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/config.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/sched.h>
83 #include <linux/string.h>
85 #include <linux/socket.h>
86 #include <linux/sockios.h>
87 #include <linux/errno.h>
88 #include <linux/interrupt.h>
89 #include <linux/if_ether.h>
90 #include <linux/netdevice.h>
91 #include <linux/etherdevice.h>
92 #include <linux/notifier.h>
93 #include <linux/skbuff.h>
95 #include <linux/rtnetlink.h>
96 #include <linux/proc_fs.h>
97 #include <linux/seq_file.h>
98 #include <linux/stat.h>
99 #include <linux/if_bridge.h>
100 #include <linux/divert.h>
102 #include <net/pkt_sched.h>
103 #include <net/checksum.h>
104 #include <linux/highmem.h>
105 #include <linux/init.h>
106 #include <linux/kmod.h>
107 #include <linux/module.h>
108 #include <linux/kallsyms.h>
109 #include <linux/netpoll.h>
110 #include <linux/rcupdate.h>
111 #include <linux/delay.h>
112 #ifdef CONFIG_NET_RADIO
113 #include <linux/wireless.h> /* Note : will define WIRELESS_EXT */
114 #include <net/iw_handler.h>
115 #endif /* CONFIG_NET_RADIO */
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);
270 extern void linkwatch_run_queue(void);
275 * __dev_remove_pack - remove packet handler
276 * @pt: packet type declaration
278 * Remove a protocol handler that was previously added to the kernel
279 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
280 * from the kernel lists and can be freed or reused once this function
283 * The packet type might still be in use by receivers
284 * and must not be freed until after all the CPU's have gone
285 * through a quiescent state.
287 void __dev_remove_pack(struct packet_type *pt)
289 struct list_head *head;
290 struct packet_type *pt1;
292 spin_lock_bh(&ptype_lock);
294 if (pt->type == htons(ETH_P_ALL)) {
298 head = &ptype_base[ntohs(pt->type) & 15];
300 list_for_each_entry(pt1, head, list) {
302 list_del_rcu(&pt->list);
307 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
309 spin_unlock_bh(&ptype_lock);
312 * dev_remove_pack - remove packet handler
313 * @pt: packet type declaration
315 * Remove a protocol handler that was previously added to the kernel
316 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
317 * from the kernel lists and can be freed or reused once this function
320 * This call sleeps to guarantee that no CPU is looking at the packet
323 void dev_remove_pack(struct packet_type *pt)
325 __dev_remove_pack(pt);
330 /******************************************************************************
332 Device Boot-time Settings Routines
334 *******************************************************************************/
336 /* Boot time configuration table */
337 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
340 * netdev_boot_setup_add - add new setup entry
341 * @name: name of the device
342 * @map: configured settings for the device
344 * Adds new setup entry to the dev_boot_setup list. The function
345 * returns 0 on error and 1 on success. This is a generic routine to
348 static int netdev_boot_setup_add(char *name, struct ifmap *map)
350 struct netdev_boot_setup *s;
354 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
355 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
356 memset(s[i].name, 0, sizeof(s[i].name));
357 strcpy(s[i].name, name);
358 memcpy(&s[i].map, map, sizeof(s[i].map));
363 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
367 * netdev_boot_setup_check - check boot time settings
368 * @dev: the netdevice
370 * Check boot time settings for the device.
371 * The found settings are set for the device to be used
372 * later in the device probing.
373 * Returns 0 if no settings found, 1 if they are.
375 int netdev_boot_setup_check(struct net_device *dev)
377 struct netdev_boot_setup *s = dev_boot_setup;
380 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
381 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
382 !strncmp(dev->name, s[i].name, strlen(s[i].name))) {
383 dev->irq = s[i].map.irq;
384 dev->base_addr = s[i].map.base_addr;
385 dev->mem_start = s[i].map.mem_start;
386 dev->mem_end = s[i].map.mem_end;
395 * netdev_boot_base - get address from boot time settings
396 * @prefix: prefix for network device
397 * @unit: id for network device
399 * Check boot time settings for the base address of device.
400 * The found settings are set for the device to be used
401 * later in the device probing.
402 * Returns 0 if no settings found.
404 unsigned long netdev_boot_base(const char *prefix, int unit)
406 const struct netdev_boot_setup *s = dev_boot_setup;
410 sprintf(name, "%s%d", prefix, unit);
413 * If device already registered then return base of 1
414 * to indicate not to probe for this interface
416 if (__dev_get_by_name(name))
419 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
420 if (!strcmp(name, s[i].name))
421 return s[i].map.base_addr;
426 * Saves at boot time configured settings for any netdevice.
428 int __init netdev_boot_setup(char *str)
433 str = get_options(str, ARRAY_SIZE(ints), ints);
438 memset(&map, 0, sizeof(map));
442 map.base_addr = ints[2];
444 map.mem_start = ints[3];
446 map.mem_end = ints[4];
448 /* Add new entry to the list */
449 return netdev_boot_setup_add(str, &map);
452 __setup("netdev=", netdev_boot_setup);
454 /*******************************************************************************
456 Device Interface Subroutines
458 *******************************************************************************/
461 * __dev_get_by_name - find a device by its name
462 * @name: name to find
464 * Find an interface by name. Must be called under RTNL semaphore
465 * or @dev_base_lock. If the name is found a pointer to the device
466 * is returned. If the name is not found then %NULL is returned. The
467 * reference counters are not incremented so the caller must be
468 * careful with locks.
471 struct net_device *__dev_get_by_name(const char *name)
473 struct hlist_node *p;
475 hlist_for_each(p, dev_name_hash(name)) {
476 struct net_device *dev
477 = hlist_entry(p, struct net_device, name_hlist);
478 if (!strncmp(dev->name, name, IFNAMSIZ))
485 * dev_get_by_name - find a device by its name
486 * @name: name to find
488 * Find an interface by name. This can be called from any
489 * context and does its own locking. The returned handle has
490 * the usage count incremented and the caller must use dev_put() to
491 * release it when it is no longer needed. %NULL is returned if no
492 * matching device is found.
495 struct net_device *dev_get_by_name(const char *name)
497 struct net_device *dev;
499 read_lock(&dev_base_lock);
500 dev = __dev_get_by_name(name);
503 read_unlock(&dev_base_lock);
508 * __dev_get_by_index - find a device by its ifindex
509 * @ifindex: index of device
511 * Search for an interface by index. Returns %NULL if the device
512 * is not found or a pointer to the device. The device has not
513 * had its reference counter increased so the caller must be careful
514 * about locking. The caller must hold either the RTNL semaphore
518 struct net_device *__dev_get_by_index(int ifindex)
520 struct hlist_node *p;
522 hlist_for_each(p, dev_index_hash(ifindex)) {
523 struct net_device *dev
524 = hlist_entry(p, struct net_device, index_hlist);
525 if (dev->ifindex == ifindex)
533 * dev_get_by_index - find a device by its ifindex
534 * @ifindex: index of device
536 * Search for an interface by index. Returns NULL if the device
537 * is not found or a pointer to the device. The device returned has
538 * had a reference added and the pointer is safe until the user calls
539 * dev_put to indicate they have finished with it.
542 struct net_device *dev_get_by_index(int ifindex)
544 struct net_device *dev;
546 read_lock(&dev_base_lock);
547 dev = __dev_get_by_index(ifindex);
550 read_unlock(&dev_base_lock);
555 * dev_getbyhwaddr - find a device by its hardware address
556 * @type: media type of device
557 * @ha: hardware address
559 * Search for an interface by MAC address. Returns NULL if the device
560 * is not found or a pointer to the device. The caller must hold the
561 * rtnl semaphore. The returned device has not had its ref count increased
562 * and the caller must therefore be careful about locking
565 * If the API was consistent this would be __dev_get_by_hwaddr
568 struct net_device *dev_getbyhwaddr(unsigned short type, char *ha)
570 struct net_device *dev;
574 for (dev = dev_base; dev; dev = dev->next)
575 if (dev->type == type &&
576 !memcmp(dev->dev_addr, ha, dev->addr_len))
581 struct net_device *dev_getfirstbyhwtype(unsigned short type)
583 struct net_device *dev;
586 for (dev = dev_base; dev; dev = dev->next) {
587 if (dev->type == type) {
596 EXPORT_SYMBOL(dev_getfirstbyhwtype);
599 * dev_get_by_flags - find any device with given flags
600 * @if_flags: IFF_* values
601 * @mask: bitmask of bits in if_flags to check
603 * Search for any interface with the given flags. Returns NULL if a device
604 * is not found or a pointer to the device. The device returned has
605 * had a reference added and the pointer is safe until the user calls
606 * dev_put to indicate they have finished with it.
609 struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mask)
611 struct net_device *dev;
613 read_lock(&dev_base_lock);
614 for (dev = dev_base; dev != NULL; dev = dev->next) {
615 if (((dev->flags ^ if_flags) & mask) == 0) {
620 read_unlock(&dev_base_lock);
625 * dev_valid_name - check if name is okay for network device
628 * Network device names need to be valid file names to
629 * to allow sysfs to work
631 static int dev_valid_name(const char *name)
633 return !(*name == '\0'
634 || !strcmp(name, ".")
635 || !strcmp(name, "..")
636 || strchr(name, '/'));
640 * dev_alloc_name - allocate a name for a device
642 * @name: name format string
644 * Passed a format string - eg "lt%d" it will try and find a suitable
645 * id. Not efficient for many devices, not called a lot. The caller
646 * must hold the dev_base or rtnl lock while allocating the name and
647 * adding the device in order to avoid duplicates. Returns the number
648 * of the unit assigned or a negative errno code.
651 int dev_alloc_name(struct net_device *dev, const char *name)
656 const int max_netdevices = 8*PAGE_SIZE;
658 struct net_device *d;
660 p = strnchr(name, IFNAMSIZ-1, '%');
663 * Verify the string as this thing may have come from
664 * the user. There must be either one "%d" and no other "%"
667 if (p[1] != 'd' || strchr(p + 2, '%'))
670 /* Use one page as a bit array of possible slots */
671 inuse = (long *) get_zeroed_page(GFP_ATOMIC);
675 for (d = dev_base; d; d = d->next) {
676 if (!sscanf(d->name, name, &i))
678 if (i < 0 || i >= max_netdevices)
681 /* avoid cases where sscanf is not exact inverse of printf */
682 snprintf(buf, sizeof(buf), name, i);
683 if (!strncmp(buf, d->name, IFNAMSIZ))
687 i = find_first_zero_bit(inuse, max_netdevices);
688 free_page((unsigned long) inuse);
691 snprintf(buf, sizeof(buf), name, i);
692 if (!__dev_get_by_name(buf)) {
693 strlcpy(dev->name, buf, IFNAMSIZ);
697 /* It is possible to run out of possible slots
698 * when the name is long and there isn't enough space left
699 * for the digits, or if all bits are used.
706 * dev_change_name - change name of a device
708 * @newname: name (or format string) must be at least IFNAMSIZ
710 * Change name of a device, can pass format strings "eth%d".
713 int dev_change_name(struct net_device *dev, char *newname)
719 if (dev->flags & IFF_UP)
722 if (!dev_valid_name(newname))
725 if (strchr(newname, '%')) {
726 err = dev_alloc_name(dev, newname);
729 strcpy(newname, dev->name);
731 else if (__dev_get_by_name(newname))
734 strlcpy(dev->name, newname, IFNAMSIZ);
736 err = class_device_rename(&dev->class_dev, dev->name);
738 hlist_del(&dev->name_hlist);
739 hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name));
740 notifier_call_chain(&netdev_chain, NETDEV_CHANGENAME, dev);
747 * netdev_features_change - device changes fatures
748 * @dev: device to cause notification
750 * Called to indicate a device has changed features.
752 void netdev_features_change(struct net_device *dev)
754 notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
756 EXPORT_SYMBOL(netdev_features_change);
759 * netdev_state_change - device changes state
760 * @dev: device to cause notification
762 * Called to indicate a device has changed state. This function calls
763 * the notifier chains for netdev_chain and sends a NEWLINK message
764 * to the routing socket.
766 void netdev_state_change(struct net_device *dev)
768 if (dev->flags & IFF_UP) {
769 notifier_call_chain(&netdev_chain, NETDEV_CHANGE, dev);
770 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
775 * dev_load - load a network module
776 * @name: name of interface
778 * If a network interface is not present and the process has suitable
779 * privileges this function loads the module. If module loading is not
780 * available in this kernel then it becomes a nop.
783 void dev_load(const char *name)
785 struct net_device *dev;
787 read_lock(&dev_base_lock);
788 dev = __dev_get_by_name(name);
789 read_unlock(&dev_base_lock);
791 if (!dev && capable(CAP_SYS_MODULE))
792 request_module("%s", name);
795 static int default_rebuild_header(struct sk_buff *skb)
797 printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
798 skb->dev ? skb->dev->name : "NULL!!!");
805 * dev_open - prepare an interface for use.
806 * @dev: device to open
808 * Takes a device from down to up state. The device's private open
809 * function is invoked and then the multicast lists are loaded. Finally
810 * the device is moved into the up state and a %NETDEV_UP message is
811 * sent to the netdev notifier chain.
813 * Calling this function on an active interface is a nop. On a failure
814 * a negative errno code is returned.
816 int dev_open(struct net_device *dev)
824 if (dev->flags & IFF_UP)
828 * Is it even present?
830 if (!netif_device_present(dev))
834 * Call device private open method
836 set_bit(__LINK_STATE_START, &dev->state);
838 ret = dev->open(dev);
840 clear_bit(__LINK_STATE_START, &dev->state);
844 * If it went open OK then:
851 dev->flags |= IFF_UP;
854 * Initialize multicasting status
859 * Wakeup transmit queue engine
864 * ... and announce new interface.
866 notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
872 * dev_close - shutdown an interface.
873 * @dev: device to shutdown
875 * This function moves an active device into down state. A
876 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
877 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
880 int dev_close(struct net_device *dev)
882 if (!(dev->flags & IFF_UP))
886 * Tell people we are going down, so that they can
887 * prepare to death, when device is still operating.
889 notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
893 clear_bit(__LINK_STATE_START, &dev->state);
895 /* Synchronize to scheduled poll. We cannot touch poll list,
896 * it can be even on different cpu. So just clear netif_running(),
897 * and wait when poll really will happen. Actually, the best place
898 * for this is inside dev->stop() after device stopped its irq
899 * engine, but this requires more changes in devices. */
901 smp_mb__after_clear_bit(); /* Commit netif_running(). */
902 while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
908 * Call the device specific close. This cannot fail.
909 * Only if device is UP
911 * We allow it to be called even after a DETACH hot-plug
918 * Device is now down.
921 dev->flags &= ~IFF_UP;
924 * Tell people we are down
926 notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
933 * Device change register/unregister. These are not inline or static
934 * as we export them to the world.
938 * register_netdevice_notifier - register a network notifier block
941 * Register a notifier to be called when network device events occur.
942 * The notifier passed is linked into the kernel structures and must
943 * not be reused until it has been unregistered. A negative errno code
944 * is returned on a failure.
946 * When registered all registration and up events are replayed
947 * to the new notifier to allow device to have a race free
948 * view of the network device list.
951 int register_netdevice_notifier(struct notifier_block *nb)
953 struct net_device *dev;
957 err = notifier_chain_register(&netdev_chain, nb);
959 for (dev = dev_base; dev; dev = dev->next) {
960 nb->notifier_call(nb, NETDEV_REGISTER, dev);
962 if (dev->flags & IFF_UP)
963 nb->notifier_call(nb, NETDEV_UP, dev);
971 * unregister_netdevice_notifier - unregister a network notifier block
974 * Unregister a notifier previously registered by
975 * register_netdevice_notifier(). The notifier is unlinked into the
976 * kernel structures and may then be reused. A negative errno code
977 * is returned on a failure.
980 int unregister_netdevice_notifier(struct notifier_block *nb)
982 return notifier_chain_unregister(&netdev_chain, nb);
986 * call_netdevice_notifiers - call all network notifier blocks
987 * @val: value passed unmodified to notifier function
988 * @v: pointer passed unmodified to notifier function
990 * Call all network notifier blocks. Parameters and return value
991 * are as for notifier_call_chain().
994 int call_netdevice_notifiers(unsigned long val, void *v)
996 return notifier_call_chain(&netdev_chain, val, v);
999 /* When > 0 there are consumers of rx skb time stamps */
1000 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1002 void net_enable_timestamp(void)
1004 atomic_inc(&netstamp_needed);
1007 void net_disable_timestamp(void)
1009 atomic_dec(&netstamp_needed);
1012 void __net_timestamp(struct sk_buff *skb)
1016 do_gettimeofday(&tv);
1017 skb_set_timestamp(skb, &tv);
1019 EXPORT_SYMBOL(__net_timestamp);
1021 static inline void net_timestamp(struct sk_buff *skb)
1023 if (atomic_read(&netstamp_needed))
1024 __net_timestamp(skb);
1026 skb->tstamp.off_sec = 0;
1027 skb->tstamp.off_usec = 0;
1032 * Support routine. Sends outgoing frames to any network
1033 * taps currently in use.
1036 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1038 struct packet_type *ptype;
1043 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1044 /* Never send packets back to the socket
1045 * they originated from - MvS (miquels@drinkel.ow.org)
1047 if ((ptype->dev == dev || !ptype->dev) &&
1048 (ptype->af_packet_priv == NULL ||
1049 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1050 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1054 /* skb->nh should be correctly
1055 set by sender, so that the second statement is
1056 just protection against buggy protocols.
1058 skb2->mac.raw = skb2->data;
1060 if (skb2->nh.raw < skb2->data ||
1061 skb2->nh.raw > skb2->tail) {
1062 if (net_ratelimit())
1063 printk(KERN_CRIT "protocol %04x is "
1065 skb2->protocol, dev->name);
1066 skb2->nh.raw = skb2->data;
1069 skb2->h.raw = skb2->nh.raw;
1070 skb2->pkt_type = PACKET_OUTGOING;
1071 ptype->func(skb2, skb->dev, ptype, skb->dev);
1078 * Invalidate hardware checksum when packet is to be mangled, and
1079 * complete checksum manually on outgoing path.
1081 int skb_checksum_help(struct sk_buff *skb, int inward)
1084 int ret = 0, offset = skb->h.raw - skb->data;
1087 skb->ip_summed = CHECKSUM_NONE;
1091 if (skb_cloned(skb)) {
1092 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1097 if (offset > (int)skb->len)
1099 csum = skb_checksum(skb, offset, skb->len-offset, 0);
1101 offset = skb->tail - skb->h.raw;
1104 if (skb->csum + 2 > offset)
1107 *(u16*)(skb->h.raw + skb->csum) = csum_fold(csum);
1108 skb->ip_summed = CHECKSUM_NONE;
1113 #ifdef CONFIG_HIGHMEM
1114 /* Actually, we should eliminate this check as soon as we know, that:
1115 * 1. IOMMU is present and allows to map all the memory.
1116 * 2. No high memory really exists on this machine.
1119 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1123 if (dev->features & NETIF_F_HIGHDMA)
1126 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1127 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1133 #define illegal_highdma(dev, skb) (0)
1136 extern void skb_release_data(struct sk_buff *);
1138 /* Keep head the same: replace data */
1139 int __skb_linearize(struct sk_buff *skb, unsigned int __nocast gfp_mask)
1144 struct skb_shared_info *ninfo;
1145 int headerlen = skb->data - skb->head;
1146 int expand = (skb->tail + skb->data_len) - skb->end;
1148 if (skb_shared(skb))
1154 size = skb->end - skb->head + expand;
1155 size = SKB_DATA_ALIGN(size);
1156 data = kmalloc(size + sizeof(struct skb_shared_info), gfp_mask);
1160 /* Copy entire thing */
1161 if (skb_copy_bits(skb, -headerlen, data, headerlen + skb->len))
1165 ninfo = (struct skb_shared_info*)(data + size);
1166 atomic_set(&ninfo->dataref, 1);
1167 ninfo->tso_size = skb_shinfo(skb)->tso_size;
1168 ninfo->tso_segs = skb_shinfo(skb)->tso_segs;
1169 ninfo->nr_frags = 0;
1170 ninfo->frag_list = NULL;
1172 /* Offset between the two in bytes */
1173 offset = data - skb->head;
1175 /* Free old data. */
1176 skb_release_data(skb);
1179 skb->end = data + size;
1181 /* Set up new pointers */
1182 skb->h.raw += offset;
1183 skb->nh.raw += offset;
1184 skb->mac.raw += offset;
1185 skb->tail += offset;
1186 skb->data += offset;
1188 /* We are no longer a clone, even if we were. */
1191 skb->tail += skb->data_len;
1196 #define HARD_TX_LOCK(dev, cpu) { \
1197 if ((dev->features & NETIF_F_LLTX) == 0) { \
1198 spin_lock(&dev->xmit_lock); \
1199 dev->xmit_lock_owner = cpu; \
1203 #define HARD_TX_UNLOCK(dev) { \
1204 if ((dev->features & NETIF_F_LLTX) == 0) { \
1205 dev->xmit_lock_owner = -1; \
1206 spin_unlock(&dev->xmit_lock); \
1211 * dev_queue_xmit - transmit a buffer
1212 * @skb: buffer to transmit
1214 * Queue a buffer for transmission to a network device. The caller must
1215 * have set the device and priority and built the buffer before calling
1216 * this function. The function can be called from an interrupt.
1218 * A negative errno code is returned on a failure. A success does not
1219 * guarantee the frame will be transmitted as it may be dropped due
1220 * to congestion or traffic shaping.
1222 * -----------------------------------------------------------------------------------
1223 * I notice this method can also return errors from the queue disciplines,
1224 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1227 * Regardless of the return value, the skb is consumed, so it is currently
1228 * difficult to retry a send to this method. (You can bump the ref count
1229 * before sending to hold a reference for retry if you are careful.)
1231 * When calling this method, interrupts MUST be enabled. This is because
1232 * the BH enable code must have IRQs enabled so that it will not deadlock.
1236 int dev_queue_xmit(struct sk_buff *skb)
1238 struct net_device *dev = skb->dev;
1242 if (skb_shinfo(skb)->frag_list &&
1243 !(dev->features & NETIF_F_FRAGLIST) &&
1244 __skb_linearize(skb, GFP_ATOMIC))
1247 /* Fragmented skb is linearized if device does not support SG,
1248 * or if at least one of fragments is in highmem and device
1249 * does not support DMA from it.
1251 if (skb_shinfo(skb)->nr_frags &&
1252 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1253 __skb_linearize(skb, GFP_ATOMIC))
1256 /* If packet is not checksummed and device does not support
1257 * checksumming for this protocol, complete checksumming here.
1259 if (skb->ip_summed == CHECKSUM_HW &&
1260 (!(dev->features & (NETIF_F_HW_CSUM | NETIF_F_NO_CSUM)) &&
1261 (!(dev->features & NETIF_F_IP_CSUM) ||
1262 skb->protocol != htons(ETH_P_IP))))
1263 if (skb_checksum_help(skb, 0))
1266 /* Disable soft irqs for various locks below. Also
1267 * stops preemption for RCU.
1271 /* Updates of qdisc are serialized by queue_lock.
1272 * The struct Qdisc which is pointed to by qdisc is now a
1273 * rcu structure - it may be accessed without acquiring
1274 * a lock (but the structure may be stale.) The freeing of the
1275 * qdisc will be deferred until it's known that there are no
1276 * more references to it.
1278 * If the qdisc has an enqueue function, we still need to
1279 * hold the queue_lock before calling it, since queue_lock
1280 * also serializes access to the device queue.
1283 q = rcu_dereference(dev->qdisc);
1284 #ifdef CONFIG_NET_CLS_ACT
1285 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1288 /* Grab device queue */
1289 spin_lock(&dev->queue_lock);
1291 rc = q->enqueue(skb, q);
1295 spin_unlock(&dev->queue_lock);
1296 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1300 /* The device has no queue. Common case for software devices:
1301 loopback, all the sorts of tunnels...
1303 Really, it is unlikely that xmit_lock protection is necessary here.
1304 (f.e. loopback and IP tunnels are clean ignoring statistics
1306 However, it is possible, that they rely on protection
1309 Check this and shot the lock. It is not prone from deadlocks.
1310 Either shot noqueue qdisc, it is even simpler 8)
1312 if (dev->flags & IFF_UP) {
1313 int cpu = smp_processor_id(); /* ok because BHs are off */
1315 if (dev->xmit_lock_owner != cpu) {
1317 HARD_TX_LOCK(dev, cpu);
1319 if (!netif_queue_stopped(dev)) {
1321 dev_queue_xmit_nit(skb, dev);
1324 if (!dev->hard_start_xmit(skb, dev)) {
1325 HARD_TX_UNLOCK(dev);
1329 HARD_TX_UNLOCK(dev);
1330 if (net_ratelimit())
1331 printk(KERN_CRIT "Virtual device %s asks to "
1332 "queue packet!\n", dev->name);
1334 /* Recursion is detected! It is possible,
1336 if (net_ratelimit())
1337 printk(KERN_CRIT "Dead loop on virtual device "
1338 "%s, fix it urgently!\n", dev->name);
1354 /*=======================================================================
1356 =======================================================================*/
1358 int netdev_max_backlog = 1000;
1359 int netdev_budget = 300;
1360 int weight_p = 64; /* old backlog weight */
1362 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1366 * netif_rx - post buffer to the network code
1367 * @skb: buffer to post
1369 * This function receives a packet from a device driver and queues it for
1370 * the upper (protocol) levels to process. It always succeeds. The buffer
1371 * may be dropped during processing for congestion control or by the
1375 * NET_RX_SUCCESS (no congestion)
1376 * NET_RX_CN_LOW (low congestion)
1377 * NET_RX_CN_MOD (moderate congestion)
1378 * NET_RX_CN_HIGH (high congestion)
1379 * NET_RX_DROP (packet was dropped)
1383 int netif_rx(struct sk_buff *skb)
1385 struct softnet_data *queue;
1386 unsigned long flags;
1388 /* if netpoll wants it, pretend we never saw it */
1389 if (netpoll_rx(skb))
1392 if (!skb->tstamp.off_sec)
1396 * The code is rearranged so that the path is the most
1397 * short when CPU is congested, but is still operating.
1399 local_irq_save(flags);
1400 queue = &__get_cpu_var(softnet_data);
1402 __get_cpu_var(netdev_rx_stat).total++;
1403 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1404 if (queue->input_pkt_queue.qlen) {
1407 __skb_queue_tail(&queue->input_pkt_queue, skb);
1408 local_irq_restore(flags);
1409 return NET_RX_SUCCESS;
1412 netif_rx_schedule(&queue->backlog_dev);
1416 __get_cpu_var(netdev_rx_stat).dropped++;
1417 local_irq_restore(flags);
1423 int netif_rx_ni(struct sk_buff *skb)
1428 err = netif_rx(skb);
1429 if (local_softirq_pending())
1436 EXPORT_SYMBOL(netif_rx_ni);
1438 static inline struct net_device *skb_bond(struct sk_buff *skb)
1440 struct net_device *dev = skb->dev;
1443 skb->dev = dev->master;
1448 static void net_tx_action(struct softirq_action *h)
1450 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1452 if (sd->completion_queue) {
1453 struct sk_buff *clist;
1455 local_irq_disable();
1456 clist = sd->completion_queue;
1457 sd->completion_queue = NULL;
1461 struct sk_buff *skb = clist;
1462 clist = clist->next;
1464 BUG_TRAP(!atomic_read(&skb->users));
1469 if (sd->output_queue) {
1470 struct net_device *head;
1472 local_irq_disable();
1473 head = sd->output_queue;
1474 sd->output_queue = NULL;
1478 struct net_device *dev = head;
1479 head = head->next_sched;
1481 smp_mb__before_clear_bit();
1482 clear_bit(__LINK_STATE_SCHED, &dev->state);
1484 if (spin_trylock(&dev->queue_lock)) {
1486 spin_unlock(&dev->queue_lock);
1488 netif_schedule(dev);
1494 static __inline__ int deliver_skb(struct sk_buff *skb,
1495 struct packet_type *pt_prev,
1496 struct net_device *orig_dev)
1498 atomic_inc(&skb->users);
1499 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1502 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1503 int (*br_handle_frame_hook)(struct net_bridge_port *p, struct sk_buff **pskb);
1505 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1506 unsigned char *addr);
1507 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
1509 static __inline__ int handle_bridge(struct sk_buff **pskb,
1510 struct packet_type **pt_prev, int *ret,
1511 struct net_device *orig_dev)
1513 struct net_bridge_port *port;
1515 if ((*pskb)->pkt_type == PACKET_LOOPBACK ||
1516 (port = rcu_dereference((*pskb)->dev->br_port)) == NULL)
1520 *ret = deliver_skb(*pskb, *pt_prev, orig_dev);
1524 return br_handle_frame_hook(port, pskb);
1527 #define handle_bridge(skb, pt_prev, ret, orig_dev) (0)
1530 #ifdef CONFIG_NET_CLS_ACT
1531 /* TODO: Maybe we should just force sch_ingress to be compiled in
1532 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
1533 * a compare and 2 stores extra right now if we dont have it on
1534 * but have CONFIG_NET_CLS_ACT
1535 * NOTE: This doesnt stop any functionality; if you dont have
1536 * the ingress scheduler, you just cant add policies on ingress.
1539 static int ing_filter(struct sk_buff *skb)
1542 struct net_device *dev = skb->dev;
1543 int result = TC_ACT_OK;
1545 if (dev->qdisc_ingress) {
1546 __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
1547 if (MAX_RED_LOOP < ttl++) {
1548 printk("Redir loop detected Dropping packet (%s->%s)\n",
1549 skb->input_dev->name, skb->dev->name);
1553 skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl);
1555 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS);
1557 spin_lock(&dev->ingress_lock);
1558 if ((q = dev->qdisc_ingress) != NULL)
1559 result = q->enqueue(skb, q);
1560 spin_unlock(&dev->ingress_lock);
1568 int netif_receive_skb(struct sk_buff *skb)
1570 struct packet_type *ptype, *pt_prev;
1571 struct net_device *orig_dev;
1572 int ret = NET_RX_DROP;
1573 unsigned short type;
1575 /* if we've gotten here through NAPI, check netpoll */
1576 if (skb->dev->poll && netpoll_rx(skb))
1579 if (!skb->tstamp.off_sec)
1582 if (!skb->input_dev)
1583 skb->input_dev = skb->dev;
1585 orig_dev = skb_bond(skb);
1587 __get_cpu_var(netdev_rx_stat).total++;
1589 skb->h.raw = skb->nh.raw = skb->data;
1590 skb->mac_len = skb->nh.raw - skb->mac.raw;
1596 #ifdef CONFIG_NET_CLS_ACT
1597 if (skb->tc_verd & TC_NCLS) {
1598 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
1603 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1604 if (!ptype->dev || ptype->dev == skb->dev) {
1606 ret = deliver_skb(skb, pt_prev, orig_dev);
1611 #ifdef CONFIG_NET_CLS_ACT
1613 ret = deliver_skb(skb, pt_prev, orig_dev);
1614 pt_prev = NULL; /* noone else should process this after*/
1616 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
1619 ret = ing_filter(skb);
1621 if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
1630 handle_diverter(skb);
1632 if (handle_bridge(&skb, &pt_prev, &ret, orig_dev))
1635 type = skb->protocol;
1636 list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {
1637 if (ptype->type == type &&
1638 (!ptype->dev || ptype->dev == skb->dev)) {
1640 ret = deliver_skb(skb, pt_prev, orig_dev);
1646 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1649 /* Jamal, now you will not able to escape explaining
1650 * me how you were going to use this. :-)
1660 static int process_backlog(struct net_device *backlog_dev, int *budget)
1663 int quota = min(backlog_dev->quota, *budget);
1664 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1665 unsigned long start_time = jiffies;
1667 backlog_dev->weight = weight_p;
1669 struct sk_buff *skb;
1670 struct net_device *dev;
1672 local_irq_disable();
1673 skb = __skb_dequeue(&queue->input_pkt_queue);
1680 netif_receive_skb(skb);
1686 if (work >= quota || jiffies - start_time > 1)
1691 backlog_dev->quota -= work;
1696 backlog_dev->quota -= work;
1699 list_del(&backlog_dev->poll_list);
1700 smp_mb__before_clear_bit();
1701 netif_poll_enable(backlog_dev);
1707 static void net_rx_action(struct softirq_action *h)
1709 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1710 unsigned long start_time = jiffies;
1711 int budget = netdev_budget;
1714 local_irq_disable();
1716 while (!list_empty(&queue->poll_list)) {
1717 struct net_device *dev;
1719 if (budget <= 0 || jiffies - start_time > 1)
1724 dev = list_entry(queue->poll_list.next,
1725 struct net_device, poll_list);
1726 have = netpoll_poll_lock(dev);
1728 if (dev->quota <= 0 || dev->poll(dev, &budget)) {
1729 netpoll_poll_unlock(have);
1730 local_irq_disable();
1731 list_del(&dev->poll_list);
1732 list_add_tail(&dev->poll_list, &queue->poll_list);
1734 dev->quota += dev->weight;
1736 dev->quota = dev->weight;
1738 netpoll_poll_unlock(have);
1740 local_irq_disable();
1748 __get_cpu_var(netdev_rx_stat).time_squeeze++;
1749 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
1753 static gifconf_func_t * gifconf_list [NPROTO];
1756 * register_gifconf - register a SIOCGIF handler
1757 * @family: Address family
1758 * @gifconf: Function handler
1760 * Register protocol dependent address dumping routines. The handler
1761 * that is passed must not be freed or reused until it has been replaced
1762 * by another handler.
1764 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
1766 if (family >= NPROTO)
1768 gifconf_list[family] = gifconf;
1774 * Map an interface index to its name (SIOCGIFNAME)
1778 * We need this ioctl for efficient implementation of the
1779 * if_indextoname() function required by the IPv6 API. Without
1780 * it, we would have to search all the interfaces to find a
1784 static int dev_ifname(struct ifreq __user *arg)
1786 struct net_device *dev;
1790 * Fetch the caller's info block.
1793 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
1796 read_lock(&dev_base_lock);
1797 dev = __dev_get_by_index(ifr.ifr_ifindex);
1799 read_unlock(&dev_base_lock);
1803 strcpy(ifr.ifr_name, dev->name);
1804 read_unlock(&dev_base_lock);
1806 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
1812 * Perform a SIOCGIFCONF call. This structure will change
1813 * size eventually, and there is nothing I can do about it.
1814 * Thus we will need a 'compatibility mode'.
1817 static int dev_ifconf(char __user *arg)
1820 struct net_device *dev;
1827 * Fetch the caller's info block.
1830 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
1837 * Loop over the interfaces, and write an info block for each.
1841 for (dev = dev_base; dev; dev = dev->next) {
1842 for (i = 0; i < NPROTO; i++) {
1843 if (gifconf_list[i]) {
1846 done = gifconf_list[i](dev, NULL, 0);
1848 done = gifconf_list[i](dev, pos + total,
1858 * All done. Write the updated control block back to the caller.
1860 ifc.ifc_len = total;
1863 * Both BSD and Solaris return 0 here, so we do too.
1865 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
1868 #ifdef CONFIG_PROC_FS
1870 * This is invoked by the /proc filesystem handler to display a device
1873 static __inline__ struct net_device *dev_get_idx(loff_t pos)
1875 struct net_device *dev;
1878 for (i = 0, dev = dev_base; dev && i < pos; ++i, dev = dev->next);
1880 return i == pos ? dev : NULL;
1883 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
1885 read_lock(&dev_base_lock);
1886 return *pos ? dev_get_idx(*pos - 1) : SEQ_START_TOKEN;
1889 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1892 return v == SEQ_START_TOKEN ? dev_base : ((struct net_device *)v)->next;
1895 void dev_seq_stop(struct seq_file *seq, void *v)
1897 read_unlock(&dev_base_lock);
1900 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
1902 if (dev->get_stats) {
1903 struct net_device_stats *stats = dev->get_stats(dev);
1905 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
1906 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
1907 dev->name, stats->rx_bytes, stats->rx_packets,
1909 stats->rx_dropped + stats->rx_missed_errors,
1910 stats->rx_fifo_errors,
1911 stats->rx_length_errors + stats->rx_over_errors +
1912 stats->rx_crc_errors + stats->rx_frame_errors,
1913 stats->rx_compressed, stats->multicast,
1914 stats->tx_bytes, stats->tx_packets,
1915 stats->tx_errors, stats->tx_dropped,
1916 stats->tx_fifo_errors, stats->collisions,
1917 stats->tx_carrier_errors +
1918 stats->tx_aborted_errors +
1919 stats->tx_window_errors +
1920 stats->tx_heartbeat_errors,
1921 stats->tx_compressed);
1923 seq_printf(seq, "%6s: No statistics available.\n", dev->name);
1927 * Called from the PROCfs module. This now uses the new arbitrary sized
1928 * /proc/net interface to create /proc/net/dev
1930 static int dev_seq_show(struct seq_file *seq, void *v)
1932 if (v == SEQ_START_TOKEN)
1933 seq_puts(seq, "Inter-| Receive "
1935 " face |bytes packets errs drop fifo frame "
1936 "compressed multicast|bytes packets errs "
1937 "drop fifo colls carrier compressed\n");
1939 dev_seq_printf_stats(seq, v);
1943 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
1945 struct netif_rx_stats *rc = NULL;
1947 while (*pos < NR_CPUS)
1948 if (cpu_online(*pos)) {
1949 rc = &per_cpu(netdev_rx_stat, *pos);
1956 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
1958 return softnet_get_online(pos);
1961 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1964 return softnet_get_online(pos);
1967 static void softnet_seq_stop(struct seq_file *seq, void *v)
1971 static int softnet_seq_show(struct seq_file *seq, void *v)
1973 struct netif_rx_stats *s = v;
1975 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
1976 s->total, s->dropped, s->time_squeeze, 0,
1977 0, 0, 0, 0, /* was fastroute */
1982 static struct seq_operations dev_seq_ops = {
1983 .start = dev_seq_start,
1984 .next = dev_seq_next,
1985 .stop = dev_seq_stop,
1986 .show = dev_seq_show,
1989 static int dev_seq_open(struct inode *inode, struct file *file)
1991 return seq_open(file, &dev_seq_ops);
1994 static struct file_operations dev_seq_fops = {
1995 .owner = THIS_MODULE,
1996 .open = dev_seq_open,
1998 .llseek = seq_lseek,
1999 .release = seq_release,
2002 static struct seq_operations softnet_seq_ops = {
2003 .start = softnet_seq_start,
2004 .next = softnet_seq_next,
2005 .stop = softnet_seq_stop,
2006 .show = softnet_seq_show,
2009 static int softnet_seq_open(struct inode *inode, struct file *file)
2011 return seq_open(file, &softnet_seq_ops);
2014 static struct file_operations softnet_seq_fops = {
2015 .owner = THIS_MODULE,
2016 .open = softnet_seq_open,
2018 .llseek = seq_lseek,
2019 .release = seq_release,
2023 extern int wireless_proc_init(void);
2025 #define wireless_proc_init() 0
2028 static int __init dev_proc_init(void)
2032 if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops))
2034 if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops))
2036 if (wireless_proc_init())
2042 proc_net_remove("softnet_stat");
2044 proc_net_remove("dev");
2048 #define dev_proc_init() 0
2049 #endif /* CONFIG_PROC_FS */
2053 * netdev_set_master - set up master/slave pair
2054 * @slave: slave device
2055 * @master: new master device
2057 * Changes the master device of the slave. Pass %NULL to break the
2058 * bonding. The caller must hold the RTNL semaphore. On a failure
2059 * a negative errno code is returned. On success the reference counts
2060 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2061 * function returns zero.
2063 int netdev_set_master(struct net_device *slave, struct net_device *master)
2065 struct net_device *old = slave->master;
2075 slave->master = master;
2083 slave->flags |= IFF_SLAVE;
2085 slave->flags &= ~IFF_SLAVE;
2087 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2092 * dev_set_promiscuity - update promiscuity count on a device
2096 * Add or remove promsicuity from a device. While the count in the device
2097 * remains above zero the interface remains promiscuous. Once it hits zero
2098 * the device reverts back to normal filtering operation. A negative inc
2099 * value is used to drop promiscuity on the device.
2101 void dev_set_promiscuity(struct net_device *dev, int inc)
2103 unsigned short old_flags = dev->flags;
2105 if ((dev->promiscuity += inc) == 0)
2106 dev->flags &= ~IFF_PROMISC;
2108 dev->flags |= IFF_PROMISC;
2109 if (dev->flags != old_flags) {
2111 printk(KERN_INFO "device %s %s promiscuous mode\n",
2112 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2118 * dev_set_allmulti - update allmulti count on a device
2122 * Add or remove reception of all multicast frames to a device. While the
2123 * count in the device remains above zero the interface remains listening
2124 * to all interfaces. Once it hits zero the device reverts back to normal
2125 * filtering operation. A negative @inc value is used to drop the counter
2126 * when releasing a resource needing all multicasts.
2129 void dev_set_allmulti(struct net_device *dev, int inc)
2131 unsigned short old_flags = dev->flags;
2133 dev->flags |= IFF_ALLMULTI;
2134 if ((dev->allmulti += inc) == 0)
2135 dev->flags &= ~IFF_ALLMULTI;
2136 if (dev->flags ^ old_flags)
2140 unsigned dev_get_flags(const struct net_device *dev)
2144 flags = (dev->flags & ~(IFF_PROMISC |
2147 (dev->gflags & (IFF_PROMISC |
2150 if (netif_running(dev) && netif_carrier_ok(dev))
2151 flags |= IFF_RUNNING;
2156 int dev_change_flags(struct net_device *dev, unsigned flags)
2159 int old_flags = dev->flags;
2162 * Set the flags on our device.
2165 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
2166 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
2168 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
2172 * Load in the correct multicast list now the flags have changed.
2178 * Have we downed the interface. We handle IFF_UP ourselves
2179 * according to user attempts to set it, rather than blindly
2184 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
2185 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
2191 if (dev->flags & IFF_UP &&
2192 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
2194 notifier_call_chain(&netdev_chain, NETDEV_CHANGE, dev);
2196 if ((flags ^ dev->gflags) & IFF_PROMISC) {
2197 int inc = (flags & IFF_PROMISC) ? +1 : -1;
2198 dev->gflags ^= IFF_PROMISC;
2199 dev_set_promiscuity(dev, inc);
2202 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
2203 is important. Some (broken) drivers set IFF_PROMISC, when
2204 IFF_ALLMULTI is requested not asking us and not reporting.
2206 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
2207 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
2208 dev->gflags ^= IFF_ALLMULTI;
2209 dev_set_allmulti(dev, inc);
2212 if (old_flags ^ dev->flags)
2213 rtmsg_ifinfo(RTM_NEWLINK, dev, old_flags ^ dev->flags);
2218 int dev_set_mtu(struct net_device *dev, int new_mtu)
2222 if (new_mtu == dev->mtu)
2225 /* MTU must be positive. */
2229 if (!netif_device_present(dev))
2233 if (dev->change_mtu)
2234 err = dev->change_mtu(dev, new_mtu);
2237 if (!err && dev->flags & IFF_UP)
2238 notifier_call_chain(&netdev_chain,
2239 NETDEV_CHANGEMTU, dev);
2243 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
2247 if (!dev->set_mac_address)
2249 if (sa->sa_family != dev->type)
2251 if (!netif_device_present(dev))
2253 err = dev->set_mac_address(dev, sa);
2255 notifier_call_chain(&netdev_chain, NETDEV_CHANGEADDR, dev);
2260 * Perform the SIOCxIFxxx calls.
2262 static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
2265 struct net_device *dev = __dev_get_by_name(ifr->ifr_name);
2271 case SIOCGIFFLAGS: /* Get interface flags */
2272 ifr->ifr_flags = dev_get_flags(dev);
2275 case SIOCSIFFLAGS: /* Set interface flags */
2276 return dev_change_flags(dev, ifr->ifr_flags);
2278 case SIOCGIFMETRIC: /* Get the metric on the interface
2279 (currently unused) */
2280 ifr->ifr_metric = 0;
2283 case SIOCSIFMETRIC: /* Set the metric on the interface
2284 (currently unused) */
2287 case SIOCGIFMTU: /* Get the MTU of a device */
2288 ifr->ifr_mtu = dev->mtu;
2291 case SIOCSIFMTU: /* Set the MTU of a device */
2292 return dev_set_mtu(dev, ifr->ifr_mtu);
2296 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
2298 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
2299 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2300 ifr->ifr_hwaddr.sa_family = dev->type;
2304 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
2306 case SIOCSIFHWBROADCAST:
2307 if (ifr->ifr_hwaddr.sa_family != dev->type)
2309 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
2310 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2311 notifier_call_chain(&netdev_chain,
2312 NETDEV_CHANGEADDR, dev);
2316 ifr->ifr_map.mem_start = dev->mem_start;
2317 ifr->ifr_map.mem_end = dev->mem_end;
2318 ifr->ifr_map.base_addr = dev->base_addr;
2319 ifr->ifr_map.irq = dev->irq;
2320 ifr->ifr_map.dma = dev->dma;
2321 ifr->ifr_map.port = dev->if_port;
2325 if (dev->set_config) {
2326 if (!netif_device_present(dev))
2328 return dev->set_config(dev, &ifr->ifr_map);
2333 if (!dev->set_multicast_list ||
2334 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2336 if (!netif_device_present(dev))
2338 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
2342 if (!dev->set_multicast_list ||
2343 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2345 if (!netif_device_present(dev))
2347 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
2351 ifr->ifr_ifindex = dev->ifindex;
2355 ifr->ifr_qlen = dev->tx_queue_len;
2359 if (ifr->ifr_qlen < 0)
2361 dev->tx_queue_len = ifr->ifr_qlen;
2365 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
2366 return dev_change_name(dev, ifr->ifr_newname);
2369 * Unknown or private ioctl
2373 if ((cmd >= SIOCDEVPRIVATE &&
2374 cmd <= SIOCDEVPRIVATE + 15) ||
2375 cmd == SIOCBONDENSLAVE ||
2376 cmd == SIOCBONDRELEASE ||
2377 cmd == SIOCBONDSETHWADDR ||
2378 cmd == SIOCBONDSLAVEINFOQUERY ||
2379 cmd == SIOCBONDINFOQUERY ||
2380 cmd == SIOCBONDCHANGEACTIVE ||
2381 cmd == SIOCGMIIPHY ||
2382 cmd == SIOCGMIIREG ||
2383 cmd == SIOCSMIIREG ||
2384 cmd == SIOCBRADDIF ||
2385 cmd == SIOCBRDELIF ||
2386 cmd == SIOCWANDEV) {
2388 if (dev->do_ioctl) {
2389 if (netif_device_present(dev))
2390 err = dev->do_ioctl(dev, ifr,
2403 * This function handles all "interface"-type I/O control requests. The actual
2404 * 'doing' part of this is dev_ifsioc above.
2408 * dev_ioctl - network device ioctl
2409 * @cmd: command to issue
2410 * @arg: pointer to a struct ifreq in user space
2412 * Issue ioctl functions to devices. This is normally called by the
2413 * user space syscall interfaces but can sometimes be useful for
2414 * other purposes. The return value is the return from the syscall if
2415 * positive or a negative errno code on error.
2418 int dev_ioctl(unsigned int cmd, void __user *arg)
2424 /* One special case: SIOCGIFCONF takes ifconf argument
2425 and requires shared lock, because it sleeps writing
2429 if (cmd == SIOCGIFCONF) {
2431 ret = dev_ifconf((char __user *) arg);
2435 if (cmd == SIOCGIFNAME)
2436 return dev_ifname((struct ifreq __user *)arg);
2438 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2441 ifr.ifr_name[IFNAMSIZ-1] = 0;
2443 colon = strchr(ifr.ifr_name, ':');
2448 * See which interface the caller is talking about.
2453 * These ioctl calls:
2454 * - can be done by all.
2455 * - atomic and do not require locking.
2466 dev_load(ifr.ifr_name);
2467 read_lock(&dev_base_lock);
2468 ret = dev_ifsioc(&ifr, cmd);
2469 read_unlock(&dev_base_lock);
2473 if (copy_to_user(arg, &ifr,
2474 sizeof(struct ifreq)))
2480 dev_load(ifr.ifr_name);
2482 ret = dev_ethtool(&ifr);
2487 if (copy_to_user(arg, &ifr,
2488 sizeof(struct ifreq)))
2494 * These ioctl calls:
2495 * - require superuser power.
2496 * - require strict serialization.
2502 if (!capable(CAP_NET_ADMIN))
2504 dev_load(ifr.ifr_name);
2506 ret = dev_ifsioc(&ifr, cmd);
2511 if (copy_to_user(arg, &ifr,
2512 sizeof(struct ifreq)))
2518 * These ioctl calls:
2519 * - require superuser power.
2520 * - require strict serialization.
2521 * - do not return a value
2531 case SIOCSIFHWBROADCAST:
2534 case SIOCBONDENSLAVE:
2535 case SIOCBONDRELEASE:
2536 case SIOCBONDSETHWADDR:
2537 case SIOCBONDSLAVEINFOQUERY:
2538 case SIOCBONDINFOQUERY:
2539 case SIOCBONDCHANGEACTIVE:
2542 if (!capable(CAP_NET_ADMIN))
2544 dev_load(ifr.ifr_name);
2546 ret = dev_ifsioc(&ifr, cmd);
2551 /* Get the per device memory space. We can add this but
2552 * currently do not support it */
2554 /* Set the per device memory buffer space.
2555 * Not applicable in our case */
2560 * Unknown or private ioctl.
2563 if (cmd == SIOCWANDEV ||
2564 (cmd >= SIOCDEVPRIVATE &&
2565 cmd <= SIOCDEVPRIVATE + 15)) {
2566 dev_load(ifr.ifr_name);
2568 ret = dev_ifsioc(&ifr, cmd);
2570 if (!ret && copy_to_user(arg, &ifr,
2571 sizeof(struct ifreq)))
2576 /* Take care of Wireless Extensions */
2577 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
2578 /* If command is `set a parameter', or
2579 * `get the encoding parameters', check if
2580 * the user has the right to do it */
2581 if (IW_IS_SET(cmd) || cmd == SIOCGIWENCODE) {
2582 if (!capable(CAP_NET_ADMIN))
2585 dev_load(ifr.ifr_name);
2587 /* Follow me in net/core/wireless.c */
2588 ret = wireless_process_ioctl(&ifr, cmd);
2590 if (IW_IS_GET(cmd) &&
2591 copy_to_user(arg, &ifr,
2592 sizeof(struct ifreq)))
2596 #endif /* WIRELESS_EXT */
2603 * dev_new_index - allocate an ifindex
2605 * Returns a suitable unique value for a new device interface
2606 * number. The caller must hold the rtnl semaphore or the
2607 * dev_base_lock to be sure it remains unique.
2609 static int dev_new_index(void)
2615 if (!__dev_get_by_index(ifindex))
2620 static int dev_boot_phase = 1;
2622 /* Delayed registration/unregisteration */
2623 static DEFINE_SPINLOCK(net_todo_list_lock);
2624 static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list);
2626 static inline void net_set_todo(struct net_device *dev)
2628 spin_lock(&net_todo_list_lock);
2629 list_add_tail(&dev->todo_list, &net_todo_list);
2630 spin_unlock(&net_todo_list_lock);
2634 * register_netdevice - register a network device
2635 * @dev: device to register
2637 * Take a completed network device structure and add it to the kernel
2638 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
2639 * chain. 0 is returned on success. A negative errno code is returned
2640 * on a failure to set up the device, or if the name is a duplicate.
2642 * Callers must hold the rtnl semaphore. You may want
2643 * register_netdev() instead of this.
2646 * The locking appears insufficient to guarantee two parallel registers
2647 * will not get the same name.
2650 int register_netdevice(struct net_device *dev)
2652 struct hlist_head *head;
2653 struct hlist_node *p;
2656 BUG_ON(dev_boot_phase);
2659 /* When net_device's are persistent, this will be fatal. */
2660 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
2662 spin_lock_init(&dev->queue_lock);
2663 spin_lock_init(&dev->xmit_lock);
2664 dev->xmit_lock_owner = -1;
2665 #ifdef CONFIG_NET_CLS_ACT
2666 spin_lock_init(&dev->ingress_lock);
2669 ret = alloc_divert_blk(dev);
2675 /* Init, if this function is available */
2677 ret = dev->init(dev);
2685 if (!dev_valid_name(dev->name)) {
2690 dev->ifindex = dev_new_index();
2691 if (dev->iflink == -1)
2692 dev->iflink = dev->ifindex;
2694 /* Check for existence of name */
2695 head = dev_name_hash(dev->name);
2696 hlist_for_each(p, head) {
2697 struct net_device *d
2698 = hlist_entry(p, struct net_device, name_hlist);
2699 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
2705 /* Fix illegal SG+CSUM combinations. */
2706 if ((dev->features & NETIF_F_SG) &&
2707 !(dev->features & (NETIF_F_IP_CSUM |
2709 NETIF_F_HW_CSUM))) {
2710 printk("%s: Dropping NETIF_F_SG since no checksum feature.\n",
2712 dev->features &= ~NETIF_F_SG;
2715 /* TSO requires that SG is present as well. */
2716 if ((dev->features & NETIF_F_TSO) &&
2717 !(dev->features & NETIF_F_SG)) {
2718 printk("%s: Dropping NETIF_F_TSO since no SG feature.\n",
2720 dev->features &= ~NETIF_F_TSO;
2724 * nil rebuild_header routine,
2725 * that should be never called and used as just bug trap.
2728 if (!dev->rebuild_header)
2729 dev->rebuild_header = default_rebuild_header;
2732 * Default initial state at registry is that the
2733 * device is present.
2736 set_bit(__LINK_STATE_PRESENT, &dev->state);
2739 dev_init_scheduler(dev);
2740 write_lock_bh(&dev_base_lock);
2742 dev_tail = &dev->next;
2743 hlist_add_head(&dev->name_hlist, head);
2744 hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex));
2746 dev->reg_state = NETREG_REGISTERING;
2747 write_unlock_bh(&dev_base_lock);
2749 /* Notify protocols, that a new device appeared. */
2750 notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
2752 /* Finish registration after unlock */
2759 free_divert_blk(dev);
2764 * register_netdev - register a network device
2765 * @dev: device to register
2767 * Take a completed network device structure and add it to the kernel
2768 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
2769 * chain. 0 is returned on success. A negative errno code is returned
2770 * on a failure to set up the device, or if the name is a duplicate.
2772 * This is a wrapper around register_netdev that takes the rtnl semaphore
2773 * and expands the device name if you passed a format string to
2776 int register_netdev(struct net_device *dev)
2783 * If the name is a format string the caller wants us to do a
2786 if (strchr(dev->name, '%')) {
2787 err = dev_alloc_name(dev, dev->name);
2793 * Back compatibility hook. Kill this one in 2.5
2795 if (dev->name[0] == 0 || dev->name[0] == ' ') {
2796 err = dev_alloc_name(dev, "eth%d");
2801 err = register_netdevice(dev);
2806 EXPORT_SYMBOL(register_netdev);
2809 * netdev_wait_allrefs - wait until all references are gone.
2811 * This is called when unregistering network devices.
2813 * Any protocol or device that holds a reference should register
2814 * for netdevice notification, and cleanup and put back the
2815 * reference if they receive an UNREGISTER event.
2816 * We can get stuck here if buggy protocols don't correctly
2819 static void netdev_wait_allrefs(struct net_device *dev)
2821 unsigned long rebroadcast_time, warning_time;
2823 rebroadcast_time = warning_time = jiffies;
2824 while (atomic_read(&dev->refcnt) != 0) {
2825 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
2828 /* Rebroadcast unregister notification */
2829 notifier_call_chain(&netdev_chain,
2830 NETDEV_UNREGISTER, dev);
2832 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
2834 /* We must not have linkwatch events
2835 * pending on unregister. If this
2836 * happens, we simply run the queue
2837 * unscheduled, resulting in a noop
2840 linkwatch_run_queue();
2845 rebroadcast_time = jiffies;
2850 if (time_after(jiffies, warning_time + 10 * HZ)) {
2851 printk(KERN_EMERG "unregister_netdevice: "
2852 "waiting for %s to become free. Usage "
2854 dev->name, atomic_read(&dev->refcnt));
2855 warning_time = jiffies;
2864 * register_netdevice(x1);
2865 * register_netdevice(x2);
2867 * unregister_netdevice(y1);
2868 * unregister_netdevice(y2);
2874 * We are invoked by rtnl_unlock() after it drops the semaphore.
2875 * This allows us to deal with problems:
2876 * 1) We can create/delete sysfs objects which invoke hotplug
2877 * without deadlocking with linkwatch via keventd.
2878 * 2) Since we run with the RTNL semaphore not held, we can sleep
2879 * safely in order to wait for the netdev refcnt to drop to zero.
2881 static DECLARE_MUTEX(net_todo_run_mutex);
2882 void netdev_run_todo(void)
2884 struct list_head list = LIST_HEAD_INIT(list);
2888 /* Need to guard against multiple cpu's getting out of order. */
2889 down(&net_todo_run_mutex);
2891 /* Not safe to do outside the semaphore. We must not return
2892 * until all unregister events invoked by the local processor
2893 * have been completed (either by this todo run, or one on
2896 if (list_empty(&net_todo_list))
2899 /* Snapshot list, allow later requests */
2900 spin_lock(&net_todo_list_lock);
2901 list_splice_init(&net_todo_list, &list);
2902 spin_unlock(&net_todo_list_lock);
2904 while (!list_empty(&list)) {
2905 struct net_device *dev
2906 = list_entry(list.next, struct net_device, todo_list);
2907 list_del(&dev->todo_list);
2909 switch(dev->reg_state) {
2910 case NETREG_REGISTERING:
2911 err = netdev_register_sysfs(dev);
2913 printk(KERN_ERR "%s: failed sysfs registration (%d)\n",
2915 dev->reg_state = NETREG_REGISTERED;
2918 case NETREG_UNREGISTERING:
2919 netdev_unregister_sysfs(dev);
2920 dev->reg_state = NETREG_UNREGISTERED;
2922 netdev_wait_allrefs(dev);
2925 BUG_ON(atomic_read(&dev->refcnt));
2926 BUG_TRAP(!dev->ip_ptr);
2927 BUG_TRAP(!dev->ip6_ptr);
2928 BUG_TRAP(!dev->dn_ptr);
2931 /* It must be the very last action,
2932 * after this 'dev' may point to freed up memory.
2934 if (dev->destructor)
2935 dev->destructor(dev);
2939 printk(KERN_ERR "network todo '%s' but state %d\n",
2940 dev->name, dev->reg_state);
2946 up(&net_todo_run_mutex);
2950 * alloc_netdev - allocate network device
2951 * @sizeof_priv: size of private data to allocate space for
2952 * @name: device name format string
2953 * @setup: callback to initialize device
2955 * Allocates a struct net_device with private data area for driver use
2956 * and performs basic initialization.
2958 struct net_device *alloc_netdev(int sizeof_priv, const char *name,
2959 void (*setup)(struct net_device *))
2962 struct net_device *dev;
2965 /* ensure 32-byte alignment of both the device and private area */
2966 alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
2967 alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
2969 p = kmalloc(alloc_size, GFP_KERNEL);
2971 printk(KERN_ERR "alloc_dev: Unable to allocate device.\n");
2974 memset(p, 0, alloc_size);
2976 dev = (struct net_device *)
2977 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
2978 dev->padded = (char *)dev - (char *)p;
2981 dev->priv = netdev_priv(dev);
2984 strcpy(dev->name, name);
2987 EXPORT_SYMBOL(alloc_netdev);
2990 * free_netdev - free network device
2993 * This function does the last stage of destroying an allocated device
2994 * interface. The reference to the device object is released.
2995 * If this is the last reference then it will be freed.
2997 void free_netdev(struct net_device *dev)
3000 /* Compatiablity with error handling in drivers */
3001 if (dev->reg_state == NETREG_UNINITIALIZED) {
3002 kfree((char *)dev - dev->padded);
3006 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
3007 dev->reg_state = NETREG_RELEASED;
3009 /* will free via class release */
3010 class_device_put(&dev->class_dev);
3012 kfree((char *)dev - dev->padded);
3016 /* Synchronize with packet receive processing. */
3017 void synchronize_net(void)
3024 * unregister_netdevice - remove device from the kernel
3027 * This function shuts down a device interface and removes it
3028 * from the kernel tables. On success 0 is returned, on a failure
3029 * a negative errno code is returned.
3031 * Callers must hold the rtnl semaphore. You may want
3032 * unregister_netdev() instead of this.
3035 int unregister_netdevice(struct net_device *dev)
3037 struct net_device *d, **dp;
3039 BUG_ON(dev_boot_phase);
3042 /* Some devices call without registering for initialization unwind. */
3043 if (dev->reg_state == NETREG_UNINITIALIZED) {
3044 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3045 "was registered\n", dev->name, dev);
3049 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3051 /* If device is running, close it first. */
3052 if (dev->flags & IFF_UP)
3055 /* And unlink it from device chain. */
3056 for (dp = &dev_base; (d = *dp) != NULL; dp = &d->next) {
3058 write_lock_bh(&dev_base_lock);
3059 hlist_del(&dev->name_hlist);
3060 hlist_del(&dev->index_hlist);
3061 if (dev_tail == &dev->next)
3064 write_unlock_bh(&dev_base_lock);
3069 printk(KERN_ERR "unregister net_device: '%s' not found\n",
3074 dev->reg_state = NETREG_UNREGISTERING;
3078 /* Shutdown queueing discipline. */
3082 /* Notify protocols, that we are about to destroy
3083 this device. They should clean all the things.
3085 notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
3088 * Flush the multicast chain
3090 dev_mc_discard(dev);
3095 /* Notifier chain MUST detach us from master device. */
3096 BUG_TRAP(!dev->master);
3098 free_divert_blk(dev);
3100 /* Finish processing unregister after unlock */
3110 * unregister_netdev - remove device from the kernel
3113 * This function shuts down a device interface and removes it
3114 * from the kernel tables. On success 0 is returned, on a failure
3115 * a negative errno code is returned.
3117 * This is just a wrapper for unregister_netdevice that takes
3118 * the rtnl semaphore. In general you want to use this and not
3119 * unregister_netdevice.
3121 void unregister_netdev(struct net_device *dev)
3124 unregister_netdevice(dev);
3128 EXPORT_SYMBOL(unregister_netdev);
3130 #ifdef CONFIG_HOTPLUG_CPU
3131 static int dev_cpu_callback(struct notifier_block *nfb,
3132 unsigned long action,
3135 struct sk_buff **list_skb;
3136 struct net_device **list_net;
3137 struct sk_buff *skb;
3138 unsigned int cpu, oldcpu = (unsigned long)ocpu;
3139 struct softnet_data *sd, *oldsd;
3141 if (action != CPU_DEAD)
3144 local_irq_disable();
3145 cpu = smp_processor_id();
3146 sd = &per_cpu(softnet_data, cpu);
3147 oldsd = &per_cpu(softnet_data, oldcpu);
3149 /* Find end of our completion_queue. */
3150 list_skb = &sd->completion_queue;
3152 list_skb = &(*list_skb)->next;
3153 /* Append completion queue from offline CPU. */
3154 *list_skb = oldsd->completion_queue;
3155 oldsd->completion_queue = NULL;
3157 /* Find end of our output_queue. */
3158 list_net = &sd->output_queue;
3160 list_net = &(*list_net)->next_sched;
3161 /* Append output queue from offline CPU. */
3162 *list_net = oldsd->output_queue;
3163 oldsd->output_queue = NULL;
3165 raise_softirq_irqoff(NET_TX_SOFTIRQ);
3168 /* Process offline CPU's input_pkt_queue */
3169 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
3174 #endif /* CONFIG_HOTPLUG_CPU */
3178 * Initialize the DEV module. At boot time this walks the device list and
3179 * unhooks any devices that fail to initialise (normally hardware not
3180 * present) and leaves us with a valid list of present and active devices.
3185 * This is called single threaded during boot, so no need
3186 * to take the rtnl semaphore.
3188 static int __init net_dev_init(void)
3190 int i, rc = -ENOMEM;
3192 BUG_ON(!dev_boot_phase);
3196 if (dev_proc_init())
3199 if (netdev_sysfs_init())
3202 INIT_LIST_HEAD(&ptype_all);
3203 for (i = 0; i < 16; i++)
3204 INIT_LIST_HEAD(&ptype_base[i]);
3206 for (i = 0; i < ARRAY_SIZE(dev_name_head); i++)
3207 INIT_HLIST_HEAD(&dev_name_head[i]);
3209 for (i = 0; i < ARRAY_SIZE(dev_index_head); i++)
3210 INIT_HLIST_HEAD(&dev_index_head[i]);
3213 * Initialise the packet receive queues.
3216 for (i = 0; i < NR_CPUS; i++) {
3217 struct softnet_data *queue;
3219 queue = &per_cpu(softnet_data, i);
3220 skb_queue_head_init(&queue->input_pkt_queue);
3221 queue->completion_queue = NULL;
3222 INIT_LIST_HEAD(&queue->poll_list);
3223 set_bit(__LINK_STATE_START, &queue->backlog_dev.state);
3224 queue->backlog_dev.weight = weight_p;
3225 queue->backlog_dev.poll = process_backlog;
3226 atomic_set(&queue->backlog_dev.refcnt, 1);
3231 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
3232 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
3234 hotcpu_notifier(dev_cpu_callback, 0);
3242 subsys_initcall(net_dev_init);
3244 EXPORT_SYMBOL(__dev_get_by_index);
3245 EXPORT_SYMBOL(__dev_get_by_name);
3246 EXPORT_SYMBOL(__dev_remove_pack);
3247 EXPORT_SYMBOL(__skb_linearize);
3248 EXPORT_SYMBOL(dev_add_pack);
3249 EXPORT_SYMBOL(dev_alloc_name);
3250 EXPORT_SYMBOL(dev_close);
3251 EXPORT_SYMBOL(dev_get_by_flags);
3252 EXPORT_SYMBOL(dev_get_by_index);
3253 EXPORT_SYMBOL(dev_get_by_name);
3254 EXPORT_SYMBOL(dev_ioctl);
3255 EXPORT_SYMBOL(dev_open);
3256 EXPORT_SYMBOL(dev_queue_xmit);
3257 EXPORT_SYMBOL(dev_remove_pack);
3258 EXPORT_SYMBOL(dev_set_allmulti);
3259 EXPORT_SYMBOL(dev_set_promiscuity);
3260 EXPORT_SYMBOL(dev_change_flags);
3261 EXPORT_SYMBOL(dev_set_mtu);
3262 EXPORT_SYMBOL(dev_set_mac_address);
3263 EXPORT_SYMBOL(free_netdev);
3264 EXPORT_SYMBOL(netdev_boot_setup_check);
3265 EXPORT_SYMBOL(netdev_set_master);
3266 EXPORT_SYMBOL(netdev_state_change);
3267 EXPORT_SYMBOL(netif_receive_skb);
3268 EXPORT_SYMBOL(netif_rx);
3269 EXPORT_SYMBOL(register_gifconf);
3270 EXPORT_SYMBOL(register_netdevice);
3271 EXPORT_SYMBOL(register_netdevice_notifier);
3272 EXPORT_SYMBOL(skb_checksum_help);
3273 EXPORT_SYMBOL(synchronize_net);
3274 EXPORT_SYMBOL(unregister_netdevice);
3275 EXPORT_SYMBOL(unregister_netdevice_notifier);
3276 EXPORT_SYMBOL(net_enable_timestamp);
3277 EXPORT_SYMBOL(net_disable_timestamp);
3278 EXPORT_SYMBOL(dev_get_flags);
3280 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
3281 EXPORT_SYMBOL(br_handle_frame_hook);
3282 EXPORT_SYMBOL(br_fdb_get_hook);
3283 EXPORT_SYMBOL(br_fdb_put_hook);
3287 EXPORT_SYMBOL(dev_load);
3290 EXPORT_PER_CPU_SYMBOL(softnet_data);