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 | ||
6b8a66ee JP |
37 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
38 | ||
1da177e4 LT |
39 | #define DRV_NAME "tun" |
40 | #define DRV_VERSION "1.6" | |
41 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
42 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
43 | ||
1da177e4 LT |
44 | #include <linux/module.h> |
45 | #include <linux/errno.h> | |
46 | #include <linux/kernel.h> | |
47 | #include <linux/major.h> | |
48 | #include <linux/slab.h> | |
49 | #include <linux/poll.h> | |
50 | #include <linux/fcntl.h> | |
51 | #include <linux/init.h> | |
52 | #include <linux/skbuff.h> | |
53 | #include <linux/netdevice.h> | |
54 | #include <linux/etherdevice.h> | |
55 | #include <linux/miscdevice.h> | |
56 | #include <linux/ethtool.h> | |
57 | #include <linux/rtnetlink.h> | |
50857e2a | 58 | #include <linux/compat.h> |
1da177e4 LT |
59 | #include <linux/if.h> |
60 | #include <linux/if_arp.h> | |
61 | #include <linux/if_ether.h> | |
62 | #include <linux/if_tun.h> | |
63 | #include <linux/crc32.h> | |
d647a591 | 64 | #include <linux/nsproxy.h> |
f43798c2 | 65 | #include <linux/virtio_net.h> |
99405162 | 66 | #include <linux/rcupdate.h> |
881d966b | 67 | #include <net/net_namespace.h> |
79d17604 | 68 | #include <net/netns/generic.h> |
f019a7a5 | 69 | #include <net/rtnetlink.h> |
33dccbb0 | 70 | #include <net/sock.h> |
1da177e4 LT |
71 | |
72 | #include <asm/system.h> | |
73 | #include <asm/uaccess.h> | |
74 | ||
14daa021 RR |
75 | /* Uncomment to enable debugging */ |
76 | /* #define TUN_DEBUG 1 */ | |
77 | ||
1da177e4 LT |
78 | #ifdef TUN_DEBUG |
79 | static int debug; | |
14daa021 | 80 | |
6b8a66ee JP |
81 | #define tun_debug(level, tun, fmt, args...) \ |
82 | do { \ | |
83 | if (tun->debug) \ | |
84 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
85 | } while (0) | |
86 | #define DBG1(level, fmt, args...) \ | |
87 | do { \ | |
88 | if (debug == 2) \ | |
89 | printk(level fmt, ##args); \ | |
90 | } while (0) | |
14daa021 | 91 | #else |
6b8a66ee JP |
92 | #define tun_debug(level, tun, fmt, args...) \ |
93 | do { \ | |
94 | if (0) \ | |
95 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
96 | } while (0) | |
97 | #define DBG1(level, fmt, args...) \ | |
98 | do { \ | |
99 | if (0) \ | |
100 | printk(level fmt, ##args); \ | |
101 | } while (0) | |
14daa021 RR |
102 | #endif |
103 | ||
f271b2cc MK |
104 | #define FLT_EXACT_COUNT 8 |
105 | struct tap_filter { | |
106 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
107 | u32 mask[2]; /* Mask of the hashed addrs */ | |
108 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
109 | }; | |
110 | ||
631ab46b | 111 | struct tun_file { |
c70f1829 | 112 | atomic_t count; |
631ab46b | 113 | struct tun_struct *tun; |
36b50bab | 114 | struct net *net; |
631ab46b EB |
115 | }; |
116 | ||
33dccbb0 HX |
117 | struct tun_sock; |
118 | ||
14daa021 | 119 | struct tun_struct { |
631ab46b | 120 | struct tun_file *tfile; |
f271b2cc | 121 | unsigned int flags; |
14daa021 RR |
122 | uid_t owner; |
123 | gid_t group; | |
124 | ||
14daa021 | 125 | struct net_device *dev; |
f271b2cc | 126 | struct fasync_struct *fasync; |
14daa021 | 127 | |
f271b2cc | 128 | struct tap_filter txflt; |
33dccbb0 | 129 | struct socket socket; |
43815482 | 130 | struct socket_wq wq; |
d9d52b51 MT |
131 | |
132 | int vnet_hdr_sz; | |
133 | ||
14daa021 RR |
134 | #ifdef TUN_DEBUG |
135 | int debug; | |
1da177e4 | 136 | #endif |
14daa021 | 137 | }; |
1da177e4 | 138 | |
33dccbb0 HX |
139 | struct tun_sock { |
140 | struct sock sk; | |
141 | struct tun_struct *tun; | |
142 | }; | |
143 | ||
144 | static inline struct tun_sock *tun_sk(struct sock *sk) | |
145 | { | |
146 | return container_of(sk, struct tun_sock, sk); | |
147 | } | |
148 | ||
a7385ba2 EB |
149 | static int tun_attach(struct tun_struct *tun, struct file *file) |
150 | { | |
631ab46b | 151 | struct tun_file *tfile = file->private_data; |
38231b7a | 152 | int err; |
a7385ba2 EB |
153 | |
154 | ASSERT_RTNL(); | |
155 | ||
38231b7a EB |
156 | netif_tx_lock_bh(tun->dev); |
157 | ||
158 | err = -EINVAL; | |
159 | if (tfile->tun) | |
160 | goto out; | |
161 | ||
162 | err = -EBUSY; | |
163 | if (tun->tfile) | |
164 | goto out; | |
165 | ||
166 | err = 0; | |
631ab46b EB |
167 | tfile->tun = tun; |
168 | tun->tfile = tfile; | |
05c2828c | 169 | tun->socket.file = file; |
bee31369 | 170 | netif_carrier_on(tun->dev); |
c70f1829 | 171 | dev_hold(tun->dev); |
89f56d1e | 172 | sock_hold(tun->socket.sk); |
c70f1829 | 173 | atomic_inc(&tfile->count); |
a7385ba2 | 174 | |
38231b7a EB |
175 | out: |
176 | netif_tx_unlock_bh(tun->dev); | |
177 | return err; | |
a7385ba2 EB |
178 | } |
179 | ||
631ab46b EB |
180 | static void __tun_detach(struct tun_struct *tun) |
181 | { | |
631ab46b | 182 | /* Detach from net device */ |
38231b7a | 183 | netif_tx_lock_bh(tun->dev); |
bee31369 | 184 | netif_carrier_off(tun->dev); |
631ab46b | 185 | tun->tfile = NULL; |
05c2828c | 186 | tun->socket.file = NULL; |
38231b7a | 187 | netif_tx_unlock_bh(tun->dev); |
631ab46b EB |
188 | |
189 | /* Drop read queue */ | |
89f56d1e | 190 | skb_queue_purge(&tun->socket.sk->sk_receive_queue); |
c70f1829 EB |
191 | |
192 | /* Drop the extra count on the net device */ | |
193 | dev_put(tun->dev); | |
194 | } | |
195 | ||
196 | static void tun_detach(struct tun_struct *tun) | |
197 | { | |
198 | rtnl_lock(); | |
199 | __tun_detach(tun); | |
200 | rtnl_unlock(); | |
631ab46b EB |
201 | } |
202 | ||
203 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
204 | { | |
c70f1829 EB |
205 | struct tun_struct *tun = NULL; |
206 | ||
207 | if (atomic_inc_not_zero(&tfile->count)) | |
208 | tun = tfile->tun; | |
209 | ||
210 | return tun; | |
631ab46b EB |
211 | } |
212 | ||
213 | static struct tun_struct *tun_get(struct file *file) | |
214 | { | |
215 | return __tun_get(file->private_data); | |
216 | } | |
217 | ||
218 | static void tun_put(struct tun_struct *tun) | |
219 | { | |
c70f1829 EB |
220 | struct tun_file *tfile = tun->tfile; |
221 | ||
222 | if (atomic_dec_and_test(&tfile->count)) | |
223 | tun_detach(tfile->tun); | |
631ab46b EB |
224 | } |
225 | ||
6b8a66ee | 226 | /* TAP filtering */ |
f271b2cc MK |
227 | static void addr_hash_set(u32 *mask, const u8 *addr) |
228 | { | |
229 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
230 | mask[n >> 5] |= (1 << (n & 31)); | |
231 | } | |
232 | ||
233 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
234 | { | |
235 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
236 | return mask[n >> 5] & (1 << (n & 31)); | |
237 | } | |
238 | ||
239 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
240 | { | |
241 | struct { u8 u[ETH_ALEN]; } *addr; | |
242 | struct tun_filter uf; | |
243 | int err, alen, n, nexact; | |
244 | ||
245 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
246 | return -EFAULT; | |
247 | ||
248 | if (!uf.count) { | |
249 | /* Disabled */ | |
250 | filter->count = 0; | |
251 | return 0; | |
252 | } | |
253 | ||
254 | alen = ETH_ALEN * uf.count; | |
255 | addr = kmalloc(alen, GFP_KERNEL); | |
256 | if (!addr) | |
257 | return -ENOMEM; | |
258 | ||
259 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
260 | err = -EFAULT; | |
261 | goto done; | |
262 | } | |
263 | ||
264 | /* The filter is updated without holding any locks. Which is | |
265 | * perfectly safe. We disable it first and in the worst | |
266 | * case we'll accept a few undesired packets. */ | |
267 | filter->count = 0; | |
268 | wmb(); | |
269 | ||
270 | /* Use first set of addresses as an exact filter */ | |
271 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
272 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
273 | ||
274 | nexact = n; | |
275 | ||
cfbf84fc AW |
276 | /* Remaining multicast addresses are hashed, |
277 | * unicast will leave the filter disabled. */ | |
f271b2cc | 278 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
279 | for (; n < uf.count; n++) { |
280 | if (!is_multicast_ether_addr(addr[n].u)) { | |
281 | err = 0; /* no filter */ | |
282 | goto done; | |
283 | } | |
f271b2cc | 284 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 285 | } |
f271b2cc MK |
286 | |
287 | /* For ALLMULTI just set the mask to all ones. | |
288 | * This overrides the mask populated above. */ | |
289 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
290 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
291 | ||
292 | /* Now enable the filter */ | |
293 | wmb(); | |
294 | filter->count = nexact; | |
295 | ||
296 | /* Return the number of exact filters */ | |
297 | err = nexact; | |
298 | ||
299 | done: | |
300 | kfree(addr); | |
301 | return err; | |
302 | } | |
303 | ||
304 | /* Returns: 0 - drop, !=0 - accept */ | |
305 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
306 | { | |
307 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
308 | * at this point. */ | |
309 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
310 | int i; | |
311 | ||
312 | /* Exact match */ | |
313 | for (i = 0; i < filter->count; i++) | |
314 | if (!compare_ether_addr(eh->h_dest, filter->addr[i])) | |
315 | return 1; | |
316 | ||
317 | /* Inexact match (multicast only) */ | |
318 | if (is_multicast_ether_addr(eh->h_dest)) | |
319 | return addr_hash_test(filter->mask, eh->h_dest); | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | /* | |
325 | * Checks whether the packet is accepted or not. | |
326 | * Returns: 0 - drop, !=0 - accept | |
327 | */ | |
328 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
329 | { | |
330 | if (!filter->count) | |
331 | return 1; | |
332 | ||
333 | return run_filter(filter, skb); | |
334 | } | |
335 | ||
1da177e4 LT |
336 | /* Network device part of the driver */ |
337 | ||
7282d491 | 338 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 339 | |
c70f1829 EB |
340 | /* Net device detach from fd. */ |
341 | static void tun_net_uninit(struct net_device *dev) | |
342 | { | |
343 | struct tun_struct *tun = netdev_priv(dev); | |
344 | struct tun_file *tfile = tun->tfile; | |
345 | ||
346 | /* Inform the methods they need to stop using the dev. | |
347 | */ | |
348 | if (tfile) { | |
43815482 | 349 | wake_up_all(&tun->wq.wait); |
c70f1829 EB |
350 | if (atomic_dec_and_test(&tfile->count)) |
351 | __tun_detach(tun); | |
352 | } | |
353 | } | |
354 | ||
9c3fea6a HX |
355 | static void tun_free_netdev(struct net_device *dev) |
356 | { | |
357 | struct tun_struct *tun = netdev_priv(dev); | |
358 | ||
89f56d1e | 359 | sock_put(tun->socket.sk); |
9c3fea6a HX |
360 | } |
361 | ||
1da177e4 LT |
362 | /* Net device open. */ |
363 | static int tun_net_open(struct net_device *dev) | |
364 | { | |
365 | netif_start_queue(dev); | |
366 | return 0; | |
367 | } | |
368 | ||
369 | /* Net device close. */ | |
370 | static int tun_net_close(struct net_device *dev) | |
371 | { | |
372 | netif_stop_queue(dev); | |
373 | return 0; | |
374 | } | |
375 | ||
376 | /* Net device start xmit */ | |
424efe9c | 377 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
378 | { |
379 | struct tun_struct *tun = netdev_priv(dev); | |
380 | ||
6b8a66ee | 381 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
1da177e4 LT |
382 | |
383 | /* Drop packet if interface is not attached */ | |
631ab46b | 384 | if (!tun->tfile) |
1da177e4 LT |
385 | goto drop; |
386 | ||
f271b2cc MK |
387 | /* Drop if the filter does not like it. |
388 | * This is a noop if the filter is disabled. | |
389 | * Filter can be enabled only for the TAP devices. */ | |
390 | if (!check_filter(&tun->txflt, skb)) | |
391 | goto drop; | |
392 | ||
99405162 MT |
393 | if (tun->socket.sk->sk_filter && |
394 | sk_filter(tun->socket.sk, skb)) | |
395 | goto drop; | |
396 | ||
89f56d1e | 397 | if (skb_queue_len(&tun->socket.sk->sk_receive_queue) >= dev->tx_queue_len) { |
1da177e4 LT |
398 | if (!(tun->flags & TUN_ONE_QUEUE)) { |
399 | /* Normal queueing mode. */ | |
400 | /* Packet scheduler handles dropping of further packets. */ | |
401 | netif_stop_queue(dev); | |
402 | ||
403 | /* We won't see all dropped packets individually, so overrun | |
404 | * error is more appropriate. */ | |
09f75cd7 | 405 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
406 | } else { |
407 | /* Single queue mode. | |
408 | * Driver handles dropping of all packets itself. */ | |
409 | goto drop; | |
410 | } | |
411 | } | |
412 | ||
0110d6f2 MT |
413 | /* Orphan the skb - required as we might hang on to it |
414 | * for indefinite time. */ | |
415 | skb_orphan(skb); | |
416 | ||
f271b2cc | 417 | /* Enqueue packet */ |
89f56d1e | 418 | skb_queue_tail(&tun->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
419 | |
420 | /* Notify and wake up reader process */ | |
421 | if (tun->flags & TUN_FASYNC) | |
422 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
43815482 | 423 | wake_up_interruptible_poll(&tun->wq.wait, POLLIN | |
05c2828c | 424 | POLLRDNORM | POLLRDBAND); |
6ed10654 | 425 | return NETDEV_TX_OK; |
1da177e4 LT |
426 | |
427 | drop: | |
09f75cd7 | 428 | dev->stats.tx_dropped++; |
1da177e4 | 429 | kfree_skb(skb); |
6ed10654 | 430 | return NETDEV_TX_OK; |
1da177e4 LT |
431 | } |
432 | ||
f271b2cc | 433 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 434 | { |
f271b2cc MK |
435 | /* |
436 | * This callback is supposed to deal with mc filter in | |
437 | * _rx_ path and has nothing to do with the _tx_ path. | |
438 | * In rx path we always accept everything userspace gives us. | |
439 | */ | |
1da177e4 LT |
440 | } |
441 | ||
4885a504 ES |
442 | #define MIN_MTU 68 |
443 | #define MAX_MTU 65535 | |
444 | ||
445 | static int | |
446 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
447 | { | |
448 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
449 | return -EINVAL; | |
450 | dev->mtu = new_mtu; | |
451 | return 0; | |
452 | } | |
453 | ||
758e43b7 | 454 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 455 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
456 | .ndo_open = tun_net_open, |
457 | .ndo_stop = tun_net_close, | |
00829823 | 458 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 459 | .ndo_change_mtu = tun_net_change_mtu, |
758e43b7 SH |
460 | }; |
461 | ||
462 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 463 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
464 | .ndo_open = tun_net_open, |
465 | .ndo_stop = tun_net_close, | |
00829823 | 466 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 SH |
467 | .ndo_change_mtu = tun_net_change_mtu, |
468 | .ndo_set_multicast_list = tun_net_mclist, | |
469 | .ndo_set_mac_address = eth_mac_addr, | |
470 | .ndo_validate_addr = eth_validate_addr, | |
471 | }; | |
472 | ||
1da177e4 LT |
473 | /* Initialize net device. */ |
474 | static void tun_net_init(struct net_device *dev) | |
475 | { | |
476 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 477 | |
1da177e4 LT |
478 | switch (tun->flags & TUN_TYPE_MASK) { |
479 | case TUN_TUN_DEV: | |
758e43b7 SH |
480 | dev->netdev_ops = &tun_netdev_ops; |
481 | ||
1da177e4 LT |
482 | /* Point-to-Point TUN Device */ |
483 | dev->hard_header_len = 0; | |
484 | dev->addr_len = 0; | |
485 | dev->mtu = 1500; | |
486 | ||
487 | /* Zero header length */ | |
6aa20a22 | 488 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
489 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
490 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
491 | break; | |
492 | ||
493 | case TUN_TAP_DEV: | |
7a0a9608 | 494 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 495 | /* Ethernet TAP Device */ |
1da177e4 | 496 | ether_setup(dev); |
36226a8d | 497 | |
f271b2cc | 498 | random_ether_addr(dev->dev_addr); |
36226a8d | 499 | |
1da177e4 LT |
500 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
501 | break; | |
502 | } | |
503 | } | |
504 | ||
505 | /* Character device part */ | |
506 | ||
507 | /* Poll */ | |
508 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 509 | { |
b2430de3 EB |
510 | struct tun_file *tfile = file->private_data; |
511 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 512 | struct sock *sk; |
33dccbb0 | 513 | unsigned int mask = 0; |
1da177e4 LT |
514 | |
515 | if (!tun) | |
eac9e902 | 516 | return POLLERR; |
1da177e4 | 517 | |
89f56d1e | 518 | sk = tun->socket.sk; |
3c8a9c63 | 519 | |
6b8a66ee | 520 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 521 | |
43815482 | 522 | poll_wait(file, &tun->wq.wait, wait); |
6aa20a22 | 523 | |
89f56d1e | 524 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
525 | mask |= POLLIN | POLLRDNORM; |
526 | ||
33dccbb0 HX |
527 | if (sock_writeable(sk) || |
528 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
529 | sock_writeable(sk))) | |
530 | mask |= POLLOUT | POLLWRNORM; | |
531 | ||
c70f1829 EB |
532 | if (tun->dev->reg_state != NETREG_REGISTERED) |
533 | mask = POLLERR; | |
534 | ||
631ab46b | 535 | tun_put(tun); |
1da177e4 LT |
536 | return mask; |
537 | } | |
538 | ||
f42157cb RR |
539 | /* prepad is the amount to reserve at front. len is length after that. |
540 | * linear is a hint as to how much to copy (usually headers). */ | |
33dccbb0 HX |
541 | static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun, |
542 | size_t prepad, size_t len, | |
543 | size_t linear, int noblock) | |
f42157cb | 544 | { |
89f56d1e | 545 | struct sock *sk = tun->socket.sk; |
f42157cb | 546 | struct sk_buff *skb; |
33dccbb0 | 547 | int err; |
f42157cb | 548 | |
82862742 HX |
549 | sock_update_classid(sk); |
550 | ||
f42157cb | 551 | /* Under a page? Don't bother with paged skb. */ |
0eca93bc | 552 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 553 | linear = len; |
f42157cb | 554 | |
33dccbb0 HX |
555 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
556 | &err); | |
f42157cb | 557 | if (!skb) |
33dccbb0 | 558 | return ERR_PTR(err); |
f42157cb RR |
559 | |
560 | skb_reserve(skb, prepad); | |
561 | skb_put(skb, linear); | |
33dccbb0 HX |
562 | skb->data_len = len - linear; |
563 | skb->len += len - linear; | |
f42157cb RR |
564 | |
565 | return skb; | |
566 | } | |
567 | ||
1da177e4 | 568 | /* Get packet from user space buffer */ |
33dccbb0 | 569 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, |
6f26c9a7 | 570 | const struct iovec *iv, size_t count, |
33dccbb0 | 571 | int noblock) |
1da177e4 | 572 | { |
09640e63 | 573 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 LT |
574 | struct sk_buff *skb; |
575 | size_t len = count, align = 0; | |
f43798c2 | 576 | struct virtio_net_hdr gso = { 0 }; |
6f26c9a7 | 577 | int offset = 0; |
1da177e4 LT |
578 | |
579 | if (!(tun->flags & TUN_NO_PI)) { | |
580 | if ((len -= sizeof(pi)) > count) | |
581 | return -EINVAL; | |
582 | ||
6f26c9a7 | 583 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 584 | return -EFAULT; |
6f26c9a7 | 585 | offset += sizeof(pi); |
1da177e4 LT |
586 | } |
587 | ||
f43798c2 | 588 | if (tun->flags & TUN_VNET_HDR) { |
d9d52b51 | 589 | if ((len -= tun->vnet_hdr_sz) > count) |
f43798c2 RR |
590 | return -EINVAL; |
591 | ||
6f26c9a7 | 592 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
593 | return -EFAULT; |
594 | ||
4909122f HX |
595 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
596 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
597 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
598 | ||
f43798c2 RR |
599 | if (gso.hdr_len > len) |
600 | return -EINVAL; | |
d9d52b51 | 601 | offset += tun->vnet_hdr_sz; |
f43798c2 RR |
602 | } |
603 | ||
e01bf1c8 | 604 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
1da177e4 | 605 | align = NET_IP_ALIGN; |
0eca93bc HX |
606 | if (unlikely(len < ETH_HLEN || |
607 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
608 | return -EINVAL; |
609 | } | |
6aa20a22 | 610 | |
33dccbb0 HX |
611 | skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock); |
612 | if (IS_ERR(skb)) { | |
613 | if (PTR_ERR(skb) != -EAGAIN) | |
614 | tun->dev->stats.rx_dropped++; | |
615 | return PTR_ERR(skb); | |
1da177e4 LT |
616 | } |
617 | ||
6f26c9a7 | 618 | if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) { |
09f75cd7 | 619 | tun->dev->stats.rx_dropped++; |
8f22757e | 620 | kfree_skb(skb); |
1da177e4 | 621 | return -EFAULT; |
8f22757e | 622 | } |
1da177e4 | 623 | |
f43798c2 RR |
624 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
625 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
626 | gso.csum_offset)) { | |
627 | tun->dev->stats.rx_frame_errors++; | |
628 | kfree_skb(skb); | |
629 | return -EINVAL; | |
630 | } | |
631 | } else if (tun->flags & TUN_NOCHECKSUM) | |
632 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
633 | ||
1da177e4 LT |
634 | switch (tun->flags & TUN_TYPE_MASK) { |
635 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
636 | if (tun->flags & TUN_NO_PI) { |
637 | switch (skb->data[0] & 0xf0) { | |
638 | case 0x40: | |
639 | pi.proto = htons(ETH_P_IP); | |
640 | break; | |
641 | case 0x60: | |
642 | pi.proto = htons(ETH_P_IPV6); | |
643 | break; | |
644 | default: | |
645 | tun->dev->stats.rx_dropped++; | |
646 | kfree_skb(skb); | |
647 | return -EINVAL; | |
648 | } | |
649 | } | |
650 | ||
459a98ed | 651 | skb_reset_mac_header(skb); |
1da177e4 | 652 | skb->protocol = pi.proto; |
4c13eb66 | 653 | skb->dev = tun->dev; |
1da177e4 LT |
654 | break; |
655 | case TUN_TAP_DEV: | |
656 | skb->protocol = eth_type_trans(skb, tun->dev); | |
657 | break; | |
658 | }; | |
659 | ||
f43798c2 RR |
660 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
661 | pr_debug("GSO!\n"); | |
662 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
663 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
664 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
665 | break; | |
666 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
667 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
668 | break; | |
e36aa25a SS |
669 | case VIRTIO_NET_HDR_GSO_UDP: |
670 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
671 | break; | |
f43798c2 RR |
672 | default: |
673 | tun->dev->stats.rx_frame_errors++; | |
674 | kfree_skb(skb); | |
675 | return -EINVAL; | |
676 | } | |
677 | ||
678 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
679 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
680 | ||
681 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
682 | if (skb_shinfo(skb)->gso_size == 0) { | |
683 | tun->dev->stats.rx_frame_errors++; | |
684 | kfree_skb(skb); | |
685 | return -EINVAL; | |
686 | } | |
687 | ||
688 | /* Header must be checked, and gso_segs computed. */ | |
689 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
690 | skb_shinfo(skb)->gso_segs = 0; | |
691 | } | |
6aa20a22 | 692 | |
1da177e4 | 693 | netif_rx_ni(skb); |
6aa20a22 | 694 | |
09f75cd7 JG |
695 | tun->dev->stats.rx_packets++; |
696 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
697 | |
698 | return count; | |
6aa20a22 | 699 | } |
1da177e4 | 700 | |
ee0b3e67 BP |
701 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
702 | unsigned long count, loff_t pos) | |
1da177e4 | 703 | { |
33dccbb0 | 704 | struct file *file = iocb->ki_filp; |
ab46d779 | 705 | struct tun_struct *tun = tun_get(file); |
631ab46b | 706 | ssize_t result; |
1da177e4 LT |
707 | |
708 | if (!tun) | |
709 | return -EBADFD; | |
710 | ||
6b8a66ee | 711 | tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count); |
1da177e4 | 712 | |
6f26c9a7 | 713 | result = tun_get_user(tun, iv, iov_length(iv, count), |
33dccbb0 | 714 | file->f_flags & O_NONBLOCK); |
631ab46b EB |
715 | |
716 | tun_put(tun); | |
717 | return result; | |
1da177e4 LT |
718 | } |
719 | ||
1da177e4 LT |
720 | /* Put packet to the user space buffer */ |
721 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
722 | struct sk_buff *skb, | |
43b39dcd | 723 | const struct iovec *iv, int len) |
1da177e4 LT |
724 | { |
725 | struct tun_pi pi = { 0, skb->protocol }; | |
726 | ssize_t total = 0; | |
727 | ||
728 | if (!(tun->flags & TUN_NO_PI)) { | |
729 | if ((len -= sizeof(pi)) < 0) | |
730 | return -EINVAL; | |
731 | ||
732 | if (len < skb->len) { | |
733 | /* Packet will be striped */ | |
734 | pi.flags |= TUN_PKT_STRIP; | |
735 | } | |
6aa20a22 | 736 | |
43b39dcd | 737 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
738 | return -EFAULT; |
739 | total += sizeof(pi); | |
6aa20a22 | 740 | } |
1da177e4 | 741 | |
f43798c2 RR |
742 | if (tun->flags & TUN_VNET_HDR) { |
743 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
d9d52b51 | 744 | if ((len -= tun->vnet_hdr_sz) < 0) |
f43798c2 RR |
745 | return -EINVAL; |
746 | ||
747 | if (skb_is_gso(skb)) { | |
748 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
749 | ||
750 | /* This is a hint as to how much should be linear. */ | |
751 | gso.hdr_len = skb_headlen(skb); | |
752 | gso.gso_size = sinfo->gso_size; | |
753 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
754 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
755 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
756 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e36aa25a SS |
757 | else if (sinfo->gso_type & SKB_GSO_UDP) |
758 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
ef3db4a5 | 759 | else { |
6b8a66ee | 760 | pr_err("unexpected GSO type: " |
ef3db4a5 MT |
761 | "0x%x, gso_size %d, hdr_len %d\n", |
762 | sinfo->gso_type, gso.gso_size, | |
763 | gso.hdr_len); | |
764 | print_hex_dump(KERN_ERR, "tun: ", | |
765 | DUMP_PREFIX_NONE, | |
766 | 16, 1, skb->head, | |
767 | min((int)gso.hdr_len, 64), true); | |
768 | WARN_ON_ONCE(1); | |
769 | return -EINVAL; | |
770 | } | |
f43798c2 RR |
771 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
772 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
773 | } else | |
774 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
775 | ||
776 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
777 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 778 | gso.csum_start = skb_checksum_start_offset(skb); |
f43798c2 RR |
779 | gso.csum_offset = skb->csum_offset; |
780 | } /* else everything is zero */ | |
781 | ||
43b39dcd MT |
782 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
783 | sizeof(gso)))) | |
f43798c2 | 784 | return -EFAULT; |
d9d52b51 | 785 | total += tun->vnet_hdr_sz; |
f43798c2 RR |
786 | } |
787 | ||
1da177e4 LT |
788 | len = min_t(int, skb->len, len); |
789 | ||
43b39dcd | 790 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
05c2828c | 791 | total += skb->len; |
1da177e4 | 792 | |
09f75cd7 JG |
793 | tun->dev->stats.tx_packets++; |
794 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
795 | |
796 | return total; | |
797 | } | |
798 | ||
05c2828c MT |
799 | static ssize_t tun_do_read(struct tun_struct *tun, |
800 | struct kiocb *iocb, const struct iovec *iv, | |
801 | ssize_t len, int noblock) | |
1da177e4 | 802 | { |
1da177e4 LT |
803 | DECLARE_WAITQUEUE(wait, current); |
804 | struct sk_buff *skb; | |
05c2828c | 805 | ssize_t ret = 0; |
1da177e4 | 806 | |
6b8a66ee | 807 | tun_debug(KERN_INFO, tun, "tun_chr_read\n"); |
1da177e4 | 808 | |
43815482 | 809 | add_wait_queue(&tun->wq.wait, &wait); |
1da177e4 | 810 | while (len) { |
1da177e4 LT |
811 | current->state = TASK_INTERRUPTIBLE; |
812 | ||
813 | /* Read frames from the queue */ | |
89f56d1e | 814 | if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) { |
05c2828c | 815 | if (noblock) { |
1da177e4 LT |
816 | ret = -EAGAIN; |
817 | break; | |
818 | } | |
819 | if (signal_pending(current)) { | |
820 | ret = -ERESTARTSYS; | |
821 | break; | |
822 | } | |
c70f1829 EB |
823 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
824 | ret = -EIO; | |
825 | break; | |
826 | } | |
1da177e4 LT |
827 | |
828 | /* Nothing to read, let's sleep */ | |
829 | schedule(); | |
830 | continue; | |
831 | } | |
832 | netif_wake_queue(tun->dev); | |
833 | ||
43b39dcd | 834 | ret = tun_put_user(tun, skb, iv, len); |
f271b2cc MK |
835 | kfree_skb(skb); |
836 | break; | |
1da177e4 LT |
837 | } |
838 | ||
839 | current->state = TASK_RUNNING; | |
43815482 | 840 | remove_wait_queue(&tun->wq.wait, &wait); |
1da177e4 | 841 | |
05c2828c MT |
842 | return ret; |
843 | } | |
844 | ||
845 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
846 | unsigned long count, loff_t pos) | |
847 | { | |
848 | struct file *file = iocb->ki_filp; | |
849 | struct tun_file *tfile = file->private_data; | |
850 | struct tun_struct *tun = __tun_get(tfile); | |
851 | ssize_t len, ret; | |
852 | ||
853 | if (!tun) | |
854 | return -EBADFD; | |
855 | len = iov_length(iv, count); | |
856 | if (len < 0) { | |
857 | ret = -EINVAL; | |
858 | goto out; | |
859 | } | |
860 | ||
861 | ret = tun_do_read(tun, iocb, iv, len, file->f_flags & O_NONBLOCK); | |
862 | ret = min_t(ssize_t, ret, len); | |
631ab46b EB |
863 | out: |
864 | tun_put(tun); | |
1da177e4 LT |
865 | return ret; |
866 | } | |
867 | ||
1da177e4 LT |
868 | static void tun_setup(struct net_device *dev) |
869 | { | |
870 | struct tun_struct *tun = netdev_priv(dev); | |
871 | ||
1da177e4 | 872 | tun->owner = -1; |
8c644623 | 873 | tun->group = -1; |
1da177e4 | 874 | |
1da177e4 | 875 | dev->ethtool_ops = &tun_ethtool_ops; |
9c3fea6a | 876 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
877 | } |
878 | ||
f019a7a5 EB |
879 | /* Trivial set of netlink ops to allow deleting tun or tap |
880 | * device with netlink. | |
881 | */ | |
882 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
883 | { | |
884 | return -EINVAL; | |
885 | } | |
886 | ||
887 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
888 | .kind = DRV_NAME, | |
889 | .priv_size = sizeof(struct tun_struct), | |
890 | .setup = tun_setup, | |
891 | .validate = tun_validate, | |
892 | }; | |
893 | ||
33dccbb0 HX |
894 | static void tun_sock_write_space(struct sock *sk) |
895 | { | |
896 | struct tun_struct *tun; | |
43815482 | 897 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
898 | |
899 | if (!sock_writeable(sk)) | |
900 | return; | |
901 | ||
33dccbb0 HX |
902 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
903 | return; | |
904 | ||
43815482 ED |
905 | wqueue = sk_sleep(sk); |
906 | if (wqueue && waitqueue_active(wqueue)) | |
907 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 908 | POLLWRNORM | POLLWRBAND); |
c722c625 | 909 | |
80924e5f | 910 | tun = tun_sk(sk)->tun; |
33dccbb0 HX |
911 | kill_fasync(&tun->fasync, SIGIO, POLL_OUT); |
912 | } | |
913 | ||
914 | static void tun_sock_destruct(struct sock *sk) | |
915 | { | |
80924e5f | 916 | free_netdev(tun_sk(sk)->tun->dev); |
33dccbb0 HX |
917 | } |
918 | ||
05c2828c MT |
919 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
920 | struct msghdr *m, size_t total_len) | |
921 | { | |
922 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
923 | return tun_get_user(tun, m->msg_iov, total_len, | |
924 | m->msg_flags & MSG_DONTWAIT); | |
925 | } | |
926 | ||
927 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, | |
928 | struct msghdr *m, size_t total_len, | |
929 | int flags) | |
930 | { | |
931 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
932 | int ret; | |
933 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) | |
934 | return -EINVAL; | |
935 | ret = tun_do_read(tun, iocb, m->msg_iov, total_len, | |
936 | flags & MSG_DONTWAIT); | |
937 | if (ret > total_len) { | |
938 | m->msg_flags |= MSG_TRUNC; | |
939 | ret = flags & MSG_TRUNC ? ret : total_len; | |
940 | } | |
941 | return ret; | |
942 | } | |
943 | ||
944 | /* Ops structure to mimic raw sockets with tun */ | |
945 | static const struct proto_ops tun_socket_ops = { | |
946 | .sendmsg = tun_sendmsg, | |
947 | .recvmsg = tun_recvmsg, | |
948 | }; | |
949 | ||
33dccbb0 HX |
950 | static struct proto tun_proto = { |
951 | .name = "tun", | |
952 | .owner = THIS_MODULE, | |
953 | .obj_size = sizeof(struct tun_sock), | |
954 | }; | |
f019a7a5 | 955 | |
980c9e8c DW |
956 | static int tun_flags(struct tun_struct *tun) |
957 | { | |
958 | int flags = 0; | |
959 | ||
960 | if (tun->flags & TUN_TUN_DEV) | |
961 | flags |= IFF_TUN; | |
962 | else | |
963 | flags |= IFF_TAP; | |
964 | ||
965 | if (tun->flags & TUN_NO_PI) | |
966 | flags |= IFF_NO_PI; | |
967 | ||
968 | if (tun->flags & TUN_ONE_QUEUE) | |
969 | flags |= IFF_ONE_QUEUE; | |
970 | ||
971 | if (tun->flags & TUN_VNET_HDR) | |
972 | flags |= IFF_VNET_HDR; | |
973 | ||
974 | return flags; | |
975 | } | |
976 | ||
977 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
978 | char *buf) | |
979 | { | |
980 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
981 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
982 | } | |
983 | ||
984 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
985 | char *buf) | |
986 | { | |
987 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
988 | return sprintf(buf, "%d\n", tun->owner); | |
989 | } | |
990 | ||
991 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
992 | char *buf) | |
993 | { | |
994 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
995 | return sprintf(buf, "%d\n", tun->group); | |
996 | } | |
997 | ||
998 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
999 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1000 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1001 | ||
d647a591 | 1002 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 | 1003 | { |
33dccbb0 | 1004 | struct sock *sk; |
1da177e4 LT |
1005 | struct tun_struct *tun; |
1006 | struct net_device *dev; | |
1007 | int err; | |
1008 | ||
74a3e5a7 EB |
1009 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1010 | if (dev) { | |
2b980dbd PM |
1011 | const struct cred *cred = current_cred(); |
1012 | ||
f85ba780 DW |
1013 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1014 | return -EBUSY; | |
74a3e5a7 EB |
1015 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1016 | tun = netdev_priv(dev); | |
1017 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1018 | tun = netdev_priv(dev); | |
1019 | else | |
1020 | return -EINVAL; | |
1021 | ||
2b980dbd PM |
1022 | if (((tun->owner != -1 && cred->euid != tun->owner) || |
1023 | (tun->group != -1 && !in_egroup_p(tun->group))) && | |
1024 | !capable(CAP_NET_ADMIN)) | |
1025 | return -EPERM; | |
d7e9660a | 1026 | err = security_tun_dev_attach(tun->socket.sk); |
2b980dbd PM |
1027 | if (err < 0) |
1028 | return err; | |
1029 | ||
a7385ba2 EB |
1030 | err = tun_attach(tun, file); |
1031 | if (err < 0) | |
1032 | return err; | |
6aa20a22 | 1033 | } |
1da177e4 LT |
1034 | else { |
1035 | char *name; | |
1036 | unsigned long flags = 0; | |
1037 | ||
ca6bb5d7 DW |
1038 | if (!capable(CAP_NET_ADMIN)) |
1039 | return -EPERM; | |
2b980dbd PM |
1040 | err = security_tun_dev_create(); |
1041 | if (err < 0) | |
1042 | return err; | |
ca6bb5d7 | 1043 | |
1da177e4 LT |
1044 | /* Set dev type */ |
1045 | if (ifr->ifr_flags & IFF_TUN) { | |
1046 | /* TUN device */ | |
1047 | flags |= TUN_TUN_DEV; | |
1048 | name = "tun%d"; | |
1049 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1050 | /* TAP device */ | |
1051 | flags |= TUN_TAP_DEV; | |
1052 | name = "tap%d"; | |
6aa20a22 | 1053 | } else |
36989b90 | 1054 | return -EINVAL; |
6aa20a22 | 1055 | |
1da177e4 LT |
1056 | if (*ifr->ifr_name) |
1057 | name = ifr->ifr_name; | |
1058 | ||
1059 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
1060 | tun_setup); | |
1061 | if (!dev) | |
1062 | return -ENOMEM; | |
1063 | ||
fc54c658 | 1064 | dev_net_set(dev, net); |
f019a7a5 | 1065 | dev->rtnl_link_ops = &tun_link_ops; |
758e43b7 | 1066 | |
1da177e4 LT |
1067 | tun = netdev_priv(dev); |
1068 | tun->dev = dev; | |
1069 | tun->flags = flags; | |
f271b2cc | 1070 | tun->txflt.count = 0; |
d9d52b51 | 1071 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
1da177e4 | 1072 | |
33dccbb0 HX |
1073 | err = -ENOMEM; |
1074 | sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto); | |
1075 | if (!sk) | |
1076 | goto err_free_dev; | |
1077 | ||
43815482 ED |
1078 | tun->socket.wq = &tun->wq; |
1079 | init_waitqueue_head(&tun->wq.wait); | |
05c2828c | 1080 | tun->socket.ops = &tun_socket_ops; |
33dccbb0 HX |
1081 | sock_init_data(&tun->socket, sk); |
1082 | sk->sk_write_space = tun_sock_write_space; | |
33dccbb0 | 1083 | sk->sk_sndbuf = INT_MAX; |
33dccbb0 | 1084 | |
80924e5f | 1085 | tun_sk(sk)->tun = tun; |
33dccbb0 | 1086 | |
2b980dbd PM |
1087 | security_tun_dev_post_create(sk); |
1088 | ||
1da177e4 LT |
1089 | tun_net_init(dev); |
1090 | ||
1091 | if (strchr(dev->name, '%')) { | |
1092 | err = dev_alloc_name(dev, dev->name); | |
1093 | if (err < 0) | |
33dccbb0 | 1094 | goto err_free_sk; |
1da177e4 LT |
1095 | } |
1096 | ||
1097 | err = register_netdevice(tun->dev); | |
1098 | if (err < 0) | |
9c3fea6a HX |
1099 | goto err_free_sk; |
1100 | ||
980c9e8c DW |
1101 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1102 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1103 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
6b8a66ee | 1104 | pr_err("Failed to create tun sysfs files\n"); |
980c9e8c | 1105 | |
9c3fea6a | 1106 | sk->sk_destruct = tun_sock_destruct; |
a7385ba2 EB |
1107 | |
1108 | err = tun_attach(tun, file); | |
1109 | if (err < 0) | |
9c3fea6a | 1110 | goto failed; |
1da177e4 LT |
1111 | } |
1112 | ||
6b8a66ee | 1113 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 LT |
1114 | |
1115 | if (ifr->ifr_flags & IFF_NO_PI) | |
1116 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1117 | else |
1118 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
1119 | |
1120 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
1121 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1122 | else |
1123 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1124 | |
f43798c2 RR |
1125 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1126 | tun->flags |= TUN_VNET_HDR; | |
1127 | else | |
1128 | tun->flags &= ~TUN_VNET_HDR; | |
1129 | ||
e35259a9 MK |
1130 | /* Make sure persistent devices do not get stuck in |
1131 | * xoff state. | |
1132 | */ | |
1133 | if (netif_running(tun->dev)) | |
1134 | netif_wake_queue(tun->dev); | |
1135 | ||
1da177e4 LT |
1136 | strcpy(ifr->ifr_name, tun->dev->name); |
1137 | return 0; | |
1138 | ||
33dccbb0 HX |
1139 | err_free_sk: |
1140 | sock_put(sk); | |
1da177e4 LT |
1141 | err_free_dev: |
1142 | free_netdev(dev); | |
1143 | failed: | |
1144 | return err; | |
1145 | } | |
1146 | ||
876bfd4d HX |
1147 | static int tun_get_iff(struct net *net, struct tun_struct *tun, |
1148 | struct ifreq *ifr) | |
e3b99556 | 1149 | { |
6b8a66ee | 1150 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1151 | |
1152 | strcpy(ifr->ifr_name, tun->dev->name); | |
1153 | ||
980c9e8c | 1154 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 MM |
1155 | |
1156 | return 0; | |
1157 | } | |
1158 | ||
5228ddc9 RR |
1159 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1160 | * privs required. */ | |
1161 | static int set_offload(struct net_device *dev, unsigned long arg) | |
1162 | { | |
04ed3e74 | 1163 | u32 old_features, features; |
5228ddc9 RR |
1164 | |
1165 | old_features = dev->features; | |
1166 | /* Unset features, set them as we chew on the arg. */ | |
1167 | features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST | |
e36aa25a SS |
1168 | |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6 |
1169 | |NETIF_F_UFO)); | |
5228ddc9 RR |
1170 | |
1171 | if (arg & TUN_F_CSUM) { | |
1172 | features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
1173 | arg &= ~TUN_F_CSUM; | |
1174 | ||
1175 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1176 | if (arg & TUN_F_TSO_ECN) { | |
1177 | features |= NETIF_F_TSO_ECN; | |
1178 | arg &= ~TUN_F_TSO_ECN; | |
1179 | } | |
1180 | if (arg & TUN_F_TSO4) | |
1181 | features |= NETIF_F_TSO; | |
1182 | if (arg & TUN_F_TSO6) | |
1183 | features |= NETIF_F_TSO6; | |
1184 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1185 | } | |
e36aa25a SS |
1186 | |
1187 | if (arg & TUN_F_UFO) { | |
1188 | features |= NETIF_F_UFO; | |
1189 | arg &= ~TUN_F_UFO; | |
1190 | } | |
5228ddc9 RR |
1191 | } |
1192 | ||
1193 | /* This gives the user a way to test for new features in future by | |
1194 | * trying to set them. */ | |
1195 | if (arg) | |
1196 | return -EINVAL; | |
1197 | ||
1198 | dev->features = features; | |
1199 | if (old_features != dev->features) | |
1200 | netdev_features_change(dev); | |
1201 | ||
1202 | return 0; | |
1203 | } | |
1204 | ||
50857e2a AB |
1205 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1206 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1207 | { |
36b50bab | 1208 | struct tun_file *tfile = file->private_data; |
631ab46b | 1209 | struct tun_struct *tun; |
1da177e4 | 1210 | void __user* argp = (void __user*)arg; |
99405162 | 1211 | struct sock_fprog fprog; |
1da177e4 | 1212 | struct ifreq ifr; |
33dccbb0 | 1213 | int sndbuf; |
d9d52b51 | 1214 | int vnet_hdr_sz; |
f271b2cc | 1215 | int ret; |
1da177e4 LT |
1216 | |
1217 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
50857e2a | 1218 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 LT |
1219 | return -EFAULT; |
1220 | ||
631ab46b EB |
1221 | if (cmd == TUNGETFEATURES) { |
1222 | /* Currently this just means: "what IFF flags are valid?". | |
1223 | * This is needed because we never checked for invalid flags on | |
1224 | * TUNSETIFF. */ | |
1225 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
1226 | IFF_VNET_HDR, | |
1227 | (unsigned int __user*)argp); | |
1228 | } | |
1229 | ||
876bfd4d HX |
1230 | rtnl_lock(); |
1231 | ||
36b50bab | 1232 | tun = __tun_get(tfile); |
1da177e4 | 1233 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1234 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1235 | ||
876bfd4d | 1236 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1237 | |
876bfd4d HX |
1238 | if (ret) |
1239 | goto unlock; | |
1da177e4 | 1240 | |
50857e2a | 1241 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1242 | ret = -EFAULT; |
1243 | goto unlock; | |
1da177e4 LT |
1244 | } |
1245 | ||
876bfd4d | 1246 | ret = -EBADFD; |
1da177e4 | 1247 | if (!tun) |
876bfd4d | 1248 | goto unlock; |
1da177e4 | 1249 | |
6b8a66ee | 1250 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %d\n", cmd); |
1da177e4 | 1251 | |
631ab46b | 1252 | ret = 0; |
1da177e4 | 1253 | switch (cmd) { |
e3b99556 | 1254 | case TUNGETIFF: |
876bfd4d | 1255 | ret = tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1256 | if (ret) |
631ab46b | 1257 | break; |
e3b99556 | 1258 | |
50857e2a | 1259 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1260 | ret = -EFAULT; |
e3b99556 MM |
1261 | break; |
1262 | ||
1da177e4 LT |
1263 | case TUNSETNOCSUM: |
1264 | /* Disable/Enable checksum */ | |
1265 | if (arg) | |
1266 | tun->flags |= TUN_NOCHECKSUM; | |
1267 | else | |
1268 | tun->flags &= ~TUN_NOCHECKSUM; | |
1269 | ||
6b8a66ee JP |
1270 | tun_debug(KERN_INFO, tun, "checksum %s\n", |
1271 | arg ? "disabled" : "enabled"); | |
1da177e4 LT |
1272 | break; |
1273 | ||
1274 | case TUNSETPERSIST: | |
1275 | /* Disable/Enable persist mode */ | |
1276 | if (arg) | |
1277 | tun->flags |= TUN_PERSIST; | |
1278 | else | |
1279 | tun->flags &= ~TUN_PERSIST; | |
1280 | ||
6b8a66ee JP |
1281 | tun_debug(KERN_INFO, tun, "persist %s\n", |
1282 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
1283 | break; |
1284 | ||
1285 | case TUNSETOWNER: | |
1286 | /* Set owner of the device */ | |
1287 | tun->owner = (uid_t) arg; | |
1288 | ||
6b8a66ee | 1289 | tun_debug(KERN_INFO, tun, "owner set to %d\n", tun->owner); |
1da177e4 LT |
1290 | break; |
1291 | ||
8c644623 GG |
1292 | case TUNSETGROUP: |
1293 | /* Set group of the device */ | |
1294 | tun->group= (gid_t) arg; | |
1295 | ||
6b8a66ee | 1296 | tun_debug(KERN_INFO, tun, "group set to %d\n", tun->group); |
8c644623 GG |
1297 | break; |
1298 | ||
ff4cc3ac MK |
1299 | case TUNSETLINK: |
1300 | /* Only allow setting the type when the interface is down */ | |
1301 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
1302 | tun_debug(KERN_INFO, tun, |
1303 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 1304 | ret = -EBUSY; |
ff4cc3ac MK |
1305 | } else { |
1306 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
1307 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
1308 | tun->dev->type); | |
48abfe05 | 1309 | ret = 0; |
ff4cc3ac | 1310 | } |
631ab46b | 1311 | break; |
ff4cc3ac | 1312 | |
1da177e4 LT |
1313 | #ifdef TUN_DEBUG |
1314 | case TUNSETDEBUG: | |
1315 | tun->debug = arg; | |
1316 | break; | |
1317 | #endif | |
5228ddc9 | 1318 | case TUNSETOFFLOAD: |
5228ddc9 | 1319 | ret = set_offload(tun->dev, arg); |
631ab46b | 1320 | break; |
5228ddc9 | 1321 | |
f271b2cc MK |
1322 | case TUNSETTXFILTER: |
1323 | /* Can be set only for TAPs */ | |
631ab46b | 1324 | ret = -EINVAL; |
f271b2cc | 1325 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 1326 | break; |
c0e5a8c2 | 1327 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 1328 | break; |
1da177e4 LT |
1329 | |
1330 | case SIOCGIFHWADDR: | |
b595076a | 1331 | /* Get hw address */ |
f271b2cc MK |
1332 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
1333 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 1334 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
1335 | ret = -EFAULT; |
1336 | break; | |
1da177e4 LT |
1337 | |
1338 | case SIOCSIFHWADDR: | |
f271b2cc | 1339 | /* Set hw address */ |
6b8a66ee JP |
1340 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
1341 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 1342 | |
40102371 | 1343 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 1344 | break; |
33dccbb0 HX |
1345 | |
1346 | case TUNGETSNDBUF: | |
89f56d1e | 1347 | sndbuf = tun->socket.sk->sk_sndbuf; |
33dccbb0 HX |
1348 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
1349 | ret = -EFAULT; | |
1350 | break; | |
1351 | ||
1352 | case TUNSETSNDBUF: | |
1353 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
1354 | ret = -EFAULT; | |
1355 | break; | |
1356 | } | |
1357 | ||
89f56d1e | 1358 | tun->socket.sk->sk_sndbuf = sndbuf; |
33dccbb0 HX |
1359 | break; |
1360 | ||
d9d52b51 MT |
1361 | case TUNGETVNETHDRSZ: |
1362 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
1363 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
1364 | ret = -EFAULT; | |
1365 | break; | |
1366 | ||
1367 | case TUNSETVNETHDRSZ: | |
1368 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
1369 | ret = -EFAULT; | |
1370 | break; | |
1371 | } | |
1372 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
1373 | ret = -EINVAL; | |
1374 | break; | |
1375 | } | |
1376 | ||
1377 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
1378 | break; | |
1379 | ||
99405162 MT |
1380 | case TUNATTACHFILTER: |
1381 | /* Can be set only for TAPs */ | |
1382 | ret = -EINVAL; | |
1383 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1384 | break; | |
1385 | ret = -EFAULT; | |
1386 | if (copy_from_user(&fprog, argp, sizeof(fprog))) | |
1387 | break; | |
1388 | ||
1389 | ret = sk_attach_filter(&fprog, tun->socket.sk); | |
1390 | break; | |
1391 | ||
1392 | case TUNDETACHFILTER: | |
1393 | /* Can be set only for TAPs */ | |
1394 | ret = -EINVAL; | |
1395 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1396 | break; | |
1397 | ret = sk_detach_filter(tun->socket.sk); | |
1398 | break; | |
1399 | ||
1da177e4 | 1400 | default: |
631ab46b EB |
1401 | ret = -EINVAL; |
1402 | break; | |
ee289b64 | 1403 | } |
1da177e4 | 1404 | |
876bfd4d HX |
1405 | unlock: |
1406 | rtnl_unlock(); | |
1407 | if (tun) | |
1408 | tun_put(tun); | |
631ab46b | 1409 | return ret; |
1da177e4 LT |
1410 | } |
1411 | ||
50857e2a AB |
1412 | static long tun_chr_ioctl(struct file *file, |
1413 | unsigned int cmd, unsigned long arg) | |
1414 | { | |
1415 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
1416 | } | |
1417 | ||
1418 | #ifdef CONFIG_COMPAT | |
1419 | static long tun_chr_compat_ioctl(struct file *file, | |
1420 | unsigned int cmd, unsigned long arg) | |
1421 | { | |
1422 | switch (cmd) { | |
1423 | case TUNSETIFF: | |
1424 | case TUNGETIFF: | |
1425 | case TUNSETTXFILTER: | |
1426 | case TUNGETSNDBUF: | |
1427 | case TUNSETSNDBUF: | |
1428 | case SIOCGIFHWADDR: | |
1429 | case SIOCSIFHWADDR: | |
1430 | arg = (unsigned long)compat_ptr(arg); | |
1431 | break; | |
1432 | default: | |
1433 | arg = (compat_ulong_t)arg; | |
1434 | break; | |
1435 | } | |
1436 | ||
1437 | /* | |
1438 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
1439 | * the end of that structure. All fields that are used in this | |
1440 | * driver are compatible though, we don't need to convert the | |
1441 | * contents. | |
1442 | */ | |
1443 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
1444 | } | |
1445 | #endif /* CONFIG_COMPAT */ | |
1446 | ||
1da177e4 LT |
1447 | static int tun_chr_fasync(int fd, struct file *file, int on) |
1448 | { | |
631ab46b | 1449 | struct tun_struct *tun = tun_get(file); |
1da177e4 LT |
1450 | int ret; |
1451 | ||
1452 | if (!tun) | |
1453 | return -EBADFD; | |
1454 | ||
6b8a66ee | 1455 | tun_debug(KERN_INFO, tun, "tun_chr_fasync %d\n", on); |
1da177e4 LT |
1456 | |
1457 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
9d319522 | 1458 | goto out; |
6aa20a22 | 1459 | |
1da177e4 | 1460 | if (on) { |
609d7fa9 | 1461 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 1462 | if (ret) |
9d319522 | 1463 | goto out; |
1da177e4 | 1464 | tun->flags |= TUN_FASYNC; |
6aa20a22 | 1465 | } else |
1da177e4 | 1466 | tun->flags &= ~TUN_FASYNC; |
9d319522 JC |
1467 | ret = 0; |
1468 | out: | |
631ab46b | 1469 | tun_put(tun); |
9d319522 | 1470 | return ret; |
1da177e4 LT |
1471 | } |
1472 | ||
1473 | static int tun_chr_open(struct inode *inode, struct file * file) | |
1474 | { | |
631ab46b | 1475 | struct tun_file *tfile; |
deed49fb | 1476 | |
6b8a66ee | 1477 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b EB |
1478 | |
1479 | tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); | |
1480 | if (!tfile) | |
1481 | return -ENOMEM; | |
c70f1829 | 1482 | atomic_set(&tfile->count, 0); |
631ab46b | 1483 | tfile->tun = NULL; |
36b50bab | 1484 | tfile->net = get_net(current->nsproxy->net_ns); |
631ab46b | 1485 | file->private_data = tfile; |
1da177e4 LT |
1486 | return 0; |
1487 | } | |
1488 | ||
1489 | static int tun_chr_close(struct inode *inode, struct file *file) | |
1490 | { | |
631ab46b | 1491 | struct tun_file *tfile = file->private_data; |
f0a4d0e5 | 1492 | struct tun_struct *tun; |
1da177e4 | 1493 | |
f0a4d0e5 | 1494 | tun = __tun_get(tfile); |
631ab46b | 1495 | if (tun) { |
d23e4365 HX |
1496 | struct net_device *dev = tun->dev; |
1497 | ||
6b8a66ee | 1498 | tun_debug(KERN_INFO, tun, "tun_chr_close\n"); |
1da177e4 | 1499 | |
631ab46b | 1500 | __tun_detach(tun); |
1da177e4 | 1501 | |
3ad2f3fb | 1502 | /* If desirable, unregister the netdevice. */ |
d23e4365 HX |
1503 | if (!(tun->flags & TUN_PERSIST)) { |
1504 | rtnl_lock(); | |
1505 | if (dev->reg_state == NETREG_REGISTERED) | |
1506 | unregister_netdevice(dev); | |
1507 | rtnl_unlock(); | |
1508 | } | |
631ab46b | 1509 | } |
1da177e4 | 1510 | |
9c3fea6a HX |
1511 | tun = tfile->tun; |
1512 | if (tun) | |
89f56d1e | 1513 | sock_put(tun->socket.sk); |
9c3fea6a | 1514 | |
36b50bab | 1515 | put_net(tfile->net); |
631ab46b | 1516 | kfree(tfile); |
1da177e4 LT |
1517 | |
1518 | return 0; | |
1519 | } | |
1520 | ||
d54b1fdb | 1521 | static const struct file_operations tun_fops = { |
6aa20a22 | 1522 | .owner = THIS_MODULE, |
1da177e4 | 1523 | .llseek = no_llseek, |
ee0b3e67 BP |
1524 | .read = do_sync_read, |
1525 | .aio_read = tun_chr_aio_read, | |
1526 | .write = do_sync_write, | |
1527 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 1528 | .poll = tun_chr_poll, |
50857e2a AB |
1529 | .unlocked_ioctl = tun_chr_ioctl, |
1530 | #ifdef CONFIG_COMPAT | |
1531 | .compat_ioctl = tun_chr_compat_ioctl, | |
1532 | #endif | |
1da177e4 LT |
1533 | .open = tun_chr_open, |
1534 | .release = tun_chr_close, | |
6aa20a22 | 1535 | .fasync = tun_chr_fasync |
1da177e4 LT |
1536 | }; |
1537 | ||
1538 | static struct miscdevice tun_miscdev = { | |
1539 | .minor = TUN_MINOR, | |
1540 | .name = "tun", | |
e454cea2 | 1541 | .nodename = "net/tun", |
1da177e4 | 1542 | .fops = &tun_fops, |
1da177e4 LT |
1543 | }; |
1544 | ||
1545 | /* ethtool interface */ | |
1546 | ||
1547 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1548 | { | |
1549 | cmd->supported = 0; | |
1550 | cmd->advertising = 0; | |
1551 | cmd->speed = SPEED_10; | |
1552 | cmd->duplex = DUPLEX_FULL; | |
1553 | cmd->port = PORT_TP; | |
1554 | cmd->phy_address = 0; | |
1555 | cmd->transceiver = XCVR_INTERNAL; | |
1556 | cmd->autoneg = AUTONEG_DISABLE; | |
1557 | cmd->maxtxpkt = 0; | |
1558 | cmd->maxrxpkt = 0; | |
1559 | return 0; | |
1560 | } | |
1561 | ||
1562 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
1563 | { | |
1564 | struct tun_struct *tun = netdev_priv(dev); | |
1565 | ||
1566 | strcpy(info->driver, DRV_NAME); | |
1567 | strcpy(info->version, DRV_VERSION); | |
1568 | strcpy(info->fw_version, "N/A"); | |
1569 | ||
1570 | switch (tun->flags & TUN_TYPE_MASK) { | |
1571 | case TUN_TUN_DEV: | |
1572 | strcpy(info->bus_info, "tun"); | |
1573 | break; | |
1574 | case TUN_TAP_DEV: | |
1575 | strcpy(info->bus_info, "tap"); | |
1576 | break; | |
1577 | } | |
1578 | } | |
1579 | ||
1580 | static u32 tun_get_msglevel(struct net_device *dev) | |
1581 | { | |
1582 | #ifdef TUN_DEBUG | |
1583 | struct tun_struct *tun = netdev_priv(dev); | |
1584 | return tun->debug; | |
1585 | #else | |
1586 | return -EOPNOTSUPP; | |
1587 | #endif | |
1588 | } | |
1589 | ||
1590 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
1591 | { | |
1592 | #ifdef TUN_DEBUG | |
1593 | struct tun_struct *tun = netdev_priv(dev); | |
1594 | tun->debug = value; | |
1595 | #endif | |
1596 | } | |
1597 | ||
1da177e4 LT |
1598 | static u32 tun_get_rx_csum(struct net_device *dev) |
1599 | { | |
1600 | struct tun_struct *tun = netdev_priv(dev); | |
1601 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
1602 | } | |
1603 | ||
1604 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
1605 | { | |
1606 | struct tun_struct *tun = netdev_priv(dev); | |
1607 | if (data) | |
1608 | tun->flags &= ~TUN_NOCHECKSUM; | |
1609 | else | |
1610 | tun->flags |= TUN_NOCHECKSUM; | |
1611 | return 0; | |
1612 | } | |
1613 | ||
7282d491 | 1614 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
1615 | .get_settings = tun_get_settings, |
1616 | .get_drvinfo = tun_get_drvinfo, | |
1617 | .get_msglevel = tun_get_msglevel, | |
1618 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 1619 | .get_link = ethtool_op_get_link, |
1da177e4 LT |
1620 | .get_rx_csum = tun_get_rx_csum, |
1621 | .set_rx_csum = tun_set_rx_csum | |
1622 | }; | |
1623 | ||
79d17604 | 1624 | |
1da177e4 LT |
1625 | static int __init tun_init(void) |
1626 | { | |
1627 | int ret = 0; | |
1628 | ||
6b8a66ee JP |
1629 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
1630 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 1631 | |
f019a7a5 | 1632 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 1633 | if (ret) { |
6b8a66ee | 1634 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 1635 | goto err_linkops; |
79d17604 PE |
1636 | } |
1637 | ||
1da177e4 | 1638 | ret = misc_register(&tun_miscdev); |
79d17604 | 1639 | if (ret) { |
6b8a66ee | 1640 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
1641 | goto err_misc; |
1642 | } | |
f019a7a5 | 1643 | return 0; |
79d17604 | 1644 | err_misc: |
f019a7a5 EB |
1645 | rtnl_link_unregister(&tun_link_ops); |
1646 | err_linkops: | |
1da177e4 LT |
1647 | return ret; |
1648 | } | |
1649 | ||
1650 | static void tun_cleanup(void) | |
1651 | { | |
6aa20a22 | 1652 | misc_deregister(&tun_miscdev); |
f019a7a5 | 1653 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
1654 | } |
1655 | ||
05c2828c MT |
1656 | /* Get an underlying socket object from tun file. Returns error unless file is |
1657 | * attached to a device. The returned object works like a packet socket, it | |
1658 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
1659 | * holding a reference to the file for as long as the socket is in use. */ | |
1660 | struct socket *tun_get_socket(struct file *file) | |
1661 | { | |
1662 | struct tun_struct *tun; | |
1663 | if (file->f_op != &tun_fops) | |
1664 | return ERR_PTR(-EINVAL); | |
1665 | tun = tun_get(file); | |
1666 | if (!tun) | |
1667 | return ERR_PTR(-EBADFD); | |
1668 | tun_put(tun); | |
1669 | return &tun->socket; | |
1670 | } | |
1671 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
1672 | ||
1da177e4 LT |
1673 | module_init(tun_init); |
1674 | module_exit(tun_cleanup); | |
1675 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1676 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1677 | MODULE_LICENSE("GPL"); | |
1678 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 1679 | MODULE_ALIAS("devname:net/tun"); |