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 strcpy(s[i].name, name);
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 !strncmp(dev->name, s[i].name, strlen(s[i].name))) {
484 dev->irq = s[i].map.irq;
485 dev->base_addr = s[i].map.base_addr;
486 dev->mem_start = s[i].map.mem_start;
487 dev->mem_end = s[i].map.mem_end;
496 * netdev_boot_base - get address from boot time settings
497 * @prefix: prefix for network device
498 * @unit: id for network device
500 * Check boot time settings for the base address of device.
501 * The found settings are set for the device to be used
502 * later in the device probing.
503 * Returns 0 if no settings found.
505 unsigned long netdev_boot_base(const char *prefix, int unit)
507 const struct netdev_boot_setup *s = dev_boot_setup;
511 sprintf(name, "%s%d", prefix, unit);
514 * If device already registered then return base of 1
515 * to indicate not to probe for this interface
517 if (__dev_get_by_name(&init_net, name))
520 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
521 if (!strcmp(name, s[i].name))
522 return s[i].map.base_addr;
527 * Saves at boot time configured settings for any netdevice.
529 int __init netdev_boot_setup(char *str)
534 str = get_options(str, ARRAY_SIZE(ints), ints);
539 memset(&map, 0, sizeof(map));
543 map.base_addr = ints[2];
545 map.mem_start = ints[3];
547 map.mem_end = ints[4];
549 /* Add new entry to the list */
550 return netdev_boot_setup_add(str, &map);
553 __setup("netdev=", netdev_boot_setup);
555 /*******************************************************************************
557 Device Interface Subroutines
559 *******************************************************************************/
562 * __dev_get_by_name - find a device by its name
563 * @net: the applicable net namespace
564 * @name: name to find
566 * Find an interface by name. Must be called under RTNL semaphore
567 * or @dev_base_lock. If the name is found a pointer to the device
568 * is returned. If the name is not found then %NULL is returned. The
569 * reference counters are not incremented so the caller must be
570 * careful with locks.
573 struct net_device *__dev_get_by_name(struct net *net, const char *name)
575 struct hlist_node *p;
577 hlist_for_each(p, dev_name_hash(net, name)) {
578 struct net_device *dev
579 = hlist_entry(p, struct net_device, name_hlist);
580 if (!strncmp(dev->name, name, IFNAMSIZ))
587 * dev_get_by_name - find a device by its name
588 * @net: the applicable net namespace
589 * @name: name to find
591 * Find an interface by name. This can be called from any
592 * context and does its own locking. The returned handle has
593 * the usage count incremented and the caller must use dev_put() to
594 * release it when it is no longer needed. %NULL is returned if no
595 * matching device is found.
598 struct net_device *dev_get_by_name(struct net *net, const char *name)
600 struct net_device *dev;
602 read_lock(&dev_base_lock);
603 dev = __dev_get_by_name(net, name);
606 read_unlock(&dev_base_lock);
611 * __dev_get_by_index - find a device by its ifindex
612 * @net: the applicable net namespace
613 * @ifindex: index of device
615 * Search for an interface by index. Returns %NULL if the device
616 * is not found or a pointer to the device. The device has not
617 * had its reference counter increased so the caller must be careful
618 * about locking. The caller must hold either the RTNL semaphore
622 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
624 struct hlist_node *p;
626 hlist_for_each(p, dev_index_hash(net, ifindex)) {
627 struct net_device *dev
628 = hlist_entry(p, struct net_device, index_hlist);
629 if (dev->ifindex == ifindex)
637 * dev_get_by_index - find a device by its ifindex
638 * @net: the applicable net namespace
639 * @ifindex: index of device
641 * Search for an interface by index. Returns NULL if the device
642 * is not found or a pointer to the device. The device returned has
643 * had a reference added and the pointer is safe until the user calls
644 * dev_put to indicate they have finished with it.
647 struct net_device *dev_get_by_index(struct net *net, int ifindex)
649 struct net_device *dev;
651 read_lock(&dev_base_lock);
652 dev = __dev_get_by_index(net, ifindex);
655 read_unlock(&dev_base_lock);
660 * dev_getbyhwaddr - find a device by its hardware address
661 * @net: the applicable net namespace
662 * @type: media type of device
663 * @ha: hardware address
665 * Search for an interface by MAC address. Returns NULL if the device
666 * is not found or a pointer to the device. The caller must hold the
667 * rtnl semaphore. The returned device has not had its ref count increased
668 * and the caller must therefore be careful about locking
671 * If the API was consistent this would be __dev_get_by_hwaddr
674 struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha)
676 struct net_device *dev;
680 for_each_netdev(net, dev)
681 if (dev->type == type &&
682 !memcmp(dev->dev_addr, ha, dev->addr_len))
688 EXPORT_SYMBOL(dev_getbyhwaddr);
690 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
692 struct net_device *dev;
695 for_each_netdev(net, dev)
696 if (dev->type == type)
702 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
704 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
706 struct net_device *dev;
709 dev = __dev_getfirstbyhwtype(net, type);
716 EXPORT_SYMBOL(dev_getfirstbyhwtype);
719 * dev_get_by_flags - find any device with given flags
720 * @net: the applicable net namespace
721 * @if_flags: IFF_* values
722 * @mask: bitmask of bits in if_flags to check
724 * Search for any interface with the given flags. Returns NULL if a device
725 * is not found or a pointer to the device. The device returned has
726 * had a reference added and the pointer is safe until the user calls
727 * dev_put to indicate they have finished with it.
730 struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask)
732 struct net_device *dev, *ret;
735 read_lock(&dev_base_lock);
736 for_each_netdev(net, dev) {
737 if (((dev->flags ^ if_flags) & mask) == 0) {
743 read_unlock(&dev_base_lock);
748 * dev_valid_name - check if name is okay for network device
751 * Network device names need to be valid file names to
752 * to allow sysfs to work. We also disallow any kind of
755 int dev_valid_name(const char *name)
759 if (strlen(name) >= IFNAMSIZ)
761 if (!strcmp(name, ".") || !strcmp(name, ".."))
765 if (*name == '/' || isspace(*name))
773 * __dev_alloc_name - allocate a name for a device
774 * @net: network namespace to allocate the device name in
775 * @name: name format string
776 * @buf: scratch buffer and result name string
778 * Passed a format string - eg "lt%d" it will try and find a suitable
779 * id. It scans list of devices to build up a free map, then chooses
780 * the first empty slot. The caller must hold the dev_base or rtnl lock
781 * while allocating the name and adding the device in order to avoid
783 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
784 * Returns the number of the unit assigned or a negative errno code.
787 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
791 const int max_netdevices = 8*PAGE_SIZE;
792 unsigned long *inuse;
793 struct net_device *d;
795 p = strnchr(name, IFNAMSIZ-1, '%');
798 * Verify the string as this thing may have come from
799 * the user. There must be either one "%d" and no other "%"
802 if (p[1] != 'd' || strchr(p + 2, '%'))
805 /* Use one page as a bit array of possible slots */
806 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
810 for_each_netdev(net, d) {
811 if (!sscanf(d->name, name, &i))
813 if (i < 0 || i >= max_netdevices)
816 /* avoid cases where sscanf is not exact inverse of printf */
817 snprintf(buf, IFNAMSIZ, name, i);
818 if (!strncmp(buf, d->name, IFNAMSIZ))
822 i = find_first_zero_bit(inuse, max_netdevices);
823 free_page((unsigned long) inuse);
826 snprintf(buf, IFNAMSIZ, name, i);
827 if (!__dev_get_by_name(net, buf))
830 /* It is possible to run out of possible slots
831 * when the name is long and there isn't enough space left
832 * for the digits, or if all bits are used.
838 * dev_alloc_name - allocate a name for a device
840 * @name: name format string
842 * Passed a format string - eg "lt%d" it will try and find a suitable
843 * id. It scans list of devices to build up a free map, then chooses
844 * the first empty slot. The caller must hold the dev_base or rtnl lock
845 * while allocating the name and adding the device in order to avoid
847 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
848 * Returns the number of the unit assigned or a negative errno code.
851 int dev_alloc_name(struct net_device *dev, const char *name)
857 BUG_ON(!dev_net(dev));
859 ret = __dev_alloc_name(net, name, buf);
861 strlcpy(dev->name, buf, IFNAMSIZ);
867 * dev_change_name - change name of a device
869 * @newname: name (or format string) must be at least IFNAMSIZ
871 * Change name of a device, can pass format strings "eth%d".
874 int dev_change_name(struct net_device *dev, char *newname)
876 char oldname[IFNAMSIZ];
882 BUG_ON(!dev_net(dev));
885 if (dev->flags & IFF_UP)
888 if (!dev_valid_name(newname))
891 if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
894 memcpy(oldname, dev->name, IFNAMSIZ);
896 if (strchr(newname, '%')) {
897 err = dev_alloc_name(dev, newname);
900 strcpy(newname, dev->name);
902 else if (__dev_get_by_name(net, newname))
905 strlcpy(dev->name, newname, IFNAMSIZ);
908 err = device_rename(&dev->dev, dev->name);
910 memcpy(dev->name, oldname, IFNAMSIZ);
914 write_lock_bh(&dev_base_lock);
915 hlist_del(&dev->name_hlist);
916 hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name));
917 write_unlock_bh(&dev_base_lock);
919 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
920 ret = notifier_to_errno(ret);
925 "%s: name change rollback failed: %d.\n",
929 memcpy(dev->name, oldname, IFNAMSIZ);
938 * netdev_features_change - device changes features
939 * @dev: device to cause notification
941 * Called to indicate a device has changed features.
943 void netdev_features_change(struct net_device *dev)
945 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
947 EXPORT_SYMBOL(netdev_features_change);
950 * netdev_state_change - device changes state
951 * @dev: device to cause notification
953 * Called to indicate a device has changed state. This function calls
954 * the notifier chains for netdev_chain and sends a NEWLINK message
955 * to the routing socket.
957 void netdev_state_change(struct net_device *dev)
959 if (dev->flags & IFF_UP) {
960 call_netdevice_notifiers(NETDEV_CHANGE, dev);
961 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
965 void netdev_bonding_change(struct net_device *dev)
967 call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev);
969 EXPORT_SYMBOL(netdev_bonding_change);
972 * dev_load - load a network module
973 * @net: the applicable net namespace
974 * @name: name of interface
976 * If a network interface is not present and the process has suitable
977 * privileges this function loads the module. If module loading is not
978 * available in this kernel then it becomes a nop.
981 void dev_load(struct net *net, const char *name)
983 struct net_device *dev;
985 read_lock(&dev_base_lock);
986 dev = __dev_get_by_name(net, name);
987 read_unlock(&dev_base_lock);
989 if (!dev && capable(CAP_SYS_MODULE))
990 request_module("%s", name);
994 * dev_open - prepare an interface for use.
995 * @dev: device to open
997 * Takes a device from down to up state. The device's private open
998 * function is invoked and then the multicast lists are loaded. Finally
999 * the device is moved into the up state and a %NETDEV_UP message is
1000 * sent to the netdev notifier chain.
1002 * Calling this function on an active interface is a nop. On a failure
1003 * a negative errno code is returned.
1005 int dev_open(struct net_device *dev)
1015 if (dev->flags & IFF_UP)
1019 * Is it even present?
1021 if (!netif_device_present(dev))
1025 * Call device private open method
1027 set_bit(__LINK_STATE_START, &dev->state);
1029 if (dev->validate_addr)
1030 ret = dev->validate_addr(dev);
1032 if (!ret && dev->open)
1033 ret = dev->open(dev);
1036 * If it went open OK then:
1040 clear_bit(__LINK_STATE_START, &dev->state);
1045 dev->flags |= IFF_UP;
1048 * Initialize multicasting status
1050 dev_set_rx_mode(dev);
1053 * Wakeup transmit queue engine
1058 * ... and announce new interface.
1060 call_netdevice_notifiers(NETDEV_UP, dev);
1067 * dev_close - shutdown an interface.
1068 * @dev: device to shutdown
1070 * This function moves an active device into down state. A
1071 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1072 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1075 int dev_close(struct net_device *dev)
1081 if (!(dev->flags & IFF_UP))
1085 * Tell people we are going down, so that they can
1086 * prepare to death, when device is still operating.
1088 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1090 clear_bit(__LINK_STATE_START, &dev->state);
1092 /* Synchronize to scheduled poll. We cannot touch poll list,
1093 * it can be even on different cpu. So just clear netif_running().
1095 * dev->stop() will invoke napi_disable() on all of it's
1096 * napi_struct instances on this device.
1098 smp_mb__after_clear_bit(); /* Commit netif_running(). */
1100 dev_deactivate(dev);
1103 * Call the device specific close. This cannot fail.
1104 * Only if device is UP
1106 * We allow it to be called even after a DETACH hot-plug
1113 * Device is now down.
1116 dev->flags &= ~IFF_UP;
1119 * Tell people we are down
1121 call_netdevice_notifiers(NETDEV_DOWN, dev);
1128 * dev_disable_lro - disable Large Receive Offload on a device
1131 * Disable Large Receive Offload (LRO) on a net device. Must be
1132 * called under RTNL. This is needed if received packets may be
1133 * forwarded to another interface.
1135 void dev_disable_lro(struct net_device *dev)
1137 if (dev->ethtool_ops && dev->ethtool_ops->get_flags &&
1138 dev->ethtool_ops->set_flags) {
1139 u32 flags = dev->ethtool_ops->get_flags(dev);
1140 if (flags & ETH_FLAG_LRO) {
1141 flags &= ~ETH_FLAG_LRO;
1142 dev->ethtool_ops->set_flags(dev, flags);
1145 WARN_ON(dev->features & NETIF_F_LRO);
1147 EXPORT_SYMBOL(dev_disable_lro);
1150 static int dev_boot_phase = 1;
1153 * Device change register/unregister. These are not inline or static
1154 * as we export them to the world.
1158 * register_netdevice_notifier - register a network notifier block
1161 * Register a notifier to be called when network device events occur.
1162 * The notifier passed is linked into the kernel structures and must
1163 * not be reused until it has been unregistered. A negative errno code
1164 * is returned on a failure.
1166 * When registered all registration and up events are replayed
1167 * to the new notifier to allow device to have a race free
1168 * view of the network device list.
1171 int register_netdevice_notifier(struct notifier_block *nb)
1173 struct net_device *dev;
1174 struct net_device *last;
1179 err = raw_notifier_chain_register(&netdev_chain, nb);
1185 for_each_netdev(net, dev) {
1186 err = nb->notifier_call(nb, NETDEV_REGISTER, dev);
1187 err = notifier_to_errno(err);
1191 if (!(dev->flags & IFF_UP))
1194 nb->notifier_call(nb, NETDEV_UP, dev);
1205 for_each_netdev(net, dev) {
1209 if (dev->flags & IFF_UP) {
1210 nb->notifier_call(nb, NETDEV_GOING_DOWN, dev);
1211 nb->notifier_call(nb, NETDEV_DOWN, dev);
1213 nb->notifier_call(nb, NETDEV_UNREGISTER, dev);
1217 raw_notifier_chain_unregister(&netdev_chain, nb);
1222 * unregister_netdevice_notifier - unregister a network notifier block
1225 * Unregister a notifier previously registered by
1226 * register_netdevice_notifier(). The notifier is unlinked into the
1227 * kernel structures and may then be reused. A negative errno code
1228 * is returned on a failure.
1231 int unregister_netdevice_notifier(struct notifier_block *nb)
1236 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1242 * call_netdevice_notifiers - call all network notifier blocks
1243 * @val: value passed unmodified to notifier function
1244 * @dev: net_device pointer passed unmodified to notifier function
1246 * Call all network notifier blocks. Parameters and return value
1247 * are as for raw_notifier_call_chain().
1250 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1252 return raw_notifier_call_chain(&netdev_chain, val, dev);
1255 /* When > 0 there are consumers of rx skb time stamps */
1256 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1258 void net_enable_timestamp(void)
1260 atomic_inc(&netstamp_needed);
1263 void net_disable_timestamp(void)
1265 atomic_dec(&netstamp_needed);
1268 static inline void net_timestamp(struct sk_buff *skb)
1270 if (atomic_read(&netstamp_needed))
1271 __net_timestamp(skb);
1273 skb->tstamp.tv64 = 0;
1277 * Support routine. Sends outgoing frames to any network
1278 * taps currently in use.
1281 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1283 struct packet_type *ptype;
1288 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1289 /* Never send packets back to the socket
1290 * they originated from - MvS (miquels@drinkel.ow.org)
1292 if ((ptype->dev == dev || !ptype->dev) &&
1293 (ptype->af_packet_priv == NULL ||
1294 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1295 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1299 /* skb->nh should be correctly
1300 set by sender, so that the second statement is
1301 just protection against buggy protocols.
1303 skb_reset_mac_header(skb2);
1305 if (skb_network_header(skb2) < skb2->data ||
1306 skb2->network_header > skb2->tail) {
1307 if (net_ratelimit())
1308 printk(KERN_CRIT "protocol %04x is "
1310 skb2->protocol, dev->name);
1311 skb_reset_network_header(skb2);
1314 skb2->transport_header = skb2->network_header;
1315 skb2->pkt_type = PACKET_OUTGOING;
1316 ptype->func(skb2, skb->dev, ptype, skb->dev);
1323 void __netif_schedule(struct net_device *dev)
1325 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
1326 unsigned long flags;
1327 struct softnet_data *sd;
1329 local_irq_save(flags);
1330 sd = &__get_cpu_var(softnet_data);
1331 dev->next_sched = sd->output_queue;
1332 sd->output_queue = dev;
1333 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1334 local_irq_restore(flags);
1337 EXPORT_SYMBOL(__netif_schedule);
1339 void dev_kfree_skb_irq(struct sk_buff *skb)
1341 if (atomic_dec_and_test(&skb->users)) {
1342 struct softnet_data *sd;
1343 unsigned long flags;
1345 local_irq_save(flags);
1346 sd = &__get_cpu_var(softnet_data);
1347 skb->next = sd->completion_queue;
1348 sd->completion_queue = skb;
1349 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1350 local_irq_restore(flags);
1353 EXPORT_SYMBOL(dev_kfree_skb_irq);
1355 void dev_kfree_skb_any(struct sk_buff *skb)
1357 if (in_irq() || irqs_disabled())
1358 dev_kfree_skb_irq(skb);
1362 EXPORT_SYMBOL(dev_kfree_skb_any);
1366 * netif_device_detach - mark device as removed
1367 * @dev: network device
1369 * Mark device as removed from system and therefore no longer available.
1371 void netif_device_detach(struct net_device *dev)
1373 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1374 netif_running(dev)) {
1375 netif_stop_queue(dev);
1378 EXPORT_SYMBOL(netif_device_detach);
1381 * netif_device_attach - mark device as attached
1382 * @dev: network device
1384 * Mark device as attached from system and restart if needed.
1386 void netif_device_attach(struct net_device *dev)
1388 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1389 netif_running(dev)) {
1390 netif_wake_queue(dev);
1391 __netdev_watchdog_up(dev);
1394 EXPORT_SYMBOL(netif_device_attach);
1396 static bool can_checksum_protocol(unsigned long features, __be16 protocol)
1398 return ((features & NETIF_F_GEN_CSUM) ||
1399 ((features & NETIF_F_IP_CSUM) &&
1400 protocol == htons(ETH_P_IP)) ||
1401 ((features & NETIF_F_IPV6_CSUM) &&
1402 protocol == htons(ETH_P_IPV6)));
1405 static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb)
1407 if (can_checksum_protocol(dev->features, skb->protocol))
1410 if (skb->protocol == htons(ETH_P_8021Q)) {
1411 struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data;
1412 if (can_checksum_protocol(dev->features & dev->vlan_features,
1413 veh->h_vlan_encapsulated_proto))
1421 * Invalidate hardware checksum when packet is to be mangled, and
1422 * complete checksum manually on outgoing path.
1424 int skb_checksum_help(struct sk_buff *skb)
1427 int ret = 0, offset;
1429 if (skb->ip_summed == CHECKSUM_COMPLETE)
1430 goto out_set_summed;
1432 if (unlikely(skb_shinfo(skb)->gso_size)) {
1433 /* Let GSO fix up the checksum. */
1434 goto out_set_summed;
1437 offset = skb->csum_start - skb_headroom(skb);
1438 BUG_ON(offset >= skb_headlen(skb));
1439 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1441 offset += skb->csum_offset;
1442 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
1444 if (skb_cloned(skb) &&
1445 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
1446 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1451 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1453 skb->ip_summed = CHECKSUM_NONE;
1459 * skb_gso_segment - Perform segmentation on skb.
1460 * @skb: buffer to segment
1461 * @features: features for the output path (see dev->features)
1463 * This function segments the given skb and returns a list of segments.
1465 * It may return NULL if the skb requires no segmentation. This is
1466 * only possible when GSO is used for verifying header integrity.
1468 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1470 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1471 struct packet_type *ptype;
1472 __be16 type = skb->protocol;
1475 BUG_ON(skb_shinfo(skb)->frag_list);
1477 skb_reset_mac_header(skb);
1478 skb->mac_len = skb->network_header - skb->mac_header;
1479 __skb_pull(skb, skb->mac_len);
1481 if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) {
1482 if (skb_header_cloned(skb) &&
1483 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1484 return ERR_PTR(err);
1488 list_for_each_entry_rcu(ptype,
1489 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
1490 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1491 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1492 err = ptype->gso_send_check(skb);
1493 segs = ERR_PTR(err);
1494 if (err || skb_gso_ok(skb, features))
1496 __skb_push(skb, (skb->data -
1497 skb_network_header(skb)));
1499 segs = ptype->gso_segment(skb, features);
1505 __skb_push(skb, skb->data - skb_mac_header(skb));
1510 EXPORT_SYMBOL(skb_gso_segment);
1512 /* Take action when hardware reception checksum errors are detected. */
1514 void netdev_rx_csum_fault(struct net_device *dev)
1516 if (net_ratelimit()) {
1517 printk(KERN_ERR "%s: hw csum failure.\n",
1518 dev ? dev->name : "<unknown>");
1522 EXPORT_SYMBOL(netdev_rx_csum_fault);
1525 /* Actually, we should eliminate this check as soon as we know, that:
1526 * 1. IOMMU is present and allows to map all the memory.
1527 * 2. No high memory really exists on this machine.
1530 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1532 #ifdef CONFIG_HIGHMEM
1535 if (dev->features & NETIF_F_HIGHDMA)
1538 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1539 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1547 void (*destructor)(struct sk_buff *skb);
1550 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1552 static void dev_gso_skb_destructor(struct sk_buff *skb)
1554 struct dev_gso_cb *cb;
1557 struct sk_buff *nskb = skb->next;
1559 skb->next = nskb->next;
1562 } while (skb->next);
1564 cb = DEV_GSO_CB(skb);
1566 cb->destructor(skb);
1570 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1571 * @skb: buffer to segment
1573 * This function segments the given skb and stores the list of segments
1576 static int dev_gso_segment(struct sk_buff *skb)
1578 struct net_device *dev = skb->dev;
1579 struct sk_buff *segs;
1580 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1583 segs = skb_gso_segment(skb, features);
1585 /* Verifying header integrity only. */
1590 return PTR_ERR(segs);
1593 DEV_GSO_CB(skb)->destructor = skb->destructor;
1594 skb->destructor = dev_gso_skb_destructor;
1599 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
1601 if (likely(!skb->next)) {
1602 if (!list_empty(&ptype_all))
1603 dev_queue_xmit_nit(skb, dev);
1605 if (netif_needs_gso(dev, skb)) {
1606 if (unlikely(dev_gso_segment(skb)))
1612 return dev->hard_start_xmit(skb, dev);
1617 struct sk_buff *nskb = skb->next;
1620 skb->next = nskb->next;
1622 rc = dev->hard_start_xmit(nskb, dev);
1624 nskb->next = skb->next;
1628 if (unlikely((netif_queue_stopped(dev) ||
1629 netif_subqueue_stopped(dev, skb)) &&
1631 return NETDEV_TX_BUSY;
1632 } while (skb->next);
1634 skb->destructor = DEV_GSO_CB(skb)->destructor;
1642 * dev_queue_xmit - transmit a buffer
1643 * @skb: buffer to transmit
1645 * Queue a buffer for transmission to a network device. The caller must
1646 * have set the device and priority and built the buffer before calling
1647 * this function. The function can be called from an interrupt.
1649 * A negative errno code is returned on a failure. A success does not
1650 * guarantee the frame will be transmitted as it may be dropped due
1651 * to congestion or traffic shaping.
1653 * -----------------------------------------------------------------------------------
1654 * I notice this method can also return errors from the queue disciplines,
1655 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1658 * Regardless of the return value, the skb is consumed, so it is currently
1659 * difficult to retry a send to this method. (You can bump the ref count
1660 * before sending to hold a reference for retry if you are careful.)
1662 * When calling this method, interrupts MUST be enabled. This is because
1663 * the BH enable code must have IRQs enabled so that it will not deadlock.
1667 int dev_queue_xmit(struct sk_buff *skb)
1669 struct net_device *dev = skb->dev;
1673 /* GSO will handle the following emulations directly. */
1674 if (netif_needs_gso(dev, skb))
1677 if (skb_shinfo(skb)->frag_list &&
1678 !(dev->features & NETIF_F_FRAGLIST) &&
1679 __skb_linearize(skb))
1682 /* Fragmented skb is linearized if device does not support SG,
1683 * or if at least one of fragments is in highmem and device
1684 * does not support DMA from it.
1686 if (skb_shinfo(skb)->nr_frags &&
1687 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1688 __skb_linearize(skb))
1691 /* If packet is not checksummed and device does not support
1692 * checksumming for this protocol, complete checksumming here.
1694 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1695 skb_set_transport_header(skb, skb->csum_start -
1697 if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb))
1702 spin_lock_prefetch(&dev->queue_lock);
1704 /* Disable soft irqs for various locks below. Also
1705 * stops preemption for RCU.
1709 /* Updates of qdisc are serialized by queue_lock.
1710 * The struct Qdisc which is pointed to by qdisc is now a
1711 * rcu structure - it may be accessed without acquiring
1712 * a lock (but the structure may be stale.) The freeing of the
1713 * qdisc will be deferred until it's known that there are no
1714 * more references to it.
1716 * If the qdisc has an enqueue function, we still need to
1717 * hold the queue_lock before calling it, since queue_lock
1718 * also serializes access to the device queue.
1721 q = rcu_dereference(dev->qdisc);
1722 #ifdef CONFIG_NET_CLS_ACT
1723 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1726 /* Grab device queue */
1727 spin_lock(&dev->queue_lock);
1730 /* reset queue_mapping to zero */
1731 skb_set_queue_mapping(skb, 0);
1732 rc = q->enqueue(skb, q);
1734 spin_unlock(&dev->queue_lock);
1736 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1739 spin_unlock(&dev->queue_lock);
1742 /* The device has no queue. Common case for software devices:
1743 loopback, all the sorts of tunnels...
1745 Really, it is unlikely that netif_tx_lock protection is necessary
1746 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1748 However, it is possible, that they rely on protection
1751 Check this and shot the lock. It is not prone from deadlocks.
1752 Either shot noqueue qdisc, it is even simpler 8)
1754 if (dev->flags & IFF_UP) {
1755 int cpu = smp_processor_id(); /* ok because BHs are off */
1757 if (dev->xmit_lock_owner != cpu) {
1759 HARD_TX_LOCK(dev, cpu);
1761 if (!netif_queue_stopped(dev) &&
1762 !netif_subqueue_stopped(dev, skb)) {
1764 if (!dev_hard_start_xmit(skb, dev)) {
1765 HARD_TX_UNLOCK(dev);
1769 HARD_TX_UNLOCK(dev);
1770 if (net_ratelimit())
1771 printk(KERN_CRIT "Virtual device %s asks to "
1772 "queue packet!\n", dev->name);
1774 /* Recursion is detected! It is possible,
1776 if (net_ratelimit())
1777 printk(KERN_CRIT "Dead loop on virtual device "
1778 "%s, fix it urgently!\n", dev->name);
1783 rcu_read_unlock_bh();
1789 rcu_read_unlock_bh();
1794 /*=======================================================================
1796 =======================================================================*/
1798 int netdev_max_backlog __read_mostly = 1000;
1799 int netdev_budget __read_mostly = 300;
1800 int weight_p __read_mostly = 64; /* old backlog weight */
1802 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1806 * netif_rx - post buffer to the network code
1807 * @skb: buffer to post
1809 * This function receives a packet from a device driver and queues it for
1810 * the upper (protocol) levels to process. It always succeeds. The buffer
1811 * may be dropped during processing for congestion control or by the
1815 * NET_RX_SUCCESS (no congestion)
1816 * NET_RX_DROP (packet was dropped)
1820 int netif_rx(struct sk_buff *skb)
1822 struct softnet_data *queue;
1823 unsigned long flags;
1825 /* if netpoll wants it, pretend we never saw it */
1826 if (netpoll_rx(skb))
1829 if (!skb->tstamp.tv64)
1833 * The code is rearranged so that the path is the most
1834 * short when CPU is congested, but is still operating.
1836 local_irq_save(flags);
1837 queue = &__get_cpu_var(softnet_data);
1839 __get_cpu_var(netdev_rx_stat).total++;
1840 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1841 if (queue->input_pkt_queue.qlen) {
1844 __skb_queue_tail(&queue->input_pkt_queue, skb);
1845 local_irq_restore(flags);
1846 return NET_RX_SUCCESS;
1849 napi_schedule(&queue->backlog);
1853 __get_cpu_var(netdev_rx_stat).dropped++;
1854 local_irq_restore(flags);
1860 int netif_rx_ni(struct sk_buff *skb)
1865 err = netif_rx(skb);
1866 if (local_softirq_pending())
1873 EXPORT_SYMBOL(netif_rx_ni);
1875 static inline struct net_device *skb_bond(struct sk_buff *skb)
1877 struct net_device *dev = skb->dev;
1880 if (skb_bond_should_drop(skb)) {
1884 skb->dev = dev->master;
1891 static void net_tx_action(struct softirq_action *h)
1893 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1895 if (sd->completion_queue) {
1896 struct sk_buff *clist;
1898 local_irq_disable();
1899 clist = sd->completion_queue;
1900 sd->completion_queue = NULL;
1904 struct sk_buff *skb = clist;
1905 clist = clist->next;
1907 BUG_TRAP(!atomic_read(&skb->users));
1912 if (sd->output_queue) {
1913 struct net_device *head;
1915 local_irq_disable();
1916 head = sd->output_queue;
1917 sd->output_queue = NULL;
1921 struct net_device *dev = head;
1922 head = head->next_sched;
1924 smp_mb__before_clear_bit();
1925 clear_bit(__LINK_STATE_SCHED, &dev->state);
1927 if (spin_trylock(&dev->queue_lock)) {
1929 spin_unlock(&dev->queue_lock);
1931 netif_schedule(dev);
1937 static inline int deliver_skb(struct sk_buff *skb,
1938 struct packet_type *pt_prev,
1939 struct net_device *orig_dev)
1941 atomic_inc(&skb->users);
1942 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1945 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1946 /* These hooks defined here for ATM */
1948 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1949 unsigned char *addr);
1950 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
1953 * If bridge module is loaded call bridging hook.
1954 * returns NULL if packet was consumed.
1956 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
1957 struct sk_buff *skb) __read_mostly;
1958 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
1959 struct packet_type **pt_prev, int *ret,
1960 struct net_device *orig_dev)
1962 struct net_bridge_port *port;
1964 if (skb->pkt_type == PACKET_LOOPBACK ||
1965 (port = rcu_dereference(skb->dev->br_port)) == NULL)
1969 *ret = deliver_skb(skb, *pt_prev, orig_dev);
1973 return br_handle_frame_hook(port, skb);
1976 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
1979 #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE)
1980 struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly;
1981 EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook);
1983 static inline struct sk_buff *handle_macvlan(struct sk_buff *skb,
1984 struct packet_type **pt_prev,
1986 struct net_device *orig_dev)
1988 if (skb->dev->macvlan_port == NULL)
1992 *ret = deliver_skb(skb, *pt_prev, orig_dev);
1995 return macvlan_handle_frame_hook(skb);
1998 #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb)
2001 #ifdef CONFIG_NET_CLS_ACT
2002 /* TODO: Maybe we should just force sch_ingress to be compiled in
2003 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
2004 * a compare and 2 stores extra right now if we dont have it on
2005 * but have CONFIG_NET_CLS_ACT
2006 * NOTE: This doesnt stop any functionality; if you dont have
2007 * the ingress scheduler, you just cant add policies on ingress.
2010 static int ing_filter(struct sk_buff *skb)
2013 struct net_device *dev = skb->dev;
2014 int result = TC_ACT_OK;
2015 u32 ttl = G_TC_RTTL(skb->tc_verd);
2017 if (MAX_RED_LOOP < ttl++) {
2019 "Redir loop detected Dropping packet (%d->%d)\n",
2020 skb->iif, dev->ifindex);
2024 skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl);
2025 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
2027 spin_lock(&dev->ingress_lock);
2028 if ((q = dev->qdisc_ingress) != NULL)
2029 result = q->enqueue(skb, q);
2030 spin_unlock(&dev->ingress_lock);
2035 static inline struct sk_buff *handle_ing(struct sk_buff *skb,
2036 struct packet_type **pt_prev,
2037 int *ret, struct net_device *orig_dev)
2039 if (!skb->dev->qdisc_ingress)
2043 *ret = deliver_skb(skb, *pt_prev, orig_dev);
2046 /* Huh? Why does turning on AF_PACKET affect this? */
2047 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
2050 switch (ing_filter(skb)) {
2064 * netif_receive_skb - process receive buffer from network
2065 * @skb: buffer to process
2067 * netif_receive_skb() is the main receive data processing function.
2068 * It always succeeds. The buffer may be dropped during processing
2069 * for congestion control or by the protocol layers.
2071 * This function may only be called from softirq context and interrupts
2072 * should be enabled.
2074 * Return values (usually ignored):
2075 * NET_RX_SUCCESS: no congestion
2076 * NET_RX_DROP: packet was dropped
2078 int netif_receive_skb(struct sk_buff *skb)
2080 struct packet_type *ptype, *pt_prev;
2081 struct net_device *orig_dev;
2082 int ret = NET_RX_DROP;
2085 /* if we've gotten here through NAPI, check netpoll */
2086 if (netpoll_receive_skb(skb))
2089 if (!skb->tstamp.tv64)
2093 skb->iif = skb->dev->ifindex;
2095 orig_dev = skb_bond(skb);
2100 __get_cpu_var(netdev_rx_stat).total++;
2102 skb_reset_network_header(skb);
2103 skb_reset_transport_header(skb);
2104 skb->mac_len = skb->network_header - skb->mac_header;
2110 #ifdef CONFIG_NET_CLS_ACT
2111 if (skb->tc_verd & TC_NCLS) {
2112 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
2117 list_for_each_entry_rcu(ptype, &ptype_all, list) {
2118 if (!ptype->dev || ptype->dev == skb->dev) {
2120 ret = deliver_skb(skb, pt_prev, orig_dev);
2125 #ifdef CONFIG_NET_CLS_ACT
2126 skb = handle_ing(skb, &pt_prev, &ret, orig_dev);
2132 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
2135 skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev);
2139 type = skb->protocol;
2140 list_for_each_entry_rcu(ptype,
2141 &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) {
2142 if (ptype->type == type &&
2143 (!ptype->dev || ptype->dev == skb->dev)) {
2145 ret = deliver_skb(skb, pt_prev, orig_dev);
2151 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
2154 /* Jamal, now you will not able to escape explaining
2155 * me how you were going to use this. :-)
2165 static int process_backlog(struct napi_struct *napi, int quota)
2168 struct softnet_data *queue = &__get_cpu_var(softnet_data);
2169 unsigned long start_time = jiffies;
2171 napi->weight = weight_p;
2173 struct sk_buff *skb;
2174 struct net_device *dev;
2176 local_irq_disable();
2177 skb = __skb_dequeue(&queue->input_pkt_queue);
2179 __napi_complete(napi);
2188 netif_receive_skb(skb);
2191 } while (++work < quota && jiffies == start_time);
2197 * __napi_schedule - schedule for receive
2198 * @n: entry to schedule
2200 * The entry's receive function will be scheduled to run
2202 void __napi_schedule(struct napi_struct *n)
2204 unsigned long flags;
2206 local_irq_save(flags);
2207 list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list);
2208 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2209 local_irq_restore(flags);
2211 EXPORT_SYMBOL(__napi_schedule);
2214 static void net_rx_action(struct softirq_action *h)
2216 struct list_head *list = &__get_cpu_var(softnet_data).poll_list;
2217 unsigned long start_time = jiffies;
2218 int budget = netdev_budget;
2221 local_irq_disable();
2223 while (!list_empty(list)) {
2224 struct napi_struct *n;
2227 /* If softirq window is exhuasted then punt.
2229 * Note that this is a slight policy change from the
2230 * previous NAPI code, which would allow up to 2
2231 * jiffies to pass before breaking out. The test
2232 * used to be "jiffies - start_time > 1".
2234 if (unlikely(budget <= 0 || jiffies != start_time))
2239 /* Even though interrupts have been re-enabled, this
2240 * access is safe because interrupts can only add new
2241 * entries to the tail of this list, and only ->poll()
2242 * calls can remove this head entry from the list.
2244 n = list_entry(list->next, struct napi_struct, poll_list);
2246 have = netpoll_poll_lock(n);
2250 /* This NAPI_STATE_SCHED test is for avoiding a race
2251 * with netpoll's poll_napi(). Only the entity which
2252 * obtains the lock and sees NAPI_STATE_SCHED set will
2253 * actually make the ->poll() call. Therefore we avoid
2254 * accidently calling ->poll() when NAPI is not scheduled.
2257 if (test_bit(NAPI_STATE_SCHED, &n->state))
2258 work = n->poll(n, weight);
2260 WARN_ON_ONCE(work > weight);
2264 local_irq_disable();
2266 /* Drivers must not modify the NAPI state if they
2267 * consume the entire weight. In such cases this code
2268 * still "owns" the NAPI instance and therefore can
2269 * move the instance around on the list at-will.
2271 if (unlikely(work == weight)) {
2272 if (unlikely(napi_disable_pending(n)))
2275 list_move_tail(&n->poll_list, list);
2278 netpoll_poll_unlock(have);
2283 #ifdef CONFIG_NET_DMA
2285 * There may not be any more sk_buffs coming right now, so push
2286 * any pending DMA copies to hardware
2288 if (!cpus_empty(net_dma.channel_mask)) {
2290 for_each_cpu_mask(chan_idx, net_dma.channel_mask) {
2291 struct dma_chan *chan = net_dma.channels[chan_idx];
2293 dma_async_memcpy_issue_pending(chan);
2301 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2302 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2306 static gifconf_func_t * gifconf_list [NPROTO];
2309 * register_gifconf - register a SIOCGIF handler
2310 * @family: Address family
2311 * @gifconf: Function handler
2313 * Register protocol dependent address dumping routines. The handler
2314 * that is passed must not be freed or reused until it has been replaced
2315 * by another handler.
2317 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
2319 if (family >= NPROTO)
2321 gifconf_list[family] = gifconf;
2327 * Map an interface index to its name (SIOCGIFNAME)
2331 * We need this ioctl for efficient implementation of the
2332 * if_indextoname() function required by the IPv6 API. Without
2333 * it, we would have to search all the interfaces to find a
2337 static int dev_ifname(struct net *net, struct ifreq __user *arg)
2339 struct net_device *dev;
2343 * Fetch the caller's info block.
2346 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2349 read_lock(&dev_base_lock);
2350 dev = __dev_get_by_index(net, ifr.ifr_ifindex);
2352 read_unlock(&dev_base_lock);
2356 strcpy(ifr.ifr_name, dev->name);
2357 read_unlock(&dev_base_lock);
2359 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2365 * Perform a SIOCGIFCONF call. This structure will change
2366 * size eventually, and there is nothing I can do about it.
2367 * Thus we will need a 'compatibility mode'.
2370 static int dev_ifconf(struct net *net, char __user *arg)
2373 struct net_device *dev;
2380 * Fetch the caller's info block.
2383 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2390 * Loop over the interfaces, and write an info block for each.
2394 for_each_netdev(net, dev) {
2395 for (i = 0; i < NPROTO; i++) {
2396 if (gifconf_list[i]) {
2399 done = gifconf_list[i](dev, NULL, 0);
2401 done = gifconf_list[i](dev, pos + total,
2411 * All done. Write the updated control block back to the caller.
2413 ifc.ifc_len = total;
2416 * Both BSD and Solaris return 0 here, so we do too.
2418 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2421 #ifdef CONFIG_PROC_FS
2423 * This is invoked by the /proc filesystem handler to display a device
2426 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2427 __acquires(dev_base_lock)
2429 struct net *net = seq_file_net(seq);
2431 struct net_device *dev;
2433 read_lock(&dev_base_lock);
2435 return SEQ_START_TOKEN;
2438 for_each_netdev(net, dev)
2445 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2447 struct net *net = seq_file_net(seq);
2449 return v == SEQ_START_TOKEN ?
2450 first_net_device(net) : next_net_device((struct net_device *)v);
2453 void dev_seq_stop(struct seq_file *seq, void *v)
2454 __releases(dev_base_lock)
2456 read_unlock(&dev_base_lock);
2459 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2461 struct net_device_stats *stats = dev->get_stats(dev);
2463 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2464 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2465 dev->name, stats->rx_bytes, stats->rx_packets,
2467 stats->rx_dropped + stats->rx_missed_errors,
2468 stats->rx_fifo_errors,
2469 stats->rx_length_errors + stats->rx_over_errors +
2470 stats->rx_crc_errors + stats->rx_frame_errors,
2471 stats->rx_compressed, stats->multicast,
2472 stats->tx_bytes, stats->tx_packets,
2473 stats->tx_errors, stats->tx_dropped,
2474 stats->tx_fifo_errors, stats->collisions,
2475 stats->tx_carrier_errors +
2476 stats->tx_aborted_errors +
2477 stats->tx_window_errors +
2478 stats->tx_heartbeat_errors,
2479 stats->tx_compressed);
2483 * Called from the PROCfs module. This now uses the new arbitrary sized
2484 * /proc/net interface to create /proc/net/dev
2486 static int dev_seq_show(struct seq_file *seq, void *v)
2488 if (v == SEQ_START_TOKEN)
2489 seq_puts(seq, "Inter-| Receive "
2491 " face |bytes packets errs drop fifo frame "
2492 "compressed multicast|bytes packets errs "
2493 "drop fifo colls carrier compressed\n");
2495 dev_seq_printf_stats(seq, v);
2499 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2501 struct netif_rx_stats *rc = NULL;
2503 while (*pos < nr_cpu_ids)
2504 if (cpu_online(*pos)) {
2505 rc = &per_cpu(netdev_rx_stat, *pos);
2512 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2514 return softnet_get_online(pos);
2517 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2520 return softnet_get_online(pos);
2523 static void softnet_seq_stop(struct seq_file *seq, void *v)
2527 static int softnet_seq_show(struct seq_file *seq, void *v)
2529 struct netif_rx_stats *s = v;
2531 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2532 s->total, s->dropped, s->time_squeeze, 0,
2533 0, 0, 0, 0, /* was fastroute */
2538 static const struct seq_operations dev_seq_ops = {
2539 .start = dev_seq_start,
2540 .next = dev_seq_next,
2541 .stop = dev_seq_stop,
2542 .show = dev_seq_show,
2545 static int dev_seq_open(struct inode *inode, struct file *file)
2547 return seq_open_net(inode, file, &dev_seq_ops,
2548 sizeof(struct seq_net_private));
2551 static const struct file_operations dev_seq_fops = {
2552 .owner = THIS_MODULE,
2553 .open = dev_seq_open,
2555 .llseek = seq_lseek,
2556 .release = seq_release_net,
2559 static const struct seq_operations softnet_seq_ops = {
2560 .start = softnet_seq_start,
2561 .next = softnet_seq_next,
2562 .stop = softnet_seq_stop,
2563 .show = softnet_seq_show,
2566 static int softnet_seq_open(struct inode *inode, struct file *file)
2568 return seq_open(file, &softnet_seq_ops);
2571 static const struct file_operations softnet_seq_fops = {
2572 .owner = THIS_MODULE,
2573 .open = softnet_seq_open,
2575 .llseek = seq_lseek,
2576 .release = seq_release,
2579 static void *ptype_get_idx(loff_t pos)
2581 struct packet_type *pt = NULL;
2585 list_for_each_entry_rcu(pt, &ptype_all, list) {
2591 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
2592 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
2601 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
2605 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
2608 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2610 struct packet_type *pt;
2611 struct list_head *nxt;
2615 if (v == SEQ_START_TOKEN)
2616 return ptype_get_idx(0);
2619 nxt = pt->list.next;
2620 if (pt->type == htons(ETH_P_ALL)) {
2621 if (nxt != &ptype_all)
2624 nxt = ptype_base[0].next;
2626 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
2628 while (nxt == &ptype_base[hash]) {
2629 if (++hash >= PTYPE_HASH_SIZE)
2631 nxt = ptype_base[hash].next;
2634 return list_entry(nxt, struct packet_type, list);
2637 static void ptype_seq_stop(struct seq_file *seq, void *v)
2643 static void ptype_seq_decode(struct seq_file *seq, void *sym)
2645 #ifdef CONFIG_KALLSYMS
2646 unsigned long offset = 0, symsize;
2647 const char *symname;
2651 symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset,
2658 modname = delim = "";
2659 seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim,
2665 seq_printf(seq, "[%p]", sym);
2668 static int ptype_seq_show(struct seq_file *seq, void *v)
2670 struct packet_type *pt = v;
2672 if (v == SEQ_START_TOKEN)
2673 seq_puts(seq, "Type Device Function\n");
2674 else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
2675 if (pt->type == htons(ETH_P_ALL))
2676 seq_puts(seq, "ALL ");
2678 seq_printf(seq, "%04x", ntohs(pt->type));
2680 seq_printf(seq, " %-8s ",
2681 pt->dev ? pt->dev->name : "");
2682 ptype_seq_decode(seq, pt->func);
2683 seq_putc(seq, '\n');
2689 static const struct seq_operations ptype_seq_ops = {
2690 .start = ptype_seq_start,
2691 .next = ptype_seq_next,
2692 .stop = ptype_seq_stop,
2693 .show = ptype_seq_show,
2696 static int ptype_seq_open(struct inode *inode, struct file *file)
2698 return seq_open_net(inode, file, &ptype_seq_ops,
2699 sizeof(struct seq_net_private));
2702 static const struct file_operations ptype_seq_fops = {
2703 .owner = THIS_MODULE,
2704 .open = ptype_seq_open,
2706 .llseek = seq_lseek,
2707 .release = seq_release_net,
2711 static int __net_init dev_proc_net_init(struct net *net)
2715 if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops))
2717 if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops))
2719 if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops))
2722 if (wext_proc_init(net))
2728 proc_net_remove(net, "ptype");
2730 proc_net_remove(net, "softnet_stat");
2732 proc_net_remove(net, "dev");
2736 static void __net_exit dev_proc_net_exit(struct net *net)
2738 wext_proc_exit(net);
2740 proc_net_remove(net, "ptype");
2741 proc_net_remove(net, "softnet_stat");
2742 proc_net_remove(net, "dev");
2745 static struct pernet_operations __net_initdata dev_proc_ops = {
2746 .init = dev_proc_net_init,
2747 .exit = dev_proc_net_exit,
2750 static int __init dev_proc_init(void)
2752 return register_pernet_subsys(&dev_proc_ops);
2755 #define dev_proc_init() 0
2756 #endif /* CONFIG_PROC_FS */
2760 * netdev_set_master - set up master/slave pair
2761 * @slave: slave device
2762 * @master: new master device
2764 * Changes the master device of the slave. Pass %NULL to break the
2765 * bonding. The caller must hold the RTNL semaphore. On a failure
2766 * a negative errno code is returned. On success the reference counts
2767 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2768 * function returns zero.
2770 int netdev_set_master(struct net_device *slave, struct net_device *master)
2772 struct net_device *old = slave->master;
2782 slave->master = master;
2790 slave->flags |= IFF_SLAVE;
2792 slave->flags &= ~IFF_SLAVE;
2794 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2798 static int __dev_set_promiscuity(struct net_device *dev, int inc)
2800 unsigned short old_flags = dev->flags;
2804 dev->flags |= IFF_PROMISC;
2805 dev->promiscuity += inc;
2806 if (dev->promiscuity == 0) {
2809 * If inc causes overflow, untouch promisc and return error.
2812 dev->flags &= ~IFF_PROMISC;
2814 dev->promiscuity -= inc;
2815 printk(KERN_WARNING "%s: promiscuity touches roof, "
2816 "set promiscuity failed, promiscuity feature "
2817 "of device might be broken.\n", dev->name);
2821 if (dev->flags != old_flags) {
2822 printk(KERN_INFO "device %s %s promiscuous mode\n",
2823 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2826 audit_log(current->audit_context, GFP_ATOMIC,
2827 AUDIT_ANOM_PROMISCUOUS,
2828 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
2829 dev->name, (dev->flags & IFF_PROMISC),
2830 (old_flags & IFF_PROMISC),
2831 audit_get_loginuid(current),
2832 current->uid, current->gid,
2833 audit_get_sessionid(current));
2835 if (dev->change_rx_flags)
2836 dev->change_rx_flags(dev, IFF_PROMISC);
2842 * dev_set_promiscuity - update promiscuity count on a device
2846 * Add or remove promiscuity from a device. While the count in the device
2847 * remains above zero the interface remains promiscuous. Once it hits zero
2848 * the device reverts back to normal filtering operation. A negative inc
2849 * value is used to drop promiscuity on the device.
2850 * Return 0 if successful or a negative errno code on error.
2852 int dev_set_promiscuity(struct net_device *dev, int inc)
2854 unsigned short old_flags = dev->flags;
2857 err = __dev_set_promiscuity(dev, inc);
2860 if (dev->flags != old_flags)
2861 dev_set_rx_mode(dev);
2866 * dev_set_allmulti - update allmulti count on a device
2870 * Add or remove reception of all multicast frames to a device. While the
2871 * count in the device remains above zero the interface remains listening
2872 * to all interfaces. Once it hits zero the device reverts back to normal
2873 * filtering operation. A negative @inc value is used to drop the counter
2874 * when releasing a resource needing all multicasts.
2875 * Return 0 if successful or a negative errno code on error.
2878 int dev_set_allmulti(struct net_device *dev, int inc)
2880 unsigned short old_flags = dev->flags;
2884 dev->flags |= IFF_ALLMULTI;
2885 dev->allmulti += inc;
2886 if (dev->allmulti == 0) {
2889 * If inc causes overflow, untouch allmulti and return error.
2892 dev->flags &= ~IFF_ALLMULTI;
2894 dev->allmulti -= inc;
2895 printk(KERN_WARNING "%s: allmulti touches roof, "
2896 "set allmulti failed, allmulti feature of "
2897 "device might be broken.\n", dev->name);
2901 if (dev->flags ^ old_flags) {
2902 if (dev->change_rx_flags)
2903 dev->change_rx_flags(dev, IFF_ALLMULTI);
2904 dev_set_rx_mode(dev);
2910 * Upload unicast and multicast address lists to device and
2911 * configure RX filtering. When the device doesn't support unicast
2912 * filtering it is put in promiscuous mode while unicast addresses
2915 void __dev_set_rx_mode(struct net_device *dev)
2917 /* dev_open will call this function so the list will stay sane. */
2918 if (!(dev->flags&IFF_UP))
2921 if (!netif_device_present(dev))
2924 if (dev->set_rx_mode)
2925 dev->set_rx_mode(dev);
2927 /* Unicast addresses changes may only happen under the rtnl,
2928 * therefore calling __dev_set_promiscuity here is safe.
2930 if (dev->uc_count > 0 && !dev->uc_promisc) {
2931 __dev_set_promiscuity(dev, 1);
2932 dev->uc_promisc = 1;
2933 } else if (dev->uc_count == 0 && dev->uc_promisc) {
2934 __dev_set_promiscuity(dev, -1);
2935 dev->uc_promisc = 0;
2938 if (dev->set_multicast_list)
2939 dev->set_multicast_list(dev);
2943 void dev_set_rx_mode(struct net_device *dev)
2945 netif_tx_lock_bh(dev);
2946 __dev_set_rx_mode(dev);
2947 netif_tx_unlock_bh(dev);
2950 int __dev_addr_delete(struct dev_addr_list **list, int *count,
2951 void *addr, int alen, int glbl)
2953 struct dev_addr_list *da;
2955 for (; (da = *list) != NULL; list = &da->next) {
2956 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
2957 alen == da->da_addrlen) {
2959 int old_glbl = da->da_gusers;
2976 int __dev_addr_add(struct dev_addr_list **list, int *count,
2977 void *addr, int alen, int glbl)
2979 struct dev_addr_list *da;
2981 for (da = *list; da != NULL; da = da->next) {
2982 if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 &&
2983 da->da_addrlen == alen) {
2985 int old_glbl = da->da_gusers;
2995 da = kzalloc(sizeof(*da), GFP_ATOMIC);
2998 memcpy(da->da_addr, addr, alen);
2999 da->da_addrlen = alen;
3001 da->da_gusers = glbl ? 1 : 0;
3009 * dev_unicast_delete - Release secondary unicast address.
3011 * @addr: address to delete
3012 * @alen: length of @addr
3014 * Release reference to a secondary unicast address and remove it
3015 * from the device if the reference count drops to zero.
3017 * The caller must hold the rtnl_mutex.
3019 int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
3025 netif_tx_lock_bh(dev);
3026 err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3028 __dev_set_rx_mode(dev);
3029 netif_tx_unlock_bh(dev);
3032 EXPORT_SYMBOL(dev_unicast_delete);
3035 * dev_unicast_add - add a secondary unicast address
3037 * @addr: address to delete
3038 * @alen: length of @addr
3040 * Add a secondary unicast address to the device or increase
3041 * the reference count if it already exists.
3043 * The caller must hold the rtnl_mutex.
3045 int dev_unicast_add(struct net_device *dev, void *addr, int alen)
3051 netif_tx_lock_bh(dev);
3052 err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0);
3054 __dev_set_rx_mode(dev);
3055 netif_tx_unlock_bh(dev);
3058 EXPORT_SYMBOL(dev_unicast_add);
3060 int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
3061 struct dev_addr_list **from, int *from_count)
3063 struct dev_addr_list *da, *next;
3067 while (da != NULL) {
3069 if (!da->da_synced) {
3070 err = __dev_addr_add(to, to_count,
3071 da->da_addr, da->da_addrlen, 0);
3076 } else if (da->da_users == 1) {
3077 __dev_addr_delete(to, to_count,
3078 da->da_addr, da->da_addrlen, 0);
3079 __dev_addr_delete(from, from_count,
3080 da->da_addr, da->da_addrlen, 0);
3087 void __dev_addr_unsync(struct dev_addr_list **to, int *to_count,
3088 struct dev_addr_list **from, int *from_count)
3090 struct dev_addr_list *da, *next;
3093 while (da != NULL) {
3095 if (da->da_synced) {
3096 __dev_addr_delete(to, to_count,
3097 da->da_addr, da->da_addrlen, 0);
3099 __dev_addr_delete(from, from_count,
3100 da->da_addr, da->da_addrlen, 0);
3107 * dev_unicast_sync - Synchronize device's unicast list to another device
3108 * @to: destination device
3109 * @from: source device
3111 * Add newly added addresses to the destination device and release
3112 * addresses that have no users left. The source device must be
3113 * locked by netif_tx_lock_bh.
3115 * This function is intended to be called from the dev->set_rx_mode
3116 * function of layered software devices.
3118 int dev_unicast_sync(struct net_device *to, struct net_device *from)
3122 netif_tx_lock_bh(to);
3123 err = __dev_addr_sync(&to->uc_list, &to->uc_count,
3124 &from->uc_list, &from->uc_count);
3126 __dev_set_rx_mode(to);
3127 netif_tx_unlock_bh(to);
3130 EXPORT_SYMBOL(dev_unicast_sync);
3133 * dev_unicast_unsync - Remove synchronized addresses from the destination device
3134 * @to: destination device
3135 * @from: source device
3137 * Remove all addresses that were added to the destination device by
3138 * dev_unicast_sync(). This function is intended to be called from the
3139 * dev->stop function of layered software devices.
3141 void dev_unicast_unsync(struct net_device *to, struct net_device *from)
3143 netif_tx_lock_bh(from);
3144 netif_tx_lock_bh(to);
3146 __dev_addr_unsync(&to->uc_list, &to->uc_count,
3147 &from->uc_list, &from->uc_count);
3148 __dev_set_rx_mode(to);
3150 netif_tx_unlock_bh(to);
3151 netif_tx_unlock_bh(from);
3153 EXPORT_SYMBOL(dev_unicast_unsync);
3155 static void __dev_addr_discard(struct dev_addr_list **list)
3157 struct dev_addr_list *tmp;
3159 while (*list != NULL) {
3162 if (tmp->da_users > tmp->da_gusers)
3163 printk("__dev_addr_discard: address leakage! "
3164 "da_users=%d\n", tmp->da_users);
3169 static void dev_addr_discard(struct net_device *dev)
3171 netif_tx_lock_bh(dev);
3173 __dev_addr_discard(&dev->uc_list);
3176 __dev_addr_discard(&dev->mc_list);
3179 netif_tx_unlock_bh(dev);
3182 unsigned dev_get_flags(const struct net_device *dev)
3186 flags = (dev->flags & ~(IFF_PROMISC |
3191 (dev->gflags & (IFF_PROMISC |
3194 if (netif_running(dev)) {
3195 if (netif_oper_up(dev))
3196 flags |= IFF_RUNNING;
3197 if (netif_carrier_ok(dev))
3198 flags |= IFF_LOWER_UP;
3199 if (netif_dormant(dev))
3200 flags |= IFF_DORMANT;
3206 int dev_change_flags(struct net_device *dev, unsigned flags)
3209 int old_flags = dev->flags;
3214 * Set the flags on our device.
3217 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
3218 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
3220 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
3224 * Load in the correct multicast list now the flags have changed.
3227 if (dev->change_rx_flags && (old_flags ^ flags) & IFF_MULTICAST)
3228 dev->change_rx_flags(dev, IFF_MULTICAST);
3230 dev_set_rx_mode(dev);
3233 * Have we downed the interface. We handle IFF_UP ourselves
3234 * according to user attempts to set it, rather than blindly
3239 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
3240 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
3243 dev_set_rx_mode(dev);
3246 if (dev->flags & IFF_UP &&
3247 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
3249 call_netdevice_notifiers(NETDEV_CHANGE, dev);
3251 if ((flags ^ dev->gflags) & IFF_PROMISC) {
3252 int inc = (flags & IFF_PROMISC) ? +1 : -1;
3253 dev->gflags ^= IFF_PROMISC;
3254 dev_set_promiscuity(dev, inc);
3257 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
3258 is important. Some (broken) drivers set IFF_PROMISC, when
3259 IFF_ALLMULTI is requested not asking us and not reporting.
3261 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
3262 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
3263 dev->gflags ^= IFF_ALLMULTI;
3264 dev_set_allmulti(dev, inc);
3267 /* Exclude state transition flags, already notified */
3268 changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING);
3270 rtmsg_ifinfo(RTM_NEWLINK, dev, changes);
3275 int dev_set_mtu(struct net_device *dev, int new_mtu)
3279 if (new_mtu == dev->mtu)
3282 /* MTU must be positive. */
3286 if (!netif_device_present(dev))
3290 if (dev->change_mtu)
3291 err = dev->change_mtu(dev, new_mtu);
3294 if (!err && dev->flags & IFF_UP)
3295 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
3299 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
3303 if (!dev->set_mac_address)
3305 if (sa->sa_family != dev->type)
3307 if (!netif_device_present(dev))
3309 err = dev->set_mac_address(dev, sa);
3311 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3316 * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock)
3318 static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
3321 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3327 case SIOCGIFFLAGS: /* Get interface flags */
3328 ifr->ifr_flags = dev_get_flags(dev);
3331 case SIOCGIFMETRIC: /* Get the metric on the interface
3332 (currently unused) */
3333 ifr->ifr_metric = 0;
3336 case SIOCGIFMTU: /* Get the MTU of a device */
3337 ifr->ifr_mtu = dev->mtu;
3342 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
3344 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
3345 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3346 ifr->ifr_hwaddr.sa_family = dev->type;
3354 ifr->ifr_map.mem_start = dev->mem_start;
3355 ifr->ifr_map.mem_end = dev->mem_end;
3356 ifr->ifr_map.base_addr = dev->base_addr;
3357 ifr->ifr_map.irq = dev->irq;
3358 ifr->ifr_map.dma = dev->dma;
3359 ifr->ifr_map.port = dev->if_port;
3363 ifr->ifr_ifindex = dev->ifindex;
3367 ifr->ifr_qlen = dev->tx_queue_len;
3371 /* dev_ioctl() should ensure this case
3383 * Perform the SIOCxIFxxx calls, inside rtnl_lock()
3385 static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
3388 struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
3394 case SIOCSIFFLAGS: /* Set interface flags */
3395 return dev_change_flags(dev, ifr->ifr_flags);
3397 case SIOCSIFMETRIC: /* Set the metric on the interface
3398 (currently unused) */
3401 case SIOCSIFMTU: /* Set the MTU of a device */
3402 return dev_set_mtu(dev, ifr->ifr_mtu);
3405 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
3407 case SIOCSIFHWBROADCAST:
3408 if (ifr->ifr_hwaddr.sa_family != dev->type)
3410 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
3411 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
3412 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
3416 if (dev->set_config) {
3417 if (!netif_device_present(dev))
3419 return dev->set_config(dev, &ifr->ifr_map);
3424 if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
3425 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3427 if (!netif_device_present(dev))
3429 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
3433 if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
3434 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
3436 if (!netif_device_present(dev))
3438 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
3442 if (ifr->ifr_qlen < 0)
3444 dev->tx_queue_len = ifr->ifr_qlen;
3448 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
3449 return dev_change_name(dev, ifr->ifr_newname);
3452 * Unknown or private ioctl
3456 if ((cmd >= SIOCDEVPRIVATE &&
3457 cmd <= SIOCDEVPRIVATE + 15) ||
3458 cmd == SIOCBONDENSLAVE ||
3459 cmd == SIOCBONDRELEASE ||
3460 cmd == SIOCBONDSETHWADDR ||
3461 cmd == SIOCBONDSLAVEINFOQUERY ||
3462 cmd == SIOCBONDINFOQUERY ||
3463 cmd == SIOCBONDCHANGEACTIVE ||
3464 cmd == SIOCGMIIPHY ||
3465 cmd == SIOCGMIIREG ||
3466 cmd == SIOCSMIIREG ||
3467 cmd == SIOCBRADDIF ||
3468 cmd == SIOCBRDELIF ||
3469 cmd == SIOCWANDEV) {
3471 if (dev->do_ioctl) {
3472 if (netif_device_present(dev))
3473 err = dev->do_ioctl(dev, ifr,
3486 * This function handles all "interface"-type I/O control requests. The actual
3487 * 'doing' part of this is dev_ifsioc above.
3491 * dev_ioctl - network device ioctl
3492 * @net: the applicable net namespace
3493 * @cmd: command to issue
3494 * @arg: pointer to a struct ifreq in user space
3496 * Issue ioctl functions to devices. This is normally called by the
3497 * user space syscall interfaces but can sometimes be useful for
3498 * other purposes. The return value is the return from the syscall if
3499 * positive or a negative errno code on error.
3502 int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg)
3508 /* One special case: SIOCGIFCONF takes ifconf argument
3509 and requires shared lock, because it sleeps writing
3513 if (cmd == SIOCGIFCONF) {
3515 ret = dev_ifconf(net, (char __user *) arg);
3519 if (cmd == SIOCGIFNAME)
3520 return dev_ifname(net, (struct ifreq __user *)arg);
3522 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
3525 ifr.ifr_name[IFNAMSIZ-1] = 0;
3527 colon = strchr(ifr.ifr_name, ':');
3532 * See which interface the caller is talking about.
3537 * These ioctl calls:
3538 * - can be done by all.
3539 * - atomic and do not require locking.
3550 dev_load(net, ifr.ifr_name);
3551 read_lock(&dev_base_lock);
3552 ret = dev_ifsioc_locked(net, &ifr, cmd);
3553 read_unlock(&dev_base_lock);
3557 if (copy_to_user(arg, &ifr,
3558 sizeof(struct ifreq)))
3564 dev_load(net, ifr.ifr_name);
3566 ret = dev_ethtool(net, &ifr);
3571 if (copy_to_user(arg, &ifr,
3572 sizeof(struct ifreq)))
3578 * These ioctl calls:
3579 * - require superuser power.
3580 * - require strict serialization.
3586 if (!capable(CAP_NET_ADMIN))
3588 dev_load(net, ifr.ifr_name);
3590 ret = dev_ifsioc(net, &ifr, cmd);
3595 if (copy_to_user(arg, &ifr,
3596 sizeof(struct ifreq)))
3602 * These ioctl calls:
3603 * - require superuser power.
3604 * - require strict serialization.
3605 * - do not return a value
3615 case SIOCSIFHWBROADCAST:
3618 case SIOCBONDENSLAVE:
3619 case SIOCBONDRELEASE:
3620 case SIOCBONDSETHWADDR:
3621 case SIOCBONDCHANGEACTIVE:
3624 if (!capable(CAP_NET_ADMIN))
3627 case SIOCBONDSLAVEINFOQUERY:
3628 case SIOCBONDINFOQUERY:
3629 dev_load(net, ifr.ifr_name);
3631 ret = dev_ifsioc(net, &ifr, cmd);
3636 /* Get the per device memory space. We can add this but
3637 * currently do not support it */
3639 /* Set the per device memory buffer space.
3640 * Not applicable in our case */
3645 * Unknown or private ioctl.
3648 if (cmd == SIOCWANDEV ||
3649 (cmd >= SIOCDEVPRIVATE &&
3650 cmd <= SIOCDEVPRIVATE + 15)) {
3651 dev_load(net, ifr.ifr_name);
3653 ret = dev_ifsioc(net, &ifr, cmd);
3655 if (!ret && copy_to_user(arg, &ifr,
3656 sizeof(struct ifreq)))
3660 /* Take care of Wireless Extensions */
3661 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST)
3662 return wext_handle_ioctl(net, &ifr, cmd, arg);
3669 * dev_new_index - allocate an ifindex
3670 * @net: the applicable net namespace
3672 * Returns a suitable unique value for a new device interface
3673 * number. The caller must hold the rtnl semaphore or the
3674 * dev_base_lock to be sure it remains unique.
3676 static int dev_new_index(struct net *net)
3682 if (!__dev_get_by_index(net, ifindex))
3687 /* Delayed registration/unregisteration */
3688 static DEFINE_SPINLOCK(net_todo_list_lock);
3689 static LIST_HEAD(net_todo_list);
3691 static void net_set_todo(struct net_device *dev)
3693 spin_lock(&net_todo_list_lock);
3694 list_add_tail(&dev->todo_list, &net_todo_list);
3695 spin_unlock(&net_todo_list_lock);
3698 static void rollback_registered(struct net_device *dev)
3700 BUG_ON(dev_boot_phase);
3703 /* Some devices call without registering for initialization unwind. */
3704 if (dev->reg_state == NETREG_UNINITIALIZED) {
3705 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3706 "was registered\n", dev->name, dev);
3712 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3714 /* If device is running, close it first. */
3717 /* And unlink it from device chain. */
3718 unlist_netdevice(dev);
3720 dev->reg_state = NETREG_UNREGISTERING;
3724 /* Shutdown queueing discipline. */
3728 /* Notify protocols, that we are about to destroy
3729 this device. They should clean all the things.
3731 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
3734 * Flush the unicast and multicast chains
3736 dev_addr_discard(dev);
3741 /* Notifier chain MUST detach us from master device. */
3742 BUG_TRAP(!dev->master);
3744 /* Remove entries from kobject tree */
3745 netdev_unregister_kobject(dev);
3753 * register_netdevice - register a network device
3754 * @dev: device to register
3756 * Take a completed network device structure and add it to the kernel
3757 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3758 * chain. 0 is returned on success. A negative errno code is returned
3759 * on a failure to set up the device, or if the name is a duplicate.
3761 * Callers must hold the rtnl semaphore. You may want
3762 * register_netdev() instead of this.
3765 * The locking appears insufficient to guarantee two parallel registers
3766 * will not get the same name.
3769 int register_netdevice(struct net_device *dev)
3771 struct hlist_head *head;
3772 struct hlist_node *p;
3776 BUG_ON(dev_boot_phase);
3781 /* When net_device's are persistent, this will be fatal. */
3782 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
3783 BUG_ON(!dev_net(dev));
3786 spin_lock_init(&dev->queue_lock);
3787 spin_lock_init(&dev->_xmit_lock);
3788 netdev_set_lockdep_class(&dev->_xmit_lock, dev->type);
3789 dev->xmit_lock_owner = -1;
3790 spin_lock_init(&dev->ingress_lock);
3794 /* Init, if this function is available */
3796 ret = dev->init(dev);
3804 if (!dev_valid_name(dev->name)) {
3809 dev->ifindex = dev_new_index(net);
3810 if (dev->iflink == -1)
3811 dev->iflink = dev->ifindex;
3813 /* Check for existence of name */
3814 head = dev_name_hash(net, dev->name);
3815 hlist_for_each(p, head) {
3816 struct net_device *d
3817 = hlist_entry(p, struct net_device, name_hlist);
3818 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
3824 /* Fix illegal checksum combinations */
3825 if ((dev->features & NETIF_F_HW_CSUM) &&
3826 (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3827 printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n",
3829 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
3832 if ((dev->features & NETIF_F_NO_CSUM) &&
3833 (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
3834 printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n",
3836 dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM);
3840 /* Fix illegal SG+CSUM combinations. */
3841 if ((dev->features & NETIF_F_SG) &&
3842 !(dev->features & NETIF_F_ALL_CSUM)) {
3843 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
3845 dev->features &= ~NETIF_F_SG;
3848 /* TSO requires that SG is present as well. */
3849 if ((dev->features & NETIF_F_TSO) &&
3850 !(dev->features & NETIF_F_SG)) {
3851 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
3853 dev->features &= ~NETIF_F_TSO;
3855 if (dev->features & NETIF_F_UFO) {
3856 if (!(dev->features & NETIF_F_HW_CSUM)) {
3857 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3858 "NETIF_F_HW_CSUM feature.\n",
3860 dev->features &= ~NETIF_F_UFO;
3862 if (!(dev->features & NETIF_F_SG)) {
3863 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3864 "NETIF_F_SG feature.\n",
3866 dev->features &= ~NETIF_F_UFO;
3870 netdev_initialize_kobject(dev);
3871 ret = netdev_register_kobject(dev);
3874 dev->reg_state = NETREG_REGISTERED;
3877 * Default initial state at registry is that the
3878 * device is present.
3881 set_bit(__LINK_STATE_PRESENT, &dev->state);
3883 dev_init_scheduler(dev);
3885 list_netdevice(dev);
3887 /* Notify protocols, that a new device appeared. */
3888 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
3889 ret = notifier_to_errno(ret);
3891 rollback_registered(dev);
3892 dev->reg_state = NETREG_UNREGISTERED;
3905 * register_netdev - register a network device
3906 * @dev: device to register
3908 * Take a completed network device structure and add it to the kernel
3909 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3910 * chain. 0 is returned on success. A negative errno code is returned
3911 * on a failure to set up the device, or if the name is a duplicate.
3913 * This is a wrapper around register_netdevice that takes the rtnl semaphore
3914 * and expands the device name if you passed a format string to
3917 int register_netdev(struct net_device *dev)
3924 * If the name is a format string the caller wants us to do a
3927 if (strchr(dev->name, '%')) {
3928 err = dev_alloc_name(dev, dev->name);
3933 err = register_netdevice(dev);
3938 EXPORT_SYMBOL(register_netdev);
3941 * netdev_wait_allrefs - wait until all references are gone.
3943 * This is called when unregistering network devices.
3945 * Any protocol or device that holds a reference should register
3946 * for netdevice notification, and cleanup and put back the
3947 * reference if they receive an UNREGISTER event.
3948 * We can get stuck here if buggy protocols don't correctly
3951 static void netdev_wait_allrefs(struct net_device *dev)
3953 unsigned long rebroadcast_time, warning_time;
3955 rebroadcast_time = warning_time = jiffies;
3956 while (atomic_read(&dev->refcnt) != 0) {
3957 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
3960 /* Rebroadcast unregister notification */
3961 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
3963 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
3965 /* We must not have linkwatch events
3966 * pending on unregister. If this
3967 * happens, we simply run the queue
3968 * unscheduled, resulting in a noop
3971 linkwatch_run_queue();
3976 rebroadcast_time = jiffies;
3981 if (time_after(jiffies, warning_time + 10 * HZ)) {
3982 printk(KERN_EMERG "unregister_netdevice: "
3983 "waiting for %s to become free. Usage "
3985 dev->name, atomic_read(&dev->refcnt));
3986 warning_time = jiffies;
3995 * register_netdevice(x1);
3996 * register_netdevice(x2);
3998 * unregister_netdevice(y1);
3999 * unregister_netdevice(y2);
4005 * We are invoked by rtnl_unlock() after it drops the semaphore.
4006 * This allows us to deal with problems:
4007 * 1) We can delete sysfs objects which invoke hotplug
4008 * without deadlocking with linkwatch via keventd.
4009 * 2) Since we run with the RTNL semaphore not held, we can sleep
4010 * safely in order to wait for the netdev refcnt to drop to zero.
4012 static DEFINE_MUTEX(net_todo_run_mutex);
4013 void netdev_run_todo(void)
4015 struct list_head list;
4017 /* Need to guard against multiple cpu's getting out of order. */
4018 mutex_lock(&net_todo_run_mutex);
4020 /* Not safe to do outside the semaphore. We must not return
4021 * until all unregister events invoked by the local processor
4022 * have been completed (either by this todo run, or one on
4025 if (list_empty(&net_todo_list))
4028 /* Snapshot list, allow later requests */
4029 spin_lock(&net_todo_list_lock);
4030 list_replace_init(&net_todo_list, &list);
4031 spin_unlock(&net_todo_list_lock);
4033 while (!list_empty(&list)) {
4034 struct net_device *dev
4035 = list_entry(list.next, struct net_device, todo_list);
4036 list_del(&dev->todo_list);
4038 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
4039 printk(KERN_ERR "network todo '%s' but state %d\n",
4040 dev->name, dev->reg_state);
4045 dev->reg_state = NETREG_UNREGISTERED;
4047 netdev_wait_allrefs(dev);
4050 BUG_ON(atomic_read(&dev->refcnt));
4051 BUG_TRAP(!dev->ip_ptr);
4052 BUG_TRAP(!dev->ip6_ptr);
4053 BUG_TRAP(!dev->dn_ptr);
4055 if (dev->destructor)
4056 dev->destructor(dev);
4058 /* Free network device */
4059 kobject_put(&dev->dev.kobj);
4063 mutex_unlock(&net_todo_run_mutex);
4066 static struct net_device_stats *internal_stats(struct net_device *dev)
4072 * alloc_netdev_mq - allocate network device
4073 * @sizeof_priv: size of private data to allocate space for
4074 * @name: device name format string
4075 * @setup: callback to initialize device
4076 * @queue_count: the number of subqueues to allocate
4078 * Allocates a struct net_device with private data area for driver use
4079 * and performs basic initialization. Also allocates subquue structs
4080 * for each queue on the device at the end of the netdevice.
4082 struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name,
4083 void (*setup)(struct net_device *), unsigned int queue_count)
4086 struct net_device *dev;
4089 BUG_ON(strlen(name) >= sizeof(dev->name));
4091 alloc_size = sizeof(struct net_device) +
4092 sizeof(struct net_device_subqueue) * (queue_count - 1);
4094 /* ensure 32-byte alignment of private area */
4095 alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
4096 alloc_size += sizeof_priv;
4098 /* ensure 32-byte alignment of whole construct */
4099 alloc_size += NETDEV_ALIGN_CONST;
4101 p = kzalloc(alloc_size, GFP_KERNEL);
4103 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
4107 dev = (struct net_device *)
4108 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
4109 dev->padded = (char *)dev - (char *)p;
4110 dev_net_set(dev, &init_net);
4113 dev->priv = ((char *)dev +
4114 ((sizeof(struct net_device) +
4115 (sizeof(struct net_device_subqueue) *
4116 (queue_count - 1)) + NETDEV_ALIGN_CONST)
4117 & ~NETDEV_ALIGN_CONST));
4120 dev->egress_subqueue_count = queue_count;
4121 dev->gso_max_size = GSO_MAX_SIZE;
4123 dev->get_stats = internal_stats;
4124 netpoll_netdev_init(dev);
4126 strcpy(dev->name, name);
4129 EXPORT_SYMBOL(alloc_netdev_mq);
4132 * free_netdev - free network device
4135 * This function does the last stage of destroying an allocated device
4136 * interface. The reference to the device object is released.
4137 * If this is the last reference then it will be freed.
4139 void free_netdev(struct net_device *dev)
4141 release_net(dev_net(dev));
4143 /* Compatibility with error handling in drivers */
4144 if (dev->reg_state == NETREG_UNINITIALIZED) {
4145 kfree((char *)dev - dev->padded);
4149 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
4150 dev->reg_state = NETREG_RELEASED;
4152 /* will free via device release */
4153 put_device(&dev->dev);
4156 /* Synchronize with packet receive processing. */
4157 void synchronize_net(void)
4164 * unregister_netdevice - remove device from the kernel
4167 * This function shuts down a device interface and removes it
4168 * from the kernel tables.
4170 * Callers must hold the rtnl semaphore. You may want
4171 * unregister_netdev() instead of this.
4174 void unregister_netdevice(struct net_device *dev)
4178 rollback_registered(dev);
4179 /* Finish processing unregister after unlock */
4184 * unregister_netdev - remove device from the kernel
4187 * This function shuts down a device interface and removes it
4188 * from the kernel tables.
4190 * This is just a wrapper for unregister_netdevice that takes
4191 * the rtnl semaphore. In general you want to use this and not
4192 * unregister_netdevice.
4194 void unregister_netdev(struct net_device *dev)
4197 unregister_netdevice(dev);
4201 EXPORT_SYMBOL(unregister_netdev);
4204 * dev_change_net_namespace - move device to different nethost namespace
4206 * @net: network namespace
4207 * @pat: If not NULL name pattern to try if the current device name
4208 * is already taken in the destination network namespace.
4210 * This function shuts down a device interface and moves it
4211 * to a new network namespace. On success 0 is returned, on
4212 * a failure a netagive errno code is returned.
4214 * Callers must hold the rtnl semaphore.
4217 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
4220 const char *destname;
4225 /* Don't allow namespace local devices to be moved. */
4227 if (dev->features & NETIF_F_NETNS_LOCAL)
4230 /* Ensure the device has been registrered */
4232 if (dev->reg_state != NETREG_REGISTERED)
4235 /* Get out if there is nothing todo */
4237 if (net_eq(dev_net(dev), net))
4240 /* Pick the destination device name, and ensure
4241 * we can use it in the destination network namespace.
4244 destname = dev->name;
4245 if (__dev_get_by_name(net, destname)) {
4246 /* We get here if we can't use the current device name */
4249 if (!dev_valid_name(pat))
4251 if (strchr(pat, '%')) {
4252 if (__dev_alloc_name(net, pat, buf) < 0)
4257 if (__dev_get_by_name(net, destname))
4262 * And now a mini version of register_netdevice unregister_netdevice.
4265 /* If device is running close it first. */
4268 /* And unlink it from device chain */
4270 unlist_netdevice(dev);
4274 /* Shutdown queueing discipline. */
4277 /* Notify protocols, that we are about to destroy
4278 this device. They should clean all the things.
4280 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
4283 * Flush the unicast and multicast chains
4285 dev_addr_discard(dev);
4287 /* Actually switch the network namespace */
4288 dev_net_set(dev, net);
4290 /* Assign the new device name */
4291 if (destname != dev->name)
4292 strcpy(dev->name, destname);
4294 /* If there is an ifindex conflict assign a new one */
4295 if (__dev_get_by_index(net, dev->ifindex)) {
4296 int iflink = (dev->iflink == dev->ifindex);
4297 dev->ifindex = dev_new_index(net);
4299 dev->iflink = dev->ifindex;
4302 /* Fixup kobjects */
4303 netdev_unregister_kobject(dev);
4304 err = netdev_register_kobject(dev);
4307 /* Add the device back in the hashes */
4308 list_netdevice(dev);
4310 /* Notify protocols, that a new device appeared. */
4311 call_netdevice_notifiers(NETDEV_REGISTER, dev);
4319 static int dev_cpu_callback(struct notifier_block *nfb,
4320 unsigned long action,
4323 struct sk_buff **list_skb;
4324 struct net_device **list_net;
4325 struct sk_buff *skb;
4326 unsigned int cpu, oldcpu = (unsigned long)ocpu;
4327 struct softnet_data *sd, *oldsd;
4329 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
4332 local_irq_disable();
4333 cpu = smp_processor_id();
4334 sd = &per_cpu(softnet_data, cpu);
4335 oldsd = &per_cpu(softnet_data, oldcpu);
4337 /* Find end of our completion_queue. */
4338 list_skb = &sd->completion_queue;
4340 list_skb = &(*list_skb)->next;
4341 /* Append completion queue from offline CPU. */
4342 *list_skb = oldsd->completion_queue;
4343 oldsd->completion_queue = NULL;
4345 /* Find end of our output_queue. */
4346 list_net = &sd->output_queue;
4348 list_net = &(*list_net)->next_sched;
4349 /* Append output queue from offline CPU. */
4350 *list_net = oldsd->output_queue;
4351 oldsd->output_queue = NULL;
4353 raise_softirq_irqoff(NET_TX_SOFTIRQ);
4356 /* Process offline CPU's input_pkt_queue */
4357 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
4363 #ifdef CONFIG_NET_DMA
4365 * net_dma_rebalance - try to maintain one DMA channel per CPU
4366 * @net_dma: DMA client and associated data (lock, channels, channel_mask)
4368 * This is called when the number of channels allocated to the net_dma client
4369 * changes. The net_dma client tries to have one DMA channel per CPU.
4372 static void net_dma_rebalance(struct net_dma *net_dma)
4374 unsigned int cpu, i, n, chan_idx;
4375 struct dma_chan *chan;
4377 if (cpus_empty(net_dma->channel_mask)) {
4378 for_each_online_cpu(cpu)
4379 rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
4384 cpu = first_cpu(cpu_online_map);
4386 for_each_cpu_mask(chan_idx, net_dma->channel_mask) {
4387 chan = net_dma->channels[chan_idx];
4389 n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask))
4390 + (i < (num_online_cpus() %
4391 cpus_weight(net_dma->channel_mask)) ? 1 : 0));
4394 per_cpu(softnet_data, cpu).net_dma = chan;
4395 cpu = next_cpu(cpu, cpu_online_map);
4403 * netdev_dma_event - event callback for the net_dma_client
4404 * @client: should always be net_dma_client
4405 * @chan: DMA channel for the event
4406 * @state: DMA state to be handled
4408 static enum dma_state_client
4409 netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
4410 enum dma_state state)
4412 int i, found = 0, pos = -1;
4413 struct net_dma *net_dma =
4414 container_of(client, struct net_dma, client);
4415 enum dma_state_client ack = DMA_DUP; /* default: take no action */
4417 spin_lock(&net_dma->lock);
4419 case DMA_RESOURCE_AVAILABLE:
4420 for (i = 0; i < nr_cpu_ids; i++)
4421 if (net_dma->channels[i] == chan) {
4424 } else if (net_dma->channels[i] == NULL && pos < 0)
4427 if (!found && pos >= 0) {
4429 net_dma->channels[pos] = chan;
4430 cpu_set(pos, net_dma->channel_mask);
4431 net_dma_rebalance(net_dma);
4434 case DMA_RESOURCE_REMOVED:
4435 for (i = 0; i < nr_cpu_ids; i++)
4436 if (net_dma->channels[i] == chan) {
4444 cpu_clear(pos, net_dma->channel_mask);
4445 net_dma->channels[i] = NULL;
4446 net_dma_rebalance(net_dma);
4452 spin_unlock(&net_dma->lock);
4458 * netdev_dma_regiser - register the networking subsystem as a DMA client
4460 static int __init netdev_dma_register(void)
4462 net_dma.channels = kzalloc(nr_cpu_ids * sizeof(struct net_dma),
4464 if (unlikely(!net_dma.channels)) {
4466 "netdev_dma: no memory for net_dma.channels\n");
4469 spin_lock_init(&net_dma.lock);
4470 dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask);
4471 dma_async_client_register(&net_dma.client);
4472 dma_async_client_chan_request(&net_dma.client);
4477 static int __init netdev_dma_register(void) { return -ENODEV; }
4478 #endif /* CONFIG_NET_DMA */
4481 * netdev_compute_feature - compute conjunction of two feature sets
4482 * @all: first feature set
4483 * @one: second feature set
4485 * Computes a new feature set after adding a device with feature set
4486 * @one to the master device with current feature set @all. Returns
4487 * the new feature set.
4489 int netdev_compute_features(unsigned long all, unsigned long one)
4491 /* if device needs checksumming, downgrade to hw checksumming */
4492 if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM))
4493 all ^= NETIF_F_NO_CSUM | NETIF_F_HW_CSUM;
4495 /* if device can't do all checksum, downgrade to ipv4/ipv6 */
4496 if (all & NETIF_F_HW_CSUM && !(one & NETIF_F_HW_CSUM))
4497 all ^= NETIF_F_HW_CSUM
4498 | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
4500 if (one & NETIF_F_GSO)
4501 one |= NETIF_F_GSO_SOFTWARE;
4504 /* If even one device supports robust GSO, enable it for all. */
4505 if (one & NETIF_F_GSO_ROBUST)
4506 all |= NETIF_F_GSO_ROBUST;
4508 all &= one | NETIF_F_LLTX;
4510 if (!(all & NETIF_F_ALL_CSUM))
4512 if (!(all & NETIF_F_SG))
4513 all &= ~NETIF_F_GSO_MASK;
4517 EXPORT_SYMBOL(netdev_compute_features);
4519 static struct hlist_head *netdev_create_hash(void)
4522 struct hlist_head *hash;
4524 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
4526 for (i = 0; i < NETDEV_HASHENTRIES; i++)
4527 INIT_HLIST_HEAD(&hash[i]);
4532 /* Initialize per network namespace state */
4533 static int __net_init netdev_init(struct net *net)
4535 INIT_LIST_HEAD(&net->dev_base_head);
4537 net->dev_name_head = netdev_create_hash();
4538 if (net->dev_name_head == NULL)
4541 net->dev_index_head = netdev_create_hash();
4542 if (net->dev_index_head == NULL)
4548 kfree(net->dev_name_head);
4553 static void __net_exit netdev_exit(struct net *net)
4555 kfree(net->dev_name_head);
4556 kfree(net->dev_index_head);
4559 static struct pernet_operations __net_initdata netdev_net_ops = {
4560 .init = netdev_init,
4561 .exit = netdev_exit,
4564 static void __net_exit default_device_exit(struct net *net)
4566 struct net_device *dev, *next;
4568 * Push all migratable of the network devices back to the
4569 * initial network namespace
4572 for_each_netdev_safe(net, dev, next) {
4574 char fb_name[IFNAMSIZ];
4576 /* Ignore unmoveable devices (i.e. loopback) */
4577 if (dev->features & NETIF_F_NETNS_LOCAL)
4580 /* Push remaing network devices to init_net */
4581 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
4582 err = dev_change_net_namespace(dev, &init_net, fb_name);
4584 printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n",
4585 __func__, dev->name, err);
4592 static struct pernet_operations __net_initdata default_device_ops = {
4593 .exit = default_device_exit,
4597 * Initialize the DEV module. At boot time this walks the device list and
4598 * unhooks any devices that fail to initialise (normally hardware not
4599 * present) and leaves us with a valid list of present and active devices.
4604 * This is called single threaded during boot, so no need
4605 * to take the rtnl semaphore.
4607 static int __init net_dev_init(void)
4609 int i, rc = -ENOMEM;
4611 BUG_ON(!dev_boot_phase);
4613 if (dev_proc_init())
4616 if (netdev_kobject_init())
4619 INIT_LIST_HEAD(&ptype_all);
4620 for (i = 0; i < PTYPE_HASH_SIZE; i++)
4621 INIT_LIST_HEAD(&ptype_base[i]);
4623 if (register_pernet_subsys(&netdev_net_ops))
4626 if (register_pernet_device(&default_device_ops))
4630 * Initialise the packet receive queues.
4633 for_each_possible_cpu(i) {
4634 struct softnet_data *queue;
4636 queue = &per_cpu(softnet_data, i);
4637 skb_queue_head_init(&queue->input_pkt_queue);
4638 queue->completion_queue = NULL;
4639 INIT_LIST_HEAD(&queue->poll_list);
4641 queue->backlog.poll = process_backlog;
4642 queue->backlog.weight = weight_p;
4645 netdev_dma_register();
4649 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
4650 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
4652 hotcpu_notifier(dev_cpu_callback, 0);
4660 subsys_initcall(net_dev_init);
4662 EXPORT_SYMBOL(__dev_get_by_index);
4663 EXPORT_SYMBOL(__dev_get_by_name);
4664 EXPORT_SYMBOL(__dev_remove_pack);
4665 EXPORT_SYMBOL(dev_valid_name);
4666 EXPORT_SYMBOL(dev_add_pack);
4667 EXPORT_SYMBOL(dev_alloc_name);
4668 EXPORT_SYMBOL(dev_close);
4669 EXPORT_SYMBOL(dev_get_by_flags);
4670 EXPORT_SYMBOL(dev_get_by_index);
4671 EXPORT_SYMBOL(dev_get_by_name);
4672 EXPORT_SYMBOL(dev_open);
4673 EXPORT_SYMBOL(dev_queue_xmit);
4674 EXPORT_SYMBOL(dev_remove_pack);
4675 EXPORT_SYMBOL(dev_set_allmulti);
4676 EXPORT_SYMBOL(dev_set_promiscuity);
4677 EXPORT_SYMBOL(dev_change_flags);
4678 EXPORT_SYMBOL(dev_set_mtu);
4679 EXPORT_SYMBOL(dev_set_mac_address);
4680 EXPORT_SYMBOL(free_netdev);
4681 EXPORT_SYMBOL(netdev_boot_setup_check);
4682 EXPORT_SYMBOL(netdev_set_master);
4683 EXPORT_SYMBOL(netdev_state_change);
4684 EXPORT_SYMBOL(netif_receive_skb);
4685 EXPORT_SYMBOL(netif_rx);
4686 EXPORT_SYMBOL(register_gifconf);
4687 EXPORT_SYMBOL(register_netdevice);
4688 EXPORT_SYMBOL(register_netdevice_notifier);
4689 EXPORT_SYMBOL(skb_checksum_help);
4690 EXPORT_SYMBOL(synchronize_net);
4691 EXPORT_SYMBOL(unregister_netdevice);
4692 EXPORT_SYMBOL(unregister_netdevice_notifier);
4693 EXPORT_SYMBOL(net_enable_timestamp);
4694 EXPORT_SYMBOL(net_disable_timestamp);
4695 EXPORT_SYMBOL(dev_get_flags);
4697 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
4698 EXPORT_SYMBOL(br_handle_frame_hook);
4699 EXPORT_SYMBOL(br_fdb_get_hook);
4700 EXPORT_SYMBOL(br_fdb_put_hook);
4704 EXPORT_SYMBOL(dev_load);
4707 EXPORT_PER_CPU_SYMBOL(softnet_data);