projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'armsoc-late' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[deliverable/linux.git] / drivers / net / macvtap.c
1 #include <linux/etherdevice.h>
2 #include <linux/if_macvlan.h>
3 #include <linux/if_vlan.h>
4 #include <linux/interrupt.h>
5 #include <linux/nsproxy.h>
6 #include <linux/compat.h>
7 #include <linux/if_tun.h>
8 #include <linux/module.h>
9 #include <linux/skbuff.h>
10 #include <linux/cache.h>
11 #include <linux/sched.h>
12 #include <linux/types.h>
13 #include <linux/slab.h>
14 #include <linux/wait.h>
15 #include <linux/cdev.h>
16 #include <linux/idr.h>
17 #include <linux/fs.h>
18 #include <linux/uio.h>
19
20 #include <net/net_namespace.h>
21 #include <net/rtnetlink.h>
22 #include <net/sock.h>
23 #include <linux/virtio_net.h>
24
25 /*
26 * A macvtap queue is the central object of this driver, it connects
27 * an open character device to a macvlan interface. There can be
28 * multiple queues on one interface, which map back to queues
29 * implemented in hardware on the underlying device.
30 *
31 * macvtap_proto is used to allocate queues through the sock allocation
32 * mechanism.
33 *
34 */
35 struct macvtap_queue {
36 struct sock sk;
37 struct socket sock;
38 struct socket_wq wq;
39 int vnet_hdr_sz;
40 struct macvlan_dev __rcu *vlan;
41 struct file *file;
42 unsigned int flags;
43 u16 queue_index;
44 bool enabled;
45 struct list_head next;
46 };
47
48 #define MACVTAP_FEATURES (IFF_VNET_HDR | IFF_MULTI_QUEUE)
49
50 #define MACVTAP_VNET_LE 0x80000000
51 #define MACVTAP_VNET_BE 0x40000000
52
53 #ifdef CONFIG_TUN_VNET_CROSS_LE
54 static inline bool macvtap_legacy_is_little_endian(struct macvtap_queue *q)
55 {
56 return q->flags & MACVTAP_VNET_BE ? false :
57 virtio_legacy_is_little_endian();
58 }
59
60 static long macvtap_get_vnet_be(struct macvtap_queue *q, int __user *sp)
61 {
62 int s = !!(q->flags & MACVTAP_VNET_BE);
63
64 if (put_user(s, sp))
65 return -EFAULT;
66
67 return 0;
68 }
69
70 static long macvtap_set_vnet_be(struct macvtap_queue *q, int __user *sp)
71 {
72 int s;
73
74 if (get_user(s, sp))
75 return -EFAULT;
76
77 if (s)
78 q->flags |= MACVTAP_VNET_BE;
79 else
80 q->flags &= ~MACVTAP_VNET_BE;
81
82 return 0;
83 }
84 #else
85 static inline bool macvtap_legacy_is_little_endian(struct macvtap_queue *q)
86 {
87 return virtio_legacy_is_little_endian();
88 }
89
90 static long macvtap_get_vnet_be(struct macvtap_queue *q, int __user *argp)
91 {
92 return -EINVAL;
93 }
94
95 static long macvtap_set_vnet_be(struct macvtap_queue *q, int __user *argp)
96 {
97 return -EINVAL;
98 }
99 #endif /* CONFIG_TUN_VNET_CROSS_LE */
100
101 static inline bool macvtap_is_little_endian(struct macvtap_queue *q)
102 {
103 return q->flags & MACVTAP_VNET_LE ||
104 macvtap_legacy_is_little_endian(q);
105 }
106
107 static inline u16 macvtap16_to_cpu(struct macvtap_queue *q, __virtio16 val)
108 {
109 return __virtio16_to_cpu(macvtap_is_little_endian(q), val);
110 }
111
112 static inline __virtio16 cpu_to_macvtap16(struct macvtap_queue *q, u16 val)
113 {
114 return __cpu_to_virtio16(macvtap_is_little_endian(q), val);
115 }
116
117 static struct proto macvtap_proto = {
118 .name = "macvtap",
119 .owner = THIS_MODULE,
120 .obj_size = sizeof (struct macvtap_queue),
121 };
122
123 /*
124 * Variables for dealing with macvtaps device numbers.
125 */
126 static dev_t macvtap_major;
127 #define MACVTAP_NUM_DEVS (1U << MINORBITS)
128 static DEFINE_MUTEX(minor_lock);
129 static DEFINE_IDR(minor_idr);
130
131 #define GOODCOPY_LEN 128
132 static const void *macvtap_net_namespace(struct device *d)
133 {
134 struct net_device *dev = to_net_dev(d->parent);
135 return dev_net(dev);
136 }
137
138 static struct class macvtap_class = {
139 .name = "macvtap",
140 .owner = THIS_MODULE,
141 .ns_type = &net_ns_type_operations,
142 .namespace = macvtap_net_namespace,
143 };
144 static struct cdev macvtap_cdev;
145
146 static const struct proto_ops macvtap_socket_ops;
147
148 #define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \
149 NETIF_F_TSO6 | NETIF_F_UFO)
150 #define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO)
151 #define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG | NETIF_F_FRAGLIST)
152
153 static struct macvlan_dev *macvtap_get_vlan_rcu(const struct net_device *dev)
154 {
155 return rcu_dereference(dev->rx_handler_data);
156 }
157
158 /*
159 * RCU usage:
160 * The macvtap_queue and the macvlan_dev are loosely coupled, the
161 * pointers from one to the other can only be read while rcu_read_lock
162 * or rtnl is held.
163 *
164 * Both the file and the macvlan_dev hold a reference on the macvtap_queue
165 * through sock_hold(&q->sk). When the macvlan_dev goes away first,
166 * q->vlan becomes inaccessible. When the files gets closed,
167 * macvtap_get_queue() fails.
168 *
169 * There may still be references to the struct sock inside of the
170 * queue from outbound SKBs, but these never reference back to the
171 * file or the dev. The data structure is freed through __sk_free
172 * when both our references and any pending SKBs are gone.
173 */
174
175 static int macvtap_enable_queue(struct net_device *dev, struct file *file,
176 struct macvtap_queue *q)
177 {
178 struct macvlan_dev *vlan = netdev_priv(dev);
179 int err = -EINVAL;
180
181 ASSERT_RTNL();
182
183 if (q->enabled)
184 goto out;
185
186 err = 0;
187 rcu_assign_pointer(vlan->taps[vlan->numvtaps], q);
188 q->queue_index = vlan->numvtaps;
189 q->enabled = true;
190
191 vlan->numvtaps++;
192 out:
193 return err;
194 }
195
196 /* Requires RTNL */
197 static int macvtap_set_queue(struct net_device *dev, struct file *file,
198 struct macvtap_queue *q)
199 {
200 struct macvlan_dev *vlan = netdev_priv(dev);
201
202 if (vlan->numqueues == MAX_MACVTAP_QUEUES)
203 return -EBUSY;
204
205 rcu_assign_pointer(q->vlan, vlan);
206 rcu_assign_pointer(vlan->taps[vlan->numvtaps], q);
207 sock_hold(&q->sk);
208
209 q->file = file;
210 q->queue_index = vlan->numvtaps;
211 q->enabled = true;
212 file->private_data = q;
213 list_add_tail(&q->next, &vlan->queue_list);
214
215 vlan->numvtaps++;
216 vlan->numqueues++;
217
218 return 0;
219 }
220
221 static int macvtap_disable_queue(struct macvtap_queue *q)
222 {
223 struct macvlan_dev *vlan;
224 struct macvtap_queue *nq;
225
226 ASSERT_RTNL();
227 if (!q->enabled)
228 return -EINVAL;
229
230 vlan = rtnl_dereference(q->vlan);
231
232 if (vlan) {
233 int index = q->queue_index;
234 BUG_ON(index >= vlan->numvtaps);
235 nq = rtnl_dereference(vlan->taps[vlan->numvtaps - 1]);
236 nq->queue_index = index;
237
238 rcu_assign_pointer(vlan->taps[index], nq);
239 RCU_INIT_POINTER(vlan->taps[vlan->numvtaps - 1], NULL);
240 q->enabled = false;
241
242 vlan->numvtaps--;
243 }
244
245 return 0;
246 }
247
248 /*
249 * The file owning the queue got closed, give up both
250 * the reference that the files holds as well as the
251 * one from the macvlan_dev if that still exists.
252 *
253 * Using the spinlock makes sure that we don't get
254 * to the queue again after destroying it.
255 */
256 static void macvtap_put_queue(struct macvtap_queue *q)
257 {
258 struct macvlan_dev *vlan;
259
260 rtnl_lock();
261 vlan = rtnl_dereference(q->vlan);
262
263 if (vlan) {
264 if (q->enabled)
265 BUG_ON(macvtap_disable_queue(q));
266
267 vlan->numqueues--;
268 RCU_INIT_POINTER(q->vlan, NULL);
269 sock_put(&q->sk);
270 list_del_init(&q->next);
271 }
272
273 rtnl_unlock();
274
275 synchronize_rcu();
276 sock_put(&q->sk);
277 }
278
279 /*
280 * Select a queue based on the rxq of the device on which this packet
281 * arrived. If the incoming device is not mq, calculate a flow hash
282 * to select a queue. If all fails, find the first available queue.
283 * Cache vlan->numvtaps since it can become zero during the execution
284 * of this function.
285 */
286 static struct macvtap_queue *macvtap_get_queue(struct net_device *dev,
287 struct sk_buff *skb)
288 {
289 struct macvlan_dev *vlan = netdev_priv(dev);
290 struct macvtap_queue *tap = NULL;
291 /* Access to taps array is protected by rcu, but access to numvtaps
292 * isn't. Below we use it to lookup a queue, but treat it as a hint
293 * and validate that the result isn't NULL - in case we are
294 * racing against queue removal.
295 */
296 int numvtaps = ACCESS_ONCE(vlan->numvtaps);
297 __u32 rxq;
298
299 if (!numvtaps)
300 goto out;
301
302 /* Check if we can use flow to select a queue */
303 rxq = skb_get_hash(skb);
304 if (rxq) {
305 tap = rcu_dereference(vlan->taps[rxq % numvtaps]);
306 goto out;
307 }
308
309 if (likely(skb_rx_queue_recorded(skb))) {
310 rxq = skb_get_rx_queue(skb);
311
312 while (unlikely(rxq >= numvtaps))
313 rxq -= numvtaps;
314
315 tap = rcu_dereference(vlan->taps[rxq]);
316 goto out;
317 }
318
319 tap = rcu_dereference(vlan->taps[0]);
320 out:
321 return tap;
322 }
323
324 /*
325 * The net_device is going away, give up the reference
326 * that it holds on all queues and safely set the pointer
327 * from the queues to NULL.
328 */
329 static void macvtap_del_queues(struct net_device *dev)
330 {
331 struct macvlan_dev *vlan = netdev_priv(dev);
332 struct macvtap_queue *q, *tmp;
333
334 ASSERT_RTNL();
335 list_for_each_entry_safe(q, tmp, &vlan->queue_list, next) {
336 list_del_init(&q->next);
337 RCU_INIT_POINTER(q->vlan, NULL);
338 if (q->enabled)
339 vlan->numvtaps--;
340 vlan->numqueues--;
341 sock_put(&q->sk);
342 }
343 BUG_ON(vlan->numvtaps);
344 BUG_ON(vlan->numqueues);
345 /* guarantee that any future macvtap_set_queue will fail */
346 vlan->numvtaps = MAX_MACVTAP_QUEUES;
347 }
348
349 static rx_handler_result_t macvtap_handle_frame(struct sk_buff **pskb)
350 {
351 struct sk_buff *skb = *pskb;
352 struct net_device *dev = skb->dev;
353 struct macvlan_dev *vlan;
354 struct macvtap_queue *q;
355 netdev_features_t features = TAP_FEATURES;
356
357 vlan = macvtap_get_vlan_rcu(dev);
358 if (!vlan)
359 return RX_HANDLER_PASS;
360
361 q = macvtap_get_queue(dev, skb);
362 if (!q)
363 return RX_HANDLER_PASS;
364
365 if (skb_queue_len(&q->sk.sk_receive_queue) >= dev->tx_queue_len)
366 goto drop;
367
368 skb_push(skb, ETH_HLEN);
369
370 /* Apply the forward feature mask so that we perform segmentation
371 * according to users wishes. This only works if VNET_HDR is
372 * enabled.
373 */
374 if (q->flags & IFF_VNET_HDR)
375 features |= vlan->tap_features;
376 if (netif_needs_gso(skb, features)) {
377 struct sk_buff *segs = __skb_gso_segment(skb, features, false);
378
379 if (IS_ERR(segs))
380 goto drop;
381
382 if (!segs) {
383 skb_queue_tail(&q->sk.sk_receive_queue, skb);
384 goto wake_up;
385 }
386
387 consume_skb(skb);
388 while (segs) {
389 struct sk_buff *nskb = segs->next;
390
391 segs->next = NULL;
392 skb_queue_tail(&q->sk.sk_receive_queue, segs);
393 segs = nskb;
394 }
395 } else {
396 /* If we receive a partial checksum and the tap side
397 * doesn't support checksum offload, compute the checksum.
398 * Note: it doesn't matter which checksum feature to
399 * check, we either support them all or none.
400 */
401 if (skb->ip_summed == CHECKSUM_PARTIAL &&
402 !(features & NETIF_F_CSUM_MASK) &&
403 skb_checksum_help(skb))
404 goto drop;
405 skb_queue_tail(&q->sk.sk_receive_queue, skb);
406 }
407
408 wake_up:
409 wake_up_interruptible_poll(sk_sleep(&q->sk), POLLIN | POLLRDNORM | POLLRDBAND);
410 return RX_HANDLER_CONSUMED;
411
412 drop:
413 /* Count errors/drops only here, thus don't care about args. */
414 macvlan_count_rx(vlan, 0, 0, 0);
415 kfree_skb(skb);
416 return RX_HANDLER_CONSUMED;
417 }
418
419 static int macvtap_get_minor(struct macvlan_dev *vlan)
420 {
421 int retval = -ENOMEM;
422
423 mutex_lock(&minor_lock);
424 retval = idr_alloc(&minor_idr, vlan, 1, MACVTAP_NUM_DEVS, GFP_KERNEL);
425 if (retval >= 0) {
426 vlan->minor = retval;
427 } else if (retval == -ENOSPC) {
428 printk(KERN_ERR "too many macvtap devices\n");
429 retval = -EINVAL;
430 }
431 mutex_unlock(&minor_lock);
432 return retval < 0 ? retval : 0;
433 }
434
435 static void macvtap_free_minor(struct macvlan_dev *vlan)
436 {
437 mutex_lock(&minor_lock);
438 if (vlan->minor) {
439 idr_remove(&minor_idr, vlan->minor);
440 vlan->minor = 0;
441 }
442 mutex_unlock(&minor_lock);
443 }
444
445 static struct net_device *dev_get_by_macvtap_minor(int minor)
446 {
447 struct net_device *dev = NULL;
448 struct macvlan_dev *vlan;
449
450 mutex_lock(&minor_lock);
451 vlan = idr_find(&minor_idr, minor);
452 if (vlan) {
453 dev = vlan->dev;
454 dev_hold(dev);
455 }
456 mutex_unlock(&minor_lock);
457 return dev;
458 }
459
460 static int macvtap_newlink(struct net *src_net,
461 struct net_device *dev,
462 struct nlattr *tb[],
463 struct nlattr *data[])
464 {
465 struct macvlan_dev *vlan = netdev_priv(dev);
466 int err;
467
468 INIT_LIST_HEAD(&vlan->queue_list);
469
470 /* Since macvlan supports all offloads by default, make
471 * tap support all offloads also.
472 */
473 vlan->tap_features = TUN_OFFLOADS;
474
475 err = netdev_rx_handler_register(dev, macvtap_handle_frame, vlan);
476 if (err)
477 return err;
478
479 /* Don't put anything that may fail after macvlan_common_newlink
480 * because we can't undo what it does.
481 */
482 return macvlan_common_newlink(src_net, dev, tb, data);
483 }
484
485 static void macvtap_dellink(struct net_device *dev,
486 struct list_head *head)
487 {
488 netdev_rx_handler_unregister(dev);
489 macvtap_del_queues(dev);
490 macvlan_dellink(dev, head);
491 }
492
493 static void macvtap_setup(struct net_device *dev)
494 {
495 macvlan_common_setup(dev);
496 dev->tx_queue_len = TUN_READQ_SIZE;
497 }
498
499 static struct rtnl_link_ops macvtap_link_ops __read_mostly = {
500 .kind = "macvtap",
501 .setup = macvtap_setup,
502 .newlink = macvtap_newlink,
503 .dellink = macvtap_dellink,
504 };
505
506
507 static void macvtap_sock_write_space(struct sock *sk)
508 {
509 wait_queue_head_t *wqueue;
510
511 if (!sock_writeable(sk) ||
512 !test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags))
513 return;
514
515 wqueue = sk_sleep(sk);
516 if (wqueue && waitqueue_active(wqueue))
517 wake_up_interruptible_poll(wqueue, POLLOUT | POLLWRNORM | POLLWRBAND);
518 }
519
520 static void macvtap_sock_destruct(struct sock *sk)
521 {
522 skb_queue_purge(&sk->sk_receive_queue);
523 }
524
525 static int macvtap_open(struct inode *inode, struct file *file)
526 {
527 struct net *net = current->nsproxy->net_ns;
528 struct net_device *dev;
529 struct macvtap_queue *q;
530 int err = -ENODEV;
531
532 rtnl_lock();
533 dev = dev_get_by_macvtap_minor(iminor(inode));
534 if (!dev)
535 goto out;
536
537 err = -ENOMEM;
538 q = (struct macvtap_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL,
539 &macvtap_proto, 0);
540 if (!q)
541 goto out;
542
543 RCU_INIT_POINTER(q->sock.wq, &q->wq);
544 init_waitqueue_head(&q->wq.wait);
545 q->sock.type = SOCK_RAW;
546 q->sock.state = SS_CONNECTED;
547 q->sock.file = file;
548 q->sock.ops = &macvtap_socket_ops;
549 sock_init_data(&q->sock, &q->sk);
550 q->sk.sk_write_space = macvtap_sock_write_space;
551 q->sk.sk_destruct = macvtap_sock_destruct;
552 q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP;
553 q->vnet_hdr_sz = sizeof(struct virtio_net_hdr);
554
555 /*
556 * so far only KVM virtio_net uses macvtap, enable zero copy between
557 * guest kernel and host kernel when lower device supports zerocopy
558 *
559 * The macvlan supports zerocopy iff the lower device supports zero
560 * copy so we don't have to look at the lower device directly.
561 */
562 if ((dev->features & NETIF_F_HIGHDMA) && (dev->features & NETIF_F_SG))
563 sock_set_flag(&q->sk, SOCK_ZEROCOPY);
564
565 err = macvtap_set_queue(dev, file, q);
566 if (err)
567 sock_put(&q->sk);
568
569 out:
570 if (dev)
571 dev_put(dev);
572
573 rtnl_unlock();
574 return err;
575 }
576
577 static int macvtap_release(struct inode *inode, struct file *file)
578 {
579 struct macvtap_queue *q = file->private_data;
580 macvtap_put_queue(q);
581 return 0;
582 }
583
584 static unsigned int macvtap_poll(struct file *file, poll_table * wait)
585 {
586 struct macvtap_queue *q = file->private_data;
587 unsigned int mask = POLLERR;
588
589 if (!q)
590 goto out;
591
592 mask = 0;
593 poll_wait(file, &q->wq.wait, wait);
594
595 if (!skb_queue_empty(&q->sk.sk_receive_queue))
596 mask |= POLLIN | POLLRDNORM;
597
598 if (sock_writeable(&q->sk) ||
599 (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &q->sock.flags) &&
600 sock_writeable(&q->sk)))
601 mask |= POLLOUT | POLLWRNORM;
602
603 out:
604 return mask;
605 }
606
607 static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad,
608 size_t len, size_t linear,
609 int noblock, int *err)
610 {
611 struct sk_buff *skb;
612
613 /* Under a page? Don't bother with paged skb. */
614 if (prepad + len < PAGE_SIZE || !linear)
615 linear = len;
616
617 skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
618 err, 0);
619 if (!skb)
620 return NULL;
621
622 skb_reserve(skb, prepad);
623 skb_put(skb, linear);
624 skb->data_len = len - linear;
625 skb->len += len - linear;
626
627 return skb;
628 }
629
630 /*
631 * macvtap_skb_from_vnet_hdr and macvtap_skb_to_vnet_hdr should
632 * be shared with the tun/tap driver.
633 */
634 static int macvtap_skb_from_vnet_hdr(struct macvtap_queue *q,
635 struct sk_buff *skb,
636 struct virtio_net_hdr *vnet_hdr)
637 {
638 unsigned short gso_type = 0;
639 if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
640 switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {
641 case VIRTIO_NET_HDR_GSO_TCPV4:
642 gso_type = SKB_GSO_TCPV4;
643 break;
644 case VIRTIO_NET_HDR_GSO_TCPV6:
645 gso_type = SKB_GSO_TCPV6;
646 break;
647 case VIRTIO_NET_HDR_GSO_UDP:
648 gso_type = SKB_GSO_UDP;
649 break;
650 default:
651 return -EINVAL;
652 }
653
654 if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)
655 gso_type |= SKB_GSO_TCP_ECN;
656
657 if (vnet_hdr->gso_size == 0)
658 return -EINVAL;
659 }
660
661 if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
662 if (!skb_partial_csum_set(skb, macvtap16_to_cpu(q, vnet_hdr->csum_start),
663 macvtap16_to_cpu(q, vnet_hdr->csum_offset)))
664 return -EINVAL;
665 }
666
667 if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {
668 skb_shinfo(skb)->gso_size = macvtap16_to_cpu(q, vnet_hdr->gso_size);
669 skb_shinfo(skb)->gso_type = gso_type;
670
671 /* Header must be checked, and gso_segs computed. */
672 skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;
673 skb_shinfo(skb)->gso_segs = 0;
674 }
675 return 0;
676 }
677
678 static void macvtap_skb_to_vnet_hdr(struct macvtap_queue *q,
679 const struct sk_buff *skb,
680 struct virtio_net_hdr *vnet_hdr)
681 {
682 memset(vnet_hdr, 0, sizeof(*vnet_hdr));
683
684 if (skb_is_gso(skb)) {
685 struct skb_shared_info *sinfo = skb_shinfo(skb);
686
687 /* This is a hint as to how much should be linear. */
688 vnet_hdr->hdr_len = cpu_to_macvtap16(q, skb_headlen(skb));
689 vnet_hdr->gso_size = cpu_to_macvtap16(q, sinfo->gso_size);
690 if (sinfo->gso_type & SKB_GSO_TCPV4)
691 vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;
692 else if (sinfo->gso_type & SKB_GSO_TCPV6)
693 vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;
694 else if (sinfo->gso_type & SKB_GSO_UDP)
695 vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;
696 else
697 BUG();
698 if (sinfo->gso_type & SKB_GSO_TCP_ECN)
699 vnet_hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;
700 } else
701 vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;
702
703 if (skb->ip_summed == CHECKSUM_PARTIAL) {
704 vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
705 if (skb_vlan_tag_present(skb))
706 vnet_hdr->csum_start = cpu_to_macvtap16(q,
707 skb_checksum_start_offset(skb) + VLAN_HLEN);
708 else
709 vnet_hdr->csum_start = cpu_to_macvtap16(q,
710 skb_checksum_start_offset(skb));
711 vnet_hdr->csum_offset = cpu_to_macvtap16(q, skb->csum_offset);
712 } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
713 vnet_hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;
714 } /* else everything is zero */
715 }
716
717 /* Neighbour code has some assumptions on HH_DATA_MOD alignment */
718 #define MACVTAP_RESERVE HH_DATA_OFF(ETH_HLEN)
719
720 /* Get packet from user space buffer */
721 static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
722 struct iov_iter *from, int noblock)
723 {
724 int good_linear = SKB_MAX_HEAD(MACVTAP_RESERVE);
725 struct sk_buff *skb;
726 struct macvlan_dev *vlan;
727 unsigned long total_len = iov_iter_count(from);
728 unsigned long len = total_len;
729 int err;
730 struct virtio_net_hdr vnet_hdr = { 0 };
731 int vnet_hdr_len = 0;
732 int copylen = 0;
733 int depth;
734 bool zerocopy = false;
735 size_t linear;
736 ssize_t n;
737
738 if (q->flags & IFF_VNET_HDR) {
739 vnet_hdr_len = q->vnet_hdr_sz;
740
741 err = -EINVAL;
742 if (len < vnet_hdr_len)
743 goto err;
744 len -= vnet_hdr_len;
745
746 err = -EFAULT;
747 n = copy_from_iter(&vnet_hdr, sizeof(vnet_hdr), from);
748 if (n != sizeof(vnet_hdr))
749 goto err;
750 iov_iter_advance(from, vnet_hdr_len - sizeof(vnet_hdr));
751 if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
752 macvtap16_to_cpu(q, vnet_hdr.csum_start) +
753 macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2 >
754 macvtap16_to_cpu(q, vnet_hdr.hdr_len))
755 vnet_hdr.hdr_len = cpu_to_macvtap16(q,
756 macvtap16_to_cpu(q, vnet_hdr.csum_start) +
757 macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2);
758 err = -EINVAL;
759 if (macvtap16_to_cpu(q, vnet_hdr.hdr_len) > len)
760 goto err;
761 }
762
763 err = -EINVAL;
764 if (unlikely(len < ETH_HLEN))
765 goto err;
766
767 if (m && m->msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) {
768 struct iov_iter i;
769
770 copylen = vnet_hdr.hdr_len ?
771 macvtap16_to_cpu(q, vnet_hdr.hdr_len) : GOODCOPY_LEN;
772 if (copylen > good_linear)
773 copylen = good_linear;
774 else if (copylen < ETH_HLEN)
775 copylen = ETH_HLEN;
776 linear = copylen;
777 i = *from;
778 iov_iter_advance(&i, copylen);
779 if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS)
780 zerocopy = true;
781 }
782
783 if (!zerocopy) {
784 copylen = len;
785 linear = macvtap16_to_cpu(q, vnet_hdr.hdr_len);
786 if (linear > good_linear)
787 linear = good_linear;
788 else if (linear < ETH_HLEN)
789 linear = ETH_HLEN;
790 }
791
792 skb = macvtap_alloc_skb(&q->sk, MACVTAP_RESERVE, copylen,
793 linear, noblock, &err);
794 if (!skb)
795 goto err;
796
797 if (zerocopy)
798 err = zerocopy_sg_from_iter(skb, from);
799 else {
800 err = skb_copy_datagram_from_iter(skb, 0, from, len);
801 if (!err && m && m->msg_control) {
802 struct ubuf_info *uarg = m->msg_control;
803 uarg->callback(uarg, false);
804 }
805 }
806
807 if (err)
808 goto err_kfree;
809
810 skb_set_network_header(skb, ETH_HLEN);
811 skb_reset_mac_header(skb);
812 skb->protocol = eth_hdr(skb)->h_proto;
813
814 if (vnet_hdr_len) {
815 err = macvtap_skb_from_vnet_hdr(q, skb, &vnet_hdr);
816 if (err)
817 goto err_kfree;
818 }
819
820 skb_probe_transport_header(skb, ETH_HLEN);
821
822 /* Move network header to the right position for VLAN tagged packets */
823 if ((skb->protocol == htons(ETH_P_8021Q) ||
824 skb->protocol == htons(ETH_P_8021AD)) &&
825 __vlan_get_protocol(skb, skb->protocol, &depth) != 0)
826 skb_set_network_header(skb, depth);
827
828 rcu_read_lock();
829 vlan = rcu_dereference(q->vlan);
830 /* copy skb_ubuf_info for callback when skb has no error */
831 if (zerocopy) {
832 skb_shinfo(skb)->destructor_arg = m->msg_control;
833 skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
834 skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
835 }
836 if (vlan) {
837 skb->dev = vlan->dev;
838 dev_queue_xmit(skb);
839 } else {
840 kfree_skb(skb);
841 }
842 rcu_read_unlock();
843
844 return total_len;
845
846 err_kfree:
847 kfree_skb(skb);
848
849 err:
850 rcu_read_lock();
851 vlan = rcu_dereference(q->vlan);
852 if (vlan)
853 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
854 rcu_read_unlock();
855
856 return err;
857 }
858
859 static ssize_t macvtap_write_iter(struct kiocb *iocb, struct iov_iter *from)
860 {
861 struct file *file = iocb->ki_filp;
862 struct macvtap_queue *q = file->private_data;
863
864 return macvtap_get_user(q, NULL, from, file->f_flags & O_NONBLOCK);
865 }
866
867 /* Put packet to the user space buffer */
868 static ssize_t macvtap_put_user(struct macvtap_queue *q,
869 const struct sk_buff *skb,
870 struct iov_iter *iter)
871 {
872 int ret;
873 int vnet_hdr_len = 0;
874 int vlan_offset = 0;
875 int total;
876
877 if (q->flags & IFF_VNET_HDR) {
878 struct virtio_net_hdr vnet_hdr;
879 vnet_hdr_len = q->vnet_hdr_sz;
880 if (iov_iter_count(iter) < vnet_hdr_len)
881 return -EINVAL;
882
883 macvtap_skb_to_vnet_hdr(q, skb, &vnet_hdr);
884
885 if (copy_to_iter(&vnet_hdr, sizeof(vnet_hdr), iter) !=
886 sizeof(vnet_hdr))
887 return -EFAULT;
888
889 iov_iter_advance(iter, vnet_hdr_len - sizeof(vnet_hdr));
890 }
891 total = vnet_hdr_len;
892 total += skb->len;
893
894 if (skb_vlan_tag_present(skb)) {
895 struct {
896 __be16 h_vlan_proto;
897 __be16 h_vlan_TCI;
898 } veth;
899 veth.h_vlan_proto = skb->vlan_proto;
900 veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb));
901
902 vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto);
903 total += VLAN_HLEN;
904
905 ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset);
906 if (ret || !iov_iter_count(iter))
907 goto done;
908
909 ret = copy_to_iter(&veth, sizeof(veth), iter);
910 if (ret != sizeof(veth) || !iov_iter_count(iter))
911 goto done;
912 }
913
914 ret = skb_copy_datagram_iter(skb, vlan_offset, iter,
915 skb->len - vlan_offset);
916
917 done:
918 return ret ? ret : total;
919 }
920
921 static ssize_t macvtap_do_read(struct macvtap_queue *q,
922 struct iov_iter *to,
923 int noblock)
924 {
925 DEFINE_WAIT(wait);
926 struct sk_buff *skb;
927 ssize_t ret = 0;
928
929 if (!iov_iter_count(to))
930 return 0;
931
932 while (1) {
933 if (!noblock)
934 prepare_to_wait(sk_sleep(&q->sk), &wait,
935 TASK_INTERRUPTIBLE);
936
937 /* Read frames from the queue */
938 skb = skb_dequeue(&q->sk.sk_receive_queue);
939 if (skb)
940 break;
941 if (noblock) {
942 ret = -EAGAIN;
943 break;
944 }
945 if (signal_pending(current)) {
946 ret = -ERESTARTSYS;
947 break;
948 }
949 /* Nothing to read, let's sleep */
950 schedule();
951 }
952 if (!noblock)
953 finish_wait(sk_sleep(&q->sk), &wait);
954
955 if (skb) {
956 ret = macvtap_put_user(q, skb, to);
957 if (unlikely(ret < 0))
958 kfree_skb(skb);
959 else
960 consume_skb(skb);
961 }
962 return ret;
963 }
964
965 static ssize_t macvtap_read_iter(struct kiocb *iocb, struct iov_iter *to)
966 {
967 struct file *file = iocb->ki_filp;
968 struct macvtap_queue *q = file->private_data;
969 ssize_t len = iov_iter_count(to), ret;
970
971 ret = macvtap_do_read(q, to, file->f_flags & O_NONBLOCK);
972 ret = min_t(ssize_t, ret, len);
973 if (ret > 0)
974 iocb->ki_pos = ret;
975 return ret;
976 }
977
978 static struct macvlan_dev *macvtap_get_vlan(struct macvtap_queue *q)
979 {
980 struct macvlan_dev *vlan;
981
982 ASSERT_RTNL();
983 vlan = rtnl_dereference(q->vlan);
984 if (vlan)
985 dev_hold(vlan->dev);
986
987 return vlan;
988 }
989
990 static void macvtap_put_vlan(struct macvlan_dev *vlan)
991 {
992 dev_put(vlan->dev);
993 }
994
995 static int macvtap_ioctl_set_queue(struct file *file, unsigned int flags)
996 {
997 struct macvtap_queue *q = file->private_data;
998 struct macvlan_dev *vlan;
999 int ret;
1000
1001 vlan = macvtap_get_vlan(q);
1002 if (!vlan)
1003 return -EINVAL;
1004
1005 if (flags & IFF_ATTACH_QUEUE)
1006 ret = macvtap_enable_queue(vlan->dev, file, q);
1007 else if (flags & IFF_DETACH_QUEUE)
1008 ret = macvtap_disable_queue(q);
1009 else
1010 ret = -EINVAL;
1011
1012 macvtap_put_vlan(vlan);
1013 return ret;
1014 }
1015
1016 static int set_offload(struct macvtap_queue *q, unsigned long arg)
1017 {
1018 struct macvlan_dev *vlan;
1019 netdev_features_t features;
1020 netdev_features_t feature_mask = 0;
1021
1022 vlan = rtnl_dereference(q->vlan);
1023 if (!vlan)
1024 return -ENOLINK;
1025
1026 features = vlan->dev->features;
1027
1028 if (arg & TUN_F_CSUM) {
1029 feature_mask = NETIF_F_HW_CSUM;
1030
1031 if (arg & (TUN_F_TSO4 | TUN_F_TSO6)) {
1032 if (arg & TUN_F_TSO_ECN)
1033 feature_mask |= NETIF_F_TSO_ECN;
1034 if (arg & TUN_F_TSO4)
1035 feature_mask |= NETIF_F_TSO;
1036 if (arg & TUN_F_TSO6)
1037 feature_mask |= NETIF_F_TSO6;
1038 }
1039
1040 if (arg & TUN_F_UFO)
1041 feature_mask |= NETIF_F_UFO;
1042 }
1043
1044 /* tun/tap driver inverts the usage for TSO offloads, where
1045 * setting the TSO bit means that the userspace wants to
1046 * accept TSO frames and turning it off means that user space
1047 * does not support TSO.
1048 * For macvtap, we have to invert it to mean the same thing.
1049 * When user space turns off TSO, we turn off GSO/LRO so that
1050 * user-space will not receive TSO frames.
1051 */
1052 if (feature_mask & (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_UFO))
1053 features |= RX_OFFLOADS;
1054 else
1055 features &= ~RX_OFFLOADS;
1056
1057 /* tap_features are the same as features on tun/tap and
1058 * reflect user expectations.
1059 */
1060 vlan->tap_features = feature_mask;
1061 vlan->set_features = features;
1062 netdev_update_features(vlan->dev);
1063
1064 return 0;
1065 }
1066
1067 /*
1068 * provide compatibility with generic tun/tap interface
1069 */
1070 static long macvtap_ioctl(struct file *file, unsigned int cmd,
1071 unsigned long arg)
1072 {
1073 struct macvtap_queue *q = file->private_data;
1074 struct macvlan_dev *vlan;
1075 void __user *argp = (void __user *)arg;
1076 struct ifreq __user *ifr = argp;
1077 unsigned int __user *up = argp;
1078 unsigned short u;
1079 int __user *sp = argp;
1080 struct sockaddr sa;
1081 int s;
1082 int ret;
1083
1084 switch (cmd) {
1085 case TUNSETIFF:
1086 /* ignore the name, just look at flags */
1087 if (get_user(u, &ifr->ifr_flags))
1088 return -EFAULT;
1089
1090 ret = 0;
1091 if ((u & ~MACVTAP_FEATURES) != (IFF_NO_PI | IFF_TAP))
1092 ret = -EINVAL;
1093 else
1094 q->flags = (q->flags & ~MACVTAP_FEATURES) | u;
1095
1096 return ret;
1097
1098 case TUNGETIFF:
1099 rtnl_lock();
1100 vlan = macvtap_get_vlan(q);
1101 if (!vlan) {
1102 rtnl_unlock();
1103 return -ENOLINK;
1104 }
1105
1106 ret = 0;
1107 u = q->flags;
1108 if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) ||
1109 put_user(u, &ifr->ifr_flags))
1110 ret = -EFAULT;
1111 macvtap_put_vlan(vlan);
1112 rtnl_unlock();
1113 return ret;
1114
1115 case TUNSETQUEUE:
1116 if (get_user(u, &ifr->ifr_flags))
1117 return -EFAULT;
1118 rtnl_lock();
1119 ret = macvtap_ioctl_set_queue(file, u);
1120 rtnl_unlock();
1121 return ret;
1122
1123 case TUNGETFEATURES:
1124 if (put_user(IFF_TAP | IFF_NO_PI | MACVTAP_FEATURES, up))
1125 return -EFAULT;
1126 return 0;
1127
1128 case TUNSETSNDBUF:
1129 if (get_user(s, sp))
1130 return -EFAULT;
1131
1132 q->sk.sk_sndbuf = s;
1133 return 0;
1134
1135 case TUNGETVNETHDRSZ:
1136 s = q->vnet_hdr_sz;
1137 if (put_user(s, sp))
1138 return -EFAULT;
1139 return 0;
1140
1141 case TUNSETVNETHDRSZ:
1142 if (get_user(s, sp))
1143 return -EFAULT;
1144 if (s < (int)sizeof(struct virtio_net_hdr))
1145 return -EINVAL;
1146
1147 q->vnet_hdr_sz = s;
1148 return 0;
1149
1150 case TUNGETVNETLE:
1151 s = !!(q->flags & MACVTAP_VNET_LE);
1152 if (put_user(s, sp))
1153 return -EFAULT;
1154 return 0;
1155
1156 case TUNSETVNETLE:
1157 if (get_user(s, sp))
1158 return -EFAULT;
1159 if (s)
1160 q->flags |= MACVTAP_VNET_LE;
1161 else
1162 q->flags &= ~MACVTAP_VNET_LE;
1163 return 0;
1164
1165 case TUNGETVNETBE:
1166 return macvtap_get_vnet_be(q, sp);
1167
1168 case TUNSETVNETBE:
1169 return macvtap_set_vnet_be(q, sp);
1170
1171 case TUNSETOFFLOAD:
1172 /* let the user check for future flags */
1173 if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 |
1174 TUN_F_TSO_ECN | TUN_F_UFO))
1175 return -EINVAL;
1176
1177 rtnl_lock();
1178 ret = set_offload(q, arg);
1179 rtnl_unlock();
1180 return ret;
1181
1182 case SIOCGIFHWADDR:
1183 rtnl_lock();
1184 vlan = macvtap_get_vlan(q);
1185 if (!vlan) {
1186 rtnl_unlock();
1187 return -ENOLINK;
1188 }
1189 ret = 0;
1190 u = vlan->dev->type;
1191 if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) ||
1192 copy_to_user(&ifr->ifr_hwaddr.sa_data, vlan->dev->dev_addr, ETH_ALEN) ||
1193 put_user(u, &ifr->ifr_hwaddr.sa_family))
1194 ret = -EFAULT;
1195 macvtap_put_vlan(vlan);
1196 rtnl_unlock();
1197 return ret;
1198
1199 case SIOCSIFHWADDR:
1200 if (copy_from_user(&sa, &ifr->ifr_hwaddr, sizeof(sa)))
1201 return -EFAULT;
1202 rtnl_lock();
1203 vlan = macvtap_get_vlan(q);
1204 if (!vlan) {
1205 rtnl_unlock();
1206 return -ENOLINK;
1207 }
1208 ret = dev_set_mac_address(vlan->dev, &sa);
1209 macvtap_put_vlan(vlan);
1210 rtnl_unlock();
1211 return ret;
1212
1213 default:
1214 return -EINVAL;
1215 }
1216 }
1217
1218 #ifdef CONFIG_COMPAT
1219 static long macvtap_compat_ioctl(struct file *file, unsigned int cmd,
1220 unsigned long arg)
1221 {
1222 return macvtap_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
1223 }
1224 #endif
1225
1226 static const struct file_operations macvtap_fops = {
1227 .owner = THIS_MODULE,
1228 .open = macvtap_open,
1229 .release = macvtap_release,
1230 .read_iter = macvtap_read_iter,
1231 .write_iter = macvtap_write_iter,
1232 .poll = macvtap_poll,
1233 .llseek = no_llseek,
1234 .unlocked_ioctl = macvtap_ioctl,
1235 #ifdef CONFIG_COMPAT
1236 .compat_ioctl = macvtap_compat_ioctl,
1237 #endif
1238 };
1239
1240 static int macvtap_sendmsg(struct socket *sock, struct msghdr *m,
1241 size_t total_len)
1242 {
1243 struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock);
1244 return macvtap_get_user(q, m, &m->msg_iter, m->msg_flags & MSG_DONTWAIT);
1245 }
1246
1247 static int macvtap_recvmsg(struct socket *sock, struct msghdr *m,
1248 size_t total_len, int flags)
1249 {
1250 struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock);
1251 int ret;
1252 if (flags & ~(MSG_DONTWAIT|MSG_TRUNC))
1253 return -EINVAL;
1254 ret = macvtap_do_read(q, &m->msg_iter, flags & MSG_DONTWAIT);
1255 if (ret > total_len) {
1256 m->msg_flags |= MSG_TRUNC;
1257 ret = flags & MSG_TRUNC ? ret : total_len;
1258 }
1259 return ret;
1260 }
1261
1262 /* Ops structure to mimic raw sockets with tun */
1263 static const struct proto_ops macvtap_socket_ops = {
1264 .sendmsg = macvtap_sendmsg,
1265 .recvmsg = macvtap_recvmsg,
1266 };
1267
1268 /* Get an underlying socket object from tun file. Returns error unless file is
1269 * attached to a device. The returned object works like a packet socket, it
1270 * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for
1271 * holding a reference to the file for as long as the socket is in use. */
1272 struct socket *macvtap_get_socket(struct file *file)
1273 {
1274 struct macvtap_queue *q;
1275 if (file->f_op != &macvtap_fops)
1276 return ERR_PTR(-EINVAL);
1277 q = file->private_data;
1278 if (!q)
1279 return ERR_PTR(-EBADFD);
1280 return &q->sock;
1281 }
1282 EXPORT_SYMBOL_GPL(macvtap_get_socket);
1283
1284 static int macvtap_device_event(struct notifier_block *unused,
1285 unsigned long event, void *ptr)
1286 {
1287 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1288 struct macvlan_dev *vlan;
1289 struct device *classdev;
1290 dev_t devt;
1291 int err;
1292 char tap_name[IFNAMSIZ];
1293
1294 if (dev->rtnl_link_ops != &macvtap_link_ops)
1295 return NOTIFY_DONE;
1296
1297 snprintf(tap_name, IFNAMSIZ, "tap%d", dev->ifindex);
1298 vlan = netdev_priv(dev);
1299
1300 switch (event) {
1301 case NETDEV_REGISTER:
1302 /* Create the device node here after the network device has
1303 * been registered but before register_netdevice has
1304 * finished running.
1305 */
1306 err = macvtap_get_minor(vlan);
1307 if (err)
1308 return notifier_from_errno(err);
1309
1310 devt = MKDEV(MAJOR(macvtap_major), vlan->minor);
1311 classdev = device_create(&macvtap_class, &dev->dev, devt,
1312 dev, tap_name);
1313 if (IS_ERR(classdev)) {
1314 macvtap_free_minor(vlan);
1315 return notifier_from_errno(PTR_ERR(classdev));
1316 }
1317 err = sysfs_create_link(&dev->dev.kobj, &classdev->kobj,
1318 tap_name);
1319 if (err)
1320 return notifier_from_errno(err);
1321 break;
1322 case NETDEV_UNREGISTER:
1323 /* vlan->minor == 0 if NETDEV_REGISTER above failed */
1324 if (vlan->minor == 0)
1325 break;
1326 sysfs_remove_link(&dev->dev.kobj, tap_name);
1327 devt = MKDEV(MAJOR(macvtap_major), vlan->minor);
1328 device_destroy(&macvtap_class, devt);
1329 macvtap_free_minor(vlan);
1330 break;
1331 }
1332
1333 return NOTIFY_DONE;
1334 }
1335
1336 static struct notifier_block macvtap_notifier_block __read_mostly = {
1337 .notifier_call = macvtap_device_event,
1338 };
1339
1340 static int macvtap_init(void)
1341 {
1342 int err;
1343
1344 err = alloc_chrdev_region(&macvtap_major, 0,
1345 MACVTAP_NUM_DEVS, "macvtap");
1346 if (err)
1347 goto out1;
1348
1349 cdev_init(&macvtap_cdev, &macvtap_fops);
1350 err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS);
1351 if (err)
1352 goto out2;
1353
1354 err = class_register(&macvtap_class);
1355 if (err)
1356 goto out3;
1357
1358 err = register_netdevice_notifier(&macvtap_notifier_block);
1359 if (err)
1360 goto out4;
1361
1362 err = macvlan_link_register(&macvtap_link_ops);
1363 if (err)
1364 goto out5;
1365
1366 return 0;
1367
1368 out5:
1369 unregister_netdevice_notifier(&macvtap_notifier_block);
1370 out4:
1371 class_unregister(&macvtap_class);
1372 out3:
1373 cdev_del(&macvtap_cdev);
1374 out2:
1375 unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS);
1376 out1:
1377 return err;
1378 }
1379 module_init(macvtap_init);
1380
1381 static void macvtap_exit(void)
1382 {
1383 rtnl_link_unregister(&macvtap_link_ops);
1384 unregister_netdevice_notifier(&macvtap_notifier_block);
1385 class_unregister(&macvtap_class);
1386 cdev_del(&macvtap_cdev);
1387 unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS);
1388 idr_destroy(&minor_idr);
1389 }
1390 module_exit(macvtap_exit);
1391
1392 MODULE_ALIAS_RTNL_LINK("macvtap");
1393 MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>");
1394 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
This page took 0.080246 seconds and 6 git commands to generate.