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Commit | Line | Data |
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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> | |
08e9897d | 82 | #include <linux/hash.h> |
5a0e3ad6 | 83 | #include <linux/slab.h> |
1da177e4 | 84 | #include <linux/sched.h> |
4a3e2f71 | 85 | #include <linux/mutex.h> |
1da177e4 LT |
86 | #include <linux/string.h> |
87 | #include <linux/mm.h> | |
88 | #include <linux/socket.h> | |
89 | #include <linux/sockios.h> | |
90 | #include <linux/errno.h> | |
91 | #include <linux/interrupt.h> | |
92 | #include <linux/if_ether.h> | |
93 | #include <linux/netdevice.h> | |
94 | #include <linux/etherdevice.h> | |
0187bdfb | 95 | #include <linux/ethtool.h> |
1da177e4 LT |
96 | #include <linux/notifier.h> |
97 | #include <linux/skbuff.h> | |
457c4cbc | 98 | #include <net/net_namespace.h> |
1da177e4 LT |
99 | #include <net/sock.h> |
100 | #include <linux/rtnetlink.h> | |
101 | #include <linux/proc_fs.h> | |
102 | #include <linux/seq_file.h> | |
103 | #include <linux/stat.h> | |
1da177e4 LT |
104 | #include <net/dst.h> |
105 | #include <net/pkt_sched.h> | |
106 | #include <net/checksum.h> | |
44540960 | 107 | #include <net/xfrm.h> |
1da177e4 LT |
108 | #include <linux/highmem.h> |
109 | #include <linux/init.h> | |
110 | #include <linux/kmod.h> | |
111 | #include <linux/module.h> | |
1da177e4 LT |
112 | #include <linux/netpoll.h> |
113 | #include <linux/rcupdate.h> | |
114 | #include <linux/delay.h> | |
295f4a1f | 115 | #include <net/wext.h> |
1da177e4 | 116 | #include <net/iw_handler.h> |
1da177e4 | 117 | #include <asm/current.h> |
5bdb9886 | 118 | #include <linux/audit.h> |
db217334 | 119 | #include <linux/dmaengine.h> |
f6a78bfc | 120 | #include <linux/err.h> |
c7fa9d18 | 121 | #include <linux/ctype.h> |
723e98b7 | 122 | #include <linux/if_arp.h> |
6de329e2 | 123 | #include <linux/if_vlan.h> |
8f0f2223 | 124 | #include <linux/ip.h> |
ad55dcaf | 125 | #include <net/ip.h> |
8f0f2223 DM |
126 | #include <linux/ipv6.h> |
127 | #include <linux/in.h> | |
b6b2fed1 DM |
128 | #include <linux/jhash.h> |
129 | #include <linux/random.h> | |
9cbc1cb8 | 130 | #include <trace/events/napi.h> |
cf66ba58 | 131 | #include <trace/events/net.h> |
07dc22e7 | 132 | #include <trace/events/skb.h> |
5acbbd42 | 133 | #include <linux/pci.h> |
caeda9b9 | 134 | #include <linux/inetdevice.h> |
c445477d | 135 | #include <linux/cpu_rmap.h> |
1da177e4 | 136 | |
342709ef PE |
137 | #include "net-sysfs.h" |
138 | ||
d565b0a1 HX |
139 | /* Instead of increasing this, you should create a hash table. */ |
140 | #define MAX_GRO_SKBS 8 | |
141 | ||
5d38a079 HX |
142 | /* This should be increased if a protocol with a bigger head is added. */ |
143 | #define GRO_MAX_HEAD (MAX_HEADER + 128) | |
144 | ||
1da177e4 LT |
145 | /* |
146 | * The list of packet types we will receive (as opposed to discard) | |
147 | * and the routines to invoke. | |
148 | * | |
149 | * Why 16. Because with 16 the only overlap we get on a hash of the | |
150 | * low nibble of the protocol value is RARP/SNAP/X.25. | |
151 | * | |
152 | * NOTE: That is no longer true with the addition of VLAN tags. Not | |
153 | * sure which should go first, but I bet it won't make much | |
154 | * difference if we are running VLANs. The good news is that | |
155 | * this protocol won't be in the list unless compiled in, so | |
3041a069 | 156 | * the average user (w/out VLANs) will not be adversely affected. |
1da177e4 LT |
157 | * --BLG |
158 | * | |
159 | * 0800 IP | |
160 | * 8100 802.1Q VLAN | |
161 | * 0001 802.3 | |
162 | * 0002 AX.25 | |
163 | * 0004 802.2 | |
164 | * 8035 RARP | |
165 | * 0005 SNAP | |
166 | * 0805 X.25 | |
167 | * 0806 ARP | |
168 | * 8137 IPX | |
169 | * 0009 Localtalk | |
170 | * 86DD IPv6 | |
171 | */ | |
172 | ||
82d8a867 PE |
173 | #define PTYPE_HASH_SIZE (16) |
174 | #define PTYPE_HASH_MASK (PTYPE_HASH_SIZE - 1) | |
175 | ||
1da177e4 | 176 | static DEFINE_SPINLOCK(ptype_lock); |
82d8a867 | 177 | static struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly; |
6b2bedc3 | 178 | static struct list_head ptype_all __read_mostly; /* Taps */ |
1da177e4 | 179 | |
1da177e4 | 180 | /* |
7562f876 | 181 | * The @dev_base_head list is protected by @dev_base_lock and the rtnl |
1da177e4 LT |
182 | * semaphore. |
183 | * | |
c6d14c84 | 184 | * Pure readers hold dev_base_lock for reading, or rcu_read_lock() |
1da177e4 LT |
185 | * |
186 | * Writers must hold the rtnl semaphore while they loop through the | |
7562f876 | 187 | * dev_base_head list, and hold dev_base_lock for writing when they do the |
1da177e4 LT |
188 | * actual updates. This allows pure readers to access the list even |
189 | * while a writer is preparing to update it. | |
190 | * | |
191 | * To put it another way, dev_base_lock is held for writing only to | |
192 | * protect against pure readers; the rtnl semaphore provides the | |
193 | * protection against other writers. | |
194 | * | |
195 | * See, for example usages, register_netdevice() and | |
196 | * unregister_netdevice(), which must be called with the rtnl | |
197 | * semaphore held. | |
198 | */ | |
1da177e4 | 199 | DEFINE_RWLOCK(dev_base_lock); |
1da177e4 LT |
200 | EXPORT_SYMBOL(dev_base_lock); |
201 | ||
881d966b | 202 | static inline struct hlist_head *dev_name_hash(struct net *net, const char *name) |
1da177e4 LT |
203 | { |
204 | unsigned hash = full_name_hash(name, strnlen(name, IFNAMSIZ)); | |
08e9897d | 205 | return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)]; |
1da177e4 LT |
206 | } |
207 | ||
881d966b | 208 | static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex) |
1da177e4 | 209 | { |
7c28bd0b | 210 | return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)]; |
1da177e4 LT |
211 | } |
212 | ||
e36fa2f7 | 213 | static inline void rps_lock(struct softnet_data *sd) |
152102c7 CG |
214 | { |
215 | #ifdef CONFIG_RPS | |
e36fa2f7 | 216 | spin_lock(&sd->input_pkt_queue.lock); |
152102c7 CG |
217 | #endif |
218 | } | |
219 | ||
e36fa2f7 | 220 | static inline void rps_unlock(struct softnet_data *sd) |
152102c7 CG |
221 | { |
222 | #ifdef CONFIG_RPS | |
e36fa2f7 | 223 | spin_unlock(&sd->input_pkt_queue.lock); |
152102c7 CG |
224 | #endif |
225 | } | |
226 | ||
ce286d32 EB |
227 | /* Device list insertion */ |
228 | static int list_netdevice(struct net_device *dev) | |
229 | { | |
c346dca1 | 230 | struct net *net = dev_net(dev); |
ce286d32 EB |
231 | |
232 | ASSERT_RTNL(); | |
233 | ||
234 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 235 | list_add_tail_rcu(&dev->dev_list, &net->dev_base_head); |
72c9528b | 236 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); |
fb699dfd ED |
237 | hlist_add_head_rcu(&dev->index_hlist, |
238 | dev_index_hash(net, dev->ifindex)); | |
ce286d32 EB |
239 | write_unlock_bh(&dev_base_lock); |
240 | return 0; | |
241 | } | |
242 | ||
fb699dfd ED |
243 | /* Device list removal |
244 | * caller must respect a RCU grace period before freeing/reusing dev | |
245 | */ | |
ce286d32 EB |
246 | static void unlist_netdevice(struct net_device *dev) |
247 | { | |
248 | ASSERT_RTNL(); | |
249 | ||
250 | /* Unlink dev from the device chain */ | |
251 | write_lock_bh(&dev_base_lock); | |
c6d14c84 | 252 | list_del_rcu(&dev->dev_list); |
72c9528b | 253 | hlist_del_rcu(&dev->name_hlist); |
fb699dfd | 254 | hlist_del_rcu(&dev->index_hlist); |
ce286d32 EB |
255 | write_unlock_bh(&dev_base_lock); |
256 | } | |
257 | ||
1da177e4 LT |
258 | /* |
259 | * Our notifier list | |
260 | */ | |
261 | ||
f07d5b94 | 262 | static RAW_NOTIFIER_HEAD(netdev_chain); |
1da177e4 LT |
263 | |
264 | /* | |
265 | * Device drivers call our routines to queue packets here. We empty the | |
266 | * queue in the local softnet handler. | |
267 | */ | |
bea3348e | 268 | |
9958da05 | 269 | DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data); |
d1b19dff | 270 | EXPORT_PER_CPU_SYMBOL(softnet_data); |
1da177e4 | 271 | |
cf508b12 | 272 | #ifdef CONFIG_LOCKDEP |
723e98b7 | 273 | /* |
c773e847 | 274 | * register_netdevice() inits txq->_xmit_lock and sets lockdep class |
723e98b7 JP |
275 | * according to dev->type |
276 | */ | |
277 | static const unsigned short netdev_lock_type[] = | |
278 | {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25, | |
279 | ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET, | |
280 | ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM, | |
281 | ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP, | |
282 | ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD, | |
283 | ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25, | |
284 | ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP, | |
285 | ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD, | |
286 | ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI, | |
287 | ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE, | |
288 | ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET, | |
289 | ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL, | |
290 | ARPHRD_FCFABRIC, ARPHRD_IEEE802_TR, ARPHRD_IEEE80211, | |
2d91d78b | 291 | ARPHRD_IEEE80211_PRISM, ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, |
929122cd | 292 | ARPHRD_PHONET_PIPE, ARPHRD_IEEE802154, |
fcb94e42 | 293 | ARPHRD_VOID, ARPHRD_NONE}; |
723e98b7 | 294 | |
36cbd3dc | 295 | static const char *const netdev_lock_name[] = |
723e98b7 JP |
296 | {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25", |
297 | "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET", | |
298 | "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM", | |
299 | "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP", | |
300 | "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD", | |
301 | "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25", | |
302 | "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP", | |
303 | "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD", | |
304 | "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI", | |
305 | "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE", | |
306 | "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET", | |
307 | "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL", | |
308 | "_xmit_FCFABRIC", "_xmit_IEEE802_TR", "_xmit_IEEE80211", | |
2d91d78b | 309 | "_xmit_IEEE80211_PRISM", "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", |
929122cd | 310 | "_xmit_PHONET_PIPE", "_xmit_IEEE802154", |
fcb94e42 | 311 | "_xmit_VOID", "_xmit_NONE"}; |
723e98b7 JP |
312 | |
313 | static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)]; | |
cf508b12 | 314 | static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)]; |
723e98b7 JP |
315 | |
316 | static inline unsigned short netdev_lock_pos(unsigned short dev_type) | |
317 | { | |
318 | int i; | |
319 | ||
320 | for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++) | |
321 | if (netdev_lock_type[i] == dev_type) | |
322 | return i; | |
323 | /* the last key is used by default */ | |
324 | return ARRAY_SIZE(netdev_lock_type) - 1; | |
325 | } | |
326 | ||
cf508b12 DM |
327 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
328 | unsigned short dev_type) | |
723e98b7 JP |
329 | { |
330 | int i; | |
331 | ||
332 | i = netdev_lock_pos(dev_type); | |
333 | lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i], | |
334 | netdev_lock_name[i]); | |
335 | } | |
cf508b12 DM |
336 | |
337 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
338 | { | |
339 | int i; | |
340 | ||
341 | i = netdev_lock_pos(dev->type); | |
342 | lockdep_set_class_and_name(&dev->addr_list_lock, | |
343 | &netdev_addr_lock_key[i], | |
344 | netdev_lock_name[i]); | |
345 | } | |
723e98b7 | 346 | #else |
cf508b12 DM |
347 | static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock, |
348 | unsigned short dev_type) | |
349 | { | |
350 | } | |
351 | static inline void netdev_set_addr_lockdep_class(struct net_device *dev) | |
723e98b7 JP |
352 | { |
353 | } | |
354 | #endif | |
1da177e4 LT |
355 | |
356 | /******************************************************************************* | |
357 | ||
358 | Protocol management and registration routines | |
359 | ||
360 | *******************************************************************************/ | |
361 | ||
1da177e4 LT |
362 | /* |
363 | * Add a protocol ID to the list. Now that the input handler is | |
364 | * smarter we can dispense with all the messy stuff that used to be | |
365 | * here. | |
366 | * | |
367 | * BEWARE!!! Protocol handlers, mangling input packets, | |
368 | * MUST BE last in hash buckets and checking protocol handlers | |
369 | * MUST start from promiscuous ptype_all chain in net_bh. | |
370 | * It is true now, do not change it. | |
371 | * Explanation follows: if protocol handler, mangling packet, will | |
372 | * be the first on list, it is not able to sense, that packet | |
373 | * is cloned and should be copied-on-write, so that it will | |
374 | * change it and subsequent readers will get broken packet. | |
375 | * --ANK (980803) | |
376 | */ | |
377 | ||
c07b68e8 ED |
378 | static inline struct list_head *ptype_head(const struct packet_type *pt) |
379 | { | |
380 | if (pt->type == htons(ETH_P_ALL)) | |
381 | return &ptype_all; | |
382 | else | |
383 | return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK]; | |
384 | } | |
385 | ||
1da177e4 LT |
386 | /** |
387 | * dev_add_pack - add packet handler | |
388 | * @pt: packet type declaration | |
389 | * | |
390 | * Add a protocol handler to the networking stack. The passed &packet_type | |
391 | * is linked into kernel lists and may not be freed until it has been | |
392 | * removed from the kernel lists. | |
393 | * | |
4ec93edb | 394 | * This call does not sleep therefore it can not |
1da177e4 LT |
395 | * guarantee all CPU's that are in middle of receiving packets |
396 | * will see the new packet type (until the next received packet). | |
397 | */ | |
398 | ||
399 | void dev_add_pack(struct packet_type *pt) | |
400 | { | |
c07b68e8 | 401 | struct list_head *head = ptype_head(pt); |
1da177e4 | 402 | |
c07b68e8 ED |
403 | spin_lock(&ptype_lock); |
404 | list_add_rcu(&pt->list, head); | |
405 | spin_unlock(&ptype_lock); | |
1da177e4 | 406 | } |
d1b19dff | 407 | EXPORT_SYMBOL(dev_add_pack); |
1da177e4 | 408 | |
1da177e4 LT |
409 | /** |
410 | * __dev_remove_pack - remove packet handler | |
411 | * @pt: packet type declaration | |
412 | * | |
413 | * Remove a protocol handler that was previously added to the kernel | |
414 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
415 | * from the kernel lists and can be freed or reused once this function | |
4ec93edb | 416 | * returns. |
1da177e4 LT |
417 | * |
418 | * The packet type might still be in use by receivers | |
419 | * and must not be freed until after all the CPU's have gone | |
420 | * through a quiescent state. | |
421 | */ | |
422 | void __dev_remove_pack(struct packet_type *pt) | |
423 | { | |
c07b68e8 | 424 | struct list_head *head = ptype_head(pt); |
1da177e4 LT |
425 | struct packet_type *pt1; |
426 | ||
c07b68e8 | 427 | spin_lock(&ptype_lock); |
1da177e4 LT |
428 | |
429 | list_for_each_entry(pt1, head, list) { | |
430 | if (pt == pt1) { | |
431 | list_del_rcu(&pt->list); | |
432 | goto out; | |
433 | } | |
434 | } | |
435 | ||
436 | printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt); | |
437 | out: | |
c07b68e8 | 438 | spin_unlock(&ptype_lock); |
1da177e4 | 439 | } |
d1b19dff ED |
440 | EXPORT_SYMBOL(__dev_remove_pack); |
441 | ||
1da177e4 LT |
442 | /** |
443 | * dev_remove_pack - remove packet handler | |
444 | * @pt: packet type declaration | |
445 | * | |
446 | * Remove a protocol handler that was previously added to the kernel | |
447 | * protocol handlers by dev_add_pack(). The passed &packet_type is removed | |
448 | * from the kernel lists and can be freed or reused once this function | |
449 | * returns. | |
450 | * | |
451 | * This call sleeps to guarantee that no CPU is looking at the packet | |
452 | * type after return. | |
453 | */ | |
454 | void dev_remove_pack(struct packet_type *pt) | |
455 | { | |
456 | __dev_remove_pack(pt); | |
4ec93edb | 457 | |
1da177e4 LT |
458 | synchronize_net(); |
459 | } | |
d1b19dff | 460 | EXPORT_SYMBOL(dev_remove_pack); |
1da177e4 LT |
461 | |
462 | /****************************************************************************** | |
463 | ||
464 | Device Boot-time Settings Routines | |
465 | ||
466 | *******************************************************************************/ | |
467 | ||
468 | /* Boot time configuration table */ | |
469 | static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX]; | |
470 | ||
471 | /** | |
472 | * netdev_boot_setup_add - add new setup entry | |
473 | * @name: name of the device | |
474 | * @map: configured settings for the device | |
475 | * | |
476 | * Adds new setup entry to the dev_boot_setup list. The function | |
477 | * returns 0 on error and 1 on success. This is a generic routine to | |
478 | * all netdevices. | |
479 | */ | |
480 | static int netdev_boot_setup_add(char *name, struct ifmap *map) | |
481 | { | |
482 | struct netdev_boot_setup *s; | |
483 | int i; | |
484 | ||
485 | s = dev_boot_setup; | |
486 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
487 | if (s[i].name[0] == '\0' || s[i].name[0] == ' ') { | |
488 | memset(s[i].name, 0, sizeof(s[i].name)); | |
93b3cff9 | 489 | strlcpy(s[i].name, name, IFNAMSIZ); |
1da177e4 LT |
490 | memcpy(&s[i].map, map, sizeof(s[i].map)); |
491 | break; | |
492 | } | |
493 | } | |
494 | ||
495 | return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1; | |
496 | } | |
497 | ||
498 | /** | |
499 | * netdev_boot_setup_check - check boot time settings | |
500 | * @dev: the netdevice | |
501 | * | |
502 | * Check boot time settings for the device. | |
503 | * The found settings are set for the device to be used | |
504 | * later in the device probing. | |
505 | * Returns 0 if no settings found, 1 if they are. | |
506 | */ | |
507 | int netdev_boot_setup_check(struct net_device *dev) | |
508 | { | |
509 | struct netdev_boot_setup *s = dev_boot_setup; | |
510 | int i; | |
511 | ||
512 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) { | |
513 | if (s[i].name[0] != '\0' && s[i].name[0] != ' ' && | |
93b3cff9 | 514 | !strcmp(dev->name, s[i].name)) { |
1da177e4 LT |
515 | dev->irq = s[i].map.irq; |
516 | dev->base_addr = s[i].map.base_addr; | |
517 | dev->mem_start = s[i].map.mem_start; | |
518 | dev->mem_end = s[i].map.mem_end; | |
519 | return 1; | |
520 | } | |
521 | } | |
522 | return 0; | |
523 | } | |
d1b19dff | 524 | EXPORT_SYMBOL(netdev_boot_setup_check); |
1da177e4 LT |
525 | |
526 | ||
527 | /** | |
528 | * netdev_boot_base - get address from boot time settings | |
529 | * @prefix: prefix for network device | |
530 | * @unit: id for network device | |
531 | * | |
532 | * Check boot time settings for the base address of device. | |
533 | * The found settings are set for the device to be used | |
534 | * later in the device probing. | |
535 | * Returns 0 if no settings found. | |
536 | */ | |
537 | unsigned long netdev_boot_base(const char *prefix, int unit) | |
538 | { | |
539 | const struct netdev_boot_setup *s = dev_boot_setup; | |
540 | char name[IFNAMSIZ]; | |
541 | int i; | |
542 | ||
543 | sprintf(name, "%s%d", prefix, unit); | |
544 | ||
545 | /* | |
546 | * If device already registered then return base of 1 | |
547 | * to indicate not to probe for this interface | |
548 | */ | |
881d966b | 549 | if (__dev_get_by_name(&init_net, name)) |
1da177e4 LT |
550 | return 1; |
551 | ||
552 | for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) | |
553 | if (!strcmp(name, s[i].name)) | |
554 | return s[i].map.base_addr; | |
555 | return 0; | |
556 | } | |
557 | ||
558 | /* | |
559 | * Saves at boot time configured settings for any netdevice. | |
560 | */ | |
561 | int __init netdev_boot_setup(char *str) | |
562 | { | |
563 | int ints[5]; | |
564 | struct ifmap map; | |
565 | ||
566 | str = get_options(str, ARRAY_SIZE(ints), ints); | |
567 | if (!str || !*str) | |
568 | return 0; | |
569 | ||
570 | /* Save settings */ | |
571 | memset(&map, 0, sizeof(map)); | |
572 | if (ints[0] > 0) | |
573 | map.irq = ints[1]; | |
574 | if (ints[0] > 1) | |
575 | map.base_addr = ints[2]; | |
576 | if (ints[0] > 2) | |
577 | map.mem_start = ints[3]; | |
578 | if (ints[0] > 3) | |
579 | map.mem_end = ints[4]; | |
580 | ||
581 | /* Add new entry to the list */ | |
582 | return netdev_boot_setup_add(str, &map); | |
583 | } | |
584 | ||
585 | __setup("netdev=", netdev_boot_setup); | |
586 | ||
587 | /******************************************************************************* | |
588 | ||
589 | Device Interface Subroutines | |
590 | ||
591 | *******************************************************************************/ | |
592 | ||
593 | /** | |
594 | * __dev_get_by_name - find a device by its name | |
c4ea43c5 | 595 | * @net: the applicable net namespace |
1da177e4 LT |
596 | * @name: name to find |
597 | * | |
598 | * Find an interface by name. Must be called under RTNL semaphore | |
599 | * or @dev_base_lock. If the name is found a pointer to the device | |
600 | * is returned. If the name is not found then %NULL is returned. The | |
601 | * reference counters are not incremented so the caller must be | |
602 | * careful with locks. | |
603 | */ | |
604 | ||
881d966b | 605 | struct net_device *__dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
606 | { |
607 | struct hlist_node *p; | |
0bd8d536 ED |
608 | struct net_device *dev; |
609 | struct hlist_head *head = dev_name_hash(net, name); | |
1da177e4 | 610 | |
0bd8d536 | 611 | hlist_for_each_entry(dev, p, head, name_hlist) |
1da177e4 LT |
612 | if (!strncmp(dev->name, name, IFNAMSIZ)) |
613 | return dev; | |
0bd8d536 | 614 | |
1da177e4 LT |
615 | return NULL; |
616 | } | |
d1b19dff | 617 | EXPORT_SYMBOL(__dev_get_by_name); |
1da177e4 | 618 | |
72c9528b ED |
619 | /** |
620 | * dev_get_by_name_rcu - find a device by its name | |
621 | * @net: the applicable net namespace | |
622 | * @name: name to find | |
623 | * | |
624 | * Find an interface by name. | |
625 | * If the name is found a pointer to the device is returned. | |
626 | * If the name is not found then %NULL is returned. | |
627 | * The reference counters are not incremented so the caller must be | |
628 | * careful with locks. The caller must hold RCU lock. | |
629 | */ | |
630 | ||
631 | struct net_device *dev_get_by_name_rcu(struct net *net, const char *name) | |
632 | { | |
633 | struct hlist_node *p; | |
634 | struct net_device *dev; | |
635 | struct hlist_head *head = dev_name_hash(net, name); | |
636 | ||
637 | hlist_for_each_entry_rcu(dev, p, head, name_hlist) | |
638 | if (!strncmp(dev->name, name, IFNAMSIZ)) | |
639 | return dev; | |
640 | ||
641 | return NULL; | |
642 | } | |
643 | EXPORT_SYMBOL(dev_get_by_name_rcu); | |
644 | ||
1da177e4 LT |
645 | /** |
646 | * dev_get_by_name - find a device by its name | |
c4ea43c5 | 647 | * @net: the applicable net namespace |
1da177e4 LT |
648 | * @name: name to find |
649 | * | |
650 | * Find an interface by name. This can be called from any | |
651 | * context and does its own locking. The returned handle has | |
652 | * the usage count incremented and the caller must use dev_put() to | |
653 | * release it when it is no longer needed. %NULL is returned if no | |
654 | * matching device is found. | |
655 | */ | |
656 | ||
881d966b | 657 | struct net_device *dev_get_by_name(struct net *net, const char *name) |
1da177e4 LT |
658 | { |
659 | struct net_device *dev; | |
660 | ||
72c9528b ED |
661 | rcu_read_lock(); |
662 | dev = dev_get_by_name_rcu(net, name); | |
1da177e4 LT |
663 | if (dev) |
664 | dev_hold(dev); | |
72c9528b | 665 | rcu_read_unlock(); |
1da177e4 LT |
666 | return dev; |
667 | } | |
d1b19dff | 668 | EXPORT_SYMBOL(dev_get_by_name); |
1da177e4 LT |
669 | |
670 | /** | |
671 | * __dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 672 | * @net: the applicable net namespace |
1da177e4 LT |
673 | * @ifindex: index of device |
674 | * | |
675 | * Search for an interface by index. Returns %NULL if the device | |
676 | * is not found or a pointer to the device. The device has not | |
677 | * had its reference counter increased so the caller must be careful | |
678 | * about locking. The caller must hold either the RTNL semaphore | |
679 | * or @dev_base_lock. | |
680 | */ | |
681 | ||
881d966b | 682 | struct net_device *__dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
683 | { |
684 | struct hlist_node *p; | |
0bd8d536 ED |
685 | struct net_device *dev; |
686 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
1da177e4 | 687 | |
0bd8d536 | 688 | hlist_for_each_entry(dev, p, head, index_hlist) |
1da177e4 LT |
689 | if (dev->ifindex == ifindex) |
690 | return dev; | |
0bd8d536 | 691 | |
1da177e4 LT |
692 | return NULL; |
693 | } | |
d1b19dff | 694 | EXPORT_SYMBOL(__dev_get_by_index); |
1da177e4 | 695 | |
fb699dfd ED |
696 | /** |
697 | * dev_get_by_index_rcu - find a device by its ifindex | |
698 | * @net: the applicable net namespace | |
699 | * @ifindex: index of device | |
700 | * | |
701 | * Search for an interface by index. Returns %NULL if the device | |
702 | * is not found or a pointer to the device. The device has not | |
703 | * had its reference counter increased so the caller must be careful | |
704 | * about locking. The caller must hold RCU lock. | |
705 | */ | |
706 | ||
707 | struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex) | |
708 | { | |
709 | struct hlist_node *p; | |
710 | struct net_device *dev; | |
711 | struct hlist_head *head = dev_index_hash(net, ifindex); | |
712 | ||
713 | hlist_for_each_entry_rcu(dev, p, head, index_hlist) | |
714 | if (dev->ifindex == ifindex) | |
715 | return dev; | |
716 | ||
717 | return NULL; | |
718 | } | |
719 | EXPORT_SYMBOL(dev_get_by_index_rcu); | |
720 | ||
1da177e4 LT |
721 | |
722 | /** | |
723 | * dev_get_by_index - find a device by its ifindex | |
c4ea43c5 | 724 | * @net: the applicable net namespace |
1da177e4 LT |
725 | * @ifindex: index of device |
726 | * | |
727 | * Search for an interface by index. Returns NULL if the device | |
728 | * is not found or a pointer to the device. The device returned has | |
729 | * had a reference added and the pointer is safe until the user calls | |
730 | * dev_put to indicate they have finished with it. | |
731 | */ | |
732 | ||
881d966b | 733 | struct net_device *dev_get_by_index(struct net *net, int ifindex) |
1da177e4 LT |
734 | { |
735 | struct net_device *dev; | |
736 | ||
fb699dfd ED |
737 | rcu_read_lock(); |
738 | dev = dev_get_by_index_rcu(net, ifindex); | |
1da177e4 LT |
739 | if (dev) |
740 | dev_hold(dev); | |
fb699dfd | 741 | rcu_read_unlock(); |
1da177e4 LT |
742 | return dev; |
743 | } | |
d1b19dff | 744 | EXPORT_SYMBOL(dev_get_by_index); |
1da177e4 LT |
745 | |
746 | /** | |
941666c2 | 747 | * dev_getbyhwaddr_rcu - find a device by its hardware address |
c4ea43c5 | 748 | * @net: the applicable net namespace |
1da177e4 LT |
749 | * @type: media type of device |
750 | * @ha: hardware address | |
751 | * | |
752 | * Search for an interface by MAC address. Returns NULL if the device | |
c506653d ED |
753 | * is not found or a pointer to the device. |
754 | * The caller must hold RCU or RTNL. | |
941666c2 | 755 | * The returned device has not had its ref count increased |
1da177e4 LT |
756 | * and the caller must therefore be careful about locking |
757 | * | |
1da177e4 LT |
758 | */ |
759 | ||
941666c2 ED |
760 | struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type, |
761 | const char *ha) | |
1da177e4 LT |
762 | { |
763 | struct net_device *dev; | |
764 | ||
941666c2 | 765 | for_each_netdev_rcu(net, dev) |
1da177e4 LT |
766 | if (dev->type == type && |
767 | !memcmp(dev->dev_addr, ha, dev->addr_len)) | |
7562f876 PE |
768 | return dev; |
769 | ||
770 | return NULL; | |
1da177e4 | 771 | } |
941666c2 | 772 | EXPORT_SYMBOL(dev_getbyhwaddr_rcu); |
cf309e3f | 773 | |
881d966b | 774 | struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type) |
1da177e4 LT |
775 | { |
776 | struct net_device *dev; | |
777 | ||
4e9cac2b | 778 | ASSERT_RTNL(); |
881d966b | 779 | for_each_netdev(net, dev) |
4e9cac2b | 780 | if (dev->type == type) |
7562f876 PE |
781 | return dev; |
782 | ||
783 | return NULL; | |
4e9cac2b | 784 | } |
4e9cac2b PM |
785 | EXPORT_SYMBOL(__dev_getfirstbyhwtype); |
786 | ||
881d966b | 787 | struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type) |
4e9cac2b | 788 | { |
99fe3c39 | 789 | struct net_device *dev, *ret = NULL; |
4e9cac2b | 790 | |
99fe3c39 ED |
791 | rcu_read_lock(); |
792 | for_each_netdev_rcu(net, dev) | |
793 | if (dev->type == type) { | |
794 | dev_hold(dev); | |
795 | ret = dev; | |
796 | break; | |
797 | } | |
798 | rcu_read_unlock(); | |
799 | return ret; | |
1da177e4 | 800 | } |
1da177e4 LT |
801 | EXPORT_SYMBOL(dev_getfirstbyhwtype); |
802 | ||
803 | /** | |
bb69ae04 | 804 | * dev_get_by_flags_rcu - find any device with given flags |
c4ea43c5 | 805 | * @net: the applicable net namespace |
1da177e4 LT |
806 | * @if_flags: IFF_* values |
807 | * @mask: bitmask of bits in if_flags to check | |
808 | * | |
809 | * Search for any interface with the given flags. Returns NULL if a device | |
bb69ae04 ED |
810 | * is not found or a pointer to the device. Must be called inside |
811 | * rcu_read_lock(), and result refcount is unchanged. | |
1da177e4 LT |
812 | */ |
813 | ||
bb69ae04 | 814 | struct net_device *dev_get_by_flags_rcu(struct net *net, unsigned short if_flags, |
d1b19dff | 815 | unsigned short mask) |
1da177e4 | 816 | { |
7562f876 | 817 | struct net_device *dev, *ret; |
1da177e4 | 818 | |
7562f876 | 819 | ret = NULL; |
c6d14c84 | 820 | for_each_netdev_rcu(net, dev) { |
1da177e4 | 821 | if (((dev->flags ^ if_flags) & mask) == 0) { |
7562f876 | 822 | ret = dev; |
1da177e4 LT |
823 | break; |
824 | } | |
825 | } | |
7562f876 | 826 | return ret; |
1da177e4 | 827 | } |
bb69ae04 | 828 | EXPORT_SYMBOL(dev_get_by_flags_rcu); |
1da177e4 LT |
829 | |
830 | /** | |
831 | * dev_valid_name - check if name is okay for network device | |
832 | * @name: name string | |
833 | * | |
834 | * Network device names need to be valid file names to | |
c7fa9d18 DM |
835 | * to allow sysfs to work. We also disallow any kind of |
836 | * whitespace. | |
1da177e4 | 837 | */ |
c2373ee9 | 838 | int dev_valid_name(const char *name) |
1da177e4 | 839 | { |
c7fa9d18 DM |
840 | if (*name == '\0') |
841 | return 0; | |
b6fe17d6 SH |
842 | if (strlen(name) >= IFNAMSIZ) |
843 | return 0; | |
c7fa9d18 DM |
844 | if (!strcmp(name, ".") || !strcmp(name, "..")) |
845 | return 0; | |
846 | ||
847 | while (*name) { | |
848 | if (*name == '/' || isspace(*name)) | |
849 | return 0; | |
850 | name++; | |
851 | } | |
852 | return 1; | |
1da177e4 | 853 | } |
d1b19dff | 854 | EXPORT_SYMBOL(dev_valid_name); |
1da177e4 LT |
855 | |
856 | /** | |
b267b179 EB |
857 | * __dev_alloc_name - allocate a name for a device |
858 | * @net: network namespace to allocate the device name in | |
1da177e4 | 859 | * @name: name format string |
b267b179 | 860 | * @buf: scratch buffer and result name string |
1da177e4 LT |
861 | * |
862 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
3041a069 SH |
863 | * id. It scans list of devices to build up a free map, then chooses |
864 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
865 | * while allocating the name and adding the device in order to avoid | |
866 | * duplicates. | |
867 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
868 | * Returns the number of the unit assigned or a negative errno code. | |
1da177e4 LT |
869 | */ |
870 | ||
b267b179 | 871 | static int __dev_alloc_name(struct net *net, const char *name, char *buf) |
1da177e4 LT |
872 | { |
873 | int i = 0; | |
1da177e4 LT |
874 | const char *p; |
875 | const int max_netdevices = 8*PAGE_SIZE; | |
cfcabdcc | 876 | unsigned long *inuse; |
1da177e4 LT |
877 | struct net_device *d; |
878 | ||
879 | p = strnchr(name, IFNAMSIZ-1, '%'); | |
880 | if (p) { | |
881 | /* | |
882 | * Verify the string as this thing may have come from | |
883 | * the user. There must be either one "%d" and no other "%" | |
884 | * characters. | |
885 | */ | |
886 | if (p[1] != 'd' || strchr(p + 2, '%')) | |
887 | return -EINVAL; | |
888 | ||
889 | /* Use one page as a bit array of possible slots */ | |
cfcabdcc | 890 | inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC); |
1da177e4 LT |
891 | if (!inuse) |
892 | return -ENOMEM; | |
893 | ||
881d966b | 894 | for_each_netdev(net, d) { |
1da177e4 LT |
895 | if (!sscanf(d->name, name, &i)) |
896 | continue; | |
897 | if (i < 0 || i >= max_netdevices) | |
898 | continue; | |
899 | ||
900 | /* avoid cases where sscanf is not exact inverse of printf */ | |
b267b179 | 901 | snprintf(buf, IFNAMSIZ, name, i); |
1da177e4 LT |
902 | if (!strncmp(buf, d->name, IFNAMSIZ)) |
903 | set_bit(i, inuse); | |
904 | } | |
905 | ||
906 | i = find_first_zero_bit(inuse, max_netdevices); | |
907 | free_page((unsigned long) inuse); | |
908 | } | |
909 | ||
d9031024 OP |
910 | if (buf != name) |
911 | snprintf(buf, IFNAMSIZ, name, i); | |
b267b179 | 912 | if (!__dev_get_by_name(net, buf)) |
1da177e4 | 913 | return i; |
1da177e4 LT |
914 | |
915 | /* It is possible to run out of possible slots | |
916 | * when the name is long and there isn't enough space left | |
917 | * for the digits, or if all bits are used. | |
918 | */ | |
919 | return -ENFILE; | |
920 | } | |
921 | ||
b267b179 EB |
922 | /** |
923 | * dev_alloc_name - allocate a name for a device | |
924 | * @dev: device | |
925 | * @name: name format string | |
926 | * | |
927 | * Passed a format string - eg "lt%d" it will try and find a suitable | |
928 | * id. It scans list of devices to build up a free map, then chooses | |
929 | * the first empty slot. The caller must hold the dev_base or rtnl lock | |
930 | * while allocating the name and adding the device in order to avoid | |
931 | * duplicates. | |
932 | * Limited to bits_per_byte * page size devices (ie 32K on most platforms). | |
933 | * Returns the number of the unit assigned or a negative errno code. | |
934 | */ | |
935 | ||
936 | int dev_alloc_name(struct net_device *dev, const char *name) | |
937 | { | |
938 | char buf[IFNAMSIZ]; | |
939 | struct net *net; | |
940 | int ret; | |
941 | ||
c346dca1 YH |
942 | BUG_ON(!dev_net(dev)); |
943 | net = dev_net(dev); | |
b267b179 EB |
944 | ret = __dev_alloc_name(net, name, buf); |
945 | if (ret >= 0) | |
946 | strlcpy(dev->name, buf, IFNAMSIZ); | |
947 | return ret; | |
948 | } | |
d1b19dff | 949 | EXPORT_SYMBOL(dev_alloc_name); |
b267b179 | 950 | |
8ce6cebc | 951 | static int dev_get_valid_name(struct net_device *dev, const char *name, bool fmt) |
d9031024 | 952 | { |
8ce6cebc DL |
953 | struct net *net; |
954 | ||
955 | BUG_ON(!dev_net(dev)); | |
956 | net = dev_net(dev); | |
957 | ||
d9031024 OP |
958 | if (!dev_valid_name(name)) |
959 | return -EINVAL; | |
960 | ||
961 | if (fmt && strchr(name, '%')) | |
8ce6cebc | 962 | return dev_alloc_name(dev, name); |
d9031024 OP |
963 | else if (__dev_get_by_name(net, name)) |
964 | return -EEXIST; | |
8ce6cebc DL |
965 | else if (dev->name != name) |
966 | strlcpy(dev->name, name, IFNAMSIZ); | |
d9031024 OP |
967 | |
968 | return 0; | |
969 | } | |
1da177e4 LT |
970 | |
971 | /** | |
972 | * dev_change_name - change name of a device | |
973 | * @dev: device | |
974 | * @newname: name (or format string) must be at least IFNAMSIZ | |
975 | * | |
976 | * Change name of a device, can pass format strings "eth%d". | |
977 | * for wildcarding. | |
978 | */ | |
cf04a4c7 | 979 | int dev_change_name(struct net_device *dev, const char *newname) |
1da177e4 | 980 | { |
fcc5a03a | 981 | char oldname[IFNAMSIZ]; |
1da177e4 | 982 | int err = 0; |
fcc5a03a | 983 | int ret; |
881d966b | 984 | struct net *net; |
1da177e4 LT |
985 | |
986 | ASSERT_RTNL(); | |
c346dca1 | 987 | BUG_ON(!dev_net(dev)); |
1da177e4 | 988 | |
c346dca1 | 989 | net = dev_net(dev); |
1da177e4 LT |
990 | if (dev->flags & IFF_UP) |
991 | return -EBUSY; | |
992 | ||
c8d90dca SH |
993 | if (strncmp(newname, dev->name, IFNAMSIZ) == 0) |
994 | return 0; | |
995 | ||
fcc5a03a HX |
996 | memcpy(oldname, dev->name, IFNAMSIZ); |
997 | ||
8ce6cebc | 998 | err = dev_get_valid_name(dev, newname, 1); |
d9031024 OP |
999 | if (err < 0) |
1000 | return err; | |
1da177e4 | 1001 | |
fcc5a03a | 1002 | rollback: |
a1b3f594 EB |
1003 | ret = device_rename(&dev->dev, dev->name); |
1004 | if (ret) { | |
1005 | memcpy(dev->name, oldname, IFNAMSIZ); | |
1006 | return ret; | |
dcc99773 | 1007 | } |
7f988eab HX |
1008 | |
1009 | write_lock_bh(&dev_base_lock); | |
92749821 | 1010 | hlist_del(&dev->name_hlist); |
72c9528b ED |
1011 | write_unlock_bh(&dev_base_lock); |
1012 | ||
1013 | synchronize_rcu(); | |
1014 | ||
1015 | write_lock_bh(&dev_base_lock); | |
1016 | hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name)); | |
7f988eab HX |
1017 | write_unlock_bh(&dev_base_lock); |
1018 | ||
056925ab | 1019 | ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev); |
fcc5a03a HX |
1020 | ret = notifier_to_errno(ret); |
1021 | ||
1022 | if (ret) { | |
91e9c07b ED |
1023 | /* err >= 0 after dev_alloc_name() or stores the first errno */ |
1024 | if (err >= 0) { | |
fcc5a03a HX |
1025 | err = ret; |
1026 | memcpy(dev->name, oldname, IFNAMSIZ); | |
1027 | goto rollback; | |
91e9c07b ED |
1028 | } else { |
1029 | printk(KERN_ERR | |
1030 | "%s: name change rollback failed: %d.\n", | |
1031 | dev->name, ret); | |
fcc5a03a HX |
1032 | } |
1033 | } | |
1da177e4 LT |
1034 | |
1035 | return err; | |
1036 | } | |
1037 | ||
0b815a1a SH |
1038 | /** |
1039 | * dev_set_alias - change ifalias of a device | |
1040 | * @dev: device | |
1041 | * @alias: name up to IFALIASZ | |
f0db275a | 1042 | * @len: limit of bytes to copy from info |
0b815a1a SH |
1043 | * |
1044 | * Set ifalias for a device, | |
1045 | */ | |
1046 | int dev_set_alias(struct net_device *dev, const char *alias, size_t len) | |
1047 | { | |
1048 | ASSERT_RTNL(); | |
1049 | ||
1050 | if (len >= IFALIASZ) | |
1051 | return -EINVAL; | |
1052 | ||
96ca4a2c OH |
1053 | if (!len) { |
1054 | if (dev->ifalias) { | |
1055 | kfree(dev->ifalias); | |
1056 | dev->ifalias = NULL; | |
1057 | } | |
1058 | return 0; | |
1059 | } | |
1060 | ||
d1b19dff | 1061 | dev->ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL); |
0b815a1a SH |
1062 | if (!dev->ifalias) |
1063 | return -ENOMEM; | |
1064 | ||
1065 | strlcpy(dev->ifalias, alias, len+1); | |
1066 | return len; | |
1067 | } | |
1068 | ||
1069 | ||
d8a33ac4 | 1070 | /** |
3041a069 | 1071 | * netdev_features_change - device changes features |
d8a33ac4 SH |
1072 | * @dev: device to cause notification |
1073 | * | |
1074 | * Called to indicate a device has changed features. | |
1075 | */ | |
1076 | void netdev_features_change(struct net_device *dev) | |
1077 | { | |
056925ab | 1078 | call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev); |
d8a33ac4 SH |
1079 | } |
1080 | EXPORT_SYMBOL(netdev_features_change); | |
1081 | ||
1da177e4 LT |
1082 | /** |
1083 | * netdev_state_change - device changes state | |
1084 | * @dev: device to cause notification | |
1085 | * | |
1086 | * Called to indicate a device has changed state. This function calls | |
1087 | * the notifier chains for netdev_chain and sends a NEWLINK message | |
1088 | * to the routing socket. | |
1089 | */ | |
1090 | void netdev_state_change(struct net_device *dev) | |
1091 | { | |
1092 | if (dev->flags & IFF_UP) { | |
056925ab | 1093 | call_netdevice_notifiers(NETDEV_CHANGE, dev); |
1da177e4 LT |
1094 | rtmsg_ifinfo(RTM_NEWLINK, dev, 0); |
1095 | } | |
1096 | } | |
d1b19dff | 1097 | EXPORT_SYMBOL(netdev_state_change); |
1da177e4 | 1098 | |
3ca5b404 | 1099 | int netdev_bonding_change(struct net_device *dev, unsigned long event) |
c1da4ac7 | 1100 | { |
3ca5b404 | 1101 | return call_netdevice_notifiers(event, dev); |
c1da4ac7 OG |
1102 | } |
1103 | EXPORT_SYMBOL(netdev_bonding_change); | |
1104 | ||
1da177e4 LT |
1105 | /** |
1106 | * dev_load - load a network module | |
c4ea43c5 | 1107 | * @net: the applicable net namespace |
1da177e4 LT |
1108 | * @name: name of interface |
1109 | * | |
1110 | * If a network interface is not present and the process has suitable | |
1111 | * privileges this function loads the module. If module loading is not | |
1112 | * available in this kernel then it becomes a nop. | |
1113 | */ | |
1114 | ||
881d966b | 1115 | void dev_load(struct net *net, const char *name) |
1da177e4 | 1116 | { |
4ec93edb | 1117 | struct net_device *dev; |
1da177e4 | 1118 | |
72c9528b ED |
1119 | rcu_read_lock(); |
1120 | dev = dev_get_by_name_rcu(net, name); | |
1121 | rcu_read_unlock(); | |
1da177e4 | 1122 | |
a8f80e8f | 1123 | if (!dev && capable(CAP_NET_ADMIN)) |
1da177e4 LT |
1124 | request_module("%s", name); |
1125 | } | |
d1b19dff | 1126 | EXPORT_SYMBOL(dev_load); |
1da177e4 | 1127 | |
bd380811 | 1128 | static int __dev_open(struct net_device *dev) |
1da177e4 | 1129 | { |
d314774c | 1130 | const struct net_device_ops *ops = dev->netdev_ops; |
3b8bcfd5 | 1131 | int ret; |
1da177e4 | 1132 | |
e46b66bc BH |
1133 | ASSERT_RTNL(); |
1134 | ||
1da177e4 LT |
1135 | /* |
1136 | * Is it even present? | |
1137 | */ | |
1138 | if (!netif_device_present(dev)) | |
1139 | return -ENODEV; | |
1140 | ||
3b8bcfd5 JB |
1141 | ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev); |
1142 | ret = notifier_to_errno(ret); | |
1143 | if (ret) | |
1144 | return ret; | |
1145 | ||
1da177e4 LT |
1146 | /* |
1147 | * Call device private open method | |
1148 | */ | |
1149 | set_bit(__LINK_STATE_START, &dev->state); | |
bada339b | 1150 | |
d314774c SH |
1151 | if (ops->ndo_validate_addr) |
1152 | ret = ops->ndo_validate_addr(dev); | |
bada339b | 1153 | |
d314774c SH |
1154 | if (!ret && ops->ndo_open) |
1155 | ret = ops->ndo_open(dev); | |
1da177e4 | 1156 | |
4ec93edb | 1157 | /* |
1da177e4 LT |
1158 | * If it went open OK then: |
1159 | */ | |
1160 | ||
bada339b JG |
1161 | if (ret) |
1162 | clear_bit(__LINK_STATE_START, &dev->state); | |
1163 | else { | |
1da177e4 LT |
1164 | /* |
1165 | * Set the flags. | |
1166 | */ | |
1167 | dev->flags |= IFF_UP; | |
1168 | ||
649274d9 DW |
1169 | /* |
1170 | * Enable NET_DMA | |
1171 | */ | |
b4bd07c2 | 1172 | net_dmaengine_get(); |
649274d9 | 1173 | |
1da177e4 LT |
1174 | /* |
1175 | * Initialize multicasting status | |
1176 | */ | |
4417da66 | 1177 | dev_set_rx_mode(dev); |
1da177e4 LT |
1178 | |
1179 | /* | |
1180 | * Wakeup transmit queue engine | |
1181 | */ | |
1182 | dev_activate(dev); | |
1da177e4 | 1183 | } |
bada339b | 1184 | |
1da177e4 LT |
1185 | return ret; |
1186 | } | |
1187 | ||
1188 | /** | |
bd380811 PM |
1189 | * dev_open - prepare an interface for use. |
1190 | * @dev: device to open | |
1da177e4 | 1191 | * |
bd380811 PM |
1192 | * Takes a device from down to up state. The device's private open |
1193 | * function is invoked and then the multicast lists are loaded. Finally | |
1194 | * the device is moved into the up state and a %NETDEV_UP message is | |
1195 | * sent to the netdev notifier chain. | |
1196 | * | |
1197 | * Calling this function on an active interface is a nop. On a failure | |
1198 | * a negative errno code is returned. | |
1da177e4 | 1199 | */ |
bd380811 PM |
1200 | int dev_open(struct net_device *dev) |
1201 | { | |
1202 | int ret; | |
1203 | ||
1204 | /* | |
1205 | * Is it already up? | |
1206 | */ | |
1207 | if (dev->flags & IFF_UP) | |
1208 | return 0; | |
1209 | ||
1210 | /* | |
1211 | * Open device | |
1212 | */ | |
1213 | ret = __dev_open(dev); | |
1214 | if (ret < 0) | |
1215 | return ret; | |
1216 | ||
1217 | /* | |
1218 | * ... and announce new interface. | |
1219 | */ | |
1220 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); | |
1221 | call_netdevice_notifiers(NETDEV_UP, dev); | |
1222 | ||
1223 | return ret; | |
1224 | } | |
1225 | EXPORT_SYMBOL(dev_open); | |
1226 | ||
44345724 | 1227 | static int __dev_close_many(struct list_head *head) |
1da177e4 | 1228 | { |
44345724 | 1229 | struct net_device *dev; |
e46b66bc | 1230 | |
bd380811 | 1231 | ASSERT_RTNL(); |
9d5010db DM |
1232 | might_sleep(); |
1233 | ||
44345724 OP |
1234 | list_for_each_entry(dev, head, unreg_list) { |
1235 | /* | |
1236 | * Tell people we are going down, so that they can | |
1237 | * prepare to death, when device is still operating. | |
1238 | */ | |
1239 | call_netdevice_notifiers(NETDEV_GOING_DOWN, dev); | |
1da177e4 | 1240 | |
44345724 | 1241 | clear_bit(__LINK_STATE_START, &dev->state); |
1da177e4 | 1242 | |
44345724 OP |
1243 | /* Synchronize to scheduled poll. We cannot touch poll list, it |
1244 | * can be even on different cpu. So just clear netif_running(). | |
1245 | * | |
1246 | * dev->stop() will invoke napi_disable() on all of it's | |
1247 | * napi_struct instances on this device. | |
1248 | */ | |
1249 | smp_mb__after_clear_bit(); /* Commit netif_running(). */ | |
1250 | } | |
1da177e4 | 1251 | |
44345724 | 1252 | dev_deactivate_many(head); |
d8b2a4d2 | 1253 | |
44345724 OP |
1254 | list_for_each_entry(dev, head, unreg_list) { |
1255 | const struct net_device_ops *ops = dev->netdev_ops; | |
1da177e4 | 1256 | |
44345724 OP |
1257 | /* |
1258 | * Call the device specific close. This cannot fail. | |
1259 | * Only if device is UP | |
1260 | * | |
1261 | * We allow it to be called even after a DETACH hot-plug | |
1262 | * event. | |
1263 | */ | |
1264 | if (ops->ndo_stop) | |
1265 | ops->ndo_stop(dev); | |
1266 | ||
1267 | /* | |
1268 | * Device is now down. | |
1269 | */ | |
1270 | ||
1271 | dev->flags &= ~IFF_UP; | |
1272 | ||
1273 | /* | |
1274 | * Shutdown NET_DMA | |
1275 | */ | |
1276 | net_dmaengine_put(); | |
1277 | } | |
1278 | ||
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | static int __dev_close(struct net_device *dev) | |
1283 | { | |
1284 | LIST_HEAD(single); | |
1285 | ||
1286 | list_add(&dev->unreg_list, &single); | |
1287 | return __dev_close_many(&single); | |
1288 | } | |
1289 | ||
3fbd8758 | 1290 | static int dev_close_many(struct list_head *head) |
44345724 OP |
1291 | { |
1292 | struct net_device *dev, *tmp; | |
1293 | LIST_HEAD(tmp_list); | |
1da177e4 | 1294 | |
44345724 OP |
1295 | list_for_each_entry_safe(dev, tmp, head, unreg_list) |
1296 | if (!(dev->flags & IFF_UP)) | |
1297 | list_move(&dev->unreg_list, &tmp_list); | |
1298 | ||
1299 | __dev_close_many(head); | |
1da177e4 LT |
1300 | |
1301 | /* | |
44345724 | 1302 | * Tell people we are down |
1da177e4 | 1303 | */ |
44345724 OP |
1304 | list_for_each_entry(dev, head, unreg_list) { |
1305 | rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING); | |
1306 | call_netdevice_notifiers(NETDEV_DOWN, dev); | |
1307 | } | |
bd380811 | 1308 | |
44345724 OP |
1309 | /* rollback_registered_many needs the complete original list */ |
1310 | list_splice(&tmp_list, head); | |
bd380811 PM |
1311 | return 0; |
1312 | } | |
1313 | ||
1314 | /** | |
1315 | * dev_close - shutdown an interface. | |
1316 | * @dev: device to shutdown | |
1317 | * | |
1318 | * This function moves an active device into down state. A | |
1319 | * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device | |
1320 | * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier | |
1321 | * chain. | |
1322 | */ | |
1323 | int dev_close(struct net_device *dev) | |
1324 | { | |
44345724 | 1325 | LIST_HEAD(single); |
1da177e4 | 1326 | |
44345724 OP |
1327 | list_add(&dev->unreg_list, &single); |
1328 | dev_close_many(&single); | |
649274d9 | 1329 | |
1da177e4 LT |
1330 | return 0; |
1331 | } | |
d1b19dff | 1332 | EXPORT_SYMBOL(dev_close); |
1da177e4 LT |
1333 | |
1334 | ||
0187bdfb BH |
1335 | /** |
1336 | * dev_disable_lro - disable Large Receive Offload on a device | |
1337 | * @dev: device | |
1338 | * | |
1339 | * Disable Large Receive Offload (LRO) on a net device. Must be | |
1340 | * called under RTNL. This is needed if received packets may be | |
1341 | * forwarded to another interface. | |
1342 | */ | |
1343 | void dev_disable_lro(struct net_device *dev) | |
1344 | { | |
1345 | if (dev->ethtool_ops && dev->ethtool_ops->get_flags && | |
1346 | dev->ethtool_ops->set_flags) { | |
1347 | u32 flags = dev->ethtool_ops->get_flags(dev); | |
1348 | if (flags & ETH_FLAG_LRO) { | |
1349 | flags &= ~ETH_FLAG_LRO; | |
1350 | dev->ethtool_ops->set_flags(dev, flags); | |
1351 | } | |
1352 | } | |
1353 | WARN_ON(dev->features & NETIF_F_LRO); | |
1354 | } | |
1355 | EXPORT_SYMBOL(dev_disable_lro); | |
1356 | ||
1357 | ||
881d966b EB |
1358 | static int dev_boot_phase = 1; |
1359 | ||
1da177e4 LT |
1360 | /* |
1361 | * Device change register/unregister. These are not inline or static | |
1362 | * as we export them to the world. | |
1363 | */ | |
1364 | ||
1365 | /** | |
1366 | * register_netdevice_notifier - register a network notifier block | |
1367 | * @nb: notifier | |
1368 | * | |
1369 | * Register a notifier to be called when network device events occur. | |
1370 | * The notifier passed is linked into the kernel structures and must | |
1371 | * not be reused until it has been unregistered. A negative errno code | |
1372 | * is returned on a failure. | |
1373 | * | |
1374 | * When registered all registration and up events are replayed | |
4ec93edb | 1375 | * to the new notifier to allow device to have a race free |
1da177e4 LT |
1376 | * view of the network device list. |
1377 | */ | |
1378 | ||
1379 | int register_netdevice_notifier(struct notifier_block *nb) | |
1380 | { | |
1381 | struct net_device *dev; | |
fcc5a03a | 1382 | struct net_device *last; |
881d966b | 1383 | struct net *net; |
1da177e4 LT |
1384 | int err; |
1385 | ||
1386 | rtnl_lock(); | |
f07d5b94 | 1387 | err = raw_notifier_chain_register(&netdev_chain, nb); |
fcc5a03a HX |
1388 | if (err) |
1389 | goto unlock; | |
881d966b EB |
1390 | if (dev_boot_phase) |
1391 | goto unlock; | |
1392 | for_each_net(net) { | |
1393 | for_each_netdev(net, dev) { | |
1394 | err = nb->notifier_call(nb, NETDEV_REGISTER, dev); | |
1395 | err = notifier_to_errno(err); | |
1396 | if (err) | |
1397 | goto rollback; | |
1398 | ||
1399 | if (!(dev->flags & IFF_UP)) | |
1400 | continue; | |
1da177e4 | 1401 | |
881d966b EB |
1402 | nb->notifier_call(nb, NETDEV_UP, dev); |
1403 | } | |
1da177e4 | 1404 | } |
fcc5a03a HX |
1405 | |
1406 | unlock: | |
1da177e4 LT |
1407 | rtnl_unlock(); |
1408 | return err; | |
fcc5a03a HX |
1409 | |
1410 | rollback: | |
1411 | last = dev; | |
881d966b EB |
1412 | for_each_net(net) { |
1413 | for_each_netdev(net, dev) { | |
1414 | if (dev == last) | |
1415 | break; | |
fcc5a03a | 1416 | |
881d966b EB |
1417 | if (dev->flags & IFF_UP) { |
1418 | nb->notifier_call(nb, NETDEV_GOING_DOWN, dev); | |
1419 | nb->notifier_call(nb, NETDEV_DOWN, dev); | |
1420 | } | |
1421 | nb->notifier_call(nb, NETDEV_UNREGISTER, dev); | |
a5ee1551 | 1422 | nb->notifier_call(nb, NETDEV_UNREGISTER_BATCH, dev); |
fcc5a03a | 1423 | } |
fcc5a03a | 1424 | } |
c67625a1 PE |
1425 | |
1426 | raw_notifier_chain_unregister(&netdev_chain, nb); | |
fcc5a03a | 1427 | goto unlock; |
1da177e4 | 1428 | } |
d1b19dff | 1429 | EXPORT_SYMBOL(register_netdevice_notifier); |
1da177e4 LT |
1430 | |
1431 | /** | |
1432 | * unregister_netdevice_notifier - unregister a network notifier block | |
1433 | * @nb: notifier | |
1434 | * | |
1435 | * Unregister a notifier previously registered by | |
1436 | * register_netdevice_notifier(). The notifier is unlinked into the | |
1437 | * kernel structures and may then be reused. A negative errno code | |
1438 | * is returned on a failure. | |
1439 | */ | |
1440 | ||
1441 | int unregister_netdevice_notifier(struct notifier_block *nb) | |
1442 | { | |
9f514950 HX |
1443 | int err; |
1444 | ||
1445 | rtnl_lock(); | |
f07d5b94 | 1446 | err = raw_notifier_chain_unregister(&netdev_chain, nb); |
9f514950 HX |
1447 | rtnl_unlock(); |
1448 | return err; | |
1da177e4 | 1449 | } |
d1b19dff | 1450 | EXPORT_SYMBOL(unregister_netdevice_notifier); |
1da177e4 LT |
1451 | |
1452 | /** | |
1453 | * call_netdevice_notifiers - call all network notifier blocks | |
1454 | * @val: value passed unmodified to notifier function | |
c4ea43c5 | 1455 | * @dev: net_device pointer passed unmodified to notifier function |
1da177e4 LT |
1456 | * |
1457 | * Call all network notifier blocks. Parameters and return value | |
f07d5b94 | 1458 | * are as for raw_notifier_call_chain(). |
1da177e4 LT |
1459 | */ |
1460 | ||
ad7379d4 | 1461 | int call_netdevice_notifiers(unsigned long val, struct net_device *dev) |
1da177e4 | 1462 | { |
ab930471 | 1463 | ASSERT_RTNL(); |
ad7379d4 | 1464 | return raw_notifier_call_chain(&netdev_chain, val, dev); |
1da177e4 LT |
1465 | } |
1466 | ||
1467 | /* When > 0 there are consumers of rx skb time stamps */ | |
1468 | static atomic_t netstamp_needed = ATOMIC_INIT(0); | |
1469 | ||
1470 | void net_enable_timestamp(void) | |
1471 | { | |
1472 | atomic_inc(&netstamp_needed); | |
1473 | } | |
d1b19dff | 1474 | EXPORT_SYMBOL(net_enable_timestamp); |
1da177e4 LT |
1475 | |
1476 | void net_disable_timestamp(void) | |
1477 | { | |
1478 | atomic_dec(&netstamp_needed); | |
1479 | } | |
d1b19dff | 1480 | EXPORT_SYMBOL(net_disable_timestamp); |
1da177e4 | 1481 | |
3b098e2d | 1482 | static inline void net_timestamp_set(struct sk_buff *skb) |
1da177e4 LT |
1483 | { |
1484 | if (atomic_read(&netstamp_needed)) | |
a61bbcf2 | 1485 | __net_timestamp(skb); |
b7aa0bf7 ED |
1486 | else |
1487 | skb->tstamp.tv64 = 0; | |
1da177e4 LT |
1488 | } |
1489 | ||
3b098e2d ED |
1490 | static inline void net_timestamp_check(struct sk_buff *skb) |
1491 | { | |
1492 | if (!skb->tstamp.tv64 && atomic_read(&netstamp_needed)) | |
1493 | __net_timestamp(skb); | |
1494 | } | |
1495 | ||
44540960 AB |
1496 | /** |
1497 | * dev_forward_skb - loopback an skb to another netif | |
1498 | * | |
1499 | * @dev: destination network device | |
1500 | * @skb: buffer to forward | |
1501 | * | |
1502 | * return values: | |
1503 | * NET_RX_SUCCESS (no congestion) | |
6ec82562 | 1504 | * NET_RX_DROP (packet was dropped, but freed) |
44540960 AB |
1505 | * |
1506 | * dev_forward_skb can be used for injecting an skb from the | |
1507 | * start_xmit function of one device into the receive queue | |
1508 | * of another device. | |
1509 | * | |
1510 | * The receiving device may be in another namespace, so | |
1511 | * we have to clear all information in the skb that could | |
1512 | * impact namespace isolation. | |
1513 | */ | |
1514 | int dev_forward_skb(struct net_device *dev, struct sk_buff *skb) | |
1515 | { | |
1516 | skb_orphan(skb); | |
c736eefa | 1517 | nf_reset(skb); |
44540960 | 1518 | |
caf586e5 | 1519 | if (unlikely(!(dev->flags & IFF_UP) || |
2198a10b | 1520 | (skb->len > (dev->mtu + dev->hard_header_len + VLAN_HLEN)))) { |
caf586e5 | 1521 | atomic_long_inc(&dev->rx_dropped); |
6ec82562 | 1522 | kfree_skb(skb); |
44540960 | 1523 | return NET_RX_DROP; |
6ec82562 | 1524 | } |
8a83a00b | 1525 | skb_set_dev(skb, dev); |
44540960 AB |
1526 | skb->tstamp.tv64 = 0; |
1527 | skb->pkt_type = PACKET_HOST; | |
1528 | skb->protocol = eth_type_trans(skb, dev); | |
44540960 AB |
1529 | return netif_rx(skb); |
1530 | } | |
1531 | EXPORT_SYMBOL_GPL(dev_forward_skb); | |
1532 | ||
71d9dec2 CG |
1533 | static inline int deliver_skb(struct sk_buff *skb, |
1534 | struct packet_type *pt_prev, | |
1535 | struct net_device *orig_dev) | |
1536 | { | |
1537 | atomic_inc(&skb->users); | |
1538 | return pt_prev->func(skb, skb->dev, pt_prev, orig_dev); | |
1539 | } | |
1540 | ||
1da177e4 LT |
1541 | /* |
1542 | * Support routine. Sends outgoing frames to any network | |
1543 | * taps currently in use. | |
1544 | */ | |
1545 | ||
f6a78bfc | 1546 | static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
1547 | { |
1548 | struct packet_type *ptype; | |
71d9dec2 CG |
1549 | struct sk_buff *skb2 = NULL; |
1550 | struct packet_type *pt_prev = NULL; | |
a61bbcf2 | 1551 | |
1da177e4 LT |
1552 | rcu_read_lock(); |
1553 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
1554 | /* Never send packets back to the socket | |
1555 | * they originated from - MvS (miquels@drinkel.ow.org) | |
1556 | */ | |
1557 | if ((ptype->dev == dev || !ptype->dev) && | |
1558 | (ptype->af_packet_priv == NULL || | |
1559 | (struct sock *)ptype->af_packet_priv != skb->sk)) { | |
71d9dec2 CG |
1560 | if (pt_prev) { |
1561 | deliver_skb(skb2, pt_prev, skb->dev); | |
1562 | pt_prev = ptype; | |
1563 | continue; | |
1564 | } | |
1565 | ||
1566 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
1da177e4 LT |
1567 | if (!skb2) |
1568 | break; | |
1569 | ||
70978182 ED |
1570 | net_timestamp_set(skb2); |
1571 | ||
1da177e4 LT |
1572 | /* skb->nh should be correctly |
1573 | set by sender, so that the second statement is | |
1574 | just protection against buggy protocols. | |
1575 | */ | |
459a98ed | 1576 | skb_reset_mac_header(skb2); |
1da177e4 | 1577 | |
d56f90a7 | 1578 | if (skb_network_header(skb2) < skb2->data || |
27a884dc | 1579 | skb2->network_header > skb2->tail) { |
1da177e4 LT |
1580 | if (net_ratelimit()) |
1581 | printk(KERN_CRIT "protocol %04x is " | |
1582 | "buggy, dev %s\n", | |
70777d03 SAS |
1583 | ntohs(skb2->protocol), |
1584 | dev->name); | |
c1d2bbe1 | 1585 | skb_reset_network_header(skb2); |
1da177e4 LT |
1586 | } |
1587 | ||
b0e380b1 | 1588 | skb2->transport_header = skb2->network_header; |
1da177e4 | 1589 | skb2->pkt_type = PACKET_OUTGOING; |
71d9dec2 | 1590 | pt_prev = ptype; |
1da177e4 LT |
1591 | } |
1592 | } | |
71d9dec2 CG |
1593 | if (pt_prev) |
1594 | pt_prev->func(skb2, skb->dev, pt_prev, skb->dev); | |
1da177e4 LT |
1595 | rcu_read_unlock(); |
1596 | } | |
1597 | ||
4f57c087 JF |
1598 | /* netif_setup_tc - Handle tc mappings on real_num_tx_queues change |
1599 | * @dev: Network device | |
1600 | * @txq: number of queues available | |
1601 | * | |
1602 | * If real_num_tx_queues is changed the tc mappings may no longer be | |
1603 | * valid. To resolve this verify the tc mapping remains valid and if | |
1604 | * not NULL the mapping. With no priorities mapping to this | |
1605 | * offset/count pair it will no longer be used. In the worst case TC0 | |
1606 | * is invalid nothing can be done so disable priority mappings. If is | |
1607 | * expected that drivers will fix this mapping if they can before | |
1608 | * calling netif_set_real_num_tx_queues. | |
1609 | */ | |
bb134d22 | 1610 | static void netif_setup_tc(struct net_device *dev, unsigned int txq) |
4f57c087 JF |
1611 | { |
1612 | int i; | |
1613 | struct netdev_tc_txq *tc = &dev->tc_to_txq[0]; | |
1614 | ||
1615 | /* If TC0 is invalidated disable TC mapping */ | |
1616 | if (tc->offset + tc->count > txq) { | |
1617 | pr_warning("Number of in use tx queues changed " | |
1618 | "invalidating tc mappings. Priority " | |
1619 | "traffic classification disabled!\n"); | |
1620 | dev->num_tc = 0; | |
1621 | return; | |
1622 | } | |
1623 | ||
1624 | /* Invalidated prio to tc mappings set to TC0 */ | |
1625 | for (i = 1; i < TC_BITMASK + 1; i++) { | |
1626 | int q = netdev_get_prio_tc_map(dev, i); | |
1627 | ||
1628 | tc = &dev->tc_to_txq[q]; | |
1629 | if (tc->offset + tc->count > txq) { | |
1630 | pr_warning("Number of in use tx queues " | |
1631 | "changed. Priority %i to tc " | |
1632 | "mapping %i is no longer valid " | |
1633 | "setting map to 0\n", | |
1634 | i, q); | |
1635 | netdev_set_prio_tc_map(dev, i, 0); | |
1636 | } | |
1637 | } | |
1638 | } | |
1639 | ||
f0796d5c JF |
1640 | /* |
1641 | * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues | |
1642 | * greater then real_num_tx_queues stale skbs on the qdisc must be flushed. | |
1643 | */ | |
e6484930 | 1644 | int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq) |
f0796d5c | 1645 | { |
1d24eb48 TH |
1646 | int rc; |
1647 | ||
e6484930 TH |
1648 | if (txq < 1 || txq > dev->num_tx_queues) |
1649 | return -EINVAL; | |
f0796d5c | 1650 | |
e6484930 TH |
1651 | if (dev->reg_state == NETREG_REGISTERED) { |
1652 | ASSERT_RTNL(); | |
1653 | ||
1d24eb48 TH |
1654 | rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues, |
1655 | txq); | |
bf264145 TH |
1656 | if (rc) |
1657 | return rc; | |
1658 | ||
4f57c087 JF |
1659 | if (dev->num_tc) |
1660 | netif_setup_tc(dev, txq); | |
1661 | ||
e6484930 TH |
1662 | if (txq < dev->real_num_tx_queues) |
1663 | qdisc_reset_all_tx_gt(dev, txq); | |
f0796d5c | 1664 | } |
e6484930 TH |
1665 | |
1666 | dev->real_num_tx_queues = txq; | |
1667 | return 0; | |
f0796d5c JF |
1668 | } |
1669 | EXPORT_SYMBOL(netif_set_real_num_tx_queues); | |
56079431 | 1670 | |
62fe0b40 BH |
1671 | #ifdef CONFIG_RPS |
1672 | /** | |
1673 | * netif_set_real_num_rx_queues - set actual number of RX queues used | |
1674 | * @dev: Network device | |
1675 | * @rxq: Actual number of RX queues | |
1676 | * | |
1677 | * This must be called either with the rtnl_lock held or before | |
1678 | * registration of the net device. Returns 0 on success, or a | |
4e7f7951 BH |
1679 | * negative error code. If called before registration, it always |
1680 | * succeeds. | |
62fe0b40 BH |
1681 | */ |
1682 | int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq) | |
1683 | { | |
1684 | int rc; | |
1685 | ||
bd25fa7b TH |
1686 | if (rxq < 1 || rxq > dev->num_rx_queues) |
1687 | return -EINVAL; | |
1688 | ||
62fe0b40 BH |
1689 | if (dev->reg_state == NETREG_REGISTERED) { |
1690 | ASSERT_RTNL(); | |
1691 | ||
62fe0b40 BH |
1692 | rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues, |
1693 | rxq); | |
1694 | if (rc) | |
1695 | return rc; | |
62fe0b40 BH |
1696 | } |
1697 | ||
1698 | dev->real_num_rx_queues = rxq; | |
1699 | return 0; | |
1700 | } | |
1701 | EXPORT_SYMBOL(netif_set_real_num_rx_queues); | |
1702 | #endif | |
1703 | ||
def82a1d | 1704 | static inline void __netif_reschedule(struct Qdisc *q) |
56079431 | 1705 | { |
def82a1d JP |
1706 | struct softnet_data *sd; |
1707 | unsigned long flags; | |
56079431 | 1708 | |
def82a1d JP |
1709 | local_irq_save(flags); |
1710 | sd = &__get_cpu_var(softnet_data); | |
a9cbd588 CG |
1711 | q->next_sched = NULL; |
1712 | *sd->output_queue_tailp = q; | |
1713 | sd->output_queue_tailp = &q->next_sched; | |
def82a1d JP |
1714 | raise_softirq_irqoff(NET_TX_SOFTIRQ); |
1715 | local_irq_restore(flags); | |
1716 | } | |
1717 | ||
1718 | void __netif_schedule(struct Qdisc *q) | |
1719 | { | |
1720 | if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state)) | |
1721 | __netif_reschedule(q); | |
56079431 DV |
1722 | } |
1723 | EXPORT_SYMBOL(__netif_schedule); | |
1724 | ||
bea3348e | 1725 | void dev_kfree_skb_irq(struct sk_buff *skb) |
56079431 | 1726 | { |
3578b0c8 | 1727 | if (atomic_dec_and_test(&skb->users)) { |
bea3348e SH |
1728 | struct softnet_data *sd; |
1729 | unsigned long flags; | |
56079431 | 1730 | |
bea3348e SH |
1731 | local_irq_save(flags); |
1732 | sd = &__get_cpu_var(softnet_data); | |
1733 | skb->next = sd->completion_queue; | |
1734 | sd->completion_queue = skb; | |
1735 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
1736 | local_irq_restore(flags); | |
1737 | } | |
56079431 | 1738 | } |
bea3348e | 1739 | EXPORT_SYMBOL(dev_kfree_skb_irq); |
56079431 DV |
1740 | |
1741 | void dev_kfree_skb_any(struct sk_buff *skb) | |
1742 | { | |
1743 | if (in_irq() || irqs_disabled()) | |
1744 | dev_kfree_skb_irq(skb); | |
1745 | else | |
1746 | dev_kfree_skb(skb); | |
1747 | } | |
1748 | EXPORT_SYMBOL(dev_kfree_skb_any); | |
1749 | ||
1750 | ||
bea3348e SH |
1751 | /** |
1752 | * netif_device_detach - mark device as removed | |
1753 | * @dev: network device | |
1754 | * | |
1755 | * Mark device as removed from system and therefore no longer available. | |
1756 | */ | |
56079431 DV |
1757 | void netif_device_detach(struct net_device *dev) |
1758 | { | |
1759 | if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) && | |
1760 | netif_running(dev)) { | |
d543103a | 1761 | netif_tx_stop_all_queues(dev); |
56079431 DV |
1762 | } |
1763 | } | |
1764 | EXPORT_SYMBOL(netif_device_detach); | |
1765 | ||
bea3348e SH |
1766 | /** |
1767 | * netif_device_attach - mark device as attached | |
1768 | * @dev: network device | |
1769 | * | |
1770 | * Mark device as attached from system and restart if needed. | |
1771 | */ | |
56079431 DV |
1772 | void netif_device_attach(struct net_device *dev) |
1773 | { | |
1774 | if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) && | |
1775 | netif_running(dev)) { | |
d543103a | 1776 | netif_tx_wake_all_queues(dev); |
4ec93edb | 1777 | __netdev_watchdog_up(dev); |
56079431 DV |
1778 | } |
1779 | } | |
1780 | EXPORT_SYMBOL(netif_device_attach); | |
1781 | ||
8a83a00b AB |
1782 | /** |
1783 | * skb_dev_set -- assign a new device to a buffer | |
1784 | * @skb: buffer for the new device | |
1785 | * @dev: network device | |
1786 | * | |
1787 | * If an skb is owned by a device already, we have to reset | |
1788 | * all data private to the namespace a device belongs to | |
1789 | * before assigning it a new device. | |
1790 | */ | |
1791 | #ifdef CONFIG_NET_NS | |
1792 | void skb_set_dev(struct sk_buff *skb, struct net_device *dev) | |
1793 | { | |
1794 | skb_dst_drop(skb); | |
1795 | if (skb->dev && !net_eq(dev_net(skb->dev), dev_net(dev))) { | |
1796 | secpath_reset(skb); | |
1797 | nf_reset(skb); | |
1798 | skb_init_secmark(skb); | |
1799 | skb->mark = 0; | |
1800 | skb->priority = 0; | |
1801 | skb->nf_trace = 0; | |
1802 | skb->ipvs_property = 0; | |
1803 | #ifdef CONFIG_NET_SCHED | |
1804 | skb->tc_index = 0; | |
1805 | #endif | |
1806 | } | |
1807 | skb->dev = dev; | |
1808 | } | |
1809 | EXPORT_SYMBOL(skb_set_dev); | |
1810 | #endif /* CONFIG_NET_NS */ | |
1811 | ||
1da177e4 LT |
1812 | /* |
1813 | * Invalidate hardware checksum when packet is to be mangled, and | |
1814 | * complete checksum manually on outgoing path. | |
1815 | */ | |
84fa7933 | 1816 | int skb_checksum_help(struct sk_buff *skb) |
1da177e4 | 1817 | { |
d3bc23e7 | 1818 | __wsum csum; |
663ead3b | 1819 | int ret = 0, offset; |
1da177e4 | 1820 | |
84fa7933 | 1821 | if (skb->ip_summed == CHECKSUM_COMPLETE) |
a430a43d HX |
1822 | goto out_set_summed; |
1823 | ||
1824 | if (unlikely(skb_shinfo(skb)->gso_size)) { | |
a430a43d HX |
1825 | /* Let GSO fix up the checksum. */ |
1826 | goto out_set_summed; | |
1da177e4 LT |
1827 | } |
1828 | ||
55508d60 | 1829 | offset = skb_checksum_start_offset(skb); |
a030847e HX |
1830 | BUG_ON(offset >= skb_headlen(skb)); |
1831 | csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
1832 | ||
1833 | offset += skb->csum_offset; | |
1834 | BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb)); | |
1835 | ||
1836 | if (skb_cloned(skb) && | |
1837 | !skb_clone_writable(skb, offset + sizeof(__sum16))) { | |
1da177e4 LT |
1838 | ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC); |
1839 | if (ret) | |
1840 | goto out; | |
1841 | } | |
1842 | ||
a030847e | 1843 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
a430a43d | 1844 | out_set_summed: |
1da177e4 | 1845 | skb->ip_summed = CHECKSUM_NONE; |
4ec93edb | 1846 | out: |
1da177e4 LT |
1847 | return ret; |
1848 | } | |
d1b19dff | 1849 | EXPORT_SYMBOL(skb_checksum_help); |
1da177e4 | 1850 | |
f6a78bfc HX |
1851 | /** |
1852 | * skb_gso_segment - Perform segmentation on skb. | |
1853 | * @skb: buffer to segment | |
576a30eb | 1854 | * @features: features for the output path (see dev->features) |
f6a78bfc HX |
1855 | * |
1856 | * This function segments the given skb and returns a list of segments. | |
576a30eb HX |
1857 | * |
1858 | * It may return NULL if the skb requires no segmentation. This is | |
1859 | * only possible when GSO is used for verifying header integrity. | |
f6a78bfc | 1860 | */ |
04ed3e74 | 1861 | struct sk_buff *skb_gso_segment(struct sk_buff *skb, u32 features) |
f6a78bfc HX |
1862 | { |
1863 | struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT); | |
1864 | struct packet_type *ptype; | |
252e3346 | 1865 | __be16 type = skb->protocol; |
c8d5bcd1 | 1866 | int vlan_depth = ETH_HLEN; |
a430a43d | 1867 | int err; |
f6a78bfc | 1868 | |
c8d5bcd1 JG |
1869 | while (type == htons(ETH_P_8021Q)) { |
1870 | struct vlan_hdr *vh; | |
7b9c6090 | 1871 | |
c8d5bcd1 | 1872 | if (unlikely(!pskb_may_pull(skb, vlan_depth + VLAN_HLEN))) |
7b9c6090 JG |
1873 | return ERR_PTR(-EINVAL); |
1874 | ||
c8d5bcd1 JG |
1875 | vh = (struct vlan_hdr *)(skb->data + vlan_depth); |
1876 | type = vh->h_vlan_encapsulated_proto; | |
1877 | vlan_depth += VLAN_HLEN; | |
7b9c6090 JG |
1878 | } |
1879 | ||
459a98ed | 1880 | skb_reset_mac_header(skb); |
b0e380b1 | 1881 | skb->mac_len = skb->network_header - skb->mac_header; |
f6a78bfc HX |
1882 | __skb_pull(skb, skb->mac_len); |
1883 | ||
67fd1a73 HX |
1884 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
1885 | struct net_device *dev = skb->dev; | |
1886 | struct ethtool_drvinfo info = {}; | |
1887 | ||
1888 | if (dev && dev->ethtool_ops && dev->ethtool_ops->get_drvinfo) | |
1889 | dev->ethtool_ops->get_drvinfo(dev, &info); | |
1890 | ||
b194a367 | 1891 | WARN(1, "%s: caps=(0x%lx, 0x%lx) len=%d data_len=%d ip_summed=%d\n", |
67fd1a73 HX |
1892 | info.driver, dev ? dev->features : 0L, |
1893 | skb->sk ? skb->sk->sk_route_caps : 0L, | |
1894 | skb->len, skb->data_len, skb->ip_summed); | |
1895 | ||
a430a43d HX |
1896 | if (skb_header_cloned(skb) && |
1897 | (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC))) | |
1898 | return ERR_PTR(err); | |
1899 | } | |
1900 | ||
f6a78bfc | 1901 | rcu_read_lock(); |
82d8a867 PE |
1902 | list_for_each_entry_rcu(ptype, |
1903 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { | |
f6a78bfc | 1904 | if (ptype->type == type && !ptype->dev && ptype->gso_segment) { |
84fa7933 | 1905 | if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { |
a430a43d HX |
1906 | err = ptype->gso_send_check(skb); |
1907 | segs = ERR_PTR(err); | |
1908 | if (err || skb_gso_ok(skb, features)) | |
1909 | break; | |
d56f90a7 ACM |
1910 | __skb_push(skb, (skb->data - |
1911 | skb_network_header(skb))); | |
a430a43d | 1912 | } |
576a30eb | 1913 | segs = ptype->gso_segment(skb, features); |
f6a78bfc HX |
1914 | break; |
1915 | } | |
1916 | } | |
1917 | rcu_read_unlock(); | |
1918 | ||
98e399f8 | 1919 | __skb_push(skb, skb->data - skb_mac_header(skb)); |
576a30eb | 1920 | |
f6a78bfc HX |
1921 | return segs; |
1922 | } | |
f6a78bfc HX |
1923 | EXPORT_SYMBOL(skb_gso_segment); |
1924 | ||
fb286bb2 HX |
1925 | /* Take action when hardware reception checksum errors are detected. */ |
1926 | #ifdef CONFIG_BUG | |
1927 | void netdev_rx_csum_fault(struct net_device *dev) | |
1928 | { | |
1929 | if (net_ratelimit()) { | |
4ec93edb | 1930 | printk(KERN_ERR "%s: hw csum failure.\n", |
246a4212 | 1931 | dev ? dev->name : "<unknown>"); |
fb286bb2 HX |
1932 | dump_stack(); |
1933 | } | |
1934 | } | |
1935 | EXPORT_SYMBOL(netdev_rx_csum_fault); | |
1936 | #endif | |
1937 | ||
1da177e4 LT |
1938 | /* Actually, we should eliminate this check as soon as we know, that: |
1939 | * 1. IOMMU is present and allows to map all the memory. | |
1940 | * 2. No high memory really exists on this machine. | |
1941 | */ | |
1942 | ||
9092c658 | 1943 | static int illegal_highdma(struct net_device *dev, struct sk_buff *skb) |
1da177e4 | 1944 | { |
3d3a8533 | 1945 | #ifdef CONFIG_HIGHMEM |
1da177e4 | 1946 | int i; |
5acbbd42 FT |
1947 | if (!(dev->features & NETIF_F_HIGHDMA)) { |
1948 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) | |
1949 | if (PageHighMem(skb_shinfo(skb)->frags[i].page)) | |
1950 | return 1; | |
1951 | } | |
1da177e4 | 1952 | |
5acbbd42 FT |
1953 | if (PCI_DMA_BUS_IS_PHYS) { |
1954 | struct device *pdev = dev->dev.parent; | |
1da177e4 | 1955 | |
9092c658 ED |
1956 | if (!pdev) |
1957 | return 0; | |
5acbbd42 FT |
1958 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { |
1959 | dma_addr_t addr = page_to_phys(skb_shinfo(skb)->frags[i].page); | |
1960 | if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask) | |
1961 | return 1; | |
1962 | } | |
1963 | } | |
3d3a8533 | 1964 | #endif |
1da177e4 LT |
1965 | return 0; |
1966 | } | |
1da177e4 | 1967 | |
f6a78bfc HX |
1968 | struct dev_gso_cb { |
1969 | void (*destructor)(struct sk_buff *skb); | |
1970 | }; | |
1971 | ||
1972 | #define DEV_GSO_CB(skb) ((struct dev_gso_cb *)(skb)->cb) | |
1973 | ||
1974 | static void dev_gso_skb_destructor(struct sk_buff *skb) | |
1975 | { | |
1976 | struct dev_gso_cb *cb; | |
1977 | ||
1978 | do { | |
1979 | struct sk_buff *nskb = skb->next; | |
1980 | ||
1981 | skb->next = nskb->next; | |
1982 | nskb->next = NULL; | |
1983 | kfree_skb(nskb); | |
1984 | } while (skb->next); | |
1985 | ||
1986 | cb = DEV_GSO_CB(skb); | |
1987 | if (cb->destructor) | |
1988 | cb->destructor(skb); | |
1989 | } | |
1990 | ||
1991 | /** | |
1992 | * dev_gso_segment - Perform emulated hardware segmentation on skb. | |
1993 | * @skb: buffer to segment | |
91ecb63c | 1994 | * @features: device features as applicable to this skb |
f6a78bfc HX |
1995 | * |
1996 | * This function segments the given skb and stores the list of segments | |
1997 | * in skb->next. | |
1998 | */ | |
91ecb63c | 1999 | static int dev_gso_segment(struct sk_buff *skb, int features) |
f6a78bfc | 2000 | { |
f6a78bfc | 2001 | struct sk_buff *segs; |
576a30eb HX |
2002 | |
2003 | segs = skb_gso_segment(skb, features); | |
2004 | ||
2005 | /* Verifying header integrity only. */ | |
2006 | if (!segs) | |
2007 | return 0; | |
f6a78bfc | 2008 | |
801678c5 | 2009 | if (IS_ERR(segs)) |
f6a78bfc HX |
2010 | return PTR_ERR(segs); |
2011 | ||
2012 | skb->next = segs; | |
2013 | DEV_GSO_CB(skb)->destructor = skb->destructor; | |
2014 | skb->destructor = dev_gso_skb_destructor; | |
2015 | ||
2016 | return 0; | |
2017 | } | |
2018 | ||
fc6055a5 ED |
2019 | /* |
2020 | * Try to orphan skb early, right before transmission by the device. | |
2244d07b OH |
2021 | * We cannot orphan skb if tx timestamp is requested or the sk-reference |
2022 | * is needed on driver level for other reasons, e.g. see net/can/raw.c | |
fc6055a5 ED |
2023 | */ |
2024 | static inline void skb_orphan_try(struct sk_buff *skb) | |
2025 | { | |
87fd308c ED |
2026 | struct sock *sk = skb->sk; |
2027 | ||
2244d07b | 2028 | if (sk && !skb_shinfo(skb)->tx_flags) { |
87fd308c ED |
2029 | /* skb_tx_hash() wont be able to get sk. |
2030 | * We copy sk_hash into skb->rxhash | |
2031 | */ | |
2032 | if (!skb->rxhash) | |
2033 | skb->rxhash = sk->sk_hash; | |
fc6055a5 | 2034 | skb_orphan(skb); |
87fd308c | 2035 | } |
fc6055a5 ED |
2036 | } |
2037 | ||
03634668 JG |
2038 | static bool can_checksum_protocol(unsigned long features, __be16 protocol) |
2039 | { | |
2040 | return ((features & NETIF_F_GEN_CSUM) || | |
2041 | ((features & NETIF_F_V4_CSUM) && | |
2042 | protocol == htons(ETH_P_IP)) || | |
2043 | ((features & NETIF_F_V6_CSUM) && | |
2044 | protocol == htons(ETH_P_IPV6)) || | |
2045 | ((features & NETIF_F_FCOE_CRC) && | |
2046 | protocol == htons(ETH_P_FCOE))); | |
2047 | } | |
2048 | ||
04ed3e74 | 2049 | static u32 harmonize_features(struct sk_buff *skb, __be16 protocol, u32 features) |
f01a5236 | 2050 | { |
d402786e | 2051 | if (!can_checksum_protocol(features, protocol)) { |
f01a5236 JG |
2052 | features &= ~NETIF_F_ALL_CSUM; |
2053 | features &= ~NETIF_F_SG; | |
2054 | } else if (illegal_highdma(skb->dev, skb)) { | |
2055 | features &= ~NETIF_F_SG; | |
2056 | } | |
2057 | ||
2058 | return features; | |
2059 | } | |
2060 | ||
04ed3e74 | 2061 | u32 netif_skb_features(struct sk_buff *skb) |
58e998c6 JG |
2062 | { |
2063 | __be16 protocol = skb->protocol; | |
04ed3e74 | 2064 | u32 features = skb->dev->features; |
58e998c6 JG |
2065 | |
2066 | if (protocol == htons(ETH_P_8021Q)) { | |
2067 | struct vlan_ethhdr *veh = (struct vlan_ethhdr *)skb->data; | |
2068 | protocol = veh->h_vlan_encapsulated_proto; | |
f01a5236 JG |
2069 | } else if (!vlan_tx_tag_present(skb)) { |
2070 | return harmonize_features(skb, protocol, features); | |
2071 | } | |
58e998c6 | 2072 | |
6ee400aa | 2073 | features &= (skb->dev->vlan_features | NETIF_F_HW_VLAN_TX); |
f01a5236 JG |
2074 | |
2075 | if (protocol != htons(ETH_P_8021Q)) { | |
2076 | return harmonize_features(skb, protocol, features); | |
2077 | } else { | |
2078 | features &= NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | | |
6ee400aa | 2079 | NETIF_F_GEN_CSUM | NETIF_F_HW_VLAN_TX; |
f01a5236 JG |
2080 | return harmonize_features(skb, protocol, features); |
2081 | } | |
58e998c6 | 2082 | } |
f01a5236 | 2083 | EXPORT_SYMBOL(netif_skb_features); |
58e998c6 | 2084 | |
6afff0ca JF |
2085 | /* |
2086 | * Returns true if either: | |
2087 | * 1. skb has frag_list and the device doesn't support FRAGLIST, or | |
2088 | * 2. skb is fragmented and the device does not support SG, or if | |
2089 | * at least one of fragments is in highmem and device does not | |
2090 | * support DMA from it. | |
2091 | */ | |
2092 | static inline int skb_needs_linearize(struct sk_buff *skb, | |
02932ce9 | 2093 | int features) |
6afff0ca | 2094 | { |
02932ce9 JG |
2095 | return skb_is_nonlinear(skb) && |
2096 | ((skb_has_frag_list(skb) && | |
2097 | !(features & NETIF_F_FRAGLIST)) || | |
e1e78db6 | 2098 | (skb_shinfo(skb)->nr_frags && |
02932ce9 | 2099 | !(features & NETIF_F_SG))); |
6afff0ca JF |
2100 | } |
2101 | ||
fd2ea0a7 DM |
2102 | int dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev, |
2103 | struct netdev_queue *txq) | |
f6a78bfc | 2104 | { |
00829823 | 2105 | const struct net_device_ops *ops = dev->netdev_ops; |
572a9d7b | 2106 | int rc = NETDEV_TX_OK; |
00829823 | 2107 | |
f6a78bfc | 2108 | if (likely(!skb->next)) { |
04ed3e74 | 2109 | u32 features; |
fc741216 | 2110 | |
93f154b5 ED |
2111 | /* |
2112 | * If device doesnt need skb->dst, release it right now while | |
2113 | * its hot in this cpu cache | |
2114 | */ | |
adf30907 ED |
2115 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) |
2116 | skb_dst_drop(skb); | |
2117 | ||
15c2d75f ED |
2118 | if (!list_empty(&ptype_all)) |
2119 | dev_queue_xmit_nit(skb, dev); | |
2120 | ||
fc6055a5 | 2121 | skb_orphan_try(skb); |
9ccb8975 | 2122 | |
fc741216 JG |
2123 | features = netif_skb_features(skb); |
2124 | ||
7b9c6090 | 2125 | if (vlan_tx_tag_present(skb) && |
fc741216 | 2126 | !(features & NETIF_F_HW_VLAN_TX)) { |
7b9c6090 JG |
2127 | skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb)); |
2128 | if (unlikely(!skb)) | |
2129 | goto out; | |
2130 | ||
2131 | skb->vlan_tci = 0; | |
2132 | } | |
2133 | ||
fc741216 | 2134 | if (netif_needs_gso(skb, features)) { |
91ecb63c | 2135 | if (unlikely(dev_gso_segment(skb, features))) |
9ccb8975 DM |
2136 | goto out_kfree_skb; |
2137 | if (skb->next) | |
2138 | goto gso; | |
6afff0ca | 2139 | } else { |
02932ce9 | 2140 | if (skb_needs_linearize(skb, features) && |
6afff0ca JF |
2141 | __skb_linearize(skb)) |
2142 | goto out_kfree_skb; | |
2143 | ||
2144 | /* If packet is not checksummed and device does not | |
2145 | * support checksumming for this protocol, complete | |
2146 | * checksumming here. | |
2147 | */ | |
2148 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
55508d60 MM |
2149 | skb_set_transport_header(skb, |
2150 | skb_checksum_start_offset(skb)); | |
03634668 | 2151 | if (!(features & NETIF_F_ALL_CSUM) && |
6afff0ca JF |
2152 | skb_checksum_help(skb)) |
2153 | goto out_kfree_skb; | |
2154 | } | |
9ccb8975 DM |
2155 | } |
2156 | ||
ac45f602 | 2157 | rc = ops->ndo_start_xmit(skb, dev); |
cf66ba58 | 2158 | trace_net_dev_xmit(skb, rc); |
ec634fe3 | 2159 | if (rc == NETDEV_TX_OK) |
08baf561 | 2160 | txq_trans_update(txq); |
ac45f602 | 2161 | return rc; |
f6a78bfc HX |
2162 | } |
2163 | ||
576a30eb | 2164 | gso: |
f6a78bfc HX |
2165 | do { |
2166 | struct sk_buff *nskb = skb->next; | |
f6a78bfc HX |
2167 | |
2168 | skb->next = nskb->next; | |
2169 | nskb->next = NULL; | |
068a2de5 KK |
2170 | |
2171 | /* | |
2172 | * If device doesnt need nskb->dst, release it right now while | |
2173 | * its hot in this cpu cache | |
2174 | */ | |
2175 | if (dev->priv_flags & IFF_XMIT_DST_RELEASE) | |
2176 | skb_dst_drop(nskb); | |
2177 | ||
00829823 | 2178 | rc = ops->ndo_start_xmit(nskb, dev); |
cf66ba58 | 2179 | trace_net_dev_xmit(nskb, rc); |
ec634fe3 | 2180 | if (unlikely(rc != NETDEV_TX_OK)) { |
572a9d7b PM |
2181 | if (rc & ~NETDEV_TX_MASK) |
2182 | goto out_kfree_gso_skb; | |
f54d9e8d | 2183 | nskb->next = skb->next; |
f6a78bfc HX |
2184 | skb->next = nskb; |
2185 | return rc; | |
2186 | } | |
08baf561 | 2187 | txq_trans_update(txq); |
fd2ea0a7 | 2188 | if (unlikely(netif_tx_queue_stopped(txq) && skb->next)) |
f54d9e8d | 2189 | return NETDEV_TX_BUSY; |
f6a78bfc | 2190 | } while (skb->next); |
4ec93edb | 2191 | |
572a9d7b PM |
2192 | out_kfree_gso_skb: |
2193 | if (likely(skb->next == NULL)) | |
2194 | skb->destructor = DEV_GSO_CB(skb)->destructor; | |
f6a78bfc HX |
2195 | out_kfree_skb: |
2196 | kfree_skb(skb); | |
7b9c6090 | 2197 | out: |
572a9d7b | 2198 | return rc; |
f6a78bfc HX |
2199 | } |
2200 | ||
0a9627f2 | 2201 | static u32 hashrnd __read_mostly; |
b6b2fed1 | 2202 | |
a3d22a68 VZ |
2203 | /* |
2204 | * Returns a Tx hash based on the given packet descriptor a Tx queues' number | |
2205 | * to be used as a distribution range. | |
2206 | */ | |
2207 | u16 __skb_tx_hash(const struct net_device *dev, const struct sk_buff *skb, | |
2208 | unsigned int num_tx_queues) | |
8f0f2223 | 2209 | { |
7019298a | 2210 | u32 hash; |
4f57c087 JF |
2211 | u16 qoffset = 0; |
2212 | u16 qcount = num_tx_queues; | |
b6b2fed1 | 2213 | |
513de11b DM |
2214 | if (skb_rx_queue_recorded(skb)) { |
2215 | hash = skb_get_rx_queue(skb); | |
a3d22a68 VZ |
2216 | while (unlikely(hash >= num_tx_queues)) |
2217 | hash -= num_tx_queues; | |
513de11b DM |
2218 | return hash; |
2219 | } | |
ec581f6a | 2220 | |
4f57c087 JF |
2221 | if (dev->num_tc) { |
2222 | u8 tc = netdev_get_prio_tc_map(dev, skb->priority); | |
2223 | qoffset = dev->tc_to_txq[tc].offset; | |
2224 | qcount = dev->tc_to_txq[tc].count; | |
2225 | } | |
2226 | ||
ec581f6a | 2227 | if (skb->sk && skb->sk->sk_hash) |
7019298a | 2228 | hash = skb->sk->sk_hash; |
ec581f6a | 2229 | else |
87fd308c | 2230 | hash = (__force u16) skb->protocol ^ skb->rxhash; |
0a9627f2 | 2231 | hash = jhash_1word(hash, hashrnd); |
b6b2fed1 | 2232 | |
4f57c087 | 2233 | return (u16) (((u64) hash * qcount) >> 32) + qoffset; |
8f0f2223 | 2234 | } |
a3d22a68 | 2235 | EXPORT_SYMBOL(__skb_tx_hash); |
8f0f2223 | 2236 | |
ed04642f ED |
2237 | static inline u16 dev_cap_txqueue(struct net_device *dev, u16 queue_index) |
2238 | { | |
2239 | if (unlikely(queue_index >= dev->real_num_tx_queues)) { | |
2240 | if (net_ratelimit()) { | |
7a161ea9 ED |
2241 | pr_warning("%s selects TX queue %d, but " |
2242 | "real number of TX queues is %d\n", | |
2243 | dev->name, queue_index, dev->real_num_tx_queues); | |
ed04642f ED |
2244 | } |
2245 | return 0; | |
2246 | } | |
2247 | return queue_index; | |
2248 | } | |
2249 | ||
1d24eb48 TH |
2250 | static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb) |
2251 | { | |
bf264145 | 2252 | #ifdef CONFIG_XPS |
1d24eb48 TH |
2253 | struct xps_dev_maps *dev_maps; |
2254 | struct xps_map *map; | |
2255 | int queue_index = -1; | |
2256 | ||
2257 | rcu_read_lock(); | |
2258 | dev_maps = rcu_dereference(dev->xps_maps); | |
2259 | if (dev_maps) { | |
2260 | map = rcu_dereference( | |
2261 | dev_maps->cpu_map[raw_smp_processor_id()]); | |
2262 | if (map) { | |
2263 | if (map->len == 1) | |
2264 | queue_index = map->queues[0]; | |
2265 | else { | |
2266 | u32 hash; | |
2267 | if (skb->sk && skb->sk->sk_hash) | |
2268 | hash = skb->sk->sk_hash; | |
2269 | else | |
2270 | hash = (__force u16) skb->protocol ^ | |
2271 | skb->rxhash; | |
2272 | hash = jhash_1word(hash, hashrnd); | |
2273 | queue_index = map->queues[ | |
2274 | ((u64)hash * map->len) >> 32]; | |
2275 | } | |
2276 | if (unlikely(queue_index >= dev->real_num_tx_queues)) | |
2277 | queue_index = -1; | |
2278 | } | |
2279 | } | |
2280 | rcu_read_unlock(); | |
2281 | ||
2282 | return queue_index; | |
2283 | #else | |
2284 | return -1; | |
2285 | #endif | |
2286 | } | |
2287 | ||
e8a0464c DM |
2288 | static struct netdev_queue *dev_pick_tx(struct net_device *dev, |
2289 | struct sk_buff *skb) | |
2290 | { | |
b0f77d0e | 2291 | int queue_index; |
deabc772 | 2292 | const struct net_device_ops *ops = dev->netdev_ops; |
a4ee3ce3 | 2293 | |
3853b584 TH |
2294 | if (dev->real_num_tx_queues == 1) |
2295 | queue_index = 0; | |
2296 | else if (ops->ndo_select_queue) { | |
deabc772 HS |
2297 | queue_index = ops->ndo_select_queue(dev, skb); |
2298 | queue_index = dev_cap_txqueue(dev, queue_index); | |
2299 | } else { | |
2300 | struct sock *sk = skb->sk; | |
2301 | queue_index = sk_tx_queue_get(sk); | |
a4ee3ce3 | 2302 | |
3853b584 TH |
2303 | if (queue_index < 0 || skb->ooo_okay || |
2304 | queue_index >= dev->real_num_tx_queues) { | |
2305 | int old_index = queue_index; | |
fd2ea0a7 | 2306 | |
1d24eb48 TH |
2307 | queue_index = get_xps_queue(dev, skb); |
2308 | if (queue_index < 0) | |
2309 | queue_index = skb_tx_hash(dev, skb); | |
3853b584 TH |
2310 | |
2311 | if (queue_index != old_index && sk) { | |
2312 | struct dst_entry *dst = | |
2313 | rcu_dereference_check(sk->sk_dst_cache, 1); | |
8728c544 ED |
2314 | |
2315 | if (dst && skb_dst(skb) == dst) | |
2316 | sk_tx_queue_set(sk, queue_index); | |
2317 | } | |
a4ee3ce3 KK |
2318 | } |
2319 | } | |
eae792b7 | 2320 | |
fd2ea0a7 DM |
2321 | skb_set_queue_mapping(skb, queue_index); |
2322 | return netdev_get_tx_queue(dev, queue_index); | |
e8a0464c DM |
2323 | } |
2324 | ||
bbd8a0d3 KK |
2325 | static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q, |
2326 | struct net_device *dev, | |
2327 | struct netdev_queue *txq) | |
2328 | { | |
2329 | spinlock_t *root_lock = qdisc_lock(q); | |
a2da570d | 2330 | bool contended; |
bbd8a0d3 KK |
2331 | int rc; |
2332 | ||
a2da570d ED |
2333 | qdisc_skb_cb(skb)->pkt_len = skb->len; |
2334 | qdisc_calculate_pkt_len(skb, q); | |
79640a4c ED |
2335 | /* |
2336 | * Heuristic to force contended enqueues to serialize on a | |
2337 | * separate lock before trying to get qdisc main lock. | |
2338 | * This permits __QDISC_STATE_RUNNING owner to get the lock more often | |
2339 | * and dequeue packets faster. | |
2340 | */ | |
a2da570d | 2341 | contended = qdisc_is_running(q); |
79640a4c ED |
2342 | if (unlikely(contended)) |
2343 | spin_lock(&q->busylock); | |
2344 | ||
bbd8a0d3 KK |
2345 | spin_lock(root_lock); |
2346 | if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) { | |
2347 | kfree_skb(skb); | |
2348 | rc = NET_XMIT_DROP; | |
2349 | } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) && | |
bc135b23 | 2350 | qdisc_run_begin(q)) { |
bbd8a0d3 KK |
2351 | /* |
2352 | * This is a work-conserving queue; there are no old skbs | |
2353 | * waiting to be sent out; and the qdisc is not running - | |
2354 | * xmit the skb directly. | |
2355 | */ | |
7fee226a ED |
2356 | if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE)) |
2357 | skb_dst_force(skb); | |
bfe0d029 | 2358 | |
bfe0d029 ED |
2359 | qdisc_bstats_update(q, skb); |
2360 | ||
79640a4c ED |
2361 | if (sch_direct_xmit(skb, q, dev, txq, root_lock)) { |
2362 | if (unlikely(contended)) { | |
2363 | spin_unlock(&q->busylock); | |
2364 | contended = false; | |
2365 | } | |
bbd8a0d3 | 2366 | __qdisc_run(q); |
79640a4c | 2367 | } else |
bc135b23 | 2368 | qdisc_run_end(q); |
bbd8a0d3 KK |
2369 | |
2370 | rc = NET_XMIT_SUCCESS; | |
2371 | } else { | |
7fee226a | 2372 | skb_dst_force(skb); |
a2da570d | 2373 | rc = q->enqueue(skb, q) & NET_XMIT_MASK; |
79640a4c ED |
2374 | if (qdisc_run_begin(q)) { |
2375 | if (unlikely(contended)) { | |
2376 | spin_unlock(&q->busylock); | |
2377 | contended = false; | |
2378 | } | |
2379 | __qdisc_run(q); | |
2380 | } | |
bbd8a0d3 KK |
2381 | } |
2382 | spin_unlock(root_lock); | |
79640a4c ED |
2383 | if (unlikely(contended)) |
2384 | spin_unlock(&q->busylock); | |
bbd8a0d3 KK |
2385 | return rc; |
2386 | } | |
2387 | ||
745e20f1 | 2388 | static DEFINE_PER_CPU(int, xmit_recursion); |
11a766ce | 2389 | #define RECURSION_LIMIT 10 |
745e20f1 | 2390 | |
d29f749e DJ |
2391 | /** |
2392 | * dev_queue_xmit - transmit a buffer | |
2393 | * @skb: buffer to transmit | |
2394 | * | |
2395 | * Queue a buffer for transmission to a network device. The caller must | |
2396 | * have set the device and priority and built the buffer before calling | |
2397 | * this function. The function can be called from an interrupt. | |
2398 | * | |
2399 | * A negative errno code is returned on a failure. A success does not | |
2400 | * guarantee the frame will be transmitted as it may be dropped due | |
2401 | * to congestion or traffic shaping. | |
2402 | * | |
2403 | * ----------------------------------------------------------------------------------- | |
2404 | * I notice this method can also return errors from the queue disciplines, | |
2405 | * including NET_XMIT_DROP, which is a positive value. So, errors can also | |
2406 | * be positive. | |
2407 | * | |
2408 | * Regardless of the return value, the skb is consumed, so it is currently | |
2409 | * difficult to retry a send to this method. (You can bump the ref count | |
2410 | * before sending to hold a reference for retry if you are careful.) | |
2411 | * | |
2412 | * When calling this method, interrupts MUST be enabled. This is because | |
2413 | * the BH enable code must have IRQs enabled so that it will not deadlock. | |
2414 | * --BLG | |
2415 | */ | |
1da177e4 LT |
2416 | int dev_queue_xmit(struct sk_buff *skb) |
2417 | { | |
2418 | struct net_device *dev = skb->dev; | |
dc2b4847 | 2419 | struct netdev_queue *txq; |
1da177e4 LT |
2420 | struct Qdisc *q; |
2421 | int rc = -ENOMEM; | |
2422 | ||
4ec93edb YH |
2423 | /* Disable soft irqs for various locks below. Also |
2424 | * stops preemption for RCU. | |
1da177e4 | 2425 | */ |
4ec93edb | 2426 | rcu_read_lock_bh(); |
1da177e4 | 2427 | |
eae792b7 | 2428 | txq = dev_pick_tx(dev, skb); |
a898def2 | 2429 | q = rcu_dereference_bh(txq->qdisc); |
37437bb2 | 2430 | |
1da177e4 | 2431 | #ifdef CONFIG_NET_CLS_ACT |
d1b19dff | 2432 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS); |
1da177e4 | 2433 | #endif |
cf66ba58 | 2434 | trace_net_dev_queue(skb); |
1da177e4 | 2435 | if (q->enqueue) { |
bbd8a0d3 | 2436 | rc = __dev_xmit_skb(skb, q, dev, txq); |
37437bb2 | 2437 | goto out; |
1da177e4 LT |
2438 | } |
2439 | ||
2440 | /* The device has no queue. Common case for software devices: | |
2441 | loopback, all the sorts of tunnels... | |
2442 | ||
932ff279 HX |
2443 | Really, it is unlikely that netif_tx_lock protection is necessary |
2444 | here. (f.e. loopback and IP tunnels are clean ignoring statistics | |
1da177e4 LT |
2445 | counters.) |
2446 | However, it is possible, that they rely on protection | |
2447 | made by us here. | |
2448 | ||
2449 | Check this and shot the lock. It is not prone from deadlocks. | |
2450 | Either shot noqueue qdisc, it is even simpler 8) | |
2451 | */ | |
2452 | if (dev->flags & IFF_UP) { | |
2453 | int cpu = smp_processor_id(); /* ok because BHs are off */ | |
2454 | ||
c773e847 | 2455 | if (txq->xmit_lock_owner != cpu) { |
1da177e4 | 2456 | |
745e20f1 ED |
2457 | if (__this_cpu_read(xmit_recursion) > RECURSION_LIMIT) |
2458 | goto recursion_alert; | |
2459 | ||
c773e847 | 2460 | HARD_TX_LOCK(dev, txq, cpu); |
1da177e4 | 2461 | |
fd2ea0a7 | 2462 | if (!netif_tx_queue_stopped(txq)) { |
745e20f1 | 2463 | __this_cpu_inc(xmit_recursion); |
572a9d7b | 2464 | rc = dev_hard_start_xmit(skb, dev, txq); |
745e20f1 | 2465 | __this_cpu_dec(xmit_recursion); |
572a9d7b | 2466 | if (dev_xmit_complete(rc)) { |
c773e847 | 2467 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
2468 | goto out; |
2469 | } | |
2470 | } | |
c773e847 | 2471 | HARD_TX_UNLOCK(dev, txq); |
1da177e4 LT |
2472 | if (net_ratelimit()) |
2473 | printk(KERN_CRIT "Virtual device %s asks to " | |
2474 | "queue packet!\n", dev->name); | |
2475 | } else { | |
2476 | /* Recursion is detected! It is possible, | |
745e20f1 ED |
2477 | * unfortunately |
2478 | */ | |
2479 | recursion_alert: | |
1da177e4 LT |
2480 | if (net_ratelimit()) |
2481 | printk(KERN_CRIT "Dead loop on virtual device " | |
2482 | "%s, fix it urgently!\n", dev->name); | |
2483 | } | |
2484 | } | |
2485 | ||
2486 | rc = -ENETDOWN; | |
d4828d85 | 2487 | rcu_read_unlock_bh(); |
1da177e4 | 2488 | |
1da177e4 LT |
2489 | kfree_skb(skb); |
2490 | return rc; | |
2491 | out: | |
d4828d85 | 2492 | rcu_read_unlock_bh(); |
1da177e4 LT |
2493 | return rc; |
2494 | } | |
d1b19dff | 2495 | EXPORT_SYMBOL(dev_queue_xmit); |
1da177e4 LT |
2496 | |
2497 | ||
2498 | /*======================================================================= | |
2499 | Receiver routines | |
2500 | =======================================================================*/ | |
2501 | ||
6b2bedc3 | 2502 | int netdev_max_backlog __read_mostly = 1000; |
3b098e2d | 2503 | int netdev_tstamp_prequeue __read_mostly = 1; |
6b2bedc3 SH |
2504 | int netdev_budget __read_mostly = 300; |
2505 | int weight_p __read_mostly = 64; /* old backlog weight */ | |
1da177e4 | 2506 | |
eecfd7c4 ED |
2507 | /* Called with irq disabled */ |
2508 | static inline void ____napi_schedule(struct softnet_data *sd, | |
2509 | struct napi_struct *napi) | |
2510 | { | |
2511 | list_add_tail(&napi->poll_list, &sd->poll_list); | |
2512 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
2513 | } | |
2514 | ||
0a9627f2 | 2515 | /* |
bfb564e7 KK |
2516 | * __skb_get_rxhash: calculate a flow hash based on src/dst addresses |
2517 | * and src/dst port numbers. Returns a non-zero hash number on success | |
2518 | * and 0 on failure. | |
0a9627f2 | 2519 | */ |
bfb564e7 | 2520 | __u32 __skb_get_rxhash(struct sk_buff *skb) |
0a9627f2 | 2521 | { |
12fcdefb | 2522 | int nhoff, hash = 0, poff; |
0a9627f2 TH |
2523 | struct ipv6hdr *ip6; |
2524 | struct iphdr *ip; | |
0a9627f2 | 2525 | u8 ip_proto; |
8c52d509 CG |
2526 | u32 addr1, addr2, ihl; |
2527 | union { | |
2528 | u32 v32; | |
2529 | u16 v16[2]; | |
2530 | } ports; | |
0a9627f2 | 2531 | |
bfb564e7 | 2532 | nhoff = skb_network_offset(skb); |
0a9627f2 TH |
2533 | |
2534 | switch (skb->protocol) { | |
2535 | case __constant_htons(ETH_P_IP): | |
bfb564e7 | 2536 | if (!pskb_may_pull(skb, sizeof(*ip) + nhoff)) |
0a9627f2 TH |
2537 | goto done; |
2538 | ||
1003489e | 2539 | ip = (struct iphdr *) (skb->data + nhoff); |
dbe5775b CG |
2540 | if (ip->frag_off & htons(IP_MF | IP_OFFSET)) |
2541 | ip_proto = 0; | |
2542 | else | |
2543 | ip_proto = ip->protocol; | |
b249dcb8 ED |
2544 | addr1 = (__force u32) ip->saddr; |
2545 | addr2 = (__force u32) ip->daddr; | |
0a9627f2 TH |
2546 | ihl = ip->ihl; |
2547 | break; | |
2548 | case __constant_htons(ETH_P_IPV6): | |
bfb564e7 | 2549 | if (!pskb_may_pull(skb, sizeof(*ip6) + nhoff)) |
0a9627f2 TH |
2550 | goto done; |
2551 | ||
1003489e | 2552 | ip6 = (struct ipv6hdr *) (skb->data + nhoff); |
0a9627f2 | 2553 | ip_proto = ip6->nexthdr; |
b249dcb8 ED |
2554 | addr1 = (__force u32) ip6->saddr.s6_addr32[3]; |
2555 | addr2 = (__force u32) ip6->daddr.s6_addr32[3]; | |
0a9627f2 TH |
2556 | ihl = (40 >> 2); |
2557 | break; | |
2558 | default: | |
2559 | goto done; | |
2560 | } | |
bfb564e7 | 2561 | |
12fcdefb CG |
2562 | ports.v32 = 0; |
2563 | poff = proto_ports_offset(ip_proto); | |
2564 | if (poff >= 0) { | |
2565 | nhoff += ihl * 4 + poff; | |
2566 | if (pskb_may_pull(skb, nhoff + 4)) { | |
2567 | ports.v32 = * (__force u32 *) (skb->data + nhoff); | |
8c52d509 CG |
2568 | if (ports.v16[1] < ports.v16[0]) |
2569 | swap(ports.v16[0], ports.v16[1]); | |
b249dcb8 | 2570 | } |
0a9627f2 TH |
2571 | } |
2572 | ||
b249dcb8 ED |
2573 | /* get a consistent hash (same value on both flow directions) */ |
2574 | if (addr2 < addr1) | |
2575 | swap(addr1, addr2); | |
0a9627f2 | 2576 | |
bfb564e7 KK |
2577 | hash = jhash_3words(addr1, addr2, ports.v32, hashrnd); |
2578 | if (!hash) | |
2579 | hash = 1; | |
2580 | ||
2581 | done: | |
2582 | return hash; | |
2583 | } | |
2584 | EXPORT_SYMBOL(__skb_get_rxhash); | |
2585 | ||
2586 | #ifdef CONFIG_RPS | |
2587 | ||
2588 | /* One global table that all flow-based protocols share. */ | |
6e3f7faf | 2589 | struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly; |
bfb564e7 KK |
2590 | EXPORT_SYMBOL(rps_sock_flow_table); |
2591 | ||
c445477d BH |
2592 | static struct rps_dev_flow * |
2593 | set_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
2594 | struct rps_dev_flow *rflow, u16 next_cpu) | |
2595 | { | |
2596 | u16 tcpu; | |
2597 | ||
2598 | tcpu = rflow->cpu = next_cpu; | |
2599 | if (tcpu != RPS_NO_CPU) { | |
2600 | #ifdef CONFIG_RFS_ACCEL | |
2601 | struct netdev_rx_queue *rxqueue; | |
2602 | struct rps_dev_flow_table *flow_table; | |
2603 | struct rps_dev_flow *old_rflow; | |
2604 | u32 flow_id; | |
2605 | u16 rxq_index; | |
2606 | int rc; | |
2607 | ||
2608 | /* Should we steer this flow to a different hardware queue? */ | |
2609 | if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap) | |
2610 | goto out; | |
2611 | rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu); | |
2612 | if (rxq_index == skb_get_rx_queue(skb)) | |
2613 | goto out; | |
2614 | ||
2615 | rxqueue = dev->_rx + rxq_index; | |
2616 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
2617 | if (!flow_table) | |
2618 | goto out; | |
2619 | flow_id = skb->rxhash & flow_table->mask; | |
2620 | rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb, | |
2621 | rxq_index, flow_id); | |
2622 | if (rc < 0) | |
2623 | goto out; | |
2624 | old_rflow = rflow; | |
2625 | rflow = &flow_table->flows[flow_id]; | |
2626 | rflow->cpu = next_cpu; | |
2627 | rflow->filter = rc; | |
2628 | if (old_rflow->filter == rflow->filter) | |
2629 | old_rflow->filter = RPS_NO_FILTER; | |
2630 | out: | |
2631 | #endif | |
2632 | rflow->last_qtail = | |
2633 | per_cpu(softnet_data, tcpu).input_queue_head; | |
2634 | } | |
2635 | ||
2636 | return rflow; | |
2637 | } | |
2638 | ||
bfb564e7 KK |
2639 | /* |
2640 | * get_rps_cpu is called from netif_receive_skb and returns the target | |
2641 | * CPU from the RPS map of the receiving queue for a given skb. | |
2642 | * rcu_read_lock must be held on entry. | |
2643 | */ | |
2644 | static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb, | |
2645 | struct rps_dev_flow **rflowp) | |
2646 | { | |
2647 | struct netdev_rx_queue *rxqueue; | |
6e3f7faf | 2648 | struct rps_map *map; |
bfb564e7 KK |
2649 | struct rps_dev_flow_table *flow_table; |
2650 | struct rps_sock_flow_table *sock_flow_table; | |
2651 | int cpu = -1; | |
2652 | u16 tcpu; | |
2653 | ||
2654 | if (skb_rx_queue_recorded(skb)) { | |
2655 | u16 index = skb_get_rx_queue(skb); | |
62fe0b40 BH |
2656 | if (unlikely(index >= dev->real_num_rx_queues)) { |
2657 | WARN_ONCE(dev->real_num_rx_queues > 1, | |
2658 | "%s received packet on queue %u, but number " | |
2659 | "of RX queues is %u\n", | |
2660 | dev->name, index, dev->real_num_rx_queues); | |
bfb564e7 KK |
2661 | goto done; |
2662 | } | |
2663 | rxqueue = dev->_rx + index; | |
2664 | } else | |
2665 | rxqueue = dev->_rx; | |
2666 | ||
6e3f7faf ED |
2667 | map = rcu_dereference(rxqueue->rps_map); |
2668 | if (map) { | |
2669 | if (map->len == 1) { | |
6febfca9 CG |
2670 | tcpu = map->cpus[0]; |
2671 | if (cpu_online(tcpu)) | |
2672 | cpu = tcpu; | |
2673 | goto done; | |
2674 | } | |
6e3f7faf | 2675 | } else if (!rcu_dereference_raw(rxqueue->rps_flow_table)) { |
bfb564e7 | 2676 | goto done; |
6febfca9 | 2677 | } |
bfb564e7 | 2678 | |
2d47b459 | 2679 | skb_reset_network_header(skb); |
bfb564e7 KK |
2680 | if (!skb_get_rxhash(skb)) |
2681 | goto done; | |
2682 | ||
fec5e652 TH |
2683 | flow_table = rcu_dereference(rxqueue->rps_flow_table); |
2684 | sock_flow_table = rcu_dereference(rps_sock_flow_table); | |
2685 | if (flow_table && sock_flow_table) { | |
2686 | u16 next_cpu; | |
2687 | struct rps_dev_flow *rflow; | |
2688 | ||
2689 | rflow = &flow_table->flows[skb->rxhash & flow_table->mask]; | |
2690 | tcpu = rflow->cpu; | |
2691 | ||
2692 | next_cpu = sock_flow_table->ents[skb->rxhash & | |
2693 | sock_flow_table->mask]; | |
2694 | ||
2695 | /* | |
2696 | * If the desired CPU (where last recvmsg was done) is | |
2697 | * different from current CPU (one in the rx-queue flow | |
2698 | * table entry), switch if one of the following holds: | |
2699 | * - Current CPU is unset (equal to RPS_NO_CPU). | |
2700 | * - Current CPU is offline. | |
2701 | * - The current CPU's queue tail has advanced beyond the | |
2702 | * last packet that was enqueued using this table entry. | |
2703 | * This guarantees that all previous packets for the flow | |
2704 | * have been dequeued, thus preserving in order delivery. | |
2705 | */ | |
2706 | if (unlikely(tcpu != next_cpu) && | |
2707 | (tcpu == RPS_NO_CPU || !cpu_online(tcpu) || | |
2708 | ((int)(per_cpu(softnet_data, tcpu).input_queue_head - | |
c445477d BH |
2709 | rflow->last_qtail)) >= 0)) |
2710 | rflow = set_rps_cpu(dev, skb, rflow, next_cpu); | |
2711 | ||
fec5e652 TH |
2712 | if (tcpu != RPS_NO_CPU && cpu_online(tcpu)) { |
2713 | *rflowp = rflow; | |
2714 | cpu = tcpu; | |
2715 | goto done; | |
2716 | } | |
2717 | } | |
2718 | ||
0a9627f2 | 2719 | if (map) { |
fec5e652 | 2720 | tcpu = map->cpus[((u64) skb->rxhash * map->len) >> 32]; |
0a9627f2 TH |
2721 | |
2722 | if (cpu_online(tcpu)) { | |
2723 | cpu = tcpu; | |
2724 | goto done; | |
2725 | } | |
2726 | } | |
2727 | ||
2728 | done: | |
0a9627f2 TH |
2729 | return cpu; |
2730 | } | |
2731 | ||
c445477d BH |
2732 | #ifdef CONFIG_RFS_ACCEL |
2733 | ||
2734 | /** | |
2735 | * rps_may_expire_flow - check whether an RFS hardware filter may be removed | |
2736 | * @dev: Device on which the filter was set | |
2737 | * @rxq_index: RX queue index | |
2738 | * @flow_id: Flow ID passed to ndo_rx_flow_steer() | |
2739 | * @filter_id: Filter ID returned by ndo_rx_flow_steer() | |
2740 | * | |
2741 | * Drivers that implement ndo_rx_flow_steer() should periodically call | |
2742 | * this function for each installed filter and remove the filters for | |
2743 | * which it returns %true. | |
2744 | */ | |
2745 | bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, | |
2746 | u32 flow_id, u16 filter_id) | |
2747 | { | |
2748 | struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index; | |
2749 | struct rps_dev_flow_table *flow_table; | |
2750 | struct rps_dev_flow *rflow; | |
2751 | bool expire = true; | |
2752 | int cpu; | |
2753 | ||
2754 | rcu_read_lock(); | |
2755 | flow_table = rcu_dereference(rxqueue->rps_flow_table); | |
2756 | if (flow_table && flow_id <= flow_table->mask) { | |
2757 | rflow = &flow_table->flows[flow_id]; | |
2758 | cpu = ACCESS_ONCE(rflow->cpu); | |
2759 | if (rflow->filter == filter_id && cpu != RPS_NO_CPU && | |
2760 | ((int)(per_cpu(softnet_data, cpu).input_queue_head - | |
2761 | rflow->last_qtail) < | |
2762 | (int)(10 * flow_table->mask))) | |
2763 | expire = false; | |
2764 | } | |
2765 | rcu_read_unlock(); | |
2766 | return expire; | |
2767 | } | |
2768 | EXPORT_SYMBOL(rps_may_expire_flow); | |
2769 | ||
2770 | #endif /* CONFIG_RFS_ACCEL */ | |
2771 | ||
0a9627f2 | 2772 | /* Called from hardirq (IPI) context */ |
e36fa2f7 | 2773 | static void rps_trigger_softirq(void *data) |
0a9627f2 | 2774 | { |
e36fa2f7 ED |
2775 | struct softnet_data *sd = data; |
2776 | ||
eecfd7c4 | 2777 | ____napi_schedule(sd, &sd->backlog); |
dee42870 | 2778 | sd->received_rps++; |
0a9627f2 | 2779 | } |
e36fa2f7 | 2780 | |
fec5e652 | 2781 | #endif /* CONFIG_RPS */ |
0a9627f2 | 2782 | |
e36fa2f7 ED |
2783 | /* |
2784 | * Check if this softnet_data structure is another cpu one | |
2785 | * If yes, queue it to our IPI list and return 1 | |
2786 | * If no, return 0 | |
2787 | */ | |
2788 | static int rps_ipi_queued(struct softnet_data *sd) | |
2789 | { | |
2790 | #ifdef CONFIG_RPS | |
2791 | struct softnet_data *mysd = &__get_cpu_var(softnet_data); | |
2792 | ||
2793 | if (sd != mysd) { | |
2794 | sd->rps_ipi_next = mysd->rps_ipi_list; | |
2795 | mysd->rps_ipi_list = sd; | |
2796 | ||
2797 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); | |
2798 | return 1; | |
2799 | } | |
2800 | #endif /* CONFIG_RPS */ | |
2801 | return 0; | |
2802 | } | |
2803 | ||
0a9627f2 TH |
2804 | /* |
2805 | * enqueue_to_backlog is called to queue an skb to a per CPU backlog | |
2806 | * queue (may be a remote CPU queue). | |
2807 | */ | |
fec5e652 TH |
2808 | static int enqueue_to_backlog(struct sk_buff *skb, int cpu, |
2809 | unsigned int *qtail) | |
0a9627f2 | 2810 | { |
e36fa2f7 | 2811 | struct softnet_data *sd; |
0a9627f2 TH |
2812 | unsigned long flags; |
2813 | ||
e36fa2f7 | 2814 | sd = &per_cpu(softnet_data, cpu); |
0a9627f2 TH |
2815 | |
2816 | local_irq_save(flags); | |
0a9627f2 | 2817 | |
e36fa2f7 | 2818 | rps_lock(sd); |
6e7676c1 CG |
2819 | if (skb_queue_len(&sd->input_pkt_queue) <= netdev_max_backlog) { |
2820 | if (skb_queue_len(&sd->input_pkt_queue)) { | |
0a9627f2 | 2821 | enqueue: |
e36fa2f7 | 2822 | __skb_queue_tail(&sd->input_pkt_queue, skb); |
76cc8b13 | 2823 | input_queue_tail_incr_save(sd, qtail); |
e36fa2f7 | 2824 | rps_unlock(sd); |
152102c7 | 2825 | local_irq_restore(flags); |
0a9627f2 TH |
2826 | return NET_RX_SUCCESS; |
2827 | } | |
2828 | ||
ebda37c2 ED |
2829 | /* Schedule NAPI for backlog device |
2830 | * We can use non atomic operation since we own the queue lock | |
2831 | */ | |
2832 | if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) { | |
e36fa2f7 | 2833 | if (!rps_ipi_queued(sd)) |
eecfd7c4 | 2834 | ____napi_schedule(sd, &sd->backlog); |
0a9627f2 TH |
2835 | } |
2836 | goto enqueue; | |
2837 | } | |
2838 | ||
dee42870 | 2839 | sd->dropped++; |
e36fa2f7 | 2840 | rps_unlock(sd); |
0a9627f2 | 2841 | |
0a9627f2 TH |
2842 | local_irq_restore(flags); |
2843 | ||
caf586e5 | 2844 | atomic_long_inc(&skb->dev->rx_dropped); |
0a9627f2 TH |
2845 | kfree_skb(skb); |
2846 | return NET_RX_DROP; | |
2847 | } | |
1da177e4 | 2848 | |
1da177e4 LT |
2849 | /** |
2850 | * netif_rx - post buffer to the network code | |
2851 | * @skb: buffer to post | |
2852 | * | |
2853 | * This function receives a packet from a device driver and queues it for | |
2854 | * the upper (protocol) levels to process. It always succeeds. The buffer | |
2855 | * may be dropped during processing for congestion control or by the | |
2856 | * protocol layers. | |
2857 | * | |
2858 | * return values: | |
2859 | * NET_RX_SUCCESS (no congestion) | |
1da177e4 LT |
2860 | * NET_RX_DROP (packet was dropped) |
2861 | * | |
2862 | */ | |
2863 | ||
2864 | int netif_rx(struct sk_buff *skb) | |
2865 | { | |
b0e28f1e | 2866 | int ret; |
1da177e4 LT |
2867 | |
2868 | /* if netpoll wants it, pretend we never saw it */ | |
2869 | if (netpoll_rx(skb)) | |
2870 | return NET_RX_DROP; | |
2871 | ||
3b098e2d ED |
2872 | if (netdev_tstamp_prequeue) |
2873 | net_timestamp_check(skb); | |
1da177e4 | 2874 | |
cf66ba58 | 2875 | trace_netif_rx(skb); |
df334545 | 2876 | #ifdef CONFIG_RPS |
b0e28f1e | 2877 | { |
fec5e652 | 2878 | struct rps_dev_flow voidflow, *rflow = &voidflow; |
b0e28f1e ED |
2879 | int cpu; |
2880 | ||
cece1945 | 2881 | preempt_disable(); |
b0e28f1e | 2882 | rcu_read_lock(); |
fec5e652 TH |
2883 | |
2884 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
b0e28f1e ED |
2885 | if (cpu < 0) |
2886 | cpu = smp_processor_id(); | |
fec5e652 TH |
2887 | |
2888 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
2889 | ||
b0e28f1e | 2890 | rcu_read_unlock(); |
cece1945 | 2891 | preempt_enable(); |
b0e28f1e | 2892 | } |
1e94d72f | 2893 | #else |
fec5e652 TH |
2894 | { |
2895 | unsigned int qtail; | |
2896 | ret = enqueue_to_backlog(skb, get_cpu(), &qtail); | |
2897 | put_cpu(); | |
2898 | } | |
1e94d72f | 2899 | #endif |
b0e28f1e | 2900 | return ret; |
1da177e4 | 2901 | } |
d1b19dff | 2902 | EXPORT_SYMBOL(netif_rx); |
1da177e4 LT |
2903 | |
2904 | int netif_rx_ni(struct sk_buff *skb) | |
2905 | { | |
2906 | int err; | |
2907 | ||
2908 | preempt_disable(); | |
2909 | err = netif_rx(skb); | |
2910 | if (local_softirq_pending()) | |
2911 | do_softirq(); | |
2912 | preempt_enable(); | |
2913 | ||
2914 | return err; | |
2915 | } | |
1da177e4 LT |
2916 | EXPORT_SYMBOL(netif_rx_ni); |
2917 | ||
1da177e4 LT |
2918 | static void net_tx_action(struct softirq_action *h) |
2919 | { | |
2920 | struct softnet_data *sd = &__get_cpu_var(softnet_data); | |
2921 | ||
2922 | if (sd->completion_queue) { | |
2923 | struct sk_buff *clist; | |
2924 | ||
2925 | local_irq_disable(); | |
2926 | clist = sd->completion_queue; | |
2927 | sd->completion_queue = NULL; | |
2928 | local_irq_enable(); | |
2929 | ||
2930 | while (clist) { | |
2931 | struct sk_buff *skb = clist; | |
2932 | clist = clist->next; | |
2933 | ||
547b792c | 2934 | WARN_ON(atomic_read(&skb->users)); |
07dc22e7 | 2935 | trace_kfree_skb(skb, net_tx_action); |
1da177e4 LT |
2936 | __kfree_skb(skb); |
2937 | } | |
2938 | } | |
2939 | ||
2940 | if (sd->output_queue) { | |
37437bb2 | 2941 | struct Qdisc *head; |
1da177e4 LT |
2942 | |
2943 | local_irq_disable(); | |
2944 | head = sd->output_queue; | |
2945 | sd->output_queue = NULL; | |
a9cbd588 | 2946 | sd->output_queue_tailp = &sd->output_queue; |
1da177e4 LT |
2947 | local_irq_enable(); |
2948 | ||
2949 | while (head) { | |
37437bb2 DM |
2950 | struct Qdisc *q = head; |
2951 | spinlock_t *root_lock; | |
2952 | ||
1da177e4 LT |
2953 | head = head->next_sched; |
2954 | ||
5fb66229 | 2955 | root_lock = qdisc_lock(q); |
37437bb2 | 2956 | if (spin_trylock(root_lock)) { |
def82a1d JP |
2957 | smp_mb__before_clear_bit(); |
2958 | clear_bit(__QDISC_STATE_SCHED, | |
2959 | &q->state); | |
37437bb2 DM |
2960 | qdisc_run(q); |
2961 | spin_unlock(root_lock); | |
1da177e4 | 2962 | } else { |
195648bb | 2963 | if (!test_bit(__QDISC_STATE_DEACTIVATED, |
e8a83e10 | 2964 | &q->state)) { |
195648bb | 2965 | __netif_reschedule(q); |
e8a83e10 JP |
2966 | } else { |
2967 | smp_mb__before_clear_bit(); | |
2968 | clear_bit(__QDISC_STATE_SCHED, | |
2969 | &q->state); | |
2970 | } | |
1da177e4 LT |
2971 | } |
2972 | } | |
2973 | } | |
2974 | } | |
2975 | ||
ab95bfe0 JP |
2976 | #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \ |
2977 | (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)) | |
da678292 MM |
2978 | /* This hook is defined here for ATM LANE */ |
2979 | int (*br_fdb_test_addr_hook)(struct net_device *dev, | |
2980 | unsigned char *addr) __read_mostly; | |
4fb019a0 | 2981 | EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook); |
da678292 | 2982 | #endif |
1da177e4 | 2983 | |
1da177e4 LT |
2984 | #ifdef CONFIG_NET_CLS_ACT |
2985 | /* TODO: Maybe we should just force sch_ingress to be compiled in | |
2986 | * when CONFIG_NET_CLS_ACT is? otherwise some useless instructions | |
2987 | * a compare and 2 stores extra right now if we dont have it on | |
2988 | * but have CONFIG_NET_CLS_ACT | |
4ec93edb | 2989 | * NOTE: This doesnt stop any functionality; if you dont have |
1da177e4 LT |
2990 | * the ingress scheduler, you just cant add policies on ingress. |
2991 | * | |
2992 | */ | |
24824a09 | 2993 | static int ing_filter(struct sk_buff *skb, struct netdev_queue *rxq) |
1da177e4 | 2994 | { |
1da177e4 | 2995 | struct net_device *dev = skb->dev; |
f697c3e8 | 2996 | u32 ttl = G_TC_RTTL(skb->tc_verd); |
555353cf DM |
2997 | int result = TC_ACT_OK; |
2998 | struct Qdisc *q; | |
4ec93edb | 2999 | |
de384830 SH |
3000 | if (unlikely(MAX_RED_LOOP < ttl++)) { |
3001 | if (net_ratelimit()) | |
3002 | pr_warning( "Redir loop detected Dropping packet (%d->%d)\n", | |
3003 | skb->skb_iif, dev->ifindex); | |
f697c3e8 HX |
3004 | return TC_ACT_SHOT; |
3005 | } | |
1da177e4 | 3006 | |
f697c3e8 HX |
3007 | skb->tc_verd = SET_TC_RTTL(skb->tc_verd, ttl); |
3008 | skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS); | |
1da177e4 | 3009 | |
83874000 | 3010 | q = rxq->qdisc; |
8d50b53d | 3011 | if (q != &noop_qdisc) { |
83874000 | 3012 | spin_lock(qdisc_lock(q)); |
a9312ae8 DM |
3013 | if (likely(!test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) |
3014 | result = qdisc_enqueue_root(skb, q); | |
83874000 DM |
3015 | spin_unlock(qdisc_lock(q)); |
3016 | } | |
f697c3e8 HX |
3017 | |
3018 | return result; | |
3019 | } | |
86e65da9 | 3020 | |
f697c3e8 HX |
3021 | static inline struct sk_buff *handle_ing(struct sk_buff *skb, |
3022 | struct packet_type **pt_prev, | |
3023 | int *ret, struct net_device *orig_dev) | |
3024 | { | |
24824a09 ED |
3025 | struct netdev_queue *rxq = rcu_dereference(skb->dev->ingress_queue); |
3026 | ||
3027 | if (!rxq || rxq->qdisc == &noop_qdisc) | |
f697c3e8 | 3028 | goto out; |
1da177e4 | 3029 | |
f697c3e8 HX |
3030 | if (*pt_prev) { |
3031 | *ret = deliver_skb(skb, *pt_prev, orig_dev); | |
3032 | *pt_prev = NULL; | |
1da177e4 LT |
3033 | } |
3034 | ||
24824a09 | 3035 | switch (ing_filter(skb, rxq)) { |
f697c3e8 HX |
3036 | case TC_ACT_SHOT: |
3037 | case TC_ACT_STOLEN: | |
3038 | kfree_skb(skb); | |
3039 | return NULL; | |
3040 | } | |
3041 | ||
3042 | out: | |
3043 | skb->tc_verd = 0; | |
3044 | return skb; | |
1da177e4 LT |
3045 | } |
3046 | #endif | |
3047 | ||
ab95bfe0 JP |
3048 | /** |
3049 | * netdev_rx_handler_register - register receive handler | |
3050 | * @dev: device to register a handler for | |
3051 | * @rx_handler: receive handler to register | |
93e2c32b | 3052 | * @rx_handler_data: data pointer that is used by rx handler |
ab95bfe0 JP |
3053 | * |
3054 | * Register a receive hander for a device. This handler will then be | |
3055 | * called from __netif_receive_skb. A negative errno code is returned | |
3056 | * on a failure. | |
3057 | * | |
3058 | * The caller must hold the rtnl_mutex. | |
3059 | */ | |
3060 | int netdev_rx_handler_register(struct net_device *dev, | |
93e2c32b JP |
3061 | rx_handler_func_t *rx_handler, |
3062 | void *rx_handler_data) | |
ab95bfe0 JP |
3063 | { |
3064 | ASSERT_RTNL(); | |
3065 | ||
3066 | if (dev->rx_handler) | |
3067 | return -EBUSY; | |
3068 | ||
93e2c32b | 3069 | rcu_assign_pointer(dev->rx_handler_data, rx_handler_data); |
ab95bfe0 JP |
3070 | rcu_assign_pointer(dev->rx_handler, rx_handler); |
3071 | ||
3072 | return 0; | |
3073 | } | |
3074 | EXPORT_SYMBOL_GPL(netdev_rx_handler_register); | |
3075 | ||
3076 | /** | |
3077 | * netdev_rx_handler_unregister - unregister receive handler | |
3078 | * @dev: device to unregister a handler from | |
3079 | * | |
3080 | * Unregister a receive hander from a device. | |
3081 | * | |
3082 | * The caller must hold the rtnl_mutex. | |
3083 | */ | |
3084 | void netdev_rx_handler_unregister(struct net_device *dev) | |
3085 | { | |
3086 | ||
3087 | ASSERT_RTNL(); | |
3088 | rcu_assign_pointer(dev->rx_handler, NULL); | |
93e2c32b | 3089 | rcu_assign_pointer(dev->rx_handler_data, NULL); |
ab95bfe0 JP |
3090 | } |
3091 | EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister); | |
3092 | ||
acbbc071 ED |
3093 | static inline void skb_bond_set_mac_by_master(struct sk_buff *skb, |
3094 | struct net_device *master) | |
3095 | { | |
3096 | if (skb->pkt_type == PACKET_HOST) { | |
3097 | u16 *dest = (u16 *) eth_hdr(skb)->h_dest; | |
3098 | ||
3099 | memcpy(dest, master->dev_addr, ETH_ALEN); | |
3100 | } | |
3101 | } | |
3102 | ||
3103 | /* On bonding slaves other than the currently active slave, suppress | |
3104 | * duplicates except for 802.3ad ETH_P_SLOW, alb non-mcast/bcast, and | |
3105 | * ARP on active-backup slaves with arp_validate enabled. | |
3106 | */ | |
3107 | int __skb_bond_should_drop(struct sk_buff *skb, struct net_device *master) | |
3108 | { | |
3109 | struct net_device *dev = skb->dev; | |
3110 | ||
3111 | if (master->priv_flags & IFF_MASTER_ARPMON) | |
3112 | dev->last_rx = jiffies; | |
3113 | ||
f350a0a8 JP |
3114 | if ((master->priv_flags & IFF_MASTER_ALB) && |
3115 | (master->priv_flags & IFF_BRIDGE_PORT)) { | |
acbbc071 ED |
3116 | /* Do address unmangle. The local destination address |
3117 | * will be always the one master has. Provides the right | |
3118 | * functionality in a bridge. | |
3119 | */ | |
3120 | skb_bond_set_mac_by_master(skb, master); | |
3121 | } | |
3122 | ||
3123 | if (dev->priv_flags & IFF_SLAVE_INACTIVE) { | |
3124 | if ((dev->priv_flags & IFF_SLAVE_NEEDARP) && | |
3125 | skb->protocol == __cpu_to_be16(ETH_P_ARP)) | |
3126 | return 0; | |
3127 | ||
3128 | if (master->priv_flags & IFF_MASTER_ALB) { | |
3129 | if (skb->pkt_type != PACKET_BROADCAST && | |
3130 | skb->pkt_type != PACKET_MULTICAST) | |
3131 | return 0; | |
3132 | } | |
3133 | if (master->priv_flags & IFF_MASTER_8023AD && | |
3134 | skb->protocol == __cpu_to_be16(ETH_P_SLOW)) | |
3135 | return 0; | |
3136 | ||
3137 | return 1; | |
3138 | } | |
3139 | return 0; | |
3140 | } | |
3141 | EXPORT_SYMBOL(__skb_bond_should_drop); | |
3142 | ||
10f744d2 | 3143 | static int __netif_receive_skb(struct sk_buff *skb) |
1da177e4 LT |
3144 | { |
3145 | struct packet_type *ptype, *pt_prev; | |
ab95bfe0 | 3146 | rx_handler_func_t *rx_handler; |
f2ccd8fa | 3147 | struct net_device *orig_dev; |
0641e4fb | 3148 | struct net_device *master; |
0d7a3681 | 3149 | struct net_device *null_or_orig; |
2df4a0fa | 3150 | struct net_device *orig_or_bond; |
1da177e4 | 3151 | int ret = NET_RX_DROP; |
252e3346 | 3152 | __be16 type; |
1da177e4 | 3153 | |
3b098e2d ED |
3154 | if (!netdev_tstamp_prequeue) |
3155 | net_timestamp_check(skb); | |
81bbb3d4 | 3156 | |
cf66ba58 | 3157 | trace_netif_receive_skb(skb); |
9b22ea56 | 3158 | |
1da177e4 | 3159 | /* if we've gotten here through NAPI, check netpoll */ |
bea3348e | 3160 | if (netpoll_receive_skb(skb)) |
1da177e4 LT |
3161 | return NET_RX_DROP; |
3162 | ||
8964be4a ED |
3163 | if (!skb->skb_iif) |
3164 | skb->skb_iif = skb->dev->ifindex; | |
86e65da9 | 3165 | |
597a264b JF |
3166 | /* |
3167 | * bonding note: skbs received on inactive slaves should only | |
3168 | * be delivered to pkt handlers that are exact matches. Also | |
3169 | * the deliver_no_wcard flag will be set. If packet handlers | |
3170 | * are sensitive to duplicate packets these skbs will need to | |
3701e513 | 3171 | * be dropped at the handler. |
597a264b | 3172 | */ |
0d7a3681 | 3173 | null_or_orig = NULL; |
cc9bd5ce | 3174 | orig_dev = skb->dev; |
0641e4fb | 3175 | master = ACCESS_ONCE(orig_dev->master); |
597a264b JF |
3176 | if (skb->deliver_no_wcard) |
3177 | null_or_orig = orig_dev; | |
3178 | else if (master) { | |
3179 | if (skb_bond_should_drop(skb, master)) { | |
3180 | skb->deliver_no_wcard = 1; | |
0d7a3681 | 3181 | null_or_orig = orig_dev; /* deliver only exact match */ |
597a264b | 3182 | } else |
0641e4fb | 3183 | skb->dev = master; |
cc9bd5ce | 3184 | } |
8f903c70 | 3185 | |
27f39c73 | 3186 | __this_cpu_inc(softnet_data.processed); |
c1d2bbe1 | 3187 | skb_reset_network_header(skb); |
badff6d0 | 3188 | skb_reset_transport_header(skb); |
b0e380b1 | 3189 | skb->mac_len = skb->network_header - skb->mac_header; |
1da177e4 LT |
3190 | |
3191 | pt_prev = NULL; | |
3192 | ||
3193 | rcu_read_lock(); | |
3194 | ||
3195 | #ifdef CONFIG_NET_CLS_ACT | |
3196 | if (skb->tc_verd & TC_NCLS) { | |
3197 | skb->tc_verd = CLR_TC_NCLS(skb->tc_verd); | |
3198 | goto ncls; | |
3199 | } | |
3200 | #endif | |
3201 | ||
3202 | list_for_each_entry_rcu(ptype, &ptype_all, list) { | |
f982307f JE |
3203 | if (ptype->dev == null_or_orig || ptype->dev == skb->dev || |
3204 | ptype->dev == orig_dev) { | |
4ec93edb | 3205 | if (pt_prev) |
f2ccd8fa | 3206 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
3207 | pt_prev = ptype; |
3208 | } | |
3209 | } | |
3210 | ||
3211 | #ifdef CONFIG_NET_CLS_ACT | |
f697c3e8 HX |
3212 | skb = handle_ing(skb, &pt_prev, &ret, orig_dev); |
3213 | if (!skb) | |
1da177e4 | 3214 | goto out; |
1da177e4 LT |
3215 | ncls: |
3216 | #endif | |
3217 | ||
ab95bfe0 JP |
3218 | /* Handle special case of bridge or macvlan */ |
3219 | rx_handler = rcu_dereference(skb->dev->rx_handler); | |
3220 | if (rx_handler) { | |
3221 | if (pt_prev) { | |
3222 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
3223 | pt_prev = NULL; | |
3224 | } | |
3225 | skb = rx_handler(skb); | |
3226 | if (!skb) | |
3227 | goto out; | |
3228 | } | |
1da177e4 | 3229 | |
3701e513 JG |
3230 | if (vlan_tx_tag_present(skb)) { |
3231 | if (pt_prev) { | |
3232 | ret = deliver_skb(skb, pt_prev, orig_dev); | |
3233 | pt_prev = NULL; | |
3234 | } | |
3235 | if (vlan_hwaccel_do_receive(&skb)) { | |
3236 | ret = __netif_receive_skb(skb); | |
3237 | goto out; | |
3238 | } else if (unlikely(!skb)) | |
3239 | goto out; | |
3240 | } | |
3241 | ||
1f3c8804 AG |
3242 | /* |
3243 | * Make sure frames received on VLAN interfaces stacked on | |
3244 | * bonding interfaces still make their way to any base bonding | |
3245 | * device that may have registered for a specific ptype. The | |
3246 | * handler may have to adjust skb->dev and orig_dev. | |
1f3c8804 | 3247 | */ |
2df4a0fa | 3248 | orig_or_bond = orig_dev; |
1f3c8804 AG |
3249 | if ((skb->dev->priv_flags & IFF_802_1Q_VLAN) && |
3250 | (vlan_dev_real_dev(skb->dev)->priv_flags & IFF_BONDING)) { | |
2df4a0fa | 3251 | orig_or_bond = vlan_dev_real_dev(skb->dev); |
1f3c8804 AG |
3252 | } |
3253 | ||
1da177e4 | 3254 | type = skb->protocol; |
82d8a867 PE |
3255 | list_for_each_entry_rcu(ptype, |
3256 | &ptype_base[ntohs(type) & PTYPE_HASH_MASK], list) { | |
1f3c8804 | 3257 | if (ptype->type == type && (ptype->dev == null_or_orig || |
ca8d9ea3 | 3258 | ptype->dev == skb->dev || ptype->dev == orig_dev || |
2df4a0fa | 3259 | ptype->dev == orig_or_bond)) { |
4ec93edb | 3260 | if (pt_prev) |
f2ccd8fa | 3261 | ret = deliver_skb(skb, pt_prev, orig_dev); |
1da177e4 LT |
3262 | pt_prev = ptype; |
3263 | } | |
3264 | } | |
3265 | ||
3266 | if (pt_prev) { | |
f2ccd8fa | 3267 | ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev); |
1da177e4 | 3268 | } else { |
caf586e5 | 3269 | atomic_long_inc(&skb->dev->rx_dropped); |
1da177e4 LT |
3270 | kfree_skb(skb); |
3271 | /* Jamal, now you will not able to escape explaining | |
3272 | * me how you were going to use this. :-) | |
3273 | */ | |
3274 | ret = NET_RX_DROP; | |
3275 | } | |
3276 | ||
3277 | out: | |
3278 | rcu_read_unlock(); | |
3279 | return ret; | |
3280 | } | |
0a9627f2 TH |
3281 | |
3282 | /** | |
3283 | * netif_receive_skb - process receive buffer from network | |
3284 | * @skb: buffer to process | |
3285 | * | |
3286 | * netif_receive_skb() is the main receive data processing function. | |
3287 | * It always succeeds. The buffer may be dropped during processing | |
3288 | * for congestion control or by the protocol layers. | |
3289 | * | |
3290 | * This function may only be called from softirq context and interrupts | |
3291 | * should be enabled. | |
3292 | * | |
3293 | * Return values (usually ignored): | |
3294 | * NET_RX_SUCCESS: no congestion | |
3295 | * NET_RX_DROP: packet was dropped | |
3296 | */ | |
3297 | int netif_receive_skb(struct sk_buff *skb) | |
3298 | { | |
3b098e2d ED |
3299 | if (netdev_tstamp_prequeue) |
3300 | net_timestamp_check(skb); | |
3301 | ||
c1f19b51 RC |
3302 | if (skb_defer_rx_timestamp(skb)) |
3303 | return NET_RX_SUCCESS; | |
3304 | ||
df334545 | 3305 | #ifdef CONFIG_RPS |
3b098e2d ED |
3306 | { |
3307 | struct rps_dev_flow voidflow, *rflow = &voidflow; | |
3308 | int cpu, ret; | |
fec5e652 | 3309 | |
3b098e2d ED |
3310 | rcu_read_lock(); |
3311 | ||
3312 | cpu = get_rps_cpu(skb->dev, skb, &rflow); | |
0a9627f2 | 3313 | |
3b098e2d ED |
3314 | if (cpu >= 0) { |
3315 | ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail); | |
3316 | rcu_read_unlock(); | |
3317 | } else { | |
3318 | rcu_read_unlock(); | |
3319 | ret = __netif_receive_skb(skb); | |
3320 | } | |
0a9627f2 | 3321 | |
3b098e2d | 3322 | return ret; |
fec5e652 | 3323 | } |
1e94d72f TH |
3324 | #else |
3325 | return __netif_receive_skb(skb); | |
3326 | #endif | |
0a9627f2 | 3327 | } |
d1b19dff | 3328 | EXPORT_SYMBOL(netif_receive_skb); |
1da177e4 | 3329 | |
88751275 ED |
3330 | /* Network device is going away, flush any packets still pending |
3331 | * Called with irqs disabled. | |
3332 | */ | |
152102c7 | 3333 | static void flush_backlog(void *arg) |
6e583ce5 | 3334 | { |
152102c7 | 3335 | struct net_device *dev = arg; |
e36fa2f7 | 3336 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
6e583ce5 SH |
3337 | struct sk_buff *skb, *tmp; |
3338 | ||
e36fa2f7 | 3339 | rps_lock(sd); |
6e7676c1 | 3340 | skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) { |
6e583ce5 | 3341 | if (skb->dev == dev) { |
e36fa2f7 | 3342 | __skb_unlink(skb, &sd->input_pkt_queue); |
6e583ce5 | 3343 | kfree_skb(skb); |
76cc8b13 | 3344 | input_queue_head_incr(sd); |
6e583ce5 | 3345 | } |
6e7676c1 | 3346 | } |
e36fa2f7 | 3347 | rps_unlock(sd); |
6e7676c1 CG |
3348 | |
3349 | skb_queue_walk_safe(&sd->process_queue, skb, tmp) { | |
3350 | if (skb->dev == dev) { | |
3351 | __skb_unlink(skb, &sd->process_queue); | |
3352 | kfree_skb(skb); | |
76cc8b13 | 3353 | input_queue_head_incr(sd); |
6e7676c1 CG |
3354 | } |
3355 | } | |
6e583ce5 SH |
3356 | } |
3357 | ||
d565b0a1 HX |
3358 | static int napi_gro_complete(struct sk_buff *skb) |
3359 | { | |
3360 | struct packet_type *ptype; | |
3361 | __be16 type = skb->protocol; | |
3362 | struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; | |
3363 | int err = -ENOENT; | |
3364 | ||
fc59f9a3 HX |
3365 | if (NAPI_GRO_CB(skb)->count == 1) { |
3366 | skb_shinfo(skb)->gso_size = 0; | |
d565b0a1 | 3367 | goto out; |
fc59f9a3 | 3368 | } |
d565b0a1 HX |
3369 | |
3370 | rcu_read_lock(); | |
3371 | list_for_each_entry_rcu(ptype, head, list) { | |
3372 | if (ptype->type != type || ptype->dev || !ptype->gro_complete) | |
3373 | continue; | |
3374 | ||
3375 | err = ptype->gro_complete(skb); | |
3376 | break; | |
3377 | } | |
3378 | rcu_read_unlock(); | |
3379 | ||
3380 | if (err) { | |
3381 | WARN_ON(&ptype->list == head); | |
3382 | kfree_skb(skb); | |
3383 | return NET_RX_SUCCESS; | |
3384 | } | |
3385 | ||
3386 | out: | |
d565b0a1 HX |
3387 | return netif_receive_skb(skb); |
3388 | } | |
3389 | ||
86cac58b | 3390 | inline void napi_gro_flush(struct napi_struct *napi) |
d565b0a1 HX |
3391 | { |
3392 | struct sk_buff *skb, *next; | |
3393 | ||
3394 | for (skb = napi->gro_list; skb; skb = next) { | |
3395 | next = skb->next; | |
3396 | skb->next = NULL; | |
3397 | napi_gro_complete(skb); | |
3398 | } | |
3399 | ||
4ae5544f | 3400 | napi->gro_count = 0; |
d565b0a1 HX |
3401 | napi->gro_list = NULL; |
3402 | } | |
86cac58b | 3403 | EXPORT_SYMBOL(napi_gro_flush); |
d565b0a1 | 3404 | |
5b252f0c | 3405 | enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
d565b0a1 HX |
3406 | { |
3407 | struct sk_buff **pp = NULL; | |
3408 | struct packet_type *ptype; | |
3409 | __be16 type = skb->protocol; | |
3410 | struct list_head *head = &ptype_base[ntohs(type) & PTYPE_HASH_MASK]; | |
0da2afd5 | 3411 | int same_flow; |
d565b0a1 | 3412 | int mac_len; |
5b252f0c | 3413 | enum gro_result ret; |
d565b0a1 | 3414 | |
ce9e76c8 | 3415 | if (!(skb->dev->features & NETIF_F_GRO) || netpoll_rx_on(skb)) |
d565b0a1 HX |
3416 | goto normal; |
3417 | ||
21dc3301 | 3418 | if (skb_is_gso(skb) || skb_has_frag_list(skb)) |
f17f5c91 HX |
3419 | goto normal; |
3420 | ||
d565b0a1 HX |
3421 | rcu_read_lock(); |
3422 | list_for_each_entry_rcu(ptype, head, list) { | |
d565b0a1 HX |
3423 | if (ptype->type != type || ptype->dev || !ptype->gro_receive) |
3424 | continue; | |
3425 | ||
86911732 | 3426 | skb_set_network_header(skb, skb_gro_offset(skb)); |
d565b0a1 HX |
3427 | mac_len = skb->network_header - skb->mac_header; |
3428 | skb->mac_len = mac_len; | |
3429 | NAPI_GRO_CB(skb)->same_flow = 0; | |
3430 | NAPI_GRO_CB(skb)->flush = 0; | |
5d38a079 | 3431 | NAPI_GRO_CB(skb)->free = 0; |
d565b0a1 | 3432 | |
d565b0a1 HX |
3433 | pp = ptype->gro_receive(&napi->gro_list, skb); |
3434 | break; | |
3435 | } | |
3436 | rcu_read_unlock(); | |
3437 | ||
3438 | if (&ptype->list == head) | |
3439 | goto normal; | |
3440 | ||
0da2afd5 | 3441 | same_flow = NAPI_GRO_CB(skb)->same_flow; |
5d0d9be8 | 3442 | ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED; |
0da2afd5 | 3443 | |
d565b0a1 HX |
3444 | if (pp) { |
3445 | struct sk_buff *nskb = *pp; | |
3446 | ||
3447 | *pp = nskb->next; | |
3448 | nskb->next = NULL; | |
3449 | napi_gro_complete(nskb); | |
4ae5544f | 3450 | napi->gro_count--; |
d565b0a1 HX |
3451 | } |
3452 | ||
0da2afd5 | 3453 | if (same_flow) |
d565b0a1 HX |
3454 | goto ok; |
3455 | ||
4ae5544f | 3456 | if (NAPI_GRO_CB(skb)->flush || napi->gro_count >= MAX_GRO_SKBS) |
d565b0a1 | 3457 | goto normal; |
d565b0a1 | 3458 | |
4ae5544f | 3459 | napi->gro_count++; |
d565b0a1 | 3460 | NAPI_GRO_CB(skb)->count = 1; |
86911732 | 3461 | skb_shinfo(skb)->gso_size = skb_gro_len(skb); |
d565b0a1 HX |
3462 | skb->next = napi->gro_list; |
3463 | napi->gro_list = skb; | |
5d0d9be8 | 3464 | ret = GRO_HELD; |
d565b0a1 | 3465 | |
ad0f9904 | 3466 | pull: |
cb18978c HX |
3467 | if (skb_headlen(skb) < skb_gro_offset(skb)) { |
3468 | int grow = skb_gro_offset(skb) - skb_headlen(skb); | |
3469 | ||
3470 | BUG_ON(skb->end - skb->tail < grow); | |
3471 | ||
3472 | memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow); | |
3473 | ||
3474 | skb->tail += grow; | |
3475 | skb->data_len -= grow; | |
3476 | ||
3477 | skb_shinfo(skb)->frags[0].page_offset += grow; | |
3478 | skb_shinfo(skb)->frags[0].size -= grow; | |
3479 | ||
3480 | if (unlikely(!skb_shinfo(skb)->frags[0].size)) { | |
3481 | put_page(skb_shinfo(skb)->frags[0].page); | |
3482 | memmove(skb_shinfo(skb)->frags, | |
3483 | skb_shinfo(skb)->frags + 1, | |
e5093aec | 3484 | --skb_shinfo(skb)->nr_frags * sizeof(skb_frag_t)); |
cb18978c | 3485 | } |
ad0f9904 HX |
3486 | } |
3487 | ||
d565b0a1 | 3488 | ok: |
5d0d9be8 | 3489 | return ret; |
d565b0a1 HX |
3490 | |
3491 | normal: | |
ad0f9904 HX |
3492 | ret = GRO_NORMAL; |
3493 | goto pull; | |
5d38a079 | 3494 | } |
96e93eab HX |
3495 | EXPORT_SYMBOL(dev_gro_receive); |
3496 | ||
40d0802b | 3497 | static inline gro_result_t |
5b252f0c | 3498 | __napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
96e93eab HX |
3499 | { |
3500 | struct sk_buff *p; | |
3501 | ||
3502 | for (p = napi->gro_list; p; p = p->next) { | |
40d0802b ED |
3503 | unsigned long diffs; |
3504 | ||
3505 | diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev; | |
3701e513 | 3506 | diffs |= p->vlan_tci ^ skb->vlan_tci; |
40d0802b | 3507 | diffs |= compare_ether_header(skb_mac_header(p), |
f64f9e71 | 3508 | skb_gro_mac_header(skb)); |
40d0802b | 3509 | NAPI_GRO_CB(p)->same_flow = !diffs; |
96e93eab HX |
3510 | NAPI_GRO_CB(p)->flush = 0; |
3511 | } | |
3512 | ||
3513 | return dev_gro_receive(napi, skb); | |
3514 | } | |
5d38a079 | 3515 | |
c7c4b3b6 | 3516 | gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb) |
5d38a079 | 3517 | { |
5d0d9be8 HX |
3518 | switch (ret) { |
3519 | case GRO_NORMAL: | |
c7c4b3b6 BH |
3520 | if (netif_receive_skb(skb)) |
3521 | ret = GRO_DROP; | |
3522 | break; | |
5d38a079 | 3523 | |
5d0d9be8 | 3524 | case GRO_DROP: |
5d0d9be8 | 3525 | case GRO_MERGED_FREE: |
5d38a079 HX |
3526 | kfree_skb(skb); |
3527 | break; | |
5b252f0c BH |
3528 | |
3529 | case GRO_HELD: | |
3530 | case GRO_MERGED: | |
3531 | break; | |
5d38a079 HX |
3532 | } |
3533 | ||
c7c4b3b6 | 3534 | return ret; |
5d0d9be8 HX |
3535 | } |
3536 | EXPORT_SYMBOL(napi_skb_finish); | |
3537 | ||
78a478d0 HX |
3538 | void skb_gro_reset_offset(struct sk_buff *skb) |
3539 | { | |
3540 | NAPI_GRO_CB(skb)->data_offset = 0; | |
3541 | NAPI_GRO_CB(skb)->frag0 = NULL; | |
7489594c | 3542 | NAPI_GRO_CB(skb)->frag0_len = 0; |
78a478d0 | 3543 | |
78d3fd0b | 3544 | if (skb->mac_header == skb->tail && |
7489594c | 3545 | !PageHighMem(skb_shinfo(skb)->frags[0].page)) { |
78a478d0 HX |
3546 | NAPI_GRO_CB(skb)->frag0 = |
3547 | page_address(skb_shinfo(skb)->frags[0].page) + | |
3548 | skb_shinfo(skb)->frags[0].page_offset; | |
7489594c HX |
3549 | NAPI_GRO_CB(skb)->frag0_len = skb_shinfo(skb)->frags[0].size; |
3550 | } | |
78a478d0 HX |
3551 | } |
3552 | EXPORT_SYMBOL(skb_gro_reset_offset); | |
3553 | ||
c7c4b3b6 | 3554 | gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb) |
5d0d9be8 | 3555 | { |
86911732 HX |
3556 | skb_gro_reset_offset(skb); |
3557 | ||
5d0d9be8 | 3558 | return napi_skb_finish(__napi_gro_receive(napi, skb), skb); |
d565b0a1 HX |
3559 | } |
3560 | EXPORT_SYMBOL(napi_gro_receive); | |
3561 | ||
d0c2b0d2 | 3562 | static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb) |
96e93eab | 3563 | { |
96e93eab HX |
3564 | __skb_pull(skb, skb_headlen(skb)); |
3565 | skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb)); | |
3701e513 | 3566 | skb->vlan_tci = 0; |
96e93eab HX |
3567 | |
3568 | napi->skb = skb; | |
3569 | } | |
96e93eab | 3570 | |
76620aaf | 3571 | struct sk_buff *napi_get_frags(struct napi_struct *napi) |
5d38a079 | 3572 | { |
5d38a079 | 3573 | struct sk_buff *skb = napi->skb; |
5d38a079 HX |
3574 | |
3575 | if (!skb) { | |
89d71a66 ED |
3576 | skb = netdev_alloc_skb_ip_align(napi->dev, GRO_MAX_HEAD); |
3577 | if (skb) | |
3578 | napi->skb = skb; | |
80595d59 | 3579 | } |
96e93eab HX |
3580 | return skb; |
3581 | } | |
76620aaf | 3582 | EXPORT_SYMBOL(napi_get_frags); |
96e93eab | 3583 | |
c7c4b3b6 BH |
3584 | gro_result_t napi_frags_finish(struct napi_struct *napi, struct sk_buff *skb, |
3585 | gro_result_t ret) | |
96e93eab | 3586 | { |
5d0d9be8 HX |
3587 | switch (ret) { |
3588 | case GRO_NORMAL: | |
86911732 | 3589 | case GRO_HELD: |
e76b69cc | 3590 | skb->protocol = eth_type_trans(skb, skb->dev); |
86911732 | 3591 | |
c7c4b3b6 BH |
3592 | if (ret == GRO_HELD) |
3593 | skb_gro_pull(skb, -ETH_HLEN); | |
3594 | else if (netif_receive_skb(skb)) | |
3595 | ret = GRO_DROP; | |
86911732 | 3596 | break; |
5d38a079 | 3597 | |
5d0d9be8 | 3598 | case GRO_DROP: |
5d0d9be8 HX |
3599 | case GRO_MERGED_FREE: |
3600 | napi_reuse_skb(napi, skb); | |
3601 | break; | |
5b252f0c BH |
3602 | |
3603 | case GRO_MERGED: | |
3604 | break; | |
5d0d9be8 | 3605 | } |
5d38a079 | 3606 | |
c7c4b3b6 | 3607 | return ret; |
5d38a079 | 3608 | } |
5d0d9be8 HX |
3609 | EXPORT_SYMBOL(napi_frags_finish); |
3610 | ||
76620aaf HX |
3611 | struct sk_buff *napi_frags_skb(struct napi_struct *napi) |
3612 | { | |
3613 | struct sk_buff *skb = napi->skb; | |
3614 | struct ethhdr *eth; | |
a5b1cf28 HX |
3615 | unsigned int hlen; |
3616 | unsigned int off; | |
76620aaf HX |
3617 | |
3618 | napi->skb = NULL; | |
3619 | ||
3620 | skb_reset_mac_header(skb); | |
3621 | skb_gro_reset_offset(skb); | |
3622 | ||
a5b1cf28 HX |
3623 | off = skb_gro_offset(skb); |
3624 | hlen = off + sizeof(*eth); | |
3625 | eth = skb_gro_header_fast(skb, off); | |
3626 | if (skb_gro_header_hard(skb, hlen)) { | |
3627 | eth = skb_gro_header_slow(skb, hlen, off); | |
3628 | if (unlikely(!eth)) { | |
3629 | napi_reuse_skb(napi, skb); | |
3630 | skb = NULL; | |
3631 | goto out; | |
3632 | } | |
76620aaf HX |
3633 | } |
3634 | ||
3635 | skb_gro_pull(skb, sizeof(*eth)); | |
3636 | ||
3637 | /* | |
3638 | * This works because the only protocols we care about don't require | |
3639 | * special handling. We'll fix it up properly at the end. | |
3640 | */ | |
3641 | skb->protocol = eth->h_proto; | |
3642 | ||
3643 | out: | |
3644 | return skb; | |
3645 | } | |
3646 | EXPORT_SYMBOL(napi_frags_skb); | |
3647 | ||
c7c4b3b6 | 3648 | gro_result_t napi_gro_frags(struct napi_struct *napi) |
5d0d9be8 | 3649 | { |
76620aaf | 3650 | struct sk_buff *skb = napi_frags_skb(napi); |
5d0d9be8 HX |
3651 | |
3652 | if (!skb) | |
c7c4b3b6 | 3653 | return GRO_DROP; |
5d0d9be8 HX |
3654 | |
3655 | return napi_frags_finish(napi, skb, __napi_gro_receive(napi, skb)); | |
3656 | } | |
5d38a079 HX |
3657 | EXPORT_SYMBOL(napi_gro_frags); |
3658 | ||
e326bed2 ED |
3659 | /* |
3660 | * net_rps_action sends any pending IPI's for rps. | |
3661 | * Note: called with local irq disabled, but exits with local irq enabled. | |
3662 | */ | |
3663 | static void net_rps_action_and_irq_enable(struct softnet_data *sd) | |
3664 | { | |
3665 | #ifdef CONFIG_RPS | |
3666 | struct softnet_data *remsd = sd->rps_ipi_list; | |
3667 | ||
3668 | if (remsd) { | |
3669 | sd->rps_ipi_list = NULL; | |
3670 | ||
3671 | local_irq_enable(); | |
3672 | ||
3673 | /* Send pending IPI's to kick RPS processing on remote cpus. */ | |
3674 | while (remsd) { | |
3675 | struct softnet_data *next = remsd->rps_ipi_next; | |
3676 | ||
3677 | if (cpu_online(remsd->cpu)) | |
3678 | __smp_call_function_single(remsd->cpu, | |
3679 | &remsd->csd, 0); | |
3680 | remsd = next; | |
3681 | } | |
3682 | } else | |
3683 | #endif | |
3684 | local_irq_enable(); | |
3685 | } | |
3686 | ||
bea3348e | 3687 | static int process_backlog(struct napi_struct *napi, int quota) |
1da177e4 LT |
3688 | { |
3689 | int work = 0; | |
eecfd7c4 | 3690 | struct softnet_data *sd = container_of(napi, struct softnet_data, backlog); |
1da177e4 | 3691 | |
e326bed2 ED |
3692 | #ifdef CONFIG_RPS |
3693 | /* Check if we have pending ipi, its better to send them now, | |
3694 | * not waiting net_rx_action() end. | |
3695 | */ | |
3696 | if (sd->rps_ipi_list) { | |
3697 | local_irq_disable(); | |
3698 | net_rps_action_and_irq_enable(sd); | |
3699 | } | |
3700 | #endif | |
bea3348e | 3701 | napi->weight = weight_p; |
6e7676c1 CG |
3702 | local_irq_disable(); |
3703 | while (work < quota) { | |
1da177e4 | 3704 | struct sk_buff *skb; |
6e7676c1 CG |
3705 | unsigned int qlen; |
3706 | ||
3707 | while ((skb = __skb_dequeue(&sd->process_queue))) { | |
3708 | local_irq_enable(); | |
3709 | __netif_receive_skb(skb); | |
6e7676c1 | 3710 | local_irq_disable(); |
76cc8b13 TH |
3711 | input_queue_head_incr(sd); |
3712 | if (++work >= quota) { | |
3713 | local_irq_enable(); | |
3714 | return work; | |
3715 | } | |
6e7676c1 | 3716 | } |
1da177e4 | 3717 | |
e36fa2f7 | 3718 | rps_lock(sd); |
6e7676c1 | 3719 | qlen = skb_queue_len(&sd->input_pkt_queue); |
76cc8b13 | 3720 | if (qlen) |
6e7676c1 CG |
3721 | skb_queue_splice_tail_init(&sd->input_pkt_queue, |
3722 | &sd->process_queue); | |
76cc8b13 | 3723 | |
6e7676c1 | 3724 | if (qlen < quota - work) { |
eecfd7c4 ED |
3725 | /* |
3726 | * Inline a custom version of __napi_complete(). | |
3727 | * only current cpu owns and manipulates this napi, | |
3728 | * and NAPI_STATE_SCHED is the only possible flag set on backlog. | |
3729 | * we can use a plain write instead of clear_bit(), | |
3730 | * and we dont need an smp_mb() memory barrier. | |
3731 | */ | |
3732 | list_del(&napi->poll_list); | |
3733 | napi->state = 0; | |
3734 | ||
6e7676c1 | 3735 | quota = work + qlen; |
bea3348e | 3736 | } |
e36fa2f7 | 3737 | rps_unlock(sd); |
6e7676c1 CG |
3738 | } |
3739 | local_irq_enable(); | |
1da177e4 | 3740 | |
bea3348e SH |
3741 | return work; |
3742 | } | |
1da177e4 | 3743 | |
bea3348e SH |
3744 | /** |
3745 | * __napi_schedule - schedule for receive | |
c4ea43c5 | 3746 | * @n: entry to schedule |
bea3348e SH |
3747 | * |
3748 | * The entry's receive function will be scheduled to run | |
3749 | */ | |
b5606c2d | 3750 | void __napi_schedule(struct napi_struct *n) |
bea3348e SH |
3751 | { |
3752 | unsigned long flags; | |
1da177e4 | 3753 | |
bea3348e | 3754 | local_irq_save(flags); |
eecfd7c4 | 3755 | ____napi_schedule(&__get_cpu_var(softnet_data), n); |
bea3348e | 3756 | local_irq_restore(flags); |
1da177e4 | 3757 | } |
bea3348e SH |
3758 | EXPORT_SYMBOL(__napi_schedule); |
3759 | ||
d565b0a1 HX |
3760 | void __napi_complete(struct napi_struct *n) |
3761 | { | |
3762 | BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state)); | |
3763 | BUG_ON(n->gro_list); | |
3764 | ||
3765 | list_del(&n->poll_list); | |
3766 | smp_mb__before_clear_bit(); | |
3767 | clear_bit(NAPI_STATE_SCHED, &n->state); | |
3768 | } | |
3769 | EXPORT_SYMBOL(__napi_complete); | |
3770 | ||
3771 | void napi_complete(struct napi_struct *n) | |
3772 | { | |
3773 | unsigned long flags; | |
3774 | ||
3775 | /* | |
3776 | * don't let napi dequeue from the cpu poll list | |
3777 | * just in case its running on a different cpu | |
3778 | */ | |
3779 | if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state))) | |
3780 | return; | |
3781 | ||
3782 | napi_gro_flush(n); | |
3783 | local_irq_save(flags); | |
3784 | __napi_complete(n); | |
3785 | local_irq_restore(flags); | |
3786 | } | |
3787 | EXPORT_SYMBOL(napi_complete); | |
3788 | ||
3789 | void netif_napi_add(struct net_device *dev, struct napi_struct *napi, | |
3790 | int (*poll)(struct napi_struct *, int), int weight) | |
3791 | { | |
3792 | INIT_LIST_HEAD(&napi->poll_list); | |
4ae5544f | 3793 | napi->gro_count = 0; |
d565b0a1 | 3794 | napi->gro_list = NULL; |
5d38a079 | 3795 | napi->skb = NULL; |
d565b0a1 HX |
3796 | napi->poll = poll; |
3797 | napi->weight = weight; | |
3798 | list_add(&napi->dev_list, &dev->napi_list); | |
d565b0a1 | 3799 | napi->dev = dev; |
5d38a079 | 3800 | #ifdef CONFIG_NETPOLL |
d565b0a1 HX |
3801 | spin_lock_init(&napi->poll_lock); |
3802 | napi->poll_owner = -1; | |
3803 | #endif | |
3804 | set_bit(NAPI_STATE_SCHED, &napi->state); | |
3805 | } | |
3806 | EXPORT_SYMBOL(netif_napi_add); | |
3807 | ||
3808 | void netif_napi_del(struct napi_struct *napi) | |
3809 | { | |
3810 | struct sk_buff *skb, *next; | |
3811 | ||
d7b06636 | 3812 | list_del_init(&napi->dev_list); |
76620aaf | 3813 | napi_free_frags(napi); |
d565b0a1 HX |
3814 | |
3815 | for (skb = napi->gro_list; skb; skb = next) { | |
3816 | next = skb->next; | |
3817 | skb->next = NULL; | |
3818 | kfree_skb(skb); | |
3819 | } | |
3820 | ||
3821 | napi->gro_list = NULL; | |
4ae5544f | 3822 | napi->gro_count = 0; |
d565b0a1 HX |
3823 | } |
3824 | EXPORT_SYMBOL(netif_napi_del); | |
3825 | ||
1da177e4 LT |
3826 | static void net_rx_action(struct softirq_action *h) |
3827 | { | |
e326bed2 | 3828 | struct softnet_data *sd = &__get_cpu_var(softnet_data); |
24f8b238 | 3829 | unsigned long time_limit = jiffies + 2; |
51b0bded | 3830 | int budget = netdev_budget; |
53fb95d3 MM |
3831 | void *have; |
3832 | ||
1da177e4 LT |
3833 | local_irq_disable(); |
3834 | ||
e326bed2 | 3835 | while (!list_empty(&sd->poll_list)) { |
bea3348e SH |
3836 | struct napi_struct *n; |
3837 | int work, weight; | |
1da177e4 | 3838 | |
bea3348e | 3839 | /* If softirq window is exhuasted then punt. |
24f8b238 SH |
3840 | * Allow this to run for 2 jiffies since which will allow |
3841 | * an average latency of 1.5/HZ. | |
bea3348e | 3842 | */ |
24f8b238 | 3843 | if (unlikely(budget <= 0 || time_after(jiffies, time_limit))) |
1da177e4 LT |
3844 | goto softnet_break; |
3845 | ||
3846 | local_irq_enable(); | |
3847 | ||
bea3348e SH |
3848 | /* Even though interrupts have been re-enabled, this |
3849 | * access is safe because interrupts can only add new | |
3850 | * entries to the tail of this list, and only ->poll() | |
3851 | * calls can remove this head entry from the list. | |
3852 | */ | |
e326bed2 | 3853 | n = list_first_entry(&sd->poll_list, struct napi_struct, poll_list); |
1da177e4 | 3854 | |
bea3348e SH |
3855 | have = netpoll_poll_lock(n); |
3856 | ||
3857 | weight = n->weight; | |
3858 | ||
0a7606c1 DM |
3859 | /* This NAPI_STATE_SCHED test is for avoiding a race |
3860 | * with netpoll's poll_napi(). Only the entity which | |
3861 | * obtains the lock and sees NAPI_STATE_SCHED set will | |
3862 | * actually make the ->poll() call. Therefore we avoid | |
3863 | * accidently calling ->poll() when NAPI is not scheduled. | |
3864 | */ | |
3865 | work = 0; | |
4ea7e386 | 3866 | if (test_bit(NAPI_STATE_SCHED, &n->state)) { |
0a7606c1 | 3867 | work = n->poll(n, weight); |
4ea7e386 NH |
3868 | trace_napi_poll(n); |
3869 | } | |
bea3348e SH |
3870 | |
3871 | WARN_ON_ONCE(work > weight); | |
3872 | ||
3873 | budget -= work; | |
3874 | ||
3875 | local_irq_disable(); | |
3876 | ||
3877 | /* Drivers must not modify the NAPI state if they | |
3878 | * consume the entire weight. In such cases this code | |
3879 | * still "owns" the NAPI instance and therefore can | |
3880 | * move the instance around on the list at-will. | |
3881 | */ | |
fed17f30 | 3882 | if (unlikely(work == weight)) { |
ff780cd8 HX |
3883 | if (unlikely(napi_disable_pending(n))) { |
3884 | local_irq_enable(); | |
3885 | napi_complete(n); | |
3886 | local_irq_disable(); | |
3887 | } else | |
e326bed2 | 3888 | list_move_tail(&n->poll_list, &sd->poll_list); |
fed17f30 | 3889 | } |
bea3348e SH |
3890 | |
3891 | netpoll_poll_unlock(have); | |
1da177e4 LT |
3892 | } |
3893 | out: | |
e326bed2 | 3894 | net_rps_action_and_irq_enable(sd); |
0a9627f2 | 3895 | |
db217334 CL |
3896 | #ifdef CONFIG_NET_DMA |
3897 | /* | |
3898 | * There may not be any more sk_buffs coming right now, so push | |
3899 | * any pending DMA copies to hardware | |
3900 | */ | |
2ba05622 | 3901 | dma_issue_pending_all(); |
db217334 | 3902 | #endif |
bea3348e | 3903 | |
1da177e4 LT |
3904 | return; |
3905 | ||
3906 | softnet_break: | |
dee42870 | 3907 | sd->time_squeeze++; |
1da177e4 LT |
3908 | __raise_softirq_irqoff(NET_RX_SOFTIRQ); |
3909 | goto out; | |
3910 | } | |
3911 | ||
d1b19dff | 3912 | static gifconf_func_t *gifconf_list[NPROTO]; |
1da177e4 LT |
3913 | |
3914 | /** | |
3915 | * register_gifconf - register a SIOCGIF handler | |
3916 | * @family: Address family | |
3917 | * @gifconf: Function handler | |
3918 | * | |
3919 | * Register protocol dependent address dumping routines. The handler | |
3920 | * that is passed must not be freed or reused until it has been replaced | |
3921 | * by another handler. | |
3922 | */ | |
d1b19dff | 3923 | int register_gifconf(unsigned int family, gifconf_func_t *gifconf) |
1da177e4 LT |
3924 | { |
3925 | if (family >= NPROTO) | |
3926 | return -EINVAL; | |
3927 | gifconf_list[family] = gifconf; | |
3928 | return 0; | |
3929 | } | |
d1b19dff | 3930 | EXPORT_SYMBOL(register_gifconf); |
1da177e4 LT |
3931 | |
3932 | ||
3933 | /* | |
3934 | * Map an interface index to its name (SIOCGIFNAME) | |
3935 | */ | |
3936 | ||
3937 | /* | |
3938 | * We need this ioctl for efficient implementation of the | |
3939 | * if_indextoname() function required by the IPv6 API. Without | |
3940 | * it, we would have to search all the interfaces to find a | |
3941 | * match. --pb | |
3942 | */ | |
3943 | ||
881d966b | 3944 | static int dev_ifname(struct net *net, struct ifreq __user *arg) |
1da177e4 LT |
3945 | { |
3946 | struct net_device *dev; | |
3947 | struct ifreq ifr; | |
3948 | ||
3949 | /* | |
3950 | * Fetch the caller's info block. | |
3951 | */ | |
3952 | ||
3953 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
3954 | return -EFAULT; | |
3955 | ||
fb699dfd ED |
3956 | rcu_read_lock(); |
3957 | dev = dev_get_by_index_rcu(net, ifr.ifr_ifindex); | |
1da177e4 | 3958 | if (!dev) { |
fb699dfd | 3959 | rcu_read_unlock(); |
1da177e4 LT |
3960 | return -ENODEV; |
3961 | } | |
3962 | ||
3963 | strcpy(ifr.ifr_name, dev->name); | |
fb699dfd | 3964 | rcu_read_unlock(); |
1da177e4 LT |
3965 | |
3966 | if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) | |
3967 | return -EFAULT; | |
3968 | return 0; | |
3969 | } | |
3970 | ||
3971 | /* | |
3972 | * Perform a SIOCGIFCONF call. This structure will change | |
3973 | * size eventually, and there is nothing I can do about it. | |
3974 | * Thus we will need a 'compatibility mode'. | |
3975 | */ | |
3976 | ||
881d966b | 3977 | static int dev_ifconf(struct net *net, char __user *arg) |
1da177e4 LT |
3978 | { |
3979 | struct ifconf ifc; | |
3980 | struct net_device *dev; | |
3981 | char __user *pos; | |
3982 | int len; | |
3983 | int total; | |
3984 | int i; | |
3985 | ||
3986 | /* | |
3987 | * Fetch the caller's info block. | |
3988 | */ | |
3989 | ||
3990 | if (copy_from_user(&ifc, arg, sizeof(struct ifconf))) | |
3991 | return -EFAULT; | |
3992 | ||
3993 | pos = ifc.ifc_buf; | |
3994 | len = ifc.ifc_len; | |
3995 | ||
3996 | /* | |
3997 | * Loop over the interfaces, and write an info block for each. | |
3998 | */ | |
3999 | ||
4000 | total = 0; | |
881d966b | 4001 | for_each_netdev(net, dev) { |
1da177e4 LT |
4002 | for (i = 0; i < NPROTO; i++) { |
4003 | if (gifconf_list[i]) { | |
4004 | int done; | |
4005 | if (!pos) | |
4006 | done = gifconf_list[i](dev, NULL, 0); | |
4007 | else | |
4008 | done = gifconf_list[i](dev, pos + total, | |
4009 | len - total); | |
4010 | if (done < 0) | |
4011 | return -EFAULT; | |
4012 | total += done; | |
4013 | } | |
4014 | } | |
4ec93edb | 4015 | } |
1da177e4 LT |
4016 | |
4017 | /* | |
4018 | * All done. Write the updated control block back to the caller. | |
4019 | */ | |
4020 | ifc.ifc_len = total; | |
4021 | ||
4022 | /* | |
4023 | * Both BSD and Solaris return 0 here, so we do too. | |
4024 | */ | |
4025 | return copy_to_user(arg, &ifc, sizeof(struct ifconf)) ? -EFAULT : 0; | |
4026 | } | |
4027 | ||
4028 | #ifdef CONFIG_PROC_FS | |
4029 | /* | |
4030 | * This is invoked by the /proc filesystem handler to display a device | |
4031 | * in detail. | |
4032 | */ | |
7562f876 | 4033 | void *dev_seq_start(struct seq_file *seq, loff_t *pos) |
c6d14c84 | 4034 | __acquires(RCU) |
1da177e4 | 4035 | { |
e372c414 | 4036 | struct net *net = seq_file_net(seq); |
7562f876 | 4037 | loff_t off; |
1da177e4 | 4038 | struct net_device *dev; |
1da177e4 | 4039 | |
c6d14c84 | 4040 | rcu_read_lock(); |
7562f876 PE |
4041 | if (!*pos) |
4042 | return SEQ_START_TOKEN; | |
1da177e4 | 4043 | |
7562f876 | 4044 | off = 1; |
c6d14c84 | 4045 | for_each_netdev_rcu(net, dev) |
7562f876 PE |
4046 | if (off++ == *pos) |
4047 | return dev; | |
1da177e4 | 4048 | |
7562f876 | 4049 | return NULL; |
1da177e4 LT |
4050 | } |
4051 | ||
4052 | void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
4053 | { | |
c6d14c84 ED |
4054 | struct net_device *dev = (v == SEQ_START_TOKEN) ? |
4055 | first_net_device(seq_file_net(seq)) : | |
4056 | next_net_device((struct net_device *)v); | |
4057 | ||
1da177e4 | 4058 | ++*pos; |
c6d14c84 | 4059 | return rcu_dereference(dev); |
1da177e4 LT |
4060 | } |
4061 | ||
4062 | void dev_seq_stop(struct seq_file *seq, void *v) | |
c6d14c84 | 4063 | __releases(RCU) |
1da177e4 | 4064 | { |
c6d14c84 | 4065 | rcu_read_unlock(); |
1da177e4 LT |
4066 | } |
4067 | ||
4068 | static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) | |
4069 | { | |
28172739 ED |
4070 | struct rtnl_link_stats64 temp; |
4071 | const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); | |
1da177e4 | 4072 | |
be1f3c2c BH |
4073 | seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu " |
4074 | "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n", | |
5a1b5898 RR |
4075 | dev->name, stats->rx_bytes, stats->rx_packets, |
4076 | stats->rx_errors, | |
4077 | stats->rx_dropped + stats->rx_missed_errors, | |
4078 | stats->rx_fifo_errors, | |
4079 | stats->rx_length_errors + stats->rx_over_errors + | |
4080 | stats->rx_crc_errors + stats->rx_frame_errors, | |
4081 | stats->rx_compressed, stats->multicast, | |
4082 | stats->tx_bytes, stats->tx_packets, | |
4083 | stats->tx_errors, stats->tx_dropped, | |
4084 | stats->tx_fifo_errors, stats->collisions, | |
4085 | stats->tx_carrier_errors + | |
4086 | stats->tx_aborted_errors + | |
4087 | stats->tx_window_errors + | |
4088 | stats->tx_heartbeat_errors, | |
4089 | stats->tx_compressed); | |
1da177e4 LT |
4090 | } |
4091 | ||
4092 | /* | |
4093 | * Called from the PROCfs module. This now uses the new arbitrary sized | |
4094 | * /proc/net interface to create /proc/net/dev | |
4095 | */ | |
4096 | static int dev_seq_show(struct seq_file *seq, void *v) | |
4097 | { | |
4098 | if (v == SEQ_START_TOKEN) | |
4099 | seq_puts(seq, "Inter-| Receive " | |
4100 | " | Transmit\n" | |
4101 | " face |bytes packets errs drop fifo frame " | |
4102 | "compressed multicast|bytes packets errs " | |
4103 | "drop fifo colls carrier compressed\n"); | |
4104 | else | |
4105 | dev_seq_printf_stats(seq, v); | |
4106 | return 0; | |
4107 | } | |
4108 | ||
dee42870 | 4109 | static struct softnet_data *softnet_get_online(loff_t *pos) |
1da177e4 | 4110 | { |
dee42870 | 4111 | struct softnet_data *sd = NULL; |
1da177e4 | 4112 | |
0c0b0aca | 4113 | while (*pos < nr_cpu_ids) |
4ec93edb | 4114 | if (cpu_online(*pos)) { |
dee42870 | 4115 | sd = &per_cpu(softnet_data, *pos); |
1da177e4 LT |
4116 | break; |
4117 | } else | |
4118 | ++*pos; | |
dee42870 | 4119 | return sd; |
1da177e4 LT |
4120 | } |
4121 | ||
4122 | static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) | |
4123 | { | |
4124 | return softnet_get_online(pos); | |
4125 | } | |
4126 | ||
4127 | static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
4128 | { | |
4129 | ++*pos; | |
4130 | return softnet_get_online(pos); | |
4131 | } | |
4132 | ||
4133 | static void softnet_seq_stop(struct seq_file *seq, void *v) | |
4134 | { | |
4135 | } | |
4136 | ||
4137 | static int softnet_seq_show(struct seq_file *seq, void *v) | |
4138 | { | |
dee42870 | 4139 | struct softnet_data *sd = v; |
1da177e4 | 4140 | |
0a9627f2 | 4141 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n", |
dee42870 | 4142 | sd->processed, sd->dropped, sd->time_squeeze, 0, |
c1ebcdb8 | 4143 | 0, 0, 0, 0, /* was fastroute */ |
dee42870 | 4144 | sd->cpu_collision, sd->received_rps); |
1da177e4 LT |
4145 | return 0; |
4146 | } | |
4147 | ||
f690808e | 4148 | static const struct seq_operations dev_seq_ops = { |
1da177e4 LT |
4149 | .start = dev_seq_start, |
4150 | .next = dev_seq_next, | |
4151 | .stop = dev_seq_stop, | |
4152 | .show = dev_seq_show, | |
4153 | }; | |
4154 | ||
4155 | static int dev_seq_open(struct inode *inode, struct file *file) | |
4156 | { | |
e372c414 DL |
4157 | return seq_open_net(inode, file, &dev_seq_ops, |
4158 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
4159 | } |
4160 | ||
9a32144e | 4161 | static const struct file_operations dev_seq_fops = { |
1da177e4 LT |
4162 | .owner = THIS_MODULE, |
4163 | .open = dev_seq_open, | |
4164 | .read = seq_read, | |
4165 | .llseek = seq_lseek, | |
e372c414 | 4166 | .release = seq_release_net, |
1da177e4 LT |
4167 | }; |
4168 | ||
f690808e | 4169 | static const struct seq_operations softnet_seq_ops = { |
1da177e4 LT |
4170 | .start = softnet_seq_start, |
4171 | .next = softnet_seq_next, | |
4172 | .stop = softnet_seq_stop, | |
4173 | .show = softnet_seq_show, | |
4174 | }; | |
4175 | ||
4176 | static int softnet_seq_open(struct inode *inode, struct file *file) | |
4177 | { | |
4178 | return seq_open(file, &softnet_seq_ops); | |
4179 | } | |
4180 | ||
9a32144e | 4181 | static const struct file_operations softnet_seq_fops = { |
1da177e4 LT |
4182 | .owner = THIS_MODULE, |
4183 | .open = softnet_seq_open, | |
4184 | .read = seq_read, | |
4185 | .llseek = seq_lseek, | |
4186 | .release = seq_release, | |
4187 | }; | |
4188 | ||
0e1256ff SH |
4189 | static void *ptype_get_idx(loff_t pos) |
4190 | { | |
4191 | struct packet_type *pt = NULL; | |
4192 | loff_t i = 0; | |
4193 | int t; | |
4194 | ||
4195 | list_for_each_entry_rcu(pt, &ptype_all, list) { | |
4196 | if (i == pos) | |
4197 | return pt; | |
4198 | ++i; | |
4199 | } | |
4200 | ||
82d8a867 | 4201 | for (t = 0; t < PTYPE_HASH_SIZE; t++) { |
0e1256ff SH |
4202 | list_for_each_entry_rcu(pt, &ptype_base[t], list) { |
4203 | if (i == pos) | |
4204 | return pt; | |
4205 | ++i; | |
4206 | } | |
4207 | } | |
4208 | return NULL; | |
4209 | } | |
4210 | ||
4211 | static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) | |
72348a42 | 4212 | __acquires(RCU) |
0e1256ff SH |
4213 | { |
4214 | rcu_read_lock(); | |
4215 | return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN; | |
4216 | } | |
4217 | ||
4218 | static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
4219 | { | |
4220 | struct packet_type *pt; | |
4221 | struct list_head *nxt; | |
4222 | int hash; | |
4223 | ||
4224 | ++*pos; | |
4225 | if (v == SEQ_START_TOKEN) | |
4226 | return ptype_get_idx(0); | |
4227 | ||
4228 | pt = v; | |
4229 | nxt = pt->list.next; | |
4230 | if (pt->type == htons(ETH_P_ALL)) { | |
4231 | if (nxt != &ptype_all) | |
4232 | goto found; | |
4233 | hash = 0; | |
4234 | nxt = ptype_base[0].next; | |
4235 | } else | |
82d8a867 | 4236 | hash = ntohs(pt->type) & PTYPE_HASH_MASK; |
0e1256ff SH |
4237 | |
4238 | while (nxt == &ptype_base[hash]) { | |
82d8a867 | 4239 | if (++hash >= PTYPE_HASH_SIZE) |
0e1256ff SH |
4240 | return NULL; |
4241 | nxt = ptype_base[hash].next; | |
4242 | } | |
4243 | found: | |
4244 | return list_entry(nxt, struct packet_type, list); | |
4245 | } | |
4246 | ||
4247 | static void ptype_seq_stop(struct seq_file *seq, void *v) | |
72348a42 | 4248 | __releases(RCU) |
0e1256ff SH |
4249 | { |
4250 | rcu_read_unlock(); | |
4251 | } | |
4252 | ||
0e1256ff SH |
4253 | static int ptype_seq_show(struct seq_file *seq, void *v) |
4254 | { | |
4255 | struct packet_type *pt = v; | |
4256 | ||
4257 | if (v == SEQ_START_TOKEN) | |
4258 | seq_puts(seq, "Type Device Function\n"); | |
c346dca1 | 4259 | else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) { |
0e1256ff SH |
4260 | if (pt->type == htons(ETH_P_ALL)) |
4261 | seq_puts(seq, "ALL "); | |
4262 | else | |
4263 | seq_printf(seq, "%04x", ntohs(pt->type)); | |
4264 | ||
908cd2da AD |
4265 | seq_printf(seq, " %-8s %pF\n", |
4266 | pt->dev ? pt->dev->name : "", pt->func); | |
0e1256ff SH |
4267 | } |
4268 | ||
4269 | return 0; | |
4270 | } | |
4271 | ||
4272 | static const struct seq_operations ptype_seq_ops = { | |
4273 | .start = ptype_seq_start, | |
4274 | .next = ptype_seq_next, | |
4275 | .stop = ptype_seq_stop, | |
4276 | .show = ptype_seq_show, | |
4277 | }; | |
4278 | ||
4279 | static int ptype_seq_open(struct inode *inode, struct file *file) | |
4280 | { | |
2feb27db PE |
4281 | return seq_open_net(inode, file, &ptype_seq_ops, |
4282 | sizeof(struct seq_net_private)); | |
0e1256ff SH |
4283 | } |
4284 | ||
4285 | static const struct file_operations ptype_seq_fops = { | |
4286 | .owner = THIS_MODULE, | |
4287 | .open = ptype_seq_open, | |
4288 | .read = seq_read, | |
4289 | .llseek = seq_lseek, | |
2feb27db | 4290 | .release = seq_release_net, |
0e1256ff SH |
4291 | }; |
4292 | ||
4293 | ||
4665079c | 4294 | static int __net_init dev_proc_net_init(struct net *net) |
1da177e4 LT |
4295 | { |
4296 | int rc = -ENOMEM; | |
4297 | ||
881d966b | 4298 | if (!proc_net_fops_create(net, "dev", S_IRUGO, &dev_seq_fops)) |
1da177e4 | 4299 | goto out; |
881d966b | 4300 | if (!proc_net_fops_create(net, "softnet_stat", S_IRUGO, &softnet_seq_fops)) |
1da177e4 | 4301 | goto out_dev; |
881d966b | 4302 | if (!proc_net_fops_create(net, "ptype", S_IRUGO, &ptype_seq_fops)) |
457c4cbc | 4303 | goto out_softnet; |
0e1256ff | 4304 | |
881d966b | 4305 | if (wext_proc_init(net)) |
457c4cbc | 4306 | goto out_ptype; |
1da177e4 LT |
4307 | rc = 0; |
4308 | out: | |
4309 | return rc; | |
457c4cbc | 4310 | out_ptype: |
881d966b | 4311 | proc_net_remove(net, "ptype"); |
1da177e4 | 4312 | out_softnet: |
881d966b | 4313 | proc_net_remove(net, "softnet_stat"); |
1da177e4 | 4314 | out_dev: |
881d966b | 4315 | proc_net_remove(net, "dev"); |
1da177e4 LT |
4316 | goto out; |
4317 | } | |
881d966b | 4318 | |
4665079c | 4319 | static void __net_exit dev_proc_net_exit(struct net *net) |
881d966b EB |
4320 | { |
4321 | wext_proc_exit(net); | |
4322 | ||
4323 | proc_net_remove(net, "ptype"); | |
4324 | proc_net_remove(net, "softnet_stat"); | |
4325 | proc_net_remove(net, "dev"); | |
4326 | } | |
4327 | ||
022cbae6 | 4328 | static struct pernet_operations __net_initdata dev_proc_ops = { |
881d966b EB |
4329 | .init = dev_proc_net_init, |
4330 | .exit = dev_proc_net_exit, | |
4331 | }; | |
4332 | ||
4333 | static int __init dev_proc_init(void) | |
4334 | { | |
4335 | return register_pernet_subsys(&dev_proc_ops); | |
4336 | } | |
1da177e4 LT |
4337 | #else |
4338 | #define dev_proc_init() 0 | |
4339 | #endif /* CONFIG_PROC_FS */ | |
4340 | ||
4341 | ||
4342 | /** | |
4343 | * netdev_set_master - set up master/slave pair | |
4344 | * @slave: slave device | |
4345 | * @master: new master device | |
4346 | * | |
4347 | * Changes the master device of the slave. Pass %NULL to break the | |
4348 | * bonding. The caller must hold the RTNL semaphore. On a failure | |
4349 | * a negative errno code is returned. On success the reference counts | |
4350 | * are adjusted, %RTM_NEWLINK is sent to the routing socket and the | |
4351 | * function returns zero. | |
4352 | */ | |
4353 | int netdev_set_master(struct net_device *slave, struct net_device *master) | |
4354 | { | |
4355 | struct net_device *old = slave->master; | |
4356 | ||
4357 | ASSERT_RTNL(); | |
4358 | ||
4359 | if (master) { | |
4360 | if (old) | |
4361 | return -EBUSY; | |
4362 | dev_hold(master); | |
4363 | } | |
4364 | ||
4365 | slave->master = master; | |
4ec93edb | 4366 | |
283f2fe8 ED |
4367 | if (old) { |
4368 | synchronize_net(); | |
1da177e4 | 4369 | dev_put(old); |
283f2fe8 | 4370 | } |
1da177e4 LT |
4371 | if (master) |
4372 | slave->flags |= IFF_SLAVE; | |
4373 | else | |
4374 | slave->flags &= ~IFF_SLAVE; | |
4375 | ||
4376 | rtmsg_ifinfo(RTM_NEWLINK, slave, IFF_SLAVE); | |
4377 | return 0; | |
4378 | } | |
d1b19dff | 4379 | EXPORT_SYMBOL(netdev_set_master); |
1da177e4 | 4380 | |
b6c40d68 PM |
4381 | static void dev_change_rx_flags(struct net_device *dev, int flags) |
4382 | { | |
d314774c SH |
4383 | const struct net_device_ops *ops = dev->netdev_ops; |
4384 | ||
4385 | if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags) | |
4386 | ops->ndo_change_rx_flags(dev, flags); | |
b6c40d68 PM |
4387 | } |
4388 | ||
dad9b335 | 4389 | static int __dev_set_promiscuity(struct net_device *dev, int inc) |
1da177e4 LT |
4390 | { |
4391 | unsigned short old_flags = dev->flags; | |
8192b0c4 DH |
4392 | uid_t uid; |
4393 | gid_t gid; | |
1da177e4 | 4394 | |
24023451 PM |
4395 | ASSERT_RTNL(); |
4396 | ||
dad9b335 WC |
4397 | dev->flags |= IFF_PROMISC; |
4398 | dev->promiscuity += inc; | |
4399 | if (dev->promiscuity == 0) { | |
4400 | /* | |
4401 | * Avoid overflow. | |
4402 | * If inc causes overflow, untouch promisc and return error. | |
4403 | */ | |
4404 | if (inc < 0) | |
4405 | dev->flags &= ~IFF_PROMISC; | |
4406 | else { | |
4407 | dev->promiscuity -= inc; | |
4408 | printk(KERN_WARNING "%s: promiscuity touches roof, " | |
4409 | "set promiscuity failed, promiscuity feature " | |
4410 | "of device might be broken.\n", dev->name); | |
4411 | return -EOVERFLOW; | |
4412 | } | |
4413 | } | |
52609c0b | 4414 | if (dev->flags != old_flags) { |
1da177e4 LT |
4415 | printk(KERN_INFO "device %s %s promiscuous mode\n", |
4416 | dev->name, (dev->flags & IFF_PROMISC) ? "entered" : | |
4ec93edb | 4417 | "left"); |
8192b0c4 DH |
4418 | if (audit_enabled) { |
4419 | current_uid_gid(&uid, &gid); | |
7759db82 KHK |
4420 | audit_log(current->audit_context, GFP_ATOMIC, |
4421 | AUDIT_ANOM_PROMISCUOUS, | |
4422 | "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u", | |
4423 | dev->name, (dev->flags & IFF_PROMISC), | |
4424 | (old_flags & IFF_PROMISC), | |
4425 | audit_get_loginuid(current), | |
8192b0c4 | 4426 | uid, gid, |
7759db82 | 4427 | audit_get_sessionid(current)); |
8192b0c4 | 4428 | } |
24023451 | 4429 | |
b6c40d68 | 4430 | dev_change_rx_flags(dev, IFF_PROMISC); |
1da177e4 | 4431 | } |
dad9b335 | 4432 | return 0; |
1da177e4 LT |
4433 | } |
4434 | ||
4417da66 PM |
4435 | /** |
4436 | * dev_set_promiscuity - update promiscuity count on a device | |
4437 | * @dev: device | |
4438 | * @inc: modifier | |
4439 | * | |
4440 | * Add or remove promiscuity from a device. While the count in the device | |
4441 | * remains above zero the interface remains promiscuous. Once it hits zero | |
4442 | * the device reverts back to normal filtering operation. A negative inc | |
4443 | * value is used to drop promiscuity on the device. | |
dad9b335 | 4444 | * Return 0 if successful or a negative errno code on error. |
4417da66 | 4445 | */ |
dad9b335 | 4446 | int dev_set_promiscuity(struct net_device *dev, int inc) |
4417da66 PM |
4447 | { |
4448 | unsigned short old_flags = dev->flags; | |
dad9b335 | 4449 | int err; |
4417da66 | 4450 | |
dad9b335 | 4451 | err = __dev_set_promiscuity(dev, inc); |
4b5a698e | 4452 | if (err < 0) |
dad9b335 | 4453 | return err; |
4417da66 PM |
4454 | if (dev->flags != old_flags) |
4455 | dev_set_rx_mode(dev); | |
dad9b335 | 4456 | return err; |
4417da66 | 4457 | } |
d1b19dff | 4458 | EXPORT_SYMBOL(dev_set_promiscuity); |
4417da66 | 4459 | |
1da177e4 LT |
4460 | /** |
4461 | * dev_set_allmulti - update allmulti count on a device | |
4462 | * @dev: device | |
4463 | * @inc: modifier | |
4464 | * | |
4465 | * Add or remove reception of all multicast frames to a device. While the | |
4466 | * count in the device remains above zero the interface remains listening | |
4467 | * to all interfaces. Once it hits zero the device reverts back to normal | |
4468 | * filtering operation. A negative @inc value is used to drop the counter | |
4469 | * when releasing a resource needing all multicasts. | |
dad9b335 | 4470 | * Return 0 if successful or a negative errno code on error. |
1da177e4 LT |
4471 | */ |
4472 | ||
dad9b335 | 4473 | int dev_set_allmulti(struct net_device *dev, int inc) |
1da177e4 LT |
4474 | { |
4475 | unsigned short old_flags = dev->flags; | |
4476 | ||
24023451 PM |
4477 | ASSERT_RTNL(); |
4478 | ||
1da177e4 | 4479 | dev->flags |= IFF_ALLMULTI; |
dad9b335 WC |
4480 | dev->allmulti += inc; |
4481 | if (dev->allmulti == 0) { | |
4482 | /* | |
4483 | * Avoid overflow. | |
4484 | * If inc causes overflow, untouch allmulti and return error. | |
4485 | */ | |
4486 | if (inc < 0) | |
4487 | dev->flags &= ~IFF_ALLMULTI; | |
4488 | else { | |
4489 | dev->allmulti -= inc; | |
4490 | printk(KERN_WARNING "%s: allmulti touches roof, " | |
4491 | "set allmulti failed, allmulti feature of " | |
4492 | "device might be broken.\n", dev->name); | |
4493 | return -EOVERFLOW; | |
4494 | } | |
4495 | } | |
24023451 | 4496 | if (dev->flags ^ old_flags) { |
b6c40d68 | 4497 | dev_change_rx_flags(dev, IFF_ALLMULTI); |
4417da66 | 4498 | dev_set_rx_mode(dev); |
24023451 | 4499 | } |
dad9b335 | 4500 | return 0; |
4417da66 | 4501 | } |
d1b19dff | 4502 | EXPORT_SYMBOL(dev_set_allmulti); |
4417da66 PM |
4503 | |
4504 | /* | |
4505 | * Upload unicast and multicast address lists to device and | |
4506 | * configure RX filtering. When the device doesn't support unicast | |
53ccaae1 | 4507 | * filtering it is put in promiscuous mode while unicast addresses |
4417da66 PM |
4508 | * are present. |
4509 | */ | |
4510 | void __dev_set_rx_mode(struct net_device *dev) | |
4511 | { | |
d314774c SH |
4512 | const struct net_device_ops *ops = dev->netdev_ops; |
4513 | ||
4417da66 PM |
4514 | /* dev_open will call this function so the list will stay sane. */ |
4515 | if (!(dev->flags&IFF_UP)) | |
4516 | return; | |
4517 | ||
4518 | if (!netif_device_present(dev)) | |
40b77c94 | 4519 | return; |
4417da66 | 4520 | |
d314774c SH |
4521 | if (ops->ndo_set_rx_mode) |
4522 | ops->ndo_set_rx_mode(dev); | |
4417da66 PM |
4523 | else { |
4524 | /* Unicast addresses changes may only happen under the rtnl, | |
4525 | * therefore calling __dev_set_promiscuity here is safe. | |
4526 | */ | |
32e7bfc4 | 4527 | if (!netdev_uc_empty(dev) && !dev->uc_promisc) { |
4417da66 PM |
4528 | __dev_set_promiscuity(dev, 1); |
4529 | dev->uc_promisc = 1; | |
32e7bfc4 | 4530 | } else if (netdev_uc_empty(dev) && dev->uc_promisc) { |
4417da66 PM |
4531 | __dev_set_promiscuity(dev, -1); |
4532 | dev->uc_promisc = 0; | |
4533 | } | |
4534 | ||
d314774c SH |
4535 | if (ops->ndo_set_multicast_list) |
4536 | ops->ndo_set_multicast_list(dev); | |
4417da66 PM |
4537 | } |
4538 | } | |
4539 | ||
4540 | void dev_set_rx_mode(struct net_device *dev) | |
4541 | { | |
b9e40857 | 4542 | netif_addr_lock_bh(dev); |
4417da66 | 4543 | __dev_set_rx_mode(dev); |
b9e40857 | 4544 | netif_addr_unlock_bh(dev); |
1da177e4 LT |
4545 | } |
4546 | ||
f0db275a SH |
4547 | /** |
4548 | * dev_get_flags - get flags reported to userspace | |
4549 | * @dev: device | |
4550 | * | |
4551 | * Get the combination of flag bits exported through APIs to userspace. | |
4552 | */ | |
1da177e4 LT |
4553 | unsigned dev_get_flags(const struct net_device *dev) |
4554 | { | |
4555 | unsigned flags; | |
4556 | ||
4557 | flags = (dev->flags & ~(IFF_PROMISC | | |
4558 | IFF_ALLMULTI | | |
b00055aa SR |
4559 | IFF_RUNNING | |
4560 | IFF_LOWER_UP | | |
4561 | IFF_DORMANT)) | | |
1da177e4 LT |
4562 | (dev->gflags & (IFF_PROMISC | |
4563 | IFF_ALLMULTI)); | |
4564 | ||
b00055aa SR |
4565 | if (netif_running(dev)) { |
4566 | if (netif_oper_up(dev)) | |
4567 | flags |= IFF_RUNNING; | |
4568 | if (netif_carrier_ok(dev)) | |
4569 | flags |= IFF_LOWER_UP; | |
4570 | if (netif_dormant(dev)) | |
4571 | flags |= IFF_DORMANT; | |
4572 | } | |
1da177e4 LT |
4573 | |
4574 | return flags; | |
4575 | } | |
d1b19dff | 4576 | EXPORT_SYMBOL(dev_get_flags); |
1da177e4 | 4577 | |
bd380811 | 4578 | int __dev_change_flags(struct net_device *dev, unsigned int flags) |
1da177e4 | 4579 | { |
1da177e4 | 4580 | int old_flags = dev->flags; |
bd380811 | 4581 | int ret; |
1da177e4 | 4582 | |
24023451 PM |
4583 | ASSERT_RTNL(); |
4584 | ||
1da177e4 LT |
4585 | /* |
4586 | * Set the flags on our device. | |
4587 | */ | |
4588 | ||
4589 | dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP | | |
4590 | IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL | | |
4591 | IFF_AUTOMEDIA)) | | |
4592 | (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC | | |
4593 | IFF_ALLMULTI)); | |
4594 | ||
4595 | /* | |
4596 | * Load in the correct multicast list now the flags have changed. | |
4597 | */ | |
4598 | ||
b6c40d68 PM |
4599 | if ((old_flags ^ flags) & IFF_MULTICAST) |
4600 | dev_change_rx_flags(dev, IFF_MULTICAST); | |
24023451 | 4601 | |
4417da66 | 4602 | dev_set_rx_mode(dev); |
1da177e4 LT |
4603 | |
4604 | /* | |
4605 | * Have we downed the interface. We handle IFF_UP ourselves | |
4606 | * according to user attempts to set it, rather than blindly | |
4607 | * setting it. | |
4608 | */ | |
4609 | ||
4610 | ret = 0; | |
4611 | if ((old_flags ^ flags) & IFF_UP) { /* Bit is different ? */ | |
bd380811 | 4612 | ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev); |
1da177e4 LT |
4613 | |
4614 | if (!ret) | |
4417da66 | 4615 | dev_set_rx_mode(dev); |
1da177e4 LT |
4616 | } |
4617 | ||
1da177e4 | 4618 | if ((flags ^ dev->gflags) & IFF_PROMISC) { |
d1b19dff ED |
4619 | int inc = (flags & IFF_PROMISC) ? 1 : -1; |
4620 | ||
1da177e4 LT |
4621 | dev->gflags ^= IFF_PROMISC; |
4622 | dev_set_promiscuity(dev, inc); | |
4623 | } | |
4624 | ||
4625 | /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI | |
4626 | is important. Some (broken) drivers set IFF_PROMISC, when | |
4627 | IFF_ALLMULTI is requested not asking us and not reporting. | |
4628 | */ | |
4629 | if ((flags ^ dev->gflags) & IFF_ALLMULTI) { | |
d1b19dff ED |
4630 | int inc = (flags & IFF_ALLMULTI) ? 1 : -1; |
4631 | ||
1da177e4 LT |
4632 | dev->gflags ^= IFF_ALLMULTI; |
4633 | dev_set_allmulti(dev, inc); | |
4634 | } | |
4635 | ||
bd380811 PM |
4636 | return ret; |
4637 | } | |
4638 | ||
4639 | void __dev_notify_flags(struct net_device *dev, unsigned int old_flags) | |
4640 | { | |
4641 | unsigned int changes = dev->flags ^ old_flags; | |
4642 | ||
4643 | if (changes & IFF_UP) { | |
4644 | if (dev->flags & IFF_UP) | |
4645 | call_netdevice_notifiers(NETDEV_UP, dev); | |
4646 | else | |
4647 | call_netdevice_notifiers(NETDEV_DOWN, dev); | |
4648 | } | |
4649 | ||
4650 | if (dev->flags & IFF_UP && | |
4651 | (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) | |
4652 | call_netdevice_notifiers(NETDEV_CHANGE, dev); | |
4653 | } | |
4654 | ||
4655 | /** | |
4656 | * dev_change_flags - change device settings | |
4657 | * @dev: device | |
4658 | * @flags: device state flags | |
4659 | * | |
4660 | * Change settings on device based state flags. The flags are | |
4661 | * in the userspace exported format. | |
4662 | */ | |
4663 | int dev_change_flags(struct net_device *dev, unsigned flags) | |
4664 | { | |
4665 | int ret, changes; | |
4666 | int old_flags = dev->flags; | |
4667 | ||
4668 | ret = __dev_change_flags(dev, flags); | |
4669 | if (ret < 0) | |
4670 | return ret; | |
4671 | ||
4672 | changes = old_flags ^ dev->flags; | |
7c355f53 TG |
4673 | if (changes) |
4674 | rtmsg_ifinfo(RTM_NEWLINK, dev, changes); | |
1da177e4 | 4675 | |
bd380811 | 4676 | __dev_notify_flags(dev, old_flags); |
1da177e4 LT |
4677 | return ret; |
4678 | } | |
d1b19dff | 4679 | EXPORT_SYMBOL(dev_change_flags); |
1da177e4 | 4680 | |
f0db275a SH |
4681 | /** |
4682 | * dev_set_mtu - Change maximum transfer unit | |
4683 | * @dev: device | |
4684 | * @new_mtu: new transfer unit | |
4685 | * | |
4686 | * Change the maximum transfer size of the network device. | |
4687 | */ | |
1da177e4 LT |
4688 | int dev_set_mtu(struct net_device *dev, int new_mtu) |
4689 | { | |
d314774c | 4690 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
4691 | int err; |
4692 | ||
4693 | if (new_mtu == dev->mtu) | |
4694 | return 0; | |
4695 | ||
4696 | /* MTU must be positive. */ | |
4697 | if (new_mtu < 0) | |
4698 | return -EINVAL; | |
4699 | ||
4700 | if (!netif_device_present(dev)) | |
4701 | return -ENODEV; | |
4702 | ||
4703 | err = 0; | |
d314774c SH |
4704 | if (ops->ndo_change_mtu) |
4705 | err = ops->ndo_change_mtu(dev, new_mtu); | |
1da177e4 LT |
4706 | else |
4707 | dev->mtu = new_mtu; | |
d314774c | 4708 | |
1da177e4 | 4709 | if (!err && dev->flags & IFF_UP) |
056925ab | 4710 | call_netdevice_notifiers(NETDEV_CHANGEMTU, dev); |
1da177e4 LT |
4711 | return err; |
4712 | } | |
d1b19dff | 4713 | EXPORT_SYMBOL(dev_set_mtu); |
1da177e4 | 4714 | |
cbda10fa VD |
4715 | /** |
4716 | * dev_set_group - Change group this device belongs to | |
4717 | * @dev: device | |
4718 | * @new_group: group this device should belong to | |
4719 | */ | |
4720 | void dev_set_group(struct net_device *dev, int new_group) | |
4721 | { | |
4722 | dev->group = new_group; | |
4723 | } | |
4724 | EXPORT_SYMBOL(dev_set_group); | |
4725 | ||
f0db275a SH |
4726 | /** |
4727 | * dev_set_mac_address - Change Media Access Control Address | |
4728 | * @dev: device | |
4729 | * @sa: new address | |
4730 | * | |
4731 | * Change the hardware (MAC) address of the device | |
4732 | */ | |
1da177e4 LT |
4733 | int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa) |
4734 | { | |
d314774c | 4735 | const struct net_device_ops *ops = dev->netdev_ops; |
1da177e4 LT |
4736 | int err; |
4737 | ||
d314774c | 4738 | if (!ops->ndo_set_mac_address) |
1da177e4 LT |
4739 | return -EOPNOTSUPP; |
4740 | if (sa->sa_family != dev->type) | |
4741 | return -EINVAL; | |
4742 | if (!netif_device_present(dev)) | |
4743 | return -ENODEV; | |
d314774c | 4744 | err = ops->ndo_set_mac_address(dev, sa); |
1da177e4 | 4745 | if (!err) |
056925ab | 4746 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); |
1da177e4 LT |
4747 | return err; |
4748 | } | |
d1b19dff | 4749 | EXPORT_SYMBOL(dev_set_mac_address); |
1da177e4 LT |
4750 | |
4751 | /* | |
3710becf | 4752 | * Perform the SIOCxIFxxx calls, inside rcu_read_lock() |
1da177e4 | 4753 | */ |
14e3e079 | 4754 | static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd) |
1da177e4 LT |
4755 | { |
4756 | int err; | |
3710becf | 4757 | struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name); |
1da177e4 LT |
4758 | |
4759 | if (!dev) | |
4760 | return -ENODEV; | |
4761 | ||
4762 | switch (cmd) { | |
d1b19dff ED |
4763 | case SIOCGIFFLAGS: /* Get interface flags */ |
4764 | ifr->ifr_flags = (short) dev_get_flags(dev); | |
4765 | return 0; | |
1da177e4 | 4766 | |
d1b19dff ED |
4767 | case SIOCGIFMETRIC: /* Get the metric on the interface |
4768 | (currently unused) */ | |
4769 | ifr->ifr_metric = 0; | |
4770 | return 0; | |
1da177e4 | 4771 | |
d1b19dff ED |
4772 | case SIOCGIFMTU: /* Get the MTU of a device */ |
4773 | ifr->ifr_mtu = dev->mtu; | |
4774 | return 0; | |
1da177e4 | 4775 | |
d1b19dff ED |
4776 | case SIOCGIFHWADDR: |
4777 | if (!dev->addr_len) | |
4778 | memset(ifr->ifr_hwaddr.sa_data, 0, sizeof ifr->ifr_hwaddr.sa_data); | |
4779 | else | |
4780 | memcpy(ifr->ifr_hwaddr.sa_data, dev->dev_addr, | |
4781 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); | |
4782 | ifr->ifr_hwaddr.sa_family = dev->type; | |
4783 | return 0; | |
1da177e4 | 4784 | |
d1b19dff ED |
4785 | case SIOCGIFSLAVE: |
4786 | err = -EINVAL; | |
4787 | break; | |
14e3e079 | 4788 | |
d1b19dff ED |
4789 | case SIOCGIFMAP: |
4790 | ifr->ifr_map.mem_start = dev->mem_start; | |
4791 | ifr->ifr_map.mem_end = dev->mem_end; | |
4792 | ifr->ifr_map.base_addr = dev->base_addr; | |
4793 | ifr->ifr_map.irq = dev->irq; | |
4794 | ifr->ifr_map.dma = dev->dma; | |
4795 | ifr->ifr_map.port = dev->if_port; | |
4796 | return 0; | |
14e3e079 | 4797 | |
d1b19dff ED |
4798 | case SIOCGIFINDEX: |
4799 | ifr->ifr_ifindex = dev->ifindex; | |
4800 | return 0; | |
14e3e079 | 4801 | |
d1b19dff ED |
4802 | case SIOCGIFTXQLEN: |
4803 | ifr->ifr_qlen = dev->tx_queue_len; | |
4804 | return 0; | |
14e3e079 | 4805 | |
d1b19dff ED |
4806 | default: |
4807 | /* dev_ioctl() should ensure this case | |
4808 | * is never reached | |
4809 | */ | |
4810 | WARN_ON(1); | |
4811 | err = -EINVAL; | |
4812 | break; | |
14e3e079 JG |
4813 | |
4814 | } | |
4815 | return err; | |
4816 | } | |
4817 | ||
4818 | /* | |
4819 | * Perform the SIOCxIFxxx calls, inside rtnl_lock() | |
4820 | */ | |
4821 | static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd) | |
4822 | { | |
4823 | int err; | |
4824 | struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name); | |
5f2f6da7 | 4825 | const struct net_device_ops *ops; |
14e3e079 JG |
4826 | |
4827 | if (!dev) | |
4828 | return -ENODEV; | |
4829 | ||
5f2f6da7 JP |
4830 | ops = dev->netdev_ops; |
4831 | ||
14e3e079 | 4832 | switch (cmd) { |
d1b19dff ED |
4833 | case SIOCSIFFLAGS: /* Set interface flags */ |
4834 | return dev_change_flags(dev, ifr->ifr_flags); | |
14e3e079 | 4835 | |
d1b19dff ED |
4836 | case SIOCSIFMETRIC: /* Set the metric on the interface |
4837 | (currently unused) */ | |
4838 | return -EOPNOTSUPP; | |
14e3e079 | 4839 | |
d1b19dff ED |
4840 | case SIOCSIFMTU: /* Set the MTU of a device */ |
4841 | return dev_set_mtu(dev, ifr->ifr_mtu); | |
1da177e4 | 4842 | |
d1b19dff ED |
4843 | case SIOCSIFHWADDR: |
4844 | return dev_set_mac_address(dev, &ifr->ifr_hwaddr); | |
1da177e4 | 4845 | |
d1b19dff ED |
4846 | case SIOCSIFHWBROADCAST: |
4847 | if (ifr->ifr_hwaddr.sa_family != dev->type) | |
4848 | return -EINVAL; | |
4849 | memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data, | |
4850 | min(sizeof ifr->ifr_hwaddr.sa_data, (size_t) dev->addr_len)); | |
4851 | call_netdevice_notifiers(NETDEV_CHANGEADDR, dev); | |
4852 | return 0; | |
1da177e4 | 4853 | |
d1b19dff ED |
4854 | case SIOCSIFMAP: |
4855 | if (ops->ndo_set_config) { | |
1da177e4 LT |
4856 | if (!netif_device_present(dev)) |
4857 | return -ENODEV; | |
d1b19dff ED |
4858 | return ops->ndo_set_config(dev, &ifr->ifr_map); |
4859 | } | |
4860 | return -EOPNOTSUPP; | |
1da177e4 | 4861 | |
d1b19dff ED |
4862 | case SIOCADDMULTI: |
4863 | if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) || | |
4864 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) | |
4865 | return -EINVAL; | |
4866 | if (!netif_device_present(dev)) | |
4867 | return -ENODEV; | |
22bedad3 | 4868 | return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data); |
d1b19dff ED |
4869 | |
4870 | case SIOCDELMULTI: | |
4871 | if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) || | |
4872 | ifr->ifr_hwaddr.sa_family != AF_UNSPEC) | |
4873 | return -EINVAL; | |
4874 | if (!netif_device_present(dev)) | |
4875 | return -ENODEV; | |
22bedad3 | 4876 | return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data); |
1da177e4 | 4877 | |
d1b19dff ED |
4878 | case SIOCSIFTXQLEN: |
4879 | if (ifr->ifr_qlen < 0) | |
4880 | return -EINVAL; | |
4881 | dev->tx_queue_len = ifr->ifr_qlen; | |
4882 | return 0; | |
1da177e4 | 4883 | |
d1b19dff ED |
4884 | case SIOCSIFNAME: |
4885 | ifr->ifr_newname[IFNAMSIZ-1] = '\0'; | |
4886 | return dev_change_name(dev, ifr->ifr_newname); | |
1da177e4 | 4887 | |
d1b19dff ED |
4888 | /* |
4889 | * Unknown or private ioctl | |
4890 | */ | |
4891 | default: | |
4892 | if ((cmd >= SIOCDEVPRIVATE && | |
4893 | cmd <= SIOCDEVPRIVATE + 15) || | |
4894 | cmd == SIOCBONDENSLAVE || | |
4895 | cmd == SIOCBONDRELEASE || | |
4896 | cmd == SIOCBONDSETHWADDR || | |
4897 | cmd == SIOCBONDSLAVEINFOQUERY || | |
4898 | cmd == SIOCBONDINFOQUERY || | |
4899 | cmd == SIOCBONDCHANGEACTIVE || | |
4900 | cmd == SIOCGMIIPHY || | |
4901 | cmd == SIOCGMIIREG || | |
4902 | cmd == SIOCSMIIREG || | |
4903 | cmd == SIOCBRADDIF || | |
4904 | cmd == SIOCBRDELIF || | |
4905 | cmd == SIOCSHWTSTAMP || | |
4906 | cmd == SIOCWANDEV) { | |
4907 | err = -EOPNOTSUPP; | |
4908 | if (ops->ndo_do_ioctl) { | |
4909 | if (netif_device_present(dev)) | |
4910 | err = ops->ndo_do_ioctl(dev, ifr, cmd); | |
4911 | else | |
4912 | err = -ENODEV; | |
4913 | } | |
4914 | } else | |
4915 | err = -EINVAL; | |
1da177e4 LT |
4916 | |
4917 | } | |
4918 | return err; | |
4919 | } | |
4920 | ||
4921 | /* | |
4922 | * This function handles all "interface"-type I/O control requests. The actual | |
4923 | * 'doing' part of this is dev_ifsioc above. | |
4924 | */ | |
4925 | ||
4926 | /** | |
4927 | * dev_ioctl - network device ioctl | |
c4ea43c5 | 4928 | * @net: the applicable net namespace |
1da177e4 LT |
4929 | * @cmd: command to issue |
4930 | * @arg: pointer to a struct ifreq in user space | |
4931 | * | |
4932 | * Issue ioctl functions to devices. This is normally called by the | |
4933 | * user space syscall interfaces but can sometimes be useful for | |
4934 | * other purposes. The return value is the return from the syscall if | |
4935 | * positive or a negative errno code on error. | |
4936 | */ | |
4937 | ||
881d966b | 4938 | int dev_ioctl(struct net *net, unsigned int cmd, void __user *arg) |
1da177e4 LT |
4939 | { |
4940 | struct ifreq ifr; | |
4941 | int ret; | |
4942 | char *colon; | |
4943 | ||
4944 | /* One special case: SIOCGIFCONF takes ifconf argument | |
4945 | and requires shared lock, because it sleeps writing | |
4946 | to user space. | |
4947 | */ | |
4948 | ||
4949 | if (cmd == SIOCGIFCONF) { | |
6756ae4b | 4950 | rtnl_lock(); |
881d966b | 4951 | ret = dev_ifconf(net, (char __user *) arg); |
6756ae4b | 4952 | rtnl_unlock(); |
1da177e4 LT |
4953 | return ret; |
4954 | } | |
4955 | if (cmd == SIOCGIFNAME) | |
881d966b | 4956 | return dev_ifname(net, (struct ifreq __user *)arg); |
1da177e4 LT |
4957 | |
4958 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
4959 | return -EFAULT; | |
4960 | ||
4961 | ifr.ifr_name[IFNAMSIZ-1] = 0; | |
4962 | ||
4963 | colon = strchr(ifr.ifr_name, ':'); | |
4964 | if (colon) | |
4965 | *colon = 0; | |
4966 | ||
4967 | /* | |
4968 | * See which interface the caller is talking about. | |
4969 | */ | |
4970 | ||
4971 | switch (cmd) { | |
d1b19dff ED |
4972 | /* |
4973 | * These ioctl calls: | |
4974 | * - can be done by all. | |
4975 | * - atomic and do not require locking. | |
4976 | * - return a value | |
4977 | */ | |
4978 | case SIOCGIFFLAGS: | |
4979 | case SIOCGIFMETRIC: | |
4980 | case SIOCGIFMTU: | |
4981 | case SIOCGIFHWADDR: | |
4982 | case SIOCGIFSLAVE: | |
4983 | case SIOCGIFMAP: | |
4984 | case SIOCGIFINDEX: | |
4985 | case SIOCGIFTXQLEN: | |
4986 | dev_load(net, ifr.ifr_name); | |
3710becf | 4987 | rcu_read_lock(); |
d1b19dff | 4988 | ret = dev_ifsioc_locked(net, &ifr, cmd); |
3710becf | 4989 | rcu_read_unlock(); |
d1b19dff ED |
4990 | if (!ret) { |
4991 | if (colon) | |
4992 | *colon = ':'; | |
4993 | if (copy_to_user(arg, &ifr, | |
4994 | sizeof(struct ifreq))) | |
4995 | ret = -EFAULT; | |
4996 | } | |
4997 | return ret; | |
1da177e4 | 4998 | |
d1b19dff ED |
4999 | case SIOCETHTOOL: |
5000 | dev_load(net, ifr.ifr_name); | |
5001 | rtnl_lock(); | |
5002 | ret = dev_ethtool(net, &ifr); | |
5003 | rtnl_unlock(); | |
5004 | if (!ret) { | |
5005 | if (colon) | |
5006 | *colon = ':'; | |
5007 | if (copy_to_user(arg, &ifr, | |
5008 | sizeof(struct ifreq))) | |
5009 | ret = -EFAULT; | |
5010 | } | |
5011 | return ret; | |
1da177e4 | 5012 | |
d1b19dff ED |
5013 | /* |
5014 | * These ioctl calls: | |
5015 | * - require superuser power. | |
5016 | * - require strict serialization. | |
5017 | * - return a value | |
5018 | */ | |
5019 | case SIOCGMIIPHY: | |
5020 | case SIOCGMIIREG: | |
5021 | case SIOCSIFNAME: | |
5022 | if (!capable(CAP_NET_ADMIN)) | |
5023 | return -EPERM; | |
5024 | dev_load(net, ifr.ifr_name); | |
5025 | rtnl_lock(); | |
5026 | ret = dev_ifsioc(net, &ifr, cmd); | |
5027 | rtnl_unlock(); | |
5028 | if (!ret) { | |
5029 | if (colon) | |
5030 | *colon = ':'; | |
5031 | if (copy_to_user(arg, &ifr, | |
5032 | sizeof(struct ifreq))) | |
5033 | ret = -EFAULT; | |
5034 | } | |
5035 | return ret; | |
1da177e4 | 5036 | |
d1b19dff ED |
5037 | /* |
5038 | * These ioctl calls: | |
5039 | * - require superuser power. | |
5040 | * - require strict serialization. | |
5041 | * - do not return a value | |
5042 | */ | |
5043 | case SIOCSIFFLAGS: | |
5044 | case SIOCSIFMETRIC: | |
5045 | case SIOCSIFMTU: | |
5046 | case SIOCSIFMAP: | |
5047 | case SIOCSIFHWADDR: | |
5048 | case SIOCSIFSLAVE: | |
5049 | case SIOCADDMULTI: | |
5050 | case SIOCDELMULTI: | |
5051 | case SIOCSIFHWBROADCAST: | |
5052 | case SIOCSIFTXQLEN: | |
5053 | case SIOCSMIIREG: | |
5054 | case SIOCBONDENSLAVE: | |
5055 | case SIOCBONDRELEASE: | |
5056 | case SIOCBONDSETHWADDR: | |
5057 | case SIOCBONDCHANGEACTIVE: | |
5058 | case SIOCBRADDIF: | |
5059 | case SIOCBRDELIF: | |
5060 | case SIOCSHWTSTAMP: | |
5061 | if (!capable(CAP_NET_ADMIN)) | |
5062 | return -EPERM; | |
5063 | /* fall through */ | |
5064 | case SIOCBONDSLAVEINFOQUERY: | |
5065 | case SIOCBONDINFOQUERY: | |
5066 | dev_load(net, ifr.ifr_name); | |
5067 | rtnl_lock(); | |
5068 | ret = dev_ifsioc(net, &ifr, cmd); | |
5069 | rtnl_unlock(); | |
5070 | return ret; | |
5071 | ||
5072 | case SIOCGIFMEM: | |
5073 | /* Get the per device memory space. We can add this but | |
5074 | * currently do not support it */ | |
5075 | case SIOCSIFMEM: | |
5076 | /* Set the per device memory buffer space. | |
5077 | * Not applicable in our case */ | |
5078 | case SIOCSIFLINK: | |
5079 | return -EINVAL; | |
5080 | ||
5081 | /* | |
5082 | * Unknown or private ioctl. | |
5083 | */ | |
5084 | default: | |
5085 | if (cmd == SIOCWANDEV || | |
5086 | (cmd >= SIOCDEVPRIVATE && | |
5087 | cmd <= SIOCDEVPRIVATE + 15)) { | |
881d966b | 5088 | dev_load(net, ifr.ifr_name); |
1da177e4 | 5089 | rtnl_lock(); |
881d966b | 5090 | ret = dev_ifsioc(net, &ifr, cmd); |
1da177e4 | 5091 | rtnl_unlock(); |
d1b19dff ED |
5092 | if (!ret && copy_to_user(arg, &ifr, |
5093 | sizeof(struct ifreq))) | |
5094 | ret = -EFAULT; | |
1da177e4 | 5095 | return ret; |
d1b19dff ED |
5096 | } |
5097 | /* Take care of Wireless Extensions */ | |
5098 | if (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) | |
5099 | return wext_handle_ioctl(net, &ifr, cmd, arg); | |
5100 | return -EINVAL; | |
1da177e4 LT |
5101 | } |
5102 | } | |
5103 | ||
5104 | ||
5105 | /** | |
5106 | * dev_new_index - allocate an ifindex | |
c4ea43c5 | 5107 | * @net: the applicable net namespace |
1da177e4 LT |
5108 | * |
5109 | * Returns a suitable unique value for a new device interface | |
5110 | * number. The caller must hold the rtnl semaphore or the | |
5111 | * dev_base_lock to be sure it remains unique. | |
5112 | */ | |
881d966b | 5113 | static int dev_new_index(struct net *net) |
1da177e4 LT |
5114 | { |
5115 | static int ifindex; | |
5116 | for (;;) { | |
5117 | if (++ifindex <= 0) | |
5118 | ifindex = 1; | |
881d966b | 5119 | if (!__dev_get_by_index(net, ifindex)) |
1da177e4 LT |
5120 | return ifindex; |
5121 | } | |
5122 | } | |
5123 | ||
1da177e4 | 5124 | /* Delayed registration/unregisteration */ |
3b5b34fd | 5125 | static LIST_HEAD(net_todo_list); |
1da177e4 | 5126 | |
6f05f629 | 5127 | static void net_set_todo(struct net_device *dev) |
1da177e4 | 5128 | { |
1da177e4 | 5129 | list_add_tail(&dev->todo_list, &net_todo_list); |
1da177e4 LT |
5130 | } |
5131 | ||
9b5e383c | 5132 | static void rollback_registered_many(struct list_head *head) |
93ee31f1 | 5133 | { |
e93737b0 | 5134 | struct net_device *dev, *tmp; |
9b5e383c | 5135 | |
93ee31f1 DL |
5136 | BUG_ON(dev_boot_phase); |
5137 | ASSERT_RTNL(); | |
5138 | ||
e93737b0 | 5139 | list_for_each_entry_safe(dev, tmp, head, unreg_list) { |
9b5e383c | 5140 | /* Some devices call without registering |
e93737b0 KK |
5141 | * for initialization unwind. Remove those |
5142 | * devices and proceed with the remaining. | |
9b5e383c ED |
5143 | */ |
5144 | if (dev->reg_state == NETREG_UNINITIALIZED) { | |
5145 | pr_debug("unregister_netdevice: device %s/%p never " | |
5146 | "was registered\n", dev->name, dev); | |
93ee31f1 | 5147 | |
9b5e383c | 5148 | WARN_ON(1); |
e93737b0 KK |
5149 | list_del(&dev->unreg_list); |
5150 | continue; | |
9b5e383c | 5151 | } |
93ee31f1 | 5152 | |
9b5e383c | 5153 | BUG_ON(dev->reg_state != NETREG_REGISTERED); |
44345724 | 5154 | } |
93ee31f1 | 5155 | |
44345724 OP |
5156 | /* If device is running, close it first. */ |
5157 | dev_close_many(head); | |
93ee31f1 | 5158 | |
44345724 | 5159 | list_for_each_entry(dev, head, unreg_list) { |
9b5e383c ED |
5160 | /* And unlink it from device chain. */ |
5161 | unlist_netdevice(dev); | |
93ee31f1 | 5162 | |
9b5e383c ED |
5163 | dev->reg_state = NETREG_UNREGISTERING; |
5164 | } | |
93ee31f1 DL |
5165 | |
5166 | synchronize_net(); | |
5167 | ||
9b5e383c ED |
5168 | list_for_each_entry(dev, head, unreg_list) { |
5169 | /* Shutdown queueing discipline. */ | |
5170 | dev_shutdown(dev); | |
93ee31f1 DL |
5171 | |
5172 | ||
9b5e383c ED |
5173 | /* Notify protocols, that we are about to destroy |
5174 | this device. They should clean all the things. | |
5175 | */ | |
5176 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
93ee31f1 | 5177 | |
a2835763 PM |
5178 | if (!dev->rtnl_link_ops || |
5179 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
5180 | rtmsg_ifinfo(RTM_DELLINK, dev, ~0U); | |
5181 | ||
9b5e383c ED |
5182 | /* |
5183 | * Flush the unicast and multicast chains | |
5184 | */ | |
a748ee24 | 5185 | dev_uc_flush(dev); |
22bedad3 | 5186 | dev_mc_flush(dev); |
93ee31f1 | 5187 | |
9b5e383c ED |
5188 | if (dev->netdev_ops->ndo_uninit) |
5189 | dev->netdev_ops->ndo_uninit(dev); | |
93ee31f1 | 5190 | |
9b5e383c ED |
5191 | /* Notifier chain MUST detach us from master device. */ |
5192 | WARN_ON(dev->master); | |
93ee31f1 | 5193 | |
9b5e383c ED |
5194 | /* Remove entries from kobject tree */ |
5195 | netdev_unregister_kobject(dev); | |
5196 | } | |
93ee31f1 | 5197 | |
a5ee1551 | 5198 | /* Process any work delayed until the end of the batch */ |
e5e26d75 | 5199 | dev = list_first_entry(head, struct net_device, unreg_list); |
a5ee1551 | 5200 | call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev); |
93ee31f1 | 5201 | |
ef885afb | 5202 | rcu_barrier(); |
395264d5 | 5203 | |
a5ee1551 | 5204 | list_for_each_entry(dev, head, unreg_list) |
9b5e383c ED |
5205 | dev_put(dev); |
5206 | } | |
5207 | ||
5208 | static void rollback_registered(struct net_device *dev) | |
5209 | { | |
5210 | LIST_HEAD(single); | |
5211 | ||
5212 | list_add(&dev->unreg_list, &single); | |
5213 | rollback_registered_many(&single); | |
93ee31f1 DL |
5214 | } |
5215 | ||
04ed3e74 | 5216 | u32 netdev_fix_features(u32 features, const char *name) |
b63365a2 | 5217 | { |
57422dc5 MM |
5218 | /* Fix illegal checksum combinations */ |
5219 | if ((features & NETIF_F_HW_CSUM) && | |
5220 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
5221 | if (name) | |
5222 | printk(KERN_NOTICE "%s: mixed HW and IP checksum settings.\n", | |
5223 | name); | |
5224 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM); | |
5225 | } | |
5226 | ||
5227 | if ((features & NETIF_F_NO_CSUM) && | |
5228 | (features & (NETIF_F_HW_CSUM|NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
5229 | if (name) | |
5230 | printk(KERN_NOTICE "%s: mixed no checksumming and other settings.\n", | |
5231 | name); | |
5232 | features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM|NETIF_F_HW_CSUM); | |
5233 | } | |
5234 | ||
b63365a2 HX |
5235 | /* Fix illegal SG+CSUM combinations. */ |
5236 | if ((features & NETIF_F_SG) && | |
5237 | !(features & NETIF_F_ALL_CSUM)) { | |
5238 | if (name) | |
5239 | printk(KERN_NOTICE "%s: Dropping NETIF_F_SG since no " | |
5240 | "checksum feature.\n", name); | |
5241 | features &= ~NETIF_F_SG; | |
5242 | } | |
5243 | ||
5244 | /* TSO requires that SG is present as well. */ | |
5245 | if ((features & NETIF_F_TSO) && !(features & NETIF_F_SG)) { | |
5246 | if (name) | |
5247 | printk(KERN_NOTICE "%s: Dropping NETIF_F_TSO since no " | |
5248 | "SG feature.\n", name); | |
5249 | features &= ~NETIF_F_TSO; | |
5250 | } | |
5251 | ||
5252 | if (features & NETIF_F_UFO) { | |
79032644 MM |
5253 | /* maybe split UFO into V4 and V6? */ |
5254 | if (!((features & NETIF_F_GEN_CSUM) || | |
5255 | (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM)) | |
5256 | == (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) { | |
b63365a2 HX |
5257 | if (name) |
5258 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO " | |
79032644 | 5259 | "since no checksum offload features.\n", |
b63365a2 HX |
5260 | name); |
5261 | features &= ~NETIF_F_UFO; | |
5262 | } | |
5263 | ||
5264 | if (!(features & NETIF_F_SG)) { | |
5265 | if (name) | |
5266 | printk(KERN_ERR "%s: Dropping NETIF_F_UFO " | |
5267 | "since no NETIF_F_SG feature.\n", name); | |
5268 | features &= ~NETIF_F_UFO; | |
5269 | } | |
5270 | } | |
5271 | ||
5272 | return features; | |
5273 | } | |
5274 | EXPORT_SYMBOL(netdev_fix_features); | |
5275 | ||
fc4a7489 PM |
5276 | /** |
5277 | * netif_stacked_transfer_operstate - transfer operstate | |
5278 | * @rootdev: the root or lower level device to transfer state from | |
5279 | * @dev: the device to transfer operstate to | |
5280 | * | |
5281 | * Transfer operational state from root to device. This is normally | |
5282 | * called when a stacking relationship exists between the root | |
5283 | * device and the device(a leaf device). | |
5284 | */ | |
5285 | void netif_stacked_transfer_operstate(const struct net_device *rootdev, | |
5286 | struct net_device *dev) | |
5287 | { | |
5288 | if (rootdev->operstate == IF_OPER_DORMANT) | |
5289 | netif_dormant_on(dev); | |
5290 | else | |
5291 | netif_dormant_off(dev); | |
5292 | ||
5293 | if (netif_carrier_ok(rootdev)) { | |
5294 | if (!netif_carrier_ok(dev)) | |
5295 | netif_carrier_on(dev); | |
5296 | } else { | |
5297 | if (netif_carrier_ok(dev)) | |
5298 | netif_carrier_off(dev); | |
5299 | } | |
5300 | } | |
5301 | EXPORT_SYMBOL(netif_stacked_transfer_operstate); | |
5302 | ||
bf264145 | 5303 | #ifdef CONFIG_RPS |
1b4bf461 ED |
5304 | static int netif_alloc_rx_queues(struct net_device *dev) |
5305 | { | |
1b4bf461 | 5306 | unsigned int i, count = dev->num_rx_queues; |
bd25fa7b | 5307 | struct netdev_rx_queue *rx; |
1b4bf461 | 5308 | |
bd25fa7b | 5309 | BUG_ON(count < 1); |
1b4bf461 | 5310 | |
bd25fa7b TH |
5311 | rx = kcalloc(count, sizeof(struct netdev_rx_queue), GFP_KERNEL); |
5312 | if (!rx) { | |
5313 | pr_err("netdev: Unable to allocate %u rx queues.\n", count); | |
5314 | return -ENOMEM; | |
1b4bf461 | 5315 | } |
bd25fa7b TH |
5316 | dev->_rx = rx; |
5317 | ||
bd25fa7b | 5318 | for (i = 0; i < count; i++) |
fe822240 | 5319 | rx[i].dev = dev; |
1b4bf461 ED |
5320 | return 0; |
5321 | } | |
bf264145 | 5322 | #endif |
1b4bf461 | 5323 | |
aa942104 CG |
5324 | static void netdev_init_one_queue(struct net_device *dev, |
5325 | struct netdev_queue *queue, void *_unused) | |
5326 | { | |
5327 | /* Initialize queue lock */ | |
5328 | spin_lock_init(&queue->_xmit_lock); | |
5329 | netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type); | |
5330 | queue->xmit_lock_owner = -1; | |
b236da69 | 5331 | netdev_queue_numa_node_write(queue, NUMA_NO_NODE); |
aa942104 CG |
5332 | queue->dev = dev; |
5333 | } | |
5334 | ||
e6484930 TH |
5335 | static int netif_alloc_netdev_queues(struct net_device *dev) |
5336 | { | |
5337 | unsigned int count = dev->num_tx_queues; | |
5338 | struct netdev_queue *tx; | |
5339 | ||
5340 | BUG_ON(count < 1); | |
5341 | ||
5342 | tx = kcalloc(count, sizeof(struct netdev_queue), GFP_KERNEL); | |
5343 | if (!tx) { | |
5344 | pr_err("netdev: Unable to allocate %u tx queues.\n", | |
5345 | count); | |
5346 | return -ENOMEM; | |
5347 | } | |
5348 | dev->_tx = tx; | |
1d24eb48 | 5349 | |
e6484930 TH |
5350 | netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL); |
5351 | spin_lock_init(&dev->tx_global_lock); | |
aa942104 CG |
5352 | |
5353 | return 0; | |
e6484930 TH |
5354 | } |
5355 | ||
1da177e4 LT |
5356 | /** |
5357 | * register_netdevice - register a network device | |
5358 | * @dev: device to register | |
5359 | * | |
5360 | * Take a completed network device structure and add it to the kernel | |
5361 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
5362 | * chain. 0 is returned on success. A negative errno code is returned | |
5363 | * on a failure to set up the device, or if the name is a duplicate. | |
5364 | * | |
5365 | * Callers must hold the rtnl semaphore. You may want | |
5366 | * register_netdev() instead of this. | |
5367 | * | |
5368 | * BUGS: | |
5369 | * The locking appears insufficient to guarantee two parallel registers | |
5370 | * will not get the same name. | |
5371 | */ | |
5372 | ||
5373 | int register_netdevice(struct net_device *dev) | |
5374 | { | |
1da177e4 | 5375 | int ret; |
d314774c | 5376 | struct net *net = dev_net(dev); |
1da177e4 LT |
5377 | |
5378 | BUG_ON(dev_boot_phase); | |
5379 | ASSERT_RTNL(); | |
5380 | ||
b17a7c17 SH |
5381 | might_sleep(); |
5382 | ||
1da177e4 LT |
5383 | /* When net_device's are persistent, this will be fatal. */ |
5384 | BUG_ON(dev->reg_state != NETREG_UNINITIALIZED); | |
d314774c | 5385 | BUG_ON(!net); |
1da177e4 | 5386 | |
f1f28aa3 | 5387 | spin_lock_init(&dev->addr_list_lock); |
cf508b12 | 5388 | netdev_set_addr_lockdep_class(dev); |
1da177e4 | 5389 | |
1da177e4 LT |
5390 | dev->iflink = -1; |
5391 | ||
5392 | /* Init, if this function is available */ | |
d314774c SH |
5393 | if (dev->netdev_ops->ndo_init) { |
5394 | ret = dev->netdev_ops->ndo_init(dev); | |
1da177e4 LT |
5395 | if (ret) { |
5396 | if (ret > 0) | |
5397 | ret = -EIO; | |
90833aa4 | 5398 | goto out; |
1da177e4 LT |
5399 | } |
5400 | } | |
4ec93edb | 5401 | |
8ce6cebc | 5402 | ret = dev_get_valid_name(dev, dev->name, 0); |
d9031024 | 5403 | if (ret) |
7ce1b0ed | 5404 | goto err_uninit; |
1da177e4 | 5405 | |
881d966b | 5406 | dev->ifindex = dev_new_index(net); |
1da177e4 LT |
5407 | if (dev->iflink == -1) |
5408 | dev->iflink = dev->ifindex; | |
5409 | ||
b63365a2 | 5410 | dev->features = netdev_fix_features(dev->features, dev->name); |
1da177e4 | 5411 | |
e5a4a72d LB |
5412 | /* Enable software GSO if SG is supported. */ |
5413 | if (dev->features & NETIF_F_SG) | |
5414 | dev->features |= NETIF_F_GSO; | |
5415 | ||
c5256c51 ED |
5416 | /* Enable GRO and NETIF_F_HIGHDMA for vlans by default, |
5417 | * vlan_dev_init() will do the dev->features check, so these features | |
5418 | * are enabled only if supported by underlying device. | |
16c3ea78 | 5419 | */ |
c5256c51 | 5420 | dev->vlan_features |= (NETIF_F_GRO | NETIF_F_HIGHDMA); |
16c3ea78 | 5421 | |
7ffbe3fd JB |
5422 | ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev); |
5423 | ret = notifier_to_errno(ret); | |
5424 | if (ret) | |
5425 | goto err_uninit; | |
5426 | ||
8b41d188 | 5427 | ret = netdev_register_kobject(dev); |
b17a7c17 | 5428 | if (ret) |
7ce1b0ed | 5429 | goto err_uninit; |
b17a7c17 SH |
5430 | dev->reg_state = NETREG_REGISTERED; |
5431 | ||
1da177e4 LT |
5432 | /* |
5433 | * Default initial state at registry is that the | |
5434 | * device is present. | |
5435 | */ | |
5436 | ||
5437 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
5438 | ||
1da177e4 | 5439 | dev_init_scheduler(dev); |
1da177e4 | 5440 | dev_hold(dev); |
ce286d32 | 5441 | list_netdevice(dev); |
1da177e4 LT |
5442 | |
5443 | /* Notify protocols, that a new device appeared. */ | |
056925ab | 5444 | ret = call_netdevice_notifiers(NETDEV_REGISTER, dev); |
fcc5a03a | 5445 | ret = notifier_to_errno(ret); |
93ee31f1 DL |
5446 | if (ret) { |
5447 | rollback_registered(dev); | |
5448 | dev->reg_state = NETREG_UNREGISTERED; | |
5449 | } | |
d90a909e EB |
5450 | /* |
5451 | * Prevent userspace races by waiting until the network | |
5452 | * device is fully setup before sending notifications. | |
5453 | */ | |
a2835763 PM |
5454 | if (!dev->rtnl_link_ops || |
5455 | dev->rtnl_link_state == RTNL_LINK_INITIALIZED) | |
5456 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); | |
1da177e4 LT |
5457 | |
5458 | out: | |
5459 | return ret; | |
7ce1b0ed HX |
5460 | |
5461 | err_uninit: | |
d314774c SH |
5462 | if (dev->netdev_ops->ndo_uninit) |
5463 | dev->netdev_ops->ndo_uninit(dev); | |
7ce1b0ed | 5464 | goto out; |
1da177e4 | 5465 | } |
d1b19dff | 5466 | EXPORT_SYMBOL(register_netdevice); |
1da177e4 | 5467 | |
937f1ba5 BH |
5468 | /** |
5469 | * init_dummy_netdev - init a dummy network device for NAPI | |
5470 | * @dev: device to init | |
5471 | * | |
5472 | * This takes a network device structure and initialize the minimum | |
5473 | * amount of fields so it can be used to schedule NAPI polls without | |
5474 | * registering a full blown interface. This is to be used by drivers | |
5475 | * that need to tie several hardware interfaces to a single NAPI | |
5476 | * poll scheduler due to HW limitations. | |
5477 | */ | |
5478 | int init_dummy_netdev(struct net_device *dev) | |
5479 | { | |
5480 | /* Clear everything. Note we don't initialize spinlocks | |
5481 | * are they aren't supposed to be taken by any of the | |
5482 | * NAPI code and this dummy netdev is supposed to be | |
5483 | * only ever used for NAPI polls | |
5484 | */ | |
5485 | memset(dev, 0, sizeof(struct net_device)); | |
5486 | ||
5487 | /* make sure we BUG if trying to hit standard | |
5488 | * register/unregister code path | |
5489 | */ | |
5490 | dev->reg_state = NETREG_DUMMY; | |
5491 | ||
937f1ba5 BH |
5492 | /* NAPI wants this */ |
5493 | INIT_LIST_HEAD(&dev->napi_list); | |
5494 | ||
5495 | /* a dummy interface is started by default */ | |
5496 | set_bit(__LINK_STATE_PRESENT, &dev->state); | |
5497 | set_bit(__LINK_STATE_START, &dev->state); | |
5498 | ||
29b4433d ED |
5499 | /* Note : We dont allocate pcpu_refcnt for dummy devices, |
5500 | * because users of this 'device' dont need to change | |
5501 | * its refcount. | |
5502 | */ | |
5503 | ||
937f1ba5 BH |
5504 | return 0; |
5505 | } | |
5506 | EXPORT_SYMBOL_GPL(init_dummy_netdev); | |
5507 | ||
5508 | ||
1da177e4 LT |
5509 | /** |
5510 | * register_netdev - register a network device | |
5511 | * @dev: device to register | |
5512 | * | |
5513 | * Take a completed network device structure and add it to the kernel | |
5514 | * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier | |
5515 | * chain. 0 is returned on success. A negative errno code is returned | |
5516 | * on a failure to set up the device, or if the name is a duplicate. | |
5517 | * | |
38b4da38 | 5518 | * This is a wrapper around register_netdevice that takes the rtnl semaphore |
1da177e4 LT |
5519 | * and expands the device name if you passed a format string to |
5520 | * alloc_netdev. | |
5521 | */ | |
5522 | int register_netdev(struct net_device *dev) | |
5523 | { | |
5524 | int err; | |
5525 | ||
5526 | rtnl_lock(); | |
5527 | ||
5528 | /* | |
5529 | * If the name is a format string the caller wants us to do a | |
5530 | * name allocation. | |
5531 | */ | |
5532 | if (strchr(dev->name, '%')) { | |
5533 | err = dev_alloc_name(dev, dev->name); | |
5534 | if (err < 0) | |
5535 | goto out; | |
5536 | } | |
4ec93edb | 5537 | |
1da177e4 LT |
5538 | err = register_netdevice(dev); |
5539 | out: | |
5540 | rtnl_unlock(); | |
5541 | return err; | |
5542 | } | |
5543 | EXPORT_SYMBOL(register_netdev); | |
5544 | ||
29b4433d ED |
5545 | int netdev_refcnt_read(const struct net_device *dev) |
5546 | { | |
5547 | int i, refcnt = 0; | |
5548 | ||
5549 | for_each_possible_cpu(i) | |
5550 | refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i); | |
5551 | return refcnt; | |
5552 | } | |
5553 | EXPORT_SYMBOL(netdev_refcnt_read); | |
5554 | ||
1da177e4 LT |
5555 | /* |
5556 | * netdev_wait_allrefs - wait until all references are gone. | |
5557 | * | |
5558 | * This is called when unregistering network devices. | |
5559 | * | |
5560 | * Any protocol or device that holds a reference should register | |
5561 | * for netdevice notification, and cleanup and put back the | |
5562 | * reference if they receive an UNREGISTER event. | |
5563 | * We can get stuck here if buggy protocols don't correctly | |
4ec93edb | 5564 | * call dev_put. |
1da177e4 LT |
5565 | */ |
5566 | static void netdev_wait_allrefs(struct net_device *dev) | |
5567 | { | |
5568 | unsigned long rebroadcast_time, warning_time; | |
29b4433d | 5569 | int refcnt; |
1da177e4 | 5570 | |
e014debe ED |
5571 | linkwatch_forget_dev(dev); |
5572 | ||
1da177e4 | 5573 | rebroadcast_time = warning_time = jiffies; |
29b4433d ED |
5574 | refcnt = netdev_refcnt_read(dev); |
5575 | ||
5576 | while (refcnt != 0) { | |
1da177e4 | 5577 | if (time_after(jiffies, rebroadcast_time + 1 * HZ)) { |
6756ae4b | 5578 | rtnl_lock(); |
1da177e4 LT |
5579 | |
5580 | /* Rebroadcast unregister notification */ | |
056925ab | 5581 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); |
a5ee1551 | 5582 | /* don't resend NETDEV_UNREGISTER_BATCH, _BATCH users |
395264d5 | 5583 | * should have already handle it the first time */ |
1da177e4 LT |
5584 | |
5585 | if (test_bit(__LINK_STATE_LINKWATCH_PENDING, | |
5586 | &dev->state)) { | |
5587 | /* We must not have linkwatch events | |
5588 | * pending on unregister. If this | |
5589 | * happens, we simply run the queue | |
5590 | * unscheduled, resulting in a noop | |
5591 | * for this device. | |
5592 | */ | |
5593 | linkwatch_run_queue(); | |
5594 | } | |
5595 | ||
6756ae4b | 5596 | __rtnl_unlock(); |
1da177e4 LT |
5597 | |
5598 | rebroadcast_time = jiffies; | |
5599 | } | |
5600 | ||
5601 | msleep(250); | |
5602 | ||
29b4433d ED |
5603 | refcnt = netdev_refcnt_read(dev); |
5604 | ||
1da177e4 LT |
5605 | if (time_after(jiffies, warning_time + 10 * HZ)) { |
5606 | printk(KERN_EMERG "unregister_netdevice: " | |
5607 | "waiting for %s to become free. Usage " | |
5608 | "count = %d\n", | |
29b4433d | 5609 | dev->name, refcnt); |
1da177e4 LT |
5610 | warning_time = jiffies; |
5611 | } | |
5612 | } | |
5613 | } | |
5614 | ||
5615 | /* The sequence is: | |
5616 | * | |
5617 | * rtnl_lock(); | |
5618 | * ... | |
5619 | * register_netdevice(x1); | |
5620 | * register_netdevice(x2); | |
5621 | * ... | |
5622 | * unregister_netdevice(y1); | |
5623 | * unregister_netdevice(y2); | |
5624 | * ... | |
5625 | * rtnl_unlock(); | |
5626 | * free_netdev(y1); | |
5627 | * free_netdev(y2); | |
5628 | * | |
58ec3b4d | 5629 | * We are invoked by rtnl_unlock(). |
1da177e4 | 5630 | * This allows us to deal with problems: |
b17a7c17 | 5631 | * 1) We can delete sysfs objects which invoke hotplug |
1da177e4 LT |
5632 | * without deadlocking with linkwatch via keventd. |
5633 | * 2) Since we run with the RTNL semaphore not held, we can sleep | |
5634 | * safely in order to wait for the netdev refcnt to drop to zero. | |
58ec3b4d HX |
5635 | * |
5636 | * We must not return until all unregister events added during | |
5637 | * the interval the lock was held have been completed. | |
1da177e4 | 5638 | */ |
1da177e4 LT |
5639 | void netdev_run_todo(void) |
5640 | { | |
626ab0e6 | 5641 | struct list_head list; |
1da177e4 | 5642 | |
1da177e4 | 5643 | /* Snapshot list, allow later requests */ |
626ab0e6 | 5644 | list_replace_init(&net_todo_list, &list); |
58ec3b4d HX |
5645 | |
5646 | __rtnl_unlock(); | |
626ab0e6 | 5647 | |
1da177e4 LT |
5648 | while (!list_empty(&list)) { |
5649 | struct net_device *dev | |
e5e26d75 | 5650 | = list_first_entry(&list, struct net_device, todo_list); |
1da177e4 LT |
5651 | list_del(&dev->todo_list); |
5652 | ||
b17a7c17 SH |
5653 | if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) { |
5654 | printk(KERN_ERR "network todo '%s' but state %d\n", | |
5655 | dev->name, dev->reg_state); | |
5656 | dump_stack(); | |
5657 | continue; | |
5658 | } | |
1da177e4 | 5659 | |
b17a7c17 | 5660 | dev->reg_state = NETREG_UNREGISTERED; |
1da177e4 | 5661 | |
152102c7 | 5662 | on_each_cpu(flush_backlog, dev, 1); |
6e583ce5 | 5663 | |
b17a7c17 | 5664 | netdev_wait_allrefs(dev); |
1da177e4 | 5665 | |
b17a7c17 | 5666 | /* paranoia */ |
29b4433d | 5667 | BUG_ON(netdev_refcnt_read(dev)); |
95ae6b22 | 5668 | WARN_ON(rcu_dereference_raw(dev->ip_ptr)); |
198caeca | 5669 | WARN_ON(rcu_dereference_raw(dev->ip6_ptr)); |
547b792c | 5670 | WARN_ON(dev->dn_ptr); |
1da177e4 | 5671 | |
b17a7c17 SH |
5672 | if (dev->destructor) |
5673 | dev->destructor(dev); | |
9093bbb2 SH |
5674 | |
5675 | /* Free network device */ | |
5676 | kobject_put(&dev->dev.kobj); | |
1da177e4 | 5677 | } |
1da177e4 LT |
5678 | } |
5679 | ||
3cfde79c BH |
5680 | /* Convert net_device_stats to rtnl_link_stats64. They have the same |
5681 | * fields in the same order, with only the type differing. | |
5682 | */ | |
5683 | static void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64, | |
5684 | const struct net_device_stats *netdev_stats) | |
5685 | { | |
5686 | #if BITS_PER_LONG == 64 | |
5687 | BUILD_BUG_ON(sizeof(*stats64) != sizeof(*netdev_stats)); | |
5688 | memcpy(stats64, netdev_stats, sizeof(*stats64)); | |
5689 | #else | |
5690 | size_t i, n = sizeof(*stats64) / sizeof(u64); | |
5691 | const unsigned long *src = (const unsigned long *)netdev_stats; | |
5692 | u64 *dst = (u64 *)stats64; | |
5693 | ||
5694 | BUILD_BUG_ON(sizeof(*netdev_stats) / sizeof(unsigned long) != | |
5695 | sizeof(*stats64) / sizeof(u64)); | |
5696 | for (i = 0; i < n; i++) | |
5697 | dst[i] = src[i]; | |
5698 | #endif | |
5699 | } | |
5700 | ||
eeda3fd6 SH |
5701 | /** |
5702 | * dev_get_stats - get network device statistics | |
5703 | * @dev: device to get statistics from | |
28172739 | 5704 | * @storage: place to store stats |
eeda3fd6 | 5705 | * |
d7753516 BH |
5706 | * Get network statistics from device. Return @storage. |
5707 | * The device driver may provide its own method by setting | |
5708 | * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats; | |
5709 | * otherwise the internal statistics structure is used. | |
eeda3fd6 | 5710 | */ |
d7753516 BH |
5711 | struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev, |
5712 | struct rtnl_link_stats64 *storage) | |
7004bf25 | 5713 | { |
eeda3fd6 SH |
5714 | const struct net_device_ops *ops = dev->netdev_ops; |
5715 | ||
28172739 ED |
5716 | if (ops->ndo_get_stats64) { |
5717 | memset(storage, 0, sizeof(*storage)); | |
caf586e5 ED |
5718 | ops->ndo_get_stats64(dev, storage); |
5719 | } else if (ops->ndo_get_stats) { | |
3cfde79c | 5720 | netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev)); |
caf586e5 ED |
5721 | } else { |
5722 | netdev_stats_to_stats64(storage, &dev->stats); | |
28172739 | 5723 | } |
caf586e5 | 5724 | storage->rx_dropped += atomic_long_read(&dev->rx_dropped); |
28172739 | 5725 | return storage; |
c45d286e | 5726 | } |
eeda3fd6 | 5727 | EXPORT_SYMBOL(dev_get_stats); |
c45d286e | 5728 | |
24824a09 | 5729 | struct netdev_queue *dev_ingress_queue_create(struct net_device *dev) |
dc2b4847 | 5730 | { |
24824a09 | 5731 | struct netdev_queue *queue = dev_ingress_queue(dev); |
dc2b4847 | 5732 | |
24824a09 ED |
5733 | #ifdef CONFIG_NET_CLS_ACT |
5734 | if (queue) | |
5735 | return queue; | |
5736 | queue = kzalloc(sizeof(*queue), GFP_KERNEL); | |
5737 | if (!queue) | |
5738 | return NULL; | |
5739 | netdev_init_one_queue(dev, queue, NULL); | |
24824a09 ED |
5740 | queue->qdisc = &noop_qdisc; |
5741 | queue->qdisc_sleeping = &noop_qdisc; | |
5742 | rcu_assign_pointer(dev->ingress_queue, queue); | |
5743 | #endif | |
5744 | return queue; | |
bb949fbd DM |
5745 | } |
5746 | ||
1da177e4 | 5747 | /** |
36909ea4 | 5748 | * alloc_netdev_mqs - allocate network device |
1da177e4 LT |
5749 | * @sizeof_priv: size of private data to allocate space for |
5750 | * @name: device name format string | |
5751 | * @setup: callback to initialize device | |
36909ea4 TH |
5752 | * @txqs: the number of TX subqueues to allocate |
5753 | * @rxqs: the number of RX subqueues to allocate | |
1da177e4 LT |
5754 | * |
5755 | * Allocates a struct net_device with private data area for driver use | |
f25f4e44 | 5756 | * and performs basic initialization. Also allocates subquue structs |
36909ea4 | 5757 | * for each queue on the device. |
1da177e4 | 5758 | */ |
36909ea4 TH |
5759 | struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name, |
5760 | void (*setup)(struct net_device *), | |
5761 | unsigned int txqs, unsigned int rxqs) | |
1da177e4 | 5762 | { |
1da177e4 | 5763 | struct net_device *dev; |
7943986c | 5764 | size_t alloc_size; |
1ce8e7b5 | 5765 | struct net_device *p; |
1da177e4 | 5766 | |
b6fe17d6 SH |
5767 | BUG_ON(strlen(name) >= sizeof(dev->name)); |
5768 | ||
36909ea4 | 5769 | if (txqs < 1) { |
55513fb4 TH |
5770 | pr_err("alloc_netdev: Unable to allocate device " |
5771 | "with zero queues.\n"); | |
5772 | return NULL; | |
5773 | } | |
5774 | ||
36909ea4 TH |
5775 | #ifdef CONFIG_RPS |
5776 | if (rxqs < 1) { | |
5777 | pr_err("alloc_netdev: Unable to allocate device " | |
5778 | "with zero RX queues.\n"); | |
5779 | return NULL; | |
5780 | } | |
5781 | #endif | |
5782 | ||
fd2ea0a7 | 5783 | alloc_size = sizeof(struct net_device); |
d1643d24 AD |
5784 | if (sizeof_priv) { |
5785 | /* ensure 32-byte alignment of private area */ | |
1ce8e7b5 | 5786 | alloc_size = ALIGN(alloc_size, NETDEV_ALIGN); |
d1643d24 AD |
5787 | alloc_size += sizeof_priv; |
5788 | } | |
5789 | /* ensure 32-byte alignment of whole construct */ | |
1ce8e7b5 | 5790 | alloc_size += NETDEV_ALIGN - 1; |
1da177e4 | 5791 | |
31380de9 | 5792 | p = kzalloc(alloc_size, GFP_KERNEL); |
1da177e4 | 5793 | if (!p) { |
b6fe17d6 | 5794 | printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n"); |
1da177e4 LT |
5795 | return NULL; |
5796 | } | |
1da177e4 | 5797 | |
1ce8e7b5 | 5798 | dev = PTR_ALIGN(p, NETDEV_ALIGN); |
1da177e4 | 5799 | dev->padded = (char *)dev - (char *)p; |
ab9c73cc | 5800 | |
29b4433d ED |
5801 | dev->pcpu_refcnt = alloc_percpu(int); |
5802 | if (!dev->pcpu_refcnt) | |
e6484930 | 5803 | goto free_p; |
ab9c73cc | 5804 | |
ab9c73cc | 5805 | if (dev_addr_init(dev)) |
29b4433d | 5806 | goto free_pcpu; |
ab9c73cc | 5807 | |
22bedad3 | 5808 | dev_mc_init(dev); |
a748ee24 | 5809 | dev_uc_init(dev); |
ccffad25 | 5810 | |
c346dca1 | 5811 | dev_net_set(dev, &init_net); |
1da177e4 | 5812 | |
36909ea4 TH |
5813 | dev->num_tx_queues = txqs; |
5814 | dev->real_num_tx_queues = txqs; | |
ed9af2e8 TH |
5815 | if (netif_alloc_netdev_queues(dev)) |
5816 | goto free_pcpu; | |
e8a0464c | 5817 | |
df334545 | 5818 | #ifdef CONFIG_RPS |
36909ea4 TH |
5819 | dev->num_rx_queues = rxqs; |
5820 | dev->real_num_rx_queues = rxqs; | |
fe822240 TH |
5821 | if (netif_alloc_rx_queues(dev)) |
5822 | goto free_pcpu; | |
df334545 | 5823 | #endif |
0a9627f2 | 5824 | |
82cc1a7a | 5825 | dev->gso_max_size = GSO_MAX_SIZE; |
1da177e4 | 5826 | |
15682bc4 PWJ |
5827 | INIT_LIST_HEAD(&dev->ethtool_ntuple_list.list); |
5828 | dev->ethtool_ntuple_list.count = 0; | |
d565b0a1 | 5829 | INIT_LIST_HEAD(&dev->napi_list); |
9fdce099 | 5830 | INIT_LIST_HEAD(&dev->unreg_list); |
e014debe | 5831 | INIT_LIST_HEAD(&dev->link_watch_list); |
93f154b5 | 5832 | dev->priv_flags = IFF_XMIT_DST_RELEASE; |
1da177e4 LT |
5833 | setup(dev); |
5834 | strcpy(dev->name, name); | |
cbda10fa | 5835 | dev->group = INIT_NETDEV_GROUP; |
1da177e4 | 5836 | return dev; |
ab9c73cc | 5837 | |
29b4433d ED |
5838 | free_pcpu: |
5839 | free_percpu(dev->pcpu_refcnt); | |
ed9af2e8 | 5840 | kfree(dev->_tx); |
fe822240 TH |
5841 | #ifdef CONFIG_RPS |
5842 | kfree(dev->_rx); | |
5843 | #endif | |
5844 | ||
ab9c73cc JP |
5845 | free_p: |
5846 | kfree(p); | |
5847 | return NULL; | |
1da177e4 | 5848 | } |
36909ea4 | 5849 | EXPORT_SYMBOL(alloc_netdev_mqs); |
1da177e4 LT |
5850 | |
5851 | /** | |
5852 | * free_netdev - free network device | |
5853 | * @dev: device | |
5854 | * | |
4ec93edb YH |
5855 | * This function does the last stage of destroying an allocated device |
5856 | * interface. The reference to the device object is released. | |
1da177e4 LT |
5857 | * If this is the last reference then it will be freed. |
5858 | */ | |
5859 | void free_netdev(struct net_device *dev) | |
5860 | { | |
d565b0a1 HX |
5861 | struct napi_struct *p, *n; |
5862 | ||
f3005d7f DL |
5863 | release_net(dev_net(dev)); |
5864 | ||
e8a0464c | 5865 | kfree(dev->_tx); |
fe822240 TH |
5866 | #ifdef CONFIG_RPS |
5867 | kfree(dev->_rx); | |
5868 | #endif | |
e8a0464c | 5869 | |
24824a09 ED |
5870 | kfree(rcu_dereference_raw(dev->ingress_queue)); |
5871 | ||
f001fde5 JP |
5872 | /* Flush device addresses */ |
5873 | dev_addr_flush(dev); | |
5874 | ||
15682bc4 PWJ |
5875 | /* Clear ethtool n-tuple list */ |
5876 | ethtool_ntuple_flush(dev); | |
5877 | ||
d565b0a1 HX |
5878 | list_for_each_entry_safe(p, n, &dev->napi_list, dev_list) |
5879 | netif_napi_del(p); | |
5880 | ||
29b4433d ED |
5881 | free_percpu(dev->pcpu_refcnt); |
5882 | dev->pcpu_refcnt = NULL; | |
5883 | ||
3041a069 | 5884 | /* Compatibility with error handling in drivers */ |
1da177e4 LT |
5885 | if (dev->reg_state == NETREG_UNINITIALIZED) { |
5886 | kfree((char *)dev - dev->padded); | |
5887 | return; | |
5888 | } | |
5889 | ||
5890 | BUG_ON(dev->reg_state != NETREG_UNREGISTERED); | |
5891 | dev->reg_state = NETREG_RELEASED; | |
5892 | ||
43cb76d9 GKH |
5893 | /* will free via device release */ |
5894 | put_device(&dev->dev); | |
1da177e4 | 5895 | } |
d1b19dff | 5896 | EXPORT_SYMBOL(free_netdev); |
4ec93edb | 5897 | |
f0db275a SH |
5898 | /** |
5899 | * synchronize_net - Synchronize with packet receive processing | |
5900 | * | |
5901 | * Wait for packets currently being received to be done. | |
5902 | * Does not block later packets from starting. | |
5903 | */ | |
4ec93edb | 5904 | void synchronize_net(void) |
1da177e4 LT |
5905 | { |
5906 | might_sleep(); | |
fbd568a3 | 5907 | synchronize_rcu(); |
1da177e4 | 5908 | } |
d1b19dff | 5909 | EXPORT_SYMBOL(synchronize_net); |
1da177e4 LT |
5910 | |
5911 | /** | |
44a0873d | 5912 | * unregister_netdevice_queue - remove device from the kernel |
1da177e4 | 5913 | * @dev: device |
44a0873d | 5914 | * @head: list |
6ebfbc06 | 5915 | * |
1da177e4 | 5916 | * This function shuts down a device interface and removes it |
d59b54b1 | 5917 | * from the kernel tables. |
44a0873d | 5918 | * If head not NULL, device is queued to be unregistered later. |
1da177e4 LT |
5919 | * |
5920 | * Callers must hold the rtnl semaphore. You may want | |
5921 | * unregister_netdev() instead of this. | |
5922 | */ | |
5923 | ||
44a0873d | 5924 | void unregister_netdevice_queue(struct net_device *dev, struct list_head *head) |
1da177e4 | 5925 | { |
a6620712 HX |
5926 | ASSERT_RTNL(); |
5927 | ||
44a0873d | 5928 | if (head) { |
9fdce099 | 5929 | list_move_tail(&dev->unreg_list, head); |
44a0873d ED |
5930 | } else { |
5931 | rollback_registered(dev); | |
5932 | /* Finish processing unregister after unlock */ | |
5933 | net_set_todo(dev); | |
5934 | } | |
1da177e4 | 5935 | } |
44a0873d | 5936 | EXPORT_SYMBOL(unregister_netdevice_queue); |
1da177e4 | 5937 | |
9b5e383c ED |
5938 | /** |
5939 | * unregister_netdevice_many - unregister many devices | |
5940 | * @head: list of devices | |
9b5e383c ED |
5941 | */ |
5942 | void unregister_netdevice_many(struct list_head *head) | |
5943 | { | |
5944 | struct net_device *dev; | |
5945 | ||
5946 | if (!list_empty(head)) { | |
5947 | rollback_registered_many(head); | |
5948 | list_for_each_entry(dev, head, unreg_list) | |
5949 | net_set_todo(dev); | |
5950 | } | |
5951 | } | |
63c8099d | 5952 | EXPORT_SYMBOL(unregister_netdevice_many); |
9b5e383c | 5953 | |
1da177e4 LT |
5954 | /** |
5955 | * unregister_netdev - remove device from the kernel | |
5956 | * @dev: device | |
5957 | * | |
5958 | * This function shuts down a device interface and removes it | |
d59b54b1 | 5959 | * from the kernel tables. |
1da177e4 LT |
5960 | * |
5961 | * This is just a wrapper for unregister_netdevice that takes | |
5962 | * the rtnl semaphore. In general you want to use this and not | |
5963 | * unregister_netdevice. | |
5964 | */ | |
5965 | void unregister_netdev(struct net_device *dev) | |
5966 | { | |
5967 | rtnl_lock(); | |
5968 | unregister_netdevice(dev); | |
5969 | rtnl_unlock(); | |
5970 | } | |
1da177e4 LT |
5971 | EXPORT_SYMBOL(unregister_netdev); |
5972 | ||
ce286d32 EB |
5973 | /** |
5974 | * dev_change_net_namespace - move device to different nethost namespace | |
5975 | * @dev: device | |
5976 | * @net: network namespace | |
5977 | * @pat: If not NULL name pattern to try if the current device name | |
5978 | * is already taken in the destination network namespace. | |
5979 | * | |
5980 | * This function shuts down a device interface and moves it | |
5981 | * to a new network namespace. On success 0 is returned, on | |
5982 | * a failure a netagive errno code is returned. | |
5983 | * | |
5984 | * Callers must hold the rtnl semaphore. | |
5985 | */ | |
5986 | ||
5987 | int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat) | |
5988 | { | |
ce286d32 EB |
5989 | int err; |
5990 | ||
5991 | ASSERT_RTNL(); | |
5992 | ||
5993 | /* Don't allow namespace local devices to be moved. */ | |
5994 | err = -EINVAL; | |
5995 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
5996 | goto out; | |
5997 | ||
5998 | /* Ensure the device has been registrered */ | |
5999 | err = -EINVAL; | |
6000 | if (dev->reg_state != NETREG_REGISTERED) | |
6001 | goto out; | |
6002 | ||
6003 | /* Get out if there is nothing todo */ | |
6004 | err = 0; | |
878628fb | 6005 | if (net_eq(dev_net(dev), net)) |
ce286d32 EB |
6006 | goto out; |
6007 | ||
6008 | /* Pick the destination device name, and ensure | |
6009 | * we can use it in the destination network namespace. | |
6010 | */ | |
6011 | err = -EEXIST; | |
d9031024 | 6012 | if (__dev_get_by_name(net, dev->name)) { |
ce286d32 EB |
6013 | /* We get here if we can't use the current device name */ |
6014 | if (!pat) | |
6015 | goto out; | |
8ce6cebc | 6016 | if (dev_get_valid_name(dev, pat, 1)) |
ce286d32 EB |
6017 | goto out; |
6018 | } | |
6019 | ||
6020 | /* | |
6021 | * And now a mini version of register_netdevice unregister_netdevice. | |
6022 | */ | |
6023 | ||
6024 | /* If device is running close it first. */ | |
9b772652 | 6025 | dev_close(dev); |
ce286d32 EB |
6026 | |
6027 | /* And unlink it from device chain */ | |
6028 | err = -ENODEV; | |
6029 | unlist_netdevice(dev); | |
6030 | ||
6031 | synchronize_net(); | |
6032 | ||
6033 | /* Shutdown queueing discipline. */ | |
6034 | dev_shutdown(dev); | |
6035 | ||
6036 | /* Notify protocols, that we are about to destroy | |
6037 | this device. They should clean all the things. | |
3b27e105 DL |
6038 | |
6039 | Note that dev->reg_state stays at NETREG_REGISTERED. | |
6040 | This is wanted because this way 8021q and macvlan know | |
6041 | the device is just moving and can keep their slaves up. | |
ce286d32 EB |
6042 | */ |
6043 | call_netdevice_notifiers(NETDEV_UNREGISTER, dev); | |
a5ee1551 | 6044 | call_netdevice_notifiers(NETDEV_UNREGISTER_BATCH, dev); |
ce286d32 EB |
6045 | |
6046 | /* | |
6047 | * Flush the unicast and multicast chains | |
6048 | */ | |
a748ee24 | 6049 | dev_uc_flush(dev); |
22bedad3 | 6050 | dev_mc_flush(dev); |
ce286d32 EB |
6051 | |
6052 | /* Actually switch the network namespace */ | |
c346dca1 | 6053 | dev_net_set(dev, net); |
ce286d32 | 6054 | |
ce286d32 EB |
6055 | /* If there is an ifindex conflict assign a new one */ |
6056 | if (__dev_get_by_index(net, dev->ifindex)) { | |
6057 | int iflink = (dev->iflink == dev->ifindex); | |
6058 | dev->ifindex = dev_new_index(net); | |
6059 | if (iflink) | |
6060 | dev->iflink = dev->ifindex; | |
6061 | } | |
6062 | ||
8b41d188 | 6063 | /* Fixup kobjects */ |
a1b3f594 | 6064 | err = device_rename(&dev->dev, dev->name); |
8b41d188 | 6065 | WARN_ON(err); |
ce286d32 EB |
6066 | |
6067 | /* Add the device back in the hashes */ | |
6068 | list_netdevice(dev); | |
6069 | ||
6070 | /* Notify protocols, that a new device appeared. */ | |
6071 | call_netdevice_notifiers(NETDEV_REGISTER, dev); | |
6072 | ||
d90a909e EB |
6073 | /* |
6074 | * Prevent userspace races by waiting until the network | |
6075 | * device is fully setup before sending notifications. | |
6076 | */ | |
6077 | rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U); | |
6078 | ||
ce286d32 EB |
6079 | synchronize_net(); |
6080 | err = 0; | |
6081 | out: | |
6082 | return err; | |
6083 | } | |
463d0183 | 6084 | EXPORT_SYMBOL_GPL(dev_change_net_namespace); |
ce286d32 | 6085 | |
1da177e4 LT |
6086 | static int dev_cpu_callback(struct notifier_block *nfb, |
6087 | unsigned long action, | |
6088 | void *ocpu) | |
6089 | { | |
6090 | struct sk_buff **list_skb; | |
1da177e4 LT |
6091 | struct sk_buff *skb; |
6092 | unsigned int cpu, oldcpu = (unsigned long)ocpu; | |
6093 | struct softnet_data *sd, *oldsd; | |
6094 | ||
8bb78442 | 6095 | if (action != CPU_DEAD && action != CPU_DEAD_FROZEN) |
1da177e4 LT |
6096 | return NOTIFY_OK; |
6097 | ||
6098 | local_irq_disable(); | |
6099 | cpu = smp_processor_id(); | |
6100 | sd = &per_cpu(softnet_data, cpu); | |
6101 | oldsd = &per_cpu(softnet_data, oldcpu); | |
6102 | ||
6103 | /* Find end of our completion_queue. */ | |
6104 | list_skb = &sd->completion_queue; | |
6105 | while (*list_skb) | |
6106 | list_skb = &(*list_skb)->next; | |
6107 | /* Append completion queue from offline CPU. */ | |
6108 | *list_skb = oldsd->completion_queue; | |
6109 | oldsd->completion_queue = NULL; | |
6110 | ||
1da177e4 | 6111 | /* Append output queue from offline CPU. */ |
a9cbd588 CG |
6112 | if (oldsd->output_queue) { |
6113 | *sd->output_queue_tailp = oldsd->output_queue; | |
6114 | sd->output_queue_tailp = oldsd->output_queue_tailp; | |
6115 | oldsd->output_queue = NULL; | |
6116 | oldsd->output_queue_tailp = &oldsd->output_queue; | |
6117 | } | |
1da177e4 LT |
6118 | |
6119 | raise_softirq_irqoff(NET_TX_SOFTIRQ); | |
6120 | local_irq_enable(); | |
6121 | ||
6122 | /* Process offline CPU's input_pkt_queue */ | |
76cc8b13 | 6123 | while ((skb = __skb_dequeue(&oldsd->process_queue))) { |
1da177e4 | 6124 | netif_rx(skb); |
76cc8b13 | 6125 | input_queue_head_incr(oldsd); |
fec5e652 | 6126 | } |
76cc8b13 | 6127 | while ((skb = __skb_dequeue(&oldsd->input_pkt_queue))) { |
6e7676c1 | 6128 | netif_rx(skb); |
76cc8b13 TH |
6129 | input_queue_head_incr(oldsd); |
6130 | } | |
1da177e4 LT |
6131 | |
6132 | return NOTIFY_OK; | |
6133 | } | |
1da177e4 LT |
6134 | |
6135 | ||
7f353bf2 | 6136 | /** |
b63365a2 HX |
6137 | * netdev_increment_features - increment feature set by one |
6138 | * @all: current feature set | |
6139 | * @one: new feature set | |
6140 | * @mask: mask feature set | |
7f353bf2 HX |
6141 | * |
6142 | * Computes a new feature set after adding a device with feature set | |
b63365a2 HX |
6143 | * @one to the master device with current feature set @all. Will not |
6144 | * enable anything that is off in @mask. Returns the new feature set. | |
7f353bf2 | 6145 | */ |
04ed3e74 | 6146 | u32 netdev_increment_features(u32 all, u32 one, u32 mask) |
b63365a2 HX |
6147 | { |
6148 | /* If device needs checksumming, downgrade to it. */ | |
d1b19dff | 6149 | if (all & NETIF_F_NO_CSUM && !(one & NETIF_F_NO_CSUM)) |
b63365a2 HX |
6150 | all ^= NETIF_F_NO_CSUM | (one & NETIF_F_ALL_CSUM); |
6151 | else if (mask & NETIF_F_ALL_CSUM) { | |
6152 | /* If one device supports v4/v6 checksumming, set for all. */ | |
6153 | if (one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM) && | |
6154 | !(all & NETIF_F_GEN_CSUM)) { | |
6155 | all &= ~NETIF_F_ALL_CSUM; | |
6156 | all |= one & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM); | |
6157 | } | |
e2a6b852 | 6158 | |
b63365a2 HX |
6159 | /* If one device supports hw checksumming, set for all. */ |
6160 | if (one & NETIF_F_GEN_CSUM && !(all & NETIF_F_GEN_CSUM)) { | |
6161 | all &= ~NETIF_F_ALL_CSUM; | |
6162 | all |= NETIF_F_HW_CSUM; | |
6163 | } | |
6164 | } | |
7f353bf2 | 6165 | |
b63365a2 | 6166 | one |= NETIF_F_ALL_CSUM; |
7f353bf2 | 6167 | |
b63365a2 | 6168 | one |= all & NETIF_F_ONE_FOR_ALL; |
d9f5950f | 6169 | all &= one | NETIF_F_LLTX | NETIF_F_GSO | NETIF_F_UFO; |
b63365a2 | 6170 | all |= one & mask & NETIF_F_ONE_FOR_ALL; |
7f353bf2 HX |
6171 | |
6172 | return all; | |
6173 | } | |
b63365a2 | 6174 | EXPORT_SYMBOL(netdev_increment_features); |
7f353bf2 | 6175 | |
30d97d35 PE |
6176 | static struct hlist_head *netdev_create_hash(void) |
6177 | { | |
6178 | int i; | |
6179 | struct hlist_head *hash; | |
6180 | ||
6181 | hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL); | |
6182 | if (hash != NULL) | |
6183 | for (i = 0; i < NETDEV_HASHENTRIES; i++) | |
6184 | INIT_HLIST_HEAD(&hash[i]); | |
6185 | ||
6186 | return hash; | |
6187 | } | |
6188 | ||
881d966b | 6189 | /* Initialize per network namespace state */ |
4665079c | 6190 | static int __net_init netdev_init(struct net *net) |
881d966b | 6191 | { |
881d966b | 6192 | INIT_LIST_HEAD(&net->dev_base_head); |
881d966b | 6193 | |
30d97d35 PE |
6194 | net->dev_name_head = netdev_create_hash(); |
6195 | if (net->dev_name_head == NULL) | |
6196 | goto err_name; | |
881d966b | 6197 | |
30d97d35 PE |
6198 | net->dev_index_head = netdev_create_hash(); |
6199 | if (net->dev_index_head == NULL) | |
6200 | goto err_idx; | |
881d966b EB |
6201 | |
6202 | return 0; | |
30d97d35 PE |
6203 | |
6204 | err_idx: | |
6205 | kfree(net->dev_name_head); | |
6206 | err_name: | |
6207 | return -ENOMEM; | |
881d966b EB |
6208 | } |
6209 | ||
f0db275a SH |
6210 | /** |
6211 | * netdev_drivername - network driver for the device | |
6212 | * @dev: network device | |
6213 | * @buffer: buffer for resulting name | |
6214 | * @len: size of buffer | |
6215 | * | |
6216 | * Determine network driver for device. | |
6217 | */ | |
cf04a4c7 | 6218 | char *netdev_drivername(const struct net_device *dev, char *buffer, int len) |
6579e57b | 6219 | { |
cf04a4c7 SH |
6220 | const struct device_driver *driver; |
6221 | const struct device *parent; | |
6579e57b AV |
6222 | |
6223 | if (len <= 0 || !buffer) | |
6224 | return buffer; | |
6225 | buffer[0] = 0; | |
6226 | ||
6227 | parent = dev->dev.parent; | |
6228 | ||
6229 | if (!parent) | |
6230 | return buffer; | |
6231 | ||
6232 | driver = parent->driver; | |
6233 | if (driver && driver->name) | |
6234 | strlcpy(buffer, driver->name, len); | |
6235 | return buffer; | |
6236 | } | |
6237 | ||
256df2f3 JP |
6238 | static int __netdev_printk(const char *level, const struct net_device *dev, |
6239 | struct va_format *vaf) | |
6240 | { | |
6241 | int r; | |
6242 | ||
6243 | if (dev && dev->dev.parent) | |
6244 | r = dev_printk(level, dev->dev.parent, "%s: %pV", | |
6245 | netdev_name(dev), vaf); | |
6246 | else if (dev) | |
6247 | r = printk("%s%s: %pV", level, netdev_name(dev), vaf); | |
6248 | else | |
6249 | r = printk("%s(NULL net_device): %pV", level, vaf); | |
6250 | ||
6251 | return r; | |
6252 | } | |
6253 | ||
6254 | int netdev_printk(const char *level, const struct net_device *dev, | |
6255 | const char *format, ...) | |
6256 | { | |
6257 | struct va_format vaf; | |
6258 | va_list args; | |
6259 | int r; | |
6260 | ||
6261 | va_start(args, format); | |
6262 | ||
6263 | vaf.fmt = format; | |
6264 | vaf.va = &args; | |
6265 | ||
6266 | r = __netdev_printk(level, dev, &vaf); | |
6267 | va_end(args); | |
6268 | ||
6269 | return r; | |
6270 | } | |
6271 | EXPORT_SYMBOL(netdev_printk); | |
6272 | ||
6273 | #define define_netdev_printk_level(func, level) \ | |
6274 | int func(const struct net_device *dev, const char *fmt, ...) \ | |
6275 | { \ | |
6276 | int r; \ | |
6277 | struct va_format vaf; \ | |
6278 | va_list args; \ | |
6279 | \ | |
6280 | va_start(args, fmt); \ | |
6281 | \ | |
6282 | vaf.fmt = fmt; \ | |
6283 | vaf.va = &args; \ | |
6284 | \ | |
6285 | r = __netdev_printk(level, dev, &vaf); \ | |
6286 | va_end(args); \ | |
6287 | \ | |
6288 | return r; \ | |
6289 | } \ | |
6290 | EXPORT_SYMBOL(func); | |
6291 | ||
6292 | define_netdev_printk_level(netdev_emerg, KERN_EMERG); | |
6293 | define_netdev_printk_level(netdev_alert, KERN_ALERT); | |
6294 | define_netdev_printk_level(netdev_crit, KERN_CRIT); | |
6295 | define_netdev_printk_level(netdev_err, KERN_ERR); | |
6296 | define_netdev_printk_level(netdev_warn, KERN_WARNING); | |
6297 | define_netdev_printk_level(netdev_notice, KERN_NOTICE); | |
6298 | define_netdev_printk_level(netdev_info, KERN_INFO); | |
6299 | ||
4665079c | 6300 | static void __net_exit netdev_exit(struct net *net) |
881d966b EB |
6301 | { |
6302 | kfree(net->dev_name_head); | |
6303 | kfree(net->dev_index_head); | |
6304 | } | |
6305 | ||
022cbae6 | 6306 | static struct pernet_operations __net_initdata netdev_net_ops = { |
881d966b EB |
6307 | .init = netdev_init, |
6308 | .exit = netdev_exit, | |
6309 | }; | |
6310 | ||
4665079c | 6311 | static void __net_exit default_device_exit(struct net *net) |
ce286d32 | 6312 | { |
e008b5fc | 6313 | struct net_device *dev, *aux; |
ce286d32 | 6314 | /* |
e008b5fc | 6315 | * Push all migratable network devices back to the |
ce286d32 EB |
6316 | * initial network namespace |
6317 | */ | |
6318 | rtnl_lock(); | |
e008b5fc | 6319 | for_each_netdev_safe(net, dev, aux) { |
ce286d32 | 6320 | int err; |
aca51397 | 6321 | char fb_name[IFNAMSIZ]; |
ce286d32 EB |
6322 | |
6323 | /* Ignore unmoveable devices (i.e. loopback) */ | |
6324 | if (dev->features & NETIF_F_NETNS_LOCAL) | |
6325 | continue; | |
6326 | ||
e008b5fc EB |
6327 | /* Leave virtual devices for the generic cleanup */ |
6328 | if (dev->rtnl_link_ops) | |
6329 | continue; | |
d0c082ce | 6330 | |
ce286d32 | 6331 | /* Push remaing network devices to init_net */ |
aca51397 PE |
6332 | snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex); |
6333 | err = dev_change_net_namespace(dev, &init_net, fb_name); | |
ce286d32 | 6334 | if (err) { |
aca51397 | 6335 | printk(KERN_EMERG "%s: failed to move %s to init_net: %d\n", |
ce286d32 | 6336 | __func__, dev->name, err); |
aca51397 | 6337 | BUG(); |
ce286d32 EB |
6338 | } |
6339 | } | |
6340 | rtnl_unlock(); | |
6341 | } | |
6342 | ||
04dc7f6b EB |
6343 | static void __net_exit default_device_exit_batch(struct list_head *net_list) |
6344 | { | |
6345 | /* At exit all network devices most be removed from a network | |
b595076a | 6346 | * namespace. Do this in the reverse order of registration. |
04dc7f6b EB |
6347 | * Do this across as many network namespaces as possible to |
6348 | * improve batching efficiency. | |
6349 | */ | |
6350 | struct net_device *dev; | |
6351 | struct net *net; | |
6352 | LIST_HEAD(dev_kill_list); | |
6353 | ||
6354 | rtnl_lock(); | |
6355 | list_for_each_entry(net, net_list, exit_list) { | |
6356 | for_each_netdev_reverse(net, dev) { | |
6357 | if (dev->rtnl_link_ops) | |
6358 | dev->rtnl_link_ops->dellink(dev, &dev_kill_list); | |
6359 | else | |
6360 | unregister_netdevice_queue(dev, &dev_kill_list); | |
6361 | } | |
6362 | } | |
6363 | unregister_netdevice_many(&dev_kill_list); | |
6364 | rtnl_unlock(); | |
6365 | } | |
6366 | ||
022cbae6 | 6367 | static struct pernet_operations __net_initdata default_device_ops = { |
ce286d32 | 6368 | .exit = default_device_exit, |
04dc7f6b | 6369 | .exit_batch = default_device_exit_batch, |
ce286d32 EB |
6370 | }; |
6371 | ||
1da177e4 LT |
6372 | /* |
6373 | * Initialize the DEV module. At boot time this walks the device list and | |
6374 | * unhooks any devices that fail to initialise (normally hardware not | |
6375 | * present) and leaves us with a valid list of present and active devices. | |
6376 | * | |
6377 | */ | |
6378 | ||
6379 | /* | |
6380 | * This is called single threaded during boot, so no need | |
6381 | * to take the rtnl semaphore. | |
6382 | */ | |
6383 | static int __init net_dev_init(void) | |
6384 | { | |
6385 | int i, rc = -ENOMEM; | |
6386 | ||
6387 | BUG_ON(!dev_boot_phase); | |
6388 | ||
1da177e4 LT |
6389 | if (dev_proc_init()) |
6390 | goto out; | |
6391 | ||
8b41d188 | 6392 | if (netdev_kobject_init()) |
1da177e4 LT |
6393 | goto out; |
6394 | ||
6395 | INIT_LIST_HEAD(&ptype_all); | |
82d8a867 | 6396 | for (i = 0; i < PTYPE_HASH_SIZE; i++) |
1da177e4 LT |
6397 | INIT_LIST_HEAD(&ptype_base[i]); |
6398 | ||
881d966b EB |
6399 | if (register_pernet_subsys(&netdev_net_ops)) |
6400 | goto out; | |
1da177e4 LT |
6401 | |
6402 | /* | |
6403 | * Initialise the packet receive queues. | |
6404 | */ | |
6405 | ||
6f912042 | 6406 | for_each_possible_cpu(i) { |
e36fa2f7 | 6407 | struct softnet_data *sd = &per_cpu(softnet_data, i); |
1da177e4 | 6408 | |
dee42870 | 6409 | memset(sd, 0, sizeof(*sd)); |
e36fa2f7 | 6410 | skb_queue_head_init(&sd->input_pkt_queue); |
6e7676c1 | 6411 | skb_queue_head_init(&sd->process_queue); |
e36fa2f7 ED |
6412 | sd->completion_queue = NULL; |
6413 | INIT_LIST_HEAD(&sd->poll_list); | |
a9cbd588 CG |
6414 | sd->output_queue = NULL; |
6415 | sd->output_queue_tailp = &sd->output_queue; | |
df334545 | 6416 | #ifdef CONFIG_RPS |
e36fa2f7 ED |
6417 | sd->csd.func = rps_trigger_softirq; |
6418 | sd->csd.info = sd; | |
6419 | sd->csd.flags = 0; | |
6420 | sd->cpu = i; | |
1e94d72f | 6421 | #endif |
0a9627f2 | 6422 | |
e36fa2f7 ED |
6423 | sd->backlog.poll = process_backlog; |
6424 | sd->backlog.weight = weight_p; | |
6425 | sd->backlog.gro_list = NULL; | |
6426 | sd->backlog.gro_count = 0; | |
1da177e4 LT |
6427 | } |
6428 | ||
1da177e4 LT |
6429 | dev_boot_phase = 0; |
6430 | ||
505d4f73 EB |
6431 | /* The loopback device is special if any other network devices |
6432 | * is present in a network namespace the loopback device must | |
6433 | * be present. Since we now dynamically allocate and free the | |
6434 | * loopback device ensure this invariant is maintained by | |
6435 | * keeping the loopback device as the first device on the | |
6436 | * list of network devices. Ensuring the loopback devices | |
6437 | * is the first device that appears and the last network device | |
6438 | * that disappears. | |
6439 | */ | |
6440 | if (register_pernet_device(&loopback_net_ops)) | |
6441 | goto out; | |
6442 | ||
6443 | if (register_pernet_device(&default_device_ops)) | |
6444 | goto out; | |
6445 | ||
962cf36c CM |
6446 | open_softirq(NET_TX_SOFTIRQ, net_tx_action); |
6447 | open_softirq(NET_RX_SOFTIRQ, net_rx_action); | |
1da177e4 LT |
6448 | |
6449 | hotcpu_notifier(dev_cpu_callback, 0); | |
6450 | dst_init(); | |
6451 | dev_mcast_init(); | |
6452 | rc = 0; | |
6453 | out: | |
6454 | return rc; | |
6455 | } | |
6456 | ||
6457 | subsys_initcall(net_dev_init); | |
6458 | ||
e88721f8 KK |
6459 | static int __init initialize_hashrnd(void) |
6460 | { | |
0a9627f2 | 6461 | get_random_bytes(&hashrnd, sizeof(hashrnd)); |
e88721f8 KK |
6462 | return 0; |
6463 | } | |
6464 | ||
6465 | late_initcall_sync(initialize_hashrnd); | |
6466 |