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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> | |
b863ceb7 | 101 | #include <linux/if_macvlan.h> |
1da177e4 LT |
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> | |
295f4a1f | 113 | #include <net/wext.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> |
723e98b7 | 120 | #include <linux/if_arp.h> |
1da177e4 | 121 | |
1da177e4 LT |
122 | /* |
123 | * The list of packet types we will receive (as opposed to discard) | |
124 | * and the routines to invoke. | |
125 | * | |
126 | * Why 16. Because with 16 the only overlap we get on a hash of the | |
127 | * low nibble of the protocol value is RARP/SNAP/X.25. | |
128 | * | |
129 | * NOTE: That is no longer true with the addition of VLAN tags. Not | |
130 | * sure which should go first, but I bet it won't make much | |
131 | * difference if we are running VLANs. The good news is that | |
132 | * this protocol won't be in the list unless compiled in, so | |
3041a069 | 133 | * the average user (w/out VLANs) will not be adversely affected. |
1da177e4 LT |
134 | * --BLG |
135 | * | |
136 | * 0800 IP | |
137 | * 8100 802.1Q VLAN | |
138 | * 0001 802.3 | |
139 | * 0002 AX.25 | |
140 | * 0004 802.2 | |
141 | * 8035 RARP | |
142 | * 0005 SNAP | |
143 | * 0805 X.25 | |
144 | * 0806 ARP | |
145 | * 8137 IPX | |
146 | * 0009 Localtalk | |
147 | * 86DD IPv6 | |
148 | */ | |
149 | ||
150 | static DEFINE_SPINLOCK(ptype_lock); | |
6b2bedc3 SH |
151 | static struct list_head ptype_base[16] __read_mostly; /* 16 way hashed list */ |
152 | static struct list_head ptype_all __read_mostly; /* Taps */ | |
1da177e4 | 153 | |
db217334 | 154 | #ifdef CONFIG_NET_DMA |
d379b01e DW |
155 | struct net_dma { |
156 | struct dma_client client; | |
157 | spinlock_t lock; | |
158 | cpumask_t channel_mask; | |
159 | struct dma_chan *channels[NR_CPUS]; | |
160 | }; | |
161 | ||
162 | static enum dma_state_client | |
163 | netdev_dma_event(struct dma_client *client, struct dma_chan *chan, | |
164 | enum dma_state state); | |
165 | ||
166 | static struct net_dma net_dma = { | |
167 | .client = { | |
168 | .event_callback = netdev_dma_event, | |
169 | }, | |
170 | }; | |
db217334 CL |
171 | #endif |
172 | ||
1da177e4 | 173 | /* |
7562f876 | 174 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
175 | * semaphore. |
176 | * | |
177 | * Pure readers hold dev_base_lock for reading. | |
178 | * | |
179 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 180 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
181 | * actual updates. This allows pure readers to access the list even |
182 | * while a writer is preparing to update it. | |
183 | * | |
184 | * To put it another way, dev_base_lock is held for writing only to | |
185 | * protect against pure readers; the rtnl semaphore provides the | |
186 | * protection against other writers. | |
187 | * | |
188 | * See, for example usages, register_netdevice() and | |
189 | * unregister_netdevice(), which must be called with the rtnl | |
190 | * semaphore held. | |
191 | */ | |
7562f876 | 192 | LIST_HEAD(dev_base_head); |
1da177e4 LT |
193 | DEFINE_RWLOCK(dev_base_lock); |
194 | ||
7562f876 | 195 | EXPORT_SYMBOL(dev_base_head); |
1da177e4 LT |
196 | EXPORT_SYMBOL(dev_base_lock); |
197 | ||
198 | #define NETDEV_HASHBITS 8 | |
199 | static struct hlist_head dev_name_head[1<<NETDEV_HASHBITS]; | |
200 | static struct hlist_head dev_index_head[1<<NETDEV_HASHBITS]; | |
201 | ||
202 | static inline struct hlist_head *dev_name_hash(const char *name) | |
203 | { | |
204 | unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); | |
205 | return &dev_name_head[hash & ((1<<NETDEV_HASHBITS)-1)]; | |
206 | } | |
207 | ||
208 | static inline struct hlist_head *dev_index_hash(int ifindex) | |
209 | { | |
210 | return &dev_index_head[ifindex & ((1<<NETDEV_HASHBITS)-1)]; | |
211 | } | |
212 | ||
213 | /* | |
214 | * Our notifier list | |
215 | */ | |
216 | ||
f07d5b94 | 217 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
218 | |
219 | /* | |
220 | * Device drivers call our routines to queue packets here. We empty the | |
221 | * queue in the local softnet handler. | |
222 | */ | |
31aa02c5 | 223 | DEFINE_PER_CPU(struct softnet_data, softnet_data) = { NULL }; |
1da177e4 LT |
224 | |
225 | #ifdef CONFIG_SYSFS | |
226 | extern int netdev_sysfs_init(void); | |
227 | extern int netdev_register_sysfs(struct net_device *); | |
228 | extern void netdev_unregister_sysfs(struct net_device *); | |
229 | #else | |
230 | #define netdev_sysfs_init() (0) | |
231 | #define netdev_register_sysfs(dev) (0) | |
232 | #define netdev_unregister_sysfs(dev) do { } while(0) | |
233 | #endif | |
234 | ||
723e98b7 JP |
235 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
236 | /* | |
237 | * register_netdevice() inits dev->_xmit_lock and sets lockdep class | |
238 | * according to dev->type | |
239 | */ | |
240 | static const unsigned short netdev_lock_type[] = | |
241 | {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, | |
242 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, | |
243 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, | |
244 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, | |
245 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, | |
246 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, | |
247 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, | |
248 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, | |
249 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, | |
250 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, | |
251 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, | |
252 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, | |
253 | ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211, | |
254 | ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_VOID, | |
255 | ARPHRD_NONE}; | |
256 | ||
257 | static const char *netdev_lock_name[] = | |
258 | {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", | |
259 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", | |
260 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", | |
261 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", | |
262 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", | |
263 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", | |
264 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", | |
265 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", | |
266 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", | |
267 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", | |
268 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", | |
269 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", | |
270 | "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211", | |
271 | "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_VOID", | |
272 | "_xmit_NONE"}; | |
273 | ||
274 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; | |
275 | ||
276 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) | |
277 | { | |
278 | int i; | |
279 | ||
280 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) | |
281 | if (netdev_lock_type[i] == dev_type) | |
282 | return i; | |
283 | /* the last key is used by default */ | |
284 | return ARRAY_SIZE(netdev_lock_type) - 1; | |
285 | } | |
286 | ||
287 | static inline void netdev_set_lockdep_class(spinlock_t *lock, | |
288 | unsigned short dev_type) | |
289 | { | |
290 | int i; | |
291 | ||
292 | i = netdev_lock_pos(dev_type); | |
293 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], | |
294 | netdev_lock_name[i]); | |
295 | } | |
296 | #else | |
297 | static inline void netdev_set_lockdep_class(spinlock_t *lock, | |
298 | unsigned short dev_type) | |
299 | { | |
300 | } | |
301 | #endif | |
1da177e4 LT |
302 | |
303 | /******************************************************************************* | |
304 | ||
305 | Protocol management and registration routines | |
306 | ||
307 | *******************************************************************************/ | |
308 | ||
1da177e4 LT |
309 | /* |
310 | * Add a protocol ID to the list. Now that the input handler is | |
311 | * smarter we can dispense with all the messy stuff that used to be | |
312 | * here. | |
313 | * | |
314 | * BEWARE!!! Protocol handlers, mangling input packets, | |
315 | * MUST BE last in hash buckets and checking protocol handlers | |
316 | * MUST start from promiscuous ptype_all chain in net_bh. | |
317 | * It is true now, do not change it. | |
318 | * Explanation follows: if protocol handler, mangling packet, will | |
319 | * be the first on list, it is not able to sense, that packet | |
320 | * is cloned and should be copied-on-write, so that it will | |
321 | * change it and subsequent readers will get broken packet. | |
322 | * --ANK (980803) | |
323 | */ | |
324 | ||
325 | /** | |
326 | * dev_add_pack - add packet handler | |
327 | * @pt: packet type declaration | |
328 | * | |
329 | * Add a protocol handler to the networking stack. The passed &packet_type | |
330 | * is linked into kernel lists and may not be freed until it has been | |
331 | * removed from the kernel lists. | |
332 | * | |
4ec93edb | 333 | * This call does not sleep therefore it can not |
1da177e4 LT |
334 | * guarantee all CPU's that are in middle of receiving packets |
335 | * will see the new packet type (until the next received packet). | |
336 | */ | |
337 | ||
338 | void dev_add_pack(struct packet_type *pt) | |
339 | { | |
340 | int hash; | |
341 | ||
342 | spin_lock_bh(&ptype_lock); | |
9be9a6b9 | 343 | if (pt->type == htons(ETH_P_ALL)) |
1da177e4 | 344 | list_add_rcu(&pt->list, &ptype_all); |
9be9a6b9 | 345 | else { |
1da177e4 LT |
346 | hash = ntohs(pt->type) & 15; |
347 | list_add_rcu(&pt->list, &ptype_base[hash]); | |
348 | } | |
349 | spin_unlock_bh(&ptype_lock); | |
350 | } | |
351 | ||
1da177e4 LT |
352 | /** |
353 | * __dev_remove_pack - remove packet handler | |
354 | * @pt: packet type declaration | |
355 | * | |
356 | * Remove a protocol handler that was previously added to the kernel | |
357 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
358 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 359 | * returns. |
1da177e4 LT |
360 | * |
361 | * The packet type might still be in use by receivers | |
362 | * and must not be freed until after all the CPU's have gone | |
363 | * through a quiescent state. | |
364 | */ | |
365 | void __dev_remove_pack(struct packet_type *pt) | |
366 | { | |
367 | struct list_head *head; | |
368 | struct packet_type *pt1; | |
369 | ||
370 | spin_lock_bh(&ptype_lock); | |
371 | ||
9be9a6b9 | 372 | if (pt->type == htons(ETH_P_ALL)) |
1da177e4 | 373 | head = &ptype_all; |
9be9a6b9 | 374 | else |
1da177e4 LT |
375 | head = &ptype_base[ntohs(pt->type) & 15]; |
376 | ||
377 | list_for_each_entry(pt1, head, list) { | |
378 | if (pt == pt1) { | |
379 | list_del_rcu(&pt->list); | |
380 | goto out; | |
381 | } | |
382 | } | |
383 | ||
384 | printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt); | |
385 | out: | |
386 | spin_unlock_bh(&ptype_lock); | |
387 | } | |
388 | /** | |
389 | * dev_remove_pack - remove packet handler | |
390 | * @pt: packet type declaration | |
391 | * | |
392 | * Remove a protocol handler that was previously added to the kernel | |
393 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
394 | * from the kernel lists and can be freed or reused once this function | |
395 | * returns. | |
396 | * | |
397 | * This call sleeps to guarantee that no CPU is looking at the packet | |
398 | * type after return. | |
399 | */ | |
400 | void dev_remove_pack(struct packet_type *pt) | |
401 | { | |
402 | __dev_remove_pack(pt); | |
4ec93edb | 403 | |
1da177e4 LT |
404 | synchronize_net(); |
405 | } | |
406 | ||
407 | /****************************************************************************** | |
408 | ||
409 | Device Boot-time Settings Routines | |
410 | ||
411 | *******************************************************************************/ | |
412 | ||
413 | /* Boot time configuration table */ | |
414 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
415 | ||
416 | /** | |
417 | * netdev_boot_setup_add - add new setup entry | |
418 | * @name: name of the device | |
419 | * @map: configured settings for the device | |
420 | * | |
421 | * Adds new setup entry to the dev_boot_setup list. The function | |
422 | * returns 0 on error and 1 on success. This is a generic routine to | |
423 | * all netdevices. | |
424 | */ | |
425 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
426 | { | |
427 | struct netdev_boot_setup *s; | |
428 | int i; | |
429 | ||
430 | s = dev_boot_setup; | |
431 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
432 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
433 | memset(s[i].name, 0, sizeof(s[i].name)); | |
434 | strcpy(s[i].name, name); | |
435 | memcpy(&s[i].map, map, sizeof(s[i].map)); | |
436 | break; | |
437 | } | |
438 | } | |
439 | ||
440 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
441 | } | |
442 | ||
443 | /** | |
444 | * netdev_boot_setup_check - check boot time settings | |
445 | * @dev: the netdevice | |
446 | * | |
447 | * Check boot time settings for the device. | |
448 | * The found settings are set for the device to be used | |
449 | * later in the device probing. | |
450 | * Returns 0 if no settings found, 1 if they are. | |
451 | */ | |
452 | int netdev_boot_setup_check(struct net_device *dev) | |
453 | { | |
454 | struct netdev_boot_setup *s = dev_boot_setup; | |
455 | int i; | |
456 | ||
457 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
458 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
459 | !strncmp(dev->name, s[i].name, strlen(s[i].name))) { | |
460 | dev->irq = s[i].map.irq; | |
461 | dev->base_addr = s[i].map.base_addr; | |
462 | dev->mem_start = s[i].map.mem_start; | |
463 | dev->mem_end = s[i].map.mem_end; | |
464 | return 1; | |
465 | } | |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
470 | ||
471 | /** | |
472 | * netdev_boot_base - get address from boot time settings | |
473 | * @prefix: prefix for network device | |
474 | * @unit: id for network device | |
475 | * | |
476 | * Check boot time settings for the base address of device. | |
477 | * The found settings are set for the device to be used | |
478 | * later in the device probing. | |
479 | * Returns 0 if no settings found. | |
480 | */ | |
481 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
482 | { | |
483 | const struct netdev_boot_setup *s = dev_boot_setup; | |
484 | char name[IFNAMSIZ]; | |
485 | int i; | |
486 | ||
487 | sprintf(name, "%s%d", prefix, unit); | |
488 | ||
489 | /* | |
490 | * If device already registered then return base of 1 | |
491 | * to indicate not to probe for this interface | |
492 | */ | |
493 | if (__dev_get_by_name(name)) | |
494 | return 1; | |
495 | ||
496 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
497 | if (!strcmp(name, s[i].name)) | |
498 | return s[i].map.base_addr; | |
499 | return 0; | |
500 | } | |
501 | ||
502 | /* | |
503 | * Saves at boot time configured settings for any netdevice. | |
504 | */ | |
505 | int __init netdev_boot_setup(char *str) | |
506 | { | |
507 | int ints[5]; | |
508 | struct ifmap map; | |
509 | ||
510 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
511 | if (!str || !*str) | |
512 | return 0; | |
513 | ||
514 | /* Save settings */ | |
515 | memset(&map, 0, sizeof(map)); | |
516 | if (ints[0] > 0) | |
517 | map.irq = ints[1]; | |
518 | if (ints[0] > 1) | |
519 | map.base_addr = ints[2]; | |
520 | if (ints[0] > 2) | |
521 | map.mem_start = ints[3]; | |
522 | if (ints[0] > 3) | |
523 | map.mem_end = ints[4]; | |
524 | ||
525 | /* Add new entry to the list */ | |
526 | return netdev_boot_setup_add(str, &map); | |
527 | } | |
528 | ||
529 | __setup("netdev=", netdev_boot_setup); | |
530 | ||
531 | /******************************************************************************* | |
532 | ||
533 | Device Interface Subroutines | |
534 | ||
535 | *******************************************************************************/ | |
536 | ||
537 | /** | |
538 | * __dev_get_by_name - find a device by its name | |
539 | * @name: name to find | |
540 | * | |
541 | * Find an interface by name. Must be called under RTNL semaphore | |
542 | * or @dev_base_lock. If the name is found a pointer to the device | |
543 | * is returned. If the name is not found then %NULL is returned. The | |
544 | * reference counters are not incremented so the caller must be | |
545 | * careful with locks. | |
546 | */ | |
547 | ||
548 | struct net_device *__dev_get_by_name(const char *name) | |
549 | { | |
550 | struct hlist_node *p; | |
551 | ||
552 | hlist_for_each(p, dev_name_hash(name)) { | |
553 | struct net_device *dev | |
554 | = hlist_entry(p, struct net_device, name_hlist); | |
555 | if (!strncmp(dev->name, name, IFNAMSIZ)) | |
556 | return dev; | |
557 | } | |
558 | return NULL; | |
559 | } | |
560 | ||
561 | /** | |
562 | * dev_get_by_name - find a device by its name | |
563 | * @name: name to find | |
564 | * | |
565 | * Find an interface by name. This can be called from any | |
566 | * context and does its own locking. The returned handle has | |
567 | * the usage count incremented and the caller must use dev_put() to | |
568 | * release it when it is no longer needed. %NULL is returned if no | |
569 | * matching device is found. | |
570 | */ | |
571 | ||
572 | struct net_device *dev_get_by_name(const char *name) | |
573 | { | |
574 | struct net_device *dev; | |
575 | ||
576 | read_lock(&dev_base_lock); | |
577 | dev = __dev_get_by_name(name); | |
578 | if (dev) | |
579 | dev_hold(dev); | |
580 | read_unlock(&dev_base_lock); | |
581 | return dev; | |
582 | } | |
583 | ||
584 | /** | |
585 | * __dev_get_by_index - find a device by its ifindex | |
586 | * @ifindex: index of device | |
587 | * | |
588 | * Search for an interface by index. Returns %NULL if the device | |
589 | * is not found or a pointer to the device. The device has not | |
590 | * had its reference counter increased so the caller must be careful | |
591 | * about locking. The caller must hold either the RTNL semaphore | |
592 | * or @dev_base_lock. | |
593 | */ | |
594 | ||
595 | struct net_device *__dev_get_by_index(int ifindex) | |
596 | { | |
597 | struct hlist_node *p; | |
598 | ||
599 | hlist_for_each(p, dev_index_hash(ifindex)) { | |
600 | struct net_device *dev | |
601 | = hlist_entry(p, struct net_device, index_hlist); | |
602 | if (dev->ifindex == ifindex) | |
603 | return dev; | |
604 | } | |
605 | return NULL; | |
606 | } | |
607 | ||
608 | ||
609 | /** | |
610 | * dev_get_by_index - find a device by its ifindex | |
611 | * @ifindex: index of device | |
612 | * | |
613 | * Search for an interface by index. Returns NULL if the device | |
614 | * is not found or a pointer to the device. The device returned has | |
615 | * had a reference added and the pointer is safe until the user calls | |
616 | * dev_put to indicate they have finished with it. | |
617 | */ | |
618 | ||
619 | struct net_device *dev_get_by_index(int ifindex) | |
620 | { | |
621 | struct net_device *dev; | |
622 | ||
623 | read_lock(&dev_base_lock); | |
624 | dev = __dev_get_by_index(ifindex); | |
625 | if (dev) | |
626 | dev_hold(dev); | |
627 | read_unlock(&dev_base_lock); | |
628 | return dev; | |
629 | } | |
630 | ||
631 | /** | |
632 | * dev_getbyhwaddr - find a device by its hardware address | |
633 | * @type: media type of device | |
634 | * @ha: hardware address | |
635 | * | |
636 | * Search for an interface by MAC address. Returns NULL if the device | |
637 | * is not found or a pointer to the device. The caller must hold the | |
638 | * rtnl semaphore. The returned device has not had its ref count increased | |
639 | * and the caller must therefore be careful about locking | |
640 | * | |
641 | * BUGS: | |
642 | * If the API was consistent this would be __dev_get_by_hwaddr | |
643 | */ | |
644 | ||
645 | struct net_device *dev_getbyhwaddr(unsigned short type, char *ha) | |
646 | { | |
647 | struct net_device *dev; | |
648 | ||
649 | ASSERT_RTNL(); | |
650 | ||
7562f876 | 651 | for_each_netdev(dev) |
1da177e4 LT |
652 | if (dev->type == type && |
653 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
654 | return dev; |
655 | ||
656 | return NULL; | |
1da177e4 LT |
657 | } |
658 | ||
cf309e3f JF |
659 | EXPORT_SYMBOL(dev_getbyhwaddr); |
660 | ||
4e9cac2b | 661 | struct net_device *__dev_getfirstbyhwtype(unsigned short type) |
1da177e4 LT |
662 | { |
663 | struct net_device *dev; | |
664 | ||
4e9cac2b | 665 | ASSERT_RTNL(); |
7562f876 | 666 | for_each_netdev(dev) |
4e9cac2b | 667 | if (dev->type == type) |
7562f876 PE |
668 | return dev; |
669 | ||
670 | return NULL; | |
4e9cac2b PM |
671 | } |
672 | ||
673 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); | |
674 | ||
675 | struct net_device *dev_getfirstbyhwtype(unsigned short type) | |
676 | { | |
677 | struct net_device *dev; | |
678 | ||
679 | rtnl_lock(); | |
680 | dev = __dev_getfirstbyhwtype(type); | |
681 | if (dev) | |
682 | dev_hold(dev); | |
1da177e4 LT |
683 | rtnl_unlock(); |
684 | return dev; | |
685 | } | |
686 | ||
687 | EXPORT_SYMBOL(dev_getfirstbyhwtype); | |
688 | ||
689 | /** | |
690 | * dev_get_by_flags - find any device with given flags | |
691 | * @if_flags: IFF_* values | |
692 | * @mask: bitmask of bits in if_flags to check | |
693 | * | |
694 | * Search for any interface with the given flags. Returns NULL if a device | |
4ec93edb | 695 | * is not found or a pointer to the device. The device returned has |
1da177e4 LT |
696 | * had a reference added and the pointer is safe until the user calls |
697 | * dev_put to indicate they have finished with it. | |
698 | */ | |
699 | ||
700 | struct net_device * dev_get_by_flags(unsigned short if_flags, unsigned short mask) | |
701 | { | |
7562f876 | 702 | struct net_device *dev, *ret; |
1da177e4 | 703 | |
7562f876 | 704 | ret = NULL; |
1da177e4 | 705 | read_lock(&dev_base_lock); |
7562f876 | 706 | for_each_netdev(dev) { |
1da177e4 LT |
707 | if (((dev->flags ^ if_flags) & mask) == 0) { |
708 | dev_hold(dev); | |
7562f876 | 709 | ret = dev; |
1da177e4 LT |
710 | break; |
711 | } | |
712 | } | |
713 | read_unlock(&dev_base_lock); | |
7562f876 | 714 | return ret; |
1da177e4 LT |
715 | } |
716 | ||
717 | /** | |
718 | * dev_valid_name - check if name is okay for network device | |
719 | * @name: name string | |
720 | * | |
721 | * Network device names need to be valid file names to | |
c7fa9d18 DM |
722 | * to allow sysfs to work. We also disallow any kind of |
723 | * whitespace. | |
1da177e4 | 724 | */ |
c2373ee9 | 725 | int dev_valid_name(const char *name) |
1da177e4 | 726 | { |
c7fa9d18 DM |
727 | if (*name == '\0') |
728 | return 0; | |
b6fe17d6 SH |
729 | if (strlen(name) >= IFNAMSIZ) |
730 | return 0; | |
c7fa9d18 DM |
731 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
732 | return 0; | |
733 | ||
734 | while (*name) { | |
735 | if (*name == '/' || isspace(*name)) | |
736 | return 0; | |
737 | name++; | |
738 | } | |
739 | return 1; | |
1da177e4 LT |
740 | } |
741 | ||
742 | /** | |
743 | * dev_alloc_name - allocate a name for a device | |
744 | * @dev: device | |
745 | * @name: name format string | |
746 | * | |
747 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
748 | * id. It scans list of devices to build up a free map, then chooses |
749 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
750 | * while allocating the name and adding the device in order to avoid | |
751 | * duplicates. | |
752 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
753 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
754 | */ |
755 | ||
756 | int dev_alloc_name(struct net_device *dev, const char *name) | |
757 | { | |
758 | int i = 0; | |
759 | char buf[IFNAMSIZ]; | |
760 | const char *p; | |
761 | const int max_netdevices = 8*PAGE_SIZE; | |
762 | long *inuse; | |
763 | struct net_device *d; | |
764 | ||
765 | p = strnchr(name, IFNAMSIZ-1, '%'); | |
766 | if (p) { | |
767 | /* | |
768 | * Verify the string as this thing may have come from | |
769 | * the user. There must be either one "%d" and no other "%" | |
770 | * characters. | |
771 | */ | |
772 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
773 | return -EINVAL; | |
774 | ||
775 | /* Use one page as a bit array of possible slots */ | |
776 | inuse = (long *) get_zeroed_page(GFP_ATOMIC); | |
777 | if (!inuse) | |
778 | return -ENOMEM; | |
779 | ||
7562f876 | 780 | for_each_netdev(d) { |
1da177e4 LT |
781 | if (!sscanf(d->name, name, &i)) |
782 | continue; | |
783 | if (i < 0 || i >= max_netdevices) | |
784 | continue; | |
785 | ||
786 | /* avoid cases where sscanf is not exact inverse of printf */ | |
787 | snprintf(buf, sizeof(buf), name, i); | |
788 | if (!strncmp(buf, d->name, IFNAMSIZ)) | |
789 | set_bit(i, inuse); | |
790 | } | |
791 | ||
792 | i = find_first_zero_bit(inuse, max_netdevices); | |
793 | free_page((unsigned long) inuse); | |
794 | } | |
795 | ||
796 | snprintf(buf, sizeof(buf), name, i); | |
797 | if (!__dev_get_by_name(buf)) { | |
798 | strlcpy(dev->name, buf, IFNAMSIZ); | |
799 | return i; | |
800 | } | |
801 | ||
802 | /* It is possible to run out of possible slots | |
803 | * when the name is long and there isn't enough space left | |
804 | * for the digits, or if all bits are used. | |
805 | */ | |
806 | return -ENFILE; | |
807 | } | |
808 | ||
809 | ||
810 | /** | |
811 | * dev_change_name - change name of a device | |
812 | * @dev: device | |
813 | * @newname: name (or format string) must be at least IFNAMSIZ | |
814 | * | |
815 | * Change name of a device, can pass format strings "eth%d". | |
816 | * for wildcarding. | |
817 | */ | |
818 | int dev_change_name(struct net_device *dev, char *newname) | |
819 | { | |
fcc5a03a | 820 | char oldname[IFNAMSIZ]; |
1da177e4 | 821 | int err = 0; |
fcc5a03a | 822 | int ret; |
1da177e4 LT |
823 | |
824 | ASSERT_RTNL(); | |
825 | ||
826 | if (dev->flags & IFF_UP) | |
827 | return -EBUSY; | |
828 | ||
829 | if (!dev_valid_name(newname)) | |
830 | return -EINVAL; | |
831 | ||
fcc5a03a HX |
832 | memcpy(oldname, dev->name, IFNAMSIZ); |
833 | ||
1da177e4 LT |
834 | if (strchr(newname, '%')) { |
835 | err = dev_alloc_name(dev, newname); | |
836 | if (err < 0) | |
837 | return err; | |
838 | strcpy(newname, dev->name); | |
839 | } | |
840 | else if (__dev_get_by_name(newname)) | |
841 | return -EEXIST; | |
842 | else | |
843 | strlcpy(dev->name, newname, IFNAMSIZ); | |
844 | ||
fcc5a03a | 845 | rollback: |
92749821 | 846 | device_rename(&dev->dev, dev->name); |
7f988eab HX |
847 | |
848 | write_lock_bh(&dev_base_lock); | |
92749821 EB |
849 | hlist_del(&dev->name_hlist); |
850 | hlist_add_head(&dev->name_hlist, dev_name_hash(dev->name)); | |
7f988eab HX |
851 | write_unlock_bh(&dev_base_lock); |
852 | ||
fcc5a03a HX |
853 | ret = raw_notifier_call_chain(&netdev_chain, NETDEV_CHANGENAME, dev); |
854 | ret = notifier_to_errno(ret); | |
855 | ||
856 | if (ret) { | |
857 | if (err) { | |
858 | printk(KERN_ERR | |
859 | "%s: name change rollback failed: %d.\n", | |
860 | dev->name, ret); | |
861 | } else { | |
862 | err = ret; | |
863 | memcpy(dev->name, oldname, IFNAMSIZ); | |
864 | goto rollback; | |
865 | } | |
866 | } | |
1da177e4 LT |
867 | |
868 | return err; | |
869 | } | |
870 | ||
d8a33ac4 | 871 | /** |
3041a069 | 872 | * netdev_features_change - device changes features |
d8a33ac4 SH |
873 | * @dev: device to cause notification |
874 | * | |
875 | * Called to indicate a device has changed features. | |
876 | */ | |
877 | void netdev_features_change(struct net_device *dev) | |
878 | { | |
f07d5b94 | 879 | raw_notifier_call_chain(&netdev_chain, NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
880 | } |
881 | EXPORT_SYMBOL(netdev_features_change); | |
882 | ||
1da177e4 LT |
883 | /** |
884 | * netdev_state_change - device changes state | |
885 | * @dev: device to cause notification | |
886 | * | |
887 | * Called to indicate a device has changed state. This function calls | |
888 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
889 | * to the routing socket. | |
890 | */ | |
891 | void netdev_state_change(struct net_device *dev) | |
892 | { | |
893 | if (dev->flags & IFF_UP) { | |
f07d5b94 | 894 | raw_notifier_call_chain(&netdev_chain, |
e041c683 | 895 | NETDEV_CHANGE, dev); |
1da177e4 LT |
896 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); |
897 | } | |
898 | } | |
899 | ||
900 | /** | |
901 | * dev_load - load a network module | |
902 | * @name: name of interface | |
903 | * | |
904 | * If a network interface is not present and the process has suitable | |
905 | * privileges this function loads the module. If module loading is not | |
906 | * available in this kernel then it becomes a nop. | |
907 | */ | |
908 | ||
909 | void dev_load(const char *name) | |
910 | { | |
4ec93edb | 911 | struct net_device *dev; |
1da177e4 LT |
912 | |
913 | read_lock(&dev_base_lock); | |
914 | dev = __dev_get_by_name(name); | |
915 | read_unlock(&dev_base_lock); | |
916 | ||
917 | if (!dev && capable(CAP_SYS_MODULE)) | |
918 | request_module("%s", name); | |
919 | } | |
920 | ||
921 | static int default_rebuild_header(struct sk_buff *skb) | |
922 | { | |
923 | printk(KERN_DEBUG "%s: default_rebuild_header called -- BUG!\n", | |
924 | skb->dev ? skb->dev->name : "NULL!!!"); | |
925 | kfree_skb(skb); | |
926 | return 1; | |
927 | } | |
928 | ||
1da177e4 LT |
929 | /** |
930 | * dev_open - prepare an interface for use. | |
931 | * @dev: device to open | |
932 | * | |
933 | * Takes a device from down to up state. The device's private open | |
934 | * function is invoked and then the multicast lists are loaded. Finally | |
935 | * the device is moved into the up state and a %NETDEV_UP message is | |
936 | * sent to the netdev notifier chain. | |
937 | * | |
938 | * Calling this function on an active interface is a nop. On a failure | |
939 | * a negative errno code is returned. | |
940 | */ | |
941 | int dev_open(struct net_device *dev) | |
942 | { | |
943 | int ret = 0; | |
944 | ||
945 | /* | |
946 | * Is it already up? | |
947 | */ | |
948 | ||
949 | if (dev->flags & IFF_UP) | |
950 | return 0; | |
951 | ||
952 | /* | |
953 | * Is it even present? | |
954 | */ | |
955 | if (!netif_device_present(dev)) | |
956 | return -ENODEV; | |
957 | ||
958 | /* | |
959 | * Call device private open method | |
960 | */ | |
961 | set_bit(__LINK_STATE_START, &dev->state); | |
962 | if (dev->open) { | |
963 | ret = dev->open(dev); | |
964 | if (ret) | |
965 | clear_bit(__LINK_STATE_START, &dev->state); | |
966 | } | |
967 | ||
4ec93edb | 968 | /* |
1da177e4 LT |
969 | * If it went open OK then: |
970 | */ | |
971 | ||
972 | if (!ret) { | |
973 | /* | |
974 | * Set the flags. | |
975 | */ | |
976 | dev->flags |= IFF_UP; | |
977 | ||
978 | /* | |
979 | * Initialize multicasting status | |
980 | */ | |
4417da66 | 981 | dev_set_rx_mode(dev); |
1da177e4 LT |
982 | |
983 | /* | |
984 | * Wakeup transmit queue engine | |
985 | */ | |
986 | dev_activate(dev); | |
987 | ||
988 | /* | |
989 | * ... and announce new interface. | |
990 | */ | |
f07d5b94 | 991 | raw_notifier_call_chain(&netdev_chain, NETDEV_UP, dev); |
1da177e4 LT |
992 | } |
993 | return ret; | |
994 | } | |
995 | ||
996 | /** | |
997 | * dev_close - shutdown an interface. | |
998 | * @dev: device to shutdown | |
999 | * | |
1000 | * This function moves an active device into down state. A | |
1001 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1002 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1003 | * chain. | |
1004 | */ | |
1005 | int dev_close(struct net_device *dev) | |
1006 | { | |
1007 | if (!(dev->flags & IFF_UP)) | |
1008 | return 0; | |
1009 | ||
1010 | /* | |
1011 | * Tell people we are going down, so that they can | |
1012 | * prepare to death, when device is still operating. | |
1013 | */ | |
f07d5b94 | 1014 | raw_notifier_call_chain(&netdev_chain, NETDEV_GOING_DOWN, dev); |
1da177e4 LT |
1015 | |
1016 | dev_deactivate(dev); | |
1017 | ||
1018 | clear_bit(__LINK_STATE_START, &dev->state); | |
1019 | ||
1020 | /* Synchronize to scheduled poll. We cannot touch poll list, | |
1021 | * it can be even on different cpu. So just clear netif_running(), | |
1022 | * and wait when poll really will happen. Actually, the best place | |
1023 | * for this is inside dev->stop() after device stopped its irq | |
1024 | * engine, but this requires more changes in devices. */ | |
1025 | ||
1026 | smp_mb__after_clear_bit(); /* Commit netif_running(). */ | |
1027 | while (test_bit(__LINK_STATE_RX_SCHED, &dev->state)) { | |
1028 | /* No hurry. */ | |
6192b54b | 1029 | msleep(1); |
1da177e4 LT |
1030 | } |
1031 | ||
1032 | /* | |
1033 | * Call the device specific close. This cannot fail. | |
1034 | * Only if device is UP | |
1035 | * | |
1036 | * We allow it to be called even after a DETACH hot-plug | |
1037 | * event. | |
1038 | */ | |
1039 | if (dev->stop) | |
1040 | dev->stop(dev); | |
1041 | ||
1042 | /* | |
1043 | * Device is now down. | |
1044 | */ | |
1045 | ||
1046 | dev->flags &= ~IFF_UP; | |
1047 | ||
1048 | /* | |
1049 | * Tell people we are down | |
1050 | */ | |
f07d5b94 | 1051 | raw_notifier_call_chain(&netdev_chain, NETDEV_DOWN, dev); |
1da177e4 LT |
1052 | |
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | ||
1057 | /* | |
1058 | * Device change register/unregister. These are not inline or static | |
1059 | * as we export them to the world. | |
1060 | */ | |
1061 | ||
1062 | /** | |
1063 | * register_netdevice_notifier - register a network notifier block | |
1064 | * @nb: notifier | |
1065 | * | |
1066 | * Register a notifier to be called when network device events occur. | |
1067 | * The notifier passed is linked into the kernel structures and must | |
1068 | * not be reused until it has been unregistered. A negative errno code | |
1069 | * is returned on a failure. | |
1070 | * | |
1071 | * When registered all registration and up events are replayed | |
4ec93edb | 1072 | * to the new notifier to allow device to have a race free |
1da177e4 LT |
1073 | * view of the network device list. |
1074 | */ | |
1075 | ||
1076 | int register_netdevice_notifier(struct notifier_block *nb) | |
1077 | { | |
1078 | struct net_device *dev; | |
fcc5a03a | 1079 | struct net_device *last; |
1da177e4 LT |
1080 | int err; |
1081 | ||
1082 | rtnl_lock(); | |
f07d5b94 | 1083 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1084 | if (err) |
1085 | goto unlock; | |
1da177e4 | 1086 | |
fcc5a03a HX |
1087 | for_each_netdev(dev) { |
1088 | err = nb->notifier_call(nb, NETDEV_REGISTER, dev); | |
1089 | err = notifier_to_errno(err); | |
1090 | if (err) | |
1091 | goto rollback; | |
1092 | ||
1093 | if (!(dev->flags & IFF_UP)) | |
1094 | continue; | |
1095 | ||
1096 | nb->notifier_call(nb, NETDEV_UP, dev); | |
1da177e4 | 1097 | } |
fcc5a03a HX |
1098 | |
1099 | unlock: | |
1da177e4 LT |
1100 | rtnl_unlock(); |
1101 | return err; | |
fcc5a03a HX |
1102 | |
1103 | rollback: | |
1104 | last = dev; | |
1105 | for_each_netdev(dev) { | |
1106 | if (dev == last) | |
1107 | break; | |
1108 | ||
1109 | if (dev->flags & IFF_UP) { | |
1110 | nb->notifier_call(nb, NETDEV_GOING_DOWN, dev); | |
1111 | nb->notifier_call(nb, NETDEV_DOWN, dev); | |
1112 | } | |
1113 | nb->notifier_call(nb, NETDEV_UNREGISTER, dev); | |
1114 | } | |
1115 | goto unlock; | |
1da177e4 LT |
1116 | } |
1117 | ||
1118 | /** | |
1119 | * unregister_netdevice_notifier - unregister a network notifier block | |
1120 | * @nb: notifier | |
1121 | * | |
1122 | * Unregister a notifier previously registered by | |
1123 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1124 | * kernel structures and may then be reused. A negative errno code | |
1125 | * is returned on a failure. | |
1126 | */ | |
1127 | ||
1128 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1129 | { | |
9f514950 HX |
1130 | int err; |
1131 | ||
1132 | rtnl_lock(); | |
f07d5b94 | 1133 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
9f514950 HX |
1134 | rtnl_unlock(); |
1135 | return err; | |
1da177e4 LT |
1136 | } |
1137 | ||
1138 | /** | |
1139 | * call_netdevice_notifiers - call all network notifier blocks | |
1140 | * @val: value passed unmodified to notifier function | |
1141 | * @v: pointer passed unmodified to notifier function | |
1142 | * | |
1143 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 1144 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
1145 | */ |
1146 | ||
1147 | int call_netdevice_notifiers(unsigned long val, void *v) | |
1148 | { | |
f07d5b94 | 1149 | return raw_notifier_call_chain(&netdev_chain, val, v); |
1da177e4 LT |
1150 | } |
1151 | ||
1152 | /* When > 0 there are consumers of rx skb time stamps */ | |
1153 | static atomic_t netstamp_needed = ATOMIC_INIT(0); | |
1154 | ||
1155 | void net_enable_timestamp(void) | |
1156 | { | |
1157 | atomic_inc(&netstamp_needed); | |
1158 | } | |
1159 | ||
1160 | void net_disable_timestamp(void) | |
1161 | { | |
1162 | atomic_dec(&netstamp_needed); | |
1163 | } | |
1164 | ||
a61bbcf2 | 1165 | static inline void net_timestamp(struct sk_buff *skb) |
1da177e4 LT |
1166 | { |
1167 | if (atomic_read(&netstamp_needed)) | |
a61bbcf2 | 1168 | __net_timestamp(skb); |
b7aa0bf7 ED |
1169 | else |
1170 | skb->tstamp.tv64 = 0; | |
1da177e4 LT |
1171 | } |
1172 | ||
1173 | /* | |
1174 | * Support routine. Sends outgoing frames to any network | |
1175 | * taps currently in use. | |
1176 | */ | |
1177 | ||
f6a78bfc | 1178 | static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
1179 | { |
1180 | struct packet_type *ptype; | |
a61bbcf2 PM |
1181 | |
1182 | net_timestamp(skb); | |
1da177e4 LT |
1183 | |
1184 | rcu_read_lock(); | |
1185 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
1186 | /* Never send packets back to the socket | |
1187 | * they originated from - MvS (miquels@drinkel.ow.org) | |
1188 | */ | |
1189 | if ((ptype->dev == dev || !ptype->dev) && | |
1190 | (ptype->af_packet_priv == NULL || | |
1191 | (struct sock *)ptype->af_packet_priv != skb->sk)) { | |
1192 | struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC); | |
1193 | if (!skb2) | |
1194 | break; | |
1195 | ||
1196 | /* skb->nh should be correctly | |
1197 | set by sender, so that the second statement is | |
1198 | just protection against buggy protocols. | |
1199 | */ | |
459a98ed | 1200 | skb_reset_mac_header(skb2); |
1da177e4 | 1201 | |
d56f90a7 | 1202 | if (skb_network_header(skb2) < skb2->data || |
27a884dc | 1203 | skb2->network_header > skb2->tail) { |
1da177e4 LT |
1204 | if (net_ratelimit()) |
1205 | printk(KERN_CRIT "protocol %04x is " | |
1206 | "buggy, dev %s\n", | |
1207 | skb2->protocol, dev->name); | |
c1d2bbe1 | 1208 | skb_reset_network_header(skb2); |
1da177e4 LT |
1209 | } |
1210 | ||
b0e380b1 | 1211 | skb2->transport_header = skb2->network_header; |
1da177e4 | 1212 | skb2->pkt_type = PACKET_OUTGOING; |
f2ccd8fa | 1213 | ptype->func(skb2, skb->dev, ptype, skb->dev); |
1da177e4 LT |
1214 | } |
1215 | } | |
1216 | rcu_read_unlock(); | |
1217 | } | |
1218 | ||
56079431 DV |
1219 | |
1220 | void __netif_schedule(struct net_device *dev) | |
1221 | { | |
1222 | if (!test_and_set_bit(__LINK_STATE_SCHED, &dev->state)) { | |
1223 | unsigned long flags; | |
1224 | struct softnet_data *sd; | |
1225 | ||
1226 | local_irq_save(flags); | |
1227 | sd = &__get_cpu_var(softnet_data); | |
1228 | dev->next_sched = sd->output_queue; | |
1229 | sd->output_queue = dev; | |
1230 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
1231 | local_irq_restore(flags); | |
1232 | } | |
1233 | } | |
1234 | EXPORT_SYMBOL(__netif_schedule); | |
1235 | ||
1236 | void __netif_rx_schedule(struct net_device *dev) | |
1237 | { | |
1238 | unsigned long flags; | |
1239 | ||
1240 | local_irq_save(flags); | |
1241 | dev_hold(dev); | |
1242 | list_add_tail(&dev->poll_list, &__get_cpu_var(softnet_data).poll_list); | |
1243 | if (dev->quota < 0) | |
1244 | dev->quota += dev->weight; | |
1245 | else | |
1246 | dev->quota = dev->weight; | |
1247 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
1248 | local_irq_restore(flags); | |
1249 | } | |
1250 | EXPORT_SYMBOL(__netif_rx_schedule); | |
1251 | ||
1252 | void dev_kfree_skb_any(struct sk_buff *skb) | |
1253 | { | |
1254 | if (in_irq() || irqs_disabled()) | |
1255 | dev_kfree_skb_irq(skb); | |
1256 | else | |
1257 | dev_kfree_skb(skb); | |
1258 | } | |
1259 | EXPORT_SYMBOL(dev_kfree_skb_any); | |
1260 | ||
1261 | ||
1262 | /* Hot-plugging. */ | |
1263 | void netif_device_detach(struct net_device *dev) | |
1264 | { | |
1265 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
1266 | netif_running(dev)) { | |
1267 | netif_stop_queue(dev); | |
1268 | } | |
1269 | } | |
1270 | EXPORT_SYMBOL(netif_device_detach); | |
1271 | ||
1272 | void netif_device_attach(struct net_device *dev) | |
1273 | { | |
1274 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
1275 | netif_running(dev)) { | |
1276 | netif_wake_queue(dev); | |
4ec93edb | 1277 | __netdev_watchdog_up(dev); |
56079431 DV |
1278 | } |
1279 | } | |
1280 | EXPORT_SYMBOL(netif_device_attach); | |
1281 | ||
1282 | ||
1da177e4 LT |
1283 | /* |
1284 | * Invalidate hardware checksum when packet is to be mangled, and | |
1285 | * complete checksum manually on outgoing path. | |
1286 | */ | |
84fa7933 | 1287 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 1288 | { |
d3bc23e7 | 1289 | __wsum csum; |
663ead3b | 1290 | int ret = 0, offset; |
1da177e4 | 1291 | |
84fa7933 | 1292 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
1293 | goto out_set_summed; |
1294 | ||
1295 | if (unlikely(skb_shinfo(skb)->gso_size)) { | |
a430a43d HX |
1296 | /* Let GSO fix up the checksum. */ |
1297 | goto out_set_summed; | |
1da177e4 LT |
1298 | } |
1299 | ||
1300 | if (skb_cloned(skb)) { | |
1301 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); | |
1302 | if (ret) | |
1303 | goto out; | |
1304 | } | |
1305 | ||
663ead3b | 1306 | offset = skb->csum_start - skb_headroom(skb); |
09a62660 | 1307 | BUG_ON(offset > (int)skb->len); |
1da177e4 LT |
1308 | csum = skb_checksum(skb, offset, skb->len-offset, 0); |
1309 | ||
663ead3b | 1310 | offset = skb_headlen(skb) - offset; |
09a62660 | 1311 | BUG_ON(offset <= 0); |
ff1dcadb | 1312 | BUG_ON(skb->csum_offset + 2 > offset); |
1da177e4 | 1313 | |
663ead3b HX |
1314 | *(__sum16 *)(skb->head + skb->csum_start + skb->csum_offset) = |
1315 | csum_fold(csum); | |
a430a43d | 1316 | out_set_summed: |
1da177e4 | 1317 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 1318 | out: |
1da177e4 LT |
1319 | return ret; |
1320 | } | |
1321 | ||
f6a78bfc HX |
1322 | /** |
1323 | * skb_gso_segment - Perform segmentation on skb. | |
1324 | * @skb: buffer to segment | |
576a30eb | 1325 | * @features: features for the output path (see dev->features) |
f6a78bfc HX |
1326 | * |
1327 | * This function segments the given skb and returns a list of segments. | |
576a30eb HX |
1328 | * |
1329 | * It may return NULL if the skb requires no segmentation. This is | |
1330 | * only possible when GSO is used for verifying header integrity. | |
f6a78bfc | 1331 | */ |
576a30eb | 1332 | struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features) |
f6a78bfc HX |
1333 | { |
1334 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
1335 | struct packet_type *ptype; | |
252e3346 | 1336 | __be16 type = skb->protocol; |
a430a43d | 1337 | int err; |
f6a78bfc HX |
1338 | |
1339 | BUG_ON(skb_shinfo(skb)->frag_list); | |
f6a78bfc | 1340 | |
459a98ed | 1341 | skb_reset_mac_header(skb); |
b0e380b1 | 1342 | skb->mac_len = skb->network_header - skb->mac_header; |
f6a78bfc HX |
1343 | __skb_pull(skb, skb->mac_len); |
1344 | ||
f9d106a6 | 1345 | if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) { |
a430a43d HX |
1346 | if (skb_header_cloned(skb) && |
1347 | (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) | |
1348 | return ERR_PTR(err); | |
1349 | } | |
1350 | ||
f6a78bfc HX |
1351 | rcu_read_lock(); |
1352 | list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type) & 15], list) { | |
1353 | if (ptype->type == type && !ptype->dev && ptype->gso_segment) { | |
84fa7933 | 1354 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
a430a43d HX |
1355 | err = ptype->gso_send_check(skb); |
1356 | segs = ERR_PTR(err); | |
1357 | if (err || skb_gso_ok(skb, features)) | |
1358 | break; | |
d56f90a7 ACM |
1359 | __skb_push(skb, (skb->data - |
1360 | skb_network_header(skb))); | |
a430a43d | 1361 | } |
576a30eb | 1362 | segs = ptype->gso_segment(skb, features); |
f6a78bfc HX |
1363 | break; |
1364 | } | |
1365 | } | |
1366 | rcu_read_unlock(); | |
1367 | ||
98e399f8 | 1368 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 1369 | |
f6a78bfc HX |
1370 | return segs; |
1371 | } | |
1372 | ||
1373 | EXPORT_SYMBOL(skb_gso_segment); | |
1374 | ||
fb286bb2 HX |
1375 | /* Take action when hardware reception checksum errors are detected. */ |
1376 | #ifdef CONFIG_BUG | |
1377 | void netdev_rx_csum_fault(struct net_device *dev) | |
1378 | { | |
1379 | if (net_ratelimit()) { | |
4ec93edb | 1380 | printk(KERN_ERR "%s: hw csum failure.\n", |
246a4212 | 1381 | dev ? dev->name : "<unknown>"); |
fb286bb2 HX |
1382 | dump_stack(); |
1383 | } | |
1384 | } | |
1385 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
1386 | #endif | |
1387 | ||
1da177e4 LT |
1388 | /* Actually, we should eliminate this check as soon as we know, that: |
1389 | * 1. IOMMU is present and allows to map all the memory. | |
1390 | * 2. No high memory really exists on this machine. | |
1391 | */ | |
1392 | ||
1393 | static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb) | |
1394 | { | |
3d3a8533 | 1395 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
1396 | int i; |
1397 | ||
1398 | if (dev->features & NETIF_F_HIGHDMA) | |
1399 | return 0; | |
1400 | ||
1401 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) | |
1402 | if (PageHighMem(skb_shinfo(skb)->frags[i].page)) | |
1403 | return 1; | |
1404 | ||
3d3a8533 | 1405 | #endif |
1da177e4 LT |
1406 | return 0; |
1407 | } | |
1da177e4 | 1408 | |
f6a78bfc HX |
1409 | struct dev_gso_cb { |
1410 | void (*destructor)(struct sk_buff *skb); | |
1411 | }; | |
1412 | ||
1413 | #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) | |
1414 | ||
1415 | static void dev_gso_skb_destructor(struct sk_buff *skb) | |
1416 | { | |
1417 | struct dev_gso_cb *cb; | |
1418 | ||
1419 | do { | |
1420 | struct sk_buff *nskb = skb->next; | |
1421 | ||
1422 | skb->next = nskb->next; | |
1423 | nskb->next = NULL; | |
1424 | kfree_skb(nskb); | |
1425 | } while (skb->next); | |
1426 | ||
1427 | cb = DEV_GSO_CB(skb); | |
1428 | if (cb->destructor) | |
1429 | cb->destructor(skb); | |
1430 | } | |
1431 | ||
1432 | /** | |
1433 | * dev_gso_segment - Perform emulated hardware segmentation on skb. | |
1434 | * @skb: buffer to segment | |
1435 | * | |
1436 | * This function segments the given skb and stores the list of segments | |
1437 | * in skb->next. | |
1438 | */ | |
1439 | static int dev_gso_segment(struct sk_buff *skb) | |
1440 | { | |
1441 | struct net_device *dev = skb->dev; | |
1442 | struct sk_buff *segs; | |
576a30eb HX |
1443 | int features = dev->features & ~(illegal_highdma(dev, skb) ? |
1444 | NETIF_F_SG : 0); | |
1445 | ||
1446 | segs = skb_gso_segment(skb, features); | |
1447 | ||
1448 | /* Verifying header integrity only. */ | |
1449 | if (!segs) | |
1450 | return 0; | |
f6a78bfc | 1451 | |
f6a78bfc HX |
1452 | if (unlikely(IS_ERR(segs))) |
1453 | return PTR_ERR(segs); | |
1454 | ||
1455 | skb->next = segs; | |
1456 | DEV_GSO_CB(skb)->destructor = skb->destructor; | |
1457 | skb->destructor = dev_gso_skb_destructor; | |
1458 | ||
1459 | return 0; | |
1460 | } | |
1461 | ||
1462 | int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
1463 | { | |
1464 | if (likely(!skb->next)) { | |
9be9a6b9 | 1465 | if (!list_empty(&ptype_all)) |
f6a78bfc HX |
1466 | dev_queue_xmit_nit(skb, dev); |
1467 | ||
576a30eb HX |
1468 | if (netif_needs_gso(dev, skb)) { |
1469 | if (unlikely(dev_gso_segment(skb))) | |
1470 | goto out_kfree_skb; | |
1471 | if (skb->next) | |
1472 | goto gso; | |
1473 | } | |
f6a78bfc | 1474 | |
576a30eb | 1475 | return dev->hard_start_xmit(skb, dev); |
f6a78bfc HX |
1476 | } |
1477 | ||
576a30eb | 1478 | gso: |
f6a78bfc HX |
1479 | do { |
1480 | struct sk_buff *nskb = skb->next; | |
1481 | int rc; | |
1482 | ||
1483 | skb->next = nskb->next; | |
1484 | nskb->next = NULL; | |
1485 | rc = dev->hard_start_xmit(nskb, dev); | |
1486 | if (unlikely(rc)) { | |
f54d9e8d | 1487 | nskb->next = skb->next; |
f6a78bfc HX |
1488 | skb->next = nskb; |
1489 | return rc; | |
1490 | } | |
f25f4e44 PWJ |
1491 | if (unlikely((netif_queue_stopped(dev) || |
1492 | netif_subqueue_stopped(dev, skb->queue_mapping)) && | |
1493 | skb->next)) | |
f54d9e8d | 1494 | return NETDEV_TX_BUSY; |
f6a78bfc | 1495 | } while (skb->next); |
4ec93edb | 1496 | |
f6a78bfc HX |
1497 | skb->destructor = DEV_GSO_CB(skb)->destructor; |
1498 | ||
1499 | out_kfree_skb: | |
1500 | kfree_skb(skb); | |
1501 | return 0; | |
1502 | } | |
1503 | ||
1da177e4 LT |
1504 | #define HARD_TX_LOCK(dev, cpu) { \ |
1505 | if ((dev->features & NETIF_F_LLTX) == 0) { \ | |
932ff279 | 1506 | netif_tx_lock(dev); \ |
1da177e4 LT |
1507 | } \ |
1508 | } | |
1509 | ||
1510 | #define HARD_TX_UNLOCK(dev) { \ | |
1511 | if ((dev->features & NETIF_F_LLTX) == 0) { \ | |
932ff279 | 1512 | netif_tx_unlock(dev); \ |
1da177e4 LT |
1513 | } \ |
1514 | } | |
1515 | ||
1516 | /** | |
1517 | * dev_queue_xmit - transmit a buffer | |
1518 | * @skb: buffer to transmit | |
1519 | * | |
1520 | * Queue a buffer for transmission to a network device. The caller must | |
1521 | * have set the device and priority and built the buffer before calling | |
1522 | * this function. The function can be called from an interrupt. | |
1523 | * | |
1524 | * A negative errno code is returned on a failure. A success does not | |
1525 | * guarantee the frame will be transmitted as it may be dropped due | |
1526 | * to congestion or traffic shaping. | |
af191367 BG |
1527 | * |
1528 | * ----------------------------------------------------------------------------------- | |
1529 | * I notice this method can also return errors from the queue disciplines, | |
1530 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
1531 | * be positive. | |
1532 | * | |
1533 | * Regardless of the return value, the skb is consumed, so it is currently | |
1534 | * difficult to retry a send to this method. (You can bump the ref count | |
1535 | * before sending to hold a reference for retry if you are careful.) | |
1536 | * | |
1537 | * When calling this method, interrupts MUST be enabled. This is because | |
1538 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
1539 | * --BLG | |
1da177e4 LT |
1540 | */ |
1541 | ||
1542 | int dev_queue_xmit(struct sk_buff *skb) | |
1543 | { | |
1544 | struct net_device *dev = skb->dev; | |
1545 | struct Qdisc *q; | |
1546 | int rc = -ENOMEM; | |
1547 | ||
f6a78bfc HX |
1548 | /* GSO will handle the following emulations directly. */ |
1549 | if (netif_needs_gso(dev, skb)) | |
1550 | goto gso; | |
1551 | ||
1da177e4 LT |
1552 | if (skb_shinfo(skb)->frag_list && |
1553 | !(dev->features & NETIF_F_FRAGLIST) && | |
364c6bad | 1554 | __skb_linearize(skb)) |
1da177e4 LT |
1555 | goto out_kfree_skb; |
1556 | ||
1557 | /* Fragmented skb is linearized if device does not support SG, | |
1558 | * or if at least one of fragments is in highmem and device | |
1559 | * does not support DMA from it. | |
1560 | */ | |
1561 | if (skb_shinfo(skb)->nr_frags && | |
1562 | (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) && | |
364c6bad | 1563 | __skb_linearize(skb)) |
1da177e4 LT |
1564 | goto out_kfree_skb; |
1565 | ||
1566 | /* If packet is not checksummed and device does not support | |
1567 | * checksumming for this protocol, complete checksumming here. | |
1568 | */ | |
663ead3b HX |
1569 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1570 | skb_set_transport_header(skb, skb->csum_start - | |
1571 | skb_headroom(skb)); | |
1572 | ||
a298830c HX |
1573 | if (!(dev->features & NETIF_F_GEN_CSUM) && |
1574 | !((dev->features & NETIF_F_IP_CSUM) && | |
1575 | skb->protocol == htons(ETH_P_IP)) && | |
1576 | !((dev->features & NETIF_F_IPV6_CSUM) && | |
1577 | skb->protocol == htons(ETH_P_IPV6))) | |
663ead3b HX |
1578 | if (skb_checksum_help(skb)) |
1579 | goto out_kfree_skb; | |
1580 | } | |
1da177e4 | 1581 | |
f6a78bfc | 1582 | gso: |
2d7ceece ED |
1583 | spin_lock_prefetch(&dev->queue_lock); |
1584 | ||
4ec93edb YH |
1585 | /* Disable soft irqs for various locks below. Also |
1586 | * stops preemption for RCU. | |
1da177e4 | 1587 | */ |
4ec93edb | 1588 | rcu_read_lock_bh(); |
1da177e4 | 1589 | |
4ec93edb YH |
1590 | /* Updates of qdisc are serialized by queue_lock. |
1591 | * The struct Qdisc which is pointed to by qdisc is now a | |
1592 | * rcu structure - it may be accessed without acquiring | |
1da177e4 | 1593 | * a lock (but the structure may be stale.) The freeing of the |
4ec93edb | 1594 | * qdisc will be deferred until it's known that there are no |
1da177e4 | 1595 | * more references to it. |
4ec93edb YH |
1596 | * |
1597 | * If the qdisc has an enqueue function, we still need to | |
1da177e4 LT |
1598 | * hold the queue_lock before calling it, since queue_lock |
1599 | * also serializes access to the device queue. | |
1600 | */ | |
1601 | ||
1602 | q = rcu_dereference(dev->qdisc); | |
1603 | #ifdef CONFIG_NET_CLS_ACT | |
1604 | skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS); | |
1605 | #endif | |
1606 | if (q->enqueue) { | |
1607 | /* Grab device queue */ | |
1608 | spin_lock(&dev->queue_lock); | |
85670cc1 PM |
1609 | q = dev->qdisc; |
1610 | if (q->enqueue) { | |
f25f4e44 PWJ |
1611 | /* reset queue_mapping to zero */ |
1612 | skb->queue_mapping = 0; | |
85670cc1 PM |
1613 | rc = q->enqueue(skb, q); |
1614 | qdisc_run(dev); | |
1615 | spin_unlock(&dev->queue_lock); | |
1da177e4 | 1616 | |
85670cc1 PM |
1617 | rc = rc == NET_XMIT_BYPASS ? NET_XMIT_SUCCESS : rc; |
1618 | goto out; | |
1619 | } | |
1da177e4 | 1620 | spin_unlock(&dev->queue_lock); |
1da177e4 LT |
1621 | } |
1622 | ||
1623 | /* The device has no queue. Common case for software devices: | |
1624 | loopback, all the sorts of tunnels... | |
1625 | ||
932ff279 HX |
1626 | Really, it is unlikely that netif_tx_lock protection is necessary |
1627 | here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
1da177e4 LT |
1628 | counters.) |
1629 | However, it is possible, that they rely on protection | |
1630 | made by us here. | |
1631 | ||
1632 | Check this and shot the lock. It is not prone from deadlocks. | |
1633 | Either shot noqueue qdisc, it is even simpler 8) | |
1634 | */ | |
1635 | if (dev->flags & IFF_UP) { | |
1636 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
1637 | ||
1638 | if (dev->xmit_lock_owner != cpu) { | |
1639 | ||
1640 | HARD_TX_LOCK(dev, cpu); | |
1641 | ||
f25f4e44 PWJ |
1642 | if (!netif_queue_stopped(dev) && |
1643 | !netif_subqueue_stopped(dev, skb->queue_mapping)) { | |
1da177e4 | 1644 | rc = 0; |
f6a78bfc | 1645 | if (!dev_hard_start_xmit(skb, dev)) { |
1da177e4 LT |
1646 | HARD_TX_UNLOCK(dev); |
1647 | goto out; | |
1648 | } | |
1649 | } | |
1650 | HARD_TX_UNLOCK(dev); | |
1651 | if (net_ratelimit()) | |
1652 | printk(KERN_CRIT "Virtual device %s asks to " | |
1653 | "queue packet!\n", dev->name); | |
1654 | } else { | |
1655 | /* Recursion is detected! It is possible, | |
1656 | * unfortunately */ | |
1657 | if (net_ratelimit()) | |
1658 | printk(KERN_CRIT "Dead loop on virtual device " | |
1659 | "%s, fix it urgently!\n", dev->name); | |
1660 | } | |
1661 | } | |
1662 | ||
1663 | rc = -ENETDOWN; | |
d4828d85 | 1664 | rcu_read_unlock_bh(); |
1da177e4 LT |
1665 | |
1666 | out_kfree_skb: | |
1667 | kfree_skb(skb); | |
1668 | return rc; | |
1669 | out: | |
d4828d85 | 1670 | rcu_read_unlock_bh(); |
1da177e4 LT |
1671 | return rc; |
1672 | } | |
1673 | ||
1674 | ||
1675 | /*======================================================================= | |
1676 | Receiver routines | |
1677 | =======================================================================*/ | |
1678 | ||
6b2bedc3 SH |
1679 | int netdev_max_backlog __read_mostly = 1000; |
1680 | int netdev_budget __read_mostly = 300; | |
1681 | int weight_p __read_mostly = 64; /* old backlog weight */ | |
1da177e4 LT |
1682 | |
1683 | DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, }; | |
1684 | ||
1685 | ||
1da177e4 LT |
1686 | /** |
1687 | * netif_rx - post buffer to the network code | |
1688 | * @skb: buffer to post | |
1689 | * | |
1690 | * This function receives a packet from a device driver and queues it for | |
1691 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
1692 | * may be dropped during processing for congestion control or by the | |
1693 | * protocol layers. | |
1694 | * | |
1695 | * return values: | |
1696 | * NET_RX_SUCCESS (no congestion) | |
1697 | * NET_RX_CN_LOW (low congestion) | |
1698 | * NET_RX_CN_MOD (moderate congestion) | |
1699 | * NET_RX_CN_HIGH (high congestion) | |
1700 | * NET_RX_DROP (packet was dropped) | |
1701 | * | |
1702 | */ | |
1703 | ||
1704 | int netif_rx(struct sk_buff *skb) | |
1705 | { | |
1da177e4 LT |
1706 | struct softnet_data *queue; |
1707 | unsigned long flags; | |
1708 | ||
1709 | /* if netpoll wants it, pretend we never saw it */ | |
1710 | if (netpoll_rx(skb)) | |
1711 | return NET_RX_DROP; | |
1712 | ||
b7aa0bf7 | 1713 | if (!skb->tstamp.tv64) |
a61bbcf2 | 1714 | net_timestamp(skb); |
1da177e4 LT |
1715 | |
1716 | /* | |
1717 | * The code is rearranged so that the path is the most | |
1718 | * short when CPU is congested, but is still operating. | |
1719 | */ | |
1720 | local_irq_save(flags); | |
1da177e4 LT |
1721 | queue = &__get_cpu_var(softnet_data); |
1722 | ||
1723 | __get_cpu_var(netdev_rx_stat).total++; | |
1724 | if (queue->input_pkt_queue.qlen <= netdev_max_backlog) { | |
1725 | if (queue->input_pkt_queue.qlen) { | |
1da177e4 LT |
1726 | enqueue: |
1727 | dev_hold(skb->dev); | |
1728 | __skb_queue_tail(&queue->input_pkt_queue, skb); | |
1da177e4 | 1729 | local_irq_restore(flags); |
34008d8c | 1730 | return NET_RX_SUCCESS; |
1da177e4 LT |
1731 | } |
1732 | ||
1da177e4 LT |
1733 | netif_rx_schedule(&queue->backlog_dev); |
1734 | goto enqueue; | |
1735 | } | |
1736 | ||
1da177e4 LT |
1737 | __get_cpu_var(netdev_rx_stat).dropped++; |
1738 | local_irq_restore(flags); | |
1739 | ||
1740 | kfree_skb(skb); | |
1741 | return NET_RX_DROP; | |
1742 | } | |
1743 | ||
1744 | int netif_rx_ni(struct sk_buff *skb) | |
1745 | { | |
1746 | int err; | |
1747 | ||
1748 | preempt_disable(); | |
1749 | err = netif_rx(skb); | |
1750 | if (local_softirq_pending()) | |
1751 | do_softirq(); | |
1752 | preempt_enable(); | |
1753 | ||
1754 | return err; | |
1755 | } | |
1756 | ||
1757 | EXPORT_SYMBOL(netif_rx_ni); | |
1758 | ||
f2ccd8fa | 1759 | static inline struct net_device *skb_bond(struct sk_buff *skb) |
1da177e4 LT |
1760 | { |
1761 | struct net_device *dev = skb->dev; | |
1762 | ||
8f903c70 | 1763 | if (dev->master) { |
7ea49ed7 | 1764 | if (skb_bond_should_drop(skb)) { |
8f903c70 JV |
1765 | kfree_skb(skb); |
1766 | return NULL; | |
1767 | } | |
1da177e4 | 1768 | skb->dev = dev->master; |
8f903c70 | 1769 | } |
f2ccd8fa DM |
1770 | |
1771 | return dev; | |
1da177e4 LT |
1772 | } |
1773 | ||
1774 | static void net_tx_action(struct softirq_action *h) | |
1775 | { | |
1776 | struct softnet_data *sd = &__get_cpu_var(softnet_data); | |
1777 | ||
1778 | if (sd->completion_queue) { | |
1779 | struct sk_buff *clist; | |
1780 | ||
1781 | local_irq_disable(); | |
1782 | clist = sd->completion_queue; | |
1783 | sd->completion_queue = NULL; | |
1784 | local_irq_enable(); | |
1785 | ||
1786 | while (clist) { | |
1787 | struct sk_buff *skb = clist; | |
1788 | clist = clist->next; | |
1789 | ||
1790 | BUG_TRAP(!atomic_read(&skb->users)); | |
1791 | __kfree_skb(skb); | |
1792 | } | |
1793 | } | |
1794 | ||
1795 | if (sd->output_queue) { | |
1796 | struct net_device *head; | |
1797 | ||
1798 | local_irq_disable(); | |
1799 | head = sd->output_queue; | |
1800 | sd->output_queue = NULL; | |
1801 | local_irq_enable(); | |
1802 | ||
1803 | while (head) { | |
1804 | struct net_device *dev = head; | |
1805 | head = head->next_sched; | |
1806 | ||
1807 | smp_mb__before_clear_bit(); | |
1808 | clear_bit(__LINK_STATE_SCHED, &dev->state); | |
1809 | ||
1810 | if (spin_trylock(&dev->queue_lock)) { | |
1811 | qdisc_run(dev); | |
1812 | spin_unlock(&dev->queue_lock); | |
1813 | } else { | |
1814 | netif_schedule(dev); | |
1815 | } | |
1816 | } | |
1817 | } | |
1818 | } | |
1819 | ||
6f05f629 SH |
1820 | static inline int deliver_skb(struct sk_buff *skb, |
1821 | struct packet_type *pt_prev, | |
1822 | struct net_device *orig_dev) | |
1da177e4 LT |
1823 | { |
1824 | atomic_inc(&skb->users); | |
f2ccd8fa | 1825 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
1da177e4 LT |
1826 | } |
1827 | ||
1828 | #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE) | |
6229e362 | 1829 | /* These hooks defined here for ATM */ |
1da177e4 LT |
1830 | struct net_bridge; |
1831 | struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br, | |
1832 | unsigned char *addr); | |
6229e362 | 1833 | void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly; |
1da177e4 | 1834 | |
6229e362 SH |
1835 | /* |
1836 | * If bridge module is loaded call bridging hook. | |
1837 | * returns NULL if packet was consumed. | |
1838 | */ | |
1839 | struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p, | |
1840 | struct sk_buff *skb) __read_mostly; | |
1841 | static inline struct sk_buff *handle_bridge(struct sk_buff *skb, | |
1842 | struct packet_type **pt_prev, int *ret, | |
1843 | struct net_device *orig_dev) | |
1da177e4 LT |
1844 | { |
1845 | struct net_bridge_port *port; | |
1846 | ||
6229e362 SH |
1847 | if (skb->pkt_type == PACKET_LOOPBACK || |
1848 | (port = rcu_dereference(skb->dev->br_port)) == NULL) | |
1849 | return skb; | |
1da177e4 LT |
1850 | |
1851 | if (*pt_prev) { | |
6229e362 | 1852 | *ret = deliver_skb(skb, *pt_prev, orig_dev); |
1da177e4 | 1853 | *pt_prev = NULL; |
4ec93edb YH |
1854 | } |
1855 | ||
6229e362 | 1856 | return br_handle_frame_hook(port, skb); |
1da177e4 LT |
1857 | } |
1858 | #else | |
6229e362 | 1859 | #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb) |
1da177e4 LT |
1860 | #endif |
1861 | ||
b863ceb7 PM |
1862 | #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE) |
1863 | struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly; | |
1864 | EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook); | |
1865 | ||
1866 | static inline struct sk_buff *handle_macvlan(struct sk_buff *skb, | |
1867 | struct packet_type **pt_prev, | |
1868 | int *ret, | |
1869 | struct net_device *orig_dev) | |
1870 | { | |
1871 | if (skb->dev->macvlan_port == NULL) | |
1872 | return skb; | |
1873 | ||
1874 | if (*pt_prev) { | |
1875 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
1876 | *pt_prev = NULL; | |
1877 | } | |
1878 | return macvlan_handle_frame_hook(skb); | |
1879 | } | |
1880 | #else | |
1881 | #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb) | |
1882 | #endif | |
1883 | ||
1da177e4 LT |
1884 | #ifdef CONFIG_NET_CLS_ACT |
1885 | /* TODO: Maybe we should just force sch_ingress to be compiled in | |
1886 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions | |
1887 | * a compare and 2 stores extra right now if we dont have it on | |
1888 | * but have CONFIG_NET_CLS_ACT | |
4ec93edb | 1889 | * NOTE: This doesnt stop any functionality; if you dont have |
1da177e4 LT |
1890 | * the ingress scheduler, you just cant add policies on ingress. |
1891 | * | |
1892 | */ | |
4ec93edb | 1893 | static int ing_filter(struct sk_buff *skb) |
1da177e4 LT |
1894 | { |
1895 | struct Qdisc *q; | |
1896 | struct net_device *dev = skb->dev; | |
1897 | int result = TC_ACT_OK; | |
4ec93edb | 1898 | |
1da177e4 LT |
1899 | if (dev->qdisc_ingress) { |
1900 | __u32 ttl = (__u32) G_TC_RTTL(skb->tc_verd); | |
1901 | if (MAX_RED_LOOP < ttl++) { | |
c01003c2 PM |
1902 | printk(KERN_WARNING "Redir loop detected Dropping packet (%d->%d)\n", |
1903 | skb->iif, skb->dev->ifindex); | |
1da177e4 LT |
1904 | return TC_ACT_SHOT; |
1905 | } | |
1906 | ||
1907 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd,ttl); | |
1908 | ||
1909 | skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_INGRESS); | |
86e65da9 | 1910 | |
fd44de7c | 1911 | spin_lock(&dev->ingress_lock); |
1da177e4 LT |
1912 | if ((q = dev->qdisc_ingress) != NULL) |
1913 | result = q->enqueue(skb, q); | |
fd44de7c | 1914 | spin_unlock(&dev->ingress_lock); |
1da177e4 LT |
1915 | |
1916 | } | |
1917 | ||
1918 | return result; | |
1919 | } | |
1920 | #endif | |
1921 | ||
1922 | int netif_receive_skb(struct sk_buff *skb) | |
1923 | { | |
1924 | struct packet_type *ptype, *pt_prev; | |
f2ccd8fa | 1925 | struct net_device *orig_dev; |
1da177e4 | 1926 | int ret = NET_RX_DROP; |
252e3346 | 1927 | __be16 type; |
1da177e4 LT |
1928 | |
1929 | /* if we've gotten here through NAPI, check netpoll */ | |
1930 | if (skb->dev->poll && netpoll_rx(skb)) | |
1931 | return NET_RX_DROP; | |
1932 | ||
b7aa0bf7 | 1933 | if (!skb->tstamp.tv64) |
a61bbcf2 | 1934 | net_timestamp(skb); |
1da177e4 | 1935 | |
c01003c2 PM |
1936 | if (!skb->iif) |
1937 | skb->iif = skb->dev->ifindex; | |
86e65da9 | 1938 | |
f2ccd8fa | 1939 | orig_dev = skb_bond(skb); |
1da177e4 | 1940 | |
8f903c70 JV |
1941 | if (!orig_dev) |
1942 | return NET_RX_DROP; | |
1943 | ||
1da177e4 LT |
1944 | __get_cpu_var(netdev_rx_stat).total++; |
1945 | ||
c1d2bbe1 | 1946 | skb_reset_network_header(skb); |
badff6d0 | 1947 | skb_reset_transport_header(skb); |
b0e380b1 | 1948 | skb->mac_len = skb->network_header - skb->mac_header; |
1da177e4 LT |
1949 | |
1950 | pt_prev = NULL; | |
1951 | ||
1952 | rcu_read_lock(); | |
1953 | ||
1954 | #ifdef CONFIG_NET_CLS_ACT | |
1955 | if (skb->tc_verd & TC_NCLS) { | |
1956 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
1957 | goto ncls; | |
1958 | } | |
1959 | #endif | |
1960 | ||
1961 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
1962 | if (!ptype->dev || ptype->dev == skb->dev) { | |
4ec93edb | 1963 | if (pt_prev) |
f2ccd8fa | 1964 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
1965 | pt_prev = ptype; |
1966 | } | |
1967 | } | |
1968 | ||
1969 | #ifdef CONFIG_NET_CLS_ACT | |
1970 | if (pt_prev) { | |
f2ccd8fa | 1971 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
1972 | pt_prev = NULL; /* noone else should process this after*/ |
1973 | } else { | |
1974 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
1975 | } | |
1976 | ||
1977 | ret = ing_filter(skb); | |
1978 | ||
1979 | if (ret == TC_ACT_SHOT || (ret == TC_ACT_STOLEN)) { | |
1980 | kfree_skb(skb); | |
1981 | goto out; | |
1982 | } | |
1983 | ||
1984 | skb->tc_verd = 0; | |
1985 | ncls: | |
1986 | #endif | |
1987 | ||
6229e362 | 1988 | skb = handle_bridge(skb, &pt_prev, &ret, orig_dev); |
b863ceb7 PM |
1989 | if (!skb) |
1990 | goto out; | |
1991 | skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev); | |
6229e362 | 1992 | if (!skb) |
1da177e4 LT |
1993 | goto out; |
1994 | ||
1995 | type = skb->protocol; | |
1996 | list_for_each_entry_rcu(ptype, &ptype_base[ntohs(type)&15], list) { | |
1997 | if (ptype->type == type && | |
1998 | (!ptype->dev || ptype->dev == skb->dev)) { | |
4ec93edb | 1999 | if (pt_prev) |
f2ccd8fa | 2000 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
2001 | pt_prev = ptype; |
2002 | } | |
2003 | } | |
2004 | ||
2005 | if (pt_prev) { | |
f2ccd8fa | 2006 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
1da177e4 LT |
2007 | } else { |
2008 | kfree_skb(skb); | |
2009 | /* Jamal, now you will not able to escape explaining | |
2010 | * me how you were going to use this. :-) | |
2011 | */ | |
2012 | ret = NET_RX_DROP; | |
2013 | } | |
2014 | ||
2015 | out: | |
2016 | rcu_read_unlock(); | |
2017 | return ret; | |
2018 | } | |
2019 | ||
2020 | static int process_backlog(struct net_device *backlog_dev, int *budget) | |
2021 | { | |
2022 | int work = 0; | |
2023 | int quota = min(backlog_dev->quota, *budget); | |
2024 | struct softnet_data *queue = &__get_cpu_var(softnet_data); | |
2025 | unsigned long start_time = jiffies; | |
2026 | ||
e3876605 | 2027 | backlog_dev->weight = weight_p; |
1da177e4 LT |
2028 | for (;;) { |
2029 | struct sk_buff *skb; | |
2030 | struct net_device *dev; | |
2031 | ||
2032 | local_irq_disable(); | |
2033 | skb = __skb_dequeue(&queue->input_pkt_queue); | |
2034 | if (!skb) | |
2035 | goto job_done; | |
2036 | local_irq_enable(); | |
2037 | ||
2038 | dev = skb->dev; | |
2039 | ||
2040 | netif_receive_skb(skb); | |
2041 | ||
2042 | dev_put(dev); | |
2043 | ||
2044 | work++; | |
2045 | ||
2046 | if (work >= quota || jiffies - start_time > 1) | |
2047 | break; | |
2048 | ||
2049 | } | |
2050 | ||
2051 | backlog_dev->quota -= work; | |
2052 | *budget -= work; | |
2053 | return -1; | |
2054 | ||
2055 | job_done: | |
2056 | backlog_dev->quota -= work; | |
2057 | *budget -= work; | |
2058 | ||
2059 | list_del(&backlog_dev->poll_list); | |
2060 | smp_mb__before_clear_bit(); | |
2061 | netif_poll_enable(backlog_dev); | |
2062 | ||
1da177e4 LT |
2063 | local_irq_enable(); |
2064 | return 0; | |
2065 | } | |
2066 | ||
2067 | static void net_rx_action(struct softirq_action *h) | |
2068 | { | |
2069 | struct softnet_data *queue = &__get_cpu_var(softnet_data); | |
2070 | unsigned long start_time = jiffies; | |
51b0bded | 2071 | int budget = netdev_budget; |
53fb95d3 MM |
2072 | void *have; |
2073 | ||
1da177e4 LT |
2074 | local_irq_disable(); |
2075 | ||
2076 | while (!list_empty(&queue->poll_list)) { | |
2077 | struct net_device *dev; | |
2078 | ||
2079 | if (budget <= 0 || jiffies - start_time > 1) | |
2080 | goto softnet_break; | |
2081 | ||
2082 | local_irq_enable(); | |
2083 | ||
2084 | dev = list_entry(queue->poll_list.next, | |
2085 | struct net_device, poll_list); | |
53fb95d3 | 2086 | have = netpoll_poll_lock(dev); |
1da177e4 LT |
2087 | |
2088 | if (dev->quota <= 0 || dev->poll(dev, &budget)) { | |
53fb95d3 | 2089 | netpoll_poll_unlock(have); |
1da177e4 | 2090 | local_irq_disable(); |
8aca8a27 | 2091 | list_move_tail(&dev->poll_list, &queue->poll_list); |
1da177e4 LT |
2092 | if (dev->quota < 0) |
2093 | dev->quota += dev->weight; | |
2094 | else | |
2095 | dev->quota = dev->weight; | |
2096 | } else { | |
53fb95d3 | 2097 | netpoll_poll_unlock(have); |
1da177e4 LT |
2098 | dev_put(dev); |
2099 | local_irq_disable(); | |
2100 | } | |
2101 | } | |
2102 | out: | |
515e06c4 | 2103 | local_irq_enable(); |
db217334 CL |
2104 | #ifdef CONFIG_NET_DMA |
2105 | /* | |
2106 | * There may not be any more sk_buffs coming right now, so push | |
2107 | * any pending DMA copies to hardware | |
2108 | */ | |
d379b01e DW |
2109 | if (!cpus_empty(net_dma.channel_mask)) { |
2110 | int chan_idx; | |
2111 | for_each_cpu_mask(chan_idx, net_dma.channel_mask) { | |
2112 | struct dma_chan *chan = net_dma.channels[chan_idx]; | |
2113 | if (chan) | |
2114 | dma_async_memcpy_issue_pending(chan); | |
2115 | } | |
db217334 CL |
2116 | } |
2117 | #endif | |
1da177e4 LT |
2118 | return; |
2119 | ||
2120 | softnet_break: | |
2121 | __get_cpu_var(netdev_rx_stat).time_squeeze++; | |
2122 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
2123 | goto out; | |
2124 | } | |
2125 | ||
2126 | static gifconf_func_t * gifconf_list [NPROTO]; | |
2127 | ||
2128 | /** | |
2129 | * register_gifconf - register a SIOCGIF handler | |
2130 | * @family: Address family | |
2131 | * @gifconf: Function handler | |
2132 | * | |
2133 | * Register protocol dependent address dumping routines. The handler | |
2134 | * that is passed must not be freed or reused until it has been replaced | |
2135 | * by another handler. | |
2136 | */ | |
2137 | int register_gifconf(unsigned int family, gifconf_func_t * gifconf) | |
2138 | { | |
2139 | if (family >= NPROTO) | |
2140 | return -EINVAL; | |
2141 | gifconf_list[family] = gifconf; | |
2142 | return 0; | |
2143 | } | |
2144 | ||
2145 | ||
2146 | /* | |
2147 | * Map an interface index to its name (SIOCGIFNAME) | |
2148 | */ | |
2149 | ||
2150 | /* | |
2151 | * We need this ioctl for efficient implementation of the | |
2152 | * if_indextoname() function required by the IPv6 API. Without | |
2153 | * it, we would have to search all the interfaces to find a | |
2154 | * match. --pb | |
2155 | */ | |
2156 | ||
2157 | static int dev_ifname(struct ifreq __user *arg) | |
2158 | { | |
2159 | struct net_device *dev; | |
2160 | struct ifreq ifr; | |
2161 | ||
2162 | /* | |
2163 | * Fetch the caller's info block. | |
2164 | */ | |
2165 | ||
2166 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
2167 | return -EFAULT; | |
2168 | ||
2169 | read_lock(&dev_base_lock); | |
2170 | dev = __dev_get_by_index(ifr.ifr_ifindex); | |
2171 | if (!dev) { | |
2172 | read_unlock(&dev_base_lock); | |
2173 | return -ENODEV; | |
2174 | } | |
2175 | ||
2176 | strcpy(ifr.ifr_name, dev->name); | |
2177 | read_unlock(&dev_base_lock); | |
2178 | ||
2179 | if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) | |
2180 | return -EFAULT; | |
2181 | return 0; | |
2182 | } | |
2183 | ||
2184 | /* | |
2185 | * Perform a SIOCGIFCONF call. This structure will change | |
2186 | * size eventually, and there is nothing I can do about it. | |
2187 | * Thus we will need a 'compatibility mode'. | |
2188 | */ | |
2189 | ||
2190 | static int dev_ifconf(char __user *arg) | |
2191 | { | |
2192 | struct ifconf ifc; | |
2193 | struct net_device *dev; | |
2194 | char __user *pos; | |
2195 | int len; | |
2196 | int total; | |
2197 | int i; | |
2198 | ||
2199 | /* | |
2200 | * Fetch the caller's info block. | |
2201 | */ | |
2202 | ||
2203 | if (copy_from_user(&ifc, arg, sizeof(struct ifconf))) | |
2204 | return -EFAULT; | |
2205 | ||
2206 | pos = ifc.ifc_buf; | |
2207 | len = ifc.ifc_len; | |
2208 | ||
2209 | /* | |
2210 | * Loop over the interfaces, and write an info block for each. | |
2211 | */ | |
2212 | ||
2213 | total = 0; | |
7562f876 | 2214 | for_each_netdev(dev) { |
1da177e4 LT |
2215 | for (i = 0; i < NPROTO; i++) { |
2216 | if (gifconf_list[i]) { | |
2217 | int done; | |
2218 | if (!pos) | |
2219 | done = gifconf_list[i](dev, NULL, 0); | |
2220 | else | |
2221 | done = gifconf_list[i](dev, pos + total, | |
2222 | len - total); | |
2223 | if (done < 0) | |
2224 | return -EFAULT; | |
2225 | total += done; | |
2226 | } | |
2227 | } | |
4ec93edb | 2228 | } |
1da177e4 LT |
2229 | |
2230 | /* | |
2231 | * All done. Write the updated control block back to the caller. | |
2232 | */ | |
2233 | ifc.ifc_len = total; | |
2234 | ||
2235 | /* | |
2236 | * Both BSD and Solaris return 0 here, so we do too. | |
2237 | */ | |
2238 | return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0; | |
2239 | } | |
2240 | ||
2241 | #ifdef CONFIG_PROC_FS | |
2242 | /* | |
2243 | * This is invoked by the /proc filesystem handler to display a device | |
2244 | * in detail. | |
2245 | */ | |
7562f876 | 2246 | void *dev_seq_start(struct seq_file *seq, loff_t *pos) |
1da177e4 | 2247 | { |
7562f876 | 2248 | loff_t off; |
1da177e4 | 2249 | struct net_device *dev; |
1da177e4 | 2250 | |
7562f876 PE |
2251 | read_lock(&dev_base_lock); |
2252 | if (!*pos) | |
2253 | return SEQ_START_TOKEN; | |
1da177e4 | 2254 | |
7562f876 PE |
2255 | off = 1; |
2256 | for_each_netdev(dev) | |
2257 | if (off++ == *pos) | |
2258 | return dev; | |
1da177e4 | 2259 | |
7562f876 | 2260 | return NULL; |
1da177e4 LT |
2261 | } |
2262 | ||
2263 | void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2264 | { | |
2265 | ++*pos; | |
7562f876 PE |
2266 | return v == SEQ_START_TOKEN ? |
2267 | first_net_device() : next_net_device((struct net_device *)v); | |
1da177e4 LT |
2268 | } |
2269 | ||
2270 | void dev_seq_stop(struct seq_file *seq, void *v) | |
2271 | { | |
2272 | read_unlock(&dev_base_lock); | |
2273 | } | |
2274 | ||
2275 | static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) | |
2276 | { | |
c45d286e | 2277 | struct net_device_stats *stats = dev->get_stats(dev); |
1da177e4 | 2278 | |
5a1b5898 RR |
2279 | seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu " |
2280 | "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n", | |
2281 | dev->name, stats->rx_bytes, stats->rx_packets, | |
2282 | stats->rx_errors, | |
2283 | stats->rx_dropped + stats->rx_missed_errors, | |
2284 | stats->rx_fifo_errors, | |
2285 | stats->rx_length_errors + stats->rx_over_errors + | |
2286 | stats->rx_crc_errors + stats->rx_frame_errors, | |
2287 | stats->rx_compressed, stats->multicast, | |
2288 | stats->tx_bytes, stats->tx_packets, | |
2289 | stats->tx_errors, stats->tx_dropped, | |
2290 | stats->tx_fifo_errors, stats->collisions, | |
2291 | stats->tx_carrier_errors + | |
2292 | stats->tx_aborted_errors + | |
2293 | stats->tx_window_errors + | |
2294 | stats->tx_heartbeat_errors, | |
2295 | stats->tx_compressed); | |
1da177e4 LT |
2296 | } |
2297 | ||
2298 | /* | |
2299 | * Called from the PROCfs module. This now uses the new arbitrary sized | |
2300 | * /proc/net interface to create /proc/net/dev | |
2301 | */ | |
2302 | static int dev_seq_show(struct seq_file *seq, void *v) | |
2303 | { | |
2304 | if (v == SEQ_START_TOKEN) | |
2305 | seq_puts(seq, "Inter-| Receive " | |
2306 | " | Transmit\n" | |
2307 | " face |bytes packets errs drop fifo frame " | |
2308 | "compressed multicast|bytes packets errs " | |
2309 | "drop fifo colls carrier compressed\n"); | |
2310 | else | |
2311 | dev_seq_printf_stats(seq, v); | |
2312 | return 0; | |
2313 | } | |
2314 | ||
2315 | static struct netif_rx_stats *softnet_get_online(loff_t *pos) | |
2316 | { | |
2317 | struct netif_rx_stats *rc = NULL; | |
2318 | ||
2319 | while (*pos < NR_CPUS) | |
4ec93edb | 2320 | if (cpu_online(*pos)) { |
1da177e4 LT |
2321 | rc = &per_cpu(netdev_rx_stat, *pos); |
2322 | break; | |
2323 | } else | |
2324 | ++*pos; | |
2325 | return rc; | |
2326 | } | |
2327 | ||
2328 | static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) | |
2329 | { | |
2330 | return softnet_get_online(pos); | |
2331 | } | |
2332 | ||
2333 | static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2334 | { | |
2335 | ++*pos; | |
2336 | return softnet_get_online(pos); | |
2337 | } | |
2338 | ||
2339 | static void softnet_seq_stop(struct seq_file *seq, void *v) | |
2340 | { | |
2341 | } | |
2342 | ||
2343 | static int softnet_seq_show(struct seq_file *seq, void *v) | |
2344 | { | |
2345 | struct netif_rx_stats *s = v; | |
2346 | ||
2347 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n", | |
31aa02c5 | 2348 | s->total, s->dropped, s->time_squeeze, 0, |
c1ebcdb8 SH |
2349 | 0, 0, 0, 0, /* was fastroute */ |
2350 | s->cpu_collision ); | |
1da177e4 LT |
2351 | return 0; |
2352 | } | |
2353 | ||
f690808e | 2354 | static const struct seq_operations dev_seq_ops = { |
1da177e4 LT |
2355 | .start = dev_seq_start, |
2356 | .next = dev_seq_next, | |
2357 | .stop = dev_seq_stop, | |
2358 | .show = dev_seq_show, | |
2359 | }; | |
2360 | ||
2361 | static int dev_seq_open(struct inode *inode, struct file *file) | |
2362 | { | |
2363 | return seq_open(file, &dev_seq_ops); | |
2364 | } | |
2365 | ||
9a32144e | 2366 | static const struct file_operations dev_seq_fops = { |
1da177e4 LT |
2367 | .owner = THIS_MODULE, |
2368 | .open = dev_seq_open, | |
2369 | .read = seq_read, | |
2370 | .llseek = seq_lseek, | |
2371 | .release = seq_release, | |
2372 | }; | |
2373 | ||
f690808e | 2374 | static const struct seq_operations softnet_seq_ops = { |
1da177e4 LT |
2375 | .start = softnet_seq_start, |
2376 | .next = softnet_seq_next, | |
2377 | .stop = softnet_seq_stop, | |
2378 | .show = softnet_seq_show, | |
2379 | }; | |
2380 | ||
2381 | static int softnet_seq_open(struct inode *inode, struct file *file) | |
2382 | { | |
2383 | return seq_open(file, &softnet_seq_ops); | |
2384 | } | |
2385 | ||
9a32144e | 2386 | static const struct file_operations softnet_seq_fops = { |
1da177e4 LT |
2387 | .owner = THIS_MODULE, |
2388 | .open = softnet_seq_open, | |
2389 | .read = seq_read, | |
2390 | .llseek = seq_lseek, | |
2391 | .release = seq_release, | |
2392 | }; | |
2393 | ||
0e1256ff SH |
2394 | static void *ptype_get_idx(loff_t pos) |
2395 | { | |
2396 | struct packet_type *pt = NULL; | |
2397 | loff_t i = 0; | |
2398 | int t; | |
2399 | ||
2400 | list_for_each_entry_rcu(pt, &ptype_all, list) { | |
2401 | if (i == pos) | |
2402 | return pt; | |
2403 | ++i; | |
2404 | } | |
2405 | ||
2406 | for (t = 0; t < 16; t++) { | |
2407 | list_for_each_entry_rcu(pt, &ptype_base[t], list) { | |
2408 | if (i == pos) | |
2409 | return pt; | |
2410 | ++i; | |
2411 | } | |
2412 | } | |
2413 | return NULL; | |
2414 | } | |
2415 | ||
2416 | static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) | |
2417 | { | |
2418 | rcu_read_lock(); | |
2419 | return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN; | |
2420 | } | |
2421 | ||
2422 | static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2423 | { | |
2424 | struct packet_type *pt; | |
2425 | struct list_head *nxt; | |
2426 | int hash; | |
2427 | ||
2428 | ++*pos; | |
2429 | if (v == SEQ_START_TOKEN) | |
2430 | return ptype_get_idx(0); | |
2431 | ||
2432 | pt = v; | |
2433 | nxt = pt->list.next; | |
2434 | if (pt->type == htons(ETH_P_ALL)) { | |
2435 | if (nxt != &ptype_all) | |
2436 | goto found; | |
2437 | hash = 0; | |
2438 | nxt = ptype_base[0].next; | |
2439 | } else | |
2440 | hash = ntohs(pt->type) & 15; | |
2441 | ||
2442 | while (nxt == &ptype_base[hash]) { | |
2443 | if (++hash >= 16) | |
2444 | return NULL; | |
2445 | nxt = ptype_base[hash].next; | |
2446 | } | |
2447 | found: | |
2448 | return list_entry(nxt, struct packet_type, list); | |
2449 | } | |
2450 | ||
2451 | static void ptype_seq_stop(struct seq_file *seq, void *v) | |
2452 | { | |
2453 | rcu_read_unlock(); | |
2454 | } | |
2455 | ||
2456 | static void ptype_seq_decode(struct seq_file *seq, void *sym) | |
2457 | { | |
2458 | #ifdef CONFIG_KALLSYMS | |
2459 | unsigned long offset = 0, symsize; | |
2460 | const char *symname; | |
2461 | char *modname; | |
2462 | char namebuf[128]; | |
2463 | ||
2464 | symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset, | |
2465 | &modname, namebuf); | |
2466 | ||
2467 | if (symname) { | |
2468 | char *delim = ":"; | |
2469 | ||
2470 | if (!modname) | |
2471 | modname = delim = ""; | |
2472 | seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim, | |
2473 | symname, offset); | |
2474 | return; | |
2475 | } | |
2476 | #endif | |
2477 | ||
2478 | seq_printf(seq, "[%p]", sym); | |
2479 | } | |
2480 | ||
2481 | static int ptype_seq_show(struct seq_file *seq, void *v) | |
2482 | { | |
2483 | struct packet_type *pt = v; | |
2484 | ||
2485 | if (v == SEQ_START_TOKEN) | |
2486 | seq_puts(seq, "Type Device Function\n"); | |
2487 | else { | |
2488 | if (pt->type == htons(ETH_P_ALL)) | |
2489 | seq_puts(seq, "ALL "); | |
2490 | else | |
2491 | seq_printf(seq, "%04x", ntohs(pt->type)); | |
2492 | ||
2493 | seq_printf(seq, " %-8s ", | |
2494 | pt->dev ? pt->dev->name : ""); | |
2495 | ptype_seq_decode(seq, pt->func); | |
2496 | seq_putc(seq, '\n'); | |
2497 | } | |
2498 | ||
2499 | return 0; | |
2500 | } | |
2501 | ||
2502 | static const struct seq_operations ptype_seq_ops = { | |
2503 | .start = ptype_seq_start, | |
2504 | .next = ptype_seq_next, | |
2505 | .stop = ptype_seq_stop, | |
2506 | .show = ptype_seq_show, | |
2507 | }; | |
2508 | ||
2509 | static int ptype_seq_open(struct inode *inode, struct file *file) | |
2510 | { | |
2511 | return seq_open(file, &ptype_seq_ops); | |
2512 | } | |
2513 | ||
2514 | static const struct file_operations ptype_seq_fops = { | |
2515 | .owner = THIS_MODULE, | |
2516 | .open = ptype_seq_open, | |
2517 | .read = seq_read, | |
2518 | .llseek = seq_lseek, | |
2519 | .release = seq_release, | |
2520 | }; | |
2521 | ||
2522 | ||
1da177e4 LT |
2523 | static int __init dev_proc_init(void) |
2524 | { | |
2525 | int rc = -ENOMEM; | |
2526 | ||
2527 | if (!proc_net_fops_create("dev", S_IRUGO, &dev_seq_fops)) | |
2528 | goto out; | |
2529 | if (!proc_net_fops_create("softnet_stat", S_IRUGO, &softnet_seq_fops)) | |
2530 | goto out_dev; | |
0e1256ff SH |
2531 | if (!proc_net_fops_create("ptype", S_IRUGO, &ptype_seq_fops)) |
2532 | goto out_dev2; | |
2533 | ||
295f4a1f | 2534 | if (wext_proc_init()) |
1da177e4 LT |
2535 | goto out_softnet; |
2536 | rc = 0; | |
2537 | out: | |
2538 | return rc; | |
2539 | out_softnet: | |
0e1256ff | 2540 | proc_net_remove("ptype"); |
2396a22e JJS |
2541 | out_dev2: |
2542 | proc_net_remove("softnet_stat"); | |
1da177e4 LT |
2543 | out_dev: |
2544 | proc_net_remove("dev"); | |
2545 | goto out; | |
2546 | } | |
2547 | #else | |
2548 | #define dev_proc_init() 0 | |
2549 | #endif /* CONFIG_PROC_FS */ | |
2550 | ||
2551 | ||
2552 | /** | |
2553 | * netdev_set_master - set up master/slave pair | |
2554 | * @slave: slave device | |
2555 | * @master: new master device | |
2556 | * | |
2557 | * Changes the master device of the slave. Pass %NULL to break the | |
2558 | * bonding. The caller must hold the RTNL semaphore. On a failure | |
2559 | * a negative errno code is returned. On success the reference counts | |
2560 | * are adjusted, %RTM_NEWLINK is sent to the routing socket and the | |
2561 | * function returns zero. | |
2562 | */ | |
2563 | int netdev_set_master(struct net_device *slave, struct net_device *master) | |
2564 | { | |
2565 | struct net_device *old = slave->master; | |
2566 | ||
2567 | ASSERT_RTNL(); | |
2568 | ||
2569 | if (master) { | |
2570 | if (old) | |
2571 | return -EBUSY; | |
2572 | dev_hold(master); | |
2573 | } | |
2574 | ||
2575 | slave->master = master; | |
4ec93edb | 2576 | |
1da177e4 LT |
2577 | synchronize_net(); |
2578 | ||
2579 | if (old) | |
2580 | dev_put(old); | |
2581 | ||
2582 | if (master) | |
2583 | slave->flags |= IFF_SLAVE; | |
2584 | else | |
2585 | slave->flags &= ~IFF_SLAVE; | |
2586 | ||
2587 | rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE); | |
2588 | return 0; | |
2589 | } | |
2590 | ||
4417da66 | 2591 | static void __dev_set_promiscuity(struct net_device *dev, int inc) |
1da177e4 LT |
2592 | { |
2593 | unsigned short old_flags = dev->flags; | |
2594 | ||
24023451 PM |
2595 | ASSERT_RTNL(); |
2596 | ||
1da177e4 LT |
2597 | if ((dev->promiscuity += inc) == 0) |
2598 | dev->flags &= ~IFF_PROMISC; | |
52609c0b DC |
2599 | else |
2600 | dev->flags |= IFF_PROMISC; | |
2601 | if (dev->flags != old_flags) { | |
1da177e4 LT |
2602 | printk(KERN_INFO "device %s %s promiscuous mode\n", |
2603 | dev->name, (dev->flags & IFF_PROMISC) ? "entered" : | |
4ec93edb | 2604 | "left"); |
5bdb9886 SG |
2605 | audit_log(current->audit_context, GFP_ATOMIC, |
2606 | AUDIT_ANOM_PROMISCUOUS, | |
2607 | "dev=%s prom=%d old_prom=%d auid=%u", | |
2608 | dev->name, (dev->flags & IFF_PROMISC), | |
2609 | (old_flags & IFF_PROMISC), | |
4ec93edb | 2610 | audit_get_loginuid(current->audit_context)); |
24023451 PM |
2611 | |
2612 | if (dev->change_rx_flags) | |
2613 | dev->change_rx_flags(dev, IFF_PROMISC); | |
1da177e4 LT |
2614 | } |
2615 | } | |
2616 | ||
4417da66 PM |
2617 | /** |
2618 | * dev_set_promiscuity - update promiscuity count on a device | |
2619 | * @dev: device | |
2620 | * @inc: modifier | |
2621 | * | |
2622 | * Add or remove promiscuity from a device. While the count in the device | |
2623 | * remains above zero the interface remains promiscuous. Once it hits zero | |
2624 | * the device reverts back to normal filtering operation. A negative inc | |
2625 | * value is used to drop promiscuity on the device. | |
2626 | */ | |
2627 | void dev_set_promiscuity(struct net_device *dev, int inc) | |
2628 | { | |
2629 | unsigned short old_flags = dev->flags; | |
2630 | ||
2631 | __dev_set_promiscuity(dev, inc); | |
2632 | if (dev->flags != old_flags) | |
2633 | dev_set_rx_mode(dev); | |
2634 | } | |
2635 | ||
1da177e4 LT |
2636 | /** |
2637 | * dev_set_allmulti - update allmulti count on a device | |
2638 | * @dev: device | |
2639 | * @inc: modifier | |
2640 | * | |
2641 | * Add or remove reception of all multicast frames to a device. While the | |
2642 | * count in the device remains above zero the interface remains listening | |
2643 | * to all interfaces. Once it hits zero the device reverts back to normal | |
2644 | * filtering operation. A negative @inc value is used to drop the counter | |
2645 | * when releasing a resource needing all multicasts. | |
2646 | */ | |
2647 | ||
2648 | void dev_set_allmulti(struct net_device *dev, int inc) | |
2649 | { | |
2650 | unsigned short old_flags = dev->flags; | |
2651 | ||
24023451 PM |
2652 | ASSERT_RTNL(); |
2653 | ||
1da177e4 LT |
2654 | dev->flags |= IFF_ALLMULTI; |
2655 | if ((dev->allmulti += inc) == 0) | |
2656 | dev->flags &= ~IFF_ALLMULTI; | |
24023451 PM |
2657 | if (dev->flags ^ old_flags) { |
2658 | if (dev->change_rx_flags) | |
2659 | dev->change_rx_flags(dev, IFF_ALLMULTI); | |
4417da66 | 2660 | dev_set_rx_mode(dev); |
24023451 | 2661 | } |
4417da66 PM |
2662 | } |
2663 | ||
2664 | /* | |
2665 | * Upload unicast and multicast address lists to device and | |
2666 | * configure RX filtering. When the device doesn't support unicast | |
2667 | * filtering it is put in promiscous mode while unicast addresses | |
2668 | * are present. | |
2669 | */ | |
2670 | void __dev_set_rx_mode(struct net_device *dev) | |
2671 | { | |
2672 | /* dev_open will call this function so the list will stay sane. */ | |
2673 | if (!(dev->flags&IFF_UP)) | |
2674 | return; | |
2675 | ||
2676 | if (!netif_device_present(dev)) | |
40b77c94 | 2677 | return; |
4417da66 PM |
2678 | |
2679 | if (dev->set_rx_mode) | |
2680 | dev->set_rx_mode(dev); | |
2681 | else { | |
2682 | /* Unicast addresses changes may only happen under the rtnl, | |
2683 | * therefore calling __dev_set_promiscuity here is safe. | |
2684 | */ | |
2685 | if (dev->uc_count > 0 && !dev->uc_promisc) { | |
2686 | __dev_set_promiscuity(dev, 1); | |
2687 | dev->uc_promisc = 1; | |
2688 | } else if (dev->uc_count == 0 && dev->uc_promisc) { | |
2689 | __dev_set_promiscuity(dev, -1); | |
2690 | dev->uc_promisc = 0; | |
2691 | } | |
2692 | ||
2693 | if (dev->set_multicast_list) | |
2694 | dev->set_multicast_list(dev); | |
2695 | } | |
2696 | } | |
2697 | ||
2698 | void dev_set_rx_mode(struct net_device *dev) | |
2699 | { | |
2700 | netif_tx_lock_bh(dev); | |
2701 | __dev_set_rx_mode(dev); | |
2702 | netif_tx_unlock_bh(dev); | |
1da177e4 LT |
2703 | } |
2704 | ||
61cbc2fc PM |
2705 | int __dev_addr_delete(struct dev_addr_list **list, int *count, |
2706 | void *addr, int alen, int glbl) | |
bf742482 PM |
2707 | { |
2708 | struct dev_addr_list *da; | |
2709 | ||
2710 | for (; (da = *list) != NULL; list = &da->next) { | |
2711 | if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 && | |
2712 | alen == da->da_addrlen) { | |
2713 | if (glbl) { | |
2714 | int old_glbl = da->da_gusers; | |
2715 | da->da_gusers = 0; | |
2716 | if (old_glbl == 0) | |
2717 | break; | |
2718 | } | |
2719 | if (--da->da_users) | |
2720 | return 0; | |
2721 | ||
2722 | *list = da->next; | |
2723 | kfree(da); | |
61cbc2fc | 2724 | (*count)--; |
bf742482 PM |
2725 | return 0; |
2726 | } | |
2727 | } | |
2728 | return -ENOENT; | |
2729 | } | |
2730 | ||
61cbc2fc PM |
2731 | int __dev_addr_add(struct dev_addr_list **list, int *count, |
2732 | void *addr, int alen, int glbl) | |
bf742482 PM |
2733 | { |
2734 | struct dev_addr_list *da; | |
2735 | ||
2736 | for (da = *list; da != NULL; da = da->next) { | |
2737 | if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 && | |
2738 | da->da_addrlen == alen) { | |
2739 | if (glbl) { | |
2740 | int old_glbl = da->da_gusers; | |
2741 | da->da_gusers = 1; | |
2742 | if (old_glbl) | |
2743 | return 0; | |
2744 | } | |
2745 | da->da_users++; | |
2746 | return 0; | |
2747 | } | |
2748 | } | |
2749 | ||
2750 | da = kmalloc(sizeof(*da), GFP_ATOMIC); | |
2751 | if (da == NULL) | |
2752 | return -ENOMEM; | |
2753 | memcpy(da->da_addr, addr, alen); | |
2754 | da->da_addrlen = alen; | |
2755 | da->da_users = 1; | |
2756 | da->da_gusers = glbl ? 1 : 0; | |
2757 | da->next = *list; | |
2758 | *list = da; | |
61cbc2fc | 2759 | (*count)++; |
bf742482 PM |
2760 | return 0; |
2761 | } | |
2762 | ||
4417da66 PM |
2763 | /** |
2764 | * dev_unicast_delete - Release secondary unicast address. | |
2765 | * @dev: device | |
0ed72ec4 RD |
2766 | * @addr: address to delete |
2767 | * @alen: length of @addr | |
4417da66 PM |
2768 | * |
2769 | * Release reference to a secondary unicast address and remove it | |
0ed72ec4 | 2770 | * from the device if the reference count drops to zero. |
4417da66 PM |
2771 | * |
2772 | * The caller must hold the rtnl_mutex. | |
2773 | */ | |
2774 | int dev_unicast_delete(struct net_device *dev, void *addr, int alen) | |
2775 | { | |
2776 | int err; | |
2777 | ||
2778 | ASSERT_RTNL(); | |
2779 | ||
2780 | netif_tx_lock_bh(dev); | |
61cbc2fc PM |
2781 | err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0); |
2782 | if (!err) | |
4417da66 | 2783 | __dev_set_rx_mode(dev); |
4417da66 PM |
2784 | netif_tx_unlock_bh(dev); |
2785 | return err; | |
2786 | } | |
2787 | EXPORT_SYMBOL(dev_unicast_delete); | |
2788 | ||
2789 | /** | |
2790 | * dev_unicast_add - add a secondary unicast address | |
2791 | * @dev: device | |
0ed72ec4 RD |
2792 | * @addr: address to delete |
2793 | * @alen: length of @addr | |
4417da66 PM |
2794 | * |
2795 | * Add a secondary unicast address to the device or increase | |
2796 | * the reference count if it already exists. | |
2797 | * | |
2798 | * The caller must hold the rtnl_mutex. | |
2799 | */ | |
2800 | int dev_unicast_add(struct net_device *dev, void *addr, int alen) | |
2801 | { | |
2802 | int err; | |
2803 | ||
2804 | ASSERT_RTNL(); | |
2805 | ||
2806 | netif_tx_lock_bh(dev); | |
61cbc2fc PM |
2807 | err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0); |
2808 | if (!err) | |
4417da66 | 2809 | __dev_set_rx_mode(dev); |
4417da66 PM |
2810 | netif_tx_unlock_bh(dev); |
2811 | return err; | |
2812 | } | |
2813 | EXPORT_SYMBOL(dev_unicast_add); | |
2814 | ||
12972621 DC |
2815 | static void __dev_addr_discard(struct dev_addr_list **list) |
2816 | { | |
2817 | struct dev_addr_list *tmp; | |
2818 | ||
2819 | while (*list != NULL) { | |
2820 | tmp = *list; | |
2821 | *list = tmp->next; | |
2822 | if (tmp->da_users > tmp->da_gusers) | |
2823 | printk("__dev_addr_discard: address leakage! " | |
2824 | "da_users=%d\n", tmp->da_users); | |
2825 | kfree(tmp); | |
2826 | } | |
2827 | } | |
2828 | ||
26cc2522 | 2829 | static void dev_addr_discard(struct net_device *dev) |
4417da66 PM |
2830 | { |
2831 | netif_tx_lock_bh(dev); | |
26cc2522 | 2832 | |
4417da66 PM |
2833 | __dev_addr_discard(&dev->uc_list); |
2834 | dev->uc_count = 0; | |
4417da66 | 2835 | |
456ad75c DC |
2836 | __dev_addr_discard(&dev->mc_list); |
2837 | dev->mc_count = 0; | |
26cc2522 | 2838 | |
456ad75c DC |
2839 | netif_tx_unlock_bh(dev); |
2840 | } | |
2841 | ||
1da177e4 LT |
2842 | unsigned dev_get_flags(const struct net_device *dev) |
2843 | { | |
2844 | unsigned flags; | |
2845 | ||
2846 | flags = (dev->flags & ~(IFF_PROMISC | | |
2847 | IFF_ALLMULTI | | |
b00055aa SR |
2848 | IFF_RUNNING | |
2849 | IFF_LOWER_UP | | |
2850 | IFF_DORMANT)) | | |
1da177e4 LT |
2851 | (dev->gflags & (IFF_PROMISC | |
2852 | IFF_ALLMULTI)); | |
2853 | ||
b00055aa SR |
2854 | if (netif_running(dev)) { |
2855 | if (netif_oper_up(dev)) | |
2856 | flags |= IFF_RUNNING; | |
2857 | if (netif_carrier_ok(dev)) | |
2858 | flags |= IFF_LOWER_UP; | |
2859 | if (netif_dormant(dev)) | |
2860 | flags |= IFF_DORMANT; | |
2861 | } | |
1da177e4 LT |
2862 | |
2863 | return flags; | |
2864 | } | |
2865 | ||
2866 | int dev_change_flags(struct net_device *dev, unsigned flags) | |
2867 | { | |
7c355f53 | 2868 | int ret, changes; |
1da177e4 LT |
2869 | int old_flags = dev->flags; |
2870 | ||
24023451 PM |
2871 | ASSERT_RTNL(); |
2872 | ||
1da177e4 LT |
2873 | /* |
2874 | * Set the flags on our device. | |
2875 | */ | |
2876 | ||
2877 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
2878 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
2879 | IFF_AUTOMEDIA)) | | |
2880 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
2881 | IFF_ALLMULTI)); | |
2882 | ||
2883 | /* | |
2884 | * Load in the correct multicast list now the flags have changed. | |
2885 | */ | |
2886 | ||
24023451 PM |
2887 | if (dev->change_rx_flags && (dev->flags ^ flags) & IFF_MULTICAST) |
2888 | dev->change_rx_flags(dev, IFF_MULTICAST); | |
2889 | ||
4417da66 | 2890 | dev_set_rx_mode(dev); |
1da177e4 LT |
2891 | |
2892 | /* | |
2893 | * Have we downed the interface. We handle IFF_UP ourselves | |
2894 | * according to user attempts to set it, rather than blindly | |
2895 | * setting it. | |
2896 | */ | |
2897 | ||
2898 | ret = 0; | |
2899 | if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */ | |
2900 | ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev); | |
2901 | ||
2902 | if (!ret) | |
4417da66 | 2903 | dev_set_rx_mode(dev); |
1da177e4 LT |
2904 | } |
2905 | ||
2906 | if (dev->flags & IFF_UP && | |
2907 | ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI | | |
2908 | IFF_VOLATILE))) | |
f07d5b94 | 2909 | raw_notifier_call_chain(&netdev_chain, |
e041c683 | 2910 | NETDEV_CHANGE, dev); |
1da177e4 LT |
2911 | |
2912 | if ((flags ^ dev->gflags) & IFF_PROMISC) { | |
2913 | int inc = (flags & IFF_PROMISC) ? +1 : -1; | |
2914 | dev->gflags ^= IFF_PROMISC; | |
2915 | dev_set_promiscuity(dev, inc); | |
2916 | } | |
2917 | ||
2918 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
2919 | is important. Some (broken) drivers set IFF_PROMISC, when | |
2920 | IFF_ALLMULTI is requested not asking us and not reporting. | |
2921 | */ | |
2922 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
2923 | int inc = (flags & IFF_ALLMULTI) ? +1 : -1; | |
2924 | dev->gflags ^= IFF_ALLMULTI; | |
2925 | dev_set_allmulti(dev, inc); | |
2926 | } | |
2927 | ||
7c355f53 TG |
2928 | /* Exclude state transition flags, already notified */ |
2929 | changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING); | |
2930 | if (changes) | |
2931 | rtmsg_ifinfo(RTM_NEWLINK, dev, changes); | |
1da177e4 LT |
2932 | |
2933 | return ret; | |
2934 | } | |
2935 | ||
2936 | int dev_set_mtu(struct net_device *dev, int new_mtu) | |
2937 | { | |
2938 | int err; | |
2939 | ||
2940 | if (new_mtu == dev->mtu) | |
2941 | return 0; | |
2942 | ||
2943 | /* MTU must be positive. */ | |
2944 | if (new_mtu < 0) | |
2945 | return -EINVAL; | |
2946 | ||
2947 | if (!netif_device_present(dev)) | |
2948 | return -ENODEV; | |
2949 | ||
2950 | err = 0; | |
2951 | if (dev->change_mtu) | |
2952 | err = dev->change_mtu(dev, new_mtu); | |
2953 | else | |
2954 | dev->mtu = new_mtu; | |
2955 | if (!err && dev->flags & IFF_UP) | |
f07d5b94 | 2956 | raw_notifier_call_chain(&netdev_chain, |
e041c683 | 2957 | NETDEV_CHANGEMTU, dev); |
1da177e4 LT |
2958 | return err; |
2959 | } | |
2960 | ||
2961 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) | |
2962 | { | |
2963 | int err; | |
2964 | ||
2965 | if (!dev->set_mac_address) | |
2966 | return -EOPNOTSUPP; | |
2967 | if (sa->sa_family != dev->type) | |
2968 | return -EINVAL; | |
2969 | if (!netif_device_present(dev)) | |
2970 | return -ENODEV; | |
2971 | err = dev->set_mac_address(dev, sa); | |
2972 | if (!err) | |
f07d5b94 | 2973 | raw_notifier_call_chain(&netdev_chain, |
e041c683 | 2974 | NETDEV_CHANGEADDR, dev); |
1da177e4 LT |
2975 | return err; |
2976 | } | |
2977 | ||
2978 | /* | |
2979 | * Perform the SIOCxIFxxx calls. | |
2980 | */ | |
2981 | static int dev_ifsioc(struct ifreq *ifr, unsigned int cmd) | |
2982 | { | |
2983 | int err; | |
2984 | struct net_device *dev = __dev_get_by_name(ifr->ifr_name); | |
2985 | ||
2986 | if (!dev) | |
2987 | return -ENODEV; | |
2988 | ||
2989 | switch (cmd) { | |
2990 | case SIOCGIFFLAGS: /* Get interface flags */ | |
2991 | ifr->ifr_flags = dev_get_flags(dev); | |
2992 | return 0; | |
2993 | ||
2994 | case SIOCSIFFLAGS: /* Set interface flags */ | |
2995 | return dev_change_flags(dev, ifr->ifr_flags); | |
2996 | ||
2997 | case SIOCGIFMETRIC: /* Get the metric on the interface | |
2998 | (currently unused) */ | |
2999 | ifr->ifr_metric = 0; | |
3000 | return 0; | |
3001 | ||
3002 | case SIOCSIFMETRIC: /* Set the metric on the interface | |
3003 | (currently unused) */ | |
3004 | return -EOPNOTSUPP; | |
3005 | ||
3006 | case SIOCGIFMTU: /* Get the MTU of a device */ | |
3007 | ifr->ifr_mtu = dev->mtu; | |
3008 | return 0; | |
3009 | ||
3010 | case SIOCSIFMTU: /* Set the MTU of a device */ | |
3011 | return dev_set_mtu(dev, ifr->ifr_mtu); | |
3012 | ||
3013 | case SIOCGIFHWADDR: | |
3014 | if (!dev->addr_len) | |
3015 | memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data); | |
3016 | else | |
3017 | memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr, | |
3018 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); | |
3019 | ifr->ifr_hwaddr.sa_family = dev->type; | |
3020 | return 0; | |
3021 | ||
3022 | case SIOCSIFHWADDR: | |
3023 | return dev_set_mac_address(dev, &ifr->ifr_hwaddr); | |
3024 | ||
3025 | case SIOCSIFHWBROADCAST: | |
3026 | if (ifr->ifr_hwaddr.sa_family != dev->type) | |
3027 | return -EINVAL; | |
3028 | memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, | |
3029 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); | |
f07d5b94 | 3030 | raw_notifier_call_chain(&netdev_chain, |
1da177e4 LT |
3031 | NETDEV_CHANGEADDR, dev); |
3032 | return 0; | |
3033 | ||
3034 | case SIOCGIFMAP: | |
3035 | ifr->ifr_map.mem_start = dev->mem_start; | |
3036 | ifr->ifr_map.mem_end = dev->mem_end; | |
3037 | ifr->ifr_map.base_addr = dev->base_addr; | |
3038 | ifr->ifr_map.irq = dev->irq; | |
3039 | ifr->ifr_map.dma = dev->dma; | |
3040 | ifr->ifr_map.port = dev->if_port; | |
3041 | return 0; | |
3042 | ||
3043 | case SIOCSIFMAP: | |
3044 | if (dev->set_config) { | |
3045 | if (!netif_device_present(dev)) | |
3046 | return -ENODEV; | |
3047 | return dev->set_config(dev, &ifr->ifr_map); | |
3048 | } | |
3049 | return -EOPNOTSUPP; | |
3050 | ||
3051 | case SIOCADDMULTI: | |
3052 | if (!dev->set_multicast_list || | |
3053 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) | |
3054 | return -EINVAL; | |
3055 | if (!netif_device_present(dev)) | |
3056 | return -ENODEV; | |
3057 | return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data, | |
3058 | dev->addr_len, 1); | |
3059 | ||
3060 | case SIOCDELMULTI: | |
3061 | if (!dev->set_multicast_list || | |
3062 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) | |
3063 | return -EINVAL; | |
3064 | if (!netif_device_present(dev)) | |
3065 | return -ENODEV; | |
3066 | return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data, | |
3067 | dev->addr_len, 1); | |
3068 | ||
3069 | case SIOCGIFINDEX: | |
3070 | ifr->ifr_ifindex = dev->ifindex; | |
3071 | return 0; | |
3072 | ||
3073 | case SIOCGIFTXQLEN: | |
3074 | ifr->ifr_qlen = dev->tx_queue_len; | |
3075 | return 0; | |
3076 | ||
3077 | case SIOCSIFTXQLEN: | |
3078 | if (ifr->ifr_qlen < 0) | |
3079 | return -EINVAL; | |
3080 | dev->tx_queue_len = ifr->ifr_qlen; | |
3081 | return 0; | |
3082 | ||
3083 | case SIOCSIFNAME: | |
3084 | ifr->ifr_newname[IFNAMSIZ-1] = '\0'; | |
3085 | return dev_change_name(dev, ifr->ifr_newname); | |
3086 | ||
3087 | /* | |
3088 | * Unknown or private ioctl | |
3089 | */ | |
3090 | ||
3091 | default: | |
3092 | if ((cmd >= SIOCDEVPRIVATE && | |
3093 | cmd <= SIOCDEVPRIVATE + 15) || | |
3094 | cmd == SIOCBONDENSLAVE || | |
3095 | cmd == SIOCBONDRELEASE || | |
3096 | cmd == SIOCBONDSETHWADDR || | |
3097 | cmd == SIOCBONDSLAVEINFOQUERY || | |
3098 | cmd == SIOCBONDINFOQUERY || | |
3099 | cmd == SIOCBONDCHANGEACTIVE || | |
3100 | cmd == SIOCGMIIPHY || | |
3101 | cmd == SIOCGMIIREG || | |
3102 | cmd == SIOCSMIIREG || | |
3103 | cmd == SIOCBRADDIF || | |
3104 | cmd == SIOCBRDELIF || | |
3105 | cmd == SIOCWANDEV) { | |
3106 | err = -EOPNOTSUPP; | |
3107 | if (dev->do_ioctl) { | |
3108 | if (netif_device_present(dev)) | |
3109 | err = dev->do_ioctl(dev, ifr, | |
3110 | cmd); | |
3111 | else | |
3112 | err = -ENODEV; | |
3113 | } | |
3114 | } else | |
3115 | err = -EINVAL; | |
3116 | ||
3117 | } | |
3118 | return err; | |
3119 | } | |
3120 | ||
3121 | /* | |
3122 | * This function handles all "interface"-type I/O control requests. The actual | |
3123 | * 'doing' part of this is dev_ifsioc above. | |
3124 | */ | |
3125 | ||
3126 | /** | |
3127 | * dev_ioctl - network device ioctl | |
3128 | * @cmd: command to issue | |
3129 | * @arg: pointer to a struct ifreq in user space | |
3130 | * | |
3131 | * Issue ioctl functions to devices. This is normally called by the | |
3132 | * user space syscall interfaces but can sometimes be useful for | |
3133 | * other purposes. The return value is the return from the syscall if | |
3134 | * positive or a negative errno code on error. | |
3135 | */ | |
3136 | ||
3137 | int dev_ioctl(unsigned int cmd, void __user *arg) | |
3138 | { | |
3139 | struct ifreq ifr; | |
3140 | int ret; | |
3141 | char *colon; | |
3142 | ||
3143 | /* One special case: SIOCGIFCONF takes ifconf argument | |
3144 | and requires shared lock, because it sleeps writing | |
3145 | to user space. | |
3146 | */ | |
3147 | ||
3148 | if (cmd == SIOCGIFCONF) { | |
6756ae4b | 3149 | rtnl_lock(); |
1da177e4 | 3150 | ret = dev_ifconf((char __user *) arg); |
6756ae4b | 3151 | rtnl_unlock(); |
1da177e4 LT |
3152 | return ret; |
3153 | } | |
3154 | if (cmd == SIOCGIFNAME) | |
3155 | return dev_ifname((struct ifreq __user *)arg); | |
3156 | ||
3157 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
3158 | return -EFAULT; | |
3159 | ||
3160 | ifr.ifr_name[IFNAMSIZ-1] = 0; | |
3161 | ||
3162 | colon = strchr(ifr.ifr_name, ':'); | |
3163 | if (colon) | |
3164 | *colon = 0; | |
3165 | ||
3166 | /* | |
3167 | * See which interface the caller is talking about. | |
3168 | */ | |
3169 | ||
3170 | switch (cmd) { | |
3171 | /* | |
3172 | * These ioctl calls: | |
3173 | * - can be done by all. | |
3174 | * - atomic and do not require locking. | |
3175 | * - return a value | |
3176 | */ | |
3177 | case SIOCGIFFLAGS: | |
3178 | case SIOCGIFMETRIC: | |
3179 | case SIOCGIFMTU: | |
3180 | case SIOCGIFHWADDR: | |
3181 | case SIOCGIFSLAVE: | |
3182 | case SIOCGIFMAP: | |
3183 | case SIOCGIFINDEX: | |
3184 | case SIOCGIFTXQLEN: | |
3185 | dev_load(ifr.ifr_name); | |
3186 | read_lock(&dev_base_lock); | |
3187 | ret = dev_ifsioc(&ifr, cmd); | |
3188 | read_unlock(&dev_base_lock); | |
3189 | if (!ret) { | |
3190 | if (colon) | |
3191 | *colon = ':'; | |
3192 | if (copy_to_user(arg, &ifr, | |
3193 | sizeof(struct ifreq))) | |
3194 | ret = -EFAULT; | |
3195 | } | |
3196 | return ret; | |
3197 | ||
3198 | case SIOCETHTOOL: | |
3199 | dev_load(ifr.ifr_name); | |
3200 | rtnl_lock(); | |
3201 | ret = dev_ethtool(&ifr); | |
3202 | rtnl_unlock(); | |
3203 | if (!ret) { | |
3204 | if (colon) | |
3205 | *colon = ':'; | |
3206 | if (copy_to_user(arg, &ifr, | |
3207 | sizeof(struct ifreq))) | |
3208 | ret = -EFAULT; | |
3209 | } | |
3210 | return ret; | |
3211 | ||
3212 | /* | |
3213 | * These ioctl calls: | |
3214 | * - require superuser power. | |
3215 | * - require strict serialization. | |
3216 | * - return a value | |
3217 | */ | |
3218 | case SIOCGMIIPHY: | |
3219 | case SIOCGMIIREG: | |
3220 | case SIOCSIFNAME: | |
3221 | if (!capable(CAP_NET_ADMIN)) | |
3222 | return -EPERM; | |
3223 | dev_load(ifr.ifr_name); | |
3224 | rtnl_lock(); | |
3225 | ret = dev_ifsioc(&ifr, cmd); | |
3226 | rtnl_unlock(); | |
3227 | if (!ret) { | |
3228 | if (colon) | |
3229 | *colon = ':'; | |
3230 | if (copy_to_user(arg, &ifr, | |
3231 | sizeof(struct ifreq))) | |
3232 | ret = -EFAULT; | |
3233 | } | |
3234 | return ret; | |
3235 | ||
3236 | /* | |
3237 | * These ioctl calls: | |
3238 | * - require superuser power. | |
3239 | * - require strict serialization. | |
3240 | * - do not return a value | |
3241 | */ | |
3242 | case SIOCSIFFLAGS: | |
3243 | case SIOCSIFMETRIC: | |
3244 | case SIOCSIFMTU: | |
3245 | case SIOCSIFMAP: | |
3246 | case SIOCSIFHWADDR: | |
3247 | case SIOCSIFSLAVE: | |
3248 | case SIOCADDMULTI: | |
3249 | case SIOCDELMULTI: | |
3250 | case SIOCSIFHWBROADCAST: | |
3251 | case SIOCSIFTXQLEN: | |
3252 | case SIOCSMIIREG: | |
3253 | case SIOCBONDENSLAVE: | |
3254 | case SIOCBONDRELEASE: | |
3255 | case SIOCBONDSETHWADDR: | |
1da177e4 LT |
3256 | case SIOCBONDCHANGEACTIVE: |
3257 | case SIOCBRADDIF: | |
3258 | case SIOCBRDELIF: | |
3259 | if (!capable(CAP_NET_ADMIN)) | |
3260 | return -EPERM; | |
cabcac0b TG |
3261 | /* fall through */ |
3262 | case SIOCBONDSLAVEINFOQUERY: | |
3263 | case SIOCBONDINFOQUERY: | |
1da177e4 LT |
3264 | dev_load(ifr.ifr_name); |
3265 | rtnl_lock(); | |
3266 | ret = dev_ifsioc(&ifr, cmd); | |
3267 | rtnl_unlock(); | |
3268 | return ret; | |
3269 | ||
3270 | case SIOCGIFMEM: | |
3271 | /* Get the per device memory space. We can add this but | |
3272 | * currently do not support it */ | |
3273 | case SIOCSIFMEM: | |
3274 | /* Set the per device memory buffer space. | |
3275 | * Not applicable in our case */ | |
3276 | case SIOCSIFLINK: | |
3277 | return -EINVAL; | |
3278 | ||
3279 | /* | |
3280 | * Unknown or private ioctl. | |
3281 | */ | |
3282 | default: | |
3283 | if (cmd == SIOCWANDEV || | |
3284 | (cmd >= SIOCDEVPRIVATE && | |
3285 | cmd <= SIOCDEVPRIVATE + 15)) { | |
3286 | dev_load(ifr.ifr_name); | |
3287 | rtnl_lock(); | |
3288 | ret = dev_ifsioc(&ifr, cmd); | |
3289 | rtnl_unlock(); | |
3290 | if (!ret && copy_to_user(arg, &ifr, | |
3291 | sizeof(struct ifreq))) | |
3292 | ret = -EFAULT; | |
3293 | return ret; | |
3294 | } | |
1da177e4 | 3295 | /* Take care of Wireless Extensions */ |
295f4a1f JB |
3296 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) |
3297 | return wext_handle_ioctl(&ifr, cmd, arg); | |
1da177e4 LT |
3298 | return -EINVAL; |
3299 | } | |
3300 | } | |
3301 | ||
3302 | ||
3303 | /** | |
3304 | * dev_new_index - allocate an ifindex | |
3305 | * | |
3306 | * Returns a suitable unique value for a new device interface | |
3307 | * number. The caller must hold the rtnl semaphore or the | |
3308 | * dev_base_lock to be sure it remains unique. | |
3309 | */ | |
3310 | static int dev_new_index(void) | |
3311 | { | |
3312 | static int ifindex; | |
3313 | for (;;) { | |
3314 | if (++ifindex <= 0) | |
3315 | ifindex = 1; | |
3316 | if (!__dev_get_by_index(ifindex)) | |
3317 | return ifindex; | |
3318 | } | |
3319 | } | |
3320 | ||
3321 | static int dev_boot_phase = 1; | |
3322 | ||
3323 | /* Delayed registration/unregisteration */ | |
3324 | static DEFINE_SPINLOCK(net_todo_list_lock); | |
3325 | static struct list_head net_todo_list = LIST_HEAD_INIT(net_todo_list); | |
3326 | ||
6f05f629 | 3327 | static void net_set_todo(struct net_device *dev) |
1da177e4 LT |
3328 | { |
3329 | spin_lock(&net_todo_list_lock); | |
3330 | list_add_tail(&dev->todo_list, &net_todo_list); | |
3331 | spin_unlock(&net_todo_list_lock); | |
3332 | } | |
3333 | ||
3334 | /** | |
3335 | * register_netdevice - register a network device | |
3336 | * @dev: device to register | |
3337 | * | |
3338 | * Take a completed network device structure and add it to the kernel | |
3339 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
3340 | * chain. 0 is returned on success. A negative errno code is returned | |
3341 | * on a failure to set up the device, or if the name is a duplicate. | |
3342 | * | |
3343 | * Callers must hold the rtnl semaphore. You may want | |
3344 | * register_netdev() instead of this. | |
3345 | * | |
3346 | * BUGS: | |
3347 | * The locking appears insufficient to guarantee two parallel registers | |
3348 | * will not get the same name. | |
3349 | */ | |
3350 | ||
3351 | int register_netdevice(struct net_device *dev) | |
3352 | { | |
3353 | struct hlist_head *head; | |
3354 | struct hlist_node *p; | |
3355 | int ret; | |
3356 | ||
3357 | BUG_ON(dev_boot_phase); | |
3358 | ASSERT_RTNL(); | |
3359 | ||
b17a7c17 SH |
3360 | might_sleep(); |
3361 | ||
1da177e4 LT |
3362 | /* When net_device's are persistent, this will be fatal. */ |
3363 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
3364 | ||
3365 | spin_lock_init(&dev->queue_lock); | |
932ff279 | 3366 | spin_lock_init(&dev->_xmit_lock); |
723e98b7 | 3367 | netdev_set_lockdep_class(&dev->_xmit_lock, dev->type); |
1da177e4 | 3368 | dev->xmit_lock_owner = -1; |
1da177e4 | 3369 | spin_lock_init(&dev->ingress_lock); |
1da177e4 | 3370 | |
1da177e4 LT |
3371 | dev->iflink = -1; |
3372 | ||
3373 | /* Init, if this function is available */ | |
3374 | if (dev->init) { | |
3375 | ret = dev->init(dev); | |
3376 | if (ret) { | |
3377 | if (ret > 0) | |
3378 | ret = -EIO; | |
90833aa4 | 3379 | goto out; |
1da177e4 LT |
3380 | } |
3381 | } | |
4ec93edb | 3382 | |
1da177e4 LT |
3383 | if (!dev_valid_name(dev->name)) { |
3384 | ret = -EINVAL; | |
7ce1b0ed | 3385 | goto err_uninit; |
1da177e4 LT |
3386 | } |
3387 | ||
3388 | dev->ifindex = dev_new_index(); | |
3389 | if (dev->iflink == -1) | |
3390 | dev->iflink = dev->ifindex; | |
3391 | ||
3392 | /* Check for existence of name */ | |
3393 | head = dev_name_hash(dev->name); | |
3394 | hlist_for_each(p, head) { | |
3395 | struct net_device *d | |
3396 | = hlist_entry(p, struct net_device, name_hlist); | |
3397 | if (!strncmp(d->name, dev->name, IFNAMSIZ)) { | |
3398 | ret = -EEXIST; | |
7ce1b0ed | 3399 | goto err_uninit; |
1da177e4 | 3400 | } |
4ec93edb | 3401 | } |
1da177e4 | 3402 | |
d212f87b SH |
3403 | /* Fix illegal checksum combinations */ |
3404 | if ((dev->features & NETIF_F_HW_CSUM) && | |
3405 | (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
3406 | printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n", | |
3407 | dev->name); | |
3408 | dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); | |
3409 | } | |
3410 | ||
3411 | if ((dev->features & NETIF_F_NO_CSUM) && | |
3412 | (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
3413 | printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n", | |
3414 | dev->name); | |
3415 | dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM); | |
3416 | } | |
3417 | ||
3418 | ||
1da177e4 LT |
3419 | /* Fix illegal SG+CSUM combinations. */ |
3420 | if ((dev->features & NETIF_F_SG) && | |
8648b305 | 3421 | !(dev->features & NETIF_F_ALL_CSUM)) { |
5a8da02b | 3422 | printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no checksum feature.\n", |
1da177e4 LT |
3423 | dev->name); |
3424 | dev->features &= ~NETIF_F_SG; | |
3425 | } | |
3426 | ||
3427 | /* TSO requires that SG is present as well. */ | |
3428 | if ((dev->features & NETIF_F_TSO) && | |
3429 | !(dev->features & NETIF_F_SG)) { | |
5a8da02b | 3430 | printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no SG feature.\n", |
1da177e4 LT |
3431 | dev->name); |
3432 | dev->features &= ~NETIF_F_TSO; | |
3433 | } | |
e89e9cf5 AR |
3434 | if (dev->features & NETIF_F_UFO) { |
3435 | if (!(dev->features & NETIF_F_HW_CSUM)) { | |
3436 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no " | |
3437 | "NETIF_F_HW_CSUM feature.\n", | |
3438 | dev->name); | |
3439 | dev->features &= ~NETIF_F_UFO; | |
3440 | } | |
3441 | if (!(dev->features & NETIF_F_SG)) { | |
3442 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO since no " | |
3443 | "NETIF_F_SG feature.\n", | |
3444 | dev->name); | |
3445 | dev->features &= ~NETIF_F_UFO; | |
3446 | } | |
3447 | } | |
1da177e4 LT |
3448 | |
3449 | /* | |
3450 | * nil rebuild_header routine, | |
3451 | * that should be never called and used as just bug trap. | |
3452 | */ | |
3453 | ||
3454 | if (!dev->rebuild_header) | |
3455 | dev->rebuild_header = default_rebuild_header; | |
3456 | ||
b17a7c17 SH |
3457 | ret = netdev_register_sysfs(dev); |
3458 | if (ret) | |
7ce1b0ed | 3459 | goto err_uninit; |
b17a7c17 SH |
3460 | dev->reg_state = NETREG_REGISTERED; |
3461 | ||
1da177e4 LT |
3462 | /* |
3463 | * Default initial state at registry is that the | |
3464 | * device is present. | |
3465 | */ | |
3466 | ||
3467 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
3468 | ||
1da177e4 LT |
3469 | dev_init_scheduler(dev); |
3470 | write_lock_bh(&dev_base_lock); | |
7562f876 | 3471 | list_add_tail(&dev->dev_list, &dev_base_head); |
1da177e4 LT |
3472 | hlist_add_head(&dev->name_hlist, head); |
3473 | hlist_add_head(&dev->index_hlist, dev_index_hash(dev->ifindex)); | |
3474 | dev_hold(dev); | |
1da177e4 LT |
3475 | write_unlock_bh(&dev_base_lock); |
3476 | ||
3477 | /* Notify protocols, that a new device appeared. */ | |
fcc5a03a HX |
3478 | ret = raw_notifier_call_chain(&netdev_chain, NETDEV_REGISTER, dev); |
3479 | ret = notifier_to_errno(ret); | |
3480 | if (ret) | |
3481 | unregister_netdevice(dev); | |
1da177e4 LT |
3482 | |
3483 | out: | |
3484 | return ret; | |
7ce1b0ed HX |
3485 | |
3486 | err_uninit: | |
3487 | if (dev->uninit) | |
3488 | dev->uninit(dev); | |
3489 | goto out; | |
1da177e4 LT |
3490 | } |
3491 | ||
3492 | /** | |
3493 | * register_netdev - register a network device | |
3494 | * @dev: device to register | |
3495 | * | |
3496 | * Take a completed network device structure and add it to the kernel | |
3497 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
3498 | * chain. 0 is returned on success. A negative errno code is returned | |
3499 | * on a failure to set up the device, or if the name is a duplicate. | |
3500 | * | |
38b4da38 | 3501 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
3502 | * and expands the device name if you passed a format string to |
3503 | * alloc_netdev. | |
3504 | */ | |
3505 | int register_netdev(struct net_device *dev) | |
3506 | { | |
3507 | int err; | |
3508 | ||
3509 | rtnl_lock(); | |
3510 | ||
3511 | /* | |
3512 | * If the name is a format string the caller wants us to do a | |
3513 | * name allocation. | |
3514 | */ | |
3515 | if (strchr(dev->name, '%')) { | |
3516 | err = dev_alloc_name(dev, dev->name); | |
3517 | if (err < 0) | |
3518 | goto out; | |
3519 | } | |
4ec93edb | 3520 | |
1da177e4 LT |
3521 | err = register_netdevice(dev); |
3522 | out: | |
3523 | rtnl_unlock(); | |
3524 | return err; | |
3525 | } | |
3526 | EXPORT_SYMBOL(register_netdev); | |
3527 | ||
3528 | /* | |
3529 | * netdev_wait_allrefs - wait until all references are gone. | |
3530 | * | |
3531 | * This is called when unregistering network devices. | |
3532 | * | |
3533 | * Any protocol or device that holds a reference should register | |
3534 | * for netdevice notification, and cleanup and put back the | |
3535 | * reference if they receive an UNREGISTER event. | |
3536 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 3537 | * call dev_put. |
1da177e4 LT |
3538 | */ |
3539 | static void netdev_wait_allrefs(struct net_device *dev) | |
3540 | { | |
3541 | unsigned long rebroadcast_time, warning_time; | |
3542 | ||
3543 | rebroadcast_time = warning_time = jiffies; | |
3544 | while (atomic_read(&dev->refcnt) != 0) { | |
3545 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { | |
6756ae4b | 3546 | rtnl_lock(); |
1da177e4 LT |
3547 | |
3548 | /* Rebroadcast unregister notification */ | |
f07d5b94 | 3549 | raw_notifier_call_chain(&netdev_chain, |
1da177e4 LT |
3550 | NETDEV_UNREGISTER, dev); |
3551 | ||
3552 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, | |
3553 | &dev->state)) { | |
3554 | /* We must not have linkwatch events | |
3555 | * pending on unregister. If this | |
3556 | * happens, we simply run the queue | |
3557 | * unscheduled, resulting in a noop | |
3558 | * for this device. | |
3559 | */ | |
3560 | linkwatch_run_queue(); | |
3561 | } | |
3562 | ||
6756ae4b | 3563 | __rtnl_unlock(); |
1da177e4 LT |
3564 | |
3565 | rebroadcast_time = jiffies; | |
3566 | } | |
3567 | ||
3568 | msleep(250); | |
3569 | ||
3570 | if (time_after(jiffies, warning_time + 10 * HZ)) { | |
3571 | printk(KERN_EMERG "unregister_netdevice: " | |
3572 | "waiting for %s to become free. Usage " | |
3573 | "count = %d\n", | |
3574 | dev->name, atomic_read(&dev->refcnt)); | |
3575 | warning_time = jiffies; | |
3576 | } | |
3577 | } | |
3578 | } | |
3579 | ||
3580 | /* The sequence is: | |
3581 | * | |
3582 | * rtnl_lock(); | |
3583 | * ... | |
3584 | * register_netdevice(x1); | |
3585 | * register_netdevice(x2); | |
3586 | * ... | |
3587 | * unregister_netdevice(y1); | |
3588 | * unregister_netdevice(y2); | |
3589 | * ... | |
3590 | * rtnl_unlock(); | |
3591 | * free_netdev(y1); | |
3592 | * free_netdev(y2); | |
3593 | * | |
3594 | * We are invoked by rtnl_unlock() after it drops the semaphore. | |
3595 | * This allows us to deal with problems: | |
b17a7c17 | 3596 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
3597 | * without deadlocking with linkwatch via keventd. |
3598 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
3599 | * safely in order to wait for the netdev refcnt to drop to zero. | |
3600 | */ | |
4a3e2f71 | 3601 | static DEFINE_MUTEX(net_todo_run_mutex); |
1da177e4 LT |
3602 | void netdev_run_todo(void) |
3603 | { | |
626ab0e6 | 3604 | struct list_head list; |
1da177e4 LT |
3605 | |
3606 | /* Need to guard against multiple cpu's getting out of order. */ | |
4a3e2f71 | 3607 | mutex_lock(&net_todo_run_mutex); |
1da177e4 LT |
3608 | |
3609 | /* Not safe to do outside the semaphore. We must not return | |
3610 | * until all unregister events invoked by the local processor | |
3611 | * have been completed (either by this todo run, or one on | |
3612 | * another cpu). | |
3613 | */ | |
3614 | if (list_empty(&net_todo_list)) | |
3615 | goto out; | |
3616 | ||
3617 | /* Snapshot list, allow later requests */ | |
3618 | spin_lock(&net_todo_list_lock); | |
626ab0e6 | 3619 | list_replace_init(&net_todo_list, &list); |
1da177e4 | 3620 | spin_unlock(&net_todo_list_lock); |
626ab0e6 | 3621 | |
1da177e4 LT |
3622 | while (!list_empty(&list)) { |
3623 | struct net_device *dev | |
3624 | = list_entry(list.next, struct net_device, todo_list); | |
3625 | list_del(&dev->todo_list); | |
3626 | ||
b17a7c17 SH |
3627 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
3628 | printk(KERN_ERR "network todo '%s' but state %d\n", | |
3629 | dev->name, dev->reg_state); | |
3630 | dump_stack(); | |
3631 | continue; | |
3632 | } | |
1da177e4 | 3633 | |
b17a7c17 | 3634 | dev->reg_state = NETREG_UNREGISTERED; |
1da177e4 | 3635 | |
b17a7c17 | 3636 | netdev_wait_allrefs(dev); |
1da177e4 | 3637 | |
b17a7c17 SH |
3638 | /* paranoia */ |
3639 | BUG_ON(atomic_read(&dev->refcnt)); | |
3640 | BUG_TRAP(!dev->ip_ptr); | |
3641 | BUG_TRAP(!dev->ip6_ptr); | |
3642 | BUG_TRAP(!dev->dn_ptr); | |
1da177e4 | 3643 | |
b17a7c17 SH |
3644 | if (dev->destructor) |
3645 | dev->destructor(dev); | |
9093bbb2 SH |
3646 | |
3647 | /* Free network device */ | |
3648 | kobject_put(&dev->dev.kobj); | |
1da177e4 LT |
3649 | } |
3650 | ||
3651 | out: | |
4a3e2f71 | 3652 | mutex_unlock(&net_todo_run_mutex); |
1da177e4 LT |
3653 | } |
3654 | ||
5a1b5898 | 3655 | static struct net_device_stats *internal_stats(struct net_device *dev) |
c45d286e | 3656 | { |
5a1b5898 | 3657 | return &dev->stats; |
c45d286e RR |
3658 | } |
3659 | ||
1da177e4 | 3660 | /** |
f25f4e44 | 3661 | * alloc_netdev_mq - allocate network device |
1da177e4 LT |
3662 | * @sizeof_priv: size of private data to allocate space for |
3663 | * @name: device name format string | |
3664 | * @setup: callback to initialize device | |
f25f4e44 | 3665 | * @queue_count: the number of subqueues to allocate |
1da177e4 LT |
3666 | * |
3667 | * Allocates a struct net_device with private data area for driver use | |
f25f4e44 PWJ |
3668 | * and performs basic initialization. Also allocates subquue structs |
3669 | * for each queue on the device at the end of the netdevice. | |
1da177e4 | 3670 | */ |
f25f4e44 PWJ |
3671 | struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, |
3672 | void (*setup)(struct net_device *), unsigned int queue_count) | |
1da177e4 LT |
3673 | { |
3674 | void *p; | |
3675 | struct net_device *dev; | |
3676 | int alloc_size; | |
3677 | ||
b6fe17d6 SH |
3678 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
3679 | ||
1da177e4 | 3680 | /* ensure 32-byte alignment of both the device and private area */ |
f25f4e44 | 3681 | alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST + |
31ce72a6 | 3682 | (sizeof(struct net_device_subqueue) * (queue_count - 1))) & |
f25f4e44 | 3683 | ~NETDEV_ALIGN_CONST; |
1da177e4 LT |
3684 | alloc_size += sizeof_priv + NETDEV_ALIGN_CONST; |
3685 | ||
31380de9 | 3686 | p = kzalloc(alloc_size, GFP_KERNEL); |
1da177e4 | 3687 | if (!p) { |
b6fe17d6 | 3688 | printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n"); |
1da177e4 LT |
3689 | return NULL; |
3690 | } | |
1da177e4 LT |
3691 | |
3692 | dev = (struct net_device *) | |
3693 | (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); | |
3694 | dev->padded = (char *)dev - (char *)p; | |
3695 | ||
f25f4e44 PWJ |
3696 | if (sizeof_priv) { |
3697 | dev->priv = ((char *)dev + | |
3698 | ((sizeof(struct net_device) + | |
3699 | (sizeof(struct net_device_subqueue) * | |
31ce72a6 | 3700 | (queue_count - 1)) + NETDEV_ALIGN_CONST) |
f25f4e44 PWJ |
3701 | & ~NETDEV_ALIGN_CONST)); |
3702 | } | |
3703 | ||
3704 | dev->egress_subqueue_count = queue_count; | |
1da177e4 | 3705 | |
5a1b5898 | 3706 | dev->get_stats = internal_stats; |
1da177e4 LT |
3707 | setup(dev); |
3708 | strcpy(dev->name, name); | |
3709 | return dev; | |
3710 | } | |
f25f4e44 | 3711 | EXPORT_SYMBOL(alloc_netdev_mq); |
1da177e4 LT |
3712 | |
3713 | /** | |
3714 | * free_netdev - free network device | |
3715 | * @dev: device | |
3716 | * | |
4ec93edb YH |
3717 | * This function does the last stage of destroying an allocated device |
3718 | * interface. The reference to the device object is released. | |
1da177e4 LT |
3719 | * If this is the last reference then it will be freed. |
3720 | */ | |
3721 | void free_netdev(struct net_device *dev) | |
3722 | { | |
3723 | #ifdef CONFIG_SYSFS | |
3041a069 | 3724 | /* Compatibility with error handling in drivers */ |
1da177e4 LT |
3725 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
3726 | kfree((char *)dev - dev->padded); | |
3727 | return; | |
3728 | } | |
3729 | ||
3730 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
3731 | dev->reg_state = NETREG_RELEASED; | |
3732 | ||
43cb76d9 GKH |
3733 | /* will free via device release */ |
3734 | put_device(&dev->dev); | |
1da177e4 LT |
3735 | #else |
3736 | kfree((char *)dev - dev->padded); | |
3737 | #endif | |
3738 | } | |
4ec93edb | 3739 | |
1da177e4 | 3740 | /* Synchronize with packet receive processing. */ |
4ec93edb | 3741 | void synchronize_net(void) |
1da177e4 LT |
3742 | { |
3743 | might_sleep(); | |
fbd568a3 | 3744 | synchronize_rcu(); |
1da177e4 LT |
3745 | } |
3746 | ||
3747 | /** | |
3748 | * unregister_netdevice - remove device from the kernel | |
3749 | * @dev: device | |
3750 | * | |
3751 | * This function shuts down a device interface and removes it | |
3752 | * from the kernel tables. On success 0 is returned, on a failure | |
3753 | * a negative errno code is returned. | |
3754 | * | |
3755 | * Callers must hold the rtnl semaphore. You may want | |
3756 | * unregister_netdev() instead of this. | |
3757 | */ | |
3758 | ||
22f8cde5 | 3759 | void unregister_netdevice(struct net_device *dev) |
1da177e4 | 3760 | { |
1da177e4 LT |
3761 | BUG_ON(dev_boot_phase); |
3762 | ASSERT_RTNL(); | |
3763 | ||
3764 | /* Some devices call without registering for initialization unwind. */ | |
3765 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
3766 | printk(KERN_DEBUG "unregister_netdevice: device %s/%p never " | |
3767 | "was registered\n", dev->name, dev); | |
22f8cde5 SH |
3768 | |
3769 | WARN_ON(1); | |
3770 | return; | |
1da177e4 LT |
3771 | } |
3772 | ||
3773 | BUG_ON(dev->reg_state != NETREG_REGISTERED); | |
3774 | ||
3775 | /* If device is running, close it first. */ | |
3776 | if (dev->flags & IFF_UP) | |
3777 | dev_close(dev); | |
3778 | ||
3779 | /* And unlink it from device chain. */ | |
7562f876 PE |
3780 | write_lock_bh(&dev_base_lock); |
3781 | list_del(&dev->dev_list); | |
3782 | hlist_del(&dev->name_hlist); | |
3783 | hlist_del(&dev->index_hlist); | |
3784 | write_unlock_bh(&dev_base_lock); | |
1da177e4 LT |
3785 | |
3786 | dev->reg_state = NETREG_UNREGISTERING; | |
3787 | ||
3788 | synchronize_net(); | |
3789 | ||
3790 | /* Shutdown queueing discipline. */ | |
3791 | dev_shutdown(dev); | |
3792 | ||
4ec93edb | 3793 | |
1da177e4 LT |
3794 | /* Notify protocols, that we are about to destroy |
3795 | this device. They should clean all the things. | |
3796 | */ | |
f07d5b94 | 3797 | raw_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev); |
4ec93edb | 3798 | |
1da177e4 | 3799 | /* |
4417da66 | 3800 | * Flush the unicast and multicast chains |
1da177e4 | 3801 | */ |
26cc2522 | 3802 | dev_addr_discard(dev); |
1da177e4 LT |
3803 | |
3804 | if (dev->uninit) | |
3805 | dev->uninit(dev); | |
3806 | ||
3807 | /* Notifier chain MUST detach us from master device. */ | |
3808 | BUG_TRAP(!dev->master); | |
3809 | ||
9093bbb2 SH |
3810 | /* Remove entries from sysfs */ |
3811 | netdev_unregister_sysfs(dev); | |
3812 | ||
1da177e4 LT |
3813 | /* Finish processing unregister after unlock */ |
3814 | net_set_todo(dev); | |
3815 | ||
3816 | synchronize_net(); | |
3817 | ||
3818 | dev_put(dev); | |
1da177e4 LT |
3819 | } |
3820 | ||
3821 | /** | |
3822 | * unregister_netdev - remove device from the kernel | |
3823 | * @dev: device | |
3824 | * | |
3825 | * This function shuts down a device interface and removes it | |
3826 | * from the kernel tables. On success 0 is returned, on a failure | |
3827 | * a negative errno code is returned. | |
3828 | * | |
3829 | * This is just a wrapper for unregister_netdevice that takes | |
3830 | * the rtnl semaphore. In general you want to use this and not | |
3831 | * unregister_netdevice. | |
3832 | */ | |
3833 | void unregister_netdev(struct net_device *dev) | |
3834 | { | |
3835 | rtnl_lock(); | |
3836 | unregister_netdevice(dev); | |
3837 | rtnl_unlock(); | |
3838 | } | |
3839 | ||
3840 | EXPORT_SYMBOL(unregister_netdev); | |
3841 | ||
1da177e4 LT |
3842 | static int dev_cpu_callback(struct notifier_block *nfb, |
3843 | unsigned long action, | |
3844 | void *ocpu) | |
3845 | { | |
3846 | struct sk_buff **list_skb; | |
3847 | struct net_device **list_net; | |
3848 | struct sk_buff *skb; | |
3849 | unsigned int cpu, oldcpu = (unsigned long)ocpu; | |
3850 | struct softnet_data *sd, *oldsd; | |
3851 | ||
8bb78442 | 3852 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
1da177e4 LT |
3853 | return NOTIFY_OK; |
3854 | ||
3855 | local_irq_disable(); | |
3856 | cpu = smp_processor_id(); | |
3857 | sd = &per_cpu(softnet_data, cpu); | |
3858 | oldsd = &per_cpu(softnet_data, oldcpu); | |
3859 | ||
3860 | /* Find end of our completion_queue. */ | |
3861 | list_skb = &sd->completion_queue; | |
3862 | while (*list_skb) | |
3863 | list_skb = &(*list_skb)->next; | |
3864 | /* Append completion queue from offline CPU. */ | |
3865 | *list_skb = oldsd->completion_queue; | |
3866 | oldsd->completion_queue = NULL; | |
3867 | ||
3868 | /* Find end of our output_queue. */ | |
3869 | list_net = &sd->output_queue; | |
3870 | while (*list_net) | |
3871 | list_net = &(*list_net)->next_sched; | |
3872 | /* Append output queue from offline CPU. */ | |
3873 | *list_net = oldsd->output_queue; | |
3874 | oldsd->output_queue = NULL; | |
3875 | ||
3876 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
3877 | local_irq_enable(); | |
3878 | ||
3879 | /* Process offline CPU's input_pkt_queue */ | |
3880 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) | |
3881 | netif_rx(skb); | |
3882 | ||
3883 | return NOTIFY_OK; | |
3884 | } | |
1da177e4 | 3885 | |
db217334 CL |
3886 | #ifdef CONFIG_NET_DMA |
3887 | /** | |
0ed72ec4 RD |
3888 | * net_dma_rebalance - try to maintain one DMA channel per CPU |
3889 | * @net_dma: DMA client and associated data (lock, channels, channel_mask) | |
3890 | * | |
3891 | * This is called when the number of channels allocated to the net_dma client | |
3892 | * changes. The net_dma client tries to have one DMA channel per CPU. | |
db217334 | 3893 | */ |
d379b01e DW |
3894 | |
3895 | static void net_dma_rebalance(struct net_dma *net_dma) | |
db217334 | 3896 | { |
d379b01e | 3897 | unsigned int cpu, i, n, chan_idx; |
db217334 CL |
3898 | struct dma_chan *chan; |
3899 | ||
d379b01e | 3900 | if (cpus_empty(net_dma->channel_mask)) { |
db217334 | 3901 | for_each_online_cpu(cpu) |
29bbd72d | 3902 | rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL); |
db217334 CL |
3903 | return; |
3904 | } | |
3905 | ||
3906 | i = 0; | |
3907 | cpu = first_cpu(cpu_online_map); | |
3908 | ||
d379b01e DW |
3909 | for_each_cpu_mask(chan_idx, net_dma->channel_mask) { |
3910 | chan = net_dma->channels[chan_idx]; | |
3911 | ||
3912 | n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask)) | |
3913 | + (i < (num_online_cpus() % | |
3914 | cpus_weight(net_dma->channel_mask)) ? 1 : 0)); | |
db217334 CL |
3915 | |
3916 | while(n) { | |
29bbd72d | 3917 | per_cpu(softnet_data, cpu).net_dma = chan; |
db217334 CL |
3918 | cpu = next_cpu(cpu, cpu_online_map); |
3919 | n--; | |
3920 | } | |
3921 | i++; | |
3922 | } | |
db217334 CL |
3923 | } |
3924 | ||
3925 | /** | |
3926 | * netdev_dma_event - event callback for the net_dma_client | |
3927 | * @client: should always be net_dma_client | |
f4b8ea78 | 3928 | * @chan: DMA channel for the event |
0ed72ec4 | 3929 | * @state: DMA state to be handled |
db217334 | 3930 | */ |
d379b01e DW |
3931 | static enum dma_state_client |
3932 | netdev_dma_event(struct dma_client *client, struct dma_chan *chan, | |
3933 | enum dma_state state) | |
3934 | { | |
3935 | int i, found = 0, pos = -1; | |
3936 | struct net_dma *net_dma = | |
3937 | container_of(client, struct net_dma, client); | |
3938 | enum dma_state_client ack = DMA_DUP; /* default: take no action */ | |
3939 | ||
3940 | spin_lock(&net_dma->lock); | |
3941 | switch (state) { | |
3942 | case DMA_RESOURCE_AVAILABLE: | |
3943 | for (i = 0; i < NR_CPUS; i++) | |
3944 | if (net_dma->channels[i] == chan) { | |
3945 | found = 1; | |
3946 | break; | |
3947 | } else if (net_dma->channels[i] == NULL && pos < 0) | |
3948 | pos = i; | |
3949 | ||
3950 | if (!found && pos >= 0) { | |
3951 | ack = DMA_ACK; | |
3952 | net_dma->channels[pos] = chan; | |
3953 | cpu_set(pos, net_dma->channel_mask); | |
3954 | net_dma_rebalance(net_dma); | |
3955 | } | |
db217334 CL |
3956 | break; |
3957 | case DMA_RESOURCE_REMOVED: | |
d379b01e DW |
3958 | for (i = 0; i < NR_CPUS; i++) |
3959 | if (net_dma->channels[i] == chan) { | |
3960 | found = 1; | |
3961 | pos = i; | |
3962 | break; | |
3963 | } | |
3964 | ||
3965 | if (found) { | |
3966 | ack = DMA_ACK; | |
3967 | cpu_clear(pos, net_dma->channel_mask); | |
3968 | net_dma->channels[i] = NULL; | |
3969 | net_dma_rebalance(net_dma); | |
3970 | } | |
db217334 CL |
3971 | break; |
3972 | default: | |
3973 | break; | |
3974 | } | |
d379b01e DW |
3975 | spin_unlock(&net_dma->lock); |
3976 | ||
3977 | return ack; | |
db217334 CL |
3978 | } |
3979 | ||
3980 | /** | |
3981 | * netdev_dma_regiser - register the networking subsystem as a DMA client | |
3982 | */ | |
3983 | static int __init netdev_dma_register(void) | |
3984 | { | |
d379b01e DW |
3985 | spin_lock_init(&net_dma.lock); |
3986 | dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask); | |
3987 | dma_async_client_register(&net_dma.client); | |
3988 | dma_async_client_chan_request(&net_dma.client); | |
db217334 CL |
3989 | return 0; |
3990 | } | |
3991 | ||
3992 | #else | |
3993 | static int __init netdev_dma_register(void) { return -ENODEV; } | |
3994 | #endif /* CONFIG_NET_DMA */ | |
1da177e4 LT |
3995 | |
3996 | /* | |
3997 | * Initialize the DEV module. At boot time this walks the device list and | |
3998 | * unhooks any devices that fail to initialise (normally hardware not | |
3999 | * present) and leaves us with a valid list of present and active devices. | |
4000 | * | |
4001 | */ | |
4002 | ||
4003 | /* | |
4004 | * This is called single threaded during boot, so no need | |
4005 | * to take the rtnl semaphore. | |
4006 | */ | |
4007 | static int __init net_dev_init(void) | |
4008 | { | |
4009 | int i, rc = -ENOMEM; | |
4010 | ||
4011 | BUG_ON(!dev_boot_phase); | |
4012 | ||
1da177e4 LT |
4013 | if (dev_proc_init()) |
4014 | goto out; | |
4015 | ||
4016 | if (netdev_sysfs_init()) | |
4017 | goto out; | |
4018 | ||
4019 | INIT_LIST_HEAD(&ptype_all); | |
4ec93edb | 4020 | for (i = 0; i < 16; i++) |
1da177e4 LT |
4021 | INIT_LIST_HEAD(&ptype_base[i]); |
4022 | ||
4023 | for (i = 0; i < ARRAY_SIZE(dev_name_head); i++) | |
4024 | INIT_HLIST_HEAD(&dev_name_head[i]); | |
4025 | ||
4026 | for (i = 0; i < ARRAY_SIZE(dev_index_head); i++) | |
4027 | INIT_HLIST_HEAD(&dev_index_head[i]); | |
4028 | ||
4029 | /* | |
4030 | * Initialise the packet receive queues. | |
4031 | */ | |
4032 | ||
6f912042 | 4033 | for_each_possible_cpu(i) { |
1da177e4 LT |
4034 | struct softnet_data *queue; |
4035 | ||
4036 | queue = &per_cpu(softnet_data, i); | |
4037 | skb_queue_head_init(&queue->input_pkt_queue); | |
1da177e4 LT |
4038 | queue->completion_queue = NULL; |
4039 | INIT_LIST_HEAD(&queue->poll_list); | |
4040 | set_bit(__LINK_STATE_START, &queue->backlog_dev.state); | |
4041 | queue->backlog_dev.weight = weight_p; | |
4042 | queue->backlog_dev.poll = process_backlog; | |
4043 | atomic_set(&queue->backlog_dev.refcnt, 1); | |
4044 | } | |
4045 | ||
db217334 CL |
4046 | netdev_dma_register(); |
4047 | ||
1da177e4 LT |
4048 | dev_boot_phase = 0; |
4049 | ||
4050 | open_softirq(NET_TX_SOFTIRQ, net_tx_action, NULL); | |
4051 | open_softirq(NET_RX_SOFTIRQ, net_rx_action, NULL); | |
4052 | ||
4053 | hotcpu_notifier(dev_cpu_callback, 0); | |
4054 | dst_init(); | |
4055 | dev_mcast_init(); | |
4056 | rc = 0; | |
4057 | out: | |
4058 | return rc; | |
4059 | } | |
4060 | ||
4061 | subsys_initcall(net_dev_init); | |
4062 | ||
4063 | EXPORT_SYMBOL(__dev_get_by_index); | |
4064 | EXPORT_SYMBOL(__dev_get_by_name); | |
4065 | EXPORT_SYMBOL(__dev_remove_pack); | |
c2373ee9 | 4066 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
4067 | EXPORT_SYMBOL(dev_add_pack); |
4068 | EXPORT_SYMBOL(dev_alloc_name); | |
4069 | EXPORT_SYMBOL(dev_close); | |
4070 | EXPORT_SYMBOL(dev_get_by_flags); | |
4071 | EXPORT_SYMBOL(dev_get_by_index); | |
4072 | EXPORT_SYMBOL(dev_get_by_name); | |
1da177e4 LT |
4073 | EXPORT_SYMBOL(dev_open); |
4074 | EXPORT_SYMBOL(dev_queue_xmit); | |
4075 | EXPORT_SYMBOL(dev_remove_pack); | |
4076 | EXPORT_SYMBOL(dev_set_allmulti); | |
4077 | EXPORT_SYMBOL(dev_set_promiscuity); | |
4078 | EXPORT_SYMBOL(dev_change_flags); | |
4079 | EXPORT_SYMBOL(dev_set_mtu); | |
4080 | EXPORT_SYMBOL(dev_set_mac_address); | |
4081 | EXPORT_SYMBOL(free_netdev); | |
4082 | EXPORT_SYMBOL(netdev_boot_setup_check); | |
4083 | EXPORT_SYMBOL(netdev_set_master); | |
4084 | EXPORT_SYMBOL(netdev_state_change); | |
4085 | EXPORT_SYMBOL(netif_receive_skb); | |
4086 | EXPORT_SYMBOL(netif_rx); | |
4087 | EXPORT_SYMBOL(register_gifconf); | |
4088 | EXPORT_SYMBOL(register_netdevice); | |
4089 | EXPORT_SYMBOL(register_netdevice_notifier); | |
4090 | EXPORT_SYMBOL(skb_checksum_help); | |
4091 | EXPORT_SYMBOL(synchronize_net); | |
4092 | EXPORT_SYMBOL(unregister_netdevice); | |
4093 | EXPORT_SYMBOL(unregister_netdevice_notifier); | |
4094 | EXPORT_SYMBOL(net_enable_timestamp); | |
4095 | EXPORT_SYMBOL(net_disable_timestamp); | |
4096 | EXPORT_SYMBOL(dev_get_flags); | |
4097 | ||
4098 | #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) | |
4099 | EXPORT_SYMBOL(br_handle_frame_hook); | |
4100 | EXPORT_SYMBOL(br_fdb_get_hook); | |
4101 | EXPORT_SYMBOL(br_fdb_put_hook); | |
4102 | #endif | |
4103 | ||
4104 | #ifdef CONFIG_KMOD | |
4105 | EXPORT_SYMBOL(dev_load); | |
4106 | #endif | |
4107 | ||
4108 | EXPORT_PER_CPU_SYMBOL(softnet_data); |