2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/sched.h>
83 #include <linux/mutex.h>
84 #include <linux/string.h>
86 #include <linux/socket.h>
87 #include <linux/sockios.h>
88 #include <linux/errno.h>
89 #include <linux/interrupt.h>
90 #include <linux/if_ether.h>
91 #include <linux/netdevice.h>
92 #include <linux/etherdevice.h>
93 #include <linux/notifier.h>
94 #include <linux/skbuff.h>
96 #include <linux/rtnetlink.h>
97 #include <linux/proc_fs.h>
98 #include <linux/seq_file.h>
99 #include <linux/stat.h>
100 #include <linux/if_bridge.h>
101 #include <linux/divert.h>
103 #include <net/pkt_sched.h>
104 #include <net/checksum.h>
105 #include <linux/highmem.h>
106 #include <linux/init.h>
107 #include <linux/kmod.h>
108 #include <linux/module.h>
109 #include <linux/kallsyms.h>
110 #include <linux/netpoll.h>
111 #include <linux/rcupdate.h>
112 #include <linux/delay.h>
113 #include <linux/wireless.h>
114 #include <net/iw_handler.h>
115 #include <asm/current.h>
116 #include <linux/audit.h>
117 #include <linux/dmaengine.h>
118 #include <linux/err.h>
119 #include <linux/ctype.h>
120 #include <linux/vs_network.h>
124 #include <linux/tcp.h>
125 #include <linux/udp.h>
129 * The list of packet types we will receive (as opposed to discard)
130 * and the routines to invoke.
132 * Why 16. Because with 16 the only overlap we get on a hash of the
133 * low nibble of the protocol value is RARP/SNAP/X.25.
135 * NOTE: That is no longer true with the addition of VLAN tags. Not
136 * sure which should go first, but I bet it won't make much
137 * difference if we are running VLANs. The good news is that
138 * this protocol won't be in the list unless compiled in, so
139 * the average user (w/out VLANs) will not be adversely affected.
156 static DEFINE_SPINLOCK(ptype_lock);
157 static struct list_head ptype_base[16]; /* 16 way hashed list */
158 static struct list_head ptype_all; /* Taps */
160 #ifdef CONFIG_NET_DMA
161 static struct dma_client *net_dma_client;
162 static unsigned int net_dma_count;
163 static spinlock_t net_dma_event_lock;
167 * The @dev_base list is protected by @dev_base_lock and the rtnl
170 * Pure readers hold dev_base_lock for reading.
172 * Writers must hold the rtnl semaphore while they loop through the
173 * dev_base list, and hold dev_base_lock for writing when they do the
174 * actual updates. This allows pure readers to access the list even
175 * while a writer is preparing to update it.
177 * To put it another way, dev_base_lock is held for writing only to
178 * protect against pure readers; the rtnl semaphore provides the
179 * protection against other writers.
181 * See, for example usages, register_netdevice() and
182 * unregister_netdevice(), which must be called with the rtnl
185 struct net_device *dev_base;
186 static struct net_device **dev_tail = &dev_base;
187 DEFINE_RWLOCK(dev_base_lock);
189 EXPORT_SYMBOL(dev_base);
190 EXPORT_SYMBOL(dev_base_lock);
192 #define NETDEV_HASHBITS 8
193 static struct hlist_head dev_name_head[1<<NETDEV_HASHBITS];
194 static struct hlist_head dev_index_head[1<<NETDEV_HASHBITS];
196 static inline struct hlist_head *dev_name_hash(const char *name)
198 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
199 return &dev_name_head[hash & ((1<<NETDEV_HASHBITS)-1)];
202 static inline struct hlist_head *dev_index_hash(int ifindex)
204 return &dev_index_head[ifindex & ((1<<NETDEV_HASHBITS)-1)];
211 static RAW_NOTIFIER_HEAD(netdev_chain);
214 * Device drivers call our routines to queue packets here. We empty the
215 * queue in the local softnet handler.
217 DEFINE_PER_CPU(struct softnet_data, softnet_data) = { NULL };
220 extern int netdev_sysfs_init(void);
221 extern int netdev_register_sysfs(struct net_device *);
222 extern void netdev_unregister_sysfs(struct net_device *);
224 #define netdev_sysfs_init() (0)
225 #define netdev_register_sysfs(dev) (0)
226 #define netdev_unregister_sysfs(dev) do { } while(0)
230 /*******************************************************************************
232 Protocol management and registration routines
234 *******************************************************************************/
240 static int netdev_nit;
243 * Add a protocol ID to the list. Now that the input handler is
244 * smarter we can dispense with all the messy stuff that used to be
247 * BEWARE!!! Protocol handlers, mangling input packets,
248 * MUST BE last in hash buckets and checking protocol handlers
249 * MUST start from promiscuous ptype_all chain in net_bh.
250 * It is true now, do not change it.
251 * Explanation follows: if protocol handler, mangling packet, will
252 * be the first on list, it is not able to sense, that packet
253 * is cloned and should be copied-on-write, so that it will
254 * change it and subsequent readers will get broken packet.
259 * dev_add_pack - add packet handler
260 * @pt: packet type declaration
262 * Add a protocol handler to the networking stack. The passed &packet_type
263 * is linked into kernel lists and may not be freed until it has been
264 * removed from the kernel lists.
266 * This call does not sleep therefore it can not
267 * guarantee all CPU's that are in middle of receiving packets
268 * will see the new packet type (until the next received packet).
271 void dev_add_pack(struct packet_type *pt)
275 spin_lock_bh(&ptype_lock);
276 if (pt->type == htons(ETH_P_ALL)) {
278 list_add_rcu(&pt->list, &ptype_all);
280 hash = ntohs(pt->type) & 15;
281 list_add_rcu(&pt->list, &ptype_base[hash]);
283 spin_unlock_bh(&ptype_lock);
287 * __dev_remove_pack - remove packet handler
288 * @pt: packet type declaration
290 * Remove a protocol handler that was previously added to the kernel
291 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
292 * from the kernel lists and can be freed or reused once this function
295 * The packet type might still be in use by receivers
296 * and must not be freed until after all the CPU's have gone
297 * through a quiescent state.
299 void __dev_remove_pack(struct packet_type *pt)
301 struct list_head *head;
302 struct packet_type *pt1;
304 spin_lock_bh(&ptype_lock);
306 if (pt->type == htons(ETH_P_ALL)) {
310 head = &ptype_base[ntohs(pt->type) & 15];
312 list_for_each_entry(pt1, head, list) {
314 list_del_rcu(&pt->list);
319 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
321 spin_unlock_bh(&ptype_lock);
324 * dev_remove_pack - remove packet handler
325 * @pt: packet type declaration
327 * Remove a protocol handler that was previously added to the kernel
328 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
329 * from the kernel lists and can be freed or reused once this function
332 * This call sleeps to guarantee that no CPU is looking at the packet
335 void dev_remove_pack(struct packet_type *pt)
337 __dev_remove_pack(pt);
342 /******************************************************************************
344 Device Boot-time Settings Routines
346 *******************************************************************************/
348 /* Boot time configuration table */
349 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
352 * netdev_boot_setup_add - add new setup entry
353 * @name: name of the device
354 * @map: configured settings for the device
356 * Adds new setup entry to the dev_boot_setup list. The function
357 * returns 0 on error and 1 on success. This is a generic routine to
360 static int netdev_boot_setup_add(char *name, struct ifmap *map)
362 struct netdev_boot_setup *s;
366 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
367 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
368 memset(s[i].name, 0, sizeof(s[i].name));
369 strcpy(s[i].name, name);
370 memcpy(&s[i].map, map, sizeof(s[i].map));
375 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
379 * netdev_boot_setup_check - check boot time settings
380 * @dev: the netdevice
382 * Check boot time settings for the device.
383 * The found settings are set for the device to be used
384 * later in the device probing.
385 * Returns 0 if no settings found, 1 if they are.
387 int netdev_boot_setup_check(struct net_device *dev)
389 struct netdev_boot_setup *s = dev_boot_setup;
392 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
393 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
394 !strncmp(dev->name, s[i].name, strlen(s[i].name))) {
395 dev->irq = s[i].map.irq;
396 dev->base_addr = s[i].map.base_addr;
397 dev->mem_start = s[i].map.mem_start;
398 dev->mem_end = s[i].map.mem_end;
407 * netdev_boot_base - get address from boot time settings
408 * @prefix: prefix for network device
409 * @unit: id for network device
411 * Check boot time settings for the base address of device.
412 * The found settings are set for the device to be used
413 * later in the device probing.
414 * Returns 0 if no settings found.
416 unsigned long netdev_boot_base(const char *prefix, int unit)
418 const struct netdev_boot_setup *s = dev_boot_setup;
422 sprintf(name, "%s%d", prefix, unit);
425 * If device already registered then return base of 1
426 * to indicate not to probe for this interface
428 if (__dev_get_by_name(name))
431 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
432 if (!strcmp(name, s[i].name))
433 return s[i].map.base_addr;
438 * Saves at boot time configured settings for any netdevice.
440 int __init netdev_boot_setup(char *str)
445 str = get_options(str, ARRAY_SIZE(ints), ints);
450 memset(&map, 0, sizeof(map));
454 map.base_addr = ints[2];
456 map.mem_start = ints[3];
458 map.mem_end = ints[4];
460 /* Add new entry to the list */
461 return netdev_boot_setup_add(str, &map);
464 __setup("netdev=", netdev_boot_setup);
466 /*******************************************************************************
468 Device Interface Subroutines
470 *******************************************************************************/
473 * __dev_get_by_name - find a device by its name
474 * @name: name to find
476 * Find an interface by name. Must be called under RTNL semaphore
477 * or @dev_base_lock. If the name is found a pointer to the device
478 * is returned. If the name is not found then %NULL is returned. The
479 * reference counters are not incremented so the caller must be
480 * careful with locks.
483 struct net_device *__dev_get_by_name(const char *name)
485 struct hlist_node *p;
487 hlist_for_each(p, dev_name_hash(name)) {
488 struct net_device *dev
489 = hlist_entry(p, struct net_device, name_hlist);
490 if (!strncmp(dev->name, name, IFNAMSIZ))
497 * dev_get_by_name - find a device by its name
498 * @name: name to find
500 * Find an interface by name. This can be called from any
501 * context and does its own locking. The returned handle has
502 * the usage count incremented and the caller must use dev_put() to
503 * release it when it is no longer needed. %NULL is returned if no
504 * matching device is found.
507 struct net_device *dev_get_by_name(const char *name)
509 struct net_device *dev;
511 read_lock(&dev_base_lock);
512 dev = __dev_get_by_name(name);
515 read_unlock(&dev_base_lock);
520 * __dev_get_by_index - find a device by its ifindex
521 * @ifindex: index of device
523 * Search for an interface by index. Returns %NULL if the device
524 * is not found or a pointer to the device. The device has not
525 * had its reference counter increased so the caller must be careful
526 * about locking. The caller must hold either the RTNL semaphore
530 struct net_device *__dev_get_by_index(int ifindex)
532 struct hlist_node *p;
534 hlist_for_each(p, dev_index_hash(ifindex)) {
535 struct net_device *dev
536 = hlist_entry(p, struct net_device, index_hlist);
537 if (dev->ifindex == ifindex)
545 * dev_get_by_index - find a device by its ifindex
546 * @ifindex: index of device
548 * Search for an interface by index. Returns NULL if the device
549 * is not found or a pointer to the device. The device returned has
550 * had a reference added and the pointer is safe until the user calls
551 * dev_put to indicate they have finished with it.
554 struct net_device *dev_get_by_index(int ifindex)
556 struct net_device *dev;
558 read_lock(&dev_base_lock);
559 dev = __dev_get_by_index(ifindex);
562 read_unlock(&dev_base_lock);
567 * dev_getbyhwaddr - find a device by its hardware address
568 * @type: media type of device
569 * @ha: hardware address
571 * Search for an interface by MAC address. Returns NULL if the device
572 * is not found or a pointer to the device. The caller must hold the
573 * rtnl semaphore. The returned device has not had its ref count increased
574 * and the caller must therefore be careful about locking
577 * If the API was consistent this would be __dev_get_by_hwaddr
580 struct net_device *dev_getbyhwaddr(unsigned short type, char *ha)
582 struct net_device *dev;
586 for (dev = dev_base; dev; dev = dev->next)
587 if (dev->type == type &&
588 !memcmp(dev->dev_addr, ha, dev->addr_len))
593 EXPORT_SYMBOL(dev_getbyhwaddr);
595 struct net_device *dev_getfirstbyhwtype(unsigned short type)
597 struct net_device *dev;
600 for (dev = dev_base; dev; dev = dev->next) {
601 if (dev->type == type) {
610 EXPORT_SYMBOL(dev_getfirstbyhwtype);
613 * dev_get_by_flags - find any device with given flags
614 * @if_flags: IFF_* values
615 * @mask: bitmask of bits in if_flags to check
617 * Search for any interface with the given flags. Returns NULL if a device
618 * is not found or a pointer to the device. The device returned has
619 * had a reference added and the pointer is safe until the user calls
620 * dev_put to indicate they have finished with it.
623 struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mask)
625 struct net_device *dev;
627 read_lock(&dev_base_lock);
628 for (dev = dev_base; dev != NULL; dev = dev->next) {
629 if (((dev->flags ^ if_flags) & mask) == 0) {
634 read_unlock(&dev_base_lock);
639 * dev_valid_name - check if name is okay for network device
642 * Network device names need to be valid file names to
643 * to allow sysfs to work. We also disallow any kind of
646 int dev_valid_name(const char *name)
650 if (!strcmp(name, ".") || !strcmp(name, ".."))
654 if (*name == '/' || isspace(*name))
662 * dev_alloc_name - allocate a name for a device
664 * @name: name format string
666 * Passed a format string - eg "lt%d" it will try and find a suitable
667 * id. It scans list of devices to build up a free map, then chooses
668 * the first empty slot. The caller must hold the dev_base or rtnl lock
669 * while allocating the name and adding the device in order to avoid
671 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
672 * Returns the number of the unit assigned or a negative errno code.
675 int dev_alloc_name(struct net_device *dev, const char *name)
680 const int max_netdevices = 8*PAGE_SIZE;
682 struct net_device *d;
684 p = strnchr(name, IFNAMSIZ-1, '%');
687 * Verify the string as this thing may have come from
688 * the user. There must be either one "%d" and no other "%"
691 if (p[1] != 'd' || strchr(p + 2, '%'))
694 /* Use one page as a bit array of possible slots */
695 inuse = (long *) get_zeroed_page(GFP_ATOMIC);
699 for (d = dev_base; d; d = d->next) {
700 if (!sscanf(d->name, name, &i))
702 if (i < 0 || i >= max_netdevices)
705 /* avoid cases where sscanf is not exact inverse of printf */
706 snprintf(buf, sizeof(buf), name, i);
707 if (!strncmp(buf, d->name, IFNAMSIZ))
711 i = find_first_zero_bit(inuse, max_netdevices);
712 free_page((unsigned long) inuse);
715 snprintf(buf, sizeof(buf), name, i);
716 if (!__dev_get_by_name(buf)) {
717 strlcpy(dev->name, buf, IFNAMSIZ);
721 /* It is possible to run out of possible slots
722 * when the name is long and there isn't enough space left
723 * for the digits, or if all bits are used.
730 * dev_change_name - change name of a device
732 * @newname: name (or format string) must be at least IFNAMSIZ
734 * Change name of a device, can pass format strings "eth%d".
737 int dev_change_name(struct net_device *dev, char *newname)
743 if (dev->flags & IFF_UP)
746 if (!dev_valid_name(newname))
749 if (strchr(newname, '%')) {
750 err = dev_alloc_name(dev, newname);
753 strcpy(newname, dev->name);
755 else if (__dev_get_by_name(newname))
758 strlcpy(dev->name, newname, IFNAMSIZ);
760 err = class_device_rename(&dev->class_dev, dev->name);
762 hlist_del(&dev->name_hlist);
763 hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name));
764 raw_notifier_call_chain(&netdev_chain,
765 NETDEV_CHANGENAME, dev);
772 * netdev_features_change - device changes features
773 * @dev: device to cause notification
775 * Called to indicate a device has changed features.
777 void netdev_features_change(struct net_device *dev)
779 raw_notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
781 EXPORT_SYMBOL(netdev_features_change);
784 * netdev_state_change - device changes state
785 * @dev: device to cause notification
787 * Called to indicate a device has changed state. This function calls
788 * the notifier chains for netdev_chain and sends a NEWLINK message
789 * to the routing socket.
791 void netdev_state_change(struct net_device *dev)
793 if (dev->flags & IFF_UP) {
794 raw_notifier_call_chain(&netdev_chain,
796 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
801 * dev_load - load a network module
802 * @name: name of interface
804 * If a network interface is not present and the process has suitable
805 * privileges this function loads the module. If module loading is not
806 * available in this kernel then it becomes a nop.
809 void dev_load(const char *name)
811 struct net_device *dev;
813 read_lock(&dev_base_lock);
814 dev = __dev_get_by_name(name);
815 read_unlock(&dev_base_lock);
817 if (!dev && capable(CAP_SYS_MODULE))
818 request_module("%s", name);
821 static int default_rebuild_header(struct sk_buff *skb)
823 printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
824 skb->dev ? skb->dev->name : "NULL!!!");
831 * dev_open - prepare an interface for use.
832 * @dev: device to open
834 * Takes a device from down to up state. The device's private open
835 * function is invoked and then the multicast lists are loaded. Finally
836 * the device is moved into the up state and a %NETDEV_UP message is
837 * sent to the netdev notifier chain.
839 * Calling this function on an active interface is a nop. On a failure
840 * a negative errno code is returned.
842 int dev_open(struct net_device *dev)
850 if (dev->flags & IFF_UP)
854 * Is it even present?
856 if (!netif_device_present(dev))
860 * Call device private open method
862 set_bit(__LINK_STATE_START, &dev->state);
864 ret = dev->open(dev);
866 clear_bit(__LINK_STATE_START, &dev->state);
870 * If it went open OK then:
877 dev->flags |= IFF_UP;
880 * Initialize multicasting status
885 * Wakeup transmit queue engine
890 * ... and announce new interface.
892 raw_notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
898 * dev_close - shutdown an interface.
899 * @dev: device to shutdown
901 * This function moves an active device into down state. A
902 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
903 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
906 int dev_close(struct net_device *dev)
908 if (!(dev->flags & IFF_UP))
912 * Tell people we are going down, so that they can
913 * prepare to death, when device is still operating.
915 raw_notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
919 clear_bit(__LINK_STATE_START, &dev->state);
921 /* Synchronize to scheduled poll. We cannot touch poll list,
922 * it can be even on different cpu. So just clear netif_running(),
923 * and wait when poll really will happen. Actually, the best place
924 * for this is inside dev->stop() after device stopped its irq
925 * engine, but this requires more changes in devices. */
927 smp_mb__after_clear_bit(); /* Commit netif_running(). */
928 while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
934 * Call the device specific close. This cannot fail.
935 * Only if device is UP
937 * We allow it to be called even after a DETACH hot-plug
944 * Device is now down.
947 dev->flags &= ~IFF_UP;
950 * Tell people we are down
952 raw_notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
959 * Device change register/unregister. These are not inline or static
960 * as we export them to the world.
964 * register_netdevice_notifier - register a network notifier block
967 * Register a notifier to be called when network device events occur.
968 * The notifier passed is linked into the kernel structures and must
969 * not be reused until it has been unregistered. A negative errno code
970 * is returned on a failure.
972 * When registered all registration and up events are replayed
973 * to the new notifier to allow device to have a race free
974 * view of the network device list.
977 int register_netdevice_notifier(struct notifier_block *nb)
979 struct net_device *dev;
983 err = raw_notifier_chain_register(&netdev_chain, nb);
985 for (dev = dev_base; dev; dev = dev->next) {
986 nb->notifier_call(nb, NETDEV_REGISTER, dev);
988 if (dev->flags & IFF_UP)
989 nb->notifier_call(nb, NETDEV_UP, dev);
997 * unregister_netdevice_notifier - unregister a network notifier block
1000 * Unregister a notifier previously registered by
1001 * register_netdevice_notifier(). The notifier is unlinked into the
1002 * kernel structures and may then be reused. A negative errno code
1003 * is returned on a failure.
1006 int unregister_netdevice_notifier(struct notifier_block *nb)
1011 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1017 * call_netdevice_notifiers - call all network notifier blocks
1018 * @val: value passed unmodified to notifier function
1019 * @v: pointer passed unmodified to notifier function
1021 * Call all network notifier blocks. Parameters and return value
1022 * are as for raw_notifier_call_chain().
1025 int call_netdevice_notifiers(unsigned long val, void *v)
1027 return raw_notifier_call_chain(&netdev_chain, val, v);
1030 /* When > 0 there are consumers of rx skb time stamps */
1031 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1033 void net_enable_timestamp(void)
1035 atomic_inc(&netstamp_needed);
1038 void net_disable_timestamp(void)
1040 atomic_dec(&netstamp_needed);
1043 void __net_timestamp(struct sk_buff *skb)
1047 do_gettimeofday(&tv);
1048 skb_set_timestamp(skb, &tv);
1050 EXPORT_SYMBOL(__net_timestamp);
1052 static inline void net_timestamp(struct sk_buff *skb)
1054 if (atomic_read(&netstamp_needed))
1055 __net_timestamp(skb);
1057 skb->tstamp.off_sec = 0;
1058 skb->tstamp.off_usec = 0;
1063 * Support routine. Sends outgoing frames to any network
1064 * taps currently in use.
1067 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1069 struct packet_type *ptype;
1074 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1075 /* Never send packets back to the socket
1076 * they originated from - MvS (miquels@drinkel.ow.org)
1078 if ((ptype->dev == dev || !ptype->dev) &&
1079 (ptype->af_packet_priv == NULL ||
1080 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1081 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1085 /* skb->nh should be correctly
1086 set by sender, so that the second statement is
1087 just protection against buggy protocols.
1089 skb2->mac.raw = skb2->data;
1091 if (skb2->nh.raw < skb2->data ||
1092 skb2->nh.raw > skb2->tail) {
1093 if (net_ratelimit())
1094 printk(KERN_CRIT "protocol %04x is "
1096 skb2->protocol, dev->name);
1097 skb2->nh.raw = skb2->data;
1100 skb2->h.raw = skb2->nh.raw;
1101 skb2->pkt_type = PACKET_OUTGOING;
1102 ptype->func(skb2, skb->dev, ptype, skb->dev);
1109 void __netif_schedule(struct net_device *dev)
1111 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
1112 unsigned long flags;
1113 struct softnet_data *sd;
1115 local_irq_save(flags);
1116 sd = &__get_cpu_var(softnet_data);
1117 dev->next_sched = sd->output_queue;
1118 sd->output_queue = dev;
1119 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1120 local_irq_restore(flags);
1123 EXPORT_SYMBOL(__netif_schedule);
1125 void __netif_rx_schedule(struct net_device *dev)
1127 unsigned long flags;
1129 local_irq_save(flags);
1131 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
1133 dev->quota += dev->weight;
1135 dev->quota = dev->weight;
1136 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
1137 local_irq_restore(flags);
1139 EXPORT_SYMBOL(__netif_rx_schedule);
1141 void dev_kfree_skb_any(struct sk_buff *skb)
1143 if (in_irq() || irqs_disabled())
1144 dev_kfree_skb_irq(skb);
1148 EXPORT_SYMBOL(dev_kfree_skb_any);
1152 void netif_device_detach(struct net_device *dev)
1154 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1155 netif_running(dev)) {
1156 netif_stop_queue(dev);
1159 EXPORT_SYMBOL(netif_device_detach);
1161 void netif_device_attach(struct net_device *dev)
1163 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1164 netif_running(dev)) {
1165 netif_wake_queue(dev);
1166 __netdev_watchdog_up(dev);
1169 EXPORT_SYMBOL(netif_device_attach);
1173 * Invalidate hardware checksum when packet is to be mangled, and
1174 * complete checksum manually on outgoing path.
1176 int skb_checksum_help(struct sk_buff *skb, int inward)
1179 int ret = 0, offset = skb->h.raw - skb->data;
1182 goto out_set_summed;
1184 if (unlikely(skb_shinfo(skb)->gso_size)) {
1185 /* Let GSO fix up the checksum. */
1186 goto out_set_summed;
1189 if (skb_cloned(skb)) {
1190 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1195 BUG_ON(offset > (int)skb->len);
1196 csum = skb_checksum(skb, offset, skb->len-offset, 0);
1198 offset = skb->tail - skb->h.raw;
1199 BUG_ON(offset <= 0);
1200 BUG_ON(skb->csum + 2 > offset);
1202 *(u16*)(skb->h.raw + skb->csum) = csum_fold(csum);
1205 skb->ip_summed = CHECKSUM_NONE;
1211 * skb_gso_segment - Perform segmentation on skb.
1212 * @skb: buffer to segment
1213 * @features: features for the output path (see dev->features)
1215 * This function segments the given skb and returns a list of segments.
1217 * It may return NULL if the skb requires no segmentation. This is
1218 * only possible when GSO is used for verifying header integrity.
1220 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1222 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1223 struct packet_type *ptype;
1224 int type = skb->protocol;
1227 BUG_ON(skb_shinfo(skb)->frag_list);
1229 skb->mac.raw = skb->data;
1230 skb->mac_len = skb->nh.raw - skb->data;
1231 __skb_pull(skb, skb->mac_len);
1233 if (unlikely(skb->ip_summed != CHECKSUM_HW)) {
1234 if (skb_header_cloned(skb) &&
1235 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1236 return ERR_PTR(err);
1240 list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type) & 15], list) {
1241 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1242 if (unlikely(skb->ip_summed != CHECKSUM_HW)) {
1243 err = ptype->gso_send_check(skb);
1244 segs = ERR_PTR(err);
1245 if (err || skb_gso_ok(skb, features))
1247 __skb_push(skb, skb->data - skb->nh.raw);
1249 segs = ptype->gso_segment(skb, features);
1255 __skb_push(skb, skb->data - skb->mac.raw);
1260 EXPORT_SYMBOL(skb_gso_segment);
1262 /* Take action when hardware reception checksum errors are detected. */
1264 void netdev_rx_csum_fault(struct net_device *dev)
1266 if (net_ratelimit()) {
1267 printk(KERN_ERR "%s: hw csum failure.\n",
1268 dev ? dev->name : "<unknown>");
1272 EXPORT_SYMBOL(netdev_rx_csum_fault);
1275 /* Actually, we should eliminate this check as soon as we know, that:
1276 * 1. IOMMU is present and allows to map all the memory.
1277 * 2. No high memory really exists on this machine.
1280 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1282 #ifdef CONFIG_HIGHMEM
1285 if (dev->features & NETIF_F_HIGHDMA)
1288 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1289 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1297 void (*destructor)(struct sk_buff *skb);
1300 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1302 static void dev_gso_skb_destructor(struct sk_buff *skb)
1304 struct dev_gso_cb *cb;
1307 struct sk_buff *nskb = skb->next;
1309 skb->next = nskb->next;
1312 } while (skb->next);
1314 cb = DEV_GSO_CB(skb);
1316 cb->destructor(skb);
1320 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1321 * @skb: buffer to segment
1323 * This function segments the given skb and stores the list of segments
1326 static int dev_gso_segment(struct sk_buff *skb)
1328 struct net_device *dev = skb->dev;
1329 struct sk_buff *segs;
1330 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1333 segs = skb_gso_segment(skb, features);
1335 /* Verifying header integrity only. */
1339 if (unlikely(IS_ERR(segs)))
1340 return PTR_ERR(segs);
1343 DEV_GSO_CB(skb)->destructor = skb->destructor;
1344 skb->destructor = dev_gso_skb_destructor;
1349 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
1351 if (likely(!skb->next)) {
1353 dev_queue_xmit_nit(skb, dev);
1355 if (netif_needs_gso(dev, skb)) {
1356 if (unlikely(dev_gso_segment(skb)))
1362 return dev->hard_start_xmit(skb, dev);
1367 struct sk_buff *nskb = skb->next;
1370 skb->next = nskb->next;
1372 rc = dev->hard_start_xmit(nskb, dev);
1374 nskb->next = skb->next;
1378 if (unlikely(netif_queue_stopped(dev) && skb->next))
1379 return NETDEV_TX_BUSY;
1380 } while (skb->next);
1382 skb->destructor = DEV_GSO_CB(skb)->destructor;
1389 #define HARD_TX_LOCK(dev, cpu) { \
1390 if ((dev->features & NETIF_F_LLTX) == 0) { \
1391 netif_tx_lock(dev); \
1395 #define HARD_TX_UNLOCK(dev) { \
1396 if ((dev->features & NETIF_F_LLTX) == 0) { \
1397 netif_tx_unlock(dev); \
1402 inline int skb_checksum_setup(struct sk_buff *skb)
1404 if (skb->proto_csum_blank) {
1405 if (skb->protocol != htons(ETH_P_IP))
1407 skb->h.raw = (unsigned char *)skb->nh.iph + 4*skb->nh.iph->ihl;
1408 if (skb->h.raw >= skb->tail)
1410 switch (skb->nh.iph->protocol) {
1412 skb->csum = offsetof(struct tcphdr, check);
1415 skb->csum = offsetof(struct udphdr, check);
1418 if (net_ratelimit())
1419 printk(KERN_ERR "Attempting to checksum a non-"
1420 "TCP/UDP packet, dropping a protocol"
1421 " %d packet", skb->nh.iph->protocol);
1424 if ((skb->h.raw + skb->csum + 2) > skb->tail)
1426 skb->ip_summed = CHECKSUM_HW;
1427 skb->proto_csum_blank = 0;
1434 inline int skb_checksum_setup(struct sk_buff *skb) { return 0; }
1439 * dev_queue_xmit - transmit a buffer
1440 * @skb: buffer to transmit
1442 * Queue a buffer for transmission to a network device. The caller must
1443 * have set the device and priority and built the buffer before calling
1444 * this function. The function can be called from an interrupt.
1446 * A negative errno code is returned on a failure. A success does not
1447 * guarantee the frame will be transmitted as it may be dropped due
1448 * to congestion or traffic shaping.
1450 * -----------------------------------------------------------------------------------
1451 * I notice this method can also return errors from the queue disciplines,
1452 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1455 * Regardless of the return value, the skb is consumed, so it is currently
1456 * difficult to retry a send to this method. (You can bump the ref count
1457 * before sending to hold a reference for retry if you are careful.)
1459 * When calling this method, interrupts MUST be enabled. This is because
1460 * the BH enable code must have IRQs enabled so that it will not deadlock.
1464 int dev_queue_xmit(struct sk_buff *skb)
1466 struct net_device *dev = skb->dev;
1470 /* If a checksum-deferred packet is forwarded to a device that needs a
1471 * checksum, correct the pointers and force checksumming.
1473 if (skb_checksum_setup(skb))
1476 /* GSO will handle the following emulations directly. */
1477 if (netif_needs_gso(dev, skb))
1480 if (skb_shinfo(skb)->frag_list &&
1481 !(dev->features & NETIF_F_FRAGLIST) &&
1482 __skb_linearize(skb))
1485 /* Fragmented skb is linearized if device does not support SG,
1486 * or if at least one of fragments is in highmem and device
1487 * does not support DMA from it.
1489 if (skb_shinfo(skb)->nr_frags &&
1490 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1491 __skb_linearize(skb))
1494 /* If packet is not checksummed and device does not support
1495 * checksumming for this protocol, complete checksumming here.
1497 if (skb->ip_summed == CHECKSUM_HW &&
1498 (!(dev->features & NETIF_F_GEN_CSUM) &&
1499 (!(dev->features & NETIF_F_IP_CSUM) ||
1500 skb->protocol != htons(ETH_P_IP))))
1501 if (skb_checksum_help(skb, 0))
1505 spin_lock_prefetch(&dev->queue_lock);
1507 /* Disable soft irqs for various locks below. Also
1508 * stops preemption for RCU.
1512 /* Updates of qdisc are serialized by queue_lock.
1513 * The struct Qdisc which is pointed to by qdisc is now a
1514 * rcu structure - it may be accessed without acquiring
1515 * a lock (but the structure may be stale.) The freeing of the
1516 * qdisc will be deferred until it's known that there are no
1517 * more references to it.
1519 * If the qdisc has an enqueue function, we still need to
1520 * hold the queue_lock before calling it, since queue_lock
1521 * also serializes access to the device queue.
1524 q = rcu_dereference(dev->qdisc);
1525 #ifdef CONFIG_NET_CLS_ACT
1526 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1529 /* Grab device queue */
1530 spin_lock(&dev->queue_lock);
1533 rc = q->enqueue(skb, q);
1535 spin_unlock(&dev->queue_lock);
1537 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1540 spin_unlock(&dev->queue_lock);
1543 /* The device has no queue. Common case for software devices:
1544 loopback, all the sorts of tunnels...
1546 Really, it is unlikely that netif_tx_lock protection is necessary
1547 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1549 However, it is possible, that they rely on protection
1552 Check this and shot the lock. It is not prone from deadlocks.
1553 Either shot noqueue qdisc, it is even simpler 8)
1555 if (dev->flags & IFF_UP) {
1556 int cpu = smp_processor_id(); /* ok because BHs are off */
1558 if (dev->xmit_lock_owner != cpu) {
1560 HARD_TX_LOCK(dev, cpu);
1562 if (!netif_queue_stopped(dev)) {
1564 if (!dev_hard_start_xmit(skb, dev)) {
1565 HARD_TX_UNLOCK(dev);
1569 HARD_TX_UNLOCK(dev);
1570 if (net_ratelimit())
1571 printk(KERN_CRIT "Virtual device %s asks to "
1572 "queue packet!\n", dev->name);
1574 /* Recursion is detected! It is possible,
1576 if (net_ratelimit())
1577 printk(KERN_CRIT "Dead loop on virtual device "
1578 "%s, fix it urgently!\n", dev->name);
1583 rcu_read_unlock_bh();
1589 rcu_read_unlock_bh();
1594 /*=======================================================================
1596 =======================================================================*/
1598 int netdev_max_backlog = 1000;
1599 int netdev_budget = 300;
1600 int weight_p = 64; /* old backlog weight */
1602 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1606 * netif_rx - post buffer to the network code
1607 * @skb: buffer to post
1609 * This function receives a packet from a device driver and queues it for
1610 * the upper (protocol) levels to process. It always succeeds. The buffer
1611 * may be dropped during processing for congestion control or by the
1615 * NET_RX_SUCCESS (no congestion)
1616 * NET_RX_CN_LOW (low congestion)
1617 * NET_RX_CN_MOD (moderate congestion)
1618 * NET_RX_CN_HIGH (high congestion)
1619 * NET_RX_DROP (packet was dropped)
1623 int netif_rx(struct sk_buff *skb)
1625 struct softnet_data *queue;
1626 unsigned long flags;
1628 /* if netpoll wants it, pretend we never saw it */
1629 if (netpoll_rx(skb))
1632 if (!skb->tstamp.off_sec)
1636 * The code is rearranged so that the path is the most
1637 * short when CPU is congested, but is still operating.
1639 local_irq_save(flags);
1640 queue = &__get_cpu_var(softnet_data);
1642 __get_cpu_var(netdev_rx_stat).total++;
1643 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1644 if (queue->input_pkt_queue.qlen) {
1647 __skb_queue_tail(&queue->input_pkt_queue, skb);
1648 local_irq_restore(flags);
1649 return NET_RX_SUCCESS;
1652 netif_rx_schedule(&queue->backlog_dev);
1656 __get_cpu_var(netdev_rx_stat).dropped++;
1657 local_irq_restore(flags);
1663 int netif_rx_ni(struct sk_buff *skb)
1668 err = netif_rx(skb);
1669 if (local_softirq_pending())
1676 EXPORT_SYMBOL(netif_rx_ni);
1678 static inline struct net_device *skb_bond(struct sk_buff *skb)
1680 struct net_device *dev = skb->dev;
1683 if (skb_bond_should_drop(skb)) {
1687 skb->dev = dev->master;
1693 static void net_tx_action(struct softirq_action *h)
1695 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1697 if (sd->completion_queue) {
1698 struct sk_buff *clist;
1700 local_irq_disable();
1701 clist = sd->completion_queue;
1702 sd->completion_queue = NULL;
1706 struct sk_buff *skb = clist;
1707 clist = clist->next;
1709 BUG_TRAP(!atomic_read(&skb->users));
1714 if (sd->output_queue) {
1715 struct net_device *head;
1717 local_irq_disable();
1718 head = sd->output_queue;
1719 sd->output_queue = NULL;
1723 struct net_device *dev = head;
1724 head = head->next_sched;
1726 smp_mb__before_clear_bit();
1727 clear_bit(__LINK_STATE_SCHED, &dev->state);
1729 if (spin_trylock(&dev->queue_lock)) {
1731 spin_unlock(&dev->queue_lock);
1733 netif_schedule(dev);
1739 static __inline__ int deliver_skb(struct sk_buff *skb,
1740 struct packet_type *pt_prev,
1741 struct net_device *orig_dev)
1743 atomic_inc(&skb->users);
1744 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1747 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1748 int (*br_handle_frame_hook)(struct net_bridge_port *p, struct sk_buff **pskb);
1750 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1751 unsigned char *addr);
1752 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
1754 static __inline__ int handle_bridge(struct sk_buff **pskb,
1755 struct packet_type **pt_prev, int *ret,
1756 struct net_device *orig_dev)
1758 struct net_bridge_port *port;
1760 if ((*pskb)->pkt_type == PACKET_LOOPBACK ||
1761 (port = rcu_dereference((*pskb)->dev->br_port)) == NULL)
1765 *ret = deliver_skb(*pskb, *pt_prev, orig_dev);
1769 return br_handle_frame_hook(port, pskb);
1772 #define handle_bridge(skb, pt_prev, ret, orig_dev) (0)
1775 #ifdef CONFIG_NET_CLS_ACT
1776 /* TODO: Maybe we should just force sch_ingress to be compiled in
1777 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
1778 * a compare and 2 stores extra right now if we dont have it on
1779 * but have CONFIG_NET_CLS_ACT
1780 * NOTE: This doesnt stop any functionality; if you dont have
1781 * the ingress scheduler, you just cant add policies on ingress.
1784 static int ing_filter(struct sk_buff *skb)
1787 struct net_device *dev = skb->dev;
1788 int result = TC_ACT_OK;
1790 if (dev->qdisc_ingress) {
1791 __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
1792 if (MAX_RED_LOOP < ttl++) {
1793 printk(KERN_WARNING "Redir loop detected Dropping packet (%s->%s)\n",
1794 skb->input_dev->name, skb->dev->name);
1798 skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl);
1800 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS);
1802 spin_lock(&dev->ingress_lock);
1803 if ((q = dev->qdisc_ingress) != NULL)
1804 result = q->enqueue(skb, q);
1805 spin_unlock(&dev->ingress_lock);
1813 int netif_receive_skb(struct sk_buff *skb)
1815 struct packet_type *ptype, *pt_prev;
1816 struct net_device *orig_dev;
1817 int ret = NET_RX_DROP;
1818 unsigned short type;
1820 /* if we've gotten here through NAPI, check netpoll */
1821 if (skb->dev->poll && netpoll_rx(skb))
1824 if (!skb->tstamp.off_sec)
1827 if (!skb->input_dev)
1828 skb->input_dev = skb->dev;
1830 orig_dev = skb_bond(skb);
1835 __get_cpu_var(netdev_rx_stat).total++;
1837 skb->h.raw = skb->nh.raw = skb->data;
1838 skb->mac_len = skb->nh.raw - skb->mac.raw;
1844 #ifdef CONFIG_NET_CLS_ACT
1845 if (skb->tc_verd & TC_NCLS) {
1846 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
1852 switch (skb->ip_summed) {
1853 case CHECKSUM_UNNECESSARY:
1854 skb->proto_data_valid = 1;
1857 /* XXX Implement me. */
1859 skb->proto_data_valid = 0;
1864 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1865 if (!ptype->dev || ptype->dev == skb->dev) {
1867 ret = deliver_skb(skb, pt_prev, orig_dev);
1872 #ifdef CONFIG_NET_CLS_ACT
1874 ret = deliver_skb(skb, pt_prev, orig_dev);
1875 pt_prev = NULL; /* noone else should process this after*/
1877 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
1880 ret = ing_filter(skb);
1882 if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
1891 handle_diverter(skb);
1893 if (handle_bridge(&skb, &pt_prev, &ret, orig_dev))
1896 type = skb->protocol;
1897 list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {
1898 if (ptype->type == type &&
1899 (!ptype->dev || ptype->dev == skb->dev)) {
1901 ret = deliver_skb(skb, pt_prev, orig_dev);
1907 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1910 /* Jamal, now you will not able to escape explaining
1911 * me how you were going to use this. :-)
1921 static int process_backlog(struct net_device *backlog_dev, int *budget)
1924 int quota = min(backlog_dev->quota, *budget);
1925 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1926 unsigned long start_time = jiffies;
1928 backlog_dev->weight = weight_p;
1930 struct sk_buff *skb;
1931 struct net_device *dev;
1933 local_irq_disable();
1934 skb = __skb_dequeue(&queue->input_pkt_queue);
1941 netif_receive_skb(skb);
1947 if (work >= quota || jiffies - start_time > 1)
1952 backlog_dev->quota -= work;
1957 backlog_dev->quota -= work;
1960 list_del(&backlog_dev->poll_list);
1961 smp_mb__before_clear_bit();
1962 netif_poll_enable(backlog_dev);
1968 static void net_rx_action(struct softirq_action *h)
1970 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1971 unsigned long start_time = jiffies;
1972 int budget = netdev_budget;
1975 local_irq_disable();
1977 while (!list_empty(&queue->poll_list)) {
1978 struct net_device *dev;
1980 if (budget <= 0 || jiffies - start_time > 1)
1985 dev = list_entry(queue->poll_list.next,
1986 struct net_device, poll_list);
1987 have = netpoll_poll_lock(dev);
1989 if (dev->quota <= 0 || dev->poll(dev, &budget)) {
1990 netpoll_poll_unlock(have);
1991 local_irq_disable();
1992 list_move_tail(&dev->poll_list, &queue->poll_list);
1994 dev->quota += dev->weight;
1996 dev->quota = dev->weight;
1998 netpoll_poll_unlock(have);
2000 local_irq_disable();
2004 #ifdef CONFIG_NET_DMA
2006 * There may not be any more sk_buffs coming right now, so push
2007 * any pending DMA copies to hardware
2009 if (net_dma_client) {
2010 struct dma_chan *chan;
2012 list_for_each_entry_rcu(chan, &net_dma_client->channels, client_node)
2013 dma_async_memcpy_issue_pending(chan);
2021 __get_cpu_var(netdev_rx_stat).time_squeeze++;
2022 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
2026 static gifconf_func_t * gifconf_list [NPROTO];
2029 * register_gifconf - register a SIOCGIF handler
2030 * @family: Address family
2031 * @gifconf: Function handler
2033 * Register protocol dependent address dumping routines. The handler
2034 * that is passed must not be freed or reused until it has been replaced
2035 * by another handler.
2037 int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
2039 if (family >= NPROTO)
2041 gifconf_list[family] = gifconf;
2047 * Map an interface index to its name (SIOCGIFNAME)
2051 * We need this ioctl for efficient implementation of the
2052 * if_indextoname() function required by the IPv6 API. Without
2053 * it, we would have to search all the interfaces to find a
2057 static int dev_ifname(struct ifreq __user *arg)
2059 struct net_device *dev;
2063 * Fetch the caller's info block.
2066 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2069 read_lock(&dev_base_lock);
2070 dev = __dev_get_by_index(ifr.ifr_ifindex);
2072 read_unlock(&dev_base_lock);
2076 strcpy(ifr.ifr_name, dev->name);
2077 read_unlock(&dev_base_lock);
2079 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
2085 * Perform a SIOCGIFCONF call. This structure will change
2086 * size eventually, and there is nothing I can do about it.
2087 * Thus we will need a 'compatibility mode'.
2090 static int dev_ifconf(char __user *arg)
2093 struct net_device *dev;
2100 * Fetch the caller's info block.
2103 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
2110 * Loop over the interfaces, and write an info block for each.
2114 for (dev = dev_base; dev; dev = dev->next) {
2115 if (vx_flags(VXF_HIDE_NETIF, 0) &&
2116 !dev_in_nx_info(dev, current->nx_info))
2118 for (i = 0; i < NPROTO; i++) {
2119 if (gifconf_list[i]) {
2122 done = gifconf_list[i](dev, NULL, 0);
2124 done = gifconf_list[i](dev, pos + total,
2134 * All done. Write the updated control block back to the caller.
2136 ifc.ifc_len = total;
2139 * Both BSD and Solaris return 0 here, so we do too.
2141 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
2144 #ifdef CONFIG_PROC_FS
2146 * This is invoked by the /proc filesystem handler to display a device
2149 static __inline__ struct net_device *dev_get_idx(loff_t pos)
2151 struct net_device *dev;
2154 for (i = 0, dev = dev_base; dev && i < pos; ++i, dev = dev->next);
2156 return i == pos ? dev : NULL;
2159 void *dev_seq_start(struct seq_file *seq, loff_t *pos)
2161 read_lock(&dev_base_lock);
2162 return *pos ? dev_get_idx(*pos - 1) : SEQ_START_TOKEN;
2165 void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2168 return v == SEQ_START_TOKEN ? dev_base : ((struct net_device *)v)->next;
2171 void dev_seq_stop(struct seq_file *seq, void *v)
2173 read_unlock(&dev_base_lock);
2176 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2178 struct nx_info *nxi = current->nx_info;
2180 if (vx_flags(VXF_HIDE_NETIF, 0) && !dev_in_nx_info(dev, nxi))
2182 if (dev->get_stats) {
2183 struct net_device_stats *stats = dev->get_stats(dev);
2185 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2186 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2187 dev->name, stats->rx_bytes, stats->rx_packets,
2189 stats->rx_dropped + stats->rx_missed_errors,
2190 stats->rx_fifo_errors,
2191 stats->rx_length_errors + stats->rx_over_errors +
2192 stats->rx_crc_errors + stats->rx_frame_errors,
2193 stats->rx_compressed, stats->multicast,
2194 stats->tx_bytes, stats->tx_packets,
2195 stats->tx_errors, stats->tx_dropped,
2196 stats->tx_fifo_errors, stats->collisions,
2197 stats->tx_carrier_errors +
2198 stats->tx_aborted_errors +
2199 stats->tx_window_errors +
2200 stats->tx_heartbeat_errors,
2201 stats->tx_compressed);
2203 seq_printf(seq, "%6s: No statistics available.\n", dev->name);
2207 * Called from the PROCfs module. This now uses the new arbitrary sized
2208 * /proc/net interface to create /proc/net/dev
2210 static int dev_seq_show(struct seq_file *seq, void *v)
2212 if (v == SEQ_START_TOKEN)
2213 seq_puts(seq, "Inter-| Receive "
2215 " face |bytes packets errs drop fifo frame "
2216 "compressed multicast|bytes packets errs "
2217 "drop fifo colls carrier compressed\n");
2219 dev_seq_printf_stats(seq, v);
2223 static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2225 struct netif_rx_stats *rc = NULL;
2227 while (*pos < NR_CPUS)
2228 if (cpu_online(*pos)) {
2229 rc = &per_cpu(netdev_rx_stat, *pos);
2236 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2238 return softnet_get_online(pos);
2241 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2244 return softnet_get_online(pos);
2247 static void softnet_seq_stop(struct seq_file *seq, void *v)
2251 static int softnet_seq_show(struct seq_file *seq, void *v)
2253 struct netif_rx_stats *s = v;
2255 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2256 s->total, s->dropped, s->time_squeeze, 0,
2257 0, 0, 0, 0, /* was fastroute */
2262 static struct seq_operations dev_seq_ops = {
2263 .start = dev_seq_start,
2264 .next = dev_seq_next,
2265 .stop = dev_seq_stop,
2266 .show = dev_seq_show,
2269 static int dev_seq_open(struct inode *inode, struct file *file)
2271 return seq_open(file, &dev_seq_ops);
2274 static struct file_operations dev_seq_fops = {
2275 .owner = THIS_MODULE,
2276 .open = dev_seq_open,
2278 .llseek = seq_lseek,
2279 .release = seq_release,
2282 static struct seq_operations softnet_seq_ops = {
2283 .start = softnet_seq_start,
2284 .next = softnet_seq_next,
2285 .stop = softnet_seq_stop,
2286 .show = softnet_seq_show,
2289 static int softnet_seq_open(struct inode *inode, struct file *file)
2291 return seq_open(file, &softnet_seq_ops);
2294 static struct file_operations softnet_seq_fops = {
2295 .owner = THIS_MODULE,
2296 .open = softnet_seq_open,
2298 .llseek = seq_lseek,
2299 .release = seq_release,
2302 #ifdef CONFIG_WIRELESS_EXT
2303 extern int wireless_proc_init(void);
2305 #define wireless_proc_init() 0
2308 static int __init dev_proc_init(void)
2312 if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops))
2314 if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops))
2316 if (wireless_proc_init())
2322 proc_net_remove("softnet_stat");
2324 proc_net_remove("dev");
2328 #define dev_proc_init() 0
2329 #endif /* CONFIG_PROC_FS */
2333 * netdev_set_master - set up master/slave pair
2334 * @slave: slave device
2335 * @master: new master device
2337 * Changes the master device of the slave. Pass %NULL to break the
2338 * bonding. The caller must hold the RTNL semaphore. On a failure
2339 * a negative errno code is returned. On success the reference counts
2340 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2341 * function returns zero.
2343 int netdev_set_master(struct net_device *slave, struct net_device *master)
2345 struct net_device *old = slave->master;
2355 slave->master = master;
2363 slave->flags |= IFF_SLAVE;
2365 slave->flags &= ~IFF_SLAVE;
2367 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2372 * dev_set_promiscuity - update promiscuity count on a device
2376 * Add or remove promiscuity from a device. While the count in the device
2377 * remains above zero the interface remains promiscuous. Once it hits zero
2378 * the device reverts back to normal filtering operation. A negative inc
2379 * value is used to drop promiscuity on the device.
2381 void dev_set_promiscuity(struct net_device *dev, int inc)
2383 unsigned short old_flags = dev->flags;
2385 if ((dev->promiscuity += inc) == 0)
2386 dev->flags &= ~IFF_PROMISC;
2388 dev->flags |= IFF_PROMISC;
2389 if (dev->flags != old_flags) {
2391 printk(KERN_INFO "device %s %s promiscuous mode\n",
2392 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2394 audit_log(current->audit_context, GFP_ATOMIC,
2395 AUDIT_ANOM_PROMISCUOUS,
2396 "dev=%s prom=%d old_prom=%d auid=%u",
2397 dev->name, (dev->flags & IFF_PROMISC),
2398 (old_flags & IFF_PROMISC),
2399 audit_get_loginuid(current->audit_context));
2404 * dev_set_allmulti - update allmulti count on a device
2408 * Add or remove reception of all multicast frames to a device. While the
2409 * count in the device remains above zero the interface remains listening
2410 * to all interfaces. Once it hits zero the device reverts back to normal
2411 * filtering operation. A negative @inc value is used to drop the counter
2412 * when releasing a resource needing all multicasts.
2415 void dev_set_allmulti(struct net_device *dev, int inc)
2417 unsigned short old_flags = dev->flags;
2419 dev->flags |= IFF_ALLMULTI;
2420 if ((dev->allmulti += inc) == 0)
2421 dev->flags &= ~IFF_ALLMULTI;
2422 if (dev->flags ^ old_flags)
2426 unsigned dev_get_flags(const struct net_device *dev)
2430 flags = (dev->flags & ~(IFF_PROMISC |
2435 (dev->gflags & (IFF_PROMISC |
2438 if (netif_running(dev)) {
2439 if (netif_oper_up(dev))
2440 flags |= IFF_RUNNING;
2441 if (netif_carrier_ok(dev))
2442 flags |= IFF_LOWER_UP;
2443 if (netif_dormant(dev))
2444 flags |= IFF_DORMANT;
2450 int dev_change_flags(struct net_device *dev, unsigned flags)
2453 int old_flags = dev->flags;
2456 * Set the flags on our device.
2459 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
2460 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
2462 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
2466 * Load in the correct multicast list now the flags have changed.
2472 * Have we downed the interface. We handle IFF_UP ourselves
2473 * according to user attempts to set it, rather than blindly
2478 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
2479 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
2485 if (dev->flags & IFF_UP &&
2486 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
2488 raw_notifier_call_chain(&netdev_chain,
2489 NETDEV_CHANGE, dev);
2491 if ((flags ^ dev->gflags) & IFF_PROMISC) {
2492 int inc = (flags & IFF_PROMISC) ? +1 : -1;
2493 dev->gflags ^= IFF_PROMISC;
2494 dev_set_promiscuity(dev, inc);
2497 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
2498 is important. Some (broken) drivers set IFF_PROMISC, when
2499 IFF_ALLMULTI is requested not asking us and not reporting.
2501 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
2502 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
2503 dev->gflags ^= IFF_ALLMULTI;
2504 dev_set_allmulti(dev, inc);
2507 if (old_flags ^ dev->flags)
2508 rtmsg_ifinfo(RTM_NEWLINK, dev, old_flags ^ dev->flags);
2513 int dev_set_mtu(struct net_device *dev, int new_mtu)
2517 if (new_mtu == dev->mtu)
2520 /* MTU must be positive. */
2524 if (!netif_device_present(dev))
2528 if (dev->change_mtu)
2529 err = dev->change_mtu(dev, new_mtu);
2532 if (!err && dev->flags & IFF_UP)
2533 raw_notifier_call_chain(&netdev_chain,
2534 NETDEV_CHANGEMTU, dev);
2538 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
2542 if (!dev->set_mac_address)
2544 if (sa->sa_family != dev->type)
2546 if (!netif_device_present(dev))
2548 err = dev->set_mac_address(dev, sa);
2550 raw_notifier_call_chain(&netdev_chain,
2551 NETDEV_CHANGEADDR, dev);
2556 * Perform the SIOCxIFxxx calls.
2558 static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
2561 struct net_device *dev = __dev_get_by_name(ifr->ifr_name);
2567 case SIOCGIFFLAGS: /* Get interface flags */
2568 ifr->ifr_flags = dev_get_flags(dev);
2571 case SIOCSIFFLAGS: /* Set interface flags */
2572 return dev_change_flags(dev, ifr->ifr_flags);
2574 case SIOCGIFMETRIC: /* Get the metric on the interface
2575 (currently unused) */
2576 ifr->ifr_metric = 0;
2579 case SIOCSIFMETRIC: /* Set the metric on the interface
2580 (currently unused) */
2583 case SIOCGIFMTU: /* Get the MTU of a device */
2584 ifr->ifr_mtu = dev->mtu;
2587 case SIOCSIFMTU: /* Set the MTU of a device */
2588 return dev_set_mtu(dev, ifr->ifr_mtu);
2592 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
2594 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
2595 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2596 ifr->ifr_hwaddr.sa_family = dev->type;
2600 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
2602 case SIOCSIFHWBROADCAST:
2603 if (ifr->ifr_hwaddr.sa_family != dev->type)
2605 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
2606 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2607 raw_notifier_call_chain(&netdev_chain,
2608 NETDEV_CHANGEADDR, dev);
2612 ifr->ifr_map.mem_start = dev->mem_start;
2613 ifr->ifr_map.mem_end = dev->mem_end;
2614 ifr->ifr_map.base_addr = dev->base_addr;
2615 ifr->ifr_map.irq = dev->irq;
2616 ifr->ifr_map.dma = dev->dma;
2617 ifr->ifr_map.port = dev->if_port;
2621 if (dev->set_config) {
2622 if (!netif_device_present(dev))
2624 return dev->set_config(dev, &ifr->ifr_map);
2629 if (!dev->set_multicast_list ||
2630 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2632 if (!netif_device_present(dev))
2634 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
2638 if (!dev->set_multicast_list ||
2639 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2641 if (!netif_device_present(dev))
2643 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
2647 ifr->ifr_ifindex = dev->ifindex;
2651 ifr->ifr_qlen = dev->tx_queue_len;
2655 if (ifr->ifr_qlen < 0)
2657 dev->tx_queue_len = ifr->ifr_qlen;
2661 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
2662 return dev_change_name(dev, ifr->ifr_newname);
2665 * Unknown or private ioctl
2669 if ((cmd >= SIOCDEVPRIVATE &&
2670 cmd <= SIOCDEVPRIVATE + 15) ||
2671 cmd == SIOCBONDENSLAVE ||
2672 cmd == SIOCBONDRELEASE ||
2673 cmd == SIOCBONDSETHWADDR ||
2674 cmd == SIOCBONDSLAVEINFOQUERY ||
2675 cmd == SIOCBONDINFOQUERY ||
2676 cmd == SIOCBONDCHANGEACTIVE ||
2677 cmd == SIOCGMIIPHY ||
2678 cmd == SIOCGMIIREG ||
2679 cmd == SIOCSMIIREG ||
2680 cmd == SIOCBRADDIF ||
2681 cmd == SIOCBRDELIF ||
2682 cmd == SIOCWANDEV) {
2684 if (dev->do_ioctl) {
2685 if (netif_device_present(dev))
2686 err = dev->do_ioctl(dev, ifr,
2699 * This function handles all "interface"-type I/O control requests. The actual
2700 * 'doing' part of this is dev_ifsioc above.
2704 * dev_ioctl - network device ioctl
2705 * @cmd: command to issue
2706 * @arg: pointer to a struct ifreq in user space
2708 * Issue ioctl functions to devices. This is normally called by the
2709 * user space syscall interfaces but can sometimes be useful for
2710 * other purposes. The return value is the return from the syscall if
2711 * positive or a negative errno code on error.
2714 int dev_ioctl(unsigned int cmd, void __user *arg)
2720 /* One special case: SIOCGIFCONF takes ifconf argument
2721 and requires shared lock, because it sleeps writing
2725 if (cmd == SIOCGIFCONF) {
2727 ret = dev_ifconf((char __user *) arg);
2731 if (cmd == SIOCGIFNAME)
2732 return dev_ifname((struct ifreq __user *)arg);
2734 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2737 ifr.ifr_name[IFNAMSIZ-1] = 0;
2739 colon = strchr(ifr.ifr_name, ':');
2744 * See which interface the caller is talking about.
2749 * These ioctl calls:
2750 * - can be done by all.
2751 * - atomic and do not require locking.
2762 dev_load(ifr.ifr_name);
2763 read_lock(&dev_base_lock);
2764 ret = dev_ifsioc(&ifr, cmd);
2765 read_unlock(&dev_base_lock);
2769 if (copy_to_user(arg, &ifr,
2770 sizeof(struct ifreq)))
2776 dev_load(ifr.ifr_name);
2778 ret = dev_ethtool(&ifr);
2783 if (copy_to_user(arg, &ifr,
2784 sizeof(struct ifreq)))
2790 * These ioctl calls:
2791 * - require superuser power.
2792 * - require strict serialization.
2798 if (!capable(CAP_NET_ADMIN))
2800 dev_load(ifr.ifr_name);
2802 ret = dev_ifsioc(&ifr, cmd);
2807 if (copy_to_user(arg, &ifr,
2808 sizeof(struct ifreq)))
2814 * These ioctl calls:
2815 * - require superuser power.
2816 * - require strict serialization.
2817 * - do not return a value
2827 case SIOCSIFHWBROADCAST:
2830 case SIOCBONDENSLAVE:
2831 case SIOCBONDRELEASE:
2832 case SIOCBONDSETHWADDR:
2833 case SIOCBONDCHANGEACTIVE:
2836 if (!capable(CAP_NET_ADMIN))
2839 case SIOCBONDSLAVEINFOQUERY:
2840 case SIOCBONDINFOQUERY:
2841 dev_load(ifr.ifr_name);
2843 ret = dev_ifsioc(&ifr, cmd);
2848 /* Get the per device memory space. We can add this but
2849 * currently do not support it */
2851 /* Set the per device memory buffer space.
2852 * Not applicable in our case */
2857 * Unknown or private ioctl.
2860 if (cmd == SIOCWANDEV ||
2861 (cmd >= SIOCDEVPRIVATE &&
2862 cmd <= SIOCDEVPRIVATE + 15)) {
2863 dev_load(ifr.ifr_name);
2865 ret = dev_ifsioc(&ifr, cmd);
2867 if (!ret && copy_to_user(arg, &ifr,
2868 sizeof(struct ifreq)))
2872 #ifdef CONFIG_WIRELESS_EXT
2873 /* Take care of Wireless Extensions */
2874 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
2875 /* If command is `set a parameter', or
2876 * `get the encoding parameters', check if
2877 * the user has the right to do it */
2878 if (IW_IS_SET(cmd) || cmd == SIOCGIWENCODE
2879 || cmd == SIOCGIWENCODEEXT) {
2880 if (!capable(CAP_NET_ADMIN))
2883 dev_load(ifr.ifr_name);
2885 /* Follow me in net/core/wireless.c */
2886 ret = wireless_process_ioctl(&ifr, cmd);
2888 if (IW_IS_GET(cmd) &&
2889 copy_to_user(arg, &ifr,
2890 sizeof(struct ifreq)))
2894 #endif /* CONFIG_WIRELESS_EXT */
2901 * dev_new_index - allocate an ifindex
2903 * Returns a suitable unique value for a new device interface
2904 * number. The caller must hold the rtnl semaphore or the
2905 * dev_base_lock to be sure it remains unique.
2907 static int dev_new_index(void)
2913 if (!__dev_get_by_index(ifindex))
2918 static int dev_boot_phase = 1;
2920 /* Delayed registration/unregisteration */
2921 static DEFINE_SPINLOCK(net_todo_list_lock);
2922 static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list);
2924 static inline void net_set_todo(struct net_device *dev)
2926 spin_lock(&net_todo_list_lock);
2927 list_add_tail(&dev->todo_list, &net_todo_list);
2928 spin_unlock(&net_todo_list_lock);
2932 * register_netdevice - register a network device
2933 * @dev: device to register
2935 * Take a completed network device structure and add it to the kernel
2936 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
2937 * chain. 0 is returned on success. A negative errno code is returned
2938 * on a failure to set up the device, or if the name is a duplicate.
2940 * Callers must hold the rtnl semaphore. You may want
2941 * register_netdev() instead of this.
2944 * The locking appears insufficient to guarantee two parallel registers
2945 * will not get the same name.
2948 int register_netdevice(struct net_device *dev)
2950 struct hlist_head *head;
2951 struct hlist_node *p;
2954 BUG_ON(dev_boot_phase);
2959 /* When net_device's are persistent, this will be fatal. */
2960 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
2962 spin_lock_init(&dev->queue_lock);
2963 spin_lock_init(&dev->_xmit_lock);
2964 dev->xmit_lock_owner = -1;
2965 #ifdef CONFIG_NET_CLS_ACT
2966 spin_lock_init(&dev->ingress_lock);
2969 ret = alloc_divert_blk(dev);
2975 /* Init, if this function is available */
2977 ret = dev->init(dev);
2985 if (!dev_valid_name(dev->name)) {
2990 dev->ifindex = dev_new_index();
2991 if (dev->iflink == -1)
2992 dev->iflink = dev->ifindex;
2994 /* Check for existence of name */
2995 head = dev_name_hash(dev->name);
2996 hlist_for_each(p, head) {
2997 struct net_device *d
2998 = hlist_entry(p, struct net_device, name_hlist);
2999 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
3005 /* Fix illegal SG+CSUM combinations. */
3006 if ((dev->features & NETIF_F_SG) &&
3007 !(dev->features & NETIF_F_ALL_CSUM)) {
3008 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
3010 dev->features &= ~NETIF_F_SG;
3013 /* TSO requires that SG is present as well. */
3014 if ((dev->features & NETIF_F_TSO) &&
3015 !(dev->features & NETIF_F_SG)) {
3016 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
3018 dev->features &= ~NETIF_F_TSO;
3020 if (dev->features & NETIF_F_UFO) {
3021 if (!(dev->features & NETIF_F_HW_CSUM)) {
3022 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3023 "NETIF_F_HW_CSUM feature.\n",
3025 dev->features &= ~NETIF_F_UFO;
3027 if (!(dev->features & NETIF_F_SG)) {
3028 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3029 "NETIF_F_SG feature.\n",
3031 dev->features &= ~NETIF_F_UFO;
3036 * nil rebuild_header routine,
3037 * that should be never called and used as just bug trap.
3040 if (!dev->rebuild_header)
3041 dev->rebuild_header = default_rebuild_header;
3043 ret = netdev_register_sysfs(dev);
3046 dev->reg_state = NETREG_REGISTERED;
3049 * Default initial state at registry is that the
3050 * device is present.
3053 set_bit(__LINK_STATE_PRESENT, &dev->state);
3056 dev_init_scheduler(dev);
3057 write_lock_bh(&dev_base_lock);
3059 dev_tail = &dev->next;
3060 hlist_add_head(&dev->name_hlist, head);
3061 hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex));
3063 write_unlock_bh(&dev_base_lock);
3065 /* Notify protocols, that a new device appeared. */
3066 raw_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
3073 free_divert_blk(dev);
3078 * register_netdev - register a network device
3079 * @dev: device to register
3081 * Take a completed network device structure and add it to the kernel
3082 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3083 * chain. 0 is returned on success. A negative errno code is returned
3084 * on a failure to set up the device, or if the name is a duplicate.
3086 * This is a wrapper around register_netdev that takes the rtnl semaphore
3087 * and expands the device name if you passed a format string to
3090 int register_netdev(struct net_device *dev)
3097 * If the name is a format string the caller wants us to do a
3100 if (strchr(dev->name, '%')) {
3101 err = dev_alloc_name(dev, dev->name);
3107 * Back compatibility hook. Kill this one in 2.5
3109 if (dev->name[0] == 0 || dev->name[0] == ' ') {
3110 err = dev_alloc_name(dev, "eth%d");
3115 err = register_netdevice(dev);
3120 EXPORT_SYMBOL(register_netdev);
3123 * netdev_wait_allrefs - wait until all references are gone.
3125 * This is called when unregistering network devices.
3127 * Any protocol or device that holds a reference should register
3128 * for netdevice notification, and cleanup and put back the
3129 * reference if they receive an UNREGISTER event.
3130 * We can get stuck here if buggy protocols don't correctly
3133 static void netdev_wait_allrefs(struct net_device *dev)
3135 unsigned long rebroadcast_time, warning_time;
3137 rebroadcast_time = warning_time = jiffies;
3138 while (atomic_read(&dev->refcnt) != 0) {
3139 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
3142 /* Rebroadcast unregister notification */
3143 raw_notifier_call_chain(&netdev_chain,
3144 NETDEV_UNREGISTER, dev);
3146 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
3148 /* We must not have linkwatch events
3149 * pending on unregister. If this
3150 * happens, we simply run the queue
3151 * unscheduled, resulting in a noop
3154 linkwatch_run_queue();
3159 rebroadcast_time = jiffies;
3164 if (time_after(jiffies, warning_time + 10 * HZ)) {
3165 printk(KERN_EMERG "unregister_netdevice: "
3166 "waiting for %s to become free. Usage "
3168 dev->name, atomic_read(&dev->refcnt));
3169 warning_time = jiffies;
3178 * register_netdevice(x1);
3179 * register_netdevice(x2);
3181 * unregister_netdevice(y1);
3182 * unregister_netdevice(y2);
3188 * We are invoked by rtnl_unlock() after it drops the semaphore.
3189 * This allows us to deal with problems:
3190 * 1) We can delete sysfs objects which invoke hotplug
3191 * without deadlocking with linkwatch via keventd.
3192 * 2) Since we run with the RTNL semaphore not held, we can sleep
3193 * safely in order to wait for the netdev refcnt to drop to zero.
3195 static DEFINE_MUTEX(net_todo_run_mutex);
3196 void netdev_run_todo(void)
3198 struct list_head list;
3200 /* Need to guard against multiple cpu's getting out of order. */
3201 mutex_lock(&net_todo_run_mutex);
3203 /* Not safe to do outside the semaphore. We must not return
3204 * until all unregister events invoked by the local processor
3205 * have been completed (either by this todo run, or one on
3208 if (list_empty(&net_todo_list))
3211 /* Snapshot list, allow later requests */
3212 spin_lock(&net_todo_list_lock);
3213 list_replace_init(&net_todo_list, &list);
3214 spin_unlock(&net_todo_list_lock);
3216 while (!list_empty(&list)) {
3217 struct net_device *dev
3218 = list_entry(list.next, struct net_device, todo_list);
3219 list_del(&dev->todo_list);
3221 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
3222 printk(KERN_ERR "network todo '%s' but state %d\n",
3223 dev->name, dev->reg_state);
3228 netdev_unregister_sysfs(dev);
3229 dev->reg_state = NETREG_UNREGISTERED;
3231 netdev_wait_allrefs(dev);
3234 BUG_ON(atomic_read(&dev->refcnt));
3235 BUG_TRAP(!dev->ip_ptr);
3236 BUG_TRAP(!dev->ip6_ptr);
3237 BUG_TRAP(!dev->dn_ptr);
3239 /* It must be the very last action,
3240 * after this 'dev' may point to freed up memory.
3242 if (dev->destructor)
3243 dev->destructor(dev);
3247 mutex_unlock(&net_todo_run_mutex);
3251 * alloc_netdev - allocate network device
3252 * @sizeof_priv: size of private data to allocate space for
3253 * @name: device name format string
3254 * @setup: callback to initialize device
3256 * Allocates a struct net_device with private data area for driver use
3257 * and performs basic initialization.
3259 struct net_device *alloc_netdev(int sizeof_priv, const char *name,
3260 void (*setup)(struct net_device *))
3263 struct net_device *dev;
3266 /* ensure 32-byte alignment of both the device and private area */
3267 alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
3268 alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
3270 p = kzalloc(alloc_size, GFP_KERNEL);
3272 printk(KERN_ERR "alloc_dev: Unable to allocate device.\n");
3276 dev = (struct net_device *)
3277 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
3278 dev->padded = (char *)dev - (char *)p;
3281 dev->priv = netdev_priv(dev);
3284 strcpy(dev->name, name);
3287 EXPORT_SYMBOL(alloc_netdev);
3290 * free_netdev - free network device
3293 * This function does the last stage of destroying an allocated device
3294 * interface. The reference to the device object is released.
3295 * If this is the last reference then it will be freed.
3297 void free_netdev(struct net_device *dev)
3300 /* Compatibility with error handling in drivers */
3301 if (dev->reg_state == NETREG_UNINITIALIZED) {
3302 kfree((char *)dev - dev->padded);
3306 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
3307 dev->reg_state = NETREG_RELEASED;
3309 /* will free via class release */
3310 class_device_put(&dev->class_dev);
3312 kfree((char *)dev - dev->padded);
3316 /* Synchronize with packet receive processing. */
3317 void synchronize_net(void)
3324 * unregister_netdevice - remove device from the kernel
3327 * This function shuts down a device interface and removes it
3328 * from the kernel tables. On success 0 is returned, on a failure
3329 * a negative errno code is returned.
3331 * Callers must hold the rtnl semaphore. You may want
3332 * unregister_netdev() instead of this.
3335 int unregister_netdevice(struct net_device *dev)
3337 struct net_device *d, **dp;
3339 BUG_ON(dev_boot_phase);
3342 /* Some devices call without registering for initialization unwind. */
3343 if (dev->reg_state == NETREG_UNINITIALIZED) {
3344 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3345 "was registered\n", dev->name, dev);
3349 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3351 /* If device is running, close it first. */
3352 if (dev->flags & IFF_UP)
3355 /* And unlink it from device chain. */
3356 for (dp = &dev_base; (d = *dp) != NULL; dp = &d->next) {
3358 write_lock_bh(&dev_base_lock);
3359 hlist_del(&dev->name_hlist);
3360 hlist_del(&dev->index_hlist);
3361 if (dev_tail == &dev->next)
3364 write_unlock_bh(&dev_base_lock);
3369 printk(KERN_ERR "unregister net_device: '%s' not found\n",
3374 dev->reg_state = NETREG_UNREGISTERING;
3378 /* Shutdown queueing discipline. */
3382 /* Notify protocols, that we are about to destroy
3383 this device. They should clean all the things.
3385 raw_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
3388 * Flush the multicast chain
3390 dev_mc_discard(dev);
3395 /* Notifier chain MUST detach us from master device. */
3396 BUG_TRAP(!dev->master);
3398 free_divert_blk(dev);
3400 /* Finish processing unregister after unlock */
3410 * unregister_netdev - remove device from the kernel
3413 * This function shuts down a device interface and removes it
3414 * from the kernel tables. On success 0 is returned, on a failure
3415 * a negative errno code is returned.
3417 * This is just a wrapper for unregister_netdevice that takes
3418 * the rtnl semaphore. In general you want to use this and not
3419 * unregister_netdevice.
3421 void unregister_netdev(struct net_device *dev)
3424 unregister_netdevice(dev);
3428 EXPORT_SYMBOL(unregister_netdev);
3430 #ifdef CONFIG_HOTPLUG_CPU
3431 static int dev_cpu_callback(struct notifier_block *nfb,
3432 unsigned long action,
3435 struct sk_buff **list_skb;
3436 struct net_device **list_net;
3437 struct sk_buff *skb;
3438 unsigned int cpu, oldcpu = (unsigned long)ocpu;
3439 struct softnet_data *sd, *oldsd;
3441 if (action != CPU_DEAD)
3444 local_irq_disable();
3445 cpu = smp_processor_id();
3446 sd = &per_cpu(softnet_data, cpu);
3447 oldsd = &per_cpu(softnet_data, oldcpu);
3449 /* Find end of our completion_queue. */
3450 list_skb = &sd->completion_queue;
3452 list_skb = &(*list_skb)->next;
3453 /* Append completion queue from offline CPU. */
3454 *list_skb = oldsd->completion_queue;
3455 oldsd->completion_queue = NULL;
3457 /* Find end of our output_queue. */
3458 list_net = &sd->output_queue;
3460 list_net = &(*list_net)->next_sched;
3461 /* Append output queue from offline CPU. */
3462 *list_net = oldsd->output_queue;
3463 oldsd->output_queue = NULL;
3465 raise_softirq_irqoff(NET_TX_SOFTIRQ);
3468 /* Process offline CPU's input_pkt_queue */
3469 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
3474 #endif /* CONFIG_HOTPLUG_CPU */
3476 #ifdef CONFIG_NET_DMA
3478 * net_dma_rebalance -
3479 * This is called when the number of channels allocated to the net_dma_client
3480 * changes. The net_dma_client tries to have one DMA channel per CPU.
3482 static void net_dma_rebalance(void)
3484 unsigned int cpu, i, n;
3485 struct dma_chan *chan;
3487 if (net_dma_count == 0) {
3488 for_each_online_cpu(cpu)
3489 rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
3494 cpu = first_cpu(cpu_online_map);
3497 list_for_each_entry(chan, &net_dma_client->channels, client_node) {
3498 n = ((num_online_cpus() / net_dma_count)
3499 + (i < (num_online_cpus() % net_dma_count) ? 1 : 0));
3502 per_cpu(softnet_data, cpu).net_dma = chan;
3503 cpu = next_cpu(cpu, cpu_online_map);
3512 * netdev_dma_event - event callback for the net_dma_client
3513 * @client: should always be net_dma_client
3514 * @chan: DMA channel for the event
3515 * @event: event type
3517 static void netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
3518 enum dma_event event)
3520 spin_lock(&net_dma_event_lock);
3522 case DMA_RESOURCE_ADDED:
3524 net_dma_rebalance();
3526 case DMA_RESOURCE_REMOVED:
3528 net_dma_rebalance();
3533 spin_unlock(&net_dma_event_lock);
3537 * netdev_dma_regiser - register the networking subsystem as a DMA client
3539 static int __init netdev_dma_register(void)
3541 spin_lock_init(&net_dma_event_lock);
3542 net_dma_client = dma_async_client_register(netdev_dma_event);
3543 if (net_dma_client == NULL)
3546 dma_async_client_chan_request(net_dma_client, num_online_cpus());
3551 static int __init netdev_dma_register(void) { return -ENODEV; }
3552 #endif /* CONFIG_NET_DMA */
3555 * Initialize the DEV module. At boot time this walks the device list and
3556 * unhooks any devices that fail to initialise (normally hardware not
3557 * present) and leaves us with a valid list of present and active devices.
3562 * This is called single threaded during boot, so no need
3563 * to take the rtnl semaphore.
3565 static int __init net_dev_init(void)
3567 int i, rc = -ENOMEM;
3569 BUG_ON(!dev_boot_phase);
3573 if (dev_proc_init())
3576 if (netdev_sysfs_init())
3579 INIT_LIST_HEAD(&ptype_all);
3580 for (i = 0; i < 16; i++)
3581 INIT_LIST_HEAD(&ptype_base[i]);
3583 for (i = 0; i < ARRAY_SIZE(dev_name_head); i++)
3584 INIT_HLIST_HEAD(&dev_name_head[i]);
3586 for (i = 0; i < ARRAY_SIZE(dev_index_head); i++)
3587 INIT_HLIST_HEAD(&dev_index_head[i]);
3590 * Initialise the packet receive queues.
3593 for_each_possible_cpu(i) {
3594 struct softnet_data *queue;
3596 queue = &per_cpu(softnet_data, i);
3597 skb_queue_head_init(&queue->input_pkt_queue);
3598 queue->completion_queue = NULL;
3599 INIT_LIST_HEAD(&queue->poll_list);
3600 set_bit(__LINK_STATE_START, &queue->backlog_dev.state);
3601 queue->backlog_dev.weight = weight_p;
3602 queue->backlog_dev.poll = process_backlog;
3603 atomic_set(&queue->backlog_dev.refcnt, 1);
3606 netdev_dma_register();
3610 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
3611 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
3613 hotcpu_notifier(dev_cpu_callback, 0);
3621 subsys_initcall(net_dev_init);
3623 EXPORT_SYMBOL(__dev_get_by_index);
3624 EXPORT_SYMBOL(__dev_get_by_name);
3625 EXPORT_SYMBOL(__dev_remove_pack);
3626 EXPORT_SYMBOL(dev_valid_name);
3627 EXPORT_SYMBOL(dev_add_pack);
3628 EXPORT_SYMBOL(dev_alloc_name);
3629 EXPORT_SYMBOL(dev_close);
3630 EXPORT_SYMBOL(dev_get_by_flags);
3631 EXPORT_SYMBOL(dev_get_by_index);
3632 EXPORT_SYMBOL(dev_get_by_name);
3633 EXPORT_SYMBOL(dev_open);
3634 EXPORT_SYMBOL(dev_queue_xmit);
3635 EXPORT_SYMBOL(dev_remove_pack);
3636 EXPORT_SYMBOL(dev_set_allmulti);
3637 EXPORT_SYMBOL(dev_set_promiscuity);
3638 EXPORT_SYMBOL(dev_change_flags);
3639 EXPORT_SYMBOL(dev_set_mtu);
3640 EXPORT_SYMBOL(dev_set_mac_address);
3641 EXPORT_SYMBOL(free_netdev);
3642 EXPORT_SYMBOL(netdev_boot_setup_check);
3643 EXPORT_SYMBOL(netdev_set_master);
3644 EXPORT_SYMBOL(netdev_state_change);
3645 EXPORT_SYMBOL(netif_receive_skb);
3646 EXPORT_SYMBOL(netif_rx);
3647 EXPORT_SYMBOL(register_gifconf);
3648 EXPORT_SYMBOL(register_netdevice);
3649 EXPORT_SYMBOL(register_netdevice_notifier);
3650 EXPORT_SYMBOL(skb_checksum_help);
3651 EXPORT_SYMBOL(synchronize_net);
3652 EXPORT_SYMBOL(unregister_netdevice);
3653 EXPORT_SYMBOL(unregister_netdevice_notifier);
3654 EXPORT_SYMBOL(net_enable_timestamp);
3655 EXPORT_SYMBOL(net_disable_timestamp);
3656 EXPORT_SYMBOL(dev_get_flags);
3657 EXPORT_SYMBOL(skb_checksum_setup);
3659 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
3660 EXPORT_SYMBOL(br_handle_frame_hook);
3661 EXPORT_SYMBOL(br_fdb_get_hook);
3662 EXPORT_SYMBOL(br_fdb_put_hook);
3666 EXPORT_SYMBOL(dev_load);
3669 EXPORT_PER_CPU_SYMBOL(softnet_data);