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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> | |
0187bdfb | 93 | #include <linux/ethtool.h> |
1da177e4 LT |
94 | #include <linux/notifier.h> |
95 | #include <linux/skbuff.h> | |
457c4cbc | 96 | #include <net/net_namespace.h> |
1da177e4 LT |
97 | #include <net/sock.h> |
98 | #include <linux/rtnetlink.h> | |
99 | #include <linux/proc_fs.h> | |
100 | #include <linux/seq_file.h> | |
101 | #include <linux/stat.h> | |
102 | #include <linux/if_bridge.h> | |
b863ceb7 | 103 | #include <linux/if_macvlan.h> |
1da177e4 LT |
104 | #include <net/dst.h> |
105 | #include <net/pkt_sched.h> | |
106 | #include <net/checksum.h> | |
107 | #include <linux/highmem.h> | |
108 | #include <linux/init.h> | |
109 | #include <linux/kmod.h> | |
110 | #include <linux/module.h> | |
111 | #include <linux/kallsyms.h> | |
112 | #include <linux/netpoll.h> | |
113 | #include <linux/rcupdate.h> | |
114 | #include <linux/delay.h> | |
295f4a1f | 115 | #include <net/wext.h> |
1da177e4 | 116 | #include <net/iw_handler.h> |
1da177e4 | 117 | #include <asm/current.h> |
5bdb9886 | 118 | #include <linux/audit.h> |
db217334 | 119 | #include <linux/dmaengine.h> |
f6a78bfc | 120 | #include <linux/err.h> |
c7fa9d18 | 121 | #include <linux/ctype.h> |
723e98b7 | 122 | #include <linux/if_arp.h> |
6de329e2 | 123 | #include <linux/if_vlan.h> |
8f0f2223 | 124 | #include <linux/ip.h> |
ad55dcaf | 125 | #include <net/ip.h> |
8f0f2223 DM |
126 | #include <linux/ipv6.h> |
127 | #include <linux/in.h> | |
b6b2fed1 DM |
128 | #include <linux/jhash.h> |
129 | #include <linux/random.h> | |
1da177e4 | 130 | |
342709ef PE |
131 | #include "net-sysfs.h" |
132 | ||
1da177e4 LT |
133 | /* |
134 | * The list of packet types we will receive (as opposed to discard) | |
135 | * and the routines to invoke. | |
136 | * | |
137 | * Why 16. Because with 16 the only overlap we get on a hash of the | |
138 | * low nibble of the protocol value is RARP/SNAP/X.25. | |
139 | * | |
140 | * NOTE: That is no longer true with the addition of VLAN tags. Not | |
141 | * sure which should go first, but I bet it won't make much | |
142 | * difference if we are running VLANs. The good news is that | |
143 | * this protocol won't be in the list unless compiled in, so | |
3041a069 | 144 | * the average user (w/out VLANs) will not be adversely affected. |
1da177e4 LT |
145 | * --BLG |
146 | * | |
147 | * 0800 IP | |
148 | * 8100 802.1Q VLAN | |
149 | * 0001 802.3 | |
150 | * 0002 AX.25 | |
151 | * 0004 802.2 | |
152 | * 8035 RARP | |
153 | * 0005 SNAP | |
154 | * 0805 X.25 | |
155 | * 0806 ARP | |
156 | * 8137 IPX | |
157 | * 0009 Localtalk | |
158 | * 86DD IPv6 | |
159 | */ | |
160 | ||
82d8a867 PE |
161 | #define PTYPE_HASH_SIZE (16) |
162 | #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) | |
163 | ||
1da177e4 | 164 | static DEFINE_SPINLOCK(ptype_lock); |
82d8a867 | 165 | static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
6b2bedc3 | 166 | static struct list_head ptype_all __read_mostly; /* Taps */ |
1da177e4 | 167 | |
db217334 | 168 | #ifdef CONFIG_NET_DMA |
d379b01e DW |
169 | struct net_dma { |
170 | struct dma_client client; | |
171 | spinlock_t lock; | |
172 | cpumask_t channel_mask; | |
0c0b0aca | 173 | struct dma_chan **channels; |
d379b01e DW |
174 | }; |
175 | ||
176 | static enum dma_state_client | |
177 | netdev_dma_event(struct dma_client *client, struct dma_chan *chan, | |
178 | enum dma_state state); | |
179 | ||
180 | static struct net_dma net_dma = { | |
181 | .client = { | |
182 | .event_callback = netdev_dma_event, | |
183 | }, | |
184 | }; | |
db217334 CL |
185 | #endif |
186 | ||
1da177e4 | 187 | /* |
7562f876 | 188 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
189 | * semaphore. |
190 | * | |
191 | * Pure readers hold dev_base_lock for reading. | |
192 | * | |
193 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 194 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
195 | * actual updates. This allows pure readers to access the list even |
196 | * while a writer is preparing to update it. | |
197 | * | |
198 | * To put it another way, dev_base_lock is held for writing only to | |
199 | * protect against pure readers; the rtnl semaphore provides the | |
200 | * protection against other writers. | |
201 | * | |
202 | * See, for example usages, register_netdevice() and | |
203 | * unregister_netdevice(), which must be called with the rtnl | |
204 | * semaphore held. | |
205 | */ | |
1da177e4 LT |
206 | DEFINE_RWLOCK(dev_base_lock); |
207 | ||
1da177e4 LT |
208 | EXPORT_SYMBOL(dev_base_lock); |
209 | ||
210 | #define NETDEV_HASHBITS 8 | |
881d966b | 211 | #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) |
1da177e4 | 212 | |
881d966b | 213 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
1da177e4 LT |
214 | { |
215 | unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); | |
881d966b | 216 | return &net->dev_name_head[hash & ((1 << NETDEV_HASHBITS) - 1)]; |
1da177e4 LT |
217 | } |
218 | ||
881d966b | 219 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
1da177e4 | 220 | { |
881d966b | 221 | return &net->dev_index_head[ifindex & ((1 << NETDEV_HASHBITS) - 1)]; |
1da177e4 LT |
222 | } |
223 | ||
ce286d32 EB |
224 | /* Device list insertion */ |
225 | static int list_netdevice(struct net_device *dev) | |
226 | { | |
c346dca1 | 227 | struct net *net = dev_net(dev); |
ce286d32 EB |
228 | |
229 | ASSERT_RTNL(); | |
230 | ||
231 | write_lock_bh(&dev_base_lock); | |
232 | list_add_tail(&dev->dev_list, &net->dev_base_head); | |
233 | hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name)); | |
234 | hlist_add_head(&dev->index_hlist, dev_index_hash(net, dev->ifindex)); | |
235 | write_unlock_bh(&dev_base_lock); | |
236 | return 0; | |
237 | } | |
238 | ||
239 | /* Device list removal */ | |
240 | static void unlist_netdevice(struct net_device *dev) | |
241 | { | |
242 | ASSERT_RTNL(); | |
243 | ||
244 | /* Unlink dev from the device chain */ | |
245 | write_lock_bh(&dev_base_lock); | |
246 | list_del(&dev->dev_list); | |
247 | hlist_del(&dev->name_hlist); | |
248 | hlist_del(&dev->index_hlist); | |
249 | write_unlock_bh(&dev_base_lock); | |
250 | } | |
251 | ||
1da177e4 LT |
252 | /* |
253 | * Our notifier list | |
254 | */ | |
255 | ||
f07d5b94 | 256 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
257 | |
258 | /* | |
259 | * Device drivers call our routines to queue packets here. We empty the | |
260 | * queue in the local softnet handler. | |
261 | */ | |
bea3348e SH |
262 | |
263 | DEFINE_PER_CPU(struct softnet_data, softnet_data); | |
1da177e4 | 264 | |
cf508b12 | 265 | #ifdef CONFIG_LOCKDEP |
723e98b7 | 266 | /* |
c773e847 | 267 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
723e98b7 JP |
268 | * according to dev->type |
269 | */ | |
270 | static const unsigned short netdev_lock_type[] = | |
271 | {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, | |
272 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, | |
273 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, | |
274 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, | |
275 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, | |
276 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, | |
277 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, | |
278 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, | |
279 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, | |
280 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, | |
281 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, | |
282 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, | |
283 | ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211, | |
284 | ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_VOID, | |
285 | ARPHRD_NONE}; | |
286 | ||
287 | static const char *netdev_lock_name[] = | |
288 | {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", | |
289 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", | |
290 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", | |
291 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", | |
292 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", | |
293 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", | |
294 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", | |
295 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", | |
296 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", | |
297 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", | |
298 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", | |
299 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", | |
300 | "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211", | |
301 | "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_VOID", | |
302 | "_xmit_NONE"}; | |
303 | ||
304 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; | |
cf508b12 | 305 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
723e98b7 JP |
306 | |
307 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) | |
308 | { | |
309 | int i; | |
310 | ||
311 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) | |
312 | if (netdev_lock_type[i] == dev_type) | |
313 | return i; | |
314 | /* the last key is used by default */ | |
315 | return ARRAY_SIZE(netdev_lock_type) - 1; | |
316 | } | |
317 | ||
cf508b12 DM |
318 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
319 | unsigned short dev_type) | |
723e98b7 JP |
320 | { |
321 | int i; | |
322 | ||
323 | i = netdev_lock_pos(dev_type); | |
324 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], | |
325 | netdev_lock_name[i]); | |
326 | } | |
cf508b12 DM |
327 | |
328 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
329 | { | |
330 | int i; | |
331 | ||
332 | i = netdev_lock_pos(dev->type); | |
333 | lockdep_set_class_and_name(&dev->addr_list_lock, | |
334 | &netdev_addr_lock_key[i], | |
335 | netdev_lock_name[i]); | |
336 | } | |
723e98b7 | 337 | #else |
cf508b12 DM |
338 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
339 | unsigned short dev_type) | |
340 | { | |
341 | } | |
342 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
723e98b7 JP |
343 | { |
344 | } | |
345 | #endif | |
1da177e4 LT |
346 | |
347 | /******************************************************************************* | |
348 | ||
349 | Protocol management and registration routines | |
350 | ||
351 | *******************************************************************************/ | |
352 | ||
1da177e4 LT |
353 | /* |
354 | * Add a protocol ID to the list. Now that the input handler is | |
355 | * smarter we can dispense with all the messy stuff that used to be | |
356 | * here. | |
357 | * | |
358 | * BEWARE!!! Protocol handlers, mangling input packets, | |
359 | * MUST BE last in hash buckets and checking protocol handlers | |
360 | * MUST start from promiscuous ptype_all chain in net_bh. | |
361 | * It is true now, do not change it. | |
362 | * Explanation follows: if protocol handler, mangling packet, will | |
363 | * be the first on list, it is not able to sense, that packet | |
364 | * is cloned and should be copied-on-write, so that it will | |
365 | * change it and subsequent readers will get broken packet. | |
366 | * --ANK (980803) | |
367 | */ | |
368 | ||
369 | /** | |
370 | * dev_add_pack - add packet handler | |
371 | * @pt: packet type declaration | |
372 | * | |
373 | * Add a protocol handler to the networking stack. The passed &packet_type | |
374 | * is linked into kernel lists and may not be freed until it has been | |
375 | * removed from the kernel lists. | |
376 | * | |
4ec93edb | 377 | * This call does not sleep therefore it can not |
1da177e4 LT |
378 | * guarantee all CPU's that are in middle of receiving packets |
379 | * will see the new packet type (until the next received packet). | |
380 | */ | |
381 | ||
382 | void dev_add_pack(struct packet_type *pt) | |
383 | { | |
384 | int hash; | |
385 | ||
386 | spin_lock_bh(&ptype_lock); | |
9be9a6b9 | 387 | if (pt->type == htons(ETH_P_ALL)) |
1da177e4 | 388 | list_add_rcu(&pt->list, &ptype_all); |
9be9a6b9 | 389 | else { |
82d8a867 | 390 | hash = ntohs(pt->type) & PTYPE_HASH_MASK; |
1da177e4 LT |
391 | list_add_rcu(&pt->list, &ptype_base[hash]); |
392 | } | |
393 | spin_unlock_bh(&ptype_lock); | |
394 | } | |
395 | ||
1da177e4 LT |
396 | /** |
397 | * __dev_remove_pack - remove packet handler | |
398 | * @pt: packet type declaration | |
399 | * | |
400 | * Remove a protocol handler that was previously added to the kernel | |
401 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
402 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 403 | * returns. |
1da177e4 LT |
404 | * |
405 | * The packet type might still be in use by receivers | |
406 | * and must not be freed until after all the CPU's have gone | |
407 | * through a quiescent state. | |
408 | */ | |
409 | void __dev_remove_pack(struct packet_type *pt) | |
410 | { | |
411 | struct list_head *head; | |
412 | struct packet_type *pt1; | |
413 | ||
414 | spin_lock_bh(&ptype_lock); | |
415 | ||
9be9a6b9 | 416 | if (pt->type == htons(ETH_P_ALL)) |
1da177e4 | 417 | head = &ptype_all; |
9be9a6b9 | 418 | else |
82d8a867 | 419 | head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; |
1da177e4 LT |
420 | |
421 | list_for_each_entry(pt1, head, list) { | |
422 | if (pt == pt1) { | |
423 | list_del_rcu(&pt->list); | |
424 | goto out; | |
425 | } | |
426 | } | |
427 | ||
428 | printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt); | |
429 | out: | |
430 | spin_unlock_bh(&ptype_lock); | |
431 | } | |
432 | /** | |
433 | * dev_remove_pack - remove packet handler | |
434 | * @pt: packet type declaration | |
435 | * | |
436 | * Remove a protocol handler that was previously added to the kernel | |
437 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
438 | * from the kernel lists and can be freed or reused once this function | |
439 | * returns. | |
440 | * | |
441 | * This call sleeps to guarantee that no CPU is looking at the packet | |
442 | * type after return. | |
443 | */ | |
444 | void dev_remove_pack(struct packet_type *pt) | |
445 | { | |
446 | __dev_remove_pack(pt); | |
4ec93edb | 447 | |
1da177e4 LT |
448 | synchronize_net(); |
449 | } | |
450 | ||
451 | /****************************************************************************** | |
452 | ||
453 | Device Boot-time Settings Routines | |
454 | ||
455 | *******************************************************************************/ | |
456 | ||
457 | /* Boot time configuration table */ | |
458 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
459 | ||
460 | /** | |
461 | * netdev_boot_setup_add - add new setup entry | |
462 | * @name: name of the device | |
463 | * @map: configured settings for the device | |
464 | * | |
465 | * Adds new setup entry to the dev_boot_setup list. The function | |
466 | * returns 0 on error and 1 on success. This is a generic routine to | |
467 | * all netdevices. | |
468 | */ | |
469 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
470 | { | |
471 | struct netdev_boot_setup *s; | |
472 | int i; | |
473 | ||
474 | s = dev_boot_setup; | |
475 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
476 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
477 | memset(s[i].name, 0, sizeof(s[i].name)); | |
93b3cff9 | 478 | strlcpy(s[i].name, name, IFNAMSIZ); |
1da177e4 LT |
479 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
480 | break; | |
481 | } | |
482 | } | |
483 | ||
484 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
485 | } | |
486 | ||
487 | /** | |
488 | * netdev_boot_setup_check - check boot time settings | |
489 | * @dev: the netdevice | |
490 | * | |
491 | * Check boot time settings for the device. | |
492 | * The found settings are set for the device to be used | |
493 | * later in the device probing. | |
494 | * Returns 0 if no settings found, 1 if they are. | |
495 | */ | |
496 | int netdev_boot_setup_check(struct net_device *dev) | |
497 | { | |
498 | struct netdev_boot_setup *s = dev_boot_setup; | |
499 | int i; | |
500 | ||
501 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
502 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
93b3cff9 | 503 | !strcmp(dev->name, s[i].name)) { |
1da177e4 LT |
504 | dev->irq = s[i].map.irq; |
505 | dev->base_addr = s[i].map.base_addr; | |
506 | dev->mem_start = s[i].map.mem_start; | |
507 | dev->mem_end = s[i].map.mem_end; | |
508 | return 1; | |
509 | } | |
510 | } | |
511 | return 0; | |
512 | } | |
513 | ||
514 | ||
515 | /** | |
516 | * netdev_boot_base - get address from boot time settings | |
517 | * @prefix: prefix for network device | |
518 | * @unit: id for network device | |
519 | * | |
520 | * Check boot time settings for the base address of device. | |
521 | * The found settings are set for the device to be used | |
522 | * later in the device probing. | |
523 | * Returns 0 if no settings found. | |
524 | */ | |
525 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
526 | { | |
527 | const struct netdev_boot_setup *s = dev_boot_setup; | |
528 | char name[IFNAMSIZ]; | |
529 | int i; | |
530 | ||
531 | sprintf(name, "%s%d", prefix, unit); | |
532 | ||
533 | /* | |
534 | * If device already registered then return base of 1 | |
535 | * to indicate not to probe for this interface | |
536 | */ | |
881d966b | 537 | if (__dev_get_by_name(&init_net, name)) |
1da177e4 LT |
538 | return 1; |
539 | ||
540 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
541 | if (!strcmp(name, s[i].name)) | |
542 | return s[i].map.base_addr; | |
543 | return 0; | |
544 | } | |
545 | ||
546 | /* | |
547 | * Saves at boot time configured settings for any netdevice. | |
548 | */ | |
549 | int __init netdev_boot_setup(char *str) | |
550 | { | |
551 | int ints[5]; | |
552 | struct ifmap map; | |
553 | ||
554 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
555 | if (!str || !*str) | |
556 | return 0; | |
557 | ||
558 | /* Save settings */ | |
559 | memset(&map, 0, sizeof(map)); | |
560 | if (ints[0] > 0) | |
561 | map.irq = ints[1]; | |
562 | if (ints[0] > 1) | |
563 | map.base_addr = ints[2]; | |
564 | if (ints[0] > 2) | |
565 | map.mem_start = ints[3]; | |
566 | if (ints[0] > 3) | |
567 | map.mem_end = ints[4]; | |
568 | ||
569 | /* Add new entry to the list */ | |
570 | return netdev_boot_setup_add(str, &map); | |
571 | } | |
572 | ||
573 | __setup("netdev=", netdev_boot_setup); | |
574 | ||
575 | /******************************************************************************* | |
576 | ||
577 | Device Interface Subroutines | |
578 | ||
579 | *******************************************************************************/ | |
580 | ||
581 | /** | |
582 | * __dev_get_by_name - find a device by its name | |
c4ea43c5 | 583 | * @net: the applicable net namespace |
1da177e4 LT |
584 | * @name: name to find |
585 | * | |
586 | * Find an interface by name. Must be called under RTNL semaphore | |
587 | * or @dev_base_lock. If the name is found a pointer to the device | |
588 | * is returned. If the name is not found then %NULL is returned. The | |
589 | * reference counters are not incremented so the caller must be | |
590 | * careful with locks. | |
591 | */ | |
592 | ||
881d966b | 593 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
594 | { |
595 | struct hlist_node *p; | |
596 | ||
881d966b | 597 | hlist_for_each(p, dev_name_hash(net, name)) { |
1da177e4 LT |
598 | struct net_device *dev |
599 | = hlist_entry(p, struct net_device, name_hlist); | |
600 | if (!strncmp(dev->name, name, IFNAMSIZ)) | |
601 | return dev; | |
602 | } | |
603 | return NULL; | |
604 | } | |
605 | ||
606 | /** | |
607 | * dev_get_by_name - find a device by its name | |
c4ea43c5 | 608 | * @net: the applicable net namespace |
1da177e4 LT |
609 | * @name: name to find |
610 | * | |
611 | * Find an interface by name. This can be called from any | |
612 | * context and does its own locking. The returned handle has | |
613 | * the usage count incremented and the caller must use dev_put() to | |
614 | * release it when it is no longer needed. %NULL is returned if no | |
615 | * matching device is found. | |
616 | */ | |
617 | ||
881d966b | 618 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
619 | { |
620 | struct net_device *dev; | |
621 | ||
622 | read_lock(&dev_base_lock); | |
881d966b | 623 | dev = __dev_get_by_name(net, name); |
1da177e4 LT |
624 | if (dev) |
625 | dev_hold(dev); | |
626 | read_unlock(&dev_base_lock); | |
627 | return dev; | |
628 | } | |
629 | ||
630 | /** | |
631 | * __dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 632 | * @net: the applicable net namespace |
1da177e4 LT |
633 | * @ifindex: index of device |
634 | * | |
635 | * Search for an interface by index. Returns %NULL if the device | |
636 | * is not found or a pointer to the device. The device has not | |
637 | * had its reference counter increased so the caller must be careful | |
638 | * about locking. The caller must hold either the RTNL semaphore | |
639 | * or @dev_base_lock. | |
640 | */ | |
641 | ||
881d966b | 642 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
643 | { |
644 | struct hlist_node *p; | |
645 | ||
881d966b | 646 | hlist_for_each(p, dev_index_hash(net, ifindex)) { |
1da177e4 LT |
647 | struct net_device *dev |
648 | = hlist_entry(p, struct net_device, index_hlist); | |
649 | if (dev->ifindex == ifindex) | |
650 | return dev; | |
651 | } | |
652 | return NULL; | |
653 | } | |
654 | ||
655 | ||
656 | /** | |
657 | * dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 658 | * @net: the applicable net namespace |
1da177e4 LT |
659 | * @ifindex: index of device |
660 | * | |
661 | * Search for an interface by index. Returns NULL if the device | |
662 | * is not found or a pointer to the device. The device returned has | |
663 | * had a reference added and the pointer is safe until the user calls | |
664 | * dev_put to indicate they have finished with it. | |
665 | */ | |
666 | ||
881d966b | 667 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
668 | { |
669 | struct net_device *dev; | |
670 | ||
671 | read_lock(&dev_base_lock); | |
881d966b | 672 | dev = __dev_get_by_index(net, ifindex); |
1da177e4 LT |
673 | if (dev) |
674 | dev_hold(dev); | |
675 | read_unlock(&dev_base_lock); | |
676 | return dev; | |
677 | } | |
678 | ||
679 | /** | |
680 | * dev_getbyhwaddr - find a device by its hardware address | |
c4ea43c5 | 681 | * @net: the applicable net namespace |
1da177e4 LT |
682 | * @type: media type of device |
683 | * @ha: hardware address | |
684 | * | |
685 | * Search for an interface by MAC address. Returns NULL if the device | |
686 | * is not found or a pointer to the device. The caller must hold the | |
687 | * rtnl semaphore. The returned device has not had its ref count increased | |
688 | * and the caller must therefore be careful about locking | |
689 | * | |
690 | * BUGS: | |
691 | * If the API was consistent this would be __dev_get_by_hwaddr | |
692 | */ | |
693 | ||
881d966b | 694 | struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha) |
1da177e4 LT |
695 | { |
696 | struct net_device *dev; | |
697 | ||
698 | ASSERT_RTNL(); | |
699 | ||
81103a52 | 700 | for_each_netdev(net, dev) |
1da177e4 LT |
701 | if (dev->type == type && |
702 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
703 | return dev; |
704 | ||
705 | return NULL; | |
1da177e4 LT |
706 | } |
707 | ||
cf309e3f JF |
708 | EXPORT_SYMBOL(dev_getbyhwaddr); |
709 | ||
881d966b | 710 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
1da177e4 LT |
711 | { |
712 | struct net_device *dev; | |
713 | ||
4e9cac2b | 714 | ASSERT_RTNL(); |
881d966b | 715 | for_each_netdev(net, dev) |
4e9cac2b | 716 | if (dev->type == type) |
7562f876 PE |
717 | return dev; |
718 | ||
719 | return NULL; | |
4e9cac2b PM |
720 | } |
721 | ||
722 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); | |
723 | ||
881d966b | 724 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
4e9cac2b PM |
725 | { |
726 | struct net_device *dev; | |
727 | ||
728 | rtnl_lock(); | |
881d966b | 729 | dev = __dev_getfirstbyhwtype(net, type); |
4e9cac2b PM |
730 | if (dev) |
731 | dev_hold(dev); | |
1da177e4 LT |
732 | rtnl_unlock(); |
733 | return dev; | |
734 | } | |
735 | ||
736 | EXPORT_SYMBOL(dev_getfirstbyhwtype); | |
737 | ||
738 | /** | |
739 | * dev_get_by_flags - find any device with given flags | |
c4ea43c5 | 740 | * @net: the applicable net namespace |
1da177e4 LT |
741 | * @if_flags: IFF_* values |
742 | * @mask: bitmask of bits in if_flags to check | |
743 | * | |
744 | * Search for any interface with the given flags. Returns NULL if a device | |
4ec93edb | 745 | * is not found or a pointer to the device. The device returned has |
1da177e4 LT |
746 | * had a reference added and the pointer is safe until the user calls |
747 | * dev_put to indicate they have finished with it. | |
748 | */ | |
749 | ||
881d966b | 750 | struct net_device * dev_get_by_flags(struct net *net, unsigned short if_flags, unsigned short mask) |
1da177e4 | 751 | { |
7562f876 | 752 | struct net_device *dev, *ret; |
1da177e4 | 753 | |
7562f876 | 754 | ret = NULL; |
1da177e4 | 755 | read_lock(&dev_base_lock); |
881d966b | 756 | for_each_netdev(net, dev) { |
1da177e4 LT |
757 | if (((dev->flags ^ if_flags) & mask) == 0) { |
758 | dev_hold(dev); | |
7562f876 | 759 | ret = dev; |
1da177e4 LT |
760 | break; |
761 | } | |
762 | } | |
763 | read_unlock(&dev_base_lock); | |
7562f876 | 764 | return ret; |
1da177e4 LT |
765 | } |
766 | ||
767 | /** | |
768 | * dev_valid_name - check if name is okay for network device | |
769 | * @name: name string | |
770 | * | |
771 | * Network device names need to be valid file names to | |
c7fa9d18 DM |
772 | * to allow sysfs to work. We also disallow any kind of |
773 | * whitespace. | |
1da177e4 | 774 | */ |
c2373ee9 | 775 | int dev_valid_name(const char *name) |
1da177e4 | 776 | { |
c7fa9d18 DM |
777 | if (*name == '\0') |
778 | return 0; | |
b6fe17d6 SH |
779 | if (strlen(name) >= IFNAMSIZ) |
780 | return 0; | |
c7fa9d18 DM |
781 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
782 | return 0; | |
783 | ||
784 | while (*name) { | |
785 | if (*name == '/' || isspace(*name)) | |
786 | return 0; | |
787 | name++; | |
788 | } | |
789 | return 1; | |
1da177e4 LT |
790 | } |
791 | ||
792 | /** | |
b267b179 EB |
793 | * __dev_alloc_name - allocate a name for a device |
794 | * @net: network namespace to allocate the device name in | |
1da177e4 | 795 | * @name: name format string |
b267b179 | 796 | * @buf: scratch buffer and result name string |
1da177e4 LT |
797 | * |
798 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
799 | * id. It scans list of devices to build up a free map, then chooses |
800 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
801 | * while allocating the name and adding the device in order to avoid | |
802 | * duplicates. | |
803 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
804 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
805 | */ |
806 | ||
b267b179 | 807 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
1da177e4 LT |
808 | { |
809 | int i = 0; | |
1da177e4 LT |
810 | const char *p; |
811 | const int max_netdevices = 8*PAGE_SIZE; | |
cfcabdcc | 812 | unsigned long *inuse; |
1da177e4 LT |
813 | struct net_device *d; |
814 | ||
815 | p = strnchr(name, IFNAMSIZ-1, '%'); | |
816 | if (p) { | |
817 | /* | |
818 | * Verify the string as this thing may have come from | |
819 | * the user. There must be either one "%d" and no other "%" | |
820 | * characters. | |
821 | */ | |
822 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
823 | return -EINVAL; | |
824 | ||
825 | /* Use one page as a bit array of possible slots */ | |
cfcabdcc | 826 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
827 | if (!inuse) |
828 | return -ENOMEM; | |
829 | ||
881d966b | 830 | for_each_netdev(net, d) { |
1da177e4 LT |
831 | if (!sscanf(d->name, name, &i)) |
832 | continue; | |
833 | if (i < 0 || i >= max_netdevices) | |
834 | continue; | |
835 | ||
836 | /* avoid cases where sscanf is not exact inverse of printf */ | |
b267b179 | 837 | snprintf(buf, IFNAMSIZ, name, i); |
1da177e4 LT |
838 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
839 | set_bit(i, inuse); | |
840 | } | |
841 | ||
842 | i = find_first_zero_bit(inuse, max_netdevices); | |
843 | free_page((unsigned long) inuse); | |
844 | } | |
845 | ||
b267b179 EB |
846 | snprintf(buf, IFNAMSIZ, name, i); |
847 | if (!__dev_get_by_name(net, buf)) | |
1da177e4 | 848 | return i; |
1da177e4 LT |
849 | |
850 | /* It is possible to run out of possible slots | |
851 | * when the name is long and there isn't enough space left | |
852 | * for the digits, or if all bits are used. | |
853 | */ | |
854 | return -ENFILE; | |
855 | } | |
856 | ||
b267b179 EB |
857 | /** |
858 | * dev_alloc_name - allocate a name for a device | |
859 | * @dev: device | |
860 | * @name: name format string | |
861 | * | |
862 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
863 | * id. It scans list of devices to build up a free map, then chooses | |
864 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
865 | * while allocating the name and adding the device in order to avoid | |
866 | * duplicates. | |
867 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
868 | * Returns the number of the unit assigned or a negative errno code. | |
869 | */ | |
870 | ||
871 | int dev_alloc_name(struct net_device *dev, const char *name) | |
872 | { | |
873 | char buf[IFNAMSIZ]; | |
874 | struct net *net; | |
875 | int ret; | |
876 | ||
c346dca1 YH |
877 | BUG_ON(!dev_net(dev)); |
878 | net = dev_net(dev); | |
b267b179 EB |
879 | ret = __dev_alloc_name(net, name, buf); |
880 | if (ret >= 0) | |
881 | strlcpy(dev->name, buf, IFNAMSIZ); | |
882 | return ret; | |
883 | } | |
884 | ||
1da177e4 LT |
885 | |
886 | /** | |
887 | * dev_change_name - change name of a device | |
888 | * @dev: device | |
889 | * @newname: name (or format string) must be at least IFNAMSIZ | |
890 | * | |
891 | * Change name of a device, can pass format strings "eth%d". | |
892 | * for wildcarding. | |
893 | */ | |
cf04a4c7 | 894 | int dev_change_name(struct net_device *dev, const char *newname) |
1da177e4 | 895 | { |
fcc5a03a | 896 | char oldname[IFNAMSIZ]; |
1da177e4 | 897 | int err = 0; |
fcc5a03a | 898 | int ret; |
881d966b | 899 | struct net *net; |
1da177e4 LT |
900 | |
901 | ASSERT_RTNL(); | |
c346dca1 | 902 | BUG_ON(!dev_net(dev)); |
1da177e4 | 903 | |
c346dca1 | 904 | net = dev_net(dev); |
1da177e4 LT |
905 | if (dev->flags & IFF_UP) |
906 | return -EBUSY; | |
907 | ||
908 | if (!dev_valid_name(newname)) | |
909 | return -EINVAL; | |
910 | ||
c8d90dca SH |
911 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) |
912 | return 0; | |
913 | ||
fcc5a03a HX |
914 | memcpy(oldname, dev->name, IFNAMSIZ); |
915 | ||
1da177e4 LT |
916 | if (strchr(newname, '%')) { |
917 | err = dev_alloc_name(dev, newname); | |
918 | if (err < 0) | |
919 | return err; | |
1da177e4 | 920 | } |
881d966b | 921 | else if (__dev_get_by_name(net, newname)) |
1da177e4 LT |
922 | return -EEXIST; |
923 | else | |
924 | strlcpy(dev->name, newname, IFNAMSIZ); | |
925 | ||
fcc5a03a | 926 | rollback: |
3891845e EB |
927 | /* For now only devices in the initial network namespace |
928 | * are in sysfs. | |
929 | */ | |
930 | if (net == &init_net) { | |
931 | ret = device_rename(&dev->dev, dev->name); | |
932 | if (ret) { | |
933 | memcpy(dev->name, oldname, IFNAMSIZ); | |
934 | return ret; | |
935 | } | |
dcc99773 | 936 | } |
7f988eab HX |
937 | |
938 | write_lock_bh(&dev_base_lock); | |
92749821 | 939 | hlist_del(&dev->name_hlist); |
881d966b | 940 | hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name)); |
7f988eab HX |
941 | write_unlock_bh(&dev_base_lock); |
942 | ||
056925ab | 943 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
fcc5a03a HX |
944 | ret = notifier_to_errno(ret); |
945 | ||
946 | if (ret) { | |
947 | if (err) { | |
948 | printk(KERN_ERR | |
949 | "%s: name change rollback failed: %d.\n", | |
950 | dev->name, ret); | |
951 | } else { | |
952 | err = ret; | |
953 | memcpy(dev->name, oldname, IFNAMSIZ); | |
954 | goto rollback; | |
955 | } | |
956 | } | |
1da177e4 LT |
957 | |
958 | return err; | |
959 | } | |
960 | ||
0b815a1a SH |
961 | /** |
962 | * dev_set_alias - change ifalias of a device | |
963 | * @dev: device | |
964 | * @alias: name up to IFALIASZ | |
f0db275a | 965 | * @len: limit of bytes to copy from info |
0b815a1a SH |
966 | * |
967 | * Set ifalias for a device, | |
968 | */ | |
969 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) | |
970 | { | |
971 | ASSERT_RTNL(); | |
972 | ||
973 | if (len >= IFALIASZ) | |
974 | return -EINVAL; | |
975 | ||
96ca4a2c OH |
976 | if (!len) { |
977 | if (dev->ifalias) { | |
978 | kfree(dev->ifalias); | |
979 | dev->ifalias = NULL; | |
980 | } | |
981 | return 0; | |
982 | } | |
983 | ||
0b815a1a SH |
984 | dev->ifalias = krealloc(dev->ifalias, len+1, GFP_KERNEL); |
985 | if (!dev->ifalias) | |
986 | return -ENOMEM; | |
987 | ||
988 | strlcpy(dev->ifalias, alias, len+1); | |
989 | return len; | |
990 | } | |
991 | ||
992 | ||
d8a33ac4 | 993 | /** |
3041a069 | 994 | * netdev_features_change - device changes features |
d8a33ac4 SH |
995 | * @dev: device to cause notification |
996 | * | |
997 | * Called to indicate a device has changed features. | |
998 | */ | |
999 | void netdev_features_change(struct net_device *dev) | |
1000 | { | |
056925ab | 1001 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
1002 | } |
1003 | EXPORT_SYMBOL(netdev_features_change); | |
1004 | ||
1da177e4 LT |
1005 | /** |
1006 | * netdev_state_change - device changes state | |
1007 | * @dev: device to cause notification | |
1008 | * | |
1009 | * Called to indicate a device has changed state. This function calls | |
1010 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
1011 | * to the routing socket. | |
1012 | */ | |
1013 | void netdev_state_change(struct net_device *dev) | |
1014 | { | |
1015 | if (dev->flags & IFF_UP) { | |
056925ab | 1016 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
1da177e4 LT |
1017 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); |
1018 | } | |
1019 | } | |
1020 | ||
c1da4ac7 OG |
1021 | void netdev_bonding_change(struct net_device *dev) |
1022 | { | |
1023 | call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, dev); | |
1024 | } | |
1025 | EXPORT_SYMBOL(netdev_bonding_change); | |
1026 | ||
1da177e4 LT |
1027 | /** |
1028 | * dev_load - load a network module | |
c4ea43c5 | 1029 | * @net: the applicable net namespace |
1da177e4 LT |
1030 | * @name: name of interface |
1031 | * | |
1032 | * If a network interface is not present and the process has suitable | |
1033 | * privileges this function loads the module. If module loading is not | |
1034 | * available in this kernel then it becomes a nop. | |
1035 | */ | |
1036 | ||
881d966b | 1037 | void dev_load(struct net *net, const char *name) |
1da177e4 | 1038 | { |
4ec93edb | 1039 | struct net_device *dev; |
1da177e4 LT |
1040 | |
1041 | read_lock(&dev_base_lock); | |
881d966b | 1042 | dev = __dev_get_by_name(net, name); |
1da177e4 LT |
1043 | read_unlock(&dev_base_lock); |
1044 | ||
1045 | if (!dev && capable(CAP_SYS_MODULE)) | |
1046 | request_module("%s", name); | |
1047 | } | |
1048 | ||
1da177e4 LT |
1049 | /** |
1050 | * dev_open - prepare an interface for use. | |
1051 | * @dev: device to open | |
1052 | * | |
1053 | * Takes a device from down to up state. The device's private open | |
1054 | * function is invoked and then the multicast lists are loaded. Finally | |
1055 | * the device is moved into the up state and a %NETDEV_UP message is | |
1056 | * sent to the netdev notifier chain. | |
1057 | * | |
1058 | * Calling this function on an active interface is a nop. On a failure | |
1059 | * a negative errno code is returned. | |
1060 | */ | |
1061 | int dev_open(struct net_device *dev) | |
1062 | { | |
1063 | int ret = 0; | |
1064 | ||
e46b66bc BH |
1065 | ASSERT_RTNL(); |
1066 | ||
1da177e4 LT |
1067 | /* |
1068 | * Is it already up? | |
1069 | */ | |
1070 | ||
1071 | if (dev->flags & IFF_UP) | |
1072 | return 0; | |
1073 | ||
1074 | /* | |
1075 | * Is it even present? | |
1076 | */ | |
1077 | if (!netif_device_present(dev)) | |
1078 | return -ENODEV; | |
1079 | ||
1080 | /* | |
1081 | * Call device private open method | |
1082 | */ | |
1083 | set_bit(__LINK_STATE_START, &dev->state); | |
bada339b JG |
1084 | |
1085 | if (dev->validate_addr) | |
1086 | ret = dev->validate_addr(dev); | |
1087 | ||
1088 | if (!ret && dev->open) | |
1da177e4 | 1089 | ret = dev->open(dev); |
1da177e4 | 1090 | |
4ec93edb | 1091 | /* |
1da177e4 LT |
1092 | * If it went open OK then: |
1093 | */ | |
1094 | ||
bada339b JG |
1095 | if (ret) |
1096 | clear_bit(__LINK_STATE_START, &dev->state); | |
1097 | else { | |
1da177e4 LT |
1098 | /* |
1099 | * Set the flags. | |
1100 | */ | |
1101 | dev->flags |= IFF_UP; | |
1102 | ||
1103 | /* | |
1104 | * Initialize multicasting status | |
1105 | */ | |
4417da66 | 1106 | dev_set_rx_mode(dev); |
1da177e4 LT |
1107 | |
1108 | /* | |
1109 | * Wakeup transmit queue engine | |
1110 | */ | |
1111 | dev_activate(dev); | |
1112 | ||
1113 | /* | |
1114 | * ... and announce new interface. | |
1115 | */ | |
056925ab | 1116 | call_netdevice_notifiers(NETDEV_UP, dev); |
1da177e4 | 1117 | } |
bada339b | 1118 | |
1da177e4 LT |
1119 | return ret; |
1120 | } | |
1121 | ||
1122 | /** | |
1123 | * dev_close - shutdown an interface. | |
1124 | * @dev: device to shutdown | |
1125 | * | |
1126 | * This function moves an active device into down state. A | |
1127 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1128 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1129 | * chain. | |
1130 | */ | |
1131 | int dev_close(struct net_device *dev) | |
1132 | { | |
e46b66bc BH |
1133 | ASSERT_RTNL(); |
1134 | ||
9d5010db DM |
1135 | might_sleep(); |
1136 | ||
1da177e4 LT |
1137 | if (!(dev->flags & IFF_UP)) |
1138 | return 0; | |
1139 | ||
1140 | /* | |
1141 | * Tell people we are going down, so that they can | |
1142 | * prepare to death, when device is still operating. | |
1143 | */ | |
056925ab | 1144 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
1da177e4 | 1145 | |
1da177e4 LT |
1146 | clear_bit(__LINK_STATE_START, &dev->state); |
1147 | ||
1148 | /* Synchronize to scheduled poll. We cannot touch poll list, | |
bea3348e SH |
1149 | * it can be even on different cpu. So just clear netif_running(). |
1150 | * | |
1151 | * dev->stop() will invoke napi_disable() on all of it's | |
1152 | * napi_struct instances on this device. | |
1153 | */ | |
1da177e4 | 1154 | smp_mb__after_clear_bit(); /* Commit netif_running(). */ |
1da177e4 | 1155 | |
d8b2a4d2 ML |
1156 | dev_deactivate(dev); |
1157 | ||
1da177e4 LT |
1158 | /* |
1159 | * Call the device specific close. This cannot fail. | |
1160 | * Only if device is UP | |
1161 | * | |
1162 | * We allow it to be called even after a DETACH hot-plug | |
1163 | * event. | |
1164 | */ | |
1165 | if (dev->stop) | |
1166 | dev->stop(dev); | |
1167 | ||
1168 | /* | |
1169 | * Device is now down. | |
1170 | */ | |
1171 | ||
1172 | dev->flags &= ~IFF_UP; | |
1173 | ||
1174 | /* | |
1175 | * Tell people we are down | |
1176 | */ | |
056925ab | 1177 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
1da177e4 LT |
1178 | |
1179 | return 0; | |
1180 | } | |
1181 | ||
1182 | ||
0187bdfb BH |
1183 | /** |
1184 | * dev_disable_lro - disable Large Receive Offload on a device | |
1185 | * @dev: device | |
1186 | * | |
1187 | * Disable Large Receive Offload (LRO) on a net device. Must be | |
1188 | * called under RTNL. This is needed if received packets may be | |
1189 | * forwarded to another interface. | |
1190 | */ | |
1191 | void dev_disable_lro(struct net_device *dev) | |
1192 | { | |
1193 | if (dev->ethtool_ops && dev->ethtool_ops->get_flags && | |
1194 | dev->ethtool_ops->set_flags) { | |
1195 | u32 flags = dev->ethtool_ops->get_flags(dev); | |
1196 | if (flags & ETH_FLAG_LRO) { | |
1197 | flags &= ~ETH_FLAG_LRO; | |
1198 | dev->ethtool_ops->set_flags(dev, flags); | |
1199 | } | |
1200 | } | |
1201 | WARN_ON(dev->features & NETIF_F_LRO); | |
1202 | } | |
1203 | EXPORT_SYMBOL(dev_disable_lro); | |
1204 | ||
1205 | ||
881d966b EB |
1206 | static int dev_boot_phase = 1; |
1207 | ||
1da177e4 LT |
1208 | /* |
1209 | * Device change register/unregister. These are not inline or static | |
1210 | * as we export them to the world. | |
1211 | */ | |
1212 | ||
1213 | /** | |
1214 | * register_netdevice_notifier - register a network notifier block | |
1215 | * @nb: notifier | |
1216 | * | |
1217 | * Register a notifier to be called when network device events occur. | |
1218 | * The notifier passed is linked into the kernel structures and must | |
1219 | * not be reused until it has been unregistered. A negative errno code | |
1220 | * is returned on a failure. | |
1221 | * | |
1222 | * When registered all registration and up events are replayed | |
4ec93edb | 1223 | * to the new notifier to allow device to have a race free |
1da177e4 LT |
1224 | * view of the network device list. |
1225 | */ | |
1226 | ||
1227 | int register_netdevice_notifier(struct notifier_block *nb) | |
1228 | { | |
1229 | struct net_device *dev; | |
fcc5a03a | 1230 | struct net_device *last; |
881d966b | 1231 | struct net *net; |
1da177e4 LT |
1232 | int err; |
1233 | ||
1234 | rtnl_lock(); | |
f07d5b94 | 1235 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1236 | if (err) |
1237 | goto unlock; | |
881d966b EB |
1238 | if (dev_boot_phase) |
1239 | goto unlock; | |
1240 | for_each_net(net) { | |
1241 | for_each_netdev(net, dev) { | |
1242 | err = nb->notifier_call(nb, NETDEV_REGISTER, dev); | |
1243 | err = notifier_to_errno(err); | |
1244 | if (err) | |
1245 | goto rollback; | |
1246 | ||
1247 | if (!(dev->flags & IFF_UP)) | |
1248 | continue; | |
1da177e4 | 1249 | |
881d966b EB |
1250 | nb->notifier_call(nb, NETDEV_UP, dev); |
1251 | } | |
1da177e4 | 1252 | } |
fcc5a03a HX |
1253 | |
1254 | unlock: | |
1da177e4 LT |
1255 | rtnl_unlock(); |
1256 | return err; | |
fcc5a03a HX |
1257 | |
1258 | rollback: | |
1259 | last = dev; | |
881d966b EB |
1260 | for_each_net(net) { |
1261 | for_each_netdev(net, dev) { | |
1262 | if (dev == last) | |
1263 | break; | |
fcc5a03a | 1264 | |
881d966b EB |
1265 | if (dev->flags & IFF_UP) { |
1266 | nb->notifier_call(nb, NETDEV_GOING_DOWN, dev); | |
1267 | nb->notifier_call(nb, NETDEV_DOWN, dev); | |
1268 | } | |
1269 | nb->notifier_call(nb, NETDEV_UNREGISTER, dev); | |
fcc5a03a | 1270 | } |
fcc5a03a | 1271 | } |
c67625a1 PE |
1272 | |
1273 | raw_notifier_chain_unregister(&netdev_chain, nb); | |
fcc5a03a | 1274 | goto unlock; |
1da177e4 LT |
1275 | } |
1276 | ||
1277 | /** | |
1278 | * unregister_netdevice_notifier - unregister a network notifier block | |
1279 | * @nb: notifier | |
1280 | * | |
1281 | * Unregister a notifier previously registered by | |
1282 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1283 | * kernel structures and may then be reused. A negative errno code | |
1284 | * is returned on a failure. | |
1285 | */ | |
1286 | ||
1287 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1288 | { | |
9f514950 HX |
1289 | int err; |
1290 | ||
1291 | rtnl_lock(); | |
f07d5b94 | 1292 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
9f514950 HX |
1293 | rtnl_unlock(); |
1294 | return err; | |
1da177e4 LT |
1295 | } |
1296 | ||
1297 | /** | |
1298 | * call_netdevice_notifiers - call all network notifier blocks | |
1299 | * @val: value passed unmodified to notifier function | |
c4ea43c5 | 1300 | * @dev: net_device pointer passed unmodified to notifier function |
1da177e4 LT |
1301 | * |
1302 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 1303 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
1304 | */ |
1305 | ||
ad7379d4 | 1306 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
1da177e4 | 1307 | { |
ad7379d4 | 1308 | return raw_notifier_call_chain(&netdev_chain, val, dev); |
1da177e4 LT |
1309 | } |
1310 | ||
1311 | /* When > 0 there are consumers of rx skb time stamps */ | |
1312 | static atomic_t netstamp_needed = ATOMIC_INIT(0); | |
1313 | ||
1314 | void net_enable_timestamp(void) | |
1315 | { | |
1316 | atomic_inc(&netstamp_needed); | |
1317 | } | |
1318 | ||
1319 | void net_disable_timestamp(void) | |
1320 | { | |
1321 | atomic_dec(&netstamp_needed); | |
1322 | } | |
1323 | ||
a61bbcf2 | 1324 | static inline void net_timestamp(struct sk_buff *skb) |
1da177e4 LT |
1325 | { |
1326 | if (atomic_read(&netstamp_needed)) | |
a61bbcf2 | 1327 | __net_timestamp(skb); |
b7aa0bf7 ED |
1328 | else |
1329 | skb->tstamp.tv64 = 0; | |
1da177e4 LT |
1330 | } |
1331 | ||
1332 | /* | |
1333 | * Support routine. Sends outgoing frames to any network | |
1334 | * taps currently in use. | |
1335 | */ | |
1336 | ||
f6a78bfc | 1337 | static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
1338 | { |
1339 | struct packet_type *ptype; | |
a61bbcf2 PM |
1340 | |
1341 | net_timestamp(skb); | |
1da177e4 LT |
1342 | |
1343 | rcu_read_lock(); | |
1344 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
1345 | /* Never send packets back to the socket | |
1346 | * they originated from - MvS (miquels@drinkel.ow.org) | |
1347 | */ | |
1348 | if ((ptype->dev == dev || !ptype->dev) && | |
1349 | (ptype->af_packet_priv == NULL || | |
1350 | (struct sock *)ptype->af_packet_priv != skb->sk)) { | |
1351 | struct sk_buff *skb2= skb_clone(skb, GFP_ATOMIC); | |
1352 | if (!skb2) | |
1353 | break; | |
1354 | ||
1355 | /* skb->nh should be correctly | |
1356 | set by sender, so that the second statement is | |
1357 | just protection against buggy protocols. | |
1358 | */ | |
459a98ed | 1359 | skb_reset_mac_header(skb2); |
1da177e4 | 1360 | |
d56f90a7 | 1361 | if (skb_network_header(skb2) < skb2->data || |
27a884dc | 1362 | skb2->network_header > skb2->tail) { |
1da177e4 LT |
1363 | if (net_ratelimit()) |
1364 | printk(KERN_CRIT "protocol %04x is " | |
1365 | "buggy, dev %s\n", | |
1366 | skb2->protocol, dev->name); | |
c1d2bbe1 | 1367 | skb_reset_network_header(skb2); |
1da177e4 LT |
1368 | } |
1369 | ||
b0e380b1 | 1370 | skb2->transport_header = skb2->network_header; |
1da177e4 | 1371 | skb2->pkt_type = PACKET_OUTGOING; |
f2ccd8fa | 1372 | ptype->func(skb2, skb->dev, ptype, skb->dev); |
1da177e4 LT |
1373 | } |
1374 | } | |
1375 | rcu_read_unlock(); | |
1376 | } | |
1377 | ||
56079431 | 1378 | |
def82a1d | 1379 | static inline void __netif_reschedule(struct Qdisc *q) |
56079431 | 1380 | { |
def82a1d JP |
1381 | struct softnet_data *sd; |
1382 | unsigned long flags; | |
56079431 | 1383 | |
def82a1d JP |
1384 | local_irq_save(flags); |
1385 | sd = &__get_cpu_var(softnet_data); | |
1386 | q->next_sched = sd->output_queue; | |
1387 | sd->output_queue = q; | |
1388 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
1389 | local_irq_restore(flags); | |
1390 | } | |
1391 | ||
1392 | void __netif_schedule(struct Qdisc *q) | |
1393 | { | |
1394 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) | |
1395 | __netif_reschedule(q); | |
56079431 DV |
1396 | } |
1397 | EXPORT_SYMBOL(__netif_schedule); | |
1398 | ||
bea3348e | 1399 | void dev_kfree_skb_irq(struct sk_buff *skb) |
56079431 | 1400 | { |
bea3348e SH |
1401 | if (atomic_dec_and_test(&skb->users)) { |
1402 | struct softnet_data *sd; | |
1403 | unsigned long flags; | |
56079431 | 1404 | |
bea3348e SH |
1405 | local_irq_save(flags); |
1406 | sd = &__get_cpu_var(softnet_data); | |
1407 | skb->next = sd->completion_queue; | |
1408 | sd->completion_queue = skb; | |
1409 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
1410 | local_irq_restore(flags); | |
1411 | } | |
56079431 | 1412 | } |
bea3348e | 1413 | EXPORT_SYMBOL(dev_kfree_skb_irq); |
56079431 DV |
1414 | |
1415 | void dev_kfree_skb_any(struct sk_buff *skb) | |
1416 | { | |
1417 | if (in_irq() || irqs_disabled()) | |
1418 | dev_kfree_skb_irq(skb); | |
1419 | else | |
1420 | dev_kfree_skb(skb); | |
1421 | } | |
1422 | EXPORT_SYMBOL(dev_kfree_skb_any); | |
1423 | ||
1424 | ||
bea3348e SH |
1425 | /** |
1426 | * netif_device_detach - mark device as removed | |
1427 | * @dev: network device | |
1428 | * | |
1429 | * Mark device as removed from system and therefore no longer available. | |
1430 | */ | |
56079431 DV |
1431 | void netif_device_detach(struct net_device *dev) |
1432 | { | |
1433 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
1434 | netif_running(dev)) { | |
1435 | netif_stop_queue(dev); | |
1436 | } | |
1437 | } | |
1438 | EXPORT_SYMBOL(netif_device_detach); | |
1439 | ||
bea3348e SH |
1440 | /** |
1441 | * netif_device_attach - mark device as attached | |
1442 | * @dev: network device | |
1443 | * | |
1444 | * Mark device as attached from system and restart if needed. | |
1445 | */ | |
56079431 DV |
1446 | void netif_device_attach(struct net_device *dev) |
1447 | { | |
1448 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
1449 | netif_running(dev)) { | |
1450 | netif_wake_queue(dev); | |
4ec93edb | 1451 | __netdev_watchdog_up(dev); |
56079431 DV |
1452 | } |
1453 | } | |
1454 | EXPORT_SYMBOL(netif_device_attach); | |
1455 | ||
6de329e2 BH |
1456 | static bool can_checksum_protocol(unsigned long features, __be16 protocol) |
1457 | { | |
1458 | return ((features & NETIF_F_GEN_CSUM) || | |
1459 | ((features & NETIF_F_IP_CSUM) && | |
1460 | protocol == htons(ETH_P_IP)) || | |
1461 | ((features & NETIF_F_IPV6_CSUM) && | |
1462 | protocol == htons(ETH_P_IPV6))); | |
1463 | } | |
1464 | ||
1465 | static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb) | |
1466 | { | |
1467 | if (can_checksum_protocol(dev->features, skb->protocol)) | |
1468 | return true; | |
1469 | ||
1470 | if (skb->protocol == htons(ETH_P_8021Q)) { | |
1471 | struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data; | |
1472 | if (can_checksum_protocol(dev->features & dev->vlan_features, | |
1473 | veh->h_vlan_encapsulated_proto)) | |
1474 | return true; | |
1475 | } | |
1476 | ||
1477 | return false; | |
1478 | } | |
56079431 | 1479 | |
1da177e4 LT |
1480 | /* |
1481 | * Invalidate hardware checksum when packet is to be mangled, and | |
1482 | * complete checksum manually on outgoing path. | |
1483 | */ | |
84fa7933 | 1484 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 1485 | { |
d3bc23e7 | 1486 | __wsum csum; |
663ead3b | 1487 | int ret = 0, offset; |
1da177e4 | 1488 | |
84fa7933 | 1489 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
1490 | goto out_set_summed; |
1491 | ||
1492 | if (unlikely(skb_shinfo(skb)->gso_size)) { | |
a430a43d HX |
1493 | /* Let GSO fix up the checksum. */ |
1494 | goto out_set_summed; | |
1da177e4 LT |
1495 | } |
1496 | ||
a030847e HX |
1497 | offset = skb->csum_start - skb_headroom(skb); |
1498 | BUG_ON(offset >= skb_headlen(skb)); | |
1499 | csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
1500 | ||
1501 | offset += skb->csum_offset; | |
1502 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); | |
1503 | ||
1504 | if (skb_cloned(skb) && | |
1505 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { | |
1da177e4 LT |
1506 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
1507 | if (ret) | |
1508 | goto out; | |
1509 | } | |
1510 | ||
a030847e | 1511 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
a430a43d | 1512 | out_set_summed: |
1da177e4 | 1513 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 1514 | out: |
1da177e4 LT |
1515 | return ret; |
1516 | } | |
1517 | ||
f6a78bfc HX |
1518 | /** |
1519 | * skb_gso_segment - Perform segmentation on skb. | |
1520 | * @skb: buffer to segment | |
576a30eb | 1521 | * @features: features for the output path (see dev->features) |
f6a78bfc HX |
1522 | * |
1523 | * This function segments the given skb and returns a list of segments. | |
576a30eb HX |
1524 | * |
1525 | * It may return NULL if the skb requires no segmentation. This is | |
1526 | * only possible when GSO is used for verifying header integrity. | |
f6a78bfc | 1527 | */ |
576a30eb | 1528 | struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features) |
f6a78bfc HX |
1529 | { |
1530 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
1531 | struct packet_type *ptype; | |
252e3346 | 1532 | __be16 type = skb->protocol; |
a430a43d | 1533 | int err; |
f6a78bfc HX |
1534 | |
1535 | BUG_ON(skb_shinfo(skb)->frag_list); | |
f6a78bfc | 1536 | |
459a98ed | 1537 | skb_reset_mac_header(skb); |
b0e380b1 | 1538 | skb->mac_len = skb->network_header - skb->mac_header; |
f6a78bfc HX |
1539 | __skb_pull(skb, skb->mac_len); |
1540 | ||
f9d106a6 | 1541 | if (WARN_ON(skb->ip_summed != CHECKSUM_PARTIAL)) { |
a430a43d HX |
1542 | if (skb_header_cloned(skb) && |
1543 | (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) | |
1544 | return ERR_PTR(err); | |
1545 | } | |
1546 | ||
f6a78bfc | 1547 | rcu_read_lock(); |
82d8a867 PE |
1548 | list_for_each_entry_rcu(ptype, |
1549 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { | |
f6a78bfc | 1550 | if (ptype->type == type && !ptype->dev && ptype->gso_segment) { |
84fa7933 | 1551 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
a430a43d HX |
1552 | err = ptype->gso_send_check(skb); |
1553 | segs = ERR_PTR(err); | |
1554 | if (err || skb_gso_ok(skb, features)) | |
1555 | break; | |
d56f90a7 ACM |
1556 | __skb_push(skb, (skb->data - |
1557 | skb_network_header(skb))); | |
a430a43d | 1558 | } |
576a30eb | 1559 | segs = ptype->gso_segment(skb, features); |
f6a78bfc HX |
1560 | break; |
1561 | } | |
1562 | } | |
1563 | rcu_read_unlock(); | |
1564 | ||
98e399f8 | 1565 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 1566 | |
f6a78bfc HX |
1567 | return segs; |
1568 | } | |
1569 | ||
1570 | EXPORT_SYMBOL(skb_gso_segment); | |
1571 | ||
fb286bb2 HX |
1572 | /* Take action when hardware reception checksum errors are detected. */ |
1573 | #ifdef CONFIG_BUG | |
1574 | void netdev_rx_csum_fault(struct net_device *dev) | |
1575 | { | |
1576 | if (net_ratelimit()) { | |
4ec93edb | 1577 | printk(KERN_ERR "%s: hw csum failure.\n", |
246a4212 | 1578 | dev ? dev->name : "<unknown>"); |
fb286bb2 HX |
1579 | dump_stack(); |
1580 | } | |
1581 | } | |
1582 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
1583 | #endif | |
1584 | ||
1da177e4 LT |
1585 | /* Actually, we should eliminate this check as soon as we know, that: |
1586 | * 1. IOMMU is present and allows to map all the memory. | |
1587 | * 2. No high memory really exists on this machine. | |
1588 | */ | |
1589 | ||
1590 | static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb) | |
1591 | { | |
3d3a8533 | 1592 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
1593 | int i; |
1594 | ||
1595 | if (dev->features & NETIF_F_HIGHDMA) | |
1596 | return 0; | |
1597 | ||
1598 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) | |
1599 | if (PageHighMem(skb_shinfo(skb)->frags[i].page)) | |
1600 | return 1; | |
1601 | ||
3d3a8533 | 1602 | #endif |
1da177e4 LT |
1603 | return 0; |
1604 | } | |
1da177e4 | 1605 | |
f6a78bfc HX |
1606 | struct dev_gso_cb { |
1607 | void (*destructor)(struct sk_buff *skb); | |
1608 | }; | |
1609 | ||
1610 | #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) | |
1611 | ||
1612 | static void dev_gso_skb_destructor(struct sk_buff *skb) | |
1613 | { | |
1614 | struct dev_gso_cb *cb; | |
1615 | ||
1616 | do { | |
1617 | struct sk_buff *nskb = skb->next; | |
1618 | ||
1619 | skb->next = nskb->next; | |
1620 | nskb->next = NULL; | |
1621 | kfree_skb(nskb); | |
1622 | } while (skb->next); | |
1623 | ||
1624 | cb = DEV_GSO_CB(skb); | |
1625 | if (cb->destructor) | |
1626 | cb->destructor(skb); | |
1627 | } | |
1628 | ||
1629 | /** | |
1630 | * dev_gso_segment - Perform emulated hardware segmentation on skb. | |
1631 | * @skb: buffer to segment | |
1632 | * | |
1633 | * This function segments the given skb and stores the list of segments | |
1634 | * in skb->next. | |
1635 | */ | |
1636 | static int dev_gso_segment(struct sk_buff *skb) | |
1637 | { | |
1638 | struct net_device *dev = skb->dev; | |
1639 | struct sk_buff *segs; | |
576a30eb HX |
1640 | int features = dev->features & ~(illegal_highdma(dev, skb) ? |
1641 | NETIF_F_SG : 0); | |
1642 | ||
1643 | segs = skb_gso_segment(skb, features); | |
1644 | ||
1645 | /* Verifying header integrity only. */ | |
1646 | if (!segs) | |
1647 | return 0; | |
f6a78bfc | 1648 | |
801678c5 | 1649 | if (IS_ERR(segs)) |
f6a78bfc HX |
1650 | return PTR_ERR(segs); |
1651 | ||
1652 | skb->next = segs; | |
1653 | DEV_GSO_CB(skb)->destructor = skb->destructor; | |
1654 | skb->destructor = dev_gso_skb_destructor; | |
1655 | ||
1656 | return 0; | |
1657 | } | |
1658 | ||
fd2ea0a7 DM |
1659 | int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, |
1660 | struct netdev_queue *txq) | |
f6a78bfc HX |
1661 | { |
1662 | if (likely(!skb->next)) { | |
9be9a6b9 | 1663 | if (!list_empty(&ptype_all)) |
f6a78bfc HX |
1664 | dev_queue_xmit_nit(skb, dev); |
1665 | ||
576a30eb HX |
1666 | if (netif_needs_gso(dev, skb)) { |
1667 | if (unlikely(dev_gso_segment(skb))) | |
1668 | goto out_kfree_skb; | |
1669 | if (skb->next) | |
1670 | goto gso; | |
1671 | } | |
f6a78bfc | 1672 | |
576a30eb | 1673 | return dev->hard_start_xmit(skb, dev); |
f6a78bfc HX |
1674 | } |
1675 | ||
576a30eb | 1676 | gso: |
f6a78bfc HX |
1677 | do { |
1678 | struct sk_buff *nskb = skb->next; | |
1679 | int rc; | |
1680 | ||
1681 | skb->next = nskb->next; | |
1682 | nskb->next = NULL; | |
1683 | rc = dev->hard_start_xmit(nskb, dev); | |
1684 | if (unlikely(rc)) { | |
f54d9e8d | 1685 | nskb->next = skb->next; |
f6a78bfc HX |
1686 | skb->next = nskb; |
1687 | return rc; | |
1688 | } | |
fd2ea0a7 | 1689 | if (unlikely(netif_tx_queue_stopped(txq) && skb->next)) |
f54d9e8d | 1690 | return NETDEV_TX_BUSY; |
f6a78bfc | 1691 | } while (skb->next); |
4ec93edb | 1692 | |
f6a78bfc HX |
1693 | skb->destructor = DEV_GSO_CB(skb)->destructor; |
1694 | ||
1695 | out_kfree_skb: | |
1696 | kfree_skb(skb); | |
1697 | return 0; | |
1698 | } | |
1699 | ||
b6b2fed1 DM |
1700 | static u32 simple_tx_hashrnd; |
1701 | static int simple_tx_hashrnd_initialized = 0; | |
1702 | ||
8f0f2223 DM |
1703 | static u16 simple_tx_hash(struct net_device *dev, struct sk_buff *skb) |
1704 | { | |
b6b2fed1 DM |
1705 | u32 addr1, addr2, ports; |
1706 | u32 hash, ihl; | |
ad55dcaf | 1707 | u8 ip_proto = 0; |
b6b2fed1 DM |
1708 | |
1709 | if (unlikely(!simple_tx_hashrnd_initialized)) { | |
1710 | get_random_bytes(&simple_tx_hashrnd, 4); | |
1711 | simple_tx_hashrnd_initialized = 1; | |
1712 | } | |
8f0f2223 DM |
1713 | |
1714 | switch (skb->protocol) { | |
60678040 | 1715 | case htons(ETH_P_IP): |
ad55dcaf AD |
1716 | if (!(ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET))) |
1717 | ip_proto = ip_hdr(skb)->protocol; | |
b6b2fed1 DM |
1718 | addr1 = ip_hdr(skb)->saddr; |
1719 | addr2 = ip_hdr(skb)->daddr; | |
8f0f2223 | 1720 | ihl = ip_hdr(skb)->ihl; |
8f0f2223 | 1721 | break; |
60678040 | 1722 | case htons(ETH_P_IPV6): |
8f0f2223 | 1723 | ip_proto = ipv6_hdr(skb)->nexthdr; |
b6b2fed1 DM |
1724 | addr1 = ipv6_hdr(skb)->saddr.s6_addr32[3]; |
1725 | addr2 = ipv6_hdr(skb)->daddr.s6_addr32[3]; | |
8f0f2223 | 1726 | ihl = (40 >> 2); |
8f0f2223 DM |
1727 | break; |
1728 | default: | |
1729 | return 0; | |
1730 | } | |
1731 | ||
8f0f2223 DM |
1732 | |
1733 | switch (ip_proto) { | |
1734 | case IPPROTO_TCP: | |
1735 | case IPPROTO_UDP: | |
1736 | case IPPROTO_DCCP: | |
1737 | case IPPROTO_ESP: | |
1738 | case IPPROTO_AH: | |
1739 | case IPPROTO_SCTP: | |
1740 | case IPPROTO_UDPLITE: | |
b6b2fed1 | 1741 | ports = *((u32 *) (skb_network_header(skb) + (ihl * 4))); |
8f0f2223 DM |
1742 | break; |
1743 | ||
1744 | default: | |
b6b2fed1 | 1745 | ports = 0; |
8f0f2223 DM |
1746 | break; |
1747 | } | |
1748 | ||
b6b2fed1 DM |
1749 | hash = jhash_3words(addr1, addr2, ports, simple_tx_hashrnd); |
1750 | ||
1751 | return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32); | |
8f0f2223 DM |
1752 | } |
1753 | ||
e8a0464c DM |
1754 | static struct netdev_queue *dev_pick_tx(struct net_device *dev, |
1755 | struct sk_buff *skb) | |
1756 | { | |
fd2ea0a7 DM |
1757 | u16 queue_index = 0; |
1758 | ||
eae792b7 DM |
1759 | if (dev->select_queue) |
1760 | queue_index = dev->select_queue(dev, skb); | |
8f0f2223 DM |
1761 | else if (dev->real_num_tx_queues > 1) |
1762 | queue_index = simple_tx_hash(dev, skb); | |
eae792b7 | 1763 | |
fd2ea0a7 DM |
1764 | skb_set_queue_mapping(skb, queue_index); |
1765 | return netdev_get_tx_queue(dev, queue_index); | |
e8a0464c DM |
1766 | } |
1767 | ||
d29f749e DJ |
1768 | /** |
1769 | * dev_queue_xmit - transmit a buffer | |
1770 | * @skb: buffer to transmit | |
1771 | * | |
1772 | * Queue a buffer for transmission to a network device. The caller must | |
1773 | * have set the device and priority and built the buffer before calling | |
1774 | * this function. The function can be called from an interrupt. | |
1775 | * | |
1776 | * A negative errno code is returned on a failure. A success does not | |
1777 | * guarantee the frame will be transmitted as it may be dropped due | |
1778 | * to congestion or traffic shaping. | |
1779 | * | |
1780 | * ----------------------------------------------------------------------------------- | |
1781 | * I notice this method can also return errors from the queue disciplines, | |
1782 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
1783 | * be positive. | |
1784 | * | |
1785 | * Regardless of the return value, the skb is consumed, so it is currently | |
1786 | * difficult to retry a send to this method. (You can bump the ref count | |
1787 | * before sending to hold a reference for retry if you are careful.) | |
1788 | * | |
1789 | * When calling this method, interrupts MUST be enabled. This is because | |
1790 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
1791 | * --BLG | |
1792 | */ | |
1da177e4 LT |
1793 | int dev_queue_xmit(struct sk_buff *skb) |
1794 | { | |
1795 | struct net_device *dev = skb->dev; | |
dc2b4847 | 1796 | struct netdev_queue *txq; |
1da177e4 LT |
1797 | struct Qdisc *q; |
1798 | int rc = -ENOMEM; | |
1799 | ||
f6a78bfc HX |
1800 | /* GSO will handle the following emulations directly. */ |
1801 | if (netif_needs_gso(dev, skb)) | |
1802 | goto gso; | |
1803 | ||
1da177e4 LT |
1804 | if (skb_shinfo(skb)->frag_list && |
1805 | !(dev->features & NETIF_F_FRAGLIST) && | |
364c6bad | 1806 | __skb_linearize(skb)) |
1da177e4 LT |
1807 | goto out_kfree_skb; |
1808 | ||
1809 | /* Fragmented skb is linearized if device does not support SG, | |
1810 | * or if at least one of fragments is in highmem and device | |
1811 | * does not support DMA from it. | |
1812 | */ | |
1813 | if (skb_shinfo(skb)->nr_frags && | |
1814 | (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) && | |
364c6bad | 1815 | __skb_linearize(skb)) |
1da177e4 LT |
1816 | goto out_kfree_skb; |
1817 | ||
1818 | /* If packet is not checksummed and device does not support | |
1819 | * checksumming for this protocol, complete checksumming here. | |
1820 | */ | |
663ead3b HX |
1821 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1822 | skb_set_transport_header(skb, skb->csum_start - | |
1823 | skb_headroom(skb)); | |
6de329e2 BH |
1824 | if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb)) |
1825 | goto out_kfree_skb; | |
663ead3b | 1826 | } |
1da177e4 | 1827 | |
f6a78bfc | 1828 | gso: |
4ec93edb YH |
1829 | /* Disable soft irqs for various locks below. Also |
1830 | * stops preemption for RCU. | |
1da177e4 | 1831 | */ |
4ec93edb | 1832 | rcu_read_lock_bh(); |
1da177e4 | 1833 | |
eae792b7 | 1834 | txq = dev_pick_tx(dev, skb); |
b0e1e646 | 1835 | q = rcu_dereference(txq->qdisc); |
37437bb2 | 1836 | |
1da177e4 LT |
1837 | #ifdef CONFIG_NET_CLS_ACT |
1838 | skb->tc_verd = SET_TC_AT(skb->tc_verd,AT_EGRESS); | |
1839 | #endif | |
1840 | if (q->enqueue) { | |
5fb66229 | 1841 | spinlock_t *root_lock = qdisc_lock(q); |
37437bb2 DM |
1842 | |
1843 | spin_lock(root_lock); | |
1844 | ||
a9312ae8 | 1845 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { |
96d20316 | 1846 | kfree_skb(skb); |
a9312ae8 | 1847 | rc = NET_XMIT_DROP; |
96d20316 DM |
1848 | } else { |
1849 | rc = qdisc_enqueue_root(skb, q); | |
1850 | qdisc_run(q); | |
a9312ae8 | 1851 | } |
37437bb2 DM |
1852 | spin_unlock(root_lock); |
1853 | ||
37437bb2 | 1854 | goto out; |
1da177e4 LT |
1855 | } |
1856 | ||
1857 | /* The device has no queue. Common case for software devices: | |
1858 | loopback, all the sorts of tunnels... | |
1859 | ||
932ff279 HX |
1860 | Really, it is unlikely that netif_tx_lock protection is necessary |
1861 | here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
1da177e4 LT |
1862 | counters.) |
1863 | However, it is possible, that they rely on protection | |
1864 | made by us here. | |
1865 | ||
1866 | Check this and shot the lock. It is not prone from deadlocks. | |
1867 | Either shot noqueue qdisc, it is even simpler 8) | |
1868 | */ | |
1869 | if (dev->flags & IFF_UP) { | |
1870 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
1871 | ||
c773e847 | 1872 | if (txq->xmit_lock_owner != cpu) { |
1da177e4 | 1873 | |
c773e847 | 1874 | HARD_TX_LOCK(dev, txq, cpu); |
1da177e4 | 1875 | |
fd2ea0a7 | 1876 | if (!netif_tx_queue_stopped(txq)) { |
1da177e4 | 1877 | rc = 0; |
fd2ea0a7 | 1878 | if (!dev_hard_start_xmit(skb, dev, txq)) { |
c773e847 | 1879 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
1880 | goto out; |
1881 | } | |
1882 | } | |
c773e847 | 1883 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
1884 | if (net_ratelimit()) |
1885 | printk(KERN_CRIT "Virtual device %s asks to " | |
1886 | "queue packet!\n", dev->name); | |
1887 | } else { | |
1888 | /* Recursion is detected! It is possible, | |
1889 | * unfortunately */ | |
1890 | if (net_ratelimit()) | |
1891 | printk(KERN_CRIT "Dead loop on virtual device " | |
1892 | "%s, fix it urgently!\n", dev->name); | |
1893 | } | |
1894 | } | |
1895 | ||
1896 | rc = -ENETDOWN; | |
d4828d85 | 1897 | rcu_read_unlock_bh(); |
1da177e4 LT |
1898 | |
1899 | out_kfree_skb: | |
1900 | kfree_skb(skb); | |
1901 | return rc; | |
1902 | out: | |
d4828d85 | 1903 | rcu_read_unlock_bh(); |
1da177e4 LT |
1904 | return rc; |
1905 | } | |
1906 | ||
1907 | ||
1908 | /*======================================================================= | |
1909 | Receiver routines | |
1910 | =======================================================================*/ | |
1911 | ||
6b2bedc3 SH |
1912 | int netdev_max_backlog __read_mostly = 1000; |
1913 | int netdev_budget __read_mostly = 300; | |
1914 | int weight_p __read_mostly = 64; /* old backlog weight */ | |
1da177e4 LT |
1915 | |
1916 | DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, }; | |
1917 | ||
1918 | ||
1da177e4 LT |
1919 | /** |
1920 | * netif_rx - post buffer to the network code | |
1921 | * @skb: buffer to post | |
1922 | * | |
1923 | * This function receives a packet from a device driver and queues it for | |
1924 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
1925 | * may be dropped during processing for congestion control or by the | |
1926 | * protocol layers. | |
1927 | * | |
1928 | * return values: | |
1929 | * NET_RX_SUCCESS (no congestion) | |
1da177e4 LT |
1930 | * NET_RX_DROP (packet was dropped) |
1931 | * | |
1932 | */ | |
1933 | ||
1934 | int netif_rx(struct sk_buff *skb) | |
1935 | { | |
1da177e4 LT |
1936 | struct softnet_data *queue; |
1937 | unsigned long flags; | |
1938 | ||
1939 | /* if netpoll wants it, pretend we never saw it */ | |
1940 | if (netpoll_rx(skb)) | |
1941 | return NET_RX_DROP; | |
1942 | ||
b7aa0bf7 | 1943 | if (!skb->tstamp.tv64) |
a61bbcf2 | 1944 | net_timestamp(skb); |
1da177e4 LT |
1945 | |
1946 | /* | |
1947 | * The code is rearranged so that the path is the most | |
1948 | * short when CPU is congested, but is still operating. | |
1949 | */ | |
1950 | local_irq_save(flags); | |
1da177e4 LT |
1951 | queue = &__get_cpu_var(softnet_data); |
1952 | ||
1953 | __get_cpu_var(netdev_rx_stat).total++; | |
1954 | if (queue->input_pkt_queue.qlen <= netdev_max_backlog) { | |
1955 | if (queue->input_pkt_queue.qlen) { | |
1da177e4 | 1956 | enqueue: |
1da177e4 | 1957 | __skb_queue_tail(&queue->input_pkt_queue, skb); |
1da177e4 | 1958 | local_irq_restore(flags); |
34008d8c | 1959 | return NET_RX_SUCCESS; |
1da177e4 LT |
1960 | } |
1961 | ||
bea3348e | 1962 | napi_schedule(&queue->backlog); |
1da177e4 LT |
1963 | goto enqueue; |
1964 | } | |
1965 | ||
1da177e4 LT |
1966 | __get_cpu_var(netdev_rx_stat).dropped++; |
1967 | local_irq_restore(flags); | |
1968 | ||
1969 | kfree_skb(skb); | |
1970 | return NET_RX_DROP; | |
1971 | } | |
1972 | ||
1973 | int netif_rx_ni(struct sk_buff *skb) | |
1974 | { | |
1975 | int err; | |
1976 | ||
1977 | preempt_disable(); | |
1978 | err = netif_rx(skb); | |
1979 | if (local_softirq_pending()) | |
1980 | do_softirq(); | |
1981 | preempt_enable(); | |
1982 | ||
1983 | return err; | |
1984 | } | |
1985 | ||
1986 | EXPORT_SYMBOL(netif_rx_ni); | |
1987 | ||
1da177e4 LT |
1988 | static void net_tx_action(struct softirq_action *h) |
1989 | { | |
1990 | struct softnet_data *sd = &__get_cpu_var(softnet_data); | |
1991 | ||
1992 | if (sd->completion_queue) { | |
1993 | struct sk_buff *clist; | |
1994 | ||
1995 | local_irq_disable(); | |
1996 | clist = sd->completion_queue; | |
1997 | sd->completion_queue = NULL; | |
1998 | local_irq_enable(); | |
1999 | ||
2000 | while (clist) { | |
2001 | struct sk_buff *skb = clist; | |
2002 | clist = clist->next; | |
2003 | ||
547b792c | 2004 | WARN_ON(atomic_read(&skb->users)); |
1da177e4 LT |
2005 | __kfree_skb(skb); |
2006 | } | |
2007 | } | |
2008 | ||
2009 | if (sd->output_queue) { | |
37437bb2 | 2010 | struct Qdisc *head; |
1da177e4 LT |
2011 | |
2012 | local_irq_disable(); | |
2013 | head = sd->output_queue; | |
2014 | sd->output_queue = NULL; | |
2015 | local_irq_enable(); | |
2016 | ||
2017 | while (head) { | |
37437bb2 DM |
2018 | struct Qdisc *q = head; |
2019 | spinlock_t *root_lock; | |
2020 | ||
1da177e4 LT |
2021 | head = head->next_sched; |
2022 | ||
5fb66229 | 2023 | root_lock = qdisc_lock(q); |
37437bb2 | 2024 | if (spin_trylock(root_lock)) { |
def82a1d JP |
2025 | smp_mb__before_clear_bit(); |
2026 | clear_bit(__QDISC_STATE_SCHED, | |
2027 | &q->state); | |
37437bb2 DM |
2028 | qdisc_run(q); |
2029 | spin_unlock(root_lock); | |
1da177e4 | 2030 | } else { |
195648bb | 2031 | if (!test_bit(__QDISC_STATE_DEACTIVATED, |
e8a83e10 | 2032 | &q->state)) { |
195648bb | 2033 | __netif_reschedule(q); |
e8a83e10 JP |
2034 | } else { |
2035 | smp_mb__before_clear_bit(); | |
2036 | clear_bit(__QDISC_STATE_SCHED, | |
2037 | &q->state); | |
2038 | } | |
1da177e4 LT |
2039 | } |
2040 | } | |
2041 | } | |
2042 | } | |
2043 | ||
6f05f629 SH |
2044 | static inline int deliver_skb(struct sk_buff *skb, |
2045 | struct packet_type *pt_prev, | |
2046 | struct net_device *orig_dev) | |
1da177e4 LT |
2047 | { |
2048 | atomic_inc(&skb->users); | |
f2ccd8fa | 2049 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
1da177e4 LT |
2050 | } |
2051 | ||
2052 | #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE) | |
6229e362 | 2053 | /* These hooks defined here for ATM */ |
1da177e4 LT |
2054 | struct net_bridge; |
2055 | struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br, | |
2056 | unsigned char *addr); | |
6229e362 | 2057 | void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent) __read_mostly; |
1da177e4 | 2058 | |
6229e362 SH |
2059 | /* |
2060 | * If bridge module is loaded call bridging hook. | |
2061 | * returns NULL if packet was consumed. | |
2062 | */ | |
2063 | struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p, | |
2064 | struct sk_buff *skb) __read_mostly; | |
2065 | static inline struct sk_buff *handle_bridge(struct sk_buff *skb, | |
2066 | struct packet_type **pt_prev, int *ret, | |
2067 | struct net_device *orig_dev) | |
1da177e4 LT |
2068 | { |
2069 | struct net_bridge_port *port; | |
2070 | ||
6229e362 SH |
2071 | if (skb->pkt_type == PACKET_LOOPBACK || |
2072 | (port = rcu_dereference(skb->dev->br_port)) == NULL) | |
2073 | return skb; | |
1da177e4 LT |
2074 | |
2075 | if (*pt_prev) { | |
6229e362 | 2076 | *ret = deliver_skb(skb, *pt_prev, orig_dev); |
1da177e4 | 2077 | *pt_prev = NULL; |
4ec93edb YH |
2078 | } |
2079 | ||
6229e362 | 2080 | return br_handle_frame_hook(port, skb); |
1da177e4 LT |
2081 | } |
2082 | #else | |
6229e362 | 2083 | #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb) |
1da177e4 LT |
2084 | #endif |
2085 | ||
b863ceb7 PM |
2086 | #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE) |
2087 | struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly; | |
2088 | EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook); | |
2089 | ||
2090 | static inline struct sk_buff *handle_macvlan(struct sk_buff *skb, | |
2091 | struct packet_type **pt_prev, | |
2092 | int *ret, | |
2093 | struct net_device *orig_dev) | |
2094 | { | |
2095 | if (skb->dev->macvlan_port == NULL) | |
2096 | return skb; | |
2097 | ||
2098 | if (*pt_prev) { | |
2099 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
2100 | *pt_prev = NULL; | |
2101 | } | |
2102 | return macvlan_handle_frame_hook(skb); | |
2103 | } | |
2104 | #else | |
2105 | #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb) | |
2106 | #endif | |
2107 | ||
1da177e4 LT |
2108 | #ifdef CONFIG_NET_CLS_ACT |
2109 | /* TODO: Maybe we should just force sch_ingress to be compiled in | |
2110 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions | |
2111 | * a compare and 2 stores extra right now if we dont have it on | |
2112 | * but have CONFIG_NET_CLS_ACT | |
4ec93edb | 2113 | * NOTE: This doesnt stop any functionality; if you dont have |
1da177e4 LT |
2114 | * the ingress scheduler, you just cant add policies on ingress. |
2115 | * | |
2116 | */ | |
4ec93edb | 2117 | static int ing_filter(struct sk_buff *skb) |
1da177e4 | 2118 | { |
1da177e4 | 2119 | struct net_device *dev = skb->dev; |
f697c3e8 | 2120 | u32 ttl = G_TC_RTTL(skb->tc_verd); |
555353cf DM |
2121 | struct netdev_queue *rxq; |
2122 | int result = TC_ACT_OK; | |
2123 | struct Qdisc *q; | |
4ec93edb | 2124 | |
f697c3e8 HX |
2125 | if (MAX_RED_LOOP < ttl++) { |
2126 | printk(KERN_WARNING | |
2127 | "Redir loop detected Dropping packet (%d->%d)\n", | |
2128 | skb->iif, dev->ifindex); | |
2129 | return TC_ACT_SHOT; | |
2130 | } | |
1da177e4 | 2131 | |
f697c3e8 HX |
2132 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl); |
2133 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS); | |
1da177e4 | 2134 | |
555353cf DM |
2135 | rxq = &dev->rx_queue; |
2136 | ||
83874000 | 2137 | q = rxq->qdisc; |
8d50b53d | 2138 | if (q != &noop_qdisc) { |
83874000 | 2139 | spin_lock(qdisc_lock(q)); |
a9312ae8 DM |
2140 | if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) |
2141 | result = qdisc_enqueue_root(skb, q); | |
83874000 DM |
2142 | spin_unlock(qdisc_lock(q)); |
2143 | } | |
f697c3e8 HX |
2144 | |
2145 | return result; | |
2146 | } | |
86e65da9 | 2147 | |
f697c3e8 HX |
2148 | static inline struct sk_buff *handle_ing(struct sk_buff *skb, |
2149 | struct packet_type **pt_prev, | |
2150 | int *ret, struct net_device *orig_dev) | |
2151 | { | |
8d50b53d | 2152 | if (skb->dev->rx_queue.qdisc == &noop_qdisc) |
f697c3e8 | 2153 | goto out; |
1da177e4 | 2154 | |
f697c3e8 HX |
2155 | if (*pt_prev) { |
2156 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
2157 | *pt_prev = NULL; | |
2158 | } else { | |
2159 | /* Huh? Why does turning on AF_PACKET affect this? */ | |
2160 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
1da177e4 LT |
2161 | } |
2162 | ||
f697c3e8 HX |
2163 | switch (ing_filter(skb)) { |
2164 | case TC_ACT_SHOT: | |
2165 | case TC_ACT_STOLEN: | |
2166 | kfree_skb(skb); | |
2167 | return NULL; | |
2168 | } | |
2169 | ||
2170 | out: | |
2171 | skb->tc_verd = 0; | |
2172 | return skb; | |
1da177e4 LT |
2173 | } |
2174 | #endif | |
2175 | ||
bc1d0411 PM |
2176 | /* |
2177 | * netif_nit_deliver - deliver received packets to network taps | |
2178 | * @skb: buffer | |
2179 | * | |
2180 | * This function is used to deliver incoming packets to network | |
2181 | * taps. It should be used when the normal netif_receive_skb path | |
2182 | * is bypassed, for example because of VLAN acceleration. | |
2183 | */ | |
2184 | void netif_nit_deliver(struct sk_buff *skb) | |
2185 | { | |
2186 | struct packet_type *ptype; | |
2187 | ||
2188 | if (list_empty(&ptype_all)) | |
2189 | return; | |
2190 | ||
2191 | skb_reset_network_header(skb); | |
2192 | skb_reset_transport_header(skb); | |
2193 | skb->mac_len = skb->network_header - skb->mac_header; | |
2194 | ||
2195 | rcu_read_lock(); | |
2196 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
2197 | if (!ptype->dev || ptype->dev == skb->dev) | |
2198 | deliver_skb(skb, ptype, skb->dev); | |
2199 | } | |
2200 | rcu_read_unlock(); | |
2201 | } | |
2202 | ||
3b582cc1 SH |
2203 | /** |
2204 | * netif_receive_skb - process receive buffer from network | |
2205 | * @skb: buffer to process | |
2206 | * | |
2207 | * netif_receive_skb() is the main receive data processing function. | |
2208 | * It always succeeds. The buffer may be dropped during processing | |
2209 | * for congestion control or by the protocol layers. | |
2210 | * | |
2211 | * This function may only be called from softirq context and interrupts | |
2212 | * should be enabled. | |
2213 | * | |
2214 | * Return values (usually ignored): | |
2215 | * NET_RX_SUCCESS: no congestion | |
2216 | * NET_RX_DROP: packet was dropped | |
2217 | */ | |
1da177e4 LT |
2218 | int netif_receive_skb(struct sk_buff *skb) |
2219 | { | |
2220 | struct packet_type *ptype, *pt_prev; | |
f2ccd8fa | 2221 | struct net_device *orig_dev; |
0d7a3681 | 2222 | struct net_device *null_or_orig; |
1da177e4 | 2223 | int ret = NET_RX_DROP; |
252e3346 | 2224 | __be16 type; |
1da177e4 LT |
2225 | |
2226 | /* if we've gotten here through NAPI, check netpoll */ | |
bea3348e | 2227 | if (netpoll_receive_skb(skb)) |
1da177e4 LT |
2228 | return NET_RX_DROP; |
2229 | ||
b7aa0bf7 | 2230 | if (!skb->tstamp.tv64) |
a61bbcf2 | 2231 | net_timestamp(skb); |
1da177e4 | 2232 | |
c01003c2 PM |
2233 | if (!skb->iif) |
2234 | skb->iif = skb->dev->ifindex; | |
86e65da9 | 2235 | |
0d7a3681 | 2236 | null_or_orig = NULL; |
cc9bd5ce JE |
2237 | orig_dev = skb->dev; |
2238 | if (orig_dev->master) { | |
0d7a3681 JE |
2239 | if (skb_bond_should_drop(skb)) |
2240 | null_or_orig = orig_dev; /* deliver only exact match */ | |
2241 | else | |
2242 | skb->dev = orig_dev->master; | |
cc9bd5ce | 2243 | } |
8f903c70 | 2244 | |
1da177e4 LT |
2245 | __get_cpu_var(netdev_rx_stat).total++; |
2246 | ||
c1d2bbe1 | 2247 | skb_reset_network_header(skb); |
badff6d0 | 2248 | skb_reset_transport_header(skb); |
b0e380b1 | 2249 | skb->mac_len = skb->network_header - skb->mac_header; |
1da177e4 LT |
2250 | |
2251 | pt_prev = NULL; | |
2252 | ||
2253 | rcu_read_lock(); | |
2254 | ||
b9f75f45 EB |
2255 | /* Don't receive packets in an exiting network namespace */ |
2256 | if (!net_alive(dev_net(skb->dev))) | |
2257 | goto out; | |
2258 | ||
1da177e4 LT |
2259 | #ifdef CONFIG_NET_CLS_ACT |
2260 | if (skb->tc_verd & TC_NCLS) { | |
2261 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
2262 | goto ncls; | |
2263 | } | |
2264 | #endif | |
2265 | ||
2266 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
f982307f JE |
2267 | if (ptype->dev == null_or_orig || ptype->dev == skb->dev || |
2268 | ptype->dev == orig_dev) { | |
4ec93edb | 2269 | if (pt_prev) |
f2ccd8fa | 2270 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
2271 | pt_prev = ptype; |
2272 | } | |
2273 | } | |
2274 | ||
2275 | #ifdef CONFIG_NET_CLS_ACT | |
f697c3e8 HX |
2276 | skb = handle_ing(skb, &pt_prev, &ret, orig_dev); |
2277 | if (!skb) | |
1da177e4 | 2278 | goto out; |
1da177e4 LT |
2279 | ncls: |
2280 | #endif | |
2281 | ||
6229e362 | 2282 | skb = handle_bridge(skb, &pt_prev, &ret, orig_dev); |
b863ceb7 PM |
2283 | if (!skb) |
2284 | goto out; | |
2285 | skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev); | |
6229e362 | 2286 | if (!skb) |
1da177e4 LT |
2287 | goto out; |
2288 | ||
2289 | type = skb->protocol; | |
82d8a867 PE |
2290 | list_for_each_entry_rcu(ptype, |
2291 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { | |
1da177e4 | 2292 | if (ptype->type == type && |
f982307f JE |
2293 | (ptype->dev == null_or_orig || ptype->dev == skb->dev || |
2294 | ptype->dev == orig_dev)) { | |
4ec93edb | 2295 | if (pt_prev) |
f2ccd8fa | 2296 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
2297 | pt_prev = ptype; |
2298 | } | |
2299 | } | |
2300 | ||
2301 | if (pt_prev) { | |
f2ccd8fa | 2302 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
1da177e4 LT |
2303 | } else { |
2304 | kfree_skb(skb); | |
2305 | /* Jamal, now you will not able to escape explaining | |
2306 | * me how you were going to use this. :-) | |
2307 | */ | |
2308 | ret = NET_RX_DROP; | |
2309 | } | |
2310 | ||
2311 | out: | |
2312 | rcu_read_unlock(); | |
2313 | return ret; | |
2314 | } | |
2315 | ||
6e583ce5 SH |
2316 | /* Network device is going away, flush any packets still pending */ |
2317 | static void flush_backlog(void *arg) | |
2318 | { | |
2319 | struct net_device *dev = arg; | |
2320 | struct softnet_data *queue = &__get_cpu_var(softnet_data); | |
2321 | struct sk_buff *skb, *tmp; | |
2322 | ||
2323 | skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp) | |
2324 | if (skb->dev == dev) { | |
2325 | __skb_unlink(skb, &queue->input_pkt_queue); | |
2326 | kfree_skb(skb); | |
2327 | } | |
2328 | } | |
2329 | ||
bea3348e | 2330 | static int process_backlog(struct napi_struct *napi, int quota) |
1da177e4 LT |
2331 | { |
2332 | int work = 0; | |
1da177e4 LT |
2333 | struct softnet_data *queue = &__get_cpu_var(softnet_data); |
2334 | unsigned long start_time = jiffies; | |
2335 | ||
bea3348e SH |
2336 | napi->weight = weight_p; |
2337 | do { | |
1da177e4 | 2338 | struct sk_buff *skb; |
1da177e4 LT |
2339 | |
2340 | local_irq_disable(); | |
2341 | skb = __skb_dequeue(&queue->input_pkt_queue); | |
bea3348e SH |
2342 | if (!skb) { |
2343 | __napi_complete(napi); | |
2344 | local_irq_enable(); | |
2345 | break; | |
2346 | } | |
1da177e4 LT |
2347 | local_irq_enable(); |
2348 | ||
1da177e4 | 2349 | netif_receive_skb(skb); |
bea3348e | 2350 | } while (++work < quota && jiffies == start_time); |
1da177e4 | 2351 | |
bea3348e SH |
2352 | return work; |
2353 | } | |
1da177e4 | 2354 | |
bea3348e SH |
2355 | /** |
2356 | * __napi_schedule - schedule for receive | |
c4ea43c5 | 2357 | * @n: entry to schedule |
bea3348e SH |
2358 | * |
2359 | * The entry's receive function will be scheduled to run | |
2360 | */ | |
b5606c2d | 2361 | void __napi_schedule(struct napi_struct *n) |
bea3348e SH |
2362 | { |
2363 | unsigned long flags; | |
1da177e4 | 2364 | |
bea3348e SH |
2365 | local_irq_save(flags); |
2366 | list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list); | |
2367 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
2368 | local_irq_restore(flags); | |
1da177e4 | 2369 | } |
bea3348e SH |
2370 | EXPORT_SYMBOL(__napi_schedule); |
2371 | ||
1da177e4 LT |
2372 | |
2373 | static void net_rx_action(struct softirq_action *h) | |
2374 | { | |
bea3348e | 2375 | struct list_head *list = &__get_cpu_var(softnet_data).poll_list; |
1da177e4 | 2376 | unsigned long start_time = jiffies; |
51b0bded | 2377 | int budget = netdev_budget; |
53fb95d3 MM |
2378 | void *have; |
2379 | ||
1da177e4 LT |
2380 | local_irq_disable(); |
2381 | ||
bea3348e SH |
2382 | while (!list_empty(list)) { |
2383 | struct napi_struct *n; | |
2384 | int work, weight; | |
1da177e4 | 2385 | |
bea3348e SH |
2386 | /* If softirq window is exhuasted then punt. |
2387 | * | |
2388 | * Note that this is a slight policy change from the | |
2389 | * previous NAPI code, which would allow up to 2 | |
2390 | * jiffies to pass before breaking out. The test | |
2391 | * used to be "jiffies - start_time > 1". | |
2392 | */ | |
2393 | if (unlikely(budget <= 0 || jiffies != start_time)) | |
1da177e4 LT |
2394 | goto softnet_break; |
2395 | ||
2396 | local_irq_enable(); | |
2397 | ||
bea3348e SH |
2398 | /* Even though interrupts have been re-enabled, this |
2399 | * access is safe because interrupts can only add new | |
2400 | * entries to the tail of this list, and only ->poll() | |
2401 | * calls can remove this head entry from the list. | |
2402 | */ | |
2403 | n = list_entry(list->next, struct napi_struct, poll_list); | |
1da177e4 | 2404 | |
bea3348e SH |
2405 | have = netpoll_poll_lock(n); |
2406 | ||
2407 | weight = n->weight; | |
2408 | ||
0a7606c1 DM |
2409 | /* This NAPI_STATE_SCHED test is for avoiding a race |
2410 | * with netpoll's poll_napi(). Only the entity which | |
2411 | * obtains the lock and sees NAPI_STATE_SCHED set will | |
2412 | * actually make the ->poll() call. Therefore we avoid | |
2413 | * accidently calling ->poll() when NAPI is not scheduled. | |
2414 | */ | |
2415 | work = 0; | |
2416 | if (test_bit(NAPI_STATE_SCHED, &n->state)) | |
2417 | work = n->poll(n, weight); | |
bea3348e SH |
2418 | |
2419 | WARN_ON_ONCE(work > weight); | |
2420 | ||
2421 | budget -= work; | |
2422 | ||
2423 | local_irq_disable(); | |
2424 | ||
2425 | /* Drivers must not modify the NAPI state if they | |
2426 | * consume the entire weight. In such cases this code | |
2427 | * still "owns" the NAPI instance and therefore can | |
2428 | * move the instance around on the list at-will. | |
2429 | */ | |
fed17f30 DM |
2430 | if (unlikely(work == weight)) { |
2431 | if (unlikely(napi_disable_pending(n))) | |
2432 | __napi_complete(n); | |
2433 | else | |
2434 | list_move_tail(&n->poll_list, list); | |
2435 | } | |
bea3348e SH |
2436 | |
2437 | netpoll_poll_unlock(have); | |
1da177e4 LT |
2438 | } |
2439 | out: | |
515e06c4 | 2440 | local_irq_enable(); |
bea3348e | 2441 | |
db217334 CL |
2442 | #ifdef CONFIG_NET_DMA |
2443 | /* | |
2444 | * There may not be any more sk_buffs coming right now, so push | |
2445 | * any pending DMA copies to hardware | |
2446 | */ | |
d379b01e DW |
2447 | if (!cpus_empty(net_dma.channel_mask)) { |
2448 | int chan_idx; | |
0e12f848 | 2449 | for_each_cpu_mask_nr(chan_idx, net_dma.channel_mask) { |
d379b01e DW |
2450 | struct dma_chan *chan = net_dma.channels[chan_idx]; |
2451 | if (chan) | |
2452 | dma_async_memcpy_issue_pending(chan); | |
2453 | } | |
db217334 CL |
2454 | } |
2455 | #endif | |
bea3348e | 2456 | |
1da177e4 LT |
2457 | return; |
2458 | ||
2459 | softnet_break: | |
2460 | __get_cpu_var(netdev_rx_stat).time_squeeze++; | |
2461 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
2462 | goto out; | |
2463 | } | |
2464 | ||
2465 | static gifconf_func_t * gifconf_list [NPROTO]; | |
2466 | ||
2467 | /** | |
2468 | * register_gifconf - register a SIOCGIF handler | |
2469 | * @family: Address family | |
2470 | * @gifconf: Function handler | |
2471 | * | |
2472 | * Register protocol dependent address dumping routines. The handler | |
2473 | * that is passed must not be freed or reused until it has been replaced | |
2474 | * by another handler. | |
2475 | */ | |
2476 | int register_gifconf(unsigned int family, gifconf_func_t * gifconf) | |
2477 | { | |
2478 | if (family >= NPROTO) | |
2479 | return -EINVAL; | |
2480 | gifconf_list[family] = gifconf; | |
2481 | return 0; | |
2482 | } | |
2483 | ||
2484 | ||
2485 | /* | |
2486 | * Map an interface index to its name (SIOCGIFNAME) | |
2487 | */ | |
2488 | ||
2489 | /* | |
2490 | * We need this ioctl for efficient implementation of the | |
2491 | * if_indextoname() function required by the IPv6 API. Without | |
2492 | * it, we would have to search all the interfaces to find a | |
2493 | * match. --pb | |
2494 | */ | |
2495 | ||
881d966b | 2496 | static int dev_ifname(struct net *net, struct ifreq __user *arg) |
1da177e4 LT |
2497 | { |
2498 | struct net_device *dev; | |
2499 | struct ifreq ifr; | |
2500 | ||
2501 | /* | |
2502 | * Fetch the caller's info block. | |
2503 | */ | |
2504 | ||
2505 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
2506 | return -EFAULT; | |
2507 | ||
2508 | read_lock(&dev_base_lock); | |
881d966b | 2509 | dev = __dev_get_by_index(net, ifr.ifr_ifindex); |
1da177e4 LT |
2510 | if (!dev) { |
2511 | read_unlock(&dev_base_lock); | |
2512 | return -ENODEV; | |
2513 | } | |
2514 | ||
2515 | strcpy(ifr.ifr_name, dev->name); | |
2516 | read_unlock(&dev_base_lock); | |
2517 | ||
2518 | if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) | |
2519 | return -EFAULT; | |
2520 | return 0; | |
2521 | } | |
2522 | ||
2523 | /* | |
2524 | * Perform a SIOCGIFCONF call. This structure will change | |
2525 | * size eventually, and there is nothing I can do about it. | |
2526 | * Thus we will need a 'compatibility mode'. | |
2527 | */ | |
2528 | ||
881d966b | 2529 | static int dev_ifconf(struct net *net, char __user *arg) |
1da177e4 LT |
2530 | { |
2531 | struct ifconf ifc; | |
2532 | struct net_device *dev; | |
2533 | char __user *pos; | |
2534 | int len; | |
2535 | int total; | |
2536 | int i; | |
2537 | ||
2538 | /* | |
2539 | * Fetch the caller's info block. | |
2540 | */ | |
2541 | ||
2542 | if (copy_from_user(&ifc, arg, sizeof(struct ifconf))) | |
2543 | return -EFAULT; | |
2544 | ||
2545 | pos = ifc.ifc_buf; | |
2546 | len = ifc.ifc_len; | |
2547 | ||
2548 | /* | |
2549 | * Loop over the interfaces, and write an info block for each. | |
2550 | */ | |
2551 | ||
2552 | total = 0; | |
881d966b | 2553 | for_each_netdev(net, dev) { |
1da177e4 LT |
2554 | for (i = 0; i < NPROTO; i++) { |
2555 | if (gifconf_list[i]) { | |
2556 | int done; | |
2557 | if (!pos) | |
2558 | done = gifconf_list[i](dev, NULL, 0); | |
2559 | else | |
2560 | done = gifconf_list[i](dev, pos + total, | |
2561 | len - total); | |
2562 | if (done < 0) | |
2563 | return -EFAULT; | |
2564 | total += done; | |
2565 | } | |
2566 | } | |
4ec93edb | 2567 | } |
1da177e4 LT |
2568 | |
2569 | /* | |
2570 | * All done. Write the updated control block back to the caller. | |
2571 | */ | |
2572 | ifc.ifc_len = total; | |
2573 | ||
2574 | /* | |
2575 | * Both BSD and Solaris return 0 here, so we do too. | |
2576 | */ | |
2577 | return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0; | |
2578 | } | |
2579 | ||
2580 | #ifdef CONFIG_PROC_FS | |
2581 | /* | |
2582 | * This is invoked by the /proc filesystem handler to display a device | |
2583 | * in detail. | |
2584 | */ | |
7562f876 | 2585 | void *dev_seq_start(struct seq_file *seq, loff_t *pos) |
9a429c49 | 2586 | __acquires(dev_base_lock) |
1da177e4 | 2587 | { |
e372c414 | 2588 | struct net *net = seq_file_net(seq); |
7562f876 | 2589 | loff_t off; |
1da177e4 | 2590 | struct net_device *dev; |
1da177e4 | 2591 | |
7562f876 PE |
2592 | read_lock(&dev_base_lock); |
2593 | if (!*pos) | |
2594 | return SEQ_START_TOKEN; | |
1da177e4 | 2595 | |
7562f876 | 2596 | off = 1; |
881d966b | 2597 | for_each_netdev(net, dev) |
7562f876 PE |
2598 | if (off++ == *pos) |
2599 | return dev; | |
1da177e4 | 2600 | |
7562f876 | 2601 | return NULL; |
1da177e4 LT |
2602 | } |
2603 | ||
2604 | void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2605 | { | |
e372c414 | 2606 | struct net *net = seq_file_net(seq); |
1da177e4 | 2607 | ++*pos; |
7562f876 | 2608 | return v == SEQ_START_TOKEN ? |
881d966b | 2609 | first_net_device(net) : next_net_device((struct net_device *)v); |
1da177e4 LT |
2610 | } |
2611 | ||
2612 | void dev_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2613 | __releases(dev_base_lock) |
1da177e4 LT |
2614 | { |
2615 | read_unlock(&dev_base_lock); | |
2616 | } | |
2617 | ||
2618 | static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) | |
2619 | { | |
c45d286e | 2620 | struct net_device_stats *stats = dev->get_stats(dev); |
1da177e4 | 2621 | |
5a1b5898 RR |
2622 | seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu " |
2623 | "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n", | |
2624 | dev->name, stats->rx_bytes, stats->rx_packets, | |
2625 | stats->rx_errors, | |
2626 | stats->rx_dropped + stats->rx_missed_errors, | |
2627 | stats->rx_fifo_errors, | |
2628 | stats->rx_length_errors + stats->rx_over_errors + | |
2629 | stats->rx_crc_errors + stats->rx_frame_errors, | |
2630 | stats->rx_compressed, stats->multicast, | |
2631 | stats->tx_bytes, stats->tx_packets, | |
2632 | stats->tx_errors, stats->tx_dropped, | |
2633 | stats->tx_fifo_errors, stats->collisions, | |
2634 | stats->tx_carrier_errors + | |
2635 | stats->tx_aborted_errors + | |
2636 | stats->tx_window_errors + | |
2637 | stats->tx_heartbeat_errors, | |
2638 | stats->tx_compressed); | |
1da177e4 LT |
2639 | } |
2640 | ||
2641 | /* | |
2642 | * Called from the PROCfs module. This now uses the new arbitrary sized | |
2643 | * /proc/net interface to create /proc/net/dev | |
2644 | */ | |
2645 | static int dev_seq_show(struct seq_file *seq, void *v) | |
2646 | { | |
2647 | if (v == SEQ_START_TOKEN) | |
2648 | seq_puts(seq, "Inter-| Receive " | |
2649 | " | Transmit\n" | |
2650 | " face |bytes packets errs drop fifo frame " | |
2651 | "compressed multicast|bytes packets errs " | |
2652 | "drop fifo colls carrier compressed\n"); | |
2653 | else | |
2654 | dev_seq_printf_stats(seq, v); | |
2655 | return 0; | |
2656 | } | |
2657 | ||
2658 | static struct netif_rx_stats *softnet_get_online(loff_t *pos) | |
2659 | { | |
2660 | struct netif_rx_stats *rc = NULL; | |
2661 | ||
0c0b0aca | 2662 | while (*pos < nr_cpu_ids) |
4ec93edb | 2663 | if (cpu_online(*pos)) { |
1da177e4 LT |
2664 | rc = &per_cpu(netdev_rx_stat, *pos); |
2665 | break; | |
2666 | } else | |
2667 | ++*pos; | |
2668 | return rc; | |
2669 | } | |
2670 | ||
2671 | static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) | |
2672 | { | |
2673 | return softnet_get_online(pos); | |
2674 | } | |
2675 | ||
2676 | static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2677 | { | |
2678 | ++*pos; | |
2679 | return softnet_get_online(pos); | |
2680 | } | |
2681 | ||
2682 | static void softnet_seq_stop(struct seq_file *seq, void *v) | |
2683 | { | |
2684 | } | |
2685 | ||
2686 | static int softnet_seq_show(struct seq_file *seq, void *v) | |
2687 | { | |
2688 | struct netif_rx_stats *s = v; | |
2689 | ||
2690 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n", | |
31aa02c5 | 2691 | s->total, s->dropped, s->time_squeeze, 0, |
c1ebcdb8 SH |
2692 | 0, 0, 0, 0, /* was fastroute */ |
2693 | s->cpu_collision ); | |
1da177e4 LT |
2694 | return 0; |
2695 | } | |
2696 | ||
f690808e | 2697 | static const struct seq_operations dev_seq_ops = { |
1da177e4 LT |
2698 | .start = dev_seq_start, |
2699 | .next = dev_seq_next, | |
2700 | .stop = dev_seq_stop, | |
2701 | .show = dev_seq_show, | |
2702 | }; | |
2703 | ||
2704 | static int dev_seq_open(struct inode *inode, struct file *file) | |
2705 | { | |
e372c414 DL |
2706 | return seq_open_net(inode, file, &dev_seq_ops, |
2707 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2708 | } |
2709 | ||
9a32144e | 2710 | static const struct file_operations dev_seq_fops = { |
1da177e4 LT |
2711 | .owner = THIS_MODULE, |
2712 | .open = dev_seq_open, | |
2713 | .read = seq_read, | |
2714 | .llseek = seq_lseek, | |
e372c414 | 2715 | .release = seq_release_net, |
1da177e4 LT |
2716 | }; |
2717 | ||
f690808e | 2718 | static const struct seq_operations softnet_seq_ops = { |
1da177e4 LT |
2719 | .start = softnet_seq_start, |
2720 | .next = softnet_seq_next, | |
2721 | .stop = softnet_seq_stop, | |
2722 | .show = softnet_seq_show, | |
2723 | }; | |
2724 | ||
2725 | static int softnet_seq_open(struct inode *inode, struct file *file) | |
2726 | { | |
2727 | return seq_open(file, &softnet_seq_ops); | |
2728 | } | |
2729 | ||
9a32144e | 2730 | static const struct file_operations softnet_seq_fops = { |
1da177e4 LT |
2731 | .owner = THIS_MODULE, |
2732 | .open = softnet_seq_open, | |
2733 | .read = seq_read, | |
2734 | .llseek = seq_lseek, | |
2735 | .release = seq_release, | |
2736 | }; | |
2737 | ||
0e1256ff SH |
2738 | static void *ptype_get_idx(loff_t pos) |
2739 | { | |
2740 | struct packet_type *pt = NULL; | |
2741 | loff_t i = 0; | |
2742 | int t; | |
2743 | ||
2744 | list_for_each_entry_rcu(pt, &ptype_all, list) { | |
2745 | if (i == pos) | |
2746 | return pt; | |
2747 | ++i; | |
2748 | } | |
2749 | ||
82d8a867 | 2750 | for (t = 0; t < PTYPE_HASH_SIZE; t++) { |
0e1256ff SH |
2751 | list_for_each_entry_rcu(pt, &ptype_base[t], list) { |
2752 | if (i == pos) | |
2753 | return pt; | |
2754 | ++i; | |
2755 | } | |
2756 | } | |
2757 | return NULL; | |
2758 | } | |
2759 | ||
2760 | static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) | |
72348a42 | 2761 | __acquires(RCU) |
0e1256ff SH |
2762 | { |
2763 | rcu_read_lock(); | |
2764 | return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN; | |
2765 | } | |
2766 | ||
2767 | static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2768 | { | |
2769 | struct packet_type *pt; | |
2770 | struct list_head *nxt; | |
2771 | int hash; | |
2772 | ||
2773 | ++*pos; | |
2774 | if (v == SEQ_START_TOKEN) | |
2775 | return ptype_get_idx(0); | |
2776 | ||
2777 | pt = v; | |
2778 | nxt = pt->list.next; | |
2779 | if (pt->type == htons(ETH_P_ALL)) { | |
2780 | if (nxt != &ptype_all) | |
2781 | goto found; | |
2782 | hash = 0; | |
2783 | nxt = ptype_base[0].next; | |
2784 | } else | |
82d8a867 | 2785 | hash = ntohs(pt->type) & PTYPE_HASH_MASK; |
0e1256ff SH |
2786 | |
2787 | while (nxt == &ptype_base[hash]) { | |
82d8a867 | 2788 | if (++hash >= PTYPE_HASH_SIZE) |
0e1256ff SH |
2789 | return NULL; |
2790 | nxt = ptype_base[hash].next; | |
2791 | } | |
2792 | found: | |
2793 | return list_entry(nxt, struct packet_type, list); | |
2794 | } | |
2795 | ||
2796 | static void ptype_seq_stop(struct seq_file *seq, void *v) | |
72348a42 | 2797 | __releases(RCU) |
0e1256ff SH |
2798 | { |
2799 | rcu_read_unlock(); | |
2800 | } | |
2801 | ||
2802 | static void ptype_seq_decode(struct seq_file *seq, void *sym) | |
2803 | { | |
2804 | #ifdef CONFIG_KALLSYMS | |
2805 | unsigned long offset = 0, symsize; | |
2806 | const char *symname; | |
2807 | char *modname; | |
2808 | char namebuf[128]; | |
2809 | ||
2810 | symname = kallsyms_lookup((unsigned long)sym, &symsize, &offset, | |
2811 | &modname, namebuf); | |
2812 | ||
2813 | if (symname) { | |
2814 | char *delim = ":"; | |
2815 | ||
2816 | if (!modname) | |
2817 | modname = delim = ""; | |
2818 | seq_printf(seq, "%s%s%s%s+0x%lx", delim, modname, delim, | |
2819 | symname, offset); | |
2820 | return; | |
2821 | } | |
2822 | #endif | |
2823 | ||
2824 | seq_printf(seq, "[%p]", sym); | |
2825 | } | |
2826 | ||
2827 | static int ptype_seq_show(struct seq_file *seq, void *v) | |
2828 | { | |
2829 | struct packet_type *pt = v; | |
2830 | ||
2831 | if (v == SEQ_START_TOKEN) | |
2832 | seq_puts(seq, "Type Device Function\n"); | |
c346dca1 | 2833 | else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) { |
0e1256ff SH |
2834 | if (pt->type == htons(ETH_P_ALL)) |
2835 | seq_puts(seq, "ALL "); | |
2836 | else | |
2837 | seq_printf(seq, "%04x", ntohs(pt->type)); | |
2838 | ||
2839 | seq_printf(seq, " %-8s ", | |
2840 | pt->dev ? pt->dev->name : ""); | |
2841 | ptype_seq_decode(seq, pt->func); | |
2842 | seq_putc(seq, '\n'); | |
2843 | } | |
2844 | ||
2845 | return 0; | |
2846 | } | |
2847 | ||
2848 | static const struct seq_operations ptype_seq_ops = { | |
2849 | .start = ptype_seq_start, | |
2850 | .next = ptype_seq_next, | |
2851 | .stop = ptype_seq_stop, | |
2852 | .show = ptype_seq_show, | |
2853 | }; | |
2854 | ||
2855 | static int ptype_seq_open(struct inode *inode, struct file *file) | |
2856 | { | |
2feb27db PE |
2857 | return seq_open_net(inode, file, &ptype_seq_ops, |
2858 | sizeof(struct seq_net_private)); | |
0e1256ff SH |
2859 | } |
2860 | ||
2861 | static const struct file_operations ptype_seq_fops = { | |
2862 | .owner = THIS_MODULE, | |
2863 | .open = ptype_seq_open, | |
2864 | .read = seq_read, | |
2865 | .llseek = seq_lseek, | |
2feb27db | 2866 | .release = seq_release_net, |
0e1256ff SH |
2867 | }; |
2868 | ||
2869 | ||
4665079c | 2870 | static int __net_init dev_proc_net_init(struct net *net) |
1da177e4 LT |
2871 | { |
2872 | int rc = -ENOMEM; | |
2873 | ||
881d966b | 2874 | if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops)) |
1da177e4 | 2875 | goto out; |
881d966b | 2876 | if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops)) |
1da177e4 | 2877 | goto out_dev; |
881d966b | 2878 | if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops)) |
457c4cbc | 2879 | goto out_softnet; |
0e1256ff | 2880 | |
881d966b | 2881 | if (wext_proc_init(net)) |
457c4cbc | 2882 | goto out_ptype; |
1da177e4 LT |
2883 | rc = 0; |
2884 | out: | |
2885 | return rc; | |
457c4cbc | 2886 | out_ptype: |
881d966b | 2887 | proc_net_remove(net, "ptype"); |
1da177e4 | 2888 | out_softnet: |
881d966b | 2889 | proc_net_remove(net, "softnet_stat"); |
1da177e4 | 2890 | out_dev: |
881d966b | 2891 | proc_net_remove(net, "dev"); |
1da177e4 LT |
2892 | goto out; |
2893 | } | |
881d966b | 2894 | |
4665079c | 2895 | static void __net_exit dev_proc_net_exit(struct net *net) |
881d966b EB |
2896 | { |
2897 | wext_proc_exit(net); | |
2898 | ||
2899 | proc_net_remove(net, "ptype"); | |
2900 | proc_net_remove(net, "softnet_stat"); | |
2901 | proc_net_remove(net, "dev"); | |
2902 | } | |
2903 | ||
022cbae6 | 2904 | static struct pernet_operations __net_initdata dev_proc_ops = { |
881d966b EB |
2905 | .init = dev_proc_net_init, |
2906 | .exit = dev_proc_net_exit, | |
2907 | }; | |
2908 | ||
2909 | static int __init dev_proc_init(void) | |
2910 | { | |
2911 | return register_pernet_subsys(&dev_proc_ops); | |
2912 | } | |
1da177e4 LT |
2913 | #else |
2914 | #define dev_proc_init() 0 | |
2915 | #endif /* CONFIG_PROC_FS */ | |
2916 | ||
2917 | ||
2918 | /** | |
2919 | * netdev_set_master - set up master/slave pair | |
2920 | * @slave: slave device | |
2921 | * @master: new master device | |
2922 | * | |
2923 | * Changes the master device of the slave. Pass %NULL to break the | |
2924 | * bonding. The caller must hold the RTNL semaphore. On a failure | |
2925 | * a negative errno code is returned. On success the reference counts | |
2926 | * are adjusted, %RTM_NEWLINK is sent to the routing socket and the | |
2927 | * function returns zero. | |
2928 | */ | |
2929 | int netdev_set_master(struct net_device *slave, struct net_device *master) | |
2930 | { | |
2931 | struct net_device *old = slave->master; | |
2932 | ||
2933 | ASSERT_RTNL(); | |
2934 | ||
2935 | if (master) { | |
2936 | if (old) | |
2937 | return -EBUSY; | |
2938 | dev_hold(master); | |
2939 | } | |
2940 | ||
2941 | slave->master = master; | |
4ec93edb | 2942 | |
1da177e4 LT |
2943 | synchronize_net(); |
2944 | ||
2945 | if (old) | |
2946 | dev_put(old); | |
2947 | ||
2948 | if (master) | |
2949 | slave->flags |= IFF_SLAVE; | |
2950 | else | |
2951 | slave->flags &= ~IFF_SLAVE; | |
2952 | ||
2953 | rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE); | |
2954 | return 0; | |
2955 | } | |
2956 | ||
b6c40d68 PM |
2957 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
2958 | { | |
2959 | if (dev->flags & IFF_UP && dev->change_rx_flags) | |
2960 | dev->change_rx_flags(dev, flags); | |
2961 | } | |
2962 | ||
dad9b335 | 2963 | static int __dev_set_promiscuity(struct net_device *dev, int inc) |
1da177e4 LT |
2964 | { |
2965 | unsigned short old_flags = dev->flags; | |
2966 | ||
24023451 PM |
2967 | ASSERT_RTNL(); |
2968 | ||
dad9b335 WC |
2969 | dev->flags |= IFF_PROMISC; |
2970 | dev->promiscuity += inc; | |
2971 | if (dev->promiscuity == 0) { | |
2972 | /* | |
2973 | * Avoid overflow. | |
2974 | * If inc causes overflow, untouch promisc and return error. | |
2975 | */ | |
2976 | if (inc < 0) | |
2977 | dev->flags &= ~IFF_PROMISC; | |
2978 | else { | |
2979 | dev->promiscuity -= inc; | |
2980 | printk(KERN_WARNING "%s: promiscuity touches roof, " | |
2981 | "set promiscuity failed, promiscuity feature " | |
2982 | "of device might be broken.\n", dev->name); | |
2983 | return -EOVERFLOW; | |
2984 | } | |
2985 | } | |
52609c0b | 2986 | if (dev->flags != old_flags) { |
1da177e4 LT |
2987 | printk(KERN_INFO "device %s %s promiscuous mode\n", |
2988 | dev->name, (dev->flags & IFF_PROMISC) ? "entered" : | |
4ec93edb | 2989 | "left"); |
7759db82 KHK |
2990 | if (audit_enabled) |
2991 | audit_log(current->audit_context, GFP_ATOMIC, | |
2992 | AUDIT_ANOM_PROMISCUOUS, | |
2993 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", | |
2994 | dev->name, (dev->flags & IFF_PROMISC), | |
2995 | (old_flags & IFF_PROMISC), | |
2996 | audit_get_loginuid(current), | |
2997 | current->uid, current->gid, | |
2998 | audit_get_sessionid(current)); | |
24023451 | 2999 | |
b6c40d68 | 3000 | dev_change_rx_flags(dev, IFF_PROMISC); |
1da177e4 | 3001 | } |
dad9b335 | 3002 | return 0; |
1da177e4 LT |
3003 | } |
3004 | ||
4417da66 PM |
3005 | /** |
3006 | * dev_set_promiscuity - update promiscuity count on a device | |
3007 | * @dev: device | |
3008 | * @inc: modifier | |
3009 | * | |
3010 | * Add or remove promiscuity from a device. While the count in the device | |
3011 | * remains above zero the interface remains promiscuous. Once it hits zero | |
3012 | * the device reverts back to normal filtering operation. A negative inc | |
3013 | * value is used to drop promiscuity on the device. | |
dad9b335 | 3014 | * Return 0 if successful or a negative errno code on error. |
4417da66 | 3015 | */ |
dad9b335 | 3016 | int dev_set_promiscuity(struct net_device *dev, int inc) |
4417da66 PM |
3017 | { |
3018 | unsigned short old_flags = dev->flags; | |
dad9b335 | 3019 | int err; |
4417da66 | 3020 | |
dad9b335 | 3021 | err = __dev_set_promiscuity(dev, inc); |
4b5a698e | 3022 | if (err < 0) |
dad9b335 | 3023 | return err; |
4417da66 PM |
3024 | if (dev->flags != old_flags) |
3025 | dev_set_rx_mode(dev); | |
dad9b335 | 3026 | return err; |
4417da66 PM |
3027 | } |
3028 | ||
1da177e4 LT |
3029 | /** |
3030 | * dev_set_allmulti - update allmulti count on a device | |
3031 | * @dev: device | |
3032 | * @inc: modifier | |
3033 | * | |
3034 | * Add or remove reception of all multicast frames to a device. While the | |
3035 | * count in the device remains above zero the interface remains listening | |
3036 | * to all interfaces. Once it hits zero the device reverts back to normal | |
3037 | * filtering operation. A negative @inc value is used to drop the counter | |
3038 | * when releasing a resource needing all multicasts. | |
dad9b335 | 3039 | * Return 0 if successful or a negative errno code on error. |
1da177e4 LT |
3040 | */ |
3041 | ||
dad9b335 | 3042 | int dev_set_allmulti(struct net_device *dev, int inc) |
1da177e4 LT |
3043 | { |
3044 | unsigned short old_flags = dev->flags; | |
3045 | ||
24023451 PM |
3046 | ASSERT_RTNL(); |
3047 | ||
1da177e4 | 3048 | dev->flags |= IFF_ALLMULTI; |
dad9b335 WC |
3049 | dev->allmulti += inc; |
3050 | if (dev->allmulti == 0) { | |
3051 | /* | |
3052 | * Avoid overflow. | |
3053 | * If inc causes overflow, untouch allmulti and return error. | |
3054 | */ | |
3055 | if (inc < 0) | |
3056 | dev->flags &= ~IFF_ALLMULTI; | |
3057 | else { | |
3058 | dev->allmulti -= inc; | |
3059 | printk(KERN_WARNING "%s: allmulti touches roof, " | |
3060 | "set allmulti failed, allmulti feature of " | |
3061 | "device might be broken.\n", dev->name); | |
3062 | return -EOVERFLOW; | |
3063 | } | |
3064 | } | |
24023451 | 3065 | if (dev->flags ^ old_flags) { |
b6c40d68 | 3066 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
4417da66 | 3067 | dev_set_rx_mode(dev); |
24023451 | 3068 | } |
dad9b335 | 3069 | return 0; |
4417da66 PM |
3070 | } |
3071 | ||
3072 | /* | |
3073 | * Upload unicast and multicast address lists to device and | |
3074 | * configure RX filtering. When the device doesn't support unicast | |
53ccaae1 | 3075 | * filtering it is put in promiscuous mode while unicast addresses |
4417da66 PM |
3076 | * are present. |
3077 | */ | |
3078 | void __dev_set_rx_mode(struct net_device *dev) | |
3079 | { | |
3080 | /* dev_open will call this function so the list will stay sane. */ | |
3081 | if (!(dev->flags&IFF_UP)) | |
3082 | return; | |
3083 | ||
3084 | if (!netif_device_present(dev)) | |
40b77c94 | 3085 | return; |
4417da66 PM |
3086 | |
3087 | if (dev->set_rx_mode) | |
3088 | dev->set_rx_mode(dev); | |
3089 | else { | |
3090 | /* Unicast addresses changes may only happen under the rtnl, | |
3091 | * therefore calling __dev_set_promiscuity here is safe. | |
3092 | */ | |
3093 | if (dev->uc_count > 0 && !dev->uc_promisc) { | |
3094 | __dev_set_promiscuity(dev, 1); | |
3095 | dev->uc_promisc = 1; | |
3096 | } else if (dev->uc_count == 0 && dev->uc_promisc) { | |
3097 | __dev_set_promiscuity(dev, -1); | |
3098 | dev->uc_promisc = 0; | |
3099 | } | |
3100 | ||
3101 | if (dev->set_multicast_list) | |
3102 | dev->set_multicast_list(dev); | |
3103 | } | |
3104 | } | |
3105 | ||
3106 | void dev_set_rx_mode(struct net_device *dev) | |
3107 | { | |
b9e40857 | 3108 | netif_addr_lock_bh(dev); |
4417da66 | 3109 | __dev_set_rx_mode(dev); |
b9e40857 | 3110 | netif_addr_unlock_bh(dev); |
1da177e4 LT |
3111 | } |
3112 | ||
61cbc2fc PM |
3113 | int __dev_addr_delete(struct dev_addr_list **list, int *count, |
3114 | void *addr, int alen, int glbl) | |
bf742482 PM |
3115 | { |
3116 | struct dev_addr_list *da; | |
3117 | ||
3118 | for (; (da = *list) != NULL; list = &da->next) { | |
3119 | if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 && | |
3120 | alen == da->da_addrlen) { | |
3121 | if (glbl) { | |
3122 | int old_glbl = da->da_gusers; | |
3123 | da->da_gusers = 0; | |
3124 | if (old_glbl == 0) | |
3125 | break; | |
3126 | } | |
3127 | if (--da->da_users) | |
3128 | return 0; | |
3129 | ||
3130 | *list = da->next; | |
3131 | kfree(da); | |
61cbc2fc | 3132 | (*count)--; |
bf742482 PM |
3133 | return 0; |
3134 | } | |
3135 | } | |
3136 | return -ENOENT; | |
3137 | } | |
3138 | ||
61cbc2fc PM |
3139 | int __dev_addr_add(struct dev_addr_list **list, int *count, |
3140 | void *addr, int alen, int glbl) | |
bf742482 PM |
3141 | { |
3142 | struct dev_addr_list *da; | |
3143 | ||
3144 | for (da = *list; da != NULL; da = da->next) { | |
3145 | if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 && | |
3146 | da->da_addrlen == alen) { | |
3147 | if (glbl) { | |
3148 | int old_glbl = da->da_gusers; | |
3149 | da->da_gusers = 1; | |
3150 | if (old_glbl) | |
3151 | return 0; | |
3152 | } | |
3153 | da->da_users++; | |
3154 | return 0; | |
3155 | } | |
3156 | } | |
3157 | ||
12aa343a | 3158 | da = kzalloc(sizeof(*da), GFP_ATOMIC); |
bf742482 PM |
3159 | if (da == NULL) |
3160 | return -ENOMEM; | |
3161 | memcpy(da->da_addr, addr, alen); | |
3162 | da->da_addrlen = alen; | |
3163 | da->da_users = 1; | |
3164 | da->da_gusers = glbl ? 1 : 0; | |
3165 | da->next = *list; | |
3166 | *list = da; | |
61cbc2fc | 3167 | (*count)++; |
bf742482 PM |
3168 | return 0; |
3169 | } | |
3170 | ||
4417da66 PM |
3171 | /** |
3172 | * dev_unicast_delete - Release secondary unicast address. | |
3173 | * @dev: device | |
0ed72ec4 RD |
3174 | * @addr: address to delete |
3175 | * @alen: length of @addr | |
4417da66 PM |
3176 | * |
3177 | * Release reference to a secondary unicast address and remove it | |
0ed72ec4 | 3178 | * from the device if the reference count drops to zero. |
4417da66 PM |
3179 | * |
3180 | * The caller must hold the rtnl_mutex. | |
3181 | */ | |
3182 | int dev_unicast_delete(struct net_device *dev, void *addr, int alen) | |
3183 | { | |
3184 | int err; | |
3185 | ||
3186 | ASSERT_RTNL(); | |
3187 | ||
b9e40857 | 3188 | netif_addr_lock_bh(dev); |
61cbc2fc PM |
3189 | err = __dev_addr_delete(&dev->uc_list, &dev->uc_count, addr, alen, 0); |
3190 | if (!err) | |
4417da66 | 3191 | __dev_set_rx_mode(dev); |
b9e40857 | 3192 | netif_addr_unlock_bh(dev); |
4417da66 PM |
3193 | return err; |
3194 | } | |
3195 | EXPORT_SYMBOL(dev_unicast_delete); | |
3196 | ||
3197 | /** | |
3198 | * dev_unicast_add - add a secondary unicast address | |
3199 | * @dev: device | |
5dbaec5d | 3200 | * @addr: address to add |
0ed72ec4 | 3201 | * @alen: length of @addr |
4417da66 PM |
3202 | * |
3203 | * Add a secondary unicast address to the device or increase | |
3204 | * the reference count if it already exists. | |
3205 | * | |
3206 | * The caller must hold the rtnl_mutex. | |
3207 | */ | |
3208 | int dev_unicast_add(struct net_device *dev, void *addr, int alen) | |
3209 | { | |
3210 | int err; | |
3211 | ||
3212 | ASSERT_RTNL(); | |
3213 | ||
b9e40857 | 3214 | netif_addr_lock_bh(dev); |
61cbc2fc PM |
3215 | err = __dev_addr_add(&dev->uc_list, &dev->uc_count, addr, alen, 0); |
3216 | if (!err) | |
4417da66 | 3217 | __dev_set_rx_mode(dev); |
b9e40857 | 3218 | netif_addr_unlock_bh(dev); |
4417da66 PM |
3219 | return err; |
3220 | } | |
3221 | EXPORT_SYMBOL(dev_unicast_add); | |
3222 | ||
e83a2ea8 CL |
3223 | int __dev_addr_sync(struct dev_addr_list **to, int *to_count, |
3224 | struct dev_addr_list **from, int *from_count) | |
3225 | { | |
3226 | struct dev_addr_list *da, *next; | |
3227 | int err = 0; | |
3228 | ||
3229 | da = *from; | |
3230 | while (da != NULL) { | |
3231 | next = da->next; | |
3232 | if (!da->da_synced) { | |
3233 | err = __dev_addr_add(to, to_count, | |
3234 | da->da_addr, da->da_addrlen, 0); | |
3235 | if (err < 0) | |
3236 | break; | |
3237 | da->da_synced = 1; | |
3238 | da->da_users++; | |
3239 | } else if (da->da_users == 1) { | |
3240 | __dev_addr_delete(to, to_count, | |
3241 | da->da_addr, da->da_addrlen, 0); | |
3242 | __dev_addr_delete(from, from_count, | |
3243 | da->da_addr, da->da_addrlen, 0); | |
3244 | } | |
3245 | da = next; | |
3246 | } | |
3247 | return err; | |
3248 | } | |
3249 | ||
3250 | void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, | |
3251 | struct dev_addr_list **from, int *from_count) | |
3252 | { | |
3253 | struct dev_addr_list *da, *next; | |
3254 | ||
3255 | da = *from; | |
3256 | while (da != NULL) { | |
3257 | next = da->next; | |
3258 | if (da->da_synced) { | |
3259 | __dev_addr_delete(to, to_count, | |
3260 | da->da_addr, da->da_addrlen, 0); | |
3261 | da->da_synced = 0; | |
3262 | __dev_addr_delete(from, from_count, | |
3263 | da->da_addr, da->da_addrlen, 0); | |
3264 | } | |
3265 | da = next; | |
3266 | } | |
3267 | } | |
3268 | ||
3269 | /** | |
3270 | * dev_unicast_sync - Synchronize device's unicast list to another device | |
3271 | * @to: destination device | |
3272 | * @from: source device | |
3273 | * | |
3274 | * Add newly added addresses to the destination device and release | |
3275 | * addresses that have no users left. The source device must be | |
3276 | * locked by netif_tx_lock_bh. | |
3277 | * | |
3278 | * This function is intended to be called from the dev->set_rx_mode | |
3279 | * function of layered software devices. | |
3280 | */ | |
3281 | int dev_unicast_sync(struct net_device *to, struct net_device *from) | |
3282 | { | |
3283 | int err = 0; | |
3284 | ||
b9e40857 | 3285 | netif_addr_lock_bh(to); |
e83a2ea8 CL |
3286 | err = __dev_addr_sync(&to->uc_list, &to->uc_count, |
3287 | &from->uc_list, &from->uc_count); | |
3288 | if (!err) | |
3289 | __dev_set_rx_mode(to); | |
b9e40857 | 3290 | netif_addr_unlock_bh(to); |
e83a2ea8 CL |
3291 | return err; |
3292 | } | |
3293 | EXPORT_SYMBOL(dev_unicast_sync); | |
3294 | ||
3295 | /** | |
bc2cda1e | 3296 | * dev_unicast_unsync - Remove synchronized addresses from the destination device |
e83a2ea8 CL |
3297 | * @to: destination device |
3298 | * @from: source device | |
3299 | * | |
3300 | * Remove all addresses that were added to the destination device by | |
3301 | * dev_unicast_sync(). This function is intended to be called from the | |
3302 | * dev->stop function of layered software devices. | |
3303 | */ | |
3304 | void dev_unicast_unsync(struct net_device *to, struct net_device *from) | |
3305 | { | |
b9e40857 | 3306 | netif_addr_lock_bh(from); |
e308a5d8 | 3307 | netif_addr_lock(to); |
e83a2ea8 CL |
3308 | |
3309 | __dev_addr_unsync(&to->uc_list, &to->uc_count, | |
3310 | &from->uc_list, &from->uc_count); | |
3311 | __dev_set_rx_mode(to); | |
3312 | ||
e308a5d8 | 3313 | netif_addr_unlock(to); |
b9e40857 | 3314 | netif_addr_unlock_bh(from); |
e83a2ea8 CL |
3315 | } |
3316 | EXPORT_SYMBOL(dev_unicast_unsync); | |
3317 | ||
12972621 DC |
3318 | static void __dev_addr_discard(struct dev_addr_list **list) |
3319 | { | |
3320 | struct dev_addr_list *tmp; | |
3321 | ||
3322 | while (*list != NULL) { | |
3323 | tmp = *list; | |
3324 | *list = tmp->next; | |
3325 | if (tmp->da_users > tmp->da_gusers) | |
3326 | printk("__dev_addr_discard: address leakage! " | |
3327 | "da_users=%d\n", tmp->da_users); | |
3328 | kfree(tmp); | |
3329 | } | |
3330 | } | |
3331 | ||
26cc2522 | 3332 | static void dev_addr_discard(struct net_device *dev) |
4417da66 | 3333 | { |
b9e40857 | 3334 | netif_addr_lock_bh(dev); |
26cc2522 | 3335 | |
4417da66 PM |
3336 | __dev_addr_discard(&dev->uc_list); |
3337 | dev->uc_count = 0; | |
4417da66 | 3338 | |
456ad75c DC |
3339 | __dev_addr_discard(&dev->mc_list); |
3340 | dev->mc_count = 0; | |
26cc2522 | 3341 | |
b9e40857 | 3342 | netif_addr_unlock_bh(dev); |
456ad75c DC |
3343 | } |
3344 | ||
f0db275a SH |
3345 | /** |
3346 | * dev_get_flags - get flags reported to userspace | |
3347 | * @dev: device | |
3348 | * | |
3349 | * Get the combination of flag bits exported through APIs to userspace. | |
3350 | */ | |
1da177e4 LT |
3351 | unsigned dev_get_flags(const struct net_device *dev) |
3352 | { | |
3353 | unsigned flags; | |
3354 | ||
3355 | flags = (dev->flags & ~(IFF_PROMISC | | |
3356 | IFF_ALLMULTI | | |
b00055aa SR |
3357 | IFF_RUNNING | |
3358 | IFF_LOWER_UP | | |
3359 | IFF_DORMANT)) | | |
1da177e4 LT |
3360 | (dev->gflags & (IFF_PROMISC | |
3361 | IFF_ALLMULTI)); | |
3362 | ||
b00055aa SR |
3363 | if (netif_running(dev)) { |
3364 | if (netif_oper_up(dev)) | |
3365 | flags |= IFF_RUNNING; | |
3366 | if (netif_carrier_ok(dev)) | |
3367 | flags |= IFF_LOWER_UP; | |
3368 | if (netif_dormant(dev)) | |
3369 | flags |= IFF_DORMANT; | |
3370 | } | |
1da177e4 LT |
3371 | |
3372 | return flags; | |
3373 | } | |
3374 | ||
f0db275a SH |
3375 | /** |
3376 | * dev_change_flags - change device settings | |
3377 | * @dev: device | |
3378 | * @flags: device state flags | |
3379 | * | |
3380 | * Change settings on device based state flags. The flags are | |
3381 | * in the userspace exported format. | |
3382 | */ | |
1da177e4 LT |
3383 | int dev_change_flags(struct net_device *dev, unsigned flags) |
3384 | { | |
7c355f53 | 3385 | int ret, changes; |
1da177e4 LT |
3386 | int old_flags = dev->flags; |
3387 | ||
24023451 PM |
3388 | ASSERT_RTNL(); |
3389 | ||
1da177e4 LT |
3390 | /* |
3391 | * Set the flags on our device. | |
3392 | */ | |
3393 | ||
3394 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
3395 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
3396 | IFF_AUTOMEDIA)) | | |
3397 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
3398 | IFF_ALLMULTI)); | |
3399 | ||
3400 | /* | |
3401 | * Load in the correct multicast list now the flags have changed. | |
3402 | */ | |
3403 | ||
b6c40d68 PM |
3404 | if ((old_flags ^ flags) & IFF_MULTICAST) |
3405 | dev_change_rx_flags(dev, IFF_MULTICAST); | |
24023451 | 3406 | |
4417da66 | 3407 | dev_set_rx_mode(dev); |
1da177e4 LT |
3408 | |
3409 | /* | |
3410 | * Have we downed the interface. We handle IFF_UP ourselves | |
3411 | * according to user attempts to set it, rather than blindly | |
3412 | * setting it. | |
3413 | */ | |
3414 | ||
3415 | ret = 0; | |
3416 | if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */ | |
3417 | ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev); | |
3418 | ||
3419 | if (!ret) | |
4417da66 | 3420 | dev_set_rx_mode(dev); |
1da177e4 LT |
3421 | } |
3422 | ||
3423 | if (dev->flags & IFF_UP && | |
3424 | ((old_flags ^ dev->flags) &~ (IFF_UP | IFF_PROMISC | IFF_ALLMULTI | | |
3425 | IFF_VOLATILE))) | |
056925ab | 3426 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
1da177e4 LT |
3427 | |
3428 | if ((flags ^ dev->gflags) & IFF_PROMISC) { | |
3429 | int inc = (flags & IFF_PROMISC) ? +1 : -1; | |
3430 | dev->gflags ^= IFF_PROMISC; | |
3431 | dev_set_promiscuity(dev, inc); | |
3432 | } | |
3433 | ||
3434 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
3435 | is important. Some (broken) drivers set IFF_PROMISC, when | |
3436 | IFF_ALLMULTI is requested not asking us and not reporting. | |
3437 | */ | |
3438 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
3439 | int inc = (flags & IFF_ALLMULTI) ? +1 : -1; | |
3440 | dev->gflags ^= IFF_ALLMULTI; | |
3441 | dev_set_allmulti(dev, inc); | |
3442 | } | |
3443 | ||
7c355f53 TG |
3444 | /* Exclude state transition flags, already notified */ |
3445 | changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING); | |
3446 | if (changes) | |
3447 | rtmsg_ifinfo(RTM_NEWLINK, dev, changes); | |
1da177e4 LT |
3448 | |
3449 | return ret; | |
3450 | } | |
3451 | ||
f0db275a SH |
3452 | /** |
3453 | * dev_set_mtu - Change maximum transfer unit | |
3454 | * @dev: device | |
3455 | * @new_mtu: new transfer unit | |
3456 | * | |
3457 | * Change the maximum transfer size of the network device. | |
3458 | */ | |
1da177e4 LT |
3459 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
3460 | { | |
3461 | int err; | |
3462 | ||
3463 | if (new_mtu == dev->mtu) | |
3464 | return 0; | |
3465 | ||
3466 | /* MTU must be positive. */ | |
3467 | if (new_mtu < 0) | |
3468 | return -EINVAL; | |
3469 | ||
3470 | if (!netif_device_present(dev)) | |
3471 | return -ENODEV; | |
3472 | ||
3473 | err = 0; | |
3474 | if (dev->change_mtu) | |
3475 | err = dev->change_mtu(dev, new_mtu); | |
3476 | else | |
3477 | dev->mtu = new_mtu; | |
3478 | if (!err && dev->flags & IFF_UP) | |
056925ab | 3479 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); |
1da177e4 LT |
3480 | return err; |
3481 | } | |
3482 | ||
f0db275a SH |
3483 | /** |
3484 | * dev_set_mac_address - Change Media Access Control Address | |
3485 | * @dev: device | |
3486 | * @sa: new address | |
3487 | * | |
3488 | * Change the hardware (MAC) address of the device | |
3489 | */ | |
1da177e4 LT |
3490 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
3491 | { | |
3492 | int err; | |
3493 | ||
3494 | if (!dev->set_mac_address) | |
3495 | return -EOPNOTSUPP; | |
3496 | if (sa->sa_family != dev->type) | |
3497 | return -EINVAL; | |
3498 | if (!netif_device_present(dev)) | |
3499 | return -ENODEV; | |
3500 | err = dev->set_mac_address(dev, sa); | |
3501 | if (!err) | |
056925ab | 3502 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
1da177e4 LT |
3503 | return err; |
3504 | } | |
3505 | ||
3506 | /* | |
14e3e079 | 3507 | * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock) |
1da177e4 | 3508 | */ |
14e3e079 | 3509 | static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd) |
1da177e4 LT |
3510 | { |
3511 | int err; | |
881d966b | 3512 | struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); |
1da177e4 LT |
3513 | |
3514 | if (!dev) | |
3515 | return -ENODEV; | |
3516 | ||
3517 | switch (cmd) { | |
3518 | case SIOCGIFFLAGS: /* Get interface flags */ | |
3519 | ifr->ifr_flags = dev_get_flags(dev); | |
3520 | return 0; | |
3521 | ||
1da177e4 LT |
3522 | case SIOCGIFMETRIC: /* Get the metric on the interface |
3523 | (currently unused) */ | |
3524 | ifr->ifr_metric = 0; | |
3525 | return 0; | |
3526 | ||
1da177e4 LT |
3527 | case SIOCGIFMTU: /* Get the MTU of a device */ |
3528 | ifr->ifr_mtu = dev->mtu; | |
3529 | return 0; | |
3530 | ||
1da177e4 LT |
3531 | case SIOCGIFHWADDR: |
3532 | if (!dev->addr_len) | |
3533 | memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data); | |
3534 | else | |
3535 | memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr, | |
3536 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); | |
3537 | ifr->ifr_hwaddr.sa_family = dev->type; | |
3538 | return 0; | |
3539 | ||
14e3e079 JG |
3540 | case SIOCGIFSLAVE: |
3541 | err = -EINVAL; | |
3542 | break; | |
3543 | ||
3544 | case SIOCGIFMAP: | |
3545 | ifr->ifr_map.mem_start = dev->mem_start; | |
3546 | ifr->ifr_map.mem_end = dev->mem_end; | |
3547 | ifr->ifr_map.base_addr = dev->base_addr; | |
3548 | ifr->ifr_map.irq = dev->irq; | |
3549 | ifr->ifr_map.dma = dev->dma; | |
3550 | ifr->ifr_map.port = dev->if_port; | |
3551 | return 0; | |
3552 | ||
3553 | case SIOCGIFINDEX: | |
3554 | ifr->ifr_ifindex = dev->ifindex; | |
3555 | return 0; | |
3556 | ||
3557 | case SIOCGIFTXQLEN: | |
3558 | ifr->ifr_qlen = dev->tx_queue_len; | |
3559 | return 0; | |
3560 | ||
3561 | default: | |
3562 | /* dev_ioctl() should ensure this case | |
3563 | * is never reached | |
3564 | */ | |
3565 | WARN_ON(1); | |
3566 | err = -EINVAL; | |
3567 | break; | |
3568 | ||
3569 | } | |
3570 | return err; | |
3571 | } | |
3572 | ||
3573 | /* | |
3574 | * Perform the SIOCxIFxxx calls, inside rtnl_lock() | |
3575 | */ | |
3576 | static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd) | |
3577 | { | |
3578 | int err; | |
3579 | struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); | |
3580 | ||
3581 | if (!dev) | |
3582 | return -ENODEV; | |
3583 | ||
3584 | switch (cmd) { | |
3585 | case SIOCSIFFLAGS: /* Set interface flags */ | |
3586 | return dev_change_flags(dev, ifr->ifr_flags); | |
3587 | ||
3588 | case SIOCSIFMETRIC: /* Set the metric on the interface | |
3589 | (currently unused) */ | |
3590 | return -EOPNOTSUPP; | |
3591 | ||
3592 | case SIOCSIFMTU: /* Set the MTU of a device */ | |
3593 | return dev_set_mtu(dev, ifr->ifr_mtu); | |
3594 | ||
1da177e4 LT |
3595 | case SIOCSIFHWADDR: |
3596 | return dev_set_mac_address(dev, &ifr->ifr_hwaddr); | |
3597 | ||
3598 | case SIOCSIFHWBROADCAST: | |
3599 | if (ifr->ifr_hwaddr.sa_family != dev->type) | |
3600 | return -EINVAL; | |
3601 | memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, | |
3602 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); | |
056925ab | 3603 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
1da177e4 LT |
3604 | return 0; |
3605 | ||
1da177e4 LT |
3606 | case SIOCSIFMAP: |
3607 | if (dev->set_config) { | |
3608 | if (!netif_device_present(dev)) | |
3609 | return -ENODEV; | |
3610 | return dev->set_config(dev, &ifr->ifr_map); | |
3611 | } | |
3612 | return -EOPNOTSUPP; | |
3613 | ||
3614 | case SIOCADDMULTI: | |
61ee6bd4 | 3615 | if ((!dev->set_multicast_list && !dev->set_rx_mode) || |
1da177e4 LT |
3616 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) |
3617 | return -EINVAL; | |
3618 | if (!netif_device_present(dev)) | |
3619 | return -ENODEV; | |
3620 | return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data, | |
3621 | dev->addr_len, 1); | |
3622 | ||
3623 | case SIOCDELMULTI: | |
61ee6bd4 | 3624 | if ((!dev->set_multicast_list && !dev->set_rx_mode) || |
1da177e4 LT |
3625 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) |
3626 | return -EINVAL; | |
3627 | if (!netif_device_present(dev)) | |
3628 | return -ENODEV; | |
3629 | return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data, | |
3630 | dev->addr_len, 1); | |
3631 | ||
1da177e4 LT |
3632 | case SIOCSIFTXQLEN: |
3633 | if (ifr->ifr_qlen < 0) | |
3634 | return -EINVAL; | |
3635 | dev->tx_queue_len = ifr->ifr_qlen; | |
3636 | return 0; | |
3637 | ||
3638 | case SIOCSIFNAME: | |
3639 | ifr->ifr_newname[IFNAMSIZ-1] = '\0'; | |
3640 | return dev_change_name(dev, ifr->ifr_newname); | |
3641 | ||
3642 | /* | |
3643 | * Unknown or private ioctl | |
3644 | */ | |
3645 | ||
3646 | default: | |
3647 | if ((cmd >= SIOCDEVPRIVATE && | |
3648 | cmd <= SIOCDEVPRIVATE + 15) || | |
3649 | cmd == SIOCBONDENSLAVE || | |
3650 | cmd == SIOCBONDRELEASE || | |
3651 | cmd == SIOCBONDSETHWADDR || | |
3652 | cmd == SIOCBONDSLAVEINFOQUERY || | |
3653 | cmd == SIOCBONDINFOQUERY || | |
3654 | cmd == SIOCBONDCHANGEACTIVE || | |
3655 | cmd == SIOCGMIIPHY || | |
3656 | cmd == SIOCGMIIREG || | |
3657 | cmd == SIOCSMIIREG || | |
3658 | cmd == SIOCBRADDIF || | |
3659 | cmd == SIOCBRDELIF || | |
3660 | cmd == SIOCWANDEV) { | |
3661 | err = -EOPNOTSUPP; | |
3662 | if (dev->do_ioctl) { | |
3663 | if (netif_device_present(dev)) | |
3664 | err = dev->do_ioctl(dev, ifr, | |
3665 | cmd); | |
3666 | else | |
3667 | err = -ENODEV; | |
3668 | } | |
3669 | } else | |
3670 | err = -EINVAL; | |
3671 | ||
3672 | } | |
3673 | return err; | |
3674 | } | |
3675 | ||
3676 | /* | |
3677 | * This function handles all "interface"-type I/O control requests. The actual | |
3678 | * 'doing' part of this is dev_ifsioc above. | |
3679 | */ | |
3680 | ||
3681 | /** | |
3682 | * dev_ioctl - network device ioctl | |
c4ea43c5 | 3683 | * @net: the applicable net namespace |
1da177e4 LT |
3684 | * @cmd: command to issue |
3685 | * @arg: pointer to a struct ifreq in user space | |
3686 | * | |
3687 | * Issue ioctl functions to devices. This is normally called by the | |
3688 | * user space syscall interfaces but can sometimes be useful for | |
3689 | * other purposes. The return value is the return from the syscall if | |
3690 | * positive or a negative errno code on error. | |
3691 | */ | |
3692 | ||
881d966b | 3693 | int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
3694 | { |
3695 | struct ifreq ifr; | |
3696 | int ret; | |
3697 | char *colon; | |
3698 | ||
3699 | /* One special case: SIOCGIFCONF takes ifconf argument | |
3700 | and requires shared lock, because it sleeps writing | |
3701 | to user space. | |
3702 | */ | |
3703 | ||
3704 | if (cmd == SIOCGIFCONF) { | |
6756ae4b | 3705 | rtnl_lock(); |
881d966b | 3706 | ret = dev_ifconf(net, (char __user *) arg); |
6756ae4b | 3707 | rtnl_unlock(); |
1da177e4 LT |
3708 | return ret; |
3709 | } | |
3710 | if (cmd == SIOCGIFNAME) | |
881d966b | 3711 | return dev_ifname(net, (struct ifreq __user *)arg); |
1da177e4 LT |
3712 | |
3713 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
3714 | return -EFAULT; | |
3715 | ||
3716 | ifr.ifr_name[IFNAMSIZ-1] = 0; | |
3717 | ||
3718 | colon = strchr(ifr.ifr_name, ':'); | |
3719 | if (colon) | |
3720 | *colon = 0; | |
3721 | ||
3722 | /* | |
3723 | * See which interface the caller is talking about. | |
3724 | */ | |
3725 | ||
3726 | switch (cmd) { | |
3727 | /* | |
3728 | * These ioctl calls: | |
3729 | * - can be done by all. | |
3730 | * - atomic and do not require locking. | |
3731 | * - return a value | |
3732 | */ | |
3733 | case SIOCGIFFLAGS: | |
3734 | case SIOCGIFMETRIC: | |
3735 | case SIOCGIFMTU: | |
3736 | case SIOCGIFHWADDR: | |
3737 | case SIOCGIFSLAVE: | |
3738 | case SIOCGIFMAP: | |
3739 | case SIOCGIFINDEX: | |
3740 | case SIOCGIFTXQLEN: | |
881d966b | 3741 | dev_load(net, ifr.ifr_name); |
1da177e4 | 3742 | read_lock(&dev_base_lock); |
14e3e079 | 3743 | ret = dev_ifsioc_locked(net, &ifr, cmd); |
1da177e4 LT |
3744 | read_unlock(&dev_base_lock); |
3745 | if (!ret) { | |
3746 | if (colon) | |
3747 | *colon = ':'; | |
3748 | if (copy_to_user(arg, &ifr, | |
3749 | sizeof(struct ifreq))) | |
3750 | ret = -EFAULT; | |
3751 | } | |
3752 | return ret; | |
3753 | ||
3754 | case SIOCETHTOOL: | |
881d966b | 3755 | dev_load(net, ifr.ifr_name); |
1da177e4 | 3756 | rtnl_lock(); |
881d966b | 3757 | ret = dev_ethtool(net, &ifr); |
1da177e4 LT |
3758 | rtnl_unlock(); |
3759 | if (!ret) { | |
3760 | if (colon) | |
3761 | *colon = ':'; | |
3762 | if (copy_to_user(arg, &ifr, | |
3763 | sizeof(struct ifreq))) | |
3764 | ret = -EFAULT; | |
3765 | } | |
3766 | return ret; | |
3767 | ||
3768 | /* | |
3769 | * These ioctl calls: | |
3770 | * - require superuser power. | |
3771 | * - require strict serialization. | |
3772 | * - return a value | |
3773 | */ | |
3774 | case SIOCGMIIPHY: | |
3775 | case SIOCGMIIREG: | |
3776 | case SIOCSIFNAME: | |
3777 | if (!capable(CAP_NET_ADMIN)) | |
3778 | return -EPERM; | |
881d966b | 3779 | dev_load(net, ifr.ifr_name); |
1da177e4 | 3780 | rtnl_lock(); |
881d966b | 3781 | ret = dev_ifsioc(net, &ifr, cmd); |
1da177e4 LT |
3782 | rtnl_unlock(); |
3783 | if (!ret) { | |
3784 | if (colon) | |
3785 | *colon = ':'; | |
3786 | if (copy_to_user(arg, &ifr, | |
3787 | sizeof(struct ifreq))) | |
3788 | ret = -EFAULT; | |
3789 | } | |
3790 | return ret; | |
3791 | ||
3792 | /* | |
3793 | * These ioctl calls: | |
3794 | * - require superuser power. | |
3795 | * - require strict serialization. | |
3796 | * - do not return a value | |
3797 | */ | |
3798 | case SIOCSIFFLAGS: | |
3799 | case SIOCSIFMETRIC: | |
3800 | case SIOCSIFMTU: | |
3801 | case SIOCSIFMAP: | |
3802 | case SIOCSIFHWADDR: | |
3803 | case SIOCSIFSLAVE: | |
3804 | case SIOCADDMULTI: | |
3805 | case SIOCDELMULTI: | |
3806 | case SIOCSIFHWBROADCAST: | |
3807 | case SIOCSIFTXQLEN: | |
3808 | case SIOCSMIIREG: | |
3809 | case SIOCBONDENSLAVE: | |
3810 | case SIOCBONDRELEASE: | |
3811 | case SIOCBONDSETHWADDR: | |
1da177e4 LT |
3812 | case SIOCBONDCHANGEACTIVE: |
3813 | case SIOCBRADDIF: | |
3814 | case SIOCBRDELIF: | |
3815 | if (!capable(CAP_NET_ADMIN)) | |
3816 | return -EPERM; | |
cabcac0b TG |
3817 | /* fall through */ |
3818 | case SIOCBONDSLAVEINFOQUERY: | |
3819 | case SIOCBONDINFOQUERY: | |
881d966b | 3820 | dev_load(net, ifr.ifr_name); |
1da177e4 | 3821 | rtnl_lock(); |
881d966b | 3822 | ret = dev_ifsioc(net, &ifr, cmd); |
1da177e4 LT |
3823 | rtnl_unlock(); |
3824 | return ret; | |
3825 | ||
3826 | case SIOCGIFMEM: | |
3827 | /* Get the per device memory space. We can add this but | |
3828 | * currently do not support it */ | |
3829 | case SIOCSIFMEM: | |
3830 | /* Set the per device memory buffer space. | |
3831 | * Not applicable in our case */ | |
3832 | case SIOCSIFLINK: | |
3833 | return -EINVAL; | |
3834 | ||
3835 | /* | |
3836 | * Unknown or private ioctl. | |
3837 | */ | |
3838 | default: | |
3839 | if (cmd == SIOCWANDEV || | |
3840 | (cmd >= SIOCDEVPRIVATE && | |
3841 | cmd <= SIOCDEVPRIVATE + 15)) { | |
881d966b | 3842 | dev_load(net, ifr.ifr_name); |
1da177e4 | 3843 | rtnl_lock(); |
881d966b | 3844 | ret = dev_ifsioc(net, &ifr, cmd); |
1da177e4 LT |
3845 | rtnl_unlock(); |
3846 | if (!ret && copy_to_user(arg, &ifr, | |
3847 | sizeof(struct ifreq))) | |
3848 | ret = -EFAULT; | |
3849 | return ret; | |
3850 | } | |
1da177e4 | 3851 | /* Take care of Wireless Extensions */ |
295f4a1f | 3852 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) |
881d966b | 3853 | return wext_handle_ioctl(net, &ifr, cmd, arg); |
1da177e4 LT |
3854 | return -EINVAL; |
3855 | } | |
3856 | } | |
3857 | ||
3858 | ||
3859 | /** | |
3860 | * dev_new_index - allocate an ifindex | |
c4ea43c5 | 3861 | * @net: the applicable net namespace |
1da177e4 LT |
3862 | * |
3863 | * Returns a suitable unique value for a new device interface | |
3864 | * number. The caller must hold the rtnl semaphore or the | |
3865 | * dev_base_lock to be sure it remains unique. | |
3866 | */ | |
881d966b | 3867 | static int dev_new_index(struct net *net) |
1da177e4 LT |
3868 | { |
3869 | static int ifindex; | |
3870 | for (;;) { | |
3871 | if (++ifindex <= 0) | |
3872 | ifindex = 1; | |
881d966b | 3873 | if (!__dev_get_by_index(net, ifindex)) |
1da177e4 LT |
3874 | return ifindex; |
3875 | } | |
3876 | } | |
3877 | ||
1da177e4 | 3878 | /* Delayed registration/unregisteration */ |
3b5b34fd | 3879 | static LIST_HEAD(net_todo_list); |
1da177e4 | 3880 | |
6f05f629 | 3881 | static void net_set_todo(struct net_device *dev) |
1da177e4 | 3882 | { |
1da177e4 | 3883 | list_add_tail(&dev->todo_list, &net_todo_list); |
1da177e4 LT |
3884 | } |
3885 | ||
93ee31f1 DL |
3886 | static void rollback_registered(struct net_device *dev) |
3887 | { | |
3888 | BUG_ON(dev_boot_phase); | |
3889 | ASSERT_RTNL(); | |
3890 | ||
3891 | /* Some devices call without registering for initialization unwind. */ | |
3892 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
3893 | printk(KERN_DEBUG "unregister_netdevice: device %s/%p never " | |
3894 | "was registered\n", dev->name, dev); | |
3895 | ||
3896 | WARN_ON(1); | |
3897 | return; | |
3898 | } | |
3899 | ||
3900 | BUG_ON(dev->reg_state != NETREG_REGISTERED); | |
3901 | ||
3902 | /* If device is running, close it first. */ | |
3903 | dev_close(dev); | |
3904 | ||
3905 | /* And unlink it from device chain. */ | |
3906 | unlist_netdevice(dev); | |
3907 | ||
3908 | dev->reg_state = NETREG_UNREGISTERING; | |
3909 | ||
3910 | synchronize_net(); | |
3911 | ||
3912 | /* Shutdown queueing discipline. */ | |
3913 | dev_shutdown(dev); | |
3914 | ||
3915 | ||
3916 | /* Notify protocols, that we are about to destroy | |
3917 | this device. They should clean all the things. | |
3918 | */ | |
3919 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
3920 | ||
3921 | /* | |
3922 | * Flush the unicast and multicast chains | |
3923 | */ | |
3924 | dev_addr_discard(dev); | |
3925 | ||
3926 | if (dev->uninit) | |
3927 | dev->uninit(dev); | |
3928 | ||
3929 | /* Notifier chain MUST detach us from master device. */ | |
547b792c | 3930 | WARN_ON(dev->master); |
93ee31f1 DL |
3931 | |
3932 | /* Remove entries from kobject tree */ | |
3933 | netdev_unregister_kobject(dev); | |
3934 | ||
3935 | synchronize_net(); | |
3936 | ||
3937 | dev_put(dev); | |
3938 | } | |
3939 | ||
e8a0464c DM |
3940 | static void __netdev_init_queue_locks_one(struct net_device *dev, |
3941 | struct netdev_queue *dev_queue, | |
3942 | void *_unused) | |
c773e847 DM |
3943 | { |
3944 | spin_lock_init(&dev_queue->_xmit_lock); | |
cf508b12 | 3945 | netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type); |
c773e847 DM |
3946 | dev_queue->xmit_lock_owner = -1; |
3947 | } | |
3948 | ||
3949 | static void netdev_init_queue_locks(struct net_device *dev) | |
3950 | { | |
e8a0464c DM |
3951 | netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL); |
3952 | __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL); | |
c773e847 DM |
3953 | } |
3954 | ||
b63365a2 HX |
3955 | unsigned long netdev_fix_features(unsigned long features, const char *name) |
3956 | { | |
3957 | /* Fix illegal SG+CSUM combinations. */ | |
3958 | if ((features & NETIF_F_SG) && | |
3959 | !(features & NETIF_F_ALL_CSUM)) { | |
3960 | if (name) | |
3961 | printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no " | |
3962 | "checksum feature.\n", name); | |
3963 | features &= ~NETIF_F_SG; | |
3964 | } | |
3965 | ||
3966 | /* TSO requires that SG is present as well. */ | |
3967 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) { | |
3968 | if (name) | |
3969 | printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no " | |
3970 | "SG feature.\n", name); | |
3971 | features &= ~NETIF_F_TSO; | |
3972 | } | |
3973 | ||
3974 | if (features & NETIF_F_UFO) { | |
3975 | if (!(features & NETIF_F_GEN_CSUM)) { | |
3976 | if (name) | |
3977 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO " | |
3978 | "since no NETIF_F_HW_CSUM feature.\n", | |
3979 | name); | |
3980 | features &= ~NETIF_F_UFO; | |
3981 | } | |
3982 | ||
3983 | if (!(features & NETIF_F_SG)) { | |
3984 | if (name) | |
3985 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO " | |
3986 | "since no NETIF_F_SG feature.\n", name); | |
3987 | features &= ~NETIF_F_UFO; | |
3988 | } | |
3989 | } | |
3990 | ||
3991 | return features; | |
3992 | } | |
3993 | EXPORT_SYMBOL(netdev_fix_features); | |
3994 | ||
1da177e4 LT |
3995 | /** |
3996 | * register_netdevice - register a network device | |
3997 | * @dev: device to register | |
3998 | * | |
3999 | * Take a completed network device structure and add it to the kernel | |
4000 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
4001 | * chain. 0 is returned on success. A negative errno code is returned | |
4002 | * on a failure to set up the device, or if the name is a duplicate. | |
4003 | * | |
4004 | * Callers must hold the rtnl semaphore. You may want | |
4005 | * register_netdev() instead of this. | |
4006 | * | |
4007 | * BUGS: | |
4008 | * The locking appears insufficient to guarantee two parallel registers | |
4009 | * will not get the same name. | |
4010 | */ | |
4011 | ||
4012 | int register_netdevice(struct net_device *dev) | |
4013 | { | |
4014 | struct hlist_head *head; | |
4015 | struct hlist_node *p; | |
4016 | int ret; | |
881d966b | 4017 | struct net *net; |
1da177e4 LT |
4018 | |
4019 | BUG_ON(dev_boot_phase); | |
4020 | ASSERT_RTNL(); | |
4021 | ||
b17a7c17 SH |
4022 | might_sleep(); |
4023 | ||
1da177e4 LT |
4024 | /* When net_device's are persistent, this will be fatal. */ |
4025 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
c346dca1 YH |
4026 | BUG_ON(!dev_net(dev)); |
4027 | net = dev_net(dev); | |
1da177e4 | 4028 | |
f1f28aa3 | 4029 | spin_lock_init(&dev->addr_list_lock); |
cf508b12 | 4030 | netdev_set_addr_lockdep_class(dev); |
c773e847 | 4031 | netdev_init_queue_locks(dev); |
1da177e4 | 4032 | |
1da177e4 LT |
4033 | dev->iflink = -1; |
4034 | ||
4035 | /* Init, if this function is available */ | |
4036 | if (dev->init) { | |
4037 | ret = dev->init(dev); | |
4038 | if (ret) { | |
4039 | if (ret > 0) | |
4040 | ret = -EIO; | |
90833aa4 | 4041 | goto out; |
1da177e4 LT |
4042 | } |
4043 | } | |
4ec93edb | 4044 | |
1da177e4 LT |
4045 | if (!dev_valid_name(dev->name)) { |
4046 | ret = -EINVAL; | |
7ce1b0ed | 4047 | goto err_uninit; |
1da177e4 LT |
4048 | } |
4049 | ||
881d966b | 4050 | dev->ifindex = dev_new_index(net); |
1da177e4 LT |
4051 | if (dev->iflink == -1) |
4052 | dev->iflink = dev->ifindex; | |
4053 | ||
4054 | /* Check for existence of name */ | |
881d966b | 4055 | head = dev_name_hash(net, dev->name); |
1da177e4 LT |
4056 | hlist_for_each(p, head) { |
4057 | struct net_device *d | |
4058 | = hlist_entry(p, struct net_device, name_hlist); | |
4059 | if (!strncmp(d->name, dev->name, IFNAMSIZ)) { | |
4060 | ret = -EEXIST; | |
7ce1b0ed | 4061 | goto err_uninit; |
1da177e4 | 4062 | } |
4ec93edb | 4063 | } |
1da177e4 | 4064 | |
d212f87b SH |
4065 | /* Fix illegal checksum combinations */ |
4066 | if ((dev->features & NETIF_F_HW_CSUM) && | |
4067 | (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
4068 | printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n", | |
4069 | dev->name); | |
4070 | dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); | |
4071 | } | |
4072 | ||
4073 | if ((dev->features & NETIF_F_NO_CSUM) && | |
4074 | (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
4075 | printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n", | |
4076 | dev->name); | |
4077 | dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM); | |
4078 | } | |
4079 | ||
b63365a2 | 4080 | dev->features = netdev_fix_features(dev->features, dev->name); |
1da177e4 | 4081 | |
e5a4a72d LB |
4082 | /* Enable software GSO if SG is supported. */ |
4083 | if (dev->features & NETIF_F_SG) | |
4084 | dev->features |= NETIF_F_GSO; | |
4085 | ||
aaf8cdc3 | 4086 | netdev_initialize_kobject(dev); |
8b41d188 | 4087 | ret = netdev_register_kobject(dev); |
b17a7c17 | 4088 | if (ret) |
7ce1b0ed | 4089 | goto err_uninit; |
b17a7c17 SH |
4090 | dev->reg_state = NETREG_REGISTERED; |
4091 | ||
1da177e4 LT |
4092 | /* |
4093 | * Default initial state at registry is that the | |
4094 | * device is present. | |
4095 | */ | |
4096 | ||
4097 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
4098 | ||
1da177e4 | 4099 | dev_init_scheduler(dev); |
1da177e4 | 4100 | dev_hold(dev); |
ce286d32 | 4101 | list_netdevice(dev); |
1da177e4 LT |
4102 | |
4103 | /* Notify protocols, that a new device appeared. */ | |
056925ab | 4104 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
fcc5a03a | 4105 | ret = notifier_to_errno(ret); |
93ee31f1 DL |
4106 | if (ret) { |
4107 | rollback_registered(dev); | |
4108 | dev->reg_state = NETREG_UNREGISTERED; | |
4109 | } | |
1da177e4 LT |
4110 | |
4111 | out: | |
4112 | return ret; | |
7ce1b0ed HX |
4113 | |
4114 | err_uninit: | |
4115 | if (dev->uninit) | |
4116 | dev->uninit(dev); | |
4117 | goto out; | |
1da177e4 LT |
4118 | } |
4119 | ||
4120 | /** | |
4121 | * register_netdev - register a network device | |
4122 | * @dev: device to register | |
4123 | * | |
4124 | * Take a completed network device structure and add it to the kernel | |
4125 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
4126 | * chain. 0 is returned on success. A negative errno code is returned | |
4127 | * on a failure to set up the device, or if the name is a duplicate. | |
4128 | * | |
38b4da38 | 4129 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
4130 | * and expands the device name if you passed a format string to |
4131 | * alloc_netdev. | |
4132 | */ | |
4133 | int register_netdev(struct net_device *dev) | |
4134 | { | |
4135 | int err; | |
4136 | ||
4137 | rtnl_lock(); | |
4138 | ||
4139 | /* | |
4140 | * If the name is a format string the caller wants us to do a | |
4141 | * name allocation. | |
4142 | */ | |
4143 | if (strchr(dev->name, '%')) { | |
4144 | err = dev_alloc_name(dev, dev->name); | |
4145 | if (err < 0) | |
4146 | goto out; | |
4147 | } | |
4ec93edb | 4148 | |
1da177e4 LT |
4149 | err = register_netdevice(dev); |
4150 | out: | |
4151 | rtnl_unlock(); | |
4152 | return err; | |
4153 | } | |
4154 | EXPORT_SYMBOL(register_netdev); | |
4155 | ||
4156 | /* | |
4157 | * netdev_wait_allrefs - wait until all references are gone. | |
4158 | * | |
4159 | * This is called when unregistering network devices. | |
4160 | * | |
4161 | * Any protocol or device that holds a reference should register | |
4162 | * for netdevice notification, and cleanup and put back the | |
4163 | * reference if they receive an UNREGISTER event. | |
4164 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 4165 | * call dev_put. |
1da177e4 LT |
4166 | */ |
4167 | static void netdev_wait_allrefs(struct net_device *dev) | |
4168 | { | |
4169 | unsigned long rebroadcast_time, warning_time; | |
4170 | ||
4171 | rebroadcast_time = warning_time = jiffies; | |
4172 | while (atomic_read(&dev->refcnt) != 0) { | |
4173 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { | |
6756ae4b | 4174 | rtnl_lock(); |
1da177e4 LT |
4175 | |
4176 | /* Rebroadcast unregister notification */ | |
056925ab | 4177 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
1da177e4 LT |
4178 | |
4179 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, | |
4180 | &dev->state)) { | |
4181 | /* We must not have linkwatch events | |
4182 | * pending on unregister. If this | |
4183 | * happens, we simply run the queue | |
4184 | * unscheduled, resulting in a noop | |
4185 | * for this device. | |
4186 | */ | |
4187 | linkwatch_run_queue(); | |
4188 | } | |
4189 | ||
6756ae4b | 4190 | __rtnl_unlock(); |
1da177e4 LT |
4191 | |
4192 | rebroadcast_time = jiffies; | |
4193 | } | |
4194 | ||
4195 | msleep(250); | |
4196 | ||
4197 | if (time_after(jiffies, warning_time + 10 * HZ)) { | |
4198 | printk(KERN_EMERG "unregister_netdevice: " | |
4199 | "waiting for %s to become free. Usage " | |
4200 | "count = %d\n", | |
4201 | dev->name, atomic_read(&dev->refcnt)); | |
4202 | warning_time = jiffies; | |
4203 | } | |
4204 | } | |
4205 | } | |
4206 | ||
4207 | /* The sequence is: | |
4208 | * | |
4209 | * rtnl_lock(); | |
4210 | * ... | |
4211 | * register_netdevice(x1); | |
4212 | * register_netdevice(x2); | |
4213 | * ... | |
4214 | * unregister_netdevice(y1); | |
4215 | * unregister_netdevice(y2); | |
4216 | * ... | |
4217 | * rtnl_unlock(); | |
4218 | * free_netdev(y1); | |
4219 | * free_netdev(y2); | |
4220 | * | |
58ec3b4d | 4221 | * We are invoked by rtnl_unlock(). |
1da177e4 | 4222 | * This allows us to deal with problems: |
b17a7c17 | 4223 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
4224 | * without deadlocking with linkwatch via keventd. |
4225 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
4226 | * safely in order to wait for the netdev refcnt to drop to zero. | |
58ec3b4d HX |
4227 | * |
4228 | * We must not return until all unregister events added during | |
4229 | * the interval the lock was held have been completed. | |
1da177e4 | 4230 | */ |
1da177e4 LT |
4231 | void netdev_run_todo(void) |
4232 | { | |
626ab0e6 | 4233 | struct list_head list; |
1da177e4 | 4234 | |
1da177e4 | 4235 | /* Snapshot list, allow later requests */ |
626ab0e6 | 4236 | list_replace_init(&net_todo_list, &list); |
58ec3b4d HX |
4237 | |
4238 | __rtnl_unlock(); | |
626ab0e6 | 4239 | |
1da177e4 LT |
4240 | while (!list_empty(&list)) { |
4241 | struct net_device *dev | |
4242 | = list_entry(list.next, struct net_device, todo_list); | |
4243 | list_del(&dev->todo_list); | |
4244 | ||
b17a7c17 SH |
4245 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
4246 | printk(KERN_ERR "network todo '%s' but state %d\n", | |
4247 | dev->name, dev->reg_state); | |
4248 | dump_stack(); | |
4249 | continue; | |
4250 | } | |
1da177e4 | 4251 | |
b17a7c17 | 4252 | dev->reg_state = NETREG_UNREGISTERED; |
1da177e4 | 4253 | |
6e583ce5 SH |
4254 | on_each_cpu(flush_backlog, dev, 1); |
4255 | ||
b17a7c17 | 4256 | netdev_wait_allrefs(dev); |
1da177e4 | 4257 | |
b17a7c17 SH |
4258 | /* paranoia */ |
4259 | BUG_ON(atomic_read(&dev->refcnt)); | |
547b792c IJ |
4260 | WARN_ON(dev->ip_ptr); |
4261 | WARN_ON(dev->ip6_ptr); | |
4262 | WARN_ON(dev->dn_ptr); | |
1da177e4 | 4263 | |
b17a7c17 SH |
4264 | if (dev->destructor) |
4265 | dev->destructor(dev); | |
9093bbb2 SH |
4266 | |
4267 | /* Free network device */ | |
4268 | kobject_put(&dev->dev.kobj); | |
1da177e4 | 4269 | } |
1da177e4 LT |
4270 | } |
4271 | ||
5a1b5898 | 4272 | static struct net_device_stats *internal_stats(struct net_device *dev) |
c45d286e | 4273 | { |
5a1b5898 | 4274 | return &dev->stats; |
c45d286e RR |
4275 | } |
4276 | ||
dc2b4847 | 4277 | static void netdev_init_one_queue(struct net_device *dev, |
e8a0464c DM |
4278 | struct netdev_queue *queue, |
4279 | void *_unused) | |
dc2b4847 | 4280 | { |
dc2b4847 DM |
4281 | queue->dev = dev; |
4282 | } | |
4283 | ||
bb949fbd DM |
4284 | static void netdev_init_queues(struct net_device *dev) |
4285 | { | |
e8a0464c DM |
4286 | netdev_init_one_queue(dev, &dev->rx_queue, NULL); |
4287 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); | |
c3f26a26 | 4288 | spin_lock_init(&dev->tx_global_lock); |
bb949fbd DM |
4289 | } |
4290 | ||
1da177e4 | 4291 | /** |
f25f4e44 | 4292 | * alloc_netdev_mq - allocate network device |
1da177e4 LT |
4293 | * @sizeof_priv: size of private data to allocate space for |
4294 | * @name: device name format string | |
4295 | * @setup: callback to initialize device | |
f25f4e44 | 4296 | * @queue_count: the number of subqueues to allocate |
1da177e4 LT |
4297 | * |
4298 | * Allocates a struct net_device with private data area for driver use | |
f25f4e44 PWJ |
4299 | * and performs basic initialization. Also allocates subquue structs |
4300 | * for each queue on the device at the end of the netdevice. | |
1da177e4 | 4301 | */ |
f25f4e44 PWJ |
4302 | struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, |
4303 | void (*setup)(struct net_device *), unsigned int queue_count) | |
1da177e4 | 4304 | { |
e8a0464c | 4305 | struct netdev_queue *tx; |
1da177e4 | 4306 | struct net_device *dev; |
7943986c | 4307 | size_t alloc_size; |
e8a0464c | 4308 | void *p; |
1da177e4 | 4309 | |
b6fe17d6 SH |
4310 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
4311 | ||
fd2ea0a7 | 4312 | alloc_size = sizeof(struct net_device); |
d1643d24 AD |
4313 | if (sizeof_priv) { |
4314 | /* ensure 32-byte alignment of private area */ | |
4315 | alloc_size = (alloc_size + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST; | |
4316 | alloc_size += sizeof_priv; | |
4317 | } | |
4318 | /* ensure 32-byte alignment of whole construct */ | |
4319 | alloc_size += NETDEV_ALIGN_CONST; | |
1da177e4 | 4320 | |
31380de9 | 4321 | p = kzalloc(alloc_size, GFP_KERNEL); |
1da177e4 | 4322 | if (!p) { |
b6fe17d6 | 4323 | printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n"); |
1da177e4 LT |
4324 | return NULL; |
4325 | } | |
1da177e4 | 4326 | |
7943986c | 4327 | tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL); |
e8a0464c DM |
4328 | if (!tx) { |
4329 | printk(KERN_ERR "alloc_netdev: Unable to allocate " | |
4330 | "tx qdiscs.\n"); | |
4331 | kfree(p); | |
4332 | return NULL; | |
4333 | } | |
4334 | ||
1da177e4 LT |
4335 | dev = (struct net_device *) |
4336 | (((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST); | |
4337 | dev->padded = (char *)dev - (char *)p; | |
c346dca1 | 4338 | dev_net_set(dev, &init_net); |
1da177e4 | 4339 | |
e8a0464c DM |
4340 | dev->_tx = tx; |
4341 | dev->num_tx_queues = queue_count; | |
fd2ea0a7 | 4342 | dev->real_num_tx_queues = queue_count; |
e8a0464c | 4343 | |
f25f4e44 PWJ |
4344 | if (sizeof_priv) { |
4345 | dev->priv = ((char *)dev + | |
fd2ea0a7 | 4346 | ((sizeof(struct net_device) + NETDEV_ALIGN_CONST) |
f25f4e44 PWJ |
4347 | & ~NETDEV_ALIGN_CONST)); |
4348 | } | |
4349 | ||
82cc1a7a | 4350 | dev->gso_max_size = GSO_MAX_SIZE; |
1da177e4 | 4351 | |
bb949fbd DM |
4352 | netdev_init_queues(dev); |
4353 | ||
5a1b5898 | 4354 | dev->get_stats = internal_stats; |
bea3348e | 4355 | netpoll_netdev_init(dev); |
1da177e4 LT |
4356 | setup(dev); |
4357 | strcpy(dev->name, name); | |
4358 | return dev; | |
4359 | } | |
f25f4e44 | 4360 | EXPORT_SYMBOL(alloc_netdev_mq); |
1da177e4 LT |
4361 | |
4362 | /** | |
4363 | * free_netdev - free network device | |
4364 | * @dev: device | |
4365 | * | |
4ec93edb YH |
4366 | * This function does the last stage of destroying an allocated device |
4367 | * interface. The reference to the device object is released. | |
1da177e4 LT |
4368 | * If this is the last reference then it will be freed. |
4369 | */ | |
4370 | void free_netdev(struct net_device *dev) | |
4371 | { | |
f3005d7f DL |
4372 | release_net(dev_net(dev)); |
4373 | ||
e8a0464c DM |
4374 | kfree(dev->_tx); |
4375 | ||
3041a069 | 4376 | /* Compatibility with error handling in drivers */ |
1da177e4 LT |
4377 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
4378 | kfree((char *)dev - dev->padded); | |
4379 | return; | |
4380 | } | |
4381 | ||
4382 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
4383 | dev->reg_state = NETREG_RELEASED; | |
4384 | ||
43cb76d9 GKH |
4385 | /* will free via device release */ |
4386 | put_device(&dev->dev); | |
1da177e4 | 4387 | } |
4ec93edb | 4388 | |
f0db275a SH |
4389 | /** |
4390 | * synchronize_net - Synchronize with packet receive processing | |
4391 | * | |
4392 | * Wait for packets currently being received to be done. | |
4393 | * Does not block later packets from starting. | |
4394 | */ | |
4ec93edb | 4395 | void synchronize_net(void) |
1da177e4 LT |
4396 | { |
4397 | might_sleep(); | |
fbd568a3 | 4398 | synchronize_rcu(); |
1da177e4 LT |
4399 | } |
4400 | ||
4401 | /** | |
4402 | * unregister_netdevice - remove device from the kernel | |
4403 | * @dev: device | |
4404 | * | |
4405 | * This function shuts down a device interface and removes it | |
d59b54b1 | 4406 | * from the kernel tables. |
1da177e4 LT |
4407 | * |
4408 | * Callers must hold the rtnl semaphore. You may want | |
4409 | * unregister_netdev() instead of this. | |
4410 | */ | |
4411 | ||
22f8cde5 | 4412 | void unregister_netdevice(struct net_device *dev) |
1da177e4 | 4413 | { |
a6620712 HX |
4414 | ASSERT_RTNL(); |
4415 | ||
93ee31f1 | 4416 | rollback_registered(dev); |
1da177e4 LT |
4417 | /* Finish processing unregister after unlock */ |
4418 | net_set_todo(dev); | |
1da177e4 LT |
4419 | } |
4420 | ||
4421 | /** | |
4422 | * unregister_netdev - remove device from the kernel | |
4423 | * @dev: device | |
4424 | * | |
4425 | * This function shuts down a device interface and removes it | |
d59b54b1 | 4426 | * from the kernel tables. |
1da177e4 LT |
4427 | * |
4428 | * This is just a wrapper for unregister_netdevice that takes | |
4429 | * the rtnl semaphore. In general you want to use this and not | |
4430 | * unregister_netdevice. | |
4431 | */ | |
4432 | void unregister_netdev(struct net_device *dev) | |
4433 | { | |
4434 | rtnl_lock(); | |
4435 | unregister_netdevice(dev); | |
4436 | rtnl_unlock(); | |
4437 | } | |
4438 | ||
4439 | EXPORT_SYMBOL(unregister_netdev); | |
4440 | ||
ce286d32 EB |
4441 | /** |
4442 | * dev_change_net_namespace - move device to different nethost namespace | |
4443 | * @dev: device | |
4444 | * @net: network namespace | |
4445 | * @pat: If not NULL name pattern to try if the current device name | |
4446 | * is already taken in the destination network namespace. | |
4447 | * | |
4448 | * This function shuts down a device interface and moves it | |
4449 | * to a new network namespace. On success 0 is returned, on | |
4450 | * a failure a netagive errno code is returned. | |
4451 | * | |
4452 | * Callers must hold the rtnl semaphore. | |
4453 | */ | |
4454 | ||
4455 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) | |
4456 | { | |
4457 | char buf[IFNAMSIZ]; | |
4458 | const char *destname; | |
4459 | int err; | |
4460 | ||
4461 | ASSERT_RTNL(); | |
4462 | ||
4463 | /* Don't allow namespace local devices to be moved. */ | |
4464 | err = -EINVAL; | |
4465 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
4466 | goto out; | |
4467 | ||
3891845e EB |
4468 | #ifdef CONFIG_SYSFS |
4469 | /* Don't allow real devices to be moved when sysfs | |
4470 | * is enabled. | |
4471 | */ | |
4472 | err = -EINVAL; | |
4473 | if (dev->dev.parent) | |
4474 | goto out; | |
4475 | #endif | |
4476 | ||
ce286d32 EB |
4477 | /* Ensure the device has been registrered */ |
4478 | err = -EINVAL; | |
4479 | if (dev->reg_state != NETREG_REGISTERED) | |
4480 | goto out; | |
4481 | ||
4482 | /* Get out if there is nothing todo */ | |
4483 | err = 0; | |
878628fb | 4484 | if (net_eq(dev_net(dev), net)) |
ce286d32 EB |
4485 | goto out; |
4486 | ||
4487 | /* Pick the destination device name, and ensure | |
4488 | * we can use it in the destination network namespace. | |
4489 | */ | |
4490 | err = -EEXIST; | |
4491 | destname = dev->name; | |
4492 | if (__dev_get_by_name(net, destname)) { | |
4493 | /* We get here if we can't use the current device name */ | |
4494 | if (!pat) | |
4495 | goto out; | |
4496 | if (!dev_valid_name(pat)) | |
4497 | goto out; | |
4498 | if (strchr(pat, '%')) { | |
4499 | if (__dev_alloc_name(net, pat, buf) < 0) | |
4500 | goto out; | |
4501 | destname = buf; | |
4502 | } else | |
4503 | destname = pat; | |
4504 | if (__dev_get_by_name(net, destname)) | |
4505 | goto out; | |
4506 | } | |
4507 | ||
4508 | /* | |
4509 | * And now a mini version of register_netdevice unregister_netdevice. | |
4510 | */ | |
4511 | ||
4512 | /* If device is running close it first. */ | |
9b772652 | 4513 | dev_close(dev); |
ce286d32 EB |
4514 | |
4515 | /* And unlink it from device chain */ | |
4516 | err = -ENODEV; | |
4517 | unlist_netdevice(dev); | |
4518 | ||
4519 | synchronize_net(); | |
4520 | ||
4521 | /* Shutdown queueing discipline. */ | |
4522 | dev_shutdown(dev); | |
4523 | ||
4524 | /* Notify protocols, that we are about to destroy | |
4525 | this device. They should clean all the things. | |
4526 | */ | |
4527 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
4528 | ||
4529 | /* | |
4530 | * Flush the unicast and multicast chains | |
4531 | */ | |
4532 | dev_addr_discard(dev); | |
4533 | ||
3891845e EB |
4534 | netdev_unregister_kobject(dev); |
4535 | ||
ce286d32 | 4536 | /* Actually switch the network namespace */ |
c346dca1 | 4537 | dev_net_set(dev, net); |
ce286d32 EB |
4538 | |
4539 | /* Assign the new device name */ | |
4540 | if (destname != dev->name) | |
4541 | strcpy(dev->name, destname); | |
4542 | ||
4543 | /* If there is an ifindex conflict assign a new one */ | |
4544 | if (__dev_get_by_index(net, dev->ifindex)) { | |
4545 | int iflink = (dev->iflink == dev->ifindex); | |
4546 | dev->ifindex = dev_new_index(net); | |
4547 | if (iflink) | |
4548 | dev->iflink = dev->ifindex; | |
4549 | } | |
4550 | ||
8b41d188 | 4551 | /* Fixup kobjects */ |
aaf8cdc3 | 4552 | err = netdev_register_kobject(dev); |
8b41d188 | 4553 | WARN_ON(err); |
ce286d32 EB |
4554 | |
4555 | /* Add the device back in the hashes */ | |
4556 | list_netdevice(dev); | |
4557 | ||
4558 | /* Notify protocols, that a new device appeared. */ | |
4559 | call_netdevice_notifiers(NETDEV_REGISTER, dev); | |
4560 | ||
4561 | synchronize_net(); | |
4562 | err = 0; | |
4563 | out: | |
4564 | return err; | |
4565 | } | |
4566 | ||
1da177e4 LT |
4567 | static int dev_cpu_callback(struct notifier_block *nfb, |
4568 | unsigned long action, | |
4569 | void *ocpu) | |
4570 | { | |
4571 | struct sk_buff **list_skb; | |
37437bb2 | 4572 | struct Qdisc **list_net; |
1da177e4 LT |
4573 | struct sk_buff *skb; |
4574 | unsigned int cpu, oldcpu = (unsigned long)ocpu; | |
4575 | struct softnet_data *sd, *oldsd; | |
4576 | ||
8bb78442 | 4577 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
1da177e4 LT |
4578 | return NOTIFY_OK; |
4579 | ||
4580 | local_irq_disable(); | |
4581 | cpu = smp_processor_id(); | |
4582 | sd = &per_cpu(softnet_data, cpu); | |
4583 | oldsd = &per_cpu(softnet_data, oldcpu); | |
4584 | ||
4585 | /* Find end of our completion_queue. */ | |
4586 | list_skb = &sd->completion_queue; | |
4587 | while (*list_skb) | |
4588 | list_skb = &(*list_skb)->next; | |
4589 | /* Append completion queue from offline CPU. */ | |
4590 | *list_skb = oldsd->completion_queue; | |
4591 | oldsd->completion_queue = NULL; | |
4592 | ||
4593 | /* Find end of our output_queue. */ | |
4594 | list_net = &sd->output_queue; | |
4595 | while (*list_net) | |
4596 | list_net = &(*list_net)->next_sched; | |
4597 | /* Append output queue from offline CPU. */ | |
4598 | *list_net = oldsd->output_queue; | |
4599 | oldsd->output_queue = NULL; | |
4600 | ||
4601 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
4602 | local_irq_enable(); | |
4603 | ||
4604 | /* Process offline CPU's input_pkt_queue */ | |
4605 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) | |
4606 | netif_rx(skb); | |
4607 | ||
4608 | return NOTIFY_OK; | |
4609 | } | |
1da177e4 | 4610 | |
db217334 CL |
4611 | #ifdef CONFIG_NET_DMA |
4612 | /** | |
0ed72ec4 RD |
4613 | * net_dma_rebalance - try to maintain one DMA channel per CPU |
4614 | * @net_dma: DMA client and associated data (lock, channels, channel_mask) | |
4615 | * | |
4616 | * This is called when the number of channels allocated to the net_dma client | |
4617 | * changes. The net_dma client tries to have one DMA channel per CPU. | |
db217334 | 4618 | */ |
d379b01e DW |
4619 | |
4620 | static void net_dma_rebalance(struct net_dma *net_dma) | |
db217334 | 4621 | { |
d379b01e | 4622 | unsigned int cpu, i, n, chan_idx; |
db217334 CL |
4623 | struct dma_chan *chan; |
4624 | ||
d379b01e | 4625 | if (cpus_empty(net_dma->channel_mask)) { |
db217334 | 4626 | for_each_online_cpu(cpu) |
29bbd72d | 4627 | rcu_assign_pointer(per_cpu(softnet_data, cpu).net_dma, NULL); |
db217334 CL |
4628 | return; |
4629 | } | |
4630 | ||
4631 | i = 0; | |
4632 | cpu = first_cpu(cpu_online_map); | |
4633 | ||
0e12f848 | 4634 | for_each_cpu_mask_nr(chan_idx, net_dma->channel_mask) { |
d379b01e DW |
4635 | chan = net_dma->channels[chan_idx]; |
4636 | ||
4637 | n = ((num_online_cpus() / cpus_weight(net_dma->channel_mask)) | |
4638 | + (i < (num_online_cpus() % | |
4639 | cpus_weight(net_dma->channel_mask)) ? 1 : 0)); | |
db217334 CL |
4640 | |
4641 | while(n) { | |
29bbd72d | 4642 | per_cpu(softnet_data, cpu).net_dma = chan; |
db217334 CL |
4643 | cpu = next_cpu(cpu, cpu_online_map); |
4644 | n--; | |
4645 | } | |
4646 | i++; | |
4647 | } | |
db217334 CL |
4648 | } |
4649 | ||
4650 | /** | |
4651 | * netdev_dma_event - event callback for the net_dma_client | |
4652 | * @client: should always be net_dma_client | |
f4b8ea78 | 4653 | * @chan: DMA channel for the event |
0ed72ec4 | 4654 | * @state: DMA state to be handled |
db217334 | 4655 | */ |
d379b01e DW |
4656 | static enum dma_state_client |
4657 | netdev_dma_event(struct dma_client *client, struct dma_chan *chan, | |
4658 | enum dma_state state) | |
4659 | { | |
4660 | int i, found = 0, pos = -1; | |
4661 | struct net_dma *net_dma = | |
4662 | container_of(client, struct net_dma, client); | |
4663 | enum dma_state_client ack = DMA_DUP; /* default: take no action */ | |
4664 | ||
4665 | spin_lock(&net_dma->lock); | |
4666 | switch (state) { | |
4667 | case DMA_RESOURCE_AVAILABLE: | |
0c0b0aca | 4668 | for (i = 0; i < nr_cpu_ids; i++) |
d379b01e DW |
4669 | if (net_dma->channels[i] == chan) { |
4670 | found = 1; | |
4671 | break; | |
4672 | } else if (net_dma->channels[i] == NULL && pos < 0) | |
4673 | pos = i; | |
4674 | ||
4675 | if (!found && pos >= 0) { | |
4676 | ack = DMA_ACK; | |
4677 | net_dma->channels[pos] = chan; | |
4678 | cpu_set(pos, net_dma->channel_mask); | |
4679 | net_dma_rebalance(net_dma); | |
4680 | } | |
db217334 CL |
4681 | break; |
4682 | case DMA_RESOURCE_REMOVED: | |
0c0b0aca | 4683 | for (i = 0; i < nr_cpu_ids; i++) |
d379b01e DW |
4684 | if (net_dma->channels[i] == chan) { |
4685 | found = 1; | |
4686 | pos = i; | |
4687 | break; | |
4688 | } | |
4689 | ||
4690 | if (found) { | |
4691 | ack = DMA_ACK; | |
4692 | cpu_clear(pos, net_dma->channel_mask); | |
4693 | net_dma->channels[i] = NULL; | |
4694 | net_dma_rebalance(net_dma); | |
4695 | } | |
db217334 CL |
4696 | break; |
4697 | default: | |
4698 | break; | |
4699 | } | |
d379b01e DW |
4700 | spin_unlock(&net_dma->lock); |
4701 | ||
4702 | return ack; | |
db217334 CL |
4703 | } |
4704 | ||
4705 | /** | |
f0db275a | 4706 | * netdev_dma_register - register the networking subsystem as a DMA client |
db217334 CL |
4707 | */ |
4708 | static int __init netdev_dma_register(void) | |
4709 | { | |
0c0b0aca MT |
4710 | net_dma.channels = kzalloc(nr_cpu_ids * sizeof(struct net_dma), |
4711 | GFP_KERNEL); | |
4712 | if (unlikely(!net_dma.channels)) { | |
4713 | printk(KERN_NOTICE | |
4714 | "netdev_dma: no memory for net_dma.channels\n"); | |
4715 | return -ENOMEM; | |
4716 | } | |
d379b01e DW |
4717 | spin_lock_init(&net_dma.lock); |
4718 | dma_cap_set(DMA_MEMCPY, net_dma.client.cap_mask); | |
4719 | dma_async_client_register(&net_dma.client); | |
4720 | dma_async_client_chan_request(&net_dma.client); | |
db217334 CL |
4721 | return 0; |
4722 | } | |
4723 | ||
4724 | #else | |
4725 | static int __init netdev_dma_register(void) { return -ENODEV; } | |
4726 | #endif /* CONFIG_NET_DMA */ | |
1da177e4 | 4727 | |
7f353bf2 | 4728 | /** |
b63365a2 HX |
4729 | * netdev_increment_features - increment feature set by one |
4730 | * @all: current feature set | |
4731 | * @one: new feature set | |
4732 | * @mask: mask feature set | |
7f353bf2 HX |
4733 | * |
4734 | * Computes a new feature set after adding a device with feature set | |
b63365a2 HX |
4735 | * @one to the master device with current feature set @all. Will not |
4736 | * enable anything that is off in @mask. Returns the new feature set. | |
7f353bf2 | 4737 | */ |
b63365a2 HX |
4738 | unsigned long netdev_increment_features(unsigned long all, unsigned long one, |
4739 | unsigned long mask) | |
4740 | { | |
4741 | /* If device needs checksumming, downgrade to it. */ | |
4742 | if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM)) | |
4743 | all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM); | |
4744 | else if (mask & NETIF_F_ALL_CSUM) { | |
4745 | /* If one device supports v4/v6 checksumming, set for all. */ | |
4746 | if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) && | |
4747 | !(all & NETIF_F_GEN_CSUM)) { | |
4748 | all &= ~NETIF_F_ALL_CSUM; | |
4749 | all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM); | |
4750 | } | |
e2a6b852 | 4751 | |
b63365a2 HX |
4752 | /* If one device supports hw checksumming, set for all. */ |
4753 | if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) { | |
4754 | all &= ~NETIF_F_ALL_CSUM; | |
4755 | all |= NETIF_F_HW_CSUM; | |
4756 | } | |
4757 | } | |
7f353bf2 | 4758 | |
b63365a2 | 4759 | one |= NETIF_F_ALL_CSUM; |
7f353bf2 | 4760 | |
b63365a2 HX |
4761 | one |= all & NETIF_F_ONE_FOR_ALL; |
4762 | all &= one | NETIF_F_LLTX | NETIF_F_GSO; | |
4763 | all |= one & mask & NETIF_F_ONE_FOR_ALL; | |
7f353bf2 HX |
4764 | |
4765 | return all; | |
4766 | } | |
b63365a2 | 4767 | EXPORT_SYMBOL(netdev_increment_features); |
7f353bf2 | 4768 | |
30d97d35 PE |
4769 | static struct hlist_head *netdev_create_hash(void) |
4770 | { | |
4771 | int i; | |
4772 | struct hlist_head *hash; | |
4773 | ||
4774 | hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); | |
4775 | if (hash != NULL) | |
4776 | for (i = 0; i < NETDEV_HASHENTRIES; i++) | |
4777 | INIT_HLIST_HEAD(&hash[i]); | |
4778 | ||
4779 | return hash; | |
4780 | } | |
4781 | ||
881d966b | 4782 | /* Initialize per network namespace state */ |
4665079c | 4783 | static int __net_init netdev_init(struct net *net) |
881d966b | 4784 | { |
881d966b | 4785 | INIT_LIST_HEAD(&net->dev_base_head); |
881d966b | 4786 | |
30d97d35 PE |
4787 | net->dev_name_head = netdev_create_hash(); |
4788 | if (net->dev_name_head == NULL) | |
4789 | goto err_name; | |
881d966b | 4790 | |
30d97d35 PE |
4791 | net->dev_index_head = netdev_create_hash(); |
4792 | if (net->dev_index_head == NULL) | |
4793 | goto err_idx; | |
881d966b EB |
4794 | |
4795 | return 0; | |
30d97d35 PE |
4796 | |
4797 | err_idx: | |
4798 | kfree(net->dev_name_head); | |
4799 | err_name: | |
4800 | return -ENOMEM; | |
881d966b EB |
4801 | } |
4802 | ||
f0db275a SH |
4803 | /** |
4804 | * netdev_drivername - network driver for the device | |
4805 | * @dev: network device | |
4806 | * @buffer: buffer for resulting name | |
4807 | * @len: size of buffer | |
4808 | * | |
4809 | * Determine network driver for device. | |
4810 | */ | |
cf04a4c7 | 4811 | char *netdev_drivername(const struct net_device *dev, char *buffer, int len) |
6579e57b | 4812 | { |
cf04a4c7 SH |
4813 | const struct device_driver *driver; |
4814 | const struct device *parent; | |
6579e57b AV |
4815 | |
4816 | if (len <= 0 || !buffer) | |
4817 | return buffer; | |
4818 | buffer[0] = 0; | |
4819 | ||
4820 | parent = dev->dev.parent; | |
4821 | ||
4822 | if (!parent) | |
4823 | return buffer; | |
4824 | ||
4825 | driver = parent->driver; | |
4826 | if (driver && driver->name) | |
4827 | strlcpy(buffer, driver->name, len); | |
4828 | return buffer; | |
4829 | } | |
4830 | ||
4665079c | 4831 | static void __net_exit netdev_exit(struct net *net) |
881d966b EB |
4832 | { |
4833 | kfree(net->dev_name_head); | |
4834 | kfree(net->dev_index_head); | |
4835 | } | |
4836 | ||
022cbae6 | 4837 | static struct pernet_operations __net_initdata netdev_net_ops = { |
881d966b EB |
4838 | .init = netdev_init, |
4839 | .exit = netdev_exit, | |
4840 | }; | |
4841 | ||
4665079c | 4842 | static void __net_exit default_device_exit(struct net *net) |
ce286d32 EB |
4843 | { |
4844 | struct net_device *dev, *next; | |
4845 | /* | |
4846 | * Push all migratable of the network devices back to the | |
4847 | * initial network namespace | |
4848 | */ | |
4849 | rtnl_lock(); | |
4850 | for_each_netdev_safe(net, dev, next) { | |
4851 | int err; | |
aca51397 | 4852 | char fb_name[IFNAMSIZ]; |
ce286d32 EB |
4853 | |
4854 | /* Ignore unmoveable devices (i.e. loopback) */ | |
4855 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
4856 | continue; | |
4857 | ||
4858 | /* Push remaing network devices to init_net */ | |
aca51397 PE |
4859 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
4860 | err = dev_change_net_namespace(dev, &init_net, fb_name); | |
ce286d32 | 4861 | if (err) { |
aca51397 | 4862 | printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n", |
ce286d32 | 4863 | __func__, dev->name, err); |
aca51397 | 4864 | BUG(); |
ce286d32 EB |
4865 | } |
4866 | } | |
4867 | rtnl_unlock(); | |
4868 | } | |
4869 | ||
022cbae6 | 4870 | static struct pernet_operations __net_initdata default_device_ops = { |
ce286d32 EB |
4871 | .exit = default_device_exit, |
4872 | }; | |
4873 | ||
1da177e4 LT |
4874 | /* |
4875 | * Initialize the DEV module. At boot time this walks the device list and | |
4876 | * unhooks any devices that fail to initialise (normally hardware not | |
4877 | * present) and leaves us with a valid list of present and active devices. | |
4878 | * | |
4879 | */ | |
4880 | ||
4881 | /* | |
4882 | * This is called single threaded during boot, so no need | |
4883 | * to take the rtnl semaphore. | |
4884 | */ | |
4885 | static int __init net_dev_init(void) | |
4886 | { | |
4887 | int i, rc = -ENOMEM; | |
4888 | ||
4889 | BUG_ON(!dev_boot_phase); | |
4890 | ||
1da177e4 LT |
4891 | if (dev_proc_init()) |
4892 | goto out; | |
4893 | ||
8b41d188 | 4894 | if (netdev_kobject_init()) |
1da177e4 LT |
4895 | goto out; |
4896 | ||
4897 | INIT_LIST_HEAD(&ptype_all); | |
82d8a867 | 4898 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
1da177e4 LT |
4899 | INIT_LIST_HEAD(&ptype_base[i]); |
4900 | ||
881d966b EB |
4901 | if (register_pernet_subsys(&netdev_net_ops)) |
4902 | goto out; | |
1da177e4 | 4903 | |
ce286d32 EB |
4904 | if (register_pernet_device(&default_device_ops)) |
4905 | goto out; | |
4906 | ||
1da177e4 LT |
4907 | /* |
4908 | * Initialise the packet receive queues. | |
4909 | */ | |
4910 | ||
6f912042 | 4911 | for_each_possible_cpu(i) { |
1da177e4 LT |
4912 | struct softnet_data *queue; |
4913 | ||
4914 | queue = &per_cpu(softnet_data, i); | |
4915 | skb_queue_head_init(&queue->input_pkt_queue); | |
1da177e4 LT |
4916 | queue->completion_queue = NULL; |
4917 | INIT_LIST_HEAD(&queue->poll_list); | |
bea3348e SH |
4918 | |
4919 | queue->backlog.poll = process_backlog; | |
4920 | queue->backlog.weight = weight_p; | |
1da177e4 LT |
4921 | } |
4922 | ||
db217334 CL |
4923 | netdev_dma_register(); |
4924 | ||
1da177e4 LT |
4925 | dev_boot_phase = 0; |
4926 | ||
962cf36c CM |
4927 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
4928 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); | |
1da177e4 LT |
4929 | |
4930 | hotcpu_notifier(dev_cpu_callback, 0); | |
4931 | dst_init(); | |
4932 | dev_mcast_init(); | |
4933 | rc = 0; | |
4934 | out: | |
4935 | return rc; | |
4936 | } | |
4937 | ||
4938 | subsys_initcall(net_dev_init); | |
4939 | ||
4940 | EXPORT_SYMBOL(__dev_get_by_index); | |
4941 | EXPORT_SYMBOL(__dev_get_by_name); | |
4942 | EXPORT_SYMBOL(__dev_remove_pack); | |
c2373ee9 | 4943 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
4944 | EXPORT_SYMBOL(dev_add_pack); |
4945 | EXPORT_SYMBOL(dev_alloc_name); | |
4946 | EXPORT_SYMBOL(dev_close); | |
4947 | EXPORT_SYMBOL(dev_get_by_flags); | |
4948 | EXPORT_SYMBOL(dev_get_by_index); | |
4949 | EXPORT_SYMBOL(dev_get_by_name); | |
1da177e4 LT |
4950 | EXPORT_SYMBOL(dev_open); |
4951 | EXPORT_SYMBOL(dev_queue_xmit); | |
4952 | EXPORT_SYMBOL(dev_remove_pack); | |
4953 | EXPORT_SYMBOL(dev_set_allmulti); | |
4954 | EXPORT_SYMBOL(dev_set_promiscuity); | |
4955 | EXPORT_SYMBOL(dev_change_flags); | |
4956 | EXPORT_SYMBOL(dev_set_mtu); | |
4957 | EXPORT_SYMBOL(dev_set_mac_address); | |
4958 | EXPORT_SYMBOL(free_netdev); | |
4959 | EXPORT_SYMBOL(netdev_boot_setup_check); | |
4960 | EXPORT_SYMBOL(netdev_set_master); | |
4961 | EXPORT_SYMBOL(netdev_state_change); | |
4962 | EXPORT_SYMBOL(netif_receive_skb); | |
4963 | EXPORT_SYMBOL(netif_rx); | |
4964 | EXPORT_SYMBOL(register_gifconf); | |
4965 | EXPORT_SYMBOL(register_netdevice); | |
4966 | EXPORT_SYMBOL(register_netdevice_notifier); | |
4967 | EXPORT_SYMBOL(skb_checksum_help); | |
4968 | EXPORT_SYMBOL(synchronize_net); | |
4969 | EXPORT_SYMBOL(unregister_netdevice); | |
4970 | EXPORT_SYMBOL(unregister_netdevice_notifier); | |
4971 | EXPORT_SYMBOL(net_enable_timestamp); | |
4972 | EXPORT_SYMBOL(net_disable_timestamp); | |
4973 | EXPORT_SYMBOL(dev_get_flags); | |
4974 | ||
4975 | #if defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE) | |
4976 | EXPORT_SYMBOL(br_handle_frame_hook); | |
4977 | EXPORT_SYMBOL(br_fdb_get_hook); | |
4978 | EXPORT_SYMBOL(br_fdb_put_hook); | |
4979 | #endif | |
4980 | ||
1da177e4 | 4981 | EXPORT_SYMBOL(dev_load); |
1da177e4 LT |
4982 | |
4983 | EXPORT_PER_CPU_SYMBOL(softnet_data); |