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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> | |
101 | #include <linux/divert.h> | |
102 | #include <net/dst.h> | |
103 | #include <net/pkt_sched.h> | |
104 | #include <net/checksum.h> | |
105 | #include <linux/highmem.h> | |
106 | #include <linux/init.h> | |
107 | #include <linux/kmod.h> | |
108 | #include <linux/module.h> | |
109 | #include <linux/kallsyms.h> | |
110 | #include <linux/netpoll.h> | |
111 | #include <linux/rcupdate.h> | |
112 | #include <linux/delay.h> | |
d86b5e0e | 113 | #include <linux/wireless.h> |
1da177e4 | 114 | #include <net/iw_handler.h> |
1da177e4 | 115 | #include <asm/current.h> |
5bdb9886 | 116 | #include <linux/audit.h> |
db217334 | 117 | #include <linux/dmaengine.h> |
f6a78bfc | 118 | #include <linux/err.h> |
c7fa9d18 | 119 | #include <linux/ctype.h> |
1da177e4 | 120 | |
1da177e4 LT |
121 | /* |
122 | * The list of packet types we will receive (as opposed to discard) | |
123 | * and the routines to invoke. | |
124 | * | |
125 | * Why 16. Because with 16 the only overlap we get on a hash of the | |
126 | * low nibble of the protocol value is RARP/SNAP/X.25. | |
127 | * | |
128 | * NOTE: That is no longer true with the addition of VLAN tags. Not | |
129 | * sure which should go first, but I bet it won't make much | |
130 | * difference if we are running VLANs. The good news is that | |
131 | * this protocol won't be in the list unless compiled in, so | |
3041a069 | 132 | * the average user (w/out VLANs) will not be adversely affected. |
1da177e4 LT |
133 | * --BLG |
134 | * | |
135 | * 0800 IP | |
136 | * 8100 802.1Q VLAN | |
137 | * 0001 802.3 | |
138 | * 0002 AX.25 | |
139 | * 0004 802.2 | |
140 | * 8035 RARP | |
141 | * 0005 SNAP | |
142 | * 0805 X.25 | |
143 | * 0806 ARP | |
144 | * 8137 IPX | |
145 | * 0009 Localtalk | |
146 | * 86DD IPv6 | |
147 | */ | |
148 | ||
149 | static DEFINE_SPINLOCK(ptype_lock); | |
150 | static struct list_head ptype_base[16]; /* 16 way hashed list */ | |
151 | static struct list_head ptype_all; /* Taps */ | |
152 | ||
db217334 CL |
153 | #ifdef CONFIG_NET_DMA |
154 | static struct dma_client *net_dma_client; | |
155 | static unsigned int net_dma_count; | |
156 | static spinlock_t net_dma_event_lock; | |
157 | #endif | |
158 | ||
1da177e4 | 159 | /* |
3041a069 | 160 | * The @dev_base list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
161 | * semaphore. |
162 | * | |
163 | * Pure readers hold dev_base_lock for reading. | |
164 | * | |
165 | * Writers must hold the rtnl semaphore while they loop through the | |
166 | * dev_base list, and hold dev_base_lock for writing when they do the | |
167 | * actual updates. This allows pure readers to access the list even | |
168 | * while a writer is preparing to update it. | |
169 | * | |
170 | * To put it another way, dev_base_lock is held for writing only to | |
171 | * protect against pure readers; the rtnl semaphore provides the | |
172 | * protection against other writers. | |
173 | * | |
174 | * See, for example usages, register_netdevice() and | |
175 | * unregister_netdevice(), which must be called with the rtnl | |
176 | * semaphore held. | |
177 | */ | |
178 | struct net_device *dev_base; | |
179 | static struct net_device **dev_tail = &dev_base; | |
180 | DEFINE_RWLOCK(dev_base_lock); | |
181 | ||
182 | EXPORT_SYMBOL(dev_base); | |
183 | EXPORT_SYMBOL(dev_base_lock); | |
184 | ||
185 | #define NETDEV_HASHBITS 8 | |
186 | static struct hlist_head dev_name_head[1<<NETDEV_HASHBITS]; | |
187 | static struct hlist_head dev_index_head[1<<NETDEV_HASHBITS]; | |
188 | ||
189 | static inline struct hlist_head *dev_name_hash(const char *name) | |
190 | { | |
191 | unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); | |
192 | return &dev_name_head[hash & ((1<<NETDEV_HASHBITS)-1)]; | |
193 | } | |
194 | ||
195 | static inline struct hlist_head *dev_index_hash(int ifindex) | |
196 | { | |
197 | return &dev_index_head[ifindex & ((1<<NETDEV_HASHBITS)-1)]; | |
198 | } | |
199 | ||
200 | /* | |
201 | * Our notifier list | |
202 | */ | |
203 | ||
f07d5b94 | 204 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
205 | |
206 | /* | |
207 | * Device drivers call our routines to queue packets here. We empty the | |
208 | * queue in the local softnet handler. | |
209 | */ | |
31aa02c5 | 210 | DEFINE_PER_CPU(struct softnet_data, softnet_data) = { NULL }; |
1da177e4 LT |
211 | |
212 | #ifdef CONFIG_SYSFS | |
213 | extern int netdev_sysfs_init(void); | |
214 | extern int netdev_register_sysfs(struct net_device *); | |
215 | extern void netdev_unregister_sysfs(struct net_device *); | |
216 | #else | |
217 | #define netdev_sysfs_init() (0) | |
218 | #define netdev_register_sysfs(dev) (0) | |
219 | #define netdev_unregister_sysfs(dev) do { } while(0) | |
220 | #endif | |
221 | ||
222 | ||
223 | /******************************************************************************* | |
224 | ||
225 | Protocol management and registration routines | |
226 | ||
227 | *******************************************************************************/ | |
228 | ||
229 | /* | |
230 | * For efficiency | |
231 | */ | |
232 | ||
60481264 | 233 | static int netdev_nit; |
1da177e4 LT |
234 | |
235 | /* | |
236 | * Add a protocol ID to the list. Now that the input handler is | |
237 | * smarter we can dispense with all the messy stuff that used to be | |
238 | * here. | |
239 | * | |
240 | * BEWARE!!! Protocol handlers, mangling input packets, | |
241 | * MUST BE last in hash buckets and checking protocol handlers | |
242 | * MUST start from promiscuous ptype_all chain in net_bh. | |
243 | * It is true now, do not change it. | |
244 | * Explanation follows: if protocol handler, mangling packet, will | |
245 | * be the first on list, it is not able to sense, that packet | |
246 | * is cloned and should be copied-on-write, so that it will | |
247 | * change it and subsequent readers will get broken packet. | |
248 | * --ANK (980803) | |
249 | */ | |
250 | ||
251 | /** | |
252 | * dev_add_pack - add packet handler | |
253 | * @pt: packet type declaration | |
254 | * | |
255 | * Add a protocol handler to the networking stack. The passed &packet_type | |
256 | * is linked into kernel lists and may not be freed until it has been | |
257 | * removed from the kernel lists. | |
258 | * | |
259 | * This call does not sleep therefore it can not | |
260 | * guarantee all CPU's that are in middle of receiving packets | |
261 | * will see the new packet type (until the next received packet). | |
262 | */ | |
263 | ||
264 | void dev_add_pack(struct packet_type *pt) | |
265 | { | |
266 | int hash; | |
267 | ||
268 | spin_lock_bh(&ptype_lock); | |
269 | if (pt->type == htons(ETH_P_ALL)) { | |
270 | netdev_nit++; | |
271 | list_add_rcu(&pt->list, &ptype_all); | |
272 | } else { | |
273 | hash = ntohs(pt->type) & 15; | |
274 | list_add_rcu(&pt->list, &ptype_base[hash]); | |
275 | } | |
276 | spin_unlock_bh(&ptype_lock); | |
277 | } | |
278 | ||
1da177e4 LT |
279 | /** |
280 | * __dev_remove_pack - remove packet handler | |
281 | * @pt: packet type declaration | |
282 | * | |
283 | * Remove a protocol handler that was previously added to the kernel | |
284 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
285 | * from the kernel lists and can be freed or reused once this function | |
286 | * returns. | |
287 | * | |
288 | * The packet type might still be in use by receivers | |
289 | * and must not be freed until after all the CPU's have gone | |
290 | * through a quiescent state. | |
291 | */ | |
292 | void __dev_remove_pack(struct packet_type *pt) | |
293 | { | |
294 | struct list_head *head; | |
295 | struct packet_type *pt1; | |
296 | ||
297 | spin_lock_bh(&ptype_lock); | |
298 | ||
299 | if (pt->type == htons(ETH_P_ALL)) { | |
300 | netdev_nit--; | |
301 | head = &ptype_all; | |
302 | } else | |
303 | head = &ptype_base[ntohs(pt->type) & 15]; | |
304 | ||
305 | list_for_each_entry(pt1, head, list) { | |
306 | if (pt == pt1) { | |
307 | list_del_rcu(&pt->list); | |
308 | goto out; | |
309 | } | |
310 | } | |
311 | ||
312 | printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt); | |
313 | out: | |
314 | spin_unlock_bh(&ptype_lock); | |
315 | } | |
316 | /** | |
317 | * dev_remove_pack - remove packet handler | |
318 | * @pt: packet type declaration | |
319 | * | |
320 | * Remove a protocol handler that was previously added to the kernel | |
321 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
322 | * from the kernel lists and can be freed or reused once this function | |
323 | * returns. | |
324 | * | |
325 | * This call sleeps to guarantee that no CPU is looking at the packet | |
326 | * type after return. | |
327 | */ | |
328 | void dev_remove_pack(struct packet_type *pt) | |
329 | { | |
330 | __dev_remove_pack(pt); | |
331 | ||
332 | synchronize_net(); | |
333 | } | |
334 | ||
335 | /****************************************************************************** | |
336 | ||
337 | Device Boot-time Settings Routines | |
338 | ||
339 | *******************************************************************************/ | |
340 | ||
341 | /* Boot time configuration table */ | |
342 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
343 | ||
344 | /** | |
345 | * netdev_boot_setup_add - add new setup entry | |
346 | * @name: name of the device | |
347 | * @map: configured settings for the device | |
348 | * | |
349 | * Adds new setup entry to the dev_boot_setup list. The function | |
350 | * returns 0 on error and 1 on success. This is a generic routine to | |
351 | * all netdevices. | |
352 | */ | |
353 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
354 | { | |
355 | struct netdev_boot_setup *s; | |
356 | int i; | |
357 | ||
358 | s = dev_boot_setup; | |
359 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
360 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
361 | memset(s[i].name, 0, sizeof(s[i].name)); | |
362 | strcpy(s[i].name, name); | |
363 | memcpy(&s[i].map, map, sizeof(s[i].map)); | |
364 | break; | |
365 | } | |
366 | } | |
367 | ||
368 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
369 | } | |
370 | ||
371 | /** | |
372 | * netdev_boot_setup_check - check boot time settings | |
373 | * @dev: the netdevice | |
374 | * | |
375 | * Check boot time settings for the device. | |
376 | * The found settings are set for the device to be used | |
377 | * later in the device probing. | |
378 | * Returns 0 if no settings found, 1 if they are. | |
379 | */ | |
380 | int netdev_boot_setup_check(struct net_device *dev) | |
381 | { | |
382 | struct netdev_boot_setup *s = dev_boot_setup; | |
383 | int i; | |
384 | ||
385 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
386 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
387 | !strncmp(dev->name, s[i].name, strlen(s[i].name))) { | |
388 | dev->irq = s[i].map.irq; | |
389 | dev->base_addr = s[i].map.base_addr; | |
390 | dev->mem_start = s[i].map.mem_start; | |
391 | dev->mem_end = s[i].map.mem_end; | |
392 | return 1; | |
393 | } | |
394 | } | |
395 | return 0; | |
396 | } | |
397 | ||
398 | ||
399 | /** | |
400 | * netdev_boot_base - get address from boot time settings | |
401 | * @prefix: prefix for network device | |
402 | * @unit: id for network device | |
403 | * | |
404 | * Check boot time settings for the base address of device. | |
405 | * The found settings are set for the device to be used | |
406 | * later in the device probing. | |
407 | * Returns 0 if no settings found. | |
408 | */ | |
409 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
410 | { | |
411 | const struct netdev_boot_setup *s = dev_boot_setup; | |
412 | char name[IFNAMSIZ]; | |
413 | int i; | |
414 | ||
415 | sprintf(name, "%s%d", prefix, unit); | |
416 | ||
417 | /* | |
418 | * If device already registered then return base of 1 | |
419 | * to indicate not to probe for this interface | |
420 | */ | |
421 | if (__dev_get_by_name(name)) | |
422 | return 1; | |
423 | ||
424 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
425 | if (!strcmp(name, s[i].name)) | |
426 | return s[i].map.base_addr; | |
427 | return 0; | |
428 | } | |
429 | ||
430 | /* | |
431 | * Saves at boot time configured settings for any netdevice. | |
432 | */ | |
433 | int __init netdev_boot_setup(char *str) | |
434 | { | |
435 | int ints[5]; | |
436 | struct ifmap map; | |
437 | ||
438 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
439 | if (!str || !*str) | |
440 | return 0; | |
441 | ||
442 | /* Save settings */ | |
443 | memset(&map, 0, sizeof(map)); | |
444 | if (ints[0] > 0) | |
445 | map.irq = ints[1]; | |
446 | if (ints[0] > 1) | |
447 | map.base_addr = ints[2]; | |
448 | if (ints[0] > 2) | |
449 | map.mem_start = ints[3]; | |
450 | if (ints[0] > 3) | |
451 | map.mem_end = ints[4]; | |
452 | ||
453 | /* Add new entry to the list */ | |
454 | return netdev_boot_setup_add(str, &map); | |
455 | } | |
456 | ||
457 | __setup("netdev=", netdev_boot_setup); | |
458 | ||
459 | /******************************************************************************* | |
460 | ||
461 | Device Interface Subroutines | |
462 | ||
463 | *******************************************************************************/ | |
464 | ||
465 | /** | |
466 | * __dev_get_by_name - find a device by its name | |
467 | * @name: name to find | |
468 | * | |
469 | * Find an interface by name. Must be called under RTNL semaphore | |
470 | * or @dev_base_lock. If the name is found a pointer to the device | |
471 | * is returned. If the name is not found then %NULL is returned. The | |
472 | * reference counters are not incremented so the caller must be | |
473 | * careful with locks. | |
474 | */ | |
475 | ||
476 | struct net_device *__dev_get_by_name(const char *name) | |
477 | { | |
478 | struct hlist_node *p; | |
479 | ||
480 | hlist_for_each(p, dev_name_hash(name)) { | |
481 | struct net_device *dev | |
482 | = hlist_entry(p, struct net_device, name_hlist); | |
483 | if (!strncmp(dev->name, name, IFNAMSIZ)) | |
484 | return dev; | |
485 | } | |
486 | return NULL; | |
487 | } | |
488 | ||
489 | /** | |
490 | * dev_get_by_name - find a device by its name | |
491 | * @name: name to find | |
492 | * | |
493 | * Find an interface by name. This can be called from any | |
494 | * context and does its own locking. The returned handle has | |
495 | * the usage count incremented and the caller must use dev_put() to | |
496 | * release it when it is no longer needed. %NULL is returned if no | |
497 | * matching device is found. | |
498 | */ | |
499 | ||
500 | struct net_device *dev_get_by_name(const char *name) | |
501 | { | |
502 | struct net_device *dev; | |
503 | ||
504 | read_lock(&dev_base_lock); | |
505 | dev = __dev_get_by_name(name); | |
506 | if (dev) | |
507 | dev_hold(dev); | |
508 | read_unlock(&dev_base_lock); | |
509 | return dev; | |
510 | } | |
511 | ||
512 | /** | |
513 | * __dev_get_by_index - find a device by its ifindex | |
514 | * @ifindex: index of device | |
515 | * | |
516 | * Search for an interface by index. Returns %NULL if the device | |
517 | * is not found or a pointer to the device. The device has not | |
518 | * had its reference counter increased so the caller must be careful | |
519 | * about locking. The caller must hold either the RTNL semaphore | |
520 | * or @dev_base_lock. | |
521 | */ | |
522 | ||
523 | struct net_device *__dev_get_by_index(int ifindex) | |
524 | { | |
525 | struct hlist_node *p; | |
526 | ||
527 | hlist_for_each(p, dev_index_hash(ifindex)) { | |
528 | struct net_device *dev | |
529 | = hlist_entry(p, struct net_device, index_hlist); | |
530 | if (dev->ifindex == ifindex) | |
531 | return dev; | |
532 | } | |
533 | return NULL; | |
534 | } | |
535 | ||
536 | ||
537 | /** | |
538 | * dev_get_by_index - find a device by its ifindex | |
539 | * @ifindex: index of device | |
540 | * | |
541 | * Search for an interface by index. Returns NULL if the device | |
542 | * is not found or a pointer to the device. The device returned has | |
543 | * had a reference added and the pointer is safe until the user calls | |
544 | * dev_put to indicate they have finished with it. | |
545 | */ | |
546 | ||
547 | struct net_device *dev_get_by_index(int ifindex) | |
548 | { | |
549 | struct net_device *dev; | |
550 | ||
551 | read_lock(&dev_base_lock); | |
552 | dev = __dev_get_by_index(ifindex); | |
553 | if (dev) | |
554 | dev_hold(dev); | |
555 | read_unlock(&dev_base_lock); | |
556 | return dev; | |
557 | } | |
558 | ||
559 | /** | |
560 | * dev_getbyhwaddr - find a device by its hardware address | |
561 | * @type: media type of device | |
562 | * @ha: hardware address | |
563 | * | |
564 | * Search for an interface by MAC address. Returns NULL if the device | |
565 | * is not found or a pointer to the device. The caller must hold the | |
566 | * rtnl semaphore. The returned device has not had its ref count increased | |
567 | * and the caller must therefore be careful about locking | |
568 | * | |
569 | * BUGS: | |
570 | * If the API was consistent this would be __dev_get_by_hwaddr | |
571 | */ | |
572 | ||
573 | struct net_device *dev_getbyhwaddr(unsigned short type, char *ha) | |
574 | { | |
575 | struct net_device *dev; | |
576 | ||
577 | ASSERT_RTNL(); | |
578 | ||
579 | for (dev = dev_base; dev; dev = dev->next) | |
580 | if (dev->type == type && | |
581 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
582 | break; | |
583 | return dev; | |
584 | } | |
585 | ||
cf309e3f JF |
586 | EXPORT_SYMBOL(dev_getbyhwaddr); |
587 | ||
1da177e4 LT |
588 | struct net_device *dev_getfirstbyhwtype(unsigned short type) |
589 | { | |
590 | struct net_device *dev; | |
591 | ||
592 | rtnl_lock(); | |
593 | for (dev = dev_base; dev; dev = dev->next) { | |
594 | if (dev->type == type) { | |
595 | dev_hold(dev); | |
596 | break; | |
597 | } | |
598 | } | |
599 | rtnl_unlock(); | |
600 | return dev; | |
601 | } | |
602 | ||
603 | EXPORT_SYMBOL(dev_getfirstbyhwtype); | |
604 | ||
605 | /** | |
606 | * dev_get_by_flags - find any device with given flags | |
607 | * @if_flags: IFF_* values | |
608 | * @mask: bitmask of bits in if_flags to check | |
609 | * | |
610 | * Search for any interface with the given flags. Returns NULL if a device | |
611 | * is not found or a pointer to the device. The device returned has | |
612 | * had a reference added and the pointer is safe until the user calls | |
613 | * dev_put to indicate they have finished with it. | |
614 | */ | |
615 | ||
616 | struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mask) | |
617 | { | |
618 | struct net_device *dev; | |
619 | ||
620 | read_lock(&dev_base_lock); | |
621 | for (dev = dev_base; dev != NULL; dev = dev->next) { | |
622 | if (((dev->flags ^ if_flags) & mask) == 0) { | |
623 | dev_hold(dev); | |
624 | break; | |
625 | } | |
626 | } | |
627 | read_unlock(&dev_base_lock); | |
628 | return dev; | |
629 | } | |
630 | ||
631 | /** | |
632 | * dev_valid_name - check if name is okay for network device | |
633 | * @name: name string | |
634 | * | |
635 | * Network device names need to be valid file names to | |
c7fa9d18 DM |
636 | * to allow sysfs to work. We also disallow any kind of |
637 | * whitespace. | |
1da177e4 | 638 | */ |
c2373ee9 | 639 | int dev_valid_name(const char *name) |
1da177e4 | 640 | { |
c7fa9d18 DM |
641 | if (*name == '\0') |
642 | return 0; | |
b6fe17d6 SH |
643 | if (strlen(name) >= IFNAMSIZ) |
644 | return 0; | |
c7fa9d18 DM |
645 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
646 | return 0; | |
647 | ||
648 | while (*name) { | |
649 | if (*name == '/' || isspace(*name)) | |
650 | return 0; | |
651 | name++; | |
652 | } | |
653 | return 1; | |
1da177e4 LT |
654 | } |
655 | ||
656 | /** | |
657 | * dev_alloc_name - allocate a name for a device | |
658 | * @dev: device | |
659 | * @name: name format string | |
660 | * | |
661 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
662 | * id. It scans list of devices to build up a free map, then chooses |
663 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
664 | * while allocating the name and adding the device in order to avoid | |
665 | * duplicates. | |
666 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
667 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
668 | */ |
669 | ||
670 | int dev_alloc_name(struct net_device *dev, const char *name) | |
671 | { | |
672 | int i = 0; | |
673 | char buf[IFNAMSIZ]; | |
674 | const char *p; | |
675 | const int max_netdevices = 8*PAGE_SIZE; | |
676 | long *inuse; | |
677 | struct net_device *d; | |
678 | ||
679 | p = strnchr(name, IFNAMSIZ-1, '%'); | |
680 | if (p) { | |
681 | /* | |
682 | * Verify the string as this thing may have come from | |
683 | * the user. There must be either one "%d" and no other "%" | |
684 | * characters. | |
685 | */ | |
686 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
687 | return -EINVAL; | |
688 | ||
689 | /* Use one page as a bit array of possible slots */ | |
690 | inuse = (long *) get_zeroed_page(GFP_ATOMIC); | |
691 | if (!inuse) | |
692 | return -ENOMEM; | |
693 | ||
694 | for (d = dev_base; d; d = d->next) { | |
695 | if (!sscanf(d->name, name, &i)) | |
696 | continue; | |
697 | if (i < 0 || i >= max_netdevices) | |
698 | continue; | |
699 | ||
700 | /* avoid cases where sscanf is not exact inverse of printf */ | |
701 | snprintf(buf, sizeof(buf), name, i); | |
702 | if (!strncmp(buf, d->name, IFNAMSIZ)) | |
703 | set_bit(i, inuse); | |
704 | } | |
705 | ||
706 | i = find_first_zero_bit(inuse, max_netdevices); | |
707 | free_page((unsigned long) inuse); | |
708 | } | |
709 | ||
710 | snprintf(buf, sizeof(buf), name, i); | |
711 | if (!__dev_get_by_name(buf)) { | |
712 | strlcpy(dev->name, buf, IFNAMSIZ); | |
713 | return i; | |
714 | } | |
715 | ||
716 | /* It is possible to run out of possible slots | |
717 | * when the name is long and there isn't enough space left | |
718 | * for the digits, or if all bits are used. | |
719 | */ | |
720 | return -ENFILE; | |
721 | } | |
722 | ||
723 | ||
724 | /** | |
725 | * dev_change_name - change name of a device | |
726 | * @dev: device | |
727 | * @newname: name (or format string) must be at least IFNAMSIZ | |
728 | * | |
729 | * Change name of a device, can pass format strings "eth%d". | |
730 | * for wildcarding. | |
731 | */ | |
732 | int dev_change_name(struct net_device *dev, char *newname) | |
733 | { | |
734 | int err = 0; | |
735 | ||
736 | ASSERT_RTNL(); | |
737 | ||
738 | if (dev->flags & IFF_UP) | |
739 | return -EBUSY; | |
740 | ||
741 | if (!dev_valid_name(newname)) | |
742 | return -EINVAL; | |
743 | ||
744 | if (strchr(newname, '%')) { | |
745 | err = dev_alloc_name(dev, newname); | |
746 | if (err < 0) | |
747 | return err; | |
748 | strcpy(newname, dev->name); | |
749 | } | |
750 | else if (__dev_get_by_name(newname)) | |
751 | return -EEXIST; | |
752 | else | |
753 | strlcpy(dev->name, newname, IFNAMSIZ); | |
754 | ||
755 | err = class_device_rename(&dev->class_dev, dev->name); | |
756 | if (!err) { | |
757 | hlist_del(&dev->name_hlist); | |
758 | hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name)); | |
f07d5b94 | 759 | raw_notifier_call_chain(&netdev_chain, |
e041c683 | 760 | NETDEV_CHANGENAME, dev); |
1da177e4 LT |
761 | } |
762 | ||
763 | return err; | |
764 | } | |
765 | ||
d8a33ac4 | 766 | /** |
3041a069 | 767 | * netdev_features_change - device changes features |
d8a33ac4 SH |
768 | * @dev: device to cause notification |
769 | * | |
770 | * Called to indicate a device has changed features. | |
771 | */ | |
772 | void netdev_features_change(struct net_device *dev) | |
773 | { | |
f07d5b94 | 774 | raw_notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
775 | } |
776 | EXPORT_SYMBOL(netdev_features_change); | |
777 | ||
1da177e4 LT |
778 | /** |
779 | * netdev_state_change - device changes state | |
780 | * @dev: device to cause notification | |
781 | * | |
782 | * Called to indicate a device has changed state. This function calls | |
783 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
784 | * to the routing socket. | |
785 | */ | |
786 | void netdev_state_change(struct net_device *dev) | |
787 | { | |
788 | if (dev->flags & IFF_UP) { | |
f07d5b94 | 789 | raw_notifier_call_chain(&netdev_chain, |
e041c683 | 790 | NETDEV_CHANGE, dev); |
1da177e4 LT |
791 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); |
792 | } | |
793 | } | |
794 | ||
795 | /** | |
796 | * dev_load - load a network module | |
797 | * @name: name of interface | |
798 | * | |
799 | * If a network interface is not present and the process has suitable | |
800 | * privileges this function loads the module. If module loading is not | |
801 | * available in this kernel then it becomes a nop. | |
802 | */ | |
803 | ||
804 | void dev_load(const char *name) | |
805 | { | |
806 | struct net_device *dev; | |
807 | ||
808 | read_lock(&dev_base_lock); | |
809 | dev = __dev_get_by_name(name); | |
810 | read_unlock(&dev_base_lock); | |
811 | ||
812 | if (!dev && capable(CAP_SYS_MODULE)) | |
813 | request_module("%s", name); | |
814 | } | |
815 | ||
816 | static int default_rebuild_header(struct sk_buff *skb) | |
817 | { | |
818 | printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n", | |
819 | skb->dev ? skb->dev->name : "NULL!!!"); | |
820 | kfree_skb(skb); | |
821 | return 1; | |
822 | } | |
823 | ||
824 | ||
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 | ||
864 | /* | |
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 | |
968 | * to the new notifier to allow device to have a race free | |
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 LT |
979 | if (!err) { |
980 | for (dev = dev_base; dev; dev = dev->next) { | |
981 | nb->notifier_call(nb, NETDEV_REGISTER, dev); | |
982 | ||
983 | if (dev->flags & IFF_UP) | |
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 PM |
1038 | void __net_timestamp(struct sk_buff *skb) |
1039 | { | |
1040 | struct timeval tv; | |
1041 | ||
1042 | do_gettimeofday(&tv); | |
1043 | skb_set_timestamp(skb, &tv); | |
1044 | } | |
1045 | EXPORT_SYMBOL(__net_timestamp); | |
1046 | ||
1047 | static inline void net_timestamp(struct sk_buff *skb) | |
1da177e4 LT |
1048 | { |
1049 | if (atomic_read(&netstamp_needed)) | |
a61bbcf2 | 1050 | __net_timestamp(skb); |
1da177e4 | 1051 | else { |
a61bbcf2 PM |
1052 | skb->tstamp.off_sec = 0; |
1053 | skb->tstamp.off_usec = 0; | |
1da177e4 LT |
1054 | } |
1055 | } | |
1056 | ||
1057 | /* | |
1058 | * Support routine. Sends outgoing frames to any network | |
1059 | * taps currently in use. | |
1060 | */ | |
1061 | ||
f6a78bfc | 1062 | static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
1063 | { |
1064 | struct packet_type *ptype; | |
a61bbcf2 PM |
1065 | |
1066 | net_timestamp(skb); | |
1da177e4 LT |
1067 | |
1068 | rcu_read_lock(); | |
1069 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
1070 | /* Never send packets back to the socket | |
1071 | * they originated from - MvS (miquels@drinkel.ow.org) | |
1072 | */ | |
1073 | if ((ptype->dev == dev || !ptype->dev) && | |
1074 | (ptype->af_packet_priv == NULL || | |
1075 | (struct sock *)ptype->af_packet_priv != skb->sk)) { | |
1076 | struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC); | |
1077 | if (!skb2) | |
1078 | break; | |
1079 | ||
1080 | /* skb->nh should be correctly | |
1081 | set by sender, so that the second statement is | |
1082 | just protection against buggy protocols. | |
1083 | */ | |
1084 | skb2->mac.raw = skb2->data; | |
1085 | ||
1086 | if (skb2->nh.raw < skb2->data || | |
1087 | skb2->nh.raw > skb2->tail) { | |
1088 | if (net_ratelimit()) | |
1089 | printk(KERN_CRIT "protocol %04x is " | |
1090 | "buggy, dev %s\n", | |
1091 | skb2->protocol, dev->name); | |
1092 | skb2->nh.raw = skb2->data; | |
1093 | } | |
1094 | ||
1095 | skb2->h.raw = skb2->nh.raw; | |
1096 | skb2->pkt_type = PACKET_OUTGOING; | |
f2ccd8fa | 1097 | ptype->func(skb2, skb->dev, ptype, skb->dev); |
1da177e4 LT |
1098 | } |
1099 | } | |
1100 | rcu_read_unlock(); | |
1101 | } | |
1102 | ||
56079431 DV |
1103 | |
1104 | void __netif_schedule(struct net_device *dev) | |
1105 | { | |
1106 | if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) { | |
1107 | unsigned long flags; | |
1108 | struct softnet_data *sd; | |
1109 | ||
1110 | local_irq_save(flags); | |
1111 | sd = &__get_cpu_var(softnet_data); | |
1112 | dev->next_sched = sd->output_queue; | |
1113 | sd->output_queue = dev; | |
1114 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
1115 | local_irq_restore(flags); | |
1116 | } | |
1117 | } | |
1118 | EXPORT_SYMBOL(__netif_schedule); | |
1119 | ||
1120 | void __netif_rx_schedule(struct net_device *dev) | |
1121 | { | |
1122 | unsigned long flags; | |
1123 | ||
1124 | local_irq_save(flags); | |
1125 | dev_hold(dev); | |
1126 | list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); | |
1127 | if (dev->quota < 0) | |
1128 | dev->quota += dev->weight; | |
1129 | else | |
1130 | dev->quota = dev->weight; | |
1131 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
1132 | local_irq_restore(flags); | |
1133 | } | |
1134 | EXPORT_SYMBOL(__netif_rx_schedule); | |
1135 | ||
1136 | void dev_kfree_skb_any(struct sk_buff *skb) | |
1137 | { | |
1138 | if (in_irq() || irqs_disabled()) | |
1139 | dev_kfree_skb_irq(skb); | |
1140 | else | |
1141 | dev_kfree_skb(skb); | |
1142 | } | |
1143 | EXPORT_SYMBOL(dev_kfree_skb_any); | |
1144 | ||
1145 | ||
1146 | /* Hot-plugging. */ | |
1147 | void netif_device_detach(struct net_device *dev) | |
1148 | { | |
1149 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
1150 | netif_running(dev)) { | |
1151 | netif_stop_queue(dev); | |
1152 | } | |
1153 | } | |
1154 | EXPORT_SYMBOL(netif_device_detach); | |
1155 | ||
1156 | void netif_device_attach(struct net_device *dev) | |
1157 | { | |
1158 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
1159 | netif_running(dev)) { | |
1160 | netif_wake_queue(dev); | |
1161 | __netdev_watchdog_up(dev); | |
1162 | } | |
1163 | } | |
1164 | EXPORT_SYMBOL(netif_device_attach); | |
1165 | ||
1166 | ||
1da177e4 LT |
1167 | /* |
1168 | * Invalidate hardware checksum when packet is to be mangled, and | |
1169 | * complete checksum manually on outgoing path. | |
1170 | */ | |
84fa7933 | 1171 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 LT |
1172 | { |
1173 | unsigned int csum; | |
1174 | int ret = 0, offset = skb->h.raw - skb->data; | |
1175 | ||
84fa7933 | 1176 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
1177 | goto out_set_summed; |
1178 | ||
1179 | if (unlikely(skb_shinfo(skb)->gso_size)) { | |
a430a43d HX |
1180 | /* Let GSO fix up the checksum. */ |
1181 | goto out_set_summed; | |
1da177e4 LT |
1182 | } |
1183 | ||
1184 | if (skb_cloned(skb)) { | |
1185 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); | |
1186 | if (ret) | |
1187 | goto out; | |
1188 | } | |
1189 | ||
09a62660 | 1190 | BUG_ON(offset > (int)skb->len); |
1da177e4 LT |
1191 | csum = skb_checksum(skb, offset, skb->len-offset, 0); |
1192 | ||
1193 | offset = skb->tail - skb->h.raw; | |
09a62660 KK |
1194 | BUG_ON(offset <= 0); |
1195 | BUG_ON(skb->csum + 2 > offset); | |
1da177e4 LT |
1196 | |
1197 | *(u16*)(skb->h.raw + skb->csum) = csum_fold(csum); | |
a430a43d HX |
1198 | |
1199 | out_set_summed: | |
1da177e4 LT |
1200 | skb->ip_summed = CHECKSUM_NONE; |
1201 | out: | |
1202 | return ret; | |
1203 | } | |
1204 | ||
f6a78bfc HX |
1205 | /** |
1206 | * skb_gso_segment - Perform segmentation on skb. | |
1207 | * @skb: buffer to segment | |
576a30eb | 1208 | * @features: features for the output path (see dev->features) |
f6a78bfc HX |
1209 | * |
1210 | * This function segments the given skb and returns a list of segments. | |
576a30eb HX |
1211 | * |
1212 | * It may return NULL if the skb requires no segmentation. This is | |
1213 | * only possible when GSO is used for verifying header integrity. | |
f6a78bfc | 1214 | */ |
576a30eb | 1215 | struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features) |
f6a78bfc HX |
1216 | { |
1217 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
1218 | struct packet_type *ptype; | |
1219 | int type = skb->protocol; | |
a430a43d | 1220 | int err; |
f6a78bfc HX |
1221 | |
1222 | BUG_ON(skb_shinfo(skb)->frag_list); | |
f6a78bfc HX |
1223 | |
1224 | skb->mac.raw = skb->data; | |
1225 | skb->mac_len = skb->nh.raw - skb->data; | |
1226 | __skb_pull(skb, skb->mac_len); | |
1227 | ||
84fa7933 | 1228 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
a430a43d HX |
1229 | if (skb_header_cloned(skb) && |
1230 | (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) | |
1231 | return ERR_PTR(err); | |
1232 | } | |
1233 | ||
f6a78bfc HX |
1234 | rcu_read_lock(); |
1235 | list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type) & 15], list) { | |
1236 | if (ptype->type == type && !ptype->dev && ptype->gso_segment) { | |
84fa7933 | 1237 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
a430a43d HX |
1238 | err = ptype->gso_send_check(skb); |
1239 | segs = ERR_PTR(err); | |
1240 | if (err || skb_gso_ok(skb, features)) | |
1241 | break; | |
1242 | __skb_push(skb, skb->data - skb->nh.raw); | |
1243 | } | |
576a30eb | 1244 | segs = ptype->gso_segment(skb, features); |
f6a78bfc HX |
1245 | break; |
1246 | } | |
1247 | } | |
1248 | rcu_read_unlock(); | |
1249 | ||
576a30eb HX |
1250 | __skb_push(skb, skb->data - skb->mac.raw); |
1251 | ||
f6a78bfc HX |
1252 | return segs; |
1253 | } | |
1254 | ||
1255 | EXPORT_SYMBOL(skb_gso_segment); | |
1256 | ||
fb286bb2 HX |
1257 | /* Take action when hardware reception checksum errors are detected. */ |
1258 | #ifdef CONFIG_BUG | |
1259 | void netdev_rx_csum_fault(struct net_device *dev) | |
1260 | { | |
1261 | if (net_ratelimit()) { | |
246a4212 SH |
1262 | printk(KERN_ERR "%s: hw csum failure.\n", |
1263 | dev ? dev->name : "<unknown>"); | |
fb286bb2 HX |
1264 | dump_stack(); |
1265 | } | |
1266 | } | |
1267 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
1268 | #endif | |
1269 | ||
1da177e4 LT |
1270 | /* Actually, we should eliminate this check as soon as we know, that: |
1271 | * 1. IOMMU is present and allows to map all the memory. | |
1272 | * 2. No high memory really exists on this machine. | |
1273 | */ | |
1274 | ||
1275 | static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb) | |
1276 | { | |
3d3a8533 | 1277 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
1278 | int i; |
1279 | ||
1280 | if (dev->features & NETIF_F_HIGHDMA) | |
1281 | return 0; | |
1282 | ||
1283 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) | |
1284 | if (PageHighMem(skb_shinfo(skb)->frags[i].page)) | |
1285 | return 1; | |
1286 | ||
3d3a8533 | 1287 | #endif |
1da177e4 LT |
1288 | return 0; |
1289 | } | |
1da177e4 | 1290 | |
f6a78bfc HX |
1291 | struct dev_gso_cb { |
1292 | void (*destructor)(struct sk_buff *skb); | |
1293 | }; | |
1294 | ||
1295 | #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) | |
1296 | ||
1297 | static void dev_gso_skb_destructor(struct sk_buff *skb) | |
1298 | { | |
1299 | struct dev_gso_cb *cb; | |
1300 | ||
1301 | do { | |
1302 | struct sk_buff *nskb = skb->next; | |
1303 | ||
1304 | skb->next = nskb->next; | |
1305 | nskb->next = NULL; | |
1306 | kfree_skb(nskb); | |
1307 | } while (skb->next); | |
1308 | ||
1309 | cb = DEV_GSO_CB(skb); | |
1310 | if (cb->destructor) | |
1311 | cb->destructor(skb); | |
1312 | } | |
1313 | ||
1314 | /** | |
1315 | * dev_gso_segment - Perform emulated hardware segmentation on skb. | |
1316 | * @skb: buffer to segment | |
1317 | * | |
1318 | * This function segments the given skb and stores the list of segments | |
1319 | * in skb->next. | |
1320 | */ | |
1321 | static int dev_gso_segment(struct sk_buff *skb) | |
1322 | { | |
1323 | struct net_device *dev = skb->dev; | |
1324 | struct sk_buff *segs; | |
576a30eb HX |
1325 | int features = dev->features & ~(illegal_highdma(dev, skb) ? |
1326 | NETIF_F_SG : 0); | |
1327 | ||
1328 | segs = skb_gso_segment(skb, features); | |
1329 | ||
1330 | /* Verifying header integrity only. */ | |
1331 | if (!segs) | |
1332 | return 0; | |
f6a78bfc | 1333 | |
f6a78bfc HX |
1334 | if (unlikely(IS_ERR(segs))) |
1335 | return PTR_ERR(segs); | |
1336 | ||
1337 | skb->next = segs; | |
1338 | DEV_GSO_CB(skb)->destructor = skb->destructor; | |
1339 | skb->destructor = dev_gso_skb_destructor; | |
1340 | ||
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
1345 | { | |
1346 | if (likely(!skb->next)) { | |
1347 | if (netdev_nit) | |
1348 | dev_queue_xmit_nit(skb, dev); | |
1349 | ||
576a30eb HX |
1350 | if (netif_needs_gso(dev, skb)) { |
1351 | if (unlikely(dev_gso_segment(skb))) | |
1352 | goto out_kfree_skb; | |
1353 | if (skb->next) | |
1354 | goto gso; | |
1355 | } | |
f6a78bfc | 1356 | |
576a30eb | 1357 | return dev->hard_start_xmit(skb, dev); |
f6a78bfc HX |
1358 | } |
1359 | ||
576a30eb | 1360 | gso: |
f6a78bfc HX |
1361 | do { |
1362 | struct sk_buff *nskb = skb->next; | |
1363 | int rc; | |
1364 | ||
1365 | skb->next = nskb->next; | |
1366 | nskb->next = NULL; | |
1367 | rc = dev->hard_start_xmit(nskb, dev); | |
1368 | if (unlikely(rc)) { | |
f54d9e8d | 1369 | nskb->next = skb->next; |
f6a78bfc HX |
1370 | skb->next = nskb; |
1371 | return rc; | |
1372 | } | |
f54d9e8d MC |
1373 | if (unlikely(netif_queue_stopped(dev) && skb->next)) |
1374 | return NETDEV_TX_BUSY; | |
f6a78bfc HX |
1375 | } while (skb->next); |
1376 | ||
1377 | skb->destructor = DEV_GSO_CB(skb)->destructor; | |
1378 | ||
1379 | out_kfree_skb: | |
1380 | kfree_skb(skb); | |
1381 | return 0; | |
1382 | } | |
1383 | ||
1da177e4 LT |
1384 | #define HARD_TX_LOCK(dev, cpu) { \ |
1385 | if ((dev->features & NETIF_F_LLTX) == 0) { \ | |
932ff279 | 1386 | netif_tx_lock(dev); \ |
1da177e4 LT |
1387 | } \ |
1388 | } | |
1389 | ||
1390 | #define HARD_TX_UNLOCK(dev) { \ | |
1391 | if ((dev->features & NETIF_F_LLTX) == 0) { \ | |
932ff279 | 1392 | netif_tx_unlock(dev); \ |
1da177e4 LT |
1393 | } \ |
1394 | } | |
1395 | ||
1396 | /** | |
1397 | * dev_queue_xmit - transmit a buffer | |
1398 | * @skb: buffer to transmit | |
1399 | * | |
1400 | * Queue a buffer for transmission to a network device. The caller must | |
1401 | * have set the device and priority and built the buffer before calling | |
1402 | * this function. The function can be called from an interrupt. | |
1403 | * | |
1404 | * A negative errno code is returned on a failure. A success does not | |
1405 | * guarantee the frame will be transmitted as it may be dropped due | |
1406 | * to congestion or traffic shaping. | |
af191367 BG |
1407 | * |
1408 | * ----------------------------------------------------------------------------------- | |
1409 | * I notice this method can also return errors from the queue disciplines, | |
1410 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
1411 | * be positive. | |
1412 | * | |
1413 | * Regardless of the return value, the skb is consumed, so it is currently | |
1414 | * difficult to retry a send to this method. (You can bump the ref count | |
1415 | * before sending to hold a reference for retry if you are careful.) | |
1416 | * | |
1417 | * When calling this method, interrupts MUST be enabled. This is because | |
1418 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
1419 | * --BLG | |
1da177e4 LT |
1420 | */ |
1421 | ||
1422 | int dev_queue_xmit(struct sk_buff *skb) | |
1423 | { | |
1424 | struct net_device *dev = skb->dev; | |
1425 | struct Qdisc *q; | |
1426 | int rc = -ENOMEM; | |
1427 | ||
f6a78bfc HX |
1428 | /* GSO will handle the following emulations directly. */ |
1429 | if (netif_needs_gso(dev, skb)) | |
1430 | goto gso; | |
1431 | ||
1da177e4 LT |
1432 | if (skb_shinfo(skb)->frag_list && |
1433 | !(dev->features & NETIF_F_FRAGLIST) && | |
364c6bad | 1434 | __skb_linearize(skb)) |
1da177e4 LT |
1435 | goto out_kfree_skb; |
1436 | ||
1437 | /* Fragmented skb is linearized if device does not support SG, | |
1438 | * or if at least one of fragments is in highmem and device | |
1439 | * does not support DMA from it. | |
1440 | */ | |
1441 | if (skb_shinfo(skb)->nr_frags && | |
1442 | (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) && | |
364c6bad | 1443 | __skb_linearize(skb)) |
1da177e4 LT |
1444 | goto out_kfree_skb; |
1445 | ||
1446 | /* If packet is not checksummed and device does not support | |
1447 | * checksumming for this protocol, complete checksumming here. | |
1448 | */ | |
84fa7933 | 1449 | if (skb->ip_summed == CHECKSUM_PARTIAL && |
8648b305 | 1450 | (!(dev->features & NETIF_F_GEN_CSUM) && |
1da177e4 LT |
1451 | (!(dev->features & NETIF_F_IP_CSUM) || |
1452 | skb->protocol != htons(ETH_P_IP)))) | |
84fa7933 | 1453 | if (skb_checksum_help(skb)) |
1da177e4 LT |
1454 | goto out_kfree_skb; |
1455 | ||
f6a78bfc | 1456 | gso: |
2d7ceece ED |
1457 | spin_lock_prefetch(&dev->queue_lock); |
1458 | ||
1da177e4 LT |
1459 | /* Disable soft irqs for various locks below. Also |
1460 | * stops preemption for RCU. | |
1461 | */ | |
d4828d85 | 1462 | rcu_read_lock_bh(); |
1da177e4 LT |
1463 | |
1464 | /* Updates of qdisc are serialized by queue_lock. | |
1465 | * The struct Qdisc which is pointed to by qdisc is now a | |
1466 | * rcu structure - it may be accessed without acquiring | |
1467 | * a lock (but the structure may be stale.) The freeing of the | |
1468 | * qdisc will be deferred until it's known that there are no | |
1469 | * more references to it. | |
1470 | * | |
1471 | * If the qdisc has an enqueue function, we still need to | |
1472 | * hold the queue_lock before calling it, since queue_lock | |
1473 | * also serializes access to the device queue. | |
1474 | */ | |
1475 | ||
1476 | q = rcu_dereference(dev->qdisc); | |
1477 | #ifdef CONFIG_NET_CLS_ACT | |
1478 | skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS); | |
1479 | #endif | |
1480 | if (q->enqueue) { | |
1481 | /* Grab device queue */ | |
1482 | spin_lock(&dev->queue_lock); | |
85670cc1 PM |
1483 | q = dev->qdisc; |
1484 | if (q->enqueue) { | |
1485 | rc = q->enqueue(skb, q); | |
1486 | qdisc_run(dev); | |
1487 | spin_unlock(&dev->queue_lock); | |
1da177e4 | 1488 | |
85670cc1 PM |
1489 | rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc; |
1490 | goto out; | |
1491 | } | |
1da177e4 | 1492 | spin_unlock(&dev->queue_lock); |
1da177e4 LT |
1493 | } |
1494 | ||
1495 | /* The device has no queue. Common case for software devices: | |
1496 | loopback, all the sorts of tunnels... | |
1497 | ||
932ff279 HX |
1498 | Really, it is unlikely that netif_tx_lock protection is necessary |
1499 | here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
1da177e4 LT |
1500 | counters.) |
1501 | However, it is possible, that they rely on protection | |
1502 | made by us here. | |
1503 | ||
1504 | Check this and shot the lock. It is not prone from deadlocks. | |
1505 | Either shot noqueue qdisc, it is even simpler 8) | |
1506 | */ | |
1507 | if (dev->flags & IFF_UP) { | |
1508 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
1509 | ||
1510 | if (dev->xmit_lock_owner != cpu) { | |
1511 | ||
1512 | HARD_TX_LOCK(dev, cpu); | |
1513 | ||
1514 | if (!netif_queue_stopped(dev)) { | |
1da177e4 | 1515 | rc = 0; |
f6a78bfc | 1516 | if (!dev_hard_start_xmit(skb, dev)) { |
1da177e4 LT |
1517 | HARD_TX_UNLOCK(dev); |
1518 | goto out; | |
1519 | } | |
1520 | } | |
1521 | HARD_TX_UNLOCK(dev); | |
1522 | if (net_ratelimit()) | |
1523 | printk(KERN_CRIT "Virtual device %s asks to " | |
1524 | "queue packet!\n", dev->name); | |
1525 | } else { | |
1526 | /* Recursion is detected! It is possible, | |
1527 | * unfortunately */ | |
1528 | if (net_ratelimit()) | |
1529 | printk(KERN_CRIT "Dead loop on virtual device " | |
1530 | "%s, fix it urgently!\n", dev->name); | |
1531 | } | |
1532 | } | |
1533 | ||
1534 | rc = -ENETDOWN; | |
d4828d85 | 1535 | rcu_read_unlock_bh(); |
1da177e4 LT |
1536 | |
1537 | out_kfree_skb: | |
1538 | kfree_skb(skb); | |
1539 | return rc; | |
1540 | out: | |
d4828d85 | 1541 | rcu_read_unlock_bh(); |
1da177e4 LT |
1542 | return rc; |
1543 | } | |
1544 | ||
1545 | ||
1546 | /*======================================================================= | |
1547 | Receiver routines | |
1548 | =======================================================================*/ | |
1549 | ||
51b0bded SH |
1550 | int netdev_max_backlog = 1000; |
1551 | int netdev_budget = 300; | |
1da177e4 | 1552 | int weight_p = 64; /* old backlog weight */ |
1da177e4 LT |
1553 | |
1554 | DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, }; | |
1555 | ||
1556 | ||
1da177e4 LT |
1557 | /** |
1558 | * netif_rx - post buffer to the network code | |
1559 | * @skb: buffer to post | |
1560 | * | |
1561 | * This function receives a packet from a device driver and queues it for | |
1562 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
1563 | * may be dropped during processing for congestion control or by the | |
1564 | * protocol layers. | |
1565 | * | |
1566 | * return values: | |
1567 | * NET_RX_SUCCESS (no congestion) | |
1568 | * NET_RX_CN_LOW (low congestion) | |
1569 | * NET_RX_CN_MOD (moderate congestion) | |
1570 | * NET_RX_CN_HIGH (high congestion) | |
1571 | * NET_RX_DROP (packet was dropped) | |
1572 | * | |
1573 | */ | |
1574 | ||
1575 | int netif_rx(struct sk_buff *skb) | |
1576 | { | |
1da177e4 LT |
1577 | struct softnet_data *queue; |
1578 | unsigned long flags; | |
1579 | ||
1580 | /* if netpoll wants it, pretend we never saw it */ | |
1581 | if (netpoll_rx(skb)) | |
1582 | return NET_RX_DROP; | |
1583 | ||
a61bbcf2 PM |
1584 | if (!skb->tstamp.off_sec) |
1585 | net_timestamp(skb); | |
1da177e4 LT |
1586 | |
1587 | /* | |
1588 | * The code is rearranged so that the path is the most | |
1589 | * short when CPU is congested, but is still operating. | |
1590 | */ | |
1591 | local_irq_save(flags); | |
1da177e4 LT |
1592 | queue = &__get_cpu_var(softnet_data); |
1593 | ||
1594 | __get_cpu_var(netdev_rx_stat).total++; | |
1595 | if (queue->input_pkt_queue.qlen <= netdev_max_backlog) { | |
1596 | if (queue->input_pkt_queue.qlen) { | |
1da177e4 LT |
1597 | enqueue: |
1598 | dev_hold(skb->dev); | |
1599 | __skb_queue_tail(&queue->input_pkt_queue, skb); | |
1da177e4 | 1600 | local_irq_restore(flags); |
34008d8c | 1601 | return NET_RX_SUCCESS; |
1da177e4 LT |
1602 | } |
1603 | ||
1da177e4 LT |
1604 | netif_rx_schedule(&queue->backlog_dev); |
1605 | goto enqueue; | |
1606 | } | |
1607 | ||
1da177e4 LT |
1608 | __get_cpu_var(netdev_rx_stat).dropped++; |
1609 | local_irq_restore(flags); | |
1610 | ||
1611 | kfree_skb(skb); | |
1612 | return NET_RX_DROP; | |
1613 | } | |
1614 | ||
1615 | int netif_rx_ni(struct sk_buff *skb) | |
1616 | { | |
1617 | int err; | |
1618 | ||
1619 | preempt_disable(); | |
1620 | err = netif_rx(skb); | |
1621 | if (local_softirq_pending()) | |
1622 | do_softirq(); | |
1623 | preempt_enable(); | |
1624 | ||
1625 | return err; | |
1626 | } | |
1627 | ||
1628 | EXPORT_SYMBOL(netif_rx_ni); | |
1629 | ||
f2ccd8fa | 1630 | static inline struct net_device *skb_bond(struct sk_buff *skb) |
1da177e4 LT |
1631 | { |
1632 | struct net_device *dev = skb->dev; | |
1633 | ||
8f903c70 | 1634 | if (dev->master) { |
7ea49ed7 | 1635 | if (skb_bond_should_drop(skb)) { |
8f903c70 JV |
1636 | kfree_skb(skb); |
1637 | return NULL; | |
1638 | } | |
1da177e4 | 1639 | skb->dev = dev->master; |
8f903c70 | 1640 | } |
f2ccd8fa DM |
1641 | |
1642 | return dev; | |
1da177e4 LT |
1643 | } |
1644 | ||
1645 | static void net_tx_action(struct softirq_action *h) | |
1646 | { | |
1647 | struct softnet_data *sd = &__get_cpu_var(softnet_data); | |
1648 | ||
1649 | if (sd->completion_queue) { | |
1650 | struct sk_buff *clist; | |
1651 | ||
1652 | local_irq_disable(); | |
1653 | clist = sd->completion_queue; | |
1654 | sd->completion_queue = NULL; | |
1655 | local_irq_enable(); | |
1656 | ||
1657 | while (clist) { | |
1658 | struct sk_buff *skb = clist; | |
1659 | clist = clist->next; | |
1660 | ||
1661 | BUG_TRAP(!atomic_read(&skb->users)); | |
1662 | __kfree_skb(skb); | |
1663 | } | |
1664 | } | |
1665 | ||
1666 | if (sd->output_queue) { | |
1667 | struct net_device *head; | |
1668 | ||
1669 | local_irq_disable(); | |
1670 | head = sd->output_queue; | |
1671 | sd->output_queue = NULL; | |
1672 | local_irq_enable(); | |
1673 | ||
1674 | while (head) { | |
1675 | struct net_device *dev = head; | |
1676 | head = head->next_sched; | |
1677 | ||
1678 | smp_mb__before_clear_bit(); | |
1679 | clear_bit(__LINK_STATE_SCHED, &dev->state); | |
1680 | ||
1681 | if (spin_trylock(&dev->queue_lock)) { | |
1682 | qdisc_run(dev); | |
1683 | spin_unlock(&dev->queue_lock); | |
1684 | } else { | |
1685 | netif_schedule(dev); | |
1686 | } | |
1687 | } | |
1688 | } | |
1689 | } | |
1690 | ||
1691 | static __inline__ int deliver_skb(struct sk_buff *skb, | |
f2ccd8fa DM |
1692 | struct packet_type *pt_prev, |
1693 | struct net_device *orig_dev) | |
1da177e4 LT |
1694 | { |
1695 | atomic_inc(&skb->users); | |
f2ccd8fa | 1696 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
1da177e4 LT |
1697 | } |
1698 | ||
1699 | #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE) | |
1700 | int (*br_handle_frame_hook)(struct net_bridge_port *p, struct sk_buff **pskb); | |
1701 | struct net_bridge; | |
1702 | struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br, | |
1703 | unsigned char *addr); | |
1704 | void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent); | |
1705 | ||
1706 | static __inline__ int handle_bridge(struct sk_buff **pskb, | |
f2ccd8fa DM |
1707 | struct packet_type **pt_prev, int *ret, |
1708 | struct net_device *orig_dev) | |
1da177e4 LT |
1709 | { |
1710 | struct net_bridge_port *port; | |
1711 | ||
1712 | if ((*pskb)->pkt_type == PACKET_LOOPBACK || | |
1713 | (port = rcu_dereference((*pskb)->dev->br_port)) == NULL) | |
1714 | return 0; | |
1715 | ||
1716 | if (*pt_prev) { | |
f2ccd8fa | 1717 | *ret = deliver_skb(*pskb, *pt_prev, orig_dev); |
1da177e4 LT |
1718 | *pt_prev = NULL; |
1719 | } | |
1720 | ||
1721 | return br_handle_frame_hook(port, pskb); | |
1722 | } | |
1723 | #else | |
f2ccd8fa | 1724 | #define handle_bridge(skb, pt_prev, ret, orig_dev) (0) |
1da177e4 LT |
1725 | #endif |
1726 | ||
1727 | #ifdef CONFIG_NET_CLS_ACT | |
1728 | /* TODO: Maybe we should just force sch_ingress to be compiled in | |
1729 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions | |
1730 | * a compare and 2 stores extra right now if we dont have it on | |
1731 | * but have CONFIG_NET_CLS_ACT | |
1732 | * NOTE: This doesnt stop any functionality; if you dont have | |
1733 | * the ingress scheduler, you just cant add policies on ingress. | |
1734 | * | |
1735 | */ | |
1736 | static int ing_filter(struct sk_buff *skb) | |
1737 | { | |
1738 | struct Qdisc *q; | |
1739 | struct net_device *dev = skb->dev; | |
1740 | int result = TC_ACT_OK; | |
1741 | ||
1742 | if (dev->qdisc_ingress) { | |
1743 | __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd); | |
1744 | if (MAX_RED_LOOP < ttl++) { | |
5a8da02b | 1745 | printk(KERN_WARNING "Redir loop detected Dropping packet (%s->%s)\n", |
86e65da9 | 1746 | skb->input_dev->name, skb->dev->name); |
1da177e4 LT |
1747 | return TC_ACT_SHOT; |
1748 | } | |
1749 | ||
1750 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl); | |
1751 | ||
1752 | skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS); | |
86e65da9 | 1753 | |
1da177e4 LT |
1754 | spin_lock(&dev->ingress_lock); |
1755 | if ((q = dev->qdisc_ingress) != NULL) | |
1756 | result = q->enqueue(skb, q); | |
1757 | spin_unlock(&dev->ingress_lock); | |
1758 | ||
1759 | } | |
1760 | ||
1761 | return result; | |
1762 | } | |
1763 | #endif | |
1764 | ||
1765 | int netif_receive_skb(struct sk_buff *skb) | |
1766 | { | |
1767 | struct packet_type *ptype, *pt_prev; | |
f2ccd8fa | 1768 | struct net_device *orig_dev; |
1da177e4 LT |
1769 | int ret = NET_RX_DROP; |
1770 | unsigned short type; | |
1771 | ||
1772 | /* if we've gotten here through NAPI, check netpoll */ | |
1773 | if (skb->dev->poll && netpoll_rx(skb)) | |
1774 | return NET_RX_DROP; | |
1775 | ||
a61bbcf2 PM |
1776 | if (!skb->tstamp.off_sec) |
1777 | net_timestamp(skb); | |
1da177e4 | 1778 | |
86e65da9 DM |
1779 | if (!skb->input_dev) |
1780 | skb->input_dev = skb->dev; | |
1781 | ||
f2ccd8fa | 1782 | orig_dev = skb_bond(skb); |
1da177e4 | 1783 | |
8f903c70 JV |
1784 | if (!orig_dev) |
1785 | return NET_RX_DROP; | |
1786 | ||
1da177e4 LT |
1787 | __get_cpu_var(netdev_rx_stat).total++; |
1788 | ||
1789 | skb->h.raw = skb->nh.raw = skb->data; | |
1790 | skb->mac_len = skb->nh.raw - skb->mac.raw; | |
1791 | ||
1792 | pt_prev = NULL; | |
1793 | ||
1794 | rcu_read_lock(); | |
1795 | ||
1796 | #ifdef CONFIG_NET_CLS_ACT | |
1797 | if (skb->tc_verd & TC_NCLS) { | |
1798 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1799 | goto ncls; | |
1800 | } | |
1801 | #endif | |
1802 | ||
1803 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
1804 | if (!ptype->dev || ptype->dev == skb->dev) { | |
1805 | if (pt_prev) | |
f2ccd8fa | 1806 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
1807 | pt_prev = ptype; |
1808 | } | |
1809 | } | |
1810 | ||
1811 | #ifdef CONFIG_NET_CLS_ACT | |
1812 | if (pt_prev) { | |
f2ccd8fa | 1813 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
1814 | pt_prev = NULL; /* noone else should process this after*/ |
1815 | } else { | |
1816 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
1817 | } | |
1818 | ||
1819 | ret = ing_filter(skb); | |
1820 | ||
1821 | if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) { | |
1822 | kfree_skb(skb); | |
1823 | goto out; | |
1824 | } | |
1825 | ||
1826 | skb->tc_verd = 0; | |
1827 | ncls: | |
1828 | #endif | |
1829 | ||
1830 | handle_diverter(skb); | |
1831 | ||
f2ccd8fa | 1832 | if (handle_bridge(&skb, &pt_prev, &ret, orig_dev)) |
1da177e4 LT |
1833 | goto out; |
1834 | ||
1835 | type = skb->protocol; | |
1836 | list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) { | |
1837 | if (ptype->type == type && | |
1838 | (!ptype->dev || ptype->dev == skb->dev)) { | |
1839 | if (pt_prev) | |
f2ccd8fa | 1840 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
1841 | pt_prev = ptype; |
1842 | } | |
1843 | } | |
1844 | ||
1845 | if (pt_prev) { | |
f2ccd8fa | 1846 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
1da177e4 LT |
1847 | } else { |
1848 | kfree_skb(skb); | |
1849 | /* Jamal, now you will not able to escape explaining | |
1850 | * me how you were going to use this. :-) | |
1851 | */ | |
1852 | ret = NET_RX_DROP; | |
1853 | } | |
1854 | ||
1855 | out: | |
1856 | rcu_read_unlock(); | |
1857 | return ret; | |
1858 | } | |
1859 | ||
1860 | static int process_backlog(struct net_device *backlog_dev, int *budget) | |
1861 | { | |
1862 | int work = 0; | |
1863 | int quota = min(backlog_dev->quota, *budget); | |
1864 | struct softnet_data *queue = &__get_cpu_var(softnet_data); | |
1865 | unsigned long start_time = jiffies; | |
1866 | ||
e3876605 | 1867 | backlog_dev->weight = weight_p; |
1da177e4 LT |
1868 | for (;;) { |
1869 | struct sk_buff *skb; | |
1870 | struct net_device *dev; | |
1871 | ||
1872 | local_irq_disable(); | |
1873 | skb = __skb_dequeue(&queue->input_pkt_queue); | |
1874 | if (!skb) | |
1875 | goto job_done; | |
1876 | local_irq_enable(); | |
1877 | ||
1878 | dev = skb->dev; | |
1879 | ||
1880 | netif_receive_skb(skb); | |
1881 | ||
1882 | dev_put(dev); | |
1883 | ||
1884 | work++; | |
1885 | ||
1886 | if (work >= quota || jiffies - start_time > 1) | |
1887 | break; | |
1888 | ||
1889 | } | |
1890 | ||
1891 | backlog_dev->quota -= work; | |
1892 | *budget -= work; | |
1893 | return -1; | |
1894 | ||
1895 | job_done: | |
1896 | backlog_dev->quota -= work; | |
1897 | *budget -= work; | |
1898 | ||
1899 | list_del(&backlog_dev->poll_list); | |
1900 | smp_mb__before_clear_bit(); | |
1901 | netif_poll_enable(backlog_dev); | |
1902 | ||
1da177e4 LT |
1903 | local_irq_enable(); |
1904 | return 0; | |
1905 | } | |
1906 | ||
1907 | static void net_rx_action(struct softirq_action *h) | |
1908 | { | |
1909 | struct softnet_data *queue = &__get_cpu_var(softnet_data); | |
1910 | unsigned long start_time = jiffies; | |
51b0bded | 1911 | int budget = netdev_budget; |
53fb95d3 MM |
1912 | void *have; |
1913 | ||
1da177e4 LT |
1914 | local_irq_disable(); |
1915 | ||
1916 | while (!list_empty(&queue->poll_list)) { | |
1917 | struct net_device *dev; | |
1918 | ||
1919 | if (budget <= 0 || jiffies - start_time > 1) | |
1920 | goto softnet_break; | |
1921 | ||
1922 | local_irq_enable(); | |
1923 | ||
1924 | dev = list_entry(queue->poll_list.next, | |
1925 | struct net_device, poll_list); | |
53fb95d3 | 1926 | have = netpoll_poll_lock(dev); |
1da177e4 LT |
1927 | |
1928 | if (dev->quota <= 0 || dev->poll(dev, &budget)) { | |
53fb95d3 | 1929 | netpoll_poll_unlock(have); |
1da177e4 | 1930 | local_irq_disable(); |
8aca8a27 | 1931 | list_move_tail(&dev->poll_list, &queue->poll_list); |
1da177e4 LT |
1932 | if (dev->quota < 0) |
1933 | dev->quota += dev->weight; | |
1934 | else | |
1935 | dev->quota = dev->weight; | |
1936 | } else { | |
53fb95d3 | 1937 | netpoll_poll_unlock(have); |
1da177e4 LT |
1938 | dev_put(dev); |
1939 | local_irq_disable(); | |
1940 | } | |
1941 | } | |
1942 | out: | |
db217334 CL |
1943 | #ifdef CONFIG_NET_DMA |
1944 | /* | |
1945 | * There may not be any more sk_buffs coming right now, so push | |
1946 | * any pending DMA copies to hardware | |
1947 | */ | |
1948 | if (net_dma_client) { | |
1949 | struct dma_chan *chan; | |
1950 | rcu_read_lock(); | |
1951 | list_for_each_entry_rcu(chan, &net_dma_client->channels, client_node) | |
1952 | dma_async_memcpy_issue_pending(chan); | |
1953 | rcu_read_unlock(); | |
1954 | } | |
1955 | #endif | |
1da177e4 LT |
1956 | local_irq_enable(); |
1957 | return; | |
1958 | ||
1959 | softnet_break: | |
1960 | __get_cpu_var(netdev_rx_stat).time_squeeze++; | |
1961 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
1962 | goto out; | |
1963 | } | |
1964 | ||
1965 | static gifconf_func_t * gifconf_list [NPROTO]; | |
1966 | ||
1967 | /** | |
1968 | * register_gifconf - register a SIOCGIF handler | |
1969 | * @family: Address family | |
1970 | * @gifconf: Function handler | |
1971 | * | |
1972 | * Register protocol dependent address dumping routines. The handler | |
1973 | * that is passed must not be freed or reused until it has been replaced | |
1974 | * by another handler. | |
1975 | */ | |
1976 | int register_gifconf(unsigned int family, gifconf_func_t * gifconf) | |
1977 | { | |
1978 | if (family >= NPROTO) | |
1979 | return -EINVAL; | |
1980 | gifconf_list[family] = gifconf; | |
1981 | return 0; | |
1982 | } | |
1983 | ||
1984 | ||
1985 | /* | |
1986 | * Map an interface index to its name (SIOCGIFNAME) | |
1987 | */ | |
1988 | ||
1989 | /* | |
1990 | * We need this ioctl for efficient implementation of the | |
1991 | * if_indextoname() function required by the IPv6 API. Without | |
1992 | * it, we would have to search all the interfaces to find a | |
1993 | * match. --pb | |
1994 | */ | |
1995 | ||
1996 | static int dev_ifname(struct ifreq __user *arg) | |
1997 | { | |
1998 | struct net_device *dev; | |
1999 | struct ifreq ifr; | |
2000 | ||
2001 | /* | |
2002 | * Fetch the caller's info block. | |
2003 | */ | |
2004 | ||
2005 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
2006 | return -EFAULT; | |
2007 | ||
2008 | read_lock(&dev_base_lock); | |
2009 | dev = __dev_get_by_index(ifr.ifr_ifindex); | |
2010 | if (!dev) { | |
2011 | read_unlock(&dev_base_lock); | |
2012 | return -ENODEV; | |
2013 | } | |
2014 | ||
2015 | strcpy(ifr.ifr_name, dev->name); | |
2016 | read_unlock(&dev_base_lock); | |
2017 | ||
2018 | if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) | |
2019 | return -EFAULT; | |
2020 | return 0; | |
2021 | } | |
2022 | ||
2023 | /* | |
2024 | * Perform a SIOCGIFCONF call. This structure will change | |
2025 | * size eventually, and there is nothing I can do about it. | |
2026 | * Thus we will need a 'compatibility mode'. | |
2027 | */ | |
2028 | ||
2029 | static int dev_ifconf(char __user *arg) | |
2030 | { | |
2031 | struct ifconf ifc; | |
2032 | struct net_device *dev; | |
2033 | char __user *pos; | |
2034 | int len; | |
2035 | int total; | |
2036 | int i; | |
2037 | ||
2038 | /* | |
2039 | * Fetch the caller's info block. | |
2040 | */ | |
2041 | ||
2042 | if (copy_from_user(&ifc, arg, sizeof(struct ifconf))) | |
2043 | return -EFAULT; | |
2044 | ||
2045 | pos = ifc.ifc_buf; | |
2046 | len = ifc.ifc_len; | |
2047 | ||
2048 | /* | |
2049 | * Loop over the interfaces, and write an info block for each. | |
2050 | */ | |
2051 | ||
2052 | total = 0; | |
2053 | for (dev = dev_base; dev; dev = dev->next) { | |
2054 | for (i = 0; i < NPROTO; i++) { | |
2055 | if (gifconf_list[i]) { | |
2056 | int done; | |
2057 | if (!pos) | |
2058 | done = gifconf_list[i](dev, NULL, 0); | |
2059 | else | |
2060 | done = gifconf_list[i](dev, pos + total, | |
2061 | len - total); | |
2062 | if (done < 0) | |
2063 | return -EFAULT; | |
2064 | total += done; | |
2065 | } | |
2066 | } | |
2067 | } | |
2068 | ||
2069 | /* | |
2070 | * All done. Write the updated control block back to the caller. | |
2071 | */ | |
2072 | ifc.ifc_len = total; | |
2073 | ||
2074 | /* | |
2075 | * Both BSD and Solaris return 0 here, so we do too. | |
2076 | */ | |
2077 | return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0; | |
2078 | } | |
2079 | ||
2080 | #ifdef CONFIG_PROC_FS | |
2081 | /* | |
2082 | * This is invoked by the /proc filesystem handler to display a device | |
2083 | * in detail. | |
2084 | */ | |
2085 | static __inline__ struct net_device *dev_get_idx(loff_t pos) | |
2086 | { | |
2087 | struct net_device *dev; | |
2088 | loff_t i; | |
2089 | ||
2090 | for (i = 0, dev = dev_base; dev && i < pos; ++i, dev = dev->next); | |
2091 | ||
2092 | return i == pos ? dev : NULL; | |
2093 | } | |
2094 | ||
2095 | void *dev_seq_start(struct seq_file *seq, loff_t *pos) | |
2096 | { | |
2097 | read_lock(&dev_base_lock); | |
2098 | return *pos ? dev_get_idx(*pos - 1) : SEQ_START_TOKEN; | |
2099 | } | |
2100 | ||
2101 | void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2102 | { | |
2103 | ++*pos; | |
2104 | return v == SEQ_START_TOKEN ? dev_base : ((struct net_device *)v)->next; | |
2105 | } | |
2106 | ||
2107 | void dev_seq_stop(struct seq_file *seq, void *v) | |
2108 | { | |
2109 | read_unlock(&dev_base_lock); | |
2110 | } | |
2111 | ||
2112 | static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) | |
2113 | { | |
2114 | if (dev->get_stats) { | |
2115 | struct net_device_stats *stats = dev->get_stats(dev); | |
2116 | ||
2117 | seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu " | |
2118 | "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n", | |
2119 | dev->name, stats->rx_bytes, stats->rx_packets, | |
2120 | stats->rx_errors, | |
2121 | stats->rx_dropped + stats->rx_missed_errors, | |
2122 | stats->rx_fifo_errors, | |
2123 | stats->rx_length_errors + stats->rx_over_errors + | |
2124 | stats->rx_crc_errors + stats->rx_frame_errors, | |
2125 | stats->rx_compressed, stats->multicast, | |
2126 | stats->tx_bytes, stats->tx_packets, | |
2127 | stats->tx_errors, stats->tx_dropped, | |
2128 | stats->tx_fifo_errors, stats->collisions, | |
2129 | stats->tx_carrier_errors + | |
2130 | stats->tx_aborted_errors + | |
2131 | stats->tx_window_errors + | |
2132 | stats->tx_heartbeat_errors, | |
2133 | stats->tx_compressed); | |
2134 | } else | |
2135 | seq_printf(seq, "%6s: No statistics available.\n", dev->name); | |
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) | |
2160 | if (cpu_online(*pos)) { | |
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 | ||
2194 | static struct seq_operations dev_seq_ops = { | |
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 | ||
2206 | static struct file_operations dev_seq_fops = { | |
2207 | .owner = THIS_MODULE, | |
2208 | .open = dev_seq_open, | |
2209 | .read = seq_read, | |
2210 | .llseek = seq_lseek, | |
2211 | .release = seq_release, | |
2212 | }; | |
2213 | ||
2214 | static struct seq_operations softnet_seq_ops = { | |
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 | ||
2226 | static struct file_operations softnet_seq_fops = { | |
2227 | .owner = THIS_MODULE, | |
2228 | .open = softnet_seq_open, | |
2229 | .read = seq_read, | |
2230 | .llseek = seq_lseek, | |
2231 | .release = seq_release, | |
2232 | }; | |
2233 | ||
d86b5e0e | 2234 | #ifdef CONFIG_WIRELESS_EXT |
1da177e4 LT |
2235 | extern int wireless_proc_init(void); |
2236 | #else | |
2237 | #define wireless_proc_init() 0 | |
2238 | #endif | |
2239 | ||
2240 | static int __init dev_proc_init(void) | |
2241 | { | |
2242 | int rc = -ENOMEM; | |
2243 | ||
2244 | if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops)) | |
2245 | goto out; | |
2246 | if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops)) | |
2247 | goto out_dev; | |
2248 | if (wireless_proc_init()) | |
2249 | goto out_softnet; | |
2250 | rc = 0; | |
2251 | out: | |
2252 | return rc; | |
2253 | out_softnet: | |
2254 | proc_net_remove("softnet_stat"); | |
2255 | out_dev: | |
2256 | proc_net_remove("dev"); | |
2257 | goto out; | |
2258 | } | |
2259 | #else | |
2260 | #define dev_proc_init() 0 | |
2261 | #endif /* CONFIG_PROC_FS */ | |
2262 | ||
2263 | ||
2264 | /** | |
2265 | * netdev_set_master - set up master/slave pair | |
2266 | * @slave: slave device | |
2267 | * @master: new master device | |
2268 | * | |
2269 | * Changes the master device of the slave. Pass %NULL to break the | |
2270 | * bonding. The caller must hold the RTNL semaphore. On a failure | |
2271 | * a negative errno code is returned. On success the reference counts | |
2272 | * are adjusted, %RTM_NEWLINK is sent to the routing socket and the | |
2273 | * function returns zero. | |
2274 | */ | |
2275 | int netdev_set_master(struct net_device *slave, struct net_device *master) | |
2276 | { | |
2277 | struct net_device *old = slave->master; | |
2278 | ||
2279 | ASSERT_RTNL(); | |
2280 | ||
2281 | if (master) { | |
2282 | if (old) | |
2283 | return -EBUSY; | |
2284 | dev_hold(master); | |
2285 | } | |
2286 | ||
2287 | slave->master = master; | |
2288 | ||
2289 | synchronize_net(); | |
2290 | ||
2291 | if (old) | |
2292 | dev_put(old); | |
2293 | ||
2294 | if (master) | |
2295 | slave->flags |= IFF_SLAVE; | |
2296 | else | |
2297 | slave->flags &= ~IFF_SLAVE; | |
2298 | ||
2299 | rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE); | |
2300 | return 0; | |
2301 | } | |
2302 | ||
2303 | /** | |
2304 | * dev_set_promiscuity - update promiscuity count on a device | |
2305 | * @dev: device | |
2306 | * @inc: modifier | |
2307 | * | |
3041a069 | 2308 | * Add or remove promiscuity from a device. While the count in the device |
1da177e4 LT |
2309 | * remains above zero the interface remains promiscuous. Once it hits zero |
2310 | * the device reverts back to normal filtering operation. A negative inc | |
2311 | * value is used to drop promiscuity on the device. | |
2312 | */ | |
2313 | void dev_set_promiscuity(struct net_device *dev, int inc) | |
2314 | { | |
2315 | unsigned short old_flags = dev->flags; | |
2316 | ||
1da177e4 LT |
2317 | if ((dev->promiscuity += inc) == 0) |
2318 | dev->flags &= ~IFF_PROMISC; | |
52609c0b DC |
2319 | else |
2320 | dev->flags |= IFF_PROMISC; | |
2321 | if (dev->flags != old_flags) { | |
1da177e4 LT |
2322 | dev_mc_upload(dev); |
2323 | printk(KERN_INFO "device %s %s promiscuous mode\n", | |
2324 | dev->name, (dev->flags & IFF_PROMISC) ? "entered" : | |
2325 | "left"); | |
5bdb9886 SG |
2326 | audit_log(current->audit_context, GFP_ATOMIC, |
2327 | AUDIT_ANOM_PROMISCUOUS, | |
2328 | "dev=%s prom=%d old_prom=%d auid=%u", | |
2329 | dev->name, (dev->flags & IFF_PROMISC), | |
2330 | (old_flags & IFF_PROMISC), | |
2331 | audit_get_loginuid(current->audit_context)); | |
1da177e4 LT |
2332 | } |
2333 | } | |
2334 | ||
2335 | /** | |
2336 | * dev_set_allmulti - update allmulti count on a device | |
2337 | * @dev: device | |
2338 | * @inc: modifier | |
2339 | * | |
2340 | * Add or remove reception of all multicast frames to a device. While the | |
2341 | * count in the device remains above zero the interface remains listening | |
2342 | * to all interfaces. Once it hits zero the device reverts back to normal | |
2343 | * filtering operation. A negative @inc value is used to drop the counter | |
2344 | * when releasing a resource needing all multicasts. | |
2345 | */ | |
2346 | ||
2347 | void dev_set_allmulti(struct net_device *dev, int inc) | |
2348 | { | |
2349 | unsigned short old_flags = dev->flags; | |
2350 | ||
2351 | dev->flags |= IFF_ALLMULTI; | |
2352 | if ((dev->allmulti += inc) == 0) | |
2353 | dev->flags &= ~IFF_ALLMULTI; | |
2354 | if (dev->flags ^ old_flags) | |
2355 | dev_mc_upload(dev); | |
2356 | } | |
2357 | ||
2358 | unsigned dev_get_flags(const struct net_device *dev) | |
2359 | { | |
2360 | unsigned flags; | |
2361 | ||
2362 | flags = (dev->flags & ~(IFF_PROMISC | | |
2363 | IFF_ALLMULTI | | |
b00055aa SR |
2364 | IFF_RUNNING | |
2365 | IFF_LOWER_UP | | |
2366 | IFF_DORMANT)) | | |
1da177e4 LT |
2367 | (dev->gflags & (IFF_PROMISC | |
2368 | IFF_ALLMULTI)); | |
2369 | ||
b00055aa SR |
2370 | if (netif_running(dev)) { |
2371 | if (netif_oper_up(dev)) | |
2372 | flags |= IFF_RUNNING; | |
2373 | if (netif_carrier_ok(dev)) | |
2374 | flags |= IFF_LOWER_UP; | |
2375 | if (netif_dormant(dev)) | |
2376 | flags |= IFF_DORMANT; | |
2377 | } | |
1da177e4 LT |
2378 | |
2379 | return flags; | |
2380 | } | |
2381 | ||
2382 | int dev_change_flags(struct net_device *dev, unsigned flags) | |
2383 | { | |
2384 | int ret; | |
2385 | int old_flags = dev->flags; | |
2386 | ||
2387 | /* | |
2388 | * Set the flags on our device. | |
2389 | */ | |
2390 | ||
2391 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
2392 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
2393 | IFF_AUTOMEDIA)) | | |
2394 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
2395 | IFF_ALLMULTI)); | |
2396 | ||
2397 | /* | |
2398 | * Load in the correct multicast list now the flags have changed. | |
2399 | */ | |
2400 | ||
2401 | dev_mc_upload(dev); | |
2402 | ||
2403 | /* | |
2404 | * Have we downed the interface. We handle IFF_UP ourselves | |
2405 | * according to user attempts to set it, rather than blindly | |
2406 | * setting it. | |
2407 | */ | |
2408 | ||
2409 | ret = 0; | |
2410 | if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */ | |
2411 | ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev); | |
2412 | ||
2413 | if (!ret) | |
2414 | dev_mc_upload(dev); | |
2415 | } | |
2416 | ||
2417 | if (dev->flags & IFF_UP && | |
2418 | ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI | | |
2419 | IFF_VOLATILE))) | |
f07d5b94 | 2420 | raw_notifier_call_chain(&netdev_chain, |
e041c683 | 2421 | NETDEV_CHANGE, dev); |
1da177e4 LT |
2422 | |
2423 | if ((flags ^ dev->gflags) & IFF_PROMISC) { | |
2424 | int inc = (flags & IFF_PROMISC) ? +1 : -1; | |
2425 | dev->gflags ^= IFF_PROMISC; | |
2426 | dev_set_promiscuity(dev, inc); | |
2427 | } | |
2428 | ||
2429 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
2430 | is important. Some (broken) drivers set IFF_PROMISC, when | |
2431 | IFF_ALLMULTI is requested not asking us and not reporting. | |
2432 | */ | |
2433 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
2434 | int inc = (flags & IFF_ALLMULTI) ? +1 : -1; | |
2435 | dev->gflags ^= IFF_ALLMULTI; | |
2436 | dev_set_allmulti(dev, inc); | |
2437 | } | |
2438 | ||
2439 | if (old_flags ^ dev->flags) | |
2440 | rtmsg_ifinfo(RTM_NEWLINK, dev, old_flags ^ dev->flags); | |
2441 | ||
2442 | return ret; | |
2443 | } | |
2444 | ||
2445 | int dev_set_mtu(struct net_device *dev, int new_mtu) | |
2446 | { | |
2447 | int err; | |
2448 | ||
2449 | if (new_mtu == dev->mtu) | |
2450 | return 0; | |
2451 | ||
2452 | /* MTU must be positive. */ | |
2453 | if (new_mtu < 0) | |
2454 | return -EINVAL; | |
2455 | ||
2456 | if (!netif_device_present(dev)) | |
2457 | return -ENODEV; | |
2458 | ||
2459 | err = 0; | |
2460 | if (dev->change_mtu) | |
2461 | err = dev->change_mtu(dev, new_mtu); | |
2462 | else | |
2463 | dev->mtu = new_mtu; | |
2464 | if (!err && dev->flags & IFF_UP) | |
f07d5b94 | 2465 | raw_notifier_call_chain(&netdev_chain, |
e041c683 | 2466 | NETDEV_CHANGEMTU, dev); |
1da177e4 LT |
2467 | return err; |
2468 | } | |
2469 | ||
2470 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) | |
2471 | { | |
2472 | int err; | |
2473 | ||
2474 | if (!dev->set_mac_address) | |
2475 | return -EOPNOTSUPP; | |
2476 | if (sa->sa_family != dev->type) | |
2477 | return -EINVAL; | |
2478 | if (!netif_device_present(dev)) | |
2479 | return -ENODEV; | |
2480 | err = dev->set_mac_address(dev, sa); | |
2481 | if (!err) | |
f07d5b94 | 2482 | raw_notifier_call_chain(&netdev_chain, |
e041c683 | 2483 | NETDEV_CHANGEADDR, dev); |
1da177e4 LT |
2484 | return err; |
2485 | } | |
2486 | ||
2487 | /* | |
2488 | * Perform the SIOCxIFxxx calls. | |
2489 | */ | |
2490 | static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd) | |
2491 | { | |
2492 | int err; | |
2493 | struct net_device *dev = __dev_get_by_name(ifr->ifr_name); | |
2494 | ||
2495 | if (!dev) | |
2496 | return -ENODEV; | |
2497 | ||
2498 | switch (cmd) { | |
2499 | case SIOCGIFFLAGS: /* Get interface flags */ | |
2500 | ifr->ifr_flags = dev_get_flags(dev); | |
2501 | return 0; | |
2502 | ||
2503 | case SIOCSIFFLAGS: /* Set interface flags */ | |
2504 | return dev_change_flags(dev, ifr->ifr_flags); | |
2505 | ||
2506 | case SIOCGIFMETRIC: /* Get the metric on the interface | |
2507 | (currently unused) */ | |
2508 | ifr->ifr_metric = 0; | |
2509 | return 0; | |
2510 | ||
2511 | case SIOCSIFMETRIC: /* Set the metric on the interface | |
2512 | (currently unused) */ | |
2513 | return -EOPNOTSUPP; | |
2514 | ||
2515 | case SIOCGIFMTU: /* Get the MTU of a device */ | |
2516 | ifr->ifr_mtu = dev->mtu; | |
2517 | return 0; | |
2518 | ||
2519 | case SIOCSIFMTU: /* Set the MTU of a device */ | |
2520 | return dev_set_mtu(dev, ifr->ifr_mtu); | |
2521 | ||
2522 | case SIOCGIFHWADDR: | |
2523 | if (!dev->addr_len) | |
2524 | memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data); | |
2525 | else | |
2526 | memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr, | |
2527 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); | |
2528 | ifr->ifr_hwaddr.sa_family = dev->type; | |
2529 | return 0; | |
2530 | ||
2531 | case SIOCSIFHWADDR: | |
2532 | return dev_set_mac_address(dev, &ifr->ifr_hwaddr); | |
2533 | ||
2534 | case SIOCSIFHWBROADCAST: | |
2535 | if (ifr->ifr_hwaddr.sa_family != dev->type) | |
2536 | return -EINVAL; | |
2537 | memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, | |
2538 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); | |
f07d5b94 | 2539 | raw_notifier_call_chain(&netdev_chain, |
1da177e4 LT |
2540 | NETDEV_CHANGEADDR, dev); |
2541 | return 0; | |
2542 | ||
2543 | case SIOCGIFMAP: | |
2544 | ifr->ifr_map.mem_start = dev->mem_start; | |
2545 | ifr->ifr_map.mem_end = dev->mem_end; | |
2546 | ifr->ifr_map.base_addr = dev->base_addr; | |
2547 | ifr->ifr_map.irq = dev->irq; | |
2548 | ifr->ifr_map.dma = dev->dma; | |
2549 | ifr->ifr_map.port = dev->if_port; | |
2550 | return 0; | |
2551 | ||
2552 | case SIOCSIFMAP: | |
2553 | if (dev->set_config) { | |
2554 | if (!netif_device_present(dev)) | |
2555 | return -ENODEV; | |
2556 | return dev->set_config(dev, &ifr->ifr_map); | |
2557 | } | |
2558 | return -EOPNOTSUPP; | |
2559 | ||
2560 | case SIOCADDMULTI: | |
2561 | if (!dev->set_multicast_list || | |
2562 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) | |
2563 | return -EINVAL; | |
2564 | if (!netif_device_present(dev)) | |
2565 | return -ENODEV; | |
2566 | return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data, | |
2567 | dev->addr_len, 1); | |
2568 | ||
2569 | case SIOCDELMULTI: | |
2570 | if (!dev->set_multicast_list || | |
2571 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) | |
2572 | return -EINVAL; | |
2573 | if (!netif_device_present(dev)) | |
2574 | return -ENODEV; | |
2575 | return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data, | |
2576 | dev->addr_len, 1); | |
2577 | ||
2578 | case SIOCGIFINDEX: | |
2579 | ifr->ifr_ifindex = dev->ifindex; | |
2580 | return 0; | |
2581 | ||
2582 | case SIOCGIFTXQLEN: | |
2583 | ifr->ifr_qlen = dev->tx_queue_len; | |
2584 | return 0; | |
2585 | ||
2586 | case SIOCSIFTXQLEN: | |
2587 | if (ifr->ifr_qlen < 0) | |
2588 | return -EINVAL; | |
2589 | dev->tx_queue_len = ifr->ifr_qlen; | |
2590 | return 0; | |
2591 | ||
2592 | case SIOCSIFNAME: | |
2593 | ifr->ifr_newname[IFNAMSIZ-1] = '\0'; | |
2594 | return dev_change_name(dev, ifr->ifr_newname); | |
2595 | ||
2596 | /* | |
2597 | * Unknown or private ioctl | |
2598 | */ | |
2599 | ||
2600 | default: | |
2601 | if ((cmd >= SIOCDEVPRIVATE && | |
2602 | cmd <= SIOCDEVPRIVATE + 15) || | |
2603 | cmd == SIOCBONDENSLAVE || | |
2604 | cmd == SIOCBONDRELEASE || | |
2605 | cmd == SIOCBONDSETHWADDR || | |
2606 | cmd == SIOCBONDSLAVEINFOQUERY || | |
2607 | cmd == SIOCBONDINFOQUERY || | |
2608 | cmd == SIOCBONDCHANGEACTIVE || | |
2609 | cmd == SIOCGMIIPHY || | |
2610 | cmd == SIOCGMIIREG || | |
2611 | cmd == SIOCSMIIREG || | |
2612 | cmd == SIOCBRADDIF || | |
2613 | cmd == SIOCBRDELIF || | |
2614 | cmd == SIOCWANDEV) { | |
2615 | err = -EOPNOTSUPP; | |
2616 | if (dev->do_ioctl) { | |
2617 | if (netif_device_present(dev)) | |
2618 | err = dev->do_ioctl(dev, ifr, | |
2619 | cmd); | |
2620 | else | |
2621 | err = -ENODEV; | |
2622 | } | |
2623 | } else | |
2624 | err = -EINVAL; | |
2625 | ||
2626 | } | |
2627 | return err; | |
2628 | } | |
2629 | ||
2630 | /* | |
2631 | * This function handles all "interface"-type I/O control requests. The actual | |
2632 | * 'doing' part of this is dev_ifsioc above. | |
2633 | */ | |
2634 | ||
2635 | /** | |
2636 | * dev_ioctl - network device ioctl | |
2637 | * @cmd: command to issue | |
2638 | * @arg: pointer to a struct ifreq in user space | |
2639 | * | |
2640 | * Issue ioctl functions to devices. This is normally called by the | |
2641 | * user space syscall interfaces but can sometimes be useful for | |
2642 | * other purposes. The return value is the return from the syscall if | |
2643 | * positive or a negative errno code on error. | |
2644 | */ | |
2645 | ||
2646 | int dev_ioctl(unsigned int cmd, void __user *arg) | |
2647 | { | |
2648 | struct ifreq ifr; | |
2649 | int ret; | |
2650 | char *colon; | |
2651 | ||
2652 | /* One special case: SIOCGIFCONF takes ifconf argument | |
2653 | and requires shared lock, because it sleeps writing | |
2654 | to user space. | |
2655 | */ | |
2656 | ||
2657 | if (cmd == SIOCGIFCONF) { | |
6756ae4b | 2658 | rtnl_lock(); |
1da177e4 | 2659 | ret = dev_ifconf((char __user *) arg); |
6756ae4b | 2660 | rtnl_unlock(); |
1da177e4 LT |
2661 | return ret; |
2662 | } | |
2663 | if (cmd == SIOCGIFNAME) | |
2664 | return dev_ifname((struct ifreq __user *)arg); | |
2665 | ||
2666 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
2667 | return -EFAULT; | |
2668 | ||
2669 | ifr.ifr_name[IFNAMSIZ-1] = 0; | |
2670 | ||
2671 | colon = strchr(ifr.ifr_name, ':'); | |
2672 | if (colon) | |
2673 | *colon = 0; | |
2674 | ||
2675 | /* | |
2676 | * See which interface the caller is talking about. | |
2677 | */ | |
2678 | ||
2679 | switch (cmd) { | |
2680 | /* | |
2681 | * These ioctl calls: | |
2682 | * - can be done by all. | |
2683 | * - atomic and do not require locking. | |
2684 | * - return a value | |
2685 | */ | |
2686 | case SIOCGIFFLAGS: | |
2687 | case SIOCGIFMETRIC: | |
2688 | case SIOCGIFMTU: | |
2689 | case SIOCGIFHWADDR: | |
2690 | case SIOCGIFSLAVE: | |
2691 | case SIOCGIFMAP: | |
2692 | case SIOCGIFINDEX: | |
2693 | case SIOCGIFTXQLEN: | |
2694 | dev_load(ifr.ifr_name); | |
2695 | read_lock(&dev_base_lock); | |
2696 | ret = dev_ifsioc(&ifr, cmd); | |
2697 | read_unlock(&dev_base_lock); | |
2698 | if (!ret) { | |
2699 | if (colon) | |
2700 | *colon = ':'; | |
2701 | if (copy_to_user(arg, &ifr, | |
2702 | sizeof(struct ifreq))) | |
2703 | ret = -EFAULT; | |
2704 | } | |
2705 | return ret; | |
2706 | ||
2707 | case SIOCETHTOOL: | |
2708 | dev_load(ifr.ifr_name); | |
2709 | rtnl_lock(); | |
2710 | ret = dev_ethtool(&ifr); | |
2711 | rtnl_unlock(); | |
2712 | if (!ret) { | |
2713 | if (colon) | |
2714 | *colon = ':'; | |
2715 | if (copy_to_user(arg, &ifr, | |
2716 | sizeof(struct ifreq))) | |
2717 | ret = -EFAULT; | |
2718 | } | |
2719 | return ret; | |
2720 | ||
2721 | /* | |
2722 | * These ioctl calls: | |
2723 | * - require superuser power. | |
2724 | * - require strict serialization. | |
2725 | * - return a value | |
2726 | */ | |
2727 | case SIOCGMIIPHY: | |
2728 | case SIOCGMIIREG: | |
2729 | case SIOCSIFNAME: | |
2730 | if (!capable(CAP_NET_ADMIN)) | |
2731 | return -EPERM; | |
2732 | dev_load(ifr.ifr_name); | |
2733 | rtnl_lock(); | |
2734 | ret = dev_ifsioc(&ifr, cmd); | |
2735 | rtnl_unlock(); | |
2736 | if (!ret) { | |
2737 | if (colon) | |
2738 | *colon = ':'; | |
2739 | if (copy_to_user(arg, &ifr, | |
2740 | sizeof(struct ifreq))) | |
2741 | ret = -EFAULT; | |
2742 | } | |
2743 | return ret; | |
2744 | ||
2745 | /* | |
2746 | * These ioctl calls: | |
2747 | * - require superuser power. | |
2748 | * - require strict serialization. | |
2749 | * - do not return a value | |
2750 | */ | |
2751 | case SIOCSIFFLAGS: | |
2752 | case SIOCSIFMETRIC: | |
2753 | case SIOCSIFMTU: | |
2754 | case SIOCSIFMAP: | |
2755 | case SIOCSIFHWADDR: | |
2756 | case SIOCSIFSLAVE: | |
2757 | case SIOCADDMULTI: | |
2758 | case SIOCDELMULTI: | |
2759 | case SIOCSIFHWBROADCAST: | |
2760 | case SIOCSIFTXQLEN: | |
2761 | case SIOCSMIIREG: | |
2762 | case SIOCBONDENSLAVE: | |
2763 | case SIOCBONDRELEASE: | |
2764 | case SIOCBONDSETHWADDR: | |
1da177e4 LT |
2765 | case SIOCBONDCHANGEACTIVE: |
2766 | case SIOCBRADDIF: | |
2767 | case SIOCBRDELIF: | |
2768 | if (!capable(CAP_NET_ADMIN)) | |
2769 | return -EPERM; | |
cabcac0b TG |
2770 | /* fall through */ |
2771 | case SIOCBONDSLAVEINFOQUERY: | |
2772 | case SIOCBONDINFOQUERY: | |
1da177e4 LT |
2773 | dev_load(ifr.ifr_name); |
2774 | rtnl_lock(); | |
2775 | ret = dev_ifsioc(&ifr, cmd); | |
2776 | rtnl_unlock(); | |
2777 | return ret; | |
2778 | ||
2779 | case SIOCGIFMEM: | |
2780 | /* Get the per device memory space. We can add this but | |
2781 | * currently do not support it */ | |
2782 | case SIOCSIFMEM: | |
2783 | /* Set the per device memory buffer space. | |
2784 | * Not applicable in our case */ | |
2785 | case SIOCSIFLINK: | |
2786 | return -EINVAL; | |
2787 | ||
2788 | /* | |
2789 | * Unknown or private ioctl. | |
2790 | */ | |
2791 | default: | |
2792 | if (cmd == SIOCWANDEV || | |
2793 | (cmd >= SIOCDEVPRIVATE && | |
2794 | cmd <= SIOCDEVPRIVATE + 15)) { | |
2795 | dev_load(ifr.ifr_name); | |
2796 | rtnl_lock(); | |
2797 | ret = dev_ifsioc(&ifr, cmd); | |
2798 | rtnl_unlock(); | |
2799 | if (!ret && copy_to_user(arg, &ifr, | |
2800 | sizeof(struct ifreq))) | |
2801 | ret = -EFAULT; | |
2802 | return ret; | |
2803 | } | |
d86b5e0e | 2804 | #ifdef CONFIG_WIRELESS_EXT |
1da177e4 LT |
2805 | /* Take care of Wireless Extensions */ |
2806 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) { | |
2807 | /* If command is `set a parameter', or | |
2808 | * `get the encoding parameters', check if | |
2809 | * the user has the right to do it */ | |
a417016d JT |
2810 | if (IW_IS_SET(cmd) || cmd == SIOCGIWENCODE |
2811 | || cmd == SIOCGIWENCODEEXT) { | |
1da177e4 LT |
2812 | if (!capable(CAP_NET_ADMIN)) |
2813 | return -EPERM; | |
2814 | } | |
2815 | dev_load(ifr.ifr_name); | |
2816 | rtnl_lock(); | |
2817 | /* Follow me in net/core/wireless.c */ | |
2818 | ret = wireless_process_ioctl(&ifr, cmd); | |
2819 | rtnl_unlock(); | |
2820 | if (IW_IS_GET(cmd) && | |
2821 | copy_to_user(arg, &ifr, | |
2822 | sizeof(struct ifreq))) | |
2823 | ret = -EFAULT; | |
2824 | return ret; | |
2825 | } | |
d86b5e0e | 2826 | #endif /* CONFIG_WIRELESS_EXT */ |
1da177e4 LT |
2827 | return -EINVAL; |
2828 | } | |
2829 | } | |
2830 | ||
2831 | ||
2832 | /** | |
2833 | * dev_new_index - allocate an ifindex | |
2834 | * | |
2835 | * Returns a suitable unique value for a new device interface | |
2836 | * number. The caller must hold the rtnl semaphore or the | |
2837 | * dev_base_lock to be sure it remains unique. | |
2838 | */ | |
2839 | static int dev_new_index(void) | |
2840 | { | |
2841 | static int ifindex; | |
2842 | for (;;) { | |
2843 | if (++ifindex <= 0) | |
2844 | ifindex = 1; | |
2845 | if (!__dev_get_by_index(ifindex)) | |
2846 | return ifindex; | |
2847 | } | |
2848 | } | |
2849 | ||
2850 | static int dev_boot_phase = 1; | |
2851 | ||
2852 | /* Delayed registration/unregisteration */ | |
2853 | static DEFINE_SPINLOCK(net_todo_list_lock); | |
2854 | static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list); | |
2855 | ||
2856 | static inline void net_set_todo(struct net_device *dev) | |
2857 | { | |
2858 | spin_lock(&net_todo_list_lock); | |
2859 | list_add_tail(&dev->todo_list, &net_todo_list); | |
2860 | spin_unlock(&net_todo_list_lock); | |
2861 | } | |
2862 | ||
2863 | /** | |
2864 | * register_netdevice - register a network device | |
2865 | * @dev: device to register | |
2866 | * | |
2867 | * Take a completed network device structure and add it to the kernel | |
2868 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
2869 | * chain. 0 is returned on success. A negative errno code is returned | |
2870 | * on a failure to set up the device, or if the name is a duplicate. | |
2871 | * | |
2872 | * Callers must hold the rtnl semaphore. You may want | |
2873 | * register_netdev() instead of this. | |
2874 | * | |
2875 | * BUGS: | |
2876 | * The locking appears insufficient to guarantee two parallel registers | |
2877 | * will not get the same name. | |
2878 | */ | |
2879 | ||
2880 | int register_netdevice(struct net_device *dev) | |
2881 | { | |
2882 | struct hlist_head *head; | |
2883 | struct hlist_node *p; | |
2884 | int ret; | |
2885 | ||
2886 | BUG_ON(dev_boot_phase); | |
2887 | ASSERT_RTNL(); | |
2888 | ||
b17a7c17 SH |
2889 | might_sleep(); |
2890 | ||
1da177e4 LT |
2891 | /* When net_device's are persistent, this will be fatal. */ |
2892 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
2893 | ||
2894 | spin_lock_init(&dev->queue_lock); | |
932ff279 | 2895 | spin_lock_init(&dev->_xmit_lock); |
1da177e4 LT |
2896 | dev->xmit_lock_owner = -1; |
2897 | #ifdef CONFIG_NET_CLS_ACT | |
2898 | spin_lock_init(&dev->ingress_lock); | |
2899 | #endif | |
2900 | ||
2901 | ret = alloc_divert_blk(dev); | |
2902 | if (ret) | |
2903 | goto out; | |
2904 | ||
2905 | dev->iflink = -1; | |
2906 | ||
2907 | /* Init, if this function is available */ | |
2908 | if (dev->init) { | |
2909 | ret = dev->init(dev); | |
2910 | if (ret) { | |
2911 | if (ret > 0) | |
2912 | ret = -EIO; | |
2913 | goto out_err; | |
2914 | } | |
2915 | } | |
2916 | ||
2917 | if (!dev_valid_name(dev->name)) { | |
2918 | ret = -EINVAL; | |
2919 | goto out_err; | |
2920 | } | |
2921 | ||
2922 | dev->ifindex = dev_new_index(); | |
2923 | if (dev->iflink == -1) | |
2924 | dev->iflink = dev->ifindex; | |
2925 | ||
2926 | /* Check for existence of name */ | |
2927 | head = dev_name_hash(dev->name); | |
2928 | hlist_for_each(p, head) { | |
2929 | struct net_device *d | |
2930 | = hlist_entry(p, struct net_device, name_hlist); | |
2931 | if (!strncmp(d->name, dev->name, IFNAMSIZ)) { | |
2932 | ret = -EEXIST; | |
2933 | goto out_err; | |
2934 | } | |
2935 | } | |
2936 | ||
2937 | /* Fix illegal SG+CSUM combinations. */ | |
2938 | if ((dev->features & NETIF_F_SG) && | |
8648b305 | 2939 | !(dev->features & NETIF_F_ALL_CSUM)) { |
5a8da02b | 2940 | printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n", |
1da177e4 LT |
2941 | dev->name); |
2942 | dev->features &= ~NETIF_F_SG; | |
2943 | } | |
2944 | ||
2945 | /* TSO requires that SG is present as well. */ | |
2946 | if ((dev->features & NETIF_F_TSO) && | |
2947 | !(dev->features & NETIF_F_SG)) { | |
5a8da02b | 2948 | printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n", |
1da177e4 LT |
2949 | dev->name); |
2950 | dev->features &= ~NETIF_F_TSO; | |
2951 | } | |
e89e9cf5 AR |
2952 | if (dev->features & NETIF_F_UFO) { |
2953 | if (!(dev->features & NETIF_F_HW_CSUM)) { | |
2954 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no " | |
2955 | "NETIF_F_HW_CSUM feature.\n", | |
2956 | dev->name); | |
2957 | dev->features &= ~NETIF_F_UFO; | |
2958 | } | |
2959 | if (!(dev->features & NETIF_F_SG)) { | |
2960 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no " | |
2961 | "NETIF_F_SG feature.\n", | |
2962 | dev->name); | |
2963 | dev->features &= ~NETIF_F_UFO; | |
2964 | } | |
2965 | } | |
1da177e4 LT |
2966 | |
2967 | /* | |
2968 | * nil rebuild_header routine, | |
2969 | * that should be never called and used as just bug trap. | |
2970 | */ | |
2971 | ||
2972 | if (!dev->rebuild_header) | |
2973 | dev->rebuild_header = default_rebuild_header; | |
2974 | ||
b17a7c17 SH |
2975 | ret = netdev_register_sysfs(dev); |
2976 | if (ret) | |
2977 | goto out_err; | |
2978 | dev->reg_state = NETREG_REGISTERED; | |
2979 | ||
1da177e4 LT |
2980 | /* |
2981 | * Default initial state at registry is that the | |
2982 | * device is present. | |
2983 | */ | |
2984 | ||
2985 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
2986 | ||
2987 | dev->next = NULL; | |
2988 | dev_init_scheduler(dev); | |
2989 | write_lock_bh(&dev_base_lock); | |
2990 | *dev_tail = dev; | |
2991 | dev_tail = &dev->next; | |
2992 | hlist_add_head(&dev->name_hlist, head); | |
2993 | hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex)); | |
2994 | dev_hold(dev); | |
1da177e4 LT |
2995 | write_unlock_bh(&dev_base_lock); |
2996 | ||
2997 | /* Notify protocols, that a new device appeared. */ | |
f07d5b94 | 2998 | raw_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev); |
1da177e4 | 2999 | |
1da177e4 LT |
3000 | ret = 0; |
3001 | ||
3002 | out: | |
3003 | return ret; | |
3004 | out_err: | |
3005 | free_divert_blk(dev); | |
3006 | goto out; | |
3007 | } | |
3008 | ||
3009 | /** | |
3010 | * register_netdev - register a network device | |
3011 | * @dev: device to register | |
3012 | * | |
3013 | * Take a completed network device structure and add it to the kernel | |
3014 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
3015 | * chain. 0 is returned on success. A negative errno code is returned | |
3016 | * on a failure to set up the device, or if the name is a duplicate. | |
3017 | * | |
3018 | * This is a wrapper around register_netdev that takes the rtnl semaphore | |
3019 | * and expands the device name if you passed a format string to | |
3020 | * alloc_netdev. | |
3021 | */ | |
3022 | int register_netdev(struct net_device *dev) | |
3023 | { | |
3024 | int err; | |
3025 | ||
3026 | rtnl_lock(); | |
3027 | ||
3028 | /* | |
3029 | * If the name is a format string the caller wants us to do a | |
3030 | * name allocation. | |
3031 | */ | |
3032 | if (strchr(dev->name, '%')) { | |
3033 | err = dev_alloc_name(dev, dev->name); | |
3034 | if (err < 0) | |
3035 | goto out; | |
3036 | } | |
3037 | ||
1da177e4 LT |
3038 | err = register_netdevice(dev); |
3039 | out: | |
3040 | rtnl_unlock(); | |
3041 | return err; | |
3042 | } | |
3043 | EXPORT_SYMBOL(register_netdev); | |
3044 | ||
3045 | /* | |
3046 | * netdev_wait_allrefs - wait until all references are gone. | |
3047 | * | |
3048 | * This is called when unregistering network devices. | |
3049 | * | |
3050 | * Any protocol or device that holds a reference should register | |
3051 | * for netdevice notification, and cleanup and put back the | |
3052 | * reference if they receive an UNREGISTER event. | |
3053 | * We can get stuck here if buggy protocols don't correctly | |
3054 | * call dev_put. | |
3055 | */ | |
3056 | static void netdev_wait_allrefs(struct net_device *dev) | |
3057 | { | |
3058 | unsigned long rebroadcast_time, warning_time; | |
3059 | ||
3060 | rebroadcast_time = warning_time = jiffies; | |
3061 | while (atomic_read(&dev->refcnt) != 0) { | |
3062 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { | |
6756ae4b | 3063 | rtnl_lock(); |
1da177e4 LT |
3064 | |
3065 | /* Rebroadcast unregister notification */ | |
f07d5b94 | 3066 | raw_notifier_call_chain(&netdev_chain, |
1da177e4 LT |
3067 | NETDEV_UNREGISTER, dev); |
3068 | ||
3069 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, | |
3070 | &dev->state)) { | |
3071 | /* We must not have linkwatch events | |
3072 | * pending on unregister. If this | |
3073 | * happens, we simply run the queue | |
3074 | * unscheduled, resulting in a noop | |
3075 | * for this device. | |
3076 | */ | |
3077 | linkwatch_run_queue(); | |
3078 | } | |
3079 | ||
6756ae4b | 3080 | __rtnl_unlock(); |
1da177e4 LT |
3081 | |
3082 | rebroadcast_time = jiffies; | |
3083 | } | |
3084 | ||
3085 | msleep(250); | |
3086 | ||
3087 | if (time_after(jiffies, warning_time + 10 * HZ)) { | |
3088 | printk(KERN_EMERG "unregister_netdevice: " | |
3089 | "waiting for %s to become free. Usage " | |
3090 | "count = %d\n", | |
3091 | dev->name, atomic_read(&dev->refcnt)); | |
3092 | warning_time = jiffies; | |
3093 | } | |
3094 | } | |
3095 | } | |
3096 | ||
3097 | /* The sequence is: | |
3098 | * | |
3099 | * rtnl_lock(); | |
3100 | * ... | |
3101 | * register_netdevice(x1); | |
3102 | * register_netdevice(x2); | |
3103 | * ... | |
3104 | * unregister_netdevice(y1); | |
3105 | * unregister_netdevice(y2); | |
3106 | * ... | |
3107 | * rtnl_unlock(); | |
3108 | * free_netdev(y1); | |
3109 | * free_netdev(y2); | |
3110 | * | |
3111 | * We are invoked by rtnl_unlock() after it drops the semaphore. | |
3112 | * This allows us to deal with problems: | |
b17a7c17 | 3113 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
3114 | * without deadlocking with linkwatch via keventd. |
3115 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
3116 | * safely in order to wait for the netdev refcnt to drop to zero. | |
3117 | */ | |
4a3e2f71 | 3118 | static DEFINE_MUTEX(net_todo_run_mutex); |
1da177e4 LT |
3119 | void netdev_run_todo(void) |
3120 | { | |
626ab0e6 | 3121 | struct list_head list; |
1da177e4 LT |
3122 | |
3123 | /* Need to guard against multiple cpu's getting out of order. */ | |
4a3e2f71 | 3124 | mutex_lock(&net_todo_run_mutex); |
1da177e4 LT |
3125 | |
3126 | /* Not safe to do outside the semaphore. We must not return | |
3127 | * until all unregister events invoked by the local processor | |
3128 | * have been completed (either by this todo run, or one on | |
3129 | * another cpu). | |
3130 | */ | |
3131 | if (list_empty(&net_todo_list)) | |
3132 | goto out; | |
3133 | ||
3134 | /* Snapshot list, allow later requests */ | |
3135 | spin_lock(&net_todo_list_lock); | |
626ab0e6 | 3136 | list_replace_init(&net_todo_list, &list); |
1da177e4 | 3137 | spin_unlock(&net_todo_list_lock); |
626ab0e6 | 3138 | |
1da177e4 LT |
3139 | while (!list_empty(&list)) { |
3140 | struct net_device *dev | |
3141 | = list_entry(list.next, struct net_device, todo_list); | |
3142 | list_del(&dev->todo_list); | |
3143 | ||
b17a7c17 SH |
3144 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
3145 | printk(KERN_ERR "network todo '%s' but state %d\n", | |
3146 | dev->name, dev->reg_state); | |
3147 | dump_stack(); | |
3148 | continue; | |
3149 | } | |
1da177e4 | 3150 | |
b17a7c17 SH |
3151 | netdev_unregister_sysfs(dev); |
3152 | dev->reg_state = NETREG_UNREGISTERED; | |
1da177e4 | 3153 | |
b17a7c17 | 3154 | netdev_wait_allrefs(dev); |
1da177e4 | 3155 | |
b17a7c17 SH |
3156 | /* paranoia */ |
3157 | BUG_ON(atomic_read(&dev->refcnt)); | |
3158 | BUG_TRAP(!dev->ip_ptr); | |
3159 | BUG_TRAP(!dev->ip6_ptr); | |
3160 | BUG_TRAP(!dev->dn_ptr); | |
1da177e4 | 3161 | |
b17a7c17 SH |
3162 | /* It must be the very last action, |
3163 | * after this 'dev' may point to freed up memory. | |
3164 | */ | |
3165 | if (dev->destructor) | |
3166 | dev->destructor(dev); | |
1da177e4 LT |
3167 | } |
3168 | ||
3169 | out: | |
4a3e2f71 | 3170 | mutex_unlock(&net_todo_run_mutex); |
1da177e4 LT |
3171 | } |
3172 | ||
3173 | /** | |
3174 | * alloc_netdev - allocate network device | |
3175 | * @sizeof_priv: size of private data to allocate space for | |
3176 | * @name: device name format string | |
3177 | * @setup: callback to initialize device | |
3178 | * | |
3179 | * Allocates a struct net_device with private data area for driver use | |
3180 | * and performs basic initialization. | |
3181 | */ | |
3182 | struct net_device *alloc_netdev(int sizeof_priv, const char *name, | |
3183 | void (*setup)(struct net_device *)) | |
3184 | { | |
3185 | void *p; | |
3186 | struct net_device *dev; | |
3187 | int alloc_size; | |
3188 | ||
b6fe17d6 SH |
3189 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
3190 | ||
1da177e4 LT |
3191 | /* ensure 32-byte alignment of both the device and private area */ |
3192 | alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST; | |
3193 | alloc_size += sizeof_priv + NETDEV_ALIGN_CONST; | |
3194 | ||
31380de9 | 3195 | p = kzalloc(alloc_size, GFP_KERNEL); |
1da177e4 | 3196 | if (!p) { |
b6fe17d6 | 3197 | printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n"); |
1da177e4 LT |
3198 | return NULL; |
3199 | } | |
1da177e4 LT |
3200 | |
3201 | dev = (struct net_device *) | |
3202 | (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); | |
3203 | dev->padded = (char *)dev - (char *)p; | |
3204 | ||
3205 | if (sizeof_priv) | |
3206 | dev->priv = netdev_priv(dev); | |
3207 | ||
3208 | setup(dev); | |
3209 | strcpy(dev->name, name); | |
3210 | return dev; | |
3211 | } | |
3212 | EXPORT_SYMBOL(alloc_netdev); | |
3213 | ||
3214 | /** | |
3215 | * free_netdev - free network device | |
3216 | * @dev: device | |
3217 | * | |
3218 | * This function does the last stage of destroying an allocated device | |
3219 | * interface. The reference to the device object is released. | |
3220 | * If this is the last reference then it will be freed. | |
3221 | */ | |
3222 | void free_netdev(struct net_device *dev) | |
3223 | { | |
3224 | #ifdef CONFIG_SYSFS | |
3041a069 | 3225 | /* Compatibility with error handling in drivers */ |
1da177e4 LT |
3226 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
3227 | kfree((char *)dev - dev->padded); | |
3228 | return; | |
3229 | } | |
3230 | ||
3231 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
3232 | dev->reg_state = NETREG_RELEASED; | |
3233 | ||
3234 | /* will free via class release */ | |
3235 | class_device_put(&dev->class_dev); | |
3236 | #else | |
3237 | kfree((char *)dev - dev->padded); | |
3238 | #endif | |
3239 | } | |
3240 | ||
3241 | /* Synchronize with packet receive processing. */ | |
3242 | void synchronize_net(void) | |
3243 | { | |
3244 | might_sleep(); | |
fbd568a3 | 3245 | synchronize_rcu(); |
1da177e4 LT |
3246 | } |
3247 | ||
3248 | /** | |
3249 | * unregister_netdevice - remove device from the kernel | |
3250 | * @dev: device | |
3251 | * | |
3252 | * This function shuts down a device interface and removes it | |
3253 | * from the kernel tables. On success 0 is returned, on a failure | |
3254 | * a negative errno code is returned. | |
3255 | * | |
3256 | * Callers must hold the rtnl semaphore. You may want | |
3257 | * unregister_netdev() instead of this. | |
3258 | */ | |
3259 | ||
3260 | int unregister_netdevice(struct net_device *dev) | |
3261 | { | |
3262 | struct net_device *d, **dp; | |
3263 | ||
3264 | BUG_ON(dev_boot_phase); | |
3265 | ASSERT_RTNL(); | |
3266 | ||
3267 | /* Some devices call without registering for initialization unwind. */ | |
3268 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
3269 | printk(KERN_DEBUG "unregister_netdevice: device %s/%p never " | |
3270 | "was registered\n", dev->name, dev); | |
3271 | return -ENODEV; | |
3272 | } | |
3273 | ||
3274 | BUG_ON(dev->reg_state != NETREG_REGISTERED); | |
3275 | ||
3276 | /* If device is running, close it first. */ | |
3277 | if (dev->flags & IFF_UP) | |
3278 | dev_close(dev); | |
3279 | ||
3280 | /* And unlink it from device chain. */ | |
3281 | for (dp = &dev_base; (d = *dp) != NULL; dp = &d->next) { | |
3282 | if (d == dev) { | |
3283 | write_lock_bh(&dev_base_lock); | |
3284 | hlist_del(&dev->name_hlist); | |
3285 | hlist_del(&dev->index_hlist); | |
3286 | if (dev_tail == &dev->next) | |
3287 | dev_tail = dp; | |
3288 | *dp = d->next; | |
3289 | write_unlock_bh(&dev_base_lock); | |
3290 | break; | |
3291 | } | |
3292 | } | |
3293 | if (!d) { | |
3294 | printk(KERN_ERR "unregister net_device: '%s' not found\n", | |
3295 | dev->name); | |
3296 | return -ENODEV; | |
3297 | } | |
3298 | ||
3299 | dev->reg_state = NETREG_UNREGISTERING; | |
3300 | ||
3301 | synchronize_net(); | |
3302 | ||
3303 | /* Shutdown queueing discipline. */ | |
3304 | dev_shutdown(dev); | |
3305 | ||
3306 | ||
3307 | /* Notify protocols, that we are about to destroy | |
3308 | this device. They should clean all the things. | |
3309 | */ | |
f07d5b94 | 3310 | raw_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev); |
1da177e4 LT |
3311 | |
3312 | /* | |
3313 | * Flush the multicast chain | |
3314 | */ | |
3315 | dev_mc_discard(dev); | |
3316 | ||
3317 | if (dev->uninit) | |
3318 | dev->uninit(dev); | |
3319 | ||
3320 | /* Notifier chain MUST detach us from master device. */ | |
3321 | BUG_TRAP(!dev->master); | |
3322 | ||
3323 | free_divert_blk(dev); | |
3324 | ||
3325 | /* Finish processing unregister after unlock */ | |
3326 | net_set_todo(dev); | |
3327 | ||
3328 | synchronize_net(); | |
3329 | ||
3330 | dev_put(dev); | |
3331 | return 0; | |
3332 | } | |
3333 | ||
3334 | /** | |
3335 | * unregister_netdev - remove device from the kernel | |
3336 | * @dev: device | |
3337 | * | |
3338 | * This function shuts down a device interface and removes it | |
3339 | * from the kernel tables. On success 0 is returned, on a failure | |
3340 | * a negative errno code is returned. | |
3341 | * | |
3342 | * This is just a wrapper for unregister_netdevice that takes | |
3343 | * the rtnl semaphore. In general you want to use this and not | |
3344 | * unregister_netdevice. | |
3345 | */ | |
3346 | void unregister_netdev(struct net_device *dev) | |
3347 | { | |
3348 | rtnl_lock(); | |
3349 | unregister_netdevice(dev); | |
3350 | rtnl_unlock(); | |
3351 | } | |
3352 | ||
3353 | EXPORT_SYMBOL(unregister_netdev); | |
3354 | ||
3355 | #ifdef CONFIG_HOTPLUG_CPU | |
3356 | static int dev_cpu_callback(struct notifier_block *nfb, | |
3357 | unsigned long action, | |
3358 | void *ocpu) | |
3359 | { | |
3360 | struct sk_buff **list_skb; | |
3361 | struct net_device **list_net; | |
3362 | struct sk_buff *skb; | |
3363 | unsigned int cpu, oldcpu = (unsigned long)ocpu; | |
3364 | struct softnet_data *sd, *oldsd; | |
3365 | ||
3366 | if (action != CPU_DEAD) | |
3367 | return NOTIFY_OK; | |
3368 | ||
3369 | local_irq_disable(); | |
3370 | cpu = smp_processor_id(); | |
3371 | sd = &per_cpu(softnet_data, cpu); | |
3372 | oldsd = &per_cpu(softnet_data, oldcpu); | |
3373 | ||
3374 | /* Find end of our completion_queue. */ | |
3375 | list_skb = &sd->completion_queue; | |
3376 | while (*list_skb) | |
3377 | list_skb = &(*list_skb)->next; | |
3378 | /* Append completion queue from offline CPU. */ | |
3379 | *list_skb = oldsd->completion_queue; | |
3380 | oldsd->completion_queue = NULL; | |
3381 | ||
3382 | /* Find end of our output_queue. */ | |
3383 | list_net = &sd->output_queue; | |
3384 | while (*list_net) | |
3385 | list_net = &(*list_net)->next_sched; | |
3386 | /* Append output queue from offline CPU. */ | |
3387 | *list_net = oldsd->output_queue; | |
3388 | oldsd->output_queue = NULL; | |
3389 | ||
3390 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
3391 | local_irq_enable(); | |
3392 | ||
3393 | /* Process offline CPU's input_pkt_queue */ | |
3394 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) | |
3395 | netif_rx(skb); | |
3396 | ||
3397 | return NOTIFY_OK; | |
3398 | } | |
3399 | #endif /* CONFIG_HOTPLUG_CPU */ | |
3400 | ||
db217334 CL |
3401 | #ifdef CONFIG_NET_DMA |
3402 | /** | |
3403 | * net_dma_rebalance - | |
3404 | * This is called when the number of channels allocated to the net_dma_client | |
3405 | * changes. The net_dma_client tries to have one DMA channel per CPU. | |
3406 | */ | |
3407 | static void net_dma_rebalance(void) | |
3408 | { | |
3409 | unsigned int cpu, i, n; | |
3410 | struct dma_chan *chan; | |
3411 | ||
db217334 CL |
3412 | if (net_dma_count == 0) { |
3413 | for_each_online_cpu(cpu) | |
29bbd72d | 3414 | rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL); |
db217334 CL |
3415 | return; |
3416 | } | |
3417 | ||
3418 | i = 0; | |
3419 | cpu = first_cpu(cpu_online_map); | |
3420 | ||
3421 | rcu_read_lock(); | |
3422 | list_for_each_entry(chan, &net_dma_client->channels, client_node) { | |
3423 | n = ((num_online_cpus() / net_dma_count) | |
3424 | + (i < (num_online_cpus() % net_dma_count) ? 1 : 0)); | |
3425 | ||
3426 | while(n) { | |
29bbd72d | 3427 | per_cpu(softnet_data, cpu).net_dma = chan; |
db217334 CL |
3428 | cpu = next_cpu(cpu, cpu_online_map); |
3429 | n--; | |
3430 | } | |
3431 | i++; | |
3432 | } | |
3433 | rcu_read_unlock(); | |
db217334 CL |
3434 | } |
3435 | ||
3436 | /** | |
3437 | * netdev_dma_event - event callback for the net_dma_client | |
3438 | * @client: should always be net_dma_client | |
f4b8ea78 RD |
3439 | * @chan: DMA channel for the event |
3440 | * @event: event type | |
db217334 CL |
3441 | */ |
3442 | static void netdev_dma_event(struct dma_client *client, struct dma_chan *chan, | |
3443 | enum dma_event event) | |
3444 | { | |
3445 | spin_lock(&net_dma_event_lock); | |
3446 | switch (event) { | |
3447 | case DMA_RESOURCE_ADDED: | |
3448 | net_dma_count++; | |
3449 | net_dma_rebalance(); | |
3450 | break; | |
3451 | case DMA_RESOURCE_REMOVED: | |
3452 | net_dma_count--; | |
3453 | net_dma_rebalance(); | |
3454 | break; | |
3455 | default: | |
3456 | break; | |
3457 | } | |
3458 | spin_unlock(&net_dma_event_lock); | |
3459 | } | |
3460 | ||
3461 | /** | |
3462 | * netdev_dma_regiser - register the networking subsystem as a DMA client | |
3463 | */ | |
3464 | static int __init netdev_dma_register(void) | |
3465 | { | |
3466 | spin_lock_init(&net_dma_event_lock); | |
3467 | net_dma_client = dma_async_client_register(netdev_dma_event); | |
3468 | if (net_dma_client == NULL) | |
3469 | return -ENOMEM; | |
3470 | ||
3471 | dma_async_client_chan_request(net_dma_client, num_online_cpus()); | |
3472 | return 0; | |
3473 | } | |
3474 | ||
3475 | #else | |
3476 | static int __init netdev_dma_register(void) { return -ENODEV; } | |
3477 | #endif /* CONFIG_NET_DMA */ | |
1da177e4 LT |
3478 | |
3479 | /* | |
3480 | * Initialize the DEV module. At boot time this walks the device list and | |
3481 | * unhooks any devices that fail to initialise (normally hardware not | |
3482 | * present) and leaves us with a valid list of present and active devices. | |
3483 | * | |
3484 | */ | |
3485 | ||
3486 | /* | |
3487 | * This is called single threaded during boot, so no need | |
3488 | * to take the rtnl semaphore. | |
3489 | */ | |
3490 | static int __init net_dev_init(void) | |
3491 | { | |
3492 | int i, rc = -ENOMEM; | |
3493 | ||
3494 | BUG_ON(!dev_boot_phase); | |
3495 | ||
1da177e4 LT |
3496 | if (dev_proc_init()) |
3497 | goto out; | |
3498 | ||
3499 | if (netdev_sysfs_init()) | |
3500 | goto out; | |
3501 | ||
3502 | INIT_LIST_HEAD(&ptype_all); | |
3503 | for (i = 0; i < 16; i++) | |
3504 | INIT_LIST_HEAD(&ptype_base[i]); | |
3505 | ||
3506 | for (i = 0; i < ARRAY_SIZE(dev_name_head); i++) | |
3507 | INIT_HLIST_HEAD(&dev_name_head[i]); | |
3508 | ||
3509 | for (i = 0; i < ARRAY_SIZE(dev_index_head); i++) | |
3510 | INIT_HLIST_HEAD(&dev_index_head[i]); | |
3511 | ||
3512 | /* | |
3513 | * Initialise the packet receive queues. | |
3514 | */ | |
3515 | ||
6f912042 | 3516 | for_each_possible_cpu(i) { |
1da177e4 LT |
3517 | struct softnet_data *queue; |
3518 | ||
3519 | queue = &per_cpu(softnet_data, i); | |
3520 | skb_queue_head_init(&queue->input_pkt_queue); | |
1da177e4 LT |
3521 | queue->completion_queue = NULL; |
3522 | INIT_LIST_HEAD(&queue->poll_list); | |
3523 | set_bit(__LINK_STATE_START, &queue->backlog_dev.state); | |
3524 | queue->backlog_dev.weight = weight_p; | |
3525 | queue->backlog_dev.poll = process_backlog; | |
3526 | atomic_set(&queue->backlog_dev.refcnt, 1); | |
3527 | } | |
3528 | ||
db217334 CL |
3529 | netdev_dma_register(); |
3530 | ||
1da177e4 LT |
3531 | dev_boot_phase = 0; |
3532 | ||
3533 | open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL); | |
3534 | open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL); | |
3535 | ||
3536 | hotcpu_notifier(dev_cpu_callback, 0); | |
3537 | dst_init(); | |
3538 | dev_mcast_init(); | |
3539 | rc = 0; | |
3540 | out: | |
3541 | return rc; | |
3542 | } | |
3543 | ||
3544 | subsys_initcall(net_dev_init); | |
3545 | ||
3546 | EXPORT_SYMBOL(__dev_get_by_index); | |
3547 | EXPORT_SYMBOL(__dev_get_by_name); | |
3548 | EXPORT_SYMBOL(__dev_remove_pack); | |
c2373ee9 | 3549 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
3550 | EXPORT_SYMBOL(dev_add_pack); |
3551 | EXPORT_SYMBOL(dev_alloc_name); | |
3552 | EXPORT_SYMBOL(dev_close); | |
3553 | EXPORT_SYMBOL(dev_get_by_flags); | |
3554 | EXPORT_SYMBOL(dev_get_by_index); | |
3555 | EXPORT_SYMBOL(dev_get_by_name); | |
1da177e4 LT |
3556 | EXPORT_SYMBOL(dev_open); |
3557 | EXPORT_SYMBOL(dev_queue_xmit); | |
3558 | EXPORT_SYMBOL(dev_remove_pack); | |
3559 | EXPORT_SYMBOL(dev_set_allmulti); | |
3560 | EXPORT_SYMBOL(dev_set_promiscuity); | |
3561 | EXPORT_SYMBOL(dev_change_flags); | |
3562 | EXPORT_SYMBOL(dev_set_mtu); | |
3563 | EXPORT_SYMBOL(dev_set_mac_address); | |
3564 | EXPORT_SYMBOL(free_netdev); | |
3565 | EXPORT_SYMBOL(netdev_boot_setup_check); | |
3566 | EXPORT_SYMBOL(netdev_set_master); | |
3567 | EXPORT_SYMBOL(netdev_state_change); | |
3568 | EXPORT_SYMBOL(netif_receive_skb); | |
3569 | EXPORT_SYMBOL(netif_rx); | |
3570 | EXPORT_SYMBOL(register_gifconf); | |
3571 | EXPORT_SYMBOL(register_netdevice); | |
3572 | EXPORT_SYMBOL(register_netdevice_notifier); | |
3573 | EXPORT_SYMBOL(skb_checksum_help); | |
3574 | EXPORT_SYMBOL(synchronize_net); | |
3575 | EXPORT_SYMBOL(unregister_netdevice); | |
3576 | EXPORT_SYMBOL(unregister_netdevice_notifier); | |
3577 | EXPORT_SYMBOL(net_enable_timestamp); | |
3578 | EXPORT_SYMBOL(net_disable_timestamp); | |
3579 | EXPORT_SYMBOL(dev_get_flags); | |
3580 | ||
3581 | #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) | |
3582 | EXPORT_SYMBOL(br_handle_frame_hook); | |
3583 | EXPORT_SYMBOL(br_fdb_get_hook); | |
3584 | EXPORT_SYMBOL(br_fdb_put_hook); | |
3585 | #endif | |
3586 | ||
3587 | #ifdef CONFIG_KMOD | |
3588 | EXPORT_SYMBOL(dev_load); | |
3589 | #endif | |
3590 | ||
3591 | EXPORT_PER_CPU_SYMBOL(softnet_data); |