2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <asm/system.h>
77 #include <linux/bitops.h>
78 #include <linux/capability.h>
79 #include <linux/config.h>
80 #include <linux/cpu.h>
81 #include <linux/types.h>
82 #include <linux/kernel.h>
83 #include <linux/sched.h>
84 #include <linux/mutex.h>
85 #include <linux/string.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/errno.h>
90 #include <linux/interrupt.h>
91 #include <linux/if_ether.h>
92 #include <linux/netdevice.h>
93 #include <linux/etherdevice.h>
94 #include <linux/notifier.h>
95 #include <linux/skbuff.h>
97 #include <linux/rtnetlink.h>
98 #include <linux/proc_fs.h>
99 #include <linux/seq_file.h>
100 #include <linux/stat.h>
101 #include <linux/if_bridge.h>
102 #include <linux/divert.h>
104 #include <net/pkt_sched.h>
105 #include <net/checksum.h>
106 #include <linux/highmem.h>
107 #include <linux/init.h>
108 #include <linux/kmod.h>
109 #include <linux/module.h>
110 #include <linux/kallsyms.h>
111 #include <linux/netpoll.h>
112 #include <linux/rcupdate.h>
113 #include <linux/delay.h>
114 #include <linux/wireless.h>
115 #include <net/iw_handler.h>
116 #include <asm/current.h>
117 #include <linux/audit.h>
118 #include <linux/dmaengine.h>
121 * The list of packet types we will receive (as opposed to discard)
122 * and the routines to invoke.
124 * Why 16. Because with 16 the only overlap we get on a hash of the
125 * low nibble of the protocol value is RARP/SNAP/X.25.
127 * NOTE: That is no longer true with the addition of VLAN tags. Not
128 * sure which should go first, but I bet it won't make much
129 * difference if we are running VLANs. The good news is that
130 * this protocol won't be in the list unless compiled in, so
131 * the average user (w/out VLANs) will not be adversely affected.
148 static DEFINE_SPINLOCK(ptype_lock
);
149 static struct list_head ptype_base
[16]; /* 16 way hashed list */
150 static struct list_head ptype_all
; /* Taps */
152 #ifdef CONFIG_NET_DMA
153 static struct dma_client
*net_dma_client
;
154 static unsigned int net_dma_count
;
155 static spinlock_t net_dma_event_lock
;
159 * The @dev_base list is protected by @dev_base_lock and the rtnl
162 * Pure readers hold dev_base_lock for reading.
164 * Writers must hold the rtnl semaphore while they loop through the
165 * dev_base list, and hold dev_base_lock for writing when they do the
166 * actual updates. This allows pure readers to access the list even
167 * while a writer is preparing to update it.
169 * To put it another way, dev_base_lock is held for writing only to
170 * protect against pure readers; the rtnl semaphore provides the
171 * protection against other writers.
173 * See, for example usages, register_netdevice() and
174 * unregister_netdevice(), which must be called with the rtnl
177 struct net_device
*dev_base
;
178 static struct net_device
**dev_tail
= &dev_base
;
179 DEFINE_RWLOCK(dev_base_lock
);
181 EXPORT_SYMBOL(dev_base
);
182 EXPORT_SYMBOL(dev_base_lock
);
184 #define NETDEV_HASHBITS 8
185 static struct hlist_head dev_name_head
[1<<NETDEV_HASHBITS
];
186 static struct hlist_head dev_index_head
[1<<NETDEV_HASHBITS
];
188 static inline struct hlist_head
*dev_name_hash(const char *name
)
190 unsigned hash
= full_name_hash(name
, strnlen(name
, IFNAMSIZ
));
191 return &dev_name_head
[hash
& ((1<<NETDEV_HASHBITS
)-1)];
194 static inline struct hlist_head
*dev_index_hash(int ifindex
)
196 return &dev_index_head
[ifindex
& ((1<<NETDEV_HASHBITS
)-1)];
203 static RAW_NOTIFIER_HEAD(netdev_chain
);
206 * Device drivers call our routines to queue packets here. We empty the
207 * queue in the local softnet handler.
209 DEFINE_PER_CPU(struct softnet_data
, softnet_data
) = { NULL
};
212 extern int netdev_sysfs_init(void);
213 extern int netdev_register_sysfs(struct net_device
*);
214 extern void netdev_unregister_sysfs(struct net_device
*);
216 #define netdev_sysfs_init() (0)
217 #define netdev_register_sysfs(dev) (0)
218 #define netdev_unregister_sysfs(dev) do { } while(0)
222 /*******************************************************************************
224 Protocol management and registration routines
226 *******************************************************************************/
235 * Add a protocol ID to the list. Now that the input handler is
236 * smarter we can dispense with all the messy stuff that used to be
239 * BEWARE!!! Protocol handlers, mangling input packets,
240 * MUST BE last in hash buckets and checking protocol handlers
241 * MUST start from promiscuous ptype_all chain in net_bh.
242 * It is true now, do not change it.
243 * Explanation follows: if protocol handler, mangling packet, will
244 * be the first on list, it is not able to sense, that packet
245 * is cloned and should be copied-on-write, so that it will
246 * change it and subsequent readers will get broken packet.
251 * dev_add_pack - add packet handler
252 * @pt: packet type declaration
254 * Add a protocol handler to the networking stack. The passed &packet_type
255 * is linked into kernel lists and may not be freed until it has been
256 * removed from the kernel lists.
258 * This call does not sleep therefore it can not
259 * guarantee all CPU's that are in middle of receiving packets
260 * will see the new packet type (until the next received packet).
263 void dev_add_pack(struct packet_type
*pt
)
267 spin_lock_bh(&ptype_lock
);
268 if (pt
->type
== htons(ETH_P_ALL
)) {
270 list_add_rcu(&pt
->list
, &ptype_all
);
272 hash
= ntohs(pt
->type
) & 15;
273 list_add_rcu(&pt
->list
, &ptype_base
[hash
]);
275 spin_unlock_bh(&ptype_lock
);
279 * __dev_remove_pack - remove packet handler
280 * @pt: packet type declaration
282 * Remove a protocol handler that was previously added to the kernel
283 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
284 * from the kernel lists and can be freed or reused once this function
287 * The packet type might still be in use by receivers
288 * and must not be freed until after all the CPU's have gone
289 * through a quiescent state.
291 void __dev_remove_pack(struct packet_type
*pt
)
293 struct list_head
*head
;
294 struct packet_type
*pt1
;
296 spin_lock_bh(&ptype_lock
);
298 if (pt
->type
== htons(ETH_P_ALL
)) {
302 head
= &ptype_base
[ntohs(pt
->type
) & 15];
304 list_for_each_entry(pt1
, head
, list
) {
306 list_del_rcu(&pt
->list
);
311 printk(KERN_WARNING
"dev_remove_pack: %p not found.\n", pt
);
313 spin_unlock_bh(&ptype_lock
);
316 * dev_remove_pack - remove packet handler
317 * @pt: packet type declaration
319 * Remove a protocol handler that was previously added to the kernel
320 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
321 * from the kernel lists and can be freed or reused once this function
324 * This call sleeps to guarantee that no CPU is looking at the packet
327 void dev_remove_pack(struct packet_type
*pt
)
329 __dev_remove_pack(pt
);
334 /******************************************************************************
336 Device Boot-time Settings Routines
338 *******************************************************************************/
340 /* Boot time configuration table */
341 static struct netdev_boot_setup dev_boot_setup
[NETDEV_BOOT_SETUP_MAX
];
344 * netdev_boot_setup_add - add new setup entry
345 * @name: name of the device
346 * @map: configured settings for the device
348 * Adds new setup entry to the dev_boot_setup list. The function
349 * returns 0 on error and 1 on success. This is a generic routine to
352 static int netdev_boot_setup_add(char *name
, struct ifmap
*map
)
354 struct netdev_boot_setup
*s
;
358 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
359 if (s
[i
].name
[0] == '\0' || s
[i
].name
[0] == ' ') {
360 memset(s
[i
].name
, 0, sizeof(s
[i
].name
));
361 strcpy(s
[i
].name
, name
);
362 memcpy(&s
[i
].map
, map
, sizeof(s
[i
].map
));
367 return i
>= NETDEV_BOOT_SETUP_MAX
? 0 : 1;
371 * netdev_boot_setup_check - check boot time settings
372 * @dev: the netdevice
374 * Check boot time settings for the device.
375 * The found settings are set for the device to be used
376 * later in the device probing.
377 * Returns 0 if no settings found, 1 if they are.
379 int netdev_boot_setup_check(struct net_device
*dev
)
381 struct netdev_boot_setup
*s
= dev_boot_setup
;
384 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++) {
385 if (s
[i
].name
[0] != '\0' && s
[i
].name
[0] != ' ' &&
386 !strncmp(dev
->name
, s
[i
].name
, strlen(s
[i
].name
))) {
387 dev
->irq
= s
[i
].map
.irq
;
388 dev
->base_addr
= s
[i
].map
.base_addr
;
389 dev
->mem_start
= s
[i
].map
.mem_start
;
390 dev
->mem_end
= s
[i
].map
.mem_end
;
399 * netdev_boot_base - get address from boot time settings
400 * @prefix: prefix for network device
401 * @unit: id for network device
403 * Check boot time settings for the base address of device.
404 * The found settings are set for the device to be used
405 * later in the device probing.
406 * Returns 0 if no settings found.
408 unsigned long netdev_boot_base(const char *prefix
, int unit
)
410 const struct netdev_boot_setup
*s
= dev_boot_setup
;
414 sprintf(name
, "%s%d", prefix
, unit
);
417 * If device already registered then return base of 1
418 * to indicate not to probe for this interface
420 if (__dev_get_by_name(name
))
423 for (i
= 0; i
< NETDEV_BOOT_SETUP_MAX
; i
++)
424 if (!strcmp(name
, s
[i
].name
))
425 return s
[i
].map
.base_addr
;
430 * Saves at boot time configured settings for any netdevice.
432 int __init
netdev_boot_setup(char *str
)
437 str
= get_options(str
, ARRAY_SIZE(ints
), ints
);
442 memset(&map
, 0, sizeof(map
));
446 map
.base_addr
= ints
[2];
448 map
.mem_start
= ints
[3];
450 map
.mem_end
= ints
[4];
452 /* Add new entry to the list */
453 return netdev_boot_setup_add(str
, &map
);
456 __setup("netdev=", netdev_boot_setup
);
458 /*******************************************************************************
460 Device Interface Subroutines
462 *******************************************************************************/
465 * __dev_get_by_name - find a device by its name
466 * @name: name to find
468 * Find an interface by name. Must be called under RTNL semaphore
469 * or @dev_base_lock. If the name is found a pointer to the device
470 * is returned. If the name is not found then %NULL is returned. The
471 * reference counters are not incremented so the caller must be
472 * careful with locks.
475 struct net_device
*__dev_get_by_name(const char *name
)
477 struct hlist_node
*p
;
479 hlist_for_each(p
, dev_name_hash(name
)) {
480 struct net_device
*dev
481 = hlist_entry(p
, struct net_device
, name_hlist
);
482 if (!strncmp(dev
->name
, name
, IFNAMSIZ
))
489 * dev_get_by_name - find a device by its name
490 * @name: name to find
492 * Find an interface by name. This can be called from any
493 * context and does its own locking. The returned handle has
494 * the usage count incremented and the caller must use dev_put() to
495 * release it when it is no longer needed. %NULL is returned if no
496 * matching device is found.
499 struct net_device
*dev_get_by_name(const char *name
)
501 struct net_device
*dev
;
503 read_lock(&dev_base_lock
);
504 dev
= __dev_get_by_name(name
);
507 read_unlock(&dev_base_lock
);
512 * __dev_get_by_index - find a device by its ifindex
513 * @ifindex: index of device
515 * Search for an interface by index. Returns %NULL if the device
516 * is not found or a pointer to the device. The device has not
517 * had its reference counter increased so the caller must be careful
518 * about locking. The caller must hold either the RTNL semaphore
522 struct net_device
*__dev_get_by_index(int ifindex
)
524 struct hlist_node
*p
;
526 hlist_for_each(p
, dev_index_hash(ifindex
)) {
527 struct net_device
*dev
528 = hlist_entry(p
, struct net_device
, index_hlist
);
529 if (dev
->ifindex
== ifindex
)
537 * dev_get_by_index - find a device by its ifindex
538 * @ifindex: index of device
540 * Search for an interface by index. Returns NULL if the device
541 * is not found or a pointer to the device. The device returned has
542 * had a reference added and the pointer is safe until the user calls
543 * dev_put to indicate they have finished with it.
546 struct net_device
*dev_get_by_index(int ifindex
)
548 struct net_device
*dev
;
550 read_lock(&dev_base_lock
);
551 dev
= __dev_get_by_index(ifindex
);
554 read_unlock(&dev_base_lock
);
559 * dev_getbyhwaddr - find a device by its hardware address
560 * @type: media type of device
561 * @ha: hardware address
563 * Search for an interface by MAC address. Returns NULL if the device
564 * is not found or a pointer to the device. The caller must hold the
565 * rtnl semaphore. The returned device has not had its ref count increased
566 * and the caller must therefore be careful about locking
569 * If the API was consistent this would be __dev_get_by_hwaddr
572 struct net_device
*dev_getbyhwaddr(unsigned short type
, char *ha
)
574 struct net_device
*dev
;
578 for (dev
= dev_base
; dev
; dev
= dev
->next
)
579 if (dev
->type
== type
&&
580 !memcmp(dev
->dev_addr
, ha
, dev
->addr_len
))
585 EXPORT_SYMBOL(dev_getbyhwaddr
);
587 struct net_device
*dev_getfirstbyhwtype(unsigned short type
)
589 struct net_device
*dev
;
592 for (dev
= dev_base
; dev
; dev
= dev
->next
) {
593 if (dev
->type
== type
) {
602 EXPORT_SYMBOL(dev_getfirstbyhwtype
);
605 * dev_get_by_flags - find any device with given flags
606 * @if_flags: IFF_* values
607 * @mask: bitmask of bits in if_flags to check
609 * Search for any interface with the given flags. Returns NULL if a device
610 * is not found or a pointer to the device. The device returned has
611 * had a reference added and the pointer is safe until the user calls
612 * dev_put to indicate they have finished with it.
615 struct net_device
* dev_get_by_flags(unsigned short if_flags
, unsigned short mask
)
617 struct net_device
*dev
;
619 read_lock(&dev_base_lock
);
620 for (dev
= dev_base
; dev
!= NULL
; dev
= dev
->next
) {
621 if (((dev
->flags
^ if_flags
) & mask
) == 0) {
626 read_unlock(&dev_base_lock
);
631 * dev_valid_name - check if name is okay for network device
634 * Network device names need to be valid file names to
635 * to allow sysfs to work
637 int dev_valid_name(const char *name
)
639 return !(*name
== '\0'
640 || !strcmp(name
, ".")
641 || !strcmp(name
, "..")
642 || strchr(name
, '/'));
646 * dev_alloc_name - allocate a name for a device
648 * @name: name format string
650 * Passed a format string - eg "lt%d" it will try and find a suitable
651 * id. It scans list of devices to build up a free map, then chooses
652 * the first empty slot. The caller must hold the dev_base or rtnl lock
653 * while allocating the name and adding the device in order to avoid
655 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
656 * Returns the number of the unit assigned or a negative errno code.
659 int dev_alloc_name(struct net_device
*dev
, const char *name
)
664 const int max_netdevices
= 8*PAGE_SIZE
;
666 struct net_device
*d
;
668 p
= strnchr(name
, IFNAMSIZ
-1, '%');
671 * Verify the string as this thing may have come from
672 * the user. There must be either one "%d" and no other "%"
675 if (p
[1] != 'd' || strchr(p
+ 2, '%'))
678 /* Use one page as a bit array of possible slots */
679 inuse
= (long *) get_zeroed_page(GFP_ATOMIC
);
683 for (d
= dev_base
; d
; d
= d
->next
) {
684 if (!sscanf(d
->name
, name
, &i
))
686 if (i
< 0 || i
>= max_netdevices
)
689 /* avoid cases where sscanf is not exact inverse of printf */
690 snprintf(buf
, sizeof(buf
), name
, i
);
691 if (!strncmp(buf
, d
->name
, IFNAMSIZ
))
695 i
= find_first_zero_bit(inuse
, max_netdevices
);
696 free_page((unsigned long) inuse
);
699 snprintf(buf
, sizeof(buf
), name
, i
);
700 if (!__dev_get_by_name(buf
)) {
701 strlcpy(dev
->name
, buf
, IFNAMSIZ
);
705 /* It is possible to run out of possible slots
706 * when the name is long and there isn't enough space left
707 * for the digits, or if all bits are used.
714 * dev_change_name - change name of a device
716 * @newname: name (or format string) must be at least IFNAMSIZ
718 * Change name of a device, can pass format strings "eth%d".
721 int dev_change_name(struct net_device
*dev
, char *newname
)
727 if (dev
->flags
& IFF_UP
)
730 if (!dev_valid_name(newname
))
733 if (strchr(newname
, '%')) {
734 err
= dev_alloc_name(dev
, newname
);
737 strcpy(newname
, dev
->name
);
739 else if (__dev_get_by_name(newname
))
742 strlcpy(dev
->name
, newname
, IFNAMSIZ
);
744 err
= class_device_rename(&dev
->class_dev
, dev
->name
);
746 hlist_del(&dev
->name_hlist
);
747 hlist_add_head(&dev
->name_hlist
, dev_name_hash(dev
->name
));
748 raw_notifier_call_chain(&netdev_chain
,
749 NETDEV_CHANGENAME
, dev
);
756 * netdev_features_change - device changes features
757 * @dev: device to cause notification
759 * Called to indicate a device has changed features.
761 void netdev_features_change(struct net_device
*dev
)
763 raw_notifier_call_chain(&netdev_chain
, NETDEV_FEAT_CHANGE
, dev
);
765 EXPORT_SYMBOL(netdev_features_change
);
768 * netdev_state_change - device changes state
769 * @dev: device to cause notification
771 * Called to indicate a device has changed state. This function calls
772 * the notifier chains for netdev_chain and sends a NEWLINK message
773 * to the routing socket.
775 void netdev_state_change(struct net_device
*dev
)
777 if (dev
->flags
& IFF_UP
) {
778 raw_notifier_call_chain(&netdev_chain
,
780 rtmsg_ifinfo(RTM_NEWLINK
, dev
, 0);
785 * dev_load - load a network module
786 * @name: name of interface
788 * If a network interface is not present and the process has suitable
789 * privileges this function loads the module. If module loading is not
790 * available in this kernel then it becomes a nop.
793 void dev_load(const char *name
)
795 struct net_device
*dev
;
797 read_lock(&dev_base_lock
);
798 dev
= __dev_get_by_name(name
);
799 read_unlock(&dev_base_lock
);
801 if (!dev
&& capable(CAP_SYS_MODULE
))
802 request_module("%s", name
);
805 static int default_rebuild_header(struct sk_buff
*skb
)
807 printk(KERN_DEBUG
"%s: default_rebuild_header called -- BUG!\n",
808 skb
->dev
? skb
->dev
->name
: "NULL!!!");
815 * dev_open - prepare an interface for use.
816 * @dev: device to open
818 * Takes a device from down to up state. The device's private open
819 * function is invoked and then the multicast lists are loaded. Finally
820 * the device is moved into the up state and a %NETDEV_UP message is
821 * sent to the netdev notifier chain.
823 * Calling this function on an active interface is a nop. On a failure
824 * a negative errno code is returned.
826 int dev_open(struct net_device
*dev
)
834 if (dev
->flags
& IFF_UP
)
838 * Is it even present?
840 if (!netif_device_present(dev
))
844 * Call device private open method
846 set_bit(__LINK_STATE_START
, &dev
->state
);
848 ret
= dev
->open(dev
);
850 clear_bit(__LINK_STATE_START
, &dev
->state
);
854 * If it went open OK then:
861 dev
->flags
|= IFF_UP
;
864 * Initialize multicasting status
869 * Wakeup transmit queue engine
874 * ... and announce new interface.
876 raw_notifier_call_chain(&netdev_chain
, NETDEV_UP
, dev
);
882 * dev_close - shutdown an interface.
883 * @dev: device to shutdown
885 * This function moves an active device into down state. A
886 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
887 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
890 int dev_close(struct net_device
*dev
)
892 if (!(dev
->flags
& IFF_UP
))
896 * Tell people we are going down, so that they can
897 * prepare to death, when device is still operating.
899 raw_notifier_call_chain(&netdev_chain
, NETDEV_GOING_DOWN
, dev
);
903 clear_bit(__LINK_STATE_START
, &dev
->state
);
905 /* Synchronize to scheduled poll. We cannot touch poll list,
906 * it can be even on different cpu. So just clear netif_running(),
907 * and wait when poll really will happen. Actually, the best place
908 * for this is inside dev->stop() after device stopped its irq
909 * engine, but this requires more changes in devices. */
911 smp_mb__after_clear_bit(); /* Commit netif_running(). */
912 while (test_bit(__LINK_STATE_RX_SCHED
, &dev
->state
)) {
918 * Call the device specific close. This cannot fail.
919 * Only if device is UP
921 * We allow it to be called even after a DETACH hot-plug
928 * Device is now down.
931 dev
->flags
&= ~IFF_UP
;
934 * Tell people we are down
936 raw_notifier_call_chain(&netdev_chain
, NETDEV_DOWN
, dev
);
943 * Device change register/unregister. These are not inline or static
944 * as we export them to the world.
948 * register_netdevice_notifier - register a network notifier block
951 * Register a notifier to be called when network device events occur.
952 * The notifier passed is linked into the kernel structures and must
953 * not be reused until it has been unregistered. A negative errno code
954 * is returned on a failure.
956 * When registered all registration and up events are replayed
957 * to the new notifier to allow device to have a race free
958 * view of the network device list.
961 int register_netdevice_notifier(struct notifier_block
*nb
)
963 struct net_device
*dev
;
967 err
= raw_notifier_chain_register(&netdev_chain
, nb
);
969 for (dev
= dev_base
; dev
; dev
= dev
->next
) {
970 nb
->notifier_call(nb
, NETDEV_REGISTER
, dev
);
972 if (dev
->flags
& IFF_UP
)
973 nb
->notifier_call(nb
, NETDEV_UP
, dev
);
981 * unregister_netdevice_notifier - unregister a network notifier block
984 * Unregister a notifier previously registered by
985 * register_netdevice_notifier(). The notifier is unlinked into the
986 * kernel structures and may then be reused. A negative errno code
987 * is returned on a failure.
990 int unregister_netdevice_notifier(struct notifier_block
*nb
)
995 err
= raw_notifier_chain_unregister(&netdev_chain
, nb
);
1001 * call_netdevice_notifiers - call all network notifier blocks
1002 * @val: value passed unmodified to notifier function
1003 * @v: pointer passed unmodified to notifier function
1005 * Call all network notifier blocks. Parameters and return value
1006 * are as for raw_notifier_call_chain().
1009 int call_netdevice_notifiers(unsigned long val
, void *v
)
1011 return raw_notifier_call_chain(&netdev_chain
, val
, v
);
1014 /* When > 0 there are consumers of rx skb time stamps */
1015 static atomic_t netstamp_needed
= ATOMIC_INIT(0);
1017 void net_enable_timestamp(void)
1019 atomic_inc(&netstamp_needed
);
1022 void net_disable_timestamp(void)
1024 atomic_dec(&netstamp_needed
);
1027 void __net_timestamp(struct sk_buff
*skb
)
1031 do_gettimeofday(&tv
);
1032 skb_set_timestamp(skb
, &tv
);
1034 EXPORT_SYMBOL(__net_timestamp
);
1036 static inline void net_timestamp(struct sk_buff
*skb
)
1038 if (atomic_read(&netstamp_needed
))
1039 __net_timestamp(skb
);
1041 skb
->tstamp
.off_sec
= 0;
1042 skb
->tstamp
.off_usec
= 0;
1047 * Support routine. Sends outgoing frames to any network
1048 * taps currently in use.
1051 void dev_queue_xmit_nit(struct sk_buff
*skb
, struct net_device
*dev
)
1053 struct packet_type
*ptype
;
1058 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1059 /* Never send packets back to the socket
1060 * they originated from - MvS (miquels@drinkel.ow.org)
1062 if ((ptype
->dev
== dev
|| !ptype
->dev
) &&
1063 (ptype
->af_packet_priv
== NULL
||
1064 (struct sock
*)ptype
->af_packet_priv
!= skb
->sk
)) {
1065 struct sk_buff
*skb2
= skb_clone(skb
, GFP_ATOMIC
);
1069 /* skb->nh should be correctly
1070 set by sender, so that the second statement is
1071 just protection against buggy protocols.
1073 skb2
->mac
.raw
= skb2
->data
;
1075 if (skb2
->nh
.raw
< skb2
->data
||
1076 skb2
->nh
.raw
> skb2
->tail
) {
1077 if (net_ratelimit())
1078 printk(KERN_CRIT
"protocol %04x is "
1080 skb2
->protocol
, dev
->name
);
1081 skb2
->nh
.raw
= skb2
->data
;
1084 skb2
->h
.raw
= skb2
->nh
.raw
;
1085 skb2
->pkt_type
= PACKET_OUTGOING
;
1086 ptype
->func(skb2
, skb
->dev
, ptype
, skb
->dev
);
1093 void __netif_schedule(struct net_device
*dev
)
1095 if (!test_and_set_bit(__LINK_STATE_SCHED
, &dev
->state
)) {
1096 unsigned long flags
;
1097 struct softnet_data
*sd
;
1099 local_irq_save(flags
);
1100 sd
= &__get_cpu_var(softnet_data
);
1101 dev
->next_sched
= sd
->output_queue
;
1102 sd
->output_queue
= dev
;
1103 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
1104 local_irq_restore(flags
);
1107 EXPORT_SYMBOL(__netif_schedule
);
1109 void __netif_rx_schedule(struct net_device
*dev
)
1111 unsigned long flags
;
1113 local_irq_save(flags
);
1115 list_add_tail(&dev
->poll_list
, &__get_cpu_var(softnet_data
).poll_list
);
1117 dev
->quota
+= dev
->weight
;
1119 dev
->quota
= dev
->weight
;
1120 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
1121 local_irq_restore(flags
);
1123 EXPORT_SYMBOL(__netif_rx_schedule
);
1125 void dev_kfree_skb_any(struct sk_buff
*skb
)
1127 if (in_irq() || irqs_disabled())
1128 dev_kfree_skb_irq(skb
);
1132 EXPORT_SYMBOL(dev_kfree_skb_any
);
1136 void netif_device_detach(struct net_device
*dev
)
1138 if (test_and_clear_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1139 netif_running(dev
)) {
1140 netif_stop_queue(dev
);
1143 EXPORT_SYMBOL(netif_device_detach
);
1145 void netif_device_attach(struct net_device
*dev
)
1147 if (!test_and_set_bit(__LINK_STATE_PRESENT
, &dev
->state
) &&
1148 netif_running(dev
)) {
1149 netif_wake_queue(dev
);
1150 __netdev_watchdog_up(dev
);
1153 EXPORT_SYMBOL(netif_device_attach
);
1157 * Invalidate hardware checksum when packet is to be mangled, and
1158 * complete checksum manually on outgoing path.
1160 int skb_checksum_help(struct sk_buff
*skb
, int inward
)
1163 int ret
= 0, offset
= skb
->h
.raw
- skb
->data
;
1166 skb
->ip_summed
= CHECKSUM_NONE
;
1170 if (skb_cloned(skb
)) {
1171 ret
= pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
1176 BUG_ON(offset
> (int)skb
->len
);
1177 csum
= skb_checksum(skb
, offset
, skb
->len
-offset
, 0);
1179 offset
= skb
->tail
- skb
->h
.raw
;
1180 BUG_ON(offset
<= 0);
1181 BUG_ON(skb
->csum
+ 2 > offset
);
1183 *(u16
*)(skb
->h
.raw
+ skb
->csum
) = csum_fold(csum
);
1184 skb
->ip_summed
= CHECKSUM_NONE
;
1189 /* Take action when hardware reception checksum errors are detected. */
1191 void netdev_rx_csum_fault(struct net_device
*dev
)
1193 if (net_ratelimit()) {
1194 printk(KERN_ERR
"%s: hw csum failure.\n",
1195 dev
? dev
->name
: "<unknown>");
1199 EXPORT_SYMBOL(netdev_rx_csum_fault
);
1202 #ifdef CONFIG_HIGHMEM
1203 /* Actually, we should eliminate this check as soon as we know, that:
1204 * 1. IOMMU is present and allows to map all the memory.
1205 * 2. No high memory really exists on this machine.
1208 static inline int illegal_highdma(struct net_device
*dev
, struct sk_buff
*skb
)
1212 if (dev
->features
& NETIF_F_HIGHDMA
)
1215 for (i
= 0; i
< skb_shinfo(skb
)->nr_frags
; i
++)
1216 if (PageHighMem(skb_shinfo(skb
)->frags
[i
].page
))
1222 #define illegal_highdma(dev, skb) (0)
1225 /* Keep head the same: replace data */
1226 int __skb_linearize(struct sk_buff
*skb
, gfp_t gfp_mask
)
1231 struct skb_shared_info
*ninfo
;
1232 int headerlen
= skb
->data
- skb
->head
;
1233 int expand
= (skb
->tail
+ skb
->data_len
) - skb
->end
;
1235 if (skb_shared(skb
))
1241 size
= skb
->end
- skb
->head
+ expand
;
1242 size
= SKB_DATA_ALIGN(size
);
1243 data
= kmalloc(size
+ sizeof(struct skb_shared_info
), gfp_mask
);
1247 /* Copy entire thing */
1248 if (skb_copy_bits(skb
, -headerlen
, data
, headerlen
+ skb
->len
))
1252 ninfo
= (struct skb_shared_info
*)(data
+ size
);
1253 atomic_set(&ninfo
->dataref
, 1);
1254 ninfo
->tso_size
= skb_shinfo(skb
)->tso_size
;
1255 ninfo
->tso_segs
= skb_shinfo(skb
)->tso_segs
;
1256 ninfo
->nr_frags
= 0;
1257 ninfo
->frag_list
= NULL
;
1259 /* Offset between the two in bytes */
1260 offset
= data
- skb
->head
;
1262 /* Free old data. */
1263 skb_release_data(skb
);
1266 skb
->end
= data
+ size
;
1268 /* Set up new pointers */
1269 skb
->h
.raw
+= offset
;
1270 skb
->nh
.raw
+= offset
;
1271 skb
->mac
.raw
+= offset
;
1272 skb
->tail
+= offset
;
1273 skb
->data
+= offset
;
1275 /* We are no longer a clone, even if we were. */
1278 skb
->tail
+= skb
->data_len
;
1283 #define HARD_TX_LOCK(dev, cpu) { \
1284 if ((dev->features & NETIF_F_LLTX) == 0) { \
1285 netif_tx_lock(dev); \
1289 #define HARD_TX_UNLOCK(dev) { \
1290 if ((dev->features & NETIF_F_LLTX) == 0) { \
1291 netif_tx_unlock(dev); \
1296 * dev_queue_xmit - transmit a buffer
1297 * @skb: buffer to transmit
1299 * Queue a buffer for transmission to a network device. The caller must
1300 * have set the device and priority and built the buffer before calling
1301 * this function. The function can be called from an interrupt.
1303 * A negative errno code is returned on a failure. A success does not
1304 * guarantee the frame will be transmitted as it may be dropped due
1305 * to congestion or traffic shaping.
1307 * -----------------------------------------------------------------------------------
1308 * I notice this method can also return errors from the queue disciplines,
1309 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1312 * Regardless of the return value, the skb is consumed, so it is currently
1313 * difficult to retry a send to this method. (You can bump the ref count
1314 * before sending to hold a reference for retry if you are careful.)
1316 * When calling this method, interrupts MUST be enabled. This is because
1317 * the BH enable code must have IRQs enabled so that it will not deadlock.
1321 int dev_queue_xmit(struct sk_buff
*skb
)
1323 struct net_device
*dev
= skb
->dev
;
1327 if (skb_shinfo(skb
)->frag_list
&&
1328 !(dev
->features
& NETIF_F_FRAGLIST
) &&
1329 __skb_linearize(skb
, GFP_ATOMIC
))
1332 /* Fragmented skb is linearized if device does not support SG,
1333 * or if at least one of fragments is in highmem and device
1334 * does not support DMA from it.
1336 if (skb_shinfo(skb
)->nr_frags
&&
1337 (!(dev
->features
& NETIF_F_SG
) || illegal_highdma(dev
, skb
)) &&
1338 __skb_linearize(skb
, GFP_ATOMIC
))
1341 /* If packet is not checksummed and device does not support
1342 * checksumming for this protocol, complete checksumming here.
1344 if (skb
->ip_summed
== CHECKSUM_HW
&&
1345 (!(dev
->features
& (NETIF_F_HW_CSUM
| NETIF_F_NO_CSUM
)) &&
1346 (!(dev
->features
& NETIF_F_IP_CSUM
) ||
1347 skb
->protocol
!= htons(ETH_P_IP
))))
1348 if (skb_checksum_help(skb
, 0))
1351 spin_lock_prefetch(&dev
->queue_lock
);
1353 /* Disable soft irqs for various locks below. Also
1354 * stops preemption for RCU.
1358 /* Updates of qdisc are serialized by queue_lock.
1359 * The struct Qdisc which is pointed to by qdisc is now a
1360 * rcu structure - it may be accessed without acquiring
1361 * a lock (but the structure may be stale.) The freeing of the
1362 * qdisc will be deferred until it's known that there are no
1363 * more references to it.
1365 * If the qdisc has an enqueue function, we still need to
1366 * hold the queue_lock before calling it, since queue_lock
1367 * also serializes access to the device queue.
1370 q
= rcu_dereference(dev
->qdisc
);
1371 #ifdef CONFIG_NET_CLS_ACT
1372 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
,AT_EGRESS
);
1375 /* Grab device queue */
1376 spin_lock(&dev
->queue_lock
);
1378 rc
= q
->enqueue(skb
, q
);
1382 spin_unlock(&dev
->queue_lock
);
1383 rc
= rc
== NET_XMIT_BYPASS
? NET_XMIT_SUCCESS
: rc
;
1387 /* The device has no queue. Common case for software devices:
1388 loopback, all the sorts of tunnels...
1390 Really, it is unlikely that netif_tx_lock protection is necessary
1391 here. (f.e. loopback and IP tunnels are clean ignoring statistics
1393 However, it is possible, that they rely on protection
1396 Check this and shot the lock. It is not prone from deadlocks.
1397 Either shot noqueue qdisc, it is even simpler 8)
1399 if (dev
->flags
& IFF_UP
) {
1400 int cpu
= smp_processor_id(); /* ok because BHs are off */
1402 if (dev
->xmit_lock_owner
!= cpu
) {
1404 HARD_TX_LOCK(dev
, cpu
);
1406 if (!netif_queue_stopped(dev
)) {
1408 dev_queue_xmit_nit(skb
, dev
);
1411 if (!dev
->hard_start_xmit(skb
, dev
)) {
1412 HARD_TX_UNLOCK(dev
);
1416 HARD_TX_UNLOCK(dev
);
1417 if (net_ratelimit())
1418 printk(KERN_CRIT
"Virtual device %s asks to "
1419 "queue packet!\n", dev
->name
);
1421 /* Recursion is detected! It is possible,
1423 if (net_ratelimit())
1424 printk(KERN_CRIT
"Dead loop on virtual device "
1425 "%s, fix it urgently!\n", dev
->name
);
1441 /*=======================================================================
1443 =======================================================================*/
1445 int netdev_max_backlog
= 1000;
1446 int netdev_budget
= 300;
1447 int weight_p
= 64; /* old backlog weight */
1449 DEFINE_PER_CPU(struct netif_rx_stats
, netdev_rx_stat
) = { 0, };
1453 * netif_rx - post buffer to the network code
1454 * @skb: buffer to post
1456 * This function receives a packet from a device driver and queues it for
1457 * the upper (protocol) levels to process. It always succeeds. The buffer
1458 * may be dropped during processing for congestion control or by the
1462 * NET_RX_SUCCESS (no congestion)
1463 * NET_RX_CN_LOW (low congestion)
1464 * NET_RX_CN_MOD (moderate congestion)
1465 * NET_RX_CN_HIGH (high congestion)
1466 * NET_RX_DROP (packet was dropped)
1470 int netif_rx(struct sk_buff
*skb
)
1472 struct softnet_data
*queue
;
1473 unsigned long flags
;
1475 /* if netpoll wants it, pretend we never saw it */
1476 if (netpoll_rx(skb
))
1479 if (!skb
->tstamp
.off_sec
)
1483 * The code is rearranged so that the path is the most
1484 * short when CPU is congested, but is still operating.
1486 local_irq_save(flags
);
1487 queue
= &__get_cpu_var(softnet_data
);
1489 __get_cpu_var(netdev_rx_stat
).total
++;
1490 if (queue
->input_pkt_queue
.qlen
<= netdev_max_backlog
) {
1491 if (queue
->input_pkt_queue
.qlen
) {
1494 __skb_queue_tail(&queue
->input_pkt_queue
, skb
);
1495 local_irq_restore(flags
);
1496 return NET_RX_SUCCESS
;
1499 netif_rx_schedule(&queue
->backlog_dev
);
1503 __get_cpu_var(netdev_rx_stat
).dropped
++;
1504 local_irq_restore(flags
);
1510 int netif_rx_ni(struct sk_buff
*skb
)
1515 err
= netif_rx(skb
);
1516 if (local_softirq_pending())
1523 EXPORT_SYMBOL(netif_rx_ni
);
1525 static inline struct net_device
*skb_bond(struct sk_buff
*skb
)
1527 struct net_device
*dev
= skb
->dev
;
1531 * On bonding slaves other than the currently active
1532 * slave, suppress duplicates except for 802.3ad
1533 * ETH_P_SLOW and alb non-mcast/bcast.
1535 if (dev
->priv_flags
& IFF_SLAVE_INACTIVE
) {
1536 if (dev
->master
->priv_flags
& IFF_MASTER_ALB
) {
1537 if (skb
->pkt_type
!= PACKET_BROADCAST
&&
1538 skb
->pkt_type
!= PACKET_MULTICAST
)
1542 if (dev
->master
->priv_flags
& IFF_MASTER_8023AD
&&
1543 skb
->protocol
== __constant_htons(ETH_P_SLOW
))
1550 skb
->dev
= dev
->master
;
1556 static void net_tx_action(struct softirq_action
*h
)
1558 struct softnet_data
*sd
= &__get_cpu_var(softnet_data
);
1560 if (sd
->completion_queue
) {
1561 struct sk_buff
*clist
;
1563 local_irq_disable();
1564 clist
= sd
->completion_queue
;
1565 sd
->completion_queue
= NULL
;
1569 struct sk_buff
*skb
= clist
;
1570 clist
= clist
->next
;
1572 BUG_TRAP(!atomic_read(&skb
->users
));
1577 if (sd
->output_queue
) {
1578 struct net_device
*head
;
1580 local_irq_disable();
1581 head
= sd
->output_queue
;
1582 sd
->output_queue
= NULL
;
1586 struct net_device
*dev
= head
;
1587 head
= head
->next_sched
;
1589 smp_mb__before_clear_bit();
1590 clear_bit(__LINK_STATE_SCHED
, &dev
->state
);
1592 if (spin_trylock(&dev
->queue_lock
)) {
1594 spin_unlock(&dev
->queue_lock
);
1596 netif_schedule(dev
);
1602 static __inline__
int deliver_skb(struct sk_buff
*skb
,
1603 struct packet_type
*pt_prev
,
1604 struct net_device
*orig_dev
)
1606 atomic_inc(&skb
->users
);
1607 return pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1610 #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1611 int (*br_handle_frame_hook
)(struct net_bridge_port
*p
, struct sk_buff
**pskb
);
1613 struct net_bridge_fdb_entry
*(*br_fdb_get_hook
)(struct net_bridge
*br
,
1614 unsigned char *addr
);
1615 void (*br_fdb_put_hook
)(struct net_bridge_fdb_entry
*ent
);
1617 static __inline__
int handle_bridge(struct sk_buff
**pskb
,
1618 struct packet_type
**pt_prev
, int *ret
,
1619 struct net_device
*orig_dev
)
1621 struct net_bridge_port
*port
;
1623 if ((*pskb
)->pkt_type
== PACKET_LOOPBACK
||
1624 (port
= rcu_dereference((*pskb
)->dev
->br_port
)) == NULL
)
1628 *ret
= deliver_skb(*pskb
, *pt_prev
, orig_dev
);
1632 return br_handle_frame_hook(port
, pskb
);
1635 #define handle_bridge(skb, pt_prev, ret, orig_dev) (0)
1638 #ifdef CONFIG_NET_CLS_ACT
1639 /* TODO: Maybe we should just force sch_ingress to be compiled in
1640 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
1641 * a compare and 2 stores extra right now if we dont have it on
1642 * but have CONFIG_NET_CLS_ACT
1643 * NOTE: This doesnt stop any functionality; if you dont have
1644 * the ingress scheduler, you just cant add policies on ingress.
1647 static int ing_filter(struct sk_buff
*skb
)
1650 struct net_device
*dev
= skb
->dev
;
1651 int result
= TC_ACT_OK
;
1653 if (dev
->qdisc_ingress
) {
1654 __u32 ttl
= (__u32
) G_TC_RTTL(skb
->tc_verd
);
1655 if (MAX_RED_LOOP
< ttl
++) {
1656 printk("Redir loop detected Dropping packet (%s->%s)\n",
1657 skb
->input_dev
->name
, skb
->dev
->name
);
1661 skb
->tc_verd
= SET_TC_RTTL(skb
->tc_verd
,ttl
);
1663 skb
->tc_verd
= SET_TC_AT(skb
->tc_verd
,AT_INGRESS
);
1665 spin_lock(&dev
->ingress_lock
);
1666 if ((q
= dev
->qdisc_ingress
) != NULL
)
1667 result
= q
->enqueue(skb
, q
);
1668 spin_unlock(&dev
->ingress_lock
);
1676 int netif_receive_skb(struct sk_buff
*skb
)
1678 struct packet_type
*ptype
, *pt_prev
;
1679 struct net_device
*orig_dev
;
1680 int ret
= NET_RX_DROP
;
1681 unsigned short type
;
1683 /* if we've gotten here through NAPI, check netpoll */
1684 if (skb
->dev
->poll
&& netpoll_rx(skb
))
1687 if (!skb
->tstamp
.off_sec
)
1690 if (!skb
->input_dev
)
1691 skb
->input_dev
= skb
->dev
;
1693 orig_dev
= skb_bond(skb
);
1698 __get_cpu_var(netdev_rx_stat
).total
++;
1700 skb
->h
.raw
= skb
->nh
.raw
= skb
->data
;
1701 skb
->mac_len
= skb
->nh
.raw
- skb
->mac
.raw
;
1707 #ifdef CONFIG_NET_CLS_ACT
1708 if (skb
->tc_verd
& TC_NCLS
) {
1709 skb
->tc_verd
= CLR_TC_NCLS(skb
->tc_verd
);
1714 list_for_each_entry_rcu(ptype
, &ptype_all
, list
) {
1715 if (!ptype
->dev
|| ptype
->dev
== skb
->dev
) {
1717 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
1722 #ifdef CONFIG_NET_CLS_ACT
1724 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
1725 pt_prev
= NULL
; /* noone else should process this after*/
1727 skb
->tc_verd
= SET_TC_OK2MUNGE(skb
->tc_verd
);
1730 ret
= ing_filter(skb
);
1732 if (ret
== TC_ACT_SHOT
|| (ret
== TC_ACT_STOLEN
)) {
1741 handle_diverter(skb
);
1743 if (handle_bridge(&skb
, &pt_prev
, &ret
, orig_dev
))
1746 type
= skb
->protocol
;
1747 list_for_each_entry_rcu(ptype
, &ptype_base
[ntohs(type
)&15], list
) {
1748 if (ptype
->type
== type
&&
1749 (!ptype
->dev
|| ptype
->dev
== skb
->dev
)) {
1751 ret
= deliver_skb(skb
, pt_prev
, orig_dev
);
1757 ret
= pt_prev
->func(skb
, skb
->dev
, pt_prev
, orig_dev
);
1760 /* Jamal, now you will not able to escape explaining
1761 * me how you were going to use this. :-)
1771 static int process_backlog(struct net_device
*backlog_dev
, int *budget
)
1774 int quota
= min(backlog_dev
->quota
, *budget
);
1775 struct softnet_data
*queue
= &__get_cpu_var(softnet_data
);
1776 unsigned long start_time
= jiffies
;
1778 backlog_dev
->weight
= weight_p
;
1780 struct sk_buff
*skb
;
1781 struct net_device
*dev
;
1783 local_irq_disable();
1784 skb
= __skb_dequeue(&queue
->input_pkt_queue
);
1791 netif_receive_skb(skb
);
1797 if (work
>= quota
|| jiffies
- start_time
> 1)
1802 backlog_dev
->quota
-= work
;
1807 backlog_dev
->quota
-= work
;
1810 list_del(&backlog_dev
->poll_list
);
1811 smp_mb__before_clear_bit();
1812 netif_poll_enable(backlog_dev
);
1818 static void net_rx_action(struct softirq_action
*h
)
1820 struct softnet_data
*queue
= &__get_cpu_var(softnet_data
);
1821 unsigned long start_time
= jiffies
;
1822 int budget
= netdev_budget
;
1825 local_irq_disable();
1827 while (!list_empty(&queue
->poll_list
)) {
1828 struct net_device
*dev
;
1830 if (budget
<= 0 || jiffies
- start_time
> 1)
1835 dev
= list_entry(queue
->poll_list
.next
,
1836 struct net_device
, poll_list
);
1837 have
= netpoll_poll_lock(dev
);
1839 if (dev
->quota
<= 0 || dev
->poll(dev
, &budget
)) {
1840 netpoll_poll_unlock(have
);
1841 local_irq_disable();
1842 list_move_tail(&dev
->poll_list
, &queue
->poll_list
);
1844 dev
->quota
+= dev
->weight
;
1846 dev
->quota
= dev
->weight
;
1848 netpoll_poll_unlock(have
);
1850 local_irq_disable();
1854 #ifdef CONFIG_NET_DMA
1856 * There may not be any more sk_buffs coming right now, so push
1857 * any pending DMA copies to hardware
1859 if (net_dma_client
) {
1860 struct dma_chan
*chan
;
1862 list_for_each_entry_rcu(chan
, &net_dma_client
->channels
, client_node
)
1863 dma_async_memcpy_issue_pending(chan
);
1871 __get_cpu_var(netdev_rx_stat
).time_squeeze
++;
1872 __raise_softirq_irqoff(NET_RX_SOFTIRQ
);
1876 static gifconf_func_t
* gifconf_list
[NPROTO
];
1879 * register_gifconf - register a SIOCGIF handler
1880 * @family: Address family
1881 * @gifconf: Function handler
1883 * Register protocol dependent address dumping routines. The handler
1884 * that is passed must not be freed or reused until it has been replaced
1885 * by another handler.
1887 int register_gifconf(unsigned int family
, gifconf_func_t
* gifconf
)
1889 if (family
>= NPROTO
)
1891 gifconf_list
[family
] = gifconf
;
1897 * Map an interface index to its name (SIOCGIFNAME)
1901 * We need this ioctl for efficient implementation of the
1902 * if_indextoname() function required by the IPv6 API. Without
1903 * it, we would have to search all the interfaces to find a
1907 static int dev_ifname(struct ifreq __user
*arg
)
1909 struct net_device
*dev
;
1913 * Fetch the caller's info block.
1916 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
1919 read_lock(&dev_base_lock
);
1920 dev
= __dev_get_by_index(ifr
.ifr_ifindex
);
1922 read_unlock(&dev_base_lock
);
1926 strcpy(ifr
.ifr_name
, dev
->name
);
1927 read_unlock(&dev_base_lock
);
1929 if (copy_to_user(arg
, &ifr
, sizeof(struct ifreq
)))
1935 * Perform a SIOCGIFCONF call. This structure will change
1936 * size eventually, and there is nothing I can do about it.
1937 * Thus we will need a 'compatibility mode'.
1940 static int dev_ifconf(char __user
*arg
)
1943 struct net_device
*dev
;
1950 * Fetch the caller's info block.
1953 if (copy_from_user(&ifc
, arg
, sizeof(struct ifconf
)))
1960 * Loop over the interfaces, and write an info block for each.
1964 for (dev
= dev_base
; dev
; dev
= dev
->next
) {
1965 for (i
= 0; i
< NPROTO
; i
++) {
1966 if (gifconf_list
[i
]) {
1969 done
= gifconf_list
[i
](dev
, NULL
, 0);
1971 done
= gifconf_list
[i
](dev
, pos
+ total
,
1981 * All done. Write the updated control block back to the caller.
1983 ifc
.ifc_len
= total
;
1986 * Both BSD and Solaris return 0 here, so we do too.
1988 return copy_to_user(arg
, &ifc
, sizeof(struct ifconf
)) ? -EFAULT
: 0;
1991 #ifdef CONFIG_PROC_FS
1993 * This is invoked by the /proc filesystem handler to display a device
1996 static __inline__
struct net_device
*dev_get_idx(loff_t pos
)
1998 struct net_device
*dev
;
2001 for (i
= 0, dev
= dev_base
; dev
&& i
< pos
; ++i
, dev
= dev
->next
);
2003 return i
== pos
? dev
: NULL
;
2006 void *dev_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2008 read_lock(&dev_base_lock
);
2009 return *pos
? dev_get_idx(*pos
- 1) : SEQ_START_TOKEN
;
2012 void *dev_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2015 return v
== SEQ_START_TOKEN
? dev_base
: ((struct net_device
*)v
)->next
;
2018 void dev_seq_stop(struct seq_file
*seq
, void *v
)
2020 read_unlock(&dev_base_lock
);
2023 static void dev_seq_printf_stats(struct seq_file
*seq
, struct net_device
*dev
)
2025 if (dev
->get_stats
) {
2026 struct net_device_stats
*stats
= dev
->get_stats(dev
);
2028 seq_printf(seq
, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2029 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2030 dev
->name
, stats
->rx_bytes
, stats
->rx_packets
,
2032 stats
->rx_dropped
+ stats
->rx_missed_errors
,
2033 stats
->rx_fifo_errors
,
2034 stats
->rx_length_errors
+ stats
->rx_over_errors
+
2035 stats
->rx_crc_errors
+ stats
->rx_frame_errors
,
2036 stats
->rx_compressed
, stats
->multicast
,
2037 stats
->tx_bytes
, stats
->tx_packets
,
2038 stats
->tx_errors
, stats
->tx_dropped
,
2039 stats
->tx_fifo_errors
, stats
->collisions
,
2040 stats
->tx_carrier_errors
+
2041 stats
->tx_aborted_errors
+
2042 stats
->tx_window_errors
+
2043 stats
->tx_heartbeat_errors
,
2044 stats
->tx_compressed
);
2046 seq_printf(seq
, "%6s: No statistics available.\n", dev
->name
);
2050 * Called from the PROCfs module. This now uses the new arbitrary sized
2051 * /proc/net interface to create /proc/net/dev
2053 static int dev_seq_show(struct seq_file
*seq
, void *v
)
2055 if (v
== SEQ_START_TOKEN
)
2056 seq_puts(seq
, "Inter-| Receive "
2058 " face |bytes packets errs drop fifo frame "
2059 "compressed multicast|bytes packets errs "
2060 "drop fifo colls carrier compressed\n");
2062 dev_seq_printf_stats(seq
, v
);
2066 static struct netif_rx_stats
*softnet_get_online(loff_t
*pos
)
2068 struct netif_rx_stats
*rc
= NULL
;
2070 while (*pos
< NR_CPUS
)
2071 if (cpu_online(*pos
)) {
2072 rc
= &per_cpu(netdev_rx_stat
, *pos
);
2079 static void *softnet_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2081 return softnet_get_online(pos
);
2084 static void *softnet_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2087 return softnet_get_online(pos
);
2090 static void softnet_seq_stop(struct seq_file
*seq
, void *v
)
2094 static int softnet_seq_show(struct seq_file
*seq
, void *v
)
2096 struct netif_rx_stats
*s
= v
;
2098 seq_printf(seq
, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
2099 s
->total
, s
->dropped
, s
->time_squeeze
, 0,
2100 0, 0, 0, 0, /* was fastroute */
2105 static struct seq_operations dev_seq_ops
= {
2106 .start
= dev_seq_start
,
2107 .next
= dev_seq_next
,
2108 .stop
= dev_seq_stop
,
2109 .show
= dev_seq_show
,
2112 static int dev_seq_open(struct inode
*inode
, struct file
*file
)
2114 return seq_open(file
, &dev_seq_ops
);
2117 static struct file_operations dev_seq_fops
= {
2118 .owner
= THIS_MODULE
,
2119 .open
= dev_seq_open
,
2121 .llseek
= seq_lseek
,
2122 .release
= seq_release
,
2125 static struct seq_operations softnet_seq_ops
= {
2126 .start
= softnet_seq_start
,
2127 .next
= softnet_seq_next
,
2128 .stop
= softnet_seq_stop
,
2129 .show
= softnet_seq_show
,
2132 static int softnet_seq_open(struct inode
*inode
, struct file
*file
)
2134 return seq_open(file
, &softnet_seq_ops
);
2137 static struct file_operations softnet_seq_fops
= {
2138 .owner
= THIS_MODULE
,
2139 .open
= softnet_seq_open
,
2141 .llseek
= seq_lseek
,
2142 .release
= seq_release
,
2145 #ifdef CONFIG_WIRELESS_EXT
2146 extern int wireless_proc_init(void);
2148 #define wireless_proc_init() 0
2151 static int __init
dev_proc_init(void)
2155 if (!proc_net_fops_create("dev", S_IRUGO
, &dev_seq_fops
))
2157 if (!proc_net_fops_create("softnet_stat", S_IRUGO
, &softnet_seq_fops
))
2159 if (wireless_proc_init())
2165 proc_net_remove("softnet_stat");
2167 proc_net_remove("dev");
2171 #define dev_proc_init() 0
2172 #endif /* CONFIG_PROC_FS */
2176 * netdev_set_master - set up master/slave pair
2177 * @slave: slave device
2178 * @master: new master device
2180 * Changes the master device of the slave. Pass %NULL to break the
2181 * bonding. The caller must hold the RTNL semaphore. On a failure
2182 * a negative errno code is returned. On success the reference counts
2183 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2184 * function returns zero.
2186 int netdev_set_master(struct net_device
*slave
, struct net_device
*master
)
2188 struct net_device
*old
= slave
->master
;
2198 slave
->master
= master
;
2206 slave
->flags
|= IFF_SLAVE
;
2208 slave
->flags
&= ~IFF_SLAVE
;
2210 rtmsg_ifinfo(RTM_NEWLINK
, slave
, IFF_SLAVE
);
2215 * dev_set_promiscuity - update promiscuity count on a device
2219 * Add or remove promiscuity from a device. While the count in the device
2220 * remains above zero the interface remains promiscuous. Once it hits zero
2221 * the device reverts back to normal filtering operation. A negative inc
2222 * value is used to drop promiscuity on the device.
2224 void dev_set_promiscuity(struct net_device
*dev
, int inc
)
2226 unsigned short old_flags
= dev
->flags
;
2228 if ((dev
->promiscuity
+= inc
) == 0)
2229 dev
->flags
&= ~IFF_PROMISC
;
2231 dev
->flags
|= IFF_PROMISC
;
2232 if (dev
->flags
!= old_flags
) {
2234 printk(KERN_INFO
"device %s %s promiscuous mode\n",
2235 dev
->name
, (dev
->flags
& IFF_PROMISC
) ? "entered" :
2237 audit_log(current
->audit_context
, GFP_ATOMIC
,
2238 AUDIT_ANOM_PROMISCUOUS
,
2239 "dev=%s prom=%d old_prom=%d auid=%u",
2240 dev
->name
, (dev
->flags
& IFF_PROMISC
),
2241 (old_flags
& IFF_PROMISC
),
2242 audit_get_loginuid(current
->audit_context
));
2247 * dev_set_allmulti - update allmulti count on a device
2251 * Add or remove reception of all multicast frames to a device. While the
2252 * count in the device remains above zero the interface remains listening
2253 * to all interfaces. Once it hits zero the device reverts back to normal
2254 * filtering operation. A negative @inc value is used to drop the counter
2255 * when releasing a resource needing all multicasts.
2258 void dev_set_allmulti(struct net_device
*dev
, int inc
)
2260 unsigned short old_flags
= dev
->flags
;
2262 dev
->flags
|= IFF_ALLMULTI
;
2263 if ((dev
->allmulti
+= inc
) == 0)
2264 dev
->flags
&= ~IFF_ALLMULTI
;
2265 if (dev
->flags
^ old_flags
)
2269 unsigned dev_get_flags(const struct net_device
*dev
)
2273 flags
= (dev
->flags
& ~(IFF_PROMISC
|
2278 (dev
->gflags
& (IFF_PROMISC
|
2281 if (netif_running(dev
)) {
2282 if (netif_oper_up(dev
))
2283 flags
|= IFF_RUNNING
;
2284 if (netif_carrier_ok(dev
))
2285 flags
|= IFF_LOWER_UP
;
2286 if (netif_dormant(dev
))
2287 flags
|= IFF_DORMANT
;
2293 int dev_change_flags(struct net_device
*dev
, unsigned flags
)
2296 int old_flags
= dev
->flags
;
2299 * Set the flags on our device.
2302 dev
->flags
= (flags
& (IFF_DEBUG
| IFF_NOTRAILERS
| IFF_NOARP
|
2303 IFF_DYNAMIC
| IFF_MULTICAST
| IFF_PORTSEL
|
2305 (dev
->flags
& (IFF_UP
| IFF_VOLATILE
| IFF_PROMISC
|
2309 * Load in the correct multicast list now the flags have changed.
2315 * Have we downed the interface. We handle IFF_UP ourselves
2316 * according to user attempts to set it, rather than blindly
2321 if ((old_flags
^ flags
) & IFF_UP
) { /* Bit is different ? */
2322 ret
= ((old_flags
& IFF_UP
) ? dev_close
: dev_open
)(dev
);
2328 if (dev
->flags
& IFF_UP
&&
2329 ((old_flags
^ dev
->flags
) &~ (IFF_UP
| IFF_PROMISC
| IFF_ALLMULTI
|
2331 raw_notifier_call_chain(&netdev_chain
,
2332 NETDEV_CHANGE
, dev
);
2334 if ((flags
^ dev
->gflags
) & IFF_PROMISC
) {
2335 int inc
= (flags
& IFF_PROMISC
) ? +1 : -1;
2336 dev
->gflags
^= IFF_PROMISC
;
2337 dev_set_promiscuity(dev
, inc
);
2340 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
2341 is important. Some (broken) drivers set IFF_PROMISC, when
2342 IFF_ALLMULTI is requested not asking us and not reporting.
2344 if ((flags
^ dev
->gflags
) & IFF_ALLMULTI
) {
2345 int inc
= (flags
& IFF_ALLMULTI
) ? +1 : -1;
2346 dev
->gflags
^= IFF_ALLMULTI
;
2347 dev_set_allmulti(dev
, inc
);
2350 if (old_flags
^ dev
->flags
)
2351 rtmsg_ifinfo(RTM_NEWLINK
, dev
, old_flags
^ dev
->flags
);
2356 int dev_set_mtu(struct net_device
*dev
, int new_mtu
)
2360 if (new_mtu
== dev
->mtu
)
2363 /* MTU must be positive. */
2367 if (!netif_device_present(dev
))
2371 if (dev
->change_mtu
)
2372 err
= dev
->change_mtu(dev
, new_mtu
);
2375 if (!err
&& dev
->flags
& IFF_UP
)
2376 raw_notifier_call_chain(&netdev_chain
,
2377 NETDEV_CHANGEMTU
, dev
);
2381 int dev_set_mac_address(struct net_device
*dev
, struct sockaddr
*sa
)
2385 if (!dev
->set_mac_address
)
2387 if (sa
->sa_family
!= dev
->type
)
2389 if (!netif_device_present(dev
))
2391 err
= dev
->set_mac_address(dev
, sa
);
2393 raw_notifier_call_chain(&netdev_chain
,
2394 NETDEV_CHANGEADDR
, dev
);
2399 * Perform the SIOCxIFxxx calls.
2401 static int dev_ifsioc(struct ifreq
*ifr
, unsigned int cmd
)
2404 struct net_device
*dev
= __dev_get_by_name(ifr
->ifr_name
);
2410 case SIOCGIFFLAGS
: /* Get interface flags */
2411 ifr
->ifr_flags
= dev_get_flags(dev
);
2414 case SIOCSIFFLAGS
: /* Set interface flags */
2415 return dev_change_flags(dev
, ifr
->ifr_flags
);
2417 case SIOCGIFMETRIC
: /* Get the metric on the interface
2418 (currently unused) */
2419 ifr
->ifr_metric
= 0;
2422 case SIOCSIFMETRIC
: /* Set the metric on the interface
2423 (currently unused) */
2426 case SIOCGIFMTU
: /* Get the MTU of a device */
2427 ifr
->ifr_mtu
= dev
->mtu
;
2430 case SIOCSIFMTU
: /* Set the MTU of a device */
2431 return dev_set_mtu(dev
, ifr
->ifr_mtu
);
2435 memset(ifr
->ifr_hwaddr
.sa_data
, 0, sizeof ifr
->ifr_hwaddr
.sa_data
);
2437 memcpy(ifr
->ifr_hwaddr
.sa_data
, dev
->dev_addr
,
2438 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
2439 ifr
->ifr_hwaddr
.sa_family
= dev
->type
;
2443 return dev_set_mac_address(dev
, &ifr
->ifr_hwaddr
);
2445 case SIOCSIFHWBROADCAST
:
2446 if (ifr
->ifr_hwaddr
.sa_family
!= dev
->type
)
2448 memcpy(dev
->broadcast
, ifr
->ifr_hwaddr
.sa_data
,
2449 min(sizeof ifr
->ifr_hwaddr
.sa_data
, (size_t) dev
->addr_len
));
2450 raw_notifier_call_chain(&netdev_chain
,
2451 NETDEV_CHANGEADDR
, dev
);
2455 ifr
->ifr_map
.mem_start
= dev
->mem_start
;
2456 ifr
->ifr_map
.mem_end
= dev
->mem_end
;
2457 ifr
->ifr_map
.base_addr
= dev
->base_addr
;
2458 ifr
->ifr_map
.irq
= dev
->irq
;
2459 ifr
->ifr_map
.dma
= dev
->dma
;
2460 ifr
->ifr_map
.port
= dev
->if_port
;
2464 if (dev
->set_config
) {
2465 if (!netif_device_present(dev
))
2467 return dev
->set_config(dev
, &ifr
->ifr_map
);
2472 if (!dev
->set_multicast_list
||
2473 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
2475 if (!netif_device_present(dev
))
2477 return dev_mc_add(dev
, ifr
->ifr_hwaddr
.sa_data
,
2481 if (!dev
->set_multicast_list
||
2482 ifr
->ifr_hwaddr
.sa_family
!= AF_UNSPEC
)
2484 if (!netif_device_present(dev
))
2486 return dev_mc_delete(dev
, ifr
->ifr_hwaddr
.sa_data
,
2490 ifr
->ifr_ifindex
= dev
->ifindex
;
2494 ifr
->ifr_qlen
= dev
->tx_queue_len
;
2498 if (ifr
->ifr_qlen
< 0)
2500 dev
->tx_queue_len
= ifr
->ifr_qlen
;
2504 ifr
->ifr_newname
[IFNAMSIZ
-1] = '\0';
2505 return dev_change_name(dev
, ifr
->ifr_newname
);
2508 * Unknown or private ioctl
2512 if ((cmd
>= SIOCDEVPRIVATE
&&
2513 cmd
<= SIOCDEVPRIVATE
+ 15) ||
2514 cmd
== SIOCBONDENSLAVE
||
2515 cmd
== SIOCBONDRELEASE
||
2516 cmd
== SIOCBONDSETHWADDR
||
2517 cmd
== SIOCBONDSLAVEINFOQUERY
||
2518 cmd
== SIOCBONDINFOQUERY
||
2519 cmd
== SIOCBONDCHANGEACTIVE
||
2520 cmd
== SIOCGMIIPHY
||
2521 cmd
== SIOCGMIIREG
||
2522 cmd
== SIOCSMIIREG
||
2523 cmd
== SIOCBRADDIF
||
2524 cmd
== SIOCBRDELIF
||
2525 cmd
== SIOCWANDEV
) {
2527 if (dev
->do_ioctl
) {
2528 if (netif_device_present(dev
))
2529 err
= dev
->do_ioctl(dev
, ifr
,
2542 * This function handles all "interface"-type I/O control requests. The actual
2543 * 'doing' part of this is dev_ifsioc above.
2547 * dev_ioctl - network device ioctl
2548 * @cmd: command to issue
2549 * @arg: pointer to a struct ifreq in user space
2551 * Issue ioctl functions to devices. This is normally called by the
2552 * user space syscall interfaces but can sometimes be useful for
2553 * other purposes. The return value is the return from the syscall if
2554 * positive or a negative errno code on error.
2557 int dev_ioctl(unsigned int cmd
, void __user
*arg
)
2563 /* One special case: SIOCGIFCONF takes ifconf argument
2564 and requires shared lock, because it sleeps writing
2568 if (cmd
== SIOCGIFCONF
) {
2570 ret
= dev_ifconf((char __user
*) arg
);
2574 if (cmd
== SIOCGIFNAME
)
2575 return dev_ifname((struct ifreq __user
*)arg
);
2577 if (copy_from_user(&ifr
, arg
, sizeof(struct ifreq
)))
2580 ifr
.ifr_name
[IFNAMSIZ
-1] = 0;
2582 colon
= strchr(ifr
.ifr_name
, ':');
2587 * See which interface the caller is talking about.
2592 * These ioctl calls:
2593 * - can be done by all.
2594 * - atomic and do not require locking.
2605 dev_load(ifr
.ifr_name
);
2606 read_lock(&dev_base_lock
);
2607 ret
= dev_ifsioc(&ifr
, cmd
);
2608 read_unlock(&dev_base_lock
);
2612 if (copy_to_user(arg
, &ifr
,
2613 sizeof(struct ifreq
)))
2619 dev_load(ifr
.ifr_name
);
2621 ret
= dev_ethtool(&ifr
);
2626 if (copy_to_user(arg
, &ifr
,
2627 sizeof(struct ifreq
)))
2633 * These ioctl calls:
2634 * - require superuser power.
2635 * - require strict serialization.
2641 if (!capable(CAP_NET_ADMIN
))
2643 dev_load(ifr
.ifr_name
);
2645 ret
= dev_ifsioc(&ifr
, cmd
);
2650 if (copy_to_user(arg
, &ifr
,
2651 sizeof(struct ifreq
)))
2657 * These ioctl calls:
2658 * - require superuser power.
2659 * - require strict serialization.
2660 * - do not return a value
2670 case SIOCSIFHWBROADCAST
:
2673 case SIOCBONDENSLAVE
:
2674 case SIOCBONDRELEASE
:
2675 case SIOCBONDSETHWADDR
:
2676 case SIOCBONDCHANGEACTIVE
:
2679 if (!capable(CAP_NET_ADMIN
))
2682 case SIOCBONDSLAVEINFOQUERY
:
2683 case SIOCBONDINFOQUERY
:
2684 dev_load(ifr
.ifr_name
);
2686 ret
= dev_ifsioc(&ifr
, cmd
);
2691 /* Get the per device memory space. We can add this but
2692 * currently do not support it */
2694 /* Set the per device memory buffer space.
2695 * Not applicable in our case */
2700 * Unknown or private ioctl.
2703 if (cmd
== SIOCWANDEV
||
2704 (cmd
>= SIOCDEVPRIVATE
&&
2705 cmd
<= SIOCDEVPRIVATE
+ 15)) {
2706 dev_load(ifr
.ifr_name
);
2708 ret
= dev_ifsioc(&ifr
, cmd
);
2710 if (!ret
&& copy_to_user(arg
, &ifr
,
2711 sizeof(struct ifreq
)))
2715 #ifdef CONFIG_WIRELESS_EXT
2716 /* Take care of Wireless Extensions */
2717 if (cmd
>= SIOCIWFIRST
&& cmd
<= SIOCIWLAST
) {
2718 /* If command is `set a parameter', or
2719 * `get the encoding parameters', check if
2720 * the user has the right to do it */
2721 if (IW_IS_SET(cmd
) || cmd
== SIOCGIWENCODE
2722 || cmd
== SIOCGIWENCODEEXT
) {
2723 if (!capable(CAP_NET_ADMIN
))
2726 dev_load(ifr
.ifr_name
);
2728 /* Follow me in net/core/wireless.c */
2729 ret
= wireless_process_ioctl(&ifr
, cmd
);
2731 if (IW_IS_GET(cmd
) &&
2732 copy_to_user(arg
, &ifr
,
2733 sizeof(struct ifreq
)))
2737 #endif /* CONFIG_WIRELESS_EXT */
2744 * dev_new_index - allocate an ifindex
2746 * Returns a suitable unique value for a new device interface
2747 * number. The caller must hold the rtnl semaphore or the
2748 * dev_base_lock to be sure it remains unique.
2750 static int dev_new_index(void)
2756 if (!__dev_get_by_index(ifindex
))
2761 static int dev_boot_phase
= 1;
2763 /* Delayed registration/unregisteration */
2764 static DEFINE_SPINLOCK(net_todo_list_lock
);
2765 static struct list_head net_todo_list
= LIST_HEAD_INIT(net_todo_list
);
2767 static inline void net_set_todo(struct net_device
*dev
)
2769 spin_lock(&net_todo_list_lock
);
2770 list_add_tail(&dev
->todo_list
, &net_todo_list
);
2771 spin_unlock(&net_todo_list_lock
);
2775 * register_netdevice - register a network device
2776 * @dev: device to register
2778 * Take a completed network device structure and add it to the kernel
2779 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
2780 * chain. 0 is returned on success. A negative errno code is returned
2781 * on a failure to set up the device, or if the name is a duplicate.
2783 * Callers must hold the rtnl semaphore. You may want
2784 * register_netdev() instead of this.
2787 * The locking appears insufficient to guarantee two parallel registers
2788 * will not get the same name.
2791 int register_netdevice(struct net_device
*dev
)
2793 struct hlist_head
*head
;
2794 struct hlist_node
*p
;
2797 BUG_ON(dev_boot_phase
);
2802 /* When net_device's are persistent, this will be fatal. */
2803 BUG_ON(dev
->reg_state
!= NETREG_UNINITIALIZED
);
2805 spin_lock_init(&dev
->queue_lock
);
2806 spin_lock_init(&dev
->_xmit_lock
);
2807 dev
->xmit_lock_owner
= -1;
2808 #ifdef CONFIG_NET_CLS_ACT
2809 spin_lock_init(&dev
->ingress_lock
);
2812 ret
= alloc_divert_blk(dev
);
2818 /* Init, if this function is available */
2820 ret
= dev
->init(dev
);
2828 if (!dev_valid_name(dev
->name
)) {
2833 dev
->ifindex
= dev_new_index();
2834 if (dev
->iflink
== -1)
2835 dev
->iflink
= dev
->ifindex
;
2837 /* Check for existence of name */
2838 head
= dev_name_hash(dev
->name
);
2839 hlist_for_each(p
, head
) {
2840 struct net_device
*d
2841 = hlist_entry(p
, struct net_device
, name_hlist
);
2842 if (!strncmp(d
->name
, dev
->name
, IFNAMSIZ
)) {
2848 /* Fix illegal SG+CSUM combinations. */
2849 if ((dev
->features
& NETIF_F_SG
) &&
2850 !(dev
->features
& (NETIF_F_IP_CSUM
|
2852 NETIF_F_HW_CSUM
))) {
2853 printk("%s: Dropping NETIF_F_SG since no checksum feature.\n",
2855 dev
->features
&= ~NETIF_F_SG
;
2858 /* TSO requires that SG is present as well. */
2859 if ((dev
->features
& NETIF_F_TSO
) &&
2860 !(dev
->features
& NETIF_F_SG
)) {
2861 printk("%s: Dropping NETIF_F_TSO since no SG feature.\n",
2863 dev
->features
&= ~NETIF_F_TSO
;
2865 if (dev
->features
& NETIF_F_UFO
) {
2866 if (!(dev
->features
& NETIF_F_HW_CSUM
)) {
2867 printk(KERN_ERR
"%s: Dropping NETIF_F_UFO since no "
2868 "NETIF_F_HW_CSUM feature.\n",
2870 dev
->features
&= ~NETIF_F_UFO
;
2872 if (!(dev
->features
& NETIF_F_SG
)) {
2873 printk(KERN_ERR
"%s: Dropping NETIF_F_UFO since no "
2874 "NETIF_F_SG feature.\n",
2876 dev
->features
&= ~NETIF_F_UFO
;
2881 * nil rebuild_header routine,
2882 * that should be never called and used as just bug trap.
2885 if (!dev
->rebuild_header
)
2886 dev
->rebuild_header
= default_rebuild_header
;
2888 ret
= netdev_register_sysfs(dev
);
2891 dev
->reg_state
= NETREG_REGISTERED
;
2894 * Default initial state at registry is that the
2895 * device is present.
2898 set_bit(__LINK_STATE_PRESENT
, &dev
->state
);
2901 dev_init_scheduler(dev
);
2902 write_lock_bh(&dev_base_lock
);
2904 dev_tail
= &dev
->next
;
2905 hlist_add_head(&dev
->name_hlist
, head
);
2906 hlist_add_head(&dev
->index_hlist
, dev_index_hash(dev
->ifindex
));
2908 write_unlock_bh(&dev_base_lock
);
2910 /* Notify protocols, that a new device appeared. */
2911 raw_notifier_call_chain(&netdev_chain
, NETDEV_REGISTER
, dev
);
2918 free_divert_blk(dev
);
2923 * register_netdev - register a network device
2924 * @dev: device to register
2926 * Take a completed network device structure and add it to the kernel
2927 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
2928 * chain. 0 is returned on success. A negative errno code is returned
2929 * on a failure to set up the device, or if the name is a duplicate.
2931 * This is a wrapper around register_netdev that takes the rtnl semaphore
2932 * and expands the device name if you passed a format string to
2935 int register_netdev(struct net_device
*dev
)
2942 * If the name is a format string the caller wants us to do a
2945 if (strchr(dev
->name
, '%')) {
2946 err
= dev_alloc_name(dev
, dev
->name
);
2952 * Back compatibility hook. Kill this one in 2.5
2954 if (dev
->name
[0] == 0 || dev
->name
[0] == ' ') {
2955 err
= dev_alloc_name(dev
, "eth%d");
2960 err
= register_netdevice(dev
);
2965 EXPORT_SYMBOL(register_netdev
);
2968 * netdev_wait_allrefs - wait until all references are gone.
2970 * This is called when unregistering network devices.
2972 * Any protocol or device that holds a reference should register
2973 * for netdevice notification, and cleanup and put back the
2974 * reference if they receive an UNREGISTER event.
2975 * We can get stuck here if buggy protocols don't correctly
2978 static void netdev_wait_allrefs(struct net_device
*dev
)
2980 unsigned long rebroadcast_time
, warning_time
;
2982 rebroadcast_time
= warning_time
= jiffies
;
2983 while (atomic_read(&dev
->refcnt
) != 0) {
2984 if (time_after(jiffies
, rebroadcast_time
+ 1 * HZ
)) {
2987 /* Rebroadcast unregister notification */
2988 raw_notifier_call_chain(&netdev_chain
,
2989 NETDEV_UNREGISTER
, dev
);
2991 if (test_bit(__LINK_STATE_LINKWATCH_PENDING
,
2993 /* We must not have linkwatch events
2994 * pending on unregister. If this
2995 * happens, we simply run the queue
2996 * unscheduled, resulting in a noop
2999 linkwatch_run_queue();
3004 rebroadcast_time
= jiffies
;
3009 if (time_after(jiffies
, warning_time
+ 10 * HZ
)) {
3010 printk(KERN_EMERG
"unregister_netdevice: "
3011 "waiting for %s to become free. Usage "
3013 dev
->name
, atomic_read(&dev
->refcnt
));
3014 warning_time
= jiffies
;
3023 * register_netdevice(x1);
3024 * register_netdevice(x2);
3026 * unregister_netdevice(y1);
3027 * unregister_netdevice(y2);
3033 * We are invoked by rtnl_unlock() after it drops the semaphore.
3034 * This allows us to deal with problems:
3035 * 1) We can delete sysfs objects which invoke hotplug
3036 * without deadlocking with linkwatch via keventd.
3037 * 2) Since we run with the RTNL semaphore not held, we can sleep
3038 * safely in order to wait for the netdev refcnt to drop to zero.
3040 static DEFINE_MUTEX(net_todo_run_mutex
);
3041 void netdev_run_todo(void)
3043 struct list_head list
= LIST_HEAD_INIT(list
);
3045 /* Need to guard against multiple cpu's getting out of order. */
3046 mutex_lock(&net_todo_run_mutex
);
3048 /* Not safe to do outside the semaphore. We must not return
3049 * until all unregister events invoked by the local processor
3050 * have been completed (either by this todo run, or one on
3053 if (list_empty(&net_todo_list
))
3056 /* Snapshot list, allow later requests */
3057 spin_lock(&net_todo_list_lock
);
3058 list_splice_init(&net_todo_list
, &list
);
3059 spin_unlock(&net_todo_list_lock
);
3061 while (!list_empty(&list
)) {
3062 struct net_device
*dev
3063 = list_entry(list
.next
, struct net_device
, todo_list
);
3064 list_del(&dev
->todo_list
);
3066 if (unlikely(dev
->reg_state
!= NETREG_UNREGISTERING
)) {
3067 printk(KERN_ERR
"network todo '%s' but state %d\n",
3068 dev
->name
, dev
->reg_state
);
3073 netdev_unregister_sysfs(dev
);
3074 dev
->reg_state
= NETREG_UNREGISTERED
;
3076 netdev_wait_allrefs(dev
);
3079 BUG_ON(atomic_read(&dev
->refcnt
));
3080 BUG_TRAP(!dev
->ip_ptr
);
3081 BUG_TRAP(!dev
->ip6_ptr
);
3082 BUG_TRAP(!dev
->dn_ptr
);
3084 /* It must be the very last action,
3085 * after this 'dev' may point to freed up memory.
3087 if (dev
->destructor
)
3088 dev
->destructor(dev
);
3092 mutex_unlock(&net_todo_run_mutex
);
3096 * alloc_netdev - allocate network device
3097 * @sizeof_priv: size of private data to allocate space for
3098 * @name: device name format string
3099 * @setup: callback to initialize device
3101 * Allocates a struct net_device with private data area for driver use
3102 * and performs basic initialization.
3104 struct net_device
*alloc_netdev(int sizeof_priv
, const char *name
,
3105 void (*setup
)(struct net_device
*))
3108 struct net_device
*dev
;
3111 /* ensure 32-byte alignment of both the device and private area */
3112 alloc_size
= (sizeof(*dev
) + NETDEV_ALIGN_CONST
) & ~NETDEV_ALIGN_CONST
;
3113 alloc_size
+= sizeof_priv
+ NETDEV_ALIGN_CONST
;
3115 p
= kzalloc(alloc_size
, GFP_KERNEL
);
3117 printk(KERN_ERR
"alloc_dev: Unable to allocate device.\n");
3121 dev
= (struct net_device
*)
3122 (((long)p
+ NETDEV_ALIGN_CONST
) & ~NETDEV_ALIGN_CONST
);
3123 dev
->padded
= (char *)dev
- (char *)p
;
3126 dev
->priv
= netdev_priv(dev
);
3129 strcpy(dev
->name
, name
);
3132 EXPORT_SYMBOL(alloc_netdev
);
3135 * free_netdev - free network device
3138 * This function does the last stage of destroying an allocated device
3139 * interface. The reference to the device object is released.
3140 * If this is the last reference then it will be freed.
3142 void free_netdev(struct net_device
*dev
)
3145 /* Compatibility with error handling in drivers */
3146 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
3147 kfree((char *)dev
- dev
->padded
);
3151 BUG_ON(dev
->reg_state
!= NETREG_UNREGISTERED
);
3152 dev
->reg_state
= NETREG_RELEASED
;
3154 /* will free via class release */
3155 class_device_put(&dev
->class_dev
);
3157 kfree((char *)dev
- dev
->padded
);
3161 /* Synchronize with packet receive processing. */
3162 void synchronize_net(void)
3169 * unregister_netdevice - remove device from the kernel
3172 * This function shuts down a device interface and removes it
3173 * from the kernel tables. On success 0 is returned, on a failure
3174 * a negative errno code is returned.
3176 * Callers must hold the rtnl semaphore. You may want
3177 * unregister_netdev() instead of this.
3180 int unregister_netdevice(struct net_device
*dev
)
3182 struct net_device
*d
, **dp
;
3184 BUG_ON(dev_boot_phase
);
3187 /* Some devices call without registering for initialization unwind. */
3188 if (dev
->reg_state
== NETREG_UNINITIALIZED
) {
3189 printk(KERN_DEBUG
"unregister_netdevice: device %s/%p never "
3190 "was registered\n", dev
->name
, dev
);
3194 BUG_ON(dev
->reg_state
!= NETREG_REGISTERED
);
3196 /* If device is running, close it first. */
3197 if (dev
->flags
& IFF_UP
)
3200 /* And unlink it from device chain. */
3201 for (dp
= &dev_base
; (d
= *dp
) != NULL
; dp
= &d
->next
) {
3203 write_lock_bh(&dev_base_lock
);
3204 hlist_del(&dev
->name_hlist
);
3205 hlist_del(&dev
->index_hlist
);
3206 if (dev_tail
== &dev
->next
)
3209 write_unlock_bh(&dev_base_lock
);
3214 printk(KERN_ERR
"unregister net_device: '%s' not found\n",
3219 dev
->reg_state
= NETREG_UNREGISTERING
;
3223 /* Shutdown queueing discipline. */
3227 /* Notify protocols, that we are about to destroy
3228 this device. They should clean all the things.
3230 raw_notifier_call_chain(&netdev_chain
, NETDEV_UNREGISTER
, dev
);
3233 * Flush the multicast chain
3235 dev_mc_discard(dev
);
3240 /* Notifier chain MUST detach us from master device. */
3241 BUG_TRAP(!dev
->master
);
3243 free_divert_blk(dev
);
3245 /* Finish processing unregister after unlock */
3255 * unregister_netdev - remove device from the kernel
3258 * This function shuts down a device interface and removes it
3259 * from the kernel tables. On success 0 is returned, on a failure
3260 * a negative errno code is returned.
3262 * This is just a wrapper for unregister_netdevice that takes
3263 * the rtnl semaphore. In general you want to use this and not
3264 * unregister_netdevice.
3266 void unregister_netdev(struct net_device
*dev
)
3269 unregister_netdevice(dev
);
3273 EXPORT_SYMBOL(unregister_netdev
);
3275 #ifdef CONFIG_HOTPLUG_CPU
3276 static int dev_cpu_callback(struct notifier_block
*nfb
,
3277 unsigned long action
,
3280 struct sk_buff
**list_skb
;
3281 struct net_device
**list_net
;
3282 struct sk_buff
*skb
;
3283 unsigned int cpu
, oldcpu
= (unsigned long)ocpu
;
3284 struct softnet_data
*sd
, *oldsd
;
3286 if (action
!= CPU_DEAD
)
3289 local_irq_disable();
3290 cpu
= smp_processor_id();
3291 sd
= &per_cpu(softnet_data
, cpu
);
3292 oldsd
= &per_cpu(softnet_data
, oldcpu
);
3294 /* Find end of our completion_queue. */
3295 list_skb
= &sd
->completion_queue
;
3297 list_skb
= &(*list_skb
)->next
;
3298 /* Append completion queue from offline CPU. */
3299 *list_skb
= oldsd
->completion_queue
;
3300 oldsd
->completion_queue
= NULL
;
3302 /* Find end of our output_queue. */
3303 list_net
= &sd
->output_queue
;
3305 list_net
= &(*list_net
)->next_sched
;
3306 /* Append output queue from offline CPU. */
3307 *list_net
= oldsd
->output_queue
;
3308 oldsd
->output_queue
= NULL
;
3310 raise_softirq_irqoff(NET_TX_SOFTIRQ
);
3313 /* Process offline CPU's input_pkt_queue */
3314 while ((skb
= __skb_dequeue(&oldsd
->input_pkt_queue
)))
3319 #endif /* CONFIG_HOTPLUG_CPU */
3321 #ifdef CONFIG_NET_DMA
3323 * net_dma_rebalance -
3324 * This is called when the number of channels allocated to the net_dma_client
3325 * changes. The net_dma_client tries to have one DMA channel per CPU.
3327 static void net_dma_rebalance(void)
3329 unsigned int cpu
, i
, n
;
3330 struct dma_chan
*chan
;
3334 if (net_dma_count
== 0) {
3335 for_each_online_cpu(cpu
)
3336 rcu_assign_pointer(per_cpu(softnet_data
.net_dma
, cpu
), NULL
);
3337 unlock_cpu_hotplug();
3342 cpu
= first_cpu(cpu_online_map
);
3345 list_for_each_entry(chan
, &net_dma_client
->channels
, client_node
) {
3346 n
= ((num_online_cpus() / net_dma_count
)
3347 + (i
< (num_online_cpus() % net_dma_count
) ? 1 : 0));
3350 per_cpu(softnet_data
.net_dma
, cpu
) = chan
;
3351 cpu
= next_cpu(cpu
, cpu_online_map
);
3358 unlock_cpu_hotplug();
3362 * netdev_dma_event - event callback for the net_dma_client
3363 * @client: should always be net_dma_client
3367 static void netdev_dma_event(struct dma_client
*client
, struct dma_chan
*chan
,
3368 enum dma_event event
)
3370 spin_lock(&net_dma_event_lock
);
3372 case DMA_RESOURCE_ADDED
:
3374 net_dma_rebalance();
3376 case DMA_RESOURCE_REMOVED
:
3378 net_dma_rebalance();
3383 spin_unlock(&net_dma_event_lock
);
3387 * netdev_dma_regiser - register the networking subsystem as a DMA client
3389 static int __init
netdev_dma_register(void)
3391 spin_lock_init(&net_dma_event_lock
);
3392 net_dma_client
= dma_async_client_register(netdev_dma_event
);
3393 if (net_dma_client
== NULL
)
3396 dma_async_client_chan_request(net_dma_client
, num_online_cpus());
3401 static int __init
netdev_dma_register(void) { return -ENODEV
; }
3402 #endif /* CONFIG_NET_DMA */
3405 * Initialize the DEV module. At boot time this walks the device list and
3406 * unhooks any devices that fail to initialise (normally hardware not
3407 * present) and leaves us with a valid list of present and active devices.
3412 * This is called single threaded during boot, so no need
3413 * to take the rtnl semaphore.
3415 static int __init
net_dev_init(void)
3417 int i
, rc
= -ENOMEM
;
3419 BUG_ON(!dev_boot_phase
);
3423 if (dev_proc_init())
3426 if (netdev_sysfs_init())
3429 INIT_LIST_HEAD(&ptype_all
);
3430 for (i
= 0; i
< 16; i
++)
3431 INIT_LIST_HEAD(&ptype_base
[i
]);
3433 for (i
= 0; i
< ARRAY_SIZE(dev_name_head
); i
++)
3434 INIT_HLIST_HEAD(&dev_name_head
[i
]);
3436 for (i
= 0; i
< ARRAY_SIZE(dev_index_head
); i
++)
3437 INIT_HLIST_HEAD(&dev_index_head
[i
]);
3440 * Initialise the packet receive queues.
3443 for_each_possible_cpu(i
) {
3444 struct softnet_data
*queue
;
3446 queue
= &per_cpu(softnet_data
, i
);
3447 skb_queue_head_init(&queue
->input_pkt_queue
);
3448 queue
->completion_queue
= NULL
;
3449 INIT_LIST_HEAD(&queue
->poll_list
);
3450 set_bit(__LINK_STATE_START
, &queue
->backlog_dev
.state
);
3451 queue
->backlog_dev
.weight
= weight_p
;
3452 queue
->backlog_dev
.poll
= process_backlog
;
3453 atomic_set(&queue
->backlog_dev
.refcnt
, 1);
3456 netdev_dma_register();
3460 open_softirq(NET_TX_SOFTIRQ
, net_tx_action
, NULL
);
3461 open_softirq(NET_RX_SOFTIRQ
, net_rx_action
, NULL
);
3463 hotcpu_notifier(dev_cpu_callback
, 0);
3471 subsys_initcall(net_dev_init
);
3473 EXPORT_SYMBOL(__dev_get_by_index
);
3474 EXPORT_SYMBOL(__dev_get_by_name
);
3475 EXPORT_SYMBOL(__dev_remove_pack
);
3476 EXPORT_SYMBOL(__skb_linearize
);
3477 EXPORT_SYMBOL(dev_valid_name
);
3478 EXPORT_SYMBOL(dev_add_pack
);
3479 EXPORT_SYMBOL(dev_alloc_name
);
3480 EXPORT_SYMBOL(dev_close
);
3481 EXPORT_SYMBOL(dev_get_by_flags
);
3482 EXPORT_SYMBOL(dev_get_by_index
);
3483 EXPORT_SYMBOL(dev_get_by_name
);
3484 EXPORT_SYMBOL(dev_open
);
3485 EXPORT_SYMBOL(dev_queue_xmit
);
3486 EXPORT_SYMBOL(dev_remove_pack
);
3487 EXPORT_SYMBOL(dev_set_allmulti
);
3488 EXPORT_SYMBOL(dev_set_promiscuity
);
3489 EXPORT_SYMBOL(dev_change_flags
);
3490 EXPORT_SYMBOL(dev_set_mtu
);
3491 EXPORT_SYMBOL(dev_set_mac_address
);
3492 EXPORT_SYMBOL(free_netdev
);
3493 EXPORT_SYMBOL(netdev_boot_setup_check
);
3494 EXPORT_SYMBOL(netdev_set_master
);
3495 EXPORT_SYMBOL(netdev_state_change
);
3496 EXPORT_SYMBOL(netif_receive_skb
);
3497 EXPORT_SYMBOL(netif_rx
);
3498 EXPORT_SYMBOL(register_gifconf
);
3499 EXPORT_SYMBOL(register_netdevice
);
3500 EXPORT_SYMBOL(register_netdevice_notifier
);
3501 EXPORT_SYMBOL(skb_checksum_help
);
3502 EXPORT_SYMBOL(synchronize_net
);
3503 EXPORT_SYMBOL(unregister_netdevice
);
3504 EXPORT_SYMBOL(unregister_netdevice_notifier
);
3505 EXPORT_SYMBOL(net_enable_timestamp
);
3506 EXPORT_SYMBOL(net_disable_timestamp
);
3507 EXPORT_SYMBOL(dev_get_flags
);
3509 #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
3510 EXPORT_SYMBOL(br_handle_frame_hook
);
3511 EXPORT_SYMBOL(br_fdb_get_hook
);
3512 EXPORT_SYMBOL(br_fdb_put_hook
);
3516 EXPORT_SYMBOL(dev_load
);
3519 EXPORT_PER_CPU_SYMBOL(softnet_data
);