].map.base_addr;
489 * Saves at boot time configured settings for any netdevice.
491 int __init netdev_boot_setup(char *str)
496 str = get_options(str, ARRAY_SIZE(ints), ints);
501 memset(&map, 0, sizeof(map));
505 map.base_addr = ints[2];
507 map.mem_start = ints[3];
509 map.mem_end = ints[4];
511 /* Add new entry to the list */
512 return netdev_boot_setup_add(str, &map);
515 __setup("netdev=", netdev_boot_setup);
517 /*******************************************************************************
519 Device Interface Subroutines
521 *******************************************************************************/
524 * __dev_get_by_name - find a device by its name
525 * @name: name to find
527 * Find an interface by name. Must be called under RTNL semaphore
528 * or @dev_base_lock. If the name is found a pointer to the device
529 * is returned. If the name is not found then %NULL is returned. The
530 * reference counters are not incremented so the caller must be
531 * careful with locks.
534 struct net_device *__dev_get_by_name(const char *name)
536 struct hlist_node *p;
538 hlist_for_each(p, dev_name_hash(name)) {
539 struct net_device *dev
540 = hlist_entry(p, struct net_device, name_hlist);
541 if (!strncmp(dev->name, name, IFNAMSIZ))
548 * dev_get_by_name - find a device by its name
549 * @name: name to find
551 * Find an interface by name. This can be called from any
552 * context and does its own locking. The returned handle has
553 * the usage count incremented and the caller must use dev_put() to
554 * release it when it is no longer needed. %NULL is returned if no
555 * matching device is found.
558 struct net_device *dev_get_by_name(const char *name)
560 struct net_device *dev;
562 read_lock(&dev_base_lock);
563 dev = __dev_get_by_name(name);
566 read_unlock(&dev_base_lock);
571 * __dev_get_by_index - find a device by its ifindex
572 * @ifindex: index of device
574 * Search for an interface by index. Returns %NULL if the device
575 * is not found or a pointer to the device. The device has not
576 * had its reference counter increased so the caller must be careful
577 * about locking. The caller must hold either the RTNL semaphore
581 struct net_device *__dev_get_by_index(int ifindex)
583 struct hlist_node *p;
585 hlist_for_each(p, dev_index_hash(ifindex)) {
586 struct net_device *dev
587 = hlist_entry(p, struct net_device, index_hlist);
588 if (dev->ifindex == ifindex)
596 * dev_get_by_index - find a device by its ifindex
597 * @ifindex: index of device
599 * Search for an interface by index. Returns NULL if the device
600 * is not found or a pointer to the device. The device returned has
601 * had a reference added and the pointer is safe until the user calls
602 * dev_put to indicate they have finished with it.
605 struct net_device *dev_get_by_index(int ifindex)
607 struct net_device *dev;
609 read_lock(&dev_base_lock);
610 dev = __dev_get_by_index(ifindex);
613 read_unlock(&dev_base_lock);
618 * dev_getbyhwaddr - find a device by its hardware address
619 * @type: media type of device
620 * @ha: hardware address
622 * Search for an interface by MAC address. Returns NULL if the device
623 * is not found or a pointer to the device. The caller must hold the
624 * rtnl semaphore. The returned device has not had its ref count increased
625 * and the caller must therefore be careful about locking
628 * If the API was consistent this would be __dev_get_by_hwaddr
631 struct net_device *dev_getbyhwaddr(unsigned short type, char *ha)
633 struct net_device *dev;
638 if (dev->type == type &&
639 !memcmp(dev->dev_addr, ha, dev->addr_len))
645 EXPORT_SYMBOL(dev_getbyhwaddr);
647 struct net_device *__dev_getfirstbyhwtype(unsigned short type)
649 struct net_device *dev;
653 if (dev->type == type)
659 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
661 struct net_device *dev_getfirstbyhwtype(unsigned short type)
663 struct net_device *dev;
666 dev = __dev_getfirstbyhwtype(type);
673 EXPORT_SYMBOL(dev_getfirstbyhwtype);
676 * dev_get_by_flags - find any device with given flags
677 * @if_flags: IFF_* values
678 * @mask: bitmask of bits in if_flags to check
680 * Search for any interface with the given flags. Returns NULL if a device
681 * is not found or a pointer to the device. The device returned has
682 * had a reference added and the pointer is safe until the user calls
683 * dev_put to indicate they have finished with it.
686 struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mask)
688 struct net_device *dev, *ret;
691 read_lock(&dev_base_lock);
692 for_each_netdev(dev) {
693 if (((dev->flags ^ if_flags) & mask) == 0) {
699 read_unlock(&dev_base_lock);
704 * dev_valid_name - check if name is okay for network device
707 * Network device names need to be valid file names to
708 * to allow sysfs to work. We also disallow any kind of
711 int dev_valid_name(const char *name)
715 if (strlen(name) >= IFNAMSIZ)
717 if (!strcmp(name, ".") || !strcmp(name, ".."))
721 if (*name == '/' || isspace(*name))
729 * dev_alloc_name - allocate a name for a device
731 * @name: name format string
733 * Passed a format string - eg "lt%d" it will try and find a suitable
734 * id. It scans list of devices to build up a free map, then chooses
735 * the first empty slot. The caller must hold the dev_base or rtnl lock
736 * while allocating the name and adding the device in order to avoid
738 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
739 * Returns the number of the unit assigned or a negative errno code.
742 int dev_alloc_name(struct net_device *dev, const char *name)
747 const int max_netdevices = 8*PAGE_SIZE;
749 struct net_device *d;
751 p = strnchr(name, IFNAMSIZ-1, '%');
754 * Verify the string as this thing may have come from
755 * the user. There must be either one "%d" and no other "%"
758 if (p[1] != 'd' || strchr(p + 2, '%'))
761 /* Use one page as a bit array of possible slots */
762 inuse = (long *) get_zeroed_page(GFP_ATOMIC);
767 if (!sscanf(d->name, name, &i))
769 if (i < 0 || i >= max_netdevices)
772 /* avoid cases where sscanf is not exact inverse of printf */
773 snprintf(buf, sizeof(buf), name, i);
774 if (!strncmp(buf, d->name, IFNAMSIZ))
778 i = find_first_zero_bit(inuse, max_netdevices);
779 free_page((unsigned long) inuse);
782 snprintf(buf, sizeof(buf), name, i);
783 if (!__dev_get_by_name(buf)) {
784 strlcpy(dev->name, buf, IFNAMSIZ);
788 /* It is possible to run out of possible slots
789 * when the name is long and there isn't enough space left
790 * for the digits, or if all bits are used.
797 * dev_change_name - change name of a device
799 * @newname: name (or format string) must be at least IFNAMSIZ
801 * Change name of a device, can pass format strings "eth%d".
804 int dev_change_name(struct net_device *dev, char *newname)
810 if (dev->flags & IFF_UP)
813 if (!dev_valid_name(newname))
816 if (strchr(newname, '%')) {
817 err = dev_alloc_name(dev, newname);
820 strcpy(newname, dev->name);
822 else if (__dev_get_by_name(newname))
825 strlcpy(dev->name, newname, IFNAMSIZ);
827 device_rename(&dev->dev, dev->name);
828 hlist_del(&dev->name_hlist);
829 hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name));
830 raw_notifier_call_chain(&netdev_chain, NETDEV_CHANGENAME, dev);
836 * netdev_features_change - device changes features
837 * @dev: device to cause notification
839 * Called to indicate a device has changed features.
841 void netdev_features_change(struct net_device *dev)
843 raw_notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
845 EXPORT_SYMBOL(netdev_features_change);
848 * netdev_state_change - device changes state
849 * @dev: device to cause notification
851 * Called to indicate a device has changed state. This function calls
852 * the notifier chains for netdev_chain and sends a NEWLINK message
853 * to the routing socket.
855 void netdev_state_change(struct net_device *dev)
857 if (dev->flags & IFF_UP) {
858 raw_notifier_call_chain(&netdev_chain,
860 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
865 * dev_load - load a network module
866 * @name: name of interface
868 * If a network interface is not present and the process has suitable
869 * privileges this function loads the module. If module loading is not
870 * available in this kernel then it becomes a nop.
873 void dev_load(const char *name)
875 struct net_device *dev;
877 read_lock(&dev_base_lock);
878 dev = __dev_get_by_name(name);
879 read_unlock(&dev_base_lock);
881 if (!dev && capable(CAP_SYS_MODULE))
882 request_module("%s", name);
885 static int default_rebuild_header(struct sk_buff *skb)
887 printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
888 skb->dev ? skb->dev->name : "NULL!!!");
894 * dev_open - prepare an interface for use.
895 * @dev: device to open
897 * Takes a device from down to up state. The device's private open
898 * function is invoked and then the multicast lists are loaded. Finally
899 * the device is moved into the up state and a %NETDEV_UP message is
900 * sent to the netdev notifier chain.
902 * Calling this function on an active interface is a nop. On a failure
903 * a negative errno code is returned.
905 int dev_open(struct net_device *dev)
913 if (dev->flags & IFF_UP)
917 * Is it even present?
919 if (!netif_device_present(dev))
923 * Call device private open method
925 set_bit(__LINK_STATE_START, &dev->state);
927 ret = dev->open(dev);
929 clear_bit(__LINK_STATE_START, &dev->state);
933 * If it went open OK then:
940 dev->flags |= IFF_UP;
943 * Initialize multicasting status
948 * Wakeup transmit queue engine
953 * ... and announce new interface.
955 raw_notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
961 * dev_close - shutdown an interface.
962 * @dev: device to shutdown
964 * This function moves an active device into down state. A
965 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
966 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
969 int dev_close(struct net_device *dev)
971 if (!(dev->flags & IFF_UP))
975 * Tell people we are going down, so that they can
976 * prepare to death, when device is still operating.
978 raw_notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
982 clear_bit(__LINK_STATE_START, &dev->state);
984 /* Synchronize to scheduled poll. We cannot touch poll list,
985 * it can be even on different cpu. So just clear netif_running(),
986 * and wait when poll really will happen. Actually, the best place
987 * for this is inside dev->stop() after device stopped its irq
988 * engine, but this requires more changes in devices. */
990 smp_mb__after_clear_bit(); /* Commit netif_running(). */
991 while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
997 * Call the device specific close. This cannot fail.
998 * Only if device is UP
1000 * We allow it to be called even after a DETACH hot-plug
1007 * Device is now down.
1010 dev->flags &= ~IFF_UP;
1013 * Tell people we are down
1015 raw_notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
1022 * Device change register/unregister. These are not inline or static
1023 * as we export them to the world.
1027 * register_netdevice_notifier - register a network notifier block
1030 * Register a notifier to be called when network device events occur.
1031 * The notifier passed is linked into the kernel structures and must
1032 * not be reused until it has been unregistered. A negative errno code
1033 * is returned on a failure.
1035 * When registered all registration and up events are replayed
1036 * to the new notifier to allow device to have a race free
1037 * view of the network device list.
1040 int register_netdevice_notifier(struct notifier_block *nb)
1042 struct net_device *dev;
1046 err = raw_notifier_chain_register(&netdev_chain, nb);
1048 for_each_netdev(dev) {
1049 nb->notifier_call(nb, NETDEV_REGISTER, dev);
1051 if (dev->flags & IFF_UP)
1052 nb->notifier_call(nb, NETDEV_UP, dev);
1060 * unregister_netdevice_notifier - unregister a network notifier block
1063 * Unregister a notifier previously registered by
1064 * register_netdevice_notifier(). The notifier is unlinked into the
1065 * kernel structures and may then be reused. A negative errno code
1066 * is returned on a failure.
1069 int unregister_netdevice_notifier(struct notifier_block *nb)
1074 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1080 * call_netdevice_notifiers - call all network notifier blocks
1081 * @val: value passed unmodified to notifier function
1082 * @v: pointer passed unmodified to notifier function
1084 * Call all network notifier blocks. Parameters and return value
1085 * are as for raw_notifier_call_chain().
1088 int call_netdevice_notifiers(unsigned long val, void *v)
1090 return raw_notifier_call_chain(&netdev_chain, val, v);
1093 /* When > 0 there are consumers of rx skb time stamps */
1094 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1096 void net_enable_timestamp(void)
1098 atomic_inc(&netstamp_needed);
1101 void net_disable_timestamp(void)
1103 atomic_dec(&netstamp_needed);
1106 static inline void net_timestamp(struct sk_buff *skb)
1108 if (atomic_read(&netstamp_needed))
1109 __net_timestamp(skb);
1111 skb->tstamp.tv64 = 0;
1115 * Support routine. Sends outgoing frames to any network
1116 * taps currently in use.
1119 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1121 struct packet_type *ptype;
1126 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1127 /* Never send packets back to the socket
1128 * they originated from - MvS (miquels@drinkel.ow.org)
1130 if ((ptype->dev == dev || !ptype->dev) &&
1131 (ptype->af_packet_priv == NULL ||
1132 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1133 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1137 /* skb->nh should be correctly
1138 set by sender, so that the second statement is
1139 just protection against buggy protocols.
1141 skb_reset_mac_header(skb2);
1143 if (skb_network_header(skb2) < skb2->data ||
1144 skb2->network_header > skb2->tail) {
1145 if (net_ratelimit())
1146 printk(KERN_CRIT "protocol %04x is "
1148 skb2->protocol, dev->name);
1149 skb_reset_network_header(skb2);
1152 skb2->transport_header = skb2->network_header;
1153 skb2->pkt_type = PACKET_OUTGOING;
1154 ptype->func(skb2, skb->dev, ptype, skb->dev);
1161 void __netif_schedule(struct net_device *dev)
1163 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
1164 unsigned long flags;
1165 struct softnet_data *sd;
1167 local_irq_save(flags);
1168 sd = &__get_cpu_var(softnet_data);
1169 dev->next_sched = sd->output_queue;
1170 sd->output_queue = dev;
1171 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1172 local_irq_restore(flags);
1175 EXPORT_SYMBOL(__netif_schedule);
1177 void __netif_rx_schedule(struct net_device *dev)
1179 unsigned long flags;
1181 local_irq_save(flags);
1183 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
1185 dev->quota += dev->weight;
1187 dev->quota = dev->weight;
1188 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
1189 local_irq_restore(flags);
1191 EXPORT_SYMBOL(__netif_rx_schedule);
1193 void dev_kfree_skb_any(struct sk_buff *skb)
1195 if (in_irq() || irqs_disabled())
1196 dev_kfree_skb_irq(skb);
1200 EXPORT_SYMBOL(dev_kfree_skb_any);
1204 void netif_device_detach(struct net_device *dev)
1206 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1207 netif_running(dev)) {
1208 netif_stop_queue(dev);
1211 EXPORT_SYMBOL(netif_device_detach);
1213 void netif_device_attach(struct net_device *dev)
1215 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1216 netif_running(dev)) {
1217 netif_wake_queue(dev);
1218 __netdev_watchdog_up(dev);
1221 EXPORT_SYMBOL(netif_device_attach);
1225 * Invalidate hardware checksum when packet is to be mangled, and
1226 * complete checksum manually on outgoing path.
1228 int skb_checksum_help(struct sk_buff *skb)
1231 int ret = 0, offset;
1233 if (skb->ip_summed == CHECKSUM_COMPLETE)
1234 goto out_set_summed;
1236 if (unlikely(skb_shinfo(skb)->gso_size)) {
1237 /* Let GSO fix up the checksum. */
1238 goto out_set_summed;
1241 if (skb_cloned(skb)) {
1242 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1247 offset = skb->csum_start - skb_headroom(skb);
1248 BUG_ON(offset > (int)skb->len);
1249 csum = skb_checksum(skb, offset, skb->len-offset, 0);
1251 offset = skb_headlen(skb) - offset;
1252 BUG_ON(offset <= 0);
1253 BUG_ON(skb->csum_offset + 2 > offset);
1255 *(__sum16 *)(skb->head + skb->csum_start + skb->csum_offset) =
1258 skb->ip_summed = CHECKSUM_NONE;
1264 * skb_gso_segment - Perform segmentation on skb.
1265 * @skb: buffer to segment
1266 * @features: features for the output path (see dev->features)
1268 * This function segments the given skb and returns a list of segments.
1270 * It may return NULL if the skb requires no segmentation. This is
1271 * only possible when GSO is used for verifying header integrity.
1273 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1275 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1276 struct packet_type *ptype;
1277 __be16 type = skb->protocol;
1280 BUG_ON(skb_shinfo(skb)->frag_list);
1282 skb_reset_mac_header(skb);
1283 skb->mac_len = skb->network_header - skb->mac_header;
1284 __skb_pull(skb, skb->mac_len);
1286 if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) {
1287 if (skb_header_cloned(skb) &&
1288 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1289 return ERR_PTR(err);
1293 list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type) & 15], list) {
1294 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1295 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1296 err = ptype->gso_send_check(skb);
1297 segs = ERR_PTR(err);
1298 if (err || skb_gso_ok(skb, features))
1300 __skb_push(skb, (skb->data -
1301 skb_network_header(skb)));
1303 segs = ptype->gso_segment(skb, features);
1309 __skb_push(skb, skb->data - skb_mac_header(skb));
1314 EXPORT_SYMBOL(skb_gso_segment);
1316 /* Take action when hardware reception checksum errors are detected. */
1318 void netdev_rx_csum_fault(struct net_device *dev)
1320 if (net_ratelimit()) {
1321 printk(KERN_ERR "%s: hw csum failure.\n",
1322 dev ? dev->name : "<unknown>");
1326 EXPORT_SYMBOL(netdev_rx_csum_fault);
1329 /* Actually, we should eliminate this check as soon as we know, that:
1330 * 1. IOMMU is present and allows to map all the memory.
1331 * 2. No high memory really exists on this machine.
1334 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1336 #ifdef CONFIG_HIGHMEM
1339 if (dev->features & NETIF_F_HIGHDMA)
1342 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1343 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1351 void (*destructor)(struct sk_buff *skb);
1354 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1356 static void dev_gso_skb_destructor(struct sk_buff *skb)
1358 struct dev_gso_cb *cb;
1361 struct sk_buff *nskb = skb->next;
1363 skb->next = nskb->next;
1366 } while (skb->next);
1368 cb = DEV_GSO_CB(skb);
1370 cb->destructor(skb);
1374 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1375 * @skb: buffer to segment
1377 * This function segments the given skb and stores the list of segments
1380 static int dev_gso_segment(struct sk_buff *skb)
1382 struct net_device *dev = skb->dev;
1383 struct sk_buff *segs;
1384 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1387 segs = skb_gso_segment(skb, features);
1389 /* Verifying header integrity only. */
1393 if (unlikely(IS_ERR(segs)))
1394 return PTR_ERR(segs);
1397 DEV_GSO_CB(skb)->destructor = skb->destructor;
1398 skb->destructor = dev_gso_skb_destructor;
1403 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
1405 if (likely(!skb->next)) {
1406 if (!list_empty(&ptype_all))
1407 dev_queue_xmit_nit(skb, dev);
1409 if (netif_needs_gso(dev, skb)) {
1410 if (unlikely(dev_gso_segment(skb)))
1416 return dev->hard_start_xmit(skb, dev);
1421 struct sk_buff *nskb = skb->next;
1424 skb->next = nskb->next;
1426 rc = dev->hard_start_xmit(nskb, dev);
1428 nskb->next = skb->next;
1432 if (unlikely(netif_queue_stopped(dev) && skb->next))
1433 return NETDEV_TX_BUSY;
1434 } while (skb->next);
1436 skb->destructor = DEV_GSO_CB(skb)->destructor;
1443 #define HARD_TX_LOCK(dev, cpu) { \
1444 if ((dev->features & NETIF_F_LLTX) == 0) { \
1445 netif_tx_lock(dev); \
1449 #define HARD_TX_UNLOCK(dev) { \
1450 if ((dev->features & NETIF_F_LLTX) == 0) { \
1451 netif_tx_unlock(dev); \
1456 * dev_queue_xmit - transmit a buffer
1457 * @skb: buffer to transmit
1459 * Queue a buffer for transmission to a network device. The caller must
1460 * have set the device and priority and built the buffer before calling
1461 * this function. The function can be called from an interrupt.
1463 * A negative errno code is returned on a failure. A success does not
1464 * guarantee the frame will be transmitted as it may be dropped due
1465 * to congestion or traffic shaping.
1467 * -----------------------------------------------------------------------------------
1468 * I notice this method can also return errors from the queue disciplines,
1469 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1472 * Regardless of the return value, the skb is consumed, so it is currently
1473 * difficult to retry a send to this method. (You can bump the ref count
1474 * before sending to hold a reference for retry if you are careful.)
1476 * When calling this method, interrupts MUST be enabled. This is because
1477 * the BH enable code must have IRQs enabled so that it will not deadlock.
1481 int dev_queue_xmit(struct sk_buff *skb)
1483 struct net_device *dev = skb->dev;
1487 /* GSO will handle the following emulations directly. */
1488 if (netif_needs_gso(dev, skb))
1491 if (skb_shinfo(skb)->frag_list &&
1492 !(dev->features & NETIF_F_FRAGLIST) &&
1493 __skb_linearize(skb))
1496 /* Fragmented skb is linearized if device does not support SG,
1497 * or if at least one of fragments is in highmem and device
1498 * does not support DMA from it.
1500 if (skb_shinfo(skb)->nr_frags &&
1501 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1502 __skb_linearize(skb))
1505 /* If packet is not checksummed and device does not support
1506 * checksumming for this protocol, complete checksumming here.
1508 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1509 skb_set_transport_header(skb, skb->csum_start -
1512 if (!(dev->features & NETIF_F_GEN_CSUM)
1513 || ((dev->features & NETIF_F_IP_CSUM)
1514 && skb->protocol == htons(ETH_P_IP))
1515 || ((dev->features & NETIF_F_IPV6_CSUM)
1516 && skb->protocol == htons(ETH_P_IPV6)))
1517 if (skb_checksum_help(skb))
1522 spin_lock_prefetch(&dev->queue_lock);
1524 /* Disable soft irqs for various locks below. Also
1525 * stops preemption for RCU.
1529 /* Updates of qdisc are serialized by queue_lock.
1530 * The struct Qdisc which is pointed to by qdisc is now a
1531 * rcu structure - it may be accessed without acquiring
1532 * a lock (but the structure may be stale.) The freeing of the
1533 * qdisc will be deferred until it's known that there are no
1534 * more references to it.
1536 * If the qdisc has an enqueue function, we still need to
1537 * hold the queue_lock before calling it, since queue_lock
1538 * also serializes access to the device queue.
1541 q = rcu_dereference(dev->qdisc);
1542 #ifdef CONFIG_NET_CLS_ACT
1543 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1546 /* Grab device queue */
1547 spin_lock(&dev->queue_lock);
1550 rc = q->enqueue(skb, q);
1552 spin_unlock(&dev->queue_lock);
1554 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1557 spin_unlock(&dev->queue_lock);
1560 /* The device has no queue. Common case for software devices:
1561 loopback, all the sorts of tunnels...
1563 Really, it is unlikely that netif_tx_lock protection is necessary
1564 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1566 However, it is possible, that they rely on protection
1569 Check this and shot the lock. It is not prone from deadlocks.
1570 Either shot noqueue qdisc, it is even simpler 8)
1572 if (dev->flags & IFF_UP) {
1573 int cpu = smp_processor_id(); /* ok because BHs are off */
1575 if (dev->xmit_lock_owner != cpu) {
1577 HARD_TX_LOCK(dev, cpu);
1579 if (!netif_queue_stopped(dev)) {
1581 if (!dev_hard_start_xmit(skb, dev)) {
1582 HARD_TX_UNLOCK(dev);
1586 HARD_TX_UNLOCK(dev);
1587 if (net_ratelimit())
1588 printk(KERN_CRIT "Virtual device %s asks to "
1589 "queue packet!\n", dev->name);
1591 /* Recursion is detected! It is possible,
1593 if (net_ratelimit())
1594 printk(KERN_CRIT "Dead loop on virtual device "
1595 "%s, fix it urgently!\n", dev->name);
1600 rcu_read_unlock_bh();
1606 rcu_read_unlock_bh();
1611 /*=======================================================================
1613 =======================================================================*/
1615 int netdev_max_backlog __read_mostly = 1000;
1616 int netdev_budget __read_mostly = 300;
1617 int weight_p __read_mostly = 64; /* old backlog weight */
1619 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1623 * netif_rx - post buffer to the network code
1624 * @skb: buffer to post
1626 * This function receives a packet from a device driver and queues it for
1627 * the upper (protocol) levels to process. It always succeeds. The buffer
1628 * may be dropped during processing for congestion control or by the
1632 * NET_RX_SUCCESS (no congestion)
1633 * NET_RX_CN_LOW (low congestion)
1634 * NET_RX_CN_MOD (moderate congestion)
1635 * NET_RX_CN_HIGH (high congestion)
1636 * NET_RX_DROP (packet was dropped)
1640 int netif_rx(struct sk_buff *skb)
1642 struct softnet_data *queue;
1643 unsigned long flags;
1645 /* if netpoll wants it, pretend we never saw it */
1646 if (netpoll_rx(skb))
1649 if (!skb->tstamp.tv64)
1653 * The code is rearranged so that the path is the most
1654 * short when CPU is congested, but is still operating.
1656 local_irq_save(flags);
1657 queue = &__get_cpu_var(softnet_data);
1659 __get_cpu_var(netdev_rx_stat).total++;
1660 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1661 if (queue->input_pkt_queue.qlen) {
1664 __skb_queue_tail(&queue->input_pkt_queue, skb);
1665 local_irq_restore(flags);
1666 return NET_RX_SUCCESS;
1669 netif_rx_schedule(&queue->backlog_dev);
1673 __get_cpu_var(netdev_rx_stat).dropped++;
1674 local_irq_restore(flags);
1680 int netif_rx_ni(struct sk_buff *skb)
1685 err = netif_rx(skb);
1686 if (local_softirq_pending())
1693 EXPORT_SYMBOL(netif_rx_ni);
1695 static inline struct net_device *skb_bond(struct sk_buff *skb)
1697 struct net_device *dev = skb->dev;
1700 if (skb_bond_should_drop(skb)) {
1704 skb->dev = dev->master;
1710 static void net_tx_action(struct softirq_action *h)
1712 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1714 if (sd->completion_queue) {
1715 struct sk_buff *clist;
1717 local_irq_disable();
1718 clist = sd->completion_queue;
1719 sd->completion_queue = NULL;
1723 struct sk_buff *skb = clist;
1724 clist = clist->next;
1726 BUG_TRAP(!atomic_read(&skb->users));
1731 if (sd->output_queue) {
1732 struct net_device *head;
1734 local_irq_disable();
1735 head = sd->output_queue;
1736 sd->output_queue = NULL;
1740 struct net_device *dev = head;
1741 head = head->next_sched;
1743 smp_mb__before_clear_bit();
1744 clear_bit(__LINK_STATE_SCHED, &dev->state);
1746 if (spin_trylock(&dev->queue_lock)) {
1748 spin_unlock(&dev->queue_lock);
1750 netif_schedule(dev);
1756 static inline int deliver_skb(struct sk_buff *skb,
1757 struct packet_type *pt_prev,
1758 struct net_device *orig_dev)
1760 atomic_inc(&skb->users);
1761 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1764 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1765 /* These hooks defined here for ATM */
1767 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1768 unsigned char *addr);
1769 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
1772 * If bridge module is loaded call bridging hook.
1773 * returns NULL if packet was consumed.
1775 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
1776 struct sk_buff *skb) __read_mostly;
1777 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
1778 struct packet_type **pt_prev, int *ret,
1779 struct net_device *orig_dev)
1781 struct net_bridge_port *port;
1783 if (skb->pkt_type == PACKET_LOOPBACK ||
1784 (port = rcu_dereference(skb->dev->br_port)) == NULL)
1788 *ret = deliver_skb(skb, *pt_prev, orig_dev);
1792 return br_handle_frame_hook(port, skb);
1795 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
1798 #ifdef CONFIG_NET_CLS_ACT
1799 /* TODO: Maybe we should just force sch_ingress to be compiled in
1800 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
1801 * a compare and 2 stores extra right now if we dont have it on
1802 * but have CONFIG_NET_CLS_ACT
1803 * NOTE: This doesnt stop any functionality; if you dont have
1804 * the ingress scheduler, you just cant add policies on ingress.
1807 static int ing_filter(struct sk_buff *skb)
1810 struct net_device *dev = skb->dev;
1811 int result = TC_ACT_OK;
1813 if (dev->qdisc_ingress) {
1814 __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
1815 if (MAX_RED_LOOP < ttl++) {
1816 printk(KERN_WARNING "Redir loop detected Dropping packet (%d->%d)\n",
1817 skb->iif, skb->dev->ifindex);
1821 skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl);
1823 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS);
1825 spin_lock(&dev->ingress_lock);
1826 if ((q = dev->qdisc_ingress) != NULL)
1827 result = q->enqueue(skb, q);
1828 spin_unlock(&dev->ingress_lock);
1836 int netif_receive_skb(struct sk_buff *skb)
1838 struct packet_type *ptype, *pt_prev;
1839 struct net_device *orig_dev;
1840 int ret = NET_RX_DROP;
1843 /* if we've gotten here through NAPI, check netpoll */
1844 if (skb->dev->poll && netpoll_rx(skb))
1847 if (!skb->tstamp.tv64)
1851 skb->iif = skb->dev->ifindex;
1853 orig_dev = skb_bond(skb);
1858 __get_cpu_var(netdev_rx_stat).total++;
1860 skb_reset_network_header(skb);
1861 skb_reset_transport_header(skb);
1862 skb->mac_len = skb->network_header - skb->mac_header;
1868 #ifdef CONFIG_NET_CLS_ACT
1869 if (skb->tc_verd & TC_NCLS) {
1870 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
1875 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1876 if (!ptype->dev || ptype->dev == skb->dev) {
1878 ret = deliver_skb(skb, pt_prev, orig_dev);
1883 #ifdef CONFIG_NET_CLS_ACT
1885 ret = deliver_skb(skb, pt_prev, orig_dev);
1886 pt_prev = NULL; /* noone else should process this after*/
1888 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
1891 ret = ing_filter(skb);
1893 if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
1902 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
1906 type = skb->protocol;
1907 list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {
1908 if (ptype->type == type &&
1909 (!ptype->dev || ptype->dev == skb->dev)) {
1911 ret = deliver_skb(skb, pt_prev, orig_dev);
1917 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1920 /* Jamal, now you will not able to escape explaining
1921 * me how you were going to use this. :-)
1931 static int process_backlog(struct net_device *backlog_dev, int *budget)
1934 int quota = min(backlog_dev->quota, *budget);
1935 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1936 unsigned long start_time = jiffies;
1938 backlog_dev->weight = weight_p;
1940 struct sk_buff *skb;
1941 struct net_device *dev;
1943 local_irq_disable();
1944 skb = __skb_dequeue(&queue->input_pkt_queue);
1951 netif_receive_skb(skb);
1957 if (work >= quota || jiffies - start_time > 1)
1962 backlog_dev->quota -= work;
1967 backlog_dev->quota -= work;
1970 list_del(&backlog_dev->poll_list);
1971 smp_mb__before_clear_bit();
1972 netif_poll_enable(backlog_dev);
1978 static void net_rx_action(struct softirq_action *h)
1980 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1981 unsigned long start_time = jiffies;
1982 int budget = netdev_budget;
1985 local_irq_disable();
1987 while (!list_empty(&queue->poll_list)) {
1988 struct net_device *dev;
1990 if (budget <= 0 || jiffies - start_time > 1)
1995 dev = list_entry(queue->poll_list.next,
1996 struct net_device, poll_list);
1997 have = netpoll_poll_lock(dev);
1999 if (dev->quota <= 0 || dev->poll(dev, &budget)) {
2000 netpoll_poll_unlock(have);
2001 local_irq_disable();
2002 list_move_tail(&dev->poll_list, &queue->poll_list);
2004 dev->quota += dev->weight;
2006 dev->quota = dev->weight;
2008 netpoll_poll_unlock(have);
2010 local_irq_disable();
2015 #ifdef CONFIG_NET_DMA
2017 * There may not be any more sk_buffs coming right now, so push
2018 * any pending DMA copies to hardware
2020 if (net_dma_client) {
2021 struct dma_chan *chan;
2023 list_for_each_entry_rcu(chan, &net_dma_client->channels, client_node)
2024 dma_async_memcpy_issue_pending(chan);
2031 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2032 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2036 static gifconf_func_t * gifconf_list [NPROTO];
2039 * register_gifconf - register a SIOCGIF handler
2040 * @family: Address family
2041 * @gifconf: Function handler
2043 * Register protocol dependent address dumping routines. The handler
2044 * that is passed must not be freed or reused until it has been replaced
2045 * by another handler.
2047 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
2049 if (family >= NPROTO)
2051 gifconf_list[family] = gifconf;
2057 * Map an interface index to its name (SIOCGIFNAME)
2061 * We need this ioctl for efficient implementation of the
2062 * if_indextoname() function required by the IPv6 API. Without
2063 * it, we would have to search all the interfaces to find a
2067 static int dev_ifname(struct ifreq __user *arg)
2069 struct net_device *dev;
2073 * Fetch the caller's info block.
2076 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2079 read_lock(&dev_base_lock);
2080 dev = __dev_get_by_index(ifr.ifr_ifindex);
2082 read_unlock(&dev_base_lock);
2086 strcpy(ifr.ifr_name, dev->name);
2087 read_unlock(&dev_base_lock);
2089 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2095 * Perform a SIOCGIFCONF call. This structure will change
2096 * size eventually, and there is nothing I can do about it.
2097 * Thus we will need a 'compatibility mode'.
2100 static int dev_ifconf(char __user *arg)
2103 struct net_device *dev;
2110 * Fetch the caller's info block.
2113 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2120 * Loop over the interfaces, and write an info block for each.
2124 for_each_netdev(dev) {
2125 for (i = 0; i < NPROTO; i++) {
2126 if (gifconf_list[i]) {
2129 done = gifconf_list[i](dev, NULL, 0);
2131 done = gifconf_list[i](dev, pos + total,
2141 * All done. Write the updated control block back to the caller.
2143 ifc.ifc_len = total;
2146 * Both BSD and Solaris return 0 here, so we do too.
2148 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2151 #ifdef CONFIG_PROC_FS
2153 * This is invoked by the /proc filesystem handler to display a device
2156 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2159 struct net_device *dev;
2161 read_lock(&dev_base_lock);
2163 return SEQ_START_TOKEN;
2166 for_each_netdev(dev)
2173 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2176 return v == SEQ_START_TOKEN ?
2177 first_net_device() : next_net_device((struct net_device *)v);
2180 void dev_seq_stop(struct seq_file *seq, void *v)
2182 read_unlock(&dev_base_lock);
2185 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2187 struct net_device_stats *stats = dev->get_stats(dev);
2189 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2190 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2191 dev->name, stats->rx_bytes, stats->rx_packets,
2193 stats->rx_dropped + stats->rx_missed_errors,
2194 stats->rx_fifo_errors,
2195 stats->rx_length_errors + stats->rx_over_errors +
2196 stats->rx_crc_errors + stats->rx_frame_errors,
2197 stats->rx_compressed, stats->multicast,
2198 stats->tx_bytes, stats->tx_packets,
2199 stats->tx_errors, stats->tx_dropped,
2200 stats->tx_fifo_errors, stats->collisions,
2201 stats->tx_carrier_errors +
2202 stats->tx_aborted_errors +
2203 stats->tx_window_errors +
2204 stats->tx_heartbeat_errors,
2205 stats->tx_compressed);
2209 * Called from the PROCfs module. This now uses the new arbitrary sized
2210 * /proc/net interface to create /proc/net/dev
2212 static int dev_seq_show(struct seq_file *seq, void *v)
2214 if (v == SEQ_START_TOKEN)
2215 seq_puts(seq, "Inter-| Receive "
2217 " face |bytes packets errs drop fifo frame "
2218 "compressed multicast|bytes packets errs "
2219 "drop fifo colls carrier compressed\n");
2221 dev_seq_printf_stats(seq, v);
2225 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2227 struct netif_rx_stats *rc = NULL;
2229 while (*pos < NR_CPUS)
2230 if (cpu_online(*pos)) {
2231 rc = &per_cpu(netdev_rx_stat, *pos);
2238 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2240 return softnet_get_online(pos);
2243 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2246 return softnet_get_online(pos);
2249 static void softnet_seq_stop(struct seq_file *seq, void *v)
2253 static int softnet_seq_show(struct seq_file *seq, void *v)
2255 struct netif_rx_stats *s = v;
2257 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2258 s->total, s->dropped, s->time_squeeze, 0,
2259 0, 0, 0, 0, /* was fastroute */
2264 static const struct seq_operations dev_seq_ops = {
2265 .start = dev_seq_start,
2266 .next = dev_seq_next,
2267 .stop = dev_seq_stop,
2268 .show = dev_seq_show,
2271 static int dev_seq_open(struct inode *inode, struct file *file)
2273 return seq_open(file, &dev_seq_ops);
2276 static const struct file_operations dev_seq_fops = {
2277 .owner = THIS_MODULE,
2278 .open = dev_seq_open,
2280 .llseek = seq_lseek,
2281 .release = seq_release,
2284 static const struct seq_operations softnet_seq_ops = {
2285 .start = softnet_seq_start,
2286 .next = softnet_seq_next,
2287 .stop = softnet_seq_stop,
2288 .show = softnet_seq_show,
2291 static int softnet_seq_open(struct inode *inode, struct file *file)
2293 return seq_open(file, &softnet_seq_ops);
2296 static const struct file_operations softnet_seq_fops = {
2297 .owner = THIS_MODULE,
2298 .open = softnet_seq_open,
2300 .llseek = seq_lseek,
2301 .release = seq_release,
2304 static void *ptype_get_idx(loff_t pos)
2306 struct packet_type *pt = NULL;
2310 list_for_each_entry_rcu(pt, &ptype_all, list) {
2316 for (t = 0; t < 16; t++) {
2317 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
2326 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
2329 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
2332 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2334 struct packet_type *pt;
2335 struct list_head *nxt;
2339 if (v == SEQ_START_TOKEN)
2340 return ptype_get_idx(0);
2343 nxt = pt->list.next;
2344 if (pt->type == htons(ETH_P_ALL)) {
2345 if (nxt != &ptype_all)
2348 nxt = ptype_base[0].next;
2350 hash = ntohs(pt->type) & 15;
2352 while (nxt == &ptype_base[hash]) {
2355 nxt = ptype_base[hash].next;
2358 return list_entry(nxt, struct packet_type, list);
2361 static void ptype_seq_stop(struct seq_file *seq, void *v)
2366 static void ptype_seq_decode(struct seq_file *seq, void *sym)
2368 #ifdef CONFIG_KALLSYMS
2369 unsigned long offset = 0, symsize;
2370 const char *symname;
2374 symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset,
2381 modname = delim = "";
2382 seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim,
2388 seq_printf(seq, "[%p]", sym);
2391 static int ptype_seq_show(struct seq_file *seq, void *v)
2393 struct packet_type *pt = v;
2395 if (v == SEQ_START_TOKEN)
2396 seq_puts(seq, "Type Device Function\n");
2398 if (pt->type == htons(ETH_P_ALL))
2399 seq_puts(seq, "ALL ");
2401 seq_printf(seq, "%04x", ntohs(pt->type));
2403 seq_printf(seq, " %-8s ",
2404 pt->dev ? pt->dev->name : "");
2405 ptype_seq_decode(seq, pt->func);
2406 seq_putc(seq, '\n');
2412 static const struct seq_operations ptype_seq_ops = {
2413 .start = ptype_seq_start,
2414 .next = ptype_seq_next,
2415 .stop = ptype_seq_stop,
2416 .show = ptype_seq_show,
2419 static int ptype_seq_open(struct inode *inode, struct file *file)
2421 return seq_open(file, &ptype_seq_ops);
2424 static const struct file_operations ptype_seq_fops = {
2425 .owner = THIS_MODULE,
2426 .open = ptype_seq_open,
2428 .llseek = seq_lseek,
2429 .release = seq_release,
2433 static int __init dev_proc_init(void)
2437 if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops))
2439 if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops))
2441 if (!proc_net_fops_create("ptype", S_IRUGO, &ptype_seq_fops))
2444 if (wext_proc_init())
2450 proc_net_remove("ptype");
2452 proc_net_remove("softnet_stat");
2454 proc_net_remove("dev");
2458 #define dev_proc_init() 0
2459 #endif /* CONFIG_PROC_FS */
2463 * netdev_set_master - set up master/slave pair
2464 * @slave: slave device
2465 * @master: new master device
2467 * Changes the master device of the slave. Pass %NULL to break the
2468 * bonding. The caller must hold the RTNL semaphore. On a failure
2469 * a negative errno code is returned. On success the reference counts
2470 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2471 * function returns zero.
2473 int netdev_set_master(struct net_device *slave, struct net_device *master)
2475 struct net_device *old = slave->master;
2485 slave->master = master;
2493 slave->flags |= IFF_SLAVE;
2495 slave->flags &= ~IFF_SLAVE;
2497 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2502 * dev_set_promiscuity - update promiscuity count on a device
2506 * Add or remove promiscuity from a device. While the count in the device
2507 * remains above zero the interface remains promiscuous. Once it hits zero
2508 * the device reverts back to normal filtering operation. A negative inc
2509 * value is used to drop promiscuity on the device.
2511 void dev_set_promiscuity(struct net_device *dev, int inc)
2513 unsigned short old_flags = dev->flags;
2515 if ((dev->promiscuity += inc) == 0)
2516 dev->flags &= ~IFF_PROMISC;
2518 dev->flags |= IFF_PROMISC;
2519 if (dev->flags != old_flags) {
2521 printk(KERN_INFO "device %s %s promiscuous mode\n",
2522 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2524 audit_log(current->audit_context, GFP_ATOMIC,
2525 AUDIT_ANOM_PROMISCUOUS,
2526 "dev=%s prom=%d old_prom=%d auid=%u",
2527 dev->name, (dev->flags & IFF_PROMISC),
2528 (old_flags & IFF_PROMISC),
2529 audit_get_loginuid(current->audit_context));
2534 * dev_set_allmulti - update allmulti count on a device
2538 * Add or remove reception of all multicast frames to a device. While the
2539 * count in the device remains above zero the interface remains listening
2540 * to all interfaces. Once it hits zero the device reverts back to normal
2541 * filtering operation. A negative @inc value is used to drop the counter
2542 * when releasing a resource needing all multicasts.
2545 void dev_set_allmulti(struct net_device *dev, int inc)
2547 unsigned short old_flags = dev->flags;
2549 dev->flags |= IFF_ALLMULTI;
2550 if ((dev->allmulti += inc) == 0)
2551 dev->flags &= ~IFF_ALLMULTI;
2552 if (dev->flags ^ old_flags)
2556 unsigned dev_get_flags(const struct net_device *dev)
2560 flags = (dev->flags & ~(IFF_PROMISC |
2565 (dev->gflags & (IFF_PROMISC |
2568 if (netif_running(dev)) {
2569 if (netif_oper_up(dev))
2570 flags |= IFF_RUNNING;
2571 if (netif_carrier_ok(dev))
2572 flags |= IFF_LOWER_UP;
2573 if (netif_dormant(dev))
2574 flags |= IFF_DORMANT;
2580 int dev_change_flags(struct net_device *dev, unsigned flags)
2583 int old_flags = dev->flags;
2586 * Set the flags on our device.
2589 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
2590 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
2592 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
2596 * Load in the correct multicast list now the flags have changed.
2602 * Have we downed the interface. We handle IFF_UP ourselves
2603 * according to user attempts to set it, rather than blindly
2608 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
2609 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
2615 if (dev->flags & IFF_UP &&
2616 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
2618 raw_notifier_call_chain(&netdev_chain,
2619 NETDEV_CHANGE, dev);
2621 if ((flags ^ dev->gflags) & IFF_PROMISC) {
2622 int inc = (flags & IFF_PROMISC) ? +1 : -1;
2623 dev->gflags ^= IFF_PROMISC;
2624 dev_set_promiscuity(dev, inc);
2627 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
2628 is important. Some (broken) drivers set IFF_PROMISC, when
2629 IFF_ALLMULTI is requested not asking us and not reporting.
2631 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
2632 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
2633 dev->gflags ^= IFF_ALLMULTI;
2634 dev_set_allmulti(dev, inc);
2637 /* Exclude state transition flags, already notified */
2638 changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
2640 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
2645 int dev_set_mtu(struct net_device *dev, int new_mtu)
2649 if (new_mtu == dev->mtu)
2652 /* MTU must be positive. */
2656 if (!netif_device_present(dev))
2660 if (dev->change_mtu)
2661 err = dev->change_mtu(dev, new_mtu);
2664 if (!err && dev->flags & IFF_UP)
2665 raw_notifier_call_chain(&netdev_chain,
2666 NETDEV_CHANGEMTU, dev);
2670 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
2674 if (!dev->set_mac_address)
2676 if (sa->sa_family != dev->type)
2678 if (!netif_device_present(dev))
2680 err = dev->set_mac_address(dev, sa);
2682 raw_notifier_call_chain(&netdev_chain,
2683 NETDEV_CHANGEADDR, dev);
2688 * Perform the SIOCxIFxxx calls.
2690 static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
2693 struct net_device *dev = __dev_get_by_name(ifr->ifr_name);
2699 case SIOCGIFFLAGS: /* Get interface flags */
2700 ifr->ifr_flags = dev_get_flags(dev);
2703 case SIOCSIFFLAGS: /* Set interface flags */
2704 return dev_change_flags(dev, ifr->ifr_flags);
2706 case SIOCGIFMETRIC: /* Get the metric on the interface
2707 (currently unused) */
2708 ifr->ifr_metric = 0;
2711 case SIOCSIFMETRIC: /* Set the metric on the interface
2712 (currently unused) */
2715 case SIOCGIFMTU: /* Get the MTU of a device */
2716 ifr->ifr_mtu = dev->mtu;
2719 case SIOCSIFMTU: /* Set the MTU of a device */
2720 return dev_set_mtu(dev, ifr->ifr_mtu);
2724 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
2726 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
2727 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2728 ifr->ifr_hwaddr.sa_family = dev->type;
2732 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
2734 case SIOCSIFHWBROADCAST:
2735 if (ifr->ifr_hwaddr.sa_family != dev->type)
2737 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
2738 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2739 raw_notifier_call_chain(&netdev_chain,
2740 NETDEV_CHANGEADDR, dev);
2744 ifr->ifr_map.mem_start = dev->mem_start;
2745 ifr->ifr_map.mem_end = dev->mem_end;
2746 ifr->ifr_map.base_addr = dev->base_addr;
2747 ifr->ifr_map.irq = dev->irq;
2748 ifr->ifr_map.dma = dev->dma;
2749 ifr->ifr_map.port = dev->if_port;
2753 if (dev->set_config) {
2754 if (!netif_device_present(dev))
2756 return dev->set_config(dev, &ifr->ifr_map);
2761 if (!dev->set_multicast_list ||
2762 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2764 if (!netif_device_present(dev))
2766 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
2770 if (!dev->set_multicast_list ||
2771 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2773 if (!netif_device_present(dev))
2775 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
2779 ifr->ifr_ifindex = dev->ifindex;
2783 ifr->ifr_qlen = dev->tx_queue_len;
2787 if (ifr->ifr_qlen < 0)
2789 dev->tx_queue_len = ifr->ifr_qlen;
2793 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
2794 return dev_change_name(dev, ifr->ifr_newname);
2797 * Unknown or private ioctl
2801 if ((cmd >= SIOCDEVPRIVATE &&
2802 cmd <= SIOCDEVPRIVATE + 15) ||
2803 cmd == SIOCBONDENSLAVE ||
2804 cmd == SIOCBONDRELEASE ||
2805 cmd == SIOCBONDSETHWADDR ||
2806 cmd == SIOCBONDSLAVEINFOQUERY ||
2807 cmd == SIOCBONDINFOQUERY ||
2808 cmd == SIOCBONDCHANGEACTIVE ||
2809 cmd == SIOCGMIIPHY ||
2810 cmd == SIOCGMIIREG ||
2811 cmd == SIOCSMIIREG ||
2812 cmd == SIOCBRADDIF ||
2813 cmd == SIOCBRDELIF ||
2814 cmd == SIOCWANDEV) {
2816 if (dev->do_ioctl) {
2817 if (netif_device_present(dev))
2818 err = dev->do_ioctl(dev, ifr,
2831 * This function handles all "interface"-type I/O control requests. The actual
2832 * 'doing' part of this is dev_ifsioc above.
2836 * dev_ioctl - network device ioctl
2837 * @cmd: command to issue
2838 * @arg: pointer to a struct ifreq in user space
2840 * Issue ioctl functions to devices. This is normally called by the
2841 * user space syscall interfaces but can sometimes be useful for
2842 * other purposes. The return value is the return from the syscall if
2843 * positive or a negative errno code on error.
2846 int dev_ioctl(unsigned int cmd, void __user *arg)
2852 /* One special case: SIOCGIFCONF takes ifconf argument
2853 and requires shared lock, because it sleeps writing
2857 if (cmd == SIOCGIFCONF) {
2859 ret = dev_ifconf((char __user *) arg);
2863 if (cmd == SIOCGIFNAME)
2864 return dev_ifname((struct ifreq __user *)arg);
2866 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2869 ifr.ifr_name[IFNAMSIZ-1] = 0;
2871 colon = strchr(ifr.ifr_name, ':');
2876 * See which interface the caller is talking about.
2881 * These ioctl calls:
2882 * - can be done by all.
2883 * - atomic and do not require locking.
2894 dev_load(ifr.ifr_name);
2895 read_lock(&dev_base_lock);
2896 ret = dev_ifsioc(&ifr, cmd);
2897 read_unlock(&dev_base_lock);
2901 if (copy_to_user(arg, &ifr,
2902 sizeof(struct ifreq)))
2908 dev_load(ifr.ifr_name);
2910 ret = dev_ethtool(&ifr);
2915 if (copy_to_user(arg, &ifr,
2916 sizeof(struct ifreq)))
2922 * These ioctl calls:
2923 * - require superuser power.
2924 * - require strict serialization.
2930 if (!capable(CAP_NET_ADMIN))
2932 dev_load(ifr.ifr_name);
2934 ret = dev_ifsioc(&ifr, cmd);
2939 if (copy_to_user(arg, &ifr,
2940 sizeof(struct ifreq)))
2946 * These ioctl calls:
2947 * - require superuser power.
2948 * - require strict serialization.
2949 * - do not return a value
2959 case SIOCSIFHWBROADCAST:
2962 case SIOCBONDENSLAVE:
2963 case SIOCBONDRELEASE:
2964 case SIOCBONDSETHWADDR:
2965 case SIOCBONDCHANGEACTIVE:
2968 if (!capable(CAP_NET_ADMIN))
2971 case SIOCBONDSLAVEINFOQUERY:
2972 case SIOCBONDINFOQUERY:
2973 dev_load(ifr.ifr_name);
2975 ret = dev_ifsioc(&ifr, cmd);
2980 /* Get the per device memory space. We can add this but
2981 * currently do not support it */
2983 /* Set the per device memory buffer space.
2984 * Not applicable in our case */
2989 * Unknown or private ioctl.
2992 if (cmd == SIOCWANDEV ||
2993 (cmd >= SIOCDEVPRIVATE &&
2994 cmd <= SIOCDEVPRIVATE + 15)) {
2995 dev_load(ifr.ifr_name);
2997 ret = dev_ifsioc(&ifr, cmd);
2999 if (!ret && copy_to_user(arg, &ifr,
3000 sizeof(struct ifreq)))
3004 /* Take care of Wireless Extensions */
3005 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
3006 return wext_handle_ioctl(&ifr, cmd, arg);
3013 * dev_new_index - allocate an ifindex
3015 * Returns a suitable unique value for a new device interface
3016 * number. The caller must hold the rtnl semaphore or the
3017 * dev_base_lock to be sure it remains unique.
3019 static int dev_new_index(void)
3025 if (!__dev_get_by_index(ifindex))
3030 static int dev_boot_phase = 1;
3032 /* Delayed registration/unregisteration */
3033 static DEFINE_SPINLOCK(net_todo_list_lock);
3034 static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list);
3036 static void net_set_todo(struct net_device *dev)
3038 spin_lock(&net_todo_list_lock);
3039 list_add_tail(&dev->todo_list, &net_todo_list);
3040 spin_unlock(&net_todo_list_lock);
3044 * register_netdevice - register a network device
3045 * @dev: device to register
3047 * Take a completed network device structure and add it to the kernel
3048 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3049 * chain. 0 is returned on success. A negative errno code is returned
3050 * on a failure to set up the device, or if the name is a duplicate.
3052 * Callers must hold the rtnl semaphore. You may want
3053 * register_netdev() instead of this.
3056 * The locking appears insufficient to guarantee two parallel registers
3057 * will not get the same name.
3060 int register_netdevice(struct net_device *dev)
3062 struct hlist_head *head;
3063 struct hlist_node *p;
3066 BUG_ON(dev_boot_phase);
3071 /* When net_device's are persistent, this will be fatal. */
3072 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
3074 spin_lock_init(&dev->queue_lock);
3075 spin_lock_init(&dev->_xmit_lock);
3076 netdev_set_lockdep_class(&dev->_xmit_lock, dev->type);
3077 dev->xmit_lock_owner = -1;
3078 spin_lock_init(&dev->ingress_lock);
3082 /* Init, if this function is available */
3084 ret = dev->init(dev);
3092 if (!dev_valid_name(dev->name)) {
3097 dev->ifindex = dev_new_index();
3098 if (dev->iflink == -1)
3099 dev->iflink = dev->ifindex;
3101 /* Check for existence of name */
3102 head = dev_name_hash(dev->name);
3103 hlist_for_each(p, head) {
3104 struct net_device *d
3105 = hlist_entry(p, struct net_device, name_hlist);
3106 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
3112 /* Fix illegal checksum combinations */
3113 if ((dev->features & NETIF_F_HW_CSUM) &&
3114 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3115 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
3117 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
3120 if ((dev->features & NETIF_F_NO_CSUM) &&
3121 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3122 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
3124 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
3128 /* Fix illegal SG+CSUM combinations. */
3129 if ((dev->features & NETIF_F_SG) &&
3130 !(dev->features & NETIF_F_ALL_CSUM)) {
3131 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
3133 dev->features &= ~NETIF_F_SG;
3136 /* TSO requires that SG is present as well. */
3137 if ((dev->features & NETIF_F_TSO) &&
3138 !(dev->features & NETIF_F_SG)) {
3139 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
3141 dev->features &= ~NETIF_F_TSO;
3143 if (dev->features & NETIF_F_UFO) {
3144 if (!(dev->features & NETIF_F_HW_CSUM)) {
3145 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3146 "NETIF_F_HW_CSUM feature.\n",
3148 dev->features &= ~NETIF_F_UFO;
3150 if (!(dev->features & NETIF_F_SG)) {
3151 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3152 "NETIF_F_SG feature.\n",
3154 dev->features &= ~NETIF_F_UFO;
3159 * nil rebuild_header routine,
3160 * that should be never called and used as just bug trap.
3163 if (!dev->rebuild_header)
3164 dev->rebuild_header = default_rebuild_header;
3166 ret = netdev_register_sysfs(dev);
3169 dev->reg_state = NETREG_REGISTERED;
3172 * Default initial state at registry is that the
3173 * device is present.
3176 set_bit(__LINK_STATE_PRESENT, &dev->state);
3178 dev_init_scheduler(dev);
3179 write_lock_bh(&dev_base_lock);
3180 list_add_tail(&dev->dev_list, &dev_base_head);
3181 hlist_add_head(&dev->name_hlist, head);
3182 hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex));
3184 write_unlock_bh(&dev_base_lock);
3186 /* Notify protocols, that a new device appeared. */
3187 raw_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
3196 * register_netdev - register a network device
3197 * @dev: device to register
3199 * Take a completed network device structure and add it to the kernel
3200 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3201 * chain. 0 is returned on success. A negative errno code is returned
3202 * on a failure to set up the device, or if the name is a duplicate.
3204 * This is a wrapper around register_netdevice that takes the rtnl semaphore
3205 * and expands the device name if you passed a format string to
3208 int register_netdev(struct net_device *dev)
3215 * If the name is a format string the caller wants us to do a
3218 if (strchr(dev->name, '%')) {
3219 err = dev_alloc_name(dev, dev->name);
3224 err = register_netdevice(dev);
3229 EXPORT_SYMBOL(register_netdev);
3232 * netdev_wait_allrefs - wait until all references are gone.
3234 * This is called when unregistering network devices.
3236 * Any protocol or device that holds a reference should register
3237 * for netdevice notification, and cleanup and put back the
3238 * reference if they receive an UNREGISTER event.
3239 * We can get stuck here if buggy protocols don't correctly
3242 static void netdev_wait_allrefs(struct net_device *dev)
3244 unsigned long rebroadcast_time, warning_time;
3246 rebroadcast_time = warning_time = jiffies;
3247 while (atomic_read(&dev->refcnt) != 0) {
3248 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
3251 /* Rebroadcast unregister notification */
3252 raw_notifier_call_chain(&netdev_chain,
3253 NETDEV_UNREGISTER, dev);
3255 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
3257 /* We must not have linkwatch events
3258 * pending on unregister. If this
3259 * happens, we simply run the queue
3260 * unscheduled, resulting in a noop
3263 linkwatch_run_queue();
3268 rebroadcast_time = jiffies;
3273 if (time_after(jiffies, warning_time + 10 * HZ)) {
3274 printk(KERN_EMERG "unregister_netdevice: "
3275 "waiting for %s to become free. Usage "
3277 dev->name, atomic_read(&dev->refcnt));
3278 warning_time = jiffies;
3287 * register_netdevice(x1);
3288 * register_netdevice(x2);
3290 * unregister_netdevice(y1);
3291 * unregister_netdevice(y2);
3297 * We are invoked by rtnl_unlock() after it drops the semaphore.
3298 * This allows us to deal with problems:
3299 * 1) We can delete sysfs objects which invoke hotplug
3300 * without deadlocking with linkwatch via keventd.
3301 * 2) Since we run with the RTNL semaphore not held, we can sleep
3302 * safely in order to wait for the netdev refcnt to drop to zero.
3304 static DEFINE_MUTEX(net_todo_run_mutex);
3305 void netdev_run_todo(void)
3307 struct list_head list;
3309 /* Need to guard against multiple cpu's getting out of order. */
3310 mutex_lock(&net_todo_run_mutex);
3312 /* Not safe to do outside the semaphore. We must not return
3313 * until all unregister events invoked by the local processor
3314 * have been completed (either by this todo run, or one on
3317 if (list_empty(&net_todo_list))
3320 /* Snapshot list, allow later requests */
3321 spin_lock(&net_todo_list_lock);
3322 list_replace_init(&net_todo_list, &list);
3323 spin_unlock(&net_todo_list_lock);
3325 while (!list_empty(&list)) {
3326 struct net_device *dev
3327 = list_entry(list.next, struct net_device, todo_list);
3328 list_del(&dev->todo_list);
3330 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
3331 printk(KERN_ERR "network todo '%s' but state %d\n",
3332 dev->name, dev->reg_state);
3337 dev->reg_state = NETREG_UNREGISTERED;
3339 netdev_wait_allrefs(dev);
3342 BUG_ON(atomic_read(&dev->refcnt));
3343 BUG_TRAP(!dev->ip_ptr);
3344 BUG_TRAP(!dev->ip6_ptr);
3345 BUG_TRAP(!dev->dn_ptr);
3347 if (dev->destructor)
3348 dev->destructor(dev);
3350 /* Free network device */
3351 kobject_put(&dev->dev.kobj);
3355 mutex_unlock(&net_todo_run_mutex);
3358 static struct net_device_stats *internal_stats(struct net_device *dev)
3364 * alloc_netdev - allocate network device
3365 * @sizeof_priv: size of private data to allocate space for
3366 * @name: device name format string
3367 * @setup: callback to initialize device
3369 * Allocates a struct net_device with private data area for driver use
3370 * and performs basic initialization.
3372 struct net_device *alloc_netdev(int sizeof_priv, const char *name,
3373 void (*setup)(struct net_device *))
3376 struct net_device *dev;
3379 BUG_ON(strlen(name) >= sizeof(dev->name));
3381 /* ensure 32-byte alignment of both the device and private area */
3382 alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
3383 alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
3385 p = kzalloc(alloc_size, GFP_KERNEL);
3387 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
3391 dev = (struct net_device *)
3392 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
3393 dev->padded = (char *)dev - (char *)p;
3396 dev->priv = netdev_priv(dev);
3398 dev->get_stats = internal_stats;
3400 strcpy(dev->name, name);
3403 EXPORT_SYMBOL(alloc_netdev);
3406 * free_netdev - free network device
3409 * This function does the last stage of destroying an allocated device
3410 * interface. The reference to the device object is released.
3411 * If this is the last reference then it will be freed.
3413 void free_netdev(struct net_device *dev)
3416 /* Compatibility with error handling in drivers */
3417 if (dev->reg_state == NETREG_UNINITIALIZED) {
3418 kfree((char *)dev - dev->padded);
3422 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
3423 dev->reg_state = NETREG_RELEASED;
3425 /* will free via device release */
3426 put_device(&dev->dev);
3428 kfree((char *)dev - dev->padded);
3432 /* Synchronize with packet receive processing. */
3433 void synchronize_net(void)
3440 * unregister_netdevice - remove device from the kernel
3443 * This function shuts down a device interface and removes it
3444 * from the kernel tables. On success 0 is returned, on a failure
3445 * a negative errno code is returned.
3447 * Callers must hold the rtnl semaphore. You may want
3448 * unregister_netdev() instead of this.
3451 void unregister_netdevice(struct net_device *dev)
3453 BUG_ON(dev_boot_phase);
3456 /* Some devices call without registering for initialization unwind. */
3457 if (dev->reg_state == NETREG_UNINITIALIZED) {
3458 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3459 "was registered\n", dev->name, dev);
3465 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3467 /* If device is running, close it first. */
3468 if (dev->flags & IFF_UP)
3471 /* And unlink it from device chain. */
3472 write_lock_bh(&dev_base_lock);
3473 list_del(&dev->dev_list);
3474 hlist_del(&dev->name_hlist);
3475 hlist_del(&dev->index_hlist);
3476 write_unlock_bh(&dev_base_lock);
3478 dev->reg_state = NETREG_UNREGISTERING;
3482 /* Shutdown queueing discipline. */
3486 /* Notify protocols, that we are about to destroy
3487 this device. They should clean all the things.
3489 raw_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
3492 * Flush the multicast chain
3494 dev_mc_discard(dev);
3499 /* Notifier chain MUST detach us from master device. */
3500 BUG_TRAP(!dev->master);
3502 /* Remove entries from sysfs */
3503 netdev_unregister_sysfs(dev);
3505 /* Finish processing unregister after unlock */
3514 * unregister_netdev - remove device from the kernel
3517 * This function shuts down a device interface and removes it
3518 * from the kernel tables. On success 0 is returned, on a failure
3519 * a negative errno code is returned.
3521 * This is just a wrapper for unregister_netdevice that takes
3522 * the rtnl semaphore. In general you want to use this and not
3523 * unregister_netdevice.
3525 void unregister_netdev(struct net_device *dev)
3528 unregister_netdevice(dev);
3532 EXPORT_SYMBOL(unregister_netdev);
3534 static int dev_cpu_callback(struct notifier_block *nfb,
3535 unsigned long action,
3538 struct sk_buff **list_skb;
3539 struct net_device **list_net;
3540 struct sk_buff *skb;
3541 unsigned int cpu, oldcpu = (unsigned long)ocpu;
3542 struct softnet_data *sd, *oldsd;
3544 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
3547 local_irq_disable();
3548 cpu = smp_processor_id();
3549 sd = &per_cpu(softnet_data, cpu);
3550 oldsd = &per_cpu(softnet_data, oldcpu);
3552 /* Find end of our completion_queue. */
3553 list_skb = &sd->completion_queue;
3555 list_skb = &(*list_skb)->next;
3556 /* Append completion queue from offline CPU. */
3557 *list_skb = oldsd->completion_queue;
3558 oldsd->completion_queue = NULL;
3560 /* Find end of our output_queue. */
3561 list_net = &sd->output_queue;
3563 list_net = &(*list_net)->next_sched;
3564 /* Append output queue from offline CPU. */
3565 *list_net = oldsd->output_queue;
3566 oldsd->output_queue = NULL;
3568 raise_softirq_irqoff(NET_TX_SOFTIRQ);
3571 /* Process offline CPU's input_pkt_queue */
3572 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
3578 #ifdef CONFIG_NET_DMA
3580 * net_dma_rebalance -
3581 * This is called when the number of channels allocated to the net_dma_client
3582 * changes. The net_dma_client tries to have one DMA channel per CPU.
3584 static void net_dma_rebalance(void)
3586 unsigned int cpu, i, n;
3587 struct dma_chan *chan;
3589 if (net_dma_count == 0) {
3590 for_each_online_cpu(cpu)
3591 rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
3596 cpu = first_cpu(cpu_online_map);
3599 list_for_each_entry(chan, &net_dma_client->channels, client_node) {
3600 n = ((num_online_cpus() / net_dma_count)
3601 + (i < (num_online_cpus() % net_dma_count) ? 1 : 0));
3604 per_cpu(softnet_data, cpu).net_dma = chan;
3605 cpu = next_cpu(cpu, cpu_online_map);
3614 * netdev_dma_event - event callback for the net_dma_client
3615 * @client: should always be net_dma_client
3616 * @chan: DMA channel for the event
3617 * @event: event type
3619 static void netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
3620 enum dma_event event)
3622 spin_lock(&net_dma_event_lock);
3624 case DMA_RESOURCE_ADDED:
3626 net_dma_rebalance();
3628 case DMA_RESOURCE_REMOVED:
3630 net_dma_rebalance();
3635 spin_unlock(&net_dma_event_lock);
3639 * netdev_dma_regiser - register the networking subsystem as a DMA client
3641 static int __init netdev_dma_register(void)
3643 spin_lock_init(&net_dma_event_lock);
3644 net_dma_client = dma_async_client_register(netdev_dma_event);
3645 if (net_dma_client == NULL)
3648 dma_async_client_chan_request(net_dma_client, num_online_cpus());
3653 static int __init netdev_dma_register(void) { return -ENODEV; }
3654 #endif /* CONFIG_NET_DMA */
3657 * Initialize the DEV module. At boot time this walks the device list and
3658 * unhooks any devices that fail to initialise (normally hardware not
3659 * present) and leaves us with a valid list of present and active devices.
3664 * This is called single threaded during boot, so no need
3665 * to take the rtnl semaphore.
3667 static int __init net_dev_init(void)
3669 int i, rc = -ENOMEM;
3671 BUG_ON(!dev_boot_phase);
3673 if (dev_proc_init())
3676 if (netdev_sysfs_init())
3679 INIT_LIST_HEAD(&ptype_all);
3680 for (i = 0; i < 16; i++)
3681 INIT_LIST_HEAD(&ptype_base[i]);
3683 for (i = 0; i < ARRAY_SIZE(dev_name_head); i++)
3684 INIT_HLIST_HEAD(&dev_name_head[i]);
3686 for (i = 0; i < ARRAY_SIZE(dev_index_head); i++)
3687 INIT_HLIST_HEAD(&dev_index_head[i]);
3690 * Initialise the packet receive queues.
3693 for_each_possible_cpu(i) {
3694 struct softnet_data *queue;
3696 queue = &per_cpu(softnet_data, i);
3697 skb_queue_head_init(&queue->input_pkt_queue);
3698 queue->completion_queue = NULL;
3699 INIT_LIST_HEAD(&queue->poll_list);
3700 set_bit(__LINK_STATE_START, &queue->backlog_dev.state);
3701 queue->backlog_dev.weight = weight_p;
3702 queue->backlog_dev.poll = process_backlog;
3703 atomic_set(&queue->backlog_dev.refcnt, 1);
3706 netdev_dma_register();
3710 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
3711 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
3713 hotcpu_notifier(dev_cpu_callback, 0);
3721 subsys_initcall(net_dev_init);
3723 EXPORT_SYMBOL(__dev_get_by_index);
3724 EXPORT_SYMBOL(__dev_get_by_name);
3725 EXPORT_SYMBOL(__dev_remove_pack);
3726 EXPORT_SYMBOL(dev_valid_name);
3727 EXPORT_SYMBOL(dev_add_pack);
3728 EXPORT_SYMBOL(dev_alloc_name);
3729 EXPORT_SYMBOL(dev_close);
3730 EXPORT_SYMBOL(dev_get_by_flags);
3731 EXPORT_SYMBOL(dev_get_by_index);
3732 EXPORT_SYMBOL(dev_get_by_name);
3733 EXPORT_SYMBOL(dev_open);
3734 EXPORT_SYMBOL(dev_queue_xmit);
3735 EXPORT_SYMBOL(dev_remove_pack);
3736 EXPORT_SYMBOL(dev_set_allmulti);
3737 EXPORT_SYMBOL(dev_set_promiscuity);
3738 EXPORT_SYMBOL(dev_change_flags);
3739 EXPORT_SYMBOL(dev_set_mtu);
3740 EXPORT_SYMBOL(dev_set_mac_address);
3741 EXPORT_SYMBOL(free_netdev);
3742 EXPORT_SYMBOL(netdev_boot_setup_check);
3743 EXPORT_SYMBOL(netdev_set_master);
3744 EXPORT_SYMBOL(netdev_state_change);
3745 EXPORT_SYMBOL(netif_receive_skb);
3746 EXPORT_SYMBOL(netif_rx);
3747 EXPORT_SYMBOL(register_gifconf);
3748 EXPORT_SYMBOL(register_netdevice);
3749 EXPORT_SYMBOL(register_netdevice_notifier);
3750 EXPORT_SYMBOL(skb_checksum_help);
3751 EXPORT_SYMBOL(synchronize_net);
3752 EXPORT_SYMBOL(unregister_netdevice);
3753 EXPORT_SYMBOL(unregister_netdevice_notifier);
3754 EXPORT_SYMBOL(net_enable_timestamp);
3755 EXPORT_SYMBOL(net_disable_timestamp);
3756 EXPORT_SYMBOL(dev_get_flags);
3758 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
3759 EXPORT_SYMBOL(br_handle_frame_hook);
3760 EXPORT_SYMBOL(br_fdb_get_hook);
3761 EXPORT_SYMBOL(br_fdb_put_hook);
3765 EXPORT_SYMBOL(dev_load);
3768 EXPORT_PER_CPU_SYMBOL(softnet_data);