Commit | Line | Data |
---|---|---|
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> | |
40401530 | 16 | #include <linux/idr.h> |
20d29d7a AB |
17 | #include <linux/fs.h> |
18 | ||
19 | #include <net/net_namespace.h> | |
20 | #include <net/rtnetlink.h> | |
21 | #include <net/sock.h> | |
b9fb9ee0 | 22 | #include <linux/virtio_net.h> |
20d29d7a AB |
23 | |
24 | /* | |
25 | * A macvtap queue is the central object of this driver, it connects | |
26 | * an open character device to a macvlan interface. There can be | |
27 | * multiple queues on one interface, which map back to queues | |
28 | * implemented in hardware on the underlying device. | |
29 | * | |
30 | * macvtap_proto is used to allocate queues through the sock allocation | |
31 | * mechanism. | |
32 | * | |
33 | * TODO: multiqueue support is currently not implemented, even though | |
34 | * macvtap is basically prepared for that. We will need to add this | |
35 | * here as well as in virtio-net and qemu to get line rate on 10gbit | |
36 | * adapters from a guest. | |
37 | */ | |
38 | struct macvtap_queue { | |
39 | struct sock sk; | |
40 | struct socket sock; | |
43815482 | 41 | struct socket_wq wq; |
55afbd08 | 42 | int vnet_hdr_sz; |
13707f9e | 43 | struct macvlan_dev __rcu *vlan; |
20d29d7a | 44 | struct file *file; |
b9fb9ee0 | 45 | unsigned int flags; |
20d29d7a AB |
46 | }; |
47 | ||
48 | static struct proto macvtap_proto = { | |
49 | .name = "macvtap", | |
50 | .owner = THIS_MODULE, | |
51 | .obj_size = sizeof (struct macvtap_queue), | |
52 | }; | |
53 | ||
54 | /* | |
e09eff7f | 55 | * Variables for dealing with macvtaps device numbers. |
20d29d7a | 56 | */ |
1ebed71a | 57 | static dev_t macvtap_major; |
e09eff7f EB |
58 | #define MACVTAP_NUM_DEVS (1U << MINORBITS) |
59 | static DEFINE_MUTEX(minor_lock); | |
60 | static DEFINE_IDR(minor_idr); | |
61 | ||
97bc3633 | 62 | #define GOODCOPY_LEN 128 |
20d29d7a AB |
63 | static struct class *macvtap_class; |
64 | static struct cdev macvtap_cdev; | |
65 | ||
501c774c AB |
66 | static const struct proto_ops macvtap_socket_ops; |
67 | ||
20d29d7a AB |
68 | /* |
69 | * RCU usage: | |
02df55d2 AB |
70 | * The macvtap_queue and the macvlan_dev are loosely coupled, the |
71 | * pointers from one to the other can only be read while rcu_read_lock | |
72 | * or macvtap_lock is held. | |
20d29d7a | 73 | * |
02df55d2 AB |
74 | * Both the file and the macvlan_dev hold a reference on the macvtap_queue |
75 | * through sock_hold(&q->sk). When the macvlan_dev goes away first, | |
76 | * q->vlan becomes inaccessible. When the files gets closed, | |
77 | * macvtap_get_queue() fails. | |
20d29d7a | 78 | * |
02df55d2 AB |
79 | * There may still be references to the struct sock inside of the |
80 | * queue from outbound SKBs, but these never reference back to the | |
81 | * file or the dev. The data structure is freed through __sk_free | |
82 | * when both our references and any pending SKBs are gone. | |
20d29d7a AB |
83 | */ |
84 | static DEFINE_SPINLOCK(macvtap_lock); | |
85 | ||
86 | /* | |
1565c7c1 KK |
87 | * get_slot: return a [unused/occupied] slot in vlan->taps[]: |
88 | * - if 'q' is NULL, return the first empty slot; | |
89 | * - otherwise, return the slot this pointer occupies. | |
20d29d7a | 90 | */ |
1565c7c1 KK |
91 | static int get_slot(struct macvlan_dev *vlan, struct macvtap_queue *q) |
92 | { | |
93 | int i; | |
94 | ||
95 | for (i = 0; i < MAX_MACVTAP_QUEUES; i++) { | |
96 | if (rcu_dereference(vlan->taps[i]) == q) | |
97 | return i; | |
98 | } | |
99 | ||
100 | /* Should never happen */ | |
101 | BUG_ON(1); | |
102 | } | |
103 | ||
20d29d7a AB |
104 | static int macvtap_set_queue(struct net_device *dev, struct file *file, |
105 | struct macvtap_queue *q) | |
106 | { | |
107 | struct macvlan_dev *vlan = netdev_priv(dev); | |
1565c7c1 | 108 | int index; |
20d29d7a AB |
109 | int err = -EBUSY; |
110 | ||
111 | spin_lock(&macvtap_lock); | |
1565c7c1 | 112 | if (vlan->numvtaps == MAX_MACVTAP_QUEUES) |
20d29d7a AB |
113 | goto out; |
114 | ||
115 | err = 0; | |
1565c7c1 | 116 | index = get_slot(vlan, NULL); |
02df55d2 | 117 | rcu_assign_pointer(q->vlan, vlan); |
1565c7c1 | 118 | rcu_assign_pointer(vlan->taps[index], q); |
02df55d2 | 119 | sock_hold(&q->sk); |
20d29d7a AB |
120 | |
121 | q->file = file; | |
02df55d2 | 122 | file->private_data = q; |
20d29d7a | 123 | |
1565c7c1 KK |
124 | vlan->numvtaps++; |
125 | ||
20d29d7a AB |
126 | out: |
127 | spin_unlock(&macvtap_lock); | |
128 | return err; | |
129 | } | |
130 | ||
131 | /* | |
02df55d2 AB |
132 | * The file owning the queue got closed, give up both |
133 | * the reference that the files holds as well as the | |
134 | * one from the macvlan_dev if that still exists. | |
20d29d7a AB |
135 | * |
136 | * Using the spinlock makes sure that we don't get | |
137 | * to the queue again after destroying it. | |
20d29d7a | 138 | */ |
02df55d2 | 139 | static void macvtap_put_queue(struct macvtap_queue *q) |
20d29d7a | 140 | { |
02df55d2 | 141 | struct macvlan_dev *vlan; |
20d29d7a AB |
142 | |
143 | spin_lock(&macvtap_lock); | |
13707f9e ED |
144 | vlan = rcu_dereference_protected(q->vlan, |
145 | lockdep_is_held(&macvtap_lock)); | |
02df55d2 | 146 | if (vlan) { |
1565c7c1 KK |
147 | int index = get_slot(vlan, q); |
148 | ||
2cfa5a04 ED |
149 | RCU_INIT_POINTER(vlan->taps[index], NULL); |
150 | RCU_INIT_POINTER(q->vlan, NULL); | |
02df55d2 | 151 | sock_put(&q->sk); |
1565c7c1 | 152 | --vlan->numvtaps; |
20d29d7a AB |
153 | } |
154 | ||
20d29d7a AB |
155 | spin_unlock(&macvtap_lock); |
156 | ||
157 | synchronize_rcu(); | |
158 | sock_put(&q->sk); | |
159 | } | |
160 | ||
161 | /* | |
1565c7c1 KK |
162 | * Select a queue based on the rxq of the device on which this packet |
163 | * arrived. If the incoming device is not mq, calculate a flow hash | |
164 | * to select a queue. If all fails, find the first available queue. | |
165 | * Cache vlan->numvtaps since it can become zero during the execution | |
166 | * of this function. | |
20d29d7a AB |
167 | */ |
168 | static struct macvtap_queue *macvtap_get_queue(struct net_device *dev, | |
169 | struct sk_buff *skb) | |
170 | { | |
171 | struct macvlan_dev *vlan = netdev_priv(dev); | |
1565c7c1 KK |
172 | struct macvtap_queue *tap = NULL; |
173 | int numvtaps = vlan->numvtaps; | |
174 | __u32 rxq; | |
175 | ||
176 | if (!numvtaps) | |
177 | goto out; | |
178 | ||
ef0002b5 KK |
179 | /* Check if we can use flow to select a queue */ |
180 | rxq = skb_get_rxhash(skb); | |
181 | if (rxq) { | |
182 | tap = rcu_dereference(vlan->taps[rxq % numvtaps]); | |
183 | if (tap) | |
184 | goto out; | |
185 | } | |
186 | ||
1565c7c1 KK |
187 | if (likely(skb_rx_queue_recorded(skb))) { |
188 | rxq = skb_get_rx_queue(skb); | |
20d29d7a | 189 | |
1565c7c1 KK |
190 | while (unlikely(rxq >= numvtaps)) |
191 | rxq -= numvtaps; | |
192 | ||
193 | tap = rcu_dereference(vlan->taps[rxq]); | |
194 | if (tap) | |
195 | goto out; | |
196 | } | |
197 | ||
1565c7c1 KK |
198 | /* Everything failed - find first available queue */ |
199 | for (rxq = 0; rxq < MAX_MACVTAP_QUEUES; rxq++) { | |
200 | tap = rcu_dereference(vlan->taps[rxq]); | |
201 | if (tap) | |
202 | break; | |
203 | } | |
204 | ||
205 | out: | |
206 | return tap; | |
20d29d7a AB |
207 | } |
208 | ||
02df55d2 AB |
209 | /* |
210 | * The net_device is going away, give up the reference | |
1565c7c1 KK |
211 | * that it holds on all queues and safely set the pointer |
212 | * from the queues to NULL. | |
02df55d2 | 213 | */ |
20d29d7a AB |
214 | static void macvtap_del_queues(struct net_device *dev) |
215 | { | |
216 | struct macvlan_dev *vlan = netdev_priv(dev); | |
1565c7c1 KK |
217 | struct macvtap_queue *q, *qlist[MAX_MACVTAP_QUEUES]; |
218 | int i, j = 0; | |
02df55d2 | 219 | |
1565c7c1 | 220 | /* macvtap_put_queue can free some slots, so go through all slots */ |
02df55d2 | 221 | spin_lock(&macvtap_lock); |
1565c7c1 | 222 | for (i = 0; i < MAX_MACVTAP_QUEUES && vlan->numvtaps; i++) { |
13707f9e ED |
223 | q = rcu_dereference_protected(vlan->taps[i], |
224 | lockdep_is_held(&macvtap_lock)); | |
1565c7c1 KK |
225 | if (q) { |
226 | qlist[j++] = q; | |
2cfa5a04 ED |
227 | RCU_INIT_POINTER(vlan->taps[i], NULL); |
228 | RCU_INIT_POINTER(q->vlan, NULL); | |
1565c7c1 KK |
229 | vlan->numvtaps--; |
230 | } | |
564517e8 | 231 | } |
1565c7c1 | 232 | BUG_ON(vlan->numvtaps != 0); |
99f34b38 EB |
233 | /* guarantee that any future macvtap_set_queue will fail */ |
234 | vlan->numvtaps = MAX_MACVTAP_QUEUES; | |
02df55d2 AB |
235 | spin_unlock(&macvtap_lock); |
236 | ||
237 | synchronize_rcu(); | |
1565c7c1 KK |
238 | |
239 | for (--j; j >= 0; j--) | |
240 | sock_put(&qlist[j]->sk); | |
20d29d7a AB |
241 | } |
242 | ||
243 | /* | |
244 | * Forward happens for data that gets sent from one macvlan | |
245 | * endpoint to another one in bridge mode. We just take | |
246 | * the skb and put it into the receive queue. | |
247 | */ | |
248 | static int macvtap_forward(struct net_device *dev, struct sk_buff *skb) | |
249 | { | |
250 | struct macvtap_queue *q = macvtap_get_queue(dev, skb); | |
251 | if (!q) | |
8a35747a HX |
252 | goto drop; |
253 | ||
254 | if (skb_queue_len(&q->sk.sk_receive_queue) >= dev->tx_queue_len) | |
255 | goto drop; | |
20d29d7a AB |
256 | |
257 | skb_queue_tail(&q->sk.sk_receive_queue, skb); | |
4a4771a5 | 258 | wake_up_interruptible_poll(sk_sleep(&q->sk), POLLIN | POLLRDNORM | POLLRDBAND); |
8a35747a HX |
259 | return NET_RX_SUCCESS; |
260 | ||
261 | drop: | |
262 | kfree_skb(skb); | |
263 | return NET_RX_DROP; | |
20d29d7a AB |
264 | } |
265 | ||
266 | /* | |
267 | * Receive is for data from the external interface (lowerdev), | |
268 | * in case of macvtap, we can treat that the same way as | |
269 | * forward, which macvlan cannot. | |
270 | */ | |
271 | static int macvtap_receive(struct sk_buff *skb) | |
272 | { | |
273 | skb_push(skb, ETH_HLEN); | |
274 | return macvtap_forward(skb->dev, skb); | |
275 | } | |
276 | ||
e09eff7f EB |
277 | static int macvtap_get_minor(struct macvlan_dev *vlan) |
278 | { | |
279 | int retval = -ENOMEM; | |
280 | int id; | |
281 | ||
282 | mutex_lock(&minor_lock); | |
283 | if (idr_pre_get(&minor_idr, GFP_KERNEL) == 0) | |
284 | goto exit; | |
285 | ||
286 | retval = idr_get_new_above(&minor_idr, vlan, 1, &id); | |
287 | if (retval < 0) { | |
288 | if (retval == -EAGAIN) | |
289 | retval = -ENOMEM; | |
290 | goto exit; | |
291 | } | |
292 | if (id < MACVTAP_NUM_DEVS) { | |
293 | vlan->minor = id; | |
294 | } else { | |
295 | printk(KERN_ERR "too many macvtap devices\n"); | |
296 | retval = -EINVAL; | |
297 | idr_remove(&minor_idr, id); | |
298 | } | |
299 | exit: | |
300 | mutex_unlock(&minor_lock); | |
301 | return retval; | |
302 | } | |
303 | ||
304 | static void macvtap_free_minor(struct macvlan_dev *vlan) | |
305 | { | |
306 | mutex_lock(&minor_lock); | |
307 | if (vlan->minor) { | |
308 | idr_remove(&minor_idr, vlan->minor); | |
309 | vlan->minor = 0; | |
310 | } | |
311 | mutex_unlock(&minor_lock); | |
312 | } | |
313 | ||
314 | static struct net_device *dev_get_by_macvtap_minor(int minor) | |
315 | { | |
316 | struct net_device *dev = NULL; | |
317 | struct macvlan_dev *vlan; | |
318 | ||
319 | mutex_lock(&minor_lock); | |
320 | vlan = idr_find(&minor_idr, minor); | |
321 | if (vlan) { | |
322 | dev = vlan->dev; | |
323 | dev_hold(dev); | |
324 | } | |
325 | mutex_unlock(&minor_lock); | |
326 | return dev; | |
327 | } | |
328 | ||
20d29d7a AB |
329 | static int macvtap_newlink(struct net *src_net, |
330 | struct net_device *dev, | |
331 | struct nlattr *tb[], | |
332 | struct nlattr *data[]) | |
333 | { | |
9bf1907f EB |
334 | /* Don't put anything that may fail after macvlan_common_newlink |
335 | * because we can't undo what it does. | |
336 | */ | |
337 | return macvlan_common_newlink(src_net, dev, tb, data, | |
338 | macvtap_receive, macvtap_forward); | |
20d29d7a AB |
339 | } |
340 | ||
341 | static void macvtap_dellink(struct net_device *dev, | |
342 | struct list_head *head) | |
343 | { | |
20d29d7a AB |
344 | macvtap_del_queues(dev); |
345 | macvlan_dellink(dev, head); | |
346 | } | |
347 | ||
8a35747a HX |
348 | static void macvtap_setup(struct net_device *dev) |
349 | { | |
350 | macvlan_common_setup(dev); | |
351 | dev->tx_queue_len = TUN_READQ_SIZE; | |
352 | } | |
353 | ||
20d29d7a AB |
354 | static struct rtnl_link_ops macvtap_link_ops __read_mostly = { |
355 | .kind = "macvtap", | |
8a35747a | 356 | .setup = macvtap_setup, |
20d29d7a AB |
357 | .newlink = macvtap_newlink, |
358 | .dellink = macvtap_dellink, | |
359 | }; | |
360 | ||
361 | ||
362 | static void macvtap_sock_write_space(struct sock *sk) | |
363 | { | |
43815482 ED |
364 | wait_queue_head_t *wqueue; |
365 | ||
20d29d7a AB |
366 | if (!sock_writeable(sk) || |
367 | !test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) | |
368 | return; | |
369 | ||
43815482 ED |
370 | wqueue = sk_sleep(sk); |
371 | if (wqueue && waitqueue_active(wqueue)) | |
372 | wake_up_interruptible_poll(wqueue, POLLOUT | POLLWRNORM | POLLWRBAND); | |
20d29d7a AB |
373 | } |
374 | ||
2259fef0 EB |
375 | static void macvtap_sock_destruct(struct sock *sk) |
376 | { | |
377 | skb_queue_purge(&sk->sk_receive_queue); | |
378 | } | |
379 | ||
20d29d7a AB |
380 | static int macvtap_open(struct inode *inode, struct file *file) |
381 | { | |
382 | struct net *net = current->nsproxy->net_ns; | |
e09eff7f | 383 | struct net_device *dev = dev_get_by_macvtap_minor(iminor(inode)); |
20d29d7a AB |
384 | struct macvtap_queue *q; |
385 | int err; | |
386 | ||
387 | err = -ENODEV; | |
388 | if (!dev) | |
389 | goto out; | |
390 | ||
20d29d7a AB |
391 | err = -ENOMEM; |
392 | q = (struct macvtap_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, | |
393 | &macvtap_proto); | |
394 | if (!q) | |
395 | goto out; | |
396 | ||
43815482 ED |
397 | q->sock.wq = &q->wq; |
398 | init_waitqueue_head(&q->wq.wait); | |
20d29d7a AB |
399 | q->sock.type = SOCK_RAW; |
400 | q->sock.state = SS_CONNECTED; | |
501c774c AB |
401 | q->sock.file = file; |
402 | q->sock.ops = &macvtap_socket_ops; | |
20d29d7a | 403 | sock_init_data(&q->sock, &q->sk); |
20d29d7a | 404 | q->sk.sk_write_space = macvtap_sock_write_space; |
2259fef0 | 405 | q->sk.sk_destruct = macvtap_sock_destruct; |
b9fb9ee0 | 406 | q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP; |
55afbd08 | 407 | q->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
20d29d7a | 408 | |
97bc3633 SM |
409 | /* |
410 | * so far only KVM virtio_net uses macvtap, enable zero copy between | |
411 | * guest kernel and host kernel when lower device supports zerocopy | |
047af9cf EB |
412 | * |
413 | * The macvlan supports zerocopy iff the lower device supports zero | |
414 | * copy so we don't have to look at the lower device directly. | |
97bc3633 | 415 | */ |
047af9cf EB |
416 | if ((dev->features & NETIF_F_HIGHDMA) && (dev->features & NETIF_F_SG)) |
417 | sock_set_flag(&q->sk, SOCK_ZEROCOPY); | |
97bc3633 | 418 | |
20d29d7a AB |
419 | err = macvtap_set_queue(dev, file, q); |
420 | if (err) | |
421 | sock_put(&q->sk); | |
422 | ||
423 | out: | |
424 | if (dev) | |
425 | dev_put(dev); | |
426 | ||
427 | return err; | |
428 | } | |
429 | ||
430 | static int macvtap_release(struct inode *inode, struct file *file) | |
431 | { | |
02df55d2 AB |
432 | struct macvtap_queue *q = file->private_data; |
433 | macvtap_put_queue(q); | |
20d29d7a AB |
434 | return 0; |
435 | } | |
436 | ||
437 | static unsigned int macvtap_poll(struct file *file, poll_table * wait) | |
438 | { | |
02df55d2 | 439 | struct macvtap_queue *q = file->private_data; |
20d29d7a AB |
440 | unsigned int mask = POLLERR; |
441 | ||
442 | if (!q) | |
443 | goto out; | |
444 | ||
445 | mask = 0; | |
43815482 | 446 | poll_wait(file, &q->wq.wait, wait); |
20d29d7a AB |
447 | |
448 | if (!skb_queue_empty(&q->sk.sk_receive_queue)) | |
449 | mask |= POLLIN | POLLRDNORM; | |
450 | ||
451 | if (sock_writeable(&q->sk) || | |
452 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &q->sock.flags) && | |
453 | sock_writeable(&q->sk))) | |
454 | mask |= POLLOUT | POLLWRNORM; | |
455 | ||
456 | out: | |
20d29d7a AB |
457 | return mask; |
458 | } | |
459 | ||
b9fb9ee0 AB |
460 | static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad, |
461 | size_t len, size_t linear, | |
462 | int noblock, int *err) | |
463 | { | |
464 | struct sk_buff *skb; | |
465 | ||
466 | /* Under a page? Don't bother with paged skb. */ | |
467 | if (prepad + len < PAGE_SIZE || !linear) | |
468 | linear = len; | |
469 | ||
470 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, | |
471 | err); | |
472 | if (!skb) | |
473 | return NULL; | |
474 | ||
475 | skb_reserve(skb, prepad); | |
476 | skb_put(skb, linear); | |
477 | skb->data_len = len - linear; | |
478 | skb->len += len - linear; | |
479 | ||
480 | return skb; | |
481 | } | |
482 | ||
97bc3633 SM |
483 | /* set skb frags from iovec, this can move to core network code for reuse */ |
484 | static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from, | |
485 | int offset, size_t count) | |
486 | { | |
487 | int len = iov_length(from, count) - offset; | |
488 | int copy = skb_headlen(skb); | |
489 | int size, offset1 = 0; | |
490 | int i = 0; | |
97bc3633 SM |
491 | |
492 | /* Skip over from offset */ | |
493 | while (count && (offset >= from->iov_len)) { | |
494 | offset -= from->iov_len; | |
495 | ++from; | |
496 | --count; | |
497 | } | |
498 | ||
499 | /* copy up to skb headlen */ | |
500 | while (count && (copy > 0)) { | |
501 | size = min_t(unsigned int, copy, from->iov_len - offset); | |
502 | if (copy_from_user(skb->data + offset1, from->iov_base + offset, | |
503 | size)) | |
504 | return -EFAULT; | |
505 | if (copy > size) { | |
506 | ++from; | |
507 | --count; | |
508 | } | |
509 | copy -= size; | |
510 | offset1 += size; | |
511 | offset = 0; | |
512 | } | |
513 | ||
514 | if (len == offset1) | |
515 | return 0; | |
516 | ||
517 | while (count--) { | |
518 | struct page *page[MAX_SKB_FRAGS]; | |
519 | int num_pages; | |
520 | unsigned long base; | |
521 | ||
522 | len = from->iov_len - offset1; | |
523 | if (!len) { | |
524 | offset1 = 0; | |
525 | ++from; | |
526 | continue; | |
527 | } | |
528 | base = (unsigned long)from->iov_base + offset1; | |
529 | size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT; | |
530 | num_pages = get_user_pages_fast(base, size, 0, &page[i]); | |
531 | if ((num_pages != size) || | |
532 | (num_pages > MAX_SKB_FRAGS - skb_shinfo(skb)->nr_frags)) | |
533 | /* put_page is in skb free */ | |
534 | return -EFAULT; | |
535 | skb->data_len += len; | |
536 | skb->len += len; | |
537 | skb->truesize += len; | |
538 | atomic_add(len, &skb->sk->sk_wmem_alloc); | |
539 | while (len) { | |
653fc915 JW |
540 | int off = base & ~PAGE_MASK; |
541 | int size = min_t(int, len, PAGE_SIZE - off); | |
542 | __skb_fill_page_desc(skb, i, page[i], off, size); | |
97bc3633 SM |
543 | skb_shinfo(skb)->nr_frags++; |
544 | /* increase sk_wmem_alloc */ | |
653fc915 JW |
545 | base += size; |
546 | len -= size; | |
97bc3633 SM |
547 | i++; |
548 | } | |
549 | offset1 = 0; | |
550 | ++from; | |
551 | } | |
552 | return 0; | |
553 | } | |
554 | ||
b9fb9ee0 AB |
555 | /* |
556 | * macvtap_skb_from_vnet_hdr and macvtap_skb_to_vnet_hdr should | |
557 | * be shared with the tun/tap driver. | |
558 | */ | |
559 | static int macvtap_skb_from_vnet_hdr(struct sk_buff *skb, | |
560 | struct virtio_net_hdr *vnet_hdr) | |
561 | { | |
562 | unsigned short gso_type = 0; | |
563 | if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
564 | switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
565 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
566 | gso_type = SKB_GSO_TCPV4; | |
567 | break; | |
568 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
569 | gso_type = SKB_GSO_TCPV6; | |
570 | break; | |
571 | case VIRTIO_NET_HDR_GSO_UDP: | |
572 | gso_type = SKB_GSO_UDP; | |
573 | break; | |
574 | default: | |
575 | return -EINVAL; | |
576 | } | |
577 | ||
578 | if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
579 | gso_type |= SKB_GSO_TCP_ECN; | |
580 | ||
581 | if (vnet_hdr->gso_size == 0) | |
582 | return -EINVAL; | |
583 | } | |
584 | ||
585 | if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { | |
586 | if (!skb_partial_csum_set(skb, vnet_hdr->csum_start, | |
587 | vnet_hdr->csum_offset)) | |
588 | return -EINVAL; | |
589 | } | |
590 | ||
591 | if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) { | |
592 | skb_shinfo(skb)->gso_size = vnet_hdr->gso_size; | |
593 | skb_shinfo(skb)->gso_type = gso_type; | |
594 | ||
595 | /* Header must be checked, and gso_segs computed. */ | |
596 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
597 | skb_shinfo(skb)->gso_segs = 0; | |
598 | } | |
599 | return 0; | |
600 | } | |
601 | ||
602 | static int macvtap_skb_to_vnet_hdr(const struct sk_buff *skb, | |
603 | struct virtio_net_hdr *vnet_hdr) | |
604 | { | |
605 | memset(vnet_hdr, 0, sizeof(*vnet_hdr)); | |
606 | ||
607 | if (skb_is_gso(skb)) { | |
608 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
609 | ||
610 | /* This is a hint as to how much should be linear. */ | |
611 | vnet_hdr->hdr_len = skb_headlen(skb); | |
612 | vnet_hdr->gso_size = sinfo->gso_size; | |
613 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
614 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
615 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
616 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
617 | else if (sinfo->gso_type & SKB_GSO_UDP) | |
618 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
619 | else | |
620 | BUG(); | |
621 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
622 | vnet_hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
623 | } else | |
624 | vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
625 | ||
626 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
627 | vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 628 | vnet_hdr->csum_start = skb_checksum_start_offset(skb); |
b9fb9ee0 | 629 | vnet_hdr->csum_offset = skb->csum_offset; |
10a8d94a JW |
630 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
631 | vnet_hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
b9fb9ee0 AB |
632 | } /* else everything is zero */ |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
637 | ||
20d29d7a | 638 | /* Get packet from user space buffer */ |
97bc3633 SM |
639 | static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, |
640 | const struct iovec *iv, unsigned long total_len, | |
641 | size_t count, int noblock) | |
20d29d7a AB |
642 | { |
643 | struct sk_buff *skb; | |
02df55d2 | 644 | struct macvlan_dev *vlan; |
97bc3633 | 645 | unsigned long len = total_len; |
20d29d7a | 646 | int err; |
b9fb9ee0 AB |
647 | struct virtio_net_hdr vnet_hdr = { 0 }; |
648 | int vnet_hdr_len = 0; | |
97bc3633 SM |
649 | int copylen; |
650 | bool zerocopy = false; | |
b9fb9ee0 AB |
651 | |
652 | if (q->flags & IFF_VNET_HDR) { | |
55afbd08 | 653 | vnet_hdr_len = q->vnet_hdr_sz; |
b9fb9ee0 AB |
654 | |
655 | err = -EINVAL; | |
ce3c8692 | 656 | if (len < vnet_hdr_len) |
b9fb9ee0 | 657 | goto err; |
ce3c8692 | 658 | len -= vnet_hdr_len; |
b9fb9ee0 AB |
659 | |
660 | err = memcpy_fromiovecend((void *)&vnet_hdr, iv, 0, | |
55afbd08 | 661 | sizeof(vnet_hdr)); |
b9fb9ee0 AB |
662 | if (err < 0) |
663 | goto err; | |
664 | if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && | |
665 | vnet_hdr.csum_start + vnet_hdr.csum_offset + 2 > | |
666 | vnet_hdr.hdr_len) | |
667 | vnet_hdr.hdr_len = vnet_hdr.csum_start + | |
668 | vnet_hdr.csum_offset + 2; | |
669 | err = -EINVAL; | |
670 | if (vnet_hdr.hdr_len > len) | |
671 | goto err; | |
672 | } | |
20d29d7a | 673 | |
b9fb9ee0 | 674 | err = -EINVAL; |
20d29d7a | 675 | if (unlikely(len < ETH_HLEN)) |
b9fb9ee0 | 676 | goto err; |
20d29d7a | 677 | |
97bc3633 SM |
678 | if (m && m->msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) |
679 | zerocopy = true; | |
680 | ||
681 | if (zerocopy) { | |
682 | /* There are 256 bytes to be copied in skb, so there is enough | |
683 | * room for skb expand head in case it is used. | |
684 | * The rest buffer is mapped from userspace. | |
685 | */ | |
686 | copylen = vnet_hdr.hdr_len; | |
687 | if (!copylen) | |
688 | copylen = GOODCOPY_LEN; | |
689 | } else | |
690 | copylen = len; | |
691 | ||
692 | skb = macvtap_alloc_skb(&q->sk, NET_IP_ALIGN, copylen, | |
693 | vnet_hdr.hdr_len, noblock, &err); | |
02df55d2 AB |
694 | if (!skb) |
695 | goto err; | |
20d29d7a | 696 | |
97bc3633 SM |
697 | if (zerocopy) { |
698 | err = zerocopy_sg_from_iovec(skb, iv, vnet_hdr_len, count); | |
699 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
700 | } else | |
701 | err = skb_copy_datagram_from_iovec(skb, 0, iv, vnet_hdr_len, | |
702 | len); | |
02df55d2 | 703 | if (err) |
b9fb9ee0 | 704 | goto err_kfree; |
20d29d7a AB |
705 | |
706 | skb_set_network_header(skb, ETH_HLEN); | |
b9fb9ee0 AB |
707 | skb_reset_mac_header(skb); |
708 | skb->protocol = eth_hdr(skb)->h_proto; | |
709 | ||
710 | if (vnet_hdr_len) { | |
711 | err = macvtap_skb_from_vnet_hdr(skb, &vnet_hdr); | |
712 | if (err) | |
713 | goto err_kfree; | |
714 | } | |
715 | ||
02df55d2 | 716 | rcu_read_lock_bh(); |
13707f9e | 717 | vlan = rcu_dereference_bh(q->vlan); |
97bc3633 SM |
718 | /* copy skb_ubuf_info for callback when skb has no error */ |
719 | if (zerocopy) | |
720 | skb_shinfo(skb)->destructor_arg = m->msg_control; | |
02df55d2 AB |
721 | if (vlan) |
722 | macvlan_start_xmit(skb, vlan->dev); | |
723 | else | |
724 | kfree_skb(skb); | |
725 | rcu_read_unlock_bh(); | |
20d29d7a | 726 | |
97bc3633 | 727 | return total_len; |
02df55d2 | 728 | |
b9fb9ee0 AB |
729 | err_kfree: |
730 | kfree_skb(skb); | |
731 | ||
02df55d2 AB |
732 | err: |
733 | rcu_read_lock_bh(); | |
13707f9e | 734 | vlan = rcu_dereference_bh(q->vlan); |
02df55d2 | 735 | if (vlan) |
1ac9ad13 | 736 | vlan->dev->stats.tx_dropped++; |
02df55d2 AB |
737 | rcu_read_unlock_bh(); |
738 | ||
02df55d2 | 739 | return err; |
20d29d7a AB |
740 | } |
741 | ||
742 | static ssize_t macvtap_aio_write(struct kiocb *iocb, const struct iovec *iv, | |
743 | unsigned long count, loff_t pos) | |
744 | { | |
745 | struct file *file = iocb->ki_filp; | |
746 | ssize_t result = -ENOLINK; | |
02df55d2 | 747 | struct macvtap_queue *q = file->private_data; |
20d29d7a | 748 | |
97bc3633 SM |
749 | result = macvtap_get_user(q, NULL, iv, iov_length(iv, count), count, |
750 | file->f_flags & O_NONBLOCK); | |
20d29d7a AB |
751 | return result; |
752 | } | |
753 | ||
754 | /* Put packet to the user space buffer */ | |
755 | static ssize_t macvtap_put_user(struct macvtap_queue *q, | |
756 | const struct sk_buff *skb, | |
757 | const struct iovec *iv, int len) | |
758 | { | |
02df55d2 | 759 | struct macvlan_dev *vlan; |
20d29d7a | 760 | int ret; |
b9fb9ee0 AB |
761 | int vnet_hdr_len = 0; |
762 | ||
763 | if (q->flags & IFF_VNET_HDR) { | |
764 | struct virtio_net_hdr vnet_hdr; | |
55afbd08 | 765 | vnet_hdr_len = q->vnet_hdr_sz; |
b9fb9ee0 AB |
766 | if ((len -= vnet_hdr_len) < 0) |
767 | return -EINVAL; | |
768 | ||
769 | ret = macvtap_skb_to_vnet_hdr(skb, &vnet_hdr); | |
770 | if (ret) | |
771 | return ret; | |
772 | ||
55afbd08 | 773 | if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0, sizeof(vnet_hdr))) |
b9fb9ee0 AB |
774 | return -EFAULT; |
775 | } | |
20d29d7a AB |
776 | |
777 | len = min_t(int, skb->len, len); | |
778 | ||
b9fb9ee0 | 779 | ret = skb_copy_datagram_const_iovec(skb, 0, iv, vnet_hdr_len, len); |
20d29d7a | 780 | |
02df55d2 | 781 | rcu_read_lock_bh(); |
13707f9e | 782 | vlan = rcu_dereference_bh(q->vlan); |
501c774c AB |
783 | if (vlan) |
784 | macvlan_count_rx(vlan, len, ret == 0, 0); | |
02df55d2 | 785 | rcu_read_unlock_bh(); |
20d29d7a | 786 | |
b9fb9ee0 | 787 | return ret ? ret : (len + vnet_hdr_len); |
20d29d7a AB |
788 | } |
789 | ||
501c774c AB |
790 | static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb, |
791 | const struct iovec *iv, unsigned long len, | |
792 | int noblock) | |
20d29d7a | 793 | { |
20d29d7a AB |
794 | DECLARE_WAITQUEUE(wait, current); |
795 | struct sk_buff *skb; | |
501c774c | 796 | ssize_t ret = 0; |
20d29d7a | 797 | |
4a4771a5 | 798 | add_wait_queue(sk_sleep(&q->sk), &wait); |
20d29d7a AB |
799 | while (len) { |
800 | current->state = TASK_INTERRUPTIBLE; | |
801 | ||
802 | /* Read frames from the queue */ | |
803 | skb = skb_dequeue(&q->sk.sk_receive_queue); | |
804 | if (!skb) { | |
501c774c | 805 | if (noblock) { |
20d29d7a AB |
806 | ret = -EAGAIN; |
807 | break; | |
808 | } | |
809 | if (signal_pending(current)) { | |
810 | ret = -ERESTARTSYS; | |
811 | break; | |
812 | } | |
813 | /* Nothing to read, let's sleep */ | |
814 | schedule(); | |
815 | continue; | |
816 | } | |
817 | ret = macvtap_put_user(q, skb, iv, len); | |
818 | kfree_skb(skb); | |
819 | break; | |
820 | } | |
821 | ||
822 | current->state = TASK_RUNNING; | |
4a4771a5 | 823 | remove_wait_queue(sk_sleep(&q->sk), &wait); |
501c774c AB |
824 | return ret; |
825 | } | |
826 | ||
827 | static ssize_t macvtap_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
828 | unsigned long count, loff_t pos) | |
829 | { | |
830 | struct file *file = iocb->ki_filp; | |
831 | struct macvtap_queue *q = file->private_data; | |
832 | ssize_t len, ret = 0; | |
20d29d7a | 833 | |
501c774c AB |
834 | len = iov_length(iv, count); |
835 | if (len < 0) { | |
836 | ret = -EINVAL; | |
837 | goto out; | |
838 | } | |
839 | ||
840 | ret = macvtap_do_read(q, iocb, iv, len, file->f_flags & O_NONBLOCK); | |
841 | ret = min_t(ssize_t, ret, len); /* XXX copied from tun.c. Why? */ | |
20d29d7a | 842 | out: |
20d29d7a AB |
843 | return ret; |
844 | } | |
845 | ||
846 | /* | |
847 | * provide compatibility with generic tun/tap interface | |
848 | */ | |
849 | static long macvtap_ioctl(struct file *file, unsigned int cmd, | |
850 | unsigned long arg) | |
851 | { | |
02df55d2 AB |
852 | struct macvtap_queue *q = file->private_data; |
853 | struct macvlan_dev *vlan; | |
20d29d7a AB |
854 | void __user *argp = (void __user *)arg; |
855 | struct ifreq __user *ifr = argp; | |
856 | unsigned int __user *up = argp; | |
857 | unsigned int u; | |
55afbd08 MT |
858 | int __user *sp = argp; |
859 | int s; | |
02df55d2 | 860 | int ret; |
20d29d7a AB |
861 | |
862 | switch (cmd) { | |
863 | case TUNSETIFF: | |
864 | /* ignore the name, just look at flags */ | |
865 | if (get_user(u, &ifr->ifr_flags)) | |
866 | return -EFAULT; | |
b9fb9ee0 AB |
867 | |
868 | ret = 0; | |
869 | if ((u & ~IFF_VNET_HDR) != (IFF_NO_PI | IFF_TAP)) | |
870 | ret = -EINVAL; | |
871 | else | |
872 | q->flags = u; | |
873 | ||
874 | return ret; | |
20d29d7a AB |
875 | |
876 | case TUNGETIFF: | |
02df55d2 | 877 | rcu_read_lock_bh(); |
13707f9e | 878 | vlan = rcu_dereference_bh(q->vlan); |
02df55d2 AB |
879 | if (vlan) |
880 | dev_hold(vlan->dev); | |
881 | rcu_read_unlock_bh(); | |
882 | ||
883 | if (!vlan) | |
20d29d7a | 884 | return -ENOLINK; |
20d29d7a | 885 | |
02df55d2 | 886 | ret = 0; |
13707f9e | 887 | if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) || |
b9fb9ee0 | 888 | put_user(q->flags, &ifr->ifr_flags)) |
02df55d2 AB |
889 | ret = -EFAULT; |
890 | dev_put(vlan->dev); | |
891 | return ret; | |
20d29d7a AB |
892 | |
893 | case TUNGETFEATURES: | |
b9fb9ee0 | 894 | if (put_user(IFF_TAP | IFF_NO_PI | IFF_VNET_HDR, up)) |
20d29d7a AB |
895 | return -EFAULT; |
896 | return 0; | |
897 | ||
898 | case TUNSETSNDBUF: | |
899 | if (get_user(u, up)) | |
900 | return -EFAULT; | |
901 | ||
20d29d7a | 902 | q->sk.sk_sndbuf = u; |
20d29d7a AB |
903 | return 0; |
904 | ||
55afbd08 MT |
905 | case TUNGETVNETHDRSZ: |
906 | s = q->vnet_hdr_sz; | |
907 | if (put_user(s, sp)) | |
908 | return -EFAULT; | |
909 | return 0; | |
910 | ||
911 | case TUNSETVNETHDRSZ: | |
912 | if (get_user(s, sp)) | |
913 | return -EFAULT; | |
914 | if (s < (int)sizeof(struct virtio_net_hdr)) | |
915 | return -EINVAL; | |
916 | ||
917 | q->vnet_hdr_sz = s; | |
918 | return 0; | |
919 | ||
20d29d7a AB |
920 | case TUNSETOFFLOAD: |
921 | /* let the user check for future flags */ | |
922 | if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | | |
b9fb9ee0 | 923 | TUN_F_TSO_ECN | TUN_F_UFO)) |
20d29d7a AB |
924 | return -EINVAL; |
925 | ||
b9fb9ee0 AB |
926 | /* TODO: only accept frames with the features that |
927 | got enabled for forwarded frames */ | |
928 | if (!(q->flags & IFF_VNET_HDR)) | |
929 | return -EINVAL; | |
20d29d7a AB |
930 | return 0; |
931 | ||
932 | default: | |
933 | return -EINVAL; | |
934 | } | |
935 | } | |
936 | ||
937 | #ifdef CONFIG_COMPAT | |
938 | static long macvtap_compat_ioctl(struct file *file, unsigned int cmd, | |
939 | unsigned long arg) | |
940 | { | |
941 | return macvtap_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
942 | } | |
943 | #endif | |
944 | ||
945 | static const struct file_operations macvtap_fops = { | |
946 | .owner = THIS_MODULE, | |
947 | .open = macvtap_open, | |
948 | .release = macvtap_release, | |
949 | .aio_read = macvtap_aio_read, | |
950 | .aio_write = macvtap_aio_write, | |
951 | .poll = macvtap_poll, | |
952 | .llseek = no_llseek, | |
953 | .unlocked_ioctl = macvtap_ioctl, | |
954 | #ifdef CONFIG_COMPAT | |
955 | .compat_ioctl = macvtap_compat_ioctl, | |
956 | #endif | |
957 | }; | |
958 | ||
501c774c AB |
959 | static int macvtap_sendmsg(struct kiocb *iocb, struct socket *sock, |
960 | struct msghdr *m, size_t total_len) | |
961 | { | |
962 | struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock); | |
97bc3633 | 963 | return macvtap_get_user(q, m, m->msg_iov, total_len, m->msg_iovlen, |
501c774c AB |
964 | m->msg_flags & MSG_DONTWAIT); |
965 | } | |
966 | ||
967 | static int macvtap_recvmsg(struct kiocb *iocb, struct socket *sock, | |
968 | struct msghdr *m, size_t total_len, | |
969 | int flags) | |
970 | { | |
971 | struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock); | |
972 | int ret; | |
973 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) | |
974 | return -EINVAL; | |
975 | ret = macvtap_do_read(q, iocb, m->msg_iov, total_len, | |
976 | flags & MSG_DONTWAIT); | |
977 | if (ret > total_len) { | |
978 | m->msg_flags |= MSG_TRUNC; | |
979 | ret = flags & MSG_TRUNC ? ret : total_len; | |
980 | } | |
981 | return ret; | |
982 | } | |
983 | ||
984 | /* Ops structure to mimic raw sockets with tun */ | |
985 | static const struct proto_ops macvtap_socket_ops = { | |
986 | .sendmsg = macvtap_sendmsg, | |
987 | .recvmsg = macvtap_recvmsg, | |
988 | }; | |
989 | ||
990 | /* Get an underlying socket object from tun file. Returns error unless file is | |
991 | * attached to a device. The returned object works like a packet socket, it | |
992 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
993 | * holding a reference to the file for as long as the socket is in use. */ | |
994 | struct socket *macvtap_get_socket(struct file *file) | |
995 | { | |
996 | struct macvtap_queue *q; | |
997 | if (file->f_op != &macvtap_fops) | |
998 | return ERR_PTR(-EINVAL); | |
999 | q = file->private_data; | |
1000 | if (!q) | |
1001 | return ERR_PTR(-EBADFD); | |
1002 | return &q->sock; | |
1003 | } | |
1004 | EXPORT_SYMBOL_GPL(macvtap_get_socket); | |
1005 | ||
9bf1907f EB |
1006 | static int macvtap_device_event(struct notifier_block *unused, |
1007 | unsigned long event, void *ptr) | |
1008 | { | |
1009 | struct net_device *dev = ptr; | |
e09eff7f | 1010 | struct macvlan_dev *vlan; |
9bf1907f EB |
1011 | struct device *classdev; |
1012 | dev_t devt; | |
e09eff7f | 1013 | int err; |
9bf1907f EB |
1014 | |
1015 | if (dev->rtnl_link_ops != &macvtap_link_ops) | |
1016 | return NOTIFY_DONE; | |
1017 | ||
e09eff7f | 1018 | vlan = netdev_priv(dev); |
9bf1907f EB |
1019 | |
1020 | switch (event) { | |
1021 | case NETDEV_REGISTER: | |
1022 | /* Create the device node here after the network device has | |
1023 | * been registered but before register_netdevice has | |
1024 | * finished running. | |
1025 | */ | |
e09eff7f EB |
1026 | err = macvtap_get_minor(vlan); |
1027 | if (err) | |
1028 | return notifier_from_errno(err); | |
1029 | ||
1030 | devt = MKDEV(MAJOR(macvtap_major), vlan->minor); | |
9bf1907f EB |
1031 | classdev = device_create(macvtap_class, &dev->dev, devt, |
1032 | dev, "tap%d", dev->ifindex); | |
e09eff7f EB |
1033 | if (IS_ERR(classdev)) { |
1034 | macvtap_free_minor(vlan); | |
9bf1907f | 1035 | return notifier_from_errno(PTR_ERR(classdev)); |
e09eff7f | 1036 | } |
9bf1907f EB |
1037 | break; |
1038 | case NETDEV_UNREGISTER: | |
e09eff7f | 1039 | devt = MKDEV(MAJOR(macvtap_major), vlan->minor); |
9bf1907f | 1040 | device_destroy(macvtap_class, devt); |
e09eff7f | 1041 | macvtap_free_minor(vlan); |
9bf1907f EB |
1042 | break; |
1043 | } | |
1044 | ||
1045 | return NOTIFY_DONE; | |
1046 | } | |
1047 | ||
1048 | static struct notifier_block macvtap_notifier_block __read_mostly = { | |
1049 | .notifier_call = macvtap_device_event, | |
1050 | }; | |
1051 | ||
20d29d7a AB |
1052 | static int macvtap_init(void) |
1053 | { | |
1054 | int err; | |
1055 | ||
1056 | err = alloc_chrdev_region(&macvtap_major, 0, | |
1057 | MACVTAP_NUM_DEVS, "macvtap"); | |
1058 | if (err) | |
1059 | goto out1; | |
1060 | ||
1061 | cdev_init(&macvtap_cdev, &macvtap_fops); | |
1062 | err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS); | |
1063 | if (err) | |
1064 | goto out2; | |
1065 | ||
1066 | macvtap_class = class_create(THIS_MODULE, "macvtap"); | |
1067 | if (IS_ERR(macvtap_class)) { | |
1068 | err = PTR_ERR(macvtap_class); | |
1069 | goto out3; | |
1070 | } | |
1071 | ||
9bf1907f | 1072 | err = register_netdevice_notifier(&macvtap_notifier_block); |
20d29d7a AB |
1073 | if (err) |
1074 | goto out4; | |
1075 | ||
9bf1907f EB |
1076 | err = macvlan_link_register(&macvtap_link_ops); |
1077 | if (err) | |
1078 | goto out5; | |
1079 | ||
20d29d7a AB |
1080 | return 0; |
1081 | ||
9bf1907f EB |
1082 | out5: |
1083 | unregister_netdevice_notifier(&macvtap_notifier_block); | |
20d29d7a AB |
1084 | out4: |
1085 | class_unregister(macvtap_class); | |
1086 | out3: | |
1087 | cdev_del(&macvtap_cdev); | |
1088 | out2: | |
1089 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); | |
1090 | out1: | |
1091 | return err; | |
1092 | } | |
1093 | module_init(macvtap_init); | |
1094 | ||
1095 | static void macvtap_exit(void) | |
1096 | { | |
1097 | rtnl_link_unregister(&macvtap_link_ops); | |
9bf1907f | 1098 | unregister_netdevice_notifier(&macvtap_notifier_block); |
20d29d7a AB |
1099 | class_unregister(macvtap_class); |
1100 | cdev_del(&macvtap_cdev); | |
1101 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); | |
1102 | } | |
1103 | module_exit(macvtap_exit); | |
1104 | ||
1105 | MODULE_ALIAS_RTNL_LINK("macvtap"); | |
1106 | MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); | |
1107 | MODULE_LICENSE("GPL"); |