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Commit | Line | Data |
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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> |
1da177e4 | 73 | |
1da177e4 LT |
74 | #include <asm/uaccess.h> |
75 | ||
14daa021 RR |
76 | /* Uncomment to enable debugging */ |
77 | /* #define TUN_DEBUG 1 */ | |
78 | ||
1da177e4 LT |
79 | #ifdef TUN_DEBUG |
80 | static int debug; | |
14daa021 | 81 | |
6b8a66ee JP |
82 | #define tun_debug(level, tun, fmt, args...) \ |
83 | do { \ | |
84 | if (tun->debug) \ | |
85 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
86 | } while (0) | |
87 | #define DBG1(level, fmt, args...) \ | |
88 | do { \ | |
89 | if (debug == 2) \ | |
90 | printk(level fmt, ##args); \ | |
91 | } while (0) | |
14daa021 | 92 | #else |
6b8a66ee JP |
93 | #define tun_debug(level, tun, fmt, args...) \ |
94 | do { \ | |
95 | if (0) \ | |
96 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
97 | } while (0) | |
98 | #define DBG1(level, fmt, args...) \ | |
99 | do { \ | |
100 | if (0) \ | |
101 | printk(level fmt, ##args); \ | |
102 | } while (0) | |
14daa021 RR |
103 | #endif |
104 | ||
0690899b MT |
105 | #define GOODCOPY_LEN 128 |
106 | ||
f271b2cc MK |
107 | #define FLT_EXACT_COUNT 8 |
108 | struct tap_filter { | |
109 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
110 | u32 mask[2]; /* Mask of the hashed addrs */ | |
111 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
112 | }; | |
113 | ||
92d4ea6e | 114 | /* DEFAULT_MAX_NUM_RSS_QUEUES were chosen to let the rx/tx queues allocated for |
edfb6a14 JW |
115 | * the netdevice to be fit in one page. So we can make sure the success of |
116 | * memory allocation. TODO: increase the limit. */ | |
117 | #define MAX_TAP_QUEUES DEFAULT_MAX_NUM_RSS_QUEUES | |
b8732fb7 | 118 | #define MAX_TAP_FLOWS 4096 |
c8d68e6b | 119 | |
96442e42 JW |
120 | #define TUN_FLOW_EXPIRE (3 * HZ) |
121 | ||
54f968d6 | 122 | /* A tun_file connects an open character device to a tuntap netdevice. It |
92d4ea6e | 123 | * also contains all socket related structures (except sock_fprog and tap_filter) |
54f968d6 JW |
124 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
125 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 126 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 127 | * this). |
6e914fc7 JW |
128 | * |
129 | * RCU usage: | |
36fe8c09 | 130 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 131 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 132 | */ |
631ab46b | 133 | struct tun_file { |
54f968d6 JW |
134 | struct sock sk; |
135 | struct socket socket; | |
136 | struct socket_wq wq; | |
6e914fc7 | 137 | struct tun_struct __rcu *tun; |
36b50bab | 138 | struct net *net; |
54f968d6 JW |
139 | struct fasync_struct *fasync; |
140 | /* only used for fasnyc */ | |
141 | unsigned int flags; | |
fb7589a1 PE |
142 | union { |
143 | u16 queue_index; | |
144 | unsigned int ifindex; | |
145 | }; | |
4008e97f JW |
146 | struct list_head next; |
147 | struct tun_struct *detached; | |
631ab46b EB |
148 | }; |
149 | ||
96442e42 JW |
150 | struct tun_flow_entry { |
151 | struct hlist_node hash_link; | |
152 | struct rcu_head rcu; | |
153 | struct tun_struct *tun; | |
154 | ||
155 | u32 rxhash; | |
9bc88939 | 156 | u32 rps_rxhash; |
96442e42 JW |
157 | int queue_index; |
158 | unsigned long updated; | |
159 | }; | |
160 | ||
161 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
162 | ||
54f968d6 | 163 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 164 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
165 | * file were attached to a persist device. |
166 | */ | |
14daa021 | 167 | struct tun_struct { |
c8d68e6b JW |
168 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
169 | unsigned int numqueues; | |
f271b2cc | 170 | unsigned int flags; |
0625c883 EB |
171 | kuid_t owner; |
172 | kgid_t group; | |
14daa021 | 173 | |
14daa021 | 174 | struct net_device *dev; |
c8f44aff | 175 | netdev_features_t set_features; |
88255375 MM |
176 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
177 | NETIF_F_TSO6|NETIF_F_UFO) | |
d9d52b51 MT |
178 | |
179 | int vnet_hdr_sz; | |
54f968d6 JW |
180 | int sndbuf; |
181 | struct tap_filter txflt; | |
182 | struct sock_fprog fprog; | |
183 | /* protected by rtnl lock */ | |
184 | bool filter_attached; | |
14daa021 RR |
185 | #ifdef TUN_DEBUG |
186 | int debug; | |
1da177e4 | 187 | #endif |
96442e42 | 188 | spinlock_t lock; |
96442e42 JW |
189 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
190 | struct timer_list flow_gc_timer; | |
191 | unsigned long ageing_time; | |
4008e97f JW |
192 | unsigned int numdisabled; |
193 | struct list_head disabled; | |
5dbbaf2d | 194 | void *security; |
b8732fb7 | 195 | u32 flow_count; |
14daa021 | 196 | }; |
1da177e4 | 197 | |
96442e42 JW |
198 | static inline u32 tun_hashfn(u32 rxhash) |
199 | { | |
200 | return rxhash & 0x3ff; | |
201 | } | |
202 | ||
203 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
204 | { | |
205 | struct tun_flow_entry *e; | |
96442e42 | 206 | |
b67bfe0d | 207 | hlist_for_each_entry_rcu(e, head, hash_link) { |
96442e42 JW |
208 | if (e->rxhash == rxhash) |
209 | return e; | |
210 | } | |
211 | return NULL; | |
212 | } | |
213 | ||
214 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
215 | struct hlist_head *head, | |
216 | u32 rxhash, u16 queue_index) | |
217 | { | |
9fdc6bef ED |
218 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
219 | ||
96442e42 JW |
220 | if (e) { |
221 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
222 | rxhash, queue_index); | |
223 | e->updated = jiffies; | |
224 | e->rxhash = rxhash; | |
9bc88939 | 225 | e->rps_rxhash = 0; |
96442e42 JW |
226 | e->queue_index = queue_index; |
227 | e->tun = tun; | |
228 | hlist_add_head_rcu(&e->hash_link, head); | |
b8732fb7 | 229 | ++tun->flow_count; |
96442e42 JW |
230 | } |
231 | return e; | |
232 | } | |
233 | ||
96442e42 JW |
234 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
235 | { | |
236 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
237 | e->rxhash, e->queue_index); | |
9bc88939 | 238 | sock_rps_reset_flow_hash(e->rps_rxhash); |
96442e42 | 239 | hlist_del_rcu(&e->hash_link); |
9fdc6bef | 240 | kfree_rcu(e, rcu); |
b8732fb7 | 241 | --tun->flow_count; |
96442e42 JW |
242 | } |
243 | ||
244 | static void tun_flow_flush(struct tun_struct *tun) | |
245 | { | |
246 | int i; | |
247 | ||
248 | spin_lock_bh(&tun->lock); | |
249 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
250 | struct tun_flow_entry *e; | |
b67bfe0d | 251 | struct hlist_node *n; |
96442e42 | 252 | |
b67bfe0d | 253 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
96442e42 JW |
254 | tun_flow_delete(tun, e); |
255 | } | |
256 | spin_unlock_bh(&tun->lock); | |
257 | } | |
258 | ||
259 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
260 | { | |
261 | int i; | |
262 | ||
263 | spin_lock_bh(&tun->lock); | |
264 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
265 | struct tun_flow_entry *e; | |
b67bfe0d | 266 | struct hlist_node *n; |
96442e42 | 267 | |
b67bfe0d | 268 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
269 | if (e->queue_index == queue_index) |
270 | tun_flow_delete(tun, e); | |
271 | } | |
272 | } | |
273 | spin_unlock_bh(&tun->lock); | |
274 | } | |
275 | ||
276 | static void tun_flow_cleanup(unsigned long data) | |
277 | { | |
278 | struct tun_struct *tun = (struct tun_struct *)data; | |
279 | unsigned long delay = tun->ageing_time; | |
280 | unsigned long next_timer = jiffies + delay; | |
281 | unsigned long count = 0; | |
282 | int i; | |
283 | ||
284 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
285 | ||
286 | spin_lock_bh(&tun->lock); | |
287 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
288 | struct tun_flow_entry *e; | |
b67bfe0d | 289 | struct hlist_node *n; |
96442e42 | 290 | |
b67bfe0d | 291 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
292 | unsigned long this_timer; |
293 | count++; | |
294 | this_timer = e->updated + delay; | |
295 | if (time_before_eq(this_timer, jiffies)) | |
296 | tun_flow_delete(tun, e); | |
297 | else if (time_before(this_timer, next_timer)) | |
298 | next_timer = this_timer; | |
299 | } | |
300 | } | |
301 | ||
302 | if (count) | |
303 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
304 | spin_unlock_bh(&tun->lock); | |
305 | } | |
306 | ||
49974420 | 307 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
9e85722d | 308 | struct tun_file *tfile) |
96442e42 JW |
309 | { |
310 | struct hlist_head *head; | |
311 | struct tun_flow_entry *e; | |
312 | unsigned long delay = tun->ageing_time; | |
9e85722d | 313 | u16 queue_index = tfile->queue_index; |
96442e42 JW |
314 | |
315 | if (!rxhash) | |
316 | return; | |
317 | else | |
318 | head = &tun->flows[tun_hashfn(rxhash)]; | |
319 | ||
320 | rcu_read_lock(); | |
321 | ||
9e85722d JW |
322 | /* We may get a very small possibility of OOO during switching, not |
323 | * worth to optimize.*/ | |
324 | if (tun->numqueues == 1 || tfile->detached) | |
96442e42 JW |
325 | goto unlock; |
326 | ||
327 | e = tun_flow_find(head, rxhash); | |
328 | if (likely(e)) { | |
329 | /* TODO: keep queueing to old queue until it's empty? */ | |
330 | e->queue_index = queue_index; | |
331 | e->updated = jiffies; | |
9bc88939 | 332 | sock_rps_record_flow_hash(e->rps_rxhash); |
96442e42 JW |
333 | } else { |
334 | spin_lock_bh(&tun->lock); | |
b8732fb7 JW |
335 | if (!tun_flow_find(head, rxhash) && |
336 | tun->flow_count < MAX_TAP_FLOWS) | |
96442e42 JW |
337 | tun_flow_create(tun, head, rxhash, queue_index); |
338 | ||
339 | if (!timer_pending(&tun->flow_gc_timer)) | |
340 | mod_timer(&tun->flow_gc_timer, | |
341 | round_jiffies_up(jiffies + delay)); | |
342 | spin_unlock_bh(&tun->lock); | |
343 | } | |
344 | ||
345 | unlock: | |
346 | rcu_read_unlock(); | |
347 | } | |
348 | ||
9bc88939 TH |
349 | /** |
350 | * Save the hash received in the stack receive path and update the | |
351 | * flow_hash table accordingly. | |
352 | */ | |
353 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) | |
354 | { | |
355 | if (unlikely(e->rps_rxhash != hash)) { | |
356 | sock_rps_reset_flow_hash(e->rps_rxhash); | |
357 | e->rps_rxhash = hash; | |
358 | } | |
359 | } | |
360 | ||
c8d68e6b | 361 | /* We try to identify a flow through its rxhash first. The reason that |
92d4ea6e | 362 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
c8d68e6b JW |
363 | * the rxq based on the txq where the last packet of the flow comes. As |
364 | * the userspace application move between processors, we may get a | |
365 | * different rxq no. here. If we could not get rxhash, then we would | |
366 | * hope the rxq no. may help here. | |
367 | */ | |
f663dd9a | 368 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, |
99932d4f | 369 | void *accel_priv, select_queue_fallback_t fallback) |
c8d68e6b JW |
370 | { |
371 | struct tun_struct *tun = netdev_priv(dev); | |
96442e42 | 372 | struct tun_flow_entry *e; |
c8d68e6b JW |
373 | u32 txq = 0; |
374 | u32 numqueues = 0; | |
375 | ||
376 | rcu_read_lock(); | |
92bb73ea | 377 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 378 | |
3958afa1 | 379 | txq = skb_get_hash(skb); |
c8d68e6b | 380 | if (txq) { |
96442e42 | 381 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
9bc88939 | 382 | if (e) { |
9bc88939 | 383 | tun_flow_save_rps_rxhash(e, txq); |
fbe4d456 | 384 | txq = e->queue_index; |
9bc88939 | 385 | } else |
96442e42 JW |
386 | /* use multiply and shift instead of expensive divide */ |
387 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
388 | } else if (likely(skb_rx_queue_recorded(skb))) { |
389 | txq = skb_get_rx_queue(skb); | |
390 | while (unlikely(txq >= numqueues)) | |
391 | txq -= numqueues; | |
392 | } | |
393 | ||
394 | rcu_read_unlock(); | |
395 | return txq; | |
396 | } | |
397 | ||
cde8b15f JW |
398 | static inline bool tun_not_capable(struct tun_struct *tun) |
399 | { | |
400 | const struct cred *cred = current_cred(); | |
c260b772 | 401 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
402 | |
403 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
404 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 405 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
406 | } |
407 | ||
c8d68e6b JW |
408 | static void tun_set_real_num_queues(struct tun_struct *tun) |
409 | { | |
410 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
411 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
412 | } | |
413 | ||
4008e97f JW |
414 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
415 | { | |
416 | tfile->detached = tun; | |
417 | list_add_tail(&tfile->next, &tun->disabled); | |
418 | ++tun->numdisabled; | |
419 | } | |
420 | ||
d32649d1 | 421 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
422 | { |
423 | struct tun_struct *tun = tfile->detached; | |
424 | ||
425 | tfile->detached = NULL; | |
426 | list_del_init(&tfile->next); | |
427 | --tun->numdisabled; | |
428 | return tun; | |
429 | } | |
430 | ||
4bfb0513 JW |
431 | static void tun_queue_purge(struct tun_file *tfile) |
432 | { | |
433 | skb_queue_purge(&tfile->sk.sk_receive_queue); | |
434 | skb_queue_purge(&tfile->sk.sk_error_queue); | |
435 | } | |
436 | ||
c8d68e6b JW |
437 | static void __tun_detach(struct tun_file *tfile, bool clean) |
438 | { | |
439 | struct tun_file *ntfile; | |
440 | struct tun_struct *tun; | |
c8d68e6b | 441 | |
b8deabd3 JW |
442 | tun = rtnl_dereference(tfile->tun); |
443 | ||
9e85722d | 444 | if (tun && !tfile->detached) { |
c8d68e6b JW |
445 | u16 index = tfile->queue_index; |
446 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
447 | |
448 | rcu_assign_pointer(tun->tfiles[index], | |
449 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 450 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
451 | ntfile->queue_index = index; |
452 | ||
453 | --tun->numqueues; | |
9e85722d | 454 | if (clean) { |
c956674b | 455 | RCU_INIT_POINTER(tfile->tun, NULL); |
4008e97f | 456 | sock_put(&tfile->sk); |
9e85722d | 457 | } else |
4008e97f | 458 | tun_disable_queue(tun, tfile); |
c8d68e6b JW |
459 | |
460 | synchronize_net(); | |
96442e42 | 461 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b | 462 | /* Drop read queue */ |
4bfb0513 | 463 | tun_queue_purge(tfile); |
c8d68e6b | 464 | tun_set_real_num_queues(tun); |
dd38bd85 | 465 | } else if (tfile->detached && clean) { |
4008e97f | 466 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
467 | sock_put(&tfile->sk); |
468 | } | |
c8d68e6b JW |
469 | |
470 | if (clean) { | |
af668b3c MT |
471 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
472 | netif_carrier_off(tun->dev); | |
473 | ||
474 | if (!(tun->flags & TUN_PERSIST) && | |
475 | tun->dev->reg_state == NETREG_REGISTERED) | |
4008e97f | 476 | unregister_netdevice(tun->dev); |
af668b3c | 477 | } |
4008e97f | 478 | |
c8d68e6b JW |
479 | BUG_ON(!test_bit(SOCK_EXTERNALLY_ALLOCATED, |
480 | &tfile->socket.flags)); | |
481 | sk_release_kernel(&tfile->sk); | |
482 | } | |
483 | } | |
484 | ||
485 | static void tun_detach(struct tun_file *tfile, bool clean) | |
486 | { | |
487 | rtnl_lock(); | |
488 | __tun_detach(tfile, clean); | |
489 | rtnl_unlock(); | |
490 | } | |
491 | ||
492 | static void tun_detach_all(struct net_device *dev) | |
493 | { | |
494 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 495 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
496 | int i, n = tun->numqueues; |
497 | ||
498 | for (i = 0; i < n; i++) { | |
b8deabd3 | 499 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 500 | BUG_ON(!tfile); |
9e641bdc | 501 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 502 | RCU_INIT_POINTER(tfile->tun, NULL); |
c8d68e6b JW |
503 | --tun->numqueues; |
504 | } | |
9e85722d | 505 | list_for_each_entry(tfile, &tun->disabled, next) { |
9e641bdc | 506 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 507 | RCU_INIT_POINTER(tfile->tun, NULL); |
9e85722d | 508 | } |
c8d68e6b JW |
509 | BUG_ON(tun->numqueues != 0); |
510 | ||
511 | synchronize_net(); | |
512 | for (i = 0; i < n; i++) { | |
b8deabd3 | 513 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 514 | /* Drop read queue */ |
4bfb0513 | 515 | tun_queue_purge(tfile); |
c8d68e6b JW |
516 | sock_put(&tfile->sk); |
517 | } | |
4008e97f JW |
518 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
519 | tun_enable_queue(tfile); | |
4bfb0513 | 520 | tun_queue_purge(tfile); |
4008e97f JW |
521 | sock_put(&tfile->sk); |
522 | } | |
523 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 JW |
524 | |
525 | if (tun->flags & TUN_PERSIST) | |
526 | module_put(THIS_MODULE); | |
c8d68e6b JW |
527 | } |
528 | ||
849c9b6f | 529 | static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filter) |
a7385ba2 | 530 | { |
631ab46b | 531 | struct tun_file *tfile = file->private_data; |
38231b7a | 532 | int err; |
a7385ba2 | 533 | |
5dbbaf2d PM |
534 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
535 | if (err < 0) | |
536 | goto out; | |
537 | ||
38231b7a | 538 | err = -EINVAL; |
9e85722d | 539 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
540 | goto out; |
541 | ||
542 | err = -EBUSY; | |
c8d68e6b JW |
543 | if (!(tun->flags & TUN_TAP_MQ) && tun->numqueues == 1) |
544 | goto out; | |
545 | ||
546 | err = -E2BIG; | |
4008e97f JW |
547 | if (!tfile->detached && |
548 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
549 | goto out; |
550 | ||
551 | err = 0; | |
54f968d6 | 552 | |
92d4ea6e | 553 | /* Re-attach the filter to persist device */ |
849c9b6f | 554 | if (!skip_filter && (tun->filter_attached == true)) { |
54f968d6 JW |
555 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
556 | if (!err) | |
557 | goto out; | |
558 | } | |
c8d68e6b | 559 | tfile->queue_index = tun->numqueues; |
6e914fc7 | 560 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 561 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 562 | tun->numqueues++; |
a7385ba2 | 563 | |
4008e97f JW |
564 | if (tfile->detached) |
565 | tun_enable_queue(tfile); | |
566 | else | |
567 | sock_hold(&tfile->sk); | |
568 | ||
c8d68e6b | 569 | tun_set_real_num_queues(tun); |
a7385ba2 | 570 | |
c8d68e6b JW |
571 | /* device is allowed to go away first, so no need to hold extra |
572 | * refcnt. | |
573 | */ | |
574 | ||
575 | out: | |
576 | return err; | |
631ab46b EB |
577 | } |
578 | ||
579 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
580 | { | |
6e914fc7 | 581 | struct tun_struct *tun; |
c70f1829 | 582 | |
6e914fc7 JW |
583 | rcu_read_lock(); |
584 | tun = rcu_dereference(tfile->tun); | |
585 | if (tun) | |
586 | dev_hold(tun->dev); | |
587 | rcu_read_unlock(); | |
c70f1829 EB |
588 | |
589 | return tun; | |
631ab46b EB |
590 | } |
591 | ||
592 | static struct tun_struct *tun_get(struct file *file) | |
593 | { | |
594 | return __tun_get(file->private_data); | |
595 | } | |
596 | ||
597 | static void tun_put(struct tun_struct *tun) | |
598 | { | |
6e914fc7 | 599 | dev_put(tun->dev); |
631ab46b EB |
600 | } |
601 | ||
6b8a66ee | 602 | /* TAP filtering */ |
f271b2cc MK |
603 | static void addr_hash_set(u32 *mask, const u8 *addr) |
604 | { | |
605 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
606 | mask[n >> 5] |= (1 << (n & 31)); | |
607 | } | |
608 | ||
609 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
610 | { | |
611 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
612 | return mask[n >> 5] & (1 << (n & 31)); | |
613 | } | |
614 | ||
615 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
616 | { | |
617 | struct { u8 u[ETH_ALEN]; } *addr; | |
618 | struct tun_filter uf; | |
619 | int err, alen, n, nexact; | |
620 | ||
621 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
622 | return -EFAULT; | |
623 | ||
624 | if (!uf.count) { | |
625 | /* Disabled */ | |
626 | filter->count = 0; | |
627 | return 0; | |
628 | } | |
629 | ||
630 | alen = ETH_ALEN * uf.count; | |
631 | addr = kmalloc(alen, GFP_KERNEL); | |
632 | if (!addr) | |
633 | return -ENOMEM; | |
634 | ||
635 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
636 | err = -EFAULT; | |
637 | goto done; | |
638 | } | |
639 | ||
640 | /* The filter is updated without holding any locks. Which is | |
641 | * perfectly safe. We disable it first and in the worst | |
642 | * case we'll accept a few undesired packets. */ | |
643 | filter->count = 0; | |
644 | wmb(); | |
645 | ||
646 | /* Use first set of addresses as an exact filter */ | |
647 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
648 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
649 | ||
650 | nexact = n; | |
651 | ||
cfbf84fc AW |
652 | /* Remaining multicast addresses are hashed, |
653 | * unicast will leave the filter disabled. */ | |
f271b2cc | 654 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
655 | for (; n < uf.count; n++) { |
656 | if (!is_multicast_ether_addr(addr[n].u)) { | |
657 | err = 0; /* no filter */ | |
658 | goto done; | |
659 | } | |
f271b2cc | 660 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 661 | } |
f271b2cc MK |
662 | |
663 | /* For ALLMULTI just set the mask to all ones. | |
664 | * This overrides the mask populated above. */ | |
665 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
666 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
667 | ||
668 | /* Now enable the filter */ | |
669 | wmb(); | |
670 | filter->count = nexact; | |
671 | ||
672 | /* Return the number of exact filters */ | |
673 | err = nexact; | |
674 | ||
675 | done: | |
676 | kfree(addr); | |
677 | return err; | |
678 | } | |
679 | ||
680 | /* Returns: 0 - drop, !=0 - accept */ | |
681 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
682 | { | |
683 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
684 | * at this point. */ | |
685 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
686 | int i; | |
687 | ||
688 | /* Exact match */ | |
689 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 690 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
691 | return 1; |
692 | ||
693 | /* Inexact match (multicast only) */ | |
694 | if (is_multicast_ether_addr(eh->h_dest)) | |
695 | return addr_hash_test(filter->mask, eh->h_dest); | |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
700 | /* | |
701 | * Checks whether the packet is accepted or not. | |
702 | * Returns: 0 - drop, !=0 - accept | |
703 | */ | |
704 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
705 | { | |
706 | if (!filter->count) | |
707 | return 1; | |
708 | ||
709 | return run_filter(filter, skb); | |
710 | } | |
711 | ||
1da177e4 LT |
712 | /* Network device part of the driver */ |
713 | ||
7282d491 | 714 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 715 | |
c70f1829 EB |
716 | /* Net device detach from fd. */ |
717 | static void tun_net_uninit(struct net_device *dev) | |
718 | { | |
c8d68e6b | 719 | tun_detach_all(dev); |
c70f1829 EB |
720 | } |
721 | ||
1da177e4 LT |
722 | /* Net device open. */ |
723 | static int tun_net_open(struct net_device *dev) | |
724 | { | |
c8d68e6b | 725 | netif_tx_start_all_queues(dev); |
1da177e4 LT |
726 | return 0; |
727 | } | |
728 | ||
729 | /* Net device close. */ | |
730 | static int tun_net_close(struct net_device *dev) | |
731 | { | |
c8d68e6b | 732 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
733 | return 0; |
734 | } | |
735 | ||
736 | /* Net device start xmit */ | |
424efe9c | 737 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
738 | { |
739 | struct tun_struct *tun = netdev_priv(dev); | |
c8d68e6b | 740 | int txq = skb->queue_mapping; |
6e914fc7 | 741 | struct tun_file *tfile; |
fa35864e | 742 | u32 numqueues = 0; |
1da177e4 | 743 | |
6e914fc7 | 744 | rcu_read_lock(); |
c8d68e6b | 745 | tfile = rcu_dereference(tun->tfiles[txq]); |
fa35864e | 746 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 747 | |
1da177e4 | 748 | /* Drop packet if interface is not attached */ |
fa35864e | 749 | if (txq >= numqueues) |
1da177e4 LT |
750 | goto drop; |
751 | ||
fa35864e | 752 | if (numqueues == 1) { |
9bc88939 TH |
753 | /* Select queue was not called for the skbuff, so we extract the |
754 | * RPS hash and save it into the flow_table here. | |
755 | */ | |
756 | __u32 rxhash; | |
757 | ||
758 | rxhash = skb_get_hash(skb); | |
759 | if (rxhash) { | |
760 | struct tun_flow_entry *e; | |
761 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], | |
762 | rxhash); | |
763 | if (e) | |
764 | tun_flow_save_rps_rxhash(e, rxhash); | |
765 | } | |
766 | } | |
767 | ||
6e914fc7 JW |
768 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
769 | ||
c8d68e6b JW |
770 | BUG_ON(!tfile); |
771 | ||
f271b2cc MK |
772 | /* Drop if the filter does not like it. |
773 | * This is a noop if the filter is disabled. | |
774 | * Filter can be enabled only for the TAP devices. */ | |
775 | if (!check_filter(&tun->txflt, skb)) | |
776 | goto drop; | |
777 | ||
54f968d6 JW |
778 | if (tfile->socket.sk->sk_filter && |
779 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
780 | goto drop; |
781 | ||
36fe8c09 | 782 | /* Limit the number of packets queued by dividing txq length with the |
c8d68e6b JW |
783 | * number of queues. |
784 | */ | |
fa35864e DC |
785 | if (skb_queue_len(&tfile->socket.sk->sk_receive_queue) * numqueues |
786 | >= dev->tx_queue_len) | |
5d097109 | 787 | goto drop; |
1da177e4 | 788 | |
7bf66305 JW |
789 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
790 | goto drop; | |
791 | ||
eda29772 RC |
792 | if (skb->sk) { |
793 | sock_tx_timestamp(skb->sk, &skb_shinfo(skb)->tx_flags); | |
794 | sw_tx_timestamp(skb); | |
795 | } | |
796 | ||
0110d6f2 | 797 | /* Orphan the skb - required as we might hang on to it |
7bf66305 JW |
798 | * for indefinite time. |
799 | */ | |
0110d6f2 MT |
800 | skb_orphan(skb); |
801 | ||
f8af75f3 ED |
802 | nf_reset(skb); |
803 | ||
f271b2cc | 804 | /* Enqueue packet */ |
54f968d6 | 805 | skb_queue_tail(&tfile->socket.sk->sk_receive_queue, skb); |
1da177e4 LT |
806 | |
807 | /* Notify and wake up reader process */ | |
54f968d6 JW |
808 | if (tfile->flags & TUN_FASYNC) |
809 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
9e641bdc | 810 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
6e914fc7 JW |
811 | |
812 | rcu_read_unlock(); | |
6ed10654 | 813 | return NETDEV_TX_OK; |
1da177e4 LT |
814 | |
815 | drop: | |
09f75cd7 | 816 | dev->stats.tx_dropped++; |
149d36f7 | 817 | skb_tx_error(skb); |
1da177e4 | 818 | kfree_skb(skb); |
6e914fc7 | 819 | rcu_read_unlock(); |
6ed10654 | 820 | return NETDEV_TX_OK; |
1da177e4 LT |
821 | } |
822 | ||
f271b2cc | 823 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 824 | { |
f271b2cc MK |
825 | /* |
826 | * This callback is supposed to deal with mc filter in | |
827 | * _rx_ path and has nothing to do with the _tx_ path. | |
828 | * In rx path we always accept everything userspace gives us. | |
829 | */ | |
1da177e4 LT |
830 | } |
831 | ||
4885a504 ES |
832 | #define MIN_MTU 68 |
833 | #define MAX_MTU 65535 | |
834 | ||
835 | static int | |
836 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
837 | { | |
838 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
839 | return -EINVAL; | |
840 | dev->mtu = new_mtu; | |
841 | return 0; | |
842 | } | |
843 | ||
c8f44aff MM |
844 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
845 | netdev_features_t features) | |
88255375 MM |
846 | { |
847 | struct tun_struct *tun = netdev_priv(dev); | |
848 | ||
849 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
850 | } | |
bebd097a NH |
851 | #ifdef CONFIG_NET_POLL_CONTROLLER |
852 | static void tun_poll_controller(struct net_device *dev) | |
853 | { | |
854 | /* | |
855 | * Tun only receives frames when: | |
856 | * 1) the char device endpoint gets data from user space | |
857 | * 2) the tun socket gets a sendmsg call from user space | |
92d4ea6e | 858 | * Since both of those are synchronous operations, we are guaranteed |
bebd097a | 859 | * never to have pending data when we poll for it |
92d4ea6e | 860 | * so there is nothing to do here but return. |
bebd097a NH |
861 | * We need this though so netpoll recognizes us as an interface that |
862 | * supports polling, which enables bridge devices in virt setups to | |
863 | * still use netconsole | |
864 | */ | |
865 | return; | |
866 | } | |
867 | #endif | |
758e43b7 | 868 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 869 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
870 | .ndo_open = tun_net_open, |
871 | .ndo_stop = tun_net_close, | |
00829823 | 872 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 873 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 874 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 875 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
876 | #ifdef CONFIG_NET_POLL_CONTROLLER |
877 | .ndo_poll_controller = tun_poll_controller, | |
878 | #endif | |
758e43b7 SH |
879 | }; |
880 | ||
881 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 882 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
883 | .ndo_open = tun_net_open, |
884 | .ndo_stop = tun_net_close, | |
00829823 | 885 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 886 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 887 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 888 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
889 | .ndo_set_mac_address = eth_mac_addr, |
890 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 891 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
892 | #ifdef CONFIG_NET_POLL_CONTROLLER |
893 | .ndo_poll_controller = tun_poll_controller, | |
894 | #endif | |
758e43b7 SH |
895 | }; |
896 | ||
944a1376 | 897 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
898 | { |
899 | int i; | |
900 | ||
96442e42 JW |
901 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
902 | INIT_HLIST_HEAD(&tun->flows[i]); | |
903 | ||
904 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
905 | setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); | |
906 | mod_timer(&tun->flow_gc_timer, | |
907 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
908 | } |
909 | ||
910 | static void tun_flow_uninit(struct tun_struct *tun) | |
911 | { | |
912 | del_timer_sync(&tun->flow_gc_timer); | |
913 | tun_flow_flush(tun); | |
96442e42 JW |
914 | } |
915 | ||
1da177e4 LT |
916 | /* Initialize net device. */ |
917 | static void tun_net_init(struct net_device *dev) | |
918 | { | |
919 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 920 | |
1da177e4 LT |
921 | switch (tun->flags & TUN_TYPE_MASK) { |
922 | case TUN_TUN_DEV: | |
758e43b7 SH |
923 | dev->netdev_ops = &tun_netdev_ops; |
924 | ||
1da177e4 LT |
925 | /* Point-to-Point TUN Device */ |
926 | dev->hard_header_len = 0; | |
927 | dev->addr_len = 0; | |
928 | dev->mtu = 1500; | |
929 | ||
930 | /* Zero header length */ | |
6aa20a22 | 931 | dev->type = ARPHRD_NONE; |
1da177e4 LT |
932 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
933 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ | |
934 | break; | |
935 | ||
936 | case TUN_TAP_DEV: | |
7a0a9608 | 937 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 938 | /* Ethernet TAP Device */ |
1da177e4 | 939 | ether_setup(dev); |
550fd08c | 940 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 941 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 942 | |
f2cedb63 | 943 | eth_hw_addr_random(dev); |
36226a8d | 944 | |
1da177e4 LT |
945 | dev->tx_queue_len = TUN_READQ_SIZE; /* We prefer our own queue length */ |
946 | break; | |
947 | } | |
948 | } | |
949 | ||
950 | /* Character device part */ | |
951 | ||
952 | /* Poll */ | |
c8d68e6b | 953 | static unsigned int tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 954 | { |
b2430de3 EB |
955 | struct tun_file *tfile = file->private_data; |
956 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 957 | struct sock *sk; |
33dccbb0 | 958 | unsigned int mask = 0; |
1da177e4 LT |
959 | |
960 | if (!tun) | |
eac9e902 | 961 | return POLLERR; |
1da177e4 | 962 | |
54f968d6 | 963 | sk = tfile->socket.sk; |
3c8a9c63 | 964 | |
6b8a66ee | 965 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 966 | |
9e641bdc | 967 | poll_wait(file, sk_sleep(sk), wait); |
6aa20a22 | 968 | |
89f56d1e | 969 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
1da177e4 LT |
970 | mask |= POLLIN | POLLRDNORM; |
971 | ||
33dccbb0 HX |
972 | if (sock_writeable(sk) || |
973 | (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) && | |
974 | sock_writeable(sk))) | |
975 | mask |= POLLOUT | POLLWRNORM; | |
976 | ||
c70f1829 EB |
977 | if (tun->dev->reg_state != NETREG_REGISTERED) |
978 | mask = POLLERR; | |
979 | ||
631ab46b | 980 | tun_put(tun); |
1da177e4 LT |
981 | return mask; |
982 | } | |
983 | ||
f42157cb RR |
984 | /* prepad is the amount to reserve at front. len is length after that. |
985 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 986 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 987 | size_t prepad, size_t len, |
988 | size_t linear, int noblock) | |
f42157cb | 989 | { |
54f968d6 | 990 | struct sock *sk = tfile->socket.sk; |
f42157cb | 991 | struct sk_buff *skb; |
33dccbb0 | 992 | int err; |
f42157cb RR |
993 | |
994 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 995 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 996 | linear = len; |
f42157cb | 997 | |
33dccbb0 | 998 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
28d64271 | 999 | &err, 0); |
f42157cb | 1000 | if (!skb) |
33dccbb0 | 1001 | return ERR_PTR(err); |
f42157cb RR |
1002 | |
1003 | skb_reserve(skb, prepad); | |
1004 | skb_put(skb, linear); | |
33dccbb0 HX |
1005 | skb->data_len = len - linear; |
1006 | skb->len += len - linear; | |
f42157cb RR |
1007 | |
1008 | return skb; | |
1009 | } | |
1010 | ||
1da177e4 | 1011 | /* Get packet from user space buffer */ |
54f968d6 JW |
1012 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
1013 | void *msg_control, const struct iovec *iv, | |
1014 | size_t total_len, size_t count, int noblock) | |
1da177e4 | 1015 | { |
09640e63 | 1016 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1017 | struct sk_buff *skb; |
3dd5c330 | 1018 | size_t len = total_len, align = NET_SKB_PAD, linear; |
f43798c2 | 1019 | struct virtio_net_hdr gso = { 0 }; |
96f8d9ec | 1020 | int good_linear; |
6f26c9a7 | 1021 | int offset = 0; |
0690899b MT |
1022 | int copylen; |
1023 | bool zerocopy = false; | |
1024 | int err; | |
49974420 | 1025 | u32 rxhash; |
1da177e4 LT |
1026 | |
1027 | if (!(tun->flags & TUN_NO_PI)) { | |
15718ea0 | 1028 | if (len < sizeof(pi)) |
1da177e4 | 1029 | return -EINVAL; |
15718ea0 | 1030 | len -= sizeof(pi); |
1da177e4 | 1031 | |
6f26c9a7 | 1032 | if (memcpy_fromiovecend((void *)&pi, iv, 0, sizeof(pi))) |
1da177e4 | 1033 | return -EFAULT; |
6f26c9a7 | 1034 | offset += sizeof(pi); |
1da177e4 LT |
1035 | } |
1036 | ||
f43798c2 | 1037 | if (tun->flags & TUN_VNET_HDR) { |
15718ea0 | 1038 | if (len < tun->vnet_hdr_sz) |
f43798c2 | 1039 | return -EINVAL; |
15718ea0 | 1040 | len -= tun->vnet_hdr_sz; |
f43798c2 | 1041 | |
6f26c9a7 | 1042 | if (memcpy_fromiovecend((void *)&gso, iv, offset, sizeof(gso))) |
f43798c2 RR |
1043 | return -EFAULT; |
1044 | ||
4909122f HX |
1045 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
1046 | gso.csum_start + gso.csum_offset + 2 > gso.hdr_len) | |
1047 | gso.hdr_len = gso.csum_start + gso.csum_offset + 2; | |
1048 | ||
f43798c2 RR |
1049 | if (gso.hdr_len > len) |
1050 | return -EINVAL; | |
d9d52b51 | 1051 | offset += tun->vnet_hdr_sz; |
f43798c2 RR |
1052 | } |
1053 | ||
e01bf1c8 | 1054 | if ((tun->flags & TUN_TYPE_MASK) == TUN_TAP_DEV) { |
a504b86e | 1055 | align += NET_IP_ALIGN; |
0eca93bc HX |
1056 | if (unlikely(len < ETH_HLEN || |
1057 | (gso.hdr_len && gso.hdr_len < ETH_HLEN))) | |
e01bf1c8 RR |
1058 | return -EINVAL; |
1059 | } | |
6aa20a22 | 1060 | |
96f8d9ec JW |
1061 | good_linear = SKB_MAX_HEAD(align); |
1062 | ||
88529176 JW |
1063 | if (msg_control) { |
1064 | /* There are 256 bytes to be copied in skb, so there is | |
1065 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1066 | * The rest of the buffer is mapped from userspace. |
1067 | */ | |
88529176 | 1068 | copylen = gso.hdr_len ? gso.hdr_len : GOODCOPY_LEN; |
96f8d9ec JW |
1069 | if (copylen > good_linear) |
1070 | copylen = good_linear; | |
3dd5c330 | 1071 | linear = copylen; |
88529176 JW |
1072 | if (iov_pages(iv, offset + copylen, count) <= MAX_SKB_FRAGS) |
1073 | zerocopy = true; | |
1074 | } | |
1075 | ||
1076 | if (!zerocopy) { | |
0690899b | 1077 | copylen = len; |
96f8d9ec JW |
1078 | if (gso.hdr_len > good_linear) |
1079 | linear = good_linear; | |
1080 | else | |
1081 | linear = gso.hdr_len; | |
3dd5c330 | 1082 | } |
0690899b | 1083 | |
3dd5c330 | 1084 | skb = tun_alloc_skb(tfile, align, copylen, linear, noblock); |
33dccbb0 HX |
1085 | if (IS_ERR(skb)) { |
1086 | if (PTR_ERR(skb) != -EAGAIN) | |
1087 | tun->dev->stats.rx_dropped++; | |
1088 | return PTR_ERR(skb); | |
1da177e4 LT |
1089 | } |
1090 | ||
0690899b MT |
1091 | if (zerocopy) |
1092 | err = zerocopy_sg_from_iovec(skb, iv, offset, count); | |
88529176 | 1093 | else { |
0690899b | 1094 | err = skb_copy_datagram_from_iovec(skb, 0, iv, offset, len); |
88529176 JW |
1095 | if (!err && msg_control) { |
1096 | struct ubuf_info *uarg = msg_control; | |
1097 | uarg->callback(uarg, false); | |
1098 | } | |
1099 | } | |
0690899b MT |
1100 | |
1101 | if (err) { | |
09f75cd7 | 1102 | tun->dev->stats.rx_dropped++; |
8f22757e | 1103 | kfree_skb(skb); |
1da177e4 | 1104 | return -EFAULT; |
8f22757e | 1105 | } |
1da177e4 | 1106 | |
f43798c2 RR |
1107 | if (gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) { |
1108 | if (!skb_partial_csum_set(skb, gso.csum_start, | |
1109 | gso.csum_offset)) { | |
1110 | tun->dev->stats.rx_frame_errors++; | |
1111 | kfree_skb(skb); | |
1112 | return -EINVAL; | |
1113 | } | |
88255375 | 1114 | } |
f43798c2 | 1115 | |
1da177e4 LT |
1116 | switch (tun->flags & TUN_TYPE_MASK) { |
1117 | case TUN_TUN_DEV: | |
f09f7ee2 AWC |
1118 | if (tun->flags & TUN_NO_PI) { |
1119 | switch (skb->data[0] & 0xf0) { | |
1120 | case 0x40: | |
1121 | pi.proto = htons(ETH_P_IP); | |
1122 | break; | |
1123 | case 0x60: | |
1124 | pi.proto = htons(ETH_P_IPV6); | |
1125 | break; | |
1126 | default: | |
1127 | tun->dev->stats.rx_dropped++; | |
1128 | kfree_skb(skb); | |
1129 | return -EINVAL; | |
1130 | } | |
1131 | } | |
1132 | ||
459a98ed | 1133 | skb_reset_mac_header(skb); |
1da177e4 | 1134 | skb->protocol = pi.proto; |
4c13eb66 | 1135 | skb->dev = tun->dev; |
1da177e4 LT |
1136 | break; |
1137 | case TUN_TAP_DEV: | |
1138 | skb->protocol = eth_type_trans(skb, tun->dev); | |
1139 | break; | |
6403eab1 | 1140 | } |
1da177e4 | 1141 | |
f43798c2 RR |
1142 | if (gso.gso_type != VIRTIO_NET_HDR_GSO_NONE) { |
1143 | pr_debug("GSO!\n"); | |
1144 | switch (gso.gso_type & ~VIRTIO_NET_HDR_GSO_ECN) { | |
1145 | case VIRTIO_NET_HDR_GSO_TCPV4: | |
c9af6db4 | 1146 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4; |
f43798c2 RR |
1147 | break; |
1148 | case VIRTIO_NET_HDR_GSO_TCPV6: | |
c9af6db4 | 1149 | skb_shinfo(skb)->gso_type = SKB_GSO_TCPV6; |
f43798c2 | 1150 | break; |
e36aa25a | 1151 | case VIRTIO_NET_HDR_GSO_UDP: |
c9af6db4 | 1152 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP; |
e36aa25a | 1153 | break; |
f43798c2 RR |
1154 | default: |
1155 | tun->dev->stats.rx_frame_errors++; | |
1156 | kfree_skb(skb); | |
1157 | return -EINVAL; | |
1158 | } | |
1159 | ||
1160 | if (gso.gso_type & VIRTIO_NET_HDR_GSO_ECN) | |
c9af6db4 | 1161 | skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN; |
f43798c2 RR |
1162 | |
1163 | skb_shinfo(skb)->gso_size = gso.gso_size; | |
1164 | if (skb_shinfo(skb)->gso_size == 0) { | |
1165 | tun->dev->stats.rx_frame_errors++; | |
1166 | kfree_skb(skb); | |
1167 | return -EINVAL; | |
1168 | } | |
1169 | ||
1170 | /* Header must be checked, and gso_segs computed. */ | |
1171 | skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY; | |
1172 | skb_shinfo(skb)->gso_segs = 0; | |
1173 | } | |
6aa20a22 | 1174 | |
0690899b MT |
1175 | /* copy skb_ubuf_info for callback when skb has no error */ |
1176 | if (zerocopy) { | |
1177 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1178 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
c9af6db4 | 1179 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
0690899b MT |
1180 | } |
1181 | ||
76fe4581 | 1182 | skb_reset_network_header(skb); |
40893fd0 | 1183 | skb_probe_transport_header(skb, 0); |
38502af7 | 1184 | |
3958afa1 | 1185 | rxhash = skb_get_hash(skb); |
1da177e4 | 1186 | netif_rx_ni(skb); |
6aa20a22 | 1187 | |
09f75cd7 JG |
1188 | tun->dev->stats.rx_packets++; |
1189 | tun->dev->stats.rx_bytes += len; | |
1da177e4 | 1190 | |
9e85722d | 1191 | tun_flow_update(tun, rxhash, tfile); |
0690899b | 1192 | return total_len; |
6aa20a22 | 1193 | } |
1da177e4 | 1194 | |
ee0b3e67 BP |
1195 | static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv, |
1196 | unsigned long count, loff_t pos) | |
1da177e4 | 1197 | { |
33dccbb0 | 1198 | struct file *file = iocb->ki_filp; |
ab46d779 | 1199 | struct tun_struct *tun = tun_get(file); |
54f968d6 | 1200 | struct tun_file *tfile = file->private_data; |
631ab46b | 1201 | ssize_t result; |
1da177e4 LT |
1202 | |
1203 | if (!tun) | |
1204 | return -EBADFD; | |
1205 | ||
6b8a66ee | 1206 | tun_debug(KERN_INFO, tun, "tun_chr_write %ld\n", count); |
1da177e4 | 1207 | |
54f968d6 JW |
1208 | result = tun_get_user(tun, tfile, NULL, iv, iov_length(iv, count), |
1209 | count, file->f_flags & O_NONBLOCK); | |
631ab46b EB |
1210 | |
1211 | tun_put(tun); | |
1212 | return result; | |
1da177e4 LT |
1213 | } |
1214 | ||
1da177e4 | 1215 | /* Put packet to the user space buffer */ |
6f7c156c | 1216 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 1217 | struct tun_file *tfile, |
6f7c156c | 1218 | struct sk_buff *skb, |
1219 | const struct iovec *iv, int len) | |
1da177e4 LT |
1220 | { |
1221 | struct tun_pi pi = { 0, skb->protocol }; | |
1222 | ssize_t total = 0; | |
e6fd07c8 | 1223 | int vlan_offset = 0, copied; |
1da177e4 LT |
1224 | |
1225 | if (!(tun->flags & TUN_NO_PI)) { | |
1226 | if ((len -= sizeof(pi)) < 0) | |
1227 | return -EINVAL; | |
1228 | ||
1229 | if (len < skb->len) { | |
1230 | /* Packet will be striped */ | |
1231 | pi.flags |= TUN_PKT_STRIP; | |
1232 | } | |
6aa20a22 | 1233 | |
43b39dcd | 1234 | if (memcpy_toiovecend(iv, (void *) &pi, 0, sizeof(pi))) |
1da177e4 LT |
1235 | return -EFAULT; |
1236 | total += sizeof(pi); | |
6aa20a22 | 1237 | } |
1da177e4 | 1238 | |
f43798c2 RR |
1239 | if (tun->flags & TUN_VNET_HDR) { |
1240 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ | |
d9d52b51 | 1241 | if ((len -= tun->vnet_hdr_sz) < 0) |
f43798c2 RR |
1242 | return -EINVAL; |
1243 | ||
1244 | if (skb_is_gso(skb)) { | |
1245 | struct skb_shared_info *sinfo = skb_shinfo(skb); | |
1246 | ||
1247 | /* This is a hint as to how much should be linear. */ | |
1248 | gso.hdr_len = skb_headlen(skb); | |
1249 | gso.gso_size = sinfo->gso_size; | |
1250 | if (sinfo->gso_type & SKB_GSO_TCPV4) | |
1251 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV4; | |
1252 | else if (sinfo->gso_type & SKB_GSO_TCPV6) | |
1253 | gso.gso_type = VIRTIO_NET_HDR_GSO_TCPV6; | |
e36aa25a SS |
1254 | else if (sinfo->gso_type & SKB_GSO_UDP) |
1255 | gso.gso_type = VIRTIO_NET_HDR_GSO_UDP; | |
ef3db4a5 | 1256 | else { |
6b8a66ee | 1257 | pr_err("unexpected GSO type: " |
ef3db4a5 MT |
1258 | "0x%x, gso_size %d, hdr_len %d\n", |
1259 | sinfo->gso_type, gso.gso_size, | |
1260 | gso.hdr_len); | |
1261 | print_hex_dump(KERN_ERR, "tun: ", | |
1262 | DUMP_PREFIX_NONE, | |
1263 | 16, 1, skb->head, | |
1264 | min((int)gso.hdr_len, 64), true); | |
1265 | WARN_ON_ONCE(1); | |
1266 | return -EINVAL; | |
1267 | } | |
f43798c2 RR |
1268 | if (sinfo->gso_type & SKB_GSO_TCP_ECN) |
1269 | gso.gso_type |= VIRTIO_NET_HDR_GSO_ECN; | |
1270 | } else | |
1271 | gso.gso_type = VIRTIO_NET_HDR_GSO_NONE; | |
1272 | ||
1273 | if (skb->ip_summed == CHECKSUM_PARTIAL) { | |
1274 | gso.flags = VIRTIO_NET_HDR_F_NEEDS_CSUM; | |
55508d60 | 1275 | gso.csum_start = skb_checksum_start_offset(skb); |
f43798c2 | 1276 | gso.csum_offset = skb->csum_offset; |
10a8d94a JW |
1277 | } else if (skb->ip_summed == CHECKSUM_UNNECESSARY) { |
1278 | gso.flags = VIRTIO_NET_HDR_F_DATA_VALID; | |
f43798c2 RR |
1279 | } /* else everything is zero */ |
1280 | ||
43b39dcd MT |
1281 | if (unlikely(memcpy_toiovecend(iv, (void *)&gso, total, |
1282 | sizeof(gso)))) | |
f43798c2 | 1283 | return -EFAULT; |
d9d52b51 | 1284 | total += tun->vnet_hdr_sz; |
f43798c2 RR |
1285 | } |
1286 | ||
e6fd07c8 JW |
1287 | copied = total; |
1288 | total += skb->len; | |
6680ec68 JW |
1289 | if (!vlan_tx_tag_present(skb)) { |
1290 | len = min_t(int, skb->len, len); | |
1291 | } else { | |
1292 | int copy, ret; | |
1293 | struct { | |
1294 | __be16 h_vlan_proto; | |
1295 | __be16 h_vlan_TCI; | |
1296 | } veth; | |
1297 | ||
1298 | veth.h_vlan_proto = skb->vlan_proto; | |
1299 | veth.h_vlan_TCI = htons(vlan_tx_tag_get(skb)); | |
1300 | ||
1301 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
1302 | len = min_t(int, skb->len + VLAN_HLEN, len); | |
e6fd07c8 | 1303 | total += VLAN_HLEN; |
6680ec68 JW |
1304 | |
1305 | copy = min_t(int, vlan_offset, len); | |
e6fd07c8 | 1306 | ret = skb_copy_datagram_const_iovec(skb, 0, iv, copied, copy); |
6680ec68 | 1307 | len -= copy; |
e6fd07c8 | 1308 | copied += copy; |
6680ec68 JW |
1309 | if (ret || !len) |
1310 | goto done; | |
1311 | ||
1312 | copy = min_t(int, sizeof(veth), len); | |
e6fd07c8 | 1313 | ret = memcpy_toiovecend(iv, (void *)&veth, copied, copy); |
6680ec68 | 1314 | len -= copy; |
e6fd07c8 | 1315 | copied += copy; |
6680ec68 JW |
1316 | if (ret || !len) |
1317 | goto done; | |
1318 | } | |
1da177e4 | 1319 | |
e6fd07c8 | 1320 | skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len); |
1da177e4 | 1321 | |
6680ec68 | 1322 | done: |
09f75cd7 JG |
1323 | tun->dev->stats.tx_packets++; |
1324 | tun->dev->stats.tx_bytes += len; | |
1da177e4 LT |
1325 | |
1326 | return total; | |
1327 | } | |
1328 | ||
54f968d6 | 1329 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
f96eb74c | 1330 | const struct iovec *iv, ssize_t len, int noblock) |
1da177e4 | 1331 | { |
1da177e4 | 1332 | struct sk_buff *skb; |
05c2828c | 1333 | ssize_t ret = 0; |
9e641bdc | 1334 | int peeked, err, off = 0; |
1da177e4 | 1335 | |
3872baf6 | 1336 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 1337 | |
9e641bdc XW |
1338 | if (!len) |
1339 | return ret; | |
1da177e4 | 1340 | |
9e641bdc XW |
1341 | if (tun->dev->reg_state != NETREG_REGISTERED) |
1342 | return -EIO; | |
1da177e4 | 1343 | |
9e641bdc XW |
1344 | /* Read frames from queue */ |
1345 | skb = __skb_recv_datagram(tfile->socket.sk, noblock ? MSG_DONTWAIT : 0, | |
1346 | &peeked, &off, &err); | |
1347 | if (skb) { | |
54f968d6 | 1348 | ret = tun_put_user(tun, tfile, skb, iv, len); |
f271b2cc | 1349 | kfree_skb(skb); |
9e641bdc XW |
1350 | } else |
1351 | ret = err; | |
1da177e4 | 1352 | |
05c2828c MT |
1353 | return ret; |
1354 | } | |
1355 | ||
1356 | static ssize_t tun_chr_aio_read(struct kiocb *iocb, const struct iovec *iv, | |
1357 | unsigned long count, loff_t pos) | |
1358 | { | |
1359 | struct file *file = iocb->ki_filp; | |
1360 | struct tun_file *tfile = file->private_data; | |
1361 | struct tun_struct *tun = __tun_get(tfile); | |
1362 | ssize_t len, ret; | |
1363 | ||
1364 | if (!tun) | |
1365 | return -EBADFD; | |
1366 | len = iov_length(iv, count); | |
1367 | if (len < 0) { | |
1368 | ret = -EINVAL; | |
1369 | goto out; | |
1370 | } | |
1371 | ||
f96eb74c | 1372 | ret = tun_do_read(tun, tfile, iv, len, |
54f968d6 | 1373 | file->f_flags & O_NONBLOCK); |
42404c09 | 1374 | ret = min_t(ssize_t, ret, len); |
d0b7da8a ZYW |
1375 | if (ret > 0) |
1376 | iocb->ki_pos = ret; | |
631ab46b EB |
1377 | out: |
1378 | tun_put(tun); | |
1da177e4 LT |
1379 | return ret; |
1380 | } | |
1381 | ||
96442e42 JW |
1382 | static void tun_free_netdev(struct net_device *dev) |
1383 | { | |
1384 | struct tun_struct *tun = netdev_priv(dev); | |
1385 | ||
4008e97f | 1386 | BUG_ON(!(list_empty(&tun->disabled))); |
96442e42 | 1387 | tun_flow_uninit(tun); |
5dbbaf2d | 1388 | security_tun_dev_free_security(tun->security); |
96442e42 JW |
1389 | free_netdev(dev); |
1390 | } | |
1391 | ||
1da177e4 LT |
1392 | static void tun_setup(struct net_device *dev) |
1393 | { | |
1394 | struct tun_struct *tun = netdev_priv(dev); | |
1395 | ||
0625c883 EB |
1396 | tun->owner = INVALID_UID; |
1397 | tun->group = INVALID_GID; | |
1da177e4 | 1398 | |
1da177e4 | 1399 | dev->ethtool_ops = &tun_ethtool_ops; |
96442e42 | 1400 | dev->destructor = tun_free_netdev; |
1da177e4 LT |
1401 | } |
1402 | ||
f019a7a5 EB |
1403 | /* Trivial set of netlink ops to allow deleting tun or tap |
1404 | * device with netlink. | |
1405 | */ | |
1406 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1407 | { | |
1408 | return -EINVAL; | |
1409 | } | |
1410 | ||
1411 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1412 | .kind = DRV_NAME, | |
1413 | .priv_size = sizeof(struct tun_struct), | |
1414 | .setup = tun_setup, | |
1415 | .validate = tun_validate, | |
1416 | }; | |
1417 | ||
33dccbb0 HX |
1418 | static void tun_sock_write_space(struct sock *sk) |
1419 | { | |
54f968d6 | 1420 | struct tun_file *tfile; |
43815482 | 1421 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1422 | |
1423 | if (!sock_writeable(sk)) | |
1424 | return; | |
1425 | ||
33dccbb0 HX |
1426 | if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
1427 | return; | |
1428 | ||
43815482 ED |
1429 | wqueue = sk_sleep(sk); |
1430 | if (wqueue && waitqueue_active(wqueue)) | |
1431 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1432 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1433 | |
54f968d6 JW |
1434 | tfile = container_of(sk, struct tun_file, sk); |
1435 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
1436 | } |
1437 | ||
05c2828c MT |
1438 | static int tun_sendmsg(struct kiocb *iocb, struct socket *sock, |
1439 | struct msghdr *m, size_t total_len) | |
1440 | { | |
54f968d6 JW |
1441 | int ret; |
1442 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1443 | struct tun_struct *tun = __tun_get(tfile); | |
1444 | ||
1445 | if (!tun) | |
1446 | return -EBADFD; | |
54f968d6 JW |
1447 | ret = tun_get_user(tun, tfile, m->msg_control, m->msg_iov, total_len, |
1448 | m->msg_iovlen, m->msg_flags & MSG_DONTWAIT); | |
1449 | tun_put(tun); | |
1450 | return ret; | |
05c2828c MT |
1451 | } |
1452 | ||
1453 | static int tun_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1454 | struct msghdr *m, size_t total_len, | |
1455 | int flags) | |
1456 | { | |
54f968d6 JW |
1457 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
1458 | struct tun_struct *tun = __tun_get(tfile); | |
05c2828c | 1459 | int ret; |
54f968d6 JW |
1460 | |
1461 | if (!tun) | |
1462 | return -EBADFD; | |
1463 | ||
eda29772 | 1464 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
3811ae76 G |
1465 | ret = -EINVAL; |
1466 | goto out; | |
1467 | } | |
eda29772 RC |
1468 | if (flags & MSG_ERRQUEUE) { |
1469 | ret = sock_recv_errqueue(sock->sk, m, total_len, | |
1470 | SOL_PACKET, TUN_TX_TIMESTAMP); | |
1471 | goto out; | |
1472 | } | |
f96eb74c | 1473 | ret = tun_do_read(tun, tfile, m->msg_iov, total_len, |
05c2828c | 1474 | flags & MSG_DONTWAIT); |
42404c09 DM |
1475 | if (ret > total_len) { |
1476 | m->msg_flags |= MSG_TRUNC; | |
1477 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1478 | } | |
3811ae76 | 1479 | out: |
54f968d6 | 1480 | tun_put(tun); |
05c2828c MT |
1481 | return ret; |
1482 | } | |
1483 | ||
1ab5ecb9 SK |
1484 | static int tun_release(struct socket *sock) |
1485 | { | |
1486 | if (sock->sk) | |
1487 | sock_put(sock->sk); | |
1488 | return 0; | |
1489 | } | |
1490 | ||
05c2828c MT |
1491 | /* Ops structure to mimic raw sockets with tun */ |
1492 | static const struct proto_ops tun_socket_ops = { | |
1493 | .sendmsg = tun_sendmsg, | |
1494 | .recvmsg = tun_recvmsg, | |
1ab5ecb9 | 1495 | .release = tun_release, |
05c2828c MT |
1496 | }; |
1497 | ||
33dccbb0 HX |
1498 | static struct proto tun_proto = { |
1499 | .name = "tun", | |
1500 | .owner = THIS_MODULE, | |
54f968d6 | 1501 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 1502 | }; |
f019a7a5 | 1503 | |
980c9e8c DW |
1504 | static int tun_flags(struct tun_struct *tun) |
1505 | { | |
1506 | int flags = 0; | |
1507 | ||
1508 | if (tun->flags & TUN_TUN_DEV) | |
1509 | flags |= IFF_TUN; | |
1510 | else | |
1511 | flags |= IFF_TAP; | |
1512 | ||
1513 | if (tun->flags & TUN_NO_PI) | |
1514 | flags |= IFF_NO_PI; | |
1515 | ||
5d097109 MT |
1516 | /* This flag has no real effect. We track the value for backwards |
1517 | * compatibility. | |
1518 | */ | |
980c9e8c DW |
1519 | if (tun->flags & TUN_ONE_QUEUE) |
1520 | flags |= IFF_ONE_QUEUE; | |
1521 | ||
1522 | if (tun->flags & TUN_VNET_HDR) | |
1523 | flags |= IFF_VNET_HDR; | |
1524 | ||
c8d68e6b JW |
1525 | if (tun->flags & TUN_TAP_MQ) |
1526 | flags |= IFF_MULTI_QUEUE; | |
1527 | ||
274038f8 PE |
1528 | if (tun->flags & TUN_PERSIST) |
1529 | flags |= IFF_PERSIST; | |
1530 | ||
980c9e8c DW |
1531 | return flags; |
1532 | } | |
1533 | ||
1534 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1535 | char *buf) | |
1536 | { | |
1537 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1538 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1539 | } | |
1540 | ||
1541 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1542 | char *buf) | |
1543 | { | |
1544 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1545 | return uid_valid(tun->owner)? |
1546 | sprintf(buf, "%u\n", | |
1547 | from_kuid_munged(current_user_ns(), tun->owner)): | |
1548 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1549 | } |
1550 | ||
1551 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1552 | char *buf) | |
1553 | { | |
1554 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1555 | return gid_valid(tun->group) ? |
1556 | sprintf(buf, "%u\n", | |
1557 | from_kgid_munged(current_user_ns(), tun->group)): | |
1558 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1559 | } |
1560 | ||
1561 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1562 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1563 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1564 | ||
d647a591 | 1565 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
1566 | { |
1567 | struct tun_struct *tun; | |
54f968d6 | 1568 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
1569 | struct net_device *dev; |
1570 | int err; | |
1571 | ||
7c0c3b1a JW |
1572 | if (tfile->detached) |
1573 | return -EINVAL; | |
1574 | ||
74a3e5a7 EB |
1575 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1576 | if (dev) { | |
f85ba780 DW |
1577 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1578 | return -EBUSY; | |
74a3e5a7 EB |
1579 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1580 | tun = netdev_priv(dev); | |
1581 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1582 | tun = netdev_priv(dev); | |
1583 | else | |
1584 | return -EINVAL; | |
1585 | ||
8e6d91ae JW |
1586 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
1587 | !!(tun->flags & TUN_TAP_MQ)) | |
1588 | return -EINVAL; | |
1589 | ||
cde8b15f | 1590 | if (tun_not_capable(tun)) |
2b980dbd | 1591 | return -EPERM; |
5dbbaf2d | 1592 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
1593 | if (err < 0) |
1594 | return err; | |
1595 | ||
849c9b6f | 1596 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER); |
a7385ba2 EB |
1597 | if (err < 0) |
1598 | return err; | |
4008e97f JW |
1599 | |
1600 | if (tun->flags & TUN_TAP_MQ && | |
e8dbad66 JW |
1601 | (tun->numqueues + tun->numdisabled > 1)) { |
1602 | /* One or more queue has already been attached, no need | |
1603 | * to initialize the device again. | |
1604 | */ | |
1605 | return 0; | |
1606 | } | |
6aa20a22 | 1607 | } |
1da177e4 LT |
1608 | else { |
1609 | char *name; | |
1610 | unsigned long flags = 0; | |
edfb6a14 JW |
1611 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
1612 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 1613 | |
c260b772 | 1614 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 1615 | return -EPERM; |
2b980dbd PM |
1616 | err = security_tun_dev_create(); |
1617 | if (err < 0) | |
1618 | return err; | |
ca6bb5d7 | 1619 | |
1da177e4 LT |
1620 | /* Set dev type */ |
1621 | if (ifr->ifr_flags & IFF_TUN) { | |
1622 | /* TUN device */ | |
1623 | flags |= TUN_TUN_DEV; | |
1624 | name = "tun%d"; | |
1625 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1626 | /* TAP device */ | |
1627 | flags |= TUN_TAP_DEV; | |
1628 | name = "tap%d"; | |
6aa20a22 | 1629 | } else |
36989b90 | 1630 | return -EINVAL; |
6aa20a22 | 1631 | |
1da177e4 LT |
1632 | if (*ifr->ifr_name) |
1633 | name = ifr->ifr_name; | |
1634 | ||
c8d68e6b | 1635 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
edfb6a14 JW |
1636 | tun_setup, queues, queues); |
1637 | ||
1da177e4 LT |
1638 | if (!dev) |
1639 | return -ENOMEM; | |
1640 | ||
fc54c658 | 1641 | dev_net_set(dev, net); |
f019a7a5 | 1642 | dev->rtnl_link_ops = &tun_link_ops; |
fb7589a1 | 1643 | dev->ifindex = tfile->ifindex; |
758e43b7 | 1644 | |
1da177e4 LT |
1645 | tun = netdev_priv(dev); |
1646 | tun->dev = dev; | |
1647 | tun->flags = flags; | |
f271b2cc | 1648 | tun->txflt.count = 0; |
d9d52b51 | 1649 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 1650 | |
54f968d6 JW |
1651 | tun->filter_attached = false; |
1652 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
33dccbb0 | 1653 | |
96442e42 JW |
1654 | spin_lock_init(&tun->lock); |
1655 | ||
5dbbaf2d PM |
1656 | err = security_tun_dev_alloc_security(&tun->security); |
1657 | if (err < 0) | |
1658 | goto err_free_dev; | |
2b980dbd | 1659 | |
1da177e4 | 1660 | tun_net_init(dev); |
944a1376 | 1661 | tun_flow_init(tun); |
96442e42 | 1662 | |
88255375 | 1663 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
6680ec68 JW |
1664 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
1665 | NETIF_F_HW_VLAN_STAG_TX; | |
88255375 | 1666 | dev->features = dev->hw_features; |
6671b224 FLVC |
1667 | dev->vlan_features = dev->features & |
1668 | ~(NETIF_F_HW_VLAN_CTAG_TX | | |
1669 | NETIF_F_HW_VLAN_STAG_TX); | |
88255375 | 1670 | |
4008e97f | 1671 | INIT_LIST_HEAD(&tun->disabled); |
849c9b6f | 1672 | err = tun_attach(tun, file, false); |
eb0fb363 | 1673 | if (err < 0) |
662ca437 | 1674 | goto err_free_flow; |
eb0fb363 | 1675 | |
1da177e4 LT |
1676 | err = register_netdevice(tun->dev); |
1677 | if (err < 0) | |
662ca437 | 1678 | goto err_detach; |
9c3fea6a | 1679 | |
980c9e8c DW |
1680 | if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) || |
1681 | device_create_file(&tun->dev->dev, &dev_attr_owner) || | |
1682 | device_create_file(&tun->dev->dev, &dev_attr_group)) | |
6b8a66ee | 1683 | pr_err("Failed to create tun sysfs files\n"); |
1da177e4 LT |
1684 | } |
1685 | ||
af668b3c MT |
1686 | netif_carrier_on(tun->dev); |
1687 | ||
6b8a66ee | 1688 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 LT |
1689 | |
1690 | if (ifr->ifr_flags & IFF_NO_PI) | |
1691 | tun->flags |= TUN_NO_PI; | |
a26af1e0 NF |
1692 | else |
1693 | tun->flags &= ~TUN_NO_PI; | |
1da177e4 | 1694 | |
5d097109 MT |
1695 | /* This flag has no real effect. We track the value for backwards |
1696 | * compatibility. | |
1697 | */ | |
1da177e4 LT |
1698 | if (ifr->ifr_flags & IFF_ONE_QUEUE) |
1699 | tun->flags |= TUN_ONE_QUEUE; | |
a26af1e0 NF |
1700 | else |
1701 | tun->flags &= ~TUN_ONE_QUEUE; | |
1da177e4 | 1702 | |
f43798c2 RR |
1703 | if (ifr->ifr_flags & IFF_VNET_HDR) |
1704 | tun->flags |= TUN_VNET_HDR; | |
1705 | else | |
1706 | tun->flags &= ~TUN_VNET_HDR; | |
1707 | ||
c8d68e6b JW |
1708 | if (ifr->ifr_flags & IFF_MULTI_QUEUE) |
1709 | tun->flags |= TUN_TAP_MQ; | |
1710 | else | |
1711 | tun->flags &= ~TUN_TAP_MQ; | |
1712 | ||
e35259a9 MK |
1713 | /* Make sure persistent devices do not get stuck in |
1714 | * xoff state. | |
1715 | */ | |
1716 | if (netif_running(tun->dev)) | |
c8d68e6b | 1717 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 1718 | |
1da177e4 LT |
1719 | strcpy(ifr->ifr_name, tun->dev->name); |
1720 | return 0; | |
1721 | ||
662ca437 JW |
1722 | err_detach: |
1723 | tun_detach_all(dev); | |
1724 | err_free_flow: | |
1725 | tun_flow_uninit(tun); | |
1726 | security_tun_dev_free_security(tun->security); | |
1727 | err_free_dev: | |
1da177e4 | 1728 | free_netdev(dev); |
1da177e4 LT |
1729 | return err; |
1730 | } | |
1731 | ||
9ce99cf6 | 1732 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 1733 | struct ifreq *ifr) |
e3b99556 | 1734 | { |
6b8a66ee | 1735 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1736 | |
1737 | strcpy(ifr->ifr_name, tun->dev->name); | |
1738 | ||
980c9e8c | 1739 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 1740 | |
e3b99556 MM |
1741 | } |
1742 | ||
5228ddc9 RR |
1743 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1744 | * privs required. */ | |
88255375 | 1745 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1746 | { |
c8f44aff | 1747 | netdev_features_t features = 0; |
5228ddc9 RR |
1748 | |
1749 | if (arg & TUN_F_CSUM) { | |
88255375 | 1750 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1751 | arg &= ~TUN_F_CSUM; |
1752 | ||
1753 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1754 | if (arg & TUN_F_TSO_ECN) { | |
1755 | features |= NETIF_F_TSO_ECN; | |
1756 | arg &= ~TUN_F_TSO_ECN; | |
1757 | } | |
1758 | if (arg & TUN_F_TSO4) | |
1759 | features |= NETIF_F_TSO; | |
1760 | if (arg & TUN_F_TSO6) | |
1761 | features |= NETIF_F_TSO6; | |
1762 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1763 | } | |
e36aa25a SS |
1764 | |
1765 | if (arg & TUN_F_UFO) { | |
1766 | features |= NETIF_F_UFO; | |
1767 | arg &= ~TUN_F_UFO; | |
1768 | } | |
5228ddc9 RR |
1769 | } |
1770 | ||
1771 | /* This gives the user a way to test for new features in future by | |
1772 | * trying to set them. */ | |
1773 | if (arg) | |
1774 | return -EINVAL; | |
1775 | ||
88255375 MM |
1776 | tun->set_features = features; |
1777 | netdev_update_features(tun->dev); | |
5228ddc9 RR |
1778 | |
1779 | return 0; | |
1780 | } | |
1781 | ||
c8d68e6b JW |
1782 | static void tun_detach_filter(struct tun_struct *tun, int n) |
1783 | { | |
1784 | int i; | |
1785 | struct tun_file *tfile; | |
1786 | ||
1787 | for (i = 0; i < n; i++) { | |
b8deabd3 | 1788 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1789 | sk_detach_filter(tfile->socket.sk); |
1790 | } | |
1791 | ||
1792 | tun->filter_attached = false; | |
1793 | } | |
1794 | ||
1795 | static int tun_attach_filter(struct tun_struct *tun) | |
1796 | { | |
1797 | int i, ret = 0; | |
1798 | struct tun_file *tfile; | |
1799 | ||
1800 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1801 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1802 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); |
1803 | if (ret) { | |
1804 | tun_detach_filter(tun, i); | |
1805 | return ret; | |
1806 | } | |
1807 | } | |
1808 | ||
1809 | tun->filter_attached = true; | |
1810 | return ret; | |
1811 | } | |
1812 | ||
1813 | static void tun_set_sndbuf(struct tun_struct *tun) | |
1814 | { | |
1815 | struct tun_file *tfile; | |
1816 | int i; | |
1817 | ||
1818 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1819 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1820 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
1821 | } | |
1822 | } | |
1823 | ||
cde8b15f JW |
1824 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
1825 | { | |
1826 | struct tun_file *tfile = file->private_data; | |
1827 | struct tun_struct *tun; | |
cde8b15f JW |
1828 | int ret = 0; |
1829 | ||
1830 | rtnl_lock(); | |
1831 | ||
1832 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 1833 | tun = tfile->detached; |
5dbbaf2d | 1834 | if (!tun) { |
cde8b15f | 1835 | ret = -EINVAL; |
5dbbaf2d PM |
1836 | goto unlock; |
1837 | } | |
1838 | ret = security_tun_dev_attach_queue(tun->security); | |
1839 | if (ret < 0) | |
1840 | goto unlock; | |
849c9b6f | 1841 | ret = tun_attach(tun, file, false); |
4008e97f | 1842 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 1843 | tun = rtnl_dereference(tfile->tun); |
9e85722d | 1844 | if (!tun || !(tun->flags & TUN_TAP_MQ) || tfile->detached) |
4008e97f JW |
1845 | ret = -EINVAL; |
1846 | else | |
1847 | __tun_detach(tfile, false); | |
1848 | } else | |
cde8b15f JW |
1849 | ret = -EINVAL; |
1850 | ||
5dbbaf2d | 1851 | unlock: |
cde8b15f JW |
1852 | rtnl_unlock(); |
1853 | return ret; | |
1854 | } | |
1855 | ||
50857e2a AB |
1856 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1857 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1858 | { |
36b50bab | 1859 | struct tun_file *tfile = file->private_data; |
631ab46b | 1860 | struct tun_struct *tun; |
1da177e4 LT |
1861 | void __user* argp = (void __user*)arg; |
1862 | struct ifreq ifr; | |
0625c883 EB |
1863 | kuid_t owner; |
1864 | kgid_t group; | |
33dccbb0 | 1865 | int sndbuf; |
d9d52b51 | 1866 | int vnet_hdr_sz; |
fb7589a1 | 1867 | unsigned int ifindex; |
f271b2cc | 1868 | int ret; |
1da177e4 | 1869 | |
cde8b15f | 1870 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) { |
50857e2a | 1871 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 1872 | return -EFAULT; |
8bbb1813 | 1873 | } else { |
a117dacd | 1874 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 1875 | } |
631ab46b EB |
1876 | if (cmd == TUNGETFEATURES) { |
1877 | /* Currently this just means: "what IFF flags are valid?". | |
1878 | * This is needed because we never checked for invalid flags on | |
1879 | * TUNSETIFF. */ | |
1880 | return put_user(IFF_TUN | IFF_TAP | IFF_NO_PI | IFF_ONE_QUEUE | | |
cde8b15f | 1881 | IFF_VNET_HDR | IFF_MULTI_QUEUE, |
631ab46b | 1882 | (unsigned int __user*)argp); |
cde8b15f JW |
1883 | } else if (cmd == TUNSETQUEUE) |
1884 | return tun_set_queue(file, &ifr); | |
631ab46b | 1885 | |
c8d68e6b | 1886 | ret = 0; |
876bfd4d HX |
1887 | rtnl_lock(); |
1888 | ||
36b50bab | 1889 | tun = __tun_get(tfile); |
1da177e4 | 1890 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
1891 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
1892 | ||
876bfd4d | 1893 | ret = tun_set_iff(tfile->net, file, &ifr); |
1da177e4 | 1894 | |
876bfd4d HX |
1895 | if (ret) |
1896 | goto unlock; | |
1da177e4 | 1897 | |
50857e2a | 1898 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
1899 | ret = -EFAULT; |
1900 | goto unlock; | |
1da177e4 | 1901 | } |
fb7589a1 PE |
1902 | if (cmd == TUNSETIFINDEX) { |
1903 | ret = -EPERM; | |
1904 | if (tun) | |
1905 | goto unlock; | |
1906 | ||
1907 | ret = -EFAULT; | |
1908 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) | |
1909 | goto unlock; | |
1910 | ||
1911 | ret = 0; | |
1912 | tfile->ifindex = ifindex; | |
1913 | goto unlock; | |
1914 | } | |
1da177e4 | 1915 | |
876bfd4d | 1916 | ret = -EBADFD; |
1da177e4 | 1917 | if (!tun) |
876bfd4d | 1918 | goto unlock; |
1da177e4 | 1919 | |
1e588338 | 1920 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 1921 | |
631ab46b | 1922 | ret = 0; |
1da177e4 | 1923 | switch (cmd) { |
e3b99556 | 1924 | case TUNGETIFF: |
9ce99cf6 | 1925 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 1926 | |
3d407a80 PE |
1927 | if (tfile->detached) |
1928 | ifr.ifr_flags |= IFF_DETACH_QUEUE; | |
849c9b6f PE |
1929 | if (!tfile->socket.sk->sk_filter) |
1930 | ifr.ifr_flags |= IFF_NOFILTER; | |
3d407a80 | 1931 | |
50857e2a | 1932 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 1933 | ret = -EFAULT; |
e3b99556 MM |
1934 | break; |
1935 | ||
1da177e4 LT |
1936 | case TUNSETNOCSUM: |
1937 | /* Disable/Enable checksum */ | |
1da177e4 | 1938 | |
88255375 MM |
1939 | /* [unimplemented] */ |
1940 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 1941 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
1942 | break; |
1943 | ||
1944 | case TUNSETPERSIST: | |
54f968d6 JW |
1945 | /* Disable/Enable persist mode. Keep an extra reference to the |
1946 | * module to prevent the module being unprobed. | |
1947 | */ | |
dd38bd85 | 1948 | if (arg && !(tun->flags & TUN_PERSIST)) { |
1da177e4 | 1949 | tun->flags |= TUN_PERSIST; |
54f968d6 | 1950 | __module_get(THIS_MODULE); |
dd38bd85 JW |
1951 | } |
1952 | if (!arg && (tun->flags & TUN_PERSIST)) { | |
1da177e4 | 1953 | tun->flags &= ~TUN_PERSIST; |
54f968d6 JW |
1954 | module_put(THIS_MODULE); |
1955 | } | |
1da177e4 | 1956 | |
6b8a66ee JP |
1957 | tun_debug(KERN_INFO, tun, "persist %s\n", |
1958 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
1959 | break; |
1960 | ||
1961 | case TUNSETOWNER: | |
1962 | /* Set owner of the device */ | |
0625c883 EB |
1963 | owner = make_kuid(current_user_ns(), arg); |
1964 | if (!uid_valid(owner)) { | |
1965 | ret = -EINVAL; | |
1966 | break; | |
1967 | } | |
1968 | tun->owner = owner; | |
1e588338 | 1969 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 1970 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
1971 | break; |
1972 | ||
8c644623 GG |
1973 | case TUNSETGROUP: |
1974 | /* Set group of the device */ | |
0625c883 EB |
1975 | group = make_kgid(current_user_ns(), arg); |
1976 | if (!gid_valid(group)) { | |
1977 | ret = -EINVAL; | |
1978 | break; | |
1979 | } | |
1980 | tun->group = group; | |
1e588338 | 1981 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 1982 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
1983 | break; |
1984 | ||
ff4cc3ac MK |
1985 | case TUNSETLINK: |
1986 | /* Only allow setting the type when the interface is down */ | |
1987 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
1988 | tun_debug(KERN_INFO, tun, |
1989 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 1990 | ret = -EBUSY; |
ff4cc3ac MK |
1991 | } else { |
1992 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
1993 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
1994 | tun->dev->type); | |
48abfe05 | 1995 | ret = 0; |
ff4cc3ac | 1996 | } |
631ab46b | 1997 | break; |
ff4cc3ac | 1998 | |
1da177e4 LT |
1999 | #ifdef TUN_DEBUG |
2000 | case TUNSETDEBUG: | |
2001 | tun->debug = arg; | |
2002 | break; | |
2003 | #endif | |
5228ddc9 | 2004 | case TUNSETOFFLOAD: |
88255375 | 2005 | ret = set_offload(tun, arg); |
631ab46b | 2006 | break; |
5228ddc9 | 2007 | |
f271b2cc MK |
2008 | case TUNSETTXFILTER: |
2009 | /* Can be set only for TAPs */ | |
631ab46b | 2010 | ret = -EINVAL; |
f271b2cc | 2011 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) |
631ab46b | 2012 | break; |
c0e5a8c2 | 2013 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 2014 | break; |
1da177e4 LT |
2015 | |
2016 | case SIOCGIFHWADDR: | |
b595076a | 2017 | /* Get hw address */ |
f271b2cc MK |
2018 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
2019 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 2020 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
2021 | ret = -EFAULT; |
2022 | break; | |
1da177e4 LT |
2023 | |
2024 | case SIOCSIFHWADDR: | |
f271b2cc | 2025 | /* Set hw address */ |
6b8a66ee JP |
2026 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
2027 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 2028 | |
40102371 | 2029 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 2030 | break; |
33dccbb0 HX |
2031 | |
2032 | case TUNGETSNDBUF: | |
54f968d6 | 2033 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
2034 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
2035 | ret = -EFAULT; | |
2036 | break; | |
2037 | ||
2038 | case TUNSETSNDBUF: | |
2039 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
2040 | ret = -EFAULT; | |
2041 | break; | |
2042 | } | |
2043 | ||
c8d68e6b JW |
2044 | tun->sndbuf = sndbuf; |
2045 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
2046 | break; |
2047 | ||
d9d52b51 MT |
2048 | case TUNGETVNETHDRSZ: |
2049 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
2050 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
2051 | ret = -EFAULT; | |
2052 | break; | |
2053 | ||
2054 | case TUNSETVNETHDRSZ: | |
2055 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
2056 | ret = -EFAULT; | |
2057 | break; | |
2058 | } | |
2059 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
2060 | ret = -EINVAL; | |
2061 | break; | |
2062 | } | |
2063 | ||
2064 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
2065 | break; | |
2066 | ||
99405162 MT |
2067 | case TUNATTACHFILTER: |
2068 | /* Can be set only for TAPs */ | |
2069 | ret = -EINVAL; | |
2070 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2071 | break; | |
2072 | ret = -EFAULT; | |
54f968d6 | 2073 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
2074 | break; |
2075 | ||
c8d68e6b | 2076 | ret = tun_attach_filter(tun); |
99405162 MT |
2077 | break; |
2078 | ||
2079 | case TUNDETACHFILTER: | |
2080 | /* Can be set only for TAPs */ | |
2081 | ret = -EINVAL; | |
2082 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2083 | break; | |
c8d68e6b JW |
2084 | ret = 0; |
2085 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
2086 | break; |
2087 | ||
76975e9c PE |
2088 | case TUNGETFILTER: |
2089 | ret = -EINVAL; | |
2090 | if ((tun->flags & TUN_TYPE_MASK) != TUN_TAP_DEV) | |
2091 | break; | |
2092 | ret = -EFAULT; | |
2093 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) | |
2094 | break; | |
2095 | ret = 0; | |
2096 | break; | |
2097 | ||
1da177e4 | 2098 | default: |
631ab46b EB |
2099 | ret = -EINVAL; |
2100 | break; | |
ee289b64 | 2101 | } |
1da177e4 | 2102 | |
876bfd4d HX |
2103 | unlock: |
2104 | rtnl_unlock(); | |
2105 | if (tun) | |
2106 | tun_put(tun); | |
631ab46b | 2107 | return ret; |
1da177e4 LT |
2108 | } |
2109 | ||
50857e2a AB |
2110 | static long tun_chr_ioctl(struct file *file, |
2111 | unsigned int cmd, unsigned long arg) | |
2112 | { | |
2113 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
2114 | } | |
2115 | ||
2116 | #ifdef CONFIG_COMPAT | |
2117 | static long tun_chr_compat_ioctl(struct file *file, | |
2118 | unsigned int cmd, unsigned long arg) | |
2119 | { | |
2120 | switch (cmd) { | |
2121 | case TUNSETIFF: | |
2122 | case TUNGETIFF: | |
2123 | case TUNSETTXFILTER: | |
2124 | case TUNGETSNDBUF: | |
2125 | case TUNSETSNDBUF: | |
2126 | case SIOCGIFHWADDR: | |
2127 | case SIOCSIFHWADDR: | |
2128 | arg = (unsigned long)compat_ptr(arg); | |
2129 | break; | |
2130 | default: | |
2131 | arg = (compat_ulong_t)arg; | |
2132 | break; | |
2133 | } | |
2134 | ||
2135 | /* | |
2136 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
2137 | * the end of that structure. All fields that are used in this | |
2138 | * driver are compatible though, we don't need to convert the | |
2139 | * contents. | |
2140 | */ | |
2141 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
2142 | } | |
2143 | #endif /* CONFIG_COMPAT */ | |
2144 | ||
1da177e4 LT |
2145 | static int tun_chr_fasync(int fd, struct file *file, int on) |
2146 | { | |
54f968d6 | 2147 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2148 | int ret; |
2149 | ||
54f968d6 | 2150 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 2151 | goto out; |
6aa20a22 | 2152 | |
1da177e4 | 2153 | if (on) { |
609d7fa9 | 2154 | ret = __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
1da177e4 | 2155 | if (ret) |
9d319522 | 2156 | goto out; |
54f968d6 | 2157 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 2158 | } else |
54f968d6 | 2159 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
2160 | ret = 0; |
2161 | out: | |
9d319522 | 2162 | return ret; |
1da177e4 LT |
2163 | } |
2164 | ||
2165 | static int tun_chr_open(struct inode *inode, struct file * file) | |
2166 | { | |
631ab46b | 2167 | struct tun_file *tfile; |
deed49fb | 2168 | |
6b8a66ee | 2169 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 2170 | |
54f968d6 JW |
2171 | tfile = (struct tun_file *)sk_alloc(&init_net, AF_UNSPEC, GFP_KERNEL, |
2172 | &tun_proto); | |
631ab46b EB |
2173 | if (!tfile) |
2174 | return -ENOMEM; | |
c956674b | 2175 | RCU_INIT_POINTER(tfile->tun, NULL); |
36b50bab | 2176 | tfile->net = get_net(current->nsproxy->net_ns); |
54f968d6 | 2177 | tfile->flags = 0; |
fb7589a1 | 2178 | tfile->ifindex = 0; |
54f968d6 | 2179 | |
54f968d6 | 2180 | init_waitqueue_head(&tfile->wq.wait); |
9e641bdc | 2181 | RCU_INIT_POINTER(tfile->socket.wq, &tfile->wq); |
54f968d6 JW |
2182 | |
2183 | tfile->socket.file = file; | |
2184 | tfile->socket.ops = &tun_socket_ops; | |
2185 | ||
2186 | sock_init_data(&tfile->socket, &tfile->sk); | |
2187 | sk_change_net(&tfile->sk, tfile->net); | |
2188 | ||
2189 | tfile->sk.sk_write_space = tun_sock_write_space; | |
2190 | tfile->sk.sk_sndbuf = INT_MAX; | |
2191 | ||
631ab46b | 2192 | file->private_data = tfile; |
54f968d6 | 2193 | set_bit(SOCK_EXTERNALLY_ALLOCATED, &tfile->socket.flags); |
4008e97f | 2194 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 2195 | |
19a6afb2 JW |
2196 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
2197 | ||
1da177e4 LT |
2198 | return 0; |
2199 | } | |
2200 | ||
2201 | static int tun_chr_close(struct inode *inode, struct file *file) | |
2202 | { | |
631ab46b | 2203 | struct tun_file *tfile = file->private_data; |
54f968d6 | 2204 | struct net *net = tfile->net; |
1da177e4 | 2205 | |
c8d68e6b | 2206 | tun_detach(tfile, true); |
54f968d6 | 2207 | put_net(net); |
1da177e4 LT |
2208 | |
2209 | return 0; | |
2210 | } | |
2211 | ||
93e14b6d MY |
2212 | #ifdef CONFIG_PROC_FS |
2213 | static int tun_chr_show_fdinfo(struct seq_file *m, struct file *f) | |
2214 | { | |
2215 | struct tun_struct *tun; | |
2216 | struct ifreq ifr; | |
2217 | ||
2218 | memset(&ifr, 0, sizeof(ifr)); | |
2219 | ||
2220 | rtnl_lock(); | |
2221 | tun = tun_get(f); | |
2222 | if (tun) | |
2223 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); | |
2224 | rtnl_unlock(); | |
2225 | ||
2226 | if (tun) | |
2227 | tun_put(tun); | |
2228 | ||
2229 | return seq_printf(m, "iff:\t%s\n", ifr.ifr_name); | |
2230 | } | |
2231 | #endif | |
2232 | ||
d54b1fdb | 2233 | static const struct file_operations tun_fops = { |
6aa20a22 | 2234 | .owner = THIS_MODULE, |
1da177e4 | 2235 | .llseek = no_llseek, |
ee0b3e67 BP |
2236 | .read = do_sync_read, |
2237 | .aio_read = tun_chr_aio_read, | |
2238 | .write = do_sync_write, | |
2239 | .aio_write = tun_chr_aio_write, | |
1da177e4 | 2240 | .poll = tun_chr_poll, |
50857e2a AB |
2241 | .unlocked_ioctl = tun_chr_ioctl, |
2242 | #ifdef CONFIG_COMPAT | |
2243 | .compat_ioctl = tun_chr_compat_ioctl, | |
2244 | #endif | |
1da177e4 LT |
2245 | .open = tun_chr_open, |
2246 | .release = tun_chr_close, | |
93e14b6d MY |
2247 | .fasync = tun_chr_fasync, |
2248 | #ifdef CONFIG_PROC_FS | |
2249 | .show_fdinfo = tun_chr_show_fdinfo, | |
2250 | #endif | |
1da177e4 LT |
2251 | }; |
2252 | ||
2253 | static struct miscdevice tun_miscdev = { | |
2254 | .minor = TUN_MINOR, | |
2255 | .name = "tun", | |
e454cea2 | 2256 | .nodename = "net/tun", |
1da177e4 | 2257 | .fops = &tun_fops, |
1da177e4 LT |
2258 | }; |
2259 | ||
2260 | /* ethtool interface */ | |
2261 | ||
2262 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
2263 | { | |
2264 | cmd->supported = 0; | |
2265 | cmd->advertising = 0; | |
70739497 | 2266 | ethtool_cmd_speed_set(cmd, SPEED_10); |
1da177e4 LT |
2267 | cmd->duplex = DUPLEX_FULL; |
2268 | cmd->port = PORT_TP; | |
2269 | cmd->phy_address = 0; | |
2270 | cmd->transceiver = XCVR_INTERNAL; | |
2271 | cmd->autoneg = AUTONEG_DISABLE; | |
2272 | cmd->maxtxpkt = 0; | |
2273 | cmd->maxrxpkt = 0; | |
2274 | return 0; | |
2275 | } | |
2276 | ||
2277 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
2278 | { | |
2279 | struct tun_struct *tun = netdev_priv(dev); | |
2280 | ||
33a5ba14 RJ |
2281 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
2282 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
2283 | |
2284 | switch (tun->flags & TUN_TYPE_MASK) { | |
2285 | case TUN_TUN_DEV: | |
33a5ba14 | 2286 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 LT |
2287 | break; |
2288 | case TUN_TAP_DEV: | |
33a5ba14 | 2289 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
2290 | break; |
2291 | } | |
2292 | } | |
2293 | ||
2294 | static u32 tun_get_msglevel(struct net_device *dev) | |
2295 | { | |
2296 | #ifdef TUN_DEBUG | |
2297 | struct tun_struct *tun = netdev_priv(dev); | |
2298 | return tun->debug; | |
2299 | #else | |
2300 | return -EOPNOTSUPP; | |
2301 | #endif | |
2302 | } | |
2303 | ||
2304 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
2305 | { | |
2306 | #ifdef TUN_DEBUG | |
2307 | struct tun_struct *tun = netdev_priv(dev); | |
2308 | tun->debug = value; | |
2309 | #endif | |
2310 | } | |
2311 | ||
7282d491 | 2312 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
2313 | .get_settings = tun_get_settings, |
2314 | .get_drvinfo = tun_get_drvinfo, | |
2315 | .get_msglevel = tun_get_msglevel, | |
2316 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 2317 | .get_link = ethtool_op_get_link, |
eda29772 | 2318 | .get_ts_info = ethtool_op_get_ts_info, |
1da177e4 LT |
2319 | }; |
2320 | ||
79d17604 | 2321 | |
1da177e4 LT |
2322 | static int __init tun_init(void) |
2323 | { | |
2324 | int ret = 0; | |
2325 | ||
6b8a66ee JP |
2326 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
2327 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 2328 | |
f019a7a5 | 2329 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 2330 | if (ret) { |
6b8a66ee | 2331 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 2332 | goto err_linkops; |
79d17604 PE |
2333 | } |
2334 | ||
1da177e4 | 2335 | ret = misc_register(&tun_miscdev); |
79d17604 | 2336 | if (ret) { |
6b8a66ee | 2337 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
2338 | goto err_misc; |
2339 | } | |
f019a7a5 | 2340 | return 0; |
79d17604 | 2341 | err_misc: |
f019a7a5 EB |
2342 | rtnl_link_unregister(&tun_link_ops); |
2343 | err_linkops: | |
1da177e4 LT |
2344 | return ret; |
2345 | } | |
2346 | ||
2347 | static void tun_cleanup(void) | |
2348 | { | |
6aa20a22 | 2349 | misc_deregister(&tun_miscdev); |
f019a7a5 | 2350 | rtnl_link_unregister(&tun_link_ops); |
1da177e4 LT |
2351 | } |
2352 | ||
05c2828c MT |
2353 | /* Get an underlying socket object from tun file. Returns error unless file is |
2354 | * attached to a device. The returned object works like a packet socket, it | |
2355 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
2356 | * holding a reference to the file for as long as the socket is in use. */ | |
2357 | struct socket *tun_get_socket(struct file *file) | |
2358 | { | |
6e914fc7 | 2359 | struct tun_file *tfile; |
05c2828c MT |
2360 | if (file->f_op != &tun_fops) |
2361 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
2362 | tfile = file->private_data; |
2363 | if (!tfile) | |
05c2828c | 2364 | return ERR_PTR(-EBADFD); |
54f968d6 | 2365 | return &tfile->socket; |
05c2828c MT |
2366 | } |
2367 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
2368 | ||
1da177e4 LT |
2369 | module_init(tun_init); |
2370 | module_exit(tun_cleanup); | |
2371 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
2372 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
2373 | MODULE_LICENSE("GPL"); | |
2374 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 2375 | MODULE_ALIAS("devname:net/tun"); |