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 | 71 | |
1da177e4 LT |
72 | #include <asm/uaccess.h> |
73 | ||
14daa021 RR |
74 | /* Uncomment to enable debugging */ |
75 | /* #define TUN_DEBUG 1 */ | |
76 | ||
1da177e4 LT |
77 | #ifdef TUN_DEBUG |
78 | static int debug; | |
14daa021 | 79 | |
6b8a66ee JP |
80 | #define tun_debug(level, tun, fmt, args...) \ |
81 | do { \ | |
82 | if (tun->debug) \ | |
83 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
84 | } while (0) | |
85 | #define DBG1(level, fmt, args...) \ | |
86 | do { \ | |
87 | if (debug == 2) \ | |
88 | printk(level fmt, ##args); \ | |
89 | } while (0) | |
14daa021 | 90 | #else |
6b8a66ee JP |
91 | #define tun_debug(level, tun, fmt, args...) \ |
92 | do { \ | |
93 | if (0) \ | |
94 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
95 | } while (0) | |
96 | #define DBG1(level, fmt, args...) \ | |
97 | do { \ | |
98 | if (0) \ | |
99 | printk(level fmt, ##args); \ | |
100 | } while (0) | |
14daa021 RR |
101 | #endif |
102 | ||
f271b2cc MK |
103 | #define FLT_EXACT_COUNT 8 |
104 | struct tap_filter { | |
105 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
106 | u32 mask[2]; /* Mask of the hashed addrs */ | |
107 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
108 | }; | |
109 | ||
631ab46b | 110 | struct tun_file { |
c70f1829 | 111 | atomic_t count; |
631ab46b | 112 | struct tun_struct *tun; |
36b50bab | 113 | struct net *net; |
631ab46b EB |
114 | }; |
115 | ||
33dccbb0 HX |
116 | struct tun_sock; |
117 | ||
14daa021 | 118 | struct tun_struct { |
631ab46b | 119 | struct tun_file *tfile; |
f271b2cc | 120 | unsigned int flags; |
14daa021 RR |
121 | uid_t owner; |
122 | gid_t group; | |
123 | ||
14daa021 | 124 | struct net_device *dev; |
c8f44aff | 125 | netdev_features_t set_features; |
88255375 MM |
126 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
127 | NETIF_F_TSO6|NETIF_F_UFO) | |
f271b2cc | 128 | struct fasync_struct *fasync; |
14daa021 | 129 | |
f271b2cc | 130 | struct tap_filter txflt; |
33dccbb0 | 131 | struct socket socket; |
43815482 | 132 | struct socket_wq wq; |
d9d52b51 MT |
133 | |
134 | int vnet_hdr_sz; | |
135 | ||
14daa021 RR |
136 | #ifdef TUN_DEBUG |
137 | int debug; | |
1da177e4 | 138 | #endif |
14daa021 | 139 | }; |
1da177e4 | 140 | |
33dccbb0 HX |
141 | struct tun_sock { |
142 | struct sock sk; | |
143 | struct tun_struct *tun; | |
144 | }; | |
145 | ||
146 | static inline struct tun_sock *tun_sk(struct sock *sk) | |
147 | { | |
148 | return container_of(sk, struct tun_sock, sk); | |
149 | } | |
150 | ||
a7385ba2 EB |
151 | static int tun_attach(struct tun_struct *tun, struct file *file) |
152 | { | |
631ab46b | 153 | struct tun_file *tfile = file->private_data; |
38231b7a | 154 | int err; |
a7385ba2 EB |
155 | |
156 | ASSERT_RTNL(); | |
157 | ||
38231b7a EB |
158 | netif_tx_lock_bh(tun->dev); |
159 | ||
160 | err = -EINVAL; | |
161 | if (tfile->tun) | |
162 | goto out; | |
163 | ||
164 | err = -EBUSY; | |
165 | if (tun->tfile) | |
166 | goto out; | |
167 | ||
168 | err = 0; | |
631ab46b EB |
169 | tfile->tun = tun; |
170 | tun->tfile = tfile; | |
05c2828c | 171 | tun->socket.file = file; |
bee31369 | 172 | netif_carrier_on(tun->dev); |
c70f1829 | 173 | dev_hold(tun->dev); |
89f56d1e | 174 | sock_hold(tun->socket.sk); |
c70f1829 | 175 | atomic_inc(&tfile->count); |
a7385ba2 | 176 | |
38231b7a EB |
177 | out: |
178 | netif_tx_unlock_bh(tun->dev); | |
179 | return err; | |
a7385ba2 EB |
180 | } |
181 | ||
631ab46b EB |
182 | static void __tun_detach(struct tun_struct *tun) |
183 | { | |
631ab46b | 184 | /* Detach from net device */ |
38231b7a | 185 | netif_tx_lock_bh(tun->dev); |
bee31369 | 186 | netif_carrier_off(tun->dev); |
631ab46b | 187 | tun->tfile = NULL; |
05c2828c | 188 | tun->socket.file = NULL; |
38231b7a | 189 | netif_tx_unlock_bh(tun->dev); |
631ab46b EB |
190 | |
191 | /* Drop read queue */ | |
89f56d1e | 192 | skb_queue_purge(&tun->socket.sk->sk_receive_queue); |
c70f1829 EB |
193 | |
194 | /* Drop the extra count on the net device */ | |
195 | dev_put(tun->dev); | |
196 | } | |
197 | ||
198 | static void tun_detach(struct tun_struct *tun) | |
199 | { | |
200 | rtnl_lock(); | |
201 | __tun_detach(tun); | |
202 | rtnl_unlock(); | |
631ab46b EB |
203 | } |
204 | ||
205 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
206 | { | |
c70f1829 EB |
207 | struct tun_struct *tun = NULL; |
208 | ||
209 | if (atomic_inc_not_zero(&tfile->count)) | |
210 | tun = tfile->tun; | |
211 | ||
212 | return tun; | |
631ab46b EB |
213 | } |
214 | ||
215 | static struct tun_struct *tun_get(struct file *file) | |
216 | { | |
217 | return __tun_get(file->private_data); | |
218 | } | |
219 | ||
220 | static void tun_put(struct tun_struct *tun) | |
221 | { | |
c70f1829 EB |
222 | struct tun_file *tfile = tun->tfile; |
223 | ||
224 | if (atomic_dec_and_test(&tfile->count)) | |
225 | tun_detach(tfile->tun); | |
631ab46b EB |
226 | } |
227 | ||
6b8a66ee | 228 | /* TAP filtering */ |
f271b2cc MK |
229 | static void addr_hash_set(u32 *mask, const u8 *addr) |
230 | { | |
231 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
232 | mask[n >> 5] |= (1 << (n & 31)); | |
233 | } | |
234 | ||
235 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
236 | { | |
237 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
238 | return mask[n >> 5] & (1 << (n & 31)); | |
239 | } | |
240 | ||
241 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
242 | { | |
243 | struct { u8 u[ETH_ALEN]; } *addr; | |
244 | struct tun_filter uf; | |
245 | int err, alen, n, nexact; | |
246 | ||
247 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
248 | return -EFAULT; | |
249 | ||
250 | if (!uf.count) { | |
251 | /* Disabled */ | |
252 | filter->count = 0; | |
253 | return 0; | |
254 | } | |
255 | ||
256 | alen = ETH_ALEN * uf.count; | |
257 | addr = kmalloc(alen, GFP_KERNEL); | |
258 | if (!addr) | |
259 | return -ENOMEM; | |
260 | ||
261 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
262 | err = -EFAULT; | |
263 | goto done; | |
264 | } | |
265 | ||
266 | /* The filter is updated without holding any locks. Which is | |
267 | * perfectly safe. We disable it first and in the worst | |
268 | * case we'll accept a few undesired packets. */ | |
269 | filter->count = 0; | |
270 | wmb(); | |
271 | ||
272 | /* Use first set of addresses as an exact filter */ | |
273 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
274 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
275 | ||
276 | nexact = n; | |
277 | ||
cfbf84fc AW |
278 | /* Remaining multicast addresses are hashed, |
279 | * unicast will leave the filter disabled. */ | |
f271b2cc | 280 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
281 | for (; n < uf.count; n++) { |
282 | if (!is_multicast_ether_addr(addr[n].u)) { | |
283 | err = 0; /* no filter */ | |
284 | goto done; | |
285 | } | |
f271b2cc | 286 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 287 | } |
f271b2cc MK |
288 | |
289 | /* For ALLMULTI just set the mask to all ones. | |
290 | * This overrides the mask populated above. */ | |
291 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
292 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
293 | ||
294 | /* Now enable the filter */ | |
295 | wmb(); | |
296 | filter->count = nexact; | |
297 | ||
298 | /* Return the number of exact filters */ | |
299 | err = nexact; | |
300 | ||
301 | done: | |
302 | kfree(addr); | |
303 | return err; | |
304 | } | |
305 | ||
306 | /* Returns: 0 - drop, !=0 - accept */ | |
307 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
308 | { | |
309 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
310 | * at this point. */ | |
311 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
312 | int i; | |
313 | ||
314 | /* Exact match */ | |
315 | for (i = 0; i < filter->count; i++) | |
316 | if (!compare_ether_addr(eh->h_dest, filter->addr[i])) | |
317 | return 1; | |
318 | ||
319 | /* Inexact match (multicast only) */ | |
320 | if (is_multicast_ether_addr(eh->h_dest)) | |
321 | return addr_hash_test(filter->mask, eh->h_dest); | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | /* | |
327 | * Checks whether the packet is accepted or not. | |
328 | * Returns: 0 - drop, !=0 - accept | |
329 | */ | |
330 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
331 | { | |
332 | if (!filter->count) | |
333 | return 1; | |
334 | ||
335 | return run_filter(filter, skb); | |
336 | } | |
337 | ||
1da177e4 LT |
338 | /* Network device part of the driver */ |
339 | ||
7282d491 | 340 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 341 | |
c70f1829 EB |
342 | /* Net device detach from fd. */ |
343 | static void tun_net_uninit(struct net_device *dev) | |
344 | { | |
345 | struct tun_struct *tun = netdev_priv(dev); | |
346 | struct tun_file *tfile = tun->tfile; | |
347 | ||
348 | /* Inform the methods they need to stop using the dev. | |
349 | */ | |
350 | if (tfile) { | |
43815482 | 351 | wake_up_all(&tun->wq.wait); |
c70f1829 EB |
352 | if (atomic_dec_and_test(&tfile->count)) |
353 | __tun_detach(tun); | |
354 | } | |
355 | } | |
356 | ||
9c3fea6a HX |
357 | static void tun_free_netdev(struct net_device *dev) |
358 | { | |
359 | struct tun_struct *tun = netdev_priv(dev); | |
360 | ||
1ab5ecb9 | 361 | sk_release_kernel(tun->socket.sk); |
9c3fea6a HX |
362 | } |
363 | ||
1da177e4 LT |
364 | /* Net device open. */ |
365 | static int tun_net_open(struct net_device *dev) | |
366 | { | |
367 | netif_start_queue(dev); | |
368 | return 0; | |
369 | } | |
370 | ||
371 | /* Net device close. */ | |
372 | static int tun_net_close(struct net_device *dev) | |
373 | { | |
374 | netif_stop_queue(dev); | |
375 | return 0; | |
376 | } | |
377 | ||
378 | /* Net device start xmit */ | |
424efe9c | 379 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
380 | { |
381 | struct tun_struct *tun = netdev_priv(dev); | |
382 | ||
6b8a66ee | 383 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
1da177e4 LT |
384 | |
385 | /* Drop packet if interface is not attached */ | |
631ab46b | 386 | if (!tun->tfile) |
1da177e4 LT |
387 | goto drop; |
388 | ||
f271b2cc MK |
389 | /* Drop if the filter does not like it. |
390 | * This is a noop if the filter is disabled. | |
391 | * Filter can be enabled only for the TAP devices. */ | |
392 | if (!check_filter(&tun->txflt, skb)) | |
393 | goto drop; | |
394 | ||
99405162 MT |
395 | if (tun->socket.sk->sk_filter && |
396 | sk_filter(tun->socket.sk, skb)) | |
397 | goto drop; | |
398 | ||
89f56d1e | 399 | if (skb_queue_len(&tun->socket.sk->sk_receive_queue) >= dev->tx_queue_len) { |
1da177e4 LT |
400 | if (!(tun->flags & TUN_ONE_QUEUE)) { |
401 | /* Normal queueing mode. */ | |
402 | /* Packet scheduler handles dropping of further packets. */ | |
403 | netif_stop_queue(dev); | |
404 | ||
405 | /* We won't see all dropped packets individually, so overrun | |
406 | * error is more appropriate. */ | |
09f75cd7 | 407 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
408 | } else { |
409 | /* Single queue mode. | |
410 | * Driver handles dropping of all packets itself. */ | |
411 | goto drop; | |
412 | } | |
413 | } | |
414 | ||
0110d6f2 MT |
415 | /* Orphan the skb - required as we might hang on to it |
416 | * for indefinite time. */ | |
417 | skb_orphan(skb); | |
418 | ||
f271b2cc | 419 | /* Enqueue packet */ |
89f56d1e | 420 | skb_queue_tail(&tun->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
421 | |
422 | /* Notify and wake up reader process */ | |
423 | if (tun->flags & TUN_FASYNC) | |
424 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
43815482 | 425 | wake_up_interruptible_poll(&tun->wq.wait, POLLIN | |
05c2828c | 426 | POLLRDNORM | POLLRDBAND); |
6ed10654 | 427 | return NETDEV_TX_OK; |
1da177e4 LT |
428 | |
429 | drop: | |
09f75cd7 | 430 | dev->stats.tx_dropped++; |
1da177e4 | 431 | kfree_skb(skb); |
6ed10654 | 432 | return NETDEV_TX_OK; |
1da177e4 LT |
433 | } |
434 | ||
f271b2cc | 435 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 436 | { |
f271b2cc MK |
437 | /* |
438 | * This callback is supposed to deal with mc filter in | |
439 | * _rx_ path and has nothing to do with the _tx_ path. | |
440 | * In rx path we always accept everything userspace gives us. | |
441 | */ | |
1da177e4 LT |
442 | } |
443 | ||
4885a504 ES |
444 | #define MIN_MTU 68 |
445 | #define MAX_MTU 65535 | |
446 | ||
447 | static int | |
448 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
449 | { | |
450 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
451 | return -EINVAL; | |
452 | dev->mtu = new_mtu; | |
453 | return 0; | |
454 | } | |
455 | ||
c8f44aff MM |
456 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
457 | netdev_features_t features) | |
88255375 MM |
458 | { |
459 | struct tun_struct *tun = netdev_priv(dev); | |
460 | ||
461 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
462 | } | |
bebd097a NH |
463 | #ifdef CONFIG_NET_POLL_CONTROLLER |
464 | static void tun_poll_controller(struct net_device *dev) | |
465 | { | |
466 | /* | |
467 | * Tun only receives frames when: | |
468 | * 1) the char device endpoint gets data from user space | |
469 | * 2) the tun socket gets a sendmsg call from user space | |
470 | * Since both of those are syncronous operations, we are guaranteed | |
471 | * never to have pending data when we poll for it | |
472 | * so theres nothing to do here but return. | |
473 | * We need this though so netpoll recognizes us as an interface that | |
474 | * supports polling, which enables bridge devices in virt setups to | |
475 | * still use netconsole | |
476 | */ | |
477 | return; | |
478 | } | |
479 | #endif | |
758e43b7 | 480 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 481 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
482 | .ndo_open = tun_net_open, |
483 | .ndo_stop = tun_net_close, | |
00829823 | 484 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 485 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 486 | .ndo_fix_features = tun_net_fix_features, |
bebd097a NH |
487 | #ifdef CONFIG_NET_POLL_CONTROLLER |
488 | .ndo_poll_controller = tun_poll_controller, | |
489 | #endif | |
758e43b7 SH |
490 | }; |
491 | ||
492 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 493 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
494 | .ndo_open = tun_net_open, |
495 | .ndo_stop = tun_net_close, | |
00829823 | 496 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 497 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 498 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 499 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
500 | .ndo_set_mac_address = eth_mac_addr, |
501 | .ndo_validate_addr = eth_validate_addr, | |
bebd097a NH |
502 | #ifdef CONFIG_NET_POLL_CONTROLLER |
503 | .ndo_poll_controller = tun_poll_controller, | |
504 | #endif | |
758e43b7 SH |
505 | }; |
506 | ||
1da177e4 LT |
507 | /* Initialize net device. */ |
508 | static void tun_net_init(struct net_device *dev) | |
509 | { | |
510 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 511 | |
1da177e4 LT |
512 | switch (tun->flags & TUN_TYPE_MASK) { |
513 | case TUN_TUN_DEV: | |
758e43b7 SH |
514 | dev->netdev_ops = &tun_netdev_ops; |
515 | ||
1da177e4 LT |
516 | /* Point-to-Point TUN Device */ |
517 | dev->hard_header_len = 0; | |
518 | dev->addr_len = 0; | |
519 | dev->mtu = 1500; | |
520 | ||
521 | /* Zero header length */ | |
6aa20a22 | 522 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
523 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
524 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
525 | break; | |
526 | ||
527 | case TUN_TAP_DEV: | |
7a0a9608 | 528 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 529 | /* Ethernet TAP Device */ |
1da177e4 | 530 | ether_setup(dev); |
550fd08c | 531 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
36226a8d | 532 | |
f2cedb63 | 533 | eth_hw_addr_random(dev); |
36226a8d | 534 | |
1da177e4 LT |
535 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
536 | break; | |
537 | } | |
538 | } | |
539 | ||
540 | /* Character device part */ | |
541 | ||
542 | /* Poll */ | |
543 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 544 | { |
b2430de3 EB |
545 | struct tun_file *tfile = file->private_data; |
546 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 547 | struct sock *sk; |
33dccbb0 | 548 | unsigned int mask = 0; |
1da177e4 LT |
549 | |
550 | if (!tun) | |
eac9e902 | 551 | return POLLERR; |
1da177e4 | 552 | |
89f56d1e | 553 | sk = tun->socket.sk; |
3c8a9c63 | 554 | |
6b8a66ee | 555 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 556 | |
43815482 | 557 | poll_wait(file, &tun->wq.wait, wait); |
6aa20a22 | 558 | |
89f56d1e | 559 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
560 | mask |= POLLIN | POLLRDNORM; |
561 | ||
33dccbb0 HX |
562 | if (sock_writeable(sk) || |
563 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
564 | sock_writeable(sk))) | |
565 | mask |= POLLOUT | POLLWRNORM; | |
566 | ||
c70f1829 EB |
567 | if (tun->dev->reg_state != NETREG_REGISTERED) |
568 | mask = POLLERR; | |
569 | ||
631ab46b | 570 | tun_put(tun); |
1da177e4 LT |
571 | return mask; |
572 | } | |
573 | ||
f42157cb RR |
574 | /* prepad is the amount to reserve at front. len is length after that. |
575 | * linear is a hint as to how much to copy (usually headers). */ | |
6f7c156c | 576 | static struct sk_buff *tun_alloc_skb(struct tun_struct *tun, |
577 | size_t prepad, size_t len, | |
578 | size_t linear, int noblock) | |
f42157cb | 579 | { |
89f56d1e | 580 | struct sock *sk = tun->socket.sk; |
f42157cb | 581 | struct sk_buff *skb; |
33dccbb0 | 582 | int err; |
f42157cb | 583 | |
82862742 HX |
584 | sock_update_classid(sk); |
585 | ||
f42157cb | 586 | /* Under a page? Don't bother with paged skb. */ |
0eca93bc | 587 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 588 | linear = len; |
f42157cb | 589 | |
33dccbb0 HX |
590 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
591 | &err); | |
f42157cb | 592 | if (!skb) |
33dccbb0 | 593 | return ERR_PTR(err); |
f42157cb RR |
594 | |
595 | skb_reserve(skb, prepad); | |
596 | skb_put(skb, linear); | |
33dccbb0 HX |
597 | skb->data_len = len - linear; |
598 | skb->len += len - linear; | |
f42157cb RR |
599 | |
600 | return skb; | |
601 | } | |
602 | ||
1da177e4 | 603 | /* Get packet from user space buffer */ |
6f7c156c | 604 | static ssize_t tun_get_user(struct tun_struct *tun, |
605 | const struct iovec *iv, size_t count, | |
606 | int noblock) | |
1da177e4 | 607 | { |
09640e63 | 608 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 609 | struct sk_buff *skb; |
a504b86e | 610 | size_t len = count, align = NET_SKB_PAD; |
f43798c2 | 611 | struct virtio_net_hdr gso = { 0 }; |
6f26c9a7 | 612 | int offset = 0; |
1da177e4 LT |
613 | |
614 | if (!(tun->flags & TUN_NO_PI)) { | |
615 | if ((len -= sizeof(pi)) > count) | |
616 | return -EINVAL; | |
617 | ||
6f26c9a7 | 618 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 619 | return -EFAULT; |
6f26c9a7 | 620 | offset += sizeof(pi); |
1da177e4 LT |
621 | } |
622 | ||
f43798c2 | 623 | if (tun->flags & TUN_VNET_HDR) { |
d9d52b51 | 624 | if ((len -= tun->vnet_hdr_sz) > count) |
f43798c2 RR |
625 | return -EINVAL; |
626 | ||
6f26c9a7 | 627 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
628 | return -EFAULT; |
629 | ||
4909122f HX |
630 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
631 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
632 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
633 | ||
f43798c2 RR |
634 | if (gso.hdr_len > len) |
635 | return -EINVAL; | |
d9d52b51 | 636 | offset += tun->vnet_hdr_sz; |
f43798c2 RR |
637 | } |
638 | ||
e01bf1c8 | 639 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
a504b86e | 640 | align += NET_IP_ALIGN; |
0eca93bc HX |
641 | if (unlikely(len < ETH_HLEN || |
642 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
643 | return -EINVAL; |
644 | } | |
6aa20a22 | 645 | |
33dccbb0 HX |
646 | skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock); |
647 | if (IS_ERR(skb)) { | |
648 | if (PTR_ERR(skb) != -EAGAIN) | |
649 | tun->dev->stats.rx_dropped++; | |
650 | return PTR_ERR(skb); | |
1da177e4 LT |
651 | } |
652 | ||
6f26c9a7 | 653 | if (skb_copy_datagram_from_iovec(skb, 0, iv, offset, len)) { |
09f75cd7 | 654 | tun->dev->stats.rx_dropped++; |
8f22757e | 655 | kfree_skb(skb); |
1da177e4 | 656 | return -EFAULT; |
8f22757e | 657 | } |
1da177e4 | 658 | |
f43798c2 RR |
659 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
660 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
661 | gso.csum_offset)) { | |
662 | tun->dev->stats.rx_frame_errors++; | |
663 | kfree_skb(skb); | |
664 | return -EINVAL; | |
665 | } | |
88255375 | 666 | } |
f43798c2 | 667 | |
1da177e4 LT |
668 | switch (tun->flags & TUN_TYPE_MASK) { |
669 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
670 | if (tun->flags & TUN_NO_PI) { |
671 | switch (skb->data[0] & 0xf0) { | |
672 | case 0x40: | |
673 | pi.proto = htons(ETH_P_IP); | |
674 | break; | |
675 | case 0x60: | |
676 | pi.proto = htons(ETH_P_IPV6); | |
677 | break; | |
678 | default: | |
679 | tun->dev->stats.rx_dropped++; | |
680 | kfree_skb(skb); | |
681 | return -EINVAL; | |
682 | } | |
683 | } | |
684 | ||
459a98ed | 685 | skb_reset_mac_header(skb); |
1da177e4 | 686 | skb->protocol = pi.proto; |
4c13eb66 | 687 | skb->dev = tun->dev; |
1da177e4 LT |
688 | break; |
689 | case TUN_TAP_DEV: | |
690 | skb->protocol = eth_type_trans(skb, tun->dev); | |
691 | break; | |
6403eab1 | 692 | } |
1da177e4 | 693 | |
f43798c2 RR |
694 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
695 | pr_debug("GSO!\n"); | |
696 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
697 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
698 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
699 | break; | |
700 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
701 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
702 | break; | |
e36aa25a SS |
703 | case VIRTIO_NET_HDR_GSO_UDP: |
704 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
705 | break; | |
f43798c2 RR |
706 | default: |
707 | tun->dev->stats.rx_frame_errors++; | |
708 | kfree_skb(skb); | |
709 | return -EINVAL; | |
710 | } | |
711 | ||
712 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
713 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
714 | ||
715 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
716 | if (skb_shinfo(skb)->gso_size == 0) { | |
717 | tun->dev->stats.rx_frame_errors++; | |
718 | kfree_skb(skb); | |
719 | return -EINVAL; | |
720 | } | |
721 | ||
722 | /* Header must be checked, and gso_segs computed. */ | |
723 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
724 | skb_shinfo(skb)->gso_segs = 0; | |
725 | } | |
6aa20a22 | 726 | |
1da177e4 | 727 | netif_rx_ni(skb); |
6aa20a22 | 728 | |
09f75cd7 JG |
729 | tun->dev->stats.rx_packets++; |
730 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
731 | |
732 | return count; | |
6aa20a22 | 733 | } |
1da177e4 | 734 | |
ee0b3e67 BP |
735 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
736 | unsigned long count, loff_t pos) | |
1da177e4 | 737 | { |
33dccbb0 | 738 | struct file *file = iocb->ki_filp; |
ab46d779 | 739 | struct tun_struct *tun = tun_get(file); |
631ab46b | 740 | ssize_t result; |
1da177e4 LT |
741 | |
742 | if (!tun) | |
743 | return -EBADFD; | |
744 | ||
6b8a66ee | 745 | tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count); |
1da177e4 | 746 | |
6f26c9a7 | 747 | result = tun_get_user(tun, iv, iov_length(iv, count), |
33dccbb0 | 748 | file->f_flags & O_NONBLOCK); |
631ab46b EB |
749 | |
750 | tun_put(tun); | |
751 | return result; | |
1da177e4 LT |
752 | } |
753 | ||
1da177e4 | 754 | /* Put packet to the user space buffer */ |
6f7c156c | 755 | static ssize_t tun_put_user(struct tun_struct *tun, |
756 | struct sk_buff *skb, | |
757 | const struct iovec *iv, int len) | |
1da177e4 LT |
758 | { |
759 | struct tun_pi pi = { 0, skb->protocol }; | |
760 | ssize_t total = 0; | |
761 | ||
762 | if (!(tun->flags & TUN_NO_PI)) { | |
763 | if ((len -= sizeof(pi)) < 0) | |
764 | return -EINVAL; | |
765 | ||
766 | if (len < skb->len) { | |
767 | /* Packet will be striped */ | |
768 | pi.flags |= TUN_PKT_STRIP; | |
769 | } | |
6aa20a22 | 770 | |
43b39dcd | 771 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
772 | return -EFAULT; |
773 | total += sizeof(pi); | |
6aa20a22 | 774 | } |
1da177e4 | 775 | |
f43798c2 RR |
776 | if (tun->flags & TUN_VNET_HDR) { |
777 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
d9d52b51 | 778 | if ((len -= tun->vnet_hdr_sz) < 0) |
f43798c2 RR |
779 | return -EINVAL; |
780 | ||
781 | if (skb_is_gso(skb)) { | |
782 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
783 | ||
784 | /* This is a hint as to how much should be linear. */ | |
785 | gso.hdr_len = skb_headlen(skb); | |
786 | gso.gso_size = sinfo->gso_size; | |
787 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
788 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
789 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
790 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e36aa25a SS |
791 | else if (sinfo->gso_type & SKB_GSO_UDP) |
792 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
ef3db4a5 | 793 | else { |
6b8a66ee | 794 | pr_err("unexpected GSO type: " |
ef3db4a5 MT |
795 | "0x%x, gso_size %d, hdr_len %d\n", |
796 | sinfo->gso_type, gso.gso_size, | |
797 | gso.hdr_len); | |
798 | print_hex_dump(KERN_ERR, "tun: ", | |
799 | DUMP_PREFIX_NONE, | |
800 | 16, 1, skb->head, | |
801 | min((int)gso.hdr_len, 64), true); | |
802 | WARN_ON_ONCE(1); | |
803 | return -EINVAL; | |
804 | } | |
f43798c2 RR |
805 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
806 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
807 | } else | |
808 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
809 | ||
810 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
811 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 812 | gso.csum_start = skb_checksum_start_offset(skb); |
f43798c2 | 813 | gso.csum_offset = skb->csum_offset; |
10a8d94a JW |
814 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
815 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
f43798c2 RR |
816 | } /* else everything is zero */ |
817 | ||
43b39dcd MT |
818 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
819 | sizeof(gso)))) | |
f43798c2 | 820 | return -EFAULT; |
d9d52b51 | 821 | total += tun->vnet_hdr_sz; |
f43798c2 RR |
822 | } |
823 | ||
1da177e4 LT |
824 | len = min_t(int, skb->len, len); |
825 | ||
43b39dcd | 826 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
05c2828c | 827 | total += skb->len; |
1da177e4 | 828 | |
09f75cd7 JG |
829 | tun->dev->stats.tx_packets++; |
830 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
831 | |
832 | return total; | |
833 | } | |
834 | ||
05c2828c MT |
835 | static ssize_t tun_do_read(struct tun_struct *tun, |
836 | struct kiocb *iocb, const struct iovec *iv, | |
837 | ssize_t len, int noblock) | |
1da177e4 | 838 | { |
1da177e4 LT |
839 | DECLARE_WAITQUEUE(wait, current); |
840 | struct sk_buff *skb; | |
05c2828c | 841 | ssize_t ret = 0; |
1da177e4 | 842 | |
6b8a66ee | 843 | tun_debug(KERN_INFO, tun, "tun_chr_read\n"); |
1da177e4 | 844 | |
61a5ff15 AK |
845 | if (unlikely(!noblock)) |
846 | add_wait_queue(&tun->wq.wait, &wait); | |
1da177e4 | 847 | while (len) { |
1da177e4 LT |
848 | current->state = TASK_INTERRUPTIBLE; |
849 | ||
850 | /* Read frames from the queue */ | |
89f56d1e | 851 | if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) { |
05c2828c | 852 | if (noblock) { |
1da177e4 LT |
853 | ret = -EAGAIN; |
854 | break; | |
855 | } | |
856 | if (signal_pending(current)) { | |
857 | ret = -ERESTARTSYS; | |
858 | break; | |
859 | } | |
c70f1829 EB |
860 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
861 | ret = -EIO; | |
862 | break; | |
863 | } | |
1da177e4 LT |
864 | |
865 | /* Nothing to read, let's sleep */ | |
866 | schedule(); | |
867 | continue; | |
868 | } | |
869 | netif_wake_queue(tun->dev); | |
870 | ||
43b39dcd | 871 | ret = tun_put_user(tun, skb, iv, len); |
f271b2cc MK |
872 | kfree_skb(skb); |
873 | break; | |
1da177e4 LT |
874 | } |
875 | ||
876 | current->state = TASK_RUNNING; | |
61a5ff15 AK |
877 | if (unlikely(!noblock)) |
878 | remove_wait_queue(&tun->wq.wait, &wait); | |
1da177e4 | 879 | |
05c2828c MT |
880 | return ret; |
881 | } | |
882 | ||
883 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
884 | unsigned long count, loff_t pos) | |
885 | { | |
886 | struct file *file = iocb->ki_filp; | |
887 | struct tun_file *tfile = file->private_data; | |
888 | struct tun_struct *tun = __tun_get(tfile); | |
889 | ssize_t len, ret; | |
890 | ||
891 | if (!tun) | |
892 | return -EBADFD; | |
893 | len = iov_length(iv, count); | |
894 | if (len < 0) { | |
895 | ret = -EINVAL; | |
896 | goto out; | |
897 | } | |
898 | ||
899 | ret = tun_do_read(tun, iocb, iv, len, file->f_flags & O_NONBLOCK); | |
900 | ret = min_t(ssize_t, ret, len); | |
631ab46b EB |
901 | out: |
902 | tun_put(tun); | |
1da177e4 LT |
903 | return ret; |
904 | } | |
905 | ||
1da177e4 LT |
906 | static void tun_setup(struct net_device *dev) |
907 | { | |
908 | struct tun_struct *tun = netdev_priv(dev); | |
909 | ||
1da177e4 | 910 | tun->owner = -1; |
8c644623 | 911 | tun->group = -1; |
1da177e4 | 912 | |
1da177e4 | 913 | dev->ethtool_ops = &tun_ethtool_ops; |
9c3fea6a | 914 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
915 | } |
916 | ||
f019a7a5 EB |
917 | /* Trivial set of netlink ops to allow deleting tun or tap |
918 | * device with netlink. | |
919 | */ | |
920 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
921 | { | |
922 | return -EINVAL; | |
923 | } | |
924 | ||
925 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
926 | .kind = DRV_NAME, | |
927 | .priv_size = sizeof(struct tun_struct), | |
928 | .setup = tun_setup, | |
929 | .validate = tun_validate, | |
930 | }; | |
931 | ||
33dccbb0 HX |
932 | static void tun_sock_write_space(struct sock *sk) |
933 | { | |
934 | struct tun_struct *tun; | |
43815482 | 935 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
936 | |
937 | if (!sock_writeable(sk)) | |
938 | return; | |
939 | ||
33dccbb0 HX |
940 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
941 | return; | |
942 | ||
43815482 ED |
943 | wqueue = sk_sleep(sk); |
944 | if (wqueue && waitqueue_active(wqueue)) | |
945 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 946 | POLLWRNORM | POLLWRBAND); |
c722c625 | 947 | |
80924e5f | 948 | tun = tun_sk(sk)->tun; |
33dccbb0 HX |
949 | kill_fasync(&tun->fasync, SIGIO, POLL_OUT); |
950 | } | |
951 | ||
952 | static void tun_sock_destruct(struct sock *sk) | |
953 | { | |
80924e5f | 954 | free_netdev(tun_sk(sk)->tun->dev); |
33dccbb0 HX |
955 | } |
956 | ||
05c2828c MT |
957 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
958 | struct msghdr *m, size_t total_len) | |
959 | { | |
960 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
961 | return tun_get_user(tun, m->msg_iov, total_len, | |
962 | m->msg_flags & MSG_DONTWAIT); | |
963 | } | |
964 | ||
965 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, | |
966 | struct msghdr *m, size_t total_len, | |
967 | int flags) | |
968 | { | |
969 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
970 | int ret; | |
971 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) | |
972 | return -EINVAL; | |
973 | ret = tun_do_read(tun, iocb, m->msg_iov, total_len, | |
974 | flags & MSG_DONTWAIT); | |
975 | if (ret > total_len) { | |
976 | m->msg_flags |= MSG_TRUNC; | |
977 | ret = flags & MSG_TRUNC ? ret : total_len; | |
978 | } | |
979 | return ret; | |
980 | } | |
981 | ||
1ab5ecb9 SK |
982 | static int tun_release(struct socket *sock) |
983 | { | |
984 | if (sock->sk) | |
985 | sock_put(sock->sk); | |
986 | return 0; | |
987 | } | |
988 | ||
05c2828c MT |
989 | /* Ops structure to mimic raw sockets with tun */ |
990 | static const struct proto_ops tun_socket_ops = { | |
991 | .sendmsg = tun_sendmsg, | |
992 | .recvmsg = tun_recvmsg, | |
1ab5ecb9 | 993 | .release = tun_release, |
05c2828c MT |
994 | }; |
995 | ||
33dccbb0 HX |
996 | static struct proto tun_proto = { |
997 | .name = "tun", | |
998 | .owner = THIS_MODULE, | |
999 | .obj_size = sizeof(struct tun_sock), | |
1000 | }; | |
f019a7a5 | 1001 | |
980c9e8c DW |
1002 | static int tun_flags(struct tun_struct *tun) |
1003 | { | |
1004 | int flags = 0; | |
1005 | ||
1006 | if (tun->flags & TUN_TUN_DEV) | |
1007 | flags |= IFF_TUN; | |
1008 | else | |
1009 | flags |= IFF_TAP; | |
1010 | ||
1011 | if (tun->flags & TUN_NO_PI) | |
1012 | flags |= IFF_NO_PI; | |
1013 | ||
1014 | if (tun->flags & TUN_ONE_QUEUE) | |
1015 | flags |= IFF_ONE_QUEUE; | |
1016 | ||
1017 | if (tun->flags & TUN_VNET_HDR) | |
1018 | flags |= IFF_VNET_HDR; | |
1019 | ||
1020 | return flags; | |
1021 | } | |
1022 | ||
1023 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1024 | char *buf) | |
1025 | { | |
1026 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1027 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1028 | } | |
1029 | ||
1030 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1031 | char *buf) | |
1032 | { | |
1033 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1034 | return sprintf(buf, "%d\n", tun->owner); | |
1035 | } | |
1036 | ||
1037 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1038 | char *buf) | |
1039 | { | |
1040 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1041 | return sprintf(buf, "%d\n", tun->group); | |
1042 | } | |
1043 | ||
1044 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1045 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1046 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1047 | ||
d647a591 | 1048 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 | 1049 | { |
33dccbb0 | 1050 | struct sock *sk; |
1da177e4 LT |
1051 | struct tun_struct *tun; |
1052 | struct net_device *dev; | |
1053 | int err; | |
1054 | ||
74a3e5a7 EB |
1055 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1056 | if (dev) { | |
2b980dbd PM |
1057 | const struct cred *cred = current_cred(); |
1058 | ||
f85ba780 DW |
1059 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1060 | return -EBUSY; | |
74a3e5a7 EB |
1061 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1062 | tun = netdev_priv(dev); | |
1063 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1064 | tun = netdev_priv(dev); | |
1065 | else | |
1066 | return -EINVAL; | |
1067 | ||
2b980dbd PM |
1068 | if (((tun->owner != -1 && cred->euid != tun->owner) || |
1069 | (tun->group != -1 && !in_egroup_p(tun->group))) && | |
1070 | !capable(CAP_NET_ADMIN)) | |
1071 | return -EPERM; | |
d7e9660a | 1072 | err = security_tun_dev_attach(tun->socket.sk); |
2b980dbd PM |
1073 | if (err < 0) |
1074 | return err; | |
1075 | ||
a7385ba2 EB |
1076 | err = tun_attach(tun, file); |
1077 | if (err < 0) | |
1078 | return err; | |
6aa20a22 | 1079 | } |
1da177e4 LT |
1080 | else { |
1081 | char *name; | |
1082 | unsigned long flags = 0; | |
1083 | ||
ca6bb5d7 DW |
1084 | if (!capable(CAP_NET_ADMIN)) |
1085 | return -EPERM; | |
2b980dbd PM |
1086 | err = security_tun_dev_create(); |
1087 | if (err < 0) | |
1088 | return err; | |
ca6bb5d7 | 1089 | |
1da177e4 LT |
1090 | /* Set dev type */ |
1091 | if (ifr->ifr_flags & IFF_TUN) { | |
1092 | /* TUN device */ | |
1093 | flags |= TUN_TUN_DEV; | |
1094 | name = "tun%d"; | |
1095 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1096 | /* TAP device */ | |
1097 | flags |= TUN_TAP_DEV; | |
1098 | name = "tap%d"; | |
6aa20a22 | 1099 | } else |
36989b90 | 1100 | return -EINVAL; |
6aa20a22 | 1101 | |
1da177e4 LT |
1102 | if (*ifr->ifr_name) |
1103 | name = ifr->ifr_name; | |
1104 | ||
1105 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
1106 | tun_setup); | |
1107 | if (!dev) | |
1108 | return -ENOMEM; | |
1109 | ||
fc54c658 | 1110 | dev_net_set(dev, net); |
f019a7a5 | 1111 | dev->rtnl_link_ops = &tun_link_ops; |
758e43b7 | 1112 | |
1da177e4 LT |
1113 | tun = netdev_priv(dev); |
1114 | tun->dev = dev; | |
1115 | tun->flags = flags; | |
f271b2cc | 1116 | tun->txflt.count = 0; |
d9d52b51 | 1117 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
1da177e4 | 1118 | |
33dccbb0 | 1119 | err = -ENOMEM; |
1ab5ecb9 | 1120 | sk = sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL, &tun_proto); |
33dccbb0 HX |
1121 | if (!sk) |
1122 | goto err_free_dev; | |
1123 | ||
1ab5ecb9 | 1124 | sk_change_net(sk, net); |
43815482 ED |
1125 | tun->socket.wq = &tun->wq; |
1126 | init_waitqueue_head(&tun->wq.wait); | |
05c2828c | 1127 | tun->socket.ops = &tun_socket_ops; |
33dccbb0 HX |
1128 | sock_init_data(&tun->socket, sk); |
1129 | sk->sk_write_space = tun_sock_write_space; | |
33dccbb0 | 1130 | sk->sk_sndbuf = INT_MAX; |
33dccbb0 | 1131 | |
80924e5f | 1132 | tun_sk(sk)->tun = tun; |
33dccbb0 | 1133 | |
2b980dbd PM |
1134 | security_tun_dev_post_create(sk); |
1135 | ||
1da177e4 LT |
1136 | tun_net_init(dev); |
1137 | ||
88255375 MM |
1138 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
1139 | TUN_USER_FEATURES; | |
1140 | dev->features = dev->hw_features; | |
1141 | ||
1da177e4 LT |
1142 | err = register_netdevice(tun->dev); |
1143 | if (err < 0) | |
9c3fea6a HX |
1144 | goto err_free_sk; |
1145 | ||
980c9e8c DW |
1146 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1147 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1148 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
6b8a66ee | 1149 | pr_err("Failed to create tun sysfs files\n"); |
980c9e8c | 1150 | |
9c3fea6a | 1151 | sk->sk_destruct = tun_sock_destruct; |
a7385ba2 EB |
1152 | |
1153 | err = tun_attach(tun, file); | |
1154 | if (err < 0) | |
9c3fea6a | 1155 | goto failed; |
1da177e4 LT |
1156 | } |
1157 | ||
6b8a66ee | 1158 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 LT |
1159 | |
1160 | if (ifr->ifr_flags & IFF_NO_PI) | |
1161 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1162 | else |
1163 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
1164 | |
1165 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
1166 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1167 | else |
1168 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1169 | |
f43798c2 RR |
1170 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1171 | tun->flags |= TUN_VNET_HDR; | |
1172 | else | |
1173 | tun->flags &= ~TUN_VNET_HDR; | |
1174 | ||
e35259a9 MK |
1175 | /* Make sure persistent devices do not get stuck in |
1176 | * xoff state. | |
1177 | */ | |
1178 | if (netif_running(tun->dev)) | |
1179 | netif_wake_queue(tun->dev); | |
1180 | ||
1da177e4 LT |
1181 | strcpy(ifr->ifr_name, tun->dev->name); |
1182 | return 0; | |
1183 | ||
33dccbb0 | 1184 | err_free_sk: |
1ab5ecb9 | 1185 | tun_free_netdev(dev); |
1da177e4 LT |
1186 | err_free_dev: |
1187 | free_netdev(dev); | |
1188 | failed: | |
1189 | return err; | |
1190 | } | |
1191 | ||
876bfd4d HX |
1192 | static int tun_get_iff(struct net *net, struct tun_struct *tun, |
1193 | struct ifreq *ifr) | |
e3b99556 | 1194 | { |
6b8a66ee | 1195 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1196 | |
1197 | strcpy(ifr->ifr_name, tun->dev->name); | |
1198 | ||
980c9e8c | 1199 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 MM |
1200 | |
1201 | return 0; | |
1202 | } | |
1203 | ||
5228ddc9 RR |
1204 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1205 | * privs required. */ | |
88255375 | 1206 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1207 | { |
c8f44aff | 1208 | netdev_features_t features = 0; |
5228ddc9 RR |
1209 | |
1210 | if (arg & TUN_F_CSUM) { | |
88255375 | 1211 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1212 | arg &= ~TUN_F_CSUM; |
1213 | ||
1214 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1215 | if (arg & TUN_F_TSO_ECN) { | |
1216 | features |= NETIF_F_TSO_ECN; | |
1217 | arg &= ~TUN_F_TSO_ECN; | |
1218 | } | |
1219 | if (arg & TUN_F_TSO4) | |
1220 | features |= NETIF_F_TSO; | |
1221 | if (arg & TUN_F_TSO6) | |
1222 | features |= NETIF_F_TSO6; | |
1223 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1224 | } | |
e36aa25a SS |
1225 | |
1226 | if (arg & TUN_F_UFO) { | |
1227 | features |= NETIF_F_UFO; | |
1228 | arg &= ~TUN_F_UFO; | |
1229 | } | |
5228ddc9 RR |
1230 | } |
1231 | ||
1232 | /* This gives the user a way to test for new features in future by | |
1233 | * trying to set them. */ | |
1234 | if (arg) | |
1235 | return -EINVAL; | |
1236 | ||
88255375 MM |
1237 | tun->set_features = features; |
1238 | netdev_update_features(tun->dev); | |
5228ddc9 RR |
1239 | |
1240 | return 0; | |
1241 | } | |
1242 | ||
50857e2a AB |
1243 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1244 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1245 | { |
36b50bab | 1246 | struct tun_file *tfile = file->private_data; |
631ab46b | 1247 | struct tun_struct *tun; |
1da177e4 | 1248 | void __user* argp = (void __user*)arg; |
99405162 | 1249 | struct sock_fprog fprog; |
1da177e4 | 1250 | struct ifreq ifr; |
33dccbb0 | 1251 | int sndbuf; |
d9d52b51 | 1252 | int vnet_hdr_sz; |
f271b2cc | 1253 | int ret; |
1da177e4 LT |
1254 | |
1255 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
50857e2a | 1256 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 LT |
1257 | return -EFAULT; |
1258 | ||
631ab46b EB |
1259 | if (cmd == TUNGETFEATURES) { |
1260 | /* Currently this just means: "what IFF flags are valid?". | |
1261 | * This is needed because we never checked for invalid flags on | |
1262 | * TUNSETIFF. */ | |
1263 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
1264 | IFF_VNET_HDR, | |
1265 | (unsigned int __user*)argp); | |
1266 | } | |
1267 | ||
876bfd4d HX |
1268 | rtnl_lock(); |
1269 | ||
36b50bab | 1270 | tun = __tun_get(tfile); |
1da177e4 | 1271 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1272 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1273 | ||
876bfd4d | 1274 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1275 | |
876bfd4d HX |
1276 | if (ret) |
1277 | goto unlock; | |
1da177e4 | 1278 | |
50857e2a | 1279 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1280 | ret = -EFAULT; |
1281 | goto unlock; | |
1da177e4 LT |
1282 | } |
1283 | ||
876bfd4d | 1284 | ret = -EBADFD; |
1da177e4 | 1285 | if (!tun) |
876bfd4d | 1286 | goto unlock; |
1da177e4 | 1287 | |
6b8a66ee | 1288 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %d\n", cmd); |
1da177e4 | 1289 | |
631ab46b | 1290 | ret = 0; |
1da177e4 | 1291 | switch (cmd) { |
e3b99556 | 1292 | case TUNGETIFF: |
876bfd4d | 1293 | ret = tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1294 | if (ret) |
631ab46b | 1295 | break; |
e3b99556 | 1296 | |
50857e2a | 1297 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1298 | ret = -EFAULT; |
e3b99556 MM |
1299 | break; |
1300 | ||
1da177e4 LT |
1301 | case TUNSETNOCSUM: |
1302 | /* Disable/Enable checksum */ | |
1da177e4 | 1303 | |
88255375 MM |
1304 | /* [unimplemented] */ |
1305 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 1306 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
1307 | break; |
1308 | ||
1309 | case TUNSETPERSIST: | |
1310 | /* Disable/Enable persist mode */ | |
1311 | if (arg) | |
1312 | tun->flags |= TUN_PERSIST; | |
1313 | else | |
1314 | tun->flags &= ~TUN_PERSIST; | |
1315 | ||
6b8a66ee JP |
1316 | tun_debug(KERN_INFO, tun, "persist %s\n", |
1317 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
1318 | break; |
1319 | ||
1320 | case TUNSETOWNER: | |
1321 | /* Set owner of the device */ | |
1322 | tun->owner = (uid_t) arg; | |
1323 | ||
6b8a66ee | 1324 | tun_debug(KERN_INFO, tun, "owner set to %d\n", tun->owner); |
1da177e4 LT |
1325 | break; |
1326 | ||
8c644623 GG |
1327 | case TUNSETGROUP: |
1328 | /* Set group of the device */ | |
1329 | tun->group= (gid_t) arg; | |
1330 | ||
6b8a66ee | 1331 | tun_debug(KERN_INFO, tun, "group set to %d\n", tun->group); |
8c644623 GG |
1332 | break; |
1333 | ||
ff4cc3ac MK |
1334 | case TUNSETLINK: |
1335 | /* Only allow setting the type when the interface is down */ | |
1336 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
1337 | tun_debug(KERN_INFO, tun, |
1338 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 1339 | ret = -EBUSY; |
ff4cc3ac MK |
1340 | } else { |
1341 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
1342 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
1343 | tun->dev->type); | |
48abfe05 | 1344 | ret = 0; |
ff4cc3ac | 1345 | } |
631ab46b | 1346 | break; |
ff4cc3ac | 1347 | |
1da177e4 LT |
1348 | #ifdef TUN_DEBUG |
1349 | case TUNSETDEBUG: | |
1350 | tun->debug = arg; | |
1351 | break; | |
1352 | #endif | |
5228ddc9 | 1353 | case TUNSETOFFLOAD: |
88255375 | 1354 | ret = set_offload(tun, arg); |
631ab46b | 1355 | break; |
5228ddc9 | 1356 | |
f271b2cc MK |
1357 | case TUNSETTXFILTER: |
1358 | /* Can be set only for TAPs */ | |
631ab46b | 1359 | ret = -EINVAL; |
f271b2cc | 1360 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 1361 | break; |
c0e5a8c2 | 1362 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 1363 | break; |
1da177e4 LT |
1364 | |
1365 | case SIOCGIFHWADDR: | |
b595076a | 1366 | /* Get hw address */ |
f271b2cc MK |
1367 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
1368 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 1369 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
1370 | ret = -EFAULT; |
1371 | break; | |
1da177e4 LT |
1372 | |
1373 | case SIOCSIFHWADDR: | |
f271b2cc | 1374 | /* Set hw address */ |
6b8a66ee JP |
1375 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
1376 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 1377 | |
40102371 | 1378 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 1379 | break; |
33dccbb0 HX |
1380 | |
1381 | case TUNGETSNDBUF: | |
89f56d1e | 1382 | sndbuf = tun->socket.sk->sk_sndbuf; |
33dccbb0 HX |
1383 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
1384 | ret = -EFAULT; | |
1385 | break; | |
1386 | ||
1387 | case TUNSETSNDBUF: | |
1388 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
1389 | ret = -EFAULT; | |
1390 | break; | |
1391 | } | |
1392 | ||
89f56d1e | 1393 | tun->socket.sk->sk_sndbuf = sndbuf; |
33dccbb0 HX |
1394 | break; |
1395 | ||
d9d52b51 MT |
1396 | case TUNGETVNETHDRSZ: |
1397 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
1398 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
1399 | ret = -EFAULT; | |
1400 | break; | |
1401 | ||
1402 | case TUNSETVNETHDRSZ: | |
1403 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
1404 | ret = -EFAULT; | |
1405 | break; | |
1406 | } | |
1407 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
1408 | ret = -EINVAL; | |
1409 | break; | |
1410 | } | |
1411 | ||
1412 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
1413 | break; | |
1414 | ||
99405162 MT |
1415 | case TUNATTACHFILTER: |
1416 | /* Can be set only for TAPs */ | |
1417 | ret = -EINVAL; | |
1418 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1419 | break; | |
1420 | ret = -EFAULT; | |
1421 | if (copy_from_user(&fprog, argp, sizeof(fprog))) | |
1422 | break; | |
1423 | ||
1424 | ret = sk_attach_filter(&fprog, tun->socket.sk); | |
1425 | break; | |
1426 | ||
1427 | case TUNDETACHFILTER: | |
1428 | /* Can be set only for TAPs */ | |
1429 | ret = -EINVAL; | |
1430 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1431 | break; | |
1432 | ret = sk_detach_filter(tun->socket.sk); | |
1433 | break; | |
1434 | ||
1da177e4 | 1435 | default: |
631ab46b EB |
1436 | ret = -EINVAL; |
1437 | break; | |
ee289b64 | 1438 | } |
1da177e4 | 1439 | |
876bfd4d HX |
1440 | unlock: |
1441 | rtnl_unlock(); | |
1442 | if (tun) | |
1443 | tun_put(tun); | |
631ab46b | 1444 | return ret; |
1da177e4 LT |
1445 | } |
1446 | ||
50857e2a AB |
1447 | static long tun_chr_ioctl(struct file *file, |
1448 | unsigned int cmd, unsigned long arg) | |
1449 | { | |
1450 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
1451 | } | |
1452 | ||
1453 | #ifdef CONFIG_COMPAT | |
1454 | static long tun_chr_compat_ioctl(struct file *file, | |
1455 | unsigned int cmd, unsigned long arg) | |
1456 | { | |
1457 | switch (cmd) { | |
1458 | case TUNSETIFF: | |
1459 | case TUNGETIFF: | |
1460 | case TUNSETTXFILTER: | |
1461 | case TUNGETSNDBUF: | |
1462 | case TUNSETSNDBUF: | |
1463 | case SIOCGIFHWADDR: | |
1464 | case SIOCSIFHWADDR: | |
1465 | arg = (unsigned long)compat_ptr(arg); | |
1466 | break; | |
1467 | default: | |
1468 | arg = (compat_ulong_t)arg; | |
1469 | break; | |
1470 | } | |
1471 | ||
1472 | /* | |
1473 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
1474 | * the end of that structure. All fields that are used in this | |
1475 | * driver are compatible though, we don't need to convert the | |
1476 | * contents. | |
1477 | */ | |
1478 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
1479 | } | |
1480 | #endif /* CONFIG_COMPAT */ | |
1481 | ||
1da177e4 LT |
1482 | static int tun_chr_fasync(int fd, struct file *file, int on) |
1483 | { | |
631ab46b | 1484 | struct tun_struct *tun = tun_get(file); |
1da177e4 LT |
1485 | int ret; |
1486 | ||
1487 | if (!tun) | |
1488 | return -EBADFD; | |
1489 | ||
6b8a66ee | 1490 | tun_debug(KERN_INFO, tun, "tun_chr_fasync %d\n", on); |
1da177e4 LT |
1491 | |
1492 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
9d319522 | 1493 | goto out; |
6aa20a22 | 1494 | |
1da177e4 | 1495 | if (on) { |
609d7fa9 | 1496 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 1497 | if (ret) |
9d319522 | 1498 | goto out; |
1da177e4 | 1499 | tun->flags |= TUN_FASYNC; |
6aa20a22 | 1500 | } else |
1da177e4 | 1501 | tun->flags &= ~TUN_FASYNC; |
9d319522 JC |
1502 | ret = 0; |
1503 | out: | |
631ab46b | 1504 | tun_put(tun); |
9d319522 | 1505 | return ret; |
1da177e4 LT |
1506 | } |
1507 | ||
1508 | static int tun_chr_open(struct inode *inode, struct file * file) | |
1509 | { | |
631ab46b | 1510 | struct tun_file *tfile; |
deed49fb | 1511 | |
6b8a66ee | 1512 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b EB |
1513 | |
1514 | tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); | |
1515 | if (!tfile) | |
1516 | return -ENOMEM; | |
c70f1829 | 1517 | atomic_set(&tfile->count, 0); |
631ab46b | 1518 | tfile->tun = NULL; |
36b50bab | 1519 | tfile->net = get_net(current->nsproxy->net_ns); |
631ab46b | 1520 | file->private_data = tfile; |
1da177e4 LT |
1521 | return 0; |
1522 | } | |
1523 | ||
1524 | static int tun_chr_close(struct inode *inode, struct file *file) | |
1525 | { | |
631ab46b | 1526 | struct tun_file *tfile = file->private_data; |
f0a4d0e5 | 1527 | struct tun_struct *tun; |
1da177e4 | 1528 | |
f0a4d0e5 | 1529 | tun = __tun_get(tfile); |
631ab46b | 1530 | if (tun) { |
d23e4365 HX |
1531 | struct net_device *dev = tun->dev; |
1532 | ||
6b8a66ee | 1533 | tun_debug(KERN_INFO, tun, "tun_chr_close\n"); |
1da177e4 | 1534 | |
631ab46b | 1535 | __tun_detach(tun); |
1da177e4 | 1536 | |
3ad2f3fb | 1537 | /* If desirable, unregister the netdevice. */ |
d23e4365 HX |
1538 | if (!(tun->flags & TUN_PERSIST)) { |
1539 | rtnl_lock(); | |
1540 | if (dev->reg_state == NETREG_REGISTERED) | |
1541 | unregister_netdevice(dev); | |
1542 | rtnl_unlock(); | |
1543 | } | |
631ab46b | 1544 | } |
1da177e4 | 1545 | |
9c3fea6a HX |
1546 | tun = tfile->tun; |
1547 | if (tun) | |
89f56d1e | 1548 | sock_put(tun->socket.sk); |
9c3fea6a | 1549 | |
36b50bab | 1550 | put_net(tfile->net); |
631ab46b | 1551 | kfree(tfile); |
1da177e4 LT |
1552 | |
1553 | return 0; | |
1554 | } | |
1555 | ||
d54b1fdb | 1556 | static const struct file_operations tun_fops = { |
6aa20a22 | 1557 | .owner = THIS_MODULE, |
1da177e4 | 1558 | .llseek = no_llseek, |
ee0b3e67 BP |
1559 | .read = do_sync_read, |
1560 | .aio_read = tun_chr_aio_read, | |
1561 | .write = do_sync_write, | |
1562 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 1563 | .poll = tun_chr_poll, |
50857e2a AB |
1564 | .unlocked_ioctl = tun_chr_ioctl, |
1565 | #ifdef CONFIG_COMPAT | |
1566 | .compat_ioctl = tun_chr_compat_ioctl, | |
1567 | #endif | |
1da177e4 LT |
1568 | .open = tun_chr_open, |
1569 | .release = tun_chr_close, | |
6aa20a22 | 1570 | .fasync = tun_chr_fasync |
1da177e4 LT |
1571 | }; |
1572 | ||
1573 | static struct miscdevice tun_miscdev = { | |
1574 | .minor = TUN_MINOR, | |
1575 | .name = "tun", | |
e454cea2 | 1576 | .nodename = "net/tun", |
1da177e4 | 1577 | .fops = &tun_fops, |
1da177e4 LT |
1578 | }; |
1579 | ||
1580 | /* ethtool interface */ | |
1581 | ||
1582 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1583 | { | |
1584 | cmd->supported = 0; | |
1585 | cmd->advertising = 0; | |
70739497 | 1586 | ethtool_cmd_speed_set(cmd, SPEED_10); |
1da177e4 LT |
1587 | cmd->duplex = DUPLEX_FULL; |
1588 | cmd->port = PORT_TP; | |
1589 | cmd->phy_address = 0; | |
1590 | cmd->transceiver = XCVR_INTERNAL; | |
1591 | cmd->autoneg = AUTONEG_DISABLE; | |
1592 | cmd->maxtxpkt = 0; | |
1593 | cmd->maxrxpkt = 0; | |
1594 | return 0; | |
1595 | } | |
1596 | ||
1597 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
1598 | { | |
1599 | struct tun_struct *tun = netdev_priv(dev); | |
1600 | ||
33a5ba14 RJ |
1601 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
1602 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
1603 | |
1604 | switch (tun->flags & TUN_TYPE_MASK) { | |
1605 | case TUN_TUN_DEV: | |
33a5ba14 | 1606 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 LT |
1607 | break; |
1608 | case TUN_TAP_DEV: | |
33a5ba14 | 1609 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
1610 | break; |
1611 | } | |
1612 | } | |
1613 | ||
1614 | static u32 tun_get_msglevel(struct net_device *dev) | |
1615 | { | |
1616 | #ifdef TUN_DEBUG | |
1617 | struct tun_struct *tun = netdev_priv(dev); | |
1618 | return tun->debug; | |
1619 | #else | |
1620 | return -EOPNOTSUPP; | |
1621 | #endif | |
1622 | } | |
1623 | ||
1624 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
1625 | { | |
1626 | #ifdef TUN_DEBUG | |
1627 | struct tun_struct *tun = netdev_priv(dev); | |
1628 | tun->debug = value; | |
1629 | #endif | |
1630 | } | |
1631 | ||
7282d491 | 1632 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
1633 | .get_settings = tun_get_settings, |
1634 | .get_drvinfo = tun_get_drvinfo, | |
1635 | .get_msglevel = tun_get_msglevel, | |
1636 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 1637 | .get_link = ethtool_op_get_link, |
1da177e4 LT |
1638 | }; |
1639 | ||
79d17604 | 1640 | |
1da177e4 LT |
1641 | static int __init tun_init(void) |
1642 | { | |
1643 | int ret = 0; | |
1644 | ||
6b8a66ee JP |
1645 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
1646 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 1647 | |
f019a7a5 | 1648 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 1649 | if (ret) { |
6b8a66ee | 1650 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 1651 | goto err_linkops; |
79d17604 PE |
1652 | } |
1653 | ||
1da177e4 | 1654 | ret = misc_register(&tun_miscdev); |
79d17604 | 1655 | if (ret) { |
6b8a66ee | 1656 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
1657 | goto err_misc; |
1658 | } | |
f019a7a5 | 1659 | return 0; |
79d17604 | 1660 | err_misc: |
f019a7a5 EB |
1661 | rtnl_link_unregister(&tun_link_ops); |
1662 | err_linkops: | |
1da177e4 LT |
1663 | return ret; |
1664 | } | |
1665 | ||
1666 | static void tun_cleanup(void) | |
1667 | { | |
6aa20a22 | 1668 | misc_deregister(&tun_miscdev); |
f019a7a5 | 1669 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
1670 | } |
1671 | ||
05c2828c MT |
1672 | /* Get an underlying socket object from tun file. Returns error unless file is |
1673 | * attached to a device. The returned object works like a packet socket, it | |
1674 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
1675 | * holding a reference to the file for as long as the socket is in use. */ | |
1676 | struct socket *tun_get_socket(struct file *file) | |
1677 | { | |
1678 | struct tun_struct *tun; | |
1679 | if (file->f_op != &tun_fops) | |
1680 | return ERR_PTR(-EINVAL); | |
1681 | tun = tun_get(file); | |
1682 | if (!tun) | |
1683 | return ERR_PTR(-EBADFD); | |
1684 | tun_put(tun); | |
1685 | return &tun->socket; | |
1686 | } | |
1687 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
1688 | ||
1da177e4 LT |
1689 | module_init(tun_init); |
1690 | module_exit(tun_cleanup); | |
1691 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1692 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1693 | MODULE_LICENSE("GPL"); | |
1694 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 1695 | MODULE_ALIAS("devname:net/tun"); |