]>
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> |
5188cd44 | 68 | #include <net/ipv6.h> |
881d966b | 69 | #include <net/net_namespace.h> |
79d17604 | 70 | #include <net/netns/generic.h> |
f019a7a5 | 71 | #include <net/rtnetlink.h> |
33dccbb0 | 72 | #include <net/sock.h> |
93e14b6d | 73 | #include <linux/seq_file.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 | ||
0690899b MT |
106 | #define GOODCOPY_LEN 128 |
107 | ||
f271b2cc MK |
108 | #define FLT_EXACT_COUNT 8 |
109 | struct tap_filter { | |
110 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
111 | u32 mask[2]; /* Mask of the hashed addrs */ | |
112 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
113 | }; | |
114 | ||
92d4ea6e | 115 | /* DEFAULT_MAX_NUM_RSS_QUEUES were chosen to let the rx/tx queues allocated for |
edfb6a14 JW |
116 | * the netdevice to be fit in one page. So we can make sure the success of |
117 | * memory allocation. TODO: increase the limit. */ | |
118 | #define MAX_TAP_QUEUES DEFAULT_MAX_NUM_RSS_QUEUES | |
b8732fb7 | 119 | #define MAX_TAP_FLOWS 4096 |
c8d68e6b | 120 | |
96442e42 JW |
121 | #define TUN_FLOW_EXPIRE (3 * HZ) |
122 | ||
54f968d6 | 123 | /* A tun_file connects an open character device to a tuntap netdevice. It |
92d4ea6e | 124 | * also contains all socket related structures (except sock_fprog and tap_filter) |
54f968d6 JW |
125 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
126 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 127 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 128 | * this). |
6e914fc7 JW |
129 | * |
130 | * RCU usage: | |
36fe8c09 | 131 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 132 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 133 | */ |
631ab46b | 134 | struct tun_file { |
54f968d6 JW |
135 | struct sock sk; |
136 | struct socket socket; | |
137 | struct socket_wq wq; | |
6e914fc7 | 138 | struct tun_struct __rcu *tun; |
36b50bab | 139 | struct net *net; |
54f968d6 JW |
140 | struct fasync_struct *fasync; |
141 | /* only used for fasnyc */ | |
142 | unsigned int flags; | |
fb7589a1 PE |
143 | union { |
144 | u16 queue_index; | |
145 | unsigned int ifindex; | |
146 | }; | |
4008e97f JW |
147 | struct list_head next; |
148 | struct tun_struct *detached; | |
631ab46b EB |
149 | }; |
150 | ||
96442e42 JW |
151 | struct tun_flow_entry { |
152 | struct hlist_node hash_link; | |
153 | struct rcu_head rcu; | |
154 | struct tun_struct *tun; | |
155 | ||
156 | u32 rxhash; | |
9bc88939 | 157 | u32 rps_rxhash; |
96442e42 JW |
158 | int queue_index; |
159 | unsigned long updated; | |
160 | }; | |
161 | ||
162 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
163 | ||
54f968d6 | 164 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 165 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
166 | * file were attached to a persist device. |
167 | */ | |
14daa021 | 168 | struct tun_struct { |
c8d68e6b JW |
169 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
170 | unsigned int numqueues; | |
f271b2cc | 171 | unsigned int flags; |
0625c883 EB |
172 | kuid_t owner; |
173 | kgid_t group; | |
14daa021 | 174 | |
14daa021 | 175 | struct net_device *dev; |
c8f44aff | 176 | netdev_features_t set_features; |
88255375 | 177 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
3d0ad094 | 178 | NETIF_F_TSO6) |
d9d52b51 MT |
179 | |
180 | int vnet_hdr_sz; | |
54f968d6 JW |
181 | int sndbuf; |
182 | struct tap_filter txflt; | |
183 | struct sock_fprog fprog; | |
184 | /* protected by rtnl lock */ | |
185 | bool filter_attached; | |
14daa021 RR |
186 | #ifdef TUN_DEBUG |
187 | int debug; | |
1da177e4 | 188 | #endif |
96442e42 | 189 | spinlock_t lock; |
96442e42 JW |
190 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
191 | struct timer_list flow_gc_timer; | |
192 | unsigned long ageing_time; | |
4008e97f JW |
193 | unsigned int numdisabled; |
194 | struct list_head disabled; | |
5dbbaf2d | 195 | void *security; |
b8732fb7 | 196 | u32 flow_count; |
14daa021 | 197 | }; |
1da177e4 | 198 | |
96442e42 JW |
199 | static inline u32 tun_hashfn(u32 rxhash) |
200 | { | |
201 | return rxhash & 0x3ff; | |
202 | } | |
203 | ||
204 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
205 | { | |
206 | struct tun_flow_entry *e; | |
96442e42 | 207 | |
b67bfe0d | 208 | hlist_for_each_entry_rcu(e, head, hash_link) { |
96442e42 JW |
209 | if (e->rxhash == rxhash) |
210 | return e; | |
211 | } | |
212 | return NULL; | |
213 | } | |
214 | ||
215 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
216 | struct hlist_head *head, | |
217 | u32 rxhash, u16 queue_index) | |
218 | { | |
9fdc6bef ED |
219 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
220 | ||
96442e42 JW |
221 | if (e) { |
222 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
223 | rxhash, queue_index); | |
224 | e->updated = jiffies; | |
225 | e->rxhash = rxhash; | |
9bc88939 | 226 | e->rps_rxhash = 0; |
96442e42 JW |
227 | e->queue_index = queue_index; |
228 | e->tun = tun; | |
229 | hlist_add_head_rcu(&e->hash_link, head); | |
b8732fb7 | 230 | ++tun->flow_count; |
96442e42 JW |
231 | } |
232 | return e; | |
233 | } | |
234 | ||
96442e42 JW |
235 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
236 | { | |
237 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
238 | e->rxhash, e->queue_index); | |
9bc88939 | 239 | sock_rps_reset_flow_hash(e->rps_rxhash); |
96442e42 | 240 | hlist_del_rcu(&e->hash_link); |
9fdc6bef | 241 | kfree_rcu(e, rcu); |
b8732fb7 | 242 | --tun->flow_count; |
96442e42 JW |
243 | } |
244 | ||
245 | static void tun_flow_flush(struct tun_struct *tun) | |
246 | { | |
247 | int i; | |
248 | ||
249 | spin_lock_bh(&tun->lock); | |
250 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
251 | struct tun_flow_entry *e; | |
b67bfe0d | 252 | struct hlist_node *n; |
96442e42 | 253 | |
b67bfe0d | 254 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
96442e42 JW |
255 | tun_flow_delete(tun, e); |
256 | } | |
257 | spin_unlock_bh(&tun->lock); | |
258 | } | |
259 | ||
260 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
261 | { | |
262 | int i; | |
263 | ||
264 | spin_lock_bh(&tun->lock); | |
265 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
266 | struct tun_flow_entry *e; | |
b67bfe0d | 267 | struct hlist_node *n; |
96442e42 | 268 | |
b67bfe0d | 269 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
270 | if (e->queue_index == queue_index) |
271 | tun_flow_delete(tun, e); | |
272 | } | |
273 | } | |
274 | spin_unlock_bh(&tun->lock); | |
275 | } | |
276 | ||
277 | static void tun_flow_cleanup(unsigned long data) | |
278 | { | |
279 | struct tun_struct *tun = (struct tun_struct *)data; | |
280 | unsigned long delay = tun->ageing_time; | |
281 | unsigned long next_timer = jiffies + delay; | |
282 | unsigned long count = 0; | |
283 | int i; | |
284 | ||
285 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
286 | ||
287 | spin_lock_bh(&tun->lock); | |
288 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
289 | struct tun_flow_entry *e; | |
b67bfe0d | 290 | struct hlist_node *n; |
96442e42 | 291 | |
b67bfe0d | 292 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
293 | unsigned long this_timer; |
294 | count++; | |
295 | this_timer = e->updated + delay; | |
296 | if (time_before_eq(this_timer, jiffies)) | |
297 | tun_flow_delete(tun, e); | |
298 | else if (time_before(this_timer, next_timer)) | |
299 | next_timer = this_timer; | |
300 | } | |
301 | } | |
302 | ||
303 | if (count) | |
304 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
305 | spin_unlock_bh(&tun->lock); | |
306 | } | |
307 | ||
49974420 | 308 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
9e85722d | 309 | struct tun_file *tfile) |
96442e42 JW |
310 | { |
311 | struct hlist_head *head; | |
312 | struct tun_flow_entry *e; | |
313 | unsigned long delay = tun->ageing_time; | |
9e85722d | 314 | u16 queue_index = tfile->queue_index; |
96442e42 JW |
315 | |
316 | if (!rxhash) | |
317 | return; | |
318 | else | |
319 | head = &tun->flows[tun_hashfn(rxhash)]; | |
320 | ||
321 | rcu_read_lock(); | |
322 | ||
9e85722d JW |
323 | /* We may get a very small possibility of OOO during switching, not |
324 | * worth to optimize.*/ | |
325 | if (tun->numqueues == 1 || tfile->detached) | |
96442e42 JW |
326 | goto unlock; |
327 | ||
328 | e = tun_flow_find(head, rxhash); | |
329 | if (likely(e)) { | |
330 | /* TODO: keep queueing to old queue until it's empty? */ | |
331 | e->queue_index = queue_index; | |
332 | e->updated = jiffies; | |
9bc88939 | 333 | sock_rps_record_flow_hash(e->rps_rxhash); |
96442e42 JW |
334 | } else { |
335 | spin_lock_bh(&tun->lock); | |
b8732fb7 JW |
336 | if (!tun_flow_find(head, rxhash) && |
337 | tun->flow_count < MAX_TAP_FLOWS) | |
96442e42 JW |
338 | tun_flow_create(tun, head, rxhash, queue_index); |
339 | ||
340 | if (!timer_pending(&tun->flow_gc_timer)) | |
341 | mod_timer(&tun->flow_gc_timer, | |
342 | round_jiffies_up(jiffies + delay)); | |
343 | spin_unlock_bh(&tun->lock); | |
344 | } | |
345 | ||
346 | unlock: | |
347 | rcu_read_unlock(); | |
348 | } | |
349 | ||
9bc88939 TH |
350 | /** |
351 | * Save the hash received in the stack receive path and update the | |
352 | * flow_hash table accordingly. | |
353 | */ | |
354 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) | |
355 | { | |
356 | if (unlikely(e->rps_rxhash != hash)) { | |
357 | sock_rps_reset_flow_hash(e->rps_rxhash); | |
358 | e->rps_rxhash = hash; | |
359 | } | |
360 | } | |
361 | ||
c8d68e6b | 362 | /* We try to identify a flow through its rxhash first. The reason that |
92d4ea6e | 363 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
c8d68e6b JW |
364 | * the rxq based on the txq where the last packet of the flow comes. As |
365 | * the userspace application move between processors, we may get a | |
366 | * different rxq no. here. If we could not get rxhash, then we would | |
367 | * hope the rxq no. may help here. | |
368 | */ | |
f663dd9a | 369 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, |
99932d4f | 370 | void *accel_priv, select_queue_fallback_t fallback) |
c8d68e6b JW |
371 | { |
372 | struct tun_struct *tun = netdev_priv(dev); | |
96442e42 | 373 | struct tun_flow_entry *e; |
c8d68e6b JW |
374 | u32 txq = 0; |
375 | u32 numqueues = 0; | |
376 | ||
377 | rcu_read_lock(); | |
92bb73ea | 378 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 379 | |
3958afa1 | 380 | txq = skb_get_hash(skb); |
c8d68e6b | 381 | if (txq) { |
96442e42 | 382 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
9bc88939 | 383 | if (e) { |
9bc88939 | 384 | tun_flow_save_rps_rxhash(e, txq); |
fbe4d456 | 385 | txq = e->queue_index; |
9bc88939 | 386 | } else |
96442e42 JW |
387 | /* use multiply and shift instead of expensive divide */ |
388 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
389 | } else if (likely(skb_rx_queue_recorded(skb))) { |
390 | txq = skb_get_rx_queue(skb); | |
391 | while (unlikely(txq >= numqueues)) | |
392 | txq -= numqueues; | |
393 | } | |
394 | ||
395 | rcu_read_unlock(); | |
396 | return txq; | |
397 | } | |
398 | ||
cde8b15f JW |
399 | static inline bool tun_not_capable(struct tun_struct *tun) |
400 | { | |
401 | const struct cred *cred = current_cred(); | |
c260b772 | 402 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
403 | |
404 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
405 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 406 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
407 | } |
408 | ||
c8d68e6b JW |
409 | static void tun_set_real_num_queues(struct tun_struct *tun) |
410 | { | |
411 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
412 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
413 | } | |
414 | ||
4008e97f JW |
415 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
416 | { | |
417 | tfile->detached = tun; | |
418 | list_add_tail(&tfile->next, &tun->disabled); | |
419 | ++tun->numdisabled; | |
420 | } | |
421 | ||
d32649d1 | 422 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
423 | { |
424 | struct tun_struct *tun = tfile->detached; | |
425 | ||
426 | tfile->detached = NULL; | |
427 | list_del_init(&tfile->next); | |
428 | --tun->numdisabled; | |
429 | return tun; | |
430 | } | |
431 | ||
4bfb0513 JW |
432 | static void tun_queue_purge(struct tun_file *tfile) |
433 | { | |
434 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
435 | skb_queue_purge(&tfile->sk.sk_error_queue); | |
436 | } | |
437 | ||
c8d68e6b JW |
438 | static void __tun_detach(struct tun_file *tfile, bool clean) |
439 | { | |
440 | struct tun_file *ntfile; | |
441 | struct tun_struct *tun; | |
c8d68e6b | 442 | |
b8deabd3 JW |
443 | tun = rtnl_dereference(tfile->tun); |
444 | ||
9e85722d | 445 | if (tun && !tfile->detached) { |
c8d68e6b JW |
446 | u16 index = tfile->queue_index; |
447 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
448 | |
449 | rcu_assign_pointer(tun->tfiles[index], | |
450 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 451 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
452 | ntfile->queue_index = index; |
453 | ||
454 | --tun->numqueues; | |
9e85722d | 455 | if (clean) { |
c956674b | 456 | RCU_INIT_POINTER(tfile->tun, NULL); |
4008e97f | 457 | sock_put(&tfile->sk); |
9e85722d | 458 | } else |
4008e97f | 459 | tun_disable_queue(tun, tfile); |
c8d68e6b JW |
460 | |
461 | synchronize_net(); | |
96442e42 | 462 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b | 463 | /* Drop read queue */ |
4bfb0513 | 464 | tun_queue_purge(tfile); |
c8d68e6b | 465 | tun_set_real_num_queues(tun); |
dd38bd85 | 466 | } else if (tfile->detached && clean) { |
4008e97f | 467 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
468 | sock_put(&tfile->sk); |
469 | } | |
c8d68e6b JW |
470 | |
471 | if (clean) { | |
af668b3c MT |
472 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
473 | netif_carrier_off(tun->dev); | |
474 | ||
475 | if (!(tun->flags & TUN_PERSIST) && | |
476 | tun->dev->reg_state == NETREG_REGISTERED) | |
4008e97f | 477 | unregister_netdevice(tun->dev); |
af668b3c | 478 | } |
4008e97f | 479 | |
c8d68e6b JW |
480 | BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED, |
481 | &tfile->socket.flags)); | |
482 | sk_release_kernel(&tfile->sk); | |
483 | } | |
484 | } | |
485 | ||
486 | static void tun_detach(struct tun_file *tfile, bool clean) | |
487 | { | |
488 | rtnl_lock(); | |
489 | __tun_detach(tfile, clean); | |
490 | rtnl_unlock(); | |
491 | } | |
492 | ||
493 | static void tun_detach_all(struct net_device *dev) | |
494 | { | |
495 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 496 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
497 | int i, n = tun->numqueues; |
498 | ||
499 | for (i = 0; i < n; i++) { | |
b8deabd3 | 500 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 501 | BUG_ON(!tfile); |
9e641bdc | 502 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 503 | RCU_INIT_POINTER(tfile->tun, NULL); |
c8d68e6b JW |
504 | --tun->numqueues; |
505 | } | |
9e85722d | 506 | list_for_each_entry(tfile, &tun->disabled, next) { |
9e641bdc | 507 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 508 | RCU_INIT_POINTER(tfile->tun, NULL); |
9e85722d | 509 | } |
c8d68e6b JW |
510 | BUG_ON(tun->numqueues != 0); |
511 | ||
512 | synchronize_net(); | |
513 | for (i = 0; i < n; i++) { | |
b8deabd3 | 514 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 515 | /* Drop read queue */ |
4bfb0513 | 516 | tun_queue_purge(tfile); |
c8d68e6b JW |
517 | sock_put(&tfile->sk); |
518 | } | |
4008e97f JW |
519 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
520 | tun_enable_queue(tfile); | |
4bfb0513 | 521 | tun_queue_purge(tfile); |
4008e97f JW |
522 | sock_put(&tfile->sk); |
523 | } | |
524 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 JW |
525 | |
526 | if (tun->flags & TUN_PERSIST) | |
527 | module_put(THIS_MODULE); | |
c8d68e6b JW |
528 | } |
529 | ||
849c9b6f | 530 | static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filter) |
a7385ba2 | 531 | { |
631ab46b | 532 | struct tun_file *tfile = file->private_data; |
38231b7a | 533 | int err; |
a7385ba2 | 534 | |
5dbbaf2d PM |
535 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
536 | if (err < 0) | |
537 | goto out; | |
538 | ||
38231b7a | 539 | err = -EINVAL; |
9e85722d | 540 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
541 | goto out; |
542 | ||
543 | err = -EBUSY; | |
c8d68e6b JW |
544 | if (!(tun->flags & TUN_TAP_MQ) && tun->numqueues == 1) |
545 | goto out; | |
546 | ||
547 | err = -E2BIG; | |
4008e97f JW |
548 | if (!tfile->detached && |
549 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
550 | goto out; |
551 | ||
552 | err = 0; | |
54f968d6 | 553 | |
92d4ea6e | 554 | /* Re-attach the filter to persist device */ |
849c9b6f | 555 | if (!skip_filter && (tun->filter_attached == true)) { |
54f968d6 JW |
556 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
557 | if (!err) | |
558 | goto out; | |
559 | } | |
c8d68e6b | 560 | tfile->queue_index = tun->numqueues; |
6e914fc7 | 561 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 562 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 563 | tun->numqueues++; |
a7385ba2 | 564 | |
4008e97f JW |
565 | if (tfile->detached) |
566 | tun_enable_queue(tfile); | |
567 | else | |
568 | sock_hold(&tfile->sk); | |
569 | ||
c8d68e6b | 570 | tun_set_real_num_queues(tun); |
a7385ba2 | 571 | |
c8d68e6b JW |
572 | /* device is allowed to go away first, so no need to hold extra |
573 | * refcnt. | |
574 | */ | |
575 | ||
576 | out: | |
577 | return err; | |
631ab46b EB |
578 | } |
579 | ||
580 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
581 | { | |
6e914fc7 | 582 | struct tun_struct *tun; |
c70f1829 | 583 | |
6e914fc7 JW |
584 | rcu_read_lock(); |
585 | tun = rcu_dereference(tfile->tun); | |
586 | if (tun) | |
587 | dev_hold(tun->dev); | |
588 | rcu_read_unlock(); | |
c70f1829 EB |
589 | |
590 | return tun; | |
631ab46b EB |
591 | } |
592 | ||
593 | static struct tun_struct *tun_get(struct file *file) | |
594 | { | |
595 | return __tun_get(file->private_data); | |
596 | } | |
597 | ||
598 | static void tun_put(struct tun_struct *tun) | |
599 | { | |
6e914fc7 | 600 | dev_put(tun->dev); |
631ab46b EB |
601 | } |
602 | ||
6b8a66ee | 603 | /* TAP filtering */ |
f271b2cc MK |
604 | static void addr_hash_set(u32 *mask, const u8 *addr) |
605 | { | |
606 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
607 | mask[n >> 5] |= (1 << (n & 31)); | |
608 | } | |
609 | ||
610 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
611 | { | |
612 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
613 | return mask[n >> 5] & (1 << (n & 31)); | |
614 | } | |
615 | ||
616 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
617 | { | |
618 | struct { u8 u[ETH_ALEN]; } *addr; | |
619 | struct tun_filter uf; | |
620 | int err, alen, n, nexact; | |
621 | ||
622 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
623 | return -EFAULT; | |
624 | ||
625 | if (!uf.count) { | |
626 | /* Disabled */ | |
627 | filter->count = 0; | |
628 | return 0; | |
629 | } | |
630 | ||
631 | alen = ETH_ALEN * uf.count; | |
632 | addr = kmalloc(alen, GFP_KERNEL); | |
633 | if (!addr) | |
634 | return -ENOMEM; | |
635 | ||
636 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
637 | err = -EFAULT; | |
638 | goto done; | |
639 | } | |
640 | ||
641 | /* The filter is updated without holding any locks. Which is | |
642 | * perfectly safe. We disable it first and in the worst | |
643 | * case we'll accept a few undesired packets. */ | |
644 | filter->count = 0; | |
645 | wmb(); | |
646 | ||
647 | /* Use first set of addresses as an exact filter */ | |
648 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
649 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
650 | ||
651 | nexact = n; | |
652 | ||
cfbf84fc AW |
653 | /* Remaining multicast addresses are hashed, |
654 | * unicast will leave the filter disabled. */ | |
f271b2cc | 655 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
656 | for (; n < uf.count; n++) { |
657 | if (!is_multicast_ether_addr(addr[n].u)) { | |
658 | err = 0; /* no filter */ | |
659 | goto done; | |
660 | } | |
f271b2cc | 661 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 662 | } |
f271b2cc MK |
663 | |
664 | /* For ALLMULTI just set the mask to all ones. | |
665 | * This overrides the mask populated above. */ | |
666 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
667 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
668 | ||
669 | /* Now enable the filter */ | |
670 | wmb(); | |
671 | filter->count = nexact; | |
672 | ||
673 | /* Return the number of exact filters */ | |
674 | err = nexact; | |
675 | ||
676 | done: | |
677 | kfree(addr); | |
678 | return err; | |
679 | } | |
680 | ||
681 | /* Returns: 0 - drop, !=0 - accept */ | |
682 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
683 | { | |
684 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
685 | * at this point. */ | |
686 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
687 | int i; | |
688 | ||
689 | /* Exact match */ | |
690 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 691 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
692 | return 1; |
693 | ||
694 | /* Inexact match (multicast only) */ | |
695 | if (is_multicast_ether_addr(eh->h_dest)) | |
696 | return addr_hash_test(filter->mask, eh->h_dest); | |
697 | ||
698 | return 0; | |
699 | } | |
700 | ||
701 | /* | |
702 | * Checks whether the packet is accepted or not. | |
703 | * Returns: 0 - drop, !=0 - accept | |
704 | */ | |
705 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
706 | { | |
707 | if (!filter->count) | |
708 | return 1; | |
709 | ||
710 | return run_filter(filter, skb); | |
711 | } | |
712 | ||
1da177e4 LT |
713 | /* Network device part of the driver */ |
714 | ||
7282d491 | 715 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 716 | |
c70f1829 EB |
717 | /* Net device detach from fd. */ |
718 | static void tun_net_uninit(struct net_device *dev) | |
719 | { | |
c8d68e6b | 720 | tun_detach_all(dev); |
c70f1829 EB |
721 | } |
722 | ||
1da177e4 LT |
723 | /* Net device open. */ |
724 | static int tun_net_open(struct net_device *dev) | |
725 | { | |
c8d68e6b | 726 | netif_tx_start_all_queues(dev); |
1da177e4 LT |
727 | return 0; |
728 | } | |
729 | ||
730 | /* Net device close. */ | |
731 | static int tun_net_close(struct net_device *dev) | |
732 | { | |
c8d68e6b | 733 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
734 | return 0; |
735 | } | |
736 | ||
737 | /* Net device start xmit */ | |
424efe9c | 738 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
739 | { |
740 | struct tun_struct *tun = netdev_priv(dev); | |
c8d68e6b | 741 | int txq = skb->queue_mapping; |
6e914fc7 | 742 | struct tun_file *tfile; |
fa35864e | 743 | u32 numqueues = 0; |
1da177e4 | 744 | |
6e914fc7 | 745 | rcu_read_lock(); |
c8d68e6b | 746 | tfile = rcu_dereference(tun->tfiles[txq]); |
fa35864e | 747 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 748 | |
1da177e4 | 749 | /* Drop packet if interface is not attached */ |
fa35864e | 750 | if (txq >= numqueues) |
1da177e4 LT |
751 | goto drop; |
752 | ||
fa35864e | 753 | if (numqueues == 1) { |
9bc88939 TH |
754 | /* Select queue was not called for the skbuff, so we extract the |
755 | * RPS hash and save it into the flow_table here. | |
756 | */ | |
757 | __u32 rxhash; | |
758 | ||
759 | rxhash = skb_get_hash(skb); | |
760 | if (rxhash) { | |
761 | struct tun_flow_entry *e; | |
762 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], | |
763 | rxhash); | |
764 | if (e) | |
765 | tun_flow_save_rps_rxhash(e, rxhash); | |
766 | } | |
767 | } | |
768 | ||
6e914fc7 JW |
769 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
770 | ||
c8d68e6b JW |
771 | BUG_ON(!tfile); |
772 | ||
f271b2cc MK |
773 | /* Drop if the filter does not like it. |
774 | * This is a noop if the filter is disabled. | |
775 | * Filter can be enabled only for the TAP devices. */ | |
776 | if (!check_filter(&tun->txflt, skb)) | |
777 | goto drop; | |
778 | ||
54f968d6 JW |
779 | if (tfile->socket.sk->sk_filter && |
780 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
781 | goto drop; |
782 | ||
36fe8c09 | 783 | /* Limit the number of packets queued by dividing txq length with the |
c8d68e6b JW |
784 | * number of queues. |
785 | */ | |
fa35864e DC |
786 | if (skb_queue_len(&tfile->socket.sk->sk_receive_queue) * numqueues |
787 | >= dev->tx_queue_len) | |
5d097109 | 788 | goto drop; |
1da177e4 | 789 | |
7bf66305 JW |
790 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
791 | goto drop; | |
792 | ||
eda29772 RC |
793 | if (skb->sk) { |
794 | sock_tx_timestamp(skb->sk, &skb_shinfo(skb)->tx_flags); | |
795 | sw_tx_timestamp(skb); | |
796 | } | |
797 | ||
0110d6f2 | 798 | /* Orphan the skb - required as we might hang on to it |
7bf66305 JW |
799 | * for indefinite time. |
800 | */ | |
0110d6f2 MT |
801 | skb_orphan(skb); |
802 | ||
f8af75f3 ED |
803 | nf_reset(skb); |
804 | ||
f271b2cc | 805 | /* Enqueue packet */ |
54f968d6 | 806 | skb_queue_tail(&tfile->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
807 | |
808 | /* Notify and wake up reader process */ | |
54f968d6 JW |
809 | if (tfile->flags & TUN_FASYNC) |
810 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
9e641bdc | 811 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
6e914fc7 JW |
812 | |
813 | rcu_read_unlock(); | |
6ed10654 | 814 | return NETDEV_TX_OK; |
1da177e4 LT |
815 | |
816 | drop: | |
09f75cd7 | 817 | dev->stats.tx_dropped++; |
149d36f7 | 818 | skb_tx_error(skb); |
1da177e4 | 819 | kfree_skb(skb); |
6e914fc7 | 820 | rcu_read_unlock(); |
6ed10654 | 821 | return NETDEV_TX_OK; |
1da177e4 LT |
822 | } |
823 | ||
f271b2cc | 824 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 825 | { |
f271b2cc MK |
826 | /* |
827 | * This callback is supposed to deal with mc filter in | |
828 | * _rx_ path and has nothing to do with the _tx_ path. | |
829 | * In rx path we always accept everything userspace gives us. | |
830 | */ | |
1da177e4 LT |
831 | } |
832 | ||
4885a504 ES |
833 | #define MIN_MTU 68 |
834 | #define MAX_MTU 65535 | |
835 | ||
836 | static int | |
837 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
838 | { | |
839 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
840 | return -EINVAL; | |
841 | dev->mtu = new_mtu; | |
842 | return 0; | |
843 | } | |
844 | ||
c8f44aff MM |
845 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
846 | netdev_features_t features) | |
88255375 MM |
847 | { |
848 | struct tun_struct *tun = netdev_priv(dev); | |
849 | ||
850 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
851 | } | |
bebd097a NH |
852 | #ifdef CONFIG_NET_POLL_CONTROLLER |
853 | static void tun_poll_controller(struct net_device *dev) | |
854 | { | |
855 | /* | |
856 | * Tun only receives frames when: | |
857 | * 1) the char device endpoint gets data from user space | |
858 | * 2) the tun socket gets a sendmsg call from user space | |
92d4ea6e | 859 | * Since both of those are synchronous operations, we are guaranteed |
bebd097a | 860 | * never to have pending data when we poll for it |
92d4ea6e | 861 | * so there is nothing to do here but return. |
bebd097a NH |
862 | * We need this though so netpoll recognizes us as an interface that |
863 | * supports polling, which enables bridge devices in virt setups to | |
864 | * still use netconsole | |
865 | */ | |
866 | return; | |
867 | } | |
868 | #endif | |
758e43b7 | 869 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 870 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
871 | .ndo_open = tun_net_open, |
872 | .ndo_stop = tun_net_close, | |
00829823 | 873 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 874 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 875 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 876 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
877 | #ifdef CONFIG_NET_POLL_CONTROLLER |
878 | .ndo_poll_controller = tun_poll_controller, | |
879 | #endif | |
758e43b7 SH |
880 | }; |
881 | ||
882 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 883 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
884 | .ndo_open = tun_net_open, |
885 | .ndo_stop = tun_net_close, | |
00829823 | 886 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 887 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 888 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 889 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
890 | .ndo_set_mac_address = eth_mac_addr, |
891 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 892 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
893 | #ifdef CONFIG_NET_POLL_CONTROLLER |
894 | .ndo_poll_controller = tun_poll_controller, | |
895 | #endif | |
758e43b7 SH |
896 | }; |
897 | ||
944a1376 | 898 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
899 | { |
900 | int i; | |
901 | ||
96442e42 JW |
902 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
903 | INIT_HLIST_HEAD(&tun->flows[i]); | |
904 | ||
905 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
906 | setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); | |
907 | mod_timer(&tun->flow_gc_timer, | |
908 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
909 | } |
910 | ||
911 | static void tun_flow_uninit(struct tun_struct *tun) | |
912 | { | |
913 | del_timer_sync(&tun->flow_gc_timer); | |
914 | tun_flow_flush(tun); | |
96442e42 JW |
915 | } |
916 | ||
1da177e4 LT |
917 | /* Initialize net device. */ |
918 | static void tun_net_init(struct net_device *dev) | |
919 | { | |
920 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 921 | |
1da177e4 LT |
922 | switch (tun->flags & TUN_TYPE_MASK) { |
923 | case TUN_TUN_DEV: | |
758e43b7 SH |
924 | dev->netdev_ops = &tun_netdev_ops; |
925 | ||
1da177e4 LT |
926 | /* Point-to-Point TUN Device */ |
927 | dev->hard_header_len = 0; | |
928 | dev->addr_len = 0; | |
929 | dev->mtu = 1500; | |
930 | ||
931 | /* Zero header length */ | |
6aa20a22 | 932 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
933 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
934 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
935 | break; | |
936 | ||
937 | case TUN_TAP_DEV: | |
7a0a9608 | 938 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 939 | /* Ethernet TAP Device */ |
1da177e4 | 940 | ether_setup(dev); |
550fd08c | 941 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 942 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 943 | |
f2cedb63 | 944 | eth_hw_addr_random(dev); |
36226a8d | 945 | |
1da177e4 LT |
946 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
947 | break; | |
948 | } | |
949 | } | |
950 | ||
951 | /* Character device part */ | |
952 | ||
953 | /* Poll */ | |
c8d68e6b | 954 | static unsigned int tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 955 | { |
b2430de3 EB |
956 | struct tun_file *tfile = file->private_data; |
957 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 958 | struct sock *sk; |
33dccbb0 | 959 | unsigned int mask = 0; |
1da177e4 LT |
960 | |
961 | if (!tun) | |
eac9e902 | 962 | return POLLERR; |
1da177e4 | 963 | |
54f968d6 | 964 | sk = tfile->socket.sk; |
3c8a9c63 | 965 | |
6b8a66ee | 966 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 967 | |
9e641bdc | 968 | poll_wait(file, sk_sleep(sk), wait); |
6aa20a22 | 969 | |
89f56d1e | 970 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
971 | mask |= POLLIN | POLLRDNORM; |
972 | ||
33dccbb0 HX |
973 | if (sock_writeable(sk) || |
974 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
975 | sock_writeable(sk))) | |
976 | mask |= POLLOUT | POLLWRNORM; | |
977 | ||
c70f1829 EB |
978 | if (tun->dev->reg_state != NETREG_REGISTERED) |
979 | mask = POLLERR; | |
980 | ||
631ab46b | 981 | tun_put(tun); |
1da177e4 LT |
982 | return mask; |
983 | } | |
984 | ||
f42157cb RR |
985 | /* prepad is the amount to reserve at front. len is length after that. |
986 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 987 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 988 | size_t prepad, size_t len, |
989 | size_t linear, int noblock) | |
f42157cb | 990 | { |
54f968d6 | 991 | struct sock *sk = tfile->socket.sk; |
f42157cb | 992 | struct sk_buff *skb; |
33dccbb0 | 993 | int err; |
f42157cb RR |
994 | |
995 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 996 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 997 | linear = len; |
f42157cb | 998 | |
33dccbb0 | 999 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
28d64271 | 1000 | &err, 0); |
f42157cb | 1001 | if (!skb) |
33dccbb0 | 1002 | return ERR_PTR(err); |
f42157cb RR |
1003 | |
1004 | skb_reserve(skb, prepad); | |
1005 | skb_put(skb, linear); | |
33dccbb0 HX |
1006 | skb->data_len = len - linear; |
1007 | skb->len += len - linear; | |
f42157cb RR |
1008 | |
1009 | return skb; | |
1010 | } | |
1011 | ||
1da177e4 | 1012 | /* Get packet from user space buffer */ |
54f968d6 JW |
1013 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
1014 | void *msg_control, const struct iovec *iv, | |
1015 | size_t total_len, size_t count, int noblock) | |
1da177e4 | 1016 | { |
09640e63 | 1017 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1018 | struct sk_buff *skb; |
3dd5c330 | 1019 | size_t len = total_len, align = NET_SKB_PAD, linear; |
f43798c2 | 1020 | struct virtio_net_hdr gso = { 0 }; |
96f8d9ec | 1021 | int good_linear; |
6f26c9a7 | 1022 | int offset = 0; |
0690899b MT |
1023 | int copylen; |
1024 | bool zerocopy = false; | |
1025 | int err; | |
49974420 | 1026 | u32 rxhash; |
1da177e4 LT |
1027 | |
1028 | if (!(tun->flags & TUN_NO_PI)) { | |
15718ea0 | 1029 | if (len < sizeof(pi)) |
1da177e4 | 1030 | return -EINVAL; |
15718ea0 | 1031 | len -= sizeof(pi); |
1da177e4 | 1032 | |
6f26c9a7 | 1033 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 1034 | return -EFAULT; |
6f26c9a7 | 1035 | offset += sizeof(pi); |
1da177e4 LT |
1036 | } |
1037 | ||
f43798c2 | 1038 | if (tun->flags & TUN_VNET_HDR) { |
15718ea0 | 1039 | if (len < tun->vnet_hdr_sz) |
f43798c2 | 1040 | return -EINVAL; |
15718ea0 | 1041 | len -= tun->vnet_hdr_sz; |
f43798c2 | 1042 | |
6f26c9a7 | 1043 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
1044 | return -EFAULT; |
1045 | ||
4909122f HX |
1046 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
1047 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
1048 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
1049 | ||
f43798c2 RR |
1050 | if (gso.hdr_len > len) |
1051 | return -EINVAL; | |
d9d52b51 | 1052 | offset += tun->vnet_hdr_sz; |
f43798c2 RR |
1053 | } |
1054 | ||
e01bf1c8 | 1055 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
a504b86e | 1056 | align += NET_IP_ALIGN; |
0eca93bc HX |
1057 | if (unlikely(len < ETH_HLEN || |
1058 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
1059 | return -EINVAL; |
1060 | } | |
6aa20a22 | 1061 | |
96f8d9ec JW |
1062 | good_linear = SKB_MAX_HEAD(align); |
1063 | ||
88529176 JW |
1064 | if (msg_control) { |
1065 | /* There are 256 bytes to be copied in skb, so there is | |
1066 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1067 | * The rest of the buffer is mapped from userspace. |
1068 | */ | |
88529176 | 1069 | copylen = gso.hdr_len ? gso.hdr_len : GOODCOPY_LEN; |
96f8d9ec JW |
1070 | if (copylen > good_linear) |
1071 | copylen = good_linear; | |
3dd5c330 | 1072 | linear = copylen; |
88529176 JW |
1073 | if (iov_pages(iv, offset + copylen, count) <= MAX_SKB_FRAGS) |
1074 | zerocopy = true; | |
1075 | } | |
1076 | ||
1077 | if (!zerocopy) { | |
0690899b | 1078 | copylen = len; |
96f8d9ec JW |
1079 | if (gso.hdr_len > good_linear) |
1080 | linear = good_linear; | |
1081 | else | |
1082 | linear = gso.hdr_len; | |
3dd5c330 | 1083 | } |
0690899b | 1084 | |
3dd5c330 | 1085 | skb = tun_alloc_skb(tfile, align, copylen, linear, noblock); |
33dccbb0 HX |
1086 | if (IS_ERR(skb)) { |
1087 | if (PTR_ERR(skb) != -EAGAIN) | |
1088 | tun->dev->stats.rx_dropped++; | |
1089 | return PTR_ERR(skb); | |
1da177e4 LT |
1090 | } |
1091 | ||
0690899b MT |
1092 | if (zerocopy) |
1093 | err = zerocopy_sg_from_iovec(skb, iv, offset, count); | |
88529176 | 1094 | else { |
0690899b | 1095 | err = skb_copy_datagram_from_iovec(skb, 0, iv, offset, len); |
88529176 JW |
1096 | if (!err && msg_control) { |
1097 | struct ubuf_info *uarg = msg_control; | |
1098 | uarg->callback(uarg, false); | |
1099 | } | |
1100 | } | |
0690899b MT |
1101 | |
1102 | if (err) { | |
09f75cd7 | 1103 | tun->dev->stats.rx_dropped++; |
8f22757e | 1104 | kfree_skb(skb); |
1da177e4 | 1105 | return -EFAULT; |
8f22757e | 1106 | } |
1da177e4 | 1107 | |
f43798c2 RR |
1108 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
1109 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
1110 | gso.csum_offset)) { | |
1111 | tun->dev->stats.rx_frame_errors++; | |
1112 | kfree_skb(skb); | |
1113 | return -EINVAL; | |
1114 | } | |
88255375 | 1115 | } |
f43798c2 | 1116 | |
1da177e4 LT |
1117 | switch (tun->flags & TUN_TYPE_MASK) { |
1118 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
1119 | if (tun->flags & TUN_NO_PI) { |
1120 | switch (skb->data[0] & 0xf0) { | |
1121 | case 0x40: | |
1122 | pi.proto = htons(ETH_P_IP); | |
1123 | break; | |
1124 | case 0x60: | |
1125 | pi.proto = htons(ETH_P_IPV6); | |
1126 | break; | |
1127 | default: | |
1128 | tun->dev->stats.rx_dropped++; | |
1129 | kfree_skb(skb); | |
1130 | return -EINVAL; | |
1131 | } | |
1132 | } | |
1133 | ||
459a98ed | 1134 | skb_reset_mac_header(skb); |
1da177e4 | 1135 | skb->protocol = pi.proto; |
4c13eb66 | 1136 | skb->dev = tun->dev; |
1da177e4 LT |
1137 | break; |
1138 | case TUN_TAP_DEV: | |
1139 | skb->protocol = eth_type_trans(skb, tun->dev); | |
1140 | break; | |
6403eab1 | 1141 | } |
1da177e4 | 1142 | |
5188cd44 BH |
1143 | skb_reset_network_header(skb); |
1144 | ||
f43798c2 RR |
1145 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
1146 | pr_debug("GSO!\n"); | |
1147 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1148 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
c9af6db4 | 1149 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
f43798c2 RR |
1150 | break; |
1151 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
c9af6db4 | 1152 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
f43798c2 | 1153 | break; |
e36aa25a | 1154 | case VIRTIO_NET_HDR_GSO_UDP: |
3d0ad094 BH |
1155 | { |
1156 | static bool warned; | |
1157 | ||
1158 | if (!warned) { | |
1159 | warned = true; | |
1160 | netdev_warn(tun->dev, | |
1161 | "%s: using disabled UFO feature; please fix this program\n", | |
1162 | current->comm); | |
1163 | } | |
c9af6db4 | 1164 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
5188cd44 BH |
1165 | if (skb->protocol == htons(ETH_P_IPV6)) |
1166 | ipv6_proxy_select_ident(skb); | |
e36aa25a | 1167 | break; |
3d0ad094 | 1168 | } |
f43798c2 RR |
1169 | default: |
1170 | tun->dev->stats.rx_frame_errors++; | |
1171 | kfree_skb(skb); | |
1172 | return -EINVAL; | |
1173 | } | |
1174 | ||
1175 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
c9af6db4 | 1176 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
f43798c2 RR |
1177 | |
1178 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
1179 | if (skb_shinfo(skb)->gso_size == 0) { | |
1180 | tun->dev->stats.rx_frame_errors++; | |
1181 | kfree_skb(skb); | |
1182 | return -EINVAL; | |
1183 | } | |
1184 | ||
1185 | /* Header must be checked, and gso_segs computed. */ | |
1186 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1187 | skb_shinfo(skb)->gso_segs = 0; | |
1188 | } | |
6aa20a22 | 1189 | |
0690899b MT |
1190 | /* copy skb_ubuf_info for callback when skb has no error */ |
1191 | if (zerocopy) { | |
1192 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1193 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
c9af6db4 | 1194 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
0690899b MT |
1195 | } |
1196 | ||
40893fd0 | 1197 | skb_probe_transport_header(skb, 0); |
38502af7 | 1198 | |
3958afa1 | 1199 | rxhash = skb_get_hash(skb); |
1da177e4 | 1200 | netif_rx_ni(skb); |
6aa20a22 | 1201 | |
09f75cd7 JG |
1202 | tun->dev->stats.rx_packets++; |
1203 | tun->dev->stats.rx_bytes += len; | |
1da177e4 | 1204 | |
9e85722d | 1205 | tun_flow_update(tun, rxhash, tfile); |
0690899b | 1206 | return total_len; |
6aa20a22 | 1207 | } |
1da177e4 | 1208 | |
ee0b3e67 BP |
1209 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
1210 | unsigned long count, loff_t pos) | |
1da177e4 | 1211 | { |
33dccbb0 | 1212 | struct file *file = iocb->ki_filp; |
ab46d779 | 1213 | struct tun_struct *tun = tun_get(file); |
54f968d6 | 1214 | struct tun_file *tfile = file->private_data; |
631ab46b | 1215 | ssize_t result; |
1da177e4 LT |
1216 | |
1217 | if (!tun) | |
1218 | return -EBADFD; | |
1219 | ||
6b8a66ee | 1220 | tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count); |
1da177e4 | 1221 | |
54f968d6 JW |
1222 | result = tun_get_user(tun, tfile, NULL, iv, iov_length(iv, count), |
1223 | count, file->f_flags & O_NONBLOCK); | |
631ab46b EB |
1224 | |
1225 | tun_put(tun); | |
1226 | return result; | |
1da177e4 LT |
1227 | } |
1228 | ||
1da177e4 | 1229 | /* Put packet to the user space buffer */ |
6f7c156c | 1230 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 1231 | struct tun_file *tfile, |
6f7c156c | 1232 | struct sk_buff *skb, |
1233 | const struct iovec *iv, int len) | |
1da177e4 LT |
1234 | { |
1235 | struct tun_pi pi = { 0, skb->protocol }; | |
1236 | ssize_t total = 0; | |
e6fd07c8 | 1237 | int vlan_offset = 0, copied; |
a8f9bfdf HX |
1238 | int vlan_hlen = 0; |
1239 | ||
1240 | if (vlan_tx_tag_present(skb)) | |
1241 | vlan_hlen = VLAN_HLEN; | |
1da177e4 LT |
1242 | |
1243 | if (!(tun->flags & TUN_NO_PI)) { | |
1244 | if ((len -= sizeof(pi)) < 0) | |
1245 | return -EINVAL; | |
1246 | ||
1247 | if (len < skb->len) { | |
1248 | /* Packet will be striped */ | |
1249 | pi.flags |= TUN_PKT_STRIP; | |
1250 | } | |
6aa20a22 | 1251 | |
43b39dcd | 1252 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
1253 | return -EFAULT; |
1254 | total += sizeof(pi); | |
6aa20a22 | 1255 | } |
1da177e4 | 1256 | |
f43798c2 RR |
1257 | if (tun->flags & TUN_VNET_HDR) { |
1258 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
d9d52b51 | 1259 | if ((len -= tun->vnet_hdr_sz) < 0) |
f43798c2 RR |
1260 | return -EINVAL; |
1261 | ||
1262 | if (skb_is_gso(skb)) { | |
1263 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1264 | ||
1265 | /* This is a hint as to how much should be linear. */ | |
1266 | gso.hdr_len = skb_headlen(skb); | |
1267 | gso.gso_size = sinfo->gso_size; | |
1268 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1269 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1270 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1271 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
ef3db4a5 | 1272 | else { |
6b8a66ee | 1273 | pr_err("unexpected GSO type: " |
ef3db4a5 MT |
1274 | "0x%x, gso_size %d, hdr_len %d\n", |
1275 | sinfo->gso_type, gso.gso_size, | |
1276 | gso.hdr_len); | |
1277 | print_hex_dump(KERN_ERR, "tun: ", | |
1278 | DUMP_PREFIX_NONE, | |
1279 | 16, 1, skb->head, | |
1280 | min((int)gso.hdr_len, 64), true); | |
1281 | WARN_ON_ONCE(1); | |
1282 | return -EINVAL; | |
1283 | } | |
f43798c2 RR |
1284 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
1285 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1286 | } else | |
1287 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1288 | ||
1289 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1290 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
a8f9bfdf HX |
1291 | gso.csum_start = skb_checksum_start_offset(skb) + |
1292 | vlan_hlen; | |
f43798c2 | 1293 | gso.csum_offset = skb->csum_offset; |
10a8d94a JW |
1294 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
1295 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
f43798c2 RR |
1296 | } /* else everything is zero */ |
1297 | ||
43b39dcd MT |
1298 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
1299 | sizeof(gso)))) | |
f43798c2 | 1300 | return -EFAULT; |
d9d52b51 | 1301 | total += tun->vnet_hdr_sz; |
f43798c2 RR |
1302 | } |
1303 | ||
e6fd07c8 | 1304 | copied = total; |
a8f9bfdf HX |
1305 | len = min_t(int, skb->len + vlan_hlen, len); |
1306 | total += skb->len + vlan_hlen; | |
1307 | if (vlan_hlen) { | |
6680ec68 JW |
1308 | int copy, ret; |
1309 | struct { | |
1310 | __be16 h_vlan_proto; | |
1311 | __be16 h_vlan_TCI; | |
1312 | } veth; | |
1313 | ||
1314 | veth.h_vlan_proto = skb->vlan_proto; | |
1315 | veth.h_vlan_TCI = htons(vlan_tx_tag_get(skb)); | |
1316 | ||
1317 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
6680ec68 JW |
1318 | |
1319 | copy = min_t(int, vlan_offset, len); | |
e6fd07c8 | 1320 | ret = skb_copy_datagram_const_iovec(skb, 0, iv, copied, copy); |
6680ec68 | 1321 | len -= copy; |
e6fd07c8 | 1322 | copied += copy; |
6680ec68 JW |
1323 | if (ret || !len) |
1324 | goto done; | |
1325 | ||
1326 | copy = min_t(int, sizeof(veth), len); | |
e6fd07c8 | 1327 | ret = memcpy_toiovecend(iv, (void *)&veth, copied, copy); |
6680ec68 | 1328 | len -= copy; |
e6fd07c8 | 1329 | copied += copy; |
6680ec68 JW |
1330 | if (ret || !len) |
1331 | goto done; | |
1332 | } | |
1da177e4 | 1333 | |
e6fd07c8 | 1334 | skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len); |
1da177e4 | 1335 | |
6680ec68 | 1336 | done: |
09f75cd7 JG |
1337 | tun->dev->stats.tx_packets++; |
1338 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
1339 | |
1340 | return total; | |
1341 | } | |
1342 | ||
54f968d6 | 1343 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
f96eb74c | 1344 | const struct iovec *iv, ssize_t len, int noblock) |
1da177e4 | 1345 | { |
1da177e4 | 1346 | struct sk_buff *skb; |
05c2828c | 1347 | ssize_t ret = 0; |
9e641bdc | 1348 | int peeked, err, off = 0; |
1da177e4 | 1349 | |
3872baf6 | 1350 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 1351 | |
9e641bdc XW |
1352 | if (!len) |
1353 | return ret; | |
1da177e4 | 1354 | |
9e641bdc XW |
1355 | if (tun->dev->reg_state != NETREG_REGISTERED) |
1356 | return -EIO; | |
1da177e4 | 1357 | |
9e641bdc XW |
1358 | /* Read frames from queue */ |
1359 | skb = __skb_recv_datagram(tfile->socket.sk, noblock ? MSG_DONTWAIT : 0, | |
1360 | &peeked, &off, &err); | |
1361 | if (skb) { | |
54f968d6 | 1362 | ret = tun_put_user(tun, tfile, skb, iv, len); |
f271b2cc | 1363 | kfree_skb(skb); |
9e641bdc XW |
1364 | } else |
1365 | ret = err; | |
1da177e4 | 1366 | |
05c2828c MT |
1367 | return ret; |
1368 | } | |
1369 | ||
1370 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
1371 | unsigned long count, loff_t pos) | |
1372 | { | |
1373 | struct file *file = iocb->ki_filp; | |
1374 | struct tun_file *tfile = file->private_data; | |
1375 | struct tun_struct *tun = __tun_get(tfile); | |
1376 | ssize_t len, ret; | |
1377 | ||
1378 | if (!tun) | |
1379 | return -EBADFD; | |
1380 | len = iov_length(iv, count); | |
1381 | if (len < 0) { | |
1382 | ret = -EINVAL; | |
1383 | goto out; | |
1384 | } | |
1385 | ||
f96eb74c | 1386 | ret = tun_do_read(tun, tfile, iv, len, |
54f968d6 | 1387 | 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 EB |
1391 | out: |
1392 | tun_put(tun); | |
1da177e4 LT |
1393 | return ret; |
1394 | } | |
1395 | ||
96442e42 JW |
1396 | static void tun_free_netdev(struct net_device *dev) |
1397 | { | |
1398 | struct tun_struct *tun = netdev_priv(dev); | |
1399 | ||
4008e97f | 1400 | BUG_ON(!(list_empty(&tun->disabled))); |
96442e42 | 1401 | tun_flow_uninit(tun); |
5dbbaf2d | 1402 | security_tun_dev_free_security(tun->security); |
96442e42 JW |
1403 | free_netdev(dev); |
1404 | } | |
1405 | ||
1da177e4 LT |
1406 | static void tun_setup(struct net_device *dev) |
1407 | { | |
1408 | struct tun_struct *tun = netdev_priv(dev); | |
1409 | ||
0625c883 EB |
1410 | tun->owner = INVALID_UID; |
1411 | tun->group = INVALID_GID; | |
1da177e4 | 1412 | |
1da177e4 | 1413 | dev->ethtool_ops = &tun_ethtool_ops; |
96442e42 | 1414 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
1415 | } |
1416 | ||
f019a7a5 EB |
1417 | /* Trivial set of netlink ops to allow deleting tun or tap |
1418 | * device with netlink. | |
1419 | */ | |
1420 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1421 | { | |
1422 | return -EINVAL; | |
1423 | } | |
1424 | ||
1425 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1426 | .kind = DRV_NAME, | |
1427 | .priv_size = sizeof(struct tun_struct), | |
1428 | .setup = tun_setup, | |
1429 | .validate = tun_validate, | |
1430 | }; | |
1431 | ||
33dccbb0 HX |
1432 | static void tun_sock_write_space(struct sock *sk) |
1433 | { | |
54f968d6 | 1434 | struct tun_file *tfile; |
43815482 | 1435 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1436 | |
1437 | if (!sock_writeable(sk)) | |
1438 | return; | |
1439 | ||
33dccbb0 HX |
1440 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
1441 | return; | |
1442 | ||
43815482 ED |
1443 | wqueue = sk_sleep(sk); |
1444 | if (wqueue && waitqueue_active(wqueue)) | |
1445 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1446 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1447 | |
54f968d6 JW |
1448 | tfile = container_of(sk, struct tun_file, sk); |
1449 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
1450 | } |
1451 | ||
05c2828c MT |
1452 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
1453 | struct msghdr *m, size_t total_len) | |
1454 | { | |
54f968d6 JW |
1455 | int ret; |
1456 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1457 | struct tun_struct *tun = __tun_get(tfile); | |
1458 | ||
1459 | if (!tun) | |
1460 | return -EBADFD; | |
54f968d6 JW |
1461 | ret = tun_get_user(tun, tfile, m->msg_control, m->msg_iov, total_len, |
1462 | m->msg_iovlen, m->msg_flags & MSG_DONTWAIT); | |
1463 | tun_put(tun); | |
1464 | return ret; | |
05c2828c MT |
1465 | } |
1466 | ||
1467 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1468 | struct msghdr *m, size_t total_len, | |
1469 | int flags) | |
1470 | { | |
54f968d6 JW |
1471 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
1472 | struct tun_struct *tun = __tun_get(tfile); | |
05c2828c | 1473 | int ret; |
54f968d6 JW |
1474 | |
1475 | if (!tun) | |
1476 | return -EBADFD; | |
1477 | ||
eda29772 | 1478 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
3811ae76 G |
1479 | ret = -EINVAL; |
1480 | goto out; | |
1481 | } | |
eda29772 RC |
1482 | if (flags & MSG_ERRQUEUE) { |
1483 | ret = sock_recv_errqueue(sock->sk, m, total_len, | |
1484 | SOL_PACKET, TUN_TX_TIMESTAMP); | |
1485 | goto out; | |
1486 | } | |
f96eb74c | 1487 | ret = tun_do_read(tun, tfile, m->msg_iov, total_len, |
05c2828c | 1488 | flags & MSG_DONTWAIT); |
42404c09 DM |
1489 | if (ret > total_len) { |
1490 | m->msg_flags |= MSG_TRUNC; | |
1491 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1492 | } | |
3811ae76 | 1493 | out: |
54f968d6 | 1494 | tun_put(tun); |
05c2828c MT |
1495 | return ret; |
1496 | } | |
1497 | ||
1ab5ecb9 SK |
1498 | static int tun_release(struct socket *sock) |
1499 | { | |
1500 | if (sock->sk) | |
1501 | sock_put(sock->sk); | |
1502 | return 0; | |
1503 | } | |
1504 | ||
05c2828c MT |
1505 | /* Ops structure to mimic raw sockets with tun */ |
1506 | static const struct proto_ops tun_socket_ops = { | |
1507 | .sendmsg = tun_sendmsg, | |
1508 | .recvmsg = tun_recvmsg, | |
1ab5ecb9 | 1509 | .release = tun_release, |
05c2828c MT |
1510 | }; |
1511 | ||
33dccbb0 HX |
1512 | static struct proto tun_proto = { |
1513 | .name = "tun", | |
1514 | .owner = THIS_MODULE, | |
54f968d6 | 1515 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 1516 | }; |
f019a7a5 | 1517 | |
980c9e8c DW |
1518 | static int tun_flags(struct tun_struct *tun) |
1519 | { | |
1520 | int flags = 0; | |
1521 | ||
1522 | if (tun->flags & TUN_TUN_DEV) | |
1523 | flags |= IFF_TUN; | |
1524 | else | |
1525 | flags |= IFF_TAP; | |
1526 | ||
1527 | if (tun->flags & TUN_NO_PI) | |
1528 | flags |= IFF_NO_PI; | |
1529 | ||
5d097109 MT |
1530 | /* This flag has no real effect. We track the value for backwards |
1531 | * compatibility. | |
1532 | */ | |
980c9e8c DW |
1533 | if (tun->flags & TUN_ONE_QUEUE) |
1534 | flags |= IFF_ONE_QUEUE; | |
1535 | ||
1536 | if (tun->flags & TUN_VNET_HDR) | |
1537 | flags |= IFF_VNET_HDR; | |
1538 | ||
c8d68e6b JW |
1539 | if (tun->flags & TUN_TAP_MQ) |
1540 | flags |= IFF_MULTI_QUEUE; | |
1541 | ||
274038f8 PE |
1542 | if (tun->flags & TUN_PERSIST) |
1543 | flags |= IFF_PERSIST; | |
1544 | ||
980c9e8c DW |
1545 | return flags; |
1546 | } | |
1547 | ||
1548 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1549 | char *buf) | |
1550 | { | |
1551 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1552 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1553 | } | |
1554 | ||
1555 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1556 | char *buf) | |
1557 | { | |
1558 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1559 | return uid_valid(tun->owner)? |
1560 | sprintf(buf, "%u\n", | |
1561 | from_kuid_munged(current_user_ns(), tun->owner)): | |
1562 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1563 | } |
1564 | ||
1565 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1566 | char *buf) | |
1567 | { | |
1568 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1569 | return gid_valid(tun->group) ? |
1570 | sprintf(buf, "%u\n", | |
1571 | from_kgid_munged(current_user_ns(), tun->group)): | |
1572 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1573 | } |
1574 | ||
1575 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1576 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1577 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1578 | ||
d647a591 | 1579 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
1580 | { |
1581 | struct tun_struct *tun; | |
54f968d6 | 1582 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
1583 | struct net_device *dev; |
1584 | int err; | |
1585 | ||
7c0c3b1a JW |
1586 | if (tfile->detached) |
1587 | return -EINVAL; | |
1588 | ||
74a3e5a7 EB |
1589 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1590 | if (dev) { | |
f85ba780 DW |
1591 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1592 | return -EBUSY; | |
74a3e5a7 EB |
1593 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1594 | tun = netdev_priv(dev); | |
1595 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1596 | tun = netdev_priv(dev); | |
1597 | else | |
1598 | return -EINVAL; | |
1599 | ||
8e6d91ae JW |
1600 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
1601 | !!(tun->flags & TUN_TAP_MQ)) | |
1602 | return -EINVAL; | |
1603 | ||
cde8b15f | 1604 | if (tun_not_capable(tun)) |
2b980dbd | 1605 | return -EPERM; |
5dbbaf2d | 1606 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
1607 | if (err < 0) |
1608 | return err; | |
1609 | ||
849c9b6f | 1610 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER); |
a7385ba2 EB |
1611 | if (err < 0) |
1612 | return err; | |
4008e97f JW |
1613 | |
1614 | if (tun->flags & TUN_TAP_MQ && | |
e8dbad66 JW |
1615 | (tun->numqueues + tun->numdisabled > 1)) { |
1616 | /* One or more queue has already been attached, no need | |
1617 | * to initialize the device again. | |
1618 | */ | |
1619 | return 0; | |
1620 | } | |
6aa20a22 | 1621 | } |
1da177e4 LT |
1622 | else { |
1623 | char *name; | |
1624 | unsigned long flags = 0; | |
edfb6a14 JW |
1625 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
1626 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 1627 | |
c260b772 | 1628 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 1629 | return -EPERM; |
2b980dbd PM |
1630 | err = security_tun_dev_create(); |
1631 | if (err < 0) | |
1632 | return err; | |
ca6bb5d7 | 1633 | |
1da177e4 LT |
1634 | /* Set dev type */ |
1635 | if (ifr->ifr_flags & IFF_TUN) { | |
1636 | /* TUN device */ | |
1637 | flags |= TUN_TUN_DEV; | |
1638 | name = "tun%d"; | |
1639 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1640 | /* TAP device */ | |
1641 | flags |= TUN_TAP_DEV; | |
1642 | name = "tap%d"; | |
6aa20a22 | 1643 | } else |
36989b90 | 1644 | return -EINVAL; |
6aa20a22 | 1645 | |
1da177e4 LT |
1646 | if (*ifr->ifr_name) |
1647 | name = ifr->ifr_name; | |
1648 | ||
c8d68e6b | 1649 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
c835a677 TG |
1650 | NET_NAME_UNKNOWN, tun_setup, queues, |
1651 | queues); | |
edfb6a14 | 1652 | |
1da177e4 LT |
1653 | if (!dev) |
1654 | return -ENOMEM; | |
1655 | ||
fc54c658 | 1656 | dev_net_set(dev, net); |
f019a7a5 | 1657 | dev->rtnl_link_ops = &tun_link_ops; |
fb7589a1 | 1658 | dev->ifindex = tfile->ifindex; |
758e43b7 | 1659 | |
1da177e4 LT |
1660 | tun = netdev_priv(dev); |
1661 | tun->dev = dev; | |
1662 | tun->flags = flags; | |
f271b2cc | 1663 | tun->txflt.count = 0; |
d9d52b51 | 1664 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 1665 | |
54f968d6 JW |
1666 | tun->filter_attached = false; |
1667 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
33dccbb0 | 1668 | |
96442e42 JW |
1669 | spin_lock_init(&tun->lock); |
1670 | ||
5dbbaf2d PM |
1671 | err = security_tun_dev_alloc_security(&tun->security); |
1672 | if (err < 0) | |
1673 | goto err_free_dev; | |
2b980dbd | 1674 | |
1da177e4 | 1675 | tun_net_init(dev); |
944a1376 | 1676 | tun_flow_init(tun); |
96442e42 | 1677 | |
88255375 | 1678 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
6680ec68 JW |
1679 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
1680 | NETIF_F_HW_VLAN_STAG_TX; | |
88255375 | 1681 | dev->features = dev->hw_features; |
6671b224 FLVC |
1682 | dev->vlan_features = dev->features & |
1683 | ~(NETIF_F_HW_VLAN_CTAG_TX | | |
1684 | NETIF_F_HW_VLAN_STAG_TX); | |
88255375 | 1685 | |
4008e97f | 1686 | INIT_LIST_HEAD(&tun->disabled); |
849c9b6f | 1687 | err = tun_attach(tun, file, false); |
eb0fb363 | 1688 | if (err < 0) |
662ca437 | 1689 | goto err_free_flow; |
eb0fb363 | 1690 | |
1da177e4 LT |
1691 | err = register_netdevice(tun->dev); |
1692 | if (err < 0) | |
662ca437 | 1693 | goto err_detach; |
9c3fea6a | 1694 | |
980c9e8c DW |
1695 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1696 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1697 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
6b8a66ee | 1698 | pr_err("Failed to create tun sysfs files\n"); |
1da177e4 LT |
1699 | } |
1700 | ||
af668b3c MT |
1701 | netif_carrier_on(tun->dev); |
1702 | ||
6b8a66ee | 1703 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 LT |
1704 | |
1705 | if (ifr->ifr_flags & IFF_NO_PI) | |
1706 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1707 | else |
1708 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 | 1709 | |
5d097109 MT |
1710 | /* This flag has no real effect. We track the value for backwards |
1711 | * compatibility. | |
1712 | */ | |
1da177e4 LT |
1713 | if (ifr->ifr_flags & IFF_ONE_QUEUE) |
1714 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1715 | else |
1716 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1717 | |
f43798c2 RR |
1718 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1719 | tun->flags |= TUN_VNET_HDR; | |
1720 | else | |
1721 | tun->flags &= ~TUN_VNET_HDR; | |
1722 | ||
c8d68e6b JW |
1723 | if (ifr->ifr_flags & IFF_MULTI_QUEUE) |
1724 | tun->flags |= TUN_TAP_MQ; | |
1725 | else | |
1726 | tun->flags &= ~TUN_TAP_MQ; | |
1727 | ||
e35259a9 MK |
1728 | /* Make sure persistent devices do not get stuck in |
1729 | * xoff state. | |
1730 | */ | |
1731 | if (netif_running(tun->dev)) | |
c8d68e6b | 1732 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 1733 | |
1da177e4 LT |
1734 | strcpy(ifr->ifr_name, tun->dev->name); |
1735 | return 0; | |
1736 | ||
662ca437 JW |
1737 | err_detach: |
1738 | tun_detach_all(dev); | |
1739 | err_free_flow: | |
1740 | tun_flow_uninit(tun); | |
1741 | security_tun_dev_free_security(tun->security); | |
1742 | err_free_dev: | |
1da177e4 | 1743 | free_netdev(dev); |
1da177e4 LT |
1744 | return err; |
1745 | } | |
1746 | ||
9ce99cf6 | 1747 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 1748 | struct ifreq *ifr) |
e3b99556 | 1749 | { |
6b8a66ee | 1750 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1751 | |
1752 | strcpy(ifr->ifr_name, tun->dev->name); | |
1753 | ||
980c9e8c | 1754 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 1755 | |
e3b99556 MM |
1756 | } |
1757 | ||
5228ddc9 RR |
1758 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1759 | * privs required. */ | |
88255375 | 1760 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1761 | { |
c8f44aff | 1762 | netdev_features_t features = 0; |
5228ddc9 RR |
1763 | |
1764 | if (arg & TUN_F_CSUM) { | |
88255375 | 1765 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1766 | arg &= ~TUN_F_CSUM; |
1767 | ||
1768 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1769 | if (arg & TUN_F_TSO_ECN) { | |
1770 | features |= NETIF_F_TSO_ECN; | |
1771 | arg &= ~TUN_F_TSO_ECN; | |
1772 | } | |
1773 | if (arg & TUN_F_TSO4) | |
1774 | features |= NETIF_F_TSO; | |
1775 | if (arg & TUN_F_TSO6) | |
1776 | features |= NETIF_F_TSO6; | |
1777 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1778 | } | |
1779 | } | |
1780 | ||
1781 | /* This gives the user a way to test for new features in future by | |
1782 | * trying to set them. */ | |
1783 | if (arg) | |
1784 | return -EINVAL; | |
1785 | ||
88255375 MM |
1786 | tun->set_features = features; |
1787 | netdev_update_features(tun->dev); | |
5228ddc9 RR |
1788 | |
1789 | return 0; | |
1790 | } | |
1791 | ||
c8d68e6b JW |
1792 | static void tun_detach_filter(struct tun_struct *tun, int n) |
1793 | { | |
1794 | int i; | |
1795 | struct tun_file *tfile; | |
1796 | ||
1797 | for (i = 0; i < n; i++) { | |
b8deabd3 | 1798 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1799 | sk_detach_filter(tfile->socket.sk); |
1800 | } | |
1801 | ||
1802 | tun->filter_attached = false; | |
1803 | } | |
1804 | ||
1805 | static int tun_attach_filter(struct tun_struct *tun) | |
1806 | { | |
1807 | int i, ret = 0; | |
1808 | struct tun_file *tfile; | |
1809 | ||
1810 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1811 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1812 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
1813 | if (ret) { | |
1814 | tun_detach_filter(tun, i); | |
1815 | return ret; | |
1816 | } | |
1817 | } | |
1818 | ||
1819 | tun->filter_attached = true; | |
1820 | return ret; | |
1821 | } | |
1822 | ||
1823 | static void tun_set_sndbuf(struct tun_struct *tun) | |
1824 | { | |
1825 | struct tun_file *tfile; | |
1826 | int i; | |
1827 | ||
1828 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1829 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1830 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
1831 | } | |
1832 | } | |
1833 | ||
cde8b15f JW |
1834 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
1835 | { | |
1836 | struct tun_file *tfile = file->private_data; | |
1837 | struct tun_struct *tun; | |
cde8b15f JW |
1838 | int ret = 0; |
1839 | ||
1840 | rtnl_lock(); | |
1841 | ||
1842 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 1843 | tun = tfile->detached; |
5dbbaf2d | 1844 | if (!tun) { |
cde8b15f | 1845 | ret = -EINVAL; |
5dbbaf2d PM |
1846 | goto unlock; |
1847 | } | |
1848 | ret = security_tun_dev_attach_queue(tun->security); | |
1849 | if (ret < 0) | |
1850 | goto unlock; | |
849c9b6f | 1851 | ret = tun_attach(tun, file, false); |
4008e97f | 1852 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 1853 | tun = rtnl_dereference(tfile->tun); |
9e85722d | 1854 | if (!tun || !(tun->flags & TUN_TAP_MQ) || tfile->detached) |
4008e97f JW |
1855 | ret = -EINVAL; |
1856 | else | |
1857 | __tun_detach(tfile, false); | |
1858 | } else | |
cde8b15f JW |
1859 | ret = -EINVAL; |
1860 | ||
5dbbaf2d | 1861 | unlock: |
cde8b15f JW |
1862 | rtnl_unlock(); |
1863 | return ret; | |
1864 | } | |
1865 | ||
50857e2a AB |
1866 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1867 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1868 | { |
36b50bab | 1869 | struct tun_file *tfile = file->private_data; |
631ab46b | 1870 | struct tun_struct *tun; |
1da177e4 LT |
1871 | void __user* argp = (void __user*)arg; |
1872 | struct ifreq ifr; | |
0625c883 EB |
1873 | kuid_t owner; |
1874 | kgid_t group; | |
33dccbb0 | 1875 | int sndbuf; |
d9d52b51 | 1876 | int vnet_hdr_sz; |
fb7589a1 | 1877 | unsigned int ifindex; |
f271b2cc | 1878 | int ret; |
1da177e4 | 1879 | |
cde8b15f | 1880 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) { |
50857e2a | 1881 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 1882 | return -EFAULT; |
8bbb1813 | 1883 | } else { |
a117dacd | 1884 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 1885 | } |
631ab46b EB |
1886 | if (cmd == TUNGETFEATURES) { |
1887 | /* Currently this just means: "what IFF flags are valid?". | |
1888 | * This is needed because we never checked for invalid flags on | |
1889 | * TUNSETIFF. */ | |
1890 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
cde8b15f | 1891 | IFF_VNET_HDR | IFF_MULTI_QUEUE, |
631ab46b | 1892 | (unsigned int __user*)argp); |
cde8b15f JW |
1893 | } else if (cmd == TUNSETQUEUE) |
1894 | return tun_set_queue(file, &ifr); | |
631ab46b | 1895 | |
c8d68e6b | 1896 | ret = 0; |
876bfd4d HX |
1897 | rtnl_lock(); |
1898 | ||
36b50bab | 1899 | tun = __tun_get(tfile); |
1da177e4 | 1900 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1901 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1902 | ||
876bfd4d | 1903 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1904 | |
876bfd4d HX |
1905 | if (ret) |
1906 | goto unlock; | |
1da177e4 | 1907 | |
50857e2a | 1908 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1909 | ret = -EFAULT; |
1910 | goto unlock; | |
1da177e4 | 1911 | } |
fb7589a1 PE |
1912 | if (cmd == TUNSETIFINDEX) { |
1913 | ret = -EPERM; | |
1914 | if (tun) | |
1915 | goto unlock; | |
1916 | ||
1917 | ret = -EFAULT; | |
1918 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) | |
1919 | goto unlock; | |
1920 | ||
1921 | ret = 0; | |
1922 | tfile->ifindex = ifindex; | |
1923 | goto unlock; | |
1924 | } | |
1da177e4 | 1925 | |
876bfd4d | 1926 | ret = -EBADFD; |
1da177e4 | 1927 | if (!tun) |
876bfd4d | 1928 | goto unlock; |
1da177e4 | 1929 | |
1e588338 | 1930 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 1931 | |
631ab46b | 1932 | ret = 0; |
1da177e4 | 1933 | switch (cmd) { |
e3b99556 | 1934 | case TUNGETIFF: |
9ce99cf6 | 1935 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1936 | |
3d407a80 PE |
1937 | if (tfile->detached) |
1938 | ifr.ifr_flags |= IFF_DETACH_QUEUE; | |
849c9b6f PE |
1939 | if (!tfile->socket.sk->sk_filter) |
1940 | ifr.ifr_flags |= IFF_NOFILTER; | |
3d407a80 | 1941 | |
50857e2a | 1942 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1943 | ret = -EFAULT; |
e3b99556 MM |
1944 | break; |
1945 | ||
1da177e4 LT |
1946 | case TUNSETNOCSUM: |
1947 | /* Disable/Enable checksum */ | |
1da177e4 | 1948 | |
88255375 MM |
1949 | /* [unimplemented] */ |
1950 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 1951 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
1952 | break; |
1953 | ||
1954 | case TUNSETPERSIST: | |
54f968d6 JW |
1955 | /* Disable/Enable persist mode. Keep an extra reference to the |
1956 | * module to prevent the module being unprobed. | |
1957 | */ | |
dd38bd85 | 1958 | if (arg && !(tun->flags & TUN_PERSIST)) { |
1da177e4 | 1959 | tun->flags |= TUN_PERSIST; |
54f968d6 | 1960 | __module_get(THIS_MODULE); |
dd38bd85 JW |
1961 | } |
1962 | if (!arg && (tun->flags & TUN_PERSIST)) { | |
1da177e4 | 1963 | tun->flags &= ~TUN_PERSIST; |
54f968d6 JW |
1964 | module_put(THIS_MODULE); |
1965 | } | |
1da177e4 | 1966 | |
6b8a66ee JP |
1967 | tun_debug(KERN_INFO, tun, "persist %s\n", |
1968 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
1969 | break; |
1970 | ||
1971 | case TUNSETOWNER: | |
1972 | /* Set owner of the device */ | |
0625c883 EB |
1973 | owner = make_kuid(current_user_ns(), arg); |
1974 | if (!uid_valid(owner)) { | |
1975 | ret = -EINVAL; | |
1976 | break; | |
1977 | } | |
1978 | tun->owner = owner; | |
1e588338 | 1979 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 1980 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
1981 | break; |
1982 | ||
8c644623 GG |
1983 | case TUNSETGROUP: |
1984 | /* Set group of the device */ | |
0625c883 EB |
1985 | group = make_kgid(current_user_ns(), arg); |
1986 | if (!gid_valid(group)) { | |
1987 | ret = -EINVAL; | |
1988 | break; | |
1989 | } | |
1990 | tun->group = group; | |
1e588338 | 1991 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 1992 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
1993 | break; |
1994 | ||
ff4cc3ac MK |
1995 | case TUNSETLINK: |
1996 | /* Only allow setting the type when the interface is down */ | |
1997 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
1998 | tun_debug(KERN_INFO, tun, |
1999 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 2000 | ret = -EBUSY; |
ff4cc3ac MK |
2001 | } else { |
2002 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
2003 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
2004 | tun->dev->type); | |
48abfe05 | 2005 | ret = 0; |
ff4cc3ac | 2006 | } |
631ab46b | 2007 | break; |
ff4cc3ac | 2008 | |
1da177e4 LT |
2009 | #ifdef TUN_DEBUG |
2010 | case TUNSETDEBUG: | |
2011 | tun->debug = arg; | |
2012 | break; | |
2013 | #endif | |
5228ddc9 | 2014 | case TUNSETOFFLOAD: |
88255375 | 2015 | ret = set_offload(tun, arg); |
631ab46b | 2016 | break; |
5228ddc9 | 2017 | |
f271b2cc MK |
2018 | case TUNSETTXFILTER: |
2019 | /* Can be set only for TAPs */ | |
631ab46b | 2020 | ret = -EINVAL; |
f271b2cc | 2021 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 2022 | break; |
c0e5a8c2 | 2023 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 2024 | break; |
1da177e4 LT |
2025 | |
2026 | case SIOCGIFHWADDR: | |
b595076a | 2027 | /* Get hw address */ |
f271b2cc MK |
2028 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
2029 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 2030 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
2031 | ret = -EFAULT; |
2032 | break; | |
1da177e4 LT |
2033 | |
2034 | case SIOCSIFHWADDR: | |
f271b2cc | 2035 | /* Set hw address */ |
6b8a66ee JP |
2036 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
2037 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 2038 | |
40102371 | 2039 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 2040 | break; |
33dccbb0 HX |
2041 | |
2042 | case TUNGETSNDBUF: | |
54f968d6 | 2043 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
2044 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
2045 | ret = -EFAULT; | |
2046 | break; | |
2047 | ||
2048 | case TUNSETSNDBUF: | |
2049 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
2050 | ret = -EFAULT; | |
2051 | break; | |
2052 | } | |
2053 | ||
c8d68e6b JW |
2054 | tun->sndbuf = sndbuf; |
2055 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
2056 | break; |
2057 | ||
d9d52b51 MT |
2058 | case TUNGETVNETHDRSZ: |
2059 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
2060 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
2061 | ret = -EFAULT; | |
2062 | break; | |
2063 | ||
2064 | case TUNSETVNETHDRSZ: | |
2065 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
2066 | ret = -EFAULT; | |
2067 | break; | |
2068 | } | |
2069 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
2070 | ret = -EINVAL; | |
2071 | break; | |
2072 | } | |
2073 | ||
2074 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
2075 | break; | |
2076 | ||
99405162 MT |
2077 | case TUNATTACHFILTER: |
2078 | /* Can be set only for TAPs */ | |
2079 | ret = -EINVAL; | |
2080 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2081 | break; | |
2082 | ret = -EFAULT; | |
54f968d6 | 2083 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
2084 | break; |
2085 | ||
c8d68e6b | 2086 | ret = tun_attach_filter(tun); |
99405162 MT |
2087 | break; |
2088 | ||
2089 | case TUNDETACHFILTER: | |
2090 | /* Can be set only for TAPs */ | |
2091 | ret = -EINVAL; | |
2092 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2093 | break; | |
c8d68e6b JW |
2094 | ret = 0; |
2095 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
2096 | break; |
2097 | ||
76975e9c PE |
2098 | case TUNGETFILTER: |
2099 | ret = -EINVAL; | |
2100 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2101 | break; | |
2102 | ret = -EFAULT; | |
2103 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) | |
2104 | break; | |
2105 | ret = 0; | |
2106 | break; | |
2107 | ||
1da177e4 | 2108 | default: |
631ab46b EB |
2109 | ret = -EINVAL; |
2110 | break; | |
ee289b64 | 2111 | } |
1da177e4 | 2112 | |
876bfd4d HX |
2113 | unlock: |
2114 | rtnl_unlock(); | |
2115 | if (tun) | |
2116 | tun_put(tun); | |
631ab46b | 2117 | return ret; |
1da177e4 LT |
2118 | } |
2119 | ||
50857e2a AB |
2120 | static long tun_chr_ioctl(struct file *file, |
2121 | unsigned int cmd, unsigned long arg) | |
2122 | { | |
2123 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
2124 | } | |
2125 | ||
2126 | #ifdef CONFIG_COMPAT | |
2127 | static long tun_chr_compat_ioctl(struct file *file, | |
2128 | unsigned int cmd, unsigned long arg) | |
2129 | { | |
2130 | switch (cmd) { | |
2131 | case TUNSETIFF: | |
2132 | case TUNGETIFF: | |
2133 | case TUNSETTXFILTER: | |
2134 | case TUNGETSNDBUF: | |
2135 | case TUNSETSNDBUF: | |
2136 | case SIOCGIFHWADDR: | |
2137 | case SIOCSIFHWADDR: | |
2138 | arg = (unsigned long)compat_ptr(arg); | |
2139 | break; | |
2140 | default: | |
2141 | arg = (compat_ulong_t)arg; | |
2142 | break; | |
2143 | } | |
2144 | ||
2145 | /* | |
2146 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
2147 | * the end of that structure. All fields that are used in this | |
2148 | * driver are compatible though, we don't need to convert the | |
2149 | * contents. | |
2150 | */ | |
2151 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
2152 | } | |
2153 | #endif /* CONFIG_COMPAT */ | |
2154 | ||
1da177e4 LT |
2155 | static int tun_chr_fasync(int fd, struct file *file, int on) |
2156 | { | |
54f968d6 | 2157 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2158 | int ret; |
2159 | ||
54f968d6 | 2160 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 2161 | goto out; |
6aa20a22 | 2162 | |
1da177e4 | 2163 | if (on) { |
e0b93edd | 2164 | __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
54f968d6 | 2165 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 2166 | } else |
54f968d6 | 2167 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
2168 | ret = 0; |
2169 | out: | |
9d319522 | 2170 | return ret; |
1da177e4 LT |
2171 | } |
2172 | ||
2173 | static int tun_chr_open(struct inode *inode, struct file * file) | |
2174 | { | |
631ab46b | 2175 | struct tun_file *tfile; |
deed49fb | 2176 | |
6b8a66ee | 2177 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 2178 | |
54f968d6 JW |
2179 | tfile = (struct tun_file *)sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL, |
2180 | &tun_proto); | |
631ab46b EB |
2181 | if (!tfile) |
2182 | return -ENOMEM; | |
c956674b | 2183 | RCU_INIT_POINTER(tfile->tun, NULL); |
36b50bab | 2184 | tfile->net = get_net(current->nsproxy->net_ns); |
54f968d6 | 2185 | tfile->flags = 0; |
fb7589a1 | 2186 | tfile->ifindex = 0; |
54f968d6 | 2187 | |
54f968d6 | 2188 | init_waitqueue_head(&tfile->wq.wait); |
9e641bdc | 2189 | RCU_INIT_POINTER(tfile->socket.wq, &tfile->wq); |
54f968d6 JW |
2190 | |
2191 | tfile->socket.file = file; | |
2192 | tfile->socket.ops = &tun_socket_ops; | |
2193 | ||
2194 | sock_init_data(&tfile->socket, &tfile->sk); | |
2195 | sk_change_net(&tfile->sk, tfile->net); | |
2196 | ||
2197 | tfile->sk.sk_write_space = tun_sock_write_space; | |
2198 | tfile->sk.sk_sndbuf = INT_MAX; | |
2199 | ||
631ab46b | 2200 | file->private_data = tfile; |
54f968d6 | 2201 | set_bit(SOCK_EXTERNALLY_ALLOCATED, &tfile->socket.flags); |
4008e97f | 2202 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 2203 | |
19a6afb2 JW |
2204 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
2205 | ||
1da177e4 LT |
2206 | return 0; |
2207 | } | |
2208 | ||
2209 | static int tun_chr_close(struct inode *inode, struct file *file) | |
2210 | { | |
631ab46b | 2211 | struct tun_file *tfile = file->private_data; |
54f968d6 | 2212 | struct net *net = tfile->net; |
1da177e4 | 2213 | |
c8d68e6b | 2214 | tun_detach(tfile, true); |
54f968d6 | 2215 | put_net(net); |
1da177e4 LT |
2216 | |
2217 | return 0; | |
2218 | } | |
2219 | ||
93e14b6d MY |
2220 | #ifdef CONFIG_PROC_FS |
2221 | static int tun_chr_show_fdinfo(struct seq_file *m, struct file *f) | |
2222 | { | |
2223 | struct tun_struct *tun; | |
2224 | struct ifreq ifr; | |
2225 | ||
2226 | memset(&ifr, 0, sizeof(ifr)); | |
2227 | ||
2228 | rtnl_lock(); | |
2229 | tun = tun_get(f); | |
2230 | if (tun) | |
2231 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); | |
2232 | rtnl_unlock(); | |
2233 | ||
2234 | if (tun) | |
2235 | tun_put(tun); | |
2236 | ||
2237 | return seq_printf(m, "iff:\t%s\n", ifr.ifr_name); | |
2238 | } | |
2239 | #endif | |
2240 | ||
d54b1fdb | 2241 | static const struct file_operations tun_fops = { |
6aa20a22 | 2242 | .owner = THIS_MODULE, |
1da177e4 | 2243 | .llseek = no_llseek, |
ee0b3e67 BP |
2244 | .read = do_sync_read, |
2245 | .aio_read = tun_chr_aio_read, | |
2246 | .write = do_sync_write, | |
2247 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 2248 | .poll = tun_chr_poll, |
50857e2a AB |
2249 | .unlocked_ioctl = tun_chr_ioctl, |
2250 | #ifdef CONFIG_COMPAT | |
2251 | .compat_ioctl = tun_chr_compat_ioctl, | |
2252 | #endif | |
1da177e4 LT |
2253 | .open = tun_chr_open, |
2254 | .release = tun_chr_close, | |
93e14b6d MY |
2255 | .fasync = tun_chr_fasync, |
2256 | #ifdef CONFIG_PROC_FS | |
2257 | .show_fdinfo = tun_chr_show_fdinfo, | |
2258 | #endif | |
1da177e4 LT |
2259 | }; |
2260 | ||
2261 | static struct miscdevice tun_miscdev = { | |
2262 | .minor = TUN_MINOR, | |
2263 | .name = "tun", | |
e454cea2 | 2264 | .nodename = "net/tun", |
1da177e4 | 2265 | .fops = &tun_fops, |
1da177e4 LT |
2266 | }; |
2267 | ||
2268 | /* ethtool interface */ | |
2269 | ||
2270 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
2271 | { | |
2272 | cmd->supported = 0; | |
2273 | cmd->advertising = 0; | |
70739497 | 2274 | ethtool_cmd_speed_set(cmd, SPEED_10); |
1da177e4 LT |
2275 | cmd->duplex = DUPLEX_FULL; |
2276 | cmd->port = PORT_TP; | |
2277 | cmd->phy_address = 0; | |
2278 | cmd->transceiver = XCVR_INTERNAL; | |
2279 | cmd->autoneg = AUTONEG_DISABLE; | |
2280 | cmd->maxtxpkt = 0; | |
2281 | cmd->maxrxpkt = 0; | |
2282 | return 0; | |
2283 | } | |
2284 | ||
2285 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
2286 | { | |
2287 | struct tun_struct *tun = netdev_priv(dev); | |
2288 | ||
33a5ba14 RJ |
2289 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
2290 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
2291 | |
2292 | switch (tun->flags & TUN_TYPE_MASK) { | |
2293 | case TUN_TUN_DEV: | |
33a5ba14 | 2294 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 LT |
2295 | break; |
2296 | case TUN_TAP_DEV: | |
33a5ba14 | 2297 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
2298 | break; |
2299 | } | |
2300 | } | |
2301 | ||
2302 | static u32 tun_get_msglevel(struct net_device *dev) | |
2303 | { | |
2304 | #ifdef TUN_DEBUG | |
2305 | struct tun_struct *tun = netdev_priv(dev); | |
2306 | return tun->debug; | |
2307 | #else | |
2308 | return -EOPNOTSUPP; | |
2309 | #endif | |
2310 | } | |
2311 | ||
2312 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
2313 | { | |
2314 | #ifdef TUN_DEBUG | |
2315 | struct tun_struct *tun = netdev_priv(dev); | |
2316 | tun->debug = value; | |
2317 | #endif | |
2318 | } | |
2319 | ||
7282d491 | 2320 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
2321 | .get_settings = tun_get_settings, |
2322 | .get_drvinfo = tun_get_drvinfo, | |
2323 | .get_msglevel = tun_get_msglevel, | |
2324 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 2325 | .get_link = ethtool_op_get_link, |
eda29772 | 2326 | .get_ts_info = ethtool_op_get_ts_info, |
1da177e4 LT |
2327 | }; |
2328 | ||
79d17604 | 2329 | |
1da177e4 LT |
2330 | static int __init tun_init(void) |
2331 | { | |
2332 | int ret = 0; | |
2333 | ||
6b8a66ee JP |
2334 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
2335 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 2336 | |
f019a7a5 | 2337 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 2338 | if (ret) { |
6b8a66ee | 2339 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 2340 | goto err_linkops; |
79d17604 PE |
2341 | } |
2342 | ||
1da177e4 | 2343 | ret = misc_register(&tun_miscdev); |
79d17604 | 2344 | if (ret) { |
6b8a66ee | 2345 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
2346 | goto err_misc; |
2347 | } | |
f019a7a5 | 2348 | return 0; |
79d17604 | 2349 | err_misc: |
f019a7a5 EB |
2350 | rtnl_link_unregister(&tun_link_ops); |
2351 | err_linkops: | |
1da177e4 LT |
2352 | return ret; |
2353 | } | |
2354 | ||
2355 | static void tun_cleanup(void) | |
2356 | { | |
6aa20a22 | 2357 | misc_deregister(&tun_miscdev); |
f019a7a5 | 2358 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
2359 | } |
2360 | ||
05c2828c MT |
2361 | /* Get an underlying socket object from tun file. Returns error unless file is |
2362 | * attached to a device. The returned object works like a packet socket, it | |
2363 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
2364 | * holding a reference to the file for as long as the socket is in use. */ | |
2365 | struct socket *tun_get_socket(struct file *file) | |
2366 | { | |
6e914fc7 | 2367 | struct tun_file *tfile; |
05c2828c MT |
2368 | if (file->f_op != &tun_fops) |
2369 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
2370 | tfile = file->private_data; |
2371 | if (!tfile) | |
05c2828c | 2372 | return ERR_PTR(-EBADFD); |
54f968d6 | 2373 | return &tfile->socket; |
05c2828c MT |
2374 | } |
2375 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
2376 | ||
1da177e4 LT |
2377 | module_init(tun_init); |
2378 | module_exit(tun_cleanup); | |
2379 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
2380 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
2381 | MODULE_LICENSE("GPL"); | |
2382 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 2383 | MODULE_ALIAS("devname:net/tun"); |