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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> |
f271b2cc | 25 | * Use random_ether_addr() for tap MAC address. |
1da177e4 LT |
26 | * |
27 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 | |
28 | * Fixes in packet dropping, queue length setting and queue wakeup. | |
29 | * Increased default tx queue length. | |
30 | * Added ethtool API. | |
31 | * Minor cleanups | |
32 | * | |
33 | * Daniel Podlejski <underley@underley.eu.org> | |
34 | * Modifications for 2.3.99-pre5 kernel. | |
35 | */ | |
36 | ||
37 | #define DRV_NAME "tun" | |
38 | #define DRV_VERSION "1.6" | |
39 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
40 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
41 | ||
1da177e4 LT |
42 | #include <linux/module.h> |
43 | #include <linux/errno.h> | |
44 | #include <linux/kernel.h> | |
45 | #include <linux/major.h> | |
46 | #include <linux/slab.h> | |
fd3e05b6 | 47 | #include <linux/smp_lock.h> |
1da177e4 LT |
48 | #include <linux/poll.h> |
49 | #include <linux/fcntl.h> | |
50 | #include <linux/init.h> | |
51 | #include <linux/skbuff.h> | |
52 | #include <linux/netdevice.h> | |
53 | #include <linux/etherdevice.h> | |
54 | #include <linux/miscdevice.h> | |
55 | #include <linux/ethtool.h> | |
56 | #include <linux/rtnetlink.h> | |
57 | #include <linux/if.h> | |
58 | #include <linux/if_arp.h> | |
59 | #include <linux/if_ether.h> | |
60 | #include <linux/if_tun.h> | |
61 | #include <linux/crc32.h> | |
d647a591 | 62 | #include <linux/nsproxy.h> |
f43798c2 | 63 | #include <linux/virtio_net.h> |
881d966b | 64 | #include <net/net_namespace.h> |
79d17604 | 65 | #include <net/netns/generic.h> |
f019a7a5 | 66 | #include <net/rtnetlink.h> |
1da177e4 LT |
67 | |
68 | #include <asm/system.h> | |
69 | #include <asm/uaccess.h> | |
70 | ||
14daa021 RR |
71 | /* Uncomment to enable debugging */ |
72 | /* #define TUN_DEBUG 1 */ | |
73 | ||
1da177e4 LT |
74 | #ifdef TUN_DEBUG |
75 | static int debug; | |
14daa021 RR |
76 | |
77 | #define DBG if(tun->debug)printk | |
78 | #define DBG1 if(debug==2)printk | |
79 | #else | |
80 | #define DBG( a... ) | |
81 | #define DBG1( a... ) | |
82 | #endif | |
83 | ||
f271b2cc MK |
84 | #define FLT_EXACT_COUNT 8 |
85 | struct tap_filter { | |
86 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
87 | u32 mask[2]; /* Mask of the hashed addrs */ | |
88 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
89 | }; | |
90 | ||
631ab46b | 91 | struct tun_file { |
c70f1829 | 92 | atomic_t count; |
631ab46b | 93 | struct tun_struct *tun; |
36b50bab | 94 | struct net *net; |
b2430de3 | 95 | wait_queue_head_t read_wait; |
631ab46b EB |
96 | }; |
97 | ||
14daa021 | 98 | struct tun_struct { |
631ab46b | 99 | struct tun_file *tfile; |
f271b2cc | 100 | unsigned int flags; |
14daa021 RR |
101 | uid_t owner; |
102 | gid_t group; | |
103 | ||
14daa021 RR |
104 | struct sk_buff_head readq; |
105 | ||
106 | struct net_device *dev; | |
f271b2cc | 107 | struct fasync_struct *fasync; |
14daa021 | 108 | |
f271b2cc | 109 | struct tap_filter txflt; |
14daa021 RR |
110 | |
111 | #ifdef TUN_DEBUG | |
112 | int debug; | |
1da177e4 | 113 | #endif |
14daa021 | 114 | }; |
1da177e4 | 115 | |
a7385ba2 EB |
116 | static int tun_attach(struct tun_struct *tun, struct file *file) |
117 | { | |
631ab46b | 118 | struct tun_file *tfile = file->private_data; |
a7385ba2 | 119 | const struct cred *cred = current_cred(); |
38231b7a | 120 | int err; |
a7385ba2 EB |
121 | |
122 | ASSERT_RTNL(); | |
123 | ||
a7385ba2 EB |
124 | /* Check permissions */ |
125 | if (((tun->owner != -1 && cred->euid != tun->owner) || | |
126 | (tun->group != -1 && cred->egid != tun->group)) && | |
127 | !capable(CAP_NET_ADMIN)) | |
128 | return -EPERM; | |
129 | ||
38231b7a EB |
130 | netif_tx_lock_bh(tun->dev); |
131 | ||
132 | err = -EINVAL; | |
133 | if (tfile->tun) | |
134 | goto out; | |
135 | ||
136 | err = -EBUSY; | |
137 | if (tun->tfile) | |
138 | goto out; | |
139 | ||
140 | err = 0; | |
631ab46b EB |
141 | tfile->tun = tun; |
142 | tun->tfile = tfile; | |
c70f1829 EB |
143 | dev_hold(tun->dev); |
144 | atomic_inc(&tfile->count); | |
a7385ba2 | 145 | |
38231b7a EB |
146 | out: |
147 | netif_tx_unlock_bh(tun->dev); | |
148 | return err; | |
a7385ba2 EB |
149 | } |
150 | ||
631ab46b EB |
151 | static void __tun_detach(struct tun_struct *tun) |
152 | { | |
153 | struct tun_file *tfile = tun->tfile; | |
154 | ||
155 | /* Detach from net device */ | |
38231b7a | 156 | netif_tx_lock_bh(tun->dev); |
631ab46b EB |
157 | tfile->tun = NULL; |
158 | tun->tfile = NULL; | |
38231b7a | 159 | netif_tx_unlock_bh(tun->dev); |
631ab46b EB |
160 | |
161 | /* Drop read queue */ | |
162 | skb_queue_purge(&tun->readq); | |
c70f1829 EB |
163 | |
164 | /* Drop the extra count on the net device */ | |
165 | dev_put(tun->dev); | |
166 | } | |
167 | ||
168 | static void tun_detach(struct tun_struct *tun) | |
169 | { | |
170 | rtnl_lock(); | |
171 | __tun_detach(tun); | |
172 | rtnl_unlock(); | |
631ab46b EB |
173 | } |
174 | ||
175 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
176 | { | |
c70f1829 EB |
177 | struct tun_struct *tun = NULL; |
178 | ||
179 | if (atomic_inc_not_zero(&tfile->count)) | |
180 | tun = tfile->tun; | |
181 | ||
182 | return tun; | |
631ab46b EB |
183 | } |
184 | ||
185 | static struct tun_struct *tun_get(struct file *file) | |
186 | { | |
187 | return __tun_get(file->private_data); | |
188 | } | |
189 | ||
190 | static void tun_put(struct tun_struct *tun) | |
191 | { | |
c70f1829 EB |
192 | struct tun_file *tfile = tun->tfile; |
193 | ||
194 | if (atomic_dec_and_test(&tfile->count)) | |
195 | tun_detach(tfile->tun); | |
631ab46b EB |
196 | } |
197 | ||
f271b2cc MK |
198 | /* TAP filterting */ |
199 | static void addr_hash_set(u32 *mask, const u8 *addr) | |
200 | { | |
201 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
202 | mask[n >> 5] |= (1 << (n & 31)); | |
203 | } | |
204 | ||
205 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
206 | { | |
207 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
208 | return mask[n >> 5] & (1 << (n & 31)); | |
209 | } | |
210 | ||
211 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
212 | { | |
213 | struct { u8 u[ETH_ALEN]; } *addr; | |
214 | struct tun_filter uf; | |
215 | int err, alen, n, nexact; | |
216 | ||
217 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
218 | return -EFAULT; | |
219 | ||
220 | if (!uf.count) { | |
221 | /* Disabled */ | |
222 | filter->count = 0; | |
223 | return 0; | |
224 | } | |
225 | ||
226 | alen = ETH_ALEN * uf.count; | |
227 | addr = kmalloc(alen, GFP_KERNEL); | |
228 | if (!addr) | |
229 | return -ENOMEM; | |
230 | ||
231 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
232 | err = -EFAULT; | |
233 | goto done; | |
234 | } | |
235 | ||
236 | /* The filter is updated without holding any locks. Which is | |
237 | * perfectly safe. We disable it first and in the worst | |
238 | * case we'll accept a few undesired packets. */ | |
239 | filter->count = 0; | |
240 | wmb(); | |
241 | ||
242 | /* Use first set of addresses as an exact filter */ | |
243 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
244 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
245 | ||
246 | nexact = n; | |
247 | ||
248 | /* The rest is hashed */ | |
249 | memset(filter->mask, 0, sizeof(filter->mask)); | |
250 | for (; n < uf.count; n++) | |
251 | addr_hash_set(filter->mask, addr[n].u); | |
252 | ||
253 | /* For ALLMULTI just set the mask to all ones. | |
254 | * This overrides the mask populated above. */ | |
255 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
256 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
257 | ||
258 | /* Now enable the filter */ | |
259 | wmb(); | |
260 | filter->count = nexact; | |
261 | ||
262 | /* Return the number of exact filters */ | |
263 | err = nexact; | |
264 | ||
265 | done: | |
266 | kfree(addr); | |
267 | return err; | |
268 | } | |
269 | ||
270 | /* Returns: 0 - drop, !=0 - accept */ | |
271 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
272 | { | |
273 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
274 | * at this point. */ | |
275 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
276 | int i; | |
277 | ||
278 | /* Exact match */ | |
279 | for (i = 0; i < filter->count; i++) | |
280 | if (!compare_ether_addr(eh->h_dest, filter->addr[i])) | |
281 | return 1; | |
282 | ||
283 | /* Inexact match (multicast only) */ | |
284 | if (is_multicast_ether_addr(eh->h_dest)) | |
285 | return addr_hash_test(filter->mask, eh->h_dest); | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | /* | |
291 | * Checks whether the packet is accepted or not. | |
292 | * Returns: 0 - drop, !=0 - accept | |
293 | */ | |
294 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
295 | { | |
296 | if (!filter->count) | |
297 | return 1; | |
298 | ||
299 | return run_filter(filter, skb); | |
300 | } | |
301 | ||
1da177e4 LT |
302 | /* Network device part of the driver */ |
303 | ||
7282d491 | 304 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 305 | |
c70f1829 EB |
306 | /* Net device detach from fd. */ |
307 | static void tun_net_uninit(struct net_device *dev) | |
308 | { | |
309 | struct tun_struct *tun = netdev_priv(dev); | |
310 | struct tun_file *tfile = tun->tfile; | |
311 | ||
312 | /* Inform the methods they need to stop using the dev. | |
313 | */ | |
314 | if (tfile) { | |
315 | wake_up_all(&tfile->read_wait); | |
316 | if (atomic_dec_and_test(&tfile->count)) | |
317 | __tun_detach(tun); | |
318 | } | |
319 | } | |
320 | ||
1da177e4 LT |
321 | /* Net device open. */ |
322 | static int tun_net_open(struct net_device *dev) | |
323 | { | |
324 | netif_start_queue(dev); | |
325 | return 0; | |
326 | } | |
327 | ||
328 | /* Net device close. */ | |
329 | static int tun_net_close(struct net_device *dev) | |
330 | { | |
331 | netif_stop_queue(dev); | |
332 | return 0; | |
333 | } | |
334 | ||
335 | /* Net device start xmit */ | |
336 | static int tun_net_xmit(struct sk_buff *skb, struct net_device *dev) | |
337 | { | |
338 | struct tun_struct *tun = netdev_priv(dev); | |
339 | ||
340 | DBG(KERN_INFO "%s: tun_net_xmit %d\n", tun->dev->name, skb->len); | |
341 | ||
342 | /* Drop packet if interface is not attached */ | |
631ab46b | 343 | if (!tun->tfile) |
1da177e4 LT |
344 | goto drop; |
345 | ||
f271b2cc MK |
346 | /* Drop if the filter does not like it. |
347 | * This is a noop if the filter is disabled. | |
348 | * Filter can be enabled only for the TAP devices. */ | |
349 | if (!check_filter(&tun->txflt, skb)) | |
350 | goto drop; | |
351 | ||
1da177e4 LT |
352 | if (skb_queue_len(&tun->readq) >= dev->tx_queue_len) { |
353 | if (!(tun->flags & TUN_ONE_QUEUE)) { | |
354 | /* Normal queueing mode. */ | |
355 | /* Packet scheduler handles dropping of further packets. */ | |
356 | netif_stop_queue(dev); | |
357 | ||
358 | /* We won't see all dropped packets individually, so overrun | |
359 | * error is more appropriate. */ | |
09f75cd7 | 360 | dev->stats.tx_fifo_errors++; |
1da177e4 LT |
361 | } else { |
362 | /* Single queue mode. | |
363 | * Driver handles dropping of all packets itself. */ | |
364 | goto drop; | |
365 | } | |
366 | } | |
367 | ||
f271b2cc | 368 | /* Enqueue packet */ |
1da177e4 LT |
369 | skb_queue_tail(&tun->readq, skb); |
370 | dev->trans_start = jiffies; | |
371 | ||
372 | /* Notify and wake up reader process */ | |
373 | if (tun->flags & TUN_FASYNC) | |
374 | kill_fasync(&tun->fasync, SIGIO, POLL_IN); | |
b2430de3 | 375 | wake_up_interruptible(&tun->tfile->read_wait); |
1da177e4 LT |
376 | return 0; |
377 | ||
378 | drop: | |
09f75cd7 | 379 | dev->stats.tx_dropped++; |
1da177e4 LT |
380 | kfree_skb(skb); |
381 | return 0; | |
382 | } | |
383 | ||
f271b2cc | 384 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 385 | { |
f271b2cc MK |
386 | /* |
387 | * This callback is supposed to deal with mc filter in | |
388 | * _rx_ path and has nothing to do with the _tx_ path. | |
389 | * In rx path we always accept everything userspace gives us. | |
390 | */ | |
391 | return; | |
1da177e4 LT |
392 | } |
393 | ||
4885a504 ES |
394 | #define MIN_MTU 68 |
395 | #define MAX_MTU 65535 | |
396 | ||
397 | static int | |
398 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
399 | { | |
400 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
401 | return -EINVAL; | |
402 | dev->mtu = new_mtu; | |
403 | return 0; | |
404 | } | |
405 | ||
758e43b7 | 406 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 407 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
408 | .ndo_open = tun_net_open, |
409 | .ndo_stop = tun_net_close, | |
00829823 | 410 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 411 | .ndo_change_mtu = tun_net_change_mtu, |
758e43b7 SH |
412 | }; |
413 | ||
414 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 415 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
416 | .ndo_open = tun_net_open, |
417 | .ndo_stop = tun_net_close, | |
00829823 | 418 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 SH |
419 | .ndo_change_mtu = tun_net_change_mtu, |
420 | .ndo_set_multicast_list = tun_net_mclist, | |
421 | .ndo_set_mac_address = eth_mac_addr, | |
422 | .ndo_validate_addr = eth_validate_addr, | |
423 | }; | |
424 | ||
1da177e4 LT |
425 | /* Initialize net device. */ |
426 | static void tun_net_init(struct net_device *dev) | |
427 | { | |
428 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 429 | |
1da177e4 LT |
430 | switch (tun->flags & TUN_TYPE_MASK) { |
431 | case TUN_TUN_DEV: | |
758e43b7 SH |
432 | dev->netdev_ops = &tun_netdev_ops; |
433 | ||
1da177e4 LT |
434 | /* Point-to-Point TUN Device */ |
435 | dev->hard_header_len = 0; | |
436 | dev->addr_len = 0; | |
437 | dev->mtu = 1500; | |
438 | ||
439 | /* Zero header length */ | |
6aa20a22 | 440 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
441 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
442 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
443 | break; | |
444 | ||
445 | case TUN_TAP_DEV: | |
7a0a9608 | 446 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 447 | /* Ethernet TAP Device */ |
1da177e4 | 448 | ether_setup(dev); |
36226a8d | 449 | |
f271b2cc | 450 | random_ether_addr(dev->dev_addr); |
36226a8d | 451 | |
1da177e4 LT |
452 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
453 | break; | |
454 | } | |
455 | } | |
456 | ||
457 | /* Character device part */ | |
458 | ||
459 | /* Poll */ | |
460 | static unsigned int tun_chr_poll(struct file *file, poll_table * wait) | |
6aa20a22 | 461 | { |
b2430de3 EB |
462 | struct tun_file *tfile = file->private_data; |
463 | struct tun_struct *tun = __tun_get(tfile); | |
1da177e4 LT |
464 | unsigned int mask = POLLOUT | POLLWRNORM; |
465 | ||
466 | if (!tun) | |
eac9e902 | 467 | return POLLERR; |
1da177e4 LT |
468 | |
469 | DBG(KERN_INFO "%s: tun_chr_poll\n", tun->dev->name); | |
470 | ||
b2430de3 | 471 | poll_wait(file, &tfile->read_wait, wait); |
6aa20a22 | 472 | |
b03efcfb | 473 | if (!skb_queue_empty(&tun->readq)) |
1da177e4 LT |
474 | mask |= POLLIN | POLLRDNORM; |
475 | ||
c70f1829 EB |
476 | if (tun->dev->reg_state != NETREG_REGISTERED) |
477 | mask = POLLERR; | |
478 | ||
631ab46b | 479 | tun_put(tun); |
1da177e4 LT |
480 | return mask; |
481 | } | |
482 | ||
f42157cb RR |
483 | /* prepad is the amount to reserve at front. len is length after that. |
484 | * linear is a hint as to how much to copy (usually headers). */ | |
485 | static struct sk_buff *tun_alloc_skb(size_t prepad, size_t len, size_t linear, | |
486 | gfp_t gfp) | |
487 | { | |
488 | struct sk_buff *skb; | |
489 | unsigned int i; | |
490 | ||
491 | skb = alloc_skb(prepad + len, gfp|__GFP_NOWARN); | |
492 | if (skb) { | |
493 | skb_reserve(skb, prepad); | |
494 | skb_put(skb, len); | |
495 | return skb; | |
496 | } | |
497 | ||
498 | /* Under a page? Don't bother with paged skb. */ | |
499 | if (prepad + len < PAGE_SIZE) | |
500 | return NULL; | |
501 | ||
502 | /* Start with a normal skb, and add pages. */ | |
503 | skb = alloc_skb(prepad + linear, gfp); | |
504 | if (!skb) | |
505 | return NULL; | |
506 | ||
507 | skb_reserve(skb, prepad); | |
508 | skb_put(skb, linear); | |
509 | ||
510 | len -= linear; | |
511 | ||
512 | for (i = 0; i < MAX_SKB_FRAGS; i++) { | |
513 | skb_frag_t *f = &skb_shinfo(skb)->frags[i]; | |
514 | ||
515 | f->page = alloc_page(gfp|__GFP_ZERO); | |
516 | if (!f->page) | |
517 | break; | |
518 | ||
519 | f->page_offset = 0; | |
520 | f->size = PAGE_SIZE; | |
521 | ||
522 | skb->data_len += PAGE_SIZE; | |
523 | skb->len += PAGE_SIZE; | |
524 | skb->truesize += PAGE_SIZE; | |
525 | skb_shinfo(skb)->nr_frags++; | |
526 | ||
527 | if (len < PAGE_SIZE) { | |
528 | len = 0; | |
529 | break; | |
530 | } | |
531 | len -= PAGE_SIZE; | |
532 | } | |
533 | ||
534 | /* Too large, or alloc fail? */ | |
535 | if (unlikely(len)) { | |
536 | kfree_skb(skb); | |
537 | skb = NULL; | |
538 | } | |
539 | ||
540 | return skb; | |
541 | } | |
542 | ||
1da177e4 LT |
543 | /* Get packet from user space buffer */ |
544 | static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count) | |
545 | { | |
546 | struct tun_pi pi = { 0, __constant_htons(ETH_P_IP) }; | |
547 | struct sk_buff *skb; | |
548 | size_t len = count, align = 0; | |
f43798c2 | 549 | struct virtio_net_hdr gso = { 0 }; |
1da177e4 LT |
550 | |
551 | if (!(tun->flags & TUN_NO_PI)) { | |
552 | if ((len -= sizeof(pi)) > count) | |
553 | return -EINVAL; | |
554 | ||
555 | if(memcpy_fromiovec((void *)&pi, iv, sizeof(pi))) | |
556 | return -EFAULT; | |
557 | } | |
558 | ||
f43798c2 RR |
559 | if (tun->flags & TUN_VNET_HDR) { |
560 | if ((len -= sizeof(gso)) > count) | |
561 | return -EINVAL; | |
562 | ||
563 | if (memcpy_fromiovec((void *)&gso, iv, sizeof(gso))) | |
564 | return -EFAULT; | |
565 | ||
566 | if (gso.hdr_len > len) | |
567 | return -EINVAL; | |
568 | } | |
569 | ||
e01bf1c8 | 570 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
1da177e4 | 571 | align = NET_IP_ALIGN; |
e01bf1c8 RR |
572 | if (unlikely(len < ETH_HLEN)) |
573 | return -EINVAL; | |
574 | } | |
6aa20a22 | 575 | |
f42157cb | 576 | if (!(skb = tun_alloc_skb(align, len, gso.hdr_len, GFP_KERNEL))) { |
09f75cd7 | 577 | tun->dev->stats.rx_dropped++; |
1da177e4 LT |
578 | return -ENOMEM; |
579 | } | |
580 | ||
f42157cb | 581 | if (skb_copy_datagram_from_iovec(skb, 0, iv, len)) { |
09f75cd7 | 582 | tun->dev->stats.rx_dropped++; |
8f22757e | 583 | kfree_skb(skb); |
1da177e4 | 584 | return -EFAULT; |
8f22757e | 585 | } |
1da177e4 | 586 | |
f43798c2 RR |
587 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
588 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
589 | gso.csum_offset)) { | |
590 | tun->dev->stats.rx_frame_errors++; | |
591 | kfree_skb(skb); | |
592 | return -EINVAL; | |
593 | } | |
594 | } else if (tun->flags & TUN_NOCHECKSUM) | |
595 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
596 | ||
1da177e4 LT |
597 | switch (tun->flags & TUN_TYPE_MASK) { |
598 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
599 | if (tun->flags & TUN_NO_PI) { |
600 | switch (skb->data[0] & 0xf0) { | |
601 | case 0x40: | |
602 | pi.proto = htons(ETH_P_IP); | |
603 | break; | |
604 | case 0x60: | |
605 | pi.proto = htons(ETH_P_IPV6); | |
606 | break; | |
607 | default: | |
608 | tun->dev->stats.rx_dropped++; | |
609 | kfree_skb(skb); | |
610 | return -EINVAL; | |
611 | } | |
612 | } | |
613 | ||
459a98ed | 614 | skb_reset_mac_header(skb); |
1da177e4 | 615 | skb->protocol = pi.proto; |
4c13eb66 | 616 | skb->dev = tun->dev; |
1da177e4 LT |
617 | break; |
618 | case TUN_TAP_DEV: | |
619 | skb->protocol = eth_type_trans(skb, tun->dev); | |
620 | break; | |
621 | }; | |
622 | ||
f43798c2 RR |
623 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
624 | pr_debug("GSO!\n"); | |
625 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
626 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
627 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
628 | break; | |
629 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
630 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
631 | break; | |
632 | default: | |
633 | tun->dev->stats.rx_frame_errors++; | |
634 | kfree_skb(skb); | |
635 | return -EINVAL; | |
636 | } | |
637 | ||
638 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
639 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
640 | ||
641 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
642 | if (skb_shinfo(skb)->gso_size == 0) { | |
643 | tun->dev->stats.rx_frame_errors++; | |
644 | kfree_skb(skb); | |
645 | return -EINVAL; | |
646 | } | |
647 | ||
648 | /* Header must be checked, and gso_segs computed. */ | |
649 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
650 | skb_shinfo(skb)->gso_segs = 0; | |
651 | } | |
6aa20a22 | 652 | |
1da177e4 | 653 | netif_rx_ni(skb); |
6aa20a22 | 654 | |
09f75cd7 JG |
655 | tun->dev->stats.rx_packets++; |
656 | tun->dev->stats.rx_bytes += len; | |
1da177e4 LT |
657 | |
658 | return count; | |
6aa20a22 | 659 | } |
1da177e4 | 660 | |
ee0b3e67 BP |
661 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
662 | unsigned long count, loff_t pos) | |
1da177e4 | 663 | { |
631ab46b EB |
664 | struct tun_struct *tun = tun_get(iocb->ki_filp); |
665 | ssize_t result; | |
1da177e4 LT |
666 | |
667 | if (!tun) | |
668 | return -EBADFD; | |
669 | ||
670 | DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count); | |
671 | ||
631ab46b EB |
672 | result = tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count)); |
673 | ||
674 | tun_put(tun); | |
675 | return result; | |
1da177e4 LT |
676 | } |
677 | ||
1da177e4 LT |
678 | /* Put packet to the user space buffer */ |
679 | static __inline__ ssize_t tun_put_user(struct tun_struct *tun, | |
680 | struct sk_buff *skb, | |
681 | struct iovec *iv, int len) | |
682 | { | |
683 | struct tun_pi pi = { 0, skb->protocol }; | |
684 | ssize_t total = 0; | |
685 | ||
686 | if (!(tun->flags & TUN_NO_PI)) { | |
687 | if ((len -= sizeof(pi)) < 0) | |
688 | return -EINVAL; | |
689 | ||
690 | if (len < skb->len) { | |
691 | /* Packet will be striped */ | |
692 | pi.flags |= TUN_PKT_STRIP; | |
693 | } | |
6aa20a22 | 694 | |
1da177e4 LT |
695 | if (memcpy_toiovec(iv, (void *) &pi, sizeof(pi))) |
696 | return -EFAULT; | |
697 | total += sizeof(pi); | |
6aa20a22 | 698 | } |
1da177e4 | 699 | |
f43798c2 RR |
700 | if (tun->flags & TUN_VNET_HDR) { |
701 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
702 | if ((len -= sizeof(gso)) < 0) | |
703 | return -EINVAL; | |
704 | ||
705 | if (skb_is_gso(skb)) { | |
706 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
707 | ||
708 | /* This is a hint as to how much should be linear. */ | |
709 | gso.hdr_len = skb_headlen(skb); | |
710 | gso.gso_size = sinfo->gso_size; | |
711 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
712 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
713 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
714 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
715 | else | |
716 | BUG(); | |
717 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) | |
718 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
719 | } else | |
720 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
721 | ||
722 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
723 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
724 | gso.csum_start = skb->csum_start - skb_headroom(skb); | |
725 | gso.csum_offset = skb->csum_offset; | |
726 | } /* else everything is zero */ | |
727 | ||
728 | if (unlikely(memcpy_toiovec(iv, (void *)&gso, sizeof(gso)))) | |
729 | return -EFAULT; | |
730 | total += sizeof(gso); | |
731 | } | |
732 | ||
1da177e4 LT |
733 | len = min_t(int, skb->len, len); |
734 | ||
735 | skb_copy_datagram_iovec(skb, 0, iv, len); | |
736 | total += len; | |
737 | ||
09f75cd7 JG |
738 | tun->dev->stats.tx_packets++; |
739 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
740 | |
741 | return total; | |
742 | } | |
743 | ||
ee0b3e67 BP |
744 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, |
745 | unsigned long count, loff_t pos) | |
1da177e4 | 746 | { |
ee0b3e67 | 747 | struct file *file = iocb->ki_filp; |
b2430de3 EB |
748 | struct tun_file *tfile = file->private_data; |
749 | struct tun_struct *tun = __tun_get(tfile); | |
1da177e4 LT |
750 | DECLARE_WAITQUEUE(wait, current); |
751 | struct sk_buff *skb; | |
752 | ssize_t len, ret = 0; | |
753 | ||
754 | if (!tun) | |
755 | return -EBADFD; | |
756 | ||
757 | DBG(KERN_INFO "%s: tun_chr_read\n", tun->dev->name); | |
758 | ||
52427c9d | 759 | len = iov_length(iv, count); |
631ab46b EB |
760 | if (len < 0) { |
761 | ret = -EINVAL; | |
762 | goto out; | |
763 | } | |
1da177e4 | 764 | |
b2430de3 | 765 | add_wait_queue(&tfile->read_wait, &wait); |
1da177e4 | 766 | while (len) { |
1da177e4 LT |
767 | current->state = TASK_INTERRUPTIBLE; |
768 | ||
769 | /* Read frames from the queue */ | |
770 | if (!(skb=skb_dequeue(&tun->readq))) { | |
771 | if (file->f_flags & O_NONBLOCK) { | |
772 | ret = -EAGAIN; | |
773 | break; | |
774 | } | |
775 | if (signal_pending(current)) { | |
776 | ret = -ERESTARTSYS; | |
777 | break; | |
778 | } | |
c70f1829 EB |
779 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
780 | ret = -EIO; | |
781 | break; | |
782 | } | |
1da177e4 LT |
783 | |
784 | /* Nothing to read, let's sleep */ | |
785 | schedule(); | |
786 | continue; | |
787 | } | |
788 | netif_wake_queue(tun->dev); | |
789 | ||
f271b2cc MK |
790 | ret = tun_put_user(tun, skb, (struct iovec *) iv, len); |
791 | kfree_skb(skb); | |
792 | break; | |
1da177e4 LT |
793 | } |
794 | ||
795 | current->state = TASK_RUNNING; | |
b2430de3 | 796 | remove_wait_queue(&tfile->read_wait, &wait); |
1da177e4 | 797 | |
631ab46b EB |
798 | out: |
799 | tun_put(tun); | |
1da177e4 LT |
800 | return ret; |
801 | } | |
802 | ||
1da177e4 LT |
803 | static void tun_setup(struct net_device *dev) |
804 | { | |
805 | struct tun_struct *tun = netdev_priv(dev); | |
806 | ||
807 | skb_queue_head_init(&tun->readq); | |
1da177e4 LT |
808 | |
809 | tun->owner = -1; | |
8c644623 | 810 | tun->group = -1; |
1da177e4 | 811 | |
1da177e4 LT |
812 | dev->ethtool_ops = &tun_ethtool_ops; |
813 | dev->destructor = free_netdev; | |
814 | } | |
815 | ||
f019a7a5 EB |
816 | /* Trivial set of netlink ops to allow deleting tun or tap |
817 | * device with netlink. | |
818 | */ | |
819 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
820 | { | |
821 | return -EINVAL; | |
822 | } | |
823 | ||
824 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
825 | .kind = DRV_NAME, | |
826 | .priv_size = sizeof(struct tun_struct), | |
827 | .setup = tun_setup, | |
828 | .validate = tun_validate, | |
829 | }; | |
830 | ||
831 | ||
d647a591 | 832 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
833 | { |
834 | struct tun_struct *tun; | |
835 | struct net_device *dev; | |
836 | int err; | |
837 | ||
74a3e5a7 EB |
838 | dev = __dev_get_by_name(net, ifr->ifr_name); |
839 | if (dev) { | |
840 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) | |
841 | tun = netdev_priv(dev); | |
842 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
843 | tun = netdev_priv(dev); | |
844 | else | |
845 | return -EINVAL; | |
846 | ||
a7385ba2 EB |
847 | err = tun_attach(tun, file); |
848 | if (err < 0) | |
849 | return err; | |
6aa20a22 | 850 | } |
1da177e4 LT |
851 | else { |
852 | char *name; | |
853 | unsigned long flags = 0; | |
854 | ||
855 | err = -EINVAL; | |
856 | ||
ca6bb5d7 DW |
857 | if (!capable(CAP_NET_ADMIN)) |
858 | return -EPERM; | |
859 | ||
1da177e4 LT |
860 | /* Set dev type */ |
861 | if (ifr->ifr_flags & IFF_TUN) { | |
862 | /* TUN device */ | |
863 | flags |= TUN_TUN_DEV; | |
864 | name = "tun%d"; | |
865 | } else if (ifr->ifr_flags & IFF_TAP) { | |
866 | /* TAP device */ | |
867 | flags |= TUN_TAP_DEV; | |
868 | name = "tap%d"; | |
6aa20a22 | 869 | } else |
1da177e4 | 870 | goto failed; |
6aa20a22 | 871 | |
1da177e4 LT |
872 | if (*ifr->ifr_name) |
873 | name = ifr->ifr_name; | |
874 | ||
875 | dev = alloc_netdev(sizeof(struct tun_struct), name, | |
876 | tun_setup); | |
877 | if (!dev) | |
878 | return -ENOMEM; | |
879 | ||
fc54c658 | 880 | dev_net_set(dev, net); |
f019a7a5 | 881 | dev->rtnl_link_ops = &tun_link_ops; |
758e43b7 | 882 | |
1da177e4 LT |
883 | tun = netdev_priv(dev); |
884 | tun->dev = dev; | |
885 | tun->flags = flags; | |
f271b2cc | 886 | tun->txflt.count = 0; |
1da177e4 LT |
887 | |
888 | tun_net_init(dev); | |
889 | ||
890 | if (strchr(dev->name, '%')) { | |
891 | err = dev_alloc_name(dev, dev->name); | |
892 | if (err < 0) | |
893 | goto err_free_dev; | |
894 | } | |
895 | ||
896 | err = register_netdevice(tun->dev); | |
897 | if (err < 0) | |
898 | goto err_free_dev; | |
a7385ba2 EB |
899 | |
900 | err = tun_attach(tun, file); | |
901 | if (err < 0) | |
902 | goto err_free_dev; | |
1da177e4 LT |
903 | } |
904 | ||
905 | DBG(KERN_INFO "%s: tun_set_iff\n", tun->dev->name); | |
906 | ||
907 | if (ifr->ifr_flags & IFF_NO_PI) | |
908 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
909 | else |
910 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 LT |
911 | |
912 | if (ifr->ifr_flags & IFF_ONE_QUEUE) | |
913 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
914 | else |
915 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 916 | |
f43798c2 RR |
917 | if (ifr->ifr_flags & IFF_VNET_HDR) |
918 | tun->flags |= TUN_VNET_HDR; | |
919 | else | |
920 | tun->flags &= ~TUN_VNET_HDR; | |
921 | ||
e35259a9 MK |
922 | /* Make sure persistent devices do not get stuck in |
923 | * xoff state. | |
924 | */ | |
925 | if (netif_running(tun->dev)) | |
926 | netif_wake_queue(tun->dev); | |
927 | ||
1da177e4 LT |
928 | strcpy(ifr->ifr_name, tun->dev->name); |
929 | return 0; | |
930 | ||
931 | err_free_dev: | |
932 | free_netdev(dev); | |
933 | failed: | |
934 | return err; | |
935 | } | |
936 | ||
e3b99556 MM |
937 | static int tun_get_iff(struct net *net, struct file *file, struct ifreq *ifr) |
938 | { | |
631ab46b | 939 | struct tun_struct *tun = tun_get(file); |
e3b99556 MM |
940 | |
941 | if (!tun) | |
942 | return -EBADFD; | |
943 | ||
944 | DBG(KERN_INFO "%s: tun_get_iff\n", tun->dev->name); | |
945 | ||
946 | strcpy(ifr->ifr_name, tun->dev->name); | |
947 | ||
948 | ifr->ifr_flags = 0; | |
949 | ||
950 | if (ifr->ifr_flags & TUN_TUN_DEV) | |
951 | ifr->ifr_flags |= IFF_TUN; | |
952 | else | |
953 | ifr->ifr_flags |= IFF_TAP; | |
954 | ||
955 | if (tun->flags & TUN_NO_PI) | |
956 | ifr->ifr_flags |= IFF_NO_PI; | |
957 | ||
958 | if (tun->flags & TUN_ONE_QUEUE) | |
959 | ifr->ifr_flags |= IFF_ONE_QUEUE; | |
960 | ||
961 | if (tun->flags & TUN_VNET_HDR) | |
962 | ifr->ifr_flags |= IFF_VNET_HDR; | |
963 | ||
631ab46b | 964 | tun_put(tun); |
e3b99556 MM |
965 | return 0; |
966 | } | |
967 | ||
5228ddc9 RR |
968 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
969 | * privs required. */ | |
970 | static int set_offload(struct net_device *dev, unsigned long arg) | |
971 | { | |
972 | unsigned int old_features, features; | |
973 | ||
974 | old_features = dev->features; | |
975 | /* Unset features, set them as we chew on the arg. */ | |
976 | features = (old_features & ~(NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST | |
977 | |NETIF_F_TSO_ECN|NETIF_F_TSO|NETIF_F_TSO6)); | |
978 | ||
979 | if (arg & TUN_F_CSUM) { | |
980 | features |= NETIF_F_HW_CSUM|NETIF_F_SG|NETIF_F_FRAGLIST; | |
981 | arg &= ~TUN_F_CSUM; | |
982 | ||
983 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
984 | if (arg & TUN_F_TSO_ECN) { | |
985 | features |= NETIF_F_TSO_ECN; | |
986 | arg &= ~TUN_F_TSO_ECN; | |
987 | } | |
988 | if (arg & TUN_F_TSO4) | |
989 | features |= NETIF_F_TSO; | |
990 | if (arg & TUN_F_TSO6) | |
991 | features |= NETIF_F_TSO6; | |
992 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
993 | } | |
994 | } | |
995 | ||
996 | /* This gives the user a way to test for new features in future by | |
997 | * trying to set them. */ | |
998 | if (arg) | |
999 | return -EINVAL; | |
1000 | ||
1001 | dev->features = features; | |
1002 | if (old_features != dev->features) | |
1003 | netdev_features_change(dev); | |
1004 | ||
1005 | return 0; | |
1006 | } | |
1007 | ||
6aa20a22 | 1008 | static int tun_chr_ioctl(struct inode *inode, struct file *file, |
1da177e4 LT |
1009 | unsigned int cmd, unsigned long arg) |
1010 | { | |
36b50bab | 1011 | struct tun_file *tfile = file->private_data; |
631ab46b | 1012 | struct tun_struct *tun; |
1da177e4 LT |
1013 | void __user* argp = (void __user*)arg; |
1014 | struct ifreq ifr; | |
f271b2cc | 1015 | int ret; |
1da177e4 LT |
1016 | |
1017 | if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89) | |
1018 | if (copy_from_user(&ifr, argp, sizeof ifr)) | |
1019 | return -EFAULT; | |
1020 | ||
631ab46b EB |
1021 | if (cmd == TUNGETFEATURES) { |
1022 | /* Currently this just means: "what IFF flags are valid?". | |
1023 | * This is needed because we never checked for invalid flags on | |
1024 | * TUNSETIFF. */ | |
1025 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
1026 | IFF_VNET_HDR, | |
1027 | (unsigned int __user*)argp); | |
1028 | } | |
1029 | ||
36b50bab | 1030 | tun = __tun_get(tfile); |
1da177e4 LT |
1031 | if (cmd == TUNSETIFF && !tun) { |
1032 | int err; | |
1033 | ||
1034 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; | |
1035 | ||
1036 | rtnl_lock(); | |
36b50bab | 1037 | err = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 LT |
1038 | rtnl_unlock(); |
1039 | ||
1040 | if (err) | |
1041 | return err; | |
1042 | ||
1043 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
1044 | return -EFAULT; | |
1045 | return 0; | |
1046 | } | |
1047 | ||
07240fd0 | 1048 | |
1da177e4 LT |
1049 | if (!tun) |
1050 | return -EBADFD; | |
1051 | ||
1052 | DBG(KERN_INFO "%s: tun_chr_ioctl cmd %d\n", tun->dev->name, cmd); | |
1053 | ||
631ab46b | 1054 | ret = 0; |
1da177e4 | 1055 | switch (cmd) { |
e3b99556 MM |
1056 | case TUNGETIFF: |
1057 | ret = tun_get_iff(current->nsproxy->net_ns, file, &ifr); | |
1058 | if (ret) | |
631ab46b | 1059 | break; |
e3b99556 MM |
1060 | |
1061 | if (copy_to_user(argp, &ifr, sizeof(ifr))) | |
631ab46b | 1062 | ret = -EFAULT; |
e3b99556 MM |
1063 | break; |
1064 | ||
1da177e4 LT |
1065 | case TUNSETNOCSUM: |
1066 | /* Disable/Enable checksum */ | |
1067 | if (arg) | |
1068 | tun->flags |= TUN_NOCHECKSUM; | |
1069 | else | |
1070 | tun->flags &= ~TUN_NOCHECKSUM; | |
1071 | ||
1072 | DBG(KERN_INFO "%s: checksum %s\n", | |
1073 | tun->dev->name, arg ? "disabled" : "enabled"); | |
1074 | break; | |
1075 | ||
1076 | case TUNSETPERSIST: | |
1077 | /* Disable/Enable persist mode */ | |
1078 | if (arg) | |
1079 | tun->flags |= TUN_PERSIST; | |
1080 | else | |
1081 | tun->flags &= ~TUN_PERSIST; | |
1082 | ||
1083 | DBG(KERN_INFO "%s: persist %s\n", | |
c6e991de | 1084 | tun->dev->name, arg ? "enabled" : "disabled"); |
1da177e4 LT |
1085 | break; |
1086 | ||
1087 | case TUNSETOWNER: | |
1088 | /* Set owner of the device */ | |
1089 | tun->owner = (uid_t) arg; | |
1090 | ||
1091 | DBG(KERN_INFO "%s: owner set to %d\n", tun->dev->name, tun->owner); | |
1092 | break; | |
1093 | ||
8c644623 GG |
1094 | case TUNSETGROUP: |
1095 | /* Set group of the device */ | |
1096 | tun->group= (gid_t) arg; | |
1097 | ||
1098 | DBG(KERN_INFO "%s: group set to %d\n", tun->dev->name, tun->group); | |
1099 | break; | |
1100 | ||
ff4cc3ac MK |
1101 | case TUNSETLINK: |
1102 | /* Only allow setting the type when the interface is down */ | |
48abfe05 | 1103 | rtnl_lock(); |
ff4cc3ac MK |
1104 | if (tun->dev->flags & IFF_UP) { |
1105 | DBG(KERN_INFO "%s: Linktype set failed because interface is up\n", | |
1106 | tun->dev->name); | |
48abfe05 | 1107 | ret = -EBUSY; |
ff4cc3ac MK |
1108 | } else { |
1109 | tun->dev->type = (int) arg; | |
1110 | DBG(KERN_INFO "%s: linktype set to %d\n", tun->dev->name, tun->dev->type); | |
48abfe05 | 1111 | ret = 0; |
ff4cc3ac | 1112 | } |
48abfe05 | 1113 | rtnl_unlock(); |
631ab46b | 1114 | break; |
ff4cc3ac | 1115 | |
1da177e4 LT |
1116 | #ifdef TUN_DEBUG |
1117 | case TUNSETDEBUG: | |
1118 | tun->debug = arg; | |
1119 | break; | |
1120 | #endif | |
5228ddc9 | 1121 | case TUNSETOFFLOAD: |
5228ddc9 RR |
1122 | rtnl_lock(); |
1123 | ret = set_offload(tun->dev, arg); | |
1124 | rtnl_unlock(); | |
631ab46b | 1125 | break; |
5228ddc9 | 1126 | |
f271b2cc MK |
1127 | case TUNSETTXFILTER: |
1128 | /* Can be set only for TAPs */ | |
631ab46b | 1129 | ret = -EINVAL; |
f271b2cc | 1130 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 1131 | break; |
f271b2cc | 1132 | rtnl_lock(); |
c0e5a8c2 | 1133 | ret = update_filter(&tun->txflt, (void __user *)arg); |
f271b2cc | 1134 | rtnl_unlock(); |
631ab46b | 1135 | break; |
1da177e4 LT |
1136 | |
1137 | case SIOCGIFHWADDR: | |
f271b2cc MK |
1138 | /* Get hw addres */ |
1139 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); | |
1140 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
1141 | if (copy_to_user(argp, &ifr, sizeof ifr)) | |
631ab46b EB |
1142 | ret = -EFAULT; |
1143 | break; | |
1da177e4 LT |
1144 | |
1145 | case SIOCSIFHWADDR: | |
f271b2cc | 1146 | /* Set hw address */ |
e174961c JB |
1147 | DBG(KERN_DEBUG "%s: set hw address: %pM\n", |
1148 | tun->dev->name, ifr.ifr_hwaddr.sa_data); | |
40102371 KH |
1149 | |
1150 | rtnl_lock(); | |
1151 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); | |
1152 | rtnl_unlock(); | |
631ab46b | 1153 | break; |
1da177e4 | 1154 | default: |
631ab46b EB |
1155 | ret = -EINVAL; |
1156 | break; | |
1da177e4 LT |
1157 | }; |
1158 | ||
631ab46b EB |
1159 | tun_put(tun); |
1160 | return ret; | |
1da177e4 LT |
1161 | } |
1162 | ||
1163 | static int tun_chr_fasync(int fd, struct file *file, int on) | |
1164 | { | |
631ab46b | 1165 | struct tun_struct *tun = tun_get(file); |
1da177e4 LT |
1166 | int ret; |
1167 | ||
1168 | if (!tun) | |
1169 | return -EBADFD; | |
1170 | ||
1171 | DBG(KERN_INFO "%s: tun_chr_fasync %d\n", tun->dev->name, on); | |
1172 | ||
9d319522 | 1173 | lock_kernel(); |
1da177e4 | 1174 | if ((ret = fasync_helper(fd, file, on, &tun->fasync)) < 0) |
9d319522 | 1175 | goto out; |
6aa20a22 | 1176 | |
1da177e4 | 1177 | if (on) { |
609d7fa9 | 1178 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 1179 | if (ret) |
9d319522 | 1180 | goto out; |
1da177e4 | 1181 | tun->flags |= TUN_FASYNC; |
6aa20a22 | 1182 | } else |
1da177e4 | 1183 | tun->flags &= ~TUN_FASYNC; |
9d319522 JC |
1184 | ret = 0; |
1185 | out: | |
1186 | unlock_kernel(); | |
631ab46b | 1187 | tun_put(tun); |
9d319522 | 1188 | return ret; |
1da177e4 LT |
1189 | } |
1190 | ||
1191 | static int tun_chr_open(struct inode *inode, struct file * file) | |
1192 | { | |
631ab46b | 1193 | struct tun_file *tfile; |
fd3e05b6 | 1194 | cycle_kernel_lock(); |
1da177e4 | 1195 | DBG1(KERN_INFO "tunX: tun_chr_open\n"); |
631ab46b EB |
1196 | |
1197 | tfile = kmalloc(sizeof(*tfile), GFP_KERNEL); | |
1198 | if (!tfile) | |
1199 | return -ENOMEM; | |
c70f1829 | 1200 | atomic_set(&tfile->count, 0); |
631ab46b | 1201 | tfile->tun = NULL; |
36b50bab | 1202 | tfile->net = get_net(current->nsproxy->net_ns); |
b2430de3 | 1203 | init_waitqueue_head(&tfile->read_wait); |
631ab46b | 1204 | file->private_data = tfile; |
1da177e4 LT |
1205 | return 0; |
1206 | } | |
1207 | ||
1208 | static int tun_chr_close(struct inode *inode, struct file *file) | |
1209 | { | |
631ab46b EB |
1210 | struct tun_file *tfile = file->private_data; |
1211 | struct tun_struct *tun = __tun_get(tfile); | |
1da177e4 | 1212 | |
1da177e4 | 1213 | |
631ab46b EB |
1214 | if (tun) { |
1215 | DBG(KERN_INFO "%s: tun_chr_close\n", tun->dev->name); | |
1da177e4 | 1216 | |
631ab46b EB |
1217 | rtnl_lock(); |
1218 | __tun_detach(tun); | |
1da177e4 | 1219 | |
631ab46b EB |
1220 | /* If desireable, unregister the netdevice. */ |
1221 | if (!(tun->flags & TUN_PERSIST)) | |
1222 | unregister_netdevice(tun->dev); | |
1da177e4 | 1223 | |
631ab46b EB |
1224 | rtnl_unlock(); |
1225 | } | |
1da177e4 | 1226 | |
36b50bab | 1227 | put_net(tfile->net); |
631ab46b | 1228 | kfree(tfile); |
1da177e4 LT |
1229 | |
1230 | return 0; | |
1231 | } | |
1232 | ||
d54b1fdb | 1233 | static const struct file_operations tun_fops = { |
6aa20a22 | 1234 | .owner = THIS_MODULE, |
1da177e4 | 1235 | .llseek = no_llseek, |
ee0b3e67 BP |
1236 | .read = do_sync_read, |
1237 | .aio_read = tun_chr_aio_read, | |
1238 | .write = do_sync_write, | |
1239 | .aio_write = tun_chr_aio_write, | |
1da177e4 LT |
1240 | .poll = tun_chr_poll, |
1241 | .ioctl = tun_chr_ioctl, | |
1242 | .open = tun_chr_open, | |
1243 | .release = tun_chr_close, | |
6aa20a22 | 1244 | .fasync = tun_chr_fasync |
1da177e4 LT |
1245 | }; |
1246 | ||
1247 | static struct miscdevice tun_miscdev = { | |
1248 | .minor = TUN_MINOR, | |
1249 | .name = "tun", | |
1250 | .fops = &tun_fops, | |
1da177e4 LT |
1251 | }; |
1252 | ||
1253 | /* ethtool interface */ | |
1254 | ||
1255 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
1256 | { | |
1257 | cmd->supported = 0; | |
1258 | cmd->advertising = 0; | |
1259 | cmd->speed = SPEED_10; | |
1260 | cmd->duplex = DUPLEX_FULL; | |
1261 | cmd->port = PORT_TP; | |
1262 | cmd->phy_address = 0; | |
1263 | cmd->transceiver = XCVR_INTERNAL; | |
1264 | cmd->autoneg = AUTONEG_DISABLE; | |
1265 | cmd->maxtxpkt = 0; | |
1266 | cmd->maxrxpkt = 0; | |
1267 | return 0; | |
1268 | } | |
1269 | ||
1270 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
1271 | { | |
1272 | struct tun_struct *tun = netdev_priv(dev); | |
1273 | ||
1274 | strcpy(info->driver, DRV_NAME); | |
1275 | strcpy(info->version, DRV_VERSION); | |
1276 | strcpy(info->fw_version, "N/A"); | |
1277 | ||
1278 | switch (tun->flags & TUN_TYPE_MASK) { | |
1279 | case TUN_TUN_DEV: | |
1280 | strcpy(info->bus_info, "tun"); | |
1281 | break; | |
1282 | case TUN_TAP_DEV: | |
1283 | strcpy(info->bus_info, "tap"); | |
1284 | break; | |
1285 | } | |
1286 | } | |
1287 | ||
1288 | static u32 tun_get_msglevel(struct net_device *dev) | |
1289 | { | |
1290 | #ifdef TUN_DEBUG | |
1291 | struct tun_struct *tun = netdev_priv(dev); | |
1292 | return tun->debug; | |
1293 | #else | |
1294 | return -EOPNOTSUPP; | |
1295 | #endif | |
1296 | } | |
1297 | ||
1298 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
1299 | { | |
1300 | #ifdef TUN_DEBUG | |
1301 | struct tun_struct *tun = netdev_priv(dev); | |
1302 | tun->debug = value; | |
1303 | #endif | |
1304 | } | |
1305 | ||
1306 | static u32 tun_get_link(struct net_device *dev) | |
1307 | { | |
1308 | struct tun_struct *tun = netdev_priv(dev); | |
631ab46b | 1309 | return !!tun->tfile; |
1da177e4 LT |
1310 | } |
1311 | ||
1312 | static u32 tun_get_rx_csum(struct net_device *dev) | |
1313 | { | |
1314 | struct tun_struct *tun = netdev_priv(dev); | |
1315 | return (tun->flags & TUN_NOCHECKSUM) == 0; | |
1316 | } | |
1317 | ||
1318 | static int tun_set_rx_csum(struct net_device *dev, u32 data) | |
1319 | { | |
1320 | struct tun_struct *tun = netdev_priv(dev); | |
1321 | if (data) | |
1322 | tun->flags &= ~TUN_NOCHECKSUM; | |
1323 | else | |
1324 | tun->flags |= TUN_NOCHECKSUM; | |
1325 | return 0; | |
1326 | } | |
1327 | ||
7282d491 | 1328 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
1329 | .get_settings = tun_get_settings, |
1330 | .get_drvinfo = tun_get_drvinfo, | |
1331 | .get_msglevel = tun_get_msglevel, | |
1332 | .set_msglevel = tun_set_msglevel, | |
1333 | .get_link = tun_get_link, | |
1334 | .get_rx_csum = tun_get_rx_csum, | |
1335 | .set_rx_csum = tun_set_rx_csum | |
1336 | }; | |
1337 | ||
79d17604 | 1338 | |
1da177e4 LT |
1339 | static int __init tun_init(void) |
1340 | { | |
1341 | int ret = 0; | |
1342 | ||
1343 | printk(KERN_INFO "tun: %s, %s\n", DRV_DESCRIPTION, DRV_VERSION); | |
1344 | printk(KERN_INFO "tun: %s\n", DRV_COPYRIGHT); | |
1345 | ||
f019a7a5 | 1346 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 1347 | if (ret) { |
f019a7a5 EB |
1348 | printk(KERN_ERR "tun: Can't register link_ops\n"); |
1349 | goto err_linkops; | |
79d17604 PE |
1350 | } |
1351 | ||
1da177e4 | 1352 | ret = misc_register(&tun_miscdev); |
79d17604 | 1353 | if (ret) { |
1da177e4 | 1354 | printk(KERN_ERR "tun: Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
1355 | goto err_misc; |
1356 | } | |
f019a7a5 | 1357 | return 0; |
79d17604 | 1358 | err_misc: |
f019a7a5 EB |
1359 | rtnl_link_unregister(&tun_link_ops); |
1360 | err_linkops: | |
1da177e4 LT |
1361 | return ret; |
1362 | } | |
1363 | ||
1364 | static void tun_cleanup(void) | |
1365 | { | |
6aa20a22 | 1366 | misc_deregister(&tun_miscdev); |
f019a7a5 | 1367 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
1368 | } |
1369 | ||
1370 | module_init(tun_init); | |
1371 | module_exit(tun_cleanup); | |
1372 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
1373 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
1374 | MODULE_LICENSE("GPL"); | |
1375 | MODULE_ALIAS_MISCDEV(TUN_MINOR); |