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> | |
12 | #include <linux/init.h> | |
13 | #include <linux/wait.h> | |
14 | #include <linux/cdev.h> | |
15 | #include <linux/fs.h> | |
16 | ||
17 | #include <net/net_namespace.h> | |
18 | #include <net/rtnetlink.h> | |
19 | #include <net/sock.h> | |
20 | ||
21 | /* | |
22 | * A macvtap queue is the central object of this driver, it connects | |
23 | * an open character device to a macvlan interface. There can be | |
24 | * multiple queues on one interface, which map back to queues | |
25 | * implemented in hardware on the underlying device. | |
26 | * | |
27 | * macvtap_proto is used to allocate queues through the sock allocation | |
28 | * mechanism. | |
29 | * | |
30 | * TODO: multiqueue support is currently not implemented, even though | |
31 | * macvtap is basically prepared for that. We will need to add this | |
32 | * here as well as in virtio-net and qemu to get line rate on 10gbit | |
33 | * adapters from a guest. | |
34 | */ | |
35 | struct macvtap_queue { | |
36 | struct sock sk; | |
37 | struct socket sock; | |
38 | struct macvlan_dev *vlan; | |
39 | struct file *file; | |
40 | }; | |
41 | ||
42 | static struct proto macvtap_proto = { | |
43 | .name = "macvtap", | |
44 | .owner = THIS_MODULE, | |
45 | .obj_size = sizeof (struct macvtap_queue), | |
46 | }; | |
47 | ||
48 | /* | |
49 | * Minor number matches netdev->ifindex, so need a potentially | |
50 | * large value. This also makes it possible to split the | |
51 | * tap functionality out again in the future by offering it | |
52 | * from other drivers besides macvtap. As long as every device | |
53 | * only has one tap, the interface numbers assure that the | |
54 | * device nodes are unique. | |
55 | */ | |
56 | static unsigned int macvtap_major; | |
57 | #define MACVTAP_NUM_DEVS 65536 | |
58 | static struct class *macvtap_class; | |
59 | static struct cdev macvtap_cdev; | |
60 | ||
61 | /* | |
62 | * RCU usage: | |
02df55d2 AB |
63 | * The macvtap_queue and the macvlan_dev are loosely coupled, the |
64 | * pointers from one to the other can only be read while rcu_read_lock | |
65 | * or macvtap_lock is held. | |
20d29d7a | 66 | * |
02df55d2 AB |
67 | * Both the file and the macvlan_dev hold a reference on the macvtap_queue |
68 | * through sock_hold(&q->sk). When the macvlan_dev goes away first, | |
69 | * q->vlan becomes inaccessible. When the files gets closed, | |
70 | * macvtap_get_queue() fails. | |
20d29d7a | 71 | * |
02df55d2 AB |
72 | * There may still be references to the struct sock inside of the |
73 | * queue from outbound SKBs, but these never reference back to the | |
74 | * file or the dev. The data structure is freed through __sk_free | |
75 | * when both our references and any pending SKBs are gone. | |
20d29d7a AB |
76 | */ |
77 | static DEFINE_SPINLOCK(macvtap_lock); | |
78 | ||
79 | /* | |
80 | * Choose the next free queue, for now there is only one | |
81 | */ | |
82 | static int macvtap_set_queue(struct net_device *dev, struct file *file, | |
83 | struct macvtap_queue *q) | |
84 | { | |
85 | struct macvlan_dev *vlan = netdev_priv(dev); | |
86 | int err = -EBUSY; | |
87 | ||
88 | spin_lock(&macvtap_lock); | |
89 | if (rcu_dereference(vlan->tap)) | |
90 | goto out; | |
91 | ||
92 | err = 0; | |
02df55d2 | 93 | rcu_assign_pointer(q->vlan, vlan); |
20d29d7a | 94 | rcu_assign_pointer(vlan->tap, q); |
02df55d2 | 95 | sock_hold(&q->sk); |
20d29d7a AB |
96 | |
97 | q->file = file; | |
02df55d2 | 98 | file->private_data = q; |
20d29d7a AB |
99 | |
100 | out: | |
101 | spin_unlock(&macvtap_lock); | |
102 | return err; | |
103 | } | |
104 | ||
105 | /* | |
02df55d2 AB |
106 | * The file owning the queue got closed, give up both |
107 | * the reference that the files holds as well as the | |
108 | * one from the macvlan_dev if that still exists. | |
20d29d7a AB |
109 | * |
110 | * Using the spinlock makes sure that we don't get | |
111 | * to the queue again after destroying it. | |
20d29d7a | 112 | */ |
02df55d2 | 113 | static void macvtap_put_queue(struct macvtap_queue *q) |
20d29d7a | 114 | { |
02df55d2 | 115 | struct macvlan_dev *vlan; |
20d29d7a AB |
116 | |
117 | spin_lock(&macvtap_lock); | |
02df55d2 AB |
118 | vlan = rcu_dereference(q->vlan); |
119 | if (vlan) { | |
120 | rcu_assign_pointer(vlan->tap, NULL); | |
121 | rcu_assign_pointer(q->vlan, NULL); | |
122 | sock_put(&q->sk); | |
20d29d7a AB |
123 | } |
124 | ||
20d29d7a AB |
125 | spin_unlock(&macvtap_lock); |
126 | ||
127 | synchronize_rcu(); | |
128 | sock_put(&q->sk); | |
129 | } | |
130 | ||
131 | /* | |
132 | * Since we only support one queue, just dereference the pointer. | |
133 | */ | |
134 | static struct macvtap_queue *macvtap_get_queue(struct net_device *dev, | |
135 | struct sk_buff *skb) | |
136 | { | |
137 | struct macvlan_dev *vlan = netdev_priv(dev); | |
138 | ||
139 | return rcu_dereference(vlan->tap); | |
140 | } | |
141 | ||
02df55d2 AB |
142 | /* |
143 | * The net_device is going away, give up the reference | |
144 | * that it holds on the queue (all the queues one day) | |
145 | * and safely set the pointer from the queues to NULL. | |
146 | */ | |
20d29d7a AB |
147 | static void macvtap_del_queues(struct net_device *dev) |
148 | { | |
149 | struct macvlan_dev *vlan = netdev_priv(dev); | |
564517e8 | 150 | struct macvtap_queue *q; |
02df55d2 AB |
151 | |
152 | spin_lock(&macvtap_lock); | |
153 | q = rcu_dereference(vlan->tap); | |
154 | if (!q) { | |
155 | spin_unlock(&macvtap_lock); | |
156 | return; | |
564517e8 | 157 | } |
20d29d7a | 158 | |
02df55d2 AB |
159 | rcu_assign_pointer(vlan->tap, NULL); |
160 | rcu_assign_pointer(q->vlan, NULL); | |
161 | spin_unlock(&macvtap_lock); | |
162 | ||
163 | synchronize_rcu(); | |
564517e8 | 164 | sock_put(&q->sk); |
20d29d7a AB |
165 | } |
166 | ||
167 | /* | |
168 | * Forward happens for data that gets sent from one macvlan | |
169 | * endpoint to another one in bridge mode. We just take | |
170 | * the skb and put it into the receive queue. | |
171 | */ | |
172 | static int macvtap_forward(struct net_device *dev, struct sk_buff *skb) | |
173 | { | |
174 | struct macvtap_queue *q = macvtap_get_queue(dev, skb); | |
175 | if (!q) | |
176 | return -ENOLINK; | |
177 | ||
178 | skb_queue_tail(&q->sk.sk_receive_queue, skb); | |
179 | wake_up(q->sk.sk_sleep); | |
180 | return 0; | |
181 | } | |
182 | ||
183 | /* | |
184 | * Receive is for data from the external interface (lowerdev), | |
185 | * in case of macvtap, we can treat that the same way as | |
186 | * forward, which macvlan cannot. | |
187 | */ | |
188 | static int macvtap_receive(struct sk_buff *skb) | |
189 | { | |
190 | skb_push(skb, ETH_HLEN); | |
191 | return macvtap_forward(skb->dev, skb); | |
192 | } | |
193 | ||
194 | static int macvtap_newlink(struct net *src_net, | |
195 | struct net_device *dev, | |
196 | struct nlattr *tb[], | |
197 | struct nlattr *data[]) | |
198 | { | |
199 | struct device *classdev; | |
200 | dev_t devt; | |
201 | int err; | |
202 | ||
203 | err = macvlan_common_newlink(src_net, dev, tb, data, | |
204 | macvtap_receive, macvtap_forward); | |
205 | if (err) | |
206 | goto out; | |
207 | ||
208 | devt = MKDEV(MAJOR(macvtap_major), dev->ifindex); | |
209 | ||
210 | classdev = device_create(macvtap_class, &dev->dev, devt, | |
211 | dev, "tap%d", dev->ifindex); | |
212 | if (IS_ERR(classdev)) { | |
213 | err = PTR_ERR(classdev); | |
214 | macvtap_del_queues(dev); | |
215 | } | |
216 | ||
217 | out: | |
218 | return err; | |
219 | } | |
220 | ||
221 | static void macvtap_dellink(struct net_device *dev, | |
222 | struct list_head *head) | |
223 | { | |
224 | device_destroy(macvtap_class, | |
225 | MKDEV(MAJOR(macvtap_major), dev->ifindex)); | |
226 | ||
227 | macvtap_del_queues(dev); | |
228 | macvlan_dellink(dev, head); | |
229 | } | |
230 | ||
231 | static struct rtnl_link_ops macvtap_link_ops __read_mostly = { | |
232 | .kind = "macvtap", | |
233 | .newlink = macvtap_newlink, | |
234 | .dellink = macvtap_dellink, | |
235 | }; | |
236 | ||
237 | ||
238 | static void macvtap_sock_write_space(struct sock *sk) | |
239 | { | |
240 | if (!sock_writeable(sk) || | |
241 | !test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) | |
242 | return; | |
243 | ||
244 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
245 | wake_up_interruptible_sync(sk->sk_sleep); | |
246 | } | |
247 | ||
248 | static int macvtap_open(struct inode *inode, struct file *file) | |
249 | { | |
250 | struct net *net = current->nsproxy->net_ns; | |
251 | struct net_device *dev = dev_get_by_index(net, iminor(inode)); | |
252 | struct macvtap_queue *q; | |
253 | int err; | |
254 | ||
255 | err = -ENODEV; | |
256 | if (!dev) | |
257 | goto out; | |
258 | ||
259 | /* check if this is a macvtap device */ | |
260 | err = -EINVAL; | |
261 | if (dev->rtnl_link_ops != &macvtap_link_ops) | |
262 | goto out; | |
263 | ||
264 | err = -ENOMEM; | |
265 | q = (struct macvtap_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, | |
266 | &macvtap_proto); | |
267 | if (!q) | |
268 | goto out; | |
269 | ||
270 | init_waitqueue_head(&q->sock.wait); | |
271 | q->sock.type = SOCK_RAW; | |
272 | q->sock.state = SS_CONNECTED; | |
273 | sock_init_data(&q->sock, &q->sk); | |
20d29d7a AB |
274 | q->sk.sk_write_space = macvtap_sock_write_space; |
275 | ||
276 | err = macvtap_set_queue(dev, file, q); | |
277 | if (err) | |
278 | sock_put(&q->sk); | |
279 | ||
280 | out: | |
281 | if (dev) | |
282 | dev_put(dev); | |
283 | ||
284 | return err; | |
285 | } | |
286 | ||
287 | static int macvtap_release(struct inode *inode, struct file *file) | |
288 | { | |
02df55d2 AB |
289 | struct macvtap_queue *q = file->private_data; |
290 | macvtap_put_queue(q); | |
20d29d7a AB |
291 | return 0; |
292 | } | |
293 | ||
294 | static unsigned int macvtap_poll(struct file *file, poll_table * wait) | |
295 | { | |
02df55d2 | 296 | struct macvtap_queue *q = file->private_data; |
20d29d7a AB |
297 | unsigned int mask = POLLERR; |
298 | ||
299 | if (!q) | |
300 | goto out; | |
301 | ||
302 | mask = 0; | |
303 | poll_wait(file, &q->sock.wait, wait); | |
304 | ||
305 | if (!skb_queue_empty(&q->sk.sk_receive_queue)) | |
306 | mask |= POLLIN | POLLRDNORM; | |
307 | ||
308 | if (sock_writeable(&q->sk) || | |
309 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &q->sock.flags) && | |
310 | sock_writeable(&q->sk))) | |
311 | mask |= POLLOUT | POLLWRNORM; | |
312 | ||
313 | out: | |
20d29d7a AB |
314 | return mask; |
315 | } | |
316 | ||
317 | /* Get packet from user space buffer */ | |
318 | static ssize_t macvtap_get_user(struct macvtap_queue *q, | |
319 | const struct iovec *iv, size_t count, | |
320 | int noblock) | |
321 | { | |
322 | struct sk_buff *skb; | |
02df55d2 | 323 | struct macvlan_dev *vlan; |
20d29d7a AB |
324 | size_t len = count; |
325 | int err; | |
326 | ||
327 | if (unlikely(len < ETH_HLEN)) | |
328 | return -EINVAL; | |
329 | ||
330 | skb = sock_alloc_send_skb(&q->sk, NET_IP_ALIGN + len, noblock, &err); | |
02df55d2 AB |
331 | if (!skb) |
332 | goto err; | |
20d29d7a AB |
333 | |
334 | skb_reserve(skb, NET_IP_ALIGN); | |
335 | skb_put(skb, count); | |
336 | ||
02df55d2 AB |
337 | err = skb_copy_datagram_from_iovec(skb, 0, iv, 0, len); |
338 | if (err) | |
339 | goto err; | |
20d29d7a AB |
340 | |
341 | skb_set_network_header(skb, ETH_HLEN); | |
02df55d2 AB |
342 | rcu_read_lock_bh(); |
343 | vlan = rcu_dereference(q->vlan); | |
344 | if (vlan) | |
345 | macvlan_start_xmit(skb, vlan->dev); | |
346 | else | |
347 | kfree_skb(skb); | |
348 | rcu_read_unlock_bh(); | |
20d29d7a AB |
349 | |
350 | return count; | |
02df55d2 AB |
351 | |
352 | err: | |
353 | rcu_read_lock_bh(); | |
354 | vlan = rcu_dereference(q->vlan); | |
355 | if (vlan) | |
356 | macvlan_count_rx(q->vlan, 0, false, false); | |
357 | rcu_read_unlock_bh(); | |
358 | ||
359 | kfree_skb(skb); | |
360 | ||
361 | return err; | |
20d29d7a AB |
362 | } |
363 | ||
364 | static ssize_t macvtap_aio_write(struct kiocb *iocb, const struct iovec *iv, | |
365 | unsigned long count, loff_t pos) | |
366 | { | |
367 | struct file *file = iocb->ki_filp; | |
368 | ssize_t result = -ENOLINK; | |
02df55d2 | 369 | struct macvtap_queue *q = file->private_data; |
20d29d7a AB |
370 | |
371 | result = macvtap_get_user(q, iv, iov_length(iv, count), | |
372 | file->f_flags & O_NONBLOCK); | |
20d29d7a AB |
373 | return result; |
374 | } | |
375 | ||
376 | /* Put packet to the user space buffer */ | |
377 | static ssize_t macvtap_put_user(struct macvtap_queue *q, | |
378 | const struct sk_buff *skb, | |
379 | const struct iovec *iv, int len) | |
380 | { | |
02df55d2 | 381 | struct macvlan_dev *vlan; |
20d29d7a AB |
382 | int ret; |
383 | ||
384 | len = min_t(int, skb->len, len); | |
385 | ||
386 | ret = skb_copy_datagram_const_iovec(skb, 0, iv, 0, len); | |
387 | ||
02df55d2 AB |
388 | rcu_read_lock_bh(); |
389 | vlan = rcu_dereference(q->vlan); | |
20d29d7a | 390 | macvlan_count_rx(vlan, len, ret == 0, 0); |
02df55d2 | 391 | rcu_read_unlock_bh(); |
20d29d7a AB |
392 | |
393 | return ret ? ret : len; | |
394 | } | |
395 | ||
396 | static ssize_t macvtap_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
397 | unsigned long count, loff_t pos) | |
398 | { | |
399 | struct file *file = iocb->ki_filp; | |
02df55d2 | 400 | struct macvtap_queue *q = file->private_data; |
20d29d7a AB |
401 | |
402 | DECLARE_WAITQUEUE(wait, current); | |
403 | struct sk_buff *skb; | |
404 | ssize_t len, ret = 0; | |
405 | ||
02df55d2 AB |
406 | if (!q) { |
407 | ret = -ENOLINK; | |
408 | goto out; | |
409 | } | |
20d29d7a AB |
410 | |
411 | len = iov_length(iv, count); | |
412 | if (len < 0) { | |
413 | ret = -EINVAL; | |
414 | goto out; | |
415 | } | |
416 | ||
417 | add_wait_queue(q->sk.sk_sleep, &wait); | |
418 | while (len) { | |
419 | current->state = TASK_INTERRUPTIBLE; | |
420 | ||
421 | /* Read frames from the queue */ | |
422 | skb = skb_dequeue(&q->sk.sk_receive_queue); | |
423 | if (!skb) { | |
424 | if (file->f_flags & O_NONBLOCK) { | |
425 | ret = -EAGAIN; | |
426 | break; | |
427 | } | |
428 | if (signal_pending(current)) { | |
429 | ret = -ERESTARTSYS; | |
430 | break; | |
431 | } | |
432 | /* Nothing to read, let's sleep */ | |
433 | schedule(); | |
434 | continue; | |
435 | } | |
436 | ret = macvtap_put_user(q, skb, iv, len); | |
437 | kfree_skb(skb); | |
438 | break; | |
439 | } | |
440 | ||
441 | current->state = TASK_RUNNING; | |
442 | remove_wait_queue(q->sk.sk_sleep, &wait); | |
443 | ||
444 | out: | |
20d29d7a AB |
445 | return ret; |
446 | } | |
447 | ||
448 | /* | |
449 | * provide compatibility with generic tun/tap interface | |
450 | */ | |
451 | static long macvtap_ioctl(struct file *file, unsigned int cmd, | |
452 | unsigned long arg) | |
453 | { | |
02df55d2 AB |
454 | struct macvtap_queue *q = file->private_data; |
455 | struct macvlan_dev *vlan; | |
20d29d7a AB |
456 | void __user *argp = (void __user *)arg; |
457 | struct ifreq __user *ifr = argp; | |
458 | unsigned int __user *up = argp; | |
459 | unsigned int u; | |
02df55d2 | 460 | int ret; |
20d29d7a AB |
461 | |
462 | switch (cmd) { | |
463 | case TUNSETIFF: | |
464 | /* ignore the name, just look at flags */ | |
465 | if (get_user(u, &ifr->ifr_flags)) | |
466 | return -EFAULT; | |
467 | if (u != (IFF_TAP | IFF_NO_PI)) | |
468 | return -EINVAL; | |
469 | return 0; | |
470 | ||
471 | case TUNGETIFF: | |
02df55d2 AB |
472 | rcu_read_lock_bh(); |
473 | vlan = rcu_dereference(q->vlan); | |
474 | if (vlan) | |
475 | dev_hold(vlan->dev); | |
476 | rcu_read_unlock_bh(); | |
477 | ||
478 | if (!vlan) | |
20d29d7a | 479 | return -ENOLINK; |
20d29d7a | 480 | |
02df55d2 | 481 | ret = 0; |
20d29d7a AB |
482 | if (copy_to_user(&ifr->ifr_name, q->vlan->dev->name, IFNAMSIZ) || |
483 | put_user((TUN_TAP_DEV | TUN_NO_PI), &ifr->ifr_flags)) | |
02df55d2 AB |
484 | ret = -EFAULT; |
485 | dev_put(vlan->dev); | |
486 | return ret; | |
20d29d7a AB |
487 | |
488 | case TUNGETFEATURES: | |
489 | if (put_user((IFF_TAP | IFF_NO_PI), up)) | |
490 | return -EFAULT; | |
491 | return 0; | |
492 | ||
493 | case TUNSETSNDBUF: | |
494 | if (get_user(u, up)) | |
495 | return -EFAULT; | |
496 | ||
20d29d7a | 497 | q->sk.sk_sndbuf = u; |
20d29d7a AB |
498 | return 0; |
499 | ||
500 | case TUNSETOFFLOAD: | |
501 | /* let the user check for future flags */ | |
502 | if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | | |
503 | TUN_F_TSO_ECN | TUN_F_UFO)) | |
504 | return -EINVAL; | |
505 | ||
506 | /* TODO: add support for these, so far we don't | |
507 | support any offload */ | |
508 | if (arg & (TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 | | |
509 | TUN_F_TSO_ECN | TUN_F_UFO)) | |
510 | return -EINVAL; | |
511 | ||
512 | return 0; | |
513 | ||
514 | default: | |
515 | return -EINVAL; | |
516 | } | |
517 | } | |
518 | ||
519 | #ifdef CONFIG_COMPAT | |
520 | static long macvtap_compat_ioctl(struct file *file, unsigned int cmd, | |
521 | unsigned long arg) | |
522 | { | |
523 | return macvtap_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); | |
524 | } | |
525 | #endif | |
526 | ||
527 | static const struct file_operations macvtap_fops = { | |
528 | .owner = THIS_MODULE, | |
529 | .open = macvtap_open, | |
530 | .release = macvtap_release, | |
531 | .aio_read = macvtap_aio_read, | |
532 | .aio_write = macvtap_aio_write, | |
533 | .poll = macvtap_poll, | |
534 | .llseek = no_llseek, | |
535 | .unlocked_ioctl = macvtap_ioctl, | |
536 | #ifdef CONFIG_COMPAT | |
537 | .compat_ioctl = macvtap_compat_ioctl, | |
538 | #endif | |
539 | }; | |
540 | ||
541 | static int macvtap_init(void) | |
542 | { | |
543 | int err; | |
544 | ||
545 | err = alloc_chrdev_region(&macvtap_major, 0, | |
546 | MACVTAP_NUM_DEVS, "macvtap"); | |
547 | if (err) | |
548 | goto out1; | |
549 | ||
550 | cdev_init(&macvtap_cdev, &macvtap_fops); | |
551 | err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS); | |
552 | if (err) | |
553 | goto out2; | |
554 | ||
555 | macvtap_class = class_create(THIS_MODULE, "macvtap"); | |
556 | if (IS_ERR(macvtap_class)) { | |
557 | err = PTR_ERR(macvtap_class); | |
558 | goto out3; | |
559 | } | |
560 | ||
561 | err = macvlan_link_register(&macvtap_link_ops); | |
562 | if (err) | |
563 | goto out4; | |
564 | ||
565 | return 0; | |
566 | ||
567 | out4: | |
568 | class_unregister(macvtap_class); | |
569 | out3: | |
570 | cdev_del(&macvtap_cdev); | |
571 | out2: | |
572 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); | |
573 | out1: | |
574 | return err; | |
575 | } | |
576 | module_init(macvtap_init); | |
577 | ||
578 | static void macvtap_exit(void) | |
579 | { | |
580 | rtnl_link_unregister(&macvtap_link_ops); | |
581 | class_unregister(macvtap_class); | |
582 | cdev_del(&macvtap_cdev); | |
583 | unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS); | |
584 | } | |
585 | module_exit(macvtap_exit); | |
586 | ||
587 | MODULE_ALIAS_RTNL_LINK("macvtap"); | |
588 | MODULE_AUTHOR("Arnd Bergmann <arnd@arndb.de>"); | |
589 | MODULE_LICENSE("GPL"); |