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 | */ | |
f663dd9a JW |
367 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, |
368 | void *accel_priv) | |
c8d68e6b JW |
369 | { |
370 | struct tun_struct *tun = netdev_priv(dev); | |
96442e42 | 371 | struct tun_flow_entry *e; |
c8d68e6b JW |
372 | u32 txq = 0; |
373 | u32 numqueues = 0; | |
374 | ||
375 | rcu_read_lock(); | |
92bb73ea | 376 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 377 | |
3958afa1 | 378 | txq = skb_get_hash(skb); |
c8d68e6b | 379 | if (txq) { |
96442e42 | 380 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
9bc88939 | 381 | if (e) { |
9bc88939 | 382 | tun_flow_save_rps_rxhash(e, txq); |
fbe4d456 | 383 | txq = e->queue_index; |
9bc88939 | 384 | } else |
96442e42 JW |
385 | /* use multiply and shift instead of expensive divide */ |
386 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
387 | } else if (likely(skb_rx_queue_recorded(skb))) { |
388 | txq = skb_get_rx_queue(skb); | |
389 | while (unlikely(txq >= numqueues)) | |
390 | txq -= numqueues; | |
391 | } | |
392 | ||
393 | rcu_read_unlock(); | |
394 | return txq; | |
395 | } | |
396 | ||
cde8b15f JW |
397 | static inline bool tun_not_capable(struct tun_struct *tun) |
398 | { | |
399 | const struct cred *cred = current_cred(); | |
c260b772 | 400 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
401 | |
402 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
403 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 404 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
405 | } |
406 | ||
c8d68e6b JW |
407 | static void tun_set_real_num_queues(struct tun_struct *tun) |
408 | { | |
409 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
410 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
411 | } | |
412 | ||
4008e97f JW |
413 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
414 | { | |
415 | tfile->detached = tun; | |
416 | list_add_tail(&tfile->next, &tun->disabled); | |
417 | ++tun->numdisabled; | |
418 | } | |
419 | ||
d32649d1 | 420 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
421 | { |
422 | struct tun_struct *tun = tfile->detached; | |
423 | ||
424 | tfile->detached = NULL; | |
425 | list_del_init(&tfile->next); | |
426 | --tun->numdisabled; | |
427 | return tun; | |
428 | } | |
429 | ||
4bfb0513 JW |
430 | static void tun_queue_purge(struct tun_file *tfile) |
431 | { | |
432 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
433 | skb_queue_purge(&tfile->sk.sk_error_queue); | |
434 | } | |
435 | ||
c8d68e6b JW |
436 | static void __tun_detach(struct tun_file *tfile, bool clean) |
437 | { | |
438 | struct tun_file *ntfile; | |
439 | struct tun_struct *tun; | |
c8d68e6b | 440 | |
b8deabd3 JW |
441 | tun = rtnl_dereference(tfile->tun); |
442 | ||
9e85722d | 443 | if (tun && !tfile->detached) { |
c8d68e6b JW |
444 | u16 index = tfile->queue_index; |
445 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
446 | |
447 | rcu_assign_pointer(tun->tfiles[index], | |
448 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 449 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
450 | ntfile->queue_index = index; |
451 | ||
452 | --tun->numqueues; | |
9e85722d JW |
453 | if (clean) { |
454 | rcu_assign_pointer(tfile->tun, NULL); | |
4008e97f | 455 | sock_put(&tfile->sk); |
9e85722d | 456 | } else |
4008e97f | 457 | tun_disable_queue(tun, tfile); |
c8d68e6b JW |
458 | |
459 | synchronize_net(); | |
96442e42 | 460 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b | 461 | /* Drop read queue */ |
4bfb0513 | 462 | tun_queue_purge(tfile); |
c8d68e6b | 463 | tun_set_real_num_queues(tun); |
dd38bd85 | 464 | } else if (tfile->detached && clean) { |
4008e97f | 465 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
466 | sock_put(&tfile->sk); |
467 | } | |
c8d68e6b JW |
468 | |
469 | if (clean) { | |
af668b3c MT |
470 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
471 | netif_carrier_off(tun->dev); | |
472 | ||
473 | if (!(tun->flags & TUN_PERSIST) && | |
474 | tun->dev->reg_state == NETREG_REGISTERED) | |
4008e97f | 475 | unregister_netdevice(tun->dev); |
af668b3c | 476 | } |
4008e97f | 477 | |
c8d68e6b JW |
478 | BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED, |
479 | &tfile->socket.flags)); | |
480 | sk_release_kernel(&tfile->sk); | |
481 | } | |
482 | } | |
483 | ||
484 | static void tun_detach(struct tun_file *tfile, bool clean) | |
485 | { | |
486 | rtnl_lock(); | |
487 | __tun_detach(tfile, clean); | |
488 | rtnl_unlock(); | |
489 | } | |
490 | ||
491 | static void tun_detach_all(struct net_device *dev) | |
492 | { | |
493 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 494 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
495 | int i, n = tun->numqueues; |
496 | ||
497 | for (i = 0; i < n; i++) { | |
b8deabd3 | 498 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
499 | BUG_ON(!tfile); |
500 | wake_up_all(&tfile->wq.wait); | |
501 | rcu_assign_pointer(tfile->tun, NULL); | |
502 | --tun->numqueues; | |
503 | } | |
9e85722d JW |
504 | list_for_each_entry(tfile, &tun->disabled, next) { |
505 | wake_up_all(&tfile->wq.wait); | |
506 | rcu_assign_pointer(tfile->tun, NULL); | |
507 | } | |
c8d68e6b JW |
508 | BUG_ON(tun->numqueues != 0); |
509 | ||
510 | synchronize_net(); | |
511 | for (i = 0; i < n; i++) { | |
b8deabd3 | 512 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 513 | /* Drop read queue */ |
4bfb0513 | 514 | tun_queue_purge(tfile); |
c8d68e6b JW |
515 | sock_put(&tfile->sk); |
516 | } | |
4008e97f JW |
517 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
518 | tun_enable_queue(tfile); | |
4bfb0513 | 519 | tun_queue_purge(tfile); |
4008e97f JW |
520 | sock_put(&tfile->sk); |
521 | } | |
522 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 JW |
523 | |
524 | if (tun->flags & TUN_PERSIST) | |
525 | module_put(THIS_MODULE); | |
c8d68e6b JW |
526 | } |
527 | ||
849c9b6f | 528 | static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filter) |
a7385ba2 | 529 | { |
631ab46b | 530 | struct tun_file *tfile = file->private_data; |
38231b7a | 531 | int err; |
a7385ba2 | 532 | |
5dbbaf2d PM |
533 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
534 | if (err < 0) | |
535 | goto out; | |
536 | ||
38231b7a | 537 | err = -EINVAL; |
9e85722d | 538 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
539 | goto out; |
540 | ||
541 | err = -EBUSY; | |
c8d68e6b JW |
542 | if (!(tun->flags & TUN_TAP_MQ) && tun->numqueues == 1) |
543 | goto out; | |
544 | ||
545 | err = -E2BIG; | |
4008e97f JW |
546 | if (!tfile->detached && |
547 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
548 | goto out; |
549 | ||
550 | err = 0; | |
54f968d6 | 551 | |
92d4ea6e | 552 | /* Re-attach the filter to persist device */ |
849c9b6f | 553 | if (!skip_filter && (tun->filter_attached == true)) { |
54f968d6 JW |
554 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
555 | if (!err) | |
556 | goto out; | |
557 | } | |
c8d68e6b | 558 | tfile->queue_index = tun->numqueues; |
6e914fc7 | 559 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 560 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 561 | tun->numqueues++; |
a7385ba2 | 562 | |
4008e97f JW |
563 | if (tfile->detached) |
564 | tun_enable_queue(tfile); | |
565 | else | |
566 | sock_hold(&tfile->sk); | |
567 | ||
c8d68e6b | 568 | tun_set_real_num_queues(tun); |
a7385ba2 | 569 | |
c8d68e6b JW |
570 | /* device is allowed to go away first, so no need to hold extra |
571 | * refcnt. | |
572 | */ | |
573 | ||
574 | out: | |
575 | return err; | |
631ab46b EB |
576 | } |
577 | ||
578 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
579 | { | |
6e914fc7 | 580 | struct tun_struct *tun; |
c70f1829 | 581 | |
6e914fc7 JW |
582 | rcu_read_lock(); |
583 | tun = rcu_dereference(tfile->tun); | |
584 | if (tun) | |
585 | dev_hold(tun->dev); | |
586 | rcu_read_unlock(); | |
c70f1829 EB |
587 | |
588 | return tun; | |
631ab46b EB |
589 | } |
590 | ||
591 | static struct tun_struct *tun_get(struct file *file) | |
592 | { | |
593 | return __tun_get(file->private_data); | |
594 | } | |
595 | ||
596 | static void tun_put(struct tun_struct *tun) | |
597 | { | |
6e914fc7 | 598 | dev_put(tun->dev); |
631ab46b EB |
599 | } |
600 | ||
6b8a66ee | 601 | /* TAP filtering */ |
f271b2cc MK |
602 | static void addr_hash_set(u32 *mask, const u8 *addr) |
603 | { | |
604 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
605 | mask[n >> 5] |= (1 << (n & 31)); | |
606 | } | |
607 | ||
608 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
609 | { | |
610 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
611 | return mask[n >> 5] & (1 << (n & 31)); | |
612 | } | |
613 | ||
614 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
615 | { | |
616 | struct { u8 u[ETH_ALEN]; } *addr; | |
617 | struct tun_filter uf; | |
618 | int err, alen, n, nexact; | |
619 | ||
620 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
621 | return -EFAULT; | |
622 | ||
623 | if (!uf.count) { | |
624 | /* Disabled */ | |
625 | filter->count = 0; | |
626 | return 0; | |
627 | } | |
628 | ||
629 | alen = ETH_ALEN * uf.count; | |
630 | addr = kmalloc(alen, GFP_KERNEL); | |
631 | if (!addr) | |
632 | return -ENOMEM; | |
633 | ||
634 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
635 | err = -EFAULT; | |
636 | goto done; | |
637 | } | |
638 | ||
639 | /* The filter is updated without holding any locks. Which is | |
640 | * perfectly safe. We disable it first and in the worst | |
641 | * case we'll accept a few undesired packets. */ | |
642 | filter->count = 0; | |
643 | wmb(); | |
644 | ||
645 | /* Use first set of addresses as an exact filter */ | |
646 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
647 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
648 | ||
649 | nexact = n; | |
650 | ||
cfbf84fc AW |
651 | /* Remaining multicast addresses are hashed, |
652 | * unicast will leave the filter disabled. */ | |
f271b2cc | 653 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
654 | for (; n < uf.count; n++) { |
655 | if (!is_multicast_ether_addr(addr[n].u)) { | |
656 | err = 0; /* no filter */ | |
657 | goto done; | |
658 | } | |
f271b2cc | 659 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 660 | } |
f271b2cc MK |
661 | |
662 | /* For ALLMULTI just set the mask to all ones. | |
663 | * This overrides the mask populated above. */ | |
664 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
665 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
666 | ||
667 | /* Now enable the filter */ | |
668 | wmb(); | |
669 | filter->count = nexact; | |
670 | ||
671 | /* Return the number of exact filters */ | |
672 | err = nexact; | |
673 | ||
674 | done: | |
675 | kfree(addr); | |
676 | return err; | |
677 | } | |
678 | ||
679 | /* Returns: 0 - drop, !=0 - accept */ | |
680 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
681 | { | |
682 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
683 | * at this point. */ | |
684 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
685 | int i; | |
686 | ||
687 | /* Exact match */ | |
688 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 689 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
690 | return 1; |
691 | ||
692 | /* Inexact match (multicast only) */ | |
693 | if (is_multicast_ether_addr(eh->h_dest)) | |
694 | return addr_hash_test(filter->mask, eh->h_dest); | |
695 | ||
696 | return 0; | |
697 | } | |
698 | ||
699 | /* | |
700 | * Checks whether the packet is accepted or not. | |
701 | * Returns: 0 - drop, !=0 - accept | |
702 | */ | |
703 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
704 | { | |
705 | if (!filter->count) | |
706 | return 1; | |
707 | ||
708 | return run_filter(filter, skb); | |
709 | } | |
710 | ||
1da177e4 LT |
711 | /* Network device part of the driver */ |
712 | ||
7282d491 | 713 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 714 | |
c70f1829 EB |
715 | /* Net device detach from fd. */ |
716 | static void tun_net_uninit(struct net_device *dev) | |
717 | { | |
c8d68e6b | 718 | tun_detach_all(dev); |
c70f1829 EB |
719 | } |
720 | ||
1da177e4 LT |
721 | /* Net device open. */ |
722 | static int tun_net_open(struct net_device *dev) | |
723 | { | |
c8d68e6b | 724 | netif_tx_start_all_queues(dev); |
1da177e4 LT |
725 | return 0; |
726 | } | |
727 | ||
728 | /* Net device close. */ | |
729 | static int tun_net_close(struct net_device *dev) | |
730 | { | |
c8d68e6b | 731 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
732 | return 0; |
733 | } | |
734 | ||
735 | /* Net device start xmit */ | |
424efe9c | 736 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
737 | { |
738 | struct tun_struct *tun = netdev_priv(dev); | |
c8d68e6b | 739 | int txq = skb->queue_mapping; |
6e914fc7 | 740 | struct tun_file *tfile; |
1da177e4 | 741 | |
6e914fc7 | 742 | rcu_read_lock(); |
c8d68e6b JW |
743 | tfile = rcu_dereference(tun->tfiles[txq]); |
744 | ||
1da177e4 | 745 | /* Drop packet if interface is not attached */ |
c8d68e6b | 746 | if (txq >= tun->numqueues) |
1da177e4 LT |
747 | goto drop; |
748 | ||
9bc88939 TH |
749 | if (tun->numqueues == 1) { |
750 | /* Select queue was not called for the skbuff, so we extract the | |
751 | * RPS hash and save it into the flow_table here. | |
752 | */ | |
753 | __u32 rxhash; | |
754 | ||
755 | rxhash = skb_get_hash(skb); | |
756 | if (rxhash) { | |
757 | struct tun_flow_entry *e; | |
758 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], | |
759 | rxhash); | |
760 | if (e) | |
761 | tun_flow_save_rps_rxhash(e, rxhash); | |
762 | } | |
763 | } | |
764 | ||
6e914fc7 JW |
765 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
766 | ||
c8d68e6b JW |
767 | BUG_ON(!tfile); |
768 | ||
f271b2cc MK |
769 | /* Drop if the filter does not like it. |
770 | * This is a noop if the filter is disabled. | |
771 | * Filter can be enabled only for the TAP devices. */ | |
772 | if (!check_filter(&tun->txflt, skb)) | |
773 | goto drop; | |
774 | ||
54f968d6 JW |
775 | if (tfile->socket.sk->sk_filter && |
776 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
777 | goto drop; |
778 | ||
36fe8c09 | 779 | /* Limit the number of packets queued by dividing txq length with the |
c8d68e6b JW |
780 | * number of queues. |
781 | */ | |
54f968d6 | 782 | if (skb_queue_len(&tfile->socket.sk->sk_receive_queue) |
5d097109 MT |
783 | >= dev->tx_queue_len / tun->numqueues) |
784 | goto drop; | |
1da177e4 | 785 | |
7bf66305 JW |
786 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
787 | goto drop; | |
788 | ||
eda29772 RC |
789 | if (skb->sk) { |
790 | sock_tx_timestamp(skb->sk, &skb_shinfo(skb)->tx_flags); | |
791 | sw_tx_timestamp(skb); | |
792 | } | |
793 | ||
0110d6f2 | 794 | /* Orphan the skb - required as we might hang on to it |
7bf66305 JW |
795 | * for indefinite time. |
796 | */ | |
0110d6f2 MT |
797 | skb_orphan(skb); |
798 | ||
f8af75f3 ED |
799 | nf_reset(skb); |
800 | ||
f271b2cc | 801 | /* Enqueue packet */ |
54f968d6 | 802 | skb_queue_tail(&tfile->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
803 | |
804 | /* Notify and wake up reader process */ | |
54f968d6 JW |
805 | if (tfile->flags & TUN_FASYNC) |
806 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
807 | wake_up_interruptible_poll(&tfile->wq.wait, POLLIN | | |
05c2828c | 808 | POLLRDNORM | POLLRDBAND); |
6e914fc7 JW |
809 | |
810 | rcu_read_unlock(); | |
6ed10654 | 811 | return NETDEV_TX_OK; |
1da177e4 LT |
812 | |
813 | drop: | |
09f75cd7 | 814 | dev->stats.tx_dropped++; |
149d36f7 | 815 | skb_tx_error(skb); |
1da177e4 | 816 | kfree_skb(skb); |
6e914fc7 | 817 | rcu_read_unlock(); |
6ed10654 | 818 | return NETDEV_TX_OK; |
1da177e4 LT |
819 | } |
820 | ||
f271b2cc | 821 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 822 | { |
f271b2cc MK |
823 | /* |
824 | * This callback is supposed to deal with mc filter in | |
825 | * _rx_ path and has nothing to do with the _tx_ path. | |
826 | * In rx path we always accept everything userspace gives us. | |
827 | */ | |
1da177e4 LT |
828 | } |
829 | ||
4885a504 ES |
830 | #define MIN_MTU 68 |
831 | #define MAX_MTU 65535 | |
832 | ||
833 | static int | |
834 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
835 | { | |
836 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
837 | return -EINVAL; | |
838 | dev->mtu = new_mtu; | |
839 | return 0; | |
840 | } | |
841 | ||
c8f44aff MM |
842 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
843 | netdev_features_t features) | |
88255375 MM |
844 | { |
845 | struct tun_struct *tun = netdev_priv(dev); | |
846 | ||
847 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
848 | } | |
bebd097a NH |
849 | #ifdef CONFIG_NET_POLL_CONTROLLER |
850 | static void tun_poll_controller(struct net_device *dev) | |
851 | { | |
852 | /* | |
853 | * Tun only receives frames when: | |
854 | * 1) the char device endpoint gets data from user space | |
855 | * 2) the tun socket gets a sendmsg call from user space | |
92d4ea6e | 856 | * Since both of those are synchronous operations, we are guaranteed |
bebd097a | 857 | * never to have pending data when we poll for it |
92d4ea6e | 858 | * so there is nothing to do here but return. |
bebd097a NH |
859 | * We need this though so netpoll recognizes us as an interface that |
860 | * supports polling, which enables bridge devices in virt setups to | |
861 | * still use netconsole | |
862 | */ | |
863 | return; | |
864 | } | |
865 | #endif | |
758e43b7 | 866 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 867 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
868 | .ndo_open = tun_net_open, |
869 | .ndo_stop = tun_net_close, | |
00829823 | 870 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 871 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 872 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 873 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
874 | #ifdef CONFIG_NET_POLL_CONTROLLER |
875 | .ndo_poll_controller = tun_poll_controller, | |
876 | #endif | |
758e43b7 SH |
877 | }; |
878 | ||
879 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 880 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
881 | .ndo_open = tun_net_open, |
882 | .ndo_stop = tun_net_close, | |
00829823 | 883 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 884 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 885 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 886 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
887 | .ndo_set_mac_address = eth_mac_addr, |
888 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 889 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
890 | #ifdef CONFIG_NET_POLL_CONTROLLER |
891 | .ndo_poll_controller = tun_poll_controller, | |
892 | #endif | |
758e43b7 SH |
893 | }; |
894 | ||
944a1376 | 895 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
896 | { |
897 | int i; | |
898 | ||
96442e42 JW |
899 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
900 | INIT_HLIST_HEAD(&tun->flows[i]); | |
901 | ||
902 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
903 | setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); | |
904 | mod_timer(&tun->flow_gc_timer, | |
905 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
906 | } |
907 | ||
908 | static void tun_flow_uninit(struct tun_struct *tun) | |
909 | { | |
910 | del_timer_sync(&tun->flow_gc_timer); | |
911 | tun_flow_flush(tun); | |
96442e42 JW |
912 | } |
913 | ||
1da177e4 LT |
914 | /* Initialize net device. */ |
915 | static void tun_net_init(struct net_device *dev) | |
916 | { | |
917 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 918 | |
1da177e4 LT |
919 | switch (tun->flags & TUN_TYPE_MASK) { |
920 | case TUN_TUN_DEV: | |
758e43b7 SH |
921 | dev->netdev_ops = &tun_netdev_ops; |
922 | ||
1da177e4 LT |
923 | /* Point-to-Point TUN Device */ |
924 | dev->hard_header_len = 0; | |
925 | dev->addr_len = 0; | |
926 | dev->mtu = 1500; | |
927 | ||
928 | /* Zero header length */ | |
6aa20a22 | 929 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
930 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
931 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
932 | break; | |
933 | ||
934 | case TUN_TAP_DEV: | |
7a0a9608 | 935 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 936 | /* Ethernet TAP Device */ |
1da177e4 | 937 | ether_setup(dev); |
550fd08c | 938 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 939 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 940 | |
f2cedb63 | 941 | eth_hw_addr_random(dev); |
36226a8d | 942 | |
1da177e4 LT |
943 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
944 | break; | |
945 | } | |
946 | } | |
947 | ||
948 | /* Character device part */ | |
949 | ||
950 | /* Poll */ | |
c8d68e6b | 951 | static unsigned int tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 952 | { |
b2430de3 EB |
953 | struct tun_file *tfile = file->private_data; |
954 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 955 | struct sock *sk; |
33dccbb0 | 956 | unsigned int mask = 0; |
1da177e4 LT |
957 | |
958 | if (!tun) | |
eac9e902 | 959 | return POLLERR; |
1da177e4 | 960 | |
54f968d6 | 961 | sk = tfile->socket.sk; |
3c8a9c63 | 962 | |
6b8a66ee | 963 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 964 | |
54f968d6 | 965 | poll_wait(file, &tfile->wq.wait, wait); |
6aa20a22 | 966 | |
89f56d1e | 967 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
968 | mask |= POLLIN | POLLRDNORM; |
969 | ||
33dccbb0 HX |
970 | if (sock_writeable(sk) || |
971 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
972 | sock_writeable(sk))) | |
973 | mask |= POLLOUT | POLLWRNORM; | |
974 | ||
c70f1829 EB |
975 | if (tun->dev->reg_state != NETREG_REGISTERED) |
976 | mask = POLLERR; | |
977 | ||
631ab46b | 978 | tun_put(tun); |
1da177e4 LT |
979 | return mask; |
980 | } | |
981 | ||
f42157cb RR |
982 | /* prepad is the amount to reserve at front. len is length after that. |
983 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 984 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 985 | size_t prepad, size_t len, |
986 | size_t linear, int noblock) | |
f42157cb | 987 | { |
54f968d6 | 988 | struct sock *sk = tfile->socket.sk; |
f42157cb | 989 | struct sk_buff *skb; |
33dccbb0 | 990 | int err; |
f42157cb RR |
991 | |
992 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 993 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 994 | linear = len; |
f42157cb | 995 | |
33dccbb0 | 996 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
28d64271 | 997 | &err, 0); |
f42157cb | 998 | if (!skb) |
33dccbb0 | 999 | return ERR_PTR(err); |
f42157cb RR |
1000 | |
1001 | skb_reserve(skb, prepad); | |
1002 | skb_put(skb, linear); | |
33dccbb0 HX |
1003 | skb->data_len = len - linear; |
1004 | skb->len += len - linear; | |
f42157cb RR |
1005 | |
1006 | return skb; | |
1007 | } | |
1008 | ||
1da177e4 | 1009 | /* Get packet from user space buffer */ |
54f968d6 JW |
1010 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
1011 | void *msg_control, const struct iovec *iv, | |
1012 | size_t total_len, size_t count, int noblock) | |
1da177e4 | 1013 | { |
09640e63 | 1014 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1015 | struct sk_buff *skb; |
3dd5c330 | 1016 | size_t len = total_len, align = NET_SKB_PAD, linear; |
f43798c2 | 1017 | struct virtio_net_hdr gso = { 0 }; |
96f8d9ec | 1018 | int good_linear; |
6f26c9a7 | 1019 | int offset = 0; |
0690899b MT |
1020 | int copylen; |
1021 | bool zerocopy = false; | |
1022 | int err; | |
49974420 | 1023 | u32 rxhash; |
1da177e4 LT |
1024 | |
1025 | if (!(tun->flags & TUN_NO_PI)) { | |
15718ea0 | 1026 | if (len < sizeof(pi)) |
1da177e4 | 1027 | return -EINVAL; |
15718ea0 | 1028 | len -= sizeof(pi); |
1da177e4 | 1029 | |
6f26c9a7 | 1030 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 1031 | return -EFAULT; |
6f26c9a7 | 1032 | offset += sizeof(pi); |
1da177e4 LT |
1033 | } |
1034 | ||
f43798c2 | 1035 | if (tun->flags & TUN_VNET_HDR) { |
15718ea0 | 1036 | if (len < tun->vnet_hdr_sz) |
f43798c2 | 1037 | return -EINVAL; |
15718ea0 | 1038 | len -= tun->vnet_hdr_sz; |
f43798c2 | 1039 | |
6f26c9a7 | 1040 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
1041 | return -EFAULT; |
1042 | ||
4909122f HX |
1043 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
1044 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
1045 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
1046 | ||
f43798c2 RR |
1047 | if (gso.hdr_len > len) |
1048 | return -EINVAL; | |
d9d52b51 | 1049 | offset += tun->vnet_hdr_sz; |
f43798c2 RR |
1050 | } |
1051 | ||
e01bf1c8 | 1052 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
a504b86e | 1053 | align += NET_IP_ALIGN; |
0eca93bc HX |
1054 | if (unlikely(len < ETH_HLEN || |
1055 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
1056 | return -EINVAL; |
1057 | } | |
6aa20a22 | 1058 | |
96f8d9ec JW |
1059 | good_linear = SKB_MAX_HEAD(align); |
1060 | ||
88529176 JW |
1061 | if (msg_control) { |
1062 | /* There are 256 bytes to be copied in skb, so there is | |
1063 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1064 | * The rest of the buffer is mapped from userspace. |
1065 | */ | |
88529176 | 1066 | copylen = gso.hdr_len ? gso.hdr_len : GOODCOPY_LEN; |
96f8d9ec JW |
1067 | if (copylen > good_linear) |
1068 | copylen = good_linear; | |
3dd5c330 | 1069 | linear = copylen; |
88529176 JW |
1070 | if (iov_pages(iv, offset + copylen, count) <= MAX_SKB_FRAGS) |
1071 | zerocopy = true; | |
1072 | } | |
1073 | ||
1074 | if (!zerocopy) { | |
0690899b | 1075 | copylen = len; |
96f8d9ec JW |
1076 | if (gso.hdr_len > good_linear) |
1077 | linear = good_linear; | |
1078 | else | |
1079 | linear = gso.hdr_len; | |
3dd5c330 | 1080 | } |
0690899b | 1081 | |
3dd5c330 | 1082 | skb = tun_alloc_skb(tfile, align, copylen, linear, noblock); |
33dccbb0 HX |
1083 | if (IS_ERR(skb)) { |
1084 | if (PTR_ERR(skb) != -EAGAIN) | |
1085 | tun->dev->stats.rx_dropped++; | |
1086 | return PTR_ERR(skb); | |
1da177e4 LT |
1087 | } |
1088 | ||
0690899b MT |
1089 | if (zerocopy) |
1090 | err = zerocopy_sg_from_iovec(skb, iv, offset, count); | |
88529176 | 1091 | else { |
0690899b | 1092 | err = skb_copy_datagram_from_iovec(skb, 0, iv, offset, len); |
88529176 JW |
1093 | if (!err && msg_control) { |
1094 | struct ubuf_info *uarg = msg_control; | |
1095 | uarg->callback(uarg, false); | |
1096 | } | |
1097 | } | |
0690899b MT |
1098 | |
1099 | if (err) { | |
09f75cd7 | 1100 | tun->dev->stats.rx_dropped++; |
8f22757e | 1101 | kfree_skb(skb); |
1da177e4 | 1102 | return -EFAULT; |
8f22757e | 1103 | } |
1da177e4 | 1104 | |
f43798c2 RR |
1105 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
1106 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
1107 | gso.csum_offset)) { | |
1108 | tun->dev->stats.rx_frame_errors++; | |
1109 | kfree_skb(skb); | |
1110 | return -EINVAL; | |
1111 | } | |
88255375 | 1112 | } |
f43798c2 | 1113 | |
1da177e4 LT |
1114 | switch (tun->flags & TUN_TYPE_MASK) { |
1115 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
1116 | if (tun->flags & TUN_NO_PI) { |
1117 | switch (skb->data[0] & 0xf0) { | |
1118 | case 0x40: | |
1119 | pi.proto = htons(ETH_P_IP); | |
1120 | break; | |
1121 | case 0x60: | |
1122 | pi.proto = htons(ETH_P_IPV6); | |
1123 | break; | |
1124 | default: | |
1125 | tun->dev->stats.rx_dropped++; | |
1126 | kfree_skb(skb); | |
1127 | return -EINVAL; | |
1128 | } | |
1129 | } | |
1130 | ||
459a98ed | 1131 | skb_reset_mac_header(skb); |
1da177e4 | 1132 | skb->protocol = pi.proto; |
4c13eb66 | 1133 | skb->dev = tun->dev; |
1da177e4 LT |
1134 | break; |
1135 | case TUN_TAP_DEV: | |
1136 | skb->protocol = eth_type_trans(skb, tun->dev); | |
1137 | break; | |
6403eab1 | 1138 | } |
1da177e4 | 1139 | |
f43798c2 RR |
1140 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
1141 | pr_debug("GSO!\n"); | |
1142 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1143 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
c9af6db4 | 1144 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
f43798c2 RR |
1145 | break; |
1146 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
c9af6db4 | 1147 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
f43798c2 | 1148 | break; |
e36aa25a | 1149 | case VIRTIO_NET_HDR_GSO_UDP: |
c9af6db4 | 1150 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
e36aa25a | 1151 | break; |
f43798c2 RR |
1152 | default: |
1153 | tun->dev->stats.rx_frame_errors++; | |
1154 | kfree_skb(skb); | |
1155 | return -EINVAL; | |
1156 | } | |
1157 | ||
1158 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
c9af6db4 | 1159 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
f43798c2 RR |
1160 | |
1161 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
1162 | if (skb_shinfo(skb)->gso_size == 0) { | |
1163 | tun->dev->stats.rx_frame_errors++; | |
1164 | kfree_skb(skb); | |
1165 | return -EINVAL; | |
1166 | } | |
1167 | ||
1168 | /* Header must be checked, and gso_segs computed. */ | |
1169 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1170 | skb_shinfo(skb)->gso_segs = 0; | |
1171 | } | |
6aa20a22 | 1172 | |
0690899b MT |
1173 | /* copy skb_ubuf_info for callback when skb has no error */ |
1174 | if (zerocopy) { | |
1175 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1176 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
c9af6db4 | 1177 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
0690899b MT |
1178 | } |
1179 | ||
76fe4581 | 1180 | skb_reset_network_header(skb); |
40893fd0 | 1181 | skb_probe_transport_header(skb, 0); |
38502af7 | 1182 | |
3958afa1 | 1183 | rxhash = skb_get_hash(skb); |
1da177e4 | 1184 | netif_rx_ni(skb); |
6aa20a22 | 1185 | |
09f75cd7 JG |
1186 | tun->dev->stats.rx_packets++; |
1187 | tun->dev->stats.rx_bytes += len; | |
1da177e4 | 1188 | |
9e85722d | 1189 | tun_flow_update(tun, rxhash, tfile); |
0690899b | 1190 | return total_len; |
6aa20a22 | 1191 | } |
1da177e4 | 1192 | |
ee0b3e67 BP |
1193 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
1194 | unsigned long count, loff_t pos) | |
1da177e4 | 1195 | { |
33dccbb0 | 1196 | struct file *file = iocb->ki_filp; |
ab46d779 | 1197 | struct tun_struct *tun = tun_get(file); |
54f968d6 | 1198 | struct tun_file *tfile = file->private_data; |
631ab46b | 1199 | ssize_t result; |
1da177e4 LT |
1200 | |
1201 | if (!tun) | |
1202 | return -EBADFD; | |
1203 | ||
6b8a66ee | 1204 | tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count); |
1da177e4 | 1205 | |
54f968d6 JW |
1206 | result = tun_get_user(tun, tfile, NULL, iv, iov_length(iv, count), |
1207 | count, file->f_flags & O_NONBLOCK); | |
631ab46b EB |
1208 | |
1209 | tun_put(tun); | |
1210 | return result; | |
1da177e4 LT |
1211 | } |
1212 | ||
1da177e4 | 1213 | /* Put packet to the user space buffer */ |
6f7c156c | 1214 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 1215 | struct tun_file *tfile, |
6f7c156c | 1216 | struct sk_buff *skb, |
1217 | const struct iovec *iv, int len) | |
1da177e4 LT |
1218 | { |
1219 | struct tun_pi pi = { 0, skb->protocol }; | |
1220 | ssize_t total = 0; | |
e6fd07c8 | 1221 | int vlan_offset = 0, copied; |
1da177e4 LT |
1222 | |
1223 | if (!(tun->flags & TUN_NO_PI)) { | |
1224 | if ((len -= sizeof(pi)) < 0) | |
1225 | return -EINVAL; | |
1226 | ||
1227 | if (len < skb->len) { | |
1228 | /* Packet will be striped */ | |
1229 | pi.flags |= TUN_PKT_STRIP; | |
1230 | } | |
6aa20a22 | 1231 | |
43b39dcd | 1232 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
1233 | return -EFAULT; |
1234 | total += sizeof(pi); | |
6aa20a22 | 1235 | } |
1da177e4 | 1236 | |
f43798c2 RR |
1237 | if (tun->flags & TUN_VNET_HDR) { |
1238 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
d9d52b51 | 1239 | if ((len -= tun->vnet_hdr_sz) < 0) |
f43798c2 RR |
1240 | return -EINVAL; |
1241 | ||
1242 | if (skb_is_gso(skb)) { | |
1243 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1244 | ||
1245 | /* This is a hint as to how much should be linear. */ | |
1246 | gso.hdr_len = skb_headlen(skb); | |
1247 | gso.gso_size = sinfo->gso_size; | |
1248 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1249 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1250 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1251 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e36aa25a SS |
1252 | else if (sinfo->gso_type & SKB_GSO_UDP) |
1253 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
ef3db4a5 | 1254 | else { |
6b8a66ee | 1255 | pr_err("unexpected GSO type: " |
ef3db4a5 MT |
1256 | "0x%x, gso_size %d, hdr_len %d\n", |
1257 | sinfo->gso_type, gso.gso_size, | |
1258 | gso.hdr_len); | |
1259 | print_hex_dump(KERN_ERR, "tun: ", | |
1260 | DUMP_PREFIX_NONE, | |
1261 | 16, 1, skb->head, | |
1262 | min((int)gso.hdr_len, 64), true); | |
1263 | WARN_ON_ONCE(1); | |
1264 | return -EINVAL; | |
1265 | } | |
f43798c2 RR |
1266 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
1267 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1268 | } else | |
1269 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1270 | ||
1271 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1272 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 1273 | gso.csum_start = skb_checksum_start_offset(skb); |
f43798c2 | 1274 | gso.csum_offset = skb->csum_offset; |
10a8d94a JW |
1275 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
1276 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
f43798c2 RR |
1277 | } /* else everything is zero */ |
1278 | ||
43b39dcd MT |
1279 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
1280 | sizeof(gso)))) | |
f43798c2 | 1281 | return -EFAULT; |
d9d52b51 | 1282 | total += tun->vnet_hdr_sz; |
f43798c2 RR |
1283 | } |
1284 | ||
e6fd07c8 JW |
1285 | copied = total; |
1286 | total += skb->len; | |
6680ec68 JW |
1287 | if (!vlan_tx_tag_present(skb)) { |
1288 | len = min_t(int, skb->len, len); | |
1289 | } else { | |
1290 | int copy, ret; | |
1291 | struct { | |
1292 | __be16 h_vlan_proto; | |
1293 | __be16 h_vlan_TCI; | |
1294 | } veth; | |
1295 | ||
1296 | veth.h_vlan_proto = skb->vlan_proto; | |
1297 | veth.h_vlan_TCI = htons(vlan_tx_tag_get(skb)); | |
1298 | ||
1299 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
1300 | len = min_t(int, skb->len + VLAN_HLEN, len); | |
e6fd07c8 | 1301 | total += VLAN_HLEN; |
6680ec68 JW |
1302 | |
1303 | copy = min_t(int, vlan_offset, len); | |
e6fd07c8 | 1304 | ret = skb_copy_datagram_const_iovec(skb, 0, iv, copied, copy); |
6680ec68 | 1305 | len -= copy; |
e6fd07c8 | 1306 | copied += copy; |
6680ec68 JW |
1307 | if (ret || !len) |
1308 | goto done; | |
1309 | ||
1310 | copy = min_t(int, sizeof(veth), len); | |
e6fd07c8 | 1311 | ret = memcpy_toiovecend(iv, (void *)&veth, copied, copy); |
6680ec68 | 1312 | len -= copy; |
e6fd07c8 | 1313 | copied += copy; |
6680ec68 JW |
1314 | if (ret || !len) |
1315 | goto done; | |
1316 | } | |
1da177e4 | 1317 | |
e6fd07c8 | 1318 | skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len); |
1da177e4 | 1319 | |
6680ec68 | 1320 | done: |
09f75cd7 JG |
1321 | tun->dev->stats.tx_packets++; |
1322 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
1323 | |
1324 | return total; | |
1325 | } | |
1326 | ||
54f968d6 | 1327 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
f96eb74c | 1328 | const struct iovec *iv, ssize_t len, int noblock) |
1da177e4 | 1329 | { |
1da177e4 LT |
1330 | DECLARE_WAITQUEUE(wait, current); |
1331 | struct sk_buff *skb; | |
05c2828c | 1332 | ssize_t ret = 0; |
1da177e4 | 1333 | |
3872baf6 | 1334 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 1335 | |
61a5ff15 | 1336 | if (unlikely(!noblock)) |
54f968d6 | 1337 | add_wait_queue(&tfile->wq.wait, &wait); |
1da177e4 | 1338 | while (len) { |
5c0c52c9 MT |
1339 | if (unlikely(!noblock)) |
1340 | current->state = TASK_INTERRUPTIBLE; | |
1da177e4 LT |
1341 | |
1342 | /* Read frames from the queue */ | |
54f968d6 | 1343 | if (!(skb = skb_dequeue(&tfile->socket.sk->sk_receive_queue))) { |
05c2828c | 1344 | if (noblock) { |
1da177e4 LT |
1345 | ret = -EAGAIN; |
1346 | break; | |
1347 | } | |
1348 | if (signal_pending(current)) { | |
1349 | ret = -ERESTARTSYS; | |
1350 | break; | |
1351 | } | |
c70f1829 EB |
1352 | if (tun->dev->reg_state != NETREG_REGISTERED) { |
1353 | ret = -EIO; | |
1354 | break; | |
1355 | } | |
1da177e4 LT |
1356 | |
1357 | /* Nothing to read, let's sleep */ | |
1358 | schedule(); | |
1359 | continue; | |
1360 | } | |
1da177e4 | 1361 | |
54f968d6 | 1362 | ret = tun_put_user(tun, tfile, skb, iv, len); |
f271b2cc MK |
1363 | kfree_skb(skb); |
1364 | break; | |
1da177e4 LT |
1365 | } |
1366 | ||
5c0c52c9 MT |
1367 | if (unlikely(!noblock)) { |
1368 | current->state = TASK_RUNNING; | |
54f968d6 | 1369 | remove_wait_queue(&tfile->wq.wait, &wait); |
5c0c52c9 | 1370 | } |
1da177e4 | 1371 | |
05c2828c MT |
1372 | return ret; |
1373 | } | |
1374 | ||
1375 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
1376 | unsigned long count, loff_t pos) | |
1377 | { | |
1378 | struct file *file = iocb->ki_filp; | |
1379 | struct tun_file *tfile = file->private_data; | |
1380 | struct tun_struct *tun = __tun_get(tfile); | |
1381 | ssize_t len, ret; | |
1382 | ||
1383 | if (!tun) | |
1384 | return -EBADFD; | |
1385 | len = iov_length(iv, count); | |
1386 | if (len < 0) { | |
1387 | ret = -EINVAL; | |
1388 | goto out; | |
1389 | } | |
1390 | ||
f96eb74c | 1391 | ret = tun_do_read(tun, tfile, iv, len, |
54f968d6 | 1392 | file->f_flags & O_NONBLOCK); |
42404c09 | 1393 | ret = min_t(ssize_t, ret, len); |
d0b7da8a ZYW |
1394 | if (ret > 0) |
1395 | iocb->ki_pos = ret; | |
631ab46b EB |
1396 | out: |
1397 | tun_put(tun); | |
1da177e4 LT |
1398 | return ret; |
1399 | } | |
1400 | ||
96442e42 JW |
1401 | static void tun_free_netdev(struct net_device *dev) |
1402 | { | |
1403 | struct tun_struct *tun = netdev_priv(dev); | |
1404 | ||
4008e97f | 1405 | BUG_ON(!(list_empty(&tun->disabled))); |
96442e42 | 1406 | tun_flow_uninit(tun); |
5dbbaf2d | 1407 | security_tun_dev_free_security(tun->security); |
96442e42 JW |
1408 | free_netdev(dev); |
1409 | } | |
1410 | ||
1da177e4 LT |
1411 | static void tun_setup(struct net_device *dev) |
1412 | { | |
1413 | struct tun_struct *tun = netdev_priv(dev); | |
1414 | ||
0625c883 EB |
1415 | tun->owner = INVALID_UID; |
1416 | tun->group = INVALID_GID; | |
1da177e4 | 1417 | |
1da177e4 | 1418 | dev->ethtool_ops = &tun_ethtool_ops; |
96442e42 | 1419 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
1420 | } |
1421 | ||
f019a7a5 EB |
1422 | /* Trivial set of netlink ops to allow deleting tun or tap |
1423 | * device with netlink. | |
1424 | */ | |
1425 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1426 | { | |
1427 | return -EINVAL; | |
1428 | } | |
1429 | ||
1430 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1431 | .kind = DRV_NAME, | |
1432 | .priv_size = sizeof(struct tun_struct), | |
1433 | .setup = tun_setup, | |
1434 | .validate = tun_validate, | |
1435 | }; | |
1436 | ||
33dccbb0 HX |
1437 | static void tun_sock_write_space(struct sock *sk) |
1438 | { | |
54f968d6 | 1439 | struct tun_file *tfile; |
43815482 | 1440 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1441 | |
1442 | if (!sock_writeable(sk)) | |
1443 | return; | |
1444 | ||
33dccbb0 HX |
1445 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
1446 | return; | |
1447 | ||
43815482 ED |
1448 | wqueue = sk_sleep(sk); |
1449 | if (wqueue && waitqueue_active(wqueue)) | |
1450 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1451 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1452 | |
54f968d6 JW |
1453 | tfile = container_of(sk, struct tun_file, sk); |
1454 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
1455 | } |
1456 | ||
05c2828c MT |
1457 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
1458 | struct msghdr *m, size_t total_len) | |
1459 | { | |
54f968d6 JW |
1460 | int ret; |
1461 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1462 | struct tun_struct *tun = __tun_get(tfile); | |
1463 | ||
1464 | if (!tun) | |
1465 | return -EBADFD; | |
54f968d6 JW |
1466 | ret = tun_get_user(tun, tfile, m->msg_control, m->msg_iov, total_len, |
1467 | m->msg_iovlen, m->msg_flags & MSG_DONTWAIT); | |
1468 | tun_put(tun); | |
1469 | return ret; | |
05c2828c MT |
1470 | } |
1471 | ||
1472 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1473 | struct msghdr *m, size_t total_len, | |
1474 | int flags) | |
1475 | { | |
54f968d6 JW |
1476 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
1477 | struct tun_struct *tun = __tun_get(tfile); | |
05c2828c | 1478 | int ret; |
54f968d6 JW |
1479 | |
1480 | if (!tun) | |
1481 | return -EBADFD; | |
1482 | ||
eda29772 | 1483 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
3811ae76 G |
1484 | ret = -EINVAL; |
1485 | goto out; | |
1486 | } | |
eda29772 RC |
1487 | if (flags & MSG_ERRQUEUE) { |
1488 | ret = sock_recv_errqueue(sock->sk, m, total_len, | |
1489 | SOL_PACKET, TUN_TX_TIMESTAMP); | |
1490 | goto out; | |
1491 | } | |
f96eb74c | 1492 | ret = tun_do_read(tun, tfile, m->msg_iov, total_len, |
05c2828c | 1493 | flags & MSG_DONTWAIT); |
42404c09 DM |
1494 | if (ret > total_len) { |
1495 | m->msg_flags |= MSG_TRUNC; | |
1496 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1497 | } | |
3811ae76 | 1498 | out: |
54f968d6 | 1499 | tun_put(tun); |
05c2828c MT |
1500 | return ret; |
1501 | } | |
1502 | ||
1ab5ecb9 SK |
1503 | static int tun_release(struct socket *sock) |
1504 | { | |
1505 | if (sock->sk) | |
1506 | sock_put(sock->sk); | |
1507 | return 0; | |
1508 | } | |
1509 | ||
05c2828c MT |
1510 | /* Ops structure to mimic raw sockets with tun */ |
1511 | static const struct proto_ops tun_socket_ops = { | |
1512 | .sendmsg = tun_sendmsg, | |
1513 | .recvmsg = tun_recvmsg, | |
1ab5ecb9 | 1514 | .release = tun_release, |
05c2828c MT |
1515 | }; |
1516 | ||
33dccbb0 HX |
1517 | static struct proto tun_proto = { |
1518 | .name = "tun", | |
1519 | .owner = THIS_MODULE, | |
54f968d6 | 1520 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 1521 | }; |
f019a7a5 | 1522 | |
980c9e8c DW |
1523 | static int tun_flags(struct tun_struct *tun) |
1524 | { | |
1525 | int flags = 0; | |
1526 | ||
1527 | if (tun->flags & TUN_TUN_DEV) | |
1528 | flags |= IFF_TUN; | |
1529 | else | |
1530 | flags |= IFF_TAP; | |
1531 | ||
1532 | if (tun->flags & TUN_NO_PI) | |
1533 | flags |= IFF_NO_PI; | |
1534 | ||
5d097109 MT |
1535 | /* This flag has no real effect. We track the value for backwards |
1536 | * compatibility. | |
1537 | */ | |
980c9e8c DW |
1538 | if (tun->flags & TUN_ONE_QUEUE) |
1539 | flags |= IFF_ONE_QUEUE; | |
1540 | ||
1541 | if (tun->flags & TUN_VNET_HDR) | |
1542 | flags |= IFF_VNET_HDR; | |
1543 | ||
c8d68e6b JW |
1544 | if (tun->flags & TUN_TAP_MQ) |
1545 | flags |= IFF_MULTI_QUEUE; | |
1546 | ||
274038f8 PE |
1547 | if (tun->flags & TUN_PERSIST) |
1548 | flags |= IFF_PERSIST; | |
1549 | ||
980c9e8c DW |
1550 | return flags; |
1551 | } | |
1552 | ||
1553 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1554 | char *buf) | |
1555 | { | |
1556 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1557 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1558 | } | |
1559 | ||
1560 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1561 | char *buf) | |
1562 | { | |
1563 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1564 | return uid_valid(tun->owner)? |
1565 | sprintf(buf, "%u\n", | |
1566 | from_kuid_munged(current_user_ns(), tun->owner)): | |
1567 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1568 | } |
1569 | ||
1570 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1571 | char *buf) | |
1572 | { | |
1573 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1574 | return gid_valid(tun->group) ? |
1575 | sprintf(buf, "%u\n", | |
1576 | from_kgid_munged(current_user_ns(), tun->group)): | |
1577 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1578 | } |
1579 | ||
1580 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1581 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1582 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1583 | ||
d647a591 | 1584 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
1585 | { |
1586 | struct tun_struct *tun; | |
54f968d6 | 1587 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
1588 | struct net_device *dev; |
1589 | int err; | |
1590 | ||
7c0c3b1a JW |
1591 | if (tfile->detached) |
1592 | return -EINVAL; | |
1593 | ||
74a3e5a7 EB |
1594 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1595 | if (dev) { | |
f85ba780 DW |
1596 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1597 | return -EBUSY; | |
74a3e5a7 EB |
1598 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1599 | tun = netdev_priv(dev); | |
1600 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1601 | tun = netdev_priv(dev); | |
1602 | else | |
1603 | return -EINVAL; | |
1604 | ||
8e6d91ae JW |
1605 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
1606 | !!(tun->flags & TUN_TAP_MQ)) | |
1607 | return -EINVAL; | |
1608 | ||
cde8b15f | 1609 | if (tun_not_capable(tun)) |
2b980dbd | 1610 | return -EPERM; |
5dbbaf2d | 1611 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
1612 | if (err < 0) |
1613 | return err; | |
1614 | ||
849c9b6f | 1615 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER); |
a7385ba2 EB |
1616 | if (err < 0) |
1617 | return err; | |
4008e97f JW |
1618 | |
1619 | if (tun->flags & TUN_TAP_MQ && | |
e8dbad66 JW |
1620 | (tun->numqueues + tun->numdisabled > 1)) { |
1621 | /* One or more queue has already been attached, no need | |
1622 | * to initialize the device again. | |
1623 | */ | |
1624 | return 0; | |
1625 | } | |
6aa20a22 | 1626 | } |
1da177e4 LT |
1627 | else { |
1628 | char *name; | |
1629 | unsigned long flags = 0; | |
edfb6a14 JW |
1630 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
1631 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 1632 | |
c260b772 | 1633 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 1634 | return -EPERM; |
2b980dbd PM |
1635 | err = security_tun_dev_create(); |
1636 | if (err < 0) | |
1637 | return err; | |
ca6bb5d7 | 1638 | |
1da177e4 LT |
1639 | /* Set dev type */ |
1640 | if (ifr->ifr_flags & IFF_TUN) { | |
1641 | /* TUN device */ | |
1642 | flags |= TUN_TUN_DEV; | |
1643 | name = "tun%d"; | |
1644 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1645 | /* TAP device */ | |
1646 | flags |= TUN_TAP_DEV; | |
1647 | name = "tap%d"; | |
6aa20a22 | 1648 | } else |
36989b90 | 1649 | return -EINVAL; |
6aa20a22 | 1650 | |
1da177e4 LT |
1651 | if (*ifr->ifr_name) |
1652 | name = ifr->ifr_name; | |
1653 | ||
c8d68e6b | 1654 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
edfb6a14 JW |
1655 | tun_setup, queues, queues); |
1656 | ||
1da177e4 LT |
1657 | if (!dev) |
1658 | return -ENOMEM; | |
1659 | ||
fc54c658 | 1660 | dev_net_set(dev, net); |
f019a7a5 | 1661 | dev->rtnl_link_ops = &tun_link_ops; |
fb7589a1 | 1662 | dev->ifindex = tfile->ifindex; |
758e43b7 | 1663 | |
1da177e4 LT |
1664 | tun = netdev_priv(dev); |
1665 | tun->dev = dev; | |
1666 | tun->flags = flags; | |
f271b2cc | 1667 | tun->txflt.count = 0; |
d9d52b51 | 1668 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 1669 | |
54f968d6 JW |
1670 | tun->filter_attached = false; |
1671 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
33dccbb0 | 1672 | |
96442e42 JW |
1673 | spin_lock_init(&tun->lock); |
1674 | ||
5dbbaf2d PM |
1675 | err = security_tun_dev_alloc_security(&tun->security); |
1676 | if (err < 0) | |
1677 | goto err_free_dev; | |
2b980dbd | 1678 | |
1da177e4 | 1679 | tun_net_init(dev); |
944a1376 | 1680 | tun_flow_init(tun); |
96442e42 | 1681 | |
88255375 | 1682 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
6680ec68 JW |
1683 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
1684 | NETIF_F_HW_VLAN_STAG_TX; | |
88255375 | 1685 | dev->features = dev->hw_features; |
c0317998 | 1686 | dev->vlan_features = dev->features; |
88255375 | 1687 | |
4008e97f | 1688 | INIT_LIST_HEAD(&tun->disabled); |
849c9b6f | 1689 | err = tun_attach(tun, file, false); |
eb0fb363 | 1690 | if (err < 0) |
662ca437 | 1691 | goto err_free_flow; |
eb0fb363 | 1692 | |
1da177e4 LT |
1693 | err = register_netdevice(tun->dev); |
1694 | if (err < 0) | |
662ca437 | 1695 | goto err_detach; |
9c3fea6a | 1696 | |
980c9e8c DW |
1697 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1698 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1699 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
6b8a66ee | 1700 | pr_err("Failed to create tun sysfs files\n"); |
1da177e4 LT |
1701 | } |
1702 | ||
af668b3c MT |
1703 | netif_carrier_on(tun->dev); |
1704 | ||
6b8a66ee | 1705 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 LT |
1706 | |
1707 | if (ifr->ifr_flags & IFF_NO_PI) | |
1708 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1709 | else |
1710 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 | 1711 | |
5d097109 MT |
1712 | /* This flag has no real effect. We track the value for backwards |
1713 | * compatibility. | |
1714 | */ | |
1da177e4 LT |
1715 | if (ifr->ifr_flags & IFF_ONE_QUEUE) |
1716 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1717 | else |
1718 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1719 | |
f43798c2 RR |
1720 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1721 | tun->flags |= TUN_VNET_HDR; | |
1722 | else | |
1723 | tun->flags &= ~TUN_VNET_HDR; | |
1724 | ||
c8d68e6b JW |
1725 | if (ifr->ifr_flags & IFF_MULTI_QUEUE) |
1726 | tun->flags |= TUN_TAP_MQ; | |
1727 | else | |
1728 | tun->flags &= ~TUN_TAP_MQ; | |
1729 | ||
e35259a9 MK |
1730 | /* Make sure persistent devices do not get stuck in |
1731 | * xoff state. | |
1732 | */ | |
1733 | if (netif_running(tun->dev)) | |
c8d68e6b | 1734 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 1735 | |
1da177e4 LT |
1736 | strcpy(ifr->ifr_name, tun->dev->name); |
1737 | return 0; | |
1738 | ||
662ca437 JW |
1739 | err_detach: |
1740 | tun_detach_all(dev); | |
1741 | err_free_flow: | |
1742 | tun_flow_uninit(tun); | |
1743 | security_tun_dev_free_security(tun->security); | |
1744 | err_free_dev: | |
1da177e4 | 1745 | free_netdev(dev); |
1da177e4 LT |
1746 | return err; |
1747 | } | |
1748 | ||
9ce99cf6 | 1749 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 1750 | struct ifreq *ifr) |
e3b99556 | 1751 | { |
6b8a66ee | 1752 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1753 | |
1754 | strcpy(ifr->ifr_name, tun->dev->name); | |
1755 | ||
980c9e8c | 1756 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 1757 | |
e3b99556 MM |
1758 | } |
1759 | ||
5228ddc9 RR |
1760 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1761 | * privs required. */ | |
88255375 | 1762 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1763 | { |
c8f44aff | 1764 | netdev_features_t features = 0; |
5228ddc9 RR |
1765 | |
1766 | if (arg & TUN_F_CSUM) { | |
88255375 | 1767 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1768 | arg &= ~TUN_F_CSUM; |
1769 | ||
1770 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1771 | if (arg & TUN_F_TSO_ECN) { | |
1772 | features |= NETIF_F_TSO_ECN; | |
1773 | arg &= ~TUN_F_TSO_ECN; | |
1774 | } | |
1775 | if (arg & TUN_F_TSO4) | |
1776 | features |= NETIF_F_TSO; | |
1777 | if (arg & TUN_F_TSO6) | |
1778 | features |= NETIF_F_TSO6; | |
1779 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1780 | } | |
e36aa25a SS |
1781 | |
1782 | if (arg & TUN_F_UFO) { | |
1783 | features |= NETIF_F_UFO; | |
1784 | arg &= ~TUN_F_UFO; | |
1785 | } | |
5228ddc9 RR |
1786 | } |
1787 | ||
1788 | /* This gives the user a way to test for new features in future by | |
1789 | * trying to set them. */ | |
1790 | if (arg) | |
1791 | return -EINVAL; | |
1792 | ||
88255375 MM |
1793 | tun->set_features = features; |
1794 | netdev_update_features(tun->dev); | |
5228ddc9 RR |
1795 | |
1796 | return 0; | |
1797 | } | |
1798 | ||
c8d68e6b JW |
1799 | static void tun_detach_filter(struct tun_struct *tun, int n) |
1800 | { | |
1801 | int i; | |
1802 | struct tun_file *tfile; | |
1803 | ||
1804 | for (i = 0; i < n; i++) { | |
b8deabd3 | 1805 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1806 | sk_detach_filter(tfile->socket.sk); |
1807 | } | |
1808 | ||
1809 | tun->filter_attached = false; | |
1810 | } | |
1811 | ||
1812 | static int tun_attach_filter(struct tun_struct *tun) | |
1813 | { | |
1814 | int i, ret = 0; | |
1815 | struct tun_file *tfile; | |
1816 | ||
1817 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1818 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1819 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
1820 | if (ret) { | |
1821 | tun_detach_filter(tun, i); | |
1822 | return ret; | |
1823 | } | |
1824 | } | |
1825 | ||
1826 | tun->filter_attached = true; | |
1827 | return ret; | |
1828 | } | |
1829 | ||
1830 | static void tun_set_sndbuf(struct tun_struct *tun) | |
1831 | { | |
1832 | struct tun_file *tfile; | |
1833 | int i; | |
1834 | ||
1835 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1836 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1837 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
1838 | } | |
1839 | } | |
1840 | ||
cde8b15f JW |
1841 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
1842 | { | |
1843 | struct tun_file *tfile = file->private_data; | |
1844 | struct tun_struct *tun; | |
cde8b15f JW |
1845 | int ret = 0; |
1846 | ||
1847 | rtnl_lock(); | |
1848 | ||
1849 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 1850 | tun = tfile->detached; |
5dbbaf2d | 1851 | if (!tun) { |
cde8b15f | 1852 | ret = -EINVAL; |
5dbbaf2d PM |
1853 | goto unlock; |
1854 | } | |
1855 | ret = security_tun_dev_attach_queue(tun->security); | |
1856 | if (ret < 0) | |
1857 | goto unlock; | |
849c9b6f | 1858 | ret = tun_attach(tun, file, false); |
4008e97f | 1859 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 1860 | tun = rtnl_dereference(tfile->tun); |
9e85722d | 1861 | if (!tun || !(tun->flags & TUN_TAP_MQ) || tfile->detached) |
4008e97f JW |
1862 | ret = -EINVAL; |
1863 | else | |
1864 | __tun_detach(tfile, false); | |
1865 | } else | |
cde8b15f JW |
1866 | ret = -EINVAL; |
1867 | ||
5dbbaf2d | 1868 | unlock: |
cde8b15f JW |
1869 | rtnl_unlock(); |
1870 | return ret; | |
1871 | } | |
1872 | ||
50857e2a AB |
1873 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1874 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1875 | { |
36b50bab | 1876 | struct tun_file *tfile = file->private_data; |
631ab46b | 1877 | struct tun_struct *tun; |
1da177e4 LT |
1878 | void __user* argp = (void __user*)arg; |
1879 | struct ifreq ifr; | |
0625c883 EB |
1880 | kuid_t owner; |
1881 | kgid_t group; | |
33dccbb0 | 1882 | int sndbuf; |
d9d52b51 | 1883 | int vnet_hdr_sz; |
fb7589a1 | 1884 | unsigned int ifindex; |
f271b2cc | 1885 | int ret; |
1da177e4 | 1886 | |
cde8b15f | 1887 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) { |
50857e2a | 1888 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 1889 | return -EFAULT; |
8bbb1813 | 1890 | } else { |
a117dacd | 1891 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 1892 | } |
631ab46b EB |
1893 | if (cmd == TUNGETFEATURES) { |
1894 | /* Currently this just means: "what IFF flags are valid?". | |
1895 | * This is needed because we never checked for invalid flags on | |
1896 | * TUNSETIFF. */ | |
1897 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
cde8b15f | 1898 | IFF_VNET_HDR | IFF_MULTI_QUEUE, |
631ab46b | 1899 | (unsigned int __user*)argp); |
cde8b15f JW |
1900 | } else if (cmd == TUNSETQUEUE) |
1901 | return tun_set_queue(file, &ifr); | |
631ab46b | 1902 | |
c8d68e6b | 1903 | ret = 0; |
876bfd4d HX |
1904 | rtnl_lock(); |
1905 | ||
36b50bab | 1906 | tun = __tun_get(tfile); |
1da177e4 | 1907 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1908 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1909 | ||
876bfd4d | 1910 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1911 | |
876bfd4d HX |
1912 | if (ret) |
1913 | goto unlock; | |
1da177e4 | 1914 | |
50857e2a | 1915 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1916 | ret = -EFAULT; |
1917 | goto unlock; | |
1da177e4 | 1918 | } |
fb7589a1 PE |
1919 | if (cmd == TUNSETIFINDEX) { |
1920 | ret = -EPERM; | |
1921 | if (tun) | |
1922 | goto unlock; | |
1923 | ||
1924 | ret = -EFAULT; | |
1925 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) | |
1926 | goto unlock; | |
1927 | ||
1928 | ret = 0; | |
1929 | tfile->ifindex = ifindex; | |
1930 | goto unlock; | |
1931 | } | |
1da177e4 | 1932 | |
876bfd4d | 1933 | ret = -EBADFD; |
1da177e4 | 1934 | if (!tun) |
876bfd4d | 1935 | goto unlock; |
1da177e4 | 1936 | |
1e588338 | 1937 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 1938 | |
631ab46b | 1939 | ret = 0; |
1da177e4 | 1940 | switch (cmd) { |
e3b99556 | 1941 | case TUNGETIFF: |
9ce99cf6 | 1942 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1943 | |
3d407a80 PE |
1944 | if (tfile->detached) |
1945 | ifr.ifr_flags |= IFF_DETACH_QUEUE; | |
849c9b6f PE |
1946 | if (!tfile->socket.sk->sk_filter) |
1947 | ifr.ifr_flags |= IFF_NOFILTER; | |
3d407a80 | 1948 | |
50857e2a | 1949 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1950 | ret = -EFAULT; |
e3b99556 MM |
1951 | break; |
1952 | ||
1da177e4 LT |
1953 | case TUNSETNOCSUM: |
1954 | /* Disable/Enable checksum */ | |
1da177e4 | 1955 | |
88255375 MM |
1956 | /* [unimplemented] */ |
1957 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 1958 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
1959 | break; |
1960 | ||
1961 | case TUNSETPERSIST: | |
54f968d6 JW |
1962 | /* Disable/Enable persist mode. Keep an extra reference to the |
1963 | * module to prevent the module being unprobed. | |
1964 | */ | |
dd38bd85 | 1965 | if (arg && !(tun->flags & TUN_PERSIST)) { |
1da177e4 | 1966 | tun->flags |= TUN_PERSIST; |
54f968d6 | 1967 | __module_get(THIS_MODULE); |
dd38bd85 JW |
1968 | } |
1969 | if (!arg && (tun->flags & TUN_PERSIST)) { | |
1da177e4 | 1970 | tun->flags &= ~TUN_PERSIST; |
54f968d6 JW |
1971 | module_put(THIS_MODULE); |
1972 | } | |
1da177e4 | 1973 | |
6b8a66ee JP |
1974 | tun_debug(KERN_INFO, tun, "persist %s\n", |
1975 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
1976 | break; |
1977 | ||
1978 | case TUNSETOWNER: | |
1979 | /* Set owner of the device */ | |
0625c883 EB |
1980 | owner = make_kuid(current_user_ns(), arg); |
1981 | if (!uid_valid(owner)) { | |
1982 | ret = -EINVAL; | |
1983 | break; | |
1984 | } | |
1985 | tun->owner = owner; | |
1e588338 | 1986 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 1987 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
1988 | break; |
1989 | ||
8c644623 GG |
1990 | case TUNSETGROUP: |
1991 | /* Set group of the device */ | |
0625c883 EB |
1992 | group = make_kgid(current_user_ns(), arg); |
1993 | if (!gid_valid(group)) { | |
1994 | ret = -EINVAL; | |
1995 | break; | |
1996 | } | |
1997 | tun->group = group; | |
1e588338 | 1998 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 1999 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
2000 | break; |
2001 | ||
ff4cc3ac MK |
2002 | case TUNSETLINK: |
2003 | /* Only allow setting the type when the interface is down */ | |
2004 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
2005 | tun_debug(KERN_INFO, tun, |
2006 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 2007 | ret = -EBUSY; |
ff4cc3ac MK |
2008 | } else { |
2009 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
2010 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
2011 | tun->dev->type); | |
48abfe05 | 2012 | ret = 0; |
ff4cc3ac | 2013 | } |
631ab46b | 2014 | break; |
ff4cc3ac | 2015 | |
1da177e4 LT |
2016 | #ifdef TUN_DEBUG |
2017 | case TUNSETDEBUG: | |
2018 | tun->debug = arg; | |
2019 | break; | |
2020 | #endif | |
5228ddc9 | 2021 | case TUNSETOFFLOAD: |
88255375 | 2022 | ret = set_offload(tun, arg); |
631ab46b | 2023 | break; |
5228ddc9 | 2024 | |
f271b2cc MK |
2025 | case TUNSETTXFILTER: |
2026 | /* Can be set only for TAPs */ | |
631ab46b | 2027 | ret = -EINVAL; |
f271b2cc | 2028 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 2029 | break; |
c0e5a8c2 | 2030 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 2031 | break; |
1da177e4 LT |
2032 | |
2033 | case SIOCGIFHWADDR: | |
b595076a | 2034 | /* Get hw address */ |
f271b2cc MK |
2035 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
2036 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 2037 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
2038 | ret = -EFAULT; |
2039 | break; | |
1da177e4 LT |
2040 | |
2041 | case SIOCSIFHWADDR: | |
f271b2cc | 2042 | /* Set hw address */ |
6b8a66ee JP |
2043 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
2044 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 2045 | |
40102371 | 2046 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 2047 | break; |
33dccbb0 HX |
2048 | |
2049 | case TUNGETSNDBUF: | |
54f968d6 | 2050 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
2051 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
2052 | ret = -EFAULT; | |
2053 | break; | |
2054 | ||
2055 | case TUNSETSNDBUF: | |
2056 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
2057 | ret = -EFAULT; | |
2058 | break; | |
2059 | } | |
2060 | ||
c8d68e6b JW |
2061 | tun->sndbuf = sndbuf; |
2062 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
2063 | break; |
2064 | ||
d9d52b51 MT |
2065 | case TUNGETVNETHDRSZ: |
2066 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
2067 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
2068 | ret = -EFAULT; | |
2069 | break; | |
2070 | ||
2071 | case TUNSETVNETHDRSZ: | |
2072 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
2073 | ret = -EFAULT; | |
2074 | break; | |
2075 | } | |
2076 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
2077 | ret = -EINVAL; | |
2078 | break; | |
2079 | } | |
2080 | ||
2081 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
2082 | break; | |
2083 | ||
99405162 MT |
2084 | case TUNATTACHFILTER: |
2085 | /* Can be set only for TAPs */ | |
2086 | ret = -EINVAL; | |
2087 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2088 | break; | |
2089 | ret = -EFAULT; | |
54f968d6 | 2090 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
2091 | break; |
2092 | ||
c8d68e6b | 2093 | ret = tun_attach_filter(tun); |
99405162 MT |
2094 | break; |
2095 | ||
2096 | case TUNDETACHFILTER: | |
2097 | /* Can be set only for TAPs */ | |
2098 | ret = -EINVAL; | |
2099 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2100 | break; | |
c8d68e6b JW |
2101 | ret = 0; |
2102 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
2103 | break; |
2104 | ||
76975e9c PE |
2105 | case TUNGETFILTER: |
2106 | ret = -EINVAL; | |
2107 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2108 | break; | |
2109 | ret = -EFAULT; | |
2110 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) | |
2111 | break; | |
2112 | ret = 0; | |
2113 | break; | |
2114 | ||
1da177e4 | 2115 | default: |
631ab46b EB |
2116 | ret = -EINVAL; |
2117 | break; | |
ee289b64 | 2118 | } |
1da177e4 | 2119 | |
876bfd4d HX |
2120 | unlock: |
2121 | rtnl_unlock(); | |
2122 | if (tun) | |
2123 | tun_put(tun); | |
631ab46b | 2124 | return ret; |
1da177e4 LT |
2125 | } |
2126 | ||
50857e2a AB |
2127 | static long tun_chr_ioctl(struct file *file, |
2128 | unsigned int cmd, unsigned long arg) | |
2129 | { | |
2130 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
2131 | } | |
2132 | ||
2133 | #ifdef CONFIG_COMPAT | |
2134 | static long tun_chr_compat_ioctl(struct file *file, | |
2135 | unsigned int cmd, unsigned long arg) | |
2136 | { | |
2137 | switch (cmd) { | |
2138 | case TUNSETIFF: | |
2139 | case TUNGETIFF: | |
2140 | case TUNSETTXFILTER: | |
2141 | case TUNGETSNDBUF: | |
2142 | case TUNSETSNDBUF: | |
2143 | case SIOCGIFHWADDR: | |
2144 | case SIOCSIFHWADDR: | |
2145 | arg = (unsigned long)compat_ptr(arg); | |
2146 | break; | |
2147 | default: | |
2148 | arg = (compat_ulong_t)arg; | |
2149 | break; | |
2150 | } | |
2151 | ||
2152 | /* | |
2153 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
2154 | * the end of that structure. All fields that are used in this | |
2155 | * driver are compatible though, we don't need to convert the | |
2156 | * contents. | |
2157 | */ | |
2158 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
2159 | } | |
2160 | #endif /* CONFIG_COMPAT */ | |
2161 | ||
1da177e4 LT |
2162 | static int tun_chr_fasync(int fd, struct file *file, int on) |
2163 | { | |
54f968d6 | 2164 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2165 | int ret; |
2166 | ||
54f968d6 | 2167 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 2168 | goto out; |
6aa20a22 | 2169 | |
1da177e4 | 2170 | if (on) { |
609d7fa9 | 2171 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 2172 | if (ret) |
9d319522 | 2173 | goto out; |
54f968d6 | 2174 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 2175 | } else |
54f968d6 | 2176 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
2177 | ret = 0; |
2178 | out: | |
9d319522 | 2179 | return ret; |
1da177e4 LT |
2180 | } |
2181 | ||
2182 | static int tun_chr_open(struct inode *inode, struct file * file) | |
2183 | { | |
631ab46b | 2184 | struct tun_file *tfile; |
deed49fb | 2185 | |
6b8a66ee | 2186 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 2187 | |
54f968d6 JW |
2188 | tfile = (struct tun_file *)sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL, |
2189 | &tun_proto); | |
631ab46b EB |
2190 | if (!tfile) |
2191 | return -ENOMEM; | |
6e914fc7 | 2192 | rcu_assign_pointer(tfile->tun, NULL); |
36b50bab | 2193 | tfile->net = get_net(current->nsproxy->net_ns); |
54f968d6 | 2194 | tfile->flags = 0; |
fb7589a1 | 2195 | tfile->ifindex = 0; |
54f968d6 JW |
2196 | |
2197 | rcu_assign_pointer(tfile->socket.wq, &tfile->wq); | |
2198 | init_waitqueue_head(&tfile->wq.wait); | |
2199 | ||
2200 | tfile->socket.file = file; | |
2201 | tfile->socket.ops = &tun_socket_ops; | |
2202 | ||
2203 | sock_init_data(&tfile->socket, &tfile->sk); | |
2204 | sk_change_net(&tfile->sk, tfile->net); | |
2205 | ||
2206 | tfile->sk.sk_write_space = tun_sock_write_space; | |
2207 | tfile->sk.sk_sndbuf = INT_MAX; | |
2208 | ||
631ab46b | 2209 | file->private_data = tfile; |
54f968d6 | 2210 | set_bit(SOCK_EXTERNALLY_ALLOCATED, &tfile->socket.flags); |
4008e97f | 2211 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 2212 | |
19a6afb2 JW |
2213 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
2214 | ||
1da177e4 LT |
2215 | return 0; |
2216 | } | |
2217 | ||
2218 | static int tun_chr_close(struct inode *inode, struct file *file) | |
2219 | { | |
631ab46b | 2220 | struct tun_file *tfile = file->private_data; |
54f968d6 | 2221 | struct net *net = tfile->net; |
1da177e4 | 2222 | |
c8d68e6b | 2223 | tun_detach(tfile, true); |
54f968d6 | 2224 | put_net(net); |
1da177e4 LT |
2225 | |
2226 | return 0; | |
2227 | } | |
2228 | ||
d54b1fdb | 2229 | static const struct file_operations tun_fops = { |
6aa20a22 | 2230 | .owner = THIS_MODULE, |
1da177e4 | 2231 | .llseek = no_llseek, |
ee0b3e67 BP |
2232 | .read = do_sync_read, |
2233 | .aio_read = tun_chr_aio_read, | |
2234 | .write = do_sync_write, | |
2235 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 2236 | .poll = tun_chr_poll, |
50857e2a AB |
2237 | .unlocked_ioctl = tun_chr_ioctl, |
2238 | #ifdef CONFIG_COMPAT | |
2239 | .compat_ioctl = tun_chr_compat_ioctl, | |
2240 | #endif | |
1da177e4 LT |
2241 | .open = tun_chr_open, |
2242 | .release = tun_chr_close, | |
6aa20a22 | 2243 | .fasync = tun_chr_fasync |
1da177e4 LT |
2244 | }; |
2245 | ||
2246 | static struct miscdevice tun_miscdev = { | |
2247 | .minor = TUN_MINOR, | |
2248 | .name = "tun", | |
e454cea2 | 2249 | .nodename = "net/tun", |
1da177e4 | 2250 | .fops = &tun_fops, |
1da177e4 LT |
2251 | }; |
2252 | ||
2253 | /* ethtool interface */ | |
2254 | ||
2255 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
2256 | { | |
2257 | cmd->supported = 0; | |
2258 | cmd->advertising = 0; | |
70739497 | 2259 | ethtool_cmd_speed_set(cmd, SPEED_10); |
1da177e4 LT |
2260 | cmd->duplex = DUPLEX_FULL; |
2261 | cmd->port = PORT_TP; | |
2262 | cmd->phy_address = 0; | |
2263 | cmd->transceiver = XCVR_INTERNAL; | |
2264 | cmd->autoneg = AUTONEG_DISABLE; | |
2265 | cmd->maxtxpkt = 0; | |
2266 | cmd->maxrxpkt = 0; | |
2267 | return 0; | |
2268 | } | |
2269 | ||
2270 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
2271 | { | |
2272 | struct tun_struct *tun = netdev_priv(dev); | |
2273 | ||
33a5ba14 RJ |
2274 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
2275 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
2276 | |
2277 | switch (tun->flags & TUN_TYPE_MASK) { | |
2278 | case TUN_TUN_DEV: | |
33a5ba14 | 2279 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 LT |
2280 | break; |
2281 | case TUN_TAP_DEV: | |
33a5ba14 | 2282 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
2283 | break; |
2284 | } | |
2285 | } | |
2286 | ||
2287 | static u32 tun_get_msglevel(struct net_device *dev) | |
2288 | { | |
2289 | #ifdef TUN_DEBUG | |
2290 | struct tun_struct *tun = netdev_priv(dev); | |
2291 | return tun->debug; | |
2292 | #else | |
2293 | return -EOPNOTSUPP; | |
2294 | #endif | |
2295 | } | |
2296 | ||
2297 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
2298 | { | |
2299 | #ifdef TUN_DEBUG | |
2300 | struct tun_struct *tun = netdev_priv(dev); | |
2301 | tun->debug = value; | |
2302 | #endif | |
2303 | } | |
2304 | ||
7282d491 | 2305 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
2306 | .get_settings = tun_get_settings, |
2307 | .get_drvinfo = tun_get_drvinfo, | |
2308 | .get_msglevel = tun_get_msglevel, | |
2309 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 2310 | .get_link = ethtool_op_get_link, |
eda29772 | 2311 | .get_ts_info = ethtool_op_get_ts_info, |
1da177e4 LT |
2312 | }; |
2313 | ||
79d17604 | 2314 | |
1da177e4 LT |
2315 | static int __init tun_init(void) |
2316 | { | |
2317 | int ret = 0; | |
2318 | ||
6b8a66ee JP |
2319 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
2320 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 2321 | |
f019a7a5 | 2322 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 2323 | if (ret) { |
6b8a66ee | 2324 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 2325 | goto err_linkops; |
79d17604 PE |
2326 | } |
2327 | ||
1da177e4 | 2328 | ret = misc_register(&tun_miscdev); |
79d17604 | 2329 | if (ret) { |
6b8a66ee | 2330 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
2331 | goto err_misc; |
2332 | } | |
f019a7a5 | 2333 | return 0; |
79d17604 | 2334 | err_misc: |
f019a7a5 EB |
2335 | rtnl_link_unregister(&tun_link_ops); |
2336 | err_linkops: | |
1da177e4 LT |
2337 | return ret; |
2338 | } | |
2339 | ||
2340 | static void tun_cleanup(void) | |
2341 | { | |
6aa20a22 | 2342 | misc_deregister(&tun_miscdev); |
f019a7a5 | 2343 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
2344 | } |
2345 | ||
05c2828c MT |
2346 | /* Get an underlying socket object from tun file. Returns error unless file is |
2347 | * attached to a device. The returned object works like a packet socket, it | |
2348 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
2349 | * holding a reference to the file for as long as the socket is in use. */ | |
2350 | struct socket *tun_get_socket(struct file *file) | |
2351 | { | |
6e914fc7 | 2352 | struct tun_file *tfile; |
05c2828c MT |
2353 | if (file->f_op != &tun_fops) |
2354 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
2355 | tfile = file->private_data; |
2356 | if (!tfile) | |
05c2828c | 2357 | return ERR_PTR(-EBADFD); |
54f968d6 | 2358 | return &tfile->socket; |
05c2828c MT |
2359 | } |
2360 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
2361 | ||
1da177e4 LT |
2362 | module_init(tun_init); |
2363 | module_exit(tun_cleanup); | |
2364 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
2365 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
2366 | MODULE_LICENSE("GPL"); | |
2367 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 2368 | MODULE_ALIAS("devname:net/tun"); |