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Commit | Line | Data |
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20d29d7a AB |
1 | #include <linux/etherdevice.h> |
2 | #include <linux/if_macvlan.h> | |
3 | #include <linux/interrupt.h> | |
4 | #include <linux/nsproxy.h> | |
5 | #include <linux/compat.h> | |
6 | #include <linux/if_tun.h> | |
7 | #include <linux/module.h> | |
8 | #include <linux/skbuff.h> | |
9 | #include <linux/cache.h> | |
10 | #include <linux/sched.h> | |
11 | #include <linux/types.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
20d29d7a AB |
13 | #include <linux/init.h> |
14 | #include <linux/wait.h> | |
15 | #include <linux/cdev.h> | |
16 | #include <linux/fs.h> | |
17 | ||
18 | #include <net/net_namespace.h> | |
19 | #include <net/rtnetlink.h> | |
20 | #include <net/sock.h> | |
b9fb9ee0 | 21 | #include <linux/virtio_net.h> |
20d29d7a AB |
22 | |
23 | /* | |
24 | * A macvtap queue is the central object of this driver, it connects | |
25 | * an open character device to a macvlan interface. There can be | |
26 | * multiple queues on one interface, which map back to queues | |
27 | * implemented in hardware on the underlying device. | |
28 | * | |
29 | * macvtap_proto is used to allocate queues through the sock allocation | |
30 | * mechanism. | |
31 | * | |
32 | * TODO: multiqueue support is currently not implemented, even though | |
33 | * macvtap is basically prepared for that. We will need to add this | |
34 | * here as well as in virtio-net and qemu to get line rate on 10gbit | |
35 | * adapters from a guest. | |
36 | */ | |
37 | struct macvtap_queue { | |
38 | struct sock sk; | |
39 | struct socket sock; | |
43815482 | 40 | struct socket_wq wq; |
55afbd08 | 41 | int vnet_hdr_sz; |
13707f9e | 42 | struct macvlan_dev __rcu *vlan; |
20d29d7a | 43 | struct file *file; |
b9fb9ee0 | 44 | unsigned int flags; |
20d29d7a AB |
45 | }; |
46 | ||
47 | static struct proto macvtap_proto = { | |
48 | .name = "macvtap", | |
49 | .owner = THIS_MODULE, | |
50 | .obj_size = sizeof (struct macvtap_queue), | |
51 | }; | |
52 | ||
53 | /* | |
e09eff7f | 54 | * Variables for dealing with macvtaps device numbers. |
20d29d7a | 55 | */ |
1ebed71a | 56 | static dev_t macvtap_major; |
e09eff7f EB |
57 | #define MACVTAP_NUM_DEVS (1U << MINORBITS) |
58 | static DEFINE_MUTEX(minor_lock); | |
59 | static DEFINE_IDR(minor_idr); | |
60 | ||
97bc3633 | 61 | #define GOODCOPY_LEN 128 |
20d29d7a AB |
62 | static struct class *macvtap_class; |
63 | static struct cdev macvtap_cdev; | |
64 | ||
501c774c AB |
65 | static const struct proto_ops macvtap_socket_ops; |
66 | ||
20d29d7a AB |
67 | /* |
68 | * RCU usage: | |
02df55d2 AB |
69 | * The macvtap_queue and the macvlan_dev are loosely coupled, the |
70 | * pointers from one to the other can only be read while rcu_read_lock | |
71 | * or macvtap_lock is held. | |
20d29d7a | 72 | * |
02df55d2 AB |
73 | * Both the file and the macvlan_dev hold a reference on the macvtap_queue |
74 | * through sock_hold(&q->sk). When the macvlan_dev goes away first, | |
75 | * q->vlan becomes inaccessible. When the files gets closed, | |
76 | * macvtap_get_queue() fails. | |
20d29d7a | 77 | * |
02df55d2 AB |
78 | * There may still be references to the struct sock inside of the |
79 | * queue from outbound SKBs, but these never reference back to the | |
80 | * file or the dev. The data structure is freed through __sk_free | |
81 | * when both our references and any pending SKBs are gone. | |
20d29d7a AB |
82 | */ |
83 | static DEFINE_SPINLOCK(macvtap_lock); | |
84 | ||
85 | /* | |
1565c7c1 KK |
86 | * get_slot: return a [unused/occupied] slot in vlan->taps[]: |
87 | * - if 'q' is NULL, return the first empty slot; | |
88 | * - otherwise, return the slot this pointer occupies. | |
20d29d7a | 89 | */ |
1565c7c1 KK |
90 | static int get_slot(struct macvlan_dev *vlan, struct macvtap_queue *q) |
91 | { | |
92 | int i; | |
93 | ||
94 | for (i = 0; i < MAX_MACVTAP_QUEUES; i++) { | |
95 | if (rcu_dereference(vlan->taps[i]) == q) | |
96 | return i; | |
97 | } | |
98 | ||
99 | /* Should never happen */ | |
100 | BUG_ON(1); | |
101 | } | |
102 | ||
20d29d7a AB |
103 | static int macvtap_set_queue(struct net_device *dev, struct file *file, |
104 | struct macvtap_queue *q) | |
105 | { | |
106 | struct macvlan_dev *vlan = netdev_priv(dev); | |
1565c7c1 | 107 | int index; |
20d29d7a AB |
108 | int err = -EBUSY; |
109 | ||
110 | spin_lock(&macvtap_lock); | |
1565c7c1 | 111 | if (vlan->numvtaps == MAX_MACVTAP_QUEUES) |
20d29d7a AB |
112 | goto out; |
113 | ||
114 | err = 0; | |
1565c7c1 | 115 | index = get_slot(vlan, NULL); |
02df55d2 | 116 | rcu_assign_pointer(q->vlan, vlan); |
1565c7c1 | 117 | rcu_assign_pointer(vlan->taps[index], q); |
02df55d2 | 118 | sock_hold(&q->sk); |
20d29d7a AB |
119 | |
120 | q->file = file; | |
02df55d2 | 121 | file->private_data = q; |
20d29d7a | 122 | |
1565c7c1 KK |
123 | vlan->numvtaps++; |
124 | ||
20d29d7a AB |
125 | out: |
126 | spin_unlock(&macvtap_lock); | |
127 | return err; | |
128 | } | |
129 | ||
130 | /* | |
02df55d2 AB |
131 | * The file owning the queue got closed, give up both |
132 | * the reference that the files holds as well as the | |
133 | * one from the macvlan_dev if that still exists. | |
20d29d7a AB |
134 | * |
135 | * Using the spinlock makes sure that we don't get | |
136 | * to the queue again after destroying it. | |
20d29d7a | 137 | */ |
02df55d2 | 138 | static void macvtap_put_queue(struct macvtap_queue *q) |
20d29d7a | 139 | { |
02df55d2 | 140 | struct macvlan_dev *vlan; |
20d29d7a AB |
141 | |
142 | spin_lock(&macvtap_lock); | |
13707f9e ED |
143 | vlan = rcu_dereference_protected(q->vlan, |
144 | lockdep_is_held(&macvtap_lock)); | |
02df55d2 | 145 | if (vlan) { |
1565c7c1 KK |
146 | int index = get_slot(vlan, q); |
147 | ||
148 | rcu_assign_pointer(vlan->taps[index], NULL); | |
02df55d2 AB |
149 | rcu_assign_pointer(q->vlan, NULL); |
150 | sock_put(&q->sk); | |
1565c7c1 | 151 | --vlan->numvtaps; |
20d29d7a AB |
152 | } |
153 | ||
20d29d7a AB |
154 | spin_unlock(&macvtap_lock); |
155 | ||
156 | synchronize_rcu(); | |
157 | sock_put(&q->sk); | |
158 | } | |
159 | ||
160 | /* | |
1565c7c1 KK |
161 | * Select a queue based on the rxq of the device on which this packet |
162 | * arrived. If the incoming device is not mq, calculate a flow hash | |
163 | * to select a queue. If all fails, find the first available queue. | |
164 | * Cache vlan->numvtaps since it can become zero during the execution | |
165 | * of this function. | |
20d29d7a AB |
166 | */ |
167 | static struct macvtap_queue *macvtap_get_queue(struct net_device *dev, | |
168 | struct sk_buff *skb) | |
169 | { | |
170 | struct macvlan_dev *vlan = netdev_priv(dev); | |
1565c7c1 KK |
171 | struct macvtap_queue *tap = NULL; |
172 | int numvtaps = vlan->numvtaps; | |
173 | __u32 rxq; | |
174 | ||
175 | if (!numvtaps) | |
176 | goto out; | |
177 | ||
178 | if (likely(skb_rx_queue_recorded(skb))) { | |
179 | rxq = skb_get_rx_queue(skb); | |
20d29d7a | 180 | |
1565c7c1 KK |
181 | while (unlikely(rxq >= numvtaps)) |
182 | rxq -= numvtaps; | |
183 | ||
184 | tap = rcu_dereference(vlan->taps[rxq]); | |
185 | if (tap) | |
186 | goto out; | |
187 | } | |
188 | ||
189 | /* Check if we can use flow to select a queue */ | |
190 | rxq = skb_get_rxhash(skb); | |
191 | if (rxq) { | |
192 | tap = rcu_dereference(vlan->taps[rxq % numvtaps]); | |
193 | if (tap) | |
194 | goto out; | |
195 | } | |
196 | ||
197 | /* Everything failed - find first available queue */ | |
198 | for (rxq = 0; rxq < MAX_MACVTAP_QUEUES; rxq++) { | |
199 | tap = rcu_dereference(vlan->taps[rxq]); | |
200 | if (tap) | |
201 | break; | |
202 | } | |
203 | ||
204 | out: | |
205 | return tap; | |
20d29d7a AB |
206 | } |
207 | ||
02df55d2 AB |
208 | /* |
209 | * The net_device is going away, give up the reference | |
1565c7c1 KK |
210 | * that it holds on all queues and safely set the pointer |
211 | * from the queues to NULL. | |
02df55d2 | 212 | */ |
20d29d7a AB |
213 | static void macvtap_del_queues(struct net_device *dev) |
214 | { | |
215 | struct macvlan_dev *vlan = netdev_priv(dev); | |
1565c7c1 KK |
216 | struct macvtap_queue *q, *qlist[MAX_MACVTAP_QUEUES]; |
217 | int i, j = 0; | |
02df55d2 | 218 | |
1565c7c1 | 219 | /* macvtap_put_queue can free some slots, so go through all slots */ |
02df55d2 | 220 | spin_lock(&macvtap_lock); |
1565c7c1 | 221 | for (i = 0; i < MAX_MACVTAP_QUEUES && vlan->numvtaps; i++) { |
13707f9e ED |
222 | q = rcu_dereference_protected(vlan->taps[i], |
223 | lockdep_is_held(&macvtap_lock)); | |
1565c7c1 KK |
224 | if (q) { |
225 | qlist[j++] = q; | |
226 | rcu_assign_pointer(vlan->taps[i], NULL); | |
227 | rcu_assign_pointer(q->vlan, NULL); | |
228 | vlan->numvtaps--; | |
229 | } | |
564517e8 | 230 | } |
1565c7c1 | 231 | BUG_ON(vlan->numvtaps != 0); |
99f34b38 EB |
232 | /* guarantee that any future macvtap_set_queue will fail */ |
233 | vlan->numvtaps = MAX_MACVTAP_QUEUES; | |
02df55d2 AB |
234 | spin_unlock(&macvtap_lock); |
235 | ||
236 | synchronize_rcu(); | |
1565c7c1 KK |
237 | |
238 | for (--j; j >= 0; j--) | |
239 | sock_put(&qlist[j]->sk); | |
20d29d7a AB |
240 | } |
241 | ||
242 | /* | |
243 | * Forward happens for data that gets sent from one macvlan | |
244 | * endpoint to another one in bridge mode. We just take | |
245 | * the skb and put it into the receive queue. | |
246 | */ | |
247 | static int macvtap_forward(struct net_device *dev, struct sk_buff *skb) | |
248 | { | |
249 | struct macvtap_queue *q = macvtap_get_queue(dev, skb); | |
250 | if (!q) | |
8a35747a HX |
251 | goto drop; |
252 | ||
253 | if (skb_queue_len(&q->sk.sk_receive_queue) >= dev->tx_queue_len) | |
254 | goto drop; | |
20d29d7a AB |
255 | |
256 | skb_queue_tail(&q->sk.sk_receive_queue, skb); | |
4a4771a5 | 257 | wake_up_interruptible_poll(sk_sleep(&q->sk), POLLIN | POLLRDNORM | POLLRDBAND); |
8a35747a HX |
258 | return NET_RX_SUCCESS; |
259 | ||
260 | drop: | |
261 | kfree_skb(skb); | |
262 | return NET_RX_DROP; | |
20d29d7a AB |
263 | } |
264 | ||
265 | /* | |
266 | * Receive is for data from the external interface (lowerdev), | |
267 | * in case of macvtap, we can treat that the same way as | |
268 | * forward, which macvlan cannot. | |
269 | */ | |
270 | static int macvtap_receive(struct sk_buff *skb) | |
271 | { | |
272 | skb_push(skb, ETH_HLEN); | |
273 | return macvtap_forward(skb->dev, skb); | |
274 | } | |
275 | ||
e09eff7f EB |
276 | static int macvtap_get_minor(struct macvlan_dev *vlan) |
277 | { | |
278 | int retval = -ENOMEM; | |
279 | int id; | |
280 | ||
281 | mutex_lock(&minor_lock); | |
282 | if (idr_pre_get(&minor_idr, GFP_KERNEL) == 0) | |
283 | goto exit; | |
284 | ||
285 | retval = idr_get_new_above(&minor_idr, vlan, 1, &id); | |
286 | if (retval < 0) { | |
287 | if (retval == -EAGAIN) | |
288 | retval = -ENOMEM; | |
289 | goto exit; | |
290 | } | |
291 | if (id < MACVTAP_NUM_DEVS) { | |
292 | vlan->minor = id; | |
293 | } else { | |
294 | printk(KERN_ERR "too many macvtap devices\n"); | |
295 | retval = -EINVAL; | |
296 | idr_remove(&minor_idr, id); | |
297 | } | |
298 | exit: | |
299 | mutex_unlock(&minor_lock); | |
300 | return retval; | |
301 | } | |
302 | ||
303 | static void macvtap_free_minor(struct macvlan_dev *vlan) | |
304 | { | |
305 | mutex_lock(&minor_lock); | |
306 | if (vlan->minor) { | |
307 | idr_remove(&minor_idr, vlan->minor); | |
308 | vlan->minor = 0; | |
309 | } | |
310 | mutex_unlock(&minor_lock); | |
311 | } | |
312 | ||
313 | static struct net_device *dev_get_by_macvtap_minor(int minor) | |
314 | { | |
315 | struct net_device *dev = NULL; | |
316 | struct macvlan_dev *vlan; | |
317 | ||
318 | mutex_lock(&minor_lock); | |
319 | vlan = idr_find(&minor_idr, minor); | |
320 | if (vlan) { | |
321 | dev = vlan->dev; | |
322 | dev_hold(dev); | |
323 | } | |
324 | mutex_unlock(&minor_lock); | |
325 | return dev; | |
326 | } | |
327 | ||
20d29d7a AB |
328 | static int macvtap_newlink(struct net *src_net, |
329 | struct net_device *dev, | |
330 | struct nlattr *tb[], | |
331 | struct nlattr *data[]) | |
332 | { | |
9bf1907f EB |
333 | /* Don't put anything that may fail after macvlan_common_newlink |
334 | * because we can't undo what it does. | |
335 | */ | |
336 | return macvlan_common_newlink(src_net, dev, tb, data, | |
337 | macvtap_receive, macvtap_forward); | |
20d29d7a AB |
338 | } |
339 | ||
340 | static void macvtap_dellink(struct net_device *dev, | |
341 | struct list_head *head) | |
342 | { | |
20d29d7a AB |
343 | macvtap_del_queues(dev); |
344 | macvlan_dellink(dev, head); | |
345 | } | |
346 | ||
8a35747a HX |
347 | static void macvtap_setup(struct net_device *dev) |
348 | { | |
349 | macvlan_common_setup(dev); | |
350 | dev->tx_queue_len = TUN_READQ_SIZE; | |
351 | } | |
352 | ||
20d29d7a AB |
353 | static struct rtnl_link_ops macvtap_link_ops __read_mostly = { |
354 | .kind = "macvtap", | |
8a35747a | 355 | .setup = macvtap_setup, |
20d29d7a AB |
356 | .newlink = macvtap_newlink, |
357 | .dellink = macvtap_dellink, | |
358 | }; | |
359 | ||
360 | ||
361 | static void macvtap_sock_write_space(struct sock *sk) | |
362 | { | |
43815482 ED |
363 | wait_queue_head_t *wqueue; |
364 | ||
20d29d7a AB |
365 | if (!sock_writeable(sk) || |
366 | !test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) | |
367 | return; | |
368 | ||
43815482 ED |
369 | wqueue = sk_sleep(sk); |
370 | if (wqueue && waitqueue_active(wqueue)) | |
371 | wake_up_interruptible_poll(wqueue, POLLOUT | POLLWRNORM | POLLWRBAND); | |
20d29d7a AB |
372 | } |
373 | ||
2259fef0 EB |
374 | static void macvtap_sock_destruct(struct sock *sk) |
375 | { | |
376 | skb_queue_purge(&sk->sk_receive_queue); | |
377 | } | |
378 | ||
20d29d7a AB |
379 | static int macvtap_open(struct inode *inode, struct file *file) |
380 | { | |
381 | struct net *net = current->nsproxy->net_ns; | |
e09eff7f | 382 | struct net_device *dev = dev_get_by_macvtap_minor(iminor(inode)); |
20d29d7a AB |
383 | struct macvtap_queue *q; |
384 | int err; | |
385 | ||
386 | err = -ENODEV; | |
387 | if (!dev) | |
388 | goto out; | |
389 | ||
20d29d7a AB |
390 | err = -ENOMEM; |
391 | q = (struct macvtap_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, | |
392 | &macvtap_proto); | |
393 | if (!q) | |
394 | goto out; | |
395 | ||
43815482 ED |
396 | q->sock.wq = &q->wq; |
397 | init_waitqueue_head(&q->wq.wait); | |
20d29d7a AB |
398 | q->sock.type = SOCK_RAW; |
399 | q->sock.state = SS_CONNECTED; | |
501c774c AB |
400 | q->sock.file = file; |
401 | q->sock.ops = &macvtap_socket_ops; | |
20d29d7a | 402 | sock_init_data(&q->sock, &q->sk); |
20d29d7a | 403 | q->sk.sk_write_space = macvtap_sock_write_space; |
2259fef0 | 404 | q->sk.sk_destruct = macvtap_sock_destruct; |
b9fb9ee0 | 405 | q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP; |
55afbd08 | 406 | q->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
20d29d7a | 407 | |
97bc3633 SM |
408 | /* |
409 | * so far only KVM virtio_net uses macvtap, enable zero copy between | |
410 | * guest kernel and host kernel when lower device supports zerocopy | |
047af9cf EB |
411 | * |
412 | * The macvlan supports zerocopy iff the lower device supports zero | |
413 | * copy so we don't have to look at the lower device directly. | |
97bc3633 | 414 | */ |
047af9cf EB |
415 | if ((dev->features & NETIF_F_HIGHDMA) && (dev->features & NETIF_F_SG)) |
416 | sock_set_flag(&q->sk, SOCK_ZEROCOPY); | |
97bc3633 | 417 | |
20d29d7a AB |
418 | err = macvtap_set_queue(dev, file, q); |
419 | if (err) | |
420 | sock_put(&q->sk); | |
421 | ||
422 | out: | |
423 | if (dev) | |
424 | dev_put(dev); | |
425 | ||
426 | return err; | |
427 | } | |
428 | ||
429 | static int macvtap_release(struct inode *inode, struct file *file) | |
430 | { | |
02df55d2 AB |
431 | struct macvtap_queue *q = file->private_data; |
432 | macvtap_put_queue(q); | |
20d29d7a AB |
433 | return 0; |
434 | } | |
435 | ||
436 | static unsigned int macvtap_poll(struct file *file, poll_table * wait) | |
437 | { | |
02df55d2 | 438 | struct macvtap_queue *q = file->private_data; |
20d29d7a AB |
439 | unsigned int mask = POLLERR; |
440 | ||
441 | if (!q) | |
442 | goto out; | |
443 | ||
444 | mask = 0; | |
43815482 | 445 | poll_wait(file, &q->wq.wait, wait); |
20d29d7a AB |
446 | |
447 | if (!skb_queue_empty(&q->sk.sk_receive_queue)) | |
448 | mask |= POLLIN | POLLRDNORM; | |
449 | ||
450 | if (sock_writeable(&q->sk) || | |
451 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &q->sock.flags) && | |
452 | sock_writeable(&q->sk))) | |
453 | mask |= POLLOUT | POLLWRNORM; | |
454 | ||
455 | out: | |
20d29d7a AB |
456 | return mask; |
457 | } | |
458 | ||
b9fb9ee0 AB |
459 | static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad, |
460 | size_t len, size_t linear, | |
461 | int noblock, int *err) | |
462 | { | |
463 | struct sk_buff *skb; | |
464 | ||
465 | /* Under a page? Don't bother with paged skb. */ | |
466 | if (prepad + len < PAGE_SIZE || !linear) | |
467 | linear = len; | |
468 | ||
469 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
470 | err); | |
471 | if (!skb) | |
472 | return NULL; | |
473 | ||
474 | skb_reserve(skb, prepad); | |
475 | skb_put(skb, linear); | |
476 | skb->data_len = len - linear; | |
477 | skb->len += len - linear; | |
478 | ||
479 | return skb; | |
480 | } | |
481 | ||
97bc3633 SM |
482 | /* set skb frags from iovec, this can move to core network code for reuse */ |
483 | static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from, | |
484 | int offset, size_t count) | |
485 | { | |
486 | int len = iov_length(from, count) - offset; | |
487 | int copy = skb_headlen(skb); | |
488 | int size, offset1 = 0; | |
489 | int i = 0; | |
97bc3633 SM |
490 | |
491 | /* Skip over from offset */ | |
492 | while (count && (offset >= from->iov_len)) { | |
493 | offset -= from->iov_len; | |
494 | ++from; | |
495 | --count; | |
496 | } | |
497 | ||
498 | /* copy up to skb headlen */ | |
499 | while (count && (copy > 0)) { | |
500 | size = min_t(unsigned int, copy, from->iov_len - offset); | |
501 | if (copy_from_user(skb->data + offset1, from->iov_base + offset, | |
502 | size)) | |
503 | return -EFAULT; | |
504 | if (copy > size) { | |
505 | ++from; | |
506 | --count; | |
507 | } | |
508 | copy -= size; | |
509 | offset1 += size; | |
510 | offset = 0; | |
511 | } | |
512 | ||
513 | if (len == offset1) | |
514 | return 0; | |
515 | ||
516 | while (count--) { | |
517 | struct page *page[MAX_SKB_FRAGS]; | |
518 | int num_pages; | |
519 | unsigned long base; | |
520 | ||
521 | len = from->iov_len - offset1; | |
522 | if (!len) { | |
523 | offset1 = 0; | |
524 | ++from; | |
525 | continue; | |
526 | } | |
527 | base = (unsigned long)from->iov_base + offset1; | |
528 | size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT; | |
529 | num_pages = get_user_pages_fast(base, size, 0, &page[i]); | |
530 | if ((num_pages != size) || | |
531 | (num_pages > MAX_SKB_FRAGS - skb_shinfo(skb)->nr_frags)) | |
532 | /* put_page is in skb free */ | |
533 | return -EFAULT; | |
534 | skb->data_len += len; | |
535 | skb->len += len; | |
536 | skb->truesize += len; | |
537 | atomic_add(len, &skb->sk->sk_wmem_alloc); | |
538 | while (len) { | |
653fc915 JW |
539 | int off = base & ~PAGE_MASK; |
540 | int size = min_t(int, len, PAGE_SIZE - off); | |
541 | __skb_fill_page_desc(skb, i, page[i], off, size); | |
97bc3633 SM |
542 | skb_shinfo(skb)->nr_frags++; |
543 | /* increase sk_wmem_alloc */ | |
653fc915 JW |
544 | base += size; |
545 | len -= size; | |
97bc3633 SM |
546 | i++; |
547 | } | |
548 | offset1 = 0; | |
549 | ++from; | |
550 | } | |
551 | return 0; | |
552 | } | |
553 | ||
b9fb9ee0 AB |
554 | /* |
555 | * macvtap_skb_from_vnet_hdr and macvtap_skb_to_vnet_hdr should | |
556 | * be shared with the tun/tap driver. | |
557 | */ | |
558 | static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb, | |
559 | struct virtio_net_hdr *vnet_hdr) | |
560 | { | |
561 | unsigned short gso_type = 0; | |
562 | if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
563 | switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
564 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
565 | gso_type = SKB_GSO_TCPV4; | |
566 | break; | |
567 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
568 | gso_type = SKB_GSO_TCPV6; | |
569 | break; | |
570 | case VIRTIO_NET_HDR_GSO_UDP: | |
571 | gso_type = SKB_GSO_UDP; | |
572 | break; | |
573 | default: | |
574 | return -EINVAL; | |
575 | } | |
576 | ||
577 | if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
578 | gso_type |= SKB_GSO_TCP_ECN; | |
579 | ||
580 | if (vnet_hdr->gso_size == 0) | |
581 | return -EINVAL; | |
582 | } | |
583 | ||
584 | if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
585 | if (!skb_partial_csum_set(skb, vnet_hdr->csum_start, | |
586 | vnet_hdr->csum_offset)) | |
587 | return -EINVAL; | |
588 | } | |
589 | ||
590 | if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
591 | skb_shinfo(skb)->gso_size = vnet_hdr->gso_size; | |
592 | skb_shinfo(skb)->gso_type = gso_type; | |
593 | ||
594 | /* Header must be checked, and gso_segs computed. */ | |
595 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
596 | skb_shinfo(skb)->gso_segs = 0; | |
597 | } | |
598 | return 0; | |
599 | } | |
600 | ||
601 | static int macvtap_skb_to_vnet_hdr(const struct sk_buff *skb, | |
602 | struct virtio_net_hdr *vnet_hdr) | |
603 | { | |
604 | memset(vnet_hdr, 0, sizeof(*vnet_hdr)); | |
605 | ||
606 | if (skb_is_gso(skb)) { | |
607 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
608 | ||
609 | /* This is a hint as to how much should be linear. */ | |
610 | vnet_hdr->hdr_len = skb_headlen(skb); | |
611 | vnet_hdr->gso_size = sinfo->gso_size; | |
612 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
613 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
614 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
615 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
616 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
617 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
618 | else | |
619 | BUG(); | |
620 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
621 | vnet_hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
622 | } else | |
623 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
624 | ||
625 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
626 | vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 627 | vnet_hdr->csum_start = skb_checksum_start_offset(skb); |
b9fb9ee0 | 628 | vnet_hdr->csum_offset = skb->csum_offset; |
10a8d94a JW |
629 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
630 | vnet_hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
b9fb9ee0 AB |
631 | } /* else everything is zero */ |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
636 | ||
20d29d7a | 637 | /* Get packet from user space buffer */ |
97bc3633 SM |
638 | static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, |
639 | const struct iovec *iv, unsigned long total_len, | |
640 | size_t count, int noblock) | |
20d29d7a AB |
641 | { |
642 | struct sk_buff *skb; | |
02df55d2 | 643 | struct macvlan_dev *vlan; |
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; | |
97bc3633 SM |
648 | int copylen; |
649 | bool zerocopy = false; | |
b9fb9ee0 AB |
650 | |
651 | if (q->flags & IFF_VNET_HDR) { | |
55afbd08 | 652 | vnet_hdr_len = q->vnet_hdr_sz; |
b9fb9ee0 AB |
653 | |
654 | err = -EINVAL; | |
ce3c8692 | 655 | if (len < vnet_hdr_len) |
b9fb9ee0 | 656 | goto err; |
ce3c8692 | 657 | len -= vnet_hdr_len; |
b9fb9ee0 AB |
658 | |
659 | err = memcpy_fromiovecend((void *)&vnet_hdr, iv, 0, | |
55afbd08 | 660 | sizeof(vnet_hdr)); |
b9fb9ee0 AB |
661 | if (err < 0) |
662 | goto err; | |
663 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
664 | vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > | |
665 | vnet_hdr.hdr_len) | |
666 | vnet_hdr.hdr_len = vnet_hdr.csum_start + | |
667 | vnet_hdr.csum_offset + 2; | |
668 | err = -EINVAL; | |
669 | if (vnet_hdr.hdr_len > len) | |
670 | goto err; | |
671 | } | |
20d29d7a | 672 | |
b9fb9ee0 | 673 | err = -EINVAL; |
20d29d7a | 674 | if (unlikely(len < ETH_HLEN)) |
b9fb9ee0 | 675 | goto err; |
20d29d7a | 676 | |
97bc3633 SM |
677 | if (m && m->msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) |
678 | zerocopy = true; | |
679 | ||
680 | if (zerocopy) { | |
681 | /* There are 256 bytes to be copied in skb, so there is enough | |
682 | * room for skb expand head in case it is used. | |
683 | * The rest buffer is mapped from userspace. | |
684 | */ | |
685 | copylen = vnet_hdr.hdr_len; | |
686 | if (!copylen) | |
687 | copylen = GOODCOPY_LEN; | |
688 | } else | |
689 | copylen = len; | |
690 | ||
691 | skb = macvtap_alloc_skb(&q->sk, NET_IP_ALIGN, copylen, | |
692 | vnet_hdr.hdr_len, noblock, &err); | |
02df55d2 AB |
693 | if (!skb) |
694 | goto err; | |
20d29d7a | 695 | |
97bc3633 SM |
696 | if (zerocopy) { |
697 | err = zerocopy_sg_from_iovec(skb, iv, vnet_hdr_len, count); | |
698 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
699 | } else | |
700 | err = skb_copy_datagram_from_iovec(skb, 0, iv, vnet_hdr_len, | |
701 | len); | |
02df55d2 | 702 | if (err) |
b9fb9ee0 | 703 | goto err_kfree; |
20d29d7a AB |
704 | |
705 | skb_set_network_header(skb, ETH_HLEN); | |
b9fb9ee0 AB |
706 | skb_reset_mac_header(skb); |
707 | skb->protocol = eth_hdr(skb)->h_proto; | |
708 | ||
709 | if (vnet_hdr_len) { | |
710 | err = macvtap_skb_from_vnet_hdr(skb, &vnet_hdr); | |
711 | if (err) | |
712 | goto err_kfree; | |
713 | } | |
714 | ||
02df55d2 | 715 | rcu_read_lock_bh(); |
13707f9e | 716 | vlan = rcu_dereference_bh(q->vlan); |
97bc3633 SM |
717 | /* copy skb_ubuf_info for callback when skb has no error */ |
718 | if (zerocopy) | |
719 | skb_shinfo(skb)->destructor_arg = m->msg_control; | |
02df55d2 AB |
720 | if (vlan) |
721 | macvlan_start_xmit(skb, vlan->dev); | |
722 | else | |
723 | kfree_skb(skb); | |
724 | rcu_read_unlock_bh(); | |
20d29d7a | 725 | |
97bc3633 | 726 | return total_len; |
02df55d2 | 727 | |
b9fb9ee0 AB |
728 | err_kfree: |
729 | kfree_skb(skb); | |
730 | ||
02df55d2 AB |
731 | err: |
732 | rcu_read_lock_bh(); | |
13707f9e | 733 | vlan = rcu_dereference_bh(q->vlan); |
02df55d2 | 734 | if (vlan) |
1ac9ad13 | 735 | vlan->dev->stats.tx_dropped++; |
02df55d2 AB |
736 | rcu_read_unlock_bh(); |
737 | ||
02df55d2 | 738 | return err; |
20d29d7a AB |
739 | } |
740 | ||
741 | static ssize_t macvtap_aio_write(struct kiocb *iocb, const struct iovec *iv, | |
742 | unsigned long count, loff_t pos) | |
743 | { | |
744 | struct file *file = iocb->ki_filp; | |
745 | ssize_t result = -ENOLINK; | |
02df55d2 | 746 | struct macvtap_queue *q = file->private_data; |
20d29d7a | 747 | |
97bc3633 SM |
748 | result = macvtap_get_user(q, NULL, iv, iov_length(iv, count), count, |
749 | file->f_flags & O_NONBLOCK); | |
20d29d7a AB |
750 | return result; |
751 | } | |
752 | ||
753 | /* Put packet to the user space buffer */ | |
754 | static ssize_t macvtap_put_user(struct macvtap_queue *q, | |
755 | const struct sk_buff *skb, | |
756 | const struct iovec *iv, int len) | |
757 | { | |
02df55d2 | 758 | struct macvlan_dev *vlan; |
20d29d7a | 759 | int ret; |
b9fb9ee0 AB |
760 | int vnet_hdr_len = 0; |
761 | ||
762 | if (q->flags & IFF_VNET_HDR) { | |
763 | struct virtio_net_hdr vnet_hdr; | |
55afbd08 | 764 | vnet_hdr_len = q->vnet_hdr_sz; |
b9fb9ee0 AB |
765 | if ((len -= vnet_hdr_len) < 0) |
766 | return -EINVAL; | |
767 | ||
768 | ret = macvtap_skb_to_vnet_hdr(skb, &vnet_hdr); | |
769 | if (ret) | |
770 | return ret; | |
771 | ||
55afbd08 | 772 | if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0, sizeof(vnet_hdr))) |
b9fb9ee0 AB |
773 | return -EFAULT; |
774 | } | |
20d29d7a AB |
775 | |
776 | len = min_t(int, skb->len, len); | |
777 | ||
b9fb9ee0 | 778 | ret = skb_copy_datagram_const_iovec(skb, 0, iv, vnet_hdr_len, len); |
20d29d7a | 779 | |
02df55d2 | 780 | rcu_read_lock_bh(); |
13707f9e | 781 | vlan = rcu_dereference_bh(q->vlan); |
501c774c AB |
782 | if (vlan) |
783 | macvlan_count_rx(vlan, len, ret == 0, 0); | |
02df55d2 | 784 | rcu_read_unlock_bh(); |
20d29d7a | 785 | |
b9fb9ee0 | 786 | return ret ? ret : (len + vnet_hdr_len); |
20d29d7a AB |
787 | } |
788 | ||
501c774c AB |
789 | static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb, |
790 | const struct iovec *iv, unsigned long len, | |
791 | int noblock) | |
20d29d7a | 792 | { |
20d29d7a AB |
793 | DECLARE_WAITQUEUE(wait, current); |
794 | struct sk_buff *skb; | |
501c774c | 795 | ssize_t ret = 0; |
20d29d7a | 796 | |
4a4771a5 | 797 | add_wait_queue(sk_sleep(&q->sk), &wait); |
20d29d7a AB |
798 | while (len) { |
799 | current->state = TASK_INTERRUPTIBLE; | |
800 | ||
801 | /* Read frames from the queue */ | |
802 | skb = skb_dequeue(&q->sk.sk_receive_queue); | |
803 | if (!skb) { | |
501c774c | 804 | if (noblock) { |
20d29d7a AB |
805 | ret = -EAGAIN; |
806 | break; | |
807 | } | |
808 | if (signal_pending(current)) { | |
809 | ret = -ERESTARTSYS; | |
810 | break; | |
811 | } | |
812 | /* Nothing to read, let's sleep */ | |
813 | schedule(); | |
814 | continue; | |
815 | } | |
816 | ret = macvtap_put_user(q, skb, iv, len); | |
817 | kfree_skb(skb); | |
818 | break; | |
819 | } | |
820 | ||
821 | current->state = TASK_RUNNING; | |
4a4771a5 | 822 | remove_wait_queue(sk_sleep(&q->sk), &wait); |
501c774c AB |
823 | return ret; |
824 | } | |
825 | ||
826 | static ssize_t macvtap_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
827 | unsigned long count, loff_t pos) | |
828 | { | |
829 | struct file *file = iocb->ki_filp; | |
830 | struct macvtap_queue *q = file->private_data; | |
831 | ssize_t len, ret = 0; | |
20d29d7a | 832 | |
501c774c AB |
833 | len = iov_length(iv, count); |
834 | if (len < 0) { | |
835 | ret = -EINVAL; | |
836 | goto out; | |
837 | } | |
838 | ||
839 | ret = macvtap_do_read(q, iocb, iv, len, file->f_flags & O_NONBLOCK); | |
840 | ret = min_t(ssize_t, ret, len); /* XXX copied from tun.c. Why? */ | |
20d29d7a | 841 | out: |
20d29d7a AB |
842 | return ret; |
843 | } | |
844 | ||
845 | /* | |
846 | * provide compatibility with generic tun/tap interface | |
847 | */ | |
848 | static long macvtap_ioctl(struct file *file, unsigned int cmd, | |
849 | unsigned long arg) | |
850 | { | |
02df55d2 AB |
851 | struct macvtap_queue *q = file->private_data; |
852 | struct macvlan_dev *vlan; | |
20d29d7a AB |
853 | void __user *argp = (void __user *)arg; |
854 | struct ifreq __user *ifr = argp; | |
855 | unsigned int __user *up = argp; | |
856 | unsigned int u; | |
55afbd08 MT |
857 | int __user *sp = argp; |
858 | int s; | |
02df55d2 | 859 | int ret; |
20d29d7a AB |
860 | |
861 | switch (cmd) { | |
862 | case TUNSETIFF: | |
863 | /* ignore the name, just look at flags */ | |
864 | if (get_user(u, &ifr->ifr_flags)) | |
865 | return -EFAULT; | |
b9fb9ee0 AB |
866 | |
867 | ret = 0; | |
868 | if ((u & ~IFF_VNET_HDR) != (IFF_NO_PI | IFF_TAP)) | |
869 | ret = -EINVAL; | |
870 | else | |
871 | q->flags = u; | |
872 | ||
873 | return ret; | |
20d29d7a AB |
874 | |
875 | case TUNGETIFF: | |
02df55d2 | 876 | rcu_read_lock_bh(); |
13707f9e | 877 | vlan = rcu_dereference_bh(q->vlan); |
02df55d2 AB |
878 | if (vlan) |
879 | dev_hold(vlan->dev); | |
880 | rcu_read_unlock_bh(); | |
881 | ||
882 | if (!vlan) | |
20d29d7a | 883 | return -ENOLINK; |
20d29d7a | 884 | |
02df55d2 | 885 | ret = 0; |
13707f9e | 886 | if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) || |
b9fb9ee0 | 887 | put_user(q->flags, &ifr->ifr_flags)) |
02df55d2 AB |
888 | ret = -EFAULT; |
889 | dev_put(vlan->dev); | |
890 | return ret; | |
20d29d7a AB |
891 | |
892 | case TUNGETFEATURES: | |
b9fb9ee0 | 893 | if (put_user(IFF_TAP | IFF_NO_PI | IFF_VNET_HDR, up)) |
20d29d7a AB |
894 | return -EFAULT; |
895 | return 0; | |
896 | ||
897 | case TUNSETSNDBUF: | |
898 | if (get_user(u, up)) | |
899 | return -EFAULT; | |
900 | ||
20d29d7a | 901 | q->sk.sk_sndbuf = u; |
20d29d7a AB |
902 | return 0; |
903 | ||
55afbd08 MT |
904 | case TUNGETVNETHDRSZ: |
905 | s = q->vnet_hdr_sz; | |
906 | if (put_user(s, sp)) | |
907 | return -EFAULT; | |
908 | return 0; | |
909 | ||
910 | case TUNSETVNETHDRSZ: | |
911 | if (get_user(s, sp)) | |
912 | return -EFAULT; | |
913 | if (s < (int)sizeof(struct virtio_net_hdr)) | |
914 | return -EINVAL; | |
915 | ||
916 | q->vnet_hdr_sz = s; | |
917 | return 0; | |
918 | ||
20d29d7a AB |
919 | case TUNSETOFFLOAD: |
920 | /* let the user check for future flags */ | |
921 | if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | | |
b9fb9ee0 | 922 | TUN_F_TSO_ECN | TUN_F_UFO)) |
20d29d7a AB |
923 | return -EINVAL; |
924 | ||
b9fb9ee0 AB |
925 | /* TODO: only accept frames with the features that |
926 | got enabled for forwarded frames */ | |
927 | if (!(q->flags & IFF_VNET_HDR)) | |
928 | return -EINVAL; | |
20d29d7a AB |
929 | return 0; |
930 | ||
931 | default: | |
932 | return -EINVAL; | |
933 | } | |
934 | } | |
935 | ||
936 | #ifdef CONFIG_COMPAT | |
937 | static long macvtap_compat_ioctl(struct file *file, unsigned int cmd, | |
938 | unsigned long arg) | |
939 | { | |
940 | return macvtap_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
941 | } | |
942 | #endif | |
943 | ||
944 | static const struct file_operations macvtap_fops = { | |
945 | .owner = THIS_MODULE, | |
946 | .open = macvtap_open, | |
947 | .release = macvtap_release, | |
948 | .aio_read = macvtap_aio_read, | |
949 | .aio_write = macvtap_aio_write, | |
950 | .poll = macvtap_poll, | |
951 | .llseek = no_llseek, | |
952 | .unlocked_ioctl = macvtap_ioctl, | |
953 | #ifdef CONFIG_COMPAT | |
954 | .compat_ioctl = macvtap_compat_ioctl, | |
955 | #endif | |
956 | }; | |
957 | ||
501c774c AB |
958 | static int macvtap_sendmsg(struct kiocb *iocb, struct socket *sock, |
959 | struct msghdr *m, size_t total_len) | |
960 | { | |
961 | struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock); | |
97bc3633 | 962 | return macvtap_get_user(q, m, m->msg_iov, total_len, m->msg_iovlen, |
501c774c AB |
963 | m->msg_flags & MSG_DONTWAIT); |
964 | } | |
965 | ||
966 | static int macvtap_recvmsg(struct kiocb *iocb, struct socket *sock, | |
967 | struct msghdr *m, size_t total_len, | |
968 | int flags) | |
969 | { | |
970 | struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock); | |
971 | int ret; | |
972 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) | |
973 | return -EINVAL; | |
974 | ret = macvtap_do_read(q, iocb, m->msg_iov, total_len, | |
975 | flags & MSG_DONTWAIT); | |
976 | if (ret > total_len) { | |
977 | m->msg_flags |= MSG_TRUNC; | |
978 | ret = flags & MSG_TRUNC ? ret : total_len; | |
979 | } | |
980 | return ret; | |
981 | } | |
982 | ||
983 | /* Ops structure to mimic raw sockets with tun */ | |
984 | static const struct proto_ops macvtap_socket_ops = { | |
985 | .sendmsg = macvtap_sendmsg, | |
986 | .recvmsg = macvtap_recvmsg, | |
987 | }; | |
988 | ||
989 | /* Get an underlying socket object from tun file. Returns error unless file is | |
990 | * attached to a device. The returned object works like a packet socket, it | |
991 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
992 | * holding a reference to the file for as long as the socket is in use. */ | |
993 | struct socket *macvtap_get_socket(struct file *file) | |
994 | { | |
995 | struct macvtap_queue *q; | |
996 | if (file->f_op != &macvtap_fops) | |
997 | return ERR_PTR(-EINVAL); | |
998 | q = file->private_data; | |
999 | if (!q) | |
1000 | return ERR_PTR(-EBADFD); | |
1001 | return &q->sock; | |
1002 | } | |
1003 | EXPORT_SYMBOL_GPL(macvtap_get_socket); | |
1004 | ||
9bf1907f EB |
1005 | static int macvtap_device_event(struct notifier_block *unused, |
1006 | unsigned long event, void *ptr) | |
1007 | { | |
1008 | struct net_device *dev = ptr; | |
e09eff7f | 1009 | struct macvlan_dev *vlan; |
9bf1907f EB |
1010 | struct device *classdev; |
1011 | dev_t devt; | |
e09eff7f | 1012 | int err; |
9bf1907f EB |
1013 | |
1014 | if (dev->rtnl_link_ops != &macvtap_link_ops) | |
1015 | return NOTIFY_DONE; | |
1016 | ||
e09eff7f | 1017 | vlan = netdev_priv(dev); |
9bf1907f EB |
1018 | |
1019 | switch (event) { | |
1020 | case NETDEV_REGISTER: | |
1021 | /* Create the device node here after the network device has | |
1022 | * been registered but before register_netdevice has | |
1023 | * finished running. | |
1024 | */ | |
e09eff7f EB |
1025 | err = macvtap_get_minor(vlan); |
1026 | if (err) | |
1027 | return notifier_from_errno(err); | |
1028 | ||
1029 | devt = MKDEV(MAJOR(macvtap_major), vlan->minor); | |
9bf1907f EB |
1030 | classdev = device_create(macvtap_class, &dev->dev, devt, |
1031 | dev, "tap%d", dev->ifindex); | |
e09eff7f EB |
1032 | if (IS_ERR(classdev)) { |
1033 | macvtap_free_minor(vlan); | |
9bf1907f | 1034 | return notifier_from_errno(PTR_ERR(classdev)); |
e09eff7f | 1035 | } |
9bf1907f EB |
1036 | break; |
1037 | case NETDEV_UNREGISTER: | |
e09eff7f | 1038 | devt = MKDEV(MAJOR(macvtap_major), vlan->minor); |
9bf1907f | 1039 | device_destroy(macvtap_class, devt); |
e09eff7f | 1040 | macvtap_free_minor(vlan); |
9bf1907f EB |
1041 | break; |
1042 | } | |
1043 | ||
1044 | return NOTIFY_DONE; | |
1045 | } | |
1046 | ||
1047 | static struct notifier_block macvtap_notifier_block __read_mostly = { | |
1048 | .notifier_call = macvtap_device_event, | |
1049 | }; | |
1050 | ||
20d29d7a AB |
1051 | static int macvtap_init(void) |
1052 | { | |
1053 | int err; | |
1054 | ||
1055 | err = alloc_chrdev_region(&macvtap_major, 0, | |
1056 | MACVTAP_NUM_DEVS, "macvtap"); | |
1057 | if (err) | |
1058 | goto out1; | |
1059 | ||
1060 | cdev_init(&macvtap_cdev, &macvtap_fops); | |
1061 | err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS); | |
1062 | if (err) | |
1063 | goto out2; | |
1064 | ||
1065 | macvtap_class = class_create(THIS_MODULE, "macvtap"); | |
1066 | if (IS_ERR(macvtap_class)) { | |
1067 | err = PTR_ERR(macvtap_class); | |
1068 | goto out3; | |
1069 | } | |
1070 | ||
9bf1907f | 1071 | err = register_netdevice_notifier(&macvtap_notifier_block); |
20d29d7a AB |
1072 | if (err) |
1073 | goto out4; | |
1074 | ||
9bf1907f EB |
1075 | err = macvlan_link_register(&macvtap_link_ops); |
1076 | if (err) | |
1077 | goto out5; | |
1078 | ||
20d29d7a AB |
1079 | return 0; |
1080 | ||
9bf1907f EB |
1081 | out5: |
1082 | unregister_netdevice_notifier(&macvtap_notifier_block); | |
20d29d7a AB |
1083 | out4: |
1084 | class_unregister(macvtap_class); | |
1085 | out3: | |
1086 | cdev_del(&macvtap_cdev); | |
1087 | out2: | |
1088 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); | |
1089 | out1: | |
1090 | return err; | |
1091 | } | |
1092 | module_init(macvtap_init); | |
1093 | ||
1094 | static void macvtap_exit(void) | |
1095 | { | |
1096 | rtnl_link_unregister(&macvtap_link_ops); | |
9bf1907f | 1097 | unregister_netdevice_notifier(&macvtap_notifier_block); |
20d29d7a AB |
1098 | class_unregister(macvtap_class); |
1099 | cdev_del(&macvtap_cdev); | |
1100 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); | |
1101 | } | |
1102 | module_exit(macvtap_exit); | |
1103 | ||
1104 | MODULE_ALIAS_RTNL_LINK("macvtap"); | |
1105 | MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); | |
1106 | MODULE_LICENSE("GPL"); |