Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
20d29d7a | 2 | #include <linux/etherdevice.h> |
6fe3faf8 | 3 | #include <linux/if_tap.h> |
f09e2249 | 4 | #include <linux/if_vlan.h> |
20d29d7a AB |
5 | #include <linux/interrupt.h> |
6 | #include <linux/nsproxy.h> | |
7 | #include <linux/compat.h> | |
8 | #include <linux/if_tun.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/skbuff.h> | |
11 | #include <linux/cache.h> | |
c3edc401 | 12 | #include <linux/sched/signal.h> |
20d29d7a | 13 | #include <linux/types.h> |
5a0e3ad6 | 14 | #include <linux/slab.h> |
20d29d7a AB |
15 | #include <linux/wait.h> |
16 | #include <linux/cdev.h> | |
40401530 | 17 | #include <linux/idr.h> |
20d29d7a | 18 | #include <linux/fs.h> |
6c36d2e2 | 19 | #include <linux/uio.h> |
20d29d7a | 20 | |
d457a0e3 | 21 | #include <net/gso.h> |
20d29d7a AB |
22 | #include <net/net_namespace.h> |
23 | #include <net/rtnetlink.h> | |
24 | #include <net/sock.h> | |
92272ec4 | 25 | #include <net/xdp.h> |
b9fb9ee0 | 26 | #include <linux/virtio_net.h> |
362899b8 | 27 | #include <linux/skb_array.h> |
20d29d7a | 28 | |
635b8c8e | 29 | #define TAP_IFFEATURES (IFF_VNET_HDR | IFF_MULTI_QUEUE) |
01b07fb3 | 30 | |
635b8c8e SG |
31 | #define TAP_VNET_LE 0x80000000 |
32 | #define TAP_VNET_BE 0x40000000 | |
8b8e658b GK |
33 | |
34 | #ifdef CONFIG_TUN_VNET_CROSS_LE | |
635b8c8e | 35 | static inline bool tap_legacy_is_little_endian(struct tap_queue *q) |
8b8e658b | 36 | { |
635b8c8e | 37 | return q->flags & TAP_VNET_BE ? false : |
8b8e658b GK |
38 | virtio_legacy_is_little_endian(); |
39 | } | |
40 | ||
635b8c8e | 41 | static long tap_get_vnet_be(struct tap_queue *q, int __user *sp) |
8b8e658b | 42 | { |
635b8c8e | 43 | int s = !!(q->flags & TAP_VNET_BE); |
8b8e658b GK |
44 | |
45 | if (put_user(s, sp)) | |
46 | return -EFAULT; | |
47 | ||
48 | return 0; | |
49 | } | |
50 | ||
635b8c8e | 51 | static long tap_set_vnet_be(struct tap_queue *q, int __user *sp) |
8b8e658b GK |
52 | { |
53 | int s; | |
54 | ||
55 | if (get_user(s, sp)) | |
56 | return -EFAULT; | |
57 | ||
58 | if (s) | |
635b8c8e | 59 | q->flags |= TAP_VNET_BE; |
8b8e658b | 60 | else |
635b8c8e | 61 | q->flags &= ~TAP_VNET_BE; |
8b8e658b GK |
62 | |
63 | return 0; | |
64 | } | |
65 | #else | |
635b8c8e | 66 | static inline bool tap_legacy_is_little_endian(struct tap_queue *q) |
8b8e658b GK |
67 | { |
68 | return virtio_legacy_is_little_endian(); | |
69 | } | |
70 | ||
635b8c8e | 71 | static long tap_get_vnet_be(struct tap_queue *q, int __user *argp) |
8b8e658b GK |
72 | { |
73 | return -EINVAL; | |
74 | } | |
75 | ||
635b8c8e | 76 | static long tap_set_vnet_be(struct tap_queue *q, int __user *argp) |
8b8e658b GK |
77 | { |
78 | return -EINVAL; | |
79 | } | |
80 | #endif /* CONFIG_TUN_VNET_CROSS_LE */ | |
6ae7feb3 | 81 | |
635b8c8e | 82 | static inline bool tap_is_little_endian(struct tap_queue *q) |
5b11e15f | 83 | { |
635b8c8e SG |
84 | return q->flags & TAP_VNET_LE || |
85 | tap_legacy_is_little_endian(q); | |
5b11e15f | 86 | } |
6ae7feb3 | 87 | |
635b8c8e | 88 | static inline u16 tap16_to_cpu(struct tap_queue *q, __virtio16 val) |
6ae7feb3 | 89 | { |
635b8c8e | 90 | return __virtio16_to_cpu(tap_is_little_endian(q), val); |
6ae7feb3 MT |
91 | } |
92 | ||
635b8c8e | 93 | static inline __virtio16 cpu_to_tap16(struct tap_queue *q, u16 val) |
6ae7feb3 | 94 | { |
635b8c8e | 95 | return __cpu_to_virtio16(tap_is_little_endian(q), val); |
6ae7feb3 MT |
96 | } |
97 | ||
635b8c8e SG |
98 | static struct proto tap_proto = { |
99 | .name = "tap", | |
20d29d7a | 100 | .owner = THIS_MODULE, |
635b8c8e | 101 | .obj_size = sizeof(struct tap_queue), |
20d29d7a AB |
102 | }; |
103 | ||
635b8c8e | 104 | #define TAP_NUM_DEVS (1U << MINORBITS) |
d9f1f61c SG |
105 | |
106 | static LIST_HEAD(major_list); | |
107 | ||
ebc05ba7 | 108 | struct major_info { |
d9f1f61c | 109 | struct rcu_head rcu; |
ebc05ba7 SG |
110 | dev_t major; |
111 | struct idr minor_idr; | |
ffa423fb | 112 | spinlock_t minor_lock; |
ebc05ba7 | 113 | const char *device_name; |
d9f1f61c SG |
114 | struct list_head next; |
115 | }; | |
e09eff7f | 116 | |
97bc3633 | 117 | #define GOODCOPY_LEN 128 |
20d29d7a | 118 | |
635b8c8e | 119 | static const struct proto_ops tap_socket_ops; |
501c774c | 120 | |
2be5c767 | 121 | #define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO) |
f23d538b | 122 | #define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG | NETIF_F_FRAGLIST) |
a567dd62 | 123 | |
6fe3faf8 | 124 | static struct tap_dev *tap_dev_get_rcu(const struct net_device *dev) |
6acf54f1 VY |
125 | { |
126 | return rcu_dereference(dev->rx_handler_data); | |
127 | } | |
128 | ||
20d29d7a AB |
129 | /* |
130 | * RCU usage: | |
635b8c8e | 131 | * The tap_queue and the macvlan_dev are loosely coupled, the |
02df55d2 | 132 | * pointers from one to the other can only be read while rcu_read_lock |
441ac0fc | 133 | * or rtnl is held. |
20d29d7a | 134 | * |
635b8c8e | 135 | * Both the file and the macvlan_dev hold a reference on the tap_queue |
02df55d2 AB |
136 | * through sock_hold(&q->sk). When the macvlan_dev goes away first, |
137 | * q->vlan becomes inaccessible. When the files gets closed, | |
635b8c8e | 138 | * tap_get_queue() fails. |
20d29d7a | 139 | * |
02df55d2 AB |
140 | * There may still be references to the struct sock inside of the |
141 | * queue from outbound SKBs, but these never reference back to the | |
142 | * file or the dev. The data structure is freed through __sk_free | |
143 | * when both our references and any pending SKBs are gone. | |
20d29d7a | 144 | */ |
20d29d7a | 145 | |
6fe3faf8 | 146 | static int tap_enable_queue(struct tap_dev *tap, struct file *file, |
635b8c8e | 147 | struct tap_queue *q) |
815f236d | 148 | { |
815f236d JW |
149 | int err = -EINVAL; |
150 | ||
441ac0fc | 151 | ASSERT_RTNL(); |
815f236d JW |
152 | |
153 | if (q->enabled) | |
154 | goto out; | |
155 | ||
156 | err = 0; | |
6fe3faf8 SG |
157 | rcu_assign_pointer(tap->taps[tap->numvtaps], q); |
158 | q->queue_index = tap->numvtaps; | |
815f236d JW |
159 | q->enabled = true; |
160 | ||
6fe3faf8 | 161 | tap->numvtaps++; |
815f236d | 162 | out: |
815f236d JW |
163 | return err; |
164 | } | |
165 | ||
40b8fe45 | 166 | /* Requires RTNL */ |
6fe3faf8 | 167 | static int tap_set_queue(struct tap_dev *tap, struct file *file, |
635b8c8e | 168 | struct tap_queue *q) |
20d29d7a | 169 | { |
6fe3faf8 | 170 | if (tap->numqueues == MAX_TAP_QUEUES) |
40b8fe45 | 171 | return -EBUSY; |
20d29d7a | 172 | |
6fe3faf8 SG |
173 | rcu_assign_pointer(q->tap, tap); |
174 | rcu_assign_pointer(tap->taps[tap->numvtaps], q); | |
02df55d2 | 175 | sock_hold(&q->sk); |
20d29d7a AB |
176 | |
177 | q->file = file; | |
6fe3faf8 | 178 | q->queue_index = tap->numvtaps; |
815f236d | 179 | q->enabled = true; |
02df55d2 | 180 | file->private_data = q; |
6fe3faf8 | 181 | list_add_tail(&q->next, &tap->queue_list); |
20d29d7a | 182 | |
6fe3faf8 SG |
183 | tap->numvtaps++; |
184 | tap->numqueues++; | |
1565c7c1 | 185 | |
40b8fe45 | 186 | return 0; |
20d29d7a AB |
187 | } |
188 | ||
635b8c8e | 189 | static int tap_disable_queue(struct tap_queue *q) |
815f236d | 190 | { |
6fe3faf8 | 191 | struct tap_dev *tap; |
635b8c8e | 192 | struct tap_queue *nq; |
815f236d | 193 | |
441ac0fc | 194 | ASSERT_RTNL(); |
815f236d JW |
195 | if (!q->enabled) |
196 | return -EINVAL; | |
197 | ||
6fe3faf8 | 198 | tap = rtnl_dereference(q->tap); |
441ac0fc | 199 | |
6fe3faf8 | 200 | if (tap) { |
815f236d | 201 | int index = q->queue_index; |
6fe3faf8 SG |
202 | BUG_ON(index >= tap->numvtaps); |
203 | nq = rtnl_dereference(tap->taps[tap->numvtaps - 1]); | |
815f236d JW |
204 | nq->queue_index = index; |
205 | ||
6fe3faf8 SG |
206 | rcu_assign_pointer(tap->taps[index], nq); |
207 | RCU_INIT_POINTER(tap->taps[tap->numvtaps - 1], NULL); | |
815f236d JW |
208 | q->enabled = false; |
209 | ||
6fe3faf8 | 210 | tap->numvtaps--; |
815f236d JW |
211 | } |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
20d29d7a | 216 | /* |
02df55d2 AB |
217 | * The file owning the queue got closed, give up both |
218 | * the reference that the files holds as well as the | |
219 | * one from the macvlan_dev if that still exists. | |
20d29d7a AB |
220 | * |
221 | * Using the spinlock makes sure that we don't get | |
222 | * to the queue again after destroying it. | |
20d29d7a | 223 | */ |
635b8c8e | 224 | static void tap_put_queue(struct tap_queue *q) |
20d29d7a | 225 | { |
6fe3faf8 | 226 | struct tap_dev *tap; |
20d29d7a | 227 | |
441ac0fc | 228 | rtnl_lock(); |
6fe3faf8 | 229 | tap = rtnl_dereference(q->tap); |
441ac0fc | 230 | |
6fe3faf8 | 231 | if (tap) { |
815f236d | 232 | if (q->enabled) |
635b8c8e | 233 | BUG_ON(tap_disable_queue(q)); |
376b1aab | 234 | |
6fe3faf8 SG |
235 | tap->numqueues--; |
236 | RCU_INIT_POINTER(q->tap, NULL); | |
02df55d2 | 237 | sock_put(&q->sk); |
815f236d | 238 | list_del_init(&q->next); |
20d29d7a AB |
239 | } |
240 | ||
441ac0fc | 241 | rtnl_unlock(); |
20d29d7a AB |
242 | |
243 | synchronize_rcu(); | |
244 | sock_put(&q->sk); | |
245 | } | |
246 | ||
247 | /* | |
1565c7c1 KK |
248 | * Select a queue based on the rxq of the device on which this packet |
249 | * arrived. If the incoming device is not mq, calculate a flow hash | |
250 | * to select a queue. If all fails, find the first available queue. | |
251 | * Cache vlan->numvtaps since it can become zero during the execution | |
252 | * of this function. | |
20d29d7a | 253 | */ |
6fe3faf8 | 254 | static struct tap_queue *tap_get_queue(struct tap_dev *tap, |
635b8c8e | 255 | struct sk_buff *skb) |
20d29d7a | 256 | { |
6fe3faf8 | 257 | struct tap_queue *queue = NULL; |
815f236d JW |
258 | /* Access to taps array is protected by rcu, but access to numvtaps |
259 | * isn't. Below we use it to lookup a queue, but treat it as a hint | |
260 | * and validate that the result isn't NULL - in case we are | |
261 | * racing against queue removal. | |
262 | */ | |
6aa7de05 | 263 | int numvtaps = READ_ONCE(tap->numvtaps); |
1565c7c1 KK |
264 | __u32 rxq; |
265 | ||
266 | if (!numvtaps) | |
267 | goto out; | |
268 | ||
1b16bf42 JW |
269 | if (numvtaps == 1) |
270 | goto single; | |
271 | ||
ef0002b5 | 272 | /* Check if we can use flow to select a queue */ |
3958afa1 | 273 | rxq = skb_get_hash(skb); |
ef0002b5 | 274 | if (rxq) { |
6fe3faf8 | 275 | queue = rcu_dereference(tap->taps[rxq % numvtaps]); |
376b1aab | 276 | goto out; |
ef0002b5 KK |
277 | } |
278 | ||
1565c7c1 KK |
279 | if (likely(skb_rx_queue_recorded(skb))) { |
280 | rxq = skb_get_rx_queue(skb); | |
20d29d7a | 281 | |
1565c7c1 KK |
282 | while (unlikely(rxq >= numvtaps)) |
283 | rxq -= numvtaps; | |
284 | ||
6fe3faf8 | 285 | queue = rcu_dereference(tap->taps[rxq]); |
376b1aab | 286 | goto out; |
1565c7c1 KK |
287 | } |
288 | ||
1b16bf42 | 289 | single: |
6fe3faf8 | 290 | queue = rcu_dereference(tap->taps[0]); |
1565c7c1 | 291 | out: |
6fe3faf8 | 292 | return queue; |
20d29d7a AB |
293 | } |
294 | ||
02df55d2 AB |
295 | /* |
296 | * The net_device is going away, give up the reference | |
1565c7c1 KK |
297 | * that it holds on all queues and safely set the pointer |
298 | * from the queues to NULL. | |
02df55d2 | 299 | */ |
6fe3faf8 | 300 | void tap_del_queues(struct tap_dev *tap) |
20d29d7a | 301 | { |
635b8c8e | 302 | struct tap_queue *q, *tmp; |
02df55d2 | 303 | |
441ac0fc | 304 | ASSERT_RTNL(); |
6fe3faf8 | 305 | list_for_each_entry_safe(q, tmp, &tap->queue_list, next) { |
815f236d | 306 | list_del_init(&q->next); |
6fe3faf8 | 307 | RCU_INIT_POINTER(q->tap, NULL); |
815f236d | 308 | if (q->enabled) |
6fe3faf8 SG |
309 | tap->numvtaps--; |
310 | tap->numqueues--; | |
dfe816c5 | 311 | sock_put(&q->sk); |
564517e8 | 312 | } |
6fe3faf8 SG |
313 | BUG_ON(tap->numvtaps); |
314 | BUG_ON(tap->numqueues); | |
635b8c8e | 315 | /* guarantee that any future tap_set_queue will fail */ |
6fe3faf8 | 316 | tap->numvtaps = MAX_TAP_QUEUES; |
20d29d7a | 317 | } |
9a393b5d | 318 | EXPORT_SYMBOL_GPL(tap_del_queues); |
20d29d7a | 319 | |
635b8c8e | 320 | rx_handler_result_t tap_handle_frame(struct sk_buff **pskb) |
20d29d7a | 321 | { |
6acf54f1 VY |
322 | struct sk_buff *skb = *pskb; |
323 | struct net_device *dev = skb->dev; | |
6fe3faf8 | 324 | struct tap_dev *tap; |
635b8c8e | 325 | struct tap_queue *q; |
a567dd62 | 326 | netdev_features_t features = TAP_FEATURES; |
736f16de | 327 | enum skb_drop_reason drop_reason; |
a567dd62 | 328 | |
6fe3faf8 SG |
329 | tap = tap_dev_get_rcu(dev); |
330 | if (!tap) | |
6acf54f1 VY |
331 | return RX_HANDLER_PASS; |
332 | ||
6fe3faf8 | 333 | q = tap_get_queue(tap, skb); |
20d29d7a | 334 | if (!q) |
6acf54f1 | 335 | return RX_HANDLER_PASS; |
8a35747a | 336 | |
6acf54f1 VY |
337 | skb_push(skb, ETH_HLEN); |
338 | ||
3e4f8b78 | 339 | /* Apply the forward feature mask so that we perform segmentation |
e5733321 VY |
340 | * according to users wishes. This only works if VNET_HDR is |
341 | * enabled. | |
3e4f8b78 | 342 | */ |
e5733321 | 343 | if (q->flags & IFF_VNET_HDR) |
6fe3faf8 | 344 | features |= tap->tap_features; |
8b86a61d | 345 | if (netif_needs_gso(skb, features)) { |
3e4f8b78 | 346 | struct sk_buff *segs = __skb_gso_segment(skb, features, false); |
5643a552 | 347 | struct sk_buff *next; |
3e4f8b78 | 348 | |
736f16de DZ |
349 | if (IS_ERR(segs)) { |
350 | drop_reason = SKB_DROP_REASON_SKB_GSO_SEG; | |
3e4f8b78 | 351 | goto drop; |
736f16de | 352 | } |
3e4f8b78 VY |
353 | |
354 | if (!segs) { | |
736f16de DZ |
355 | if (ptr_ring_produce(&q->ring, skb)) { |
356 | drop_reason = SKB_DROP_REASON_FULL_RING; | |
362899b8 | 357 | goto drop; |
736f16de | 358 | } |
3e4f8b78 VY |
359 | goto wake_up; |
360 | } | |
361 | ||
be0bd316 | 362 | consume_skb(skb); |
5643a552 JD |
363 | skb_list_walk_safe(segs, skb, next) { |
364 | skb_mark_not_on_list(skb); | |
365 | if (ptr_ring_produce(&q->ring, skb)) { | |
736f16de DZ |
366 | drop_reason = SKB_DROP_REASON_FULL_RING; |
367 | kfree_skb_reason(skb, drop_reason); | |
368 | kfree_skb_list_reason(next, drop_reason); | |
362899b8 JW |
369 | break; |
370 | } | |
3e4f8b78 VY |
371 | } |
372 | } else { | |
cbdb0427 VY |
373 | /* If we receive a partial checksum and the tap side |
374 | * doesn't support checksum offload, compute the checksum. | |
375 | * Note: it doesn't matter which checksum feature to | |
a8e04698 | 376 | * check, we either support them all or none. |
cbdb0427 VY |
377 | */ |
378 | if (skb->ip_summed == CHECKSUM_PARTIAL && | |
a188222b | 379 | !(features & NETIF_F_CSUM_MASK) && |
736f16de DZ |
380 | skb_checksum_help(skb)) { |
381 | drop_reason = SKB_DROP_REASON_SKB_CSUM; | |
cbdb0427 | 382 | goto drop; |
736f16de DZ |
383 | } |
384 | if (ptr_ring_produce(&q->ring, skb)) { | |
385 | drop_reason = SKB_DROP_REASON_FULL_RING; | |
362899b8 | 386 | goto drop; |
736f16de | 387 | } |
3e4f8b78 VY |
388 | } |
389 | ||
390 | wake_up: | |
a9a08845 | 391 | wake_up_interruptible_poll(sk_sleep(&q->sk), EPOLLIN | EPOLLRDNORM | EPOLLRDBAND); |
6acf54f1 | 392 | return RX_HANDLER_CONSUMED; |
8a35747a HX |
393 | |
394 | drop: | |
6acf54f1 | 395 | /* Count errors/drops only here, thus don't care about args. */ |
6fe3faf8 SG |
396 | if (tap->count_rx_dropped) |
397 | tap->count_rx_dropped(tap); | |
736f16de | 398 | kfree_skb_reason(skb, drop_reason); |
6acf54f1 | 399 | return RX_HANDLER_CONSUMED; |
20d29d7a | 400 | } |
9a393b5d | 401 | EXPORT_SYMBOL_GPL(tap_handle_frame); |
20d29d7a | 402 | |
d9f1f61c SG |
403 | static struct major_info *tap_get_major(int major) |
404 | { | |
405 | struct major_info *tap_major; | |
406 | ||
407 | list_for_each_entry_rcu(tap_major, &major_list, next) { | |
408 | if (tap_major->major == major) | |
409 | return tap_major; | |
410 | } | |
411 | ||
412 | return NULL; | |
413 | } | |
414 | ||
415 | int tap_get_minor(dev_t major, struct tap_dev *tap) | |
e09eff7f EB |
416 | { |
417 | int retval = -ENOMEM; | |
d9f1f61c SG |
418 | struct major_info *tap_major; |
419 | ||
420 | rcu_read_lock(); | |
421 | tap_major = tap_get_major(MAJOR(major)); | |
422 | if (!tap_major) { | |
423 | retval = -EINVAL; | |
424 | goto unlock; | |
425 | } | |
e09eff7f | 426 | |
ffa423fb WC |
427 | spin_lock(&tap_major->minor_lock); |
428 | retval = idr_alloc(&tap_major->minor_idr, tap, 1, TAP_NUM_DEVS, GFP_ATOMIC); | |
ec09ebc1 | 429 | if (retval >= 0) { |
6fe3faf8 | 430 | tap->minor = retval; |
ec09ebc1 | 431 | } else if (retval == -ENOSPC) { |
6fe3faf8 | 432 | netdev_err(tap->dev, "Too many tap devices\n"); |
e09eff7f | 433 | retval = -EINVAL; |
e09eff7f | 434 | } |
ffa423fb | 435 | spin_unlock(&tap_major->minor_lock); |
d9f1f61c SG |
436 | |
437 | unlock: | |
438 | rcu_read_unlock(); | |
ec09ebc1 | 439 | return retval < 0 ? retval : 0; |
e09eff7f | 440 | } |
9a393b5d | 441 | EXPORT_SYMBOL_GPL(tap_get_minor); |
e09eff7f | 442 | |
d9f1f61c | 443 | void tap_free_minor(dev_t major, struct tap_dev *tap) |
e09eff7f | 444 | { |
d9f1f61c SG |
445 | struct major_info *tap_major; |
446 | ||
447 | rcu_read_lock(); | |
448 | tap_major = tap_get_major(MAJOR(major)); | |
449 | if (!tap_major) { | |
450 | goto unlock; | |
451 | } | |
452 | ||
ffa423fb | 453 | spin_lock(&tap_major->minor_lock); |
6fe3faf8 | 454 | if (tap->minor) { |
d9f1f61c | 455 | idr_remove(&tap_major->minor_idr, tap->minor); |
6fe3faf8 | 456 | tap->minor = 0; |
e09eff7f | 457 | } |
ffa423fb | 458 | spin_unlock(&tap_major->minor_lock); |
d9f1f61c SG |
459 | |
460 | unlock: | |
461 | rcu_read_unlock(); | |
e09eff7f | 462 | } |
9a393b5d | 463 | EXPORT_SYMBOL_GPL(tap_free_minor); |
e09eff7f | 464 | |
d9f1f61c | 465 | static struct tap_dev *dev_get_by_tap_file(int major, int minor) |
e09eff7f EB |
466 | { |
467 | struct net_device *dev = NULL; | |
6fe3faf8 | 468 | struct tap_dev *tap; |
d9f1f61c | 469 | struct major_info *tap_major; |
e09eff7f | 470 | |
d9f1f61c SG |
471 | rcu_read_lock(); |
472 | tap_major = tap_get_major(major); | |
473 | if (!tap_major) { | |
474 | tap = NULL; | |
475 | goto unlock; | |
476 | } | |
477 | ||
ffa423fb | 478 | spin_lock(&tap_major->minor_lock); |
d9f1f61c | 479 | tap = idr_find(&tap_major->minor_idr, minor); |
6fe3faf8 SG |
480 | if (tap) { |
481 | dev = tap->dev; | |
e09eff7f EB |
482 | dev_hold(dev); |
483 | } | |
ffa423fb | 484 | spin_unlock(&tap_major->minor_lock); |
d9f1f61c SG |
485 | |
486 | unlock: | |
487 | rcu_read_unlock(); | |
6fe3faf8 | 488 | return tap; |
e09eff7f EB |
489 | } |
490 | ||
635b8c8e | 491 | static void tap_sock_write_space(struct sock *sk) |
20d29d7a | 492 | { |
43815482 ED |
493 | wait_queue_head_t *wqueue; |
494 | ||
20d29d7a | 495 | if (!sock_writeable(sk) || |
9cd3e072 | 496 | !test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
20d29d7a AB |
497 | return; |
498 | ||
43815482 ED |
499 | wqueue = sk_sleep(sk); |
500 | if (wqueue && waitqueue_active(wqueue)) | |
a9a08845 | 501 | wake_up_interruptible_poll(wqueue, EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND); |
20d29d7a AB |
502 | } |
503 | ||
635b8c8e | 504 | static void tap_sock_destruct(struct sock *sk) |
2259fef0 | 505 | { |
635b8c8e | 506 | struct tap_queue *q = container_of(sk, struct tap_queue, sk); |
362899b8 | 507 | |
5990a305 | 508 | ptr_ring_cleanup(&q->ring, __skb_array_destroy_skb); |
2259fef0 EB |
509 | } |
510 | ||
635b8c8e | 511 | static int tap_open(struct inode *inode, struct file *file) |
20d29d7a AB |
512 | { |
513 | struct net *net = current->nsproxy->net_ns; | |
6fe3faf8 | 514 | struct tap_dev *tap; |
635b8c8e | 515 | struct tap_queue *q; |
40b8fe45 | 516 | int err = -ENODEV; |
20d29d7a | 517 | |
40b8fe45 | 518 | rtnl_lock(); |
d9f1f61c | 519 | tap = dev_get_by_tap_file(imajor(inode), iminor(inode)); |
6fe3faf8 | 520 | if (!tap) |
362899b8 | 521 | goto err; |
20d29d7a | 522 | |
20d29d7a | 523 | err = -ENOMEM; |
635b8c8e SG |
524 | q = (struct tap_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, |
525 | &tap_proto, 0); | |
20d29d7a | 526 | if (!q) |
362899b8 | 527 | goto err; |
5990a305 | 528 | if (ptr_ring_init(&q->ring, tap->dev->tx_queue_len, GFP_KERNEL)) { |
78e0ea67 GM |
529 | sk_free(&q->sk); |
530 | goto err; | |
531 | } | |
20d29d7a | 532 | |
333f7909 | 533 | init_waitqueue_head(&q->sock.wq.wait); |
20d29d7a AB |
534 | q->sock.type = SOCK_RAW; |
535 | q->sock.state = SS_CONNECTED; | |
501c774c | 536 | q->sock.file = file; |
635b8c8e | 537 | q->sock.ops = &tap_socket_ops; |
5c9241f3 | 538 | sock_init_data_uid(&q->sock, &q->sk, current_fsuid()); |
635b8c8e SG |
539 | q->sk.sk_write_space = tap_sock_write_space; |
540 | q->sk.sk_destruct = tap_sock_destruct; | |
b9fb9ee0 | 541 | q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP; |
55afbd08 | 542 | q->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
20d29d7a | 543 | |
97bc3633 | 544 | /* |
635b8c8e | 545 | * so far only KVM virtio_net uses tap, enable zero copy between |
97bc3633 | 546 | * guest kernel and host kernel when lower device supports zerocopy |
047af9cf EB |
547 | * |
548 | * The macvlan supports zerocopy iff the lower device supports zero | |
549 | * copy so we don't have to look at the lower device directly. | |
97bc3633 | 550 | */ |
6fe3faf8 | 551 | if ((tap->dev->features & NETIF_F_HIGHDMA) && (tap->dev->features & NETIF_F_SG)) |
047af9cf | 552 | sock_set_flag(&q->sk, SOCK_ZEROCOPY); |
97bc3633 | 553 | |
6fe3faf8 | 554 | err = tap_set_queue(tap, file, q); |
78e0ea67 | 555 | if (err) { |
5990a305 | 556 | /* tap_sock_destruct() will take care of freeing ptr_ring */ |
78e0ea67 GM |
557 | goto err_put; |
558 | } | |
20d29d7a | 559 | |
f758bfec JA |
560 | /* tap groks IOCB_NOWAIT just fine, mark it as such */ |
561 | file->f_mode |= FMODE_NOWAIT; | |
562 | ||
6fe3faf8 | 563 | dev_put(tap->dev); |
362899b8 JW |
564 | |
565 | rtnl_unlock(); | |
566 | return err; | |
567 | ||
78e0ea67 | 568 | err_put: |
362899b8 JW |
569 | sock_put(&q->sk); |
570 | err: | |
6fe3faf8 SG |
571 | if (tap) |
572 | dev_put(tap->dev); | |
20d29d7a | 573 | |
40b8fe45 | 574 | rtnl_unlock(); |
20d29d7a AB |
575 | return err; |
576 | } | |
577 | ||
635b8c8e | 578 | static int tap_release(struct inode *inode, struct file *file) |
20d29d7a | 579 | { |
635b8c8e SG |
580 | struct tap_queue *q = file->private_data; |
581 | tap_put_queue(q); | |
20d29d7a AB |
582 | return 0; |
583 | } | |
584 | ||
afc9a42b | 585 | static __poll_t tap_poll(struct file *file, poll_table *wait) |
20d29d7a | 586 | { |
635b8c8e | 587 | struct tap_queue *q = file->private_data; |
a9a08845 | 588 | __poll_t mask = EPOLLERR; |
20d29d7a AB |
589 | |
590 | if (!q) | |
591 | goto out; | |
592 | ||
593 | mask = 0; | |
333f7909 | 594 | poll_wait(file, &q->sock.wq.wait, wait); |
20d29d7a | 595 | |
5990a305 | 596 | if (!ptr_ring_empty(&q->ring)) |
a9a08845 | 597 | mask |= EPOLLIN | EPOLLRDNORM; |
20d29d7a AB |
598 | |
599 | if (sock_writeable(&q->sk) || | |
9cd3e072 | 600 | (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &q->sock.flags) && |
20d29d7a | 601 | sock_writeable(&q->sk))) |
a9a08845 | 602 | mask |= EPOLLOUT | EPOLLWRNORM; |
20d29d7a AB |
603 | |
604 | out: | |
20d29d7a AB |
605 | return mask; |
606 | } | |
607 | ||
635b8c8e SG |
608 | static inline struct sk_buff *tap_alloc_skb(struct sock *sk, size_t prepad, |
609 | size_t len, size_t linear, | |
b9fb9ee0 AB |
610 | int noblock, int *err) |
611 | { | |
612 | struct sk_buff *skb; | |
613 | ||
614 | /* Under a page? Don't bother with paged skb. */ | |
615 | if (prepad + len < PAGE_SIZE || !linear) | |
616 | linear = len; | |
617 | ||
37dfe5b8 ED |
618 | if (len - linear > MAX_SKB_FRAGS * (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) |
619 | linear = len - MAX_SKB_FRAGS * (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER); | |
b9fb9ee0 | 620 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
37dfe5b8 | 621 | err, PAGE_ALLOC_COSTLY_ORDER); |
b9fb9ee0 AB |
622 | if (!skb) |
623 | return NULL; | |
624 | ||
625 | skb_reserve(skb, prepad); | |
626 | skb_put(skb, linear); | |
627 | skb->data_len = len - linear; | |
628 | skb->len += len - linear; | |
629 | ||
630 | return skb; | |
631 | } | |
632 | ||
2f1d8b9e | 633 | /* Neighbour code has some assumptions on HH_DATA_MOD alignment */ |
635b8c8e | 634 | #define TAP_RESERVE HH_DATA_OFF(ETH_HLEN) |
2f1d8b9e | 635 | |
20d29d7a | 636 | /* Get packet from user space buffer */ |
fe8dd45b | 637 | static ssize_t tap_get_user(struct tap_queue *q, void *msg_control, |
635b8c8e | 638 | struct iov_iter *from, int noblock) |
20d29d7a | 639 | { |
635b8c8e | 640 | int good_linear = SKB_MAX_HEAD(TAP_RESERVE); |
20d29d7a | 641 | struct sk_buff *skb; |
6fe3faf8 | 642 | struct tap_dev *tap; |
f5ff53b4 | 643 | unsigned long total_len = iov_iter_count(from); |
97bc3633 | 644 | unsigned long len = total_len; |
20d29d7a | 645 | int err; |
b9fb9ee0 AB |
646 | struct virtio_net_hdr vnet_hdr = { 0 }; |
647 | int vnet_hdr_len = 0; | |
b92946e2 | 648 | int copylen = 0; |
c5c62f1b | 649 | int depth; |
97bc3633 | 650 | bool zerocopy = false; |
61d46bf9 | 651 | size_t linear; |
736f16de | 652 | enum skb_drop_reason drop_reason; |
b9fb9ee0 AB |
653 | |
654 | if (q->flags & IFF_VNET_HDR) { | |
837585a5 | 655 | vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz); |
b9fb9ee0 AB |
656 | |
657 | err = -EINVAL; | |
ce3c8692 | 658 | if (len < vnet_hdr_len) |
b9fb9ee0 | 659 | goto err; |
ce3c8692 | 660 | len -= vnet_hdr_len; |
b9fb9ee0 | 661 | |
f5ff53b4 | 662 | err = -EFAULT; |
cbbd26b8 | 663 | if (!copy_from_iter_full(&vnet_hdr, sizeof(vnet_hdr), from)) |
b9fb9ee0 | 664 | goto err; |
f5ff53b4 | 665 | iov_iter_advance(from, vnet_hdr_len - sizeof(vnet_hdr)); |
b9fb9ee0 | 666 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
635b8c8e SG |
667 | tap16_to_cpu(q, vnet_hdr.csum_start) + |
668 | tap16_to_cpu(q, vnet_hdr.csum_offset) + 2 > | |
669 | tap16_to_cpu(q, vnet_hdr.hdr_len)) | |
670 | vnet_hdr.hdr_len = cpu_to_tap16(q, | |
671 | tap16_to_cpu(q, vnet_hdr.csum_start) + | |
672 | tap16_to_cpu(q, vnet_hdr.csum_offset) + 2); | |
b9fb9ee0 | 673 | err = -EINVAL; |
635b8c8e | 674 | if (tap16_to_cpu(q, vnet_hdr.hdr_len) > len) |
b9fb9ee0 AB |
675 | goto err; |
676 | } | |
20d29d7a | 677 | |
b9fb9ee0 | 678 | err = -EINVAL; |
20d29d7a | 679 | if (unlikely(len < ETH_HLEN)) |
b9fb9ee0 | 680 | goto err; |
20d29d7a | 681 | |
fe8dd45b | 682 | if (msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) { |
f5ff53b4 AV |
683 | struct iov_iter i; |
684 | ||
6ae7feb3 | 685 | copylen = vnet_hdr.hdr_len ? |
635b8c8e | 686 | tap16_to_cpu(q, vnet_hdr.hdr_len) : GOODCOPY_LEN; |
16a3fa28 JW |
687 | if (copylen > good_linear) |
688 | copylen = good_linear; | |
8e2ad411 WB |
689 | else if (copylen < ETH_HLEN) |
690 | copylen = ETH_HLEN; | |
61d46bf9 | 691 | linear = copylen; |
f5ff53b4 AV |
692 | i = *from; |
693 | iov_iter_advance(&i, copylen); | |
694 | if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) | |
ece793fc JW |
695 | zerocopy = true; |
696 | } | |
697 | ||
698 | if (!zerocopy) { | |
97bc3633 | 699 | copylen = len; |
635b8c8e | 700 | linear = tap16_to_cpu(q, vnet_hdr.hdr_len); |
8e2ad411 | 701 | if (linear > good_linear) |
16a3fa28 | 702 | linear = good_linear; |
8e2ad411 WB |
703 | else if (linear < ETH_HLEN) |
704 | linear = ETH_HLEN; | |
61d46bf9 | 705 | } |
97bc3633 | 706 | |
635b8c8e SG |
707 | skb = tap_alloc_skb(&q->sk, TAP_RESERVE, copylen, |
708 | linear, noblock, &err); | |
02df55d2 AB |
709 | if (!skb) |
710 | goto err; | |
20d29d7a | 711 | |
01d6657b | 712 | if (zerocopy) |
f5ff53b4 | 713 | err = zerocopy_sg_from_iter(skb, from); |
aa196eed | 714 | else |
f5ff53b4 | 715 | err = skb_copy_datagram_from_iter(skb, 0, from, len); |
ece793fc | 716 | |
736f16de DZ |
717 | if (err) { |
718 | drop_reason = SKB_DROP_REASON_SKB_UCOPY_FAULT; | |
b9fb9ee0 | 719 | goto err_kfree; |
736f16de | 720 | } |
20d29d7a AB |
721 | |
722 | skb_set_network_header(skb, ETH_HLEN); | |
b9fb9ee0 AB |
723 | skb_reset_mac_header(skb); |
724 | skb->protocol = eth_hdr(skb)->h_proto; | |
725 | ||
4f61f133 CB |
726 | rcu_read_lock(); |
727 | tap = rcu_dereference(q->tap); | |
728 | if (!tap) { | |
729 | kfree_skb(skb); | |
730 | rcu_read_unlock(); | |
731 | return total_len; | |
732 | } | |
733 | skb->dev = tap->dev; | |
734 | ||
b9fb9ee0 | 735 | if (vnet_hdr_len) { |
fd88d68b | 736 | err = virtio_net_hdr_to_skb(skb, &vnet_hdr, |
635b8c8e | 737 | tap_is_little_endian(q)); |
736f16de | 738 | if (err) { |
4f61f133 | 739 | rcu_read_unlock(); |
736f16de | 740 | drop_reason = SKB_DROP_REASON_DEV_HDR; |
b9fb9ee0 | 741 | goto err_kfree; |
736f16de | 742 | } |
b9fb9ee0 AB |
743 | } |
744 | ||
d2aa125d | 745 | skb_probe_transport_header(skb); |
9b4d669b | 746 | |
c5c62f1b | 747 | /* Move network header to the right position for VLAN tagged packets */ |
b69df260 | 748 | if (eth_type_vlan(skb->protocol) && |
4063384e | 749 | vlan_get_protocol_and_depth(skb, skb->protocol, &depth) != 0) |
c5c62f1b IV |
750 | skb_set_network_header(skb, depth); |
751 | ||
97bc3633 | 752 | /* copy skb_ubuf_info for callback when skb has no error */ |
01d6657b | 753 | if (zerocopy) { |
9ee5e5ad | 754 | skb_zcopy_init(skb, msg_control); |
fe8dd45b JW |
755 | } else if (msg_control) { |
756 | struct ubuf_info *uarg = msg_control; | |
36177832 | 757 | uarg->callback(NULL, uarg, false); |
01d6657b | 758 | } |
aa196eed | 759 | |
4f61f133 | 760 | dev_queue_xmit(skb); |
ac4e4af1 | 761 | rcu_read_unlock(); |
97bc3633 | 762 | return total_len; |
02df55d2 | 763 | |
b9fb9ee0 | 764 | err_kfree: |
736f16de | 765 | kfree_skb_reason(skb, drop_reason); |
b9fb9ee0 | 766 | |
02df55d2 | 767 | err: |
ac4e4af1 | 768 | rcu_read_lock(); |
6fe3faf8 SG |
769 | tap = rcu_dereference(q->tap); |
770 | if (tap && tap->count_tx_dropped) | |
771 | tap->count_tx_dropped(tap); | |
ac4e4af1 | 772 | rcu_read_unlock(); |
02df55d2 | 773 | |
02df55d2 | 774 | return err; |
20d29d7a AB |
775 | } |
776 | ||
635b8c8e | 777 | static ssize_t tap_write_iter(struct kiocb *iocb, struct iov_iter *from) |
20d29d7a AB |
778 | { |
779 | struct file *file = iocb->ki_filp; | |
635b8c8e | 780 | struct tap_queue *q = file->private_data; |
f758bfec JA |
781 | int noblock = 0; |
782 | ||
783 | if ((file->f_flags & O_NONBLOCK) || (iocb->ki_flags & IOCB_NOWAIT)) | |
784 | noblock = 1; | |
20d29d7a | 785 | |
f758bfec | 786 | return tap_get_user(q, NULL, from, noblock); |
20d29d7a AB |
787 | } |
788 | ||
789 | /* Put packet to the user space buffer */ | |
635b8c8e SG |
790 | static ssize_t tap_put_user(struct tap_queue *q, |
791 | const struct sk_buff *skb, | |
792 | struct iov_iter *iter) | |
20d29d7a | 793 | { |
20d29d7a | 794 | int ret; |
b9fb9ee0 | 795 | int vnet_hdr_len = 0; |
f09e2249 | 796 | int vlan_offset = 0; |
6c36d2e2 | 797 | int total; |
b9fb9ee0 AB |
798 | |
799 | if (q->flags & IFF_VNET_HDR) { | |
fd3a8862 | 800 | int vlan_hlen = skb_vlan_tag_present(skb) ? VLAN_HLEN : 0; |
b9fb9ee0 | 801 | struct virtio_net_hdr vnet_hdr; |
fd3a8862 | 802 | |
837585a5 | 803 | vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz); |
6c36d2e2 | 804 | if (iov_iter_count(iter) < vnet_hdr_len) |
b9fb9ee0 AB |
805 | return -EINVAL; |
806 | ||
3e9e40e7 | 807 | if (virtio_net_hdr_from_skb(skb, &vnet_hdr, |
fd3a8862 WB |
808 | tap_is_little_endian(q), true, |
809 | vlan_hlen)) | |
fd88d68b | 810 | BUG(); |
b9fb9ee0 | 811 | |
6c36d2e2 HX |
812 | if (copy_to_iter(&vnet_hdr, sizeof(vnet_hdr), iter) != |
813 | sizeof(vnet_hdr)) | |
b9fb9ee0 | 814 | return -EFAULT; |
7cc76f51 JW |
815 | |
816 | iov_iter_advance(iter, vnet_hdr_len - sizeof(vnet_hdr)); | |
b9fb9ee0 | 817 | } |
6c36d2e2 | 818 | total = vnet_hdr_len; |
ce232ce0 | 819 | total += skb->len; |
f09e2249 | 820 | |
df8a39de | 821 | if (skb_vlan_tag_present(skb)) { |
f09e2249 BG |
822 | struct { |
823 | __be16 h_vlan_proto; | |
824 | __be16 h_vlan_TCI; | |
825 | } veth; | |
0fbe0d47 | 826 | veth.h_vlan_proto = skb->vlan_proto; |
df8a39de | 827 | veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb)); |
f09e2249 BG |
828 | |
829 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
ce232ce0 | 830 | total += VLAN_HLEN; |
f09e2249 | 831 | |
6c36d2e2 HX |
832 | ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset); |
833 | if (ret || !iov_iter_count(iter)) | |
f09e2249 BG |
834 | goto done; |
835 | ||
6c36d2e2 HX |
836 | ret = copy_to_iter(&veth, sizeof(veth), iter); |
837 | if (ret != sizeof(veth) || !iov_iter_count(iter)) | |
f09e2249 BG |
838 | goto done; |
839 | } | |
20d29d7a | 840 | |
6c36d2e2 HX |
841 | ret = skb_copy_datagram_iter(skb, vlan_offset, iter, |
842 | skb->len - vlan_offset); | |
20d29d7a | 843 | |
f09e2249 | 844 | done: |
ce232ce0 | 845 | return ret ? ret : total; |
20d29d7a AB |
846 | } |
847 | ||
635b8c8e SG |
848 | static ssize_t tap_do_read(struct tap_queue *q, |
849 | struct iov_iter *to, | |
3b4ba04a | 850 | int noblock, struct sk_buff *skb) |
20d29d7a | 851 | { |
ccf7e72b | 852 | DEFINE_WAIT(wait); |
501c774c | 853 | ssize_t ret = 0; |
20d29d7a | 854 | |
61d78537 | 855 | if (!iov_iter_count(to)) { |
144a6adf | 856 | kfree_skb(skb); |
3af0bfe5 | 857 | return 0; |
61d78537 | 858 | } |
3af0bfe5 | 859 | |
3b4ba04a JW |
860 | if (skb) |
861 | goto put; | |
862 | ||
3af0bfe5 | 863 | while (1) { |
89cee917 JW |
864 | if (!noblock) |
865 | prepare_to_wait(sk_sleep(&q->sk), &wait, | |
866 | TASK_INTERRUPTIBLE); | |
20d29d7a AB |
867 | |
868 | /* Read frames from the queue */ | |
5990a305 | 869 | skb = ptr_ring_consume(&q->ring); |
3af0bfe5 AV |
870 | if (skb) |
871 | break; | |
872 | if (noblock) { | |
873 | ret = -EAGAIN; | |
874 | break; | |
20d29d7a | 875 | } |
3af0bfe5 AV |
876 | if (signal_pending(current)) { |
877 | ret = -ERESTARTSYS; | |
878 | break; | |
879 | } | |
880 | /* Nothing to read, let's sleep */ | |
881 | schedule(); | |
882 | } | |
a499a2e9 VY |
883 | if (!noblock) |
884 | finish_wait(sk_sleep(&q->sk), &wait); | |
885 | ||
3b4ba04a | 886 | put: |
3af0bfe5 | 887 | if (skb) { |
635b8c8e | 888 | ret = tap_put_user(q, skb, to); |
f51a5e82 JW |
889 | if (unlikely(ret < 0)) |
890 | kfree_skb(skb); | |
891 | else | |
892 | consume_skb(skb); | |
20d29d7a | 893 | } |
501c774c AB |
894 | return ret; |
895 | } | |
896 | ||
635b8c8e | 897 | static ssize_t tap_read_iter(struct kiocb *iocb, struct iov_iter *to) |
501c774c AB |
898 | { |
899 | struct file *file = iocb->ki_filp; | |
635b8c8e | 900 | struct tap_queue *q = file->private_data; |
3af0bfe5 | 901 | ssize_t len = iov_iter_count(to), ret; |
f758bfec JA |
902 | int noblock = 0; |
903 | ||
904 | if ((file->f_flags & O_NONBLOCK) || (iocb->ki_flags & IOCB_NOWAIT)) | |
905 | noblock = 1; | |
20d29d7a | 906 | |
f758bfec | 907 | ret = tap_do_read(q, to, noblock, NULL); |
ce232ce0 | 908 | ret = min_t(ssize_t, ret, len); |
e6ebc7f1 ZYW |
909 | if (ret > 0) |
910 | iocb->ki_pos = ret; | |
20d29d7a AB |
911 | return ret; |
912 | } | |
913 | ||
6fe3faf8 | 914 | static struct tap_dev *tap_get_tap_dev(struct tap_queue *q) |
8f475a31 | 915 | { |
6fe3faf8 | 916 | struct tap_dev *tap; |
8f475a31 | 917 | |
441ac0fc | 918 | ASSERT_RTNL(); |
6fe3faf8 SG |
919 | tap = rtnl_dereference(q->tap); |
920 | if (tap) | |
921 | dev_hold(tap->dev); | |
8f475a31 | 922 | |
6fe3faf8 | 923 | return tap; |
8f475a31 JW |
924 | } |
925 | ||
6fe3faf8 | 926 | static void tap_put_tap_dev(struct tap_dev *tap) |
8f475a31 | 927 | { |
6fe3faf8 | 928 | dev_put(tap->dev); |
8f475a31 JW |
929 | } |
930 | ||
635b8c8e | 931 | static int tap_ioctl_set_queue(struct file *file, unsigned int flags) |
815f236d | 932 | { |
635b8c8e | 933 | struct tap_queue *q = file->private_data; |
6fe3faf8 | 934 | struct tap_dev *tap; |
815f236d JW |
935 | int ret; |
936 | ||
6fe3faf8 SG |
937 | tap = tap_get_tap_dev(q); |
938 | if (!tap) | |
815f236d JW |
939 | return -EINVAL; |
940 | ||
941 | if (flags & IFF_ATTACH_QUEUE) | |
6fe3faf8 | 942 | ret = tap_enable_queue(tap, file, q); |
815f236d | 943 | else if (flags & IFF_DETACH_QUEUE) |
635b8c8e | 944 | ret = tap_disable_queue(q); |
f57855a5 JW |
945 | else |
946 | ret = -EINVAL; | |
815f236d | 947 | |
6fe3faf8 | 948 | tap_put_tap_dev(tap); |
815f236d JW |
949 | return ret; |
950 | } | |
951 | ||
635b8c8e | 952 | static int set_offload(struct tap_queue *q, unsigned long arg) |
2be5c767 | 953 | { |
6fe3faf8 | 954 | struct tap_dev *tap; |
2be5c767 VY |
955 | netdev_features_t features; |
956 | netdev_features_t feature_mask = 0; | |
957 | ||
6fe3faf8 SG |
958 | tap = rtnl_dereference(q->tap); |
959 | if (!tap) | |
2be5c767 VY |
960 | return -ENOLINK; |
961 | ||
6fe3faf8 | 962 | features = tap->dev->features; |
2be5c767 VY |
963 | |
964 | if (arg & TUN_F_CSUM) { | |
965 | feature_mask = NETIF_F_HW_CSUM; | |
966 | ||
967 | if (arg & (TUN_F_TSO4 | TUN_F_TSO6)) { | |
968 | if (arg & TUN_F_TSO_ECN) | |
969 | feature_mask |= NETIF_F_TSO_ECN; | |
970 | if (arg & TUN_F_TSO4) | |
971 | feature_mask |= NETIF_F_TSO; | |
972 | if (arg & TUN_F_TSO6) | |
973 | feature_mask |= NETIF_F_TSO6; | |
974 | } | |
399e0827 AM |
975 | |
976 | /* TODO: for now USO4 and USO6 should work simultaneously */ | |
977 | if ((arg & (TUN_F_USO4 | TUN_F_USO6)) == (TUN_F_USO4 | TUN_F_USO6)) | |
978 | features |= NETIF_F_GSO_UDP_L4; | |
2be5c767 VY |
979 | } |
980 | ||
981 | /* tun/tap driver inverts the usage for TSO offloads, where | |
982 | * setting the TSO bit means that the userspace wants to | |
983 | * accept TSO frames and turning it off means that user space | |
984 | * does not support TSO. | |
635b8c8e | 985 | * For tap, we have to invert it to mean the same thing. |
2be5c767 VY |
986 | * When user space turns off TSO, we turn off GSO/LRO so that |
987 | * user-space will not receive TSO frames. | |
988 | */ | |
399e0827 AM |
989 | if (feature_mask & (NETIF_F_TSO | NETIF_F_TSO6) || |
990 | (feature_mask & (TUN_F_USO4 | TUN_F_USO6)) == (TUN_F_USO4 | TUN_F_USO6)) | |
2be5c767 VY |
991 | features |= RX_OFFLOADS; |
992 | else | |
993 | features &= ~RX_OFFLOADS; | |
994 | ||
995 | /* tap_features are the same as features on tun/tap and | |
996 | * reflect user expectations. | |
997 | */ | |
6fe3faf8 SG |
998 | tap->tap_features = feature_mask; |
999 | if (tap->update_features) | |
1000 | tap->update_features(tap, features); | |
2be5c767 VY |
1001 | |
1002 | return 0; | |
1003 | } | |
1004 | ||
20d29d7a AB |
1005 | /* |
1006 | * provide compatibility with generic tun/tap interface | |
1007 | */ | |
635b8c8e SG |
1008 | static long tap_ioctl(struct file *file, unsigned int cmd, |
1009 | unsigned long arg) | |
20d29d7a | 1010 | { |
635b8c8e | 1011 | struct tap_queue *q = file->private_data; |
6fe3faf8 | 1012 | struct tap_dev *tap; |
20d29d7a AB |
1013 | void __user *argp = (void __user *)arg; |
1014 | struct ifreq __user *ifr = argp; | |
1015 | unsigned int __user *up = argp; | |
39ec7de7 | 1016 | unsigned short u; |
55afbd08 | 1017 | int __user *sp = argp; |
7f460d30 | 1018 | struct sockaddr sa; |
55afbd08 | 1019 | int s; |
02df55d2 | 1020 | int ret; |
20d29d7a AB |
1021 | |
1022 | switch (cmd) { | |
1023 | case TUNSETIFF: | |
1024 | /* ignore the name, just look at flags */ | |
1025 | if (get_user(u, &ifr->ifr_flags)) | |
1026 | return -EFAULT; | |
b9fb9ee0 AB |
1027 | |
1028 | ret = 0; | |
635b8c8e | 1029 | if ((u & ~TAP_IFFEATURES) != (IFF_NO_PI | IFF_TAP)) |
b9fb9ee0 AB |
1030 | ret = -EINVAL; |
1031 | else | |
635b8c8e | 1032 | q->flags = (q->flags & ~TAP_IFFEATURES) | u; |
b9fb9ee0 AB |
1033 | |
1034 | return ret; | |
20d29d7a AB |
1035 | |
1036 | case TUNGETIFF: | |
441ac0fc | 1037 | rtnl_lock(); |
6fe3faf8 SG |
1038 | tap = tap_get_tap_dev(q); |
1039 | if (!tap) { | |
441ac0fc | 1040 | rtnl_unlock(); |
20d29d7a | 1041 | return -ENOLINK; |
441ac0fc | 1042 | } |
20d29d7a | 1043 | |
02df55d2 | 1044 | ret = 0; |
39ec7de7 | 1045 | u = q->flags; |
6fe3faf8 | 1046 | if (copy_to_user(&ifr->ifr_name, tap->dev->name, IFNAMSIZ) || |
39ec7de7 | 1047 | put_user(u, &ifr->ifr_flags)) |
02df55d2 | 1048 | ret = -EFAULT; |
6fe3faf8 | 1049 | tap_put_tap_dev(tap); |
441ac0fc | 1050 | rtnl_unlock(); |
02df55d2 | 1051 | return ret; |
20d29d7a | 1052 | |
815f236d JW |
1053 | case TUNSETQUEUE: |
1054 | if (get_user(u, &ifr->ifr_flags)) | |
1055 | return -EFAULT; | |
441ac0fc | 1056 | rtnl_lock(); |
635b8c8e | 1057 | ret = tap_ioctl_set_queue(file, u); |
441ac0fc | 1058 | rtnl_unlock(); |
82a19eb8 | 1059 | return ret; |
815f236d | 1060 | |
20d29d7a | 1061 | case TUNGETFEATURES: |
635b8c8e | 1062 | if (put_user(IFF_TAP | IFF_NO_PI | TAP_IFFEATURES, up)) |
20d29d7a AB |
1063 | return -EFAULT; |
1064 | return 0; | |
1065 | ||
1066 | case TUNSETSNDBUF: | |
3ea79249 | 1067 | if (get_user(s, sp)) |
20d29d7a | 1068 | return -EFAULT; |
93161922 CG |
1069 | if (s <= 0) |
1070 | return -EINVAL; | |
20d29d7a | 1071 | |
3ea79249 | 1072 | q->sk.sk_sndbuf = s; |
20d29d7a AB |
1073 | return 0; |
1074 | ||
55afbd08 MT |
1075 | case TUNGETVNETHDRSZ: |
1076 | s = q->vnet_hdr_sz; | |
1077 | if (put_user(s, sp)) | |
1078 | return -EFAULT; | |
1079 | return 0; | |
1080 | ||
1081 | case TUNSETVNETHDRSZ: | |
1082 | if (get_user(s, sp)) | |
1083 | return -EFAULT; | |
1084 | if (s < (int)sizeof(struct virtio_net_hdr)) | |
1085 | return -EINVAL; | |
1086 | ||
1087 | q->vnet_hdr_sz = s; | |
1088 | return 0; | |
1089 | ||
01b07fb3 | 1090 | case TUNGETVNETLE: |
635b8c8e | 1091 | s = !!(q->flags & TAP_VNET_LE); |
01b07fb3 MT |
1092 | if (put_user(s, sp)) |
1093 | return -EFAULT; | |
1094 | return 0; | |
1095 | ||
1096 | case TUNSETVNETLE: | |
1097 | if (get_user(s, sp)) | |
1098 | return -EFAULT; | |
1099 | if (s) | |
635b8c8e | 1100 | q->flags |= TAP_VNET_LE; |
01b07fb3 | 1101 | else |
635b8c8e | 1102 | q->flags &= ~TAP_VNET_LE; |
01b07fb3 MT |
1103 | return 0; |
1104 | ||
8b8e658b | 1105 | case TUNGETVNETBE: |
635b8c8e | 1106 | return tap_get_vnet_be(q, sp); |
8b8e658b GK |
1107 | |
1108 | case TUNSETVNETBE: | |
635b8c8e | 1109 | return tap_set_vnet_be(q, sp); |
8b8e658b | 1110 | |
20d29d7a AB |
1111 | case TUNSETOFFLOAD: |
1112 | /* let the user check for future flags */ | |
1113 | if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | | |
399e0827 AM |
1114 | TUN_F_TSO_ECN | TUN_F_UFO | |
1115 | TUN_F_USO4 | TUN_F_USO6)) | |
20d29d7a AB |
1116 | return -EINVAL; |
1117 | ||
2be5c767 VY |
1118 | rtnl_lock(); |
1119 | ret = set_offload(q, arg); | |
1120 | rtnl_unlock(); | |
1121 | return ret; | |
20d29d7a | 1122 | |
b5082083 JC |
1123 | case SIOCGIFHWADDR: |
1124 | rtnl_lock(); | |
6fe3faf8 SG |
1125 | tap = tap_get_tap_dev(q); |
1126 | if (!tap) { | |
b5082083 JC |
1127 | rtnl_unlock(); |
1128 | return -ENOLINK; | |
1129 | } | |
1130 | ret = 0; | |
3b23a32a | 1131 | dev_get_mac_address(&sa, dev_net(tap->dev), tap->dev->name); |
6fe3faf8 | 1132 | if (copy_to_user(&ifr->ifr_name, tap->dev->name, IFNAMSIZ) || |
3b23a32a | 1133 | copy_to_user(&ifr->ifr_hwaddr, &sa, sizeof(sa))) |
b5082083 | 1134 | ret = -EFAULT; |
6fe3faf8 | 1135 | tap_put_tap_dev(tap); |
b5082083 JC |
1136 | rtnl_unlock(); |
1137 | return ret; | |
1138 | ||
1139 | case SIOCSIFHWADDR: | |
7f460d30 JC |
1140 | if (copy_from_user(&sa, &ifr->ifr_hwaddr, sizeof(sa))) |
1141 | return -EFAULT; | |
b5082083 | 1142 | rtnl_lock(); |
6fe3faf8 SG |
1143 | tap = tap_get_tap_dev(q); |
1144 | if (!tap) { | |
b5082083 JC |
1145 | rtnl_unlock(); |
1146 | return -ENOLINK; | |
1147 | } | |
3b23a32a | 1148 | ret = dev_set_mac_address_user(tap->dev, &sa, NULL); |
6fe3faf8 | 1149 | tap_put_tap_dev(tap); |
b5082083 JC |
1150 | rtnl_unlock(); |
1151 | return ret; | |
1152 | ||
20d29d7a AB |
1153 | default: |
1154 | return -EINVAL; | |
1155 | } | |
1156 | } | |
1157 | ||
d17eb73b | 1158 | static const struct file_operations tap_fops = { |
20d29d7a | 1159 | .owner = THIS_MODULE, |
635b8c8e SG |
1160 | .open = tap_open, |
1161 | .release = tap_release, | |
1162 | .read_iter = tap_read_iter, | |
1163 | .write_iter = tap_write_iter, | |
1164 | .poll = tap_poll, | |
20d29d7a | 1165 | .llseek = no_llseek, |
635b8c8e | 1166 | .unlocked_ioctl = tap_ioctl, |
407e9ef7 | 1167 | .compat_ioctl = compat_ptr_ioctl, |
20d29d7a AB |
1168 | }; |
1169 | ||
0efac277 JW |
1170 | static int tap_get_user_xdp(struct tap_queue *q, struct xdp_buff *xdp) |
1171 | { | |
1172 | struct tun_xdp_hdr *hdr = xdp->data_hard_start; | |
1173 | struct virtio_net_hdr *gso = &hdr->gso; | |
1174 | int buflen = hdr->buflen; | |
1175 | int vnet_hdr_len = 0; | |
1176 | struct tap_dev *tap; | |
1177 | struct sk_buff *skb; | |
1178 | int err, depth; | |
1179 | ||
1180 | if (q->flags & IFF_VNET_HDR) | |
1181 | vnet_hdr_len = READ_ONCE(q->vnet_hdr_sz); | |
1182 | ||
1183 | skb = build_skb(xdp->data_hard_start, buflen); | |
1184 | if (!skb) { | |
1185 | err = -ENOMEM; | |
1186 | goto err; | |
1187 | } | |
1188 | ||
1189 | skb_reserve(skb, xdp->data - xdp->data_hard_start); | |
1190 | skb_put(skb, xdp->data_end - xdp->data); | |
1191 | ||
1192 | skb_set_network_header(skb, ETH_HLEN); | |
1193 | skb_reset_mac_header(skb); | |
1194 | skb->protocol = eth_hdr(skb)->h_proto; | |
1195 | ||
1196 | if (vnet_hdr_len) { | |
1197 | err = virtio_net_hdr_to_skb(skb, gso, tap_is_little_endian(q)); | |
1198 | if (err) | |
1199 | goto err_kfree; | |
1200 | } | |
1201 | ||
0efac277 | 1202 | /* Move network header to the right position for VLAN tagged packets */ |
b69df260 | 1203 | if (eth_type_vlan(skb->protocol) && |
4063384e | 1204 | vlan_get_protocol_and_depth(skb, skb->protocol, &depth) != 0) |
0efac277 JW |
1205 | skb_set_network_header(skb, depth); |
1206 | ||
1207 | rcu_read_lock(); | |
1208 | tap = rcu_dereference(q->tap); | |
1209 | if (tap) { | |
1210 | skb->dev = tap->dev; | |
d2aa125d | 1211 | skb_probe_transport_header(skb); |
0efac277 JW |
1212 | dev_queue_xmit(skb); |
1213 | } else { | |
1214 | kfree_skb(skb); | |
1215 | } | |
1216 | rcu_read_unlock(); | |
1217 | ||
1218 | return 0; | |
1219 | ||
1220 | err_kfree: | |
1221 | kfree_skb(skb); | |
1222 | err: | |
1223 | rcu_read_lock(); | |
faeacb6d | 1224 | tap = rcu_dereference(q->tap); |
0efac277 JW |
1225 | if (tap && tap->count_tx_dropped) |
1226 | tap->count_tx_dropped(tap); | |
1227 | rcu_read_unlock(); | |
1228 | return err; | |
1229 | } | |
1230 | ||
635b8c8e SG |
1231 | static int tap_sendmsg(struct socket *sock, struct msghdr *m, |
1232 | size_t total_len) | |
501c774c | 1233 | { |
635b8c8e | 1234 | struct tap_queue *q = container_of(sock, struct tap_queue, sock); |
fe8dd45b | 1235 | struct tun_msg_ctl *ctl = m->msg_control; |
0efac277 JW |
1236 | struct xdp_buff *xdp; |
1237 | int i; | |
fe8dd45b | 1238 | |
74a335a0 HH |
1239 | if (m->msg_controllen == sizeof(struct tun_msg_ctl) && |
1240 | ctl && ctl->type == TUN_MSG_PTR) { | |
0efac277 JW |
1241 | for (i = 0; i < ctl->num; i++) { |
1242 | xdp = &((struct xdp_buff *)ctl->ptr)[i]; | |
1243 | tap_get_user_xdp(q, xdp); | |
1244 | } | |
1245 | return 0; | |
1246 | } | |
fe8dd45b JW |
1247 | |
1248 | return tap_get_user(q, ctl ? ctl->ptr : NULL, &m->msg_iter, | |
1249 | m->msg_flags & MSG_DONTWAIT); | |
501c774c AB |
1250 | } |
1251 | ||
635b8c8e SG |
1252 | static int tap_recvmsg(struct socket *sock, struct msghdr *m, |
1253 | size_t total_len, int flags) | |
501c774c | 1254 | { |
635b8c8e | 1255 | struct tap_queue *q = container_of(sock, struct tap_queue, sock); |
61d78537 | 1256 | struct sk_buff *skb = m->msg_control; |
501c774c | 1257 | int ret; |
61d78537 | 1258 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) { |
144a6adf | 1259 | kfree_skb(skb); |
501c774c | 1260 | return -EINVAL; |
61d78537 WX |
1261 | } |
1262 | ret = tap_do_read(q, &m->msg_iter, flags & MSG_DONTWAIT, skb); | |
de2aa476 DM |
1263 | if (ret > total_len) { |
1264 | m->msg_flags |= MSG_TRUNC; | |
1265 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1266 | } | |
501c774c AB |
1267 | return ret; |
1268 | } | |
1269 | ||
635b8c8e | 1270 | static int tap_peek_len(struct socket *sock) |
362899b8 | 1271 | { |
635b8c8e | 1272 | struct tap_queue *q = container_of(sock, struct tap_queue, |
362899b8 | 1273 | sock); |
5990a305 | 1274 | return PTR_RING_PEEK_CALL(&q->ring, __skb_array_len_with_tag); |
362899b8 JW |
1275 | } |
1276 | ||
501c774c | 1277 | /* Ops structure to mimic raw sockets with tun */ |
635b8c8e SG |
1278 | static const struct proto_ops tap_socket_ops = { |
1279 | .sendmsg = tap_sendmsg, | |
1280 | .recvmsg = tap_recvmsg, | |
1281 | .peek_len = tap_peek_len, | |
501c774c AB |
1282 | }; |
1283 | ||
1284 | /* Get an underlying socket object from tun file. Returns error unless file is | |
1285 | * attached to a device. The returned object works like a packet socket, it | |
1286 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
1287 | * holding a reference to the file for as long as the socket is in use. */ | |
635b8c8e | 1288 | struct socket *tap_get_socket(struct file *file) |
501c774c | 1289 | { |
635b8c8e SG |
1290 | struct tap_queue *q; |
1291 | if (file->f_op != &tap_fops) | |
501c774c AB |
1292 | return ERR_PTR(-EINVAL); |
1293 | q = file->private_data; | |
1294 | if (!q) | |
1295 | return ERR_PTR(-EBADFD); | |
1296 | return &q->sock; | |
1297 | } | |
635b8c8e | 1298 | EXPORT_SYMBOL_GPL(tap_get_socket); |
501c774c | 1299 | |
5990a305 | 1300 | struct ptr_ring *tap_get_ptr_ring(struct file *file) |
49f96fd0 JW |
1301 | { |
1302 | struct tap_queue *q; | |
1303 | ||
1304 | if (file->f_op != &tap_fops) | |
1305 | return ERR_PTR(-EINVAL); | |
1306 | q = file->private_data; | |
1307 | if (!q) | |
1308 | return ERR_PTR(-EBADFD); | |
5990a305 | 1309 | return &q->ring; |
49f96fd0 | 1310 | } |
5990a305 | 1311 | EXPORT_SYMBOL_GPL(tap_get_ptr_ring); |
49f96fd0 | 1312 | |
6fe3faf8 | 1313 | int tap_queue_resize(struct tap_dev *tap) |
362899b8 | 1314 | { |
6fe3faf8 | 1315 | struct net_device *dev = tap->dev; |
635b8c8e | 1316 | struct tap_queue *q; |
5990a305 | 1317 | struct ptr_ring **rings; |
6fe3faf8 | 1318 | int n = tap->numqueues; |
362899b8 JW |
1319 | int ret, i = 0; |
1320 | ||
5990a305 JW |
1321 | rings = kmalloc_array(n, sizeof(*rings), GFP_KERNEL); |
1322 | if (!rings) | |
362899b8 JW |
1323 | return -ENOMEM; |
1324 | ||
6fe3faf8 | 1325 | list_for_each_entry(q, &tap->queue_list, next) |
5990a305 | 1326 | rings[i++] = &q->ring; |
362899b8 | 1327 | |
5990a305 JW |
1328 | ret = ptr_ring_resize_multiple(rings, n, |
1329 | dev->tx_queue_len, GFP_KERNEL, | |
1330 | __skb_array_destroy_skb); | |
362899b8 | 1331 | |
5990a305 | 1332 | kfree(rings); |
362899b8 JW |
1333 | return ret; |
1334 | } | |
9a393b5d | 1335 | EXPORT_SYMBOL_GPL(tap_queue_resize); |
ebc05ba7 | 1336 | |
d9f1f61c SG |
1337 | static int tap_list_add(dev_t major, const char *device_name) |
1338 | { | |
1339 | struct major_info *tap_major; | |
1340 | ||
1341 | tap_major = kzalloc(sizeof(*tap_major), GFP_ATOMIC); | |
1342 | if (!tap_major) | |
1343 | return -ENOMEM; | |
1344 | ||
1345 | tap_major->major = MAJOR(major); | |
1346 | ||
1347 | idr_init(&tap_major->minor_idr); | |
ffa423fb | 1348 | spin_lock_init(&tap_major->minor_lock); |
d9f1f61c SG |
1349 | |
1350 | tap_major->device_name = device_name; | |
1351 | ||
1352 | list_add_tail_rcu(&tap_major->next, &major_list); | |
1353 | return 0; | |
1354 | } | |
1355 | ||
dea6e19f GM |
1356 | int tap_create_cdev(struct cdev *tap_cdev, dev_t *tap_major, |
1357 | const char *device_name, struct module *module) | |
ebc05ba7 SG |
1358 | { |
1359 | int err; | |
1360 | ||
1361 | err = alloc_chrdev_region(tap_major, 0, TAP_NUM_DEVS, device_name); | |
1362 | if (err) | |
1363 | goto out1; | |
1364 | ||
1365 | cdev_init(tap_cdev, &tap_fops); | |
dea6e19f | 1366 | tap_cdev->owner = module; |
ebc05ba7 SG |
1367 | err = cdev_add(tap_cdev, *tap_major, TAP_NUM_DEVS); |
1368 | if (err) | |
1369 | goto out2; | |
1370 | ||
d9f1f61c SG |
1371 | err = tap_list_add(*tap_major, device_name); |
1372 | if (err) | |
1373 | goto out3; | |
ebc05ba7 SG |
1374 | |
1375 | return 0; | |
1376 | ||
d9f1f61c SG |
1377 | out3: |
1378 | cdev_del(tap_cdev); | |
ebc05ba7 SG |
1379 | out2: |
1380 | unregister_chrdev_region(*tap_major, TAP_NUM_DEVS); | |
1381 | out1: | |
1382 | return err; | |
1383 | } | |
9a393b5d | 1384 | EXPORT_SYMBOL_GPL(tap_create_cdev); |
ebc05ba7 SG |
1385 | |
1386 | void tap_destroy_cdev(dev_t major, struct cdev *tap_cdev) | |
1387 | { | |
d9f1f61c SG |
1388 | struct major_info *tap_major, *tmp; |
1389 | ||
ebc05ba7 SG |
1390 | cdev_del(tap_cdev); |
1391 | unregister_chrdev_region(major, TAP_NUM_DEVS); | |
d9f1f61c SG |
1392 | list_for_each_entry_safe(tap_major, tmp, &major_list, next) { |
1393 | if (tap_major->major == MAJOR(major)) { | |
1394 | idr_destroy(&tap_major->minor_idr); | |
1395 | list_del_rcu(&tap_major->next); | |
1396 | kfree_rcu(tap_major, rcu); | |
1397 | } | |
1398 | } | |
ebc05ba7 | 1399 | } |
9a393b5d SG |
1400 | EXPORT_SYMBOL_GPL(tap_destroy_cdev); |
1401 | ||
1402 | MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); | |
1403 | MODULE_AUTHOR("Sainath Grandhi <sainath.grandhi@intel.com>"); | |
1404 | MODULE_LICENSE("GPL"); |