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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> | |
6680ec68 | 63 | #include <linux/if_vlan.h> |
1da177e4 | 64 | #include <linux/crc32.h> |
d647a591 | 65 | #include <linux/nsproxy.h> |
f43798c2 | 66 | #include <linux/virtio_net.h> |
99405162 | 67 | #include <linux/rcupdate.h> |
881d966b | 68 | #include <net/net_namespace.h> |
79d17604 | 69 | #include <net/netns/generic.h> |
f019a7a5 | 70 | #include <net/rtnetlink.h> |
33dccbb0 | 71 | #include <net/sock.h> |
93e14b6d | 72 | #include <linux/seq_file.h> |
e0b46d0e | 73 | #include <linux/uio.h> |
1da177e4 | 74 | |
1da177e4 LT |
75 | #include <asm/uaccess.h> |
76 | ||
14daa021 RR |
77 | /* Uncomment to enable debugging */ |
78 | /* #define TUN_DEBUG 1 */ | |
79 | ||
1da177e4 LT |
80 | #ifdef TUN_DEBUG |
81 | static int debug; | |
14daa021 | 82 | |
6b8a66ee JP |
83 | #define tun_debug(level, tun, fmt, args...) \ |
84 | do { \ | |
85 | if (tun->debug) \ | |
86 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
87 | } while (0) | |
88 | #define DBG1(level, fmt, args...) \ | |
89 | do { \ | |
90 | if (debug == 2) \ | |
91 | printk(level fmt, ##args); \ | |
92 | } while (0) | |
14daa021 | 93 | #else |
6b8a66ee JP |
94 | #define tun_debug(level, tun, fmt, args...) \ |
95 | do { \ | |
96 | if (0) \ | |
97 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
98 | } while (0) | |
99 | #define DBG1(level, fmt, args...) \ | |
100 | do { \ | |
101 | if (0) \ | |
102 | printk(level fmt, ##args); \ | |
103 | } while (0) | |
14daa021 RR |
104 | #endif |
105 | ||
031f5e03 MT |
106 | /* TUN device flags */ |
107 | ||
108 | /* IFF_ATTACH_QUEUE is never stored in device flags, | |
109 | * overload it to mean fasync when stored there. | |
110 | */ | |
111 | #define TUN_FASYNC IFF_ATTACH_QUEUE | |
1cf8e410 MT |
112 | /* High bits in flags field are unused. */ |
113 | #define TUN_VNET_LE 0x80000000 | |
031f5e03 MT |
114 | |
115 | #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ | |
1cf8e410 | 116 | IFF_MULTI_QUEUE) |
0690899b MT |
117 | #define GOODCOPY_LEN 128 |
118 | ||
f271b2cc MK |
119 | #define FLT_EXACT_COUNT 8 |
120 | struct tap_filter { | |
121 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
122 | u32 mask[2]; /* Mask of the hashed addrs */ | |
123 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
124 | }; | |
125 | ||
baf71c5c PG |
126 | /* MAX_TAP_QUEUES 256 is chosen to allow rx/tx queues to be equal |
127 | * to max number of VCPUs in guest. */ | |
128 | #define MAX_TAP_QUEUES 256 | |
b8732fb7 | 129 | #define MAX_TAP_FLOWS 4096 |
c8d68e6b | 130 | |
96442e42 JW |
131 | #define TUN_FLOW_EXPIRE (3 * HZ) |
132 | ||
54f968d6 | 133 | /* A tun_file connects an open character device to a tuntap netdevice. It |
92d4ea6e | 134 | * also contains all socket related structures (except sock_fprog and tap_filter) |
54f968d6 JW |
135 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
136 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 137 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 138 | * this). |
6e914fc7 JW |
139 | * |
140 | * RCU usage: | |
36fe8c09 | 141 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 142 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 143 | */ |
631ab46b | 144 | struct tun_file { |
54f968d6 JW |
145 | struct sock sk; |
146 | struct socket socket; | |
147 | struct socket_wq wq; | |
6e914fc7 | 148 | struct tun_struct __rcu *tun; |
36b50bab | 149 | struct net *net; |
54f968d6 JW |
150 | struct fasync_struct *fasync; |
151 | /* only used for fasnyc */ | |
152 | unsigned int flags; | |
fb7589a1 PE |
153 | union { |
154 | u16 queue_index; | |
155 | unsigned int ifindex; | |
156 | }; | |
4008e97f JW |
157 | struct list_head next; |
158 | struct tun_struct *detached; | |
631ab46b EB |
159 | }; |
160 | ||
96442e42 JW |
161 | struct tun_flow_entry { |
162 | struct hlist_node hash_link; | |
163 | struct rcu_head rcu; | |
164 | struct tun_struct *tun; | |
165 | ||
166 | u32 rxhash; | |
9bc88939 | 167 | u32 rps_rxhash; |
96442e42 JW |
168 | int queue_index; |
169 | unsigned long updated; | |
170 | }; | |
171 | ||
172 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
173 | ||
54f968d6 | 174 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 175 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
176 | * file were attached to a persist device. |
177 | */ | |
14daa021 | 178 | struct tun_struct { |
c8d68e6b JW |
179 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
180 | unsigned int numqueues; | |
f271b2cc | 181 | unsigned int flags; |
0625c883 EB |
182 | kuid_t owner; |
183 | kgid_t group; | |
14daa021 | 184 | |
14daa021 | 185 | struct net_device *dev; |
c8f44aff | 186 | netdev_features_t set_features; |
88255375 | 187 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
e3e3c423 | 188 | NETIF_F_TSO6|NETIF_F_UFO) |
d9d52b51 MT |
189 | |
190 | int vnet_hdr_sz; | |
54f968d6 JW |
191 | int sndbuf; |
192 | struct tap_filter txflt; | |
193 | struct sock_fprog fprog; | |
194 | /* protected by rtnl lock */ | |
195 | bool filter_attached; | |
14daa021 RR |
196 | #ifdef TUN_DEBUG |
197 | int debug; | |
1da177e4 | 198 | #endif |
96442e42 | 199 | spinlock_t lock; |
96442e42 JW |
200 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
201 | struct timer_list flow_gc_timer; | |
202 | unsigned long ageing_time; | |
4008e97f JW |
203 | unsigned int numdisabled; |
204 | struct list_head disabled; | |
5dbbaf2d | 205 | void *security; |
b8732fb7 | 206 | u32 flow_count; |
14daa021 | 207 | }; |
1da177e4 | 208 | |
56f0dcc5 MT |
209 | static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val) |
210 | { | |
1cf8e410 | 211 | return __virtio16_to_cpu(tun->flags & TUN_VNET_LE, val); |
56f0dcc5 MT |
212 | } |
213 | ||
214 | static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val) | |
215 | { | |
1cf8e410 | 216 | return __cpu_to_virtio16(tun->flags & TUN_VNET_LE, val); |
56f0dcc5 MT |
217 | } |
218 | ||
96442e42 JW |
219 | static inline u32 tun_hashfn(u32 rxhash) |
220 | { | |
221 | return rxhash & 0x3ff; | |
222 | } | |
223 | ||
224 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
225 | { | |
226 | struct tun_flow_entry *e; | |
96442e42 | 227 | |
b67bfe0d | 228 | hlist_for_each_entry_rcu(e, head, hash_link) { |
96442e42 JW |
229 | if (e->rxhash == rxhash) |
230 | return e; | |
231 | } | |
232 | return NULL; | |
233 | } | |
234 | ||
235 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
236 | struct hlist_head *head, | |
237 | u32 rxhash, u16 queue_index) | |
238 | { | |
9fdc6bef ED |
239 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
240 | ||
96442e42 JW |
241 | if (e) { |
242 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
243 | rxhash, queue_index); | |
244 | e->updated = jiffies; | |
245 | e->rxhash = rxhash; | |
9bc88939 | 246 | e->rps_rxhash = 0; |
96442e42 JW |
247 | e->queue_index = queue_index; |
248 | e->tun = tun; | |
249 | hlist_add_head_rcu(&e->hash_link, head); | |
b8732fb7 | 250 | ++tun->flow_count; |
96442e42 JW |
251 | } |
252 | return e; | |
253 | } | |
254 | ||
96442e42 JW |
255 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
256 | { | |
257 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
258 | e->rxhash, e->queue_index); | |
9bc88939 | 259 | sock_rps_reset_flow_hash(e->rps_rxhash); |
96442e42 | 260 | hlist_del_rcu(&e->hash_link); |
9fdc6bef | 261 | kfree_rcu(e, rcu); |
b8732fb7 | 262 | --tun->flow_count; |
96442e42 JW |
263 | } |
264 | ||
265 | static void tun_flow_flush(struct tun_struct *tun) | |
266 | { | |
267 | int i; | |
268 | ||
269 | spin_lock_bh(&tun->lock); | |
270 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
271 | struct tun_flow_entry *e; | |
b67bfe0d | 272 | struct hlist_node *n; |
96442e42 | 273 | |
b67bfe0d | 274 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
96442e42 JW |
275 | tun_flow_delete(tun, e); |
276 | } | |
277 | spin_unlock_bh(&tun->lock); | |
278 | } | |
279 | ||
280 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
281 | { | |
282 | int i; | |
283 | ||
284 | spin_lock_bh(&tun->lock); | |
285 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
286 | struct tun_flow_entry *e; | |
b67bfe0d | 287 | struct hlist_node *n; |
96442e42 | 288 | |
b67bfe0d | 289 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
290 | if (e->queue_index == queue_index) |
291 | tun_flow_delete(tun, e); | |
292 | } | |
293 | } | |
294 | spin_unlock_bh(&tun->lock); | |
295 | } | |
296 | ||
297 | static void tun_flow_cleanup(unsigned long data) | |
298 | { | |
299 | struct tun_struct *tun = (struct tun_struct *)data; | |
300 | unsigned long delay = tun->ageing_time; | |
301 | unsigned long next_timer = jiffies + delay; | |
302 | unsigned long count = 0; | |
303 | int i; | |
304 | ||
305 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
306 | ||
307 | spin_lock_bh(&tun->lock); | |
308 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
309 | struct tun_flow_entry *e; | |
b67bfe0d | 310 | struct hlist_node *n; |
96442e42 | 311 | |
b67bfe0d | 312 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
313 | unsigned long this_timer; |
314 | count++; | |
315 | this_timer = e->updated + delay; | |
316 | if (time_before_eq(this_timer, jiffies)) | |
317 | tun_flow_delete(tun, e); | |
318 | else if (time_before(this_timer, next_timer)) | |
319 | next_timer = this_timer; | |
320 | } | |
321 | } | |
322 | ||
323 | if (count) | |
324 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
325 | spin_unlock_bh(&tun->lock); | |
326 | } | |
327 | ||
49974420 | 328 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
9e85722d | 329 | struct tun_file *tfile) |
96442e42 JW |
330 | { |
331 | struct hlist_head *head; | |
332 | struct tun_flow_entry *e; | |
333 | unsigned long delay = tun->ageing_time; | |
9e85722d | 334 | u16 queue_index = tfile->queue_index; |
96442e42 JW |
335 | |
336 | if (!rxhash) | |
337 | return; | |
338 | else | |
339 | head = &tun->flows[tun_hashfn(rxhash)]; | |
340 | ||
341 | rcu_read_lock(); | |
342 | ||
9e85722d JW |
343 | /* We may get a very small possibility of OOO during switching, not |
344 | * worth to optimize.*/ | |
345 | if (tun->numqueues == 1 || tfile->detached) | |
96442e42 JW |
346 | goto unlock; |
347 | ||
348 | e = tun_flow_find(head, rxhash); | |
349 | if (likely(e)) { | |
350 | /* TODO: keep queueing to old queue until it's empty? */ | |
351 | e->queue_index = queue_index; | |
352 | e->updated = jiffies; | |
9bc88939 | 353 | sock_rps_record_flow_hash(e->rps_rxhash); |
96442e42 JW |
354 | } else { |
355 | spin_lock_bh(&tun->lock); | |
b8732fb7 JW |
356 | if (!tun_flow_find(head, rxhash) && |
357 | tun->flow_count < MAX_TAP_FLOWS) | |
96442e42 JW |
358 | tun_flow_create(tun, head, rxhash, queue_index); |
359 | ||
360 | if (!timer_pending(&tun->flow_gc_timer)) | |
361 | mod_timer(&tun->flow_gc_timer, | |
362 | round_jiffies_up(jiffies + delay)); | |
363 | spin_unlock_bh(&tun->lock); | |
364 | } | |
365 | ||
366 | unlock: | |
367 | rcu_read_unlock(); | |
368 | } | |
369 | ||
9bc88939 TH |
370 | /** |
371 | * Save the hash received in the stack receive path and update the | |
372 | * flow_hash table accordingly. | |
373 | */ | |
374 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) | |
375 | { | |
376 | if (unlikely(e->rps_rxhash != hash)) { | |
377 | sock_rps_reset_flow_hash(e->rps_rxhash); | |
378 | e->rps_rxhash = hash; | |
379 | } | |
380 | } | |
381 | ||
c8d68e6b | 382 | /* We try to identify a flow through its rxhash first. The reason that |
92d4ea6e | 383 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
c8d68e6b JW |
384 | * the rxq based on the txq where the last packet of the flow comes. As |
385 | * the userspace application move between processors, we may get a | |
386 | * different rxq no. here. If we could not get rxhash, then we would | |
387 | * hope the rxq no. may help here. | |
388 | */ | |
f663dd9a | 389 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, |
99932d4f | 390 | void *accel_priv, select_queue_fallback_t fallback) |
c8d68e6b JW |
391 | { |
392 | struct tun_struct *tun = netdev_priv(dev); | |
96442e42 | 393 | struct tun_flow_entry *e; |
c8d68e6b JW |
394 | u32 txq = 0; |
395 | u32 numqueues = 0; | |
396 | ||
397 | rcu_read_lock(); | |
92bb73ea | 398 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 399 | |
3958afa1 | 400 | txq = skb_get_hash(skb); |
c8d68e6b | 401 | if (txq) { |
96442e42 | 402 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
9bc88939 | 403 | if (e) { |
9bc88939 | 404 | tun_flow_save_rps_rxhash(e, txq); |
fbe4d456 | 405 | txq = e->queue_index; |
9bc88939 | 406 | } else |
96442e42 JW |
407 | /* use multiply and shift instead of expensive divide */ |
408 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
409 | } else if (likely(skb_rx_queue_recorded(skb))) { |
410 | txq = skb_get_rx_queue(skb); | |
411 | while (unlikely(txq >= numqueues)) | |
412 | txq -= numqueues; | |
413 | } | |
414 | ||
415 | rcu_read_unlock(); | |
416 | return txq; | |
417 | } | |
418 | ||
cde8b15f JW |
419 | static inline bool tun_not_capable(struct tun_struct *tun) |
420 | { | |
421 | const struct cred *cred = current_cred(); | |
c260b772 | 422 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
423 | |
424 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
425 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 426 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
427 | } |
428 | ||
c8d68e6b JW |
429 | static void tun_set_real_num_queues(struct tun_struct *tun) |
430 | { | |
431 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
432 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
433 | } | |
434 | ||
4008e97f JW |
435 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
436 | { | |
437 | tfile->detached = tun; | |
438 | list_add_tail(&tfile->next, &tun->disabled); | |
439 | ++tun->numdisabled; | |
440 | } | |
441 | ||
d32649d1 | 442 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
443 | { |
444 | struct tun_struct *tun = tfile->detached; | |
445 | ||
446 | tfile->detached = NULL; | |
447 | list_del_init(&tfile->next); | |
448 | --tun->numdisabled; | |
449 | return tun; | |
450 | } | |
451 | ||
4bfb0513 JW |
452 | static void tun_queue_purge(struct tun_file *tfile) |
453 | { | |
454 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
455 | skb_queue_purge(&tfile->sk.sk_error_queue); | |
456 | } | |
457 | ||
c8d68e6b JW |
458 | static void __tun_detach(struct tun_file *tfile, bool clean) |
459 | { | |
460 | struct tun_file *ntfile; | |
461 | struct tun_struct *tun; | |
c8d68e6b | 462 | |
b8deabd3 JW |
463 | tun = rtnl_dereference(tfile->tun); |
464 | ||
9e85722d | 465 | if (tun && !tfile->detached) { |
c8d68e6b JW |
466 | u16 index = tfile->queue_index; |
467 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
468 | |
469 | rcu_assign_pointer(tun->tfiles[index], | |
470 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 471 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
472 | ntfile->queue_index = index; |
473 | ||
474 | --tun->numqueues; | |
9e85722d | 475 | if (clean) { |
c956674b | 476 | RCU_INIT_POINTER(tfile->tun, NULL); |
4008e97f | 477 | sock_put(&tfile->sk); |
9e85722d | 478 | } else |
4008e97f | 479 | tun_disable_queue(tun, tfile); |
c8d68e6b JW |
480 | |
481 | synchronize_net(); | |
96442e42 | 482 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b | 483 | /* Drop read queue */ |
4bfb0513 | 484 | tun_queue_purge(tfile); |
c8d68e6b | 485 | tun_set_real_num_queues(tun); |
dd38bd85 | 486 | } else if (tfile->detached && clean) { |
4008e97f | 487 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
488 | sock_put(&tfile->sk); |
489 | } | |
c8d68e6b JW |
490 | |
491 | if (clean) { | |
af668b3c MT |
492 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
493 | netif_carrier_off(tun->dev); | |
494 | ||
40630b82 | 495 | if (!(tun->flags & IFF_PERSIST) && |
af668b3c | 496 | tun->dev->reg_state == NETREG_REGISTERED) |
4008e97f | 497 | unregister_netdevice(tun->dev); |
af668b3c | 498 | } |
4008e97f | 499 | |
c8d68e6b JW |
500 | BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED, |
501 | &tfile->socket.flags)); | |
502 | sk_release_kernel(&tfile->sk); | |
503 | } | |
504 | } | |
505 | ||
506 | static void tun_detach(struct tun_file *tfile, bool clean) | |
507 | { | |
508 | rtnl_lock(); | |
509 | __tun_detach(tfile, clean); | |
510 | rtnl_unlock(); | |
511 | } | |
512 | ||
513 | static void tun_detach_all(struct net_device *dev) | |
514 | { | |
515 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 516 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
517 | int i, n = tun->numqueues; |
518 | ||
519 | for (i = 0; i < n; i++) { | |
b8deabd3 | 520 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 521 | BUG_ON(!tfile); |
9e641bdc | 522 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 523 | RCU_INIT_POINTER(tfile->tun, NULL); |
c8d68e6b JW |
524 | --tun->numqueues; |
525 | } | |
9e85722d | 526 | list_for_each_entry(tfile, &tun->disabled, next) { |
9e641bdc | 527 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 528 | RCU_INIT_POINTER(tfile->tun, NULL); |
9e85722d | 529 | } |
c8d68e6b JW |
530 | BUG_ON(tun->numqueues != 0); |
531 | ||
532 | synchronize_net(); | |
533 | for (i = 0; i < n; i++) { | |
b8deabd3 | 534 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 535 | /* Drop read queue */ |
4bfb0513 | 536 | tun_queue_purge(tfile); |
c8d68e6b JW |
537 | sock_put(&tfile->sk); |
538 | } | |
4008e97f JW |
539 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
540 | tun_enable_queue(tfile); | |
4bfb0513 | 541 | tun_queue_purge(tfile); |
4008e97f JW |
542 | sock_put(&tfile->sk); |
543 | } | |
544 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 | 545 | |
40630b82 | 546 | if (tun->flags & IFF_PERSIST) |
dd38bd85 | 547 | module_put(THIS_MODULE); |
c8d68e6b JW |
548 | } |
549 | ||
849c9b6f | 550 | static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filter) |
a7385ba2 | 551 | { |
631ab46b | 552 | struct tun_file *tfile = file->private_data; |
38231b7a | 553 | int err; |
a7385ba2 | 554 | |
5dbbaf2d PM |
555 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
556 | if (err < 0) | |
557 | goto out; | |
558 | ||
38231b7a | 559 | err = -EINVAL; |
9e85722d | 560 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
561 | goto out; |
562 | ||
563 | err = -EBUSY; | |
40630b82 | 564 | if (!(tun->flags & IFF_MULTI_QUEUE) && tun->numqueues == 1) |
c8d68e6b JW |
565 | goto out; |
566 | ||
567 | err = -E2BIG; | |
4008e97f JW |
568 | if (!tfile->detached && |
569 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
570 | goto out; |
571 | ||
572 | err = 0; | |
54f968d6 | 573 | |
92d4ea6e | 574 | /* Re-attach the filter to persist device */ |
849c9b6f | 575 | if (!skip_filter && (tun->filter_attached == true)) { |
54f968d6 JW |
576 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
577 | if (!err) | |
578 | goto out; | |
579 | } | |
c8d68e6b | 580 | tfile->queue_index = tun->numqueues; |
6e914fc7 | 581 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 582 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 583 | tun->numqueues++; |
a7385ba2 | 584 | |
4008e97f JW |
585 | if (tfile->detached) |
586 | tun_enable_queue(tfile); | |
587 | else | |
588 | sock_hold(&tfile->sk); | |
589 | ||
c8d68e6b | 590 | tun_set_real_num_queues(tun); |
a7385ba2 | 591 | |
c8d68e6b JW |
592 | /* device is allowed to go away first, so no need to hold extra |
593 | * refcnt. | |
594 | */ | |
595 | ||
596 | out: | |
597 | return err; | |
631ab46b EB |
598 | } |
599 | ||
600 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
601 | { | |
6e914fc7 | 602 | struct tun_struct *tun; |
c70f1829 | 603 | |
6e914fc7 JW |
604 | rcu_read_lock(); |
605 | tun = rcu_dereference(tfile->tun); | |
606 | if (tun) | |
607 | dev_hold(tun->dev); | |
608 | rcu_read_unlock(); | |
c70f1829 EB |
609 | |
610 | return tun; | |
631ab46b EB |
611 | } |
612 | ||
613 | static struct tun_struct *tun_get(struct file *file) | |
614 | { | |
615 | return __tun_get(file->private_data); | |
616 | } | |
617 | ||
618 | static void tun_put(struct tun_struct *tun) | |
619 | { | |
6e914fc7 | 620 | dev_put(tun->dev); |
631ab46b EB |
621 | } |
622 | ||
6b8a66ee | 623 | /* TAP filtering */ |
f271b2cc MK |
624 | static void addr_hash_set(u32 *mask, const u8 *addr) |
625 | { | |
626 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
627 | mask[n >> 5] |= (1 << (n & 31)); | |
628 | } | |
629 | ||
630 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
631 | { | |
632 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
633 | return mask[n >> 5] & (1 << (n & 31)); | |
634 | } | |
635 | ||
636 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
637 | { | |
638 | struct { u8 u[ETH_ALEN]; } *addr; | |
639 | struct tun_filter uf; | |
640 | int err, alen, n, nexact; | |
641 | ||
642 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
643 | return -EFAULT; | |
644 | ||
645 | if (!uf.count) { | |
646 | /* Disabled */ | |
647 | filter->count = 0; | |
648 | return 0; | |
649 | } | |
650 | ||
651 | alen = ETH_ALEN * uf.count; | |
652 | addr = kmalloc(alen, GFP_KERNEL); | |
653 | if (!addr) | |
654 | return -ENOMEM; | |
655 | ||
656 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
657 | err = -EFAULT; | |
658 | goto done; | |
659 | } | |
660 | ||
661 | /* The filter is updated without holding any locks. Which is | |
662 | * perfectly safe. We disable it first and in the worst | |
663 | * case we'll accept a few undesired packets. */ | |
664 | filter->count = 0; | |
665 | wmb(); | |
666 | ||
667 | /* Use first set of addresses as an exact filter */ | |
668 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
669 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
670 | ||
671 | nexact = n; | |
672 | ||
cfbf84fc AW |
673 | /* Remaining multicast addresses are hashed, |
674 | * unicast will leave the filter disabled. */ | |
f271b2cc | 675 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
676 | for (; n < uf.count; n++) { |
677 | if (!is_multicast_ether_addr(addr[n].u)) { | |
678 | err = 0; /* no filter */ | |
679 | goto done; | |
680 | } | |
f271b2cc | 681 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 682 | } |
f271b2cc MK |
683 | |
684 | /* For ALLMULTI just set the mask to all ones. | |
685 | * This overrides the mask populated above. */ | |
686 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
687 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
688 | ||
689 | /* Now enable the filter */ | |
690 | wmb(); | |
691 | filter->count = nexact; | |
692 | ||
693 | /* Return the number of exact filters */ | |
694 | err = nexact; | |
695 | ||
696 | done: | |
697 | kfree(addr); | |
698 | return err; | |
699 | } | |
700 | ||
701 | /* Returns: 0 - drop, !=0 - accept */ | |
702 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
703 | { | |
704 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
705 | * at this point. */ | |
706 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
707 | int i; | |
708 | ||
709 | /* Exact match */ | |
710 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 711 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
712 | return 1; |
713 | ||
714 | /* Inexact match (multicast only) */ | |
715 | if (is_multicast_ether_addr(eh->h_dest)) | |
716 | return addr_hash_test(filter->mask, eh->h_dest); | |
717 | ||
718 | return 0; | |
719 | } | |
720 | ||
721 | /* | |
722 | * Checks whether the packet is accepted or not. | |
723 | * Returns: 0 - drop, !=0 - accept | |
724 | */ | |
725 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
726 | { | |
727 | if (!filter->count) | |
728 | return 1; | |
729 | ||
730 | return run_filter(filter, skb); | |
731 | } | |
732 | ||
1da177e4 LT |
733 | /* Network device part of the driver */ |
734 | ||
7282d491 | 735 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 736 | |
c70f1829 EB |
737 | /* Net device detach from fd. */ |
738 | static void tun_net_uninit(struct net_device *dev) | |
739 | { | |
c8d68e6b | 740 | tun_detach_all(dev); |
c70f1829 EB |
741 | } |
742 | ||
1da177e4 LT |
743 | /* Net device open. */ |
744 | static int tun_net_open(struct net_device *dev) | |
745 | { | |
c8d68e6b | 746 | netif_tx_start_all_queues(dev); |
1da177e4 LT |
747 | return 0; |
748 | } | |
749 | ||
750 | /* Net device close. */ | |
751 | static int tun_net_close(struct net_device *dev) | |
752 | { | |
c8d68e6b | 753 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
754 | return 0; |
755 | } | |
756 | ||
757 | /* Net device start xmit */ | |
424efe9c | 758 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
759 | { |
760 | struct tun_struct *tun = netdev_priv(dev); | |
c8d68e6b | 761 | int txq = skb->queue_mapping; |
6e914fc7 | 762 | struct tun_file *tfile; |
fa35864e | 763 | u32 numqueues = 0; |
1da177e4 | 764 | |
6e914fc7 | 765 | rcu_read_lock(); |
c8d68e6b | 766 | tfile = rcu_dereference(tun->tfiles[txq]); |
fa35864e | 767 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 768 | |
1da177e4 | 769 | /* Drop packet if interface is not attached */ |
fa35864e | 770 | if (txq >= numqueues) |
1da177e4 LT |
771 | goto drop; |
772 | ||
fa35864e | 773 | if (numqueues == 1) { |
9bc88939 TH |
774 | /* Select queue was not called for the skbuff, so we extract the |
775 | * RPS hash and save it into the flow_table here. | |
776 | */ | |
777 | __u32 rxhash; | |
778 | ||
779 | rxhash = skb_get_hash(skb); | |
780 | if (rxhash) { | |
781 | struct tun_flow_entry *e; | |
782 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], | |
783 | rxhash); | |
784 | if (e) | |
785 | tun_flow_save_rps_rxhash(e, rxhash); | |
786 | } | |
787 | } | |
788 | ||
6e914fc7 JW |
789 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
790 | ||
c8d68e6b JW |
791 | BUG_ON(!tfile); |
792 | ||
f271b2cc MK |
793 | /* Drop if the filter does not like it. |
794 | * This is a noop if the filter is disabled. | |
795 | * Filter can be enabled only for the TAP devices. */ | |
796 | if (!check_filter(&tun->txflt, skb)) | |
797 | goto drop; | |
798 | ||
54f968d6 JW |
799 | if (tfile->socket.sk->sk_filter && |
800 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
801 | goto drop; |
802 | ||
36fe8c09 | 803 | /* Limit the number of packets queued by dividing txq length with the |
c8d68e6b JW |
804 | * number of queues. |
805 | */ | |
fa35864e DC |
806 | if (skb_queue_len(&tfile->socket.sk->sk_receive_queue) * numqueues |
807 | >= dev->tx_queue_len) | |
5d097109 | 808 | goto drop; |
1da177e4 | 809 | |
7bf66305 JW |
810 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
811 | goto drop; | |
812 | ||
eda29772 RC |
813 | if (skb->sk) { |
814 | sock_tx_timestamp(skb->sk, &skb_shinfo(skb)->tx_flags); | |
815 | sw_tx_timestamp(skb); | |
816 | } | |
817 | ||
0110d6f2 | 818 | /* Orphan the skb - required as we might hang on to it |
7bf66305 JW |
819 | * for indefinite time. |
820 | */ | |
0110d6f2 MT |
821 | skb_orphan(skb); |
822 | ||
f8af75f3 ED |
823 | nf_reset(skb); |
824 | ||
f271b2cc | 825 | /* Enqueue packet */ |
54f968d6 | 826 | skb_queue_tail(&tfile->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
827 | |
828 | /* Notify and wake up reader process */ | |
54f968d6 JW |
829 | if (tfile->flags & TUN_FASYNC) |
830 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
9e641bdc | 831 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
6e914fc7 JW |
832 | |
833 | rcu_read_unlock(); | |
6ed10654 | 834 | return NETDEV_TX_OK; |
1da177e4 LT |
835 | |
836 | drop: | |
09f75cd7 | 837 | dev->stats.tx_dropped++; |
149d36f7 | 838 | skb_tx_error(skb); |
1da177e4 | 839 | kfree_skb(skb); |
6e914fc7 | 840 | rcu_read_unlock(); |
baeababb | 841 | return NET_XMIT_DROP; |
1da177e4 LT |
842 | } |
843 | ||
f271b2cc | 844 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 845 | { |
f271b2cc MK |
846 | /* |
847 | * This callback is supposed to deal with mc filter in | |
848 | * _rx_ path and has nothing to do with the _tx_ path. | |
849 | * In rx path we always accept everything userspace gives us. | |
850 | */ | |
1da177e4 LT |
851 | } |
852 | ||
4885a504 ES |
853 | #define MIN_MTU 68 |
854 | #define MAX_MTU 65535 | |
855 | ||
856 | static int | |
857 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
858 | { | |
859 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
860 | return -EINVAL; | |
861 | dev->mtu = new_mtu; | |
862 | return 0; | |
863 | } | |
864 | ||
c8f44aff MM |
865 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
866 | netdev_features_t features) | |
88255375 MM |
867 | { |
868 | struct tun_struct *tun = netdev_priv(dev); | |
869 | ||
870 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
871 | } | |
bebd097a NH |
872 | #ifdef CONFIG_NET_POLL_CONTROLLER |
873 | static void tun_poll_controller(struct net_device *dev) | |
874 | { | |
875 | /* | |
876 | * Tun only receives frames when: | |
877 | * 1) the char device endpoint gets data from user space | |
878 | * 2) the tun socket gets a sendmsg call from user space | |
92d4ea6e | 879 | * Since both of those are synchronous operations, we are guaranteed |
bebd097a | 880 | * never to have pending data when we poll for it |
92d4ea6e | 881 | * so there is nothing to do here but return. |
bebd097a NH |
882 | * We need this though so netpoll recognizes us as an interface that |
883 | * supports polling, which enables bridge devices in virt setups to | |
884 | * still use netconsole | |
885 | */ | |
886 | return; | |
887 | } | |
888 | #endif | |
758e43b7 | 889 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 890 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
891 | .ndo_open = tun_net_open, |
892 | .ndo_stop = tun_net_close, | |
00829823 | 893 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 894 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 895 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 896 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
897 | #ifdef CONFIG_NET_POLL_CONTROLLER |
898 | .ndo_poll_controller = tun_poll_controller, | |
899 | #endif | |
758e43b7 SH |
900 | }; |
901 | ||
902 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 903 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
904 | .ndo_open = tun_net_open, |
905 | .ndo_stop = tun_net_close, | |
00829823 | 906 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 907 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 908 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 909 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
910 | .ndo_set_mac_address = eth_mac_addr, |
911 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 912 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
913 | #ifdef CONFIG_NET_POLL_CONTROLLER |
914 | .ndo_poll_controller = tun_poll_controller, | |
915 | #endif | |
758e43b7 SH |
916 | }; |
917 | ||
944a1376 | 918 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
919 | { |
920 | int i; | |
921 | ||
96442e42 JW |
922 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
923 | INIT_HLIST_HEAD(&tun->flows[i]); | |
924 | ||
925 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
926 | setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); | |
927 | mod_timer(&tun->flow_gc_timer, | |
928 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
929 | } |
930 | ||
931 | static void tun_flow_uninit(struct tun_struct *tun) | |
932 | { | |
933 | del_timer_sync(&tun->flow_gc_timer); | |
934 | tun_flow_flush(tun); | |
96442e42 JW |
935 | } |
936 | ||
1da177e4 LT |
937 | /* Initialize net device. */ |
938 | static void tun_net_init(struct net_device *dev) | |
939 | { | |
940 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 941 | |
1da177e4 | 942 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 | 943 | case IFF_TUN: |
758e43b7 SH |
944 | dev->netdev_ops = &tun_netdev_ops; |
945 | ||
1da177e4 LT |
946 | /* Point-to-Point TUN Device */ |
947 | dev->hard_header_len = 0; | |
948 | dev->addr_len = 0; | |
949 | dev->mtu = 1500; | |
950 | ||
951 | /* Zero header length */ | |
6aa20a22 | 952 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
953 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
954 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
955 | break; | |
956 | ||
40630b82 | 957 | case IFF_TAP: |
7a0a9608 | 958 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 959 | /* Ethernet TAP Device */ |
1da177e4 | 960 | ether_setup(dev); |
550fd08c | 961 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 962 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 963 | |
f2cedb63 | 964 | eth_hw_addr_random(dev); |
36226a8d | 965 | |
1da177e4 LT |
966 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
967 | break; | |
968 | } | |
969 | } | |
970 | ||
971 | /* Character device part */ | |
972 | ||
973 | /* Poll */ | |
c8d68e6b | 974 | static unsigned int tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 975 | { |
b2430de3 EB |
976 | struct tun_file *tfile = file->private_data; |
977 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 978 | struct sock *sk; |
33dccbb0 | 979 | unsigned int mask = 0; |
1da177e4 LT |
980 | |
981 | if (!tun) | |
eac9e902 | 982 | return POLLERR; |
1da177e4 | 983 | |
54f968d6 | 984 | sk = tfile->socket.sk; |
3c8a9c63 | 985 | |
6b8a66ee | 986 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 987 | |
9e641bdc | 988 | poll_wait(file, sk_sleep(sk), wait); |
6aa20a22 | 989 | |
89f56d1e | 990 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
991 | mask |= POLLIN | POLLRDNORM; |
992 | ||
33dccbb0 HX |
993 | if (sock_writeable(sk) || |
994 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
995 | sock_writeable(sk))) | |
996 | mask |= POLLOUT | POLLWRNORM; | |
997 | ||
c70f1829 EB |
998 | if (tun->dev->reg_state != NETREG_REGISTERED) |
999 | mask = POLLERR; | |
1000 | ||
631ab46b | 1001 | tun_put(tun); |
1da177e4 LT |
1002 | return mask; |
1003 | } | |
1004 | ||
f42157cb RR |
1005 | /* prepad is the amount to reserve at front. len is length after that. |
1006 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 1007 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 1008 | size_t prepad, size_t len, |
1009 | size_t linear, int noblock) | |
f42157cb | 1010 | { |
54f968d6 | 1011 | struct sock *sk = tfile->socket.sk; |
f42157cb | 1012 | struct sk_buff *skb; |
33dccbb0 | 1013 | int err; |
f42157cb RR |
1014 | |
1015 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 1016 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 1017 | linear = len; |
f42157cb | 1018 | |
33dccbb0 | 1019 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
28d64271 | 1020 | &err, 0); |
f42157cb | 1021 | if (!skb) |
33dccbb0 | 1022 | return ERR_PTR(err); |
f42157cb RR |
1023 | |
1024 | skb_reserve(skb, prepad); | |
1025 | skb_put(skb, linear); | |
33dccbb0 HX |
1026 | skb->data_len = len - linear; |
1027 | skb->len += len - linear; | |
f42157cb RR |
1028 | |
1029 | return skb; | |
1030 | } | |
1031 | ||
1da177e4 | 1032 | /* Get packet from user space buffer */ |
54f968d6 | 1033 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
f5ff53b4 AV |
1034 | void *msg_control, struct iov_iter *from, |
1035 | int noblock) | |
1da177e4 | 1036 | { |
09640e63 | 1037 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1038 | struct sk_buff *skb; |
f5ff53b4 | 1039 | size_t total_len = iov_iter_count(from); |
3dd5c330 | 1040 | size_t len = total_len, align = NET_SKB_PAD, linear; |
f43798c2 | 1041 | struct virtio_net_hdr gso = { 0 }; |
96f8d9ec | 1042 | int good_linear; |
0690899b MT |
1043 | int copylen; |
1044 | bool zerocopy = false; | |
1045 | int err; | |
49974420 | 1046 | u32 rxhash; |
f5ff53b4 | 1047 | ssize_t n; |
1da177e4 | 1048 | |
40630b82 | 1049 | if (!(tun->flags & IFF_NO_PI)) { |
15718ea0 | 1050 | if (len < sizeof(pi)) |
1da177e4 | 1051 | return -EINVAL; |
15718ea0 | 1052 | len -= sizeof(pi); |
1da177e4 | 1053 | |
f5ff53b4 AV |
1054 | n = copy_from_iter(&pi, sizeof(pi), from); |
1055 | if (n != sizeof(pi)) | |
1da177e4 LT |
1056 | return -EFAULT; |
1057 | } | |
1058 | ||
40630b82 | 1059 | if (tun->flags & IFF_VNET_HDR) { |
15718ea0 | 1060 | if (len < tun->vnet_hdr_sz) |
f43798c2 | 1061 | return -EINVAL; |
15718ea0 | 1062 | len -= tun->vnet_hdr_sz; |
f43798c2 | 1063 | |
f5ff53b4 AV |
1064 | n = copy_from_iter(&gso, sizeof(gso), from); |
1065 | if (n != sizeof(gso)) | |
f43798c2 RR |
1066 | return -EFAULT; |
1067 | ||
4909122f | 1068 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
56f0dcc5 MT |
1069 | tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len)) |
1070 | gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2); | |
4909122f | 1071 | |
56f0dcc5 | 1072 | if (tun16_to_cpu(tun, gso.hdr_len) > len) |
f43798c2 | 1073 | return -EINVAL; |
d8febb77 | 1074 | iov_iter_advance(from, tun->vnet_hdr_sz - sizeof(gso)); |
f43798c2 RR |
1075 | } |
1076 | ||
40630b82 | 1077 | if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) { |
a504b86e | 1078 | align += NET_IP_ALIGN; |
0eca93bc | 1079 | if (unlikely(len < ETH_HLEN || |
56f0dcc5 | 1080 | (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN))) |
e01bf1c8 RR |
1081 | return -EINVAL; |
1082 | } | |
6aa20a22 | 1083 | |
96f8d9ec JW |
1084 | good_linear = SKB_MAX_HEAD(align); |
1085 | ||
88529176 | 1086 | if (msg_control) { |
f5ff53b4 AV |
1087 | struct iov_iter i = *from; |
1088 | ||
88529176 JW |
1089 | /* There are 256 bytes to be copied in skb, so there is |
1090 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1091 | * The rest of the buffer is mapped from userspace. |
1092 | */ | |
56f0dcc5 | 1093 | copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN; |
96f8d9ec JW |
1094 | if (copylen > good_linear) |
1095 | copylen = good_linear; | |
3dd5c330 | 1096 | linear = copylen; |
f5ff53b4 AV |
1097 | iov_iter_advance(&i, copylen); |
1098 | if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) | |
88529176 JW |
1099 | zerocopy = true; |
1100 | } | |
1101 | ||
1102 | if (!zerocopy) { | |
0690899b | 1103 | copylen = len; |
56f0dcc5 | 1104 | if (tun16_to_cpu(tun, gso.hdr_len) > good_linear) |
96f8d9ec JW |
1105 | linear = good_linear; |
1106 | else | |
56f0dcc5 | 1107 | linear = tun16_to_cpu(tun, gso.hdr_len); |
3dd5c330 | 1108 | } |
0690899b | 1109 | |
3dd5c330 | 1110 | skb = tun_alloc_skb(tfile, align, copylen, linear, noblock); |
33dccbb0 HX |
1111 | if (IS_ERR(skb)) { |
1112 | if (PTR_ERR(skb) != -EAGAIN) | |
1113 | tun->dev->stats.rx_dropped++; | |
1114 | return PTR_ERR(skb); | |
1da177e4 LT |
1115 | } |
1116 | ||
0690899b | 1117 | if (zerocopy) |
f5ff53b4 | 1118 | err = zerocopy_sg_from_iter(skb, from); |
88529176 | 1119 | else { |
f5ff53b4 | 1120 | err = skb_copy_datagram_from_iter(skb, 0, from, len); |
88529176 JW |
1121 | if (!err && msg_control) { |
1122 | struct ubuf_info *uarg = msg_control; | |
1123 | uarg->callback(uarg, false); | |
1124 | } | |
1125 | } | |
0690899b MT |
1126 | |
1127 | if (err) { | |
09f75cd7 | 1128 | tun->dev->stats.rx_dropped++; |
8f22757e | 1129 | kfree_skb(skb); |
1da177e4 | 1130 | return -EFAULT; |
8f22757e | 1131 | } |
1da177e4 | 1132 | |
f43798c2 | 1133 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
56f0dcc5 MT |
1134 | if (!skb_partial_csum_set(skb, tun16_to_cpu(tun, gso.csum_start), |
1135 | tun16_to_cpu(tun, gso.csum_offset))) { | |
f43798c2 RR |
1136 | tun->dev->stats.rx_frame_errors++; |
1137 | kfree_skb(skb); | |
1138 | return -EINVAL; | |
1139 | } | |
88255375 | 1140 | } |
f43798c2 | 1141 | |
1da177e4 | 1142 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 MT |
1143 | case IFF_TUN: |
1144 | if (tun->flags & IFF_NO_PI) { | |
f09f7ee2 AWC |
1145 | switch (skb->data[0] & 0xf0) { |
1146 | case 0x40: | |
1147 | pi.proto = htons(ETH_P_IP); | |
1148 | break; | |
1149 | case 0x60: | |
1150 | pi.proto = htons(ETH_P_IPV6); | |
1151 | break; | |
1152 | default: | |
1153 | tun->dev->stats.rx_dropped++; | |
1154 | kfree_skb(skb); | |
1155 | return -EINVAL; | |
1156 | } | |
1157 | } | |
1158 | ||
459a98ed | 1159 | skb_reset_mac_header(skb); |
1da177e4 | 1160 | skb->protocol = pi.proto; |
4c13eb66 | 1161 | skb->dev = tun->dev; |
1da177e4 | 1162 | break; |
40630b82 | 1163 | case IFF_TAP: |
1da177e4 LT |
1164 | skb->protocol = eth_type_trans(skb, tun->dev); |
1165 | break; | |
6403eab1 | 1166 | } |
1da177e4 | 1167 | |
f43798c2 RR |
1168 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
1169 | pr_debug("GSO!\n"); | |
1170 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1171 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
c9af6db4 | 1172 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
f43798c2 RR |
1173 | break; |
1174 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
c9af6db4 | 1175 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
f43798c2 | 1176 | break; |
e36aa25a | 1177 | case VIRTIO_NET_HDR_GSO_UDP: |
c9af6db4 | 1178 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
e36aa25a | 1179 | break; |
f43798c2 RR |
1180 | default: |
1181 | tun->dev->stats.rx_frame_errors++; | |
1182 | kfree_skb(skb); | |
1183 | return -EINVAL; | |
1184 | } | |
1185 | ||
1186 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
c9af6db4 | 1187 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
f43798c2 | 1188 | |
56f0dcc5 | 1189 | skb_shinfo(skb)->gso_size = tun16_to_cpu(tun, gso.gso_size); |
f43798c2 RR |
1190 | if (skb_shinfo(skb)->gso_size == 0) { |
1191 | tun->dev->stats.rx_frame_errors++; | |
1192 | kfree_skb(skb); | |
1193 | return -EINVAL; | |
1194 | } | |
1195 | ||
1196 | /* Header must be checked, and gso_segs computed. */ | |
1197 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1198 | skb_shinfo(skb)->gso_segs = 0; | |
1199 | } | |
6aa20a22 | 1200 | |
0690899b MT |
1201 | /* copy skb_ubuf_info for callback when skb has no error */ |
1202 | if (zerocopy) { | |
1203 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1204 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
c9af6db4 | 1205 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
0690899b MT |
1206 | } |
1207 | ||
72f65107 | 1208 | skb_reset_network_header(skb); |
40893fd0 | 1209 | skb_probe_transport_header(skb, 0); |
38502af7 | 1210 | |
3958afa1 | 1211 | rxhash = skb_get_hash(skb); |
1da177e4 | 1212 | netif_rx_ni(skb); |
6aa20a22 | 1213 | |
09f75cd7 JG |
1214 | tun->dev->stats.rx_packets++; |
1215 | tun->dev->stats.rx_bytes += len; | |
1da177e4 | 1216 | |
9e85722d | 1217 | tun_flow_update(tun, rxhash, tfile); |
0690899b | 1218 | return total_len; |
6aa20a22 | 1219 | } |
1da177e4 | 1220 | |
f5ff53b4 | 1221 | static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 | 1222 | { |
33dccbb0 | 1223 | struct file *file = iocb->ki_filp; |
ab46d779 | 1224 | struct tun_struct *tun = tun_get(file); |
54f968d6 | 1225 | struct tun_file *tfile = file->private_data; |
631ab46b | 1226 | ssize_t result; |
1da177e4 LT |
1227 | |
1228 | if (!tun) | |
1229 | return -EBADFD; | |
1230 | ||
f5ff53b4 | 1231 | result = tun_get_user(tun, tfile, NULL, from, file->f_flags & O_NONBLOCK); |
631ab46b EB |
1232 | |
1233 | tun_put(tun); | |
1234 | return result; | |
1da177e4 LT |
1235 | } |
1236 | ||
1da177e4 | 1237 | /* Put packet to the user space buffer */ |
6f7c156c | 1238 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 1239 | struct tun_file *tfile, |
6f7c156c | 1240 | struct sk_buff *skb, |
e0b46d0e | 1241 | struct iov_iter *iter) |
1da177e4 LT |
1242 | { |
1243 | struct tun_pi pi = { 0, skb->protocol }; | |
e0b46d0e | 1244 | ssize_t total; |
8c847d25 | 1245 | int vlan_offset = 0; |
a8f9bfdf | 1246 | int vlan_hlen = 0; |
2eb783c4 | 1247 | int vnet_hdr_sz = 0; |
a8f9bfdf | 1248 | |
df8a39de | 1249 | if (skb_vlan_tag_present(skb)) |
a8f9bfdf | 1250 | vlan_hlen = VLAN_HLEN; |
1da177e4 | 1251 | |
40630b82 | 1252 | if (tun->flags & IFF_VNET_HDR) |
2eb783c4 | 1253 | vnet_hdr_sz = tun->vnet_hdr_sz; |
1da177e4 | 1254 | |
e0b46d0e HX |
1255 | total = skb->len + vlan_hlen + vnet_hdr_sz; |
1256 | ||
40630b82 | 1257 | if (!(tun->flags & IFF_NO_PI)) { |
e0b46d0e | 1258 | if (iov_iter_count(iter) < sizeof(pi)) |
1da177e4 LT |
1259 | return -EINVAL; |
1260 | ||
e0b46d0e HX |
1261 | total += sizeof(pi); |
1262 | if (iov_iter_count(iter) < total) { | |
1da177e4 LT |
1263 | /* Packet will be striped */ |
1264 | pi.flags |= TUN_PKT_STRIP; | |
1265 | } | |
6aa20a22 | 1266 | |
e0b46d0e | 1267 | if (copy_to_iter(&pi, sizeof(pi), iter) != sizeof(pi)) |
1da177e4 | 1268 | return -EFAULT; |
6aa20a22 | 1269 | } |
1da177e4 | 1270 | |
2eb783c4 | 1271 | if (vnet_hdr_sz) { |
f43798c2 | 1272 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ |
e0b46d0e | 1273 | if (iov_iter_count(iter) < vnet_hdr_sz) |
f43798c2 RR |
1274 | return -EINVAL; |
1275 | ||
1276 | if (skb_is_gso(skb)) { | |
1277 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1278 | ||
1279 | /* This is a hint as to how much should be linear. */ | |
56f0dcc5 MT |
1280 | gso.hdr_len = cpu_to_tun16(tun, skb_headlen(skb)); |
1281 | gso.gso_size = cpu_to_tun16(tun, sinfo->gso_size); | |
f43798c2 RR |
1282 | if (sinfo->gso_type & SKB_GSO_TCPV4) |
1283 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1284 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1285 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e3e3c423 VY |
1286 | else if (sinfo->gso_type & SKB_GSO_UDP) |
1287 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
ef3db4a5 | 1288 | else { |
6b8a66ee | 1289 | pr_err("unexpected GSO type: " |
ef3db4a5 | 1290 | "0x%x, gso_size %d, hdr_len %d\n", |
56f0dcc5 MT |
1291 | sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), |
1292 | tun16_to_cpu(tun, gso.hdr_len)); | |
ef3db4a5 MT |
1293 | print_hex_dump(KERN_ERR, "tun: ", |
1294 | DUMP_PREFIX_NONE, | |
1295 | 16, 1, skb->head, | |
56f0dcc5 | 1296 | min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); |
ef3db4a5 MT |
1297 | WARN_ON_ONCE(1); |
1298 | return -EINVAL; | |
1299 | } | |
f43798c2 RR |
1300 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
1301 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1302 | } else | |
1303 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1304 | ||
1305 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1306 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
56f0dcc5 MT |
1307 | gso.csum_start = cpu_to_tun16(tun, skb_checksum_start_offset(skb) + |
1308 | vlan_hlen); | |
1309 | gso.csum_offset = cpu_to_tun16(tun, skb->csum_offset); | |
10a8d94a JW |
1310 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
1311 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
f43798c2 RR |
1312 | } /* else everything is zero */ |
1313 | ||
e0b46d0e | 1314 | if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) |
f43798c2 | 1315 | return -EFAULT; |
8c847d25 JW |
1316 | |
1317 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); | |
f43798c2 RR |
1318 | } |
1319 | ||
a8f9bfdf | 1320 | if (vlan_hlen) { |
e0b46d0e | 1321 | int ret; |
6680ec68 JW |
1322 | struct { |
1323 | __be16 h_vlan_proto; | |
1324 | __be16 h_vlan_TCI; | |
1325 | } veth; | |
1326 | ||
1327 | veth.h_vlan_proto = skb->vlan_proto; | |
df8a39de | 1328 | veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb)); |
6680ec68 JW |
1329 | |
1330 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
6680ec68 | 1331 | |
e0b46d0e HX |
1332 | ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset); |
1333 | if (ret || !iov_iter_count(iter)) | |
6680ec68 JW |
1334 | goto done; |
1335 | ||
e0b46d0e HX |
1336 | ret = copy_to_iter(&veth, sizeof(veth), iter); |
1337 | if (ret != sizeof(veth) || !iov_iter_count(iter)) | |
6680ec68 JW |
1338 | goto done; |
1339 | } | |
1da177e4 | 1340 | |
e0b46d0e | 1341 | skb_copy_datagram_iter(skb, vlan_offset, iter, skb->len - vlan_offset); |
1da177e4 | 1342 | |
6680ec68 | 1343 | done: |
09f75cd7 | 1344 | tun->dev->stats.tx_packets++; |
e0b46d0e | 1345 | tun->dev->stats.tx_bytes += skb->len + vlan_hlen; |
1da177e4 LT |
1346 | |
1347 | return total; | |
1348 | } | |
1349 | ||
54f968d6 | 1350 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
9b067034 AV |
1351 | struct iov_iter *to, |
1352 | int noblock) | |
1da177e4 | 1353 | { |
1da177e4 | 1354 | struct sk_buff *skb; |
9b067034 | 1355 | ssize_t ret; |
9e641bdc | 1356 | int peeked, err, off = 0; |
1da177e4 | 1357 | |
3872baf6 | 1358 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 1359 | |
9b067034 AV |
1360 | if (!iov_iter_count(to)) |
1361 | return 0; | |
1da177e4 | 1362 | |
9e641bdc XW |
1363 | if (tun->dev->reg_state != NETREG_REGISTERED) |
1364 | return -EIO; | |
1da177e4 | 1365 | |
9e641bdc XW |
1366 | /* Read frames from queue */ |
1367 | skb = __skb_recv_datagram(tfile->socket.sk, noblock ? MSG_DONTWAIT : 0, | |
1368 | &peeked, &off, &err); | |
e0b46d0e | 1369 | if (!skb) |
957f094f | 1370 | return err; |
e0b46d0e | 1371 | |
9b067034 | 1372 | ret = tun_put_user(tun, tfile, skb, to); |
f51a5e82 | 1373 | if (unlikely(ret < 0)) |
f271b2cc | 1374 | kfree_skb(skb); |
f51a5e82 JW |
1375 | else |
1376 | consume_skb(skb); | |
1da177e4 | 1377 | |
05c2828c MT |
1378 | return ret; |
1379 | } | |
1380 | ||
9b067034 | 1381 | static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
05c2828c MT |
1382 | { |
1383 | struct file *file = iocb->ki_filp; | |
1384 | struct tun_file *tfile = file->private_data; | |
1385 | struct tun_struct *tun = __tun_get(tfile); | |
9b067034 | 1386 | ssize_t len = iov_iter_count(to), ret; |
05c2828c MT |
1387 | |
1388 | if (!tun) | |
1389 | return -EBADFD; | |
9b067034 | 1390 | ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK); |
42404c09 | 1391 | ret = min_t(ssize_t, ret, len); |
d0b7da8a ZYW |
1392 | if (ret > 0) |
1393 | iocb->ki_pos = ret; | |
631ab46b | 1394 | tun_put(tun); |
1da177e4 LT |
1395 | return ret; |
1396 | } | |
1397 | ||
96442e42 JW |
1398 | static void tun_free_netdev(struct net_device *dev) |
1399 | { | |
1400 | struct tun_struct *tun = netdev_priv(dev); | |
1401 | ||
4008e97f | 1402 | BUG_ON(!(list_empty(&tun->disabled))); |
96442e42 | 1403 | tun_flow_uninit(tun); |
5dbbaf2d | 1404 | security_tun_dev_free_security(tun->security); |
96442e42 JW |
1405 | free_netdev(dev); |
1406 | } | |
1407 | ||
1da177e4 LT |
1408 | static void tun_setup(struct net_device *dev) |
1409 | { | |
1410 | struct tun_struct *tun = netdev_priv(dev); | |
1411 | ||
0625c883 EB |
1412 | tun->owner = INVALID_UID; |
1413 | tun->group = INVALID_GID; | |
1da177e4 | 1414 | |
1da177e4 | 1415 | dev->ethtool_ops = &tun_ethtool_ops; |
96442e42 | 1416 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
1417 | } |
1418 | ||
f019a7a5 EB |
1419 | /* Trivial set of netlink ops to allow deleting tun or tap |
1420 | * device with netlink. | |
1421 | */ | |
1422 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1423 | { | |
1424 | return -EINVAL; | |
1425 | } | |
1426 | ||
1427 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1428 | .kind = DRV_NAME, | |
1429 | .priv_size = sizeof(struct tun_struct), | |
1430 | .setup = tun_setup, | |
1431 | .validate = tun_validate, | |
1432 | }; | |
1433 | ||
33dccbb0 HX |
1434 | static void tun_sock_write_space(struct sock *sk) |
1435 | { | |
54f968d6 | 1436 | struct tun_file *tfile; |
43815482 | 1437 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1438 | |
1439 | if (!sock_writeable(sk)) | |
1440 | return; | |
1441 | ||
33dccbb0 HX |
1442 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
1443 | return; | |
1444 | ||
43815482 ED |
1445 | wqueue = sk_sleep(sk); |
1446 | if (wqueue && waitqueue_active(wqueue)) | |
1447 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1448 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1449 | |
54f968d6 JW |
1450 | tfile = container_of(sk, struct tun_file, sk); |
1451 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
1452 | } |
1453 | ||
05c2828c MT |
1454 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
1455 | struct msghdr *m, size_t total_len) | |
1456 | { | |
54f968d6 JW |
1457 | int ret; |
1458 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1459 | struct tun_struct *tun = __tun_get(tfile); | |
1460 | ||
1461 | if (!tun) | |
1462 | return -EBADFD; | |
f5ff53b4 | 1463 | |
c0371da6 | 1464 | ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, |
f5ff53b4 | 1465 | m->msg_flags & MSG_DONTWAIT); |
54f968d6 JW |
1466 | tun_put(tun); |
1467 | return ret; | |
05c2828c MT |
1468 | } |
1469 | ||
1470 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1471 | struct msghdr *m, size_t total_len, | |
1472 | int flags) | |
1473 | { | |
54f968d6 JW |
1474 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
1475 | struct tun_struct *tun = __tun_get(tfile); | |
05c2828c | 1476 | int ret; |
54f968d6 JW |
1477 | |
1478 | if (!tun) | |
1479 | return -EBADFD; | |
1480 | ||
eda29772 | 1481 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
3811ae76 G |
1482 | ret = -EINVAL; |
1483 | goto out; | |
1484 | } | |
eda29772 RC |
1485 | if (flags & MSG_ERRQUEUE) { |
1486 | ret = sock_recv_errqueue(sock->sk, m, total_len, | |
1487 | SOL_PACKET, TUN_TX_TIMESTAMP); | |
1488 | goto out; | |
1489 | } | |
c0371da6 | 1490 | ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT); |
87897931 | 1491 | if (ret > (ssize_t)total_len) { |
42404c09 DM |
1492 | m->msg_flags |= MSG_TRUNC; |
1493 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1494 | } | |
3811ae76 | 1495 | out: |
54f968d6 | 1496 | tun_put(tun); |
05c2828c MT |
1497 | return ret; |
1498 | } | |
1499 | ||
1ab5ecb9 SK |
1500 | static int tun_release(struct socket *sock) |
1501 | { | |
1502 | if (sock->sk) | |
1503 | sock_put(sock->sk); | |
1504 | return 0; | |
1505 | } | |
1506 | ||
05c2828c MT |
1507 | /* Ops structure to mimic raw sockets with tun */ |
1508 | static const struct proto_ops tun_socket_ops = { | |
1509 | .sendmsg = tun_sendmsg, | |
1510 | .recvmsg = tun_recvmsg, | |
1ab5ecb9 | 1511 | .release = tun_release, |
05c2828c MT |
1512 | }; |
1513 | ||
33dccbb0 HX |
1514 | static struct proto tun_proto = { |
1515 | .name = "tun", | |
1516 | .owner = THIS_MODULE, | |
54f968d6 | 1517 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 1518 | }; |
f019a7a5 | 1519 | |
980c9e8c DW |
1520 | static int tun_flags(struct tun_struct *tun) |
1521 | { | |
031f5e03 | 1522 | return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP); |
980c9e8c DW |
1523 | } |
1524 | ||
1525 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1526 | char *buf) | |
1527 | { | |
1528 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1529 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1530 | } | |
1531 | ||
1532 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1533 | char *buf) | |
1534 | { | |
1535 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1536 | return uid_valid(tun->owner)? |
1537 | sprintf(buf, "%u\n", | |
1538 | from_kuid_munged(current_user_ns(), tun->owner)): | |
1539 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1540 | } |
1541 | ||
1542 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1543 | char *buf) | |
1544 | { | |
1545 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1546 | return gid_valid(tun->group) ? |
1547 | sprintf(buf, "%u\n", | |
1548 | from_kgid_munged(current_user_ns(), tun->group)): | |
1549 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1550 | } |
1551 | ||
1552 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1553 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1554 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1555 | ||
c4d33e24 TI |
1556 | static struct attribute *tun_dev_attrs[] = { |
1557 | &dev_attr_tun_flags.attr, | |
1558 | &dev_attr_owner.attr, | |
1559 | &dev_attr_group.attr, | |
1560 | NULL | |
1561 | }; | |
1562 | ||
1563 | static const struct attribute_group tun_attr_group = { | |
1564 | .attrs = tun_dev_attrs | |
1565 | }; | |
1566 | ||
d647a591 | 1567 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
1568 | { |
1569 | struct tun_struct *tun; | |
54f968d6 | 1570 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
1571 | struct net_device *dev; |
1572 | int err; | |
1573 | ||
7c0c3b1a JW |
1574 | if (tfile->detached) |
1575 | return -EINVAL; | |
1576 | ||
74a3e5a7 EB |
1577 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1578 | if (dev) { | |
f85ba780 DW |
1579 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1580 | return -EBUSY; | |
74a3e5a7 EB |
1581 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1582 | tun = netdev_priv(dev); | |
1583 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1584 | tun = netdev_priv(dev); | |
1585 | else | |
1586 | return -EINVAL; | |
1587 | ||
8e6d91ae | 1588 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
40630b82 | 1589 | !!(tun->flags & IFF_MULTI_QUEUE)) |
8e6d91ae JW |
1590 | return -EINVAL; |
1591 | ||
cde8b15f | 1592 | if (tun_not_capable(tun)) |
2b980dbd | 1593 | return -EPERM; |
5dbbaf2d | 1594 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
1595 | if (err < 0) |
1596 | return err; | |
1597 | ||
849c9b6f | 1598 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER); |
a7385ba2 EB |
1599 | if (err < 0) |
1600 | return err; | |
4008e97f | 1601 | |
40630b82 | 1602 | if (tun->flags & IFF_MULTI_QUEUE && |
e8dbad66 JW |
1603 | (tun->numqueues + tun->numdisabled > 1)) { |
1604 | /* One or more queue has already been attached, no need | |
1605 | * to initialize the device again. | |
1606 | */ | |
1607 | return 0; | |
1608 | } | |
6aa20a22 | 1609 | } |
1da177e4 LT |
1610 | else { |
1611 | char *name; | |
1612 | unsigned long flags = 0; | |
edfb6a14 JW |
1613 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
1614 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 1615 | |
c260b772 | 1616 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 1617 | return -EPERM; |
2b980dbd PM |
1618 | err = security_tun_dev_create(); |
1619 | if (err < 0) | |
1620 | return err; | |
ca6bb5d7 | 1621 | |
1da177e4 LT |
1622 | /* Set dev type */ |
1623 | if (ifr->ifr_flags & IFF_TUN) { | |
1624 | /* TUN device */ | |
40630b82 | 1625 | flags |= IFF_TUN; |
1da177e4 LT |
1626 | name = "tun%d"; |
1627 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1628 | /* TAP device */ | |
40630b82 | 1629 | flags |= IFF_TAP; |
1da177e4 | 1630 | name = "tap%d"; |
6aa20a22 | 1631 | } else |
36989b90 | 1632 | return -EINVAL; |
6aa20a22 | 1633 | |
1da177e4 LT |
1634 | if (*ifr->ifr_name) |
1635 | name = ifr->ifr_name; | |
1636 | ||
c8d68e6b | 1637 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
c835a677 TG |
1638 | NET_NAME_UNKNOWN, tun_setup, queues, |
1639 | queues); | |
edfb6a14 | 1640 | |
1da177e4 LT |
1641 | if (!dev) |
1642 | return -ENOMEM; | |
1643 | ||
fc54c658 | 1644 | dev_net_set(dev, net); |
f019a7a5 | 1645 | dev->rtnl_link_ops = &tun_link_ops; |
fb7589a1 | 1646 | dev->ifindex = tfile->ifindex; |
c4d33e24 | 1647 | dev->sysfs_groups[0] = &tun_attr_group; |
758e43b7 | 1648 | |
1da177e4 LT |
1649 | tun = netdev_priv(dev); |
1650 | tun->dev = dev; | |
1651 | tun->flags = flags; | |
f271b2cc | 1652 | tun->txflt.count = 0; |
d9d52b51 | 1653 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 1654 | |
54f968d6 JW |
1655 | tun->filter_attached = false; |
1656 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
33dccbb0 | 1657 | |
96442e42 JW |
1658 | spin_lock_init(&tun->lock); |
1659 | ||
5dbbaf2d PM |
1660 | err = security_tun_dev_alloc_security(&tun->security); |
1661 | if (err < 0) | |
1662 | goto err_free_dev; | |
2b980dbd | 1663 | |
1da177e4 | 1664 | tun_net_init(dev); |
944a1376 | 1665 | tun_flow_init(tun); |
96442e42 | 1666 | |
88255375 | 1667 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
6680ec68 JW |
1668 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
1669 | NETIF_F_HW_VLAN_STAG_TX; | |
88255375 | 1670 | dev->features = dev->hw_features; |
6671b224 FLVC |
1671 | dev->vlan_features = dev->features & |
1672 | ~(NETIF_F_HW_VLAN_CTAG_TX | | |
1673 | NETIF_F_HW_VLAN_STAG_TX); | |
88255375 | 1674 | |
4008e97f | 1675 | INIT_LIST_HEAD(&tun->disabled); |
849c9b6f | 1676 | err = tun_attach(tun, file, false); |
eb0fb363 | 1677 | if (err < 0) |
662ca437 | 1678 | goto err_free_flow; |
eb0fb363 | 1679 | |
1da177e4 LT |
1680 | err = register_netdevice(tun->dev); |
1681 | if (err < 0) | |
662ca437 | 1682 | goto err_detach; |
1da177e4 LT |
1683 | } |
1684 | ||
af668b3c MT |
1685 | netif_carrier_on(tun->dev); |
1686 | ||
6b8a66ee | 1687 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 | 1688 | |
031f5e03 MT |
1689 | tun->flags = (tun->flags & ~TUN_FEATURES) | |
1690 | (ifr->ifr_flags & TUN_FEATURES); | |
c8d68e6b | 1691 | |
e35259a9 MK |
1692 | /* Make sure persistent devices do not get stuck in |
1693 | * xoff state. | |
1694 | */ | |
1695 | if (netif_running(tun->dev)) | |
c8d68e6b | 1696 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 1697 | |
1da177e4 LT |
1698 | strcpy(ifr->ifr_name, tun->dev->name); |
1699 | return 0; | |
1700 | ||
662ca437 JW |
1701 | err_detach: |
1702 | tun_detach_all(dev); | |
1703 | err_free_flow: | |
1704 | tun_flow_uninit(tun); | |
1705 | security_tun_dev_free_security(tun->security); | |
1706 | err_free_dev: | |
1da177e4 | 1707 | free_netdev(dev); |
1da177e4 LT |
1708 | return err; |
1709 | } | |
1710 | ||
9ce99cf6 | 1711 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 1712 | struct ifreq *ifr) |
e3b99556 | 1713 | { |
6b8a66ee | 1714 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1715 | |
1716 | strcpy(ifr->ifr_name, tun->dev->name); | |
1717 | ||
980c9e8c | 1718 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 1719 | |
e3b99556 MM |
1720 | } |
1721 | ||
5228ddc9 RR |
1722 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1723 | * privs required. */ | |
88255375 | 1724 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1725 | { |
c8f44aff | 1726 | netdev_features_t features = 0; |
5228ddc9 RR |
1727 | |
1728 | if (arg & TUN_F_CSUM) { | |
88255375 | 1729 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1730 | arg &= ~TUN_F_CSUM; |
1731 | ||
1732 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1733 | if (arg & TUN_F_TSO_ECN) { | |
1734 | features |= NETIF_F_TSO_ECN; | |
1735 | arg &= ~TUN_F_TSO_ECN; | |
1736 | } | |
1737 | if (arg & TUN_F_TSO4) | |
1738 | features |= NETIF_F_TSO; | |
1739 | if (arg & TUN_F_TSO6) | |
1740 | features |= NETIF_F_TSO6; | |
1741 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1742 | } | |
e3e3c423 VY |
1743 | |
1744 | if (arg & TUN_F_UFO) { | |
1745 | features |= NETIF_F_UFO; | |
1746 | arg &= ~TUN_F_UFO; | |
1747 | } | |
5228ddc9 RR |
1748 | } |
1749 | ||
1750 | /* This gives the user a way to test for new features in future by | |
1751 | * trying to set them. */ | |
1752 | if (arg) | |
1753 | return -EINVAL; | |
1754 | ||
88255375 MM |
1755 | tun->set_features = features; |
1756 | netdev_update_features(tun->dev); | |
5228ddc9 RR |
1757 | |
1758 | return 0; | |
1759 | } | |
1760 | ||
c8d68e6b JW |
1761 | static void tun_detach_filter(struct tun_struct *tun, int n) |
1762 | { | |
1763 | int i; | |
1764 | struct tun_file *tfile; | |
1765 | ||
1766 | for (i = 0; i < n; i++) { | |
b8deabd3 | 1767 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1768 | sk_detach_filter(tfile->socket.sk); |
1769 | } | |
1770 | ||
1771 | tun->filter_attached = false; | |
1772 | } | |
1773 | ||
1774 | static int tun_attach_filter(struct tun_struct *tun) | |
1775 | { | |
1776 | int i, ret = 0; | |
1777 | struct tun_file *tfile; | |
1778 | ||
1779 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1780 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1781 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
1782 | if (ret) { | |
1783 | tun_detach_filter(tun, i); | |
1784 | return ret; | |
1785 | } | |
1786 | } | |
1787 | ||
1788 | tun->filter_attached = true; | |
1789 | return ret; | |
1790 | } | |
1791 | ||
1792 | static void tun_set_sndbuf(struct tun_struct *tun) | |
1793 | { | |
1794 | struct tun_file *tfile; | |
1795 | int i; | |
1796 | ||
1797 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1798 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1799 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
1800 | } | |
1801 | } | |
1802 | ||
cde8b15f JW |
1803 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
1804 | { | |
1805 | struct tun_file *tfile = file->private_data; | |
1806 | struct tun_struct *tun; | |
cde8b15f JW |
1807 | int ret = 0; |
1808 | ||
1809 | rtnl_lock(); | |
1810 | ||
1811 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 1812 | tun = tfile->detached; |
5dbbaf2d | 1813 | if (!tun) { |
cde8b15f | 1814 | ret = -EINVAL; |
5dbbaf2d PM |
1815 | goto unlock; |
1816 | } | |
1817 | ret = security_tun_dev_attach_queue(tun->security); | |
1818 | if (ret < 0) | |
1819 | goto unlock; | |
849c9b6f | 1820 | ret = tun_attach(tun, file, false); |
4008e97f | 1821 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 1822 | tun = rtnl_dereference(tfile->tun); |
40630b82 | 1823 | if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached) |
4008e97f JW |
1824 | ret = -EINVAL; |
1825 | else | |
1826 | __tun_detach(tfile, false); | |
1827 | } else | |
cde8b15f JW |
1828 | ret = -EINVAL; |
1829 | ||
5dbbaf2d | 1830 | unlock: |
cde8b15f JW |
1831 | rtnl_unlock(); |
1832 | return ret; | |
1833 | } | |
1834 | ||
50857e2a AB |
1835 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1836 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1837 | { |
36b50bab | 1838 | struct tun_file *tfile = file->private_data; |
631ab46b | 1839 | struct tun_struct *tun; |
1da177e4 LT |
1840 | void __user* argp = (void __user*)arg; |
1841 | struct ifreq ifr; | |
0625c883 EB |
1842 | kuid_t owner; |
1843 | kgid_t group; | |
33dccbb0 | 1844 | int sndbuf; |
d9d52b51 | 1845 | int vnet_hdr_sz; |
fb7589a1 | 1846 | unsigned int ifindex; |
1cf8e410 | 1847 | int le; |
f271b2cc | 1848 | int ret; |
1da177e4 | 1849 | |
cde8b15f | 1850 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) { |
50857e2a | 1851 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 1852 | return -EFAULT; |
8bbb1813 | 1853 | } else { |
a117dacd | 1854 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 1855 | } |
631ab46b EB |
1856 | if (cmd == TUNGETFEATURES) { |
1857 | /* Currently this just means: "what IFF flags are valid?". | |
1858 | * This is needed because we never checked for invalid flags on | |
031f5e03 MT |
1859 | * TUNSETIFF. |
1860 | */ | |
1861 | return put_user(IFF_TUN | IFF_TAP | TUN_FEATURES, | |
631ab46b | 1862 | (unsigned int __user*)argp); |
cde8b15f JW |
1863 | } else if (cmd == TUNSETQUEUE) |
1864 | return tun_set_queue(file, &ifr); | |
631ab46b | 1865 | |
c8d68e6b | 1866 | ret = 0; |
876bfd4d HX |
1867 | rtnl_lock(); |
1868 | ||
36b50bab | 1869 | tun = __tun_get(tfile); |
1da177e4 | 1870 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1871 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1872 | ||
876bfd4d | 1873 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1874 | |
876bfd4d HX |
1875 | if (ret) |
1876 | goto unlock; | |
1da177e4 | 1877 | |
50857e2a | 1878 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1879 | ret = -EFAULT; |
1880 | goto unlock; | |
1da177e4 | 1881 | } |
fb7589a1 PE |
1882 | if (cmd == TUNSETIFINDEX) { |
1883 | ret = -EPERM; | |
1884 | if (tun) | |
1885 | goto unlock; | |
1886 | ||
1887 | ret = -EFAULT; | |
1888 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) | |
1889 | goto unlock; | |
1890 | ||
1891 | ret = 0; | |
1892 | tfile->ifindex = ifindex; | |
1893 | goto unlock; | |
1894 | } | |
1da177e4 | 1895 | |
876bfd4d | 1896 | ret = -EBADFD; |
1da177e4 | 1897 | if (!tun) |
876bfd4d | 1898 | goto unlock; |
1da177e4 | 1899 | |
1e588338 | 1900 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 1901 | |
631ab46b | 1902 | ret = 0; |
1da177e4 | 1903 | switch (cmd) { |
e3b99556 | 1904 | case TUNGETIFF: |
9ce99cf6 | 1905 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1906 | |
3d407a80 PE |
1907 | if (tfile->detached) |
1908 | ifr.ifr_flags |= IFF_DETACH_QUEUE; | |
849c9b6f PE |
1909 | if (!tfile->socket.sk->sk_filter) |
1910 | ifr.ifr_flags |= IFF_NOFILTER; | |
3d407a80 | 1911 | |
50857e2a | 1912 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1913 | ret = -EFAULT; |
e3b99556 MM |
1914 | break; |
1915 | ||
1da177e4 LT |
1916 | case TUNSETNOCSUM: |
1917 | /* Disable/Enable checksum */ | |
1da177e4 | 1918 | |
88255375 MM |
1919 | /* [unimplemented] */ |
1920 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 1921 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
1922 | break; |
1923 | ||
1924 | case TUNSETPERSIST: | |
54f968d6 JW |
1925 | /* Disable/Enable persist mode. Keep an extra reference to the |
1926 | * module to prevent the module being unprobed. | |
1927 | */ | |
40630b82 MT |
1928 | if (arg && !(tun->flags & IFF_PERSIST)) { |
1929 | tun->flags |= IFF_PERSIST; | |
54f968d6 | 1930 | __module_get(THIS_MODULE); |
dd38bd85 | 1931 | } |
40630b82 MT |
1932 | if (!arg && (tun->flags & IFF_PERSIST)) { |
1933 | tun->flags &= ~IFF_PERSIST; | |
54f968d6 JW |
1934 | module_put(THIS_MODULE); |
1935 | } | |
1da177e4 | 1936 | |
6b8a66ee JP |
1937 | tun_debug(KERN_INFO, tun, "persist %s\n", |
1938 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
1939 | break; |
1940 | ||
1941 | case TUNSETOWNER: | |
1942 | /* Set owner of the device */ | |
0625c883 EB |
1943 | owner = make_kuid(current_user_ns(), arg); |
1944 | if (!uid_valid(owner)) { | |
1945 | ret = -EINVAL; | |
1946 | break; | |
1947 | } | |
1948 | tun->owner = owner; | |
1e588338 | 1949 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 1950 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
1951 | break; |
1952 | ||
8c644623 GG |
1953 | case TUNSETGROUP: |
1954 | /* Set group of the device */ | |
0625c883 EB |
1955 | group = make_kgid(current_user_ns(), arg); |
1956 | if (!gid_valid(group)) { | |
1957 | ret = -EINVAL; | |
1958 | break; | |
1959 | } | |
1960 | tun->group = group; | |
1e588338 | 1961 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 1962 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
1963 | break; |
1964 | ||
ff4cc3ac MK |
1965 | case TUNSETLINK: |
1966 | /* Only allow setting the type when the interface is down */ | |
1967 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
1968 | tun_debug(KERN_INFO, tun, |
1969 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 1970 | ret = -EBUSY; |
ff4cc3ac MK |
1971 | } else { |
1972 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
1973 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
1974 | tun->dev->type); | |
48abfe05 | 1975 | ret = 0; |
ff4cc3ac | 1976 | } |
631ab46b | 1977 | break; |
ff4cc3ac | 1978 | |
1da177e4 LT |
1979 | #ifdef TUN_DEBUG |
1980 | case TUNSETDEBUG: | |
1981 | tun->debug = arg; | |
1982 | break; | |
1983 | #endif | |
5228ddc9 | 1984 | case TUNSETOFFLOAD: |
88255375 | 1985 | ret = set_offload(tun, arg); |
631ab46b | 1986 | break; |
5228ddc9 | 1987 | |
f271b2cc MK |
1988 | case TUNSETTXFILTER: |
1989 | /* Can be set only for TAPs */ | |
631ab46b | 1990 | ret = -EINVAL; |
40630b82 | 1991 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
631ab46b | 1992 | break; |
c0e5a8c2 | 1993 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 1994 | break; |
1da177e4 LT |
1995 | |
1996 | case SIOCGIFHWADDR: | |
b595076a | 1997 | /* Get hw address */ |
f271b2cc MK |
1998 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
1999 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 2000 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
2001 | ret = -EFAULT; |
2002 | break; | |
1da177e4 LT |
2003 | |
2004 | case SIOCSIFHWADDR: | |
f271b2cc | 2005 | /* Set hw address */ |
6b8a66ee JP |
2006 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
2007 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 2008 | |
40102371 | 2009 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 2010 | break; |
33dccbb0 HX |
2011 | |
2012 | case TUNGETSNDBUF: | |
54f968d6 | 2013 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
2014 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
2015 | ret = -EFAULT; | |
2016 | break; | |
2017 | ||
2018 | case TUNSETSNDBUF: | |
2019 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
2020 | ret = -EFAULT; | |
2021 | break; | |
2022 | } | |
2023 | ||
c8d68e6b JW |
2024 | tun->sndbuf = sndbuf; |
2025 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
2026 | break; |
2027 | ||
d9d52b51 MT |
2028 | case TUNGETVNETHDRSZ: |
2029 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
2030 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
2031 | ret = -EFAULT; | |
2032 | break; | |
2033 | ||
2034 | case TUNSETVNETHDRSZ: | |
2035 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
2036 | ret = -EFAULT; | |
2037 | break; | |
2038 | } | |
2039 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
2040 | ret = -EINVAL; | |
2041 | break; | |
2042 | } | |
2043 | ||
2044 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
2045 | break; | |
2046 | ||
1cf8e410 MT |
2047 | case TUNGETVNETLE: |
2048 | le = !!(tun->flags & TUN_VNET_LE); | |
2049 | if (put_user(le, (int __user *)argp)) | |
2050 | ret = -EFAULT; | |
2051 | break; | |
2052 | ||
2053 | case TUNSETVNETLE: | |
2054 | if (get_user(le, (int __user *)argp)) { | |
2055 | ret = -EFAULT; | |
2056 | break; | |
2057 | } | |
2058 | if (le) | |
2059 | tun->flags |= TUN_VNET_LE; | |
2060 | else | |
2061 | tun->flags &= ~TUN_VNET_LE; | |
2062 | break; | |
2063 | ||
99405162 MT |
2064 | case TUNATTACHFILTER: |
2065 | /* Can be set only for TAPs */ | |
2066 | ret = -EINVAL; | |
40630b82 | 2067 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 MT |
2068 | break; |
2069 | ret = -EFAULT; | |
54f968d6 | 2070 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
2071 | break; |
2072 | ||
c8d68e6b | 2073 | ret = tun_attach_filter(tun); |
99405162 MT |
2074 | break; |
2075 | ||
2076 | case TUNDETACHFILTER: | |
2077 | /* Can be set only for TAPs */ | |
2078 | ret = -EINVAL; | |
40630b82 | 2079 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 | 2080 | break; |
c8d68e6b JW |
2081 | ret = 0; |
2082 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
2083 | break; |
2084 | ||
76975e9c PE |
2085 | case TUNGETFILTER: |
2086 | ret = -EINVAL; | |
40630b82 | 2087 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
76975e9c PE |
2088 | break; |
2089 | ret = -EFAULT; | |
2090 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) | |
2091 | break; | |
2092 | ret = 0; | |
2093 | break; | |
2094 | ||
1da177e4 | 2095 | default: |
631ab46b EB |
2096 | ret = -EINVAL; |
2097 | break; | |
ee289b64 | 2098 | } |
1da177e4 | 2099 | |
876bfd4d HX |
2100 | unlock: |
2101 | rtnl_unlock(); | |
2102 | if (tun) | |
2103 | tun_put(tun); | |
631ab46b | 2104 | return ret; |
1da177e4 LT |
2105 | } |
2106 | ||
50857e2a AB |
2107 | static long tun_chr_ioctl(struct file *file, |
2108 | unsigned int cmd, unsigned long arg) | |
2109 | { | |
2110 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
2111 | } | |
2112 | ||
2113 | #ifdef CONFIG_COMPAT | |
2114 | static long tun_chr_compat_ioctl(struct file *file, | |
2115 | unsigned int cmd, unsigned long arg) | |
2116 | { | |
2117 | switch (cmd) { | |
2118 | case TUNSETIFF: | |
2119 | case TUNGETIFF: | |
2120 | case TUNSETTXFILTER: | |
2121 | case TUNGETSNDBUF: | |
2122 | case TUNSETSNDBUF: | |
2123 | case SIOCGIFHWADDR: | |
2124 | case SIOCSIFHWADDR: | |
2125 | arg = (unsigned long)compat_ptr(arg); | |
2126 | break; | |
2127 | default: | |
2128 | arg = (compat_ulong_t)arg; | |
2129 | break; | |
2130 | } | |
2131 | ||
2132 | /* | |
2133 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
2134 | * the end of that structure. All fields that are used in this | |
2135 | * driver are compatible though, we don't need to convert the | |
2136 | * contents. | |
2137 | */ | |
2138 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
2139 | } | |
2140 | #endif /* CONFIG_COMPAT */ | |
2141 | ||
1da177e4 LT |
2142 | static int tun_chr_fasync(int fd, struct file *file, int on) |
2143 | { | |
54f968d6 | 2144 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2145 | int ret; |
2146 | ||
54f968d6 | 2147 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 2148 | goto out; |
6aa20a22 | 2149 | |
1da177e4 | 2150 | if (on) { |
e0b93edd | 2151 | __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
54f968d6 | 2152 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 2153 | } else |
54f968d6 | 2154 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
2155 | ret = 0; |
2156 | out: | |
9d319522 | 2157 | return ret; |
1da177e4 LT |
2158 | } |
2159 | ||
2160 | static int tun_chr_open(struct inode *inode, struct file * file) | |
2161 | { | |
631ab46b | 2162 | struct tun_file *tfile; |
deed49fb | 2163 | |
6b8a66ee | 2164 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 2165 | |
54f968d6 JW |
2166 | tfile = (struct tun_file *)sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL, |
2167 | &tun_proto); | |
631ab46b EB |
2168 | if (!tfile) |
2169 | return -ENOMEM; | |
c956674b | 2170 | RCU_INIT_POINTER(tfile->tun, NULL); |
36b50bab | 2171 | tfile->net = get_net(current->nsproxy->net_ns); |
54f968d6 | 2172 | tfile->flags = 0; |
fb7589a1 | 2173 | tfile->ifindex = 0; |
54f968d6 | 2174 | |
54f968d6 | 2175 | init_waitqueue_head(&tfile->wq.wait); |
9e641bdc | 2176 | RCU_INIT_POINTER(tfile->socket.wq, &tfile->wq); |
54f968d6 JW |
2177 | |
2178 | tfile->socket.file = file; | |
2179 | tfile->socket.ops = &tun_socket_ops; | |
2180 | ||
2181 | sock_init_data(&tfile->socket, &tfile->sk); | |
2182 | sk_change_net(&tfile->sk, tfile->net); | |
2183 | ||
2184 | tfile->sk.sk_write_space = tun_sock_write_space; | |
2185 | tfile->sk.sk_sndbuf = INT_MAX; | |
2186 | ||
631ab46b | 2187 | file->private_data = tfile; |
54f968d6 | 2188 | set_bit(SOCK_EXTERNALLY_ALLOCATED, &tfile->socket.flags); |
4008e97f | 2189 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 2190 | |
19a6afb2 JW |
2191 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
2192 | ||
1da177e4 LT |
2193 | return 0; |
2194 | } | |
2195 | ||
2196 | static int tun_chr_close(struct inode *inode, struct file *file) | |
2197 | { | |
631ab46b | 2198 | struct tun_file *tfile = file->private_data; |
54f968d6 | 2199 | struct net *net = tfile->net; |
1da177e4 | 2200 | |
c8d68e6b | 2201 | tun_detach(tfile, true); |
54f968d6 | 2202 | put_net(net); |
1da177e4 LT |
2203 | |
2204 | return 0; | |
2205 | } | |
2206 | ||
93e14b6d | 2207 | #ifdef CONFIG_PROC_FS |
a3816ab0 | 2208 | static void tun_chr_show_fdinfo(struct seq_file *m, struct file *f) |
93e14b6d MY |
2209 | { |
2210 | struct tun_struct *tun; | |
2211 | struct ifreq ifr; | |
2212 | ||
2213 | memset(&ifr, 0, sizeof(ifr)); | |
2214 | ||
2215 | rtnl_lock(); | |
2216 | tun = tun_get(f); | |
2217 | if (tun) | |
2218 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); | |
2219 | rtnl_unlock(); | |
2220 | ||
2221 | if (tun) | |
2222 | tun_put(tun); | |
2223 | ||
a3816ab0 | 2224 | seq_printf(m, "iff:\t%s\n", ifr.ifr_name); |
93e14b6d MY |
2225 | } |
2226 | #endif | |
2227 | ||
d54b1fdb | 2228 | static const struct file_operations tun_fops = { |
6aa20a22 | 2229 | .owner = THIS_MODULE, |
1da177e4 | 2230 | .llseek = no_llseek, |
9b067034 | 2231 | .read = new_sync_read, |
f5ff53b4 | 2232 | .write = new_sync_write, |
9b067034 | 2233 | .read_iter = tun_chr_read_iter, |
f5ff53b4 | 2234 | .write_iter = tun_chr_write_iter, |
1da177e4 | 2235 | .poll = tun_chr_poll, |
50857e2a AB |
2236 | .unlocked_ioctl = tun_chr_ioctl, |
2237 | #ifdef CONFIG_COMPAT | |
2238 | .compat_ioctl = tun_chr_compat_ioctl, | |
2239 | #endif | |
1da177e4 LT |
2240 | .open = tun_chr_open, |
2241 | .release = tun_chr_close, | |
93e14b6d MY |
2242 | .fasync = tun_chr_fasync, |
2243 | #ifdef CONFIG_PROC_FS | |
2244 | .show_fdinfo = tun_chr_show_fdinfo, | |
2245 | #endif | |
1da177e4 LT |
2246 | }; |
2247 | ||
2248 | static struct miscdevice tun_miscdev = { | |
2249 | .minor = TUN_MINOR, | |
2250 | .name = "tun", | |
e454cea2 | 2251 | .nodename = "net/tun", |
1da177e4 | 2252 | .fops = &tun_fops, |
1da177e4 LT |
2253 | }; |
2254 | ||
2255 | /* ethtool interface */ | |
2256 | ||
2257 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
2258 | { | |
2259 | cmd->supported = 0; | |
2260 | cmd->advertising = 0; | |
70739497 | 2261 | ethtool_cmd_speed_set(cmd, SPEED_10); |
1da177e4 LT |
2262 | cmd->duplex = DUPLEX_FULL; |
2263 | cmd->port = PORT_TP; | |
2264 | cmd->phy_address = 0; | |
2265 | cmd->transceiver = XCVR_INTERNAL; | |
2266 | cmd->autoneg = AUTONEG_DISABLE; | |
2267 | cmd->maxtxpkt = 0; | |
2268 | cmd->maxrxpkt = 0; | |
2269 | return 0; | |
2270 | } | |
2271 | ||
2272 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
2273 | { | |
2274 | struct tun_struct *tun = netdev_priv(dev); | |
2275 | ||
33a5ba14 RJ |
2276 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
2277 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
2278 | |
2279 | switch (tun->flags & TUN_TYPE_MASK) { | |
40630b82 | 2280 | case IFF_TUN: |
33a5ba14 | 2281 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 | 2282 | break; |
40630b82 | 2283 | case IFF_TAP: |
33a5ba14 | 2284 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
2285 | break; |
2286 | } | |
2287 | } | |
2288 | ||
2289 | static u32 tun_get_msglevel(struct net_device *dev) | |
2290 | { | |
2291 | #ifdef TUN_DEBUG | |
2292 | struct tun_struct *tun = netdev_priv(dev); | |
2293 | return tun->debug; | |
2294 | #else | |
2295 | return -EOPNOTSUPP; | |
2296 | #endif | |
2297 | } | |
2298 | ||
2299 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
2300 | { | |
2301 | #ifdef TUN_DEBUG | |
2302 | struct tun_struct *tun = netdev_priv(dev); | |
2303 | tun->debug = value; | |
2304 | #endif | |
2305 | } | |
2306 | ||
7282d491 | 2307 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
2308 | .get_settings = tun_get_settings, |
2309 | .get_drvinfo = tun_get_drvinfo, | |
2310 | .get_msglevel = tun_get_msglevel, | |
2311 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 2312 | .get_link = ethtool_op_get_link, |
eda29772 | 2313 | .get_ts_info = ethtool_op_get_ts_info, |
1da177e4 LT |
2314 | }; |
2315 | ||
79d17604 | 2316 | |
1da177e4 LT |
2317 | static int __init tun_init(void) |
2318 | { | |
2319 | int ret = 0; | |
2320 | ||
6b8a66ee JP |
2321 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
2322 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 2323 | |
f019a7a5 | 2324 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 2325 | if (ret) { |
6b8a66ee | 2326 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 2327 | goto err_linkops; |
79d17604 PE |
2328 | } |
2329 | ||
1da177e4 | 2330 | ret = misc_register(&tun_miscdev); |
79d17604 | 2331 | if (ret) { |
6b8a66ee | 2332 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
2333 | goto err_misc; |
2334 | } | |
f019a7a5 | 2335 | return 0; |
79d17604 | 2336 | err_misc: |
f019a7a5 EB |
2337 | rtnl_link_unregister(&tun_link_ops); |
2338 | err_linkops: | |
1da177e4 LT |
2339 | return ret; |
2340 | } | |
2341 | ||
2342 | static void tun_cleanup(void) | |
2343 | { | |
6aa20a22 | 2344 | misc_deregister(&tun_miscdev); |
f019a7a5 | 2345 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
2346 | } |
2347 | ||
05c2828c MT |
2348 | /* Get an underlying socket object from tun file. Returns error unless file is |
2349 | * attached to a device. The returned object works like a packet socket, it | |
2350 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
2351 | * holding a reference to the file for as long as the socket is in use. */ | |
2352 | struct socket *tun_get_socket(struct file *file) | |
2353 | { | |
6e914fc7 | 2354 | struct tun_file *tfile; |
05c2828c MT |
2355 | if (file->f_op != &tun_fops) |
2356 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
2357 | tfile = file->private_data; |
2358 | if (!tfile) | |
05c2828c | 2359 | return ERR_PTR(-EBADFD); |
54f968d6 | 2360 | return &tfile->socket; |
05c2828c MT |
2361 | } |
2362 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
2363 | ||
1da177e4 LT |
2364 | module_init(tun_init); |
2365 | module_exit(tun_cleanup); | |
2366 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
2367 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
2368 | MODULE_LICENSE("GPL"); | |
2369 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 2370 | MODULE_ALIAS("devname:net/tun"); |