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Commit | Line | Data |
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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> | |
fd3e05b6 | 47 | #include <linux/smp_lock.h> |
1da177e4 LT |
48 | #include <linux/poll.h> |
49 | #include <linux/fcntl.h> | |
50 | #include <linux/init.h> | |
51 | #include <linux/skbuff.h> | |
52 | #include <linux/netdevice.h> | |
53 | #include <linux/etherdevice.h> | |
54 | #include <linux/miscdevice.h> | |
55 | #include <linux/ethtool.h> | |
56 | #include <linux/rtnetlink.h> | |
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> |
881d966b | 64 | #include <net/net_namespace.h> |
79d17604 | 65 | #include <net/netns/generic.h> |
f019a7a5 | 66 | #include <net/rtnetlink.h> |
33dccbb0 | 67 | #include <net/sock.h> |
1da177e4 LT |
68 | |
69 | #include <asm/system.h> | |
70 | #include <asm/uaccess.h> | |
71 | ||
14daa021 RR |
72 | /* Uncomment to enable debugging */ |
73 | /* #define TUN_DEBUG 1 */ | |
74 | ||
1da177e4 LT |
75 | #ifdef TUN_DEBUG |
76 | static int debug; | |
14daa021 RR |
77 | |
78 | #define DBG if(tun->debug)printk | |
79 | #define DBG1 if(debug==2)printk | |
80 | #else | |
81 | #define DBG( a... ) | |
82 | #define DBG1( a... ) | |
83 | #endif | |
84 | ||
f271b2cc MK |
85 | #define FLT_EXACT_COUNT 8 |
86 | struct tap_filter { | |
87 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
88 | u32 mask[2]; /* Mask of the hashed addrs */ | |
89 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
90 | }; | |
91 | ||
631ab46b | 92 | struct tun_file { |
c70f1829 | 93 | atomic_t count; |
631ab46b | 94 | struct tun_struct *tun; |
36b50bab | 95 | struct net *net; |
b2430de3 | 96 | wait_queue_head_t read_wait; |
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 RR |
107 | struct sk_buff_head readq; |
108 | ||
109 | struct net_device *dev; | |
f271b2cc | 110 | struct fasync_struct *fasync; |
14daa021 | 111 | |
f271b2cc | 112 | struct tap_filter txflt; |
33dccbb0 HX |
113 | struct sock *sk; |
114 | struct socket socket; | |
14daa021 RR |
115 | |
116 | #ifdef TUN_DEBUG | |
117 | int debug; | |
1da177e4 | 118 | #endif |
14daa021 | 119 | }; |
1da177e4 | 120 | |
33dccbb0 HX |
121 | struct tun_sock { |
122 | struct sock sk; | |
123 | struct tun_struct *tun; | |
124 | }; | |
125 | ||
126 | static inline struct tun_sock *tun_sk(struct sock *sk) | |
127 | { | |
128 | return container_of(sk, struct tun_sock, sk); | |
129 | } | |
130 | ||
a7385ba2 EB |
131 | static int tun_attach(struct tun_struct *tun, struct file *file) |
132 | { | |
631ab46b | 133 | struct tun_file *tfile = file->private_data; |
a7385ba2 | 134 | const struct cred *cred = current_cred(); |
38231b7a | 135 | int err; |
a7385ba2 EB |
136 | |
137 | ASSERT_RTNL(); | |
138 | ||
a7385ba2 EB |
139 | /* Check permissions */ |
140 | if (((tun->owner != -1 && cred->euid != tun->owner) || | |
1bded710 | 141 | (tun->group != -1 && !in_egroup_p(tun->group))) && |
a7385ba2 EB |
142 | !capable(CAP_NET_ADMIN)) |
143 | return -EPERM; | |
144 | ||
38231b7a EB |
145 | netif_tx_lock_bh(tun->dev); |
146 | ||
147 | err = -EINVAL; | |
148 | if (tfile->tun) | |
149 | goto out; | |
150 | ||
151 | err = -EBUSY; | |
152 | if (tun->tfile) | |
153 | goto out; | |
154 | ||
155 | err = 0; | |
631ab46b EB |
156 | tfile->tun = tun; |
157 | tun->tfile = tfile; | |
c70f1829 EB |
158 | dev_hold(tun->dev); |
159 | atomic_inc(&tfile->count); | |
a7385ba2 | 160 | |
38231b7a EB |
161 | out: |
162 | netif_tx_unlock_bh(tun->dev); | |
163 | return err; | |
a7385ba2 EB |
164 | } |
165 | ||
631ab46b EB |
166 | static void __tun_detach(struct tun_struct *tun) |
167 | { | |
168 | struct tun_file *tfile = tun->tfile; | |
169 | ||
170 | /* Detach from net device */ | |
38231b7a | 171 | netif_tx_lock_bh(tun->dev); |
631ab46b EB |
172 | tfile->tun = NULL; |
173 | tun->tfile = NULL; | |
38231b7a | 174 | netif_tx_unlock_bh(tun->dev); |
631ab46b EB |
175 | |
176 | /* Drop read queue */ | |
177 | skb_queue_purge(&tun->readq); | |
c70f1829 EB |
178 | |
179 | /* Drop the extra count on the net device */ | |
180 | dev_put(tun->dev); | |
181 | } | |
182 | ||
183 | static void tun_detach(struct tun_struct *tun) | |
184 | { | |
185 | rtnl_lock(); | |
186 | __tun_detach(tun); | |
187 | rtnl_unlock(); | |
631ab46b EB |
188 | } |
189 | ||
190 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
191 | { | |
c70f1829 EB |
192 | struct tun_struct *tun = NULL; |
193 | ||
194 | if (atomic_inc_not_zero(&tfile->count)) | |
195 | tun = tfile->tun; | |
196 | ||
197 | return tun; | |
631ab46b EB |
198 | } |
199 | ||
200 | static struct tun_struct *tun_get(struct file *file) | |
201 | { | |
202 | return __tun_get(file->private_data); | |
203 | } | |
204 | ||
205 | static void tun_put(struct tun_struct *tun) | |
206 | { | |
c70f1829 EB |
207 | struct tun_file *tfile = tun->tfile; |
208 | ||
209 | if (atomic_dec_and_test(&tfile->count)) | |
210 | tun_detach(tfile->tun); | |
631ab46b EB |
211 | } |
212 | ||
f271b2cc MK |
213 | /* TAP filterting */ |
214 | static void addr_hash_set(u32 *mask, const u8 *addr) | |
215 | { | |
216 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
217 | mask[n >> 5] |= (1 << (n & 31)); | |
218 | } | |
219 | ||
220 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
221 | { | |
222 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
223 | return mask[n >> 5] & (1 << (n & 31)); | |
224 | } | |
225 | ||
226 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
227 | { | |
228 | struct { u8 u[ETH_ALEN]; } *addr; | |
229 | struct tun_filter uf; | |
230 | int err, alen, n, nexact; | |
231 | ||
232 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
233 | return -EFAULT; | |
234 | ||
235 | if (!uf.count) { | |
236 | /* Disabled */ | |
237 | filter->count = 0; | |
238 | return 0; | |
239 | } | |
240 | ||
241 | alen = ETH_ALEN * uf.count; | |
242 | addr = kmalloc(alen, GFP_KERNEL); | |
243 | if (!addr) | |
244 | return -ENOMEM; | |
245 | ||
246 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
247 | err = -EFAULT; | |
248 | goto done; | |
249 | } | |
250 | ||
251 | /* The filter is updated without holding any locks. Which is | |
252 | * perfectly safe. We disable it first and in the worst | |
253 | * case we'll accept a few undesired packets. */ | |
254 | filter->count = 0; | |
255 | wmb(); | |
256 | ||
257 | /* Use first set of addresses as an exact filter */ | |
258 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
259 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
260 | ||
261 | nexact = n; | |
262 | ||
cfbf84fc AW |
263 | /* Remaining multicast addresses are hashed, |
264 | * unicast will leave the filter disabled. */ | |
f271b2cc | 265 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
266 | for (; n < uf.count; n++) { |
267 | if (!is_multicast_ether_addr(addr[n].u)) { | |
268 | err = 0; /* no filter */ | |
269 | goto done; | |
270 | } | |
f271b2cc | 271 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 272 | } |
f271b2cc MK |
273 | |
274 | /* For ALLMULTI just set the mask to all ones. | |
275 | * This overrides the mask populated above. */ | |
276 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
277 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
278 | ||
279 | /* Now enable the filter */ | |
280 | wmb(); | |
281 | filter->count = nexact; | |
282 | ||
283 | /* Return the number of exact filters */ | |
284 | err = nexact; | |
285 | ||
286 | done: | |
287 | kfree(addr); | |
288 | return err; | |
289 | } | |
290 | ||
291 | /* Returns: 0 - drop, !=0 - accept */ | |
292 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
293 | { | |
294 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
295 | * at this point. */ | |
296 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
297 | int i; | |
298 | ||
299 | /* Exact match */ | |
300 | for (i = 0; i < filter->count; i++) | |
301 | if (!compare_ether_addr(eh->h_dest, filter->addr[i])) | |
302 | return 1; | |
303 | ||
304 | /* Inexact match (multicast only) */ | |
305 | if (is_multicast_ether_addr(eh->h_dest)) | |
306 | return addr_hash_test(filter->mask, eh->h_dest); | |
307 | ||
308 | return 0; | |
309 | } | |
310 | ||
311 | /* | |
312 | * Checks whether the packet is accepted or not. | |
313 | * Returns: 0 - drop, !=0 - accept | |
314 | */ | |
315 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
316 | { | |
317 | if (!filter->count) | |
318 | return 1; | |
319 | ||
320 | return run_filter(filter, skb); | |
321 | } | |
322 | ||
1da177e4 LT |
323 | /* Network device part of the driver */ |
324 | ||
7282d491 | 325 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 326 | |
c70f1829 EB |
327 | /* Net device detach from fd. */ |
328 | static void tun_net_uninit(struct net_device *dev) | |
329 | { | |
330 | struct tun_struct *tun = netdev_priv(dev); | |
331 | struct tun_file *tfile = tun->tfile; | |
332 | ||
333 | /* Inform the methods they need to stop using the dev. | |
334 | */ | |
335 | if (tfile) { | |
336 | wake_up_all(&tfile->read_wait); | |
337 | if (atomic_dec_and_test(&tfile->count)) | |
338 | __tun_detach(tun); | |
339 | } | |
340 | } | |
341 | ||
1da177e4 LT |
342 | /* Net device open. */ |
343 | static int tun_net_open(struct net_device *dev) | |
344 | { | |
345 | netif_start_queue(dev); | |
346 | return 0; | |
347 | } | |
348 | ||
349 | /* Net device close. */ | |
350 | static int tun_net_close(struct net_device *dev) | |
351 | { | |
352 | netif_stop_queue(dev); | |
353 | return 0; | |
354 | } | |
355 | ||
356 | /* Net device start xmit */ | |
357 | static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
358 | { | |
359 | struct tun_struct *tun = netdev_priv(dev); | |
360 | ||
361 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); | |
362 | ||
363 | /* Drop packet if interface is not attached */ | |
631ab46b | 364 | if (!tun->tfile) |
1da177e4 LT |
365 | goto drop; |
366 | ||
f271b2cc MK |
367 | /* Drop if the filter does not like it. |
368 | * This is a noop if the filter is disabled. | |
369 | * Filter can be enabled only for the TAP devices. */ | |
370 | if (!check_filter(&tun->txflt, skb)) | |
371 | goto drop; | |
372 | ||
1da177e4 LT |
373 | if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { |
374 | if (!(tun->flags & TUN_ONE_QUEUE)) { | |
375 | /* Normal queueing mode. */ | |
376 | /* Packet scheduler handles dropping of further packets. */ | |
377 | netif_stop_queue(dev); | |
378 | ||
379 | /* We won't see all dropped packets individually, so overrun | |
380 | * error is more appropriate. */ | |
09f75cd7 | 381 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
382 | } else { |
383 | /* Single queue mode. | |
384 | * Driver handles dropping of all packets itself. */ | |
385 | goto drop; | |
386 | } | |
387 | } | |
388 | ||
f271b2cc | 389 | /* Enqueue packet */ |
1da177e4 LT |
390 | skb_queue_tail(&tun->readq, skb); |
391 | dev->trans_start = jiffies; | |
392 | ||
393 | /* Notify and wake up reader process */ | |
394 | if (tun->flags & TUN_FASYNC) | |
395 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
b2430de3 | 396 | wake_up_interruptible(&tun->tfile->read_wait); |
1da177e4 LT |
397 | return 0; |
398 | ||
399 | drop: | |
09f75cd7 | 400 | dev->stats.tx_dropped++; |
1da177e4 LT |
401 | kfree_skb(skb); |
402 | return 0; | |
403 | } | |
404 | ||
f271b2cc | 405 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 406 | { |
f271b2cc MK |
407 | /* |
408 | * This callback is supposed to deal with mc filter in | |
409 | * _rx_ path and has nothing to do with the _tx_ path. | |
410 | * In rx path we always accept everything userspace gives us. | |
411 | */ | |
412 | return; | |
1da177e4 LT |
413 | } |
414 | ||
4885a504 ES |
415 | #define MIN_MTU 68 |
416 | #define MAX_MTU 65535 | |
417 | ||
418 | static int | |
419 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
420 | { | |
421 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
422 | return -EINVAL; | |
423 | dev->mtu = new_mtu; | |
424 | return 0; | |
425 | } | |
426 | ||
758e43b7 | 427 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 428 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
429 | .ndo_open = tun_net_open, |
430 | .ndo_stop = tun_net_close, | |
00829823 | 431 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 432 | .ndo_change_mtu = tun_net_change_mtu, |
758e43b7 SH |
433 | }; |
434 | ||
435 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 436 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
437 | .ndo_open = tun_net_open, |
438 | .ndo_stop = tun_net_close, | |
00829823 | 439 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 SH |
440 | .ndo_change_mtu = tun_net_change_mtu, |
441 | .ndo_set_multicast_list = tun_net_mclist, | |
442 | .ndo_set_mac_address = eth_mac_addr, | |
443 | .ndo_validate_addr = eth_validate_addr, | |
444 | }; | |
445 | ||
1da177e4 LT |
446 | /* Initialize net device. */ |
447 | static void tun_net_init(struct net_device *dev) | |
448 | { | |
449 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 450 | |
1da177e4 LT |
451 | switch (tun->flags & TUN_TYPE_MASK) { |
452 | case TUN_TUN_DEV: | |
758e43b7 SH |
453 | dev->netdev_ops = &tun_netdev_ops; |
454 | ||
1da177e4 LT |
455 | /* Point-to-Point TUN Device */ |
456 | dev->hard_header_len = 0; | |
457 | dev->addr_len = 0; | |
458 | dev->mtu = 1500; | |
459 | ||
460 | /* Zero header length */ | |
6aa20a22 | 461 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
462 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
463 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
464 | break; | |
465 | ||
466 | case TUN_TAP_DEV: | |
7a0a9608 | 467 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 468 | /* Ethernet TAP Device */ |
1da177e4 | 469 | ether_setup(dev); |
36226a8d | 470 | |
f271b2cc | 471 | random_ether_addr(dev->dev_addr); |
36226a8d | 472 | |
1da177e4 LT |
473 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
474 | break; | |
475 | } | |
476 | } | |
477 | ||
478 | /* Character device part */ | |
479 | ||
480 | /* Poll */ | |
481 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 482 | { |
b2430de3 EB |
483 | struct tun_file *tfile = file->private_data; |
484 | struct tun_struct *tun = __tun_get(tfile); | |
33dccbb0 HX |
485 | struct sock *sk = tun->sk; |
486 | unsigned int mask = 0; | |
1da177e4 LT |
487 | |
488 | if (!tun) | |
eac9e902 | 489 | return POLLERR; |
1da177e4 LT |
490 | |
491 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); | |
492 | ||
b2430de3 | 493 | poll_wait(file, &tfile->read_wait, wait); |
6aa20a22 | 494 | |
b03efcfb | 495 | if (!skb_queue_empty(&tun->readq)) |
1da177e4 LT |
496 | mask |= POLLIN | POLLRDNORM; |
497 | ||
33dccbb0 HX |
498 | if (sock_writeable(sk) || |
499 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
500 | sock_writeable(sk))) | |
501 | mask |= POLLOUT | POLLWRNORM; | |
502 | ||
c70f1829 EB |
503 | if (tun->dev->reg_state != NETREG_REGISTERED) |
504 | mask = POLLERR; | |
505 | ||
631ab46b | 506 | tun_put(tun); |
1da177e4 LT |
507 | return mask; |
508 | } | |
509 | ||
f42157cb RR |
510 | /* prepad is the amount to reserve at front. len is length after that. |
511 | * linear is a hint as to how much to copy (usually headers). */ | |
33dccbb0 HX |
512 | static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun, |
513 | size_t prepad, size_t len, | |
514 | size_t linear, int noblock) | |
f42157cb | 515 | { |
33dccbb0 | 516 | struct sock *sk = tun->sk; |
f42157cb | 517 | struct sk_buff *skb; |
33dccbb0 | 518 | int err; |
f42157cb RR |
519 | |
520 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 521 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 522 | linear = len; |
f42157cb | 523 | |
33dccbb0 HX |
524 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
525 | &err); | |
f42157cb | 526 | if (!skb) |
33dccbb0 | 527 | return ERR_PTR(err); |
f42157cb RR |
528 | |
529 | skb_reserve(skb, prepad); | |
530 | skb_put(skb, linear); | |
33dccbb0 HX |
531 | skb->data_len = len - linear; |
532 | skb->len += len - linear; | |
f42157cb RR |
533 | |
534 | return skb; | |
535 | } | |
536 | ||
1da177e4 | 537 | /* Get packet from user space buffer */ |
33dccbb0 HX |
538 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, |
539 | struct iovec *iv, size_t count, | |
540 | int noblock) | |
1da177e4 | 541 | { |
09640e63 | 542 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 LT |
543 | struct sk_buff *skb; |
544 | size_t len = count, align = 0; | |
f43798c2 | 545 | struct virtio_net_hdr gso = { 0 }; |
1da177e4 LT |
546 | |
547 | if (!(tun->flags & TUN_NO_PI)) { | |
548 | if ((len -= sizeof(pi)) > count) | |
549 | return -EINVAL; | |
550 | ||
551 | if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) | |
552 | return -EFAULT; | |
553 | } | |
554 | ||
f43798c2 RR |
555 | if (tun->flags & TUN_VNET_HDR) { |
556 | if ((len -= sizeof(gso)) > count) | |
557 | return -EINVAL; | |
558 | ||
559 | if (memcpy_fromiovec((void *)&gso, iv, sizeof(gso))) | |
560 | return -EFAULT; | |
561 | ||
562 | if (gso.hdr_len > len) | |
563 | return -EINVAL; | |
564 | } | |
565 | ||
e01bf1c8 | 566 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
1da177e4 | 567 | align = NET_IP_ALIGN; |
0eca93bc HX |
568 | if (unlikely(len < ETH_HLEN || |
569 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
570 | return -EINVAL; |
571 | } | |
6aa20a22 | 572 | |
33dccbb0 HX |
573 | skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock); |
574 | if (IS_ERR(skb)) { | |
575 | if (PTR_ERR(skb) != -EAGAIN) | |
576 | tun->dev->stats.rx_dropped++; | |
577 | return PTR_ERR(skb); | |
1da177e4 LT |
578 | } |
579 | ||
f42157cb | 580 | if (skb_copy_datagram_from_iovec(skb, 0, iv, len)) { |
09f75cd7 | 581 | tun->dev->stats.rx_dropped++; |
8f22757e | 582 | kfree_skb(skb); |
1da177e4 | 583 | return -EFAULT; |
8f22757e | 584 | } |
1da177e4 | 585 | |
f43798c2 RR |
586 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
587 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
588 | gso.csum_offset)) { | |
589 | tun->dev->stats.rx_frame_errors++; | |
590 | kfree_skb(skb); | |
591 | return -EINVAL; | |
592 | } | |
593 | } else if (tun->flags & TUN_NOCHECKSUM) | |
594 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
595 | ||
1da177e4 LT |
596 | switch (tun->flags & TUN_TYPE_MASK) { |
597 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
598 | if (tun->flags & TUN_NO_PI) { |
599 | switch (skb->data[0] & 0xf0) { | |
600 | case 0x40: | |
601 | pi.proto = htons(ETH_P_IP); | |
602 | break; | |
603 | case 0x60: | |
604 | pi.proto = htons(ETH_P_IPV6); | |
605 | break; | |
606 | default: | |
607 | tun->dev->stats.rx_dropped++; | |
608 | kfree_skb(skb); | |
609 | return -EINVAL; | |
610 | } | |
611 | } | |
612 | ||
459a98ed | 613 | skb_reset_mac_header(skb); |
1da177e4 | 614 | skb->protocol = pi.proto; |
4c13eb66 | 615 | skb->dev = tun->dev; |
1da177e4 LT |
616 | break; |
617 | case TUN_TAP_DEV: | |
618 | skb->protocol = eth_type_trans(skb, tun->dev); | |
619 | break; | |
620 | }; | |
621 | ||
f43798c2 RR |
622 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
623 | pr_debug("GSO!\n"); | |
624 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
625 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
626 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
627 | break; | |
628 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
629 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
630 | break; | |
631 | default: | |
632 | tun->dev->stats.rx_frame_errors++; | |
633 | kfree_skb(skb); | |
634 | return -EINVAL; | |
635 | } | |
636 | ||
637 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
638 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
639 | ||
640 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
641 | if (skb_shinfo(skb)->gso_size == 0) { | |
642 | tun->dev->stats.rx_frame_errors++; | |
643 | kfree_skb(skb); | |
644 | return -EINVAL; | |
645 | } | |
646 | ||
647 | /* Header must be checked, and gso_segs computed. */ | |
648 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
649 | skb_shinfo(skb)->gso_segs = 0; | |
650 | } | |
6aa20a22 | 651 | |
1da177e4 | 652 | netif_rx_ni(skb); |
6aa20a22 | 653 | |
09f75cd7 JG |
654 | tun->dev->stats.rx_packets++; |
655 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
656 | |
657 | return count; | |
6aa20a22 | 658 | } |
1da177e4 | 659 | |
ee0b3e67 BP |
660 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
661 | unsigned long count, loff_t pos) | |
1da177e4 | 662 | { |
33dccbb0 | 663 | struct file *file = iocb->ki_filp; |
ab46d779 | 664 | struct tun_struct *tun = tun_get(file); |
631ab46b | 665 | ssize_t result; |
1da177e4 LT |
666 | |
667 | if (!tun) | |
668 | return -EBADFD; | |
669 | ||
670 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
671 | ||
33dccbb0 HX |
672 | result = tun_get_user(tun, (struct iovec *)iv, iov_length(iv, count), |
673 | file->f_flags & O_NONBLOCK); | |
631ab46b EB |
674 | |
675 | tun_put(tun); | |
676 | return result; | |
1da177e4 LT |
677 | } |
678 | ||
1da177e4 LT |
679 | /* Put packet to the user space buffer */ |
680 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
681 | struct sk_buff *skb, | |
682 | struct iovec *iv, int len) | |
683 | { | |
684 | struct tun_pi pi = { 0, skb->protocol }; | |
685 | ssize_t total = 0; | |
686 | ||
687 | if (!(tun->flags & TUN_NO_PI)) { | |
688 | if ((len -= sizeof(pi)) < 0) | |
689 | return -EINVAL; | |
690 | ||
691 | if (len < skb->len) { | |
692 | /* Packet will be striped */ | |
693 | pi.flags |= TUN_PKT_STRIP; | |
694 | } | |
6aa20a22 | 695 | |
1da177e4 LT |
696 | if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) |
697 | return -EFAULT; | |
698 | total += sizeof(pi); | |
6aa20a22 | 699 | } |
1da177e4 | 700 | |
f43798c2 RR |
701 | if (tun->flags & TUN_VNET_HDR) { |
702 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
703 | if ((len -= sizeof(gso)) < 0) | |
704 | return -EINVAL; | |
705 | ||
706 | if (skb_is_gso(skb)) { | |
707 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
708 | ||
709 | /* This is a hint as to how much should be linear. */ | |
710 | gso.hdr_len = skb_headlen(skb); | |
711 | gso.gso_size = sinfo->gso_size; | |
712 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
713 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
714 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
715 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
716 | else | |
717 | BUG(); | |
718 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
719 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
720 | } else | |
721 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
722 | ||
723 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
724 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
725 | gso.csum_start = skb->csum_start - skb_headroom(skb); | |
726 | gso.csum_offset = skb->csum_offset; | |
727 | } /* else everything is zero */ | |
728 | ||
729 | if (unlikely(memcpy_toiovec(iv, (void *)&gso, sizeof(gso)))) | |
730 | return -EFAULT; | |
731 | total += sizeof(gso); | |
732 | } | |
733 | ||
1da177e4 LT |
734 | len = min_t(int, skb->len, len); |
735 | ||
736 | skb_copy_datagram_iovec(skb, 0, iv, len); | |
737 | total += len; | |
738 | ||
09f75cd7 JG |
739 | tun->dev->stats.tx_packets++; |
740 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
741 | |
742 | return total; | |
743 | } | |
744 | ||
ee0b3e67 BP |
745 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
746 | unsigned long count, loff_t pos) | |
1da177e4 | 747 | { |
ee0b3e67 | 748 | struct file *file = iocb->ki_filp; |
b2430de3 EB |
749 | struct tun_file *tfile = file->private_data; |
750 | struct tun_struct *tun = __tun_get(tfile); | |
1da177e4 LT |
751 | DECLARE_WAITQUEUE(wait, current); |
752 | struct sk_buff *skb; | |
753 | ssize_t len, ret = 0; | |
754 | ||
755 | if (!tun) | |
756 | return -EBADFD; | |
757 | ||
758 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
759 | ||
52427c9d | 760 | len = iov_length(iv, count); |
631ab46b EB |
761 | if (len < 0) { |
762 | ret = -EINVAL; | |
763 | goto out; | |
764 | } | |
1da177e4 | 765 | |
b2430de3 | 766 | add_wait_queue(&tfile->read_wait, &wait); |
1da177e4 | 767 | while (len) { |
1da177e4 LT |
768 | current->state = TASK_INTERRUPTIBLE; |
769 | ||
770 | /* Read frames from the queue */ | |
771 | if (!(skb=skb_dequeue(&tun->readq))) { | |
772 | if (file->f_flags & O_NONBLOCK) { | |
773 | ret = -EAGAIN; | |
774 | break; | |
775 | } | |
776 | if (signal_pending(current)) { | |
777 | ret = -ERESTARTSYS; | |
778 | break; | |
779 | } | |
c70f1829 EB |
780 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
781 | ret = -EIO; | |
782 | break; | |
783 | } | |
1da177e4 LT |
784 | |
785 | /* Nothing to read, let's sleep */ | |
786 | schedule(); | |
787 | continue; | |
788 | } | |
789 | netif_wake_queue(tun->dev); | |
790 | ||
f271b2cc MK |
791 | ret = tun_put_user(tun, skb, (struct iovec *) iv, len); |
792 | kfree_skb(skb); | |
793 | break; | |
1da177e4 LT |
794 | } |
795 | ||
796 | current->state = TASK_RUNNING; | |
b2430de3 | 797 | remove_wait_queue(&tfile->read_wait, &wait); |
1da177e4 | 798 | |
631ab46b EB |
799 | out: |
800 | tun_put(tun); | |
1da177e4 LT |
801 | return ret; |
802 | } | |
803 | ||
1da177e4 LT |
804 | static void tun_setup(struct net_device *dev) |
805 | { | |
806 | struct tun_struct *tun = netdev_priv(dev); | |
807 | ||
808 | skb_queue_head_init(&tun->readq); | |
1da177e4 LT |
809 | |
810 | tun->owner = -1; | |
8c644623 | 811 | tun->group = -1; |
1da177e4 | 812 | |
1da177e4 LT |
813 | dev->ethtool_ops = &tun_ethtool_ops; |
814 | dev->destructor = free_netdev; | |
815 | } | |
816 | ||
f019a7a5 EB |
817 | /* Trivial set of netlink ops to allow deleting tun or tap |
818 | * device with netlink. | |
819 | */ | |
820 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
821 | { | |
822 | return -EINVAL; | |
823 | } | |
824 | ||
825 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
826 | .kind = DRV_NAME, | |
827 | .priv_size = sizeof(struct tun_struct), | |
828 | .setup = tun_setup, | |
829 | .validate = tun_validate, | |
830 | }; | |
831 | ||
33dccbb0 HX |
832 | static void tun_sock_write_space(struct sock *sk) |
833 | { | |
834 | struct tun_struct *tun; | |
835 | ||
836 | if (!sock_writeable(sk)) | |
837 | return; | |
838 | ||
839 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
840 | wake_up_interruptible_sync(sk->sk_sleep); | |
841 | ||
842 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) | |
843 | return; | |
844 | ||
845 | tun = container_of(sk, struct tun_sock, sk)->tun; | |
846 | kill_fasync(&tun->fasync, SIGIO, POLL_OUT); | |
847 | } | |
848 | ||
849 | static void tun_sock_destruct(struct sock *sk) | |
850 | { | |
851 | dev_put(container_of(sk, struct tun_sock, sk)->tun->dev); | |
852 | } | |
853 | ||
854 | static struct proto tun_proto = { | |
855 | .name = "tun", | |
856 | .owner = THIS_MODULE, | |
857 | .obj_size = sizeof(struct tun_sock), | |
858 | }; | |
f019a7a5 | 859 | |
d647a591 | 860 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 | 861 | { |
33dccbb0 | 862 | struct sock *sk; |
1da177e4 LT |
863 | struct tun_struct *tun; |
864 | struct net_device *dev; | |
33dccbb0 | 865 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
866 | int err; |
867 | ||
74a3e5a7 EB |
868 | dev = __dev_get_by_name(net, ifr->ifr_name); |
869 | if (dev) { | |
870 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) | |
871 | tun = netdev_priv(dev); | |
872 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
873 | tun = netdev_priv(dev); | |
874 | else | |
875 | return -EINVAL; | |
876 | ||
a7385ba2 EB |
877 | err = tun_attach(tun, file); |
878 | if (err < 0) | |
879 | return err; | |
6aa20a22 | 880 | } |
1da177e4 LT |
881 | else { |
882 | char *name; | |
883 | unsigned long flags = 0; | |
884 | ||
885 | err = -EINVAL; | |
886 | ||
ca6bb5d7 DW |
887 | if (!capable(CAP_NET_ADMIN)) |
888 | return -EPERM; | |
889 | ||
1da177e4 LT |
890 | /* Set dev type */ |
891 | if (ifr->ifr_flags & IFF_TUN) { | |
892 | /* TUN device */ | |
893 | flags |= TUN_TUN_DEV; | |
894 | name = "tun%d"; | |
895 | } else if (ifr->ifr_flags & IFF_TAP) { | |
896 | /* TAP device */ | |
897 | flags |= TUN_TAP_DEV; | |
898 | name = "tap%d"; | |
6aa20a22 | 899 | } else |
1da177e4 | 900 | goto failed; |
6aa20a22 | 901 | |
1da177e4 LT |
902 | if (*ifr->ifr_name) |
903 | name = ifr->ifr_name; | |
904 | ||
905 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
906 | tun_setup); | |
907 | if (!dev) | |
908 | return -ENOMEM; | |
909 | ||
fc54c658 | 910 | dev_net_set(dev, net); |
f019a7a5 | 911 | dev->rtnl_link_ops = &tun_link_ops; |
758e43b7 | 912 | |
1da177e4 LT |
913 | tun = netdev_priv(dev); |
914 | tun->dev = dev; | |
915 | tun->flags = flags; | |
f271b2cc | 916 | tun->txflt.count = 0; |
1da177e4 | 917 | |
33dccbb0 HX |
918 | err = -ENOMEM; |
919 | sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto); | |
920 | if (!sk) | |
921 | goto err_free_dev; | |
922 | ||
923 | /* This ref count is for tun->sk. */ | |
924 | dev_hold(dev); | |
925 | sock_init_data(&tun->socket, sk); | |
926 | sk->sk_write_space = tun_sock_write_space; | |
927 | sk->sk_destruct = tun_sock_destruct; | |
928 | sk->sk_sndbuf = INT_MAX; | |
929 | sk->sk_sleep = &tfile->read_wait; | |
930 | ||
931 | tun->sk = sk; | |
932 | container_of(sk, struct tun_sock, sk)->tun = tun; | |
933 | ||
1da177e4 LT |
934 | tun_net_init(dev); |
935 | ||
936 | if (strchr(dev->name, '%')) { | |
937 | err = dev_alloc_name(dev, dev->name); | |
938 | if (err < 0) | |
33dccbb0 | 939 | goto err_free_sk; |
1da177e4 LT |
940 | } |
941 | ||
33dccbb0 | 942 | err = -EINVAL; |
1da177e4 LT |
943 | err = register_netdevice(tun->dev); |
944 | if (err < 0) | |
945 | goto err_free_dev; | |
a7385ba2 EB |
946 | |
947 | err = tun_attach(tun, file); | |
948 | if (err < 0) | |
949 | goto err_free_dev; | |
1da177e4 LT |
950 | } |
951 | ||
952 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
953 | ||
954 | if (ifr->ifr_flags & IFF_NO_PI) | |
955 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
956 | else |
957 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
958 | |
959 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
960 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
961 | else |
962 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 963 | |
f43798c2 RR |
964 | if (ifr->ifr_flags & IFF_VNET_HDR) |
965 | tun->flags |= TUN_VNET_HDR; | |
966 | else | |
967 | tun->flags &= ~TUN_VNET_HDR; | |
968 | ||
e35259a9 MK |
969 | /* Make sure persistent devices do not get stuck in |
970 | * xoff state. | |
971 | */ | |
972 | if (netif_running(tun->dev)) | |
973 | netif_wake_queue(tun->dev); | |
974 | ||
1da177e4 LT |
975 | strcpy(ifr->ifr_name, tun->dev->name); |
976 | return 0; | |
977 | ||
33dccbb0 HX |
978 | err_free_sk: |
979 | sock_put(sk); | |
1da177e4 LT |
980 | err_free_dev: |
981 | free_netdev(dev); | |
982 | failed: | |
983 | return err; | |
984 | } | |
985 | ||
e3b99556 MM |
986 | static int tun_get_iff(struct net *net, struct file *file, struct ifreq *ifr) |
987 | { | |
631ab46b | 988 | struct tun_struct *tun = tun_get(file); |
e3b99556 MM |
989 | |
990 | if (!tun) | |
991 | return -EBADFD; | |
992 | ||
993 | DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name); | |
994 | ||
995 | strcpy(ifr->ifr_name, tun->dev->name); | |
996 | ||
997 | ifr->ifr_flags = 0; | |
998 | ||
999 | if (ifr->ifr_flags & TUN_TUN_DEV) | |
1000 | ifr->ifr_flags |= IFF_TUN; | |
1001 | else | |
1002 | ifr->ifr_flags |= IFF_TAP; | |
1003 | ||
1004 | if (tun->flags & TUN_NO_PI) | |
1005 | ifr->ifr_flags |= IFF_NO_PI; | |
1006 | ||
1007 | if (tun->flags & TUN_ONE_QUEUE) | |
1008 | ifr->ifr_flags |= IFF_ONE_QUEUE; | |
1009 | ||
1010 | if (tun->flags & TUN_VNET_HDR) | |
1011 | ifr->ifr_flags |= IFF_VNET_HDR; | |
1012 | ||
631ab46b | 1013 | tun_put(tun); |
e3b99556 MM |
1014 | return 0; |
1015 | } | |
1016 | ||
5228ddc9 RR |
1017 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1018 | * privs required. */ | |
1019 | static int set_offload(struct net_device *dev, unsigned long arg) | |
1020 | { | |
1021 | unsigned int old_features, features; | |
1022 | ||
1023 | old_features = dev->features; | |
1024 | /* Unset features, set them as we chew on the arg. */ | |
1025 | features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST | |
1026 | |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6)); | |
1027 | ||
1028 | if (arg & TUN_F_CSUM) { | |
1029 | features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1030 | arg &= ~TUN_F_CSUM; | |
1031 | ||
1032 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1033 | if (arg & TUN_F_TSO_ECN) { | |
1034 | features |= NETIF_F_TSO_ECN; | |
1035 | arg &= ~TUN_F_TSO_ECN; | |
1036 | } | |
1037 | if (arg & TUN_F_TSO4) | |
1038 | features |= NETIF_F_TSO; | |
1039 | if (arg & TUN_F_TSO6) | |
1040 | features |= NETIF_F_TSO6; | |
1041 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1042 | } | |
1043 | } | |
1044 | ||
1045 | /* This gives the user a way to test for new features in future by | |
1046 | * trying to set them. */ | |
1047 | if (arg) | |
1048 | return -EINVAL; | |
1049 | ||
1050 | dev->features = features; | |
1051 | if (old_features != dev->features) | |
1052 | netdev_features_change(dev); | |
1053 | ||
1054 | return 0; | |
1055 | } | |
1056 | ||
6aa20a22 | 1057 | static int tun_chr_ioctl(struct inode *inode, struct file *file, |
1da177e4 LT |
1058 | unsigned int cmd, unsigned long arg) |
1059 | { | |
36b50bab | 1060 | struct tun_file *tfile = file->private_data; |
631ab46b | 1061 | struct tun_struct *tun; |
1da177e4 LT |
1062 | void __user* argp = (void __user*)arg; |
1063 | struct ifreq ifr; | |
33dccbb0 | 1064 | int sndbuf; |
f271b2cc | 1065 | int ret; |
1da177e4 LT |
1066 | |
1067 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
1068 | if (copy_from_user(&ifr, argp, sizeof ifr)) | |
1069 | return -EFAULT; | |
1070 | ||
631ab46b EB |
1071 | if (cmd == TUNGETFEATURES) { |
1072 | /* Currently this just means: "what IFF flags are valid?". | |
1073 | * This is needed because we never checked for invalid flags on | |
1074 | * TUNSETIFF. */ | |
1075 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
1076 | IFF_VNET_HDR, | |
1077 | (unsigned int __user*)argp); | |
1078 | } | |
1079 | ||
36b50bab | 1080 | tun = __tun_get(tfile); |
1da177e4 LT |
1081 | if (cmd == TUNSETIFF && !tun) { |
1082 | int err; | |
1083 | ||
1084 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
1085 | ||
1086 | rtnl_lock(); | |
36b50bab | 1087 | err = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 LT |
1088 | rtnl_unlock(); |
1089 | ||
1090 | if (err) | |
1091 | return err; | |
1092 | ||
1093 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
1094 | return -EFAULT; | |
1095 | return 0; | |
1096 | } | |
1097 | ||
07240fd0 | 1098 | |
1da177e4 LT |
1099 | if (!tun) |
1100 | return -EBADFD; | |
1101 | ||
1102 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
1103 | ||
631ab46b | 1104 | ret = 0; |
1da177e4 | 1105 | switch (cmd) { |
e3b99556 MM |
1106 | case TUNGETIFF: |
1107 | ret = tun_get_iff(current->nsproxy->net_ns, file, &ifr); | |
1108 | if (ret) | |
631ab46b | 1109 | break; |
e3b99556 MM |
1110 | |
1111 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
631ab46b | 1112 | ret = -EFAULT; |
e3b99556 MM |
1113 | break; |
1114 | ||
1da177e4 LT |
1115 | case TUNSETNOCSUM: |
1116 | /* Disable/Enable checksum */ | |
1117 | if (arg) | |
1118 | tun->flags |= TUN_NOCHECKSUM; | |
1119 | else | |
1120 | tun->flags &= ~TUN_NOCHECKSUM; | |
1121 | ||
1122 | DBG(KERN_INFO "%s: checksum %s\n", | |
1123 | tun->dev->name, arg ? "disabled" : "enabled"); | |
1124 | break; | |
1125 | ||
1126 | case TUNSETPERSIST: | |
1127 | /* Disable/Enable persist mode */ | |
1128 | if (arg) | |
1129 | tun->flags |= TUN_PERSIST; | |
1130 | else | |
1131 | tun->flags &= ~TUN_PERSIST; | |
1132 | ||
1133 | DBG(KERN_INFO "%s: persist %s\n", | |
c6e991de | 1134 | tun->dev->name, arg ? "enabled" : "disabled"); |
1da177e4 LT |
1135 | break; |
1136 | ||
1137 | case TUNSETOWNER: | |
1138 | /* Set owner of the device */ | |
1139 | tun->owner = (uid_t) arg; | |
1140 | ||
1141 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
1142 | break; | |
1143 | ||
8c644623 GG |
1144 | case TUNSETGROUP: |
1145 | /* Set group of the device */ | |
1146 | tun->group= (gid_t) arg; | |
1147 | ||
1148 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); | |
1149 | break; | |
1150 | ||
ff4cc3ac MK |
1151 | case TUNSETLINK: |
1152 | /* Only allow setting the type when the interface is down */ | |
48abfe05 | 1153 | rtnl_lock(); |
ff4cc3ac MK |
1154 | if (tun->dev->flags & IFF_UP) { |
1155 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
1156 | tun->dev->name); | |
48abfe05 | 1157 | ret = -EBUSY; |
ff4cc3ac MK |
1158 | } else { |
1159 | tun->dev->type = (int) arg; | |
1160 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
48abfe05 | 1161 | ret = 0; |
ff4cc3ac | 1162 | } |
48abfe05 | 1163 | rtnl_unlock(); |
631ab46b | 1164 | break; |
ff4cc3ac | 1165 | |
1da177e4 LT |
1166 | #ifdef TUN_DEBUG |
1167 | case TUNSETDEBUG: | |
1168 | tun->debug = arg; | |
1169 | break; | |
1170 | #endif | |
5228ddc9 | 1171 | case TUNSETOFFLOAD: |
5228ddc9 RR |
1172 | rtnl_lock(); |
1173 | ret = set_offload(tun->dev, arg); | |
1174 | rtnl_unlock(); | |
631ab46b | 1175 | break; |
5228ddc9 | 1176 | |
f271b2cc MK |
1177 | case TUNSETTXFILTER: |
1178 | /* Can be set only for TAPs */ | |
631ab46b | 1179 | ret = -EINVAL; |
f271b2cc | 1180 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 1181 | break; |
f271b2cc | 1182 | rtnl_lock(); |
c0e5a8c2 | 1183 | ret = update_filter(&tun->txflt, (void __user *)arg); |
f271b2cc | 1184 | rtnl_unlock(); |
631ab46b | 1185 | break; |
1da177e4 LT |
1186 | |
1187 | case SIOCGIFHWADDR: | |
f271b2cc MK |
1188 | /* Get hw addres */ |
1189 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); | |
1190 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
1191 | if (copy_to_user(argp, &ifr, sizeof ifr)) | |
631ab46b EB |
1192 | ret = -EFAULT; |
1193 | break; | |
1da177e4 LT |
1194 | |
1195 | case SIOCSIFHWADDR: | |
f271b2cc | 1196 | /* Set hw address */ |
e174961c JB |
1197 | DBG(KERN_DEBUG "%s: set hw address: %pM\n", |
1198 | tun->dev->name, ifr.ifr_hwaddr.sa_data); | |
40102371 KH |
1199 | |
1200 | rtnl_lock(); | |
1201 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); | |
1202 | rtnl_unlock(); | |
631ab46b | 1203 | break; |
33dccbb0 HX |
1204 | |
1205 | case TUNGETSNDBUF: | |
1206 | sndbuf = tun->sk->sk_sndbuf; | |
1207 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) | |
1208 | ret = -EFAULT; | |
1209 | break; | |
1210 | ||
1211 | case TUNSETSNDBUF: | |
1212 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
1213 | ret = -EFAULT; | |
1214 | break; | |
1215 | } | |
1216 | ||
1217 | tun->sk->sk_sndbuf = sndbuf; | |
1218 | break; | |
1219 | ||
1da177e4 | 1220 | default: |
631ab46b EB |
1221 | ret = -EINVAL; |
1222 | break; | |
1da177e4 LT |
1223 | }; |
1224 | ||
631ab46b EB |
1225 | tun_put(tun); |
1226 | return ret; | |
1da177e4 LT |
1227 | } |
1228 | ||
1229 | static int tun_chr_fasync(int fd, struct file *file, int on) | |
1230 | { | |
631ab46b | 1231 | struct tun_struct *tun = tun_get(file); |
1da177e4 LT |
1232 | int ret; |
1233 | ||
1234 | if (!tun) | |
1235 | return -EBADFD; | |
1236 | ||
1237 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
1238 | ||
9d319522 | 1239 | lock_kernel(); |
1da177e4 | 1240 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) |
9d319522 | 1241 | goto out; |
6aa20a22 | 1242 | |
1da177e4 | 1243 | if (on) { |
609d7fa9 | 1244 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 1245 | if (ret) |
9d319522 | 1246 | goto out; |
1da177e4 | 1247 | tun->flags |= TUN_FASYNC; |
6aa20a22 | 1248 | } else |
1da177e4 | 1249 | tun->flags &= ~TUN_FASYNC; |
9d319522 JC |
1250 | ret = 0; |
1251 | out: | |
1252 | unlock_kernel(); | |
631ab46b | 1253 | tun_put(tun); |
9d319522 | 1254 | return ret; |
1da177e4 LT |
1255 | } |
1256 | ||
1257 | static int tun_chr_open(struct inode *inode, struct file * file) | |
1258 | { | |
631ab46b | 1259 | struct tun_file *tfile; |
fd3e05b6 | 1260 | cycle_kernel_lock(); |
1da177e4 | 1261 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); |
631ab46b EB |
1262 | |
1263 | tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); | |
1264 | if (!tfile) | |
1265 | return -ENOMEM; | |
c70f1829 | 1266 | atomic_set(&tfile->count, 0); |
631ab46b | 1267 | tfile->tun = NULL; |
36b50bab | 1268 | tfile->net = get_net(current->nsproxy->net_ns); |
b2430de3 | 1269 | init_waitqueue_head(&tfile->read_wait); |
631ab46b | 1270 | file->private_data = tfile; |
1da177e4 LT |
1271 | return 0; |
1272 | } | |
1273 | ||
1274 | static int tun_chr_close(struct inode *inode, struct file *file) | |
1275 | { | |
631ab46b EB |
1276 | struct tun_file *tfile = file->private_data; |
1277 | struct tun_struct *tun = __tun_get(tfile); | |
1da177e4 | 1278 | |
1da177e4 | 1279 | |
631ab46b EB |
1280 | if (tun) { |
1281 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); | |
1da177e4 | 1282 | |
631ab46b EB |
1283 | rtnl_lock(); |
1284 | __tun_detach(tun); | |
1da177e4 | 1285 | |
631ab46b | 1286 | /* If desireable, unregister the netdevice. */ |
33dccbb0 HX |
1287 | if (!(tun->flags & TUN_PERSIST)) { |
1288 | sock_put(tun->sk); | |
631ab46b | 1289 | unregister_netdevice(tun->dev); |
33dccbb0 | 1290 | } |
1da177e4 | 1291 | |
631ab46b EB |
1292 | rtnl_unlock(); |
1293 | } | |
1da177e4 | 1294 | |
36b50bab | 1295 | put_net(tfile->net); |
631ab46b | 1296 | kfree(tfile); |
1da177e4 LT |
1297 | |
1298 | return 0; | |
1299 | } | |
1300 | ||
d54b1fdb | 1301 | static const struct file_operations tun_fops = { |
6aa20a22 | 1302 | .owner = THIS_MODULE, |
1da177e4 | 1303 | .llseek = no_llseek, |
ee0b3e67 BP |
1304 | .read = do_sync_read, |
1305 | .aio_read = tun_chr_aio_read, | |
1306 | .write = do_sync_write, | |
1307 | .aio_write = tun_chr_aio_write, | |
1da177e4 LT |
1308 | .poll = tun_chr_poll, |
1309 | .ioctl = tun_chr_ioctl, | |
1310 | .open = tun_chr_open, | |
1311 | .release = tun_chr_close, | |
6aa20a22 | 1312 | .fasync = tun_chr_fasync |
1da177e4 LT |
1313 | }; |
1314 | ||
1315 | static struct miscdevice tun_miscdev = { | |
1316 | .minor = TUN_MINOR, | |
1317 | .name = "tun", | |
1318 | .fops = &tun_fops, | |
1da177e4 LT |
1319 | }; |
1320 | ||
1321 | /* ethtool interface */ | |
1322 | ||
1323 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1324 | { | |
1325 | cmd->supported = 0; | |
1326 | cmd->advertising = 0; | |
1327 | cmd->speed = SPEED_10; | |
1328 | cmd->duplex = DUPLEX_FULL; | |
1329 | cmd->port = PORT_TP; | |
1330 | cmd->phy_address = 0; | |
1331 | cmd->transceiver = XCVR_INTERNAL; | |
1332 | cmd->autoneg = AUTONEG_DISABLE; | |
1333 | cmd->maxtxpkt = 0; | |
1334 | cmd->maxrxpkt = 0; | |
1335 | return 0; | |
1336 | } | |
1337 | ||
1338 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
1339 | { | |
1340 | struct tun_struct *tun = netdev_priv(dev); | |
1341 | ||
1342 | strcpy(info->driver, DRV_NAME); | |
1343 | strcpy(info->version, DRV_VERSION); | |
1344 | strcpy(info->fw_version, "N/A"); | |
1345 | ||
1346 | switch (tun->flags & TUN_TYPE_MASK) { | |
1347 | case TUN_TUN_DEV: | |
1348 | strcpy(info->bus_info, "tun"); | |
1349 | break; | |
1350 | case TUN_TAP_DEV: | |
1351 | strcpy(info->bus_info, "tap"); | |
1352 | break; | |
1353 | } | |
1354 | } | |
1355 | ||
1356 | static u32 tun_get_msglevel(struct net_device *dev) | |
1357 | { | |
1358 | #ifdef TUN_DEBUG | |
1359 | struct tun_struct *tun = netdev_priv(dev); | |
1360 | return tun->debug; | |
1361 | #else | |
1362 | return -EOPNOTSUPP; | |
1363 | #endif | |
1364 | } | |
1365 | ||
1366 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
1367 | { | |
1368 | #ifdef TUN_DEBUG | |
1369 | struct tun_struct *tun = netdev_priv(dev); | |
1370 | tun->debug = value; | |
1371 | #endif | |
1372 | } | |
1373 | ||
1374 | static u32 tun_get_link(struct net_device *dev) | |
1375 | { | |
1376 | struct tun_struct *tun = netdev_priv(dev); | |
631ab46b | 1377 | return !!tun->tfile; |
1da177e4 LT |
1378 | } |
1379 | ||
1380 | static u32 tun_get_rx_csum(struct net_device *dev) | |
1381 | { | |
1382 | struct tun_struct *tun = netdev_priv(dev); | |
1383 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
1384 | } | |
1385 | ||
1386 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
1387 | { | |
1388 | struct tun_struct *tun = netdev_priv(dev); | |
1389 | if (data) | |
1390 | tun->flags &= ~TUN_NOCHECKSUM; | |
1391 | else | |
1392 | tun->flags |= TUN_NOCHECKSUM; | |
1393 | return 0; | |
1394 | } | |
1395 | ||
7282d491 | 1396 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
1397 | .get_settings = tun_get_settings, |
1398 | .get_drvinfo = tun_get_drvinfo, | |
1399 | .get_msglevel = tun_get_msglevel, | |
1400 | .set_msglevel = tun_set_msglevel, | |
1401 | .get_link = tun_get_link, | |
1402 | .get_rx_csum = tun_get_rx_csum, | |
1403 | .set_rx_csum = tun_set_rx_csum | |
1404 | }; | |
1405 | ||
79d17604 | 1406 | |
1da177e4 LT |
1407 | static int __init tun_init(void) |
1408 | { | |
1409 | int ret = 0; | |
1410 | ||
1411 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
1412 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
1413 | ||
f019a7a5 | 1414 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 1415 | if (ret) { |
f019a7a5 EB |
1416 | printk(KERN_ERR "tun: Can't register link_ops\n"); |
1417 | goto err_linkops; | |
79d17604 PE |
1418 | } |
1419 | ||
1da177e4 | 1420 | ret = misc_register(&tun_miscdev); |
79d17604 | 1421 | if (ret) { |
1da177e4 | 1422 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
1423 | goto err_misc; |
1424 | } | |
f019a7a5 | 1425 | return 0; |
79d17604 | 1426 | err_misc: |
f019a7a5 EB |
1427 | rtnl_link_unregister(&tun_link_ops); |
1428 | err_linkops: | |
1da177e4 LT |
1429 | return ret; |
1430 | } | |
1431 | ||
1432 | static void tun_cleanup(void) | |
1433 | { | |
6aa20a22 | 1434 | misc_deregister(&tun_miscdev); |
f019a7a5 | 1435 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
1436 | } |
1437 | ||
1438 | module_init(tun_init); | |
1439 | module_exit(tun_cleanup); | |
1440 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1441 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1442 | MODULE_LICENSE("GPL"); | |
1443 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |