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> |
93e14b6d | 72 | #include <linux/seq_file.h> |
e0b46d0e | 73 | #include <linux/uio.h> |
1da177e4 | 74 | |
1da177e4 LT |
75 | #include <asm/uaccess.h> |
76 | ||
14daa021 RR |
77 | /* Uncomment to enable debugging */ |
78 | /* #define TUN_DEBUG 1 */ | |
79 | ||
1da177e4 LT |
80 | #ifdef TUN_DEBUG |
81 | static int debug; | |
14daa021 | 82 | |
6b8a66ee JP |
83 | #define tun_debug(level, tun, fmt, args...) \ |
84 | do { \ | |
85 | if (tun->debug) \ | |
86 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
87 | } while (0) | |
88 | #define DBG1(level, fmt, args...) \ | |
89 | do { \ | |
90 | if (debug == 2) \ | |
91 | printk(level fmt, ##args); \ | |
92 | } while (0) | |
14daa021 | 93 | #else |
6b8a66ee JP |
94 | #define tun_debug(level, tun, fmt, args...) \ |
95 | do { \ | |
96 | if (0) \ | |
97 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
98 | } while (0) | |
99 | #define DBG1(level, fmt, args...) \ | |
100 | do { \ | |
101 | if (0) \ | |
102 | printk(level fmt, ##args); \ | |
103 | } while (0) | |
14daa021 RR |
104 | #endif |
105 | ||
031f5e03 MT |
106 | /* TUN device flags */ |
107 | ||
108 | /* IFF_ATTACH_QUEUE is never stored in device flags, | |
109 | * overload it to mean fasync when stored there. | |
110 | */ | |
111 | #define TUN_FASYNC IFF_ATTACH_QUEUE | |
1cf8e410 MT |
112 | /* High bits in flags field are unused. */ |
113 | #define TUN_VNET_LE 0x80000000 | |
031f5e03 MT |
114 | |
115 | #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ | |
1cf8e410 | 116 | IFF_MULTI_QUEUE) |
0690899b MT |
117 | #define GOODCOPY_LEN 128 |
118 | ||
f271b2cc MK |
119 | #define FLT_EXACT_COUNT 8 |
120 | struct tap_filter { | |
121 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
122 | u32 mask[2]; /* Mask of the hashed addrs */ | |
123 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
124 | }; | |
125 | ||
baf71c5c PG |
126 | /* MAX_TAP_QUEUES 256 is chosen to allow rx/tx queues to be equal |
127 | * to max number of VCPUs in guest. */ | |
128 | #define MAX_TAP_QUEUES 256 | |
b8732fb7 | 129 | #define MAX_TAP_FLOWS 4096 |
c8d68e6b | 130 | |
96442e42 JW |
131 | #define TUN_FLOW_EXPIRE (3 * HZ) |
132 | ||
54f968d6 | 133 | /* A tun_file connects an open character device to a tuntap netdevice. It |
92d4ea6e | 134 | * also contains all socket related structures (except sock_fprog and tap_filter) |
54f968d6 JW |
135 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
136 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 137 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 138 | * this). |
6e914fc7 JW |
139 | * |
140 | * RCU usage: | |
36fe8c09 | 141 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 142 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 143 | */ |
631ab46b | 144 | struct tun_file { |
54f968d6 JW |
145 | struct sock sk; |
146 | struct socket socket; | |
147 | struct socket_wq wq; | |
6e914fc7 | 148 | struct tun_struct __rcu *tun; |
36b50bab | 149 | struct net *net; |
54f968d6 JW |
150 | struct fasync_struct *fasync; |
151 | /* only used for fasnyc */ | |
152 | unsigned int flags; | |
fb7589a1 PE |
153 | union { |
154 | u16 queue_index; | |
155 | unsigned int ifindex; | |
156 | }; | |
4008e97f JW |
157 | struct list_head next; |
158 | struct tun_struct *detached; | |
631ab46b EB |
159 | }; |
160 | ||
96442e42 JW |
161 | struct tun_flow_entry { |
162 | struct hlist_node hash_link; | |
163 | struct rcu_head rcu; | |
164 | struct tun_struct *tun; | |
165 | ||
166 | u32 rxhash; | |
9bc88939 | 167 | u32 rps_rxhash; |
96442e42 JW |
168 | int queue_index; |
169 | unsigned long updated; | |
170 | }; | |
171 | ||
172 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
173 | ||
54f968d6 | 174 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 175 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
176 | * file were attached to a persist device. |
177 | */ | |
14daa021 | 178 | struct tun_struct { |
c8d68e6b JW |
179 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
180 | unsigned int numqueues; | |
f271b2cc | 181 | unsigned int flags; |
0625c883 EB |
182 | kuid_t owner; |
183 | kgid_t group; | |
14daa021 | 184 | |
14daa021 | 185 | struct net_device *dev; |
c8f44aff | 186 | netdev_features_t set_features; |
88255375 | 187 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
e3e3c423 | 188 | NETIF_F_TSO6|NETIF_F_UFO) |
d9d52b51 MT |
189 | |
190 | int vnet_hdr_sz; | |
54f968d6 JW |
191 | int sndbuf; |
192 | struct tap_filter txflt; | |
193 | struct sock_fprog fprog; | |
194 | /* protected by rtnl lock */ | |
195 | bool filter_attached; | |
14daa021 RR |
196 | #ifdef TUN_DEBUG |
197 | int debug; | |
1da177e4 | 198 | #endif |
96442e42 | 199 | spinlock_t lock; |
96442e42 JW |
200 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
201 | struct timer_list flow_gc_timer; | |
202 | unsigned long ageing_time; | |
4008e97f JW |
203 | unsigned int numdisabled; |
204 | struct list_head disabled; | |
5dbbaf2d | 205 | void *security; |
b8732fb7 | 206 | u32 flow_count; |
14daa021 | 207 | }; |
1da177e4 | 208 | |
56f0dcc5 MT |
209 | static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val) |
210 | { | |
1cf8e410 | 211 | return __virtio16_to_cpu(tun->flags & TUN_VNET_LE, val); |
56f0dcc5 MT |
212 | } |
213 | ||
214 | static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val) | |
215 | { | |
1cf8e410 | 216 | return __cpu_to_virtio16(tun->flags & TUN_VNET_LE, val); |
56f0dcc5 MT |
217 | } |
218 | ||
96442e42 JW |
219 | static inline u32 tun_hashfn(u32 rxhash) |
220 | { | |
221 | return rxhash & 0x3ff; | |
222 | } | |
223 | ||
224 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
225 | { | |
226 | struct tun_flow_entry *e; | |
96442e42 | 227 | |
b67bfe0d | 228 | hlist_for_each_entry_rcu(e, head, hash_link) { |
96442e42 JW |
229 | if (e->rxhash == rxhash) |
230 | return e; | |
231 | } | |
232 | return NULL; | |
233 | } | |
234 | ||
235 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
236 | struct hlist_head *head, | |
237 | u32 rxhash, u16 queue_index) | |
238 | { | |
9fdc6bef ED |
239 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
240 | ||
96442e42 JW |
241 | if (e) { |
242 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
243 | rxhash, queue_index); | |
244 | e->updated = jiffies; | |
245 | e->rxhash = rxhash; | |
9bc88939 | 246 | e->rps_rxhash = 0; |
96442e42 JW |
247 | e->queue_index = queue_index; |
248 | e->tun = tun; | |
249 | hlist_add_head_rcu(&e->hash_link, head); | |
b8732fb7 | 250 | ++tun->flow_count; |
96442e42 JW |
251 | } |
252 | return e; | |
253 | } | |
254 | ||
96442e42 JW |
255 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
256 | { | |
257 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
258 | e->rxhash, e->queue_index); | |
259 | hlist_del_rcu(&e->hash_link); | |
9fdc6bef | 260 | kfree_rcu(e, rcu); |
b8732fb7 | 261 | --tun->flow_count; |
96442e42 JW |
262 | } |
263 | ||
264 | static void tun_flow_flush(struct tun_struct *tun) | |
265 | { | |
266 | int i; | |
267 | ||
268 | spin_lock_bh(&tun->lock); | |
269 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
270 | struct tun_flow_entry *e; | |
b67bfe0d | 271 | struct hlist_node *n; |
96442e42 | 272 | |
b67bfe0d | 273 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
96442e42 JW |
274 | tun_flow_delete(tun, e); |
275 | } | |
276 | spin_unlock_bh(&tun->lock); | |
277 | } | |
278 | ||
279 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
280 | { | |
281 | int i; | |
282 | ||
283 | spin_lock_bh(&tun->lock); | |
284 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
285 | struct tun_flow_entry *e; | |
b67bfe0d | 286 | struct hlist_node *n; |
96442e42 | 287 | |
b67bfe0d | 288 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
289 | if (e->queue_index == queue_index) |
290 | tun_flow_delete(tun, e); | |
291 | } | |
292 | } | |
293 | spin_unlock_bh(&tun->lock); | |
294 | } | |
295 | ||
296 | static void tun_flow_cleanup(unsigned long data) | |
297 | { | |
298 | struct tun_struct *tun = (struct tun_struct *)data; | |
299 | unsigned long delay = tun->ageing_time; | |
300 | unsigned long next_timer = jiffies + delay; | |
301 | unsigned long count = 0; | |
302 | int i; | |
303 | ||
304 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
305 | ||
306 | spin_lock_bh(&tun->lock); | |
307 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
308 | struct tun_flow_entry *e; | |
b67bfe0d | 309 | struct hlist_node *n; |
96442e42 | 310 | |
b67bfe0d | 311 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
312 | unsigned long this_timer; |
313 | count++; | |
314 | this_timer = e->updated + delay; | |
315 | if (time_before_eq(this_timer, jiffies)) | |
316 | tun_flow_delete(tun, e); | |
317 | else if (time_before(this_timer, next_timer)) | |
318 | next_timer = this_timer; | |
319 | } | |
320 | } | |
321 | ||
322 | if (count) | |
323 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
324 | spin_unlock_bh(&tun->lock); | |
325 | } | |
326 | ||
49974420 | 327 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
9e85722d | 328 | struct tun_file *tfile) |
96442e42 JW |
329 | { |
330 | struct hlist_head *head; | |
331 | struct tun_flow_entry *e; | |
332 | unsigned long delay = tun->ageing_time; | |
9e85722d | 333 | u16 queue_index = tfile->queue_index; |
96442e42 JW |
334 | |
335 | if (!rxhash) | |
336 | return; | |
337 | else | |
338 | head = &tun->flows[tun_hashfn(rxhash)]; | |
339 | ||
340 | rcu_read_lock(); | |
341 | ||
9e85722d JW |
342 | /* We may get a very small possibility of OOO during switching, not |
343 | * worth to optimize.*/ | |
344 | if (tun->numqueues == 1 || tfile->detached) | |
96442e42 JW |
345 | goto unlock; |
346 | ||
347 | e = tun_flow_find(head, rxhash); | |
348 | if (likely(e)) { | |
349 | /* TODO: keep queueing to old queue until it's empty? */ | |
350 | e->queue_index = queue_index; | |
351 | e->updated = jiffies; | |
9bc88939 | 352 | sock_rps_record_flow_hash(e->rps_rxhash); |
96442e42 JW |
353 | } else { |
354 | spin_lock_bh(&tun->lock); | |
b8732fb7 JW |
355 | if (!tun_flow_find(head, rxhash) && |
356 | tun->flow_count < MAX_TAP_FLOWS) | |
96442e42 JW |
357 | tun_flow_create(tun, head, rxhash, queue_index); |
358 | ||
359 | if (!timer_pending(&tun->flow_gc_timer)) | |
360 | mod_timer(&tun->flow_gc_timer, | |
361 | round_jiffies_up(jiffies + delay)); | |
362 | spin_unlock_bh(&tun->lock); | |
363 | } | |
364 | ||
365 | unlock: | |
366 | rcu_read_unlock(); | |
367 | } | |
368 | ||
9bc88939 TH |
369 | /** |
370 | * Save the hash received in the stack receive path and update the | |
371 | * flow_hash table accordingly. | |
372 | */ | |
373 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) | |
374 | { | |
567e4b79 | 375 | if (unlikely(e->rps_rxhash != hash)) |
9bc88939 | 376 | e->rps_rxhash = hash; |
9bc88939 TH |
377 | } |
378 | ||
c8d68e6b | 379 | /* We try to identify a flow through its rxhash first. The reason that |
92d4ea6e | 380 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
c8d68e6b JW |
381 | * the rxq based on the txq where the last packet of the flow comes. As |
382 | * the userspace application move between processors, we may get a | |
383 | * different rxq no. here. If we could not get rxhash, then we would | |
384 | * hope the rxq no. may help here. | |
385 | */ | |
f663dd9a | 386 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, |
99932d4f | 387 | void *accel_priv, select_queue_fallback_t fallback) |
c8d68e6b JW |
388 | { |
389 | struct tun_struct *tun = netdev_priv(dev); | |
96442e42 | 390 | struct tun_flow_entry *e; |
c8d68e6b JW |
391 | u32 txq = 0; |
392 | u32 numqueues = 0; | |
393 | ||
394 | rcu_read_lock(); | |
92bb73ea | 395 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 396 | |
3958afa1 | 397 | txq = skb_get_hash(skb); |
c8d68e6b | 398 | if (txq) { |
96442e42 | 399 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
9bc88939 | 400 | if (e) { |
9bc88939 | 401 | tun_flow_save_rps_rxhash(e, txq); |
fbe4d456 | 402 | txq = e->queue_index; |
9bc88939 | 403 | } else |
96442e42 JW |
404 | /* use multiply and shift instead of expensive divide */ |
405 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
406 | } else if (likely(skb_rx_queue_recorded(skb))) { |
407 | txq = skb_get_rx_queue(skb); | |
408 | while (unlikely(txq >= numqueues)) | |
409 | txq -= numqueues; | |
410 | } | |
411 | ||
412 | rcu_read_unlock(); | |
413 | return txq; | |
414 | } | |
415 | ||
cde8b15f JW |
416 | static inline bool tun_not_capable(struct tun_struct *tun) |
417 | { | |
418 | const struct cred *cred = current_cred(); | |
c260b772 | 419 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
420 | |
421 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
422 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 423 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
424 | } |
425 | ||
c8d68e6b JW |
426 | static void tun_set_real_num_queues(struct tun_struct *tun) |
427 | { | |
428 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
429 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
430 | } | |
431 | ||
4008e97f JW |
432 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
433 | { | |
434 | tfile->detached = tun; | |
435 | list_add_tail(&tfile->next, &tun->disabled); | |
436 | ++tun->numdisabled; | |
437 | } | |
438 | ||
d32649d1 | 439 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
440 | { |
441 | struct tun_struct *tun = tfile->detached; | |
442 | ||
443 | tfile->detached = NULL; | |
444 | list_del_init(&tfile->next); | |
445 | --tun->numdisabled; | |
446 | return tun; | |
447 | } | |
448 | ||
4bfb0513 JW |
449 | static void tun_queue_purge(struct tun_file *tfile) |
450 | { | |
451 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
452 | skb_queue_purge(&tfile->sk.sk_error_queue); | |
453 | } | |
454 | ||
c8d68e6b JW |
455 | static void __tun_detach(struct tun_file *tfile, bool clean) |
456 | { | |
457 | struct tun_file *ntfile; | |
458 | struct tun_struct *tun; | |
c8d68e6b | 459 | |
b8deabd3 JW |
460 | tun = rtnl_dereference(tfile->tun); |
461 | ||
9e85722d | 462 | if (tun && !tfile->detached) { |
c8d68e6b JW |
463 | u16 index = tfile->queue_index; |
464 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
465 | |
466 | rcu_assign_pointer(tun->tfiles[index], | |
467 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 468 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
469 | ntfile->queue_index = index; |
470 | ||
471 | --tun->numqueues; | |
9e85722d | 472 | if (clean) { |
c956674b | 473 | RCU_INIT_POINTER(tfile->tun, NULL); |
4008e97f | 474 | sock_put(&tfile->sk); |
9e85722d | 475 | } else |
4008e97f | 476 | tun_disable_queue(tun, tfile); |
c8d68e6b JW |
477 | |
478 | synchronize_net(); | |
96442e42 | 479 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b | 480 | /* Drop read queue */ |
4bfb0513 | 481 | tun_queue_purge(tfile); |
c8d68e6b | 482 | tun_set_real_num_queues(tun); |
dd38bd85 | 483 | } else if (tfile->detached && clean) { |
4008e97f | 484 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
485 | sock_put(&tfile->sk); |
486 | } | |
c8d68e6b JW |
487 | |
488 | if (clean) { | |
af668b3c MT |
489 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
490 | netif_carrier_off(tun->dev); | |
491 | ||
40630b82 | 492 | if (!(tun->flags & IFF_PERSIST) && |
af668b3c | 493 | tun->dev->reg_state == NETREG_REGISTERED) |
4008e97f | 494 | unregister_netdevice(tun->dev); |
af668b3c | 495 | } |
4008e97f | 496 | |
c8d68e6b JW |
497 | BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED, |
498 | &tfile->socket.flags)); | |
499 | sk_release_kernel(&tfile->sk); | |
500 | } | |
501 | } | |
502 | ||
503 | static void tun_detach(struct tun_file *tfile, bool clean) | |
504 | { | |
505 | rtnl_lock(); | |
506 | __tun_detach(tfile, clean); | |
507 | rtnl_unlock(); | |
508 | } | |
509 | ||
510 | static void tun_detach_all(struct net_device *dev) | |
511 | { | |
512 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 513 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
514 | int i, n = tun->numqueues; |
515 | ||
516 | for (i = 0; i < n; i++) { | |
b8deabd3 | 517 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 518 | BUG_ON(!tfile); |
9e641bdc | 519 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 520 | RCU_INIT_POINTER(tfile->tun, NULL); |
c8d68e6b JW |
521 | --tun->numqueues; |
522 | } | |
9e85722d | 523 | list_for_each_entry(tfile, &tun->disabled, next) { |
9e641bdc | 524 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 525 | RCU_INIT_POINTER(tfile->tun, NULL); |
9e85722d | 526 | } |
c8d68e6b JW |
527 | BUG_ON(tun->numqueues != 0); |
528 | ||
529 | synchronize_net(); | |
530 | for (i = 0; i < n; i++) { | |
b8deabd3 | 531 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 532 | /* Drop read queue */ |
4bfb0513 | 533 | tun_queue_purge(tfile); |
c8d68e6b JW |
534 | sock_put(&tfile->sk); |
535 | } | |
4008e97f JW |
536 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
537 | tun_enable_queue(tfile); | |
4bfb0513 | 538 | tun_queue_purge(tfile); |
4008e97f JW |
539 | sock_put(&tfile->sk); |
540 | } | |
541 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 | 542 | |
40630b82 | 543 | if (tun->flags & IFF_PERSIST) |
dd38bd85 | 544 | module_put(THIS_MODULE); |
c8d68e6b JW |
545 | } |
546 | ||
849c9b6f | 547 | static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filter) |
a7385ba2 | 548 | { |
631ab46b | 549 | struct tun_file *tfile = file->private_data; |
38231b7a | 550 | int err; |
a7385ba2 | 551 | |
5dbbaf2d PM |
552 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
553 | if (err < 0) | |
554 | goto out; | |
555 | ||
38231b7a | 556 | err = -EINVAL; |
9e85722d | 557 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
558 | goto out; |
559 | ||
560 | err = -EBUSY; | |
40630b82 | 561 | if (!(tun->flags & IFF_MULTI_QUEUE) && tun->numqueues == 1) |
c8d68e6b JW |
562 | goto out; |
563 | ||
564 | err = -E2BIG; | |
4008e97f JW |
565 | if (!tfile->detached && |
566 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
567 | goto out; |
568 | ||
569 | err = 0; | |
54f968d6 | 570 | |
92d4ea6e | 571 | /* Re-attach the filter to persist device */ |
849c9b6f | 572 | if (!skip_filter && (tun->filter_attached == true)) { |
54f968d6 JW |
573 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
574 | if (!err) | |
575 | goto out; | |
576 | } | |
c8d68e6b | 577 | tfile->queue_index = tun->numqueues; |
6e914fc7 | 578 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 579 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 580 | tun->numqueues++; |
a7385ba2 | 581 | |
4008e97f JW |
582 | if (tfile->detached) |
583 | tun_enable_queue(tfile); | |
584 | else | |
585 | sock_hold(&tfile->sk); | |
586 | ||
c8d68e6b | 587 | tun_set_real_num_queues(tun); |
a7385ba2 | 588 | |
c8d68e6b JW |
589 | /* device is allowed to go away first, so no need to hold extra |
590 | * refcnt. | |
591 | */ | |
592 | ||
593 | out: | |
594 | return err; | |
631ab46b EB |
595 | } |
596 | ||
597 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
598 | { | |
6e914fc7 | 599 | struct tun_struct *tun; |
c70f1829 | 600 | |
6e914fc7 JW |
601 | rcu_read_lock(); |
602 | tun = rcu_dereference(tfile->tun); | |
603 | if (tun) | |
604 | dev_hold(tun->dev); | |
605 | rcu_read_unlock(); | |
c70f1829 EB |
606 | |
607 | return tun; | |
631ab46b EB |
608 | } |
609 | ||
610 | static struct tun_struct *tun_get(struct file *file) | |
611 | { | |
612 | return __tun_get(file->private_data); | |
613 | } | |
614 | ||
615 | static void tun_put(struct tun_struct *tun) | |
616 | { | |
6e914fc7 | 617 | dev_put(tun->dev); |
631ab46b EB |
618 | } |
619 | ||
6b8a66ee | 620 | /* TAP filtering */ |
f271b2cc MK |
621 | static void addr_hash_set(u32 *mask, const u8 *addr) |
622 | { | |
623 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
624 | mask[n >> 5] |= (1 << (n & 31)); | |
625 | } | |
626 | ||
627 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
628 | { | |
629 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
630 | return mask[n >> 5] & (1 << (n & 31)); | |
631 | } | |
632 | ||
633 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
634 | { | |
635 | struct { u8 u[ETH_ALEN]; } *addr; | |
636 | struct tun_filter uf; | |
637 | int err, alen, n, nexact; | |
638 | ||
639 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
640 | return -EFAULT; | |
641 | ||
642 | if (!uf.count) { | |
643 | /* Disabled */ | |
644 | filter->count = 0; | |
645 | return 0; | |
646 | } | |
647 | ||
648 | alen = ETH_ALEN * uf.count; | |
649 | addr = kmalloc(alen, GFP_KERNEL); | |
650 | if (!addr) | |
651 | return -ENOMEM; | |
652 | ||
653 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
654 | err = -EFAULT; | |
655 | goto done; | |
656 | } | |
657 | ||
658 | /* The filter is updated without holding any locks. Which is | |
659 | * perfectly safe. We disable it first and in the worst | |
660 | * case we'll accept a few undesired packets. */ | |
661 | filter->count = 0; | |
662 | wmb(); | |
663 | ||
664 | /* Use first set of addresses as an exact filter */ | |
665 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
666 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
667 | ||
668 | nexact = n; | |
669 | ||
cfbf84fc AW |
670 | /* Remaining multicast addresses are hashed, |
671 | * unicast will leave the filter disabled. */ | |
f271b2cc | 672 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
673 | for (; n < uf.count; n++) { |
674 | if (!is_multicast_ether_addr(addr[n].u)) { | |
675 | err = 0; /* no filter */ | |
676 | goto done; | |
677 | } | |
f271b2cc | 678 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 679 | } |
f271b2cc MK |
680 | |
681 | /* For ALLMULTI just set the mask to all ones. | |
682 | * This overrides the mask populated above. */ | |
683 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
684 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
685 | ||
686 | /* Now enable the filter */ | |
687 | wmb(); | |
688 | filter->count = nexact; | |
689 | ||
690 | /* Return the number of exact filters */ | |
691 | err = nexact; | |
692 | ||
693 | done: | |
694 | kfree(addr); | |
695 | return err; | |
696 | } | |
697 | ||
698 | /* Returns: 0 - drop, !=0 - accept */ | |
699 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
700 | { | |
701 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
702 | * at this point. */ | |
703 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
704 | int i; | |
705 | ||
706 | /* Exact match */ | |
707 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 708 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
709 | return 1; |
710 | ||
711 | /* Inexact match (multicast only) */ | |
712 | if (is_multicast_ether_addr(eh->h_dest)) | |
713 | return addr_hash_test(filter->mask, eh->h_dest); | |
714 | ||
715 | return 0; | |
716 | } | |
717 | ||
718 | /* | |
719 | * Checks whether the packet is accepted or not. | |
720 | * Returns: 0 - drop, !=0 - accept | |
721 | */ | |
722 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
723 | { | |
724 | if (!filter->count) | |
725 | return 1; | |
726 | ||
727 | return run_filter(filter, skb); | |
728 | } | |
729 | ||
1da177e4 LT |
730 | /* Network device part of the driver */ |
731 | ||
7282d491 | 732 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 733 | |
c70f1829 EB |
734 | /* Net device detach from fd. */ |
735 | static void tun_net_uninit(struct net_device *dev) | |
736 | { | |
c8d68e6b | 737 | tun_detach_all(dev); |
c70f1829 EB |
738 | } |
739 | ||
1da177e4 LT |
740 | /* Net device open. */ |
741 | static int tun_net_open(struct net_device *dev) | |
742 | { | |
c8d68e6b | 743 | netif_tx_start_all_queues(dev); |
1da177e4 LT |
744 | return 0; |
745 | } | |
746 | ||
747 | /* Net device close. */ | |
748 | static int tun_net_close(struct net_device *dev) | |
749 | { | |
c8d68e6b | 750 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
751 | return 0; |
752 | } | |
753 | ||
754 | /* Net device start xmit */ | |
424efe9c | 755 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
756 | { |
757 | struct tun_struct *tun = netdev_priv(dev); | |
c8d68e6b | 758 | int txq = skb->queue_mapping; |
6e914fc7 | 759 | struct tun_file *tfile; |
fa35864e | 760 | u32 numqueues = 0; |
1da177e4 | 761 | |
6e914fc7 | 762 | rcu_read_lock(); |
c8d68e6b | 763 | tfile = rcu_dereference(tun->tfiles[txq]); |
fa35864e | 764 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 765 | |
1da177e4 | 766 | /* Drop packet if interface is not attached */ |
fa35864e | 767 | if (txq >= numqueues) |
1da177e4 LT |
768 | goto drop; |
769 | ||
fa35864e | 770 | if (numqueues == 1) { |
9bc88939 TH |
771 | /* Select queue was not called for the skbuff, so we extract the |
772 | * RPS hash and save it into the flow_table here. | |
773 | */ | |
774 | __u32 rxhash; | |
775 | ||
776 | rxhash = skb_get_hash(skb); | |
777 | if (rxhash) { | |
778 | struct tun_flow_entry *e; | |
779 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], | |
780 | rxhash); | |
781 | if (e) | |
782 | tun_flow_save_rps_rxhash(e, rxhash); | |
783 | } | |
784 | } | |
785 | ||
6e914fc7 JW |
786 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
787 | ||
c8d68e6b JW |
788 | BUG_ON(!tfile); |
789 | ||
f271b2cc MK |
790 | /* Drop if the filter does not like it. |
791 | * This is a noop if the filter is disabled. | |
792 | * Filter can be enabled only for the TAP devices. */ | |
793 | if (!check_filter(&tun->txflt, skb)) | |
794 | goto drop; | |
795 | ||
54f968d6 JW |
796 | if (tfile->socket.sk->sk_filter && |
797 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
798 | goto drop; |
799 | ||
36fe8c09 | 800 | /* Limit the number of packets queued by dividing txq length with the |
c8d68e6b JW |
801 | * number of queues. |
802 | */ | |
fa35864e DC |
803 | if (skb_queue_len(&tfile->socket.sk->sk_receive_queue) * numqueues |
804 | >= dev->tx_queue_len) | |
5d097109 | 805 | goto drop; |
1da177e4 | 806 | |
7bf66305 JW |
807 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
808 | goto drop; | |
809 | ||
eda29772 RC |
810 | if (skb->sk) { |
811 | sock_tx_timestamp(skb->sk, &skb_shinfo(skb)->tx_flags); | |
812 | sw_tx_timestamp(skb); | |
813 | } | |
814 | ||
0110d6f2 | 815 | /* Orphan the skb - required as we might hang on to it |
7bf66305 JW |
816 | * for indefinite time. |
817 | */ | |
0110d6f2 MT |
818 | skb_orphan(skb); |
819 | ||
f8af75f3 ED |
820 | nf_reset(skb); |
821 | ||
f271b2cc | 822 | /* Enqueue packet */ |
54f968d6 | 823 | skb_queue_tail(&tfile->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
824 | |
825 | /* Notify and wake up reader process */ | |
54f968d6 JW |
826 | if (tfile->flags & TUN_FASYNC) |
827 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
9e641bdc | 828 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
6e914fc7 JW |
829 | |
830 | rcu_read_unlock(); | |
6ed10654 | 831 | return NETDEV_TX_OK; |
1da177e4 LT |
832 | |
833 | drop: | |
09f75cd7 | 834 | dev->stats.tx_dropped++; |
149d36f7 | 835 | skb_tx_error(skb); |
1da177e4 | 836 | kfree_skb(skb); |
6e914fc7 | 837 | rcu_read_unlock(); |
baeababb | 838 | return NET_XMIT_DROP; |
1da177e4 LT |
839 | } |
840 | ||
f271b2cc | 841 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 842 | { |
f271b2cc MK |
843 | /* |
844 | * This callback is supposed to deal with mc filter in | |
845 | * _rx_ path and has nothing to do with the _tx_ path. | |
846 | * In rx path we always accept everything userspace gives us. | |
847 | */ | |
1da177e4 LT |
848 | } |
849 | ||
4885a504 ES |
850 | #define MIN_MTU 68 |
851 | #define MAX_MTU 65535 | |
852 | ||
853 | static int | |
854 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
855 | { | |
856 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
857 | return -EINVAL; | |
858 | dev->mtu = new_mtu; | |
859 | return 0; | |
860 | } | |
861 | ||
c8f44aff MM |
862 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
863 | netdev_features_t features) | |
88255375 MM |
864 | { |
865 | struct tun_struct *tun = netdev_priv(dev); | |
866 | ||
867 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
868 | } | |
bebd097a NH |
869 | #ifdef CONFIG_NET_POLL_CONTROLLER |
870 | static void tun_poll_controller(struct net_device *dev) | |
871 | { | |
872 | /* | |
873 | * Tun only receives frames when: | |
874 | * 1) the char device endpoint gets data from user space | |
875 | * 2) the tun socket gets a sendmsg call from user space | |
92d4ea6e | 876 | * Since both of those are synchronous operations, we are guaranteed |
bebd097a | 877 | * never to have pending data when we poll for it |
92d4ea6e | 878 | * so there is nothing to do here but return. |
bebd097a NH |
879 | * We need this though so netpoll recognizes us as an interface that |
880 | * supports polling, which enables bridge devices in virt setups to | |
881 | * still use netconsole | |
882 | */ | |
883 | return; | |
884 | } | |
885 | #endif | |
758e43b7 | 886 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 887 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
888 | .ndo_open = tun_net_open, |
889 | .ndo_stop = tun_net_close, | |
00829823 | 890 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 891 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 892 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 893 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
894 | #ifdef CONFIG_NET_POLL_CONTROLLER |
895 | .ndo_poll_controller = tun_poll_controller, | |
896 | #endif | |
758e43b7 SH |
897 | }; |
898 | ||
899 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 900 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
901 | .ndo_open = tun_net_open, |
902 | .ndo_stop = tun_net_close, | |
00829823 | 903 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 904 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 905 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 906 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
907 | .ndo_set_mac_address = eth_mac_addr, |
908 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 909 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
910 | #ifdef CONFIG_NET_POLL_CONTROLLER |
911 | .ndo_poll_controller = tun_poll_controller, | |
912 | #endif | |
758e43b7 SH |
913 | }; |
914 | ||
944a1376 | 915 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
916 | { |
917 | int i; | |
918 | ||
96442e42 JW |
919 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
920 | INIT_HLIST_HEAD(&tun->flows[i]); | |
921 | ||
922 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
923 | setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); | |
924 | mod_timer(&tun->flow_gc_timer, | |
925 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
926 | } |
927 | ||
928 | static void tun_flow_uninit(struct tun_struct *tun) | |
929 | { | |
930 | del_timer_sync(&tun->flow_gc_timer); | |
931 | tun_flow_flush(tun); | |
96442e42 JW |
932 | } |
933 | ||
1da177e4 LT |
934 | /* Initialize net device. */ |
935 | static void tun_net_init(struct net_device *dev) | |
936 | { | |
937 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 938 | |
1da177e4 | 939 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 | 940 | case IFF_TUN: |
758e43b7 SH |
941 | dev->netdev_ops = &tun_netdev_ops; |
942 | ||
1da177e4 LT |
943 | /* Point-to-Point TUN Device */ |
944 | dev->hard_header_len = 0; | |
945 | dev->addr_len = 0; | |
946 | dev->mtu = 1500; | |
947 | ||
948 | /* Zero header length */ | |
6aa20a22 | 949 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
950 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
951 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
952 | break; | |
953 | ||
40630b82 | 954 | case IFF_TAP: |
7a0a9608 | 955 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 956 | /* Ethernet TAP Device */ |
1da177e4 | 957 | ether_setup(dev); |
550fd08c | 958 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 959 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 960 | |
f2cedb63 | 961 | eth_hw_addr_random(dev); |
36226a8d | 962 | |
1da177e4 LT |
963 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
964 | break; | |
965 | } | |
966 | } | |
967 | ||
968 | /* Character device part */ | |
969 | ||
970 | /* Poll */ | |
c8d68e6b | 971 | static unsigned int tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 972 | { |
b2430de3 EB |
973 | struct tun_file *tfile = file->private_data; |
974 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 975 | struct sock *sk; |
33dccbb0 | 976 | unsigned int mask = 0; |
1da177e4 LT |
977 | |
978 | if (!tun) | |
eac9e902 | 979 | return POLLERR; |
1da177e4 | 980 | |
54f968d6 | 981 | sk = tfile->socket.sk; |
3c8a9c63 | 982 | |
6b8a66ee | 983 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 984 | |
9e641bdc | 985 | poll_wait(file, sk_sleep(sk), wait); |
6aa20a22 | 986 | |
89f56d1e | 987 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
988 | mask |= POLLIN | POLLRDNORM; |
989 | ||
33dccbb0 HX |
990 | if (sock_writeable(sk) || |
991 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
992 | sock_writeable(sk))) | |
993 | mask |= POLLOUT | POLLWRNORM; | |
994 | ||
c70f1829 EB |
995 | if (tun->dev->reg_state != NETREG_REGISTERED) |
996 | mask = POLLERR; | |
997 | ||
631ab46b | 998 | tun_put(tun); |
1da177e4 LT |
999 | return mask; |
1000 | } | |
1001 | ||
f42157cb RR |
1002 | /* prepad is the amount to reserve at front. len is length after that. |
1003 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 1004 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 1005 | size_t prepad, size_t len, |
1006 | size_t linear, int noblock) | |
f42157cb | 1007 | { |
54f968d6 | 1008 | struct sock *sk = tfile->socket.sk; |
f42157cb | 1009 | struct sk_buff *skb; |
33dccbb0 | 1010 | int err; |
f42157cb RR |
1011 | |
1012 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 1013 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 1014 | linear = len; |
f42157cb | 1015 | |
33dccbb0 | 1016 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
28d64271 | 1017 | &err, 0); |
f42157cb | 1018 | if (!skb) |
33dccbb0 | 1019 | return ERR_PTR(err); |
f42157cb RR |
1020 | |
1021 | skb_reserve(skb, prepad); | |
1022 | skb_put(skb, linear); | |
33dccbb0 HX |
1023 | skb->data_len = len - linear; |
1024 | skb->len += len - linear; | |
f42157cb RR |
1025 | |
1026 | return skb; | |
1027 | } | |
1028 | ||
1da177e4 | 1029 | /* Get packet from user space buffer */ |
54f968d6 | 1030 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
f5ff53b4 AV |
1031 | void *msg_control, struct iov_iter *from, |
1032 | int noblock) | |
1da177e4 | 1033 | { |
09640e63 | 1034 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1035 | struct sk_buff *skb; |
f5ff53b4 | 1036 | size_t total_len = iov_iter_count(from); |
3dd5c330 | 1037 | size_t len = total_len, align = NET_SKB_PAD, linear; |
f43798c2 | 1038 | struct virtio_net_hdr gso = { 0 }; |
96f8d9ec | 1039 | int good_linear; |
0690899b MT |
1040 | int copylen; |
1041 | bool zerocopy = false; | |
1042 | int err; | |
49974420 | 1043 | u32 rxhash; |
f5ff53b4 | 1044 | ssize_t n; |
1da177e4 | 1045 | |
40630b82 | 1046 | if (!(tun->flags & IFF_NO_PI)) { |
15718ea0 | 1047 | if (len < sizeof(pi)) |
1da177e4 | 1048 | return -EINVAL; |
15718ea0 | 1049 | len -= sizeof(pi); |
1da177e4 | 1050 | |
f5ff53b4 AV |
1051 | n = copy_from_iter(&pi, sizeof(pi), from); |
1052 | if (n != sizeof(pi)) | |
1da177e4 LT |
1053 | return -EFAULT; |
1054 | } | |
1055 | ||
40630b82 | 1056 | if (tun->flags & IFF_VNET_HDR) { |
15718ea0 | 1057 | if (len < tun->vnet_hdr_sz) |
f43798c2 | 1058 | return -EINVAL; |
15718ea0 | 1059 | len -= tun->vnet_hdr_sz; |
f43798c2 | 1060 | |
f5ff53b4 AV |
1061 | n = copy_from_iter(&gso, sizeof(gso), from); |
1062 | if (n != sizeof(gso)) | |
f43798c2 RR |
1063 | return -EFAULT; |
1064 | ||
4909122f | 1065 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
56f0dcc5 MT |
1066 | tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len)) |
1067 | gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2); | |
4909122f | 1068 | |
56f0dcc5 | 1069 | if (tun16_to_cpu(tun, gso.hdr_len) > len) |
f43798c2 | 1070 | return -EINVAL; |
d8febb77 | 1071 | iov_iter_advance(from, tun->vnet_hdr_sz - sizeof(gso)); |
f43798c2 RR |
1072 | } |
1073 | ||
40630b82 | 1074 | if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) { |
a504b86e | 1075 | align += NET_IP_ALIGN; |
0eca93bc | 1076 | if (unlikely(len < ETH_HLEN || |
56f0dcc5 | 1077 | (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN))) |
e01bf1c8 RR |
1078 | return -EINVAL; |
1079 | } | |
6aa20a22 | 1080 | |
96f8d9ec JW |
1081 | good_linear = SKB_MAX_HEAD(align); |
1082 | ||
88529176 | 1083 | if (msg_control) { |
f5ff53b4 AV |
1084 | struct iov_iter i = *from; |
1085 | ||
88529176 JW |
1086 | /* There are 256 bytes to be copied in skb, so there is |
1087 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1088 | * The rest of the buffer is mapped from userspace. |
1089 | */ | |
56f0dcc5 | 1090 | copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN; |
96f8d9ec JW |
1091 | if (copylen > good_linear) |
1092 | copylen = good_linear; | |
3dd5c330 | 1093 | linear = copylen; |
f5ff53b4 AV |
1094 | iov_iter_advance(&i, copylen); |
1095 | if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) | |
88529176 JW |
1096 | zerocopy = true; |
1097 | } | |
1098 | ||
1099 | if (!zerocopy) { | |
0690899b | 1100 | copylen = len; |
56f0dcc5 | 1101 | if (tun16_to_cpu(tun, gso.hdr_len) > good_linear) |
96f8d9ec JW |
1102 | linear = good_linear; |
1103 | else | |
56f0dcc5 | 1104 | linear = tun16_to_cpu(tun, gso.hdr_len); |
3dd5c330 | 1105 | } |
0690899b | 1106 | |
3dd5c330 | 1107 | skb = tun_alloc_skb(tfile, align, copylen, linear, noblock); |
33dccbb0 HX |
1108 | if (IS_ERR(skb)) { |
1109 | if (PTR_ERR(skb) != -EAGAIN) | |
1110 | tun->dev->stats.rx_dropped++; | |
1111 | return PTR_ERR(skb); | |
1da177e4 LT |
1112 | } |
1113 | ||
0690899b | 1114 | if (zerocopy) |
f5ff53b4 | 1115 | err = zerocopy_sg_from_iter(skb, from); |
88529176 | 1116 | else { |
f5ff53b4 | 1117 | err = skb_copy_datagram_from_iter(skb, 0, from, len); |
88529176 JW |
1118 | if (!err && msg_control) { |
1119 | struct ubuf_info *uarg = msg_control; | |
1120 | uarg->callback(uarg, false); | |
1121 | } | |
1122 | } | |
0690899b MT |
1123 | |
1124 | if (err) { | |
09f75cd7 | 1125 | tun->dev->stats.rx_dropped++; |
8f22757e | 1126 | kfree_skb(skb); |
1da177e4 | 1127 | return -EFAULT; |
8f22757e | 1128 | } |
1da177e4 | 1129 | |
f43798c2 | 1130 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
56f0dcc5 MT |
1131 | if (!skb_partial_csum_set(skb, tun16_to_cpu(tun, gso.csum_start), |
1132 | tun16_to_cpu(tun, gso.csum_offset))) { | |
f43798c2 RR |
1133 | tun->dev->stats.rx_frame_errors++; |
1134 | kfree_skb(skb); | |
1135 | return -EINVAL; | |
1136 | } | |
88255375 | 1137 | } |
f43798c2 | 1138 | |
1da177e4 | 1139 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 MT |
1140 | case IFF_TUN: |
1141 | if (tun->flags & IFF_NO_PI) { | |
f09f7ee2 AWC |
1142 | switch (skb->data[0] & 0xf0) { |
1143 | case 0x40: | |
1144 | pi.proto = htons(ETH_P_IP); | |
1145 | break; | |
1146 | case 0x60: | |
1147 | pi.proto = htons(ETH_P_IPV6); | |
1148 | break; | |
1149 | default: | |
1150 | tun->dev->stats.rx_dropped++; | |
1151 | kfree_skb(skb); | |
1152 | return -EINVAL; | |
1153 | } | |
1154 | } | |
1155 | ||
459a98ed | 1156 | skb_reset_mac_header(skb); |
1da177e4 | 1157 | skb->protocol = pi.proto; |
4c13eb66 | 1158 | skb->dev = tun->dev; |
1da177e4 | 1159 | break; |
40630b82 | 1160 | case IFF_TAP: |
1da177e4 LT |
1161 | skb->protocol = eth_type_trans(skb, tun->dev); |
1162 | break; | |
6403eab1 | 1163 | } |
1da177e4 | 1164 | |
f43798c2 RR |
1165 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
1166 | pr_debug("GSO!\n"); | |
1167 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1168 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
c9af6db4 | 1169 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
f43798c2 RR |
1170 | break; |
1171 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
c9af6db4 | 1172 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
f43798c2 | 1173 | break; |
e36aa25a | 1174 | case VIRTIO_NET_HDR_GSO_UDP: |
c9af6db4 | 1175 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
e36aa25a | 1176 | break; |
f43798c2 RR |
1177 | default: |
1178 | tun->dev->stats.rx_frame_errors++; | |
1179 | kfree_skb(skb); | |
1180 | return -EINVAL; | |
1181 | } | |
1182 | ||
1183 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
c9af6db4 | 1184 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
f43798c2 | 1185 | |
56f0dcc5 | 1186 | skb_shinfo(skb)->gso_size = tun16_to_cpu(tun, gso.gso_size); |
f43798c2 RR |
1187 | if (skb_shinfo(skb)->gso_size == 0) { |
1188 | tun->dev->stats.rx_frame_errors++; | |
1189 | kfree_skb(skb); | |
1190 | return -EINVAL; | |
1191 | } | |
1192 | ||
1193 | /* Header must be checked, and gso_segs computed. */ | |
1194 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1195 | skb_shinfo(skb)->gso_segs = 0; | |
1196 | } | |
6aa20a22 | 1197 | |
0690899b MT |
1198 | /* copy skb_ubuf_info for callback when skb has no error */ |
1199 | if (zerocopy) { | |
1200 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1201 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
c9af6db4 | 1202 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
0690899b MT |
1203 | } |
1204 | ||
72f65107 | 1205 | skb_reset_network_header(skb); |
40893fd0 | 1206 | skb_probe_transport_header(skb, 0); |
38502af7 | 1207 | |
3958afa1 | 1208 | rxhash = skb_get_hash(skb); |
1da177e4 | 1209 | netif_rx_ni(skb); |
6aa20a22 | 1210 | |
09f75cd7 JG |
1211 | tun->dev->stats.rx_packets++; |
1212 | tun->dev->stats.rx_bytes += len; | |
1da177e4 | 1213 | |
9e85722d | 1214 | tun_flow_update(tun, rxhash, tfile); |
0690899b | 1215 | return total_len; |
6aa20a22 | 1216 | } |
1da177e4 | 1217 | |
f5ff53b4 | 1218 | static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 | 1219 | { |
33dccbb0 | 1220 | struct file *file = iocb->ki_filp; |
ab46d779 | 1221 | struct tun_struct *tun = tun_get(file); |
54f968d6 | 1222 | struct tun_file *tfile = file->private_data; |
631ab46b | 1223 | ssize_t result; |
1da177e4 LT |
1224 | |
1225 | if (!tun) | |
1226 | return -EBADFD; | |
1227 | ||
f5ff53b4 | 1228 | result = tun_get_user(tun, tfile, NULL, from, file->f_flags & O_NONBLOCK); |
631ab46b EB |
1229 | |
1230 | tun_put(tun); | |
1231 | return result; | |
1da177e4 LT |
1232 | } |
1233 | ||
1da177e4 | 1234 | /* Put packet to the user space buffer */ |
6f7c156c | 1235 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 1236 | struct tun_file *tfile, |
6f7c156c | 1237 | struct sk_buff *skb, |
e0b46d0e | 1238 | struct iov_iter *iter) |
1da177e4 LT |
1239 | { |
1240 | struct tun_pi pi = { 0, skb->protocol }; | |
e0b46d0e | 1241 | ssize_t total; |
8c847d25 | 1242 | int vlan_offset = 0; |
a8f9bfdf | 1243 | int vlan_hlen = 0; |
2eb783c4 | 1244 | int vnet_hdr_sz = 0; |
a8f9bfdf | 1245 | |
df8a39de | 1246 | if (skb_vlan_tag_present(skb)) |
a8f9bfdf | 1247 | vlan_hlen = VLAN_HLEN; |
1da177e4 | 1248 | |
40630b82 | 1249 | if (tun->flags & IFF_VNET_HDR) |
2eb783c4 | 1250 | vnet_hdr_sz = tun->vnet_hdr_sz; |
1da177e4 | 1251 | |
e0b46d0e HX |
1252 | total = skb->len + vlan_hlen + vnet_hdr_sz; |
1253 | ||
40630b82 | 1254 | if (!(tun->flags & IFF_NO_PI)) { |
e0b46d0e | 1255 | if (iov_iter_count(iter) < sizeof(pi)) |
1da177e4 LT |
1256 | return -EINVAL; |
1257 | ||
e0b46d0e HX |
1258 | total += sizeof(pi); |
1259 | if (iov_iter_count(iter) < total) { | |
1da177e4 LT |
1260 | /* Packet will be striped */ |
1261 | pi.flags |= TUN_PKT_STRIP; | |
1262 | } | |
6aa20a22 | 1263 | |
e0b46d0e | 1264 | if (copy_to_iter(&pi, sizeof(pi), iter) != sizeof(pi)) |
1da177e4 | 1265 | return -EFAULT; |
6aa20a22 | 1266 | } |
1da177e4 | 1267 | |
2eb783c4 | 1268 | if (vnet_hdr_sz) { |
f43798c2 | 1269 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ |
e0b46d0e | 1270 | if (iov_iter_count(iter) < vnet_hdr_sz) |
f43798c2 RR |
1271 | return -EINVAL; |
1272 | ||
1273 | if (skb_is_gso(skb)) { | |
1274 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1275 | ||
1276 | /* This is a hint as to how much should be linear. */ | |
56f0dcc5 MT |
1277 | gso.hdr_len = cpu_to_tun16(tun, skb_headlen(skb)); |
1278 | gso.gso_size = cpu_to_tun16(tun, sinfo->gso_size); | |
f43798c2 RR |
1279 | if (sinfo->gso_type & SKB_GSO_TCPV4) |
1280 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1281 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1282 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e3e3c423 VY |
1283 | else if (sinfo->gso_type & SKB_GSO_UDP) |
1284 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
ef3db4a5 | 1285 | else { |
6b8a66ee | 1286 | pr_err("unexpected GSO type: " |
ef3db4a5 | 1287 | "0x%x, gso_size %d, hdr_len %d\n", |
56f0dcc5 MT |
1288 | sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), |
1289 | tun16_to_cpu(tun, gso.hdr_len)); | |
ef3db4a5 MT |
1290 | print_hex_dump(KERN_ERR, "tun: ", |
1291 | DUMP_PREFIX_NONE, | |
1292 | 16, 1, skb->head, | |
56f0dcc5 | 1293 | min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); |
ef3db4a5 MT |
1294 | WARN_ON_ONCE(1); |
1295 | return -EINVAL; | |
1296 | } | |
f43798c2 RR |
1297 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
1298 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1299 | } else | |
1300 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1301 | ||
1302 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1303 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
56f0dcc5 MT |
1304 | gso.csum_start = cpu_to_tun16(tun, skb_checksum_start_offset(skb) + |
1305 | vlan_hlen); | |
1306 | gso.csum_offset = cpu_to_tun16(tun, skb->csum_offset); | |
10a8d94a JW |
1307 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
1308 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
f43798c2 RR |
1309 | } /* else everything is zero */ |
1310 | ||
e0b46d0e | 1311 | if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) |
f43798c2 | 1312 | return -EFAULT; |
8c847d25 JW |
1313 | |
1314 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); | |
f43798c2 RR |
1315 | } |
1316 | ||
a8f9bfdf | 1317 | if (vlan_hlen) { |
e0b46d0e | 1318 | int ret; |
6680ec68 JW |
1319 | struct { |
1320 | __be16 h_vlan_proto; | |
1321 | __be16 h_vlan_TCI; | |
1322 | } veth; | |
1323 | ||
1324 | veth.h_vlan_proto = skb->vlan_proto; | |
df8a39de | 1325 | veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb)); |
6680ec68 JW |
1326 | |
1327 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
6680ec68 | 1328 | |
e0b46d0e HX |
1329 | ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset); |
1330 | if (ret || !iov_iter_count(iter)) | |
6680ec68 JW |
1331 | goto done; |
1332 | ||
e0b46d0e HX |
1333 | ret = copy_to_iter(&veth, sizeof(veth), iter); |
1334 | if (ret != sizeof(veth) || !iov_iter_count(iter)) | |
6680ec68 JW |
1335 | goto done; |
1336 | } | |
1da177e4 | 1337 | |
e0b46d0e | 1338 | skb_copy_datagram_iter(skb, vlan_offset, iter, skb->len - vlan_offset); |
1da177e4 | 1339 | |
6680ec68 | 1340 | done: |
09f75cd7 | 1341 | tun->dev->stats.tx_packets++; |
e0b46d0e | 1342 | tun->dev->stats.tx_bytes += skb->len + vlan_hlen; |
1da177e4 LT |
1343 | |
1344 | return total; | |
1345 | } | |
1346 | ||
54f968d6 | 1347 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
9b067034 AV |
1348 | struct iov_iter *to, |
1349 | int noblock) | |
1da177e4 | 1350 | { |
1da177e4 | 1351 | struct sk_buff *skb; |
9b067034 | 1352 | ssize_t ret; |
9e641bdc | 1353 | int peeked, err, off = 0; |
1da177e4 | 1354 | |
3872baf6 | 1355 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 1356 | |
9b067034 AV |
1357 | if (!iov_iter_count(to)) |
1358 | return 0; | |
1da177e4 | 1359 | |
9e641bdc XW |
1360 | if (tun->dev->reg_state != NETREG_REGISTERED) |
1361 | return -EIO; | |
1da177e4 | 1362 | |
9e641bdc XW |
1363 | /* Read frames from queue */ |
1364 | skb = __skb_recv_datagram(tfile->socket.sk, noblock ? MSG_DONTWAIT : 0, | |
1365 | &peeked, &off, &err); | |
e0b46d0e | 1366 | if (!skb) |
957f094f | 1367 | return err; |
e0b46d0e | 1368 | |
9b067034 | 1369 | ret = tun_put_user(tun, tfile, skb, to); |
f51a5e82 | 1370 | if (unlikely(ret < 0)) |
f271b2cc | 1371 | kfree_skb(skb); |
f51a5e82 JW |
1372 | else |
1373 | consume_skb(skb); | |
1da177e4 | 1374 | |
05c2828c MT |
1375 | return ret; |
1376 | } | |
1377 | ||
9b067034 | 1378 | static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
05c2828c MT |
1379 | { |
1380 | struct file *file = iocb->ki_filp; | |
1381 | struct tun_file *tfile = file->private_data; | |
1382 | struct tun_struct *tun = __tun_get(tfile); | |
9b067034 | 1383 | ssize_t len = iov_iter_count(to), ret; |
05c2828c MT |
1384 | |
1385 | if (!tun) | |
1386 | return -EBADFD; | |
9b067034 | 1387 | ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK); |
42404c09 | 1388 | ret = min_t(ssize_t, ret, len); |
d0b7da8a ZYW |
1389 | if (ret > 0) |
1390 | iocb->ki_pos = ret; | |
631ab46b | 1391 | tun_put(tun); |
1da177e4 LT |
1392 | return ret; |
1393 | } | |
1394 | ||
96442e42 JW |
1395 | static void tun_free_netdev(struct net_device *dev) |
1396 | { | |
1397 | struct tun_struct *tun = netdev_priv(dev); | |
1398 | ||
4008e97f | 1399 | BUG_ON(!(list_empty(&tun->disabled))); |
96442e42 | 1400 | tun_flow_uninit(tun); |
5dbbaf2d | 1401 | security_tun_dev_free_security(tun->security); |
96442e42 JW |
1402 | free_netdev(dev); |
1403 | } | |
1404 | ||
1da177e4 LT |
1405 | static void tun_setup(struct net_device *dev) |
1406 | { | |
1407 | struct tun_struct *tun = netdev_priv(dev); | |
1408 | ||
0625c883 EB |
1409 | tun->owner = INVALID_UID; |
1410 | tun->group = INVALID_GID; | |
1da177e4 | 1411 | |
1da177e4 | 1412 | dev->ethtool_ops = &tun_ethtool_ops; |
96442e42 | 1413 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
1414 | } |
1415 | ||
f019a7a5 EB |
1416 | /* Trivial set of netlink ops to allow deleting tun or tap |
1417 | * device with netlink. | |
1418 | */ | |
1419 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1420 | { | |
1421 | return -EINVAL; | |
1422 | } | |
1423 | ||
1424 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1425 | .kind = DRV_NAME, | |
1426 | .priv_size = sizeof(struct tun_struct), | |
1427 | .setup = tun_setup, | |
1428 | .validate = tun_validate, | |
1429 | }; | |
1430 | ||
33dccbb0 HX |
1431 | static void tun_sock_write_space(struct sock *sk) |
1432 | { | |
54f968d6 | 1433 | struct tun_file *tfile; |
43815482 | 1434 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1435 | |
1436 | if (!sock_writeable(sk)) | |
1437 | return; | |
1438 | ||
33dccbb0 HX |
1439 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
1440 | return; | |
1441 | ||
43815482 ED |
1442 | wqueue = sk_sleep(sk); |
1443 | if (wqueue && waitqueue_active(wqueue)) | |
1444 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1445 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1446 | |
54f968d6 JW |
1447 | tfile = container_of(sk, struct tun_file, sk); |
1448 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
1449 | } |
1450 | ||
1b784140 | 1451 | static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
05c2828c | 1452 | { |
54f968d6 JW |
1453 | int ret; |
1454 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1455 | struct tun_struct *tun = __tun_get(tfile); | |
1456 | ||
1457 | if (!tun) | |
1458 | return -EBADFD; | |
f5ff53b4 | 1459 | |
c0371da6 | 1460 | ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, |
f5ff53b4 | 1461 | m->msg_flags & MSG_DONTWAIT); |
54f968d6 JW |
1462 | tun_put(tun); |
1463 | return ret; | |
05c2828c MT |
1464 | } |
1465 | ||
1b784140 | 1466 | static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, |
05c2828c MT |
1467 | int flags) |
1468 | { | |
54f968d6 JW |
1469 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
1470 | struct tun_struct *tun = __tun_get(tfile); | |
05c2828c | 1471 | int ret; |
54f968d6 JW |
1472 | |
1473 | if (!tun) | |
1474 | return -EBADFD; | |
1475 | ||
eda29772 | 1476 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
3811ae76 G |
1477 | ret = -EINVAL; |
1478 | goto out; | |
1479 | } | |
eda29772 RC |
1480 | if (flags & MSG_ERRQUEUE) { |
1481 | ret = sock_recv_errqueue(sock->sk, m, total_len, | |
1482 | SOL_PACKET, TUN_TX_TIMESTAMP); | |
1483 | goto out; | |
1484 | } | |
c0371da6 | 1485 | ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT); |
87897931 | 1486 | if (ret > (ssize_t)total_len) { |
42404c09 DM |
1487 | m->msg_flags |= MSG_TRUNC; |
1488 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1489 | } | |
3811ae76 | 1490 | out: |
54f968d6 | 1491 | tun_put(tun); |
05c2828c MT |
1492 | return ret; |
1493 | } | |
1494 | ||
1ab5ecb9 SK |
1495 | static int tun_release(struct socket *sock) |
1496 | { | |
1497 | if (sock->sk) | |
1498 | sock_put(sock->sk); | |
1499 | return 0; | |
1500 | } | |
1501 | ||
05c2828c MT |
1502 | /* Ops structure to mimic raw sockets with tun */ |
1503 | static const struct proto_ops tun_socket_ops = { | |
1504 | .sendmsg = tun_sendmsg, | |
1505 | .recvmsg = tun_recvmsg, | |
1ab5ecb9 | 1506 | .release = tun_release, |
05c2828c MT |
1507 | }; |
1508 | ||
33dccbb0 HX |
1509 | static struct proto tun_proto = { |
1510 | .name = "tun", | |
1511 | .owner = THIS_MODULE, | |
54f968d6 | 1512 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 1513 | }; |
f019a7a5 | 1514 | |
980c9e8c DW |
1515 | static int tun_flags(struct tun_struct *tun) |
1516 | { | |
031f5e03 | 1517 | return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP); |
980c9e8c DW |
1518 | } |
1519 | ||
1520 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1521 | char *buf) | |
1522 | { | |
1523 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1524 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1525 | } | |
1526 | ||
1527 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1528 | char *buf) | |
1529 | { | |
1530 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1531 | return uid_valid(tun->owner)? |
1532 | sprintf(buf, "%u\n", | |
1533 | from_kuid_munged(current_user_ns(), tun->owner)): | |
1534 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1535 | } |
1536 | ||
1537 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1538 | char *buf) | |
1539 | { | |
1540 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1541 | return gid_valid(tun->group) ? |
1542 | sprintf(buf, "%u\n", | |
1543 | from_kgid_munged(current_user_ns(), tun->group)): | |
1544 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1545 | } |
1546 | ||
1547 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1548 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1549 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1550 | ||
c4d33e24 TI |
1551 | static struct attribute *tun_dev_attrs[] = { |
1552 | &dev_attr_tun_flags.attr, | |
1553 | &dev_attr_owner.attr, | |
1554 | &dev_attr_group.attr, | |
1555 | NULL | |
1556 | }; | |
1557 | ||
1558 | static const struct attribute_group tun_attr_group = { | |
1559 | .attrs = tun_dev_attrs | |
1560 | }; | |
1561 | ||
d647a591 | 1562 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
1563 | { |
1564 | struct tun_struct *tun; | |
54f968d6 | 1565 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
1566 | struct net_device *dev; |
1567 | int err; | |
1568 | ||
7c0c3b1a JW |
1569 | if (tfile->detached) |
1570 | return -EINVAL; | |
1571 | ||
74a3e5a7 EB |
1572 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1573 | if (dev) { | |
f85ba780 DW |
1574 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1575 | return -EBUSY; | |
74a3e5a7 EB |
1576 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1577 | tun = netdev_priv(dev); | |
1578 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1579 | tun = netdev_priv(dev); | |
1580 | else | |
1581 | return -EINVAL; | |
1582 | ||
8e6d91ae | 1583 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
40630b82 | 1584 | !!(tun->flags & IFF_MULTI_QUEUE)) |
8e6d91ae JW |
1585 | return -EINVAL; |
1586 | ||
cde8b15f | 1587 | if (tun_not_capable(tun)) |
2b980dbd | 1588 | return -EPERM; |
5dbbaf2d | 1589 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
1590 | if (err < 0) |
1591 | return err; | |
1592 | ||
849c9b6f | 1593 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER); |
a7385ba2 EB |
1594 | if (err < 0) |
1595 | return err; | |
4008e97f | 1596 | |
40630b82 | 1597 | if (tun->flags & IFF_MULTI_QUEUE && |
e8dbad66 JW |
1598 | (tun->numqueues + tun->numdisabled > 1)) { |
1599 | /* One or more queue has already been attached, no need | |
1600 | * to initialize the device again. | |
1601 | */ | |
1602 | return 0; | |
1603 | } | |
6aa20a22 | 1604 | } |
1da177e4 LT |
1605 | else { |
1606 | char *name; | |
1607 | unsigned long flags = 0; | |
edfb6a14 JW |
1608 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
1609 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 1610 | |
c260b772 | 1611 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 1612 | return -EPERM; |
2b980dbd PM |
1613 | err = security_tun_dev_create(); |
1614 | if (err < 0) | |
1615 | return err; | |
ca6bb5d7 | 1616 | |
1da177e4 LT |
1617 | /* Set dev type */ |
1618 | if (ifr->ifr_flags & IFF_TUN) { | |
1619 | /* TUN device */ | |
40630b82 | 1620 | flags |= IFF_TUN; |
1da177e4 LT |
1621 | name = "tun%d"; |
1622 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1623 | /* TAP device */ | |
40630b82 | 1624 | flags |= IFF_TAP; |
1da177e4 | 1625 | name = "tap%d"; |
6aa20a22 | 1626 | } else |
36989b90 | 1627 | return -EINVAL; |
6aa20a22 | 1628 | |
1da177e4 LT |
1629 | if (*ifr->ifr_name) |
1630 | name = ifr->ifr_name; | |
1631 | ||
c8d68e6b | 1632 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
c835a677 TG |
1633 | NET_NAME_UNKNOWN, tun_setup, queues, |
1634 | queues); | |
edfb6a14 | 1635 | |
1da177e4 LT |
1636 | if (!dev) |
1637 | return -ENOMEM; | |
1638 | ||
fc54c658 | 1639 | dev_net_set(dev, net); |
f019a7a5 | 1640 | dev->rtnl_link_ops = &tun_link_ops; |
fb7589a1 | 1641 | dev->ifindex = tfile->ifindex; |
c4d33e24 | 1642 | dev->sysfs_groups[0] = &tun_attr_group; |
758e43b7 | 1643 | |
1da177e4 LT |
1644 | tun = netdev_priv(dev); |
1645 | tun->dev = dev; | |
1646 | tun->flags = flags; | |
f271b2cc | 1647 | tun->txflt.count = 0; |
d9d52b51 | 1648 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 1649 | |
54f968d6 JW |
1650 | tun->filter_attached = false; |
1651 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
33dccbb0 | 1652 | |
96442e42 JW |
1653 | spin_lock_init(&tun->lock); |
1654 | ||
5dbbaf2d PM |
1655 | err = security_tun_dev_alloc_security(&tun->security); |
1656 | if (err < 0) | |
1657 | goto err_free_dev; | |
2b980dbd | 1658 | |
1da177e4 | 1659 | tun_net_init(dev); |
944a1376 | 1660 | tun_flow_init(tun); |
96442e42 | 1661 | |
88255375 | 1662 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
6680ec68 JW |
1663 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
1664 | NETIF_F_HW_VLAN_STAG_TX; | |
88255375 | 1665 | dev->features = dev->hw_features; |
6671b224 FLVC |
1666 | dev->vlan_features = dev->features & |
1667 | ~(NETIF_F_HW_VLAN_CTAG_TX | | |
1668 | NETIF_F_HW_VLAN_STAG_TX); | |
88255375 | 1669 | |
4008e97f | 1670 | INIT_LIST_HEAD(&tun->disabled); |
849c9b6f | 1671 | err = tun_attach(tun, file, false); |
eb0fb363 | 1672 | if (err < 0) |
662ca437 | 1673 | goto err_free_flow; |
eb0fb363 | 1674 | |
1da177e4 LT |
1675 | err = register_netdevice(tun->dev); |
1676 | if (err < 0) | |
662ca437 | 1677 | goto err_detach; |
1da177e4 LT |
1678 | } |
1679 | ||
af668b3c MT |
1680 | netif_carrier_on(tun->dev); |
1681 | ||
6b8a66ee | 1682 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 | 1683 | |
031f5e03 MT |
1684 | tun->flags = (tun->flags & ~TUN_FEATURES) | |
1685 | (ifr->ifr_flags & TUN_FEATURES); | |
c8d68e6b | 1686 | |
e35259a9 MK |
1687 | /* Make sure persistent devices do not get stuck in |
1688 | * xoff state. | |
1689 | */ | |
1690 | if (netif_running(tun->dev)) | |
c8d68e6b | 1691 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 1692 | |
1da177e4 LT |
1693 | strcpy(ifr->ifr_name, tun->dev->name); |
1694 | return 0; | |
1695 | ||
662ca437 JW |
1696 | err_detach: |
1697 | tun_detach_all(dev); | |
1698 | err_free_flow: | |
1699 | tun_flow_uninit(tun); | |
1700 | security_tun_dev_free_security(tun->security); | |
1701 | err_free_dev: | |
1da177e4 | 1702 | free_netdev(dev); |
1da177e4 LT |
1703 | return err; |
1704 | } | |
1705 | ||
9ce99cf6 | 1706 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 1707 | struct ifreq *ifr) |
e3b99556 | 1708 | { |
6b8a66ee | 1709 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1710 | |
1711 | strcpy(ifr->ifr_name, tun->dev->name); | |
1712 | ||
980c9e8c | 1713 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 1714 | |
e3b99556 MM |
1715 | } |
1716 | ||
5228ddc9 RR |
1717 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1718 | * privs required. */ | |
88255375 | 1719 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1720 | { |
c8f44aff | 1721 | netdev_features_t features = 0; |
5228ddc9 RR |
1722 | |
1723 | if (arg & TUN_F_CSUM) { | |
88255375 | 1724 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1725 | arg &= ~TUN_F_CSUM; |
1726 | ||
1727 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1728 | if (arg & TUN_F_TSO_ECN) { | |
1729 | features |= NETIF_F_TSO_ECN; | |
1730 | arg &= ~TUN_F_TSO_ECN; | |
1731 | } | |
1732 | if (arg & TUN_F_TSO4) | |
1733 | features |= NETIF_F_TSO; | |
1734 | if (arg & TUN_F_TSO6) | |
1735 | features |= NETIF_F_TSO6; | |
1736 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1737 | } | |
e3e3c423 VY |
1738 | |
1739 | if (arg & TUN_F_UFO) { | |
1740 | features |= NETIF_F_UFO; | |
1741 | arg &= ~TUN_F_UFO; | |
1742 | } | |
5228ddc9 RR |
1743 | } |
1744 | ||
1745 | /* This gives the user a way to test for new features in future by | |
1746 | * trying to set them. */ | |
1747 | if (arg) | |
1748 | return -EINVAL; | |
1749 | ||
88255375 MM |
1750 | tun->set_features = features; |
1751 | netdev_update_features(tun->dev); | |
5228ddc9 RR |
1752 | |
1753 | return 0; | |
1754 | } | |
1755 | ||
c8d68e6b JW |
1756 | static void tun_detach_filter(struct tun_struct *tun, int n) |
1757 | { | |
1758 | int i; | |
1759 | struct tun_file *tfile; | |
1760 | ||
1761 | for (i = 0; i < n; i++) { | |
b8deabd3 | 1762 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1763 | sk_detach_filter(tfile->socket.sk); |
1764 | } | |
1765 | ||
1766 | tun->filter_attached = false; | |
1767 | } | |
1768 | ||
1769 | static int tun_attach_filter(struct tun_struct *tun) | |
1770 | { | |
1771 | int i, ret = 0; | |
1772 | struct tun_file *tfile; | |
1773 | ||
1774 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1775 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1776 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
1777 | if (ret) { | |
1778 | tun_detach_filter(tun, i); | |
1779 | return ret; | |
1780 | } | |
1781 | } | |
1782 | ||
1783 | tun->filter_attached = true; | |
1784 | return ret; | |
1785 | } | |
1786 | ||
1787 | static void tun_set_sndbuf(struct tun_struct *tun) | |
1788 | { | |
1789 | struct tun_file *tfile; | |
1790 | int i; | |
1791 | ||
1792 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1793 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1794 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
1795 | } | |
1796 | } | |
1797 | ||
cde8b15f JW |
1798 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
1799 | { | |
1800 | struct tun_file *tfile = file->private_data; | |
1801 | struct tun_struct *tun; | |
cde8b15f JW |
1802 | int ret = 0; |
1803 | ||
1804 | rtnl_lock(); | |
1805 | ||
1806 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 1807 | tun = tfile->detached; |
5dbbaf2d | 1808 | if (!tun) { |
cde8b15f | 1809 | ret = -EINVAL; |
5dbbaf2d PM |
1810 | goto unlock; |
1811 | } | |
1812 | ret = security_tun_dev_attach_queue(tun->security); | |
1813 | if (ret < 0) | |
1814 | goto unlock; | |
849c9b6f | 1815 | ret = tun_attach(tun, file, false); |
4008e97f | 1816 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 1817 | tun = rtnl_dereference(tfile->tun); |
40630b82 | 1818 | if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached) |
4008e97f JW |
1819 | ret = -EINVAL; |
1820 | else | |
1821 | __tun_detach(tfile, false); | |
1822 | } else | |
cde8b15f JW |
1823 | ret = -EINVAL; |
1824 | ||
5dbbaf2d | 1825 | unlock: |
cde8b15f JW |
1826 | rtnl_unlock(); |
1827 | return ret; | |
1828 | } | |
1829 | ||
50857e2a AB |
1830 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1831 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1832 | { |
36b50bab | 1833 | struct tun_file *tfile = file->private_data; |
631ab46b | 1834 | struct tun_struct *tun; |
1da177e4 LT |
1835 | void __user* argp = (void __user*)arg; |
1836 | struct ifreq ifr; | |
0625c883 EB |
1837 | kuid_t owner; |
1838 | kgid_t group; | |
33dccbb0 | 1839 | int sndbuf; |
d9d52b51 | 1840 | int vnet_hdr_sz; |
fb7589a1 | 1841 | unsigned int ifindex; |
1cf8e410 | 1842 | int le; |
f271b2cc | 1843 | int ret; |
1da177e4 | 1844 | |
cde8b15f | 1845 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) { |
50857e2a | 1846 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 1847 | return -EFAULT; |
8bbb1813 | 1848 | } else { |
a117dacd | 1849 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 1850 | } |
631ab46b EB |
1851 | if (cmd == TUNGETFEATURES) { |
1852 | /* Currently this just means: "what IFF flags are valid?". | |
1853 | * This is needed because we never checked for invalid flags on | |
031f5e03 MT |
1854 | * TUNSETIFF. |
1855 | */ | |
1856 | return put_user(IFF_TUN | IFF_TAP | TUN_FEATURES, | |
631ab46b | 1857 | (unsigned int __user*)argp); |
cde8b15f JW |
1858 | } else if (cmd == TUNSETQUEUE) |
1859 | return tun_set_queue(file, &ifr); | |
631ab46b | 1860 | |
c8d68e6b | 1861 | ret = 0; |
876bfd4d HX |
1862 | rtnl_lock(); |
1863 | ||
36b50bab | 1864 | tun = __tun_get(tfile); |
1da177e4 | 1865 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1866 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1867 | ||
876bfd4d | 1868 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1869 | |
876bfd4d HX |
1870 | if (ret) |
1871 | goto unlock; | |
1da177e4 | 1872 | |
50857e2a | 1873 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1874 | ret = -EFAULT; |
1875 | goto unlock; | |
1da177e4 | 1876 | } |
fb7589a1 PE |
1877 | if (cmd == TUNSETIFINDEX) { |
1878 | ret = -EPERM; | |
1879 | if (tun) | |
1880 | goto unlock; | |
1881 | ||
1882 | ret = -EFAULT; | |
1883 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) | |
1884 | goto unlock; | |
1885 | ||
1886 | ret = 0; | |
1887 | tfile->ifindex = ifindex; | |
1888 | goto unlock; | |
1889 | } | |
1da177e4 | 1890 | |
876bfd4d | 1891 | ret = -EBADFD; |
1da177e4 | 1892 | if (!tun) |
876bfd4d | 1893 | goto unlock; |
1da177e4 | 1894 | |
1e588338 | 1895 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 1896 | |
631ab46b | 1897 | ret = 0; |
1da177e4 | 1898 | switch (cmd) { |
e3b99556 | 1899 | case TUNGETIFF: |
9ce99cf6 | 1900 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1901 | |
3d407a80 PE |
1902 | if (tfile->detached) |
1903 | ifr.ifr_flags |= IFF_DETACH_QUEUE; | |
849c9b6f PE |
1904 | if (!tfile->socket.sk->sk_filter) |
1905 | ifr.ifr_flags |= IFF_NOFILTER; | |
3d407a80 | 1906 | |
50857e2a | 1907 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1908 | ret = -EFAULT; |
e3b99556 MM |
1909 | break; |
1910 | ||
1da177e4 LT |
1911 | case TUNSETNOCSUM: |
1912 | /* Disable/Enable checksum */ | |
1da177e4 | 1913 | |
88255375 MM |
1914 | /* [unimplemented] */ |
1915 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 1916 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
1917 | break; |
1918 | ||
1919 | case TUNSETPERSIST: | |
54f968d6 JW |
1920 | /* Disable/Enable persist mode. Keep an extra reference to the |
1921 | * module to prevent the module being unprobed. | |
1922 | */ | |
40630b82 MT |
1923 | if (arg && !(tun->flags & IFF_PERSIST)) { |
1924 | tun->flags |= IFF_PERSIST; | |
54f968d6 | 1925 | __module_get(THIS_MODULE); |
dd38bd85 | 1926 | } |
40630b82 MT |
1927 | if (!arg && (tun->flags & IFF_PERSIST)) { |
1928 | tun->flags &= ~IFF_PERSIST; | |
54f968d6 JW |
1929 | module_put(THIS_MODULE); |
1930 | } | |
1da177e4 | 1931 | |
6b8a66ee JP |
1932 | tun_debug(KERN_INFO, tun, "persist %s\n", |
1933 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
1934 | break; |
1935 | ||
1936 | case TUNSETOWNER: | |
1937 | /* Set owner of the device */ | |
0625c883 EB |
1938 | owner = make_kuid(current_user_ns(), arg); |
1939 | if (!uid_valid(owner)) { | |
1940 | ret = -EINVAL; | |
1941 | break; | |
1942 | } | |
1943 | tun->owner = owner; | |
1e588338 | 1944 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 1945 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
1946 | break; |
1947 | ||
8c644623 GG |
1948 | case TUNSETGROUP: |
1949 | /* Set group of the device */ | |
0625c883 EB |
1950 | group = make_kgid(current_user_ns(), arg); |
1951 | if (!gid_valid(group)) { | |
1952 | ret = -EINVAL; | |
1953 | break; | |
1954 | } | |
1955 | tun->group = group; | |
1e588338 | 1956 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 1957 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
1958 | break; |
1959 | ||
ff4cc3ac MK |
1960 | case TUNSETLINK: |
1961 | /* Only allow setting the type when the interface is down */ | |
1962 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
1963 | tun_debug(KERN_INFO, tun, |
1964 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 1965 | ret = -EBUSY; |
ff4cc3ac MK |
1966 | } else { |
1967 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
1968 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
1969 | tun->dev->type); | |
48abfe05 | 1970 | ret = 0; |
ff4cc3ac | 1971 | } |
631ab46b | 1972 | break; |
ff4cc3ac | 1973 | |
1da177e4 LT |
1974 | #ifdef TUN_DEBUG |
1975 | case TUNSETDEBUG: | |
1976 | tun->debug = arg; | |
1977 | break; | |
1978 | #endif | |
5228ddc9 | 1979 | case TUNSETOFFLOAD: |
88255375 | 1980 | ret = set_offload(tun, arg); |
631ab46b | 1981 | break; |
5228ddc9 | 1982 | |
f271b2cc MK |
1983 | case TUNSETTXFILTER: |
1984 | /* Can be set only for TAPs */ | |
631ab46b | 1985 | ret = -EINVAL; |
40630b82 | 1986 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
631ab46b | 1987 | break; |
c0e5a8c2 | 1988 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 1989 | break; |
1da177e4 LT |
1990 | |
1991 | case SIOCGIFHWADDR: | |
b595076a | 1992 | /* Get hw address */ |
f271b2cc MK |
1993 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
1994 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 1995 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
1996 | ret = -EFAULT; |
1997 | break; | |
1da177e4 LT |
1998 | |
1999 | case SIOCSIFHWADDR: | |
f271b2cc | 2000 | /* Set hw address */ |
6b8a66ee JP |
2001 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
2002 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 2003 | |
40102371 | 2004 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 2005 | break; |
33dccbb0 HX |
2006 | |
2007 | case TUNGETSNDBUF: | |
54f968d6 | 2008 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
2009 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
2010 | ret = -EFAULT; | |
2011 | break; | |
2012 | ||
2013 | case TUNSETSNDBUF: | |
2014 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
2015 | ret = -EFAULT; | |
2016 | break; | |
2017 | } | |
2018 | ||
c8d68e6b JW |
2019 | tun->sndbuf = sndbuf; |
2020 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
2021 | break; |
2022 | ||
d9d52b51 MT |
2023 | case TUNGETVNETHDRSZ: |
2024 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
2025 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
2026 | ret = -EFAULT; | |
2027 | break; | |
2028 | ||
2029 | case TUNSETVNETHDRSZ: | |
2030 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
2031 | ret = -EFAULT; | |
2032 | break; | |
2033 | } | |
2034 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
2035 | ret = -EINVAL; | |
2036 | break; | |
2037 | } | |
2038 | ||
2039 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
2040 | break; | |
2041 | ||
1cf8e410 MT |
2042 | case TUNGETVNETLE: |
2043 | le = !!(tun->flags & TUN_VNET_LE); | |
2044 | if (put_user(le, (int __user *)argp)) | |
2045 | ret = -EFAULT; | |
2046 | break; | |
2047 | ||
2048 | case TUNSETVNETLE: | |
2049 | if (get_user(le, (int __user *)argp)) { | |
2050 | ret = -EFAULT; | |
2051 | break; | |
2052 | } | |
2053 | if (le) | |
2054 | tun->flags |= TUN_VNET_LE; | |
2055 | else | |
2056 | tun->flags &= ~TUN_VNET_LE; | |
2057 | break; | |
2058 | ||
99405162 MT |
2059 | case TUNATTACHFILTER: |
2060 | /* Can be set only for TAPs */ | |
2061 | ret = -EINVAL; | |
40630b82 | 2062 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 MT |
2063 | break; |
2064 | ret = -EFAULT; | |
54f968d6 | 2065 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
2066 | break; |
2067 | ||
c8d68e6b | 2068 | ret = tun_attach_filter(tun); |
99405162 MT |
2069 | break; |
2070 | ||
2071 | case TUNDETACHFILTER: | |
2072 | /* Can be set only for TAPs */ | |
2073 | ret = -EINVAL; | |
40630b82 | 2074 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 | 2075 | break; |
c8d68e6b JW |
2076 | ret = 0; |
2077 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
2078 | break; |
2079 | ||
76975e9c PE |
2080 | case TUNGETFILTER: |
2081 | ret = -EINVAL; | |
40630b82 | 2082 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
76975e9c PE |
2083 | break; |
2084 | ret = -EFAULT; | |
2085 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) | |
2086 | break; | |
2087 | ret = 0; | |
2088 | break; | |
2089 | ||
1da177e4 | 2090 | default: |
631ab46b EB |
2091 | ret = -EINVAL; |
2092 | break; | |
ee289b64 | 2093 | } |
1da177e4 | 2094 | |
876bfd4d HX |
2095 | unlock: |
2096 | rtnl_unlock(); | |
2097 | if (tun) | |
2098 | tun_put(tun); | |
631ab46b | 2099 | return ret; |
1da177e4 LT |
2100 | } |
2101 | ||
50857e2a AB |
2102 | static long tun_chr_ioctl(struct file *file, |
2103 | unsigned int cmd, unsigned long arg) | |
2104 | { | |
2105 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
2106 | } | |
2107 | ||
2108 | #ifdef CONFIG_COMPAT | |
2109 | static long tun_chr_compat_ioctl(struct file *file, | |
2110 | unsigned int cmd, unsigned long arg) | |
2111 | { | |
2112 | switch (cmd) { | |
2113 | case TUNSETIFF: | |
2114 | case TUNGETIFF: | |
2115 | case TUNSETTXFILTER: | |
2116 | case TUNGETSNDBUF: | |
2117 | case TUNSETSNDBUF: | |
2118 | case SIOCGIFHWADDR: | |
2119 | case SIOCSIFHWADDR: | |
2120 | arg = (unsigned long)compat_ptr(arg); | |
2121 | break; | |
2122 | default: | |
2123 | arg = (compat_ulong_t)arg; | |
2124 | break; | |
2125 | } | |
2126 | ||
2127 | /* | |
2128 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
2129 | * the end of that structure. All fields that are used in this | |
2130 | * driver are compatible though, we don't need to convert the | |
2131 | * contents. | |
2132 | */ | |
2133 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
2134 | } | |
2135 | #endif /* CONFIG_COMPAT */ | |
2136 | ||
1da177e4 LT |
2137 | static int tun_chr_fasync(int fd, struct file *file, int on) |
2138 | { | |
54f968d6 | 2139 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2140 | int ret; |
2141 | ||
54f968d6 | 2142 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 2143 | goto out; |
6aa20a22 | 2144 | |
1da177e4 | 2145 | if (on) { |
e0b93edd | 2146 | __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
54f968d6 | 2147 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 2148 | } else |
54f968d6 | 2149 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
2150 | ret = 0; |
2151 | out: | |
9d319522 | 2152 | return ret; |
1da177e4 LT |
2153 | } |
2154 | ||
2155 | static int tun_chr_open(struct inode *inode, struct file * file) | |
2156 | { | |
631ab46b | 2157 | struct tun_file *tfile; |
deed49fb | 2158 | |
6b8a66ee | 2159 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 2160 | |
54f968d6 JW |
2161 | tfile = (struct tun_file *)sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL, |
2162 | &tun_proto); | |
631ab46b EB |
2163 | if (!tfile) |
2164 | return -ENOMEM; | |
c956674b | 2165 | RCU_INIT_POINTER(tfile->tun, NULL); |
36b50bab | 2166 | tfile->net = get_net(current->nsproxy->net_ns); |
54f968d6 | 2167 | tfile->flags = 0; |
fb7589a1 | 2168 | tfile->ifindex = 0; |
54f968d6 | 2169 | |
54f968d6 | 2170 | init_waitqueue_head(&tfile->wq.wait); |
9e641bdc | 2171 | RCU_INIT_POINTER(tfile->socket.wq, &tfile->wq); |
54f968d6 JW |
2172 | |
2173 | tfile->socket.file = file; | |
2174 | tfile->socket.ops = &tun_socket_ops; | |
2175 | ||
2176 | sock_init_data(&tfile->socket, &tfile->sk); | |
2177 | sk_change_net(&tfile->sk, tfile->net); | |
2178 | ||
2179 | tfile->sk.sk_write_space = tun_sock_write_space; | |
2180 | tfile->sk.sk_sndbuf = INT_MAX; | |
2181 | ||
631ab46b | 2182 | file->private_data = tfile; |
54f968d6 | 2183 | set_bit(SOCK_EXTERNALLY_ALLOCATED, &tfile->socket.flags); |
4008e97f | 2184 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 2185 | |
19a6afb2 JW |
2186 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
2187 | ||
1da177e4 LT |
2188 | return 0; |
2189 | } | |
2190 | ||
2191 | static int tun_chr_close(struct inode *inode, struct file *file) | |
2192 | { | |
631ab46b | 2193 | struct tun_file *tfile = file->private_data; |
54f968d6 | 2194 | struct net *net = tfile->net; |
1da177e4 | 2195 | |
c8d68e6b | 2196 | tun_detach(tfile, true); |
54f968d6 | 2197 | put_net(net); |
1da177e4 LT |
2198 | |
2199 | return 0; | |
2200 | } | |
2201 | ||
93e14b6d | 2202 | #ifdef CONFIG_PROC_FS |
a3816ab0 | 2203 | static void tun_chr_show_fdinfo(struct seq_file *m, struct file *f) |
93e14b6d MY |
2204 | { |
2205 | struct tun_struct *tun; | |
2206 | struct ifreq ifr; | |
2207 | ||
2208 | memset(&ifr, 0, sizeof(ifr)); | |
2209 | ||
2210 | rtnl_lock(); | |
2211 | tun = tun_get(f); | |
2212 | if (tun) | |
2213 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); | |
2214 | rtnl_unlock(); | |
2215 | ||
2216 | if (tun) | |
2217 | tun_put(tun); | |
2218 | ||
a3816ab0 | 2219 | seq_printf(m, "iff:\t%s\n", ifr.ifr_name); |
93e14b6d MY |
2220 | } |
2221 | #endif | |
2222 | ||
d54b1fdb | 2223 | static const struct file_operations tun_fops = { |
6aa20a22 | 2224 | .owner = THIS_MODULE, |
1da177e4 | 2225 | .llseek = no_llseek, |
9b067034 | 2226 | .read_iter = tun_chr_read_iter, |
f5ff53b4 | 2227 | .write_iter = tun_chr_write_iter, |
1da177e4 | 2228 | .poll = tun_chr_poll, |
50857e2a AB |
2229 | .unlocked_ioctl = tun_chr_ioctl, |
2230 | #ifdef CONFIG_COMPAT | |
2231 | .compat_ioctl = tun_chr_compat_ioctl, | |
2232 | #endif | |
1da177e4 LT |
2233 | .open = tun_chr_open, |
2234 | .release = tun_chr_close, | |
93e14b6d MY |
2235 | .fasync = tun_chr_fasync, |
2236 | #ifdef CONFIG_PROC_FS | |
2237 | .show_fdinfo = tun_chr_show_fdinfo, | |
2238 | #endif | |
1da177e4 LT |
2239 | }; |
2240 | ||
2241 | static struct miscdevice tun_miscdev = { | |
2242 | .minor = TUN_MINOR, | |
2243 | .name = "tun", | |
e454cea2 | 2244 | .nodename = "net/tun", |
1da177e4 | 2245 | .fops = &tun_fops, |
1da177e4 LT |
2246 | }; |
2247 | ||
2248 | /* ethtool interface */ | |
2249 | ||
2250 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
2251 | { | |
2252 | cmd->supported = 0; | |
2253 | cmd->advertising = 0; | |
70739497 | 2254 | ethtool_cmd_speed_set(cmd, SPEED_10); |
1da177e4 LT |
2255 | cmd->duplex = DUPLEX_FULL; |
2256 | cmd->port = PORT_TP; | |
2257 | cmd->phy_address = 0; | |
2258 | cmd->transceiver = XCVR_INTERNAL; | |
2259 | cmd->autoneg = AUTONEG_DISABLE; | |
2260 | cmd->maxtxpkt = 0; | |
2261 | cmd->maxrxpkt = 0; | |
2262 | return 0; | |
2263 | } | |
2264 | ||
2265 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
2266 | { | |
2267 | struct tun_struct *tun = netdev_priv(dev); | |
2268 | ||
33a5ba14 RJ |
2269 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
2270 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
2271 | |
2272 | switch (tun->flags & TUN_TYPE_MASK) { | |
40630b82 | 2273 | case IFF_TUN: |
33a5ba14 | 2274 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 | 2275 | break; |
40630b82 | 2276 | case IFF_TAP: |
33a5ba14 | 2277 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
2278 | break; |
2279 | } | |
2280 | } | |
2281 | ||
2282 | static u32 tun_get_msglevel(struct net_device *dev) | |
2283 | { | |
2284 | #ifdef TUN_DEBUG | |
2285 | struct tun_struct *tun = netdev_priv(dev); | |
2286 | return tun->debug; | |
2287 | #else | |
2288 | return -EOPNOTSUPP; | |
2289 | #endif | |
2290 | } | |
2291 | ||
2292 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
2293 | { | |
2294 | #ifdef TUN_DEBUG | |
2295 | struct tun_struct *tun = netdev_priv(dev); | |
2296 | tun->debug = value; | |
2297 | #endif | |
2298 | } | |
2299 | ||
7282d491 | 2300 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
2301 | .get_settings = tun_get_settings, |
2302 | .get_drvinfo = tun_get_drvinfo, | |
2303 | .get_msglevel = tun_get_msglevel, | |
2304 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 2305 | .get_link = ethtool_op_get_link, |
eda29772 | 2306 | .get_ts_info = ethtool_op_get_ts_info, |
1da177e4 LT |
2307 | }; |
2308 | ||
79d17604 | 2309 | |
1da177e4 LT |
2310 | static int __init tun_init(void) |
2311 | { | |
2312 | int ret = 0; | |
2313 | ||
6b8a66ee JP |
2314 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
2315 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 2316 | |
f019a7a5 | 2317 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 2318 | if (ret) { |
6b8a66ee | 2319 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 2320 | goto err_linkops; |
79d17604 PE |
2321 | } |
2322 | ||
1da177e4 | 2323 | ret = misc_register(&tun_miscdev); |
79d17604 | 2324 | if (ret) { |
6b8a66ee | 2325 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
2326 | goto err_misc; |
2327 | } | |
f019a7a5 | 2328 | return 0; |
79d17604 | 2329 | err_misc: |
f019a7a5 EB |
2330 | rtnl_link_unregister(&tun_link_ops); |
2331 | err_linkops: | |
1da177e4 LT |
2332 | return ret; |
2333 | } | |
2334 | ||
2335 | static void tun_cleanup(void) | |
2336 | { | |
6aa20a22 | 2337 | misc_deregister(&tun_miscdev); |
f019a7a5 | 2338 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
2339 | } |
2340 | ||
05c2828c MT |
2341 | /* Get an underlying socket object from tun file. Returns error unless file is |
2342 | * attached to a device. The returned object works like a packet socket, it | |
2343 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
2344 | * holding a reference to the file for as long as the socket is in use. */ | |
2345 | struct socket *tun_get_socket(struct file *file) | |
2346 | { | |
6e914fc7 | 2347 | struct tun_file *tfile; |
05c2828c MT |
2348 | if (file->f_op != &tun_fops) |
2349 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
2350 | tfile = file->private_data; |
2351 | if (!tfile) | |
05c2828c | 2352 | return ERR_PTR(-EBADFD); |
54f968d6 | 2353 | return &tfile->socket; |
05c2828c MT |
2354 | } |
2355 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
2356 | ||
1da177e4 LT |
2357 | module_init(tun_init); |
2358 | module_exit(tun_cleanup); | |
2359 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
2360 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
2361 | MODULE_LICENSE("GPL"); | |
2362 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 2363 | MODULE_ALIAS("devname:net/tun"); |