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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * TUN - Universal TUN/TAP device driver. | |
3 | * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Changes: | |
20 | * | |
ff4cc3ac MK |
21 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
22 | * Add TUNSETLINK ioctl to set the link encapsulation | |
23 | * | |
1da177e4 | 24 | * Mark Smith <markzzzsmith@yahoo.com.au> |
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; |
0625c883 EB |
123 | kuid_t owner; |
124 | kgid_t group; | |
14daa021 | 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; |
38231b7a | 190 | netif_tx_unlock_bh(tun->dev); |
631ab46b EB |
191 | |
192 | /* Drop read queue */ | |
89f56d1e | 193 | skb_queue_purge(&tun->socket.sk->sk_receive_queue); |
c70f1829 EB |
194 | |
195 | /* Drop the extra count on the net device */ | |
196 | dev_put(tun->dev); | |
197 | } | |
198 | ||
199 | static void tun_detach(struct tun_struct *tun) | |
200 | { | |
201 | rtnl_lock(); | |
202 | __tun_detach(tun); | |
203 | rtnl_unlock(); | |
631ab46b EB |
204 | } |
205 | ||
206 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
207 | { | |
c70f1829 EB |
208 | struct tun_struct *tun = NULL; |
209 | ||
210 | if (atomic_inc_not_zero(&tfile->count)) | |
211 | tun = tfile->tun; | |
212 | ||
213 | return tun; | |
631ab46b EB |
214 | } |
215 | ||
216 | static struct tun_struct *tun_get(struct file *file) | |
217 | { | |
218 | return __tun_get(file->private_data); | |
219 | } | |
220 | ||
221 | static void tun_put(struct tun_struct *tun) | |
222 | { | |
c70f1829 EB |
223 | struct tun_file *tfile = tun->tfile; |
224 | ||
225 | if (atomic_dec_and_test(&tfile->count)) | |
226 | tun_detach(tfile->tun); | |
631ab46b EB |
227 | } |
228 | ||
6b8a66ee | 229 | /* TAP filtering */ |
f271b2cc MK |
230 | static void addr_hash_set(u32 *mask, const u8 *addr) |
231 | { | |
232 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
233 | mask[n >> 5] |= (1 << (n & 31)); | |
234 | } | |
235 | ||
236 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
237 | { | |
238 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
239 | return mask[n >> 5] & (1 << (n & 31)); | |
240 | } | |
241 | ||
242 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
243 | { | |
244 | struct { u8 u[ETH_ALEN]; } *addr; | |
245 | struct tun_filter uf; | |
246 | int err, alen, n, nexact; | |
247 | ||
248 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
249 | return -EFAULT; | |
250 | ||
251 | if (!uf.count) { | |
252 | /* Disabled */ | |
253 | filter->count = 0; | |
254 | return 0; | |
255 | } | |
256 | ||
257 | alen = ETH_ALEN * uf.count; | |
258 | addr = kmalloc(alen, GFP_KERNEL); | |
259 | if (!addr) | |
260 | return -ENOMEM; | |
261 | ||
262 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
263 | err = -EFAULT; | |
264 | goto done; | |
265 | } | |
266 | ||
267 | /* The filter is updated without holding any locks. Which is | |
268 | * perfectly safe. We disable it first and in the worst | |
269 | * case we'll accept a few undesired packets. */ | |
270 | filter->count = 0; | |
271 | wmb(); | |
272 | ||
273 | /* Use first set of addresses as an exact filter */ | |
274 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
275 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
276 | ||
277 | nexact = n; | |
278 | ||
cfbf84fc AW |
279 | /* Remaining multicast addresses are hashed, |
280 | * unicast will leave the filter disabled. */ | |
f271b2cc | 281 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
282 | for (; n < uf.count; n++) { |
283 | if (!is_multicast_ether_addr(addr[n].u)) { | |
284 | err = 0; /* no filter */ | |
285 | goto done; | |
286 | } | |
f271b2cc | 287 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 288 | } |
f271b2cc MK |
289 | |
290 | /* For ALLMULTI just set the mask to all ones. | |
291 | * This overrides the mask populated above. */ | |
292 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
293 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
294 | ||
295 | /* Now enable the filter */ | |
296 | wmb(); | |
297 | filter->count = nexact; | |
298 | ||
299 | /* Return the number of exact filters */ | |
300 | err = nexact; | |
301 | ||
302 | done: | |
303 | kfree(addr); | |
304 | return err; | |
305 | } | |
306 | ||
307 | /* Returns: 0 - drop, !=0 - accept */ | |
308 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
309 | { | |
310 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
311 | * at this point. */ | |
312 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
313 | int i; | |
314 | ||
315 | /* Exact match */ | |
316 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 317 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
318 | return 1; |
319 | ||
320 | /* Inexact match (multicast only) */ | |
321 | if (is_multicast_ether_addr(eh->h_dest)) | |
322 | return addr_hash_test(filter->mask, eh->h_dest); | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Checks whether the packet is accepted or not. | |
329 | * Returns: 0 - drop, !=0 - accept | |
330 | */ | |
331 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
332 | { | |
333 | if (!filter->count) | |
334 | return 1; | |
335 | ||
336 | return run_filter(filter, skb); | |
337 | } | |
338 | ||
1da177e4 LT |
339 | /* Network device part of the driver */ |
340 | ||
7282d491 | 341 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 342 | |
c70f1829 EB |
343 | /* Net device detach from fd. */ |
344 | static void tun_net_uninit(struct net_device *dev) | |
345 | { | |
346 | struct tun_struct *tun = netdev_priv(dev); | |
347 | struct tun_file *tfile = tun->tfile; | |
348 | ||
349 | /* Inform the methods they need to stop using the dev. | |
350 | */ | |
351 | if (tfile) { | |
43815482 | 352 | wake_up_all(&tun->wq.wait); |
c70f1829 EB |
353 | if (atomic_dec_and_test(&tfile->count)) |
354 | __tun_detach(tun); | |
355 | } | |
356 | } | |
357 | ||
9c3fea6a HX |
358 | static void tun_free_netdev(struct net_device *dev) |
359 | { | |
360 | struct tun_struct *tun = netdev_priv(dev); | |
361 | ||
b09e786b MP |
362 | BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED, &tun->socket.flags)); |
363 | ||
1ab5ecb9 | 364 | sk_release_kernel(tun->socket.sk); |
9c3fea6a HX |
365 | } |
366 | ||
1da177e4 LT |
367 | /* Net device open. */ |
368 | static int tun_net_open(struct net_device *dev) | |
369 | { | |
370 | netif_start_queue(dev); | |
371 | return 0; | |
372 | } | |
373 | ||
374 | /* Net device close. */ | |
375 | static int tun_net_close(struct net_device *dev) | |
376 | { | |
377 | netif_stop_queue(dev); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | /* Net device start xmit */ | |
424efe9c | 382 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
383 | { |
384 | struct tun_struct *tun = netdev_priv(dev); | |
385 | ||
6b8a66ee | 386 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
1da177e4 LT |
387 | |
388 | /* Drop packet if interface is not attached */ | |
631ab46b | 389 | if (!tun->tfile) |
1da177e4 LT |
390 | goto drop; |
391 | ||
f271b2cc MK |
392 | /* Drop if the filter does not like it. |
393 | * This is a noop if the filter is disabled. | |
394 | * Filter can be enabled only for the TAP devices. */ | |
395 | if (!check_filter(&tun->txflt, skb)) | |
396 | goto drop; | |
397 | ||
99405162 MT |
398 | if (tun->socket.sk->sk_filter && |
399 | sk_filter(tun->socket.sk, skb)) | |
400 | goto drop; | |
401 | ||
89f56d1e | 402 | if (skb_queue_len(&tun->socket.sk->sk_receive_queue) >= dev->tx_queue_len) { |
1da177e4 LT |
403 | if (!(tun->flags & TUN_ONE_QUEUE)) { |
404 | /* Normal queueing mode. */ | |
405 | /* Packet scheduler handles dropping of further packets. */ | |
406 | netif_stop_queue(dev); | |
407 | ||
408 | /* We won't see all dropped packets individually, so overrun | |
409 | * error is more appropriate. */ | |
09f75cd7 | 410 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
411 | } else { |
412 | /* Single queue mode. | |
413 | * Driver handles dropping of all packets itself. */ | |
414 | goto drop; | |
415 | } | |
416 | } | |
417 | ||
0110d6f2 MT |
418 | /* Orphan the skb - required as we might hang on to it |
419 | * for indefinite time. */ | |
868eefeb MT |
420 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
421 | goto drop; | |
0110d6f2 MT |
422 | skb_orphan(skb); |
423 | ||
f271b2cc | 424 | /* Enqueue packet */ |
89f56d1e | 425 | skb_queue_tail(&tun->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
426 | |
427 | /* Notify and wake up reader process */ | |
428 | if (tun->flags & TUN_FASYNC) | |
429 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
43815482 | 430 | wake_up_interruptible_poll(&tun->wq.wait, POLLIN | |
05c2828c | 431 | POLLRDNORM | POLLRDBAND); |
6ed10654 | 432 | return NETDEV_TX_OK; |
1da177e4 LT |
433 | |
434 | drop: | |
09f75cd7 | 435 | dev->stats.tx_dropped++; |
1da177e4 | 436 | kfree_skb(skb); |
6ed10654 | 437 | return NETDEV_TX_OK; |
1da177e4 LT |
438 | } |
439 | ||
f271b2cc | 440 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 441 | { |
f271b2cc MK |
442 | /* |
443 | * This callback is supposed to deal with mc filter in | |
444 | * _rx_ path and has nothing to do with the _tx_ path. | |
445 | * In rx path we always accept everything userspace gives us. | |
446 | */ | |
1da177e4 LT |
447 | } |
448 | ||
4885a504 ES |
449 | #define MIN_MTU 68 |
450 | #define MAX_MTU 65535 | |
451 | ||
452 | static int | |
453 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
454 | { | |
455 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
456 | return -EINVAL; | |
457 | dev->mtu = new_mtu; | |
458 | return 0; | |
459 | } | |
460 | ||
c8f44aff MM |
461 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
462 | netdev_features_t features) | |
88255375 MM |
463 | { |
464 | struct tun_struct *tun = netdev_priv(dev); | |
465 | ||
466 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
467 | } | |
bebd097a NH |
468 | #ifdef CONFIG_NET_POLL_CONTROLLER |
469 | static void tun_poll_controller(struct net_device *dev) | |
470 | { | |
471 | /* | |
472 | * Tun only receives frames when: | |
473 | * 1) the char device endpoint gets data from user space | |
474 | * 2) the tun socket gets a sendmsg call from user space | |
475 | * Since both of those are syncronous operations, we are guaranteed | |
476 | * never to have pending data when we poll for it | |
477 | * so theres nothing to do here but return. | |
478 | * We need this though so netpoll recognizes us as an interface that | |
479 | * supports polling, which enables bridge devices in virt setups to | |
480 | * still use netconsole | |
481 | */ | |
482 | return; | |
483 | } | |
484 | #endif | |
758e43b7 | 485 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 486 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
487 | .ndo_open = tun_net_open, |
488 | .ndo_stop = tun_net_close, | |
00829823 | 489 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 490 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 491 | .ndo_fix_features = tun_net_fix_features, |
bebd097a NH |
492 | #ifdef CONFIG_NET_POLL_CONTROLLER |
493 | .ndo_poll_controller = tun_poll_controller, | |
494 | #endif | |
758e43b7 SH |
495 | }; |
496 | ||
497 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 498 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
499 | .ndo_open = tun_net_open, |
500 | .ndo_stop = tun_net_close, | |
00829823 | 501 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 502 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 503 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 504 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
505 | .ndo_set_mac_address = eth_mac_addr, |
506 | .ndo_validate_addr = eth_validate_addr, | |
bebd097a NH |
507 | #ifdef CONFIG_NET_POLL_CONTROLLER |
508 | .ndo_poll_controller = tun_poll_controller, | |
509 | #endif | |
758e43b7 SH |
510 | }; |
511 | ||
1da177e4 LT |
512 | /* Initialize net device. */ |
513 | static void tun_net_init(struct net_device *dev) | |
514 | { | |
515 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 516 | |
1da177e4 LT |
517 | switch (tun->flags & TUN_TYPE_MASK) { |
518 | case TUN_TUN_DEV: | |
758e43b7 SH |
519 | dev->netdev_ops = &tun_netdev_ops; |
520 | ||
1da177e4 LT |
521 | /* Point-to-Point TUN Device */ |
522 | dev->hard_header_len = 0; | |
523 | dev->addr_len = 0; | |
524 | dev->mtu = 1500; | |
525 | ||
526 | /* Zero header length */ | |
6aa20a22 | 527 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
528 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
529 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
530 | break; | |
531 | ||
532 | case TUN_TAP_DEV: | |
7a0a9608 | 533 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 534 | /* Ethernet TAP Device */ |
1da177e4 | 535 | ether_setup(dev); |
550fd08c | 536 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
36226a8d | 537 | |
f2cedb63 | 538 | eth_hw_addr_random(dev); |
36226a8d | 539 | |
1da177e4 LT |
540 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
541 | break; | |
542 | } | |
543 | } | |
544 | ||
545 | /* Character device part */ | |
546 | ||
547 | /* Poll */ | |
548 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 549 | { |
b2430de3 EB |
550 | struct tun_file *tfile = file->private_data; |
551 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 552 | struct sock *sk; |
33dccbb0 | 553 | unsigned int mask = 0; |
1da177e4 LT |
554 | |
555 | if (!tun) | |
eac9e902 | 556 | return POLLERR; |
1da177e4 | 557 | |
89f56d1e | 558 | sk = tun->socket.sk; |
3c8a9c63 | 559 | |
6b8a66ee | 560 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 561 | |
43815482 | 562 | poll_wait(file, &tun->wq.wait, wait); |
6aa20a22 | 563 | |
89f56d1e | 564 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
565 | mask |= POLLIN | POLLRDNORM; |
566 | ||
33dccbb0 HX |
567 | if (sock_writeable(sk) || |
568 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
569 | sock_writeable(sk))) | |
570 | mask |= POLLOUT | POLLWRNORM; | |
571 | ||
c70f1829 EB |
572 | if (tun->dev->reg_state != NETREG_REGISTERED) |
573 | mask = POLLERR; | |
574 | ||
631ab46b | 575 | tun_put(tun); |
1da177e4 LT |
576 | return mask; |
577 | } | |
578 | ||
f42157cb RR |
579 | /* prepad is the amount to reserve at front. len is length after that. |
580 | * linear is a hint as to how much to copy (usually headers). */ | |
6f7c156c | 581 | static struct sk_buff *tun_alloc_skb(struct tun_struct *tun, |
582 | size_t prepad, size_t len, | |
583 | size_t linear, int noblock) | |
f42157cb | 584 | { |
89f56d1e | 585 | struct sock *sk = tun->socket.sk; |
f42157cb | 586 | struct sk_buff *skb; |
33dccbb0 | 587 | int err; |
f42157cb RR |
588 | |
589 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 590 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 591 | linear = len; |
f42157cb | 592 | |
33dccbb0 HX |
593 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
594 | &err); | |
f42157cb | 595 | if (!skb) |
33dccbb0 | 596 | return ERR_PTR(err); |
f42157cb RR |
597 | |
598 | skb_reserve(skb, prepad); | |
599 | skb_put(skb, linear); | |
33dccbb0 HX |
600 | skb->data_len = len - linear; |
601 | skb->len += len - linear; | |
f42157cb RR |
602 | |
603 | return skb; | |
604 | } | |
605 | ||
0690899b MT |
606 | /* set skb frags from iovec, this can move to core network code for reuse */ |
607 | static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from, | |
608 | int offset, size_t count) | |
609 | { | |
610 | int len = iov_length(from, count) - offset; | |
611 | int copy = skb_headlen(skb); | |
612 | int size, offset1 = 0; | |
613 | int i = 0; | |
614 | ||
615 | /* Skip over from offset */ | |
616 | while (count && (offset >= from->iov_len)) { | |
617 | offset -= from->iov_len; | |
618 | ++from; | |
619 | --count; | |
620 | } | |
621 | ||
622 | /* copy up to skb headlen */ | |
623 | while (count && (copy > 0)) { | |
624 | size = min_t(unsigned int, copy, from->iov_len - offset); | |
625 | if (copy_from_user(skb->data + offset1, from->iov_base + offset, | |
626 | size)) | |
627 | return -EFAULT; | |
628 | if (copy > size) { | |
629 | ++from; | |
630 | --count; | |
631 | offset = 0; | |
632 | } else | |
633 | offset += size; | |
634 | copy -= size; | |
635 | offset1 += size; | |
636 | } | |
637 | ||
638 | if (len == offset1) | |
639 | return 0; | |
640 | ||
641 | while (count--) { | |
642 | struct page *page[MAX_SKB_FRAGS]; | |
643 | int num_pages; | |
644 | unsigned long base; | |
645 | unsigned long truesize; | |
646 | ||
647 | len = from->iov_len - offset; | |
648 | if (!len) { | |
649 | offset = 0; | |
650 | ++from; | |
651 | continue; | |
652 | } | |
653 | base = (unsigned long)from->iov_base + offset; | |
654 | size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT; | |
655 | if (i + size > MAX_SKB_FRAGS) | |
656 | return -EMSGSIZE; | |
657 | num_pages = get_user_pages_fast(base, size, 0, &page[i]); | |
658 | if (num_pages != size) { | |
659 | for (i = 0; i < num_pages; i++) | |
660 | put_page(page[i]); | |
661 | return -EFAULT; | |
662 | } | |
663 | truesize = size * PAGE_SIZE; | |
664 | skb->data_len += len; | |
665 | skb->len += len; | |
666 | skb->truesize += truesize; | |
667 | atomic_add(truesize, &skb->sk->sk_wmem_alloc); | |
668 | while (len) { | |
669 | int off = base & ~PAGE_MASK; | |
670 | int size = min_t(int, len, PAGE_SIZE - off); | |
671 | __skb_fill_page_desc(skb, i, page[i], off, size); | |
672 | skb_shinfo(skb)->nr_frags++; | |
673 | /* increase sk_wmem_alloc */ | |
674 | base += size; | |
675 | len -= size; | |
676 | i++; | |
677 | } | |
678 | offset = 0; | |
679 | ++from; | |
680 | } | |
681 | return 0; | |
682 | } | |
683 | ||
1da177e4 | 684 | /* Get packet from user space buffer */ |
0690899b MT |
685 | static ssize_t tun_get_user(struct tun_struct *tun, void *msg_control, |
686 | const struct iovec *iv, size_t total_len, | |
687 | size_t count, int noblock) | |
1da177e4 | 688 | { |
09640e63 | 689 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 690 | struct sk_buff *skb; |
0690899b | 691 | size_t len = total_len, align = NET_SKB_PAD; |
f43798c2 | 692 | struct virtio_net_hdr gso = { 0 }; |
6f26c9a7 | 693 | int offset = 0; |
0690899b MT |
694 | int copylen; |
695 | bool zerocopy = false; | |
696 | int err; | |
1da177e4 LT |
697 | |
698 | if (!(tun->flags & TUN_NO_PI)) { | |
0690899b | 699 | if ((len -= sizeof(pi)) > total_len) |
1da177e4 LT |
700 | return -EINVAL; |
701 | ||
6f26c9a7 | 702 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 703 | return -EFAULT; |
6f26c9a7 | 704 | offset += sizeof(pi); |
1da177e4 LT |
705 | } |
706 | ||
f43798c2 | 707 | if (tun->flags & TUN_VNET_HDR) { |
0690899b | 708 | if ((len -= tun->vnet_hdr_sz) > total_len) |
f43798c2 RR |
709 | return -EINVAL; |
710 | ||
6f26c9a7 | 711 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
712 | return -EFAULT; |
713 | ||
4909122f HX |
714 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
715 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
716 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
717 | ||
f43798c2 RR |
718 | if (gso.hdr_len > len) |
719 | return -EINVAL; | |
d9d52b51 | 720 | offset += tun->vnet_hdr_sz; |
f43798c2 RR |
721 | } |
722 | ||
e01bf1c8 | 723 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
a504b86e | 724 | align += NET_IP_ALIGN; |
0eca93bc HX |
725 | if (unlikely(len < ETH_HLEN || |
726 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
727 | return -EINVAL; |
728 | } | |
6aa20a22 | 729 | |
0690899b MT |
730 | if (msg_control) |
731 | zerocopy = true; | |
732 | ||
733 | if (zerocopy) { | |
734 | /* Userspace may produce vectors with count greater than | |
735 | * MAX_SKB_FRAGS, so we need to linearize parts of the skb | |
736 | * to let the rest of data to be fit in the frags. | |
737 | */ | |
738 | if (count > MAX_SKB_FRAGS) { | |
739 | copylen = iov_length(iv, count - MAX_SKB_FRAGS); | |
740 | if (copylen < offset) | |
741 | copylen = 0; | |
742 | else | |
743 | copylen -= offset; | |
744 | } else | |
745 | copylen = 0; | |
746 | /* There are 256 bytes to be copied in skb, so there is enough | |
747 | * room for skb expand head in case it is used. | |
748 | * The rest of the buffer is mapped from userspace. | |
749 | */ | |
750 | if (copylen < gso.hdr_len) | |
751 | copylen = gso.hdr_len; | |
752 | if (!copylen) | |
753 | copylen = GOODCOPY_LEN; | |
754 | } else | |
755 | copylen = len; | |
756 | ||
757 | skb = tun_alloc_skb(tun, align, copylen, gso.hdr_len, noblock); | |
33dccbb0 HX |
758 | if (IS_ERR(skb)) { |
759 | if (PTR_ERR(skb) != -EAGAIN) | |
760 | tun->dev->stats.rx_dropped++; | |
761 | return PTR_ERR(skb); | |
1da177e4 LT |
762 | } |
763 | ||
0690899b MT |
764 | if (zerocopy) |
765 | err = zerocopy_sg_from_iovec(skb, iv, offset, count); | |
766 | else | |
767 | err = skb_copy_datagram_from_iovec(skb, 0, iv, offset, len); | |
768 | ||
769 | if (err) { | |
09f75cd7 | 770 | tun->dev->stats.rx_dropped++; |
8f22757e | 771 | kfree_skb(skb); |
1da177e4 | 772 | return -EFAULT; |
8f22757e | 773 | } |
1da177e4 | 774 | |
f43798c2 RR |
775 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
776 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
777 | gso.csum_offset)) { | |
778 | tun->dev->stats.rx_frame_errors++; | |
779 | kfree_skb(skb); | |
780 | return -EINVAL; | |
781 | } | |
88255375 | 782 | } |
f43798c2 | 783 | |
1da177e4 LT |
784 | switch (tun->flags & TUN_TYPE_MASK) { |
785 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
786 | if (tun->flags & TUN_NO_PI) { |
787 | switch (skb->data[0] & 0xf0) { | |
788 | case 0x40: | |
789 | pi.proto = htons(ETH_P_IP); | |
790 | break; | |
791 | case 0x60: | |
792 | pi.proto = htons(ETH_P_IPV6); | |
793 | break; | |
794 | default: | |
795 | tun->dev->stats.rx_dropped++; | |
796 | kfree_skb(skb); | |
797 | return -EINVAL; | |
798 | } | |
799 | } | |
800 | ||
459a98ed | 801 | skb_reset_mac_header(skb); |
1da177e4 | 802 | skb->protocol = pi.proto; |
4c13eb66 | 803 | skb->dev = tun->dev; |
1da177e4 LT |
804 | break; |
805 | case TUN_TAP_DEV: | |
806 | skb->protocol = eth_type_trans(skb, tun->dev); | |
807 | break; | |
6403eab1 | 808 | } |
1da177e4 | 809 | |
f43798c2 RR |
810 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
811 | pr_debug("GSO!\n"); | |
812 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
813 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
814 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
815 | break; | |
816 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
817 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
818 | break; | |
e36aa25a SS |
819 | case VIRTIO_NET_HDR_GSO_UDP: |
820 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
821 | break; | |
f43798c2 RR |
822 | default: |
823 | tun->dev->stats.rx_frame_errors++; | |
824 | kfree_skb(skb); | |
825 | return -EINVAL; | |
826 | } | |
827 | ||
828 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
829 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
830 | ||
831 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
832 | if (skb_shinfo(skb)->gso_size == 0) { | |
833 | tun->dev->stats.rx_frame_errors++; | |
834 | kfree_skb(skb); | |
835 | return -EINVAL; | |
836 | } | |
837 | ||
838 | /* Header must be checked, and gso_segs computed. */ | |
839 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
840 | skb_shinfo(skb)->gso_segs = 0; | |
841 | } | |
6aa20a22 | 842 | |
0690899b MT |
843 | /* copy skb_ubuf_info for callback when skb has no error */ |
844 | if (zerocopy) { | |
845 | skb_shinfo(skb)->destructor_arg = msg_control; | |
846 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
847 | } | |
848 | ||
1da177e4 | 849 | netif_rx_ni(skb); |
6aa20a22 | 850 | |
09f75cd7 JG |
851 | tun->dev->stats.rx_packets++; |
852 | tun->dev->stats.rx_bytes += len; | |
1da177e4 | 853 | |
0690899b | 854 | return total_len; |
6aa20a22 | 855 | } |
1da177e4 | 856 | |
ee0b3e67 BP |
857 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
858 | unsigned long count, loff_t pos) | |
1da177e4 | 859 | { |
33dccbb0 | 860 | struct file *file = iocb->ki_filp; |
ab46d779 | 861 | struct tun_struct *tun = tun_get(file); |
631ab46b | 862 | ssize_t result; |
1da177e4 LT |
863 | |
864 | if (!tun) | |
865 | return -EBADFD; | |
866 | ||
6b8a66ee | 867 | tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count); |
1da177e4 | 868 | |
0690899b | 869 | result = tun_get_user(tun, NULL, iv, iov_length(iv, count), count, |
33dccbb0 | 870 | file->f_flags & O_NONBLOCK); |
631ab46b EB |
871 | |
872 | tun_put(tun); | |
873 | return result; | |
1da177e4 LT |
874 | } |
875 | ||
1da177e4 | 876 | /* Put packet to the user space buffer */ |
6f7c156c | 877 | static ssize_t tun_put_user(struct tun_struct *tun, |
878 | struct sk_buff *skb, | |
879 | const struct iovec *iv, int len) | |
1da177e4 LT |
880 | { |
881 | struct tun_pi pi = { 0, skb->protocol }; | |
882 | ssize_t total = 0; | |
883 | ||
884 | if (!(tun->flags & TUN_NO_PI)) { | |
885 | if ((len -= sizeof(pi)) < 0) | |
886 | return -EINVAL; | |
887 | ||
888 | if (len < skb->len) { | |
889 | /* Packet will be striped */ | |
890 | pi.flags |= TUN_PKT_STRIP; | |
891 | } | |
6aa20a22 | 892 | |
43b39dcd | 893 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
894 | return -EFAULT; |
895 | total += sizeof(pi); | |
6aa20a22 | 896 | } |
1da177e4 | 897 | |
f43798c2 RR |
898 | if (tun->flags & TUN_VNET_HDR) { |
899 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
d9d52b51 | 900 | if ((len -= tun->vnet_hdr_sz) < 0) |
f43798c2 RR |
901 | return -EINVAL; |
902 | ||
903 | if (skb_is_gso(skb)) { | |
904 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
905 | ||
906 | /* This is a hint as to how much should be linear. */ | |
907 | gso.hdr_len = skb_headlen(skb); | |
908 | gso.gso_size = sinfo->gso_size; | |
909 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
910 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
911 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
912 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e36aa25a SS |
913 | else if (sinfo->gso_type & SKB_GSO_UDP) |
914 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
ef3db4a5 | 915 | else { |
6b8a66ee | 916 | pr_err("unexpected GSO type: " |
ef3db4a5 MT |
917 | "0x%x, gso_size %d, hdr_len %d\n", |
918 | sinfo->gso_type, gso.gso_size, | |
919 | gso.hdr_len); | |
920 | print_hex_dump(KERN_ERR, "tun: ", | |
921 | DUMP_PREFIX_NONE, | |
922 | 16, 1, skb->head, | |
923 | min((int)gso.hdr_len, 64), true); | |
924 | WARN_ON_ONCE(1); | |
925 | return -EINVAL; | |
926 | } | |
f43798c2 RR |
927 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
928 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
929 | } else | |
930 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
931 | ||
932 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
933 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 934 | gso.csum_start = skb_checksum_start_offset(skb); |
f43798c2 | 935 | gso.csum_offset = skb->csum_offset; |
10a8d94a JW |
936 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
937 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
f43798c2 RR |
938 | } /* else everything is zero */ |
939 | ||
43b39dcd MT |
940 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
941 | sizeof(gso)))) | |
f43798c2 | 942 | return -EFAULT; |
d9d52b51 | 943 | total += tun->vnet_hdr_sz; |
f43798c2 RR |
944 | } |
945 | ||
1da177e4 LT |
946 | len = min_t(int, skb->len, len); |
947 | ||
43b39dcd | 948 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
05c2828c | 949 | total += skb->len; |
1da177e4 | 950 | |
09f75cd7 JG |
951 | tun->dev->stats.tx_packets++; |
952 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
953 | |
954 | return total; | |
955 | } | |
956 | ||
05c2828c MT |
957 | static ssize_t tun_do_read(struct tun_struct *tun, |
958 | struct kiocb *iocb, const struct iovec *iv, | |
959 | ssize_t len, int noblock) | |
1da177e4 | 960 | { |
1da177e4 LT |
961 | DECLARE_WAITQUEUE(wait, current); |
962 | struct sk_buff *skb; | |
05c2828c | 963 | ssize_t ret = 0; |
1da177e4 | 964 | |
6b8a66ee | 965 | tun_debug(KERN_INFO, tun, "tun_chr_read\n"); |
1da177e4 | 966 | |
61a5ff15 AK |
967 | if (unlikely(!noblock)) |
968 | add_wait_queue(&tun->wq.wait, &wait); | |
1da177e4 | 969 | while (len) { |
1da177e4 LT |
970 | current->state = TASK_INTERRUPTIBLE; |
971 | ||
972 | /* Read frames from the queue */ | |
89f56d1e | 973 | if (!(skb=skb_dequeue(&tun->socket.sk->sk_receive_queue))) { |
05c2828c | 974 | if (noblock) { |
1da177e4 LT |
975 | ret = -EAGAIN; |
976 | break; | |
977 | } | |
978 | if (signal_pending(current)) { | |
979 | ret = -ERESTARTSYS; | |
980 | break; | |
981 | } | |
c70f1829 EB |
982 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
983 | ret = -EIO; | |
984 | break; | |
985 | } | |
1da177e4 LT |
986 | |
987 | /* Nothing to read, let's sleep */ | |
988 | schedule(); | |
989 | continue; | |
990 | } | |
991 | netif_wake_queue(tun->dev); | |
992 | ||
43b39dcd | 993 | ret = tun_put_user(tun, skb, iv, len); |
f271b2cc MK |
994 | kfree_skb(skb); |
995 | break; | |
1da177e4 LT |
996 | } |
997 | ||
998 | current->state = TASK_RUNNING; | |
61a5ff15 AK |
999 | if (unlikely(!noblock)) |
1000 | remove_wait_queue(&tun->wq.wait, &wait); | |
1da177e4 | 1001 | |
05c2828c MT |
1002 | return ret; |
1003 | } | |
1004 | ||
1005 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
1006 | unsigned long count, loff_t pos) | |
1007 | { | |
1008 | struct file *file = iocb->ki_filp; | |
1009 | struct tun_file *tfile = file->private_data; | |
1010 | struct tun_struct *tun = __tun_get(tfile); | |
1011 | ssize_t len, ret; | |
1012 | ||
1013 | if (!tun) | |
1014 | return -EBADFD; | |
1015 | len = iov_length(iv, count); | |
1016 | if (len < 0) { | |
1017 | ret = -EINVAL; | |
1018 | goto out; | |
1019 | } | |
1020 | ||
1021 | ret = tun_do_read(tun, iocb, iv, len, file->f_flags & O_NONBLOCK); | |
1022 | ret = min_t(ssize_t, ret, len); | |
631ab46b EB |
1023 | out: |
1024 | tun_put(tun); | |
1da177e4 LT |
1025 | return ret; |
1026 | } | |
1027 | ||
1da177e4 LT |
1028 | static void tun_setup(struct net_device *dev) |
1029 | { | |
1030 | struct tun_struct *tun = netdev_priv(dev); | |
1031 | ||
0625c883 EB |
1032 | tun->owner = INVALID_UID; |
1033 | tun->group = INVALID_GID; | |
1da177e4 | 1034 | |
1da177e4 | 1035 | dev->ethtool_ops = &tun_ethtool_ops; |
9c3fea6a | 1036 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
1037 | } |
1038 | ||
f019a7a5 EB |
1039 | /* Trivial set of netlink ops to allow deleting tun or tap |
1040 | * device with netlink. | |
1041 | */ | |
1042 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1043 | { | |
1044 | return -EINVAL; | |
1045 | } | |
1046 | ||
1047 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1048 | .kind = DRV_NAME, | |
1049 | .priv_size = sizeof(struct tun_struct), | |
1050 | .setup = tun_setup, | |
1051 | .validate = tun_validate, | |
1052 | }; | |
1053 | ||
33dccbb0 HX |
1054 | static void tun_sock_write_space(struct sock *sk) |
1055 | { | |
1056 | struct tun_struct *tun; | |
43815482 | 1057 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1058 | |
1059 | if (!sock_writeable(sk)) | |
1060 | return; | |
1061 | ||
33dccbb0 HX |
1062 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
1063 | return; | |
1064 | ||
43815482 ED |
1065 | wqueue = sk_sleep(sk); |
1066 | if (wqueue && waitqueue_active(wqueue)) | |
1067 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1068 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1069 | |
80924e5f | 1070 | tun = tun_sk(sk)->tun; |
33dccbb0 HX |
1071 | kill_fasync(&tun->fasync, SIGIO, POLL_OUT); |
1072 | } | |
1073 | ||
1074 | static void tun_sock_destruct(struct sock *sk) | |
1075 | { | |
80924e5f | 1076 | free_netdev(tun_sk(sk)->tun->dev); |
33dccbb0 HX |
1077 | } |
1078 | ||
05c2828c MT |
1079 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
1080 | struct msghdr *m, size_t total_len) | |
1081 | { | |
1082 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
0690899b MT |
1083 | return tun_get_user(tun, m->msg_control, m->msg_iov, total_len, |
1084 | m->msg_iovlen, m->msg_flags & MSG_DONTWAIT); | |
05c2828c MT |
1085 | } |
1086 | ||
1087 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1088 | struct msghdr *m, size_t total_len, | |
1089 | int flags) | |
1090 | { | |
1091 | struct tun_struct *tun = container_of(sock, struct tun_struct, socket); | |
1092 | int ret; | |
1093 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) | |
1094 | return -EINVAL; | |
1095 | ret = tun_do_read(tun, iocb, m->msg_iov, total_len, | |
1096 | flags & MSG_DONTWAIT); | |
1097 | if (ret > total_len) { | |
1098 | m->msg_flags |= MSG_TRUNC; | |
1099 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1100 | } | |
1101 | return ret; | |
1102 | } | |
1103 | ||
1ab5ecb9 SK |
1104 | static int tun_release(struct socket *sock) |
1105 | { | |
1106 | if (sock->sk) | |
1107 | sock_put(sock->sk); | |
1108 | return 0; | |
1109 | } | |
1110 | ||
05c2828c MT |
1111 | /* Ops structure to mimic raw sockets with tun */ |
1112 | static const struct proto_ops tun_socket_ops = { | |
1113 | .sendmsg = tun_sendmsg, | |
1114 | .recvmsg = tun_recvmsg, | |
1ab5ecb9 | 1115 | .release = tun_release, |
05c2828c MT |
1116 | }; |
1117 | ||
33dccbb0 HX |
1118 | static struct proto tun_proto = { |
1119 | .name = "tun", | |
1120 | .owner = THIS_MODULE, | |
1121 | .obj_size = sizeof(struct tun_sock), | |
1122 | }; | |
f019a7a5 | 1123 | |
980c9e8c DW |
1124 | static int tun_flags(struct tun_struct *tun) |
1125 | { | |
1126 | int flags = 0; | |
1127 | ||
1128 | if (tun->flags & TUN_TUN_DEV) | |
1129 | flags |= IFF_TUN; | |
1130 | else | |
1131 | flags |= IFF_TAP; | |
1132 | ||
1133 | if (tun->flags & TUN_NO_PI) | |
1134 | flags |= IFF_NO_PI; | |
1135 | ||
1136 | if (tun->flags & TUN_ONE_QUEUE) | |
1137 | flags |= IFF_ONE_QUEUE; | |
1138 | ||
1139 | if (tun->flags & TUN_VNET_HDR) | |
1140 | flags |= IFF_VNET_HDR; | |
1141 | ||
1142 | return flags; | |
1143 | } | |
1144 | ||
1145 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1146 | char *buf) | |
1147 | { | |
1148 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1149 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1150 | } | |
1151 | ||
1152 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1153 | char *buf) | |
1154 | { | |
1155 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1156 | return uid_valid(tun->owner)? |
1157 | sprintf(buf, "%u\n", | |
1158 | from_kuid_munged(current_user_ns(), tun->owner)): | |
1159 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
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)); | |
0625c883 EB |
1166 | return gid_valid(tun->group) ? |
1167 | sprintf(buf, "%u\n", | |
1168 | from_kgid_munged(current_user_ns(), tun->group)): | |
1169 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1170 | } |
1171 | ||
1172 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1173 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1174 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1175 | ||
d647a591 | 1176 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 | 1177 | { |
33dccbb0 | 1178 | struct sock *sk; |
1da177e4 LT |
1179 | struct tun_struct *tun; |
1180 | struct net_device *dev; | |
1181 | int err; | |
1182 | ||
74a3e5a7 EB |
1183 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1184 | if (dev) { | |
2b980dbd PM |
1185 | const struct cred *cred = current_cred(); |
1186 | ||
f85ba780 DW |
1187 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1188 | return -EBUSY; | |
74a3e5a7 EB |
1189 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1190 | tun = netdev_priv(dev); | |
1191 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1192 | tun = netdev_priv(dev); | |
1193 | else | |
1194 | return -EINVAL; | |
1195 | ||
0625c883 EB |
1196 | if (((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || |
1197 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
2b980dbd PM |
1198 | !capable(CAP_NET_ADMIN)) |
1199 | return -EPERM; | |
d7e9660a | 1200 | err = security_tun_dev_attach(tun->socket.sk); |
2b980dbd PM |
1201 | if (err < 0) |
1202 | return err; | |
1203 | ||
a7385ba2 EB |
1204 | err = tun_attach(tun, file); |
1205 | if (err < 0) | |
1206 | return err; | |
6aa20a22 | 1207 | } |
1da177e4 LT |
1208 | else { |
1209 | char *name; | |
1210 | unsigned long flags = 0; | |
1211 | ||
ca6bb5d7 DW |
1212 | if (!capable(CAP_NET_ADMIN)) |
1213 | return -EPERM; | |
2b980dbd PM |
1214 | err = security_tun_dev_create(); |
1215 | if (err < 0) | |
1216 | return err; | |
ca6bb5d7 | 1217 | |
1da177e4 LT |
1218 | /* Set dev type */ |
1219 | if (ifr->ifr_flags & IFF_TUN) { | |
1220 | /* TUN device */ | |
1221 | flags |= TUN_TUN_DEV; | |
1222 | name = "tun%d"; | |
1223 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1224 | /* TAP device */ | |
1225 | flags |= TUN_TAP_DEV; | |
1226 | name = "tap%d"; | |
6aa20a22 | 1227 | } else |
36989b90 | 1228 | return -EINVAL; |
6aa20a22 | 1229 | |
1da177e4 LT |
1230 | if (*ifr->ifr_name) |
1231 | name = ifr->ifr_name; | |
1232 | ||
1233 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
1234 | tun_setup); | |
1235 | if (!dev) | |
1236 | return -ENOMEM; | |
1237 | ||
fc54c658 | 1238 | dev_net_set(dev, net); |
f019a7a5 | 1239 | dev->rtnl_link_ops = &tun_link_ops; |
758e43b7 | 1240 | |
1da177e4 LT |
1241 | tun = netdev_priv(dev); |
1242 | tun->dev = dev; | |
1243 | tun->flags = flags; | |
f271b2cc | 1244 | tun->txflt.count = 0; |
d9d52b51 | 1245 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
b09e786b | 1246 | set_bit(SOCK_EXTERNALLY_ALLOCATED, &tun->socket.flags); |
1da177e4 | 1247 | |
33dccbb0 | 1248 | err = -ENOMEM; |
1ab5ecb9 | 1249 | sk = sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL, &tun_proto); |
33dccbb0 HX |
1250 | if (!sk) |
1251 | goto err_free_dev; | |
1252 | ||
1ab5ecb9 | 1253 | sk_change_net(sk, net); |
43815482 ED |
1254 | tun->socket.wq = &tun->wq; |
1255 | init_waitqueue_head(&tun->wq.wait); | |
05c2828c | 1256 | tun->socket.ops = &tun_socket_ops; |
33dccbb0 HX |
1257 | sock_init_data(&tun->socket, sk); |
1258 | sk->sk_write_space = tun_sock_write_space; | |
33dccbb0 | 1259 | sk->sk_sndbuf = INT_MAX; |
0690899b | 1260 | sock_set_flag(sk, SOCK_ZEROCOPY); |
33dccbb0 | 1261 | |
80924e5f | 1262 | tun_sk(sk)->tun = tun; |
33dccbb0 | 1263 | |
2b980dbd PM |
1264 | security_tun_dev_post_create(sk); |
1265 | ||
1da177e4 LT |
1266 | tun_net_init(dev); |
1267 | ||
88255375 MM |
1268 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
1269 | TUN_USER_FEATURES; | |
1270 | dev->features = dev->hw_features; | |
1271 | ||
1da177e4 LT |
1272 | err = register_netdevice(tun->dev); |
1273 | if (err < 0) | |
9c3fea6a HX |
1274 | goto err_free_sk; |
1275 | ||
980c9e8c DW |
1276 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1277 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1278 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
6b8a66ee | 1279 | pr_err("Failed to create tun sysfs files\n"); |
980c9e8c | 1280 | |
9c3fea6a | 1281 | sk->sk_destruct = tun_sock_destruct; |
a7385ba2 EB |
1282 | |
1283 | err = tun_attach(tun, file); | |
1284 | if (err < 0) | |
9c3fea6a | 1285 | goto failed; |
1da177e4 LT |
1286 | } |
1287 | ||
6b8a66ee | 1288 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 LT |
1289 | |
1290 | if (ifr->ifr_flags & IFF_NO_PI) | |
1291 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1292 | else |
1293 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
1294 | |
1295 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
1296 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1297 | else |
1298 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1299 | |
f43798c2 RR |
1300 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1301 | tun->flags |= TUN_VNET_HDR; | |
1302 | else | |
1303 | tun->flags &= ~TUN_VNET_HDR; | |
1304 | ||
e35259a9 MK |
1305 | /* Make sure persistent devices do not get stuck in |
1306 | * xoff state. | |
1307 | */ | |
1308 | if (netif_running(tun->dev)) | |
1309 | netif_wake_queue(tun->dev); | |
1310 | ||
1da177e4 LT |
1311 | strcpy(ifr->ifr_name, tun->dev->name); |
1312 | return 0; | |
1313 | ||
33dccbb0 | 1314 | err_free_sk: |
1ab5ecb9 | 1315 | tun_free_netdev(dev); |
1da177e4 LT |
1316 | err_free_dev: |
1317 | free_netdev(dev); | |
1318 | failed: | |
1319 | return err; | |
1320 | } | |
1321 | ||
876bfd4d HX |
1322 | static int tun_get_iff(struct net *net, struct tun_struct *tun, |
1323 | struct ifreq *ifr) | |
e3b99556 | 1324 | { |
6b8a66ee | 1325 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1326 | |
1327 | strcpy(ifr->ifr_name, tun->dev->name); | |
1328 | ||
980c9e8c | 1329 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 MM |
1330 | |
1331 | return 0; | |
1332 | } | |
1333 | ||
5228ddc9 RR |
1334 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1335 | * privs required. */ | |
88255375 | 1336 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1337 | { |
c8f44aff | 1338 | netdev_features_t features = 0; |
5228ddc9 RR |
1339 | |
1340 | if (arg & TUN_F_CSUM) { | |
88255375 | 1341 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1342 | arg &= ~TUN_F_CSUM; |
1343 | ||
1344 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1345 | if (arg & TUN_F_TSO_ECN) { | |
1346 | features |= NETIF_F_TSO_ECN; | |
1347 | arg &= ~TUN_F_TSO_ECN; | |
1348 | } | |
1349 | if (arg & TUN_F_TSO4) | |
1350 | features |= NETIF_F_TSO; | |
1351 | if (arg & TUN_F_TSO6) | |
1352 | features |= NETIF_F_TSO6; | |
1353 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1354 | } | |
e36aa25a SS |
1355 | |
1356 | if (arg & TUN_F_UFO) { | |
1357 | features |= NETIF_F_UFO; | |
1358 | arg &= ~TUN_F_UFO; | |
1359 | } | |
5228ddc9 RR |
1360 | } |
1361 | ||
1362 | /* This gives the user a way to test for new features in future by | |
1363 | * trying to set them. */ | |
1364 | if (arg) | |
1365 | return -EINVAL; | |
1366 | ||
88255375 MM |
1367 | tun->set_features = features; |
1368 | netdev_update_features(tun->dev); | |
5228ddc9 RR |
1369 | |
1370 | return 0; | |
1371 | } | |
1372 | ||
50857e2a AB |
1373 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1374 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1375 | { |
36b50bab | 1376 | struct tun_file *tfile = file->private_data; |
631ab46b | 1377 | struct tun_struct *tun; |
1da177e4 | 1378 | void __user* argp = (void __user*)arg; |
99405162 | 1379 | struct sock_fprog fprog; |
1da177e4 | 1380 | struct ifreq ifr; |
0625c883 EB |
1381 | kuid_t owner; |
1382 | kgid_t group; | |
33dccbb0 | 1383 | int sndbuf; |
d9d52b51 | 1384 | int vnet_hdr_sz; |
f271b2cc | 1385 | int ret; |
1da177e4 | 1386 | |
a117dacd | 1387 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) { |
50857e2a | 1388 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 1389 | return -EFAULT; |
8bbb1813 | 1390 | } else { |
a117dacd | 1391 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 1392 | } |
631ab46b EB |
1393 | if (cmd == TUNGETFEATURES) { |
1394 | /* Currently this just means: "what IFF flags are valid?". | |
1395 | * This is needed because we never checked for invalid flags on | |
1396 | * TUNSETIFF. */ | |
1397 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
1398 | IFF_VNET_HDR, | |
1399 | (unsigned int __user*)argp); | |
1400 | } | |
1401 | ||
876bfd4d HX |
1402 | rtnl_lock(); |
1403 | ||
36b50bab | 1404 | tun = __tun_get(tfile); |
1da177e4 | 1405 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1406 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1407 | ||
876bfd4d | 1408 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1409 | |
876bfd4d HX |
1410 | if (ret) |
1411 | goto unlock; | |
1da177e4 | 1412 | |
50857e2a | 1413 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1414 | ret = -EFAULT; |
1415 | goto unlock; | |
1da177e4 LT |
1416 | } |
1417 | ||
876bfd4d | 1418 | ret = -EBADFD; |
1da177e4 | 1419 | if (!tun) |
876bfd4d | 1420 | goto unlock; |
1da177e4 | 1421 | |
6b8a66ee | 1422 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %d\n", cmd); |
1da177e4 | 1423 | |
631ab46b | 1424 | ret = 0; |
1da177e4 | 1425 | switch (cmd) { |
e3b99556 | 1426 | case TUNGETIFF: |
876bfd4d | 1427 | ret = tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1428 | if (ret) |
631ab46b | 1429 | break; |
e3b99556 | 1430 | |
50857e2a | 1431 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1432 | ret = -EFAULT; |
e3b99556 MM |
1433 | break; |
1434 | ||
1da177e4 LT |
1435 | case TUNSETNOCSUM: |
1436 | /* Disable/Enable checksum */ | |
1da177e4 | 1437 | |
88255375 MM |
1438 | /* [unimplemented] */ |
1439 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 1440 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
1441 | break; |
1442 | ||
1443 | case TUNSETPERSIST: | |
1444 | /* Disable/Enable persist mode */ | |
1445 | if (arg) | |
1446 | tun->flags |= TUN_PERSIST; | |
1447 | else | |
1448 | tun->flags &= ~TUN_PERSIST; | |
1449 | ||
6b8a66ee JP |
1450 | tun_debug(KERN_INFO, tun, "persist %s\n", |
1451 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
1452 | break; |
1453 | ||
1454 | case TUNSETOWNER: | |
1455 | /* Set owner of the device */ | |
0625c883 EB |
1456 | owner = make_kuid(current_user_ns(), arg); |
1457 | if (!uid_valid(owner)) { | |
1458 | ret = -EINVAL; | |
1459 | break; | |
1460 | } | |
1461 | tun->owner = owner; | |
1462 | tun_debug(KERN_INFO, tun, "owner set to %d\n", | |
1463 | from_kuid(&init_user_ns, tun->owner)); | |
1da177e4 LT |
1464 | break; |
1465 | ||
8c644623 GG |
1466 | case TUNSETGROUP: |
1467 | /* Set group of the device */ | |
0625c883 EB |
1468 | group = make_kgid(current_user_ns(), arg); |
1469 | if (!gid_valid(group)) { | |
1470 | ret = -EINVAL; | |
1471 | break; | |
1472 | } | |
1473 | tun->group = group; | |
1474 | tun_debug(KERN_INFO, tun, "group set to %d\n", | |
1475 | from_kgid(&init_user_ns, tun->group)); | |
8c644623 GG |
1476 | break; |
1477 | ||
ff4cc3ac MK |
1478 | case TUNSETLINK: |
1479 | /* Only allow setting the type when the interface is down */ | |
1480 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
1481 | tun_debug(KERN_INFO, tun, |
1482 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 1483 | ret = -EBUSY; |
ff4cc3ac MK |
1484 | } else { |
1485 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
1486 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
1487 | tun->dev->type); | |
48abfe05 | 1488 | ret = 0; |
ff4cc3ac | 1489 | } |
631ab46b | 1490 | break; |
ff4cc3ac | 1491 | |
1da177e4 LT |
1492 | #ifdef TUN_DEBUG |
1493 | case TUNSETDEBUG: | |
1494 | tun->debug = arg; | |
1495 | break; | |
1496 | #endif | |
5228ddc9 | 1497 | case TUNSETOFFLOAD: |
88255375 | 1498 | ret = set_offload(tun, arg); |
631ab46b | 1499 | break; |
5228ddc9 | 1500 | |
f271b2cc MK |
1501 | case TUNSETTXFILTER: |
1502 | /* Can be set only for TAPs */ | |
631ab46b | 1503 | ret = -EINVAL; |
f271b2cc | 1504 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 1505 | break; |
c0e5a8c2 | 1506 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 1507 | break; |
1da177e4 LT |
1508 | |
1509 | case SIOCGIFHWADDR: | |
b595076a | 1510 | /* Get hw address */ |
f271b2cc MK |
1511 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
1512 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 1513 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
1514 | ret = -EFAULT; |
1515 | break; | |
1da177e4 LT |
1516 | |
1517 | case SIOCSIFHWADDR: | |
f271b2cc | 1518 | /* Set hw address */ |
6b8a66ee JP |
1519 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
1520 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 1521 | |
40102371 | 1522 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 1523 | break; |
33dccbb0 HX |
1524 | |
1525 | case TUNGETSNDBUF: | |
89f56d1e | 1526 | sndbuf = tun->socket.sk->sk_sndbuf; |
33dccbb0 HX |
1527 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
1528 | ret = -EFAULT; | |
1529 | break; | |
1530 | ||
1531 | case TUNSETSNDBUF: | |
1532 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
1533 | ret = -EFAULT; | |
1534 | break; | |
1535 | } | |
1536 | ||
89f56d1e | 1537 | tun->socket.sk->sk_sndbuf = sndbuf; |
33dccbb0 HX |
1538 | break; |
1539 | ||
d9d52b51 MT |
1540 | case TUNGETVNETHDRSZ: |
1541 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
1542 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
1543 | ret = -EFAULT; | |
1544 | break; | |
1545 | ||
1546 | case TUNSETVNETHDRSZ: | |
1547 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
1548 | ret = -EFAULT; | |
1549 | break; | |
1550 | } | |
1551 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
1552 | ret = -EINVAL; | |
1553 | break; | |
1554 | } | |
1555 | ||
1556 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
1557 | break; | |
1558 | ||
99405162 MT |
1559 | case TUNATTACHFILTER: |
1560 | /* Can be set only for TAPs */ | |
1561 | ret = -EINVAL; | |
1562 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1563 | break; | |
1564 | ret = -EFAULT; | |
1565 | if (copy_from_user(&fprog, argp, sizeof(fprog))) | |
1566 | break; | |
1567 | ||
1568 | ret = sk_attach_filter(&fprog, tun->socket.sk); | |
1569 | break; | |
1570 | ||
1571 | case TUNDETACHFILTER: | |
1572 | /* Can be set only for TAPs */ | |
1573 | ret = -EINVAL; | |
1574 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1575 | break; | |
1576 | ret = sk_detach_filter(tun->socket.sk); | |
1577 | break; | |
1578 | ||
1da177e4 | 1579 | default: |
631ab46b EB |
1580 | ret = -EINVAL; |
1581 | break; | |
ee289b64 | 1582 | } |
1da177e4 | 1583 | |
876bfd4d HX |
1584 | unlock: |
1585 | rtnl_unlock(); | |
1586 | if (tun) | |
1587 | tun_put(tun); | |
631ab46b | 1588 | return ret; |
1da177e4 LT |
1589 | } |
1590 | ||
50857e2a AB |
1591 | static long tun_chr_ioctl(struct file *file, |
1592 | unsigned int cmd, unsigned long arg) | |
1593 | { | |
1594 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
1595 | } | |
1596 | ||
1597 | #ifdef CONFIG_COMPAT | |
1598 | static long tun_chr_compat_ioctl(struct file *file, | |
1599 | unsigned int cmd, unsigned long arg) | |
1600 | { | |
1601 | switch (cmd) { | |
1602 | case TUNSETIFF: | |
1603 | case TUNGETIFF: | |
1604 | case TUNSETTXFILTER: | |
1605 | case TUNGETSNDBUF: | |
1606 | case TUNSETSNDBUF: | |
1607 | case SIOCGIFHWADDR: | |
1608 | case SIOCSIFHWADDR: | |
1609 | arg = (unsigned long)compat_ptr(arg); | |
1610 | break; | |
1611 | default: | |
1612 | arg = (compat_ulong_t)arg; | |
1613 | break; | |
1614 | } | |
1615 | ||
1616 | /* | |
1617 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
1618 | * the end of that structure. All fields that are used in this | |
1619 | * driver are compatible though, we don't need to convert the | |
1620 | * contents. | |
1621 | */ | |
1622 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
1623 | } | |
1624 | #endif /* CONFIG_COMPAT */ | |
1625 | ||
1da177e4 LT |
1626 | static int tun_chr_fasync(int fd, struct file *file, int on) |
1627 | { | |
631ab46b | 1628 | struct tun_struct *tun = tun_get(file); |
1da177e4 LT |
1629 | int ret; |
1630 | ||
1631 | if (!tun) | |
1632 | return -EBADFD; | |
1633 | ||
6b8a66ee | 1634 | tun_debug(KERN_INFO, tun, "tun_chr_fasync %d\n", on); |
1da177e4 LT |
1635 | |
1636 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) | |
9d319522 | 1637 | goto out; |
6aa20a22 | 1638 | |
1da177e4 | 1639 | if (on) { |
609d7fa9 | 1640 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 1641 | if (ret) |
9d319522 | 1642 | goto out; |
1da177e4 | 1643 | tun->flags |= TUN_FASYNC; |
6aa20a22 | 1644 | } else |
1da177e4 | 1645 | tun->flags &= ~TUN_FASYNC; |
9d319522 JC |
1646 | ret = 0; |
1647 | out: | |
631ab46b | 1648 | tun_put(tun); |
9d319522 | 1649 | return ret; |
1da177e4 LT |
1650 | } |
1651 | ||
1652 | static int tun_chr_open(struct inode *inode, struct file * file) | |
1653 | { | |
631ab46b | 1654 | struct tun_file *tfile; |
deed49fb | 1655 | |
6b8a66ee | 1656 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b EB |
1657 | |
1658 | tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); | |
1659 | if (!tfile) | |
1660 | return -ENOMEM; | |
c70f1829 | 1661 | atomic_set(&tfile->count, 0); |
631ab46b | 1662 | tfile->tun = NULL; |
36b50bab | 1663 | tfile->net = get_net(current->nsproxy->net_ns); |
631ab46b | 1664 | file->private_data = tfile; |
1da177e4 LT |
1665 | return 0; |
1666 | } | |
1667 | ||
1668 | static int tun_chr_close(struct inode *inode, struct file *file) | |
1669 | { | |
631ab46b | 1670 | struct tun_file *tfile = file->private_data; |
f0a4d0e5 | 1671 | struct tun_struct *tun; |
1da177e4 | 1672 | |
f0a4d0e5 | 1673 | tun = __tun_get(tfile); |
631ab46b | 1674 | if (tun) { |
d23e4365 HX |
1675 | struct net_device *dev = tun->dev; |
1676 | ||
6b8a66ee | 1677 | tun_debug(KERN_INFO, tun, "tun_chr_close\n"); |
1da177e4 | 1678 | |
631ab46b | 1679 | __tun_detach(tun); |
1da177e4 | 1680 | |
3ad2f3fb | 1681 | /* If desirable, unregister the netdevice. */ |
d23e4365 HX |
1682 | if (!(tun->flags & TUN_PERSIST)) { |
1683 | rtnl_lock(); | |
1684 | if (dev->reg_state == NETREG_REGISTERED) | |
1685 | unregister_netdevice(dev); | |
1686 | rtnl_unlock(); | |
1687 | } | |
631ab46b | 1688 | } |
1da177e4 | 1689 | |
9c3fea6a HX |
1690 | tun = tfile->tun; |
1691 | if (tun) | |
89f56d1e | 1692 | sock_put(tun->socket.sk); |
9c3fea6a | 1693 | |
36b50bab | 1694 | put_net(tfile->net); |
631ab46b | 1695 | kfree(tfile); |
1da177e4 LT |
1696 | |
1697 | return 0; | |
1698 | } | |
1699 | ||
d54b1fdb | 1700 | static const struct file_operations tun_fops = { |
6aa20a22 | 1701 | .owner = THIS_MODULE, |
1da177e4 | 1702 | .llseek = no_llseek, |
ee0b3e67 BP |
1703 | .read = do_sync_read, |
1704 | .aio_read = tun_chr_aio_read, | |
1705 | .write = do_sync_write, | |
1706 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 1707 | .poll = tun_chr_poll, |
50857e2a AB |
1708 | .unlocked_ioctl = tun_chr_ioctl, |
1709 | #ifdef CONFIG_COMPAT | |
1710 | .compat_ioctl = tun_chr_compat_ioctl, | |
1711 | #endif | |
1da177e4 LT |
1712 | .open = tun_chr_open, |
1713 | .release = tun_chr_close, | |
6aa20a22 | 1714 | .fasync = tun_chr_fasync |
1da177e4 LT |
1715 | }; |
1716 | ||
1717 | static struct miscdevice tun_miscdev = { | |
1718 | .minor = TUN_MINOR, | |
1719 | .name = "tun", | |
e454cea2 | 1720 | .nodename = "net/tun", |
1da177e4 | 1721 | .fops = &tun_fops, |
1da177e4 LT |
1722 | }; |
1723 | ||
1724 | /* ethtool interface */ | |
1725 | ||
1726 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1727 | { | |
1728 | cmd->supported = 0; | |
1729 | cmd->advertising = 0; | |
70739497 | 1730 | ethtool_cmd_speed_set(cmd, SPEED_10); |
1da177e4 LT |
1731 | cmd->duplex = DUPLEX_FULL; |
1732 | cmd->port = PORT_TP; | |
1733 | cmd->phy_address = 0; | |
1734 | cmd->transceiver = XCVR_INTERNAL; | |
1735 | cmd->autoneg = AUTONEG_DISABLE; | |
1736 | cmd->maxtxpkt = 0; | |
1737 | cmd->maxrxpkt = 0; | |
1738 | return 0; | |
1739 | } | |
1740 | ||
1741 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
1742 | { | |
1743 | struct tun_struct *tun = netdev_priv(dev); | |
1744 | ||
33a5ba14 RJ |
1745 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
1746 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
1747 | |
1748 | switch (tun->flags & TUN_TYPE_MASK) { | |
1749 | case TUN_TUN_DEV: | |
33a5ba14 | 1750 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 LT |
1751 | break; |
1752 | case TUN_TAP_DEV: | |
33a5ba14 | 1753 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
1754 | break; |
1755 | } | |
1756 | } | |
1757 | ||
1758 | static u32 tun_get_msglevel(struct net_device *dev) | |
1759 | { | |
1760 | #ifdef TUN_DEBUG | |
1761 | struct tun_struct *tun = netdev_priv(dev); | |
1762 | return tun->debug; | |
1763 | #else | |
1764 | return -EOPNOTSUPP; | |
1765 | #endif | |
1766 | } | |
1767 | ||
1768 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
1769 | { | |
1770 | #ifdef TUN_DEBUG | |
1771 | struct tun_struct *tun = netdev_priv(dev); | |
1772 | tun->debug = value; | |
1773 | #endif | |
1774 | } | |
1775 | ||
7282d491 | 1776 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
1777 | .get_settings = tun_get_settings, |
1778 | .get_drvinfo = tun_get_drvinfo, | |
1779 | .get_msglevel = tun_get_msglevel, | |
1780 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 1781 | .get_link = ethtool_op_get_link, |
1da177e4 LT |
1782 | }; |
1783 | ||
79d17604 | 1784 | |
1da177e4 LT |
1785 | static int __init tun_init(void) |
1786 | { | |
1787 | int ret = 0; | |
1788 | ||
6b8a66ee JP |
1789 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
1790 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 1791 | |
f019a7a5 | 1792 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 1793 | if (ret) { |
6b8a66ee | 1794 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 1795 | goto err_linkops; |
79d17604 PE |
1796 | } |
1797 | ||
1da177e4 | 1798 | ret = misc_register(&tun_miscdev); |
79d17604 | 1799 | if (ret) { |
6b8a66ee | 1800 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
1801 | goto err_misc; |
1802 | } | |
f019a7a5 | 1803 | return 0; |
79d17604 | 1804 | err_misc: |
f019a7a5 EB |
1805 | rtnl_link_unregister(&tun_link_ops); |
1806 | err_linkops: | |
1da177e4 LT |
1807 | return ret; |
1808 | } | |
1809 | ||
1810 | static void tun_cleanup(void) | |
1811 | { | |
6aa20a22 | 1812 | misc_deregister(&tun_miscdev); |
f019a7a5 | 1813 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
1814 | } |
1815 | ||
05c2828c MT |
1816 | /* Get an underlying socket object from tun file. Returns error unless file is |
1817 | * attached to a device. The returned object works like a packet socket, it | |
1818 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
1819 | * holding a reference to the file for as long as the socket is in use. */ | |
1820 | struct socket *tun_get_socket(struct file *file) | |
1821 | { | |
1822 | struct tun_struct *tun; | |
1823 | if (file->f_op != &tun_fops) | |
1824 | return ERR_PTR(-EINVAL); | |
1825 | tun = tun_get(file); | |
1826 | if (!tun) | |
1827 | return ERR_PTR(-EBADFD); | |
1828 | tun_put(tun); | |
1829 | return &tun->socket; | |
1830 | } | |
1831 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
1832 | ||
1da177e4 LT |
1833 | module_init(tun_init); |
1834 | module_exit(tun_cleanup); | |
1835 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1836 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1837 | MODULE_LICENSE("GPL"); | |
1838 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 1839 | MODULE_ALIAS("devname:net/tun"); |