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1da177e4 LT |
1 | /* |
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 | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * 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> | |
4fc268d2 | 78 | #include <linux/capability.h> |
1da177e4 LT |
79 | #include <linux/cpu.h> |
80 | #include <linux/types.h> | |
81 | #include <linux/kernel.h> | |
82 | #include <linux/sched.h> | |
4a3e2f71 | 83 | #include <linux/mutex.h> |
1da177e4 LT |
84 | #include <linux/string.h> |
85 | #include <linux/mm.h> | |
86 | #include <linux/socket.h> | |
87 | #include <linux/sockios.h> | |
88 | #include <linux/errno.h> | |
89 | #include <linux/interrupt.h> | |
90 | #include <linux/if_ether.h> | |
91 | #include <linux/netdevice.h> | |
92 | #include <linux/etherdevice.h> | |
93 | #include <linux/notifier.h> | |
94 | #include <linux/skbuff.h> | |
95 | #include <net/sock.h> | |
96 | #include <linux/rtnetlink.h> | |
97 | #include <linux/proc_fs.h> | |
98 | #include <linux/seq_file.h> | |
99 | #include <linux/stat.h> | |
100 | #include <linux/if_bridge.h> | |
1da177e4 LT |
101 | #include <net/dst.h> |
102 | #include <net/pkt_sched.h> | |
103 | #include <net/checksum.h> | |
104 | #include <linux/highmem.h> | |
105 | #include <linux/init.h> | |
106 | #include <linux/kmod.h> | |
107 | #include <linux/module.h> | |
108 | #include <linux/kallsyms.h> | |
109 | #include <linux/netpoll.h> | |
110 | #include <linux/rcupdate.h> | |
111 | #include <linux/delay.h> | |
295f4a1f | 112 | #include <net/wext.h> |
1da177e4 | 113 | #include <net/iw_handler.h> |
1da177e4 | 114 | #include <asm/current.h> |
5bdb9886 | 115 | #include <linux/audit.h> |
db217334 | 116 | #include <linux/dmaengine.h> |
f6a78bfc | 117 | #include <linux/err.h> |
c7fa9d18 | 118 | #include <linux/ctype.h> |
1da177e4 | 119 | |
1da177e4 LT |
120 | /* |
121 | * The list of packet types we will receive (as opposed to discard) | |
122 | * and the routines to invoke. | |
123 | * | |
124 | * Why 16. Because with 16 the only overlap we get on a hash of the | |
125 | * low nibble of the protocol value is RARP/SNAP/X.25. | |
126 | * | |
127 | * NOTE: That is no longer true with the addition of VLAN tags. Not | |
128 | * sure which should go first, but I bet it won't make much | |
129 | * difference if we are running VLANs. The good news is that | |
130 | * this protocol won't be in the list unless compiled in, so | |
3041a069 | 131 | * the average user (w/out VLANs) will not be adversely affected. |
1da177e4 LT |
132 | * --BLG |
133 | * | |
134 | * 0800 IP | |
135 | * 8100 802.1Q VLAN | |
136 | * 0001 802.3 | |
137 | * 0002 AX.25 | |
138 | * 0004 802.2 | |
139 | * 8035 RARP | |
140 | * 0005 SNAP | |
141 | * 0805 X.25 | |
142 | * 0806 ARP | |
143 | * 8137 IPX | |
144 | * 0009 Localtalk | |
145 | * 86DD IPv6 | |
146 | */ | |
147 | ||
148 | static DEFINE_SPINLOCK(ptype_lock); | |
6b2bedc3 SH |
149 | static struct list_head ptype_base[16] __read_mostly; /* 16 way hashed list */ |
150 | static struct list_head ptype_all __read_mostly; /* Taps */ | |
1da177e4 | 151 | |
db217334 CL |
152 | #ifdef CONFIG_NET_DMA |
153 | static struct dma_client *net_dma_client; | |
154 | static unsigned int net_dma_count; | |
155 | static spinlock_t net_dma_event_lock; | |
156 | #endif | |
157 | ||
1da177e4 | 158 | /* |
7562f876 | 159 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
160 | * semaphore. |
161 | * | |
162 | * Pure readers hold dev_base_lock for reading. | |
163 | * | |
164 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 165 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
166 | * actual updates. This allows pure readers to access the list even |
167 | * while a writer is preparing to update it. | |
168 | * | |
169 | * To put it another way, dev_base_lock is held for writing only to | |
170 | * protect against pure readers; the rtnl semaphore provides the | |
171 | * protection against other writers. | |
172 | * | |
173 | * See, for example usages, register_netdevice() and | |
174 | * unregister_netdevice(), which must be called with the rtnl | |
175 | * semaphore held. | |
176 | */ | |
7562f876 | 177 | LIST_HEAD(dev_base_head); |
1da177e4 LT |
178 | DEFINE_RWLOCK(dev_base_lock); |
179 | ||
7562f876 | 180 | EXPORT_SYMBOL(dev_base_head); |
1da177e4 LT |
181 | EXPORT_SYMBOL(dev_base_lock); |
182 | ||
183 | #define NETDEV_HASHBITS 8 | |
184 | static struct hlist_head dev_name_head[1<<NETDEV_HASHBITS]; | |
185 | static struct hlist_head dev_index_head[1<<NETDEV_HASHBITS]; | |
186 | ||
187 | static inline struct hlist_head *dev_name_hash(const char *name) | |
188 | { | |
189 | unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); | |
190 | return &dev_name_head[hash & ((1<<NETDEV_HASHBITS)-1)]; | |
191 | } | |
192 | ||
193 | static inline struct hlist_head *dev_index_hash(int ifindex) | |
194 | { | |
195 | return &dev_index_head[ifindex & ((1<<NETDEV_HASHBITS)-1)]; | |
196 | } | |
197 | ||
198 | /* | |
199 | * Our notifier list | |
200 | */ | |
201 | ||
f07d5b94 | 202 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
203 | |
204 | /* | |
205 | * Device drivers call our routines to queue packets here. We empty the | |
206 | * queue in the local softnet handler. | |
207 | */ | |
31aa02c5 | 208 | DEFINE_PER_CPU(struct softnet_data, softnet_data) = { NULL }; |
1da177e4 LT |
209 | |
210 | #ifdef CONFIG_SYSFS | |
211 | extern int netdev_sysfs_init(void); | |
212 | extern int netdev_register_sysfs(struct net_device *); | |
213 | extern void netdev_unregister_sysfs(struct net_device *); | |
214 | #else | |
215 | #define netdev_sysfs_init() (0) | |
216 | #define netdev_register_sysfs(dev) (0) | |
217 | #define netdev_unregister_sysfs(dev) do { } while(0) | |
218 | #endif | |
219 | ||
220 | ||
221 | /******************************************************************************* | |
222 | ||
223 | Protocol management and registration routines | |
224 | ||
225 | *******************************************************************************/ | |
226 | ||
1da177e4 LT |
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 | * | |
4ec93edb | 251 | * This call does not sleep therefore it can not |
1da177e4 LT |
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 | ||
256 | void dev_add_pack(struct packet_type *pt) | |
257 | { | |
258 | int hash; | |
259 | ||
260 | spin_lock_bh(&ptype_lock); | |
9be9a6b9 | 261 | if (pt->type == htons(ETH_P_ALL)) |
1da177e4 | 262 | list_add_rcu(&pt->list, &ptype_all); |
9be9a6b9 | 263 | else { |
1da177e4 LT |
264 | hash = ntohs(pt->type) & 15; |
265 | list_add_rcu(&pt->list, &ptype_base[hash]); | |
266 | } | |
267 | spin_unlock_bh(&ptype_lock); | |
268 | } | |
269 | ||
1da177e4 LT |
270 | /** |
271 | * __dev_remove_pack - remove packet handler | |
272 | * @pt: packet type declaration | |
273 | * | |
274 | * Remove a protocol handler that was previously added to the kernel | |
275 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
276 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 277 | * returns. |
1da177e4 LT |
278 | * |
279 | * The packet type might still be in use by receivers | |
280 | * and must not be freed until after all the CPU's have gone | |
281 | * through a quiescent state. | |
282 | */ | |
283 | void __dev_remove_pack(struct packet_type *pt) | |
284 | { | |
285 | struct list_head *head; | |
286 | struct packet_type *pt1; | |
287 | ||
288 | spin_lock_bh(&ptype_lock); | |
289 | ||
9be9a6b9 | 290 | if (pt->type == htons(ETH_P_ALL)) |
1da177e4 | 291 | head = &ptype_all; |
9be9a6b9 | 292 | else |
1da177e4 LT |
293 | head = &ptype_base[ntohs(pt->type) & 15]; |
294 | ||
295 | list_for_each_entry(pt1, head, list) { | |
296 | if (pt == pt1) { | |
297 | list_del_rcu(&pt->list); | |
298 | goto out; | |
299 | } | |
300 | } | |
301 | ||
302 | printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt); | |
303 | out: | |
304 | spin_unlock_bh(&ptype_lock); | |
305 | } | |
306 | /** | |
307 | * dev_remove_pack - remove packet handler | |
308 | * @pt: packet type declaration | |
309 | * | |
310 | * Remove a protocol handler that was previously added to the kernel | |
311 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
312 | * from the kernel lists and can be freed or reused once this function | |
313 | * returns. | |
314 | * | |
315 | * This call sleeps to guarantee that no CPU is looking at the packet | |
316 | * type after return. | |
317 | */ | |
318 | void dev_remove_pack(struct packet_type *pt) | |
319 | { | |
320 | __dev_remove_pack(pt); | |
4ec93edb | 321 | |
1da177e4 LT |
322 | synchronize_net(); |
323 | } | |
324 | ||
325 | /****************************************************************************** | |
326 | ||
327 | Device Boot-time Settings Routines | |
328 | ||
329 | *******************************************************************************/ | |
330 | ||
331 | /* Boot time configuration table */ | |
332 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
333 | ||
334 | /** | |
335 | * netdev_boot_setup_add - add new setup entry | |
336 | * @name: name of the device | |
337 | * @map: configured settings for the device | |
338 | * | |
339 | * Adds new setup entry to the dev_boot_setup list. The function | |
340 | * returns 0 on error and 1 on success. This is a generic routine to | |
341 | * all netdevices. | |
342 | */ | |
343 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
344 | { | |
345 | struct netdev_boot_setup *s; | |
346 | int i; | |
347 | ||
348 | s = dev_boot_setup; | |
349 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
350 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
351 | memset(s[i].name, 0, sizeof(s[i].name)); | |
352 | strcpy(s[i].name, name); | |
353 | memcpy(&s[i].map, map, sizeof(s[i].map)); | |
354 | break; | |
355 | } | |
356 | } | |
357 | ||
358 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
359 | } | |
360 | ||
361 | /** | |
362 | * netdev_boot_setup_check - check boot time settings | |
363 | * @dev: the netdevice | |
364 | * | |
365 | * Check boot time settings for the device. | |
366 | * The found settings are set for the device to be used | |
367 | * later in the device probing. | |
368 | * Returns 0 if no settings found, 1 if they are. | |
369 | */ | |
370 | int netdev_boot_setup_check(struct net_device *dev) | |
371 | { | |
372 | struct netdev_boot_setup *s = dev_boot_setup; | |
373 | int i; | |
374 | ||
375 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
376 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
377 | !strncmp(dev->name, s[i].name, strlen(s[i].name))) { | |
378 | dev->irq = s[i].map.irq; | |
379 | dev->base_addr = s[i].map.base_addr; | |
380 | dev->mem_start = s[i].map.mem_start; | |
381 | dev->mem_end = s[i].map.mem_end; | |
382 | return 1; | |
383 | } | |
384 | } | |
385 | return 0; | |
386 | } | |
387 | ||
388 | ||
389 | /** | |
390 | * netdev_boot_base - get address from boot time settings | |
391 | * @prefix: prefix for network device | |
392 | * @unit: id for network device | |
393 | * | |
394 | * Check boot time settings for the base address of device. | |
395 | * The found settings are set for the device to be used | |
396 | * later in the device probing. | |
397 | * Returns 0 if no settings found. | |
398 | */ | |
399 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
400 | { | |
401 | const struct netdev_boot_setup *s = dev_boot_setup; | |
402 | char name[IFNAMSIZ]; | |
403 | int i; | |
404 | ||
405 | sprintf(name, "%s%d", prefix, unit); | |
406 | ||
407 | /* | |
408 | * If device already registered then return base of 1 | |
409 | * to indicate not to probe for this interface | |
410 | */ | |
411 | if (__dev_get_by_name(name)) | |
412 | return 1; | |
413 | ||
414 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
415 | if (!strcmp(name, s[i].name)) | |
416 | return s[i].map.base_addr; | |
417 | return 0; | |
418 | } | |
419 | ||
420 | /* | |
421 | * Saves at boot time configured settings for any netdevice. | |
422 | */ | |
423 | int __init netdev_boot_setup(char *str) | |
424 | { | |
425 | int ints[5]; | |
426 | struct ifmap map; | |
427 | ||
428 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
429 | if (!str || !*str) | |
430 | return 0; | |
431 | ||
432 | /* Save settings */ | |
433 | memset(&map, 0, sizeof(map)); | |
434 | if (ints[0] > 0) | |
435 | map.irq = ints[1]; | |
436 | if (ints[0] > 1) | |
437 | map.base_addr = ints[2]; | |
438 | if (ints[0] > 2) | |
439 | map.mem_start = ints[3]; | |
440 | if (ints[0] > 3) | |
441 | map.mem_end = ints[4]; | |
442 | ||
443 | /* Add new entry to the list */ | |
444 | return netdev_boot_setup_add(str, &map); | |
445 | } | |
446 | ||
447 | __setup("netdev=", netdev_boot_setup); | |
448 | ||
449 | /******************************************************************************* | |
450 | ||
451 | Device Interface Subroutines | |
452 | ||
453 | *******************************************************************************/ | |
454 | ||
455 | /** | |
456 | * __dev_get_by_name - find a device by its name | |
457 | * @name: name to find | |
458 | * | |
459 | * Find an interface by name. Must be called under RTNL semaphore | |
460 | * or @dev_base_lock. If the name is found a pointer to the device | |
461 | * is returned. If the name is not found then %NULL is returned. The | |
462 | * reference counters are not incremented so the caller must be | |
463 | * careful with locks. | |
464 | */ | |
465 | ||
466 | struct net_device *__dev_get_by_name(const char *name) | |
467 | { | |
468 | struct hlist_node *p; | |
469 | ||
470 | hlist_for_each(p, dev_name_hash(name)) { | |
471 | struct net_device *dev | |
472 | = hlist_entry(p, struct net_device, name_hlist); | |
473 | if (!strncmp(dev->name, name, IFNAMSIZ)) | |
474 | return dev; | |
475 | } | |
476 | return NULL; | |
477 | } | |
478 | ||
479 | /** | |
480 | * dev_get_by_name - find a device by its name | |
481 | * @name: name to find | |
482 | * | |
483 | * Find an interface by name. This can be called from any | |
484 | * context and does its own locking. The returned handle has | |
485 | * the usage count incremented and the caller must use dev_put() to | |
486 | * release it when it is no longer needed. %NULL is returned if no | |
487 | * matching device is found. | |
488 | */ | |
489 | ||
490 | struct net_device *dev_get_by_name(const char *name) | |
491 | { | |
492 | struct net_device *dev; | |
493 | ||
494 | read_lock(&dev_base_lock); | |
495 | dev = __dev_get_by_name(name); | |
496 | if (dev) | |
497 | dev_hold(dev); | |
498 | read_unlock(&dev_base_lock); | |
499 | return dev; | |
500 | } | |
501 | ||
502 | /** | |
503 | * __dev_get_by_index - find a device by its ifindex | |
504 | * @ifindex: index of device | |
505 | * | |
506 | * Search for an interface by index. Returns %NULL if the device | |
507 | * is not found or a pointer to the device. The device has not | |
508 | * had its reference counter increased so the caller must be careful | |
509 | * about locking. The caller must hold either the RTNL semaphore | |
510 | * or @dev_base_lock. | |
511 | */ | |
512 | ||
513 | struct net_device *__dev_get_by_index(int ifindex) | |
514 | { | |
515 | struct hlist_node *p; | |
516 | ||
517 | hlist_for_each(p, dev_index_hash(ifindex)) { | |
518 | struct net_device *dev | |
519 | = hlist_entry(p, struct net_device, index_hlist); | |
520 | if (dev->ifindex == ifindex) | |
521 | return dev; | |
522 | } | |
523 | return NULL; | |
524 | } | |
525 | ||
526 | ||
527 | /** | |
528 | * dev_get_by_index - find a device by its ifindex | |
529 | * @ifindex: index of device | |
530 | * | |
531 | * Search for an interface by index. Returns NULL if the device | |
532 | * is not found or a pointer to the device. The device returned has | |
533 | * had a reference added and the pointer is safe until the user calls | |
534 | * dev_put to indicate they have finished with it. | |
535 | */ | |
536 | ||
537 | struct net_device *dev_get_by_index(int ifindex) | |
538 | { | |
539 | struct net_device *dev; | |
540 | ||
541 | read_lock(&dev_base_lock); | |
542 | dev = __dev_get_by_index(ifindex); | |
543 | if (dev) | |
544 | dev_hold(dev); | |
545 | read_unlock(&dev_base_lock); | |
546 | return dev; | |
547 | } | |
548 | ||
549 | /** | |
550 | * dev_getbyhwaddr - find a device by its hardware address | |
551 | * @type: media type of device | |
552 | * @ha: hardware address | |
553 | * | |
554 | * Search for an interface by MAC address. Returns NULL if the device | |
555 | * is not found or a pointer to the device. The caller must hold the | |
556 | * rtnl semaphore. The returned device has not had its ref count increased | |
557 | * and the caller must therefore be careful about locking | |
558 | * | |
559 | * BUGS: | |
560 | * If the API was consistent this would be __dev_get_by_hwaddr | |
561 | */ | |
562 | ||
563 | struct net_device *dev_getbyhwaddr(unsigned short type, char *ha) | |
564 | { | |
565 | struct net_device *dev; | |
566 | ||
567 | ASSERT_RTNL(); | |
568 | ||
7562f876 | 569 | for_each_netdev(dev) |
1da177e4 LT |
570 | if (dev->type == type && |
571 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
572 | return dev; |
573 | ||
574 | return NULL; | |
1da177e4 LT |
575 | } |
576 | ||
cf309e3f JF |
577 | EXPORT_SYMBOL(dev_getbyhwaddr); |
578 | ||
4e9cac2b | 579 | struct net_device *__dev_getfirstbyhwtype(unsigned short type) |
1da177e4 LT |
580 | { |
581 | struct net_device *dev; | |
582 | ||
4e9cac2b | 583 | ASSERT_RTNL(); |
7562f876 | 584 | for_each_netdev(dev) |
4e9cac2b | 585 | if (dev->type == type) |
7562f876 PE |
586 | return dev; |
587 | ||
588 | return NULL; | |
4e9cac2b PM |
589 | } |
590 | ||
591 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); | |
592 | ||
593 | struct net_device *dev_getfirstbyhwtype(unsigned short type) | |
594 | { | |
595 | struct net_device *dev; | |
596 | ||
597 | rtnl_lock(); | |
598 | dev = __dev_getfirstbyhwtype(type); | |
599 | if (dev) | |
600 | dev_hold(dev); | |
1da177e4 LT |
601 | rtnl_unlock(); |
602 | return dev; | |
603 | } | |
604 | ||
605 | EXPORT_SYMBOL(dev_getfirstbyhwtype); | |
606 | ||
607 | /** | |
608 | * dev_get_by_flags - find any device with given flags | |
609 | * @if_flags: IFF_* values | |
610 | * @mask: bitmask of bits in if_flags to check | |
611 | * | |
612 | * Search for any interface with the given flags. Returns NULL if a device | |
4ec93edb | 613 | * is not found or a pointer to the device. The device returned has |
1da177e4 LT |
614 | * had a reference added and the pointer is safe until the user calls |
615 | * dev_put to indicate they have finished with it. | |
616 | */ | |
617 | ||
618 | struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mask) | |
619 | { | |
7562f876 | 620 | struct net_device *dev, *ret; |
1da177e4 | 621 | |
7562f876 | 622 | ret = NULL; |
1da177e4 | 623 | read_lock(&dev_base_lock); |
7562f876 | 624 | for_each_netdev(dev) { |
1da177e4 LT |
625 | if (((dev->flags ^ if_flags) & mask) == 0) { |
626 | dev_hold(dev); | |
7562f876 | 627 | ret = dev; |
1da177e4 LT |
628 | break; |
629 | } | |
630 | } | |
631 | read_unlock(&dev_base_lock); | |
7562f876 | 632 | return ret; |
1da177e4 LT |
633 | } |
634 | ||
635 | /** | |
636 | * dev_valid_name - check if name is okay for network device | |
637 | * @name: name string | |
638 | * | |
639 | * Network device names need to be valid file names to | |
c7fa9d18 DM |
640 | * to allow sysfs to work. We also disallow any kind of |
641 | * whitespace. | |
1da177e4 | 642 | */ |
c2373ee9 | 643 | int dev_valid_name(const char *name) |
1da177e4 | 644 | { |
c7fa9d18 DM |
645 | if (*name == '\0') |
646 | return 0; | |
b6fe17d6 SH |
647 | if (strlen(name) >= IFNAMSIZ) |
648 | return 0; | |
c7fa9d18 DM |
649 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
650 | return 0; | |
651 | ||
652 | while (*name) { | |
653 | if (*name == '/' || isspace(*name)) | |
654 | return 0; | |
655 | name++; | |
656 | } | |
657 | return 1; | |
1da177e4 LT |
658 | } |
659 | ||
660 | /** | |
661 | * dev_alloc_name - allocate a name for a device | |
662 | * @dev: device | |
663 | * @name: name format string | |
664 | * | |
665 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
666 | * id. It scans list of devices to build up a free map, then chooses |
667 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
668 | * while allocating the name and adding the device in order to avoid | |
669 | * duplicates. | |
670 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
671 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
672 | */ |
673 | ||
674 | int dev_alloc_name(struct net_device *dev, const char *name) | |
675 | { | |
676 | int i = 0; | |
677 | char buf[IFNAMSIZ]; | |
678 | const char *p; | |
679 | const int max_netdevices = 8*PAGE_SIZE; | |
680 | long *inuse; | |
681 | struct net_device *d; | |
682 | ||
683 | p = strnchr(name, IFNAMSIZ-1, '%'); | |
684 | if (p) { | |
685 | /* | |
686 | * Verify the string as this thing may have come from | |
687 | * the user. There must be either one "%d" and no other "%" | |
688 | * characters. | |
689 | */ | |
690 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
691 | return -EINVAL; | |
692 | ||
693 | /* Use one page as a bit array of possible slots */ | |
694 | inuse = (long *) get_zeroed_page(GFP_ATOMIC); | |
695 | if (!inuse) | |
696 | return -ENOMEM; | |
697 | ||
7562f876 | 698 | for_each_netdev(d) { |
1da177e4 LT |
699 | if (!sscanf(d->name, name, &i)) |
700 | continue; | |
701 | if (i < 0 || i >= max_netdevices) | |
702 | continue; | |
703 | ||
704 | /* avoid cases where sscanf is not exact inverse of printf */ | |
705 | snprintf(buf, sizeof(buf), name, i); | |
706 | if (!strncmp(buf, d->name, IFNAMSIZ)) | |
707 | set_bit(i, inuse); | |
708 | } | |
709 | ||
710 | i = find_first_zero_bit(inuse, max_netdevices); | |
711 | free_page((unsigned long) inuse); | |
712 | } | |
713 | ||
714 | snprintf(buf, sizeof(buf), name, i); | |
715 | if (!__dev_get_by_name(buf)) { | |
716 | strlcpy(dev->name, buf, IFNAMSIZ); | |
717 | return i; | |
718 | } | |
719 | ||
720 | /* It is possible to run out of possible slots | |
721 | * when the name is long and there isn't enough space left | |
722 | * for the digits, or if all bits are used. | |
723 | */ | |
724 | return -ENFILE; | |
725 | } | |
726 | ||
727 | ||
728 | /** | |
729 | * dev_change_name - change name of a device | |
730 | * @dev: device | |
731 | * @newname: name (or format string) must be at least IFNAMSIZ | |
732 | * | |
733 | * Change name of a device, can pass format strings "eth%d". | |
734 | * for wildcarding. | |
735 | */ | |
736 | int dev_change_name(struct net_device *dev, char *newname) | |
737 | { | |
738 | int err = 0; | |
739 | ||
740 | ASSERT_RTNL(); | |
741 | ||
742 | if (dev->flags & IFF_UP) | |
743 | return -EBUSY; | |
744 | ||
745 | if (!dev_valid_name(newname)) | |
746 | return -EINVAL; | |
747 | ||
748 | if (strchr(newname, '%')) { | |
749 | err = dev_alloc_name(dev, newname); | |
750 | if (err < 0) | |
751 | return err; | |
752 | strcpy(newname, dev->name); | |
753 | } | |
754 | else if (__dev_get_by_name(newname)) | |
755 | return -EEXIST; | |
756 | else | |
757 | strlcpy(dev->name, newname, IFNAMSIZ); | |
758 | ||
92749821 EB |
759 | device_rename(&dev->dev, dev->name); |
760 | hlist_del(&dev->name_hlist); | |
761 | hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name)); | |
762 | raw_notifier_call_chain(&netdev_chain, NETDEV_CHANGENAME, dev); | |
1da177e4 LT |
763 | |
764 | return err; | |
765 | } | |
766 | ||
d8a33ac4 | 767 | /** |
3041a069 | 768 | * netdev_features_change - device changes features |
d8a33ac4 SH |
769 | * @dev: device to cause notification |
770 | * | |
771 | * Called to indicate a device has changed features. | |
772 | */ | |
773 | void netdev_features_change(struct net_device *dev) | |
774 | { | |
f07d5b94 | 775 | raw_notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
776 | } |
777 | EXPORT_SYMBOL(netdev_features_change); | |
778 | ||
1da177e4 LT |
779 | /** |
780 | * netdev_state_change - device changes state | |
781 | * @dev: device to cause notification | |
782 | * | |
783 | * Called to indicate a device has changed state. This function calls | |
784 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
785 | * to the routing socket. | |
786 | */ | |
787 | void netdev_state_change(struct net_device *dev) | |
788 | { | |
789 | if (dev->flags & IFF_UP) { | |
f07d5b94 | 790 | raw_notifier_call_chain(&netdev_chain, |
e041c683 | 791 | NETDEV_CHANGE, dev); |
1da177e4 LT |
792 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); |
793 | } | |
794 | } | |
795 | ||
796 | /** | |
797 | * dev_load - load a network module | |
798 | * @name: name of interface | |
799 | * | |
800 | * If a network interface is not present and the process has suitable | |
801 | * privileges this function loads the module. If module loading is not | |
802 | * available in this kernel then it becomes a nop. | |
803 | */ | |
804 | ||
805 | void dev_load(const char *name) | |
806 | { | |
4ec93edb | 807 | struct net_device *dev; |
1da177e4 LT |
808 | |
809 | read_lock(&dev_base_lock); | |
810 | dev = __dev_get_by_name(name); | |
811 | read_unlock(&dev_base_lock); | |
812 | ||
813 | if (!dev && capable(CAP_SYS_MODULE)) | |
814 | request_module("%s", name); | |
815 | } | |
816 | ||
817 | static int default_rebuild_header(struct sk_buff *skb) | |
818 | { | |
819 | printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n", | |
820 | skb->dev ? skb->dev->name : "NULL!!!"); | |
821 | kfree_skb(skb); | |
822 | return 1; | |
823 | } | |
824 | ||
1da177e4 LT |
825 | /** |
826 | * dev_open - prepare an interface for use. | |
827 | * @dev: device to open | |
828 | * | |
829 | * Takes a device from down to up state. The device's private open | |
830 | * function is invoked and then the multicast lists are loaded. Finally | |
831 | * the device is moved into the up state and a %NETDEV_UP message is | |
832 | * sent to the netdev notifier chain. | |
833 | * | |
834 | * Calling this function on an active interface is a nop. On a failure | |
835 | * a negative errno code is returned. | |
836 | */ | |
837 | int dev_open(struct net_device *dev) | |
838 | { | |
839 | int ret = 0; | |
840 | ||
841 | /* | |
842 | * Is it already up? | |
843 | */ | |
844 | ||
845 | if (dev->flags & IFF_UP) | |
846 | return 0; | |
847 | ||
848 | /* | |
849 | * Is it even present? | |
850 | */ | |
851 | if (!netif_device_present(dev)) | |
852 | return -ENODEV; | |
853 | ||
854 | /* | |
855 | * Call device private open method | |
856 | */ | |
857 | set_bit(__LINK_STATE_START, &dev->state); | |
858 | if (dev->open) { | |
859 | ret = dev->open(dev); | |
860 | if (ret) | |
861 | clear_bit(__LINK_STATE_START, &dev->state); | |
862 | } | |
863 | ||
4ec93edb | 864 | /* |
1da177e4 LT |
865 | * If it went open OK then: |
866 | */ | |
867 | ||
868 | if (!ret) { | |
869 | /* | |
870 | * Set the flags. | |
871 | */ | |
872 | dev->flags |= IFF_UP; | |
873 | ||
874 | /* | |
875 | * Initialize multicasting status | |
876 | */ | |
877 | dev_mc_upload(dev); | |
878 | ||
879 | /* | |
880 | * Wakeup transmit queue engine | |
881 | */ | |
882 | dev_activate(dev); | |
883 | ||
884 | /* | |
885 | * ... and announce new interface. | |
886 | */ | |
f07d5b94 | 887 | raw_notifier_call_chain(&netdev_chain, NETDEV_UP, dev); |
1da177e4 LT |
888 | } |
889 | return ret; | |
890 | } | |
891 | ||
892 | /** | |
893 | * dev_close - shutdown an interface. | |
894 | * @dev: device to shutdown | |
895 | * | |
896 | * This function moves an active device into down state. A | |
897 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
898 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
899 | * chain. | |
900 | */ | |
901 | int dev_close(struct net_device *dev) | |
902 | { | |
903 | if (!(dev->flags & IFF_UP)) | |
904 | return 0; | |
905 | ||
906 | /* | |
907 | * Tell people we are going down, so that they can | |
908 | * prepare to death, when device is still operating. | |
909 | */ | |
f07d5b94 | 910 | raw_notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev); |
1da177e4 LT |
911 | |
912 | dev_deactivate(dev); | |
913 | ||
914 | clear_bit(__LINK_STATE_START, &dev->state); | |
915 | ||
916 | /* Synchronize to scheduled poll. We cannot touch poll list, | |
917 | * it can be even on different cpu. So just clear netif_running(), | |
918 | * and wait when poll really will happen. Actually, the best place | |
919 | * for this is inside dev->stop() after device stopped its irq | |
920 | * engine, but this requires more changes in devices. */ | |
921 | ||
922 | smp_mb__after_clear_bit(); /* Commit netif_running(). */ | |
923 | while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) { | |
924 | /* No hurry. */ | |
6192b54b | 925 | msleep(1); |
1da177e4 LT |
926 | } |
927 | ||
928 | /* | |
929 | * Call the device specific close. This cannot fail. | |
930 | * Only if device is UP | |
931 | * | |
932 | * We allow it to be called even after a DETACH hot-plug | |
933 | * event. | |
934 | */ | |
935 | if (dev->stop) | |
936 | dev->stop(dev); | |
937 | ||
938 | /* | |
939 | * Device is now down. | |
940 | */ | |
941 | ||
942 | dev->flags &= ~IFF_UP; | |
943 | ||
944 | /* | |
945 | * Tell people we are down | |
946 | */ | |
f07d5b94 | 947 | raw_notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev); |
1da177e4 LT |
948 | |
949 | return 0; | |
950 | } | |
951 | ||
952 | ||
953 | /* | |
954 | * Device change register/unregister. These are not inline or static | |
955 | * as we export them to the world. | |
956 | */ | |
957 | ||
958 | /** | |
959 | * register_netdevice_notifier - register a network notifier block | |
960 | * @nb: notifier | |
961 | * | |
962 | * Register a notifier to be called when network device events occur. | |
963 | * The notifier passed is linked into the kernel structures and must | |
964 | * not be reused until it has been unregistered. A negative errno code | |
965 | * is returned on a failure. | |
966 | * | |
967 | * When registered all registration and up events are replayed | |
4ec93edb | 968 | * to the new notifier to allow device to have a race free |
1da177e4 LT |
969 | * view of the network device list. |
970 | */ | |
971 | ||
972 | int register_netdevice_notifier(struct notifier_block *nb) | |
973 | { | |
974 | struct net_device *dev; | |
975 | int err; | |
976 | ||
977 | rtnl_lock(); | |
f07d5b94 | 978 | err = raw_notifier_chain_register(&netdev_chain, nb); |
1da177e4 | 979 | if (!err) { |
7562f876 | 980 | for_each_netdev(dev) { |
1da177e4 LT |
981 | nb->notifier_call(nb, NETDEV_REGISTER, dev); |
982 | ||
4ec93edb | 983 | if (dev->flags & IFF_UP) |
1da177e4 LT |
984 | nb->notifier_call(nb, NETDEV_UP, dev); |
985 | } | |
986 | } | |
987 | rtnl_unlock(); | |
988 | return err; | |
989 | } | |
990 | ||
991 | /** | |
992 | * unregister_netdevice_notifier - unregister a network notifier block | |
993 | * @nb: notifier | |
994 | * | |
995 | * Unregister a notifier previously registered by | |
996 | * register_netdevice_notifier(). The notifier is unlinked into the | |
997 | * kernel structures and may then be reused. A negative errno code | |
998 | * is returned on a failure. | |
999 | */ | |
1000 | ||
1001 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1002 | { | |
9f514950 HX |
1003 | int err; |
1004 | ||
1005 | rtnl_lock(); | |
f07d5b94 | 1006 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
9f514950 HX |
1007 | rtnl_unlock(); |
1008 | return err; | |
1da177e4 LT |
1009 | } |
1010 | ||
1011 | /** | |
1012 | * call_netdevice_notifiers - call all network notifier blocks | |
1013 | * @val: value passed unmodified to notifier function | |
1014 | * @v: pointer passed unmodified to notifier function | |
1015 | * | |
1016 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 1017 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
1018 | */ |
1019 | ||
1020 | int call_netdevice_notifiers(unsigned long val, void *v) | |
1021 | { | |
f07d5b94 | 1022 | return raw_notifier_call_chain(&netdev_chain, val, v); |
1da177e4 LT |
1023 | } |
1024 | ||
1025 | /* When > 0 there are consumers of rx skb time stamps */ | |
1026 | static atomic_t netstamp_needed = ATOMIC_INIT(0); | |
1027 | ||
1028 | void net_enable_timestamp(void) | |
1029 | { | |
1030 | atomic_inc(&netstamp_needed); | |
1031 | } | |
1032 | ||
1033 | void net_disable_timestamp(void) | |
1034 | { | |
1035 | atomic_dec(&netstamp_needed); | |
1036 | } | |
1037 | ||
a61bbcf2 | 1038 | static inline void net_timestamp(struct sk_buff *skb) |
1da177e4 LT |
1039 | { |
1040 | if (atomic_read(&netstamp_needed)) | |
a61bbcf2 | 1041 | __net_timestamp(skb); |
b7aa0bf7 ED |
1042 | else |
1043 | skb->tstamp.tv64 = 0; | |
1da177e4 LT |
1044 | } |
1045 | ||
1046 | /* | |
1047 | * Support routine. Sends outgoing frames to any network | |
1048 | * taps currently in use. | |
1049 | */ | |
1050 | ||
f6a78bfc | 1051 | static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
1052 | { |
1053 | struct packet_type *ptype; | |
a61bbcf2 PM |
1054 | |
1055 | net_timestamp(skb); | |
1da177e4 LT |
1056 | |
1057 | rcu_read_lock(); | |
1058 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
1059 | /* Never send packets back to the socket | |
1060 | * they originated from - MvS (miquels@drinkel.ow.org) | |
1061 | */ | |
1062 | if ((ptype->dev == dev || !ptype->dev) && | |
1063 | (ptype->af_packet_priv == NULL || | |
1064 | (struct sock *)ptype->af_packet_priv != skb->sk)) { | |
1065 | struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC); | |
1066 | if (!skb2) | |
1067 | break; | |
1068 | ||
1069 | /* skb->nh should be correctly | |
1070 | set by sender, so that the second statement is | |
1071 | just protection against buggy protocols. | |
1072 | */ | |
459a98ed | 1073 | skb_reset_mac_header(skb2); |
1da177e4 | 1074 | |
d56f90a7 | 1075 | if (skb_network_header(skb2) < skb2->data || |
27a884dc | 1076 | skb2->network_header > skb2->tail) { |
1da177e4 LT |
1077 | if (net_ratelimit()) |
1078 | printk(KERN_CRIT "protocol %04x is " | |
1079 | "buggy, dev %s\n", | |
1080 | skb2->protocol, dev->name); | |
c1d2bbe1 | 1081 | skb_reset_network_header(skb2); |
1da177e4 LT |
1082 | } |
1083 | ||
b0e380b1 | 1084 | skb2->transport_header = skb2->network_header; |
1da177e4 | 1085 | skb2->pkt_type = PACKET_OUTGOING; |
f2ccd8fa | 1086 | ptype->func(skb2, skb->dev, ptype, skb->dev); |
1da177e4 LT |
1087 | } |
1088 | } | |
1089 | rcu_read_unlock(); | |
1090 | } | |
1091 | ||
56079431 DV |
1092 | |
1093 | void __netif_schedule(struct net_device *dev) | |
1094 | { | |
1095 | if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) { | |
1096 | unsigned long flags; | |
1097 | struct softnet_data *sd; | |
1098 | ||
1099 | local_irq_save(flags); | |
1100 | sd = &__get_cpu_var(softnet_data); | |
1101 | dev->next_sched = sd->output_queue; | |
1102 | sd->output_queue = dev; | |
1103 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
1104 | local_irq_restore(flags); | |
1105 | } | |
1106 | } | |
1107 | EXPORT_SYMBOL(__netif_schedule); | |
1108 | ||
1109 | void __netif_rx_schedule(struct net_device *dev) | |
1110 | { | |
1111 | unsigned long flags; | |
1112 | ||
1113 | local_irq_save(flags); | |
1114 | dev_hold(dev); | |
1115 | list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); | |
1116 | if (dev->quota < 0) | |
1117 | dev->quota += dev->weight; | |
1118 | else | |
1119 | dev->quota = dev->weight; | |
1120 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
1121 | local_irq_restore(flags); | |
1122 | } | |
1123 | EXPORT_SYMBOL(__netif_rx_schedule); | |
1124 | ||
1125 | void dev_kfree_skb_any(struct sk_buff *skb) | |
1126 | { | |
1127 | if (in_irq() || irqs_disabled()) | |
1128 | dev_kfree_skb_irq(skb); | |
1129 | else | |
1130 | dev_kfree_skb(skb); | |
1131 | } | |
1132 | EXPORT_SYMBOL(dev_kfree_skb_any); | |
1133 | ||
1134 | ||
1135 | /* Hot-plugging. */ | |
1136 | void netif_device_detach(struct net_device *dev) | |
1137 | { | |
1138 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
1139 | netif_running(dev)) { | |
1140 | netif_stop_queue(dev); | |
1141 | } | |
1142 | } | |
1143 | EXPORT_SYMBOL(netif_device_detach); | |
1144 | ||
1145 | void netif_device_attach(struct net_device *dev) | |
1146 | { | |
1147 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
1148 | netif_running(dev)) { | |
1149 | netif_wake_queue(dev); | |
4ec93edb | 1150 | __netdev_watchdog_up(dev); |
56079431 DV |
1151 | } |
1152 | } | |
1153 | EXPORT_SYMBOL(netif_device_attach); | |
1154 | ||
1155 | ||
1da177e4 LT |
1156 | /* |
1157 | * Invalidate hardware checksum when packet is to be mangled, and | |
1158 | * complete checksum manually on outgoing path. | |
1159 | */ | |
84fa7933 | 1160 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 1161 | { |
d3bc23e7 | 1162 | __wsum csum; |
663ead3b | 1163 | int ret = 0, offset; |
1da177e4 | 1164 | |
84fa7933 | 1165 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
1166 | goto out_set_summed; |
1167 | ||
1168 | if (unlikely(skb_shinfo(skb)->gso_size)) { | |
a430a43d HX |
1169 | /* Let GSO fix up the checksum. */ |
1170 | goto out_set_summed; | |
1da177e4 LT |
1171 | } |
1172 | ||
1173 | if (skb_cloned(skb)) { | |
1174 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); | |
1175 | if (ret) | |
1176 | goto out; | |
1177 | } | |
1178 | ||
663ead3b | 1179 | offset = skb->csum_start - skb_headroom(skb); |
09a62660 | 1180 | BUG_ON(offset > (int)skb->len); |
1da177e4 LT |
1181 | csum = skb_checksum(skb, offset, skb->len-offset, 0); |
1182 | ||
663ead3b | 1183 | offset = skb_headlen(skb) - offset; |
09a62660 | 1184 | BUG_ON(offset <= 0); |
ff1dcadb | 1185 | BUG_ON(skb->csum_offset + 2 > offset); |
1da177e4 | 1186 | |
663ead3b HX |
1187 | *(__sum16 *)(skb->head + skb->csum_start + skb->csum_offset) = |
1188 | csum_fold(csum); | |
a430a43d | 1189 | out_set_summed: |
1da177e4 | 1190 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 1191 | out: |
1da177e4 LT |
1192 | return ret; |
1193 | } | |
1194 | ||
f6a78bfc HX |
1195 | /** |
1196 | * skb_gso_segment - Perform segmentation on skb. | |
1197 | * @skb: buffer to segment | |
576a30eb | 1198 | * @features: features for the output path (see dev->features) |
f6a78bfc HX |
1199 | * |
1200 | * This function segments the given skb and returns a list of segments. | |
576a30eb HX |
1201 | * |
1202 | * It may return NULL if the skb requires no segmentation. This is | |
1203 | * only possible when GSO is used for verifying header integrity. | |
f6a78bfc | 1204 | */ |
576a30eb | 1205 | struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features) |
f6a78bfc HX |
1206 | { |
1207 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
1208 | struct packet_type *ptype; | |
252e3346 | 1209 | __be16 type = skb->protocol; |
a430a43d | 1210 | int err; |
f6a78bfc HX |
1211 | |
1212 | BUG_ON(skb_shinfo(skb)->frag_list); | |
f6a78bfc | 1213 | |
459a98ed | 1214 | skb_reset_mac_header(skb); |
b0e380b1 | 1215 | skb->mac_len = skb->network_header - skb->mac_header; |
f6a78bfc HX |
1216 | __skb_pull(skb, skb->mac_len); |
1217 | ||
f9d106a6 | 1218 | if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) { |
a430a43d HX |
1219 | if (skb_header_cloned(skb) && |
1220 | (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) | |
1221 | return ERR_PTR(err); | |
1222 | } | |
1223 | ||
f6a78bfc HX |
1224 | rcu_read_lock(); |
1225 | list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type) & 15], list) { | |
1226 | if (ptype->type == type && !ptype->dev && ptype->gso_segment) { | |
84fa7933 | 1227 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
a430a43d HX |
1228 | err = ptype->gso_send_check(skb); |
1229 | segs = ERR_PTR(err); | |
1230 | if (err || skb_gso_ok(skb, features)) | |
1231 | break; | |
d56f90a7 ACM |
1232 | __skb_push(skb, (skb->data - |
1233 | skb_network_header(skb))); | |
a430a43d | 1234 | } |
576a30eb | 1235 | segs = ptype->gso_segment(skb, features); |
f6a78bfc HX |
1236 | break; |
1237 | } | |
1238 | } | |
1239 | rcu_read_unlock(); | |
1240 | ||
98e399f8 | 1241 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 1242 | |
f6a78bfc HX |
1243 | return segs; |
1244 | } | |
1245 | ||
1246 | EXPORT_SYMBOL(skb_gso_segment); | |
1247 | ||
fb286bb2 HX |
1248 | /* Take action when hardware reception checksum errors are detected. */ |
1249 | #ifdef CONFIG_BUG | |
1250 | void netdev_rx_csum_fault(struct net_device *dev) | |
1251 | { | |
1252 | if (net_ratelimit()) { | |
4ec93edb | 1253 | printk(KERN_ERR "%s: hw csum failure.\n", |
246a4212 | 1254 | dev ? dev->name : "<unknown>"); |
fb286bb2 HX |
1255 | dump_stack(); |
1256 | } | |
1257 | } | |
1258 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
1259 | #endif | |
1260 | ||
1da177e4 LT |
1261 | /* Actually, we should eliminate this check as soon as we know, that: |
1262 | * 1. IOMMU is present and allows to map all the memory. | |
1263 | * 2. No high memory really exists on this machine. | |
1264 | */ | |
1265 | ||
1266 | static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb) | |
1267 | { | |
3d3a8533 | 1268 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
1269 | int i; |
1270 | ||
1271 | if (dev->features & NETIF_F_HIGHDMA) | |
1272 | return 0; | |
1273 | ||
1274 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) | |
1275 | if (PageHighMem(skb_shinfo(skb)->frags[i].page)) | |
1276 | return 1; | |
1277 | ||
3d3a8533 | 1278 | #endif |
1da177e4 LT |
1279 | return 0; |
1280 | } | |
1da177e4 | 1281 | |
f6a78bfc HX |
1282 | struct dev_gso_cb { |
1283 | void (*destructor)(struct sk_buff *skb); | |
1284 | }; | |
1285 | ||
1286 | #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) | |
1287 | ||
1288 | static void dev_gso_skb_destructor(struct sk_buff *skb) | |
1289 | { | |
1290 | struct dev_gso_cb *cb; | |
1291 | ||
1292 | do { | |
1293 | struct sk_buff *nskb = skb->next; | |
1294 | ||
1295 | skb->next = nskb->next; | |
1296 | nskb->next = NULL; | |
1297 | kfree_skb(nskb); | |
1298 | } while (skb->next); | |
1299 | ||
1300 | cb = DEV_GSO_CB(skb); | |
1301 | if (cb->destructor) | |
1302 | cb->destructor(skb); | |
1303 | } | |
1304 | ||
1305 | /** | |
1306 | * dev_gso_segment - Perform emulated hardware segmentation on skb. | |
1307 | * @skb: buffer to segment | |
1308 | * | |
1309 | * This function segments the given skb and stores the list of segments | |
1310 | * in skb->next. | |
1311 | */ | |
1312 | static int dev_gso_segment(struct sk_buff *skb) | |
1313 | { | |
1314 | struct net_device *dev = skb->dev; | |
1315 | struct sk_buff *segs; | |
576a30eb HX |
1316 | int features = dev->features & ~(illegal_highdma(dev, skb) ? |
1317 | NETIF_F_SG : 0); | |
1318 | ||
1319 | segs = skb_gso_segment(skb, features); | |
1320 | ||
1321 | /* Verifying header integrity only. */ | |
1322 | if (!segs) | |
1323 | return 0; | |
f6a78bfc | 1324 | |
f6a78bfc HX |
1325 | if (unlikely(IS_ERR(segs))) |
1326 | return PTR_ERR(segs); | |
1327 | ||
1328 | skb->next = segs; | |
1329 | DEV_GSO_CB(skb)->destructor = skb->destructor; | |
1330 | skb->destructor = dev_gso_skb_destructor; | |
1331 | ||
1332 | return 0; | |
1333 | } | |
1334 | ||
1335 | int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
1336 | { | |
1337 | if (likely(!skb->next)) { | |
9be9a6b9 | 1338 | if (!list_empty(&ptype_all)) |
f6a78bfc HX |
1339 | dev_queue_xmit_nit(skb, dev); |
1340 | ||
576a30eb HX |
1341 | if (netif_needs_gso(dev, skb)) { |
1342 | if (unlikely(dev_gso_segment(skb))) | |
1343 | goto out_kfree_skb; | |
1344 | if (skb->next) | |
1345 | goto gso; | |
1346 | } | |
f6a78bfc | 1347 | |
576a30eb | 1348 | return dev->hard_start_xmit(skb, dev); |
f6a78bfc HX |
1349 | } |
1350 | ||
576a30eb | 1351 | gso: |
f6a78bfc HX |
1352 | do { |
1353 | struct sk_buff *nskb = skb->next; | |
1354 | int rc; | |
1355 | ||
1356 | skb->next = nskb->next; | |
1357 | nskb->next = NULL; | |
1358 | rc = dev->hard_start_xmit(nskb, dev); | |
1359 | if (unlikely(rc)) { | |
f54d9e8d | 1360 | nskb->next = skb->next; |
f6a78bfc HX |
1361 | skb->next = nskb; |
1362 | return rc; | |
1363 | } | |
f54d9e8d MC |
1364 | if (unlikely(netif_queue_stopped(dev) && skb->next)) |
1365 | return NETDEV_TX_BUSY; | |
f6a78bfc | 1366 | } while (skb->next); |
4ec93edb | 1367 | |
f6a78bfc HX |
1368 | skb->destructor = DEV_GSO_CB(skb)->destructor; |
1369 | ||
1370 | out_kfree_skb: | |
1371 | kfree_skb(skb); | |
1372 | return 0; | |
1373 | } | |
1374 | ||
1da177e4 LT |
1375 | #define HARD_TX_LOCK(dev, cpu) { \ |
1376 | if ((dev->features & NETIF_F_LLTX) == 0) { \ | |
932ff279 | 1377 | netif_tx_lock(dev); \ |
1da177e4 LT |
1378 | } \ |
1379 | } | |
1380 | ||
1381 | #define HARD_TX_UNLOCK(dev) { \ | |
1382 | if ((dev->features & NETIF_F_LLTX) == 0) { \ | |
932ff279 | 1383 | netif_tx_unlock(dev); \ |
1da177e4 LT |
1384 | } \ |
1385 | } | |
1386 | ||
1387 | /** | |
1388 | * dev_queue_xmit - transmit a buffer | |
1389 | * @skb: buffer to transmit | |
1390 | * | |
1391 | * Queue a buffer for transmission to a network device. The caller must | |
1392 | * have set the device and priority and built the buffer before calling | |
1393 | * this function. The function can be called from an interrupt. | |
1394 | * | |
1395 | * A negative errno code is returned on a failure. A success does not | |
1396 | * guarantee the frame will be transmitted as it may be dropped due | |
1397 | * to congestion or traffic shaping. | |
af191367 BG |
1398 | * |
1399 | * ----------------------------------------------------------------------------------- | |
1400 | * I notice this method can also return errors from the queue disciplines, | |
1401 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
1402 | * be positive. | |
1403 | * | |
1404 | * Regardless of the return value, the skb is consumed, so it is currently | |
1405 | * difficult to retry a send to this method. (You can bump the ref count | |
1406 | * before sending to hold a reference for retry if you are careful.) | |
1407 | * | |
1408 | * When calling this method, interrupts MUST be enabled. This is because | |
1409 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
1410 | * --BLG | |
1da177e4 LT |
1411 | */ |
1412 | ||
1413 | int dev_queue_xmit(struct sk_buff *skb) | |
1414 | { | |
1415 | struct net_device *dev = skb->dev; | |
1416 | struct Qdisc *q; | |
1417 | int rc = -ENOMEM; | |
1418 | ||
f6a78bfc HX |
1419 | /* GSO will handle the following emulations directly. */ |
1420 | if (netif_needs_gso(dev, skb)) | |
1421 | goto gso; | |
1422 | ||
1da177e4 LT |
1423 | if (skb_shinfo(skb)->frag_list && |
1424 | !(dev->features & NETIF_F_FRAGLIST) && | |
364c6bad | 1425 | __skb_linearize(skb)) |
1da177e4 LT |
1426 | goto out_kfree_skb; |
1427 | ||
1428 | /* Fragmented skb is linearized if device does not support SG, | |
1429 | * or if at least one of fragments is in highmem and device | |
1430 | * does not support DMA from it. | |
1431 | */ | |
1432 | if (skb_shinfo(skb)->nr_frags && | |
1433 | (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) && | |
364c6bad | 1434 | __skb_linearize(skb)) |
1da177e4 LT |
1435 | goto out_kfree_skb; |
1436 | ||
1437 | /* If packet is not checksummed and device does not support | |
1438 | * checksumming for this protocol, complete checksumming here. | |
1439 | */ | |
663ead3b HX |
1440 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1441 | skb_set_transport_header(skb, skb->csum_start - | |
1442 | skb_headroom(skb)); | |
1443 | ||
1444 | if (!(dev->features & NETIF_F_GEN_CSUM) && | |
1445 | (!(dev->features & NETIF_F_IP_CSUM) || | |
1446 | skb->protocol != htons(ETH_P_IP))) | |
1447 | if (skb_checksum_help(skb)) | |
1448 | goto out_kfree_skb; | |
1449 | } | |
1da177e4 | 1450 | |
f6a78bfc | 1451 | gso: |
2d7ceece ED |
1452 | spin_lock_prefetch(&dev->queue_lock); |
1453 | ||
4ec93edb YH |
1454 | /* Disable soft irqs for various locks below. Also |
1455 | * stops preemption for RCU. | |
1da177e4 | 1456 | */ |
4ec93edb | 1457 | rcu_read_lock_bh(); |
1da177e4 | 1458 | |
4ec93edb YH |
1459 | /* Updates of qdisc are serialized by queue_lock. |
1460 | * The struct Qdisc which is pointed to by qdisc is now a | |
1461 | * rcu structure - it may be accessed without acquiring | |
1da177e4 | 1462 | * a lock (but the structure may be stale.) The freeing of the |
4ec93edb | 1463 | * qdisc will be deferred until it's known that there are no |
1da177e4 | 1464 | * more references to it. |
4ec93edb YH |
1465 | * |
1466 | * If the qdisc has an enqueue function, we still need to | |
1da177e4 LT |
1467 | * hold the queue_lock before calling it, since queue_lock |
1468 | * also serializes access to the device queue. | |
1469 | */ | |
1470 | ||
1471 | q = rcu_dereference(dev->qdisc); | |
1472 | #ifdef CONFIG_NET_CLS_ACT | |
1473 | skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS); | |
1474 | #endif | |
1475 | if (q->enqueue) { | |
1476 | /* Grab device queue */ | |
1477 | spin_lock(&dev->queue_lock); | |
85670cc1 PM |
1478 | q = dev->qdisc; |
1479 | if (q->enqueue) { | |
1480 | rc = q->enqueue(skb, q); | |
1481 | qdisc_run(dev); | |
1482 | spin_unlock(&dev->queue_lock); | |
1da177e4 | 1483 | |
85670cc1 PM |
1484 | rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc; |
1485 | goto out; | |
1486 | } | |
1da177e4 | 1487 | spin_unlock(&dev->queue_lock); |
1da177e4 LT |
1488 | } |
1489 | ||
1490 | /* The device has no queue. Common case for software devices: | |
1491 | loopback, all the sorts of tunnels... | |
1492 | ||
932ff279 HX |
1493 | Really, it is unlikely that netif_tx_lock protection is necessary |
1494 | here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
1da177e4 LT |
1495 | counters.) |
1496 | However, it is possible, that they rely on protection | |
1497 | made by us here. | |
1498 | ||
1499 | Check this and shot the lock. It is not prone from deadlocks. | |
1500 | Either shot noqueue qdisc, it is even simpler 8) | |
1501 | */ | |
1502 | if (dev->flags & IFF_UP) { | |
1503 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
1504 | ||
1505 | if (dev->xmit_lock_owner != cpu) { | |
1506 | ||
1507 | HARD_TX_LOCK(dev, cpu); | |
1508 | ||
1509 | if (!netif_queue_stopped(dev)) { | |
1da177e4 | 1510 | rc = 0; |
f6a78bfc | 1511 | if (!dev_hard_start_xmit(skb, dev)) { |
1da177e4 LT |
1512 | HARD_TX_UNLOCK(dev); |
1513 | goto out; | |
1514 | } | |
1515 | } | |
1516 | HARD_TX_UNLOCK(dev); | |
1517 | if (net_ratelimit()) | |
1518 | printk(KERN_CRIT "Virtual device %s asks to " | |
1519 | "queue packet!\n", dev->name); | |
1520 | } else { | |
1521 | /* Recursion is detected! It is possible, | |
1522 | * unfortunately */ | |
1523 | if (net_ratelimit()) | |
1524 | printk(KERN_CRIT "Dead loop on virtual device " | |
1525 | "%s, fix it urgently!\n", dev->name); | |
1526 | } | |
1527 | } | |
1528 | ||
1529 | rc = -ENETDOWN; | |
d4828d85 | 1530 | rcu_read_unlock_bh(); |
1da177e4 LT |
1531 | |
1532 | out_kfree_skb: | |
1533 | kfree_skb(skb); | |
1534 | return rc; | |
1535 | out: | |
d4828d85 | 1536 | rcu_read_unlock_bh(); |
1da177e4 LT |
1537 | return rc; |
1538 | } | |
1539 | ||
1540 | ||
1541 | /*======================================================================= | |
1542 | Receiver routines | |
1543 | =======================================================================*/ | |
1544 | ||
6b2bedc3 SH |
1545 | int netdev_max_backlog __read_mostly = 1000; |
1546 | int netdev_budget __read_mostly = 300; | |
1547 | int weight_p __read_mostly = 64; /* old backlog weight */ | |
1da177e4 LT |
1548 | |
1549 | DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, }; | |
1550 | ||
1551 | ||
1da177e4 LT |
1552 | /** |
1553 | * netif_rx - post buffer to the network code | |
1554 | * @skb: buffer to post | |
1555 | * | |
1556 | * This function receives a packet from a device driver and queues it for | |
1557 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
1558 | * may be dropped during processing for congestion control or by the | |
1559 | * protocol layers. | |
1560 | * | |
1561 | * return values: | |
1562 | * NET_RX_SUCCESS (no congestion) | |
1563 | * NET_RX_CN_LOW (low congestion) | |
1564 | * NET_RX_CN_MOD (moderate congestion) | |
1565 | * NET_RX_CN_HIGH (high congestion) | |
1566 | * NET_RX_DROP (packet was dropped) | |
1567 | * | |
1568 | */ | |
1569 | ||
1570 | int netif_rx(struct sk_buff *skb) | |
1571 | { | |
1da177e4 LT |
1572 | struct softnet_data *queue; |
1573 | unsigned long flags; | |
1574 | ||
1575 | /* if netpoll wants it, pretend we never saw it */ | |
1576 | if (netpoll_rx(skb)) | |
1577 | return NET_RX_DROP; | |
1578 | ||
b7aa0bf7 | 1579 | if (!skb->tstamp.tv64) |
a61bbcf2 | 1580 | net_timestamp(skb); |
1da177e4 LT |
1581 | |
1582 | /* | |
1583 | * The code is rearranged so that the path is the most | |
1584 | * short when CPU is congested, but is still operating. | |
1585 | */ | |
1586 | local_irq_save(flags); | |
1da177e4 LT |
1587 | queue = &__get_cpu_var(softnet_data); |
1588 | ||
1589 | __get_cpu_var(netdev_rx_stat).total++; | |
1590 | if (queue->input_pkt_queue.qlen <= netdev_max_backlog) { | |
1591 | if (queue->input_pkt_queue.qlen) { | |
1da177e4 LT |
1592 | enqueue: |
1593 | dev_hold(skb->dev); | |
1594 | __skb_queue_tail(&queue->input_pkt_queue, skb); | |
1da177e4 | 1595 | local_irq_restore(flags); |
34008d8c | 1596 | return NET_RX_SUCCESS; |
1da177e4 LT |
1597 | } |
1598 | ||
1da177e4 LT |
1599 | netif_rx_schedule(&queue->backlog_dev); |
1600 | goto enqueue; | |
1601 | } | |
1602 | ||
1da177e4 LT |
1603 | __get_cpu_var(netdev_rx_stat).dropped++; |
1604 | local_irq_restore(flags); | |
1605 | ||
1606 | kfree_skb(skb); | |
1607 | return NET_RX_DROP; | |
1608 | } | |
1609 | ||
1610 | int netif_rx_ni(struct sk_buff *skb) | |
1611 | { | |
1612 | int err; | |
1613 | ||
1614 | preempt_disable(); | |
1615 | err = netif_rx(skb); | |
1616 | if (local_softirq_pending()) | |
1617 | do_softirq(); | |
1618 | preempt_enable(); | |
1619 | ||
1620 | return err; | |
1621 | } | |
1622 | ||
1623 | EXPORT_SYMBOL(netif_rx_ni); | |
1624 | ||
f2ccd8fa | 1625 | static inline struct net_device *skb_bond(struct sk_buff *skb) |
1da177e4 LT |
1626 | { |
1627 | struct net_device *dev = skb->dev; | |
1628 | ||
8f903c70 | 1629 | if (dev->master) { |
7ea49ed7 | 1630 | if (skb_bond_should_drop(skb)) { |
8f903c70 JV |
1631 | kfree_skb(skb); |
1632 | return NULL; | |
1633 | } | |
1da177e4 | 1634 | skb->dev = dev->master; |
8f903c70 | 1635 | } |
f2ccd8fa DM |
1636 | |
1637 | return dev; | |
1da177e4 LT |
1638 | } |
1639 | ||
1640 | static void net_tx_action(struct softirq_action *h) | |
1641 | { | |
1642 | struct softnet_data *sd = &__get_cpu_var(softnet_data); | |
1643 | ||
1644 | if (sd->completion_queue) { | |
1645 | struct sk_buff *clist; | |
1646 | ||
1647 | local_irq_disable(); | |
1648 | clist = sd->completion_queue; | |
1649 | sd->completion_queue = NULL; | |
1650 | local_irq_enable(); | |
1651 | ||
1652 | while (clist) { | |
1653 | struct sk_buff *skb = clist; | |
1654 | clist = clist->next; | |
1655 | ||
1656 | BUG_TRAP(!atomic_read(&skb->users)); | |
1657 | __kfree_skb(skb); | |
1658 | } | |
1659 | } | |
1660 | ||
1661 | if (sd->output_queue) { | |
1662 | struct net_device *head; | |
1663 | ||
1664 | local_irq_disable(); | |
1665 | head = sd->output_queue; | |
1666 | sd->output_queue = NULL; | |
1667 | local_irq_enable(); | |
1668 | ||
1669 | while (head) { | |
1670 | struct net_device *dev = head; | |
1671 | head = head->next_sched; | |
1672 | ||
1673 | smp_mb__before_clear_bit(); | |
1674 | clear_bit(__LINK_STATE_SCHED, &dev->state); | |
1675 | ||
1676 | if (spin_trylock(&dev->queue_lock)) { | |
1677 | qdisc_run(dev); | |
1678 | spin_unlock(&dev->queue_lock); | |
1679 | } else { | |
1680 | netif_schedule(dev); | |
1681 | } | |
1682 | } | |
1683 | } | |
1684 | } | |
1685 | ||
6f05f629 SH |
1686 | static inline int deliver_skb(struct sk_buff *skb, |
1687 | struct packet_type *pt_prev, | |
1688 | struct net_device *orig_dev) | |
1da177e4 LT |
1689 | { |
1690 | atomic_inc(&skb->users); | |
f2ccd8fa | 1691 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
1da177e4 LT |
1692 | } |
1693 | ||
1694 | #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE) | |
6229e362 | 1695 | /* These hooks defined here for ATM */ |
1da177e4 LT |
1696 | struct net_bridge; |
1697 | struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br, | |
1698 | unsigned char *addr); | |
6229e362 | 1699 | void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly; |
1da177e4 | 1700 | |
6229e362 SH |
1701 | /* |
1702 | * If bridge module is loaded call bridging hook. | |
1703 | * returns NULL if packet was consumed. | |
1704 | */ | |
1705 | struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p, | |
1706 | struct sk_buff *skb) __read_mostly; | |
1707 | static inline struct sk_buff *handle_bridge(struct sk_buff *skb, | |
1708 | struct packet_type **pt_prev, int *ret, | |
1709 | struct net_device *orig_dev) | |
1da177e4 LT |
1710 | { |
1711 | struct net_bridge_port *port; | |
1712 | ||
6229e362 SH |
1713 | if (skb->pkt_type == PACKET_LOOPBACK || |
1714 | (port = rcu_dereference(skb->dev->br_port)) == NULL) | |
1715 | return skb; | |
1da177e4 LT |
1716 | |
1717 | if (*pt_prev) { | |
6229e362 | 1718 | *ret = deliver_skb(skb, *pt_prev, orig_dev); |
1da177e4 | 1719 | *pt_prev = NULL; |
4ec93edb YH |
1720 | } |
1721 | ||
6229e362 | 1722 | return br_handle_frame_hook(port, skb); |
1da177e4 LT |
1723 | } |
1724 | #else | |
6229e362 | 1725 | #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb) |
1da177e4 LT |
1726 | #endif |
1727 | ||
1728 | #ifdef CONFIG_NET_CLS_ACT | |
1729 | /* TODO: Maybe we should just force sch_ingress to be compiled in | |
1730 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions | |
1731 | * a compare and 2 stores extra right now if we dont have it on | |
1732 | * but have CONFIG_NET_CLS_ACT | |
4ec93edb | 1733 | * NOTE: This doesnt stop any functionality; if you dont have |
1da177e4 LT |
1734 | * the ingress scheduler, you just cant add policies on ingress. |
1735 | * | |
1736 | */ | |
4ec93edb | 1737 | static int ing_filter(struct sk_buff *skb) |
1da177e4 LT |
1738 | { |
1739 | struct Qdisc *q; | |
1740 | struct net_device *dev = skb->dev; | |
1741 | int result = TC_ACT_OK; | |
4ec93edb | 1742 | |
1da177e4 LT |
1743 | if (dev->qdisc_ingress) { |
1744 | __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd); | |
1745 | if (MAX_RED_LOOP < ttl++) { | |
c01003c2 PM |
1746 | printk(KERN_WARNING "Redir loop detected Dropping packet (%d->%d)\n", |
1747 | skb->iif, skb->dev->ifindex); | |
1da177e4 LT |
1748 | return TC_ACT_SHOT; |
1749 | } | |
1750 | ||
1751 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl); | |
1752 | ||
1753 | skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS); | |
86e65da9 | 1754 | |
fd44de7c | 1755 | spin_lock(&dev->ingress_lock); |
1da177e4 LT |
1756 | if ((q = dev->qdisc_ingress) != NULL) |
1757 | result = q->enqueue(skb, q); | |
fd44de7c | 1758 | spin_unlock(&dev->ingress_lock); |
1da177e4 LT |
1759 | |
1760 | } | |
1761 | ||
1762 | return result; | |
1763 | } | |
1764 | #endif | |
1765 | ||
1766 | int netif_receive_skb(struct sk_buff *skb) | |
1767 | { | |
1768 | struct packet_type *ptype, *pt_prev; | |
f2ccd8fa | 1769 | struct net_device *orig_dev; |
1da177e4 | 1770 | int ret = NET_RX_DROP; |
252e3346 | 1771 | __be16 type; |
1da177e4 LT |
1772 | |
1773 | /* if we've gotten here through NAPI, check netpoll */ | |
1774 | if (skb->dev->poll && netpoll_rx(skb)) | |
1775 | return NET_RX_DROP; | |
1776 | ||
b7aa0bf7 | 1777 | if (!skb->tstamp.tv64) |
a61bbcf2 | 1778 | net_timestamp(skb); |
1da177e4 | 1779 | |
c01003c2 PM |
1780 | if (!skb->iif) |
1781 | skb->iif = skb->dev->ifindex; | |
86e65da9 | 1782 | |
f2ccd8fa | 1783 | orig_dev = skb_bond(skb); |
1da177e4 | 1784 | |
8f903c70 JV |
1785 | if (!orig_dev) |
1786 | return NET_RX_DROP; | |
1787 | ||
1da177e4 LT |
1788 | __get_cpu_var(netdev_rx_stat).total++; |
1789 | ||
c1d2bbe1 | 1790 | skb_reset_network_header(skb); |
badff6d0 | 1791 | skb_reset_transport_header(skb); |
b0e380b1 | 1792 | skb->mac_len = skb->network_header - skb->mac_header; |
1da177e4 LT |
1793 | |
1794 | pt_prev = NULL; | |
1795 | ||
1796 | rcu_read_lock(); | |
1797 | ||
1798 | #ifdef CONFIG_NET_CLS_ACT | |
1799 | if (skb->tc_verd & TC_NCLS) { | |
1800 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1801 | goto ncls; | |
1802 | } | |
1803 | #endif | |
1804 | ||
1805 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
1806 | if (!ptype->dev || ptype->dev == skb->dev) { | |
4ec93edb | 1807 | if (pt_prev) |
f2ccd8fa | 1808 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
1809 | pt_prev = ptype; |
1810 | } | |
1811 | } | |
1812 | ||
1813 | #ifdef CONFIG_NET_CLS_ACT | |
1814 | if (pt_prev) { | |
f2ccd8fa | 1815 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
1816 | pt_prev = NULL; /* noone else should process this after*/ |
1817 | } else { | |
1818 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
1819 | } | |
1820 | ||
1821 | ret = ing_filter(skb); | |
1822 | ||
1823 | if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) { | |
1824 | kfree_skb(skb); | |
1825 | goto out; | |
1826 | } | |
1827 | ||
1828 | skb->tc_verd = 0; | |
1829 | ncls: | |
1830 | #endif | |
1831 | ||
6229e362 SH |
1832 | skb = handle_bridge(skb, &pt_prev, &ret, orig_dev); |
1833 | if (!skb) | |
1da177e4 LT |
1834 | goto out; |
1835 | ||
1836 | type = skb->protocol; | |
1837 | list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) { | |
1838 | if (ptype->type == type && | |
1839 | (!ptype->dev || ptype->dev == skb->dev)) { | |
4ec93edb | 1840 | if (pt_prev) |
f2ccd8fa | 1841 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
1842 | pt_prev = ptype; |
1843 | } | |
1844 | } | |
1845 | ||
1846 | if (pt_prev) { | |
f2ccd8fa | 1847 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
1da177e4 LT |
1848 | } else { |
1849 | kfree_skb(skb); | |
1850 | /* Jamal, now you will not able to escape explaining | |
1851 | * me how you were going to use this. :-) | |
1852 | */ | |
1853 | ret = NET_RX_DROP; | |
1854 | } | |
1855 | ||
1856 | out: | |
1857 | rcu_read_unlock(); | |
1858 | return ret; | |
1859 | } | |
1860 | ||
1861 | static int process_backlog(struct net_device *backlog_dev, int *budget) | |
1862 | { | |
1863 | int work = 0; | |
1864 | int quota = min(backlog_dev->quota, *budget); | |
1865 | struct softnet_data *queue = &__get_cpu_var(softnet_data); | |
1866 | unsigned long start_time = jiffies; | |
1867 | ||
e3876605 | 1868 | backlog_dev->weight = weight_p; |
1da177e4 LT |
1869 | for (;;) { |
1870 | struct sk_buff *skb; | |
1871 | struct net_device *dev; | |
1872 | ||
1873 | local_irq_disable(); | |
1874 | skb = __skb_dequeue(&queue->input_pkt_queue); | |
1875 | if (!skb) | |
1876 | goto job_done; | |
1877 | local_irq_enable(); | |
1878 | ||
1879 | dev = skb->dev; | |
1880 | ||
1881 | netif_receive_skb(skb); | |
1882 | ||
1883 | dev_put(dev); | |
1884 | ||
1885 | work++; | |
1886 | ||
1887 | if (work >= quota || jiffies - start_time > 1) | |
1888 | break; | |
1889 | ||
1890 | } | |
1891 | ||
1892 | backlog_dev->quota -= work; | |
1893 | *budget -= work; | |
1894 | return -1; | |
1895 | ||
1896 | job_done: | |
1897 | backlog_dev->quota -= work; | |
1898 | *budget -= work; | |
1899 | ||
1900 | list_del(&backlog_dev->poll_list); | |
1901 | smp_mb__before_clear_bit(); | |
1902 | netif_poll_enable(backlog_dev); | |
1903 | ||
1da177e4 LT |
1904 | local_irq_enable(); |
1905 | return 0; | |
1906 | } | |
1907 | ||
1908 | static void net_rx_action(struct softirq_action *h) | |
1909 | { | |
1910 | struct softnet_data *queue = &__get_cpu_var(softnet_data); | |
1911 | unsigned long start_time = jiffies; | |
51b0bded | 1912 | int budget = netdev_budget; |
53fb95d3 MM |
1913 | void *have; |
1914 | ||
1da177e4 LT |
1915 | local_irq_disable(); |
1916 | ||
1917 | while (!list_empty(&queue->poll_list)) { | |
1918 | struct net_device *dev; | |
1919 | ||
1920 | if (budget <= 0 || jiffies - start_time > 1) | |
1921 | goto softnet_break; | |
1922 | ||
1923 | local_irq_enable(); | |
1924 | ||
1925 | dev = list_entry(queue->poll_list.next, | |
1926 | struct net_device, poll_list); | |
53fb95d3 | 1927 | have = netpoll_poll_lock(dev); |
1da177e4 LT |
1928 | |
1929 | if (dev->quota <= 0 || dev->poll(dev, &budget)) { | |
53fb95d3 | 1930 | netpoll_poll_unlock(have); |
1da177e4 | 1931 | local_irq_disable(); |
8aca8a27 | 1932 | list_move_tail(&dev->poll_list, &queue->poll_list); |
1da177e4 LT |
1933 | if (dev->quota < 0) |
1934 | dev->quota += dev->weight; | |
1935 | else | |
1936 | dev->quota = dev->weight; | |
1937 | } else { | |
53fb95d3 | 1938 | netpoll_poll_unlock(have); |
1da177e4 LT |
1939 | dev_put(dev); |
1940 | local_irq_disable(); | |
1941 | } | |
1942 | } | |
1943 | out: | |
db217334 CL |
1944 | #ifdef CONFIG_NET_DMA |
1945 | /* | |
1946 | * There may not be any more sk_buffs coming right now, so push | |
1947 | * any pending DMA copies to hardware | |
1948 | */ | |
1949 | if (net_dma_client) { | |
1950 | struct dma_chan *chan; | |
1951 | rcu_read_lock(); | |
1952 | list_for_each_entry_rcu(chan, &net_dma_client->channels, client_node) | |
1953 | dma_async_memcpy_issue_pending(chan); | |
1954 | rcu_read_unlock(); | |
1955 | } | |
1956 | #endif | |
1da177e4 LT |
1957 | local_irq_enable(); |
1958 | return; | |
1959 | ||
1960 | softnet_break: | |
1961 | __get_cpu_var(netdev_rx_stat).time_squeeze++; | |
1962 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
1963 | goto out; | |
1964 | } | |
1965 | ||
1966 | static gifconf_func_t * gifconf_list [NPROTO]; | |
1967 | ||
1968 | /** | |
1969 | * register_gifconf - register a SIOCGIF handler | |
1970 | * @family: Address family | |
1971 | * @gifconf: Function handler | |
1972 | * | |
1973 | * Register protocol dependent address dumping routines. The handler | |
1974 | * that is passed must not be freed or reused until it has been replaced | |
1975 | * by another handler. | |
1976 | */ | |
1977 | int register_gifconf(unsigned int family, gifconf_func_t * gifconf) | |
1978 | { | |
1979 | if (family >= NPROTO) | |
1980 | return -EINVAL; | |
1981 | gifconf_list[family] = gifconf; | |
1982 | return 0; | |
1983 | } | |
1984 | ||
1985 | ||
1986 | /* | |
1987 | * Map an interface index to its name (SIOCGIFNAME) | |
1988 | */ | |
1989 | ||
1990 | /* | |
1991 | * We need this ioctl for efficient implementation of the | |
1992 | * if_indextoname() function required by the IPv6 API. Without | |
1993 | * it, we would have to search all the interfaces to find a | |
1994 | * match. --pb | |
1995 | */ | |
1996 | ||
1997 | static int dev_ifname(struct ifreq __user *arg) | |
1998 | { | |
1999 | struct net_device *dev; | |
2000 | struct ifreq ifr; | |
2001 | ||
2002 | /* | |
2003 | * Fetch the caller's info block. | |
2004 | */ | |
2005 | ||
2006 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
2007 | return -EFAULT; | |
2008 | ||
2009 | read_lock(&dev_base_lock); | |
2010 | dev = __dev_get_by_index(ifr.ifr_ifindex); | |
2011 | if (!dev) { | |
2012 | read_unlock(&dev_base_lock); | |
2013 | return -ENODEV; | |
2014 | } | |
2015 | ||
2016 | strcpy(ifr.ifr_name, dev->name); | |
2017 | read_unlock(&dev_base_lock); | |
2018 | ||
2019 | if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) | |
2020 | return -EFAULT; | |
2021 | return 0; | |
2022 | } | |
2023 | ||
2024 | /* | |
2025 | * Perform a SIOCGIFCONF call. This structure will change | |
2026 | * size eventually, and there is nothing I can do about it. | |
2027 | * Thus we will need a 'compatibility mode'. | |
2028 | */ | |
2029 | ||
2030 | static int dev_ifconf(char __user *arg) | |
2031 | { | |
2032 | struct ifconf ifc; | |
2033 | struct net_device *dev; | |
2034 | char __user *pos; | |
2035 | int len; | |
2036 | int total; | |
2037 | int i; | |
2038 | ||
2039 | /* | |
2040 | * Fetch the caller's info block. | |
2041 | */ | |
2042 | ||
2043 | if (copy_from_user(&ifc, arg, sizeof(struct ifconf))) | |
2044 | return -EFAULT; | |
2045 | ||
2046 | pos = ifc.ifc_buf; | |
2047 | len = ifc.ifc_len; | |
2048 | ||
2049 | /* | |
2050 | * Loop over the interfaces, and write an info block for each. | |
2051 | */ | |
2052 | ||
2053 | total = 0; | |
7562f876 | 2054 | for_each_netdev(dev) { |
1da177e4 LT |
2055 | for (i = 0; i < NPROTO; i++) { |
2056 | if (gifconf_list[i]) { | |
2057 | int done; | |
2058 | if (!pos) | |
2059 | done = gifconf_list[i](dev, NULL, 0); | |
2060 | else | |
2061 | done = gifconf_list[i](dev, pos + total, | |
2062 | len - total); | |
2063 | if (done < 0) | |
2064 | return -EFAULT; | |
2065 | total += done; | |
2066 | } | |
2067 | } | |
4ec93edb | 2068 | } |
1da177e4 LT |
2069 | |
2070 | /* | |
2071 | * All done. Write the updated control block back to the caller. | |
2072 | */ | |
2073 | ifc.ifc_len = total; | |
2074 | ||
2075 | /* | |
2076 | * Both BSD and Solaris return 0 here, so we do too. | |
2077 | */ | |
2078 | return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0; | |
2079 | } | |
2080 | ||
2081 | #ifdef CONFIG_PROC_FS | |
2082 | /* | |
2083 | * This is invoked by the /proc filesystem handler to display a device | |
2084 | * in detail. | |
2085 | */ | |
7562f876 | 2086 | void *dev_seq_start(struct seq_file *seq, loff_t *pos) |
1da177e4 | 2087 | { |
7562f876 | 2088 | loff_t off; |
1da177e4 | 2089 | struct net_device *dev; |
1da177e4 | 2090 | |
7562f876 PE |
2091 | read_lock(&dev_base_lock); |
2092 | if (!*pos) | |
2093 | return SEQ_START_TOKEN; | |
1da177e4 | 2094 | |
7562f876 PE |
2095 | off = 1; |
2096 | for_each_netdev(dev) | |
2097 | if (off++ == *pos) | |
2098 | return dev; | |
1da177e4 | 2099 | |
7562f876 | 2100 | return NULL; |
1da177e4 LT |
2101 | } |
2102 | ||
2103 | void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2104 | { | |
2105 | ++*pos; | |
7562f876 PE |
2106 | return v == SEQ_START_TOKEN ? |
2107 | first_net_device() : next_net_device((struct net_device *)v); | |
1da177e4 LT |
2108 | } |
2109 | ||
2110 | void dev_seq_stop(struct seq_file *seq, void *v) | |
2111 | { | |
2112 | read_unlock(&dev_base_lock); | |
2113 | } | |
2114 | ||
2115 | static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) | |
2116 | { | |
c45d286e | 2117 | struct net_device_stats *stats = dev->get_stats(dev); |
1da177e4 | 2118 | |
5a1b5898 RR |
2119 | seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu " |
2120 | "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n", | |
2121 | dev->name, stats->rx_bytes, stats->rx_packets, | |
2122 | stats->rx_errors, | |
2123 | stats->rx_dropped + stats->rx_missed_errors, | |
2124 | stats->rx_fifo_errors, | |
2125 | stats->rx_length_errors + stats->rx_over_errors + | |
2126 | stats->rx_crc_errors + stats->rx_frame_errors, | |
2127 | stats->rx_compressed, stats->multicast, | |
2128 | stats->tx_bytes, stats->tx_packets, | |
2129 | stats->tx_errors, stats->tx_dropped, | |
2130 | stats->tx_fifo_errors, stats->collisions, | |
2131 | stats->tx_carrier_errors + | |
2132 | stats->tx_aborted_errors + | |
2133 | stats->tx_window_errors + | |
2134 | stats->tx_heartbeat_errors, | |
2135 | stats->tx_compressed); | |
1da177e4 LT |
2136 | } |
2137 | ||
2138 | /* | |
2139 | * Called from the PROCfs module. This now uses the new arbitrary sized | |
2140 | * /proc/net interface to create /proc/net/dev | |
2141 | */ | |
2142 | static int dev_seq_show(struct seq_file *seq, void *v) | |
2143 | { | |
2144 | if (v == SEQ_START_TOKEN) | |
2145 | seq_puts(seq, "Inter-| Receive " | |
2146 | " | Transmit\n" | |
2147 | " face |bytes packets errs drop fifo frame " | |
2148 | "compressed multicast|bytes packets errs " | |
2149 | "drop fifo colls carrier compressed\n"); | |
2150 | else | |
2151 | dev_seq_printf_stats(seq, v); | |
2152 | return 0; | |
2153 | } | |
2154 | ||
2155 | static struct netif_rx_stats *softnet_get_online(loff_t *pos) | |
2156 | { | |
2157 | struct netif_rx_stats *rc = NULL; | |
2158 | ||
2159 | while (*pos < NR_CPUS) | |
4ec93edb | 2160 | if (cpu_online(*pos)) { |
1da177e4 LT |
2161 | rc = &per_cpu(netdev_rx_stat, *pos); |
2162 | break; | |
2163 | } else | |
2164 | ++*pos; | |
2165 | return rc; | |
2166 | } | |
2167 | ||
2168 | static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) | |
2169 | { | |
2170 | return softnet_get_online(pos); | |
2171 | } | |
2172 | ||
2173 | static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2174 | { | |
2175 | ++*pos; | |
2176 | return softnet_get_online(pos); | |
2177 | } | |
2178 | ||
2179 | static void softnet_seq_stop(struct seq_file *seq, void *v) | |
2180 | { | |
2181 | } | |
2182 | ||
2183 | static int softnet_seq_show(struct seq_file *seq, void *v) | |
2184 | { | |
2185 | struct netif_rx_stats *s = v; | |
2186 | ||
2187 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n", | |
31aa02c5 | 2188 | s->total, s->dropped, s->time_squeeze, 0, |
c1ebcdb8 SH |
2189 | 0, 0, 0, 0, /* was fastroute */ |
2190 | s->cpu_collision ); | |
1da177e4 LT |
2191 | return 0; |
2192 | } | |
2193 | ||
f690808e | 2194 | static const struct seq_operations dev_seq_ops = { |
1da177e4 LT |
2195 | .start = dev_seq_start, |
2196 | .next = dev_seq_next, | |
2197 | .stop = dev_seq_stop, | |
2198 | .show = dev_seq_show, | |
2199 | }; | |
2200 | ||
2201 | static int dev_seq_open(struct inode *inode, struct file *file) | |
2202 | { | |
2203 | return seq_open(file, &dev_seq_ops); | |
2204 | } | |
2205 | ||
9a32144e | 2206 | static const struct file_operations dev_seq_fops = { |
1da177e4 LT |
2207 | .owner = THIS_MODULE, |
2208 | .open = dev_seq_open, | |
2209 | .read = seq_read, | |
2210 | .llseek = seq_lseek, | |
2211 | .release = seq_release, | |
2212 | }; | |
2213 | ||
f690808e | 2214 | static const struct seq_operations softnet_seq_ops = { |
1da177e4 LT |
2215 | .start = softnet_seq_start, |
2216 | .next = softnet_seq_next, | |
2217 | .stop = softnet_seq_stop, | |
2218 | .show = softnet_seq_show, | |
2219 | }; | |
2220 | ||
2221 | static int softnet_seq_open(struct inode *inode, struct file *file) | |
2222 | { | |
2223 | return seq_open(file, &softnet_seq_ops); | |
2224 | } | |
2225 | ||
9a32144e | 2226 | static const struct file_operations softnet_seq_fops = { |
1da177e4 LT |
2227 | .owner = THIS_MODULE, |
2228 | .open = softnet_seq_open, | |
2229 | .read = seq_read, | |
2230 | .llseek = seq_lseek, | |
2231 | .release = seq_release, | |
2232 | }; | |
2233 | ||
0e1256ff SH |
2234 | static void *ptype_get_idx(loff_t pos) |
2235 | { | |
2236 | struct packet_type *pt = NULL; | |
2237 | loff_t i = 0; | |
2238 | int t; | |
2239 | ||
2240 | list_for_each_entry_rcu(pt, &ptype_all, list) { | |
2241 | if (i == pos) | |
2242 | return pt; | |
2243 | ++i; | |
2244 | } | |
2245 | ||
2246 | for (t = 0; t < 16; t++) { | |
2247 | list_for_each_entry_rcu(pt, &ptype_base[t], list) { | |
2248 | if (i == pos) | |
2249 | return pt; | |
2250 | ++i; | |
2251 | } | |
2252 | } | |
2253 | return NULL; | |
2254 | } | |
2255 | ||
2256 | static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) | |
2257 | { | |
2258 | rcu_read_lock(); | |
2259 | return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN; | |
2260 | } | |
2261 | ||
2262 | static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2263 | { | |
2264 | struct packet_type *pt; | |
2265 | struct list_head *nxt; | |
2266 | int hash; | |
2267 | ||
2268 | ++*pos; | |
2269 | if (v == SEQ_START_TOKEN) | |
2270 | return ptype_get_idx(0); | |
2271 | ||
2272 | pt = v; | |
2273 | nxt = pt->list.next; | |
2274 | if (pt->type == htons(ETH_P_ALL)) { | |
2275 | if (nxt != &ptype_all) | |
2276 | goto found; | |
2277 | hash = 0; | |
2278 | nxt = ptype_base[0].next; | |
2279 | } else | |
2280 | hash = ntohs(pt->type) & 15; | |
2281 | ||
2282 | while (nxt == &ptype_base[hash]) { | |
2283 | if (++hash >= 16) | |
2284 | return NULL; | |
2285 | nxt = ptype_base[hash].next; | |
2286 | } | |
2287 | found: | |
2288 | return list_entry(nxt, struct packet_type, list); | |
2289 | } | |
2290 | ||
2291 | static void ptype_seq_stop(struct seq_file *seq, void *v) | |
2292 | { | |
2293 | rcu_read_unlock(); | |
2294 | } | |
2295 | ||
2296 | static void ptype_seq_decode(struct seq_file *seq, void *sym) | |
2297 | { | |
2298 | #ifdef CONFIG_KALLSYMS | |
2299 | unsigned long offset = 0, symsize; | |
2300 | const char *symname; | |
2301 | char *modname; | |
2302 | char namebuf[128]; | |
2303 | ||
2304 | symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset, | |
2305 | &modname, namebuf); | |
2306 | ||
2307 | if (symname) { | |
2308 | char *delim = ":"; | |
2309 | ||
2310 | if (!modname) | |
2311 | modname = delim = ""; | |
2312 | seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim, | |
2313 | symname, offset); | |
2314 | return; | |
2315 | } | |
2316 | #endif | |
2317 | ||
2318 | seq_printf(seq, "[%p]", sym); | |
2319 | } | |
2320 | ||
2321 | static int ptype_seq_show(struct seq_file *seq, void *v) | |
2322 | { | |
2323 | struct packet_type *pt = v; | |
2324 | ||
2325 | if (v == SEQ_START_TOKEN) | |
2326 | seq_puts(seq, "Type Device Function\n"); | |
2327 | else { | |
2328 | if (pt->type == htons(ETH_P_ALL)) | |
2329 | seq_puts(seq, "ALL "); | |
2330 | else | |
2331 | seq_printf(seq, "%04x", ntohs(pt->type)); | |
2332 | ||
2333 | seq_printf(seq, " %-8s ", | |
2334 | pt->dev ? pt->dev->name : ""); | |
2335 | ptype_seq_decode(seq, pt->func); | |
2336 | seq_putc(seq, '\n'); | |
2337 | } | |
2338 | ||
2339 | return 0; | |
2340 | } | |
2341 | ||
2342 | static const struct seq_operations ptype_seq_ops = { | |
2343 | .start = ptype_seq_start, | |
2344 | .next = ptype_seq_next, | |
2345 | .stop = ptype_seq_stop, | |
2346 | .show = ptype_seq_show, | |
2347 | }; | |
2348 | ||
2349 | static int ptype_seq_open(struct inode *inode, struct file *file) | |
2350 | { | |
2351 | return seq_open(file, &ptype_seq_ops); | |
2352 | } | |
2353 | ||
2354 | static const struct file_operations ptype_seq_fops = { | |
2355 | .owner = THIS_MODULE, | |
2356 | .open = ptype_seq_open, | |
2357 | .read = seq_read, | |
2358 | .llseek = seq_lseek, | |
2359 | .release = seq_release, | |
2360 | }; | |
2361 | ||
2362 | ||
1da177e4 LT |
2363 | static int __init dev_proc_init(void) |
2364 | { | |
2365 | int rc = -ENOMEM; | |
2366 | ||
2367 | if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops)) | |
2368 | goto out; | |
2369 | if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops)) | |
2370 | goto out_dev; | |
0e1256ff SH |
2371 | if (!proc_net_fops_create("ptype", S_IRUGO, &ptype_seq_fops)) |
2372 | goto out_dev2; | |
2373 | ||
295f4a1f | 2374 | if (wext_proc_init()) |
1da177e4 LT |
2375 | goto out_softnet; |
2376 | rc = 0; | |
2377 | out: | |
2378 | return rc; | |
2379 | out_softnet: | |
0e1256ff | 2380 | proc_net_remove("ptype"); |
2396a22e JJS |
2381 | out_dev2: |
2382 | proc_net_remove("softnet_stat"); | |
1da177e4 LT |
2383 | out_dev: |
2384 | proc_net_remove("dev"); | |
2385 | goto out; | |
2386 | } | |
2387 | #else | |
2388 | #define dev_proc_init() 0 | |
2389 | #endif /* CONFIG_PROC_FS */ | |
2390 | ||
2391 | ||
2392 | /** | |
2393 | * netdev_set_master - set up master/slave pair | |
2394 | * @slave: slave device | |
2395 | * @master: new master device | |
2396 | * | |
2397 | * Changes the master device of the slave. Pass %NULL to break the | |
2398 | * bonding. The caller must hold the RTNL semaphore. On a failure | |
2399 | * a negative errno code is returned. On success the reference counts | |
2400 | * are adjusted, %RTM_NEWLINK is sent to the routing socket and the | |
2401 | * function returns zero. | |
2402 | */ | |
2403 | int netdev_set_master(struct net_device *slave, struct net_device *master) | |
2404 | { | |
2405 | struct net_device *old = slave->master; | |
2406 | ||
2407 | ASSERT_RTNL(); | |
2408 | ||
2409 | if (master) { | |
2410 | if (old) | |
2411 | return -EBUSY; | |
2412 | dev_hold(master); | |
2413 | } | |
2414 | ||
2415 | slave->master = master; | |
4ec93edb | 2416 | |
1da177e4 LT |
2417 | synchronize_net(); |
2418 | ||
2419 | if (old) | |
2420 | dev_put(old); | |
2421 | ||
2422 | if (master) | |
2423 | slave->flags |= IFF_SLAVE; | |
2424 | else | |
2425 | slave->flags &= ~IFF_SLAVE; | |
2426 | ||
2427 | rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE); | |
2428 | return 0; | |
2429 | } | |
2430 | ||
2431 | /** | |
2432 | * dev_set_promiscuity - update promiscuity count on a device | |
2433 | * @dev: device | |
2434 | * @inc: modifier | |
2435 | * | |
3041a069 | 2436 | * Add or remove promiscuity from a device. While the count in the device |
1da177e4 LT |
2437 | * remains above zero the interface remains promiscuous. Once it hits zero |
2438 | * the device reverts back to normal filtering operation. A negative inc | |
2439 | * value is used to drop promiscuity on the device. | |
2440 | */ | |
2441 | void dev_set_promiscuity(struct net_device *dev, int inc) | |
2442 | { | |
2443 | unsigned short old_flags = dev->flags; | |
2444 | ||
1da177e4 LT |
2445 | if ((dev->promiscuity += inc) == 0) |
2446 | dev->flags &= ~IFF_PROMISC; | |
52609c0b DC |
2447 | else |
2448 | dev->flags |= IFF_PROMISC; | |
2449 | if (dev->flags != old_flags) { | |
1da177e4 LT |
2450 | dev_mc_upload(dev); |
2451 | printk(KERN_INFO "device %s %s promiscuous mode\n", | |
2452 | dev->name, (dev->flags & IFF_PROMISC) ? "entered" : | |
4ec93edb | 2453 | "left"); |
5bdb9886 SG |
2454 | audit_log(current->audit_context, GFP_ATOMIC, |
2455 | AUDIT_ANOM_PROMISCUOUS, | |
2456 | "dev=%s prom=%d old_prom=%d auid=%u", | |
2457 | dev->name, (dev->flags & IFF_PROMISC), | |
2458 | (old_flags & IFF_PROMISC), | |
4ec93edb | 2459 | audit_get_loginuid(current->audit_context)); |
1da177e4 LT |
2460 | } |
2461 | } | |
2462 | ||
2463 | /** | |
2464 | * dev_set_allmulti - update allmulti count on a device | |
2465 | * @dev: device | |
2466 | * @inc: modifier | |
2467 | * | |
2468 | * Add or remove reception of all multicast frames to a device. While the | |
2469 | * count in the device remains above zero the interface remains listening | |
2470 | * to all interfaces. Once it hits zero the device reverts back to normal | |
2471 | * filtering operation. A negative @inc value is used to drop the counter | |
2472 | * when releasing a resource needing all multicasts. | |
2473 | */ | |
2474 | ||
2475 | void dev_set_allmulti(struct net_device *dev, int inc) | |
2476 | { | |
2477 | unsigned short old_flags = dev->flags; | |
2478 | ||
2479 | dev->flags |= IFF_ALLMULTI; | |
2480 | if ((dev->allmulti += inc) == 0) | |
2481 | dev->flags &= ~IFF_ALLMULTI; | |
2482 | if (dev->flags ^ old_flags) | |
2483 | dev_mc_upload(dev); | |
2484 | } | |
2485 | ||
2486 | unsigned dev_get_flags(const struct net_device *dev) | |
2487 | { | |
2488 | unsigned flags; | |
2489 | ||
2490 | flags = (dev->flags & ~(IFF_PROMISC | | |
2491 | IFF_ALLMULTI | | |
b00055aa SR |
2492 | IFF_RUNNING | |
2493 | IFF_LOWER_UP | | |
2494 | IFF_DORMANT)) | | |
1da177e4 LT |
2495 | (dev->gflags & (IFF_PROMISC | |
2496 | IFF_ALLMULTI)); | |
2497 | ||
b00055aa SR |
2498 | if (netif_running(dev)) { |
2499 | if (netif_oper_up(dev)) | |
2500 | flags |= IFF_RUNNING; | |
2501 | if (netif_carrier_ok(dev)) | |
2502 | flags |= IFF_LOWER_UP; | |
2503 | if (netif_dormant(dev)) | |
2504 | flags |= IFF_DORMANT; | |
2505 | } | |
1da177e4 LT |
2506 | |
2507 | return flags; | |
2508 | } | |
2509 | ||
2510 | int dev_change_flags(struct net_device *dev, unsigned flags) | |
2511 | { | |
2512 | int ret; | |
2513 | int old_flags = dev->flags; | |
2514 | ||
2515 | /* | |
2516 | * Set the flags on our device. | |
2517 | */ | |
2518 | ||
2519 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
2520 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
2521 | IFF_AUTOMEDIA)) | | |
2522 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
2523 | IFF_ALLMULTI)); | |
2524 | ||
2525 | /* | |
2526 | * Load in the correct multicast list now the flags have changed. | |
2527 | */ | |
2528 | ||
2529 | dev_mc_upload(dev); | |
2530 | ||
2531 | /* | |
2532 | * Have we downed the interface. We handle IFF_UP ourselves | |
2533 | * according to user attempts to set it, rather than blindly | |
2534 | * setting it. | |
2535 | */ | |
2536 | ||
2537 | ret = 0; | |
2538 | if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */ | |
2539 | ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev); | |
2540 | ||
2541 | if (!ret) | |
2542 | dev_mc_upload(dev); | |
2543 | } | |
2544 | ||
2545 | if (dev->flags & IFF_UP && | |
2546 | ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI | | |
2547 | IFF_VOLATILE))) | |
f07d5b94 | 2548 | raw_notifier_call_chain(&netdev_chain, |
e041c683 | 2549 | NETDEV_CHANGE, dev); |
1da177e4 LT |
2550 | |
2551 | if ((flags ^ dev->gflags) & IFF_PROMISC) { | |
2552 | int inc = (flags & IFF_PROMISC) ? +1 : -1; | |
2553 | dev->gflags ^= IFF_PROMISC; | |
2554 | dev_set_promiscuity(dev, inc); | |
2555 | } | |
2556 | ||
2557 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
2558 | is important. Some (broken) drivers set IFF_PROMISC, when | |
2559 | IFF_ALLMULTI is requested not asking us and not reporting. | |
2560 | */ | |
2561 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
2562 | int inc = (flags & IFF_ALLMULTI) ? +1 : -1; | |
2563 | dev->gflags ^= IFF_ALLMULTI; | |
2564 | dev_set_allmulti(dev, inc); | |
2565 | } | |
2566 | ||
2567 | if (old_flags ^ dev->flags) | |
2568 | rtmsg_ifinfo(RTM_NEWLINK, dev, old_flags ^ dev->flags); | |
2569 | ||
2570 | return ret; | |
2571 | } | |
2572 | ||
2573 | int dev_set_mtu(struct net_device *dev, int new_mtu) | |
2574 | { | |
2575 | int err; | |
2576 | ||
2577 | if (new_mtu == dev->mtu) | |
2578 | return 0; | |
2579 | ||
2580 | /* MTU must be positive. */ | |
2581 | if (new_mtu < 0) | |
2582 | return -EINVAL; | |
2583 | ||
2584 | if (!netif_device_present(dev)) | |
2585 | return -ENODEV; | |
2586 | ||
2587 | err = 0; | |
2588 | if (dev->change_mtu) | |
2589 | err = dev->change_mtu(dev, new_mtu); | |
2590 | else | |
2591 | dev->mtu = new_mtu; | |
2592 | if (!err && dev->flags & IFF_UP) | |
f07d5b94 | 2593 | raw_notifier_call_chain(&netdev_chain, |
e041c683 | 2594 | NETDEV_CHANGEMTU, dev); |
1da177e4 LT |
2595 | return err; |
2596 | } | |
2597 | ||
2598 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) | |
2599 | { | |
2600 | int err; | |
2601 | ||
2602 | if (!dev->set_mac_address) | |
2603 | return -EOPNOTSUPP; | |
2604 | if (sa->sa_family != dev->type) | |
2605 | return -EINVAL; | |
2606 | if (!netif_device_present(dev)) | |
2607 | return -ENODEV; | |
2608 | err = dev->set_mac_address(dev, sa); | |
2609 | if (!err) | |
f07d5b94 | 2610 | raw_notifier_call_chain(&netdev_chain, |
e041c683 | 2611 | NETDEV_CHANGEADDR, dev); |
1da177e4 LT |
2612 | return err; |
2613 | } | |
2614 | ||
2615 | /* | |
2616 | * Perform the SIOCxIFxxx calls. | |
2617 | */ | |
2618 | static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd) | |
2619 | { | |
2620 | int err; | |
2621 | struct net_device *dev = __dev_get_by_name(ifr->ifr_name); | |
2622 | ||
2623 | if (!dev) | |
2624 | return -ENODEV; | |
2625 | ||
2626 | switch (cmd) { | |
2627 | case SIOCGIFFLAGS: /* Get interface flags */ | |
2628 | ifr->ifr_flags = dev_get_flags(dev); | |
2629 | return 0; | |
2630 | ||
2631 | case SIOCSIFFLAGS: /* Set interface flags */ | |
2632 | return dev_change_flags(dev, ifr->ifr_flags); | |
2633 | ||
2634 | case SIOCGIFMETRIC: /* Get the metric on the interface | |
2635 | (currently unused) */ | |
2636 | ifr->ifr_metric = 0; | |
2637 | return 0; | |
2638 | ||
2639 | case SIOCSIFMETRIC: /* Set the metric on the interface | |
2640 | (currently unused) */ | |
2641 | return -EOPNOTSUPP; | |
2642 | ||
2643 | case SIOCGIFMTU: /* Get the MTU of a device */ | |
2644 | ifr->ifr_mtu = dev->mtu; | |
2645 | return 0; | |
2646 | ||
2647 | case SIOCSIFMTU: /* Set the MTU of a device */ | |
2648 | return dev_set_mtu(dev, ifr->ifr_mtu); | |
2649 | ||
2650 | case SIOCGIFHWADDR: | |
2651 | if (!dev->addr_len) | |
2652 | memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data); | |
2653 | else | |
2654 | memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr, | |
2655 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); | |
2656 | ifr->ifr_hwaddr.sa_family = dev->type; | |
2657 | return 0; | |
2658 | ||
2659 | case SIOCSIFHWADDR: | |
2660 | return dev_set_mac_address(dev, &ifr->ifr_hwaddr); | |
2661 | ||
2662 | case SIOCSIFHWBROADCAST: | |
2663 | if (ifr->ifr_hwaddr.sa_family != dev->type) | |
2664 | return -EINVAL; | |
2665 | memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, | |
2666 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); | |
f07d5b94 | 2667 | raw_notifier_call_chain(&netdev_chain, |
1da177e4 LT |
2668 | NETDEV_CHANGEADDR, dev); |
2669 | return 0; | |
2670 | ||
2671 | case SIOCGIFMAP: | |
2672 | ifr->ifr_map.mem_start = dev->mem_start; | |
2673 | ifr->ifr_map.mem_end = dev->mem_end; | |
2674 | ifr->ifr_map.base_addr = dev->base_addr; | |
2675 | ifr->ifr_map.irq = dev->irq; | |
2676 | ifr->ifr_map.dma = dev->dma; | |
2677 | ifr->ifr_map.port = dev->if_port; | |
2678 | return 0; | |
2679 | ||
2680 | case SIOCSIFMAP: | |
2681 | if (dev->set_config) { | |
2682 | if (!netif_device_present(dev)) | |
2683 | return -ENODEV; | |
2684 | return dev->set_config(dev, &ifr->ifr_map); | |
2685 | } | |
2686 | return -EOPNOTSUPP; | |
2687 | ||
2688 | case SIOCADDMULTI: | |
2689 | if (!dev->set_multicast_list || | |
2690 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) | |
2691 | return -EINVAL; | |
2692 | if (!netif_device_present(dev)) | |
2693 | return -ENODEV; | |
2694 | return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data, | |
2695 | dev->addr_len, 1); | |
2696 | ||
2697 | case SIOCDELMULTI: | |
2698 | if (!dev->set_multicast_list || | |
2699 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) | |
2700 | return -EINVAL; | |
2701 | if (!netif_device_present(dev)) | |
2702 | return -ENODEV; | |
2703 | return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data, | |
2704 | dev->addr_len, 1); | |
2705 | ||
2706 | case SIOCGIFINDEX: | |
2707 | ifr->ifr_ifindex = dev->ifindex; | |
2708 | return 0; | |
2709 | ||
2710 | case SIOCGIFTXQLEN: | |
2711 | ifr->ifr_qlen = dev->tx_queue_len; | |
2712 | return 0; | |
2713 | ||
2714 | case SIOCSIFTXQLEN: | |
2715 | if (ifr->ifr_qlen < 0) | |
2716 | return -EINVAL; | |
2717 | dev->tx_queue_len = ifr->ifr_qlen; | |
2718 | return 0; | |
2719 | ||
2720 | case SIOCSIFNAME: | |
2721 | ifr->ifr_newname[IFNAMSIZ-1] = '\0'; | |
2722 | return dev_change_name(dev, ifr->ifr_newname); | |
2723 | ||
2724 | /* | |
2725 | * Unknown or private ioctl | |
2726 | */ | |
2727 | ||
2728 | default: | |
2729 | if ((cmd >= SIOCDEVPRIVATE && | |
2730 | cmd <= SIOCDEVPRIVATE + 15) || | |
2731 | cmd == SIOCBONDENSLAVE || | |
2732 | cmd == SIOCBONDRELEASE || | |
2733 | cmd == SIOCBONDSETHWADDR || | |
2734 | cmd == SIOCBONDSLAVEINFOQUERY || | |
2735 | cmd == SIOCBONDINFOQUERY || | |
2736 | cmd == SIOCBONDCHANGEACTIVE || | |
2737 | cmd == SIOCGMIIPHY || | |
2738 | cmd == SIOCGMIIREG || | |
2739 | cmd == SIOCSMIIREG || | |
2740 | cmd == SIOCBRADDIF || | |
2741 | cmd == SIOCBRDELIF || | |
2742 | cmd == SIOCWANDEV) { | |
2743 | err = -EOPNOTSUPP; | |
2744 | if (dev->do_ioctl) { | |
2745 | if (netif_device_present(dev)) | |
2746 | err = dev->do_ioctl(dev, ifr, | |
2747 | cmd); | |
2748 | else | |
2749 | err = -ENODEV; | |
2750 | } | |
2751 | } else | |
2752 | err = -EINVAL; | |
2753 | ||
2754 | } | |
2755 | return err; | |
2756 | } | |
2757 | ||
2758 | /* | |
2759 | * This function handles all "interface"-type I/O control requests. The actual | |
2760 | * 'doing' part of this is dev_ifsioc above. | |
2761 | */ | |
2762 | ||
2763 | /** | |
2764 | * dev_ioctl - network device ioctl | |
2765 | * @cmd: command to issue | |
2766 | * @arg: pointer to a struct ifreq in user space | |
2767 | * | |
2768 | * Issue ioctl functions to devices. This is normally called by the | |
2769 | * user space syscall interfaces but can sometimes be useful for | |
2770 | * other purposes. The return value is the return from the syscall if | |
2771 | * positive or a negative errno code on error. | |
2772 | */ | |
2773 | ||
2774 | int dev_ioctl(unsigned int cmd, void __user *arg) | |
2775 | { | |
2776 | struct ifreq ifr; | |
2777 | int ret; | |
2778 | char *colon; | |
2779 | ||
2780 | /* One special case: SIOCGIFCONF takes ifconf argument | |
2781 | and requires shared lock, because it sleeps writing | |
2782 | to user space. | |
2783 | */ | |
2784 | ||
2785 | if (cmd == SIOCGIFCONF) { | |
6756ae4b | 2786 | rtnl_lock(); |
1da177e4 | 2787 | ret = dev_ifconf((char __user *) arg); |
6756ae4b | 2788 | rtnl_unlock(); |
1da177e4 LT |
2789 | return ret; |
2790 | } | |
2791 | if (cmd == SIOCGIFNAME) | |
2792 | return dev_ifname((struct ifreq __user *)arg); | |
2793 | ||
2794 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
2795 | return -EFAULT; | |
2796 | ||
2797 | ifr.ifr_name[IFNAMSIZ-1] = 0; | |
2798 | ||
2799 | colon = strchr(ifr.ifr_name, ':'); | |
2800 | if (colon) | |
2801 | *colon = 0; | |
2802 | ||
2803 | /* | |
2804 | * See which interface the caller is talking about. | |
2805 | */ | |
2806 | ||
2807 | switch (cmd) { | |
2808 | /* | |
2809 | * These ioctl calls: | |
2810 | * - can be done by all. | |
2811 | * - atomic and do not require locking. | |
2812 | * - return a value | |
2813 | */ | |
2814 | case SIOCGIFFLAGS: | |
2815 | case SIOCGIFMETRIC: | |
2816 | case SIOCGIFMTU: | |
2817 | case SIOCGIFHWADDR: | |
2818 | case SIOCGIFSLAVE: | |
2819 | case SIOCGIFMAP: | |
2820 | case SIOCGIFINDEX: | |
2821 | case SIOCGIFTXQLEN: | |
2822 | dev_load(ifr.ifr_name); | |
2823 | read_lock(&dev_base_lock); | |
2824 | ret = dev_ifsioc(&ifr, cmd); | |
2825 | read_unlock(&dev_base_lock); | |
2826 | if (!ret) { | |
2827 | if (colon) | |
2828 | *colon = ':'; | |
2829 | if (copy_to_user(arg, &ifr, | |
2830 | sizeof(struct ifreq))) | |
2831 | ret = -EFAULT; | |
2832 | } | |
2833 | return ret; | |
2834 | ||
2835 | case SIOCETHTOOL: | |
2836 | dev_load(ifr.ifr_name); | |
2837 | rtnl_lock(); | |
2838 | ret = dev_ethtool(&ifr); | |
2839 | rtnl_unlock(); | |
2840 | if (!ret) { | |
2841 | if (colon) | |
2842 | *colon = ':'; | |
2843 | if (copy_to_user(arg, &ifr, | |
2844 | sizeof(struct ifreq))) | |
2845 | ret = -EFAULT; | |
2846 | } | |
2847 | return ret; | |
2848 | ||
2849 | /* | |
2850 | * These ioctl calls: | |
2851 | * - require superuser power. | |
2852 | * - require strict serialization. | |
2853 | * - return a value | |
2854 | */ | |
2855 | case SIOCGMIIPHY: | |
2856 | case SIOCGMIIREG: | |
2857 | case SIOCSIFNAME: | |
2858 | if (!capable(CAP_NET_ADMIN)) | |
2859 | return -EPERM; | |
2860 | dev_load(ifr.ifr_name); | |
2861 | rtnl_lock(); | |
2862 | ret = dev_ifsioc(&ifr, cmd); | |
2863 | rtnl_unlock(); | |
2864 | if (!ret) { | |
2865 | if (colon) | |
2866 | *colon = ':'; | |
2867 | if (copy_to_user(arg, &ifr, | |
2868 | sizeof(struct ifreq))) | |
2869 | ret = -EFAULT; | |
2870 | } | |
2871 | return ret; | |
2872 | ||
2873 | /* | |
2874 | * These ioctl calls: | |
2875 | * - require superuser power. | |
2876 | * - require strict serialization. | |
2877 | * - do not return a value | |
2878 | */ | |
2879 | case SIOCSIFFLAGS: | |
2880 | case SIOCSIFMETRIC: | |
2881 | case SIOCSIFMTU: | |
2882 | case SIOCSIFMAP: | |
2883 | case SIOCSIFHWADDR: | |
2884 | case SIOCSIFSLAVE: | |
2885 | case SIOCADDMULTI: | |
2886 | case SIOCDELMULTI: | |
2887 | case SIOCSIFHWBROADCAST: | |
2888 | case SIOCSIFTXQLEN: | |
2889 | case SIOCSMIIREG: | |
2890 | case SIOCBONDENSLAVE: | |
2891 | case SIOCBONDRELEASE: | |
2892 | case SIOCBONDSETHWADDR: | |
1da177e4 LT |
2893 | case SIOCBONDCHANGEACTIVE: |
2894 | case SIOCBRADDIF: | |
2895 | case SIOCBRDELIF: | |
2896 | if (!capable(CAP_NET_ADMIN)) | |
2897 | return -EPERM; | |
cabcac0b TG |
2898 | /* fall through */ |
2899 | case SIOCBONDSLAVEINFOQUERY: | |
2900 | case SIOCBONDINFOQUERY: | |
1da177e4 LT |
2901 | dev_load(ifr.ifr_name); |
2902 | rtnl_lock(); | |
2903 | ret = dev_ifsioc(&ifr, cmd); | |
2904 | rtnl_unlock(); | |
2905 | return ret; | |
2906 | ||
2907 | case SIOCGIFMEM: | |
2908 | /* Get the per device memory space. We can add this but | |
2909 | * currently do not support it */ | |
2910 | case SIOCSIFMEM: | |
2911 | /* Set the per device memory buffer space. | |
2912 | * Not applicable in our case */ | |
2913 | case SIOCSIFLINK: | |
2914 | return -EINVAL; | |
2915 | ||
2916 | /* | |
2917 | * Unknown or private ioctl. | |
2918 | */ | |
2919 | default: | |
2920 | if (cmd == SIOCWANDEV || | |
2921 | (cmd >= SIOCDEVPRIVATE && | |
2922 | cmd <= SIOCDEVPRIVATE + 15)) { | |
2923 | dev_load(ifr.ifr_name); | |
2924 | rtnl_lock(); | |
2925 | ret = dev_ifsioc(&ifr, cmd); | |
2926 | rtnl_unlock(); | |
2927 | if (!ret && copy_to_user(arg, &ifr, | |
2928 | sizeof(struct ifreq))) | |
2929 | ret = -EFAULT; | |
2930 | return ret; | |
2931 | } | |
1da177e4 | 2932 | /* Take care of Wireless Extensions */ |
295f4a1f JB |
2933 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) |
2934 | return wext_handle_ioctl(&ifr, cmd, arg); | |
1da177e4 LT |
2935 | return -EINVAL; |
2936 | } | |
2937 | } | |
2938 | ||
2939 | ||
2940 | /** | |
2941 | * dev_new_index - allocate an ifindex | |
2942 | * | |
2943 | * Returns a suitable unique value for a new device interface | |
2944 | * number. The caller must hold the rtnl semaphore or the | |
2945 | * dev_base_lock to be sure it remains unique. | |
2946 | */ | |
2947 | static int dev_new_index(void) | |
2948 | { | |
2949 | static int ifindex; | |
2950 | for (;;) { | |
2951 | if (++ifindex <= 0) | |
2952 | ifindex = 1; | |
2953 | if (!__dev_get_by_index(ifindex)) | |
2954 | return ifindex; | |
2955 | } | |
2956 | } | |
2957 | ||
2958 | static int dev_boot_phase = 1; | |
2959 | ||
2960 | /* Delayed registration/unregisteration */ | |
2961 | static DEFINE_SPINLOCK(net_todo_list_lock); | |
2962 | static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list); | |
2963 | ||
6f05f629 | 2964 | static void net_set_todo(struct net_device *dev) |
1da177e4 LT |
2965 | { |
2966 | spin_lock(&net_todo_list_lock); | |
2967 | list_add_tail(&dev->todo_list, &net_todo_list); | |
2968 | spin_unlock(&net_todo_list_lock); | |
2969 | } | |
2970 | ||
2971 | /** | |
2972 | * register_netdevice - register a network device | |
2973 | * @dev: device to register | |
2974 | * | |
2975 | * Take a completed network device structure and add it to the kernel | |
2976 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
2977 | * chain. 0 is returned on success. A negative errno code is returned | |
2978 | * on a failure to set up the device, or if the name is a duplicate. | |
2979 | * | |
2980 | * Callers must hold the rtnl semaphore. You may want | |
2981 | * register_netdev() instead of this. | |
2982 | * | |
2983 | * BUGS: | |
2984 | * The locking appears insufficient to guarantee two parallel registers | |
2985 | * will not get the same name. | |
2986 | */ | |
2987 | ||
2988 | int register_netdevice(struct net_device *dev) | |
2989 | { | |
2990 | struct hlist_head *head; | |
2991 | struct hlist_node *p; | |
2992 | int ret; | |
2993 | ||
2994 | BUG_ON(dev_boot_phase); | |
2995 | ASSERT_RTNL(); | |
2996 | ||
b17a7c17 SH |
2997 | might_sleep(); |
2998 | ||
1da177e4 LT |
2999 | /* When net_device's are persistent, this will be fatal. */ |
3000 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
3001 | ||
3002 | spin_lock_init(&dev->queue_lock); | |
932ff279 | 3003 | spin_lock_init(&dev->_xmit_lock); |
1da177e4 | 3004 | dev->xmit_lock_owner = -1; |
1da177e4 | 3005 | spin_lock_init(&dev->ingress_lock); |
1da177e4 | 3006 | |
1da177e4 LT |
3007 | dev->iflink = -1; |
3008 | ||
3009 | /* Init, if this function is available */ | |
3010 | if (dev->init) { | |
3011 | ret = dev->init(dev); | |
3012 | if (ret) { | |
3013 | if (ret > 0) | |
3014 | ret = -EIO; | |
90833aa4 | 3015 | goto out; |
1da177e4 LT |
3016 | } |
3017 | } | |
4ec93edb | 3018 | |
1da177e4 LT |
3019 | if (!dev_valid_name(dev->name)) { |
3020 | ret = -EINVAL; | |
90833aa4 | 3021 | goto out; |
1da177e4 LT |
3022 | } |
3023 | ||
3024 | dev->ifindex = dev_new_index(); | |
3025 | if (dev->iflink == -1) | |
3026 | dev->iflink = dev->ifindex; | |
3027 | ||
3028 | /* Check for existence of name */ | |
3029 | head = dev_name_hash(dev->name); | |
3030 | hlist_for_each(p, head) { | |
3031 | struct net_device *d | |
3032 | = hlist_entry(p, struct net_device, name_hlist); | |
3033 | if (!strncmp(d->name, dev->name, IFNAMSIZ)) { | |
3034 | ret = -EEXIST; | |
4ec93edb | 3035 | goto out; |
1da177e4 | 3036 | } |
4ec93edb | 3037 | } |
1da177e4 LT |
3038 | |
3039 | /* Fix illegal SG+CSUM combinations. */ | |
3040 | if ((dev->features & NETIF_F_SG) && | |
8648b305 | 3041 | !(dev->features & NETIF_F_ALL_CSUM)) { |
5a8da02b | 3042 | printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n", |
1da177e4 LT |
3043 | dev->name); |
3044 | dev->features &= ~NETIF_F_SG; | |
3045 | } | |
3046 | ||
3047 | /* TSO requires that SG is present as well. */ | |
3048 | if ((dev->features & NETIF_F_TSO) && | |
3049 | !(dev->features & NETIF_F_SG)) { | |
5a8da02b | 3050 | printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n", |
1da177e4 LT |
3051 | dev->name); |
3052 | dev->features &= ~NETIF_F_TSO; | |
3053 | } | |
e89e9cf5 AR |
3054 | if (dev->features & NETIF_F_UFO) { |
3055 | if (!(dev->features & NETIF_F_HW_CSUM)) { | |
3056 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no " | |
3057 | "NETIF_F_HW_CSUM feature.\n", | |
3058 | dev->name); | |
3059 | dev->features &= ~NETIF_F_UFO; | |
3060 | } | |
3061 | if (!(dev->features & NETIF_F_SG)) { | |
3062 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no " | |
3063 | "NETIF_F_SG feature.\n", | |
3064 | dev->name); | |
3065 | dev->features &= ~NETIF_F_UFO; | |
3066 | } | |
3067 | } | |
1da177e4 LT |
3068 | |
3069 | /* | |
3070 | * nil rebuild_header routine, | |
3071 | * that should be never called and used as just bug trap. | |
3072 | */ | |
3073 | ||
3074 | if (!dev->rebuild_header) | |
3075 | dev->rebuild_header = default_rebuild_header; | |
3076 | ||
b17a7c17 SH |
3077 | ret = netdev_register_sysfs(dev); |
3078 | if (ret) | |
90833aa4 | 3079 | goto out; |
b17a7c17 SH |
3080 | dev->reg_state = NETREG_REGISTERED; |
3081 | ||
1da177e4 LT |
3082 | /* |
3083 | * Default initial state at registry is that the | |
3084 | * device is present. | |
3085 | */ | |
3086 | ||
3087 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
3088 | ||
1da177e4 LT |
3089 | dev_init_scheduler(dev); |
3090 | write_lock_bh(&dev_base_lock); | |
7562f876 | 3091 | list_add_tail(&dev->dev_list, &dev_base_head); |
1da177e4 LT |
3092 | hlist_add_head(&dev->name_hlist, head); |
3093 | hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex)); | |
3094 | dev_hold(dev); | |
1da177e4 LT |
3095 | write_unlock_bh(&dev_base_lock); |
3096 | ||
3097 | /* Notify protocols, that a new device appeared. */ | |
f07d5b94 | 3098 | raw_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev); |
1da177e4 | 3099 | |
1da177e4 LT |
3100 | ret = 0; |
3101 | ||
3102 | out: | |
3103 | return ret; | |
1da177e4 LT |
3104 | } |
3105 | ||
3106 | /** | |
3107 | * register_netdev - register a network device | |
3108 | * @dev: device to register | |
3109 | * | |
3110 | * Take a completed network device structure and add it to the kernel | |
3111 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
3112 | * chain. 0 is returned on success. A negative errno code is returned | |
3113 | * on a failure to set up the device, or if the name is a duplicate. | |
3114 | * | |
38b4da38 | 3115 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
3116 | * and expands the device name if you passed a format string to |
3117 | * alloc_netdev. | |
3118 | */ | |
3119 | int register_netdev(struct net_device *dev) | |
3120 | { | |
3121 | int err; | |
3122 | ||
3123 | rtnl_lock(); | |
3124 | ||
3125 | /* | |
3126 | * If the name is a format string the caller wants us to do a | |
3127 | * name allocation. | |
3128 | */ | |
3129 | if (strchr(dev->name, '%')) { | |
3130 | err = dev_alloc_name(dev, dev->name); | |
3131 | if (err < 0) | |
3132 | goto out; | |
3133 | } | |
4ec93edb | 3134 | |
1da177e4 LT |
3135 | err = register_netdevice(dev); |
3136 | out: | |
3137 | rtnl_unlock(); | |
3138 | return err; | |
3139 | } | |
3140 | EXPORT_SYMBOL(register_netdev); | |
3141 | ||
3142 | /* | |
3143 | * netdev_wait_allrefs - wait until all references are gone. | |
3144 | * | |
3145 | * This is called when unregistering network devices. | |
3146 | * | |
3147 | * Any protocol or device that holds a reference should register | |
3148 | * for netdevice notification, and cleanup and put back the | |
3149 | * reference if they receive an UNREGISTER event. | |
3150 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 3151 | * call dev_put. |
1da177e4 LT |
3152 | */ |
3153 | static void netdev_wait_allrefs(struct net_device *dev) | |
3154 | { | |
3155 | unsigned long rebroadcast_time, warning_time; | |
3156 | ||
3157 | rebroadcast_time = warning_time = jiffies; | |
3158 | while (atomic_read(&dev->refcnt) != 0) { | |
3159 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { | |
6756ae4b | 3160 | rtnl_lock(); |
1da177e4 LT |
3161 | |
3162 | /* Rebroadcast unregister notification */ | |
f07d5b94 | 3163 | raw_notifier_call_chain(&netdev_chain, |
1da177e4 LT |
3164 | NETDEV_UNREGISTER, dev); |
3165 | ||
3166 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, | |
3167 | &dev->state)) { | |
3168 | /* We must not have linkwatch events | |
3169 | * pending on unregister. If this | |
3170 | * happens, we simply run the queue | |
3171 | * unscheduled, resulting in a noop | |
3172 | * for this device. | |
3173 | */ | |
3174 | linkwatch_run_queue(); | |
3175 | } | |
3176 | ||
6756ae4b | 3177 | __rtnl_unlock(); |
1da177e4 LT |
3178 | |
3179 | rebroadcast_time = jiffies; | |
3180 | } | |
3181 | ||
3182 | msleep(250); | |
3183 | ||
3184 | if (time_after(jiffies, warning_time + 10 * HZ)) { | |
3185 | printk(KERN_EMERG "unregister_netdevice: " | |
3186 | "waiting for %s to become free. Usage " | |
3187 | "count = %d\n", | |
3188 | dev->name, atomic_read(&dev->refcnt)); | |
3189 | warning_time = jiffies; | |
3190 | } | |
3191 | } | |
3192 | } | |
3193 | ||
3194 | /* The sequence is: | |
3195 | * | |
3196 | * rtnl_lock(); | |
3197 | * ... | |
3198 | * register_netdevice(x1); | |
3199 | * register_netdevice(x2); | |
3200 | * ... | |
3201 | * unregister_netdevice(y1); | |
3202 | * unregister_netdevice(y2); | |
3203 | * ... | |
3204 | * rtnl_unlock(); | |
3205 | * free_netdev(y1); | |
3206 | * free_netdev(y2); | |
3207 | * | |
3208 | * We are invoked by rtnl_unlock() after it drops the semaphore. | |
3209 | * This allows us to deal with problems: | |
b17a7c17 | 3210 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
3211 | * without deadlocking with linkwatch via keventd. |
3212 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
3213 | * safely in order to wait for the netdev refcnt to drop to zero. | |
3214 | */ | |
4a3e2f71 | 3215 | static DEFINE_MUTEX(net_todo_run_mutex); |
1da177e4 LT |
3216 | void netdev_run_todo(void) |
3217 | { | |
626ab0e6 | 3218 | struct list_head list; |
1da177e4 LT |
3219 | |
3220 | /* Need to guard against multiple cpu's getting out of order. */ | |
4a3e2f71 | 3221 | mutex_lock(&net_todo_run_mutex); |
1da177e4 LT |
3222 | |
3223 | /* Not safe to do outside the semaphore. We must not return | |
3224 | * until all unregister events invoked by the local processor | |
3225 | * have been completed (either by this todo run, or one on | |
3226 | * another cpu). | |
3227 | */ | |
3228 | if (list_empty(&net_todo_list)) | |
3229 | goto out; | |
3230 | ||
3231 | /* Snapshot list, allow later requests */ | |
3232 | spin_lock(&net_todo_list_lock); | |
626ab0e6 | 3233 | list_replace_init(&net_todo_list, &list); |
1da177e4 | 3234 | spin_unlock(&net_todo_list_lock); |
626ab0e6 | 3235 | |
1da177e4 LT |
3236 | while (!list_empty(&list)) { |
3237 | struct net_device *dev | |
3238 | = list_entry(list.next, struct net_device, todo_list); | |
3239 | list_del(&dev->todo_list); | |
3240 | ||
b17a7c17 SH |
3241 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
3242 | printk(KERN_ERR "network todo '%s' but state %d\n", | |
3243 | dev->name, dev->reg_state); | |
3244 | dump_stack(); | |
3245 | continue; | |
3246 | } | |
1da177e4 | 3247 | |
b17a7c17 SH |
3248 | netdev_unregister_sysfs(dev); |
3249 | dev->reg_state = NETREG_UNREGISTERED; | |
1da177e4 | 3250 | |
b17a7c17 | 3251 | netdev_wait_allrefs(dev); |
1da177e4 | 3252 | |
b17a7c17 SH |
3253 | /* paranoia */ |
3254 | BUG_ON(atomic_read(&dev->refcnt)); | |
3255 | BUG_TRAP(!dev->ip_ptr); | |
3256 | BUG_TRAP(!dev->ip6_ptr); | |
3257 | BUG_TRAP(!dev->dn_ptr); | |
1da177e4 | 3258 | |
b17a7c17 SH |
3259 | /* It must be the very last action, |
3260 | * after this 'dev' may point to freed up memory. | |
3261 | */ | |
3262 | if (dev->destructor) | |
3263 | dev->destructor(dev); | |
1da177e4 LT |
3264 | } |
3265 | ||
3266 | out: | |
4a3e2f71 | 3267 | mutex_unlock(&net_todo_run_mutex); |
1da177e4 LT |
3268 | } |
3269 | ||
5a1b5898 | 3270 | static struct net_device_stats *internal_stats(struct net_device *dev) |
c45d286e | 3271 | { |
5a1b5898 | 3272 | return &dev->stats; |
c45d286e RR |
3273 | } |
3274 | ||
1da177e4 LT |
3275 | /** |
3276 | * alloc_netdev - allocate network device | |
3277 | * @sizeof_priv: size of private data to allocate space for | |
3278 | * @name: device name format string | |
3279 | * @setup: callback to initialize device | |
3280 | * | |
3281 | * Allocates a struct net_device with private data area for driver use | |
3282 | * and performs basic initialization. | |
3283 | */ | |
3284 | struct net_device *alloc_netdev(int sizeof_priv, const char *name, | |
3285 | void (*setup)(struct net_device *)) | |
3286 | { | |
3287 | void *p; | |
3288 | struct net_device *dev; | |
3289 | int alloc_size; | |
3290 | ||
b6fe17d6 SH |
3291 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
3292 | ||
1da177e4 LT |
3293 | /* ensure 32-byte alignment of both the device and private area */ |
3294 | alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST; | |
3295 | alloc_size += sizeof_priv + NETDEV_ALIGN_CONST; | |
3296 | ||
31380de9 | 3297 | p = kzalloc(alloc_size, GFP_KERNEL); |
1da177e4 | 3298 | if (!p) { |
b6fe17d6 | 3299 | printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n"); |
1da177e4 LT |
3300 | return NULL; |
3301 | } | |
1da177e4 LT |
3302 | |
3303 | dev = (struct net_device *) | |
3304 | (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); | |
3305 | dev->padded = (char *)dev - (char *)p; | |
3306 | ||
3307 | if (sizeof_priv) | |
3308 | dev->priv = netdev_priv(dev); | |
3309 | ||
5a1b5898 | 3310 | dev->get_stats = internal_stats; |
1da177e4 LT |
3311 | setup(dev); |
3312 | strcpy(dev->name, name); | |
3313 | return dev; | |
3314 | } | |
3315 | EXPORT_SYMBOL(alloc_netdev); | |
3316 | ||
3317 | /** | |
3318 | * free_netdev - free network device | |
3319 | * @dev: device | |
3320 | * | |
4ec93edb YH |
3321 | * This function does the last stage of destroying an allocated device |
3322 | * interface. The reference to the device object is released. | |
1da177e4 LT |
3323 | * If this is the last reference then it will be freed. |
3324 | */ | |
3325 | void free_netdev(struct net_device *dev) | |
3326 | { | |
3327 | #ifdef CONFIG_SYSFS | |
3041a069 | 3328 | /* Compatibility with error handling in drivers */ |
1da177e4 LT |
3329 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
3330 | kfree((char *)dev - dev->padded); | |
3331 | return; | |
3332 | } | |
3333 | ||
3334 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
3335 | dev->reg_state = NETREG_RELEASED; | |
3336 | ||
43cb76d9 GKH |
3337 | /* will free via device release */ |
3338 | put_device(&dev->dev); | |
1da177e4 LT |
3339 | #else |
3340 | kfree((char *)dev - dev->padded); | |
3341 | #endif | |
3342 | } | |
4ec93edb | 3343 | |
1da177e4 | 3344 | /* Synchronize with packet receive processing. */ |
4ec93edb | 3345 | void synchronize_net(void) |
1da177e4 LT |
3346 | { |
3347 | might_sleep(); | |
fbd568a3 | 3348 | synchronize_rcu(); |
1da177e4 LT |
3349 | } |
3350 | ||
3351 | /** | |
3352 | * unregister_netdevice - remove device from the kernel | |
3353 | * @dev: device | |
3354 | * | |
3355 | * This function shuts down a device interface and removes it | |
3356 | * from the kernel tables. On success 0 is returned, on a failure | |
3357 | * a negative errno code is returned. | |
3358 | * | |
3359 | * Callers must hold the rtnl semaphore. You may want | |
3360 | * unregister_netdev() instead of this. | |
3361 | */ | |
3362 | ||
22f8cde5 | 3363 | void unregister_netdevice(struct net_device *dev) |
1da177e4 | 3364 | { |
1da177e4 LT |
3365 | BUG_ON(dev_boot_phase); |
3366 | ASSERT_RTNL(); | |
3367 | ||
3368 | /* Some devices call without registering for initialization unwind. */ | |
3369 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
3370 | printk(KERN_DEBUG "unregister_netdevice: device %s/%p never " | |
3371 | "was registered\n", dev->name, dev); | |
22f8cde5 SH |
3372 | |
3373 | WARN_ON(1); | |
3374 | return; | |
1da177e4 LT |
3375 | } |
3376 | ||
3377 | BUG_ON(dev->reg_state != NETREG_REGISTERED); | |
3378 | ||
3379 | /* If device is running, close it first. */ | |
3380 | if (dev->flags & IFF_UP) | |
3381 | dev_close(dev); | |
3382 | ||
3383 | /* And unlink it from device chain. */ | |
7562f876 PE |
3384 | write_lock_bh(&dev_base_lock); |
3385 | list_del(&dev->dev_list); | |
3386 | hlist_del(&dev->name_hlist); | |
3387 | hlist_del(&dev->index_hlist); | |
3388 | write_unlock_bh(&dev_base_lock); | |
1da177e4 LT |
3389 | |
3390 | dev->reg_state = NETREG_UNREGISTERING; | |
3391 | ||
3392 | synchronize_net(); | |
3393 | ||
3394 | /* Shutdown queueing discipline. */ | |
3395 | dev_shutdown(dev); | |
3396 | ||
4ec93edb | 3397 | |
1da177e4 LT |
3398 | /* Notify protocols, that we are about to destroy |
3399 | this device. They should clean all the things. | |
3400 | */ | |
f07d5b94 | 3401 | raw_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev); |
4ec93edb | 3402 | |
1da177e4 LT |
3403 | /* |
3404 | * Flush the multicast chain | |
3405 | */ | |
3406 | dev_mc_discard(dev); | |
3407 | ||
3408 | if (dev->uninit) | |
3409 | dev->uninit(dev); | |
3410 | ||
3411 | /* Notifier chain MUST detach us from master device. */ | |
3412 | BUG_TRAP(!dev->master); | |
3413 | ||
1da177e4 LT |
3414 | /* Finish processing unregister after unlock */ |
3415 | net_set_todo(dev); | |
3416 | ||
3417 | synchronize_net(); | |
3418 | ||
3419 | dev_put(dev); | |
1da177e4 LT |
3420 | } |
3421 | ||
3422 | /** | |
3423 | * unregister_netdev - remove device from the kernel | |
3424 | * @dev: device | |
3425 | * | |
3426 | * This function shuts down a device interface and removes it | |
3427 | * from the kernel tables. On success 0 is returned, on a failure | |
3428 | * a negative errno code is returned. | |
3429 | * | |
3430 | * This is just a wrapper for unregister_netdevice that takes | |
3431 | * the rtnl semaphore. In general you want to use this and not | |
3432 | * unregister_netdevice. | |
3433 | */ | |
3434 | void unregister_netdev(struct net_device *dev) | |
3435 | { | |
3436 | rtnl_lock(); | |
3437 | unregister_netdevice(dev); | |
3438 | rtnl_unlock(); | |
3439 | } | |
3440 | ||
3441 | EXPORT_SYMBOL(unregister_netdev); | |
3442 | ||
1da177e4 LT |
3443 | static int dev_cpu_callback(struct notifier_block *nfb, |
3444 | unsigned long action, | |
3445 | void *ocpu) | |
3446 | { | |
3447 | struct sk_buff **list_skb; | |
3448 | struct net_device **list_net; | |
3449 | struct sk_buff *skb; | |
3450 | unsigned int cpu, oldcpu = (unsigned long)ocpu; | |
3451 | struct softnet_data *sd, *oldsd; | |
3452 | ||
8bb78442 | 3453 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
1da177e4 LT |
3454 | return NOTIFY_OK; |
3455 | ||
3456 | local_irq_disable(); | |
3457 | cpu = smp_processor_id(); | |
3458 | sd = &per_cpu(softnet_data, cpu); | |
3459 | oldsd = &per_cpu(softnet_data, oldcpu); | |
3460 | ||
3461 | /* Find end of our completion_queue. */ | |
3462 | list_skb = &sd->completion_queue; | |
3463 | while (*list_skb) | |
3464 | list_skb = &(*list_skb)->next; | |
3465 | /* Append completion queue from offline CPU. */ | |
3466 | *list_skb = oldsd->completion_queue; | |
3467 | oldsd->completion_queue = NULL; | |
3468 | ||
3469 | /* Find end of our output_queue. */ | |
3470 | list_net = &sd->output_queue; | |
3471 | while (*list_net) | |
3472 | list_net = &(*list_net)->next_sched; | |
3473 | /* Append output queue from offline CPU. */ | |
3474 | *list_net = oldsd->output_queue; | |
3475 | oldsd->output_queue = NULL; | |
3476 | ||
3477 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
3478 | local_irq_enable(); | |
3479 | ||
3480 | /* Process offline CPU's input_pkt_queue */ | |
3481 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) | |
3482 | netif_rx(skb); | |
3483 | ||
3484 | return NOTIFY_OK; | |
3485 | } | |
1da177e4 | 3486 | |
db217334 CL |
3487 | #ifdef CONFIG_NET_DMA |
3488 | /** | |
3489 | * net_dma_rebalance - | |
3490 | * This is called when the number of channels allocated to the net_dma_client | |
3491 | * changes. The net_dma_client tries to have one DMA channel per CPU. | |
3492 | */ | |
3493 | static void net_dma_rebalance(void) | |
3494 | { | |
3495 | unsigned int cpu, i, n; | |
3496 | struct dma_chan *chan; | |
3497 | ||
db217334 CL |
3498 | if (net_dma_count == 0) { |
3499 | for_each_online_cpu(cpu) | |
29bbd72d | 3500 | rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL); |
db217334 CL |
3501 | return; |
3502 | } | |
3503 | ||
3504 | i = 0; | |
3505 | cpu = first_cpu(cpu_online_map); | |
3506 | ||
3507 | rcu_read_lock(); | |
3508 | list_for_each_entry(chan, &net_dma_client->channels, client_node) { | |
3509 | n = ((num_online_cpus() / net_dma_count) | |
3510 | + (i < (num_online_cpus() % net_dma_count) ? 1 : 0)); | |
3511 | ||
3512 | while(n) { | |
29bbd72d | 3513 | per_cpu(softnet_data, cpu).net_dma = chan; |
db217334 CL |
3514 | cpu = next_cpu(cpu, cpu_online_map); |
3515 | n--; | |
3516 | } | |
3517 | i++; | |
3518 | } | |
3519 | rcu_read_unlock(); | |
db217334 CL |
3520 | } |
3521 | ||
3522 | /** | |
3523 | * netdev_dma_event - event callback for the net_dma_client | |
3524 | * @client: should always be net_dma_client | |
f4b8ea78 RD |
3525 | * @chan: DMA channel for the event |
3526 | * @event: event type | |
db217334 CL |
3527 | */ |
3528 | static void netdev_dma_event(struct dma_client *client, struct dma_chan *chan, | |
3529 | enum dma_event event) | |
3530 | { | |
3531 | spin_lock(&net_dma_event_lock); | |
3532 | switch (event) { | |
3533 | case DMA_RESOURCE_ADDED: | |
3534 | net_dma_count++; | |
3535 | net_dma_rebalance(); | |
3536 | break; | |
3537 | case DMA_RESOURCE_REMOVED: | |
3538 | net_dma_count--; | |
3539 | net_dma_rebalance(); | |
3540 | break; | |
3541 | default: | |
3542 | break; | |
3543 | } | |
3544 | spin_unlock(&net_dma_event_lock); | |
3545 | } | |
3546 | ||
3547 | /** | |
3548 | * netdev_dma_regiser - register the networking subsystem as a DMA client | |
3549 | */ | |
3550 | static int __init netdev_dma_register(void) | |
3551 | { | |
3552 | spin_lock_init(&net_dma_event_lock); | |
3553 | net_dma_client = dma_async_client_register(netdev_dma_event); | |
3554 | if (net_dma_client == NULL) | |
3555 | return -ENOMEM; | |
3556 | ||
3557 | dma_async_client_chan_request(net_dma_client, num_online_cpus()); | |
3558 | return 0; | |
3559 | } | |
3560 | ||
3561 | #else | |
3562 | static int __init netdev_dma_register(void) { return -ENODEV; } | |
3563 | #endif /* CONFIG_NET_DMA */ | |
1da177e4 LT |
3564 | |
3565 | /* | |
3566 | * Initialize the DEV module. At boot time this walks the device list and | |
3567 | * unhooks any devices that fail to initialise (normally hardware not | |
3568 | * present) and leaves us with a valid list of present and active devices. | |
3569 | * | |
3570 | */ | |
3571 | ||
3572 | /* | |
3573 | * This is called single threaded during boot, so no need | |
3574 | * to take the rtnl semaphore. | |
3575 | */ | |
3576 | static int __init net_dev_init(void) | |
3577 | { | |
3578 | int i, rc = -ENOMEM; | |
3579 | ||
3580 | BUG_ON(!dev_boot_phase); | |
3581 | ||
1da177e4 LT |
3582 | if (dev_proc_init()) |
3583 | goto out; | |
3584 | ||
3585 | if (netdev_sysfs_init()) | |
3586 | goto out; | |
3587 | ||
3588 | INIT_LIST_HEAD(&ptype_all); | |
4ec93edb | 3589 | for (i = 0; i < 16; i++) |
1da177e4 LT |
3590 | INIT_LIST_HEAD(&ptype_base[i]); |
3591 | ||
3592 | for (i = 0; i < ARRAY_SIZE(dev_name_head); i++) | |
3593 | INIT_HLIST_HEAD(&dev_name_head[i]); | |
3594 | ||
3595 | for (i = 0; i < ARRAY_SIZE(dev_index_head); i++) | |
3596 | INIT_HLIST_HEAD(&dev_index_head[i]); | |
3597 | ||
3598 | /* | |
3599 | * Initialise the packet receive queues. | |
3600 | */ | |
3601 | ||
6f912042 | 3602 | for_each_possible_cpu(i) { |
1da177e4 LT |
3603 | struct softnet_data *queue; |
3604 | ||
3605 | queue = &per_cpu(softnet_data, i); | |
3606 | skb_queue_head_init(&queue->input_pkt_queue); | |
1da177e4 LT |
3607 | queue->completion_queue = NULL; |
3608 | INIT_LIST_HEAD(&queue->poll_list); | |
3609 | set_bit(__LINK_STATE_START, &queue->backlog_dev.state); | |
3610 | queue->backlog_dev.weight = weight_p; | |
3611 | queue->backlog_dev.poll = process_backlog; | |
3612 | atomic_set(&queue->backlog_dev.refcnt, 1); | |
3613 | } | |
3614 | ||
db217334 CL |
3615 | netdev_dma_register(); |
3616 | ||
1da177e4 LT |
3617 | dev_boot_phase = 0; |
3618 | ||
3619 | open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL); | |
3620 | open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL); | |
3621 | ||
3622 | hotcpu_notifier(dev_cpu_callback, 0); | |
3623 | dst_init(); | |
3624 | dev_mcast_init(); | |
3625 | rc = 0; | |
3626 | out: | |
3627 | return rc; | |
3628 | } | |
3629 | ||
3630 | subsys_initcall(net_dev_init); | |
3631 | ||
3632 | EXPORT_SYMBOL(__dev_get_by_index); | |
3633 | EXPORT_SYMBOL(__dev_get_by_name); | |
3634 | EXPORT_SYMBOL(__dev_remove_pack); | |
c2373ee9 | 3635 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
3636 | EXPORT_SYMBOL(dev_add_pack); |
3637 | EXPORT_SYMBOL(dev_alloc_name); | |
3638 | EXPORT_SYMBOL(dev_close); | |
3639 | EXPORT_SYMBOL(dev_get_by_flags); | |
3640 | EXPORT_SYMBOL(dev_get_by_index); | |
3641 | EXPORT_SYMBOL(dev_get_by_name); | |
1da177e4 LT |
3642 | EXPORT_SYMBOL(dev_open); |
3643 | EXPORT_SYMBOL(dev_queue_xmit); | |
3644 | EXPORT_SYMBOL(dev_remove_pack); | |
3645 | EXPORT_SYMBOL(dev_set_allmulti); | |
3646 | EXPORT_SYMBOL(dev_set_promiscuity); | |
3647 | EXPORT_SYMBOL(dev_change_flags); | |
3648 | EXPORT_SYMBOL(dev_set_mtu); | |
3649 | EXPORT_SYMBOL(dev_set_mac_address); | |
3650 | EXPORT_SYMBOL(free_netdev); | |
3651 | EXPORT_SYMBOL(netdev_boot_setup_check); | |
3652 | EXPORT_SYMBOL(netdev_set_master); | |
3653 | EXPORT_SYMBOL(netdev_state_change); | |
3654 | EXPORT_SYMBOL(netif_receive_skb); | |
3655 | EXPORT_SYMBOL(netif_rx); | |
3656 | EXPORT_SYMBOL(register_gifconf); | |
3657 | EXPORT_SYMBOL(register_netdevice); | |
3658 | EXPORT_SYMBOL(register_netdevice_notifier); | |
3659 | EXPORT_SYMBOL(skb_checksum_help); | |
3660 | EXPORT_SYMBOL(synchronize_net); | |
3661 | EXPORT_SYMBOL(unregister_netdevice); | |
3662 | EXPORT_SYMBOL(unregister_netdevice_notifier); | |
3663 | EXPORT_SYMBOL(net_enable_timestamp); | |
3664 | EXPORT_SYMBOL(net_disable_timestamp); | |
3665 | EXPORT_SYMBOL(dev_get_flags); | |
3666 | ||
3667 | #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) | |
3668 | EXPORT_SYMBOL(br_handle_frame_hook); | |
3669 | EXPORT_SYMBOL(br_fdb_get_hook); | |
3670 | EXPORT_SYMBOL(br_fdb_put_hook); | |
3671 | #endif | |
3672 | ||
3673 | #ifdef CONFIG_KMOD | |
3674 | EXPORT_SYMBOL(dev_load); | |
3675 | #endif | |
3676 | ||
3677 | EXPORT_PER_CPU_SYMBOL(softnet_data); |