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/mutex.h>
85 #include <linux/string.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/errno.h>
90 #include <linux/interrupt.h>
91 #include <linux/if_ether.h>
92 #include <linux/netdevice.h>
93 #include <linux/etherdevice.h>
94 #include <linux/notifier.h>
95 #include <linux/skbuff.h>
97 #include <linux/rtnetlink.h>
98 #include <linux/proc_fs.h>
99 #include <linux/seq_file.h>
100 #include <linux/stat.h>
101 #include <linux/if_bridge.h>
102 #include <linux/divert.h>
104 #include <net/pkt_sched.h>
105 #include <net/checksum.h>
106 #include <linux/highmem.h>
107 #include <linux/init.h>
108 #include <linux/kmod.h>
109 #include <linux/module.h>
110 #include <linux/kallsyms.h>
111 #include <linux/netpoll.h>
112 #include <linux/rcupdate.h>
113 #include <linux/delay.h>
114 #include <linux/wireless.h>
115 #include <net/iw_handler.h>
116 #include <asm/current.h>
119 * The list of packet types we will receive (as opposed to discard)
120 * and the routines to invoke.
122 * Why 16. Because with 16 the only overlap we get on a hash of the
123 * low nibble of the protocol value is RARP/SNAP/X.25.
125 * NOTE: That is no longer true with the addition of VLAN tags. Not
126 * sure which should go first, but I bet it won't make much
127 * difference if we are running VLANs. The good news is that
128 * this protocol won't be in the list unless compiled in, so
129 * the average user (w/out VLANs) will not be adversly affected.
146 static DEFINE_SPINLOCK(ptype_lock);
147 static struct list_head ptype_base[16]; /* 16 way hashed list */
148 static struct list_head ptype_all; /* Taps */
151 * The @dev_base list is protected by @dev_base_lock and the rtln
154 * Pure readers hold dev_base_lock for reading.
156 * Writers must hold the rtnl semaphore while they loop through the
157 * dev_base list, and hold dev_base_lock for writing when they do the
158 * actual updates. This allows pure readers to access the list even
159 * while a writer is preparing to update it.
161 * To put it another way, dev_base_lock is held for writing only to
162 * protect against pure readers; the rtnl semaphore provides the
163 * protection against other writers.
165 * See, for example usages, register_netdevice() and
166 * unregister_netdevice(), which must be called with the rtnl
169 struct net_device *dev_base;
170 static struct net_device **dev_tail = &dev_base;
171 DEFINE_RWLOCK(dev_base_lock);
173 EXPORT_SYMBOL(dev_base);
174 EXPORT_SYMBOL(dev_base_lock);
176 #define NETDEV_HASHBITS 8
177 static struct hlist_head dev_name_head[1<<NETDEV_HASHBITS];
178 static struct hlist_head dev_index_head[1<<NETDEV_HASHBITS];
180 static inline struct hlist_head *dev_name_hash(const char *name)
182 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
183 return &dev_name_head[hash & ((1<<NETDEV_HASHBITS)-1)];
186 static inline struct hlist_head *dev_index_hash(int ifindex)
188 return &dev_index_head[ifindex & ((1<<NETDEV_HASHBITS)-1)];
195 static struct notifier_block *netdev_chain;
198 * Device drivers call our routines to queue packets here. We empty the
199 * queue in the local softnet handler.
201 DEFINE_PER_CPU(struct softnet_data, softnet_data) = { NULL };
204 extern int netdev_sysfs_init(void);
205 extern int netdev_register_sysfs(struct net_device *);
206 extern void netdev_unregister_sysfs(struct net_device *);
208 #define netdev_sysfs_init() (0)
209 #define netdev_register_sysfs(dev) (0)
210 #define netdev_unregister_sysfs(dev) do { } while(0)
214 /*******************************************************************************
216 Protocol management and registration routines
218 *******************************************************************************/
227 * Add a protocol ID to the list. Now that the input handler is
228 * smarter we can dispense with all the messy stuff that used to be
231 * BEWARE!!! Protocol handlers, mangling input packets,
232 * MUST BE last in hash buckets and checking protocol handlers
233 * MUST start from promiscuous ptype_all chain in net_bh.
234 * It is true now, do not change it.
235 * Explanation follows: if protocol handler, mangling packet, will
236 * be the first on list, it is not able to sense, that packet
237 * is cloned and should be copied-on-write, so that it will
238 * change it and subsequent readers will get broken packet.
243 * dev_add_pack - add packet handler
244 * @pt: packet type declaration
246 * Add a protocol handler to the networking stack. The passed &packet_type
247 * is linked into kernel lists and may not be freed until it has been
248 * removed from the kernel lists.
250 * This call does not sleep therefore it can not
251 * guarantee all CPU's that are in middle of receiving packets
252 * will see the new packet type (until the next received packet).
255 void dev_add_pack(struct packet_type *pt)
259 spin_lock_bh(&ptype_lock);
260 if (pt->type == htons(ETH_P_ALL)) {
262 list_add_rcu(&pt->list, &ptype_all);
264 hash = ntohs(pt->type) & 15;
265 list_add_rcu(&pt->list, &ptype_base[hash]);
267 spin_unlock_bh(&ptype_lock);
271 * __dev_remove_pack - remove packet handler
272 * @pt: packet type declaration
274 * Remove a protocol handler that was previously added to the kernel
275 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
276 * from the kernel lists and can be freed or reused once this function
279 * The packet type might still be in use by receivers
280 * and must not be freed until after all the CPU's have gone
281 * through a quiescent state.
283 void __dev_remove_pack(struct packet_type *pt)
285 struct list_head *head;
286 struct packet_type *pt1;
288 spin_lock_bh(&ptype_lock);
290 if (pt->type == htons(ETH_P_ALL)) {
294 head = &ptype_base[ntohs(pt->type) & 15];
296 list_for_each_entry(pt1, head, list) {
298 list_del_rcu(&pt->list);
303 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
305 spin_unlock_bh(&ptype_lock);
308 * dev_remove_pack - remove packet handler
309 * @pt: packet type declaration
311 * Remove a protocol handler that was previously added to the kernel
312 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
313 * from the kernel lists and can be freed or reused once this function
316 * This call sleeps to guarantee that no CPU is looking at the packet
319 void dev_remove_pack(struct packet_type *pt)
321 __dev_remove_pack(pt);
326 /******************************************************************************
328 Device Boot-time Settings Routines
330 *******************************************************************************/
332 /* Boot time configuration table */
333 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
336 * netdev_boot_setup_add - add new setup entry
337 * @name: name of the device
338 * @map: configured settings for the device
340 * Adds new setup entry to the dev_boot_setup list. The function
341 * returns 0 on error and 1 on success. This is a generic routine to
344 static int netdev_boot_setup_add(char *name, struct ifmap *map)
346 struct netdev_boot_setup *s;
350 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
351 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
352 memset(s[i].name, 0, sizeof(s[i].name));
353 strcpy(s[i].name, name);
354 memcpy(&s[i].map, map, sizeof(s[i].map));
359 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
363 * netdev_boot_setup_check - check boot time settings
364 * @dev: the netdevice
366 * Check boot time settings for the device.
367 * The found settings are set for the device to be used
368 * later in the device probing.
369 * Returns 0 if no settings found, 1 if they are.
371 int netdev_boot_setup_check(struct net_device *dev)
373 struct netdev_boot_setup *s = dev_boot_setup;
376 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
377 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
378 !strncmp(dev->name, s[i].name, strlen(s[i].name))) {
379 dev->irq = s[i].map.irq;
380 dev->base_addr = s[i].map.base_addr;
381 dev->mem_start = s[i].map.mem_start;
382 dev->mem_end = s[i].map.mem_end;
391 * netdev_boot_base - get address from boot time settings
392 * @prefix: prefix for network device
393 * @unit: id for network device
395 * Check boot time settings for the base address of device.
396 * The found settings are set for the device to be used
397 * later in the device probing.
398 * Returns 0 if no settings found.
400 unsigned long netdev_boot_base(const char *prefix, int unit)
402 const struct netdev_boot_setup *s = dev_boot_setup;
406 sprintf(name, "%s%d", prefix, unit);
409 * If device already registered then return base of 1
410 * to indicate not to probe for this interface
412 if (__dev_get_by_name(name))
415 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
416 if (!strcmp(name, s[i].name))
417 return s[i].map.base_addr;
422 * Saves at boot time configured settings for any netdevice.
424 int __init netdev_boot_setup(char *str)
429 str = get_options(str, ARRAY_SIZE(ints), ints);
434 memset(&map, 0, sizeof(map));
438 map.base_addr = ints[2];
440 map.mem_start = ints[3];
442 map.mem_end = ints[4];
444 /* Add new entry to the list */
445 return netdev_boot_setup_add(str, &map);
448 __setup("netdev=", netdev_boot_setup);
450 /*******************************************************************************
452 Device Interface Subroutines
454 *******************************************************************************/
457 * __dev_get_by_name - find a device by its name
458 * @name: name to find
460 * Find an interface by name. Must be called under RTNL semaphore
461 * or @dev_base_lock. If the name is found a pointer to the device
462 * is returned. If the name is not found then %NULL is returned. The
463 * reference counters are not incremented so the caller must be
464 * careful with locks.
467 struct net_device *__dev_get_by_name(const char *name)
469 struct hlist_node *p;
471 hlist_for_each(p, dev_name_hash(name)) {
472 struct net_device *dev
473 = hlist_entry(p, struct net_device, name_hlist);
474 if (!strncmp(dev->name, name, IFNAMSIZ))
481 * dev_get_by_name - find a device by its name
482 * @name: name to find
484 * Find an interface by name. This can be called from any
485 * context and does its own locking. The returned handle has
486 * the usage count incremented and the caller must use dev_put() to
487 * release it when it is no longer needed. %NULL is returned if no
488 * matching device is found.
491 struct net_device *dev_get_by_name(const char *name)
493 struct net_device *dev;
495 read_lock(&dev_base_lock);
496 dev = __dev_get_by_name(name);
499 read_unlock(&dev_base_lock);
504 * __dev_get_by_index - find a device by its ifindex
505 * @ifindex: index of device
507 * Search for an interface by index. Returns %NULL if the device
508 * is not found or a pointer to the device. The device has not
509 * had its reference counter increased so the caller must be careful
510 * about locking. The caller must hold either the RTNL semaphore
514 struct net_device *__dev_get_by_index(int ifindex)
516 struct hlist_node *p;
518 hlist_for_each(p, dev_index_hash(ifindex)) {
519 struct net_device *dev
520 = hlist_entry(p, struct net_device, index_hlist);
521 if (dev->ifindex == ifindex)
529 * dev_get_by_index - find a device by its ifindex
530 * @ifindex: index of device
532 * Search for an interface by index. Returns NULL if the device
533 * is not found or a pointer to the device. The device returned has
534 * had a reference added and the pointer is safe until the user calls
535 * dev_put to indicate they have finished with it.
538 struct net_device *dev_get_by_index(int ifindex)
540 struct net_device *dev;
542 read_lock(&dev_base_lock);
543 dev = __dev_get_by_index(ifindex);
546 read_unlock(&dev_base_lock);
551 * dev_getbyhwaddr - find a device by its hardware address
552 * @type: media type of device
553 * @ha: hardware address
555 * Search for an interface by MAC address. Returns NULL if the device
556 * is not found or a pointer to the device. The caller must hold the
557 * rtnl semaphore. The returned device has not had its ref count increased
558 * and the caller must therefore be careful about locking
561 * If the API was consistent this would be __dev_get_by_hwaddr
564 struct net_device *dev_getbyhwaddr(unsigned short type, char *ha)
566 struct net_device *dev;
570 for (dev = dev_base; dev; dev = dev->next)
571 if (dev->type == type &&
572 !memcmp(dev->dev_addr, ha, dev->addr_len))
577 EXPORT_SYMBOL(dev_getbyhwaddr);
579 struct net_device *dev_getfirstbyhwtype(unsigned short type)
581 struct net_device *dev;
584 for (dev = dev_base; dev; dev = dev->next) {
585 if (dev->type == type) {
594 EXPORT_SYMBOL(dev_getfirstbyhwtype);
597 * dev_get_by_flags - find any device with given flags
598 * @if_flags: IFF_* values
599 * @mask: bitmask of bits in if_flags to check
601 * Search for any interface with the given flags. Returns NULL if a device
602 * is not found or a pointer to the device. The device returned has
603 * had a reference added and the pointer is safe until the user calls
604 * dev_put to indicate they have finished with it.
607 struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mask)
609 struct net_device *dev;
611 read_lock(&dev_base_lock);
612 for (dev = dev_base; dev != NULL; dev = dev->next) {
613 if (((dev->flags ^ if_flags) & mask) == 0) {
618 read_unlock(&dev_base_lock);
623 * dev_valid_name - check if name is okay for network device
626 * Network device names need to be valid file names to
627 * to allow sysfs to work
629 int dev_valid_name(const char *name)
631 return !(*name == '\0'
632 || !strcmp(name, ".")
633 || !strcmp(name, "..")
634 || strchr(name, '/'));
638 * dev_alloc_name - allocate a name for a device
640 * @name: name format string
642 * Passed a format string - eg "lt%d" it will try and find a suitable
643 * id. Not efficient for many devices, not called a lot. The caller
644 * must hold the dev_base or rtnl lock while allocating the name and
645 * adding the device in order to avoid duplicates. Returns the number
646 * of the unit assigned or a negative errno code.
649 int dev_alloc_name(struct net_device *dev, const char *name)
654 const int max_netdevices = 8*PAGE_SIZE;
656 struct net_device *d;
658 p = strnchr(name, IFNAMSIZ-1, '%');
661 * Verify the string as this thing may have come from
662 * the user. There must be either one "%d" and no other "%"
665 if (p[1] != 'd' || strchr(p + 2, '%'))
668 /* Use one page as a bit array of possible slots */
669 inuse = (long *) get_zeroed_page(GFP_ATOMIC);
673 for (d = dev_base; d; d = d->next) {
674 if (!sscanf(d->name, name, &i))
676 if (i < 0 || i >= max_netdevices)
679 /* avoid cases where sscanf is not exact inverse of printf */
680 snprintf(buf, sizeof(buf), name, i);
681 if (!strncmp(buf, d->name, IFNAMSIZ))
685 i = find_first_zero_bit(inuse, max_netdevices);
686 free_page((unsigned long) inuse);
689 snprintf(buf, sizeof(buf), name, i);
690 if (!__dev_get_by_name(buf)) {
691 strlcpy(dev->name, buf, IFNAMSIZ);
695 /* It is possible to run out of possible slots
696 * when the name is long and there isn't enough space left
697 * for the digits, or if all bits are used.
704 * dev_change_name - change name of a device
706 * @newname: name (or format string) must be at least IFNAMSIZ
708 * Change name of a device, can pass format strings "eth%d".
711 int dev_change_name(struct net_device *dev, char *newname)
717 if (dev->flags & IFF_UP)
720 if (!dev_valid_name(newname))
723 if (strchr(newname, '%')) {
724 err = dev_alloc_name(dev, newname);
727 strcpy(newname, dev->name);
729 else if (__dev_get_by_name(newname))
732 strlcpy(dev->name, newname, IFNAMSIZ);
734 err = class_device_rename(&dev->class_dev, dev->name);
736 hlist_del(&dev->name_hlist);
737 hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name));
738 notifier_call_chain(&netdev_chain, NETDEV_CHANGENAME, dev);
745 * netdev_features_change - device changes fatures
746 * @dev: device to cause notification
748 * Called to indicate a device has changed features.
750 void netdev_features_change(struct net_device *dev)
752 notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
754 EXPORT_SYMBOL(netdev_features_change);
757 * netdev_state_change - device changes state
758 * @dev: device to cause notification
760 * Called to indicate a device has changed state. This function calls
761 * the notifier chains for netdev_chain and sends a NEWLINK message
762 * to the routing socket.
764 void netdev_state_change(struct net_device *dev)
766 if (dev->flags & IFF_UP) {
767 notifier_call_chain(&netdev_chain, NETDEV_CHANGE, dev);
768 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
773 * dev_load - load a network module
774 * @name: name of interface
776 * If a network interface is not present and the process has suitable
777 * privileges this function loads the module. If module loading is not
778 * available in this kernel then it becomes a nop.
781 void dev_load(const char *name)
783 struct net_device *dev;
785 read_lock(&dev_base_lock);
786 dev = __dev_get_by_name(name);
787 read_unlock(&dev_base_lock);
789 if (!dev && capable(CAP_SYS_MODULE))
790 request_module("%s", name);
793 static int default_rebuild_header(struct sk_buff *skb)
795 printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
796 skb->dev ? skb->dev->name : "NULL!!!");
803 * dev_open - prepare an interface for use.
804 * @dev: device to open
806 * Takes a device from down to up state. The device's private open
807 * function is invoked and then the multicast lists are loaded. Finally
808 * the device is moved into the up state and a %NETDEV_UP message is
809 * sent to the netdev notifier chain.
811 * Calling this function on an active interface is a nop. On a failure
812 * a negative errno code is returned.
814 int dev_open(struct net_device *dev)
822 if (dev->flags & IFF_UP)
826 * Is it even present?
828 if (!netif_device_present(dev))
832 * Call device private open method
834 set_bit(__LINK_STATE_START, &dev->state);
836 ret = dev->open(dev);
838 clear_bit(__LINK_STATE_START, &dev->state);
842 * If it went open OK then:
849 dev->flags |= IFF_UP;
852 * Initialize multicasting status
857 * Wakeup transmit queue engine
862 * ... and announce new interface.
864 notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
870 * dev_close - shutdown an interface.
871 * @dev: device to shutdown
873 * This function moves an active device into down state. A
874 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
875 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
878 int dev_close(struct net_device *dev)
880 if (!(dev->flags & IFF_UP))
884 * Tell people we are going down, so that they can
885 * prepare to death, when device is still operating.
887 notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
891 clear_bit(__LINK_STATE_START, &dev->state);
893 /* Synchronize to scheduled poll. We cannot touch poll list,
894 * it can be even on different cpu. So just clear netif_running(),
895 * and wait when poll really will happen. Actually, the best place
896 * for this is inside dev->stop() after device stopped its irq
897 * engine, but this requires more changes in devices. */
899 smp_mb__after_clear_bit(); /* Commit netif_running(). */
900 while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
906 * Call the device specific close. This cannot fail.
907 * Only if device is UP
909 * We allow it to be called even after a DETACH hot-plug
916 * Device is now down.
919 dev->flags &= ~IFF_UP;
922 * Tell people we are down
924 notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
931 * Device change register/unregister. These are not inline or static
932 * as we export them to the world.
936 * register_netdevice_notifier - register a network notifier block
939 * Register a notifier to be called when network device events occur.
940 * The notifier passed is linked into the kernel structures and must
941 * not be reused until it has been unregistered. A negative errno code
942 * is returned on a failure.
944 * When registered all registration and up events are replayed
945 * to the new notifier to allow device to have a race free
946 * view of the network device list.
949 int register_netdevice_notifier(struct notifier_block *nb)
951 struct net_device *dev;
955 err = notifier_chain_register(&netdev_chain, nb);
957 for (dev = dev_base; dev; dev = dev->next) {
958 nb->notifier_call(nb, NETDEV_REGISTER, dev);
960 if (dev->flags & IFF_UP)
961 nb->notifier_call(nb, NETDEV_UP, dev);
969 * unregister_netdevice_notifier - unregister a network notifier block
972 * Unregister a notifier previously registered by
973 * register_netdevice_notifier(). The notifier is unlinked into the
974 * kernel structures and may then be reused. A negative errno code
975 * is returned on a failure.
978 int unregister_netdevice_notifier(struct notifier_block *nb)
983 err = notifier_chain_unregister(&netdev_chain, nb);
989 * call_netdevice_notifiers - call all network notifier blocks
990 * @val: value passed unmodified to notifier function
991 * @v: pointer passed unmodified to notifier function
993 * Call all network notifier blocks. Parameters and return value
994 * are as for notifier_call_chain().
997 int call_netdevice_notifiers(unsigned long val, void *v)
999 return notifier_call_chain(&netdev_chain, val, v);
1002 /* When > 0 there are consumers of rx skb time stamps */
1003 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1005 void net_enable_timestamp(void)
1007 atomic_inc(&netstamp_needed);
1010 void net_disable_timestamp(void)
1012 atomic_dec(&netstamp_needed);
1015 void __net_timestamp(struct sk_buff *skb)
1019 do_gettimeofday(&tv);
1020 skb_set_timestamp(skb, &tv);
1022 EXPORT_SYMBOL(__net_timestamp);
1024 static inline void net_timestamp(struct sk_buff *skb)
1026 if (atomic_read(&netstamp_needed))
1027 __net_timestamp(skb);
1029 skb->tstamp.off_sec = 0;
1030 skb->tstamp.off_usec = 0;
1035 * Support routine. Sends outgoing frames to any network
1036 * taps currently in use.
1039 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1041 struct packet_type *ptype;
1046 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1047 /* Never send packets back to the socket
1048 * they originated from - MvS (miquels@drinkel.ow.org)
1050 if ((ptype->dev == dev || !ptype->dev) &&
1051 (ptype->af_packet_priv == NULL ||
1052 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1053 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1057 /* skb->nh should be correctly
1058 set by sender, so that the second statement is
1059 just protection against buggy protocols.
1061 skb2->mac.raw = skb2->data;
1063 if (skb2->nh.raw < skb2->data ||
1064 skb2->nh.raw > skb2->tail) {
1065 if (net_ratelimit())
1066 printk(KERN_CRIT "protocol %04x is "
1068 skb2->protocol, dev->name);
1069 skb2->nh.raw = skb2->data;
1072 skb2->h.raw = skb2->nh.raw;
1073 skb2->pkt_type = PACKET_OUTGOING;
1074 ptype->func(skb2, skb->dev, ptype, skb->dev);
1081 * Invalidate hardware checksum when packet is to be mangled, and
1082 * complete checksum manually on outgoing path.
1084 int skb_checksum_help(struct sk_buff *skb, int inward)
1087 int ret = 0, offset = skb->h.raw - skb->data;
1090 skb->ip_summed = CHECKSUM_NONE;
1094 if (skb_cloned(skb)) {
1095 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1100 BUG_ON(offset > (int)skb->len);
1101 csum = skb_checksum(skb, offset, skb->len-offset, 0);
1103 offset = skb->tail - skb->h.raw;
1104 BUG_ON(offset <= 0);
1105 BUG_ON(skb->csum + 2 > offset);
1107 *(u16*)(skb->h.raw + skb->csum) = csum_fold(csum);
1108 skb->ip_summed = CHECKSUM_NONE;
1113 /* Take action when hardware reception checksum errors are detected. */
1115 void netdev_rx_csum_fault(struct net_device *dev)
1117 if (net_ratelimit()) {
1118 printk(KERN_ERR "%s: hw csum failure.\n",
1119 dev ? dev->name : "<unknown>");
1123 EXPORT_SYMBOL(netdev_rx_csum_fault);
1126 #ifdef CONFIG_HIGHMEM
1127 /* Actually, we should eliminate this check as soon as we know, that:
1128 * 1. IOMMU is present and allows to map all the memory.
1129 * 2. No high memory really exists on this machine.
1132 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1136 if (dev->features & NETIF_F_HIGHDMA)
1139 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1140 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1146 #define illegal_highdma(dev, skb) (0)
1149 /* Keep head the same: replace data */
1150 int __skb_linearize(struct sk_buff *skb, gfp_t gfp_mask)
1155 struct skb_shared_info *ninfo;
1156 int headerlen = skb->data - skb->head;
1157 int expand = (skb->tail + skb->data_len) - skb->end;
1159 if (skb_shared(skb))
1165 size = skb->end - skb->head + expand;
1166 size = SKB_DATA_ALIGN(size);
1167 data = kmalloc(size + sizeof(struct skb_shared_info), gfp_mask);
1171 /* Copy entire thing */
1172 if (skb_copy_bits(skb, -headerlen, data, headerlen + skb->len))
1176 ninfo = (struct skb_shared_info*)(data + size);
1177 atomic_set(&ninfo->dataref, 1);
1178 ninfo->tso_size = skb_shinfo(skb)->tso_size;
1179 ninfo->tso_segs = skb_shinfo(skb)->tso_segs;
1180 ninfo->nr_frags = 0;
1181 ninfo->frag_list = NULL;
1183 /* Offset between the two in bytes */
1184 offset = data - skb->head;
1186 /* Free old data. */
1187 skb_release_data(skb);
1190 skb->end = data + size;
1192 /* Set up new pointers */
1193 skb->h.raw += offset;
1194 skb->nh.raw += offset;
1195 skb->mac.raw += offset;
1196 skb->tail += offset;
1197 skb->data += offset;
1199 /* We are no longer a clone, even if we were. */
1202 skb->tail += skb->data_len;
1207 #define HARD_TX_LOCK(dev, cpu) { \
1208 if ((dev->features & NETIF_F_LLTX) == 0) { \
1209 spin_lock(&dev->xmit_lock); \
1210 dev->xmit_lock_owner = cpu; \
1214 #define HARD_TX_UNLOCK(dev) { \
1215 if ((dev->features & NETIF_F_LLTX) == 0) { \
1216 dev->xmit_lock_owner = -1; \
1217 spin_unlock(&dev->xmit_lock); \
1222 * dev_queue_xmit - transmit a buffer
1223 * @skb: buffer to transmit
1225 * Queue a buffer for transmission to a network device. The caller must
1226 * have set the device and priority and built the buffer before calling
1227 * this function. The function can be called from an interrupt.
1229 * A negative errno code is returned on a failure. A success does not
1230 * guarantee the frame will be transmitted as it may be dropped due
1231 * to congestion or traffic shaping.
1233 * -----------------------------------------------------------------------------------
1234 * I notice this method can also return errors from the queue disciplines,
1235 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1238 * Regardless of the return value, the skb is consumed, so it is currently
1239 * difficult to retry a send to this method. (You can bump the ref count
1240 * before sending to hold a reference for retry if you are careful.)
1242 * When calling this method, interrupts MUST be enabled. This is because
1243 * the BH enable code must have IRQs enabled so that it will not deadlock.
1247 int dev_queue_xmit(struct sk_buff *skb)
1249 struct net_device *dev = skb->dev;
1253 if (skb_shinfo(skb)->frag_list &&
1254 !(dev->features & NETIF_F_FRAGLIST) &&
1255 __skb_linearize(skb, GFP_ATOMIC))
1258 /* Fragmented skb is linearized if device does not support SG,
1259 * or if at least one of fragments is in highmem and device
1260 * does not support DMA from it.
1262 if (skb_shinfo(skb)->nr_frags &&
1263 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1264 __skb_linearize(skb, GFP_ATOMIC))
1267 /* If packet is not checksummed and device does not support
1268 * checksumming for this protocol, complete checksumming here.
1270 if (skb->ip_summed == CHECKSUM_HW &&
1271 (!(dev->features & (NETIF_F_HW_CSUM | NETIF_F_NO_CSUM)) &&
1272 (!(dev->features & NETIF_F_IP_CSUM) ||
1273 skb->protocol != htons(ETH_P_IP))))
1274 if (skb_checksum_help(skb, 0))
1277 spin_lock_prefetch(&dev->queue_lock);
1279 /* Disable soft irqs for various locks below. Also
1280 * stops preemption for RCU.
1284 /* Updates of qdisc are serialized by queue_lock.
1285 * The struct Qdisc which is pointed to by qdisc is now a
1286 * rcu structure - it may be accessed without acquiring
1287 * a lock (but the structure may be stale.) The freeing of the
1288 * qdisc will be deferred until it's known that there are no
1289 * more references to it.
1291 * If the qdisc has an enqueue function, we still need to
1292 * hold the queue_lock before calling it, since queue_lock
1293 * also serializes access to the device queue.
1296 q = rcu_dereference(dev->qdisc);
1297 #ifdef CONFIG_NET_CLS_ACT
1298 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1301 /* Grab device queue */
1302 spin_lock(&dev->queue_lock);
1304 rc = q->enqueue(skb, q);
1308 spin_unlock(&dev->queue_lock);
1309 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1313 /* The device has no queue. Common case for software devices:
1314 loopback, all the sorts of tunnels...
1316 Really, it is unlikely that xmit_lock protection is necessary here.
1317 (f.e. loopback and IP tunnels are clean ignoring statistics
1319 However, it is possible, that they rely on protection
1322 Check this and shot the lock. It is not prone from deadlocks.
1323 Either shot noqueue qdisc, it is even simpler 8)
1325 if (dev->flags & IFF_UP) {
1326 int cpu = smp_processor_id(); /* ok because BHs are off */
1328 if (dev->xmit_lock_owner != cpu) {
1330 HARD_TX_LOCK(dev, cpu);
1332 if (!netif_queue_stopped(dev)) {
1334 dev_queue_xmit_nit(skb, dev);
1337 if (!dev->hard_start_xmit(skb, dev)) {
1338 HARD_TX_UNLOCK(dev);
1342 HARD_TX_UNLOCK(dev);
1343 if (net_ratelimit())
1344 printk(KERN_CRIT "Virtual device %s asks to "
1345 "queue packet!\n", dev->name);
1347 /* Recursion is detected! It is possible,
1349 if (net_ratelimit())
1350 printk(KERN_CRIT "Dead loop on virtual device "
1351 "%s, fix it urgently!\n", dev->name);
1367 /*=======================================================================
1369 =======================================================================*/
1371 int netdev_max_backlog = 1000;
1372 int netdev_budget = 300;
1373 int weight_p = 64; /* old backlog weight */
1375 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1379 * netif_rx - post buffer to the network code
1380 * @skb: buffer to post
1382 * This function receives a packet from a device driver and queues it for
1383 * the upper (protocol) levels to process. It always succeeds. The buffer
1384 * may be dropped during processing for congestion control or by the
1388 * NET_RX_SUCCESS (no congestion)
1389 * NET_RX_CN_LOW (low congestion)
1390 * NET_RX_CN_MOD (moderate congestion)
1391 * NET_RX_CN_HIGH (high congestion)
1392 * NET_RX_DROP (packet was dropped)
1396 int netif_rx(struct sk_buff *skb)
1398 struct softnet_data *queue;
1399 unsigned long flags;
1401 /* if netpoll wants it, pretend we never saw it */
1402 if (netpoll_rx(skb))
1405 if (!skb->tstamp.off_sec)
1409 * The code is rearranged so that the path is the most
1410 * short when CPU is congested, but is still operating.
1412 local_irq_save(flags);
1413 queue = &__get_cpu_var(softnet_data);
1415 __get_cpu_var(netdev_rx_stat).total++;
1416 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1417 if (queue->input_pkt_queue.qlen) {
1420 __skb_queue_tail(&queue->input_pkt_queue, skb);
1421 local_irq_restore(flags);
1422 return NET_RX_SUCCESS;
1425 netif_rx_schedule(&queue->backlog_dev);
1429 __get_cpu_var(netdev_rx_stat).dropped++;
1430 local_irq_restore(flags);
1436 int netif_rx_ni(struct sk_buff *skb)
1441 err = netif_rx(skb);
1442 if (local_softirq_pending())
1449 EXPORT_SYMBOL(netif_rx_ni);
1451 static inline struct net_device *skb_bond(struct sk_buff *skb)
1453 struct net_device *dev = skb->dev;
1457 * On bonding slaves other than the currently active
1458 * slave, suppress duplicates except for 802.3ad
1459 * ETH_P_SLOW and alb non-mcast/bcast.
1461 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
1462 if (dev->master->priv_flags & IFF_MASTER_ALB) {
1463 if (skb->pkt_type != PACKET_BROADCAST &&
1464 skb->pkt_type != PACKET_MULTICAST)
1468 if (dev->master->priv_flags & IFF_MASTER_8023AD &&
1469 skb->protocol == __constant_htons(ETH_P_SLOW))
1476 skb->dev = dev->master;
1482 static void net_tx_action(struct softirq_action *h)
1484 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1486 if (sd->completion_queue) {
1487 struct sk_buff *clist;
1489 local_irq_disable();
1490 clist = sd->completion_queue;
1491 sd->completion_queue = NULL;
1495 struct sk_buff *skb = clist;
1496 clist = clist->next;
1498 BUG_TRAP(!atomic_read(&skb->users));
1503 if (sd->output_queue) {
1504 struct net_device *head;
1506 local_irq_disable();
1507 head = sd->output_queue;
1508 sd->output_queue = NULL;
1512 struct net_device *dev = head;
1513 head = head->next_sched;
1515 smp_mb__before_clear_bit();
1516 clear_bit(__LINK_STATE_SCHED, &dev->state);
1518 if (spin_trylock(&dev->queue_lock)) {
1520 spin_unlock(&dev->queue_lock);
1522 netif_schedule(dev);
1528 static __inline__ int deliver_skb(struct sk_buff *skb,
1529 struct packet_type *pt_prev,
1530 struct net_device *orig_dev)
1532 atomic_inc(&skb->users);
1533 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1536 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1537 int (*br_handle_frame_hook)(struct net_bridge_port *p, struct sk_buff **pskb);
1539 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1540 unsigned char *addr);
1541 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
1543 static __inline__ int handle_bridge(struct sk_buff **pskb,
1544 struct packet_type **pt_prev, int *ret,
1545 struct net_device *orig_dev)
1547 struct net_bridge_port *port;
1549 if ((*pskb)->pkt_type == PACKET_LOOPBACK ||
1550 (port = rcu_dereference((*pskb)->dev->br_port)) == NULL)
1554 *ret = deliver_skb(*pskb, *pt_prev, orig_dev);
1558 return br_handle_frame_hook(port, pskb);
1561 #define handle_bridge(skb, pt_prev, ret, orig_dev) (0)
1564 #ifdef CONFIG_NET_CLS_ACT
1565 /* TODO: Maybe we should just force sch_ingress to be compiled in
1566 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
1567 * a compare and 2 stores extra right now if we dont have it on
1568 * but have CONFIG_NET_CLS_ACT
1569 * NOTE: This doesnt stop any functionality; if you dont have
1570 * the ingress scheduler, you just cant add policies on ingress.
1573 static int ing_filter(struct sk_buff *skb)
1576 struct net_device *dev = skb->dev;
1577 int result = TC_ACT_OK;
1579 if (dev->qdisc_ingress) {
1580 __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
1581 if (MAX_RED_LOOP < ttl++) {
1582 printk("Redir loop detected Dropping packet (%s->%s)\n",
1583 skb->input_dev->name, skb->dev->name);
1587 skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl);
1589 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS);
1591 spin_lock(&dev->ingress_lock);
1592 if ((q = dev->qdisc_ingress) != NULL)
1593 result = q->enqueue(skb, q);
1594 spin_unlock(&dev->ingress_lock);
1602 int netif_receive_skb(struct sk_buff *skb)
1604 struct packet_type *ptype, *pt_prev;
1605 struct net_device *orig_dev;
1606 int ret = NET_RX_DROP;
1607 unsigned short type;
1609 /* if we've gotten here through NAPI, check netpoll */
1610 if (skb->dev->poll && netpoll_rx(skb))
1613 if (!skb->tstamp.off_sec)
1616 if (!skb->input_dev)
1617 skb->input_dev = skb->dev;
1619 orig_dev = skb_bond(skb);
1624 __get_cpu_var(netdev_rx_stat).total++;
1626 skb->h.raw = skb->nh.raw = skb->data;
1627 skb->mac_len = skb->nh.raw - skb->mac.raw;
1633 #ifdef CONFIG_NET_CLS_ACT
1634 if (skb->tc_verd & TC_NCLS) {
1635 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
1640 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1641 if (!ptype->dev || ptype->dev == skb->dev) {
1643 ret = deliver_skb(skb, pt_prev, orig_dev);
1648 #ifdef CONFIG_NET_CLS_ACT
1650 ret = deliver_skb(skb, pt_prev, orig_dev);
1651 pt_prev = NULL; /* noone else should process this after*/
1653 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
1656 ret = ing_filter(skb);
1658 if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
1667 handle_diverter(skb);
1669 if (handle_bridge(&skb, &pt_prev, &ret, orig_dev))
1672 type = skb->protocol;
1673 list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {
1674 if (ptype->type == type &&
1675 (!ptype->dev || ptype->dev == skb->dev)) {
1677 ret = deliver_skb(skb, pt_prev, orig_dev);
1683 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1686 /* Jamal, now you will not able to escape explaining
1687 * me how you were going to use this. :-)
1697 static int process_backlog(struct net_device *backlog_dev, int *budget)
1700 int quota = min(backlog_dev->quota, *budget);
1701 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1702 unsigned long start_time = jiffies;
1704 backlog_dev->weight = weight_p;
1706 struct sk_buff *skb;
1707 struct net_device *dev;
1709 local_irq_disable();
1710 skb = __skb_dequeue(&queue->input_pkt_queue);
1717 netif_receive_skb(skb);
1723 if (work >= quota || jiffies - start_time > 1)
1728 backlog_dev->quota -= work;
1733 backlog_dev->quota -= work;
1736 list_del(&backlog_dev->poll_list);
1737 smp_mb__before_clear_bit();
1738 netif_poll_enable(backlog_dev);
1744 static void net_rx_action(struct softirq_action *h)
1746 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1747 unsigned long start_time = jiffies;
1748 int budget = netdev_budget;
1751 local_irq_disable();
1753 while (!list_empty(&queue->poll_list)) {
1754 struct net_device *dev;
1756 if (budget <= 0 || jiffies - start_time > 1)
1761 dev = list_entry(queue->poll_list.next,
1762 struct net_device, poll_list);
1763 have = netpoll_poll_lock(dev);
1765 if (dev->quota <= 0 || dev->poll(dev, &budget)) {
1766 netpoll_poll_unlock(have);
1767 local_irq_disable();
1768 list_move_tail(&dev->poll_list, &queue->poll_list);
1770 dev->quota += dev->weight;
1772 dev->quota = dev->weight;
1774 netpoll_poll_unlock(have);
1776 local_irq_disable();
1784 __get_cpu_var(netdev_rx_stat).time_squeeze++;
1785 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
1789 static gifconf_func_t * gifconf_list [NPROTO];
1792 * register_gifconf - register a SIOCGIF handler
1793 * @family: Address family
1794 * @gifconf: Function handler
1796 * Register protocol dependent address dumping routines. The handler
1797 * that is passed must not be freed or reused until it has been replaced
1798 * by another handler.
1800 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
1802 if (family >= NPROTO)
1804 gifconf_list[family] = gifconf;
1810 * Map an interface index to its name (SIOCGIFNAME)
1814 * We need this ioctl for efficient implementation of the
1815 * if_indextoname() function required by the IPv6 API. Without
1816 * it, we would have to search all the interfaces to find a
1820 static int dev_ifname(struct ifreq __user *arg)
1822 struct net_device *dev;
1826 * Fetch the caller's info block.
1829 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
1832 read_lock(&dev_base_lock);
1833 dev = __dev_get_by_index(ifr.ifr_ifindex);
1835 read_unlock(&dev_base_lock);
1839 strcpy(ifr.ifr_name, dev->name);
1840 read_unlock(&dev_base_lock);
1842 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
1848 * Perform a SIOCGIFCONF call. This structure will change
1849 * size eventually, and there is nothing I can do about it.
1850 * Thus we will need a 'compatibility mode'.
1853 static int dev_ifconf(char __user *arg)
1856 struct net_device *dev;
1863 * Fetch the caller's info block.
1866 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
1873 * Loop over the interfaces, and write an info block for each.
1877 for (dev = dev_base; dev; dev = dev->next) {
1878 for (i = 0; i < NPROTO; i++) {
1879 if (gifconf_list[i]) {
1882 done = gifconf_list[i](dev, NULL, 0);
1884 done = gifconf_list[i](dev, pos + total,
1894 * All done. Write the updated control block back to the caller.
1896 ifc.ifc_len = total;
1899 * Both BSD and Solaris return 0 here, so we do too.
1901 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
1904 #ifdef CONFIG_PROC_FS
1906 * This is invoked by the /proc filesystem handler to display a device
1909 static __inline__ struct net_device *dev_get_idx(loff_t pos)
1911 struct net_device *dev;
1914 for (i = 0, dev = dev_base; dev && i < pos; ++i, dev = dev->next);
1916 return i == pos ? dev : NULL;
1919 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
1921 read_lock(&dev_base_lock);
1922 return *pos ? dev_get_idx(*pos - 1) : SEQ_START_TOKEN;
1925 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1928 return v == SEQ_START_TOKEN ? dev_base : ((struct net_device *)v)->next;
1931 void dev_seq_stop(struct seq_file *seq, void *v)
1933 read_unlock(&dev_base_lock);
1936 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
1938 if (dev->get_stats) {
1939 struct net_device_stats *stats = dev->get_stats(dev);
1941 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
1942 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
1943 dev->name, stats->rx_bytes, stats->rx_packets,
1945 stats->rx_dropped + stats->rx_missed_errors,
1946 stats->rx_fifo_errors,
1947 stats->rx_length_errors + stats->rx_over_errors +
1948 stats->rx_crc_errors + stats->rx_frame_errors,
1949 stats->rx_compressed, stats->multicast,
1950 stats->tx_bytes, stats->tx_packets,
1951 stats->tx_errors, stats->tx_dropped,
1952 stats->tx_fifo_errors, stats->collisions,
1953 stats->tx_carrier_errors +
1954 stats->tx_aborted_errors +
1955 stats->tx_window_errors +
1956 stats->tx_heartbeat_errors,
1957 stats->tx_compressed);
1959 seq_printf(seq, "%6s: No statistics available.\n", dev->name);
1963 * Called from the PROCfs module. This now uses the new arbitrary sized
1964 * /proc/net interface to create /proc/net/dev
1966 static int dev_seq_show(struct seq_file *seq, void *v)
1968 if (v == SEQ_START_TOKEN)
1969 seq_puts(seq, "Inter-| Receive "
1971 " face |bytes packets errs drop fifo frame "
1972 "compressed multicast|bytes packets errs "
1973 "drop fifo colls carrier compressed\n");
1975 dev_seq_printf_stats(seq, v);
1979 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
1981 struct netif_rx_stats *rc = NULL;
1983 while (*pos < NR_CPUS)
1984 if (cpu_online(*pos)) {
1985 rc = &per_cpu(netdev_rx_stat, *pos);
1992 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
1994 return softnet_get_online(pos);
1997 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2000 return softnet_get_online(pos);
2003 static void softnet_seq_stop(struct seq_file *seq, void *v)
2007 static int softnet_seq_show(struct seq_file *seq, void *v)
2009 struct netif_rx_stats *s = v;
2011 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2012 s->total, s->dropped, s->time_squeeze, 0,
2013 0, 0, 0, 0, /* was fastroute */
2018 static struct seq_operations dev_seq_ops = {
2019 .start = dev_seq_start,
2020 .next = dev_seq_next,
2021 .stop = dev_seq_stop,
2022 .show = dev_seq_show,
2025 static int dev_seq_open(struct inode *inode, struct file *file)
2027 return seq_open(file, &dev_seq_ops);
2030 static struct file_operations dev_seq_fops = {
2031 .owner = THIS_MODULE,
2032 .open = dev_seq_open,
2034 .llseek = seq_lseek,
2035 .release = seq_release,
2038 static struct seq_operations softnet_seq_ops = {
2039 .start = softnet_seq_start,
2040 .next = softnet_seq_next,
2041 .stop = softnet_seq_stop,
2042 .show = softnet_seq_show,
2045 static int softnet_seq_open(struct inode *inode, struct file *file)
2047 return seq_open(file, &softnet_seq_ops);
2050 static struct file_operations softnet_seq_fops = {
2051 .owner = THIS_MODULE,
2052 .open = softnet_seq_open,
2054 .llseek = seq_lseek,
2055 .release = seq_release,
2058 #ifdef CONFIG_WIRELESS_EXT
2059 extern int wireless_proc_init(void);
2061 #define wireless_proc_init() 0
2064 static int __init dev_proc_init(void)
2068 if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops))
2070 if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops))
2072 if (wireless_proc_init())
2078 proc_net_remove("softnet_stat");
2080 proc_net_remove("dev");
2084 #define dev_proc_init() 0
2085 #endif /* CONFIG_PROC_FS */
2089 * netdev_set_master - set up master/slave pair
2090 * @slave: slave device
2091 * @master: new master device
2093 * Changes the master device of the slave. Pass %NULL to break the
2094 * bonding. The caller must hold the RTNL semaphore. On a failure
2095 * a negative errno code is returned. On success the reference counts
2096 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2097 * function returns zero.
2099 int netdev_set_master(struct net_device *slave, struct net_device *master)
2101 struct net_device *old = slave->master;
2111 slave->master = master;
2119 slave->flags |= IFF_SLAVE;
2121 slave->flags &= ~IFF_SLAVE;
2123 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2128 * dev_set_promiscuity - update promiscuity count on a device
2132 * Add or remove promsicuity from a device. While the count in the device
2133 * remains above zero the interface remains promiscuous. Once it hits zero
2134 * the device reverts back to normal filtering operation. A negative inc
2135 * value is used to drop promiscuity on the device.
2137 void dev_set_promiscuity(struct net_device *dev, int inc)
2139 unsigned short old_flags = dev->flags;
2141 if ((dev->promiscuity += inc) == 0)
2142 dev->flags &= ~IFF_PROMISC;
2144 dev->flags |= IFF_PROMISC;
2145 if (dev->flags != old_flags) {
2147 printk(KERN_INFO "device %s %s promiscuous mode\n",
2148 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2154 * dev_set_allmulti - update allmulti count on a device
2158 * Add or remove reception of all multicast frames to a device. While the
2159 * count in the device remains above zero the interface remains listening
2160 * to all interfaces. Once it hits zero the device reverts back to normal
2161 * filtering operation. A negative @inc value is used to drop the counter
2162 * when releasing a resource needing all multicasts.
2165 void dev_set_allmulti(struct net_device *dev, int inc)
2167 unsigned short old_flags = dev->flags;
2169 dev->flags |= IFF_ALLMULTI;
2170 if ((dev->allmulti += inc) == 0)
2171 dev->flags &= ~IFF_ALLMULTI;
2172 if (dev->flags ^ old_flags)
2176 unsigned dev_get_flags(const struct net_device *dev)
2180 flags = (dev->flags & ~(IFF_PROMISC |
2185 (dev->gflags & (IFF_PROMISC |
2188 if (netif_running(dev)) {
2189 if (netif_oper_up(dev))
2190 flags |= IFF_RUNNING;
2191 if (netif_carrier_ok(dev))
2192 flags |= IFF_LOWER_UP;
2193 if (netif_dormant(dev))
2194 flags |= IFF_DORMANT;
2200 int dev_change_flags(struct net_device *dev, unsigned flags)
2203 int old_flags = dev->flags;
2206 * Set the flags on our device.
2209 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
2210 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
2212 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
2216 * Load in the correct multicast list now the flags have changed.
2222 * Have we downed the interface. We handle IFF_UP ourselves
2223 * according to user attempts to set it, rather than blindly
2228 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
2229 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
2235 if (dev->flags & IFF_UP &&
2236 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
2238 notifier_call_chain(&netdev_chain, NETDEV_CHANGE, dev);
2240 if ((flags ^ dev->gflags) & IFF_PROMISC) {
2241 int inc = (flags & IFF_PROMISC) ? +1 : -1;
2242 dev->gflags ^= IFF_PROMISC;
2243 dev_set_promiscuity(dev, inc);
2246 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
2247 is important. Some (broken) drivers set IFF_PROMISC, when
2248 IFF_ALLMULTI is requested not asking us and not reporting.
2250 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
2251 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
2252 dev->gflags ^= IFF_ALLMULTI;
2253 dev_set_allmulti(dev, inc);
2256 if (old_flags ^ dev->flags)
2257 rtmsg_ifinfo(RTM_NEWLINK, dev, old_flags ^ dev->flags);
2262 int dev_set_mtu(struct net_device *dev, int new_mtu)
2266 if (new_mtu == dev->mtu)
2269 /* MTU must be positive. */
2273 if (!netif_device_present(dev))
2277 if (dev->change_mtu)
2278 err = dev->change_mtu(dev, new_mtu);
2281 if (!err && dev->flags & IFF_UP)
2282 notifier_call_chain(&netdev_chain,
2283 NETDEV_CHANGEMTU, dev);
2287 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
2291 if (!dev->set_mac_address)
2293 if (sa->sa_family != dev->type)
2295 if (!netif_device_present(dev))
2297 err = dev->set_mac_address(dev, sa);
2299 notifier_call_chain(&netdev_chain, NETDEV_CHANGEADDR, dev);
2304 * Perform the SIOCxIFxxx calls.
2306 static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
2309 struct net_device *dev = __dev_get_by_name(ifr->ifr_name);
2315 case SIOCGIFFLAGS: /* Get interface flags */
2316 ifr->ifr_flags = dev_get_flags(dev);
2319 case SIOCSIFFLAGS: /* Set interface flags */
2320 return dev_change_flags(dev, ifr->ifr_flags);
2322 case SIOCGIFMETRIC: /* Get the metric on the interface
2323 (currently unused) */
2324 ifr->ifr_metric = 0;
2327 case SIOCSIFMETRIC: /* Set the metric on the interface
2328 (currently unused) */
2331 case SIOCGIFMTU: /* Get the MTU of a device */
2332 ifr->ifr_mtu = dev->mtu;
2335 case SIOCSIFMTU: /* Set the MTU of a device */
2336 return dev_set_mtu(dev, ifr->ifr_mtu);
2340 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
2342 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
2343 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2344 ifr->ifr_hwaddr.sa_family = dev->type;
2348 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
2350 case SIOCSIFHWBROADCAST:
2351 if (ifr->ifr_hwaddr.sa_family != dev->type)
2353 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
2354 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2355 notifier_call_chain(&netdev_chain,
2356 NETDEV_CHANGEADDR, dev);
2360 ifr->ifr_map.mem_start = dev->mem_start;
2361 ifr->ifr_map.mem_end = dev->mem_end;
2362 ifr->ifr_map.base_addr = dev->base_addr;
2363 ifr->ifr_map.irq = dev->irq;
2364 ifr->ifr_map.dma = dev->dma;
2365 ifr->ifr_map.port = dev->if_port;
2369 if (dev->set_config) {
2370 if (!netif_device_present(dev))
2372 return dev->set_config(dev, &ifr->ifr_map);
2377 if (!dev->set_multicast_list ||
2378 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2380 if (!netif_device_present(dev))
2382 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
2386 if (!dev->set_multicast_list ||
2387 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2389 if (!netif_device_present(dev))
2391 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
2395 ifr->ifr_ifindex = dev->ifindex;
2399 ifr->ifr_qlen = dev->tx_queue_len;
2403 if (ifr->ifr_qlen < 0)
2405 dev->tx_queue_len = ifr->ifr_qlen;
2409 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
2410 return dev_change_name(dev, ifr->ifr_newname);
2413 * Unknown or private ioctl
2417 if ((cmd >= SIOCDEVPRIVATE &&
2418 cmd <= SIOCDEVPRIVATE + 15) ||
2419 cmd == SIOCBONDENSLAVE ||
2420 cmd == SIOCBONDRELEASE ||
2421 cmd == SIOCBONDSETHWADDR ||
2422 cmd == SIOCBONDSLAVEINFOQUERY ||
2423 cmd == SIOCBONDINFOQUERY ||
2424 cmd == SIOCBONDCHANGEACTIVE ||
2425 cmd == SIOCGMIIPHY ||
2426 cmd == SIOCGMIIREG ||
2427 cmd == SIOCSMIIREG ||
2428 cmd == SIOCBRADDIF ||
2429 cmd == SIOCBRDELIF ||
2430 cmd == SIOCWANDEV) {
2432 if (dev->do_ioctl) {
2433 if (netif_device_present(dev))
2434 err = dev->do_ioctl(dev, ifr,
2447 * This function handles all "interface"-type I/O control requests. The actual
2448 * 'doing' part of this is dev_ifsioc above.
2452 * dev_ioctl - network device ioctl
2453 * @cmd: command to issue
2454 * @arg: pointer to a struct ifreq in user space
2456 * Issue ioctl functions to devices. This is normally called by the
2457 * user space syscall interfaces but can sometimes be useful for
2458 * other purposes. The return value is the return from the syscall if
2459 * positive or a negative errno code on error.
2462 int dev_ioctl(unsigned int cmd, void __user *arg)
2468 /* One special case: SIOCGIFCONF takes ifconf argument
2469 and requires shared lock, because it sleeps writing
2473 if (cmd == SIOCGIFCONF) {
2475 ret = dev_ifconf((char __user *) arg);
2479 if (cmd == SIOCGIFNAME)
2480 return dev_ifname((struct ifreq __user *)arg);
2482 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2485 ifr.ifr_name[IFNAMSIZ-1] = 0;
2487 colon = strchr(ifr.ifr_name, ':');
2492 * See which interface the caller is talking about.
2497 * These ioctl calls:
2498 * - can be done by all.
2499 * - atomic and do not require locking.
2510 dev_load(ifr.ifr_name);
2511 read_lock(&dev_base_lock);
2512 ret = dev_ifsioc(&ifr, cmd);
2513 read_unlock(&dev_base_lock);
2517 if (copy_to_user(arg, &ifr,
2518 sizeof(struct ifreq)))
2524 dev_load(ifr.ifr_name);
2526 ret = dev_ethtool(&ifr);
2531 if (copy_to_user(arg, &ifr,
2532 sizeof(struct ifreq)))
2538 * These ioctl calls:
2539 * - require superuser power.
2540 * - require strict serialization.
2546 if (!capable(CAP_NET_ADMIN))
2548 dev_load(ifr.ifr_name);
2550 ret = dev_ifsioc(&ifr, cmd);
2555 if (copy_to_user(arg, &ifr,
2556 sizeof(struct ifreq)))
2562 * These ioctl calls:
2563 * - require superuser power.
2564 * - require strict serialization.
2565 * - do not return a value
2575 case SIOCSIFHWBROADCAST:
2578 case SIOCBONDENSLAVE:
2579 case SIOCBONDRELEASE:
2580 case SIOCBONDSETHWADDR:
2581 case SIOCBONDCHANGEACTIVE:
2584 if (!capable(CAP_NET_ADMIN))
2587 case SIOCBONDSLAVEINFOQUERY:
2588 case SIOCBONDINFOQUERY:
2589 dev_load(ifr.ifr_name);
2591 ret = dev_ifsioc(&ifr, cmd);
2596 /* Get the per device memory space. We can add this but
2597 * currently do not support it */
2599 /* Set the per device memory buffer space.
2600 * Not applicable in our case */
2605 * Unknown or private ioctl.
2608 if (cmd == SIOCWANDEV ||
2609 (cmd >= SIOCDEVPRIVATE &&
2610 cmd <= SIOCDEVPRIVATE + 15)) {
2611 dev_load(ifr.ifr_name);
2613 ret = dev_ifsioc(&ifr, cmd);
2615 if (!ret && copy_to_user(arg, &ifr,
2616 sizeof(struct ifreq)))
2620 #ifdef CONFIG_WIRELESS_EXT
2621 /* Take care of Wireless Extensions */
2622 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
2623 /* If command is `set a parameter', or
2624 * `get the encoding parameters', check if
2625 * the user has the right to do it */
2626 if (IW_IS_SET(cmd) || cmd == SIOCGIWENCODE) {
2627 if (!capable(CAP_NET_ADMIN))
2630 dev_load(ifr.ifr_name);
2632 /* Follow me in net/core/wireless.c */
2633 ret = wireless_process_ioctl(&ifr, cmd);
2635 if (IW_IS_GET(cmd) &&
2636 copy_to_user(arg, &ifr,
2637 sizeof(struct ifreq)))
2641 #endif /* CONFIG_WIRELESS_EXT */
2648 * dev_new_index - allocate an ifindex
2650 * Returns a suitable unique value for a new device interface
2651 * number. The caller must hold the rtnl semaphore or the
2652 * dev_base_lock to be sure it remains unique.
2654 static int dev_new_index(void)
2660 if (!__dev_get_by_index(ifindex))
2665 static int dev_boot_phase = 1;
2667 /* Delayed registration/unregisteration */
2668 static DEFINE_SPINLOCK(net_todo_list_lock);
2669 static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list);
2671 static inline void net_set_todo(struct net_device *dev)
2673 spin_lock(&net_todo_list_lock);
2674 list_add_tail(&dev->todo_list, &net_todo_list);
2675 spin_unlock(&net_todo_list_lock);
2679 * register_netdevice - register a network device
2680 * @dev: device to register
2682 * Take a completed network device structure and add it to the kernel
2683 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
2684 * chain. 0 is returned on success. A negative errno code is returned
2685 * on a failure to set up the device, or if the name is a duplicate.
2687 * Callers must hold the rtnl semaphore. You may want
2688 * register_netdev() instead of this.
2691 * The locking appears insufficient to guarantee two parallel registers
2692 * will not get the same name.
2695 int register_netdevice(struct net_device *dev)
2697 struct hlist_head *head;
2698 struct hlist_node *p;
2701 BUG_ON(dev_boot_phase);
2704 /* When net_device's are persistent, this will be fatal. */
2705 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
2707 spin_lock_init(&dev->queue_lock);
2708 spin_lock_init(&dev->xmit_lock);
2709 dev->xmit_lock_owner = -1;
2710 #ifdef CONFIG_NET_CLS_ACT
2711 spin_lock_init(&dev->ingress_lock);
2714 ret = alloc_divert_blk(dev);
2720 /* Init, if this function is available */
2722 ret = dev->init(dev);
2730 if (!dev_valid_name(dev->name)) {
2735 dev->ifindex = dev_new_index();
2736 if (dev->iflink == -1)
2737 dev->iflink = dev->ifindex;
2739 /* Check for existence of name */
2740 head = dev_name_hash(dev->name);
2741 hlist_for_each(p, head) {
2742 struct net_device *d
2743 = hlist_entry(p, struct net_device, name_hlist);
2744 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
2750 /* Fix illegal SG+CSUM combinations. */
2751 if ((dev->features & NETIF_F_SG) &&
2752 !(dev->features & (NETIF_F_IP_CSUM |
2754 NETIF_F_HW_CSUM))) {
2755 printk("%s: Dropping NETIF_F_SG since no checksum feature.\n",
2757 dev->features &= ~NETIF_F_SG;
2760 /* TSO requires that SG is present as well. */
2761 if ((dev->features & NETIF_F_TSO) &&
2762 !(dev->features & NETIF_F_SG)) {
2763 printk("%s: Dropping NETIF_F_TSO since no SG feature.\n",
2765 dev->features &= ~NETIF_F_TSO;
2767 if (dev->features & NETIF_F_UFO) {
2768 if (!(dev->features & NETIF_F_HW_CSUM)) {
2769 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
2770 "NETIF_F_HW_CSUM feature.\n",
2772 dev->features &= ~NETIF_F_UFO;
2774 if (!(dev->features & NETIF_F_SG)) {
2775 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
2776 "NETIF_F_SG feature.\n",
2778 dev->features &= ~NETIF_F_UFO;
2783 * nil rebuild_header routine,
2784 * that should be never called and used as just bug trap.
2787 if (!dev->rebuild_header)
2788 dev->rebuild_header = default_rebuild_header;
2791 * Default initial state at registry is that the
2792 * device is present.
2795 set_bit(__LINK_STATE_PRESENT, &dev->state);
2798 dev_init_scheduler(dev);
2799 write_lock_bh(&dev_base_lock);
2801 dev_tail = &dev->next;
2802 hlist_add_head(&dev->name_hlist, head);
2803 hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex));
2805 dev->reg_state = NETREG_REGISTERING;
2806 write_unlock_bh(&dev_base_lock);
2808 /* Notify protocols, that a new device appeared. */
2809 notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
2811 /* Finish registration after unlock */
2818 free_divert_blk(dev);
2823 * register_netdev - register a network device
2824 * @dev: device to register
2826 * Take a completed network device structure and add it to the kernel
2827 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
2828 * chain. 0 is returned on success. A negative errno code is returned
2829 * on a failure to set up the device, or if the name is a duplicate.
2831 * This is a wrapper around register_netdev that takes the rtnl semaphore
2832 * and expands the device name if you passed a format string to
2835 int register_netdev(struct net_device *dev)
2842 * If the name is a format string the caller wants us to do a
2845 if (strchr(dev->name, '%')) {
2846 err = dev_alloc_name(dev, dev->name);
2852 * Back compatibility hook. Kill this one in 2.5
2854 if (dev->name[0] == 0 || dev->name[0] == ' ') {
2855 err = dev_alloc_name(dev, "eth%d");
2860 err = register_netdevice(dev);
2865 EXPORT_SYMBOL(register_netdev);
2868 * netdev_wait_allrefs - wait until all references are gone.
2870 * This is called when unregistering network devices.
2872 * Any protocol or device that holds a reference should register
2873 * for netdevice notification, and cleanup and put back the
2874 * reference if they receive an UNREGISTER event.
2875 * We can get stuck here if buggy protocols don't correctly
2878 static void netdev_wait_allrefs(struct net_device *dev)
2880 unsigned long rebroadcast_time, warning_time;
2882 rebroadcast_time = warning_time = jiffies;
2883 while (atomic_read(&dev->refcnt) != 0) {
2884 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
2887 /* Rebroadcast unregister notification */
2888 notifier_call_chain(&netdev_chain,
2889 NETDEV_UNREGISTER, dev);
2891 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
2893 /* We must not have linkwatch events
2894 * pending on unregister. If this
2895 * happens, we simply run the queue
2896 * unscheduled, resulting in a noop
2899 linkwatch_run_queue();
2904 rebroadcast_time = jiffies;
2909 if (time_after(jiffies, warning_time + 10 * HZ)) {
2910 printk(KERN_EMERG "unregister_netdevice: "
2911 "waiting for %s to become free. Usage "
2913 dev->name, atomic_read(&dev->refcnt));
2914 warning_time = jiffies;
2923 * register_netdevice(x1);
2924 * register_netdevice(x2);
2926 * unregister_netdevice(y1);
2927 * unregister_netdevice(y2);
2933 * We are invoked by rtnl_unlock() after it drops the semaphore.
2934 * This allows us to deal with problems:
2935 * 1) We can create/delete sysfs objects which invoke hotplug
2936 * without deadlocking with linkwatch via keventd.
2937 * 2) Since we run with the RTNL semaphore not held, we can sleep
2938 * safely in order to wait for the netdev refcnt to drop to zero.
2940 static DEFINE_MUTEX(net_todo_run_mutex);
2941 void netdev_run_todo(void)
2943 struct list_head list = LIST_HEAD_INIT(list);
2947 /* Need to guard against multiple cpu's getting out of order. */
2948 mutex_lock(&net_todo_run_mutex);
2950 /* Not safe to do outside the semaphore. We must not return
2951 * until all unregister events invoked by the local processor
2952 * have been completed (either by this todo run, or one on
2955 if (list_empty(&net_todo_list))
2958 /* Snapshot list, allow later requests */
2959 spin_lock(&net_todo_list_lock);
2960 list_splice_init(&net_todo_list, &list);
2961 spin_unlock(&net_todo_list_lock);
2963 while (!list_empty(&list)) {
2964 struct net_device *dev
2965 = list_entry(list.next, struct net_device, todo_list);
2966 list_del(&dev->todo_list);
2968 switch(dev->reg_state) {
2969 case NETREG_REGISTERING:
2970 err = netdev_register_sysfs(dev);
2972 printk(KERN_ERR "%s: failed sysfs registration (%d)\n",
2974 dev->reg_state = NETREG_REGISTERED;
2977 case NETREG_UNREGISTERING:
2978 netdev_unregister_sysfs(dev);
2979 dev->reg_state = NETREG_UNREGISTERED;
2981 netdev_wait_allrefs(dev);
2984 BUG_ON(atomic_read(&dev->refcnt));
2985 BUG_TRAP(!dev->ip_ptr);
2986 BUG_TRAP(!dev->ip6_ptr);
2987 BUG_TRAP(!dev->dn_ptr);
2990 /* It must be the very last action,
2991 * after this 'dev' may point to freed up memory.
2993 if (dev->destructor)
2994 dev->destructor(dev);
2998 printk(KERN_ERR "network todo '%s' but state %d\n",
2999 dev->name, dev->reg_state);
3005 mutex_unlock(&net_todo_run_mutex);
3009 * alloc_netdev - allocate network device
3010 * @sizeof_priv: size of private data to allocate space for
3011 * @name: device name format string
3012 * @setup: callback to initialize device
3014 * Allocates a struct net_device with private data area for driver use
3015 * and performs basic initialization.
3017 struct net_device *alloc_netdev(int sizeof_priv, const char *name,
3018 void (*setup)(struct net_device *))
3021 struct net_device *dev;
3024 /* ensure 32-byte alignment of both the device and private area */
3025 alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
3026 alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
3028 p = kmalloc(alloc_size, GFP_KERNEL);
3030 printk(KERN_ERR "alloc_dev: Unable to allocate device.\n");
3033 memset(p, 0, alloc_size);
3035 dev = (struct net_device *)
3036 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
3037 dev->padded = (char *)dev - (char *)p;
3040 dev->priv = netdev_priv(dev);
3043 strcpy(dev->name, name);
3046 EXPORT_SYMBOL(alloc_netdev);
3049 * free_netdev - free network device
3052 * This function does the last stage of destroying an allocated device
3053 * interface. The reference to the device object is released.
3054 * If this is the last reference then it will be freed.
3056 void free_netdev(struct net_device *dev)
3059 /* Compatiablity with error handling in drivers */
3060 if (dev->reg_state == NETREG_UNINITIALIZED) {
3061 kfree((char *)dev - dev->padded);
3065 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
3066 dev->reg_state = NETREG_RELEASED;
3068 /* will free via class release */
3069 class_device_put(&dev->class_dev);
3071 kfree((char *)dev - dev->padded);
3075 /* Synchronize with packet receive processing. */
3076 void synchronize_net(void)
3083 * unregister_netdevice - remove device from the kernel
3086 * This function shuts down a device interface and removes it
3087 * from the kernel tables. On success 0 is returned, on a failure
3088 * a negative errno code is returned.
3090 * Callers must hold the rtnl semaphore. You may want
3091 * unregister_netdev() instead of this.
3094 int unregister_netdevice(struct net_device *dev)
3096 struct net_device *d, **dp;
3098 BUG_ON(dev_boot_phase);
3101 /* Some devices call without registering for initialization unwind. */
3102 if (dev->reg_state == NETREG_UNINITIALIZED) {
3103 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3104 "was registered\n", dev->name, dev);
3108 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3110 /* If device is running, close it first. */
3111 if (dev->flags & IFF_UP)
3114 /* And unlink it from device chain. */
3115 for (dp = &dev_base; (d = *dp) != NULL; dp = &d->next) {
3117 write_lock_bh(&dev_base_lock);
3118 hlist_del(&dev->name_hlist);
3119 hlist_del(&dev->index_hlist);
3120 if (dev_tail == &dev->next)
3123 write_unlock_bh(&dev_base_lock);
3128 printk(KERN_ERR "unregister net_device: '%s' not found\n",
3133 dev->reg_state = NETREG_UNREGISTERING;
3137 /* Shutdown queueing discipline. */
3141 /* Notify protocols, that we are about to destroy
3142 this device. They should clean all the things.
3144 notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
3147 * Flush the multicast chain
3149 dev_mc_discard(dev);
3154 /* Notifier chain MUST detach us from master device. */
3155 BUG_TRAP(!dev->master);
3157 free_divert_blk(dev);
3159 /* Finish processing unregister after unlock */
3169 * unregister_netdev - remove device from the kernel
3172 * This function shuts down a device interface and removes it
3173 * from the kernel tables. On success 0 is returned, on a failure
3174 * a negative errno code is returned.
3176 * This is just a wrapper for unregister_netdevice that takes
3177 * the rtnl semaphore. In general you want to use this and not
3178 * unregister_netdevice.
3180 void unregister_netdev(struct net_device *dev)
3183 unregister_netdevice(dev);
3187 EXPORT_SYMBOL(unregister_netdev);
3189 #ifdef CONFIG_HOTPLUG_CPU
3190 static int dev_cpu_callback(struct notifier_block *nfb,
3191 unsigned long action,
3194 struct sk_buff **list_skb;
3195 struct net_device **list_net;
3196 struct sk_buff *skb;
3197 unsigned int cpu, oldcpu = (unsigned long)ocpu;
3198 struct softnet_data *sd, *oldsd;
3200 if (action != CPU_DEAD)
3203 local_irq_disable();
3204 cpu = smp_processor_id();
3205 sd = &per_cpu(softnet_data, cpu);
3206 oldsd = &per_cpu(softnet_data, oldcpu);
3208 /* Find end of our completion_queue. */
3209 list_skb = &sd->completion_queue;
3211 list_skb = &(*list_skb)->next;
3212 /* Append completion queue from offline CPU. */
3213 *list_skb = oldsd->completion_queue;
3214 oldsd->completion_queue = NULL;
3216 /* Find end of our output_queue. */
3217 list_net = &sd->output_queue;
3219 list_net = &(*list_net)->next_sched;
3220 /* Append output queue from offline CPU. */
3221 *list_net = oldsd->output_queue;
3222 oldsd->output_queue = NULL;
3224 raise_softirq_irqoff(NET_TX_SOFTIRQ);
3227 /* Process offline CPU's input_pkt_queue */
3228 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
3233 #endif /* CONFIG_HOTPLUG_CPU */
3237 * Initialize the DEV module. At boot time this walks the device list and
3238 * unhooks any devices that fail to initialise (normally hardware not
3239 * present) and leaves us with a valid list of present and active devices.
3244 * This is called single threaded during boot, so no need
3245 * to take the rtnl semaphore.
3247 static int __init net_dev_init(void)
3249 int i, rc = -ENOMEM;
3251 BUG_ON(!dev_boot_phase);
3255 if (dev_proc_init())
3258 if (netdev_sysfs_init())
3261 INIT_LIST_HEAD(&ptype_all);
3262 for (i = 0; i < 16; i++)
3263 INIT_LIST_HEAD(&ptype_base[i]);
3265 for (i = 0; i < ARRAY_SIZE(dev_name_head); i++)
3266 INIT_HLIST_HEAD(&dev_name_head[i]);
3268 for (i = 0; i < ARRAY_SIZE(dev_index_head); i++)
3269 INIT_HLIST_HEAD(&dev_index_head[i]);
3272 * Initialise the packet receive queues.
3276 struct softnet_data *queue;
3278 queue = &per_cpu(softnet_data, i);
3279 skb_queue_head_init(&queue->input_pkt_queue);
3280 queue->completion_queue = NULL;
3281 INIT_LIST_HEAD(&queue->poll_list);
3282 set_bit(__LINK_STATE_START, &queue->backlog_dev.state);
3283 queue->backlog_dev.weight = weight_p;
3284 queue->backlog_dev.poll = process_backlog;
3285 atomic_set(&queue->backlog_dev.refcnt, 1);
3290 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
3291 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
3293 hotcpu_notifier(dev_cpu_callback, 0);
3301 subsys_initcall(net_dev_init);
3303 EXPORT_SYMBOL(__dev_get_by_index);
3304 EXPORT_SYMBOL(__dev_get_by_name);
3305 EXPORT_SYMBOL(__dev_remove_pack);
3306 EXPORT_SYMBOL(__skb_linearize);
3307 EXPORT_SYMBOL(dev_valid_name);
3308 EXPORT_SYMBOL(dev_add_pack);
3309 EXPORT_SYMBOL(dev_alloc_name);
3310 EXPORT_SYMBOL(dev_close);
3311 EXPORT_SYMBOL(dev_get_by_flags);
3312 EXPORT_SYMBOL(dev_get_by_index);
3313 EXPORT_SYMBOL(dev_get_by_name);
3314 EXPORT_SYMBOL(dev_open);
3315 EXPORT_SYMBOL(dev_queue_xmit);
3316 EXPORT_SYMBOL(dev_remove_pack);
3317 EXPORT_SYMBOL(dev_set_allmulti);
3318 EXPORT_SYMBOL(dev_set_promiscuity);
3319 EXPORT_SYMBOL(dev_change_flags);
3320 EXPORT_SYMBOL(dev_set_mtu);
3321 EXPORT_SYMBOL(dev_set_mac_address);
3322 EXPORT_SYMBOL(free_netdev);
3323 EXPORT_SYMBOL(netdev_boot_setup_check);
3324 EXPORT_SYMBOL(netdev_set_master);
3325 EXPORT_SYMBOL(netdev_state_change);
3326 EXPORT_SYMBOL(netif_receive_skb);
3327 EXPORT_SYMBOL(netif_rx);
3328 EXPORT_SYMBOL(register_gifconf);
3329 EXPORT_SYMBOL(register_netdevice);
3330 EXPORT_SYMBOL(register_netdevice_notifier);
3331 EXPORT_SYMBOL(skb_checksum_help);
3332 EXPORT_SYMBOL(synchronize_net);
3333 EXPORT_SYMBOL(unregister_netdevice);
3334 EXPORT_SYMBOL(unregister_netdevice_notifier);
3335 EXPORT_SYMBOL(net_enable_timestamp);
3336 EXPORT_SYMBOL(net_disable_timestamp);
3337 EXPORT_SYMBOL(dev_get_flags);
3339 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
3340 EXPORT_SYMBOL(br_handle_frame_hook);
3341 EXPORT_SYMBOL(br_fdb_get_hook);
3342 EXPORT_SYMBOL(br_fdb_put_hook);
3346 EXPORT_SYMBOL(dev_load);
3349 EXPORT_PER_CPU_SYMBOL(softnet_data);