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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> | |
1da177e4 LT |
111 | #include <linux/netpoll.h> |
112 | #include <linux/rcupdate.h> | |
113 | #include <linux/delay.h> | |
295f4a1f | 114 | #include <net/wext.h> |
1da177e4 | 115 | #include <net/iw_handler.h> |
1da177e4 | 116 | #include <asm/current.h> |
5bdb9886 | 117 | #include <linux/audit.h> |
db217334 | 118 | #include <linux/dmaengine.h> |
f6a78bfc | 119 | #include <linux/err.h> |
c7fa9d18 | 120 | #include <linux/ctype.h> |
723e98b7 | 121 | #include <linux/if_arp.h> |
6de329e2 | 122 | #include <linux/if_vlan.h> |
8f0f2223 | 123 | #include <linux/ip.h> |
ad55dcaf | 124 | #include <net/ip.h> |
8f0f2223 DM |
125 | #include <linux/ipv6.h> |
126 | #include <linux/in.h> | |
b6b2fed1 DM |
127 | #include <linux/jhash.h> |
128 | #include <linux/random.h> | |
9cbc1cb8 | 129 | #include <trace/events/napi.h> |
1da177e4 | 130 | |
342709ef PE |
131 | #include "net-sysfs.h" |
132 | ||
d565b0a1 HX |
133 | /* Instead of increasing this, you should create a hash table. */ |
134 | #define MAX_GRO_SKBS 8 | |
135 | ||
5d38a079 HX |
136 | /* This should be increased if a protocol with a bigger head is added. */ |
137 | #define GRO_MAX_HEAD (MAX_HEADER + 128) | |
138 | ||
1da177e4 LT |
139 | /* |
140 | * The list of packet types we will receive (as opposed to discard) | |
141 | * and the routines to invoke. | |
142 | * | |
143 | * Why 16. Because with 16 the only overlap we get on a hash of the | |
144 | * low nibble of the protocol value is RARP/SNAP/X.25. | |
145 | * | |
146 | * NOTE: That is no longer true with the addition of VLAN tags. Not | |
147 | * sure which should go first, but I bet it won't make much | |
148 | * difference if we are running VLANs. The good news is that | |
149 | * this protocol won't be in the list unless compiled in, so | |
3041a069 | 150 | * the average user (w/out VLANs) will not be adversely affected. |
1da177e4 LT |
151 | * --BLG |
152 | * | |
153 | * 0800 IP | |
154 | * 8100 802.1Q VLAN | |
155 | * 0001 802.3 | |
156 | * 0002 AX.25 | |
157 | * 0004 802.2 | |
158 | * 8035 RARP | |
159 | * 0005 SNAP | |
160 | * 0805 X.25 | |
161 | * 0806 ARP | |
162 | * 8137 IPX | |
163 | * 0009 Localtalk | |
164 | * 86DD IPv6 | |
165 | */ | |
166 | ||
82d8a867 PE |
167 | #define PTYPE_HASH_SIZE (16) |
168 | #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) | |
169 | ||
1da177e4 | 170 | static DEFINE_SPINLOCK(ptype_lock); |
82d8a867 | 171 | static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
6b2bedc3 | 172 | static struct list_head ptype_all __read_mostly; /* Taps */ |
1da177e4 | 173 | |
1da177e4 | 174 | /* |
7562f876 | 175 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
176 | * semaphore. |
177 | * | |
178 | * Pure readers hold dev_base_lock for reading. | |
179 | * | |
180 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 181 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
182 | * actual updates. This allows pure readers to access the list even |
183 | * while a writer is preparing to update it. | |
184 | * | |
185 | * To put it another way, dev_base_lock is held for writing only to | |
186 | * protect against pure readers; the rtnl semaphore provides the | |
187 | * protection against other writers. | |
188 | * | |
189 | * See, for example usages, register_netdevice() and | |
190 | * unregister_netdevice(), which must be called with the rtnl | |
191 | * semaphore held. | |
192 | */ | |
1da177e4 | 193 | DEFINE_RWLOCK(dev_base_lock); |
1da177e4 LT |
194 | EXPORT_SYMBOL(dev_base_lock); |
195 | ||
881d966b | 196 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
1da177e4 LT |
197 | { |
198 | unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); | |
7c28bd0b | 199 | return &net->dev_name_head[hash & (NETDEV_HASHENTRIES - 1)]; |
1da177e4 LT |
200 | } |
201 | ||
881d966b | 202 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
1da177e4 | 203 | { |
7c28bd0b | 204 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
1da177e4 LT |
205 | } |
206 | ||
ce286d32 EB |
207 | /* Device list insertion */ |
208 | static int list_netdevice(struct net_device *dev) | |
209 | { | |
c346dca1 | 210 | struct net *net = dev_net(dev); |
ce286d32 EB |
211 | |
212 | ASSERT_RTNL(); | |
213 | ||
214 | write_lock_bh(&dev_base_lock); | |
215 | list_add_tail(&dev->dev_list, &net->dev_base_head); | |
216 | hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name)); | |
fb699dfd ED |
217 | hlist_add_head_rcu(&dev->index_hlist, |
218 | dev_index_hash(net, dev->ifindex)); | |
ce286d32 EB |
219 | write_unlock_bh(&dev_base_lock); |
220 | return 0; | |
221 | } | |
222 | ||
fb699dfd ED |
223 | /* Device list removal |
224 | * caller must respect a RCU grace period before freeing/reusing dev | |
225 | */ | |
ce286d32 EB |
226 | static void unlist_netdevice(struct net_device *dev) |
227 | { | |
228 | ASSERT_RTNL(); | |
229 | ||
230 | /* Unlink dev from the device chain */ | |
231 | write_lock_bh(&dev_base_lock); | |
232 | list_del(&dev->dev_list); | |
233 | hlist_del(&dev->name_hlist); | |
fb699dfd | 234 | hlist_del_rcu(&dev->index_hlist); |
ce286d32 EB |
235 | write_unlock_bh(&dev_base_lock); |
236 | } | |
237 | ||
1da177e4 LT |
238 | /* |
239 | * Our notifier list | |
240 | */ | |
241 | ||
f07d5b94 | 242 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
243 | |
244 | /* | |
245 | * Device drivers call our routines to queue packets here. We empty the | |
246 | * queue in the local softnet handler. | |
247 | */ | |
bea3348e SH |
248 | |
249 | DEFINE_PER_CPU(struct softnet_data, softnet_data); | |
d1b19dff | 250 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
1da177e4 | 251 | |
cf508b12 | 252 | #ifdef CONFIG_LOCKDEP |
723e98b7 | 253 | /* |
c773e847 | 254 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
723e98b7 JP |
255 | * according to dev->type |
256 | */ | |
257 | static const unsigned short netdev_lock_type[] = | |
258 | {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, | |
259 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, | |
260 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, | |
261 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, | |
262 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, | |
263 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, | |
264 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, | |
265 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, | |
266 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, | |
267 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, | |
268 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, | |
269 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, | |
270 | ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211, | |
2d91d78b | 271 | ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, |
929122cd | 272 | ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154, |
fcb94e42 | 273 | ARPHRD_VOID, ARPHRD_NONE}; |
723e98b7 | 274 | |
36cbd3dc | 275 | static const char *const netdev_lock_name[] = |
723e98b7 JP |
276 | {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", |
277 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", | |
278 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", | |
279 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", | |
280 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", | |
281 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", | |
282 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", | |
283 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", | |
284 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", | |
285 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", | |
286 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", | |
287 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", | |
288 | "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211", | |
2d91d78b | 289 | "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", |
929122cd | 290 | "_xmit_PHONET_PIPE", "_xmit_IEEE802154", |
fcb94e42 | 291 | "_xmit_VOID", "_xmit_NONE"}; |
723e98b7 JP |
292 | |
293 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; | |
cf508b12 | 294 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
723e98b7 JP |
295 | |
296 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) | |
297 | { | |
298 | int i; | |
299 | ||
300 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) | |
301 | if (netdev_lock_type[i] == dev_type) | |
302 | return i; | |
303 | /* the last key is used by default */ | |
304 | return ARRAY_SIZE(netdev_lock_type) - 1; | |
305 | } | |
306 | ||
cf508b12 DM |
307 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
308 | unsigned short dev_type) | |
723e98b7 JP |
309 | { |
310 | int i; | |
311 | ||
312 | i = netdev_lock_pos(dev_type); | |
313 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], | |
314 | netdev_lock_name[i]); | |
315 | } | |
cf508b12 DM |
316 | |
317 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
318 | { | |
319 | int i; | |
320 | ||
321 | i = netdev_lock_pos(dev->type); | |
322 | lockdep_set_class_and_name(&dev->addr_list_lock, | |
323 | &netdev_addr_lock_key[i], | |
324 | netdev_lock_name[i]); | |
325 | } | |
723e98b7 | 326 | #else |
cf508b12 DM |
327 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
328 | unsigned short dev_type) | |
329 | { | |
330 | } | |
331 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
723e98b7 JP |
332 | { |
333 | } | |
334 | #endif | |
1da177e4 LT |
335 | |
336 | /******************************************************************************* | |
337 | ||
338 | Protocol management and registration routines | |
339 | ||
340 | *******************************************************************************/ | |
341 | ||
1da177e4 LT |
342 | /* |
343 | * Add a protocol ID to the list. Now that the input handler is | |
344 | * smarter we can dispense with all the messy stuff that used to be | |
345 | * here. | |
346 | * | |
347 | * BEWARE!!! Protocol handlers, mangling input packets, | |
348 | * MUST BE last in hash buckets and checking protocol handlers | |
349 | * MUST start from promiscuous ptype_all chain in net_bh. | |
350 | * It is true now, do not change it. | |
351 | * Explanation follows: if protocol handler, mangling packet, will | |
352 | * be the first on list, it is not able to sense, that packet | |
353 | * is cloned and should be copied-on-write, so that it will | |
354 | * change it and subsequent readers will get broken packet. | |
355 | * --ANK (980803) | |
356 | */ | |
357 | ||
358 | /** | |
359 | * dev_add_pack - add packet handler | |
360 | * @pt: packet type declaration | |
361 | * | |
362 | * Add a protocol handler to the networking stack. The passed &packet_type | |
363 | * is linked into kernel lists and may not be freed until it has been | |
364 | * removed from the kernel lists. | |
365 | * | |
4ec93edb | 366 | * This call does not sleep therefore it can not |
1da177e4 LT |
367 | * guarantee all CPU's that are in middle of receiving packets |
368 | * will see the new packet type (until the next received packet). | |
369 | */ | |
370 | ||
371 | void dev_add_pack(struct packet_type *pt) | |
372 | { | |
373 | int hash; | |
374 | ||
375 | spin_lock_bh(&ptype_lock); | |
9be9a6b9 | 376 | if (pt->type == htons(ETH_P_ALL)) |
1da177e4 | 377 | list_add_rcu(&pt->list, &ptype_all); |
9be9a6b9 | 378 | else { |
82d8a867 | 379 | hash = ntohs(pt->type) & PTYPE_HASH_MASK; |
1da177e4 LT |
380 | list_add_rcu(&pt->list, &ptype_base[hash]); |
381 | } | |
382 | spin_unlock_bh(&ptype_lock); | |
383 | } | |
d1b19dff | 384 | EXPORT_SYMBOL(dev_add_pack); |
1da177e4 | 385 | |
1da177e4 LT |
386 | /** |
387 | * __dev_remove_pack - remove packet handler | |
388 | * @pt: packet type declaration | |
389 | * | |
390 | * Remove a protocol handler that was previously added to the kernel | |
391 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
392 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 393 | * returns. |
1da177e4 LT |
394 | * |
395 | * The packet type might still be in use by receivers | |
396 | * and must not be freed until after all the CPU's have gone | |
397 | * through a quiescent state. | |
398 | */ | |
399 | void __dev_remove_pack(struct packet_type *pt) | |
400 | { | |
401 | struct list_head *head; | |
402 | struct packet_type *pt1; | |
403 | ||
404 | spin_lock_bh(&ptype_lock); | |
405 | ||
9be9a6b9 | 406 | if (pt->type == htons(ETH_P_ALL)) |
1da177e4 | 407 | head = &ptype_all; |
9be9a6b9 | 408 | else |
82d8a867 | 409 | head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; |
1da177e4 LT |
410 | |
411 | list_for_each_entry(pt1, head, list) { | |
412 | if (pt == pt1) { | |
413 | list_del_rcu(&pt->list); | |
414 | goto out; | |
415 | } | |
416 | } | |
417 | ||
418 | printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt); | |
419 | out: | |
420 | spin_unlock_bh(&ptype_lock); | |
421 | } | |
d1b19dff ED |
422 | EXPORT_SYMBOL(__dev_remove_pack); |
423 | ||
1da177e4 LT |
424 | /** |
425 | * dev_remove_pack - remove packet handler | |
426 | * @pt: packet type declaration | |
427 | * | |
428 | * Remove a protocol handler that was previously added to the kernel | |
429 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
430 | * from the kernel lists and can be freed or reused once this function | |
431 | * returns. | |
432 | * | |
433 | * This call sleeps to guarantee that no CPU is looking at the packet | |
434 | * type after return. | |
435 | */ | |
436 | void dev_remove_pack(struct packet_type *pt) | |
437 | { | |
438 | __dev_remove_pack(pt); | |
4ec93edb | 439 | |
1da177e4 LT |
440 | synchronize_net(); |
441 | } | |
d1b19dff | 442 | EXPORT_SYMBOL(dev_remove_pack); |
1da177e4 LT |
443 | |
444 | /****************************************************************************** | |
445 | ||
446 | Device Boot-time Settings Routines | |
447 | ||
448 | *******************************************************************************/ | |
449 | ||
450 | /* Boot time configuration table */ | |
451 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
452 | ||
453 | /** | |
454 | * netdev_boot_setup_add - add new setup entry | |
455 | * @name: name of the device | |
456 | * @map: configured settings for the device | |
457 | * | |
458 | * Adds new setup entry to the dev_boot_setup list. The function | |
459 | * returns 0 on error and 1 on success. This is a generic routine to | |
460 | * all netdevices. | |
461 | */ | |
462 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
463 | { | |
464 | struct netdev_boot_setup *s; | |
465 | int i; | |
466 | ||
467 | s = dev_boot_setup; | |
468 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
469 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
470 | memset(s[i].name, 0, sizeof(s[i].name)); | |
93b3cff9 | 471 | strlcpy(s[i].name, name, IFNAMSIZ); |
1da177e4 LT |
472 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
473 | break; | |
474 | } | |
475 | } | |
476 | ||
477 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
478 | } | |
479 | ||
480 | /** | |
481 | * netdev_boot_setup_check - check boot time settings | |
482 | * @dev: the netdevice | |
483 | * | |
484 | * Check boot time settings for the device. | |
485 | * The found settings are set for the device to be used | |
486 | * later in the device probing. | |
487 | * Returns 0 if no settings found, 1 if they are. | |
488 | */ | |
489 | int netdev_boot_setup_check(struct net_device *dev) | |
490 | { | |
491 | struct netdev_boot_setup *s = dev_boot_setup; | |
492 | int i; | |
493 | ||
494 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
495 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
93b3cff9 | 496 | !strcmp(dev->name, s[i].name)) { |
1da177e4 LT |
497 | dev->irq = s[i].map.irq; |
498 | dev->base_addr = s[i].map.base_addr; | |
499 | dev->mem_start = s[i].map.mem_start; | |
500 | dev->mem_end = s[i].map.mem_end; | |
501 | return 1; | |
502 | } | |
503 | } | |
504 | return 0; | |
505 | } | |
d1b19dff | 506 | EXPORT_SYMBOL(netdev_boot_setup_check); |
1da177e4 LT |
507 | |
508 | ||
509 | /** | |
510 | * netdev_boot_base - get address from boot time settings | |
511 | * @prefix: prefix for network device | |
512 | * @unit: id for network device | |
513 | * | |
514 | * Check boot time settings for the base address of device. | |
515 | * The found settings are set for the device to be used | |
516 | * later in the device probing. | |
517 | * Returns 0 if no settings found. | |
518 | */ | |
519 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
520 | { | |
521 | const struct netdev_boot_setup *s = dev_boot_setup; | |
522 | char name[IFNAMSIZ]; | |
523 | int i; | |
524 | ||
525 | sprintf(name, "%s%d", prefix, unit); | |
526 | ||
527 | /* | |
528 | * If device already registered then return base of 1 | |
529 | * to indicate not to probe for this interface | |
530 | */ | |
881d966b | 531 | if (__dev_get_by_name(&init_net, name)) |
1da177e4 LT |
532 | return 1; |
533 | ||
534 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
535 | if (!strcmp(name, s[i].name)) | |
536 | return s[i].map.base_addr; | |
537 | return 0; | |
538 | } | |
539 | ||
540 | /* | |
541 | * Saves at boot time configured settings for any netdevice. | |
542 | */ | |
543 | int __init netdev_boot_setup(char *str) | |
544 | { | |
545 | int ints[5]; | |
546 | struct ifmap map; | |
547 | ||
548 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
549 | if (!str || !*str) | |
550 | return 0; | |
551 | ||
552 | /* Save settings */ | |
553 | memset(&map, 0, sizeof(map)); | |
554 | if (ints[0] > 0) | |
555 | map.irq = ints[1]; | |
556 | if (ints[0] > 1) | |
557 | map.base_addr = ints[2]; | |
558 | if (ints[0] > 2) | |
559 | map.mem_start = ints[3]; | |
560 | if (ints[0] > 3) | |
561 | map.mem_end = ints[4]; | |
562 | ||
563 | /* Add new entry to the list */ | |
564 | return netdev_boot_setup_add(str, &map); | |
565 | } | |
566 | ||
567 | __setup("netdev=", netdev_boot_setup); | |
568 | ||
569 | /******************************************************************************* | |
570 | ||
571 | Device Interface Subroutines | |
572 | ||
573 | *******************************************************************************/ | |
574 | ||
575 | /** | |
576 | * __dev_get_by_name - find a device by its name | |
c4ea43c5 | 577 | * @net: the applicable net namespace |
1da177e4 LT |
578 | * @name: name to find |
579 | * | |
580 | * Find an interface by name. Must be called under RTNL semaphore | |
581 | * or @dev_base_lock. If the name is found a pointer to the device | |
582 | * is returned. If the name is not found then %NULL is returned. The | |
583 | * reference counters are not incremented so the caller must be | |
584 | * careful with locks. | |
585 | */ | |
586 | ||
881d966b | 587 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
588 | { |
589 | struct hlist_node *p; | |
0bd8d536 ED |
590 | struct net_device *dev; |
591 | struct hlist_head *head = dev_name_hash(net, name); | |
1da177e4 | 592 | |
0bd8d536 | 593 | hlist_for_each_entry(dev, p, head, name_hlist) |
1da177e4 LT |
594 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
595 | return dev; | |
0bd8d536 | 596 | |
1da177e4 LT |
597 | return NULL; |
598 | } | |
d1b19dff | 599 | EXPORT_SYMBOL(__dev_get_by_name); |
1da177e4 LT |
600 | |
601 | /** | |
602 | * dev_get_by_name - find a device by its name | |
c4ea43c5 | 603 | * @net: the applicable net namespace |
1da177e4 LT |
604 | * @name: name to find |
605 | * | |
606 | * Find an interface by name. This can be called from any | |
607 | * context and does its own locking. The returned handle has | |
608 | * the usage count incremented and the caller must use dev_put() to | |
609 | * release it when it is no longer needed. %NULL is returned if no | |
610 | * matching device is found. | |
611 | */ | |
612 | ||
881d966b | 613 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
614 | { |
615 | struct net_device *dev; | |
616 | ||
617 | read_lock(&dev_base_lock); | |
881d966b | 618 | dev = __dev_get_by_name(net, name); |
1da177e4 LT |
619 | if (dev) |
620 | dev_hold(dev); | |
621 | read_unlock(&dev_base_lock); | |
622 | return dev; | |
623 | } | |
d1b19dff | 624 | EXPORT_SYMBOL(dev_get_by_name); |
1da177e4 LT |
625 | |
626 | /** | |
627 | * __dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 628 | * @net: the applicable net namespace |
1da177e4 LT |
629 | * @ifindex: index of device |
630 | * | |
631 | * Search for an interface by index. Returns %NULL if the device | |
632 | * is not found or a pointer to the device. The device has not | |
633 | * had its reference counter increased so the caller must be careful | |
634 | * about locking. The caller must hold either the RTNL semaphore | |
635 | * or @dev_base_lock. | |
636 | */ | |
637 | ||
881d966b | 638 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
639 | { |
640 | struct hlist_node *p; | |
0bd8d536 ED |
641 | struct net_device *dev; |
642 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
1da177e4 | 643 | |
0bd8d536 | 644 | hlist_for_each_entry(dev, p, head, index_hlist) |
1da177e4 LT |
645 | if (dev->ifindex == ifindex) |
646 | return dev; | |
0bd8d536 | 647 | |
1da177e4 LT |
648 | return NULL; |
649 | } | |
d1b19dff | 650 | EXPORT_SYMBOL(__dev_get_by_index); |
1da177e4 | 651 | |
fb699dfd ED |
652 | /** |
653 | * dev_get_by_index_rcu - find a device by its ifindex | |
654 | * @net: the applicable net namespace | |
655 | * @ifindex: index of device | |
656 | * | |
657 | * Search for an interface by index. Returns %NULL if the device | |
658 | * is not found or a pointer to the device. The device has not | |
659 | * had its reference counter increased so the caller must be careful | |
660 | * about locking. The caller must hold RCU lock. | |
661 | */ | |
662 | ||
663 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) | |
664 | { | |
665 | struct hlist_node *p; | |
666 | struct net_device *dev; | |
667 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
668 | ||
669 | hlist_for_each_entry_rcu(dev, p, head, index_hlist) | |
670 | if (dev->ifindex == ifindex) | |
671 | return dev; | |
672 | ||
673 | return NULL; | |
674 | } | |
675 | EXPORT_SYMBOL(dev_get_by_index_rcu); | |
676 | ||
1da177e4 LT |
677 | |
678 | /** | |
679 | * dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 680 | * @net: the applicable net namespace |
1da177e4 LT |
681 | * @ifindex: index of device |
682 | * | |
683 | * Search for an interface by index. Returns NULL if the device | |
684 | * is not found or a pointer to the device. The device returned has | |
685 | * had a reference added and the pointer is safe until the user calls | |
686 | * dev_put to indicate they have finished with it. | |
687 | */ | |
688 | ||
881d966b | 689 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
690 | { |
691 | struct net_device *dev; | |
692 | ||
fb699dfd ED |
693 | rcu_read_lock(); |
694 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 LT |
695 | if (dev) |
696 | dev_hold(dev); | |
fb699dfd | 697 | rcu_read_unlock(); |
1da177e4 LT |
698 | return dev; |
699 | } | |
d1b19dff | 700 | EXPORT_SYMBOL(dev_get_by_index); |
1da177e4 LT |
701 | |
702 | /** | |
703 | * dev_getbyhwaddr - find a device by its hardware address | |
c4ea43c5 | 704 | * @net: the applicable net namespace |
1da177e4 LT |
705 | * @type: media type of device |
706 | * @ha: hardware address | |
707 | * | |
708 | * Search for an interface by MAC address. Returns NULL if the device | |
709 | * is not found or a pointer to the device. The caller must hold the | |
710 | * rtnl semaphore. The returned device has not had its ref count increased | |
711 | * and the caller must therefore be careful about locking | |
712 | * | |
713 | * BUGS: | |
714 | * If the API was consistent this would be __dev_get_by_hwaddr | |
715 | */ | |
716 | ||
881d966b | 717 | struct net_device *dev_getbyhwaddr(struct net *net, unsigned short type, char *ha) |
1da177e4 LT |
718 | { |
719 | struct net_device *dev; | |
720 | ||
721 | ASSERT_RTNL(); | |
722 | ||
81103a52 | 723 | for_each_netdev(net, dev) |
1da177e4 LT |
724 | if (dev->type == type && |
725 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
726 | return dev; |
727 | ||
728 | return NULL; | |
1da177e4 | 729 | } |
cf309e3f JF |
730 | EXPORT_SYMBOL(dev_getbyhwaddr); |
731 | ||
881d966b | 732 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
1da177e4 LT |
733 | { |
734 | struct net_device *dev; | |
735 | ||
4e9cac2b | 736 | ASSERT_RTNL(); |
881d966b | 737 | for_each_netdev(net, dev) |
4e9cac2b | 738 | if (dev->type == type) |
7562f876 PE |
739 | return dev; |
740 | ||
741 | return NULL; | |
4e9cac2b | 742 | } |
4e9cac2b PM |
743 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
744 | ||
881d966b | 745 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
4e9cac2b PM |
746 | { |
747 | struct net_device *dev; | |
748 | ||
749 | rtnl_lock(); | |
881d966b | 750 | dev = __dev_getfirstbyhwtype(net, type); |
4e9cac2b PM |
751 | if (dev) |
752 | dev_hold(dev); | |
1da177e4 LT |
753 | rtnl_unlock(); |
754 | return dev; | |
755 | } | |
1da177e4 LT |
756 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
757 | ||
758 | /** | |
759 | * dev_get_by_flags - find any device with given flags | |
c4ea43c5 | 760 | * @net: the applicable net namespace |
1da177e4 LT |
761 | * @if_flags: IFF_* values |
762 | * @mask: bitmask of bits in if_flags to check | |
763 | * | |
764 | * Search for any interface with the given flags. Returns NULL if a device | |
4ec93edb | 765 | * is not found or a pointer to the device. The device returned has |
1da177e4 LT |
766 | * had a reference added and the pointer is safe until the user calls |
767 | * dev_put to indicate they have finished with it. | |
768 | */ | |
769 | ||
d1b19dff ED |
770 | struct net_device *dev_get_by_flags(struct net *net, unsigned short if_flags, |
771 | unsigned short mask) | |
1da177e4 | 772 | { |
7562f876 | 773 | struct net_device *dev, *ret; |
1da177e4 | 774 | |
7562f876 | 775 | ret = NULL; |
1da177e4 | 776 | read_lock(&dev_base_lock); |
881d966b | 777 | for_each_netdev(net, dev) { |
1da177e4 LT |
778 | if (((dev->flags ^ if_flags) & mask) == 0) { |
779 | dev_hold(dev); | |
7562f876 | 780 | ret = dev; |
1da177e4 LT |
781 | break; |
782 | } | |
783 | } | |
784 | read_unlock(&dev_base_lock); | |
7562f876 | 785 | return ret; |
1da177e4 | 786 | } |
d1b19dff | 787 | EXPORT_SYMBOL(dev_get_by_flags); |
1da177e4 LT |
788 | |
789 | /** | |
790 | * dev_valid_name - check if name is okay for network device | |
791 | * @name: name string | |
792 | * | |
793 | * Network device names need to be valid file names to | |
c7fa9d18 DM |
794 | * to allow sysfs to work. We also disallow any kind of |
795 | * whitespace. | |
1da177e4 | 796 | */ |
c2373ee9 | 797 | int dev_valid_name(const char *name) |
1da177e4 | 798 | { |
c7fa9d18 DM |
799 | if (*name == '\0') |
800 | return 0; | |
b6fe17d6 SH |
801 | if (strlen(name) >= IFNAMSIZ) |
802 | return 0; | |
c7fa9d18 DM |
803 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
804 | return 0; | |
805 | ||
806 | while (*name) { | |
807 | if (*name == '/' || isspace(*name)) | |
808 | return 0; | |
809 | name++; | |
810 | } | |
811 | return 1; | |
1da177e4 | 812 | } |
d1b19dff | 813 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
814 | |
815 | /** | |
b267b179 EB |
816 | * __dev_alloc_name - allocate a name for a device |
817 | * @net: network namespace to allocate the device name in | |
1da177e4 | 818 | * @name: name format string |
b267b179 | 819 | * @buf: scratch buffer and result name string |
1da177e4 LT |
820 | * |
821 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
822 | * id. It scans list of devices to build up a free map, then chooses |
823 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
824 | * while allocating the name and adding the device in order to avoid | |
825 | * duplicates. | |
826 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
827 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
828 | */ |
829 | ||
b267b179 | 830 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
1da177e4 LT |
831 | { |
832 | int i = 0; | |
1da177e4 LT |
833 | const char *p; |
834 | const int max_netdevices = 8*PAGE_SIZE; | |
cfcabdcc | 835 | unsigned long *inuse; |
1da177e4 LT |
836 | struct net_device *d; |
837 | ||
838 | p = strnchr(name, IFNAMSIZ-1, '%'); | |
839 | if (p) { | |
840 | /* | |
841 | * Verify the string as this thing may have come from | |
842 | * the user. There must be either one "%d" and no other "%" | |
843 | * characters. | |
844 | */ | |
845 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
846 | return -EINVAL; | |
847 | ||
848 | /* Use one page as a bit array of possible slots */ | |
cfcabdcc | 849 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
850 | if (!inuse) |
851 | return -ENOMEM; | |
852 | ||
881d966b | 853 | for_each_netdev(net, d) { |
1da177e4 LT |
854 | if (!sscanf(d->name, name, &i)) |
855 | continue; | |
856 | if (i < 0 || i >= max_netdevices) | |
857 | continue; | |
858 | ||
859 | /* avoid cases where sscanf is not exact inverse of printf */ | |
b267b179 | 860 | snprintf(buf, IFNAMSIZ, name, i); |
1da177e4 LT |
861 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
862 | set_bit(i, inuse); | |
863 | } | |
864 | ||
865 | i = find_first_zero_bit(inuse, max_netdevices); | |
866 | free_page((unsigned long) inuse); | |
867 | } | |
868 | ||
b267b179 EB |
869 | snprintf(buf, IFNAMSIZ, name, i); |
870 | if (!__dev_get_by_name(net, buf)) | |
1da177e4 | 871 | return i; |
1da177e4 LT |
872 | |
873 | /* It is possible to run out of possible slots | |
874 | * when the name is long and there isn't enough space left | |
875 | * for the digits, or if all bits are used. | |
876 | */ | |
877 | return -ENFILE; | |
878 | } | |
879 | ||
b267b179 EB |
880 | /** |
881 | * dev_alloc_name - allocate a name for a device | |
882 | * @dev: device | |
883 | * @name: name format string | |
884 | * | |
885 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
886 | * id. It scans list of devices to build up a free map, then chooses | |
887 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
888 | * while allocating the name and adding the device in order to avoid | |
889 | * duplicates. | |
890 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
891 | * Returns the number of the unit assigned or a negative errno code. | |
892 | */ | |
893 | ||
894 | int dev_alloc_name(struct net_device *dev, const char *name) | |
895 | { | |
896 | char buf[IFNAMSIZ]; | |
897 | struct net *net; | |
898 | int ret; | |
899 | ||
c346dca1 YH |
900 | BUG_ON(!dev_net(dev)); |
901 | net = dev_net(dev); | |
b267b179 EB |
902 | ret = __dev_alloc_name(net, name, buf); |
903 | if (ret >= 0) | |
904 | strlcpy(dev->name, buf, IFNAMSIZ); | |
905 | return ret; | |
906 | } | |
d1b19dff | 907 | EXPORT_SYMBOL(dev_alloc_name); |
b267b179 | 908 | |
1da177e4 LT |
909 | |
910 | /** | |
911 | * dev_change_name - change name of a device | |
912 | * @dev: device | |
913 | * @newname: name (or format string) must be at least IFNAMSIZ | |
914 | * | |
915 | * Change name of a device, can pass format strings "eth%d". | |
916 | * for wildcarding. | |
917 | */ | |
cf04a4c7 | 918 | int dev_change_name(struct net_device *dev, const char *newname) |
1da177e4 | 919 | { |
fcc5a03a | 920 | char oldname[IFNAMSIZ]; |
1da177e4 | 921 | int err = 0; |
fcc5a03a | 922 | int ret; |
881d966b | 923 | struct net *net; |
1da177e4 LT |
924 | |
925 | ASSERT_RTNL(); | |
c346dca1 | 926 | BUG_ON(!dev_net(dev)); |
1da177e4 | 927 | |
c346dca1 | 928 | net = dev_net(dev); |
1da177e4 LT |
929 | if (dev->flags & IFF_UP) |
930 | return -EBUSY; | |
931 | ||
932 | if (!dev_valid_name(newname)) | |
933 | return -EINVAL; | |
934 | ||
c8d90dca SH |
935 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) |
936 | return 0; | |
937 | ||
fcc5a03a HX |
938 | memcpy(oldname, dev->name, IFNAMSIZ); |
939 | ||
1da177e4 LT |
940 | if (strchr(newname, '%')) { |
941 | err = dev_alloc_name(dev, newname); | |
942 | if (err < 0) | |
943 | return err; | |
d1b19dff | 944 | } else if (__dev_get_by_name(net, newname)) |
1da177e4 LT |
945 | return -EEXIST; |
946 | else | |
947 | strlcpy(dev->name, newname, IFNAMSIZ); | |
948 | ||
fcc5a03a | 949 | rollback: |
3891845e EB |
950 | /* For now only devices in the initial network namespace |
951 | * are in sysfs. | |
952 | */ | |
953 | if (net == &init_net) { | |
954 | ret = device_rename(&dev->dev, dev->name); | |
955 | if (ret) { | |
956 | memcpy(dev->name, oldname, IFNAMSIZ); | |
957 | return ret; | |
958 | } | |
dcc99773 | 959 | } |
7f988eab HX |
960 | |
961 | write_lock_bh(&dev_base_lock); | |
92749821 | 962 | hlist_del(&dev->name_hlist); |
881d966b | 963 | hlist_add_head(&dev->name_hlist, dev_name_hash(net, dev->name)); |
7f988eab HX |
964 | write_unlock_bh(&dev_base_lock); |
965 | ||
056925ab | 966 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
fcc5a03a HX |
967 | ret = notifier_to_errno(ret); |
968 | ||
969 | if (ret) { | |
970 | if (err) { | |
971 | printk(KERN_ERR | |
972 | "%s: name change rollback failed: %d.\n", | |
973 | dev->name, ret); | |
974 | } else { | |
975 | err = ret; | |
976 | memcpy(dev->name, oldname, IFNAMSIZ); | |
977 | goto rollback; | |
978 | } | |
979 | } | |
1da177e4 LT |
980 | |
981 | return err; | |
982 | } | |
983 | ||
0b815a1a SH |
984 | /** |
985 | * dev_set_alias - change ifalias of a device | |
986 | * @dev: device | |
987 | * @alias: name up to IFALIASZ | |
f0db275a | 988 | * @len: limit of bytes to copy from info |
0b815a1a SH |
989 | * |
990 | * Set ifalias for a device, | |
991 | */ | |
992 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) | |
993 | { | |
994 | ASSERT_RTNL(); | |
995 | ||
996 | if (len >= IFALIASZ) | |
997 | return -EINVAL; | |
998 | ||
96ca4a2c OH |
999 | if (!len) { |
1000 | if (dev->ifalias) { | |
1001 | kfree(dev->ifalias); | |
1002 | dev->ifalias = NULL; | |
1003 | } | |
1004 | return 0; | |
1005 | } | |
1006 | ||
d1b19dff | 1007 | dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); |
0b815a1a SH |
1008 | if (!dev->ifalias) |
1009 | return -ENOMEM; | |
1010 | ||
1011 | strlcpy(dev->ifalias, alias, len+1); | |
1012 | return len; | |
1013 | } | |
1014 | ||
1015 | ||
d8a33ac4 | 1016 | /** |
3041a069 | 1017 | * netdev_features_change - device changes features |
d8a33ac4 SH |
1018 | * @dev: device to cause notification |
1019 | * | |
1020 | * Called to indicate a device has changed features. | |
1021 | */ | |
1022 | void netdev_features_change(struct net_device *dev) | |
1023 | { | |
056925ab | 1024 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
1025 | } |
1026 | EXPORT_SYMBOL(netdev_features_change); | |
1027 | ||
1da177e4 LT |
1028 | /** |
1029 | * netdev_state_change - device changes state | |
1030 | * @dev: device to cause notification | |
1031 | * | |
1032 | * Called to indicate a device has changed state. This function calls | |
1033 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
1034 | * to the routing socket. | |
1035 | */ | |
1036 | void netdev_state_change(struct net_device *dev) | |
1037 | { | |
1038 | if (dev->flags & IFF_UP) { | |
056925ab | 1039 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
1da177e4 LT |
1040 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); |
1041 | } | |
1042 | } | |
d1b19dff | 1043 | EXPORT_SYMBOL(netdev_state_change); |
1da177e4 | 1044 | |
75c78500 | 1045 | void netdev_bonding_change(struct net_device *dev, unsigned long event) |
c1da4ac7 | 1046 | { |
75c78500 | 1047 | call_netdevice_notifiers(event, dev); |
c1da4ac7 OG |
1048 | } |
1049 | EXPORT_SYMBOL(netdev_bonding_change); | |
1050 | ||
1da177e4 LT |
1051 | /** |
1052 | * dev_load - load a network module | |
c4ea43c5 | 1053 | * @net: the applicable net namespace |
1da177e4 LT |
1054 | * @name: name of interface |
1055 | * | |
1056 | * If a network interface is not present and the process has suitable | |
1057 | * privileges this function loads the module. If module loading is not | |
1058 | * available in this kernel then it becomes a nop. | |
1059 | */ | |
1060 | ||
881d966b | 1061 | void dev_load(struct net *net, const char *name) |
1da177e4 | 1062 | { |
4ec93edb | 1063 | struct net_device *dev; |
1da177e4 LT |
1064 | |
1065 | read_lock(&dev_base_lock); | |
881d966b | 1066 | dev = __dev_get_by_name(net, name); |
1da177e4 LT |
1067 | read_unlock(&dev_base_lock); |
1068 | ||
a8f80e8f | 1069 | if (!dev && capable(CAP_NET_ADMIN)) |
1da177e4 LT |
1070 | request_module("%s", name); |
1071 | } | |
d1b19dff | 1072 | EXPORT_SYMBOL(dev_load); |
1da177e4 | 1073 | |
1da177e4 LT |
1074 | /** |
1075 | * dev_open - prepare an interface for use. | |
1076 | * @dev: device to open | |
1077 | * | |
1078 | * Takes a device from down to up state. The device's private open | |
1079 | * function is invoked and then the multicast lists are loaded. Finally | |
1080 | * the device is moved into the up state and a %NETDEV_UP message is | |
1081 | * sent to the netdev notifier chain. | |
1082 | * | |
1083 | * Calling this function on an active interface is a nop. On a failure | |
1084 | * a negative errno code is returned. | |
1085 | */ | |
1086 | int dev_open(struct net_device *dev) | |
1087 | { | |
d314774c | 1088 | const struct net_device_ops *ops = dev->netdev_ops; |
3b8bcfd5 | 1089 | int ret; |
1da177e4 | 1090 | |
e46b66bc BH |
1091 | ASSERT_RTNL(); |
1092 | ||
1da177e4 LT |
1093 | /* |
1094 | * Is it already up? | |
1095 | */ | |
1096 | ||
1097 | if (dev->flags & IFF_UP) | |
1098 | return 0; | |
1099 | ||
1100 | /* | |
1101 | * Is it even present? | |
1102 | */ | |
1103 | if (!netif_device_present(dev)) | |
1104 | return -ENODEV; | |
1105 | ||
3b8bcfd5 JB |
1106 | ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev); |
1107 | ret = notifier_to_errno(ret); | |
1108 | if (ret) | |
1109 | return ret; | |
1110 | ||
1da177e4 LT |
1111 | /* |
1112 | * Call device private open method | |
1113 | */ | |
1114 | set_bit(__LINK_STATE_START, &dev->state); | |
bada339b | 1115 | |
d314774c SH |
1116 | if (ops->ndo_validate_addr) |
1117 | ret = ops->ndo_validate_addr(dev); | |
bada339b | 1118 | |
d314774c SH |
1119 | if (!ret && ops->ndo_open) |
1120 | ret = ops->ndo_open(dev); | |
1da177e4 | 1121 | |
4ec93edb | 1122 | /* |
1da177e4 LT |
1123 | * If it went open OK then: |
1124 | */ | |
1125 | ||
bada339b JG |
1126 | if (ret) |
1127 | clear_bit(__LINK_STATE_START, &dev->state); | |
1128 | else { | |
1da177e4 LT |
1129 | /* |
1130 | * Set the flags. | |
1131 | */ | |
1132 | dev->flags |= IFF_UP; | |
1133 | ||
649274d9 DW |
1134 | /* |
1135 | * Enable NET_DMA | |
1136 | */ | |
b4bd07c2 | 1137 | net_dmaengine_get(); |
649274d9 | 1138 | |
1da177e4 LT |
1139 | /* |
1140 | * Initialize multicasting status | |
1141 | */ | |
4417da66 | 1142 | dev_set_rx_mode(dev); |
1da177e4 LT |
1143 | |
1144 | /* | |
1145 | * Wakeup transmit queue engine | |
1146 | */ | |
1147 | dev_activate(dev); | |
1148 | ||
1149 | /* | |
1150 | * ... and announce new interface. | |
1151 | */ | |
056925ab | 1152 | call_netdevice_notifiers(NETDEV_UP, dev); |
1da177e4 | 1153 | } |
bada339b | 1154 | |
1da177e4 LT |
1155 | return ret; |
1156 | } | |
d1b19dff | 1157 | EXPORT_SYMBOL(dev_open); |
1da177e4 LT |
1158 | |
1159 | /** | |
1160 | * dev_close - shutdown an interface. | |
1161 | * @dev: device to shutdown | |
1162 | * | |
1163 | * This function moves an active device into down state. A | |
1164 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1165 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1166 | * chain. | |
1167 | */ | |
1168 | int dev_close(struct net_device *dev) | |
1169 | { | |
d314774c | 1170 | const struct net_device_ops *ops = dev->netdev_ops; |
e46b66bc BH |
1171 | ASSERT_RTNL(); |
1172 | ||
9d5010db DM |
1173 | might_sleep(); |
1174 | ||
1da177e4 LT |
1175 | if (!(dev->flags & IFF_UP)) |
1176 | return 0; | |
1177 | ||
1178 | /* | |
1179 | * Tell people we are going down, so that they can | |
1180 | * prepare to death, when device is still operating. | |
1181 | */ | |
056925ab | 1182 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); |
1da177e4 | 1183 | |
1da177e4 LT |
1184 | clear_bit(__LINK_STATE_START, &dev->state); |
1185 | ||
1186 | /* Synchronize to scheduled poll. We cannot touch poll list, | |
bea3348e SH |
1187 | * it can be even on different cpu. So just clear netif_running(). |
1188 | * | |
1189 | * dev->stop() will invoke napi_disable() on all of it's | |
1190 | * napi_struct instances on this device. | |
1191 | */ | |
1da177e4 | 1192 | smp_mb__after_clear_bit(); /* Commit netif_running(). */ |
1da177e4 | 1193 | |
d8b2a4d2 ML |
1194 | dev_deactivate(dev); |
1195 | ||
1da177e4 LT |
1196 | /* |
1197 | * Call the device specific close. This cannot fail. | |
1198 | * Only if device is UP | |
1199 | * | |
1200 | * We allow it to be called even after a DETACH hot-plug | |
1201 | * event. | |
1202 | */ | |
d314774c SH |
1203 | if (ops->ndo_stop) |
1204 | ops->ndo_stop(dev); | |
1da177e4 LT |
1205 | |
1206 | /* | |
1207 | * Device is now down. | |
1208 | */ | |
1209 | ||
1210 | dev->flags &= ~IFF_UP; | |
1211 | ||
1212 | /* | |
1213 | * Tell people we are down | |
1214 | */ | |
056925ab | 1215 | call_netdevice_notifiers(NETDEV_DOWN, dev); |
1da177e4 | 1216 | |
649274d9 DW |
1217 | /* |
1218 | * Shutdown NET_DMA | |
1219 | */ | |
b4bd07c2 | 1220 | net_dmaengine_put(); |
649274d9 | 1221 | |
1da177e4 LT |
1222 | return 0; |
1223 | } | |
d1b19dff | 1224 | EXPORT_SYMBOL(dev_close); |
1da177e4 LT |
1225 | |
1226 | ||
0187bdfb BH |
1227 | /** |
1228 | * dev_disable_lro - disable Large Receive Offload on a device | |
1229 | * @dev: device | |
1230 | * | |
1231 | * Disable Large Receive Offload (LRO) on a net device. Must be | |
1232 | * called under RTNL. This is needed if received packets may be | |
1233 | * forwarded to another interface. | |
1234 | */ | |
1235 | void dev_disable_lro(struct net_device *dev) | |
1236 | { | |
1237 | if (dev->ethtool_ops && dev->ethtool_ops->get_flags && | |
1238 | dev->ethtool_ops->set_flags) { | |
1239 | u32 flags = dev->ethtool_ops->get_flags(dev); | |
1240 | if (flags & ETH_FLAG_LRO) { | |
1241 | flags &= ~ETH_FLAG_LRO; | |
1242 | dev->ethtool_ops->set_flags(dev, flags); | |
1243 | } | |
1244 | } | |
1245 | WARN_ON(dev->features & NETIF_F_LRO); | |
1246 | } | |
1247 | EXPORT_SYMBOL(dev_disable_lro); | |
1248 | ||
1249 | ||
881d966b EB |
1250 | static int dev_boot_phase = 1; |
1251 | ||
1da177e4 LT |
1252 | /* |
1253 | * Device change register/unregister. These are not inline or static | |
1254 | * as we export them to the world. | |
1255 | */ | |
1256 | ||
1257 | /** | |
1258 | * register_netdevice_notifier - register a network notifier block | |
1259 | * @nb: notifier | |
1260 | * | |
1261 | * Register a notifier to be called when network device events occur. | |
1262 | * The notifier passed is linked into the kernel structures and must | |
1263 | * not be reused until it has been unregistered. A negative errno code | |
1264 | * is returned on a failure. | |
1265 | * | |
1266 | * When registered all registration and up events are replayed | |
4ec93edb | 1267 | * to the new notifier to allow device to have a race free |
1da177e4 LT |
1268 | * view of the network device list. |
1269 | */ | |
1270 | ||
1271 | int register_netdevice_notifier(struct notifier_block *nb) | |
1272 | { | |
1273 | struct net_device *dev; | |
fcc5a03a | 1274 | struct net_device *last; |
881d966b | 1275 | struct net *net; |
1da177e4 LT |
1276 | int err; |
1277 | ||
1278 | rtnl_lock(); | |
f07d5b94 | 1279 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1280 | if (err) |
1281 | goto unlock; | |
881d966b EB |
1282 | if (dev_boot_phase) |
1283 | goto unlock; | |
1284 | for_each_net(net) { | |
1285 | for_each_netdev(net, dev) { | |
1286 | err = nb->notifier_call(nb, NETDEV_REGISTER, dev); | |
1287 | err = notifier_to_errno(err); | |
1288 | if (err) | |
1289 | goto rollback; | |
1290 | ||
1291 | if (!(dev->flags & IFF_UP)) | |
1292 | continue; | |
1da177e4 | 1293 | |
881d966b EB |
1294 | nb->notifier_call(nb, NETDEV_UP, dev); |
1295 | } | |
1da177e4 | 1296 | } |
fcc5a03a HX |
1297 | |
1298 | unlock: | |
1da177e4 LT |
1299 | rtnl_unlock(); |
1300 | return err; | |
fcc5a03a HX |
1301 | |
1302 | rollback: | |
1303 | last = dev; | |
881d966b EB |
1304 | for_each_net(net) { |
1305 | for_each_netdev(net, dev) { | |
1306 | if (dev == last) | |
1307 | break; | |
fcc5a03a | 1308 | |
881d966b EB |
1309 | if (dev->flags & IFF_UP) { |
1310 | nb->notifier_call(nb, NETDEV_GOING_DOWN, dev); | |
1311 | nb->notifier_call(nb, NETDEV_DOWN, dev); | |
1312 | } | |
1313 | nb->notifier_call(nb, NETDEV_UNREGISTER, dev); | |
fcc5a03a | 1314 | } |
fcc5a03a | 1315 | } |
c67625a1 PE |
1316 | |
1317 | raw_notifier_chain_unregister(&netdev_chain, nb); | |
fcc5a03a | 1318 | goto unlock; |
1da177e4 | 1319 | } |
d1b19dff | 1320 | EXPORT_SYMBOL(register_netdevice_notifier); |
1da177e4 LT |
1321 | |
1322 | /** | |
1323 | * unregister_netdevice_notifier - unregister a network notifier block | |
1324 | * @nb: notifier | |
1325 | * | |
1326 | * Unregister a notifier previously registered by | |
1327 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1328 | * kernel structures and may then be reused. A negative errno code | |
1329 | * is returned on a failure. | |
1330 | */ | |
1331 | ||
1332 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1333 | { | |
9f514950 HX |
1334 | int err; |
1335 | ||
1336 | rtnl_lock(); | |
f07d5b94 | 1337 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
9f514950 HX |
1338 | rtnl_unlock(); |
1339 | return err; | |
1da177e4 | 1340 | } |
d1b19dff | 1341 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
1da177e4 LT |
1342 | |
1343 | /** | |
1344 | * call_netdevice_notifiers - call all network notifier blocks | |
1345 | * @val: value passed unmodified to notifier function | |
c4ea43c5 | 1346 | * @dev: net_device pointer passed unmodified to notifier function |
1da177e4 LT |
1347 | * |
1348 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 1349 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
1350 | */ |
1351 | ||
ad7379d4 | 1352 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
1da177e4 | 1353 | { |
ad7379d4 | 1354 | return raw_notifier_call_chain(&netdev_chain, val, dev); |
1da177e4 LT |
1355 | } |
1356 | ||
1357 | /* When > 0 there are consumers of rx skb time stamps */ | |
1358 | static atomic_t netstamp_needed = ATOMIC_INIT(0); | |
1359 | ||
1360 | void net_enable_timestamp(void) | |
1361 | { | |
1362 | atomic_inc(&netstamp_needed); | |
1363 | } | |
d1b19dff | 1364 | EXPORT_SYMBOL(net_enable_timestamp); |
1da177e4 LT |
1365 | |
1366 | void net_disable_timestamp(void) | |
1367 | { | |
1368 | atomic_dec(&netstamp_needed); | |
1369 | } | |
d1b19dff | 1370 | EXPORT_SYMBOL(net_disable_timestamp); |
1da177e4 | 1371 | |
a61bbcf2 | 1372 | static inline void net_timestamp(struct sk_buff *skb) |
1da177e4 LT |
1373 | { |
1374 | if (atomic_read(&netstamp_needed)) | |
a61bbcf2 | 1375 | __net_timestamp(skb); |
b7aa0bf7 ED |
1376 | else |
1377 | skb->tstamp.tv64 = 0; | |
1da177e4 LT |
1378 | } |
1379 | ||
1380 | /* | |
1381 | * Support routine. Sends outgoing frames to any network | |
1382 | * taps currently in use. | |
1383 | */ | |
1384 | ||
f6a78bfc | 1385 | static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
1386 | { |
1387 | struct packet_type *ptype; | |
a61bbcf2 | 1388 | |
8caf1539 JP |
1389 | #ifdef CONFIG_NET_CLS_ACT |
1390 | if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS))) | |
1391 | net_timestamp(skb); | |
1392 | #else | |
a61bbcf2 | 1393 | net_timestamp(skb); |
8caf1539 | 1394 | #endif |
1da177e4 LT |
1395 | |
1396 | rcu_read_lock(); | |
1397 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
1398 | /* Never send packets back to the socket | |
1399 | * they originated from - MvS (miquels@drinkel.ow.org) | |
1400 | */ | |
1401 | if ((ptype->dev == dev || !ptype->dev) && | |
1402 | (ptype->af_packet_priv == NULL || | |
1403 | (struct sock *)ptype->af_packet_priv != skb->sk)) { | |
d1b19dff | 1404 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
1da177e4 LT |
1405 | if (!skb2) |
1406 | break; | |
1407 | ||
1408 | /* skb->nh should be correctly | |
1409 | set by sender, so that the second statement is | |
1410 | just protection against buggy protocols. | |
1411 | */ | |
459a98ed | 1412 | skb_reset_mac_header(skb2); |
1da177e4 | 1413 | |
d56f90a7 | 1414 | if (skb_network_header(skb2) < skb2->data || |
27a884dc | 1415 | skb2->network_header > skb2->tail) { |
1da177e4 LT |
1416 | if (net_ratelimit()) |
1417 | printk(KERN_CRIT "protocol %04x is " | |
1418 | "buggy, dev %s\n", | |
1419 | skb2->protocol, dev->name); | |
c1d2bbe1 | 1420 | skb_reset_network_header(skb2); |
1da177e4 LT |
1421 | } |
1422 | ||
b0e380b1 | 1423 | skb2->transport_header = skb2->network_header; |
1da177e4 | 1424 | skb2->pkt_type = PACKET_OUTGOING; |
f2ccd8fa | 1425 | ptype->func(skb2, skb->dev, ptype, skb->dev); |
1da177e4 LT |
1426 | } |
1427 | } | |
1428 | rcu_read_unlock(); | |
1429 | } | |
1430 | ||
56079431 | 1431 | |
def82a1d | 1432 | static inline void __netif_reschedule(struct Qdisc *q) |
56079431 | 1433 | { |
def82a1d JP |
1434 | struct softnet_data *sd; |
1435 | unsigned long flags; | |
56079431 | 1436 | |
def82a1d JP |
1437 | local_irq_save(flags); |
1438 | sd = &__get_cpu_var(softnet_data); | |
1439 | q->next_sched = sd->output_queue; | |
1440 | sd->output_queue = q; | |
1441 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
1442 | local_irq_restore(flags); | |
1443 | } | |
1444 | ||
1445 | void __netif_schedule(struct Qdisc *q) | |
1446 | { | |
1447 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) | |
1448 | __netif_reschedule(q); | |
56079431 DV |
1449 | } |
1450 | EXPORT_SYMBOL(__netif_schedule); | |
1451 | ||
bea3348e | 1452 | void dev_kfree_skb_irq(struct sk_buff *skb) |
56079431 | 1453 | { |
bea3348e SH |
1454 | if (atomic_dec_and_test(&skb->users)) { |
1455 | struct softnet_data *sd; | |
1456 | unsigned long flags; | |
56079431 | 1457 | |
bea3348e SH |
1458 | local_irq_save(flags); |
1459 | sd = &__get_cpu_var(softnet_data); | |
1460 | skb->next = sd->completion_queue; | |
1461 | sd->completion_queue = skb; | |
1462 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
1463 | local_irq_restore(flags); | |
1464 | } | |
56079431 | 1465 | } |
bea3348e | 1466 | EXPORT_SYMBOL(dev_kfree_skb_irq); |
56079431 DV |
1467 | |
1468 | void dev_kfree_skb_any(struct sk_buff *skb) | |
1469 | { | |
1470 | if (in_irq() || irqs_disabled()) | |
1471 | dev_kfree_skb_irq(skb); | |
1472 | else | |
1473 | dev_kfree_skb(skb); | |
1474 | } | |
1475 | EXPORT_SYMBOL(dev_kfree_skb_any); | |
1476 | ||
1477 | ||
bea3348e SH |
1478 | /** |
1479 | * netif_device_detach - mark device as removed | |
1480 | * @dev: network device | |
1481 | * | |
1482 | * Mark device as removed from system and therefore no longer available. | |
1483 | */ | |
56079431 DV |
1484 | void netif_device_detach(struct net_device *dev) |
1485 | { | |
1486 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
1487 | netif_running(dev)) { | |
d543103a | 1488 | netif_tx_stop_all_queues(dev); |
56079431 DV |
1489 | } |
1490 | } | |
1491 | EXPORT_SYMBOL(netif_device_detach); | |
1492 | ||
bea3348e SH |
1493 | /** |
1494 | * netif_device_attach - mark device as attached | |
1495 | * @dev: network device | |
1496 | * | |
1497 | * Mark device as attached from system and restart if needed. | |
1498 | */ | |
56079431 DV |
1499 | void netif_device_attach(struct net_device *dev) |
1500 | { | |
1501 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
1502 | netif_running(dev)) { | |
d543103a | 1503 | netif_tx_wake_all_queues(dev); |
4ec93edb | 1504 | __netdev_watchdog_up(dev); |
56079431 DV |
1505 | } |
1506 | } | |
1507 | EXPORT_SYMBOL(netif_device_attach); | |
1508 | ||
6de329e2 BH |
1509 | static bool can_checksum_protocol(unsigned long features, __be16 protocol) |
1510 | { | |
1511 | return ((features & NETIF_F_GEN_CSUM) || | |
1512 | ((features & NETIF_F_IP_CSUM) && | |
1513 | protocol == htons(ETH_P_IP)) || | |
1514 | ((features & NETIF_F_IPV6_CSUM) && | |
1c8dbcf6 YZ |
1515 | protocol == htons(ETH_P_IPV6)) || |
1516 | ((features & NETIF_F_FCOE_CRC) && | |
1517 | protocol == htons(ETH_P_FCOE))); | |
6de329e2 BH |
1518 | } |
1519 | ||
1520 | static bool dev_can_checksum(struct net_device *dev, struct sk_buff *skb) | |
1521 | { | |
1522 | if (can_checksum_protocol(dev->features, skb->protocol)) | |
1523 | return true; | |
1524 | ||
1525 | if (skb->protocol == htons(ETH_P_8021Q)) { | |
1526 | struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data; | |
1527 | if (can_checksum_protocol(dev->features & dev->vlan_features, | |
1528 | veh->h_vlan_encapsulated_proto)) | |
1529 | return true; | |
1530 | } | |
1531 | ||
1532 | return false; | |
1533 | } | |
56079431 | 1534 | |
1da177e4 LT |
1535 | /* |
1536 | * Invalidate hardware checksum when packet is to be mangled, and | |
1537 | * complete checksum manually on outgoing path. | |
1538 | */ | |
84fa7933 | 1539 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 1540 | { |
d3bc23e7 | 1541 | __wsum csum; |
663ead3b | 1542 | int ret = 0, offset; |
1da177e4 | 1543 | |
84fa7933 | 1544 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
1545 | goto out_set_summed; |
1546 | ||
1547 | if (unlikely(skb_shinfo(skb)->gso_size)) { | |
a430a43d HX |
1548 | /* Let GSO fix up the checksum. */ |
1549 | goto out_set_summed; | |
1da177e4 LT |
1550 | } |
1551 | ||
a030847e HX |
1552 | offset = skb->csum_start - skb_headroom(skb); |
1553 | BUG_ON(offset >= skb_headlen(skb)); | |
1554 | csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
1555 | ||
1556 | offset += skb->csum_offset; | |
1557 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); | |
1558 | ||
1559 | if (skb_cloned(skb) && | |
1560 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { | |
1da177e4 LT |
1561 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
1562 | if (ret) | |
1563 | goto out; | |
1564 | } | |
1565 | ||
a030847e | 1566 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
a430a43d | 1567 | out_set_summed: |
1da177e4 | 1568 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 1569 | out: |
1da177e4 LT |
1570 | return ret; |
1571 | } | |
d1b19dff | 1572 | EXPORT_SYMBOL(skb_checksum_help); |
1da177e4 | 1573 | |
f6a78bfc HX |
1574 | /** |
1575 | * skb_gso_segment - Perform segmentation on skb. | |
1576 | * @skb: buffer to segment | |
576a30eb | 1577 | * @features: features for the output path (see dev->features) |
f6a78bfc HX |
1578 | * |
1579 | * This function segments the given skb and returns a list of segments. | |
576a30eb HX |
1580 | * |
1581 | * It may return NULL if the skb requires no segmentation. This is | |
1582 | * only possible when GSO is used for verifying header integrity. | |
f6a78bfc | 1583 | */ |
576a30eb | 1584 | struct sk_buff *skb_gso_segment(struct sk_buff *skb, int features) |
f6a78bfc HX |
1585 | { |
1586 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
1587 | struct packet_type *ptype; | |
252e3346 | 1588 | __be16 type = skb->protocol; |
a430a43d | 1589 | int err; |
f6a78bfc | 1590 | |
459a98ed | 1591 | skb_reset_mac_header(skb); |
b0e380b1 | 1592 | skb->mac_len = skb->network_header - skb->mac_header; |
f6a78bfc HX |
1593 | __skb_pull(skb, skb->mac_len); |
1594 | ||
67fd1a73 HX |
1595 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
1596 | struct net_device *dev = skb->dev; | |
1597 | struct ethtool_drvinfo info = {}; | |
1598 | ||
1599 | if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo) | |
1600 | dev->ethtool_ops->get_drvinfo(dev, &info); | |
1601 | ||
1602 | WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d " | |
1603 | "ip_summed=%d", | |
1604 | info.driver, dev ? dev->features : 0L, | |
1605 | skb->sk ? skb->sk->sk_route_caps : 0L, | |
1606 | skb->len, skb->data_len, skb->ip_summed); | |
1607 | ||
a430a43d HX |
1608 | if (skb_header_cloned(skb) && |
1609 | (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) | |
1610 | return ERR_PTR(err); | |
1611 | } | |
1612 | ||
f6a78bfc | 1613 | rcu_read_lock(); |
82d8a867 PE |
1614 | list_for_each_entry_rcu(ptype, |
1615 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { | |
f6a78bfc | 1616 | if (ptype->type == type && !ptype->dev && ptype->gso_segment) { |
84fa7933 | 1617 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
a430a43d HX |
1618 | err = ptype->gso_send_check(skb); |
1619 | segs = ERR_PTR(err); | |
1620 | if (err || skb_gso_ok(skb, features)) | |
1621 | break; | |
d56f90a7 ACM |
1622 | __skb_push(skb, (skb->data - |
1623 | skb_network_header(skb))); | |
a430a43d | 1624 | } |
576a30eb | 1625 | segs = ptype->gso_segment(skb, features); |
f6a78bfc HX |
1626 | break; |
1627 | } | |
1628 | } | |
1629 | rcu_read_unlock(); | |
1630 | ||
98e399f8 | 1631 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 1632 | |
f6a78bfc HX |
1633 | return segs; |
1634 | } | |
f6a78bfc HX |
1635 | EXPORT_SYMBOL(skb_gso_segment); |
1636 | ||
fb286bb2 HX |
1637 | /* Take action when hardware reception checksum errors are detected. */ |
1638 | #ifdef CONFIG_BUG | |
1639 | void netdev_rx_csum_fault(struct net_device *dev) | |
1640 | { | |
1641 | if (net_ratelimit()) { | |
4ec93edb | 1642 | printk(KERN_ERR "%s: hw csum failure.\n", |
246a4212 | 1643 | dev ? dev->name : "<unknown>"); |
fb286bb2 HX |
1644 | dump_stack(); |
1645 | } | |
1646 | } | |
1647 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
1648 | #endif | |
1649 | ||
1da177e4 LT |
1650 | /* Actually, we should eliminate this check as soon as we know, that: |
1651 | * 1. IOMMU is present and allows to map all the memory. | |
1652 | * 2. No high memory really exists on this machine. | |
1653 | */ | |
1654 | ||
1655 | static inline int illegal_highdma(struct net_device *dev, struct sk_buff *skb) | |
1656 | { | |
3d3a8533 | 1657 | #ifdef CONFIG_HIGHMEM |
1da177e4 LT |
1658 | int i; |
1659 | ||
1660 | if (dev->features & NETIF_F_HIGHDMA) | |
1661 | return 0; | |
1662 | ||
1663 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) | |
1664 | if (PageHighMem(skb_shinfo(skb)->frags[i].page)) | |
1665 | return 1; | |
1666 | ||
3d3a8533 | 1667 | #endif |
1da177e4 LT |
1668 | return 0; |
1669 | } | |
1da177e4 | 1670 | |
f6a78bfc HX |
1671 | struct dev_gso_cb { |
1672 | void (*destructor)(struct sk_buff *skb); | |
1673 | }; | |
1674 | ||
1675 | #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) | |
1676 | ||
1677 | static void dev_gso_skb_destructor(struct sk_buff *skb) | |
1678 | { | |
1679 | struct dev_gso_cb *cb; | |
1680 | ||
1681 | do { | |
1682 | struct sk_buff *nskb = skb->next; | |
1683 | ||
1684 | skb->next = nskb->next; | |
1685 | nskb->next = NULL; | |
1686 | kfree_skb(nskb); | |
1687 | } while (skb->next); | |
1688 | ||
1689 | cb = DEV_GSO_CB(skb); | |
1690 | if (cb->destructor) | |
1691 | cb->destructor(skb); | |
1692 | } | |
1693 | ||
1694 | /** | |
1695 | * dev_gso_segment - Perform emulated hardware segmentation on skb. | |
1696 | * @skb: buffer to segment | |
1697 | * | |
1698 | * This function segments the given skb and stores the list of segments | |
1699 | * in skb->next. | |
1700 | */ | |
1701 | static int dev_gso_segment(struct sk_buff *skb) | |
1702 | { | |
1703 | struct net_device *dev = skb->dev; | |
1704 | struct sk_buff *segs; | |
576a30eb HX |
1705 | int features = dev->features & ~(illegal_highdma(dev, skb) ? |
1706 | NETIF_F_SG : 0); | |
1707 | ||
1708 | segs = skb_gso_segment(skb, features); | |
1709 | ||
1710 | /* Verifying header integrity only. */ | |
1711 | if (!segs) | |
1712 | return 0; | |
f6a78bfc | 1713 | |
801678c5 | 1714 | if (IS_ERR(segs)) |
f6a78bfc HX |
1715 | return PTR_ERR(segs); |
1716 | ||
1717 | skb->next = segs; | |
1718 | DEV_GSO_CB(skb)->destructor = skb->destructor; | |
1719 | skb->destructor = dev_gso_skb_destructor; | |
1720 | ||
1721 | return 0; | |
1722 | } | |
1723 | ||
fd2ea0a7 DM |
1724 | int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, |
1725 | struct netdev_queue *txq) | |
f6a78bfc | 1726 | { |
00829823 | 1727 | const struct net_device_ops *ops = dev->netdev_ops; |
ac45f602 | 1728 | int rc; |
00829823 | 1729 | |
f6a78bfc | 1730 | if (likely(!skb->next)) { |
9be9a6b9 | 1731 | if (!list_empty(&ptype_all)) |
f6a78bfc HX |
1732 | dev_queue_xmit_nit(skb, dev); |
1733 | ||
576a30eb HX |
1734 | if (netif_needs_gso(dev, skb)) { |
1735 | if (unlikely(dev_gso_segment(skb))) | |
1736 | goto out_kfree_skb; | |
1737 | if (skb->next) | |
1738 | goto gso; | |
1739 | } | |
f6a78bfc | 1740 | |
93f154b5 ED |
1741 | /* |
1742 | * If device doesnt need skb->dst, release it right now while | |
1743 | * its hot in this cpu cache | |
1744 | */ | |
adf30907 ED |
1745 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) |
1746 | skb_dst_drop(skb); | |
1747 | ||
ac45f602 | 1748 | rc = ops->ndo_start_xmit(skb, dev); |
ec634fe3 | 1749 | if (rc == NETDEV_TX_OK) |
08baf561 | 1750 | txq_trans_update(txq); |
ac45f602 PO |
1751 | /* |
1752 | * TODO: if skb_orphan() was called by | |
1753 | * dev->hard_start_xmit() (for example, the unmodified | |
1754 | * igb driver does that; bnx2 doesn't), then | |
1755 | * skb_tx_software_timestamp() will be unable to send | |
1756 | * back the time stamp. | |
1757 | * | |
1758 | * How can this be prevented? Always create another | |
1759 | * reference to the socket before calling | |
1760 | * dev->hard_start_xmit()? Prevent that skb_orphan() | |
1761 | * does anything in dev->hard_start_xmit() by clearing | |
1762 | * the skb destructor before the call and restoring it | |
1763 | * afterwards, then doing the skb_orphan() ourselves? | |
1764 | */ | |
ac45f602 | 1765 | return rc; |
f6a78bfc HX |
1766 | } |
1767 | ||
576a30eb | 1768 | gso: |
f6a78bfc HX |
1769 | do { |
1770 | struct sk_buff *nskb = skb->next; | |
f6a78bfc HX |
1771 | |
1772 | skb->next = nskb->next; | |
1773 | nskb->next = NULL; | |
00829823 | 1774 | rc = ops->ndo_start_xmit(nskb, dev); |
ec634fe3 | 1775 | if (unlikely(rc != NETDEV_TX_OK)) { |
f54d9e8d | 1776 | nskb->next = skb->next; |
f6a78bfc HX |
1777 | skb->next = nskb; |
1778 | return rc; | |
1779 | } | |
08baf561 | 1780 | txq_trans_update(txq); |
fd2ea0a7 | 1781 | if (unlikely(netif_tx_queue_stopped(txq) && skb->next)) |
f54d9e8d | 1782 | return NETDEV_TX_BUSY; |
f6a78bfc | 1783 | } while (skb->next); |
4ec93edb | 1784 | |
f6a78bfc HX |
1785 | skb->destructor = DEV_GSO_CB(skb)->destructor; |
1786 | ||
1787 | out_kfree_skb: | |
1788 | kfree_skb(skb); | |
ec634fe3 | 1789 | return NETDEV_TX_OK; |
f6a78bfc HX |
1790 | } |
1791 | ||
7019298a | 1792 | static u32 skb_tx_hashrnd; |
b6b2fed1 | 1793 | |
9247744e | 1794 | u16 skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb) |
8f0f2223 | 1795 | { |
7019298a | 1796 | u32 hash; |
b6b2fed1 | 1797 | |
513de11b DM |
1798 | if (skb_rx_queue_recorded(skb)) { |
1799 | hash = skb_get_rx_queue(skb); | |
d1b19dff | 1800 | while (unlikely(hash >= dev->real_num_tx_queues)) |
513de11b DM |
1801 | hash -= dev->real_num_tx_queues; |
1802 | return hash; | |
1803 | } | |
ec581f6a ED |
1804 | |
1805 | if (skb->sk && skb->sk->sk_hash) | |
7019298a | 1806 | hash = skb->sk->sk_hash; |
ec581f6a | 1807 | else |
7019298a | 1808 | hash = skb->protocol; |
d5a9e24a | 1809 | |
7019298a | 1810 | hash = jhash_1word(hash, skb_tx_hashrnd); |
b6b2fed1 DM |
1811 | |
1812 | return (u16) (((u64) hash * dev->real_num_tx_queues) >> 32); | |
8f0f2223 | 1813 | } |
9247744e | 1814 | EXPORT_SYMBOL(skb_tx_hash); |
8f0f2223 | 1815 | |
e8a0464c DM |
1816 | static struct netdev_queue *dev_pick_tx(struct net_device *dev, |
1817 | struct sk_buff *skb) | |
1818 | { | |
a4ee3ce3 KK |
1819 | u16 queue_index; |
1820 | struct sock *sk = skb->sk; | |
1821 | ||
1822 | if (sk_tx_queue_recorded(sk)) { | |
1823 | queue_index = sk_tx_queue_get(sk); | |
1824 | } else { | |
1825 | const struct net_device_ops *ops = dev->netdev_ops; | |
1826 | ||
1827 | if (ops->ndo_select_queue) { | |
1828 | queue_index = ops->ndo_select_queue(dev, skb); | |
1829 | } else { | |
1830 | queue_index = 0; | |
1831 | if (dev->real_num_tx_queues > 1) | |
1832 | queue_index = skb_tx_hash(dev, skb); | |
fd2ea0a7 | 1833 | |
a4ee3ce3 KK |
1834 | if (sk && sk->sk_dst_cache) |
1835 | sk_tx_queue_set(sk, queue_index); | |
1836 | } | |
1837 | } | |
eae792b7 | 1838 | |
fd2ea0a7 DM |
1839 | skb_set_queue_mapping(skb, queue_index); |
1840 | return netdev_get_tx_queue(dev, queue_index); | |
e8a0464c DM |
1841 | } |
1842 | ||
bbd8a0d3 KK |
1843 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
1844 | struct net_device *dev, | |
1845 | struct netdev_queue *txq) | |
1846 | { | |
1847 | spinlock_t *root_lock = qdisc_lock(q); | |
1848 | int rc; | |
1849 | ||
1850 | spin_lock(root_lock); | |
1851 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { | |
1852 | kfree_skb(skb); | |
1853 | rc = NET_XMIT_DROP; | |
1854 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && | |
1855 | !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) { | |
1856 | /* | |
1857 | * This is a work-conserving queue; there are no old skbs | |
1858 | * waiting to be sent out; and the qdisc is not running - | |
1859 | * xmit the skb directly. | |
1860 | */ | |
1861 | __qdisc_update_bstats(q, skb->len); | |
1862 | if (sch_direct_xmit(skb, q, dev, txq, root_lock)) | |
1863 | __qdisc_run(q); | |
1864 | else | |
1865 | clear_bit(__QDISC_STATE_RUNNING, &q->state); | |
1866 | ||
1867 | rc = NET_XMIT_SUCCESS; | |
1868 | } else { | |
1869 | rc = qdisc_enqueue_root(skb, q); | |
1870 | qdisc_run(q); | |
1871 | } | |
1872 | spin_unlock(root_lock); | |
1873 | ||
1874 | return rc; | |
1875 | } | |
1876 | ||
d29f749e DJ |
1877 | /** |
1878 | * dev_queue_xmit - transmit a buffer | |
1879 | * @skb: buffer to transmit | |
1880 | * | |
1881 | * Queue a buffer for transmission to a network device. The caller must | |
1882 | * have set the device and priority and built the buffer before calling | |
1883 | * this function. The function can be called from an interrupt. | |
1884 | * | |
1885 | * A negative errno code is returned on a failure. A success does not | |
1886 | * guarantee the frame will be transmitted as it may be dropped due | |
1887 | * to congestion or traffic shaping. | |
1888 | * | |
1889 | * ----------------------------------------------------------------------------------- | |
1890 | * I notice this method can also return errors from the queue disciplines, | |
1891 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
1892 | * be positive. | |
1893 | * | |
1894 | * Regardless of the return value, the skb is consumed, so it is currently | |
1895 | * difficult to retry a send to this method. (You can bump the ref count | |
1896 | * before sending to hold a reference for retry if you are careful.) | |
1897 | * | |
1898 | * When calling this method, interrupts MUST be enabled. This is because | |
1899 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
1900 | * --BLG | |
1901 | */ | |
1da177e4 LT |
1902 | int dev_queue_xmit(struct sk_buff *skb) |
1903 | { | |
1904 | struct net_device *dev = skb->dev; | |
dc2b4847 | 1905 | struct netdev_queue *txq; |
1da177e4 LT |
1906 | struct Qdisc *q; |
1907 | int rc = -ENOMEM; | |
1908 | ||
f6a78bfc HX |
1909 | /* GSO will handle the following emulations directly. */ |
1910 | if (netif_needs_gso(dev, skb)) | |
1911 | goto gso; | |
1912 | ||
4cf704fb | 1913 | if (skb_has_frags(skb) && |
1da177e4 | 1914 | !(dev->features & NETIF_F_FRAGLIST) && |
364c6bad | 1915 | __skb_linearize(skb)) |
1da177e4 LT |
1916 | goto out_kfree_skb; |
1917 | ||
1918 | /* Fragmented skb is linearized if device does not support SG, | |
1919 | * or if at least one of fragments is in highmem and device | |
1920 | * does not support DMA from it. | |
1921 | */ | |
1922 | if (skb_shinfo(skb)->nr_frags && | |
1923 | (!(dev->features & NETIF_F_SG) || illegal_highdma(dev, skb)) && | |
364c6bad | 1924 | __skb_linearize(skb)) |
1da177e4 LT |
1925 | goto out_kfree_skb; |
1926 | ||
1927 | /* If packet is not checksummed and device does not support | |
1928 | * checksumming for this protocol, complete checksumming here. | |
1929 | */ | |
663ead3b HX |
1930 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
1931 | skb_set_transport_header(skb, skb->csum_start - | |
1932 | skb_headroom(skb)); | |
6de329e2 BH |
1933 | if (!dev_can_checksum(dev, skb) && skb_checksum_help(skb)) |
1934 | goto out_kfree_skb; | |
663ead3b | 1935 | } |
1da177e4 | 1936 | |
f6a78bfc | 1937 | gso: |
4ec93edb YH |
1938 | /* Disable soft irqs for various locks below. Also |
1939 | * stops preemption for RCU. | |
1da177e4 | 1940 | */ |
4ec93edb | 1941 | rcu_read_lock_bh(); |
1da177e4 | 1942 | |
eae792b7 | 1943 | txq = dev_pick_tx(dev, skb); |
b0e1e646 | 1944 | q = rcu_dereference(txq->qdisc); |
37437bb2 | 1945 | |
1da177e4 | 1946 | #ifdef CONFIG_NET_CLS_ACT |
d1b19dff | 1947 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS); |
1da177e4 LT |
1948 | #endif |
1949 | if (q->enqueue) { | |
bbd8a0d3 | 1950 | rc = __dev_xmit_skb(skb, q, dev, txq); |
37437bb2 | 1951 | goto out; |
1da177e4 LT |
1952 | } |
1953 | ||
1954 | /* The device has no queue. Common case for software devices: | |
1955 | loopback, all the sorts of tunnels... | |
1956 | ||
932ff279 HX |
1957 | Really, it is unlikely that netif_tx_lock protection is necessary |
1958 | here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
1da177e4 LT |
1959 | counters.) |
1960 | However, it is possible, that they rely on protection | |
1961 | made by us here. | |
1962 | ||
1963 | Check this and shot the lock. It is not prone from deadlocks. | |
1964 | Either shot noqueue qdisc, it is even simpler 8) | |
1965 | */ | |
1966 | if (dev->flags & IFF_UP) { | |
1967 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
1968 | ||
c773e847 | 1969 | if (txq->xmit_lock_owner != cpu) { |
1da177e4 | 1970 | |
c773e847 | 1971 | HARD_TX_LOCK(dev, txq, cpu); |
1da177e4 | 1972 | |
fd2ea0a7 | 1973 | if (!netif_tx_queue_stopped(txq)) { |
03a9a447 | 1974 | rc = NET_XMIT_SUCCESS; |
fd2ea0a7 | 1975 | if (!dev_hard_start_xmit(skb, dev, txq)) { |
c773e847 | 1976 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
1977 | goto out; |
1978 | } | |
1979 | } | |
c773e847 | 1980 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
1981 | if (net_ratelimit()) |
1982 | printk(KERN_CRIT "Virtual device %s asks to " | |
1983 | "queue packet!\n", dev->name); | |
1984 | } else { | |
1985 | /* Recursion is detected! It is possible, | |
1986 | * unfortunately */ | |
1987 | if (net_ratelimit()) | |
1988 | printk(KERN_CRIT "Dead loop on virtual device " | |
1989 | "%s, fix it urgently!\n", dev->name); | |
1990 | } | |
1991 | } | |
1992 | ||
1993 | rc = -ENETDOWN; | |
d4828d85 | 1994 | rcu_read_unlock_bh(); |
1da177e4 LT |
1995 | |
1996 | out_kfree_skb: | |
1997 | kfree_skb(skb); | |
1998 | return rc; | |
1999 | out: | |
d4828d85 | 2000 | rcu_read_unlock_bh(); |
1da177e4 LT |
2001 | return rc; |
2002 | } | |
d1b19dff | 2003 | EXPORT_SYMBOL(dev_queue_xmit); |
1da177e4 LT |
2004 | |
2005 | ||
2006 | /*======================================================================= | |
2007 | Receiver routines | |
2008 | =======================================================================*/ | |
2009 | ||
6b2bedc3 SH |
2010 | int netdev_max_backlog __read_mostly = 1000; |
2011 | int netdev_budget __read_mostly = 300; | |
2012 | int weight_p __read_mostly = 64; /* old backlog weight */ | |
1da177e4 LT |
2013 | |
2014 | DEFINE_PER_CPU(struct netif_rx_stats, netdev_rx_stat) = { 0, }; | |
2015 | ||
2016 | ||
1da177e4 LT |
2017 | /** |
2018 | * netif_rx - post buffer to the network code | |
2019 | * @skb: buffer to post | |
2020 | * | |
2021 | * This function receives a packet from a device driver and queues it for | |
2022 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
2023 | * may be dropped during processing for congestion control or by the | |
2024 | * protocol layers. | |
2025 | * | |
2026 | * return values: | |
2027 | * NET_RX_SUCCESS (no congestion) | |
1da177e4 LT |
2028 | * NET_RX_DROP (packet was dropped) |
2029 | * | |
2030 | */ | |
2031 | ||
2032 | int netif_rx(struct sk_buff *skb) | |
2033 | { | |
1da177e4 LT |
2034 | struct softnet_data *queue; |
2035 | unsigned long flags; | |
2036 | ||
2037 | /* if netpoll wants it, pretend we never saw it */ | |
2038 | if (netpoll_rx(skb)) | |
2039 | return NET_RX_DROP; | |
2040 | ||
b7aa0bf7 | 2041 | if (!skb->tstamp.tv64) |
a61bbcf2 | 2042 | net_timestamp(skb); |
1da177e4 LT |
2043 | |
2044 | /* | |
2045 | * The code is rearranged so that the path is the most | |
2046 | * short when CPU is congested, but is still operating. | |
2047 | */ | |
2048 | local_irq_save(flags); | |
1da177e4 LT |
2049 | queue = &__get_cpu_var(softnet_data); |
2050 | ||
2051 | __get_cpu_var(netdev_rx_stat).total++; | |
2052 | if (queue->input_pkt_queue.qlen <= netdev_max_backlog) { | |
2053 | if (queue->input_pkt_queue.qlen) { | |
1da177e4 | 2054 | enqueue: |
1da177e4 | 2055 | __skb_queue_tail(&queue->input_pkt_queue, skb); |
1da177e4 | 2056 | local_irq_restore(flags); |
34008d8c | 2057 | return NET_RX_SUCCESS; |
1da177e4 LT |
2058 | } |
2059 | ||
bea3348e | 2060 | napi_schedule(&queue->backlog); |
1da177e4 LT |
2061 | goto enqueue; |
2062 | } | |
2063 | ||
1da177e4 LT |
2064 | __get_cpu_var(netdev_rx_stat).dropped++; |
2065 | local_irq_restore(flags); | |
2066 | ||
2067 | kfree_skb(skb); | |
2068 | return NET_RX_DROP; | |
2069 | } | |
d1b19dff | 2070 | EXPORT_SYMBOL(netif_rx); |
1da177e4 LT |
2071 | |
2072 | int netif_rx_ni(struct sk_buff *skb) | |
2073 | { | |
2074 | int err; | |
2075 | ||
2076 | preempt_disable(); | |
2077 | err = netif_rx(skb); | |
2078 | if (local_softirq_pending()) | |
2079 | do_softirq(); | |
2080 | preempt_enable(); | |
2081 | ||
2082 | return err; | |
2083 | } | |
1da177e4 LT |
2084 | EXPORT_SYMBOL(netif_rx_ni); |
2085 | ||
1da177e4 LT |
2086 | static void net_tx_action(struct softirq_action *h) |
2087 | { | |
2088 | struct softnet_data *sd = &__get_cpu_var(softnet_data); | |
2089 | ||
2090 | if (sd->completion_queue) { | |
2091 | struct sk_buff *clist; | |
2092 | ||
2093 | local_irq_disable(); | |
2094 | clist = sd->completion_queue; | |
2095 | sd->completion_queue = NULL; | |
2096 | local_irq_enable(); | |
2097 | ||
2098 | while (clist) { | |
2099 | struct sk_buff *skb = clist; | |
2100 | clist = clist->next; | |
2101 | ||
547b792c | 2102 | WARN_ON(atomic_read(&skb->users)); |
1da177e4 LT |
2103 | __kfree_skb(skb); |
2104 | } | |
2105 | } | |
2106 | ||
2107 | if (sd->output_queue) { | |
37437bb2 | 2108 | struct Qdisc *head; |
1da177e4 LT |
2109 | |
2110 | local_irq_disable(); | |
2111 | head = sd->output_queue; | |
2112 | sd->output_queue = NULL; | |
2113 | local_irq_enable(); | |
2114 | ||
2115 | while (head) { | |
37437bb2 DM |
2116 | struct Qdisc *q = head; |
2117 | spinlock_t *root_lock; | |
2118 | ||
1da177e4 LT |
2119 | head = head->next_sched; |
2120 | ||
5fb66229 | 2121 | root_lock = qdisc_lock(q); |
37437bb2 | 2122 | if (spin_trylock(root_lock)) { |
def82a1d JP |
2123 | smp_mb__before_clear_bit(); |
2124 | clear_bit(__QDISC_STATE_SCHED, | |
2125 | &q->state); | |
37437bb2 DM |
2126 | qdisc_run(q); |
2127 | spin_unlock(root_lock); | |
1da177e4 | 2128 | } else { |
195648bb | 2129 | if (!test_bit(__QDISC_STATE_DEACTIVATED, |
e8a83e10 | 2130 | &q->state)) { |
195648bb | 2131 | __netif_reschedule(q); |
e8a83e10 JP |
2132 | } else { |
2133 | smp_mb__before_clear_bit(); | |
2134 | clear_bit(__QDISC_STATE_SCHED, | |
2135 | &q->state); | |
2136 | } | |
1da177e4 LT |
2137 | } |
2138 | } | |
2139 | } | |
2140 | } | |
2141 | ||
6f05f629 SH |
2142 | static inline int deliver_skb(struct sk_buff *skb, |
2143 | struct packet_type *pt_prev, | |
2144 | struct net_device *orig_dev) | |
1da177e4 LT |
2145 | { |
2146 | atomic_inc(&skb->users); | |
f2ccd8fa | 2147 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
1da177e4 LT |
2148 | } |
2149 | ||
2150 | #if defined(CONFIG_BRIDGE) || defined (CONFIG_BRIDGE_MODULE) | |
da678292 MM |
2151 | |
2152 | #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE) | |
2153 | /* This hook is defined here for ATM LANE */ | |
2154 | int (*br_fdb_test_addr_hook)(struct net_device *dev, | |
2155 | unsigned char *addr) __read_mostly; | |
4fb019a0 | 2156 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
da678292 | 2157 | #endif |
1da177e4 | 2158 | |
6229e362 SH |
2159 | /* |
2160 | * If bridge module is loaded call bridging hook. | |
2161 | * returns NULL if packet was consumed. | |
2162 | */ | |
2163 | struct sk_buff *(*br_handle_frame_hook)(struct net_bridge_port *p, | |
2164 | struct sk_buff *skb) __read_mostly; | |
4fb019a0 | 2165 | EXPORT_SYMBOL_GPL(br_handle_frame_hook); |
da678292 | 2166 | |
6229e362 SH |
2167 | static inline struct sk_buff *handle_bridge(struct sk_buff *skb, |
2168 | struct packet_type **pt_prev, int *ret, | |
2169 | struct net_device *orig_dev) | |
1da177e4 LT |
2170 | { |
2171 | struct net_bridge_port *port; | |
2172 | ||
6229e362 SH |
2173 | if (skb->pkt_type == PACKET_LOOPBACK || |
2174 | (port = rcu_dereference(skb->dev->br_port)) == NULL) | |
2175 | return skb; | |
1da177e4 LT |
2176 | |
2177 | if (*pt_prev) { | |
6229e362 | 2178 | *ret = deliver_skb(skb, *pt_prev, orig_dev); |
1da177e4 | 2179 | *pt_prev = NULL; |
4ec93edb YH |
2180 | } |
2181 | ||
6229e362 | 2182 | return br_handle_frame_hook(port, skb); |
1da177e4 LT |
2183 | } |
2184 | #else | |
6229e362 | 2185 | #define handle_bridge(skb, pt_prev, ret, orig_dev) (skb) |
1da177e4 LT |
2186 | #endif |
2187 | ||
b863ceb7 PM |
2188 | #if defined(CONFIG_MACVLAN) || defined(CONFIG_MACVLAN_MODULE) |
2189 | struct sk_buff *(*macvlan_handle_frame_hook)(struct sk_buff *skb) __read_mostly; | |
2190 | EXPORT_SYMBOL_GPL(macvlan_handle_frame_hook); | |
2191 | ||
2192 | static inline struct sk_buff *handle_macvlan(struct sk_buff *skb, | |
2193 | struct packet_type **pt_prev, | |
2194 | int *ret, | |
2195 | struct net_device *orig_dev) | |
2196 | { | |
2197 | if (skb->dev->macvlan_port == NULL) | |
2198 | return skb; | |
2199 | ||
2200 | if (*pt_prev) { | |
2201 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
2202 | *pt_prev = NULL; | |
2203 | } | |
2204 | return macvlan_handle_frame_hook(skb); | |
2205 | } | |
2206 | #else | |
2207 | #define handle_macvlan(skb, pt_prev, ret, orig_dev) (skb) | |
2208 | #endif | |
2209 | ||
1da177e4 LT |
2210 | #ifdef CONFIG_NET_CLS_ACT |
2211 | /* TODO: Maybe we should just force sch_ingress to be compiled in | |
2212 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions | |
2213 | * a compare and 2 stores extra right now if we dont have it on | |
2214 | * but have CONFIG_NET_CLS_ACT | |
4ec93edb | 2215 | * NOTE: This doesnt stop any functionality; if you dont have |
1da177e4 LT |
2216 | * the ingress scheduler, you just cant add policies on ingress. |
2217 | * | |
2218 | */ | |
4ec93edb | 2219 | static int ing_filter(struct sk_buff *skb) |
1da177e4 | 2220 | { |
1da177e4 | 2221 | struct net_device *dev = skb->dev; |
f697c3e8 | 2222 | u32 ttl = G_TC_RTTL(skb->tc_verd); |
555353cf DM |
2223 | struct netdev_queue *rxq; |
2224 | int result = TC_ACT_OK; | |
2225 | struct Qdisc *q; | |
4ec93edb | 2226 | |
f697c3e8 HX |
2227 | if (MAX_RED_LOOP < ttl++) { |
2228 | printk(KERN_WARNING | |
2229 | "Redir loop detected Dropping packet (%d->%d)\n", | |
2230 | skb->iif, dev->ifindex); | |
2231 | return TC_ACT_SHOT; | |
2232 | } | |
1da177e4 | 2233 | |
f697c3e8 HX |
2234 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl); |
2235 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS); | |
1da177e4 | 2236 | |
555353cf DM |
2237 | rxq = &dev->rx_queue; |
2238 | ||
83874000 | 2239 | q = rxq->qdisc; |
8d50b53d | 2240 | if (q != &noop_qdisc) { |
83874000 | 2241 | spin_lock(qdisc_lock(q)); |
a9312ae8 DM |
2242 | if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) |
2243 | result = qdisc_enqueue_root(skb, q); | |
83874000 DM |
2244 | spin_unlock(qdisc_lock(q)); |
2245 | } | |
f697c3e8 HX |
2246 | |
2247 | return result; | |
2248 | } | |
86e65da9 | 2249 | |
f697c3e8 HX |
2250 | static inline struct sk_buff *handle_ing(struct sk_buff *skb, |
2251 | struct packet_type **pt_prev, | |
2252 | int *ret, struct net_device *orig_dev) | |
2253 | { | |
8d50b53d | 2254 | if (skb->dev->rx_queue.qdisc == &noop_qdisc) |
f697c3e8 | 2255 | goto out; |
1da177e4 | 2256 | |
f697c3e8 HX |
2257 | if (*pt_prev) { |
2258 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
2259 | *pt_prev = NULL; | |
2260 | } else { | |
2261 | /* Huh? Why does turning on AF_PACKET affect this? */ | |
2262 | skb->tc_verd = SET_TC_OK2MUNGE(skb->tc_verd); | |
1da177e4 LT |
2263 | } |
2264 | ||
f697c3e8 HX |
2265 | switch (ing_filter(skb)) { |
2266 | case TC_ACT_SHOT: | |
2267 | case TC_ACT_STOLEN: | |
2268 | kfree_skb(skb); | |
2269 | return NULL; | |
2270 | } | |
2271 | ||
2272 | out: | |
2273 | skb->tc_verd = 0; | |
2274 | return skb; | |
1da177e4 LT |
2275 | } |
2276 | #endif | |
2277 | ||
bc1d0411 PM |
2278 | /* |
2279 | * netif_nit_deliver - deliver received packets to network taps | |
2280 | * @skb: buffer | |
2281 | * | |
2282 | * This function is used to deliver incoming packets to network | |
2283 | * taps. It should be used when the normal netif_receive_skb path | |
2284 | * is bypassed, for example because of VLAN acceleration. | |
2285 | */ | |
2286 | void netif_nit_deliver(struct sk_buff *skb) | |
2287 | { | |
2288 | struct packet_type *ptype; | |
2289 | ||
2290 | if (list_empty(&ptype_all)) | |
2291 | return; | |
2292 | ||
2293 | skb_reset_network_header(skb); | |
2294 | skb_reset_transport_header(skb); | |
2295 | skb->mac_len = skb->network_header - skb->mac_header; | |
2296 | ||
2297 | rcu_read_lock(); | |
2298 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
2299 | if (!ptype->dev || ptype->dev == skb->dev) | |
2300 | deliver_skb(skb, ptype, skb->dev); | |
2301 | } | |
2302 | rcu_read_unlock(); | |
2303 | } | |
2304 | ||
3b582cc1 SH |
2305 | /** |
2306 | * netif_receive_skb - process receive buffer from network | |
2307 | * @skb: buffer to process | |
2308 | * | |
2309 | * netif_receive_skb() is the main receive data processing function. | |
2310 | * It always succeeds. The buffer may be dropped during processing | |
2311 | * for congestion control or by the protocol layers. | |
2312 | * | |
2313 | * This function may only be called from softirq context and interrupts | |
2314 | * should be enabled. | |
2315 | * | |
2316 | * Return values (usually ignored): | |
2317 | * NET_RX_SUCCESS: no congestion | |
2318 | * NET_RX_DROP: packet was dropped | |
2319 | */ | |
1da177e4 LT |
2320 | int netif_receive_skb(struct sk_buff *skb) |
2321 | { | |
2322 | struct packet_type *ptype, *pt_prev; | |
f2ccd8fa | 2323 | struct net_device *orig_dev; |
0d7a3681 | 2324 | struct net_device *null_or_orig; |
1da177e4 | 2325 | int ret = NET_RX_DROP; |
252e3346 | 2326 | __be16 type; |
1da177e4 | 2327 | |
81bbb3d4 ED |
2328 | if (!skb->tstamp.tv64) |
2329 | net_timestamp(skb); | |
2330 | ||
05423b24 | 2331 | if (vlan_tx_tag_present(skb) && vlan_hwaccel_do_receive(skb)) |
9b22ea56 PM |
2332 | return NET_RX_SUCCESS; |
2333 | ||
1da177e4 | 2334 | /* if we've gotten here through NAPI, check netpoll */ |
bea3348e | 2335 | if (netpoll_receive_skb(skb)) |
1da177e4 LT |
2336 | return NET_RX_DROP; |
2337 | ||
c01003c2 PM |
2338 | if (!skb->iif) |
2339 | skb->iif = skb->dev->ifindex; | |
86e65da9 | 2340 | |
0d7a3681 | 2341 | null_or_orig = NULL; |
cc9bd5ce JE |
2342 | orig_dev = skb->dev; |
2343 | if (orig_dev->master) { | |
0d7a3681 JE |
2344 | if (skb_bond_should_drop(skb)) |
2345 | null_or_orig = orig_dev; /* deliver only exact match */ | |
2346 | else | |
2347 | skb->dev = orig_dev->master; | |
cc9bd5ce | 2348 | } |
8f903c70 | 2349 | |
1da177e4 LT |
2350 | __get_cpu_var(netdev_rx_stat).total++; |
2351 | ||
c1d2bbe1 | 2352 | skb_reset_network_header(skb); |
badff6d0 | 2353 | skb_reset_transport_header(skb); |
b0e380b1 | 2354 | skb->mac_len = skb->network_header - skb->mac_header; |
1da177e4 LT |
2355 | |
2356 | pt_prev = NULL; | |
2357 | ||
2358 | rcu_read_lock(); | |
2359 | ||
2360 | #ifdef CONFIG_NET_CLS_ACT | |
2361 | if (skb->tc_verd & TC_NCLS) { | |
2362 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
2363 | goto ncls; | |
2364 | } | |
2365 | #endif | |
2366 | ||
2367 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
f982307f JE |
2368 | if (ptype->dev == null_or_orig || ptype->dev == skb->dev || |
2369 | ptype->dev == orig_dev) { | |
4ec93edb | 2370 | if (pt_prev) |
f2ccd8fa | 2371 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
2372 | pt_prev = ptype; |
2373 | } | |
2374 | } | |
2375 | ||
2376 | #ifdef CONFIG_NET_CLS_ACT | |
f697c3e8 HX |
2377 | skb = handle_ing(skb, &pt_prev, &ret, orig_dev); |
2378 | if (!skb) | |
1da177e4 | 2379 | goto out; |
1da177e4 LT |
2380 | ncls: |
2381 | #endif | |
2382 | ||
6229e362 | 2383 | skb = handle_bridge(skb, &pt_prev, &ret, orig_dev); |
b863ceb7 PM |
2384 | if (!skb) |
2385 | goto out; | |
2386 | skb = handle_macvlan(skb, &pt_prev, &ret, orig_dev); | |
6229e362 | 2387 | if (!skb) |
1da177e4 LT |
2388 | goto out; |
2389 | ||
2390 | type = skb->protocol; | |
82d8a867 PE |
2391 | list_for_each_entry_rcu(ptype, |
2392 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { | |
1da177e4 | 2393 | if (ptype->type == type && |
f982307f JE |
2394 | (ptype->dev == null_or_orig || ptype->dev == skb->dev || |
2395 | ptype->dev == orig_dev)) { | |
4ec93edb | 2396 | if (pt_prev) |
f2ccd8fa | 2397 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
2398 | pt_prev = ptype; |
2399 | } | |
2400 | } | |
2401 | ||
2402 | if (pt_prev) { | |
f2ccd8fa | 2403 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
1da177e4 LT |
2404 | } else { |
2405 | kfree_skb(skb); | |
2406 | /* Jamal, now you will not able to escape explaining | |
2407 | * me how you were going to use this. :-) | |
2408 | */ | |
2409 | ret = NET_RX_DROP; | |
2410 | } | |
2411 | ||
2412 | out: | |
2413 | rcu_read_unlock(); | |
2414 | return ret; | |
2415 | } | |
d1b19dff | 2416 | EXPORT_SYMBOL(netif_receive_skb); |
1da177e4 | 2417 | |
6e583ce5 SH |
2418 | /* Network device is going away, flush any packets still pending */ |
2419 | static void flush_backlog(void *arg) | |
2420 | { | |
2421 | struct net_device *dev = arg; | |
2422 | struct softnet_data *queue = &__get_cpu_var(softnet_data); | |
2423 | struct sk_buff *skb, *tmp; | |
2424 | ||
2425 | skb_queue_walk_safe(&queue->input_pkt_queue, skb, tmp) | |
2426 | if (skb->dev == dev) { | |
2427 | __skb_unlink(skb, &queue->input_pkt_queue); | |
2428 | kfree_skb(skb); | |
2429 | } | |
2430 | } | |
2431 | ||
d565b0a1 HX |
2432 | static int napi_gro_complete(struct sk_buff *skb) |
2433 | { | |
2434 | struct packet_type *ptype; | |
2435 | __be16 type = skb->protocol; | |
2436 | struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; | |
2437 | int err = -ENOENT; | |
2438 | ||
fc59f9a3 HX |
2439 | if (NAPI_GRO_CB(skb)->count == 1) { |
2440 | skb_shinfo(skb)->gso_size = 0; | |
d565b0a1 | 2441 | goto out; |
fc59f9a3 | 2442 | } |
d565b0a1 HX |
2443 | |
2444 | rcu_read_lock(); | |
2445 | list_for_each_entry_rcu(ptype, head, list) { | |
2446 | if (ptype->type != type || ptype->dev || !ptype->gro_complete) | |
2447 | continue; | |
2448 | ||
2449 | err = ptype->gro_complete(skb); | |
2450 | break; | |
2451 | } | |
2452 | rcu_read_unlock(); | |
2453 | ||
2454 | if (err) { | |
2455 | WARN_ON(&ptype->list == head); | |
2456 | kfree_skb(skb); | |
2457 | return NET_RX_SUCCESS; | |
2458 | } | |
2459 | ||
2460 | out: | |
d565b0a1 HX |
2461 | return netif_receive_skb(skb); |
2462 | } | |
2463 | ||
2464 | void napi_gro_flush(struct napi_struct *napi) | |
2465 | { | |
2466 | struct sk_buff *skb, *next; | |
2467 | ||
2468 | for (skb = napi->gro_list; skb; skb = next) { | |
2469 | next = skb->next; | |
2470 | skb->next = NULL; | |
2471 | napi_gro_complete(skb); | |
2472 | } | |
2473 | ||
4ae5544f | 2474 | napi->gro_count = 0; |
d565b0a1 HX |
2475 | napi->gro_list = NULL; |
2476 | } | |
2477 | EXPORT_SYMBOL(napi_gro_flush); | |
2478 | ||
5b252f0c | 2479 | enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 HX |
2480 | { |
2481 | struct sk_buff **pp = NULL; | |
2482 | struct packet_type *ptype; | |
2483 | __be16 type = skb->protocol; | |
2484 | struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; | |
0da2afd5 | 2485 | int same_flow; |
d565b0a1 | 2486 | int mac_len; |
5b252f0c | 2487 | enum gro_result ret; |
d565b0a1 HX |
2488 | |
2489 | if (!(skb->dev->features & NETIF_F_GRO)) | |
2490 | goto normal; | |
2491 | ||
4cf704fb | 2492 | if (skb_is_gso(skb) || skb_has_frags(skb)) |
f17f5c91 HX |
2493 | goto normal; |
2494 | ||
d565b0a1 HX |
2495 | rcu_read_lock(); |
2496 | list_for_each_entry_rcu(ptype, head, list) { | |
d565b0a1 HX |
2497 | if (ptype->type != type || ptype->dev || !ptype->gro_receive) |
2498 | continue; | |
2499 | ||
86911732 | 2500 | skb_set_network_header(skb, skb_gro_offset(skb)); |
d565b0a1 HX |
2501 | mac_len = skb->network_header - skb->mac_header; |
2502 | skb->mac_len = mac_len; | |
2503 | NAPI_GRO_CB(skb)->same_flow = 0; | |
2504 | NAPI_GRO_CB(skb)->flush = 0; | |
5d38a079 | 2505 | NAPI_GRO_CB(skb)->free = 0; |
d565b0a1 | 2506 | |
d565b0a1 HX |
2507 | pp = ptype->gro_receive(&napi->gro_list, skb); |
2508 | break; | |
2509 | } | |
2510 | rcu_read_unlock(); | |
2511 | ||
2512 | if (&ptype->list == head) | |
2513 | goto normal; | |
2514 | ||
0da2afd5 | 2515 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
5d0d9be8 | 2516 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
0da2afd5 | 2517 | |
d565b0a1 HX |
2518 | if (pp) { |
2519 | struct sk_buff *nskb = *pp; | |
2520 | ||
2521 | *pp = nskb->next; | |
2522 | nskb->next = NULL; | |
2523 | napi_gro_complete(nskb); | |
4ae5544f | 2524 | napi->gro_count--; |
d565b0a1 HX |
2525 | } |
2526 | ||
0da2afd5 | 2527 | if (same_flow) |
d565b0a1 HX |
2528 | goto ok; |
2529 | ||
4ae5544f | 2530 | if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS) |
d565b0a1 | 2531 | goto normal; |
d565b0a1 | 2532 | |
4ae5544f | 2533 | napi->gro_count++; |
d565b0a1 | 2534 | NAPI_GRO_CB(skb)->count = 1; |
86911732 | 2535 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
d565b0a1 HX |
2536 | skb->next = napi->gro_list; |
2537 | napi->gro_list = skb; | |
5d0d9be8 | 2538 | ret = GRO_HELD; |
d565b0a1 | 2539 | |
ad0f9904 | 2540 | pull: |
cb18978c HX |
2541 | if (skb_headlen(skb) < skb_gro_offset(skb)) { |
2542 | int grow = skb_gro_offset(skb) - skb_headlen(skb); | |
2543 | ||
2544 | BUG_ON(skb->end - skb->tail < grow); | |
2545 | ||
2546 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); | |
2547 | ||
2548 | skb->tail += grow; | |
2549 | skb->data_len -= grow; | |
2550 | ||
2551 | skb_shinfo(skb)->frags[0].page_offset += grow; | |
2552 | skb_shinfo(skb)->frags[0].size -= grow; | |
2553 | ||
2554 | if (unlikely(!skb_shinfo(skb)->frags[0].size)) { | |
2555 | put_page(skb_shinfo(skb)->frags[0].page); | |
2556 | memmove(skb_shinfo(skb)->frags, | |
2557 | skb_shinfo(skb)->frags + 1, | |
2558 | --skb_shinfo(skb)->nr_frags); | |
2559 | } | |
ad0f9904 HX |
2560 | } |
2561 | ||
d565b0a1 | 2562 | ok: |
5d0d9be8 | 2563 | return ret; |
d565b0a1 HX |
2564 | |
2565 | normal: | |
ad0f9904 HX |
2566 | ret = GRO_NORMAL; |
2567 | goto pull; | |
5d38a079 | 2568 | } |
96e93eab HX |
2569 | EXPORT_SYMBOL(dev_gro_receive); |
2570 | ||
5b252f0c BH |
2571 | static gro_result_t |
2572 | __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) | |
96e93eab HX |
2573 | { |
2574 | struct sk_buff *p; | |
2575 | ||
d1c76af9 HX |
2576 | if (netpoll_rx_on(skb)) |
2577 | return GRO_NORMAL; | |
2578 | ||
96e93eab | 2579 | for (p = napi->gro_list; p; p = p->next) { |
f2bde732 SH |
2580 | NAPI_GRO_CB(p)->same_flow = (p->dev == skb->dev) |
2581 | && !compare_ether_header(skb_mac_header(p), | |
2582 | skb_gro_mac_header(skb)); | |
96e93eab HX |
2583 | NAPI_GRO_CB(p)->flush = 0; |
2584 | } | |
2585 | ||
2586 | return dev_gro_receive(napi, skb); | |
2587 | } | |
5d38a079 | 2588 | |
c7c4b3b6 | 2589 | gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb) |
5d38a079 | 2590 | { |
5d0d9be8 HX |
2591 | switch (ret) { |
2592 | case GRO_NORMAL: | |
c7c4b3b6 BH |
2593 | if (netif_receive_skb(skb)) |
2594 | ret = GRO_DROP; | |
2595 | break; | |
5d38a079 | 2596 | |
5d0d9be8 | 2597 | case GRO_DROP: |
5d0d9be8 | 2598 | case GRO_MERGED_FREE: |
5d38a079 HX |
2599 | kfree_skb(skb); |
2600 | break; | |
5b252f0c BH |
2601 | |
2602 | case GRO_HELD: | |
2603 | case GRO_MERGED: | |
2604 | break; | |
5d38a079 HX |
2605 | } |
2606 | ||
c7c4b3b6 | 2607 | return ret; |
5d0d9be8 HX |
2608 | } |
2609 | EXPORT_SYMBOL(napi_skb_finish); | |
2610 | ||
78a478d0 HX |
2611 | void skb_gro_reset_offset(struct sk_buff *skb) |
2612 | { | |
2613 | NAPI_GRO_CB(skb)->data_offset = 0; | |
2614 | NAPI_GRO_CB(skb)->frag0 = NULL; | |
7489594c | 2615 | NAPI_GRO_CB(skb)->frag0_len = 0; |
78a478d0 | 2616 | |
78d3fd0b | 2617 | if (skb->mac_header == skb->tail && |
7489594c | 2618 | !PageHighMem(skb_shinfo(skb)->frags[0].page)) { |
78a478d0 HX |
2619 | NAPI_GRO_CB(skb)->frag0 = |
2620 | page_address(skb_shinfo(skb)->frags[0].page) + | |
2621 | skb_shinfo(skb)->frags[0].page_offset; | |
7489594c HX |
2622 | NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size; |
2623 | } | |
78a478d0 HX |
2624 | } |
2625 | EXPORT_SYMBOL(skb_gro_reset_offset); | |
2626 | ||
c7c4b3b6 | 2627 | gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
5d0d9be8 | 2628 | { |
86911732 HX |
2629 | skb_gro_reset_offset(skb); |
2630 | ||
5d0d9be8 | 2631 | return napi_skb_finish(__napi_gro_receive(napi, skb), skb); |
d565b0a1 HX |
2632 | } |
2633 | EXPORT_SYMBOL(napi_gro_receive); | |
2634 | ||
96e93eab HX |
2635 | void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
2636 | { | |
96e93eab HX |
2637 | __skb_pull(skb, skb_headlen(skb)); |
2638 | skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb)); | |
2639 | ||
2640 | napi->skb = skb; | |
2641 | } | |
2642 | EXPORT_SYMBOL(napi_reuse_skb); | |
2643 | ||
76620aaf | 2644 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
5d38a079 | 2645 | { |
5d38a079 | 2646 | struct sk_buff *skb = napi->skb; |
5d38a079 HX |
2647 | |
2648 | if (!skb) { | |
89d71a66 ED |
2649 | skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD); |
2650 | if (skb) | |
2651 | napi->skb = skb; | |
80595d59 | 2652 | } |
96e93eab HX |
2653 | return skb; |
2654 | } | |
76620aaf | 2655 | EXPORT_SYMBOL(napi_get_frags); |
96e93eab | 2656 | |
c7c4b3b6 BH |
2657 | gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, |
2658 | gro_result_t ret) | |
96e93eab | 2659 | { |
5d0d9be8 HX |
2660 | switch (ret) { |
2661 | case GRO_NORMAL: | |
86911732 | 2662 | case GRO_HELD: |
86911732 HX |
2663 | skb->protocol = eth_type_trans(skb, napi->dev); |
2664 | ||
c7c4b3b6 BH |
2665 | if (ret == GRO_HELD) |
2666 | skb_gro_pull(skb, -ETH_HLEN); | |
2667 | else if (netif_receive_skb(skb)) | |
2668 | ret = GRO_DROP; | |
86911732 | 2669 | break; |
5d38a079 | 2670 | |
5d0d9be8 | 2671 | case GRO_DROP: |
5d0d9be8 HX |
2672 | case GRO_MERGED_FREE: |
2673 | napi_reuse_skb(napi, skb); | |
2674 | break; | |
5b252f0c BH |
2675 | |
2676 | case GRO_MERGED: | |
2677 | break; | |
5d0d9be8 | 2678 | } |
5d38a079 | 2679 | |
c7c4b3b6 | 2680 | return ret; |
5d38a079 | 2681 | } |
5d0d9be8 HX |
2682 | EXPORT_SYMBOL(napi_frags_finish); |
2683 | ||
76620aaf HX |
2684 | struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
2685 | { | |
2686 | struct sk_buff *skb = napi->skb; | |
2687 | struct ethhdr *eth; | |
a5b1cf28 HX |
2688 | unsigned int hlen; |
2689 | unsigned int off; | |
76620aaf HX |
2690 | |
2691 | napi->skb = NULL; | |
2692 | ||
2693 | skb_reset_mac_header(skb); | |
2694 | skb_gro_reset_offset(skb); | |
2695 | ||
a5b1cf28 HX |
2696 | off = skb_gro_offset(skb); |
2697 | hlen = off + sizeof(*eth); | |
2698 | eth = skb_gro_header_fast(skb, off); | |
2699 | if (skb_gro_header_hard(skb, hlen)) { | |
2700 | eth = skb_gro_header_slow(skb, hlen, off); | |
2701 | if (unlikely(!eth)) { | |
2702 | napi_reuse_skb(napi, skb); | |
2703 | skb = NULL; | |
2704 | goto out; | |
2705 | } | |
76620aaf HX |
2706 | } |
2707 | ||
2708 | skb_gro_pull(skb, sizeof(*eth)); | |
2709 | ||
2710 | /* | |
2711 | * This works because the only protocols we care about don't require | |
2712 | * special handling. We'll fix it up properly at the end. | |
2713 | */ | |
2714 | skb->protocol = eth->h_proto; | |
2715 | ||
2716 | out: | |
2717 | return skb; | |
2718 | } | |
2719 | EXPORT_SYMBOL(napi_frags_skb); | |
2720 | ||
c7c4b3b6 | 2721 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
5d0d9be8 | 2722 | { |
76620aaf | 2723 | struct sk_buff *skb = napi_frags_skb(napi); |
5d0d9be8 HX |
2724 | |
2725 | if (!skb) | |
c7c4b3b6 | 2726 | return GRO_DROP; |
5d0d9be8 HX |
2727 | |
2728 | return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb)); | |
2729 | } | |
5d38a079 HX |
2730 | EXPORT_SYMBOL(napi_gro_frags); |
2731 | ||
bea3348e | 2732 | static int process_backlog(struct napi_struct *napi, int quota) |
1da177e4 LT |
2733 | { |
2734 | int work = 0; | |
1da177e4 LT |
2735 | struct softnet_data *queue = &__get_cpu_var(softnet_data); |
2736 | unsigned long start_time = jiffies; | |
2737 | ||
bea3348e SH |
2738 | napi->weight = weight_p; |
2739 | do { | |
1da177e4 | 2740 | struct sk_buff *skb; |
1da177e4 LT |
2741 | |
2742 | local_irq_disable(); | |
2743 | skb = __skb_dequeue(&queue->input_pkt_queue); | |
bea3348e | 2744 | if (!skb) { |
8f1ead2d | 2745 | __napi_complete(napi); |
bea3348e | 2746 | local_irq_enable(); |
8f1ead2d | 2747 | break; |
bea3348e | 2748 | } |
1da177e4 LT |
2749 | local_irq_enable(); |
2750 | ||
8f1ead2d | 2751 | netif_receive_skb(skb); |
bea3348e | 2752 | } while (++work < quota && jiffies == start_time); |
1da177e4 | 2753 | |
bea3348e SH |
2754 | return work; |
2755 | } | |
1da177e4 | 2756 | |
bea3348e SH |
2757 | /** |
2758 | * __napi_schedule - schedule for receive | |
c4ea43c5 | 2759 | * @n: entry to schedule |
bea3348e SH |
2760 | * |
2761 | * The entry's receive function will be scheduled to run | |
2762 | */ | |
b5606c2d | 2763 | void __napi_schedule(struct napi_struct *n) |
bea3348e SH |
2764 | { |
2765 | unsigned long flags; | |
1da177e4 | 2766 | |
bea3348e SH |
2767 | local_irq_save(flags); |
2768 | list_add_tail(&n->poll_list, &__get_cpu_var(softnet_data).poll_list); | |
2769 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
2770 | local_irq_restore(flags); | |
1da177e4 | 2771 | } |
bea3348e SH |
2772 | EXPORT_SYMBOL(__napi_schedule); |
2773 | ||
d565b0a1 HX |
2774 | void __napi_complete(struct napi_struct *n) |
2775 | { | |
2776 | BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); | |
2777 | BUG_ON(n->gro_list); | |
2778 | ||
2779 | list_del(&n->poll_list); | |
2780 | smp_mb__before_clear_bit(); | |
2781 | clear_bit(NAPI_STATE_SCHED, &n->state); | |
2782 | } | |
2783 | EXPORT_SYMBOL(__napi_complete); | |
2784 | ||
2785 | void napi_complete(struct napi_struct *n) | |
2786 | { | |
2787 | unsigned long flags; | |
2788 | ||
2789 | /* | |
2790 | * don't let napi dequeue from the cpu poll list | |
2791 | * just in case its running on a different cpu | |
2792 | */ | |
2793 | if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state))) | |
2794 | return; | |
2795 | ||
2796 | napi_gro_flush(n); | |
2797 | local_irq_save(flags); | |
2798 | __napi_complete(n); | |
2799 | local_irq_restore(flags); | |
2800 | } | |
2801 | EXPORT_SYMBOL(napi_complete); | |
2802 | ||
2803 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, | |
2804 | int (*poll)(struct napi_struct *, int), int weight) | |
2805 | { | |
2806 | INIT_LIST_HEAD(&napi->poll_list); | |
4ae5544f | 2807 | napi->gro_count = 0; |
d565b0a1 | 2808 | napi->gro_list = NULL; |
5d38a079 | 2809 | napi->skb = NULL; |
d565b0a1 HX |
2810 | napi->poll = poll; |
2811 | napi->weight = weight; | |
2812 | list_add(&napi->dev_list, &dev->napi_list); | |
d565b0a1 | 2813 | napi->dev = dev; |
5d38a079 | 2814 | #ifdef CONFIG_NETPOLL |
d565b0a1 HX |
2815 | spin_lock_init(&napi->poll_lock); |
2816 | napi->poll_owner = -1; | |
2817 | #endif | |
2818 | set_bit(NAPI_STATE_SCHED, &napi->state); | |
2819 | } | |
2820 | EXPORT_SYMBOL(netif_napi_add); | |
2821 | ||
2822 | void netif_napi_del(struct napi_struct *napi) | |
2823 | { | |
2824 | struct sk_buff *skb, *next; | |
2825 | ||
d7b06636 | 2826 | list_del_init(&napi->dev_list); |
76620aaf | 2827 | napi_free_frags(napi); |
d565b0a1 HX |
2828 | |
2829 | for (skb = napi->gro_list; skb; skb = next) { | |
2830 | next = skb->next; | |
2831 | skb->next = NULL; | |
2832 | kfree_skb(skb); | |
2833 | } | |
2834 | ||
2835 | napi->gro_list = NULL; | |
4ae5544f | 2836 | napi->gro_count = 0; |
d565b0a1 HX |
2837 | } |
2838 | EXPORT_SYMBOL(netif_napi_del); | |
2839 | ||
1da177e4 LT |
2840 | |
2841 | static void net_rx_action(struct softirq_action *h) | |
2842 | { | |
bea3348e | 2843 | struct list_head *list = &__get_cpu_var(softnet_data).poll_list; |
24f8b238 | 2844 | unsigned long time_limit = jiffies + 2; |
51b0bded | 2845 | int budget = netdev_budget; |
53fb95d3 MM |
2846 | void *have; |
2847 | ||
1da177e4 LT |
2848 | local_irq_disable(); |
2849 | ||
bea3348e SH |
2850 | while (!list_empty(list)) { |
2851 | struct napi_struct *n; | |
2852 | int work, weight; | |
1da177e4 | 2853 | |
bea3348e | 2854 | /* If softirq window is exhuasted then punt. |
24f8b238 SH |
2855 | * Allow this to run for 2 jiffies since which will allow |
2856 | * an average latency of 1.5/HZ. | |
bea3348e | 2857 | */ |
24f8b238 | 2858 | if (unlikely(budget <= 0 || time_after(jiffies, time_limit))) |
1da177e4 LT |
2859 | goto softnet_break; |
2860 | ||
2861 | local_irq_enable(); | |
2862 | ||
bea3348e SH |
2863 | /* Even though interrupts have been re-enabled, this |
2864 | * access is safe because interrupts can only add new | |
2865 | * entries to the tail of this list, and only ->poll() | |
2866 | * calls can remove this head entry from the list. | |
2867 | */ | |
2868 | n = list_entry(list->next, struct napi_struct, poll_list); | |
1da177e4 | 2869 | |
bea3348e SH |
2870 | have = netpoll_poll_lock(n); |
2871 | ||
2872 | weight = n->weight; | |
2873 | ||
0a7606c1 DM |
2874 | /* This NAPI_STATE_SCHED test is for avoiding a race |
2875 | * with netpoll's poll_napi(). Only the entity which | |
2876 | * obtains the lock and sees NAPI_STATE_SCHED set will | |
2877 | * actually make the ->poll() call. Therefore we avoid | |
2878 | * accidently calling ->poll() when NAPI is not scheduled. | |
2879 | */ | |
2880 | work = 0; | |
4ea7e386 | 2881 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { |
0a7606c1 | 2882 | work = n->poll(n, weight); |
4ea7e386 NH |
2883 | trace_napi_poll(n); |
2884 | } | |
bea3348e SH |
2885 | |
2886 | WARN_ON_ONCE(work > weight); | |
2887 | ||
2888 | budget -= work; | |
2889 | ||
2890 | local_irq_disable(); | |
2891 | ||
2892 | /* Drivers must not modify the NAPI state if they | |
2893 | * consume the entire weight. In such cases this code | |
2894 | * still "owns" the NAPI instance and therefore can | |
2895 | * move the instance around on the list at-will. | |
2896 | */ | |
fed17f30 | 2897 | if (unlikely(work == weight)) { |
ff780cd8 HX |
2898 | if (unlikely(napi_disable_pending(n))) { |
2899 | local_irq_enable(); | |
2900 | napi_complete(n); | |
2901 | local_irq_disable(); | |
2902 | } else | |
fed17f30 DM |
2903 | list_move_tail(&n->poll_list, list); |
2904 | } | |
bea3348e SH |
2905 | |
2906 | netpoll_poll_unlock(have); | |
1da177e4 LT |
2907 | } |
2908 | out: | |
515e06c4 | 2909 | local_irq_enable(); |
bea3348e | 2910 | |
db217334 CL |
2911 | #ifdef CONFIG_NET_DMA |
2912 | /* | |
2913 | * There may not be any more sk_buffs coming right now, so push | |
2914 | * any pending DMA copies to hardware | |
2915 | */ | |
2ba05622 | 2916 | dma_issue_pending_all(); |
db217334 | 2917 | #endif |
bea3348e | 2918 | |
1da177e4 LT |
2919 | return; |
2920 | ||
2921 | softnet_break: | |
2922 | __get_cpu_var(netdev_rx_stat).time_squeeze++; | |
2923 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
2924 | goto out; | |
2925 | } | |
2926 | ||
d1b19dff | 2927 | static gifconf_func_t *gifconf_list[NPROTO]; |
1da177e4 LT |
2928 | |
2929 | /** | |
2930 | * register_gifconf - register a SIOCGIF handler | |
2931 | * @family: Address family | |
2932 | * @gifconf: Function handler | |
2933 | * | |
2934 | * Register protocol dependent address dumping routines. The handler | |
2935 | * that is passed must not be freed or reused until it has been replaced | |
2936 | * by another handler. | |
2937 | */ | |
d1b19dff | 2938 | int register_gifconf(unsigned int family, gifconf_func_t *gifconf) |
1da177e4 LT |
2939 | { |
2940 | if (family >= NPROTO) | |
2941 | return -EINVAL; | |
2942 | gifconf_list[family] = gifconf; | |
2943 | return 0; | |
2944 | } | |
d1b19dff | 2945 | EXPORT_SYMBOL(register_gifconf); |
1da177e4 LT |
2946 | |
2947 | ||
2948 | /* | |
2949 | * Map an interface index to its name (SIOCGIFNAME) | |
2950 | */ | |
2951 | ||
2952 | /* | |
2953 | * We need this ioctl for efficient implementation of the | |
2954 | * if_indextoname() function required by the IPv6 API. Without | |
2955 | * it, we would have to search all the interfaces to find a | |
2956 | * match. --pb | |
2957 | */ | |
2958 | ||
881d966b | 2959 | static int dev_ifname(struct net *net, struct ifreq __user *arg) |
1da177e4 LT |
2960 | { |
2961 | struct net_device *dev; | |
2962 | struct ifreq ifr; | |
2963 | ||
2964 | /* | |
2965 | * Fetch the caller's info block. | |
2966 | */ | |
2967 | ||
2968 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
2969 | return -EFAULT; | |
2970 | ||
fb699dfd ED |
2971 | rcu_read_lock(); |
2972 | dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex); | |
1da177e4 | 2973 | if (!dev) { |
fb699dfd | 2974 | rcu_read_unlock(); |
1da177e4 LT |
2975 | return -ENODEV; |
2976 | } | |
2977 | ||
2978 | strcpy(ifr.ifr_name, dev->name); | |
fb699dfd | 2979 | rcu_read_unlock(); |
1da177e4 LT |
2980 | |
2981 | if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) | |
2982 | return -EFAULT; | |
2983 | return 0; | |
2984 | } | |
2985 | ||
2986 | /* | |
2987 | * Perform a SIOCGIFCONF call. This structure will change | |
2988 | * size eventually, and there is nothing I can do about it. | |
2989 | * Thus we will need a 'compatibility mode'. | |
2990 | */ | |
2991 | ||
881d966b | 2992 | static int dev_ifconf(struct net *net, char __user *arg) |
1da177e4 LT |
2993 | { |
2994 | struct ifconf ifc; | |
2995 | struct net_device *dev; | |
2996 | char __user *pos; | |
2997 | int len; | |
2998 | int total; | |
2999 | int i; | |
3000 | ||
3001 | /* | |
3002 | * Fetch the caller's info block. | |
3003 | */ | |
3004 | ||
3005 | if (copy_from_user(&ifc, arg, sizeof(struct ifconf))) | |
3006 | return -EFAULT; | |
3007 | ||
3008 | pos = ifc.ifc_buf; | |
3009 | len = ifc.ifc_len; | |
3010 | ||
3011 | /* | |
3012 | * Loop over the interfaces, and write an info block for each. | |
3013 | */ | |
3014 | ||
3015 | total = 0; | |
881d966b | 3016 | for_each_netdev(net, dev) { |
1da177e4 LT |
3017 | for (i = 0; i < NPROTO; i++) { |
3018 | if (gifconf_list[i]) { | |
3019 | int done; | |
3020 | if (!pos) | |
3021 | done = gifconf_list[i](dev, NULL, 0); | |
3022 | else | |
3023 | done = gifconf_list[i](dev, pos + total, | |
3024 | len - total); | |
3025 | if (done < 0) | |
3026 | return -EFAULT; | |
3027 | total += done; | |
3028 | } | |
3029 | } | |
4ec93edb | 3030 | } |
1da177e4 LT |
3031 | |
3032 | /* | |
3033 | * All done. Write the updated control block back to the caller. | |
3034 | */ | |
3035 | ifc.ifc_len = total; | |
3036 | ||
3037 | /* | |
3038 | * Both BSD and Solaris return 0 here, so we do too. | |
3039 | */ | |
3040 | return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0; | |
3041 | } | |
3042 | ||
3043 | #ifdef CONFIG_PROC_FS | |
3044 | /* | |
3045 | * This is invoked by the /proc filesystem handler to display a device | |
3046 | * in detail. | |
3047 | */ | |
7562f876 | 3048 | void *dev_seq_start(struct seq_file *seq, loff_t *pos) |
9a429c49 | 3049 | __acquires(dev_base_lock) |
1da177e4 | 3050 | { |
e372c414 | 3051 | struct net *net = seq_file_net(seq); |
7562f876 | 3052 | loff_t off; |
1da177e4 | 3053 | struct net_device *dev; |
1da177e4 | 3054 | |
7562f876 PE |
3055 | read_lock(&dev_base_lock); |
3056 | if (!*pos) | |
3057 | return SEQ_START_TOKEN; | |
1da177e4 | 3058 | |
7562f876 | 3059 | off = 1; |
881d966b | 3060 | for_each_netdev(net, dev) |
7562f876 PE |
3061 | if (off++ == *pos) |
3062 | return dev; | |
1da177e4 | 3063 | |
7562f876 | 3064 | return NULL; |
1da177e4 LT |
3065 | } |
3066 | ||
3067 | void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3068 | { | |
e372c414 | 3069 | struct net *net = seq_file_net(seq); |
1da177e4 | 3070 | ++*pos; |
7562f876 | 3071 | return v == SEQ_START_TOKEN ? |
881d966b | 3072 | first_net_device(net) : next_net_device((struct net_device *)v); |
1da177e4 LT |
3073 | } |
3074 | ||
3075 | void dev_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 3076 | __releases(dev_base_lock) |
1da177e4 LT |
3077 | { |
3078 | read_unlock(&dev_base_lock); | |
3079 | } | |
3080 | ||
3081 | static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) | |
3082 | { | |
eeda3fd6 | 3083 | const struct net_device_stats *stats = dev_get_stats(dev); |
1da177e4 | 3084 | |
5a1b5898 RR |
3085 | seq_printf(seq, "%6s:%8lu %7lu %4lu %4lu %4lu %5lu %10lu %9lu " |
3086 | "%8lu %7lu %4lu %4lu %4lu %5lu %7lu %10lu\n", | |
3087 | dev->name, stats->rx_bytes, stats->rx_packets, | |
3088 | stats->rx_errors, | |
3089 | stats->rx_dropped + stats->rx_missed_errors, | |
3090 | stats->rx_fifo_errors, | |
3091 | stats->rx_length_errors + stats->rx_over_errors + | |
3092 | stats->rx_crc_errors + stats->rx_frame_errors, | |
3093 | stats->rx_compressed, stats->multicast, | |
3094 | stats->tx_bytes, stats->tx_packets, | |
3095 | stats->tx_errors, stats->tx_dropped, | |
3096 | stats->tx_fifo_errors, stats->collisions, | |
3097 | stats->tx_carrier_errors + | |
3098 | stats->tx_aborted_errors + | |
3099 | stats->tx_window_errors + | |
3100 | stats->tx_heartbeat_errors, | |
3101 | stats->tx_compressed); | |
1da177e4 LT |
3102 | } |
3103 | ||
3104 | /* | |
3105 | * Called from the PROCfs module. This now uses the new arbitrary sized | |
3106 | * /proc/net interface to create /proc/net/dev | |
3107 | */ | |
3108 | static int dev_seq_show(struct seq_file *seq, void *v) | |
3109 | { | |
3110 | if (v == SEQ_START_TOKEN) | |
3111 | seq_puts(seq, "Inter-| Receive " | |
3112 | " | Transmit\n" | |
3113 | " face |bytes packets errs drop fifo frame " | |
3114 | "compressed multicast|bytes packets errs " | |
3115 | "drop fifo colls carrier compressed\n"); | |
3116 | else | |
3117 | dev_seq_printf_stats(seq, v); | |
3118 | return 0; | |
3119 | } | |
3120 | ||
3121 | static struct netif_rx_stats *softnet_get_online(loff_t *pos) | |
3122 | { | |
3123 | struct netif_rx_stats *rc = NULL; | |
3124 | ||
0c0b0aca | 3125 | while (*pos < nr_cpu_ids) |
4ec93edb | 3126 | if (cpu_online(*pos)) { |
1da177e4 LT |
3127 | rc = &per_cpu(netdev_rx_stat, *pos); |
3128 | break; | |
3129 | } else | |
3130 | ++*pos; | |
3131 | return rc; | |
3132 | } | |
3133 | ||
3134 | static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) | |
3135 | { | |
3136 | return softnet_get_online(pos); | |
3137 | } | |
3138 | ||
3139 | static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3140 | { | |
3141 | ++*pos; | |
3142 | return softnet_get_online(pos); | |
3143 | } | |
3144 | ||
3145 | static void softnet_seq_stop(struct seq_file *seq, void *v) | |
3146 | { | |
3147 | } | |
3148 | ||
3149 | static int softnet_seq_show(struct seq_file *seq, void *v) | |
3150 | { | |
3151 | struct netif_rx_stats *s = v; | |
3152 | ||
3153 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x\n", | |
31aa02c5 | 3154 | s->total, s->dropped, s->time_squeeze, 0, |
c1ebcdb8 | 3155 | 0, 0, 0, 0, /* was fastroute */ |
d1b19dff | 3156 | s->cpu_collision); |
1da177e4 LT |
3157 | return 0; |
3158 | } | |
3159 | ||
f690808e | 3160 | static const struct seq_operations dev_seq_ops = { |
1da177e4 LT |
3161 | .start = dev_seq_start, |
3162 | .next = dev_seq_next, | |
3163 | .stop = dev_seq_stop, | |
3164 | .show = dev_seq_show, | |
3165 | }; | |
3166 | ||
3167 | static int dev_seq_open(struct inode *inode, struct file *file) | |
3168 | { | |
e372c414 DL |
3169 | return seq_open_net(inode, file, &dev_seq_ops, |
3170 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
3171 | } |
3172 | ||
9a32144e | 3173 | static const struct file_operations dev_seq_fops = { |
1da177e4 LT |
3174 | .owner = THIS_MODULE, |
3175 | .open = dev_seq_open, | |
3176 | .read = seq_read, | |
3177 | .llseek = seq_lseek, | |
e372c414 | 3178 | .release = seq_release_net, |
1da177e4 LT |
3179 | }; |
3180 | ||
f690808e | 3181 | static const struct seq_operations softnet_seq_ops = { |
1da177e4 LT |
3182 | .start = softnet_seq_start, |
3183 | .next = softnet_seq_next, | |
3184 | .stop = softnet_seq_stop, | |
3185 | .show = softnet_seq_show, | |
3186 | }; | |
3187 | ||
3188 | static int softnet_seq_open(struct inode *inode, struct file *file) | |
3189 | { | |
3190 | return seq_open(file, &softnet_seq_ops); | |
3191 | } | |
3192 | ||
9a32144e | 3193 | static const struct file_operations softnet_seq_fops = { |
1da177e4 LT |
3194 | .owner = THIS_MODULE, |
3195 | .open = softnet_seq_open, | |
3196 | .read = seq_read, | |
3197 | .llseek = seq_lseek, | |
3198 | .release = seq_release, | |
3199 | }; | |
3200 | ||
0e1256ff SH |
3201 | static void *ptype_get_idx(loff_t pos) |
3202 | { | |
3203 | struct packet_type *pt = NULL; | |
3204 | loff_t i = 0; | |
3205 | int t; | |
3206 | ||
3207 | list_for_each_entry_rcu(pt, &ptype_all, list) { | |
3208 | if (i == pos) | |
3209 | return pt; | |
3210 | ++i; | |
3211 | } | |
3212 | ||
82d8a867 | 3213 | for (t = 0; t < PTYPE_HASH_SIZE; t++) { |
0e1256ff SH |
3214 | list_for_each_entry_rcu(pt, &ptype_base[t], list) { |
3215 | if (i == pos) | |
3216 | return pt; | |
3217 | ++i; | |
3218 | } | |
3219 | } | |
3220 | return NULL; | |
3221 | } | |
3222 | ||
3223 | static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) | |
72348a42 | 3224 | __acquires(RCU) |
0e1256ff SH |
3225 | { |
3226 | rcu_read_lock(); | |
3227 | return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN; | |
3228 | } | |
3229 | ||
3230 | static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3231 | { | |
3232 | struct packet_type *pt; | |
3233 | struct list_head *nxt; | |
3234 | int hash; | |
3235 | ||
3236 | ++*pos; | |
3237 | if (v == SEQ_START_TOKEN) | |
3238 | return ptype_get_idx(0); | |
3239 | ||
3240 | pt = v; | |
3241 | nxt = pt->list.next; | |
3242 | if (pt->type == htons(ETH_P_ALL)) { | |
3243 | if (nxt != &ptype_all) | |
3244 | goto found; | |
3245 | hash = 0; | |
3246 | nxt = ptype_base[0].next; | |
3247 | } else | |
82d8a867 | 3248 | hash = ntohs(pt->type) & PTYPE_HASH_MASK; |
0e1256ff SH |
3249 | |
3250 | while (nxt == &ptype_base[hash]) { | |
82d8a867 | 3251 | if (++hash >= PTYPE_HASH_SIZE) |
0e1256ff SH |
3252 | return NULL; |
3253 | nxt = ptype_base[hash].next; | |
3254 | } | |
3255 | found: | |
3256 | return list_entry(nxt, struct packet_type, list); | |
3257 | } | |
3258 | ||
3259 | static void ptype_seq_stop(struct seq_file *seq, void *v) | |
72348a42 | 3260 | __releases(RCU) |
0e1256ff SH |
3261 | { |
3262 | rcu_read_unlock(); | |
3263 | } | |
3264 | ||
0e1256ff SH |
3265 | static int ptype_seq_show(struct seq_file *seq, void *v) |
3266 | { | |
3267 | struct packet_type *pt = v; | |
3268 | ||
3269 | if (v == SEQ_START_TOKEN) | |
3270 | seq_puts(seq, "Type Device Function\n"); | |
c346dca1 | 3271 | else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) { |
0e1256ff SH |
3272 | if (pt->type == htons(ETH_P_ALL)) |
3273 | seq_puts(seq, "ALL "); | |
3274 | else | |
3275 | seq_printf(seq, "%04x", ntohs(pt->type)); | |
3276 | ||
908cd2da AD |
3277 | seq_printf(seq, " %-8s %pF\n", |
3278 | pt->dev ? pt->dev->name : "", pt->func); | |
0e1256ff SH |
3279 | } |
3280 | ||
3281 | return 0; | |
3282 | } | |
3283 | ||
3284 | static const struct seq_operations ptype_seq_ops = { | |
3285 | .start = ptype_seq_start, | |
3286 | .next = ptype_seq_next, | |
3287 | .stop = ptype_seq_stop, | |
3288 | .show = ptype_seq_show, | |
3289 | }; | |
3290 | ||
3291 | static int ptype_seq_open(struct inode *inode, struct file *file) | |
3292 | { | |
2feb27db PE |
3293 | return seq_open_net(inode, file, &ptype_seq_ops, |
3294 | sizeof(struct seq_net_private)); | |
0e1256ff SH |
3295 | } |
3296 | ||
3297 | static const struct file_operations ptype_seq_fops = { | |
3298 | .owner = THIS_MODULE, | |
3299 | .open = ptype_seq_open, | |
3300 | .read = seq_read, | |
3301 | .llseek = seq_lseek, | |
2feb27db | 3302 | .release = seq_release_net, |
0e1256ff SH |
3303 | }; |
3304 | ||
3305 | ||
4665079c | 3306 | static int __net_init dev_proc_net_init(struct net *net) |
1da177e4 LT |
3307 | { |
3308 | int rc = -ENOMEM; | |
3309 | ||
881d966b | 3310 | if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops)) |
1da177e4 | 3311 | goto out; |
881d966b | 3312 | if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops)) |
1da177e4 | 3313 | goto out_dev; |
881d966b | 3314 | if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops)) |
457c4cbc | 3315 | goto out_softnet; |
0e1256ff | 3316 | |
881d966b | 3317 | if (wext_proc_init(net)) |
457c4cbc | 3318 | goto out_ptype; |
1da177e4 LT |
3319 | rc = 0; |
3320 | out: | |
3321 | return rc; | |
457c4cbc | 3322 | out_ptype: |
881d966b | 3323 | proc_net_remove(net, "ptype"); |
1da177e4 | 3324 | out_softnet: |
881d966b | 3325 | proc_net_remove(net, "softnet_stat"); |
1da177e4 | 3326 | out_dev: |
881d966b | 3327 | proc_net_remove(net, "dev"); |
1da177e4 LT |
3328 | goto out; |
3329 | } | |
881d966b | 3330 | |
4665079c | 3331 | static void __net_exit dev_proc_net_exit(struct net *net) |
881d966b EB |
3332 | { |
3333 | wext_proc_exit(net); | |
3334 | ||
3335 | proc_net_remove(net, "ptype"); | |
3336 | proc_net_remove(net, "softnet_stat"); | |
3337 | proc_net_remove(net, "dev"); | |
3338 | } | |
3339 | ||
022cbae6 | 3340 | static struct pernet_operations __net_initdata dev_proc_ops = { |
881d966b EB |
3341 | .init = dev_proc_net_init, |
3342 | .exit = dev_proc_net_exit, | |
3343 | }; | |
3344 | ||
3345 | static int __init dev_proc_init(void) | |
3346 | { | |
3347 | return register_pernet_subsys(&dev_proc_ops); | |
3348 | } | |
1da177e4 LT |
3349 | #else |
3350 | #define dev_proc_init() 0 | |
3351 | #endif /* CONFIG_PROC_FS */ | |
3352 | ||
3353 | ||
3354 | /** | |
3355 | * netdev_set_master - set up master/slave pair | |
3356 | * @slave: slave device | |
3357 | * @master: new master device | |
3358 | * | |
3359 | * Changes the master device of the slave. Pass %NULL to break the | |
3360 | * bonding. The caller must hold the RTNL semaphore. On a failure | |
3361 | * a negative errno code is returned. On success the reference counts | |
3362 | * are adjusted, %RTM_NEWLINK is sent to the routing socket and the | |
3363 | * function returns zero. | |
3364 | */ | |
3365 | int netdev_set_master(struct net_device *slave, struct net_device *master) | |
3366 | { | |
3367 | struct net_device *old = slave->master; | |
3368 | ||
3369 | ASSERT_RTNL(); | |
3370 | ||
3371 | if (master) { | |
3372 | if (old) | |
3373 | return -EBUSY; | |
3374 | dev_hold(master); | |
3375 | } | |
3376 | ||
3377 | slave->master = master; | |
4ec93edb | 3378 | |
1da177e4 LT |
3379 | synchronize_net(); |
3380 | ||
3381 | if (old) | |
3382 | dev_put(old); | |
3383 | ||
3384 | if (master) | |
3385 | slave->flags |= IFF_SLAVE; | |
3386 | else | |
3387 | slave->flags &= ~IFF_SLAVE; | |
3388 | ||
3389 | rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE); | |
3390 | return 0; | |
3391 | } | |
d1b19dff | 3392 | EXPORT_SYMBOL(netdev_set_master); |
1da177e4 | 3393 | |
b6c40d68 PM |
3394 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
3395 | { | |
d314774c SH |
3396 | const struct net_device_ops *ops = dev->netdev_ops; |
3397 | ||
3398 | if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags) | |
3399 | ops->ndo_change_rx_flags(dev, flags); | |
b6c40d68 PM |
3400 | } |
3401 | ||
dad9b335 | 3402 | static int __dev_set_promiscuity(struct net_device *dev, int inc) |
1da177e4 LT |
3403 | { |
3404 | unsigned short old_flags = dev->flags; | |
8192b0c4 DH |
3405 | uid_t uid; |
3406 | gid_t gid; | |
1da177e4 | 3407 | |
24023451 PM |
3408 | ASSERT_RTNL(); |
3409 | ||
dad9b335 WC |
3410 | dev->flags |= IFF_PROMISC; |
3411 | dev->promiscuity += inc; | |
3412 | if (dev->promiscuity == 0) { | |
3413 | /* | |
3414 | * Avoid overflow. | |
3415 | * If inc causes overflow, untouch promisc and return error. | |
3416 | */ | |
3417 | if (inc < 0) | |
3418 | dev->flags &= ~IFF_PROMISC; | |
3419 | else { | |
3420 | dev->promiscuity -= inc; | |
3421 | printk(KERN_WARNING "%s: promiscuity touches roof, " | |
3422 | "set promiscuity failed, promiscuity feature " | |
3423 | "of device might be broken.\n", dev->name); | |
3424 | return -EOVERFLOW; | |
3425 | } | |
3426 | } | |
52609c0b | 3427 | if (dev->flags != old_flags) { |
1da177e4 LT |
3428 | printk(KERN_INFO "device %s %s promiscuous mode\n", |
3429 | dev->name, (dev->flags & IFF_PROMISC) ? "entered" : | |
4ec93edb | 3430 | "left"); |
8192b0c4 DH |
3431 | if (audit_enabled) { |
3432 | current_uid_gid(&uid, &gid); | |
7759db82 KHK |
3433 | audit_log(current->audit_context, GFP_ATOMIC, |
3434 | AUDIT_ANOM_PROMISCUOUS, | |
3435 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", | |
3436 | dev->name, (dev->flags & IFF_PROMISC), | |
3437 | (old_flags & IFF_PROMISC), | |
3438 | audit_get_loginuid(current), | |
8192b0c4 | 3439 | uid, gid, |
7759db82 | 3440 | audit_get_sessionid(current)); |
8192b0c4 | 3441 | } |
24023451 | 3442 | |
b6c40d68 | 3443 | dev_change_rx_flags(dev, IFF_PROMISC); |
1da177e4 | 3444 | } |
dad9b335 | 3445 | return 0; |
1da177e4 LT |
3446 | } |
3447 | ||
4417da66 PM |
3448 | /** |
3449 | * dev_set_promiscuity - update promiscuity count on a device | |
3450 | * @dev: device | |
3451 | * @inc: modifier | |
3452 | * | |
3453 | * Add or remove promiscuity from a device. While the count in the device | |
3454 | * remains above zero the interface remains promiscuous. Once it hits zero | |
3455 | * the device reverts back to normal filtering operation. A negative inc | |
3456 | * value is used to drop promiscuity on the device. | |
dad9b335 | 3457 | * Return 0 if successful or a negative errno code on error. |
4417da66 | 3458 | */ |
dad9b335 | 3459 | int dev_set_promiscuity(struct net_device *dev, int inc) |
4417da66 PM |
3460 | { |
3461 | unsigned short old_flags = dev->flags; | |
dad9b335 | 3462 | int err; |
4417da66 | 3463 | |
dad9b335 | 3464 | err = __dev_set_promiscuity(dev, inc); |
4b5a698e | 3465 | if (err < 0) |
dad9b335 | 3466 | return err; |
4417da66 PM |
3467 | if (dev->flags != old_flags) |
3468 | dev_set_rx_mode(dev); | |
dad9b335 | 3469 | return err; |
4417da66 | 3470 | } |
d1b19dff | 3471 | EXPORT_SYMBOL(dev_set_promiscuity); |
4417da66 | 3472 | |
1da177e4 LT |
3473 | /** |
3474 | * dev_set_allmulti - update allmulti count on a device | |
3475 | * @dev: device | |
3476 | * @inc: modifier | |
3477 | * | |
3478 | * Add or remove reception of all multicast frames to a device. While the | |
3479 | * count in the device remains above zero the interface remains listening | |
3480 | * to all interfaces. Once it hits zero the device reverts back to normal | |
3481 | * filtering operation. A negative @inc value is used to drop the counter | |
3482 | * when releasing a resource needing all multicasts. | |
dad9b335 | 3483 | * Return 0 if successful or a negative errno code on error. |
1da177e4 LT |
3484 | */ |
3485 | ||
dad9b335 | 3486 | int dev_set_allmulti(struct net_device *dev, int inc) |
1da177e4 LT |
3487 | { |
3488 | unsigned short old_flags = dev->flags; | |
3489 | ||
24023451 PM |
3490 | ASSERT_RTNL(); |
3491 | ||
1da177e4 | 3492 | dev->flags |= IFF_ALLMULTI; |
dad9b335 WC |
3493 | dev->allmulti += inc; |
3494 | if (dev->allmulti == 0) { | |
3495 | /* | |
3496 | * Avoid overflow. | |
3497 | * If inc causes overflow, untouch allmulti and return error. | |
3498 | */ | |
3499 | if (inc < 0) | |
3500 | dev->flags &= ~IFF_ALLMULTI; | |
3501 | else { | |
3502 | dev->allmulti -= inc; | |
3503 | printk(KERN_WARNING "%s: allmulti touches roof, " | |
3504 | "set allmulti failed, allmulti feature of " | |
3505 | "device might be broken.\n", dev->name); | |
3506 | return -EOVERFLOW; | |
3507 | } | |
3508 | } | |
24023451 | 3509 | if (dev->flags ^ old_flags) { |
b6c40d68 | 3510 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
4417da66 | 3511 | dev_set_rx_mode(dev); |
24023451 | 3512 | } |
dad9b335 | 3513 | return 0; |
4417da66 | 3514 | } |
d1b19dff | 3515 | EXPORT_SYMBOL(dev_set_allmulti); |
4417da66 PM |
3516 | |
3517 | /* | |
3518 | * Upload unicast and multicast address lists to device and | |
3519 | * configure RX filtering. When the device doesn't support unicast | |
53ccaae1 | 3520 | * filtering it is put in promiscuous mode while unicast addresses |
4417da66 PM |
3521 | * are present. |
3522 | */ | |
3523 | void __dev_set_rx_mode(struct net_device *dev) | |
3524 | { | |
d314774c SH |
3525 | const struct net_device_ops *ops = dev->netdev_ops; |
3526 | ||
4417da66 PM |
3527 | /* dev_open will call this function so the list will stay sane. */ |
3528 | if (!(dev->flags&IFF_UP)) | |
3529 | return; | |
3530 | ||
3531 | if (!netif_device_present(dev)) | |
40b77c94 | 3532 | return; |
4417da66 | 3533 | |
d314774c SH |
3534 | if (ops->ndo_set_rx_mode) |
3535 | ops->ndo_set_rx_mode(dev); | |
4417da66 PM |
3536 | else { |
3537 | /* Unicast addresses changes may only happen under the rtnl, | |
3538 | * therefore calling __dev_set_promiscuity here is safe. | |
3539 | */ | |
31278e71 | 3540 | if (dev->uc.count > 0 && !dev->uc_promisc) { |
4417da66 PM |
3541 | __dev_set_promiscuity(dev, 1); |
3542 | dev->uc_promisc = 1; | |
31278e71 | 3543 | } else if (dev->uc.count == 0 && dev->uc_promisc) { |
4417da66 PM |
3544 | __dev_set_promiscuity(dev, -1); |
3545 | dev->uc_promisc = 0; | |
3546 | } | |
3547 | ||
d314774c SH |
3548 | if (ops->ndo_set_multicast_list) |
3549 | ops->ndo_set_multicast_list(dev); | |
4417da66 PM |
3550 | } |
3551 | } | |
3552 | ||
3553 | void dev_set_rx_mode(struct net_device *dev) | |
3554 | { | |
b9e40857 | 3555 | netif_addr_lock_bh(dev); |
4417da66 | 3556 | __dev_set_rx_mode(dev); |
b9e40857 | 3557 | netif_addr_unlock_bh(dev); |
1da177e4 LT |
3558 | } |
3559 | ||
f001fde5 JP |
3560 | /* hw addresses list handling functions */ |
3561 | ||
31278e71 JP |
3562 | static int __hw_addr_add(struct netdev_hw_addr_list *list, unsigned char *addr, |
3563 | int addr_len, unsigned char addr_type) | |
f001fde5 JP |
3564 | { |
3565 | struct netdev_hw_addr *ha; | |
3566 | int alloc_size; | |
3567 | ||
3568 | if (addr_len > MAX_ADDR_LEN) | |
3569 | return -EINVAL; | |
3570 | ||
31278e71 | 3571 | list_for_each_entry(ha, &list->list, list) { |
ccffad25 JP |
3572 | if (!memcmp(ha->addr, addr, addr_len) && |
3573 | ha->type == addr_type) { | |
3574 | ha->refcount++; | |
3575 | return 0; | |
3576 | } | |
3577 | } | |
3578 | ||
3579 | ||
f001fde5 JP |
3580 | alloc_size = sizeof(*ha); |
3581 | if (alloc_size < L1_CACHE_BYTES) | |
3582 | alloc_size = L1_CACHE_BYTES; | |
3583 | ha = kmalloc(alloc_size, GFP_ATOMIC); | |
3584 | if (!ha) | |
3585 | return -ENOMEM; | |
3586 | memcpy(ha->addr, addr, addr_len); | |
3587 | ha->type = addr_type; | |
ccffad25 JP |
3588 | ha->refcount = 1; |
3589 | ha->synced = false; | |
31278e71 JP |
3590 | list_add_tail_rcu(&ha->list, &list->list); |
3591 | list->count++; | |
f001fde5 JP |
3592 | return 0; |
3593 | } | |
3594 | ||
3595 | static void ha_rcu_free(struct rcu_head *head) | |
3596 | { | |
3597 | struct netdev_hw_addr *ha; | |
3598 | ||
3599 | ha = container_of(head, struct netdev_hw_addr, rcu_head); | |
3600 | kfree(ha); | |
3601 | } | |
3602 | ||
31278e71 JP |
3603 | static int __hw_addr_del(struct netdev_hw_addr_list *list, unsigned char *addr, |
3604 | int addr_len, unsigned char addr_type) | |
f001fde5 JP |
3605 | { |
3606 | struct netdev_hw_addr *ha; | |
f001fde5 | 3607 | |
31278e71 | 3608 | list_for_each_entry(ha, &list->list, list) { |
ccffad25 | 3609 | if (!memcmp(ha->addr, addr, addr_len) && |
f001fde5 | 3610 | (ha->type == addr_type || !addr_type)) { |
ccffad25 JP |
3611 | if (--ha->refcount) |
3612 | return 0; | |
f001fde5 JP |
3613 | list_del_rcu(&ha->list); |
3614 | call_rcu(&ha->rcu_head, ha_rcu_free); | |
31278e71 | 3615 | list->count--; |
f001fde5 JP |
3616 | return 0; |
3617 | } | |
3618 | } | |
3619 | return -ENOENT; | |
3620 | } | |
3621 | ||
31278e71 JP |
3622 | static int __hw_addr_add_multiple(struct netdev_hw_addr_list *to_list, |
3623 | struct netdev_hw_addr_list *from_list, | |
3624 | int addr_len, | |
ccffad25 | 3625 | unsigned char addr_type) |
f001fde5 JP |
3626 | { |
3627 | int err; | |
3628 | struct netdev_hw_addr *ha, *ha2; | |
3629 | unsigned char type; | |
3630 | ||
31278e71 | 3631 | list_for_each_entry(ha, &from_list->list, list) { |
f001fde5 | 3632 | type = addr_type ? addr_type : ha->type; |
31278e71 | 3633 | err = __hw_addr_add(to_list, ha->addr, addr_len, type); |
f001fde5 JP |
3634 | if (err) |
3635 | goto unroll; | |
3636 | } | |
3637 | return 0; | |
3638 | ||
3639 | unroll: | |
31278e71 | 3640 | list_for_each_entry(ha2, &from_list->list, list) { |
f001fde5 JP |
3641 | if (ha2 == ha) |
3642 | break; | |
3643 | type = addr_type ? addr_type : ha2->type; | |
31278e71 | 3644 | __hw_addr_del(to_list, ha2->addr, addr_len, type); |
f001fde5 JP |
3645 | } |
3646 | return err; | |
3647 | } | |
3648 | ||
31278e71 JP |
3649 | static void __hw_addr_del_multiple(struct netdev_hw_addr_list *to_list, |
3650 | struct netdev_hw_addr_list *from_list, | |
3651 | int addr_len, | |
ccffad25 | 3652 | unsigned char addr_type) |
f001fde5 JP |
3653 | { |
3654 | struct netdev_hw_addr *ha; | |
3655 | unsigned char type; | |
3656 | ||
31278e71 | 3657 | list_for_each_entry(ha, &from_list->list, list) { |
f001fde5 | 3658 | type = addr_type ? addr_type : ha->type; |
31278e71 | 3659 | __hw_addr_del(to_list, ha->addr, addr_len, addr_type); |
ccffad25 JP |
3660 | } |
3661 | } | |
3662 | ||
31278e71 JP |
3663 | static int __hw_addr_sync(struct netdev_hw_addr_list *to_list, |
3664 | struct netdev_hw_addr_list *from_list, | |
ccffad25 JP |
3665 | int addr_len) |
3666 | { | |
3667 | int err = 0; | |
3668 | struct netdev_hw_addr *ha, *tmp; | |
3669 | ||
31278e71 | 3670 | list_for_each_entry_safe(ha, tmp, &from_list->list, list) { |
ccffad25 | 3671 | if (!ha->synced) { |
31278e71 | 3672 | err = __hw_addr_add(to_list, ha->addr, |
ccffad25 JP |
3673 | addr_len, ha->type); |
3674 | if (err) | |
3675 | break; | |
3676 | ha->synced = true; | |
3677 | ha->refcount++; | |
3678 | } else if (ha->refcount == 1) { | |
31278e71 JP |
3679 | __hw_addr_del(to_list, ha->addr, addr_len, ha->type); |
3680 | __hw_addr_del(from_list, ha->addr, addr_len, ha->type); | |
ccffad25 | 3681 | } |
f001fde5 | 3682 | } |
ccffad25 | 3683 | return err; |
f001fde5 JP |
3684 | } |
3685 | ||
31278e71 JP |
3686 | static void __hw_addr_unsync(struct netdev_hw_addr_list *to_list, |
3687 | struct netdev_hw_addr_list *from_list, | |
ccffad25 JP |
3688 | int addr_len) |
3689 | { | |
3690 | struct netdev_hw_addr *ha, *tmp; | |
3691 | ||
31278e71 | 3692 | list_for_each_entry_safe(ha, tmp, &from_list->list, list) { |
ccffad25 | 3693 | if (ha->synced) { |
31278e71 | 3694 | __hw_addr_del(to_list, ha->addr, |
ccffad25 JP |
3695 | addr_len, ha->type); |
3696 | ha->synced = false; | |
31278e71 | 3697 | __hw_addr_del(from_list, ha->addr, |
ccffad25 JP |
3698 | addr_len, ha->type); |
3699 | } | |
3700 | } | |
3701 | } | |
3702 | ||
31278e71 | 3703 | static void __hw_addr_flush(struct netdev_hw_addr_list *list) |
f001fde5 JP |
3704 | { |
3705 | struct netdev_hw_addr *ha, *tmp; | |
3706 | ||
31278e71 | 3707 | list_for_each_entry_safe(ha, tmp, &list->list, list) { |
f001fde5 JP |
3708 | list_del_rcu(&ha->list); |
3709 | call_rcu(&ha->rcu_head, ha_rcu_free); | |
3710 | } | |
31278e71 JP |
3711 | list->count = 0; |
3712 | } | |
3713 | ||
3714 | static void __hw_addr_init(struct netdev_hw_addr_list *list) | |
3715 | { | |
3716 | INIT_LIST_HEAD(&list->list); | |
3717 | list->count = 0; | |
f001fde5 JP |
3718 | } |
3719 | ||
3720 | /* Device addresses handling functions */ | |
3721 | ||
3722 | static void dev_addr_flush(struct net_device *dev) | |
3723 | { | |
3724 | /* rtnl_mutex must be held here */ | |
3725 | ||
31278e71 | 3726 | __hw_addr_flush(&dev->dev_addrs); |
f001fde5 JP |
3727 | dev->dev_addr = NULL; |
3728 | } | |
3729 | ||
3730 | static int dev_addr_init(struct net_device *dev) | |
3731 | { | |
3732 | unsigned char addr[MAX_ADDR_LEN]; | |
3733 | struct netdev_hw_addr *ha; | |
3734 | int err; | |
3735 | ||
3736 | /* rtnl_mutex must be held here */ | |
3737 | ||
31278e71 | 3738 | __hw_addr_init(&dev->dev_addrs); |
0c27922e | 3739 | memset(addr, 0, sizeof(addr)); |
31278e71 | 3740 | err = __hw_addr_add(&dev->dev_addrs, addr, sizeof(addr), |
f001fde5 JP |
3741 | NETDEV_HW_ADDR_T_LAN); |
3742 | if (!err) { | |
3743 | /* | |
3744 | * Get the first (previously created) address from the list | |
3745 | * and set dev_addr pointer to this location. | |
3746 | */ | |
31278e71 | 3747 | ha = list_first_entry(&dev->dev_addrs.list, |
f001fde5 JP |
3748 | struct netdev_hw_addr, list); |
3749 | dev->dev_addr = ha->addr; | |
3750 | } | |
3751 | return err; | |
3752 | } | |
3753 | ||
3754 | /** | |
3755 | * dev_addr_add - Add a device address | |
3756 | * @dev: device | |
3757 | * @addr: address to add | |
3758 | * @addr_type: address type | |
3759 | * | |
3760 | * Add a device address to the device or increase the reference count if | |
3761 | * it already exists. | |
3762 | * | |
3763 | * The caller must hold the rtnl_mutex. | |
3764 | */ | |
3765 | int dev_addr_add(struct net_device *dev, unsigned char *addr, | |
3766 | unsigned char addr_type) | |
3767 | { | |
3768 | int err; | |
3769 | ||
3770 | ASSERT_RTNL(); | |
3771 | ||
31278e71 | 3772 | err = __hw_addr_add(&dev->dev_addrs, addr, dev->addr_len, addr_type); |
f001fde5 JP |
3773 | if (!err) |
3774 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
3775 | return err; | |
3776 | } | |
3777 | EXPORT_SYMBOL(dev_addr_add); | |
3778 | ||
3779 | /** | |
3780 | * dev_addr_del - Release a device address. | |
3781 | * @dev: device | |
3782 | * @addr: address to delete | |
3783 | * @addr_type: address type | |
3784 | * | |
3785 | * Release reference to a device address and remove it from the device | |
3786 | * if the reference count drops to zero. | |
3787 | * | |
3788 | * The caller must hold the rtnl_mutex. | |
3789 | */ | |
3790 | int dev_addr_del(struct net_device *dev, unsigned char *addr, | |
3791 | unsigned char addr_type) | |
3792 | { | |
3793 | int err; | |
ccffad25 | 3794 | struct netdev_hw_addr *ha; |
f001fde5 JP |
3795 | |
3796 | ASSERT_RTNL(); | |
3797 | ||
ccffad25 JP |
3798 | /* |
3799 | * We can not remove the first address from the list because | |
3800 | * dev->dev_addr points to that. | |
3801 | */ | |
31278e71 JP |
3802 | ha = list_first_entry(&dev->dev_addrs.list, |
3803 | struct netdev_hw_addr, list); | |
ccffad25 JP |
3804 | if (ha->addr == dev->dev_addr && ha->refcount == 1) |
3805 | return -ENOENT; | |
3806 | ||
31278e71 | 3807 | err = __hw_addr_del(&dev->dev_addrs, addr, dev->addr_len, |
ccffad25 | 3808 | addr_type); |
f001fde5 JP |
3809 | if (!err) |
3810 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
3811 | return err; | |
3812 | } | |
3813 | EXPORT_SYMBOL(dev_addr_del); | |
3814 | ||
3815 | /** | |
3816 | * dev_addr_add_multiple - Add device addresses from another device | |
3817 | * @to_dev: device to which addresses will be added | |
3818 | * @from_dev: device from which addresses will be added | |
3819 | * @addr_type: address type - 0 means type will be used from from_dev | |
3820 | * | |
3821 | * Add device addresses of the one device to another. | |
3822 | ** | |
3823 | * The caller must hold the rtnl_mutex. | |
3824 | */ | |
3825 | int dev_addr_add_multiple(struct net_device *to_dev, | |
3826 | struct net_device *from_dev, | |
3827 | unsigned char addr_type) | |
3828 | { | |
3829 | int err; | |
3830 | ||
3831 | ASSERT_RTNL(); | |
3832 | ||
3833 | if (from_dev->addr_len != to_dev->addr_len) | |
3834 | return -EINVAL; | |
31278e71 | 3835 | err = __hw_addr_add_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs, |
ccffad25 | 3836 | to_dev->addr_len, addr_type); |
f001fde5 JP |
3837 | if (!err) |
3838 | call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev); | |
3839 | return err; | |
3840 | } | |
3841 | EXPORT_SYMBOL(dev_addr_add_multiple); | |
3842 | ||
3843 | /** | |
3844 | * dev_addr_del_multiple - Delete device addresses by another device | |
3845 | * @to_dev: device where the addresses will be deleted | |
3846 | * @from_dev: device by which addresses the addresses will be deleted | |
3847 | * @addr_type: address type - 0 means type will used from from_dev | |
3848 | * | |
3849 | * Deletes addresses in to device by the list of addresses in from device. | |
3850 | * | |
3851 | * The caller must hold the rtnl_mutex. | |
3852 | */ | |
3853 | int dev_addr_del_multiple(struct net_device *to_dev, | |
3854 | struct net_device *from_dev, | |
3855 | unsigned char addr_type) | |
3856 | { | |
3857 | ASSERT_RTNL(); | |
3858 | ||
3859 | if (from_dev->addr_len != to_dev->addr_len) | |
3860 | return -EINVAL; | |
31278e71 | 3861 | __hw_addr_del_multiple(&to_dev->dev_addrs, &from_dev->dev_addrs, |
ccffad25 | 3862 | to_dev->addr_len, addr_type); |
f001fde5 JP |
3863 | call_netdevice_notifiers(NETDEV_CHANGEADDR, to_dev); |
3864 | return 0; | |
3865 | } | |
3866 | EXPORT_SYMBOL(dev_addr_del_multiple); | |
3867 | ||
31278e71 | 3868 | /* multicast addresses handling functions */ |
f001fde5 | 3869 | |
61cbc2fc PM |
3870 | int __dev_addr_delete(struct dev_addr_list **list, int *count, |
3871 | void *addr, int alen, int glbl) | |
bf742482 PM |
3872 | { |
3873 | struct dev_addr_list *da; | |
3874 | ||
3875 | for (; (da = *list) != NULL; list = &da->next) { | |
3876 | if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 && | |
3877 | alen == da->da_addrlen) { | |
3878 | if (glbl) { | |
3879 | int old_glbl = da->da_gusers; | |
3880 | da->da_gusers = 0; | |
3881 | if (old_glbl == 0) | |
3882 | break; | |
3883 | } | |
3884 | if (--da->da_users) | |
3885 | return 0; | |
3886 | ||
3887 | *list = da->next; | |
3888 | kfree(da); | |
61cbc2fc | 3889 | (*count)--; |
bf742482 PM |
3890 | return 0; |
3891 | } | |
3892 | } | |
3893 | return -ENOENT; | |
3894 | } | |
3895 | ||
61cbc2fc PM |
3896 | int __dev_addr_add(struct dev_addr_list **list, int *count, |
3897 | void *addr, int alen, int glbl) | |
bf742482 PM |
3898 | { |
3899 | struct dev_addr_list *da; | |
3900 | ||
3901 | for (da = *list; da != NULL; da = da->next) { | |
3902 | if (memcmp(da->da_addr, addr, da->da_addrlen) == 0 && | |
3903 | da->da_addrlen == alen) { | |
3904 | if (glbl) { | |
3905 | int old_glbl = da->da_gusers; | |
3906 | da->da_gusers = 1; | |
3907 | if (old_glbl) | |
3908 | return 0; | |
3909 | } | |
3910 | da->da_users++; | |
3911 | return 0; | |
3912 | } | |
3913 | } | |
3914 | ||
12aa343a | 3915 | da = kzalloc(sizeof(*da), GFP_ATOMIC); |
bf742482 PM |
3916 | if (da == NULL) |
3917 | return -ENOMEM; | |
3918 | memcpy(da->da_addr, addr, alen); | |
3919 | da->da_addrlen = alen; | |
3920 | da->da_users = 1; | |
3921 | da->da_gusers = glbl ? 1 : 0; | |
3922 | da->next = *list; | |
3923 | *list = da; | |
61cbc2fc | 3924 | (*count)++; |
bf742482 PM |
3925 | return 0; |
3926 | } | |
3927 | ||
4417da66 PM |
3928 | /** |
3929 | * dev_unicast_delete - Release secondary unicast address. | |
3930 | * @dev: device | |
0ed72ec4 | 3931 | * @addr: address to delete |
4417da66 PM |
3932 | * |
3933 | * Release reference to a secondary unicast address and remove it | |
0ed72ec4 | 3934 | * from the device if the reference count drops to zero. |
4417da66 PM |
3935 | * |
3936 | * The caller must hold the rtnl_mutex. | |
3937 | */ | |
ccffad25 | 3938 | int dev_unicast_delete(struct net_device *dev, void *addr) |
4417da66 PM |
3939 | { |
3940 | int err; | |
3941 | ||
3942 | ASSERT_RTNL(); | |
3943 | ||
a6ac65db | 3944 | netif_addr_lock_bh(dev); |
31278e71 JP |
3945 | err = __hw_addr_del(&dev->uc, addr, dev->addr_len, |
3946 | NETDEV_HW_ADDR_T_UNICAST); | |
61cbc2fc | 3947 | if (!err) |
4417da66 | 3948 | __dev_set_rx_mode(dev); |
a6ac65db | 3949 | netif_addr_unlock_bh(dev); |
4417da66 PM |
3950 | return err; |
3951 | } | |
3952 | EXPORT_SYMBOL(dev_unicast_delete); | |
3953 | ||
3954 | /** | |
3955 | * dev_unicast_add - add a secondary unicast address | |
3956 | * @dev: device | |
5dbaec5d | 3957 | * @addr: address to add |
4417da66 PM |
3958 | * |
3959 | * Add a secondary unicast address to the device or increase | |
3960 | * the reference count if it already exists. | |
3961 | * | |
3962 | * The caller must hold the rtnl_mutex. | |
3963 | */ | |
ccffad25 | 3964 | int dev_unicast_add(struct net_device *dev, void *addr) |
4417da66 PM |
3965 | { |
3966 | int err; | |
3967 | ||
3968 | ASSERT_RTNL(); | |
3969 | ||
a6ac65db | 3970 | netif_addr_lock_bh(dev); |
31278e71 JP |
3971 | err = __hw_addr_add(&dev->uc, addr, dev->addr_len, |
3972 | NETDEV_HW_ADDR_T_UNICAST); | |
61cbc2fc | 3973 | if (!err) |
4417da66 | 3974 | __dev_set_rx_mode(dev); |
a6ac65db | 3975 | netif_addr_unlock_bh(dev); |
4417da66 PM |
3976 | return err; |
3977 | } | |
3978 | EXPORT_SYMBOL(dev_unicast_add); | |
3979 | ||
e83a2ea8 CL |
3980 | int __dev_addr_sync(struct dev_addr_list **to, int *to_count, |
3981 | struct dev_addr_list **from, int *from_count) | |
3982 | { | |
3983 | struct dev_addr_list *da, *next; | |
3984 | int err = 0; | |
3985 | ||
3986 | da = *from; | |
3987 | while (da != NULL) { | |
3988 | next = da->next; | |
3989 | if (!da->da_synced) { | |
3990 | err = __dev_addr_add(to, to_count, | |
3991 | da->da_addr, da->da_addrlen, 0); | |
3992 | if (err < 0) | |
3993 | break; | |
3994 | da->da_synced = 1; | |
3995 | da->da_users++; | |
3996 | } else if (da->da_users == 1) { | |
3997 | __dev_addr_delete(to, to_count, | |
3998 | da->da_addr, da->da_addrlen, 0); | |
3999 | __dev_addr_delete(from, from_count, | |
4000 | da->da_addr, da->da_addrlen, 0); | |
4001 | } | |
4002 | da = next; | |
4003 | } | |
4004 | return err; | |
4005 | } | |
c4029083 | 4006 | EXPORT_SYMBOL_GPL(__dev_addr_sync); |
e83a2ea8 CL |
4007 | |
4008 | void __dev_addr_unsync(struct dev_addr_list **to, int *to_count, | |
4009 | struct dev_addr_list **from, int *from_count) | |
4010 | { | |
4011 | struct dev_addr_list *da, *next; | |
4012 | ||
4013 | da = *from; | |
4014 | while (da != NULL) { | |
4015 | next = da->next; | |
4016 | if (da->da_synced) { | |
4017 | __dev_addr_delete(to, to_count, | |
4018 | da->da_addr, da->da_addrlen, 0); | |
4019 | da->da_synced = 0; | |
4020 | __dev_addr_delete(from, from_count, | |
4021 | da->da_addr, da->da_addrlen, 0); | |
4022 | } | |
4023 | da = next; | |
4024 | } | |
4025 | } | |
c4029083 | 4026 | EXPORT_SYMBOL_GPL(__dev_addr_unsync); |
e83a2ea8 CL |
4027 | |
4028 | /** | |
4029 | * dev_unicast_sync - Synchronize device's unicast list to another device | |
4030 | * @to: destination device | |
4031 | * @from: source device | |
4032 | * | |
4033 | * Add newly added addresses to the destination device and release | |
a6ac65db JP |
4034 | * addresses that have no users left. The source device must be |
4035 | * locked by netif_tx_lock_bh. | |
e83a2ea8 CL |
4036 | * |
4037 | * This function is intended to be called from the dev->set_rx_mode | |
4038 | * function of layered software devices. | |
4039 | */ | |
4040 | int dev_unicast_sync(struct net_device *to, struct net_device *from) | |
4041 | { | |
4042 | int err = 0; | |
4043 | ||
ccffad25 JP |
4044 | if (to->addr_len != from->addr_len) |
4045 | return -EINVAL; | |
4046 | ||
a6ac65db | 4047 | netif_addr_lock_bh(to); |
31278e71 | 4048 | err = __hw_addr_sync(&to->uc, &from->uc, to->addr_len); |
e83a2ea8 CL |
4049 | if (!err) |
4050 | __dev_set_rx_mode(to); | |
a6ac65db | 4051 | netif_addr_unlock_bh(to); |
e83a2ea8 CL |
4052 | return err; |
4053 | } | |
4054 | EXPORT_SYMBOL(dev_unicast_sync); | |
4055 | ||
4056 | /** | |
bc2cda1e | 4057 | * dev_unicast_unsync - Remove synchronized addresses from the destination device |
e83a2ea8 CL |
4058 | * @to: destination device |
4059 | * @from: source device | |
4060 | * | |
4061 | * Remove all addresses that were added to the destination device by | |
4062 | * dev_unicast_sync(). This function is intended to be called from the | |
4063 | * dev->stop function of layered software devices. | |
4064 | */ | |
4065 | void dev_unicast_unsync(struct net_device *to, struct net_device *from) | |
4066 | { | |
ccffad25 JP |
4067 | if (to->addr_len != from->addr_len) |
4068 | return; | |
e83a2ea8 | 4069 | |
a6ac65db JP |
4070 | netif_addr_lock_bh(from); |
4071 | netif_addr_lock(to); | |
31278e71 | 4072 | __hw_addr_unsync(&to->uc, &from->uc, to->addr_len); |
ccffad25 | 4073 | __dev_set_rx_mode(to); |
a6ac65db JP |
4074 | netif_addr_unlock(to); |
4075 | netif_addr_unlock_bh(from); | |
e83a2ea8 CL |
4076 | } |
4077 | EXPORT_SYMBOL(dev_unicast_unsync); | |
4078 | ||
ccffad25 JP |
4079 | static void dev_unicast_flush(struct net_device *dev) |
4080 | { | |
a6ac65db | 4081 | netif_addr_lock_bh(dev); |
31278e71 | 4082 | __hw_addr_flush(&dev->uc); |
a6ac65db | 4083 | netif_addr_unlock_bh(dev); |
ccffad25 JP |
4084 | } |
4085 | ||
4086 | static void dev_unicast_init(struct net_device *dev) | |
4087 | { | |
31278e71 | 4088 | __hw_addr_init(&dev->uc); |
ccffad25 JP |
4089 | } |
4090 | ||
4091 | ||
12972621 DC |
4092 | static void __dev_addr_discard(struct dev_addr_list **list) |
4093 | { | |
4094 | struct dev_addr_list *tmp; | |
4095 | ||
4096 | while (*list != NULL) { | |
4097 | tmp = *list; | |
4098 | *list = tmp->next; | |
4099 | if (tmp->da_users > tmp->da_gusers) | |
4100 | printk("__dev_addr_discard: address leakage! " | |
4101 | "da_users=%d\n", tmp->da_users); | |
4102 | kfree(tmp); | |
4103 | } | |
4104 | } | |
4105 | ||
26cc2522 | 4106 | static void dev_addr_discard(struct net_device *dev) |
4417da66 | 4107 | { |
b9e40857 | 4108 | netif_addr_lock_bh(dev); |
26cc2522 | 4109 | |
456ad75c DC |
4110 | __dev_addr_discard(&dev->mc_list); |
4111 | dev->mc_count = 0; | |
26cc2522 | 4112 | |
b9e40857 | 4113 | netif_addr_unlock_bh(dev); |
456ad75c DC |
4114 | } |
4115 | ||
f0db275a SH |
4116 | /** |
4117 | * dev_get_flags - get flags reported to userspace | |
4118 | * @dev: device | |
4119 | * | |
4120 | * Get the combination of flag bits exported through APIs to userspace. | |
4121 | */ | |
1da177e4 LT |
4122 | unsigned dev_get_flags(const struct net_device *dev) |
4123 | { | |
4124 | unsigned flags; | |
4125 | ||
4126 | flags = (dev->flags & ~(IFF_PROMISC | | |
4127 | IFF_ALLMULTI | | |
b00055aa SR |
4128 | IFF_RUNNING | |
4129 | IFF_LOWER_UP | | |
4130 | IFF_DORMANT)) | | |
1da177e4 LT |
4131 | (dev->gflags & (IFF_PROMISC | |
4132 | IFF_ALLMULTI)); | |
4133 | ||
b00055aa SR |
4134 | if (netif_running(dev)) { |
4135 | if (netif_oper_up(dev)) | |
4136 | flags |= IFF_RUNNING; | |
4137 | if (netif_carrier_ok(dev)) | |
4138 | flags |= IFF_LOWER_UP; | |
4139 | if (netif_dormant(dev)) | |
4140 | flags |= IFF_DORMANT; | |
4141 | } | |
1da177e4 LT |
4142 | |
4143 | return flags; | |
4144 | } | |
d1b19dff | 4145 | EXPORT_SYMBOL(dev_get_flags); |
1da177e4 | 4146 | |
f0db275a SH |
4147 | /** |
4148 | * dev_change_flags - change device settings | |
4149 | * @dev: device | |
4150 | * @flags: device state flags | |
4151 | * | |
4152 | * Change settings on device based state flags. The flags are | |
4153 | * in the userspace exported format. | |
4154 | */ | |
1da177e4 LT |
4155 | int dev_change_flags(struct net_device *dev, unsigned flags) |
4156 | { | |
7c355f53 | 4157 | int ret, changes; |
1da177e4 LT |
4158 | int old_flags = dev->flags; |
4159 | ||
24023451 PM |
4160 | ASSERT_RTNL(); |
4161 | ||
1da177e4 LT |
4162 | /* |
4163 | * Set the flags on our device. | |
4164 | */ | |
4165 | ||
4166 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
4167 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
4168 | IFF_AUTOMEDIA)) | | |
4169 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
4170 | IFF_ALLMULTI)); | |
4171 | ||
4172 | /* | |
4173 | * Load in the correct multicast list now the flags have changed. | |
4174 | */ | |
4175 | ||
b6c40d68 PM |
4176 | if ((old_flags ^ flags) & IFF_MULTICAST) |
4177 | dev_change_rx_flags(dev, IFF_MULTICAST); | |
24023451 | 4178 | |
4417da66 | 4179 | dev_set_rx_mode(dev); |
1da177e4 LT |
4180 | |
4181 | /* | |
4182 | * Have we downed the interface. We handle IFF_UP ourselves | |
4183 | * according to user attempts to set it, rather than blindly | |
4184 | * setting it. | |
4185 | */ | |
4186 | ||
4187 | ret = 0; | |
4188 | if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */ | |
4189 | ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev); | |
4190 | ||
4191 | if (!ret) | |
4417da66 | 4192 | dev_set_rx_mode(dev); |
1da177e4 LT |
4193 | } |
4194 | ||
4195 | if (dev->flags & IFF_UP && | |
d1b19dff | 4196 | ((old_flags ^ dev->flags) & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | |
1da177e4 | 4197 | IFF_VOLATILE))) |
056925ab | 4198 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
1da177e4 LT |
4199 | |
4200 | if ((flags ^ dev->gflags) & IFF_PROMISC) { | |
d1b19dff ED |
4201 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
4202 | ||
1da177e4 LT |
4203 | dev->gflags ^= IFF_PROMISC; |
4204 | dev_set_promiscuity(dev, inc); | |
4205 | } | |
4206 | ||
4207 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
4208 | is important. Some (broken) drivers set IFF_PROMISC, when | |
4209 | IFF_ALLMULTI is requested not asking us and not reporting. | |
4210 | */ | |
4211 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
d1b19dff ED |
4212 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
4213 | ||
1da177e4 LT |
4214 | dev->gflags ^= IFF_ALLMULTI; |
4215 | dev_set_allmulti(dev, inc); | |
4216 | } | |
4217 | ||
7c355f53 TG |
4218 | /* Exclude state transition flags, already notified */ |
4219 | changes = (old_flags ^ dev->flags) & ~(IFF_UP | IFF_RUNNING); | |
4220 | if (changes) | |
4221 | rtmsg_ifinfo(RTM_NEWLINK, dev, changes); | |
1da177e4 LT |
4222 | |
4223 | return ret; | |
4224 | } | |
d1b19dff | 4225 | EXPORT_SYMBOL(dev_change_flags); |
1da177e4 | 4226 | |
f0db275a SH |
4227 | /** |
4228 | * dev_set_mtu - Change maximum transfer unit | |
4229 | * @dev: device | |
4230 | * @new_mtu: new transfer unit | |
4231 | * | |
4232 | * Change the maximum transfer size of the network device. | |
4233 | */ | |
1da177e4 LT |
4234 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
4235 | { | |
d314774c | 4236 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
4237 | int err; |
4238 | ||
4239 | if (new_mtu == dev->mtu) | |
4240 | return 0; | |
4241 | ||
4242 | /* MTU must be positive. */ | |
4243 | if (new_mtu < 0) | |
4244 | return -EINVAL; | |
4245 | ||
4246 | if (!netif_device_present(dev)) | |
4247 | return -ENODEV; | |
4248 | ||
4249 | err = 0; | |
d314774c SH |
4250 | if (ops->ndo_change_mtu) |
4251 | err = ops->ndo_change_mtu(dev, new_mtu); | |
1da177e4 LT |
4252 | else |
4253 | dev->mtu = new_mtu; | |
d314774c | 4254 | |
1da177e4 | 4255 | if (!err && dev->flags & IFF_UP) |
056925ab | 4256 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); |
1da177e4 LT |
4257 | return err; |
4258 | } | |
d1b19dff | 4259 | EXPORT_SYMBOL(dev_set_mtu); |
1da177e4 | 4260 | |
f0db275a SH |
4261 | /** |
4262 | * dev_set_mac_address - Change Media Access Control Address | |
4263 | * @dev: device | |
4264 | * @sa: new address | |
4265 | * | |
4266 | * Change the hardware (MAC) address of the device | |
4267 | */ | |
1da177e4 LT |
4268 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
4269 | { | |
d314774c | 4270 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
4271 | int err; |
4272 | ||
d314774c | 4273 | if (!ops->ndo_set_mac_address) |
1da177e4 LT |
4274 | return -EOPNOTSUPP; |
4275 | if (sa->sa_family != dev->type) | |
4276 | return -EINVAL; | |
4277 | if (!netif_device_present(dev)) | |
4278 | return -ENODEV; | |
d314774c | 4279 | err = ops->ndo_set_mac_address(dev, sa); |
1da177e4 | 4280 | if (!err) |
056925ab | 4281 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
1da177e4 LT |
4282 | return err; |
4283 | } | |
d1b19dff | 4284 | EXPORT_SYMBOL(dev_set_mac_address); |
1da177e4 LT |
4285 | |
4286 | /* | |
14e3e079 | 4287 | * Perform the SIOCxIFxxx calls, inside read_lock(dev_base_lock) |
1da177e4 | 4288 | */ |
14e3e079 | 4289 | static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd) |
1da177e4 LT |
4290 | { |
4291 | int err; | |
881d966b | 4292 | struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); |
1da177e4 LT |
4293 | |
4294 | if (!dev) | |
4295 | return -ENODEV; | |
4296 | ||
4297 | switch (cmd) { | |
d1b19dff ED |
4298 | case SIOCGIFFLAGS: /* Get interface flags */ |
4299 | ifr->ifr_flags = (short) dev_get_flags(dev); | |
4300 | return 0; | |
1da177e4 | 4301 | |
d1b19dff ED |
4302 | case SIOCGIFMETRIC: /* Get the metric on the interface |
4303 | (currently unused) */ | |
4304 | ifr->ifr_metric = 0; | |
4305 | return 0; | |
1da177e4 | 4306 | |
d1b19dff ED |
4307 | case SIOCGIFMTU: /* Get the MTU of a device */ |
4308 | ifr->ifr_mtu = dev->mtu; | |
4309 | return 0; | |
1da177e4 | 4310 | |
d1b19dff ED |
4311 | case SIOCGIFHWADDR: |
4312 | if (!dev->addr_len) | |
4313 | memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data); | |
4314 | else | |
4315 | memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr, | |
4316 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); | |
4317 | ifr->ifr_hwaddr.sa_family = dev->type; | |
4318 | return 0; | |
1da177e4 | 4319 | |
d1b19dff ED |
4320 | case SIOCGIFSLAVE: |
4321 | err = -EINVAL; | |
4322 | break; | |
14e3e079 | 4323 | |
d1b19dff ED |
4324 | case SIOCGIFMAP: |
4325 | ifr->ifr_map.mem_start = dev->mem_start; | |
4326 | ifr->ifr_map.mem_end = dev->mem_end; | |
4327 | ifr->ifr_map.base_addr = dev->base_addr; | |
4328 | ifr->ifr_map.irq = dev->irq; | |
4329 | ifr->ifr_map.dma = dev->dma; | |
4330 | ifr->ifr_map.port = dev->if_port; | |
4331 | return 0; | |
14e3e079 | 4332 | |
d1b19dff ED |
4333 | case SIOCGIFINDEX: |
4334 | ifr->ifr_ifindex = dev->ifindex; | |
4335 | return 0; | |
14e3e079 | 4336 | |
d1b19dff ED |
4337 | case SIOCGIFTXQLEN: |
4338 | ifr->ifr_qlen = dev->tx_queue_len; | |
4339 | return 0; | |
14e3e079 | 4340 | |
d1b19dff ED |
4341 | default: |
4342 | /* dev_ioctl() should ensure this case | |
4343 | * is never reached | |
4344 | */ | |
4345 | WARN_ON(1); | |
4346 | err = -EINVAL; | |
4347 | break; | |
14e3e079 JG |
4348 | |
4349 | } | |
4350 | return err; | |
4351 | } | |
4352 | ||
4353 | /* | |
4354 | * Perform the SIOCxIFxxx calls, inside rtnl_lock() | |
4355 | */ | |
4356 | static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd) | |
4357 | { | |
4358 | int err; | |
4359 | struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); | |
5f2f6da7 | 4360 | const struct net_device_ops *ops; |
14e3e079 JG |
4361 | |
4362 | if (!dev) | |
4363 | return -ENODEV; | |
4364 | ||
5f2f6da7 JP |
4365 | ops = dev->netdev_ops; |
4366 | ||
14e3e079 | 4367 | switch (cmd) { |
d1b19dff ED |
4368 | case SIOCSIFFLAGS: /* Set interface flags */ |
4369 | return dev_change_flags(dev, ifr->ifr_flags); | |
14e3e079 | 4370 | |
d1b19dff ED |
4371 | case SIOCSIFMETRIC: /* Set the metric on the interface |
4372 | (currently unused) */ | |
4373 | return -EOPNOTSUPP; | |
14e3e079 | 4374 | |
d1b19dff ED |
4375 | case SIOCSIFMTU: /* Set the MTU of a device */ |
4376 | return dev_set_mtu(dev, ifr->ifr_mtu); | |
1da177e4 | 4377 | |
d1b19dff ED |
4378 | case SIOCSIFHWADDR: |
4379 | return dev_set_mac_address(dev, &ifr->ifr_hwaddr); | |
1da177e4 | 4380 | |
d1b19dff ED |
4381 | case SIOCSIFHWBROADCAST: |
4382 | if (ifr->ifr_hwaddr.sa_family != dev->type) | |
4383 | return -EINVAL; | |
4384 | memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, | |
4385 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); | |
4386 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
4387 | return 0; | |
1da177e4 | 4388 | |
d1b19dff ED |
4389 | case SIOCSIFMAP: |
4390 | if (ops->ndo_set_config) { | |
1da177e4 LT |
4391 | if (!netif_device_present(dev)) |
4392 | return -ENODEV; | |
d1b19dff ED |
4393 | return ops->ndo_set_config(dev, &ifr->ifr_map); |
4394 | } | |
4395 | return -EOPNOTSUPP; | |
1da177e4 | 4396 | |
d1b19dff ED |
4397 | case SIOCADDMULTI: |
4398 | if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) || | |
4399 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) | |
4400 | return -EINVAL; | |
4401 | if (!netif_device_present(dev)) | |
4402 | return -ENODEV; | |
4403 | return dev_mc_add(dev, ifr->ifr_hwaddr.sa_data, | |
4404 | dev->addr_len, 1); | |
4405 | ||
4406 | case SIOCDELMULTI: | |
4407 | if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) || | |
4408 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) | |
4409 | return -EINVAL; | |
4410 | if (!netif_device_present(dev)) | |
4411 | return -ENODEV; | |
4412 | return dev_mc_delete(dev, ifr->ifr_hwaddr.sa_data, | |
4413 | dev->addr_len, 1); | |
1da177e4 | 4414 | |
d1b19dff ED |
4415 | case SIOCSIFTXQLEN: |
4416 | if (ifr->ifr_qlen < 0) | |
4417 | return -EINVAL; | |
4418 | dev->tx_queue_len = ifr->ifr_qlen; | |
4419 | return 0; | |
1da177e4 | 4420 | |
d1b19dff ED |
4421 | case SIOCSIFNAME: |
4422 | ifr->ifr_newname[IFNAMSIZ-1] = '\0'; | |
4423 | return dev_change_name(dev, ifr->ifr_newname); | |
1da177e4 | 4424 | |
d1b19dff ED |
4425 | /* |
4426 | * Unknown or private ioctl | |
4427 | */ | |
4428 | default: | |
4429 | if ((cmd >= SIOCDEVPRIVATE && | |
4430 | cmd <= SIOCDEVPRIVATE + 15) || | |
4431 | cmd == SIOCBONDENSLAVE || | |
4432 | cmd == SIOCBONDRELEASE || | |
4433 | cmd == SIOCBONDSETHWADDR || | |
4434 | cmd == SIOCBONDSLAVEINFOQUERY || | |
4435 | cmd == SIOCBONDINFOQUERY || | |
4436 | cmd == SIOCBONDCHANGEACTIVE || | |
4437 | cmd == SIOCGMIIPHY || | |
4438 | cmd == SIOCGMIIREG || | |
4439 | cmd == SIOCSMIIREG || | |
4440 | cmd == SIOCBRADDIF || | |
4441 | cmd == SIOCBRDELIF || | |
4442 | cmd == SIOCSHWTSTAMP || | |
4443 | cmd == SIOCWANDEV) { | |
4444 | err = -EOPNOTSUPP; | |
4445 | if (ops->ndo_do_ioctl) { | |
4446 | if (netif_device_present(dev)) | |
4447 | err = ops->ndo_do_ioctl(dev, ifr, cmd); | |
4448 | else | |
4449 | err = -ENODEV; | |
4450 | } | |
4451 | } else | |
4452 | err = -EINVAL; | |
1da177e4 LT |
4453 | |
4454 | } | |
4455 | return err; | |
4456 | } | |
4457 | ||
4458 | /* | |
4459 | * This function handles all "interface"-type I/O control requests. The actual | |
4460 | * 'doing' part of this is dev_ifsioc above. | |
4461 | */ | |
4462 | ||
4463 | /** | |
4464 | * dev_ioctl - network device ioctl | |
c4ea43c5 | 4465 | * @net: the applicable net namespace |
1da177e4 LT |
4466 | * @cmd: command to issue |
4467 | * @arg: pointer to a struct ifreq in user space | |
4468 | * | |
4469 | * Issue ioctl functions to devices. This is normally called by the | |
4470 | * user space syscall interfaces but can sometimes be useful for | |
4471 | * other purposes. The return value is the return from the syscall if | |
4472 | * positive or a negative errno code on error. | |
4473 | */ | |
4474 | ||
881d966b | 4475 | int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
4476 | { |
4477 | struct ifreq ifr; | |
4478 | int ret; | |
4479 | char *colon; | |
4480 | ||
4481 | /* One special case: SIOCGIFCONF takes ifconf argument | |
4482 | and requires shared lock, because it sleeps writing | |
4483 | to user space. | |
4484 | */ | |
4485 | ||
4486 | if (cmd == SIOCGIFCONF) { | |
6756ae4b | 4487 | rtnl_lock(); |
881d966b | 4488 | ret = dev_ifconf(net, (char __user *) arg); |
6756ae4b | 4489 | rtnl_unlock(); |
1da177e4 LT |
4490 | return ret; |
4491 | } | |
4492 | if (cmd == SIOCGIFNAME) | |
881d966b | 4493 | return dev_ifname(net, (struct ifreq __user *)arg); |
1da177e4 LT |
4494 | |
4495 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
4496 | return -EFAULT; | |
4497 | ||
4498 | ifr.ifr_name[IFNAMSIZ-1] = 0; | |
4499 | ||
4500 | colon = strchr(ifr.ifr_name, ':'); | |
4501 | if (colon) | |
4502 | *colon = 0; | |
4503 | ||
4504 | /* | |
4505 | * See which interface the caller is talking about. | |
4506 | */ | |
4507 | ||
4508 | switch (cmd) { | |
d1b19dff ED |
4509 | /* |
4510 | * These ioctl calls: | |
4511 | * - can be done by all. | |
4512 | * - atomic and do not require locking. | |
4513 | * - return a value | |
4514 | */ | |
4515 | case SIOCGIFFLAGS: | |
4516 | case SIOCGIFMETRIC: | |
4517 | case SIOCGIFMTU: | |
4518 | case SIOCGIFHWADDR: | |
4519 | case SIOCGIFSLAVE: | |
4520 | case SIOCGIFMAP: | |
4521 | case SIOCGIFINDEX: | |
4522 | case SIOCGIFTXQLEN: | |
4523 | dev_load(net, ifr.ifr_name); | |
4524 | read_lock(&dev_base_lock); | |
4525 | ret = dev_ifsioc_locked(net, &ifr, cmd); | |
4526 | read_unlock(&dev_base_lock); | |
4527 | if (!ret) { | |
4528 | if (colon) | |
4529 | *colon = ':'; | |
4530 | if (copy_to_user(arg, &ifr, | |
4531 | sizeof(struct ifreq))) | |
4532 | ret = -EFAULT; | |
4533 | } | |
4534 | return ret; | |
1da177e4 | 4535 | |
d1b19dff ED |
4536 | case SIOCETHTOOL: |
4537 | dev_load(net, ifr.ifr_name); | |
4538 | rtnl_lock(); | |
4539 | ret = dev_ethtool(net, &ifr); | |
4540 | rtnl_unlock(); | |
4541 | if (!ret) { | |
4542 | if (colon) | |
4543 | *colon = ':'; | |
4544 | if (copy_to_user(arg, &ifr, | |
4545 | sizeof(struct ifreq))) | |
4546 | ret = -EFAULT; | |
4547 | } | |
4548 | return ret; | |
1da177e4 | 4549 | |
d1b19dff ED |
4550 | /* |
4551 | * These ioctl calls: | |
4552 | * - require superuser power. | |
4553 | * - require strict serialization. | |
4554 | * - return a value | |
4555 | */ | |
4556 | case SIOCGMIIPHY: | |
4557 | case SIOCGMIIREG: | |
4558 | case SIOCSIFNAME: | |
4559 | if (!capable(CAP_NET_ADMIN)) | |
4560 | return -EPERM; | |
4561 | dev_load(net, ifr.ifr_name); | |
4562 | rtnl_lock(); | |
4563 | ret = dev_ifsioc(net, &ifr, cmd); | |
4564 | rtnl_unlock(); | |
4565 | if (!ret) { | |
4566 | if (colon) | |
4567 | *colon = ':'; | |
4568 | if (copy_to_user(arg, &ifr, | |
4569 | sizeof(struct ifreq))) | |
4570 | ret = -EFAULT; | |
4571 | } | |
4572 | return ret; | |
1da177e4 | 4573 | |
d1b19dff ED |
4574 | /* |
4575 | * These ioctl calls: | |
4576 | * - require superuser power. | |
4577 | * - require strict serialization. | |
4578 | * - do not return a value | |
4579 | */ | |
4580 | case SIOCSIFFLAGS: | |
4581 | case SIOCSIFMETRIC: | |
4582 | case SIOCSIFMTU: | |
4583 | case SIOCSIFMAP: | |
4584 | case SIOCSIFHWADDR: | |
4585 | case SIOCSIFSLAVE: | |
4586 | case SIOCADDMULTI: | |
4587 | case SIOCDELMULTI: | |
4588 | case SIOCSIFHWBROADCAST: | |
4589 | case SIOCSIFTXQLEN: | |
4590 | case SIOCSMIIREG: | |
4591 | case SIOCBONDENSLAVE: | |
4592 | case SIOCBONDRELEASE: | |
4593 | case SIOCBONDSETHWADDR: | |
4594 | case SIOCBONDCHANGEACTIVE: | |
4595 | case SIOCBRADDIF: | |
4596 | case SIOCBRDELIF: | |
4597 | case SIOCSHWTSTAMP: | |
4598 | if (!capable(CAP_NET_ADMIN)) | |
4599 | return -EPERM; | |
4600 | /* fall through */ | |
4601 | case SIOCBONDSLAVEINFOQUERY: | |
4602 | case SIOCBONDINFOQUERY: | |
4603 | dev_load(net, ifr.ifr_name); | |
4604 | rtnl_lock(); | |
4605 | ret = dev_ifsioc(net, &ifr, cmd); | |
4606 | rtnl_unlock(); | |
4607 | return ret; | |
4608 | ||
4609 | case SIOCGIFMEM: | |
4610 | /* Get the per device memory space. We can add this but | |
4611 | * currently do not support it */ | |
4612 | case SIOCSIFMEM: | |
4613 | /* Set the per device memory buffer space. | |
4614 | * Not applicable in our case */ | |
4615 | case SIOCSIFLINK: | |
4616 | return -EINVAL; | |
4617 | ||
4618 | /* | |
4619 | * Unknown or private ioctl. | |
4620 | */ | |
4621 | default: | |
4622 | if (cmd == SIOCWANDEV || | |
4623 | (cmd >= SIOCDEVPRIVATE && | |
4624 | cmd <= SIOCDEVPRIVATE + 15)) { | |
881d966b | 4625 | dev_load(net, ifr.ifr_name); |
1da177e4 | 4626 | rtnl_lock(); |
881d966b | 4627 | ret = dev_ifsioc(net, &ifr, cmd); |
1da177e4 | 4628 | rtnl_unlock(); |
d1b19dff ED |
4629 | if (!ret && copy_to_user(arg, &ifr, |
4630 | sizeof(struct ifreq))) | |
4631 | ret = -EFAULT; | |
1da177e4 | 4632 | return ret; |
d1b19dff ED |
4633 | } |
4634 | /* Take care of Wireless Extensions */ | |
4635 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) | |
4636 | return wext_handle_ioctl(net, &ifr, cmd, arg); | |
4637 | return -EINVAL; | |
1da177e4 LT |
4638 | } |
4639 | } | |
4640 | ||
4641 | ||
4642 | /** | |
4643 | * dev_new_index - allocate an ifindex | |
c4ea43c5 | 4644 | * @net: the applicable net namespace |
1da177e4 LT |
4645 | * |
4646 | * Returns a suitable unique value for a new device interface | |
4647 | * number. The caller must hold the rtnl semaphore or the | |
4648 | * dev_base_lock to be sure it remains unique. | |
4649 | */ | |
881d966b | 4650 | static int dev_new_index(struct net *net) |
1da177e4 LT |
4651 | { |
4652 | static int ifindex; | |
4653 | for (;;) { | |
4654 | if (++ifindex <= 0) | |
4655 | ifindex = 1; | |
881d966b | 4656 | if (!__dev_get_by_index(net, ifindex)) |
1da177e4 LT |
4657 | return ifindex; |
4658 | } | |
4659 | } | |
4660 | ||
1da177e4 | 4661 | /* Delayed registration/unregisteration */ |
3b5b34fd | 4662 | static LIST_HEAD(net_todo_list); |
1da177e4 | 4663 | |
6f05f629 | 4664 | static void net_set_todo(struct net_device *dev) |
1da177e4 | 4665 | { |
1da177e4 | 4666 | list_add_tail(&dev->todo_list, &net_todo_list); |
1da177e4 LT |
4667 | } |
4668 | ||
9b5e383c | 4669 | static void rollback_registered_many(struct list_head *head) |
93ee31f1 | 4670 | { |
9b5e383c ED |
4671 | struct net_device *dev; |
4672 | ||
93ee31f1 DL |
4673 | BUG_ON(dev_boot_phase); |
4674 | ASSERT_RTNL(); | |
4675 | ||
9b5e383c ED |
4676 | list_for_each_entry(dev, head, unreg_list) { |
4677 | /* Some devices call without registering | |
4678 | * for initialization unwind. | |
4679 | */ | |
4680 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
4681 | pr_debug("unregister_netdevice: device %s/%p never " | |
4682 | "was registered\n", dev->name, dev); | |
93ee31f1 | 4683 | |
9b5e383c ED |
4684 | WARN_ON(1); |
4685 | return; | |
4686 | } | |
93ee31f1 | 4687 | |
9b5e383c | 4688 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
93ee31f1 | 4689 | |
9b5e383c ED |
4690 | /* If device is running, close it first. */ |
4691 | dev_close(dev); | |
93ee31f1 | 4692 | |
9b5e383c ED |
4693 | /* And unlink it from device chain. */ |
4694 | unlist_netdevice(dev); | |
93ee31f1 | 4695 | |
9b5e383c ED |
4696 | dev->reg_state = NETREG_UNREGISTERING; |
4697 | } | |
93ee31f1 DL |
4698 | |
4699 | synchronize_net(); | |
4700 | ||
9b5e383c ED |
4701 | list_for_each_entry(dev, head, unreg_list) { |
4702 | /* Shutdown queueing discipline. */ | |
4703 | dev_shutdown(dev); | |
93ee31f1 DL |
4704 | |
4705 | ||
9b5e383c ED |
4706 | /* Notify protocols, that we are about to destroy |
4707 | this device. They should clean all the things. | |
4708 | */ | |
4709 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
93ee31f1 | 4710 | |
9b5e383c ED |
4711 | /* |
4712 | * Flush the unicast and multicast chains | |
4713 | */ | |
4714 | dev_unicast_flush(dev); | |
4715 | dev_addr_discard(dev); | |
93ee31f1 | 4716 | |
9b5e383c ED |
4717 | if (dev->netdev_ops->ndo_uninit) |
4718 | dev->netdev_ops->ndo_uninit(dev); | |
93ee31f1 | 4719 | |
9b5e383c ED |
4720 | /* Notifier chain MUST detach us from master device. */ |
4721 | WARN_ON(dev->master); | |
93ee31f1 | 4722 | |
9b5e383c ED |
4723 | /* Remove entries from kobject tree */ |
4724 | netdev_unregister_kobject(dev); | |
4725 | } | |
93ee31f1 DL |
4726 | |
4727 | synchronize_net(); | |
4728 | ||
9b5e383c ED |
4729 | list_for_each_entry(dev, head, unreg_list) |
4730 | dev_put(dev); | |
4731 | } | |
4732 | ||
4733 | static void rollback_registered(struct net_device *dev) | |
4734 | { | |
4735 | LIST_HEAD(single); | |
4736 | ||
4737 | list_add(&dev->unreg_list, &single); | |
4738 | rollback_registered_many(&single); | |
93ee31f1 DL |
4739 | } |
4740 | ||
e8a0464c DM |
4741 | static void __netdev_init_queue_locks_one(struct net_device *dev, |
4742 | struct netdev_queue *dev_queue, | |
4743 | void *_unused) | |
c773e847 DM |
4744 | { |
4745 | spin_lock_init(&dev_queue->_xmit_lock); | |
cf508b12 | 4746 | netdev_set_xmit_lockdep_class(&dev_queue->_xmit_lock, dev->type); |
c773e847 DM |
4747 | dev_queue->xmit_lock_owner = -1; |
4748 | } | |
4749 | ||
4750 | static void netdev_init_queue_locks(struct net_device *dev) | |
4751 | { | |
e8a0464c DM |
4752 | netdev_for_each_tx_queue(dev, __netdev_init_queue_locks_one, NULL); |
4753 | __netdev_init_queue_locks_one(dev, &dev->rx_queue, NULL); | |
c773e847 DM |
4754 | } |
4755 | ||
b63365a2 HX |
4756 | unsigned long netdev_fix_features(unsigned long features, const char *name) |
4757 | { | |
4758 | /* Fix illegal SG+CSUM combinations. */ | |
4759 | if ((features & NETIF_F_SG) && | |
4760 | !(features & NETIF_F_ALL_CSUM)) { | |
4761 | if (name) | |
4762 | printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no " | |
4763 | "checksum feature.\n", name); | |
4764 | features &= ~NETIF_F_SG; | |
4765 | } | |
4766 | ||
4767 | /* TSO requires that SG is present as well. */ | |
4768 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) { | |
4769 | if (name) | |
4770 | printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no " | |
4771 | "SG feature.\n", name); | |
4772 | features &= ~NETIF_F_TSO; | |
4773 | } | |
4774 | ||
4775 | if (features & NETIF_F_UFO) { | |
4776 | if (!(features & NETIF_F_GEN_CSUM)) { | |
4777 | if (name) | |
4778 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO " | |
4779 | "since no NETIF_F_HW_CSUM feature.\n", | |
4780 | name); | |
4781 | features &= ~NETIF_F_UFO; | |
4782 | } | |
4783 | ||
4784 | if (!(features & NETIF_F_SG)) { | |
4785 | if (name) | |
4786 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO " | |
4787 | "since no NETIF_F_SG feature.\n", name); | |
4788 | features &= ~NETIF_F_UFO; | |
4789 | } | |
4790 | } | |
4791 | ||
4792 | return features; | |
4793 | } | |
4794 | EXPORT_SYMBOL(netdev_fix_features); | |
4795 | ||
1da177e4 LT |
4796 | /** |
4797 | * register_netdevice - register a network device | |
4798 | * @dev: device to register | |
4799 | * | |
4800 | * Take a completed network device structure and add it to the kernel | |
4801 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
4802 | * chain. 0 is returned on success. A negative errno code is returned | |
4803 | * on a failure to set up the device, or if the name is a duplicate. | |
4804 | * | |
4805 | * Callers must hold the rtnl semaphore. You may want | |
4806 | * register_netdev() instead of this. | |
4807 | * | |
4808 | * BUGS: | |
4809 | * The locking appears insufficient to guarantee two parallel registers | |
4810 | * will not get the same name. | |
4811 | */ | |
4812 | ||
4813 | int register_netdevice(struct net_device *dev) | |
4814 | { | |
4815 | struct hlist_head *head; | |
4816 | struct hlist_node *p; | |
4817 | int ret; | |
d314774c | 4818 | struct net *net = dev_net(dev); |
1da177e4 LT |
4819 | |
4820 | BUG_ON(dev_boot_phase); | |
4821 | ASSERT_RTNL(); | |
4822 | ||
b17a7c17 SH |
4823 | might_sleep(); |
4824 | ||
1da177e4 LT |
4825 | /* When net_device's are persistent, this will be fatal. */ |
4826 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
d314774c | 4827 | BUG_ON(!net); |
1da177e4 | 4828 | |
f1f28aa3 | 4829 | spin_lock_init(&dev->addr_list_lock); |
cf508b12 | 4830 | netdev_set_addr_lockdep_class(dev); |
c773e847 | 4831 | netdev_init_queue_locks(dev); |
1da177e4 | 4832 | |
1da177e4 LT |
4833 | dev->iflink = -1; |
4834 | ||
4835 | /* Init, if this function is available */ | |
d314774c SH |
4836 | if (dev->netdev_ops->ndo_init) { |
4837 | ret = dev->netdev_ops->ndo_init(dev); | |
1da177e4 LT |
4838 | if (ret) { |
4839 | if (ret > 0) | |
4840 | ret = -EIO; | |
90833aa4 | 4841 | goto out; |
1da177e4 LT |
4842 | } |
4843 | } | |
4ec93edb | 4844 | |
1da177e4 LT |
4845 | if (!dev_valid_name(dev->name)) { |
4846 | ret = -EINVAL; | |
7ce1b0ed | 4847 | goto err_uninit; |
1da177e4 LT |
4848 | } |
4849 | ||
881d966b | 4850 | dev->ifindex = dev_new_index(net); |
1da177e4 LT |
4851 | if (dev->iflink == -1) |
4852 | dev->iflink = dev->ifindex; | |
4853 | ||
4854 | /* Check for existence of name */ | |
881d966b | 4855 | head = dev_name_hash(net, dev->name); |
1da177e4 LT |
4856 | hlist_for_each(p, head) { |
4857 | struct net_device *d | |
4858 | = hlist_entry(p, struct net_device, name_hlist); | |
4859 | if (!strncmp(d->name, dev->name, IFNAMSIZ)) { | |
4860 | ret = -EEXIST; | |
7ce1b0ed | 4861 | goto err_uninit; |
1da177e4 | 4862 | } |
4ec93edb | 4863 | } |
1da177e4 | 4864 | |
d212f87b SH |
4865 | /* Fix illegal checksum combinations */ |
4866 | if ((dev->features & NETIF_F_HW_CSUM) && | |
4867 | (dev->features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
4868 | printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n", | |
4869 | dev->name); | |
4870 | dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); | |
4871 | } | |
4872 | ||
4873 | if ((dev->features & NETIF_F_NO_CSUM) && | |
4874 | (dev->features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
4875 | printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n", | |
4876 | dev->name); | |
4877 | dev->features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM); | |
4878 | } | |
4879 | ||
b63365a2 | 4880 | dev->features = netdev_fix_features(dev->features, dev->name); |
1da177e4 | 4881 | |
e5a4a72d LB |
4882 | /* Enable software GSO if SG is supported. */ |
4883 | if (dev->features & NETIF_F_SG) | |
4884 | dev->features |= NETIF_F_GSO; | |
4885 | ||
aaf8cdc3 | 4886 | netdev_initialize_kobject(dev); |
7ffbe3fd JB |
4887 | |
4888 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); | |
4889 | ret = notifier_to_errno(ret); | |
4890 | if (ret) | |
4891 | goto err_uninit; | |
4892 | ||
8b41d188 | 4893 | ret = netdev_register_kobject(dev); |
b17a7c17 | 4894 | if (ret) |
7ce1b0ed | 4895 | goto err_uninit; |
b17a7c17 SH |
4896 | dev->reg_state = NETREG_REGISTERED; |
4897 | ||
1da177e4 LT |
4898 | /* |
4899 | * Default initial state at registry is that the | |
4900 | * device is present. | |
4901 | */ | |
4902 | ||
4903 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
4904 | ||
1da177e4 | 4905 | dev_init_scheduler(dev); |
1da177e4 | 4906 | dev_hold(dev); |
ce286d32 | 4907 | list_netdevice(dev); |
1da177e4 LT |
4908 | |
4909 | /* Notify protocols, that a new device appeared. */ | |
056925ab | 4910 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
fcc5a03a | 4911 | ret = notifier_to_errno(ret); |
93ee31f1 DL |
4912 | if (ret) { |
4913 | rollback_registered(dev); | |
4914 | dev->reg_state = NETREG_UNREGISTERED; | |
4915 | } | |
1da177e4 LT |
4916 | |
4917 | out: | |
4918 | return ret; | |
7ce1b0ed HX |
4919 | |
4920 | err_uninit: | |
d314774c SH |
4921 | if (dev->netdev_ops->ndo_uninit) |
4922 | dev->netdev_ops->ndo_uninit(dev); | |
7ce1b0ed | 4923 | goto out; |
1da177e4 | 4924 | } |
d1b19dff | 4925 | EXPORT_SYMBOL(register_netdevice); |
1da177e4 | 4926 | |
937f1ba5 BH |
4927 | /** |
4928 | * init_dummy_netdev - init a dummy network device for NAPI | |
4929 | * @dev: device to init | |
4930 | * | |
4931 | * This takes a network device structure and initialize the minimum | |
4932 | * amount of fields so it can be used to schedule NAPI polls without | |
4933 | * registering a full blown interface. This is to be used by drivers | |
4934 | * that need to tie several hardware interfaces to a single NAPI | |
4935 | * poll scheduler due to HW limitations. | |
4936 | */ | |
4937 | int init_dummy_netdev(struct net_device *dev) | |
4938 | { | |
4939 | /* Clear everything. Note we don't initialize spinlocks | |
4940 | * are they aren't supposed to be taken by any of the | |
4941 | * NAPI code and this dummy netdev is supposed to be | |
4942 | * only ever used for NAPI polls | |
4943 | */ | |
4944 | memset(dev, 0, sizeof(struct net_device)); | |
4945 | ||
4946 | /* make sure we BUG if trying to hit standard | |
4947 | * register/unregister code path | |
4948 | */ | |
4949 | dev->reg_state = NETREG_DUMMY; | |
4950 | ||
4951 | /* initialize the ref count */ | |
4952 | atomic_set(&dev->refcnt, 1); | |
4953 | ||
4954 | /* NAPI wants this */ | |
4955 | INIT_LIST_HEAD(&dev->napi_list); | |
4956 | ||
4957 | /* a dummy interface is started by default */ | |
4958 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
4959 | set_bit(__LINK_STATE_START, &dev->state); | |
4960 | ||
4961 | return 0; | |
4962 | } | |
4963 | EXPORT_SYMBOL_GPL(init_dummy_netdev); | |
4964 | ||
4965 | ||
1da177e4 LT |
4966 | /** |
4967 | * register_netdev - register a network device | |
4968 | * @dev: device to register | |
4969 | * | |
4970 | * Take a completed network device structure and add it to the kernel | |
4971 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
4972 | * chain. 0 is returned on success. A negative errno code is returned | |
4973 | * on a failure to set up the device, or if the name is a duplicate. | |
4974 | * | |
38b4da38 | 4975 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
4976 | * and expands the device name if you passed a format string to |
4977 | * alloc_netdev. | |
4978 | */ | |
4979 | int register_netdev(struct net_device *dev) | |
4980 | { | |
4981 | int err; | |
4982 | ||
4983 | rtnl_lock(); | |
4984 | ||
4985 | /* | |
4986 | * If the name is a format string the caller wants us to do a | |
4987 | * name allocation. | |
4988 | */ | |
4989 | if (strchr(dev->name, '%')) { | |
4990 | err = dev_alloc_name(dev, dev->name); | |
4991 | if (err < 0) | |
4992 | goto out; | |
4993 | } | |
4ec93edb | 4994 | |
1da177e4 LT |
4995 | err = register_netdevice(dev); |
4996 | out: | |
4997 | rtnl_unlock(); | |
4998 | return err; | |
4999 | } | |
5000 | EXPORT_SYMBOL(register_netdev); | |
5001 | ||
5002 | /* | |
5003 | * netdev_wait_allrefs - wait until all references are gone. | |
5004 | * | |
5005 | * This is called when unregistering network devices. | |
5006 | * | |
5007 | * Any protocol or device that holds a reference should register | |
5008 | * for netdevice notification, and cleanup and put back the | |
5009 | * reference if they receive an UNREGISTER event. | |
5010 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 5011 | * call dev_put. |
1da177e4 LT |
5012 | */ |
5013 | static void netdev_wait_allrefs(struct net_device *dev) | |
5014 | { | |
5015 | unsigned long rebroadcast_time, warning_time; | |
5016 | ||
5017 | rebroadcast_time = warning_time = jiffies; | |
5018 | while (atomic_read(&dev->refcnt) != 0) { | |
5019 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { | |
6756ae4b | 5020 | rtnl_lock(); |
1da177e4 LT |
5021 | |
5022 | /* Rebroadcast unregister notification */ | |
056925ab | 5023 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
1da177e4 LT |
5024 | |
5025 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, | |
5026 | &dev->state)) { | |
5027 | /* We must not have linkwatch events | |
5028 | * pending on unregister. If this | |
5029 | * happens, we simply run the queue | |
5030 | * unscheduled, resulting in a noop | |
5031 | * for this device. | |
5032 | */ | |
5033 | linkwatch_run_queue(); | |
5034 | } | |
5035 | ||
6756ae4b | 5036 | __rtnl_unlock(); |
1da177e4 LT |
5037 | |
5038 | rebroadcast_time = jiffies; | |
5039 | } | |
5040 | ||
5041 | msleep(250); | |
5042 | ||
5043 | if (time_after(jiffies, warning_time + 10 * HZ)) { | |
5044 | printk(KERN_EMERG "unregister_netdevice: " | |
5045 | "waiting for %s to become free. Usage " | |
5046 | "count = %d\n", | |
5047 | dev->name, atomic_read(&dev->refcnt)); | |
5048 | warning_time = jiffies; | |
5049 | } | |
5050 | } | |
5051 | } | |
5052 | ||
5053 | /* The sequence is: | |
5054 | * | |
5055 | * rtnl_lock(); | |
5056 | * ... | |
5057 | * register_netdevice(x1); | |
5058 | * register_netdevice(x2); | |
5059 | * ... | |
5060 | * unregister_netdevice(y1); | |
5061 | * unregister_netdevice(y2); | |
5062 | * ... | |
5063 | * rtnl_unlock(); | |
5064 | * free_netdev(y1); | |
5065 | * free_netdev(y2); | |
5066 | * | |
58ec3b4d | 5067 | * We are invoked by rtnl_unlock(). |
1da177e4 | 5068 | * This allows us to deal with problems: |
b17a7c17 | 5069 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
5070 | * without deadlocking with linkwatch via keventd. |
5071 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
5072 | * safely in order to wait for the netdev refcnt to drop to zero. | |
58ec3b4d HX |
5073 | * |
5074 | * We must not return until all unregister events added during | |
5075 | * the interval the lock was held have been completed. | |
1da177e4 | 5076 | */ |
1da177e4 LT |
5077 | void netdev_run_todo(void) |
5078 | { | |
626ab0e6 | 5079 | struct list_head list; |
1da177e4 | 5080 | |
1da177e4 | 5081 | /* Snapshot list, allow later requests */ |
626ab0e6 | 5082 | list_replace_init(&net_todo_list, &list); |
58ec3b4d HX |
5083 | |
5084 | __rtnl_unlock(); | |
626ab0e6 | 5085 | |
1da177e4 LT |
5086 | while (!list_empty(&list)) { |
5087 | struct net_device *dev | |
5088 | = list_entry(list.next, struct net_device, todo_list); | |
5089 | list_del(&dev->todo_list); | |
5090 | ||
b17a7c17 SH |
5091 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
5092 | printk(KERN_ERR "network todo '%s' but state %d\n", | |
5093 | dev->name, dev->reg_state); | |
5094 | dump_stack(); | |
5095 | continue; | |
5096 | } | |
1da177e4 | 5097 | |
b17a7c17 | 5098 | dev->reg_state = NETREG_UNREGISTERED; |
1da177e4 | 5099 | |
6e583ce5 SH |
5100 | on_each_cpu(flush_backlog, dev, 1); |
5101 | ||
b17a7c17 | 5102 | netdev_wait_allrefs(dev); |
1da177e4 | 5103 | |
b17a7c17 SH |
5104 | /* paranoia */ |
5105 | BUG_ON(atomic_read(&dev->refcnt)); | |
547b792c IJ |
5106 | WARN_ON(dev->ip_ptr); |
5107 | WARN_ON(dev->ip6_ptr); | |
5108 | WARN_ON(dev->dn_ptr); | |
1da177e4 | 5109 | |
b17a7c17 SH |
5110 | if (dev->destructor) |
5111 | dev->destructor(dev); | |
9093bbb2 SH |
5112 | |
5113 | /* Free network device */ | |
5114 | kobject_put(&dev->dev.kobj); | |
1da177e4 | 5115 | } |
1da177e4 LT |
5116 | } |
5117 | ||
eeda3fd6 SH |
5118 | /** |
5119 | * dev_get_stats - get network device statistics | |
5120 | * @dev: device to get statistics from | |
5121 | * | |
5122 | * Get network statistics from device. The device driver may provide | |
5123 | * its own method by setting dev->netdev_ops->get_stats; otherwise | |
5124 | * the internal statistics structure is used. | |
5125 | */ | |
5126 | const struct net_device_stats *dev_get_stats(struct net_device *dev) | |
7004bf25 | 5127 | { |
eeda3fd6 SH |
5128 | const struct net_device_ops *ops = dev->netdev_ops; |
5129 | ||
5130 | if (ops->ndo_get_stats) | |
5131 | return ops->ndo_get_stats(dev); | |
7004bf25 ED |
5132 | else { |
5133 | unsigned long tx_bytes = 0, tx_packets = 0, tx_dropped = 0; | |
5134 | struct net_device_stats *stats = &dev->stats; | |
5135 | unsigned int i; | |
5136 | struct netdev_queue *txq; | |
5137 | ||
5138 | for (i = 0; i < dev->num_tx_queues; i++) { | |
5139 | txq = netdev_get_tx_queue(dev, i); | |
5140 | tx_bytes += txq->tx_bytes; | |
5141 | tx_packets += txq->tx_packets; | |
5142 | tx_dropped += txq->tx_dropped; | |
5143 | } | |
5144 | if (tx_bytes || tx_packets || tx_dropped) { | |
5145 | stats->tx_bytes = tx_bytes; | |
5146 | stats->tx_packets = tx_packets; | |
5147 | stats->tx_dropped = tx_dropped; | |
5148 | } | |
5149 | return stats; | |
5150 | } | |
c45d286e | 5151 | } |
eeda3fd6 | 5152 | EXPORT_SYMBOL(dev_get_stats); |
c45d286e | 5153 | |
dc2b4847 | 5154 | static void netdev_init_one_queue(struct net_device *dev, |
e8a0464c DM |
5155 | struct netdev_queue *queue, |
5156 | void *_unused) | |
dc2b4847 | 5157 | { |
dc2b4847 DM |
5158 | queue->dev = dev; |
5159 | } | |
5160 | ||
bb949fbd DM |
5161 | static void netdev_init_queues(struct net_device *dev) |
5162 | { | |
e8a0464c DM |
5163 | netdev_init_one_queue(dev, &dev->rx_queue, NULL); |
5164 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); | |
c3f26a26 | 5165 | spin_lock_init(&dev->tx_global_lock); |
bb949fbd DM |
5166 | } |
5167 | ||
1da177e4 | 5168 | /** |
f25f4e44 | 5169 | * alloc_netdev_mq - allocate network device |
1da177e4 LT |
5170 | * @sizeof_priv: size of private data to allocate space for |
5171 | * @name: device name format string | |
5172 | * @setup: callback to initialize device | |
f25f4e44 | 5173 | * @queue_count: the number of subqueues to allocate |
1da177e4 LT |
5174 | * |
5175 | * Allocates a struct net_device with private data area for driver use | |
f25f4e44 PWJ |
5176 | * and performs basic initialization. Also allocates subquue structs |
5177 | * for each queue on the device at the end of the netdevice. | |
1da177e4 | 5178 | */ |
f25f4e44 PWJ |
5179 | struct net_device *alloc_netdev_mq(int sizeof_priv, const char *name, |
5180 | void (*setup)(struct net_device *), unsigned int queue_count) | |
1da177e4 | 5181 | { |
e8a0464c | 5182 | struct netdev_queue *tx; |
1da177e4 | 5183 | struct net_device *dev; |
7943986c | 5184 | size_t alloc_size; |
1ce8e7b5 | 5185 | struct net_device *p; |
1da177e4 | 5186 | |
b6fe17d6 SH |
5187 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
5188 | ||
fd2ea0a7 | 5189 | alloc_size = sizeof(struct net_device); |
d1643d24 AD |
5190 | if (sizeof_priv) { |
5191 | /* ensure 32-byte alignment of private area */ | |
1ce8e7b5 | 5192 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
d1643d24 AD |
5193 | alloc_size += sizeof_priv; |
5194 | } | |
5195 | /* ensure 32-byte alignment of whole construct */ | |
1ce8e7b5 | 5196 | alloc_size += NETDEV_ALIGN - 1; |
1da177e4 | 5197 | |
31380de9 | 5198 | p = kzalloc(alloc_size, GFP_KERNEL); |
1da177e4 | 5199 | if (!p) { |
b6fe17d6 | 5200 | printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n"); |
1da177e4 LT |
5201 | return NULL; |
5202 | } | |
1da177e4 | 5203 | |
7943986c | 5204 | tx = kcalloc(queue_count, sizeof(struct netdev_queue), GFP_KERNEL); |
e8a0464c DM |
5205 | if (!tx) { |
5206 | printk(KERN_ERR "alloc_netdev: Unable to allocate " | |
5207 | "tx qdiscs.\n"); | |
ab9c73cc | 5208 | goto free_p; |
e8a0464c DM |
5209 | } |
5210 | ||
1ce8e7b5 | 5211 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
1da177e4 | 5212 | dev->padded = (char *)dev - (char *)p; |
ab9c73cc JP |
5213 | |
5214 | if (dev_addr_init(dev)) | |
5215 | goto free_tx; | |
5216 | ||
ccffad25 JP |
5217 | dev_unicast_init(dev); |
5218 | ||
c346dca1 | 5219 | dev_net_set(dev, &init_net); |
1da177e4 | 5220 | |
e8a0464c DM |
5221 | dev->_tx = tx; |
5222 | dev->num_tx_queues = queue_count; | |
fd2ea0a7 | 5223 | dev->real_num_tx_queues = queue_count; |
e8a0464c | 5224 | |
82cc1a7a | 5225 | dev->gso_max_size = GSO_MAX_SIZE; |
1da177e4 | 5226 | |
bb949fbd DM |
5227 | netdev_init_queues(dev); |
5228 | ||
d565b0a1 | 5229 | INIT_LIST_HEAD(&dev->napi_list); |
93f154b5 | 5230 | dev->priv_flags = IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
5231 | setup(dev); |
5232 | strcpy(dev->name, name); | |
5233 | return dev; | |
ab9c73cc JP |
5234 | |
5235 | free_tx: | |
5236 | kfree(tx); | |
5237 | ||
5238 | free_p: | |
5239 | kfree(p); | |
5240 | return NULL; | |
1da177e4 | 5241 | } |
f25f4e44 | 5242 | EXPORT_SYMBOL(alloc_netdev_mq); |
1da177e4 LT |
5243 | |
5244 | /** | |
5245 | * free_netdev - free network device | |
5246 | * @dev: device | |
5247 | * | |
4ec93edb YH |
5248 | * This function does the last stage of destroying an allocated device |
5249 | * interface. The reference to the device object is released. | |
1da177e4 LT |
5250 | * If this is the last reference then it will be freed. |
5251 | */ | |
5252 | void free_netdev(struct net_device *dev) | |
5253 | { | |
d565b0a1 HX |
5254 | struct napi_struct *p, *n; |
5255 | ||
f3005d7f DL |
5256 | release_net(dev_net(dev)); |
5257 | ||
e8a0464c DM |
5258 | kfree(dev->_tx); |
5259 | ||
f001fde5 JP |
5260 | /* Flush device addresses */ |
5261 | dev_addr_flush(dev); | |
5262 | ||
d565b0a1 HX |
5263 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
5264 | netif_napi_del(p); | |
5265 | ||
3041a069 | 5266 | /* Compatibility with error handling in drivers */ |
1da177e4 LT |
5267 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
5268 | kfree((char *)dev - dev->padded); | |
5269 | return; | |
5270 | } | |
5271 | ||
5272 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
5273 | dev->reg_state = NETREG_RELEASED; | |
5274 | ||
43cb76d9 GKH |
5275 | /* will free via device release */ |
5276 | put_device(&dev->dev); | |
1da177e4 | 5277 | } |
d1b19dff | 5278 | EXPORT_SYMBOL(free_netdev); |
4ec93edb | 5279 | |
f0db275a SH |
5280 | /** |
5281 | * synchronize_net - Synchronize with packet receive processing | |
5282 | * | |
5283 | * Wait for packets currently being received to be done. | |
5284 | * Does not block later packets from starting. | |
5285 | */ | |
4ec93edb | 5286 | void synchronize_net(void) |
1da177e4 LT |
5287 | { |
5288 | might_sleep(); | |
fbd568a3 | 5289 | synchronize_rcu(); |
1da177e4 | 5290 | } |
d1b19dff | 5291 | EXPORT_SYMBOL(synchronize_net); |
1da177e4 LT |
5292 | |
5293 | /** | |
44a0873d | 5294 | * unregister_netdevice_queue - remove device from the kernel |
1da177e4 | 5295 | * @dev: device |
44a0873d ED |
5296 | * @head: list |
5297 | ||
1da177e4 | 5298 | * This function shuts down a device interface and removes it |
d59b54b1 | 5299 | * from the kernel tables. |
44a0873d | 5300 | * If head not NULL, device is queued to be unregistered later. |
1da177e4 LT |
5301 | * |
5302 | * Callers must hold the rtnl semaphore. You may want | |
5303 | * unregister_netdev() instead of this. | |
5304 | */ | |
5305 | ||
44a0873d | 5306 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
1da177e4 | 5307 | { |
a6620712 HX |
5308 | ASSERT_RTNL(); |
5309 | ||
44a0873d ED |
5310 | if (head) { |
5311 | list_add_tail(&dev->unreg_list, head); | |
5312 | } else { | |
5313 | rollback_registered(dev); | |
5314 | /* Finish processing unregister after unlock */ | |
5315 | net_set_todo(dev); | |
5316 | } | |
1da177e4 | 5317 | } |
44a0873d | 5318 | EXPORT_SYMBOL(unregister_netdevice_queue); |
1da177e4 | 5319 | |
9b5e383c ED |
5320 | /** |
5321 | * unregister_netdevice_many - unregister many devices | |
5322 | * @head: list of devices | |
5323 | * | |
5324 | */ | |
5325 | void unregister_netdevice_many(struct list_head *head) | |
5326 | { | |
5327 | struct net_device *dev; | |
5328 | ||
5329 | if (!list_empty(head)) { | |
5330 | rollback_registered_many(head); | |
5331 | list_for_each_entry(dev, head, unreg_list) | |
5332 | net_set_todo(dev); | |
5333 | } | |
5334 | } | |
63c8099d | 5335 | EXPORT_SYMBOL(unregister_netdevice_many); |
9b5e383c | 5336 | |
1da177e4 LT |
5337 | /** |
5338 | * unregister_netdev - remove device from the kernel | |
5339 | * @dev: device | |
5340 | * | |
5341 | * This function shuts down a device interface and removes it | |
d59b54b1 | 5342 | * from the kernel tables. |
1da177e4 LT |
5343 | * |
5344 | * This is just a wrapper for unregister_netdevice that takes | |
5345 | * the rtnl semaphore. In general you want to use this and not | |
5346 | * unregister_netdevice. | |
5347 | */ | |
5348 | void unregister_netdev(struct net_device *dev) | |
5349 | { | |
5350 | rtnl_lock(); | |
5351 | unregister_netdevice(dev); | |
5352 | rtnl_unlock(); | |
5353 | } | |
1da177e4 LT |
5354 | EXPORT_SYMBOL(unregister_netdev); |
5355 | ||
ce286d32 EB |
5356 | /** |
5357 | * dev_change_net_namespace - move device to different nethost namespace | |
5358 | * @dev: device | |
5359 | * @net: network namespace | |
5360 | * @pat: If not NULL name pattern to try if the current device name | |
5361 | * is already taken in the destination network namespace. | |
5362 | * | |
5363 | * This function shuts down a device interface and moves it | |
5364 | * to a new network namespace. On success 0 is returned, on | |
5365 | * a failure a netagive errno code is returned. | |
5366 | * | |
5367 | * Callers must hold the rtnl semaphore. | |
5368 | */ | |
5369 | ||
5370 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) | |
5371 | { | |
5372 | char buf[IFNAMSIZ]; | |
5373 | const char *destname; | |
5374 | int err; | |
5375 | ||
5376 | ASSERT_RTNL(); | |
5377 | ||
5378 | /* Don't allow namespace local devices to be moved. */ | |
5379 | err = -EINVAL; | |
5380 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
5381 | goto out; | |
5382 | ||
3891845e EB |
5383 | #ifdef CONFIG_SYSFS |
5384 | /* Don't allow real devices to be moved when sysfs | |
5385 | * is enabled. | |
5386 | */ | |
5387 | err = -EINVAL; | |
5388 | if (dev->dev.parent) | |
5389 | goto out; | |
5390 | #endif | |
5391 | ||
ce286d32 EB |
5392 | /* Ensure the device has been registrered */ |
5393 | err = -EINVAL; | |
5394 | if (dev->reg_state != NETREG_REGISTERED) | |
5395 | goto out; | |
5396 | ||
5397 | /* Get out if there is nothing todo */ | |
5398 | err = 0; | |
878628fb | 5399 | if (net_eq(dev_net(dev), net)) |
ce286d32 EB |
5400 | goto out; |
5401 | ||
5402 | /* Pick the destination device name, and ensure | |
5403 | * we can use it in the destination network namespace. | |
5404 | */ | |
5405 | err = -EEXIST; | |
5406 | destname = dev->name; | |
5407 | if (__dev_get_by_name(net, destname)) { | |
5408 | /* We get here if we can't use the current device name */ | |
5409 | if (!pat) | |
5410 | goto out; | |
5411 | if (!dev_valid_name(pat)) | |
5412 | goto out; | |
5413 | if (strchr(pat, '%')) { | |
5414 | if (__dev_alloc_name(net, pat, buf) < 0) | |
5415 | goto out; | |
5416 | destname = buf; | |
5417 | } else | |
5418 | destname = pat; | |
5419 | if (__dev_get_by_name(net, destname)) | |
5420 | goto out; | |
5421 | } | |
5422 | ||
5423 | /* | |
5424 | * And now a mini version of register_netdevice unregister_netdevice. | |
5425 | */ | |
5426 | ||
5427 | /* If device is running close it first. */ | |
9b772652 | 5428 | dev_close(dev); |
ce286d32 EB |
5429 | |
5430 | /* And unlink it from device chain */ | |
5431 | err = -ENODEV; | |
5432 | unlist_netdevice(dev); | |
5433 | ||
5434 | synchronize_net(); | |
5435 | ||
5436 | /* Shutdown queueing discipline. */ | |
5437 | dev_shutdown(dev); | |
5438 | ||
5439 | /* Notify protocols, that we are about to destroy | |
5440 | this device. They should clean all the things. | |
5441 | */ | |
5442 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
5443 | ||
5444 | /* | |
5445 | * Flush the unicast and multicast chains | |
5446 | */ | |
ccffad25 | 5447 | dev_unicast_flush(dev); |
ce286d32 EB |
5448 | dev_addr_discard(dev); |
5449 | ||
3891845e EB |
5450 | netdev_unregister_kobject(dev); |
5451 | ||
ce286d32 | 5452 | /* Actually switch the network namespace */ |
c346dca1 | 5453 | dev_net_set(dev, net); |
ce286d32 EB |
5454 | |
5455 | /* Assign the new device name */ | |
5456 | if (destname != dev->name) | |
5457 | strcpy(dev->name, destname); | |
5458 | ||
5459 | /* If there is an ifindex conflict assign a new one */ | |
5460 | if (__dev_get_by_index(net, dev->ifindex)) { | |
5461 | int iflink = (dev->iflink == dev->ifindex); | |
5462 | dev->ifindex = dev_new_index(net); | |
5463 | if (iflink) | |
5464 | dev->iflink = dev->ifindex; | |
5465 | } | |
5466 | ||
8b41d188 | 5467 | /* Fixup kobjects */ |
aaf8cdc3 | 5468 | err = netdev_register_kobject(dev); |
8b41d188 | 5469 | WARN_ON(err); |
ce286d32 EB |
5470 | |
5471 | /* Add the device back in the hashes */ | |
5472 | list_netdevice(dev); | |
5473 | ||
5474 | /* Notify protocols, that a new device appeared. */ | |
5475 | call_netdevice_notifiers(NETDEV_REGISTER, dev); | |
5476 | ||
5477 | synchronize_net(); | |
5478 | err = 0; | |
5479 | out: | |
5480 | return err; | |
5481 | } | |
463d0183 | 5482 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
ce286d32 | 5483 | |
1da177e4 LT |
5484 | static int dev_cpu_callback(struct notifier_block *nfb, |
5485 | unsigned long action, | |
5486 | void *ocpu) | |
5487 | { | |
5488 | struct sk_buff **list_skb; | |
37437bb2 | 5489 | struct Qdisc **list_net; |
1da177e4 LT |
5490 | struct sk_buff *skb; |
5491 | unsigned int cpu, oldcpu = (unsigned long)ocpu; | |
5492 | struct softnet_data *sd, *oldsd; | |
5493 | ||
8bb78442 | 5494 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
1da177e4 LT |
5495 | return NOTIFY_OK; |
5496 | ||
5497 | local_irq_disable(); | |
5498 | cpu = smp_processor_id(); | |
5499 | sd = &per_cpu(softnet_data, cpu); | |
5500 | oldsd = &per_cpu(softnet_data, oldcpu); | |
5501 | ||
5502 | /* Find end of our completion_queue. */ | |
5503 | list_skb = &sd->completion_queue; | |
5504 | while (*list_skb) | |
5505 | list_skb = &(*list_skb)->next; | |
5506 | /* Append completion queue from offline CPU. */ | |
5507 | *list_skb = oldsd->completion_queue; | |
5508 | oldsd->completion_queue = NULL; | |
5509 | ||
5510 | /* Find end of our output_queue. */ | |
5511 | list_net = &sd->output_queue; | |
5512 | while (*list_net) | |
5513 | list_net = &(*list_net)->next_sched; | |
5514 | /* Append output queue from offline CPU. */ | |
5515 | *list_net = oldsd->output_queue; | |
5516 | oldsd->output_queue = NULL; | |
5517 | ||
5518 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
5519 | local_irq_enable(); | |
5520 | ||
5521 | /* Process offline CPU's input_pkt_queue */ | |
5522 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) | |
5523 | netif_rx(skb); | |
5524 | ||
5525 | return NOTIFY_OK; | |
5526 | } | |
1da177e4 LT |
5527 | |
5528 | ||
7f353bf2 | 5529 | /** |
b63365a2 HX |
5530 | * netdev_increment_features - increment feature set by one |
5531 | * @all: current feature set | |
5532 | * @one: new feature set | |
5533 | * @mask: mask feature set | |
7f353bf2 HX |
5534 | * |
5535 | * Computes a new feature set after adding a device with feature set | |
b63365a2 HX |
5536 | * @one to the master device with current feature set @all. Will not |
5537 | * enable anything that is off in @mask. Returns the new feature set. | |
7f353bf2 | 5538 | */ |
b63365a2 HX |
5539 | unsigned long netdev_increment_features(unsigned long all, unsigned long one, |
5540 | unsigned long mask) | |
5541 | { | |
5542 | /* If device needs checksumming, downgrade to it. */ | |
d1b19dff | 5543 | if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM)) |
b63365a2 HX |
5544 | all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM); |
5545 | else if (mask & NETIF_F_ALL_CSUM) { | |
5546 | /* If one device supports v4/v6 checksumming, set for all. */ | |
5547 | if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) && | |
5548 | !(all & NETIF_F_GEN_CSUM)) { | |
5549 | all &= ~NETIF_F_ALL_CSUM; | |
5550 | all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM); | |
5551 | } | |
e2a6b852 | 5552 | |
b63365a2 HX |
5553 | /* If one device supports hw checksumming, set for all. */ |
5554 | if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) { | |
5555 | all &= ~NETIF_F_ALL_CSUM; | |
5556 | all |= NETIF_F_HW_CSUM; | |
5557 | } | |
5558 | } | |
7f353bf2 | 5559 | |
b63365a2 | 5560 | one |= NETIF_F_ALL_CSUM; |
7f353bf2 | 5561 | |
b63365a2 | 5562 | one |= all & NETIF_F_ONE_FOR_ALL; |
d9f5950f | 5563 | all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO; |
b63365a2 | 5564 | all |= one & mask & NETIF_F_ONE_FOR_ALL; |
7f353bf2 HX |
5565 | |
5566 | return all; | |
5567 | } | |
b63365a2 | 5568 | EXPORT_SYMBOL(netdev_increment_features); |
7f353bf2 | 5569 | |
30d97d35 PE |
5570 | static struct hlist_head *netdev_create_hash(void) |
5571 | { | |
5572 | int i; | |
5573 | struct hlist_head *hash; | |
5574 | ||
5575 | hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); | |
5576 | if (hash != NULL) | |
5577 | for (i = 0; i < NETDEV_HASHENTRIES; i++) | |
5578 | INIT_HLIST_HEAD(&hash[i]); | |
5579 | ||
5580 | return hash; | |
5581 | } | |
5582 | ||
881d966b | 5583 | /* Initialize per network namespace state */ |
4665079c | 5584 | static int __net_init netdev_init(struct net *net) |
881d966b | 5585 | { |
881d966b | 5586 | INIT_LIST_HEAD(&net->dev_base_head); |
881d966b | 5587 | |
30d97d35 PE |
5588 | net->dev_name_head = netdev_create_hash(); |
5589 | if (net->dev_name_head == NULL) | |
5590 | goto err_name; | |
881d966b | 5591 | |
30d97d35 PE |
5592 | net->dev_index_head = netdev_create_hash(); |
5593 | if (net->dev_index_head == NULL) | |
5594 | goto err_idx; | |
881d966b EB |
5595 | |
5596 | return 0; | |
30d97d35 PE |
5597 | |
5598 | err_idx: | |
5599 | kfree(net->dev_name_head); | |
5600 | err_name: | |
5601 | return -ENOMEM; | |
881d966b EB |
5602 | } |
5603 | ||
f0db275a SH |
5604 | /** |
5605 | * netdev_drivername - network driver for the device | |
5606 | * @dev: network device | |
5607 | * @buffer: buffer for resulting name | |
5608 | * @len: size of buffer | |
5609 | * | |
5610 | * Determine network driver for device. | |
5611 | */ | |
cf04a4c7 | 5612 | char *netdev_drivername(const struct net_device *dev, char *buffer, int len) |
6579e57b | 5613 | { |
cf04a4c7 SH |
5614 | const struct device_driver *driver; |
5615 | const struct device *parent; | |
6579e57b AV |
5616 | |
5617 | if (len <= 0 || !buffer) | |
5618 | return buffer; | |
5619 | buffer[0] = 0; | |
5620 | ||
5621 | parent = dev->dev.parent; | |
5622 | ||
5623 | if (!parent) | |
5624 | return buffer; | |
5625 | ||
5626 | driver = parent->driver; | |
5627 | if (driver && driver->name) | |
5628 | strlcpy(buffer, driver->name, len); | |
5629 | return buffer; | |
5630 | } | |
5631 | ||
4665079c | 5632 | static void __net_exit netdev_exit(struct net *net) |
881d966b EB |
5633 | { |
5634 | kfree(net->dev_name_head); | |
5635 | kfree(net->dev_index_head); | |
5636 | } | |
5637 | ||
022cbae6 | 5638 | static struct pernet_operations __net_initdata netdev_net_ops = { |
881d966b EB |
5639 | .init = netdev_init, |
5640 | .exit = netdev_exit, | |
5641 | }; | |
5642 | ||
4665079c | 5643 | static void __net_exit default_device_exit(struct net *net) |
ce286d32 | 5644 | { |
8eb79863 | 5645 | struct net_device *dev; |
ce286d32 EB |
5646 | /* |
5647 | * Push all migratable of the network devices back to the | |
5648 | * initial network namespace | |
5649 | */ | |
5650 | rtnl_lock(); | |
8eb79863 EB |
5651 | restart: |
5652 | for_each_netdev(net, dev) { | |
ce286d32 | 5653 | int err; |
aca51397 | 5654 | char fb_name[IFNAMSIZ]; |
ce286d32 EB |
5655 | |
5656 | /* Ignore unmoveable devices (i.e. loopback) */ | |
5657 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
5658 | continue; | |
5659 | ||
d0c082ce EB |
5660 | /* Delete virtual devices */ |
5661 | if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink) { | |
23289a37 | 5662 | dev->rtnl_link_ops->dellink(dev, NULL); |
8eb79863 | 5663 | goto restart; |
d0c082ce EB |
5664 | } |
5665 | ||
ce286d32 | 5666 | /* Push remaing network devices to init_net */ |
aca51397 PE |
5667 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
5668 | err = dev_change_net_namespace(dev, &init_net, fb_name); | |
ce286d32 | 5669 | if (err) { |
aca51397 | 5670 | printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n", |
ce286d32 | 5671 | __func__, dev->name, err); |
aca51397 | 5672 | BUG(); |
ce286d32 | 5673 | } |
8eb79863 | 5674 | goto restart; |
ce286d32 EB |
5675 | } |
5676 | rtnl_unlock(); | |
5677 | } | |
5678 | ||
022cbae6 | 5679 | static struct pernet_operations __net_initdata default_device_ops = { |
ce286d32 EB |
5680 | .exit = default_device_exit, |
5681 | }; | |
5682 | ||
1da177e4 LT |
5683 | /* |
5684 | * Initialize the DEV module. At boot time this walks the device list and | |
5685 | * unhooks any devices that fail to initialise (normally hardware not | |
5686 | * present) and leaves us with a valid list of present and active devices. | |
5687 | * | |
5688 | */ | |
5689 | ||
5690 | /* | |
5691 | * This is called single threaded during boot, so no need | |
5692 | * to take the rtnl semaphore. | |
5693 | */ | |
5694 | static int __init net_dev_init(void) | |
5695 | { | |
5696 | int i, rc = -ENOMEM; | |
5697 | ||
5698 | BUG_ON(!dev_boot_phase); | |
5699 | ||
1da177e4 LT |
5700 | if (dev_proc_init()) |
5701 | goto out; | |
5702 | ||
8b41d188 | 5703 | if (netdev_kobject_init()) |
1da177e4 LT |
5704 | goto out; |
5705 | ||
5706 | INIT_LIST_HEAD(&ptype_all); | |
82d8a867 | 5707 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
1da177e4 LT |
5708 | INIT_LIST_HEAD(&ptype_base[i]); |
5709 | ||
881d966b EB |
5710 | if (register_pernet_subsys(&netdev_net_ops)) |
5711 | goto out; | |
1da177e4 LT |
5712 | |
5713 | /* | |
5714 | * Initialise the packet receive queues. | |
5715 | */ | |
5716 | ||
6f912042 | 5717 | for_each_possible_cpu(i) { |
1da177e4 LT |
5718 | struct softnet_data *queue; |
5719 | ||
5720 | queue = &per_cpu(softnet_data, i); | |
5721 | skb_queue_head_init(&queue->input_pkt_queue); | |
1da177e4 LT |
5722 | queue->completion_queue = NULL; |
5723 | INIT_LIST_HEAD(&queue->poll_list); | |
bea3348e SH |
5724 | |
5725 | queue->backlog.poll = process_backlog; | |
5726 | queue->backlog.weight = weight_p; | |
d565b0a1 | 5727 | queue->backlog.gro_list = NULL; |
4ae5544f | 5728 | queue->backlog.gro_count = 0; |
1da177e4 LT |
5729 | } |
5730 | ||
1da177e4 LT |
5731 | dev_boot_phase = 0; |
5732 | ||
505d4f73 EB |
5733 | /* The loopback device is special if any other network devices |
5734 | * is present in a network namespace the loopback device must | |
5735 | * be present. Since we now dynamically allocate and free the | |
5736 | * loopback device ensure this invariant is maintained by | |
5737 | * keeping the loopback device as the first device on the | |
5738 | * list of network devices. Ensuring the loopback devices | |
5739 | * is the first device that appears and the last network device | |
5740 | * that disappears. | |
5741 | */ | |
5742 | if (register_pernet_device(&loopback_net_ops)) | |
5743 | goto out; | |
5744 | ||
5745 | if (register_pernet_device(&default_device_ops)) | |
5746 | goto out; | |
5747 | ||
962cf36c CM |
5748 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
5749 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); | |
1da177e4 LT |
5750 | |
5751 | hotcpu_notifier(dev_cpu_callback, 0); | |
5752 | dst_init(); | |
5753 | dev_mcast_init(); | |
5754 | rc = 0; | |
5755 | out: | |
5756 | return rc; | |
5757 | } | |
5758 | ||
5759 | subsys_initcall(net_dev_init); | |
5760 | ||
e88721f8 KK |
5761 | static int __init initialize_hashrnd(void) |
5762 | { | |
5763 | get_random_bytes(&skb_tx_hashrnd, sizeof(skb_tx_hashrnd)); | |
5764 | return 0; | |
5765 | } | |
5766 | ||
5767 | late_initcall_sync(initialize_hashrnd); | |
5768 |