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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * NET3 Protocol independent device support routines.
3 *
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.
8 *
9 * Derived from the non IP parts of dev.c 1.0.19
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
13 *
14 * Additional Authors:
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>
21 *
22 * Changes:
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
34 * drivers
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
44 * call a packet.
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
50 * changes.
51 * Rudi Cilibrasi : Pass the right thing to
52 * set_mac_address()
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
58 * 1 device.
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
66 * the backlog queue.
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
73 */
74
75#include <asm/uaccess.h>
76#include <asm/system.h>
77#include <linux/bitops.h>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080078#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070079#include <linux/config.h>
80#include <linux/cpu.h>
81#include <linux/types.h>
82#include <linux/kernel.h>
83#include <linux/sched.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080084#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#include <linux/string.h>
86#include <linux/mm.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>
96#include <net/sock.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>
103#include <net/dst.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>
Adrian Bunkd86b5e02006-01-21 00:46:55 +0100114#include <linux/wireless.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115#include <net/iw_handler.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116#include <asm/current.h>
Steve Grubb5bdb9882005-12-03 08:39:35 -0500117#include <linux/audit.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119/*
120 * The list of packet types we will receive (as opposed to discard)
121 * and the routines to invoke.
122 *
123 * Why 16. Because with 16 the only overlap we get on a hash of the
124 * low nibble of the protocol value is RARP/SNAP/X.25.
125 *
126 * NOTE: That is no longer true with the addition of VLAN tags. Not
127 * sure which should go first, but I bet it won't make much
128 * difference if we are running VLANs. The good news is that
129 * this protocol won't be in the list unless compiled in, so
Stephen Hemminger3041a062006-05-26 13:25:24 -0700130 * the average user (w/out VLANs) will not be adversely affected.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 * --BLG
132 *
133 * 0800 IP
134 * 8100 802.1Q VLAN
135 * 0001 802.3
136 * 0002 AX.25
137 * 0004 802.2
138 * 8035 RARP
139 * 0005 SNAP
140 * 0805 X.25
141 * 0806 ARP
142 * 8137 IPX
143 * 0009 Localtalk
144 * 86DD IPv6
145 */
146
147static DEFINE_SPINLOCK(ptype_lock);
148static struct list_head ptype_base[16]; /* 16 way hashed list */
149static struct list_head ptype_all; /* Taps */
150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151/*
Stephen Hemminger3041a062006-05-26 13:25:24 -0700152 * The @dev_base list is protected by @dev_base_lock and the rtnl
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 * semaphore.
154 *
155 * Pure readers hold dev_base_lock for reading.
156 *
157 * Writers must hold the rtnl semaphore while they loop through the
158 * dev_base list, and hold dev_base_lock for writing when they do the
159 * actual updates. This allows pure readers to access the list even
160 * while a writer is preparing to update it.
161 *
162 * To put it another way, dev_base_lock is held for writing only to
163 * protect against pure readers; the rtnl semaphore provides the
164 * protection against other writers.
165 *
166 * See, for example usages, register_netdevice() and
167 * unregister_netdevice(), which must be called with the rtnl
168 * semaphore held.
169 */
170struct net_device *dev_base;
171static struct net_device **dev_tail = &dev_base;
172DEFINE_RWLOCK(dev_base_lock);
173
174EXPORT_SYMBOL(dev_base);
175EXPORT_SYMBOL(dev_base_lock);
176
177#define NETDEV_HASHBITS 8
178static struct hlist_head dev_name_head[1<<NETDEV_HASHBITS];
179static struct hlist_head dev_index_head[1<<NETDEV_HASHBITS];
180
181static inline struct hlist_head *dev_name_hash(const char *name)
182{
183 unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ));
184 return &dev_name_head[hash & ((1<<NETDEV_HASHBITS)-1)];
185}
186
187static inline struct hlist_head *dev_index_hash(int ifindex)
188{
189 return &dev_index_head[ifindex & ((1<<NETDEV_HASHBITS)-1)];
190}
191
192/*
193 * Our notifier list
194 */
195
Alan Sternf07d5b92006-05-09 15:23:03 -0700196static RAW_NOTIFIER_HEAD(netdev_chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198/*
199 * Device drivers call our routines to queue packets here. We empty the
200 * queue in the local softnet handler.
201 */
Stephen Hemminger31aa02c2005-06-23 20:12:48 -0700202DEFINE_PER_CPU(struct softnet_data, softnet_data) = { NULL };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203
204#ifdef CONFIG_SYSFS
205extern int netdev_sysfs_init(void);
206extern int netdev_register_sysfs(struct net_device *);
207extern void netdev_unregister_sysfs(struct net_device *);
208#else
209#define netdev_sysfs_init() (0)
210#define netdev_register_sysfs(dev) (0)
211#define netdev_unregister_sysfs(dev) do { } while(0)
212#endif
213
214
215/*******************************************************************************
216
217 Protocol management and registration routines
218
219*******************************************************************************/
220
221/*
222 * For efficiency
223 */
224
225int netdev_nit;
226
227/*
228 * Add a protocol ID to the list. Now that the input handler is
229 * smarter we can dispense with all the messy stuff that used to be
230 * here.
231 *
232 * BEWARE!!! Protocol handlers, mangling input packets,
233 * MUST BE last in hash buckets and checking protocol handlers
234 * MUST start from promiscuous ptype_all chain in net_bh.
235 * It is true now, do not change it.
236 * Explanation follows: if protocol handler, mangling packet, will
237 * be the first on list, it is not able to sense, that packet
238 * is cloned and should be copied-on-write, so that it will
239 * change it and subsequent readers will get broken packet.
240 * --ANK (980803)
241 */
242
243/**
244 * dev_add_pack - add packet handler
245 * @pt: packet type declaration
246 *
247 * Add a protocol handler to the networking stack. The passed &packet_type
248 * is linked into kernel lists and may not be freed until it has been
249 * removed from the kernel lists.
250 *
251 * This call does not sleep therefore it can not
252 * guarantee all CPU's that are in middle of receiving packets
253 * will see the new packet type (until the next received packet).
254 */
255
256void dev_add_pack(struct packet_type *pt)
257{
258 int hash;
259
260 spin_lock_bh(&ptype_lock);
261 if (pt->type == htons(ETH_P_ALL)) {
262 netdev_nit++;
263 list_add_rcu(&pt->list, &ptype_all);
264 } else {
265 hash = ntohs(pt->type) & 15;
266 list_add_rcu(&pt->list, &ptype_base[hash]);
267 }
268 spin_unlock_bh(&ptype_lock);
269}
270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271/**
272 * __dev_remove_pack - remove packet handler
273 * @pt: packet type declaration
274 *
275 * Remove a protocol handler that was previously added to the kernel
276 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
277 * from the kernel lists and can be freed or reused once this function
278 * returns.
279 *
280 * The packet type might still be in use by receivers
281 * and must not be freed until after all the CPU's have gone
282 * through a quiescent state.
283 */
284void __dev_remove_pack(struct packet_type *pt)
285{
286 struct list_head *head;
287 struct packet_type *pt1;
288
289 spin_lock_bh(&ptype_lock);
290
291 if (pt->type == htons(ETH_P_ALL)) {
292 netdev_nit--;
293 head = &ptype_all;
294 } else
295 head = &ptype_base[ntohs(pt->type) & 15];
296
297 list_for_each_entry(pt1, head, list) {
298 if (pt == pt1) {
299 list_del_rcu(&pt->list);
300 goto out;
301 }
302 }
303
304 printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
305out:
306 spin_unlock_bh(&ptype_lock);
307}
308/**
309 * dev_remove_pack - remove packet handler
310 * @pt: packet type declaration
311 *
312 * Remove a protocol handler that was previously added to the kernel
313 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
314 * from the kernel lists and can be freed or reused once this function
315 * returns.
316 *
317 * This call sleeps to guarantee that no CPU is looking at the packet
318 * type after return.
319 */
320void dev_remove_pack(struct packet_type *pt)
321{
322 __dev_remove_pack(pt);
323
324 synchronize_net();
325}
326
327/******************************************************************************
328
329 Device Boot-time Settings Routines
330
331*******************************************************************************/
332
333/* Boot time configuration table */
334static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
335
336/**
337 * netdev_boot_setup_add - add new setup entry
338 * @name: name of the device
339 * @map: configured settings for the device
340 *
341 * Adds new setup entry to the dev_boot_setup list. The function
342 * returns 0 on error and 1 on success. This is a generic routine to
343 * all netdevices.
344 */
345static int netdev_boot_setup_add(char *name, struct ifmap *map)
346{
347 struct netdev_boot_setup *s;
348 int i;
349
350 s = dev_boot_setup;
351 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
352 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
353 memset(s[i].name, 0, sizeof(s[i].name));
354 strcpy(s[i].name, name);
355 memcpy(&s[i].map, map, sizeof(s[i].map));
356 break;
357 }
358 }
359
360 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
361}
362
363/**
364 * netdev_boot_setup_check - check boot time settings
365 * @dev: the netdevice
366 *
367 * Check boot time settings for the device.
368 * The found settings are set for the device to be used
369 * later in the device probing.
370 * Returns 0 if no settings found, 1 if they are.
371 */
372int netdev_boot_setup_check(struct net_device *dev)
373{
374 struct netdev_boot_setup *s = dev_boot_setup;
375 int i;
376
377 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
378 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
379 !strncmp(dev->name, s[i].name, strlen(s[i].name))) {
380 dev->irq = s[i].map.irq;
381 dev->base_addr = s[i].map.base_addr;
382 dev->mem_start = s[i].map.mem_start;
383 dev->mem_end = s[i].map.mem_end;
384 return 1;
385 }
386 }
387 return 0;
388}
389
390
391/**
392 * netdev_boot_base - get address from boot time settings
393 * @prefix: prefix for network device
394 * @unit: id for network device
395 *
396 * Check boot time settings for the base address of device.
397 * The found settings are set for the device to be used
398 * later in the device probing.
399 * Returns 0 if no settings found.
400 */
401unsigned long netdev_boot_base(const char *prefix, int unit)
402{
403 const struct netdev_boot_setup *s = dev_boot_setup;
404 char name[IFNAMSIZ];
405 int i;
406
407 sprintf(name, "%s%d", prefix, unit);
408
409 /*
410 * If device already registered then return base of 1
411 * to indicate not to probe for this interface
412 */
413 if (__dev_get_by_name(name))
414 return 1;
415
416 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
417 if (!strcmp(name, s[i].name))
418 return s[i].map.base_addr;
419 return 0;
420}
421
422/*
423 * Saves at boot time configured settings for any netdevice.
424 */
425int __init netdev_boot_setup(char *str)
426{
427 int ints[5];
428 struct ifmap map;
429
430 str = get_options(str, ARRAY_SIZE(ints), ints);
431 if (!str || !*str)
432 return 0;
433
434 /* Save settings */
435 memset(&map, 0, sizeof(map));
436 if (ints[0] > 0)
437 map.irq = ints[1];
438 if (ints[0] > 1)
439 map.base_addr = ints[2];
440 if (ints[0] > 2)
441 map.mem_start = ints[3];
442 if (ints[0] > 3)
443 map.mem_end = ints[4];
444
445 /* Add new entry to the list */
446 return netdev_boot_setup_add(str, &map);
447}
448
449__setup("netdev=", netdev_boot_setup);
450
451/*******************************************************************************
452
453 Device Interface Subroutines
454
455*******************************************************************************/
456
457/**
458 * __dev_get_by_name - find a device by its name
459 * @name: name to find
460 *
461 * Find an interface by name. Must be called under RTNL semaphore
462 * or @dev_base_lock. If the name is found a pointer to the device
463 * is returned. If the name is not found then %NULL is returned. The
464 * reference counters are not incremented so the caller must be
465 * careful with locks.
466 */
467
468struct net_device *__dev_get_by_name(const char *name)
469{
470 struct hlist_node *p;
471
472 hlist_for_each(p, dev_name_hash(name)) {
473 struct net_device *dev
474 = hlist_entry(p, struct net_device, name_hlist);
475 if (!strncmp(dev->name, name, IFNAMSIZ))
476 return dev;
477 }
478 return NULL;
479}
480
481/**
482 * dev_get_by_name - find a device by its name
483 * @name: name to find
484 *
485 * Find an interface by name. This can be called from any
486 * context and does its own locking. The returned handle has
487 * the usage count incremented and the caller must use dev_put() to
488 * release it when it is no longer needed. %NULL is returned if no
489 * matching device is found.
490 */
491
492struct net_device *dev_get_by_name(const char *name)
493{
494 struct net_device *dev;
495
496 read_lock(&dev_base_lock);
497 dev = __dev_get_by_name(name);
498 if (dev)
499 dev_hold(dev);
500 read_unlock(&dev_base_lock);
501 return dev;
502}
503
504/**
505 * __dev_get_by_index - find a device by its ifindex
506 * @ifindex: index of device
507 *
508 * Search for an interface by index. Returns %NULL if the device
509 * is not found or a pointer to the device. The device has not
510 * had its reference counter increased so the caller must be careful
511 * about locking. The caller must hold either the RTNL semaphore
512 * or @dev_base_lock.
513 */
514
515struct net_device *__dev_get_by_index(int ifindex)
516{
517 struct hlist_node *p;
518
519 hlist_for_each(p, dev_index_hash(ifindex)) {
520 struct net_device *dev
521 = hlist_entry(p, struct net_device, index_hlist);
522 if (dev->ifindex == ifindex)
523 return dev;
524 }
525 return NULL;
526}
527
528
529/**
530 * dev_get_by_index - find a device by its ifindex
531 * @ifindex: index of device
532 *
533 * Search for an interface by index. Returns NULL if the device
534 * is not found or a pointer to the device. The device returned has
535 * had a reference added and the pointer is safe until the user calls
536 * dev_put to indicate they have finished with it.
537 */
538
539struct net_device *dev_get_by_index(int ifindex)
540{
541 struct net_device *dev;
542
543 read_lock(&dev_base_lock);
544 dev = __dev_get_by_index(ifindex);
545 if (dev)
546 dev_hold(dev);
547 read_unlock(&dev_base_lock);
548 return dev;
549}
550
551/**
552 * dev_getbyhwaddr - find a device by its hardware address
553 * @type: media type of device
554 * @ha: hardware address
555 *
556 * Search for an interface by MAC address. Returns NULL if the device
557 * is not found or a pointer to the device. The caller must hold the
558 * rtnl semaphore. The returned device has not had its ref count increased
559 * and the caller must therefore be careful about locking
560 *
561 * BUGS:
562 * If the API was consistent this would be __dev_get_by_hwaddr
563 */
564
565struct net_device *dev_getbyhwaddr(unsigned short type, char *ha)
566{
567 struct net_device *dev;
568
569 ASSERT_RTNL();
570
571 for (dev = dev_base; dev; dev = dev->next)
572 if (dev->type == type &&
573 !memcmp(dev->dev_addr, ha, dev->addr_len))
574 break;
575 return dev;
576}
577
Jochen Friedrichcf309e32005-09-22 04:44:55 -0300578EXPORT_SYMBOL(dev_getbyhwaddr);
579
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580struct net_device *dev_getfirstbyhwtype(unsigned short type)
581{
582 struct net_device *dev;
583
584 rtnl_lock();
585 for (dev = dev_base; dev; dev = dev->next) {
586 if (dev->type == type) {
587 dev_hold(dev);
588 break;
589 }
590 }
591 rtnl_unlock();
592 return dev;
593}
594
595EXPORT_SYMBOL(dev_getfirstbyhwtype);
596
597/**
598 * dev_get_by_flags - find any device with given flags
599 * @if_flags: IFF_* values
600 * @mask: bitmask of bits in if_flags to check
601 *
602 * Search for any interface with the given flags. Returns NULL if a device
603 * is not found or a pointer to the device. The device returned has
604 * had a reference added and the pointer is safe until the user calls
605 * dev_put to indicate they have finished with it.
606 */
607
608struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mask)
609{
610 struct net_device *dev;
611
612 read_lock(&dev_base_lock);
613 for (dev = dev_base; dev != NULL; dev = dev->next) {
614 if (((dev->flags ^ if_flags) & mask) == 0) {
615 dev_hold(dev);
616 break;
617 }
618 }
619 read_unlock(&dev_base_lock);
620 return dev;
621}
622
623/**
624 * dev_valid_name - check if name is okay for network device
625 * @name: name string
626 *
627 * Network device names need to be valid file names to
628 * to allow sysfs to work
629 */
Mitch Williamsc2373ee2005-11-09 10:34:45 -0800630int dev_valid_name(const char *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631{
632 return !(*name == '\0'
633 || !strcmp(name, ".")
634 || !strcmp(name, "..")
635 || strchr(name, '/'));
636}
637
638/**
639 * dev_alloc_name - allocate a name for a device
640 * @dev: device
641 * @name: name format string
642 *
643 * Passed a format string - eg "lt%d" it will try and find a suitable
Stephen Hemminger3041a062006-05-26 13:25:24 -0700644 * id. It scans list of devices to build up a free map, then chooses
645 * the first empty slot. The caller must hold the dev_base or rtnl lock
646 * while allocating the name and adding the device in order to avoid
647 * duplicates.
648 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
649 * Returns the number of the unit assigned or a negative errno code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 */
651
652int dev_alloc_name(struct net_device *dev, const char *name)
653{
654 int i = 0;
655 char buf[IFNAMSIZ];
656 const char *p;
657 const int max_netdevices = 8*PAGE_SIZE;
658 long *inuse;
659 struct net_device *d;
660
661 p = strnchr(name, IFNAMSIZ-1, '%');
662 if (p) {
663 /*
664 * Verify the string as this thing may have come from
665 * the user. There must be either one "%d" and no other "%"
666 * characters.
667 */
668 if (p[1] != 'd' || strchr(p + 2, '%'))
669 return -EINVAL;
670
671 /* Use one page as a bit array of possible slots */
672 inuse = (long *) get_zeroed_page(GFP_ATOMIC);
673 if (!inuse)
674 return -ENOMEM;
675
676 for (d = dev_base; d; d = d->next) {
677 if (!sscanf(d->name, name, &i))
678 continue;
679 if (i < 0 || i >= max_netdevices)
680 continue;
681
682 /* avoid cases where sscanf is not exact inverse of printf */
683 snprintf(buf, sizeof(buf), name, i);
684 if (!strncmp(buf, d->name, IFNAMSIZ))
685 set_bit(i, inuse);
686 }
687
688 i = find_first_zero_bit(inuse, max_netdevices);
689 free_page((unsigned long) inuse);
690 }
691
692 snprintf(buf, sizeof(buf), name, i);
693 if (!__dev_get_by_name(buf)) {
694 strlcpy(dev->name, buf, IFNAMSIZ);
695 return i;
696 }
697
698 /* It is possible to run out of possible slots
699 * when the name is long and there isn't enough space left
700 * for the digits, or if all bits are used.
701 */
702 return -ENFILE;
703}
704
705
706/**
707 * dev_change_name - change name of a device
708 * @dev: device
709 * @newname: name (or format string) must be at least IFNAMSIZ
710 *
711 * Change name of a device, can pass format strings "eth%d".
712 * for wildcarding.
713 */
714int dev_change_name(struct net_device *dev, char *newname)
715{
716 int err = 0;
717
718 ASSERT_RTNL();
719
720 if (dev->flags & IFF_UP)
721 return -EBUSY;
722
723 if (!dev_valid_name(newname))
724 return -EINVAL;
725
726 if (strchr(newname, '%')) {
727 err = dev_alloc_name(dev, newname);
728 if (err < 0)
729 return err;
730 strcpy(newname, dev->name);
731 }
732 else if (__dev_get_by_name(newname))
733 return -EEXIST;
734 else
735 strlcpy(dev->name, newname, IFNAMSIZ);
736
737 err = class_device_rename(&dev->class_dev, dev->name);
738 if (!err) {
739 hlist_del(&dev->name_hlist);
740 hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name));
Alan Sternf07d5b92006-05-09 15:23:03 -0700741 raw_notifier_call_chain(&netdev_chain,
Alan Sterne041c682006-03-27 01:16:30 -0800742 NETDEV_CHANGENAME, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 }
744
745 return err;
746}
747
748/**
Stephen Hemminger3041a062006-05-26 13:25:24 -0700749 * netdev_features_change - device changes features
Stephen Hemmingerd8a33ac2005-05-29 14:13:47 -0700750 * @dev: device to cause notification
751 *
752 * Called to indicate a device has changed features.
753 */
754void netdev_features_change(struct net_device *dev)
755{
Alan Sternf07d5b92006-05-09 15:23:03 -0700756 raw_notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev);
Stephen Hemmingerd8a33ac2005-05-29 14:13:47 -0700757}
758EXPORT_SYMBOL(netdev_features_change);
759
760/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 * netdev_state_change - device changes state
762 * @dev: device to cause notification
763 *
764 * Called to indicate a device has changed state. This function calls
765 * the notifier chains for netdev_chain and sends a NEWLINK message
766 * to the routing socket.
767 */
768void netdev_state_change(struct net_device *dev)
769{
770 if (dev->flags & IFF_UP) {
Alan Sternf07d5b92006-05-09 15:23:03 -0700771 raw_notifier_call_chain(&netdev_chain,
Alan Sterne041c682006-03-27 01:16:30 -0800772 NETDEV_CHANGE, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 rtmsg_ifinfo(RTM_NEWLINK, dev, 0);
774 }
775}
776
777/**
778 * dev_load - load a network module
779 * @name: name of interface
780 *
781 * If a network interface is not present and the process has suitable
782 * privileges this function loads the module. If module loading is not
783 * available in this kernel then it becomes a nop.
784 */
785
786void dev_load(const char *name)
787{
788 struct net_device *dev;
789
790 read_lock(&dev_base_lock);
791 dev = __dev_get_by_name(name);
792 read_unlock(&dev_base_lock);
793
794 if (!dev && capable(CAP_SYS_MODULE))
795 request_module("%s", name);
796}
797
798static int default_rebuild_header(struct sk_buff *skb)
799{
800 printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n",
801 skb->dev ? skb->dev->name : "NULL!!!");
802 kfree_skb(skb);
803 return 1;
804}
805
806
807/**
808 * dev_open - prepare an interface for use.
809 * @dev: device to open
810 *
811 * Takes a device from down to up state. The device's private open
812 * function is invoked and then the multicast lists are loaded. Finally
813 * the device is moved into the up state and a %NETDEV_UP message is
814 * sent to the netdev notifier chain.
815 *
816 * Calling this function on an active interface is a nop. On a failure
817 * a negative errno code is returned.
818 */
819int dev_open(struct net_device *dev)
820{
821 int ret = 0;
822
823 /*
824 * Is it already up?
825 */
826
827 if (dev->flags & IFF_UP)
828 return 0;
829
830 /*
831 * Is it even present?
832 */
833 if (!netif_device_present(dev))
834 return -ENODEV;
835
836 /*
837 * Call device private open method
838 */
839 set_bit(__LINK_STATE_START, &dev->state);
840 if (dev->open) {
841 ret = dev->open(dev);
842 if (ret)
843 clear_bit(__LINK_STATE_START, &dev->state);
844 }
845
846 /*
847 * If it went open OK then:
848 */
849
850 if (!ret) {
851 /*
852 * Set the flags.
853 */
854 dev->flags |= IFF_UP;
855
856 /*
857 * Initialize multicasting status
858 */
859 dev_mc_upload(dev);
860
861 /*
862 * Wakeup transmit queue engine
863 */
864 dev_activate(dev);
865
866 /*
867 * ... and announce new interface.
868 */
Alan Sternf07d5b92006-05-09 15:23:03 -0700869 raw_notifier_call_chain(&netdev_chain, NETDEV_UP, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 }
871 return ret;
872}
873
874/**
875 * dev_close - shutdown an interface.
876 * @dev: device to shutdown
877 *
878 * This function moves an active device into down state. A
879 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
880 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
881 * chain.
882 */
883int dev_close(struct net_device *dev)
884{
885 if (!(dev->flags & IFF_UP))
886 return 0;
887
888 /*
889 * Tell people we are going down, so that they can
890 * prepare to death, when device is still operating.
891 */
Alan Sternf07d5b92006-05-09 15:23:03 -0700892 raw_notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893
894 dev_deactivate(dev);
895
896 clear_bit(__LINK_STATE_START, &dev->state);
897
898 /* Synchronize to scheduled poll. We cannot touch poll list,
899 * it can be even on different cpu. So just clear netif_running(),
900 * and wait when poll really will happen. Actually, the best place
901 * for this is inside dev->stop() after device stopped its irq
902 * engine, but this requires more changes in devices. */
903
904 smp_mb__after_clear_bit(); /* Commit netif_running(). */
905 while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) {
906 /* No hurry. */
David S. Miller6192b542005-07-28 12:12:58 -0700907 msleep(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 }
909
910 /*
911 * Call the device specific close. This cannot fail.
912 * Only if device is UP
913 *
914 * We allow it to be called even after a DETACH hot-plug
915 * event.
916 */
917 if (dev->stop)
918 dev->stop(dev);
919
920 /*
921 * Device is now down.
922 */
923
924 dev->flags &= ~IFF_UP;
925
926 /*
927 * Tell people we are down
928 */
Alan Sternf07d5b92006-05-09 15:23:03 -0700929 raw_notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930
931 return 0;
932}
933
934
935/*
936 * Device change register/unregister. These are not inline or static
937 * as we export them to the world.
938 */
939
940/**
941 * register_netdevice_notifier - register a network notifier block
942 * @nb: notifier
943 *
944 * Register a notifier to be called when network device events occur.
945 * The notifier passed is linked into the kernel structures and must
946 * not be reused until it has been unregistered. A negative errno code
947 * is returned on a failure.
948 *
949 * When registered all registration and up events are replayed
950 * to the new notifier to allow device to have a race free
951 * view of the network device list.
952 */
953
954int register_netdevice_notifier(struct notifier_block *nb)
955{
956 struct net_device *dev;
957 int err;
958
959 rtnl_lock();
Alan Sternf07d5b92006-05-09 15:23:03 -0700960 err = raw_notifier_chain_register(&netdev_chain, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 if (!err) {
962 for (dev = dev_base; dev; dev = dev->next) {
963 nb->notifier_call(nb, NETDEV_REGISTER, dev);
964
965 if (dev->flags & IFF_UP)
966 nb->notifier_call(nb, NETDEV_UP, dev);
967 }
968 }
969 rtnl_unlock();
970 return err;
971}
972
973/**
974 * unregister_netdevice_notifier - unregister a network notifier block
975 * @nb: notifier
976 *
977 * Unregister a notifier previously registered by
978 * register_netdevice_notifier(). The notifier is unlinked into the
979 * kernel structures and may then be reused. A negative errno code
980 * is returned on a failure.
981 */
982
983int unregister_netdevice_notifier(struct notifier_block *nb)
984{
Herbert Xu9f514952006-03-25 01:24:25 -0800985 int err;
986
987 rtnl_lock();
Alan Sternf07d5b92006-05-09 15:23:03 -0700988 err = raw_notifier_chain_unregister(&netdev_chain, nb);
Herbert Xu9f514952006-03-25 01:24:25 -0800989 rtnl_unlock();
990 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991}
992
993/**
994 * call_netdevice_notifiers - call all network notifier blocks
995 * @val: value passed unmodified to notifier function
996 * @v: pointer passed unmodified to notifier function
997 *
998 * Call all network notifier blocks. Parameters and return value
Alan Sternf07d5b92006-05-09 15:23:03 -0700999 * are as for raw_notifier_call_chain().
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 */
1001
1002int call_netdevice_notifiers(unsigned long val, void *v)
1003{
Alan Sternf07d5b92006-05-09 15:23:03 -07001004 return raw_notifier_call_chain(&netdev_chain, val, v);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005}
1006
1007/* When > 0 there are consumers of rx skb time stamps */
1008static atomic_t netstamp_needed = ATOMIC_INIT(0);
1009
1010void net_enable_timestamp(void)
1011{
1012 atomic_inc(&netstamp_needed);
1013}
1014
1015void net_disable_timestamp(void)
1016{
1017 atomic_dec(&netstamp_needed);
1018}
1019
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001020void __net_timestamp(struct sk_buff *skb)
1021{
1022 struct timeval tv;
1023
1024 do_gettimeofday(&tv);
1025 skb_set_timestamp(skb, &tv);
1026}
1027EXPORT_SYMBOL(__net_timestamp);
1028
1029static inline void net_timestamp(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030{
1031 if (atomic_read(&netstamp_needed))
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001032 __net_timestamp(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 else {
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001034 skb->tstamp.off_sec = 0;
1035 skb->tstamp.off_usec = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 }
1037}
1038
1039/*
1040 * Support routine. Sends outgoing frames to any network
1041 * taps currently in use.
1042 */
1043
1044void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1045{
1046 struct packet_type *ptype;
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001047
1048 net_timestamp(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049
1050 rcu_read_lock();
1051 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1052 /* Never send packets back to the socket
1053 * they originated from - MvS (miquels@drinkel.ow.org)
1054 */
1055 if ((ptype->dev == dev || !ptype->dev) &&
1056 (ptype->af_packet_priv == NULL ||
1057 (struct sock *)ptype->af_packet_priv != skb->sk)) {
1058 struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC);
1059 if (!skb2)
1060 break;
1061
1062 /* skb->nh should be correctly
1063 set by sender, so that the second statement is
1064 just protection against buggy protocols.
1065 */
1066 skb2->mac.raw = skb2->data;
1067
1068 if (skb2->nh.raw < skb2->data ||
1069 skb2->nh.raw > skb2->tail) {
1070 if (net_ratelimit())
1071 printk(KERN_CRIT "protocol %04x is "
1072 "buggy, dev %s\n",
1073 skb2->protocol, dev->name);
1074 skb2->nh.raw = skb2->data;
1075 }
1076
1077 skb2->h.raw = skb2->nh.raw;
1078 skb2->pkt_type = PACKET_OUTGOING;
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001079 ptype->func(skb2, skb->dev, ptype, skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 }
1081 }
1082 rcu_read_unlock();
1083}
1084
Denis Vlasenko56079432006-03-29 15:57:29 -08001085
1086void __netif_schedule(struct net_device *dev)
1087{
1088 if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) {
1089 unsigned long flags;
1090 struct softnet_data *sd;
1091
1092 local_irq_save(flags);
1093 sd = &__get_cpu_var(softnet_data);
1094 dev->next_sched = sd->output_queue;
1095 sd->output_queue = dev;
1096 raise_softirq_irqoff(NET_TX_SOFTIRQ);
1097 local_irq_restore(flags);
1098 }
1099}
1100EXPORT_SYMBOL(__netif_schedule);
1101
1102void __netif_rx_schedule(struct net_device *dev)
1103{
1104 unsigned long flags;
1105
1106 local_irq_save(flags);
1107 dev_hold(dev);
1108 list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list);
1109 if (dev->quota < 0)
1110 dev->quota += dev->weight;
1111 else
1112 dev->quota = dev->weight;
1113 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
1114 local_irq_restore(flags);
1115}
1116EXPORT_SYMBOL(__netif_rx_schedule);
1117
1118void dev_kfree_skb_any(struct sk_buff *skb)
1119{
1120 if (in_irq() || irqs_disabled())
1121 dev_kfree_skb_irq(skb);
1122 else
1123 dev_kfree_skb(skb);
1124}
1125EXPORT_SYMBOL(dev_kfree_skb_any);
1126
1127
1128/* Hot-plugging. */
1129void netif_device_detach(struct net_device *dev)
1130{
1131 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
1132 netif_running(dev)) {
1133 netif_stop_queue(dev);
1134 }
1135}
1136EXPORT_SYMBOL(netif_device_detach);
1137
1138void netif_device_attach(struct net_device *dev)
1139{
1140 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
1141 netif_running(dev)) {
1142 netif_wake_queue(dev);
1143 __netdev_watchdog_up(dev);
1144 }
1145}
1146EXPORT_SYMBOL(netif_device_attach);
1147
1148
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149/*
1150 * Invalidate hardware checksum when packet is to be mangled, and
1151 * complete checksum manually on outgoing path.
1152 */
1153int skb_checksum_help(struct sk_buff *skb, int inward)
1154{
1155 unsigned int csum;
1156 int ret = 0, offset = skb->h.raw - skb->data;
1157
1158 if (inward) {
1159 skb->ip_summed = CHECKSUM_NONE;
1160 goto out;
1161 }
1162
1163 if (skb_cloned(skb)) {
1164 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
1165 if (ret)
1166 goto out;
1167 }
1168
Kris Katterjohn09a62662006-01-08 22:24:28 -08001169 BUG_ON(offset > (int)skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170 csum = skb_checksum(skb, offset, skb->len-offset, 0);
1171
1172 offset = skb->tail - skb->h.raw;
Kris Katterjohn09a62662006-01-08 22:24:28 -08001173 BUG_ON(offset <= 0);
1174 BUG_ON(skb->csum + 2 > offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175
1176 *(u16*)(skb->h.raw + skb->csum) = csum_fold(csum);
1177 skb->ip_summed = CHECKSUM_NONE;
1178out:
1179 return ret;
1180}
1181
Herbert Xufb286bb2005-11-10 13:01:24 -08001182/* Take action when hardware reception checksum errors are detected. */
1183#ifdef CONFIG_BUG
1184void netdev_rx_csum_fault(struct net_device *dev)
1185{
1186 if (net_ratelimit()) {
Stephen Hemminger246a4212005-12-08 15:21:39 -08001187 printk(KERN_ERR "%s: hw csum failure.\n",
1188 dev ? dev->name : "<unknown>");
Herbert Xufb286bb2005-11-10 13:01:24 -08001189 dump_stack();
1190 }
1191}
1192EXPORT_SYMBOL(netdev_rx_csum_fault);
1193#endif
1194
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195#ifdef CONFIG_HIGHMEM
1196/* Actually, we should eliminate this check as soon as we know, that:
1197 * 1. IOMMU is present and allows to map all the memory.
1198 * 2. No high memory really exists on this machine.
1199 */
1200
1201static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
1202{
1203 int i;
1204
1205 if (dev->features & NETIF_F_HIGHDMA)
1206 return 0;
1207
1208 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
1209 if (PageHighMem(skb_shinfo(skb)->frags[i].page))
1210 return 1;
1211
1212 return 0;
1213}
1214#else
1215#define illegal_highdma(dev, skb) (0)
1216#endif
1217
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218/* Keep head the same: replace data */
Al Virodd0fc662005-10-07 07:46:04 +01001219int __skb_linearize(struct sk_buff *skb, gfp_t gfp_mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220{
1221 unsigned int size;
1222 u8 *data;
1223 long offset;
1224 struct skb_shared_info *ninfo;
1225 int headerlen = skb->data - skb->head;
1226 int expand = (skb->tail + skb->data_len) - skb->end;
1227
1228 if (skb_shared(skb))
1229 BUG();
1230
1231 if (expand <= 0)
1232 expand = 0;
1233
1234 size = skb->end - skb->head + expand;
1235 size = SKB_DATA_ALIGN(size);
1236 data = kmalloc(size + sizeof(struct skb_shared_info), gfp_mask);
1237 if (!data)
1238 return -ENOMEM;
1239
1240 /* Copy entire thing */
1241 if (skb_copy_bits(skb, -headerlen, data, headerlen + skb->len))
1242 BUG();
1243
1244 /* Set up shinfo */
1245 ninfo = (struct skb_shared_info*)(data + size);
1246 atomic_set(&ninfo->dataref, 1);
1247 ninfo->tso_size = skb_shinfo(skb)->tso_size;
1248 ninfo->tso_segs = skb_shinfo(skb)->tso_segs;
1249 ninfo->nr_frags = 0;
1250 ninfo->frag_list = NULL;
1251
1252 /* Offset between the two in bytes */
1253 offset = data - skb->head;
1254
1255 /* Free old data. */
1256 skb_release_data(skb);
1257
1258 skb->head = data;
1259 skb->end = data + size;
1260
1261 /* Set up new pointers */
1262 skb->h.raw += offset;
1263 skb->nh.raw += offset;
1264 skb->mac.raw += offset;
1265 skb->tail += offset;
1266 skb->data += offset;
1267
1268 /* We are no longer a clone, even if we were. */
1269 skb->cloned = 0;
1270
1271 skb->tail += skb->data_len;
1272 skb->data_len = 0;
1273 return 0;
1274}
1275
1276#define HARD_TX_LOCK(dev, cpu) { \
1277 if ((dev->features & NETIF_F_LLTX) == 0) { \
1278 spin_lock(&dev->xmit_lock); \
1279 dev->xmit_lock_owner = cpu; \
1280 } \
1281}
1282
1283#define HARD_TX_UNLOCK(dev) { \
1284 if ((dev->features & NETIF_F_LLTX) == 0) { \
1285 dev->xmit_lock_owner = -1; \
1286 spin_unlock(&dev->xmit_lock); \
1287 } \
1288}
1289
1290/**
1291 * dev_queue_xmit - transmit a buffer
1292 * @skb: buffer to transmit
1293 *
1294 * Queue a buffer for transmission to a network device. The caller must
1295 * have set the device and priority and built the buffer before calling
1296 * this function. The function can be called from an interrupt.
1297 *
1298 * A negative errno code is returned on a failure. A success does not
1299 * guarantee the frame will be transmitted as it may be dropped due
1300 * to congestion or traffic shaping.
Ben Greearaf191362005-04-24 20:12:36 -07001301 *
1302 * -----------------------------------------------------------------------------------
1303 * I notice this method can also return errors from the queue disciplines,
1304 * including NET_XMIT_DROP, which is a positive value. So, errors can also
1305 * be positive.
1306 *
1307 * Regardless of the return value, the skb is consumed, so it is currently
1308 * difficult to retry a send to this method. (You can bump the ref count
1309 * before sending to hold a reference for retry if you are careful.)
1310 *
1311 * When calling this method, interrupts MUST be enabled. This is because
1312 * the BH enable code must have IRQs enabled so that it will not deadlock.
1313 * --BLG
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 */
1315
1316int dev_queue_xmit(struct sk_buff *skb)
1317{
1318 struct net_device *dev = skb->dev;
1319 struct Qdisc *q;
1320 int rc = -ENOMEM;
1321
1322 if (skb_shinfo(skb)->frag_list &&
1323 !(dev->features & NETIF_F_FRAGLIST) &&
1324 __skb_linearize(skb, GFP_ATOMIC))
1325 goto out_kfree_skb;
1326
1327 /* Fragmented skb is linearized if device does not support SG,
1328 * or if at least one of fragments is in highmem and device
1329 * does not support DMA from it.
1330 */
1331 if (skb_shinfo(skb)->nr_frags &&
1332 (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) &&
1333 __skb_linearize(skb, GFP_ATOMIC))
1334 goto out_kfree_skb;
1335
1336 /* If packet is not checksummed and device does not support
1337 * checksumming for this protocol, complete checksumming here.
1338 */
1339 if (skb->ip_summed == CHECKSUM_HW &&
1340 (!(dev->features & (NETIF_F_HW_CSUM | NETIF_F_NO_CSUM)) &&
1341 (!(dev->features & NETIF_F_IP_CSUM) ||
1342 skb->protocol != htons(ETH_P_IP))))
1343 if (skb_checksum_help(skb, 0))
1344 goto out_kfree_skb;
1345
Eric Dumazet2d7ceec2005-09-27 15:22:58 -07001346 spin_lock_prefetch(&dev->queue_lock);
1347
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 /* Disable soft irqs for various locks below. Also
1349 * stops preemption for RCU.
1350 */
1351 local_bh_disable();
1352
1353 /* Updates of qdisc are serialized by queue_lock.
1354 * The struct Qdisc which is pointed to by qdisc is now a
1355 * rcu structure - it may be accessed without acquiring
1356 * a lock (but the structure may be stale.) The freeing of the
1357 * qdisc will be deferred until it's known that there are no
1358 * more references to it.
1359 *
1360 * If the qdisc has an enqueue function, we still need to
1361 * hold the queue_lock before calling it, since queue_lock
1362 * also serializes access to the device queue.
1363 */
1364
1365 q = rcu_dereference(dev->qdisc);
1366#ifdef CONFIG_NET_CLS_ACT
1367 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS);
1368#endif
1369 if (q->enqueue) {
1370 /* Grab device queue */
1371 spin_lock(&dev->queue_lock);
1372
1373 rc = q->enqueue(skb, q);
1374
1375 qdisc_run(dev);
1376
1377 spin_unlock(&dev->queue_lock);
1378 rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc;
1379 goto out;
1380 }
1381
1382 /* The device has no queue. Common case for software devices:
1383 loopback, all the sorts of tunnels...
1384
1385 Really, it is unlikely that xmit_lock protection is necessary here.
1386 (f.e. loopback and IP tunnels are clean ignoring statistics
1387 counters.)
1388 However, it is possible, that they rely on protection
1389 made by us here.
1390
1391 Check this and shot the lock. It is not prone from deadlocks.
1392 Either shot noqueue qdisc, it is even simpler 8)
1393 */
1394 if (dev->flags & IFF_UP) {
1395 int cpu = smp_processor_id(); /* ok because BHs are off */
1396
1397 if (dev->xmit_lock_owner != cpu) {
1398
1399 HARD_TX_LOCK(dev, cpu);
1400
1401 if (!netif_queue_stopped(dev)) {
1402 if (netdev_nit)
1403 dev_queue_xmit_nit(skb, dev);
1404
1405 rc = 0;
1406 if (!dev->hard_start_xmit(skb, dev)) {
1407 HARD_TX_UNLOCK(dev);
1408 goto out;
1409 }
1410 }
1411 HARD_TX_UNLOCK(dev);
1412 if (net_ratelimit())
1413 printk(KERN_CRIT "Virtual device %s asks to "
1414 "queue packet!\n", dev->name);
1415 } else {
1416 /* Recursion is detected! It is possible,
1417 * unfortunately */
1418 if (net_ratelimit())
1419 printk(KERN_CRIT "Dead loop on virtual device "
1420 "%s, fix it urgently!\n", dev->name);
1421 }
1422 }
1423
1424 rc = -ENETDOWN;
1425 local_bh_enable();
1426
1427out_kfree_skb:
1428 kfree_skb(skb);
1429 return rc;
1430out:
1431 local_bh_enable();
1432 return rc;
1433}
1434
1435
1436/*=======================================================================
1437 Receiver routines
1438 =======================================================================*/
1439
Stephen Hemminger51b0bde2005-06-23 20:14:40 -07001440int netdev_max_backlog = 1000;
1441int netdev_budget = 300;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442int weight_p = 64; /* old backlog weight */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443
1444DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, };
1445
1446
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447/**
1448 * netif_rx - post buffer to the network code
1449 * @skb: buffer to post
1450 *
1451 * This function receives a packet from a device driver and queues it for
1452 * the upper (protocol) levels to process. It always succeeds. The buffer
1453 * may be dropped during processing for congestion control or by the
1454 * protocol layers.
1455 *
1456 * return values:
1457 * NET_RX_SUCCESS (no congestion)
1458 * NET_RX_CN_LOW (low congestion)
1459 * NET_RX_CN_MOD (moderate congestion)
1460 * NET_RX_CN_HIGH (high congestion)
1461 * NET_RX_DROP (packet was dropped)
1462 *
1463 */
1464
1465int netif_rx(struct sk_buff *skb)
1466{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 struct softnet_data *queue;
1468 unsigned long flags;
1469
1470 /* if netpoll wants it, pretend we never saw it */
1471 if (netpoll_rx(skb))
1472 return NET_RX_DROP;
1473
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001474 if (!skb->tstamp.off_sec)
1475 net_timestamp(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476
1477 /*
1478 * The code is rearranged so that the path is the most
1479 * short when CPU is congested, but is still operating.
1480 */
1481 local_irq_save(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482 queue = &__get_cpu_var(softnet_data);
1483
1484 __get_cpu_var(netdev_rx_stat).total++;
1485 if (queue->input_pkt_queue.qlen <= netdev_max_backlog) {
1486 if (queue->input_pkt_queue.qlen) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487enqueue:
1488 dev_hold(skb->dev);
1489 __skb_queue_tail(&queue->input_pkt_queue, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 local_irq_restore(flags);
Stephen Hemminger34008d82005-06-23 20:10:00 -07001491 return NET_RX_SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492 }
1493
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494 netif_rx_schedule(&queue->backlog_dev);
1495 goto enqueue;
1496 }
1497
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 __get_cpu_var(netdev_rx_stat).dropped++;
1499 local_irq_restore(flags);
1500
1501 kfree_skb(skb);
1502 return NET_RX_DROP;
1503}
1504
1505int netif_rx_ni(struct sk_buff *skb)
1506{
1507 int err;
1508
1509 preempt_disable();
1510 err = netif_rx(skb);
1511 if (local_softirq_pending())
1512 do_softirq();
1513 preempt_enable();
1514
1515 return err;
1516}
1517
1518EXPORT_SYMBOL(netif_rx_ni);
1519
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001520static inline struct net_device *skb_bond(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521{
1522 struct net_device *dev = skb->dev;
1523
Jay Vosburgh8f903c72006-02-21 16:36:44 -08001524 if (dev->master) {
1525 /*
1526 * On bonding slaves other than the currently active
1527 * slave, suppress duplicates except for 802.3ad
1528 * ETH_P_SLOW and alb non-mcast/bcast.
1529 */
1530 if (dev->priv_flags & IFF_SLAVE_INACTIVE) {
1531 if (dev->master->priv_flags & IFF_MASTER_ALB) {
1532 if (skb->pkt_type != PACKET_BROADCAST &&
1533 skb->pkt_type != PACKET_MULTICAST)
1534 goto keep;
1535 }
1536
1537 if (dev->master->priv_flags & IFF_MASTER_8023AD &&
1538 skb->protocol == __constant_htons(ETH_P_SLOW))
1539 goto keep;
1540
1541 kfree_skb(skb);
1542 return NULL;
1543 }
1544keep:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 skb->dev = dev->master;
Jay Vosburgh8f903c72006-02-21 16:36:44 -08001546 }
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001547
1548 return dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549}
1550
1551static void net_tx_action(struct softirq_action *h)
1552{
1553 struct softnet_data *sd = &__get_cpu_var(softnet_data);
1554
1555 if (sd->completion_queue) {
1556 struct sk_buff *clist;
1557
1558 local_irq_disable();
1559 clist = sd->completion_queue;
1560 sd->completion_queue = NULL;
1561 local_irq_enable();
1562
1563 while (clist) {
1564 struct sk_buff *skb = clist;
1565 clist = clist->next;
1566
1567 BUG_TRAP(!atomic_read(&skb->users));
1568 __kfree_skb(skb);
1569 }
1570 }
1571
1572 if (sd->output_queue) {
1573 struct net_device *head;
1574
1575 local_irq_disable();
1576 head = sd->output_queue;
1577 sd->output_queue = NULL;
1578 local_irq_enable();
1579
1580 while (head) {
1581 struct net_device *dev = head;
1582 head = head->next_sched;
1583
1584 smp_mb__before_clear_bit();
1585 clear_bit(__LINK_STATE_SCHED, &dev->state);
1586
1587 if (spin_trylock(&dev->queue_lock)) {
1588 qdisc_run(dev);
1589 spin_unlock(&dev->queue_lock);
1590 } else {
1591 netif_schedule(dev);
1592 }
1593 }
1594 }
1595}
1596
1597static __inline__ int deliver_skb(struct sk_buff *skb,
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001598 struct packet_type *pt_prev,
1599 struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600{
1601 atomic_inc(&skb->users);
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001602 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603}
1604
1605#if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE)
1606int (*br_handle_frame_hook)(struct net_bridge_port *p, struct sk_buff **pskb);
1607struct net_bridge;
1608struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
1609 unsigned char *addr);
1610void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
1611
1612static __inline__ int handle_bridge(struct sk_buff **pskb,
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001613 struct packet_type **pt_prev, int *ret,
1614 struct net_device *orig_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615{
1616 struct net_bridge_port *port;
1617
1618 if ((*pskb)->pkt_type == PACKET_LOOPBACK ||
1619 (port = rcu_dereference((*pskb)->dev->br_port)) == NULL)
1620 return 0;
1621
1622 if (*pt_prev) {
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001623 *ret = deliver_skb(*pskb, *pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 *pt_prev = NULL;
1625 }
1626
1627 return br_handle_frame_hook(port, pskb);
1628}
1629#else
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001630#define handle_bridge(skb, pt_prev, ret, orig_dev) (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631#endif
1632
1633#ifdef CONFIG_NET_CLS_ACT
1634/* TODO: Maybe we should just force sch_ingress to be compiled in
1635 * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions
1636 * a compare and 2 stores extra right now if we dont have it on
1637 * but have CONFIG_NET_CLS_ACT
1638 * NOTE: This doesnt stop any functionality; if you dont have
1639 * the ingress scheduler, you just cant add policies on ingress.
1640 *
1641 */
1642static int ing_filter(struct sk_buff *skb)
1643{
1644 struct Qdisc *q;
1645 struct net_device *dev = skb->dev;
1646 int result = TC_ACT_OK;
1647
1648 if (dev->qdisc_ingress) {
1649 __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd);
1650 if (MAX_RED_LOOP < ttl++) {
1651 printk("Redir loop detected Dropping packet (%s->%s)\n",
David S. Miller86e65da2005-08-09 19:36:29 -07001652 skb->input_dev->name, skb->dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653 return TC_ACT_SHOT;
1654 }
1655
1656 skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl);
1657
1658 skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS);
David S. Miller86e65da2005-08-09 19:36:29 -07001659
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660 spin_lock(&dev->ingress_lock);
1661 if ((q = dev->qdisc_ingress) != NULL)
1662 result = q->enqueue(skb, q);
1663 spin_unlock(&dev->ingress_lock);
1664
1665 }
1666
1667 return result;
1668}
1669#endif
1670
1671int netif_receive_skb(struct sk_buff *skb)
1672{
1673 struct packet_type *ptype, *pt_prev;
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001674 struct net_device *orig_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 int ret = NET_RX_DROP;
1676 unsigned short type;
1677
1678 /* if we've gotten here through NAPI, check netpoll */
1679 if (skb->dev->poll && netpoll_rx(skb))
1680 return NET_RX_DROP;
1681
Patrick McHardya61bbcf2005-08-14 17:24:31 -07001682 if (!skb->tstamp.off_sec)
1683 net_timestamp(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001684
David S. Miller86e65da2005-08-09 19:36:29 -07001685 if (!skb->input_dev)
1686 skb->input_dev = skb->dev;
1687
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001688 orig_dev = skb_bond(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689
Jay Vosburgh8f903c72006-02-21 16:36:44 -08001690 if (!orig_dev)
1691 return NET_RX_DROP;
1692
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 __get_cpu_var(netdev_rx_stat).total++;
1694
1695 skb->h.raw = skb->nh.raw = skb->data;
1696 skb->mac_len = skb->nh.raw - skb->mac.raw;
1697
1698 pt_prev = NULL;
1699
1700 rcu_read_lock();
1701
1702#ifdef CONFIG_NET_CLS_ACT
1703 if (skb->tc_verd & TC_NCLS) {
1704 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
1705 goto ncls;
1706 }
1707#endif
1708
1709 list_for_each_entry_rcu(ptype, &ptype_all, list) {
1710 if (!ptype->dev || ptype->dev == skb->dev) {
1711 if (pt_prev)
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001712 ret = deliver_skb(skb, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 pt_prev = ptype;
1714 }
1715 }
1716
1717#ifdef CONFIG_NET_CLS_ACT
1718 if (pt_prev) {
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001719 ret = deliver_skb(skb, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001720 pt_prev = NULL; /* noone else should process this after*/
1721 } else {
1722 skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd);
1723 }
1724
1725 ret = ing_filter(skb);
1726
1727 if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) {
1728 kfree_skb(skb);
1729 goto out;
1730 }
1731
1732 skb->tc_verd = 0;
1733ncls:
1734#endif
1735
1736 handle_diverter(skb);
1737
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001738 if (handle_bridge(&skb, &pt_prev, &ret, orig_dev))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739 goto out;
1740
1741 type = skb->protocol;
1742 list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) {
1743 if (ptype->type == type &&
1744 (!ptype->dev || ptype->dev == skb->dev)) {
1745 if (pt_prev)
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001746 ret = deliver_skb(skb, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747 pt_prev = ptype;
1748 }
1749 }
1750
1751 if (pt_prev) {
David S. Millerf2ccd8f2005-08-09 19:34:12 -07001752 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001753 } else {
1754 kfree_skb(skb);
1755 /* Jamal, now you will not able to escape explaining
1756 * me how you were going to use this. :-)
1757 */
1758 ret = NET_RX_DROP;
1759 }
1760
1761out:
1762 rcu_read_unlock();
1763 return ret;
1764}
1765
1766static int process_backlog(struct net_device *backlog_dev, int *budget)
1767{
1768 int work = 0;
1769 int quota = min(backlog_dev->quota, *budget);
1770 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1771 unsigned long start_time = jiffies;
1772
Stephen Hemmingere3876602005-06-08 14:56:01 -07001773 backlog_dev->weight = weight_p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774 for (;;) {
1775 struct sk_buff *skb;
1776 struct net_device *dev;
1777
1778 local_irq_disable();
1779 skb = __skb_dequeue(&queue->input_pkt_queue);
1780 if (!skb)
1781 goto job_done;
1782 local_irq_enable();
1783
1784 dev = skb->dev;
1785
1786 netif_receive_skb(skb);
1787
1788 dev_put(dev);
1789
1790 work++;
1791
1792 if (work >= quota || jiffies - start_time > 1)
1793 break;
1794
1795 }
1796
1797 backlog_dev->quota -= work;
1798 *budget -= work;
1799 return -1;
1800
1801job_done:
1802 backlog_dev->quota -= work;
1803 *budget -= work;
1804
1805 list_del(&backlog_dev->poll_list);
1806 smp_mb__before_clear_bit();
1807 netif_poll_enable(backlog_dev);
1808
Linus Torvalds1da177e2005-04-16 15:20:36 -07001809 local_irq_enable();
1810 return 0;
1811}
1812
1813static void net_rx_action(struct softirq_action *h)
1814{
1815 struct softnet_data *queue = &__get_cpu_var(softnet_data);
1816 unsigned long start_time = jiffies;
Stephen Hemminger51b0bde2005-06-23 20:14:40 -07001817 int budget = netdev_budget;
Matt Mackall53fb95d2005-08-11 19:27:43 -07001818 void *have;
1819
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820 local_irq_disable();
1821
1822 while (!list_empty(&queue->poll_list)) {
1823 struct net_device *dev;
1824
1825 if (budget <= 0 || jiffies - start_time > 1)
1826 goto softnet_break;
1827
1828 local_irq_enable();
1829
1830 dev = list_entry(queue->poll_list.next,
1831 struct net_device, poll_list);
Matt Mackall53fb95d2005-08-11 19:27:43 -07001832 have = netpoll_poll_lock(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833
1834 if (dev->quota <= 0 || dev->poll(dev, &budget)) {
Matt Mackall53fb95d2005-08-11 19:27:43 -07001835 netpoll_poll_unlock(have);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836 local_irq_disable();
Stephen Hemminger8aca8a22006-03-20 22:26:39 -08001837 list_move_tail(&dev->poll_list, &queue->poll_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838 if (dev->quota < 0)
1839 dev->quota += dev->weight;
1840 else
1841 dev->quota = dev->weight;
1842 } else {
Matt Mackall53fb95d2005-08-11 19:27:43 -07001843 netpoll_poll_unlock(have);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844 dev_put(dev);
1845 local_irq_disable();
1846 }
1847 }
1848out:
1849 local_irq_enable();
1850 return;
1851
1852softnet_break:
1853 __get_cpu_var(netdev_rx_stat).time_squeeze++;
1854 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
1855 goto out;
1856}
1857
1858static gifconf_func_t * gifconf_list [NPROTO];
1859
1860/**
1861 * register_gifconf - register a SIOCGIF handler
1862 * @family: Address family
1863 * @gifconf: Function handler
1864 *
1865 * Register protocol dependent address dumping routines. The handler
1866 * that is passed must not be freed or reused until it has been replaced
1867 * by another handler.
1868 */
1869int register_gifconf(unsigned int family, gifconf_func_t * gifconf)
1870{
1871 if (family >= NPROTO)
1872 return -EINVAL;
1873 gifconf_list[family] = gifconf;
1874 return 0;
1875}
1876
1877
1878/*
1879 * Map an interface index to its name (SIOCGIFNAME)
1880 */
1881
1882/*
1883 * We need this ioctl for efficient implementation of the
1884 * if_indextoname() function required by the IPv6 API. Without
1885 * it, we would have to search all the interfaces to find a
1886 * match. --pb
1887 */
1888
1889static int dev_ifname(struct ifreq __user *arg)
1890{
1891 struct net_device *dev;
1892 struct ifreq ifr;
1893
1894 /*
1895 * Fetch the caller's info block.
1896 */
1897
1898 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
1899 return -EFAULT;
1900
1901 read_lock(&dev_base_lock);
1902 dev = __dev_get_by_index(ifr.ifr_ifindex);
1903 if (!dev) {
1904 read_unlock(&dev_base_lock);
1905 return -ENODEV;
1906 }
1907
1908 strcpy(ifr.ifr_name, dev->name);
1909 read_unlock(&dev_base_lock);
1910
1911 if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
1912 return -EFAULT;
1913 return 0;
1914}
1915
1916/*
1917 * Perform a SIOCGIFCONF call. This structure will change
1918 * size eventually, and there is nothing I can do about it.
1919 * Thus we will need a 'compatibility mode'.
1920 */
1921
1922static int dev_ifconf(char __user *arg)
1923{
1924 struct ifconf ifc;
1925 struct net_device *dev;
1926 char __user *pos;
1927 int len;
1928 int total;
1929 int i;
1930
1931 /*
1932 * Fetch the caller's info block.
1933 */
1934
1935 if (copy_from_user(&ifc, arg, sizeof(struct ifconf)))
1936 return -EFAULT;
1937
1938 pos = ifc.ifc_buf;
1939 len = ifc.ifc_len;
1940
1941 /*
1942 * Loop over the interfaces, and write an info block for each.
1943 */
1944
1945 total = 0;
1946 for (dev = dev_base; dev; dev = dev->next) {
1947 for (i = 0; i < NPROTO; i++) {
1948 if (gifconf_list[i]) {
1949 int done;
1950 if (!pos)
1951 done = gifconf_list[i](dev, NULL, 0);
1952 else
1953 done = gifconf_list[i](dev, pos + total,
1954 len - total);
1955 if (done < 0)
1956 return -EFAULT;
1957 total += done;
1958 }
1959 }
1960 }
1961
1962 /*
1963 * All done. Write the updated control block back to the caller.
1964 */
1965 ifc.ifc_len = total;
1966
1967 /*
1968 * Both BSD and Solaris return 0 here, so we do too.
1969 */
1970 return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0;
1971}
1972
1973#ifdef CONFIG_PROC_FS
1974/*
1975 * This is invoked by the /proc filesystem handler to display a device
1976 * in detail.
1977 */
1978static __inline__ struct net_device *dev_get_idx(loff_t pos)
1979{
1980 struct net_device *dev;
1981 loff_t i;
1982
1983 for (i = 0, dev = dev_base; dev && i < pos; ++i, dev = dev->next);
1984
1985 return i == pos ? dev : NULL;
1986}
1987
1988void *dev_seq_start(struct seq_file *seq, loff_t *pos)
1989{
1990 read_lock(&dev_base_lock);
1991 return *pos ? dev_get_idx(*pos - 1) : SEQ_START_TOKEN;
1992}
1993
1994void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1995{
1996 ++*pos;
1997 return v == SEQ_START_TOKEN ? dev_base : ((struct net_device *)v)->next;
1998}
1999
2000void dev_seq_stop(struct seq_file *seq, void *v)
2001{
2002 read_unlock(&dev_base_lock);
2003}
2004
2005static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
2006{
2007 if (dev->get_stats) {
2008 struct net_device_stats *stats = dev->get_stats(dev);
2009
2010 seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu "
2011 "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n",
2012 dev->name, stats->rx_bytes, stats->rx_packets,
2013 stats->rx_errors,
2014 stats->rx_dropped + stats->rx_missed_errors,
2015 stats->rx_fifo_errors,
2016 stats->rx_length_errors + stats->rx_over_errors +
2017 stats->rx_crc_errors + stats->rx_frame_errors,
2018 stats->rx_compressed, stats->multicast,
2019 stats->tx_bytes, stats->tx_packets,
2020 stats->tx_errors, stats->tx_dropped,
2021 stats->tx_fifo_errors, stats->collisions,
2022 stats->tx_carrier_errors +
2023 stats->tx_aborted_errors +
2024 stats->tx_window_errors +
2025 stats->tx_heartbeat_errors,
2026 stats->tx_compressed);
2027 } else
2028 seq_printf(seq, "%6s: No statistics available.\n", dev->name);
2029}
2030
2031/*
2032 * Called from the PROCfs module. This now uses the new arbitrary sized
2033 * /proc/net interface to create /proc/net/dev
2034 */
2035static int dev_seq_show(struct seq_file *seq, void *v)
2036{
2037 if (v == SEQ_START_TOKEN)
2038 seq_puts(seq, "Inter-| Receive "
2039 " | Transmit\n"
2040 " face |bytes packets errs drop fifo frame "
2041 "compressed multicast|bytes packets errs "
2042 "drop fifo colls carrier compressed\n");
2043 else
2044 dev_seq_printf_stats(seq, v);
2045 return 0;
2046}
2047
2048static struct netif_rx_stats *softnet_get_online(loff_t *pos)
2049{
2050 struct netif_rx_stats *rc = NULL;
2051
2052 while (*pos < NR_CPUS)
2053 if (cpu_online(*pos)) {
2054 rc = &per_cpu(netdev_rx_stat, *pos);
2055 break;
2056 } else
2057 ++*pos;
2058 return rc;
2059}
2060
2061static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
2062{
2063 return softnet_get_online(pos);
2064}
2065
2066static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2067{
2068 ++*pos;
2069 return softnet_get_online(pos);
2070}
2071
2072static void softnet_seq_stop(struct seq_file *seq, void *v)
2073{
2074}
2075
2076static int softnet_seq_show(struct seq_file *seq, void *v)
2077{
2078 struct netif_rx_stats *s = v;
2079
2080 seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
Stephen Hemminger31aa02c2005-06-23 20:12:48 -07002081 s->total, s->dropped, s->time_squeeze, 0,
Stephen Hemmingerc1ebcdb2005-06-23 20:08:59 -07002082 0, 0, 0, 0, /* was fastroute */
2083 s->cpu_collision );
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084 return 0;
2085}
2086
2087static struct seq_operations dev_seq_ops = {
2088 .start = dev_seq_start,
2089 .next = dev_seq_next,
2090 .stop = dev_seq_stop,
2091 .show = dev_seq_show,
2092};
2093
2094static int dev_seq_open(struct inode *inode, struct file *file)
2095{
2096 return seq_open(file, &dev_seq_ops);
2097}
2098
2099static struct file_operations dev_seq_fops = {
2100 .owner = THIS_MODULE,
2101 .open = dev_seq_open,
2102 .read = seq_read,
2103 .llseek = seq_lseek,
2104 .release = seq_release,
2105};
2106
2107static struct seq_operations softnet_seq_ops = {
2108 .start = softnet_seq_start,
2109 .next = softnet_seq_next,
2110 .stop = softnet_seq_stop,
2111 .show = softnet_seq_show,
2112};
2113
2114static int softnet_seq_open(struct inode *inode, struct file *file)
2115{
2116 return seq_open(file, &softnet_seq_ops);
2117}
2118
2119static struct file_operations softnet_seq_fops = {
2120 .owner = THIS_MODULE,
2121 .open = softnet_seq_open,
2122 .read = seq_read,
2123 .llseek = seq_lseek,
2124 .release = seq_release,
2125};
2126
Adrian Bunkd86b5e02006-01-21 00:46:55 +01002127#ifdef CONFIG_WIRELESS_EXT
Linus Torvalds1da177e2005-04-16 15:20:36 -07002128extern int wireless_proc_init(void);
2129#else
2130#define wireless_proc_init() 0
2131#endif
2132
2133static int __init dev_proc_init(void)
2134{
2135 int rc = -ENOMEM;
2136
2137 if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops))
2138 goto out;
2139 if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops))
2140 goto out_dev;
2141 if (wireless_proc_init())
2142 goto out_softnet;
2143 rc = 0;
2144out:
2145 return rc;
2146out_softnet:
2147 proc_net_remove("softnet_stat");
2148out_dev:
2149 proc_net_remove("dev");
2150 goto out;
2151}
2152#else
2153#define dev_proc_init() 0
2154#endif /* CONFIG_PROC_FS */
2155
2156
2157/**
2158 * netdev_set_master - set up master/slave pair
2159 * @slave: slave device
2160 * @master: new master device
2161 *
2162 * Changes the master device of the slave. Pass %NULL to break the
2163 * bonding. The caller must hold the RTNL semaphore. On a failure
2164 * a negative errno code is returned. On success the reference counts
2165 * are adjusted, %RTM_NEWLINK is sent to the routing socket and the
2166 * function returns zero.
2167 */
2168int netdev_set_master(struct net_device *slave, struct net_device *master)
2169{
2170 struct net_device *old = slave->master;
2171
2172 ASSERT_RTNL();
2173
2174 if (master) {
2175 if (old)
2176 return -EBUSY;
2177 dev_hold(master);
2178 }
2179
2180 slave->master = master;
2181
2182 synchronize_net();
2183
2184 if (old)
2185 dev_put(old);
2186
2187 if (master)
2188 slave->flags |= IFF_SLAVE;
2189 else
2190 slave->flags &= ~IFF_SLAVE;
2191
2192 rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE);
2193 return 0;
2194}
2195
2196/**
2197 * dev_set_promiscuity - update promiscuity count on a device
2198 * @dev: device
2199 * @inc: modifier
2200 *
Stephen Hemminger3041a062006-05-26 13:25:24 -07002201 * Add or remove promiscuity from a device. While the count in the device
Linus Torvalds1da177e2005-04-16 15:20:36 -07002202 * remains above zero the interface remains promiscuous. Once it hits zero
2203 * the device reverts back to normal filtering operation. A negative inc
2204 * value is used to drop promiscuity on the device.
2205 */
2206void dev_set_promiscuity(struct net_device *dev, int inc)
2207{
2208 unsigned short old_flags = dev->flags;
2209
Linus Torvalds1da177e2005-04-16 15:20:36 -07002210 if ((dev->promiscuity += inc) == 0)
2211 dev->flags &= ~IFF_PROMISC;
David Chau52609c02005-07-05 15:11:06 -07002212 else
2213 dev->flags |= IFF_PROMISC;
2214 if (dev->flags != old_flags) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002215 dev_mc_upload(dev);
2216 printk(KERN_INFO "device %s %s promiscuous mode\n",
2217 dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
2218 "left");
Steve Grubb5bdb9882005-12-03 08:39:35 -05002219 audit_log(current->audit_context, GFP_ATOMIC,
2220 AUDIT_ANOM_PROMISCUOUS,
2221 "dev=%s prom=%d old_prom=%d auid=%u",
2222 dev->name, (dev->flags & IFF_PROMISC),
2223 (old_flags & IFF_PROMISC),
2224 audit_get_loginuid(current->audit_context));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002225 }
2226}
2227
2228/**
2229 * dev_set_allmulti - update allmulti count on a device
2230 * @dev: device
2231 * @inc: modifier
2232 *
2233 * Add or remove reception of all multicast frames to a device. While the
2234 * count in the device remains above zero the interface remains listening
2235 * to all interfaces. Once it hits zero the device reverts back to normal
2236 * filtering operation. A negative @inc value is used to drop the counter
2237 * when releasing a resource needing all multicasts.
2238 */
2239
2240void dev_set_allmulti(struct net_device *dev, int inc)
2241{
2242 unsigned short old_flags = dev->flags;
2243
2244 dev->flags |= IFF_ALLMULTI;
2245 if ((dev->allmulti += inc) == 0)
2246 dev->flags &= ~IFF_ALLMULTI;
2247 if (dev->flags ^ old_flags)
2248 dev_mc_upload(dev);
2249}
2250
2251unsigned dev_get_flags(const struct net_device *dev)
2252{
2253 unsigned flags;
2254
2255 flags = (dev->flags & ~(IFF_PROMISC |
2256 IFF_ALLMULTI |
Stefan Rompfb00055a2006-03-20 17:09:11 -08002257 IFF_RUNNING |
2258 IFF_LOWER_UP |
2259 IFF_DORMANT)) |
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260 (dev->gflags & (IFF_PROMISC |
2261 IFF_ALLMULTI));
2262
Stefan Rompfb00055a2006-03-20 17:09:11 -08002263 if (netif_running(dev)) {
2264 if (netif_oper_up(dev))
2265 flags |= IFF_RUNNING;
2266 if (netif_carrier_ok(dev))
2267 flags |= IFF_LOWER_UP;
2268 if (netif_dormant(dev))
2269 flags |= IFF_DORMANT;
2270 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002271
2272 return flags;
2273}
2274
2275int dev_change_flags(struct net_device *dev, unsigned flags)
2276{
2277 int ret;
2278 int old_flags = dev->flags;
2279
2280 /*
2281 * Set the flags on our device.
2282 */
2283
2284 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
2285 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
2286 IFF_AUTOMEDIA)) |
2287 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
2288 IFF_ALLMULTI));
2289
2290 /*
2291 * Load in the correct multicast list now the flags have changed.
2292 */
2293
2294 dev_mc_upload(dev);
2295
2296 /*
2297 * Have we downed the interface. We handle IFF_UP ourselves
2298 * according to user attempts to set it, rather than blindly
2299 * setting it.
2300 */
2301
2302 ret = 0;
2303 if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */
2304 ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
2305
2306 if (!ret)
2307 dev_mc_upload(dev);
2308 }
2309
2310 if (dev->flags & IFF_UP &&
2311 ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI |
2312 IFF_VOLATILE)))
Alan Sternf07d5b92006-05-09 15:23:03 -07002313 raw_notifier_call_chain(&netdev_chain,
Alan Sterne041c682006-03-27 01:16:30 -08002314 NETDEV_CHANGE, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002315
2316 if ((flags ^ dev->gflags) & IFF_PROMISC) {
2317 int inc = (flags & IFF_PROMISC) ? +1 : -1;
2318 dev->gflags ^= IFF_PROMISC;
2319 dev_set_promiscuity(dev, inc);
2320 }
2321
2322 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
2323 is important. Some (broken) drivers set IFF_PROMISC, when
2324 IFF_ALLMULTI is requested not asking us and not reporting.
2325 */
2326 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
2327 int inc = (flags & IFF_ALLMULTI) ? +1 : -1;
2328 dev->gflags ^= IFF_ALLMULTI;
2329 dev_set_allmulti(dev, inc);
2330 }
2331
2332 if (old_flags ^ dev->flags)
2333 rtmsg_ifinfo(RTM_NEWLINK, dev, old_flags ^ dev->flags);
2334
2335 return ret;
2336}
2337
2338int dev_set_mtu(struct net_device *dev, int new_mtu)
2339{
2340 int err;
2341
2342 if (new_mtu == dev->mtu)
2343 return 0;
2344
2345 /* MTU must be positive. */
2346 if (new_mtu < 0)
2347 return -EINVAL;
2348
2349 if (!netif_device_present(dev))
2350 return -ENODEV;
2351
2352 err = 0;
2353 if (dev->change_mtu)
2354 err = dev->change_mtu(dev, new_mtu);
2355 else
2356 dev->mtu = new_mtu;
2357 if (!err && dev->flags & IFF_UP)
Alan Sternf07d5b92006-05-09 15:23:03 -07002358 raw_notifier_call_chain(&netdev_chain,
Alan Sterne041c682006-03-27 01:16:30 -08002359 NETDEV_CHANGEMTU, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002360 return err;
2361}
2362
2363int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
2364{
2365 int err;
2366
2367 if (!dev->set_mac_address)
2368 return -EOPNOTSUPP;
2369 if (sa->sa_family != dev->type)
2370 return -EINVAL;
2371 if (!netif_device_present(dev))
2372 return -ENODEV;
2373 err = dev->set_mac_address(dev, sa);
2374 if (!err)
Alan Sternf07d5b92006-05-09 15:23:03 -07002375 raw_notifier_call_chain(&netdev_chain,
Alan Sterne041c682006-03-27 01:16:30 -08002376 NETDEV_CHANGEADDR, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002377 return err;
2378}
2379
2380/*
2381 * Perform the SIOCxIFxxx calls.
2382 */
2383static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd)
2384{
2385 int err;
2386 struct net_device *dev = __dev_get_by_name(ifr->ifr_name);
2387
2388 if (!dev)
2389 return -ENODEV;
2390
2391 switch (cmd) {
2392 case SIOCGIFFLAGS: /* Get interface flags */
2393 ifr->ifr_flags = dev_get_flags(dev);
2394 return 0;
2395
2396 case SIOCSIFFLAGS: /* Set interface flags */
2397 return dev_change_flags(dev, ifr->ifr_flags);
2398
2399 case SIOCGIFMETRIC: /* Get the metric on the interface
2400 (currently unused) */
2401 ifr->ifr_metric = 0;
2402 return 0;
2403
2404 case SIOCSIFMETRIC: /* Set the metric on the interface
2405 (currently unused) */
2406 return -EOPNOTSUPP;
2407
2408 case SIOCGIFMTU: /* Get the MTU of a device */
2409 ifr->ifr_mtu = dev->mtu;
2410 return 0;
2411
2412 case SIOCSIFMTU: /* Set the MTU of a device */
2413 return dev_set_mtu(dev, ifr->ifr_mtu);
2414
2415 case SIOCGIFHWADDR:
2416 if (!dev->addr_len)
2417 memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data);
2418 else
2419 memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr,
2420 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
2421 ifr->ifr_hwaddr.sa_family = dev->type;
2422 return 0;
2423
2424 case SIOCSIFHWADDR:
2425 return dev_set_mac_address(dev, &ifr->ifr_hwaddr);
2426
2427 case SIOCSIFHWBROADCAST:
2428 if (ifr->ifr_hwaddr.sa_family != dev->type)
2429 return -EINVAL;
2430 memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
2431 min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len));
Alan Sternf07d5b92006-05-09 15:23:03 -07002432 raw_notifier_call_chain(&netdev_chain,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002433 NETDEV_CHANGEADDR, dev);
2434 return 0;
2435
2436 case SIOCGIFMAP:
2437 ifr->ifr_map.mem_start = dev->mem_start;
2438 ifr->ifr_map.mem_end = dev->mem_end;
2439 ifr->ifr_map.base_addr = dev->base_addr;
2440 ifr->ifr_map.irq = dev->irq;
2441 ifr->ifr_map.dma = dev->dma;
2442 ifr->ifr_map.port = dev->if_port;
2443 return 0;
2444
2445 case SIOCSIFMAP:
2446 if (dev->set_config) {
2447 if (!netif_device_present(dev))
2448 return -ENODEV;
2449 return dev->set_config(dev, &ifr->ifr_map);
2450 }
2451 return -EOPNOTSUPP;
2452
2453 case SIOCADDMULTI:
2454 if (!dev->set_multicast_list ||
2455 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2456 return -EINVAL;
2457 if (!netif_device_present(dev))
2458 return -ENODEV;
2459 return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data,
2460 dev->addr_len, 1);
2461
2462 case SIOCDELMULTI:
2463 if (!dev->set_multicast_list ||
2464 ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
2465 return -EINVAL;
2466 if (!netif_device_present(dev))
2467 return -ENODEV;
2468 return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data,
2469 dev->addr_len, 1);
2470
2471 case SIOCGIFINDEX:
2472 ifr->ifr_ifindex = dev->ifindex;
2473 return 0;
2474
2475 case SIOCGIFTXQLEN:
2476 ifr->ifr_qlen = dev->tx_queue_len;
2477 return 0;
2478
2479 case SIOCSIFTXQLEN:
2480 if (ifr->ifr_qlen < 0)
2481 return -EINVAL;
2482 dev->tx_queue_len = ifr->ifr_qlen;
2483 return 0;
2484
2485 case SIOCSIFNAME:
2486 ifr->ifr_newname[IFNAMSIZ-1] = '\0';
2487 return dev_change_name(dev, ifr->ifr_newname);
2488
2489 /*
2490 * Unknown or private ioctl
2491 */
2492
2493 default:
2494 if ((cmd >= SIOCDEVPRIVATE &&
2495 cmd <= SIOCDEVPRIVATE + 15) ||
2496 cmd == SIOCBONDENSLAVE ||
2497 cmd == SIOCBONDRELEASE ||
2498 cmd == SIOCBONDSETHWADDR ||
2499 cmd == SIOCBONDSLAVEINFOQUERY ||
2500 cmd == SIOCBONDINFOQUERY ||
2501 cmd == SIOCBONDCHANGEACTIVE ||
2502 cmd == SIOCGMIIPHY ||
2503 cmd == SIOCGMIIREG ||
2504 cmd == SIOCSMIIREG ||
2505 cmd == SIOCBRADDIF ||
2506 cmd == SIOCBRDELIF ||
2507 cmd == SIOCWANDEV) {
2508 err = -EOPNOTSUPP;
2509 if (dev->do_ioctl) {
2510 if (netif_device_present(dev))
2511 err = dev->do_ioctl(dev, ifr,
2512 cmd);
2513 else
2514 err = -ENODEV;
2515 }
2516 } else
2517 err = -EINVAL;
2518
2519 }
2520 return err;
2521}
2522
2523/*
2524 * This function handles all "interface"-type I/O control requests. The actual
2525 * 'doing' part of this is dev_ifsioc above.
2526 */
2527
2528/**
2529 * dev_ioctl - network device ioctl
2530 * @cmd: command to issue
2531 * @arg: pointer to a struct ifreq in user space
2532 *
2533 * Issue ioctl functions to devices. This is normally called by the
2534 * user space syscall interfaces but can sometimes be useful for
2535 * other purposes. The return value is the return from the syscall if
2536 * positive or a negative errno code on error.
2537 */
2538
2539int dev_ioctl(unsigned int cmd, void __user *arg)
2540{
2541 struct ifreq ifr;
2542 int ret;
2543 char *colon;
2544
2545 /* One special case: SIOCGIFCONF takes ifconf argument
2546 and requires shared lock, because it sleeps writing
2547 to user space.
2548 */
2549
2550 if (cmd == SIOCGIFCONF) {
Stephen Hemminger6756ae42006-03-20 22:23:58 -08002551 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002552 ret = dev_ifconf((char __user *) arg);
Stephen Hemminger6756ae42006-03-20 22:23:58 -08002553 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002554 return ret;
2555 }
2556 if (cmd == SIOCGIFNAME)
2557 return dev_ifname((struct ifreq __user *)arg);
2558
2559 if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
2560 return -EFAULT;
2561
2562 ifr.ifr_name[IFNAMSIZ-1] = 0;
2563
2564 colon = strchr(ifr.ifr_name, ':');
2565 if (colon)
2566 *colon = 0;
2567
2568 /*
2569 * See which interface the caller is talking about.
2570 */
2571
2572 switch (cmd) {
2573 /*
2574 * These ioctl calls:
2575 * - can be done by all.
2576 * - atomic and do not require locking.
2577 * - return a value
2578 */
2579 case SIOCGIFFLAGS:
2580 case SIOCGIFMETRIC:
2581 case SIOCGIFMTU:
2582 case SIOCGIFHWADDR:
2583 case SIOCGIFSLAVE:
2584 case SIOCGIFMAP:
2585 case SIOCGIFINDEX:
2586 case SIOCGIFTXQLEN:
2587 dev_load(ifr.ifr_name);
2588 read_lock(&dev_base_lock);
2589 ret = dev_ifsioc(&ifr, cmd);
2590 read_unlock(&dev_base_lock);
2591 if (!ret) {
2592 if (colon)
2593 *colon = ':';
2594 if (copy_to_user(arg, &ifr,
2595 sizeof(struct ifreq)))
2596 ret = -EFAULT;
2597 }
2598 return ret;
2599
2600 case SIOCETHTOOL:
2601 dev_load(ifr.ifr_name);
2602 rtnl_lock();
2603 ret = dev_ethtool(&ifr);
2604 rtnl_unlock();
2605 if (!ret) {
2606 if (colon)
2607 *colon = ':';
2608 if (copy_to_user(arg, &ifr,
2609 sizeof(struct ifreq)))
2610 ret = -EFAULT;
2611 }
2612 return ret;
2613
2614 /*
2615 * These ioctl calls:
2616 * - require superuser power.
2617 * - require strict serialization.
2618 * - return a value
2619 */
2620 case SIOCGMIIPHY:
2621 case SIOCGMIIREG:
2622 case SIOCSIFNAME:
2623 if (!capable(CAP_NET_ADMIN))
2624 return -EPERM;
2625 dev_load(ifr.ifr_name);
2626 rtnl_lock();
2627 ret = dev_ifsioc(&ifr, cmd);
2628 rtnl_unlock();
2629 if (!ret) {
2630 if (colon)
2631 *colon = ':';
2632 if (copy_to_user(arg, &ifr,
2633 sizeof(struct ifreq)))
2634 ret = -EFAULT;
2635 }
2636 return ret;
2637
2638 /*
2639 * These ioctl calls:
2640 * - require superuser power.
2641 * - require strict serialization.
2642 * - do not return a value
2643 */
2644 case SIOCSIFFLAGS:
2645 case SIOCSIFMETRIC:
2646 case SIOCSIFMTU:
2647 case SIOCSIFMAP:
2648 case SIOCSIFHWADDR:
2649 case SIOCSIFSLAVE:
2650 case SIOCADDMULTI:
2651 case SIOCDELMULTI:
2652 case SIOCSIFHWBROADCAST:
2653 case SIOCSIFTXQLEN:
2654 case SIOCSMIIREG:
2655 case SIOCBONDENSLAVE:
2656 case SIOCBONDRELEASE:
2657 case SIOCBONDSETHWADDR:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002658 case SIOCBONDCHANGEACTIVE:
2659 case SIOCBRADDIF:
2660 case SIOCBRDELIF:
2661 if (!capable(CAP_NET_ADMIN))
2662 return -EPERM;
Thomas Grafcabcac02006-01-24 12:46:33 -08002663 /* fall through */
2664 case SIOCBONDSLAVEINFOQUERY:
2665 case SIOCBONDINFOQUERY:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002666 dev_load(ifr.ifr_name);
2667 rtnl_lock();
2668 ret = dev_ifsioc(&ifr, cmd);
2669 rtnl_unlock();
2670 return ret;
2671
2672 case SIOCGIFMEM:
2673 /* Get the per device memory space. We can add this but
2674 * currently do not support it */
2675 case SIOCSIFMEM:
2676 /* Set the per device memory buffer space.
2677 * Not applicable in our case */
2678 case SIOCSIFLINK:
2679 return -EINVAL;
2680
2681 /*
2682 * Unknown or private ioctl.
2683 */
2684 default:
2685 if (cmd == SIOCWANDEV ||
2686 (cmd >= SIOCDEVPRIVATE &&
2687 cmd <= SIOCDEVPRIVATE + 15)) {
2688 dev_load(ifr.ifr_name);
2689 rtnl_lock();
2690 ret = dev_ifsioc(&ifr, cmd);
2691 rtnl_unlock();
2692 if (!ret && copy_to_user(arg, &ifr,
2693 sizeof(struct ifreq)))
2694 ret = -EFAULT;
2695 return ret;
2696 }
Adrian Bunkd86b5e02006-01-21 00:46:55 +01002697#ifdef CONFIG_WIRELESS_EXT
Linus Torvalds1da177e2005-04-16 15:20:36 -07002698 /* Take care of Wireless Extensions */
2699 if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) {
2700 /* If command is `set a parameter', or
2701 * `get the encoding parameters', check if
2702 * the user has the right to do it */
Jean Tourrilhesa4170162006-04-04 15:53:43 -07002703 if (IW_IS_SET(cmd) || cmd == SIOCGIWENCODE
2704 || cmd == SIOCGIWENCODEEXT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002705 if (!capable(CAP_NET_ADMIN))
2706 return -EPERM;
2707 }
2708 dev_load(ifr.ifr_name);
2709 rtnl_lock();
2710 /* Follow me in net/core/wireless.c */
2711 ret = wireless_process_ioctl(&ifr, cmd);
2712 rtnl_unlock();
2713 if (IW_IS_GET(cmd) &&
2714 copy_to_user(arg, &ifr,
2715 sizeof(struct ifreq)))
2716 ret = -EFAULT;
2717 return ret;
2718 }
Adrian Bunkd86b5e02006-01-21 00:46:55 +01002719#endif /* CONFIG_WIRELESS_EXT */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002720 return -EINVAL;
2721 }
2722}
2723
2724
2725/**
2726 * dev_new_index - allocate an ifindex
2727 *
2728 * Returns a suitable unique value for a new device interface
2729 * number. The caller must hold the rtnl semaphore or the
2730 * dev_base_lock to be sure it remains unique.
2731 */
2732static int dev_new_index(void)
2733{
2734 static int ifindex;
2735 for (;;) {
2736 if (++ifindex <= 0)
2737 ifindex = 1;
2738 if (!__dev_get_by_index(ifindex))
2739 return ifindex;
2740 }
2741}
2742
2743static int dev_boot_phase = 1;
2744
2745/* Delayed registration/unregisteration */
2746static DEFINE_SPINLOCK(net_todo_list_lock);
2747static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list);
2748
2749static inline void net_set_todo(struct net_device *dev)
2750{
2751 spin_lock(&net_todo_list_lock);
2752 list_add_tail(&dev->todo_list, &net_todo_list);
2753 spin_unlock(&net_todo_list_lock);
2754}
2755
2756/**
2757 * register_netdevice - register a network device
2758 * @dev: device to register
2759 *
2760 * Take a completed network device structure and add it to the kernel
2761 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
2762 * chain. 0 is returned on success. A negative errno code is returned
2763 * on a failure to set up the device, or if the name is a duplicate.
2764 *
2765 * Callers must hold the rtnl semaphore. You may want
2766 * register_netdev() instead of this.
2767 *
2768 * BUGS:
2769 * The locking appears insufficient to guarantee two parallel registers
2770 * will not get the same name.
2771 */
2772
2773int register_netdevice(struct net_device *dev)
2774{
2775 struct hlist_head *head;
2776 struct hlist_node *p;
2777 int ret;
2778
2779 BUG_ON(dev_boot_phase);
2780 ASSERT_RTNL();
2781
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07002782 might_sleep();
2783
Linus Torvalds1da177e2005-04-16 15:20:36 -07002784 /* When net_device's are persistent, this will be fatal. */
2785 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
2786
2787 spin_lock_init(&dev->queue_lock);
2788 spin_lock_init(&dev->xmit_lock);
2789 dev->xmit_lock_owner = -1;
2790#ifdef CONFIG_NET_CLS_ACT
2791 spin_lock_init(&dev->ingress_lock);
2792#endif
2793
2794 ret = alloc_divert_blk(dev);
2795 if (ret)
2796 goto out;
2797
2798 dev->iflink = -1;
2799
2800 /* Init, if this function is available */
2801 if (dev->init) {
2802 ret = dev->init(dev);
2803 if (ret) {
2804 if (ret > 0)
2805 ret = -EIO;
2806 goto out_err;
2807 }
2808 }
2809
2810 if (!dev_valid_name(dev->name)) {
2811 ret = -EINVAL;
2812 goto out_err;
2813 }
2814
2815 dev->ifindex = dev_new_index();
2816 if (dev->iflink == -1)
2817 dev->iflink = dev->ifindex;
2818
2819 /* Check for existence of name */
2820 head = dev_name_hash(dev->name);
2821 hlist_for_each(p, head) {
2822 struct net_device *d
2823 = hlist_entry(p, struct net_device, name_hlist);
2824 if (!strncmp(d->name, dev->name, IFNAMSIZ)) {
2825 ret = -EEXIST;
2826 goto out_err;
2827 }
2828 }
2829
2830 /* Fix illegal SG+CSUM combinations. */
2831 if ((dev->features & NETIF_F_SG) &&
2832 !(dev->features & (NETIF_F_IP_CSUM |
2833 NETIF_F_NO_CSUM |
2834 NETIF_F_HW_CSUM))) {
2835 printk("%s: Dropping NETIF_F_SG since no checksum feature.\n",
2836 dev->name);
2837 dev->features &= ~NETIF_F_SG;
2838 }
2839
2840 /* TSO requires that SG is present as well. */
2841 if ((dev->features & NETIF_F_TSO) &&
2842 !(dev->features & NETIF_F_SG)) {
2843 printk("%s: Dropping NETIF_F_TSO since no SG feature.\n",
2844 dev->name);
2845 dev->features &= ~NETIF_F_TSO;
2846 }
Ananda Rajue89e9cf2005-10-18 15:46:41 -07002847 if (dev->features & NETIF_F_UFO) {
2848 if (!(dev->features & NETIF_F_HW_CSUM)) {
2849 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
2850 "NETIF_F_HW_CSUM feature.\n",
2851 dev->name);
2852 dev->features &= ~NETIF_F_UFO;
2853 }
2854 if (!(dev->features & NETIF_F_SG)) {
2855 printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no "
2856 "NETIF_F_SG feature.\n",
2857 dev->name);
2858 dev->features &= ~NETIF_F_UFO;
2859 }
2860 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002861
2862 /*
2863 * nil rebuild_header routine,
2864 * that should be never called and used as just bug trap.
2865 */
2866
2867 if (!dev->rebuild_header)
2868 dev->rebuild_header = default_rebuild_header;
2869
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07002870 ret = netdev_register_sysfs(dev);
2871 if (ret)
2872 goto out_err;
2873 dev->reg_state = NETREG_REGISTERED;
2874
Linus Torvalds1da177e2005-04-16 15:20:36 -07002875 /*
2876 * Default initial state at registry is that the
2877 * device is present.
2878 */
2879
2880 set_bit(__LINK_STATE_PRESENT, &dev->state);
2881
2882 dev->next = NULL;
2883 dev_init_scheduler(dev);
2884 write_lock_bh(&dev_base_lock);
2885 *dev_tail = dev;
2886 dev_tail = &dev->next;
2887 hlist_add_head(&dev->name_hlist, head);
2888 hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex));
2889 dev_hold(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002890 write_unlock_bh(&dev_base_lock);
2891
2892 /* Notify protocols, that a new device appeared. */
Alan Sternf07d5b92006-05-09 15:23:03 -07002893 raw_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002894
Linus Torvalds1da177e2005-04-16 15:20:36 -07002895 ret = 0;
2896
2897out:
2898 return ret;
2899out_err:
2900 free_divert_blk(dev);
2901 goto out;
2902}
2903
2904/**
2905 * register_netdev - register a network device
2906 * @dev: device to register
2907 *
2908 * Take a completed network device structure and add it to the kernel
2909 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
2910 * chain. 0 is returned on success. A negative errno code is returned
2911 * on a failure to set up the device, or if the name is a duplicate.
2912 *
2913 * This is a wrapper around register_netdev that takes the rtnl semaphore
2914 * and expands the device name if you passed a format string to
2915 * alloc_netdev.
2916 */
2917int register_netdev(struct net_device *dev)
2918{
2919 int err;
2920
2921 rtnl_lock();
2922
2923 /*
2924 * If the name is a format string the caller wants us to do a
2925 * name allocation.
2926 */
2927 if (strchr(dev->name, '%')) {
2928 err = dev_alloc_name(dev, dev->name);
2929 if (err < 0)
2930 goto out;
2931 }
2932
2933 /*
2934 * Back compatibility hook. Kill this one in 2.5
2935 */
2936 if (dev->name[0] == 0 || dev->name[0] == ' ') {
2937 err = dev_alloc_name(dev, "eth%d");
2938 if (err < 0)
2939 goto out;
2940 }
2941
2942 err = register_netdevice(dev);
2943out:
2944 rtnl_unlock();
2945 return err;
2946}
2947EXPORT_SYMBOL(register_netdev);
2948
2949/*
2950 * netdev_wait_allrefs - wait until all references are gone.
2951 *
2952 * This is called when unregistering network devices.
2953 *
2954 * Any protocol or device that holds a reference should register
2955 * for netdevice notification, and cleanup and put back the
2956 * reference if they receive an UNREGISTER event.
2957 * We can get stuck here if buggy protocols don't correctly
2958 * call dev_put.
2959 */
2960static void netdev_wait_allrefs(struct net_device *dev)
2961{
2962 unsigned long rebroadcast_time, warning_time;
2963
2964 rebroadcast_time = warning_time = jiffies;
2965 while (atomic_read(&dev->refcnt) != 0) {
2966 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
Stephen Hemminger6756ae42006-03-20 22:23:58 -08002967 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002968
2969 /* Rebroadcast unregister notification */
Alan Sternf07d5b92006-05-09 15:23:03 -07002970 raw_notifier_call_chain(&netdev_chain,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002971 NETDEV_UNREGISTER, dev);
2972
2973 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
2974 &dev->state)) {
2975 /* We must not have linkwatch events
2976 * pending on unregister. If this
2977 * happens, we simply run the queue
2978 * unscheduled, resulting in a noop
2979 * for this device.
2980 */
2981 linkwatch_run_queue();
2982 }
2983
Stephen Hemminger6756ae42006-03-20 22:23:58 -08002984 __rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002985
2986 rebroadcast_time = jiffies;
2987 }
2988
2989 msleep(250);
2990
2991 if (time_after(jiffies, warning_time + 10 * HZ)) {
2992 printk(KERN_EMERG "unregister_netdevice: "
2993 "waiting for %s to become free. Usage "
2994 "count = %d\n",
2995 dev->name, atomic_read(&dev->refcnt));
2996 warning_time = jiffies;
2997 }
2998 }
2999}
3000
3001/* The sequence is:
3002 *
3003 * rtnl_lock();
3004 * ...
3005 * register_netdevice(x1);
3006 * register_netdevice(x2);
3007 * ...
3008 * unregister_netdevice(y1);
3009 * unregister_netdevice(y2);
3010 * ...
3011 * rtnl_unlock();
3012 * free_netdev(y1);
3013 * free_netdev(y2);
3014 *
3015 * We are invoked by rtnl_unlock() after it drops the semaphore.
3016 * This allows us to deal with problems:
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07003017 * 1) We can delete sysfs objects which invoke hotplug
Linus Torvalds1da177e2005-04-16 15:20:36 -07003018 * without deadlocking with linkwatch via keventd.
3019 * 2) Since we run with the RTNL semaphore not held, we can sleep
3020 * safely in order to wait for the netdev refcnt to drop to zero.
3021 */
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08003022static DEFINE_MUTEX(net_todo_run_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003023void netdev_run_todo(void)
3024{
3025 struct list_head list = LIST_HEAD_INIT(list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003026
3027 /* Need to guard against multiple cpu's getting out of order. */
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08003028 mutex_lock(&net_todo_run_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003029
3030 /* Not safe to do outside the semaphore. We must not return
3031 * until all unregister events invoked by the local processor
3032 * have been completed (either by this todo run, or one on
3033 * another cpu).
3034 */
3035 if (list_empty(&net_todo_list))
3036 goto out;
3037
3038 /* Snapshot list, allow later requests */
3039 spin_lock(&net_todo_list_lock);
3040 list_splice_init(&net_todo_list, &list);
3041 spin_unlock(&net_todo_list_lock);
3042
3043 while (!list_empty(&list)) {
3044 struct net_device *dev
3045 = list_entry(list.next, struct net_device, todo_list);
3046 list_del(&dev->todo_list);
3047
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07003048 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003049 printk(KERN_ERR "network todo '%s' but state %d\n",
3050 dev->name, dev->reg_state);
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07003051 dump_stack();
3052 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003053 }
Stephen Hemmingerb17a7c12006-05-10 13:21:17 -07003054
3055 netdev_unregister_sysfs(dev);
3056 dev->reg_state = NETREG_UNREGISTERED;
3057
3058 netdev_wait_allrefs(dev);
3059
3060 /* paranoia */
3061 BUG_ON(atomic_read(&dev->refcnt));
3062 BUG_TRAP(!dev->ip_ptr);
3063 BUG_TRAP(!dev->ip6_ptr);
3064 BUG_TRAP(!dev->dn_ptr);
3065
3066 /* It must be the very last action,
3067 * after this 'dev' may point to freed up memory.
3068 */
3069 if (dev->destructor)
3070 dev->destructor(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003071 }
3072
3073out:
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -08003074 mutex_unlock(&net_todo_run_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003075}
3076
3077/**
3078 * alloc_netdev - allocate network device
3079 * @sizeof_priv: size of private data to allocate space for
3080 * @name: device name format string
3081 * @setup: callback to initialize device
3082 *
3083 * Allocates a struct net_device with private data area for driver use
3084 * and performs basic initialization.
3085 */
3086struct net_device *alloc_netdev(int sizeof_priv, const char *name,
3087 void (*setup)(struct net_device *))
3088{
3089 void *p;
3090 struct net_device *dev;
3091 int alloc_size;
3092
3093 /* ensure 32-byte alignment of both the device and private area */
3094 alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
3095 alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
3096
Paolo 'Blaisorblade' Giarrusso31380de2006-04-06 22:38:28 -07003097 p = kzalloc(alloc_size, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003098 if (!p) {
3099 printk(KERN_ERR "alloc_dev: Unable to allocate device.\n");
3100 return NULL;
3101 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003102
3103 dev = (struct net_device *)
3104 (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
3105 dev->padded = (char *)dev - (char *)p;
3106
3107 if (sizeof_priv)
3108 dev->priv = netdev_priv(dev);
3109
3110 setup(dev);
3111 strcpy(dev->name, name);
3112 return dev;
3113}
3114EXPORT_SYMBOL(alloc_netdev);
3115
3116/**
3117 * free_netdev - free network device
3118 * @dev: device
3119 *
3120 * This function does the last stage of destroying an allocated device
3121 * interface. The reference to the device object is released.
3122 * If this is the last reference then it will be freed.
3123 */
3124void free_netdev(struct net_device *dev)
3125{
3126#ifdef CONFIG_SYSFS
Stephen Hemminger3041a062006-05-26 13:25:24 -07003127 /* Compatibility with error handling in drivers */
Linus Torvalds1da177e2005-04-16 15:20:36 -07003128 if (dev->reg_state == NETREG_UNINITIALIZED) {
3129 kfree((char *)dev - dev->padded);
3130 return;
3131 }
3132
3133 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
3134 dev->reg_state = NETREG_RELEASED;
3135
3136 /* will free via class release */
3137 class_device_put(&dev->class_dev);
3138#else
3139 kfree((char *)dev - dev->padded);
3140#endif
3141}
3142
3143/* Synchronize with packet receive processing. */
3144void synchronize_net(void)
3145{
3146 might_sleep();
Paul E. McKenneyfbd568a3e2005-05-01 08:59:04 -07003147 synchronize_rcu();
Linus Torvalds1da177e2005-04-16 15:20:36 -07003148}
3149
3150/**
3151 * unregister_netdevice - remove device from the kernel
3152 * @dev: device
3153 *
3154 * This function shuts down a device interface and removes it
3155 * from the kernel tables. On success 0 is returned, on a failure
3156 * a negative errno code is returned.
3157 *
3158 * Callers must hold the rtnl semaphore. You may want
3159 * unregister_netdev() instead of this.
3160 */
3161
3162int unregister_netdevice(struct net_device *dev)
3163{
3164 struct net_device *d, **dp;
3165
3166 BUG_ON(dev_boot_phase);
3167 ASSERT_RTNL();
3168
3169 /* Some devices call without registering for initialization unwind. */
3170 if (dev->reg_state == NETREG_UNINITIALIZED) {
3171 printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
3172 "was registered\n", dev->name, dev);
3173 return -ENODEV;
3174 }
3175
3176 BUG_ON(dev->reg_state != NETREG_REGISTERED);
3177
3178 /* If device is running, close it first. */
3179 if (dev->flags & IFF_UP)
3180 dev_close(dev);
3181
3182 /* And unlink it from device chain. */
3183 for (dp = &dev_base; (d = *dp) != NULL; dp = &d->next) {
3184 if (d == dev) {
3185 write_lock_bh(&dev_base_lock);
3186 hlist_del(&dev->name_hlist);
3187 hlist_del(&dev->index_hlist);
3188 if (dev_tail == &dev->next)
3189 dev_tail = dp;
3190 *dp = d->next;
3191 write_unlock_bh(&dev_base_lock);
3192 break;
3193 }
3194 }
3195 if (!d) {
3196 printk(KERN_ERR "unregister net_device: '%s' not found\n",
3197 dev->name);
3198 return -ENODEV;
3199 }
3200
3201 dev->reg_state = NETREG_UNREGISTERING;
3202
3203 synchronize_net();
3204
3205 /* Shutdown queueing discipline. */
3206 dev_shutdown(dev);
3207
3208
3209 /* Notify protocols, that we are about to destroy
3210 this device. They should clean all the things.
3211 */
Alan Sternf07d5b92006-05-09 15:23:03 -07003212 raw_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003213
3214 /*
3215 * Flush the multicast chain
3216 */
3217 dev_mc_discard(dev);
3218
3219 if (dev->uninit)
3220 dev->uninit(dev);
3221
3222 /* Notifier chain MUST detach us from master device. */
3223 BUG_TRAP(!dev->master);
3224
3225 free_divert_blk(dev);
3226
3227 /* Finish processing unregister after unlock */
3228 net_set_todo(dev);
3229
3230 synchronize_net();
3231
3232 dev_put(dev);
3233 return 0;
3234}
3235
3236/**
3237 * unregister_netdev - remove device from the kernel
3238 * @dev: device
3239 *
3240 * This function shuts down a device interface and removes it
3241 * from the kernel tables. On success 0 is returned, on a failure
3242 * a negative errno code is returned.
3243 *
3244 * This is just a wrapper for unregister_netdevice that takes
3245 * the rtnl semaphore. In general you want to use this and not
3246 * unregister_netdevice.
3247 */
3248void unregister_netdev(struct net_device *dev)
3249{
3250 rtnl_lock();
3251 unregister_netdevice(dev);
3252 rtnl_unlock();
3253}
3254
3255EXPORT_SYMBOL(unregister_netdev);
3256
3257#ifdef CONFIG_HOTPLUG_CPU
3258static int dev_cpu_callback(struct notifier_block *nfb,
3259 unsigned long action,
3260 void *ocpu)
3261{
3262 struct sk_buff **list_skb;
3263 struct net_device **list_net;
3264 struct sk_buff *skb;
3265 unsigned int cpu, oldcpu = (unsigned long)ocpu;
3266 struct softnet_data *sd, *oldsd;
3267
3268 if (action != CPU_DEAD)
3269 return NOTIFY_OK;
3270
3271 local_irq_disable();
3272 cpu = smp_processor_id();
3273 sd = &per_cpu(softnet_data, cpu);
3274 oldsd = &per_cpu(softnet_data, oldcpu);
3275
3276 /* Find end of our completion_queue. */
3277 list_skb = &sd->completion_queue;
3278 while (*list_skb)
3279 list_skb = &(*list_skb)->next;
3280 /* Append completion queue from offline CPU. */
3281 *list_skb = oldsd->completion_queue;
3282 oldsd->completion_queue = NULL;
3283
3284 /* Find end of our output_queue. */
3285 list_net = &sd->output_queue;
3286 while (*list_net)
3287 list_net = &(*list_net)->next_sched;
3288 /* Append output queue from offline CPU. */
3289 *list_net = oldsd->output_queue;
3290 oldsd->output_queue = NULL;
3291
3292 raise_softirq_irqoff(NET_TX_SOFTIRQ);
3293 local_irq_enable();
3294
3295 /* Process offline CPU's input_pkt_queue */
3296 while ((skb = __skb_dequeue(&oldsd->input_pkt_queue)))
3297 netif_rx(skb);
3298
3299 return NOTIFY_OK;
3300}
3301#endif /* CONFIG_HOTPLUG_CPU */
3302
3303
3304/*
3305 * Initialize the DEV module. At boot time this walks the device list and
3306 * unhooks any devices that fail to initialise (normally hardware not
3307 * present) and leaves us with a valid list of present and active devices.
3308 *
3309 */
3310
3311/*
3312 * This is called single threaded during boot, so no need
3313 * to take the rtnl semaphore.
3314 */
3315static int __init net_dev_init(void)
3316{
3317 int i, rc = -ENOMEM;
3318
3319 BUG_ON(!dev_boot_phase);
3320
3321 net_random_init();
3322
3323 if (dev_proc_init())
3324 goto out;
3325
3326 if (netdev_sysfs_init())
3327 goto out;
3328
3329 INIT_LIST_HEAD(&ptype_all);
3330 for (i = 0; i < 16; i++)
3331 INIT_LIST_HEAD(&ptype_base[i]);
3332
3333 for (i = 0; i < ARRAY_SIZE(dev_name_head); i++)
3334 INIT_HLIST_HEAD(&dev_name_head[i]);
3335
3336 for (i = 0; i < ARRAY_SIZE(dev_index_head); i++)
3337 INIT_HLIST_HEAD(&dev_index_head[i]);
3338
3339 /*
3340 * Initialise the packet receive queues.
3341 */
3342
KAMEZAWA Hiroyuki6f912042006-04-10 22:52:50 -07003343 for_each_possible_cpu(i) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003344 struct softnet_data *queue;
3345
3346 queue = &per_cpu(softnet_data, i);
3347 skb_queue_head_init(&queue->input_pkt_queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003348 queue->completion_queue = NULL;
3349 INIT_LIST_HEAD(&queue->poll_list);
3350 set_bit(__LINK_STATE_START, &queue->backlog_dev.state);
3351 queue->backlog_dev.weight = weight_p;
3352 queue->backlog_dev.poll = process_backlog;
3353 atomic_set(&queue->backlog_dev.refcnt, 1);
3354 }
3355
Linus Torvalds1da177e2005-04-16 15:20:36 -07003356 dev_boot_phase = 0;
3357
3358 open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL);
3359 open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL);
3360
3361 hotcpu_notifier(dev_cpu_callback, 0);
3362 dst_init();
3363 dev_mcast_init();
3364 rc = 0;
3365out:
3366 return rc;
3367}
3368
3369subsys_initcall(net_dev_init);
3370
3371EXPORT_SYMBOL(__dev_get_by_index);
3372EXPORT_SYMBOL(__dev_get_by_name);
3373EXPORT_SYMBOL(__dev_remove_pack);
3374EXPORT_SYMBOL(__skb_linearize);
Mitch Williamsc2373ee2005-11-09 10:34:45 -08003375EXPORT_SYMBOL(dev_valid_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003376EXPORT_SYMBOL(dev_add_pack);
3377EXPORT_SYMBOL(dev_alloc_name);
3378EXPORT_SYMBOL(dev_close);
3379EXPORT_SYMBOL(dev_get_by_flags);
3380EXPORT_SYMBOL(dev_get_by_index);
3381EXPORT_SYMBOL(dev_get_by_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003382EXPORT_SYMBOL(dev_open);
3383EXPORT_SYMBOL(dev_queue_xmit);
3384EXPORT_SYMBOL(dev_remove_pack);
3385EXPORT_SYMBOL(dev_set_allmulti);
3386EXPORT_SYMBOL(dev_set_promiscuity);
3387EXPORT_SYMBOL(dev_change_flags);
3388EXPORT_SYMBOL(dev_set_mtu);
3389EXPORT_SYMBOL(dev_set_mac_address);
3390EXPORT_SYMBOL(free_netdev);
3391EXPORT_SYMBOL(netdev_boot_setup_check);
3392EXPORT_SYMBOL(netdev_set_master);
3393EXPORT_SYMBOL(netdev_state_change);
3394EXPORT_SYMBOL(netif_receive_skb);
3395EXPORT_SYMBOL(netif_rx);
3396EXPORT_SYMBOL(register_gifconf);
3397EXPORT_SYMBOL(register_netdevice);
3398EXPORT_SYMBOL(register_netdevice_notifier);
3399EXPORT_SYMBOL(skb_checksum_help);
3400EXPORT_SYMBOL(synchronize_net);
3401EXPORT_SYMBOL(unregister_netdevice);
3402EXPORT_SYMBOL(unregister_netdevice_notifier);
3403EXPORT_SYMBOL(net_enable_timestamp);
3404EXPORT_SYMBOL(net_disable_timestamp);
3405EXPORT_SYMBOL(dev_get_flags);
3406
3407#if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)
3408EXPORT_SYMBOL(br_handle_frame_hook);
3409EXPORT_SYMBOL(br_fdb_get_hook);
3410EXPORT_SYMBOL(br_fdb_put_hook);
3411#endif
3412
3413#ifdef CONFIG_KMOD
3414EXPORT_SYMBOL(dev_load);
3415#endif
3416
3417EXPORT_PER_CPU_SYMBOL(softnet_data);