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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 | ||
c8d68e6b JW |
112 | /* 1024 is probably a high enough limit: modern hypervisors seem to support on |
113 | * the order of 100-200 CPUs so this leaves us some breathing space if we want | |
114 | * to match a queue per guest CPU. | |
115 | */ | |
116 | #define MAX_TAP_QUEUES 1024 | |
117 | ||
96442e42 JW |
118 | #define TUN_FLOW_EXPIRE (3 * HZ) |
119 | ||
54f968d6 JW |
120 | /* A tun_file connects an open character device to a tuntap netdevice. It |
121 | * also contains all socket related strctures (except sock_fprog and tap_filter) | |
122 | * to serve as one transmit queue for tuntap device. The sock_fprog and | |
123 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 124 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 125 | * this). |
6e914fc7 JW |
126 | * |
127 | * RCU usage: | |
36fe8c09 | 128 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 129 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 130 | */ |
631ab46b | 131 | struct tun_file { |
54f968d6 JW |
132 | struct sock sk; |
133 | struct socket socket; | |
134 | struct socket_wq wq; | |
6e914fc7 | 135 | struct tun_struct __rcu *tun; |
36b50bab | 136 | struct net *net; |
54f968d6 JW |
137 | struct fasync_struct *fasync; |
138 | /* only used for fasnyc */ | |
139 | unsigned int flags; | |
c8d68e6b | 140 | u16 queue_index; |
4008e97f JW |
141 | struct list_head next; |
142 | struct tun_struct *detached; | |
631ab46b EB |
143 | }; |
144 | ||
96442e42 JW |
145 | struct tun_flow_entry { |
146 | struct hlist_node hash_link; | |
147 | struct rcu_head rcu; | |
148 | struct tun_struct *tun; | |
149 | ||
150 | u32 rxhash; | |
151 | int queue_index; | |
152 | unsigned long updated; | |
153 | }; | |
154 | ||
155 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
156 | ||
54f968d6 | 157 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 158 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
159 | * file were attached to a persist device. |
160 | */ | |
14daa021 | 161 | struct tun_struct { |
c8d68e6b JW |
162 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
163 | unsigned int numqueues; | |
f271b2cc | 164 | unsigned int flags; |
0625c883 EB |
165 | kuid_t owner; |
166 | kgid_t group; | |
14daa021 | 167 | |
14daa021 | 168 | struct net_device *dev; |
c8f44aff | 169 | netdev_features_t set_features; |
88255375 MM |
170 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
171 | NETIF_F_TSO6|NETIF_F_UFO) | |
d9d52b51 MT |
172 | |
173 | int vnet_hdr_sz; | |
54f968d6 JW |
174 | int sndbuf; |
175 | struct tap_filter txflt; | |
176 | struct sock_fprog fprog; | |
177 | /* protected by rtnl lock */ | |
178 | bool filter_attached; | |
14daa021 RR |
179 | #ifdef TUN_DEBUG |
180 | int debug; | |
1da177e4 | 181 | #endif |
96442e42 | 182 | spinlock_t lock; |
96442e42 JW |
183 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
184 | struct timer_list flow_gc_timer; | |
185 | unsigned long ageing_time; | |
4008e97f JW |
186 | unsigned int numdisabled; |
187 | struct list_head disabled; | |
5dbbaf2d | 188 | void *security; |
14daa021 | 189 | }; |
1da177e4 | 190 | |
96442e42 JW |
191 | static inline u32 tun_hashfn(u32 rxhash) |
192 | { | |
193 | return rxhash & 0x3ff; | |
194 | } | |
195 | ||
196 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
197 | { | |
198 | struct tun_flow_entry *e; | |
199 | struct hlist_node *n; | |
200 | ||
201 | hlist_for_each_entry_rcu(e, n, head, hash_link) { | |
202 | if (e->rxhash == rxhash) | |
203 | return e; | |
204 | } | |
205 | return NULL; | |
206 | } | |
207 | ||
208 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
209 | struct hlist_head *head, | |
210 | u32 rxhash, u16 queue_index) | |
211 | { | |
9fdc6bef ED |
212 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
213 | ||
96442e42 JW |
214 | if (e) { |
215 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
216 | rxhash, queue_index); | |
217 | e->updated = jiffies; | |
218 | e->rxhash = rxhash; | |
219 | e->queue_index = queue_index; | |
220 | e->tun = tun; | |
221 | hlist_add_head_rcu(&e->hash_link, head); | |
222 | } | |
223 | return e; | |
224 | } | |
225 | ||
96442e42 JW |
226 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
227 | { | |
228 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
229 | e->rxhash, e->queue_index); | |
230 | hlist_del_rcu(&e->hash_link); | |
9fdc6bef | 231 | kfree_rcu(e, rcu); |
96442e42 JW |
232 | } |
233 | ||
234 | static void tun_flow_flush(struct tun_struct *tun) | |
235 | { | |
236 | int i; | |
237 | ||
238 | spin_lock_bh(&tun->lock); | |
239 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
240 | struct tun_flow_entry *e; | |
241 | struct hlist_node *h, *n; | |
242 | ||
243 | hlist_for_each_entry_safe(e, h, n, &tun->flows[i], hash_link) | |
244 | tun_flow_delete(tun, e); | |
245 | } | |
246 | spin_unlock_bh(&tun->lock); | |
247 | } | |
248 | ||
249 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
250 | { | |
251 | int i; | |
252 | ||
253 | spin_lock_bh(&tun->lock); | |
254 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
255 | struct tun_flow_entry *e; | |
256 | struct hlist_node *h, *n; | |
257 | ||
258 | hlist_for_each_entry_safe(e, h, n, &tun->flows[i], hash_link) { | |
259 | if (e->queue_index == queue_index) | |
260 | tun_flow_delete(tun, e); | |
261 | } | |
262 | } | |
263 | spin_unlock_bh(&tun->lock); | |
264 | } | |
265 | ||
266 | static void tun_flow_cleanup(unsigned long data) | |
267 | { | |
268 | struct tun_struct *tun = (struct tun_struct *)data; | |
269 | unsigned long delay = tun->ageing_time; | |
270 | unsigned long next_timer = jiffies + delay; | |
271 | unsigned long count = 0; | |
272 | int i; | |
273 | ||
274 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
275 | ||
276 | spin_lock_bh(&tun->lock); | |
277 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
278 | struct tun_flow_entry *e; | |
279 | struct hlist_node *h, *n; | |
280 | ||
281 | hlist_for_each_entry_safe(e, h, n, &tun->flows[i], hash_link) { | |
282 | unsigned long this_timer; | |
283 | count++; | |
284 | this_timer = e->updated + delay; | |
285 | if (time_before_eq(this_timer, jiffies)) | |
286 | tun_flow_delete(tun, e); | |
287 | else if (time_before(this_timer, next_timer)) | |
288 | next_timer = this_timer; | |
289 | } | |
290 | } | |
291 | ||
292 | if (count) | |
293 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
294 | spin_unlock_bh(&tun->lock); | |
295 | } | |
296 | ||
49974420 | 297 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
96442e42 JW |
298 | u16 queue_index) |
299 | { | |
300 | struct hlist_head *head; | |
301 | struct tun_flow_entry *e; | |
302 | unsigned long delay = tun->ageing_time; | |
96442e42 JW |
303 | |
304 | if (!rxhash) | |
305 | return; | |
306 | else | |
307 | head = &tun->flows[tun_hashfn(rxhash)]; | |
308 | ||
309 | rcu_read_lock(); | |
310 | ||
311 | if (tun->numqueues == 1) | |
312 | goto unlock; | |
313 | ||
314 | e = tun_flow_find(head, rxhash); | |
315 | if (likely(e)) { | |
316 | /* TODO: keep queueing to old queue until it's empty? */ | |
317 | e->queue_index = queue_index; | |
318 | e->updated = jiffies; | |
319 | } else { | |
320 | spin_lock_bh(&tun->lock); | |
321 | if (!tun_flow_find(head, rxhash)) | |
322 | tun_flow_create(tun, head, rxhash, queue_index); | |
323 | ||
324 | if (!timer_pending(&tun->flow_gc_timer)) | |
325 | mod_timer(&tun->flow_gc_timer, | |
326 | round_jiffies_up(jiffies + delay)); | |
327 | spin_unlock_bh(&tun->lock); | |
328 | } | |
329 | ||
330 | unlock: | |
331 | rcu_read_unlock(); | |
332 | } | |
333 | ||
c8d68e6b JW |
334 | /* We try to identify a flow through its rxhash first. The reason that |
335 | * we do not check rxq no. is becuase some cards(e.g 82599), chooses | |
336 | * the rxq based on the txq where the last packet of the flow comes. As | |
337 | * the userspace application move between processors, we may get a | |
338 | * different rxq no. here. If we could not get rxhash, then we would | |
339 | * hope the rxq no. may help here. | |
340 | */ | |
341 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb) | |
342 | { | |
343 | struct tun_struct *tun = netdev_priv(dev); | |
96442e42 | 344 | struct tun_flow_entry *e; |
c8d68e6b JW |
345 | u32 txq = 0; |
346 | u32 numqueues = 0; | |
347 | ||
348 | rcu_read_lock(); | |
349 | numqueues = tun->numqueues; | |
350 | ||
351 | txq = skb_get_rxhash(skb); | |
352 | if (txq) { | |
96442e42 JW |
353 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
354 | if (e) | |
355 | txq = e->queue_index; | |
356 | else | |
357 | /* use multiply and shift instead of expensive divide */ | |
358 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
359 | } else if (likely(skb_rx_queue_recorded(skb))) { |
360 | txq = skb_get_rx_queue(skb); | |
361 | while (unlikely(txq >= numqueues)) | |
362 | txq -= numqueues; | |
363 | } | |
364 | ||
365 | rcu_read_unlock(); | |
366 | return txq; | |
367 | } | |
368 | ||
cde8b15f JW |
369 | static inline bool tun_not_capable(struct tun_struct *tun) |
370 | { | |
371 | const struct cred *cred = current_cred(); | |
c260b772 | 372 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
373 | |
374 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
375 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 376 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
377 | } |
378 | ||
c8d68e6b JW |
379 | static void tun_set_real_num_queues(struct tun_struct *tun) |
380 | { | |
381 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
382 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
383 | } | |
384 | ||
4008e97f JW |
385 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
386 | { | |
387 | tfile->detached = tun; | |
388 | list_add_tail(&tfile->next, &tun->disabled); | |
389 | ++tun->numdisabled; | |
390 | } | |
391 | ||
d32649d1 | 392 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
393 | { |
394 | struct tun_struct *tun = tfile->detached; | |
395 | ||
396 | tfile->detached = NULL; | |
397 | list_del_init(&tfile->next); | |
398 | --tun->numdisabled; | |
399 | return tun; | |
400 | } | |
401 | ||
c8d68e6b JW |
402 | static void __tun_detach(struct tun_file *tfile, bool clean) |
403 | { | |
404 | struct tun_file *ntfile; | |
405 | struct tun_struct *tun; | |
406 | struct net_device *dev; | |
407 | ||
b8deabd3 JW |
408 | tun = rtnl_dereference(tfile->tun); |
409 | ||
c8d68e6b JW |
410 | if (tun) { |
411 | u16 index = tfile->queue_index; | |
412 | BUG_ON(index >= tun->numqueues); | |
413 | dev = tun->dev; | |
414 | ||
415 | rcu_assign_pointer(tun->tfiles[index], | |
416 | tun->tfiles[tun->numqueues - 1]); | |
417 | rcu_assign_pointer(tfile->tun, NULL); | |
b8deabd3 | 418 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
419 | ntfile->queue_index = index; |
420 | ||
421 | --tun->numqueues; | |
4008e97f JW |
422 | if (clean) |
423 | sock_put(&tfile->sk); | |
424 | else | |
425 | tun_disable_queue(tun, tfile); | |
c8d68e6b JW |
426 | |
427 | synchronize_net(); | |
96442e42 | 428 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b JW |
429 | /* Drop read queue */ |
430 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
431 | tun_set_real_num_queues(tun); | |
dd38bd85 | 432 | } else if (tfile->detached && clean) { |
4008e97f | 433 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
434 | sock_put(&tfile->sk); |
435 | } | |
c8d68e6b JW |
436 | |
437 | if (clean) { | |
4008e97f JW |
438 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0 && |
439 | !(tun->flags & TUN_PERSIST)) | |
440 | if (tun->dev->reg_state == NETREG_REGISTERED) | |
441 | unregister_netdevice(tun->dev); | |
442 | ||
c8d68e6b JW |
443 | BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED, |
444 | &tfile->socket.flags)); | |
445 | sk_release_kernel(&tfile->sk); | |
446 | } | |
447 | } | |
448 | ||
449 | static void tun_detach(struct tun_file *tfile, bool clean) | |
450 | { | |
451 | rtnl_lock(); | |
452 | __tun_detach(tfile, clean); | |
453 | rtnl_unlock(); | |
454 | } | |
455 | ||
456 | static void tun_detach_all(struct net_device *dev) | |
457 | { | |
458 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 459 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
460 | int i, n = tun->numqueues; |
461 | ||
462 | for (i = 0; i < n; i++) { | |
b8deabd3 | 463 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
464 | BUG_ON(!tfile); |
465 | wake_up_all(&tfile->wq.wait); | |
466 | rcu_assign_pointer(tfile->tun, NULL); | |
467 | --tun->numqueues; | |
468 | } | |
469 | BUG_ON(tun->numqueues != 0); | |
470 | ||
471 | synchronize_net(); | |
472 | for (i = 0; i < n; i++) { | |
b8deabd3 | 473 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
474 | /* Drop read queue */ |
475 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
476 | sock_put(&tfile->sk); | |
477 | } | |
4008e97f JW |
478 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
479 | tun_enable_queue(tfile); | |
480 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
481 | sock_put(&tfile->sk); | |
482 | } | |
483 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 JW |
484 | |
485 | if (tun->flags & TUN_PERSIST) | |
486 | module_put(THIS_MODULE); | |
c8d68e6b JW |
487 | } |
488 | ||
a7385ba2 EB |
489 | static int tun_attach(struct tun_struct *tun, struct file *file) |
490 | { | |
631ab46b | 491 | struct tun_file *tfile = file->private_data; |
38231b7a | 492 | int err; |
a7385ba2 | 493 | |
5dbbaf2d PM |
494 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
495 | if (err < 0) | |
496 | goto out; | |
497 | ||
38231b7a | 498 | err = -EINVAL; |
b8deabd3 | 499 | if (rtnl_dereference(tfile->tun)) |
38231b7a EB |
500 | goto out; |
501 | ||
502 | err = -EBUSY; | |
c8d68e6b JW |
503 | if (!(tun->flags & TUN_TAP_MQ) && tun->numqueues == 1) |
504 | goto out; | |
505 | ||
506 | err = -E2BIG; | |
4008e97f JW |
507 | if (!tfile->detached && |
508 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
509 | goto out; |
510 | ||
511 | err = 0; | |
54f968d6 | 512 | |
c8d68e6b | 513 | /* Re-attach the filter to presist device */ |
54f968d6 JW |
514 | if (tun->filter_attached == true) { |
515 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
516 | if (!err) | |
517 | goto out; | |
518 | } | |
c8d68e6b | 519 | tfile->queue_index = tun->numqueues; |
6e914fc7 | 520 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 521 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 522 | tun->numqueues++; |
a7385ba2 | 523 | |
4008e97f JW |
524 | if (tfile->detached) |
525 | tun_enable_queue(tfile); | |
526 | else | |
527 | sock_hold(&tfile->sk); | |
528 | ||
c8d68e6b | 529 | tun_set_real_num_queues(tun); |
a7385ba2 | 530 | |
c8d68e6b JW |
531 | /* device is allowed to go away first, so no need to hold extra |
532 | * refcnt. | |
533 | */ | |
534 | ||
535 | out: | |
536 | return err; | |
631ab46b EB |
537 | } |
538 | ||
539 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
540 | { | |
6e914fc7 | 541 | struct tun_struct *tun; |
c70f1829 | 542 | |
6e914fc7 JW |
543 | rcu_read_lock(); |
544 | tun = rcu_dereference(tfile->tun); | |
545 | if (tun) | |
546 | dev_hold(tun->dev); | |
547 | rcu_read_unlock(); | |
c70f1829 EB |
548 | |
549 | return tun; | |
631ab46b EB |
550 | } |
551 | ||
552 | static struct tun_struct *tun_get(struct file *file) | |
553 | { | |
554 | return __tun_get(file->private_data); | |
555 | } | |
556 | ||
557 | static void tun_put(struct tun_struct *tun) | |
558 | { | |
6e914fc7 | 559 | dev_put(tun->dev); |
631ab46b EB |
560 | } |
561 | ||
6b8a66ee | 562 | /* TAP filtering */ |
f271b2cc MK |
563 | static void addr_hash_set(u32 *mask, const u8 *addr) |
564 | { | |
565 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
566 | mask[n >> 5] |= (1 << (n & 31)); | |
567 | } | |
568 | ||
569 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
570 | { | |
571 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
572 | return mask[n >> 5] & (1 << (n & 31)); | |
573 | } | |
574 | ||
575 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
576 | { | |
577 | struct { u8 u[ETH_ALEN]; } *addr; | |
578 | struct tun_filter uf; | |
579 | int err, alen, n, nexact; | |
580 | ||
581 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
582 | return -EFAULT; | |
583 | ||
584 | if (!uf.count) { | |
585 | /* Disabled */ | |
586 | filter->count = 0; | |
587 | return 0; | |
588 | } | |
589 | ||
590 | alen = ETH_ALEN * uf.count; | |
591 | addr = kmalloc(alen, GFP_KERNEL); | |
592 | if (!addr) | |
593 | return -ENOMEM; | |
594 | ||
595 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
596 | err = -EFAULT; | |
597 | goto done; | |
598 | } | |
599 | ||
600 | /* The filter is updated without holding any locks. Which is | |
601 | * perfectly safe. We disable it first and in the worst | |
602 | * case we'll accept a few undesired packets. */ | |
603 | filter->count = 0; | |
604 | wmb(); | |
605 | ||
606 | /* Use first set of addresses as an exact filter */ | |
607 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
608 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
609 | ||
610 | nexact = n; | |
611 | ||
cfbf84fc AW |
612 | /* Remaining multicast addresses are hashed, |
613 | * unicast will leave the filter disabled. */ | |
f271b2cc | 614 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
615 | for (; n < uf.count; n++) { |
616 | if (!is_multicast_ether_addr(addr[n].u)) { | |
617 | err = 0; /* no filter */ | |
618 | goto done; | |
619 | } | |
f271b2cc | 620 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 621 | } |
f271b2cc MK |
622 | |
623 | /* For ALLMULTI just set the mask to all ones. | |
624 | * This overrides the mask populated above. */ | |
625 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
626 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
627 | ||
628 | /* Now enable the filter */ | |
629 | wmb(); | |
630 | filter->count = nexact; | |
631 | ||
632 | /* Return the number of exact filters */ | |
633 | err = nexact; | |
634 | ||
635 | done: | |
636 | kfree(addr); | |
637 | return err; | |
638 | } | |
639 | ||
640 | /* Returns: 0 - drop, !=0 - accept */ | |
641 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
642 | { | |
643 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
644 | * at this point. */ | |
645 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
646 | int i; | |
647 | ||
648 | /* Exact match */ | |
649 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 650 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
651 | return 1; |
652 | ||
653 | /* Inexact match (multicast only) */ | |
654 | if (is_multicast_ether_addr(eh->h_dest)) | |
655 | return addr_hash_test(filter->mask, eh->h_dest); | |
656 | ||
657 | return 0; | |
658 | } | |
659 | ||
660 | /* | |
661 | * Checks whether the packet is accepted or not. | |
662 | * Returns: 0 - drop, !=0 - accept | |
663 | */ | |
664 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
665 | { | |
666 | if (!filter->count) | |
667 | return 1; | |
668 | ||
669 | return run_filter(filter, skb); | |
670 | } | |
671 | ||
1da177e4 LT |
672 | /* Network device part of the driver */ |
673 | ||
7282d491 | 674 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 675 | |
c70f1829 EB |
676 | /* Net device detach from fd. */ |
677 | static void tun_net_uninit(struct net_device *dev) | |
678 | { | |
c8d68e6b | 679 | tun_detach_all(dev); |
c70f1829 EB |
680 | } |
681 | ||
1da177e4 LT |
682 | /* Net device open. */ |
683 | static int tun_net_open(struct net_device *dev) | |
684 | { | |
c8d68e6b | 685 | netif_tx_start_all_queues(dev); |
1da177e4 LT |
686 | return 0; |
687 | } | |
688 | ||
689 | /* Net device close. */ | |
690 | static int tun_net_close(struct net_device *dev) | |
691 | { | |
c8d68e6b | 692 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
693 | return 0; |
694 | } | |
695 | ||
696 | /* Net device start xmit */ | |
424efe9c | 697 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
698 | { |
699 | struct tun_struct *tun = netdev_priv(dev); | |
c8d68e6b | 700 | int txq = skb->queue_mapping; |
6e914fc7 | 701 | struct tun_file *tfile; |
1da177e4 | 702 | |
6e914fc7 | 703 | rcu_read_lock(); |
c8d68e6b JW |
704 | tfile = rcu_dereference(tun->tfiles[txq]); |
705 | ||
1da177e4 | 706 | /* Drop packet if interface is not attached */ |
c8d68e6b | 707 | if (txq >= tun->numqueues) |
1da177e4 LT |
708 | goto drop; |
709 | ||
6e914fc7 JW |
710 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
711 | ||
c8d68e6b JW |
712 | BUG_ON(!tfile); |
713 | ||
f271b2cc MK |
714 | /* Drop if the filter does not like it. |
715 | * This is a noop if the filter is disabled. | |
716 | * Filter can be enabled only for the TAP devices. */ | |
717 | if (!check_filter(&tun->txflt, skb)) | |
718 | goto drop; | |
719 | ||
54f968d6 JW |
720 | if (tfile->socket.sk->sk_filter && |
721 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
722 | goto drop; |
723 | ||
36fe8c09 | 724 | /* Limit the number of packets queued by dividing txq length with the |
c8d68e6b JW |
725 | * number of queues. |
726 | */ | |
54f968d6 | 727 | if (skb_queue_len(&tfile->socket.sk->sk_receive_queue) |
5d097109 MT |
728 | >= dev->tx_queue_len / tun->numqueues) |
729 | goto drop; | |
1da177e4 | 730 | |
0110d6f2 MT |
731 | /* Orphan the skb - required as we might hang on to it |
732 | * for indefinite time. */ | |
868eefeb MT |
733 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
734 | goto drop; | |
0110d6f2 MT |
735 | skb_orphan(skb); |
736 | ||
f271b2cc | 737 | /* Enqueue packet */ |
54f968d6 | 738 | skb_queue_tail(&tfile->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
739 | |
740 | /* Notify and wake up reader process */ | |
54f968d6 JW |
741 | if (tfile->flags & TUN_FASYNC) |
742 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
743 | wake_up_interruptible_poll(&tfile->wq.wait, POLLIN | | |
05c2828c | 744 | POLLRDNORM | POLLRDBAND); |
6e914fc7 JW |
745 | |
746 | rcu_read_unlock(); | |
6ed10654 | 747 | return NETDEV_TX_OK; |
1da177e4 LT |
748 | |
749 | drop: | |
09f75cd7 | 750 | dev->stats.tx_dropped++; |
149d36f7 | 751 | skb_tx_error(skb); |
1da177e4 | 752 | kfree_skb(skb); |
6e914fc7 | 753 | rcu_read_unlock(); |
6ed10654 | 754 | return NETDEV_TX_OK; |
1da177e4 LT |
755 | } |
756 | ||
f271b2cc | 757 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 758 | { |
f271b2cc MK |
759 | /* |
760 | * This callback is supposed to deal with mc filter in | |
761 | * _rx_ path and has nothing to do with the _tx_ path. | |
762 | * In rx path we always accept everything userspace gives us. | |
763 | */ | |
1da177e4 LT |
764 | } |
765 | ||
4885a504 ES |
766 | #define MIN_MTU 68 |
767 | #define MAX_MTU 65535 | |
768 | ||
769 | static int | |
770 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
771 | { | |
772 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
773 | return -EINVAL; | |
774 | dev->mtu = new_mtu; | |
775 | return 0; | |
776 | } | |
777 | ||
c8f44aff MM |
778 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
779 | netdev_features_t features) | |
88255375 MM |
780 | { |
781 | struct tun_struct *tun = netdev_priv(dev); | |
782 | ||
783 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
784 | } | |
bebd097a NH |
785 | #ifdef CONFIG_NET_POLL_CONTROLLER |
786 | static void tun_poll_controller(struct net_device *dev) | |
787 | { | |
788 | /* | |
789 | * Tun only receives frames when: | |
790 | * 1) the char device endpoint gets data from user space | |
791 | * 2) the tun socket gets a sendmsg call from user space | |
792 | * Since both of those are syncronous operations, we are guaranteed | |
793 | * never to have pending data when we poll for it | |
794 | * so theres nothing to do here but return. | |
795 | * We need this though so netpoll recognizes us as an interface that | |
796 | * supports polling, which enables bridge devices in virt setups to | |
797 | * still use netconsole | |
798 | */ | |
799 | return; | |
800 | } | |
801 | #endif | |
758e43b7 | 802 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 803 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
804 | .ndo_open = tun_net_open, |
805 | .ndo_stop = tun_net_close, | |
00829823 | 806 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 807 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 808 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 809 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
810 | #ifdef CONFIG_NET_POLL_CONTROLLER |
811 | .ndo_poll_controller = tun_poll_controller, | |
812 | #endif | |
758e43b7 SH |
813 | }; |
814 | ||
815 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 816 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
817 | .ndo_open = tun_net_open, |
818 | .ndo_stop = tun_net_close, | |
00829823 | 819 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 820 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 821 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 822 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
823 | .ndo_set_mac_address = eth_mac_addr, |
824 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 825 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
826 | #ifdef CONFIG_NET_POLL_CONTROLLER |
827 | .ndo_poll_controller = tun_poll_controller, | |
828 | #endif | |
758e43b7 SH |
829 | }; |
830 | ||
96442e42 JW |
831 | static int tun_flow_init(struct tun_struct *tun) |
832 | { | |
833 | int i; | |
834 | ||
96442e42 JW |
835 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
836 | INIT_HLIST_HEAD(&tun->flows[i]); | |
837 | ||
838 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
839 | setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); | |
840 | mod_timer(&tun->flow_gc_timer, | |
841 | round_jiffies_up(jiffies + tun->ageing_time)); | |
842 | ||
843 | return 0; | |
844 | } | |
845 | ||
846 | static void tun_flow_uninit(struct tun_struct *tun) | |
847 | { | |
848 | del_timer_sync(&tun->flow_gc_timer); | |
849 | tun_flow_flush(tun); | |
96442e42 JW |
850 | } |
851 | ||
1da177e4 LT |
852 | /* Initialize net device. */ |
853 | static void tun_net_init(struct net_device *dev) | |
854 | { | |
855 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 856 | |
1da177e4 LT |
857 | switch (tun->flags & TUN_TYPE_MASK) { |
858 | case TUN_TUN_DEV: | |
758e43b7 SH |
859 | dev->netdev_ops = &tun_netdev_ops; |
860 | ||
1da177e4 LT |
861 | /* Point-to-Point TUN Device */ |
862 | dev->hard_header_len = 0; | |
863 | dev->addr_len = 0; | |
864 | dev->mtu = 1500; | |
865 | ||
866 | /* Zero header length */ | |
6aa20a22 | 867 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
868 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
869 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
870 | break; | |
871 | ||
872 | case TUN_TAP_DEV: | |
7a0a9608 | 873 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 874 | /* Ethernet TAP Device */ |
1da177e4 | 875 | ether_setup(dev); |
550fd08c | 876 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 877 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 878 | |
f2cedb63 | 879 | eth_hw_addr_random(dev); |
36226a8d | 880 | |
1da177e4 LT |
881 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
882 | break; | |
883 | } | |
884 | } | |
885 | ||
886 | /* Character device part */ | |
887 | ||
888 | /* Poll */ | |
c8d68e6b | 889 | static unsigned int tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 890 | { |
b2430de3 EB |
891 | struct tun_file *tfile = file->private_data; |
892 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 893 | struct sock *sk; |
33dccbb0 | 894 | unsigned int mask = 0; |
1da177e4 LT |
895 | |
896 | if (!tun) | |
eac9e902 | 897 | return POLLERR; |
1da177e4 | 898 | |
54f968d6 | 899 | sk = tfile->socket.sk; |
3c8a9c63 | 900 | |
6b8a66ee | 901 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 902 | |
54f968d6 | 903 | poll_wait(file, &tfile->wq.wait, wait); |
6aa20a22 | 904 | |
89f56d1e | 905 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
906 | mask |= POLLIN | POLLRDNORM; |
907 | ||
33dccbb0 HX |
908 | if (sock_writeable(sk) || |
909 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
910 | sock_writeable(sk))) | |
911 | mask |= POLLOUT | POLLWRNORM; | |
912 | ||
c70f1829 EB |
913 | if (tun->dev->reg_state != NETREG_REGISTERED) |
914 | mask = POLLERR; | |
915 | ||
631ab46b | 916 | tun_put(tun); |
1da177e4 LT |
917 | return mask; |
918 | } | |
919 | ||
f42157cb RR |
920 | /* prepad is the amount to reserve at front. len is length after that. |
921 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 922 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 923 | size_t prepad, size_t len, |
924 | size_t linear, int noblock) | |
f42157cb | 925 | { |
54f968d6 | 926 | struct sock *sk = tfile->socket.sk; |
f42157cb | 927 | struct sk_buff *skb; |
33dccbb0 | 928 | int err; |
f42157cb RR |
929 | |
930 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 931 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 932 | linear = len; |
f42157cb | 933 | |
33dccbb0 HX |
934 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
935 | &err); | |
f42157cb | 936 | if (!skb) |
33dccbb0 | 937 | return ERR_PTR(err); |
f42157cb RR |
938 | |
939 | skb_reserve(skb, prepad); | |
940 | skb_put(skb, linear); | |
33dccbb0 HX |
941 | skb->data_len = len - linear; |
942 | skb->len += len - linear; | |
f42157cb RR |
943 | |
944 | return skb; | |
945 | } | |
946 | ||
0690899b MT |
947 | /* set skb frags from iovec, this can move to core network code for reuse */ |
948 | static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from, | |
949 | int offset, size_t count) | |
950 | { | |
951 | int len = iov_length(from, count) - offset; | |
952 | int copy = skb_headlen(skb); | |
953 | int size, offset1 = 0; | |
954 | int i = 0; | |
955 | ||
956 | /* Skip over from offset */ | |
957 | while (count && (offset >= from->iov_len)) { | |
958 | offset -= from->iov_len; | |
959 | ++from; | |
960 | --count; | |
961 | } | |
962 | ||
963 | /* copy up to skb headlen */ | |
964 | while (count && (copy > 0)) { | |
965 | size = min_t(unsigned int, copy, from->iov_len - offset); | |
966 | if (copy_from_user(skb->data + offset1, from->iov_base + offset, | |
967 | size)) | |
968 | return -EFAULT; | |
969 | if (copy > size) { | |
970 | ++from; | |
971 | --count; | |
972 | offset = 0; | |
973 | } else | |
974 | offset += size; | |
975 | copy -= size; | |
976 | offset1 += size; | |
977 | } | |
978 | ||
979 | if (len == offset1) | |
980 | return 0; | |
981 | ||
982 | while (count--) { | |
983 | struct page *page[MAX_SKB_FRAGS]; | |
984 | int num_pages; | |
985 | unsigned long base; | |
986 | unsigned long truesize; | |
987 | ||
988 | len = from->iov_len - offset; | |
989 | if (!len) { | |
990 | offset = 0; | |
991 | ++from; | |
992 | continue; | |
993 | } | |
994 | base = (unsigned long)from->iov_base + offset; | |
995 | size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT; | |
996 | if (i + size > MAX_SKB_FRAGS) | |
997 | return -EMSGSIZE; | |
998 | num_pages = get_user_pages_fast(base, size, 0, &page[i]); | |
999 | if (num_pages != size) { | |
1000 | for (i = 0; i < num_pages; i++) | |
1001 | put_page(page[i]); | |
1002 | return -EFAULT; | |
1003 | } | |
1004 | truesize = size * PAGE_SIZE; | |
1005 | skb->data_len += len; | |
1006 | skb->len += len; | |
1007 | skb->truesize += truesize; | |
1008 | atomic_add(truesize, &skb->sk->sk_wmem_alloc); | |
1009 | while (len) { | |
1010 | int off = base & ~PAGE_MASK; | |
1011 | int size = min_t(int, len, PAGE_SIZE - off); | |
1012 | __skb_fill_page_desc(skb, i, page[i], off, size); | |
1013 | skb_shinfo(skb)->nr_frags++; | |
1014 | /* increase sk_wmem_alloc */ | |
1015 | base += size; | |
1016 | len -= size; | |
1017 | i++; | |
1018 | } | |
1019 | offset = 0; | |
1020 | ++from; | |
1021 | } | |
1022 | return 0; | |
1023 | } | |
1024 | ||
1da177e4 | 1025 | /* Get packet from user space buffer */ |
54f968d6 JW |
1026 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
1027 | void *msg_control, const struct iovec *iv, | |
1028 | size_t total_len, size_t count, int noblock) | |
1da177e4 | 1029 | { |
09640e63 | 1030 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1031 | struct sk_buff *skb; |
0690899b | 1032 | size_t len = total_len, align = NET_SKB_PAD; |
f43798c2 | 1033 | struct virtio_net_hdr gso = { 0 }; |
6f26c9a7 | 1034 | int offset = 0; |
0690899b MT |
1035 | int copylen; |
1036 | bool zerocopy = false; | |
1037 | int err; | |
49974420 | 1038 | u32 rxhash; |
1da177e4 LT |
1039 | |
1040 | if (!(tun->flags & TUN_NO_PI)) { | |
0690899b | 1041 | if ((len -= sizeof(pi)) > total_len) |
1da177e4 LT |
1042 | return -EINVAL; |
1043 | ||
6f26c9a7 | 1044 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 1045 | return -EFAULT; |
6f26c9a7 | 1046 | offset += sizeof(pi); |
1da177e4 LT |
1047 | } |
1048 | ||
f43798c2 | 1049 | if (tun->flags & TUN_VNET_HDR) { |
0690899b | 1050 | if ((len -= tun->vnet_hdr_sz) > total_len) |
f43798c2 RR |
1051 | return -EINVAL; |
1052 | ||
6f26c9a7 | 1053 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
1054 | return -EFAULT; |
1055 | ||
4909122f HX |
1056 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
1057 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
1058 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
1059 | ||
f43798c2 RR |
1060 | if (gso.hdr_len > len) |
1061 | return -EINVAL; | |
d9d52b51 | 1062 | offset += tun->vnet_hdr_sz; |
f43798c2 RR |
1063 | } |
1064 | ||
e01bf1c8 | 1065 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
a504b86e | 1066 | align += NET_IP_ALIGN; |
0eca93bc HX |
1067 | if (unlikely(len < ETH_HLEN || |
1068 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
1069 | return -EINVAL; |
1070 | } | |
6aa20a22 | 1071 | |
0690899b MT |
1072 | if (msg_control) |
1073 | zerocopy = true; | |
1074 | ||
1075 | if (zerocopy) { | |
1076 | /* Userspace may produce vectors with count greater than | |
1077 | * MAX_SKB_FRAGS, so we need to linearize parts of the skb | |
1078 | * to let the rest of data to be fit in the frags. | |
1079 | */ | |
1080 | if (count > MAX_SKB_FRAGS) { | |
1081 | copylen = iov_length(iv, count - MAX_SKB_FRAGS); | |
1082 | if (copylen < offset) | |
1083 | copylen = 0; | |
1084 | else | |
1085 | copylen -= offset; | |
1086 | } else | |
1087 | copylen = 0; | |
1088 | /* There are 256 bytes to be copied in skb, so there is enough | |
1089 | * room for skb expand head in case it is used. | |
1090 | * The rest of the buffer is mapped from userspace. | |
1091 | */ | |
1092 | if (copylen < gso.hdr_len) | |
1093 | copylen = gso.hdr_len; | |
1094 | if (!copylen) | |
1095 | copylen = GOODCOPY_LEN; | |
1096 | } else | |
1097 | copylen = len; | |
1098 | ||
54f968d6 | 1099 | skb = tun_alloc_skb(tfile, align, copylen, gso.hdr_len, noblock); |
33dccbb0 HX |
1100 | if (IS_ERR(skb)) { |
1101 | if (PTR_ERR(skb) != -EAGAIN) | |
1102 | tun->dev->stats.rx_dropped++; | |
1103 | return PTR_ERR(skb); | |
1da177e4 LT |
1104 | } |
1105 | ||
0690899b MT |
1106 | if (zerocopy) |
1107 | err = zerocopy_sg_from_iovec(skb, iv, offset, count); | |
1108 | else | |
1109 | err = skb_copy_datagram_from_iovec(skb, 0, iv, offset, len); | |
1110 | ||
1111 | if (err) { | |
09f75cd7 | 1112 | tun->dev->stats.rx_dropped++; |
8f22757e | 1113 | kfree_skb(skb); |
1da177e4 | 1114 | return -EFAULT; |
8f22757e | 1115 | } |
1da177e4 | 1116 | |
f43798c2 RR |
1117 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
1118 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
1119 | gso.csum_offset)) { | |
1120 | tun->dev->stats.rx_frame_errors++; | |
1121 | kfree_skb(skb); | |
1122 | return -EINVAL; | |
1123 | } | |
88255375 | 1124 | } |
f43798c2 | 1125 | |
1da177e4 LT |
1126 | switch (tun->flags & TUN_TYPE_MASK) { |
1127 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
1128 | if (tun->flags & TUN_NO_PI) { |
1129 | switch (skb->data[0] & 0xf0) { | |
1130 | case 0x40: | |
1131 | pi.proto = htons(ETH_P_IP); | |
1132 | break; | |
1133 | case 0x60: | |
1134 | pi.proto = htons(ETH_P_IPV6); | |
1135 | break; | |
1136 | default: | |
1137 | tun->dev->stats.rx_dropped++; | |
1138 | kfree_skb(skb); | |
1139 | return -EINVAL; | |
1140 | } | |
1141 | } | |
1142 | ||
459a98ed | 1143 | skb_reset_mac_header(skb); |
1da177e4 | 1144 | skb->protocol = pi.proto; |
4c13eb66 | 1145 | skb->dev = tun->dev; |
1da177e4 LT |
1146 | break; |
1147 | case TUN_TAP_DEV: | |
1148 | skb->protocol = eth_type_trans(skb, tun->dev); | |
1149 | break; | |
6403eab1 | 1150 | } |
1da177e4 | 1151 | |
f43798c2 RR |
1152 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
1153 | pr_debug("GSO!\n"); | |
1154 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1155 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
1156 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
1157 | break; | |
1158 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
1159 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
1160 | break; | |
e36aa25a SS |
1161 | case VIRTIO_NET_HDR_GSO_UDP: |
1162 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
1163 | break; | |
f43798c2 RR |
1164 | default: |
1165 | tun->dev->stats.rx_frame_errors++; | |
1166 | kfree_skb(skb); | |
1167 | return -EINVAL; | |
1168 | } | |
1169 | ||
1170 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
1171 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
1172 | ||
1173 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
1174 | if (skb_shinfo(skb)->gso_size == 0) { | |
1175 | tun->dev->stats.rx_frame_errors++; | |
1176 | kfree_skb(skb); | |
1177 | return -EINVAL; | |
1178 | } | |
1179 | ||
1180 | /* Header must be checked, and gso_segs computed. */ | |
1181 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1182 | skb_shinfo(skb)->gso_segs = 0; | |
1183 | } | |
6aa20a22 | 1184 | |
0690899b MT |
1185 | /* copy skb_ubuf_info for callback when skb has no error */ |
1186 | if (zerocopy) { | |
1187 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1188 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
1189 | } | |
1190 | ||
76fe4581 | 1191 | skb_reset_network_header(skb); |
49974420 | 1192 | rxhash = skb_get_rxhash(skb); |
1da177e4 | 1193 | netif_rx_ni(skb); |
6aa20a22 | 1194 | |
09f75cd7 JG |
1195 | tun->dev->stats.rx_packets++; |
1196 | tun->dev->stats.rx_bytes += len; | |
1da177e4 | 1197 | |
49974420 | 1198 | tun_flow_update(tun, rxhash, tfile->queue_index); |
0690899b | 1199 | return total_len; |
6aa20a22 | 1200 | } |
1da177e4 | 1201 | |
ee0b3e67 BP |
1202 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
1203 | unsigned long count, loff_t pos) | |
1da177e4 | 1204 | { |
33dccbb0 | 1205 | struct file *file = iocb->ki_filp; |
ab46d779 | 1206 | struct tun_struct *tun = tun_get(file); |
54f968d6 | 1207 | struct tun_file *tfile = file->private_data; |
631ab46b | 1208 | ssize_t result; |
1da177e4 LT |
1209 | |
1210 | if (!tun) | |
1211 | return -EBADFD; | |
1212 | ||
6b8a66ee | 1213 | tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count); |
1da177e4 | 1214 | |
54f968d6 JW |
1215 | result = tun_get_user(tun, tfile, NULL, iv, iov_length(iv, count), |
1216 | count, file->f_flags & O_NONBLOCK); | |
631ab46b EB |
1217 | |
1218 | tun_put(tun); | |
1219 | return result; | |
1da177e4 LT |
1220 | } |
1221 | ||
1da177e4 | 1222 | /* Put packet to the user space buffer */ |
6f7c156c | 1223 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 1224 | struct tun_file *tfile, |
6f7c156c | 1225 | struct sk_buff *skb, |
1226 | const struct iovec *iv, int len) | |
1da177e4 LT |
1227 | { |
1228 | struct tun_pi pi = { 0, skb->protocol }; | |
1229 | ssize_t total = 0; | |
1230 | ||
1231 | if (!(tun->flags & TUN_NO_PI)) { | |
1232 | if ((len -= sizeof(pi)) < 0) | |
1233 | return -EINVAL; | |
1234 | ||
1235 | if (len < skb->len) { | |
1236 | /* Packet will be striped */ | |
1237 | pi.flags |= TUN_PKT_STRIP; | |
1238 | } | |
6aa20a22 | 1239 | |
43b39dcd | 1240 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
1241 | return -EFAULT; |
1242 | total += sizeof(pi); | |
6aa20a22 | 1243 | } |
1da177e4 | 1244 | |
f43798c2 RR |
1245 | if (tun->flags & TUN_VNET_HDR) { |
1246 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
d9d52b51 | 1247 | if ((len -= tun->vnet_hdr_sz) < 0) |
f43798c2 RR |
1248 | return -EINVAL; |
1249 | ||
1250 | if (skb_is_gso(skb)) { | |
1251 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1252 | ||
1253 | /* This is a hint as to how much should be linear. */ | |
1254 | gso.hdr_len = skb_headlen(skb); | |
1255 | gso.gso_size = sinfo->gso_size; | |
1256 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1257 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1258 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1259 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e36aa25a SS |
1260 | else if (sinfo->gso_type & SKB_GSO_UDP) |
1261 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
ef3db4a5 | 1262 | else { |
6b8a66ee | 1263 | pr_err("unexpected GSO type: " |
ef3db4a5 MT |
1264 | "0x%x, gso_size %d, hdr_len %d\n", |
1265 | sinfo->gso_type, gso.gso_size, | |
1266 | gso.hdr_len); | |
1267 | print_hex_dump(KERN_ERR, "tun: ", | |
1268 | DUMP_PREFIX_NONE, | |
1269 | 16, 1, skb->head, | |
1270 | min((int)gso.hdr_len, 64), true); | |
1271 | WARN_ON_ONCE(1); | |
1272 | return -EINVAL; | |
1273 | } | |
f43798c2 RR |
1274 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
1275 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1276 | } else | |
1277 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1278 | ||
1279 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1280 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 1281 | gso.csum_start = skb_checksum_start_offset(skb); |
f43798c2 | 1282 | gso.csum_offset = skb->csum_offset; |
10a8d94a JW |
1283 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
1284 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
f43798c2 RR |
1285 | } /* else everything is zero */ |
1286 | ||
43b39dcd MT |
1287 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
1288 | sizeof(gso)))) | |
f43798c2 | 1289 | return -EFAULT; |
d9d52b51 | 1290 | total += tun->vnet_hdr_sz; |
f43798c2 RR |
1291 | } |
1292 | ||
1da177e4 LT |
1293 | len = min_t(int, skb->len, len); |
1294 | ||
43b39dcd | 1295 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
05c2828c | 1296 | total += skb->len; |
1da177e4 | 1297 | |
09f75cd7 JG |
1298 | tun->dev->stats.tx_packets++; |
1299 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
1300 | |
1301 | return total; | |
1302 | } | |
1303 | ||
54f968d6 | 1304 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
05c2828c MT |
1305 | struct kiocb *iocb, const struct iovec *iv, |
1306 | ssize_t len, int noblock) | |
1da177e4 | 1307 | { |
1da177e4 LT |
1308 | DECLARE_WAITQUEUE(wait, current); |
1309 | struct sk_buff *skb; | |
05c2828c | 1310 | ssize_t ret = 0; |
1da177e4 | 1311 | |
3872baf6 | 1312 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 1313 | |
61a5ff15 | 1314 | if (unlikely(!noblock)) |
54f968d6 | 1315 | add_wait_queue(&tfile->wq.wait, &wait); |
1da177e4 | 1316 | while (len) { |
1da177e4 LT |
1317 | current->state = TASK_INTERRUPTIBLE; |
1318 | ||
1319 | /* Read frames from the queue */ | |
54f968d6 | 1320 | if (!(skb = skb_dequeue(&tfile->socket.sk->sk_receive_queue))) { |
05c2828c | 1321 | if (noblock) { |
1da177e4 LT |
1322 | ret = -EAGAIN; |
1323 | break; | |
1324 | } | |
1325 | if (signal_pending(current)) { | |
1326 | ret = -ERESTARTSYS; | |
1327 | break; | |
1328 | } | |
c70f1829 EB |
1329 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
1330 | ret = -EIO; | |
1331 | break; | |
1332 | } | |
1da177e4 LT |
1333 | |
1334 | /* Nothing to read, let's sleep */ | |
1335 | schedule(); | |
1336 | continue; | |
1337 | } | |
1da177e4 | 1338 | |
54f968d6 | 1339 | ret = tun_put_user(tun, tfile, skb, iv, len); |
f271b2cc MK |
1340 | kfree_skb(skb); |
1341 | break; | |
1da177e4 LT |
1342 | } |
1343 | ||
1344 | current->state = TASK_RUNNING; | |
61a5ff15 | 1345 | if (unlikely(!noblock)) |
54f968d6 | 1346 | remove_wait_queue(&tfile->wq.wait, &wait); |
1da177e4 | 1347 | |
05c2828c MT |
1348 | return ret; |
1349 | } | |
1350 | ||
1351 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
1352 | unsigned long count, loff_t pos) | |
1353 | { | |
1354 | struct file *file = iocb->ki_filp; | |
1355 | struct tun_file *tfile = file->private_data; | |
1356 | struct tun_struct *tun = __tun_get(tfile); | |
1357 | ssize_t len, ret; | |
1358 | ||
1359 | if (!tun) | |
1360 | return -EBADFD; | |
1361 | len = iov_length(iv, count); | |
1362 | if (len < 0) { | |
1363 | ret = -EINVAL; | |
1364 | goto out; | |
1365 | } | |
1366 | ||
54f968d6 JW |
1367 | ret = tun_do_read(tun, tfile, iocb, iv, len, |
1368 | file->f_flags & O_NONBLOCK); | |
05c2828c | 1369 | ret = min_t(ssize_t, ret, len); |
631ab46b EB |
1370 | out: |
1371 | tun_put(tun); | |
1da177e4 LT |
1372 | return ret; |
1373 | } | |
1374 | ||
96442e42 JW |
1375 | static void tun_free_netdev(struct net_device *dev) |
1376 | { | |
1377 | struct tun_struct *tun = netdev_priv(dev); | |
1378 | ||
4008e97f | 1379 | BUG_ON(!(list_empty(&tun->disabled))); |
96442e42 | 1380 | tun_flow_uninit(tun); |
5dbbaf2d | 1381 | security_tun_dev_free_security(tun->security); |
96442e42 JW |
1382 | free_netdev(dev); |
1383 | } | |
1384 | ||
1da177e4 LT |
1385 | static void tun_setup(struct net_device *dev) |
1386 | { | |
1387 | struct tun_struct *tun = netdev_priv(dev); | |
1388 | ||
0625c883 EB |
1389 | tun->owner = INVALID_UID; |
1390 | tun->group = INVALID_GID; | |
1da177e4 | 1391 | |
1da177e4 | 1392 | dev->ethtool_ops = &tun_ethtool_ops; |
96442e42 | 1393 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
1394 | } |
1395 | ||
f019a7a5 EB |
1396 | /* Trivial set of netlink ops to allow deleting tun or tap |
1397 | * device with netlink. | |
1398 | */ | |
1399 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1400 | { | |
1401 | return -EINVAL; | |
1402 | } | |
1403 | ||
1404 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1405 | .kind = DRV_NAME, | |
1406 | .priv_size = sizeof(struct tun_struct), | |
1407 | .setup = tun_setup, | |
1408 | .validate = tun_validate, | |
1409 | }; | |
1410 | ||
33dccbb0 HX |
1411 | static void tun_sock_write_space(struct sock *sk) |
1412 | { | |
54f968d6 | 1413 | struct tun_file *tfile; |
43815482 | 1414 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1415 | |
1416 | if (!sock_writeable(sk)) | |
1417 | return; | |
1418 | ||
33dccbb0 HX |
1419 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
1420 | return; | |
1421 | ||
43815482 ED |
1422 | wqueue = sk_sleep(sk); |
1423 | if (wqueue && waitqueue_active(wqueue)) | |
1424 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1425 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1426 | |
54f968d6 JW |
1427 | tfile = container_of(sk, struct tun_file, sk); |
1428 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
1429 | } |
1430 | ||
05c2828c MT |
1431 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
1432 | struct msghdr *m, size_t total_len) | |
1433 | { | |
54f968d6 JW |
1434 | int ret; |
1435 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1436 | struct tun_struct *tun = __tun_get(tfile); | |
1437 | ||
1438 | if (!tun) | |
1439 | return -EBADFD; | |
54f968d6 JW |
1440 | ret = tun_get_user(tun, tfile, m->msg_control, m->msg_iov, total_len, |
1441 | m->msg_iovlen, m->msg_flags & MSG_DONTWAIT); | |
1442 | tun_put(tun); | |
1443 | return ret; | |
05c2828c MT |
1444 | } |
1445 | ||
54f968d6 | 1446 | |
05c2828c MT |
1447 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, |
1448 | struct msghdr *m, size_t total_len, | |
1449 | int flags) | |
1450 | { | |
54f968d6 JW |
1451 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
1452 | struct tun_struct *tun = __tun_get(tfile); | |
05c2828c | 1453 | int ret; |
54f968d6 JW |
1454 | |
1455 | if (!tun) | |
1456 | return -EBADFD; | |
1457 | ||
05c2828c MT |
1458 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) |
1459 | return -EINVAL; | |
54f968d6 | 1460 | ret = tun_do_read(tun, tfile, iocb, m->msg_iov, total_len, |
05c2828c MT |
1461 | flags & MSG_DONTWAIT); |
1462 | if (ret > total_len) { | |
1463 | m->msg_flags |= MSG_TRUNC; | |
1464 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1465 | } | |
54f968d6 | 1466 | tun_put(tun); |
05c2828c MT |
1467 | return ret; |
1468 | } | |
1469 | ||
1ab5ecb9 SK |
1470 | static int tun_release(struct socket *sock) |
1471 | { | |
1472 | if (sock->sk) | |
1473 | sock_put(sock->sk); | |
1474 | return 0; | |
1475 | } | |
1476 | ||
05c2828c MT |
1477 | /* Ops structure to mimic raw sockets with tun */ |
1478 | static const struct proto_ops tun_socket_ops = { | |
1479 | .sendmsg = tun_sendmsg, | |
1480 | .recvmsg = tun_recvmsg, | |
1ab5ecb9 | 1481 | .release = tun_release, |
05c2828c MT |
1482 | }; |
1483 | ||
33dccbb0 HX |
1484 | static struct proto tun_proto = { |
1485 | .name = "tun", | |
1486 | .owner = THIS_MODULE, | |
54f968d6 | 1487 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 1488 | }; |
f019a7a5 | 1489 | |
980c9e8c DW |
1490 | static int tun_flags(struct tun_struct *tun) |
1491 | { | |
1492 | int flags = 0; | |
1493 | ||
1494 | if (tun->flags & TUN_TUN_DEV) | |
1495 | flags |= IFF_TUN; | |
1496 | else | |
1497 | flags |= IFF_TAP; | |
1498 | ||
1499 | if (tun->flags & TUN_NO_PI) | |
1500 | flags |= IFF_NO_PI; | |
1501 | ||
5d097109 MT |
1502 | /* This flag has no real effect. We track the value for backwards |
1503 | * compatibility. | |
1504 | */ | |
980c9e8c DW |
1505 | if (tun->flags & TUN_ONE_QUEUE) |
1506 | flags |= IFF_ONE_QUEUE; | |
1507 | ||
1508 | if (tun->flags & TUN_VNET_HDR) | |
1509 | flags |= IFF_VNET_HDR; | |
1510 | ||
c8d68e6b JW |
1511 | if (tun->flags & TUN_TAP_MQ) |
1512 | flags |= IFF_MULTI_QUEUE; | |
1513 | ||
980c9e8c DW |
1514 | return flags; |
1515 | } | |
1516 | ||
1517 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1518 | char *buf) | |
1519 | { | |
1520 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1521 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1522 | } | |
1523 | ||
1524 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1525 | char *buf) | |
1526 | { | |
1527 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1528 | return uid_valid(tun->owner)? |
1529 | sprintf(buf, "%u\n", | |
1530 | from_kuid_munged(current_user_ns(), tun->owner)): | |
1531 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1532 | } |
1533 | ||
1534 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1535 | char *buf) | |
1536 | { | |
1537 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1538 | return gid_valid(tun->group) ? |
1539 | sprintf(buf, "%u\n", | |
1540 | from_kgid_munged(current_user_ns(), tun->group)): | |
1541 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1542 | } |
1543 | ||
1544 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1545 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1546 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1547 | ||
d647a591 | 1548 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
1549 | { |
1550 | struct tun_struct *tun; | |
54f968d6 | 1551 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
1552 | struct net_device *dev; |
1553 | int err; | |
1554 | ||
7c0c3b1a JW |
1555 | if (tfile->detached) |
1556 | return -EINVAL; | |
1557 | ||
74a3e5a7 EB |
1558 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1559 | if (dev) { | |
f85ba780 DW |
1560 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1561 | return -EBUSY; | |
74a3e5a7 EB |
1562 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1563 | tun = netdev_priv(dev); | |
1564 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1565 | tun = netdev_priv(dev); | |
1566 | else | |
1567 | return -EINVAL; | |
1568 | ||
cde8b15f | 1569 | if (tun_not_capable(tun)) |
2b980dbd | 1570 | return -EPERM; |
5dbbaf2d | 1571 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
1572 | if (err < 0) |
1573 | return err; | |
1574 | ||
a7385ba2 EB |
1575 | err = tun_attach(tun, file); |
1576 | if (err < 0) | |
1577 | return err; | |
4008e97f JW |
1578 | |
1579 | if (tun->flags & TUN_TAP_MQ && | |
1580 | (tun->numqueues + tun->numdisabled > 1)) | |
1581 | return err; | |
6aa20a22 | 1582 | } |
1da177e4 LT |
1583 | else { |
1584 | char *name; | |
1585 | unsigned long flags = 0; | |
1586 | ||
c260b772 | 1587 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 1588 | return -EPERM; |
2b980dbd PM |
1589 | err = security_tun_dev_create(); |
1590 | if (err < 0) | |
1591 | return err; | |
ca6bb5d7 | 1592 | |
1da177e4 LT |
1593 | /* Set dev type */ |
1594 | if (ifr->ifr_flags & IFF_TUN) { | |
1595 | /* TUN device */ | |
1596 | flags |= TUN_TUN_DEV; | |
1597 | name = "tun%d"; | |
1598 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1599 | /* TAP device */ | |
1600 | flags |= TUN_TAP_DEV; | |
1601 | name = "tap%d"; | |
6aa20a22 | 1602 | } else |
36989b90 | 1603 | return -EINVAL; |
6aa20a22 | 1604 | |
1da177e4 LT |
1605 | if (*ifr->ifr_name) |
1606 | name = ifr->ifr_name; | |
1607 | ||
c8d68e6b JW |
1608 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
1609 | tun_setup, | |
1610 | MAX_TAP_QUEUES, MAX_TAP_QUEUES); | |
1da177e4 LT |
1611 | if (!dev) |
1612 | return -ENOMEM; | |
1613 | ||
fc54c658 | 1614 | dev_net_set(dev, net); |
f019a7a5 | 1615 | dev->rtnl_link_ops = &tun_link_ops; |
758e43b7 | 1616 | |
1da177e4 LT |
1617 | tun = netdev_priv(dev); |
1618 | tun->dev = dev; | |
1619 | tun->flags = flags; | |
f271b2cc | 1620 | tun->txflt.count = 0; |
d9d52b51 | 1621 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 1622 | |
54f968d6 JW |
1623 | tun->filter_attached = false; |
1624 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
33dccbb0 | 1625 | |
96442e42 JW |
1626 | spin_lock_init(&tun->lock); |
1627 | ||
5dbbaf2d PM |
1628 | err = security_tun_dev_alloc_security(&tun->security); |
1629 | if (err < 0) | |
1630 | goto err_free_dev; | |
2b980dbd | 1631 | |
1da177e4 LT |
1632 | tun_net_init(dev); |
1633 | ||
b3943aef PM |
1634 | err = tun_flow_init(tun); |
1635 | if (err < 0) | |
96442e42 JW |
1636 | goto err_free_dev; |
1637 | ||
88255375 MM |
1638 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
1639 | TUN_USER_FEATURES; | |
1640 | dev->features = dev->hw_features; | |
1641 | ||
4008e97f | 1642 | INIT_LIST_HEAD(&tun->disabled); |
eb0fb363 JW |
1643 | err = tun_attach(tun, file); |
1644 | if (err < 0) | |
1645 | goto err_free_dev; | |
1646 | ||
1da177e4 LT |
1647 | err = register_netdevice(tun->dev); |
1648 | if (err < 0) | |
54f968d6 | 1649 | goto err_free_dev; |
9c3fea6a | 1650 | |
980c9e8c DW |
1651 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1652 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1653 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
6b8a66ee | 1654 | pr_err("Failed to create tun sysfs files\n"); |
980c9e8c | 1655 | |
eb0fb363 | 1656 | netif_carrier_on(tun->dev); |
1da177e4 LT |
1657 | } |
1658 | ||
6b8a66ee | 1659 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 LT |
1660 | |
1661 | if (ifr->ifr_flags & IFF_NO_PI) | |
1662 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1663 | else |
1664 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 | 1665 | |
5d097109 MT |
1666 | /* This flag has no real effect. We track the value for backwards |
1667 | * compatibility. | |
1668 | */ | |
1da177e4 LT |
1669 | if (ifr->ifr_flags & IFF_ONE_QUEUE) |
1670 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1671 | else |
1672 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1673 | |
f43798c2 RR |
1674 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1675 | tun->flags |= TUN_VNET_HDR; | |
1676 | else | |
1677 | tun->flags &= ~TUN_VNET_HDR; | |
1678 | ||
c8d68e6b JW |
1679 | if (ifr->ifr_flags & IFF_MULTI_QUEUE) |
1680 | tun->flags |= TUN_TAP_MQ; | |
1681 | else | |
1682 | tun->flags &= ~TUN_TAP_MQ; | |
1683 | ||
e35259a9 MK |
1684 | /* Make sure persistent devices do not get stuck in |
1685 | * xoff state. | |
1686 | */ | |
1687 | if (netif_running(tun->dev)) | |
c8d68e6b | 1688 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 1689 | |
1da177e4 LT |
1690 | strcpy(ifr->ifr_name, tun->dev->name); |
1691 | return 0; | |
1692 | ||
1693 | err_free_dev: | |
1694 | free_netdev(dev); | |
1da177e4 LT |
1695 | return err; |
1696 | } | |
1697 | ||
9ce99cf6 | 1698 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 1699 | struct ifreq *ifr) |
e3b99556 | 1700 | { |
6b8a66ee | 1701 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1702 | |
1703 | strcpy(ifr->ifr_name, tun->dev->name); | |
1704 | ||
980c9e8c | 1705 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 1706 | |
e3b99556 MM |
1707 | } |
1708 | ||
5228ddc9 RR |
1709 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1710 | * privs required. */ | |
88255375 | 1711 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1712 | { |
c8f44aff | 1713 | netdev_features_t features = 0; |
5228ddc9 RR |
1714 | |
1715 | if (arg & TUN_F_CSUM) { | |
88255375 | 1716 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1717 | arg &= ~TUN_F_CSUM; |
1718 | ||
1719 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1720 | if (arg & TUN_F_TSO_ECN) { | |
1721 | features |= NETIF_F_TSO_ECN; | |
1722 | arg &= ~TUN_F_TSO_ECN; | |
1723 | } | |
1724 | if (arg & TUN_F_TSO4) | |
1725 | features |= NETIF_F_TSO; | |
1726 | if (arg & TUN_F_TSO6) | |
1727 | features |= NETIF_F_TSO6; | |
1728 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1729 | } | |
e36aa25a SS |
1730 | |
1731 | if (arg & TUN_F_UFO) { | |
1732 | features |= NETIF_F_UFO; | |
1733 | arg &= ~TUN_F_UFO; | |
1734 | } | |
5228ddc9 RR |
1735 | } |
1736 | ||
1737 | /* This gives the user a way to test for new features in future by | |
1738 | * trying to set them. */ | |
1739 | if (arg) | |
1740 | return -EINVAL; | |
1741 | ||
88255375 MM |
1742 | tun->set_features = features; |
1743 | netdev_update_features(tun->dev); | |
5228ddc9 RR |
1744 | |
1745 | return 0; | |
1746 | } | |
1747 | ||
c8d68e6b JW |
1748 | static void tun_detach_filter(struct tun_struct *tun, int n) |
1749 | { | |
1750 | int i; | |
1751 | struct tun_file *tfile; | |
1752 | ||
1753 | for (i = 0; i < n; i++) { | |
b8deabd3 | 1754 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1755 | sk_detach_filter(tfile->socket.sk); |
1756 | } | |
1757 | ||
1758 | tun->filter_attached = false; | |
1759 | } | |
1760 | ||
1761 | static int tun_attach_filter(struct tun_struct *tun) | |
1762 | { | |
1763 | int i, ret = 0; | |
1764 | struct tun_file *tfile; | |
1765 | ||
1766 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1767 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1768 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
1769 | if (ret) { | |
1770 | tun_detach_filter(tun, i); | |
1771 | return ret; | |
1772 | } | |
1773 | } | |
1774 | ||
1775 | tun->filter_attached = true; | |
1776 | return ret; | |
1777 | } | |
1778 | ||
1779 | static void tun_set_sndbuf(struct tun_struct *tun) | |
1780 | { | |
1781 | struct tun_file *tfile; | |
1782 | int i; | |
1783 | ||
1784 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1785 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1786 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
1787 | } | |
1788 | } | |
1789 | ||
cde8b15f JW |
1790 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
1791 | { | |
1792 | struct tun_file *tfile = file->private_data; | |
1793 | struct tun_struct *tun; | |
cde8b15f JW |
1794 | int ret = 0; |
1795 | ||
1796 | rtnl_lock(); | |
1797 | ||
1798 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 1799 | tun = tfile->detached; |
5dbbaf2d | 1800 | if (!tun) { |
cde8b15f | 1801 | ret = -EINVAL; |
5dbbaf2d PM |
1802 | goto unlock; |
1803 | } | |
1804 | ret = security_tun_dev_attach_queue(tun->security); | |
1805 | if (ret < 0) | |
1806 | goto unlock; | |
1807 | ret = tun_attach(tun, file); | |
4008e97f | 1808 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 1809 | tun = rtnl_dereference(tfile->tun); |
4008e97f JW |
1810 | if (!tun || !(tun->flags & TUN_TAP_MQ)) |
1811 | ret = -EINVAL; | |
1812 | else | |
1813 | __tun_detach(tfile, false); | |
1814 | } else | |
cde8b15f JW |
1815 | ret = -EINVAL; |
1816 | ||
5dbbaf2d | 1817 | unlock: |
cde8b15f JW |
1818 | rtnl_unlock(); |
1819 | return ret; | |
1820 | } | |
1821 | ||
50857e2a AB |
1822 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1823 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1824 | { |
36b50bab | 1825 | struct tun_file *tfile = file->private_data; |
631ab46b | 1826 | struct tun_struct *tun; |
1da177e4 LT |
1827 | void __user* argp = (void __user*)arg; |
1828 | struct ifreq ifr; | |
0625c883 EB |
1829 | kuid_t owner; |
1830 | kgid_t group; | |
33dccbb0 | 1831 | int sndbuf; |
d9d52b51 | 1832 | int vnet_hdr_sz; |
f271b2cc | 1833 | int ret; |
1da177e4 | 1834 | |
cde8b15f | 1835 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) { |
50857e2a | 1836 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 1837 | return -EFAULT; |
8bbb1813 | 1838 | } else { |
a117dacd | 1839 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 1840 | } |
631ab46b EB |
1841 | if (cmd == TUNGETFEATURES) { |
1842 | /* Currently this just means: "what IFF flags are valid?". | |
1843 | * This is needed because we never checked for invalid flags on | |
1844 | * TUNSETIFF. */ | |
1845 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
cde8b15f | 1846 | IFF_VNET_HDR | IFF_MULTI_QUEUE, |
631ab46b | 1847 | (unsigned int __user*)argp); |
cde8b15f JW |
1848 | } else if (cmd == TUNSETQUEUE) |
1849 | return tun_set_queue(file, &ifr); | |
631ab46b | 1850 | |
c8d68e6b | 1851 | ret = 0; |
876bfd4d HX |
1852 | rtnl_lock(); |
1853 | ||
36b50bab | 1854 | tun = __tun_get(tfile); |
1da177e4 | 1855 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1856 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1857 | ||
876bfd4d | 1858 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1859 | |
876bfd4d HX |
1860 | if (ret) |
1861 | goto unlock; | |
1da177e4 | 1862 | |
50857e2a | 1863 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1864 | ret = -EFAULT; |
1865 | goto unlock; | |
1da177e4 LT |
1866 | } |
1867 | ||
876bfd4d | 1868 | ret = -EBADFD; |
1da177e4 | 1869 | if (!tun) |
876bfd4d | 1870 | goto unlock; |
1da177e4 | 1871 | |
1e588338 | 1872 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 1873 | |
631ab46b | 1874 | ret = 0; |
1da177e4 | 1875 | switch (cmd) { |
e3b99556 | 1876 | case TUNGETIFF: |
9ce99cf6 | 1877 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1878 | |
50857e2a | 1879 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1880 | ret = -EFAULT; |
e3b99556 MM |
1881 | break; |
1882 | ||
1da177e4 LT |
1883 | case TUNSETNOCSUM: |
1884 | /* Disable/Enable checksum */ | |
1da177e4 | 1885 | |
88255375 MM |
1886 | /* [unimplemented] */ |
1887 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 1888 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
1889 | break; |
1890 | ||
1891 | case TUNSETPERSIST: | |
54f968d6 JW |
1892 | /* Disable/Enable persist mode. Keep an extra reference to the |
1893 | * module to prevent the module being unprobed. | |
1894 | */ | |
dd38bd85 | 1895 | if (arg && !(tun->flags & TUN_PERSIST)) { |
1da177e4 | 1896 | tun->flags |= TUN_PERSIST; |
54f968d6 | 1897 | __module_get(THIS_MODULE); |
dd38bd85 JW |
1898 | } |
1899 | if (!arg && (tun->flags & TUN_PERSIST)) { | |
1da177e4 | 1900 | tun->flags &= ~TUN_PERSIST; |
54f968d6 JW |
1901 | module_put(THIS_MODULE); |
1902 | } | |
1da177e4 | 1903 | |
6b8a66ee JP |
1904 | tun_debug(KERN_INFO, tun, "persist %s\n", |
1905 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
1906 | break; |
1907 | ||
1908 | case TUNSETOWNER: | |
1909 | /* Set owner of the device */ | |
0625c883 EB |
1910 | owner = make_kuid(current_user_ns(), arg); |
1911 | if (!uid_valid(owner)) { | |
1912 | ret = -EINVAL; | |
1913 | break; | |
1914 | } | |
1915 | tun->owner = owner; | |
1e588338 | 1916 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 1917 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
1918 | break; |
1919 | ||
8c644623 GG |
1920 | case TUNSETGROUP: |
1921 | /* Set group of the device */ | |
0625c883 EB |
1922 | group = make_kgid(current_user_ns(), arg); |
1923 | if (!gid_valid(group)) { | |
1924 | ret = -EINVAL; | |
1925 | break; | |
1926 | } | |
1927 | tun->group = group; | |
1e588338 | 1928 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 1929 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
1930 | break; |
1931 | ||
ff4cc3ac MK |
1932 | case TUNSETLINK: |
1933 | /* Only allow setting the type when the interface is down */ | |
1934 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
1935 | tun_debug(KERN_INFO, tun, |
1936 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 1937 | ret = -EBUSY; |
ff4cc3ac MK |
1938 | } else { |
1939 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
1940 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
1941 | tun->dev->type); | |
48abfe05 | 1942 | ret = 0; |
ff4cc3ac | 1943 | } |
631ab46b | 1944 | break; |
ff4cc3ac | 1945 | |
1da177e4 LT |
1946 | #ifdef TUN_DEBUG |
1947 | case TUNSETDEBUG: | |
1948 | tun->debug = arg; | |
1949 | break; | |
1950 | #endif | |
5228ddc9 | 1951 | case TUNSETOFFLOAD: |
88255375 | 1952 | ret = set_offload(tun, arg); |
631ab46b | 1953 | break; |
5228ddc9 | 1954 | |
f271b2cc MK |
1955 | case TUNSETTXFILTER: |
1956 | /* Can be set only for TAPs */ | |
631ab46b | 1957 | ret = -EINVAL; |
f271b2cc | 1958 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 1959 | break; |
c0e5a8c2 | 1960 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 1961 | break; |
1da177e4 LT |
1962 | |
1963 | case SIOCGIFHWADDR: | |
b595076a | 1964 | /* Get hw address */ |
f271b2cc MK |
1965 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
1966 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 1967 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
1968 | ret = -EFAULT; |
1969 | break; | |
1da177e4 LT |
1970 | |
1971 | case SIOCSIFHWADDR: | |
f271b2cc | 1972 | /* Set hw address */ |
6b8a66ee JP |
1973 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
1974 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 1975 | |
40102371 | 1976 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 1977 | break; |
33dccbb0 HX |
1978 | |
1979 | case TUNGETSNDBUF: | |
54f968d6 | 1980 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
1981 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
1982 | ret = -EFAULT; | |
1983 | break; | |
1984 | ||
1985 | case TUNSETSNDBUF: | |
1986 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
1987 | ret = -EFAULT; | |
1988 | break; | |
1989 | } | |
1990 | ||
c8d68e6b JW |
1991 | tun->sndbuf = sndbuf; |
1992 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
1993 | break; |
1994 | ||
d9d52b51 MT |
1995 | case TUNGETVNETHDRSZ: |
1996 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
1997 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
1998 | ret = -EFAULT; | |
1999 | break; | |
2000 | ||
2001 | case TUNSETVNETHDRSZ: | |
2002 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
2003 | ret = -EFAULT; | |
2004 | break; | |
2005 | } | |
2006 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
2007 | ret = -EINVAL; | |
2008 | break; | |
2009 | } | |
2010 | ||
2011 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
2012 | break; | |
2013 | ||
99405162 MT |
2014 | case TUNATTACHFILTER: |
2015 | /* Can be set only for TAPs */ | |
2016 | ret = -EINVAL; | |
2017 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2018 | break; | |
2019 | ret = -EFAULT; | |
54f968d6 | 2020 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
2021 | break; |
2022 | ||
c8d68e6b | 2023 | ret = tun_attach_filter(tun); |
99405162 MT |
2024 | break; |
2025 | ||
2026 | case TUNDETACHFILTER: | |
2027 | /* Can be set only for TAPs */ | |
2028 | ret = -EINVAL; | |
2029 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2030 | break; | |
c8d68e6b JW |
2031 | ret = 0; |
2032 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
2033 | break; |
2034 | ||
1da177e4 | 2035 | default: |
631ab46b EB |
2036 | ret = -EINVAL; |
2037 | break; | |
ee289b64 | 2038 | } |
1da177e4 | 2039 | |
876bfd4d HX |
2040 | unlock: |
2041 | rtnl_unlock(); | |
2042 | if (tun) | |
2043 | tun_put(tun); | |
631ab46b | 2044 | return ret; |
1da177e4 LT |
2045 | } |
2046 | ||
50857e2a AB |
2047 | static long tun_chr_ioctl(struct file *file, |
2048 | unsigned int cmd, unsigned long arg) | |
2049 | { | |
2050 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
2051 | } | |
2052 | ||
2053 | #ifdef CONFIG_COMPAT | |
2054 | static long tun_chr_compat_ioctl(struct file *file, | |
2055 | unsigned int cmd, unsigned long arg) | |
2056 | { | |
2057 | switch (cmd) { | |
2058 | case TUNSETIFF: | |
2059 | case TUNGETIFF: | |
2060 | case TUNSETTXFILTER: | |
2061 | case TUNGETSNDBUF: | |
2062 | case TUNSETSNDBUF: | |
2063 | case SIOCGIFHWADDR: | |
2064 | case SIOCSIFHWADDR: | |
2065 | arg = (unsigned long)compat_ptr(arg); | |
2066 | break; | |
2067 | default: | |
2068 | arg = (compat_ulong_t)arg; | |
2069 | break; | |
2070 | } | |
2071 | ||
2072 | /* | |
2073 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
2074 | * the end of that structure. All fields that are used in this | |
2075 | * driver are compatible though, we don't need to convert the | |
2076 | * contents. | |
2077 | */ | |
2078 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
2079 | } | |
2080 | #endif /* CONFIG_COMPAT */ | |
2081 | ||
1da177e4 LT |
2082 | static int tun_chr_fasync(int fd, struct file *file, int on) |
2083 | { | |
54f968d6 | 2084 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2085 | int ret; |
2086 | ||
54f968d6 | 2087 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 2088 | goto out; |
6aa20a22 | 2089 | |
1da177e4 | 2090 | if (on) { |
609d7fa9 | 2091 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 2092 | if (ret) |
9d319522 | 2093 | goto out; |
54f968d6 | 2094 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 2095 | } else |
54f968d6 | 2096 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
2097 | ret = 0; |
2098 | out: | |
9d319522 | 2099 | return ret; |
1da177e4 LT |
2100 | } |
2101 | ||
2102 | static int tun_chr_open(struct inode *inode, struct file * file) | |
2103 | { | |
631ab46b | 2104 | struct tun_file *tfile; |
deed49fb | 2105 | |
6b8a66ee | 2106 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 2107 | |
54f968d6 JW |
2108 | tfile = (struct tun_file *)sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL, |
2109 | &tun_proto); | |
631ab46b EB |
2110 | if (!tfile) |
2111 | return -ENOMEM; | |
6e914fc7 | 2112 | rcu_assign_pointer(tfile->tun, NULL); |
36b50bab | 2113 | tfile->net = get_net(current->nsproxy->net_ns); |
54f968d6 JW |
2114 | tfile->flags = 0; |
2115 | ||
2116 | rcu_assign_pointer(tfile->socket.wq, &tfile->wq); | |
2117 | init_waitqueue_head(&tfile->wq.wait); | |
2118 | ||
2119 | tfile->socket.file = file; | |
2120 | tfile->socket.ops = &tun_socket_ops; | |
2121 | ||
2122 | sock_init_data(&tfile->socket, &tfile->sk); | |
2123 | sk_change_net(&tfile->sk, tfile->net); | |
2124 | ||
2125 | tfile->sk.sk_write_space = tun_sock_write_space; | |
2126 | tfile->sk.sk_sndbuf = INT_MAX; | |
2127 | ||
631ab46b | 2128 | file->private_data = tfile; |
54f968d6 | 2129 | set_bit(SOCK_EXTERNALLY_ALLOCATED, &tfile->socket.flags); |
4008e97f | 2130 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 2131 | |
1da177e4 LT |
2132 | return 0; |
2133 | } | |
2134 | ||
2135 | static int tun_chr_close(struct inode *inode, struct file *file) | |
2136 | { | |
631ab46b | 2137 | struct tun_file *tfile = file->private_data; |
54f968d6 | 2138 | struct net *net = tfile->net; |
1da177e4 | 2139 | |
c8d68e6b | 2140 | tun_detach(tfile, true); |
54f968d6 | 2141 | put_net(net); |
1da177e4 LT |
2142 | |
2143 | return 0; | |
2144 | } | |
2145 | ||
d54b1fdb | 2146 | static const struct file_operations tun_fops = { |
6aa20a22 | 2147 | .owner = THIS_MODULE, |
1da177e4 | 2148 | .llseek = no_llseek, |
ee0b3e67 BP |
2149 | .read = do_sync_read, |
2150 | .aio_read = tun_chr_aio_read, | |
2151 | .write = do_sync_write, | |
2152 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 2153 | .poll = tun_chr_poll, |
50857e2a AB |
2154 | .unlocked_ioctl = tun_chr_ioctl, |
2155 | #ifdef CONFIG_COMPAT | |
2156 | .compat_ioctl = tun_chr_compat_ioctl, | |
2157 | #endif | |
1da177e4 LT |
2158 | .open = tun_chr_open, |
2159 | .release = tun_chr_close, | |
6aa20a22 | 2160 | .fasync = tun_chr_fasync |
1da177e4 LT |
2161 | }; |
2162 | ||
2163 | static struct miscdevice tun_miscdev = { | |
2164 | .minor = TUN_MINOR, | |
2165 | .name = "tun", | |
e454cea2 | 2166 | .nodename = "net/tun", |
1da177e4 | 2167 | .fops = &tun_fops, |
1da177e4 LT |
2168 | }; |
2169 | ||
2170 | /* ethtool interface */ | |
2171 | ||
2172 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
2173 | { | |
2174 | cmd->supported = 0; | |
2175 | cmd->advertising = 0; | |
70739497 | 2176 | ethtool_cmd_speed_set(cmd, SPEED_10); |
1da177e4 LT |
2177 | cmd->duplex = DUPLEX_FULL; |
2178 | cmd->port = PORT_TP; | |
2179 | cmd->phy_address = 0; | |
2180 | cmd->transceiver = XCVR_INTERNAL; | |
2181 | cmd->autoneg = AUTONEG_DISABLE; | |
2182 | cmd->maxtxpkt = 0; | |
2183 | cmd->maxrxpkt = 0; | |
2184 | return 0; | |
2185 | } | |
2186 | ||
2187 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
2188 | { | |
2189 | struct tun_struct *tun = netdev_priv(dev); | |
2190 | ||
33a5ba14 RJ |
2191 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
2192 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
2193 | |
2194 | switch (tun->flags & TUN_TYPE_MASK) { | |
2195 | case TUN_TUN_DEV: | |
33a5ba14 | 2196 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 LT |
2197 | break; |
2198 | case TUN_TAP_DEV: | |
33a5ba14 | 2199 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
2200 | break; |
2201 | } | |
2202 | } | |
2203 | ||
2204 | static u32 tun_get_msglevel(struct net_device *dev) | |
2205 | { | |
2206 | #ifdef TUN_DEBUG | |
2207 | struct tun_struct *tun = netdev_priv(dev); | |
2208 | return tun->debug; | |
2209 | #else | |
2210 | return -EOPNOTSUPP; | |
2211 | #endif | |
2212 | } | |
2213 | ||
2214 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
2215 | { | |
2216 | #ifdef TUN_DEBUG | |
2217 | struct tun_struct *tun = netdev_priv(dev); | |
2218 | tun->debug = value; | |
2219 | #endif | |
2220 | } | |
2221 | ||
7282d491 | 2222 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
2223 | .get_settings = tun_get_settings, |
2224 | .get_drvinfo = tun_get_drvinfo, | |
2225 | .get_msglevel = tun_get_msglevel, | |
2226 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 2227 | .get_link = ethtool_op_get_link, |
1da177e4 LT |
2228 | }; |
2229 | ||
79d17604 | 2230 | |
1da177e4 LT |
2231 | static int __init tun_init(void) |
2232 | { | |
2233 | int ret = 0; | |
2234 | ||
6b8a66ee JP |
2235 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
2236 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 2237 | |
f019a7a5 | 2238 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 2239 | if (ret) { |
6b8a66ee | 2240 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 2241 | goto err_linkops; |
79d17604 PE |
2242 | } |
2243 | ||
1da177e4 | 2244 | ret = misc_register(&tun_miscdev); |
79d17604 | 2245 | if (ret) { |
6b8a66ee | 2246 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
2247 | goto err_misc; |
2248 | } | |
f019a7a5 | 2249 | return 0; |
79d17604 | 2250 | err_misc: |
f019a7a5 EB |
2251 | rtnl_link_unregister(&tun_link_ops); |
2252 | err_linkops: | |
1da177e4 LT |
2253 | return ret; |
2254 | } | |
2255 | ||
2256 | static void tun_cleanup(void) | |
2257 | { | |
6aa20a22 | 2258 | misc_deregister(&tun_miscdev); |
f019a7a5 | 2259 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
2260 | } |
2261 | ||
05c2828c MT |
2262 | /* Get an underlying socket object from tun file. Returns error unless file is |
2263 | * attached to a device. The returned object works like a packet socket, it | |
2264 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
2265 | * holding a reference to the file for as long as the socket is in use. */ | |
2266 | struct socket *tun_get_socket(struct file *file) | |
2267 | { | |
6e914fc7 | 2268 | struct tun_file *tfile; |
05c2828c MT |
2269 | if (file->f_op != &tun_fops) |
2270 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
2271 | tfile = file->private_data; |
2272 | if (!tfile) | |
05c2828c | 2273 | return ERR_PTR(-EBADFD); |
54f968d6 | 2274 | return &tfile->socket; |
05c2828c MT |
2275 | } |
2276 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
2277 | ||
1da177e4 LT |
2278 | module_init(tun_init); |
2279 | module_exit(tun_cleanup); | |
2280 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
2281 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
2282 | MODULE_LICENSE("GPL"); | |
2283 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 2284 | MODULE_ALIAS("devname:net/tun"); |