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 | ||
edfb6a14 JW |
112 | /* DEFAULT_MAX_NUM_RSS_QUEUES were choosed to let the rx/tx queues allocated for |
113 | * the netdevice to be fit in one page. So we can make sure the success of | |
114 | * memory allocation. TODO: increase the limit. */ | |
115 | #define MAX_TAP_QUEUES DEFAULT_MAX_NUM_RSS_QUEUES | |
b8732fb7 | 116 | #define MAX_TAP_FLOWS 4096 |
c8d68e6b | 117 | |
96442e42 JW |
118 | #define TUN_FLOW_EXPIRE (3 * HZ) |
119 | ||
54f968d6 JW |
120 | /* A tun_file connects an open character device to a tuntap netdevice. It |
121 | * also contains all socket related strctures (except sock_fprog and tap_filter) | |
122 | * to serve as one transmit queue for tuntap device. The sock_fprog and | |
123 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 124 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 125 | * this). |
6e914fc7 JW |
126 | * |
127 | * RCU usage: | |
36fe8c09 | 128 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 129 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 130 | */ |
631ab46b | 131 | struct tun_file { |
54f968d6 JW |
132 | struct sock sk; |
133 | struct socket socket; | |
134 | struct socket_wq wq; | |
6e914fc7 | 135 | struct tun_struct __rcu *tun; |
36b50bab | 136 | struct net *net; |
54f968d6 JW |
137 | struct fasync_struct *fasync; |
138 | /* only used for fasnyc */ | |
139 | unsigned int flags; | |
c8d68e6b | 140 | u16 queue_index; |
4008e97f JW |
141 | struct list_head next; |
142 | struct tun_struct *detached; | |
631ab46b EB |
143 | }; |
144 | ||
96442e42 JW |
145 | struct tun_flow_entry { |
146 | struct hlist_node hash_link; | |
147 | struct rcu_head rcu; | |
148 | struct tun_struct *tun; | |
149 | ||
150 | u32 rxhash; | |
151 | int queue_index; | |
152 | unsigned long updated; | |
153 | }; | |
154 | ||
155 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
156 | ||
54f968d6 | 157 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 158 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
159 | * file were attached to a persist device. |
160 | */ | |
14daa021 | 161 | struct tun_struct { |
c8d68e6b JW |
162 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
163 | unsigned int numqueues; | |
f271b2cc | 164 | unsigned int flags; |
0625c883 EB |
165 | kuid_t owner; |
166 | kgid_t group; | |
14daa021 | 167 | |
14daa021 | 168 | struct net_device *dev; |
c8f44aff | 169 | netdev_features_t set_features; |
88255375 MM |
170 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
171 | NETIF_F_TSO6|NETIF_F_UFO) | |
d9d52b51 MT |
172 | |
173 | int vnet_hdr_sz; | |
54f968d6 JW |
174 | int sndbuf; |
175 | struct tap_filter txflt; | |
176 | struct sock_fprog fprog; | |
177 | /* protected by rtnl lock */ | |
178 | bool filter_attached; | |
14daa021 RR |
179 | #ifdef TUN_DEBUG |
180 | int debug; | |
1da177e4 | 181 | #endif |
96442e42 | 182 | spinlock_t lock; |
96442e42 JW |
183 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
184 | struct timer_list flow_gc_timer; | |
185 | unsigned long ageing_time; | |
4008e97f JW |
186 | unsigned int numdisabled; |
187 | struct list_head disabled; | |
5dbbaf2d | 188 | void *security; |
b8732fb7 | 189 | u32 flow_count; |
14daa021 | 190 | }; |
1da177e4 | 191 | |
96442e42 JW |
192 | static inline u32 tun_hashfn(u32 rxhash) |
193 | { | |
194 | return rxhash & 0x3ff; | |
195 | } | |
196 | ||
197 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
198 | { | |
199 | struct tun_flow_entry *e; | |
96442e42 | 200 | |
b67bfe0d | 201 | hlist_for_each_entry_rcu(e, head, hash_link) { |
96442e42 JW |
202 | if (e->rxhash == rxhash) |
203 | return e; | |
204 | } | |
205 | return NULL; | |
206 | } | |
207 | ||
208 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
209 | struct hlist_head *head, | |
210 | u32 rxhash, u16 queue_index) | |
211 | { | |
9fdc6bef ED |
212 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
213 | ||
96442e42 JW |
214 | if (e) { |
215 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
216 | rxhash, queue_index); | |
217 | e->updated = jiffies; | |
218 | e->rxhash = rxhash; | |
219 | e->queue_index = queue_index; | |
220 | e->tun = tun; | |
221 | hlist_add_head_rcu(&e->hash_link, head); | |
b8732fb7 | 222 | ++tun->flow_count; |
96442e42 JW |
223 | } |
224 | return e; | |
225 | } | |
226 | ||
96442e42 JW |
227 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
228 | { | |
229 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
230 | e->rxhash, e->queue_index); | |
231 | hlist_del_rcu(&e->hash_link); | |
9fdc6bef | 232 | kfree_rcu(e, rcu); |
b8732fb7 | 233 | --tun->flow_count; |
96442e42 JW |
234 | } |
235 | ||
236 | static void tun_flow_flush(struct tun_struct *tun) | |
237 | { | |
238 | int i; | |
239 | ||
240 | spin_lock_bh(&tun->lock); | |
241 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
242 | struct tun_flow_entry *e; | |
b67bfe0d | 243 | struct hlist_node *n; |
96442e42 | 244 | |
b67bfe0d | 245 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
96442e42 JW |
246 | tun_flow_delete(tun, e); |
247 | } | |
248 | spin_unlock_bh(&tun->lock); | |
249 | } | |
250 | ||
251 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
252 | { | |
253 | int i; | |
254 | ||
255 | spin_lock_bh(&tun->lock); | |
256 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
257 | struct tun_flow_entry *e; | |
b67bfe0d | 258 | struct hlist_node *n; |
96442e42 | 259 | |
b67bfe0d | 260 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
261 | if (e->queue_index == queue_index) |
262 | tun_flow_delete(tun, e); | |
263 | } | |
264 | } | |
265 | spin_unlock_bh(&tun->lock); | |
266 | } | |
267 | ||
268 | static void tun_flow_cleanup(unsigned long data) | |
269 | { | |
270 | struct tun_struct *tun = (struct tun_struct *)data; | |
271 | unsigned long delay = tun->ageing_time; | |
272 | unsigned long next_timer = jiffies + delay; | |
273 | unsigned long count = 0; | |
274 | int i; | |
275 | ||
276 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
277 | ||
278 | spin_lock_bh(&tun->lock); | |
279 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
280 | struct tun_flow_entry *e; | |
b67bfe0d | 281 | struct hlist_node *n; |
96442e42 | 282 | |
b67bfe0d | 283 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
284 | unsigned long this_timer; |
285 | count++; | |
286 | this_timer = e->updated + delay; | |
287 | if (time_before_eq(this_timer, jiffies)) | |
288 | tun_flow_delete(tun, e); | |
289 | else if (time_before(this_timer, next_timer)) | |
290 | next_timer = this_timer; | |
291 | } | |
292 | } | |
293 | ||
294 | if (count) | |
295 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
296 | spin_unlock_bh(&tun->lock); | |
297 | } | |
298 | ||
49974420 | 299 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
9e85722d | 300 | struct tun_file *tfile) |
96442e42 JW |
301 | { |
302 | struct hlist_head *head; | |
303 | struct tun_flow_entry *e; | |
304 | unsigned long delay = tun->ageing_time; | |
9e85722d | 305 | u16 queue_index = tfile->queue_index; |
96442e42 JW |
306 | |
307 | if (!rxhash) | |
308 | return; | |
309 | else | |
310 | head = &tun->flows[tun_hashfn(rxhash)]; | |
311 | ||
312 | rcu_read_lock(); | |
313 | ||
9e85722d JW |
314 | /* We may get a very small possibility of OOO during switching, not |
315 | * worth to optimize.*/ | |
316 | if (tun->numqueues == 1 || tfile->detached) | |
96442e42 JW |
317 | goto unlock; |
318 | ||
319 | e = tun_flow_find(head, rxhash); | |
320 | if (likely(e)) { | |
321 | /* TODO: keep queueing to old queue until it's empty? */ | |
322 | e->queue_index = queue_index; | |
323 | e->updated = jiffies; | |
324 | } else { | |
325 | spin_lock_bh(&tun->lock); | |
b8732fb7 JW |
326 | if (!tun_flow_find(head, rxhash) && |
327 | tun->flow_count < MAX_TAP_FLOWS) | |
96442e42 JW |
328 | tun_flow_create(tun, head, rxhash, queue_index); |
329 | ||
330 | if (!timer_pending(&tun->flow_gc_timer)) | |
331 | mod_timer(&tun->flow_gc_timer, | |
332 | round_jiffies_up(jiffies + delay)); | |
333 | spin_unlock_bh(&tun->lock); | |
334 | } | |
335 | ||
336 | unlock: | |
337 | rcu_read_unlock(); | |
338 | } | |
339 | ||
c8d68e6b JW |
340 | /* We try to identify a flow through its rxhash first. The reason that |
341 | * we do not check rxq no. is becuase some cards(e.g 82599), chooses | |
342 | * the rxq based on the txq where the last packet of the flow comes. As | |
343 | * the userspace application move between processors, we may get a | |
344 | * different rxq no. here. If we could not get rxhash, then we would | |
345 | * hope the rxq no. may help here. | |
346 | */ | |
347 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb) | |
348 | { | |
349 | struct tun_struct *tun = netdev_priv(dev); | |
96442e42 | 350 | struct tun_flow_entry *e; |
c8d68e6b JW |
351 | u32 txq = 0; |
352 | u32 numqueues = 0; | |
353 | ||
354 | rcu_read_lock(); | |
92bb73ea | 355 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b JW |
356 | |
357 | txq = skb_get_rxhash(skb); | |
358 | if (txq) { | |
96442e42 JW |
359 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
360 | if (e) | |
361 | txq = e->queue_index; | |
362 | else | |
363 | /* use multiply and shift instead of expensive divide */ | |
364 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
365 | } else if (likely(skb_rx_queue_recorded(skb))) { |
366 | txq = skb_get_rx_queue(skb); | |
367 | while (unlikely(txq >= numqueues)) | |
368 | txq -= numqueues; | |
369 | } | |
370 | ||
371 | rcu_read_unlock(); | |
372 | return txq; | |
373 | } | |
374 | ||
cde8b15f JW |
375 | static inline bool tun_not_capable(struct tun_struct *tun) |
376 | { | |
377 | const struct cred *cred = current_cred(); | |
c260b772 | 378 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
379 | |
380 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
381 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 382 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
383 | } |
384 | ||
c8d68e6b JW |
385 | static void tun_set_real_num_queues(struct tun_struct *tun) |
386 | { | |
387 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
388 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
389 | } | |
390 | ||
4008e97f JW |
391 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
392 | { | |
393 | tfile->detached = tun; | |
394 | list_add_tail(&tfile->next, &tun->disabled); | |
395 | ++tun->numdisabled; | |
396 | } | |
397 | ||
d32649d1 | 398 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
399 | { |
400 | struct tun_struct *tun = tfile->detached; | |
401 | ||
402 | tfile->detached = NULL; | |
403 | list_del_init(&tfile->next); | |
404 | --tun->numdisabled; | |
405 | return tun; | |
406 | } | |
407 | ||
c8d68e6b JW |
408 | static void __tun_detach(struct tun_file *tfile, bool clean) |
409 | { | |
410 | struct tun_file *ntfile; | |
411 | struct tun_struct *tun; | |
c8d68e6b | 412 | |
b8deabd3 JW |
413 | tun = rtnl_dereference(tfile->tun); |
414 | ||
9e85722d | 415 | if (tun && !tfile->detached) { |
c8d68e6b JW |
416 | u16 index = tfile->queue_index; |
417 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
418 | |
419 | rcu_assign_pointer(tun->tfiles[index], | |
420 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 421 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
422 | ntfile->queue_index = index; |
423 | ||
424 | --tun->numqueues; | |
9e85722d JW |
425 | if (clean) { |
426 | rcu_assign_pointer(tfile->tun, NULL); | |
4008e97f | 427 | sock_put(&tfile->sk); |
9e85722d | 428 | } else |
4008e97f | 429 | tun_disable_queue(tun, tfile); |
c8d68e6b JW |
430 | |
431 | synchronize_net(); | |
96442e42 | 432 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b JW |
433 | /* Drop read queue */ |
434 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
435 | tun_set_real_num_queues(tun); | |
dd38bd85 | 436 | } else if (tfile->detached && clean) { |
4008e97f | 437 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
438 | sock_put(&tfile->sk); |
439 | } | |
c8d68e6b JW |
440 | |
441 | if (clean) { | |
af668b3c MT |
442 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
443 | netif_carrier_off(tun->dev); | |
444 | ||
445 | if (!(tun->flags & TUN_PERSIST) && | |
446 | tun->dev->reg_state == NETREG_REGISTERED) | |
4008e97f | 447 | unregister_netdevice(tun->dev); |
af668b3c | 448 | } |
4008e97f | 449 | |
c8d68e6b JW |
450 | BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED, |
451 | &tfile->socket.flags)); | |
452 | sk_release_kernel(&tfile->sk); | |
453 | } | |
454 | } | |
455 | ||
456 | static void tun_detach(struct tun_file *tfile, bool clean) | |
457 | { | |
458 | rtnl_lock(); | |
459 | __tun_detach(tfile, clean); | |
460 | rtnl_unlock(); | |
461 | } | |
462 | ||
463 | static void tun_detach_all(struct net_device *dev) | |
464 | { | |
465 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 466 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
467 | int i, n = tun->numqueues; |
468 | ||
469 | for (i = 0; i < n; i++) { | |
b8deabd3 | 470 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
471 | BUG_ON(!tfile); |
472 | wake_up_all(&tfile->wq.wait); | |
473 | rcu_assign_pointer(tfile->tun, NULL); | |
474 | --tun->numqueues; | |
475 | } | |
9e85722d JW |
476 | list_for_each_entry(tfile, &tun->disabled, next) { |
477 | wake_up_all(&tfile->wq.wait); | |
478 | rcu_assign_pointer(tfile->tun, NULL); | |
479 | } | |
c8d68e6b JW |
480 | BUG_ON(tun->numqueues != 0); |
481 | ||
482 | synchronize_net(); | |
483 | for (i = 0; i < n; i++) { | |
b8deabd3 | 484 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
485 | /* Drop read queue */ |
486 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
487 | sock_put(&tfile->sk); | |
488 | } | |
4008e97f JW |
489 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
490 | tun_enable_queue(tfile); | |
491 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
492 | sock_put(&tfile->sk); | |
493 | } | |
494 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 JW |
495 | |
496 | if (tun->flags & TUN_PERSIST) | |
497 | module_put(THIS_MODULE); | |
c8d68e6b JW |
498 | } |
499 | ||
a7385ba2 EB |
500 | static int tun_attach(struct tun_struct *tun, struct file *file) |
501 | { | |
631ab46b | 502 | struct tun_file *tfile = file->private_data; |
38231b7a | 503 | int err; |
a7385ba2 | 504 | |
5dbbaf2d PM |
505 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
506 | if (err < 0) | |
507 | goto out; | |
508 | ||
38231b7a | 509 | err = -EINVAL; |
9e85722d | 510 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
511 | goto out; |
512 | ||
513 | err = -EBUSY; | |
c8d68e6b JW |
514 | if (!(tun->flags & TUN_TAP_MQ) && tun->numqueues == 1) |
515 | goto out; | |
516 | ||
517 | err = -E2BIG; | |
4008e97f JW |
518 | if (!tfile->detached && |
519 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
520 | goto out; |
521 | ||
522 | err = 0; | |
54f968d6 | 523 | |
c8d68e6b | 524 | /* Re-attach the filter to presist device */ |
54f968d6 JW |
525 | if (tun->filter_attached == true) { |
526 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
527 | if (!err) | |
528 | goto out; | |
529 | } | |
c8d68e6b | 530 | tfile->queue_index = tun->numqueues; |
6e914fc7 | 531 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 532 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 533 | tun->numqueues++; |
a7385ba2 | 534 | |
4008e97f JW |
535 | if (tfile->detached) |
536 | tun_enable_queue(tfile); | |
537 | else | |
538 | sock_hold(&tfile->sk); | |
539 | ||
c8d68e6b | 540 | tun_set_real_num_queues(tun); |
a7385ba2 | 541 | |
c8d68e6b JW |
542 | /* device is allowed to go away first, so no need to hold extra |
543 | * refcnt. | |
544 | */ | |
545 | ||
546 | out: | |
547 | return err; | |
631ab46b EB |
548 | } |
549 | ||
550 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
551 | { | |
6e914fc7 | 552 | struct tun_struct *tun; |
c70f1829 | 553 | |
6e914fc7 JW |
554 | rcu_read_lock(); |
555 | tun = rcu_dereference(tfile->tun); | |
556 | if (tun) | |
557 | dev_hold(tun->dev); | |
558 | rcu_read_unlock(); | |
c70f1829 EB |
559 | |
560 | return tun; | |
631ab46b EB |
561 | } |
562 | ||
563 | static struct tun_struct *tun_get(struct file *file) | |
564 | { | |
565 | return __tun_get(file->private_data); | |
566 | } | |
567 | ||
568 | static void tun_put(struct tun_struct *tun) | |
569 | { | |
6e914fc7 | 570 | dev_put(tun->dev); |
631ab46b EB |
571 | } |
572 | ||
6b8a66ee | 573 | /* TAP filtering */ |
f271b2cc MK |
574 | static void addr_hash_set(u32 *mask, const u8 *addr) |
575 | { | |
576 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
577 | mask[n >> 5] |= (1 << (n & 31)); | |
578 | } | |
579 | ||
580 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
581 | { | |
582 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
583 | return mask[n >> 5] & (1 << (n & 31)); | |
584 | } | |
585 | ||
586 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
587 | { | |
588 | struct { u8 u[ETH_ALEN]; } *addr; | |
589 | struct tun_filter uf; | |
590 | int err, alen, n, nexact; | |
591 | ||
592 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
593 | return -EFAULT; | |
594 | ||
595 | if (!uf.count) { | |
596 | /* Disabled */ | |
597 | filter->count = 0; | |
598 | return 0; | |
599 | } | |
600 | ||
601 | alen = ETH_ALEN * uf.count; | |
602 | addr = kmalloc(alen, GFP_KERNEL); | |
603 | if (!addr) | |
604 | return -ENOMEM; | |
605 | ||
606 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
607 | err = -EFAULT; | |
608 | goto done; | |
609 | } | |
610 | ||
611 | /* The filter is updated without holding any locks. Which is | |
612 | * perfectly safe. We disable it first and in the worst | |
613 | * case we'll accept a few undesired packets. */ | |
614 | filter->count = 0; | |
615 | wmb(); | |
616 | ||
617 | /* Use first set of addresses as an exact filter */ | |
618 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
619 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
620 | ||
621 | nexact = n; | |
622 | ||
cfbf84fc AW |
623 | /* Remaining multicast addresses are hashed, |
624 | * unicast will leave the filter disabled. */ | |
f271b2cc | 625 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
626 | for (; n < uf.count; n++) { |
627 | if (!is_multicast_ether_addr(addr[n].u)) { | |
628 | err = 0; /* no filter */ | |
629 | goto done; | |
630 | } | |
f271b2cc | 631 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 632 | } |
f271b2cc MK |
633 | |
634 | /* For ALLMULTI just set the mask to all ones. | |
635 | * This overrides the mask populated above. */ | |
636 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
637 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
638 | ||
639 | /* Now enable the filter */ | |
640 | wmb(); | |
641 | filter->count = nexact; | |
642 | ||
643 | /* Return the number of exact filters */ | |
644 | err = nexact; | |
645 | ||
646 | done: | |
647 | kfree(addr); | |
648 | return err; | |
649 | } | |
650 | ||
651 | /* Returns: 0 - drop, !=0 - accept */ | |
652 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
653 | { | |
654 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
655 | * at this point. */ | |
656 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
657 | int i; | |
658 | ||
659 | /* Exact match */ | |
660 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 661 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
662 | return 1; |
663 | ||
664 | /* Inexact match (multicast only) */ | |
665 | if (is_multicast_ether_addr(eh->h_dest)) | |
666 | return addr_hash_test(filter->mask, eh->h_dest); | |
667 | ||
668 | return 0; | |
669 | } | |
670 | ||
671 | /* | |
672 | * Checks whether the packet is accepted or not. | |
673 | * Returns: 0 - drop, !=0 - accept | |
674 | */ | |
675 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
676 | { | |
677 | if (!filter->count) | |
678 | return 1; | |
679 | ||
680 | return run_filter(filter, skb); | |
681 | } | |
682 | ||
1da177e4 LT |
683 | /* Network device part of the driver */ |
684 | ||
7282d491 | 685 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 686 | |
c70f1829 EB |
687 | /* Net device detach from fd. */ |
688 | static void tun_net_uninit(struct net_device *dev) | |
689 | { | |
c8d68e6b | 690 | tun_detach_all(dev); |
c70f1829 EB |
691 | } |
692 | ||
1da177e4 LT |
693 | /* Net device open. */ |
694 | static int tun_net_open(struct net_device *dev) | |
695 | { | |
c8d68e6b | 696 | netif_tx_start_all_queues(dev); |
1da177e4 LT |
697 | return 0; |
698 | } | |
699 | ||
700 | /* Net device close. */ | |
701 | static int tun_net_close(struct net_device *dev) | |
702 | { | |
c8d68e6b | 703 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
704 | return 0; |
705 | } | |
706 | ||
707 | /* Net device start xmit */ | |
424efe9c | 708 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
709 | { |
710 | struct tun_struct *tun = netdev_priv(dev); | |
c8d68e6b | 711 | int txq = skb->queue_mapping; |
6e914fc7 | 712 | struct tun_file *tfile; |
1da177e4 | 713 | |
6e914fc7 | 714 | rcu_read_lock(); |
c8d68e6b JW |
715 | tfile = rcu_dereference(tun->tfiles[txq]); |
716 | ||
1da177e4 | 717 | /* Drop packet if interface is not attached */ |
c8d68e6b | 718 | if (txq >= tun->numqueues) |
1da177e4 LT |
719 | goto drop; |
720 | ||
6e914fc7 JW |
721 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
722 | ||
c8d68e6b JW |
723 | BUG_ON(!tfile); |
724 | ||
f271b2cc MK |
725 | /* Drop if the filter does not like it. |
726 | * This is a noop if the filter is disabled. | |
727 | * Filter can be enabled only for the TAP devices. */ | |
728 | if (!check_filter(&tun->txflt, skb)) | |
729 | goto drop; | |
730 | ||
54f968d6 JW |
731 | if (tfile->socket.sk->sk_filter && |
732 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
733 | goto drop; |
734 | ||
36fe8c09 | 735 | /* Limit the number of packets queued by dividing txq length with the |
c8d68e6b JW |
736 | * number of queues. |
737 | */ | |
54f968d6 | 738 | if (skb_queue_len(&tfile->socket.sk->sk_receive_queue) |
5d097109 MT |
739 | >= dev->tx_queue_len / tun->numqueues) |
740 | goto drop; | |
1da177e4 | 741 | |
0110d6f2 MT |
742 | /* Orphan the skb - required as we might hang on to it |
743 | * for indefinite time. */ | |
868eefeb MT |
744 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
745 | goto drop; | |
0110d6f2 MT |
746 | skb_orphan(skb); |
747 | ||
f8af75f3 ED |
748 | nf_reset(skb); |
749 | ||
f271b2cc | 750 | /* Enqueue packet */ |
54f968d6 | 751 | skb_queue_tail(&tfile->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
752 | |
753 | /* Notify and wake up reader process */ | |
54f968d6 JW |
754 | if (tfile->flags & TUN_FASYNC) |
755 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
756 | wake_up_interruptible_poll(&tfile->wq.wait, POLLIN | | |
05c2828c | 757 | POLLRDNORM | POLLRDBAND); |
6e914fc7 JW |
758 | |
759 | rcu_read_unlock(); | |
6ed10654 | 760 | return NETDEV_TX_OK; |
1da177e4 LT |
761 | |
762 | drop: | |
09f75cd7 | 763 | dev->stats.tx_dropped++; |
149d36f7 | 764 | skb_tx_error(skb); |
1da177e4 | 765 | kfree_skb(skb); |
6e914fc7 | 766 | rcu_read_unlock(); |
6ed10654 | 767 | return NETDEV_TX_OK; |
1da177e4 LT |
768 | } |
769 | ||
f271b2cc | 770 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 771 | { |
f271b2cc MK |
772 | /* |
773 | * This callback is supposed to deal with mc filter in | |
774 | * _rx_ path and has nothing to do with the _tx_ path. | |
775 | * In rx path we always accept everything userspace gives us. | |
776 | */ | |
1da177e4 LT |
777 | } |
778 | ||
4885a504 ES |
779 | #define MIN_MTU 68 |
780 | #define MAX_MTU 65535 | |
781 | ||
782 | static int | |
783 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
784 | { | |
785 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
786 | return -EINVAL; | |
787 | dev->mtu = new_mtu; | |
788 | return 0; | |
789 | } | |
790 | ||
c8f44aff MM |
791 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
792 | netdev_features_t features) | |
88255375 MM |
793 | { |
794 | struct tun_struct *tun = netdev_priv(dev); | |
795 | ||
796 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
797 | } | |
bebd097a NH |
798 | #ifdef CONFIG_NET_POLL_CONTROLLER |
799 | static void tun_poll_controller(struct net_device *dev) | |
800 | { | |
801 | /* | |
802 | * Tun only receives frames when: | |
803 | * 1) the char device endpoint gets data from user space | |
804 | * 2) the tun socket gets a sendmsg call from user space | |
805 | * Since both of those are syncronous operations, we are guaranteed | |
806 | * never to have pending data when we poll for it | |
807 | * so theres nothing to do here but return. | |
808 | * We need this though so netpoll recognizes us as an interface that | |
809 | * supports polling, which enables bridge devices in virt setups to | |
810 | * still use netconsole | |
811 | */ | |
812 | return; | |
813 | } | |
814 | #endif | |
758e43b7 | 815 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 816 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
817 | .ndo_open = tun_net_open, |
818 | .ndo_stop = tun_net_close, | |
00829823 | 819 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 820 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 821 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 822 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
823 | #ifdef CONFIG_NET_POLL_CONTROLLER |
824 | .ndo_poll_controller = tun_poll_controller, | |
825 | #endif | |
758e43b7 SH |
826 | }; |
827 | ||
828 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 829 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
830 | .ndo_open = tun_net_open, |
831 | .ndo_stop = tun_net_close, | |
00829823 | 832 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 833 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 834 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 835 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
836 | .ndo_set_mac_address = eth_mac_addr, |
837 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 838 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
839 | #ifdef CONFIG_NET_POLL_CONTROLLER |
840 | .ndo_poll_controller = tun_poll_controller, | |
841 | #endif | |
758e43b7 SH |
842 | }; |
843 | ||
944a1376 | 844 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
845 | { |
846 | int i; | |
847 | ||
96442e42 JW |
848 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
849 | INIT_HLIST_HEAD(&tun->flows[i]); | |
850 | ||
851 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
852 | setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); | |
853 | mod_timer(&tun->flow_gc_timer, | |
854 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
855 | } |
856 | ||
857 | static void tun_flow_uninit(struct tun_struct *tun) | |
858 | { | |
859 | del_timer_sync(&tun->flow_gc_timer); | |
860 | tun_flow_flush(tun); | |
96442e42 JW |
861 | } |
862 | ||
1da177e4 LT |
863 | /* Initialize net device. */ |
864 | static void tun_net_init(struct net_device *dev) | |
865 | { | |
866 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 867 | |
1da177e4 LT |
868 | switch (tun->flags & TUN_TYPE_MASK) { |
869 | case TUN_TUN_DEV: | |
758e43b7 SH |
870 | dev->netdev_ops = &tun_netdev_ops; |
871 | ||
1da177e4 LT |
872 | /* Point-to-Point TUN Device */ |
873 | dev->hard_header_len = 0; | |
874 | dev->addr_len = 0; | |
875 | dev->mtu = 1500; | |
876 | ||
877 | /* Zero header length */ | |
6aa20a22 | 878 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
879 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
880 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
881 | break; | |
882 | ||
883 | case TUN_TAP_DEV: | |
7a0a9608 | 884 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 885 | /* Ethernet TAP Device */ |
1da177e4 | 886 | ether_setup(dev); |
550fd08c | 887 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 888 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 889 | |
f2cedb63 | 890 | eth_hw_addr_random(dev); |
36226a8d | 891 | |
1da177e4 LT |
892 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
893 | break; | |
894 | } | |
895 | } | |
896 | ||
897 | /* Character device part */ | |
898 | ||
899 | /* Poll */ | |
c8d68e6b | 900 | static unsigned int tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 901 | { |
b2430de3 EB |
902 | struct tun_file *tfile = file->private_data; |
903 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 904 | struct sock *sk; |
33dccbb0 | 905 | unsigned int mask = 0; |
1da177e4 LT |
906 | |
907 | if (!tun) | |
eac9e902 | 908 | return POLLERR; |
1da177e4 | 909 | |
54f968d6 | 910 | sk = tfile->socket.sk; |
3c8a9c63 | 911 | |
6b8a66ee | 912 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 913 | |
54f968d6 | 914 | poll_wait(file, &tfile->wq.wait, wait); |
6aa20a22 | 915 | |
89f56d1e | 916 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
917 | mask |= POLLIN | POLLRDNORM; |
918 | ||
33dccbb0 HX |
919 | if (sock_writeable(sk) || |
920 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
921 | sock_writeable(sk))) | |
922 | mask |= POLLOUT | POLLWRNORM; | |
923 | ||
c70f1829 EB |
924 | if (tun->dev->reg_state != NETREG_REGISTERED) |
925 | mask = POLLERR; | |
926 | ||
631ab46b | 927 | tun_put(tun); |
1da177e4 LT |
928 | return mask; |
929 | } | |
930 | ||
f42157cb RR |
931 | /* prepad is the amount to reserve at front. len is length after that. |
932 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 933 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 934 | size_t prepad, size_t len, |
935 | size_t linear, int noblock) | |
f42157cb | 936 | { |
54f968d6 | 937 | struct sock *sk = tfile->socket.sk; |
f42157cb | 938 | struct sk_buff *skb; |
33dccbb0 | 939 | int err; |
f42157cb RR |
940 | |
941 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 942 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 943 | linear = len; |
f42157cb | 944 | |
33dccbb0 HX |
945 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
946 | &err); | |
f42157cb | 947 | if (!skb) |
33dccbb0 | 948 | return ERR_PTR(err); |
f42157cb RR |
949 | |
950 | skb_reserve(skb, prepad); | |
951 | skb_put(skb, linear); | |
33dccbb0 HX |
952 | skb->data_len = len - linear; |
953 | skb->len += len - linear; | |
f42157cb RR |
954 | |
955 | return skb; | |
956 | } | |
957 | ||
0690899b MT |
958 | /* set skb frags from iovec, this can move to core network code for reuse */ |
959 | static int zerocopy_sg_from_iovec(struct sk_buff *skb, const struct iovec *from, | |
960 | int offset, size_t count) | |
961 | { | |
962 | int len = iov_length(from, count) - offset; | |
963 | int copy = skb_headlen(skb); | |
964 | int size, offset1 = 0; | |
965 | int i = 0; | |
966 | ||
967 | /* Skip over from offset */ | |
968 | while (count && (offset >= from->iov_len)) { | |
969 | offset -= from->iov_len; | |
970 | ++from; | |
971 | --count; | |
972 | } | |
973 | ||
974 | /* copy up to skb headlen */ | |
975 | while (count && (copy > 0)) { | |
976 | size = min_t(unsigned int, copy, from->iov_len - offset); | |
977 | if (copy_from_user(skb->data + offset1, from->iov_base + offset, | |
978 | size)) | |
979 | return -EFAULT; | |
980 | if (copy > size) { | |
981 | ++from; | |
982 | --count; | |
983 | offset = 0; | |
984 | } else | |
985 | offset += size; | |
986 | copy -= size; | |
987 | offset1 += size; | |
988 | } | |
989 | ||
990 | if (len == offset1) | |
991 | return 0; | |
992 | ||
993 | while (count--) { | |
994 | struct page *page[MAX_SKB_FRAGS]; | |
995 | int num_pages; | |
996 | unsigned long base; | |
997 | unsigned long truesize; | |
998 | ||
999 | len = from->iov_len - offset; | |
1000 | if (!len) { | |
1001 | offset = 0; | |
1002 | ++from; | |
1003 | continue; | |
1004 | } | |
1005 | base = (unsigned long)from->iov_base + offset; | |
1006 | size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT; | |
1007 | if (i + size > MAX_SKB_FRAGS) | |
1008 | return -EMSGSIZE; | |
1009 | num_pages = get_user_pages_fast(base, size, 0, &page[i]); | |
1010 | if (num_pages != size) { | |
7e24bfbe MT |
1011 | int j; |
1012 | ||
1013 | for (j = 0; j < num_pages; j++) | |
1014 | put_page(page[i + j]); | |
0690899b MT |
1015 | return -EFAULT; |
1016 | } | |
1017 | truesize = size * PAGE_SIZE; | |
1018 | skb->data_len += len; | |
1019 | skb->len += len; | |
1020 | skb->truesize += truesize; | |
1021 | atomic_add(truesize, &skb->sk->sk_wmem_alloc); | |
1022 | while (len) { | |
1023 | int off = base & ~PAGE_MASK; | |
1024 | int size = min_t(int, len, PAGE_SIZE - off); | |
1025 | __skb_fill_page_desc(skb, i, page[i], off, size); | |
1026 | skb_shinfo(skb)->nr_frags++; | |
1027 | /* increase sk_wmem_alloc */ | |
1028 | base += size; | |
1029 | len -= size; | |
1030 | i++; | |
1031 | } | |
1032 | offset = 0; | |
1033 | ++from; | |
1034 | } | |
1035 | return 0; | |
1036 | } | |
1037 | ||
88529176 JW |
1038 | static unsigned long iov_pages(const struct iovec *iv, int offset, |
1039 | unsigned long nr_segs) | |
1040 | { | |
1041 | unsigned long seg, base; | |
1042 | int pages = 0, len, size; | |
1043 | ||
1044 | while (nr_segs && (offset >= iv->iov_len)) { | |
1045 | offset -= iv->iov_len; | |
1046 | ++iv; | |
1047 | --nr_segs; | |
1048 | } | |
1049 | ||
1050 | for (seg = 0; seg < nr_segs; seg++) { | |
1051 | base = (unsigned long)iv[seg].iov_base + offset; | |
1052 | len = iv[seg].iov_len - offset; | |
1053 | size = ((base & ~PAGE_MASK) + len + ~PAGE_MASK) >> PAGE_SHIFT; | |
1054 | pages += size; | |
1055 | offset = 0; | |
1056 | } | |
1057 | ||
1058 | return pages; | |
1059 | } | |
1060 | ||
1da177e4 | 1061 | /* Get packet from user space buffer */ |
54f968d6 JW |
1062 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
1063 | void *msg_control, const struct iovec *iv, | |
1064 | size_t total_len, size_t count, int noblock) | |
1da177e4 | 1065 | { |
09640e63 | 1066 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1067 | struct sk_buff *skb; |
3dd5c330 | 1068 | size_t len = total_len, align = NET_SKB_PAD, linear; |
f43798c2 | 1069 | struct virtio_net_hdr gso = { 0 }; |
6f26c9a7 | 1070 | int offset = 0; |
0690899b MT |
1071 | int copylen; |
1072 | bool zerocopy = false; | |
1073 | int err; | |
49974420 | 1074 | u32 rxhash; |
1da177e4 LT |
1075 | |
1076 | if (!(tun->flags & TUN_NO_PI)) { | |
0690899b | 1077 | if ((len -= sizeof(pi)) > total_len) |
1da177e4 LT |
1078 | return -EINVAL; |
1079 | ||
6f26c9a7 | 1080 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 1081 | return -EFAULT; |
6f26c9a7 | 1082 | offset += sizeof(pi); |
1da177e4 LT |
1083 | } |
1084 | ||
f43798c2 | 1085 | if (tun->flags & TUN_VNET_HDR) { |
0690899b | 1086 | if ((len -= tun->vnet_hdr_sz) > total_len) |
f43798c2 RR |
1087 | return -EINVAL; |
1088 | ||
6f26c9a7 | 1089 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
1090 | return -EFAULT; |
1091 | ||
4909122f HX |
1092 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
1093 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
1094 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
1095 | ||
f43798c2 RR |
1096 | if (gso.hdr_len > len) |
1097 | return -EINVAL; | |
d9d52b51 | 1098 | offset += tun->vnet_hdr_sz; |
f43798c2 RR |
1099 | } |
1100 | ||
e01bf1c8 | 1101 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
a504b86e | 1102 | align += NET_IP_ALIGN; |
0eca93bc HX |
1103 | if (unlikely(len < ETH_HLEN || |
1104 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
1105 | return -EINVAL; |
1106 | } | |
6aa20a22 | 1107 | |
88529176 JW |
1108 | if (msg_control) { |
1109 | /* There are 256 bytes to be copied in skb, so there is | |
1110 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1111 | * The rest of the buffer is mapped from userspace. |
1112 | */ | |
88529176 | 1113 | copylen = gso.hdr_len ? gso.hdr_len : GOODCOPY_LEN; |
3dd5c330 | 1114 | linear = copylen; |
88529176 JW |
1115 | if (iov_pages(iv, offset + copylen, count) <= MAX_SKB_FRAGS) |
1116 | zerocopy = true; | |
1117 | } | |
1118 | ||
1119 | if (!zerocopy) { | |
0690899b | 1120 | copylen = len; |
3dd5c330 JW |
1121 | linear = gso.hdr_len; |
1122 | } | |
0690899b | 1123 | |
3dd5c330 | 1124 | skb = tun_alloc_skb(tfile, align, copylen, linear, noblock); |
33dccbb0 HX |
1125 | if (IS_ERR(skb)) { |
1126 | if (PTR_ERR(skb) != -EAGAIN) | |
1127 | tun->dev->stats.rx_dropped++; | |
1128 | return PTR_ERR(skb); | |
1da177e4 LT |
1129 | } |
1130 | ||
0690899b MT |
1131 | if (zerocopy) |
1132 | err = zerocopy_sg_from_iovec(skb, iv, offset, count); | |
88529176 | 1133 | else { |
0690899b | 1134 | err = skb_copy_datagram_from_iovec(skb, 0, iv, offset, len); |
88529176 JW |
1135 | if (!err && msg_control) { |
1136 | struct ubuf_info *uarg = msg_control; | |
1137 | uarg->callback(uarg, false); | |
1138 | } | |
1139 | } | |
0690899b MT |
1140 | |
1141 | if (err) { | |
09f75cd7 | 1142 | tun->dev->stats.rx_dropped++; |
8f22757e | 1143 | kfree_skb(skb); |
1da177e4 | 1144 | return -EFAULT; |
8f22757e | 1145 | } |
1da177e4 | 1146 | |
f43798c2 RR |
1147 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
1148 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
1149 | gso.csum_offset)) { | |
1150 | tun->dev->stats.rx_frame_errors++; | |
1151 | kfree_skb(skb); | |
1152 | return -EINVAL; | |
1153 | } | |
88255375 | 1154 | } |
f43798c2 | 1155 | |
1da177e4 LT |
1156 | switch (tun->flags & TUN_TYPE_MASK) { |
1157 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
1158 | if (tun->flags & TUN_NO_PI) { |
1159 | switch (skb->data[0] & 0xf0) { | |
1160 | case 0x40: | |
1161 | pi.proto = htons(ETH_P_IP); | |
1162 | break; | |
1163 | case 0x60: | |
1164 | pi.proto = htons(ETH_P_IPV6); | |
1165 | break; | |
1166 | default: | |
1167 | tun->dev->stats.rx_dropped++; | |
1168 | kfree_skb(skb); | |
1169 | return -EINVAL; | |
1170 | } | |
1171 | } | |
1172 | ||
459a98ed | 1173 | skb_reset_mac_header(skb); |
1da177e4 | 1174 | skb->protocol = pi.proto; |
4c13eb66 | 1175 | skb->dev = tun->dev; |
1da177e4 LT |
1176 | break; |
1177 | case TUN_TAP_DEV: | |
1178 | skb->protocol = eth_type_trans(skb, tun->dev); | |
1179 | break; | |
6403eab1 | 1180 | } |
1da177e4 | 1181 | |
f43798c2 RR |
1182 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
1183 | pr_debug("GSO!\n"); | |
1184 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1185 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
c9af6db4 | 1186 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
f43798c2 RR |
1187 | break; |
1188 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
c9af6db4 | 1189 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
f43798c2 | 1190 | break; |
e36aa25a | 1191 | case VIRTIO_NET_HDR_GSO_UDP: |
c9af6db4 | 1192 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
e36aa25a | 1193 | break; |
f43798c2 RR |
1194 | default: |
1195 | tun->dev->stats.rx_frame_errors++; | |
1196 | kfree_skb(skb); | |
1197 | return -EINVAL; | |
1198 | } | |
1199 | ||
1200 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
c9af6db4 | 1201 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
f43798c2 RR |
1202 | |
1203 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
1204 | if (skb_shinfo(skb)->gso_size == 0) { | |
1205 | tun->dev->stats.rx_frame_errors++; | |
1206 | kfree_skb(skb); | |
1207 | return -EINVAL; | |
1208 | } | |
1209 | ||
1210 | /* Header must be checked, and gso_segs computed. */ | |
1211 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1212 | skb_shinfo(skb)->gso_segs = 0; | |
1213 | } | |
6aa20a22 | 1214 | |
0690899b MT |
1215 | /* copy skb_ubuf_info for callback when skb has no error */ |
1216 | if (zerocopy) { | |
1217 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1218 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
c9af6db4 | 1219 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
0690899b MT |
1220 | } |
1221 | ||
76fe4581 | 1222 | skb_reset_network_header(skb); |
40893fd0 | 1223 | skb_probe_transport_header(skb, 0); |
38502af7 | 1224 | |
49974420 | 1225 | rxhash = skb_get_rxhash(skb); |
1da177e4 | 1226 | netif_rx_ni(skb); |
6aa20a22 | 1227 | |
09f75cd7 JG |
1228 | tun->dev->stats.rx_packets++; |
1229 | tun->dev->stats.rx_bytes += len; | |
1da177e4 | 1230 | |
9e85722d | 1231 | tun_flow_update(tun, rxhash, tfile); |
0690899b | 1232 | return total_len; |
6aa20a22 | 1233 | } |
1da177e4 | 1234 | |
ee0b3e67 BP |
1235 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
1236 | unsigned long count, loff_t pos) | |
1da177e4 | 1237 | { |
33dccbb0 | 1238 | struct file *file = iocb->ki_filp; |
ab46d779 | 1239 | struct tun_struct *tun = tun_get(file); |
54f968d6 | 1240 | struct tun_file *tfile = file->private_data; |
631ab46b | 1241 | ssize_t result; |
1da177e4 LT |
1242 | |
1243 | if (!tun) | |
1244 | return -EBADFD; | |
1245 | ||
6b8a66ee | 1246 | tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count); |
1da177e4 | 1247 | |
54f968d6 JW |
1248 | result = tun_get_user(tun, tfile, NULL, iv, iov_length(iv, count), |
1249 | count, file->f_flags & O_NONBLOCK); | |
631ab46b EB |
1250 | |
1251 | tun_put(tun); | |
1252 | return result; | |
1da177e4 LT |
1253 | } |
1254 | ||
1da177e4 | 1255 | /* Put packet to the user space buffer */ |
6f7c156c | 1256 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 1257 | struct tun_file *tfile, |
6f7c156c | 1258 | struct sk_buff *skb, |
1259 | const struct iovec *iv, int len) | |
1da177e4 LT |
1260 | { |
1261 | struct tun_pi pi = { 0, skb->protocol }; | |
1262 | ssize_t total = 0; | |
1263 | ||
1264 | if (!(tun->flags & TUN_NO_PI)) { | |
1265 | if ((len -= sizeof(pi)) < 0) | |
1266 | return -EINVAL; | |
1267 | ||
1268 | if (len < skb->len) { | |
1269 | /* Packet will be striped */ | |
1270 | pi.flags |= TUN_PKT_STRIP; | |
1271 | } | |
6aa20a22 | 1272 | |
43b39dcd | 1273 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
1274 | return -EFAULT; |
1275 | total += sizeof(pi); | |
6aa20a22 | 1276 | } |
1da177e4 | 1277 | |
f43798c2 RR |
1278 | if (tun->flags & TUN_VNET_HDR) { |
1279 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
d9d52b51 | 1280 | if ((len -= tun->vnet_hdr_sz) < 0) |
f43798c2 RR |
1281 | return -EINVAL; |
1282 | ||
1283 | if (skb_is_gso(skb)) { | |
1284 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1285 | ||
1286 | /* This is a hint as to how much should be linear. */ | |
1287 | gso.hdr_len = skb_headlen(skb); | |
1288 | gso.gso_size = sinfo->gso_size; | |
1289 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1290 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1291 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1292 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e36aa25a SS |
1293 | else if (sinfo->gso_type & SKB_GSO_UDP) |
1294 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
ef3db4a5 | 1295 | else { |
6b8a66ee | 1296 | pr_err("unexpected GSO type: " |
ef3db4a5 MT |
1297 | "0x%x, gso_size %d, hdr_len %d\n", |
1298 | sinfo->gso_type, gso.gso_size, | |
1299 | gso.hdr_len); | |
1300 | print_hex_dump(KERN_ERR, "tun: ", | |
1301 | DUMP_PREFIX_NONE, | |
1302 | 16, 1, skb->head, | |
1303 | min((int)gso.hdr_len, 64), true); | |
1304 | WARN_ON_ONCE(1); | |
1305 | return -EINVAL; | |
1306 | } | |
f43798c2 RR |
1307 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
1308 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1309 | } else | |
1310 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1311 | ||
1312 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1313 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 1314 | gso.csum_start = skb_checksum_start_offset(skb); |
f43798c2 | 1315 | gso.csum_offset = skb->csum_offset; |
10a8d94a JW |
1316 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
1317 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
f43798c2 RR |
1318 | } /* else everything is zero */ |
1319 | ||
43b39dcd MT |
1320 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
1321 | sizeof(gso)))) | |
f43798c2 | 1322 | return -EFAULT; |
d9d52b51 | 1323 | total += tun->vnet_hdr_sz; |
f43798c2 RR |
1324 | } |
1325 | ||
1da177e4 LT |
1326 | len = min_t(int, skb->len, len); |
1327 | ||
43b39dcd | 1328 | skb_copy_datagram_const_iovec(skb, 0, iv, total, len); |
05c2828c | 1329 | total += skb->len; |
1da177e4 | 1330 | |
09f75cd7 JG |
1331 | tun->dev->stats.tx_packets++; |
1332 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
1333 | |
1334 | return total; | |
1335 | } | |
1336 | ||
54f968d6 | 1337 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
05c2828c MT |
1338 | struct kiocb *iocb, const struct iovec *iv, |
1339 | ssize_t len, int noblock) | |
1da177e4 | 1340 | { |
1da177e4 LT |
1341 | DECLARE_WAITQUEUE(wait, current); |
1342 | struct sk_buff *skb; | |
05c2828c | 1343 | ssize_t ret = 0; |
1da177e4 | 1344 | |
3872baf6 | 1345 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 1346 | |
61a5ff15 | 1347 | if (unlikely(!noblock)) |
54f968d6 | 1348 | add_wait_queue(&tfile->wq.wait, &wait); |
1da177e4 | 1349 | while (len) { |
1da177e4 LT |
1350 | current->state = TASK_INTERRUPTIBLE; |
1351 | ||
1352 | /* Read frames from the queue */ | |
54f968d6 | 1353 | if (!(skb = skb_dequeue(&tfile->socket.sk->sk_receive_queue))) { |
05c2828c | 1354 | if (noblock) { |
1da177e4 LT |
1355 | ret = -EAGAIN; |
1356 | break; | |
1357 | } | |
1358 | if (signal_pending(current)) { | |
1359 | ret = -ERESTARTSYS; | |
1360 | break; | |
1361 | } | |
c70f1829 EB |
1362 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
1363 | ret = -EIO; | |
1364 | break; | |
1365 | } | |
1da177e4 LT |
1366 | |
1367 | /* Nothing to read, let's sleep */ | |
1368 | schedule(); | |
1369 | continue; | |
1370 | } | |
1da177e4 | 1371 | |
54f968d6 | 1372 | ret = tun_put_user(tun, tfile, skb, iv, len); |
f271b2cc MK |
1373 | kfree_skb(skb); |
1374 | break; | |
1da177e4 LT |
1375 | } |
1376 | ||
1377 | current->state = TASK_RUNNING; | |
61a5ff15 | 1378 | if (unlikely(!noblock)) |
54f968d6 | 1379 | remove_wait_queue(&tfile->wq.wait, &wait); |
1da177e4 | 1380 | |
05c2828c MT |
1381 | return ret; |
1382 | } | |
1383 | ||
1384 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
1385 | unsigned long count, loff_t pos) | |
1386 | { | |
1387 | struct file *file = iocb->ki_filp; | |
1388 | struct tun_file *tfile = file->private_data; | |
1389 | struct tun_struct *tun = __tun_get(tfile); | |
1390 | ssize_t len, ret; | |
1391 | ||
1392 | if (!tun) | |
1393 | return -EBADFD; | |
1394 | len = iov_length(iv, count); | |
1395 | if (len < 0) { | |
1396 | ret = -EINVAL; | |
1397 | goto out; | |
1398 | } | |
1399 | ||
54f968d6 JW |
1400 | ret = tun_do_read(tun, tfile, iocb, iv, len, |
1401 | file->f_flags & O_NONBLOCK); | |
05c2828c | 1402 | ret = min_t(ssize_t, ret, len); |
631ab46b EB |
1403 | out: |
1404 | tun_put(tun); | |
1da177e4 LT |
1405 | return ret; |
1406 | } | |
1407 | ||
96442e42 JW |
1408 | static void tun_free_netdev(struct net_device *dev) |
1409 | { | |
1410 | struct tun_struct *tun = netdev_priv(dev); | |
1411 | ||
4008e97f | 1412 | BUG_ON(!(list_empty(&tun->disabled))); |
96442e42 | 1413 | tun_flow_uninit(tun); |
5dbbaf2d | 1414 | security_tun_dev_free_security(tun->security); |
96442e42 JW |
1415 | free_netdev(dev); |
1416 | } | |
1417 | ||
1da177e4 LT |
1418 | static void tun_setup(struct net_device *dev) |
1419 | { | |
1420 | struct tun_struct *tun = netdev_priv(dev); | |
1421 | ||
0625c883 EB |
1422 | tun->owner = INVALID_UID; |
1423 | tun->group = INVALID_GID; | |
1da177e4 | 1424 | |
1da177e4 | 1425 | dev->ethtool_ops = &tun_ethtool_ops; |
96442e42 | 1426 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
1427 | } |
1428 | ||
f019a7a5 EB |
1429 | /* Trivial set of netlink ops to allow deleting tun or tap |
1430 | * device with netlink. | |
1431 | */ | |
1432 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1433 | { | |
1434 | return -EINVAL; | |
1435 | } | |
1436 | ||
1437 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1438 | .kind = DRV_NAME, | |
1439 | .priv_size = sizeof(struct tun_struct), | |
1440 | .setup = tun_setup, | |
1441 | .validate = tun_validate, | |
1442 | }; | |
1443 | ||
33dccbb0 HX |
1444 | static void tun_sock_write_space(struct sock *sk) |
1445 | { | |
54f968d6 | 1446 | struct tun_file *tfile; |
43815482 | 1447 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1448 | |
1449 | if (!sock_writeable(sk)) | |
1450 | return; | |
1451 | ||
33dccbb0 HX |
1452 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
1453 | return; | |
1454 | ||
43815482 ED |
1455 | wqueue = sk_sleep(sk); |
1456 | if (wqueue && waitqueue_active(wqueue)) | |
1457 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1458 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1459 | |
54f968d6 JW |
1460 | tfile = container_of(sk, struct tun_file, sk); |
1461 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
1462 | } |
1463 | ||
05c2828c MT |
1464 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
1465 | struct msghdr *m, size_t total_len) | |
1466 | { | |
54f968d6 JW |
1467 | int ret; |
1468 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1469 | struct tun_struct *tun = __tun_get(tfile); | |
1470 | ||
1471 | if (!tun) | |
1472 | return -EBADFD; | |
54f968d6 JW |
1473 | ret = tun_get_user(tun, tfile, m->msg_control, m->msg_iov, total_len, |
1474 | m->msg_iovlen, m->msg_flags & MSG_DONTWAIT); | |
1475 | tun_put(tun); | |
1476 | return ret; | |
05c2828c MT |
1477 | } |
1478 | ||
54f968d6 | 1479 | |
05c2828c MT |
1480 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, |
1481 | struct msghdr *m, size_t total_len, | |
1482 | int flags) | |
1483 | { | |
54f968d6 JW |
1484 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
1485 | struct tun_struct *tun = __tun_get(tfile); | |
05c2828c | 1486 | int ret; |
54f968d6 JW |
1487 | |
1488 | if (!tun) | |
1489 | return -EBADFD; | |
1490 | ||
3811ae76 G |
1491 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC)) { |
1492 | ret = -EINVAL; | |
1493 | goto out; | |
1494 | } | |
54f968d6 | 1495 | ret = tun_do_read(tun, tfile, iocb, m->msg_iov, total_len, |
05c2828c MT |
1496 | flags & MSG_DONTWAIT); |
1497 | if (ret > total_len) { | |
1498 | m->msg_flags |= MSG_TRUNC; | |
1499 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1500 | } | |
3811ae76 | 1501 | out: |
54f968d6 | 1502 | tun_put(tun); |
05c2828c MT |
1503 | return ret; |
1504 | } | |
1505 | ||
1ab5ecb9 SK |
1506 | static int tun_release(struct socket *sock) |
1507 | { | |
1508 | if (sock->sk) | |
1509 | sock_put(sock->sk); | |
1510 | return 0; | |
1511 | } | |
1512 | ||
05c2828c MT |
1513 | /* Ops structure to mimic raw sockets with tun */ |
1514 | static const struct proto_ops tun_socket_ops = { | |
1515 | .sendmsg = tun_sendmsg, | |
1516 | .recvmsg = tun_recvmsg, | |
1ab5ecb9 | 1517 | .release = tun_release, |
05c2828c MT |
1518 | }; |
1519 | ||
33dccbb0 HX |
1520 | static struct proto tun_proto = { |
1521 | .name = "tun", | |
1522 | .owner = THIS_MODULE, | |
54f968d6 | 1523 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 1524 | }; |
f019a7a5 | 1525 | |
980c9e8c DW |
1526 | static int tun_flags(struct tun_struct *tun) |
1527 | { | |
1528 | int flags = 0; | |
1529 | ||
1530 | if (tun->flags & TUN_TUN_DEV) | |
1531 | flags |= IFF_TUN; | |
1532 | else | |
1533 | flags |= IFF_TAP; | |
1534 | ||
1535 | if (tun->flags & TUN_NO_PI) | |
1536 | flags |= IFF_NO_PI; | |
1537 | ||
5d097109 MT |
1538 | /* This flag has no real effect. We track the value for backwards |
1539 | * compatibility. | |
1540 | */ | |
980c9e8c DW |
1541 | if (tun->flags & TUN_ONE_QUEUE) |
1542 | flags |= IFF_ONE_QUEUE; | |
1543 | ||
1544 | if (tun->flags & TUN_VNET_HDR) | |
1545 | flags |= IFF_VNET_HDR; | |
1546 | ||
c8d68e6b JW |
1547 | if (tun->flags & TUN_TAP_MQ) |
1548 | flags |= IFF_MULTI_QUEUE; | |
1549 | ||
274038f8 PE |
1550 | if (tun->flags & TUN_PERSIST) |
1551 | flags |= IFF_PERSIST; | |
1552 | ||
980c9e8c DW |
1553 | return flags; |
1554 | } | |
1555 | ||
1556 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1557 | char *buf) | |
1558 | { | |
1559 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1560 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1561 | } | |
1562 | ||
1563 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1564 | char *buf) | |
1565 | { | |
1566 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1567 | return uid_valid(tun->owner)? |
1568 | sprintf(buf, "%u\n", | |
1569 | from_kuid_munged(current_user_ns(), tun->owner)): | |
1570 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1571 | } |
1572 | ||
1573 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1574 | char *buf) | |
1575 | { | |
1576 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1577 | return gid_valid(tun->group) ? |
1578 | sprintf(buf, "%u\n", | |
1579 | from_kgid_munged(current_user_ns(), tun->group)): | |
1580 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1581 | } |
1582 | ||
1583 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1584 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1585 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1586 | ||
d647a591 | 1587 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
1588 | { |
1589 | struct tun_struct *tun; | |
54f968d6 | 1590 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
1591 | struct net_device *dev; |
1592 | int err; | |
1593 | ||
7c0c3b1a JW |
1594 | if (tfile->detached) |
1595 | return -EINVAL; | |
1596 | ||
74a3e5a7 EB |
1597 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1598 | if (dev) { | |
f85ba780 DW |
1599 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1600 | return -EBUSY; | |
74a3e5a7 EB |
1601 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1602 | tun = netdev_priv(dev); | |
1603 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1604 | tun = netdev_priv(dev); | |
1605 | else | |
1606 | return -EINVAL; | |
1607 | ||
8e6d91ae JW |
1608 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
1609 | !!(tun->flags & TUN_TAP_MQ)) | |
1610 | return -EINVAL; | |
1611 | ||
cde8b15f | 1612 | if (tun_not_capable(tun)) |
2b980dbd | 1613 | return -EPERM; |
5dbbaf2d | 1614 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
1615 | if (err < 0) |
1616 | return err; | |
1617 | ||
a7385ba2 EB |
1618 | err = tun_attach(tun, file); |
1619 | if (err < 0) | |
1620 | return err; | |
4008e97f JW |
1621 | |
1622 | if (tun->flags & TUN_TAP_MQ && | |
e8dbad66 JW |
1623 | (tun->numqueues + tun->numdisabled > 1)) { |
1624 | /* One or more queue has already been attached, no need | |
1625 | * to initialize the device again. | |
1626 | */ | |
1627 | return 0; | |
1628 | } | |
6aa20a22 | 1629 | } |
1da177e4 LT |
1630 | else { |
1631 | char *name; | |
1632 | unsigned long flags = 0; | |
edfb6a14 JW |
1633 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
1634 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 1635 | |
c260b772 | 1636 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 1637 | return -EPERM; |
2b980dbd PM |
1638 | err = security_tun_dev_create(); |
1639 | if (err < 0) | |
1640 | return err; | |
ca6bb5d7 | 1641 | |
1da177e4 LT |
1642 | /* Set dev type */ |
1643 | if (ifr->ifr_flags & IFF_TUN) { | |
1644 | /* TUN device */ | |
1645 | flags |= TUN_TUN_DEV; | |
1646 | name = "tun%d"; | |
1647 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1648 | /* TAP device */ | |
1649 | flags |= TUN_TAP_DEV; | |
1650 | name = "tap%d"; | |
6aa20a22 | 1651 | } else |
36989b90 | 1652 | return -EINVAL; |
6aa20a22 | 1653 | |
1da177e4 LT |
1654 | if (*ifr->ifr_name) |
1655 | name = ifr->ifr_name; | |
1656 | ||
c8d68e6b | 1657 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
edfb6a14 JW |
1658 | tun_setup, queues, queues); |
1659 | ||
1da177e4 LT |
1660 | if (!dev) |
1661 | return -ENOMEM; | |
1662 | ||
fc54c658 | 1663 | dev_net_set(dev, net); |
f019a7a5 | 1664 | dev->rtnl_link_ops = &tun_link_ops; |
758e43b7 | 1665 | |
1da177e4 LT |
1666 | tun = netdev_priv(dev); |
1667 | tun->dev = dev; | |
1668 | tun->flags = flags; | |
f271b2cc | 1669 | tun->txflt.count = 0; |
d9d52b51 | 1670 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 1671 | |
54f968d6 JW |
1672 | tun->filter_attached = false; |
1673 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
33dccbb0 | 1674 | |
96442e42 JW |
1675 | spin_lock_init(&tun->lock); |
1676 | ||
5dbbaf2d PM |
1677 | err = security_tun_dev_alloc_security(&tun->security); |
1678 | if (err < 0) | |
1679 | goto err_free_dev; | |
2b980dbd | 1680 | |
1da177e4 | 1681 | tun_net_init(dev); |
944a1376 | 1682 | tun_flow_init(tun); |
96442e42 | 1683 | |
88255375 MM |
1684 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
1685 | TUN_USER_FEATURES; | |
1686 | dev->features = dev->hw_features; | |
c0317998 | 1687 | dev->vlan_features = dev->features; |
88255375 | 1688 | |
4008e97f | 1689 | INIT_LIST_HEAD(&tun->disabled); |
eb0fb363 JW |
1690 | err = tun_attach(tun, file); |
1691 | if (err < 0) | |
1692 | goto err_free_dev; | |
1693 | ||
1da177e4 LT |
1694 | err = register_netdevice(tun->dev); |
1695 | if (err < 0) | |
54f968d6 | 1696 | goto err_free_dev; |
9c3fea6a | 1697 | |
980c9e8c DW |
1698 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1699 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1700 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
6b8a66ee | 1701 | pr_err("Failed to create tun sysfs files\n"); |
1da177e4 LT |
1702 | } |
1703 | ||
af668b3c MT |
1704 | netif_carrier_on(tun->dev); |
1705 | ||
6b8a66ee | 1706 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 LT |
1707 | |
1708 | if (ifr->ifr_flags & IFF_NO_PI) | |
1709 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1710 | else |
1711 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 | 1712 | |
5d097109 MT |
1713 | /* This flag has no real effect. We track the value for backwards |
1714 | * compatibility. | |
1715 | */ | |
1da177e4 LT |
1716 | if (ifr->ifr_flags & IFF_ONE_QUEUE) |
1717 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1718 | else |
1719 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1720 | |
f43798c2 RR |
1721 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1722 | tun->flags |= TUN_VNET_HDR; | |
1723 | else | |
1724 | tun->flags &= ~TUN_VNET_HDR; | |
1725 | ||
c8d68e6b JW |
1726 | if (ifr->ifr_flags & IFF_MULTI_QUEUE) |
1727 | tun->flags |= TUN_TAP_MQ; | |
1728 | else | |
1729 | tun->flags &= ~TUN_TAP_MQ; | |
1730 | ||
e35259a9 MK |
1731 | /* Make sure persistent devices do not get stuck in |
1732 | * xoff state. | |
1733 | */ | |
1734 | if (netif_running(tun->dev)) | |
c8d68e6b | 1735 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 1736 | |
1da177e4 LT |
1737 | strcpy(ifr->ifr_name, tun->dev->name); |
1738 | return 0; | |
1739 | ||
1740 | err_free_dev: | |
1741 | free_netdev(dev); | |
1da177e4 LT |
1742 | return err; |
1743 | } | |
1744 | ||
9ce99cf6 | 1745 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 1746 | struct ifreq *ifr) |
e3b99556 | 1747 | { |
6b8a66ee | 1748 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1749 | |
1750 | strcpy(ifr->ifr_name, tun->dev->name); | |
1751 | ||
980c9e8c | 1752 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 1753 | |
e3b99556 MM |
1754 | } |
1755 | ||
5228ddc9 RR |
1756 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1757 | * privs required. */ | |
88255375 | 1758 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1759 | { |
c8f44aff | 1760 | netdev_features_t features = 0; |
5228ddc9 RR |
1761 | |
1762 | if (arg & TUN_F_CSUM) { | |
88255375 | 1763 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1764 | arg &= ~TUN_F_CSUM; |
1765 | ||
1766 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1767 | if (arg & TUN_F_TSO_ECN) { | |
1768 | features |= NETIF_F_TSO_ECN; | |
1769 | arg &= ~TUN_F_TSO_ECN; | |
1770 | } | |
1771 | if (arg & TUN_F_TSO4) | |
1772 | features |= NETIF_F_TSO; | |
1773 | if (arg & TUN_F_TSO6) | |
1774 | features |= NETIF_F_TSO6; | |
1775 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1776 | } | |
e36aa25a SS |
1777 | |
1778 | if (arg & TUN_F_UFO) { | |
1779 | features |= NETIF_F_UFO; | |
1780 | arg &= ~TUN_F_UFO; | |
1781 | } | |
5228ddc9 RR |
1782 | } |
1783 | ||
1784 | /* This gives the user a way to test for new features in future by | |
1785 | * trying to set them. */ | |
1786 | if (arg) | |
1787 | return -EINVAL; | |
1788 | ||
88255375 MM |
1789 | tun->set_features = features; |
1790 | netdev_update_features(tun->dev); | |
5228ddc9 RR |
1791 | |
1792 | return 0; | |
1793 | } | |
1794 | ||
c8d68e6b JW |
1795 | static void tun_detach_filter(struct tun_struct *tun, int n) |
1796 | { | |
1797 | int i; | |
1798 | struct tun_file *tfile; | |
1799 | ||
1800 | for (i = 0; i < n; i++) { | |
b8deabd3 | 1801 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1802 | sk_detach_filter(tfile->socket.sk); |
1803 | } | |
1804 | ||
1805 | tun->filter_attached = false; | |
1806 | } | |
1807 | ||
1808 | static int tun_attach_filter(struct tun_struct *tun) | |
1809 | { | |
1810 | int i, ret = 0; | |
1811 | struct tun_file *tfile; | |
1812 | ||
1813 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1814 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1815 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
1816 | if (ret) { | |
1817 | tun_detach_filter(tun, i); | |
1818 | return ret; | |
1819 | } | |
1820 | } | |
1821 | ||
1822 | tun->filter_attached = true; | |
1823 | return ret; | |
1824 | } | |
1825 | ||
1826 | static void tun_set_sndbuf(struct tun_struct *tun) | |
1827 | { | |
1828 | struct tun_file *tfile; | |
1829 | int i; | |
1830 | ||
1831 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1832 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1833 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
1834 | } | |
1835 | } | |
1836 | ||
cde8b15f JW |
1837 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
1838 | { | |
1839 | struct tun_file *tfile = file->private_data; | |
1840 | struct tun_struct *tun; | |
cde8b15f JW |
1841 | int ret = 0; |
1842 | ||
1843 | rtnl_lock(); | |
1844 | ||
1845 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 1846 | tun = tfile->detached; |
5dbbaf2d | 1847 | if (!tun) { |
cde8b15f | 1848 | ret = -EINVAL; |
5dbbaf2d PM |
1849 | goto unlock; |
1850 | } | |
1851 | ret = security_tun_dev_attach_queue(tun->security); | |
1852 | if (ret < 0) | |
1853 | goto unlock; | |
1854 | ret = tun_attach(tun, file); | |
4008e97f | 1855 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 1856 | tun = rtnl_dereference(tfile->tun); |
9e85722d | 1857 | if (!tun || !(tun->flags & TUN_TAP_MQ) || tfile->detached) |
4008e97f JW |
1858 | ret = -EINVAL; |
1859 | else | |
1860 | __tun_detach(tfile, false); | |
1861 | } else | |
cde8b15f JW |
1862 | ret = -EINVAL; |
1863 | ||
5dbbaf2d | 1864 | unlock: |
cde8b15f JW |
1865 | rtnl_unlock(); |
1866 | return ret; | |
1867 | } | |
1868 | ||
50857e2a AB |
1869 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1870 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1871 | { |
36b50bab | 1872 | struct tun_file *tfile = file->private_data; |
631ab46b | 1873 | struct tun_struct *tun; |
1da177e4 LT |
1874 | void __user* argp = (void __user*)arg; |
1875 | struct ifreq ifr; | |
0625c883 EB |
1876 | kuid_t owner; |
1877 | kgid_t group; | |
33dccbb0 | 1878 | int sndbuf; |
d9d52b51 | 1879 | int vnet_hdr_sz; |
f271b2cc | 1880 | int ret; |
1da177e4 | 1881 | |
cde8b15f | 1882 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) { |
50857e2a | 1883 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 1884 | return -EFAULT; |
8bbb1813 | 1885 | } else { |
a117dacd | 1886 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 1887 | } |
631ab46b EB |
1888 | if (cmd == TUNGETFEATURES) { |
1889 | /* Currently this just means: "what IFF flags are valid?". | |
1890 | * This is needed because we never checked for invalid flags on | |
1891 | * TUNSETIFF. */ | |
1892 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
cde8b15f | 1893 | IFF_VNET_HDR | IFF_MULTI_QUEUE, |
631ab46b | 1894 | (unsigned int __user*)argp); |
cde8b15f JW |
1895 | } else if (cmd == TUNSETQUEUE) |
1896 | return tun_set_queue(file, &ifr); | |
631ab46b | 1897 | |
c8d68e6b | 1898 | ret = 0; |
876bfd4d HX |
1899 | rtnl_lock(); |
1900 | ||
36b50bab | 1901 | tun = __tun_get(tfile); |
1da177e4 | 1902 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1903 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1904 | ||
876bfd4d | 1905 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1906 | |
876bfd4d HX |
1907 | if (ret) |
1908 | goto unlock; | |
1da177e4 | 1909 | |
50857e2a | 1910 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1911 | ret = -EFAULT; |
1912 | goto unlock; | |
1da177e4 LT |
1913 | } |
1914 | ||
876bfd4d | 1915 | ret = -EBADFD; |
1da177e4 | 1916 | if (!tun) |
876bfd4d | 1917 | goto unlock; |
1da177e4 | 1918 | |
1e588338 | 1919 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 1920 | |
631ab46b | 1921 | ret = 0; |
1da177e4 | 1922 | switch (cmd) { |
e3b99556 | 1923 | case TUNGETIFF: |
9ce99cf6 | 1924 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1925 | |
50857e2a | 1926 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1927 | ret = -EFAULT; |
e3b99556 MM |
1928 | break; |
1929 | ||
1da177e4 LT |
1930 | case TUNSETNOCSUM: |
1931 | /* Disable/Enable checksum */ | |
1da177e4 | 1932 | |
88255375 MM |
1933 | /* [unimplemented] */ |
1934 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 1935 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
1936 | break; |
1937 | ||
1938 | case TUNSETPERSIST: | |
54f968d6 JW |
1939 | /* Disable/Enable persist mode. Keep an extra reference to the |
1940 | * module to prevent the module being unprobed. | |
1941 | */ | |
dd38bd85 | 1942 | if (arg && !(tun->flags & TUN_PERSIST)) { |
1da177e4 | 1943 | tun->flags |= TUN_PERSIST; |
54f968d6 | 1944 | __module_get(THIS_MODULE); |
dd38bd85 JW |
1945 | } |
1946 | if (!arg && (tun->flags & TUN_PERSIST)) { | |
1da177e4 | 1947 | tun->flags &= ~TUN_PERSIST; |
54f968d6 JW |
1948 | module_put(THIS_MODULE); |
1949 | } | |
1da177e4 | 1950 | |
6b8a66ee JP |
1951 | tun_debug(KERN_INFO, tun, "persist %s\n", |
1952 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
1953 | break; |
1954 | ||
1955 | case TUNSETOWNER: | |
1956 | /* Set owner of the device */ | |
0625c883 EB |
1957 | owner = make_kuid(current_user_ns(), arg); |
1958 | if (!uid_valid(owner)) { | |
1959 | ret = -EINVAL; | |
1960 | break; | |
1961 | } | |
1962 | tun->owner = owner; | |
1e588338 | 1963 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 1964 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
1965 | break; |
1966 | ||
8c644623 GG |
1967 | case TUNSETGROUP: |
1968 | /* Set group of the device */ | |
0625c883 EB |
1969 | group = make_kgid(current_user_ns(), arg); |
1970 | if (!gid_valid(group)) { | |
1971 | ret = -EINVAL; | |
1972 | break; | |
1973 | } | |
1974 | tun->group = group; | |
1e588338 | 1975 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 1976 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
1977 | break; |
1978 | ||
ff4cc3ac MK |
1979 | case TUNSETLINK: |
1980 | /* Only allow setting the type when the interface is down */ | |
1981 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
1982 | tun_debug(KERN_INFO, tun, |
1983 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 1984 | ret = -EBUSY; |
ff4cc3ac MK |
1985 | } else { |
1986 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
1987 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
1988 | tun->dev->type); | |
48abfe05 | 1989 | ret = 0; |
ff4cc3ac | 1990 | } |
631ab46b | 1991 | break; |
ff4cc3ac | 1992 | |
1da177e4 LT |
1993 | #ifdef TUN_DEBUG |
1994 | case TUNSETDEBUG: | |
1995 | tun->debug = arg; | |
1996 | break; | |
1997 | #endif | |
5228ddc9 | 1998 | case TUNSETOFFLOAD: |
88255375 | 1999 | ret = set_offload(tun, arg); |
631ab46b | 2000 | break; |
5228ddc9 | 2001 | |
f271b2cc MK |
2002 | case TUNSETTXFILTER: |
2003 | /* Can be set only for TAPs */ | |
631ab46b | 2004 | ret = -EINVAL; |
f271b2cc | 2005 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 2006 | break; |
c0e5a8c2 | 2007 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 2008 | break; |
1da177e4 LT |
2009 | |
2010 | case SIOCGIFHWADDR: | |
b595076a | 2011 | /* Get hw address */ |
f271b2cc MK |
2012 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
2013 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 2014 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
2015 | ret = -EFAULT; |
2016 | break; | |
1da177e4 LT |
2017 | |
2018 | case SIOCSIFHWADDR: | |
f271b2cc | 2019 | /* Set hw address */ |
6b8a66ee JP |
2020 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
2021 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 2022 | |
40102371 | 2023 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 2024 | break; |
33dccbb0 HX |
2025 | |
2026 | case TUNGETSNDBUF: | |
54f968d6 | 2027 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
2028 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
2029 | ret = -EFAULT; | |
2030 | break; | |
2031 | ||
2032 | case TUNSETSNDBUF: | |
2033 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
2034 | ret = -EFAULT; | |
2035 | break; | |
2036 | } | |
2037 | ||
c8d68e6b JW |
2038 | tun->sndbuf = sndbuf; |
2039 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
2040 | break; |
2041 | ||
d9d52b51 MT |
2042 | case TUNGETVNETHDRSZ: |
2043 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
2044 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
2045 | ret = -EFAULT; | |
2046 | break; | |
2047 | ||
2048 | case TUNSETVNETHDRSZ: | |
2049 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
2050 | ret = -EFAULT; | |
2051 | break; | |
2052 | } | |
2053 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
2054 | ret = -EINVAL; | |
2055 | break; | |
2056 | } | |
2057 | ||
2058 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
2059 | break; | |
2060 | ||
99405162 MT |
2061 | case TUNATTACHFILTER: |
2062 | /* Can be set only for TAPs */ | |
2063 | ret = -EINVAL; | |
2064 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2065 | break; | |
2066 | ret = -EFAULT; | |
54f968d6 | 2067 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
2068 | break; |
2069 | ||
c8d68e6b | 2070 | ret = tun_attach_filter(tun); |
99405162 MT |
2071 | break; |
2072 | ||
2073 | case TUNDETACHFILTER: | |
2074 | /* Can be set only for TAPs */ | |
2075 | ret = -EINVAL; | |
2076 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2077 | break; | |
c8d68e6b JW |
2078 | ret = 0; |
2079 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
2080 | break; |
2081 | ||
1da177e4 | 2082 | default: |
631ab46b EB |
2083 | ret = -EINVAL; |
2084 | break; | |
ee289b64 | 2085 | } |
1da177e4 | 2086 | |
876bfd4d HX |
2087 | unlock: |
2088 | rtnl_unlock(); | |
2089 | if (tun) | |
2090 | tun_put(tun); | |
631ab46b | 2091 | return ret; |
1da177e4 LT |
2092 | } |
2093 | ||
50857e2a AB |
2094 | static long tun_chr_ioctl(struct file *file, |
2095 | unsigned int cmd, unsigned long arg) | |
2096 | { | |
2097 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
2098 | } | |
2099 | ||
2100 | #ifdef CONFIG_COMPAT | |
2101 | static long tun_chr_compat_ioctl(struct file *file, | |
2102 | unsigned int cmd, unsigned long arg) | |
2103 | { | |
2104 | switch (cmd) { | |
2105 | case TUNSETIFF: | |
2106 | case TUNGETIFF: | |
2107 | case TUNSETTXFILTER: | |
2108 | case TUNGETSNDBUF: | |
2109 | case TUNSETSNDBUF: | |
2110 | case SIOCGIFHWADDR: | |
2111 | case SIOCSIFHWADDR: | |
2112 | arg = (unsigned long)compat_ptr(arg); | |
2113 | break; | |
2114 | default: | |
2115 | arg = (compat_ulong_t)arg; | |
2116 | break; | |
2117 | } | |
2118 | ||
2119 | /* | |
2120 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
2121 | * the end of that structure. All fields that are used in this | |
2122 | * driver are compatible though, we don't need to convert the | |
2123 | * contents. | |
2124 | */ | |
2125 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
2126 | } | |
2127 | #endif /* CONFIG_COMPAT */ | |
2128 | ||
1da177e4 LT |
2129 | static int tun_chr_fasync(int fd, struct file *file, int on) |
2130 | { | |
54f968d6 | 2131 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2132 | int ret; |
2133 | ||
54f968d6 | 2134 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 2135 | goto out; |
6aa20a22 | 2136 | |
1da177e4 | 2137 | if (on) { |
609d7fa9 | 2138 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 2139 | if (ret) |
9d319522 | 2140 | goto out; |
54f968d6 | 2141 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 2142 | } else |
54f968d6 | 2143 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
2144 | ret = 0; |
2145 | out: | |
9d319522 | 2146 | return ret; |
1da177e4 LT |
2147 | } |
2148 | ||
2149 | static int tun_chr_open(struct inode *inode, struct file * file) | |
2150 | { | |
631ab46b | 2151 | struct tun_file *tfile; |
deed49fb | 2152 | |
6b8a66ee | 2153 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 2154 | |
54f968d6 JW |
2155 | tfile = (struct tun_file *)sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL, |
2156 | &tun_proto); | |
631ab46b EB |
2157 | if (!tfile) |
2158 | return -ENOMEM; | |
6e914fc7 | 2159 | rcu_assign_pointer(tfile->tun, NULL); |
36b50bab | 2160 | tfile->net = get_net(current->nsproxy->net_ns); |
54f968d6 JW |
2161 | tfile->flags = 0; |
2162 | ||
2163 | rcu_assign_pointer(tfile->socket.wq, &tfile->wq); | |
2164 | init_waitqueue_head(&tfile->wq.wait); | |
2165 | ||
2166 | tfile->socket.file = file; | |
2167 | tfile->socket.ops = &tun_socket_ops; | |
2168 | ||
2169 | sock_init_data(&tfile->socket, &tfile->sk); | |
2170 | sk_change_net(&tfile->sk, tfile->net); | |
2171 | ||
2172 | tfile->sk.sk_write_space = tun_sock_write_space; | |
2173 | tfile->sk.sk_sndbuf = INT_MAX; | |
2174 | ||
631ab46b | 2175 | file->private_data = tfile; |
54f968d6 | 2176 | set_bit(SOCK_EXTERNALLY_ALLOCATED, &tfile->socket.flags); |
4008e97f | 2177 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 2178 | |
19a6afb2 JW |
2179 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
2180 | ||
1da177e4 LT |
2181 | return 0; |
2182 | } | |
2183 | ||
2184 | static int tun_chr_close(struct inode *inode, struct file *file) | |
2185 | { | |
631ab46b | 2186 | struct tun_file *tfile = file->private_data; |
54f968d6 | 2187 | struct net *net = tfile->net; |
1da177e4 | 2188 | |
c8d68e6b | 2189 | tun_detach(tfile, true); |
54f968d6 | 2190 | put_net(net); |
1da177e4 LT |
2191 | |
2192 | return 0; | |
2193 | } | |
2194 | ||
d54b1fdb | 2195 | static const struct file_operations tun_fops = { |
6aa20a22 | 2196 | .owner = THIS_MODULE, |
1da177e4 | 2197 | .llseek = no_llseek, |
ee0b3e67 BP |
2198 | .read = do_sync_read, |
2199 | .aio_read = tun_chr_aio_read, | |
2200 | .write = do_sync_write, | |
2201 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 2202 | .poll = tun_chr_poll, |
50857e2a AB |
2203 | .unlocked_ioctl = tun_chr_ioctl, |
2204 | #ifdef CONFIG_COMPAT | |
2205 | .compat_ioctl = tun_chr_compat_ioctl, | |
2206 | #endif | |
1da177e4 LT |
2207 | .open = tun_chr_open, |
2208 | .release = tun_chr_close, | |
6aa20a22 | 2209 | .fasync = tun_chr_fasync |
1da177e4 LT |
2210 | }; |
2211 | ||
2212 | static struct miscdevice tun_miscdev = { | |
2213 | .minor = TUN_MINOR, | |
2214 | .name = "tun", | |
e454cea2 | 2215 | .nodename = "net/tun", |
1da177e4 | 2216 | .fops = &tun_fops, |
1da177e4 LT |
2217 | }; |
2218 | ||
2219 | /* ethtool interface */ | |
2220 | ||
2221 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
2222 | { | |
2223 | cmd->supported = 0; | |
2224 | cmd->advertising = 0; | |
70739497 | 2225 | ethtool_cmd_speed_set(cmd, SPEED_10); |
1da177e4 LT |
2226 | cmd->duplex = DUPLEX_FULL; |
2227 | cmd->port = PORT_TP; | |
2228 | cmd->phy_address = 0; | |
2229 | cmd->transceiver = XCVR_INTERNAL; | |
2230 | cmd->autoneg = AUTONEG_DISABLE; | |
2231 | cmd->maxtxpkt = 0; | |
2232 | cmd->maxrxpkt = 0; | |
2233 | return 0; | |
2234 | } | |
2235 | ||
2236 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
2237 | { | |
2238 | struct tun_struct *tun = netdev_priv(dev); | |
2239 | ||
33a5ba14 RJ |
2240 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
2241 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
2242 | |
2243 | switch (tun->flags & TUN_TYPE_MASK) { | |
2244 | case TUN_TUN_DEV: | |
33a5ba14 | 2245 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 LT |
2246 | break; |
2247 | case TUN_TAP_DEV: | |
33a5ba14 | 2248 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
2249 | break; |
2250 | } | |
2251 | } | |
2252 | ||
2253 | static u32 tun_get_msglevel(struct net_device *dev) | |
2254 | { | |
2255 | #ifdef TUN_DEBUG | |
2256 | struct tun_struct *tun = netdev_priv(dev); | |
2257 | return tun->debug; | |
2258 | #else | |
2259 | return -EOPNOTSUPP; | |
2260 | #endif | |
2261 | } | |
2262 | ||
2263 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
2264 | { | |
2265 | #ifdef TUN_DEBUG | |
2266 | struct tun_struct *tun = netdev_priv(dev); | |
2267 | tun->debug = value; | |
2268 | #endif | |
2269 | } | |
2270 | ||
7282d491 | 2271 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
2272 | .get_settings = tun_get_settings, |
2273 | .get_drvinfo = tun_get_drvinfo, | |
2274 | .get_msglevel = tun_get_msglevel, | |
2275 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 2276 | .get_link = ethtool_op_get_link, |
1da177e4 LT |
2277 | }; |
2278 | ||
79d17604 | 2279 | |
1da177e4 LT |
2280 | static int __init tun_init(void) |
2281 | { | |
2282 | int ret = 0; | |
2283 | ||
6b8a66ee JP |
2284 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
2285 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 2286 | |
f019a7a5 | 2287 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 2288 | if (ret) { |
6b8a66ee | 2289 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 2290 | goto err_linkops; |
79d17604 PE |
2291 | } |
2292 | ||
1da177e4 | 2293 | ret = misc_register(&tun_miscdev); |
79d17604 | 2294 | if (ret) { |
6b8a66ee | 2295 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
2296 | goto err_misc; |
2297 | } | |
f019a7a5 | 2298 | return 0; |
79d17604 | 2299 | err_misc: |
f019a7a5 EB |
2300 | rtnl_link_unregister(&tun_link_ops); |
2301 | err_linkops: | |
1da177e4 LT |
2302 | return ret; |
2303 | } | |
2304 | ||
2305 | static void tun_cleanup(void) | |
2306 | { | |
6aa20a22 | 2307 | misc_deregister(&tun_miscdev); |
f019a7a5 | 2308 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
2309 | } |
2310 | ||
05c2828c MT |
2311 | /* Get an underlying socket object from tun file. Returns error unless file is |
2312 | * attached to a device. The returned object works like a packet socket, it | |
2313 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
2314 | * holding a reference to the file for as long as the socket is in use. */ | |
2315 | struct socket *tun_get_socket(struct file *file) | |
2316 | { | |
6e914fc7 | 2317 | struct tun_file *tfile; |
05c2828c MT |
2318 | if (file->f_op != &tun_fops) |
2319 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
2320 | tfile = file->private_data; |
2321 | if (!tfile) | |
05c2828c | 2322 | return ERR_PTR(-EBADFD); |
54f968d6 | 2323 | return &tfile->socket; |
05c2828c MT |
2324 | } |
2325 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
2326 | ||
1da177e4 LT |
2327 | module_init(tun_init); |
2328 | module_exit(tun_cleanup); | |
2329 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
2330 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
2331 | MODULE_LICENSE("GPL"); | |
2332 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 2333 | MODULE_ALIAS("devname:net/tun"); |