2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/sched.h>
83 #include <linux/mutex.h>
84 #include <linux/string.h>
86 #include <linux/socket.h>
87 #include <linux/sockios.h>
88 #include <linux/errno.h>
89 #include <linux/interrupt.h>
90 #include <linux/if_ether.h>
91 #include <linux/netdevice.h>
92 #include <linux/etherdevice.h>
93 #include <linux/notifier.h>
94 #include <linux/skbuff.h>
96 #include <linux/rtnetlink.h>
97 #include <linux/proc_fs.h>
98 #include <linux/seq_file.h>
99 #include <linux/stat.h>
100 #include <linux/if_bridge.h>
102 #include <net/pkt_sched.h>
103 #include <net/checksum.h>
104 #include <linux/highmem.h>
105 #include <linux/init.h>
106 #include <linux/kmod.h>
107 #include <linux/module.h>
108 #include <linux/kallsyms.h>
109 #include <linux/netpoll.h>
110 #include <linux/rcupdate.h>
111 #include <linux/delay.h>
112 #include <linux/wireless.h>
113 #include <net/iw_handler.h>
114 #include <asm/current.h>
115 #include <linux/audit.h>
116 #include <linux/dmaengine.h>
117 #include <linux/err.h>
118 #include <linux/ctype.h>
121 * The list of packet types we will receive (as opposed to discard)
122 * and the routines to invoke.
124 * Why 16. Because with 16 the only overlap we get on a hash of the
125 * low nibble of the protocol value is RARP/SNAP/X.25.
127 * NOTE: That is no longer true with the addition of VLAN tags. Not
128 * sure which should go first, but I bet it won't make much
129 * difference if we are running VLANs. The good news is that
130 * this protocol won't be in the list unless compiled in, so
131 * the average user (w/out VLANs) will not be adversely affected.
148 static DEFINE_SPINLOCK(ptype_lock);
149 static struct list_head ptype_base[16] __read_mostly; /* 16 way hashed list */
150 static struct list_head ptype_all __read_mostly; /* Taps */
152 #ifdef CONFIG_NET_DMA
153 static struct dma_client *net_dma_client;
154 static unsigned int net_dma_count;
155 static spinlock_t net_dma_event_lock;
159 * The @dev_base list is protected by @dev_base_lock and the rtnl
162 * Pure readers hold dev_base_lock for reading.
164 * Writers must hold the rtnl semaphore while they loop through the
165 * dev_base list, and hold dev_base_lock for writing when they do the
166 * actual updates. This allows pure readers to access the list even
167 * while a writer is preparing to update it.
169 * To put it another way, dev_base_lock is held for writing only to
170 * protect against pure readers; the rtnl semaphore provides the
171 * protection against other writers.
173 * See, for example usages, register_netdevice() and
174 * unregister_netdevice(), which must be called with the rtnl
177 struct net_device *dev_base;
178 static struct net_device **dev_tail = &dev_base;
179 DEFINE_RWLOCK(dev_base_lock);
181 EXPORT_SYMBOL(dev_base);
182 EXPORT_SYMBOL(dev_base_lock);
184 #define NETDEV_HASHBITS 8
185 static struct hlist_head dev_name_head[1<<NETDEV_HASHBITS];
186 static struct hlist_head dev_index_head[1<<NETDEV_HASHBITS];
188 static inline struct hlist_head *dev_name_hash(const char *name)
190 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
191 return &dev_name_head[hash & ((1<<NETDEV_HASHBITS)-1)];
194 static inline struct hlist_head *dev_index_hash(int ifindex)
196 return &dev_index_head[ifindex & ((1<<NETDEV_HASHBITS)-1)];
203 static RAW_NOTIFIER_HEAD(netdev_chain);
206 * Device drivers call our routines to queue packets here. We empty the
207 * queue in the local softnet handler.
209 DEFINE_PER_CPU(struct softnet_data, softnet_data) = { NULL };
212 extern int netdev_sysfs_init(void);
213 extern int netdev_register_sysfs(struct net_device *);
214 extern void netdev_unregister_sysfs(struct net_device *);
216 #define netdev_sysfs_init() (0)
217 #define netdev_register_sysfs(dev) (0)
218 #define netdev_unregister_sysfs(dev) do { } while(0)
222 /*******************************************************************************
224 Protocol management and registration routines
226 *******************************************************************************/
232 static int netdev_nit;
235 * Add a protocol ID to the list. Now that the input handler is
236 * smarter we can dispense with all the messy stuff that used to be
239 * BEWARE!!! Protocol handlers, mangling input packets,
240 * MUST BE last in hash buckets and checking protocol handlers
241 * MUST start from promiscuous ptype_all chain in net_bh.
242 * It is true now, do not change it.
243 * Explanation follows: if protocol handler, mangling packet, will
244 * be the first on list, it is not able to sense, that packet
245 * is cloned and should be copied-on-write, so that it will
246 * change it and subsequent readers will get broken packet.
251 * dev_add_pack - add packet handler
252 * @pt: packet type declaration
254 * Add a protocol handler to the networking stack. The passed &packet_type
255 * is linked into kernel lists and may not be freed until it has been
256 * removed from the kernel lists.
258 * This call does not sleep therefore it can not
259 * guarantee all CPU's that are in middle of receiving packets
260 * will see the new packet type (until the next received packet).
263 void dev_add_pack(struct packet_type *pt)
267 spin_lock_bh(&ptype_lock);
268 if (pt->type == htons(ETH_P_ALL)) {
270 list_add_rcu(&pt->list, &ptype_all);
272 hash = ntohs(pt->type) & 15;
273 list_add_rcu(&pt->list, &ptype_base[hash]);
275 spin_unlock_bh(&ptype_lock);
279 * __dev_remove_pack - remove packet handler
280 * @pt: packet type declaration
282 * Remove a protocol handler that was previously added to the kernel
283 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
284 * from the kernel lists and can be freed or reused once this function
287 * The packet type might still be in use by receivers
288 * and must not be freed until after all the CPU's have gone
289 * through a quiescent state.
291 void __dev_remove_pack(struct packet_type *pt)
293 struct list_head *head;
294 struct packet_type *pt1;
296 spin_lock_bh(&ptype_lock);
298 if (pt->type == htons(ETH_P_ALL)) {
302 head = &ptype_base[ntohs(pt->type) & 15];
304 list_for_each_entry(pt1, head, list) {
306 list_del_rcu(&pt->list);
311 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
313 spin_unlock_bh(&ptype_lock);
316 * dev_remove_pack - remove packet handler
317 * @pt: packet type declaration
319 * Remove a protocol handler that was previously added to the kernel
320 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
321 * from the kernel lists and can be freed or reused once this function
324 * This call sleeps to guarantee that no CPU is looking at the packet
327 void dev_remove_pack(struct packet_type *pt)
329 __dev_remove_pack(pt);
334 /******************************************************************************
336 Device Boot-time Settings Routines
338 *******************************************************************************/
340 /* Boot time configuration table */
341 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
344 * netdev_boot_setup_add - add new setup entry
345 * @name: name of the device
346 * @map: configured settings for the device
348 * Adds new setup entry to the dev_boot_setup list. The function
349 * returns 0 on error and 1 on success. This is a generic routine to
352 static int netdev_boot_setup_add(char *name, struct ifmap *map)
354 struct netdev_boot_setup *s;
358 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
359 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
360 memset(s[i].name, 0, sizeof(s[i].name));
361 strcpy(s[i].name, name);
362 memcpy(&s[i].map, map, sizeof(s[i].map));
367 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
371 * netdev_boot_setup_check - check boot time settings
372 * @dev: the netdevice
374 * Check boot time settings for the device.
375 * The found settings are set for the device to be used
376 * later in the device probing.
377 * Returns 0 if no settings found, 1 if they are.
379 int netdev_boot_setup_check(struct net_device *dev)
381 struct netdev_boot_setup *s = dev_boot_setup;
384 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
385 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
386 !strncmp(dev->name, s[i].name, strlen(s[i].name))) {
387 dev->irq = s[i].map.irq;
388 dev->base_addr = s[i].map.base_addr;
389 dev->mem_start = s[i].map.mem_start;
390 dev->mem_end = s[i].map.mem_end;
399 * netdev_boot_base - get address from boot time settings
400 * @prefix: prefix for network device
401 * @unit: id for network device
403 * Check boot time settings for the base address of device.
404 * The found settings are set for the device to be used
405 * later in the device probing.
406 * Returns 0 if no settings found.
408 unsigned long netdev_boot_base(const char *prefix, int unit)
410 const struct netdev_boot_setup *s = dev_boot_setup;
414 sprintf(name, "%s%d", prefix, unit);
417 * If device already registered then return base of 1
418 * to indicate not to probe for this interface
420 if (__dev_get_by_name(name))
423 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
424 if (!strcmp(name, s[i].name))
425 return s[i].map.base_addr;
430 * Saves at boot time configured settings for any netdevice.
432 int __init netdev_boot_setup(char *str)
437 str = get_options(str, ARRAY_SIZE(ints), ints);
442 memset(&map, 0, sizeof(map));
446 map.base_addr = ints[2];
448 map.mem_start = ints[3];
450 map.mem_end = ints[4];
452 /* Add new entry to the list */
453 return netdev_boot_setup_add(str, &map);
456 __setup("netdev=", netdev_boot_setup);
458 /*******************************************************************************
460 Device Interface Subroutines
462 *******************************************************************************/
465 * __dev_get_by_name - find a device by its name
466 * @name: name to find
468 * Find an interface by name. Must be called under RTNL semaphore
469 * or @dev_base_lock. If the name is found a pointer to the device
470 * is returned. If the name is not found then %NULL is returned. The
471 * reference counters are not incremented so the caller must be
472 * careful with locks.
475 struct net_device *__dev_get_by_name(const char *name)
477 struct hlist_node *p;
479 hlist_for_each(p, dev_name_hash(name)) {
480 struct net_device *dev
481 = hlist_entry(p, struct net_device, name_hlist);
482 if (!strncmp(dev->name, name, IFNAMSIZ))
489 * dev_get_by_name - find a device by its name
490 * @name: name to find
492 * Find an interface by name. This can be called from any
493 * context and does its own locking. The returned handle has
494 * the usage count incremented and the caller must use dev_put() to
495 * release it when it is no longer needed. %NULL is returned if no
496 * matching device is found.
499 struct net_device *dev_get_by_name(const char *name)
501 struct net_device *dev;
503 read_lock(&dev_base_lock);
504 dev = __dev_get_by_name(name);
507 read_unlock(&dev_base_lock);
512 * __dev_get_by_index - find a device by its ifindex
513 * @ifindex: index of device
515 * Search for an interface by index. Returns %NULL if the device
516 * is not found or a pointer to the device. The device has not
517 * had its reference counter increased so the caller must be careful
518 * about locking. The caller must hold either the RTNL semaphore
522 struct net_device *__dev_get_by_index(int ifindex)
524 struct hlist_node *p;
526 hlist_for_each(p, dev_index_hash(ifindex)) {
527 struct net_device *dev
528 = hlist_entry(p, struct net_device, index_hlist);
529 if (dev->ifindex == ifindex)
537 * dev_get_by_index - find a device by its ifindex
538 * @ifindex: index of device
540 * Search for an interface by index. Returns NULL if the device
541 * is not found or a pointer to the device. The device returned has
542 * had a reference added and the pointer is safe until the user calls
543 * dev_put to indicate they have finished with it.
546 struct net_device *dev_get_by_index(int ifindex)
548 struct net_device *dev;
550 read_lock(&dev_base_lock);
551 dev = __dev_get_by_index(ifindex);
554 read_unlock(&dev_base_lock);
559 * dev_getbyhwaddr - find a device by its hardware address
560 * @type: media type of device
561 * @ha: hardware address
563 * Search for an interface by MAC address. Returns NULL if the device
564 * is not found or a pointer to the device. The caller must hold the
565 * rtnl semaphore. The returned device has not had its ref count increased
566 * and the caller must therefore be careful about locking
569 * If the API was consistent this would be __dev_get_by_hwaddr
572 struct net_device *dev_getbyhwaddr(unsigned short type, char *ha)
574 struct net_device *dev;
578 for (dev = dev_base; dev; dev = dev->next)
579 if (dev->type == type &&
580 !memcmp(dev->dev_addr, ha, dev->addr_len))
585 EXPORT_SYMBOL(dev_getbyhwaddr);
587 struct net_device *dev_getfirstbyhwtype(unsigned short type)
589 struct net_device *dev;
592 for (dev = dev_base; dev; dev = dev->next) {
593 if (dev->type == type) {
602 EXPORT_SYMBOL(dev_getfirstbyhwtype);
605 * dev_get_by_flags - find any device with given flags
606 * @if_flags: IFF_* values
607 * @mask: bitmask of bits in if_flags to check
609 * Search for any interface with the given flags. Returns NULL if a device
610 * is not found or a pointer to the device. The device returned has
611 * had a reference added and the pointer is safe until the user calls
612 * dev_put to indicate they have finished with it.
615 struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mask)
617 struct net_device *dev;
619 read_lock(&dev_base_lock);
620 for (dev = dev_base; dev != NULL; dev = dev->next) {
621 if (((dev->flags ^ if_flags) & mask) == 0) {
626 read_unlock(&dev_base_lock);
631 * dev_valid_name - check if name is okay for network device
634 * Network device names need to be valid file names to
635 * to allow sysfs to work. We also disallow any kind of
638 int dev_valid_name(const char *name)
642 if (strlen(name) >= IFNAMSIZ)
644 if (!strcmp(name, ".") || !strcmp(name, ".."))
648 if (*name == '/' || isspace(*name))
656 * dev_alloc_name - allocate a name for a device
658 * @name: name format string
660 * Passed a format string - eg "lt%d" it will try and find a suitable
661 * id. It scans list of devices to build up a free map, then chooses
662 * the first empty slot. The caller must hold the dev_base or rtnl lock
663 * while allocating the name and adding the device in order to avoid
665 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
666 * Returns the number of the unit assigned or a negative errno code.
669 int dev_alloc_name(struct net_device *dev, const char *name)
674 const int max_netdevices = 8*PAGE_SIZE;
676 struct net_device *d;
678 p = strnchr(name, IFNAMSIZ-1, '%');
681 * Verify the string as this thing may have come from
682 * the user. There must be either one "%d" and no other "%"
685 if (p[1] != 'd' || strchr(p + 2, '%'))
688 /* Use one page as a bit array of possible slots */
689 inuse = (long *) get_zeroed_page(GFP_ATOMIC);
693 for (d = dev_base; d; d = d->next) {
694 if (!sscanf(d->name, name, &i))
696 if (i < 0 || i >= max_netdevices)
699 /* avoid cases where sscanf is not exact inverse of printf */
700 snprintf(buf, sizeof(buf), name, i);
701 if (!strncmp(buf, d->name, IFNAMSIZ))
705 i = find_first_zero_bit(inuse, max_netdevices);
706 free_page((unsigned long) inuse);
709 snprintf(buf, sizeof(buf), name, i);
710 if (!__dev_get_by_name(buf)) {
711 strlcpy(dev->name, buf, IFNAMSIZ);
715 /* It is possible to run out of possible slots
716 * when the name is long and there isn't enough space left
717 * for the digits, or if all bits are used.
724 * dev_change_name - change name of a device
726 * @newname: name (or format string) must be at least IFNAMSIZ
728 * Change name of a device, can pass format strings "eth%d".
731 int dev_change_name(struct net_device *dev, char *newname)
737 if (dev->flags & IFF_UP)
740 if (!dev_valid_name(newname))
743 if (strchr(newname, '%')) {
744 err = dev_alloc_name(dev, newname);
747 strcpy(newname, dev->name);
749 else if (__dev_get_by_name(newname))
752 strlcpy(dev->name, newname, IFNAMSIZ);
754 device_rename(&dev->dev, dev->name);
755 hlist_del(&dev->name_hlist);
756 hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name));
757 raw_notifier_call_chain(&netdev_chain, NETDEV_CHANGENAME, dev);
763 * netdev_features_change - device changes features
764 * @dev: device to cause notification
766 * Called to indicate a device has changed features.
768 void netdev_features_change(struct net_device *dev)
770 raw_notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
772 EXPORT_SYMBOL(netdev_features_change);
775 * netdev_state_change - device changes state
776 * @dev: device to cause notification
778 * Called to indicate a device has changed state. This function calls
779 * the notifier chains for netdev_chain and sends a NEWLINK message
780 * to the routing socket.
782 void netdev_state_change(struct net_device *dev)
784 if (dev->flags & IFF_UP) {
785 raw_notifier_call_chain(&netdev_chain,
787 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
792 * dev_load - load a network module
793 * @name: name of interface
795 * If a network interface is not present and the process has suitable
796 * privileges this function loads the module. If module loading is not
797 * available in this kernel then it becomes a nop.
800 void dev_load(const char *name)
802 struct net_device *dev;
804 read_lock(&dev_base_lock);
805 dev = __dev_get_by_name(name);
806 read_unlock(&dev_base_lock);
808 if (!dev && capable(CAP_SYS_MODULE))
809 request_module("%s", name);
812 static int default_rebuild_header(struct sk_buff *skb)
814 printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
815 skb->dev ? skb->dev->name : "NULL!!!");
821 * dev_open - prepare an interface for use.
822 * @dev: device to open
824 * Takes a device from down to up state. The device's private open
825 * function is invoked and then the multicast lists are loaded. Finally
826 * the device is moved into the up state and a %NETDEV_UP message is
827 * sent to the netdev notifier chain.
829 * Calling this function on an active interface is a nop. On a failure
830 * a negative errno code is returned.
832 int dev_open(struct net_device *dev)
840 if (dev->flags & IFF_UP)
844 * Is it even present?
846 if (!netif_device_present(dev))
850 * Call device private open method
852 set_bit(__LINK_STATE_START, &dev->state);
854 ret = dev->open(dev);
856 clear_bit(__LINK_STATE_START, &dev->state);
860 * If it went open OK then:
867 dev->flags |= IFF_UP;
870 * Initialize multicasting status
875 * Wakeup transmit queue engine
880 * ... and announce new interface.
882 raw_notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
888 * dev_close - shutdown an interface.
889 * @dev: device to shutdown
891 * This function moves an active device into down state. A
892 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
893 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
896 int dev_close(struct net_device *dev)
898 if (!(dev->flags & IFF_UP))
902 * Tell people we are going down, so that they can
903 * prepare to death, when device is still operating.
905 raw_notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
909 clear_bit(__LINK_STATE_START, &dev->state);
911 /* Synchronize to scheduled poll. We cannot touch poll list,
912 * it can be even on different cpu. So just clear netif_running(),
913 * and wait when poll really will happen. Actually, the best place
914 * for this is inside dev->stop() after device stopped its irq
915 * engine, but this requires more changes in devices. */
917 smp_mb__after_clear_bit(); /* Commit netif_running(). */
918 while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
924 * Call the device specific close. This cannot fail.
925 * Only if device is UP
927 * We allow it to be called even after a DETACH hot-plug
934 * Device is now down.
937 dev->flags &= ~IFF_UP;
940 * Tell people we are down
942 raw_notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
949 * Device change register/unregister. These are not inline or static
950 * as we export them to the world.
954 * register_netdevice_notifier - register a network notifier block
957 * Register a notifier to be called when network device events occur.
958 * The notifier passed is linked into the kernel structures and must
959 * not be reused until it has been unregistered. A negative errno code
960 * is returned on a failure.
962 * When registered all registration and up events are replayed
963 * to the new notifier to allow device to have a race free
964 * view of the network device list.
967 int register_netdevice_notifier(struct notifier_block *nb)
969 struct net_device *dev;
973 err = raw_notifier_chain_register(&netdev_chain, nb);
975 for (dev = dev_base; dev; dev = dev->next) {
976 nb->notifier_call(nb, NETDEV_REGISTER, dev);
978 if (dev->flags & IFF_UP)
979 nb->notifier_call(nb, NETDEV_UP, dev);
987 * unregister_netdevice_notifier - unregister a network notifier block
990 * Unregister a notifier previously registered by
991 * register_netdevice_notifier(). The notifier is unlinked into the
992 * kernel structures and may then be reused. A negative errno code
993 * is returned on a failure.
996 int unregister_netdevice_notifier(struct notifier_block *nb)
1001 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1007 * call_netdevice_notifiers - call all network notifier blocks
1008 * @val: value passed unmodified to notifier function
1009 * @v: pointer passed unmodified to notifier function
1011 * Call all network notifier blocks. Parameters and return value
1012 * are as for raw_notifier_call_chain().
1015 int call_netdevice_notifiers(unsigned long val, void *v)
1017 return raw_notifier_call_chain(&netdev_chain, val, v);
1020 /* When > 0 there are consumers of rx skb time stamps */
1021 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1023 void net_enable_timestamp(void)
1025 atomic_inc(&netstamp_needed);
1028 void net_disable_timestamp(void)
1030 atomic_dec(&netstamp_needed);
1033 static inline void net_timestamp(struct sk_buff *skb)
1035 if (atomic_read(&netstamp_needed))
1036 __net_timestamp(skb);
1038 skb->tstamp.tv64 = 0;
1042 * Support routine. Sends outgoing frames to any network
1043 * taps currently in use.
1046 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1048 struct packet_type *ptype;
1053 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1054 /* Never send packets back to the socket
1055 * they originated from - MvS (miquels@drinkel.ow.org)
1057 if ((ptype->dev == dev || !ptype->dev) &&
1058 (ptype->af_packet_priv == NULL ||
1059 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1060 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1064 /* skb->nh should be correctly
1065 set by sender, so that the second statement is
1066 just protection against buggy protocols.
1068 skb_reset_mac_header(skb2);
1070 if (skb_network_header(skb2) < skb2->data ||
1071 skb2->network_header > skb2->tail) {
1072 if (net_ratelimit())
1073 printk(KERN_CRIT "protocol %04x is "
1075 skb2->protocol, dev->name);
1076 skb_reset_network_header(skb2);
1079 skb2->transport_header = skb2->network_header;
1080 skb2->pkt_type = PACKET_OUTGOING;
1081 ptype->func(skb2, skb->dev, ptype, skb->dev);
1088 void __netif_schedule(struct net_device *dev)
1090 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
1091 unsigned long flags;
1092 struct softnet_data *sd;
1094 local_irq_save(flags);
1095 sd = &__get_cpu_var(softnet_data);
1096 dev->next_sched = sd->output_queue;
1097 sd->output_queue = dev;
1098 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1099 local_irq_restore(flags);
1102 EXPORT_SYMBOL(__netif_schedule);
1104 void __netif_rx_schedule(struct net_device *dev)
1106 unsigned long flags;
1108 local_irq_save(flags);
1110 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
1112 dev->quota += dev->weight;
1114 dev->quota = dev->weight;
1115 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
1116 local_irq_restore(flags);
1118 EXPORT_SYMBOL(__netif_rx_schedule);
1120 void dev_kfree_skb_any(struct sk_buff *skb)
1122 if (in_irq() || irqs_disabled())
1123 dev_kfree_skb_irq(skb);
1127 EXPORT_SYMBOL(dev_kfree_skb_any);
1131 void netif_device_detach(struct net_device *dev)
1133 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1134 netif_running(dev)) {
1135 netif_stop_queue(dev);
1138 EXPORT_SYMBOL(netif_device_detach);
1140 void netif_device_attach(struct net_device *dev)
1142 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1143 netif_running(dev)) {
1144 netif_wake_queue(dev);
1145 __netdev_watchdog_up(dev);
1148 EXPORT_SYMBOL(netif_device_attach);
1152 * Invalidate hardware checksum when packet is to be mangled, and
1153 * complete checksum manually on outgoing path.
1155 int skb_checksum_help(struct sk_buff *skb)
1158 int ret = 0, offset;
1160 if (skb->ip_summed == CHECKSUM_COMPLETE)
1161 goto out_set_summed;
1163 if (unlikely(skb_shinfo(skb)->gso_size)) {
1164 /* Let GSO fix up the checksum. */
1165 goto out_set_summed;
1168 if (skb_cloned(skb)) {
1169 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1174 offset = skb->csum_start - skb_headroom(skb);
1175 BUG_ON(offset > (int)skb->len);
1176 csum = skb_checksum(skb, offset, skb->len-offset, 0);
1178 offset = skb_headlen(skb) - offset;
1179 BUG_ON(offset <= 0);
1180 BUG_ON(skb->csum_offset + 2 > offset);
1182 *(__sum16 *)(skb->head + skb->csum_start + skb->csum_offset) =
1185 skb->ip_summed = CHECKSUM_NONE;
1191 * skb_gso_segment - Perform segmentation on skb.
1192 * @skb: buffer to segment
1193 * @features: features for the output path (see dev->features)
1195 * This function segments the given skb and returns a list of segments.
1197 * It may return NULL if the skb requires no segmentation. This is
1198 * only possible when GSO is used for verifying header integrity.
1200 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1202 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1203 struct packet_type *ptype;
1204 __be16 type = skb->protocol;
1207 BUG_ON(skb_shinfo(skb)->frag_list);
1209 skb_reset_mac_header(skb);
1210 skb->mac_len = skb->network_header - skb->mac_header;
1211 __skb_pull(skb, skb->mac_len);
1213 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1214 if (skb_header_cloned(skb) &&
1215 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1216 return ERR_PTR(err);
1220 list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type) & 15], list) {
1221 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1222 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1223 err = ptype->gso_send_check(skb);
1224 segs = ERR_PTR(err);
1225 if (err || skb_gso_ok(skb, features))
1227 __skb_push(skb, (skb->data -
1228 skb_network_header(skb)));
1230 segs = ptype->gso_segment(skb, features);
1236 __skb_push(skb, skb->data - skb_mac_header(skb));
1241 EXPORT_SYMBOL(skb_gso_segment);
1243 /* Take action when hardware reception checksum errors are detected. */
1245 void netdev_rx_csum_fault(struct net_device *dev)
1247 if (net_ratelimit()) {
1248 printk(KERN_ERR "%s: hw csum failure.\n",
1249 dev ? dev->name : "<unknown>");
1253 EXPORT_SYMBOL(netdev_rx_csum_fault);
1256 /* Actually, we should eliminate this check as soon as we know, that:
1257 * 1. IOMMU is present and allows to map all the memory.
1258 * 2. No high memory really exists on this machine.
1261 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1263 #ifdef CONFIG_HIGHMEM
1266 if (dev->features & NETIF_F_HIGHDMA)
1269 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1270 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1278 void (*destructor)(struct sk_buff *skb);
1281 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1283 static void dev_gso_skb_destructor(struct sk_buff *skb)
1285 struct dev_gso_cb *cb;
1288 struct sk_buff *nskb = skb->next;
1290 skb->next = nskb->next;
1293 } while (skb->next);
1295 cb = DEV_GSO_CB(skb);
1297 cb->destructor(skb);
1301 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1302 * @skb: buffer to segment
1304 * This function segments the given skb and stores the list of segments
1307 static int dev_gso_segment(struct sk_buff *skb)
1309 struct net_device *dev = skb->dev;
1310 struct sk_buff *segs;
1311 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1314 segs = skb_gso_segment(skb, features);
1316 /* Verifying header integrity only. */
1320 if (unlikely(IS_ERR(segs)))
1321 return PTR_ERR(segs);
1324 DEV_GSO_CB(skb)->destructor = skb->destructor;
1325 skb->destructor = dev_gso_skb_destructor;
1330 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
1332 if (likely(!skb->next)) {
1334 dev_queue_xmit_nit(skb, dev);
1336 if (netif_needs_gso(dev, skb)) {
1337 if (unlikely(dev_gso_segment(skb)))
1343 return dev->hard_start_xmit(skb, dev);
1348 struct sk_buff *nskb = skb->next;
1351 skb->next = nskb->next;
1353 rc = dev->hard_start_xmit(nskb, dev);
1355 nskb->next = skb->next;
1359 if (unlikely(netif_queue_stopped(dev) && skb->next))
1360 return NETDEV_TX_BUSY;
1361 } while (skb->next);
1363 skb->destructor = DEV_GSO_CB(skb)->destructor;
1370 #define HARD_TX_LOCK(dev, cpu) { \
1371 if ((dev->features & NETIF_F_LLTX) == 0) { \
1372 netif_tx_lock(dev); \
1376 #define HARD_TX_UNLOCK(dev) { \
1377 if ((dev->features & NETIF_F_LLTX) == 0) { \
1378 netif_tx_unlock(dev); \
1383 * dev_queue_xmit - transmit a buffer
1384 * @skb: buffer to transmit
1386 * Queue a buffer for transmission to a network device. The caller must
1387 * have set the device and priority and built the buffer before calling
1388 * this function. The function can be called from an interrupt.
1390 * A negative errno code is returned on a failure. A success does not
1391 * guarantee the frame will be transmitted as it may be dropped due
1392 * to congestion or traffic shaping.
1394 * -----------------------------------------------------------------------------------
1395 * I notice this method can also return errors from the queue disciplines,
1396 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1399 * Regardless of the return value, the skb is consumed, so it is currently
1400 * difficult to retry a send to this method. (You can bump the ref count
1401 * before sending to hold a reference for retry if you are careful.)
1403 * When calling this method, interrupts MUST be enabled. This is because
1404 * the BH enable code must have IRQs enabled so that it will not deadlock.
1408 int dev_queue_xmit(struct sk_buff *skb)
1410 struct net_device *dev = skb->dev;
1414 /* GSO will handle the following emulations directly. */
1415 if (netif_needs_gso(dev, skb))
1418 if (skb_shinfo(skb)->frag_list &&
1419 !(dev->features & NETIF_F_FRAGLIST) &&
1420 __skb_linearize(skb))
1423 /* Fragmented skb is linearized if device does not support SG,
1424 * or if at least one of fragments is in highmem and device
1425 * does not support DMA from it.
1427 if (skb_shinfo(skb)->nr_frags &&
1428 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1429 __skb_linearize(skb))
1432 /* If packet is not checksummed and device does not support
1433 * checksumming for this protocol, complete checksumming here.
1435 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1436 skb_set_transport_header(skb, skb->csum_start -
1439 if (!(dev->features & NETIF_F_GEN_CSUM) &&
1440 (!(dev->features & NETIF_F_IP_CSUM) ||
1441 skb->protocol != htons(ETH_P_IP)))
1442 if (skb_checksum_help(skb))
1447 spin_lock_prefetch(&dev->queue_lock);
1449 /* Disable soft irqs for various locks below. Also
1450 * stops preemption for RCU.
1454 /* Updates of qdisc are serialized by queue_lock.
1455 * The struct Qdisc which is pointed to by qdisc is now a
1456 * rcu structure - it may be accessed without acquiring
1457 * a lock (but the structure may be stale.) The freeing of the
1458 * qdisc will be deferred until it's known that there are no
1459 * more references to it.
1461 * If the qdisc has an enqueue function, we still need to
1462 * hold the queue_lock before calling it, since queue_lock
1463 * also serializes access to the device queue.
1466 q = rcu_dereference(dev->qdisc);
1467 #ifdef CONFIG_NET_CLS_ACT
1468 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1471 /* Grab device queue */
1472 spin_lock(&dev->queue_lock);
1475 rc = q->enqueue(skb, q);
1477 spin_unlock(&dev->queue_lock);
1479 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1482 spin_unlock(&dev->queue_lock);
1485 /* The device has no queue. Common case for software devices:
1486 loopback, all the sorts of tunnels...
1488 Really, it is unlikely that netif_tx_lock protection is necessary
1489 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1491 However, it is possible, that they rely on protection
1494 Check this and shot the lock. It is not prone from deadlocks.
1495 Either shot noqueue qdisc, it is even simpler 8)
1497 if (dev->flags & IFF_UP) {
1498 int cpu = smp_processor_id(); /* ok because BHs are off */
1500 if (dev->xmit_lock_owner != cpu) {
1502 HARD_TX_LOCK(dev, cpu);
1504 if (!netif_queue_stopped(dev)) {
1506 if (!dev_hard_start_xmit(skb, dev)) {
1507 HARD_TX_UNLOCK(dev);
1511 HARD_TX_UNLOCK(dev);
1512 if (net_ratelimit())
1513 printk(KERN_CRIT "Virtual device %s asks to "
1514 "queue packet!\n", dev->name);
1516 /* Recursion is detected! It is possible,
1518 if (net_ratelimit())
1519 printk(KERN_CRIT "Dead loop on virtual device "
1520 "%s, fix it urgently!\n", dev->name);
1525 rcu_read_unlock_bh();
1531 rcu_read_unlock_bh();
1536 /*=======================================================================
1538 =======================================================================*/
1540 int netdev_max_backlog __read_mostly = 1000;
1541 int netdev_budget __read_mostly = 300;
1542 int weight_p __read_mostly = 64; /* old backlog weight */
1544 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1548 * netif_rx - post buffer to the network code
1549 * @skb: buffer to post
1551 * This function receives a packet from a device driver and queues it for
1552 * the upper (protocol) levels to process. It always succeeds. The buffer
1553 * may be dropped during processing for congestion control or by the
1557 * NET_RX_SUCCESS (no congestion)
1558 * NET_RX_CN_LOW (low congestion)
1559 * NET_RX_CN_MOD (moderate congestion)
1560 * NET_RX_CN_HIGH (high congestion)
1561 * NET_RX_DROP (packet was dropped)
1565 int netif_rx(struct sk_buff *skb)
1567 struct softnet_data *queue;
1568 unsigned long flags;
1570 /* if netpoll wants it, pretend we never saw it */
1571 if (netpoll_rx(skb))
1574 if (!skb->tstamp.tv64)
1578 * The code is rearranged so that the path is the most
1579 * short when CPU is congested, but is still operating.
1581 local_irq_save(flags);
1582 queue = &__get_cpu_var(softnet_data);
1584 __get_cpu_var(netdev_rx_stat).total++;
1585 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1586 if (queue->input_pkt_queue.qlen) {
1589 __skb_queue_tail(&queue->input_pkt_queue, skb);
1590 local_irq_restore(flags);
1591 return NET_RX_SUCCESS;
1594 netif_rx_schedule(&queue->backlog_dev);
1598 __get_cpu_var(netdev_rx_stat).dropped++;
1599 local_irq_restore(flags);
1605 int netif_rx_ni(struct sk_buff *skb)
1610 err = netif_rx(skb);
1611 if (local_softirq_pending())
1618 EXPORT_SYMBOL(netif_rx_ni);
1620 static inline struct net_device *skb_bond(struct sk_buff *skb)
1622 struct net_device *dev = skb->dev;
1625 if (skb_bond_should_drop(skb)) {
1629 skb->dev = dev->master;
1635 static void net_tx_action(struct softirq_action *h)
1637 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1639 if (sd->completion_queue) {
1640 struct sk_buff *clist;
1642 local_irq_disable();
1643 clist = sd->completion_queue;
1644 sd->completion_queue = NULL;
1648 struct sk_buff *skb = clist;
1649 clist = clist->next;
1651 BUG_TRAP(!atomic_read(&skb->users));
1656 if (sd->output_queue) {
1657 struct net_device *head;
1659 local_irq_disable();
1660 head = sd->output_queue;
1661 sd->output_queue = NULL;
1665 struct net_device *dev = head;
1666 head = head->next_sched;
1668 smp_mb__before_clear_bit();
1669 clear_bit(__LINK_STATE_SCHED, &dev->state);
1671 if (spin_trylock(&dev->queue_lock)) {
1673 spin_unlock(&dev->queue_lock);
1675 netif_schedule(dev);
1681 static inline int deliver_skb(struct sk_buff *skb,
1682 struct packet_type *pt_prev,
1683 struct net_device *orig_dev)
1685 atomic_inc(&skb->users);
1686 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1689 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1690 /* These hooks defined here for ATM */
1692 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1693 unsigned char *addr);
1694 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly;
1697 * If bridge module is loaded call bridging hook.
1698 * returns NULL if packet was consumed.
1700 struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p,
1701 struct sk_buff *skb) __read_mostly;
1702 static inline struct sk_buff *handle_bridge(struct sk_buff *skb,
1703 struct packet_type **pt_prev, int *ret,
1704 struct net_device *orig_dev)
1706 struct net_bridge_port *port;
1708 if (skb->pkt_type == PACKET_LOOPBACK ||
1709 (port = rcu_dereference(skb->dev->br_port)) == NULL)
1713 *ret = deliver_skb(skb, *pt_prev, orig_dev);
1717 return br_handle_frame_hook(port, skb);
1720 #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb)
1723 #ifdef CONFIG_NET_CLS_ACT
1724 /* TODO: Maybe we should just force sch_ingress to be compiled in
1725 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
1726 * a compare and 2 stores extra right now if we dont have it on
1727 * but have CONFIG_NET_CLS_ACT
1728 * NOTE: This doesnt stop any functionality; if you dont have
1729 * the ingress scheduler, you just cant add policies on ingress.
1732 static int ing_filter(struct sk_buff *skb)
1735 struct net_device *dev = skb->dev;
1736 int result = TC_ACT_OK;
1738 if (dev->qdisc_ingress) {
1739 __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
1740 if (MAX_RED_LOOP < ttl++) {
1741 printk(KERN_WARNING "Redir loop detected Dropping packet (%d->%d)\n",
1742 skb->iif, skb->dev->ifindex);
1746 skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl);
1748 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS);
1750 spin_lock(&dev->queue_lock);
1751 if ((q = dev->qdisc_ingress) != NULL)
1752 result = q->enqueue(skb, q);
1753 spin_unlock(&dev->queue_lock);
1761 int netif_receive_skb(struct sk_buff *skb)
1763 struct packet_type *ptype, *pt_prev;
1764 struct net_device *orig_dev;
1765 int ret = NET_RX_DROP;
1768 /* if we've gotten here through NAPI, check netpoll */
1769 if (skb->dev->poll && netpoll_rx(skb))
1772 if (!skb->tstamp.tv64)
1776 skb->iif = skb->dev->ifindex;
1778 orig_dev = skb_bond(skb);
1783 __get_cpu_var(netdev_rx_stat).total++;
1785 skb_reset_network_header(skb);
1786 skb_reset_transport_header(skb);
1787 skb->mac_len = skb->network_header - skb->mac_header;
1793 #ifdef CONFIG_NET_CLS_ACT
1794 if (skb->tc_verd & TC_NCLS) {
1795 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
1800 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1801 if (!ptype->dev || ptype->dev == skb->dev) {
1803 ret = deliver_skb(skb, pt_prev, orig_dev);
1808 #ifdef CONFIG_NET_CLS_ACT
1810 ret = deliver_skb(skb, pt_prev, orig_dev);
1811 pt_prev = NULL; /* noone else should process this after*/
1813 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
1816 ret = ing_filter(skb);
1818 if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
1827 skb = handle_bridge(skb, &pt_prev, &ret, orig_dev);
1831 type = skb->protocol;
1832 list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {
1833 if (ptype->type == type &&
1834 (!ptype->dev || ptype->dev == skb->dev)) {
1836 ret = deliver_skb(skb, pt_prev, orig_dev);
1842 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1845 /* Jamal, now you will not able to escape explaining
1846 * me how you were going to use this. :-)
1856 static int process_backlog(struct net_device *backlog_dev, int *budget)
1859 int quota = min(backlog_dev->quota, *budget);
1860 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1861 unsigned long start_time = jiffies;
1863 backlog_dev->weight = weight_p;
1865 struct sk_buff *skb;
1866 struct net_device *dev;
1868 local_irq_disable();
1869 skb = __skb_dequeue(&queue->input_pkt_queue);
1876 netif_receive_skb(skb);
1882 if (work >= quota || jiffies - start_time > 1)
1887 backlog_dev->quota -= work;
1892 backlog_dev->quota -= work;
1895 list_del(&backlog_dev->poll_list);
1896 smp_mb__before_clear_bit();
1897 netif_poll_enable(backlog_dev);
1903 static void net_rx_action(struct softirq_action *h)
1905 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1906 unsigned long start_time = jiffies;
1907 int budget = netdev_budget;
1910 local_irq_disable();
1912 while (!list_empty(&queue->poll_list)) {
1913 struct net_device *dev;
1915 if (budget <= 0 || jiffies - start_time > 1)
1920 dev = list_entry(queue->poll_list.next,
1921 struct net_device, poll_list);
1922 have = netpoll_poll_lock(dev);
1924 if (dev->quota <= 0 || dev->poll(dev, &budget)) {
1925 netpoll_poll_unlock(have);
1926 local_irq_disable();
1927 list_move_tail(&dev->poll_list, &queue->poll_list);
1929 dev->quota += dev->weight;
1931 dev->quota = dev->weight;
1933 netpoll_poll_unlock(have);
1935 local_irq_disable();
1939 #ifdef CONFIG_NET_DMA
1941 * There may not be any more sk_buffs coming right now, so push
1942 * any pending DMA copies to hardware
1944 if (net_dma_client) {
1945 struct dma_chan *chan;
1947 list_for_each_entry_rcu(chan, &net_dma_client->channels, client_node)
1948 dma_async_memcpy_issue_pending(chan);
1956 __get_cpu_var(netdev_rx_stat).time_squeeze++;
1957 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
1961 static gifconf_func_t * gifconf_list [NPROTO];
1964 * register_gifconf - register a SIOCGIF handler
1965 * @family: Address family
1966 * @gifconf: Function handler
1968 * Register protocol dependent address dumping routines. The handler
1969 * that is passed must not be freed or reused until it has been replaced
1970 * by another handler.
1972 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
1974 if (family >= NPROTO)
1976 gifconf_list[family] = gifconf;
1982 * Map an interface index to its name (SIOCGIFNAME)
1986 * We need this ioctl for efficient implementation of the
1987 * if_indextoname() function required by the IPv6 API. Without
1988 * it, we would have to search all the interfaces to find a
1992 static int dev_ifname(struct ifreq __user *arg)
1994 struct net_device *dev;
1998 * Fetch the caller's info block.
2001 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2004 read_lock(&dev_base_lock);
2005 dev = __dev_get_by_index(ifr.ifr_ifindex);
2007 read_unlock(&dev_base_lock);
2011 strcpy(ifr.ifr_name, dev->name);
2012 read_unlock(&dev_base_lock);
2014 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2020 * Perform a SIOCGIFCONF call. This structure will change
2021 * size eventually, and there is nothing I can do about it.
2022 * Thus we will need a 'compatibility mode'.
2025 static int dev_ifconf(char __user *arg)
2028 struct net_device *dev;
2035 * Fetch the caller's info block.
2038 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2045 * Loop over the interfaces, and write an info block for each.
2049 for (dev = dev_base; dev; dev = dev->next) {
2050 for (i = 0; i < NPROTO; i++) {
2051 if (gifconf_list[i]) {
2054 done = gifconf_list[i](dev, NULL, 0);
2056 done = gifconf_list[i](dev, pos + total,
2066 * All done. Write the updated control block back to the caller.
2068 ifc.ifc_len = total;
2071 * Both BSD and Solaris return 0 here, so we do too.
2073 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2076 #ifdef CONFIG_PROC_FS
2078 * This is invoked by the /proc filesystem handler to display a device
2081 static struct net_device *dev_get_idx(loff_t pos)
2083 struct net_device *dev;
2086 for (i = 0, dev = dev_base; dev && i < pos; ++i, dev = dev->next);
2088 return i == pos ? dev : NULL;
2091 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2093 read_lock(&dev_base_lock);
2094 return *pos ? dev_get_idx(*pos - 1) : SEQ_START_TOKEN;
2097 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2100 return v == SEQ_START_TOKEN ? dev_base : ((struct net_device *)v)->next;
2103 void dev_seq_stop(struct seq_file *seq, void *v)
2105 read_unlock(&dev_base_lock);
2108 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2110 struct net_device_stats *stats = dev->get_stats(dev);
2113 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2114 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2115 dev->name, stats->rx_bytes, stats->rx_packets,
2117 stats->rx_dropped + stats->rx_missed_errors,
2118 stats->rx_fifo_errors,
2119 stats->rx_length_errors + stats->rx_over_errors +
2120 stats->rx_crc_errors + stats->rx_frame_errors,
2121 stats->rx_compressed, stats->multicast,
2122 stats->tx_bytes, stats->tx_packets,
2123 stats->tx_errors, stats->tx_dropped,
2124 stats->tx_fifo_errors, stats->collisions,
2125 stats->tx_carrier_errors +
2126 stats->tx_aborted_errors +
2127 stats->tx_window_errors +
2128 stats->tx_heartbeat_errors,
2129 stats->tx_compressed);
2131 seq_printf(seq, "%6s: No statistics available.\n", dev->name);
2135 * Called from the PROCfs module. This now uses the new arbitrary sized
2136 * /proc/net interface to create /proc/net/dev
2138 static int dev_seq_show(struct seq_file *seq, void *v)
2140 if (v == SEQ_START_TOKEN)
2141 seq_puts(seq, "Inter-| Receive "
2143 " face |bytes packets errs drop fifo frame "
2144 "compressed multicast|bytes packets errs "
2145 "drop fifo colls carrier compressed\n");
2147 dev_seq_printf_stats(seq, v);
2151 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2153 struct netif_rx_stats *rc = NULL;
2155 while (*pos < NR_CPUS)
2156 if (cpu_online(*pos)) {
2157 rc = &per_cpu(netdev_rx_stat, *pos);
2164 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2166 return softnet_get_online(pos);
2169 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2172 return softnet_get_online(pos);
2175 static void softnet_seq_stop(struct seq_file *seq, void *v)
2179 static int softnet_seq_show(struct seq_file *seq, void *v)
2181 struct netif_rx_stats *s = v;
2183 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2184 s->total, s->dropped, s->time_squeeze, 0,
2185 0, 0, 0, 0, /* was fastroute */
2190 static const struct seq_operations dev_seq_ops = {
2191 .start = dev_seq_start,
2192 .next = dev_seq_next,
2193 .stop = dev_seq_stop,
2194 .show = dev_seq_show,
2197 static int dev_seq_open(struct inode *inode, struct file *file)
2199 return seq_open(file, &dev_seq_ops);
2202 static const struct file_operations dev_seq_fops = {
2203 .owner = THIS_MODULE,
2204 .open = dev_seq_open,
2206 .llseek = seq_lseek,
2207 .release = seq_release,
2210 static const struct seq_operations softnet_seq_ops = {
2211 .start = softnet_seq_start,
2212 .next = softnet_seq_next,
2213 .stop = softnet_seq_stop,
2214 .show = softnet_seq_show,
2217 static int softnet_seq_open(struct inode *inode, struct file *file)
2219 return seq_open(file, &softnet_seq_ops);
2222 static const struct file_operations softnet_seq_fops = {
2223 .owner = THIS_MODULE,
2224 .open = softnet_seq_open,
2226 .llseek = seq_lseek,
2227 .release = seq_release,
2230 static void *ptype_get_idx(loff_t pos)
2232 struct packet_type *pt = NULL;
2236 list_for_each_entry_rcu(pt, &ptype_all, list) {
2242 for (t = 0; t < 16; t++) {
2243 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
2252 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
2255 return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
2258 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2260 struct packet_type *pt;
2261 struct list_head *nxt;
2265 if (v == SEQ_START_TOKEN)
2266 return ptype_get_idx(0);
2269 nxt = pt->list.next;
2270 if (pt->type == htons(ETH_P_ALL)) {
2271 if (nxt != &ptype_all)
2274 nxt = ptype_base[0].next;
2276 hash = ntohs(pt->type) & 15;
2278 while (nxt == &ptype_base[hash]) {
2281 nxt = ptype_base[hash].next;
2284 return list_entry(nxt, struct packet_type, list);
2287 static void ptype_seq_stop(struct seq_file *seq, void *v)
2292 static void ptype_seq_decode(struct seq_file *seq, void *sym)
2294 #ifdef CONFIG_KALLSYMS
2295 unsigned long offset = 0, symsize;
2296 const char *symname;
2300 symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset,
2307 modname = delim = "";
2308 seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim,
2314 seq_printf(seq, "[%p]", sym);
2317 static int ptype_seq_show(struct seq_file *seq, void *v)
2319 struct packet_type *pt = v;
2321 if (v == SEQ_START_TOKEN)
2322 seq_puts(seq, "Type Device Function\n");
2324 if (pt->type == htons(ETH_P_ALL))
2325 seq_puts(seq, "ALL ");
2327 seq_printf(seq, "%04x", ntohs(pt->type));
2329 seq_printf(seq, " %-8s ",
2330 pt->dev ? pt->dev->name : "");
2331 ptype_seq_decode(seq, pt->func);
2332 seq_putc(seq, '\n');
2338 static const struct seq_operations ptype_seq_ops = {
2339 .start = ptype_seq_start,
2340 .next = ptype_seq_next,
2341 .stop = ptype_seq_stop,
2342 .show = ptype_seq_show,
2345 static int ptype_seq_open(struct inode *inode, struct file *file)
2347 return seq_open(file, &ptype_seq_ops);
2350 static const struct file_operations ptype_seq_fops = {
2351 .owner = THIS_MODULE,
2352 .open = ptype_seq_open,
2354 .llseek = seq_lseek,
2355 .release = seq_release,
2359 #ifdef CONFIG_WIRELESS_EXT
2360 extern int wireless_proc_init(void);
2362 #define wireless_proc_init() 0
2365 static int __init dev_proc_init(void)
2369 if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops))
2371 if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops))
2373 if (!proc_net_fops_create("ptype", S_IRUGO, &ptype_seq_fops))
2376 if (wireless_proc_init())
2382 proc_net_remove("softnet_stat");
2384 proc_net_remove("ptype");
2386 proc_net_remove("dev");
2390 #define dev_proc_init() 0
2391 #endif /* CONFIG_PROC_FS */
2395 * netdev_set_master - set up master/slave pair
2396 * @slave: slave device
2397 * @master: new master device
2399 * Changes the master device of the slave. Pass %NULL to break the
2400 * bonding. The caller must hold the RTNL semaphore. On a failure
2401 * a negative errno code is returned. On success the reference counts
2402 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2403 * function returns zero.
2405 int netdev_set_master(struct net_device *slave, struct net_device *master)
2407 struct net_device *old = slave->master;
2417 slave->master = master;
2425 slave->flags |= IFF_SLAVE;
2427 slave->flags &= ~IFF_SLAVE;
2429 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2434 * dev_set_promiscuity - update promiscuity count on a device
2438 * Add or remove promiscuity from a device. While the count in the device
2439 * remains above zero the interface remains promiscuous. Once it hits zero
2440 * the device reverts back to normal filtering operation. A negative inc
2441 * value is used to drop promiscuity on the device.
2443 void dev_set_promiscuity(struct net_device *dev, int inc)
2445 unsigned short old_flags = dev->flags;
2447 if ((dev->promiscuity += inc) == 0)
2448 dev->flags &= ~IFF_PROMISC;
2450 dev->flags |= IFF_PROMISC;
2451 if (dev->flags != old_flags) {
2453 printk(KERN_INFO "device %s %s promiscuous mode\n",
2454 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2456 audit_log(current->audit_context, GFP_ATOMIC,
2457 AUDIT_ANOM_PROMISCUOUS,
2458 "dev=%s prom=%d old_prom=%d auid=%u",
2459 dev->name, (dev->flags & IFF_PROMISC),
2460 (old_flags & IFF_PROMISC),
2461 audit_get_loginuid(current->audit_context));
2466 * dev_set_allmulti - update allmulti count on a device
2470 * Add or remove reception of all multicast frames to a device. While the
2471 * count in the device remains above zero the interface remains listening
2472 * to all interfaces. Once it hits zero the device reverts back to normal
2473 * filtering operation. A negative @inc value is used to drop the counter
2474 * when releasing a resource needing all multicasts.
2477 void dev_set_allmulti(struct net_device *dev, int inc)
2479 unsigned short old_flags = dev->flags;
2481 dev->flags |= IFF_ALLMULTI;
2482 if ((dev->allmulti += inc) == 0)
2483 dev->flags &= ~IFF_ALLMULTI;
2484 if (dev->flags ^ old_flags)
2488 unsigned dev_get_flags(const struct net_device *dev)
2492 flags = (dev->flags & ~(IFF_PROMISC |
2497 (dev->gflags & (IFF_PROMISC |
2500 if (netif_running(dev)) {
2501 if (netif_oper_up(dev))
2502 flags |= IFF_RUNNING;
2503 if (netif_carrier_ok(dev))
2504 flags |= IFF_LOWER_UP;
2505 if (netif_dormant(dev))
2506 flags |= IFF_DORMANT;
2512 int dev_change_flags(struct net_device *dev, unsigned flags)
2515 int old_flags = dev->flags;
2518 * Set the flags on our device.
2521 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
2522 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
2524 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
2528 * Load in the correct multicast list now the flags have changed.
2534 * Have we downed the interface. We handle IFF_UP ourselves
2535 * according to user attempts to set it, rather than blindly
2540 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
2541 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
2547 if (dev->flags & IFF_UP &&
2548 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
2550 raw_notifier_call_chain(&netdev_chain,
2551 NETDEV_CHANGE, dev);
2553 if ((flags ^ dev->gflags) & IFF_PROMISC) {
2554 int inc = (flags & IFF_PROMISC) ? +1 : -1;
2555 dev->gflags ^= IFF_PROMISC;
2556 dev_set_promiscuity(dev, inc);
2559 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
2560 is important. Some (broken) drivers set IFF_PROMISC, when
2561 IFF_ALLMULTI is requested not asking us and not reporting.
2563 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
2564 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
2565 dev->gflags ^= IFF_ALLMULTI;
2566 dev_set_allmulti(dev, inc);
2569 if (old_flags ^ dev->flags)
2570 rtmsg_ifinfo(RTM_NEWLINK, dev, old_flags ^ dev->flags);
2575 int dev_set_mtu(struct net_device *dev, int new_mtu)
2579 if (new_mtu == dev->mtu)
2582 /* MTU must be positive. */
2586 if (!netif_device_present(dev))
2590 if (dev->change_mtu)
2591 err = dev->change_mtu(dev, new_mtu);
2594 if (!err && dev->flags & IFF_UP)
2595 raw_notifier_call_chain(&netdev_chain,
2596 NETDEV_CHANGEMTU, dev);
2600 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
2604 if (!dev->set_mac_address)
2606 if (sa->sa_family != dev->type)
2608 if (!netif_device_present(dev))
2610 err = dev->set_mac_address(dev, sa);
2612 raw_notifier_call_chain(&netdev_chain,
2613 NETDEV_CHANGEADDR, dev);
2618 * Perform the SIOCxIFxxx calls.
2620 static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
2623 struct net_device *dev = __dev_get_by_name(ifr->ifr_name);
2629 case SIOCGIFFLAGS: /* Get interface flags */
2630 ifr->ifr_flags = dev_get_flags(dev);
2633 case SIOCSIFFLAGS: /* Set interface flags */
2634 return dev_change_flags(dev, ifr->ifr_flags);
2636 case SIOCGIFMETRIC: /* Get the metric on the interface
2637 (currently unused) */
2638 ifr->ifr_metric = 0;
2641 case SIOCSIFMETRIC: /* Set the metric on the interface
2642 (currently unused) */
2645 case SIOCGIFMTU: /* Get the MTU of a device */
2646 ifr->ifr_mtu = dev->mtu;
2649 case SIOCSIFMTU: /* Set the MTU of a device */
2650 return dev_set_mtu(dev, ifr->ifr_mtu);
2654 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
2656 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
2657 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2658 ifr->ifr_hwaddr.sa_family = dev->type;
2662 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
2664 case SIOCSIFHWBROADCAST:
2665 if (ifr->ifr_hwaddr.sa_family != dev->type)
2667 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
2668 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2669 raw_notifier_call_chain(&netdev_chain,
2670 NETDEV_CHANGEADDR, dev);
2674 ifr->ifr_map.mem_start = dev->mem_start;
2675 ifr->ifr_map.mem_end = dev->mem_end;
2676 ifr->ifr_map.base_addr = dev->base_addr;
2677 ifr->ifr_map.irq = dev->irq;
2678 ifr->ifr_map.dma = dev->dma;
2679 ifr->ifr_map.port = dev->if_port;
2683 if (dev->set_config) {
2684 if (!netif_device_present(dev))
2686 return dev->set_config(dev, &ifr->ifr_map);
2691 if (!dev->set_multicast_list ||
2692 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2694 if (!netif_device_present(dev))
2696 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
2700 if (!dev->set_multicast_list ||
2701 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2703 if (!netif_device_present(dev))
2705 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
2709 ifr->ifr_ifindex = dev->ifindex;
2713 ifr->ifr_qlen = dev->tx_queue_len;
2717 if (ifr->ifr_qlen < 0)
2719 dev->tx_queue_len = ifr->ifr_qlen;
2723 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
2724 return dev_change_name(dev, ifr->ifr_newname);
2727 * Unknown or private ioctl
2731 if ((cmd >= SIOCDEVPRIVATE &&
2732 cmd <= SIOCDEVPRIVATE + 15) ||
2733 cmd == SIOCBONDENSLAVE ||
2734 cmd == SIOCBONDRELEASE ||
2735 cmd == SIOCBONDSETHWADDR ||
2736 cmd == SIOCBONDSLAVEINFOQUERY ||
2737 cmd == SIOCBONDINFOQUERY ||
2738 cmd == SIOCBONDCHANGEACTIVE ||
2739 cmd == SIOCGMIIPHY ||
2740 cmd == SIOCGMIIREG ||
2741 cmd == SIOCSMIIREG ||
2742 cmd == SIOCBRADDIF ||
2743 cmd == SIOCBRDELIF ||
2744 cmd == SIOCWANDEV) {
2746 if (dev->do_ioctl) {
2747 if (netif_device_present(dev))
2748 err = dev->do_ioctl(dev, ifr,
2761 * This function handles all "interface"-type I/O control requests. The actual
2762 * 'doing' part of this is dev_ifsioc above.
2766 * dev_ioctl - network device ioctl
2767 * @cmd: command to issue
2768 * @arg: pointer to a struct ifreq in user space
2770 * Issue ioctl functions to devices. This is normally called by the
2771 * user space syscall interfaces but can sometimes be useful for
2772 * other purposes. The return value is the return from the syscall if
2773 * positive or a negative errno code on error.
2776 int dev_ioctl(unsigned int cmd, void __user *arg)
2782 /* One special case: SIOCGIFCONF takes ifconf argument
2783 and requires shared lock, because it sleeps writing
2787 if (cmd == SIOCGIFCONF) {
2789 ret = dev_ifconf((char __user *) arg);
2793 if (cmd == SIOCGIFNAME)
2794 return dev_ifname((struct ifreq __user *)arg);
2796 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2799 ifr.ifr_name[IFNAMSIZ-1] = 0;
2801 colon = strchr(ifr.ifr_name, ':');
2806 * See which interface the caller is talking about.
2811 * These ioctl calls:
2812 * - can be done by all.
2813 * - atomic and do not require locking.
2824 dev_load(ifr.ifr_name);
2825 read_lock(&dev_base_lock);
2826 ret = dev_ifsioc(&ifr, cmd);
2827 read_unlock(&dev_base_lock);
2831 if (copy_to_user(arg, &ifr,
2832 sizeof(struct ifreq)))
2838 dev_load(ifr.ifr_name);
2840 ret = dev_ethtool(&ifr);
2845 if (copy_to_user(arg, &ifr,
2846 sizeof(struct ifreq)))
2852 * These ioctl calls:
2853 * - require superuser power.
2854 * - require strict serialization.
2860 if (!capable(CAP_NET_ADMIN))
2862 dev_load(ifr.ifr_name);
2864 ret = dev_ifsioc(&ifr, cmd);
2869 if (copy_to_user(arg, &ifr,
2870 sizeof(struct ifreq)))
2876 * These ioctl calls:
2877 * - require superuser power.
2878 * - require strict serialization.
2879 * - do not return a value
2889 case SIOCSIFHWBROADCAST:
2892 case SIOCBONDENSLAVE:
2893 case SIOCBONDRELEASE:
2894 case SIOCBONDSETHWADDR:
2895 case SIOCBONDCHANGEACTIVE:
2898 if (!capable(CAP_NET_ADMIN))
2901 case SIOCBONDSLAVEINFOQUERY:
2902 case SIOCBONDINFOQUERY:
2903 dev_load(ifr.ifr_name);
2905 ret = dev_ifsioc(&ifr, cmd);
2910 /* Get the per device memory space. We can add this but
2911 * currently do not support it */
2913 /* Set the per device memory buffer space.
2914 * Not applicable in our case */
2919 * Unknown or private ioctl.
2922 if (cmd == SIOCWANDEV ||
2923 (cmd >= SIOCDEVPRIVATE &&
2924 cmd <= SIOCDEVPRIVATE + 15)) {
2925 dev_load(ifr.ifr_name);
2927 ret = dev_ifsioc(&ifr, cmd);
2929 if (!ret && copy_to_user(arg, &ifr,
2930 sizeof(struct ifreq)))
2934 #ifdef CONFIG_WIRELESS_EXT
2935 /* Take care of Wireless Extensions */
2936 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
2937 /* If command is `set a parameter', or
2938 * `get the encoding parameters', check if
2939 * the user has the right to do it */
2940 if (IW_IS_SET(cmd) || cmd == SIOCGIWENCODE
2941 || cmd == SIOCGIWENCODEEXT) {
2942 if (!capable(CAP_NET_ADMIN))
2945 dev_load(ifr.ifr_name);
2947 /* Follow me in net/core/wireless.c */
2948 ret = wireless_process_ioctl(&ifr, cmd);
2950 if (IW_IS_GET(cmd) &&
2951 copy_to_user(arg, &ifr,
2952 sizeof(struct ifreq)))
2956 #endif /* CONFIG_WIRELESS_EXT */
2963 * dev_new_index - allocate an ifindex
2965 * Returns a suitable unique value for a new device interface
2966 * number. The caller must hold the rtnl semaphore or the
2967 * dev_base_lock to be sure it remains unique.
2969 static int dev_new_index(void)
2975 if (!__dev_get_by_index(ifindex))
2980 static int dev_boot_phase = 1;
2982 /* Delayed registration/unregisteration */
2983 static DEFINE_SPINLOCK(net_todo_list_lock);
2984 static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list);
2986 static void net_set_todo(struct net_device *dev)
2988 spin_lock(&net_todo_list_lock);
2989 list_add_tail(&dev->todo_list, &net_todo_list);
2990 spin_unlock(&net_todo_list_lock);
2994 * register_netdevice - register a network device
2995 * @dev: device to register
2997 * Take a completed network device structure and add it to the kernel
2998 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
2999 * chain. 0 is returned on success. A negative errno code is returned
3000 * on a failure to set up the device, or if the name is a duplicate.
3002 * Callers must hold the rtnl semaphore. You may want
3003 * register_netdev() instead of this.
3006 * The locking appears insufficient to guarantee two parallel registers
3007 * will not get the same name.
3010 int register_netdevice(struct net_device *dev)
3012 struct hlist_head *head;
3013 struct hlist_node *p;
3016 BUG_ON(dev_boot_phase);
3021 /* When net_device's are persistent, this will be fatal. */
3022 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
3024 spin_lock_init(&dev->queue_lock);
3025 spin_lock_init(&dev->_xmit_lock);
3026 dev->xmit_lock_owner = -1;
3027 #ifdef CONFIG_NET_CLS_ACT
3028 spin_lock_init(&dev->ingress_lock);
3033 /* Init, if this function is available */
3035 ret = dev->init(dev);
3043 if (!dev_valid_name(dev->name)) {
3048 dev->ifindex = dev_new_index();
3049 if (dev->iflink == -1)
3050 dev->iflink = dev->ifindex;
3052 /* Check for existence of name */
3053 head = dev_name_hash(dev->name);
3054 hlist_for_each(p, head) {
3055 struct net_device *d
3056 = hlist_entry(p, struct net_device, name_hlist);
3057 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
3063 /* Fix illegal SG+CSUM combinations. */
3064 if ((dev->features & NETIF_F_SG) &&
3065 !(dev->features & NETIF_F_ALL_CSUM)) {
3066 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
3068 dev->features &= ~NETIF_F_SG;
3071 /* TSO requires that SG is present as well. */
3072 if ((dev->features & NETIF_F_TSO) &&
3073 !(dev->features & NETIF_F_SG)) {
3074 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
3076 dev->features &= ~NETIF_F_TSO;
3078 if (dev->features & NETIF_F_UFO) {
3079 if (!(dev->features & NETIF_F_HW_CSUM)) {
3080 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3081 "NETIF_F_HW_CSUM feature.\n",
3083 dev->features &= ~NETIF_F_UFO;
3085 if (!(dev->features & NETIF_F_SG)) {
3086 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3087 "NETIF_F_SG feature.\n",
3089 dev->features &= ~NETIF_F_UFO;
3094 * nil rebuild_header routine,
3095 * that should be never called and used as just bug trap.
3098 if (!dev->rebuild_header)
3099 dev->rebuild_header = default_rebuild_header;
3101 ret = netdev_register_sysfs(dev);
3104 dev->reg_state = NETREG_REGISTERED;
3107 * Default initial state at registry is that the
3108 * device is present.
3111 set_bit(__LINK_STATE_PRESENT, &dev->state);
3114 dev_init_scheduler(dev);
3115 write_lock_bh(&dev_base_lock);
3117 dev_tail = &dev->next;
3118 hlist_add_head(&dev->name_hlist, head);
3119 hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex));
3121 write_unlock_bh(&dev_base_lock);
3123 /* Notify protocols, that a new device appeared. */
3124 raw_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
3133 * register_netdev - register a network device
3134 * @dev: device to register
3136 * Take a completed network device structure and add it to the kernel
3137 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3138 * chain. 0 is returned on success. A negative errno code is returned
3139 * on a failure to set up the device, or if the name is a duplicate.
3141 * This is a wrapper around register_netdev that takes the rtnl semaphore
3142 * and expands the device name if you passed a format string to
3145 int register_netdev(struct net_device *dev)
3152 * If the name is a format string the caller wants us to do a
3155 if (strchr(dev->name, '%')) {
3156 err = dev_alloc_name(dev, dev->name);
3161 err = register_netdevice(dev);
3166 EXPORT_SYMBOL(register_netdev);
3169 * netdev_wait_allrefs - wait until all references are gone.
3171 * This is called when unregistering network devices.
3173 * Any protocol or device that holds a reference should register
3174 * for netdevice notification, and cleanup and put back the
3175 * reference if they receive an UNREGISTER event.
3176 * We can get stuck here if buggy protocols don't correctly
3179 static void netdev_wait_allrefs(struct net_device *dev)
3181 unsigned long rebroadcast_time, warning_time;
3183 rebroadcast_time = warning_time = jiffies;
3184 while (atomic_read(&dev->refcnt) != 0) {
3185 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
3188 /* Rebroadcast unregister notification */
3189 raw_notifier_call_chain(&netdev_chain,
3190 NETDEV_UNREGISTER, dev);
3192 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
3194 /* We must not have linkwatch events
3195 * pending on unregister. If this
3196 * happens, we simply run the queue
3197 * unscheduled, resulting in a noop
3200 linkwatch_run_queue();
3205 rebroadcast_time = jiffies;
3210 if (time_after(jiffies, warning_time + 10 * HZ)) {
3211 printk(KERN_EMERG "unregister_netdevice: "
3212 "waiting for %s to become free. Usage "
3214 dev->name, atomic_read(&dev->refcnt));
3215 warning_time = jiffies;
3224 * register_netdevice(x1);
3225 * register_netdevice(x2);
3227 * unregister_netdevice(y1);
3228 * unregister_netdevice(y2);
3234 * We are invoked by rtnl_unlock() after it drops the semaphore.
3235 * This allows us to deal with problems:
3236 * 1) We can delete sysfs objects which invoke hotplug
3237 * without deadlocking with linkwatch via keventd.
3238 * 2) Since we run with the RTNL semaphore not held, we can sleep
3239 * safely in order to wait for the netdev refcnt to drop to zero.
3241 static DEFINE_MUTEX(net_todo_run_mutex);
3242 void netdev_run_todo(void)
3244 struct list_head list;
3246 /* Need to guard against multiple cpu's getting out of order. */
3247 mutex_lock(&net_todo_run_mutex);
3249 /* Not safe to do outside the semaphore. We must not return
3250 * until all unregister events invoked by the local processor
3251 * have been completed (either by this todo run, or one on
3254 if (list_empty(&net_todo_list))
3257 /* Snapshot list, allow later requests */
3258 spin_lock(&net_todo_list_lock);
3259 list_replace_init(&net_todo_list, &list);
3260 spin_unlock(&net_todo_list_lock);
3262 while (!list_empty(&list)) {
3263 struct net_device *dev
3264 = list_entry(list.next, struct net_device, todo_list);
3265 list_del(&dev->todo_list);
3267 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
3268 printk(KERN_ERR "network todo '%s' but state %d\n",
3269 dev->name, dev->reg_state);
3274 netdev_unregister_sysfs(dev);
3275 dev->reg_state = NETREG_UNREGISTERED;
3277 netdev_wait_allrefs(dev);
3280 BUG_ON(atomic_read(&dev->refcnt));
3281 BUG_TRAP(!dev->ip_ptr);
3282 BUG_TRAP(!dev->ip6_ptr);
3283 BUG_TRAP(!dev->dn_ptr);
3285 /* It must be the very last action,
3286 * after this 'dev' may point to freed up memory.
3288 if (dev->destructor)
3289 dev->destructor(dev);
3293 mutex_unlock(&net_todo_run_mutex);
3296 static struct net_device_stats *maybe_internal_stats(struct net_device *dev)
3298 if (dev->features & NETIF_F_INTERNAL_STATS)
3304 * alloc_netdev - allocate network device
3305 * @sizeof_priv: size of private data to allocate space for
3306 * @name: device name format string
3307 * @setup: callback to initialize device
3309 * Allocates a struct net_device with private data area for driver use
3310 * and performs basic initialization.
3312 struct net_device *alloc_netdev(int sizeof_priv, const char *name,
3313 void (*setup)(struct net_device *))
3316 struct net_device *dev;
3319 BUG_ON(strlen(name) >= sizeof(dev->name));
3321 /* ensure 32-byte alignment of both the device and private area */
3322 alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
3323 alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
3325 p = kzalloc(alloc_size, GFP_KERNEL);
3327 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
3331 dev = (struct net_device *)
3332 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
3333 dev->padded = (char *)dev - (char *)p;
3336 dev->priv = netdev_priv(dev);
3338 dev->get_stats = maybe_internal_stats;
3340 strcpy(dev->name, name);
3343 EXPORT_SYMBOL(alloc_netdev);
3346 * free_netdev - free network device
3349 * This function does the last stage of destroying an allocated device
3350 * interface. The reference to the device object is released.
3351 * If this is the last reference then it will be freed.
3353 void free_netdev(struct net_device *dev)
3356 /* Compatibility with error handling in drivers */
3357 if (dev->reg_state == NETREG_UNINITIALIZED) {
3358 kfree((char *)dev - dev->padded);
3362 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
3363 dev->reg_state = NETREG_RELEASED;
3365 /* will free via device release */
3366 put_device(&dev->dev);
3368 kfree((char *)dev - dev->padded);
3372 /* Synchronize with packet receive processing. */
3373 void synchronize_net(void)
3380 * unregister_netdevice - remove device from the kernel
3383 * This function shuts down a device interface and removes it
3384 * from the kernel tables. On success 0 is returned, on a failure
3385 * a negative errno code is returned.
3387 * Callers must hold the rtnl semaphore. You may want
3388 * unregister_netdev() instead of this.
3391 void unregister_netdevice(struct net_device *dev)
3393 struct net_device *d, **dp;
3395 BUG_ON(dev_boot_phase);
3398 /* Some devices call without registering for initialization unwind. */
3399 if (dev->reg_state == NETREG_UNINITIALIZED) {
3400 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3401 "was registered\n", dev->name, dev);
3407 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3409 /* If device is running, close it first. */
3410 if (dev->flags & IFF_UP)
3413 /* And unlink it from device chain. */
3414 for (dp = &dev_base; (d = *dp) != NULL; dp = &d->next) {
3416 write_lock_bh(&dev_base_lock);
3417 hlist_del(&dev->name_hlist);
3418 hlist_del(&dev->index_hlist);
3419 if (dev_tail == &dev->next)
3422 write_unlock_bh(&dev_base_lock);
3428 dev->reg_state = NETREG_UNREGISTERING;
3432 /* Shutdown queueing discipline. */
3436 /* Notify protocols, that we are about to destroy
3437 this device. They should clean all the things.
3439 raw_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
3442 * Flush the multicast chain
3444 dev_mc_discard(dev);
3449 /* Notifier chain MUST detach us from master device. */
3450 BUG_TRAP(!dev->master);
3452 /* Finish processing unregister after unlock */
3461 * unregister_netdev - remove device from the kernel
3464 * This function shuts down a device interface and removes it
3465 * from the kernel tables. On success 0 is returned, on a failure
3466 * a negative errno code is returned.
3468 * This is just a wrapper for unregister_netdevice that takes
3469 * the rtnl semaphore. In general you want to use this and not
3470 * unregister_netdevice.
3472 void unregister_netdev(struct net_device *dev)
3475 unregister_netdevice(dev);
3479 EXPORT_SYMBOL(unregister_netdev);
3481 static int dev_cpu_callback(struct notifier_block *nfb,
3482 unsigned long action,
3485 struct sk_buff **list_skb;
3486 struct net_device **list_net;
3487 struct sk_buff *skb;
3488 unsigned int cpu, oldcpu = (unsigned long)ocpu;
3489 struct softnet_data *sd, *oldsd;
3491 if (action != CPU_DEAD)
3494 local_irq_disable();
3495 cpu = smp_processor_id();
3496 sd = &per_cpu(softnet_data, cpu);
3497 oldsd = &per_cpu(softnet_data, oldcpu);
3499 /* Find end of our completion_queue. */
3500 list_skb = &sd->completion_queue;
3502 list_skb = &(*list_skb)->next;
3503 /* Append completion queue from offline CPU. */
3504 *list_skb = oldsd->completion_queue;
3505 oldsd->completion_queue = NULL;
3507 /* Find end of our output_queue. */
3508 list_net = &sd->output_queue;
3510 list_net = &(*list_net)->next_sched;
3511 /* Append output queue from offline CPU. */
3512 *list_net = oldsd->output_queue;
3513 oldsd->output_queue = NULL;
3515 raise_softirq_irqoff(NET_TX_SOFTIRQ);
3518 /* Process offline CPU's input_pkt_queue */
3519 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
3525 #ifdef CONFIG_NET_DMA
3527 * net_dma_rebalance -
3528 * This is called when the number of channels allocated to the net_dma_client
3529 * changes. The net_dma_client tries to have one DMA channel per CPU.
3531 static void net_dma_rebalance(void)
3533 unsigned int cpu, i, n;
3534 struct dma_chan *chan;
3536 if (net_dma_count == 0) {
3537 for_each_online_cpu(cpu)
3538 rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
3543 cpu = first_cpu(cpu_online_map);
3546 list_for_each_entry(chan, &net_dma_client->channels, client_node) {
3547 n = ((num_online_cpus() / net_dma_count)
3548 + (i < (num_online_cpus() % net_dma_count) ? 1 : 0));
3551 per_cpu(softnet_data, cpu).net_dma = chan;
3552 cpu = next_cpu(cpu, cpu_online_map);
3561 * netdev_dma_event - event callback for the net_dma_client
3562 * @client: should always be net_dma_client
3563 * @chan: DMA channel for the event
3564 * @event: event type
3566 static void netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
3567 enum dma_event event)
3569 spin_lock(&net_dma_event_lock);
3571 case DMA_RESOURCE_ADDED:
3573 net_dma_rebalance();
3575 case DMA_RESOURCE_REMOVED:
3577 net_dma_rebalance();
3582 spin_unlock(&net_dma_event_lock);
3586 * netdev_dma_regiser - register the networking subsystem as a DMA client
3588 static int __init netdev_dma_register(void)
3590 spin_lock_init(&net_dma_event_lock);
3591 net_dma_client = dma_async_client_register(netdev_dma_event);
3592 if (net_dma_client == NULL)
3595 dma_async_client_chan_request(net_dma_client, num_online_cpus());
3600 static int __init netdev_dma_register(void) { return -ENODEV; }
3601 #endif /* CONFIG_NET_DMA */
3604 * Initialize the DEV module. At boot time this walks the device list and
3605 * unhooks any devices that fail to initialise (normally hardware not
3606 * present) and leaves us with a valid list of present and active devices.
3611 * This is called single threaded during boot, so no need
3612 * to take the rtnl semaphore.
3614 static int __init net_dev_init(void)
3616 int i, rc = -ENOMEM;
3618 BUG_ON(!dev_boot_phase);
3620 if (dev_proc_init())
3623 if (netdev_sysfs_init())
3626 INIT_LIST_HEAD(&ptype_all);
3627 for (i = 0; i < 16; i++)
3628 INIT_LIST_HEAD(&ptype_base[i]);
3630 for (i = 0; i < ARRAY_SIZE(dev_name_head); i++)
3631 INIT_HLIST_HEAD(&dev_name_head[i]);
3633 for (i = 0; i < ARRAY_SIZE(dev_index_head); i++)
3634 INIT_HLIST_HEAD(&dev_index_head[i]);
3637 * Initialise the packet receive queues.
3640 for_each_possible_cpu(i) {
3641 struct softnet_data *queue;
3643 queue = &per_cpu(softnet_data, i);
3644 skb_queue_head_init(&queue->input_pkt_queue);
3645 queue->completion_queue = NULL;
3646 INIT_LIST_HEAD(&queue->poll_list);
3647 set_bit(__LINK_STATE_START, &queue->backlog_dev.state);
3648 queue->backlog_dev.weight = weight_p;
3649 queue->backlog_dev.poll = process_backlog;
3650 atomic_set(&queue->backlog_dev.refcnt, 1);
3653 netdev_dma_register();
3657 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
3658 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
3660 hotcpu_notifier(dev_cpu_callback, 0);
3668 subsys_initcall(net_dev_init);
3670 EXPORT_SYMBOL(__dev_get_by_index);
3671 EXPORT_SYMBOL(__dev_get_by_name);
3672 EXPORT_SYMBOL(__dev_remove_pack);
3673 EXPORT_SYMBOL(dev_valid_name);
3674 EXPORT_SYMBOL(dev_add_pack);
3675 EXPORT_SYMBOL(dev_alloc_name);
3676 EXPORT_SYMBOL(dev_close);
3677 EXPORT_SYMBOL(dev_get_by_flags);
3678 EXPORT_SYMBOL(dev_get_by_index);
3679 EXPORT_SYMBOL(dev_get_by_name);
3680 EXPORT_SYMBOL(dev_open);
3681 EXPORT_SYMBOL(dev_queue_xmit);
3682 EXPORT_SYMBOL(dev_remove_pack);
3683 EXPORT_SYMBOL(dev_set_allmulti);
3684 EXPORT_SYMBOL(dev_set_promiscuity);
3685 EXPORT_SYMBOL(dev_change_flags);
3686 EXPORT_SYMBOL(dev_set_mtu);
3687 EXPORT_SYMBOL(dev_set_mac_address);
3688 EXPORT_SYMBOL(free_netdev);
3689 EXPORT_SYMBOL(netdev_boot_setup_check);
3690 EXPORT_SYMBOL(netdev_set_master);
3691 EXPORT_SYMBOL(netdev_state_change);
3692 EXPORT_SYMBOL(netif_receive_skb);
3693 EXPORT_SYMBOL(netif_rx);
3694 EXPORT_SYMBOL(register_gifconf);
3695 EXPORT_SYMBOL(register_netdevice);
3696 EXPORT_SYMBOL(register_netdevice_notifier);
3697 EXPORT_SYMBOL(skb_checksum_help);
3698 EXPORT_SYMBOL(synchronize_net);
3699 EXPORT_SYMBOL(unregister_netdevice);
3700 EXPORT_SYMBOL(unregister_netdevice_notifier);
3701 EXPORT_SYMBOL(net_enable_timestamp);
3702 EXPORT_SYMBOL(net_disable_timestamp);
3703 EXPORT_SYMBOL(dev_get_flags);
3705 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
3706 EXPORT_SYMBOL(br_handle_frame_hook);
3707 EXPORT_SYMBOL(br_fdb_get_hook);
3708 EXPORT_SYMBOL(br_fdb_put_hook);
3712 EXPORT_SYMBOL(dev_load);
3715 EXPORT_PER_CPU_SYMBOL(softnet_data);