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/config.h>
80 #include <linux/cpu.h>
81 #include <linux/types.h>
82 #include <linux/kernel.h>
83 #include <linux/sched.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>
101 #include <linux/divert.h>
103 #include <net/pkt_sched.h>
104 #include <net/checksum.h>
105 #include <linux/highmem.h>
106 #include <linux/init.h>
107 #include <linux/kmod.h>
108 #include <linux/module.h>
109 #include <linux/kallsyms.h>
110 #include <linux/netpoll.h>
111 #include <linux/rcupdate.h>
112 #include <linux/delay.h>
113 #include <linux/wireless.h>
114 #include <net/iw_handler.h>
115 #include <asm/current.h>
118 * The list of packet types we will receive (as opposed to discard)
119 * and the routines to invoke.
121 * Why 16. Because with 16 the only overlap we get on a hash of the
122 * low nibble of the protocol value is RARP/SNAP/X.25.
124 * NOTE: That is no longer true with the addition of VLAN tags. Not
125 * sure which should go first, but I bet it won't make much
126 * difference if we are running VLANs. The good news is that
127 * this protocol won't be in the list unless compiled in, so
128 * the average user (w/out VLANs) will not be adversly affected.
145 static DEFINE_SPINLOCK(ptype_lock);
146 static struct list_head ptype_base[16]; /* 16 way hashed list */
147 static struct list_head ptype_all; /* Taps */
150 * The @dev_base list is protected by @dev_base_lock and the rtln
153 * Pure readers hold dev_base_lock for reading.
155 * Writers must hold the rtnl semaphore while they loop through the
156 * dev_base list, and hold dev_base_lock for writing when they do the
157 * actual updates. This allows pure readers to access the list even
158 * while a writer is preparing to update it.
160 * To put it another way, dev_base_lock is held for writing only to
161 * protect against pure readers; the rtnl semaphore provides the
162 * protection against other writers.
164 * See, for example usages, register_netdevice() and
165 * unregister_netdevice(), which must be called with the rtnl
168 struct net_device *dev_base;
169 static struct net_device **dev_tail = &dev_base;
170 DEFINE_RWLOCK(dev_base_lock);
172 EXPORT_SYMBOL(dev_base);
173 EXPORT_SYMBOL(dev_base_lock);
175 #define NETDEV_HASHBITS 8
176 static struct hlist_head dev_name_head[1<<NETDEV_HASHBITS];
177 static struct hlist_head dev_index_head[1<<NETDEV_HASHBITS];
179 static inline struct hlist_head *dev_name_hash(const char *name)
181 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
182 return &dev_name_head[hash & ((1<<NETDEV_HASHBITS)-1)];
185 static inline struct hlist_head *dev_index_hash(int ifindex)
187 return &dev_index_head[ifindex & ((1<<NETDEV_HASHBITS)-1)];
194 static struct notifier_block *netdev_chain;
197 * Device drivers call our routines to queue packets here. We empty the
198 * queue in the local softnet handler.
200 DEFINE_PER_CPU(struct softnet_data, softnet_data) = { NULL };
203 extern int netdev_sysfs_init(void);
204 extern int netdev_register_sysfs(struct net_device *);
205 extern void netdev_unregister_sysfs(struct net_device *);
207 #define netdev_sysfs_init() (0)
208 #define netdev_register_sysfs(dev) (0)
209 #define netdev_unregister_sysfs(dev) do { } while(0)
213 /*******************************************************************************
215 Protocol management and registration routines
217 *******************************************************************************/
226 * Add a protocol ID to the list. Now that the input handler is
227 * smarter we can dispense with all the messy stuff that used to be
230 * BEWARE!!! Protocol handlers, mangling input packets,
231 * MUST BE last in hash buckets and checking protocol handlers
232 * MUST start from promiscuous ptype_all chain in net_bh.
233 * It is true now, do not change it.
234 * Explanation follows: if protocol handler, mangling packet, will
235 * be the first on list, it is not able to sense, that packet
236 * is cloned and should be copied-on-write, so that it will
237 * change it and subsequent readers will get broken packet.
242 * dev_add_pack - add packet handler
243 * @pt: packet type declaration
245 * Add a protocol handler to the networking stack. The passed &packet_type
246 * is linked into kernel lists and may not be freed until it has been
247 * removed from the kernel lists.
249 * This call does not sleep therefore it can not
250 * guarantee all CPU's that are in middle of receiving packets
251 * will see the new packet type (until the next received packet).
254 void dev_add_pack(struct packet_type *pt)
258 spin_lock_bh(&ptype_lock);
259 if (pt->type == htons(ETH_P_ALL)) {
261 list_add_rcu(&pt->list, &ptype_all);
263 hash = ntohs(pt->type) & 15;
264 list_add_rcu(&pt->list, &ptype_base[hash]);
266 spin_unlock_bh(&ptype_lock);
270 * __dev_remove_pack - remove packet handler
271 * @pt: packet type declaration
273 * Remove a protocol handler that was previously added to the kernel
274 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
275 * from the kernel lists and can be freed or reused once this function
278 * The packet type might still be in use by receivers
279 * and must not be freed until after all the CPU's have gone
280 * through a quiescent state.
282 void __dev_remove_pack(struct packet_type *pt)
284 struct list_head *head;
285 struct packet_type *pt1;
287 spin_lock_bh(&ptype_lock);
289 if (pt->type == htons(ETH_P_ALL)) {
293 head = &ptype_base[ntohs(pt->type) & 15];
295 list_for_each_entry(pt1, head, list) {
297 list_del_rcu(&pt->list);
302 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
304 spin_unlock_bh(&ptype_lock);
307 * dev_remove_pack - remove packet handler
308 * @pt: packet type declaration
310 * Remove a protocol handler that was previously added to the kernel
311 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
312 * from the kernel lists and can be freed or reused once this function
315 * This call sleeps to guarantee that no CPU is looking at the packet
318 void dev_remove_pack(struct packet_type *pt)
320 __dev_remove_pack(pt);
325 /******************************************************************************
327 Device Boot-time Settings Routines
329 *******************************************************************************/
331 /* Boot time configuration table */
332 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
335 * netdev_boot_setup_add - add new setup entry
336 * @name: name of the device
337 * @map: configured settings for the device
339 * Adds new setup entry to the dev_boot_setup list. The function
340 * returns 0 on error and 1 on success. This is a generic routine to
343 static int netdev_boot_setup_add(char *name, struct ifmap *map)
345 struct netdev_boot_setup *s;
349 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
350 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
351 memset(s[i].name, 0, sizeof(s[i].name));
352 strcpy(s[i].name, name);
353 memcpy(&s[i].map, map, sizeof(s[i].map));
358 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
362 * netdev_boot_setup_check - check boot time settings
363 * @dev: the netdevice
365 * Check boot time settings for the device.
366 * The found settings are set for the device to be used
367 * later in the device probing.
368 * Returns 0 if no settings found, 1 if they are.
370 int netdev_boot_setup_check(struct net_device *dev)
372 struct netdev_boot_setup *s = dev_boot_setup;
375 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
376 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
377 !strncmp(dev->name, s[i].name, strlen(s[i].name))) {
378 dev->irq = s[i].map.irq;
379 dev->base_addr = s[i].map.base_addr;
380 dev->mem_start = s[i].map.mem_start;
381 dev->mem_end = s[i].map.mem_end;
390 * netdev_boot_base - get address from boot time settings
391 * @prefix: prefix for network device
392 * @unit: id for network device
394 * Check boot time settings for the base address of device.
395 * The found settings are set for the device to be used
396 * later in the device probing.
397 * Returns 0 if no settings found.
399 unsigned long netdev_boot_base(const char *prefix, int unit)
401 const struct netdev_boot_setup *s = dev_boot_setup;
405 sprintf(name, "%s%d", prefix, unit);
408 * If device already registered then return base of 1
409 * to indicate not to probe for this interface
411 if (__dev_get_by_name(name))
414 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
415 if (!strcmp(name, s[i].name))
416 return s[i].map.base_addr;
421 * Saves at boot time configured settings for any netdevice.
423 int __init netdev_boot_setup(char *str)
428 str = get_options(str, ARRAY_SIZE(ints), ints);
433 memset(&map, 0, sizeof(map));
437 map.base_addr = ints[2];
439 map.mem_start = ints[3];
441 map.mem_end = ints[4];
443 /* Add new entry to the list */
444 return netdev_boot_setup_add(str, &map);
447 __setup("netdev=", netdev_boot_setup);
449 /*******************************************************************************
451 Device Interface Subroutines
453 *******************************************************************************/
456 * __dev_get_by_name - find a device by its name
457 * @name: name to find
459 * Find an interface by name. Must be called under RTNL semaphore
460 * or @dev_base_lock. If the name is found a pointer to the device
461 * is returned. If the name is not found then %NULL is returned. The
462 * reference counters are not incremented so the caller must be
463 * careful with locks.
466 struct net_device *__dev_get_by_name(const char *name)
468 struct hlist_node *p;
470 hlist_for_each(p, dev_name_hash(name)) {
471 struct net_device *dev
472 = hlist_entry(p, struct net_device, name_hlist);
473 if (!strncmp(dev->name, name, IFNAMSIZ))
480 * dev_get_by_name - find a device by its name
481 * @name: name to find
483 * Find an interface by name. This can be called from any
484 * context and does its own locking. The returned handle has
485 * the usage count incremented and the caller must use dev_put() to
486 * release it when it is no longer needed. %NULL is returned if no
487 * matching device is found.
490 struct net_device *dev_get_by_name(const char *name)
492 struct net_device *dev;
494 read_lock(&dev_base_lock);
495 dev = __dev_get_by_name(name);
498 read_unlock(&dev_base_lock);
503 * __dev_get_by_index - find a device by its ifindex
504 * @ifindex: index of device
506 * Search for an interface by index. Returns %NULL if the device
507 * is not found or a pointer to the device. The device has not
508 * had its reference counter increased so the caller must be careful
509 * about locking. The caller must hold either the RTNL semaphore
513 struct net_device *__dev_get_by_index(int ifindex)
515 struct hlist_node *p;
517 hlist_for_each(p, dev_index_hash(ifindex)) {
518 struct net_device *dev
519 = hlist_entry(p, struct net_device, index_hlist);
520 if (dev->ifindex == ifindex)
528 * dev_get_by_index - find a device by its ifindex
529 * @ifindex: index of device
531 * Search for an interface by index. Returns NULL if the device
532 * is not found or a pointer to the device. The device returned has
533 * had a reference added and the pointer is safe until the user calls
534 * dev_put to indicate they have finished with it.
537 struct net_device *dev_get_by_index(int ifindex)
539 struct net_device *dev;
541 read_lock(&dev_base_lock);
542 dev = __dev_get_by_index(ifindex);
545 read_unlock(&dev_base_lock);
550 * dev_getbyhwaddr - find a device by its hardware address
551 * @type: media type of device
552 * @ha: hardware address
554 * Search for an interface by MAC address. Returns NULL if the device
555 * is not found or a pointer to the device. The caller must hold the
556 * rtnl semaphore. The returned device has not had its ref count increased
557 * and the caller must therefore be careful about locking
560 * If the API was consistent this would be __dev_get_by_hwaddr
563 struct net_device *dev_getbyhwaddr(unsigned short type, char *ha)
565 struct net_device *dev;
569 for (dev = dev_base; dev; dev = dev->next)
570 if (dev->type == type &&
571 !memcmp(dev->dev_addr, ha, dev->addr_len))
576 EXPORT_SYMBOL(dev_getbyhwaddr);
578 struct net_device *dev_getfirstbyhwtype(unsigned short type)
580 struct net_device *dev;
583 for (dev = dev_base; dev; dev = dev->next) {
584 if (dev->type == type) {
593 EXPORT_SYMBOL(dev_getfirstbyhwtype);
596 * dev_get_by_flags - find any device with given flags
597 * @if_flags: IFF_* values
598 * @mask: bitmask of bits in if_flags to check
600 * Search for any interface with the given flags. Returns NULL if a device
601 * is not found or a pointer to the device. The device returned has
602 * had a reference added and the pointer is safe until the user calls
603 * dev_put to indicate they have finished with it.
606 struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mask)
608 struct net_device *dev;
610 read_lock(&dev_base_lock);
611 for (dev = dev_base; dev != NULL; dev = dev->next) {
612 if (((dev->flags ^ if_flags) & mask) == 0) {
617 read_unlock(&dev_base_lock);
622 * dev_valid_name - check if name is okay for network device
625 * Network device names need to be valid file names to
626 * to allow sysfs to work
628 int dev_valid_name(const char *name)
630 return !(*name == '\0'
631 || !strcmp(name, ".")
632 || !strcmp(name, "..")
633 || strchr(name, '/'));
637 * dev_alloc_name - allocate a name for a device
639 * @name: name format string
641 * Passed a format string - eg "lt%d" it will try and find a suitable
642 * id. Not efficient for many devices, not called a lot. The caller
643 * must hold the dev_base or rtnl lock while allocating the name and
644 * adding the device in order to avoid duplicates. Returns the number
645 * of the unit assigned or a negative errno code.
648 int dev_alloc_name(struct net_device *dev, const char *name)
653 const int max_netdevices = 8*PAGE_SIZE;
655 struct net_device *d;
657 p = strnchr(name, IFNAMSIZ-1, '%');
660 * Verify the string as this thing may have come from
661 * the user. There must be either one "%d" and no other "%"
664 if (p[1] != 'd' || strchr(p + 2, '%'))
667 /* Use one page as a bit array of possible slots */
668 inuse = (long *) get_zeroed_page(GFP_ATOMIC);
672 for (d = dev_base; d; d = d->next) {
673 if (!sscanf(d->name, name, &i))
675 if (i < 0 || i >= max_netdevices)
678 /* avoid cases where sscanf is not exact inverse of printf */
679 snprintf(buf, sizeof(buf), name, i);
680 if (!strncmp(buf, d->name, IFNAMSIZ))
684 i = find_first_zero_bit(inuse, max_netdevices);
685 free_page((unsigned long) inuse);
688 snprintf(buf, sizeof(buf), name, i);
689 if (!__dev_get_by_name(buf)) {
690 strlcpy(dev->name, buf, IFNAMSIZ);
694 /* It is possible to run out of possible slots
695 * when the name is long and there isn't enough space left
696 * for the digits, or if all bits are used.
703 * dev_change_name - change name of a device
705 * @newname: name (or format string) must be at least IFNAMSIZ
707 * Change name of a device, can pass format strings "eth%d".
710 int dev_change_name(struct net_device *dev, char *newname)
716 if (dev->flags & IFF_UP)
719 if (!dev_valid_name(newname))
722 if (strchr(newname, '%')) {
723 err = dev_alloc_name(dev, newname);
726 strcpy(newname, dev->name);
728 else if (__dev_get_by_name(newname))
731 strlcpy(dev->name, newname, IFNAMSIZ);
733 err = class_device_rename(&dev->class_dev, dev->name);
735 hlist_del(&dev->name_hlist);
736 hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name));
737 notifier_call_chain(&netdev_chain, NETDEV_CHANGENAME, dev);
744 * netdev_features_change - device changes fatures
745 * @dev: device to cause notification
747 * Called to indicate a device has changed features.
749 void netdev_features_change(struct net_device *dev)
751 notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
753 EXPORT_SYMBOL(netdev_features_change);
756 * netdev_state_change - device changes state
757 * @dev: device to cause notification
759 * Called to indicate a device has changed state. This function calls
760 * the notifier chains for netdev_chain and sends a NEWLINK message
761 * to the routing socket.
763 void netdev_state_change(struct net_device *dev)
765 if (dev->flags & IFF_UP) {
766 notifier_call_chain(&netdev_chain, NETDEV_CHANGE, dev);
767 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
772 * dev_load - load a network module
773 * @name: name of interface
775 * If a network interface is not present and the process has suitable
776 * privileges this function loads the module. If module loading is not
777 * available in this kernel then it becomes a nop.
780 void dev_load(const char *name)
782 struct net_device *dev;
784 read_lock(&dev_base_lock);
785 dev = __dev_get_by_name(name);
786 read_unlock(&dev_base_lock);
788 if (!dev && capable(CAP_SYS_MODULE))
789 request_module("%s", name);
792 static int default_rebuild_header(struct sk_buff *skb)
794 printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
795 skb->dev ? skb->dev->name : "NULL!!!");
802 * dev_open - prepare an interface for use.
803 * @dev: device to open
805 * Takes a device from down to up state. The device's private open
806 * function is invoked and then the multicast lists are loaded. Finally
807 * the device is moved into the up state and a %NETDEV_UP message is
808 * sent to the netdev notifier chain.
810 * Calling this function on an active interface is a nop. On a failure
811 * a negative errno code is returned.
813 int dev_open(struct net_device *dev)
821 if (dev->flags & IFF_UP)
825 * Is it even present?
827 if (!netif_device_present(dev))
831 * Call device private open method
833 set_bit(__LINK_STATE_START, &dev->state);
835 ret = dev->open(dev);
837 clear_bit(__LINK_STATE_START, &dev->state);
841 * If it went open OK then:
848 dev->flags |= IFF_UP;
851 * Initialize multicasting status
856 * Wakeup transmit queue engine
861 * ... and announce new interface.
863 notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
869 * dev_close - shutdown an interface.
870 * @dev: device to shutdown
872 * This function moves an active device into down state. A
873 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
874 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
877 int dev_close(struct net_device *dev)
879 if (!(dev->flags & IFF_UP))
883 * Tell people we are going down, so that they can
884 * prepare to death, when device is still operating.
886 notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
890 clear_bit(__LINK_STATE_START, &dev->state);
892 /* Synchronize to scheduled poll. We cannot touch poll list,
893 * it can be even on different cpu. So just clear netif_running(),
894 * and wait when poll really will happen. Actually, the best place
895 * for this is inside dev->stop() after device stopped its irq
896 * engine, but this requires more changes in devices. */
898 smp_mb__after_clear_bit(); /* Commit netif_running(). */
899 while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
905 * Call the device specific close. This cannot fail.
906 * Only if device is UP
908 * We allow it to be called even after a DETACH hot-plug
915 * Device is now down.
918 dev->flags &= ~IFF_UP;
921 * Tell people we are down
923 notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
930 * Device change register/unregister. These are not inline or static
931 * as we export them to the world.
935 * register_netdevice_notifier - register a network notifier block
938 * Register a notifier to be called when network device events occur.
939 * The notifier passed is linked into the kernel structures and must
940 * not be reused until it has been unregistered. A negative errno code
941 * is returned on a failure.
943 * When registered all registration and up events are replayed
944 * to the new notifier to allow device to have a race free
945 * view of the network device list.
948 int register_netdevice_notifier(struct notifier_block *nb)
950 struct net_device *dev;
954 err = notifier_chain_register(&netdev_chain, nb);
956 for (dev = dev_base; dev; dev = dev->next) {
957 nb->notifier_call(nb, NETDEV_REGISTER, dev);
959 if (dev->flags & IFF_UP)
960 nb->notifier_call(nb, NETDEV_UP, dev);
968 * unregister_netdevice_notifier - unregister a network notifier block
971 * Unregister a notifier previously registered by
972 * register_netdevice_notifier(). The notifier is unlinked into the
973 * kernel structures and may then be reused. A negative errno code
974 * is returned on a failure.
977 int unregister_netdevice_notifier(struct notifier_block *nb)
979 return notifier_chain_unregister(&netdev_chain, nb);
983 * call_netdevice_notifiers - call all network notifier blocks
984 * @val: value passed unmodified to notifier function
985 * @v: pointer passed unmodified to notifier function
987 * Call all network notifier blocks. Parameters and return value
988 * are as for notifier_call_chain().
991 int call_netdevice_notifiers(unsigned long val, void *v)
993 return notifier_call_chain(&netdev_chain, val, v);
996 /* When > 0 there are consumers of rx skb time stamps */
997 static atomic_t netstamp_needed = ATOMIC_INIT(0);
999 void net_enable_timestamp(void)
1001 atomic_inc(&netstamp_needed);
1004 void net_disable_timestamp(void)
1006 atomic_dec(&netstamp_needed);
1009 void __net_timestamp(struct sk_buff *skb)
1013 do_gettimeofday(&tv);
1014 skb_set_timestamp(skb, &tv);
1016 EXPORT_SYMBOL(__net_timestamp);
1018 static inline void net_timestamp(struct sk_buff *skb)
1020 if (atomic_read(&netstamp_needed))
1021 __net_timestamp(skb);
1023 skb->tstamp.off_sec = 0;
1024 skb->tstamp.off_usec = 0;
1029 * Support routine. Sends outgoing frames to any network
1030 * taps currently in use.
1033 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1035 struct packet_type *ptype;
1040 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1041 /* Never send packets back to the socket
1042 * they originated from - MvS (miquels@drinkel.ow.org)
1044 if ((ptype->dev == dev || !ptype->dev) &&
1045 (ptype->af_packet_priv == NULL ||
1046 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1047 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1051 /* skb->nh should be correctly
1052 set by sender, so that the second statement is
1053 just protection against buggy protocols.
1055 skb2->mac.raw = skb2->data;
1057 if (skb2->nh.raw < skb2->data ||
1058 skb2->nh.raw > skb2->tail) {
1059 if (net_ratelimit())
1060 printk(KERN_CRIT "protocol %04x is "
1062 skb2->protocol, dev->name);
1063 skb2->nh.raw = skb2->data;
1066 skb2->h.raw = skb2->nh.raw;
1067 skb2->pkt_type = PACKET_OUTGOING;
1068 ptype->func(skb2, skb->dev, ptype, skb->dev);
1075 * Invalidate hardware checksum when packet is to be mangled, and
1076 * complete checksum manually on outgoing path.
1078 int skb_checksum_help(struct sk_buff *skb, int inward)
1081 int ret = 0, offset = skb->h.raw - skb->data;
1084 skb->ip_summed = CHECKSUM_NONE;
1088 if (skb_cloned(skb)) {
1089 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1094 BUG_ON(offset > (int)skb->len);
1095 csum = skb_checksum(skb, offset, skb->len-offset, 0);
1097 offset = skb->tail - skb->h.raw;
1098 BUG_ON(offset <= 0);
1099 BUG_ON(skb->csum + 2 > offset);
1101 *(u16*)(skb->h.raw + skb->csum) = csum_fold(csum);
1102 skb->ip_summed = CHECKSUM_NONE;
1107 /* Take action when hardware reception checksum errors are detected. */
1109 void netdev_rx_csum_fault(struct net_device *dev)
1111 if (net_ratelimit()) {
1112 printk(KERN_ERR "%s: hw csum failure.\n",
1113 dev ? dev->name : "<unknown>");
1117 EXPORT_SYMBOL(netdev_rx_csum_fault);
1120 #ifdef CONFIG_HIGHMEM
1121 /* Actually, we should eliminate this check as soon as we know, that:
1122 * 1. IOMMU is present and allows to map all the memory.
1123 * 2. No high memory really exists on this machine.
1126 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1130 if (dev->features & NETIF_F_HIGHDMA)
1133 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1134 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1140 #define illegal_highdma(dev, skb) (0)
1143 /* Keep head the same: replace data */
1144 int __skb_linearize(struct sk_buff *skb, gfp_t gfp_mask)
1149 struct skb_shared_info *ninfo;
1150 int headerlen = skb->data - skb->head;
1151 int expand = (skb->tail + skb->data_len) - skb->end;
1153 if (skb_shared(skb))
1159 size = skb->end - skb->head + expand;
1160 size = SKB_DATA_ALIGN(size);
1161 data = kmalloc(size + sizeof(struct skb_shared_info), gfp_mask);
1165 /* Copy entire thing */
1166 if (skb_copy_bits(skb, -headerlen, data, headerlen + skb->len))
1170 ninfo = (struct skb_shared_info*)(data + size);
1171 atomic_set(&ninfo->dataref, 1);
1172 ninfo->tso_size = skb_shinfo(skb)->tso_size;
1173 ninfo->tso_segs = skb_shinfo(skb)->tso_segs;
1174 ninfo->nr_frags = 0;
1175 ninfo->frag_list = NULL;
1177 /* Offset between the two in bytes */
1178 offset = data - skb->head;
1180 /* Free old data. */
1181 skb_release_data(skb);
1184 skb->end = data + size;
1186 /* Set up new pointers */
1187 skb->h.raw += offset;
1188 skb->nh.raw += offset;
1189 skb->mac.raw += offset;
1190 skb->tail += offset;
1191 skb->data += offset;
1193 /* We are no longer a clone, even if we were. */
1196 skb->tail += skb->data_len;
1201 #define HARD_TX_LOCK(dev, cpu) { \
1202 if ((dev->features & NETIF_F_LLTX) == 0) { \
1203 spin_lock(&dev->xmit_lock); \
1204 dev->xmit_lock_owner = cpu; \
1208 #define HARD_TX_UNLOCK(dev) { \
1209 if ((dev->features & NETIF_F_LLTX) == 0) { \
1210 dev->xmit_lock_owner = -1; \
1211 spin_unlock(&dev->xmit_lock); \
1216 * dev_queue_xmit - transmit a buffer
1217 * @skb: buffer to transmit
1219 * Queue a buffer for transmission to a network device. The caller must
1220 * have set the device and priority and built the buffer before calling
1221 * this function. The function can be called from an interrupt.
1223 * A negative errno code is returned on a failure. A success does not
1224 * guarantee the frame will be transmitted as it may be dropped due
1225 * to congestion or traffic shaping.
1227 * -----------------------------------------------------------------------------------
1228 * I notice this method can also return errors from the queue disciplines,
1229 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1232 * Regardless of the return value, the skb is consumed, so it is currently
1233 * difficult to retry a send to this method. (You can bump the ref count
1234 * before sending to hold a reference for retry if you are careful.)
1236 * When calling this method, interrupts MUST be enabled. This is because
1237 * the BH enable code must have IRQs enabled so that it will not deadlock.
1241 int dev_queue_xmit(struct sk_buff *skb)
1243 struct net_device *dev = skb->dev;
1247 if (skb_shinfo(skb)->frag_list &&
1248 !(dev->features & NETIF_F_FRAGLIST) &&
1249 __skb_linearize(skb, GFP_ATOMIC))
1252 /* Fragmented skb is linearized if device does not support SG,
1253 * or if at least one of fragments is in highmem and device
1254 * does not support DMA from it.
1256 if (skb_shinfo(skb)->nr_frags &&
1257 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1258 __skb_linearize(skb, GFP_ATOMIC))
1261 /* If packet is not checksummed and device does not support
1262 * checksumming for this protocol, complete checksumming here.
1264 if (skb->ip_summed == CHECKSUM_HW &&
1265 (!(dev->features & (NETIF_F_HW_CSUM | NETIF_F_NO_CSUM)) &&
1266 (!(dev->features & NETIF_F_IP_CSUM) ||
1267 skb->protocol != htons(ETH_P_IP))))
1268 if (skb_checksum_help(skb, 0))
1271 spin_lock_prefetch(&dev->queue_lock);
1273 /* Disable soft irqs for various locks below. Also
1274 * stops preemption for RCU.
1278 /* Updates of qdisc are serialized by queue_lock.
1279 * The struct Qdisc which is pointed to by qdisc is now a
1280 * rcu structure - it may be accessed without acquiring
1281 * a lock (but the structure may be stale.) The freeing of the
1282 * qdisc will be deferred until it's known that there are no
1283 * more references to it.
1285 * If the qdisc has an enqueue function, we still need to
1286 * hold the queue_lock before calling it, since queue_lock
1287 * also serializes access to the device queue.
1290 q = rcu_dereference(dev->qdisc);
1291 #ifdef CONFIG_NET_CLS_ACT
1292 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1295 /* Grab device queue */
1296 spin_lock(&dev->queue_lock);
1298 rc = q->enqueue(skb, q);
1302 spin_unlock(&dev->queue_lock);
1303 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1307 /* The device has no queue. Common case for software devices:
1308 loopback, all the sorts of tunnels...
1310 Really, it is unlikely that xmit_lock protection is necessary here.
1311 (f.e. loopback and IP tunnels are clean ignoring statistics
1313 However, it is possible, that they rely on protection
1316 Check this and shot the lock. It is not prone from deadlocks.
1317 Either shot noqueue qdisc, it is even simpler 8)
1319 if (dev->flags & IFF_UP) {
1320 int cpu = smp_processor_id(); /* ok because BHs are off */
1322 if (dev->xmit_lock_owner != cpu) {
1324 HARD_TX_LOCK(dev, cpu);
1326 if (!netif_queue_stopped(dev)) {
1328 dev_queue_xmit_nit(skb, dev);
1331 if (!dev->hard_start_xmit(skb, dev)) {
1332 HARD_TX_UNLOCK(dev);
1336 HARD_TX_UNLOCK(dev);
1337 if (net_ratelimit())
1338 printk(KERN_CRIT "Virtual device %s asks to "
1339 "queue packet!\n", dev->name);
1341 /* Recursion is detected! It is possible,
1343 if (net_ratelimit())
1344 printk(KERN_CRIT "Dead loop on virtual device "
1345 "%s, fix it urgently!\n", dev->name);
1361 /*=======================================================================
1363 =======================================================================*/
1365 int netdev_max_backlog = 1000;
1366 int netdev_budget = 300;
1367 int weight_p = 64; /* old backlog weight */
1369 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1373 * netif_rx - post buffer to the network code
1374 * @skb: buffer to post
1376 * This function receives a packet from a device driver and queues it for
1377 * the upper (protocol) levels to process. It always succeeds. The buffer
1378 * may be dropped during processing for congestion control or by the
1382 * NET_RX_SUCCESS (no congestion)
1383 * NET_RX_CN_LOW (low congestion)
1384 * NET_RX_CN_MOD (moderate congestion)
1385 * NET_RX_CN_HIGH (high congestion)
1386 * NET_RX_DROP (packet was dropped)
1390 int netif_rx(struct sk_buff *skb)
1392 struct softnet_data *queue;
1393 unsigned long flags;
1395 /* if netpoll wants it, pretend we never saw it */
1396 if (netpoll_rx(skb))
1399 if (!skb->tstamp.off_sec)
1403 * The code is rearranged so that the path is the most
1404 * short when CPU is congested, but is still operating.
1406 local_irq_save(flags);
1407 queue = &__get_cpu_var(softnet_data);
1409 __get_cpu_var(netdev_rx_stat).total++;
1410 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1411 if (queue->input_pkt_queue.qlen) {
1414 __skb_queue_tail(&queue->input_pkt_queue, skb);
1415 local_irq_restore(flags);
1416 return NET_RX_SUCCESS;
1419 netif_rx_schedule(&queue->backlog_dev);
1423 __get_cpu_var(netdev_rx_stat).dropped++;
1424 local_irq_restore(flags);
1430 int netif_rx_ni(struct sk_buff *skb)
1435 err = netif_rx(skb);
1436 if (local_softirq_pending())
1443 EXPORT_SYMBOL(netif_rx_ni);
1445 static inline struct net_device *skb_bond(struct sk_buff *skb)
1447 struct net_device *dev = skb->dev;
1451 * On bonding slaves other than the currently active
1452 * slave, suppress duplicates except for 802.3ad
1453 * ETH_P_SLOW and alb non-mcast/bcast.
1455 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
1456 if (dev->master->priv_flags & IFF_MASTER_ALB) {
1457 if (skb->pkt_type != PACKET_BROADCAST &&
1458 skb->pkt_type != PACKET_MULTICAST)
1462 if (dev->master->priv_flags & IFF_MASTER_8023AD &&
1463 skb->protocol == __constant_htons(ETH_P_SLOW))
1470 skb->dev = dev->master;
1476 static void net_tx_action(struct softirq_action *h)
1478 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1480 if (sd->completion_queue) {
1481 struct sk_buff *clist;
1483 local_irq_disable();
1484 clist = sd->completion_queue;
1485 sd->completion_queue = NULL;
1489 struct sk_buff *skb = clist;
1490 clist = clist->next;
1492 BUG_TRAP(!atomic_read(&skb->users));
1497 if (sd->output_queue) {
1498 struct net_device *head;
1500 local_irq_disable();
1501 head = sd->output_queue;
1502 sd->output_queue = NULL;
1506 struct net_device *dev = head;
1507 head = head->next_sched;
1509 smp_mb__before_clear_bit();
1510 clear_bit(__LINK_STATE_SCHED, &dev->state);
1512 if (spin_trylock(&dev->queue_lock)) {
1514 spin_unlock(&dev->queue_lock);
1516 netif_schedule(dev);
1522 static __inline__ int deliver_skb(struct sk_buff *skb,
1523 struct packet_type *pt_prev,
1524 struct net_device *orig_dev)
1526 atomic_inc(&skb->users);
1527 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1530 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1531 int (*br_handle_frame_hook)(struct net_bridge_port *p, struct sk_buff **pskb);
1533 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1534 unsigned char *addr);
1535 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
1537 static __inline__ int handle_bridge(struct sk_buff **pskb,
1538 struct packet_type **pt_prev, int *ret,
1539 struct net_device *orig_dev)
1541 struct net_bridge_port *port;
1543 if ((*pskb)->pkt_type == PACKET_LOOPBACK ||
1544 (port = rcu_dereference((*pskb)->dev->br_port)) == NULL)
1548 *ret = deliver_skb(*pskb, *pt_prev, orig_dev);
1552 return br_handle_frame_hook(port, pskb);
1555 #define handle_bridge(skb, pt_prev, ret, orig_dev) (0)
1558 #ifdef CONFIG_NET_CLS_ACT
1559 /* TODO: Maybe we should just force sch_ingress to be compiled in
1560 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
1561 * a compare and 2 stores extra right now if we dont have it on
1562 * but have CONFIG_NET_CLS_ACT
1563 * NOTE: This doesnt stop any functionality; if you dont have
1564 * the ingress scheduler, you just cant add policies on ingress.
1567 static int ing_filter(struct sk_buff *skb)
1570 struct net_device *dev = skb->dev;
1571 int result = TC_ACT_OK;
1573 if (dev->qdisc_ingress) {
1574 __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
1575 if (MAX_RED_LOOP < ttl++) {
1576 printk("Redir loop detected Dropping packet (%s->%s)\n",
1577 skb->input_dev->name, skb->dev->name);
1581 skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl);
1583 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS);
1585 spin_lock(&dev->ingress_lock);
1586 if ((q = dev->qdisc_ingress) != NULL)
1587 result = q->enqueue(skb, q);
1588 spin_unlock(&dev->ingress_lock);
1596 int netif_receive_skb(struct sk_buff *skb)
1598 struct packet_type *ptype, *pt_prev;
1599 struct net_device *orig_dev;
1600 int ret = NET_RX_DROP;
1601 unsigned short type;
1603 /* if we've gotten here through NAPI, check netpoll */
1604 if (skb->dev->poll && netpoll_rx(skb))
1607 if (!skb->tstamp.off_sec)
1610 if (!skb->input_dev)
1611 skb->input_dev = skb->dev;
1613 orig_dev = skb_bond(skb);
1618 __get_cpu_var(netdev_rx_stat).total++;
1620 skb->h.raw = skb->nh.raw = skb->data;
1621 skb->mac_len = skb->nh.raw - skb->mac.raw;
1627 #ifdef CONFIG_NET_CLS_ACT
1628 if (skb->tc_verd & TC_NCLS) {
1629 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
1634 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1635 if (!ptype->dev || ptype->dev == skb->dev) {
1637 ret = deliver_skb(skb, pt_prev, orig_dev);
1642 #ifdef CONFIG_NET_CLS_ACT
1644 ret = deliver_skb(skb, pt_prev, orig_dev);
1645 pt_prev = NULL; /* noone else should process this after*/
1647 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
1650 ret = ing_filter(skb);
1652 if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
1661 handle_diverter(skb);
1663 if (handle_bridge(&skb, &pt_prev, &ret, orig_dev))
1666 type = skb->protocol;
1667 list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {
1668 if (ptype->type == type &&
1669 (!ptype->dev || ptype->dev == skb->dev)) {
1671 ret = deliver_skb(skb, pt_prev, orig_dev);
1677 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1680 /* Jamal, now you will not able to escape explaining
1681 * me how you were going to use this. :-)
1691 static int process_backlog(struct net_device *backlog_dev, int *budget)
1694 int quota = min(backlog_dev->quota, *budget);
1695 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1696 unsigned long start_time = jiffies;
1698 backlog_dev->weight = weight_p;
1700 struct sk_buff *skb;
1701 struct net_device *dev;
1703 local_irq_disable();
1704 skb = __skb_dequeue(&queue->input_pkt_queue);
1711 netif_receive_skb(skb);
1717 if (work >= quota || jiffies - start_time > 1)
1722 backlog_dev->quota -= work;
1727 backlog_dev->quota -= work;
1730 list_del(&backlog_dev->poll_list);
1731 smp_mb__before_clear_bit();
1732 netif_poll_enable(backlog_dev);
1738 static void net_rx_action(struct softirq_action *h)
1740 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1741 unsigned long start_time = jiffies;
1742 int budget = netdev_budget;
1745 local_irq_disable();
1747 while (!list_empty(&queue->poll_list)) {
1748 struct net_device *dev;
1750 if (budget <= 0 || jiffies - start_time > 1)
1755 dev = list_entry(queue->poll_list.next,
1756 struct net_device, poll_list);
1757 have = netpoll_poll_lock(dev);
1759 if (dev->quota <= 0 || dev->poll(dev, &budget)) {
1760 netpoll_poll_unlock(have);
1761 local_irq_disable();
1762 list_del(&dev->poll_list);
1763 list_add_tail(&dev->poll_list, &queue->poll_list);
1765 dev->quota += dev->weight;
1767 dev->quota = dev->weight;
1769 netpoll_poll_unlock(have);
1771 local_irq_disable();
1779 __get_cpu_var(netdev_rx_stat).time_squeeze++;
1780 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
1784 static gifconf_func_t * gifconf_list [NPROTO];
1787 * register_gifconf - register a SIOCGIF handler
1788 * @family: Address family
1789 * @gifconf: Function handler
1791 * Register protocol dependent address dumping routines. The handler
1792 * that is passed must not be freed or reused until it has been replaced
1793 * by another handler.
1795 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
1797 if (family >= NPROTO)
1799 gifconf_list[family] = gifconf;
1805 * Map an interface index to its name (SIOCGIFNAME)
1809 * We need this ioctl for efficient implementation of the
1810 * if_indextoname() function required by the IPv6 API. Without
1811 * it, we would have to search all the interfaces to find a
1815 static int dev_ifname(struct ifreq __user *arg)
1817 struct net_device *dev;
1821 * Fetch the caller's info block.
1824 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
1827 read_lock(&dev_base_lock);
1828 dev = __dev_get_by_index(ifr.ifr_ifindex);
1830 read_unlock(&dev_base_lock);
1834 strcpy(ifr.ifr_name, dev->name);
1835 read_unlock(&dev_base_lock);
1837 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
1843 * Perform a SIOCGIFCONF call. This structure will change
1844 * size eventually, and there is nothing I can do about it.
1845 * Thus we will need a 'compatibility mode'.
1848 static int dev_ifconf(char __user *arg)
1851 struct net_device *dev;
1858 * Fetch the caller's info block.
1861 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
1868 * Loop over the interfaces, and write an info block for each.
1872 for (dev = dev_base; dev; dev = dev->next) {
1873 for (i = 0; i < NPROTO; i++) {
1874 if (gifconf_list[i]) {
1877 done = gifconf_list[i](dev, NULL, 0);
1879 done = gifconf_list[i](dev, pos + total,
1889 * All done. Write the updated control block back to the caller.
1891 ifc.ifc_len = total;
1894 * Both BSD and Solaris return 0 here, so we do too.
1896 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
1899 #ifdef CONFIG_PROC_FS
1901 * This is invoked by the /proc filesystem handler to display a device
1904 static __inline__ struct net_device *dev_get_idx(loff_t pos)
1906 struct net_device *dev;
1909 for (i = 0, dev = dev_base; dev && i < pos; ++i, dev = dev->next);
1911 return i == pos ? dev : NULL;
1914 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
1916 read_lock(&dev_base_lock);
1917 return *pos ? dev_get_idx(*pos - 1) : SEQ_START_TOKEN;
1920 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1923 return v == SEQ_START_TOKEN ? dev_base : ((struct net_device *)v)->next;
1926 void dev_seq_stop(struct seq_file *seq, void *v)
1928 read_unlock(&dev_base_lock);
1931 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
1933 if (dev->get_stats) {
1934 struct net_device_stats *stats = dev->get_stats(dev);
1936 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
1937 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
1938 dev->name, stats->rx_bytes, stats->rx_packets,
1940 stats->rx_dropped + stats->rx_missed_errors,
1941 stats->rx_fifo_errors,
1942 stats->rx_length_errors + stats->rx_over_errors +
1943 stats->rx_crc_errors + stats->rx_frame_errors,
1944 stats->rx_compressed, stats->multicast,
1945 stats->tx_bytes, stats->tx_packets,
1946 stats->tx_errors, stats->tx_dropped,
1947 stats->tx_fifo_errors, stats->collisions,
1948 stats->tx_carrier_errors +
1949 stats->tx_aborted_errors +
1950 stats->tx_window_errors +
1951 stats->tx_heartbeat_errors,
1952 stats->tx_compressed);
1954 seq_printf(seq, "%6s: No statistics available.\n", dev->name);
1958 * Called from the PROCfs module. This now uses the new arbitrary sized
1959 * /proc/net interface to create /proc/net/dev
1961 static int dev_seq_show(struct seq_file *seq, void *v)
1963 if (v == SEQ_START_TOKEN)
1964 seq_puts(seq, "Inter-| Receive "
1966 " face |bytes packets errs drop fifo frame "
1967 "compressed multicast|bytes packets errs "
1968 "drop fifo colls carrier compressed\n");
1970 dev_seq_printf_stats(seq, v);
1974 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
1976 struct netif_rx_stats *rc = NULL;
1978 while (*pos < NR_CPUS)
1979 if (cpu_online(*pos)) {
1980 rc = &per_cpu(netdev_rx_stat, *pos);
1987 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
1989 return softnet_get_online(pos);
1992 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1995 return softnet_get_online(pos);
1998 static void softnet_seq_stop(struct seq_file *seq, void *v)
2002 static int softnet_seq_show(struct seq_file *seq, void *v)
2004 struct netif_rx_stats *s = v;
2006 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2007 s->total, s->dropped, s->time_squeeze, 0,
2008 0, 0, 0, 0, /* was fastroute */
2013 static struct seq_operations dev_seq_ops = {
2014 .start = dev_seq_start,
2015 .next = dev_seq_next,
2016 .stop = dev_seq_stop,
2017 .show = dev_seq_show,
2020 static int dev_seq_open(struct inode *inode, struct file *file)
2022 return seq_open(file, &dev_seq_ops);
2025 static struct file_operations dev_seq_fops = {
2026 .owner = THIS_MODULE,
2027 .open = dev_seq_open,
2029 .llseek = seq_lseek,
2030 .release = seq_release,
2033 static struct seq_operations softnet_seq_ops = {
2034 .start = softnet_seq_start,
2035 .next = softnet_seq_next,
2036 .stop = softnet_seq_stop,
2037 .show = softnet_seq_show,
2040 static int softnet_seq_open(struct inode *inode, struct file *file)
2042 return seq_open(file, &softnet_seq_ops);
2045 static struct file_operations softnet_seq_fops = {
2046 .owner = THIS_MODULE,
2047 .open = softnet_seq_open,
2049 .llseek = seq_lseek,
2050 .release = seq_release,
2053 #ifdef CONFIG_WIRELESS_EXT
2054 extern int wireless_proc_init(void);
2056 #define wireless_proc_init() 0
2059 static int __init dev_proc_init(void)
2063 if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops))
2065 if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops))
2067 if (wireless_proc_init())
2073 proc_net_remove("softnet_stat");
2075 proc_net_remove("dev");
2079 #define dev_proc_init() 0
2080 #endif /* CONFIG_PROC_FS */
2084 * netdev_set_master - set up master/slave pair
2085 * @slave: slave device
2086 * @master: new master device
2088 * Changes the master device of the slave. Pass %NULL to break the
2089 * bonding. The caller must hold the RTNL semaphore. On a failure
2090 * a negative errno code is returned. On success the reference counts
2091 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2092 * function returns zero.
2094 int netdev_set_master(struct net_device *slave, struct net_device *master)
2096 struct net_device *old = slave->master;
2106 slave->master = master;
2114 slave->flags |= IFF_SLAVE;
2116 slave->flags &= ~IFF_SLAVE;
2118 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2123 * dev_set_promiscuity - update promiscuity count on a device
2127 * Add or remove promsicuity from a device. While the count in the device
2128 * remains above zero the interface remains promiscuous. Once it hits zero
2129 * the device reverts back to normal filtering operation. A negative inc
2130 * value is used to drop promiscuity on the device.
2132 void dev_set_promiscuity(struct net_device *dev, int inc)
2134 unsigned short old_flags = dev->flags;
2136 if ((dev->promiscuity += inc) == 0)
2137 dev->flags &= ~IFF_PROMISC;
2139 dev->flags |= IFF_PROMISC;
2140 if (dev->flags != old_flags) {
2142 printk(KERN_INFO "device %s %s promiscuous mode\n",
2143 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2149 * dev_set_allmulti - update allmulti count on a device
2153 * Add or remove reception of all multicast frames to a device. While the
2154 * count in the device remains above zero the interface remains listening
2155 * to all interfaces. Once it hits zero the device reverts back to normal
2156 * filtering operation. A negative @inc value is used to drop the counter
2157 * when releasing a resource needing all multicasts.
2160 void dev_set_allmulti(struct net_device *dev, int inc)
2162 unsigned short old_flags = dev->flags;
2164 dev->flags |= IFF_ALLMULTI;
2165 if ((dev->allmulti += inc) == 0)
2166 dev->flags &= ~IFF_ALLMULTI;
2167 if (dev->flags ^ old_flags)
2171 unsigned dev_get_flags(const struct net_device *dev)
2175 flags = (dev->flags & ~(IFF_PROMISC |
2180 (dev->gflags & (IFF_PROMISC |
2183 if (netif_running(dev)) {
2184 if (netif_oper_up(dev))
2185 flags |= IFF_RUNNING;
2186 if (netif_carrier_ok(dev))
2187 flags |= IFF_LOWER_UP;
2188 if (netif_dormant(dev))
2189 flags |= IFF_DORMANT;
2195 int dev_change_flags(struct net_device *dev, unsigned flags)
2198 int old_flags = dev->flags;
2201 * Set the flags on our device.
2204 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
2205 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
2207 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
2211 * Load in the correct multicast list now the flags have changed.
2217 * Have we downed the interface. We handle IFF_UP ourselves
2218 * according to user attempts to set it, rather than blindly
2223 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
2224 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
2230 if (dev->flags & IFF_UP &&
2231 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
2233 notifier_call_chain(&netdev_chain, NETDEV_CHANGE, dev);
2235 if ((flags ^ dev->gflags) & IFF_PROMISC) {
2236 int inc = (flags & IFF_PROMISC) ? +1 : -1;
2237 dev->gflags ^= IFF_PROMISC;
2238 dev_set_promiscuity(dev, inc);
2241 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
2242 is important. Some (broken) drivers set IFF_PROMISC, when
2243 IFF_ALLMULTI is requested not asking us and not reporting.
2245 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
2246 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
2247 dev->gflags ^= IFF_ALLMULTI;
2248 dev_set_allmulti(dev, inc);
2251 if (old_flags ^ dev->flags)
2252 rtmsg_ifinfo(RTM_NEWLINK, dev, old_flags ^ dev->flags);
2257 int dev_set_mtu(struct net_device *dev, int new_mtu)
2261 if (new_mtu == dev->mtu)
2264 /* MTU must be positive. */
2268 if (!netif_device_present(dev))
2272 if (dev->change_mtu)
2273 err = dev->change_mtu(dev, new_mtu);
2276 if (!err && dev->flags & IFF_UP)
2277 notifier_call_chain(&netdev_chain,
2278 NETDEV_CHANGEMTU, dev);
2282 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
2286 if (!dev->set_mac_address)
2288 if (sa->sa_family != dev->type)
2290 if (!netif_device_present(dev))
2292 err = dev->set_mac_address(dev, sa);
2294 notifier_call_chain(&netdev_chain, NETDEV_CHANGEADDR, dev);
2299 * Perform the SIOCxIFxxx calls.
2301 static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
2304 struct net_device *dev = __dev_get_by_name(ifr->ifr_name);
2310 case SIOCGIFFLAGS: /* Get interface flags */
2311 ifr->ifr_flags = dev_get_flags(dev);
2314 case SIOCSIFFLAGS: /* Set interface flags */
2315 return dev_change_flags(dev, ifr->ifr_flags);
2317 case SIOCGIFMETRIC: /* Get the metric on the interface
2318 (currently unused) */
2319 ifr->ifr_metric = 0;
2322 case SIOCSIFMETRIC: /* Set the metric on the interface
2323 (currently unused) */
2326 case SIOCGIFMTU: /* Get the MTU of a device */
2327 ifr->ifr_mtu = dev->mtu;
2330 case SIOCSIFMTU: /* Set the MTU of a device */
2331 return dev_set_mtu(dev, ifr->ifr_mtu);
2335 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
2337 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
2338 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2339 ifr->ifr_hwaddr.sa_family = dev->type;
2343 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
2345 case SIOCSIFHWBROADCAST:
2346 if (ifr->ifr_hwaddr.sa_family != dev->type)
2348 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
2349 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2350 notifier_call_chain(&netdev_chain,
2351 NETDEV_CHANGEADDR, dev);
2355 ifr->ifr_map.mem_start = dev->mem_start;
2356 ifr->ifr_map.mem_end = dev->mem_end;
2357 ifr->ifr_map.base_addr = dev->base_addr;
2358 ifr->ifr_map.irq = dev->irq;
2359 ifr->ifr_map.dma = dev->dma;
2360 ifr->ifr_map.port = dev->if_port;
2364 if (dev->set_config) {
2365 if (!netif_device_present(dev))
2367 return dev->set_config(dev, &ifr->ifr_map);
2372 if (!dev->set_multicast_list ||
2373 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2375 if (!netif_device_present(dev))
2377 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
2381 if (!dev->set_multicast_list ||
2382 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2384 if (!netif_device_present(dev))
2386 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
2390 ifr->ifr_ifindex = dev->ifindex;
2394 ifr->ifr_qlen = dev->tx_queue_len;
2398 if (ifr->ifr_qlen < 0)
2400 dev->tx_queue_len = ifr->ifr_qlen;
2404 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
2405 return dev_change_name(dev, ifr->ifr_newname);
2408 * Unknown or private ioctl
2412 if ((cmd >= SIOCDEVPRIVATE &&
2413 cmd <= SIOCDEVPRIVATE + 15) ||
2414 cmd == SIOCBONDENSLAVE ||
2415 cmd == SIOCBONDRELEASE ||
2416 cmd == SIOCBONDSETHWADDR ||
2417 cmd == SIOCBONDSLAVEINFOQUERY ||
2418 cmd == SIOCBONDINFOQUERY ||
2419 cmd == SIOCBONDCHANGEACTIVE ||
2420 cmd == SIOCGMIIPHY ||
2421 cmd == SIOCGMIIREG ||
2422 cmd == SIOCSMIIREG ||
2423 cmd == SIOCBRADDIF ||
2424 cmd == SIOCBRDELIF ||
2425 cmd == SIOCWANDEV) {
2427 if (dev->do_ioctl) {
2428 if (netif_device_present(dev))
2429 err = dev->do_ioctl(dev, ifr,
2442 * This function handles all "interface"-type I/O control requests. The actual
2443 * 'doing' part of this is dev_ifsioc above.
2447 * dev_ioctl - network device ioctl
2448 * @cmd: command to issue
2449 * @arg: pointer to a struct ifreq in user space
2451 * Issue ioctl functions to devices. This is normally called by the
2452 * user space syscall interfaces but can sometimes be useful for
2453 * other purposes. The return value is the return from the syscall if
2454 * positive or a negative errno code on error.
2457 int dev_ioctl(unsigned int cmd, void __user *arg)
2463 /* One special case: SIOCGIFCONF takes ifconf argument
2464 and requires shared lock, because it sleeps writing
2468 if (cmd == SIOCGIFCONF) {
2470 ret = dev_ifconf((char __user *) arg);
2474 if (cmd == SIOCGIFNAME)
2475 return dev_ifname((struct ifreq __user *)arg);
2477 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2480 ifr.ifr_name[IFNAMSIZ-1] = 0;
2482 colon = strchr(ifr.ifr_name, ':');
2487 * See which interface the caller is talking about.
2492 * These ioctl calls:
2493 * - can be done by all.
2494 * - atomic and do not require locking.
2505 dev_load(ifr.ifr_name);
2506 read_lock(&dev_base_lock);
2507 ret = dev_ifsioc(&ifr, cmd);
2508 read_unlock(&dev_base_lock);
2512 if (copy_to_user(arg, &ifr,
2513 sizeof(struct ifreq)))
2519 dev_load(ifr.ifr_name);
2521 ret = dev_ethtool(&ifr);
2526 if (copy_to_user(arg, &ifr,
2527 sizeof(struct ifreq)))
2533 * These ioctl calls:
2534 * - require superuser power.
2535 * - require strict serialization.
2541 if (!capable(CAP_NET_ADMIN))
2543 dev_load(ifr.ifr_name);
2545 ret = dev_ifsioc(&ifr, cmd);
2550 if (copy_to_user(arg, &ifr,
2551 sizeof(struct ifreq)))
2557 * These ioctl calls:
2558 * - require superuser power.
2559 * - require strict serialization.
2560 * - do not return a value
2570 case SIOCSIFHWBROADCAST:
2573 case SIOCBONDENSLAVE:
2574 case SIOCBONDRELEASE:
2575 case SIOCBONDSETHWADDR:
2576 case SIOCBONDCHANGEACTIVE:
2579 if (!capable(CAP_NET_ADMIN))
2582 case SIOCBONDSLAVEINFOQUERY:
2583 case SIOCBONDINFOQUERY:
2584 dev_load(ifr.ifr_name);
2586 ret = dev_ifsioc(&ifr, cmd);
2591 /* Get the per device memory space. We can add this but
2592 * currently do not support it */
2594 /* Set the per device memory buffer space.
2595 * Not applicable in our case */
2600 * Unknown or private ioctl.
2603 if (cmd == SIOCWANDEV ||
2604 (cmd >= SIOCDEVPRIVATE &&
2605 cmd <= SIOCDEVPRIVATE + 15)) {
2606 dev_load(ifr.ifr_name);
2608 ret = dev_ifsioc(&ifr, cmd);
2610 if (!ret && copy_to_user(arg, &ifr,
2611 sizeof(struct ifreq)))
2615 #ifdef CONFIG_WIRELESS_EXT
2616 /* Take care of Wireless Extensions */
2617 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
2618 /* If command is `set a parameter', or
2619 * `get the encoding parameters', check if
2620 * the user has the right to do it */
2621 if (IW_IS_SET(cmd) || cmd == SIOCGIWENCODE) {
2622 if (!capable(CAP_NET_ADMIN))
2625 dev_load(ifr.ifr_name);
2627 /* Follow me in net/core/wireless.c */
2628 ret = wireless_process_ioctl(&ifr, cmd);
2630 if (IW_IS_GET(cmd) &&
2631 copy_to_user(arg, &ifr,
2632 sizeof(struct ifreq)))
2636 #endif /* CONFIG_WIRELESS_EXT */
2643 * dev_new_index - allocate an ifindex
2645 * Returns a suitable unique value for a new device interface
2646 * number. The caller must hold the rtnl semaphore or the
2647 * dev_base_lock to be sure it remains unique.
2649 static int dev_new_index(void)
2655 if (!__dev_get_by_index(ifindex))
2660 static int dev_boot_phase = 1;
2662 /* Delayed registration/unregisteration */
2663 static DEFINE_SPINLOCK(net_todo_list_lock);
2664 static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list);
2666 static inline void net_set_todo(struct net_device *dev)
2668 spin_lock(&net_todo_list_lock);
2669 list_add_tail(&dev->todo_list, &net_todo_list);
2670 spin_unlock(&net_todo_list_lock);
2674 * register_netdevice - register a network device
2675 * @dev: device to register
2677 * Take a completed network device structure and add it to the kernel
2678 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
2679 * chain. 0 is returned on success. A negative errno code is returned
2680 * on a failure to set up the device, or if the name is a duplicate.
2682 * Callers must hold the rtnl semaphore. You may want
2683 * register_netdev() instead of this.
2686 * The locking appears insufficient to guarantee two parallel registers
2687 * will not get the same name.
2690 int register_netdevice(struct net_device *dev)
2692 struct hlist_head *head;
2693 struct hlist_node *p;
2696 BUG_ON(dev_boot_phase);
2699 /* When net_device's are persistent, this will be fatal. */
2700 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
2702 spin_lock_init(&dev->queue_lock);
2703 spin_lock_init(&dev->xmit_lock);
2704 dev->xmit_lock_owner = -1;
2705 #ifdef CONFIG_NET_CLS_ACT
2706 spin_lock_init(&dev->ingress_lock);
2709 ret = alloc_divert_blk(dev);
2715 /* Init, if this function is available */
2717 ret = dev->init(dev);
2725 if (!dev_valid_name(dev->name)) {
2730 dev->ifindex = dev_new_index();
2731 if (dev->iflink == -1)
2732 dev->iflink = dev->ifindex;
2734 /* Check for existence of name */
2735 head = dev_name_hash(dev->name);
2736 hlist_for_each(p, head) {
2737 struct net_device *d
2738 = hlist_entry(p, struct net_device, name_hlist);
2739 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
2745 /* Fix illegal SG+CSUM combinations. */
2746 if ((dev->features & NETIF_F_SG) &&
2747 !(dev->features & (NETIF_F_IP_CSUM |
2749 NETIF_F_HW_CSUM))) {
2750 printk("%s: Dropping NETIF_F_SG since no checksum feature.\n",
2752 dev->features &= ~NETIF_F_SG;
2755 /* TSO requires that SG is present as well. */
2756 if ((dev->features & NETIF_F_TSO) &&
2757 !(dev->features & NETIF_F_SG)) {
2758 printk("%s: Dropping NETIF_F_TSO since no SG feature.\n",
2760 dev->features &= ~NETIF_F_TSO;
2762 if (dev->features & NETIF_F_UFO) {
2763 if (!(dev->features & NETIF_F_HW_CSUM)) {
2764 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
2765 "NETIF_F_HW_CSUM feature.\n",
2767 dev->features &= ~NETIF_F_UFO;
2769 if (!(dev->features & NETIF_F_SG)) {
2770 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
2771 "NETIF_F_SG feature.\n",
2773 dev->features &= ~NETIF_F_UFO;
2778 * nil rebuild_header routine,
2779 * that should be never called and used as just bug trap.
2782 if (!dev->rebuild_header)
2783 dev->rebuild_header = default_rebuild_header;
2786 * Default initial state at registry is that the
2787 * device is present.
2790 set_bit(__LINK_STATE_PRESENT, &dev->state);
2793 dev_init_scheduler(dev);
2794 write_lock_bh(&dev_base_lock);
2796 dev_tail = &dev->next;
2797 hlist_add_head(&dev->name_hlist, head);
2798 hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex));
2800 dev->reg_state = NETREG_REGISTERING;
2801 write_unlock_bh(&dev_base_lock);
2803 /* Notify protocols, that a new device appeared. */
2804 notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
2806 /* Finish registration after unlock */
2813 free_divert_blk(dev);
2818 * register_netdev - register a network device
2819 * @dev: device to register
2821 * Take a completed network device structure and add it to the kernel
2822 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
2823 * chain. 0 is returned on success. A negative errno code is returned
2824 * on a failure to set up the device, or if the name is a duplicate.
2826 * This is a wrapper around register_netdev that takes the rtnl semaphore
2827 * and expands the device name if you passed a format string to
2830 int register_netdev(struct net_device *dev)
2837 * If the name is a format string the caller wants us to do a
2840 if (strchr(dev->name, '%')) {
2841 err = dev_alloc_name(dev, dev->name);
2847 * Back compatibility hook. Kill this one in 2.5
2849 if (dev->name[0] == 0 || dev->name[0] == ' ') {
2850 err = dev_alloc_name(dev, "eth%d");
2855 err = register_netdevice(dev);
2860 EXPORT_SYMBOL(register_netdev);
2863 * netdev_wait_allrefs - wait until all references are gone.
2865 * This is called when unregistering network devices.
2867 * Any protocol or device that holds a reference should register
2868 * for netdevice notification, and cleanup and put back the
2869 * reference if they receive an UNREGISTER event.
2870 * We can get stuck here if buggy protocols don't correctly
2873 static void netdev_wait_allrefs(struct net_device *dev)
2875 unsigned long rebroadcast_time, warning_time;
2877 rebroadcast_time = warning_time = jiffies;
2878 while (atomic_read(&dev->refcnt) != 0) {
2879 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
2882 /* Rebroadcast unregister notification */
2883 notifier_call_chain(&netdev_chain,
2884 NETDEV_UNREGISTER, dev);
2886 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
2888 /* We must not have linkwatch events
2889 * pending on unregister. If this
2890 * happens, we simply run the queue
2891 * unscheduled, resulting in a noop
2894 linkwatch_run_queue();
2899 rebroadcast_time = jiffies;
2904 if (time_after(jiffies, warning_time + 10 * HZ)) {
2905 printk(KERN_EMERG "unregister_netdevice: "
2906 "waiting for %s to become free. Usage "
2908 dev->name, atomic_read(&dev->refcnt));
2909 warning_time = jiffies;
2918 * register_netdevice(x1);
2919 * register_netdevice(x2);
2921 * unregister_netdevice(y1);
2922 * unregister_netdevice(y2);
2928 * We are invoked by rtnl_unlock() after it drops the semaphore.
2929 * This allows us to deal with problems:
2930 * 1) We can create/delete sysfs objects which invoke hotplug
2931 * without deadlocking with linkwatch via keventd.
2932 * 2) Since we run with the RTNL semaphore not held, we can sleep
2933 * safely in order to wait for the netdev refcnt to drop to zero.
2935 static DECLARE_MUTEX(net_todo_run_mutex);
2936 void netdev_run_todo(void)
2938 struct list_head list = LIST_HEAD_INIT(list);
2942 /* Need to guard against multiple cpu's getting out of order. */
2943 down(&net_todo_run_mutex);
2945 /* Not safe to do outside the semaphore. We must not return
2946 * until all unregister events invoked by the local processor
2947 * have been completed (either by this todo run, or one on
2950 if (list_empty(&net_todo_list))
2953 /* Snapshot list, allow later requests */
2954 spin_lock(&net_todo_list_lock);
2955 list_splice_init(&net_todo_list, &list);
2956 spin_unlock(&net_todo_list_lock);
2958 while (!list_empty(&list)) {
2959 struct net_device *dev
2960 = list_entry(list.next, struct net_device, todo_list);
2961 list_del(&dev->todo_list);
2963 switch(dev->reg_state) {
2964 case NETREG_REGISTERING:
2965 err = netdev_register_sysfs(dev);
2967 printk(KERN_ERR "%s: failed sysfs registration (%d)\n",
2969 dev->reg_state = NETREG_REGISTERED;
2972 case NETREG_UNREGISTERING:
2973 netdev_unregister_sysfs(dev);
2974 dev->reg_state = NETREG_UNREGISTERED;
2976 netdev_wait_allrefs(dev);
2979 BUG_ON(atomic_read(&dev->refcnt));
2980 BUG_TRAP(!dev->ip_ptr);
2981 BUG_TRAP(!dev->ip6_ptr);
2982 BUG_TRAP(!dev->dn_ptr);
2985 /* It must be the very last action,
2986 * after this 'dev' may point to freed up memory.
2988 if (dev->destructor)
2989 dev->destructor(dev);
2993 printk(KERN_ERR "network todo '%s' but state %d\n",
2994 dev->name, dev->reg_state);
3000 up(&net_todo_run_mutex);
3004 * alloc_netdev - allocate network device
3005 * @sizeof_priv: size of private data to allocate space for
3006 * @name: device name format string
3007 * @setup: callback to initialize device
3009 * Allocates a struct net_device with private data area for driver use
3010 * and performs basic initialization.
3012 struct net_device *alloc_netdev(int sizeof_priv, const char *name,
3013 void (*setup)(struct net_device *))
3016 struct net_device *dev;
3019 /* ensure 32-byte alignment of both the device and private area */
3020 alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
3021 alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
3023 p = kmalloc(alloc_size, GFP_KERNEL);
3025 printk(KERN_ERR "alloc_dev: Unable to allocate device.\n");
3028 memset(p, 0, alloc_size);
3030 dev = (struct net_device *)
3031 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
3032 dev->padded = (char *)dev - (char *)p;
3035 dev->priv = netdev_priv(dev);
3038 strcpy(dev->name, name);
3041 EXPORT_SYMBOL(alloc_netdev);
3044 * free_netdev - free network device
3047 * This function does the last stage of destroying an allocated device
3048 * interface. The reference to the device object is released.
3049 * If this is the last reference then it will be freed.
3051 void free_netdev(struct net_device *dev)
3054 /* Compatiablity with error handling in drivers */
3055 if (dev->reg_state == NETREG_UNINITIALIZED) {
3056 kfree((char *)dev - dev->padded);
3060 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
3061 dev->reg_state = NETREG_RELEASED;
3063 /* will free via class release */
3064 class_device_put(&dev->class_dev);
3066 kfree((char *)dev - dev->padded);
3070 /* Synchronize with packet receive processing. */
3071 void synchronize_net(void)
3078 * unregister_netdevice - remove device from the kernel
3081 * This function shuts down a device interface and removes it
3082 * from the kernel tables. On success 0 is returned, on a failure
3083 * a negative errno code is returned.
3085 * Callers must hold the rtnl semaphore. You may want
3086 * unregister_netdev() instead of this.
3089 int unregister_netdevice(struct net_device *dev)
3091 struct net_device *d, **dp;
3093 BUG_ON(dev_boot_phase);
3096 /* Some devices call without registering for initialization unwind. */
3097 if (dev->reg_state == NETREG_UNINITIALIZED) {
3098 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3099 "was registered\n", dev->name, dev);
3103 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3105 /* If device is running, close it first. */
3106 if (dev->flags & IFF_UP)
3109 /* And unlink it from device chain. */
3110 for (dp = &dev_base; (d = *dp) != NULL; dp = &d->next) {
3112 write_lock_bh(&dev_base_lock);
3113 hlist_del(&dev->name_hlist);
3114 hlist_del(&dev->index_hlist);
3115 if (dev_tail == &dev->next)
3118 write_unlock_bh(&dev_base_lock);
3123 printk(KERN_ERR "unregister net_device: '%s' not found\n",
3128 dev->reg_state = NETREG_UNREGISTERING;
3132 /* Shutdown queueing discipline. */
3136 /* Notify protocols, that we are about to destroy
3137 this device. They should clean all the things.
3139 notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
3142 * Flush the multicast chain
3144 dev_mc_discard(dev);
3149 /* Notifier chain MUST detach us from master device. */
3150 BUG_TRAP(!dev->master);
3152 free_divert_blk(dev);
3154 /* Finish processing unregister after unlock */
3164 * unregister_netdev - remove device from the kernel
3167 * This function shuts down a device interface and removes it
3168 * from the kernel tables. On success 0 is returned, on a failure
3169 * a negative errno code is returned.
3171 * This is just a wrapper for unregister_netdevice that takes
3172 * the rtnl semaphore. In general you want to use this and not
3173 * unregister_netdevice.
3175 void unregister_netdev(struct net_device *dev)
3178 unregister_netdevice(dev);
3182 EXPORT_SYMBOL(unregister_netdev);
3184 #ifdef CONFIG_HOTPLUG_CPU
3185 static int dev_cpu_callback(struct notifier_block *nfb,
3186 unsigned long action,
3189 struct sk_buff **list_skb;
3190 struct net_device **list_net;
3191 struct sk_buff *skb;
3192 unsigned int cpu, oldcpu = (unsigned long)ocpu;
3193 struct softnet_data *sd, *oldsd;
3195 if (action != CPU_DEAD)
3198 local_irq_disable();
3199 cpu = smp_processor_id();
3200 sd = &per_cpu(softnet_data, cpu);
3201 oldsd = &per_cpu(softnet_data, oldcpu);
3203 /* Find end of our completion_queue. */
3204 list_skb = &sd->completion_queue;
3206 list_skb = &(*list_skb)->next;
3207 /* Append completion queue from offline CPU. */
3208 *list_skb = oldsd->completion_queue;
3209 oldsd->completion_queue = NULL;
3211 /* Find end of our output_queue. */
3212 list_net = &sd->output_queue;
3214 list_net = &(*list_net)->next_sched;
3215 /* Append output queue from offline CPU. */
3216 *list_net = oldsd->output_queue;
3217 oldsd->output_queue = NULL;
3219 raise_softirq_irqoff(NET_TX_SOFTIRQ);
3222 /* Process offline CPU's input_pkt_queue */
3223 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
3228 #endif /* CONFIG_HOTPLUG_CPU */
3232 * Initialize the DEV module. At boot time this walks the device list and
3233 * unhooks any devices that fail to initialise (normally hardware not
3234 * present) and leaves us with a valid list of present and active devices.
3239 * This is called single threaded during boot, so no need
3240 * to take the rtnl semaphore.
3242 static int __init net_dev_init(void)
3244 int i, rc = -ENOMEM;
3246 BUG_ON(!dev_boot_phase);
3250 if (dev_proc_init())
3253 if (netdev_sysfs_init())
3256 INIT_LIST_HEAD(&ptype_all);
3257 for (i = 0; i < 16; i++)
3258 INIT_LIST_HEAD(&ptype_base[i]);
3260 for (i = 0; i < ARRAY_SIZE(dev_name_head); i++)
3261 INIT_HLIST_HEAD(&dev_name_head[i]);
3263 for (i = 0; i < ARRAY_SIZE(dev_index_head); i++)
3264 INIT_HLIST_HEAD(&dev_index_head[i]);
3267 * Initialise the packet receive queues.
3271 struct softnet_data *queue;
3273 queue = &per_cpu(softnet_data, i);
3274 skb_queue_head_init(&queue->input_pkt_queue);
3275 queue->completion_queue = NULL;
3276 INIT_LIST_HEAD(&queue->poll_list);
3277 set_bit(__LINK_STATE_START, &queue->backlog_dev.state);
3278 queue->backlog_dev.weight = weight_p;
3279 queue->backlog_dev.poll = process_backlog;
3280 atomic_set(&queue->backlog_dev.refcnt, 1);
3285 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
3286 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
3288 hotcpu_notifier(dev_cpu_callback, 0);
3296 subsys_initcall(net_dev_init);
3298 EXPORT_SYMBOL(__dev_get_by_index);
3299 EXPORT_SYMBOL(__dev_get_by_name);
3300 EXPORT_SYMBOL(__dev_remove_pack);
3301 EXPORT_SYMBOL(__skb_linearize);
3302 EXPORT_SYMBOL(dev_valid_name);
3303 EXPORT_SYMBOL(dev_add_pack);
3304 EXPORT_SYMBOL(dev_alloc_name);
3305 EXPORT_SYMBOL(dev_close);
3306 EXPORT_SYMBOL(dev_get_by_flags);
3307 EXPORT_SYMBOL(dev_get_by_index);
3308 EXPORT_SYMBOL(dev_get_by_name);
3309 EXPORT_SYMBOL(dev_open);
3310 EXPORT_SYMBOL(dev_queue_xmit);
3311 EXPORT_SYMBOL(dev_remove_pack);
3312 EXPORT_SYMBOL(dev_set_allmulti);
3313 EXPORT_SYMBOL(dev_set_promiscuity);
3314 EXPORT_SYMBOL(dev_change_flags);
3315 EXPORT_SYMBOL(dev_set_mtu);
3316 EXPORT_SYMBOL(dev_set_mac_address);
3317 EXPORT_SYMBOL(free_netdev);
3318 EXPORT_SYMBOL(netdev_boot_setup_check);
3319 EXPORT_SYMBOL(netdev_set_master);
3320 EXPORT_SYMBOL(netdev_state_change);
3321 EXPORT_SYMBOL(netif_receive_skb);
3322 EXPORT_SYMBOL(netif_rx);
3323 EXPORT_SYMBOL(register_gifconf);
3324 EXPORT_SYMBOL(register_netdevice);
3325 EXPORT_SYMBOL(register_netdevice_notifier);
3326 EXPORT_SYMBOL(skb_checksum_help);
3327 EXPORT_SYMBOL(synchronize_net);
3328 EXPORT_SYMBOL(unregister_netdevice);
3329 EXPORT_SYMBOL(unregister_netdevice_notifier);
3330 EXPORT_SYMBOL(net_enable_timestamp);
3331 EXPORT_SYMBOL(net_disable_timestamp);
3332 EXPORT_SYMBOL(dev_get_flags);
3334 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
3335 EXPORT_SYMBOL(br_handle_frame_hook);
3336 EXPORT_SYMBOL(br_fdb_get_hook);
3337 EXPORT_SYMBOL(br_fdb_put_hook);
3341 EXPORT_SYMBOL(dev_load);
3344 EXPORT_PER_CPU_SYMBOL(softnet_data);