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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> | |
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; |
d9d52b51 MT |
113 | |
114 | int vnet_hdr_sz; | |
115 | ||
14daa021 RR |
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; |
38231b7a | 134 | int err; |
a7385ba2 EB |
135 | |
136 | ASSERT_RTNL(); | |
137 | ||
38231b7a EB |
138 | netif_tx_lock_bh(tun->dev); |
139 | ||
140 | err = -EINVAL; | |
141 | if (tfile->tun) | |
142 | goto out; | |
143 | ||
144 | err = -EBUSY; | |
145 | if (tun->tfile) | |
146 | goto out; | |
147 | ||
148 | err = 0; | |
631ab46b EB |
149 | tfile->tun = tun; |
150 | tun->tfile = tfile; | |
05c2828c | 151 | tun->socket.file = file; |
c70f1829 | 152 | dev_hold(tun->dev); |
89f56d1e | 153 | sock_hold(tun->socket.sk); |
c70f1829 | 154 | atomic_inc(&tfile->count); |
a7385ba2 | 155 | |
38231b7a EB |
156 | out: |
157 | netif_tx_unlock_bh(tun->dev); | |
158 | return err; | |
a7385ba2 EB |
159 | } |
160 | ||
631ab46b EB |
161 | static void __tun_detach(struct tun_struct *tun) |
162 | { | |
631ab46b | 163 | /* Detach from net device */ |
38231b7a | 164 | netif_tx_lock_bh(tun->dev); |
631ab46b | 165 | tun->tfile = NULL; |
05c2828c | 166 | tun->socket.file = NULL; |
38231b7a | 167 | netif_tx_unlock_bh(tun->dev); |
631ab46b EB |
168 | |
169 | /* Drop read queue */ | |
89f56d1e | 170 | skb_queue_purge(&tun->socket.sk->sk_receive_queue); |
c70f1829 EB |
171 | |
172 | /* Drop the extra count on the net device */ | |
173 | dev_put(tun->dev); | |
174 | } | |
175 | ||
176 | static void tun_detach(struct tun_struct *tun) | |
177 | { | |
178 | rtnl_lock(); | |
179 | __tun_detach(tun); | |
180 | rtnl_unlock(); | |
631ab46b EB |
181 | } |
182 | ||
183 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
184 | { | |
c70f1829 EB |
185 | struct tun_struct *tun = NULL; |
186 | ||
187 | if (atomic_inc_not_zero(&tfile->count)) | |
188 | tun = tfile->tun; | |
189 | ||
190 | return tun; | |
631ab46b EB |
191 | } |
192 | ||
193 | static struct tun_struct *tun_get(struct file *file) | |
194 | { | |
195 | return __tun_get(file->private_data); | |
196 | } | |
197 | ||
198 | static void tun_put(struct tun_struct *tun) | |
199 | { | |
c70f1829 EB |
200 | struct tun_file *tfile = tun->tfile; |
201 | ||
202 | if (atomic_dec_and_test(&tfile->count)) | |
203 | tun_detach(tfile->tun); | |
631ab46b EB |
204 | } |
205 | ||
f271b2cc MK |
206 | /* TAP filterting */ |
207 | static void addr_hash_set(u32 *mask, const u8 *addr) | |
208 | { | |
209 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
210 | mask[n >> 5] |= (1 << (n & 31)); | |
211 | } | |
212 | ||
213 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
214 | { | |
215 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
216 | return mask[n >> 5] & (1 << (n & 31)); | |
217 | } | |
218 | ||
219 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
220 | { | |
221 | struct { u8 u[ETH_ALEN]; } *addr; | |
222 | struct tun_filter uf; | |
223 | int err, alen, n, nexact; | |
224 | ||
225 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
226 | return -EFAULT; | |
227 | ||
228 | if (!uf.count) { | |
229 | /* Disabled */ | |
230 | filter->count = 0; | |
231 | return 0; | |
232 | } | |
233 | ||
234 | alen = ETH_ALEN * uf.count; | |
235 | addr = kmalloc(alen, GFP_KERNEL); | |
236 | if (!addr) | |
237 | return -ENOMEM; | |
238 | ||
239 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
240 | err = -EFAULT; | |
241 | goto done; | |
242 | } | |
243 | ||
244 | /* The filter is updated without holding any locks. Which is | |
245 | * perfectly safe. We disable it first and in the worst | |
246 | * case we'll accept a few undesired packets. */ | |
247 | filter->count = 0; | |
248 | wmb(); | |
249 | ||
250 | /* Use first set of addresses as an exact filter */ | |
251 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
252 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
253 | ||
254 | nexact = n; | |
255 | ||
cfbf84fc AW |
256 | /* Remaining multicast addresses are hashed, |
257 | * unicast will leave the filter disabled. */ | |
f271b2cc | 258 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
259 | for (; n < uf.count; n++) { |
260 | if (!is_multicast_ether_addr(addr[n].u)) { | |
261 | err = 0; /* no filter */ | |
262 | goto done; | |
263 | } | |
f271b2cc | 264 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 265 | } |
f271b2cc MK |
266 | |
267 | /* For ALLMULTI just set the mask to all ones. | |
268 | * This overrides the mask populated above. */ | |
269 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
270 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
271 | ||
272 | /* Now enable the filter */ | |
273 | wmb(); | |
274 | filter->count = nexact; | |
275 | ||
276 | /* Return the number of exact filters */ | |
277 | err = nexact; | |
278 | ||
279 | done: | |
280 | kfree(addr); | |
281 | return err; | |
282 | } | |
283 | ||
284 | /* Returns: 0 - drop, !=0 - accept */ | |
285 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
286 | { | |
287 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
288 | * at this point. */ | |
289 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
290 | int i; | |
291 | ||
292 | /* Exact match */ | |
293 | for (i = 0; i < filter->count; i++) | |
294 | if (!compare_ether_addr(eh->h_dest, filter->addr[i])) | |
295 | return 1; | |
296 | ||
297 | /* Inexact match (multicast only) */ | |
298 | if (is_multicast_ether_addr(eh->h_dest)) | |
299 | return addr_hash_test(filter->mask, eh->h_dest); | |
300 | ||
301 | return 0; | |
302 | } | |
303 | ||
304 | /* | |
305 | * Checks whether the packet is accepted or not. | |
306 | * Returns: 0 - drop, !=0 - accept | |
307 | */ | |
308 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
309 | { | |
310 | if (!filter->count) | |
311 | return 1; | |
312 | ||
313 | return run_filter(filter, skb); | |
314 | } | |
315 | ||
1da177e4 LT |
316 | /* Network device part of the driver */ |
317 | ||
7282d491 | 318 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 319 | |
c70f1829 EB |
320 | /* Net device detach from fd. */ |
321 | static void tun_net_uninit(struct net_device *dev) | |
322 | { | |
323 | struct tun_struct *tun = netdev_priv(dev); | |
324 | struct tun_file *tfile = tun->tfile; | |
325 | ||
326 | /* Inform the methods they need to stop using the dev. | |
327 | */ | |
328 | if (tfile) { | |
43815482 | 329 | wake_up_all(&tun->wq.wait); |
c70f1829 EB |
330 | if (atomic_dec_and_test(&tfile->count)) |
331 | __tun_detach(tun); | |
332 | } | |
333 | } | |
334 | ||
9c3fea6a HX |
335 | static void tun_free_netdev(struct net_device *dev) |
336 | { | |
337 | struct tun_struct *tun = netdev_priv(dev); | |
338 | ||
89f56d1e | 339 | sock_put(tun->socket.sk); |
9c3fea6a HX |
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 */ | |
424efe9c | 357 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
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 | ||
99405162 MT |
373 | if (tun->socket.sk->sk_filter && |
374 | sk_filter(tun->socket.sk, skb)) | |
375 | goto drop; | |
376 | ||
89f56d1e | 377 | if (skb_queue_len(&tun->socket.sk->sk_receive_queue) >= dev->tx_queue_len) { |
1da177e4 LT |
378 | if (!(tun->flags & TUN_ONE_QUEUE)) { |
379 | /* Normal queueing mode. */ | |
380 | /* Packet scheduler handles dropping of further packets. */ | |
381 | netif_stop_queue(dev); | |
382 | ||
383 | /* We won't see all dropped packets individually, so overrun | |
384 | * error is more appropriate. */ | |
09f75cd7 | 385 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
386 | } else { |
387 | /* Single queue mode. | |
388 | * Driver handles dropping of all packets itself. */ | |
389 | goto drop; | |
390 | } | |
391 | } | |
392 | ||
0110d6f2 MT |
393 | /* Orphan the skb - required as we might hang on to it |
394 | * for indefinite time. */ | |
395 | skb_orphan(skb); | |
396 | ||
f271b2cc | 397 | /* Enqueue packet */ |
89f56d1e | 398 | skb_queue_tail(&tun->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
399 | |
400 | /* Notify and wake up reader process */ | |
401 | if (tun->flags & TUN_FASYNC) | |
402 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
43815482 | 403 | wake_up_interruptible_poll(&tun->wq.wait, POLLIN | |
05c2828c | 404 | POLLRDNORM | POLLRDBAND); |
6ed10654 | 405 | return NETDEV_TX_OK; |
1da177e4 LT |
406 | |
407 | drop: | |
09f75cd7 | 408 | dev->stats.tx_dropped++; |
1da177e4 | 409 | kfree_skb(skb); |
6ed10654 | 410 | return NETDEV_TX_OK; |
1da177e4 LT |
411 | } |
412 | ||
f271b2cc | 413 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 414 | { |
f271b2cc MK |
415 | /* |
416 | * This callback is supposed to deal with mc filter in | |
417 | * _rx_ path and has nothing to do with the _tx_ path. | |
418 | * In rx path we always accept everything userspace gives us. | |
419 | */ | |
1da177e4 LT |
420 | } |
421 | ||
4885a504 ES |
422 | #define MIN_MTU 68 |
423 | #define MAX_MTU 65535 | |
424 | ||
425 | static int | |
426 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
427 | { | |
428 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
429 | return -EINVAL; | |
430 | dev->mtu = new_mtu; | |
431 | return 0; | |
432 | } | |
433 | ||
758e43b7 | 434 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 435 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
436 | .ndo_open = tun_net_open, |
437 | .ndo_stop = tun_net_close, | |
00829823 | 438 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 439 | .ndo_change_mtu = tun_net_change_mtu, |
758e43b7 SH |
440 | }; |
441 | ||
442 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 443 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
444 | .ndo_open = tun_net_open, |
445 | .ndo_stop = tun_net_close, | |
00829823 | 446 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 SH |
447 | .ndo_change_mtu = tun_net_change_mtu, |
448 | .ndo_set_multicast_list = tun_net_mclist, | |
449 | .ndo_set_mac_address = eth_mac_addr, | |
450 | .ndo_validate_addr = eth_validate_addr, | |
451 | }; | |
452 | ||
1da177e4 LT |
453 | /* Initialize net device. */ |
454 | static void tun_net_init(struct net_device *dev) | |
455 | { | |
456 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 457 | |
1da177e4 LT |
458 | switch (tun->flags & TUN_TYPE_MASK) { |
459 | case TUN_TUN_DEV: | |
758e43b7 SH |
460 | dev->netdev_ops = &tun_netdev_ops; |
461 | ||
1da177e4 LT |
462 | /* Point-to-Point TUN Device */ |
463 | dev->hard_header_len = 0; | |
464 | dev->addr_len = 0; | |
465 | dev->mtu = 1500; | |
466 | ||
467 | /* Zero header length */ | |
6aa20a22 | 468 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
469 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
470 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
471 | break; | |
472 | ||
473 | case TUN_TAP_DEV: | |
7a0a9608 | 474 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 475 | /* Ethernet TAP Device */ |
1da177e4 | 476 | ether_setup(dev); |
36226a8d | 477 | |
f271b2cc | 478 | random_ether_addr(dev->dev_addr); |
36226a8d | 479 | |
1da177e4 LT |
480 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
481 | break; | |
482 | } | |
483 | } | |
484 | ||
485 | /* Character device part */ | |
486 | ||
487 | /* Poll */ | |
488 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 489 | { |
b2430de3 EB |
490 | struct tun_file *tfile = file->private_data; |
491 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 492 | struct sock *sk; |
33dccbb0 | 493 | unsigned int mask = 0; |
1da177e4 LT |
494 | |
495 | if (!tun) | |
eac9e902 | 496 | return POLLERR; |
1da177e4 | 497 | |
89f56d1e | 498 | sk = tun->socket.sk; |
3c8a9c63 | 499 | |
1da177e4 LT |
500 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); |
501 | ||
43815482 | 502 | poll_wait(file, &tun->wq.wait, wait); |
6aa20a22 | 503 | |
89f56d1e | 504 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
505 | mask |= POLLIN | POLLRDNORM; |
506 | ||
33dccbb0 HX |
507 | if (sock_writeable(sk) || |
508 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
509 | sock_writeable(sk))) | |
510 | mask |= POLLOUT | POLLWRNORM; | |
511 | ||
c70f1829 EB |
512 | if (tun->dev->reg_state != NETREG_REGISTERED) |
513 | mask = POLLERR; | |
514 | ||
631ab46b | 515 | tun_put(tun); |
1da177e4 LT |
516 | return mask; |
517 | } | |
518 | ||
f42157cb RR |
519 | /* prepad is the amount to reserve at front. len is length after that. |
520 | * linear is a hint as to how much to copy (usually headers). */ | |
33dccbb0 HX |
521 | static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun, |
522 | size_t prepad, size_t len, | |
523 | size_t linear, int noblock) | |
f42157cb | 524 | { |
89f56d1e | 525 | struct sock *sk = tun->socket.sk; |
f42157cb | 526 | struct sk_buff *skb; |
33dccbb0 | 527 | int err; |
f42157cb RR |
528 | |
529 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 530 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 531 | linear = len; |
f42157cb | 532 | |
33dccbb0 HX |
533 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
534 | &err); | |
f42157cb | 535 | if (!skb) |
33dccbb0 | 536 | return ERR_PTR(err); |
f42157cb RR |
537 | |
538 | skb_reserve(skb, prepad); | |
539 | skb_put(skb, linear); | |
33dccbb0 HX |
540 | skb->data_len = len - linear; |
541 | skb->len += len - linear; | |
f42157cb RR |
542 | |
543 | return skb; | |
544 | } | |
545 | ||
1da177e4 | 546 | /* Get packet from user space buffer */ |
33dccbb0 | 547 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, |
6f26c9a7 | 548 | const struct iovec *iv, size_t count, |
33dccbb0 | 549 | int noblock) |
1da177e4 | 550 | { |
09640e63 | 551 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 LT |
552 | struct sk_buff *skb; |
553 | size_t len = count, align = 0; | |
f43798c2 | 554 | struct virtio_net_hdr gso = { 0 }; |
6f26c9a7 | 555 | int offset = 0; |
1da177e4 LT |
556 | |
557 | if (!(tun->flags & TUN_NO_PI)) { | |
558 | if ((len -= sizeof(pi)) > count) | |
559 | return -EINVAL; | |
560 | ||
6f26c9a7 | 561 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 562 | return -EFAULT; |
6f26c9a7 | 563 | offset += sizeof(pi); |
1da177e4 LT |
564 | } |
565 | ||
f43798c2 | 566 | if (tun->flags & TUN_VNET_HDR) { |
d9d52b51 | 567 | if ((len -= tun->vnet_hdr_sz) > count) |
f43798c2 RR |
568 | return -EINVAL; |
569 | ||
6f26c9a7 | 570 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
571 | return -EFAULT; |
572 | ||
4909122f HX |
573 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
574 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
575 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
576 | ||
f43798c2 RR |
577 | if (gso.hdr_len > len) |
578 | return -EINVAL; | |
d9d52b51 | 579 | offset += tun->vnet_hdr_sz; |
f43798c2 RR |
580 | } |
581 | ||
e01bf1c8 | 582 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
1da177e4 | 583 | align = NET_IP_ALIGN; |
0eca93bc HX |
584 | if (unlikely(len < ETH_HLEN || |
585 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
586 | return -EINVAL; |
587 | } | |
6aa20a22 | 588 | |
33dccbb0 HX |
589 | skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock); |
590 | if (IS_ERR(skb)) { | |
591 | if (PTR_ERR(skb) != -EAGAIN) | |
592 | tun->dev->stats.rx_dropped++; | |
593 | return PTR_ERR(skb); | |
1da177e4 LT |
594 | } |
595 | ||
6f26c9a7 | 596 | if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) { |
09f75cd7 | 597 | tun->dev->stats.rx_dropped++; |
8f22757e | 598 | kfree_skb(skb); |
1da177e4 | 599 | return -EFAULT; |
8f22757e | 600 | } |
1da177e4 | 601 | |
f43798c2 RR |
602 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
603 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
604 | gso.csum_offset)) { | |
605 | tun->dev->stats.rx_frame_errors++; | |
606 | kfree_skb(skb); | |
607 | return -EINVAL; | |
608 | } | |
609 | } else if (tun->flags & TUN_NOCHECKSUM) | |
610 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
611 | ||
1da177e4 LT |
612 | switch (tun->flags & TUN_TYPE_MASK) { |
613 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
614 | if (tun->flags & TUN_NO_PI) { |
615 | switch (skb->data[0] & 0xf0) { | |
616 | case 0x40: | |
617 | pi.proto = htons(ETH_P_IP); | |
618 | break; | |
619 | case 0x60: | |
620 | pi.proto = htons(ETH_P_IPV6); | |
621 | break; | |
622 | default: | |
623 | tun->dev->stats.rx_dropped++; | |
624 | kfree_skb(skb); | |
625 | return -EINVAL; | |
626 | } | |
627 | } | |
628 | ||
459a98ed | 629 | skb_reset_mac_header(skb); |
1da177e4 | 630 | skb->protocol = pi.proto; |
4c13eb66 | 631 | skb->dev = tun->dev; |
1da177e4 LT |
632 | break; |
633 | case TUN_TAP_DEV: | |
634 | skb->protocol = eth_type_trans(skb, tun->dev); | |
635 | break; | |
636 | }; | |
637 | ||
f43798c2 RR |
638 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
639 | pr_debug("GSO!\n"); | |
640 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
641 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
642 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
643 | break; | |
644 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
645 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
646 | break; | |
e36aa25a SS |
647 | case VIRTIO_NET_HDR_GSO_UDP: |
648 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
649 | break; | |
f43798c2 RR |
650 | default: |
651 | tun->dev->stats.rx_frame_errors++; | |
652 | kfree_skb(skb); | |
653 | return -EINVAL; | |
654 | } | |
655 | ||
656 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
657 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
658 | ||
659 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
660 | if (skb_shinfo(skb)->gso_size == 0) { | |
661 | tun->dev->stats.rx_frame_errors++; | |
662 | kfree_skb(skb); | |
663 | return -EINVAL; | |
664 | } | |
665 | ||
666 | /* Header must be checked, and gso_segs computed. */ | |
667 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
668 | skb_shinfo(skb)->gso_segs = 0; | |
669 | } | |
6aa20a22 | 670 | |
1da177e4 | 671 | netif_rx_ni(skb); |
6aa20a22 | 672 | |
09f75cd7 JG |
673 | tun->dev->stats.rx_packets++; |
674 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
675 | |
676 | return count; | |
6aa20a22 | 677 | } |
1da177e4 | 678 | |
ee0b3e67 BP |
679 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
680 | unsigned long count, loff_t pos) | |
1da177e4 | 681 | { |
33dccbb0 | 682 | struct file *file = iocb->ki_filp; |
ab46d779 | 683 | struct tun_struct *tun = tun_get(file); |
631ab46b | 684 | ssize_t result; |
1da177e4 LT |
685 | |
686 | if (!tun) | |
687 | return -EBADFD; | |
688 | ||
689 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
690 | ||
6f26c9a7 | 691 | result = tun_get_user(tun, iv, iov_length(iv, count), |
33dccbb0 | 692 | file->f_flags & O_NONBLOCK); |
631ab46b EB |
693 | |
694 | tun_put(tun); | |
695 | return result; | |
1da177e4 LT |
696 | } |
697 | ||
1da177e4 LT |
698 | /* Put packet to the user space buffer */ |
699 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
700 | struct sk_buff *skb, | |
43b39dcd | 701 | const struct iovec *iv, int len) |
1da177e4 LT |
702 | { |
703 | struct tun_pi pi = { 0, skb->protocol }; | |
704 | ssize_t total = 0; | |
705 | ||
706 | if (!(tun->flags & TUN_NO_PI)) { | |
707 | if ((len -= sizeof(pi)) < 0) | |
708 | return -EINVAL; | |
709 | ||
710 | if (len < skb->len) { | |
711 | /* Packet will be striped */ | |
712 | pi.flags |= TUN_PKT_STRIP; | |
713 | } | |
6aa20a22 | 714 | |
43b39dcd | 715 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
716 | return -EFAULT; |
717 | total += sizeof(pi); | |
6aa20a22 | 718 | } |
1da177e4 | 719 | |
f43798c2 RR |
720 | if (tun->flags & TUN_VNET_HDR) { |
721 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
d9d52b51 | 722 | if ((len -= tun->vnet_hdr_sz) < 0) |
f43798c2 RR |
723 | return -EINVAL; |
724 | ||
725 | if (skb_is_gso(skb)) { | |
726 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
727 | ||
728 | /* This is a hint as to how much should be linear. */ | |
729 | gso.hdr_len = skb_headlen(skb); | |
730 | gso.gso_size = sinfo->gso_size; | |
731 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
732 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
733 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
734 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e36aa25a SS |
735 | else if (sinfo->gso_type & SKB_GSO_UDP) |
736 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
f43798c2 RR |
737 | else |
738 | BUG(); | |
739 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
740 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
741 | } else | |
742 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
743 | ||
744 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
745 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
746 | gso.csum_start = skb->csum_start - skb_headroom(skb); | |
747 | gso.csum_offset = skb->csum_offset; | |
748 | } /* else everything is zero */ | |
749 | ||
43b39dcd MT |
750 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
751 | sizeof(gso)))) | |
f43798c2 | 752 | return -EFAULT; |
d9d52b51 | 753 | total += tun->vnet_hdr_sz; |
f43798c2 RR |
754 | } |
755 | ||
1da177e4 LT |
756 | len = min_t(int, skb->len, len); |
757 | ||
43b39dcd | 758 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
05c2828c | 759 | total += skb->len; |
1da177e4 | 760 | |
09f75cd7 JG |
761 | tun->dev->stats.tx_packets++; |
762 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
763 | |
764 | return total; | |
765 | } | |
766 | ||
05c2828c MT |
767 | static ssize_t tun_do_read(struct tun_struct *tun, |
768 | struct kiocb *iocb, const struct iovec *iv, | |
769 | ssize_t len, int noblock) | |
1da177e4 | 770 | { |
1da177e4 LT |
771 | DECLARE_WAITQUEUE(wait, current); |
772 | struct sk_buff *skb; | |
05c2828c | 773 | ssize_t ret = 0; |
1da177e4 LT |
774 | |
775 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
776 | ||
43815482 | 777 | add_wait_queue(&tun->wq.wait, &wait); |
1da177e4 | 778 | while (len) { |
1da177e4 LT |
779 | current->state = TASK_INTERRUPTIBLE; |
780 | ||
781 | /* Read frames from the queue */ | |
89f56d1e | 782 | if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) { |
05c2828c | 783 | if (noblock) { |
1da177e4 LT |
784 | ret = -EAGAIN; |
785 | break; | |
786 | } | |
787 | if (signal_pending(current)) { | |
788 | ret = -ERESTARTSYS; | |
789 | break; | |
790 | } | |
c70f1829 EB |
791 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
792 | ret = -EIO; | |
793 | break; | |
794 | } | |
1da177e4 LT |
795 | |
796 | /* Nothing to read, let's sleep */ | |
797 | schedule(); | |
798 | continue; | |
799 | } | |
800 | netif_wake_queue(tun->dev); | |
801 | ||
43b39dcd | 802 | ret = tun_put_user(tun, skb, iv, len); |
f271b2cc MK |
803 | kfree_skb(skb); |
804 | break; | |
1da177e4 LT |
805 | } |
806 | ||
807 | current->state = TASK_RUNNING; | |
43815482 | 808 | remove_wait_queue(&tun->wq.wait, &wait); |
1da177e4 | 809 | |
05c2828c MT |
810 | return ret; |
811 | } | |
812 | ||
813 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
814 | unsigned long count, loff_t pos) | |
815 | { | |
816 | struct file *file = iocb->ki_filp; | |
817 | struct tun_file *tfile = file->private_data; | |
818 | struct tun_struct *tun = __tun_get(tfile); | |
819 | ssize_t len, ret; | |
820 | ||
821 | if (!tun) | |
822 | return -EBADFD; | |
823 | len = iov_length(iv, count); | |
824 | if (len < 0) { | |
825 | ret = -EINVAL; | |
826 | goto out; | |
827 | } | |
828 | ||
829 | ret = tun_do_read(tun, iocb, iv, len, file->f_flags & O_NONBLOCK); | |
830 | ret = min_t(ssize_t, ret, len); | |
631ab46b EB |
831 | out: |
832 | tun_put(tun); | |
1da177e4 LT |
833 | return ret; |
834 | } | |
835 | ||
1da177e4 LT |
836 | static void tun_setup(struct net_device *dev) |
837 | { | |
838 | struct tun_struct *tun = netdev_priv(dev); | |
839 | ||
1da177e4 | 840 | tun->owner = -1; |
8c644623 | 841 | tun->group = -1; |
1da177e4 | 842 | |
1da177e4 | 843 | dev->ethtool_ops = &tun_ethtool_ops; |
9c3fea6a | 844 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
845 | } |
846 | ||
f019a7a5 EB |
847 | /* Trivial set of netlink ops to allow deleting tun or tap |
848 | * device with netlink. | |
849 | */ | |
850 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
851 | { | |
852 | return -EINVAL; | |
853 | } | |
854 | ||
855 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
856 | .kind = DRV_NAME, | |
857 | .priv_size = sizeof(struct tun_struct), | |
858 | .setup = tun_setup, | |
859 | .validate = tun_validate, | |
860 | }; | |
861 | ||
33dccbb0 HX |
862 | static void tun_sock_write_space(struct sock *sk) |
863 | { | |
864 | struct tun_struct *tun; | |
43815482 | 865 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
866 | |
867 | if (!sock_writeable(sk)) | |
868 | return; | |
869 | ||
33dccbb0 HX |
870 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
871 | return; | |
872 | ||
43815482 ED |
873 | wqueue = sk_sleep(sk); |
874 | if (wqueue && waitqueue_active(wqueue)) | |
875 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 876 | POLLWRNORM | POLLWRBAND); |
c722c625 | 877 | |
80924e5f | 878 | tun = tun_sk(sk)->tun; |
33dccbb0 HX |
879 | kill_fasync(&tun->fasync, SIGIO, POLL_OUT); |
880 | } | |
881 | ||
882 | static void tun_sock_destruct(struct sock *sk) | |
883 | { | |
80924e5f | 884 | free_netdev(tun_sk(sk)->tun->dev); |
33dccbb0 HX |
885 | } |
886 | ||
05c2828c MT |
887 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
888 | struct msghdr *m, size_t total_len) | |
889 | { | |
890 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
891 | return tun_get_user(tun, m->msg_iov, total_len, | |
892 | m->msg_flags & MSG_DONTWAIT); | |
893 | } | |
894 | ||
895 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, | |
896 | struct msghdr *m, size_t total_len, | |
897 | int flags) | |
898 | { | |
899 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
900 | int ret; | |
901 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) | |
902 | return -EINVAL; | |
903 | ret = tun_do_read(tun, iocb, m->msg_iov, total_len, | |
904 | flags & MSG_DONTWAIT); | |
905 | if (ret > total_len) { | |
906 | m->msg_flags |= MSG_TRUNC; | |
907 | ret = flags & MSG_TRUNC ? ret : total_len; | |
908 | } | |
909 | return ret; | |
910 | } | |
911 | ||
912 | /* Ops structure to mimic raw sockets with tun */ | |
913 | static const struct proto_ops tun_socket_ops = { | |
914 | .sendmsg = tun_sendmsg, | |
915 | .recvmsg = tun_recvmsg, | |
916 | }; | |
917 | ||
33dccbb0 HX |
918 | static struct proto tun_proto = { |
919 | .name = "tun", | |
920 | .owner = THIS_MODULE, | |
921 | .obj_size = sizeof(struct tun_sock), | |
922 | }; | |
f019a7a5 | 923 | |
980c9e8c DW |
924 | static int tun_flags(struct tun_struct *tun) |
925 | { | |
926 | int flags = 0; | |
927 | ||
928 | if (tun->flags & TUN_TUN_DEV) | |
929 | flags |= IFF_TUN; | |
930 | else | |
931 | flags |= IFF_TAP; | |
932 | ||
933 | if (tun->flags & TUN_NO_PI) | |
934 | flags |= IFF_NO_PI; | |
935 | ||
936 | if (tun->flags & TUN_ONE_QUEUE) | |
937 | flags |= IFF_ONE_QUEUE; | |
938 | ||
939 | if (tun->flags & TUN_VNET_HDR) | |
940 | flags |= IFF_VNET_HDR; | |
941 | ||
942 | return flags; | |
943 | } | |
944 | ||
945 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
946 | char *buf) | |
947 | { | |
948 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
949 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
950 | } | |
951 | ||
952 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
953 | char *buf) | |
954 | { | |
955 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
956 | return sprintf(buf, "%d\n", tun->owner); | |
957 | } | |
958 | ||
959 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
960 | char *buf) | |
961 | { | |
962 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
963 | return sprintf(buf, "%d\n", tun->group); | |
964 | } | |
965 | ||
966 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
967 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
968 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
969 | ||
d647a591 | 970 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 | 971 | { |
33dccbb0 | 972 | struct sock *sk; |
1da177e4 LT |
973 | struct tun_struct *tun; |
974 | struct net_device *dev; | |
975 | int err; | |
976 | ||
74a3e5a7 EB |
977 | dev = __dev_get_by_name(net, ifr->ifr_name); |
978 | if (dev) { | |
2b980dbd PM |
979 | const struct cred *cred = current_cred(); |
980 | ||
f85ba780 DW |
981 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
982 | return -EBUSY; | |
74a3e5a7 EB |
983 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
984 | tun = netdev_priv(dev); | |
985 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
986 | tun = netdev_priv(dev); | |
987 | else | |
988 | return -EINVAL; | |
989 | ||
2b980dbd PM |
990 | if (((tun->owner != -1 && cred->euid != tun->owner) || |
991 | (tun->group != -1 && !in_egroup_p(tun->group))) && | |
992 | !capable(CAP_NET_ADMIN)) | |
993 | return -EPERM; | |
d7e9660a | 994 | err = security_tun_dev_attach(tun->socket.sk); |
2b980dbd PM |
995 | if (err < 0) |
996 | return err; | |
997 | ||
a7385ba2 EB |
998 | err = tun_attach(tun, file); |
999 | if (err < 0) | |
1000 | return err; | |
6aa20a22 | 1001 | } |
1da177e4 LT |
1002 | else { |
1003 | char *name; | |
1004 | unsigned long flags = 0; | |
1005 | ||
ca6bb5d7 DW |
1006 | if (!capable(CAP_NET_ADMIN)) |
1007 | return -EPERM; | |
2b980dbd PM |
1008 | err = security_tun_dev_create(); |
1009 | if (err < 0) | |
1010 | return err; | |
ca6bb5d7 | 1011 | |
1da177e4 LT |
1012 | /* Set dev type */ |
1013 | if (ifr->ifr_flags & IFF_TUN) { | |
1014 | /* TUN device */ | |
1015 | flags |= TUN_TUN_DEV; | |
1016 | name = "tun%d"; | |
1017 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1018 | /* TAP device */ | |
1019 | flags |= TUN_TAP_DEV; | |
1020 | name = "tap%d"; | |
6aa20a22 | 1021 | } else |
36989b90 | 1022 | return -EINVAL; |
6aa20a22 | 1023 | |
1da177e4 LT |
1024 | if (*ifr->ifr_name) |
1025 | name = ifr->ifr_name; | |
1026 | ||
1027 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
1028 | tun_setup); | |
1029 | if (!dev) | |
1030 | return -ENOMEM; | |
1031 | ||
fc54c658 | 1032 | dev_net_set(dev, net); |
f019a7a5 | 1033 | dev->rtnl_link_ops = &tun_link_ops; |
758e43b7 | 1034 | |
1da177e4 LT |
1035 | tun = netdev_priv(dev); |
1036 | tun->dev = dev; | |
1037 | tun->flags = flags; | |
f271b2cc | 1038 | tun->txflt.count = 0; |
d9d52b51 | 1039 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
1da177e4 | 1040 | |
33dccbb0 HX |
1041 | err = -ENOMEM; |
1042 | sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto); | |
1043 | if (!sk) | |
1044 | goto err_free_dev; | |
1045 | ||
43815482 ED |
1046 | tun->socket.wq = &tun->wq; |
1047 | init_waitqueue_head(&tun->wq.wait); | |
05c2828c | 1048 | tun->socket.ops = &tun_socket_ops; |
33dccbb0 HX |
1049 | sock_init_data(&tun->socket, sk); |
1050 | sk->sk_write_space = tun_sock_write_space; | |
33dccbb0 | 1051 | sk->sk_sndbuf = INT_MAX; |
33dccbb0 | 1052 | |
80924e5f | 1053 | tun_sk(sk)->tun = tun; |
33dccbb0 | 1054 | |
2b980dbd PM |
1055 | security_tun_dev_post_create(sk); |
1056 | ||
1da177e4 LT |
1057 | tun_net_init(dev); |
1058 | ||
1059 | if (strchr(dev->name, '%')) { | |
1060 | err = dev_alloc_name(dev, dev->name); | |
1061 | if (err < 0) | |
33dccbb0 | 1062 | goto err_free_sk; |
1da177e4 LT |
1063 | } |
1064 | ||
1065 | err = register_netdevice(tun->dev); | |
1066 | if (err < 0) | |
9c3fea6a HX |
1067 | goto err_free_sk; |
1068 | ||
980c9e8c DW |
1069 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1070 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1071 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
1072 | printk(KERN_ERR "Failed to create tun sysfs files\n"); | |
1073 | ||
9c3fea6a | 1074 | sk->sk_destruct = tun_sock_destruct; |
a7385ba2 EB |
1075 | |
1076 | err = tun_attach(tun, file); | |
1077 | if (err < 0) | |
9c3fea6a | 1078 | goto failed; |
1da177e4 LT |
1079 | } |
1080 | ||
1081 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
1082 | ||
1083 | if (ifr->ifr_flags & IFF_NO_PI) | |
1084 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1085 | else |
1086 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
1087 | |
1088 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
1089 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1090 | else |
1091 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1092 | |
f43798c2 RR |
1093 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1094 | tun->flags |= TUN_VNET_HDR; | |
1095 | else | |
1096 | tun->flags &= ~TUN_VNET_HDR; | |
1097 | ||
e35259a9 MK |
1098 | /* Make sure persistent devices do not get stuck in |
1099 | * xoff state. | |
1100 | */ | |
1101 | if (netif_running(tun->dev)) | |
1102 | netif_wake_queue(tun->dev); | |
1103 | ||
1da177e4 LT |
1104 | strcpy(ifr->ifr_name, tun->dev->name); |
1105 | return 0; | |
1106 | ||
33dccbb0 HX |
1107 | err_free_sk: |
1108 | sock_put(sk); | |
1da177e4 LT |
1109 | err_free_dev: |
1110 | free_netdev(dev); | |
1111 | failed: | |
1112 | return err; | |
1113 | } | |
1114 | ||
876bfd4d HX |
1115 | static int tun_get_iff(struct net *net, struct tun_struct *tun, |
1116 | struct ifreq *ifr) | |
e3b99556 | 1117 | { |
e3b99556 MM |
1118 | DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name); |
1119 | ||
1120 | strcpy(ifr->ifr_name, tun->dev->name); | |
1121 | ||
980c9e8c | 1122 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 MM |
1123 | |
1124 | return 0; | |
1125 | } | |
1126 | ||
5228ddc9 RR |
1127 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1128 | * privs required. */ | |
1129 | static int set_offload(struct net_device *dev, unsigned long arg) | |
1130 | { | |
1131 | unsigned int old_features, features; | |
1132 | ||
1133 | old_features = dev->features; | |
1134 | /* Unset features, set them as we chew on the arg. */ | |
1135 | features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST | |
e36aa25a SS |
1136 | |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6 |
1137 | |NETIF_F_UFO)); | |
5228ddc9 RR |
1138 | |
1139 | if (arg & TUN_F_CSUM) { | |
1140 | features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1141 | arg &= ~TUN_F_CSUM; | |
1142 | ||
1143 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1144 | if (arg & TUN_F_TSO_ECN) { | |
1145 | features |= NETIF_F_TSO_ECN; | |
1146 | arg &= ~TUN_F_TSO_ECN; | |
1147 | } | |
1148 | if (arg & TUN_F_TSO4) | |
1149 | features |= NETIF_F_TSO; | |
1150 | if (arg & TUN_F_TSO6) | |
1151 | features |= NETIF_F_TSO6; | |
1152 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1153 | } | |
e36aa25a SS |
1154 | |
1155 | if (arg & TUN_F_UFO) { | |
1156 | features |= NETIF_F_UFO; | |
1157 | arg &= ~TUN_F_UFO; | |
1158 | } | |
5228ddc9 RR |
1159 | } |
1160 | ||
1161 | /* This gives the user a way to test for new features in future by | |
1162 | * trying to set them. */ | |
1163 | if (arg) | |
1164 | return -EINVAL; | |
1165 | ||
1166 | dev->features = features; | |
1167 | if (old_features != dev->features) | |
1168 | netdev_features_change(dev); | |
1169 | ||
1170 | return 0; | |
1171 | } | |
1172 | ||
50857e2a AB |
1173 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1174 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1175 | { |
36b50bab | 1176 | struct tun_file *tfile = file->private_data; |
631ab46b | 1177 | struct tun_struct *tun; |
1da177e4 | 1178 | void __user* argp = (void __user*)arg; |
99405162 | 1179 | struct sock_fprog fprog; |
1da177e4 | 1180 | struct ifreq ifr; |
33dccbb0 | 1181 | int sndbuf; |
d9d52b51 | 1182 | int vnet_hdr_sz; |
f271b2cc | 1183 | int ret; |
1da177e4 LT |
1184 | |
1185 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
50857e2a | 1186 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 LT |
1187 | return -EFAULT; |
1188 | ||
631ab46b EB |
1189 | if (cmd == TUNGETFEATURES) { |
1190 | /* Currently this just means: "what IFF flags are valid?". | |
1191 | * This is needed because we never checked for invalid flags on | |
1192 | * TUNSETIFF. */ | |
1193 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
1194 | IFF_VNET_HDR, | |
1195 | (unsigned int __user*)argp); | |
1196 | } | |
1197 | ||
876bfd4d HX |
1198 | rtnl_lock(); |
1199 | ||
36b50bab | 1200 | tun = __tun_get(tfile); |
1da177e4 | 1201 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1202 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1203 | ||
876bfd4d | 1204 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1205 | |
876bfd4d HX |
1206 | if (ret) |
1207 | goto unlock; | |
1da177e4 | 1208 | |
50857e2a | 1209 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1210 | ret = -EFAULT; |
1211 | goto unlock; | |
1da177e4 LT |
1212 | } |
1213 | ||
876bfd4d | 1214 | ret = -EBADFD; |
1da177e4 | 1215 | if (!tun) |
876bfd4d | 1216 | goto unlock; |
1da177e4 LT |
1217 | |
1218 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
1219 | ||
631ab46b | 1220 | ret = 0; |
1da177e4 | 1221 | switch (cmd) { |
e3b99556 | 1222 | case TUNGETIFF: |
876bfd4d | 1223 | ret = tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1224 | if (ret) |
631ab46b | 1225 | break; |
e3b99556 | 1226 | |
50857e2a | 1227 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1228 | ret = -EFAULT; |
e3b99556 MM |
1229 | break; |
1230 | ||
1da177e4 LT |
1231 | case TUNSETNOCSUM: |
1232 | /* Disable/Enable checksum */ | |
1233 | if (arg) | |
1234 | tun->flags |= TUN_NOCHECKSUM; | |
1235 | else | |
1236 | tun->flags &= ~TUN_NOCHECKSUM; | |
1237 | ||
1238 | DBG(KERN_INFO "%s: checksum %s\n", | |
1239 | tun->dev->name, arg ? "disabled" : "enabled"); | |
1240 | break; | |
1241 | ||
1242 | case TUNSETPERSIST: | |
1243 | /* Disable/Enable persist mode */ | |
1244 | if (arg) | |
1245 | tun->flags |= TUN_PERSIST; | |
1246 | else | |
1247 | tun->flags &= ~TUN_PERSIST; | |
1248 | ||
1249 | DBG(KERN_INFO "%s: persist %s\n", | |
c6e991de | 1250 | tun->dev->name, arg ? "enabled" : "disabled"); |
1da177e4 LT |
1251 | break; |
1252 | ||
1253 | case TUNSETOWNER: | |
1254 | /* Set owner of the device */ | |
1255 | tun->owner = (uid_t) arg; | |
1256 | ||
1257 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
1258 | break; | |
1259 | ||
8c644623 GG |
1260 | case TUNSETGROUP: |
1261 | /* Set group of the device */ | |
1262 | tun->group= (gid_t) arg; | |
1263 | ||
1264 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); | |
1265 | break; | |
1266 | ||
ff4cc3ac MK |
1267 | case TUNSETLINK: |
1268 | /* Only allow setting the type when the interface is down */ | |
1269 | if (tun->dev->flags & IFF_UP) { | |
1270 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
1271 | tun->dev->name); | |
48abfe05 | 1272 | ret = -EBUSY; |
ff4cc3ac MK |
1273 | } else { |
1274 | tun->dev->type = (int) arg; | |
1275 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
48abfe05 | 1276 | ret = 0; |
ff4cc3ac | 1277 | } |
631ab46b | 1278 | break; |
ff4cc3ac | 1279 | |
1da177e4 LT |
1280 | #ifdef TUN_DEBUG |
1281 | case TUNSETDEBUG: | |
1282 | tun->debug = arg; | |
1283 | break; | |
1284 | #endif | |
5228ddc9 | 1285 | case TUNSETOFFLOAD: |
5228ddc9 | 1286 | ret = set_offload(tun->dev, arg); |
631ab46b | 1287 | break; |
5228ddc9 | 1288 | |
f271b2cc MK |
1289 | case TUNSETTXFILTER: |
1290 | /* Can be set only for TAPs */ | |
631ab46b | 1291 | ret = -EINVAL; |
f271b2cc | 1292 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 1293 | break; |
c0e5a8c2 | 1294 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 1295 | break; |
1da177e4 LT |
1296 | |
1297 | case SIOCGIFHWADDR: | |
f271b2cc MK |
1298 | /* Get hw addres */ |
1299 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); | |
1300 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 1301 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
1302 | ret = -EFAULT; |
1303 | break; | |
1da177e4 LT |
1304 | |
1305 | case SIOCSIFHWADDR: | |
f271b2cc | 1306 | /* Set hw address */ |
e174961c JB |
1307 | DBG(KERN_DEBUG "%s: set hw address: %pM\n", |
1308 | tun->dev->name, ifr.ifr_hwaddr.sa_data); | |
40102371 | 1309 | |
40102371 | 1310 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 1311 | break; |
33dccbb0 HX |
1312 | |
1313 | case TUNGETSNDBUF: | |
89f56d1e | 1314 | sndbuf = tun->socket.sk->sk_sndbuf; |
33dccbb0 HX |
1315 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
1316 | ret = -EFAULT; | |
1317 | break; | |
1318 | ||
1319 | case TUNSETSNDBUF: | |
1320 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
1321 | ret = -EFAULT; | |
1322 | break; | |
1323 | } | |
1324 | ||
89f56d1e | 1325 | tun->socket.sk->sk_sndbuf = sndbuf; |
33dccbb0 HX |
1326 | break; |
1327 | ||
d9d52b51 MT |
1328 | case TUNGETVNETHDRSZ: |
1329 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
1330 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
1331 | ret = -EFAULT; | |
1332 | break; | |
1333 | ||
1334 | case TUNSETVNETHDRSZ: | |
1335 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
1336 | ret = -EFAULT; | |
1337 | break; | |
1338 | } | |
1339 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
1340 | ret = -EINVAL; | |
1341 | break; | |
1342 | } | |
1343 | ||
1344 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
1345 | break; | |
1346 | ||
99405162 MT |
1347 | case TUNATTACHFILTER: |
1348 | /* Can be set only for TAPs */ | |
1349 | ret = -EINVAL; | |
1350 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1351 | break; | |
1352 | ret = -EFAULT; | |
1353 | if (copy_from_user(&fprog, argp, sizeof(fprog))) | |
1354 | break; | |
1355 | ||
1356 | ret = sk_attach_filter(&fprog, tun->socket.sk); | |
1357 | break; | |
1358 | ||
1359 | case TUNDETACHFILTER: | |
1360 | /* Can be set only for TAPs */ | |
1361 | ret = -EINVAL; | |
1362 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1363 | break; | |
1364 | ret = sk_detach_filter(tun->socket.sk); | |
1365 | break; | |
1366 | ||
1da177e4 | 1367 | default: |
631ab46b EB |
1368 | ret = -EINVAL; |
1369 | break; | |
ee289b64 | 1370 | } |
1da177e4 | 1371 | |
876bfd4d HX |
1372 | unlock: |
1373 | rtnl_unlock(); | |
1374 | if (tun) | |
1375 | tun_put(tun); | |
631ab46b | 1376 | return ret; |
1da177e4 LT |
1377 | } |
1378 | ||
50857e2a AB |
1379 | static long tun_chr_ioctl(struct file *file, |
1380 | unsigned int cmd, unsigned long arg) | |
1381 | { | |
1382 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
1383 | } | |
1384 | ||
1385 | #ifdef CONFIG_COMPAT | |
1386 | static long tun_chr_compat_ioctl(struct file *file, | |
1387 | unsigned int cmd, unsigned long arg) | |
1388 | { | |
1389 | switch (cmd) { | |
1390 | case TUNSETIFF: | |
1391 | case TUNGETIFF: | |
1392 | case TUNSETTXFILTER: | |
1393 | case TUNGETSNDBUF: | |
1394 | case TUNSETSNDBUF: | |
1395 | case SIOCGIFHWADDR: | |
1396 | case SIOCSIFHWADDR: | |
1397 | arg = (unsigned long)compat_ptr(arg); | |
1398 | break; | |
1399 | default: | |
1400 | arg = (compat_ulong_t)arg; | |
1401 | break; | |
1402 | } | |
1403 | ||
1404 | /* | |
1405 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
1406 | * the end of that structure. All fields that are used in this | |
1407 | * driver are compatible though, we don't need to convert the | |
1408 | * contents. | |
1409 | */ | |
1410 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
1411 | } | |
1412 | #endif /* CONFIG_COMPAT */ | |
1413 | ||
1da177e4 LT |
1414 | static int tun_chr_fasync(int fd, struct file *file, int on) |
1415 | { | |
631ab46b | 1416 | struct tun_struct *tun = tun_get(file); |
1da177e4 LT |
1417 | int ret; |
1418 | ||
1419 | if (!tun) | |
1420 | return -EBADFD; | |
1421 | ||
1422 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
1423 | ||
1424 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
9d319522 | 1425 | goto out; |
6aa20a22 | 1426 | |
1da177e4 | 1427 | if (on) { |
609d7fa9 | 1428 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 1429 | if (ret) |
9d319522 | 1430 | goto out; |
1da177e4 | 1431 | tun->flags |= TUN_FASYNC; |
6aa20a22 | 1432 | } else |
1da177e4 | 1433 | tun->flags &= ~TUN_FASYNC; |
9d319522 JC |
1434 | ret = 0; |
1435 | out: | |
631ab46b | 1436 | tun_put(tun); |
9d319522 | 1437 | return ret; |
1da177e4 LT |
1438 | } |
1439 | ||
1440 | static int tun_chr_open(struct inode *inode, struct file * file) | |
1441 | { | |
631ab46b | 1442 | struct tun_file *tfile; |
deed49fb | 1443 | |
1da177e4 | 1444 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); |
631ab46b EB |
1445 | |
1446 | tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); | |
1447 | if (!tfile) | |
1448 | return -ENOMEM; | |
c70f1829 | 1449 | atomic_set(&tfile->count, 0); |
631ab46b | 1450 | tfile->tun = NULL; |
36b50bab | 1451 | tfile->net = get_net(current->nsproxy->net_ns); |
631ab46b | 1452 | file->private_data = tfile; |
1da177e4 LT |
1453 | return 0; |
1454 | } | |
1455 | ||
1456 | static int tun_chr_close(struct inode *inode, struct file *file) | |
1457 | { | |
631ab46b | 1458 | struct tun_file *tfile = file->private_data; |
f0a4d0e5 | 1459 | struct tun_struct *tun; |
1da177e4 | 1460 | |
f0a4d0e5 | 1461 | tun = __tun_get(tfile); |
631ab46b | 1462 | if (tun) { |
d23e4365 HX |
1463 | struct net_device *dev = tun->dev; |
1464 | ||
1465 | DBG(KERN_INFO "%s: tun_chr_close\n", dev->name); | |
1da177e4 | 1466 | |
631ab46b | 1467 | __tun_detach(tun); |
1da177e4 | 1468 | |
3ad2f3fb | 1469 | /* If desirable, unregister the netdevice. */ |
d23e4365 HX |
1470 | if (!(tun->flags & TUN_PERSIST)) { |
1471 | rtnl_lock(); | |
1472 | if (dev->reg_state == NETREG_REGISTERED) | |
1473 | unregister_netdevice(dev); | |
1474 | rtnl_unlock(); | |
1475 | } | |
631ab46b | 1476 | } |
1da177e4 | 1477 | |
9c3fea6a HX |
1478 | tun = tfile->tun; |
1479 | if (tun) | |
89f56d1e | 1480 | sock_put(tun->socket.sk); |
9c3fea6a | 1481 | |
36b50bab | 1482 | put_net(tfile->net); |
631ab46b | 1483 | kfree(tfile); |
1da177e4 LT |
1484 | |
1485 | return 0; | |
1486 | } | |
1487 | ||
d54b1fdb | 1488 | static const struct file_operations tun_fops = { |
6aa20a22 | 1489 | .owner = THIS_MODULE, |
1da177e4 | 1490 | .llseek = no_llseek, |
ee0b3e67 BP |
1491 | .read = do_sync_read, |
1492 | .aio_read = tun_chr_aio_read, | |
1493 | .write = do_sync_write, | |
1494 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 1495 | .poll = tun_chr_poll, |
50857e2a AB |
1496 | .unlocked_ioctl = tun_chr_ioctl, |
1497 | #ifdef CONFIG_COMPAT | |
1498 | .compat_ioctl = tun_chr_compat_ioctl, | |
1499 | #endif | |
1da177e4 LT |
1500 | .open = tun_chr_open, |
1501 | .release = tun_chr_close, | |
6aa20a22 | 1502 | .fasync = tun_chr_fasync |
1da177e4 LT |
1503 | }; |
1504 | ||
1505 | static struct miscdevice tun_miscdev = { | |
1506 | .minor = TUN_MINOR, | |
1507 | .name = "tun", | |
e454cea2 | 1508 | .nodename = "net/tun", |
1da177e4 | 1509 | .fops = &tun_fops, |
1da177e4 LT |
1510 | }; |
1511 | ||
1512 | /* ethtool interface */ | |
1513 | ||
1514 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1515 | { | |
1516 | cmd->supported = 0; | |
1517 | cmd->advertising = 0; | |
1518 | cmd->speed = SPEED_10; | |
1519 | cmd->duplex = DUPLEX_FULL; | |
1520 | cmd->port = PORT_TP; | |
1521 | cmd->phy_address = 0; | |
1522 | cmd->transceiver = XCVR_INTERNAL; | |
1523 | cmd->autoneg = AUTONEG_DISABLE; | |
1524 | cmd->maxtxpkt = 0; | |
1525 | cmd->maxrxpkt = 0; | |
1526 | return 0; | |
1527 | } | |
1528 | ||
1529 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
1530 | { | |
1531 | struct tun_struct *tun = netdev_priv(dev); | |
1532 | ||
1533 | strcpy(info->driver, DRV_NAME); | |
1534 | strcpy(info->version, DRV_VERSION); | |
1535 | strcpy(info->fw_version, "N/A"); | |
1536 | ||
1537 | switch (tun->flags & TUN_TYPE_MASK) { | |
1538 | case TUN_TUN_DEV: | |
1539 | strcpy(info->bus_info, "tun"); | |
1540 | break; | |
1541 | case TUN_TAP_DEV: | |
1542 | strcpy(info->bus_info, "tap"); | |
1543 | break; | |
1544 | } | |
1545 | } | |
1546 | ||
1547 | static u32 tun_get_msglevel(struct net_device *dev) | |
1548 | { | |
1549 | #ifdef TUN_DEBUG | |
1550 | struct tun_struct *tun = netdev_priv(dev); | |
1551 | return tun->debug; | |
1552 | #else | |
1553 | return -EOPNOTSUPP; | |
1554 | #endif | |
1555 | } | |
1556 | ||
1557 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
1558 | { | |
1559 | #ifdef TUN_DEBUG | |
1560 | struct tun_struct *tun = netdev_priv(dev); | |
1561 | tun->debug = value; | |
1562 | #endif | |
1563 | } | |
1564 | ||
1565 | static u32 tun_get_link(struct net_device *dev) | |
1566 | { | |
1567 | struct tun_struct *tun = netdev_priv(dev); | |
631ab46b | 1568 | return !!tun->tfile; |
1da177e4 LT |
1569 | } |
1570 | ||
1571 | static u32 tun_get_rx_csum(struct net_device *dev) | |
1572 | { | |
1573 | struct tun_struct *tun = netdev_priv(dev); | |
1574 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
1575 | } | |
1576 | ||
1577 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
1578 | { | |
1579 | struct tun_struct *tun = netdev_priv(dev); | |
1580 | if (data) | |
1581 | tun->flags &= ~TUN_NOCHECKSUM; | |
1582 | else | |
1583 | tun->flags |= TUN_NOCHECKSUM; | |
1584 | return 0; | |
1585 | } | |
1586 | ||
7282d491 | 1587 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
1588 | .get_settings = tun_get_settings, |
1589 | .get_drvinfo = tun_get_drvinfo, | |
1590 | .get_msglevel = tun_get_msglevel, | |
1591 | .set_msglevel = tun_set_msglevel, | |
1592 | .get_link = tun_get_link, | |
1593 | .get_rx_csum = tun_get_rx_csum, | |
1594 | .set_rx_csum = tun_set_rx_csum | |
1595 | }; | |
1596 | ||
79d17604 | 1597 | |
1da177e4 LT |
1598 | static int __init tun_init(void) |
1599 | { | |
1600 | int ret = 0; | |
1601 | ||
1602 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
1603 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
1604 | ||
f019a7a5 | 1605 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 1606 | if (ret) { |
f019a7a5 EB |
1607 | printk(KERN_ERR "tun: Can't register link_ops\n"); |
1608 | goto err_linkops; | |
79d17604 PE |
1609 | } |
1610 | ||
1da177e4 | 1611 | ret = misc_register(&tun_miscdev); |
79d17604 | 1612 | if (ret) { |
1da177e4 | 1613 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
1614 | goto err_misc; |
1615 | } | |
f019a7a5 | 1616 | return 0; |
79d17604 | 1617 | err_misc: |
f019a7a5 EB |
1618 | rtnl_link_unregister(&tun_link_ops); |
1619 | err_linkops: | |
1da177e4 LT |
1620 | return ret; |
1621 | } | |
1622 | ||
1623 | static void tun_cleanup(void) | |
1624 | { | |
6aa20a22 | 1625 | misc_deregister(&tun_miscdev); |
f019a7a5 | 1626 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
1627 | } |
1628 | ||
05c2828c MT |
1629 | /* Get an underlying socket object from tun file. Returns error unless file is |
1630 | * attached to a device. The returned object works like a packet socket, it | |
1631 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
1632 | * holding a reference to the file for as long as the socket is in use. */ | |
1633 | struct socket *tun_get_socket(struct file *file) | |
1634 | { | |
1635 | struct tun_struct *tun; | |
1636 | if (file->f_op != &tun_fops) | |
1637 | return ERR_PTR(-EINVAL); | |
1638 | tun = tun_get(file); | |
1639 | if (!tun) | |
1640 | return ERR_PTR(-EBADFD); | |
1641 | tun_put(tun); | |
1642 | return &tun->socket; | |
1643 | } | |
1644 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
1645 | ||
1da177e4 LT |
1646 | module_init(tun_init); |
1647 | module_exit(tun_cleanup); | |
1648 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1649 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1650 | MODULE_LICENSE("GPL"); | |
1651 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |