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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> |
e0b46d0e | 73 | #include <linux/uio.h> |
1576d986 | 74 | #include <linux/skb_array.h> |
1da177e4 | 75 | |
1da177e4 LT |
76 | #include <asm/uaccess.h> |
77 | ||
14daa021 RR |
78 | /* Uncomment to enable debugging */ |
79 | /* #define TUN_DEBUG 1 */ | |
80 | ||
1da177e4 LT |
81 | #ifdef TUN_DEBUG |
82 | static int debug; | |
14daa021 | 83 | |
6b8a66ee JP |
84 | #define tun_debug(level, tun, fmt, args...) \ |
85 | do { \ | |
86 | if (tun->debug) \ | |
87 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
88 | } while (0) | |
89 | #define DBG1(level, fmt, args...) \ | |
90 | do { \ | |
91 | if (debug == 2) \ | |
92 | printk(level fmt, ##args); \ | |
93 | } while (0) | |
14daa021 | 94 | #else |
6b8a66ee JP |
95 | #define tun_debug(level, tun, fmt, args...) \ |
96 | do { \ | |
97 | if (0) \ | |
98 | netdev_printk(level, tun->dev, fmt, ##args); \ | |
99 | } while (0) | |
100 | #define DBG1(level, fmt, args...) \ | |
101 | do { \ | |
102 | if (0) \ | |
103 | printk(level fmt, ##args); \ | |
104 | } while (0) | |
14daa021 RR |
105 | #endif |
106 | ||
031f5e03 MT |
107 | /* TUN device flags */ |
108 | ||
109 | /* IFF_ATTACH_QUEUE is never stored in device flags, | |
110 | * overload it to mean fasync when stored there. | |
111 | */ | |
112 | #define TUN_FASYNC IFF_ATTACH_QUEUE | |
1cf8e410 MT |
113 | /* High bits in flags field are unused. */ |
114 | #define TUN_VNET_LE 0x80000000 | |
8b8e658b | 115 | #define TUN_VNET_BE 0x40000000 |
031f5e03 MT |
116 | |
117 | #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \ | |
1cf8e410 | 118 | IFF_MULTI_QUEUE) |
0690899b MT |
119 | #define GOODCOPY_LEN 128 |
120 | ||
f271b2cc MK |
121 | #define FLT_EXACT_COUNT 8 |
122 | struct tap_filter { | |
123 | unsigned int count; /* Number of addrs. Zero means disabled */ | |
124 | u32 mask[2]; /* Mask of the hashed addrs */ | |
125 | unsigned char addr[FLT_EXACT_COUNT][ETH_ALEN]; | |
126 | }; | |
127 | ||
baf71c5c PG |
128 | /* MAX_TAP_QUEUES 256 is chosen to allow rx/tx queues to be equal |
129 | * to max number of VCPUs in guest. */ | |
130 | #define MAX_TAP_QUEUES 256 | |
b8732fb7 | 131 | #define MAX_TAP_FLOWS 4096 |
c8d68e6b | 132 | |
96442e42 JW |
133 | #define TUN_FLOW_EXPIRE (3 * HZ) |
134 | ||
608b9977 PA |
135 | struct tun_pcpu_stats { |
136 | u64 rx_packets; | |
137 | u64 rx_bytes; | |
138 | u64 tx_packets; | |
139 | u64 tx_bytes; | |
140 | struct u64_stats_sync syncp; | |
141 | u32 rx_dropped; | |
142 | u32 tx_dropped; | |
143 | u32 rx_frame_errors; | |
144 | }; | |
145 | ||
54f968d6 | 146 | /* A tun_file connects an open character device to a tuntap netdevice. It |
92d4ea6e | 147 | * also contains all socket related structures (except sock_fprog and tap_filter) |
54f968d6 JW |
148 | * to serve as one transmit queue for tuntap device. The sock_fprog and |
149 | * tap_filter were kept in tun_struct since they were used for filtering for the | |
36fe8c09 | 150 | * netdevice not for a specific queue (at least I didn't see the requirement for |
54f968d6 | 151 | * this). |
6e914fc7 JW |
152 | * |
153 | * RCU usage: | |
36fe8c09 | 154 | * The tun_file and tun_struct are loosely coupled, the pointer from one to the |
6e914fc7 | 155 | * other can only be read while rcu_read_lock or rtnl_lock is held. |
54f968d6 | 156 | */ |
631ab46b | 157 | struct tun_file { |
54f968d6 JW |
158 | struct sock sk; |
159 | struct socket socket; | |
160 | struct socket_wq wq; | |
6e914fc7 | 161 | struct tun_struct __rcu *tun; |
54f968d6 JW |
162 | struct fasync_struct *fasync; |
163 | /* only used for fasnyc */ | |
164 | unsigned int flags; | |
fb7589a1 PE |
165 | union { |
166 | u16 queue_index; | |
167 | unsigned int ifindex; | |
168 | }; | |
4008e97f JW |
169 | struct list_head next; |
170 | struct tun_struct *detached; | |
1576d986 | 171 | struct skb_array tx_array; |
631ab46b EB |
172 | }; |
173 | ||
96442e42 JW |
174 | struct tun_flow_entry { |
175 | struct hlist_node hash_link; | |
176 | struct rcu_head rcu; | |
177 | struct tun_struct *tun; | |
178 | ||
179 | u32 rxhash; | |
9bc88939 | 180 | u32 rps_rxhash; |
96442e42 JW |
181 | int queue_index; |
182 | unsigned long updated; | |
183 | }; | |
184 | ||
185 | #define TUN_NUM_FLOW_ENTRIES 1024 | |
186 | ||
54f968d6 | 187 | /* Since the socket were moved to tun_file, to preserve the behavior of persist |
36fe8c09 | 188 | * device, socket filter, sndbuf and vnet header size were restore when the |
54f968d6 JW |
189 | * file were attached to a persist device. |
190 | */ | |
14daa021 | 191 | struct tun_struct { |
c8d68e6b JW |
192 | struct tun_file __rcu *tfiles[MAX_TAP_QUEUES]; |
193 | unsigned int numqueues; | |
f271b2cc | 194 | unsigned int flags; |
0625c883 EB |
195 | kuid_t owner; |
196 | kgid_t group; | |
14daa021 | 197 | |
14daa021 | 198 | struct net_device *dev; |
c8f44aff | 199 | netdev_features_t set_features; |
88255375 | 200 | #define TUN_USER_FEATURES (NETIF_F_HW_CSUM|NETIF_F_TSO_ECN|NETIF_F_TSO| \ |
e3e3c423 | 201 | NETIF_F_TSO6|NETIF_F_UFO) |
d9d52b51 | 202 | |
eaea34b2 | 203 | int align; |
d9d52b51 | 204 | int vnet_hdr_sz; |
54f968d6 JW |
205 | int sndbuf; |
206 | struct tap_filter txflt; | |
207 | struct sock_fprog fprog; | |
208 | /* protected by rtnl lock */ | |
209 | bool filter_attached; | |
14daa021 RR |
210 | #ifdef TUN_DEBUG |
211 | int debug; | |
1da177e4 | 212 | #endif |
96442e42 | 213 | spinlock_t lock; |
96442e42 JW |
214 | struct hlist_head flows[TUN_NUM_FLOW_ENTRIES]; |
215 | struct timer_list flow_gc_timer; | |
216 | unsigned long ageing_time; | |
4008e97f JW |
217 | unsigned int numdisabled; |
218 | struct list_head disabled; | |
5dbbaf2d | 219 | void *security; |
b8732fb7 | 220 | u32 flow_count; |
608b9977 | 221 | struct tun_pcpu_stats __percpu *pcpu_stats; |
14daa021 | 222 | }; |
1da177e4 | 223 | |
8b8e658b GK |
224 | #ifdef CONFIG_TUN_VNET_CROSS_LE |
225 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
226 | { | |
227 | return tun->flags & TUN_VNET_BE ? false : | |
228 | virtio_legacy_is_little_endian(); | |
229 | } | |
230 | ||
231 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
232 | { | |
233 | int be = !!(tun->flags & TUN_VNET_BE); | |
234 | ||
235 | if (put_user(be, argp)) | |
236 | return -EFAULT; | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
242 | { | |
243 | int be; | |
244 | ||
245 | if (get_user(be, argp)) | |
246 | return -EFAULT; | |
247 | ||
248 | if (be) | |
249 | tun->flags |= TUN_VNET_BE; | |
250 | else | |
251 | tun->flags &= ~TUN_VNET_BE; | |
252 | ||
253 | return 0; | |
254 | } | |
255 | #else | |
256 | static inline bool tun_legacy_is_little_endian(struct tun_struct *tun) | |
257 | { | |
258 | return virtio_legacy_is_little_endian(); | |
259 | } | |
260 | ||
261 | static long tun_get_vnet_be(struct tun_struct *tun, int __user *argp) | |
262 | { | |
263 | return -EINVAL; | |
264 | } | |
265 | ||
266 | static long tun_set_vnet_be(struct tun_struct *tun, int __user *argp) | |
267 | { | |
268 | return -EINVAL; | |
269 | } | |
270 | #endif /* CONFIG_TUN_VNET_CROSS_LE */ | |
271 | ||
25bd55bb GK |
272 | static inline bool tun_is_little_endian(struct tun_struct *tun) |
273 | { | |
7d824109 | 274 | return tun->flags & TUN_VNET_LE || |
8b8e658b | 275 | tun_legacy_is_little_endian(tun); |
25bd55bb GK |
276 | } |
277 | ||
56f0dcc5 MT |
278 | static inline u16 tun16_to_cpu(struct tun_struct *tun, __virtio16 val) |
279 | { | |
25bd55bb | 280 | return __virtio16_to_cpu(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
281 | } |
282 | ||
283 | static inline __virtio16 cpu_to_tun16(struct tun_struct *tun, u16 val) | |
284 | { | |
25bd55bb | 285 | return __cpu_to_virtio16(tun_is_little_endian(tun), val); |
56f0dcc5 MT |
286 | } |
287 | ||
96442e42 JW |
288 | static inline u32 tun_hashfn(u32 rxhash) |
289 | { | |
290 | return rxhash & 0x3ff; | |
291 | } | |
292 | ||
293 | static struct tun_flow_entry *tun_flow_find(struct hlist_head *head, u32 rxhash) | |
294 | { | |
295 | struct tun_flow_entry *e; | |
96442e42 | 296 | |
b67bfe0d | 297 | hlist_for_each_entry_rcu(e, head, hash_link) { |
96442e42 JW |
298 | if (e->rxhash == rxhash) |
299 | return e; | |
300 | } | |
301 | return NULL; | |
302 | } | |
303 | ||
304 | static struct tun_flow_entry *tun_flow_create(struct tun_struct *tun, | |
305 | struct hlist_head *head, | |
306 | u32 rxhash, u16 queue_index) | |
307 | { | |
9fdc6bef ED |
308 | struct tun_flow_entry *e = kmalloc(sizeof(*e), GFP_ATOMIC); |
309 | ||
96442e42 JW |
310 | if (e) { |
311 | tun_debug(KERN_INFO, tun, "create flow: hash %u index %u\n", | |
312 | rxhash, queue_index); | |
313 | e->updated = jiffies; | |
314 | e->rxhash = rxhash; | |
9bc88939 | 315 | e->rps_rxhash = 0; |
96442e42 JW |
316 | e->queue_index = queue_index; |
317 | e->tun = tun; | |
318 | hlist_add_head_rcu(&e->hash_link, head); | |
b8732fb7 | 319 | ++tun->flow_count; |
96442e42 JW |
320 | } |
321 | return e; | |
322 | } | |
323 | ||
96442e42 JW |
324 | static void tun_flow_delete(struct tun_struct *tun, struct tun_flow_entry *e) |
325 | { | |
326 | tun_debug(KERN_INFO, tun, "delete flow: hash %u index %u\n", | |
327 | e->rxhash, e->queue_index); | |
328 | hlist_del_rcu(&e->hash_link); | |
9fdc6bef | 329 | kfree_rcu(e, rcu); |
b8732fb7 | 330 | --tun->flow_count; |
96442e42 JW |
331 | } |
332 | ||
333 | static void tun_flow_flush(struct tun_struct *tun) | |
334 | { | |
335 | int i; | |
336 | ||
337 | spin_lock_bh(&tun->lock); | |
338 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
339 | struct tun_flow_entry *e; | |
b67bfe0d | 340 | struct hlist_node *n; |
96442e42 | 341 | |
b67bfe0d | 342 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) |
96442e42 JW |
343 | tun_flow_delete(tun, e); |
344 | } | |
345 | spin_unlock_bh(&tun->lock); | |
346 | } | |
347 | ||
348 | static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index) | |
349 | { | |
350 | int i; | |
351 | ||
352 | spin_lock_bh(&tun->lock); | |
353 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
354 | struct tun_flow_entry *e; | |
b67bfe0d | 355 | struct hlist_node *n; |
96442e42 | 356 | |
b67bfe0d | 357 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
358 | if (e->queue_index == queue_index) |
359 | tun_flow_delete(tun, e); | |
360 | } | |
361 | } | |
362 | spin_unlock_bh(&tun->lock); | |
363 | } | |
364 | ||
365 | static void tun_flow_cleanup(unsigned long data) | |
366 | { | |
367 | struct tun_struct *tun = (struct tun_struct *)data; | |
368 | unsigned long delay = tun->ageing_time; | |
369 | unsigned long next_timer = jiffies + delay; | |
370 | unsigned long count = 0; | |
371 | int i; | |
372 | ||
373 | tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n"); | |
374 | ||
375 | spin_lock_bh(&tun->lock); | |
376 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) { | |
377 | struct tun_flow_entry *e; | |
b67bfe0d | 378 | struct hlist_node *n; |
96442e42 | 379 | |
b67bfe0d | 380 | hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) { |
96442e42 JW |
381 | unsigned long this_timer; |
382 | count++; | |
383 | this_timer = e->updated + delay; | |
384 | if (time_before_eq(this_timer, jiffies)) | |
385 | tun_flow_delete(tun, e); | |
386 | else if (time_before(this_timer, next_timer)) | |
387 | next_timer = this_timer; | |
388 | } | |
389 | } | |
390 | ||
391 | if (count) | |
392 | mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer)); | |
393 | spin_unlock_bh(&tun->lock); | |
394 | } | |
395 | ||
49974420 | 396 | static void tun_flow_update(struct tun_struct *tun, u32 rxhash, |
9e85722d | 397 | struct tun_file *tfile) |
96442e42 JW |
398 | { |
399 | struct hlist_head *head; | |
400 | struct tun_flow_entry *e; | |
401 | unsigned long delay = tun->ageing_time; | |
9e85722d | 402 | u16 queue_index = tfile->queue_index; |
96442e42 JW |
403 | |
404 | if (!rxhash) | |
405 | return; | |
406 | else | |
407 | head = &tun->flows[tun_hashfn(rxhash)]; | |
408 | ||
409 | rcu_read_lock(); | |
410 | ||
9e85722d JW |
411 | /* We may get a very small possibility of OOO during switching, not |
412 | * worth to optimize.*/ | |
413 | if (tun->numqueues == 1 || tfile->detached) | |
96442e42 JW |
414 | goto unlock; |
415 | ||
416 | e = tun_flow_find(head, rxhash); | |
417 | if (likely(e)) { | |
418 | /* TODO: keep queueing to old queue until it's empty? */ | |
419 | e->queue_index = queue_index; | |
420 | e->updated = jiffies; | |
9bc88939 | 421 | sock_rps_record_flow_hash(e->rps_rxhash); |
96442e42 JW |
422 | } else { |
423 | spin_lock_bh(&tun->lock); | |
b8732fb7 JW |
424 | if (!tun_flow_find(head, rxhash) && |
425 | tun->flow_count < MAX_TAP_FLOWS) | |
96442e42 JW |
426 | tun_flow_create(tun, head, rxhash, queue_index); |
427 | ||
428 | if (!timer_pending(&tun->flow_gc_timer)) | |
429 | mod_timer(&tun->flow_gc_timer, | |
430 | round_jiffies_up(jiffies + delay)); | |
431 | spin_unlock_bh(&tun->lock); | |
432 | } | |
433 | ||
434 | unlock: | |
435 | rcu_read_unlock(); | |
436 | } | |
437 | ||
9bc88939 TH |
438 | /** |
439 | * Save the hash received in the stack receive path and update the | |
440 | * flow_hash table accordingly. | |
441 | */ | |
442 | static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash) | |
443 | { | |
567e4b79 | 444 | if (unlikely(e->rps_rxhash != hash)) |
9bc88939 | 445 | e->rps_rxhash = hash; |
9bc88939 TH |
446 | } |
447 | ||
c8d68e6b | 448 | /* We try to identify a flow through its rxhash first. The reason that |
92d4ea6e | 449 | * we do not check rxq no. is because some cards(e.g 82599), chooses |
c8d68e6b JW |
450 | * the rxq based on the txq where the last packet of the flow comes. As |
451 | * the userspace application move between processors, we may get a | |
452 | * different rxq no. here. If we could not get rxhash, then we would | |
453 | * hope the rxq no. may help here. | |
454 | */ | |
f663dd9a | 455 | static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb, |
99932d4f | 456 | void *accel_priv, select_queue_fallback_t fallback) |
c8d68e6b JW |
457 | { |
458 | struct tun_struct *tun = netdev_priv(dev); | |
96442e42 | 459 | struct tun_flow_entry *e; |
c8d68e6b JW |
460 | u32 txq = 0; |
461 | u32 numqueues = 0; | |
462 | ||
463 | rcu_read_lock(); | |
92bb73ea | 464 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 465 | |
3958afa1 | 466 | txq = skb_get_hash(skb); |
c8d68e6b | 467 | if (txq) { |
96442e42 | 468 | e = tun_flow_find(&tun->flows[tun_hashfn(txq)], txq); |
9bc88939 | 469 | if (e) { |
9bc88939 | 470 | tun_flow_save_rps_rxhash(e, txq); |
fbe4d456 | 471 | txq = e->queue_index; |
9bc88939 | 472 | } else |
96442e42 JW |
473 | /* use multiply and shift instead of expensive divide */ |
474 | txq = ((u64)txq * numqueues) >> 32; | |
c8d68e6b JW |
475 | } else if (likely(skb_rx_queue_recorded(skb))) { |
476 | txq = skb_get_rx_queue(skb); | |
477 | while (unlikely(txq >= numqueues)) | |
478 | txq -= numqueues; | |
479 | } | |
480 | ||
481 | rcu_read_unlock(); | |
482 | return txq; | |
483 | } | |
484 | ||
cde8b15f JW |
485 | static inline bool tun_not_capable(struct tun_struct *tun) |
486 | { | |
487 | const struct cred *cred = current_cred(); | |
c260b772 | 488 | struct net *net = dev_net(tun->dev); |
cde8b15f JW |
489 | |
490 | return ((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) || | |
491 | (gid_valid(tun->group) && !in_egroup_p(tun->group))) && | |
c260b772 | 492 | !ns_capable(net->user_ns, CAP_NET_ADMIN); |
cde8b15f JW |
493 | } |
494 | ||
c8d68e6b JW |
495 | static void tun_set_real_num_queues(struct tun_struct *tun) |
496 | { | |
497 | netif_set_real_num_tx_queues(tun->dev, tun->numqueues); | |
498 | netif_set_real_num_rx_queues(tun->dev, tun->numqueues); | |
499 | } | |
500 | ||
4008e97f JW |
501 | static void tun_disable_queue(struct tun_struct *tun, struct tun_file *tfile) |
502 | { | |
503 | tfile->detached = tun; | |
504 | list_add_tail(&tfile->next, &tun->disabled); | |
505 | ++tun->numdisabled; | |
506 | } | |
507 | ||
d32649d1 | 508 | static struct tun_struct *tun_enable_queue(struct tun_file *tfile) |
4008e97f JW |
509 | { |
510 | struct tun_struct *tun = tfile->detached; | |
511 | ||
512 | tfile->detached = NULL; | |
513 | list_del_init(&tfile->next); | |
514 | --tun->numdisabled; | |
515 | return tun; | |
516 | } | |
517 | ||
4bfb0513 JW |
518 | static void tun_queue_purge(struct tun_file *tfile) |
519 | { | |
1576d986 JW |
520 | struct sk_buff *skb; |
521 | ||
522 | while ((skb = skb_array_consume(&tfile->tx_array)) != NULL) | |
523 | kfree_skb(skb); | |
524 | ||
4bfb0513 JW |
525 | skb_queue_purge(&tfile->sk.sk_error_queue); |
526 | } | |
527 | ||
c8d68e6b JW |
528 | static void __tun_detach(struct tun_file *tfile, bool clean) |
529 | { | |
530 | struct tun_file *ntfile; | |
531 | struct tun_struct *tun; | |
c8d68e6b | 532 | |
b8deabd3 JW |
533 | tun = rtnl_dereference(tfile->tun); |
534 | ||
9e85722d | 535 | if (tun && !tfile->detached) { |
c8d68e6b JW |
536 | u16 index = tfile->queue_index; |
537 | BUG_ON(index >= tun->numqueues); | |
c8d68e6b JW |
538 | |
539 | rcu_assign_pointer(tun->tfiles[index], | |
540 | tun->tfiles[tun->numqueues - 1]); | |
b8deabd3 | 541 | ntfile = rtnl_dereference(tun->tfiles[index]); |
c8d68e6b JW |
542 | ntfile->queue_index = index; |
543 | ||
544 | --tun->numqueues; | |
9e85722d | 545 | if (clean) { |
c956674b | 546 | RCU_INIT_POINTER(tfile->tun, NULL); |
4008e97f | 547 | sock_put(&tfile->sk); |
9e85722d | 548 | } else |
4008e97f | 549 | tun_disable_queue(tun, tfile); |
c8d68e6b JW |
550 | |
551 | synchronize_net(); | |
96442e42 | 552 | tun_flow_delete_by_queue(tun, tun->numqueues + 1); |
c8d68e6b | 553 | /* Drop read queue */ |
4bfb0513 | 554 | tun_queue_purge(tfile); |
c8d68e6b | 555 | tun_set_real_num_queues(tun); |
dd38bd85 | 556 | } else if (tfile->detached && clean) { |
4008e97f | 557 | tun = tun_enable_queue(tfile); |
dd38bd85 JW |
558 | sock_put(&tfile->sk); |
559 | } | |
c8d68e6b JW |
560 | |
561 | if (clean) { | |
af668b3c MT |
562 | if (tun && tun->numqueues == 0 && tun->numdisabled == 0) { |
563 | netif_carrier_off(tun->dev); | |
564 | ||
40630b82 | 565 | if (!(tun->flags & IFF_PERSIST) && |
af668b3c | 566 | tun->dev->reg_state == NETREG_REGISTERED) |
4008e97f | 567 | unregister_netdevice(tun->dev); |
af668b3c | 568 | } |
1576d986 JW |
569 | if (tun) |
570 | skb_array_cleanup(&tfile->tx_array); | |
140e807d | 571 | sock_put(&tfile->sk); |
c8d68e6b JW |
572 | } |
573 | } | |
574 | ||
575 | static void tun_detach(struct tun_file *tfile, bool clean) | |
576 | { | |
577 | rtnl_lock(); | |
578 | __tun_detach(tfile, clean); | |
579 | rtnl_unlock(); | |
580 | } | |
581 | ||
582 | static void tun_detach_all(struct net_device *dev) | |
583 | { | |
584 | struct tun_struct *tun = netdev_priv(dev); | |
4008e97f | 585 | struct tun_file *tfile, *tmp; |
c8d68e6b JW |
586 | int i, n = tun->numqueues; |
587 | ||
588 | for (i = 0; i < n; i++) { | |
b8deabd3 | 589 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 590 | BUG_ON(!tfile); |
addf8fc4 | 591 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
9e641bdc | 592 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 593 | RCU_INIT_POINTER(tfile->tun, NULL); |
c8d68e6b JW |
594 | --tun->numqueues; |
595 | } | |
9e85722d | 596 | list_for_each_entry(tfile, &tun->disabled, next) { |
addf8fc4 | 597 | tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN; |
9e641bdc | 598 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
c956674b | 599 | RCU_INIT_POINTER(tfile->tun, NULL); |
9e85722d | 600 | } |
c8d68e6b JW |
601 | BUG_ON(tun->numqueues != 0); |
602 | ||
603 | synchronize_net(); | |
604 | for (i = 0; i < n; i++) { | |
b8deabd3 | 605 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b | 606 | /* Drop read queue */ |
4bfb0513 | 607 | tun_queue_purge(tfile); |
c8d68e6b JW |
608 | sock_put(&tfile->sk); |
609 | } | |
4008e97f JW |
610 | list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) { |
611 | tun_enable_queue(tfile); | |
4bfb0513 | 612 | tun_queue_purge(tfile); |
4008e97f JW |
613 | sock_put(&tfile->sk); |
614 | } | |
615 | BUG_ON(tun->numdisabled != 0); | |
dd38bd85 | 616 | |
40630b82 | 617 | if (tun->flags & IFF_PERSIST) |
dd38bd85 | 618 | module_put(THIS_MODULE); |
c8d68e6b JW |
619 | } |
620 | ||
849c9b6f | 621 | static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filter) |
a7385ba2 | 622 | { |
631ab46b | 623 | struct tun_file *tfile = file->private_data; |
1576d986 | 624 | struct net_device *dev = tun->dev; |
38231b7a | 625 | int err; |
a7385ba2 | 626 | |
5dbbaf2d PM |
627 | err = security_tun_dev_attach(tfile->socket.sk, tun->security); |
628 | if (err < 0) | |
629 | goto out; | |
630 | ||
38231b7a | 631 | err = -EINVAL; |
9e85722d | 632 | if (rtnl_dereference(tfile->tun) && !tfile->detached) |
38231b7a EB |
633 | goto out; |
634 | ||
635 | err = -EBUSY; | |
40630b82 | 636 | if (!(tun->flags & IFF_MULTI_QUEUE) && tun->numqueues == 1) |
c8d68e6b JW |
637 | goto out; |
638 | ||
639 | err = -E2BIG; | |
4008e97f JW |
640 | if (!tfile->detached && |
641 | tun->numqueues + tun->numdisabled == MAX_TAP_QUEUES) | |
38231b7a EB |
642 | goto out; |
643 | ||
644 | err = 0; | |
54f968d6 | 645 | |
92d4ea6e | 646 | /* Re-attach the filter to persist device */ |
849c9b6f | 647 | if (!skip_filter && (tun->filter_attached == true)) { |
8ced425e HFS |
648 | lock_sock(tfile->socket.sk); |
649 | err = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
650 | release_sock(tfile->socket.sk); | |
54f968d6 JW |
651 | if (!err) |
652 | goto out; | |
653 | } | |
1576d986 JW |
654 | |
655 | if (!tfile->detached && | |
656 | skb_array_init(&tfile->tx_array, dev->tx_queue_len, GFP_KERNEL)) { | |
657 | err = -ENOMEM; | |
658 | goto out; | |
659 | } | |
660 | ||
c8d68e6b | 661 | tfile->queue_index = tun->numqueues; |
addf8fc4 | 662 | tfile->socket.sk->sk_shutdown &= ~RCV_SHUTDOWN; |
6e914fc7 | 663 | rcu_assign_pointer(tfile->tun, tun); |
c8d68e6b | 664 | rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile); |
c8d68e6b | 665 | tun->numqueues++; |
a7385ba2 | 666 | |
4008e97f JW |
667 | if (tfile->detached) |
668 | tun_enable_queue(tfile); | |
669 | else | |
670 | sock_hold(&tfile->sk); | |
671 | ||
c8d68e6b | 672 | tun_set_real_num_queues(tun); |
a7385ba2 | 673 | |
c8d68e6b JW |
674 | /* device is allowed to go away first, so no need to hold extra |
675 | * refcnt. | |
676 | */ | |
677 | ||
678 | out: | |
679 | return err; | |
631ab46b EB |
680 | } |
681 | ||
682 | static struct tun_struct *__tun_get(struct tun_file *tfile) | |
683 | { | |
6e914fc7 | 684 | struct tun_struct *tun; |
c70f1829 | 685 | |
6e914fc7 JW |
686 | rcu_read_lock(); |
687 | tun = rcu_dereference(tfile->tun); | |
688 | if (tun) | |
689 | dev_hold(tun->dev); | |
690 | rcu_read_unlock(); | |
c70f1829 EB |
691 | |
692 | return tun; | |
631ab46b EB |
693 | } |
694 | ||
695 | static struct tun_struct *tun_get(struct file *file) | |
696 | { | |
697 | return __tun_get(file->private_data); | |
698 | } | |
699 | ||
700 | static void tun_put(struct tun_struct *tun) | |
701 | { | |
6e914fc7 | 702 | dev_put(tun->dev); |
631ab46b EB |
703 | } |
704 | ||
6b8a66ee | 705 | /* TAP filtering */ |
f271b2cc MK |
706 | static void addr_hash_set(u32 *mask, const u8 *addr) |
707 | { | |
708 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
709 | mask[n >> 5] |= (1 << (n & 31)); | |
710 | } | |
711 | ||
712 | static unsigned int addr_hash_test(const u32 *mask, const u8 *addr) | |
713 | { | |
714 | int n = ether_crc(ETH_ALEN, addr) >> 26; | |
715 | return mask[n >> 5] & (1 << (n & 31)); | |
716 | } | |
717 | ||
718 | static int update_filter(struct tap_filter *filter, void __user *arg) | |
719 | { | |
720 | struct { u8 u[ETH_ALEN]; } *addr; | |
721 | struct tun_filter uf; | |
722 | int err, alen, n, nexact; | |
723 | ||
724 | if (copy_from_user(&uf, arg, sizeof(uf))) | |
725 | return -EFAULT; | |
726 | ||
727 | if (!uf.count) { | |
728 | /* Disabled */ | |
729 | filter->count = 0; | |
730 | return 0; | |
731 | } | |
732 | ||
733 | alen = ETH_ALEN * uf.count; | |
734 | addr = kmalloc(alen, GFP_KERNEL); | |
735 | if (!addr) | |
736 | return -ENOMEM; | |
737 | ||
738 | if (copy_from_user(addr, arg + sizeof(uf), alen)) { | |
739 | err = -EFAULT; | |
740 | goto done; | |
741 | } | |
742 | ||
743 | /* The filter is updated without holding any locks. Which is | |
744 | * perfectly safe. We disable it first and in the worst | |
745 | * case we'll accept a few undesired packets. */ | |
746 | filter->count = 0; | |
747 | wmb(); | |
748 | ||
749 | /* Use first set of addresses as an exact filter */ | |
750 | for (n = 0; n < uf.count && n < FLT_EXACT_COUNT; n++) | |
751 | memcpy(filter->addr[n], addr[n].u, ETH_ALEN); | |
752 | ||
753 | nexact = n; | |
754 | ||
cfbf84fc AW |
755 | /* Remaining multicast addresses are hashed, |
756 | * unicast will leave the filter disabled. */ | |
f271b2cc | 757 | memset(filter->mask, 0, sizeof(filter->mask)); |
cfbf84fc AW |
758 | for (; n < uf.count; n++) { |
759 | if (!is_multicast_ether_addr(addr[n].u)) { | |
760 | err = 0; /* no filter */ | |
761 | goto done; | |
762 | } | |
f271b2cc | 763 | addr_hash_set(filter->mask, addr[n].u); |
cfbf84fc | 764 | } |
f271b2cc MK |
765 | |
766 | /* For ALLMULTI just set the mask to all ones. | |
767 | * This overrides the mask populated above. */ | |
768 | if ((uf.flags & TUN_FLT_ALLMULTI)) | |
769 | memset(filter->mask, ~0, sizeof(filter->mask)); | |
770 | ||
771 | /* Now enable the filter */ | |
772 | wmb(); | |
773 | filter->count = nexact; | |
774 | ||
775 | /* Return the number of exact filters */ | |
776 | err = nexact; | |
777 | ||
778 | done: | |
779 | kfree(addr); | |
780 | return err; | |
781 | } | |
782 | ||
783 | /* Returns: 0 - drop, !=0 - accept */ | |
784 | static int run_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
785 | { | |
786 | /* Cannot use eth_hdr(skb) here because skb_mac_hdr() is incorrect | |
787 | * at this point. */ | |
788 | struct ethhdr *eh = (struct ethhdr *) skb->data; | |
789 | int i; | |
790 | ||
791 | /* Exact match */ | |
792 | for (i = 0; i < filter->count; i++) | |
2e42e474 | 793 | if (ether_addr_equal(eh->h_dest, filter->addr[i])) |
f271b2cc MK |
794 | return 1; |
795 | ||
796 | /* Inexact match (multicast only) */ | |
797 | if (is_multicast_ether_addr(eh->h_dest)) | |
798 | return addr_hash_test(filter->mask, eh->h_dest); | |
799 | ||
800 | return 0; | |
801 | } | |
802 | ||
803 | /* | |
804 | * Checks whether the packet is accepted or not. | |
805 | * Returns: 0 - drop, !=0 - accept | |
806 | */ | |
807 | static int check_filter(struct tap_filter *filter, const struct sk_buff *skb) | |
808 | { | |
809 | if (!filter->count) | |
810 | return 1; | |
811 | ||
812 | return run_filter(filter, skb); | |
813 | } | |
814 | ||
1da177e4 LT |
815 | /* Network device part of the driver */ |
816 | ||
7282d491 | 817 | static const struct ethtool_ops tun_ethtool_ops; |
1da177e4 | 818 | |
c70f1829 EB |
819 | /* Net device detach from fd. */ |
820 | static void tun_net_uninit(struct net_device *dev) | |
821 | { | |
c8d68e6b | 822 | tun_detach_all(dev); |
c70f1829 EB |
823 | } |
824 | ||
1da177e4 LT |
825 | /* Net device open. */ |
826 | static int tun_net_open(struct net_device *dev) | |
827 | { | |
c8d68e6b | 828 | netif_tx_start_all_queues(dev); |
1da177e4 LT |
829 | return 0; |
830 | } | |
831 | ||
832 | /* Net device close. */ | |
833 | static int tun_net_close(struct net_device *dev) | |
834 | { | |
c8d68e6b | 835 | netif_tx_stop_all_queues(dev); |
1da177e4 LT |
836 | return 0; |
837 | } | |
838 | ||
839 | /* Net device start xmit */ | |
424efe9c | 840 | static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev) |
1da177e4 LT |
841 | { |
842 | struct tun_struct *tun = netdev_priv(dev); | |
c8d68e6b | 843 | int txq = skb->queue_mapping; |
6e914fc7 | 844 | struct tun_file *tfile; |
fa35864e | 845 | u32 numqueues = 0; |
1da177e4 | 846 | |
6e914fc7 | 847 | rcu_read_lock(); |
c8d68e6b | 848 | tfile = rcu_dereference(tun->tfiles[txq]); |
fa35864e | 849 | numqueues = ACCESS_ONCE(tun->numqueues); |
c8d68e6b | 850 | |
1da177e4 | 851 | /* Drop packet if interface is not attached */ |
fa35864e | 852 | if (txq >= numqueues) |
1da177e4 LT |
853 | goto drop; |
854 | ||
3df97ba8 JW |
855 | #ifdef CONFIG_RPS |
856 | if (numqueues == 1 && static_key_false(&rps_needed)) { | |
9bc88939 TH |
857 | /* Select queue was not called for the skbuff, so we extract the |
858 | * RPS hash and save it into the flow_table here. | |
859 | */ | |
860 | __u32 rxhash; | |
861 | ||
862 | rxhash = skb_get_hash(skb); | |
863 | if (rxhash) { | |
864 | struct tun_flow_entry *e; | |
865 | e = tun_flow_find(&tun->flows[tun_hashfn(rxhash)], | |
866 | rxhash); | |
867 | if (e) | |
868 | tun_flow_save_rps_rxhash(e, rxhash); | |
869 | } | |
870 | } | |
3df97ba8 | 871 | #endif |
9bc88939 | 872 | |
6e914fc7 JW |
873 | tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len); |
874 | ||
c8d68e6b JW |
875 | BUG_ON(!tfile); |
876 | ||
f271b2cc MK |
877 | /* Drop if the filter does not like it. |
878 | * This is a noop if the filter is disabled. | |
879 | * Filter can be enabled only for the TAP devices. */ | |
880 | if (!check_filter(&tun->txflt, skb)) | |
881 | goto drop; | |
882 | ||
54f968d6 JW |
883 | if (tfile->socket.sk->sk_filter && |
884 | sk_filter(tfile->socket.sk, skb)) | |
99405162 MT |
885 | goto drop; |
886 | ||
36fe8c09 | 887 | /* Limit the number of packets queued by dividing txq length with the |
c8d68e6b JW |
888 | * number of queues. |
889 | */ | |
fa35864e DC |
890 | if (skb_queue_len(&tfile->socket.sk->sk_receive_queue) * numqueues |
891 | >= dev->tx_queue_len) | |
5d097109 | 892 | goto drop; |
1da177e4 | 893 | |
7bf66305 JW |
894 | if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC))) |
895 | goto drop; | |
896 | ||
5fcd2d8b | 897 | if (skb->sk && sk_fullsock(skb->sk)) { |
c14ac945 SHY |
898 | sock_tx_timestamp(skb->sk, skb->sk->sk_tsflags, |
899 | &skb_shinfo(skb)->tx_flags); | |
eda29772 RC |
900 | sw_tx_timestamp(skb); |
901 | } | |
902 | ||
0110d6f2 | 903 | /* Orphan the skb - required as we might hang on to it |
7bf66305 JW |
904 | * for indefinite time. |
905 | */ | |
0110d6f2 MT |
906 | skb_orphan(skb); |
907 | ||
f8af75f3 ED |
908 | nf_reset(skb); |
909 | ||
1576d986 JW |
910 | if (skb_array_produce(&tfile->tx_array, skb)) |
911 | goto drop; | |
1da177e4 LT |
912 | |
913 | /* Notify and wake up reader process */ | |
54f968d6 JW |
914 | if (tfile->flags & TUN_FASYNC) |
915 | kill_fasync(&tfile->fasync, SIGIO, POLL_IN); | |
9e641bdc | 916 | tfile->socket.sk->sk_data_ready(tfile->socket.sk); |
6e914fc7 JW |
917 | |
918 | rcu_read_unlock(); | |
6ed10654 | 919 | return NETDEV_TX_OK; |
1da177e4 LT |
920 | |
921 | drop: | |
608b9977 | 922 | this_cpu_inc(tun->pcpu_stats->tx_dropped); |
149d36f7 | 923 | skb_tx_error(skb); |
1da177e4 | 924 | kfree_skb(skb); |
6e914fc7 | 925 | rcu_read_unlock(); |
baeababb | 926 | return NET_XMIT_DROP; |
1da177e4 LT |
927 | } |
928 | ||
f271b2cc | 929 | static void tun_net_mclist(struct net_device *dev) |
1da177e4 | 930 | { |
f271b2cc MK |
931 | /* |
932 | * This callback is supposed to deal with mc filter in | |
933 | * _rx_ path and has nothing to do with the _tx_ path. | |
934 | * In rx path we always accept everything userspace gives us. | |
935 | */ | |
1da177e4 LT |
936 | } |
937 | ||
4885a504 ES |
938 | #define MIN_MTU 68 |
939 | #define MAX_MTU 65535 | |
940 | ||
941 | static int | |
942 | tun_net_change_mtu(struct net_device *dev, int new_mtu) | |
943 | { | |
944 | if (new_mtu < MIN_MTU || new_mtu + dev->hard_header_len > MAX_MTU) | |
945 | return -EINVAL; | |
946 | dev->mtu = new_mtu; | |
947 | return 0; | |
948 | } | |
949 | ||
c8f44aff MM |
950 | static netdev_features_t tun_net_fix_features(struct net_device *dev, |
951 | netdev_features_t features) | |
88255375 MM |
952 | { |
953 | struct tun_struct *tun = netdev_priv(dev); | |
954 | ||
955 | return (features & tun->set_features) | (features & ~TUN_USER_FEATURES); | |
956 | } | |
bebd097a NH |
957 | #ifdef CONFIG_NET_POLL_CONTROLLER |
958 | static void tun_poll_controller(struct net_device *dev) | |
959 | { | |
960 | /* | |
961 | * Tun only receives frames when: | |
962 | * 1) the char device endpoint gets data from user space | |
963 | * 2) the tun socket gets a sendmsg call from user space | |
92d4ea6e | 964 | * Since both of those are synchronous operations, we are guaranteed |
bebd097a | 965 | * never to have pending data when we poll for it |
92d4ea6e | 966 | * so there is nothing to do here but return. |
bebd097a NH |
967 | * We need this though so netpoll recognizes us as an interface that |
968 | * supports polling, which enables bridge devices in virt setups to | |
969 | * still use netconsole | |
970 | */ | |
971 | return; | |
972 | } | |
973 | #endif | |
eaea34b2 PA |
974 | |
975 | static void tun_set_headroom(struct net_device *dev, int new_hr) | |
976 | { | |
977 | struct tun_struct *tun = netdev_priv(dev); | |
978 | ||
979 | if (new_hr < NET_SKB_PAD) | |
980 | new_hr = NET_SKB_PAD; | |
981 | ||
982 | tun->align = new_hr; | |
983 | } | |
984 | ||
608b9977 PA |
985 | static struct rtnl_link_stats64 * |
986 | tun_net_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) | |
987 | { | |
988 | u32 rx_dropped = 0, tx_dropped = 0, rx_frame_errors = 0; | |
989 | struct tun_struct *tun = netdev_priv(dev); | |
990 | struct tun_pcpu_stats *p; | |
991 | int i; | |
992 | ||
993 | for_each_possible_cpu(i) { | |
994 | u64 rxpackets, rxbytes, txpackets, txbytes; | |
995 | unsigned int start; | |
996 | ||
997 | p = per_cpu_ptr(tun->pcpu_stats, i); | |
998 | do { | |
999 | start = u64_stats_fetch_begin(&p->syncp); | |
1000 | rxpackets = p->rx_packets; | |
1001 | rxbytes = p->rx_bytes; | |
1002 | txpackets = p->tx_packets; | |
1003 | txbytes = p->tx_bytes; | |
1004 | } while (u64_stats_fetch_retry(&p->syncp, start)); | |
1005 | ||
1006 | stats->rx_packets += rxpackets; | |
1007 | stats->rx_bytes += rxbytes; | |
1008 | stats->tx_packets += txpackets; | |
1009 | stats->tx_bytes += txbytes; | |
1010 | ||
1011 | /* u32 counters */ | |
1012 | rx_dropped += p->rx_dropped; | |
1013 | rx_frame_errors += p->rx_frame_errors; | |
1014 | tx_dropped += p->tx_dropped; | |
1015 | } | |
1016 | stats->rx_dropped = rx_dropped; | |
1017 | stats->rx_frame_errors = rx_frame_errors; | |
1018 | stats->tx_dropped = tx_dropped; | |
1019 | return stats; | |
1020 | } | |
1021 | ||
758e43b7 | 1022 | static const struct net_device_ops tun_netdev_ops = { |
c70f1829 | 1023 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1024 | .ndo_open = tun_net_open, |
1025 | .ndo_stop = tun_net_close, | |
00829823 | 1026 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 1027 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 1028 | .ndo_fix_features = tun_net_fix_features, |
c8d68e6b | 1029 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
1030 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1031 | .ndo_poll_controller = tun_poll_controller, | |
1032 | #endif | |
eaea34b2 | 1033 | .ndo_set_rx_headroom = tun_set_headroom, |
608b9977 | 1034 | .ndo_get_stats64 = tun_net_get_stats64, |
758e43b7 SH |
1035 | }; |
1036 | ||
1037 | static const struct net_device_ops tap_netdev_ops = { | |
c70f1829 | 1038 | .ndo_uninit = tun_net_uninit, |
758e43b7 SH |
1039 | .ndo_open = tun_net_open, |
1040 | .ndo_stop = tun_net_close, | |
00829823 | 1041 | .ndo_start_xmit = tun_net_xmit, |
758e43b7 | 1042 | .ndo_change_mtu = tun_net_change_mtu, |
88255375 | 1043 | .ndo_fix_features = tun_net_fix_features, |
afc4b13d | 1044 | .ndo_set_rx_mode = tun_net_mclist, |
758e43b7 SH |
1045 | .ndo_set_mac_address = eth_mac_addr, |
1046 | .ndo_validate_addr = eth_validate_addr, | |
c8d68e6b | 1047 | .ndo_select_queue = tun_select_queue, |
bebd097a NH |
1048 | #ifdef CONFIG_NET_POLL_CONTROLLER |
1049 | .ndo_poll_controller = tun_poll_controller, | |
1050 | #endif | |
5e52796a | 1051 | .ndo_features_check = passthru_features_check, |
eaea34b2 | 1052 | .ndo_set_rx_headroom = tun_set_headroom, |
608b9977 | 1053 | .ndo_get_stats64 = tun_net_get_stats64, |
758e43b7 SH |
1054 | }; |
1055 | ||
944a1376 | 1056 | static void tun_flow_init(struct tun_struct *tun) |
96442e42 JW |
1057 | { |
1058 | int i; | |
1059 | ||
96442e42 JW |
1060 | for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) |
1061 | INIT_HLIST_HEAD(&tun->flows[i]); | |
1062 | ||
1063 | tun->ageing_time = TUN_FLOW_EXPIRE; | |
1064 | setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun); | |
1065 | mod_timer(&tun->flow_gc_timer, | |
1066 | round_jiffies_up(jiffies + tun->ageing_time)); | |
96442e42 JW |
1067 | } |
1068 | ||
1069 | static void tun_flow_uninit(struct tun_struct *tun) | |
1070 | { | |
1071 | del_timer_sync(&tun->flow_gc_timer); | |
1072 | tun_flow_flush(tun); | |
96442e42 JW |
1073 | } |
1074 | ||
1da177e4 LT |
1075 | /* Initialize net device. */ |
1076 | static void tun_net_init(struct net_device *dev) | |
1077 | { | |
1078 | struct tun_struct *tun = netdev_priv(dev); | |
6aa20a22 | 1079 | |
1da177e4 | 1080 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 | 1081 | case IFF_TUN: |
758e43b7 SH |
1082 | dev->netdev_ops = &tun_netdev_ops; |
1083 | ||
1da177e4 LT |
1084 | /* Point-to-Point TUN Device */ |
1085 | dev->hard_header_len = 0; | |
1086 | dev->addr_len = 0; | |
1087 | dev->mtu = 1500; | |
1088 | ||
1089 | /* Zero header length */ | |
6aa20a22 | 1090 | dev->type = ARPHRD_NONE; |
1da177e4 | 1091 | dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
1da177e4 LT |
1092 | break; |
1093 | ||
40630b82 | 1094 | case IFF_TAP: |
7a0a9608 | 1095 | dev->netdev_ops = &tap_netdev_ops; |
1da177e4 | 1096 | /* Ethernet TAP Device */ |
1da177e4 | 1097 | ether_setup(dev); |
550fd08c | 1098 | dev->priv_flags &= ~IFF_TX_SKB_SHARING; |
a676847b | 1099 | dev->priv_flags |= IFF_LIVE_ADDR_CHANGE; |
36226a8d | 1100 | |
f2cedb63 | 1101 | eth_hw_addr_random(dev); |
36226a8d | 1102 | |
1da177e4 LT |
1103 | break; |
1104 | } | |
1105 | } | |
1106 | ||
1107 | /* Character device part */ | |
1108 | ||
1109 | /* Poll */ | |
c8d68e6b | 1110 | static unsigned int tun_chr_poll(struct file *file, poll_table *wait) |
6aa20a22 | 1111 | { |
b2430de3 EB |
1112 | struct tun_file *tfile = file->private_data; |
1113 | struct tun_struct *tun = __tun_get(tfile); | |
3c8a9c63 | 1114 | struct sock *sk; |
33dccbb0 | 1115 | unsigned int mask = 0; |
1da177e4 LT |
1116 | |
1117 | if (!tun) | |
eac9e902 | 1118 | return POLLERR; |
1da177e4 | 1119 | |
54f968d6 | 1120 | sk = tfile->socket.sk; |
3c8a9c63 | 1121 | |
6b8a66ee | 1122 | tun_debug(KERN_INFO, tun, "tun_chr_poll\n"); |
1da177e4 | 1123 | |
9e641bdc | 1124 | poll_wait(file, sk_sleep(sk), wait); |
6aa20a22 | 1125 | |
1576d986 | 1126 | if (!skb_array_empty(&tfile->tx_array)) |
1da177e4 LT |
1127 | mask |= POLLIN | POLLRDNORM; |
1128 | ||
33dccbb0 | 1129 | if (sock_writeable(sk) || |
9cd3e072 | 1130 | (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags) && |
33dccbb0 HX |
1131 | sock_writeable(sk))) |
1132 | mask |= POLLOUT | POLLWRNORM; | |
1133 | ||
c70f1829 EB |
1134 | if (tun->dev->reg_state != NETREG_REGISTERED) |
1135 | mask = POLLERR; | |
1136 | ||
631ab46b | 1137 | tun_put(tun); |
1da177e4 LT |
1138 | return mask; |
1139 | } | |
1140 | ||
f42157cb RR |
1141 | /* prepad is the amount to reserve at front. len is length after that. |
1142 | * linear is a hint as to how much to copy (usually headers). */ | |
54f968d6 | 1143 | static struct sk_buff *tun_alloc_skb(struct tun_file *tfile, |
6f7c156c | 1144 | size_t prepad, size_t len, |
1145 | size_t linear, int noblock) | |
f42157cb | 1146 | { |
54f968d6 | 1147 | struct sock *sk = tfile->socket.sk; |
f42157cb | 1148 | struct sk_buff *skb; |
33dccbb0 | 1149 | int err; |
f42157cb RR |
1150 | |
1151 | /* Under a page? Don't bother with paged skb. */ | |
0eca93bc | 1152 | if (prepad + len < PAGE_SIZE || !linear) |
33dccbb0 | 1153 | linear = len; |
f42157cb | 1154 | |
33dccbb0 | 1155 | skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock, |
28d64271 | 1156 | &err, 0); |
f42157cb | 1157 | if (!skb) |
33dccbb0 | 1158 | return ERR_PTR(err); |
f42157cb RR |
1159 | |
1160 | skb_reserve(skb, prepad); | |
1161 | skb_put(skb, linear); | |
33dccbb0 HX |
1162 | skb->data_len = len - linear; |
1163 | skb->len += len - linear; | |
f42157cb RR |
1164 | |
1165 | return skb; | |
1166 | } | |
1167 | ||
1da177e4 | 1168 | /* Get packet from user space buffer */ |
54f968d6 | 1169 | static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile, |
f5ff53b4 AV |
1170 | void *msg_control, struct iov_iter *from, |
1171 | int noblock) | |
1da177e4 | 1172 | { |
09640e63 | 1173 | struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) }; |
1da177e4 | 1174 | struct sk_buff *skb; |
f5ff53b4 | 1175 | size_t total_len = iov_iter_count(from); |
eaea34b2 | 1176 | size_t len = total_len, align = tun->align, linear; |
f43798c2 | 1177 | struct virtio_net_hdr gso = { 0 }; |
608b9977 | 1178 | struct tun_pcpu_stats *stats; |
96f8d9ec | 1179 | int good_linear; |
0690899b MT |
1180 | int copylen; |
1181 | bool zerocopy = false; | |
1182 | int err; | |
49974420 | 1183 | u32 rxhash; |
f5ff53b4 | 1184 | ssize_t n; |
1da177e4 | 1185 | |
1bd4978a ED |
1186 | if (!(tun->dev->flags & IFF_UP)) |
1187 | return -EIO; | |
1188 | ||
40630b82 | 1189 | if (!(tun->flags & IFF_NO_PI)) { |
15718ea0 | 1190 | if (len < sizeof(pi)) |
1da177e4 | 1191 | return -EINVAL; |
15718ea0 | 1192 | len -= sizeof(pi); |
1da177e4 | 1193 | |
f5ff53b4 AV |
1194 | n = copy_from_iter(&pi, sizeof(pi), from); |
1195 | if (n != sizeof(pi)) | |
1da177e4 LT |
1196 | return -EFAULT; |
1197 | } | |
1198 | ||
40630b82 | 1199 | if (tun->flags & IFF_VNET_HDR) { |
15718ea0 | 1200 | if (len < tun->vnet_hdr_sz) |
f43798c2 | 1201 | return -EINVAL; |
15718ea0 | 1202 | len -= tun->vnet_hdr_sz; |
f43798c2 | 1203 | |
f5ff53b4 AV |
1204 | n = copy_from_iter(&gso, sizeof(gso), from); |
1205 | if (n != sizeof(gso)) | |
f43798c2 RR |
1206 | return -EFAULT; |
1207 | ||
4909122f | 1208 | if ((gso.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) && |
56f0dcc5 MT |
1209 | tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2 > tun16_to_cpu(tun, gso.hdr_len)) |
1210 | gso.hdr_len = cpu_to_tun16(tun, tun16_to_cpu(tun, gso.csum_start) + tun16_to_cpu(tun, gso.csum_offset) + 2); | |
4909122f | 1211 | |
56f0dcc5 | 1212 | if (tun16_to_cpu(tun, gso.hdr_len) > len) |
f43798c2 | 1213 | return -EINVAL; |
d8febb77 | 1214 | iov_iter_advance(from, tun->vnet_hdr_sz - sizeof(gso)); |
f43798c2 RR |
1215 | } |
1216 | ||
40630b82 | 1217 | if ((tun->flags & TUN_TYPE_MASK) == IFF_TAP) { |
a504b86e | 1218 | align += NET_IP_ALIGN; |
0eca93bc | 1219 | if (unlikely(len < ETH_HLEN || |
56f0dcc5 | 1220 | (gso.hdr_len && tun16_to_cpu(tun, gso.hdr_len) < ETH_HLEN))) |
e01bf1c8 RR |
1221 | return -EINVAL; |
1222 | } | |
6aa20a22 | 1223 | |
96f8d9ec JW |
1224 | good_linear = SKB_MAX_HEAD(align); |
1225 | ||
88529176 | 1226 | if (msg_control) { |
f5ff53b4 AV |
1227 | struct iov_iter i = *from; |
1228 | ||
88529176 JW |
1229 | /* There are 256 bytes to be copied in skb, so there is |
1230 | * enough room for skb expand head in case it is used. | |
0690899b MT |
1231 | * The rest of the buffer is mapped from userspace. |
1232 | */ | |
56f0dcc5 | 1233 | copylen = gso.hdr_len ? tun16_to_cpu(tun, gso.hdr_len) : GOODCOPY_LEN; |
96f8d9ec JW |
1234 | if (copylen > good_linear) |
1235 | copylen = good_linear; | |
3dd5c330 | 1236 | linear = copylen; |
f5ff53b4 AV |
1237 | iov_iter_advance(&i, copylen); |
1238 | if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS) | |
88529176 JW |
1239 | zerocopy = true; |
1240 | } | |
1241 | ||
1242 | if (!zerocopy) { | |
0690899b | 1243 | copylen = len; |
56f0dcc5 | 1244 | if (tun16_to_cpu(tun, gso.hdr_len) > good_linear) |
96f8d9ec JW |
1245 | linear = good_linear; |
1246 | else | |
56f0dcc5 | 1247 | linear = tun16_to_cpu(tun, gso.hdr_len); |
3dd5c330 | 1248 | } |
0690899b | 1249 | |
3dd5c330 | 1250 | skb = tun_alloc_skb(tfile, align, copylen, linear, noblock); |
33dccbb0 HX |
1251 | if (IS_ERR(skb)) { |
1252 | if (PTR_ERR(skb) != -EAGAIN) | |
608b9977 | 1253 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
33dccbb0 | 1254 | return PTR_ERR(skb); |
1da177e4 LT |
1255 | } |
1256 | ||
0690899b | 1257 | if (zerocopy) |
f5ff53b4 | 1258 | err = zerocopy_sg_from_iter(skb, from); |
88529176 | 1259 | else { |
f5ff53b4 | 1260 | err = skb_copy_datagram_from_iter(skb, 0, from, len); |
88529176 JW |
1261 | if (!err && msg_control) { |
1262 | struct ubuf_info *uarg = msg_control; | |
1263 | uarg->callback(uarg, false); | |
1264 | } | |
1265 | } | |
0690899b MT |
1266 | |
1267 | if (err) { | |
608b9977 | 1268 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
8f22757e | 1269 | kfree_skb(skb); |
1da177e4 | 1270 | return -EFAULT; |
8f22757e | 1271 | } |
1da177e4 | 1272 | |
df10db98 PA |
1273 | err = virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun)); |
1274 | if (err) { | |
1275 | this_cpu_inc(tun->pcpu_stats->rx_frame_errors); | |
1276 | kfree_skb(skb); | |
1277 | return -EINVAL; | |
1278 | } | |
1279 | ||
1da177e4 | 1280 | switch (tun->flags & TUN_TYPE_MASK) { |
40630b82 MT |
1281 | case IFF_TUN: |
1282 | if (tun->flags & IFF_NO_PI) { | |
f09f7ee2 AWC |
1283 | switch (skb->data[0] & 0xf0) { |
1284 | case 0x40: | |
1285 | pi.proto = htons(ETH_P_IP); | |
1286 | break; | |
1287 | case 0x60: | |
1288 | pi.proto = htons(ETH_P_IPV6); | |
1289 | break; | |
1290 | default: | |
608b9977 | 1291 | this_cpu_inc(tun->pcpu_stats->rx_dropped); |
f09f7ee2 AWC |
1292 | kfree_skb(skb); |
1293 | return -EINVAL; | |
1294 | } | |
1295 | } | |
1296 | ||
459a98ed | 1297 | skb_reset_mac_header(skb); |
1da177e4 | 1298 | skb->protocol = pi.proto; |
4c13eb66 | 1299 | skb->dev = tun->dev; |
1da177e4 | 1300 | break; |
40630b82 | 1301 | case IFF_TAP: |
1da177e4 LT |
1302 | skb->protocol = eth_type_trans(skb, tun->dev); |
1303 | break; | |
6403eab1 | 1304 | } |
1da177e4 | 1305 | |
0690899b MT |
1306 | /* copy skb_ubuf_info for callback when skb has no error */ |
1307 | if (zerocopy) { | |
1308 | skb_shinfo(skb)->destructor_arg = msg_control; | |
1309 | skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; | |
c9af6db4 | 1310 | skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG; |
0690899b MT |
1311 | } |
1312 | ||
72f65107 | 1313 | skb_reset_network_header(skb); |
40893fd0 | 1314 | skb_probe_transport_header(skb, 0); |
38502af7 | 1315 | |
3958afa1 | 1316 | rxhash = skb_get_hash(skb); |
1da177e4 | 1317 | netif_rx_ni(skb); |
6aa20a22 | 1318 | |
608b9977 PA |
1319 | stats = get_cpu_ptr(tun->pcpu_stats); |
1320 | u64_stats_update_begin(&stats->syncp); | |
1321 | stats->rx_packets++; | |
1322 | stats->rx_bytes += len; | |
1323 | u64_stats_update_end(&stats->syncp); | |
1324 | put_cpu_ptr(stats); | |
1da177e4 | 1325 | |
9e85722d | 1326 | tun_flow_update(tun, rxhash, tfile); |
0690899b | 1327 | return total_len; |
6aa20a22 | 1328 | } |
1da177e4 | 1329 | |
f5ff53b4 | 1330 | static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from) |
1da177e4 | 1331 | { |
33dccbb0 | 1332 | struct file *file = iocb->ki_filp; |
ab46d779 | 1333 | struct tun_struct *tun = tun_get(file); |
54f968d6 | 1334 | struct tun_file *tfile = file->private_data; |
631ab46b | 1335 | ssize_t result; |
1da177e4 LT |
1336 | |
1337 | if (!tun) | |
1338 | return -EBADFD; | |
1339 | ||
f5ff53b4 | 1340 | result = tun_get_user(tun, tfile, NULL, from, file->f_flags & O_NONBLOCK); |
631ab46b EB |
1341 | |
1342 | tun_put(tun); | |
1343 | return result; | |
1da177e4 LT |
1344 | } |
1345 | ||
1da177e4 | 1346 | /* Put packet to the user space buffer */ |
6f7c156c | 1347 | static ssize_t tun_put_user(struct tun_struct *tun, |
54f968d6 | 1348 | struct tun_file *tfile, |
6f7c156c | 1349 | struct sk_buff *skb, |
e0b46d0e | 1350 | struct iov_iter *iter) |
1da177e4 LT |
1351 | { |
1352 | struct tun_pi pi = { 0, skb->protocol }; | |
608b9977 | 1353 | struct tun_pcpu_stats *stats; |
e0b46d0e | 1354 | ssize_t total; |
8c847d25 | 1355 | int vlan_offset = 0; |
a8f9bfdf | 1356 | int vlan_hlen = 0; |
2eb783c4 | 1357 | int vnet_hdr_sz = 0; |
a8f9bfdf | 1358 | |
df8a39de | 1359 | if (skb_vlan_tag_present(skb)) |
a8f9bfdf | 1360 | vlan_hlen = VLAN_HLEN; |
1da177e4 | 1361 | |
40630b82 | 1362 | if (tun->flags & IFF_VNET_HDR) |
2eb783c4 | 1363 | vnet_hdr_sz = tun->vnet_hdr_sz; |
1da177e4 | 1364 | |
e0b46d0e HX |
1365 | total = skb->len + vlan_hlen + vnet_hdr_sz; |
1366 | ||
40630b82 | 1367 | if (!(tun->flags & IFF_NO_PI)) { |
e0b46d0e | 1368 | if (iov_iter_count(iter) < sizeof(pi)) |
1da177e4 LT |
1369 | return -EINVAL; |
1370 | ||
e0b46d0e HX |
1371 | total += sizeof(pi); |
1372 | if (iov_iter_count(iter) < total) { | |
1da177e4 LT |
1373 | /* Packet will be striped */ |
1374 | pi.flags |= TUN_PKT_STRIP; | |
1375 | } | |
6aa20a22 | 1376 | |
e0b46d0e | 1377 | if (copy_to_iter(&pi, sizeof(pi), iter) != sizeof(pi)) |
1da177e4 | 1378 | return -EFAULT; |
6aa20a22 | 1379 | } |
1da177e4 | 1380 | |
2eb783c4 | 1381 | if (vnet_hdr_sz) { |
f43798c2 | 1382 | struct virtio_net_hdr gso = { 0 }; /* no info leak */ |
34166093 MR |
1383 | int ret; |
1384 | ||
e0b46d0e | 1385 | if (iov_iter_count(iter) < vnet_hdr_sz) |
f43798c2 RR |
1386 | return -EINVAL; |
1387 | ||
34166093 MR |
1388 | ret = virtio_net_hdr_from_skb(skb, &gso, |
1389 | tun_is_little_endian(tun)); | |
1390 | if (ret) { | |
f43798c2 | 1391 | struct skb_shared_info *sinfo = skb_shinfo(skb); |
34166093 MR |
1392 | pr_err("unexpected GSO type: " |
1393 | "0x%x, gso_size %d, hdr_len %d\n", | |
1394 | sinfo->gso_type, tun16_to_cpu(tun, gso.gso_size), | |
1395 | tun16_to_cpu(tun, gso.hdr_len)); | |
1396 | print_hex_dump(KERN_ERR, "tun: ", | |
1397 | DUMP_PREFIX_NONE, | |
1398 | 16, 1, skb->head, | |
1399 | min((int)tun16_to_cpu(tun, gso.hdr_len), 64), true); | |
1400 | WARN_ON_ONCE(1); | |
1401 | return -EINVAL; | |
1402 | } | |
f43798c2 | 1403 | |
e0b46d0e | 1404 | if (copy_to_iter(&gso, sizeof(gso), iter) != sizeof(gso)) |
f43798c2 | 1405 | return -EFAULT; |
8c847d25 JW |
1406 | |
1407 | iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso)); | |
f43798c2 RR |
1408 | } |
1409 | ||
a8f9bfdf | 1410 | if (vlan_hlen) { |
e0b46d0e | 1411 | int ret; |
6680ec68 JW |
1412 | struct { |
1413 | __be16 h_vlan_proto; | |
1414 | __be16 h_vlan_TCI; | |
1415 | } veth; | |
1416 | ||
1417 | veth.h_vlan_proto = skb->vlan_proto; | |
df8a39de | 1418 | veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb)); |
6680ec68 JW |
1419 | |
1420 | vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto); | |
6680ec68 | 1421 | |
e0b46d0e HX |
1422 | ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset); |
1423 | if (ret || !iov_iter_count(iter)) | |
6680ec68 JW |
1424 | goto done; |
1425 | ||
e0b46d0e HX |
1426 | ret = copy_to_iter(&veth, sizeof(veth), iter); |
1427 | if (ret != sizeof(veth) || !iov_iter_count(iter)) | |
6680ec68 JW |
1428 | goto done; |
1429 | } | |
1da177e4 | 1430 | |
e0b46d0e | 1431 | skb_copy_datagram_iter(skb, vlan_offset, iter, skb->len - vlan_offset); |
1da177e4 | 1432 | |
6680ec68 | 1433 | done: |
608b9977 PA |
1434 | /* caller is in process context, */ |
1435 | stats = get_cpu_ptr(tun->pcpu_stats); | |
1436 | u64_stats_update_begin(&stats->syncp); | |
1437 | stats->tx_packets++; | |
1438 | stats->tx_bytes += skb->len + vlan_hlen; | |
1439 | u64_stats_update_end(&stats->syncp); | |
1440 | put_cpu_ptr(tun->pcpu_stats); | |
1da177e4 LT |
1441 | |
1442 | return total; | |
1443 | } | |
1444 | ||
1576d986 JW |
1445 | static struct sk_buff *tun_ring_recv(struct tun_file *tfile, int noblock, |
1446 | int *err) | |
1447 | { | |
1448 | DECLARE_WAITQUEUE(wait, current); | |
1449 | struct sk_buff *skb = NULL; | |
f48cc6b2 | 1450 | int error = 0; |
1576d986 JW |
1451 | |
1452 | skb = skb_array_consume(&tfile->tx_array); | |
1453 | if (skb) | |
1454 | goto out; | |
1455 | if (noblock) { | |
f48cc6b2 | 1456 | error = -EAGAIN; |
1576d986 JW |
1457 | goto out; |
1458 | } | |
1459 | ||
1460 | add_wait_queue(&tfile->wq.wait, &wait); | |
1461 | current->state = TASK_INTERRUPTIBLE; | |
1462 | ||
1463 | while (1) { | |
1464 | skb = skb_array_consume(&tfile->tx_array); | |
1465 | if (skb) | |
1466 | break; | |
1467 | if (signal_pending(current)) { | |
f48cc6b2 | 1468 | error = -ERESTARTSYS; |
1576d986 JW |
1469 | break; |
1470 | } | |
1471 | if (tfile->socket.sk->sk_shutdown & RCV_SHUTDOWN) { | |
f48cc6b2 | 1472 | error = -EFAULT; |
1576d986 JW |
1473 | break; |
1474 | } | |
1475 | ||
1476 | schedule(); | |
1477 | } | |
1478 | ||
1479 | current->state = TASK_RUNNING; | |
1480 | remove_wait_queue(&tfile->wq.wait, &wait); | |
1481 | ||
1482 | out: | |
f48cc6b2 | 1483 | *err = error; |
1576d986 JW |
1484 | return skb; |
1485 | } | |
1486 | ||
54f968d6 | 1487 | static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile, |
9b067034 AV |
1488 | struct iov_iter *to, |
1489 | int noblock) | |
1da177e4 | 1490 | { |
1da177e4 | 1491 | struct sk_buff *skb; |
9b067034 | 1492 | ssize_t ret; |
1576d986 | 1493 | int err; |
1da177e4 | 1494 | |
3872baf6 | 1495 | tun_debug(KERN_INFO, tun, "tun_do_read\n"); |
1da177e4 | 1496 | |
9b067034 AV |
1497 | if (!iov_iter_count(to)) |
1498 | return 0; | |
1da177e4 | 1499 | |
1576d986 JW |
1500 | /* Read frames from ring */ |
1501 | skb = tun_ring_recv(tfile, noblock, &err); | |
e0b46d0e | 1502 | if (!skb) |
957f094f | 1503 | return err; |
e0b46d0e | 1504 | |
9b067034 | 1505 | ret = tun_put_user(tun, tfile, skb, to); |
f51a5e82 | 1506 | if (unlikely(ret < 0)) |
f271b2cc | 1507 | kfree_skb(skb); |
f51a5e82 JW |
1508 | else |
1509 | consume_skb(skb); | |
1da177e4 | 1510 | |
05c2828c MT |
1511 | return ret; |
1512 | } | |
1513 | ||
9b067034 | 1514 | static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to) |
05c2828c MT |
1515 | { |
1516 | struct file *file = iocb->ki_filp; | |
1517 | struct tun_file *tfile = file->private_data; | |
1518 | struct tun_struct *tun = __tun_get(tfile); | |
9b067034 | 1519 | ssize_t len = iov_iter_count(to), ret; |
05c2828c MT |
1520 | |
1521 | if (!tun) | |
1522 | return -EBADFD; | |
9b067034 | 1523 | ret = tun_do_read(tun, tfile, to, file->f_flags & O_NONBLOCK); |
42404c09 | 1524 | ret = min_t(ssize_t, ret, len); |
d0b7da8a ZYW |
1525 | if (ret > 0) |
1526 | iocb->ki_pos = ret; | |
631ab46b | 1527 | tun_put(tun); |
1da177e4 LT |
1528 | return ret; |
1529 | } | |
1530 | ||
96442e42 JW |
1531 | static void tun_free_netdev(struct net_device *dev) |
1532 | { | |
1533 | struct tun_struct *tun = netdev_priv(dev); | |
1534 | ||
4008e97f | 1535 | BUG_ON(!(list_empty(&tun->disabled))); |
608b9977 | 1536 | free_percpu(tun->pcpu_stats); |
96442e42 | 1537 | tun_flow_uninit(tun); |
5dbbaf2d | 1538 | security_tun_dev_free_security(tun->security); |
96442e42 JW |
1539 | free_netdev(dev); |
1540 | } | |
1541 | ||
1da177e4 LT |
1542 | static void tun_setup(struct net_device *dev) |
1543 | { | |
1544 | struct tun_struct *tun = netdev_priv(dev); | |
1545 | ||
0625c883 EB |
1546 | tun->owner = INVALID_UID; |
1547 | tun->group = INVALID_GID; | |
1da177e4 | 1548 | |
1da177e4 | 1549 | dev->ethtool_ops = &tun_ethtool_ops; |
96442e42 | 1550 | dev->destructor = tun_free_netdev; |
016adb72 JW |
1551 | /* We prefer our own queue length */ |
1552 | dev->tx_queue_len = TUN_READQ_SIZE; | |
1da177e4 LT |
1553 | } |
1554 | ||
f019a7a5 EB |
1555 | /* Trivial set of netlink ops to allow deleting tun or tap |
1556 | * device with netlink. | |
1557 | */ | |
1558 | static int tun_validate(struct nlattr *tb[], struct nlattr *data[]) | |
1559 | { | |
1560 | return -EINVAL; | |
1561 | } | |
1562 | ||
1563 | static struct rtnl_link_ops tun_link_ops __read_mostly = { | |
1564 | .kind = DRV_NAME, | |
1565 | .priv_size = sizeof(struct tun_struct), | |
1566 | .setup = tun_setup, | |
1567 | .validate = tun_validate, | |
1568 | }; | |
1569 | ||
33dccbb0 HX |
1570 | static void tun_sock_write_space(struct sock *sk) |
1571 | { | |
54f968d6 | 1572 | struct tun_file *tfile; |
43815482 | 1573 | wait_queue_head_t *wqueue; |
33dccbb0 HX |
1574 | |
1575 | if (!sock_writeable(sk)) | |
1576 | return; | |
1577 | ||
9cd3e072 | 1578 | if (!test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags)) |
33dccbb0 HX |
1579 | return; |
1580 | ||
43815482 ED |
1581 | wqueue = sk_sleep(sk); |
1582 | if (wqueue && waitqueue_active(wqueue)) | |
1583 | wake_up_interruptible_sync_poll(wqueue, POLLOUT | | |
05c2828c | 1584 | POLLWRNORM | POLLWRBAND); |
c722c625 | 1585 | |
54f968d6 JW |
1586 | tfile = container_of(sk, struct tun_file, sk); |
1587 | kill_fasync(&tfile->fasync, SIGIO, POLL_OUT); | |
33dccbb0 HX |
1588 | } |
1589 | ||
1b784140 | 1590 | static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len) |
05c2828c | 1591 | { |
54f968d6 JW |
1592 | int ret; |
1593 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1594 | struct tun_struct *tun = __tun_get(tfile); | |
1595 | ||
1596 | if (!tun) | |
1597 | return -EBADFD; | |
f5ff53b4 | 1598 | |
c0371da6 | 1599 | ret = tun_get_user(tun, tfile, m->msg_control, &m->msg_iter, |
f5ff53b4 | 1600 | m->msg_flags & MSG_DONTWAIT); |
54f968d6 JW |
1601 | tun_put(tun); |
1602 | return ret; | |
05c2828c MT |
1603 | } |
1604 | ||
1b784140 | 1605 | static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len, |
05c2828c MT |
1606 | int flags) |
1607 | { | |
54f968d6 JW |
1608 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); |
1609 | struct tun_struct *tun = __tun_get(tfile); | |
05c2828c | 1610 | int ret; |
54f968d6 JW |
1611 | |
1612 | if (!tun) | |
1613 | return -EBADFD; | |
1614 | ||
eda29772 | 1615 | if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) { |
3811ae76 G |
1616 | ret = -EINVAL; |
1617 | goto out; | |
1618 | } | |
eda29772 RC |
1619 | if (flags & MSG_ERRQUEUE) { |
1620 | ret = sock_recv_errqueue(sock->sk, m, total_len, | |
1621 | SOL_PACKET, TUN_TX_TIMESTAMP); | |
1622 | goto out; | |
1623 | } | |
c0371da6 | 1624 | ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT); |
87897931 | 1625 | if (ret > (ssize_t)total_len) { |
42404c09 DM |
1626 | m->msg_flags |= MSG_TRUNC; |
1627 | ret = flags & MSG_TRUNC ? ret : total_len; | |
1628 | } | |
3811ae76 | 1629 | out: |
54f968d6 | 1630 | tun_put(tun); |
05c2828c MT |
1631 | return ret; |
1632 | } | |
1633 | ||
1576d986 JW |
1634 | static int tun_peek_len(struct socket *sock) |
1635 | { | |
1636 | struct tun_file *tfile = container_of(sock, struct tun_file, socket); | |
1637 | struct tun_struct *tun; | |
1638 | int ret = 0; | |
1639 | ||
1640 | tun = __tun_get(tfile); | |
1641 | if (!tun) | |
1642 | return 0; | |
1643 | ||
1644 | ret = skb_array_peek_len(&tfile->tx_array); | |
1645 | tun_put(tun); | |
1646 | ||
1647 | return ret; | |
1648 | } | |
1649 | ||
05c2828c MT |
1650 | /* Ops structure to mimic raw sockets with tun */ |
1651 | static const struct proto_ops tun_socket_ops = { | |
1576d986 | 1652 | .peek_len = tun_peek_len, |
05c2828c MT |
1653 | .sendmsg = tun_sendmsg, |
1654 | .recvmsg = tun_recvmsg, | |
1655 | }; | |
1656 | ||
33dccbb0 HX |
1657 | static struct proto tun_proto = { |
1658 | .name = "tun", | |
1659 | .owner = THIS_MODULE, | |
54f968d6 | 1660 | .obj_size = sizeof(struct tun_file), |
33dccbb0 | 1661 | }; |
f019a7a5 | 1662 | |
980c9e8c DW |
1663 | static int tun_flags(struct tun_struct *tun) |
1664 | { | |
031f5e03 | 1665 | return tun->flags & (TUN_FEATURES | IFF_PERSIST | IFF_TUN | IFF_TAP); |
980c9e8c DW |
1666 | } |
1667 | ||
1668 | static ssize_t tun_show_flags(struct device *dev, struct device_attribute *attr, | |
1669 | char *buf) | |
1670 | { | |
1671 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
1672 | return sprintf(buf, "0x%x\n", tun_flags(tun)); | |
1673 | } | |
1674 | ||
1675 | static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr, | |
1676 | char *buf) | |
1677 | { | |
1678 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1679 | return uid_valid(tun->owner)? |
1680 | sprintf(buf, "%u\n", | |
1681 | from_kuid_munged(current_user_ns(), tun->owner)): | |
1682 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1683 | } |
1684 | ||
1685 | static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr, | |
1686 | char *buf) | |
1687 | { | |
1688 | struct tun_struct *tun = netdev_priv(to_net_dev(dev)); | |
0625c883 EB |
1689 | return gid_valid(tun->group) ? |
1690 | sprintf(buf, "%u\n", | |
1691 | from_kgid_munged(current_user_ns(), tun->group)): | |
1692 | sprintf(buf, "-1\n"); | |
980c9e8c DW |
1693 | } |
1694 | ||
1695 | static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL); | |
1696 | static DEVICE_ATTR(owner, 0444, tun_show_owner, NULL); | |
1697 | static DEVICE_ATTR(group, 0444, tun_show_group, NULL); | |
1698 | ||
c4d33e24 TI |
1699 | static struct attribute *tun_dev_attrs[] = { |
1700 | &dev_attr_tun_flags.attr, | |
1701 | &dev_attr_owner.attr, | |
1702 | &dev_attr_group.attr, | |
1703 | NULL | |
1704 | }; | |
1705 | ||
1706 | static const struct attribute_group tun_attr_group = { | |
1707 | .attrs = tun_dev_attrs | |
1708 | }; | |
1709 | ||
d647a591 | 1710 | static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) |
1da177e4 LT |
1711 | { |
1712 | struct tun_struct *tun; | |
54f968d6 | 1713 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
1714 | struct net_device *dev; |
1715 | int err; | |
1716 | ||
7c0c3b1a JW |
1717 | if (tfile->detached) |
1718 | return -EINVAL; | |
1719 | ||
74a3e5a7 EB |
1720 | dev = __dev_get_by_name(net, ifr->ifr_name); |
1721 | if (dev) { | |
f85ba780 DW |
1722 | if (ifr->ifr_flags & IFF_TUN_EXCL) |
1723 | return -EBUSY; | |
74a3e5a7 EB |
1724 | if ((ifr->ifr_flags & IFF_TUN) && dev->netdev_ops == &tun_netdev_ops) |
1725 | tun = netdev_priv(dev); | |
1726 | else if ((ifr->ifr_flags & IFF_TAP) && dev->netdev_ops == &tap_netdev_ops) | |
1727 | tun = netdev_priv(dev); | |
1728 | else | |
1729 | return -EINVAL; | |
1730 | ||
8e6d91ae | 1731 | if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) != |
40630b82 | 1732 | !!(tun->flags & IFF_MULTI_QUEUE)) |
8e6d91ae JW |
1733 | return -EINVAL; |
1734 | ||
cde8b15f | 1735 | if (tun_not_capable(tun)) |
2b980dbd | 1736 | return -EPERM; |
5dbbaf2d | 1737 | err = security_tun_dev_open(tun->security); |
2b980dbd PM |
1738 | if (err < 0) |
1739 | return err; | |
1740 | ||
849c9b6f | 1741 | err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER); |
a7385ba2 EB |
1742 | if (err < 0) |
1743 | return err; | |
4008e97f | 1744 | |
40630b82 | 1745 | if (tun->flags & IFF_MULTI_QUEUE && |
e8dbad66 JW |
1746 | (tun->numqueues + tun->numdisabled > 1)) { |
1747 | /* One or more queue has already been attached, no need | |
1748 | * to initialize the device again. | |
1749 | */ | |
1750 | return 0; | |
1751 | } | |
6aa20a22 | 1752 | } |
1da177e4 LT |
1753 | else { |
1754 | char *name; | |
1755 | unsigned long flags = 0; | |
edfb6a14 JW |
1756 | int queues = ifr->ifr_flags & IFF_MULTI_QUEUE ? |
1757 | MAX_TAP_QUEUES : 1; | |
1da177e4 | 1758 | |
c260b772 | 1759 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
ca6bb5d7 | 1760 | return -EPERM; |
2b980dbd PM |
1761 | err = security_tun_dev_create(); |
1762 | if (err < 0) | |
1763 | return err; | |
ca6bb5d7 | 1764 | |
1da177e4 LT |
1765 | /* Set dev type */ |
1766 | if (ifr->ifr_flags & IFF_TUN) { | |
1767 | /* TUN device */ | |
40630b82 | 1768 | flags |= IFF_TUN; |
1da177e4 LT |
1769 | name = "tun%d"; |
1770 | } else if (ifr->ifr_flags & IFF_TAP) { | |
1771 | /* TAP device */ | |
40630b82 | 1772 | flags |= IFF_TAP; |
1da177e4 | 1773 | name = "tap%d"; |
6aa20a22 | 1774 | } else |
36989b90 | 1775 | return -EINVAL; |
6aa20a22 | 1776 | |
1da177e4 LT |
1777 | if (*ifr->ifr_name) |
1778 | name = ifr->ifr_name; | |
1779 | ||
c8d68e6b | 1780 | dev = alloc_netdev_mqs(sizeof(struct tun_struct), name, |
c835a677 TG |
1781 | NET_NAME_UNKNOWN, tun_setup, queues, |
1782 | queues); | |
edfb6a14 | 1783 | |
1da177e4 LT |
1784 | if (!dev) |
1785 | return -ENOMEM; | |
1786 | ||
fc54c658 | 1787 | dev_net_set(dev, net); |
f019a7a5 | 1788 | dev->rtnl_link_ops = &tun_link_ops; |
fb7589a1 | 1789 | dev->ifindex = tfile->ifindex; |
c4d33e24 | 1790 | dev->sysfs_groups[0] = &tun_attr_group; |
758e43b7 | 1791 | |
1da177e4 LT |
1792 | tun = netdev_priv(dev); |
1793 | tun->dev = dev; | |
1794 | tun->flags = flags; | |
f271b2cc | 1795 | tun->txflt.count = 0; |
d9d52b51 | 1796 | tun->vnet_hdr_sz = sizeof(struct virtio_net_hdr); |
33dccbb0 | 1797 | |
eaea34b2 | 1798 | tun->align = NET_SKB_PAD; |
54f968d6 JW |
1799 | tun->filter_attached = false; |
1800 | tun->sndbuf = tfile->socket.sk->sk_sndbuf; | |
33dccbb0 | 1801 | |
608b9977 PA |
1802 | tun->pcpu_stats = netdev_alloc_pcpu_stats(struct tun_pcpu_stats); |
1803 | if (!tun->pcpu_stats) { | |
1804 | err = -ENOMEM; | |
1805 | goto err_free_dev; | |
1806 | } | |
1807 | ||
96442e42 JW |
1808 | spin_lock_init(&tun->lock); |
1809 | ||
5dbbaf2d PM |
1810 | err = security_tun_dev_alloc_security(&tun->security); |
1811 | if (err < 0) | |
608b9977 | 1812 | goto err_free_stat; |
2b980dbd | 1813 | |
1da177e4 | 1814 | tun_net_init(dev); |
944a1376 | 1815 | tun_flow_init(tun); |
96442e42 | 1816 | |
88255375 | 1817 | dev->hw_features = NETIF_F_SG | NETIF_F_FRAGLIST | |
6680ec68 JW |
1818 | TUN_USER_FEATURES | NETIF_F_HW_VLAN_CTAG_TX | |
1819 | NETIF_F_HW_VLAN_STAG_TX; | |
2a2bbf17 | 1820 | dev->features = dev->hw_features | NETIF_F_LLTX; |
6671b224 FLVC |
1821 | dev->vlan_features = dev->features & |
1822 | ~(NETIF_F_HW_VLAN_CTAG_TX | | |
1823 | NETIF_F_HW_VLAN_STAG_TX); | |
88255375 | 1824 | |
4008e97f | 1825 | INIT_LIST_HEAD(&tun->disabled); |
849c9b6f | 1826 | err = tun_attach(tun, file, false); |
eb0fb363 | 1827 | if (err < 0) |
662ca437 | 1828 | goto err_free_flow; |
eb0fb363 | 1829 | |
1da177e4 LT |
1830 | err = register_netdevice(tun->dev); |
1831 | if (err < 0) | |
662ca437 | 1832 | goto err_detach; |
1da177e4 LT |
1833 | } |
1834 | ||
af668b3c MT |
1835 | netif_carrier_on(tun->dev); |
1836 | ||
6b8a66ee | 1837 | tun_debug(KERN_INFO, tun, "tun_set_iff\n"); |
1da177e4 | 1838 | |
031f5e03 MT |
1839 | tun->flags = (tun->flags & ~TUN_FEATURES) | |
1840 | (ifr->ifr_flags & TUN_FEATURES); | |
c8d68e6b | 1841 | |
e35259a9 MK |
1842 | /* Make sure persistent devices do not get stuck in |
1843 | * xoff state. | |
1844 | */ | |
1845 | if (netif_running(tun->dev)) | |
c8d68e6b | 1846 | netif_tx_wake_all_queues(tun->dev); |
e35259a9 | 1847 | |
1da177e4 LT |
1848 | strcpy(ifr->ifr_name, tun->dev->name); |
1849 | return 0; | |
1850 | ||
662ca437 JW |
1851 | err_detach: |
1852 | tun_detach_all(dev); | |
1853 | err_free_flow: | |
1854 | tun_flow_uninit(tun); | |
1855 | security_tun_dev_free_security(tun->security); | |
608b9977 PA |
1856 | err_free_stat: |
1857 | free_percpu(tun->pcpu_stats); | |
662ca437 | 1858 | err_free_dev: |
1da177e4 | 1859 | free_netdev(dev); |
1da177e4 LT |
1860 | return err; |
1861 | } | |
1862 | ||
9ce99cf6 | 1863 | static void tun_get_iff(struct net *net, struct tun_struct *tun, |
876bfd4d | 1864 | struct ifreq *ifr) |
e3b99556 | 1865 | { |
6b8a66ee | 1866 | tun_debug(KERN_INFO, tun, "tun_get_iff\n"); |
e3b99556 MM |
1867 | |
1868 | strcpy(ifr->ifr_name, tun->dev->name); | |
1869 | ||
980c9e8c | 1870 | ifr->ifr_flags = tun_flags(tun); |
e3b99556 | 1871 | |
e3b99556 MM |
1872 | } |
1873 | ||
5228ddc9 RR |
1874 | /* This is like a cut-down ethtool ops, except done via tun fd so no |
1875 | * privs required. */ | |
88255375 | 1876 | static int set_offload(struct tun_struct *tun, unsigned long arg) |
5228ddc9 | 1877 | { |
c8f44aff | 1878 | netdev_features_t features = 0; |
5228ddc9 RR |
1879 | |
1880 | if (arg & TUN_F_CSUM) { | |
88255375 | 1881 | features |= NETIF_F_HW_CSUM; |
5228ddc9 RR |
1882 | arg &= ~TUN_F_CSUM; |
1883 | ||
1884 | if (arg & (TUN_F_TSO4|TUN_F_TSO6)) { | |
1885 | if (arg & TUN_F_TSO_ECN) { | |
1886 | features |= NETIF_F_TSO_ECN; | |
1887 | arg &= ~TUN_F_TSO_ECN; | |
1888 | } | |
1889 | if (arg & TUN_F_TSO4) | |
1890 | features |= NETIF_F_TSO; | |
1891 | if (arg & TUN_F_TSO6) | |
1892 | features |= NETIF_F_TSO6; | |
1893 | arg &= ~(TUN_F_TSO4|TUN_F_TSO6); | |
1894 | } | |
e3e3c423 VY |
1895 | |
1896 | if (arg & TUN_F_UFO) { | |
1897 | features |= NETIF_F_UFO; | |
1898 | arg &= ~TUN_F_UFO; | |
1899 | } | |
5228ddc9 RR |
1900 | } |
1901 | ||
1902 | /* This gives the user a way to test for new features in future by | |
1903 | * trying to set them. */ | |
1904 | if (arg) | |
1905 | return -EINVAL; | |
1906 | ||
88255375 MM |
1907 | tun->set_features = features; |
1908 | netdev_update_features(tun->dev); | |
5228ddc9 RR |
1909 | |
1910 | return 0; | |
1911 | } | |
1912 | ||
c8d68e6b JW |
1913 | static void tun_detach_filter(struct tun_struct *tun, int n) |
1914 | { | |
1915 | int i; | |
1916 | struct tun_file *tfile; | |
1917 | ||
1918 | for (i = 0; i < n; i++) { | |
b8deabd3 | 1919 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
1920 | lock_sock(tfile->socket.sk); |
1921 | sk_detach_filter(tfile->socket.sk); | |
1922 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
1923 | } |
1924 | ||
1925 | tun->filter_attached = false; | |
1926 | } | |
1927 | ||
1928 | static int tun_attach_filter(struct tun_struct *tun) | |
1929 | { | |
1930 | int i, ret = 0; | |
1931 | struct tun_file *tfile; | |
1932 | ||
1933 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1934 | tfile = rtnl_dereference(tun->tfiles[i]); |
8ced425e HFS |
1935 | lock_sock(tfile->socket.sk); |
1936 | ret = sk_attach_filter(&tun->fprog, tfile->socket.sk); | |
1937 | release_sock(tfile->socket.sk); | |
c8d68e6b JW |
1938 | if (ret) { |
1939 | tun_detach_filter(tun, i); | |
1940 | return ret; | |
1941 | } | |
1942 | } | |
1943 | ||
1944 | tun->filter_attached = true; | |
1945 | return ret; | |
1946 | } | |
1947 | ||
1948 | static void tun_set_sndbuf(struct tun_struct *tun) | |
1949 | { | |
1950 | struct tun_file *tfile; | |
1951 | int i; | |
1952 | ||
1953 | for (i = 0; i < tun->numqueues; i++) { | |
b8deabd3 | 1954 | tfile = rtnl_dereference(tun->tfiles[i]); |
c8d68e6b JW |
1955 | tfile->socket.sk->sk_sndbuf = tun->sndbuf; |
1956 | } | |
1957 | } | |
1958 | ||
cde8b15f JW |
1959 | static int tun_set_queue(struct file *file, struct ifreq *ifr) |
1960 | { | |
1961 | struct tun_file *tfile = file->private_data; | |
1962 | struct tun_struct *tun; | |
cde8b15f JW |
1963 | int ret = 0; |
1964 | ||
1965 | rtnl_lock(); | |
1966 | ||
1967 | if (ifr->ifr_flags & IFF_ATTACH_QUEUE) { | |
4008e97f | 1968 | tun = tfile->detached; |
5dbbaf2d | 1969 | if (!tun) { |
cde8b15f | 1970 | ret = -EINVAL; |
5dbbaf2d PM |
1971 | goto unlock; |
1972 | } | |
1973 | ret = security_tun_dev_attach_queue(tun->security); | |
1974 | if (ret < 0) | |
1975 | goto unlock; | |
849c9b6f | 1976 | ret = tun_attach(tun, file, false); |
4008e97f | 1977 | } else if (ifr->ifr_flags & IFF_DETACH_QUEUE) { |
b8deabd3 | 1978 | tun = rtnl_dereference(tfile->tun); |
40630b82 | 1979 | if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached) |
4008e97f JW |
1980 | ret = -EINVAL; |
1981 | else | |
1982 | __tun_detach(tfile, false); | |
1983 | } else | |
cde8b15f JW |
1984 | ret = -EINVAL; |
1985 | ||
5dbbaf2d | 1986 | unlock: |
cde8b15f JW |
1987 | rtnl_unlock(); |
1988 | return ret; | |
1989 | } | |
1990 | ||
50857e2a AB |
1991 | static long __tun_chr_ioctl(struct file *file, unsigned int cmd, |
1992 | unsigned long arg, int ifreq_len) | |
1da177e4 | 1993 | { |
36b50bab | 1994 | struct tun_file *tfile = file->private_data; |
631ab46b | 1995 | struct tun_struct *tun; |
1da177e4 LT |
1996 | void __user* argp = (void __user*)arg; |
1997 | struct ifreq ifr; | |
0625c883 EB |
1998 | kuid_t owner; |
1999 | kgid_t group; | |
33dccbb0 | 2000 | int sndbuf; |
d9d52b51 | 2001 | int vnet_hdr_sz; |
fb7589a1 | 2002 | unsigned int ifindex; |
1cf8e410 | 2003 | int le; |
f271b2cc | 2004 | int ret; |
1da177e4 | 2005 | |
cde8b15f | 2006 | if (cmd == TUNSETIFF || cmd == TUNSETQUEUE || _IOC_TYPE(cmd) == 0x89) { |
50857e2a | 2007 | if (copy_from_user(&ifr, argp, ifreq_len)) |
1da177e4 | 2008 | return -EFAULT; |
8bbb1813 | 2009 | } else { |
a117dacd | 2010 | memset(&ifr, 0, sizeof(ifr)); |
8bbb1813 | 2011 | } |
631ab46b EB |
2012 | if (cmd == TUNGETFEATURES) { |
2013 | /* Currently this just means: "what IFF flags are valid?". | |
2014 | * This is needed because we never checked for invalid flags on | |
031f5e03 MT |
2015 | * TUNSETIFF. |
2016 | */ | |
2017 | return put_user(IFF_TUN | IFF_TAP | TUN_FEATURES, | |
631ab46b | 2018 | (unsigned int __user*)argp); |
cde8b15f JW |
2019 | } else if (cmd == TUNSETQUEUE) |
2020 | return tun_set_queue(file, &ifr); | |
631ab46b | 2021 | |
c8d68e6b | 2022 | ret = 0; |
876bfd4d HX |
2023 | rtnl_lock(); |
2024 | ||
36b50bab | 2025 | tun = __tun_get(tfile); |
1da177e4 | 2026 | if (cmd == TUNSETIFF && !tun) { |
1da177e4 LT |
2027 | ifr.ifr_name[IFNAMSIZ-1] = '\0'; |
2028 | ||
140e807d | 2029 | ret = tun_set_iff(sock_net(&tfile->sk), file, &ifr); |
1da177e4 | 2030 | |
876bfd4d HX |
2031 | if (ret) |
2032 | goto unlock; | |
1da177e4 | 2033 | |
50857e2a | 2034 | if (copy_to_user(argp, &ifr, ifreq_len)) |
876bfd4d HX |
2035 | ret = -EFAULT; |
2036 | goto unlock; | |
1da177e4 | 2037 | } |
fb7589a1 PE |
2038 | if (cmd == TUNSETIFINDEX) { |
2039 | ret = -EPERM; | |
2040 | if (tun) | |
2041 | goto unlock; | |
2042 | ||
2043 | ret = -EFAULT; | |
2044 | if (copy_from_user(&ifindex, argp, sizeof(ifindex))) | |
2045 | goto unlock; | |
2046 | ||
2047 | ret = 0; | |
2048 | tfile->ifindex = ifindex; | |
2049 | goto unlock; | |
2050 | } | |
1da177e4 | 2051 | |
876bfd4d | 2052 | ret = -EBADFD; |
1da177e4 | 2053 | if (!tun) |
876bfd4d | 2054 | goto unlock; |
1da177e4 | 2055 | |
1e588338 | 2056 | tun_debug(KERN_INFO, tun, "tun_chr_ioctl cmd %u\n", cmd); |
1da177e4 | 2057 | |
631ab46b | 2058 | ret = 0; |
1da177e4 | 2059 | switch (cmd) { |
e3b99556 | 2060 | case TUNGETIFF: |
9ce99cf6 | 2061 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); |
e3b99556 | 2062 | |
3d407a80 PE |
2063 | if (tfile->detached) |
2064 | ifr.ifr_flags |= IFF_DETACH_QUEUE; | |
849c9b6f PE |
2065 | if (!tfile->socket.sk->sk_filter) |
2066 | ifr.ifr_flags |= IFF_NOFILTER; | |
3d407a80 | 2067 | |
50857e2a | 2068 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b | 2069 | ret = -EFAULT; |
e3b99556 MM |
2070 | break; |
2071 | ||
1da177e4 LT |
2072 | case TUNSETNOCSUM: |
2073 | /* Disable/Enable checksum */ | |
1da177e4 | 2074 | |
88255375 MM |
2075 | /* [unimplemented] */ |
2076 | tun_debug(KERN_INFO, tun, "ignored: set checksum %s\n", | |
6b8a66ee | 2077 | arg ? "disabled" : "enabled"); |
1da177e4 LT |
2078 | break; |
2079 | ||
2080 | case TUNSETPERSIST: | |
54f968d6 JW |
2081 | /* Disable/Enable persist mode. Keep an extra reference to the |
2082 | * module to prevent the module being unprobed. | |
2083 | */ | |
40630b82 MT |
2084 | if (arg && !(tun->flags & IFF_PERSIST)) { |
2085 | tun->flags |= IFF_PERSIST; | |
54f968d6 | 2086 | __module_get(THIS_MODULE); |
dd38bd85 | 2087 | } |
40630b82 MT |
2088 | if (!arg && (tun->flags & IFF_PERSIST)) { |
2089 | tun->flags &= ~IFF_PERSIST; | |
54f968d6 JW |
2090 | module_put(THIS_MODULE); |
2091 | } | |
1da177e4 | 2092 | |
6b8a66ee JP |
2093 | tun_debug(KERN_INFO, tun, "persist %s\n", |
2094 | arg ? "enabled" : "disabled"); | |
1da177e4 LT |
2095 | break; |
2096 | ||
2097 | case TUNSETOWNER: | |
2098 | /* Set owner of the device */ | |
0625c883 EB |
2099 | owner = make_kuid(current_user_ns(), arg); |
2100 | if (!uid_valid(owner)) { | |
2101 | ret = -EINVAL; | |
2102 | break; | |
2103 | } | |
2104 | tun->owner = owner; | |
1e588338 | 2105 | tun_debug(KERN_INFO, tun, "owner set to %u\n", |
0625c883 | 2106 | from_kuid(&init_user_ns, tun->owner)); |
1da177e4 LT |
2107 | break; |
2108 | ||
8c644623 GG |
2109 | case TUNSETGROUP: |
2110 | /* Set group of the device */ | |
0625c883 EB |
2111 | group = make_kgid(current_user_ns(), arg); |
2112 | if (!gid_valid(group)) { | |
2113 | ret = -EINVAL; | |
2114 | break; | |
2115 | } | |
2116 | tun->group = group; | |
1e588338 | 2117 | tun_debug(KERN_INFO, tun, "group set to %u\n", |
0625c883 | 2118 | from_kgid(&init_user_ns, tun->group)); |
8c644623 GG |
2119 | break; |
2120 | ||
ff4cc3ac MK |
2121 | case TUNSETLINK: |
2122 | /* Only allow setting the type when the interface is down */ | |
2123 | if (tun->dev->flags & IFF_UP) { | |
6b8a66ee JP |
2124 | tun_debug(KERN_INFO, tun, |
2125 | "Linktype set failed because interface is up\n"); | |
48abfe05 | 2126 | ret = -EBUSY; |
ff4cc3ac MK |
2127 | } else { |
2128 | tun->dev->type = (int) arg; | |
6b8a66ee JP |
2129 | tun_debug(KERN_INFO, tun, "linktype set to %d\n", |
2130 | tun->dev->type); | |
48abfe05 | 2131 | ret = 0; |
ff4cc3ac | 2132 | } |
631ab46b | 2133 | break; |
ff4cc3ac | 2134 | |
1da177e4 LT |
2135 | #ifdef TUN_DEBUG |
2136 | case TUNSETDEBUG: | |
2137 | tun->debug = arg; | |
2138 | break; | |
2139 | #endif | |
5228ddc9 | 2140 | case TUNSETOFFLOAD: |
88255375 | 2141 | ret = set_offload(tun, arg); |
631ab46b | 2142 | break; |
5228ddc9 | 2143 | |
f271b2cc MK |
2144 | case TUNSETTXFILTER: |
2145 | /* Can be set only for TAPs */ | |
631ab46b | 2146 | ret = -EINVAL; |
40630b82 | 2147 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
631ab46b | 2148 | break; |
c0e5a8c2 | 2149 | ret = update_filter(&tun->txflt, (void __user *)arg); |
631ab46b | 2150 | break; |
1da177e4 LT |
2151 | |
2152 | case SIOCGIFHWADDR: | |
b595076a | 2153 | /* Get hw address */ |
f271b2cc MK |
2154 | memcpy(ifr.ifr_hwaddr.sa_data, tun->dev->dev_addr, ETH_ALEN); |
2155 | ifr.ifr_hwaddr.sa_family = tun->dev->type; | |
50857e2a | 2156 | if (copy_to_user(argp, &ifr, ifreq_len)) |
631ab46b EB |
2157 | ret = -EFAULT; |
2158 | break; | |
1da177e4 LT |
2159 | |
2160 | case SIOCSIFHWADDR: | |
f271b2cc | 2161 | /* Set hw address */ |
6b8a66ee JP |
2162 | tun_debug(KERN_DEBUG, tun, "set hw address: %pM\n", |
2163 | ifr.ifr_hwaddr.sa_data); | |
40102371 | 2164 | |
40102371 | 2165 | ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr); |
631ab46b | 2166 | break; |
33dccbb0 HX |
2167 | |
2168 | case TUNGETSNDBUF: | |
54f968d6 | 2169 | sndbuf = tfile->socket.sk->sk_sndbuf; |
33dccbb0 HX |
2170 | if (copy_to_user(argp, &sndbuf, sizeof(sndbuf))) |
2171 | ret = -EFAULT; | |
2172 | break; | |
2173 | ||
2174 | case TUNSETSNDBUF: | |
2175 | if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) { | |
2176 | ret = -EFAULT; | |
2177 | break; | |
2178 | } | |
2179 | ||
c8d68e6b JW |
2180 | tun->sndbuf = sndbuf; |
2181 | tun_set_sndbuf(tun); | |
33dccbb0 HX |
2182 | break; |
2183 | ||
d9d52b51 MT |
2184 | case TUNGETVNETHDRSZ: |
2185 | vnet_hdr_sz = tun->vnet_hdr_sz; | |
2186 | if (copy_to_user(argp, &vnet_hdr_sz, sizeof(vnet_hdr_sz))) | |
2187 | ret = -EFAULT; | |
2188 | break; | |
2189 | ||
2190 | case TUNSETVNETHDRSZ: | |
2191 | if (copy_from_user(&vnet_hdr_sz, argp, sizeof(vnet_hdr_sz))) { | |
2192 | ret = -EFAULT; | |
2193 | break; | |
2194 | } | |
2195 | if (vnet_hdr_sz < (int)sizeof(struct virtio_net_hdr)) { | |
2196 | ret = -EINVAL; | |
2197 | break; | |
2198 | } | |
2199 | ||
2200 | tun->vnet_hdr_sz = vnet_hdr_sz; | |
2201 | break; | |
2202 | ||
1cf8e410 MT |
2203 | case TUNGETVNETLE: |
2204 | le = !!(tun->flags & TUN_VNET_LE); | |
2205 | if (put_user(le, (int __user *)argp)) | |
2206 | ret = -EFAULT; | |
2207 | break; | |
2208 | ||
2209 | case TUNSETVNETLE: | |
2210 | if (get_user(le, (int __user *)argp)) { | |
2211 | ret = -EFAULT; | |
2212 | break; | |
2213 | } | |
2214 | if (le) | |
2215 | tun->flags |= TUN_VNET_LE; | |
2216 | else | |
2217 | tun->flags &= ~TUN_VNET_LE; | |
2218 | break; | |
2219 | ||
8b8e658b GK |
2220 | case TUNGETVNETBE: |
2221 | ret = tun_get_vnet_be(tun, argp); | |
2222 | break; | |
2223 | ||
2224 | case TUNSETVNETBE: | |
2225 | ret = tun_set_vnet_be(tun, argp); | |
2226 | break; | |
2227 | ||
99405162 MT |
2228 | case TUNATTACHFILTER: |
2229 | /* Can be set only for TAPs */ | |
2230 | ret = -EINVAL; | |
40630b82 | 2231 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 MT |
2232 | break; |
2233 | ret = -EFAULT; | |
54f968d6 | 2234 | if (copy_from_user(&tun->fprog, argp, sizeof(tun->fprog))) |
99405162 MT |
2235 | break; |
2236 | ||
c8d68e6b | 2237 | ret = tun_attach_filter(tun); |
99405162 MT |
2238 | break; |
2239 | ||
2240 | case TUNDETACHFILTER: | |
2241 | /* Can be set only for TAPs */ | |
2242 | ret = -EINVAL; | |
40630b82 | 2243 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
99405162 | 2244 | break; |
c8d68e6b JW |
2245 | ret = 0; |
2246 | tun_detach_filter(tun, tun->numqueues); | |
99405162 MT |
2247 | break; |
2248 | ||
76975e9c PE |
2249 | case TUNGETFILTER: |
2250 | ret = -EINVAL; | |
40630b82 | 2251 | if ((tun->flags & TUN_TYPE_MASK) != IFF_TAP) |
76975e9c PE |
2252 | break; |
2253 | ret = -EFAULT; | |
2254 | if (copy_to_user(argp, &tun->fprog, sizeof(tun->fprog))) | |
2255 | break; | |
2256 | ret = 0; | |
2257 | break; | |
2258 | ||
1da177e4 | 2259 | default: |
631ab46b EB |
2260 | ret = -EINVAL; |
2261 | break; | |
ee289b64 | 2262 | } |
1da177e4 | 2263 | |
876bfd4d HX |
2264 | unlock: |
2265 | rtnl_unlock(); | |
2266 | if (tun) | |
2267 | tun_put(tun); | |
631ab46b | 2268 | return ret; |
1da177e4 LT |
2269 | } |
2270 | ||
50857e2a AB |
2271 | static long tun_chr_ioctl(struct file *file, |
2272 | unsigned int cmd, unsigned long arg) | |
2273 | { | |
2274 | return __tun_chr_ioctl(file, cmd, arg, sizeof (struct ifreq)); | |
2275 | } | |
2276 | ||
2277 | #ifdef CONFIG_COMPAT | |
2278 | static long tun_chr_compat_ioctl(struct file *file, | |
2279 | unsigned int cmd, unsigned long arg) | |
2280 | { | |
2281 | switch (cmd) { | |
2282 | case TUNSETIFF: | |
2283 | case TUNGETIFF: | |
2284 | case TUNSETTXFILTER: | |
2285 | case TUNGETSNDBUF: | |
2286 | case TUNSETSNDBUF: | |
2287 | case SIOCGIFHWADDR: | |
2288 | case SIOCSIFHWADDR: | |
2289 | arg = (unsigned long)compat_ptr(arg); | |
2290 | break; | |
2291 | default: | |
2292 | arg = (compat_ulong_t)arg; | |
2293 | break; | |
2294 | } | |
2295 | ||
2296 | /* | |
2297 | * compat_ifreq is shorter than ifreq, so we must not access beyond | |
2298 | * the end of that structure. All fields that are used in this | |
2299 | * driver are compatible though, we don't need to convert the | |
2300 | * contents. | |
2301 | */ | |
2302 | return __tun_chr_ioctl(file, cmd, arg, sizeof(struct compat_ifreq)); | |
2303 | } | |
2304 | #endif /* CONFIG_COMPAT */ | |
2305 | ||
1da177e4 LT |
2306 | static int tun_chr_fasync(int fd, struct file *file, int on) |
2307 | { | |
54f968d6 | 2308 | struct tun_file *tfile = file->private_data; |
1da177e4 LT |
2309 | int ret; |
2310 | ||
54f968d6 | 2311 | if ((ret = fasync_helper(fd, file, on, &tfile->fasync)) < 0) |
9d319522 | 2312 | goto out; |
6aa20a22 | 2313 | |
1da177e4 | 2314 | if (on) { |
e0b93edd | 2315 | __f_setown(file, task_pid(current), PIDTYPE_PID, 0); |
54f968d6 | 2316 | tfile->flags |= TUN_FASYNC; |
6aa20a22 | 2317 | } else |
54f968d6 | 2318 | tfile->flags &= ~TUN_FASYNC; |
9d319522 JC |
2319 | ret = 0; |
2320 | out: | |
9d319522 | 2321 | return ret; |
1da177e4 LT |
2322 | } |
2323 | ||
2324 | static int tun_chr_open(struct inode *inode, struct file * file) | |
2325 | { | |
140e807d | 2326 | struct net *net = current->nsproxy->net_ns; |
631ab46b | 2327 | struct tun_file *tfile; |
deed49fb | 2328 | |
6b8a66ee | 2329 | DBG1(KERN_INFO, "tunX: tun_chr_open\n"); |
631ab46b | 2330 | |
140e807d | 2331 | tfile = (struct tun_file *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL, |
11aa9c28 | 2332 | &tun_proto, 0); |
631ab46b EB |
2333 | if (!tfile) |
2334 | return -ENOMEM; | |
c956674b | 2335 | RCU_INIT_POINTER(tfile->tun, NULL); |
54f968d6 | 2336 | tfile->flags = 0; |
fb7589a1 | 2337 | tfile->ifindex = 0; |
54f968d6 | 2338 | |
54f968d6 | 2339 | init_waitqueue_head(&tfile->wq.wait); |
9e641bdc | 2340 | RCU_INIT_POINTER(tfile->socket.wq, &tfile->wq); |
54f968d6 JW |
2341 | |
2342 | tfile->socket.file = file; | |
2343 | tfile->socket.ops = &tun_socket_ops; | |
2344 | ||
2345 | sock_init_data(&tfile->socket, &tfile->sk); | |
54f968d6 JW |
2346 | |
2347 | tfile->sk.sk_write_space = tun_sock_write_space; | |
2348 | tfile->sk.sk_sndbuf = INT_MAX; | |
2349 | ||
631ab46b | 2350 | file->private_data = tfile; |
4008e97f | 2351 | INIT_LIST_HEAD(&tfile->next); |
54f968d6 | 2352 | |
19a6afb2 JW |
2353 | sock_set_flag(&tfile->sk, SOCK_ZEROCOPY); |
2354 | ||
1da177e4 LT |
2355 | return 0; |
2356 | } | |
2357 | ||
2358 | static int tun_chr_close(struct inode *inode, struct file *file) | |
2359 | { | |
631ab46b | 2360 | struct tun_file *tfile = file->private_data; |
1da177e4 | 2361 | |
c8d68e6b | 2362 | tun_detach(tfile, true); |
1da177e4 LT |
2363 | |
2364 | return 0; | |
2365 | } | |
2366 | ||
93e14b6d | 2367 | #ifdef CONFIG_PROC_FS |
a3816ab0 | 2368 | static void tun_chr_show_fdinfo(struct seq_file *m, struct file *f) |
93e14b6d MY |
2369 | { |
2370 | struct tun_struct *tun; | |
2371 | struct ifreq ifr; | |
2372 | ||
2373 | memset(&ifr, 0, sizeof(ifr)); | |
2374 | ||
2375 | rtnl_lock(); | |
2376 | tun = tun_get(f); | |
2377 | if (tun) | |
2378 | tun_get_iff(current->nsproxy->net_ns, tun, &ifr); | |
2379 | rtnl_unlock(); | |
2380 | ||
2381 | if (tun) | |
2382 | tun_put(tun); | |
2383 | ||
a3816ab0 | 2384 | seq_printf(m, "iff:\t%s\n", ifr.ifr_name); |
93e14b6d MY |
2385 | } |
2386 | #endif | |
2387 | ||
d54b1fdb | 2388 | static const struct file_operations tun_fops = { |
6aa20a22 | 2389 | .owner = THIS_MODULE, |
1da177e4 | 2390 | .llseek = no_llseek, |
9b067034 | 2391 | .read_iter = tun_chr_read_iter, |
f5ff53b4 | 2392 | .write_iter = tun_chr_write_iter, |
1da177e4 | 2393 | .poll = tun_chr_poll, |
50857e2a AB |
2394 | .unlocked_ioctl = tun_chr_ioctl, |
2395 | #ifdef CONFIG_COMPAT | |
2396 | .compat_ioctl = tun_chr_compat_ioctl, | |
2397 | #endif | |
1da177e4 LT |
2398 | .open = tun_chr_open, |
2399 | .release = tun_chr_close, | |
93e14b6d MY |
2400 | .fasync = tun_chr_fasync, |
2401 | #ifdef CONFIG_PROC_FS | |
2402 | .show_fdinfo = tun_chr_show_fdinfo, | |
2403 | #endif | |
1da177e4 LT |
2404 | }; |
2405 | ||
2406 | static struct miscdevice tun_miscdev = { | |
2407 | .minor = TUN_MINOR, | |
2408 | .name = "tun", | |
e454cea2 | 2409 | .nodename = "net/tun", |
1da177e4 | 2410 | .fops = &tun_fops, |
1da177e4 LT |
2411 | }; |
2412 | ||
2413 | /* ethtool interface */ | |
2414 | ||
2415 | static int tun_get_settings(struct net_device *dev, struct ethtool_cmd *cmd) | |
2416 | { | |
2417 | cmd->supported = 0; | |
2418 | cmd->advertising = 0; | |
70739497 | 2419 | ethtool_cmd_speed_set(cmd, SPEED_10); |
1da177e4 LT |
2420 | cmd->duplex = DUPLEX_FULL; |
2421 | cmd->port = PORT_TP; | |
2422 | cmd->phy_address = 0; | |
2423 | cmd->transceiver = XCVR_INTERNAL; | |
2424 | cmd->autoneg = AUTONEG_DISABLE; | |
2425 | cmd->maxtxpkt = 0; | |
2426 | cmd->maxrxpkt = 0; | |
2427 | return 0; | |
2428 | } | |
2429 | ||
2430 | static void tun_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) | |
2431 | { | |
2432 | struct tun_struct *tun = netdev_priv(dev); | |
2433 | ||
33a5ba14 RJ |
2434 | strlcpy(info->driver, DRV_NAME, sizeof(info->driver)); |
2435 | strlcpy(info->version, DRV_VERSION, sizeof(info->version)); | |
1da177e4 LT |
2436 | |
2437 | switch (tun->flags & TUN_TYPE_MASK) { | |
40630b82 | 2438 | case IFF_TUN: |
33a5ba14 | 2439 | strlcpy(info->bus_info, "tun", sizeof(info->bus_info)); |
1da177e4 | 2440 | break; |
40630b82 | 2441 | case IFF_TAP: |
33a5ba14 | 2442 | strlcpy(info->bus_info, "tap", sizeof(info->bus_info)); |
1da177e4 LT |
2443 | break; |
2444 | } | |
2445 | } | |
2446 | ||
2447 | static u32 tun_get_msglevel(struct net_device *dev) | |
2448 | { | |
2449 | #ifdef TUN_DEBUG | |
2450 | struct tun_struct *tun = netdev_priv(dev); | |
2451 | return tun->debug; | |
2452 | #else | |
2453 | return -EOPNOTSUPP; | |
2454 | #endif | |
2455 | } | |
2456 | ||
2457 | static void tun_set_msglevel(struct net_device *dev, u32 value) | |
2458 | { | |
2459 | #ifdef TUN_DEBUG | |
2460 | struct tun_struct *tun = netdev_priv(dev); | |
2461 | tun->debug = value; | |
2462 | #endif | |
2463 | } | |
2464 | ||
7282d491 | 2465 | static const struct ethtool_ops tun_ethtool_ops = { |
1da177e4 LT |
2466 | .get_settings = tun_get_settings, |
2467 | .get_drvinfo = tun_get_drvinfo, | |
2468 | .get_msglevel = tun_get_msglevel, | |
2469 | .set_msglevel = tun_set_msglevel, | |
bee31369 | 2470 | .get_link = ethtool_op_get_link, |
eda29772 | 2471 | .get_ts_info = ethtool_op_get_ts_info, |
1da177e4 LT |
2472 | }; |
2473 | ||
1576d986 JW |
2474 | static int tun_queue_resize(struct tun_struct *tun) |
2475 | { | |
2476 | struct net_device *dev = tun->dev; | |
2477 | struct tun_file *tfile; | |
2478 | struct skb_array **arrays; | |
2479 | int n = tun->numqueues + tun->numdisabled; | |
2480 | int ret, i; | |
2481 | ||
2482 | arrays = kmalloc(sizeof *arrays * n, GFP_KERNEL); | |
2483 | if (!arrays) | |
2484 | return -ENOMEM; | |
2485 | ||
2486 | for (i = 0; i < tun->numqueues; i++) { | |
2487 | tfile = rtnl_dereference(tun->tfiles[i]); | |
2488 | arrays[i] = &tfile->tx_array; | |
2489 | } | |
2490 | list_for_each_entry(tfile, &tun->disabled, next) | |
2491 | arrays[i++] = &tfile->tx_array; | |
2492 | ||
2493 | ret = skb_array_resize_multiple(arrays, n, | |
2494 | dev->tx_queue_len, GFP_KERNEL); | |
2495 | ||
2496 | kfree(arrays); | |
2497 | return ret; | |
2498 | } | |
2499 | ||
2500 | static int tun_device_event(struct notifier_block *unused, | |
2501 | unsigned long event, void *ptr) | |
2502 | { | |
2503 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
2504 | struct tun_struct *tun = netdev_priv(dev); | |
2505 | ||
86dfb4ac CG |
2506 | if (dev->rtnl_link_ops != &tun_link_ops) |
2507 | return NOTIFY_DONE; | |
2508 | ||
1576d986 JW |
2509 | switch (event) { |
2510 | case NETDEV_CHANGE_TX_QUEUE_LEN: | |
2511 | if (tun_queue_resize(tun)) | |
2512 | return NOTIFY_BAD; | |
2513 | break; | |
2514 | default: | |
2515 | break; | |
2516 | } | |
2517 | ||
2518 | return NOTIFY_DONE; | |
2519 | } | |
2520 | ||
2521 | static struct notifier_block tun_notifier_block __read_mostly = { | |
2522 | .notifier_call = tun_device_event, | |
2523 | }; | |
79d17604 | 2524 | |
1da177e4 LT |
2525 | static int __init tun_init(void) |
2526 | { | |
2527 | int ret = 0; | |
2528 | ||
6b8a66ee JP |
2529 | pr_info("%s, %s\n", DRV_DESCRIPTION, DRV_VERSION); |
2530 | pr_info("%s\n", DRV_COPYRIGHT); | |
1da177e4 | 2531 | |
f019a7a5 | 2532 | ret = rtnl_link_register(&tun_link_ops); |
79d17604 | 2533 | if (ret) { |
6b8a66ee | 2534 | pr_err("Can't register link_ops\n"); |
f019a7a5 | 2535 | goto err_linkops; |
79d17604 PE |
2536 | } |
2537 | ||
1da177e4 | 2538 | ret = misc_register(&tun_miscdev); |
79d17604 | 2539 | if (ret) { |
6b8a66ee | 2540 | pr_err("Can't register misc device %d\n", TUN_MINOR); |
79d17604 PE |
2541 | goto err_misc; |
2542 | } | |
1576d986 JW |
2543 | |
2544 | register_netdevice_notifier(&tun_notifier_block); | |
f019a7a5 | 2545 | return 0; |
79d17604 | 2546 | err_misc: |
f019a7a5 EB |
2547 | rtnl_link_unregister(&tun_link_ops); |
2548 | err_linkops: | |
1da177e4 LT |
2549 | return ret; |
2550 | } | |
2551 | ||
2552 | static void tun_cleanup(void) | |
2553 | { | |
6aa20a22 | 2554 | misc_deregister(&tun_miscdev); |
f019a7a5 | 2555 | rtnl_link_unregister(&tun_link_ops); |
1576d986 | 2556 | unregister_netdevice_notifier(&tun_notifier_block); |
1da177e4 LT |
2557 | } |
2558 | ||
05c2828c MT |
2559 | /* Get an underlying socket object from tun file. Returns error unless file is |
2560 | * attached to a device. The returned object works like a packet socket, it | |
2561 | * can be used for sock_sendmsg/sock_recvmsg. The caller is responsible for | |
2562 | * holding a reference to the file for as long as the socket is in use. */ | |
2563 | struct socket *tun_get_socket(struct file *file) | |
2564 | { | |
6e914fc7 | 2565 | struct tun_file *tfile; |
05c2828c MT |
2566 | if (file->f_op != &tun_fops) |
2567 | return ERR_PTR(-EINVAL); | |
6e914fc7 JW |
2568 | tfile = file->private_data; |
2569 | if (!tfile) | |
05c2828c | 2570 | return ERR_PTR(-EBADFD); |
54f968d6 | 2571 | return &tfile->socket; |
05c2828c MT |
2572 | } |
2573 | EXPORT_SYMBOL_GPL(tun_get_socket); | |
2574 | ||
1da177e4 LT |
2575 | module_init(tun_init); |
2576 | module_exit(tun_cleanup); | |
2577 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
2578 | MODULE_AUTHOR(DRV_COPYRIGHT); | |
2579 | MODULE_LICENSE("GPL"); | |
2580 | MODULE_ALIAS_MISCDEV(TUN_MINOR); | |
578454ff | 2581 | MODULE_ALIAS("devname:net/tun"); |