2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/cpu.h>
80 #include <linux/types.h>
81 #include <linux/kernel.h>
82 #include <linux/sched.h>
83 #include <linux/mutex.h>
84 #include <linux/string.h>
86 #include <linux/socket.h>
87 #include <linux/sockios.h>
88 #include <linux/errno.h>
89 #include <linux/interrupt.h>
90 #include <linux/if_ether.h>
91 #include <linux/netdevice.h>
92 #include <linux/etherdevice.h>
93 #include <linux/notifier.h>
94 #include <linux/skbuff.h>
96 #include <linux/rtnetlink.h>
97 #include <linux/proc_fs.h>
98 #include <linux/seq_file.h>
99 #include <linux/stat.h>
100 #include <linux/if_bridge.h>
102 #include <net/pkt_sched.h>
103 #include <net/checksum.h>
104 #include <linux/highmem.h>
105 #include <linux/init.h>
106 #include <linux/kmod.h>
107 #include <linux/module.h>
108 #include <linux/kallsyms.h>
109 #include <linux/netpoll.h>
110 #include <linux/rcupdate.h>
111 #include <linux/delay.h>
112 #include <linux/wireless.h>
113 #include <net/iw_handler.h>
114 #include <asm/current.h>
115 #include <linux/audit.h>
116 #include <linux/dmaengine.h>
117 #include <linux/err.h>
118 #include <linux/ctype.h>
119 #include <linux/vs_context.h> /* remove with NXF_HIDE_NETIF */
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 (strlen(name) >= IFNAMSIZ)
652 if (!strcmp(name, ".") || !strcmp(name, ".."))
656 if (*name == '/' || isspace(*name))
664 * dev_alloc_name - allocate a name for a device
666 * @name: name format string
668 * Passed a format string - eg "lt%d" it will try and find a suitable
669 * id. It scans list of devices to build up a free map, then chooses
670 * the first empty slot. The caller must hold the dev_base or rtnl lock
671 * while allocating the name and adding the device in order to avoid
673 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
674 * Returns the number of the unit assigned or a negative errno code.
677 int dev_alloc_name(struct net_device *dev, const char *name)
682 const int max_netdevices = 8*PAGE_SIZE;
684 struct net_device *d;
686 p = strnchr(name, IFNAMSIZ-1, '%');
689 * Verify the string as this thing may have come from
690 * the user. There must be either one "%d" and no other "%"
693 if (p[1] != 'd' || strchr(p + 2, '%'))
696 /* Use one page as a bit array of possible slots */
697 inuse = (long *) get_zeroed_page(GFP_ATOMIC);
701 for (d = dev_base; d; d = d->next) {
702 if (!sscanf(d->name, name, &i))
704 if (i < 0 || i >= max_netdevices)
707 /* avoid cases where sscanf is not exact inverse of printf */
708 snprintf(buf, sizeof(buf), name, i);
709 if (!strncmp(buf, d->name, IFNAMSIZ))
713 i = find_first_zero_bit(inuse, max_netdevices);
714 free_page((unsigned long) inuse);
717 snprintf(buf, sizeof(buf), name, i);
718 if (!__dev_get_by_name(buf)) {
719 strlcpy(dev->name, buf, IFNAMSIZ);
723 /* It is possible to run out of possible slots
724 * when the name is long and there isn't enough space left
725 * for the digits, or if all bits are used.
732 * dev_change_name - change name of a device
734 * @newname: name (or format string) must be at least IFNAMSIZ
736 * Change name of a device, can pass format strings "eth%d".
739 int dev_change_name(struct net_device *dev, char *newname)
745 if (dev->flags & IFF_UP)
748 if (!dev_valid_name(newname))
751 if (strchr(newname, '%')) {
752 err = dev_alloc_name(dev, newname);
755 strcpy(newname, dev->name);
757 else if (__dev_get_by_name(newname))
760 strlcpy(dev->name, newname, IFNAMSIZ);
762 err = class_device_rename(&dev->class_dev, dev->name);
764 hlist_del(&dev->name_hlist);
765 hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name));
766 raw_notifier_call_chain(&netdev_chain,
767 NETDEV_CHANGENAME, dev);
774 * netdev_features_change - device changes features
775 * @dev: device to cause notification
777 * Called to indicate a device has changed features.
779 void netdev_features_change(struct net_device *dev)
781 raw_notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
783 EXPORT_SYMBOL(netdev_features_change);
786 * netdev_state_change - device changes state
787 * @dev: device to cause notification
789 * Called to indicate a device has changed state. This function calls
790 * the notifier chains for netdev_chain and sends a NEWLINK message
791 * to the routing socket.
793 void netdev_state_change(struct net_device *dev)
795 if (dev->flags & IFF_UP) {
796 raw_notifier_call_chain(&netdev_chain,
798 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
803 * dev_load - load a network module
804 * @name: name of interface
806 * If a network interface is not present and the process has suitable
807 * privileges this function loads the module. If module loading is not
808 * available in this kernel then it becomes a nop.
811 void dev_load(const char *name)
813 struct net_device *dev;
815 read_lock(&dev_base_lock);
816 dev = __dev_get_by_name(name);
817 read_unlock(&dev_base_lock);
819 if (!dev && capable(CAP_SYS_MODULE))
820 request_module("%s", name);
823 static int default_rebuild_header(struct sk_buff *skb)
825 printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
826 skb->dev ? skb->dev->name : "NULL!!!");
833 * dev_open - prepare an interface for use.
834 * @dev: device to open
836 * Takes a device from down to up state. The device's private open
837 * function is invoked and then the multicast lists are loaded. Finally
838 * the device is moved into the up state and a %NETDEV_UP message is
839 * sent to the netdev notifier chain.
841 * Calling this function on an active interface is a nop. On a failure
842 * a negative errno code is returned.
844 int dev_open(struct net_device *dev)
852 if (dev->flags & IFF_UP)
856 * Is it even present?
858 if (!netif_device_present(dev))
862 * Call device private open method
864 set_bit(__LINK_STATE_START, &dev->state);
866 ret = dev->open(dev);
868 clear_bit(__LINK_STATE_START, &dev->state);
872 * If it went open OK then:
879 dev->flags |= IFF_UP;
882 * Initialize multicasting status
887 * Wakeup transmit queue engine
892 * ... and announce new interface.
894 raw_notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
900 * dev_close - shutdown an interface.
901 * @dev: device to shutdown
903 * This function moves an active device into down state. A
904 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
905 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
908 int dev_close(struct net_device *dev)
910 if (!(dev->flags & IFF_UP))
914 * Tell people we are going down, so that they can
915 * prepare to death, when device is still operating.
917 raw_notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
921 clear_bit(__LINK_STATE_START, &dev->state);
923 /* Synchronize to scheduled poll. We cannot touch poll list,
924 * it can be even on different cpu. So just clear netif_running(),
925 * and wait when poll really will happen. Actually, the best place
926 * for this is inside dev->stop() after device stopped its irq
927 * engine, but this requires more changes in devices. */
929 smp_mb__after_clear_bit(); /* Commit netif_running(). */
930 while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
936 * Call the device specific close. This cannot fail.
937 * Only if device is UP
939 * We allow it to be called even after a DETACH hot-plug
946 * Device is now down.
949 dev->flags &= ~IFF_UP;
952 * Tell people we are down
954 raw_notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
961 * Device change register/unregister. These are not inline or static
962 * as we export them to the world.
966 * register_netdevice_notifier - register a network notifier block
969 * Register a notifier to be called when network device events occur.
970 * The notifier passed is linked into the kernel structures and must
971 * not be reused until it has been unregistered. A negative errno code
972 * is returned on a failure.
974 * When registered all registration and up events are replayed
975 * to the new notifier to allow device to have a race free
976 * view of the network device list.
979 int register_netdevice_notifier(struct notifier_block *nb)
981 struct net_device *dev;
985 err = raw_notifier_chain_register(&netdev_chain, nb);
987 for (dev = dev_base; dev; dev = dev->next) {
988 nb->notifier_call(nb, NETDEV_REGISTER, dev);
990 if (dev->flags & IFF_UP)
991 nb->notifier_call(nb, NETDEV_UP, dev);
999 * unregister_netdevice_notifier - unregister a network notifier block
1002 * Unregister a notifier previously registered by
1003 * register_netdevice_notifier(). The notifier is unlinked into the
1004 * kernel structures and may then be reused. A negative errno code
1005 * is returned on a failure.
1008 int unregister_netdevice_notifier(struct notifier_block *nb)
1013 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1019 * call_netdevice_notifiers - call all network notifier blocks
1020 * @val: value passed unmodified to notifier function
1021 * @v: pointer passed unmodified to notifier function
1023 * Call all network notifier blocks. Parameters and return value
1024 * are as for raw_notifier_call_chain().
1027 int call_netdevice_notifiers(unsigned long val, void *v)
1029 return raw_notifier_call_chain(&netdev_chain, val, v);
1032 /* When > 0 there are consumers of rx skb time stamps */
1033 static atomic_t netstamp_needed = ATOMIC_INIT(0);
1035 void net_enable_timestamp(void)
1037 atomic_inc(&netstamp_needed);
1040 void net_disable_timestamp(void)
1042 atomic_dec(&netstamp_needed);
1045 void __net_timestamp(struct sk_buff *skb)
1049 do_gettimeofday(&tv);
1050 skb_set_timestamp(skb, &tv);
1052 EXPORT_SYMBOL(__net_timestamp);
1054 static inline void net_timestamp(struct sk_buff *skb)
1056 if (atomic_read(&netstamp_needed))
1057 __net_timestamp(skb);
1059 skb->tstamp.off_sec = 0;
1060 skb->tstamp.off_usec = 0;
1065 * Support routine. Sends outgoing frames to any network
1066 * taps currently in use.
1069 static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1071 struct packet_type *ptype;
1076 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1077 /* Never send packets back to the socket
1078 * they originated from - MvS (miquels@drinkel.ow.org)
1080 if ((ptype->dev == dev || !ptype->dev) &&
1081 (ptype->af_packet_priv == NULL ||
1082 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1083 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1087 /* skb->nh should be correctly
1088 set by sender, so that the second statement is
1089 just protection against buggy protocols.
1091 skb2->mac.raw = skb2->data;
1093 if (skb2->nh.raw < skb2->data ||
1094 skb2->nh.raw > skb2->tail) {
1095 if (net_ratelimit())
1096 printk(KERN_CRIT "protocol %04x is "
1098 skb2->protocol, dev->name);
1099 skb2->nh.raw = skb2->data;
1102 skb2->h.raw = skb2->nh.raw;
1103 skb2->pkt_type = PACKET_OUTGOING;
1104 ptype->func(skb2, skb->dev, ptype, skb->dev);
1111 void __netif_schedule(struct net_device *dev)
1113 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
1114 unsigned long flags;
1115 struct softnet_data *sd;
1117 local_irq_save(flags);
1118 sd = &__get_cpu_var(softnet_data);
1119 dev->next_sched = sd->output_queue;
1120 sd->output_queue = dev;
1121 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1122 local_irq_restore(flags);
1125 EXPORT_SYMBOL(__netif_schedule);
1127 void __netif_rx_schedule(struct net_device *dev)
1129 unsigned long flags;
1131 local_irq_save(flags);
1133 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
1135 dev->quota += dev->weight;
1137 dev->quota = dev->weight;
1138 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
1139 local_irq_restore(flags);
1141 EXPORT_SYMBOL(__netif_rx_schedule);
1143 void dev_kfree_skb_any(struct sk_buff *skb)
1145 if (in_irq() || irqs_disabled())
1146 dev_kfree_skb_irq(skb);
1150 EXPORT_SYMBOL(dev_kfree_skb_any);
1154 void netif_device_detach(struct net_device *dev)
1156 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1157 netif_running(dev)) {
1158 netif_stop_queue(dev);
1161 EXPORT_SYMBOL(netif_device_detach);
1163 void netif_device_attach(struct net_device *dev)
1165 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1166 netif_running(dev)) {
1167 netif_wake_queue(dev);
1168 __netdev_watchdog_up(dev);
1171 EXPORT_SYMBOL(netif_device_attach);
1175 * Invalidate hardware checksum when packet is to be mangled, and
1176 * complete checksum manually on outgoing path.
1178 int skb_checksum_help(struct sk_buff *skb)
1181 int ret = 0, offset = skb->h.raw - skb->data;
1183 if (skb->ip_summed == CHECKSUM_COMPLETE)
1184 goto out_set_summed;
1186 if (unlikely(skb_shinfo(skb)->gso_size)) {
1187 /* Let GSO fix up the checksum. */
1188 goto out_set_summed;
1191 if (skb_cloned(skb)) {
1192 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1197 BUG_ON(offset > (int)skb->len);
1198 csum = skb_checksum(skb, offset, skb->len-offset, 0);
1200 offset = skb->tail - skb->h.raw;
1201 BUG_ON(offset <= 0);
1202 BUG_ON(skb->csum_offset + 2 > offset);
1204 *(__sum16*)(skb->h.raw + skb->csum_offset) = csum_fold(csum);
1207 skb->ip_summed = CHECKSUM_NONE;
1213 * skb_gso_segment - Perform segmentation on skb.
1214 * @skb: buffer to segment
1215 * @features: features for the output path (see dev->features)
1217 * This function segments the given skb and returns a list of segments.
1219 * It may return NULL if the skb requires no segmentation. This is
1220 * only possible when GSO is used for verifying header integrity.
1222 struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features)
1224 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
1225 struct packet_type *ptype;
1226 __be16 type = skb->protocol;
1229 BUG_ON(skb_shinfo(skb)->frag_list);
1231 skb->mac.raw = skb->data;
1232 skb->mac_len = skb->nh.raw - skb->data;
1233 __skb_pull(skb, skb->mac_len);
1235 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1236 if (skb_header_cloned(skb) &&
1237 (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
1238 return ERR_PTR(err);
1242 list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type) & 15], list) {
1243 if (ptype->type == type && !ptype->dev && ptype->gso_segment) {
1244 if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
1245 err = ptype->gso_send_check(skb);
1246 segs = ERR_PTR(err);
1247 if (err || skb_gso_ok(skb, features))
1249 __skb_push(skb, skb->data - skb->nh.raw);
1251 segs = ptype->gso_segment(skb, features);
1257 __skb_push(skb, skb->data - skb->mac.raw);
1262 EXPORT_SYMBOL(skb_gso_segment);
1264 /* Take action when hardware reception checksum errors are detected. */
1266 void netdev_rx_csum_fault(struct net_device *dev)
1268 if (net_ratelimit()) {
1269 printk(KERN_ERR "%s: hw csum failure.\n",
1270 dev ? dev->name : "<unknown>");
1274 EXPORT_SYMBOL(netdev_rx_csum_fault);
1277 /* Actually, we should eliminate this check as soon as we know, that:
1278 * 1. IOMMU is present and allows to map all the memory.
1279 * 2. No high memory really exists on this machine.
1282 static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1284 #ifdef CONFIG_HIGHMEM
1287 if (dev->features & NETIF_F_HIGHDMA)
1290 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1291 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1299 void (*destructor)(struct sk_buff *skb);
1302 #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb)
1304 static void dev_gso_skb_destructor(struct sk_buff *skb)
1306 struct dev_gso_cb *cb;
1309 struct sk_buff *nskb = skb->next;
1311 skb->next = nskb->next;
1314 } while (skb->next);
1316 cb = DEV_GSO_CB(skb);
1318 cb->destructor(skb);
1322 * dev_gso_segment - Perform emulated hardware segmentation on skb.
1323 * @skb: buffer to segment
1325 * This function segments the given skb and stores the list of segments
1328 static int dev_gso_segment(struct sk_buff *skb)
1330 struct net_device *dev = skb->dev;
1331 struct sk_buff *segs;
1332 int features = dev->features & ~(illegal_highdma(dev, skb) ?
1335 segs = skb_gso_segment(skb, features);
1337 /* Verifying header integrity only. */
1341 if (unlikely(IS_ERR(segs)))
1342 return PTR_ERR(segs);
1345 DEV_GSO_CB(skb)->destructor = skb->destructor;
1346 skb->destructor = dev_gso_skb_destructor;
1351 int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
1353 if (likely(!skb->next)) {
1355 dev_queue_xmit_nit(skb, dev);
1357 if (netif_needs_gso(dev, skb)) {
1358 if (unlikely(dev_gso_segment(skb)))
1364 return dev->hard_start_xmit(skb, dev);
1369 struct sk_buff *nskb = skb->next;
1372 skb->next = nskb->next;
1374 rc = dev->hard_start_xmit(nskb, dev);
1376 nskb->next = skb->next;
1380 if (unlikely(netif_queue_stopped(dev) && skb->next))
1381 return NETDEV_TX_BUSY;
1382 } while (skb->next);
1384 skb->destructor = DEV_GSO_CB(skb)->destructor;
1391 #define HARD_TX_LOCK(dev, cpu) { \
1392 if ((dev->features & NETIF_F_LLTX) == 0) { \
1393 netif_tx_lock(dev); \
1397 #define HARD_TX_UNLOCK(dev) { \
1398 if ((dev->features & NETIF_F_LLTX) == 0) { \
1399 netif_tx_unlock(dev); \
1404 inline int skb_checksum_setup(struct sk_buff *skb)
1406 if (skb->proto_csum_blank) {
1407 if (skb->protocol != htons(ETH_P_IP))
1409 skb->h.raw = (unsigned char *)skb->nh.iph + 4*skb->nh.iph->ihl;
1410 if (skb->h.raw >= skb->tail)
1412 switch (skb->nh.iph->protocol) {
1414 skb->csum = offsetof(struct tcphdr, check);
1417 skb->csum = offsetof(struct udphdr, check);
1420 if (net_ratelimit())
1421 printk(KERN_ERR "Attempting to checksum a non-"
1422 "TCP/UDP packet, dropping a protocol"
1423 " %d packet", skb->nh.iph->protocol);
1426 if ((skb->h.raw + skb->csum + 2) > skb->tail)
1428 skb->ip_summed = CHECKSUM_PARTIAL;
1429 skb->proto_csum_blank = 0;
1436 inline int skb_checksum_setup(struct sk_buff *skb) { return 0; }
1441 * dev_queue_xmit - transmit a buffer
1442 * @skb: buffer to transmit
1444 * Queue a buffer for transmission to a network device. The caller must
1445 * have set the device and priority and built the buffer before calling
1446 * this function. The function can be called from an interrupt.
1448 * A negative errno code is returned on a failure. A success does not
1449 * guarantee the frame will be transmitted as it may be dropped due
1450 * to congestion or traffic shaping.
1452 * -----------------------------------------------------------------------------------
1453 * I notice this method can also return errors from the queue disciplines,
1454 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1457 * Regardless of the return value, the skb is consumed, so it is currently
1458 * difficult to retry a send to this method. (You can bump the ref count
1459 * before sending to hold a reference for retry if you are careful.)
1461 * When calling this method, interrupts MUST be enabled. This is because
1462 * the BH enable code must have IRQs enabled so that it will not deadlock.
1466 int dev_queue_xmit(struct sk_buff *skb)
1468 struct net_device *dev = skb->dev;
1472 /* If a checksum-deferred packet is forwarded to a device that needs a
1473 * checksum, correct the pointers and force checksumming.
1475 if (skb_checksum_setup(skb))
1478 /* GSO will handle the following emulations directly. */
1479 if (netif_needs_gso(dev, skb))
1482 if (skb_shinfo(skb)->frag_list &&
1483 !(dev->features & NETIF_F_FRAGLIST) &&
1484 __skb_linearize(skb))
1487 /* Fragmented skb is linearized if device does not support SG,
1488 * or if at least one of fragments is in highmem and device
1489 * does not support DMA from it.
1491 if (skb_shinfo(skb)->nr_frags &&
1492 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1493 __skb_linearize(skb))
1496 /* If packet is not checksummed and device does not support
1497 * checksumming for this protocol, complete checksumming here.
1499 if (skb->ip_summed == CHECKSUM_PARTIAL &&
1500 (!(dev->features & NETIF_F_GEN_CSUM) &&
1501 (!(dev->features & NETIF_F_IP_CSUM) ||
1502 skb->protocol != htons(ETH_P_IP))))
1503 if (skb_checksum_help(skb))
1507 spin_lock_prefetch(&dev->queue_lock);
1509 /* Disable soft irqs for various locks below. Also
1510 * stops preemption for RCU.
1514 /* Updates of qdisc are serialized by queue_lock.
1515 * The struct Qdisc which is pointed to by qdisc is now a
1516 * rcu structure - it may be accessed without acquiring
1517 * a lock (but the structure may be stale.) The freeing of the
1518 * qdisc will be deferred until it's known that there are no
1519 * more references to it.
1521 * If the qdisc has an enqueue function, we still need to
1522 * hold the queue_lock before calling it, since queue_lock
1523 * also serializes access to the device queue.
1526 q = rcu_dereference(dev->qdisc);
1527 #ifdef CONFIG_NET_CLS_ACT
1528 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1531 /* Grab device queue */
1532 spin_lock(&dev->queue_lock);
1535 rc = q->enqueue(skb, q);
1537 spin_unlock(&dev->queue_lock);
1539 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1542 spin_unlock(&dev->queue_lock);
1545 /* The device has no queue. Common case for software devices:
1546 loopback, all the sorts of tunnels...
1548 Really, it is unlikely that netif_tx_lock protection is necessary
1549 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1551 However, it is possible, that they rely on protection
1554 Check this and shot the lock. It is not prone from deadlocks.
1555 Either shot noqueue qdisc, it is even simpler 8)
1557 if (dev->flags & IFF_UP) {
1558 int cpu = smp_processor_id(); /* ok because BHs are off */
1560 if (dev->xmit_lock_owner != cpu) {
1562 HARD_TX_LOCK(dev, cpu);
1564 if (!netif_queue_stopped(dev)) {
1566 if (!dev_hard_start_xmit(skb, dev)) {
1567 HARD_TX_UNLOCK(dev);
1571 HARD_TX_UNLOCK(dev);
1572 if (net_ratelimit())
1573 printk(KERN_CRIT "Virtual device %s asks to "
1574 "queue packet!\n", dev->name);
1576 /* Recursion is detected! It is possible,
1578 if (net_ratelimit())
1579 printk(KERN_CRIT "Dead loop on virtual device "
1580 "%s, fix it urgently!\n", dev->name);
1585 rcu_read_unlock_bh();
1591 rcu_read_unlock_bh();
1596 /*=======================================================================
1598 =======================================================================*/
1600 int netdev_max_backlog = 1000;
1601 int netdev_budget = 300;
1602 int weight_p = 64; /* old backlog weight */
1604 DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1608 * netif_rx - post buffer to the network code
1609 * @skb: buffer to post
1611 * This function receives a packet from a device driver and queues it for
1612 * the upper (protocol) levels to process. It always succeeds. The buffer
1613 * may be dropped during processing for congestion control or by the
1617 * NET_RX_SUCCESS (no congestion)
1618 * NET_RX_CN_LOW (low congestion)
1619 * NET_RX_CN_MOD (moderate congestion)
1620 * NET_RX_CN_HIGH (high congestion)
1621 * NET_RX_DROP (packet was dropped)
1625 int netif_rx(struct sk_buff *skb)
1627 struct softnet_data *queue;
1628 unsigned long flags;
1630 /* if netpoll wants it, pretend we never saw it */
1631 if (netpoll_rx(skb))
1634 if (!skb->tstamp.off_sec)
1638 * The code is rearranged so that the path is the most
1639 * short when CPU is congested, but is still operating.
1641 local_irq_save(flags);
1642 queue = &__get_cpu_var(softnet_data);
1644 __get_cpu_var(netdev_rx_stat).total++;
1645 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1646 if (queue->input_pkt_queue.qlen) {
1649 __skb_queue_tail(&queue->input_pkt_queue, skb);
1650 local_irq_restore(flags);
1651 return NET_RX_SUCCESS;
1654 netif_rx_schedule(&queue->backlog_dev);
1658 __get_cpu_var(netdev_rx_stat).dropped++;
1659 local_irq_restore(flags);
1665 int netif_rx_ni(struct sk_buff *skb)
1670 err = netif_rx(skb);
1671 if (local_softirq_pending())
1678 EXPORT_SYMBOL(netif_rx_ni);
1680 static inline struct net_device *skb_bond(struct sk_buff *skb)
1682 struct net_device *dev = skb->dev;
1685 if (skb_bond_should_drop(skb)) {
1689 skb->dev = dev->master;
1695 static void net_tx_action(struct softirq_action *h)
1697 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1699 if (sd->completion_queue) {
1700 struct sk_buff *clist;
1702 local_irq_disable();
1703 clist = sd->completion_queue;
1704 sd->completion_queue = NULL;
1708 struct sk_buff *skb = clist;
1709 clist = clist->next;
1711 BUG_TRAP(!atomic_read(&skb->users));
1716 if (sd->output_queue) {
1717 struct net_device *head;
1719 local_irq_disable();
1720 head = sd->output_queue;
1721 sd->output_queue = NULL;
1725 struct net_device *dev = head;
1726 head = head->next_sched;
1728 smp_mb__before_clear_bit();
1729 clear_bit(__LINK_STATE_SCHED, &dev->state);
1731 if (spin_trylock(&dev->queue_lock)) {
1733 spin_unlock(&dev->queue_lock);
1735 netif_schedule(dev);
1741 static __inline__ int deliver_skb(struct sk_buff *skb,
1742 struct packet_type *pt_prev,
1743 struct net_device *orig_dev)
1745 atomic_inc(&skb->users);
1746 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1749 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1750 int (*br_handle_frame_hook)(struct net_bridge_port *p, struct sk_buff **pskb);
1752 struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1753 unsigned char *addr);
1754 void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
1756 static __inline__ int handle_bridge(struct sk_buff **pskb,
1757 struct packet_type **pt_prev, int *ret,
1758 struct net_device *orig_dev)
1760 struct net_bridge_port *port;
1762 if ((*pskb)->pkt_type == PACKET_LOOPBACK ||
1763 (port = rcu_dereference((*pskb)->dev->br_port)) == NULL)
1767 *ret = deliver_skb(*pskb, *pt_prev, orig_dev);
1771 return br_handle_frame_hook(port, pskb);
1774 #define handle_bridge(skb, pt_prev, ret, orig_dev) (0)
1777 #ifdef CONFIG_NET_CLS_ACT
1778 /* TODO: Maybe we should just force sch_ingress to be compiled in
1779 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
1780 * a compare and 2 stores extra right now if we dont have it on
1781 * but have CONFIG_NET_CLS_ACT
1782 * NOTE: This doesnt stop any functionality; if you dont have
1783 * the ingress scheduler, you just cant add policies on ingress.
1786 static int ing_filter(struct sk_buff *skb)
1789 struct net_device *dev = skb->dev;
1790 int result = TC_ACT_OK;
1792 if (dev->qdisc_ingress) {
1793 __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
1794 if (MAX_RED_LOOP < ttl++) {
1795 printk(KERN_WARNING "Redir loop detected Dropping packet (%d->%d)\n",
1796 skb->iif, skb->dev->ifindex);
1800 skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl);
1802 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS);
1804 spin_lock(&dev->queue_lock);
1805 if ((q = dev->qdisc_ingress) != NULL)
1806 result = q->enqueue(skb, q);
1807 spin_unlock(&dev->queue_lock);
1815 int netif_receive_skb(struct sk_buff *skb)
1817 struct packet_type *ptype, *pt_prev;
1818 struct net_device *orig_dev;
1819 int ret = NET_RX_DROP;
1822 /* if we've gotten here through NAPI, check netpoll */
1823 if (skb->dev->poll && netpoll_rx(skb))
1826 if (!skb->tstamp.off_sec)
1830 skb->iif = skb->dev->ifindex;
1832 orig_dev = skb_bond(skb);
1837 __get_cpu_var(netdev_rx_stat).total++;
1839 skb->h.raw = skb->nh.raw = skb->data;
1840 skb->mac_len = skb->nh.raw - skb->mac.raw;
1846 #ifdef CONFIG_NET_CLS_ACT
1847 if (skb->tc_verd & TC_NCLS) {
1848 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
1854 switch (skb->ip_summed) {
1855 case CHECKSUM_UNNECESSARY:
1856 skb->proto_data_valid = 1;
1858 case CHECKSUM_PARTIAL:
1859 /* XXX Implement me. */
1861 skb->proto_data_valid = 0;
1866 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1867 if (!ptype->dev || ptype->dev == skb->dev) {
1869 ret = deliver_skb(skb, pt_prev, orig_dev);
1874 #ifdef CONFIG_NET_CLS_ACT
1876 ret = deliver_skb(skb, pt_prev, orig_dev);
1877 pt_prev = NULL; /* noone else should process this after*/
1879 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
1882 ret = ing_filter(skb);
1884 if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
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);
2971 /* Init, if this function is available */
2973 ret = dev->init(dev);
2981 if (!dev_valid_name(dev->name)) {
2986 dev->ifindex = dev_new_index();
2987 if (dev->iflink == -1)
2988 dev->iflink = dev->ifindex;
2990 /* Check for existence of name */
2991 head = dev_name_hash(dev->name);
2992 hlist_for_each(p, head) {
2993 struct net_device *d
2994 = hlist_entry(p, struct net_device, name_hlist);
2995 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
3001 /* Fix illegal SG+CSUM combinations. */
3002 if ((dev->features & NETIF_F_SG) &&
3003 !(dev->features & NETIF_F_ALL_CSUM)) {
3004 printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n",
3006 dev->features &= ~NETIF_F_SG;
3009 /* TSO requires that SG is present as well. */
3010 if ((dev->features & NETIF_F_TSO) &&
3011 !(dev->features & NETIF_F_SG)) {
3012 printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n",
3014 dev->features &= ~NETIF_F_TSO;
3016 if (dev->features & NETIF_F_UFO) {
3017 if (!(dev->features & NETIF_F_HW_CSUM)) {
3018 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3019 "NETIF_F_HW_CSUM feature.\n",
3021 dev->features &= ~NETIF_F_UFO;
3023 if (!(dev->features & NETIF_F_SG)) {
3024 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
3025 "NETIF_F_SG feature.\n",
3027 dev->features &= ~NETIF_F_UFO;
3032 * nil rebuild_header routine,
3033 * that should be never called and used as just bug trap.
3036 if (!dev->rebuild_header)
3037 dev->rebuild_header = default_rebuild_header;
3039 ret = netdev_register_sysfs(dev);
3042 dev->reg_state = NETREG_REGISTERED;
3045 * Default initial state at registry is that the
3046 * device is present.
3049 set_bit(__LINK_STATE_PRESENT, &dev->state);
3052 dev_init_scheduler(dev);
3053 write_lock_bh(&dev_base_lock);
3055 dev_tail = &dev->next;
3056 hlist_add_head(&dev->name_hlist, head);
3057 hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex));
3059 write_unlock_bh(&dev_base_lock);
3061 /* Notify protocols, that a new device appeared. */
3062 raw_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
3071 * register_netdev - register a network device
3072 * @dev: device to register
3074 * Take a completed network device structure and add it to the kernel
3075 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
3076 * chain. 0 is returned on success. A negative errno code is returned
3077 * on a failure to set up the device, or if the name is a duplicate.
3079 * This is a wrapper around register_netdev that takes the rtnl semaphore
3080 * and expands the device name if you passed a format string to
3083 int register_netdev(struct net_device *dev)
3090 * If the name is a format string the caller wants us to do a
3093 if (strchr(dev->name, '%')) {
3094 err = dev_alloc_name(dev, dev->name);
3099 err = register_netdevice(dev);
3104 EXPORT_SYMBOL(register_netdev);
3107 * netdev_wait_allrefs - wait until all references are gone.
3109 * This is called when unregistering network devices.
3111 * Any protocol or device that holds a reference should register
3112 * for netdevice notification, and cleanup and put back the
3113 * reference if they receive an UNREGISTER event.
3114 * We can get stuck here if buggy protocols don't correctly
3117 static void netdev_wait_allrefs(struct net_device *dev)
3119 unsigned long rebroadcast_time, warning_time;
3121 rebroadcast_time = warning_time = jiffies;
3122 while (atomic_read(&dev->refcnt) != 0) {
3123 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
3126 /* Rebroadcast unregister notification */
3127 raw_notifier_call_chain(&netdev_chain,
3128 NETDEV_UNREGISTER, dev);
3130 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
3132 /* We must not have linkwatch events
3133 * pending on unregister. If this
3134 * happens, we simply run the queue
3135 * unscheduled, resulting in a noop
3138 linkwatch_run_queue();
3143 rebroadcast_time = jiffies;
3148 if (time_after(jiffies, warning_time + 10 * HZ)) {
3149 printk(KERN_EMERG "unregister_netdevice: "
3150 "waiting for %s to become free. Usage "
3152 dev->name, atomic_read(&dev->refcnt));
3153 warning_time = jiffies;
3162 * register_netdevice(x1);
3163 * register_netdevice(x2);
3165 * unregister_netdevice(y1);
3166 * unregister_netdevice(y2);
3172 * We are invoked by rtnl_unlock() after it drops the semaphore.
3173 * This allows us to deal with problems:
3174 * 1) We can delete sysfs objects which invoke hotplug
3175 * without deadlocking with linkwatch via keventd.
3176 * 2) Since we run with the RTNL semaphore not held, we can sleep
3177 * safely in order to wait for the netdev refcnt to drop to zero.
3179 static DEFINE_MUTEX(net_todo_run_mutex);
3180 void netdev_run_todo(void)
3182 struct list_head list;
3184 /* Need to guard against multiple cpu's getting out of order. */
3185 mutex_lock(&net_todo_run_mutex);
3187 /* Not safe to do outside the semaphore. We must not return
3188 * until all unregister events invoked by the local processor
3189 * have been completed (either by this todo run, or one on
3192 if (list_empty(&net_todo_list))
3195 /* Snapshot list, allow later requests */
3196 spin_lock(&net_todo_list_lock);
3197 list_replace_init(&net_todo_list, &list);
3198 spin_unlock(&net_todo_list_lock);
3200 while (!list_empty(&list)) {
3201 struct net_device *dev
3202 = list_entry(list.next, struct net_device, todo_list);
3203 list_del(&dev->todo_list);
3205 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
3206 printk(KERN_ERR "network todo '%s' but state %d\n",
3207 dev->name, dev->reg_state);
3212 netdev_unregister_sysfs(dev);
3213 dev->reg_state = NETREG_UNREGISTERED;
3215 netdev_wait_allrefs(dev);
3218 BUG_ON(atomic_read(&dev->refcnt));
3219 BUG_TRAP(!dev->ip_ptr);
3220 BUG_TRAP(!dev->ip6_ptr);
3221 BUG_TRAP(!dev->dn_ptr);
3223 /* It must be the very last action,
3224 * after this 'dev' may point to freed up memory.
3226 if (dev->destructor)
3227 dev->destructor(dev);
3231 mutex_unlock(&net_todo_run_mutex);
3235 * alloc_netdev - allocate network device
3236 * @sizeof_priv: size of private data to allocate space for
3237 * @name: device name format string
3238 * @setup: callback to initialize device
3240 * Allocates a struct net_device with private data area for driver use
3241 * and performs basic initialization.
3243 struct net_device *alloc_netdev(int sizeof_priv, const char *name,
3244 void (*setup)(struct net_device *))
3247 struct net_device *dev;
3250 BUG_ON(strlen(name) >= sizeof(dev->name));
3252 /* ensure 32-byte alignment of both the device and private area */
3253 alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
3254 alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
3256 p = kzalloc(alloc_size, GFP_KERNEL);
3258 printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
3262 dev = (struct net_device *)
3263 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
3264 dev->padded = (char *)dev - (char *)p;
3267 dev->priv = netdev_priv(dev);
3270 strcpy(dev->name, name);
3273 EXPORT_SYMBOL(alloc_netdev);
3276 * free_netdev - free network device
3279 * This function does the last stage of destroying an allocated device
3280 * interface. The reference to the device object is released.
3281 * If this is the last reference then it will be freed.
3283 void free_netdev(struct net_device *dev)
3286 /* Compatibility with error handling in drivers */
3287 if (dev->reg_state == NETREG_UNINITIALIZED) {
3288 kfree((char *)dev - dev->padded);
3292 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
3293 dev->reg_state = NETREG_RELEASED;
3295 /* will free via class release */
3296 class_device_put(&dev->class_dev);
3298 kfree((char *)dev - dev->padded);
3302 /* Synchronize with packet receive processing. */
3303 void synchronize_net(void)
3310 * unregister_netdevice - remove device from the kernel
3313 * This function shuts down a device interface and removes it
3314 * from the kernel tables. On success 0 is returned, on a failure
3315 * a negative errno code is returned.
3317 * Callers must hold the rtnl semaphore. You may want
3318 * unregister_netdev() instead of this.
3321 int unregister_netdevice(struct net_device *dev)
3323 struct net_device *d, **dp;
3325 BUG_ON(dev_boot_phase);
3328 /* Some devices call without registering for initialization unwind. */
3329 if (dev->reg_state == NETREG_UNINITIALIZED) {
3330 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3331 "was registered\n", dev->name, dev);
3335 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3337 /* If device is running, close it first. */
3338 if (dev->flags & IFF_UP)
3341 /* And unlink it from device chain. */
3342 for (dp = &dev_base; (d = *dp) != NULL; dp = &d->next) {
3344 write_lock_bh(&dev_base_lock);
3345 hlist_del(&dev->name_hlist);
3346 hlist_del(&dev->index_hlist);
3347 if (dev_tail == &dev->next)
3350 write_unlock_bh(&dev_base_lock);
3355 printk(KERN_ERR "unregister net_device: '%s' not found\n",
3360 dev->reg_state = NETREG_UNREGISTERING;
3364 /* Shutdown queueing discipline. */
3368 /* Notify protocols, that we are about to destroy
3369 this device. They should clean all the things.
3371 raw_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
3374 * Flush the multicast chain
3376 dev_mc_discard(dev);
3381 /* Notifier chain MUST detach us from master device. */
3382 BUG_TRAP(!dev->master);
3384 /* Finish processing unregister after unlock */
3394 * unregister_netdev - remove device from the kernel
3397 * This function shuts down a device interface and removes it
3398 * from the kernel tables. On success 0 is returned, on a failure
3399 * a negative errno code is returned.
3401 * This is just a wrapper for unregister_netdevice that takes
3402 * the rtnl semaphore. In general you want to use this and not
3403 * unregister_netdevice.
3405 void unregister_netdev(struct net_device *dev)
3408 unregister_netdevice(dev);
3412 EXPORT_SYMBOL(unregister_netdev);
3414 static int dev_cpu_callback(struct notifier_block *nfb,
3415 unsigned long action,
3418 struct sk_buff **list_skb;
3419 struct net_device **list_net;
3420 struct sk_buff *skb;
3421 unsigned int cpu, oldcpu = (unsigned long)ocpu;
3422 struct softnet_data *sd, *oldsd;
3424 if (action != CPU_DEAD)
3427 local_irq_disable();
3428 cpu = smp_processor_id();
3429 sd = &per_cpu(softnet_data, cpu);
3430 oldsd = &per_cpu(softnet_data, oldcpu);
3432 /* Find end of our completion_queue. */
3433 list_skb = &sd->completion_queue;
3435 list_skb = &(*list_skb)->next;
3436 /* Append completion queue from offline CPU. */
3437 *list_skb = oldsd->completion_queue;
3438 oldsd->completion_queue = NULL;
3440 /* Find end of our output_queue. */
3441 list_net = &sd->output_queue;
3443 list_net = &(*list_net)->next_sched;
3444 /* Append output queue from offline CPU. */
3445 *list_net = oldsd->output_queue;
3446 oldsd->output_queue = NULL;
3448 raise_softirq_irqoff(NET_TX_SOFTIRQ);
3451 /* Process offline CPU's input_pkt_queue */
3452 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
3458 #ifdef CONFIG_NET_DMA
3460 * net_dma_rebalance -
3461 * This is called when the number of channels allocated to the net_dma_client
3462 * changes. The net_dma_client tries to have one DMA channel per CPU.
3464 static void net_dma_rebalance(void)
3466 unsigned int cpu, i, n;
3467 struct dma_chan *chan;
3469 if (net_dma_count == 0) {
3470 for_each_online_cpu(cpu)
3471 rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL);
3476 cpu = first_cpu(cpu_online_map);
3479 list_for_each_entry(chan, &net_dma_client->channels, client_node) {
3480 n = ((num_online_cpus() / net_dma_count)
3481 + (i < (num_online_cpus() % net_dma_count) ? 1 : 0));
3484 per_cpu(softnet_data, cpu).net_dma = chan;
3485 cpu = next_cpu(cpu, cpu_online_map);
3494 * netdev_dma_event - event callback for the net_dma_client
3495 * @client: should always be net_dma_client
3496 * @chan: DMA channel for the event
3497 * @event: event type
3499 static void netdev_dma_event(struct dma_client *client, struct dma_chan *chan,
3500 enum dma_event event)
3502 spin_lock(&net_dma_event_lock);
3504 case DMA_RESOURCE_ADDED:
3506 net_dma_rebalance();
3508 case DMA_RESOURCE_REMOVED:
3510 net_dma_rebalance();
3515 spin_unlock(&net_dma_event_lock);
3519 * netdev_dma_regiser - register the networking subsystem as a DMA client
3521 static int __init netdev_dma_register(void)
3523 spin_lock_init(&net_dma_event_lock);
3524 net_dma_client = dma_async_client_register(netdev_dma_event);
3525 if (net_dma_client == NULL)
3528 dma_async_client_chan_request(net_dma_client, num_online_cpus());
3533 static int __init netdev_dma_register(void) { return -ENODEV; }
3534 #endif /* CONFIG_NET_DMA */
3537 * Initialize the DEV module. At boot time this walks the device list and
3538 * unhooks any devices that fail to initialise (normally hardware not
3539 * present) and leaves us with a valid list of present and active devices.
3544 * This is called single threaded during boot, so no need
3545 * to take the rtnl semaphore.
3547 static int __init net_dev_init(void)
3549 int i, rc = -ENOMEM;
3551 BUG_ON(!dev_boot_phase);
3553 if (dev_proc_init())
3556 if (netdev_sysfs_init())
3559 INIT_LIST_HEAD(&ptype_all);
3560 for (i = 0; i < 16; i++)
3561 INIT_LIST_HEAD(&ptype_base[i]);
3563 for (i = 0; i < ARRAY_SIZE(dev_name_head); i++)
3564 INIT_HLIST_HEAD(&dev_name_head[i]);
3566 for (i = 0; i < ARRAY_SIZE(dev_index_head); i++)
3567 INIT_HLIST_HEAD(&dev_index_head[i]);
3570 * Initialise the packet receive queues.
3573 for_each_possible_cpu(i) {
3574 struct softnet_data *queue;
3576 queue = &per_cpu(softnet_data, i);
3577 skb_queue_head_init(&queue->input_pkt_queue);
3578 queue->completion_queue = NULL;
3579 INIT_LIST_HEAD(&queue->poll_list);
3580 set_bit(__LINK_STATE_START, &queue->backlog_dev.state);
3581 queue->backlog_dev.weight = weight_p;
3582 queue->backlog_dev.poll = process_backlog;
3583 atomic_set(&queue->backlog_dev.refcnt, 1);
3586 netdev_dma_register();
3590 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
3591 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
3593 hotcpu_notifier(dev_cpu_callback, 0);
3601 subsys_initcall(net_dev_init);
3603 EXPORT_SYMBOL(__dev_get_by_index);
3604 EXPORT_SYMBOL(__dev_get_by_name);
3605 EXPORT_SYMBOL(__dev_remove_pack);
3606 EXPORT_SYMBOL(dev_valid_name);
3607 EXPORT_SYMBOL(dev_add_pack);
3608 EXPORT_SYMBOL(dev_alloc_name);
3609 EXPORT_SYMBOL(dev_close);
3610 EXPORT_SYMBOL(dev_get_by_flags);
3611 EXPORT_SYMBOL(dev_get_by_index);
3612 EXPORT_SYMBOL(dev_get_by_name);
3613 EXPORT_SYMBOL(dev_open);
3614 EXPORT_SYMBOL(dev_queue_xmit);
3615 EXPORT_SYMBOL(dev_remove_pack);
3616 EXPORT_SYMBOL(dev_set_allmulti);
3617 EXPORT_SYMBOL(dev_set_promiscuity);
3618 EXPORT_SYMBOL(dev_change_flags);
3619 EXPORT_SYMBOL(dev_set_mtu);
3620 EXPORT_SYMBOL(dev_set_mac_address);
3621 EXPORT_SYMBOL(free_netdev);
3622 EXPORT_SYMBOL(netdev_boot_setup_check);
3623 EXPORT_SYMBOL(netdev_set_master);
3624 EXPORT_SYMBOL(netdev_state_change);
3625 EXPORT_SYMBOL(netif_receive_skb);
3626 EXPORT_SYMBOL(netif_rx);
3627 EXPORT_SYMBOL(register_gifconf);
3628 EXPORT_SYMBOL(register_netdevice);
3629 EXPORT_SYMBOL(register_netdevice_notifier);
3630 EXPORT_SYMBOL(skb_checksum_help);
3631 EXPORT_SYMBOL(synchronize_net);
3632 EXPORT_SYMBOL(unregister_netdevice);
3633 EXPORT_SYMBOL(unregister_netdevice_notifier);
3634 EXPORT_SYMBOL(net_enable_timestamp);
3635 EXPORT_SYMBOL(net_disable_timestamp);
3636 EXPORT_SYMBOL(dev_get_flags);
3637 EXPORT_SYMBOL(skb_checksum_setup);
3639 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
3640 EXPORT_SYMBOL(br_handle_frame_hook);
3641 EXPORT_SYMBOL(br_fdb_get_hook);
3642 EXPORT_SYMBOL(br_fdb_put_hook);
3646 EXPORT_SYMBOL(dev_load);
3649 EXPORT_PER_CPU_SYMBOL(softnet_data);