Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * TUN - Universal TUN/TAP device driver. | |
3 | * Copyright (C) 1999-2002 Maxim Krasnyansky <maxk@qualcomm.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * $Id: tun.c,v 1.15 2002/03/01 02:44:24 maxk Exp $ | |
16 | */ | |
17 | ||
18 | /* | |
19 | * Changes: | |
20 | * | |
ff4cc3ac MK |
21 | * Mike Kershaw <dragorn@kismetwireless.net> 2005/08/14 |
22 | * Add TUNSETLINK ioctl to set the link encapsulation | |
23 | * | |
1da177e4 | 24 | * Mark Smith <markzzzsmith@yahoo.com.au> |
344dc8ed | 25 | * Use eth_random_addr() for tap MAC address. |
1da177e4 LT |
26 | * |
27 | * Harald Roelle <harald.roelle@ifi.lmu.de> 2004/04/20 | |
28 | * Fixes in packet dropping, queue length setting and queue wakeup. | |
29 | * Increased default tx queue length. | |
30 | * Added ethtool API. | |
31 | * Minor cleanups | |
32 | * | |
33 | * Daniel Podlejski <underley@underley.eu.org> | |
34 | * Modifications for 2.3.99-pre5 kernel. | |
35 | */ | |
36 | ||
6b8a66ee JP |
37 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
38 | ||
1da177e4 LT |
39 | #define DRV_NAME "tun" |
40 | #define DRV_VERSION "1.6" | |
41 | #define DRV_DESCRIPTION "Universal TUN/TAP device driver" | |
42 | #define DRV_COPYRIGHT "(C) 1999-2004 Max Krasnyansky <maxk@qualcomm.com>" | |
43 | ||
1da177e4 LT |
44 | #include <linux/module.h> |
45 | #include <linux/errno.h> | |
46 | #include <linux/kernel.h> | |
47 | #include <linux/major.h> | |
48 | #include <linux/slab.h> | |
49 | #include <linux/poll.h> | |
50 | #include <linux/fcntl.h> | |
51 | #include <linux/init.h> | |
52 | #include <linux/skbuff.h> | |
53 | #include <linux/netdevice.h> | |
54 | #include <linux/etherdevice.h> | |
55 | #include <linux/miscdevice.h> | |
56 | #include <linux/ethtool.h> | |
57 | #include <linux/rtnetlink.h> | |
50857e2a | 58 | #include <linux/compat.h> |
1da177e4 LT |
59 | #include <linux/if.h> |
60 | #include <linux/if_arp.h> | |
61 | #include <linux/if_ether.h> | |
62 | #include <linux/if_tun.h> | |
63 | #include <linux/crc32.h> | |
d647a591 | 64 | #include <linux/nsproxy.h> |
f43798c2 | 65 | #include <linux/virtio_net.h> |
99405162 | 66 | #include <linux/rcupdate.h> |
881d966b | 67 | #include <net/net_namespace.h> |
79d17604 | 68 | #include <net/netns/generic.h> |
f019a7a5 | 69 | #include <net/rtnetlink.h> |
33dccbb0 | 70 | #include <net/sock.h> |
1da177e4 | 71 | |
1da177e4 LT |
72 | #include <asm/uaccess.h> |
73 | ||
14daa021 RR |
74 | /* Uncomment to enable debugging */ |
75 | /* #define TUN_DEBUG 1 */ | |
76 | ||
1da177e4 LT |
77 | #ifdef TUN_DEBUG |
78 | static int debug; | |
14daa021 | 79 | |
6b8a66ee JP |
80 | #define tun_debug(level, tun, fmt, args...) \ |
81 | do { \ | |
82 | if (tun->debug) \ | |
83 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
84 | } while (0) | |
85 | #define DBG1(level, fmt, args...) \ | |
86 | do { \ | |
87 | if (debug == 2) \ | |
88 | printk(level fmt, ##args); \ | |
89 | } while (0) | |
14daa021 | 90 | #else |
6b8a66ee JP |
91 | #define tun_debug(level, tun, fmt, args...) \ |
92 | do { \ | |
93 | if (0) \ | |
94 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
95 | } while (0) | |
96 | #define DBG1(level, fmt, args...) \ | |
97 | do { \ | |
98 | if (0) \ | |
99 | printk(level fmt, ##args); \ | |
100 | } while (0) | |
14daa021 RR |
101 | #endif |
102 | ||
0690899b MT |
103 | #define GOODCOPY_LEN 128 |
104 | ||
f271b2cc MK |
105 | #define FLT_EXACT_COUNT 8 |
106 | struct tap_filter { | |
107 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
108 | u32 mask[2]; /* Mask of the hashed addrs */ | |
109 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
110 | }; | |
111 | ||
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; | |
14daa021 | 188 | }; |
1da177e4 | 189 | |
96442e42 JW |
190 | static inline u32 tun_hashfn(u32 rxhash) |
191 | { | |
192 | return rxhash & 0x3ff; | |
193 | } | |
194 | ||
195 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
196 | { | |
197 | struct tun_flow_entry *e; | |
198 | struct hlist_node *n; | |
199 | ||
200 | hlist_for_each_entry_rcu(e, n, head, hash_link) { | |
201 | if (e->rxhash == rxhash) | |
202 | return e; | |
203 | } | |
204 | return NULL; | |
205 | } | |
206 | ||
207 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
208 | struct hlist_head *head, | |
209 | u32 rxhash, u16 queue_index) | |
210 | { | |
9fdc6bef ED |
211 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
212 | ||
96442e42 JW |
213 | if (e) { |
214 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
215 | rxhash, queue_index); | |
216 | e->updated = jiffies; | |
217 | e->rxhash = rxhash; | |
218 | e->queue_index = queue_index; | |
219 | e->tun = tun; | |
220 | hlist_add_head_rcu(&e->hash_link, head); | |
221 | } | |
222 | return e; | |
223 | } | |
224 | ||
96442e42 JW |
225 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
226 | { | |
227 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
228 | e->rxhash, e->queue_index); | |
229 | hlist_del_rcu(&e->hash_link); | |
9fdc6bef | 230 | kfree_rcu(e, rcu); |
96442e42 JW |
231 | } |
232 | ||
233 | static void tun_flow_flush(struct tun_struct *tun) | |
234 | { | |
235 | int i; | |
236 | ||
237 | spin_lock_bh(&tun->lock); | |
238 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
239 | struct tun_flow_entry *e; | |
240 | struct hlist_node *h, *n; | |
241 | ||
242 | hlist_for_each_entry_safe(e, h, n, &tun->flows[i], hash_link) | |
243 | tun_flow_delete(tun, e); | |
244 | } | |
245 | spin_unlock_bh(&tun->lock); | |
246 | } | |
247 | ||
248 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
249 | { | |
250 | int i; | |
251 | ||
252 | spin_lock_bh(&tun->lock); | |
253 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
254 | struct tun_flow_entry *e; | |
255 | struct hlist_node *h, *n; | |
256 | ||
257 | hlist_for_each_entry_safe(e, h, n, &tun->flows[i], hash_link) { | |
258 | if (e->queue_index == queue_index) | |
259 | tun_flow_delete(tun, e); | |
260 | } | |
261 | } | |
262 | spin_unlock_bh(&tun->lock); | |
263 | } | |
264 | ||
265 | static void tun_flow_cleanup(unsigned long data) | |
266 | { | |
267 | struct tun_struct *tun = (struct tun_struct *)data; | |
268 | unsigned long delay = tun->ageing_time; | |
269 | unsigned long next_timer = jiffies + delay; | |
270 | unsigned long count = 0; | |
271 | int i; | |
272 | ||
273 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
274 | ||
275 | spin_lock_bh(&tun->lock); | |
276 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
277 | struct tun_flow_entry *e; | |
278 | struct hlist_node *h, *n; | |
279 | ||
280 | hlist_for_each_entry_safe(e, h, n, &tun->flows[i], hash_link) { | |
281 | unsigned long this_timer; | |
282 | count++; | |
283 | this_timer = e->updated + delay; | |
284 | if (time_before_eq(this_timer, jiffies)) | |
285 | tun_flow_delete(tun, e); | |
286 | else if (time_before(this_timer, next_timer)) | |
287 | next_timer = this_timer; | |
288 | } | |
289 | } | |
290 | ||
291 | if (count) | |
292 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
293 | spin_unlock_bh(&tun->lock); | |
294 | } | |
295 | ||
49974420 | 296 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
96442e42 JW |
297 | u16 queue_index) |
298 | { | |
299 | struct hlist_head *head; | |
300 | struct tun_flow_entry *e; | |
301 | unsigned long delay = tun->ageing_time; | |
96442e42 JW |
302 | |
303 | if (!rxhash) | |
304 | return; | |
305 | else | |
306 | head = &tun->flows[tun_hashfn(rxhash)]; | |
307 | ||
308 | rcu_read_lock(); | |
309 | ||
310 | if (tun->numqueues == 1) | |
311 | goto unlock; | |
312 | ||
313 | e = tun_flow_find(head, rxhash); | |
314 | if (likely(e)) { | |
315 | /* TODO: keep queueing to old queue until it's empty? */ | |
316 | e->queue_index = queue_index; | |
317 | e->updated = jiffies; | |
318 | } else { | |
319 | spin_lock_bh(&tun->lock); | |
320 | if (!tun_flow_find(head, rxhash)) | |
321 | tun_flow_create(tun, head, rxhash, queue_index); | |
322 | ||
323 | if (!timer_pending(&tun->flow_gc_timer)) | |
324 | mod_timer(&tun->flow_gc_timer, | |
325 | round_jiffies_up(jiffies + delay)); | |
326 | spin_unlock_bh(&tun->lock); | |
327 | } | |
328 | ||
329 | unlock: | |
330 | rcu_read_unlock(); | |
331 | } | |
332 | ||
c8d68e6b JW |
333 | /* We try to identify a flow through its rxhash first. The reason that |
334 | * we do not check rxq no. is becuase some cards(e.g 82599), chooses | |
335 | * the rxq based on the txq where the last packet of the flow comes. As | |
336 | * the userspace application move between processors, we may get a | |
337 | * different rxq no. here. If we could not get rxhash, then we would | |
338 | * hope the rxq no. may help here. | |
339 | */ | |
340 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb) | |
341 | { | |
342 | struct tun_struct *tun = netdev_priv(dev); | |
96442e42 | 343 | struct tun_flow_entry *e; |
c8d68e6b JW |
344 | u32 txq = 0; |
345 | u32 numqueues = 0; | |
346 | ||
347 | rcu_read_lock(); | |
348 | numqueues = tun->numqueues; | |
349 | ||
350 | txq = skb_get_rxhash(skb); | |
351 | if (txq) { | |
96442e42 JW |
352 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
353 | if (e) | |
354 | txq = e->queue_index; | |
355 | else | |
356 | /* use multiply and shift instead of expensive divide */ | |
357 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
358 | } else if (likely(skb_rx_queue_recorded(skb))) { |
359 | txq = skb_get_rx_queue(skb); | |
360 | while (unlikely(txq >= numqueues)) | |
361 | txq -= numqueues; | |
362 | } | |
363 | ||
364 | rcu_read_unlock(); | |
365 | return txq; | |
366 | } | |
367 | ||
cde8b15f JW |
368 | static inline bool tun_not_capable(struct tun_struct *tun) |
369 | { | |
370 | const struct cred *cred = current_cred(); | |
c260b772 | 371 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
372 | |
373 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
374 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 375 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
376 | } |
377 | ||
c8d68e6b JW |
378 | static void tun_set_real_num_queues(struct tun_struct *tun) |
379 | { | |
380 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
381 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
382 | } | |
383 | ||
4008e97f JW |
384 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
385 | { | |
386 | tfile->detached = tun; | |
387 | list_add_tail(&tfile->next, &tun->disabled); | |
388 | ++tun->numdisabled; | |
389 | } | |
390 | ||
d32649d1 | 391 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
392 | { |
393 | struct tun_struct *tun = tfile->detached; | |
394 | ||
395 | tfile->detached = NULL; | |
396 | list_del_init(&tfile->next); | |
397 | --tun->numdisabled; | |
398 | return tun; | |
399 | } | |
400 | ||
c8d68e6b JW |
401 | static void __tun_detach(struct tun_file *tfile, bool clean) |
402 | { | |
403 | struct tun_file *ntfile; | |
404 | struct tun_struct *tun; | |
405 | struct net_device *dev; | |
406 | ||
b8deabd3 JW |
407 | tun = rtnl_dereference(tfile->tun); |
408 | ||
c8d68e6b JW |
409 | if (tun) { |
410 | u16 index = tfile->queue_index; | |
411 | BUG_ON(index >= tun->numqueues); | |
412 | dev = tun->dev; | |
413 | ||
414 | rcu_assign_pointer(tun->tfiles[index], | |
415 | tun->tfiles[tun->numqueues - 1]); | |
416 | rcu_assign_pointer(tfile->tun, NULL); | |
b8deabd3 | 417 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
418 | ntfile->queue_index = index; |
419 | ||
420 | --tun->numqueues; | |
4008e97f JW |
421 | if (clean) |
422 | sock_put(&tfile->sk); | |
423 | else | |
424 | tun_disable_queue(tun, tfile); | |
c8d68e6b JW |
425 | |
426 | synchronize_net(); | |
96442e42 | 427 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b JW |
428 | /* Drop read queue */ |
429 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
430 | tun_set_real_num_queues(tun); | |
4008e97f JW |
431 | } else if (tfile->detached && clean) |
432 | tun = tun_enable_queue(tfile); | |
c8d68e6b JW |
433 | |
434 | if (clean) { | |
4008e97f JW |
435 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0 && |
436 | !(tun->flags & TUN_PERSIST)) | |
437 | if (tun->dev->reg_state == NETREG_REGISTERED) | |
438 | unregister_netdevice(tun->dev); | |
439 | ||
c8d68e6b JW |
440 | BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED, |
441 | &tfile->socket.flags)); | |
442 | sk_release_kernel(&tfile->sk); | |
443 | } | |
444 | } | |
445 | ||
446 | static void tun_detach(struct tun_file *tfile, bool clean) | |
447 | { | |
448 | rtnl_lock(); | |
449 | __tun_detach(tfile, clean); | |
450 | rtnl_unlock(); | |
451 | } | |
452 | ||
453 | static void tun_detach_all(struct net_device *dev) | |
454 | { | |
455 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 456 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
457 | int i, n = tun->numqueues; |
458 | ||
459 | for (i = 0; i < n; i++) { | |
b8deabd3 | 460 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
461 | BUG_ON(!tfile); |
462 | wake_up_all(&tfile->wq.wait); | |
463 | rcu_assign_pointer(tfile->tun, NULL); | |
464 | --tun->numqueues; | |
465 | } | |
466 | BUG_ON(tun->numqueues != 0); | |
467 | ||
468 | synchronize_net(); | |
469 | for (i = 0; i < n; i++) { | |
b8deabd3 | 470 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
471 | /* Drop read queue */ |
472 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
473 | sock_put(&tfile->sk); | |
474 | } | |
4008e97f JW |
475 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
476 | tun_enable_queue(tfile); | |
477 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
478 | sock_put(&tfile->sk); | |
479 | } | |
480 | BUG_ON(tun->numdisabled != 0); | |
c8d68e6b JW |
481 | } |
482 | ||
a7385ba2 EB |
483 | static int tun_attach(struct tun_struct *tun, struct file *file) |
484 | { | |
631ab46b | 485 | struct tun_file *tfile = file->private_data; |
38231b7a | 486 | int err; |
a7385ba2 | 487 | |
38231b7a | 488 | err = -EINVAL; |
b8deabd3 | 489 | if (rtnl_dereference(tfile->tun)) |
38231b7a EB |
490 | goto out; |
491 | ||
492 | err = -EBUSY; | |
c8d68e6b JW |
493 | if (!(tun->flags & TUN_TAP_MQ) && tun->numqueues == 1) |
494 | goto out; | |
495 | ||
496 | err = -E2BIG; | |
4008e97f JW |
497 | if (!tfile->detached && |
498 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
499 | goto out; |
500 | ||
501 | err = 0; | |
54f968d6 | 502 | |
c8d68e6b | 503 | /* Re-attach the filter to presist device */ |
54f968d6 JW |
504 | if (tun->filter_attached == true) { |
505 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
506 | if (!err) | |
507 | goto out; | |
508 | } | |
c8d68e6b | 509 | tfile->queue_index = tun->numqueues; |
6e914fc7 | 510 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 511 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 512 | tun->numqueues++; |
a7385ba2 | 513 | |
4008e97f JW |
514 | if (tfile->detached) |
515 | tun_enable_queue(tfile); | |
516 | else | |
517 | sock_hold(&tfile->sk); | |
518 | ||
c8d68e6b | 519 | tun_set_real_num_queues(tun); |
a7385ba2 | 520 | |
c8d68e6b JW |
521 | /* device is allowed to go away first, so no need to hold extra |
522 | * refcnt. | |
523 | */ | |
524 | ||
525 | out: | |
526 | return err; | |
631ab46b EB |
527 | } |
528 | ||
529 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
530 | { | |
6e914fc7 | 531 | struct tun_struct *tun; |
c70f1829 | 532 | |
6e914fc7 JW |
533 | rcu_read_lock(); |
534 | tun = rcu_dereference(tfile->tun); | |
535 | if (tun) | |
536 | dev_hold(tun->dev); | |
537 | rcu_read_unlock(); | |
c70f1829 EB |
538 | |
539 | return tun; | |
631ab46b EB |
540 | } |
541 | ||
542 | static struct tun_struct *tun_get(struct file *file) | |
543 | { | |
544 | return __tun_get(file->private_data); | |
545 | } | |
546 | ||
547 | static void tun_put(struct tun_struct *tun) | |
548 | { | |
6e914fc7 | 549 | dev_put(tun->dev); |
631ab46b EB |
550 | } |
551 | ||
6b8a66ee | 552 | /* TAP filtering */ |
f271b2cc MK |
553 | static void addr_hash_set(u32 *mask, const u8 *addr) |
554 | { | |
555 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
556 | mask[n >> 5] |= (1 << (n & 31)); | |
557 | } | |
558 | ||
559 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
560 | { | |
561 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
562 | return mask[n >> 5] & (1 << (n & 31)); | |
563 | } | |
564 | ||
565 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
566 | { | |
567 | struct { u8 u[ETH_ALEN]; } *addr; | |
568 | struct tun_filter uf; | |
569 | int err, alen, n, nexact; | |
570 | ||
571 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
572 | return -EFAULT; | |
573 | ||
574 | if (!uf.count) { | |
575 | /* Disabled */ | |
576 | filter->count = 0; | |
577 | return 0; | |
578 | } | |
579 | ||
580 | alen = ETH_ALEN * uf.count; | |
581 | addr = kmalloc(alen, GFP_KERNEL); | |
582 | if (!addr) | |
583 | return -ENOMEM; | |
584 | ||
585 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
586 | err = -EFAULT; | |
587 | goto done; | |
588 | } | |
589 | ||
590 | /* The filter is updated without holding any locks. Which is | |
591 | * perfectly safe. We disable it first and in the worst | |
592 | * case we'll accept a few undesired packets. */ | |
593 | filter->count = 0; | |
594 | wmb(); | |
595 | ||
596 | /* Use first set of addresses as an exact filter */ | |
597 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
598 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
599 | ||
600 | nexact = n; | |
601 | ||
cfbf84fc AW |
602 | /* Remaining multicast addresses are hashed, |
603 | * unicast will leave the filter disabled. */ | |
f271b2cc | 604 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
605 | for (; n < uf.count; n++) { |
606 | if (!is_multicast_ether_addr(addr[n].u)) { | |
607 | err = 0; /* no filter */ | |
608 | goto done; | |
609 | } | |
f271b2cc | 610 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 611 | } |
f271b2cc MK |
612 | |
613 | /* For ALLMULTI just set the mask to all ones. | |
614 | * This overrides the mask populated above. */ | |
615 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
616 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
617 | ||
618 | /* Now enable the filter */ | |
619 | wmb(); | |
620 | filter->count = nexact; | |
621 | ||
622 | /* Return the number of exact filters */ | |
623 | err = nexact; | |
624 | ||
625 | done: | |
626 | kfree(addr); | |
627 | return err; | |
628 | } | |
629 | ||
630 | /* Returns: 0 - drop, !=0 - accept */ | |
631 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
632 | { | |
633 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
634 | * at this point. */ | |
635 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
636 | int i; | |
637 | ||
638 | /* Exact match */ | |
639 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 640 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
641 | return 1; |
642 | ||
643 | /* Inexact match (multicast only) */ | |
644 | if (is_multicast_ether_addr(eh->h_dest)) | |
645 | return addr_hash_test(filter->mask, eh->h_dest); | |
646 | ||
647 | return 0; | |
648 | } | |
649 | ||
650 | /* | |
651 | * Checks whether the packet is accepted or not. | |
652 | * Returns: 0 - drop, !=0 - accept | |
653 | */ | |
654 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
655 | { | |
656 | if (!filter->count) | |
657 | return 1; | |
658 | ||
659 | return run_filter(filter, skb); | |
660 | } | |
661 | ||
1da177e4 LT |
662 | /* Network device part of the driver */ |
663 | ||
7282d491 | 664 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 665 | |
c70f1829 EB |
666 | /* Net device detach from fd. */ |
667 | static void tun_net_uninit(struct net_device *dev) | |
668 | { | |
c8d68e6b | 669 | tun_detach_all(dev); |
c70f1829 EB |
670 | } |
671 | ||
1da177e4 LT |
672 | /* Net device open. */ |
673 | static int tun_net_open(struct net_device *dev) | |
674 | { | |
c8d68e6b | 675 | netif_tx_start_all_queues(dev); |
1da177e4 LT |
676 | return 0; |
677 | } | |
678 | ||
679 | /* Net device close. */ | |
680 | static int tun_net_close(struct net_device *dev) | |
681 | { | |
c8d68e6b | 682 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
683 | return 0; |
684 | } | |
685 | ||
686 | /* Net device start xmit */ | |
424efe9c | 687 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
688 | { |
689 | struct tun_struct *tun = netdev_priv(dev); | |
c8d68e6b | 690 | int txq = skb->queue_mapping; |
6e914fc7 | 691 | struct tun_file *tfile; |
1da177e4 | 692 | |
6e914fc7 | 693 | rcu_read_lock(); |
c8d68e6b JW |
694 | tfile = rcu_dereference(tun->tfiles[txq]); |
695 | ||
1da177e4 | 696 | /* Drop packet if interface is not attached */ |
c8d68e6b | 697 | if (txq >= tun->numqueues) |
1da177e4 LT |
698 | goto drop; |
699 | ||
6e914fc7 JW |
700 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
701 | ||
c8d68e6b JW |
702 | BUG_ON(!tfile); |
703 | ||
f271b2cc MK |
704 | /* Drop if the filter does not like it. |
705 | * This is a noop if the filter is disabled. | |
706 | * Filter can be enabled only for the TAP devices. */ | |
707 | if (!check_filter(&tun->txflt, skb)) | |
708 | goto drop; | |
709 | ||
54f968d6 JW |
710 | if (tfile->socket.sk->sk_filter && |
711 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
712 | goto drop; |
713 | ||
36fe8c09 | 714 | /* Limit the number of packets queued by dividing txq length with the |
c8d68e6b JW |
715 | * number of queues. |
716 | */ | |
54f968d6 | 717 | if (skb_queue_len(&tfile->socket.sk->sk_receive_queue) |
5d097109 MT |
718 | >= dev->tx_queue_len / tun->numqueues) |
719 | goto drop; | |
1da177e4 | 720 | |
0110d6f2 MT |
721 | /* Orphan the skb - required as we might hang on to it |
722 | * for indefinite time. */ | |
868eefeb MT |
723 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
724 | goto drop; | |
0110d6f2 MT |
725 | skb_orphan(skb); |
726 | ||
f271b2cc | 727 | /* Enqueue packet */ |
54f968d6 | 728 | skb_queue_tail(&tfile->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
729 | |
730 | /* Notify and wake up reader process */ | |
54f968d6 JW |
731 | if (tfile->flags & TUN_FASYNC) |
732 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
733 | wake_up_interruptible_poll(&tfile->wq.wait, POLLIN | | |
05c2828c | 734 | POLLRDNORM | POLLRDBAND); |
6e914fc7 JW |
735 | |
736 | rcu_read_unlock(); | |
6ed10654 | 737 | return NETDEV_TX_OK; |
1da177e4 LT |
738 | |
739 | drop: | |
09f75cd7 | 740 | dev->stats.tx_dropped++; |
149d36f7 | 741 | skb_tx_error(skb); |
1da177e4 | 742 | kfree_skb(skb); |
6e914fc7 | 743 | rcu_read_unlock(); |
6ed10654 | 744 | return NETDEV_TX_OK; |
1da177e4 LT |
745 | } |
746 | ||
f271b2cc | 747 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 748 | { |
f271b2cc MK |
749 | /* |
750 | * This callback is supposed to deal with mc filter in | |
751 | * _rx_ path and has nothing to do with the _tx_ path. | |
752 | * In rx path we always accept everything userspace gives us. | |
753 | */ | |
1da177e4 LT |
754 | } |
755 | ||
4885a504 ES |
756 | #define MIN_MTU 68 |
757 | #define MAX_MTU 65535 | |
758 | ||
759 | static int | |
760 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
761 | { | |
762 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
763 | return -EINVAL; | |
764 | dev->mtu = new_mtu; | |
765 | return 0; | |
766 | } | |
767 | ||
c8f44aff MM |
768 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
769 | netdev_features_t features) | |
88255375 MM |
770 | { |
771 | struct tun_struct *tun = netdev_priv(dev); | |
772 | ||
773 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
774 | } | |
bebd097a NH |
775 | #ifdef CONFIG_NET_POLL_CONTROLLER |
776 | static void tun_poll_controller(struct net_device *dev) | |
777 | { | |
778 | /* | |
779 | * Tun only receives frames when: | |
780 | * 1) the char device endpoint gets data from user space | |
781 | * 2) the tun socket gets a sendmsg call from user space | |
782 | * Since both of those are syncronous operations, we are guaranteed | |
783 | * never to have pending data when we poll for it | |
784 | * so theres nothing to do here but return. | |
785 | * We need this though so netpoll recognizes us as an interface that | |
786 | * supports polling, which enables bridge devices in virt setups to | |
787 | * still use netconsole | |
788 | */ | |
789 | return; | |
790 | } | |
791 | #endif | |
758e43b7 | 792 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 793 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
794 | .ndo_open = tun_net_open, |
795 | .ndo_stop = tun_net_close, | |
00829823 | 796 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 797 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 798 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 799 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
800 | #ifdef CONFIG_NET_POLL_CONTROLLER |
801 | .ndo_poll_controller = tun_poll_controller, | |
802 | #endif | |
758e43b7 SH |
803 | }; |
804 | ||
805 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 806 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
807 | .ndo_open = tun_net_open, |
808 | .ndo_stop = tun_net_close, | |
00829823 | 809 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 810 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 811 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 812 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
813 | .ndo_set_mac_address = eth_mac_addr, |
814 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 815 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
816 | #ifdef CONFIG_NET_POLL_CONTROLLER |
817 | .ndo_poll_controller = tun_poll_controller, | |
818 | #endif | |
758e43b7 SH |
819 | }; |
820 | ||
96442e42 JW |
821 | static int tun_flow_init(struct tun_struct *tun) |
822 | { | |
823 | int i; | |
824 | ||
96442e42 JW |
825 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
826 | INIT_HLIST_HEAD(&tun->flows[i]); | |
827 | ||
828 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
829 | setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); | |
830 | mod_timer(&tun->flow_gc_timer, | |
831 | round_jiffies_up(jiffies + tun->ageing_time)); | |
832 | ||
833 | return 0; | |
834 | } | |
835 | ||
836 | static void tun_flow_uninit(struct tun_struct *tun) | |
837 | { | |
838 | del_timer_sync(&tun->flow_gc_timer); | |
839 | tun_flow_flush(tun); | |
96442e42 JW |
840 | } |
841 | ||
1da177e4 LT |
842 | /* Initialize net device. */ |
843 | static void tun_net_init(struct net_device *dev) | |
844 | { | |
845 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 846 | |
1da177e4 LT |
847 | switch (tun->flags & TUN_TYPE_MASK) { |
848 | case TUN_TUN_DEV: | |
758e43b7 SH |
849 | dev->netdev_ops = &tun_netdev_ops; |
850 | ||
1da177e4 LT |
851 | /* Point-to-Point TUN Device */ |
852 | dev->hard_header_len = 0; | |
853 | dev->addr_len = 0; | |
854 | dev->mtu = 1500; | |
855 | ||
856 | /* Zero header length */ | |
6aa20a22 | 857 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
858 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
859 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
860 | break; | |
861 | ||
862 | case TUN_TAP_DEV: | |
7a0a9608 | 863 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 864 | /* Ethernet TAP Device */ |
1da177e4 | 865 | ether_setup(dev); |
550fd08c | 866 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 867 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 868 | |
f2cedb63 | 869 | eth_hw_addr_random(dev); |
36226a8d | 870 | |
1da177e4 LT |
871 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
872 | break; | |
873 | } | |
874 | } | |
875 | ||
876 | /* Character device part */ | |
877 | ||
878 | /* Poll */ | |
c8d68e6b | 879 | static unsigned int tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 880 | { |
b2430de3 EB |
881 | struct tun_file *tfile = file->private_data; |
882 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 883 | struct sock *sk; |
33dccbb0 | 884 | unsigned int mask = 0; |
1da177e4 LT |
885 | |
886 | if (!tun) | |
eac9e902 | 887 | return POLLERR; |
1da177e4 | 888 | |
54f968d6 | 889 | sk = tfile->socket.sk; |
3c8a9c63 | 890 | |
6b8a66ee | 891 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 892 | |
54f968d6 | 893 | poll_wait(file, &tfile->wq.wait, wait); |
6aa20a22 | 894 | |
89f56d1e | 895 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
896 | mask |= POLLIN | POLLRDNORM; |
897 | ||
33dccbb0 HX |
898 | if (sock_writeable(sk) || |
899 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
900 | sock_writeable(sk))) | |
901 | mask |= POLLOUT | POLLWRNORM; | |
902 | ||
c70f1829 EB |
903 | if (tun->dev->reg_state != NETREG_REGISTERED) |
904 | mask = POLLERR; | |
905 | ||
631ab46b | 906 | tun_put(tun); |
1da177e4 LT |
907 | return mask; |
908 | } | |
909 | ||
f42157cb RR |
910 | /* prepad is the amount to reserve at front. len is length after that. |
911 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 912 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 913 | size_t prepad, size_t len, |
914 | size_t linear, int noblock) | |
f42157cb | 915 | { |
54f968d6 | 916 | struct sock *sk = tfile->socket.sk; |
f42157cb | 917 | struct sk_buff *skb; |
33dccbb0 | 918 | int err; |
f42157cb RR |
919 | |
920 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 921 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 922 | linear = len; |
f42157cb | 923 | |
33dccbb0 HX |
924 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
925 | &err); | |
f42157cb | 926 | if (!skb) |
33dccbb0 | 927 | return ERR_PTR(err); |
f42157cb RR |
928 | |
929 | skb_reserve(skb, prepad); | |
930 | skb_put(skb, linear); | |
33dccbb0 HX |
931 | skb->data_len = len - linear; |
932 | skb->len += len - linear; | |
f42157cb RR |
933 | |
934 | return skb; | |
935 | } | |
936 | ||
0690899b MT |
937 | /* set skb frags from iovec, this can move to core network code for reuse */ |
938 | static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from, | |
939 | int offset, size_t count) | |
940 | { | |
941 | int len = iov_length(from, count) - offset; | |
942 | int copy = skb_headlen(skb); | |
943 | int size, offset1 = 0; | |
944 | int i = 0; | |
945 | ||
946 | /* Skip over from offset */ | |
947 | while (count && (offset >= from->iov_len)) { | |
948 | offset -= from->iov_len; | |
949 | ++from; | |
950 | --count; | |
951 | } | |
952 | ||
953 | /* copy up to skb headlen */ | |
954 | while (count && (copy > 0)) { | |
955 | size = min_t(unsigned int, copy, from->iov_len - offset); | |
956 | if (copy_from_user(skb->data + offset1, from->iov_base + offset, | |
957 | size)) | |
958 | return -EFAULT; | |
959 | if (copy > size) { | |
960 | ++from; | |
961 | --count; | |
962 | offset = 0; | |
963 | } else | |
964 | offset += size; | |
965 | copy -= size; | |
966 | offset1 += size; | |
967 | } | |
968 | ||
969 | if (len == offset1) | |
970 | return 0; | |
971 | ||
972 | while (count--) { | |
973 | struct page *page[MAX_SKB_FRAGS]; | |
974 | int num_pages; | |
975 | unsigned long base; | |
976 | unsigned long truesize; | |
977 | ||
978 | len = from->iov_len - offset; | |
979 | if (!len) { | |
980 | offset = 0; | |
981 | ++from; | |
982 | continue; | |
983 | } | |
984 | base = (unsigned long)from->iov_base + offset; | |
985 | size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT; | |
986 | if (i + size > MAX_SKB_FRAGS) | |
987 | return -EMSGSIZE; | |
988 | num_pages = get_user_pages_fast(base, size, 0, &page[i]); | |
989 | if (num_pages != size) { | |
990 | for (i = 0; i < num_pages; i++) | |
991 | put_page(page[i]); | |
992 | return -EFAULT; | |
993 | } | |
994 | truesize = size * PAGE_SIZE; | |
995 | skb->data_len += len; | |
996 | skb->len += len; | |
997 | skb->truesize += truesize; | |
998 | atomic_add(truesize, &skb->sk->sk_wmem_alloc); | |
999 | while (len) { | |
1000 | int off = base & ~PAGE_MASK; | |
1001 | int size = min_t(int, len, PAGE_SIZE - off); | |
1002 | __skb_fill_page_desc(skb, i, page[i], off, size); | |
1003 | skb_shinfo(skb)->nr_frags++; | |
1004 | /* increase sk_wmem_alloc */ | |
1005 | base += size; | |
1006 | len -= size; | |
1007 | i++; | |
1008 | } | |
1009 | offset = 0; | |
1010 | ++from; | |
1011 | } | |
1012 | return 0; | |
1013 | } | |
1014 | ||
1da177e4 | 1015 | /* Get packet from user space buffer */ |
54f968d6 JW |
1016 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
1017 | void *msg_control, const struct iovec *iv, | |
1018 | size_t total_len, size_t count, int noblock) | |
1da177e4 | 1019 | { |
09640e63 | 1020 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1021 | struct sk_buff *skb; |
0690899b | 1022 | size_t len = total_len, align = NET_SKB_PAD; |
f43798c2 | 1023 | struct virtio_net_hdr gso = { 0 }; |
6f26c9a7 | 1024 | int offset = 0; |
0690899b MT |
1025 | int copylen; |
1026 | bool zerocopy = false; | |
1027 | int err; | |
49974420 | 1028 | u32 rxhash; |
1da177e4 LT |
1029 | |
1030 | if (!(tun->flags & TUN_NO_PI)) { | |
0690899b | 1031 | if ((len -= sizeof(pi)) > total_len) |
1da177e4 LT |
1032 | return -EINVAL; |
1033 | ||
6f26c9a7 | 1034 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 1035 | return -EFAULT; |
6f26c9a7 | 1036 | offset += sizeof(pi); |
1da177e4 LT |
1037 | } |
1038 | ||
f43798c2 | 1039 | if (tun->flags & TUN_VNET_HDR) { |
0690899b | 1040 | if ((len -= tun->vnet_hdr_sz) > total_len) |
f43798c2 RR |
1041 | return -EINVAL; |
1042 | ||
6f26c9a7 | 1043 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
1044 | return -EFAULT; |
1045 | ||
4909122f HX |
1046 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
1047 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
1048 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
1049 | ||
f43798c2 RR |
1050 | if (gso.hdr_len > len) |
1051 | return -EINVAL; | |
d9d52b51 | 1052 | offset += tun->vnet_hdr_sz; |
f43798c2 RR |
1053 | } |
1054 | ||
e01bf1c8 | 1055 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
a504b86e | 1056 | align += NET_IP_ALIGN; |
0eca93bc HX |
1057 | if (unlikely(len < ETH_HLEN || |
1058 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
1059 | return -EINVAL; |
1060 | } | |
6aa20a22 | 1061 | |
0690899b MT |
1062 | if (msg_control) |
1063 | zerocopy = true; | |
1064 | ||
1065 | if (zerocopy) { | |
1066 | /* Userspace may produce vectors with count greater than | |
1067 | * MAX_SKB_FRAGS, so we need to linearize parts of the skb | |
1068 | * to let the rest of data to be fit in the frags. | |
1069 | */ | |
1070 | if (count > MAX_SKB_FRAGS) { | |
1071 | copylen = iov_length(iv, count - MAX_SKB_FRAGS); | |
1072 | if (copylen < offset) | |
1073 | copylen = 0; | |
1074 | else | |
1075 | copylen -= offset; | |
1076 | } else | |
1077 | copylen = 0; | |
1078 | /* There are 256 bytes to be copied in skb, so there is enough | |
1079 | * room for skb expand head in case it is used. | |
1080 | * The rest of the buffer is mapped from userspace. | |
1081 | */ | |
1082 | if (copylen < gso.hdr_len) | |
1083 | copylen = gso.hdr_len; | |
1084 | if (!copylen) | |
1085 | copylen = GOODCOPY_LEN; | |
1086 | } else | |
1087 | copylen = len; | |
1088 | ||
54f968d6 | 1089 | skb = tun_alloc_skb(tfile, align, copylen, gso.hdr_len, noblock); |
33dccbb0 HX |
1090 | if (IS_ERR(skb)) { |
1091 | if (PTR_ERR(skb) != -EAGAIN) | |
1092 | tun->dev->stats.rx_dropped++; | |
1093 | return PTR_ERR(skb); | |
1da177e4 LT |
1094 | } |
1095 | ||
0690899b MT |
1096 | if (zerocopy) |
1097 | err = zerocopy_sg_from_iovec(skb, iv, offset, count); | |
1098 | else | |
1099 | err = skb_copy_datagram_from_iovec(skb, 0, iv, offset, len); | |
1100 | ||
1101 | if (err) { | |
09f75cd7 | 1102 | tun->dev->stats.rx_dropped++; |
8f22757e | 1103 | kfree_skb(skb); |
1da177e4 | 1104 | return -EFAULT; |
8f22757e | 1105 | } |
1da177e4 | 1106 | |
f43798c2 RR |
1107 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
1108 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
1109 | gso.csum_offset)) { | |
1110 | tun->dev->stats.rx_frame_errors++; | |
1111 | kfree_skb(skb); | |
1112 | return -EINVAL; | |
1113 | } | |
88255375 | 1114 | } |
f43798c2 | 1115 | |
1da177e4 LT |
1116 | switch (tun->flags & TUN_TYPE_MASK) { |
1117 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
1118 | if (tun->flags & TUN_NO_PI) { |
1119 | switch (skb->data[0] & 0xf0) { | |
1120 | case 0x40: | |
1121 | pi.proto = htons(ETH_P_IP); | |
1122 | break; | |
1123 | case 0x60: | |
1124 | pi.proto = htons(ETH_P_IPV6); | |
1125 | break; | |
1126 | default: | |
1127 | tun->dev->stats.rx_dropped++; | |
1128 | kfree_skb(skb); | |
1129 | return -EINVAL; | |
1130 | } | |
1131 | } | |
1132 | ||
459a98ed | 1133 | skb_reset_mac_header(skb); |
1da177e4 | 1134 | skb->protocol = pi.proto; |
4c13eb66 | 1135 | skb->dev = tun->dev; |
1da177e4 LT |
1136 | break; |
1137 | case TUN_TAP_DEV: | |
1138 | skb->protocol = eth_type_trans(skb, tun->dev); | |
1139 | break; | |
6403eab1 | 1140 | } |
1da177e4 | 1141 | |
f43798c2 RR |
1142 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
1143 | pr_debug("GSO!\n"); | |
1144 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1145 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
1146 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; | |
1147 | break; | |
1148 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
1149 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; | |
1150 | break; | |
e36aa25a SS |
1151 | case VIRTIO_NET_HDR_GSO_UDP: |
1152 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; | |
1153 | break; | |
f43798c2 RR |
1154 | default: |
1155 | tun->dev->stats.rx_frame_errors++; | |
1156 | kfree_skb(skb); | |
1157 | return -EINVAL; | |
1158 | } | |
1159 | ||
1160 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
1161 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; | |
1162 | ||
1163 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
1164 | if (skb_shinfo(skb)->gso_size == 0) { | |
1165 | tun->dev->stats.rx_frame_errors++; | |
1166 | kfree_skb(skb); | |
1167 | return -EINVAL; | |
1168 | } | |
1169 | ||
1170 | /* Header must be checked, and gso_segs computed. */ | |
1171 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1172 | skb_shinfo(skb)->gso_segs = 0; | |
1173 | } | |
6aa20a22 | 1174 | |
0690899b MT |
1175 | /* copy skb_ubuf_info for callback when skb has no error */ |
1176 | if (zerocopy) { | |
1177 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1178 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
1179 | } | |
1180 | ||
76fe4581 | 1181 | skb_reset_network_header(skb); |
49974420 | 1182 | rxhash = skb_get_rxhash(skb); |
1da177e4 | 1183 | netif_rx_ni(skb); |
6aa20a22 | 1184 | |
09f75cd7 JG |
1185 | tun->dev->stats.rx_packets++; |
1186 | tun->dev->stats.rx_bytes += len; | |
1da177e4 | 1187 | |
49974420 | 1188 | tun_flow_update(tun, rxhash, tfile->queue_index); |
0690899b | 1189 | return total_len; |
6aa20a22 | 1190 | } |
1da177e4 | 1191 | |
ee0b3e67 BP |
1192 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
1193 | unsigned long count, loff_t pos) | |
1da177e4 | 1194 | { |
33dccbb0 | 1195 | struct file *file = iocb->ki_filp; |
ab46d779 | 1196 | struct tun_struct *tun = tun_get(file); |
54f968d6 | 1197 | struct tun_file *tfile = file->private_data; |
631ab46b | 1198 | ssize_t result; |
1da177e4 LT |
1199 | |
1200 | if (!tun) | |
1201 | return -EBADFD; | |
1202 | ||
6b8a66ee | 1203 | tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count); |
1da177e4 | 1204 | |
54f968d6 JW |
1205 | result = tun_get_user(tun, tfile, NULL, iv, iov_length(iv, count), |
1206 | count, file->f_flags & O_NONBLOCK); | |
631ab46b EB |
1207 | |
1208 | tun_put(tun); | |
1209 | return result; | |
1da177e4 LT |
1210 | } |
1211 | ||
1da177e4 | 1212 | /* Put packet to the user space buffer */ |
6f7c156c | 1213 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 1214 | struct tun_file *tfile, |
6f7c156c | 1215 | struct sk_buff *skb, |
1216 | const struct iovec *iv, int len) | |
1da177e4 LT |
1217 | { |
1218 | struct tun_pi pi = { 0, skb->protocol }; | |
1219 | ssize_t total = 0; | |
1220 | ||
1221 | if (!(tun->flags & TUN_NO_PI)) { | |
1222 | if ((len -= sizeof(pi)) < 0) | |
1223 | return -EINVAL; | |
1224 | ||
1225 | if (len < skb->len) { | |
1226 | /* Packet will be striped */ | |
1227 | pi.flags |= TUN_PKT_STRIP; | |
1228 | } | |
6aa20a22 | 1229 | |
43b39dcd | 1230 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
1231 | return -EFAULT; |
1232 | total += sizeof(pi); | |
6aa20a22 | 1233 | } |
1da177e4 | 1234 | |
f43798c2 RR |
1235 | if (tun->flags & TUN_VNET_HDR) { |
1236 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
d9d52b51 | 1237 | if ((len -= tun->vnet_hdr_sz) < 0) |
f43798c2 RR |
1238 | return -EINVAL; |
1239 | ||
1240 | if (skb_is_gso(skb)) { | |
1241 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1242 | ||
1243 | /* This is a hint as to how much should be linear. */ | |
1244 | gso.hdr_len = skb_headlen(skb); | |
1245 | gso.gso_size = sinfo->gso_size; | |
1246 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1247 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1248 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1249 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e36aa25a SS |
1250 | else if (sinfo->gso_type & SKB_GSO_UDP) |
1251 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
ef3db4a5 | 1252 | else { |
6b8a66ee | 1253 | pr_err("unexpected GSO type: " |
ef3db4a5 MT |
1254 | "0x%x, gso_size %d, hdr_len %d\n", |
1255 | sinfo->gso_type, gso.gso_size, | |
1256 | gso.hdr_len); | |
1257 | print_hex_dump(KERN_ERR, "tun: ", | |
1258 | DUMP_PREFIX_NONE, | |
1259 | 16, 1, skb->head, | |
1260 | min((int)gso.hdr_len, 64), true); | |
1261 | WARN_ON_ONCE(1); | |
1262 | return -EINVAL; | |
1263 | } | |
f43798c2 RR |
1264 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
1265 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1266 | } else | |
1267 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1268 | ||
1269 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1270 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 1271 | gso.csum_start = skb_checksum_start_offset(skb); |
f43798c2 | 1272 | gso.csum_offset = skb->csum_offset; |
10a8d94a JW |
1273 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
1274 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
f43798c2 RR |
1275 | } /* else everything is zero */ |
1276 | ||
43b39dcd MT |
1277 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
1278 | sizeof(gso)))) | |
f43798c2 | 1279 | return -EFAULT; |
d9d52b51 | 1280 | total += tun->vnet_hdr_sz; |
f43798c2 RR |
1281 | } |
1282 | ||
1da177e4 LT |
1283 | len = min_t(int, skb->len, len); |
1284 | ||
43b39dcd | 1285 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
05c2828c | 1286 | total += skb->len; |
1da177e4 | 1287 | |
09f75cd7 JG |
1288 | tun->dev->stats.tx_packets++; |
1289 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
1290 | |
1291 | return total; | |
1292 | } | |
1293 | ||
54f968d6 | 1294 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
05c2828c MT |
1295 | struct kiocb *iocb, const struct iovec *iv, |
1296 | ssize_t len, int noblock) | |
1da177e4 | 1297 | { |
1da177e4 LT |
1298 | DECLARE_WAITQUEUE(wait, current); |
1299 | struct sk_buff *skb; | |
05c2828c | 1300 | ssize_t ret = 0; |
1da177e4 | 1301 | |
3872baf6 | 1302 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 1303 | |
61a5ff15 | 1304 | if (unlikely(!noblock)) |
54f968d6 | 1305 | add_wait_queue(&tfile->wq.wait, &wait); |
1da177e4 | 1306 | while (len) { |
1da177e4 LT |
1307 | current->state = TASK_INTERRUPTIBLE; |
1308 | ||
1309 | /* Read frames from the queue */ | |
54f968d6 | 1310 | if (!(skb = skb_dequeue(&tfile->socket.sk->sk_receive_queue))) { |
05c2828c | 1311 | if (noblock) { |
1da177e4 LT |
1312 | ret = -EAGAIN; |
1313 | break; | |
1314 | } | |
1315 | if (signal_pending(current)) { | |
1316 | ret = -ERESTARTSYS; | |
1317 | break; | |
1318 | } | |
c70f1829 EB |
1319 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
1320 | ret = -EIO; | |
1321 | break; | |
1322 | } | |
1da177e4 LT |
1323 | |
1324 | /* Nothing to read, let's sleep */ | |
1325 | schedule(); | |
1326 | continue; | |
1327 | } | |
1da177e4 | 1328 | |
54f968d6 | 1329 | ret = tun_put_user(tun, tfile, skb, iv, len); |
f271b2cc MK |
1330 | kfree_skb(skb); |
1331 | break; | |
1da177e4 LT |
1332 | } |
1333 | ||
1334 | current->state = TASK_RUNNING; | |
61a5ff15 | 1335 | if (unlikely(!noblock)) |
54f968d6 | 1336 | remove_wait_queue(&tfile->wq.wait, &wait); |
1da177e4 | 1337 | |
05c2828c MT |
1338 | return ret; |
1339 | } | |
1340 | ||
1341 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
1342 | unsigned long count, loff_t pos) | |
1343 | { | |
1344 | struct file *file = iocb->ki_filp; | |
1345 | struct tun_file *tfile = file->private_data; | |
1346 | struct tun_struct *tun = __tun_get(tfile); | |
1347 | ssize_t len, ret; | |
1348 | ||
1349 | if (!tun) | |
1350 | return -EBADFD; | |
1351 | len = iov_length(iv, count); | |
1352 | if (len < 0) { | |
1353 | ret = -EINVAL; | |
1354 | goto out; | |
1355 | } | |
1356 | ||
54f968d6 JW |
1357 | ret = tun_do_read(tun, tfile, iocb, iv, len, |
1358 | file->f_flags & O_NONBLOCK); | |
05c2828c | 1359 | ret = min_t(ssize_t, ret, len); |
631ab46b EB |
1360 | out: |
1361 | tun_put(tun); | |
1da177e4 LT |
1362 | return ret; |
1363 | } | |
1364 | ||
96442e42 JW |
1365 | static void tun_free_netdev(struct net_device *dev) |
1366 | { | |
1367 | struct tun_struct *tun = netdev_priv(dev); | |
1368 | ||
4008e97f | 1369 | BUG_ON(!(list_empty(&tun->disabled))); |
96442e42 JW |
1370 | tun_flow_uninit(tun); |
1371 | free_netdev(dev); | |
1372 | } | |
1373 | ||
1da177e4 LT |
1374 | static void tun_setup(struct net_device *dev) |
1375 | { | |
1376 | struct tun_struct *tun = netdev_priv(dev); | |
1377 | ||
0625c883 EB |
1378 | tun->owner = INVALID_UID; |
1379 | tun->group = INVALID_GID; | |
1da177e4 | 1380 | |
1da177e4 | 1381 | dev->ethtool_ops = &tun_ethtool_ops; |
96442e42 | 1382 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
1383 | } |
1384 | ||
f019a7a5 EB |
1385 | /* Trivial set of netlink ops to allow deleting tun or tap |
1386 | * device with netlink. | |
1387 | */ | |
1388 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1389 | { | |
1390 | return -EINVAL; | |
1391 | } | |
1392 | ||
1393 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1394 | .kind = DRV_NAME, | |
1395 | .priv_size = sizeof(struct tun_struct), | |
1396 | .setup = tun_setup, | |
1397 | .validate = tun_validate, | |
1398 | }; | |
1399 | ||
33dccbb0 HX |
1400 | static void tun_sock_write_space(struct sock *sk) |
1401 | { | |
54f968d6 | 1402 | struct tun_file *tfile; |
43815482 | 1403 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1404 | |
1405 | if (!sock_writeable(sk)) | |
1406 | return; | |
1407 | ||
33dccbb0 HX |
1408 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
1409 | return; | |
1410 | ||
43815482 ED |
1411 | wqueue = sk_sleep(sk); |
1412 | if (wqueue && waitqueue_active(wqueue)) | |
1413 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1414 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1415 | |
54f968d6 JW |
1416 | tfile = container_of(sk, struct tun_file, sk); |
1417 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
1418 | } |
1419 | ||
05c2828c MT |
1420 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
1421 | struct msghdr *m, size_t total_len) | |
1422 | { | |
54f968d6 JW |
1423 | int ret; |
1424 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1425 | struct tun_struct *tun = __tun_get(tfile); | |
1426 | ||
1427 | if (!tun) | |
1428 | return -EBADFD; | |
54f968d6 JW |
1429 | ret = tun_get_user(tun, tfile, m->msg_control, m->msg_iov, total_len, |
1430 | m->msg_iovlen, m->msg_flags & MSG_DONTWAIT); | |
1431 | tun_put(tun); | |
1432 | return ret; | |
05c2828c MT |
1433 | } |
1434 | ||
54f968d6 | 1435 | |
05c2828c MT |
1436 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, |
1437 | struct msghdr *m, size_t total_len, | |
1438 | int flags) | |
1439 | { | |
54f968d6 JW |
1440 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
1441 | struct tun_struct *tun = __tun_get(tfile); | |
05c2828c | 1442 | int ret; |
54f968d6 JW |
1443 | |
1444 | if (!tun) | |
1445 | return -EBADFD; | |
1446 | ||
05c2828c MT |
1447 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) |
1448 | return -EINVAL; | |
54f968d6 | 1449 | ret = tun_do_read(tun, tfile, iocb, m->msg_iov, total_len, |
05c2828c MT |
1450 | flags & MSG_DONTWAIT); |
1451 | if (ret > total_len) { | |
1452 | m->msg_flags |= MSG_TRUNC; | |
1453 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1454 | } | |
54f968d6 | 1455 | tun_put(tun); |
05c2828c MT |
1456 | return ret; |
1457 | } | |
1458 | ||
1ab5ecb9 SK |
1459 | static int tun_release(struct socket *sock) |
1460 | { | |
1461 | if (sock->sk) | |
1462 | sock_put(sock->sk); | |
1463 | return 0; | |
1464 | } | |
1465 | ||
05c2828c MT |
1466 | /* Ops structure to mimic raw sockets with tun */ |
1467 | static const struct proto_ops tun_socket_ops = { | |
1468 | .sendmsg = tun_sendmsg, | |
1469 | .recvmsg = tun_recvmsg, | |
1ab5ecb9 | 1470 | .release = tun_release, |
05c2828c MT |
1471 | }; |
1472 | ||
33dccbb0 HX |
1473 | static struct proto tun_proto = { |
1474 | .name = "tun", | |
1475 | .owner = THIS_MODULE, | |
54f968d6 | 1476 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 1477 | }; |
f019a7a5 | 1478 | |
980c9e8c DW |
1479 | static int tun_flags(struct tun_struct *tun) |
1480 | { | |
1481 | int flags = 0; | |
1482 | ||
1483 | if (tun->flags & TUN_TUN_DEV) | |
1484 | flags |= IFF_TUN; | |
1485 | else | |
1486 | flags |= IFF_TAP; | |
1487 | ||
1488 | if (tun->flags & TUN_NO_PI) | |
1489 | flags |= IFF_NO_PI; | |
1490 | ||
5d097109 MT |
1491 | /* This flag has no real effect. We track the value for backwards |
1492 | * compatibility. | |
1493 | */ | |
980c9e8c DW |
1494 | if (tun->flags & TUN_ONE_QUEUE) |
1495 | flags |= IFF_ONE_QUEUE; | |
1496 | ||
1497 | if (tun->flags & TUN_VNET_HDR) | |
1498 | flags |= IFF_VNET_HDR; | |
1499 | ||
c8d68e6b JW |
1500 | if (tun->flags & TUN_TAP_MQ) |
1501 | flags |= IFF_MULTI_QUEUE; | |
1502 | ||
980c9e8c DW |
1503 | return flags; |
1504 | } | |
1505 | ||
1506 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1507 | char *buf) | |
1508 | { | |
1509 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1510 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1511 | } | |
1512 | ||
1513 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1514 | char *buf) | |
1515 | { | |
1516 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1517 | return uid_valid(tun->owner)? |
1518 | sprintf(buf, "%u\n", | |
1519 | from_kuid_munged(current_user_ns(), tun->owner)): | |
1520 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1521 | } |
1522 | ||
1523 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1524 | char *buf) | |
1525 | { | |
1526 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1527 | return gid_valid(tun->group) ? |
1528 | sprintf(buf, "%u\n", | |
1529 | from_kgid_munged(current_user_ns(), tun->group)): | |
1530 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1531 | } |
1532 | ||
1533 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1534 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1535 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1536 | ||
d647a591 | 1537 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
1538 | { |
1539 | struct tun_struct *tun; | |
54f968d6 | 1540 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
1541 | struct net_device *dev; |
1542 | int err; | |
1543 | ||
7c0c3b1a JW |
1544 | if (tfile->detached) |
1545 | return -EINVAL; | |
1546 | ||
74a3e5a7 EB |
1547 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1548 | if (dev) { | |
f85ba780 DW |
1549 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1550 | return -EBUSY; | |
74a3e5a7 EB |
1551 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1552 | tun = netdev_priv(dev); | |
1553 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1554 | tun = netdev_priv(dev); | |
1555 | else | |
1556 | return -EINVAL; | |
1557 | ||
cde8b15f | 1558 | if (tun_not_capable(tun)) |
2b980dbd | 1559 | return -EPERM; |
54f968d6 | 1560 | err = security_tun_dev_attach(tfile->socket.sk); |
2b980dbd PM |
1561 | if (err < 0) |
1562 | return err; | |
1563 | ||
a7385ba2 EB |
1564 | err = tun_attach(tun, file); |
1565 | if (err < 0) | |
1566 | return err; | |
4008e97f JW |
1567 | |
1568 | if (tun->flags & TUN_TAP_MQ && | |
1569 | (tun->numqueues + tun->numdisabled > 1)) | |
1570 | return err; | |
6aa20a22 | 1571 | } |
1da177e4 LT |
1572 | else { |
1573 | char *name; | |
1574 | unsigned long flags = 0; | |
1575 | ||
c260b772 | 1576 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 1577 | return -EPERM; |
2b980dbd PM |
1578 | err = security_tun_dev_create(); |
1579 | if (err < 0) | |
1580 | return err; | |
ca6bb5d7 | 1581 | |
1da177e4 LT |
1582 | /* Set dev type */ |
1583 | if (ifr->ifr_flags & IFF_TUN) { | |
1584 | /* TUN device */ | |
1585 | flags |= TUN_TUN_DEV; | |
1586 | name = "tun%d"; | |
1587 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1588 | /* TAP device */ | |
1589 | flags |= TUN_TAP_DEV; | |
1590 | name = "tap%d"; | |
6aa20a22 | 1591 | } else |
36989b90 | 1592 | return -EINVAL; |
6aa20a22 | 1593 | |
1da177e4 LT |
1594 | if (*ifr->ifr_name) |
1595 | name = ifr->ifr_name; | |
1596 | ||
c8d68e6b JW |
1597 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
1598 | tun_setup, | |
1599 | MAX_TAP_QUEUES, MAX_TAP_QUEUES); | |
1da177e4 LT |
1600 | if (!dev) |
1601 | return -ENOMEM; | |
1602 | ||
fc54c658 | 1603 | dev_net_set(dev, net); |
f019a7a5 | 1604 | dev->rtnl_link_ops = &tun_link_ops; |
758e43b7 | 1605 | |
1da177e4 LT |
1606 | tun = netdev_priv(dev); |
1607 | tun->dev = dev; | |
1608 | tun->flags = flags; | |
f271b2cc | 1609 | tun->txflt.count = 0; |
d9d52b51 | 1610 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 1611 | |
54f968d6 JW |
1612 | tun->filter_attached = false; |
1613 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
33dccbb0 | 1614 | |
96442e42 JW |
1615 | spin_lock_init(&tun->lock); |
1616 | ||
54f968d6 | 1617 | security_tun_dev_post_create(&tfile->sk); |
2b980dbd | 1618 | |
1da177e4 LT |
1619 | tun_net_init(dev); |
1620 | ||
b3943aef PM |
1621 | err = tun_flow_init(tun); |
1622 | if (err < 0) | |
96442e42 JW |
1623 | goto err_free_dev; |
1624 | ||
88255375 MM |
1625 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
1626 | TUN_USER_FEATURES; | |
1627 | dev->features = dev->hw_features; | |
1628 | ||
4008e97f | 1629 | INIT_LIST_HEAD(&tun->disabled); |
eb0fb363 JW |
1630 | err = tun_attach(tun, file); |
1631 | if (err < 0) | |
1632 | goto err_free_dev; | |
1633 | ||
1da177e4 LT |
1634 | err = register_netdevice(tun->dev); |
1635 | if (err < 0) | |
54f968d6 | 1636 | goto err_free_dev; |
9c3fea6a | 1637 | |
980c9e8c DW |
1638 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1639 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1640 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
6b8a66ee | 1641 | pr_err("Failed to create tun sysfs files\n"); |
980c9e8c | 1642 | |
eb0fb363 | 1643 | netif_carrier_on(tun->dev); |
1da177e4 LT |
1644 | } |
1645 | ||
6b8a66ee | 1646 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 LT |
1647 | |
1648 | if (ifr->ifr_flags & IFF_NO_PI) | |
1649 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1650 | else |
1651 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 | 1652 | |
5d097109 MT |
1653 | /* This flag has no real effect. We track the value for backwards |
1654 | * compatibility. | |
1655 | */ | |
1da177e4 LT |
1656 | if (ifr->ifr_flags & IFF_ONE_QUEUE) |
1657 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1658 | else |
1659 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1660 | |
f43798c2 RR |
1661 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1662 | tun->flags |= TUN_VNET_HDR; | |
1663 | else | |
1664 | tun->flags &= ~TUN_VNET_HDR; | |
1665 | ||
c8d68e6b JW |
1666 | if (ifr->ifr_flags & IFF_MULTI_QUEUE) |
1667 | tun->flags |= TUN_TAP_MQ; | |
1668 | else | |
1669 | tun->flags &= ~TUN_TAP_MQ; | |
1670 | ||
e35259a9 MK |
1671 | /* Make sure persistent devices do not get stuck in |
1672 | * xoff state. | |
1673 | */ | |
1674 | if (netif_running(tun->dev)) | |
c8d68e6b | 1675 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 1676 | |
1da177e4 LT |
1677 | strcpy(ifr->ifr_name, tun->dev->name); |
1678 | return 0; | |
1679 | ||
1680 | err_free_dev: | |
1681 | free_netdev(dev); | |
1da177e4 LT |
1682 | return err; |
1683 | } | |
1684 | ||
9ce99cf6 | 1685 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 1686 | struct ifreq *ifr) |
e3b99556 | 1687 | { |
6b8a66ee | 1688 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1689 | |
1690 | strcpy(ifr->ifr_name, tun->dev->name); | |
1691 | ||
980c9e8c | 1692 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 1693 | |
e3b99556 MM |
1694 | } |
1695 | ||
5228ddc9 RR |
1696 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1697 | * privs required. */ | |
88255375 | 1698 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1699 | { |
c8f44aff | 1700 | netdev_features_t features = 0; |
5228ddc9 RR |
1701 | |
1702 | if (arg & TUN_F_CSUM) { | |
88255375 | 1703 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1704 | arg &= ~TUN_F_CSUM; |
1705 | ||
1706 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1707 | if (arg & TUN_F_TSO_ECN) { | |
1708 | features |= NETIF_F_TSO_ECN; | |
1709 | arg &= ~TUN_F_TSO_ECN; | |
1710 | } | |
1711 | if (arg & TUN_F_TSO4) | |
1712 | features |= NETIF_F_TSO; | |
1713 | if (arg & TUN_F_TSO6) | |
1714 | features |= NETIF_F_TSO6; | |
1715 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1716 | } | |
e36aa25a SS |
1717 | |
1718 | if (arg & TUN_F_UFO) { | |
1719 | features |= NETIF_F_UFO; | |
1720 | arg &= ~TUN_F_UFO; | |
1721 | } | |
5228ddc9 RR |
1722 | } |
1723 | ||
1724 | /* This gives the user a way to test for new features in future by | |
1725 | * trying to set them. */ | |
1726 | if (arg) | |
1727 | return -EINVAL; | |
1728 | ||
88255375 MM |
1729 | tun->set_features = features; |
1730 | netdev_update_features(tun->dev); | |
5228ddc9 RR |
1731 | |
1732 | return 0; | |
1733 | } | |
1734 | ||
c8d68e6b JW |
1735 | static void tun_detach_filter(struct tun_struct *tun, int n) |
1736 | { | |
1737 | int i; | |
1738 | struct tun_file *tfile; | |
1739 | ||
1740 | for (i = 0; i < n; i++) { | |
b8deabd3 | 1741 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1742 | sk_detach_filter(tfile->socket.sk); |
1743 | } | |
1744 | ||
1745 | tun->filter_attached = false; | |
1746 | } | |
1747 | ||
1748 | static int tun_attach_filter(struct tun_struct *tun) | |
1749 | { | |
1750 | int i, ret = 0; | |
1751 | struct tun_file *tfile; | |
1752 | ||
1753 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1754 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1755 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
1756 | if (ret) { | |
1757 | tun_detach_filter(tun, i); | |
1758 | return ret; | |
1759 | } | |
1760 | } | |
1761 | ||
1762 | tun->filter_attached = true; | |
1763 | return ret; | |
1764 | } | |
1765 | ||
1766 | static void tun_set_sndbuf(struct tun_struct *tun) | |
1767 | { | |
1768 | struct tun_file *tfile; | |
1769 | int i; | |
1770 | ||
1771 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1772 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1773 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
1774 | } | |
1775 | } | |
1776 | ||
cde8b15f JW |
1777 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
1778 | { | |
1779 | struct tun_file *tfile = file->private_data; | |
1780 | struct tun_struct *tun; | |
cde8b15f JW |
1781 | int ret = 0; |
1782 | ||
1783 | rtnl_lock(); | |
1784 | ||
1785 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f JW |
1786 | tun = tfile->detached; |
1787 | if (!tun) | |
cde8b15f | 1788 | ret = -EINVAL; |
cde8b15f JW |
1789 | else |
1790 | ret = tun_attach(tun, file); | |
4008e97f | 1791 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 1792 | tun = rtnl_dereference(tfile->tun); |
4008e97f JW |
1793 | if (!tun || !(tun->flags & TUN_TAP_MQ)) |
1794 | ret = -EINVAL; | |
1795 | else | |
1796 | __tun_detach(tfile, false); | |
1797 | } else | |
cde8b15f JW |
1798 | ret = -EINVAL; |
1799 | ||
cde8b15f JW |
1800 | rtnl_unlock(); |
1801 | return ret; | |
1802 | } | |
1803 | ||
50857e2a AB |
1804 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1805 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1806 | { |
36b50bab | 1807 | struct tun_file *tfile = file->private_data; |
631ab46b | 1808 | struct tun_struct *tun; |
1da177e4 LT |
1809 | void __user* argp = (void __user*)arg; |
1810 | struct ifreq ifr; | |
0625c883 EB |
1811 | kuid_t owner; |
1812 | kgid_t group; | |
33dccbb0 | 1813 | int sndbuf; |
d9d52b51 | 1814 | int vnet_hdr_sz; |
f271b2cc | 1815 | int ret; |
1da177e4 | 1816 | |
cde8b15f | 1817 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) { |
50857e2a | 1818 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 1819 | return -EFAULT; |
8bbb1813 | 1820 | } else { |
a117dacd | 1821 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 1822 | } |
631ab46b EB |
1823 | if (cmd == TUNGETFEATURES) { |
1824 | /* Currently this just means: "what IFF flags are valid?". | |
1825 | * This is needed because we never checked for invalid flags on | |
1826 | * TUNSETIFF. */ | |
1827 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
cde8b15f | 1828 | IFF_VNET_HDR | IFF_MULTI_QUEUE, |
631ab46b | 1829 | (unsigned int __user*)argp); |
cde8b15f JW |
1830 | } else if (cmd == TUNSETQUEUE) |
1831 | return tun_set_queue(file, &ifr); | |
631ab46b | 1832 | |
c8d68e6b | 1833 | ret = 0; |
876bfd4d HX |
1834 | rtnl_lock(); |
1835 | ||
36b50bab | 1836 | tun = __tun_get(tfile); |
1da177e4 | 1837 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1838 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1839 | ||
876bfd4d | 1840 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1841 | |
876bfd4d HX |
1842 | if (ret) |
1843 | goto unlock; | |
1da177e4 | 1844 | |
50857e2a | 1845 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1846 | ret = -EFAULT; |
1847 | goto unlock; | |
1da177e4 LT |
1848 | } |
1849 | ||
876bfd4d | 1850 | ret = -EBADFD; |
1da177e4 | 1851 | if (!tun) |
876bfd4d | 1852 | goto unlock; |
1da177e4 | 1853 | |
1e588338 | 1854 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 1855 | |
631ab46b | 1856 | ret = 0; |
1da177e4 | 1857 | switch (cmd) { |
e3b99556 | 1858 | case TUNGETIFF: |
9ce99cf6 | 1859 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1860 | |
50857e2a | 1861 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1862 | ret = -EFAULT; |
e3b99556 MM |
1863 | break; |
1864 | ||
1da177e4 LT |
1865 | case TUNSETNOCSUM: |
1866 | /* Disable/Enable checksum */ | |
1da177e4 | 1867 | |
88255375 MM |
1868 | /* [unimplemented] */ |
1869 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 1870 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
1871 | break; |
1872 | ||
1873 | case TUNSETPERSIST: | |
54f968d6 JW |
1874 | /* Disable/Enable persist mode. Keep an extra reference to the |
1875 | * module to prevent the module being unprobed. | |
1876 | */ | |
1877 | if (arg) { | |
1da177e4 | 1878 | tun->flags |= TUN_PERSIST; |
54f968d6 JW |
1879 | __module_get(THIS_MODULE); |
1880 | } else { | |
1da177e4 | 1881 | tun->flags &= ~TUN_PERSIST; |
54f968d6 JW |
1882 | module_put(THIS_MODULE); |
1883 | } | |
1da177e4 | 1884 | |
6b8a66ee JP |
1885 | tun_debug(KERN_INFO, tun, "persist %s\n", |
1886 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
1887 | break; |
1888 | ||
1889 | case TUNSETOWNER: | |
1890 | /* Set owner of the device */ | |
0625c883 EB |
1891 | owner = make_kuid(current_user_ns(), arg); |
1892 | if (!uid_valid(owner)) { | |
1893 | ret = -EINVAL; | |
1894 | break; | |
1895 | } | |
1896 | tun->owner = owner; | |
1e588338 | 1897 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 1898 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
1899 | break; |
1900 | ||
8c644623 GG |
1901 | case TUNSETGROUP: |
1902 | /* Set group of the device */ | |
0625c883 EB |
1903 | group = make_kgid(current_user_ns(), arg); |
1904 | if (!gid_valid(group)) { | |
1905 | ret = -EINVAL; | |
1906 | break; | |
1907 | } | |
1908 | tun->group = group; | |
1e588338 | 1909 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 1910 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
1911 | break; |
1912 | ||
ff4cc3ac MK |
1913 | case TUNSETLINK: |
1914 | /* Only allow setting the type when the interface is down */ | |
1915 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
1916 | tun_debug(KERN_INFO, tun, |
1917 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 1918 | ret = -EBUSY; |
ff4cc3ac MK |
1919 | } else { |
1920 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
1921 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
1922 | tun->dev->type); | |
48abfe05 | 1923 | ret = 0; |
ff4cc3ac | 1924 | } |
631ab46b | 1925 | break; |
ff4cc3ac | 1926 | |
1da177e4 LT |
1927 | #ifdef TUN_DEBUG |
1928 | case TUNSETDEBUG: | |
1929 | tun->debug = arg; | |
1930 | break; | |
1931 | #endif | |
5228ddc9 | 1932 | case TUNSETOFFLOAD: |
88255375 | 1933 | ret = set_offload(tun, arg); |
631ab46b | 1934 | break; |
5228ddc9 | 1935 | |
f271b2cc MK |
1936 | case TUNSETTXFILTER: |
1937 | /* Can be set only for TAPs */ | |
631ab46b | 1938 | ret = -EINVAL; |
f271b2cc | 1939 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 1940 | break; |
c0e5a8c2 | 1941 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 1942 | break; |
1da177e4 LT |
1943 | |
1944 | case SIOCGIFHWADDR: | |
b595076a | 1945 | /* Get hw address */ |
f271b2cc MK |
1946 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
1947 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 1948 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
1949 | ret = -EFAULT; |
1950 | break; | |
1da177e4 LT |
1951 | |
1952 | case SIOCSIFHWADDR: | |
f271b2cc | 1953 | /* Set hw address */ |
6b8a66ee JP |
1954 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
1955 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 1956 | |
40102371 | 1957 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 1958 | break; |
33dccbb0 HX |
1959 | |
1960 | case TUNGETSNDBUF: | |
54f968d6 | 1961 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
1962 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
1963 | ret = -EFAULT; | |
1964 | break; | |
1965 | ||
1966 | case TUNSETSNDBUF: | |
1967 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
1968 | ret = -EFAULT; | |
1969 | break; | |
1970 | } | |
1971 | ||
c8d68e6b JW |
1972 | tun->sndbuf = sndbuf; |
1973 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
1974 | break; |
1975 | ||
d9d52b51 MT |
1976 | case TUNGETVNETHDRSZ: |
1977 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
1978 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
1979 | ret = -EFAULT; | |
1980 | break; | |
1981 | ||
1982 | case TUNSETVNETHDRSZ: | |
1983 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
1984 | ret = -EFAULT; | |
1985 | break; | |
1986 | } | |
1987 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
1988 | ret = -EINVAL; | |
1989 | break; | |
1990 | } | |
1991 | ||
1992 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
1993 | break; | |
1994 | ||
99405162 MT |
1995 | case TUNATTACHFILTER: |
1996 | /* Can be set only for TAPs */ | |
1997 | ret = -EINVAL; | |
1998 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
1999 | break; | |
2000 | ret = -EFAULT; | |
54f968d6 | 2001 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
2002 | break; |
2003 | ||
c8d68e6b | 2004 | ret = tun_attach_filter(tun); |
99405162 MT |
2005 | break; |
2006 | ||
2007 | case TUNDETACHFILTER: | |
2008 | /* Can be set only for TAPs */ | |
2009 | ret = -EINVAL; | |
2010 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2011 | break; | |
c8d68e6b JW |
2012 | ret = 0; |
2013 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
2014 | break; |
2015 | ||
1da177e4 | 2016 | default: |
631ab46b EB |
2017 | ret = -EINVAL; |
2018 | break; | |
ee289b64 | 2019 | } |
1da177e4 | 2020 | |
876bfd4d HX |
2021 | unlock: |
2022 | rtnl_unlock(); | |
2023 | if (tun) | |
2024 | tun_put(tun); | |
631ab46b | 2025 | return ret; |
1da177e4 LT |
2026 | } |
2027 | ||
50857e2a AB |
2028 | static long tun_chr_ioctl(struct file *file, |
2029 | unsigned int cmd, unsigned long arg) | |
2030 | { | |
2031 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
2032 | } | |
2033 | ||
2034 | #ifdef CONFIG_COMPAT | |
2035 | static long tun_chr_compat_ioctl(struct file *file, | |
2036 | unsigned int cmd, unsigned long arg) | |
2037 | { | |
2038 | switch (cmd) { | |
2039 | case TUNSETIFF: | |
2040 | case TUNGETIFF: | |
2041 | case TUNSETTXFILTER: | |
2042 | case TUNGETSNDBUF: | |
2043 | case TUNSETSNDBUF: | |
2044 | case SIOCGIFHWADDR: | |
2045 | case SIOCSIFHWADDR: | |
2046 | arg = (unsigned long)compat_ptr(arg); | |
2047 | break; | |
2048 | default: | |
2049 | arg = (compat_ulong_t)arg; | |
2050 | break; | |
2051 | } | |
2052 | ||
2053 | /* | |
2054 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
2055 | * the end of that structure. All fields that are used in this | |
2056 | * driver are compatible though, we don't need to convert the | |
2057 | * contents. | |
2058 | */ | |
2059 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
2060 | } | |
2061 | #endif /* CONFIG_COMPAT */ | |
2062 | ||
1da177e4 LT |
2063 | static int tun_chr_fasync(int fd, struct file *file, int on) |
2064 | { | |
54f968d6 | 2065 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2066 | int ret; |
2067 | ||
54f968d6 | 2068 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 2069 | goto out; |
6aa20a22 | 2070 | |
1da177e4 | 2071 | if (on) { |
609d7fa9 | 2072 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 2073 | if (ret) |
9d319522 | 2074 | goto out; |
54f968d6 | 2075 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 2076 | } else |
54f968d6 | 2077 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
2078 | ret = 0; |
2079 | out: | |
9d319522 | 2080 | return ret; |
1da177e4 LT |
2081 | } |
2082 | ||
2083 | static int tun_chr_open(struct inode *inode, struct file * file) | |
2084 | { | |
631ab46b | 2085 | struct tun_file *tfile; |
deed49fb | 2086 | |
6b8a66ee | 2087 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 2088 | |
54f968d6 JW |
2089 | tfile = (struct tun_file *)sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL, |
2090 | &tun_proto); | |
631ab46b EB |
2091 | if (!tfile) |
2092 | return -ENOMEM; | |
6e914fc7 | 2093 | rcu_assign_pointer(tfile->tun, NULL); |
36b50bab | 2094 | tfile->net = get_net(current->nsproxy->net_ns); |
54f968d6 JW |
2095 | tfile->flags = 0; |
2096 | ||
2097 | rcu_assign_pointer(tfile->socket.wq, &tfile->wq); | |
2098 | init_waitqueue_head(&tfile->wq.wait); | |
2099 | ||
2100 | tfile->socket.file = file; | |
2101 | tfile->socket.ops = &tun_socket_ops; | |
2102 | ||
2103 | sock_init_data(&tfile->socket, &tfile->sk); | |
2104 | sk_change_net(&tfile->sk, tfile->net); | |
2105 | ||
2106 | tfile->sk.sk_write_space = tun_sock_write_space; | |
2107 | tfile->sk.sk_sndbuf = INT_MAX; | |
2108 | ||
631ab46b | 2109 | file->private_data = tfile; |
54f968d6 | 2110 | set_bit(SOCK_EXTERNALLY_ALLOCATED, &tfile->socket.flags); |
4008e97f | 2111 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 2112 | |
1da177e4 LT |
2113 | return 0; |
2114 | } | |
2115 | ||
2116 | static int tun_chr_close(struct inode *inode, struct file *file) | |
2117 | { | |
631ab46b | 2118 | struct tun_file *tfile = file->private_data; |
54f968d6 | 2119 | struct net *net = tfile->net; |
1da177e4 | 2120 | |
c8d68e6b | 2121 | tun_detach(tfile, true); |
54f968d6 | 2122 | put_net(net); |
1da177e4 LT |
2123 | |
2124 | return 0; | |
2125 | } | |
2126 | ||
d54b1fdb | 2127 | static const struct file_operations tun_fops = { |
6aa20a22 | 2128 | .owner = THIS_MODULE, |
1da177e4 | 2129 | .llseek = no_llseek, |
ee0b3e67 BP |
2130 | .read = do_sync_read, |
2131 | .aio_read = tun_chr_aio_read, | |
2132 | .write = do_sync_write, | |
2133 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 2134 | .poll = tun_chr_poll, |
50857e2a AB |
2135 | .unlocked_ioctl = tun_chr_ioctl, |
2136 | #ifdef CONFIG_COMPAT | |
2137 | .compat_ioctl = tun_chr_compat_ioctl, | |
2138 | #endif | |
1da177e4 LT |
2139 | .open = tun_chr_open, |
2140 | .release = tun_chr_close, | |
6aa20a22 | 2141 | .fasync = tun_chr_fasync |
1da177e4 LT |
2142 | }; |
2143 | ||
2144 | static struct miscdevice tun_miscdev = { | |
2145 | .minor = TUN_MINOR, | |
2146 | .name = "tun", | |
e454cea2 | 2147 | .nodename = "net/tun", |
1da177e4 | 2148 | .fops = &tun_fops, |
1da177e4 LT |
2149 | }; |
2150 | ||
2151 | /* ethtool interface */ | |
2152 | ||
2153 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
2154 | { | |
2155 | cmd->supported = 0; | |
2156 | cmd->advertising = 0; | |
70739497 | 2157 | ethtool_cmd_speed_set(cmd, SPEED_10); |
1da177e4 LT |
2158 | cmd->duplex = DUPLEX_FULL; |
2159 | cmd->port = PORT_TP; | |
2160 | cmd->phy_address = 0; | |
2161 | cmd->transceiver = XCVR_INTERNAL; | |
2162 | cmd->autoneg = AUTONEG_DISABLE; | |
2163 | cmd->maxtxpkt = 0; | |
2164 | cmd->maxrxpkt = 0; | |
2165 | return 0; | |
2166 | } | |
2167 | ||
2168 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
2169 | { | |
2170 | struct tun_struct *tun = netdev_priv(dev); | |
2171 | ||
33a5ba14 RJ |
2172 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
2173 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
2174 | |
2175 | switch (tun->flags & TUN_TYPE_MASK) { | |
2176 | case TUN_TUN_DEV: | |
33a5ba14 | 2177 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 LT |
2178 | break; |
2179 | case TUN_TAP_DEV: | |
33a5ba14 | 2180 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
2181 | break; |
2182 | } | |
2183 | } | |
2184 | ||
2185 | static u32 tun_get_msglevel(struct net_device *dev) | |
2186 | { | |
2187 | #ifdef TUN_DEBUG | |
2188 | struct tun_struct *tun = netdev_priv(dev); | |
2189 | return tun->debug; | |
2190 | #else | |
2191 | return -EOPNOTSUPP; | |
2192 | #endif | |
2193 | } | |
2194 | ||
2195 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
2196 | { | |
2197 | #ifdef TUN_DEBUG | |
2198 | struct tun_struct *tun = netdev_priv(dev); | |
2199 | tun->debug = value; | |
2200 | #endif | |
2201 | } | |
2202 | ||
7282d491 | 2203 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
2204 | .get_settings = tun_get_settings, |
2205 | .get_drvinfo = tun_get_drvinfo, | |
2206 | .get_msglevel = tun_get_msglevel, | |
2207 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 2208 | .get_link = ethtool_op_get_link, |
1da177e4 LT |
2209 | }; |
2210 | ||
79d17604 | 2211 | |
1da177e4 LT |
2212 | static int __init tun_init(void) |
2213 | { | |
2214 | int ret = 0; | |
2215 | ||
6b8a66ee JP |
2216 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
2217 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 2218 | |
f019a7a5 | 2219 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 2220 | if (ret) { |
6b8a66ee | 2221 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 2222 | goto err_linkops; |
79d17604 PE |
2223 | } |
2224 | ||
1da177e4 | 2225 | ret = misc_register(&tun_miscdev); |
79d17604 | 2226 | if (ret) { |
6b8a66ee | 2227 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
2228 | goto err_misc; |
2229 | } | |
f019a7a5 | 2230 | return 0; |
79d17604 | 2231 | err_misc: |
f019a7a5 EB |
2232 | rtnl_link_unregister(&tun_link_ops); |
2233 | err_linkops: | |
1da177e4 LT |
2234 | return ret; |
2235 | } | |
2236 | ||
2237 | static void tun_cleanup(void) | |
2238 | { | |
6aa20a22 | 2239 | misc_deregister(&tun_miscdev); |
f019a7a5 | 2240 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
2241 | } |
2242 | ||
05c2828c MT |
2243 | /* Get an underlying socket object from tun file. Returns error unless file is |
2244 | * attached to a device. The returned object works like a packet socket, it | |
2245 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
2246 | * holding a reference to the file for as long as the socket is in use. */ | |
2247 | struct socket *tun_get_socket(struct file *file) | |
2248 | { | |
6e914fc7 | 2249 | struct tun_file *tfile; |
05c2828c MT |
2250 | if (file->f_op != &tun_fops) |
2251 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
2252 | tfile = file->private_data; |
2253 | if (!tfile) | |
05c2828c | 2254 | return ERR_PTR(-EBADFD); |
54f968d6 | 2255 | return &tfile->socket; |
05c2828c MT |
2256 | } |
2257 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
2258 | ||
1da177e4 LT |
2259 | module_init(tun_init); |
2260 | module_exit(tun_cleanup); | |
2261 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
2262 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
2263 | MODULE_LICENSE("GPL"); | |
2264 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 2265 | MODULE_ALIAS("devname:net/tun"); |