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> |
344dc8ed | 25 | * Use eth_random_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 | ||
0690899b MT |
103 | #define GOODCOPY_LEN 128 |
104 | ||
f271b2cc MK |
105 | #define FLT_EXACT_COUNT 8 |
106 | struct tap_filter { | |
107 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
108 | u32 mask[2]; /* Mask of the hashed addrs */ | |
109 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
110 | }; | |
111 | ||
631ab46b | 112 | struct tun_file { |
c70f1829 | 113 | atomic_t count; |
631ab46b | 114 | struct tun_struct *tun; |
36b50bab | 115 | struct net *net; |
631ab46b EB |
116 | }; |
117 | ||
33dccbb0 HX |
118 | struct tun_sock; |
119 | ||
14daa021 | 120 | struct tun_struct { |
631ab46b | 121 | struct tun_file *tfile; |
f271b2cc | 122 | unsigned int flags; |
14daa021 RR |
123 | uid_t owner; |
124 | gid_t group; | |
125 | ||
14daa021 | 126 | struct net_device *dev; |
c8f44aff | 127 | netdev_features_t set_features; |
88255375 MM |
128 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
129 | NETIF_F_TSO6|NETIF_F_UFO) | |
f271b2cc | 130 | struct fasync_struct *fasync; |
14daa021 | 131 | |
f271b2cc | 132 | struct tap_filter txflt; |
33dccbb0 | 133 | struct socket socket; |
43815482 | 134 | struct socket_wq wq; |
d9d52b51 MT |
135 | |
136 | int vnet_hdr_sz; | |
137 | ||
14daa021 RR |
138 | #ifdef TUN_DEBUG |
139 | int debug; | |
1da177e4 | 140 | #endif |
14daa021 | 141 | }; |
1da177e4 | 142 | |
33dccbb0 HX |
143 | struct tun_sock { |
144 | struct sock sk; | |
145 | struct tun_struct *tun; | |
146 | }; | |
147 | ||
148 | static inline struct tun_sock *tun_sk(struct sock *sk) | |
149 | { | |
150 | return container_of(sk, struct tun_sock, sk); | |
151 | } | |
152 | ||
a7385ba2 EB |
153 | static int tun_attach(struct tun_struct *tun, struct file *file) |
154 | { | |
631ab46b | 155 | struct tun_file *tfile = file->private_data; |
38231b7a | 156 | int err; |
a7385ba2 EB |
157 | |
158 | ASSERT_RTNL(); | |
159 | ||
38231b7a EB |
160 | netif_tx_lock_bh(tun->dev); |
161 | ||
162 | err = -EINVAL; | |
163 | if (tfile->tun) | |
164 | goto out; | |
165 | ||
166 | err = -EBUSY; | |
167 | if (tun->tfile) | |
168 | goto out; | |
169 | ||
170 | err = 0; | |
631ab46b EB |
171 | tfile->tun = tun; |
172 | tun->tfile = tfile; | |
05c2828c | 173 | tun->socket.file = file; |
bee31369 | 174 | netif_carrier_on(tun->dev); |
c70f1829 | 175 | dev_hold(tun->dev); |
89f56d1e | 176 | sock_hold(tun->socket.sk); |
c70f1829 | 177 | atomic_inc(&tfile->count); |
a7385ba2 | 178 | |
38231b7a EB |
179 | out: |
180 | netif_tx_unlock_bh(tun->dev); | |
181 | return err; | |
a7385ba2 EB |
182 | } |
183 | ||
631ab46b EB |
184 | static void __tun_detach(struct tun_struct *tun) |
185 | { | |
631ab46b | 186 | /* Detach from net device */ |
38231b7a | 187 | netif_tx_lock_bh(tun->dev); |
bee31369 | 188 | netif_carrier_off(tun->dev); |
631ab46b | 189 | tun->tfile = NULL; |
05c2828c | 190 | tun->socket.file = NULL; |
38231b7a | 191 | netif_tx_unlock_bh(tun->dev); |
631ab46b EB |
192 | |
193 | /* Drop read queue */ | |
89f56d1e | 194 | skb_queue_purge(&tun->socket.sk->sk_receive_queue); |
c70f1829 EB |
195 | |
196 | /* Drop the extra count on the net device */ | |
197 | dev_put(tun->dev); | |
198 | } | |
199 | ||
200 | static void tun_detach(struct tun_struct *tun) | |
201 | { | |
202 | rtnl_lock(); | |
203 | __tun_detach(tun); | |
204 | rtnl_unlock(); | |
631ab46b EB |
205 | } |
206 | ||
207 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
208 | { | |
c70f1829 EB |
209 | struct tun_struct *tun = NULL; |
210 | ||
211 | if (atomic_inc_not_zero(&tfile->count)) | |
212 | tun = tfile->tun; | |
213 | ||
214 | return tun; | |
631ab46b EB |
215 | } |
216 | ||
217 | static struct tun_struct *tun_get(struct file *file) | |
218 | { | |
219 | return __tun_get(file->private_data); | |
220 | } | |
221 | ||
222 | static void tun_put(struct tun_struct *tun) | |
223 | { | |
c70f1829 EB |
224 | struct tun_file *tfile = tun->tfile; |
225 | ||
226 | if (atomic_dec_and_test(&tfile->count)) | |
227 | tun_detach(tfile->tun); | |
631ab46b EB |
228 | } |
229 | ||
6b8a66ee | 230 | /* TAP filtering */ |
f271b2cc MK |
231 | static void addr_hash_set(u32 *mask, const u8 *addr) |
232 | { | |
233 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
234 | mask[n >> 5] |= (1 << (n & 31)); | |
235 | } | |
236 | ||
237 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
238 | { | |
239 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
240 | return mask[n >> 5] & (1 << (n & 31)); | |
241 | } | |
242 | ||
243 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
244 | { | |
245 | struct { u8 u[ETH_ALEN]; } *addr; | |
246 | struct tun_filter uf; | |
247 | int err, alen, n, nexact; | |
248 | ||
249 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
250 | return -EFAULT; | |
251 | ||
252 | if (!uf.count) { | |
253 | /* Disabled */ | |
254 | filter->count = 0; | |
255 | return 0; | |
256 | } | |
257 | ||
258 | alen = ETH_ALEN * uf.count; | |
259 | addr = kmalloc(alen, GFP_KERNEL); | |
260 | if (!addr) | |
261 | return -ENOMEM; | |
262 | ||
263 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
264 | err = -EFAULT; | |
265 | goto done; | |
266 | } | |
267 | ||
268 | /* The filter is updated without holding any locks. Which is | |
269 | * perfectly safe. We disable it first and in the worst | |
270 | * case we'll accept a few undesired packets. */ | |
271 | filter->count = 0; | |
272 | wmb(); | |
273 | ||
274 | /* Use first set of addresses as an exact filter */ | |
275 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
276 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
277 | ||
278 | nexact = n; | |
279 | ||
cfbf84fc AW |
280 | /* Remaining multicast addresses are hashed, |
281 | * unicast will leave the filter disabled. */ | |
f271b2cc | 282 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
283 | for (; n < uf.count; n++) { |
284 | if (!is_multicast_ether_addr(addr[n].u)) { | |
285 | err = 0; /* no filter */ | |
286 | goto done; | |
287 | } | |
f271b2cc | 288 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 289 | } |
f271b2cc MK |
290 | |
291 | /* For ALLMULTI just set the mask to all ones. | |
292 | * This overrides the mask populated above. */ | |
293 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
294 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
295 | ||
296 | /* Now enable the filter */ | |
297 | wmb(); | |
298 | filter->count = nexact; | |
299 | ||
300 | /* Return the number of exact filters */ | |
301 | err = nexact; | |
302 | ||
303 | done: | |
304 | kfree(addr); | |
305 | return err; | |
306 | } | |
307 | ||
308 | /* Returns: 0 - drop, !=0 - accept */ | |
309 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
310 | { | |
311 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
312 | * at this point. */ | |
313 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
314 | int i; | |
315 | ||
316 | /* Exact match */ | |
317 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 318 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
319 | return 1; |
320 | ||
321 | /* Inexact match (multicast only) */ | |
322 | if (is_multicast_ether_addr(eh->h_dest)) | |
323 | return addr_hash_test(filter->mask, eh->h_dest); | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | /* | |
329 | * Checks whether the packet is accepted or not. | |
330 | * Returns: 0 - drop, !=0 - accept | |
331 | */ | |
332 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
333 | { | |
334 | if (!filter->count) | |
335 | return 1; | |
336 | ||
337 | return run_filter(filter, skb); | |
338 | } | |
339 | ||
1da177e4 LT |
340 | /* Network device part of the driver */ |
341 | ||
7282d491 | 342 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 343 | |
c70f1829 EB |
344 | /* Net device detach from fd. */ |
345 | static void tun_net_uninit(struct net_device *dev) | |
346 | { | |
347 | struct tun_struct *tun = netdev_priv(dev); | |
348 | struct tun_file *tfile = tun->tfile; | |
349 | ||
350 | /* Inform the methods they need to stop using the dev. | |
351 | */ | |
352 | if (tfile) { | |
43815482 | 353 | wake_up_all(&tun->wq.wait); |
c70f1829 EB |
354 | if (atomic_dec_and_test(&tfile->count)) |
355 | __tun_detach(tun); | |
356 | } | |
357 | } | |
358 | ||
9c3fea6a HX |
359 | static void tun_free_netdev(struct net_device *dev) |
360 | { | |
361 | struct tun_struct *tun = netdev_priv(dev); | |
362 | ||
b09e786b MP |
363 | BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED, &tun->socket.flags)); |
364 | ||
1ab5ecb9 | 365 | sk_release_kernel(tun->socket.sk); |
9c3fea6a HX |
366 | } |
367 | ||
1da177e4 LT |
368 | /* Net device open. */ |
369 | static int tun_net_open(struct net_device *dev) | |
370 | { | |
371 | netif_start_queue(dev); | |
372 | return 0; | |
373 | } | |
374 | ||
375 | /* Net device close. */ | |
376 | static int tun_net_close(struct net_device *dev) | |
377 | { | |
378 | netif_stop_queue(dev); | |
379 | return 0; | |
380 | } | |
381 | ||
382 | /* Net device start xmit */ | |
424efe9c | 383 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
384 | { |
385 | struct tun_struct *tun = netdev_priv(dev); | |
386 | ||
6b8a66ee | 387 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
1da177e4 LT |
388 | |
389 | /* Drop packet if interface is not attached */ | |
631ab46b | 390 | if (!tun->tfile) |
1da177e4 LT |
391 | goto drop; |
392 | ||
f271b2cc MK |
393 | /* Drop if the filter does not like it. |
394 | * This is a noop if the filter is disabled. | |
395 | * Filter can be enabled only for the TAP devices. */ | |
396 | if (!check_filter(&tun->txflt, skb)) | |
397 | goto drop; | |
398 | ||
99405162 MT |
399 | if (tun->socket.sk->sk_filter && |
400 | sk_filter(tun->socket.sk, skb)) | |
401 | goto drop; | |
402 | ||
89f56d1e | 403 | if (skb_queue_len(&tun->socket.sk->sk_receive_queue) >= dev->tx_queue_len) { |
1da177e4 LT |
404 | if (!(tun->flags & TUN_ONE_QUEUE)) { |
405 | /* Normal queueing mode. */ | |
406 | /* Packet scheduler handles dropping of further packets. */ | |
407 | netif_stop_queue(dev); | |
408 | ||
409 | /* We won't see all dropped packets individually, so overrun | |
410 | * error is more appropriate. */ | |
09f75cd7 | 411 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
412 | } else { |
413 | /* Single queue mode. | |
414 | * Driver handles dropping of all packets itself. */ | |
415 | goto drop; | |
416 | } | |
417 | } | |
418 | ||
0110d6f2 MT |
419 | /* Orphan the skb - required as we might hang on to it |
420 | * for indefinite time. */ | |
868eefeb MT |
421 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
422 | goto drop; | |
0110d6f2 MT |
423 | skb_orphan(skb); |
424 | ||
f271b2cc | 425 | /* Enqueue packet */ |
89f56d1e | 426 | skb_queue_tail(&tun->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
427 | |
428 | /* Notify and wake up reader process */ | |
429 | if (tun->flags & TUN_FASYNC) | |
430 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
43815482 | 431 | wake_up_interruptible_poll(&tun->wq.wait, POLLIN | |
05c2828c | 432 | POLLRDNORM | POLLRDBAND); |
6ed10654 | 433 | return NETDEV_TX_OK; |
1da177e4 LT |
434 | |
435 | drop: | |
09f75cd7 | 436 | dev->stats.tx_dropped++; |
1da177e4 | 437 | kfree_skb(skb); |
6ed10654 | 438 | return NETDEV_TX_OK; |
1da177e4 LT |
439 | } |
440 | ||
f271b2cc | 441 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 442 | { |
f271b2cc MK |
443 | /* |
444 | * This callback is supposed to deal with mc filter in | |
445 | * _rx_ path and has nothing to do with the _tx_ path. | |
446 | * In rx path we always accept everything userspace gives us. | |
447 | */ | |
1da177e4 LT |
448 | } |
449 | ||
4885a504 ES |
450 | #define MIN_MTU 68 |
451 | #define MAX_MTU 65535 | |
452 | ||
453 | static int | |
454 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
455 | { | |
456 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
457 | return -EINVAL; | |
458 | dev->mtu = new_mtu; | |
459 | return 0; | |
460 | } | |
461 | ||
c8f44aff MM |
462 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
463 | netdev_features_t features) | |
88255375 MM |
464 | { |
465 | struct tun_struct *tun = netdev_priv(dev); | |
466 | ||
467 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
468 | } | |
bebd097a NH |
469 | #ifdef CONFIG_NET_POLL_CONTROLLER |
470 | static void tun_poll_controller(struct net_device *dev) | |
471 | { | |
472 | /* | |
473 | * Tun only receives frames when: | |
474 | * 1) the char device endpoint gets data from user space | |
475 | * 2) the tun socket gets a sendmsg call from user space | |
476 | * Since both of those are syncronous operations, we are guaranteed | |
477 | * never to have pending data when we poll for it | |
478 | * so theres nothing to do here but return. | |
479 | * We need this though so netpoll recognizes us as an interface that | |
480 | * supports polling, which enables bridge devices in virt setups to | |
481 | * still use netconsole | |
482 | */ | |
483 | return; | |
484 | } | |
485 | #endif | |
758e43b7 | 486 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 487 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
488 | .ndo_open = tun_net_open, |
489 | .ndo_stop = tun_net_close, | |
00829823 | 490 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 491 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 492 | .ndo_fix_features = tun_net_fix_features, |
bebd097a NH |
493 | #ifdef CONFIG_NET_POLL_CONTROLLER |
494 | .ndo_poll_controller = tun_poll_controller, | |
495 | #endif | |
758e43b7 SH |
496 | }; |
497 | ||
498 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 499 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
500 | .ndo_open = tun_net_open, |
501 | .ndo_stop = tun_net_close, | |
00829823 | 502 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 503 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 504 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 505 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
506 | .ndo_set_mac_address = eth_mac_addr, |
507 | .ndo_validate_addr = eth_validate_addr, | |
bebd097a NH |
508 | #ifdef CONFIG_NET_POLL_CONTROLLER |
509 | .ndo_poll_controller = tun_poll_controller, | |
510 | #endif | |
758e43b7 SH |
511 | }; |
512 | ||
1da177e4 LT |
513 | /* Initialize net device. */ |
514 | static void tun_net_init(struct net_device *dev) | |
515 | { | |
516 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 517 | |
1da177e4 LT |
518 | switch (tun->flags & TUN_TYPE_MASK) { |
519 | case TUN_TUN_DEV: | |
758e43b7 SH |
520 | dev->netdev_ops = &tun_netdev_ops; |
521 | ||
1da177e4 LT |
522 | /* Point-to-Point TUN Device */ |
523 | dev->hard_header_len = 0; | |
524 | dev->addr_len = 0; | |
525 | dev->mtu = 1500; | |
526 | ||
527 | /* Zero header length */ | |
6aa20a22 | 528 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
529 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
530 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
531 | break; | |
532 | ||
533 | case TUN_TAP_DEV: | |
7a0a9608 | 534 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 535 | /* Ethernet TAP Device */ |
1da177e4 | 536 | ether_setup(dev); |
550fd08c | 537 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
36226a8d | 538 | |
f2cedb63 | 539 | eth_hw_addr_random(dev); |
36226a8d | 540 | |
1da177e4 LT |
541 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
542 | break; | |
543 | } | |
544 | } | |
545 | ||
546 | /* Character device part */ | |
547 | ||
548 | /* Poll */ | |
549 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 550 | { |
b2430de3 EB |
551 | struct tun_file *tfile = file->private_data; |
552 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 553 | struct sock *sk; |
33dccbb0 | 554 | unsigned int mask = 0; |
1da177e4 LT |
555 | |
556 | if (!tun) | |
eac9e902 | 557 | return POLLERR; |
1da177e4 | 558 | |
89f56d1e | 559 | sk = tun->socket.sk; |
3c8a9c63 | 560 | |
6b8a66ee | 561 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 562 | |
43815482 | 563 | poll_wait(file, &tun->wq.wait, wait); |
6aa20a22 | 564 | |
89f56d1e | 565 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
566 | mask |= POLLIN | POLLRDNORM; |
567 | ||
33dccbb0 HX |
568 | if (sock_writeable(sk) || |
569 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
570 | sock_writeable(sk))) | |
571 | mask |= POLLOUT | POLLWRNORM; | |
572 | ||
c70f1829 EB |
573 | if (tun->dev->reg_state != NETREG_REGISTERED) |
574 | mask = POLLERR; | |
575 | ||
631ab46b | 576 | tun_put(tun); |
1da177e4 LT |
577 | return mask; |
578 | } | |
579 | ||
f42157cb RR |
580 | /* prepad is the amount to reserve at front. len is length after that. |
581 | * linear is a hint as to how much to copy (usually headers). */ | |
6f7c156c | 582 | static struct sk_buff *tun_alloc_skb(struct tun_struct *tun, |
583 | size_t prepad, size_t len, | |
584 | size_t linear, int noblock) | |
f42157cb | 585 | { |
89f56d1e | 586 | struct sock *sk = tun->socket.sk; |
f42157cb | 587 | struct sk_buff *skb; |
33dccbb0 | 588 | int err; |
f42157cb | 589 | |
82862742 HX |
590 | sock_update_classid(sk); |
591 | ||
f42157cb | 592 | /* Under a page? Don't bother with paged skb. */ |
0eca93bc | 593 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 594 | linear = len; |
f42157cb | 595 | |
33dccbb0 HX |
596 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
597 | &err); | |
f42157cb | 598 | if (!skb) |
33dccbb0 | 599 | return ERR_PTR(err); |
f42157cb RR |
600 | |
601 | skb_reserve(skb, prepad); | |
602 | skb_put(skb, linear); | |
33dccbb0 HX |
603 | skb->data_len = len - linear; |
604 | skb->len += len - linear; | |
f42157cb RR |
605 | |
606 | return skb; | |
607 | } | |
608 | ||
0690899b MT |
609 | /* set skb frags from iovec, this can move to core network code for reuse */ |
610 | static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from, | |
611 | int offset, size_t count) | |
612 | { | |
613 | int len = iov_length(from, count) - offset; | |
614 | int copy = skb_headlen(skb); | |
615 | int size, offset1 = 0; | |
616 | int i = 0; | |
617 | ||
618 | /* Skip over from offset */ | |
619 | while (count && (offset >= from->iov_len)) { | |
620 | offset -= from->iov_len; | |
621 | ++from; | |
622 | --count; | |
623 | } | |
624 | ||
625 | /* copy up to skb headlen */ | |
626 | while (count && (copy > 0)) { | |
627 | size = min_t(unsigned int, copy, from->iov_len - offset); | |
628 | if (copy_from_user(skb->data + offset1, from->iov_base + offset, | |
629 | size)) | |
630 | return -EFAULT; | |
631 | if (copy > size) { | |
632 | ++from; | |
633 | --count; | |
634 | offset = 0; | |
635 | } else | |
636 | offset += size; | |
637 | copy -= size; | |
638 | offset1 += size; | |
639 | } | |
640 | ||
641 | if (len == offset1) | |
642 | return 0; | |
643 | ||
644 | while (count--) { | |
645 | struct page *page[MAX_SKB_FRAGS]; | |
646 | int num_pages; | |
647 | unsigned long base; | |
648 | unsigned long truesize; | |
649 | ||
650 | len = from->iov_len - offset; | |
651 | if (!len) { | |
652 | offset = 0; | |
653 | ++from; | |
654 | continue; | |
655 | } | |
656 | base = (unsigned long)from->iov_base + offset; | |
657 | size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT; | |
658 | if (i + size > MAX_SKB_FRAGS) | |
659 | return -EMSGSIZE; | |
660 | num_pages = get_user_pages_fast(base, size, 0, &page[i]); | |
661 | if (num_pages != size) { | |
662 | for (i = 0; i < num_pages; i++) | |
663 | put_page(page[i]); | |
664 | return -EFAULT; | |
665 | } | |
666 | truesize = size * PAGE_SIZE; | |
667 | skb->data_len += len; | |
668 | skb->len += len; | |
669 | skb->truesize += truesize; | |
670 | atomic_add(truesize, &skb->sk->sk_wmem_alloc); | |
671 | while (len) { | |
672 | int off = base & ~PAGE_MASK; | |
673 | int size = min_t(int, len, PAGE_SIZE - off); | |
674 | __skb_fill_page_desc(skb, i, page[i], off, size); | |
675 | skb_shinfo(skb)->nr_frags++; | |
676 | /* increase sk_wmem_alloc */ | |
677 | base += size; | |
678 | len -= size; | |
679 | i++; | |
680 | } | |
681 | offset = 0; | |
682 | ++from; | |
683 | } | |
684 | return 0; | |
685 | } | |
686 | ||
1da177e4 | 687 | /* Get packet from user space buffer */ |
0690899b MT |
688 | static ssize_t tun_get_user(struct tun_struct *tun, void *msg_control, |
689 | const struct iovec *iv, size_t total_len, | |
690 | size_t count, int noblock) | |
1da177e4 | 691 | { |
09640e63 | 692 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 693 | struct sk_buff *skb; |
0690899b | 694 | size_t len = total_len, align = NET_SKB_PAD; |
f43798c2 | 695 | struct virtio_net_hdr gso = { 0 }; |
6f26c9a7 | 696 | int offset = 0; |
0690899b MT |
697 | int copylen; |
698 | bool zerocopy = false; | |
699 | int err; | |
1da177e4 LT |
700 | |
701 | if (!(tun->flags & TUN_NO_PI)) { | |
0690899b | 702 | if ((len -= sizeof(pi)) > total_len) |
1da177e4 LT |
703 | return -EINVAL; |
704 | ||
6f26c9a7 | 705 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 706 | return -EFAULT; |
6f26c9a7 | 707 | offset += sizeof(pi); |
1da177e4 LT |
708 | } |
709 | ||
f43798c2 | 710 | if (tun->flags & TUN_VNET_HDR) { |
0690899b | 711 | if ((len -= tun->vnet_hdr_sz) > total_len) |
f43798c2 RR |
712 | return -EINVAL; |
713 | ||
6f26c9a7 | 714 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
715 | return -EFAULT; |
716 | ||
4909122f HX |
717 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
718 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
719 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
720 | ||
f43798c2 RR |
721 | if (gso.hdr_len > len) |
722 | return -EINVAL; | |
d9d52b51 | 723 | offset += tun->vnet_hdr_sz; |
f43798c2 RR |
724 | } |
725 | ||
e01bf1c8 | 726 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
a504b86e | 727 | align += NET_IP_ALIGN; |
0eca93bc HX |
728 | if (unlikely(len < ETH_HLEN || |
729 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
730 | return -EINVAL; |
731 | } | |
6aa20a22 | 732 | |
0690899b MT |
733 | if (msg_control) |
734 | zerocopy = true; | |
735 | ||
736 | if (zerocopy) { | |
737 | /* Userspace may produce vectors with count greater than | |
738 | * MAX_SKB_FRAGS, so we need to linearize parts of the skb | |
739 | * to let the rest of data to be fit in the frags. | |
740 | */ | |
741 | if (count > MAX_SKB_FRAGS) { | |
742 | copylen = iov_length(iv, count - MAX_SKB_FRAGS); | |
743 | if (copylen < offset) | |
744 | copylen = 0; | |
745 | else | |
746 | copylen -= offset; | |
747 | } else | |
748 | copylen = 0; | |
749 | /* There are 256 bytes to be copied in skb, so there is enough | |
750 | * room for skb expand head in case it is used. | |
751 | * The rest of the buffer is mapped from userspace. | |
752 | */ | |
753 | if (copylen < gso.hdr_len) | |
754 | copylen = gso.hdr_len; | |
755 | if (!copylen) | |
756 | copylen = GOODCOPY_LEN; | |
757 | } else | |
758 | copylen = len; | |
759 | ||
760 | skb = tun_alloc_skb(tun, align, copylen, gso.hdr_len, noblock); | |
33dccbb0 HX |
761 | if (IS_ERR(skb)) { |
762 | if (PTR_ERR(skb) != -EAGAIN) | |
763 | tun->dev->stats.rx_dropped++; | |
764 | return PTR_ERR(skb); | |
1da177e4 LT |
765 | } |
766 | ||
0690899b MT |
767 | if (zerocopy) |
768 | err = zerocopy_sg_from_iovec(skb, iv, offset, count); | |
769 | else | |
770 | err = skb_copy_datagram_from_iovec(skb, 0, iv, offset, len); | |
771 | ||
772 | if (err) { | |
09f75cd7 | 773 | tun->dev->stats.rx_dropped++; |
8f22757e | 774 | kfree_skb(skb); |
1da177e4 | 775 | return -EFAULT; |
8f22757e | 776 | } |
1da177e4 | 777 | |
f43798c2 RR |
778 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
779 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
780 | gso.csum_offset)) { | |
781 | tun->dev->stats.rx_frame_errors++; | |
782 | kfree_skb(skb); | |
783 | return -EINVAL; | |
784 | } | |
88255375 | 785 | } |
f43798c2 | 786 | |
1da177e4 LT |
787 | switch (tun->flags & TUN_TYPE_MASK) { |
788 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
789 | if (tun->flags & TUN_NO_PI) { |
790 | switch (skb->data[0] & 0xf0) { | |
791 | case 0x40: | |
792 | pi.proto = htons(ETH_P_IP); | |
793 | break; | |
794 | case 0x60: | |
795 | pi.proto = htons(ETH_P_IPV6); | |
796 | break; | |
797 | default: | |
798 | tun->dev->stats.rx_dropped++; | |
799 | kfree_skb(skb); | |
800 | return -EINVAL; | |
801 | } | |
802 | } | |
803 | ||
459a98ed | 804 | skb_reset_mac_header(skb); |
1da177e4 | 805 | skb->protocol = pi.proto; |
4c13eb66 | 806 | skb->dev = tun->dev; |
1da177e4 LT |
807 | break; |
808 | case TUN_TAP_DEV: | |
809 | skb->protocol = eth_type_trans(skb, tun->dev); | |
810 | break; | |
6403eab1 | 811 | } |
1da177e4 | 812 | |
f43798c2 RR |
813 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
814 | pr_debug("GSO!\n"); | |
815 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
816 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
817 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
818 | break; | |
819 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
820 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
821 | break; | |
e36aa25a SS |
822 | case VIRTIO_NET_HDR_GSO_UDP: |
823 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
824 | break; | |
f43798c2 RR |
825 | default: |
826 | tun->dev->stats.rx_frame_errors++; | |
827 | kfree_skb(skb); | |
828 | return -EINVAL; | |
829 | } | |
830 | ||
831 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
832 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
833 | ||
834 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
835 | if (skb_shinfo(skb)->gso_size == 0) { | |
836 | tun->dev->stats.rx_frame_errors++; | |
837 | kfree_skb(skb); | |
838 | return -EINVAL; | |
839 | } | |
840 | ||
841 | /* Header must be checked, and gso_segs computed. */ | |
842 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
843 | skb_shinfo(skb)->gso_segs = 0; | |
844 | } | |
6aa20a22 | 845 | |
0690899b MT |
846 | /* copy skb_ubuf_info for callback when skb has no error */ |
847 | if (zerocopy) { | |
848 | skb_shinfo(skb)->destructor_arg = msg_control; | |
849 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
850 | } | |
851 | ||
1da177e4 | 852 | netif_rx_ni(skb); |
6aa20a22 | 853 | |
09f75cd7 JG |
854 | tun->dev->stats.rx_packets++; |
855 | tun->dev->stats.rx_bytes += len; | |
1da177e4 | 856 | |
0690899b | 857 | return total_len; |
6aa20a22 | 858 | } |
1da177e4 | 859 | |
ee0b3e67 BP |
860 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
861 | unsigned long count, loff_t pos) | |
1da177e4 | 862 | { |
33dccbb0 | 863 | struct file *file = iocb->ki_filp; |
ab46d779 | 864 | struct tun_struct *tun = tun_get(file); |
631ab46b | 865 | ssize_t result; |
1da177e4 LT |
866 | |
867 | if (!tun) | |
868 | return -EBADFD; | |
869 | ||
6b8a66ee | 870 | tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count); |
1da177e4 | 871 | |
0690899b | 872 | result = tun_get_user(tun, NULL, iv, iov_length(iv, count), count, |
33dccbb0 | 873 | file->f_flags & O_NONBLOCK); |
631ab46b EB |
874 | |
875 | tun_put(tun); | |
876 | return result; | |
1da177e4 LT |
877 | } |
878 | ||
1da177e4 | 879 | /* Put packet to the user space buffer */ |
6f7c156c | 880 | static ssize_t tun_put_user(struct tun_struct *tun, |
881 | struct sk_buff *skb, | |
882 | const struct iovec *iv, int len) | |
1da177e4 LT |
883 | { |
884 | struct tun_pi pi = { 0, skb->protocol }; | |
885 | ssize_t total = 0; | |
886 | ||
887 | if (!(tun->flags & TUN_NO_PI)) { | |
888 | if ((len -= sizeof(pi)) < 0) | |
889 | return -EINVAL; | |
890 | ||
891 | if (len < skb->len) { | |
892 | /* Packet will be striped */ | |
893 | pi.flags |= TUN_PKT_STRIP; | |
894 | } | |
6aa20a22 | 895 | |
43b39dcd | 896 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
897 | return -EFAULT; |
898 | total += sizeof(pi); | |
6aa20a22 | 899 | } |
1da177e4 | 900 | |
f43798c2 RR |
901 | if (tun->flags & TUN_VNET_HDR) { |
902 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
d9d52b51 | 903 | if ((len -= tun->vnet_hdr_sz) < 0) |
f43798c2 RR |
904 | return -EINVAL; |
905 | ||
906 | if (skb_is_gso(skb)) { | |
907 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
908 | ||
909 | /* This is a hint as to how much should be linear. */ | |
910 | gso.hdr_len = skb_headlen(skb); | |
911 | gso.gso_size = sinfo->gso_size; | |
912 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
913 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
914 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
915 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e36aa25a SS |
916 | else if (sinfo->gso_type & SKB_GSO_UDP) |
917 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
ef3db4a5 | 918 | else { |
6b8a66ee | 919 | pr_err("unexpected GSO type: " |
ef3db4a5 MT |
920 | "0x%x, gso_size %d, hdr_len %d\n", |
921 | sinfo->gso_type, gso.gso_size, | |
922 | gso.hdr_len); | |
923 | print_hex_dump(KERN_ERR, "tun: ", | |
924 | DUMP_PREFIX_NONE, | |
925 | 16, 1, skb->head, | |
926 | min((int)gso.hdr_len, 64), true); | |
927 | WARN_ON_ONCE(1); | |
928 | return -EINVAL; | |
929 | } | |
f43798c2 RR |
930 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
931 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
932 | } else | |
933 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
934 | ||
935 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
936 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 937 | gso.csum_start = skb_checksum_start_offset(skb); |
f43798c2 | 938 | gso.csum_offset = skb->csum_offset; |
10a8d94a JW |
939 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
940 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
f43798c2 RR |
941 | } /* else everything is zero */ |
942 | ||
43b39dcd MT |
943 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
944 | sizeof(gso)))) | |
f43798c2 | 945 | return -EFAULT; |
d9d52b51 | 946 | total += tun->vnet_hdr_sz; |
f43798c2 RR |
947 | } |
948 | ||
1da177e4 LT |
949 | len = min_t(int, skb->len, len); |
950 | ||
43b39dcd | 951 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
05c2828c | 952 | total += skb->len; |
1da177e4 | 953 | |
09f75cd7 JG |
954 | tun->dev->stats.tx_packets++; |
955 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
956 | |
957 | return total; | |
958 | } | |
959 | ||
05c2828c MT |
960 | static ssize_t tun_do_read(struct tun_struct *tun, |
961 | struct kiocb *iocb, const struct iovec *iv, | |
962 | ssize_t len, int noblock) | |
1da177e4 | 963 | { |
1da177e4 LT |
964 | DECLARE_WAITQUEUE(wait, current); |
965 | struct sk_buff *skb; | |
05c2828c | 966 | ssize_t ret = 0; |
1da177e4 | 967 | |
6b8a66ee | 968 | tun_debug(KERN_INFO, tun, "tun_chr_read\n"); |
1da177e4 | 969 | |
61a5ff15 AK |
970 | if (unlikely(!noblock)) |
971 | add_wait_queue(&tun->wq.wait, &wait); | |
1da177e4 | 972 | while (len) { |
1da177e4 LT |
973 | current->state = TASK_INTERRUPTIBLE; |
974 | ||
975 | /* Read frames from the queue */ | |
89f56d1e | 976 | if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) { |
05c2828c | 977 | if (noblock) { |
1da177e4 LT |
978 | ret = -EAGAIN; |
979 | break; | |
980 | } | |
981 | if (signal_pending(current)) { | |
982 | ret = -ERESTARTSYS; | |
983 | break; | |
984 | } | |
c70f1829 EB |
985 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
986 | ret = -EIO; | |
987 | break; | |
988 | } | |
1da177e4 LT |
989 | |
990 | /* Nothing to read, let's sleep */ | |
991 | schedule(); | |
992 | continue; | |
993 | } | |
994 | netif_wake_queue(tun->dev); | |
995 | ||
43b39dcd | 996 | ret = tun_put_user(tun, skb, iv, len); |
f271b2cc MK |
997 | kfree_skb(skb); |
998 | break; | |
1da177e4 LT |
999 | } |
1000 | ||
1001 | current->state = TASK_RUNNING; | |
61a5ff15 AK |
1002 | if (unlikely(!noblock)) |
1003 | remove_wait_queue(&tun->wq.wait, &wait); | |
1da177e4 | 1004 | |
05c2828c MT |
1005 | return ret; |
1006 | } | |
1007 | ||
1008 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
1009 | unsigned long count, loff_t pos) | |
1010 | { | |
1011 | struct file *file = iocb->ki_filp; | |
1012 | struct tun_file *tfile = file->private_data; | |
1013 | struct tun_struct *tun = __tun_get(tfile); | |
1014 | ssize_t len, ret; | |
1015 | ||
1016 | if (!tun) | |
1017 | return -EBADFD; | |
1018 | len = iov_length(iv, count); | |
1019 | if (len < 0) { | |
1020 | ret = -EINVAL; | |
1021 | goto out; | |
1022 | } | |
1023 | ||
1024 | ret = tun_do_read(tun, iocb, iv, len, file->f_flags & O_NONBLOCK); | |
1025 | ret = min_t(ssize_t, ret, len); | |
631ab46b EB |
1026 | out: |
1027 | tun_put(tun); | |
1da177e4 LT |
1028 | return ret; |
1029 | } | |
1030 | ||
1da177e4 LT |
1031 | static void tun_setup(struct net_device *dev) |
1032 | { | |
1033 | struct tun_struct *tun = netdev_priv(dev); | |
1034 | ||
1da177e4 | 1035 | tun->owner = -1; |
8c644623 | 1036 | tun->group = -1; |
1da177e4 | 1037 | |
1da177e4 | 1038 | dev->ethtool_ops = &tun_ethtool_ops; |
9c3fea6a | 1039 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
1040 | } |
1041 | ||
f019a7a5 EB |
1042 | /* Trivial set of netlink ops to allow deleting tun or tap |
1043 | * device with netlink. | |
1044 | */ | |
1045 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1046 | { | |
1047 | return -EINVAL; | |
1048 | } | |
1049 | ||
1050 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1051 | .kind = DRV_NAME, | |
1052 | .priv_size = sizeof(struct tun_struct), | |
1053 | .setup = tun_setup, | |
1054 | .validate = tun_validate, | |
1055 | }; | |
1056 | ||
33dccbb0 HX |
1057 | static void tun_sock_write_space(struct sock *sk) |
1058 | { | |
1059 | struct tun_struct *tun; | |
43815482 | 1060 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1061 | |
1062 | if (!sock_writeable(sk)) | |
1063 | return; | |
1064 | ||
33dccbb0 HX |
1065 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
1066 | return; | |
1067 | ||
43815482 ED |
1068 | wqueue = sk_sleep(sk); |
1069 | if (wqueue && waitqueue_active(wqueue)) | |
1070 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1071 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1072 | |
80924e5f | 1073 | tun = tun_sk(sk)->tun; |
33dccbb0 HX |
1074 | kill_fasync(&tun->fasync, SIGIO, POLL_OUT); |
1075 | } | |
1076 | ||
1077 | static void tun_sock_destruct(struct sock *sk) | |
1078 | { | |
80924e5f | 1079 | free_netdev(tun_sk(sk)->tun->dev); |
33dccbb0 HX |
1080 | } |
1081 | ||
05c2828c MT |
1082 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
1083 | struct msghdr *m, size_t total_len) | |
1084 | { | |
1085 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
0690899b MT |
1086 | return tun_get_user(tun, m->msg_control, m->msg_iov, total_len, |
1087 | m->msg_iovlen, m->msg_flags & MSG_DONTWAIT); | |
05c2828c MT |
1088 | } |
1089 | ||
1090 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1091 | struct msghdr *m, size_t total_len, | |
1092 | int flags) | |
1093 | { | |
1094 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
1095 | int ret; | |
1096 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) | |
1097 | return -EINVAL; | |
1098 | ret = tun_do_read(tun, iocb, m->msg_iov, total_len, | |
1099 | flags & MSG_DONTWAIT); | |
1100 | if (ret > total_len) { | |
1101 | m->msg_flags |= MSG_TRUNC; | |
1102 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1103 | } | |
1104 | return ret; | |
1105 | } | |
1106 | ||
1ab5ecb9 SK |
1107 | static int tun_release(struct socket *sock) |
1108 | { | |
1109 | if (sock->sk) | |
1110 | sock_put(sock->sk); | |
1111 | return 0; | |
1112 | } | |
1113 | ||
05c2828c MT |
1114 | /* Ops structure to mimic raw sockets with tun */ |
1115 | static const struct proto_ops tun_socket_ops = { | |
1116 | .sendmsg = tun_sendmsg, | |
1117 | .recvmsg = tun_recvmsg, | |
1ab5ecb9 | 1118 | .release = tun_release, |
05c2828c MT |
1119 | }; |
1120 | ||
33dccbb0 HX |
1121 | static struct proto tun_proto = { |
1122 | .name = "tun", | |
1123 | .owner = THIS_MODULE, | |
1124 | .obj_size = sizeof(struct tun_sock), | |
1125 | }; | |
f019a7a5 | 1126 | |
980c9e8c DW |
1127 | static int tun_flags(struct tun_struct *tun) |
1128 | { | |
1129 | int flags = 0; | |
1130 | ||
1131 | if (tun->flags & TUN_TUN_DEV) | |
1132 | flags |= IFF_TUN; | |
1133 | else | |
1134 | flags |= IFF_TAP; | |
1135 | ||
1136 | if (tun->flags & TUN_NO_PI) | |
1137 | flags |= IFF_NO_PI; | |
1138 | ||
1139 | if (tun->flags & TUN_ONE_QUEUE) | |
1140 | flags |= IFF_ONE_QUEUE; | |
1141 | ||
1142 | if (tun->flags & TUN_VNET_HDR) | |
1143 | flags |= IFF_VNET_HDR; | |
1144 | ||
1145 | return flags; | |
1146 | } | |
1147 | ||
1148 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1149 | char *buf) | |
1150 | { | |
1151 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1152 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1153 | } | |
1154 | ||
1155 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1156 | char *buf) | |
1157 | { | |
1158 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1159 | return sprintf(buf, "%d\n", tun->owner); | |
1160 | } | |
1161 | ||
1162 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1163 | char *buf) | |
1164 | { | |
1165 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1166 | return sprintf(buf, "%d\n", tun->group); | |
1167 | } | |
1168 | ||
1169 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1170 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1171 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1172 | ||
d647a591 | 1173 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 | 1174 | { |
33dccbb0 | 1175 | struct sock *sk; |
1da177e4 LT |
1176 | struct tun_struct *tun; |
1177 | struct net_device *dev; | |
1178 | int err; | |
1179 | ||
74a3e5a7 EB |
1180 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1181 | if (dev) { | |
2b980dbd PM |
1182 | const struct cred *cred = current_cred(); |
1183 | ||
f85ba780 DW |
1184 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1185 | return -EBUSY; | |
74a3e5a7 EB |
1186 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1187 | tun = netdev_priv(dev); | |
1188 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1189 | tun = netdev_priv(dev); | |
1190 | else | |
1191 | return -EINVAL; | |
1192 | ||
2b980dbd PM |
1193 | if (((tun->owner != -1 && cred->euid != tun->owner) || |
1194 | (tun->group != -1 && !in_egroup_p(tun->group))) && | |
1195 | !capable(CAP_NET_ADMIN)) | |
1196 | return -EPERM; | |
d7e9660a | 1197 | err = security_tun_dev_attach(tun->socket.sk); |
2b980dbd PM |
1198 | if (err < 0) |
1199 | return err; | |
1200 | ||
a7385ba2 EB |
1201 | err = tun_attach(tun, file); |
1202 | if (err < 0) | |
1203 | return err; | |
6aa20a22 | 1204 | } |
1da177e4 LT |
1205 | else { |
1206 | char *name; | |
1207 | unsigned long flags = 0; | |
1208 | ||
ca6bb5d7 DW |
1209 | if (!capable(CAP_NET_ADMIN)) |
1210 | return -EPERM; | |
2b980dbd PM |
1211 | err = security_tun_dev_create(); |
1212 | if (err < 0) | |
1213 | return err; | |
ca6bb5d7 | 1214 | |
1da177e4 LT |
1215 | /* Set dev type */ |
1216 | if (ifr->ifr_flags & IFF_TUN) { | |
1217 | /* TUN device */ | |
1218 | flags |= TUN_TUN_DEV; | |
1219 | name = "tun%d"; | |
1220 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1221 | /* TAP device */ | |
1222 | flags |= TUN_TAP_DEV; | |
1223 | name = "tap%d"; | |
6aa20a22 | 1224 | } else |
36989b90 | 1225 | return -EINVAL; |
6aa20a22 | 1226 | |
1da177e4 LT |
1227 | if (*ifr->ifr_name) |
1228 | name = ifr->ifr_name; | |
1229 | ||
1230 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
1231 | tun_setup); | |
1232 | if (!dev) | |
1233 | return -ENOMEM; | |
1234 | ||
fc54c658 | 1235 | dev_net_set(dev, net); |
f019a7a5 | 1236 | dev->rtnl_link_ops = &tun_link_ops; |
758e43b7 | 1237 | |
1da177e4 LT |
1238 | tun = netdev_priv(dev); |
1239 | tun->dev = dev; | |
1240 | tun->flags = flags; | |
f271b2cc | 1241 | tun->txflt.count = 0; |
d9d52b51 | 1242 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
b09e786b | 1243 | set_bit(SOCK_EXTERNALLY_ALLOCATED, &tun->socket.flags); |
1da177e4 | 1244 | |
33dccbb0 | 1245 | err = -ENOMEM; |
1ab5ecb9 | 1246 | sk = sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL, &tun_proto); |
33dccbb0 HX |
1247 | if (!sk) |
1248 | goto err_free_dev; | |
1249 | ||
1ab5ecb9 | 1250 | sk_change_net(sk, net); |
43815482 ED |
1251 | tun->socket.wq = &tun->wq; |
1252 | init_waitqueue_head(&tun->wq.wait); | |
05c2828c | 1253 | tun->socket.ops = &tun_socket_ops; |
33dccbb0 HX |
1254 | sock_init_data(&tun->socket, sk); |
1255 | sk->sk_write_space = tun_sock_write_space; | |
33dccbb0 | 1256 | sk->sk_sndbuf = INT_MAX; |
0690899b | 1257 | sock_set_flag(sk, SOCK_ZEROCOPY); |
33dccbb0 | 1258 | |
80924e5f | 1259 | tun_sk(sk)->tun = tun; |
33dccbb0 | 1260 | |
2b980dbd PM |
1261 | security_tun_dev_post_create(sk); |
1262 | ||
1da177e4 LT |
1263 | tun_net_init(dev); |
1264 | ||
88255375 MM |
1265 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
1266 | TUN_USER_FEATURES; | |
1267 | dev->features = dev->hw_features; | |
1268 | ||
1da177e4 LT |
1269 | err = register_netdevice(tun->dev); |
1270 | if (err < 0) | |
9c3fea6a HX |
1271 | goto err_free_sk; |
1272 | ||
980c9e8c DW |
1273 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1274 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1275 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
6b8a66ee | 1276 | pr_err("Failed to create tun sysfs files\n"); |
980c9e8c | 1277 | |
9c3fea6a | 1278 | sk->sk_destruct = tun_sock_destruct; |
a7385ba2 EB |
1279 | |
1280 | err = tun_attach(tun, file); | |
1281 | if (err < 0) | |
9c3fea6a | 1282 | goto failed; |
1da177e4 LT |
1283 | } |
1284 | ||
6b8a66ee | 1285 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 LT |
1286 | |
1287 | if (ifr->ifr_flags & IFF_NO_PI) | |
1288 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1289 | else |
1290 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
1291 | |
1292 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
1293 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1294 | else |
1295 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1296 | |
f43798c2 RR |
1297 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1298 | tun->flags |= TUN_VNET_HDR; | |
1299 | else | |
1300 | tun->flags &= ~TUN_VNET_HDR; | |
1301 | ||
e35259a9 MK |
1302 | /* Make sure persistent devices do not get stuck in |
1303 | * xoff state. | |
1304 | */ | |
1305 | if (netif_running(tun->dev)) | |
1306 | netif_wake_queue(tun->dev); | |
1307 | ||
1da177e4 LT |
1308 | strcpy(ifr->ifr_name, tun->dev->name); |
1309 | return 0; | |
1310 | ||
33dccbb0 | 1311 | err_free_sk: |
1ab5ecb9 | 1312 | tun_free_netdev(dev); |
1da177e4 LT |
1313 | err_free_dev: |
1314 | free_netdev(dev); | |
1315 | failed: | |
1316 | return err; | |
1317 | } | |
1318 | ||
876bfd4d HX |
1319 | static int tun_get_iff(struct net *net, struct tun_struct *tun, |
1320 | struct ifreq *ifr) | |
e3b99556 | 1321 | { |
6b8a66ee | 1322 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1323 | |
1324 | strcpy(ifr->ifr_name, tun->dev->name); | |
1325 | ||
980c9e8c | 1326 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 MM |
1327 | |
1328 | return 0; | |
1329 | } | |
1330 | ||
5228ddc9 RR |
1331 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1332 | * privs required. */ | |
88255375 | 1333 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1334 | { |
c8f44aff | 1335 | netdev_features_t features = 0; |
5228ddc9 RR |
1336 | |
1337 | if (arg & TUN_F_CSUM) { | |
88255375 | 1338 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1339 | arg &= ~TUN_F_CSUM; |
1340 | ||
1341 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1342 | if (arg & TUN_F_TSO_ECN) { | |
1343 | features |= NETIF_F_TSO_ECN; | |
1344 | arg &= ~TUN_F_TSO_ECN; | |
1345 | } | |
1346 | if (arg & TUN_F_TSO4) | |
1347 | features |= NETIF_F_TSO; | |
1348 | if (arg & TUN_F_TSO6) | |
1349 | features |= NETIF_F_TSO6; | |
1350 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1351 | } | |
e36aa25a SS |
1352 | |
1353 | if (arg & TUN_F_UFO) { | |
1354 | features |= NETIF_F_UFO; | |
1355 | arg &= ~TUN_F_UFO; | |
1356 | } | |
5228ddc9 RR |
1357 | } |
1358 | ||
1359 | /* This gives the user a way to test for new features in future by | |
1360 | * trying to set them. */ | |
1361 | if (arg) | |
1362 | return -EINVAL; | |
1363 | ||
88255375 MM |
1364 | tun->set_features = features; |
1365 | netdev_update_features(tun->dev); | |
5228ddc9 RR |
1366 | |
1367 | return 0; | |
1368 | } | |
1369 | ||
50857e2a AB |
1370 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1371 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1372 | { |
36b50bab | 1373 | struct tun_file *tfile = file->private_data; |
631ab46b | 1374 | struct tun_struct *tun; |
1da177e4 | 1375 | void __user* argp = (void __user*)arg; |
99405162 | 1376 | struct sock_fprog fprog; |
1da177e4 | 1377 | struct ifreq ifr; |
33dccbb0 | 1378 | int sndbuf; |
d9d52b51 | 1379 | int vnet_hdr_sz; |
f271b2cc | 1380 | int ret; |
1da177e4 LT |
1381 | |
1382 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
50857e2a | 1383 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 LT |
1384 | return -EFAULT; |
1385 | ||
631ab46b EB |
1386 | if (cmd == TUNGETFEATURES) { |
1387 | /* Currently this just means: "what IFF flags are valid?". | |
1388 | * This is needed because we never checked for invalid flags on | |
1389 | * TUNSETIFF. */ | |
1390 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
1391 | IFF_VNET_HDR, | |
1392 | (unsigned int __user*)argp); | |
1393 | } | |
1394 | ||
876bfd4d HX |
1395 | rtnl_lock(); |
1396 | ||
36b50bab | 1397 | tun = __tun_get(tfile); |
1da177e4 | 1398 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1399 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1400 | ||
876bfd4d | 1401 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1402 | |
876bfd4d HX |
1403 | if (ret) |
1404 | goto unlock; | |
1da177e4 | 1405 | |
50857e2a | 1406 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1407 | ret = -EFAULT; |
1408 | goto unlock; | |
1da177e4 LT |
1409 | } |
1410 | ||
876bfd4d | 1411 | ret = -EBADFD; |
1da177e4 | 1412 | if (!tun) |
876bfd4d | 1413 | goto unlock; |
1da177e4 | 1414 | |
6b8a66ee | 1415 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %d\n", cmd); |
1da177e4 | 1416 | |
631ab46b | 1417 | ret = 0; |
1da177e4 | 1418 | switch (cmd) { |
e3b99556 | 1419 | case TUNGETIFF: |
876bfd4d | 1420 | ret = tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1421 | if (ret) |
631ab46b | 1422 | break; |
e3b99556 | 1423 | |
50857e2a | 1424 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1425 | ret = -EFAULT; |
e3b99556 MM |
1426 | break; |
1427 | ||
1da177e4 LT |
1428 | case TUNSETNOCSUM: |
1429 | /* Disable/Enable checksum */ | |
1da177e4 | 1430 | |
88255375 MM |
1431 | /* [unimplemented] */ |
1432 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 1433 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
1434 | break; |
1435 | ||
1436 | case TUNSETPERSIST: | |
1437 | /* Disable/Enable persist mode */ | |
1438 | if (arg) | |
1439 | tun->flags |= TUN_PERSIST; | |
1440 | else | |
1441 | tun->flags &= ~TUN_PERSIST; | |
1442 | ||
6b8a66ee JP |
1443 | tun_debug(KERN_INFO, tun, "persist %s\n", |
1444 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
1445 | break; |
1446 | ||
1447 | case TUNSETOWNER: | |
1448 | /* Set owner of the device */ | |
1449 | tun->owner = (uid_t) arg; | |
1450 | ||
6b8a66ee | 1451 | tun_debug(KERN_INFO, tun, "owner set to %d\n", tun->owner); |
1da177e4 LT |
1452 | break; |
1453 | ||
8c644623 GG |
1454 | case TUNSETGROUP: |
1455 | /* Set group of the device */ | |
1456 | tun->group= (gid_t) arg; | |
1457 | ||
6b8a66ee | 1458 | tun_debug(KERN_INFO, tun, "group set to %d\n", tun->group); |
8c644623 GG |
1459 | break; |
1460 | ||
ff4cc3ac MK |
1461 | case TUNSETLINK: |
1462 | /* Only allow setting the type when the interface is down */ | |
1463 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
1464 | tun_debug(KERN_INFO, tun, |
1465 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 1466 | ret = -EBUSY; |
ff4cc3ac MK |
1467 | } else { |
1468 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
1469 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
1470 | tun->dev->type); | |
48abfe05 | 1471 | ret = 0; |
ff4cc3ac | 1472 | } |
631ab46b | 1473 | break; |
ff4cc3ac | 1474 | |
1da177e4 LT |
1475 | #ifdef TUN_DEBUG |
1476 | case TUNSETDEBUG: | |
1477 | tun->debug = arg; | |
1478 | break; | |
1479 | #endif | |
5228ddc9 | 1480 | case TUNSETOFFLOAD: |
88255375 | 1481 | ret = set_offload(tun, arg); |
631ab46b | 1482 | break; |
5228ddc9 | 1483 | |
f271b2cc MK |
1484 | case TUNSETTXFILTER: |
1485 | /* Can be set only for TAPs */ | |
631ab46b | 1486 | ret = -EINVAL; |
f271b2cc | 1487 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 1488 | break; |
c0e5a8c2 | 1489 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 1490 | break; |
1da177e4 LT |
1491 | |
1492 | case SIOCGIFHWADDR: | |
b595076a | 1493 | /* Get hw address */ |
f271b2cc MK |
1494 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
1495 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 1496 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
1497 | ret = -EFAULT; |
1498 | break; | |
1da177e4 LT |
1499 | |
1500 | case SIOCSIFHWADDR: | |
f271b2cc | 1501 | /* Set hw address */ |
6b8a66ee JP |
1502 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
1503 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 1504 | |
40102371 | 1505 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 1506 | break; |
33dccbb0 HX |
1507 | |
1508 | case TUNGETSNDBUF: | |
89f56d1e | 1509 | sndbuf = tun->socket.sk->sk_sndbuf; |
33dccbb0 HX |
1510 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
1511 | ret = -EFAULT; | |
1512 | break; | |
1513 | ||
1514 | case TUNSETSNDBUF: | |
1515 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
1516 | ret = -EFAULT; | |
1517 | break; | |
1518 | } | |
1519 | ||
89f56d1e | 1520 | tun->socket.sk->sk_sndbuf = sndbuf; |
33dccbb0 HX |
1521 | break; |
1522 | ||
d9d52b51 MT |
1523 | case TUNGETVNETHDRSZ: |
1524 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
1525 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
1526 | ret = -EFAULT; | |
1527 | break; | |
1528 | ||
1529 | case TUNSETVNETHDRSZ: | |
1530 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
1531 | ret = -EFAULT; | |
1532 | break; | |
1533 | } | |
1534 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
1535 | ret = -EINVAL; | |
1536 | break; | |
1537 | } | |
1538 | ||
1539 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
1540 | break; | |
1541 | ||
99405162 MT |
1542 | case TUNATTACHFILTER: |
1543 | /* Can be set only for TAPs */ | |
1544 | ret = -EINVAL; | |
1545 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1546 | break; | |
1547 | ret = -EFAULT; | |
1548 | if (copy_from_user(&fprog, argp, sizeof(fprog))) | |
1549 | break; | |
1550 | ||
1551 | ret = sk_attach_filter(&fprog, tun->socket.sk); | |
1552 | break; | |
1553 | ||
1554 | case TUNDETACHFILTER: | |
1555 | /* Can be set only for TAPs */ | |
1556 | ret = -EINVAL; | |
1557 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1558 | break; | |
1559 | ret = sk_detach_filter(tun->socket.sk); | |
1560 | break; | |
1561 | ||
1da177e4 | 1562 | default: |
631ab46b EB |
1563 | ret = -EINVAL; |
1564 | break; | |
ee289b64 | 1565 | } |
1da177e4 | 1566 | |
876bfd4d HX |
1567 | unlock: |
1568 | rtnl_unlock(); | |
1569 | if (tun) | |
1570 | tun_put(tun); | |
631ab46b | 1571 | return ret; |
1da177e4 LT |
1572 | } |
1573 | ||
50857e2a AB |
1574 | static long tun_chr_ioctl(struct file *file, |
1575 | unsigned int cmd, unsigned long arg) | |
1576 | { | |
1577 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
1578 | } | |
1579 | ||
1580 | #ifdef CONFIG_COMPAT | |
1581 | static long tun_chr_compat_ioctl(struct file *file, | |
1582 | unsigned int cmd, unsigned long arg) | |
1583 | { | |
1584 | switch (cmd) { | |
1585 | case TUNSETIFF: | |
1586 | case TUNGETIFF: | |
1587 | case TUNSETTXFILTER: | |
1588 | case TUNGETSNDBUF: | |
1589 | case TUNSETSNDBUF: | |
1590 | case SIOCGIFHWADDR: | |
1591 | case SIOCSIFHWADDR: | |
1592 | arg = (unsigned long)compat_ptr(arg); | |
1593 | break; | |
1594 | default: | |
1595 | arg = (compat_ulong_t)arg; | |
1596 | break; | |
1597 | } | |
1598 | ||
1599 | /* | |
1600 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
1601 | * the end of that structure. All fields that are used in this | |
1602 | * driver are compatible though, we don't need to convert the | |
1603 | * contents. | |
1604 | */ | |
1605 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
1606 | } | |
1607 | #endif /* CONFIG_COMPAT */ | |
1608 | ||
1da177e4 LT |
1609 | static int tun_chr_fasync(int fd, struct file *file, int on) |
1610 | { | |
631ab46b | 1611 | struct tun_struct *tun = tun_get(file); |
1da177e4 LT |
1612 | int ret; |
1613 | ||
1614 | if (!tun) | |
1615 | return -EBADFD; | |
1616 | ||
6b8a66ee | 1617 | tun_debug(KERN_INFO, tun, "tun_chr_fasync %d\n", on); |
1da177e4 LT |
1618 | |
1619 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
9d319522 | 1620 | goto out; |
6aa20a22 | 1621 | |
1da177e4 | 1622 | if (on) { |
609d7fa9 | 1623 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 1624 | if (ret) |
9d319522 | 1625 | goto out; |
1da177e4 | 1626 | tun->flags |= TUN_FASYNC; |
6aa20a22 | 1627 | } else |
1da177e4 | 1628 | tun->flags &= ~TUN_FASYNC; |
9d319522 JC |
1629 | ret = 0; |
1630 | out: | |
631ab46b | 1631 | tun_put(tun); |
9d319522 | 1632 | return ret; |
1da177e4 LT |
1633 | } |
1634 | ||
1635 | static int tun_chr_open(struct inode *inode, struct file * file) | |
1636 | { | |
631ab46b | 1637 | struct tun_file *tfile; |
deed49fb | 1638 | |
6b8a66ee | 1639 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b EB |
1640 | |
1641 | tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); | |
1642 | if (!tfile) | |
1643 | return -ENOMEM; | |
c70f1829 | 1644 | atomic_set(&tfile->count, 0); |
631ab46b | 1645 | tfile->tun = NULL; |
36b50bab | 1646 | tfile->net = get_net(current->nsproxy->net_ns); |
631ab46b | 1647 | file->private_data = tfile; |
1da177e4 LT |
1648 | return 0; |
1649 | } | |
1650 | ||
1651 | static int tun_chr_close(struct inode *inode, struct file *file) | |
1652 | { | |
631ab46b | 1653 | struct tun_file *tfile = file->private_data; |
f0a4d0e5 | 1654 | struct tun_struct *tun; |
1da177e4 | 1655 | |
f0a4d0e5 | 1656 | tun = __tun_get(tfile); |
631ab46b | 1657 | if (tun) { |
d23e4365 HX |
1658 | struct net_device *dev = tun->dev; |
1659 | ||
6b8a66ee | 1660 | tun_debug(KERN_INFO, tun, "tun_chr_close\n"); |
1da177e4 | 1661 | |
631ab46b | 1662 | __tun_detach(tun); |
1da177e4 | 1663 | |
3ad2f3fb | 1664 | /* If desirable, unregister the netdevice. */ |
d23e4365 HX |
1665 | if (!(tun->flags & TUN_PERSIST)) { |
1666 | rtnl_lock(); | |
1667 | if (dev->reg_state == NETREG_REGISTERED) | |
1668 | unregister_netdevice(dev); | |
1669 | rtnl_unlock(); | |
1670 | } | |
631ab46b | 1671 | } |
1da177e4 | 1672 | |
9c3fea6a HX |
1673 | tun = tfile->tun; |
1674 | if (tun) | |
89f56d1e | 1675 | sock_put(tun->socket.sk); |
9c3fea6a | 1676 | |
36b50bab | 1677 | put_net(tfile->net); |
631ab46b | 1678 | kfree(tfile); |
1da177e4 LT |
1679 | |
1680 | return 0; | |
1681 | } | |
1682 | ||
d54b1fdb | 1683 | static const struct file_operations tun_fops = { |
6aa20a22 | 1684 | .owner = THIS_MODULE, |
1da177e4 | 1685 | .llseek = no_llseek, |
ee0b3e67 BP |
1686 | .read = do_sync_read, |
1687 | .aio_read = tun_chr_aio_read, | |
1688 | .write = do_sync_write, | |
1689 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 1690 | .poll = tun_chr_poll, |
50857e2a AB |
1691 | .unlocked_ioctl = tun_chr_ioctl, |
1692 | #ifdef CONFIG_COMPAT | |
1693 | .compat_ioctl = tun_chr_compat_ioctl, | |
1694 | #endif | |
1da177e4 LT |
1695 | .open = tun_chr_open, |
1696 | .release = tun_chr_close, | |
6aa20a22 | 1697 | .fasync = tun_chr_fasync |
1da177e4 LT |
1698 | }; |
1699 | ||
1700 | static struct miscdevice tun_miscdev = { | |
1701 | .minor = TUN_MINOR, | |
1702 | .name = "tun", | |
e454cea2 | 1703 | .nodename = "net/tun", |
1da177e4 | 1704 | .fops = &tun_fops, |
1da177e4 LT |
1705 | }; |
1706 | ||
1707 | /* ethtool interface */ | |
1708 | ||
1709 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1710 | { | |
1711 | cmd->supported = 0; | |
1712 | cmd->advertising = 0; | |
70739497 | 1713 | ethtool_cmd_speed_set(cmd, SPEED_10); |
1da177e4 LT |
1714 | cmd->duplex = DUPLEX_FULL; |
1715 | cmd->port = PORT_TP; | |
1716 | cmd->phy_address = 0; | |
1717 | cmd->transceiver = XCVR_INTERNAL; | |
1718 | cmd->autoneg = AUTONEG_DISABLE; | |
1719 | cmd->maxtxpkt = 0; | |
1720 | cmd->maxrxpkt = 0; | |
1721 | return 0; | |
1722 | } | |
1723 | ||
1724 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
1725 | { | |
1726 | struct tun_struct *tun = netdev_priv(dev); | |
1727 | ||
33a5ba14 RJ |
1728 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
1729 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
1730 | |
1731 | switch (tun->flags & TUN_TYPE_MASK) { | |
1732 | case TUN_TUN_DEV: | |
33a5ba14 | 1733 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 LT |
1734 | break; |
1735 | case TUN_TAP_DEV: | |
33a5ba14 | 1736 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
1737 | break; |
1738 | } | |
1739 | } | |
1740 | ||
1741 | static u32 tun_get_msglevel(struct net_device *dev) | |
1742 | { | |
1743 | #ifdef TUN_DEBUG | |
1744 | struct tun_struct *tun = netdev_priv(dev); | |
1745 | return tun->debug; | |
1746 | #else | |
1747 | return -EOPNOTSUPP; | |
1748 | #endif | |
1749 | } | |
1750 | ||
1751 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
1752 | { | |
1753 | #ifdef TUN_DEBUG | |
1754 | struct tun_struct *tun = netdev_priv(dev); | |
1755 | tun->debug = value; | |
1756 | #endif | |
1757 | } | |
1758 | ||
7282d491 | 1759 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
1760 | .get_settings = tun_get_settings, |
1761 | .get_drvinfo = tun_get_drvinfo, | |
1762 | .get_msglevel = tun_get_msglevel, | |
1763 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 1764 | .get_link = ethtool_op_get_link, |
1da177e4 LT |
1765 | }; |
1766 | ||
79d17604 | 1767 | |
1da177e4 LT |
1768 | static int __init tun_init(void) |
1769 | { | |
1770 | int ret = 0; | |
1771 | ||
6b8a66ee JP |
1772 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
1773 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 1774 | |
f019a7a5 | 1775 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 1776 | if (ret) { |
6b8a66ee | 1777 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 1778 | goto err_linkops; |
79d17604 PE |
1779 | } |
1780 | ||
1da177e4 | 1781 | ret = misc_register(&tun_miscdev); |
79d17604 | 1782 | if (ret) { |
6b8a66ee | 1783 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
1784 | goto err_misc; |
1785 | } | |
f019a7a5 | 1786 | return 0; |
79d17604 | 1787 | err_misc: |
f019a7a5 EB |
1788 | rtnl_link_unregister(&tun_link_ops); |
1789 | err_linkops: | |
1da177e4 LT |
1790 | return ret; |
1791 | } | |
1792 | ||
1793 | static void tun_cleanup(void) | |
1794 | { | |
6aa20a22 | 1795 | misc_deregister(&tun_miscdev); |
f019a7a5 | 1796 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
1797 | } |
1798 | ||
05c2828c MT |
1799 | /* Get an underlying socket object from tun file. Returns error unless file is |
1800 | * attached to a device. The returned object works like a packet socket, it | |
1801 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
1802 | * holding a reference to the file for as long as the socket is in use. */ | |
1803 | struct socket *tun_get_socket(struct file *file) | |
1804 | { | |
1805 | struct tun_struct *tun; | |
1806 | if (file->f_op != &tun_fops) | |
1807 | return ERR_PTR(-EINVAL); | |
1808 | tun = tun_get(file); | |
1809 | if (!tun) | |
1810 | return ERR_PTR(-EBADFD); | |
1811 | tun_put(tun); | |
1812 | return &tun->socket; | |
1813 | } | |
1814 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
1815 | ||
1da177e4 LT |
1816 | module_init(tun_init); |
1817 | module_exit(tun_cleanup); | |
1818 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1819 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1820 | MODULE_LICENSE("GPL"); | |
1821 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 1822 | MODULE_ALIAS("devname:net/tun"); |