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> | |
6680ec68 | 63 | #include <linux/if_vlan.h> |
1da177e4 | 64 | #include <linux/crc32.h> |
d647a591 | 65 | #include <linux/nsproxy.h> |
f43798c2 | 66 | #include <linux/virtio_net.h> |
99405162 | 67 | #include <linux/rcupdate.h> |
881d966b | 68 | #include <net/net_namespace.h> |
79d17604 | 69 | #include <net/netns/generic.h> |
f019a7a5 | 70 | #include <net/rtnetlink.h> |
33dccbb0 | 71 | #include <net/sock.h> |
1da177e4 | 72 | |
1da177e4 LT |
73 | #include <asm/uaccess.h> |
74 | ||
14daa021 RR |
75 | /* Uncomment to enable debugging */ |
76 | /* #define TUN_DEBUG 1 */ | |
77 | ||
1da177e4 LT |
78 | #ifdef TUN_DEBUG |
79 | static int debug; | |
14daa021 | 80 | |
6b8a66ee JP |
81 | #define tun_debug(level, tun, fmt, args...) \ |
82 | do { \ | |
83 | if (tun->debug) \ | |
84 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
85 | } while (0) | |
86 | #define DBG1(level, fmt, args...) \ | |
87 | do { \ | |
88 | if (debug == 2) \ | |
89 | printk(level fmt, ##args); \ | |
90 | } while (0) | |
14daa021 | 91 | #else |
6b8a66ee JP |
92 | #define tun_debug(level, tun, fmt, args...) \ |
93 | do { \ | |
94 | if (0) \ | |
95 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
96 | } while (0) | |
97 | #define DBG1(level, fmt, args...) \ | |
98 | do { \ | |
99 | if (0) \ | |
100 | printk(level fmt, ##args); \ | |
101 | } while (0) | |
14daa021 RR |
102 | #endif |
103 | ||
0690899b MT |
104 | #define GOODCOPY_LEN 128 |
105 | ||
f271b2cc MK |
106 | #define FLT_EXACT_COUNT 8 |
107 | struct tap_filter { | |
108 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
109 | u32 mask[2]; /* Mask of the hashed addrs */ | |
110 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
111 | }; | |
112 | ||
92d4ea6e | 113 | /* DEFAULT_MAX_NUM_RSS_QUEUES were chosen to let the rx/tx queues allocated for |
edfb6a14 JW |
114 | * the netdevice to be fit in one page. So we can make sure the success of |
115 | * memory allocation. TODO: increase the limit. */ | |
116 | #define MAX_TAP_QUEUES DEFAULT_MAX_NUM_RSS_QUEUES | |
b8732fb7 | 117 | #define MAX_TAP_FLOWS 4096 |
c8d68e6b | 118 | |
96442e42 JW |
119 | #define TUN_FLOW_EXPIRE (3 * HZ) |
120 | ||
54f968d6 | 121 | /* A tun_file connects an open character device to a tuntap netdevice. It |
92d4ea6e | 122 | * also contains all socket related structures (except sock_fprog and tap_filter) |
54f968d6 JW |
123 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
124 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 125 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 126 | * this). |
6e914fc7 JW |
127 | * |
128 | * RCU usage: | |
36fe8c09 | 129 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 130 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 131 | */ |
631ab46b | 132 | struct tun_file { |
54f968d6 JW |
133 | struct sock sk; |
134 | struct socket socket; | |
135 | struct socket_wq wq; | |
6e914fc7 | 136 | struct tun_struct __rcu *tun; |
36b50bab | 137 | struct net *net; |
54f968d6 JW |
138 | struct fasync_struct *fasync; |
139 | /* only used for fasnyc */ | |
140 | unsigned int flags; | |
fb7589a1 PE |
141 | union { |
142 | u16 queue_index; | |
143 | unsigned int ifindex; | |
144 | }; | |
4008e97f JW |
145 | struct list_head next; |
146 | struct tun_struct *detached; | |
631ab46b EB |
147 | }; |
148 | ||
96442e42 JW |
149 | struct tun_flow_entry { |
150 | struct hlist_node hash_link; | |
151 | struct rcu_head rcu; | |
152 | struct tun_struct *tun; | |
153 | ||
154 | u32 rxhash; | |
9bc88939 | 155 | u32 rps_rxhash; |
96442e42 JW |
156 | int queue_index; |
157 | unsigned long updated; | |
158 | }; | |
159 | ||
160 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
161 | ||
54f968d6 | 162 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 163 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
164 | * file were attached to a persist device. |
165 | */ | |
14daa021 | 166 | struct tun_struct { |
c8d68e6b JW |
167 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
168 | unsigned int numqueues; | |
f271b2cc | 169 | unsigned int flags; |
0625c883 EB |
170 | kuid_t owner; |
171 | kgid_t group; | |
14daa021 | 172 | |
14daa021 | 173 | struct net_device *dev; |
c8f44aff | 174 | netdev_features_t set_features; |
88255375 MM |
175 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
176 | NETIF_F_TSO6|NETIF_F_UFO) | |
d9d52b51 MT |
177 | |
178 | int vnet_hdr_sz; | |
54f968d6 JW |
179 | int sndbuf; |
180 | struct tap_filter txflt; | |
181 | struct sock_fprog fprog; | |
182 | /* protected by rtnl lock */ | |
183 | bool filter_attached; | |
14daa021 RR |
184 | #ifdef TUN_DEBUG |
185 | int debug; | |
1da177e4 | 186 | #endif |
96442e42 | 187 | spinlock_t lock; |
96442e42 JW |
188 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
189 | struct timer_list flow_gc_timer; | |
190 | unsigned long ageing_time; | |
4008e97f JW |
191 | unsigned int numdisabled; |
192 | struct list_head disabled; | |
5dbbaf2d | 193 | void *security; |
b8732fb7 | 194 | u32 flow_count; |
14daa021 | 195 | }; |
1da177e4 | 196 | |
96442e42 JW |
197 | static inline u32 tun_hashfn(u32 rxhash) |
198 | { | |
199 | return rxhash & 0x3ff; | |
200 | } | |
201 | ||
202 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
203 | { | |
204 | struct tun_flow_entry *e; | |
96442e42 | 205 | |
b67bfe0d | 206 | hlist_for_each_entry_rcu(e, head, hash_link) { |
96442e42 JW |
207 | if (e->rxhash == rxhash) |
208 | return e; | |
209 | } | |
210 | return NULL; | |
211 | } | |
212 | ||
213 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
214 | struct hlist_head *head, | |
215 | u32 rxhash, u16 queue_index) | |
216 | { | |
9fdc6bef ED |
217 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
218 | ||
96442e42 JW |
219 | if (e) { |
220 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
221 | rxhash, queue_index); | |
222 | e->updated = jiffies; | |
223 | e->rxhash = rxhash; | |
9bc88939 | 224 | e->rps_rxhash = 0; |
96442e42 JW |
225 | e->queue_index = queue_index; |
226 | e->tun = tun; | |
227 | hlist_add_head_rcu(&e->hash_link, head); | |
b8732fb7 | 228 | ++tun->flow_count; |
96442e42 JW |
229 | } |
230 | return e; | |
231 | } | |
232 | ||
96442e42 JW |
233 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
234 | { | |
235 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
236 | e->rxhash, e->queue_index); | |
9bc88939 | 237 | sock_rps_reset_flow_hash(e->rps_rxhash); |
96442e42 | 238 | hlist_del_rcu(&e->hash_link); |
9fdc6bef | 239 | kfree_rcu(e, rcu); |
b8732fb7 | 240 | --tun->flow_count; |
96442e42 JW |
241 | } |
242 | ||
243 | static void tun_flow_flush(struct tun_struct *tun) | |
244 | { | |
245 | int i; | |
246 | ||
247 | spin_lock_bh(&tun->lock); | |
248 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
249 | struct tun_flow_entry *e; | |
b67bfe0d | 250 | struct hlist_node *n; |
96442e42 | 251 | |
b67bfe0d | 252 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
96442e42 JW |
253 | tun_flow_delete(tun, e); |
254 | } | |
255 | spin_unlock_bh(&tun->lock); | |
256 | } | |
257 | ||
258 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
259 | { | |
260 | int i; | |
261 | ||
262 | spin_lock_bh(&tun->lock); | |
263 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
264 | struct tun_flow_entry *e; | |
b67bfe0d | 265 | struct hlist_node *n; |
96442e42 | 266 | |
b67bfe0d | 267 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
268 | if (e->queue_index == queue_index) |
269 | tun_flow_delete(tun, e); | |
270 | } | |
271 | } | |
272 | spin_unlock_bh(&tun->lock); | |
273 | } | |
274 | ||
275 | static void tun_flow_cleanup(unsigned long data) | |
276 | { | |
277 | struct tun_struct *tun = (struct tun_struct *)data; | |
278 | unsigned long delay = tun->ageing_time; | |
279 | unsigned long next_timer = jiffies + delay; | |
280 | unsigned long count = 0; | |
281 | int i; | |
282 | ||
283 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
284 | ||
285 | spin_lock_bh(&tun->lock); | |
286 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
287 | struct tun_flow_entry *e; | |
b67bfe0d | 288 | struct hlist_node *n; |
96442e42 | 289 | |
b67bfe0d | 290 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
291 | unsigned long this_timer; |
292 | count++; | |
293 | this_timer = e->updated + delay; | |
294 | if (time_before_eq(this_timer, jiffies)) | |
295 | tun_flow_delete(tun, e); | |
296 | else if (time_before(this_timer, next_timer)) | |
297 | next_timer = this_timer; | |
298 | } | |
299 | } | |
300 | ||
301 | if (count) | |
302 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
303 | spin_unlock_bh(&tun->lock); | |
304 | } | |
305 | ||
49974420 | 306 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
9e85722d | 307 | struct tun_file *tfile) |
96442e42 JW |
308 | { |
309 | struct hlist_head *head; | |
310 | struct tun_flow_entry *e; | |
311 | unsigned long delay = tun->ageing_time; | |
9e85722d | 312 | u16 queue_index = tfile->queue_index; |
96442e42 JW |
313 | |
314 | if (!rxhash) | |
315 | return; | |
316 | else | |
317 | head = &tun->flows[tun_hashfn(rxhash)]; | |
318 | ||
319 | rcu_read_lock(); | |
320 | ||
9e85722d JW |
321 | /* We may get a very small possibility of OOO during switching, not |
322 | * worth to optimize.*/ | |
323 | if (tun->numqueues == 1 || tfile->detached) | |
96442e42 JW |
324 | goto unlock; |
325 | ||
326 | e = tun_flow_find(head, rxhash); | |
327 | if (likely(e)) { | |
328 | /* TODO: keep queueing to old queue until it's empty? */ | |
329 | e->queue_index = queue_index; | |
330 | e->updated = jiffies; | |
9bc88939 | 331 | sock_rps_record_flow_hash(e->rps_rxhash); |
96442e42 JW |
332 | } else { |
333 | spin_lock_bh(&tun->lock); | |
b8732fb7 JW |
334 | if (!tun_flow_find(head, rxhash) && |
335 | tun->flow_count < MAX_TAP_FLOWS) | |
96442e42 JW |
336 | tun_flow_create(tun, head, rxhash, queue_index); |
337 | ||
338 | if (!timer_pending(&tun->flow_gc_timer)) | |
339 | mod_timer(&tun->flow_gc_timer, | |
340 | round_jiffies_up(jiffies + delay)); | |
341 | spin_unlock_bh(&tun->lock); | |
342 | } | |
343 | ||
344 | unlock: | |
345 | rcu_read_unlock(); | |
346 | } | |
347 | ||
9bc88939 TH |
348 | /** |
349 | * Save the hash received in the stack receive path and update the | |
350 | * flow_hash table accordingly. | |
351 | */ | |
352 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) | |
353 | { | |
354 | if (unlikely(e->rps_rxhash != hash)) { | |
355 | sock_rps_reset_flow_hash(e->rps_rxhash); | |
356 | e->rps_rxhash = hash; | |
357 | } | |
358 | } | |
359 | ||
c8d68e6b | 360 | /* We try to identify a flow through its rxhash first. The reason that |
92d4ea6e | 361 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
c8d68e6b JW |
362 | * the rxq based on the txq where the last packet of the flow comes. As |
363 | * the userspace application move between processors, we may get a | |
364 | * different rxq no. here. If we could not get rxhash, then we would | |
365 | * hope the rxq no. may help here. | |
366 | */ | |
367 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb) | |
368 | { | |
369 | struct tun_struct *tun = netdev_priv(dev); | |
96442e42 | 370 | struct tun_flow_entry *e; |
c8d68e6b JW |
371 | u32 txq = 0; |
372 | u32 numqueues = 0; | |
373 | ||
374 | rcu_read_lock(); | |
92bb73ea | 375 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 376 | |
3958afa1 | 377 | txq = skb_get_hash(skb); |
c8d68e6b | 378 | if (txq) { |
96442e42 | 379 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
9bc88939 | 380 | if (e) { |
9bc88939 | 381 | tun_flow_save_rps_rxhash(e, txq); |
fbe4d456 | 382 | txq = e->queue_index; |
9bc88939 | 383 | } else |
96442e42 JW |
384 | /* use multiply and shift instead of expensive divide */ |
385 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
386 | } else if (likely(skb_rx_queue_recorded(skb))) { |
387 | txq = skb_get_rx_queue(skb); | |
388 | while (unlikely(txq >= numqueues)) | |
389 | txq -= numqueues; | |
390 | } | |
391 | ||
392 | rcu_read_unlock(); | |
393 | return txq; | |
394 | } | |
395 | ||
cde8b15f JW |
396 | static inline bool tun_not_capable(struct tun_struct *tun) |
397 | { | |
398 | const struct cred *cred = current_cred(); | |
c260b772 | 399 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
400 | |
401 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
402 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 403 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
404 | } |
405 | ||
c8d68e6b JW |
406 | static void tun_set_real_num_queues(struct tun_struct *tun) |
407 | { | |
408 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
409 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
410 | } | |
411 | ||
4008e97f JW |
412 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
413 | { | |
414 | tfile->detached = tun; | |
415 | list_add_tail(&tfile->next, &tun->disabled); | |
416 | ++tun->numdisabled; | |
417 | } | |
418 | ||
d32649d1 | 419 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
420 | { |
421 | struct tun_struct *tun = tfile->detached; | |
422 | ||
423 | tfile->detached = NULL; | |
424 | list_del_init(&tfile->next); | |
425 | --tun->numdisabled; | |
426 | return tun; | |
427 | } | |
428 | ||
4bfb0513 JW |
429 | static void tun_queue_purge(struct tun_file *tfile) |
430 | { | |
431 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
432 | skb_queue_purge(&tfile->sk.sk_error_queue); | |
433 | } | |
434 | ||
c8d68e6b JW |
435 | static void __tun_detach(struct tun_file *tfile, bool clean) |
436 | { | |
437 | struct tun_file *ntfile; | |
438 | struct tun_struct *tun; | |
c8d68e6b | 439 | |
b8deabd3 JW |
440 | tun = rtnl_dereference(tfile->tun); |
441 | ||
9e85722d | 442 | if (tun && !tfile->detached) { |
c8d68e6b JW |
443 | u16 index = tfile->queue_index; |
444 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
445 | |
446 | rcu_assign_pointer(tun->tfiles[index], | |
447 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 448 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
449 | ntfile->queue_index = index; |
450 | ||
451 | --tun->numqueues; | |
9e85722d JW |
452 | if (clean) { |
453 | rcu_assign_pointer(tfile->tun, NULL); | |
4008e97f | 454 | sock_put(&tfile->sk); |
9e85722d | 455 | } else |
4008e97f | 456 | tun_disable_queue(tun, tfile); |
c8d68e6b JW |
457 | |
458 | synchronize_net(); | |
96442e42 | 459 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b | 460 | /* Drop read queue */ |
4bfb0513 | 461 | tun_queue_purge(tfile); |
c8d68e6b | 462 | tun_set_real_num_queues(tun); |
dd38bd85 | 463 | } else if (tfile->detached && clean) { |
4008e97f | 464 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
465 | sock_put(&tfile->sk); |
466 | } | |
c8d68e6b JW |
467 | |
468 | if (clean) { | |
af668b3c MT |
469 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
470 | netif_carrier_off(tun->dev); | |
471 | ||
472 | if (!(tun->flags & TUN_PERSIST) && | |
473 | tun->dev->reg_state == NETREG_REGISTERED) | |
4008e97f | 474 | unregister_netdevice(tun->dev); |
af668b3c | 475 | } |
4008e97f | 476 | |
c8d68e6b JW |
477 | BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED, |
478 | &tfile->socket.flags)); | |
479 | sk_release_kernel(&tfile->sk); | |
480 | } | |
481 | } | |
482 | ||
483 | static void tun_detach(struct tun_file *tfile, bool clean) | |
484 | { | |
485 | rtnl_lock(); | |
486 | __tun_detach(tfile, clean); | |
487 | rtnl_unlock(); | |
488 | } | |
489 | ||
490 | static void tun_detach_all(struct net_device *dev) | |
491 | { | |
492 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 493 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
494 | int i, n = tun->numqueues; |
495 | ||
496 | for (i = 0; i < n; i++) { | |
b8deabd3 | 497 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
498 | BUG_ON(!tfile); |
499 | wake_up_all(&tfile->wq.wait); | |
500 | rcu_assign_pointer(tfile->tun, NULL); | |
501 | --tun->numqueues; | |
502 | } | |
9e85722d JW |
503 | list_for_each_entry(tfile, &tun->disabled, next) { |
504 | wake_up_all(&tfile->wq.wait); | |
505 | rcu_assign_pointer(tfile->tun, NULL); | |
506 | } | |
c8d68e6b JW |
507 | BUG_ON(tun->numqueues != 0); |
508 | ||
509 | synchronize_net(); | |
510 | for (i = 0; i < n; i++) { | |
b8deabd3 | 511 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 512 | /* Drop read queue */ |
4bfb0513 | 513 | tun_queue_purge(tfile); |
c8d68e6b JW |
514 | sock_put(&tfile->sk); |
515 | } | |
4008e97f JW |
516 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
517 | tun_enable_queue(tfile); | |
4bfb0513 | 518 | tun_queue_purge(tfile); |
4008e97f JW |
519 | sock_put(&tfile->sk); |
520 | } | |
521 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 JW |
522 | |
523 | if (tun->flags & TUN_PERSIST) | |
524 | module_put(THIS_MODULE); | |
c8d68e6b JW |
525 | } |
526 | ||
849c9b6f | 527 | static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filter) |
a7385ba2 | 528 | { |
631ab46b | 529 | struct tun_file *tfile = file->private_data; |
38231b7a | 530 | int err; |
a7385ba2 | 531 | |
5dbbaf2d PM |
532 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
533 | if (err < 0) | |
534 | goto out; | |
535 | ||
38231b7a | 536 | err = -EINVAL; |
9e85722d | 537 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
538 | goto out; |
539 | ||
540 | err = -EBUSY; | |
c8d68e6b JW |
541 | if (!(tun->flags & TUN_TAP_MQ) && tun->numqueues == 1) |
542 | goto out; | |
543 | ||
544 | err = -E2BIG; | |
4008e97f JW |
545 | if (!tfile->detached && |
546 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
547 | goto out; |
548 | ||
549 | err = 0; | |
54f968d6 | 550 | |
92d4ea6e | 551 | /* Re-attach the filter to persist device */ |
849c9b6f | 552 | if (!skip_filter && (tun->filter_attached == true)) { |
54f968d6 JW |
553 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
554 | if (!err) | |
555 | goto out; | |
556 | } | |
c8d68e6b | 557 | tfile->queue_index = tun->numqueues; |
6e914fc7 | 558 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 559 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 560 | tun->numqueues++; |
a7385ba2 | 561 | |
4008e97f JW |
562 | if (tfile->detached) |
563 | tun_enable_queue(tfile); | |
564 | else | |
565 | sock_hold(&tfile->sk); | |
566 | ||
c8d68e6b | 567 | tun_set_real_num_queues(tun); |
a7385ba2 | 568 | |
c8d68e6b JW |
569 | /* device is allowed to go away first, so no need to hold extra |
570 | * refcnt. | |
571 | */ | |
572 | ||
573 | out: | |
574 | return err; | |
631ab46b EB |
575 | } |
576 | ||
577 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
578 | { | |
6e914fc7 | 579 | struct tun_struct *tun; |
c70f1829 | 580 | |
6e914fc7 JW |
581 | rcu_read_lock(); |
582 | tun = rcu_dereference(tfile->tun); | |
583 | if (tun) | |
584 | dev_hold(tun->dev); | |
585 | rcu_read_unlock(); | |
c70f1829 EB |
586 | |
587 | return tun; | |
631ab46b EB |
588 | } |
589 | ||
590 | static struct tun_struct *tun_get(struct file *file) | |
591 | { | |
592 | return __tun_get(file->private_data); | |
593 | } | |
594 | ||
595 | static void tun_put(struct tun_struct *tun) | |
596 | { | |
6e914fc7 | 597 | dev_put(tun->dev); |
631ab46b EB |
598 | } |
599 | ||
6b8a66ee | 600 | /* TAP filtering */ |
f271b2cc MK |
601 | static void addr_hash_set(u32 *mask, const u8 *addr) |
602 | { | |
603 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
604 | mask[n >> 5] |= (1 << (n & 31)); | |
605 | } | |
606 | ||
607 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
608 | { | |
609 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
610 | return mask[n >> 5] & (1 << (n & 31)); | |
611 | } | |
612 | ||
613 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
614 | { | |
615 | struct { u8 u[ETH_ALEN]; } *addr; | |
616 | struct tun_filter uf; | |
617 | int err, alen, n, nexact; | |
618 | ||
619 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
620 | return -EFAULT; | |
621 | ||
622 | if (!uf.count) { | |
623 | /* Disabled */ | |
624 | filter->count = 0; | |
625 | return 0; | |
626 | } | |
627 | ||
628 | alen = ETH_ALEN * uf.count; | |
629 | addr = kmalloc(alen, GFP_KERNEL); | |
630 | if (!addr) | |
631 | return -ENOMEM; | |
632 | ||
633 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
634 | err = -EFAULT; | |
635 | goto done; | |
636 | } | |
637 | ||
638 | /* The filter is updated without holding any locks. Which is | |
639 | * perfectly safe. We disable it first and in the worst | |
640 | * case we'll accept a few undesired packets. */ | |
641 | filter->count = 0; | |
642 | wmb(); | |
643 | ||
644 | /* Use first set of addresses as an exact filter */ | |
645 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
646 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
647 | ||
648 | nexact = n; | |
649 | ||
cfbf84fc AW |
650 | /* Remaining multicast addresses are hashed, |
651 | * unicast will leave the filter disabled. */ | |
f271b2cc | 652 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
653 | for (; n < uf.count; n++) { |
654 | if (!is_multicast_ether_addr(addr[n].u)) { | |
655 | err = 0; /* no filter */ | |
656 | goto done; | |
657 | } | |
f271b2cc | 658 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 659 | } |
f271b2cc MK |
660 | |
661 | /* For ALLMULTI just set the mask to all ones. | |
662 | * This overrides the mask populated above. */ | |
663 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
664 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
665 | ||
666 | /* Now enable the filter */ | |
667 | wmb(); | |
668 | filter->count = nexact; | |
669 | ||
670 | /* Return the number of exact filters */ | |
671 | err = nexact; | |
672 | ||
673 | done: | |
674 | kfree(addr); | |
675 | return err; | |
676 | } | |
677 | ||
678 | /* Returns: 0 - drop, !=0 - accept */ | |
679 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
680 | { | |
681 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
682 | * at this point. */ | |
683 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
684 | int i; | |
685 | ||
686 | /* Exact match */ | |
687 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 688 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
689 | return 1; |
690 | ||
691 | /* Inexact match (multicast only) */ | |
692 | if (is_multicast_ether_addr(eh->h_dest)) | |
693 | return addr_hash_test(filter->mask, eh->h_dest); | |
694 | ||
695 | return 0; | |
696 | } | |
697 | ||
698 | /* | |
699 | * Checks whether the packet is accepted or not. | |
700 | * Returns: 0 - drop, !=0 - accept | |
701 | */ | |
702 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
703 | { | |
704 | if (!filter->count) | |
705 | return 1; | |
706 | ||
707 | return run_filter(filter, skb); | |
708 | } | |
709 | ||
1da177e4 LT |
710 | /* Network device part of the driver */ |
711 | ||
7282d491 | 712 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 713 | |
c70f1829 EB |
714 | /* Net device detach from fd. */ |
715 | static void tun_net_uninit(struct net_device *dev) | |
716 | { | |
c8d68e6b | 717 | tun_detach_all(dev); |
c70f1829 EB |
718 | } |
719 | ||
1da177e4 LT |
720 | /* Net device open. */ |
721 | static int tun_net_open(struct net_device *dev) | |
722 | { | |
c8d68e6b | 723 | netif_tx_start_all_queues(dev); |
1da177e4 LT |
724 | return 0; |
725 | } | |
726 | ||
727 | /* Net device close. */ | |
728 | static int tun_net_close(struct net_device *dev) | |
729 | { | |
c8d68e6b | 730 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
731 | return 0; |
732 | } | |
733 | ||
734 | /* Net device start xmit */ | |
424efe9c | 735 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
736 | { |
737 | struct tun_struct *tun = netdev_priv(dev); | |
c8d68e6b | 738 | int txq = skb->queue_mapping; |
6e914fc7 | 739 | struct tun_file *tfile; |
1da177e4 | 740 | |
6e914fc7 | 741 | rcu_read_lock(); |
c8d68e6b JW |
742 | tfile = rcu_dereference(tun->tfiles[txq]); |
743 | ||
1da177e4 | 744 | /* Drop packet if interface is not attached */ |
c8d68e6b | 745 | if (txq >= tun->numqueues) |
1da177e4 LT |
746 | goto drop; |
747 | ||
9bc88939 TH |
748 | if (tun->numqueues == 1) { |
749 | /* Select queue was not called for the skbuff, so we extract the | |
750 | * RPS hash and save it into the flow_table here. | |
751 | */ | |
752 | __u32 rxhash; | |
753 | ||
754 | rxhash = skb_get_hash(skb); | |
755 | if (rxhash) { | |
756 | struct tun_flow_entry *e; | |
757 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], | |
758 | rxhash); | |
759 | if (e) | |
760 | tun_flow_save_rps_rxhash(e, rxhash); | |
761 | } | |
762 | } | |
763 | ||
6e914fc7 JW |
764 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
765 | ||
c8d68e6b JW |
766 | BUG_ON(!tfile); |
767 | ||
f271b2cc MK |
768 | /* Drop if the filter does not like it. |
769 | * This is a noop if the filter is disabled. | |
770 | * Filter can be enabled only for the TAP devices. */ | |
771 | if (!check_filter(&tun->txflt, skb)) | |
772 | goto drop; | |
773 | ||
54f968d6 JW |
774 | if (tfile->socket.sk->sk_filter && |
775 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
776 | goto drop; |
777 | ||
36fe8c09 | 778 | /* Limit the number of packets queued by dividing txq length with the |
c8d68e6b JW |
779 | * number of queues. |
780 | */ | |
54f968d6 | 781 | if (skb_queue_len(&tfile->socket.sk->sk_receive_queue) |
5d097109 MT |
782 | >= dev->tx_queue_len / tun->numqueues) |
783 | goto drop; | |
1da177e4 | 784 | |
7bf66305 JW |
785 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
786 | goto drop; | |
787 | ||
eda29772 RC |
788 | if (skb->sk) { |
789 | sock_tx_timestamp(skb->sk, &skb_shinfo(skb)->tx_flags); | |
790 | sw_tx_timestamp(skb); | |
791 | } | |
792 | ||
0110d6f2 | 793 | /* Orphan the skb - required as we might hang on to it |
7bf66305 JW |
794 | * for indefinite time. |
795 | */ | |
0110d6f2 MT |
796 | skb_orphan(skb); |
797 | ||
f8af75f3 ED |
798 | nf_reset(skb); |
799 | ||
f271b2cc | 800 | /* Enqueue packet */ |
54f968d6 | 801 | skb_queue_tail(&tfile->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
802 | |
803 | /* Notify and wake up reader process */ | |
54f968d6 JW |
804 | if (tfile->flags & TUN_FASYNC) |
805 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
806 | wake_up_interruptible_poll(&tfile->wq.wait, POLLIN | | |
05c2828c | 807 | POLLRDNORM | POLLRDBAND); |
6e914fc7 JW |
808 | |
809 | rcu_read_unlock(); | |
6ed10654 | 810 | return NETDEV_TX_OK; |
1da177e4 LT |
811 | |
812 | drop: | |
09f75cd7 | 813 | dev->stats.tx_dropped++; |
149d36f7 | 814 | skb_tx_error(skb); |
1da177e4 | 815 | kfree_skb(skb); |
6e914fc7 | 816 | rcu_read_unlock(); |
6ed10654 | 817 | return NETDEV_TX_OK; |
1da177e4 LT |
818 | } |
819 | ||
f271b2cc | 820 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 821 | { |
f271b2cc MK |
822 | /* |
823 | * This callback is supposed to deal with mc filter in | |
824 | * _rx_ path and has nothing to do with the _tx_ path. | |
825 | * In rx path we always accept everything userspace gives us. | |
826 | */ | |
1da177e4 LT |
827 | } |
828 | ||
4885a504 ES |
829 | #define MIN_MTU 68 |
830 | #define MAX_MTU 65535 | |
831 | ||
832 | static int | |
833 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
834 | { | |
835 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
836 | return -EINVAL; | |
837 | dev->mtu = new_mtu; | |
838 | return 0; | |
839 | } | |
840 | ||
c8f44aff MM |
841 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
842 | netdev_features_t features) | |
88255375 MM |
843 | { |
844 | struct tun_struct *tun = netdev_priv(dev); | |
845 | ||
846 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
847 | } | |
bebd097a NH |
848 | #ifdef CONFIG_NET_POLL_CONTROLLER |
849 | static void tun_poll_controller(struct net_device *dev) | |
850 | { | |
851 | /* | |
852 | * Tun only receives frames when: | |
853 | * 1) the char device endpoint gets data from user space | |
854 | * 2) the tun socket gets a sendmsg call from user space | |
92d4ea6e | 855 | * Since both of those are synchronous operations, we are guaranteed |
bebd097a | 856 | * never to have pending data when we poll for it |
92d4ea6e | 857 | * so there is nothing to do here but return. |
bebd097a NH |
858 | * We need this though so netpoll recognizes us as an interface that |
859 | * supports polling, which enables bridge devices in virt setups to | |
860 | * still use netconsole | |
861 | */ | |
862 | return; | |
863 | } | |
864 | #endif | |
758e43b7 | 865 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 866 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
867 | .ndo_open = tun_net_open, |
868 | .ndo_stop = tun_net_close, | |
00829823 | 869 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 870 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 871 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 872 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
873 | #ifdef CONFIG_NET_POLL_CONTROLLER |
874 | .ndo_poll_controller = tun_poll_controller, | |
875 | #endif | |
758e43b7 SH |
876 | }; |
877 | ||
878 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 879 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
880 | .ndo_open = tun_net_open, |
881 | .ndo_stop = tun_net_close, | |
00829823 | 882 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 883 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 884 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 885 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
886 | .ndo_set_mac_address = eth_mac_addr, |
887 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 888 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
889 | #ifdef CONFIG_NET_POLL_CONTROLLER |
890 | .ndo_poll_controller = tun_poll_controller, | |
891 | #endif | |
758e43b7 SH |
892 | }; |
893 | ||
944a1376 | 894 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
895 | { |
896 | int i; | |
897 | ||
96442e42 JW |
898 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
899 | INIT_HLIST_HEAD(&tun->flows[i]); | |
900 | ||
901 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
902 | setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); | |
903 | mod_timer(&tun->flow_gc_timer, | |
904 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
905 | } |
906 | ||
907 | static void tun_flow_uninit(struct tun_struct *tun) | |
908 | { | |
909 | del_timer_sync(&tun->flow_gc_timer); | |
910 | tun_flow_flush(tun); | |
96442e42 JW |
911 | } |
912 | ||
1da177e4 LT |
913 | /* Initialize net device. */ |
914 | static void tun_net_init(struct net_device *dev) | |
915 | { | |
916 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 917 | |
1da177e4 LT |
918 | switch (tun->flags & TUN_TYPE_MASK) { |
919 | case TUN_TUN_DEV: | |
758e43b7 SH |
920 | dev->netdev_ops = &tun_netdev_ops; |
921 | ||
1da177e4 LT |
922 | /* Point-to-Point TUN Device */ |
923 | dev->hard_header_len = 0; | |
924 | dev->addr_len = 0; | |
925 | dev->mtu = 1500; | |
926 | ||
927 | /* Zero header length */ | |
6aa20a22 | 928 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
929 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
930 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
931 | break; | |
932 | ||
933 | case TUN_TAP_DEV: | |
7a0a9608 | 934 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 935 | /* Ethernet TAP Device */ |
1da177e4 | 936 | ether_setup(dev); |
550fd08c | 937 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 938 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 939 | |
f2cedb63 | 940 | eth_hw_addr_random(dev); |
36226a8d | 941 | |
1da177e4 LT |
942 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
943 | break; | |
944 | } | |
945 | } | |
946 | ||
947 | /* Character device part */ | |
948 | ||
949 | /* Poll */ | |
c8d68e6b | 950 | static unsigned int tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 951 | { |
b2430de3 EB |
952 | struct tun_file *tfile = file->private_data; |
953 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 954 | struct sock *sk; |
33dccbb0 | 955 | unsigned int mask = 0; |
1da177e4 LT |
956 | |
957 | if (!tun) | |
eac9e902 | 958 | return POLLERR; |
1da177e4 | 959 | |
54f968d6 | 960 | sk = tfile->socket.sk; |
3c8a9c63 | 961 | |
6b8a66ee | 962 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 963 | |
54f968d6 | 964 | poll_wait(file, &tfile->wq.wait, wait); |
6aa20a22 | 965 | |
89f56d1e | 966 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
967 | mask |= POLLIN | POLLRDNORM; |
968 | ||
33dccbb0 HX |
969 | if (sock_writeable(sk) || |
970 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
971 | sock_writeable(sk))) | |
972 | mask |= POLLOUT | POLLWRNORM; | |
973 | ||
c70f1829 EB |
974 | if (tun->dev->reg_state != NETREG_REGISTERED) |
975 | mask = POLLERR; | |
976 | ||
631ab46b | 977 | tun_put(tun); |
1da177e4 LT |
978 | return mask; |
979 | } | |
980 | ||
f42157cb RR |
981 | /* prepad is the amount to reserve at front. len is length after that. |
982 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 983 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 984 | size_t prepad, size_t len, |
985 | size_t linear, int noblock) | |
f42157cb | 986 | { |
54f968d6 | 987 | struct sock *sk = tfile->socket.sk; |
f42157cb | 988 | struct sk_buff *skb; |
33dccbb0 | 989 | int err; |
f42157cb RR |
990 | |
991 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 992 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 993 | linear = len; |
f42157cb | 994 | |
33dccbb0 | 995 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
28d64271 | 996 | &err, 0); |
f42157cb | 997 | if (!skb) |
33dccbb0 | 998 | return ERR_PTR(err); |
f42157cb RR |
999 | |
1000 | skb_reserve(skb, prepad); | |
1001 | skb_put(skb, linear); | |
33dccbb0 HX |
1002 | skb->data_len = len - linear; |
1003 | skb->len += len - linear; | |
f42157cb RR |
1004 | |
1005 | return skb; | |
1006 | } | |
1007 | ||
1da177e4 | 1008 | /* Get packet from user space buffer */ |
54f968d6 JW |
1009 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
1010 | void *msg_control, const struct iovec *iv, | |
1011 | size_t total_len, size_t count, int noblock) | |
1da177e4 | 1012 | { |
09640e63 | 1013 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1014 | struct sk_buff *skb; |
3dd5c330 | 1015 | size_t len = total_len, align = NET_SKB_PAD, linear; |
f43798c2 | 1016 | struct virtio_net_hdr gso = { 0 }; |
96f8d9ec | 1017 | int good_linear; |
6f26c9a7 | 1018 | int offset = 0; |
0690899b MT |
1019 | int copylen; |
1020 | bool zerocopy = false; | |
1021 | int err; | |
49974420 | 1022 | u32 rxhash; |
1da177e4 LT |
1023 | |
1024 | if (!(tun->flags & TUN_NO_PI)) { | |
15718ea0 | 1025 | if (len < sizeof(pi)) |
1da177e4 | 1026 | return -EINVAL; |
15718ea0 | 1027 | len -= sizeof(pi); |
1da177e4 | 1028 | |
6f26c9a7 | 1029 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 1030 | return -EFAULT; |
6f26c9a7 | 1031 | offset += sizeof(pi); |
1da177e4 LT |
1032 | } |
1033 | ||
f43798c2 | 1034 | if (tun->flags & TUN_VNET_HDR) { |
15718ea0 | 1035 | if (len < tun->vnet_hdr_sz) |
f43798c2 | 1036 | return -EINVAL; |
15718ea0 | 1037 | len -= tun->vnet_hdr_sz; |
f43798c2 | 1038 | |
6f26c9a7 | 1039 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
1040 | return -EFAULT; |
1041 | ||
4909122f HX |
1042 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
1043 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
1044 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
1045 | ||
f43798c2 RR |
1046 | if (gso.hdr_len > len) |
1047 | return -EINVAL; | |
d9d52b51 | 1048 | offset += tun->vnet_hdr_sz; |
f43798c2 RR |
1049 | } |
1050 | ||
e01bf1c8 | 1051 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
a504b86e | 1052 | align += NET_IP_ALIGN; |
0eca93bc HX |
1053 | if (unlikely(len < ETH_HLEN || |
1054 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
1055 | return -EINVAL; |
1056 | } | |
6aa20a22 | 1057 | |
96f8d9ec JW |
1058 | good_linear = SKB_MAX_HEAD(align); |
1059 | ||
88529176 JW |
1060 | if (msg_control) { |
1061 | /* There are 256 bytes to be copied in skb, so there is | |
1062 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1063 | * The rest of the buffer is mapped from userspace. |
1064 | */ | |
88529176 | 1065 | copylen = gso.hdr_len ? gso.hdr_len : GOODCOPY_LEN; |
96f8d9ec JW |
1066 | if (copylen > good_linear) |
1067 | copylen = good_linear; | |
3dd5c330 | 1068 | linear = copylen; |
88529176 JW |
1069 | if (iov_pages(iv, offset + copylen, count) <= MAX_SKB_FRAGS) |
1070 | zerocopy = true; | |
1071 | } | |
1072 | ||
1073 | if (!zerocopy) { | |
0690899b | 1074 | copylen = len; |
96f8d9ec JW |
1075 | if (gso.hdr_len > good_linear) |
1076 | linear = good_linear; | |
1077 | else | |
1078 | linear = gso.hdr_len; | |
3dd5c330 | 1079 | } |
0690899b | 1080 | |
3dd5c330 | 1081 | skb = tun_alloc_skb(tfile, align, copylen, linear, noblock); |
33dccbb0 HX |
1082 | if (IS_ERR(skb)) { |
1083 | if (PTR_ERR(skb) != -EAGAIN) | |
1084 | tun->dev->stats.rx_dropped++; | |
1085 | return PTR_ERR(skb); | |
1da177e4 LT |
1086 | } |
1087 | ||
0690899b MT |
1088 | if (zerocopy) |
1089 | err = zerocopy_sg_from_iovec(skb, iv, offset, count); | |
88529176 | 1090 | else { |
0690899b | 1091 | err = skb_copy_datagram_from_iovec(skb, 0, iv, offset, len); |
88529176 JW |
1092 | if (!err && msg_control) { |
1093 | struct ubuf_info *uarg = msg_control; | |
1094 | uarg->callback(uarg, false); | |
1095 | } | |
1096 | } | |
0690899b MT |
1097 | |
1098 | if (err) { | |
09f75cd7 | 1099 | tun->dev->stats.rx_dropped++; |
8f22757e | 1100 | kfree_skb(skb); |
1da177e4 | 1101 | return -EFAULT; |
8f22757e | 1102 | } |
1da177e4 | 1103 | |
f43798c2 RR |
1104 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
1105 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
1106 | gso.csum_offset)) { | |
1107 | tun->dev->stats.rx_frame_errors++; | |
1108 | kfree_skb(skb); | |
1109 | return -EINVAL; | |
1110 | } | |
88255375 | 1111 | } |
f43798c2 | 1112 | |
1da177e4 LT |
1113 | switch (tun->flags & TUN_TYPE_MASK) { |
1114 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
1115 | if (tun->flags & TUN_NO_PI) { |
1116 | switch (skb->data[0] & 0xf0) { | |
1117 | case 0x40: | |
1118 | pi.proto = htons(ETH_P_IP); | |
1119 | break; | |
1120 | case 0x60: | |
1121 | pi.proto = htons(ETH_P_IPV6); | |
1122 | break; | |
1123 | default: | |
1124 | tun->dev->stats.rx_dropped++; | |
1125 | kfree_skb(skb); | |
1126 | return -EINVAL; | |
1127 | } | |
1128 | } | |
1129 | ||
459a98ed | 1130 | skb_reset_mac_header(skb); |
1da177e4 | 1131 | skb->protocol = pi.proto; |
4c13eb66 | 1132 | skb->dev = tun->dev; |
1da177e4 LT |
1133 | break; |
1134 | case TUN_TAP_DEV: | |
1135 | skb->protocol = eth_type_trans(skb, tun->dev); | |
1136 | break; | |
6403eab1 | 1137 | } |
1da177e4 | 1138 | |
f43798c2 RR |
1139 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
1140 | pr_debug("GSO!\n"); | |
1141 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1142 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
c9af6db4 | 1143 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
f43798c2 RR |
1144 | break; |
1145 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
c9af6db4 | 1146 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
f43798c2 | 1147 | break; |
e36aa25a | 1148 | case VIRTIO_NET_HDR_GSO_UDP: |
c9af6db4 | 1149 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
e36aa25a | 1150 | break; |
f43798c2 RR |
1151 | default: |
1152 | tun->dev->stats.rx_frame_errors++; | |
1153 | kfree_skb(skb); | |
1154 | return -EINVAL; | |
1155 | } | |
1156 | ||
1157 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
c9af6db4 | 1158 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
f43798c2 RR |
1159 | |
1160 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
1161 | if (skb_shinfo(skb)->gso_size == 0) { | |
1162 | tun->dev->stats.rx_frame_errors++; | |
1163 | kfree_skb(skb); | |
1164 | return -EINVAL; | |
1165 | } | |
1166 | ||
1167 | /* Header must be checked, and gso_segs computed. */ | |
1168 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1169 | skb_shinfo(skb)->gso_segs = 0; | |
1170 | } | |
6aa20a22 | 1171 | |
0690899b MT |
1172 | /* copy skb_ubuf_info for callback when skb has no error */ |
1173 | if (zerocopy) { | |
1174 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1175 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
c9af6db4 | 1176 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
0690899b MT |
1177 | } |
1178 | ||
76fe4581 | 1179 | skb_reset_network_header(skb); |
40893fd0 | 1180 | skb_probe_transport_header(skb, 0); |
38502af7 | 1181 | |
3958afa1 | 1182 | rxhash = skb_get_hash(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 | |
9e85722d | 1188 | tun_flow_update(tun, rxhash, tfile); |
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; | |
e6fd07c8 | 1220 | int vlan_offset = 0, copied; |
1da177e4 LT |
1221 | |
1222 | if (!(tun->flags & TUN_NO_PI)) { | |
1223 | if ((len -= sizeof(pi)) < 0) | |
1224 | return -EINVAL; | |
1225 | ||
1226 | if (len < skb->len) { | |
1227 | /* Packet will be striped */ | |
1228 | pi.flags |= TUN_PKT_STRIP; | |
1229 | } | |
6aa20a22 | 1230 | |
43b39dcd | 1231 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
1232 | return -EFAULT; |
1233 | total += sizeof(pi); | |
6aa20a22 | 1234 | } |
1da177e4 | 1235 | |
f43798c2 RR |
1236 | if (tun->flags & TUN_VNET_HDR) { |
1237 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
d9d52b51 | 1238 | if ((len -= tun->vnet_hdr_sz) < 0) |
f43798c2 RR |
1239 | return -EINVAL; |
1240 | ||
1241 | if (skb_is_gso(skb)) { | |
1242 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1243 | ||
1244 | /* This is a hint as to how much should be linear. */ | |
1245 | gso.hdr_len = skb_headlen(skb); | |
1246 | gso.gso_size = sinfo->gso_size; | |
1247 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1248 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1249 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1250 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e36aa25a SS |
1251 | else if (sinfo->gso_type & SKB_GSO_UDP) |
1252 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
ef3db4a5 | 1253 | else { |
6b8a66ee | 1254 | pr_err("unexpected GSO type: " |
ef3db4a5 MT |
1255 | "0x%x, gso_size %d, hdr_len %d\n", |
1256 | sinfo->gso_type, gso.gso_size, | |
1257 | gso.hdr_len); | |
1258 | print_hex_dump(KERN_ERR, "tun: ", | |
1259 | DUMP_PREFIX_NONE, | |
1260 | 16, 1, skb->head, | |
1261 | min((int)gso.hdr_len, 64), true); | |
1262 | WARN_ON_ONCE(1); | |
1263 | return -EINVAL; | |
1264 | } | |
f43798c2 RR |
1265 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
1266 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1267 | } else | |
1268 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1269 | ||
1270 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1271 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 1272 | gso.csum_start = skb_checksum_start_offset(skb); |
f43798c2 | 1273 | gso.csum_offset = skb->csum_offset; |
10a8d94a JW |
1274 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
1275 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
f43798c2 RR |
1276 | } /* else everything is zero */ |
1277 | ||
43b39dcd MT |
1278 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
1279 | sizeof(gso)))) | |
f43798c2 | 1280 | return -EFAULT; |
d9d52b51 | 1281 | total += tun->vnet_hdr_sz; |
f43798c2 RR |
1282 | } |
1283 | ||
e6fd07c8 JW |
1284 | copied = total; |
1285 | total += skb->len; | |
6680ec68 JW |
1286 | if (!vlan_tx_tag_present(skb)) { |
1287 | len = min_t(int, skb->len, len); | |
1288 | } else { | |
1289 | int copy, ret; | |
1290 | struct { | |
1291 | __be16 h_vlan_proto; | |
1292 | __be16 h_vlan_TCI; | |
1293 | } veth; | |
1294 | ||
1295 | veth.h_vlan_proto = skb->vlan_proto; | |
1296 | veth.h_vlan_TCI = htons(vlan_tx_tag_get(skb)); | |
1297 | ||
1298 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
1299 | len = min_t(int, skb->len + VLAN_HLEN, len); | |
e6fd07c8 | 1300 | total += VLAN_HLEN; |
6680ec68 JW |
1301 | |
1302 | copy = min_t(int, vlan_offset, len); | |
e6fd07c8 | 1303 | ret = skb_copy_datagram_const_iovec(skb, 0, iv, copied, copy); |
6680ec68 | 1304 | len -= copy; |
e6fd07c8 | 1305 | copied += copy; |
6680ec68 JW |
1306 | if (ret || !len) |
1307 | goto done; | |
1308 | ||
1309 | copy = min_t(int, sizeof(veth), len); | |
e6fd07c8 | 1310 | ret = memcpy_toiovecend(iv, (void *)&veth, copied, copy); |
6680ec68 | 1311 | len -= copy; |
e6fd07c8 | 1312 | copied += copy; |
6680ec68 JW |
1313 | if (ret || !len) |
1314 | goto done; | |
1315 | } | |
1da177e4 | 1316 | |
e6fd07c8 | 1317 | skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len); |
1da177e4 | 1318 | |
6680ec68 | 1319 | done: |
09f75cd7 JG |
1320 | tun->dev->stats.tx_packets++; |
1321 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
1322 | |
1323 | return total; | |
1324 | } | |
1325 | ||
54f968d6 | 1326 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
f96eb74c | 1327 | const struct iovec *iv, ssize_t len, int noblock) |
1da177e4 | 1328 | { |
1da177e4 LT |
1329 | DECLARE_WAITQUEUE(wait, current); |
1330 | struct sk_buff *skb; | |
05c2828c | 1331 | ssize_t ret = 0; |
1da177e4 | 1332 | |
3872baf6 | 1333 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 1334 | |
61a5ff15 | 1335 | if (unlikely(!noblock)) |
54f968d6 | 1336 | add_wait_queue(&tfile->wq.wait, &wait); |
1da177e4 | 1337 | while (len) { |
5c0c52c9 MT |
1338 | if (unlikely(!noblock)) |
1339 | current->state = TASK_INTERRUPTIBLE; | |
1da177e4 LT |
1340 | |
1341 | /* Read frames from the queue */ | |
54f968d6 | 1342 | if (!(skb = skb_dequeue(&tfile->socket.sk->sk_receive_queue))) { |
05c2828c | 1343 | if (noblock) { |
1da177e4 LT |
1344 | ret = -EAGAIN; |
1345 | break; | |
1346 | } | |
1347 | if (signal_pending(current)) { | |
1348 | ret = -ERESTARTSYS; | |
1349 | break; | |
1350 | } | |
c70f1829 EB |
1351 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
1352 | ret = -EIO; | |
1353 | break; | |
1354 | } | |
1da177e4 LT |
1355 | |
1356 | /* Nothing to read, let's sleep */ | |
1357 | schedule(); | |
1358 | continue; | |
1359 | } | |
1da177e4 | 1360 | |
54f968d6 | 1361 | ret = tun_put_user(tun, tfile, skb, iv, len); |
f271b2cc MK |
1362 | kfree_skb(skb); |
1363 | break; | |
1da177e4 LT |
1364 | } |
1365 | ||
5c0c52c9 MT |
1366 | if (unlikely(!noblock)) { |
1367 | current->state = TASK_RUNNING; | |
54f968d6 | 1368 | remove_wait_queue(&tfile->wq.wait, &wait); |
5c0c52c9 | 1369 | } |
1da177e4 | 1370 | |
05c2828c MT |
1371 | return ret; |
1372 | } | |
1373 | ||
1374 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
1375 | unsigned long count, loff_t pos) | |
1376 | { | |
1377 | struct file *file = iocb->ki_filp; | |
1378 | struct tun_file *tfile = file->private_data; | |
1379 | struct tun_struct *tun = __tun_get(tfile); | |
1380 | ssize_t len, ret; | |
1381 | ||
1382 | if (!tun) | |
1383 | return -EBADFD; | |
1384 | len = iov_length(iv, count); | |
1385 | if (len < 0) { | |
1386 | ret = -EINVAL; | |
1387 | goto out; | |
1388 | } | |
1389 | ||
f96eb74c | 1390 | ret = tun_do_read(tun, tfile, iv, len, |
54f968d6 | 1391 | file->f_flags & O_NONBLOCK); |
42404c09 | 1392 | ret = min_t(ssize_t, ret, len); |
d0b7da8a ZYW |
1393 | if (ret > 0) |
1394 | iocb->ki_pos = ret; | |
631ab46b EB |
1395 | out: |
1396 | tun_put(tun); | |
1da177e4 LT |
1397 | return ret; |
1398 | } | |
1399 | ||
96442e42 JW |
1400 | static void tun_free_netdev(struct net_device *dev) |
1401 | { | |
1402 | struct tun_struct *tun = netdev_priv(dev); | |
1403 | ||
4008e97f | 1404 | BUG_ON(!(list_empty(&tun->disabled))); |
96442e42 | 1405 | tun_flow_uninit(tun); |
5dbbaf2d | 1406 | security_tun_dev_free_security(tun->security); |
96442e42 JW |
1407 | free_netdev(dev); |
1408 | } | |
1409 | ||
1da177e4 LT |
1410 | static void tun_setup(struct net_device *dev) |
1411 | { | |
1412 | struct tun_struct *tun = netdev_priv(dev); | |
1413 | ||
0625c883 EB |
1414 | tun->owner = INVALID_UID; |
1415 | tun->group = INVALID_GID; | |
1da177e4 | 1416 | |
1da177e4 | 1417 | dev->ethtool_ops = &tun_ethtool_ops; |
96442e42 | 1418 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
1419 | } |
1420 | ||
f019a7a5 EB |
1421 | /* Trivial set of netlink ops to allow deleting tun or tap |
1422 | * device with netlink. | |
1423 | */ | |
1424 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1425 | { | |
1426 | return -EINVAL; | |
1427 | } | |
1428 | ||
1429 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1430 | .kind = DRV_NAME, | |
1431 | .priv_size = sizeof(struct tun_struct), | |
1432 | .setup = tun_setup, | |
1433 | .validate = tun_validate, | |
1434 | }; | |
1435 | ||
33dccbb0 HX |
1436 | static void tun_sock_write_space(struct sock *sk) |
1437 | { | |
54f968d6 | 1438 | struct tun_file *tfile; |
43815482 | 1439 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1440 | |
1441 | if (!sock_writeable(sk)) | |
1442 | return; | |
1443 | ||
33dccbb0 HX |
1444 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
1445 | return; | |
1446 | ||
43815482 ED |
1447 | wqueue = sk_sleep(sk); |
1448 | if (wqueue && waitqueue_active(wqueue)) | |
1449 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1450 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1451 | |
54f968d6 JW |
1452 | tfile = container_of(sk, struct tun_file, sk); |
1453 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
1454 | } |
1455 | ||
05c2828c MT |
1456 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
1457 | struct msghdr *m, size_t total_len) | |
1458 | { | |
54f968d6 JW |
1459 | int ret; |
1460 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1461 | struct tun_struct *tun = __tun_get(tfile); | |
1462 | ||
1463 | if (!tun) | |
1464 | return -EBADFD; | |
54f968d6 JW |
1465 | ret = tun_get_user(tun, tfile, m->msg_control, m->msg_iov, total_len, |
1466 | m->msg_iovlen, m->msg_flags & MSG_DONTWAIT); | |
1467 | tun_put(tun); | |
1468 | return ret; | |
05c2828c MT |
1469 | } |
1470 | ||
1471 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1472 | struct msghdr *m, size_t total_len, | |
1473 | int flags) | |
1474 | { | |
54f968d6 JW |
1475 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
1476 | struct tun_struct *tun = __tun_get(tfile); | |
05c2828c | 1477 | int ret; |
54f968d6 JW |
1478 | |
1479 | if (!tun) | |
1480 | return -EBADFD; | |
1481 | ||
eda29772 | 1482 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
3811ae76 G |
1483 | ret = -EINVAL; |
1484 | goto out; | |
1485 | } | |
eda29772 RC |
1486 | if (flags & MSG_ERRQUEUE) { |
1487 | ret = sock_recv_errqueue(sock->sk, m, total_len, | |
1488 | SOL_PACKET, TUN_TX_TIMESTAMP); | |
1489 | goto out; | |
1490 | } | |
f96eb74c | 1491 | ret = tun_do_read(tun, tfile, m->msg_iov, total_len, |
05c2828c | 1492 | flags & MSG_DONTWAIT); |
42404c09 DM |
1493 | if (ret > total_len) { |
1494 | m->msg_flags |= MSG_TRUNC; | |
1495 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1496 | } | |
3811ae76 | 1497 | out: |
54f968d6 | 1498 | tun_put(tun); |
05c2828c MT |
1499 | return ret; |
1500 | } | |
1501 | ||
1ab5ecb9 SK |
1502 | static int tun_release(struct socket *sock) |
1503 | { | |
1504 | if (sock->sk) | |
1505 | sock_put(sock->sk); | |
1506 | return 0; | |
1507 | } | |
1508 | ||
05c2828c MT |
1509 | /* Ops structure to mimic raw sockets with tun */ |
1510 | static const struct proto_ops tun_socket_ops = { | |
1511 | .sendmsg = tun_sendmsg, | |
1512 | .recvmsg = tun_recvmsg, | |
1ab5ecb9 | 1513 | .release = tun_release, |
05c2828c MT |
1514 | }; |
1515 | ||
33dccbb0 HX |
1516 | static struct proto tun_proto = { |
1517 | .name = "tun", | |
1518 | .owner = THIS_MODULE, | |
54f968d6 | 1519 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 1520 | }; |
f019a7a5 | 1521 | |
980c9e8c DW |
1522 | static int tun_flags(struct tun_struct *tun) |
1523 | { | |
1524 | int flags = 0; | |
1525 | ||
1526 | if (tun->flags & TUN_TUN_DEV) | |
1527 | flags |= IFF_TUN; | |
1528 | else | |
1529 | flags |= IFF_TAP; | |
1530 | ||
1531 | if (tun->flags & TUN_NO_PI) | |
1532 | flags |= IFF_NO_PI; | |
1533 | ||
5d097109 MT |
1534 | /* This flag has no real effect. We track the value for backwards |
1535 | * compatibility. | |
1536 | */ | |
980c9e8c DW |
1537 | if (tun->flags & TUN_ONE_QUEUE) |
1538 | flags |= IFF_ONE_QUEUE; | |
1539 | ||
1540 | if (tun->flags & TUN_VNET_HDR) | |
1541 | flags |= IFF_VNET_HDR; | |
1542 | ||
c8d68e6b JW |
1543 | if (tun->flags & TUN_TAP_MQ) |
1544 | flags |= IFF_MULTI_QUEUE; | |
1545 | ||
274038f8 PE |
1546 | if (tun->flags & TUN_PERSIST) |
1547 | flags |= IFF_PERSIST; | |
1548 | ||
980c9e8c DW |
1549 | return flags; |
1550 | } | |
1551 | ||
1552 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1553 | char *buf) | |
1554 | { | |
1555 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1556 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1557 | } | |
1558 | ||
1559 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1560 | char *buf) | |
1561 | { | |
1562 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1563 | return uid_valid(tun->owner)? |
1564 | sprintf(buf, "%u\n", | |
1565 | from_kuid_munged(current_user_ns(), tun->owner)): | |
1566 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1567 | } |
1568 | ||
1569 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1570 | char *buf) | |
1571 | { | |
1572 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1573 | return gid_valid(tun->group) ? |
1574 | sprintf(buf, "%u\n", | |
1575 | from_kgid_munged(current_user_ns(), tun->group)): | |
1576 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1577 | } |
1578 | ||
1579 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1580 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1581 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1582 | ||
d647a591 | 1583 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
1584 | { |
1585 | struct tun_struct *tun; | |
54f968d6 | 1586 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
1587 | struct net_device *dev; |
1588 | int err; | |
1589 | ||
7c0c3b1a JW |
1590 | if (tfile->detached) |
1591 | return -EINVAL; | |
1592 | ||
74a3e5a7 EB |
1593 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1594 | if (dev) { | |
f85ba780 DW |
1595 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1596 | return -EBUSY; | |
74a3e5a7 EB |
1597 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1598 | tun = netdev_priv(dev); | |
1599 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1600 | tun = netdev_priv(dev); | |
1601 | else | |
1602 | return -EINVAL; | |
1603 | ||
8e6d91ae JW |
1604 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
1605 | !!(tun->flags & TUN_TAP_MQ)) | |
1606 | return -EINVAL; | |
1607 | ||
cde8b15f | 1608 | if (tun_not_capable(tun)) |
2b980dbd | 1609 | return -EPERM; |
5dbbaf2d | 1610 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
1611 | if (err < 0) |
1612 | return err; | |
1613 | ||
849c9b6f | 1614 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER); |
a7385ba2 EB |
1615 | if (err < 0) |
1616 | return err; | |
4008e97f JW |
1617 | |
1618 | if (tun->flags & TUN_TAP_MQ && | |
e8dbad66 JW |
1619 | (tun->numqueues + tun->numdisabled > 1)) { |
1620 | /* One or more queue has already been attached, no need | |
1621 | * to initialize the device again. | |
1622 | */ | |
1623 | return 0; | |
1624 | } | |
6aa20a22 | 1625 | } |
1da177e4 LT |
1626 | else { |
1627 | char *name; | |
1628 | unsigned long flags = 0; | |
edfb6a14 JW |
1629 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
1630 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 1631 | |
c260b772 | 1632 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 1633 | return -EPERM; |
2b980dbd PM |
1634 | err = security_tun_dev_create(); |
1635 | if (err < 0) | |
1636 | return err; | |
ca6bb5d7 | 1637 | |
1da177e4 LT |
1638 | /* Set dev type */ |
1639 | if (ifr->ifr_flags & IFF_TUN) { | |
1640 | /* TUN device */ | |
1641 | flags |= TUN_TUN_DEV; | |
1642 | name = "tun%d"; | |
1643 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1644 | /* TAP device */ | |
1645 | flags |= TUN_TAP_DEV; | |
1646 | name = "tap%d"; | |
6aa20a22 | 1647 | } else |
36989b90 | 1648 | return -EINVAL; |
6aa20a22 | 1649 | |
1da177e4 LT |
1650 | if (*ifr->ifr_name) |
1651 | name = ifr->ifr_name; | |
1652 | ||
c8d68e6b | 1653 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
edfb6a14 JW |
1654 | tun_setup, queues, queues); |
1655 | ||
1da177e4 LT |
1656 | if (!dev) |
1657 | return -ENOMEM; | |
1658 | ||
fc54c658 | 1659 | dev_net_set(dev, net); |
f019a7a5 | 1660 | dev->rtnl_link_ops = &tun_link_ops; |
fb7589a1 | 1661 | dev->ifindex = tfile->ifindex; |
758e43b7 | 1662 | |
1da177e4 LT |
1663 | tun = netdev_priv(dev); |
1664 | tun->dev = dev; | |
1665 | tun->flags = flags; | |
f271b2cc | 1666 | tun->txflt.count = 0; |
d9d52b51 | 1667 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 1668 | |
54f968d6 JW |
1669 | tun->filter_attached = false; |
1670 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
33dccbb0 | 1671 | |
96442e42 JW |
1672 | spin_lock_init(&tun->lock); |
1673 | ||
5dbbaf2d PM |
1674 | err = security_tun_dev_alloc_security(&tun->security); |
1675 | if (err < 0) | |
1676 | goto err_free_dev; | |
2b980dbd | 1677 | |
1da177e4 | 1678 | tun_net_init(dev); |
944a1376 | 1679 | tun_flow_init(tun); |
96442e42 | 1680 | |
88255375 | 1681 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
6680ec68 JW |
1682 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
1683 | NETIF_F_HW_VLAN_STAG_TX; | |
88255375 | 1684 | dev->features = dev->hw_features; |
c0317998 | 1685 | dev->vlan_features = dev->features; |
88255375 | 1686 | |
4008e97f | 1687 | INIT_LIST_HEAD(&tun->disabled); |
849c9b6f | 1688 | err = tun_attach(tun, file, false); |
eb0fb363 | 1689 | if (err < 0) |
662ca437 | 1690 | goto err_free_flow; |
eb0fb363 | 1691 | |
1da177e4 LT |
1692 | err = register_netdevice(tun->dev); |
1693 | if (err < 0) | |
662ca437 | 1694 | goto err_detach; |
9c3fea6a | 1695 | |
980c9e8c DW |
1696 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1697 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1698 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
6b8a66ee | 1699 | pr_err("Failed to create tun sysfs files\n"); |
1da177e4 LT |
1700 | } |
1701 | ||
af668b3c MT |
1702 | netif_carrier_on(tun->dev); |
1703 | ||
6b8a66ee | 1704 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 LT |
1705 | |
1706 | if (ifr->ifr_flags & IFF_NO_PI) | |
1707 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1708 | else |
1709 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 | 1710 | |
5d097109 MT |
1711 | /* This flag has no real effect. We track the value for backwards |
1712 | * compatibility. | |
1713 | */ | |
1da177e4 LT |
1714 | if (ifr->ifr_flags & IFF_ONE_QUEUE) |
1715 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1716 | else |
1717 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1718 | |
f43798c2 RR |
1719 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1720 | tun->flags |= TUN_VNET_HDR; | |
1721 | else | |
1722 | tun->flags &= ~TUN_VNET_HDR; | |
1723 | ||
c8d68e6b JW |
1724 | if (ifr->ifr_flags & IFF_MULTI_QUEUE) |
1725 | tun->flags |= TUN_TAP_MQ; | |
1726 | else | |
1727 | tun->flags &= ~TUN_TAP_MQ; | |
1728 | ||
e35259a9 MK |
1729 | /* Make sure persistent devices do not get stuck in |
1730 | * xoff state. | |
1731 | */ | |
1732 | if (netif_running(tun->dev)) | |
c8d68e6b | 1733 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 1734 | |
1da177e4 LT |
1735 | strcpy(ifr->ifr_name, tun->dev->name); |
1736 | return 0; | |
1737 | ||
662ca437 JW |
1738 | err_detach: |
1739 | tun_detach_all(dev); | |
1740 | err_free_flow: | |
1741 | tun_flow_uninit(tun); | |
1742 | security_tun_dev_free_security(tun->security); | |
1743 | err_free_dev: | |
1da177e4 | 1744 | free_netdev(dev); |
1da177e4 LT |
1745 | return err; |
1746 | } | |
1747 | ||
9ce99cf6 | 1748 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 1749 | struct ifreq *ifr) |
e3b99556 | 1750 | { |
6b8a66ee | 1751 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1752 | |
1753 | strcpy(ifr->ifr_name, tun->dev->name); | |
1754 | ||
980c9e8c | 1755 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 1756 | |
e3b99556 MM |
1757 | } |
1758 | ||
5228ddc9 RR |
1759 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1760 | * privs required. */ | |
88255375 | 1761 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1762 | { |
c8f44aff | 1763 | netdev_features_t features = 0; |
5228ddc9 RR |
1764 | |
1765 | if (arg & TUN_F_CSUM) { | |
88255375 | 1766 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1767 | arg &= ~TUN_F_CSUM; |
1768 | ||
1769 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1770 | if (arg & TUN_F_TSO_ECN) { | |
1771 | features |= NETIF_F_TSO_ECN; | |
1772 | arg &= ~TUN_F_TSO_ECN; | |
1773 | } | |
1774 | if (arg & TUN_F_TSO4) | |
1775 | features |= NETIF_F_TSO; | |
1776 | if (arg & TUN_F_TSO6) | |
1777 | features |= NETIF_F_TSO6; | |
1778 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1779 | } | |
e36aa25a SS |
1780 | |
1781 | if (arg & TUN_F_UFO) { | |
1782 | features |= NETIF_F_UFO; | |
1783 | arg &= ~TUN_F_UFO; | |
1784 | } | |
5228ddc9 RR |
1785 | } |
1786 | ||
1787 | /* This gives the user a way to test for new features in future by | |
1788 | * trying to set them. */ | |
1789 | if (arg) | |
1790 | return -EINVAL; | |
1791 | ||
88255375 MM |
1792 | tun->set_features = features; |
1793 | netdev_update_features(tun->dev); | |
5228ddc9 RR |
1794 | |
1795 | return 0; | |
1796 | } | |
1797 | ||
c8d68e6b JW |
1798 | static void tun_detach_filter(struct tun_struct *tun, int n) |
1799 | { | |
1800 | int i; | |
1801 | struct tun_file *tfile; | |
1802 | ||
1803 | for (i = 0; i < n; i++) { | |
b8deabd3 | 1804 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1805 | sk_detach_filter(tfile->socket.sk); |
1806 | } | |
1807 | ||
1808 | tun->filter_attached = false; | |
1809 | } | |
1810 | ||
1811 | static int tun_attach_filter(struct tun_struct *tun) | |
1812 | { | |
1813 | int i, ret = 0; | |
1814 | struct tun_file *tfile; | |
1815 | ||
1816 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1817 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1818 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
1819 | if (ret) { | |
1820 | tun_detach_filter(tun, i); | |
1821 | return ret; | |
1822 | } | |
1823 | } | |
1824 | ||
1825 | tun->filter_attached = true; | |
1826 | return ret; | |
1827 | } | |
1828 | ||
1829 | static void tun_set_sndbuf(struct tun_struct *tun) | |
1830 | { | |
1831 | struct tun_file *tfile; | |
1832 | int i; | |
1833 | ||
1834 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1835 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1836 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
1837 | } | |
1838 | } | |
1839 | ||
cde8b15f JW |
1840 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
1841 | { | |
1842 | struct tun_file *tfile = file->private_data; | |
1843 | struct tun_struct *tun; | |
cde8b15f JW |
1844 | int ret = 0; |
1845 | ||
1846 | rtnl_lock(); | |
1847 | ||
1848 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 1849 | tun = tfile->detached; |
5dbbaf2d | 1850 | if (!tun) { |
cde8b15f | 1851 | ret = -EINVAL; |
5dbbaf2d PM |
1852 | goto unlock; |
1853 | } | |
1854 | ret = security_tun_dev_attach_queue(tun->security); | |
1855 | if (ret < 0) | |
1856 | goto unlock; | |
849c9b6f | 1857 | ret = tun_attach(tun, file, false); |
4008e97f | 1858 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 1859 | tun = rtnl_dereference(tfile->tun); |
9e85722d | 1860 | if (!tun || !(tun->flags & TUN_TAP_MQ) || tfile->detached) |
4008e97f JW |
1861 | ret = -EINVAL; |
1862 | else | |
1863 | __tun_detach(tfile, false); | |
1864 | } else | |
cde8b15f JW |
1865 | ret = -EINVAL; |
1866 | ||
5dbbaf2d | 1867 | unlock: |
cde8b15f JW |
1868 | rtnl_unlock(); |
1869 | return ret; | |
1870 | } | |
1871 | ||
50857e2a AB |
1872 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1873 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1874 | { |
36b50bab | 1875 | struct tun_file *tfile = file->private_data; |
631ab46b | 1876 | struct tun_struct *tun; |
1da177e4 LT |
1877 | void __user* argp = (void __user*)arg; |
1878 | struct ifreq ifr; | |
0625c883 EB |
1879 | kuid_t owner; |
1880 | kgid_t group; | |
33dccbb0 | 1881 | int sndbuf; |
d9d52b51 | 1882 | int vnet_hdr_sz; |
fb7589a1 | 1883 | unsigned int ifindex; |
f271b2cc | 1884 | int ret; |
1da177e4 | 1885 | |
cde8b15f | 1886 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) { |
50857e2a | 1887 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 1888 | return -EFAULT; |
8bbb1813 | 1889 | } else { |
a117dacd | 1890 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 1891 | } |
631ab46b EB |
1892 | if (cmd == TUNGETFEATURES) { |
1893 | /* Currently this just means: "what IFF flags are valid?". | |
1894 | * This is needed because we never checked for invalid flags on | |
1895 | * TUNSETIFF. */ | |
1896 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
cde8b15f | 1897 | IFF_VNET_HDR | IFF_MULTI_QUEUE, |
631ab46b | 1898 | (unsigned int __user*)argp); |
cde8b15f JW |
1899 | } else if (cmd == TUNSETQUEUE) |
1900 | return tun_set_queue(file, &ifr); | |
631ab46b | 1901 | |
c8d68e6b | 1902 | ret = 0; |
876bfd4d HX |
1903 | rtnl_lock(); |
1904 | ||
36b50bab | 1905 | tun = __tun_get(tfile); |
1da177e4 | 1906 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1907 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1908 | ||
876bfd4d | 1909 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1910 | |
876bfd4d HX |
1911 | if (ret) |
1912 | goto unlock; | |
1da177e4 | 1913 | |
50857e2a | 1914 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1915 | ret = -EFAULT; |
1916 | goto unlock; | |
1da177e4 | 1917 | } |
fb7589a1 PE |
1918 | if (cmd == TUNSETIFINDEX) { |
1919 | ret = -EPERM; | |
1920 | if (tun) | |
1921 | goto unlock; | |
1922 | ||
1923 | ret = -EFAULT; | |
1924 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) | |
1925 | goto unlock; | |
1926 | ||
1927 | ret = 0; | |
1928 | tfile->ifindex = ifindex; | |
1929 | goto unlock; | |
1930 | } | |
1da177e4 | 1931 | |
876bfd4d | 1932 | ret = -EBADFD; |
1da177e4 | 1933 | if (!tun) |
876bfd4d | 1934 | goto unlock; |
1da177e4 | 1935 | |
1e588338 | 1936 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 1937 | |
631ab46b | 1938 | ret = 0; |
1da177e4 | 1939 | switch (cmd) { |
e3b99556 | 1940 | case TUNGETIFF: |
9ce99cf6 | 1941 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1942 | |
3d407a80 PE |
1943 | if (tfile->detached) |
1944 | ifr.ifr_flags |= IFF_DETACH_QUEUE; | |
849c9b6f PE |
1945 | if (!tfile->socket.sk->sk_filter) |
1946 | ifr.ifr_flags |= IFF_NOFILTER; | |
3d407a80 | 1947 | |
50857e2a | 1948 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1949 | ret = -EFAULT; |
e3b99556 MM |
1950 | break; |
1951 | ||
1da177e4 LT |
1952 | case TUNSETNOCSUM: |
1953 | /* Disable/Enable checksum */ | |
1da177e4 | 1954 | |
88255375 MM |
1955 | /* [unimplemented] */ |
1956 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 1957 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
1958 | break; |
1959 | ||
1960 | case TUNSETPERSIST: | |
54f968d6 JW |
1961 | /* Disable/Enable persist mode. Keep an extra reference to the |
1962 | * module to prevent the module being unprobed. | |
1963 | */ | |
dd38bd85 | 1964 | if (arg && !(tun->flags & TUN_PERSIST)) { |
1da177e4 | 1965 | tun->flags |= TUN_PERSIST; |
54f968d6 | 1966 | __module_get(THIS_MODULE); |
dd38bd85 JW |
1967 | } |
1968 | if (!arg && (tun->flags & TUN_PERSIST)) { | |
1da177e4 | 1969 | tun->flags &= ~TUN_PERSIST; |
54f968d6 JW |
1970 | module_put(THIS_MODULE); |
1971 | } | |
1da177e4 | 1972 | |
6b8a66ee JP |
1973 | tun_debug(KERN_INFO, tun, "persist %s\n", |
1974 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
1975 | break; |
1976 | ||
1977 | case TUNSETOWNER: | |
1978 | /* Set owner of the device */ | |
0625c883 EB |
1979 | owner = make_kuid(current_user_ns(), arg); |
1980 | if (!uid_valid(owner)) { | |
1981 | ret = -EINVAL; | |
1982 | break; | |
1983 | } | |
1984 | tun->owner = owner; | |
1e588338 | 1985 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 1986 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
1987 | break; |
1988 | ||
8c644623 GG |
1989 | case TUNSETGROUP: |
1990 | /* Set group of the device */ | |
0625c883 EB |
1991 | group = make_kgid(current_user_ns(), arg); |
1992 | if (!gid_valid(group)) { | |
1993 | ret = -EINVAL; | |
1994 | break; | |
1995 | } | |
1996 | tun->group = group; | |
1e588338 | 1997 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 1998 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
1999 | break; |
2000 | ||
ff4cc3ac MK |
2001 | case TUNSETLINK: |
2002 | /* Only allow setting the type when the interface is down */ | |
2003 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
2004 | tun_debug(KERN_INFO, tun, |
2005 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 2006 | ret = -EBUSY; |
ff4cc3ac MK |
2007 | } else { |
2008 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
2009 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
2010 | tun->dev->type); | |
48abfe05 | 2011 | ret = 0; |
ff4cc3ac | 2012 | } |
631ab46b | 2013 | break; |
ff4cc3ac | 2014 | |
1da177e4 LT |
2015 | #ifdef TUN_DEBUG |
2016 | case TUNSETDEBUG: | |
2017 | tun->debug = arg; | |
2018 | break; | |
2019 | #endif | |
5228ddc9 | 2020 | case TUNSETOFFLOAD: |
88255375 | 2021 | ret = set_offload(tun, arg); |
631ab46b | 2022 | break; |
5228ddc9 | 2023 | |
f271b2cc MK |
2024 | case TUNSETTXFILTER: |
2025 | /* Can be set only for TAPs */ | |
631ab46b | 2026 | ret = -EINVAL; |
f271b2cc | 2027 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 2028 | break; |
c0e5a8c2 | 2029 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 2030 | break; |
1da177e4 LT |
2031 | |
2032 | case SIOCGIFHWADDR: | |
b595076a | 2033 | /* Get hw address */ |
f271b2cc MK |
2034 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
2035 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 2036 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
2037 | ret = -EFAULT; |
2038 | break; | |
1da177e4 LT |
2039 | |
2040 | case SIOCSIFHWADDR: | |
f271b2cc | 2041 | /* Set hw address */ |
6b8a66ee JP |
2042 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
2043 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 2044 | |
40102371 | 2045 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 2046 | break; |
33dccbb0 HX |
2047 | |
2048 | case TUNGETSNDBUF: | |
54f968d6 | 2049 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
2050 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
2051 | ret = -EFAULT; | |
2052 | break; | |
2053 | ||
2054 | case TUNSETSNDBUF: | |
2055 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
2056 | ret = -EFAULT; | |
2057 | break; | |
2058 | } | |
2059 | ||
c8d68e6b JW |
2060 | tun->sndbuf = sndbuf; |
2061 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
2062 | break; |
2063 | ||
d9d52b51 MT |
2064 | case TUNGETVNETHDRSZ: |
2065 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
2066 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
2067 | ret = -EFAULT; | |
2068 | break; | |
2069 | ||
2070 | case TUNSETVNETHDRSZ: | |
2071 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
2072 | ret = -EFAULT; | |
2073 | break; | |
2074 | } | |
2075 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
2076 | ret = -EINVAL; | |
2077 | break; | |
2078 | } | |
2079 | ||
2080 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
2081 | break; | |
2082 | ||
99405162 MT |
2083 | case TUNATTACHFILTER: |
2084 | /* Can be set only for TAPs */ | |
2085 | ret = -EINVAL; | |
2086 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2087 | break; | |
2088 | ret = -EFAULT; | |
54f968d6 | 2089 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
2090 | break; |
2091 | ||
c8d68e6b | 2092 | ret = tun_attach_filter(tun); |
99405162 MT |
2093 | break; |
2094 | ||
2095 | case TUNDETACHFILTER: | |
2096 | /* Can be set only for TAPs */ | |
2097 | ret = -EINVAL; | |
2098 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2099 | break; | |
c8d68e6b JW |
2100 | ret = 0; |
2101 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
2102 | break; |
2103 | ||
76975e9c PE |
2104 | case TUNGETFILTER: |
2105 | ret = -EINVAL; | |
2106 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2107 | break; | |
2108 | ret = -EFAULT; | |
2109 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) | |
2110 | break; | |
2111 | ret = 0; | |
2112 | break; | |
2113 | ||
1da177e4 | 2114 | default: |
631ab46b EB |
2115 | ret = -EINVAL; |
2116 | break; | |
ee289b64 | 2117 | } |
1da177e4 | 2118 | |
876bfd4d HX |
2119 | unlock: |
2120 | rtnl_unlock(); | |
2121 | if (tun) | |
2122 | tun_put(tun); | |
631ab46b | 2123 | return ret; |
1da177e4 LT |
2124 | } |
2125 | ||
50857e2a AB |
2126 | static long tun_chr_ioctl(struct file *file, |
2127 | unsigned int cmd, unsigned long arg) | |
2128 | { | |
2129 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
2130 | } | |
2131 | ||
2132 | #ifdef CONFIG_COMPAT | |
2133 | static long tun_chr_compat_ioctl(struct file *file, | |
2134 | unsigned int cmd, unsigned long arg) | |
2135 | { | |
2136 | switch (cmd) { | |
2137 | case TUNSETIFF: | |
2138 | case TUNGETIFF: | |
2139 | case TUNSETTXFILTER: | |
2140 | case TUNGETSNDBUF: | |
2141 | case TUNSETSNDBUF: | |
2142 | case SIOCGIFHWADDR: | |
2143 | case SIOCSIFHWADDR: | |
2144 | arg = (unsigned long)compat_ptr(arg); | |
2145 | break; | |
2146 | default: | |
2147 | arg = (compat_ulong_t)arg; | |
2148 | break; | |
2149 | } | |
2150 | ||
2151 | /* | |
2152 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
2153 | * the end of that structure. All fields that are used in this | |
2154 | * driver are compatible though, we don't need to convert the | |
2155 | * contents. | |
2156 | */ | |
2157 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
2158 | } | |
2159 | #endif /* CONFIG_COMPAT */ | |
2160 | ||
1da177e4 LT |
2161 | static int tun_chr_fasync(int fd, struct file *file, int on) |
2162 | { | |
54f968d6 | 2163 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2164 | int ret; |
2165 | ||
54f968d6 | 2166 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 2167 | goto out; |
6aa20a22 | 2168 | |
1da177e4 | 2169 | if (on) { |
609d7fa9 | 2170 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 2171 | if (ret) |
9d319522 | 2172 | goto out; |
54f968d6 | 2173 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 2174 | } else |
54f968d6 | 2175 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
2176 | ret = 0; |
2177 | out: | |
9d319522 | 2178 | return ret; |
1da177e4 LT |
2179 | } |
2180 | ||
2181 | static int tun_chr_open(struct inode *inode, struct file * file) | |
2182 | { | |
631ab46b | 2183 | struct tun_file *tfile; |
deed49fb | 2184 | |
6b8a66ee | 2185 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 2186 | |
54f968d6 JW |
2187 | tfile = (struct tun_file *)sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL, |
2188 | &tun_proto); | |
631ab46b EB |
2189 | if (!tfile) |
2190 | return -ENOMEM; | |
6e914fc7 | 2191 | rcu_assign_pointer(tfile->tun, NULL); |
36b50bab | 2192 | tfile->net = get_net(current->nsproxy->net_ns); |
54f968d6 | 2193 | tfile->flags = 0; |
fb7589a1 | 2194 | tfile->ifindex = 0; |
54f968d6 JW |
2195 | |
2196 | rcu_assign_pointer(tfile->socket.wq, &tfile->wq); | |
2197 | init_waitqueue_head(&tfile->wq.wait); | |
2198 | ||
2199 | tfile->socket.file = file; | |
2200 | tfile->socket.ops = &tun_socket_ops; | |
2201 | ||
2202 | sock_init_data(&tfile->socket, &tfile->sk); | |
2203 | sk_change_net(&tfile->sk, tfile->net); | |
2204 | ||
2205 | tfile->sk.sk_write_space = tun_sock_write_space; | |
2206 | tfile->sk.sk_sndbuf = INT_MAX; | |
2207 | ||
631ab46b | 2208 | file->private_data = tfile; |
54f968d6 | 2209 | set_bit(SOCK_EXTERNALLY_ALLOCATED, &tfile->socket.flags); |
4008e97f | 2210 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 2211 | |
19a6afb2 JW |
2212 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
2213 | ||
1da177e4 LT |
2214 | return 0; |
2215 | } | |
2216 | ||
2217 | static int tun_chr_close(struct inode *inode, struct file *file) | |
2218 | { | |
631ab46b | 2219 | struct tun_file *tfile = file->private_data; |
54f968d6 | 2220 | struct net *net = tfile->net; |
1da177e4 | 2221 | |
c8d68e6b | 2222 | tun_detach(tfile, true); |
54f968d6 | 2223 | put_net(net); |
1da177e4 LT |
2224 | |
2225 | return 0; | |
2226 | } | |
2227 | ||
d54b1fdb | 2228 | static const struct file_operations tun_fops = { |
6aa20a22 | 2229 | .owner = THIS_MODULE, |
1da177e4 | 2230 | .llseek = no_llseek, |
ee0b3e67 BP |
2231 | .read = do_sync_read, |
2232 | .aio_read = tun_chr_aio_read, | |
2233 | .write = do_sync_write, | |
2234 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 2235 | .poll = tun_chr_poll, |
50857e2a AB |
2236 | .unlocked_ioctl = tun_chr_ioctl, |
2237 | #ifdef CONFIG_COMPAT | |
2238 | .compat_ioctl = tun_chr_compat_ioctl, | |
2239 | #endif | |
1da177e4 LT |
2240 | .open = tun_chr_open, |
2241 | .release = tun_chr_close, | |
6aa20a22 | 2242 | .fasync = tun_chr_fasync |
1da177e4 LT |
2243 | }; |
2244 | ||
2245 | static struct miscdevice tun_miscdev = { | |
2246 | .minor = TUN_MINOR, | |
2247 | .name = "tun", | |
e454cea2 | 2248 | .nodename = "net/tun", |
1da177e4 | 2249 | .fops = &tun_fops, |
1da177e4 LT |
2250 | }; |
2251 | ||
2252 | /* ethtool interface */ | |
2253 | ||
2254 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
2255 | { | |
2256 | cmd->supported = 0; | |
2257 | cmd->advertising = 0; | |
70739497 | 2258 | ethtool_cmd_speed_set(cmd, SPEED_10); |
1da177e4 LT |
2259 | cmd->duplex = DUPLEX_FULL; |
2260 | cmd->port = PORT_TP; | |
2261 | cmd->phy_address = 0; | |
2262 | cmd->transceiver = XCVR_INTERNAL; | |
2263 | cmd->autoneg = AUTONEG_DISABLE; | |
2264 | cmd->maxtxpkt = 0; | |
2265 | cmd->maxrxpkt = 0; | |
2266 | return 0; | |
2267 | } | |
2268 | ||
2269 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
2270 | { | |
2271 | struct tun_struct *tun = netdev_priv(dev); | |
2272 | ||
33a5ba14 RJ |
2273 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
2274 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
2275 | |
2276 | switch (tun->flags & TUN_TYPE_MASK) { | |
2277 | case TUN_TUN_DEV: | |
33a5ba14 | 2278 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 LT |
2279 | break; |
2280 | case TUN_TAP_DEV: | |
33a5ba14 | 2281 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
2282 | break; |
2283 | } | |
2284 | } | |
2285 | ||
2286 | static u32 tun_get_msglevel(struct net_device *dev) | |
2287 | { | |
2288 | #ifdef TUN_DEBUG | |
2289 | struct tun_struct *tun = netdev_priv(dev); | |
2290 | return tun->debug; | |
2291 | #else | |
2292 | return -EOPNOTSUPP; | |
2293 | #endif | |
2294 | } | |
2295 | ||
2296 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
2297 | { | |
2298 | #ifdef TUN_DEBUG | |
2299 | struct tun_struct *tun = netdev_priv(dev); | |
2300 | tun->debug = value; | |
2301 | #endif | |
2302 | } | |
2303 | ||
7282d491 | 2304 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
2305 | .get_settings = tun_get_settings, |
2306 | .get_drvinfo = tun_get_drvinfo, | |
2307 | .get_msglevel = tun_get_msglevel, | |
2308 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 2309 | .get_link = ethtool_op_get_link, |
eda29772 | 2310 | .get_ts_info = ethtool_op_get_ts_info, |
1da177e4 LT |
2311 | }; |
2312 | ||
79d17604 | 2313 | |
1da177e4 LT |
2314 | static int __init tun_init(void) |
2315 | { | |
2316 | int ret = 0; | |
2317 | ||
6b8a66ee JP |
2318 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
2319 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 2320 | |
f019a7a5 | 2321 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 2322 | if (ret) { |
6b8a66ee | 2323 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 2324 | goto err_linkops; |
79d17604 PE |
2325 | } |
2326 | ||
1da177e4 | 2327 | ret = misc_register(&tun_miscdev); |
79d17604 | 2328 | if (ret) { |
6b8a66ee | 2329 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
2330 | goto err_misc; |
2331 | } | |
f019a7a5 | 2332 | return 0; |
79d17604 | 2333 | err_misc: |
f019a7a5 EB |
2334 | rtnl_link_unregister(&tun_link_ops); |
2335 | err_linkops: | |
1da177e4 LT |
2336 | return ret; |
2337 | } | |
2338 | ||
2339 | static void tun_cleanup(void) | |
2340 | { | |
6aa20a22 | 2341 | misc_deregister(&tun_miscdev); |
f019a7a5 | 2342 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
2343 | } |
2344 | ||
05c2828c MT |
2345 | /* Get an underlying socket object from tun file. Returns error unless file is |
2346 | * attached to a device. The returned object works like a packet socket, it | |
2347 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
2348 | * holding a reference to the file for as long as the socket is in use. */ | |
2349 | struct socket *tun_get_socket(struct file *file) | |
2350 | { | |
6e914fc7 | 2351 | struct tun_file *tfile; |
05c2828c MT |
2352 | if (file->f_op != &tun_fops) |
2353 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
2354 | tfile = file->private_data; |
2355 | if (!tfile) | |
05c2828c | 2356 | return ERR_PTR(-EBADFD); |
54f968d6 | 2357 | return &tfile->socket; |
05c2828c MT |
2358 | } |
2359 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
2360 | ||
1da177e4 LT |
2361 | module_init(tun_init); |
2362 | module_exit(tun_cleanup); | |
2363 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
2364 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
2365 | MODULE_LICENSE("GPL"); | |
2366 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 2367 | MODULE_ALIAS("devname:net/tun"); |