Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * TUN - Universal TUN/TAP device driver. | |
3 | * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Changes: | |
20 | * | |
ff4cc3ac MK |
21 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
22 | * Add TUNSETLINK ioctl to set the link encapsulation | |
23 | * | |
1da177e4 | 24 | * Mark Smith <markzzzsmith@yahoo.com.au> |
f271b2cc | 25 | * Use random_ether_addr() for tap MAC address. |
1da177e4 LT |
26 | * |
27 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 | |
28 | * Fixes in packet dropping, queue length setting and queue wakeup. | |
29 | * Increased default tx queue length. | |
30 | * Added ethtool API. | |
31 | * Minor cleanups | |
32 | * | |
33 | * Daniel Podlejski <underley@underley.eu.org> | |
34 | * Modifications for 2.3.99-pre5 kernel. | |
35 | */ | |
36 | ||
37 | #define DRV_NAME "tun" | |
38 | #define DRV_VERSION "1.6" | |
39 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
40 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
41 | ||
1da177e4 LT |
42 | #include <linux/module.h> |
43 | #include <linux/errno.h> | |
44 | #include <linux/kernel.h> | |
45 | #include <linux/major.h> | |
46 | #include <linux/slab.h> | |
47 | #include <linux/poll.h> | |
48 | #include <linux/fcntl.h> | |
49 | #include <linux/init.h> | |
50 | #include <linux/skbuff.h> | |
51 | #include <linux/netdevice.h> | |
52 | #include <linux/etherdevice.h> | |
53 | #include <linux/miscdevice.h> | |
54 | #include <linux/ethtool.h> | |
55 | #include <linux/rtnetlink.h> | |
50857e2a | 56 | #include <linux/compat.h> |
1da177e4 LT |
57 | #include <linux/if.h> |
58 | #include <linux/if_arp.h> | |
59 | #include <linux/if_ether.h> | |
60 | #include <linux/if_tun.h> | |
61 | #include <linux/crc32.h> | |
d647a591 | 62 | #include <linux/nsproxy.h> |
f43798c2 | 63 | #include <linux/virtio_net.h> |
99405162 | 64 | #include <linux/rcupdate.h> |
881d966b | 65 | #include <net/net_namespace.h> |
79d17604 | 66 | #include <net/netns/generic.h> |
f019a7a5 | 67 | #include <net/rtnetlink.h> |
33dccbb0 | 68 | #include <net/sock.h> |
1da177e4 LT |
69 | |
70 | #include <asm/system.h> | |
71 | #include <asm/uaccess.h> | |
72 | ||
14daa021 RR |
73 | /* Uncomment to enable debugging */ |
74 | /* #define TUN_DEBUG 1 */ | |
75 | ||
1da177e4 LT |
76 | #ifdef TUN_DEBUG |
77 | static int debug; | |
14daa021 RR |
78 | |
79 | #define DBG if(tun->debug)printk | |
80 | #define DBG1 if(debug==2)printk | |
81 | #else | |
82 | #define DBG( a... ) | |
83 | #define DBG1( a... ) | |
84 | #endif | |
85 | ||
f271b2cc MK |
86 | #define FLT_EXACT_COUNT 8 |
87 | struct tap_filter { | |
88 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
89 | u32 mask[2]; /* Mask of the hashed addrs */ | |
90 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
91 | }; | |
92 | ||
631ab46b | 93 | struct tun_file { |
c70f1829 | 94 | atomic_t count; |
631ab46b | 95 | struct tun_struct *tun; |
36b50bab | 96 | struct net *net; |
631ab46b EB |
97 | }; |
98 | ||
33dccbb0 HX |
99 | struct tun_sock; |
100 | ||
14daa021 | 101 | struct tun_struct { |
631ab46b | 102 | struct tun_file *tfile; |
f271b2cc | 103 | unsigned int flags; |
14daa021 RR |
104 | uid_t owner; |
105 | gid_t group; | |
106 | ||
14daa021 | 107 | struct net_device *dev; |
f271b2cc | 108 | struct fasync_struct *fasync; |
14daa021 | 109 | |
f271b2cc | 110 | struct tap_filter txflt; |
33dccbb0 | 111 | struct socket socket; |
43815482 | 112 | struct socket_wq wq; |
14daa021 RR |
113 | #ifdef TUN_DEBUG |
114 | int debug; | |
1da177e4 | 115 | #endif |
14daa021 | 116 | }; |
1da177e4 | 117 | |
33dccbb0 HX |
118 | struct tun_sock { |
119 | struct sock sk; | |
120 | struct tun_struct *tun; | |
121 | }; | |
122 | ||
123 | static inline struct tun_sock *tun_sk(struct sock *sk) | |
124 | { | |
125 | return container_of(sk, struct tun_sock, sk); | |
126 | } | |
127 | ||
a7385ba2 EB |
128 | static int tun_attach(struct tun_struct *tun, struct file *file) |
129 | { | |
631ab46b | 130 | struct tun_file *tfile = file->private_data; |
38231b7a | 131 | int err; |
a7385ba2 EB |
132 | |
133 | ASSERT_RTNL(); | |
134 | ||
38231b7a EB |
135 | netif_tx_lock_bh(tun->dev); |
136 | ||
137 | err = -EINVAL; | |
138 | if (tfile->tun) | |
139 | goto out; | |
140 | ||
141 | err = -EBUSY; | |
142 | if (tun->tfile) | |
143 | goto out; | |
144 | ||
145 | err = 0; | |
631ab46b EB |
146 | tfile->tun = tun; |
147 | tun->tfile = tfile; | |
05c2828c | 148 | tun->socket.file = file; |
c70f1829 | 149 | dev_hold(tun->dev); |
89f56d1e | 150 | sock_hold(tun->socket.sk); |
c70f1829 | 151 | atomic_inc(&tfile->count); |
a7385ba2 | 152 | |
38231b7a EB |
153 | out: |
154 | netif_tx_unlock_bh(tun->dev); | |
155 | return err; | |
a7385ba2 EB |
156 | } |
157 | ||
631ab46b EB |
158 | static void __tun_detach(struct tun_struct *tun) |
159 | { | |
631ab46b | 160 | /* Detach from net device */ |
38231b7a | 161 | netif_tx_lock_bh(tun->dev); |
631ab46b | 162 | tun->tfile = NULL; |
05c2828c | 163 | tun->socket.file = NULL; |
38231b7a | 164 | netif_tx_unlock_bh(tun->dev); |
631ab46b EB |
165 | |
166 | /* Drop read queue */ | |
89f56d1e | 167 | skb_queue_purge(&tun->socket.sk->sk_receive_queue); |
c70f1829 EB |
168 | |
169 | /* Drop the extra count on the net device */ | |
170 | dev_put(tun->dev); | |
171 | } | |
172 | ||
173 | static void tun_detach(struct tun_struct *tun) | |
174 | { | |
175 | rtnl_lock(); | |
176 | __tun_detach(tun); | |
177 | rtnl_unlock(); | |
631ab46b EB |
178 | } |
179 | ||
180 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
181 | { | |
c70f1829 EB |
182 | struct tun_struct *tun = NULL; |
183 | ||
184 | if (atomic_inc_not_zero(&tfile->count)) | |
185 | tun = tfile->tun; | |
186 | ||
187 | return tun; | |
631ab46b EB |
188 | } |
189 | ||
190 | static struct tun_struct *tun_get(struct file *file) | |
191 | { | |
192 | return __tun_get(file->private_data); | |
193 | } | |
194 | ||
195 | static void tun_put(struct tun_struct *tun) | |
196 | { | |
c70f1829 EB |
197 | struct tun_file *tfile = tun->tfile; |
198 | ||
199 | if (atomic_dec_and_test(&tfile->count)) | |
200 | tun_detach(tfile->tun); | |
631ab46b EB |
201 | } |
202 | ||
f271b2cc MK |
203 | /* TAP filterting */ |
204 | static void addr_hash_set(u32 *mask, const u8 *addr) | |
205 | { | |
206 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
207 | mask[n >> 5] |= (1 << (n & 31)); | |
208 | } | |
209 | ||
210 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
211 | { | |
212 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
213 | return mask[n >> 5] & (1 << (n & 31)); | |
214 | } | |
215 | ||
216 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
217 | { | |
218 | struct { u8 u[ETH_ALEN]; } *addr; | |
219 | struct tun_filter uf; | |
220 | int err, alen, n, nexact; | |
221 | ||
222 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
223 | return -EFAULT; | |
224 | ||
225 | if (!uf.count) { | |
226 | /* Disabled */ | |
227 | filter->count = 0; | |
228 | return 0; | |
229 | } | |
230 | ||
231 | alen = ETH_ALEN * uf.count; | |
232 | addr = kmalloc(alen, GFP_KERNEL); | |
233 | if (!addr) | |
234 | return -ENOMEM; | |
235 | ||
236 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
237 | err = -EFAULT; | |
238 | goto done; | |
239 | } | |
240 | ||
241 | /* The filter is updated without holding any locks. Which is | |
242 | * perfectly safe. We disable it first and in the worst | |
243 | * case we'll accept a few undesired packets. */ | |
244 | filter->count = 0; | |
245 | wmb(); | |
246 | ||
247 | /* Use first set of addresses as an exact filter */ | |
248 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
249 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
250 | ||
251 | nexact = n; | |
252 | ||
cfbf84fc AW |
253 | /* Remaining multicast addresses are hashed, |
254 | * unicast will leave the filter disabled. */ | |
f271b2cc | 255 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
256 | for (; n < uf.count; n++) { |
257 | if (!is_multicast_ether_addr(addr[n].u)) { | |
258 | err = 0; /* no filter */ | |
259 | goto done; | |
260 | } | |
f271b2cc | 261 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 262 | } |
f271b2cc MK |
263 | |
264 | /* For ALLMULTI just set the mask to all ones. | |
265 | * This overrides the mask populated above. */ | |
266 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
267 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
268 | ||
269 | /* Now enable the filter */ | |
270 | wmb(); | |
271 | filter->count = nexact; | |
272 | ||
273 | /* Return the number of exact filters */ | |
274 | err = nexact; | |
275 | ||
276 | done: | |
277 | kfree(addr); | |
278 | return err; | |
279 | } | |
280 | ||
281 | /* Returns: 0 - drop, !=0 - accept */ | |
282 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
283 | { | |
284 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
285 | * at this point. */ | |
286 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
287 | int i; | |
288 | ||
289 | /* Exact match */ | |
290 | for (i = 0; i < filter->count; i++) | |
291 | if (!compare_ether_addr(eh->h_dest, filter->addr[i])) | |
292 | return 1; | |
293 | ||
294 | /* Inexact match (multicast only) */ | |
295 | if (is_multicast_ether_addr(eh->h_dest)) | |
296 | return addr_hash_test(filter->mask, eh->h_dest); | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | /* | |
302 | * Checks whether the packet is accepted or not. | |
303 | * Returns: 0 - drop, !=0 - accept | |
304 | */ | |
305 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
306 | { | |
307 | if (!filter->count) | |
308 | return 1; | |
309 | ||
310 | return run_filter(filter, skb); | |
311 | } | |
312 | ||
1da177e4 LT |
313 | /* Network device part of the driver */ |
314 | ||
7282d491 | 315 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 316 | |
c70f1829 EB |
317 | /* Net device detach from fd. */ |
318 | static void tun_net_uninit(struct net_device *dev) | |
319 | { | |
320 | struct tun_struct *tun = netdev_priv(dev); | |
321 | struct tun_file *tfile = tun->tfile; | |
322 | ||
323 | /* Inform the methods they need to stop using the dev. | |
324 | */ | |
325 | if (tfile) { | |
43815482 | 326 | wake_up_all(&tun->wq.wait); |
c70f1829 EB |
327 | if (atomic_dec_and_test(&tfile->count)) |
328 | __tun_detach(tun); | |
329 | } | |
330 | } | |
331 | ||
9c3fea6a HX |
332 | static void tun_free_netdev(struct net_device *dev) |
333 | { | |
334 | struct tun_struct *tun = netdev_priv(dev); | |
335 | ||
89f56d1e | 336 | sock_put(tun->socket.sk); |
9c3fea6a HX |
337 | } |
338 | ||
1da177e4 LT |
339 | /* Net device open. */ |
340 | static int tun_net_open(struct net_device *dev) | |
341 | { | |
342 | netif_start_queue(dev); | |
343 | return 0; | |
344 | } | |
345 | ||
346 | /* Net device close. */ | |
347 | static int tun_net_close(struct net_device *dev) | |
348 | { | |
349 | netif_stop_queue(dev); | |
350 | return 0; | |
351 | } | |
352 | ||
353 | /* Net device start xmit */ | |
424efe9c | 354 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
355 | { |
356 | struct tun_struct *tun = netdev_priv(dev); | |
357 | ||
358 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); | |
359 | ||
360 | /* Drop packet if interface is not attached */ | |
631ab46b | 361 | if (!tun->tfile) |
1da177e4 LT |
362 | goto drop; |
363 | ||
f271b2cc MK |
364 | /* Drop if the filter does not like it. |
365 | * This is a noop if the filter is disabled. | |
366 | * Filter can be enabled only for the TAP devices. */ | |
367 | if (!check_filter(&tun->txflt, skb)) | |
368 | goto drop; | |
369 | ||
99405162 MT |
370 | if (tun->socket.sk->sk_filter && |
371 | sk_filter(tun->socket.sk, skb)) | |
372 | goto drop; | |
373 | ||
89f56d1e | 374 | if (skb_queue_len(&tun->socket.sk->sk_receive_queue) >= dev->tx_queue_len) { |
1da177e4 LT |
375 | if (!(tun->flags & TUN_ONE_QUEUE)) { |
376 | /* Normal queueing mode. */ | |
377 | /* Packet scheduler handles dropping of further packets. */ | |
378 | netif_stop_queue(dev); | |
379 | ||
380 | /* We won't see all dropped packets individually, so overrun | |
381 | * error is more appropriate. */ | |
09f75cd7 | 382 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
383 | } else { |
384 | /* Single queue mode. | |
385 | * Driver handles dropping of all packets itself. */ | |
386 | goto drop; | |
387 | } | |
388 | } | |
389 | ||
0110d6f2 MT |
390 | /* Orphan the skb - required as we might hang on to it |
391 | * for indefinite time. */ | |
392 | skb_orphan(skb); | |
393 | ||
f271b2cc | 394 | /* Enqueue packet */ |
89f56d1e | 395 | skb_queue_tail(&tun->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
396 | dev->trans_start = jiffies; |
397 | ||
398 | /* Notify and wake up reader process */ | |
399 | if (tun->flags & TUN_FASYNC) | |
400 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
43815482 | 401 | wake_up_interruptible_poll(&tun->wq.wait, POLLIN | |
05c2828c | 402 | POLLRDNORM | POLLRDBAND); |
6ed10654 | 403 | return NETDEV_TX_OK; |
1da177e4 LT |
404 | |
405 | drop: | |
09f75cd7 | 406 | dev->stats.tx_dropped++; |
1da177e4 | 407 | kfree_skb(skb); |
6ed10654 | 408 | return NETDEV_TX_OK; |
1da177e4 LT |
409 | } |
410 | ||
f271b2cc | 411 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 412 | { |
f271b2cc MK |
413 | /* |
414 | * This callback is supposed to deal with mc filter in | |
415 | * _rx_ path and has nothing to do with the _tx_ path. | |
416 | * In rx path we always accept everything userspace gives us. | |
417 | */ | |
418 | return; | |
1da177e4 LT |
419 | } |
420 | ||
4885a504 ES |
421 | #define MIN_MTU 68 |
422 | #define MAX_MTU 65535 | |
423 | ||
424 | static int | |
425 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
426 | { | |
427 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
428 | return -EINVAL; | |
429 | dev->mtu = new_mtu; | |
430 | return 0; | |
431 | } | |
432 | ||
758e43b7 | 433 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 434 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
435 | .ndo_open = tun_net_open, |
436 | .ndo_stop = tun_net_close, | |
00829823 | 437 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 438 | .ndo_change_mtu = tun_net_change_mtu, |
758e43b7 SH |
439 | }; |
440 | ||
441 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 442 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
443 | .ndo_open = tun_net_open, |
444 | .ndo_stop = tun_net_close, | |
00829823 | 445 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 SH |
446 | .ndo_change_mtu = tun_net_change_mtu, |
447 | .ndo_set_multicast_list = tun_net_mclist, | |
448 | .ndo_set_mac_address = eth_mac_addr, | |
449 | .ndo_validate_addr = eth_validate_addr, | |
450 | }; | |
451 | ||
1da177e4 LT |
452 | /* Initialize net device. */ |
453 | static void tun_net_init(struct net_device *dev) | |
454 | { | |
455 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 456 | |
1da177e4 LT |
457 | switch (tun->flags & TUN_TYPE_MASK) { |
458 | case TUN_TUN_DEV: | |
758e43b7 SH |
459 | dev->netdev_ops = &tun_netdev_ops; |
460 | ||
1da177e4 LT |
461 | /* Point-to-Point TUN Device */ |
462 | dev->hard_header_len = 0; | |
463 | dev->addr_len = 0; | |
464 | dev->mtu = 1500; | |
465 | ||
466 | /* Zero header length */ | |
6aa20a22 | 467 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
468 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
469 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
470 | break; | |
471 | ||
472 | case TUN_TAP_DEV: | |
7a0a9608 | 473 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 474 | /* Ethernet TAP Device */ |
1da177e4 | 475 | ether_setup(dev); |
36226a8d | 476 | |
f271b2cc | 477 | random_ether_addr(dev->dev_addr); |
36226a8d | 478 | |
1da177e4 LT |
479 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
480 | break; | |
481 | } | |
482 | } | |
483 | ||
484 | /* Character device part */ | |
485 | ||
486 | /* Poll */ | |
487 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 488 | { |
b2430de3 EB |
489 | struct tun_file *tfile = file->private_data; |
490 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 491 | struct sock *sk; |
33dccbb0 | 492 | unsigned int mask = 0; |
1da177e4 LT |
493 | |
494 | if (!tun) | |
eac9e902 | 495 | return POLLERR; |
1da177e4 | 496 | |
89f56d1e | 497 | sk = tun->socket.sk; |
3c8a9c63 | 498 | |
1da177e4 LT |
499 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); |
500 | ||
43815482 | 501 | poll_wait(file, &tun->wq.wait, wait); |
6aa20a22 | 502 | |
89f56d1e | 503 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
504 | mask |= POLLIN | POLLRDNORM; |
505 | ||
33dccbb0 HX |
506 | if (sock_writeable(sk) || |
507 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
508 | sock_writeable(sk))) | |
509 | mask |= POLLOUT | POLLWRNORM; | |
510 | ||
c70f1829 EB |
511 | if (tun->dev->reg_state != NETREG_REGISTERED) |
512 | mask = POLLERR; | |
513 | ||
631ab46b | 514 | tun_put(tun); |
1da177e4 LT |
515 | return mask; |
516 | } | |
517 | ||
f42157cb RR |
518 | /* prepad is the amount to reserve at front. len is length after that. |
519 | * linear is a hint as to how much to copy (usually headers). */ | |
33dccbb0 HX |
520 | static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun, |
521 | size_t prepad, size_t len, | |
522 | size_t linear, int noblock) | |
f42157cb | 523 | { |
89f56d1e | 524 | struct sock *sk = tun->socket.sk; |
f42157cb | 525 | struct sk_buff *skb; |
33dccbb0 | 526 | int err; |
f42157cb RR |
527 | |
528 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 529 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 530 | linear = len; |
f42157cb | 531 | |
33dccbb0 HX |
532 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
533 | &err); | |
f42157cb | 534 | if (!skb) |
33dccbb0 | 535 | return ERR_PTR(err); |
f42157cb RR |
536 | |
537 | skb_reserve(skb, prepad); | |
538 | skb_put(skb, linear); | |
33dccbb0 HX |
539 | skb->data_len = len - linear; |
540 | skb->len += len - linear; | |
f42157cb RR |
541 | |
542 | return skb; | |
543 | } | |
544 | ||
1da177e4 | 545 | /* Get packet from user space buffer */ |
33dccbb0 | 546 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, |
6f26c9a7 | 547 | const struct iovec *iv, size_t count, |
33dccbb0 | 548 | int noblock) |
1da177e4 | 549 | { |
09640e63 | 550 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 LT |
551 | struct sk_buff *skb; |
552 | size_t len = count, align = 0; | |
f43798c2 | 553 | struct virtio_net_hdr gso = { 0 }; |
6f26c9a7 | 554 | int offset = 0; |
1da177e4 LT |
555 | |
556 | if (!(tun->flags & TUN_NO_PI)) { | |
557 | if ((len -= sizeof(pi)) > count) | |
558 | return -EINVAL; | |
559 | ||
6f26c9a7 | 560 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 561 | return -EFAULT; |
6f26c9a7 | 562 | offset += sizeof(pi); |
1da177e4 LT |
563 | } |
564 | ||
f43798c2 RR |
565 | if (tun->flags & TUN_VNET_HDR) { |
566 | if ((len -= sizeof(gso)) > count) | |
567 | return -EINVAL; | |
568 | ||
6f26c9a7 | 569 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
570 | return -EFAULT; |
571 | ||
4909122f HX |
572 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
573 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
574 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
575 | ||
f43798c2 RR |
576 | if (gso.hdr_len > len) |
577 | return -EINVAL; | |
6f536f40 | 578 | offset += sizeof(gso); |
f43798c2 RR |
579 | } |
580 | ||
e01bf1c8 | 581 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
1da177e4 | 582 | align = NET_IP_ALIGN; |
0eca93bc HX |
583 | if (unlikely(len < ETH_HLEN || |
584 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
585 | return -EINVAL; |
586 | } | |
6aa20a22 | 587 | |
33dccbb0 HX |
588 | skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock); |
589 | if (IS_ERR(skb)) { | |
590 | if (PTR_ERR(skb) != -EAGAIN) | |
591 | tun->dev->stats.rx_dropped++; | |
592 | return PTR_ERR(skb); | |
1da177e4 LT |
593 | } |
594 | ||
6f26c9a7 | 595 | if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) { |
09f75cd7 | 596 | tun->dev->stats.rx_dropped++; |
8f22757e | 597 | kfree_skb(skb); |
1da177e4 | 598 | return -EFAULT; |
8f22757e | 599 | } |
1da177e4 | 600 | |
f43798c2 RR |
601 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
602 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
603 | gso.csum_offset)) { | |
604 | tun->dev->stats.rx_frame_errors++; | |
605 | kfree_skb(skb); | |
606 | return -EINVAL; | |
607 | } | |
608 | } else if (tun->flags & TUN_NOCHECKSUM) | |
609 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
610 | ||
1da177e4 LT |
611 | switch (tun->flags & TUN_TYPE_MASK) { |
612 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
613 | if (tun->flags & TUN_NO_PI) { |
614 | switch (skb->data[0] & 0xf0) { | |
615 | case 0x40: | |
616 | pi.proto = htons(ETH_P_IP); | |
617 | break; | |
618 | case 0x60: | |
619 | pi.proto = htons(ETH_P_IPV6); | |
620 | break; | |
621 | default: | |
622 | tun->dev->stats.rx_dropped++; | |
623 | kfree_skb(skb); | |
624 | return -EINVAL; | |
625 | } | |
626 | } | |
627 | ||
459a98ed | 628 | skb_reset_mac_header(skb); |
1da177e4 | 629 | skb->protocol = pi.proto; |
4c13eb66 | 630 | skb->dev = tun->dev; |
1da177e4 LT |
631 | break; |
632 | case TUN_TAP_DEV: | |
633 | skb->protocol = eth_type_trans(skb, tun->dev); | |
634 | break; | |
635 | }; | |
636 | ||
f43798c2 RR |
637 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
638 | pr_debug("GSO!\n"); | |
639 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
640 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
641 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
642 | break; | |
643 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
644 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
645 | break; | |
e36aa25a SS |
646 | case VIRTIO_NET_HDR_GSO_UDP: |
647 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
648 | break; | |
f43798c2 RR |
649 | default: |
650 | tun->dev->stats.rx_frame_errors++; | |
651 | kfree_skb(skb); | |
652 | return -EINVAL; | |
653 | } | |
654 | ||
655 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
656 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
657 | ||
658 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
659 | if (skb_shinfo(skb)->gso_size == 0) { | |
660 | tun->dev->stats.rx_frame_errors++; | |
661 | kfree_skb(skb); | |
662 | return -EINVAL; | |
663 | } | |
664 | ||
665 | /* Header must be checked, and gso_segs computed. */ | |
666 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
667 | skb_shinfo(skb)->gso_segs = 0; | |
668 | } | |
6aa20a22 | 669 | |
1da177e4 | 670 | netif_rx_ni(skb); |
6aa20a22 | 671 | |
09f75cd7 JG |
672 | tun->dev->stats.rx_packets++; |
673 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
674 | |
675 | return count; | |
6aa20a22 | 676 | } |
1da177e4 | 677 | |
ee0b3e67 BP |
678 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
679 | unsigned long count, loff_t pos) | |
1da177e4 | 680 | { |
33dccbb0 | 681 | struct file *file = iocb->ki_filp; |
ab46d779 | 682 | struct tun_struct *tun = tun_get(file); |
631ab46b | 683 | ssize_t result; |
1da177e4 LT |
684 | |
685 | if (!tun) | |
686 | return -EBADFD; | |
687 | ||
688 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
689 | ||
6f26c9a7 | 690 | result = tun_get_user(tun, iv, iov_length(iv, count), |
33dccbb0 | 691 | file->f_flags & O_NONBLOCK); |
631ab46b EB |
692 | |
693 | tun_put(tun); | |
694 | return result; | |
1da177e4 LT |
695 | } |
696 | ||
1da177e4 LT |
697 | /* Put packet to the user space buffer */ |
698 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
699 | struct sk_buff *skb, | |
43b39dcd | 700 | const struct iovec *iv, int len) |
1da177e4 LT |
701 | { |
702 | struct tun_pi pi = { 0, skb->protocol }; | |
703 | ssize_t total = 0; | |
704 | ||
705 | if (!(tun->flags & TUN_NO_PI)) { | |
706 | if ((len -= sizeof(pi)) < 0) | |
707 | return -EINVAL; | |
708 | ||
709 | if (len < skb->len) { | |
710 | /* Packet will be striped */ | |
711 | pi.flags |= TUN_PKT_STRIP; | |
712 | } | |
6aa20a22 | 713 | |
43b39dcd | 714 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
715 | return -EFAULT; |
716 | total += sizeof(pi); | |
6aa20a22 | 717 | } |
1da177e4 | 718 | |
f43798c2 RR |
719 | if (tun->flags & TUN_VNET_HDR) { |
720 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
721 | if ((len -= sizeof(gso)) < 0) | |
722 | return -EINVAL; | |
723 | ||
724 | if (skb_is_gso(skb)) { | |
725 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
726 | ||
727 | /* This is a hint as to how much should be linear. */ | |
728 | gso.hdr_len = skb_headlen(skb); | |
729 | gso.gso_size = sinfo->gso_size; | |
730 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
731 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
732 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
733 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e36aa25a SS |
734 | else if (sinfo->gso_type & SKB_GSO_UDP) |
735 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
f43798c2 RR |
736 | else |
737 | BUG(); | |
738 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
739 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
740 | } else | |
741 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
742 | ||
743 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
744 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
745 | gso.csum_start = skb->csum_start - skb_headroom(skb); | |
746 | gso.csum_offset = skb->csum_offset; | |
747 | } /* else everything is zero */ | |
748 | ||
43b39dcd MT |
749 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
750 | sizeof(gso)))) | |
f43798c2 RR |
751 | return -EFAULT; |
752 | total += sizeof(gso); | |
753 | } | |
754 | ||
1da177e4 LT |
755 | len = min_t(int, skb->len, len); |
756 | ||
43b39dcd | 757 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
05c2828c | 758 | total += skb->len; |
1da177e4 | 759 | |
09f75cd7 JG |
760 | tun->dev->stats.tx_packets++; |
761 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
762 | |
763 | return total; | |
764 | } | |
765 | ||
05c2828c MT |
766 | static ssize_t tun_do_read(struct tun_struct *tun, |
767 | struct kiocb *iocb, const struct iovec *iv, | |
768 | ssize_t len, int noblock) | |
1da177e4 | 769 | { |
1da177e4 LT |
770 | DECLARE_WAITQUEUE(wait, current); |
771 | struct sk_buff *skb; | |
05c2828c | 772 | ssize_t ret = 0; |
1da177e4 LT |
773 | |
774 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
775 | ||
43815482 | 776 | add_wait_queue(&tun->wq.wait, &wait); |
1da177e4 | 777 | while (len) { |
1da177e4 LT |
778 | current->state = TASK_INTERRUPTIBLE; |
779 | ||
780 | /* Read frames from the queue */ | |
89f56d1e | 781 | if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) { |
05c2828c | 782 | if (noblock) { |
1da177e4 LT |
783 | ret = -EAGAIN; |
784 | break; | |
785 | } | |
786 | if (signal_pending(current)) { | |
787 | ret = -ERESTARTSYS; | |
788 | break; | |
789 | } | |
c70f1829 EB |
790 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
791 | ret = -EIO; | |
792 | break; | |
793 | } | |
1da177e4 LT |
794 | |
795 | /* Nothing to read, let's sleep */ | |
796 | schedule(); | |
797 | continue; | |
798 | } | |
799 | netif_wake_queue(tun->dev); | |
800 | ||
43b39dcd | 801 | ret = tun_put_user(tun, skb, iv, len); |
f271b2cc MK |
802 | kfree_skb(skb); |
803 | break; | |
1da177e4 LT |
804 | } |
805 | ||
806 | current->state = TASK_RUNNING; | |
43815482 | 807 | remove_wait_queue(&tun->wq.wait, &wait); |
1da177e4 | 808 | |
05c2828c MT |
809 | return ret; |
810 | } | |
811 | ||
812 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
813 | unsigned long count, loff_t pos) | |
814 | { | |
815 | struct file *file = iocb->ki_filp; | |
816 | struct tun_file *tfile = file->private_data; | |
817 | struct tun_struct *tun = __tun_get(tfile); | |
818 | ssize_t len, ret; | |
819 | ||
820 | if (!tun) | |
821 | return -EBADFD; | |
822 | len = iov_length(iv, count); | |
823 | if (len < 0) { | |
824 | ret = -EINVAL; | |
825 | goto out; | |
826 | } | |
827 | ||
828 | ret = tun_do_read(tun, iocb, iv, len, file->f_flags & O_NONBLOCK); | |
829 | ret = min_t(ssize_t, ret, len); | |
631ab46b EB |
830 | out: |
831 | tun_put(tun); | |
1da177e4 LT |
832 | return ret; |
833 | } | |
834 | ||
1da177e4 LT |
835 | static void tun_setup(struct net_device *dev) |
836 | { | |
837 | struct tun_struct *tun = netdev_priv(dev); | |
838 | ||
1da177e4 | 839 | tun->owner = -1; |
8c644623 | 840 | tun->group = -1; |
1da177e4 | 841 | |
1da177e4 | 842 | dev->ethtool_ops = &tun_ethtool_ops; |
9c3fea6a | 843 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
844 | } |
845 | ||
f019a7a5 EB |
846 | /* Trivial set of netlink ops to allow deleting tun or tap |
847 | * device with netlink. | |
848 | */ | |
849 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
850 | { | |
851 | return -EINVAL; | |
852 | } | |
853 | ||
854 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
855 | .kind = DRV_NAME, | |
856 | .priv_size = sizeof(struct tun_struct), | |
857 | .setup = tun_setup, | |
858 | .validate = tun_validate, | |
859 | }; | |
860 | ||
33dccbb0 HX |
861 | static void tun_sock_write_space(struct sock *sk) |
862 | { | |
863 | struct tun_struct *tun; | |
43815482 | 864 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
865 | |
866 | if (!sock_writeable(sk)) | |
867 | return; | |
868 | ||
33dccbb0 HX |
869 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
870 | return; | |
871 | ||
43815482 ED |
872 | wqueue = sk_sleep(sk); |
873 | if (wqueue && waitqueue_active(wqueue)) | |
874 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 875 | POLLWRNORM | POLLWRBAND); |
c722c625 | 876 | |
80924e5f | 877 | tun = tun_sk(sk)->tun; |
33dccbb0 HX |
878 | kill_fasync(&tun->fasync, SIGIO, POLL_OUT); |
879 | } | |
880 | ||
881 | static void tun_sock_destruct(struct sock *sk) | |
882 | { | |
80924e5f | 883 | free_netdev(tun_sk(sk)->tun->dev); |
33dccbb0 HX |
884 | } |
885 | ||
05c2828c MT |
886 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
887 | struct msghdr *m, size_t total_len) | |
888 | { | |
889 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
890 | return tun_get_user(tun, m->msg_iov, total_len, | |
891 | m->msg_flags & MSG_DONTWAIT); | |
892 | } | |
893 | ||
894 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, | |
895 | struct msghdr *m, size_t total_len, | |
896 | int flags) | |
897 | { | |
898 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
899 | int ret; | |
900 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) | |
901 | return -EINVAL; | |
902 | ret = tun_do_read(tun, iocb, m->msg_iov, total_len, | |
903 | flags & MSG_DONTWAIT); | |
904 | if (ret > total_len) { | |
905 | m->msg_flags |= MSG_TRUNC; | |
906 | ret = flags & MSG_TRUNC ? ret : total_len; | |
907 | } | |
908 | return ret; | |
909 | } | |
910 | ||
911 | /* Ops structure to mimic raw sockets with tun */ | |
912 | static const struct proto_ops tun_socket_ops = { | |
913 | .sendmsg = tun_sendmsg, | |
914 | .recvmsg = tun_recvmsg, | |
915 | }; | |
916 | ||
33dccbb0 HX |
917 | static struct proto tun_proto = { |
918 | .name = "tun", | |
919 | .owner = THIS_MODULE, | |
920 | .obj_size = sizeof(struct tun_sock), | |
921 | }; | |
f019a7a5 | 922 | |
980c9e8c DW |
923 | static int tun_flags(struct tun_struct *tun) |
924 | { | |
925 | int flags = 0; | |
926 | ||
927 | if (tun->flags & TUN_TUN_DEV) | |
928 | flags |= IFF_TUN; | |
929 | else | |
930 | flags |= IFF_TAP; | |
931 | ||
932 | if (tun->flags & TUN_NO_PI) | |
933 | flags |= IFF_NO_PI; | |
934 | ||
935 | if (tun->flags & TUN_ONE_QUEUE) | |
936 | flags |= IFF_ONE_QUEUE; | |
937 | ||
938 | if (tun->flags & TUN_VNET_HDR) | |
939 | flags |= IFF_VNET_HDR; | |
940 | ||
941 | return flags; | |
942 | } | |
943 | ||
944 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
945 | char *buf) | |
946 | { | |
947 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
948 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
949 | } | |
950 | ||
951 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
952 | char *buf) | |
953 | { | |
954 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
955 | return sprintf(buf, "%d\n", tun->owner); | |
956 | } | |
957 | ||
958 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
959 | char *buf) | |
960 | { | |
961 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
962 | return sprintf(buf, "%d\n", tun->group); | |
963 | } | |
964 | ||
965 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
966 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
967 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
968 | ||
d647a591 | 969 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 | 970 | { |
33dccbb0 | 971 | struct sock *sk; |
1da177e4 LT |
972 | struct tun_struct *tun; |
973 | struct net_device *dev; | |
974 | int err; | |
975 | ||
74a3e5a7 EB |
976 | dev = __dev_get_by_name(net, ifr->ifr_name); |
977 | if (dev) { | |
2b980dbd PM |
978 | const struct cred *cred = current_cred(); |
979 | ||
f85ba780 DW |
980 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
981 | return -EBUSY; | |
74a3e5a7 EB |
982 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
983 | tun = netdev_priv(dev); | |
984 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
985 | tun = netdev_priv(dev); | |
986 | else | |
987 | return -EINVAL; | |
988 | ||
2b980dbd PM |
989 | if (((tun->owner != -1 && cred->euid != tun->owner) || |
990 | (tun->group != -1 && !in_egroup_p(tun->group))) && | |
991 | !capable(CAP_NET_ADMIN)) | |
992 | return -EPERM; | |
d7e9660a | 993 | err = security_tun_dev_attach(tun->socket.sk); |
2b980dbd PM |
994 | if (err < 0) |
995 | return err; | |
996 | ||
a7385ba2 EB |
997 | err = tun_attach(tun, file); |
998 | if (err < 0) | |
999 | return err; | |
6aa20a22 | 1000 | } |
1da177e4 LT |
1001 | else { |
1002 | char *name; | |
1003 | unsigned long flags = 0; | |
1004 | ||
ca6bb5d7 DW |
1005 | if (!capable(CAP_NET_ADMIN)) |
1006 | return -EPERM; | |
2b980dbd PM |
1007 | err = security_tun_dev_create(); |
1008 | if (err < 0) | |
1009 | return err; | |
ca6bb5d7 | 1010 | |
1da177e4 LT |
1011 | /* Set dev type */ |
1012 | if (ifr->ifr_flags & IFF_TUN) { | |
1013 | /* TUN device */ | |
1014 | flags |= TUN_TUN_DEV; | |
1015 | name = "tun%d"; | |
1016 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1017 | /* TAP device */ | |
1018 | flags |= TUN_TAP_DEV; | |
1019 | name = "tap%d"; | |
6aa20a22 | 1020 | } else |
36989b90 | 1021 | return -EINVAL; |
6aa20a22 | 1022 | |
1da177e4 LT |
1023 | if (*ifr->ifr_name) |
1024 | name = ifr->ifr_name; | |
1025 | ||
1026 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
1027 | tun_setup); | |
1028 | if (!dev) | |
1029 | return -ENOMEM; | |
1030 | ||
fc54c658 | 1031 | dev_net_set(dev, net); |
f019a7a5 | 1032 | dev->rtnl_link_ops = &tun_link_ops; |
758e43b7 | 1033 | |
1da177e4 LT |
1034 | tun = netdev_priv(dev); |
1035 | tun->dev = dev; | |
1036 | tun->flags = flags; | |
f271b2cc | 1037 | tun->txflt.count = 0; |
1da177e4 | 1038 | |
33dccbb0 HX |
1039 | err = -ENOMEM; |
1040 | sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto); | |
1041 | if (!sk) | |
1042 | goto err_free_dev; | |
1043 | ||
43815482 ED |
1044 | tun->socket.wq = &tun->wq; |
1045 | init_waitqueue_head(&tun->wq.wait); | |
05c2828c | 1046 | tun->socket.ops = &tun_socket_ops; |
33dccbb0 HX |
1047 | sock_init_data(&tun->socket, sk); |
1048 | sk->sk_write_space = tun_sock_write_space; | |
33dccbb0 | 1049 | sk->sk_sndbuf = INT_MAX; |
33dccbb0 | 1050 | |
80924e5f | 1051 | tun_sk(sk)->tun = tun; |
33dccbb0 | 1052 | |
2b980dbd PM |
1053 | security_tun_dev_post_create(sk); |
1054 | ||
1da177e4 LT |
1055 | tun_net_init(dev); |
1056 | ||
1057 | if (strchr(dev->name, '%')) { | |
1058 | err = dev_alloc_name(dev, dev->name); | |
1059 | if (err < 0) | |
33dccbb0 | 1060 | goto err_free_sk; |
1da177e4 LT |
1061 | } |
1062 | ||
1063 | err = register_netdevice(tun->dev); | |
1064 | if (err < 0) | |
9c3fea6a HX |
1065 | goto err_free_sk; |
1066 | ||
980c9e8c DW |
1067 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1068 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1069 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
1070 | printk(KERN_ERR "Failed to create tun sysfs files\n"); | |
1071 | ||
9c3fea6a | 1072 | sk->sk_destruct = tun_sock_destruct; |
a7385ba2 EB |
1073 | |
1074 | err = tun_attach(tun, file); | |
1075 | if (err < 0) | |
9c3fea6a | 1076 | goto failed; |
1da177e4 LT |
1077 | } |
1078 | ||
1079 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
1080 | ||
1081 | if (ifr->ifr_flags & IFF_NO_PI) | |
1082 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1083 | else |
1084 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
1085 | |
1086 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
1087 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1088 | else |
1089 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1090 | |
f43798c2 RR |
1091 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1092 | tun->flags |= TUN_VNET_HDR; | |
1093 | else | |
1094 | tun->flags &= ~TUN_VNET_HDR; | |
1095 | ||
e35259a9 MK |
1096 | /* Make sure persistent devices do not get stuck in |
1097 | * xoff state. | |
1098 | */ | |
1099 | if (netif_running(tun->dev)) | |
1100 | netif_wake_queue(tun->dev); | |
1101 | ||
1da177e4 LT |
1102 | strcpy(ifr->ifr_name, tun->dev->name); |
1103 | return 0; | |
1104 | ||
33dccbb0 HX |
1105 | err_free_sk: |
1106 | sock_put(sk); | |
1da177e4 LT |
1107 | err_free_dev: |
1108 | free_netdev(dev); | |
1109 | failed: | |
1110 | return err; | |
1111 | } | |
1112 | ||
876bfd4d HX |
1113 | static int tun_get_iff(struct net *net, struct tun_struct *tun, |
1114 | struct ifreq *ifr) | |
e3b99556 | 1115 | { |
e3b99556 MM |
1116 | DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name); |
1117 | ||
1118 | strcpy(ifr->ifr_name, tun->dev->name); | |
1119 | ||
980c9e8c | 1120 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 MM |
1121 | |
1122 | return 0; | |
1123 | } | |
1124 | ||
5228ddc9 RR |
1125 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1126 | * privs required. */ | |
1127 | static int set_offload(struct net_device *dev, unsigned long arg) | |
1128 | { | |
1129 | unsigned int old_features, features; | |
1130 | ||
1131 | old_features = dev->features; | |
1132 | /* Unset features, set them as we chew on the arg. */ | |
1133 | features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST | |
e36aa25a SS |
1134 | |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6 |
1135 | |NETIF_F_UFO)); | |
5228ddc9 RR |
1136 | |
1137 | if (arg & TUN_F_CSUM) { | |
1138 | features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1139 | arg &= ~TUN_F_CSUM; | |
1140 | ||
1141 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1142 | if (arg & TUN_F_TSO_ECN) { | |
1143 | features |= NETIF_F_TSO_ECN; | |
1144 | arg &= ~TUN_F_TSO_ECN; | |
1145 | } | |
1146 | if (arg & TUN_F_TSO4) | |
1147 | features |= NETIF_F_TSO; | |
1148 | if (arg & TUN_F_TSO6) | |
1149 | features |= NETIF_F_TSO6; | |
1150 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1151 | } | |
e36aa25a SS |
1152 | |
1153 | if (arg & TUN_F_UFO) { | |
1154 | features |= NETIF_F_UFO; | |
1155 | arg &= ~TUN_F_UFO; | |
1156 | } | |
5228ddc9 RR |
1157 | } |
1158 | ||
1159 | /* This gives the user a way to test for new features in future by | |
1160 | * trying to set them. */ | |
1161 | if (arg) | |
1162 | return -EINVAL; | |
1163 | ||
1164 | dev->features = features; | |
1165 | if (old_features != dev->features) | |
1166 | netdev_features_change(dev); | |
1167 | ||
1168 | return 0; | |
1169 | } | |
1170 | ||
50857e2a AB |
1171 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1172 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1173 | { |
36b50bab | 1174 | struct tun_file *tfile = file->private_data; |
631ab46b | 1175 | struct tun_struct *tun; |
1da177e4 | 1176 | void __user* argp = (void __user*)arg; |
99405162 | 1177 | struct sock_fprog fprog; |
1da177e4 | 1178 | struct ifreq ifr; |
33dccbb0 | 1179 | int sndbuf; |
f271b2cc | 1180 | int ret; |
1da177e4 LT |
1181 | |
1182 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
50857e2a | 1183 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 LT |
1184 | return -EFAULT; |
1185 | ||
631ab46b EB |
1186 | if (cmd == TUNGETFEATURES) { |
1187 | /* Currently this just means: "what IFF flags are valid?". | |
1188 | * This is needed because we never checked for invalid flags on | |
1189 | * TUNSETIFF. */ | |
1190 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
1191 | IFF_VNET_HDR, | |
1192 | (unsigned int __user*)argp); | |
1193 | } | |
1194 | ||
876bfd4d HX |
1195 | rtnl_lock(); |
1196 | ||
36b50bab | 1197 | tun = __tun_get(tfile); |
1da177e4 | 1198 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1199 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1200 | ||
876bfd4d | 1201 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1202 | |
876bfd4d HX |
1203 | if (ret) |
1204 | goto unlock; | |
1da177e4 | 1205 | |
50857e2a | 1206 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1207 | ret = -EFAULT; |
1208 | goto unlock; | |
1da177e4 LT |
1209 | } |
1210 | ||
876bfd4d | 1211 | ret = -EBADFD; |
1da177e4 | 1212 | if (!tun) |
876bfd4d | 1213 | goto unlock; |
1da177e4 LT |
1214 | |
1215 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
1216 | ||
631ab46b | 1217 | ret = 0; |
1da177e4 | 1218 | switch (cmd) { |
e3b99556 | 1219 | case TUNGETIFF: |
876bfd4d | 1220 | ret = tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1221 | if (ret) |
631ab46b | 1222 | break; |
e3b99556 | 1223 | |
50857e2a | 1224 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1225 | ret = -EFAULT; |
e3b99556 MM |
1226 | break; |
1227 | ||
1da177e4 LT |
1228 | case TUNSETNOCSUM: |
1229 | /* Disable/Enable checksum */ | |
1230 | if (arg) | |
1231 | tun->flags |= TUN_NOCHECKSUM; | |
1232 | else | |
1233 | tun->flags &= ~TUN_NOCHECKSUM; | |
1234 | ||
1235 | DBG(KERN_INFO "%s: checksum %s\n", | |
1236 | tun->dev->name, arg ? "disabled" : "enabled"); | |
1237 | break; | |
1238 | ||
1239 | case TUNSETPERSIST: | |
1240 | /* Disable/Enable persist mode */ | |
1241 | if (arg) | |
1242 | tun->flags |= TUN_PERSIST; | |
1243 | else | |
1244 | tun->flags &= ~TUN_PERSIST; | |
1245 | ||
1246 | DBG(KERN_INFO "%s: persist %s\n", | |
c6e991de | 1247 | tun->dev->name, arg ? "enabled" : "disabled"); |
1da177e4 LT |
1248 | break; |
1249 | ||
1250 | case TUNSETOWNER: | |
1251 | /* Set owner of the device */ | |
1252 | tun->owner = (uid_t) arg; | |
1253 | ||
1254 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
1255 | break; | |
1256 | ||
8c644623 GG |
1257 | case TUNSETGROUP: |
1258 | /* Set group of the device */ | |
1259 | tun->group= (gid_t) arg; | |
1260 | ||
1261 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); | |
1262 | break; | |
1263 | ||
ff4cc3ac MK |
1264 | case TUNSETLINK: |
1265 | /* Only allow setting the type when the interface is down */ | |
1266 | if (tun->dev->flags & IFF_UP) { | |
1267 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
1268 | tun->dev->name); | |
48abfe05 | 1269 | ret = -EBUSY; |
ff4cc3ac MK |
1270 | } else { |
1271 | tun->dev->type = (int) arg; | |
1272 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
48abfe05 | 1273 | ret = 0; |
ff4cc3ac | 1274 | } |
631ab46b | 1275 | break; |
ff4cc3ac | 1276 | |
1da177e4 LT |
1277 | #ifdef TUN_DEBUG |
1278 | case TUNSETDEBUG: | |
1279 | tun->debug = arg; | |
1280 | break; | |
1281 | #endif | |
5228ddc9 | 1282 | case TUNSETOFFLOAD: |
5228ddc9 | 1283 | ret = set_offload(tun->dev, arg); |
631ab46b | 1284 | break; |
5228ddc9 | 1285 | |
f271b2cc MK |
1286 | case TUNSETTXFILTER: |
1287 | /* Can be set only for TAPs */ | |
631ab46b | 1288 | ret = -EINVAL; |
f271b2cc | 1289 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 1290 | break; |
c0e5a8c2 | 1291 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 1292 | break; |
1da177e4 LT |
1293 | |
1294 | case SIOCGIFHWADDR: | |
f271b2cc MK |
1295 | /* Get hw addres */ |
1296 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); | |
1297 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 1298 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
1299 | ret = -EFAULT; |
1300 | break; | |
1da177e4 LT |
1301 | |
1302 | case SIOCSIFHWADDR: | |
f271b2cc | 1303 | /* Set hw address */ |
e174961c JB |
1304 | DBG(KERN_DEBUG "%s: set hw address: %pM\n", |
1305 | tun->dev->name, ifr.ifr_hwaddr.sa_data); | |
40102371 | 1306 | |
40102371 | 1307 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 1308 | break; |
33dccbb0 HX |
1309 | |
1310 | case TUNGETSNDBUF: | |
89f56d1e | 1311 | sndbuf = tun->socket.sk->sk_sndbuf; |
33dccbb0 HX |
1312 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
1313 | ret = -EFAULT; | |
1314 | break; | |
1315 | ||
1316 | case TUNSETSNDBUF: | |
1317 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
1318 | ret = -EFAULT; | |
1319 | break; | |
1320 | } | |
1321 | ||
89f56d1e | 1322 | tun->socket.sk->sk_sndbuf = sndbuf; |
33dccbb0 HX |
1323 | break; |
1324 | ||
99405162 MT |
1325 | case TUNATTACHFILTER: |
1326 | /* Can be set only for TAPs */ | |
1327 | ret = -EINVAL; | |
1328 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1329 | break; | |
1330 | ret = -EFAULT; | |
1331 | if (copy_from_user(&fprog, argp, sizeof(fprog))) | |
1332 | break; | |
1333 | ||
1334 | ret = sk_attach_filter(&fprog, tun->socket.sk); | |
1335 | break; | |
1336 | ||
1337 | case TUNDETACHFILTER: | |
1338 | /* Can be set only for TAPs */ | |
1339 | ret = -EINVAL; | |
1340 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1341 | break; | |
1342 | ret = sk_detach_filter(tun->socket.sk); | |
1343 | break; | |
1344 | ||
1da177e4 | 1345 | default: |
631ab46b EB |
1346 | ret = -EINVAL; |
1347 | break; | |
1da177e4 LT |
1348 | }; |
1349 | ||
876bfd4d HX |
1350 | unlock: |
1351 | rtnl_unlock(); | |
1352 | if (tun) | |
1353 | tun_put(tun); | |
631ab46b | 1354 | return ret; |
1da177e4 LT |
1355 | } |
1356 | ||
50857e2a AB |
1357 | static long tun_chr_ioctl(struct file *file, |
1358 | unsigned int cmd, unsigned long arg) | |
1359 | { | |
1360 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
1361 | } | |
1362 | ||
1363 | #ifdef CONFIG_COMPAT | |
1364 | static long tun_chr_compat_ioctl(struct file *file, | |
1365 | unsigned int cmd, unsigned long arg) | |
1366 | { | |
1367 | switch (cmd) { | |
1368 | case TUNSETIFF: | |
1369 | case TUNGETIFF: | |
1370 | case TUNSETTXFILTER: | |
1371 | case TUNGETSNDBUF: | |
1372 | case TUNSETSNDBUF: | |
1373 | case SIOCGIFHWADDR: | |
1374 | case SIOCSIFHWADDR: | |
1375 | arg = (unsigned long)compat_ptr(arg); | |
1376 | break; | |
1377 | default: | |
1378 | arg = (compat_ulong_t)arg; | |
1379 | break; | |
1380 | } | |
1381 | ||
1382 | /* | |
1383 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
1384 | * the end of that structure. All fields that are used in this | |
1385 | * driver are compatible though, we don't need to convert the | |
1386 | * contents. | |
1387 | */ | |
1388 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
1389 | } | |
1390 | #endif /* CONFIG_COMPAT */ | |
1391 | ||
1da177e4 LT |
1392 | static int tun_chr_fasync(int fd, struct file *file, int on) |
1393 | { | |
631ab46b | 1394 | struct tun_struct *tun = tun_get(file); |
1da177e4 LT |
1395 | int ret; |
1396 | ||
1397 | if (!tun) | |
1398 | return -EBADFD; | |
1399 | ||
1400 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
1401 | ||
1402 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
9d319522 | 1403 | goto out; |
6aa20a22 | 1404 | |
1da177e4 | 1405 | if (on) { |
609d7fa9 | 1406 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 1407 | if (ret) |
9d319522 | 1408 | goto out; |
1da177e4 | 1409 | tun->flags |= TUN_FASYNC; |
6aa20a22 | 1410 | } else |
1da177e4 | 1411 | tun->flags &= ~TUN_FASYNC; |
9d319522 JC |
1412 | ret = 0; |
1413 | out: | |
631ab46b | 1414 | tun_put(tun); |
9d319522 | 1415 | return ret; |
1da177e4 LT |
1416 | } |
1417 | ||
1418 | static int tun_chr_open(struct inode *inode, struct file * file) | |
1419 | { | |
631ab46b | 1420 | struct tun_file *tfile; |
deed49fb | 1421 | |
1da177e4 | 1422 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); |
631ab46b EB |
1423 | |
1424 | tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); | |
1425 | if (!tfile) | |
1426 | return -ENOMEM; | |
c70f1829 | 1427 | atomic_set(&tfile->count, 0); |
631ab46b | 1428 | tfile->tun = NULL; |
36b50bab | 1429 | tfile->net = get_net(current->nsproxy->net_ns); |
631ab46b | 1430 | file->private_data = tfile; |
1da177e4 LT |
1431 | return 0; |
1432 | } | |
1433 | ||
1434 | static int tun_chr_close(struct inode *inode, struct file *file) | |
1435 | { | |
631ab46b | 1436 | struct tun_file *tfile = file->private_data; |
f0a4d0e5 | 1437 | struct tun_struct *tun; |
1da177e4 | 1438 | |
f0a4d0e5 | 1439 | tun = __tun_get(tfile); |
631ab46b | 1440 | if (tun) { |
d23e4365 HX |
1441 | struct net_device *dev = tun->dev; |
1442 | ||
1443 | DBG(KERN_INFO "%s: tun_chr_close\n", dev->name); | |
1da177e4 | 1444 | |
631ab46b | 1445 | __tun_detach(tun); |
1da177e4 | 1446 | |
3ad2f3fb | 1447 | /* If desirable, unregister the netdevice. */ |
d23e4365 HX |
1448 | if (!(tun->flags & TUN_PERSIST)) { |
1449 | rtnl_lock(); | |
1450 | if (dev->reg_state == NETREG_REGISTERED) | |
1451 | unregister_netdevice(dev); | |
1452 | rtnl_unlock(); | |
1453 | } | |
631ab46b | 1454 | } |
1da177e4 | 1455 | |
9c3fea6a HX |
1456 | tun = tfile->tun; |
1457 | if (tun) | |
89f56d1e | 1458 | sock_put(tun->socket.sk); |
9c3fea6a | 1459 | |
36b50bab | 1460 | put_net(tfile->net); |
631ab46b | 1461 | kfree(tfile); |
1da177e4 LT |
1462 | |
1463 | return 0; | |
1464 | } | |
1465 | ||
d54b1fdb | 1466 | static const struct file_operations tun_fops = { |
6aa20a22 | 1467 | .owner = THIS_MODULE, |
1da177e4 | 1468 | .llseek = no_llseek, |
ee0b3e67 BP |
1469 | .read = do_sync_read, |
1470 | .aio_read = tun_chr_aio_read, | |
1471 | .write = do_sync_write, | |
1472 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 1473 | .poll = tun_chr_poll, |
50857e2a AB |
1474 | .unlocked_ioctl = tun_chr_ioctl, |
1475 | #ifdef CONFIG_COMPAT | |
1476 | .compat_ioctl = tun_chr_compat_ioctl, | |
1477 | #endif | |
1da177e4 LT |
1478 | .open = tun_chr_open, |
1479 | .release = tun_chr_close, | |
6aa20a22 | 1480 | .fasync = tun_chr_fasync |
1da177e4 LT |
1481 | }; |
1482 | ||
1483 | static struct miscdevice tun_miscdev = { | |
1484 | .minor = TUN_MINOR, | |
1485 | .name = "tun", | |
e454cea2 | 1486 | .nodename = "net/tun", |
1da177e4 | 1487 | .fops = &tun_fops, |
1da177e4 LT |
1488 | }; |
1489 | ||
1490 | /* ethtool interface */ | |
1491 | ||
1492 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1493 | { | |
1494 | cmd->supported = 0; | |
1495 | cmd->advertising = 0; | |
1496 | cmd->speed = SPEED_10; | |
1497 | cmd->duplex = DUPLEX_FULL; | |
1498 | cmd->port = PORT_TP; | |
1499 | cmd->phy_address = 0; | |
1500 | cmd->transceiver = XCVR_INTERNAL; | |
1501 | cmd->autoneg = AUTONEG_DISABLE; | |
1502 | cmd->maxtxpkt = 0; | |
1503 | cmd->maxrxpkt = 0; | |
1504 | return 0; | |
1505 | } | |
1506 | ||
1507 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
1508 | { | |
1509 | struct tun_struct *tun = netdev_priv(dev); | |
1510 | ||
1511 | strcpy(info->driver, DRV_NAME); | |
1512 | strcpy(info->version, DRV_VERSION); | |
1513 | strcpy(info->fw_version, "N/A"); | |
1514 | ||
1515 | switch (tun->flags & TUN_TYPE_MASK) { | |
1516 | case TUN_TUN_DEV: | |
1517 | strcpy(info->bus_info, "tun"); | |
1518 | break; | |
1519 | case TUN_TAP_DEV: | |
1520 | strcpy(info->bus_info, "tap"); | |
1521 | break; | |
1522 | } | |
1523 | } | |
1524 | ||
1525 | static u32 tun_get_msglevel(struct net_device *dev) | |
1526 | { | |
1527 | #ifdef TUN_DEBUG | |
1528 | struct tun_struct *tun = netdev_priv(dev); | |
1529 | return tun->debug; | |
1530 | #else | |
1531 | return -EOPNOTSUPP; | |
1532 | #endif | |
1533 | } | |
1534 | ||
1535 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
1536 | { | |
1537 | #ifdef TUN_DEBUG | |
1538 | struct tun_struct *tun = netdev_priv(dev); | |
1539 | tun->debug = value; | |
1540 | #endif | |
1541 | } | |
1542 | ||
1543 | static u32 tun_get_link(struct net_device *dev) | |
1544 | { | |
1545 | struct tun_struct *tun = netdev_priv(dev); | |
631ab46b | 1546 | return !!tun->tfile; |
1da177e4 LT |
1547 | } |
1548 | ||
1549 | static u32 tun_get_rx_csum(struct net_device *dev) | |
1550 | { | |
1551 | struct tun_struct *tun = netdev_priv(dev); | |
1552 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
1553 | } | |
1554 | ||
1555 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
1556 | { | |
1557 | struct tun_struct *tun = netdev_priv(dev); | |
1558 | if (data) | |
1559 | tun->flags &= ~TUN_NOCHECKSUM; | |
1560 | else | |
1561 | tun->flags |= TUN_NOCHECKSUM; | |
1562 | return 0; | |
1563 | } | |
1564 | ||
7282d491 | 1565 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
1566 | .get_settings = tun_get_settings, |
1567 | .get_drvinfo = tun_get_drvinfo, | |
1568 | .get_msglevel = tun_get_msglevel, | |
1569 | .set_msglevel = tun_set_msglevel, | |
1570 | .get_link = tun_get_link, | |
1571 | .get_rx_csum = tun_get_rx_csum, | |
1572 | .set_rx_csum = tun_set_rx_csum | |
1573 | }; | |
1574 | ||
79d17604 | 1575 | |
1da177e4 LT |
1576 | static int __init tun_init(void) |
1577 | { | |
1578 | int ret = 0; | |
1579 | ||
1580 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
1581 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
1582 | ||
f019a7a5 | 1583 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 1584 | if (ret) { |
f019a7a5 EB |
1585 | printk(KERN_ERR "tun: Can't register link_ops\n"); |
1586 | goto err_linkops; | |
79d17604 PE |
1587 | } |
1588 | ||
1da177e4 | 1589 | ret = misc_register(&tun_miscdev); |
79d17604 | 1590 | if (ret) { |
1da177e4 | 1591 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
1592 | goto err_misc; |
1593 | } | |
f019a7a5 | 1594 | return 0; |
79d17604 | 1595 | err_misc: |
f019a7a5 EB |
1596 | rtnl_link_unregister(&tun_link_ops); |
1597 | err_linkops: | |
1da177e4 LT |
1598 | return ret; |
1599 | } | |
1600 | ||
1601 | static void tun_cleanup(void) | |
1602 | { | |
6aa20a22 | 1603 | misc_deregister(&tun_miscdev); |
f019a7a5 | 1604 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
1605 | } |
1606 | ||
05c2828c MT |
1607 | /* Get an underlying socket object from tun file. Returns error unless file is |
1608 | * attached to a device. The returned object works like a packet socket, it | |
1609 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
1610 | * holding a reference to the file for as long as the socket is in use. */ | |
1611 | struct socket *tun_get_socket(struct file *file) | |
1612 | { | |
1613 | struct tun_struct *tun; | |
1614 | if (file->f_op != &tun_fops) | |
1615 | return ERR_PTR(-EINVAL); | |
1616 | tun = tun_get(file); | |
1617 | if (!tun) | |
1618 | return ERR_PTR(-EBADFD); | |
1619 | tun_put(tun); | |
1620 | return &tun->socket; | |
1621 | } | |
1622 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
1623 | ||
1da177e4 LT |
1624 | module_init(tun_init); |
1625 | module_exit(tun_cleanup); | |
1626 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1627 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1628 | MODULE_LICENSE("GPL"); | |
1629 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |