Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * TUN - Universal TUN/TAP device driver. | |
3 | * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Changes: | |
20 | * | |
ff4cc3ac MK |
21 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
22 | * Add TUNSETLINK ioctl to set the link encapsulation | |
23 | * | |
1da177e4 | 24 | * Mark Smith <markzzzsmith@yahoo.com.au> |
f271b2cc | 25 | * Use random_ether_addr() for tap MAC address. |
1da177e4 LT |
26 | * |
27 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 | |
28 | * Fixes in packet dropping, queue length setting and queue wakeup. | |
29 | * Increased default tx queue length. | |
30 | * Added ethtool API. | |
31 | * Minor cleanups | |
32 | * | |
33 | * Daniel Podlejski <underley@underley.eu.org> | |
34 | * Modifications for 2.3.99-pre5 kernel. | |
35 | */ | |
36 | ||
37 | #define DRV_NAME "tun" | |
38 | #define DRV_VERSION "1.6" | |
39 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
40 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
41 | ||
1da177e4 LT |
42 | #include <linux/module.h> |
43 | #include <linux/errno.h> | |
44 | #include <linux/kernel.h> | |
45 | #include <linux/major.h> | |
46 | #include <linux/slab.h> | |
47 | #include <linux/poll.h> | |
48 | #include <linux/fcntl.h> | |
49 | #include <linux/init.h> | |
50 | #include <linux/skbuff.h> | |
51 | #include <linux/netdevice.h> | |
52 | #include <linux/etherdevice.h> | |
53 | #include <linux/miscdevice.h> | |
54 | #include <linux/ethtool.h> | |
55 | #include <linux/rtnetlink.h> | |
50857e2a | 56 | #include <linux/compat.h> |
1da177e4 LT |
57 | #include <linux/if.h> |
58 | #include <linux/if_arp.h> | |
59 | #include <linux/if_ether.h> | |
60 | #include <linux/if_tun.h> | |
61 | #include <linux/crc32.h> | |
d647a591 | 62 | #include <linux/nsproxy.h> |
f43798c2 | 63 | #include <linux/virtio_net.h> |
99405162 | 64 | #include <linux/rcupdate.h> |
881d966b | 65 | #include <net/net_namespace.h> |
79d17604 | 66 | #include <net/netns/generic.h> |
f019a7a5 | 67 | #include <net/rtnetlink.h> |
33dccbb0 | 68 | #include <net/sock.h> |
1da177e4 LT |
69 | |
70 | #include <asm/system.h> | |
71 | #include <asm/uaccess.h> | |
72 | ||
14daa021 RR |
73 | /* Uncomment to enable debugging */ |
74 | /* #define TUN_DEBUG 1 */ | |
75 | ||
1da177e4 LT |
76 | #ifdef TUN_DEBUG |
77 | static int debug; | |
14daa021 RR |
78 | |
79 | #define DBG if(tun->debug)printk | |
80 | #define DBG1 if(debug==2)printk | |
81 | #else | |
82 | #define DBG( a... ) | |
83 | #define DBG1( a... ) | |
84 | #endif | |
85 | ||
f271b2cc MK |
86 | #define FLT_EXACT_COUNT 8 |
87 | struct tap_filter { | |
88 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
89 | u32 mask[2]; /* Mask of the hashed addrs */ | |
90 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
91 | }; | |
92 | ||
631ab46b | 93 | struct tun_file { |
c70f1829 | 94 | atomic_t count; |
631ab46b | 95 | struct tun_struct *tun; |
36b50bab | 96 | struct net *net; |
631ab46b EB |
97 | }; |
98 | ||
33dccbb0 HX |
99 | struct tun_sock; |
100 | ||
14daa021 | 101 | struct tun_struct { |
631ab46b | 102 | struct tun_file *tfile; |
f271b2cc | 103 | unsigned int flags; |
14daa021 RR |
104 | uid_t owner; |
105 | gid_t group; | |
106 | ||
14daa021 | 107 | struct net_device *dev; |
f271b2cc | 108 | struct fasync_struct *fasync; |
14daa021 | 109 | |
f271b2cc | 110 | struct tap_filter txflt; |
33dccbb0 | 111 | struct socket socket; |
43815482 | 112 | struct socket_wq wq; |
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; |
bee31369 | 152 | netif_carrier_on(tun->dev); |
c70f1829 | 153 | dev_hold(tun->dev); |
89f56d1e | 154 | sock_hold(tun->socket.sk); |
c70f1829 | 155 | atomic_inc(&tfile->count); |
a7385ba2 | 156 | |
38231b7a EB |
157 | out: |
158 | netif_tx_unlock_bh(tun->dev); | |
159 | return err; | |
a7385ba2 EB |
160 | } |
161 | ||
631ab46b EB |
162 | static void __tun_detach(struct tun_struct *tun) |
163 | { | |
631ab46b | 164 | /* Detach from net device */ |
38231b7a | 165 | netif_tx_lock_bh(tun->dev); |
bee31369 | 166 | netif_carrier_off(tun->dev); |
631ab46b | 167 | tun->tfile = NULL; |
05c2828c | 168 | tun->socket.file = NULL; |
38231b7a | 169 | netif_tx_unlock_bh(tun->dev); |
631ab46b EB |
170 | |
171 | /* Drop read queue */ | |
89f56d1e | 172 | skb_queue_purge(&tun->socket.sk->sk_receive_queue); |
c70f1829 EB |
173 | |
174 | /* Drop the extra count on the net device */ | |
175 | dev_put(tun->dev); | |
176 | } | |
177 | ||
178 | static void tun_detach(struct tun_struct *tun) | |
179 | { | |
180 | rtnl_lock(); | |
181 | __tun_detach(tun); | |
182 | rtnl_unlock(); | |
631ab46b EB |
183 | } |
184 | ||
185 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
186 | { | |
c70f1829 EB |
187 | struct tun_struct *tun = NULL; |
188 | ||
189 | if (atomic_inc_not_zero(&tfile->count)) | |
190 | tun = tfile->tun; | |
191 | ||
192 | return tun; | |
631ab46b EB |
193 | } |
194 | ||
195 | static struct tun_struct *tun_get(struct file *file) | |
196 | { | |
197 | return __tun_get(file->private_data); | |
198 | } | |
199 | ||
200 | static void tun_put(struct tun_struct *tun) | |
201 | { | |
c70f1829 EB |
202 | struct tun_file *tfile = tun->tfile; |
203 | ||
204 | if (atomic_dec_and_test(&tfile->count)) | |
205 | tun_detach(tfile->tun); | |
631ab46b EB |
206 | } |
207 | ||
f271b2cc MK |
208 | /* TAP filterting */ |
209 | static void addr_hash_set(u32 *mask, const u8 *addr) | |
210 | { | |
211 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
212 | mask[n >> 5] |= (1 << (n & 31)); | |
213 | } | |
214 | ||
215 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
216 | { | |
217 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
218 | return mask[n >> 5] & (1 << (n & 31)); | |
219 | } | |
220 | ||
221 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
222 | { | |
223 | struct { u8 u[ETH_ALEN]; } *addr; | |
224 | struct tun_filter uf; | |
225 | int err, alen, n, nexact; | |
226 | ||
227 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
228 | return -EFAULT; | |
229 | ||
230 | if (!uf.count) { | |
231 | /* Disabled */ | |
232 | filter->count = 0; | |
233 | return 0; | |
234 | } | |
235 | ||
236 | alen = ETH_ALEN * uf.count; | |
237 | addr = kmalloc(alen, GFP_KERNEL); | |
238 | if (!addr) | |
239 | return -ENOMEM; | |
240 | ||
241 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
242 | err = -EFAULT; | |
243 | goto done; | |
244 | } | |
245 | ||
246 | /* The filter is updated without holding any locks. Which is | |
247 | * perfectly safe. We disable it first and in the worst | |
248 | * case we'll accept a few undesired packets. */ | |
249 | filter->count = 0; | |
250 | wmb(); | |
251 | ||
252 | /* Use first set of addresses as an exact filter */ | |
253 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
254 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
255 | ||
256 | nexact = n; | |
257 | ||
cfbf84fc AW |
258 | /* Remaining multicast addresses are hashed, |
259 | * unicast will leave the filter disabled. */ | |
f271b2cc | 260 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
261 | for (; n < uf.count; n++) { |
262 | if (!is_multicast_ether_addr(addr[n].u)) { | |
263 | err = 0; /* no filter */ | |
264 | goto done; | |
265 | } | |
f271b2cc | 266 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 267 | } |
f271b2cc MK |
268 | |
269 | /* For ALLMULTI just set the mask to all ones. | |
270 | * This overrides the mask populated above. */ | |
271 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
272 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
273 | ||
274 | /* Now enable the filter */ | |
275 | wmb(); | |
276 | filter->count = nexact; | |
277 | ||
278 | /* Return the number of exact filters */ | |
279 | err = nexact; | |
280 | ||
281 | done: | |
282 | kfree(addr); | |
283 | return err; | |
284 | } | |
285 | ||
286 | /* Returns: 0 - drop, !=0 - accept */ | |
287 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
288 | { | |
289 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
290 | * at this point. */ | |
291 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
292 | int i; | |
293 | ||
294 | /* Exact match */ | |
295 | for (i = 0; i < filter->count; i++) | |
296 | if (!compare_ether_addr(eh->h_dest, filter->addr[i])) | |
297 | return 1; | |
298 | ||
299 | /* Inexact match (multicast only) */ | |
300 | if (is_multicast_ether_addr(eh->h_dest)) | |
301 | return addr_hash_test(filter->mask, eh->h_dest); | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | /* | |
307 | * Checks whether the packet is accepted or not. | |
308 | * Returns: 0 - drop, !=0 - accept | |
309 | */ | |
310 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
311 | { | |
312 | if (!filter->count) | |
313 | return 1; | |
314 | ||
315 | return run_filter(filter, skb); | |
316 | } | |
317 | ||
1da177e4 LT |
318 | /* Network device part of the driver */ |
319 | ||
7282d491 | 320 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 321 | |
c70f1829 EB |
322 | /* Net device detach from fd. */ |
323 | static void tun_net_uninit(struct net_device *dev) | |
324 | { | |
325 | struct tun_struct *tun = netdev_priv(dev); | |
326 | struct tun_file *tfile = tun->tfile; | |
327 | ||
328 | /* Inform the methods they need to stop using the dev. | |
329 | */ | |
330 | if (tfile) { | |
43815482 | 331 | wake_up_all(&tun->wq.wait); |
c70f1829 EB |
332 | if (atomic_dec_and_test(&tfile->count)) |
333 | __tun_detach(tun); | |
334 | } | |
335 | } | |
336 | ||
9c3fea6a HX |
337 | static void tun_free_netdev(struct net_device *dev) |
338 | { | |
339 | struct tun_struct *tun = netdev_priv(dev); | |
340 | ||
89f56d1e | 341 | sock_put(tun->socket.sk); |
9c3fea6a HX |
342 | } |
343 | ||
1da177e4 LT |
344 | /* Net device open. */ |
345 | static int tun_net_open(struct net_device *dev) | |
346 | { | |
347 | netif_start_queue(dev); | |
348 | return 0; | |
349 | } | |
350 | ||
351 | /* Net device close. */ | |
352 | static int tun_net_close(struct net_device *dev) | |
353 | { | |
354 | netif_stop_queue(dev); | |
355 | return 0; | |
356 | } | |
357 | ||
358 | /* Net device start xmit */ | |
424efe9c | 359 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
360 | { |
361 | struct tun_struct *tun = netdev_priv(dev); | |
362 | ||
363 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); | |
364 | ||
365 | /* Drop packet if interface is not attached */ | |
631ab46b | 366 | if (!tun->tfile) |
1da177e4 LT |
367 | goto drop; |
368 | ||
f271b2cc MK |
369 | /* Drop if the filter does not like it. |
370 | * This is a noop if the filter is disabled. | |
371 | * Filter can be enabled only for the TAP devices. */ | |
372 | if (!check_filter(&tun->txflt, skb)) | |
373 | goto drop; | |
374 | ||
99405162 MT |
375 | if (tun->socket.sk->sk_filter && |
376 | sk_filter(tun->socket.sk, skb)) | |
377 | goto drop; | |
378 | ||
89f56d1e | 379 | if (skb_queue_len(&tun->socket.sk->sk_receive_queue) >= dev->tx_queue_len) { |
1da177e4 LT |
380 | if (!(tun->flags & TUN_ONE_QUEUE)) { |
381 | /* Normal queueing mode. */ | |
382 | /* Packet scheduler handles dropping of further packets. */ | |
383 | netif_stop_queue(dev); | |
384 | ||
385 | /* We won't see all dropped packets individually, so overrun | |
386 | * error is more appropriate. */ | |
09f75cd7 | 387 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
388 | } else { |
389 | /* Single queue mode. | |
390 | * Driver handles dropping of all packets itself. */ | |
391 | goto drop; | |
392 | } | |
393 | } | |
394 | ||
0110d6f2 MT |
395 | /* Orphan the skb - required as we might hang on to it |
396 | * for indefinite time. */ | |
397 | skb_orphan(skb); | |
398 | ||
f271b2cc | 399 | /* Enqueue packet */ |
89f56d1e | 400 | skb_queue_tail(&tun->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
401 | |
402 | /* Notify and wake up reader process */ | |
403 | if (tun->flags & TUN_FASYNC) | |
404 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
43815482 | 405 | wake_up_interruptible_poll(&tun->wq.wait, POLLIN | |
05c2828c | 406 | POLLRDNORM | POLLRDBAND); |
6ed10654 | 407 | return NETDEV_TX_OK; |
1da177e4 LT |
408 | |
409 | drop: | |
09f75cd7 | 410 | dev->stats.tx_dropped++; |
1da177e4 | 411 | kfree_skb(skb); |
6ed10654 | 412 | return NETDEV_TX_OK; |
1da177e4 LT |
413 | } |
414 | ||
f271b2cc | 415 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 416 | { |
f271b2cc MK |
417 | /* |
418 | * This callback is supposed to deal with mc filter in | |
419 | * _rx_ path and has nothing to do with the _tx_ path. | |
420 | * In rx path we always accept everything userspace gives us. | |
421 | */ | |
1da177e4 LT |
422 | } |
423 | ||
4885a504 ES |
424 | #define MIN_MTU 68 |
425 | #define MAX_MTU 65535 | |
426 | ||
427 | static int | |
428 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
429 | { | |
430 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
431 | return -EINVAL; | |
432 | dev->mtu = new_mtu; | |
433 | return 0; | |
434 | } | |
435 | ||
758e43b7 | 436 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 437 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
438 | .ndo_open = tun_net_open, |
439 | .ndo_stop = tun_net_close, | |
00829823 | 440 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 441 | .ndo_change_mtu = tun_net_change_mtu, |
758e43b7 SH |
442 | }; |
443 | ||
444 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 445 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
446 | .ndo_open = tun_net_open, |
447 | .ndo_stop = tun_net_close, | |
00829823 | 448 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 SH |
449 | .ndo_change_mtu = tun_net_change_mtu, |
450 | .ndo_set_multicast_list = tun_net_mclist, | |
451 | .ndo_set_mac_address = eth_mac_addr, | |
452 | .ndo_validate_addr = eth_validate_addr, | |
453 | }; | |
454 | ||
1da177e4 LT |
455 | /* Initialize net device. */ |
456 | static void tun_net_init(struct net_device *dev) | |
457 | { | |
458 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 459 | |
1da177e4 LT |
460 | switch (tun->flags & TUN_TYPE_MASK) { |
461 | case TUN_TUN_DEV: | |
758e43b7 SH |
462 | dev->netdev_ops = &tun_netdev_ops; |
463 | ||
1da177e4 LT |
464 | /* Point-to-Point TUN Device */ |
465 | dev->hard_header_len = 0; | |
466 | dev->addr_len = 0; | |
467 | dev->mtu = 1500; | |
468 | ||
469 | /* Zero header length */ | |
6aa20a22 | 470 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
471 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
472 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
473 | break; | |
474 | ||
475 | case TUN_TAP_DEV: | |
7a0a9608 | 476 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 477 | /* Ethernet TAP Device */ |
1da177e4 | 478 | ether_setup(dev); |
36226a8d | 479 | |
f271b2cc | 480 | random_ether_addr(dev->dev_addr); |
36226a8d | 481 | |
1da177e4 LT |
482 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
483 | break; | |
484 | } | |
485 | } | |
486 | ||
487 | /* Character device part */ | |
488 | ||
489 | /* Poll */ | |
490 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 491 | { |
b2430de3 EB |
492 | struct tun_file *tfile = file->private_data; |
493 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 494 | struct sock *sk; |
33dccbb0 | 495 | unsigned int mask = 0; |
1da177e4 LT |
496 | |
497 | if (!tun) | |
eac9e902 | 498 | return POLLERR; |
1da177e4 | 499 | |
89f56d1e | 500 | sk = tun->socket.sk; |
3c8a9c63 | 501 | |
1da177e4 LT |
502 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); |
503 | ||
43815482 | 504 | poll_wait(file, &tun->wq.wait, wait); |
6aa20a22 | 505 | |
89f56d1e | 506 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
507 | mask |= POLLIN | POLLRDNORM; |
508 | ||
33dccbb0 HX |
509 | if (sock_writeable(sk) || |
510 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
511 | sock_writeable(sk))) | |
512 | mask |= POLLOUT | POLLWRNORM; | |
513 | ||
c70f1829 EB |
514 | if (tun->dev->reg_state != NETREG_REGISTERED) |
515 | mask = POLLERR; | |
516 | ||
631ab46b | 517 | tun_put(tun); |
1da177e4 LT |
518 | return mask; |
519 | } | |
520 | ||
f42157cb RR |
521 | /* prepad is the amount to reserve at front. len is length after that. |
522 | * linear is a hint as to how much to copy (usually headers). */ | |
33dccbb0 HX |
523 | static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun, |
524 | size_t prepad, size_t len, | |
525 | size_t linear, int noblock) | |
f42157cb | 526 | { |
89f56d1e | 527 | struct sock *sk = tun->socket.sk; |
f42157cb | 528 | struct sk_buff *skb; |
33dccbb0 | 529 | int err; |
f42157cb | 530 | |
82862742 HX |
531 | sock_update_classid(sk); |
532 | ||
f42157cb | 533 | /* Under a page? Don't bother with paged skb. */ |
0eca93bc | 534 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 535 | linear = len; |
f42157cb | 536 | |
33dccbb0 HX |
537 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
538 | &err); | |
f42157cb | 539 | if (!skb) |
33dccbb0 | 540 | return ERR_PTR(err); |
f42157cb RR |
541 | |
542 | skb_reserve(skb, prepad); | |
543 | skb_put(skb, linear); | |
33dccbb0 HX |
544 | skb->data_len = len - linear; |
545 | skb->len += len - linear; | |
f42157cb RR |
546 | |
547 | return skb; | |
548 | } | |
549 | ||
1da177e4 | 550 | /* Get packet from user space buffer */ |
33dccbb0 | 551 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, |
6f26c9a7 | 552 | const struct iovec *iv, size_t count, |
33dccbb0 | 553 | int noblock) |
1da177e4 | 554 | { |
09640e63 | 555 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 LT |
556 | struct sk_buff *skb; |
557 | size_t len = count, align = 0; | |
f43798c2 | 558 | struct virtio_net_hdr gso = { 0 }; |
6f26c9a7 | 559 | int offset = 0; |
1da177e4 LT |
560 | |
561 | if (!(tun->flags & TUN_NO_PI)) { | |
562 | if ((len -= sizeof(pi)) > count) | |
563 | return -EINVAL; | |
564 | ||
6f26c9a7 | 565 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 566 | return -EFAULT; |
6f26c9a7 | 567 | offset += sizeof(pi); |
1da177e4 LT |
568 | } |
569 | ||
f43798c2 | 570 | if (tun->flags & TUN_VNET_HDR) { |
d9d52b51 | 571 | if ((len -= tun->vnet_hdr_sz) > count) |
f43798c2 RR |
572 | return -EINVAL; |
573 | ||
6f26c9a7 | 574 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
575 | return -EFAULT; |
576 | ||
4909122f HX |
577 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
578 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
579 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
580 | ||
f43798c2 RR |
581 | if (gso.hdr_len > len) |
582 | return -EINVAL; | |
d9d52b51 | 583 | offset += tun->vnet_hdr_sz; |
f43798c2 RR |
584 | } |
585 | ||
e01bf1c8 | 586 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
1da177e4 | 587 | align = NET_IP_ALIGN; |
0eca93bc HX |
588 | if (unlikely(len < ETH_HLEN || |
589 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
590 | return -EINVAL; |
591 | } | |
6aa20a22 | 592 | |
33dccbb0 HX |
593 | skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock); |
594 | if (IS_ERR(skb)) { | |
595 | if (PTR_ERR(skb) != -EAGAIN) | |
596 | tun->dev->stats.rx_dropped++; | |
597 | return PTR_ERR(skb); | |
1da177e4 LT |
598 | } |
599 | ||
6f26c9a7 | 600 | if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) { |
09f75cd7 | 601 | tun->dev->stats.rx_dropped++; |
8f22757e | 602 | kfree_skb(skb); |
1da177e4 | 603 | return -EFAULT; |
8f22757e | 604 | } |
1da177e4 | 605 | |
f43798c2 RR |
606 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
607 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
608 | gso.csum_offset)) { | |
609 | tun->dev->stats.rx_frame_errors++; | |
610 | kfree_skb(skb); | |
611 | return -EINVAL; | |
612 | } | |
613 | } else if (tun->flags & TUN_NOCHECKSUM) | |
614 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
615 | ||
1da177e4 LT |
616 | switch (tun->flags & TUN_TYPE_MASK) { |
617 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
618 | if (tun->flags & TUN_NO_PI) { |
619 | switch (skb->data[0] & 0xf0) { | |
620 | case 0x40: | |
621 | pi.proto = htons(ETH_P_IP); | |
622 | break; | |
623 | case 0x60: | |
624 | pi.proto = htons(ETH_P_IPV6); | |
625 | break; | |
626 | default: | |
627 | tun->dev->stats.rx_dropped++; | |
628 | kfree_skb(skb); | |
629 | return -EINVAL; | |
630 | } | |
631 | } | |
632 | ||
459a98ed | 633 | skb_reset_mac_header(skb); |
1da177e4 | 634 | skb->protocol = pi.proto; |
4c13eb66 | 635 | skb->dev = tun->dev; |
1da177e4 LT |
636 | break; |
637 | case TUN_TAP_DEV: | |
638 | skb->protocol = eth_type_trans(skb, tun->dev); | |
639 | break; | |
640 | }; | |
641 | ||
f43798c2 RR |
642 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
643 | pr_debug("GSO!\n"); | |
644 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
645 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
646 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
647 | break; | |
648 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
649 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
650 | break; | |
e36aa25a SS |
651 | case VIRTIO_NET_HDR_GSO_UDP: |
652 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
653 | break; | |
f43798c2 RR |
654 | default: |
655 | tun->dev->stats.rx_frame_errors++; | |
656 | kfree_skb(skb); | |
657 | return -EINVAL; | |
658 | } | |
659 | ||
660 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
661 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
662 | ||
663 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
664 | if (skb_shinfo(skb)->gso_size == 0) { | |
665 | tun->dev->stats.rx_frame_errors++; | |
666 | kfree_skb(skb); | |
667 | return -EINVAL; | |
668 | } | |
669 | ||
670 | /* Header must be checked, and gso_segs computed. */ | |
671 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
672 | skb_shinfo(skb)->gso_segs = 0; | |
673 | } | |
6aa20a22 | 674 | |
1da177e4 | 675 | netif_rx_ni(skb); |
6aa20a22 | 676 | |
09f75cd7 JG |
677 | tun->dev->stats.rx_packets++; |
678 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
679 | |
680 | return count; | |
6aa20a22 | 681 | } |
1da177e4 | 682 | |
ee0b3e67 BP |
683 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
684 | unsigned long count, loff_t pos) | |
1da177e4 | 685 | { |
33dccbb0 | 686 | struct file *file = iocb->ki_filp; |
ab46d779 | 687 | struct tun_struct *tun = tun_get(file); |
631ab46b | 688 | ssize_t result; |
1da177e4 LT |
689 | |
690 | if (!tun) | |
691 | return -EBADFD; | |
692 | ||
693 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
694 | ||
6f26c9a7 | 695 | result = tun_get_user(tun, iv, iov_length(iv, count), |
33dccbb0 | 696 | file->f_flags & O_NONBLOCK); |
631ab46b EB |
697 | |
698 | tun_put(tun); | |
699 | return result; | |
1da177e4 LT |
700 | } |
701 | ||
1da177e4 LT |
702 | /* Put packet to the user space buffer */ |
703 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
704 | struct sk_buff *skb, | |
43b39dcd | 705 | const struct iovec *iv, int len) |
1da177e4 LT |
706 | { |
707 | struct tun_pi pi = { 0, skb->protocol }; | |
708 | ssize_t total = 0; | |
709 | ||
710 | if (!(tun->flags & TUN_NO_PI)) { | |
711 | if ((len -= sizeof(pi)) < 0) | |
712 | return -EINVAL; | |
713 | ||
714 | if (len < skb->len) { | |
715 | /* Packet will be striped */ | |
716 | pi.flags |= TUN_PKT_STRIP; | |
717 | } | |
6aa20a22 | 718 | |
43b39dcd | 719 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
720 | return -EFAULT; |
721 | total += sizeof(pi); | |
6aa20a22 | 722 | } |
1da177e4 | 723 | |
f43798c2 RR |
724 | if (tun->flags & TUN_VNET_HDR) { |
725 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
d9d52b51 | 726 | if ((len -= tun->vnet_hdr_sz) < 0) |
f43798c2 RR |
727 | return -EINVAL; |
728 | ||
729 | if (skb_is_gso(skb)) { | |
730 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
731 | ||
732 | /* This is a hint as to how much should be linear. */ | |
733 | gso.hdr_len = skb_headlen(skb); | |
734 | gso.gso_size = sinfo->gso_size; | |
735 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
736 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
737 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
738 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e36aa25a SS |
739 | else if (sinfo->gso_type & SKB_GSO_UDP) |
740 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
ef3db4a5 MT |
741 | else { |
742 | printk(KERN_ERR "tun: unexpected GSO type: " | |
743 | "0x%x, gso_size %d, hdr_len %d\n", | |
744 | sinfo->gso_type, gso.gso_size, | |
745 | gso.hdr_len); | |
746 | print_hex_dump(KERN_ERR, "tun: ", | |
747 | DUMP_PREFIX_NONE, | |
748 | 16, 1, skb->head, | |
749 | min((int)gso.hdr_len, 64), true); | |
750 | WARN_ON_ONCE(1); | |
751 | return -EINVAL; | |
752 | } | |
f43798c2 RR |
753 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
754 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
755 | } else | |
756 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
757 | ||
758 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
759 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
760 | gso.csum_start = skb->csum_start - skb_headroom(skb); | |
761 | gso.csum_offset = skb->csum_offset; | |
762 | } /* else everything is zero */ | |
763 | ||
43b39dcd MT |
764 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
765 | sizeof(gso)))) | |
f43798c2 | 766 | return -EFAULT; |
d9d52b51 | 767 | total += tun->vnet_hdr_sz; |
f43798c2 RR |
768 | } |
769 | ||
1da177e4 LT |
770 | len = min_t(int, skb->len, len); |
771 | ||
43b39dcd | 772 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
05c2828c | 773 | total += skb->len; |
1da177e4 | 774 | |
09f75cd7 JG |
775 | tun->dev->stats.tx_packets++; |
776 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
777 | |
778 | return total; | |
779 | } | |
780 | ||
05c2828c MT |
781 | static ssize_t tun_do_read(struct tun_struct *tun, |
782 | struct kiocb *iocb, const struct iovec *iv, | |
783 | ssize_t len, int noblock) | |
1da177e4 | 784 | { |
1da177e4 LT |
785 | DECLARE_WAITQUEUE(wait, current); |
786 | struct sk_buff *skb; | |
05c2828c | 787 | ssize_t ret = 0; |
1da177e4 LT |
788 | |
789 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
790 | ||
43815482 | 791 | add_wait_queue(&tun->wq.wait, &wait); |
1da177e4 | 792 | while (len) { |
1da177e4 LT |
793 | current->state = TASK_INTERRUPTIBLE; |
794 | ||
795 | /* Read frames from the queue */ | |
89f56d1e | 796 | if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) { |
05c2828c | 797 | if (noblock) { |
1da177e4 LT |
798 | ret = -EAGAIN; |
799 | break; | |
800 | } | |
801 | if (signal_pending(current)) { | |
802 | ret = -ERESTARTSYS; | |
803 | break; | |
804 | } | |
c70f1829 EB |
805 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
806 | ret = -EIO; | |
807 | break; | |
808 | } | |
1da177e4 LT |
809 | |
810 | /* Nothing to read, let's sleep */ | |
811 | schedule(); | |
812 | continue; | |
813 | } | |
814 | netif_wake_queue(tun->dev); | |
815 | ||
43b39dcd | 816 | ret = tun_put_user(tun, skb, iv, len); |
f271b2cc MK |
817 | kfree_skb(skb); |
818 | break; | |
1da177e4 LT |
819 | } |
820 | ||
821 | current->state = TASK_RUNNING; | |
43815482 | 822 | remove_wait_queue(&tun->wq.wait, &wait); |
1da177e4 | 823 | |
05c2828c MT |
824 | return ret; |
825 | } | |
826 | ||
827 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
828 | unsigned long count, loff_t pos) | |
829 | { | |
830 | struct file *file = iocb->ki_filp; | |
831 | struct tun_file *tfile = file->private_data; | |
832 | struct tun_struct *tun = __tun_get(tfile); | |
833 | ssize_t len, ret; | |
834 | ||
835 | if (!tun) | |
836 | return -EBADFD; | |
837 | len = iov_length(iv, count); | |
838 | if (len < 0) { | |
839 | ret = -EINVAL; | |
840 | goto out; | |
841 | } | |
842 | ||
843 | ret = tun_do_read(tun, iocb, iv, len, file->f_flags & O_NONBLOCK); | |
844 | ret = min_t(ssize_t, ret, len); | |
631ab46b EB |
845 | out: |
846 | tun_put(tun); | |
1da177e4 LT |
847 | return ret; |
848 | } | |
849 | ||
1da177e4 LT |
850 | static void tun_setup(struct net_device *dev) |
851 | { | |
852 | struct tun_struct *tun = netdev_priv(dev); | |
853 | ||
1da177e4 | 854 | tun->owner = -1; |
8c644623 | 855 | tun->group = -1; |
1da177e4 | 856 | |
1da177e4 | 857 | dev->ethtool_ops = &tun_ethtool_ops; |
9c3fea6a | 858 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
859 | } |
860 | ||
f019a7a5 EB |
861 | /* Trivial set of netlink ops to allow deleting tun or tap |
862 | * device with netlink. | |
863 | */ | |
864 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
865 | { | |
866 | return -EINVAL; | |
867 | } | |
868 | ||
869 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
870 | .kind = DRV_NAME, | |
871 | .priv_size = sizeof(struct tun_struct), | |
872 | .setup = tun_setup, | |
873 | .validate = tun_validate, | |
874 | }; | |
875 | ||
33dccbb0 HX |
876 | static void tun_sock_write_space(struct sock *sk) |
877 | { | |
878 | struct tun_struct *tun; | |
43815482 | 879 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
880 | |
881 | if (!sock_writeable(sk)) | |
882 | return; | |
883 | ||
33dccbb0 HX |
884 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
885 | return; | |
886 | ||
43815482 ED |
887 | wqueue = sk_sleep(sk); |
888 | if (wqueue && waitqueue_active(wqueue)) | |
889 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 890 | POLLWRNORM | POLLWRBAND); |
c722c625 | 891 | |
80924e5f | 892 | tun = tun_sk(sk)->tun; |
33dccbb0 HX |
893 | kill_fasync(&tun->fasync, SIGIO, POLL_OUT); |
894 | } | |
895 | ||
896 | static void tun_sock_destruct(struct sock *sk) | |
897 | { | |
80924e5f | 898 | free_netdev(tun_sk(sk)->tun->dev); |
33dccbb0 HX |
899 | } |
900 | ||
05c2828c MT |
901 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
902 | struct msghdr *m, size_t total_len) | |
903 | { | |
904 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
905 | return tun_get_user(tun, m->msg_iov, total_len, | |
906 | m->msg_flags & MSG_DONTWAIT); | |
907 | } | |
908 | ||
909 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, | |
910 | struct msghdr *m, size_t total_len, | |
911 | int flags) | |
912 | { | |
913 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
914 | int ret; | |
915 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) | |
916 | return -EINVAL; | |
917 | ret = tun_do_read(tun, iocb, m->msg_iov, total_len, | |
918 | flags & MSG_DONTWAIT); | |
919 | if (ret > total_len) { | |
920 | m->msg_flags |= MSG_TRUNC; | |
921 | ret = flags & MSG_TRUNC ? ret : total_len; | |
922 | } | |
923 | return ret; | |
924 | } | |
925 | ||
926 | /* Ops structure to mimic raw sockets with tun */ | |
927 | static const struct proto_ops tun_socket_ops = { | |
928 | .sendmsg = tun_sendmsg, | |
929 | .recvmsg = tun_recvmsg, | |
930 | }; | |
931 | ||
33dccbb0 HX |
932 | static struct proto tun_proto = { |
933 | .name = "tun", | |
934 | .owner = THIS_MODULE, | |
935 | .obj_size = sizeof(struct tun_sock), | |
936 | }; | |
f019a7a5 | 937 | |
980c9e8c DW |
938 | static int tun_flags(struct tun_struct *tun) |
939 | { | |
940 | int flags = 0; | |
941 | ||
942 | if (tun->flags & TUN_TUN_DEV) | |
943 | flags |= IFF_TUN; | |
944 | else | |
945 | flags |= IFF_TAP; | |
946 | ||
947 | if (tun->flags & TUN_NO_PI) | |
948 | flags |= IFF_NO_PI; | |
949 | ||
950 | if (tun->flags & TUN_ONE_QUEUE) | |
951 | flags |= IFF_ONE_QUEUE; | |
952 | ||
953 | if (tun->flags & TUN_VNET_HDR) | |
954 | flags |= IFF_VNET_HDR; | |
955 | ||
956 | return flags; | |
957 | } | |
958 | ||
959 | static ssize_t tun_show_flags(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, "0x%x\n", tun_flags(tun)); | |
964 | } | |
965 | ||
966 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
967 | char *buf) | |
968 | { | |
969 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
970 | return sprintf(buf, "%d\n", tun->owner); | |
971 | } | |
972 | ||
973 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
974 | char *buf) | |
975 | { | |
976 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
977 | return sprintf(buf, "%d\n", tun->group); | |
978 | } | |
979 | ||
980 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
981 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
982 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
983 | ||
d647a591 | 984 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 | 985 | { |
33dccbb0 | 986 | struct sock *sk; |
1da177e4 LT |
987 | struct tun_struct *tun; |
988 | struct net_device *dev; | |
989 | int err; | |
990 | ||
74a3e5a7 EB |
991 | dev = __dev_get_by_name(net, ifr->ifr_name); |
992 | if (dev) { | |
2b980dbd PM |
993 | const struct cred *cred = current_cred(); |
994 | ||
f85ba780 DW |
995 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
996 | return -EBUSY; | |
74a3e5a7 EB |
997 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
998 | tun = netdev_priv(dev); | |
999 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1000 | tun = netdev_priv(dev); | |
1001 | else | |
1002 | return -EINVAL; | |
1003 | ||
2b980dbd PM |
1004 | if (((tun->owner != -1 && cred->euid != tun->owner) || |
1005 | (tun->group != -1 && !in_egroup_p(tun->group))) && | |
1006 | !capable(CAP_NET_ADMIN)) | |
1007 | return -EPERM; | |
d7e9660a | 1008 | err = security_tun_dev_attach(tun->socket.sk); |
2b980dbd PM |
1009 | if (err < 0) |
1010 | return err; | |
1011 | ||
a7385ba2 EB |
1012 | err = tun_attach(tun, file); |
1013 | if (err < 0) | |
1014 | return err; | |
6aa20a22 | 1015 | } |
1da177e4 LT |
1016 | else { |
1017 | char *name; | |
1018 | unsigned long flags = 0; | |
1019 | ||
ca6bb5d7 DW |
1020 | if (!capable(CAP_NET_ADMIN)) |
1021 | return -EPERM; | |
2b980dbd PM |
1022 | err = security_tun_dev_create(); |
1023 | if (err < 0) | |
1024 | return err; | |
ca6bb5d7 | 1025 | |
1da177e4 LT |
1026 | /* Set dev type */ |
1027 | if (ifr->ifr_flags & IFF_TUN) { | |
1028 | /* TUN device */ | |
1029 | flags |= TUN_TUN_DEV; | |
1030 | name = "tun%d"; | |
1031 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1032 | /* TAP device */ | |
1033 | flags |= TUN_TAP_DEV; | |
1034 | name = "tap%d"; | |
6aa20a22 | 1035 | } else |
36989b90 | 1036 | return -EINVAL; |
6aa20a22 | 1037 | |
1da177e4 LT |
1038 | if (*ifr->ifr_name) |
1039 | name = ifr->ifr_name; | |
1040 | ||
1041 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
1042 | tun_setup); | |
1043 | if (!dev) | |
1044 | return -ENOMEM; | |
1045 | ||
fc54c658 | 1046 | dev_net_set(dev, net); |
f019a7a5 | 1047 | dev->rtnl_link_ops = &tun_link_ops; |
758e43b7 | 1048 | |
1da177e4 LT |
1049 | tun = netdev_priv(dev); |
1050 | tun->dev = dev; | |
1051 | tun->flags = flags; | |
f271b2cc | 1052 | tun->txflt.count = 0; |
d9d52b51 | 1053 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
1da177e4 | 1054 | |
33dccbb0 HX |
1055 | err = -ENOMEM; |
1056 | sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto); | |
1057 | if (!sk) | |
1058 | goto err_free_dev; | |
1059 | ||
43815482 ED |
1060 | tun->socket.wq = &tun->wq; |
1061 | init_waitqueue_head(&tun->wq.wait); | |
05c2828c | 1062 | tun->socket.ops = &tun_socket_ops; |
33dccbb0 HX |
1063 | sock_init_data(&tun->socket, sk); |
1064 | sk->sk_write_space = tun_sock_write_space; | |
33dccbb0 | 1065 | sk->sk_sndbuf = INT_MAX; |
33dccbb0 | 1066 | |
80924e5f | 1067 | tun_sk(sk)->tun = tun; |
33dccbb0 | 1068 | |
2b980dbd PM |
1069 | security_tun_dev_post_create(sk); |
1070 | ||
1da177e4 LT |
1071 | tun_net_init(dev); |
1072 | ||
1073 | if (strchr(dev->name, '%')) { | |
1074 | err = dev_alloc_name(dev, dev->name); | |
1075 | if (err < 0) | |
33dccbb0 | 1076 | goto err_free_sk; |
1da177e4 LT |
1077 | } |
1078 | ||
1079 | err = register_netdevice(tun->dev); | |
1080 | if (err < 0) | |
9c3fea6a HX |
1081 | goto err_free_sk; |
1082 | ||
980c9e8c DW |
1083 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1084 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1085 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
1086 | printk(KERN_ERR "Failed to create tun sysfs files\n"); | |
1087 | ||
9c3fea6a | 1088 | sk->sk_destruct = tun_sock_destruct; |
a7385ba2 EB |
1089 | |
1090 | err = tun_attach(tun, file); | |
1091 | if (err < 0) | |
9c3fea6a | 1092 | goto failed; |
1da177e4 LT |
1093 | } |
1094 | ||
1095 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
1096 | ||
1097 | if (ifr->ifr_flags & IFF_NO_PI) | |
1098 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1099 | else |
1100 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
1101 | |
1102 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
1103 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1104 | else |
1105 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1106 | |
f43798c2 RR |
1107 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1108 | tun->flags |= TUN_VNET_HDR; | |
1109 | else | |
1110 | tun->flags &= ~TUN_VNET_HDR; | |
1111 | ||
e35259a9 MK |
1112 | /* Make sure persistent devices do not get stuck in |
1113 | * xoff state. | |
1114 | */ | |
1115 | if (netif_running(tun->dev)) | |
1116 | netif_wake_queue(tun->dev); | |
1117 | ||
1da177e4 LT |
1118 | strcpy(ifr->ifr_name, tun->dev->name); |
1119 | return 0; | |
1120 | ||
33dccbb0 HX |
1121 | err_free_sk: |
1122 | sock_put(sk); | |
1da177e4 LT |
1123 | err_free_dev: |
1124 | free_netdev(dev); | |
1125 | failed: | |
1126 | return err; | |
1127 | } | |
1128 | ||
876bfd4d HX |
1129 | static int tun_get_iff(struct net *net, struct tun_struct *tun, |
1130 | struct ifreq *ifr) | |
e3b99556 | 1131 | { |
e3b99556 MM |
1132 | DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name); |
1133 | ||
1134 | strcpy(ifr->ifr_name, tun->dev->name); | |
1135 | ||
980c9e8c | 1136 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 MM |
1137 | |
1138 | return 0; | |
1139 | } | |
1140 | ||
5228ddc9 RR |
1141 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1142 | * privs required. */ | |
1143 | static int set_offload(struct net_device *dev, unsigned long arg) | |
1144 | { | |
1145 | unsigned int old_features, features; | |
1146 | ||
1147 | old_features = dev->features; | |
1148 | /* Unset features, set them as we chew on the arg. */ | |
1149 | features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST | |
e36aa25a SS |
1150 | |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6 |
1151 | |NETIF_F_UFO)); | |
5228ddc9 RR |
1152 | |
1153 | if (arg & TUN_F_CSUM) { | |
1154 | features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1155 | arg &= ~TUN_F_CSUM; | |
1156 | ||
1157 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1158 | if (arg & TUN_F_TSO_ECN) { | |
1159 | features |= NETIF_F_TSO_ECN; | |
1160 | arg &= ~TUN_F_TSO_ECN; | |
1161 | } | |
1162 | if (arg & TUN_F_TSO4) | |
1163 | features |= NETIF_F_TSO; | |
1164 | if (arg & TUN_F_TSO6) | |
1165 | features |= NETIF_F_TSO6; | |
1166 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1167 | } | |
e36aa25a SS |
1168 | |
1169 | if (arg & TUN_F_UFO) { | |
1170 | features |= NETIF_F_UFO; | |
1171 | arg &= ~TUN_F_UFO; | |
1172 | } | |
5228ddc9 RR |
1173 | } |
1174 | ||
1175 | /* This gives the user a way to test for new features in future by | |
1176 | * trying to set them. */ | |
1177 | if (arg) | |
1178 | return -EINVAL; | |
1179 | ||
1180 | dev->features = features; | |
1181 | if (old_features != dev->features) | |
1182 | netdev_features_change(dev); | |
1183 | ||
1184 | return 0; | |
1185 | } | |
1186 | ||
50857e2a AB |
1187 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1188 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1189 | { |
36b50bab | 1190 | struct tun_file *tfile = file->private_data; |
631ab46b | 1191 | struct tun_struct *tun; |
1da177e4 | 1192 | void __user* argp = (void __user*)arg; |
99405162 | 1193 | struct sock_fprog fprog; |
1da177e4 | 1194 | struct ifreq ifr; |
33dccbb0 | 1195 | int sndbuf; |
d9d52b51 | 1196 | int vnet_hdr_sz; |
f271b2cc | 1197 | int ret; |
1da177e4 LT |
1198 | |
1199 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
50857e2a | 1200 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 LT |
1201 | return -EFAULT; |
1202 | ||
631ab46b EB |
1203 | if (cmd == TUNGETFEATURES) { |
1204 | /* Currently this just means: "what IFF flags are valid?". | |
1205 | * This is needed because we never checked for invalid flags on | |
1206 | * TUNSETIFF. */ | |
1207 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
1208 | IFF_VNET_HDR, | |
1209 | (unsigned int __user*)argp); | |
1210 | } | |
1211 | ||
876bfd4d HX |
1212 | rtnl_lock(); |
1213 | ||
36b50bab | 1214 | tun = __tun_get(tfile); |
1da177e4 | 1215 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1216 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1217 | ||
876bfd4d | 1218 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1219 | |
876bfd4d HX |
1220 | if (ret) |
1221 | goto unlock; | |
1da177e4 | 1222 | |
50857e2a | 1223 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1224 | ret = -EFAULT; |
1225 | goto unlock; | |
1da177e4 LT |
1226 | } |
1227 | ||
876bfd4d | 1228 | ret = -EBADFD; |
1da177e4 | 1229 | if (!tun) |
876bfd4d | 1230 | goto unlock; |
1da177e4 LT |
1231 | |
1232 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
1233 | ||
631ab46b | 1234 | ret = 0; |
1da177e4 | 1235 | switch (cmd) { |
e3b99556 | 1236 | case TUNGETIFF: |
876bfd4d | 1237 | ret = tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1238 | if (ret) |
631ab46b | 1239 | break; |
e3b99556 | 1240 | |
50857e2a | 1241 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1242 | ret = -EFAULT; |
e3b99556 MM |
1243 | break; |
1244 | ||
1da177e4 LT |
1245 | case TUNSETNOCSUM: |
1246 | /* Disable/Enable checksum */ | |
1247 | if (arg) | |
1248 | tun->flags |= TUN_NOCHECKSUM; | |
1249 | else | |
1250 | tun->flags &= ~TUN_NOCHECKSUM; | |
1251 | ||
1252 | DBG(KERN_INFO "%s: checksum %s\n", | |
1253 | tun->dev->name, arg ? "disabled" : "enabled"); | |
1254 | break; | |
1255 | ||
1256 | case TUNSETPERSIST: | |
1257 | /* Disable/Enable persist mode */ | |
1258 | if (arg) | |
1259 | tun->flags |= TUN_PERSIST; | |
1260 | else | |
1261 | tun->flags &= ~TUN_PERSIST; | |
1262 | ||
1263 | DBG(KERN_INFO "%s: persist %s\n", | |
c6e991de | 1264 | tun->dev->name, arg ? "enabled" : "disabled"); |
1da177e4 LT |
1265 | break; |
1266 | ||
1267 | case TUNSETOWNER: | |
1268 | /* Set owner of the device */ | |
1269 | tun->owner = (uid_t) arg; | |
1270 | ||
1271 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
1272 | break; | |
1273 | ||
8c644623 GG |
1274 | case TUNSETGROUP: |
1275 | /* Set group of the device */ | |
1276 | tun->group= (gid_t) arg; | |
1277 | ||
1278 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); | |
1279 | break; | |
1280 | ||
ff4cc3ac MK |
1281 | case TUNSETLINK: |
1282 | /* Only allow setting the type when the interface is down */ | |
1283 | if (tun->dev->flags & IFF_UP) { | |
1284 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
1285 | tun->dev->name); | |
48abfe05 | 1286 | ret = -EBUSY; |
ff4cc3ac MK |
1287 | } else { |
1288 | tun->dev->type = (int) arg; | |
1289 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
48abfe05 | 1290 | ret = 0; |
ff4cc3ac | 1291 | } |
631ab46b | 1292 | break; |
ff4cc3ac | 1293 | |
1da177e4 LT |
1294 | #ifdef TUN_DEBUG |
1295 | case TUNSETDEBUG: | |
1296 | tun->debug = arg; | |
1297 | break; | |
1298 | #endif | |
5228ddc9 | 1299 | case TUNSETOFFLOAD: |
5228ddc9 | 1300 | ret = set_offload(tun->dev, arg); |
631ab46b | 1301 | break; |
5228ddc9 | 1302 | |
f271b2cc MK |
1303 | case TUNSETTXFILTER: |
1304 | /* Can be set only for TAPs */ | |
631ab46b | 1305 | ret = -EINVAL; |
f271b2cc | 1306 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 1307 | break; |
c0e5a8c2 | 1308 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 1309 | break; |
1da177e4 LT |
1310 | |
1311 | case SIOCGIFHWADDR: | |
f271b2cc MK |
1312 | /* Get hw addres */ |
1313 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); | |
1314 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 1315 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
1316 | ret = -EFAULT; |
1317 | break; | |
1da177e4 LT |
1318 | |
1319 | case SIOCSIFHWADDR: | |
f271b2cc | 1320 | /* Set hw address */ |
e174961c JB |
1321 | DBG(KERN_DEBUG "%s: set hw address: %pM\n", |
1322 | tun->dev->name, ifr.ifr_hwaddr.sa_data); | |
40102371 | 1323 | |
40102371 | 1324 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 1325 | break; |
33dccbb0 HX |
1326 | |
1327 | case TUNGETSNDBUF: | |
89f56d1e | 1328 | sndbuf = tun->socket.sk->sk_sndbuf; |
33dccbb0 HX |
1329 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
1330 | ret = -EFAULT; | |
1331 | break; | |
1332 | ||
1333 | case TUNSETSNDBUF: | |
1334 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
1335 | ret = -EFAULT; | |
1336 | break; | |
1337 | } | |
1338 | ||
89f56d1e | 1339 | tun->socket.sk->sk_sndbuf = sndbuf; |
33dccbb0 HX |
1340 | break; |
1341 | ||
d9d52b51 MT |
1342 | case TUNGETVNETHDRSZ: |
1343 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
1344 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
1345 | ret = -EFAULT; | |
1346 | break; | |
1347 | ||
1348 | case TUNSETVNETHDRSZ: | |
1349 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
1350 | ret = -EFAULT; | |
1351 | break; | |
1352 | } | |
1353 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
1354 | ret = -EINVAL; | |
1355 | break; | |
1356 | } | |
1357 | ||
1358 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
1359 | break; | |
1360 | ||
99405162 MT |
1361 | case TUNATTACHFILTER: |
1362 | /* Can be set only for TAPs */ | |
1363 | ret = -EINVAL; | |
1364 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1365 | break; | |
1366 | ret = -EFAULT; | |
1367 | if (copy_from_user(&fprog, argp, sizeof(fprog))) | |
1368 | break; | |
1369 | ||
1370 | ret = sk_attach_filter(&fprog, tun->socket.sk); | |
1371 | break; | |
1372 | ||
1373 | case TUNDETACHFILTER: | |
1374 | /* Can be set only for TAPs */ | |
1375 | ret = -EINVAL; | |
1376 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1377 | break; | |
1378 | ret = sk_detach_filter(tun->socket.sk); | |
1379 | break; | |
1380 | ||
1da177e4 | 1381 | default: |
631ab46b EB |
1382 | ret = -EINVAL; |
1383 | break; | |
ee289b64 | 1384 | } |
1da177e4 | 1385 | |
876bfd4d HX |
1386 | unlock: |
1387 | rtnl_unlock(); | |
1388 | if (tun) | |
1389 | tun_put(tun); | |
631ab46b | 1390 | return ret; |
1da177e4 LT |
1391 | } |
1392 | ||
50857e2a AB |
1393 | static long tun_chr_ioctl(struct file *file, |
1394 | unsigned int cmd, unsigned long arg) | |
1395 | { | |
1396 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
1397 | } | |
1398 | ||
1399 | #ifdef CONFIG_COMPAT | |
1400 | static long tun_chr_compat_ioctl(struct file *file, | |
1401 | unsigned int cmd, unsigned long arg) | |
1402 | { | |
1403 | switch (cmd) { | |
1404 | case TUNSETIFF: | |
1405 | case TUNGETIFF: | |
1406 | case TUNSETTXFILTER: | |
1407 | case TUNGETSNDBUF: | |
1408 | case TUNSETSNDBUF: | |
1409 | case SIOCGIFHWADDR: | |
1410 | case SIOCSIFHWADDR: | |
1411 | arg = (unsigned long)compat_ptr(arg); | |
1412 | break; | |
1413 | default: | |
1414 | arg = (compat_ulong_t)arg; | |
1415 | break; | |
1416 | } | |
1417 | ||
1418 | /* | |
1419 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
1420 | * the end of that structure. All fields that are used in this | |
1421 | * driver are compatible though, we don't need to convert the | |
1422 | * contents. | |
1423 | */ | |
1424 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
1425 | } | |
1426 | #endif /* CONFIG_COMPAT */ | |
1427 | ||
1da177e4 LT |
1428 | static int tun_chr_fasync(int fd, struct file *file, int on) |
1429 | { | |
631ab46b | 1430 | struct tun_struct *tun = tun_get(file); |
1da177e4 LT |
1431 | int ret; |
1432 | ||
1433 | if (!tun) | |
1434 | return -EBADFD; | |
1435 | ||
1436 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
1437 | ||
1438 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
9d319522 | 1439 | goto out; |
6aa20a22 | 1440 | |
1da177e4 | 1441 | if (on) { |
609d7fa9 | 1442 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 1443 | if (ret) |
9d319522 | 1444 | goto out; |
1da177e4 | 1445 | tun->flags |= TUN_FASYNC; |
6aa20a22 | 1446 | } else |
1da177e4 | 1447 | tun->flags &= ~TUN_FASYNC; |
9d319522 JC |
1448 | ret = 0; |
1449 | out: | |
631ab46b | 1450 | tun_put(tun); |
9d319522 | 1451 | return ret; |
1da177e4 LT |
1452 | } |
1453 | ||
1454 | static int tun_chr_open(struct inode *inode, struct file * file) | |
1455 | { | |
631ab46b | 1456 | struct tun_file *tfile; |
deed49fb | 1457 | |
1da177e4 | 1458 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); |
631ab46b EB |
1459 | |
1460 | tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); | |
1461 | if (!tfile) | |
1462 | return -ENOMEM; | |
c70f1829 | 1463 | atomic_set(&tfile->count, 0); |
631ab46b | 1464 | tfile->tun = NULL; |
36b50bab | 1465 | tfile->net = get_net(current->nsproxy->net_ns); |
631ab46b | 1466 | file->private_data = tfile; |
1da177e4 LT |
1467 | return 0; |
1468 | } | |
1469 | ||
1470 | static int tun_chr_close(struct inode *inode, struct file *file) | |
1471 | { | |
631ab46b | 1472 | struct tun_file *tfile = file->private_data; |
f0a4d0e5 | 1473 | struct tun_struct *tun; |
1da177e4 | 1474 | |
f0a4d0e5 | 1475 | tun = __tun_get(tfile); |
631ab46b | 1476 | if (tun) { |
d23e4365 HX |
1477 | struct net_device *dev = tun->dev; |
1478 | ||
1479 | DBG(KERN_INFO "%s: tun_chr_close\n", dev->name); | |
1da177e4 | 1480 | |
631ab46b | 1481 | __tun_detach(tun); |
1da177e4 | 1482 | |
3ad2f3fb | 1483 | /* If desirable, unregister the netdevice. */ |
d23e4365 HX |
1484 | if (!(tun->flags & TUN_PERSIST)) { |
1485 | rtnl_lock(); | |
1486 | if (dev->reg_state == NETREG_REGISTERED) | |
1487 | unregister_netdevice(dev); | |
1488 | rtnl_unlock(); | |
1489 | } | |
631ab46b | 1490 | } |
1da177e4 | 1491 | |
9c3fea6a HX |
1492 | tun = tfile->tun; |
1493 | if (tun) | |
89f56d1e | 1494 | sock_put(tun->socket.sk); |
9c3fea6a | 1495 | |
36b50bab | 1496 | put_net(tfile->net); |
631ab46b | 1497 | kfree(tfile); |
1da177e4 LT |
1498 | |
1499 | return 0; | |
1500 | } | |
1501 | ||
d54b1fdb | 1502 | static const struct file_operations tun_fops = { |
6aa20a22 | 1503 | .owner = THIS_MODULE, |
1da177e4 | 1504 | .llseek = no_llseek, |
ee0b3e67 BP |
1505 | .read = do_sync_read, |
1506 | .aio_read = tun_chr_aio_read, | |
1507 | .write = do_sync_write, | |
1508 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 1509 | .poll = tun_chr_poll, |
50857e2a AB |
1510 | .unlocked_ioctl = tun_chr_ioctl, |
1511 | #ifdef CONFIG_COMPAT | |
1512 | .compat_ioctl = tun_chr_compat_ioctl, | |
1513 | #endif | |
1da177e4 LT |
1514 | .open = tun_chr_open, |
1515 | .release = tun_chr_close, | |
6aa20a22 | 1516 | .fasync = tun_chr_fasync |
1da177e4 LT |
1517 | }; |
1518 | ||
1519 | static struct miscdevice tun_miscdev = { | |
1520 | .minor = TUN_MINOR, | |
1521 | .name = "tun", | |
e454cea2 | 1522 | .nodename = "net/tun", |
1da177e4 | 1523 | .fops = &tun_fops, |
1da177e4 LT |
1524 | }; |
1525 | ||
1526 | /* ethtool interface */ | |
1527 | ||
1528 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1529 | { | |
1530 | cmd->supported = 0; | |
1531 | cmd->advertising = 0; | |
1532 | cmd->speed = SPEED_10; | |
1533 | cmd->duplex = DUPLEX_FULL; | |
1534 | cmd->port = PORT_TP; | |
1535 | cmd->phy_address = 0; | |
1536 | cmd->transceiver = XCVR_INTERNAL; | |
1537 | cmd->autoneg = AUTONEG_DISABLE; | |
1538 | cmd->maxtxpkt = 0; | |
1539 | cmd->maxrxpkt = 0; | |
1540 | return 0; | |
1541 | } | |
1542 | ||
1543 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
1544 | { | |
1545 | struct tun_struct *tun = netdev_priv(dev); | |
1546 | ||
1547 | strcpy(info->driver, DRV_NAME); | |
1548 | strcpy(info->version, DRV_VERSION); | |
1549 | strcpy(info->fw_version, "N/A"); | |
1550 | ||
1551 | switch (tun->flags & TUN_TYPE_MASK) { | |
1552 | case TUN_TUN_DEV: | |
1553 | strcpy(info->bus_info, "tun"); | |
1554 | break; | |
1555 | case TUN_TAP_DEV: | |
1556 | strcpy(info->bus_info, "tap"); | |
1557 | break; | |
1558 | } | |
1559 | } | |
1560 | ||
1561 | static u32 tun_get_msglevel(struct net_device *dev) | |
1562 | { | |
1563 | #ifdef TUN_DEBUG | |
1564 | struct tun_struct *tun = netdev_priv(dev); | |
1565 | return tun->debug; | |
1566 | #else | |
1567 | return -EOPNOTSUPP; | |
1568 | #endif | |
1569 | } | |
1570 | ||
1571 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
1572 | { | |
1573 | #ifdef TUN_DEBUG | |
1574 | struct tun_struct *tun = netdev_priv(dev); | |
1575 | tun->debug = value; | |
1576 | #endif | |
1577 | } | |
1578 | ||
1da177e4 LT |
1579 | static u32 tun_get_rx_csum(struct net_device *dev) |
1580 | { | |
1581 | struct tun_struct *tun = netdev_priv(dev); | |
1582 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
1583 | } | |
1584 | ||
1585 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
1586 | { | |
1587 | struct tun_struct *tun = netdev_priv(dev); | |
1588 | if (data) | |
1589 | tun->flags &= ~TUN_NOCHECKSUM; | |
1590 | else | |
1591 | tun->flags |= TUN_NOCHECKSUM; | |
1592 | return 0; | |
1593 | } | |
1594 | ||
7282d491 | 1595 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
1596 | .get_settings = tun_get_settings, |
1597 | .get_drvinfo = tun_get_drvinfo, | |
1598 | .get_msglevel = tun_get_msglevel, | |
1599 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 1600 | .get_link = ethtool_op_get_link, |
1da177e4 LT |
1601 | .get_rx_csum = tun_get_rx_csum, |
1602 | .set_rx_csum = tun_set_rx_csum | |
1603 | }; | |
1604 | ||
79d17604 | 1605 | |
1da177e4 LT |
1606 | static int __init tun_init(void) |
1607 | { | |
1608 | int ret = 0; | |
1609 | ||
1610 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
1611 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
1612 | ||
f019a7a5 | 1613 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 1614 | if (ret) { |
f019a7a5 EB |
1615 | printk(KERN_ERR "tun: Can't register link_ops\n"); |
1616 | goto err_linkops; | |
79d17604 PE |
1617 | } |
1618 | ||
1da177e4 | 1619 | ret = misc_register(&tun_miscdev); |
79d17604 | 1620 | if (ret) { |
1da177e4 | 1621 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
1622 | goto err_misc; |
1623 | } | |
f019a7a5 | 1624 | return 0; |
79d17604 | 1625 | err_misc: |
f019a7a5 EB |
1626 | rtnl_link_unregister(&tun_link_ops); |
1627 | err_linkops: | |
1da177e4 LT |
1628 | return ret; |
1629 | } | |
1630 | ||
1631 | static void tun_cleanup(void) | |
1632 | { | |
6aa20a22 | 1633 | misc_deregister(&tun_miscdev); |
f019a7a5 | 1634 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
1635 | } |
1636 | ||
05c2828c MT |
1637 | /* Get an underlying socket object from tun file. Returns error unless file is |
1638 | * attached to a device. The returned object works like a packet socket, it | |
1639 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
1640 | * holding a reference to the file for as long as the socket is in use. */ | |
1641 | struct socket *tun_get_socket(struct file *file) | |
1642 | { | |
1643 | struct tun_struct *tun; | |
1644 | if (file->f_op != &tun_fops) | |
1645 | return ERR_PTR(-EINVAL); | |
1646 | tun = tun_get(file); | |
1647 | if (!tun) | |
1648 | return ERR_PTR(-EBADFD); | |
1649 | tun_put(tun); | |
1650 | return &tun->socket; | |
1651 | } | |
1652 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
1653 | ||
1da177e4 LT |
1654 | module_init(tun_init); |
1655 | module_exit(tun_cleanup); | |
1656 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1657 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1658 | MODULE_LICENSE("GPL"); | |
1659 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 1660 | MODULE_ALIAS("devname:net/tun"); |